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1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
f72ffdd6 | 3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar |
1da177e4 LT |
4 | |
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
9d48739e N |
33 | |
34 | Errors, Warnings, etc. | |
35 | Please use: | |
36 | pr_crit() for error conditions that risk data loss | |
37 | pr_err() for error conditions that are unexpected, like an IO error | |
38 | or internal inconsistency | |
39 | pr_warn() for error conditions that could have been predicated, like | |
40 | adding a device to an array when it has incompatible metadata | |
41 | pr_info() for every interesting, very rare events, like an array starting | |
42 | or stopping, or resync starting or stopping | |
43 | pr_debug() for everything else. | |
44 | ||
1da177e4 LT |
45 | */ |
46 | ||
3f07c014 | 47 | #include <linux/sched/signal.h> |
a6fb0934 | 48 | #include <linux/kthread.h> |
bff61975 | 49 | #include <linux/blkdev.h> |
fc974ee2 | 50 | #include <linux/badblocks.h> |
1da177e4 | 51 | #include <linux/sysctl.h> |
bff61975 | 52 | #include <linux/seq_file.h> |
ff01bb48 | 53 | #include <linux/fs.h> |
d7603b7e | 54 | #include <linux/poll.h> |
16f17b39 | 55 | #include <linux/ctype.h> |
e7d2860b | 56 | #include <linux/string.h> |
fb4d8c76 N |
57 | #include <linux/hdreg.h> |
58 | #include <linux/proc_fs.h> | |
59 | #include <linux/random.h> | |
056075c7 | 60 | #include <linux/module.h> |
fb4d8c76 | 61 | #include <linux/reboot.h> |
32a7627c | 62 | #include <linux/file.h> |
aa98aa31 | 63 | #include <linux/compat.h> |
25570727 | 64 | #include <linux/delay.h> |
bff61975 N |
65 | #include <linux/raid/md_p.h> |
66 | #include <linux/raid/md_u.h> | |
5a0e3ad6 | 67 | #include <linux/slab.h> |
4ad23a97 N |
68 | #include <linux/percpu-refcount.h> |
69 | ||
504634f6 | 70 | #include <trace/events/block.h> |
43b2e5d8 | 71 | #include "md.h" |
935fe098 | 72 | #include "md-bitmap.h" |
edb39c9d | 73 | #include "md-cluster.h" |
1da177e4 | 74 | |
1da177e4 | 75 | #ifndef MODULE |
d710e138 | 76 | static void autostart_arrays(int part); |
1da177e4 LT |
77 | #endif |
78 | ||
01f96c0a N |
79 | /* pers_list is a list of registered personalities protected |
80 | * by pers_lock. | |
81 | * pers_lock does extra service to protect accesses to | |
82 | * mddev->thread when the mutex cannot be held. | |
83 | */ | |
2604b703 | 84 | static LIST_HEAD(pers_list); |
1da177e4 LT |
85 | static DEFINE_SPINLOCK(pers_lock); |
86 | ||
edb39c9d | 87 | struct md_cluster_operations *md_cluster_ops; |
589a1c49 | 88 | EXPORT_SYMBOL(md_cluster_ops); |
edb39c9d GR |
89 | struct module *md_cluster_mod; |
90 | EXPORT_SYMBOL(md_cluster_mod); | |
91 | ||
90b08710 | 92 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
e804ac78 TH |
93 | static struct workqueue_struct *md_wq; |
94 | static struct workqueue_struct *md_misc_wq; | |
90b08710 | 95 | |
746d3207 N |
96 | static int remove_and_add_spares(struct mddev *mddev, |
97 | struct md_rdev *this); | |
5aa61f42 | 98 | static void mddev_detach(struct mddev *mddev); |
746d3207 | 99 | |
1e50915f RB |
100 | /* |
101 | * Default number of read corrections we'll attempt on an rdev | |
102 | * before ejecting it from the array. We divide the read error | |
103 | * count by 2 for every hour elapsed between read errors. | |
104 | */ | |
105 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
106 | /* |
107 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
108 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
109 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 110 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
111 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
112 | * speed limit - in case reconstruction slows down your system despite | |
113 | * idle IO detection. | |
114 | * | |
115 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 116 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
117 | */ |
118 | ||
119 | static int sysctl_speed_limit_min = 1000; | |
120 | static int sysctl_speed_limit_max = 200000; | |
fd01b88c | 121 | static inline int speed_min(struct mddev *mddev) |
88202a0c N |
122 | { |
123 | return mddev->sync_speed_min ? | |
124 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
125 | } | |
126 | ||
fd01b88c | 127 | static inline int speed_max(struct mddev *mddev) |
88202a0c N |
128 | { |
129 | return mddev->sync_speed_max ? | |
130 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
131 | } | |
1da177e4 LT |
132 | |
133 | static struct ctl_table_header *raid_table_header; | |
134 | ||
82592c38 | 135 | static struct ctl_table raid_table[] = { |
1da177e4 | 136 | { |
1da177e4 LT |
137 | .procname = "speed_limit_min", |
138 | .data = &sysctl_speed_limit_min, | |
139 | .maxlen = sizeof(int), | |
80ca3a44 | 140 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 141 | .proc_handler = proc_dointvec, |
1da177e4 LT |
142 | }, |
143 | { | |
1da177e4 LT |
144 | .procname = "speed_limit_max", |
145 | .data = &sysctl_speed_limit_max, | |
146 | .maxlen = sizeof(int), | |
80ca3a44 | 147 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 148 | .proc_handler = proc_dointvec, |
1da177e4 | 149 | }, |
894d2491 | 150 | { } |
1da177e4 LT |
151 | }; |
152 | ||
82592c38 | 153 | static struct ctl_table raid_dir_table[] = { |
1da177e4 | 154 | { |
1da177e4 LT |
155 | .procname = "raid", |
156 | .maxlen = 0, | |
80ca3a44 | 157 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
158 | .child = raid_table, |
159 | }, | |
894d2491 | 160 | { } |
1da177e4 LT |
161 | }; |
162 | ||
82592c38 | 163 | static struct ctl_table raid_root_table[] = { |
1da177e4 | 164 | { |
1da177e4 LT |
165 | .procname = "dev", |
166 | .maxlen = 0, | |
167 | .mode = 0555, | |
168 | .child = raid_dir_table, | |
169 | }, | |
894d2491 | 170 | { } |
1da177e4 LT |
171 | }; |
172 | ||
83d5cde4 | 173 | static const struct block_device_operations md_fops; |
1da177e4 | 174 | |
f91de92e N |
175 | static int start_readonly; |
176 | ||
78b6350d N |
177 | /* |
178 | * The original mechanism for creating an md device is to create | |
179 | * a device node in /dev and to open it. This causes races with device-close. | |
180 | * The preferred method is to write to the "new_array" module parameter. | |
181 | * This can avoid races. | |
182 | * Setting create_on_open to false disables the original mechanism | |
183 | * so all the races disappear. | |
184 | */ | |
185 | static bool create_on_open = true; | |
186 | ||
a167f663 | 187 | /* bio_clone_mddev |
9b10f6a9 | 188 | * like bio_clone_bioset, but with a local bio set |
a167f663 N |
189 | */ |
190 | ||
a167f663 | 191 | struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, |
fd01b88c | 192 | struct mddev *mddev) |
a167f663 N |
193 | { |
194 | struct bio *b; | |
a167f663 N |
195 | |
196 | if (!mddev || !mddev->bio_set) | |
197 | return bio_alloc(gfp_mask, nr_iovecs); | |
198 | ||
395c72a7 | 199 | b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set); |
a167f663 N |
200 | if (!b) |
201 | return NULL; | |
a167f663 N |
202 | return b; |
203 | } | |
204 | EXPORT_SYMBOL_GPL(bio_alloc_mddev); | |
205 | ||
5a85071c N |
206 | static struct bio *md_bio_alloc_sync(struct mddev *mddev) |
207 | { | |
7f053a6a | 208 | if (!mddev || !mddev->sync_set) |
5a85071c N |
209 | return bio_alloc(GFP_NOIO, 1); |
210 | ||
211 | return bio_alloc_bioset(GFP_NOIO, 1, mddev->sync_set); | |
212 | } | |
213 | ||
d7603b7e N |
214 | /* |
215 | * We have a system wide 'event count' that is incremented | |
216 | * on any 'interesting' event, and readers of /proc/mdstat | |
217 | * can use 'poll' or 'select' to find out when the event | |
218 | * count increases. | |
219 | * | |
220 | * Events are: | |
221 | * start array, stop array, error, add device, remove device, | |
222 | * start build, activate spare | |
223 | */ | |
2989ddbd | 224 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 225 | static atomic_t md_event_count; |
fd01b88c | 226 | void md_new_event(struct mddev *mddev) |
d7603b7e N |
227 | { |
228 | atomic_inc(&md_event_count); | |
229 | wake_up(&md_event_waiters); | |
230 | } | |
29269553 | 231 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 232 | |
1da177e4 LT |
233 | /* |
234 | * Enables to iterate over all existing md arrays | |
235 | * all_mddevs_lock protects this list. | |
236 | */ | |
237 | static LIST_HEAD(all_mddevs); | |
238 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
239 | ||
1da177e4 LT |
240 | /* |
241 | * iterates through all used mddevs in the system. | |
242 | * We take care to grab the all_mddevs_lock whenever navigating | |
243 | * the list, and to always hold a refcount when unlocked. | |
244 | * Any code which breaks out of this loop while own | |
245 | * a reference to the current mddev and must mddev_put it. | |
246 | */ | |
fd01b88c | 247 | #define for_each_mddev(_mddev,_tmp) \ |
1da177e4 | 248 | \ |
f72ffdd6 | 249 | for (({ spin_lock(&all_mddevs_lock); \ |
fd01b88c N |
250 | _tmp = all_mddevs.next; \ |
251 | _mddev = NULL;}); \ | |
252 | ({ if (_tmp != &all_mddevs) \ | |
253 | mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ | |
1da177e4 | 254 | spin_unlock(&all_mddevs_lock); \ |
fd01b88c N |
255 | if (_mddev) mddev_put(_mddev); \ |
256 | _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ | |
257 | _tmp != &all_mddevs;}); \ | |
1da177e4 | 258 | ({ spin_lock(&all_mddevs_lock); \ |
fd01b88c | 259 | _tmp = _tmp->next;}) \ |
1da177e4 LT |
260 | ) |
261 | ||
409c57f3 N |
262 | /* Rather than calling directly into the personality make_request function, |
263 | * IO requests come here first so that we can check if the device is | |
264 | * being suspended pending a reconfiguration. | |
265 | * We hold a refcount over the call to ->make_request. By the time that | |
266 | * call has finished, the bio has been linked into some internal structure | |
267 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
268 | */ | |
b3143b9a N |
269 | static bool is_suspended(struct mddev *mddev, struct bio *bio) |
270 | { | |
271 | if (mddev->suspended) | |
272 | return true; | |
273 | if (bio_data_dir(bio) != WRITE) | |
274 | return false; | |
275 | if (mddev->suspend_lo >= mddev->suspend_hi) | |
276 | return false; | |
277 | if (bio->bi_iter.bi_sector >= mddev->suspend_hi) | |
278 | return false; | |
279 | if (bio_end_sector(bio) < mddev->suspend_lo) | |
280 | return false; | |
281 | return true; | |
282 | } | |
283 | ||
393debc2 SL |
284 | void md_handle_request(struct mddev *mddev, struct bio *bio) |
285 | { | |
286 | check_suspended: | |
287 | rcu_read_lock(); | |
b3143b9a | 288 | if (is_suspended(mddev, bio)) { |
393debc2 SL |
289 | DEFINE_WAIT(__wait); |
290 | for (;;) { | |
291 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
292 | TASK_UNINTERRUPTIBLE); | |
b3143b9a | 293 | if (!is_suspended(mddev, bio)) |
393debc2 SL |
294 | break; |
295 | rcu_read_unlock(); | |
296 | schedule(); | |
297 | rcu_read_lock(); | |
298 | } | |
299 | finish_wait(&mddev->sb_wait, &__wait); | |
300 | } | |
301 | atomic_inc(&mddev->active_io); | |
302 | rcu_read_unlock(); | |
303 | ||
304 | if (!mddev->pers->make_request(mddev, bio)) { | |
305 | atomic_dec(&mddev->active_io); | |
306 | wake_up(&mddev->sb_wait); | |
307 | goto check_suspended; | |
308 | } | |
309 | ||
310 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) | |
311 | wake_up(&mddev->sb_wait); | |
312 | } | |
313 | EXPORT_SYMBOL(md_handle_request); | |
314 | ||
dece1635 | 315 | static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 | 316 | { |
49077326 | 317 | const int rw = bio_data_dir(bio); |
fd01b88c | 318 | struct mddev *mddev = q->queuedata; |
e91ece55 | 319 | unsigned int sectors; |
74672d06 | 320 | int cpu; |
49077326 | 321 | |
af67c31f | 322 | blk_queue_split(q, &bio); |
54efd50b | 323 | |
274d8cbd | 324 | if (mddev == NULL || mddev->pers == NULL) { |
409c57f3 | 325 | bio_io_error(bio); |
dece1635 | 326 | return BLK_QC_T_NONE; |
409c57f3 | 327 | } |
bbfa57c0 | 328 | if (mddev->ro == 1 && unlikely(rw == WRITE)) { |
4246a0b6 | 329 | if (bio_sectors(bio) != 0) |
4e4cbee9 | 330 | bio->bi_status = BLK_STS_IOERR; |
4246a0b6 | 331 | bio_endio(bio); |
dece1635 | 332 | return BLK_QC_T_NONE; |
bbfa57c0 | 333 | } |
49077326 | 334 | |
e91ece55 CM |
335 | /* |
336 | * save the sectors now since our bio can | |
337 | * go away inside make_request | |
338 | */ | |
339 | sectors = bio_sectors(bio); | |
9c573de3 | 340 | /* bio could be mergeable after passing to underlayer */ |
1eff9d32 | 341 | bio->bi_opf &= ~REQ_NOMERGE; |
393debc2 SL |
342 | |
343 | md_handle_request(mddev, bio); | |
49077326 | 344 | |
74672d06 GZ |
345 | cpu = part_stat_lock(); |
346 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); | |
347 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors); | |
348 | part_stat_unlock(); | |
49077326 | 349 | |
dece1635 | 350 | return BLK_QC_T_NONE; |
409c57f3 N |
351 | } |
352 | ||
9e35b99c N |
353 | /* mddev_suspend makes sure no new requests are submitted |
354 | * to the device, and that any requests that have been submitted | |
355 | * are completely handled. | |
afa0f557 N |
356 | * Once mddev_detach() is called and completes, the module will be |
357 | * completely unused. | |
9e35b99c | 358 | */ |
fd01b88c | 359 | void mddev_suspend(struct mddev *mddev) |
409c57f3 | 360 | { |
092398dc | 361 | WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk); |
4d5324f7 | 362 | lockdep_assert_held(&mddev->reconfig_mutex); |
0dc10e50 MP |
363 | if (mddev->suspended++) |
364 | return; | |
409c57f3 | 365 | synchronize_rcu(); |
cc27b0c7 | 366 | wake_up(&mddev->sb_wait); |
35bfc521 N |
367 | set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags); |
368 | smp_mb__after_atomic(); | |
409c57f3 N |
369 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); |
370 | mddev->pers->quiesce(mddev, 1); | |
35bfc521 N |
371 | clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags); |
372 | wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags)); | |
0d9f4f13 JB |
373 | |
374 | del_timer_sync(&mddev->safemode_timer); | |
409c57f3 | 375 | } |
390ee602 | 376 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 377 | |
fd01b88c | 378 | void mddev_resume(struct mddev *mddev) |
409c57f3 | 379 | { |
4d5324f7 | 380 | lockdep_assert_held(&mddev->reconfig_mutex); |
0dc10e50 MP |
381 | if (--mddev->suspended) |
382 | return; | |
409c57f3 N |
383 | wake_up(&mddev->sb_wait); |
384 | mddev->pers->quiesce(mddev, 0); | |
0fd018af | 385 | |
47525e59 | 386 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
0fd018af JB |
387 | md_wakeup_thread(mddev->thread); |
388 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
1da177e4 | 389 | } |
390ee602 | 390 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 391 | |
fd01b88c | 392 | int mddev_congested(struct mddev *mddev, int bits) |
3fa841d7 | 393 | { |
5c675f83 N |
394 | struct md_personality *pers = mddev->pers; |
395 | int ret = 0; | |
396 | ||
397 | rcu_read_lock(); | |
398 | if (mddev->suspended) | |
399 | ret = 1; | |
400 | else if (pers && pers->congested) | |
401 | ret = pers->congested(mddev, bits); | |
402 | rcu_read_unlock(); | |
403 | return ret; | |
404 | } | |
405 | EXPORT_SYMBOL_GPL(mddev_congested); | |
406 | static int md_congested(void *data, int bits) | |
407 | { | |
408 | struct mddev *mddev = data; | |
409 | return mddev_congested(mddev, bits); | |
3fa841d7 | 410 | } |
3fa841d7 | 411 | |
a2826aa9 | 412 | /* |
e9c7469b | 413 | * Generic flush handling for md |
a2826aa9 N |
414 | */ |
415 | ||
4246a0b6 | 416 | static void md_end_flush(struct bio *bio) |
a2826aa9 | 417 | { |
3cb03002 | 418 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 419 | struct mddev *mddev = rdev->mddev; |
a2826aa9 N |
420 | |
421 | rdev_dec_pending(rdev, mddev); | |
422 | ||
423 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b | 424 | /* The pre-request flush has finished */ |
e804ac78 | 425 | queue_work(md_wq, &mddev->flush_work); |
a2826aa9 N |
426 | } |
427 | bio_put(bio); | |
428 | } | |
429 | ||
a7a07e69 N |
430 | static void md_submit_flush_data(struct work_struct *ws); |
431 | ||
a035fc3e | 432 | static void submit_flushes(struct work_struct *ws) |
a2826aa9 | 433 | { |
fd01b88c | 434 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
3cb03002 | 435 | struct md_rdev *rdev; |
a2826aa9 | 436 | |
a7a07e69 N |
437 | INIT_WORK(&mddev->flush_work, md_submit_flush_data); |
438 | atomic_set(&mddev->flush_pending, 1); | |
a2826aa9 | 439 | rcu_read_lock(); |
dafb20fa | 440 | rdev_for_each_rcu(rdev, mddev) |
a2826aa9 N |
441 | if (rdev->raid_disk >= 0 && |
442 | !test_bit(Faulty, &rdev->flags)) { | |
443 | /* Take two references, one is dropped | |
444 | * when request finishes, one after | |
445 | * we reclaim rcu_read_lock | |
446 | */ | |
447 | struct bio *bi; | |
448 | atomic_inc(&rdev->nr_pending); | |
449 | atomic_inc(&rdev->nr_pending); | |
450 | rcu_read_unlock(); | |
b5e1b8ce | 451 | bi = bio_alloc_mddev(GFP_NOIO, 0, mddev); |
e9c7469b | 452 | bi->bi_end_io = md_end_flush; |
a2826aa9 | 453 | bi->bi_private = rdev; |
74d46992 | 454 | bio_set_dev(bi, rdev->bdev); |
70fd7614 | 455 | bi->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH; |
a2826aa9 | 456 | atomic_inc(&mddev->flush_pending); |
4e49ea4a | 457 | submit_bio(bi); |
a2826aa9 N |
458 | rcu_read_lock(); |
459 | rdev_dec_pending(rdev, mddev); | |
460 | } | |
461 | rcu_read_unlock(); | |
a7a07e69 N |
462 | if (atomic_dec_and_test(&mddev->flush_pending)) |
463 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 N |
464 | } |
465 | ||
e9c7469b | 466 | static void md_submit_flush_data(struct work_struct *ws) |
a2826aa9 | 467 | { |
fd01b88c | 468 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
e9c7469b | 469 | struct bio *bio = mddev->flush_bio; |
a2826aa9 | 470 | |
79bf31a3 SL |
471 | /* |
472 | * must reset flush_bio before calling into md_handle_request to avoid a | |
473 | * deadlock, because other bios passed md_handle_request suspend check | |
474 | * could wait for this and below md_handle_request could wait for those | |
475 | * bios because of suspend check | |
476 | */ | |
477 | mddev->flush_bio = NULL; | |
478 | wake_up(&mddev->sb_wait); | |
479 | ||
4f024f37 | 480 | if (bio->bi_iter.bi_size == 0) |
a2826aa9 | 481 | /* an empty barrier - all done */ |
4246a0b6 | 482 | bio_endio(bio); |
a2826aa9 | 483 | else { |
1eff9d32 | 484 | bio->bi_opf &= ~REQ_PREFLUSH; |
79bf31a3 | 485 | md_handle_request(mddev, bio); |
a2826aa9 | 486 | } |
a2826aa9 N |
487 | } |
488 | ||
fd01b88c | 489 | void md_flush_request(struct mddev *mddev, struct bio *bio) |
a2826aa9 | 490 | { |
85572d7c | 491 | spin_lock_irq(&mddev->lock); |
a2826aa9 | 492 | wait_event_lock_irq(mddev->sb_wait, |
e9c7469b | 493 | !mddev->flush_bio, |
85572d7c | 494 | mddev->lock); |
e9c7469b | 495 | mddev->flush_bio = bio; |
85572d7c | 496 | spin_unlock_irq(&mddev->lock); |
a2826aa9 | 497 | |
a035fc3e N |
498 | INIT_WORK(&mddev->flush_work, submit_flushes); |
499 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 | 500 | } |
e9c7469b | 501 | EXPORT_SYMBOL(md_flush_request); |
409c57f3 | 502 | |
fd01b88c | 503 | static inline struct mddev *mddev_get(struct mddev *mddev) |
1da177e4 LT |
504 | { |
505 | atomic_inc(&mddev->active); | |
506 | return mddev; | |
507 | } | |
508 | ||
5fd3a17e | 509 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 510 | |
fd01b88c | 511 | static void mddev_put(struct mddev *mddev) |
1da177e4 | 512 | { |
7184ef8b | 513 | struct bio_set *bs = NULL, *sync_bs = NULL; |
a167f663 | 514 | |
1da177e4 LT |
515 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
516 | return; | |
d3374825 | 517 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
518 | mddev->ctime == 0 && !mddev->hold_active) { |
519 | /* Array is not configured at all, and not held active, | |
520 | * so destroy it */ | |
af8a2434 | 521 | list_del_init(&mddev->all_mddevs); |
a167f663 | 522 | bs = mddev->bio_set; |
7184ef8b | 523 | sync_bs = mddev->sync_set; |
a167f663 | 524 | mddev->bio_set = NULL; |
5a85071c | 525 | mddev->sync_set = NULL; |
d3374825 | 526 | if (mddev->gendisk) { |
e804ac78 TH |
527 | /* We did a probe so need to clean up. Call |
528 | * queue_work inside the spinlock so that | |
529 | * flush_workqueue() after mddev_find will | |
530 | * succeed in waiting for the work to be done. | |
d3374825 N |
531 | */ |
532 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
e804ac78 | 533 | queue_work(md_misc_wq, &mddev->del_work); |
d3374825 N |
534 | } else |
535 | kfree(mddev); | |
536 | } | |
537 | spin_unlock(&all_mddevs_lock); | |
a167f663 N |
538 | if (bs) |
539 | bioset_free(bs); | |
7184ef8b SL |
540 | if (sync_bs) |
541 | bioset_free(sync_bs); | |
1da177e4 LT |
542 | } |
543 | ||
25b2edfa SL |
544 | static void md_safemode_timeout(unsigned long data); |
545 | ||
fd01b88c | 546 | void mddev_init(struct mddev *mddev) |
fafd7fb0 N |
547 | { |
548 | mutex_init(&mddev->open_mutex); | |
549 | mutex_init(&mddev->reconfig_mutex); | |
550 | mutex_init(&mddev->bitmap_info.mutex); | |
551 | INIT_LIST_HEAD(&mddev->disks); | |
552 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
25b2edfa SL |
553 | setup_timer(&mddev->safemode_timer, md_safemode_timeout, |
554 | (unsigned long) mddev); | |
fafd7fb0 N |
555 | atomic_set(&mddev->active, 1); |
556 | atomic_set(&mddev->openers, 0); | |
557 | atomic_set(&mddev->active_io, 0); | |
85572d7c | 558 | spin_lock_init(&mddev->lock); |
fafd7fb0 N |
559 | atomic_set(&mddev->flush_pending, 0); |
560 | init_waitqueue_head(&mddev->sb_wait); | |
561 | init_waitqueue_head(&mddev->recovery_wait); | |
562 | mddev->reshape_position = MaxSector; | |
2c810cdd | 563 | mddev->reshape_backwards = 0; |
c4a39551 | 564 | mddev->last_sync_action = "none"; |
fafd7fb0 N |
565 | mddev->resync_min = 0; |
566 | mddev->resync_max = MaxSector; | |
567 | mddev->level = LEVEL_NONE; | |
568 | } | |
390ee602 | 569 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 570 | |
f72ffdd6 | 571 | static struct mddev *mddev_find(dev_t unit) |
1da177e4 | 572 | { |
fd01b88c | 573 | struct mddev *mddev, *new = NULL; |
1da177e4 | 574 | |
8f5f02c4 N |
575 | if (unit && MAJOR(unit) != MD_MAJOR) |
576 | unit &= ~((1<<MdpMinorShift)-1); | |
577 | ||
1da177e4 LT |
578 | retry: |
579 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
580 | |
581 | if (unit) { | |
582 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
583 | if (mddev->unit == unit) { | |
584 | mddev_get(mddev); | |
585 | spin_unlock(&all_mddevs_lock); | |
586 | kfree(new); | |
587 | return mddev; | |
588 | } | |
589 | ||
590 | if (new) { | |
591 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 592 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
593 | new->hold_active = UNTIL_IOCTL; |
594 | return new; | |
1da177e4 | 595 | } |
efeb53c0 N |
596 | } else if (new) { |
597 | /* find an unused unit number */ | |
598 | static int next_minor = 512; | |
599 | int start = next_minor; | |
600 | int is_free = 0; | |
601 | int dev = 0; | |
602 | while (!is_free) { | |
603 | dev = MKDEV(MD_MAJOR, next_minor); | |
604 | next_minor++; | |
605 | if (next_minor > MINORMASK) | |
606 | next_minor = 0; | |
607 | if (next_minor == start) { | |
608 | /* Oh dear, all in use. */ | |
609 | spin_unlock(&all_mddevs_lock); | |
610 | kfree(new); | |
611 | return NULL; | |
612 | } | |
f72ffdd6 | 613 | |
efeb53c0 N |
614 | is_free = 1; |
615 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
616 | if (mddev->unit == dev) { | |
617 | is_free = 0; | |
618 | break; | |
619 | } | |
620 | } | |
621 | new->unit = dev; | |
622 | new->md_minor = MINOR(dev); | |
623 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
624 | list_add(&new->all_mddevs, &all_mddevs); |
625 | spin_unlock(&all_mddevs_lock); | |
626 | return new; | |
627 | } | |
628 | spin_unlock(&all_mddevs_lock); | |
629 | ||
9ffae0cf | 630 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
631 | if (!new) |
632 | return NULL; | |
633 | ||
1da177e4 LT |
634 | new->unit = unit; |
635 | if (MAJOR(unit) == MD_MAJOR) | |
636 | new->md_minor = MINOR(unit); | |
637 | else | |
638 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
639 | ||
fafd7fb0 | 640 | mddev_init(new); |
1da177e4 | 641 | |
1da177e4 LT |
642 | goto retry; |
643 | } | |
644 | ||
b6eb127d N |
645 | static struct attribute_group md_redundancy_group; |
646 | ||
5c47daf6 | 647 | void mddev_unlock(struct mddev *mddev) |
1da177e4 | 648 | { |
a64c876f | 649 | if (mddev->to_remove) { |
b6eb127d N |
650 | /* These cannot be removed under reconfig_mutex as |
651 | * an access to the files will try to take reconfig_mutex | |
652 | * while holding the file unremovable, which leads to | |
653 | * a deadlock. | |
bb4f1e9d N |
654 | * So hold set sysfs_active while the remove in happeing, |
655 | * and anything else which might set ->to_remove or my | |
656 | * otherwise change the sysfs namespace will fail with | |
657 | * -EBUSY if sysfs_active is still set. | |
658 | * We set sysfs_active under reconfig_mutex and elsewhere | |
659 | * test it under the same mutex to ensure its correct value | |
660 | * is seen. | |
b6eb127d | 661 | */ |
a64c876f N |
662 | struct attribute_group *to_remove = mddev->to_remove; |
663 | mddev->to_remove = NULL; | |
bb4f1e9d | 664 | mddev->sysfs_active = 1; |
b6eb127d N |
665 | mutex_unlock(&mddev->reconfig_mutex); |
666 | ||
00bcb4ac N |
667 | if (mddev->kobj.sd) { |
668 | if (to_remove != &md_redundancy_group) | |
669 | sysfs_remove_group(&mddev->kobj, to_remove); | |
670 | if (mddev->pers == NULL || | |
671 | mddev->pers->sync_request == NULL) { | |
672 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
673 | if (mddev->sysfs_action) | |
674 | sysfs_put(mddev->sysfs_action); | |
675 | mddev->sysfs_action = NULL; | |
676 | } | |
a64c876f | 677 | } |
bb4f1e9d | 678 | mddev->sysfs_active = 0; |
b6eb127d N |
679 | } else |
680 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 681 | |
751e67ca CD |
682 | /* As we've dropped the mutex we need a spinlock to |
683 | * make sure the thread doesn't disappear | |
01f96c0a N |
684 | */ |
685 | spin_lock(&pers_lock); | |
005eca5e | 686 | md_wakeup_thread(mddev->thread); |
4d5324f7 | 687 | wake_up(&mddev->sb_wait); |
01f96c0a | 688 | spin_unlock(&pers_lock); |
1da177e4 | 689 | } |
5c47daf6 | 690 | EXPORT_SYMBOL_GPL(mddev_unlock); |
1da177e4 | 691 | |
57d051dc | 692 | struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr) |
1ca69c4b N |
693 | { |
694 | struct md_rdev *rdev; | |
695 | ||
696 | rdev_for_each_rcu(rdev, mddev) | |
697 | if (rdev->desc_nr == nr) | |
698 | return rdev; | |
699 | ||
700 | return NULL; | |
701 | } | |
57d051dc | 702 | EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu); |
1ca69c4b N |
703 | |
704 | static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev) | |
1da177e4 | 705 | { |
3cb03002 | 706 | struct md_rdev *rdev; |
1da177e4 | 707 | |
dafb20fa | 708 | rdev_for_each(rdev, mddev) |
1da177e4 LT |
709 | if (rdev->bdev->bd_dev == dev) |
710 | return rdev; | |
159ec1fc | 711 | |
1da177e4 LT |
712 | return NULL; |
713 | } | |
714 | ||
1ca69c4b N |
715 | static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev) |
716 | { | |
717 | struct md_rdev *rdev; | |
718 | ||
719 | rdev_for_each_rcu(rdev, mddev) | |
720 | if (rdev->bdev->bd_dev == dev) | |
721 | return rdev; | |
722 | ||
723 | return NULL; | |
724 | } | |
725 | ||
84fc4b56 | 726 | static struct md_personality *find_pers(int level, char *clevel) |
2604b703 | 727 | { |
84fc4b56 | 728 | struct md_personality *pers; |
d9d166c2 N |
729 | list_for_each_entry(pers, &pers_list, list) { |
730 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 731 | return pers; |
d9d166c2 N |
732 | if (strcmp(pers->name, clevel)==0) |
733 | return pers; | |
734 | } | |
2604b703 N |
735 | return NULL; |
736 | } | |
737 | ||
b73df2d3 | 738 | /* return the offset of the super block in 512byte sectors */ |
3cb03002 | 739 | static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) |
1da177e4 | 740 | { |
57b2caa3 | 741 | sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; |
b73df2d3 | 742 | return MD_NEW_SIZE_SECTORS(num_sectors); |
1da177e4 LT |
743 | } |
744 | ||
f72ffdd6 | 745 | static int alloc_disk_sb(struct md_rdev *rdev) |
1da177e4 | 746 | { |
1da177e4 | 747 | rdev->sb_page = alloc_page(GFP_KERNEL); |
7f0f0d87 | 748 | if (!rdev->sb_page) |
ebc24337 | 749 | return -ENOMEM; |
1da177e4 LT |
750 | return 0; |
751 | } | |
752 | ||
545c8795 | 753 | void md_rdev_clear(struct md_rdev *rdev) |
1da177e4 LT |
754 | { |
755 | if (rdev->sb_page) { | |
2d1f3b5d | 756 | put_page(rdev->sb_page); |
1da177e4 LT |
757 | rdev->sb_loaded = 0; |
758 | rdev->sb_page = NULL; | |
0f420358 | 759 | rdev->sb_start = 0; |
dd8ac336 | 760 | rdev->sectors = 0; |
1da177e4 | 761 | } |
2699b672 N |
762 | if (rdev->bb_page) { |
763 | put_page(rdev->bb_page); | |
764 | rdev->bb_page = NULL; | |
765 | } | |
d3b407fb | 766 | badblocks_exit(&rdev->badblocks); |
1da177e4 | 767 | } |
545c8795 | 768 | EXPORT_SYMBOL_GPL(md_rdev_clear); |
1da177e4 | 769 | |
4246a0b6 | 770 | static void super_written(struct bio *bio) |
7bfa19f2 | 771 | { |
3cb03002 | 772 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 773 | struct mddev *mddev = rdev->mddev; |
7bfa19f2 | 774 | |
4e4cbee9 CH |
775 | if (bio->bi_status) { |
776 | pr_err("md: super_written gets error=%d\n", bio->bi_status); | |
a9701a30 | 777 | md_error(mddev, rdev); |
46533ff7 N |
778 | if (!test_bit(Faulty, &rdev->flags) |
779 | && (bio->bi_opf & MD_FAILFAST)) { | |
2953079c | 780 | set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags); |
46533ff7 N |
781 | set_bit(LastDev, &rdev->flags); |
782 | } | |
783 | } else | |
784 | clear_bit(LastDev, &rdev->flags); | |
7bfa19f2 | 785 | |
a9701a30 N |
786 | if (atomic_dec_and_test(&mddev->pending_writes)) |
787 | wake_up(&mddev->sb_wait); | |
ed3b98c7 | 788 | rdev_dec_pending(rdev, mddev); |
f8b58edf | 789 | bio_put(bio); |
7bfa19f2 N |
790 | } |
791 | ||
fd01b88c | 792 | void md_super_write(struct mddev *mddev, struct md_rdev *rdev, |
7bfa19f2 N |
793 | sector_t sector, int size, struct page *page) |
794 | { | |
795 | /* write first size bytes of page to sector of rdev | |
796 | * Increment mddev->pending_writes before returning | |
797 | * and decrement it on completion, waking up sb_wait | |
798 | * if zero is reached. | |
799 | * If an error occurred, call md_error | |
800 | */ | |
46533ff7 N |
801 | struct bio *bio; |
802 | int ff = 0; | |
803 | ||
804 | if (test_bit(Faulty, &rdev->flags)) | |
805 | return; | |
806 | ||
5a85071c | 807 | bio = md_bio_alloc_sync(mddev); |
7bfa19f2 | 808 | |
ed3b98c7 SL |
809 | atomic_inc(&rdev->nr_pending); |
810 | ||
74d46992 | 811 | bio_set_dev(bio, rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev); |
4f024f37 | 812 | bio->bi_iter.bi_sector = sector; |
7bfa19f2 N |
813 | bio_add_page(bio, page, size, 0); |
814 | bio->bi_private = rdev; | |
815 | bio->bi_end_io = super_written; | |
46533ff7 N |
816 | |
817 | if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) && | |
818 | test_bit(FailFast, &rdev->flags) && | |
819 | !test_bit(LastDev, &rdev->flags)) | |
820 | ff = MD_FAILFAST; | |
5a8948f8 | 821 | bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA | ff; |
a9701a30 | 822 | |
7bfa19f2 | 823 | atomic_inc(&mddev->pending_writes); |
4e49ea4a | 824 | submit_bio(bio); |
a9701a30 N |
825 | } |
826 | ||
46533ff7 | 827 | int md_super_wait(struct mddev *mddev) |
a9701a30 | 828 | { |
e9c7469b | 829 | /* wait for all superblock writes that were scheduled to complete */ |
1967cd56 | 830 | wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); |
2953079c | 831 | if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags)) |
46533ff7 N |
832 | return -EAGAIN; |
833 | return 0; | |
7bfa19f2 N |
834 | } |
835 | ||
3cb03002 | 836 | int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
796a5cf0 | 837 | struct page *page, int op, int op_flags, bool metadata_op) |
1da177e4 | 838 | { |
5a85071c | 839 | struct bio *bio = md_bio_alloc_sync(rdev->mddev); |
1da177e4 LT |
840 | int ret; |
841 | ||
74d46992 CH |
842 | if (metadata_op && rdev->meta_bdev) |
843 | bio_set_dev(bio, rdev->meta_bdev); | |
844 | else | |
845 | bio_set_dev(bio, rdev->bdev); | |
796a5cf0 | 846 | bio_set_op_attrs(bio, op, op_flags); |
ccebd4c4 | 847 | if (metadata_op) |
4f024f37 | 848 | bio->bi_iter.bi_sector = sector + rdev->sb_start; |
1fdd6fc9 N |
849 | else if (rdev->mddev->reshape_position != MaxSector && |
850 | (rdev->mddev->reshape_backwards == | |
851 | (sector >= rdev->mddev->reshape_position))) | |
4f024f37 | 852 | bio->bi_iter.bi_sector = sector + rdev->new_data_offset; |
ccebd4c4 | 853 | else |
4f024f37 | 854 | bio->bi_iter.bi_sector = sector + rdev->data_offset; |
1da177e4 | 855 | bio_add_page(bio, page, size, 0); |
4e49ea4a MC |
856 | |
857 | submit_bio_wait(bio); | |
1da177e4 | 858 | |
4e4cbee9 | 859 | ret = !bio->bi_status; |
1da177e4 LT |
860 | bio_put(bio); |
861 | return ret; | |
862 | } | |
a8745db2 | 863 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 864 | |
f72ffdd6 | 865 | static int read_disk_sb(struct md_rdev *rdev, int size) |
1da177e4 LT |
866 | { |
867 | char b[BDEVNAME_SIZE]; | |
403df478 | 868 | |
1da177e4 LT |
869 | if (rdev->sb_loaded) |
870 | return 0; | |
871 | ||
796a5cf0 | 872 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true)) |
1da177e4 LT |
873 | goto fail; |
874 | rdev->sb_loaded = 1; | |
875 | return 0; | |
876 | ||
877 | fail: | |
9d48739e N |
878 | pr_err("md: disabled device %s, could not read superblock.\n", |
879 | bdevname(rdev->bdev,b)); | |
1da177e4 LT |
880 | return -EINVAL; |
881 | } | |
882 | ||
e6fd2093 | 883 | static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
1da177e4 | 884 | { |
f72ffdd6 | 885 | return sb1->set_uuid0 == sb2->set_uuid0 && |
05710466 AN |
886 | sb1->set_uuid1 == sb2->set_uuid1 && |
887 | sb1->set_uuid2 == sb2->set_uuid2 && | |
888 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
889 | } |
890 | ||
e6fd2093 | 891 | static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
1da177e4 LT |
892 | { |
893 | int ret; | |
894 | mdp_super_t *tmp1, *tmp2; | |
895 | ||
896 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
897 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
898 | ||
899 | if (!tmp1 || !tmp2) { | |
900 | ret = 0; | |
1da177e4 LT |
901 | goto abort; |
902 | } | |
903 | ||
904 | *tmp1 = *sb1; | |
905 | *tmp2 = *sb2; | |
906 | ||
907 | /* | |
908 | * nr_disks is not constant | |
909 | */ | |
910 | tmp1->nr_disks = 0; | |
911 | tmp2->nr_disks = 0; | |
912 | ||
ce0c8e05 | 913 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 914 | abort: |
990a8baf JJ |
915 | kfree(tmp1); |
916 | kfree(tmp2); | |
1da177e4 LT |
917 | return ret; |
918 | } | |
919 | ||
4d167f09 N |
920 | static u32 md_csum_fold(u32 csum) |
921 | { | |
922 | csum = (csum & 0xffff) + (csum >> 16); | |
923 | return (csum & 0xffff) + (csum >> 16); | |
924 | } | |
925 | ||
f72ffdd6 | 926 | static unsigned int calc_sb_csum(mdp_super_t *sb) |
1da177e4 | 927 | { |
4d167f09 N |
928 | u64 newcsum = 0; |
929 | u32 *sb32 = (u32*)sb; | |
930 | int i; | |
1da177e4 LT |
931 | unsigned int disk_csum, csum; |
932 | ||
933 | disk_csum = sb->sb_csum; | |
934 | sb->sb_csum = 0; | |
4d167f09 N |
935 | |
936 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
937 | newcsum += sb32[i]; | |
938 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
939 | ||
4d167f09 N |
940 | #ifdef CONFIG_ALPHA |
941 | /* This used to use csum_partial, which was wrong for several | |
942 | * reasons including that different results are returned on | |
943 | * different architectures. It isn't critical that we get exactly | |
944 | * the same return value as before (we always csum_fold before | |
945 | * testing, and that removes any differences). However as we | |
946 | * know that csum_partial always returned a 16bit value on | |
947 | * alphas, do a fold to maximise conformity to previous behaviour. | |
948 | */ | |
949 | sb->sb_csum = md_csum_fold(disk_csum); | |
950 | #else | |
1da177e4 | 951 | sb->sb_csum = disk_csum; |
4d167f09 | 952 | #endif |
1da177e4 LT |
953 | return csum; |
954 | } | |
955 | ||
1da177e4 LT |
956 | /* |
957 | * Handle superblock details. | |
958 | * We want to be able to handle multiple superblock formats | |
959 | * so we have a common interface to them all, and an array of | |
960 | * different handlers. | |
961 | * We rely on user-space to write the initial superblock, and support | |
962 | * reading and updating of superblocks. | |
963 | * Interface methods are: | |
3cb03002 | 964 | * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
965 | * loads and validates a superblock on dev. |
966 | * if refdev != NULL, compare superblocks on both devices | |
967 | * Return: | |
968 | * 0 - dev has a superblock that is compatible with refdev | |
969 | * 1 - dev has a superblock that is compatible and newer than refdev | |
970 | * so dev should be used as the refdev in future | |
971 | * -EINVAL superblock incompatible or invalid | |
972 | * -othererror e.g. -EIO | |
973 | * | |
fd01b88c | 974 | * int validate_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
975 | * Verify that dev is acceptable into mddev. |
976 | * The first time, mddev->raid_disks will be 0, and data from | |
977 | * dev should be merged in. Subsequent calls check that dev | |
978 | * is new enough. Return 0 or -EINVAL | |
979 | * | |
fd01b88c | 980 | * void sync_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
981 | * Update the superblock for rdev with data in mddev |
982 | * This does not write to disc. | |
983 | * | |
984 | */ | |
985 | ||
986 | struct super_type { | |
0cd17fec CW |
987 | char *name; |
988 | struct module *owner; | |
c6563a8c N |
989 | int (*load_super)(struct md_rdev *rdev, |
990 | struct md_rdev *refdev, | |
0cd17fec | 991 | int minor_version); |
c6563a8c N |
992 | int (*validate_super)(struct mddev *mddev, |
993 | struct md_rdev *rdev); | |
994 | void (*sync_super)(struct mddev *mddev, | |
995 | struct md_rdev *rdev); | |
3cb03002 | 996 | unsigned long long (*rdev_size_change)(struct md_rdev *rdev, |
15f4a5fd | 997 | sector_t num_sectors); |
c6563a8c N |
998 | int (*allow_new_offset)(struct md_rdev *rdev, |
999 | unsigned long long new_offset); | |
1da177e4 LT |
1000 | }; |
1001 | ||
0894cc30 AN |
1002 | /* |
1003 | * Check that the given mddev has no bitmap. | |
1004 | * | |
1005 | * This function is called from the run method of all personalities that do not | |
1006 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
1007 | * has a bitmap. Otherwise, it returns 0. | |
1008 | * | |
1009 | */ | |
fd01b88c | 1010 | int md_check_no_bitmap(struct mddev *mddev) |
0894cc30 | 1011 | { |
c3d9714e | 1012 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 | 1013 | return 0; |
9d48739e | 1014 | pr_warn("%s: bitmaps are not supported for %s\n", |
0894cc30 AN |
1015 | mdname(mddev), mddev->pers->name); |
1016 | return 1; | |
1017 | } | |
1018 | EXPORT_SYMBOL(md_check_no_bitmap); | |
1019 | ||
1da177e4 | 1020 | /* |
f72ffdd6 | 1021 | * load_super for 0.90.0 |
1da177e4 | 1022 | */ |
3cb03002 | 1023 | static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1024 | { |
1025 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
1026 | mdp_super_t *sb; | |
1027 | int ret; | |
1da177e4 LT |
1028 | |
1029 | /* | |
0f420358 | 1030 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
1031 | * it's at the end of the disk. |
1032 | * | |
1033 | * It also happens to be a multiple of 4Kb. | |
1034 | */ | |
57b2caa3 | 1035 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 1036 | |
0002b271 | 1037 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
9d48739e N |
1038 | if (ret) |
1039 | return ret; | |
1da177e4 LT |
1040 | |
1041 | ret = -EINVAL; | |
1042 | ||
1043 | bdevname(rdev->bdev, b); | |
65a06f06 | 1044 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1045 | |
1046 | if (sb->md_magic != MD_SB_MAGIC) { | |
9d48739e | 1047 | pr_warn("md: invalid raid superblock magic on %s\n", b); |
1da177e4 LT |
1048 | goto abort; |
1049 | } | |
1050 | ||
1051 | if (sb->major_version != 0 || | |
f6705578 N |
1052 | sb->minor_version < 90 || |
1053 | sb->minor_version > 91) { | |
9d48739e N |
1054 | pr_warn("Bad version number %d.%d on %s\n", |
1055 | sb->major_version, sb->minor_version, b); | |
1da177e4 LT |
1056 | goto abort; |
1057 | } | |
1058 | ||
1059 | if (sb->raid_disks <= 0) | |
1060 | goto abort; | |
1061 | ||
4d167f09 | 1062 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
9d48739e | 1063 | pr_warn("md: invalid superblock checksum on %s\n", b); |
1da177e4 LT |
1064 | goto abort; |
1065 | } | |
1066 | ||
1067 | rdev->preferred_minor = sb->md_minor; | |
1068 | rdev->data_offset = 0; | |
c6563a8c | 1069 | rdev->new_data_offset = 0; |
0002b271 | 1070 | rdev->sb_size = MD_SB_BYTES; |
9f2f3830 | 1071 | rdev->badblocks.shift = -1; |
1da177e4 LT |
1072 | |
1073 | if (sb->level == LEVEL_MULTIPATH) | |
1074 | rdev->desc_nr = -1; | |
1075 | else | |
1076 | rdev->desc_nr = sb->this_disk.number; | |
1077 | ||
9a7b2b0f | 1078 | if (!refdev) { |
1da177e4 | 1079 | ret = 1; |
9a7b2b0f | 1080 | } else { |
1da177e4 | 1081 | __u64 ev1, ev2; |
65a06f06 | 1082 | mdp_super_t *refsb = page_address(refdev->sb_page); |
e6fd2093 | 1083 | if (!md_uuid_equal(refsb, sb)) { |
9d48739e | 1084 | pr_warn("md: %s has different UUID to %s\n", |
1da177e4 LT |
1085 | b, bdevname(refdev->bdev,b2)); |
1086 | goto abort; | |
1087 | } | |
e6fd2093 | 1088 | if (!md_sb_equal(refsb, sb)) { |
9d48739e N |
1089 | pr_warn("md: %s has same UUID but different superblock to %s\n", |
1090 | b, bdevname(refdev->bdev, b2)); | |
1da177e4 LT |
1091 | goto abort; |
1092 | } | |
1093 | ev1 = md_event(sb); | |
1094 | ev2 = md_event(refsb); | |
1095 | if (ev1 > ev2) | |
1096 | ret = 1; | |
f72ffdd6 | 1097 | else |
1da177e4 LT |
1098 | ret = 0; |
1099 | } | |
8190e754 | 1100 | rdev->sectors = rdev->sb_start; |
667a5313 N |
1101 | /* Limit to 4TB as metadata cannot record more than that. |
1102 | * (not needed for Linear and RAID0 as metadata doesn't | |
1103 | * record this size) | |
1104 | */ | |
3312c951 AB |
1105 | if (IS_ENABLED(CONFIG_LBDAF) && (u64)rdev->sectors >= (2ULL << 32) && |
1106 | sb->level >= 1) | |
1107 | rdev->sectors = (sector_t)(2ULL << 32) - 2; | |
1da177e4 | 1108 | |
27a7b260 | 1109 | if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) |
2bf071bf N |
1110 | /* "this cannot possibly happen" ... */ |
1111 | ret = -EINVAL; | |
1112 | ||
1da177e4 LT |
1113 | abort: |
1114 | return ret; | |
1115 | } | |
1116 | ||
1117 | /* | |
1118 | * validate_super for 0.90.0 | |
1119 | */ | |
fd01b88c | 1120 | static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1121 | { |
1122 | mdp_disk_t *desc; | |
65a06f06 | 1123 | mdp_super_t *sb = page_address(rdev->sb_page); |
07d84d10 | 1124 | __u64 ev1 = md_event(sb); |
1da177e4 | 1125 | |
41158c7e | 1126 | rdev->raid_disk = -1; |
c5d79adb N |
1127 | clear_bit(Faulty, &rdev->flags); |
1128 | clear_bit(In_sync, &rdev->flags); | |
8313b8e5 | 1129 | clear_bit(Bitmap_sync, &rdev->flags); |
c5d79adb | 1130 | clear_bit(WriteMostly, &rdev->flags); |
c5d79adb | 1131 | |
1da177e4 LT |
1132 | if (mddev->raid_disks == 0) { |
1133 | mddev->major_version = 0; | |
1134 | mddev->minor_version = sb->minor_version; | |
1135 | mddev->patch_version = sb->patch_version; | |
e691063a | 1136 | mddev->external = 0; |
9d8f0363 | 1137 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1138 | mddev->ctime = sb->ctime; |
1139 | mddev->utime = sb->utime; | |
1140 | mddev->level = sb->level; | |
d9d166c2 | 1141 | mddev->clevel[0] = 0; |
1da177e4 LT |
1142 | mddev->layout = sb->layout; |
1143 | mddev->raid_disks = sb->raid_disks; | |
27a7b260 | 1144 | mddev->dev_sectors = ((sector_t)sb->size) * 2; |
07d84d10 | 1145 | mddev->events = ev1; |
c3d9714e | 1146 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1147 | mddev->bitmap_info.space = 0; |
1148 | /* bitmap can use 60 K after the 4K superblocks */ | |
c3d9714e | 1149 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 1150 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
2c810cdd | 1151 | mddev->reshape_backwards = 0; |
1da177e4 | 1152 | |
f6705578 N |
1153 | if (mddev->minor_version >= 91) { |
1154 | mddev->reshape_position = sb->reshape_position; | |
1155 | mddev->delta_disks = sb->delta_disks; | |
1156 | mddev->new_level = sb->new_level; | |
1157 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1158 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
2c810cdd N |
1159 | if (mddev->delta_disks < 0) |
1160 | mddev->reshape_backwards = 1; | |
f6705578 N |
1161 | } else { |
1162 | mddev->reshape_position = MaxSector; | |
1163 | mddev->delta_disks = 0; | |
1164 | mddev->new_level = mddev->level; | |
1165 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1166 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1167 | } |
1168 | ||
1da177e4 LT |
1169 | if (sb->state & (1<<MD_SB_CLEAN)) |
1170 | mddev->recovery_cp = MaxSector; | |
1171 | else { | |
f72ffdd6 | 1172 | if (sb->events_hi == sb->cp_events_hi && |
1da177e4 LT |
1173 | sb->events_lo == sb->cp_events_lo) { |
1174 | mddev->recovery_cp = sb->recovery_cp; | |
1175 | } else | |
1176 | mddev->recovery_cp = 0; | |
1177 | } | |
1178 | ||
1179 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1180 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1181 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1182 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1183 | ||
1184 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1185 | |
1186 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
6409bb05 | 1187 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1188 | mddev->bitmap_info.offset = |
1189 | mddev->bitmap_info.default_offset; | |
6409bb05 | 1190 | mddev->bitmap_info.space = |
c9ad020f | 1191 | mddev->bitmap_info.default_space; |
6409bb05 | 1192 | } |
a654b9d8 | 1193 | |
41158c7e | 1194 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1195 | /* Insist on good event counter while assembling, except |
1196 | * for spares (which don't need an event count) */ | |
1da177e4 | 1197 | ++ev1; |
be6800a7 N |
1198 | if (sb->disks[rdev->desc_nr].state & ( |
1199 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
f72ffdd6 | 1200 | if (ev1 < mddev->events) |
be6800a7 | 1201 | return -EINVAL; |
41158c7e N |
1202 | } else if (mddev->bitmap) { |
1203 | /* if adding to array with a bitmap, then we can accept an | |
1204 | * older device ... but not too old. | |
1205 | */ | |
41158c7e N |
1206 | if (ev1 < mddev->bitmap->events_cleared) |
1207 | return 0; | |
8313b8e5 N |
1208 | if (ev1 < mddev->events) |
1209 | set_bit(Bitmap_sync, &rdev->flags); | |
07d84d10 N |
1210 | } else { |
1211 | if (ev1 < mddev->events) | |
1212 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1213 | return 0; | |
1214 | } | |
41158c7e | 1215 | |
1da177e4 | 1216 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1217 | desc = sb->disks + rdev->desc_nr; |
1218 | ||
1219 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1220 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1221 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1222 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1223 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1224 | rdev->raid_disk = desc->raid_disk; |
f466722c | 1225 | rdev->saved_raid_disk = desc->raid_disk; |
0261cd9f N |
1226 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1227 | /* active but not in sync implies recovery up to | |
1228 | * reshape position. We don't know exactly where | |
1229 | * that is, so set to zero for now */ | |
1230 | if (mddev->minor_version >= 91) { | |
1231 | rdev->recovery_offset = 0; | |
1232 | rdev->raid_disk = desc->raid_disk; | |
1233 | } | |
1da177e4 | 1234 | } |
8ddf9efe N |
1235 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1236 | set_bit(WriteMostly, &rdev->flags); | |
688834e6 N |
1237 | if (desc->state & (1<<MD_DISK_FAILFAST)) |
1238 | set_bit(FailFast, &rdev->flags); | |
41158c7e | 1239 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1240 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1241 | return 0; |
1242 | } | |
1243 | ||
1244 | /* | |
1245 | * sync_super for 0.90.0 | |
1246 | */ | |
fd01b88c | 1247 | static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1248 | { |
1249 | mdp_super_t *sb; | |
3cb03002 | 1250 | struct md_rdev *rdev2; |
1da177e4 | 1251 | int next_spare = mddev->raid_disks; |
19133a42 | 1252 | |
1da177e4 LT |
1253 | /* make rdev->sb match mddev data.. |
1254 | * | |
1255 | * 1/ zero out disks | |
1256 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1257 | * 3/ any empty disks < next_spare become removed | |
1258 | * | |
1259 | * disks[0] gets initialised to REMOVED because | |
1260 | * we cannot be sure from other fields if it has | |
1261 | * been initialised or not. | |
1262 | */ | |
1263 | int i; | |
1264 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1265 | ||
61181565 N |
1266 | rdev->sb_size = MD_SB_BYTES; |
1267 | ||
65a06f06 | 1268 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1269 | |
1270 | memset(sb, 0, sizeof(*sb)); | |
1271 | ||
1272 | sb->md_magic = MD_SB_MAGIC; | |
1273 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1274 | sb->patch_version = mddev->patch_version; |
1275 | sb->gvalid_words = 0; /* ignored */ | |
1276 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1277 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1278 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1279 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1280 | ||
9ebc6ef1 | 1281 | sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX); |
1da177e4 | 1282 | sb->level = mddev->level; |
58c0fed4 | 1283 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1284 | sb->raid_disks = mddev->raid_disks; |
1285 | sb->md_minor = mddev->md_minor; | |
e691063a | 1286 | sb->not_persistent = 0; |
9ebc6ef1 | 1287 | sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX); |
1da177e4 LT |
1288 | sb->state = 0; |
1289 | sb->events_hi = (mddev->events>>32); | |
1290 | sb->events_lo = (u32)mddev->events; | |
1291 | ||
f6705578 N |
1292 | if (mddev->reshape_position == MaxSector) |
1293 | sb->minor_version = 90; | |
1294 | else { | |
1295 | sb->minor_version = 91; | |
1296 | sb->reshape_position = mddev->reshape_position; | |
1297 | sb->new_level = mddev->new_level; | |
1298 | sb->delta_disks = mddev->delta_disks; | |
1299 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1300 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1301 | } |
1302 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1303 | if (mddev->in_sync) |
1304 | { | |
1305 | sb->recovery_cp = mddev->recovery_cp; | |
1306 | sb->cp_events_hi = (mddev->events>>32); | |
1307 | sb->cp_events_lo = (u32)mddev->events; | |
1308 | if (mddev->recovery_cp == MaxSector) | |
1309 | sb->state = (1<< MD_SB_CLEAN); | |
1310 | } else | |
1311 | sb->recovery_cp = 0; | |
1312 | ||
1313 | sb->layout = mddev->layout; | |
9d8f0363 | 1314 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1315 | |
c3d9714e | 1316 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1317 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1318 | ||
1da177e4 | 1319 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
dafb20fa | 1320 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1321 | mdp_disk_t *d; |
86e6ffdd | 1322 | int desc_nr; |
0261cd9f N |
1323 | int is_active = test_bit(In_sync, &rdev2->flags); |
1324 | ||
1325 | if (rdev2->raid_disk >= 0 && | |
1326 | sb->minor_version >= 91) | |
1327 | /* we have nowhere to store the recovery_offset, | |
1328 | * but if it is not below the reshape_position, | |
1329 | * we can piggy-back on that. | |
1330 | */ | |
1331 | is_active = 1; | |
1332 | if (rdev2->raid_disk < 0 || | |
1333 | test_bit(Faulty, &rdev2->flags)) | |
1334 | is_active = 0; | |
1335 | if (is_active) | |
86e6ffdd | 1336 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1337 | else |
86e6ffdd | 1338 | desc_nr = next_spare++; |
19133a42 | 1339 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1340 | d = &sb->disks[rdev2->desc_nr]; |
1341 | nr_disks++; | |
1342 | d->number = rdev2->desc_nr; | |
1343 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1344 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1345 | if (is_active) |
1da177e4 LT |
1346 | d->raid_disk = rdev2->raid_disk; |
1347 | else | |
1348 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1349 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1350 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1351 | else if (is_active) { |
1da177e4 | 1352 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1353 | if (test_bit(In_sync, &rdev2->flags)) |
1354 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1355 | active++; |
1356 | working++; | |
1357 | } else { | |
1358 | d->state = 0; | |
1359 | spare++; | |
1360 | working++; | |
1361 | } | |
8ddf9efe N |
1362 | if (test_bit(WriteMostly, &rdev2->flags)) |
1363 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
688834e6 N |
1364 | if (test_bit(FailFast, &rdev2->flags)) |
1365 | d->state |= (1<<MD_DISK_FAILFAST); | |
1da177e4 | 1366 | } |
1da177e4 LT |
1367 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1368 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1369 | mdp_disk_t *d = &sb->disks[i]; | |
1370 | if (d->state == 0 && d->number == 0) { | |
1371 | d->number = i; | |
1372 | d->raid_disk = i; | |
1373 | d->state = (1<<MD_DISK_REMOVED); | |
1374 | d->state |= (1<<MD_DISK_FAULTY); | |
1375 | failed++; | |
1376 | } | |
1377 | } | |
1378 | sb->nr_disks = nr_disks; | |
1379 | sb->active_disks = active; | |
1380 | sb->working_disks = working; | |
1381 | sb->failed_disks = failed; | |
1382 | sb->spare_disks = spare; | |
1383 | ||
1384 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1385 | sb->sb_csum = calc_sb_csum(sb); | |
1386 | } | |
1387 | ||
0cd17fec CW |
1388 | /* |
1389 | * rdev_size_change for 0.90.0 | |
1390 | */ | |
1391 | static unsigned long long | |
3cb03002 | 1392 | super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec | 1393 | { |
58c0fed4 | 1394 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1395 | return 0; /* component must fit device */ |
c3d9714e | 1396 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1397 | return 0; /* can't move bitmap */ |
57b2caa3 | 1398 | rdev->sb_start = calc_dev_sboffset(rdev); |
15f4a5fd AN |
1399 | if (!num_sectors || num_sectors > rdev->sb_start) |
1400 | num_sectors = rdev->sb_start; | |
27a7b260 N |
1401 | /* Limit to 4TB as metadata cannot record more than that. |
1402 | * 4TB == 2^32 KB, or 2*2^32 sectors. | |
1403 | */ | |
3312c951 AB |
1404 | if (IS_ENABLED(CONFIG_LBDAF) && (u64)num_sectors >= (2ULL << 32) && |
1405 | rdev->mddev->level >= 1) | |
1406 | num_sectors = (sector_t)(2ULL << 32) - 2; | |
46533ff7 N |
1407 | do { |
1408 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, | |
0cd17fec | 1409 | rdev->sb_page); |
46533ff7 | 1410 | } while (md_super_wait(rdev->mddev) < 0); |
c26a44ed | 1411 | return num_sectors; |
0cd17fec CW |
1412 | } |
1413 | ||
c6563a8c N |
1414 | static int |
1415 | super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) | |
1416 | { | |
1417 | /* non-zero offset changes not possible with v0.90 */ | |
1418 | return new_offset == 0; | |
1419 | } | |
0cd17fec | 1420 | |
1da177e4 LT |
1421 | /* |
1422 | * version 1 superblock | |
1423 | */ | |
1424 | ||
f72ffdd6 | 1425 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb) |
1da177e4 | 1426 | { |
1c05b4bc N |
1427 | __le32 disk_csum; |
1428 | u32 csum; | |
1da177e4 LT |
1429 | unsigned long long newcsum; |
1430 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1431 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1432 | |
1433 | disk_csum = sb->sb_csum; | |
1434 | sb->sb_csum = 0; | |
1435 | newcsum = 0; | |
1f3c9907 | 1436 | for (; size >= 4; size -= 4) |
1da177e4 LT |
1437 | newcsum += le32_to_cpu(*isuper++); |
1438 | ||
1439 | if (size == 2) | |
1c05b4bc | 1440 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1441 | |
1442 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1443 | sb->sb_csum = disk_csum; | |
1444 | return cpu_to_le32(csum); | |
1445 | } | |
1446 | ||
3cb03002 | 1447 | static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1448 | { |
1449 | struct mdp_superblock_1 *sb; | |
1450 | int ret; | |
0f420358 | 1451 | sector_t sb_start; |
c6563a8c | 1452 | sector_t sectors; |
1da177e4 | 1453 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1454 | int bmask; |
1da177e4 LT |
1455 | |
1456 | /* | |
0f420358 | 1457 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1458 | * It is always aligned to a 4K boundary and |
1459 | * depeding on minor_version, it can be: | |
1460 | * 0: At least 8K, but less than 12K, from end of device | |
1461 | * 1: At start of device | |
1462 | * 2: 4K from start of device. | |
1463 | */ | |
1464 | switch(minor_version) { | |
1465 | case 0: | |
77304d2a | 1466 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
0f420358 AN |
1467 | sb_start -= 8*2; |
1468 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1469 | break; |
1470 | case 1: | |
0f420358 | 1471 | sb_start = 0; |
1da177e4 LT |
1472 | break; |
1473 | case 2: | |
0f420358 | 1474 | sb_start = 8; |
1da177e4 LT |
1475 | break; |
1476 | default: | |
1477 | return -EINVAL; | |
1478 | } | |
0f420358 | 1479 | rdev->sb_start = sb_start; |
1da177e4 | 1480 | |
0002b271 N |
1481 | /* superblock is rarely larger than 1K, but it can be larger, |
1482 | * and it is safe to read 4k, so we do that | |
1483 | */ | |
1484 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1485 | if (ret) return ret; |
1486 | ||
65a06f06 | 1487 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1488 | |
1489 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1490 | sb->major_version != cpu_to_le32(1) || | |
1491 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1492 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1493 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1494 | return -EINVAL; |
1495 | ||
1496 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
9d48739e | 1497 | pr_warn("md: invalid superblock checksum on %s\n", |
1da177e4 LT |
1498 | bdevname(rdev->bdev,b)); |
1499 | return -EINVAL; | |
1500 | } | |
1501 | if (le64_to_cpu(sb->data_size) < 10) { | |
9d48739e N |
1502 | pr_warn("md: data_size too small on %s\n", |
1503 | bdevname(rdev->bdev,b)); | |
1da177e4 LT |
1504 | return -EINVAL; |
1505 | } | |
c6563a8c N |
1506 | if (sb->pad0 || |
1507 | sb->pad3[0] || | |
1508 | memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1]))) | |
1509 | /* Some padding is non-zero, might be a new feature */ | |
1510 | return -EINVAL; | |
e11e93fa | 1511 | |
1da177e4 LT |
1512 | rdev->preferred_minor = 0xffff; |
1513 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
c6563a8c N |
1514 | rdev->new_data_offset = rdev->data_offset; |
1515 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) && | |
1516 | (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET)) | |
1517 | rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset); | |
4dbcdc75 | 1518 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1519 | |
0002b271 | 1520 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1521 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1522 | if (rdev->sb_size & bmask) |
a1801f85 N |
1523 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1524 | ||
1525 | if (minor_version | |
0f420358 | 1526 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1527 | return -EINVAL; |
c6563a8c N |
1528 | if (minor_version |
1529 | && rdev->new_data_offset < sb_start + (rdev->sb_size/512)) | |
1530 | return -EINVAL; | |
0002b271 | 1531 | |
31b65a0d N |
1532 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1533 | rdev->desc_nr = -1; | |
1534 | else | |
1535 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1536 | ||
2699b672 N |
1537 | if (!rdev->bb_page) { |
1538 | rdev->bb_page = alloc_page(GFP_KERNEL); | |
1539 | if (!rdev->bb_page) | |
1540 | return -ENOMEM; | |
1541 | } | |
1542 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && | |
1543 | rdev->badblocks.count == 0) { | |
1544 | /* need to load the bad block list. | |
1545 | * Currently we limit it to one page. | |
1546 | */ | |
1547 | s32 offset; | |
1548 | sector_t bb_sector; | |
1549 | u64 *bbp; | |
1550 | int i; | |
1551 | int sectors = le16_to_cpu(sb->bblog_size); | |
1552 | if (sectors > (PAGE_SIZE / 512)) | |
1553 | return -EINVAL; | |
1554 | offset = le32_to_cpu(sb->bblog_offset); | |
1555 | if (offset == 0) | |
1556 | return -EINVAL; | |
1557 | bb_sector = (long long)offset; | |
1558 | if (!sync_page_io(rdev, bb_sector, sectors << 9, | |
796a5cf0 | 1559 | rdev->bb_page, REQ_OP_READ, 0, true)) |
2699b672 N |
1560 | return -EIO; |
1561 | bbp = (u64 *)page_address(rdev->bb_page); | |
1562 | rdev->badblocks.shift = sb->bblog_shift; | |
1563 | for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { | |
1564 | u64 bb = le64_to_cpu(*bbp); | |
1565 | int count = bb & (0x3ff); | |
1566 | u64 sector = bb >> 10; | |
1567 | sector <<= sb->bblog_shift; | |
1568 | count <<= sb->bblog_shift; | |
1569 | if (bb + 1 == 0) | |
1570 | break; | |
fc974ee2 | 1571 | if (badblocks_set(&rdev->badblocks, sector, count, 1)) |
2699b672 N |
1572 | return -EINVAL; |
1573 | } | |
486adf72 N |
1574 | } else if (sb->bblog_offset != 0) |
1575 | rdev->badblocks.shift = 0; | |
2699b672 | 1576 | |
ddc08823 PB |
1577 | if ((le32_to_cpu(sb->feature_map) & |
1578 | (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) { | |
ea0213e0 AP |
1579 | rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset); |
1580 | rdev->ppl.size = le16_to_cpu(sb->ppl.size); | |
1581 | rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset; | |
1582 | } | |
1583 | ||
9a7b2b0f | 1584 | if (!refdev) { |
8ed75463 | 1585 | ret = 1; |
9a7b2b0f | 1586 | } else { |
1da177e4 | 1587 | __u64 ev1, ev2; |
65a06f06 | 1588 | struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1589 | |
1590 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1591 | sb->level != refsb->level || | |
1592 | sb->layout != refsb->layout || | |
1593 | sb->chunksize != refsb->chunksize) { | |
9d48739e | 1594 | pr_warn("md: %s has strangely different superblock to %s\n", |
1da177e4 LT |
1595 | bdevname(rdev->bdev,b), |
1596 | bdevname(refdev->bdev,b2)); | |
1597 | return -EINVAL; | |
1598 | } | |
1599 | ev1 = le64_to_cpu(sb->events); | |
1600 | ev2 = le64_to_cpu(refsb->events); | |
1601 | ||
1602 | if (ev1 > ev2) | |
8ed75463 N |
1603 | ret = 1; |
1604 | else | |
1605 | ret = 0; | |
1da177e4 | 1606 | } |
c6563a8c N |
1607 | if (minor_version) { |
1608 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9); | |
1609 | sectors -= rdev->data_offset; | |
1610 | } else | |
1611 | sectors = rdev->sb_start; | |
1612 | if (sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1613 | return -EINVAL; |
dd8ac336 | 1614 | rdev->sectors = le64_to_cpu(sb->data_size); |
8ed75463 | 1615 | return ret; |
1da177e4 LT |
1616 | } |
1617 | ||
fd01b88c | 1618 | static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1619 | { |
65a06f06 | 1620 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
07d84d10 | 1621 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1622 | |
41158c7e | 1623 | rdev->raid_disk = -1; |
c5d79adb N |
1624 | clear_bit(Faulty, &rdev->flags); |
1625 | clear_bit(In_sync, &rdev->flags); | |
8313b8e5 | 1626 | clear_bit(Bitmap_sync, &rdev->flags); |
c5d79adb | 1627 | clear_bit(WriteMostly, &rdev->flags); |
c5d79adb | 1628 | |
1da177e4 LT |
1629 | if (mddev->raid_disks == 0) { |
1630 | mddev->major_version = 1; | |
1631 | mddev->patch_version = 0; | |
e691063a | 1632 | mddev->external = 0; |
9d8f0363 | 1633 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
9ebc6ef1 DD |
1634 | mddev->ctime = le64_to_cpu(sb->ctime); |
1635 | mddev->utime = le64_to_cpu(sb->utime); | |
1da177e4 | 1636 | mddev->level = le32_to_cpu(sb->level); |
d9d166c2 | 1637 | mddev->clevel[0] = 0; |
1da177e4 LT |
1638 | mddev->layout = le32_to_cpu(sb->layout); |
1639 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1640 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1641 | mddev->events = ev1; |
c3d9714e | 1642 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1643 | mddev->bitmap_info.space = 0; |
1644 | /* Default location for bitmap is 1K after superblock | |
1645 | * using 3K - total of 4K | |
1646 | */ | |
c3d9714e | 1647 | mddev->bitmap_info.default_offset = 1024 >> 9; |
6409bb05 | 1648 | mddev->bitmap_info.default_space = (4096-1024) >> 9; |
2c810cdd N |
1649 | mddev->reshape_backwards = 0; |
1650 | ||
1da177e4 LT |
1651 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); |
1652 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1653 | ||
1654 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1655 | |
71c0805c | 1656 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
6409bb05 | 1657 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1658 | mddev->bitmap_info.offset = |
1659 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
6409bb05 N |
1660 | /* Metadata doesn't record how much space is available. |
1661 | * For 1.0, we assume we can use up to the superblock | |
1662 | * if before, else to 4K beyond superblock. | |
1663 | * For others, assume no change is possible. | |
1664 | */ | |
1665 | if (mddev->minor_version > 0) | |
1666 | mddev->bitmap_info.space = 0; | |
1667 | else if (mddev->bitmap_info.offset > 0) | |
1668 | mddev->bitmap_info.space = | |
1669 | 8 - mddev->bitmap_info.offset; | |
1670 | else | |
1671 | mddev->bitmap_info.space = | |
1672 | -mddev->bitmap_info.offset; | |
1673 | } | |
e11e93fa | 1674 | |
f6705578 N |
1675 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1676 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1677 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1678 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1679 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1680 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
2c810cdd N |
1681 | if (mddev->delta_disks < 0 || |
1682 | (mddev->delta_disks == 0 && | |
1683 | (le32_to_cpu(sb->feature_map) | |
1684 | & MD_FEATURE_RESHAPE_BACKWARDS))) | |
1685 | mddev->reshape_backwards = 1; | |
f6705578 N |
1686 | } else { |
1687 | mddev->reshape_position = MaxSector; | |
1688 | mddev->delta_disks = 0; | |
1689 | mddev->new_level = mddev->level; | |
1690 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1691 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1692 | } |
1693 | ||
486b0f7b | 1694 | if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL) |
a62ab49e | 1695 | set_bit(MD_HAS_JOURNAL, &mddev->flags); |
ea0213e0 | 1696 | |
ddc08823 PB |
1697 | if (le32_to_cpu(sb->feature_map) & |
1698 | (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) { | |
ea0213e0 AP |
1699 | if (le32_to_cpu(sb->feature_map) & |
1700 | (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL)) | |
1701 | return -EINVAL; | |
ddc08823 PB |
1702 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) && |
1703 | (le32_to_cpu(sb->feature_map) & | |
1704 | MD_FEATURE_MULTIPLE_PPLS)) | |
1705 | return -EINVAL; | |
ea0213e0 AP |
1706 | set_bit(MD_HAS_PPL, &mddev->flags); |
1707 | } | |
41158c7e | 1708 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1709 | /* Insist of good event counter while assembling, except for |
1710 | * spares (which don't need an event count) */ | |
1da177e4 | 1711 | ++ev1; |
be6800a7 N |
1712 | if (rdev->desc_nr >= 0 && |
1713 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
a3dfbdaa SL |
1714 | (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX || |
1715 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)) | |
be6800a7 N |
1716 | if (ev1 < mddev->events) |
1717 | return -EINVAL; | |
41158c7e N |
1718 | } else if (mddev->bitmap) { |
1719 | /* If adding to array with a bitmap, then we can accept an | |
1720 | * older device, but not too old. | |
1721 | */ | |
41158c7e N |
1722 | if (ev1 < mddev->bitmap->events_cleared) |
1723 | return 0; | |
8313b8e5 N |
1724 | if (ev1 < mddev->events) |
1725 | set_bit(Bitmap_sync, &rdev->flags); | |
07d84d10 N |
1726 | } else { |
1727 | if (ev1 < mddev->events) | |
1728 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1729 | return 0; | |
1730 | } | |
1da177e4 LT |
1731 | if (mddev->level != LEVEL_MULTIPATH) { |
1732 | int role; | |
3673f305 N |
1733 | if (rdev->desc_nr < 0 || |
1734 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
c4d4c91b | 1735 | role = MD_DISK_ROLE_SPARE; |
3673f305 N |
1736 | rdev->desc_nr = -1; |
1737 | } else | |
1738 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 | 1739 | switch(role) { |
c4d4c91b | 1740 | case MD_DISK_ROLE_SPARE: /* spare */ |
1da177e4 | 1741 | break; |
c4d4c91b | 1742 | case MD_DISK_ROLE_FAULTY: /* faulty */ |
b2d444d7 | 1743 | set_bit(Faulty, &rdev->flags); |
1da177e4 | 1744 | break; |
bac624f3 SL |
1745 | case MD_DISK_ROLE_JOURNAL: /* journal device */ |
1746 | if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) { | |
1747 | /* journal device without journal feature */ | |
9d48739e | 1748 | pr_warn("md: journal device provided without journal feature, ignoring the device\n"); |
bac624f3 SL |
1749 | return -EINVAL; |
1750 | } | |
1751 | set_bit(Journal, &rdev->flags); | |
3069aa8d | 1752 | rdev->journal_tail = le64_to_cpu(sb->journal_tail); |
9b15603d | 1753 | rdev->raid_disk = 0; |
bac624f3 | 1754 | break; |
1da177e4 | 1755 | default: |
f466722c | 1756 | rdev->saved_raid_disk = role; |
5fd6c1dc | 1757 | if ((le32_to_cpu(sb->feature_map) & |
f466722c | 1758 | MD_FEATURE_RECOVERY_OFFSET)) { |
5fd6c1dc | 1759 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); |
f466722c N |
1760 | if (!(le32_to_cpu(sb->feature_map) & |
1761 | MD_FEATURE_RECOVERY_BITMAP)) | |
1762 | rdev->saved_raid_disk = -1; | |
1763 | } else | |
5fd6c1dc | 1764 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1765 | rdev->raid_disk = role; |
1766 | break; | |
1767 | } | |
8ddf9efe N |
1768 | if (sb->devflags & WriteMostly1) |
1769 | set_bit(WriteMostly, &rdev->flags); | |
688834e6 N |
1770 | if (sb->devflags & FailFast1) |
1771 | set_bit(FailFast, &rdev->flags); | |
2d78f8c4 N |
1772 | if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) |
1773 | set_bit(Replacement, &rdev->flags); | |
41158c7e | 1774 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1775 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1776 | |
1da177e4 LT |
1777 | return 0; |
1778 | } | |
1779 | ||
fd01b88c | 1780 | static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1781 | { |
1782 | struct mdp_superblock_1 *sb; | |
3cb03002 | 1783 | struct md_rdev *rdev2; |
1da177e4 LT |
1784 | int max_dev, i; |
1785 | /* make rdev->sb match mddev and rdev data. */ | |
1786 | ||
65a06f06 | 1787 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1788 | |
1789 | sb->feature_map = 0; | |
1790 | sb->pad0 = 0; | |
5fd6c1dc | 1791 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1792 | memset(sb->pad3, 0, sizeof(sb->pad3)); |
1793 | ||
1794 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1795 | sb->events = cpu_to_le64(mddev->events); | |
1796 | if (mddev->in_sync) | |
1797 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
bd18f646 SL |
1798 | else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags)) |
1799 | sb->resync_offset = cpu_to_le64(MaxSector); | |
1da177e4 LT |
1800 | else |
1801 | sb->resync_offset = cpu_to_le64(0); | |
1802 | ||
1c05b4bc | 1803 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1804 | |
f0ca340c | 1805 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1806 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1807 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1808 | sb->level = cpu_to_le32(mddev->level); |
1809 | sb->layout = cpu_to_le32(mddev->layout); | |
688834e6 N |
1810 | if (test_bit(FailFast, &rdev->flags)) |
1811 | sb->devflags |= FailFast1; | |
1812 | else | |
1813 | sb->devflags &= ~FailFast1; | |
f0ca340c | 1814 | |
aeb9b211 N |
1815 | if (test_bit(WriteMostly, &rdev->flags)) |
1816 | sb->devflags |= WriteMostly1; | |
1817 | else | |
1818 | sb->devflags &= ~WriteMostly1; | |
c6563a8c N |
1819 | sb->data_offset = cpu_to_le64(rdev->data_offset); |
1820 | sb->data_size = cpu_to_le64(rdev->sectors); | |
aeb9b211 | 1821 | |
c3d9714e N |
1822 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1823 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1824 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1825 | } |
5fd6c1dc | 1826 | |
f2076e7d | 1827 | if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) && |
97e4f42d | 1828 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1829 | sb->feature_map |= |
1830 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1831 | sb->recovery_offset = | |
1832 | cpu_to_le64(rdev->recovery_offset); | |
f466722c N |
1833 | if (rdev->saved_raid_disk >= 0 && mddev->bitmap) |
1834 | sb->feature_map |= | |
1835 | cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP); | |
5fd6c1dc | 1836 | } |
3069aa8d SL |
1837 | /* Note: recovery_offset and journal_tail share space */ |
1838 | if (test_bit(Journal, &rdev->flags)) | |
1839 | sb->journal_tail = cpu_to_le64(rdev->journal_tail); | |
2d78f8c4 N |
1840 | if (test_bit(Replacement, &rdev->flags)) |
1841 | sb->feature_map |= | |
1842 | cpu_to_le32(MD_FEATURE_REPLACEMENT); | |
5fd6c1dc | 1843 | |
f6705578 N |
1844 | if (mddev->reshape_position != MaxSector) { |
1845 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1846 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1847 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1848 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1849 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1850 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
2c810cdd N |
1851 | if (mddev->delta_disks == 0 && |
1852 | mddev->reshape_backwards) | |
1853 | sb->feature_map | |
1854 | |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS); | |
c6563a8c N |
1855 | if (rdev->new_data_offset != rdev->data_offset) { |
1856 | sb->feature_map | |
1857 | |= cpu_to_le32(MD_FEATURE_NEW_OFFSET); | |
1858 | sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset | |
1859 | - rdev->data_offset)); | |
1860 | } | |
f6705578 | 1861 | } |
a654b9d8 | 1862 | |
3c462c88 GR |
1863 | if (mddev_is_clustered(mddev)) |
1864 | sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED); | |
1865 | ||
2699b672 N |
1866 | if (rdev->badblocks.count == 0) |
1867 | /* Nothing to do for bad blocks*/ ; | |
1868 | else if (sb->bblog_offset == 0) | |
1869 | /* Cannot record bad blocks on this device */ | |
1870 | md_error(mddev, rdev); | |
1871 | else { | |
1872 | struct badblocks *bb = &rdev->badblocks; | |
1873 | u64 *bbp = (u64 *)page_address(rdev->bb_page); | |
1874 | u64 *p = bb->page; | |
1875 | sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); | |
1876 | if (bb->changed) { | |
1877 | unsigned seq; | |
1878 | ||
1879 | retry: | |
1880 | seq = read_seqbegin(&bb->lock); | |
1881 | ||
1882 | memset(bbp, 0xff, PAGE_SIZE); | |
1883 | ||
1884 | for (i = 0 ; i < bb->count ; i++) { | |
35f9ac2d | 1885 | u64 internal_bb = p[i]; |
2699b672 N |
1886 | u64 store_bb = ((BB_OFFSET(internal_bb) << 10) |
1887 | | BB_LEN(internal_bb)); | |
35f9ac2d | 1888 | bbp[i] = cpu_to_le64(store_bb); |
2699b672 | 1889 | } |
d0962936 | 1890 | bb->changed = 0; |
2699b672 N |
1891 | if (read_seqretry(&bb->lock, seq)) |
1892 | goto retry; | |
1893 | ||
1894 | bb->sector = (rdev->sb_start + | |
1895 | (int)le32_to_cpu(sb->bblog_offset)); | |
1896 | bb->size = le16_to_cpu(sb->bblog_size); | |
2699b672 N |
1897 | } |
1898 | } | |
1899 | ||
1da177e4 | 1900 | max_dev = 0; |
dafb20fa | 1901 | rdev_for_each(rdev2, mddev) |
1da177e4 LT |
1902 | if (rdev2->desc_nr+1 > max_dev) |
1903 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1904 | |
70471daf N |
1905 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1906 | int bmask; | |
a778b73f | 1907 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1908 | rdev->sb_size = max_dev * 2 + 256; |
1909 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1910 | if (rdev->sb_size & bmask) | |
1911 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1912 | } else |
1913 | max_dev = le32_to_cpu(sb->max_dev); | |
1914 | ||
1da177e4 | 1915 | for (i=0; i<max_dev;i++) |
8df72024 | 1916 | sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE); |
f72ffdd6 | 1917 | |
a97b7896 SL |
1918 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) |
1919 | sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL); | |
f72ffdd6 | 1920 | |
ea0213e0 | 1921 | if (test_bit(MD_HAS_PPL, &mddev->flags)) { |
ddc08823 PB |
1922 | if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags)) |
1923 | sb->feature_map |= | |
1924 | cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS); | |
1925 | else | |
1926 | sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL); | |
ea0213e0 AP |
1927 | sb->ppl.offset = cpu_to_le16(rdev->ppl.offset); |
1928 | sb->ppl.size = cpu_to_le16(rdev->ppl.size); | |
1929 | } | |
1930 | ||
dafb20fa | 1931 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1932 | i = rdev2->desc_nr; |
b2d444d7 | 1933 | if (test_bit(Faulty, &rdev2->flags)) |
c4d4c91b | 1934 | sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY); |
b2d444d7 | 1935 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1936 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
a97b7896 | 1937 | else if (test_bit(Journal, &rdev2->flags)) |
bac624f3 | 1938 | sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL); |
93be75ff | 1939 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1940 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 | 1941 | else |
c4d4c91b | 1942 | sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE); |
1da177e4 LT |
1943 | } |
1944 | ||
1da177e4 LT |
1945 | sb->sb_csum = calc_sb_1_csum(sb); |
1946 | } | |
1947 | ||
0cd17fec | 1948 | static unsigned long long |
3cb03002 | 1949 | super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec CW |
1950 | { |
1951 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1952 | sector_t max_sectors; |
58c0fed4 | 1953 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1954 | return 0; /* component must fit device */ |
c6563a8c N |
1955 | if (rdev->data_offset != rdev->new_data_offset) |
1956 | return 0; /* too confusing */ | |
0f420358 | 1957 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1958 | /* minor versions 1 and 2; superblock before data */ |
77304d2a | 1959 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
15f4a5fd AN |
1960 | max_sectors -= rdev->data_offset; |
1961 | if (!num_sectors || num_sectors > max_sectors) | |
1962 | num_sectors = max_sectors; | |
c3d9714e | 1963 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1964 | /* minor version 0 with bitmap we can't move */ |
1965 | return 0; | |
1966 | } else { | |
1967 | /* minor version 0; superblock after data */ | |
0f420358 | 1968 | sector_t sb_start; |
77304d2a | 1969 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
0f420358 | 1970 | sb_start &= ~(sector_t)(4*2 - 1); |
dd8ac336 | 1971 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1972 | if (!num_sectors || num_sectors > max_sectors) |
1973 | num_sectors = max_sectors; | |
0f420358 | 1974 | rdev->sb_start = sb_start; |
0cd17fec | 1975 | } |
65a06f06 | 1976 | sb = page_address(rdev->sb_page); |
15f4a5fd | 1977 | sb->data_size = cpu_to_le64(num_sectors); |
3fb632e4 | 1978 | sb->super_offset = cpu_to_le64(rdev->sb_start); |
0cd17fec | 1979 | sb->sb_csum = calc_sb_1_csum(sb); |
46533ff7 N |
1980 | do { |
1981 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, | |
1982 | rdev->sb_page); | |
1983 | } while (md_super_wait(rdev->mddev) < 0); | |
c26a44ed | 1984 | return num_sectors; |
c6563a8c N |
1985 | |
1986 | } | |
1987 | ||
1988 | static int | |
1989 | super_1_allow_new_offset(struct md_rdev *rdev, | |
1990 | unsigned long long new_offset) | |
1991 | { | |
1992 | /* All necessary checks on new >= old have been done */ | |
1993 | struct bitmap *bitmap; | |
1994 | if (new_offset >= rdev->data_offset) | |
1995 | return 1; | |
1996 | ||
1997 | /* with 1.0 metadata, there is no metadata to tread on | |
1998 | * so we can always move back */ | |
1999 | if (rdev->mddev->minor_version == 0) | |
2000 | return 1; | |
2001 | ||
2002 | /* otherwise we must be sure not to step on | |
2003 | * any metadata, so stay: | |
2004 | * 36K beyond start of superblock | |
2005 | * beyond end of badblocks | |
2006 | * beyond write-intent bitmap | |
2007 | */ | |
2008 | if (rdev->sb_start + (32+4)*2 > new_offset) | |
2009 | return 0; | |
2010 | bitmap = rdev->mddev->bitmap; | |
2011 | if (bitmap && !rdev->mddev->bitmap_info.file && | |
2012 | rdev->sb_start + rdev->mddev->bitmap_info.offset + | |
1ec885cd | 2013 | bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset) |
c6563a8c N |
2014 | return 0; |
2015 | if (rdev->badblocks.sector + rdev->badblocks.size > new_offset) | |
2016 | return 0; | |
2017 | ||
2018 | return 1; | |
0cd17fec | 2019 | } |
1da177e4 | 2020 | |
75c96f85 | 2021 | static struct super_type super_types[] = { |
1da177e4 LT |
2022 | [0] = { |
2023 | .name = "0.90.0", | |
2024 | .owner = THIS_MODULE, | |
0cd17fec CW |
2025 | .load_super = super_90_load, |
2026 | .validate_super = super_90_validate, | |
2027 | .sync_super = super_90_sync, | |
2028 | .rdev_size_change = super_90_rdev_size_change, | |
c6563a8c | 2029 | .allow_new_offset = super_90_allow_new_offset, |
1da177e4 LT |
2030 | }, |
2031 | [1] = { | |
2032 | .name = "md-1", | |
2033 | .owner = THIS_MODULE, | |
0cd17fec CW |
2034 | .load_super = super_1_load, |
2035 | .validate_super = super_1_validate, | |
2036 | .sync_super = super_1_sync, | |
2037 | .rdev_size_change = super_1_rdev_size_change, | |
c6563a8c | 2038 | .allow_new_offset = super_1_allow_new_offset, |
1da177e4 LT |
2039 | }, |
2040 | }; | |
1da177e4 | 2041 | |
fd01b88c | 2042 | static void sync_super(struct mddev *mddev, struct md_rdev *rdev) |
076f968b JB |
2043 | { |
2044 | if (mddev->sync_super) { | |
2045 | mddev->sync_super(mddev, rdev); | |
2046 | return; | |
2047 | } | |
2048 | ||
2049 | BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); | |
2050 | ||
2051 | super_types[mddev->major_version].sync_super(mddev, rdev); | |
2052 | } | |
2053 | ||
fd01b88c | 2054 | static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) |
1da177e4 | 2055 | { |
3cb03002 | 2056 | struct md_rdev *rdev, *rdev2; |
1da177e4 | 2057 | |
4b80991c | 2058 | rcu_read_lock(); |
0b020e85 SL |
2059 | rdev_for_each_rcu(rdev, mddev1) { |
2060 | if (test_bit(Faulty, &rdev->flags) || | |
2061 | test_bit(Journal, &rdev->flags) || | |
2062 | rdev->raid_disk == -1) | |
2063 | continue; | |
2064 | rdev_for_each_rcu(rdev2, mddev2) { | |
2065 | if (test_bit(Faulty, &rdev2->flags) || | |
2066 | test_bit(Journal, &rdev2->flags) || | |
2067 | rdev2->raid_disk == -1) | |
2068 | continue; | |
7dd5e7c3 | 2069 | if (rdev->bdev->bd_contains == |
4b80991c N |
2070 | rdev2->bdev->bd_contains) { |
2071 | rcu_read_unlock(); | |
7dd5e7c3 | 2072 | return 1; |
4b80991c | 2073 | } |
0b020e85 SL |
2074 | } |
2075 | } | |
4b80991c | 2076 | rcu_read_unlock(); |
1da177e4 LT |
2077 | return 0; |
2078 | } | |
2079 | ||
2080 | static LIST_HEAD(pending_raid_disks); | |
2081 | ||
ac5e7113 AN |
2082 | /* |
2083 | * Try to register data integrity profile for an mddev | |
2084 | * | |
2085 | * This is called when an array is started and after a disk has been kicked | |
2086 | * from the array. It only succeeds if all working and active component devices | |
2087 | * are integrity capable with matching profiles. | |
2088 | */ | |
fd01b88c | 2089 | int md_integrity_register(struct mddev *mddev) |
ac5e7113 | 2090 | { |
3cb03002 | 2091 | struct md_rdev *rdev, *reference = NULL; |
ac5e7113 AN |
2092 | |
2093 | if (list_empty(&mddev->disks)) | |
2094 | return 0; /* nothing to do */ | |
629acb6a JB |
2095 | if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) |
2096 | return 0; /* shouldn't register, or already is */ | |
dafb20fa | 2097 | rdev_for_each(rdev, mddev) { |
ac5e7113 AN |
2098 | /* skip spares and non-functional disks */ |
2099 | if (test_bit(Faulty, &rdev->flags)) | |
2100 | continue; | |
2101 | if (rdev->raid_disk < 0) | |
2102 | continue; | |
ac5e7113 AN |
2103 | if (!reference) { |
2104 | /* Use the first rdev as the reference */ | |
2105 | reference = rdev; | |
2106 | continue; | |
2107 | } | |
2108 | /* does this rdev's profile match the reference profile? */ | |
2109 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
2110 | rdev->bdev->bd_disk) < 0) | |
2111 | return -EINVAL; | |
2112 | } | |
89078d57 MP |
2113 | if (!reference || !bdev_get_integrity(reference->bdev)) |
2114 | return 0; | |
ac5e7113 AN |
2115 | /* |
2116 | * All component devices are integrity capable and have matching | |
2117 | * profiles, register the common profile for the md device. | |
2118 | */ | |
25520d55 MP |
2119 | blk_integrity_register(mddev->gendisk, |
2120 | bdev_get_integrity(reference->bdev)); | |
2121 | ||
9d48739e | 2122 | pr_debug("md: data integrity enabled on %s\n", mdname(mddev)); |
a91a2785 | 2123 | if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { |
9d48739e | 2124 | pr_err("md: failed to create integrity pool for %s\n", |
a91a2785 MP |
2125 | mdname(mddev)); |
2126 | return -EINVAL; | |
2127 | } | |
ac5e7113 AN |
2128 | return 0; |
2129 | } | |
2130 | EXPORT_SYMBOL(md_integrity_register); | |
2131 | ||
1501efad DW |
2132 | /* |
2133 | * Attempt to add an rdev, but only if it is consistent with the current | |
2134 | * integrity profile | |
2135 | */ | |
2136 | int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) | |
3f9d99c1 | 2137 | { |
2863b9eb JB |
2138 | struct blk_integrity *bi_rdev; |
2139 | struct blk_integrity *bi_mddev; | |
1501efad | 2140 | char name[BDEVNAME_SIZE]; |
2863b9eb JB |
2141 | |
2142 | if (!mddev->gendisk) | |
1501efad | 2143 | return 0; |
2863b9eb JB |
2144 | |
2145 | bi_rdev = bdev_get_integrity(rdev->bdev); | |
2146 | bi_mddev = blk_get_integrity(mddev->gendisk); | |
3f9d99c1 | 2147 | |
ac5e7113 | 2148 | if (!bi_mddev) /* nothing to do */ |
1501efad DW |
2149 | return 0; |
2150 | ||
2151 | if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) { | |
9d48739e N |
2152 | pr_err("%s: incompatible integrity profile for %s\n", |
2153 | mdname(mddev), bdevname(rdev->bdev, name)); | |
1501efad DW |
2154 | return -ENXIO; |
2155 | } | |
2156 | ||
2157 | return 0; | |
3f9d99c1 | 2158 | } |
ac5e7113 | 2159 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 2160 | |
f72ffdd6 | 2161 | static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) |
1da177e4 | 2162 | { |
7dd5e7c3 | 2163 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 2164 | struct kobject *ko; |
5e55e2f5 | 2165 | int err; |
1da177e4 | 2166 | |
11e2ede0 DW |
2167 | /* prevent duplicates */ |
2168 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
2169 | return -EEXIST; | |
2170 | ||
97b20ef7 N |
2171 | if ((bdev_read_only(rdev->bdev) || bdev_read_only(rdev->meta_bdev)) && |
2172 | mddev->pers) | |
2173 | return -EROFS; | |
2174 | ||
dd8ac336 | 2175 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
f6b6ec5c SL |
2176 | if (!test_bit(Journal, &rdev->flags) && |
2177 | rdev->sectors && | |
2178 | (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
2179 | if (mddev->pers) { |
2180 | /* Cannot change size, so fail | |
2181 | * If mddev->level <= 0, then we don't care | |
2182 | * about aligning sizes (e.g. linear) | |
2183 | */ | |
2184 | if (mddev->level > 0) | |
2185 | return -ENOSPC; | |
2186 | } else | |
dd8ac336 | 2187 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 2188 | } |
1da177e4 LT |
2189 | |
2190 | /* Verify rdev->desc_nr is unique. | |
2191 | * If it is -1, assign a free number, else | |
2192 | * check number is not in use | |
2193 | */ | |
4878e9eb | 2194 | rcu_read_lock(); |
1da177e4 LT |
2195 | if (rdev->desc_nr < 0) { |
2196 | int choice = 0; | |
4878e9eb N |
2197 | if (mddev->pers) |
2198 | choice = mddev->raid_disks; | |
57d051dc | 2199 | while (md_find_rdev_nr_rcu(mddev, choice)) |
1da177e4 LT |
2200 | choice++; |
2201 | rdev->desc_nr = choice; | |
2202 | } else { | |
57d051dc | 2203 | if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) { |
4878e9eb | 2204 | rcu_read_unlock(); |
1da177e4 | 2205 | return -EBUSY; |
4878e9eb | 2206 | } |
1da177e4 | 2207 | } |
4878e9eb | 2208 | rcu_read_unlock(); |
f6b6ec5c SL |
2209 | if (!test_bit(Journal, &rdev->flags) && |
2210 | mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { | |
9d48739e N |
2211 | pr_warn("md: %s: array is limited to %d devices\n", |
2212 | mdname(mddev), mddev->max_disks); | |
de01dfad N |
2213 | return -EBUSY; |
2214 | } | |
19133a42 | 2215 | bdevname(rdev->bdev,b); |
90a9befb | 2216 | strreplace(b, '/', '!'); |
649316b2 | 2217 | |
1da177e4 | 2218 | rdev->mddev = mddev; |
9d48739e | 2219 | pr_debug("md: bind<%s>\n", b); |
86e6ffdd | 2220 | |
b2d6db58 | 2221 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 2222 | goto fail; |
86e6ffdd | 2223 | |
0762b8bd | 2224 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
2225 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
2226 | /* failure here is OK */; | |
2227 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 2228 | |
4b80991c | 2229 | list_add_rcu(&rdev->same_set, &mddev->disks); |
e09b457b | 2230 | bd_link_disk_holder(rdev->bdev, mddev->gendisk); |
4044ba58 N |
2231 | |
2232 | /* May as well allow recovery to be retried once */ | |
5389042f | 2233 | mddev->recovery_disabled++; |
3f9d99c1 | 2234 | |
1da177e4 | 2235 | return 0; |
5e55e2f5 N |
2236 | |
2237 | fail: | |
9d48739e N |
2238 | pr_warn("md: failed to register dev-%s for %s\n", |
2239 | b, mdname(mddev)); | |
5e55e2f5 | 2240 | return err; |
1da177e4 LT |
2241 | } |
2242 | ||
177a99b2 | 2243 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 | 2244 | { |
3cb03002 | 2245 | struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); |
5792a285 | 2246 | kobject_del(&rdev->kobj); |
177a99b2 | 2247 | kobject_put(&rdev->kobj); |
5792a285 N |
2248 | } |
2249 | ||
f72ffdd6 | 2250 | static void unbind_rdev_from_array(struct md_rdev *rdev) |
1da177e4 LT |
2251 | { |
2252 | char b[BDEVNAME_SIZE]; | |
403df478 | 2253 | |
49731baa | 2254 | bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 2255 | list_del_rcu(&rdev->same_set); |
9d48739e | 2256 | pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
1da177e4 | 2257 | rdev->mddev = NULL; |
86e6ffdd | 2258 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
2259 | sysfs_put(rdev->sysfs_state); |
2260 | rdev->sysfs_state = NULL; | |
2230dfe4 | 2261 | rdev->badblocks.count = 0; |
5792a285 | 2262 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
2263 | * writing to 'remove' to "dev/state". We also need |
2264 | * to delay it due to rcu usage. | |
5792a285 | 2265 | */ |
4b80991c | 2266 | synchronize_rcu(); |
177a99b2 N |
2267 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
2268 | kobject_get(&rdev->kobj); | |
e804ac78 | 2269 | queue_work(md_misc_wq, &rdev->del_work); |
1da177e4 LT |
2270 | } |
2271 | ||
2272 | /* | |
2273 | * prevent the device from being mounted, repartitioned or | |
2274 | * otherwise reused by a RAID array (or any other kernel | |
2275 | * subsystem), by bd_claiming the device. | |
2276 | */ | |
3cb03002 | 2277 | static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) |
1da177e4 LT |
2278 | { |
2279 | int err = 0; | |
2280 | struct block_device *bdev; | |
2281 | char b[BDEVNAME_SIZE]; | |
2282 | ||
d4d77629 | 2283 | bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
3cb03002 | 2284 | shared ? (struct md_rdev *)lock_rdev : rdev); |
1da177e4 | 2285 | if (IS_ERR(bdev)) { |
9d48739e | 2286 | pr_warn("md: could not open %s.\n", __bdevname(dev, b)); |
1da177e4 LT |
2287 | return PTR_ERR(bdev); |
2288 | } | |
1da177e4 LT |
2289 | rdev->bdev = bdev; |
2290 | return err; | |
2291 | } | |
2292 | ||
3cb03002 | 2293 | static void unlock_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2294 | { |
2295 | struct block_device *bdev = rdev->bdev; | |
2296 | rdev->bdev = NULL; | |
e525fd89 | 2297 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
2298 | } |
2299 | ||
2300 | void md_autodetect_dev(dev_t dev); | |
2301 | ||
f72ffdd6 | 2302 | static void export_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2303 | { |
2304 | char b[BDEVNAME_SIZE]; | |
403df478 | 2305 | |
9d48739e | 2306 | pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b)); |
545c8795 | 2307 | md_rdev_clear(rdev); |
1da177e4 | 2308 | #ifndef MODULE |
d0fae18f N |
2309 | if (test_bit(AutoDetected, &rdev->flags)) |
2310 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
2311 | #endif |
2312 | unlock_rdev(rdev); | |
86e6ffdd | 2313 | kobject_put(&rdev->kobj); |
1da177e4 LT |
2314 | } |
2315 | ||
fb56dfef | 2316 | void md_kick_rdev_from_array(struct md_rdev *rdev) |
1da177e4 LT |
2317 | { |
2318 | unbind_rdev_from_array(rdev); | |
2319 | export_rdev(rdev); | |
2320 | } | |
fb56dfef | 2321 | EXPORT_SYMBOL_GPL(md_kick_rdev_from_array); |
1da177e4 | 2322 | |
fd01b88c | 2323 | static void export_array(struct mddev *mddev) |
1da177e4 | 2324 | { |
0638bb0e | 2325 | struct md_rdev *rdev; |
1da177e4 | 2326 | |
0638bb0e N |
2327 | while (!list_empty(&mddev->disks)) { |
2328 | rdev = list_first_entry(&mddev->disks, struct md_rdev, | |
2329 | same_set); | |
fb56dfef | 2330 | md_kick_rdev_from_array(rdev); |
1da177e4 | 2331 | } |
1da177e4 LT |
2332 | mddev->raid_disks = 0; |
2333 | mddev->major_version = 0; | |
2334 | } | |
2335 | ||
6497709b N |
2336 | static bool set_in_sync(struct mddev *mddev) |
2337 | { | |
ed9b66d2 | 2338 | WARN_ON_ONCE(NR_CPUS != 1 && !spin_is_locked(&mddev->lock)); |
4ad23a97 N |
2339 | if (!mddev->in_sync) { |
2340 | mddev->sync_checkers++; | |
2341 | spin_unlock(&mddev->lock); | |
2342 | percpu_ref_switch_to_atomic_sync(&mddev->writes_pending); | |
2343 | spin_lock(&mddev->lock); | |
2344 | if (!mddev->in_sync && | |
2345 | percpu_ref_is_zero(&mddev->writes_pending)) { | |
6497709b | 2346 | mddev->in_sync = 1; |
4ad23a97 N |
2347 | /* |
2348 | * Ensure ->in_sync is visible before we clear | |
2349 | * ->sync_checkers. | |
2350 | */ | |
55cc39f3 | 2351 | smp_mb(); |
6497709b N |
2352 | set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); |
2353 | sysfs_notify_dirent_safe(mddev->sysfs_state); | |
2354 | } | |
4ad23a97 N |
2355 | if (--mddev->sync_checkers == 0) |
2356 | percpu_ref_switch_to_percpu(&mddev->writes_pending); | |
6497709b N |
2357 | } |
2358 | if (mddev->safemode == 1) | |
2359 | mddev->safemode = 0; | |
2360 | return mddev->in_sync; | |
2361 | } | |
2362 | ||
f72ffdd6 | 2363 | static void sync_sbs(struct mddev *mddev, int nospares) |
1da177e4 | 2364 | { |
42543769 N |
2365 | /* Update each superblock (in-memory image), but |
2366 | * if we are allowed to, skip spares which already | |
2367 | * have the right event counter, or have one earlier | |
2368 | * (which would mean they aren't being marked as dirty | |
2369 | * with the rest of the array) | |
2370 | */ | |
3cb03002 | 2371 | struct md_rdev *rdev; |
dafb20fa | 2372 | rdev_for_each(rdev, mddev) { |
42543769 N |
2373 | if (rdev->sb_events == mddev->events || |
2374 | (nospares && | |
2375 | rdev->raid_disk < 0 && | |
42543769 N |
2376 | rdev->sb_events+1 == mddev->events)) { |
2377 | /* Don't update this superblock */ | |
2378 | rdev->sb_loaded = 2; | |
2379 | } else { | |
076f968b | 2380 | sync_super(mddev, rdev); |
42543769 N |
2381 | rdev->sb_loaded = 1; |
2382 | } | |
1da177e4 LT |
2383 | } |
2384 | } | |
2385 | ||
2aa82191 GR |
2386 | static bool does_sb_need_changing(struct mddev *mddev) |
2387 | { | |
2388 | struct md_rdev *rdev; | |
2389 | struct mdp_superblock_1 *sb; | |
2390 | int role; | |
2391 | ||
2392 | /* Find a good rdev */ | |
2393 | rdev_for_each(rdev, mddev) | |
2394 | if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags)) | |
2395 | break; | |
2396 | ||
2397 | /* No good device found. */ | |
2398 | if (!rdev) | |
2399 | return false; | |
2400 | ||
2401 | sb = page_address(rdev->sb_page); | |
2402 | /* Check if a device has become faulty or a spare become active */ | |
2403 | rdev_for_each(rdev, mddev) { | |
2404 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
2405 | /* Device activated? */ | |
2406 | if (role == 0xffff && rdev->raid_disk >=0 && | |
2407 | !test_bit(Faulty, &rdev->flags)) | |
2408 | return true; | |
2409 | /* Device turned faulty? */ | |
2410 | if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd)) | |
2411 | return true; | |
2412 | } | |
2413 | ||
2414 | /* Check if any mddev parameters have changed */ | |
2415 | if ((mddev->dev_sectors != le64_to_cpu(sb->size)) || | |
2416 | (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) || | |
13459213 | 2417 | (mddev->layout != le32_to_cpu(sb->layout)) || |
2aa82191 GR |
2418 | (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) || |
2419 | (mddev->chunk_sectors != le32_to_cpu(sb->chunksize))) | |
2420 | return true; | |
2421 | ||
2422 | return false; | |
2423 | } | |
2424 | ||
1aee41f6 | 2425 | void md_update_sb(struct mddev *mddev, int force_change) |
1da177e4 | 2426 | { |
3cb03002 | 2427 | struct md_rdev *rdev; |
06d91a5f | 2428 | int sync_req; |
42543769 | 2429 | int nospares = 0; |
2699b672 | 2430 | int any_badblocks_changed = 0; |
23b63f9f | 2431 | int ret = -1; |
1da177e4 | 2432 | |
d87f064f N |
2433 | if (mddev->ro) { |
2434 | if (force_change) | |
2953079c | 2435 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
d87f064f N |
2436 | return; |
2437 | } | |
2aa82191 | 2438 | |
2c97cf13 | 2439 | repeat: |
2aa82191 | 2440 | if (mddev_is_clustered(mddev)) { |
2953079c | 2441 | if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) |
2aa82191 | 2442 | force_change = 1; |
2953079c | 2443 | if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags)) |
85ad1d13 | 2444 | nospares = 1; |
23b63f9f | 2445 | ret = md_cluster_ops->metadata_update_start(mddev); |
2aa82191 GR |
2446 | /* Has someone else has updated the sb */ |
2447 | if (!does_sb_need_changing(mddev)) { | |
23b63f9f GJ |
2448 | if (ret == 0) |
2449 | md_cluster_ops->metadata_update_cancel(mddev); | |
2953079c SL |
2450 | bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING), |
2451 | BIT(MD_SB_CHANGE_DEVS) | | |
2452 | BIT(MD_SB_CHANGE_CLEAN)); | |
2aa82191 GR |
2453 | return; |
2454 | } | |
2455 | } | |
2c97cf13 | 2456 | |
3a3a5ddb | 2457 | /* First make sure individual recovery_offsets are correct */ |
dafb20fa | 2458 | rdev_for_each(rdev, mddev) { |
3a3a5ddb N |
2459 | if (rdev->raid_disk >= 0 && |
2460 | mddev->delta_disks >= 0 && | |
f2076e7d | 2461 | !test_bit(Journal, &rdev->flags) && |
3a3a5ddb N |
2462 | !test_bit(In_sync, &rdev->flags) && |
2463 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2464 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2465 | ||
f72ffdd6 | 2466 | } |
bd52b746 | 2467 | if (!mddev->persistent) { |
2953079c SL |
2468 | clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); |
2469 | clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); | |
de393cde | 2470 | if (!mddev->external) { |
2953079c | 2471 | clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); |
dafb20fa | 2472 | rdev_for_each(rdev, mddev) { |
de393cde | 2473 | if (rdev->badblocks.changed) { |
d0962936 | 2474 | rdev->badblocks.changed = 0; |
fc974ee2 | 2475 | ack_all_badblocks(&rdev->badblocks); |
de393cde N |
2476 | md_error(mddev, rdev); |
2477 | } | |
2478 | clear_bit(Blocked, &rdev->flags); | |
2479 | clear_bit(BlockedBadBlocks, &rdev->flags); | |
2480 | wake_up(&rdev->blocked_wait); | |
2481 | } | |
2482 | } | |
3a3a5ddb N |
2483 | wake_up(&mddev->sb_wait); |
2484 | return; | |
2485 | } | |
2486 | ||
85572d7c | 2487 | spin_lock(&mddev->lock); |
84692195 | 2488 | |
9ebc6ef1 | 2489 | mddev->utime = ktime_get_real_seconds(); |
3a3a5ddb | 2490 | |
2953079c | 2491 | if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) |
850b2b42 | 2492 | force_change = 1; |
2953079c | 2493 | if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags)) |
850b2b42 N |
2494 | /* just a clean<-> dirty transition, possibly leave spares alone, |
2495 | * though if events isn't the right even/odd, we will have to do | |
2496 | * spares after all | |
2497 | */ | |
2498 | nospares = 1; | |
2499 | if (force_change) | |
2500 | nospares = 0; | |
2501 | if (mddev->degraded) | |
84692195 N |
2502 | /* If the array is degraded, then skipping spares is both |
2503 | * dangerous and fairly pointless. | |
2504 | * Dangerous because a device that was removed from the array | |
2505 | * might have a event_count that still looks up-to-date, | |
2506 | * so it can be re-added without a resync. | |
2507 | * Pointless because if there are any spares to skip, | |
2508 | * then a recovery will happen and soon that array won't | |
2509 | * be degraded any more and the spare can go back to sleep then. | |
2510 | */ | |
850b2b42 | 2511 | nospares = 0; |
84692195 | 2512 | |
06d91a5f | 2513 | sync_req = mddev->in_sync; |
42543769 N |
2514 | |
2515 | /* If this is just a dirty<->clean transition, and the array is clean | |
2516 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2517 | if (nospares |
42543769 | 2518 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2519 | && mddev->can_decrease_events |
2520 | && mddev->events != 1) { | |
42543769 | 2521 | mddev->events--; |
a8707c08 N |
2522 | mddev->can_decrease_events = 0; |
2523 | } else { | |
42543769 N |
2524 | /* otherwise we have to go forward and ... */ |
2525 | mddev->events ++; | |
a8707c08 | 2526 | mddev->can_decrease_events = nospares; |
42543769 | 2527 | } |
1da177e4 | 2528 | |
403df478 N |
2529 | /* |
2530 | * This 64-bit counter should never wrap. | |
2531 | * Either we are in around ~1 trillion A.C., assuming | |
2532 | * 1 reboot per second, or we have a bug... | |
2533 | */ | |
2534 | WARN_ON(mddev->events == 0); | |
2699b672 | 2535 | |
dafb20fa | 2536 | rdev_for_each(rdev, mddev) { |
2699b672 N |
2537 | if (rdev->badblocks.changed) |
2538 | any_badblocks_changed++; | |
de393cde N |
2539 | if (test_bit(Faulty, &rdev->flags)) |
2540 | set_bit(FaultRecorded, &rdev->flags); | |
2541 | } | |
2699b672 | 2542 | |
e691063a | 2543 | sync_sbs(mddev, nospares); |
85572d7c | 2544 | spin_unlock(&mddev->lock); |
1da177e4 | 2545 | |
36a4e1fe N |
2546 | pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", |
2547 | mdname(mddev), mddev->in_sync); | |
1da177e4 | 2548 | |
504634f6 SL |
2549 | if (mddev->queue) |
2550 | blk_add_trace_msg(mddev->queue, "md md_update_sb"); | |
46533ff7 | 2551 | rewrite: |
4ad13663 | 2552 | bitmap_update_sb(mddev->bitmap); |
dafb20fa | 2553 | rdev_for_each(rdev, mddev) { |
1da177e4 | 2554 | char b[BDEVNAME_SIZE]; |
36a4e1fe | 2555 | |
42543769 N |
2556 | if (rdev->sb_loaded != 1) |
2557 | continue; /* no noise on spare devices */ | |
1da177e4 | 2558 | |
f466722c | 2559 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2560 | md_super_write(mddev,rdev, |
0f420358 | 2561 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 | 2562 | rdev->sb_page); |
36a4e1fe N |
2563 | pr_debug("md: (write) %s's sb offset: %llu\n", |
2564 | bdevname(rdev->bdev, b), | |
2565 | (unsigned long long)rdev->sb_start); | |
42543769 | 2566 | rdev->sb_events = mddev->events; |
2699b672 N |
2567 | if (rdev->badblocks.size) { |
2568 | md_super_write(mddev, rdev, | |
2569 | rdev->badblocks.sector, | |
2570 | rdev->badblocks.size << 9, | |
2571 | rdev->bb_page); | |
2572 | rdev->badblocks.size = 0; | |
2573 | } | |
7bfa19f2 | 2574 | |
f466722c | 2575 | } else |
36a4e1fe N |
2576 | pr_debug("md: %s (skipping faulty)\n", |
2577 | bdevname(rdev->bdev, b)); | |
d70ed2e4 | 2578 | |
7bfa19f2 | 2579 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2580 | /* only need to write one superblock... */ |
2581 | break; | |
2582 | } | |
46533ff7 N |
2583 | if (md_super_wait(mddev) < 0) |
2584 | goto rewrite; | |
2953079c | 2585 | /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2586 | |
2c97cf13 GJ |
2587 | if (mddev_is_clustered(mddev) && ret == 0) |
2588 | md_cluster_ops->metadata_update_finish(mddev); | |
2589 | ||
850b2b42 | 2590 | if (mddev->in_sync != sync_req || |
2953079c SL |
2591 | !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING), |
2592 | BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN))) | |
06d91a5f | 2593 | /* have to write it out again */ |
06d91a5f | 2594 | goto repeat; |
3d310eb7 | 2595 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2596 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2597 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2598 | |
dafb20fa | 2599 | rdev_for_each(rdev, mddev) { |
de393cde N |
2600 | if (test_and_clear_bit(FaultRecorded, &rdev->flags)) |
2601 | clear_bit(Blocked, &rdev->flags); | |
2602 | ||
2603 | if (any_badblocks_changed) | |
fc974ee2 | 2604 | ack_all_badblocks(&rdev->badblocks); |
de393cde N |
2605 | clear_bit(BlockedBadBlocks, &rdev->flags); |
2606 | wake_up(&rdev->blocked_wait); | |
2607 | } | |
1da177e4 | 2608 | } |
1aee41f6 | 2609 | EXPORT_SYMBOL(md_update_sb); |
1da177e4 | 2610 | |
a6da4ef8 GR |
2611 | static int add_bound_rdev(struct md_rdev *rdev) |
2612 | { | |
2613 | struct mddev *mddev = rdev->mddev; | |
2614 | int err = 0; | |
87d4d916 | 2615 | bool add_journal = test_bit(Journal, &rdev->flags); |
a6da4ef8 | 2616 | |
87d4d916 | 2617 | if (!mddev->pers->hot_remove_disk || add_journal) { |
a6da4ef8 GR |
2618 | /* If there is hot_add_disk but no hot_remove_disk |
2619 | * then added disks for geometry changes, | |
2620 | * and should be added immediately. | |
2621 | */ | |
2622 | super_types[mddev->major_version]. | |
2623 | validate_super(mddev, rdev); | |
87d4d916 SL |
2624 | if (add_journal) |
2625 | mddev_suspend(mddev); | |
a6da4ef8 | 2626 | err = mddev->pers->hot_add_disk(mddev, rdev); |
87d4d916 SL |
2627 | if (add_journal) |
2628 | mddev_resume(mddev); | |
a6da4ef8 | 2629 | if (err) { |
db767672 | 2630 | md_kick_rdev_from_array(rdev); |
a6da4ef8 GR |
2631 | return err; |
2632 | } | |
2633 | } | |
2634 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
2635 | ||
2953079c | 2636 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
a6da4ef8 GR |
2637 | if (mddev->degraded) |
2638 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
2639 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2640 | md_new_event(mddev); | |
2641 | md_wakeup_thread(mddev->thread); | |
2642 | return 0; | |
2643 | } | |
1da177e4 | 2644 | |
7f6ce769 | 2645 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2646 | * We want to accept with case. For this we use cmd_match. |
2647 | */ | |
2648 | static int cmd_match(const char *cmd, const char *str) | |
2649 | { | |
2650 | /* See if cmd, written into a sysfs file, matches | |
2651 | * str. They must either be the same, or cmd can | |
2652 | * have a trailing newline | |
2653 | */ | |
2654 | while (*cmd && *str && *cmd == *str) { | |
2655 | cmd++; | |
2656 | str++; | |
2657 | } | |
2658 | if (*cmd == '\n') | |
2659 | cmd++; | |
2660 | if (*str || *cmd) | |
2661 | return 0; | |
2662 | return 1; | |
2663 | } | |
2664 | ||
86e6ffdd N |
2665 | struct rdev_sysfs_entry { |
2666 | struct attribute attr; | |
3cb03002 N |
2667 | ssize_t (*show)(struct md_rdev *, char *); |
2668 | ssize_t (*store)(struct md_rdev *, const char *, size_t); | |
86e6ffdd N |
2669 | }; |
2670 | ||
2671 | static ssize_t | |
3cb03002 | 2672 | state_show(struct md_rdev *rdev, char *page) |
86e6ffdd | 2673 | { |
35b785f7 | 2674 | char *sep = ","; |
20a49ff6 | 2675 | size_t len = 0; |
758bfc8a | 2676 | unsigned long flags = ACCESS_ONCE(rdev->flags); |
86e6ffdd | 2677 | |
758bfc8a | 2678 | if (test_bit(Faulty, &flags) || |
dcbcb486 TM |
2679 | (!test_bit(ExternalBbl, &flags) && |
2680 | rdev->badblocks.unacked_exist)) | |
35b785f7 TM |
2681 | len += sprintf(page+len, "faulty%s", sep); |
2682 | if (test_bit(In_sync, &flags)) | |
2683 | len += sprintf(page+len, "in_sync%s", sep); | |
2684 | if (test_bit(Journal, &flags)) | |
2685 | len += sprintf(page+len, "journal%s", sep); | |
2686 | if (test_bit(WriteMostly, &flags)) | |
2687 | len += sprintf(page+len, "write_mostly%s", sep); | |
758bfc8a | 2688 | if (test_bit(Blocked, &flags) || |
52c64152 | 2689 | (rdev->badblocks.unacked_exist |
35b785f7 TM |
2690 | && !test_bit(Faulty, &flags))) |
2691 | len += sprintf(page+len, "blocked%s", sep); | |
758bfc8a | 2692 | if (!test_bit(Faulty, &flags) && |
f2076e7d | 2693 | !test_bit(Journal, &flags) && |
35b785f7 TM |
2694 | !test_bit(In_sync, &flags)) |
2695 | len += sprintf(page+len, "spare%s", sep); | |
2696 | if (test_bit(WriteErrorSeen, &flags)) | |
2697 | len += sprintf(page+len, "write_error%s", sep); | |
2698 | if (test_bit(WantReplacement, &flags)) | |
2699 | len += sprintf(page+len, "want_replacement%s", sep); | |
2700 | if (test_bit(Replacement, &flags)) | |
2701 | len += sprintf(page+len, "replacement%s", sep); | |
2702 | if (test_bit(ExternalBbl, &flags)) | |
2703 | len += sprintf(page+len, "external_bbl%s", sep); | |
688834e6 N |
2704 | if (test_bit(FailFast, &flags)) |
2705 | len += sprintf(page+len, "failfast%s", sep); | |
35b785f7 TM |
2706 | |
2707 | if (len) | |
2708 | len -= strlen(sep); | |
2d78f8c4 | 2709 | |
86e6ffdd N |
2710 | return len+sprintf(page+len, "\n"); |
2711 | } | |
2712 | ||
45dc2de1 | 2713 | static ssize_t |
3cb03002 | 2714 | state_store(struct md_rdev *rdev, const char *buf, size_t len) |
45dc2de1 N |
2715 | { |
2716 | /* can write | |
de393cde | 2717 | * faulty - simulates an error |
45dc2de1 | 2718 | * remove - disconnects the device |
f655675b N |
2719 | * writemostly - sets write_mostly |
2720 | * -writemostly - clears write_mostly | |
de393cde N |
2721 | * blocked - sets the Blocked flags |
2722 | * -blocked - clears the Blocked and possibly simulates an error | |
6d56e278 | 2723 | * insync - sets Insync providing device isn't active |
f466722c N |
2724 | * -insync - clear Insync for a device with a slot assigned, |
2725 | * so that it gets rebuilt based on bitmap | |
d7a9d443 N |
2726 | * write_error - sets WriteErrorSeen |
2727 | * -write_error - clears WriteErrorSeen | |
688834e6 | 2728 | * {,-}failfast - set/clear FailFast |
45dc2de1 N |
2729 | */ |
2730 | int err = -EINVAL; | |
2731 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2732 | md_error(rdev->mddev, rdev); | |
5ef56c8f N |
2733 | if (test_bit(Faulty, &rdev->flags)) |
2734 | err = 0; | |
2735 | else | |
2736 | err = -EBUSY; | |
45dc2de1 | 2737 | } else if (cmd_match(buf, "remove")) { |
5d881783 SL |
2738 | if (rdev->mddev->pers) { |
2739 | clear_bit(Blocked, &rdev->flags); | |
2740 | remove_and_add_spares(rdev->mddev, rdev); | |
2741 | } | |
45dc2de1 N |
2742 | if (rdev->raid_disk >= 0) |
2743 | err = -EBUSY; | |
2744 | else { | |
fd01b88c | 2745 | struct mddev *mddev = rdev->mddev; |
45dc2de1 | 2746 | err = 0; |
a9720903 GJ |
2747 | if (mddev_is_clustered(mddev)) |
2748 | err = md_cluster_ops->remove_disk(mddev, rdev); | |
2749 | ||
2750 | if (err == 0) { | |
2751 | md_kick_rdev_from_array(rdev); | |
060b0689 | 2752 | if (mddev->pers) { |
2953079c | 2753 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
060b0689 N |
2754 | md_wakeup_thread(mddev->thread); |
2755 | } | |
a9720903 GJ |
2756 | md_new_event(mddev); |
2757 | } | |
45dc2de1 | 2758 | } |
f655675b N |
2759 | } else if (cmd_match(buf, "writemostly")) { |
2760 | set_bit(WriteMostly, &rdev->flags); | |
2761 | err = 0; | |
2762 | } else if (cmd_match(buf, "-writemostly")) { | |
2763 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2764 | err = 0; |
2765 | } else if (cmd_match(buf, "blocked")) { | |
2766 | set_bit(Blocked, &rdev->flags); | |
2767 | err = 0; | |
2768 | } else if (cmd_match(buf, "-blocked")) { | |
de393cde | 2769 | if (!test_bit(Faulty, &rdev->flags) && |
dcbcb486 | 2770 | !test_bit(ExternalBbl, &rdev->flags) && |
7da64a0a | 2771 | rdev->badblocks.unacked_exist) { |
de393cde N |
2772 | /* metadata handler doesn't understand badblocks, |
2773 | * so we need to fail the device | |
2774 | */ | |
2775 | md_error(rdev->mddev, rdev); | |
2776 | } | |
6bfe0b49 | 2777 | clear_bit(Blocked, &rdev->flags); |
de393cde | 2778 | clear_bit(BlockedBadBlocks, &rdev->flags); |
6bfe0b49 DW |
2779 | wake_up(&rdev->blocked_wait); |
2780 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2781 | md_wakeup_thread(rdev->mddev->thread); | |
2782 | ||
6d56e278 N |
2783 | err = 0; |
2784 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2785 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2786 | err = 0; |
688834e6 N |
2787 | } else if (cmd_match(buf, "failfast")) { |
2788 | set_bit(FailFast, &rdev->flags); | |
2789 | err = 0; | |
2790 | } else if (cmd_match(buf, "-failfast")) { | |
2791 | clear_bit(FailFast, &rdev->flags); | |
2792 | err = 0; | |
f2076e7d SL |
2793 | } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 && |
2794 | !test_bit(Journal, &rdev->flags)) { | |
e1960f8c N |
2795 | if (rdev->mddev->pers == NULL) { |
2796 | clear_bit(In_sync, &rdev->flags); | |
2797 | rdev->saved_raid_disk = rdev->raid_disk; | |
2798 | rdev->raid_disk = -1; | |
2799 | err = 0; | |
2800 | } | |
d7a9d443 N |
2801 | } else if (cmd_match(buf, "write_error")) { |
2802 | set_bit(WriteErrorSeen, &rdev->flags); | |
2803 | err = 0; | |
2804 | } else if (cmd_match(buf, "-write_error")) { | |
2805 | clear_bit(WriteErrorSeen, &rdev->flags); | |
2806 | err = 0; | |
2d78f8c4 N |
2807 | } else if (cmd_match(buf, "want_replacement")) { |
2808 | /* Any non-spare device that is not a replacement can | |
2809 | * become want_replacement at any time, but we then need to | |
2810 | * check if recovery is needed. | |
2811 | */ | |
2812 | if (rdev->raid_disk >= 0 && | |
f2076e7d | 2813 | !test_bit(Journal, &rdev->flags) && |
2d78f8c4 N |
2814 | !test_bit(Replacement, &rdev->flags)) |
2815 | set_bit(WantReplacement, &rdev->flags); | |
2816 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2817 | md_wakeup_thread(rdev->mddev->thread); | |
2818 | err = 0; | |
2819 | } else if (cmd_match(buf, "-want_replacement")) { | |
2820 | /* Clearing 'want_replacement' is always allowed. | |
2821 | * Once replacements starts it is too late though. | |
2822 | */ | |
2823 | err = 0; | |
2824 | clear_bit(WantReplacement, &rdev->flags); | |
2825 | } else if (cmd_match(buf, "replacement")) { | |
2826 | /* Can only set a device as a replacement when array has not | |
2827 | * yet been started. Once running, replacement is automatic | |
2828 | * from spares, or by assigning 'slot'. | |
2829 | */ | |
2830 | if (rdev->mddev->pers) | |
2831 | err = -EBUSY; | |
2832 | else { | |
2833 | set_bit(Replacement, &rdev->flags); | |
2834 | err = 0; | |
2835 | } | |
2836 | } else if (cmd_match(buf, "-replacement")) { | |
2837 | /* Similarly, can only clear Replacement before start */ | |
2838 | if (rdev->mddev->pers) | |
2839 | err = -EBUSY; | |
2840 | else { | |
2841 | clear_bit(Replacement, &rdev->flags); | |
2842 | err = 0; | |
2843 | } | |
a6da4ef8 GR |
2844 | } else if (cmd_match(buf, "re-add")) { |
2845 | if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1)) { | |
97f6cd39 GR |
2846 | /* clear_bit is performed _after_ all the devices |
2847 | * have their local Faulty bit cleared. If any writes | |
2848 | * happen in the meantime in the local node, they | |
2849 | * will land in the local bitmap, which will be synced | |
2850 | * by this node eventually | |
2851 | */ | |
2852 | if (!mddev_is_clustered(rdev->mddev) || | |
2853 | (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) { | |
2854 | clear_bit(Faulty, &rdev->flags); | |
2855 | err = add_bound_rdev(rdev); | |
2856 | } | |
a6da4ef8 GR |
2857 | } else |
2858 | err = -EBUSY; | |
35b785f7 TM |
2859 | } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) { |
2860 | set_bit(ExternalBbl, &rdev->flags); | |
2861 | rdev->badblocks.shift = 0; | |
2862 | err = 0; | |
2863 | } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) { | |
2864 | clear_bit(ExternalBbl, &rdev->flags); | |
2865 | err = 0; | |
45dc2de1 | 2866 | } |
00bcb4ac N |
2867 | if (!err) |
2868 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2869 | return err ? err : len; |
2870 | } | |
80ca3a44 | 2871 | static struct rdev_sysfs_entry rdev_state = |
750f199e | 2872 | __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store); |
86e6ffdd | 2873 | |
4dbcdc75 | 2874 | static ssize_t |
3cb03002 | 2875 | errors_show(struct md_rdev *rdev, char *page) |
4dbcdc75 N |
2876 | { |
2877 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2878 | } | |
2879 | ||
2880 | static ssize_t | |
3cb03002 | 2881 | errors_store(struct md_rdev *rdev, const char *buf, size_t len) |
4dbcdc75 | 2882 | { |
4c9309c0 AD |
2883 | unsigned int n; |
2884 | int rv; | |
2885 | ||
2886 | rv = kstrtouint(buf, 10, &n); | |
2887 | if (rv < 0) | |
2888 | return rv; | |
2889 | atomic_set(&rdev->corrected_errors, n); | |
2890 | return len; | |
4dbcdc75 N |
2891 | } |
2892 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2893 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2894 | |
014236d2 | 2895 | static ssize_t |
3cb03002 | 2896 | slot_show(struct md_rdev *rdev, char *page) |
014236d2 | 2897 | { |
f2076e7d SL |
2898 | if (test_bit(Journal, &rdev->flags)) |
2899 | return sprintf(page, "journal\n"); | |
2900 | else if (rdev->raid_disk < 0) | |
014236d2 N |
2901 | return sprintf(page, "none\n"); |
2902 | else | |
2903 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2904 | } | |
2905 | ||
2906 | static ssize_t | |
3cb03002 | 2907 | slot_store(struct md_rdev *rdev, const char *buf, size_t len) |
014236d2 | 2908 | { |
4c9309c0 | 2909 | int slot; |
c303da6d | 2910 | int err; |
4c9309c0 | 2911 | |
f2076e7d SL |
2912 | if (test_bit(Journal, &rdev->flags)) |
2913 | return -EBUSY; | |
014236d2 N |
2914 | if (strncmp(buf, "none", 4)==0) |
2915 | slot = -1; | |
4c9309c0 AD |
2916 | else { |
2917 | err = kstrtouint(buf, 10, (unsigned int *)&slot); | |
2918 | if (err < 0) | |
2919 | return err; | |
2920 | } | |
6c2fce2e | 2921 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2922 | /* Setting 'slot' on an active array requires also |
2923 | * updating the 'rd%d' link, and communicating | |
2924 | * with the personality with ->hot_*_disk. | |
2925 | * For now we only support removing | |
2926 | * failed/spare devices. This normally happens automatically, | |
2927 | * but not when the metadata is externally managed. | |
2928 | */ | |
c303da6d N |
2929 | if (rdev->raid_disk == -1) |
2930 | return -EEXIST; | |
2931 | /* personality does all needed checks */ | |
01393f3d | 2932 | if (rdev->mddev->pers->hot_remove_disk == NULL) |
c303da6d | 2933 | return -EINVAL; |
746d3207 N |
2934 | clear_bit(Blocked, &rdev->flags); |
2935 | remove_and_add_spares(rdev->mddev, rdev); | |
2936 | if (rdev->raid_disk >= 0) | |
2937 | return -EBUSY; | |
c303da6d N |
2938 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2939 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e | 2940 | } else if (rdev->mddev->pers) { |
6c2fce2e | 2941 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2942 | * if we ever get bitmaps working here. |
6c2fce2e | 2943 | */ |
cb01c549 | 2944 | int err; |
6c2fce2e NB |
2945 | |
2946 | if (rdev->raid_disk != -1) | |
2947 | return -EBUSY; | |
2948 | ||
c6751b2b N |
2949 | if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
2950 | return -EBUSY; | |
2951 | ||
6c2fce2e NB |
2952 | if (rdev->mddev->pers->hot_add_disk == NULL) |
2953 | return -EINVAL; | |
2954 | ||
ba1b41b6 N |
2955 | if (slot >= rdev->mddev->raid_disks && |
2956 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
2957 | return -ENOSPC; | |
2958 | ||
6c2fce2e NB |
2959 | rdev->raid_disk = slot; |
2960 | if (test_bit(In_sync, &rdev->flags)) | |
2961 | rdev->saved_raid_disk = slot; | |
2962 | else | |
2963 | rdev->saved_raid_disk = -1; | |
d30519fc | 2964 | clear_bit(In_sync, &rdev->flags); |
8313b8e5 | 2965 | clear_bit(Bitmap_sync, &rdev->flags); |
cb01c549 GR |
2966 | err = rdev->mddev->pers-> |
2967 | hot_add_disk(rdev->mddev, rdev); | |
2968 | if (err) { | |
2969 | rdev->raid_disk = -1; | |
2970 | return err; | |
2971 | } else | |
2972 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
2973 | if (sysfs_link_rdev(rdev->mddev, rdev)) | |
2974 | /* failure here is OK */; | |
6c2fce2e | 2975 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d | 2976 | } else { |
ba1b41b6 N |
2977 | if (slot >= rdev->mddev->raid_disks && |
2978 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
c303da6d N |
2979 | return -ENOSPC; |
2980 | rdev->raid_disk = slot; | |
2981 | /* assume it is working */ | |
c5d79adb N |
2982 | clear_bit(Faulty, &rdev->flags); |
2983 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2984 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2985 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2986 | } |
014236d2 N |
2987 | return len; |
2988 | } | |
2989 | ||
014236d2 | 2990 | static struct rdev_sysfs_entry rdev_slot = |
80ca3a44 | 2991 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2992 | |
93c8cad0 | 2993 | static ssize_t |
3cb03002 | 2994 | offset_show(struct md_rdev *rdev, char *page) |
93c8cad0 | 2995 | { |
6961ece4 | 2996 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2997 | } |
2998 | ||
2999 | static ssize_t | |
3cb03002 | 3000 | offset_store(struct md_rdev *rdev, const char *buf, size_t len) |
93c8cad0 | 3001 | { |
c6563a8c | 3002 | unsigned long long offset; |
b29bebd6 | 3003 | if (kstrtoull(buf, 10, &offset) < 0) |
93c8cad0 | 3004 | return -EINVAL; |
8ed0a521 | 3005 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 3006 | return -EBUSY; |
dd8ac336 | 3007 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
3008 | /* Must set offset before size, so overlap checks |
3009 | * can be sane */ | |
3010 | return -EBUSY; | |
93c8cad0 | 3011 | rdev->data_offset = offset; |
25f7fd47 | 3012 | rdev->new_data_offset = offset; |
93c8cad0 N |
3013 | return len; |
3014 | } | |
3015 | ||
3016 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 3017 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 3018 | |
c6563a8c N |
3019 | static ssize_t new_offset_show(struct md_rdev *rdev, char *page) |
3020 | { | |
3021 | return sprintf(page, "%llu\n", | |
3022 | (unsigned long long)rdev->new_data_offset); | |
3023 | } | |
3024 | ||
3025 | static ssize_t new_offset_store(struct md_rdev *rdev, | |
3026 | const char *buf, size_t len) | |
3027 | { | |
3028 | unsigned long long new_offset; | |
3029 | struct mddev *mddev = rdev->mddev; | |
3030 | ||
b29bebd6 | 3031 | if (kstrtoull(buf, 10, &new_offset) < 0) |
c6563a8c N |
3032 | return -EINVAL; |
3033 | ||
f851b60d N |
3034 | if (mddev->sync_thread || |
3035 | test_bit(MD_RECOVERY_RUNNING,&mddev->recovery)) | |
c6563a8c N |
3036 | return -EBUSY; |
3037 | if (new_offset == rdev->data_offset) | |
3038 | /* reset is always permitted */ | |
3039 | ; | |
3040 | else if (new_offset > rdev->data_offset) { | |
3041 | /* must not push array size beyond rdev_sectors */ | |
3042 | if (new_offset - rdev->data_offset | |
3043 | + mddev->dev_sectors > rdev->sectors) | |
3044 | return -E2BIG; | |
3045 | } | |
3046 | /* Metadata worries about other space details. */ | |
3047 | ||
3048 | /* decreasing the offset is inconsistent with a backwards | |
3049 | * reshape. | |
3050 | */ | |
3051 | if (new_offset < rdev->data_offset && | |
3052 | mddev->reshape_backwards) | |
3053 | return -EINVAL; | |
3054 | /* Increasing offset is inconsistent with forwards | |
3055 | * reshape. reshape_direction should be set to | |
3056 | * 'backwards' first. | |
3057 | */ | |
3058 | if (new_offset > rdev->data_offset && | |
3059 | !mddev->reshape_backwards) | |
3060 | return -EINVAL; | |
3061 | ||
3062 | if (mddev->pers && mddev->persistent && | |
3063 | !super_types[mddev->major_version] | |
3064 | .allow_new_offset(rdev, new_offset)) | |
3065 | return -E2BIG; | |
3066 | rdev->new_data_offset = new_offset; | |
3067 | if (new_offset > rdev->data_offset) | |
3068 | mddev->reshape_backwards = 1; | |
3069 | else if (new_offset < rdev->data_offset) | |
3070 | mddev->reshape_backwards = 0; | |
3071 | ||
3072 | return len; | |
3073 | } | |
3074 | static struct rdev_sysfs_entry rdev_new_offset = | |
3075 | __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store); | |
3076 | ||
83303b61 | 3077 | static ssize_t |
3cb03002 | 3078 | rdev_size_show(struct md_rdev *rdev, char *page) |
83303b61 | 3079 | { |
dd8ac336 | 3080 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
3081 | } |
3082 | ||
c5d79adb N |
3083 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
3084 | { | |
3085 | /* check if two start/length pairs overlap */ | |
3086 | if (s1+l1 <= s2) | |
3087 | return 0; | |
3088 | if (s2+l2 <= s1) | |
3089 | return 0; | |
3090 | return 1; | |
3091 | } | |
3092 | ||
b522adcd DW |
3093 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
3094 | { | |
3095 | unsigned long long blocks; | |
3096 | sector_t new; | |
3097 | ||
b29bebd6 | 3098 | if (kstrtoull(buf, 10, &blocks) < 0) |
b522adcd DW |
3099 | return -EINVAL; |
3100 | ||
3101 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
3102 | return -EINVAL; /* sector conversion overflow */ | |
3103 | ||
3104 | new = blocks * 2; | |
3105 | if (new != blocks * 2) | |
3106 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
3107 | ||
3108 | *sectors = new; | |
3109 | return 0; | |
3110 | } | |
3111 | ||
83303b61 | 3112 | static ssize_t |
3cb03002 | 3113 | rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) |
83303b61 | 3114 | { |
fd01b88c | 3115 | struct mddev *my_mddev = rdev->mddev; |
dd8ac336 | 3116 | sector_t oldsectors = rdev->sectors; |
b522adcd | 3117 | sector_t sectors; |
27c529bb | 3118 | |
f2076e7d SL |
3119 | if (test_bit(Journal, &rdev->flags)) |
3120 | return -EBUSY; | |
b522adcd | 3121 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 3122 | return -EINVAL; |
c6563a8c N |
3123 | if (rdev->data_offset != rdev->new_data_offset) |
3124 | return -EINVAL; /* too confusing */ | |
0cd17fec | 3125 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 3126 | if (my_mddev->persistent) { |
dd8ac336 AN |
3127 | sectors = super_types[my_mddev->major_version]. |
3128 | rdev_size_change(rdev, sectors); | |
3129 | if (!sectors) | |
0cd17fec | 3130 | return -EBUSY; |
dd8ac336 | 3131 | } else if (!sectors) |
77304d2a | 3132 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 3133 | rdev->data_offset; |
a6468539 N |
3134 | if (!my_mddev->pers->resize) |
3135 | /* Cannot change size for RAID0 or Linear etc */ | |
3136 | return -EINVAL; | |
0cd17fec | 3137 | } |
dd8ac336 | 3138 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 3139 | return -EINVAL; /* component must fit device */ |
0cd17fec | 3140 | |
dd8ac336 AN |
3141 | rdev->sectors = sectors; |
3142 | if (sectors > oldsectors && my_mddev->external) { | |
8b1afc3d N |
3143 | /* Need to check that all other rdevs with the same |
3144 | * ->bdev do not overlap. 'rcu' is sufficient to walk | |
3145 | * the rdev lists safely. | |
3146 | * This check does not provide a hard guarantee, it | |
3147 | * just helps avoid dangerous mistakes. | |
c5d79adb | 3148 | */ |
fd01b88c | 3149 | struct mddev *mddev; |
c5d79adb | 3150 | int overlap = 0; |
159ec1fc | 3151 | struct list_head *tmp; |
c5d79adb | 3152 | |
8b1afc3d | 3153 | rcu_read_lock(); |
29ac4aa3 | 3154 | for_each_mddev(mddev, tmp) { |
3cb03002 | 3155 | struct md_rdev *rdev2; |
c5d79adb | 3156 | |
dafb20fa | 3157 | rdev_for_each(rdev2, mddev) |
f21e9ff7 N |
3158 | if (rdev->bdev == rdev2->bdev && |
3159 | rdev != rdev2 && | |
3160 | overlaps(rdev->data_offset, rdev->sectors, | |
3161 | rdev2->data_offset, | |
3162 | rdev2->sectors)) { | |
c5d79adb N |
3163 | overlap = 1; |
3164 | break; | |
3165 | } | |
c5d79adb N |
3166 | if (overlap) { |
3167 | mddev_put(mddev); | |
3168 | break; | |
3169 | } | |
3170 | } | |
8b1afc3d | 3171 | rcu_read_unlock(); |
c5d79adb N |
3172 | if (overlap) { |
3173 | /* Someone else could have slipped in a size | |
3174 | * change here, but doing so is just silly. | |
dd8ac336 | 3175 | * We put oldsectors back because we *know* it is |
c5d79adb N |
3176 | * safe, and trust userspace not to race with |
3177 | * itself | |
3178 | */ | |
dd8ac336 | 3179 | rdev->sectors = oldsectors; |
c5d79adb N |
3180 | return -EBUSY; |
3181 | } | |
3182 | } | |
83303b61 N |
3183 | return len; |
3184 | } | |
3185 | ||
3186 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 3187 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 3188 | |
3cb03002 | 3189 | static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) |
06e3c817 DW |
3190 | { |
3191 | unsigned long long recovery_start = rdev->recovery_offset; | |
3192 | ||
3193 | if (test_bit(In_sync, &rdev->flags) || | |
3194 | recovery_start == MaxSector) | |
3195 | return sprintf(page, "none\n"); | |
3196 | ||
3197 | return sprintf(page, "%llu\n", recovery_start); | |
3198 | } | |
3199 | ||
3cb03002 | 3200 | static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) |
06e3c817 DW |
3201 | { |
3202 | unsigned long long recovery_start; | |
3203 | ||
3204 | if (cmd_match(buf, "none")) | |
3205 | recovery_start = MaxSector; | |
b29bebd6 | 3206 | else if (kstrtoull(buf, 10, &recovery_start)) |
06e3c817 DW |
3207 | return -EINVAL; |
3208 | ||
3209 | if (rdev->mddev->pers && | |
3210 | rdev->raid_disk >= 0) | |
3211 | return -EBUSY; | |
3212 | ||
3213 | rdev->recovery_offset = recovery_start; | |
3214 | if (recovery_start == MaxSector) | |
3215 | set_bit(In_sync, &rdev->flags); | |
3216 | else | |
3217 | clear_bit(In_sync, &rdev->flags); | |
3218 | return len; | |
3219 | } | |
3220 | ||
3221 | static struct rdev_sysfs_entry rdev_recovery_start = | |
3222 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
3223 | ||
fc974ee2 VV |
3224 | /* sysfs access to bad-blocks list. |
3225 | * We present two files. | |
3226 | * 'bad-blocks' lists sector numbers and lengths of ranges that | |
3227 | * are recorded as bad. The list is truncated to fit within | |
3228 | * the one-page limit of sysfs. | |
3229 | * Writing "sector length" to this file adds an acknowledged | |
3230 | * bad block list. | |
3231 | * 'unacknowledged-bad-blocks' lists bad blocks that have not yet | |
3232 | * been acknowledged. Writing to this file adds bad blocks | |
3233 | * without acknowledging them. This is largely for testing. | |
3234 | */ | |
3cb03002 | 3235 | static ssize_t bb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
3236 | { |
3237 | return badblocks_show(&rdev->badblocks, page, 0); | |
3238 | } | |
3cb03002 | 3239 | static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 | 3240 | { |
de393cde N |
3241 | int rv = badblocks_store(&rdev->badblocks, page, len, 0); |
3242 | /* Maybe that ack was all we needed */ | |
3243 | if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) | |
3244 | wake_up(&rdev->blocked_wait); | |
3245 | return rv; | |
16c791a5 N |
3246 | } |
3247 | static struct rdev_sysfs_entry rdev_bad_blocks = | |
3248 | __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); | |
3249 | ||
3cb03002 | 3250 | static ssize_t ubb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
3251 | { |
3252 | return badblocks_show(&rdev->badblocks, page, 1); | |
3253 | } | |
3cb03002 | 3254 | static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 N |
3255 | { |
3256 | return badblocks_store(&rdev->badblocks, page, len, 1); | |
3257 | } | |
3258 | static struct rdev_sysfs_entry rdev_unack_bad_blocks = | |
3259 | __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); | |
3260 | ||
664aed04 AP |
3261 | static ssize_t |
3262 | ppl_sector_show(struct md_rdev *rdev, char *page) | |
3263 | { | |
3264 | return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector); | |
3265 | } | |
3266 | ||
3267 | static ssize_t | |
3268 | ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len) | |
3269 | { | |
3270 | unsigned long long sector; | |
3271 | ||
3272 | if (kstrtoull(buf, 10, §or) < 0) | |
3273 | return -EINVAL; | |
3274 | if (sector != (sector_t)sector) | |
3275 | return -EINVAL; | |
3276 | ||
3277 | if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) && | |
3278 | rdev->raid_disk >= 0) | |
3279 | return -EBUSY; | |
3280 | ||
3281 | if (rdev->mddev->persistent) { | |
3282 | if (rdev->mddev->major_version == 0) | |
3283 | return -EINVAL; | |
3284 | if ((sector > rdev->sb_start && | |
3285 | sector - rdev->sb_start > S16_MAX) || | |
3286 | (sector < rdev->sb_start && | |
3287 | rdev->sb_start - sector > -S16_MIN)) | |
3288 | return -EINVAL; | |
3289 | rdev->ppl.offset = sector - rdev->sb_start; | |
3290 | } else if (!rdev->mddev->external) { | |
3291 | return -EBUSY; | |
3292 | } | |
3293 | rdev->ppl.sector = sector; | |
3294 | return len; | |
3295 | } | |
3296 | ||
3297 | static struct rdev_sysfs_entry rdev_ppl_sector = | |
3298 | __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store); | |
3299 | ||
3300 | static ssize_t | |
3301 | ppl_size_show(struct md_rdev *rdev, char *page) | |
3302 | { | |
3303 | return sprintf(page, "%u\n", rdev->ppl.size); | |
3304 | } | |
3305 | ||
3306 | static ssize_t | |
3307 | ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len) | |
3308 | { | |
3309 | unsigned int size; | |
3310 | ||
3311 | if (kstrtouint(buf, 10, &size) < 0) | |
3312 | return -EINVAL; | |
3313 | ||
3314 | if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) && | |
3315 | rdev->raid_disk >= 0) | |
3316 | return -EBUSY; | |
3317 | ||
3318 | if (rdev->mddev->persistent) { | |
3319 | if (rdev->mddev->major_version == 0) | |
3320 | return -EINVAL; | |
3321 | if (size > U16_MAX) | |
3322 | return -EINVAL; | |
3323 | } else if (!rdev->mddev->external) { | |
3324 | return -EBUSY; | |
3325 | } | |
3326 | rdev->ppl.size = size; | |
3327 | return len; | |
3328 | } | |
3329 | ||
3330 | static struct rdev_sysfs_entry rdev_ppl_size = | |
3331 | __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store); | |
3332 | ||
86e6ffdd N |
3333 | static struct attribute *rdev_default_attrs[] = { |
3334 | &rdev_state.attr, | |
4dbcdc75 | 3335 | &rdev_errors.attr, |
014236d2 | 3336 | &rdev_slot.attr, |
93c8cad0 | 3337 | &rdev_offset.attr, |
c6563a8c | 3338 | &rdev_new_offset.attr, |
83303b61 | 3339 | &rdev_size.attr, |
06e3c817 | 3340 | &rdev_recovery_start.attr, |
16c791a5 N |
3341 | &rdev_bad_blocks.attr, |
3342 | &rdev_unack_bad_blocks.attr, | |
664aed04 AP |
3343 | &rdev_ppl_sector.attr, |
3344 | &rdev_ppl_size.attr, | |
86e6ffdd N |
3345 | NULL, |
3346 | }; | |
3347 | static ssize_t | |
3348 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3349 | { | |
3350 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 3351 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
86e6ffdd N |
3352 | |
3353 | if (!entry->show) | |
3354 | return -EIO; | |
758bfc8a N |
3355 | if (!rdev->mddev) |
3356 | return -EBUSY; | |
3357 | return entry->show(rdev, page); | |
86e6ffdd N |
3358 | } |
3359 | ||
3360 | static ssize_t | |
3361 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
3362 | const char *page, size_t length) | |
3363 | { | |
3364 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 3365 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
27c529bb | 3366 | ssize_t rv; |
fd01b88c | 3367 | struct mddev *mddev = rdev->mddev; |
86e6ffdd N |
3368 | |
3369 | if (!entry->store) | |
3370 | return -EIO; | |
67463acb N |
3371 | if (!capable(CAP_SYS_ADMIN)) |
3372 | return -EACCES; | |
27c529bb | 3373 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 3374 | if (!rv) { |
27c529bb N |
3375 | if (rdev->mddev == NULL) |
3376 | rv = -EBUSY; | |
3377 | else | |
3378 | rv = entry->store(rdev, page, length); | |
6a51830e | 3379 | mddev_unlock(mddev); |
ca388059 N |
3380 | } |
3381 | return rv; | |
86e6ffdd N |
3382 | } |
3383 | ||
3384 | static void rdev_free(struct kobject *ko) | |
3385 | { | |
3cb03002 | 3386 | struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); |
86e6ffdd N |
3387 | kfree(rdev); |
3388 | } | |
52cf25d0 | 3389 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
3390 | .show = rdev_attr_show, |
3391 | .store = rdev_attr_store, | |
3392 | }; | |
3393 | static struct kobj_type rdev_ktype = { | |
3394 | .release = rdev_free, | |
3395 | .sysfs_ops = &rdev_sysfs_ops, | |
3396 | .default_attrs = rdev_default_attrs, | |
3397 | }; | |
3398 | ||
3cb03002 | 3399 | int md_rdev_init(struct md_rdev *rdev) |
e8bb9a83 N |
3400 | { |
3401 | rdev->desc_nr = -1; | |
3402 | rdev->saved_raid_disk = -1; | |
3403 | rdev->raid_disk = -1; | |
3404 | rdev->flags = 0; | |
3405 | rdev->data_offset = 0; | |
c6563a8c | 3406 | rdev->new_data_offset = 0; |
e8bb9a83 | 3407 | rdev->sb_events = 0; |
0e3ef49e | 3408 | rdev->last_read_error = 0; |
2699b672 N |
3409 | rdev->sb_loaded = 0; |
3410 | rdev->bb_page = NULL; | |
e8bb9a83 N |
3411 | atomic_set(&rdev->nr_pending, 0); |
3412 | atomic_set(&rdev->read_errors, 0); | |
3413 | atomic_set(&rdev->corrected_errors, 0); | |
3414 | ||
3415 | INIT_LIST_HEAD(&rdev->same_set); | |
3416 | init_waitqueue_head(&rdev->blocked_wait); | |
2230dfe4 N |
3417 | |
3418 | /* Add space to store bad block list. | |
3419 | * This reserves the space even on arrays where it cannot | |
3420 | * be used - I wonder if that matters | |
3421 | */ | |
fc974ee2 | 3422 | return badblocks_init(&rdev->badblocks, 0); |
e8bb9a83 N |
3423 | } |
3424 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
3425 | /* |
3426 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
3427 | * | |
3428 | * mark the device faulty if: | |
3429 | * | |
3430 | * - the device is nonexistent (zero size) | |
3431 | * - the device has no valid superblock | |
3432 | * | |
3433 | * a faulty rdev _never_ has rdev->sb set. | |
3434 | */ | |
3cb03002 | 3435 | static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) |
1da177e4 LT |
3436 | { |
3437 | char b[BDEVNAME_SIZE]; | |
3438 | int err; | |
3cb03002 | 3439 | struct md_rdev *rdev; |
1da177e4 LT |
3440 | sector_t size; |
3441 | ||
9ffae0cf | 3442 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
9d48739e | 3443 | if (!rdev) |
1da177e4 | 3444 | return ERR_PTR(-ENOMEM); |
1da177e4 | 3445 | |
2230dfe4 N |
3446 | err = md_rdev_init(rdev); |
3447 | if (err) | |
3448 | goto abort_free; | |
3449 | err = alloc_disk_sb(rdev); | |
3450 | if (err) | |
1da177e4 LT |
3451 | goto abort_free; |
3452 | ||
c5d79adb | 3453 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
3454 | if (err) |
3455 | goto abort_free; | |
3456 | ||
f9cb074b | 3457 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 3458 | |
77304d2a | 3459 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 | 3460 | if (!size) { |
9d48739e | 3461 | pr_warn("md: %s has zero or unknown size, marking faulty!\n", |
1da177e4 LT |
3462 | bdevname(rdev->bdev,b)); |
3463 | err = -EINVAL; | |
3464 | goto abort_free; | |
3465 | } | |
3466 | ||
3467 | if (super_format >= 0) { | |
3468 | err = super_types[super_format]. | |
3469 | load_super(rdev, NULL, super_minor); | |
3470 | if (err == -EINVAL) { | |
9d48739e | 3471 | pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n", |
df968c4e | 3472 | bdevname(rdev->bdev,b), |
9d48739e | 3473 | super_format, super_minor); |
1da177e4 LT |
3474 | goto abort_free; |
3475 | } | |
3476 | if (err < 0) { | |
9d48739e | 3477 | pr_warn("md: could not read %s's sb, not importing!\n", |
1da177e4 LT |
3478 | bdevname(rdev->bdev,b)); |
3479 | goto abort_free; | |
3480 | } | |
3481 | } | |
6bfe0b49 | 3482 | |
1da177e4 LT |
3483 | return rdev; |
3484 | ||
3485 | abort_free: | |
2699b672 N |
3486 | if (rdev->bdev) |
3487 | unlock_rdev(rdev); | |
545c8795 | 3488 | md_rdev_clear(rdev); |
1da177e4 LT |
3489 | kfree(rdev); |
3490 | return ERR_PTR(err); | |
3491 | } | |
3492 | ||
3493 | /* | |
3494 | * Check a full RAID array for plausibility | |
3495 | */ | |
3496 | ||
f72ffdd6 | 3497 | static void analyze_sbs(struct mddev *mddev) |
1da177e4 LT |
3498 | { |
3499 | int i; | |
3cb03002 | 3500 | struct md_rdev *rdev, *freshest, *tmp; |
1da177e4 LT |
3501 | char b[BDEVNAME_SIZE]; |
3502 | ||
3503 | freshest = NULL; | |
dafb20fa | 3504 | rdev_for_each_safe(rdev, tmp, mddev) |
1da177e4 LT |
3505 | switch (super_types[mddev->major_version]. |
3506 | load_super(rdev, freshest, mddev->minor_version)) { | |
3507 | case 1: | |
3508 | freshest = rdev; | |
3509 | break; | |
3510 | case 0: | |
3511 | break; | |
3512 | default: | |
9d48739e | 3513 | pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n", |
1da177e4 | 3514 | bdevname(rdev->bdev,b)); |
fb56dfef | 3515 | md_kick_rdev_from_array(rdev); |
1da177e4 LT |
3516 | } |
3517 | ||
1da177e4 LT |
3518 | super_types[mddev->major_version]. |
3519 | validate_super(mddev, freshest); | |
3520 | ||
3521 | i = 0; | |
dafb20fa | 3522 | rdev_for_each_safe(rdev, tmp, mddev) { |
233fca36 N |
3523 | if (mddev->max_disks && |
3524 | (rdev->desc_nr >= mddev->max_disks || | |
3525 | i > mddev->max_disks)) { | |
9d48739e N |
3526 | pr_warn("md: %s: %s: only %d devices permitted\n", |
3527 | mdname(mddev), bdevname(rdev->bdev, b), | |
3528 | mddev->max_disks); | |
fb56dfef | 3529 | md_kick_rdev_from_array(rdev); |
de01dfad N |
3530 | continue; |
3531 | } | |
1aee41f6 | 3532 | if (rdev != freshest) { |
1da177e4 LT |
3533 | if (super_types[mddev->major_version]. |
3534 | validate_super(mddev, rdev)) { | |
9d48739e | 3535 | pr_warn("md: kicking non-fresh %s from array!\n", |
1da177e4 | 3536 | bdevname(rdev->bdev,b)); |
fb56dfef | 3537 | md_kick_rdev_from_array(rdev); |
1da177e4 LT |
3538 | continue; |
3539 | } | |
1aee41f6 | 3540 | } |
1da177e4 LT |
3541 | if (mddev->level == LEVEL_MULTIPATH) { |
3542 | rdev->desc_nr = i++; | |
3543 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 3544 | set_bit(In_sync, &rdev->flags); |
f2076e7d SL |
3545 | } else if (rdev->raid_disk >= |
3546 | (mddev->raid_disks - min(0, mddev->delta_disks)) && | |
3547 | !test_bit(Journal, &rdev->flags)) { | |
a778b73f N |
3548 | rdev->raid_disk = -1; |
3549 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
3550 | } |
3551 | } | |
1da177e4 LT |
3552 | } |
3553 | ||
72e02075 N |
3554 | /* Read a fixed-point number. |
3555 | * Numbers in sysfs attributes should be in "standard" units where | |
3556 | * possible, so time should be in seconds. | |
f72ffdd6 | 3557 | * However we internally use a a much smaller unit such as |
72e02075 N |
3558 | * milliseconds or jiffies. |
3559 | * This function takes a decimal number with a possible fractional | |
3560 | * component, and produces an integer which is the result of | |
3561 | * multiplying that number by 10^'scale'. | |
3562 | * all without any floating-point arithmetic. | |
3563 | */ | |
3564 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
3565 | { | |
3566 | unsigned long result = 0; | |
3567 | long decimals = -1; | |
3568 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
3569 | if (*cp == '.') | |
3570 | decimals = 0; | |
3571 | else if (decimals < scale) { | |
3572 | unsigned int value; | |
3573 | value = *cp - '0'; | |
3574 | result = result * 10 + value; | |
3575 | if (decimals >= 0) | |
3576 | decimals++; | |
3577 | } | |
3578 | cp++; | |
3579 | } | |
3580 | if (*cp == '\n') | |
3581 | cp++; | |
3582 | if (*cp) | |
3583 | return -EINVAL; | |
3584 | if (decimals < 0) | |
3585 | decimals = 0; | |
3586 | while (decimals < scale) { | |
3587 | result *= 10; | |
3588 | decimals ++; | |
3589 | } | |
3590 | *res = result; | |
3591 | return 0; | |
3592 | } | |
3593 | ||
16f17b39 | 3594 | static ssize_t |
fd01b88c | 3595 | safe_delay_show(struct mddev *mddev, char *page) |
16f17b39 N |
3596 | { |
3597 | int msec = (mddev->safemode_delay*1000)/HZ; | |
3598 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
3599 | } | |
3600 | static ssize_t | |
fd01b88c | 3601 | safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) |
16f17b39 | 3602 | { |
16f17b39 | 3603 | unsigned long msec; |
97ce0a7f | 3604 | |
28c1b9fd | 3605 | if (mddev_is_clustered(mddev)) { |
9d48739e | 3606 | pr_warn("md: Safemode is disabled for clustered mode\n"); |
28c1b9fd GR |
3607 | return -EINVAL; |
3608 | } | |
3609 | ||
72e02075 | 3610 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 3611 | return -EINVAL; |
16f17b39 N |
3612 | if (msec == 0) |
3613 | mddev->safemode_delay = 0; | |
3614 | else { | |
19052c0e | 3615 | unsigned long old_delay = mddev->safemode_delay; |
1b30e66f N |
3616 | unsigned long new_delay = (msec*HZ)/1000; |
3617 | ||
3618 | if (new_delay == 0) | |
3619 | new_delay = 1; | |
3620 | mddev->safemode_delay = new_delay; | |
3621 | if (new_delay < old_delay || old_delay == 0) | |
3622 | mod_timer(&mddev->safemode_timer, jiffies+1); | |
16f17b39 N |
3623 | } |
3624 | return len; | |
3625 | } | |
3626 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 3627 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 3628 | |
eae1701f | 3629 | static ssize_t |
fd01b88c | 3630 | level_show(struct mddev *mddev, char *page) |
eae1701f | 3631 | { |
36d091f4 N |
3632 | struct md_personality *p; |
3633 | int ret; | |
3634 | spin_lock(&mddev->lock); | |
3635 | p = mddev->pers; | |
d9d166c2 | 3636 | if (p) |
36d091f4 | 3637 | ret = sprintf(page, "%s\n", p->name); |
d9d166c2 | 3638 | else if (mddev->clevel[0]) |
36d091f4 | 3639 | ret = sprintf(page, "%s\n", mddev->clevel); |
d9d166c2 | 3640 | else if (mddev->level != LEVEL_NONE) |
36d091f4 | 3641 | ret = sprintf(page, "%d\n", mddev->level); |
d9d166c2 | 3642 | else |
36d091f4 N |
3643 | ret = 0; |
3644 | spin_unlock(&mddev->lock); | |
3645 | return ret; | |
eae1701f N |
3646 | } |
3647 | ||
d9d166c2 | 3648 | static ssize_t |
fd01b88c | 3649 | level_store(struct mddev *mddev, const char *buf, size_t len) |
d9d166c2 | 3650 | { |
f2859af6 | 3651 | char clevel[16]; |
6791875e N |
3652 | ssize_t rv; |
3653 | size_t slen = len; | |
db721d32 | 3654 | struct md_personality *pers, *oldpers; |
f2859af6 | 3655 | long level; |
db721d32 | 3656 | void *priv, *oldpriv; |
3cb03002 | 3657 | struct md_rdev *rdev; |
245f46c2 | 3658 | |
6791875e N |
3659 | if (slen == 0 || slen >= sizeof(clevel)) |
3660 | return -EINVAL; | |
3661 | ||
3662 | rv = mddev_lock(mddev); | |
3663 | if (rv) | |
3664 | return rv; | |
3665 | ||
245f46c2 | 3666 | if (mddev->pers == NULL) { |
6791875e N |
3667 | strncpy(mddev->clevel, buf, slen); |
3668 | if (mddev->clevel[slen-1] == '\n') | |
3669 | slen--; | |
3670 | mddev->clevel[slen] = 0; | |
245f46c2 | 3671 | mddev->level = LEVEL_NONE; |
6791875e N |
3672 | rv = len; |
3673 | goto out_unlock; | |
245f46c2 | 3674 | } |
6791875e | 3675 | rv = -EROFS; |
bd8839e0 | 3676 | if (mddev->ro) |
6791875e | 3677 | goto out_unlock; |
245f46c2 N |
3678 | |
3679 | /* request to change the personality. Need to ensure: | |
3680 | * - array is not engaged in resync/recovery/reshape | |
3681 | * - old personality can be suspended | |
3682 | * - new personality will access other array. | |
3683 | */ | |
3684 | ||
6791875e | 3685 | rv = -EBUSY; |
bb4f1e9d | 3686 | if (mddev->sync_thread || |
f851b60d | 3687 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
bb4f1e9d N |
3688 | mddev->reshape_position != MaxSector || |
3689 | mddev->sysfs_active) | |
6791875e | 3690 | goto out_unlock; |
245f46c2 | 3691 | |
6791875e | 3692 | rv = -EINVAL; |
245f46c2 | 3693 | if (!mddev->pers->quiesce) { |
9d48739e N |
3694 | pr_warn("md: %s: %s does not support online personality change\n", |
3695 | mdname(mddev), mddev->pers->name); | |
6791875e | 3696 | goto out_unlock; |
245f46c2 N |
3697 | } |
3698 | ||
3699 | /* Now find the new personality */ | |
6791875e N |
3700 | strncpy(clevel, buf, slen); |
3701 | if (clevel[slen-1] == '\n') | |
3702 | slen--; | |
3703 | clevel[slen] = 0; | |
b29bebd6 | 3704 | if (kstrtol(clevel, 10, &level)) |
f2859af6 | 3705 | level = LEVEL_NONE; |
245f46c2 | 3706 | |
f2859af6 DW |
3707 | if (request_module("md-%s", clevel) != 0) |
3708 | request_module("md-level-%s", clevel); | |
245f46c2 | 3709 | spin_lock(&pers_lock); |
f2859af6 | 3710 | pers = find_pers(level, clevel); |
245f46c2 N |
3711 | if (!pers || !try_module_get(pers->owner)) { |
3712 | spin_unlock(&pers_lock); | |
9d48739e | 3713 | pr_warn("md: personality %s not loaded\n", clevel); |
6791875e N |
3714 | rv = -EINVAL; |
3715 | goto out_unlock; | |
245f46c2 N |
3716 | } |
3717 | spin_unlock(&pers_lock); | |
3718 | ||
3719 | if (pers == mddev->pers) { | |
3720 | /* Nothing to do! */ | |
3721 | module_put(pers->owner); | |
6791875e N |
3722 | rv = len; |
3723 | goto out_unlock; | |
245f46c2 N |
3724 | } |
3725 | if (!pers->takeover) { | |
3726 | module_put(pers->owner); | |
9d48739e N |
3727 | pr_warn("md: %s: %s does not support personality takeover\n", |
3728 | mdname(mddev), clevel); | |
6791875e N |
3729 | rv = -EINVAL; |
3730 | goto out_unlock; | |
245f46c2 N |
3731 | } |
3732 | ||
dafb20fa | 3733 | rdev_for_each(rdev, mddev) |
e93f68a1 N |
3734 | rdev->new_raid_disk = rdev->raid_disk; |
3735 | ||
245f46c2 N |
3736 | /* ->takeover must set new_* and/or delta_disks |
3737 | * if it succeeds, and may set them when it fails. | |
3738 | */ | |
3739 | priv = pers->takeover(mddev); | |
3740 | if (IS_ERR(priv)) { | |
3741 | mddev->new_level = mddev->level; | |
3742 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3743 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3744 | mddev->raid_disks -= mddev->delta_disks; |
3745 | mddev->delta_disks = 0; | |
2c810cdd | 3746 | mddev->reshape_backwards = 0; |
245f46c2 | 3747 | module_put(pers->owner); |
9d48739e N |
3748 | pr_warn("md: %s: %s would not accept array\n", |
3749 | mdname(mddev), clevel); | |
6791875e N |
3750 | rv = PTR_ERR(priv); |
3751 | goto out_unlock; | |
245f46c2 N |
3752 | } |
3753 | ||
3754 | /* Looks like we have a winner */ | |
3755 | mddev_suspend(mddev); | |
5aa61f42 | 3756 | mddev_detach(mddev); |
36d091f4 N |
3757 | |
3758 | spin_lock(&mddev->lock); | |
db721d32 N |
3759 | oldpers = mddev->pers; |
3760 | oldpriv = mddev->private; | |
3761 | mddev->pers = pers; | |
3762 | mddev->private = priv; | |
3763 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3764 | mddev->level = mddev->new_level; | |
3765 | mddev->layout = mddev->new_layout; | |
3766 | mddev->chunk_sectors = mddev->new_chunk_sectors; | |
3767 | mddev->delta_disks = 0; | |
3768 | mddev->reshape_backwards = 0; | |
3769 | mddev->degraded = 0; | |
36d091f4 | 3770 | spin_unlock(&mddev->lock); |
db721d32 N |
3771 | |
3772 | if (oldpers->sync_request == NULL && | |
3773 | mddev->external) { | |
3774 | /* We are converting from a no-redundancy array | |
3775 | * to a redundancy array and metadata is managed | |
3776 | * externally so we need to be sure that writes | |
3777 | * won't block due to a need to transition | |
3778 | * clean->dirty | |
3779 | * until external management is started. | |
3780 | */ | |
3781 | mddev->in_sync = 0; | |
3782 | mddev->safemode_delay = 0; | |
3783 | mddev->safemode = 0; | |
3784 | } | |
f72ffdd6 | 3785 | |
db721d32 N |
3786 | oldpers->free(mddev, oldpriv); |
3787 | ||
3788 | if (oldpers->sync_request == NULL && | |
a64c876f N |
3789 | pers->sync_request != NULL) { |
3790 | /* need to add the md_redundancy_group */ | |
3791 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
9d48739e N |
3792 | pr_warn("md: cannot register extra attributes for %s\n", |
3793 | mdname(mddev)); | |
388975cc | 3794 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
f72ffdd6 | 3795 | } |
db721d32 | 3796 | if (oldpers->sync_request != NULL && |
a64c876f N |
3797 | pers->sync_request == NULL) { |
3798 | /* need to remove the md_redundancy_group */ | |
3799 | if (mddev->to_remove == NULL) | |
3800 | mddev->to_remove = &md_redundancy_group; | |
3801 | } | |
3802 | ||
4cb9da7d AO |
3803 | module_put(oldpers->owner); |
3804 | ||
dafb20fa | 3805 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3806 | if (rdev->raid_disk < 0) |
3807 | continue; | |
bf2cb0da | 3808 | if (rdev->new_raid_disk >= mddev->raid_disks) |
e93f68a1 N |
3809 | rdev->new_raid_disk = -1; |
3810 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3811 | continue; | |
36fad858 | 3812 | sysfs_unlink_rdev(mddev, rdev); |
e93f68a1 | 3813 | } |
dafb20fa | 3814 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3815 | if (rdev->raid_disk < 0) |
3816 | continue; | |
3817 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3818 | continue; | |
3819 | rdev->raid_disk = rdev->new_raid_disk; | |
3820 | if (rdev->raid_disk < 0) | |
3a981b03 | 3821 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 | 3822 | else { |
36fad858 | 3823 | if (sysfs_link_rdev(mddev, rdev)) |
9d48739e N |
3824 | pr_warn("md: cannot register rd%d for %s after level change\n", |
3825 | rdev->raid_disk, mdname(mddev)); | |
3a981b03 | 3826 | } |
e93f68a1 N |
3827 | } |
3828 | ||
db721d32 | 3829 | if (pers->sync_request == NULL) { |
9af204cf TM |
3830 | /* this is now an array without redundancy, so |
3831 | * it must always be in_sync | |
3832 | */ | |
3833 | mddev->in_sync = 1; | |
3834 | del_timer_sync(&mddev->safemode_timer); | |
3835 | } | |
02e5f5c0 | 3836 | blk_set_stacking_limits(&mddev->queue->limits); |
245f46c2 | 3837 | pers->run(mddev); |
2953079c | 3838 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
47525e59 | 3839 | mddev_resume(mddev); |
830778a1 N |
3840 | if (!mddev->thread) |
3841 | md_update_sb(mddev, 1); | |
5cac7861 | 3842 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3843 | md_new_event(mddev); |
6791875e N |
3844 | rv = len; |
3845 | out_unlock: | |
3846 | mddev_unlock(mddev); | |
d9d166c2 N |
3847 | return rv; |
3848 | } | |
3849 | ||
3850 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3851 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3852 | |
d4dbd025 | 3853 | static ssize_t |
fd01b88c | 3854 | layout_show(struct mddev *mddev, char *page) |
d4dbd025 N |
3855 | { |
3856 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3857 | if (mddev->reshape_position != MaxSector && |
3858 | mddev->layout != mddev->new_layout) | |
3859 | return sprintf(page, "%d (%d)\n", | |
3860 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3861 | return sprintf(page, "%d\n", mddev->layout); |
3862 | } | |
3863 | ||
3864 | static ssize_t | |
fd01b88c | 3865 | layout_store(struct mddev *mddev, const char *buf, size_t len) |
d4dbd025 | 3866 | { |
4c9309c0 | 3867 | unsigned int n; |
6791875e | 3868 | int err; |
d4dbd025 | 3869 | |
4c9309c0 AD |
3870 | err = kstrtouint(buf, 10, &n); |
3871 | if (err < 0) | |
3872 | return err; | |
6791875e N |
3873 | err = mddev_lock(mddev); |
3874 | if (err) | |
3875 | return err; | |
d4dbd025 | 3876 | |
b3546035 | 3877 | if (mddev->pers) { |
50ac168a | 3878 | if (mddev->pers->check_reshape == NULL) |
6791875e N |
3879 | err = -EBUSY; |
3880 | else if (mddev->ro) | |
3881 | err = -EROFS; | |
3882 | else { | |
3883 | mddev->new_layout = n; | |
3884 | err = mddev->pers->check_reshape(mddev); | |
3885 | if (err) | |
3886 | mddev->new_layout = mddev->layout; | |
597a711b | 3887 | } |
b3546035 | 3888 | } else { |
08a02ecd | 3889 | mddev->new_layout = n; |
b3546035 N |
3890 | if (mddev->reshape_position == MaxSector) |
3891 | mddev->layout = n; | |
3892 | } | |
6791875e N |
3893 | mddev_unlock(mddev); |
3894 | return err ?: len; | |
d4dbd025 N |
3895 | } |
3896 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3897 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 | 3898 | |
eae1701f | 3899 | static ssize_t |
fd01b88c | 3900 | raid_disks_show(struct mddev *mddev, char *page) |
eae1701f | 3901 | { |
bb636547 N |
3902 | if (mddev->raid_disks == 0) |
3903 | return 0; | |
08a02ecd N |
3904 | if (mddev->reshape_position != MaxSector && |
3905 | mddev->delta_disks != 0) | |
3906 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3907 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3908 | return sprintf(page, "%d\n", mddev->raid_disks); |
3909 | } | |
3910 | ||
fd01b88c | 3911 | static int update_raid_disks(struct mddev *mddev, int raid_disks); |
da943b99 N |
3912 | |
3913 | static ssize_t | |
fd01b88c | 3914 | raid_disks_store(struct mddev *mddev, const char *buf, size_t len) |
da943b99 | 3915 | { |
4c9309c0 | 3916 | unsigned int n; |
6791875e | 3917 | int err; |
da943b99 | 3918 | |
4c9309c0 AD |
3919 | err = kstrtouint(buf, 10, &n); |
3920 | if (err < 0) | |
3921 | return err; | |
da943b99 | 3922 | |
6791875e N |
3923 | err = mddev_lock(mddev); |
3924 | if (err) | |
3925 | return err; | |
da943b99 | 3926 | if (mddev->pers) |
6791875e | 3927 | err = update_raid_disks(mddev, n); |
08a02ecd | 3928 | else if (mddev->reshape_position != MaxSector) { |
c6563a8c | 3929 | struct md_rdev *rdev; |
08a02ecd | 3930 | int olddisks = mddev->raid_disks - mddev->delta_disks; |
c6563a8c | 3931 | |
6791875e | 3932 | err = -EINVAL; |
c6563a8c N |
3933 | rdev_for_each(rdev, mddev) { |
3934 | if (olddisks < n && | |
3935 | rdev->data_offset < rdev->new_data_offset) | |
6791875e | 3936 | goto out_unlock; |
c6563a8c N |
3937 | if (olddisks > n && |
3938 | rdev->data_offset > rdev->new_data_offset) | |
6791875e | 3939 | goto out_unlock; |
c6563a8c | 3940 | } |
6791875e | 3941 | err = 0; |
08a02ecd N |
3942 | mddev->delta_disks = n - olddisks; |
3943 | mddev->raid_disks = n; | |
2c810cdd | 3944 | mddev->reshape_backwards = (mddev->delta_disks < 0); |
08a02ecd | 3945 | } else |
da943b99 | 3946 | mddev->raid_disks = n; |
6791875e N |
3947 | out_unlock: |
3948 | mddev_unlock(mddev); | |
3949 | return err ? err : len; | |
da943b99 N |
3950 | } |
3951 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3952 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3953 | |
3b34380a | 3954 | static ssize_t |
fd01b88c | 3955 | chunk_size_show(struct mddev *mddev, char *page) |
3b34380a | 3956 | { |
08a02ecd | 3957 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3958 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3959 | return sprintf(page, "%d (%d)\n", | |
3960 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3961 | mddev->chunk_sectors << 9); |
3962 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3963 | } |
3964 | ||
3965 | static ssize_t | |
fd01b88c | 3966 | chunk_size_store(struct mddev *mddev, const char *buf, size_t len) |
3b34380a | 3967 | { |
4c9309c0 | 3968 | unsigned long n; |
6791875e | 3969 | int err; |
3b34380a | 3970 | |
4c9309c0 AD |
3971 | err = kstrtoul(buf, 10, &n); |
3972 | if (err < 0) | |
3973 | return err; | |
3b34380a | 3974 | |
6791875e N |
3975 | err = mddev_lock(mddev); |
3976 | if (err) | |
3977 | return err; | |
b3546035 | 3978 | if (mddev->pers) { |
50ac168a | 3979 | if (mddev->pers->check_reshape == NULL) |
6791875e N |
3980 | err = -EBUSY; |
3981 | else if (mddev->ro) | |
3982 | err = -EROFS; | |
3983 | else { | |
3984 | mddev->new_chunk_sectors = n >> 9; | |
3985 | err = mddev->pers->check_reshape(mddev); | |
3986 | if (err) | |
3987 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
597a711b | 3988 | } |
b3546035 | 3989 | } else { |
664e7c41 | 3990 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3991 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3992 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3993 | } |
6791875e N |
3994 | mddev_unlock(mddev); |
3995 | return err ?: len; | |
3b34380a N |
3996 | } |
3997 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3998 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3999 | |
a94213b1 | 4000 | static ssize_t |
fd01b88c | 4001 | resync_start_show(struct mddev *mddev, char *page) |
a94213b1 | 4002 | { |
d1a7c503 N |
4003 | if (mddev->recovery_cp == MaxSector) |
4004 | return sprintf(page, "none\n"); | |
a94213b1 N |
4005 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
4006 | } | |
4007 | ||
4008 | static ssize_t | |
fd01b88c | 4009 | resync_start_store(struct mddev *mddev, const char *buf, size_t len) |
a94213b1 | 4010 | { |
4c9309c0 | 4011 | unsigned long long n; |
6791875e | 4012 | int err; |
4c9309c0 AD |
4013 | |
4014 | if (cmd_match(buf, "none")) | |
4015 | n = MaxSector; | |
4016 | else { | |
4017 | err = kstrtoull(buf, 10, &n); | |
4018 | if (err < 0) | |
4019 | return err; | |
4020 | if (n != (sector_t)n) | |
4021 | return -EINVAL; | |
4022 | } | |
a94213b1 | 4023 | |
6791875e N |
4024 | err = mddev_lock(mddev); |
4025 | if (err) | |
4026 | return err; | |
b098636c | 4027 | if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
6791875e | 4028 | err = -EBUSY; |
a94213b1 | 4029 | |
6791875e N |
4030 | if (!err) { |
4031 | mddev->recovery_cp = n; | |
4032 | if (mddev->pers) | |
2953079c | 4033 | set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); |
6791875e N |
4034 | } |
4035 | mddev_unlock(mddev); | |
4036 | return err ?: len; | |
a94213b1 N |
4037 | } |
4038 | static struct md_sysfs_entry md_resync_start = | |
750f199e N |
4039 | __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR, |
4040 | resync_start_show, resync_start_store); | |
a94213b1 | 4041 | |
9e653b63 N |
4042 | /* |
4043 | * The array state can be: | |
4044 | * | |
4045 | * clear | |
4046 | * No devices, no size, no level | |
4047 | * Equivalent to STOP_ARRAY ioctl | |
4048 | * inactive | |
4049 | * May have some settings, but array is not active | |
4050 | * all IO results in error | |
4051 | * When written, doesn't tear down array, but just stops it | |
4052 | * suspended (not supported yet) | |
4053 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 4054 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
4055 | * readonly |
4056 | * no resync can happen. no superblocks get written. | |
4057 | * write requests fail | |
4058 | * read-auto | |
4059 | * like readonly, but behaves like 'clean' on a write request. | |
4060 | * | |
4061 | * clean - no pending writes, but otherwise active. | |
4062 | * When written to inactive array, starts without resync | |
4063 | * If a write request arrives then | |
4064 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
4065 | * if not known, block and switch to write-pending | |
4066 | * If written to an active array that has pending writes, then fails. | |
4067 | * active | |
4068 | * fully active: IO and resync can be happening. | |
4069 | * When written to inactive array, starts with resync | |
4070 | * | |
4071 | * write-pending | |
4072 | * clean, but writes are blocked waiting for 'active' to be written. | |
4073 | * | |
4074 | * active-idle | |
4075 | * like active, but no writes have been seen for a while (100msec). | |
4076 | * | |
4077 | */ | |
4078 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
4079 | write_pending, active_idle, bad_word}; | |
05381954 | 4080 | static char *array_states[] = { |
9e653b63 N |
4081 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
4082 | "write-pending", "active-idle", NULL }; | |
4083 | ||
4084 | static int match_word(const char *word, char **list) | |
4085 | { | |
4086 | int n; | |
4087 | for (n=0; list[n]; n++) | |
4088 | if (cmd_match(word, list[n])) | |
4089 | break; | |
4090 | return n; | |
4091 | } | |
4092 | ||
4093 | static ssize_t | |
fd01b88c | 4094 | array_state_show(struct mddev *mddev, char *page) |
9e653b63 N |
4095 | { |
4096 | enum array_state st = inactive; | |
4097 | ||
4098 | if (mddev->pers) | |
4099 | switch(mddev->ro) { | |
4100 | case 1: | |
4101 | st = readonly; | |
4102 | break; | |
4103 | case 2: | |
4104 | st = read_auto; | |
4105 | break; | |
4106 | case 0: | |
55cc39f3 | 4107 | spin_lock(&mddev->lock); |
2953079c | 4108 | if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) |
e691063a | 4109 | st = write_pending; |
16f88949 TM |
4110 | else if (mddev->in_sync) |
4111 | st = clean; | |
9e653b63 N |
4112 | else if (mddev->safemode) |
4113 | st = active_idle; | |
4114 | else | |
4115 | st = active; | |
55cc39f3 | 4116 | spin_unlock(&mddev->lock); |
9e653b63 N |
4117 | } |
4118 | else { | |
4119 | if (list_empty(&mddev->disks) && | |
4120 | mddev->raid_disks == 0 && | |
58c0fed4 | 4121 | mddev->dev_sectors == 0) |
9e653b63 N |
4122 | st = clear; |
4123 | else | |
4124 | st = inactive; | |
4125 | } | |
4126 | return sprintf(page, "%s\n", array_states[st]); | |
4127 | } | |
4128 | ||
f72ffdd6 N |
4129 | static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev); |
4130 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev); | |
4131 | static int do_md_run(struct mddev *mddev); | |
fd01b88c | 4132 | static int restart_array(struct mddev *mddev); |
9e653b63 N |
4133 | |
4134 | static ssize_t | |
fd01b88c | 4135 | array_state_store(struct mddev *mddev, const char *buf, size_t len) |
9e653b63 | 4136 | { |
6497709b | 4137 | int err = 0; |
9e653b63 | 4138 | enum array_state st = match_word(buf, array_states); |
6791875e N |
4139 | |
4140 | if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) { | |
4141 | /* don't take reconfig_mutex when toggling between | |
4142 | * clean and active | |
4143 | */ | |
4144 | spin_lock(&mddev->lock); | |
4145 | if (st == active) { | |
4146 | restart_array(mddev); | |
2953079c | 4147 | clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); |
91a6c4ad | 4148 | md_wakeup_thread(mddev->thread); |
6791875e | 4149 | wake_up(&mddev->sb_wait); |
6791875e N |
4150 | } else /* st == clean */ { |
4151 | restart_array(mddev); | |
6497709b | 4152 | if (!set_in_sync(mddev)) |
6791875e N |
4153 | err = -EBUSY; |
4154 | } | |
573275b5 TM |
4155 | if (!err) |
4156 | sysfs_notify_dirent_safe(mddev->sysfs_state); | |
6791875e | 4157 | spin_unlock(&mddev->lock); |
c008f1d3 | 4158 | return err ?: len; |
6791875e N |
4159 | } |
4160 | err = mddev_lock(mddev); | |
4161 | if (err) | |
4162 | return err; | |
4163 | err = -EINVAL; | |
9e653b63 N |
4164 | switch(st) { |
4165 | case bad_word: | |
4166 | break; | |
4167 | case clear: | |
4168 | /* stopping an active array */ | |
a05b7ea0 | 4169 | err = do_md_stop(mddev, 0, NULL); |
9e653b63 N |
4170 | break; |
4171 | case inactive: | |
4172 | /* stopping an active array */ | |
90cf195d | 4173 | if (mddev->pers) |
a05b7ea0 | 4174 | err = do_md_stop(mddev, 2, NULL); |
90cf195d | 4175 | else |
e691063a | 4176 | err = 0; /* already inactive */ |
9e653b63 N |
4177 | break; |
4178 | case suspended: | |
4179 | break; /* not supported yet */ | |
4180 | case readonly: | |
4181 | if (mddev->pers) | |
a05b7ea0 | 4182 | err = md_set_readonly(mddev, NULL); |
9e653b63 N |
4183 | else { |
4184 | mddev->ro = 1; | |
648b629e | 4185 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
4186 | err = do_md_run(mddev); |
4187 | } | |
4188 | break; | |
4189 | case read_auto: | |
9e653b63 | 4190 | if (mddev->pers) { |
80268ee9 | 4191 | if (mddev->ro == 0) |
a05b7ea0 | 4192 | err = md_set_readonly(mddev, NULL); |
80268ee9 | 4193 | else if (mddev->ro == 1) |
648b629e N |
4194 | err = restart_array(mddev); |
4195 | if (err == 0) { | |
4196 | mddev->ro = 2; | |
4197 | set_disk_ro(mddev->gendisk, 0); | |
4198 | } | |
9e653b63 N |
4199 | } else { |
4200 | mddev->ro = 2; | |
4201 | err = do_md_run(mddev); | |
4202 | } | |
4203 | break; | |
4204 | case clean: | |
4205 | if (mddev->pers) { | |
339421de SL |
4206 | err = restart_array(mddev); |
4207 | if (err) | |
4208 | break; | |
85572d7c | 4209 | spin_lock(&mddev->lock); |
6497709b | 4210 | if (!set_in_sync(mddev)) |
e691063a | 4211 | err = -EBUSY; |
85572d7c | 4212 | spin_unlock(&mddev->lock); |
5bf29597 N |
4213 | } else |
4214 | err = -EINVAL; | |
9e653b63 N |
4215 | break; |
4216 | case active: | |
4217 | if (mddev->pers) { | |
339421de SL |
4218 | err = restart_array(mddev); |
4219 | if (err) | |
4220 | break; | |
2953079c | 4221 | clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); |
9e653b63 N |
4222 | wake_up(&mddev->sb_wait); |
4223 | err = 0; | |
4224 | } else { | |
4225 | mddev->ro = 0; | |
648b629e | 4226 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
4227 | err = do_md_run(mddev); |
4228 | } | |
4229 | break; | |
4230 | case write_pending: | |
4231 | case active_idle: | |
4232 | /* these cannot be set */ | |
4233 | break; | |
4234 | } | |
6791875e N |
4235 | |
4236 | if (!err) { | |
1d23f178 N |
4237 | if (mddev->hold_active == UNTIL_IOCTL) |
4238 | mddev->hold_active = 0; | |
00bcb4ac | 4239 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4240 | } |
6791875e N |
4241 | mddev_unlock(mddev); |
4242 | return err ?: len; | |
9e653b63 | 4243 | } |
80ca3a44 | 4244 | static struct md_sysfs_entry md_array_state = |
750f199e | 4245 | __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); |
9e653b63 | 4246 | |
1e50915f | 4247 | static ssize_t |
fd01b88c | 4248 | max_corrected_read_errors_show(struct mddev *mddev, char *page) { |
1e50915f RB |
4249 | return sprintf(page, "%d\n", |
4250 | atomic_read(&mddev->max_corr_read_errors)); | |
4251 | } | |
4252 | ||
4253 | static ssize_t | |
fd01b88c | 4254 | max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) |
1e50915f | 4255 | { |
4c9309c0 AD |
4256 | unsigned int n; |
4257 | int rv; | |
1e50915f | 4258 | |
4c9309c0 AD |
4259 | rv = kstrtouint(buf, 10, &n); |
4260 | if (rv < 0) | |
4261 | return rv; | |
4262 | atomic_set(&mddev->max_corr_read_errors, n); | |
4263 | return len; | |
1e50915f RB |
4264 | } |
4265 | ||
4266 | static struct md_sysfs_entry max_corr_read_errors = | |
4267 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
4268 | max_corrected_read_errors_store); | |
4269 | ||
6d7ff738 | 4270 | static ssize_t |
fd01b88c | 4271 | null_show(struct mddev *mddev, char *page) |
6d7ff738 N |
4272 | { |
4273 | return -EINVAL; | |
4274 | } | |
4275 | ||
4276 | static ssize_t | |
fd01b88c | 4277 | new_dev_store(struct mddev *mddev, const char *buf, size_t len) |
6d7ff738 N |
4278 | { |
4279 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
4280 | /* The new device is added to the array. | |
4281 | * If the array has a persistent superblock, we read the | |
4282 | * superblock to initialise info and check validity. | |
4283 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
4284 | * which mainly checks size. | |
4285 | */ | |
4286 | char *e; | |
4287 | int major = simple_strtoul(buf, &e, 10); | |
4288 | int minor; | |
4289 | dev_t dev; | |
3cb03002 | 4290 | struct md_rdev *rdev; |
6d7ff738 N |
4291 | int err; |
4292 | ||
4293 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
4294 | return -EINVAL; | |
4295 | minor = simple_strtoul(e+1, &e, 10); | |
4296 | if (*e && *e != '\n') | |
4297 | return -EINVAL; | |
4298 | dev = MKDEV(major, minor); | |
4299 | if (major != MAJOR(dev) || | |
4300 | minor != MINOR(dev)) | |
4301 | return -EOVERFLOW; | |
4302 | ||
6791875e N |
4303 | flush_workqueue(md_misc_wq); |
4304 | ||
4305 | err = mddev_lock(mddev); | |
4306 | if (err) | |
4307 | return err; | |
6d7ff738 N |
4308 | if (mddev->persistent) { |
4309 | rdev = md_import_device(dev, mddev->major_version, | |
4310 | mddev->minor_version); | |
4311 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3cb03002 N |
4312 | struct md_rdev *rdev0 |
4313 | = list_entry(mddev->disks.next, | |
4314 | struct md_rdev, same_set); | |
6d7ff738 N |
4315 | err = super_types[mddev->major_version] |
4316 | .load_super(rdev, rdev0, mddev->minor_version); | |
4317 | if (err < 0) | |
4318 | goto out; | |
4319 | } | |
c5d79adb N |
4320 | } else if (mddev->external) |
4321 | rdev = md_import_device(dev, -2, -1); | |
4322 | else | |
6d7ff738 N |
4323 | rdev = md_import_device(dev, -1, -1); |
4324 | ||
9a8c0fa8 N |
4325 | if (IS_ERR(rdev)) { |
4326 | mddev_unlock(mddev); | |
6d7ff738 | 4327 | return PTR_ERR(rdev); |
9a8c0fa8 | 4328 | } |
6d7ff738 N |
4329 | err = bind_rdev_to_array(rdev, mddev); |
4330 | out: | |
4331 | if (err) | |
4332 | export_rdev(rdev); | |
6791875e | 4333 | mddev_unlock(mddev); |
5492c46e AO |
4334 | if (!err) |
4335 | md_new_event(mddev); | |
6d7ff738 N |
4336 | return err ? err : len; |
4337 | } | |
4338 | ||
4339 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 4340 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 4341 | |
9b1d1dac | 4342 | static ssize_t |
fd01b88c | 4343 | bitmap_store(struct mddev *mddev, const char *buf, size_t len) |
9b1d1dac PC |
4344 | { |
4345 | char *end; | |
4346 | unsigned long chunk, end_chunk; | |
6791875e | 4347 | int err; |
9b1d1dac | 4348 | |
6791875e N |
4349 | err = mddev_lock(mddev); |
4350 | if (err) | |
4351 | return err; | |
9b1d1dac PC |
4352 | if (!mddev->bitmap) |
4353 | goto out; | |
4354 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
4355 | while (*buf) { | |
4356 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
4357 | if (buf == end) break; | |
4358 | if (*end == '-') { /* range */ | |
4359 | buf = end + 1; | |
4360 | end_chunk = simple_strtoul(buf, &end, 0); | |
4361 | if (buf == end) break; | |
4362 | } | |
4363 | if (*end && !isspace(*end)) break; | |
4364 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 4365 | buf = skip_spaces(end); |
9b1d1dac PC |
4366 | } |
4367 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
4368 | out: | |
6791875e | 4369 | mddev_unlock(mddev); |
9b1d1dac PC |
4370 | return len; |
4371 | } | |
4372 | ||
4373 | static struct md_sysfs_entry md_bitmap = | |
4374 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
4375 | ||
a35b0d69 | 4376 | static ssize_t |
fd01b88c | 4377 | size_show(struct mddev *mddev, char *page) |
a35b0d69 | 4378 | { |
58c0fed4 AN |
4379 | return sprintf(page, "%llu\n", |
4380 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
4381 | } |
4382 | ||
fd01b88c | 4383 | static int update_size(struct mddev *mddev, sector_t num_sectors); |
a35b0d69 N |
4384 | |
4385 | static ssize_t | |
fd01b88c | 4386 | size_store(struct mddev *mddev, const char *buf, size_t len) |
a35b0d69 N |
4387 | { |
4388 | /* If array is inactive, we can reduce the component size, but | |
4389 | * not increase it (except from 0). | |
4390 | * If array is active, we can try an on-line resize | |
4391 | */ | |
b522adcd DW |
4392 | sector_t sectors; |
4393 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 4394 | |
58c0fed4 AN |
4395 | if (err < 0) |
4396 | return err; | |
6791875e N |
4397 | err = mddev_lock(mddev); |
4398 | if (err) | |
4399 | return err; | |
a35b0d69 | 4400 | if (mddev->pers) { |
58c0fed4 | 4401 | err = update_size(mddev, sectors); |
4ba1e788 XN |
4402 | if (err == 0) |
4403 | md_update_sb(mddev, 1); | |
a35b0d69 | 4404 | } else { |
58c0fed4 AN |
4405 | if (mddev->dev_sectors == 0 || |
4406 | mddev->dev_sectors > sectors) | |
4407 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
4408 | else |
4409 | err = -ENOSPC; | |
4410 | } | |
6791875e | 4411 | mddev_unlock(mddev); |
a35b0d69 N |
4412 | return err ? err : len; |
4413 | } | |
4414 | ||
4415 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 4416 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 4417 | |
83f0d77a | 4418 | /* Metadata version. |
e691063a N |
4419 | * This is one of |
4420 | * 'none' for arrays with no metadata (good luck...) | |
4421 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
4422 | * or N.M for internally known formats |
4423 | */ | |
4424 | static ssize_t | |
fd01b88c | 4425 | metadata_show(struct mddev *mddev, char *page) |
8bb93aac N |
4426 | { |
4427 | if (mddev->persistent) | |
4428 | return sprintf(page, "%d.%d\n", | |
4429 | mddev->major_version, mddev->minor_version); | |
e691063a N |
4430 | else if (mddev->external) |
4431 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
4432 | else |
4433 | return sprintf(page, "none\n"); | |
4434 | } | |
4435 | ||
4436 | static ssize_t | |
fd01b88c | 4437 | metadata_store(struct mddev *mddev, const char *buf, size_t len) |
8bb93aac N |
4438 | { |
4439 | int major, minor; | |
4440 | char *e; | |
6791875e | 4441 | int err; |
ea43ddd8 N |
4442 | /* Changing the details of 'external' metadata is |
4443 | * always permitted. Otherwise there must be | |
4444 | * no devices attached to the array. | |
4445 | */ | |
6791875e N |
4446 | |
4447 | err = mddev_lock(mddev); | |
4448 | if (err) | |
4449 | return err; | |
4450 | err = -EBUSY; | |
ea43ddd8 N |
4451 | if (mddev->external && strncmp(buf, "external:", 9) == 0) |
4452 | ; | |
4453 | else if (!list_empty(&mddev->disks)) | |
6791875e | 4454 | goto out_unlock; |
8bb93aac | 4455 | |
6791875e | 4456 | err = 0; |
8bb93aac N |
4457 | if (cmd_match(buf, "none")) { |
4458 | mddev->persistent = 0; | |
e691063a N |
4459 | mddev->external = 0; |
4460 | mddev->major_version = 0; | |
4461 | mddev->minor_version = 90; | |
6791875e | 4462 | goto out_unlock; |
e691063a N |
4463 | } |
4464 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 4465 | size_t namelen = len-9; |
e691063a N |
4466 | if (namelen >= sizeof(mddev->metadata_type)) |
4467 | namelen = sizeof(mddev->metadata_type)-1; | |
4468 | strncpy(mddev->metadata_type, buf+9, namelen); | |
4469 | mddev->metadata_type[namelen] = 0; | |
4470 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
4471 | mddev->metadata_type[--namelen] = 0; | |
4472 | mddev->persistent = 0; | |
4473 | mddev->external = 1; | |
8bb93aac N |
4474 | mddev->major_version = 0; |
4475 | mddev->minor_version = 90; | |
6791875e | 4476 | goto out_unlock; |
8bb93aac N |
4477 | } |
4478 | major = simple_strtoul(buf, &e, 10); | |
6791875e | 4479 | err = -EINVAL; |
8bb93aac | 4480 | if (e==buf || *e != '.') |
6791875e | 4481 | goto out_unlock; |
8bb93aac N |
4482 | buf = e+1; |
4483 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 4484 | if (e==buf || (*e && *e != '\n') ) |
6791875e N |
4485 | goto out_unlock; |
4486 | err = -ENOENT; | |
50511da3 | 4487 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
6791875e | 4488 | goto out_unlock; |
8bb93aac N |
4489 | mddev->major_version = major; |
4490 | mddev->minor_version = minor; | |
4491 | mddev->persistent = 1; | |
e691063a | 4492 | mddev->external = 0; |
6791875e N |
4493 | err = 0; |
4494 | out_unlock: | |
4495 | mddev_unlock(mddev); | |
4496 | return err ?: len; | |
8bb93aac N |
4497 | } |
4498 | ||
4499 | static struct md_sysfs_entry md_metadata = | |
750f199e | 4500 | __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 4501 | |
24dd469d | 4502 | static ssize_t |
fd01b88c | 4503 | action_show(struct mddev *mddev, char *page) |
24dd469d | 4504 | { |
7eec314d | 4505 | char *type = "idle"; |
b7b17c9b N |
4506 | unsigned long recovery = mddev->recovery; |
4507 | if (test_bit(MD_RECOVERY_FROZEN, &recovery)) | |
b6a9ce68 | 4508 | type = "frozen"; |
b7b17c9b N |
4509 | else if (test_bit(MD_RECOVERY_RUNNING, &recovery) || |
4510 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) { | |
4511 | if (test_bit(MD_RECOVERY_RESHAPE, &recovery)) | |
ccfcc3c1 | 4512 | type = "reshape"; |
b7b17c9b N |
4513 | else if (test_bit(MD_RECOVERY_SYNC, &recovery)) { |
4514 | if (!test_bit(MD_RECOVERY_REQUESTED, &recovery)) | |
24dd469d | 4515 | type = "resync"; |
b7b17c9b | 4516 | else if (test_bit(MD_RECOVERY_CHECK, &recovery)) |
24dd469d N |
4517 | type = "check"; |
4518 | else | |
4519 | type = "repair"; | |
b7b17c9b | 4520 | } else if (test_bit(MD_RECOVERY_RECOVER, &recovery)) |
24dd469d | 4521 | type = "recover"; |
985ca973 N |
4522 | else if (mddev->reshape_position != MaxSector) |
4523 | type = "reshape"; | |
24dd469d N |
4524 | } |
4525 | return sprintf(page, "%s\n", type); | |
4526 | } | |
4527 | ||
4528 | static ssize_t | |
fd01b88c | 4529 | action_store(struct mddev *mddev, const char *page, size_t len) |
24dd469d | 4530 | { |
7eec314d N |
4531 | if (!mddev->pers || !mddev->pers->sync_request) |
4532 | return -EINVAL; | |
4533 | ||
b6a9ce68 N |
4534 | |
4535 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
56ccc112 N |
4536 | if (cmd_match(page, "frozen")) |
4537 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4538 | else | |
4539 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
8e8e2518 N |
4540 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
4541 | mddev_lock(mddev) == 0) { | |
4542 | flush_workqueue(md_misc_wq); | |
4543 | if (mddev->sync_thread) { | |
4544 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6791875e | 4545 | md_reap_sync_thread(mddev); |
6791875e | 4546 | } |
8e8e2518 | 4547 | mddev_unlock(mddev); |
7eec314d | 4548 | } |
312045ee | 4549 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
24dd469d | 4550 | return -EBUSY; |
72a23c21 | 4551 | else if (cmd_match(page, "resync")) |
56ccc112 | 4552 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
72a23c21 | 4553 | else if (cmd_match(page, "recover")) { |
56ccc112 | 4554 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
72a23c21 | 4555 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
72a23c21 | 4556 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
4557 | int err; |
4558 | if (mddev->pers->start_reshape == NULL) | |
4559 | return -EINVAL; | |
6791875e N |
4560 | err = mddev_lock(mddev); |
4561 | if (!err) { | |
312045ee N |
4562 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4563 | err = -EBUSY; | |
4564 | else { | |
4565 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4566 | err = mddev->pers->start_reshape(mddev); | |
4567 | } | |
6791875e N |
4568 | mddev_unlock(mddev); |
4569 | } | |
16484bf5 N |
4570 | if (err) |
4571 | return err; | |
a99ac971 | 4572 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 4573 | } else { |
bce74dac | 4574 | if (cmd_match(page, "check")) |
7eec314d | 4575 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 4576 | else if (!cmd_match(page, "repair")) |
7eec314d | 4577 | return -EINVAL; |
56ccc112 | 4578 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
7eec314d N |
4579 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
4580 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 4581 | } |
48c26ddc N |
4582 | if (mddev->ro == 2) { |
4583 | /* A write to sync_action is enough to justify | |
4584 | * canceling read-auto mode | |
4585 | */ | |
4586 | mddev->ro = 0; | |
4587 | md_wakeup_thread(mddev->sync_thread); | |
4588 | } | |
03c902e1 | 4589 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 4590 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 4591 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
4592 | return len; |
4593 | } | |
4594 | ||
c4a39551 | 4595 | static struct md_sysfs_entry md_scan_mode = |
750f199e | 4596 | __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); |
c4a39551 JB |
4597 | |
4598 | static ssize_t | |
4599 | last_sync_action_show(struct mddev *mddev, char *page) | |
4600 | { | |
4601 | return sprintf(page, "%s\n", mddev->last_sync_action); | |
4602 | } | |
4603 | ||
4604 | static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action); | |
4605 | ||
9d88883e | 4606 | static ssize_t |
fd01b88c | 4607 | mismatch_cnt_show(struct mddev *mddev, char *page) |
9d88883e N |
4608 | { |
4609 | return sprintf(page, "%llu\n", | |
7f7583d4 JM |
4610 | (unsigned long long) |
4611 | atomic64_read(&mddev->resync_mismatches)); | |
9d88883e N |
4612 | } |
4613 | ||
80ca3a44 | 4614 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 4615 | |
88202a0c | 4616 | static ssize_t |
fd01b88c | 4617 | sync_min_show(struct mddev *mddev, char *page) |
88202a0c N |
4618 | { |
4619 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
4620 | mddev->sync_speed_min ? "local": "system"); | |
4621 | } | |
4622 | ||
4623 | static ssize_t | |
fd01b88c | 4624 | sync_min_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c | 4625 | { |
4c9309c0 AD |
4626 | unsigned int min; |
4627 | int rv; | |
4628 | ||
88202a0c | 4629 | if (strncmp(buf, "system", 6)==0) { |
4c9309c0 AD |
4630 | min = 0; |
4631 | } else { | |
4632 | rv = kstrtouint(buf, 10, &min); | |
4633 | if (rv < 0) | |
4634 | return rv; | |
4635 | if (min == 0) | |
4636 | return -EINVAL; | |
88202a0c | 4637 | } |
88202a0c N |
4638 | mddev->sync_speed_min = min; |
4639 | return len; | |
4640 | } | |
4641 | ||
4642 | static struct md_sysfs_entry md_sync_min = | |
4643 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
4644 | ||
4645 | static ssize_t | |
fd01b88c | 4646 | sync_max_show(struct mddev *mddev, char *page) |
88202a0c N |
4647 | { |
4648 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
4649 | mddev->sync_speed_max ? "local": "system"); | |
4650 | } | |
4651 | ||
4652 | static ssize_t | |
fd01b88c | 4653 | sync_max_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c | 4654 | { |
4c9309c0 AD |
4655 | unsigned int max; |
4656 | int rv; | |
4657 | ||
88202a0c | 4658 | if (strncmp(buf, "system", 6)==0) { |
4c9309c0 AD |
4659 | max = 0; |
4660 | } else { | |
4661 | rv = kstrtouint(buf, 10, &max); | |
4662 | if (rv < 0) | |
4663 | return rv; | |
4664 | if (max == 0) | |
4665 | return -EINVAL; | |
88202a0c | 4666 | } |
88202a0c N |
4667 | mddev->sync_speed_max = max; |
4668 | return len; | |
4669 | } | |
4670 | ||
4671 | static struct md_sysfs_entry md_sync_max = | |
4672 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
4673 | ||
d7f3d291 | 4674 | static ssize_t |
fd01b88c | 4675 | degraded_show(struct mddev *mddev, char *page) |
d7f3d291 IP |
4676 | { |
4677 | return sprintf(page, "%d\n", mddev->degraded); | |
4678 | } | |
4679 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 4680 | |
90b08710 | 4681 | static ssize_t |
fd01b88c | 4682 | sync_force_parallel_show(struct mddev *mddev, char *page) |
90b08710 BS |
4683 | { |
4684 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
4685 | } | |
4686 | ||
4687 | static ssize_t | |
fd01b88c | 4688 | sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) |
90b08710 BS |
4689 | { |
4690 | long n; | |
4691 | ||
b29bebd6 | 4692 | if (kstrtol(buf, 10, &n)) |
90b08710 BS |
4693 | return -EINVAL; |
4694 | ||
4695 | if (n != 0 && n != 1) | |
4696 | return -EINVAL; | |
4697 | ||
4698 | mddev->parallel_resync = n; | |
4699 | ||
4700 | if (mddev->sync_thread) | |
4701 | wake_up(&resync_wait); | |
4702 | ||
4703 | return len; | |
4704 | } | |
4705 | ||
4706 | /* force parallel resync, even with shared block devices */ | |
4707 | static struct md_sysfs_entry md_sync_force_parallel = | |
4708 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
4709 | sync_force_parallel_show, sync_force_parallel_store); | |
4710 | ||
88202a0c | 4711 | static ssize_t |
fd01b88c | 4712 | sync_speed_show(struct mddev *mddev, char *page) |
88202a0c N |
4713 | { |
4714 | unsigned long resync, dt, db; | |
d1a7c503 N |
4715 | if (mddev->curr_resync == 0) |
4716 | return sprintf(page, "none\n"); | |
9687a60c AN |
4717 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
4718 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 4719 | if (!dt) dt++; |
9687a60c AN |
4720 | db = resync - mddev->resync_mark_cnt; |
4721 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
4722 | } |
4723 | ||
80ca3a44 | 4724 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
4725 | |
4726 | static ssize_t | |
fd01b88c | 4727 | sync_completed_show(struct mddev *mddev, char *page) |
88202a0c | 4728 | { |
13ae864b | 4729 | unsigned long long max_sectors, resync; |
88202a0c | 4730 | |
acb180b0 N |
4731 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4732 | return sprintf(page, "none\n"); | |
4733 | ||
72f36d59 N |
4734 | if (mddev->curr_resync == 1 || |
4735 | mddev->curr_resync == 2) | |
4736 | return sprintf(page, "delayed\n"); | |
4737 | ||
c804cdec N |
4738 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
4739 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
58c0fed4 | 4740 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 4741 | else |
58c0fed4 | 4742 | max_sectors = mddev->dev_sectors; |
88202a0c | 4743 | |
acb180b0 | 4744 | resync = mddev->curr_resync_completed; |
13ae864b | 4745 | return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
88202a0c N |
4746 | } |
4747 | ||
750f199e N |
4748 | static struct md_sysfs_entry md_sync_completed = |
4749 | __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL); | |
88202a0c | 4750 | |
5e96ee65 | 4751 | static ssize_t |
fd01b88c | 4752 | min_sync_show(struct mddev *mddev, char *page) |
5e96ee65 NB |
4753 | { |
4754 | return sprintf(page, "%llu\n", | |
4755 | (unsigned long long)mddev->resync_min); | |
4756 | } | |
4757 | static ssize_t | |
fd01b88c | 4758 | min_sync_store(struct mddev *mddev, const char *buf, size_t len) |
5e96ee65 NB |
4759 | { |
4760 | unsigned long long min; | |
23da422b | 4761 | int err; |
23da422b | 4762 | |
b29bebd6 | 4763 | if (kstrtoull(buf, 10, &min)) |
5e96ee65 | 4764 | return -EINVAL; |
23da422b N |
4765 | |
4766 | spin_lock(&mddev->lock); | |
4767 | err = -EINVAL; | |
5e96ee65 | 4768 | if (min > mddev->resync_max) |
23da422b N |
4769 | goto out_unlock; |
4770 | ||
4771 | err = -EBUSY; | |
5e96ee65 | 4772 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
23da422b | 4773 | goto out_unlock; |
5e96ee65 | 4774 | |
50c37b13 N |
4775 | /* Round down to multiple of 4K for safety */ |
4776 | mddev->resync_min = round_down(min, 8); | |
23da422b | 4777 | err = 0; |
5e96ee65 | 4778 | |
23da422b N |
4779 | out_unlock: |
4780 | spin_unlock(&mddev->lock); | |
4781 | return err ?: len; | |
5e96ee65 NB |
4782 | } |
4783 | ||
4784 | static struct md_sysfs_entry md_min_sync = | |
4785 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
4786 | ||
c6207277 | 4787 | static ssize_t |
fd01b88c | 4788 | max_sync_show(struct mddev *mddev, char *page) |
c6207277 N |
4789 | { |
4790 | if (mddev->resync_max == MaxSector) | |
4791 | return sprintf(page, "max\n"); | |
4792 | else | |
4793 | return sprintf(page, "%llu\n", | |
4794 | (unsigned long long)mddev->resync_max); | |
4795 | } | |
4796 | static ssize_t | |
fd01b88c | 4797 | max_sync_store(struct mddev *mddev, const char *buf, size_t len) |
c6207277 | 4798 | { |
23da422b N |
4799 | int err; |
4800 | spin_lock(&mddev->lock); | |
c6207277 N |
4801 | if (strncmp(buf, "max", 3) == 0) |
4802 | mddev->resync_max = MaxSector; | |
4803 | else { | |
5e96ee65 | 4804 | unsigned long long max; |
23da422b N |
4805 | int chunk; |
4806 | ||
4807 | err = -EINVAL; | |
b29bebd6 | 4808 | if (kstrtoull(buf, 10, &max)) |
23da422b | 4809 | goto out_unlock; |
5e96ee65 | 4810 | if (max < mddev->resync_min) |
23da422b N |
4811 | goto out_unlock; |
4812 | ||
4813 | err = -EBUSY; | |
c6207277 | 4814 | if (max < mddev->resync_max && |
4d484a4a | 4815 | mddev->ro == 0 && |
c6207277 | 4816 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
23da422b | 4817 | goto out_unlock; |
c6207277 N |
4818 | |
4819 | /* Must be a multiple of chunk_size */ | |
23da422b N |
4820 | chunk = mddev->chunk_sectors; |
4821 | if (chunk) { | |
2ac06c33 | 4822 | sector_t temp = max; |
23da422b N |
4823 | |
4824 | err = -EINVAL; | |
4825 | if (sector_div(temp, chunk)) | |
4826 | goto out_unlock; | |
c6207277 N |
4827 | } |
4828 | mddev->resync_max = max; | |
4829 | } | |
4830 | wake_up(&mddev->recovery_wait); | |
23da422b N |
4831 | err = 0; |
4832 | out_unlock: | |
4833 | spin_unlock(&mddev->lock); | |
4834 | return err ?: len; | |
c6207277 N |
4835 | } |
4836 | ||
4837 | static struct md_sysfs_entry md_max_sync = | |
4838 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4839 | ||
e464eafd | 4840 | static ssize_t |
fd01b88c | 4841 | suspend_lo_show(struct mddev *mddev, char *page) |
e464eafd N |
4842 | { |
4843 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4844 | } | |
4845 | ||
4846 | static ssize_t | |
fd01b88c | 4847 | suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd | 4848 | { |
4c9309c0 | 4849 | unsigned long long old, new; |
6791875e | 4850 | int err; |
e464eafd | 4851 | |
4c9309c0 AD |
4852 | err = kstrtoull(buf, 10, &new); |
4853 | if (err < 0) | |
4854 | return err; | |
4855 | if (new != (sector_t)new) | |
e464eafd | 4856 | return -EINVAL; |
23ddff37 | 4857 | |
6791875e N |
4858 | err = mddev_lock(mddev); |
4859 | if (err) | |
4860 | return err; | |
4861 | err = -EINVAL; | |
4862 | if (mddev->pers == NULL || | |
4863 | mddev->pers->quiesce == NULL) | |
4864 | goto unlock; | |
4865 | old = mddev->suspend_lo; | |
23ddff37 | 4866 | mddev->suspend_lo = new; |
b3143b9a | 4867 | if (new >= old) { |
23ddff37 | 4868 | /* Shrinking suspended region */ |
b3143b9a | 4869 | wake_up(&mddev->sb_wait); |
e464eafd | 4870 | mddev->pers->quiesce(mddev, 2); |
b3143b9a | 4871 | } else { |
23ddff37 | 4872 | /* Expanding suspended region - need to wait */ |
9e1cc0a5 N |
4873 | mddev_suspend(mddev); |
4874 | mddev_resume(mddev); | |
23ddff37 | 4875 | } |
6791875e N |
4876 | err = 0; |
4877 | unlock: | |
4878 | mddev_unlock(mddev); | |
4879 | return err ?: len; | |
e464eafd N |
4880 | } |
4881 | static struct md_sysfs_entry md_suspend_lo = | |
4882 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4883 | ||
e464eafd | 4884 | static ssize_t |
fd01b88c | 4885 | suspend_hi_show(struct mddev *mddev, char *page) |
e464eafd N |
4886 | { |
4887 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4888 | } | |
4889 | ||
4890 | static ssize_t | |
fd01b88c | 4891 | suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd | 4892 | { |
4c9309c0 | 4893 | unsigned long long old, new; |
6791875e | 4894 | int err; |
e464eafd | 4895 | |
4c9309c0 AD |
4896 | err = kstrtoull(buf, 10, &new); |
4897 | if (err < 0) | |
4898 | return err; | |
4899 | if (new != (sector_t)new) | |
e464eafd | 4900 | return -EINVAL; |
23ddff37 | 4901 | |
6791875e N |
4902 | err = mddev_lock(mddev); |
4903 | if (err) | |
4904 | return err; | |
4905 | err = -EINVAL; | |
4906 | if (mddev->pers == NULL || | |
4907 | mddev->pers->quiesce == NULL) | |
4908 | goto unlock; | |
4909 | old = mddev->suspend_hi; | |
23ddff37 | 4910 | mddev->suspend_hi = new; |
b3143b9a | 4911 | if (new <= old) { |
23ddff37 | 4912 | /* Shrinking suspended region */ |
b3143b9a | 4913 | wake_up(&mddev->sb_wait); |
23ddff37 | 4914 | mddev->pers->quiesce(mddev, 2); |
b3143b9a | 4915 | } else { |
23ddff37 | 4916 | /* Expanding suspended region - need to wait */ |
9e1cc0a5 N |
4917 | mddev_suspend(mddev); |
4918 | mddev_resume(mddev); | |
23ddff37 | 4919 | } |
6791875e N |
4920 | err = 0; |
4921 | unlock: | |
4922 | mddev_unlock(mddev); | |
4923 | return err ?: len; | |
e464eafd N |
4924 | } |
4925 | static struct md_sysfs_entry md_suspend_hi = | |
4926 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4927 | ||
08a02ecd | 4928 | static ssize_t |
fd01b88c | 4929 | reshape_position_show(struct mddev *mddev, char *page) |
08a02ecd N |
4930 | { |
4931 | if (mddev->reshape_position != MaxSector) | |
4932 | return sprintf(page, "%llu\n", | |
4933 | (unsigned long long)mddev->reshape_position); | |
4934 | strcpy(page, "none\n"); | |
4935 | return 5; | |
4936 | } | |
4937 | ||
4938 | static ssize_t | |
fd01b88c | 4939 | reshape_position_store(struct mddev *mddev, const char *buf, size_t len) |
08a02ecd | 4940 | { |
c6563a8c | 4941 | struct md_rdev *rdev; |
4c9309c0 | 4942 | unsigned long long new; |
6791875e | 4943 | int err; |
6791875e | 4944 | |
4c9309c0 AD |
4945 | err = kstrtoull(buf, 10, &new); |
4946 | if (err < 0) | |
4947 | return err; | |
4948 | if (new != (sector_t)new) | |
08a02ecd | 4949 | return -EINVAL; |
6791875e N |
4950 | err = mddev_lock(mddev); |
4951 | if (err) | |
4952 | return err; | |
4953 | err = -EBUSY; | |
4954 | if (mddev->pers) | |
4955 | goto unlock; | |
08a02ecd N |
4956 | mddev->reshape_position = new; |
4957 | mddev->delta_disks = 0; | |
2c810cdd | 4958 | mddev->reshape_backwards = 0; |
08a02ecd N |
4959 | mddev->new_level = mddev->level; |
4960 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4961 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
c6563a8c N |
4962 | rdev_for_each(rdev, mddev) |
4963 | rdev->new_data_offset = rdev->data_offset; | |
6791875e N |
4964 | err = 0; |
4965 | unlock: | |
4966 | mddev_unlock(mddev); | |
4967 | return err ?: len; | |
08a02ecd N |
4968 | } |
4969 | ||
4970 | static struct md_sysfs_entry md_reshape_position = | |
4971 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4972 | reshape_position_store); | |
4973 | ||
2c810cdd N |
4974 | static ssize_t |
4975 | reshape_direction_show(struct mddev *mddev, char *page) | |
4976 | { | |
4977 | return sprintf(page, "%s\n", | |
4978 | mddev->reshape_backwards ? "backwards" : "forwards"); | |
4979 | } | |
4980 | ||
4981 | static ssize_t | |
4982 | reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) | |
4983 | { | |
4984 | int backwards = 0; | |
6791875e N |
4985 | int err; |
4986 | ||
2c810cdd N |
4987 | if (cmd_match(buf, "forwards")) |
4988 | backwards = 0; | |
4989 | else if (cmd_match(buf, "backwards")) | |
4990 | backwards = 1; | |
4991 | else | |
4992 | return -EINVAL; | |
4993 | if (mddev->reshape_backwards == backwards) | |
4994 | return len; | |
4995 | ||
6791875e N |
4996 | err = mddev_lock(mddev); |
4997 | if (err) | |
4998 | return err; | |
2c810cdd N |
4999 | /* check if we are allowed to change */ |
5000 | if (mddev->delta_disks) | |
6791875e N |
5001 | err = -EBUSY; |
5002 | else if (mddev->persistent && | |
2c810cdd | 5003 | mddev->major_version == 0) |
6791875e N |
5004 | err = -EINVAL; |
5005 | else | |
5006 | mddev->reshape_backwards = backwards; | |
5007 | mddev_unlock(mddev); | |
5008 | return err ?: len; | |
2c810cdd N |
5009 | } |
5010 | ||
5011 | static struct md_sysfs_entry md_reshape_direction = | |
5012 | __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, | |
5013 | reshape_direction_store); | |
5014 | ||
b522adcd | 5015 | static ssize_t |
fd01b88c | 5016 | array_size_show(struct mddev *mddev, char *page) |
b522adcd DW |
5017 | { |
5018 | if (mddev->external_size) | |
5019 | return sprintf(page, "%llu\n", | |
5020 | (unsigned long long)mddev->array_sectors/2); | |
5021 | else | |
5022 | return sprintf(page, "default\n"); | |
5023 | } | |
5024 | ||
5025 | static ssize_t | |
fd01b88c | 5026 | array_size_store(struct mddev *mddev, const char *buf, size_t len) |
b522adcd DW |
5027 | { |
5028 | sector_t sectors; | |
6791875e N |
5029 | int err; |
5030 | ||
5031 | err = mddev_lock(mddev); | |
5032 | if (err) | |
5033 | return err; | |
b522adcd | 5034 | |
ab5a98b1 | 5035 | /* cluster raid doesn't support change array_sectors */ |
b670883b ZL |
5036 | if (mddev_is_clustered(mddev)) { |
5037 | mddev_unlock(mddev); | |
ab5a98b1 | 5038 | return -EINVAL; |
b670883b | 5039 | } |
ab5a98b1 | 5040 | |
b522adcd DW |
5041 | if (strncmp(buf, "default", 7) == 0) { |
5042 | if (mddev->pers) | |
5043 | sectors = mddev->pers->size(mddev, 0, 0); | |
5044 | else | |
5045 | sectors = mddev->array_sectors; | |
5046 | ||
5047 | mddev->external_size = 0; | |
5048 | } else { | |
5049 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
6791875e N |
5050 | err = -EINVAL; |
5051 | else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
5052 | err = -E2BIG; | |
5053 | else | |
5054 | mddev->external_size = 1; | |
b522adcd DW |
5055 | } |
5056 | ||
6791875e N |
5057 | if (!err) { |
5058 | mddev->array_sectors = sectors; | |
5059 | if (mddev->pers) { | |
5060 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
5061 | revalidate_disk(mddev->gendisk); | |
5062 | } | |
cbe6ef1d | 5063 | } |
6791875e N |
5064 | mddev_unlock(mddev); |
5065 | return err ?: len; | |
b522adcd DW |
5066 | } |
5067 | ||
5068 | static struct md_sysfs_entry md_array_size = | |
5069 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
5070 | array_size_store); | |
e464eafd | 5071 | |
664aed04 AP |
5072 | static ssize_t |
5073 | consistency_policy_show(struct mddev *mddev, char *page) | |
5074 | { | |
5075 | int ret; | |
5076 | ||
5077 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { | |
5078 | ret = sprintf(page, "journal\n"); | |
5079 | } else if (test_bit(MD_HAS_PPL, &mddev->flags)) { | |
5080 | ret = sprintf(page, "ppl\n"); | |
5081 | } else if (mddev->bitmap) { | |
5082 | ret = sprintf(page, "bitmap\n"); | |
5083 | } else if (mddev->pers) { | |
5084 | if (mddev->pers->sync_request) | |
5085 | ret = sprintf(page, "resync\n"); | |
5086 | else | |
5087 | ret = sprintf(page, "none\n"); | |
5088 | } else { | |
5089 | ret = sprintf(page, "unknown\n"); | |
5090 | } | |
5091 | ||
5092 | return ret; | |
5093 | } | |
5094 | ||
5095 | static ssize_t | |
5096 | consistency_policy_store(struct mddev *mddev, const char *buf, size_t len) | |
5097 | { | |
ba903a3e AP |
5098 | int err = 0; |
5099 | ||
664aed04 | 5100 | if (mddev->pers) { |
ba903a3e AP |
5101 | if (mddev->pers->change_consistency_policy) |
5102 | err = mddev->pers->change_consistency_policy(mddev, buf); | |
5103 | else | |
5104 | err = -EBUSY; | |
664aed04 AP |
5105 | } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) { |
5106 | set_bit(MD_HAS_PPL, &mddev->flags); | |
664aed04 | 5107 | } else { |
ba903a3e | 5108 | err = -EINVAL; |
664aed04 | 5109 | } |
ba903a3e AP |
5110 | |
5111 | return err ? err : len; | |
664aed04 AP |
5112 | } |
5113 | ||
5114 | static struct md_sysfs_entry md_consistency_policy = | |
5115 | __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show, | |
5116 | consistency_policy_store); | |
5117 | ||
eae1701f N |
5118 | static struct attribute *md_default_attrs[] = { |
5119 | &md_level.attr, | |
d4dbd025 | 5120 | &md_layout.attr, |
eae1701f | 5121 | &md_raid_disks.attr, |
3b34380a | 5122 | &md_chunk_size.attr, |
a35b0d69 | 5123 | &md_size.attr, |
a94213b1 | 5124 | &md_resync_start.attr, |
8bb93aac | 5125 | &md_metadata.attr, |
6d7ff738 | 5126 | &md_new_device.attr, |
16f17b39 | 5127 | &md_safe_delay.attr, |
9e653b63 | 5128 | &md_array_state.attr, |
08a02ecd | 5129 | &md_reshape_position.attr, |
2c810cdd | 5130 | &md_reshape_direction.attr, |
b522adcd | 5131 | &md_array_size.attr, |
1e50915f | 5132 | &max_corr_read_errors.attr, |
664aed04 | 5133 | &md_consistency_policy.attr, |
411036fa N |
5134 | NULL, |
5135 | }; | |
5136 | ||
5137 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 5138 | &md_scan_mode.attr, |
c4a39551 | 5139 | &md_last_scan_mode.attr, |
9d88883e | 5140 | &md_mismatches.attr, |
88202a0c N |
5141 | &md_sync_min.attr, |
5142 | &md_sync_max.attr, | |
5143 | &md_sync_speed.attr, | |
90b08710 | 5144 | &md_sync_force_parallel.attr, |
88202a0c | 5145 | &md_sync_completed.attr, |
5e96ee65 | 5146 | &md_min_sync.attr, |
c6207277 | 5147 | &md_max_sync.attr, |
e464eafd N |
5148 | &md_suspend_lo.attr, |
5149 | &md_suspend_hi.attr, | |
9b1d1dac | 5150 | &md_bitmap.attr, |
d7f3d291 | 5151 | &md_degraded.attr, |
eae1701f N |
5152 | NULL, |
5153 | }; | |
411036fa N |
5154 | static struct attribute_group md_redundancy_group = { |
5155 | .name = NULL, | |
5156 | .attrs = md_redundancy_attrs, | |
5157 | }; | |
5158 | ||
eae1701f N |
5159 | static ssize_t |
5160 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
5161 | { | |
5162 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 5163 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 5164 | ssize_t rv; |
eae1701f N |
5165 | |
5166 | if (!entry->show) | |
5167 | return -EIO; | |
af8a2434 N |
5168 | spin_lock(&all_mddevs_lock); |
5169 | if (list_empty(&mddev->all_mddevs)) { | |
5170 | spin_unlock(&all_mddevs_lock); | |
5171 | return -EBUSY; | |
5172 | } | |
5173 | mddev_get(mddev); | |
5174 | spin_unlock(&all_mddevs_lock); | |
5175 | ||
b7b17c9b | 5176 | rv = entry->show(mddev, page); |
af8a2434 | 5177 | mddev_put(mddev); |
96de1e66 | 5178 | return rv; |
eae1701f N |
5179 | } |
5180 | ||
5181 | static ssize_t | |
5182 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
5183 | const char *page, size_t length) | |
5184 | { | |
5185 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 5186 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 5187 | ssize_t rv; |
eae1701f N |
5188 | |
5189 | if (!entry->store) | |
5190 | return -EIO; | |
67463acb N |
5191 | if (!capable(CAP_SYS_ADMIN)) |
5192 | return -EACCES; | |
af8a2434 N |
5193 | spin_lock(&all_mddevs_lock); |
5194 | if (list_empty(&mddev->all_mddevs)) { | |
5195 | spin_unlock(&all_mddevs_lock); | |
5196 | return -EBUSY; | |
5197 | } | |
5198 | mddev_get(mddev); | |
5199 | spin_unlock(&all_mddevs_lock); | |
6791875e | 5200 | rv = entry->store(mddev, page, length); |
af8a2434 | 5201 | mddev_put(mddev); |
96de1e66 | 5202 | return rv; |
eae1701f N |
5203 | } |
5204 | ||
5205 | static void md_free(struct kobject *ko) | |
5206 | { | |
fd01b88c | 5207 | struct mddev *mddev = container_of(ko, struct mddev, kobj); |
a21d1504 N |
5208 | |
5209 | if (mddev->sysfs_state) | |
5210 | sysfs_put(mddev->sysfs_state); | |
5211 | ||
6cd18e71 N |
5212 | if (mddev->queue) |
5213 | blk_cleanup_queue(mddev->queue); | |
a21d1504 N |
5214 | if (mddev->gendisk) { |
5215 | del_gendisk(mddev->gendisk); | |
5216 | put_disk(mddev->gendisk); | |
5217 | } | |
4ad23a97 | 5218 | percpu_ref_exit(&mddev->writes_pending); |
a21d1504 | 5219 | |
eae1701f N |
5220 | kfree(mddev); |
5221 | } | |
5222 | ||
52cf25d0 | 5223 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
5224 | .show = md_attr_show, |
5225 | .store = md_attr_store, | |
5226 | }; | |
5227 | static struct kobj_type md_ktype = { | |
5228 | .release = md_free, | |
5229 | .sysfs_ops = &md_sysfs_ops, | |
5230 | .default_attrs = md_default_attrs, | |
5231 | }; | |
5232 | ||
1da177e4 LT |
5233 | int mdp_major = 0; |
5234 | ||
5fd3a17e DW |
5235 | static void mddev_delayed_delete(struct work_struct *ws) |
5236 | { | |
fd01b88c | 5237 | struct mddev *mddev = container_of(ws, struct mddev, del_work); |
5fd3a17e | 5238 | |
43a70507 | 5239 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
5240 | kobject_del(&mddev->kobj); |
5241 | kobject_put(&mddev->kobj); | |
5242 | } | |
5243 | ||
4ad23a97 N |
5244 | static void no_op(struct percpu_ref *r) {} |
5245 | ||
a415c0f1 N |
5246 | int mddev_init_writes_pending(struct mddev *mddev) |
5247 | { | |
5248 | if (mddev->writes_pending.percpu_count_ptr) | |
5249 | return 0; | |
5250 | if (percpu_ref_init(&mddev->writes_pending, no_op, 0, GFP_KERNEL) < 0) | |
5251 | return -ENOMEM; | |
5252 | /* We want to start with the refcount at zero */ | |
5253 | percpu_ref_put(&mddev->writes_pending); | |
5254 | return 0; | |
5255 | } | |
5256 | EXPORT_SYMBOL_GPL(mddev_init_writes_pending); | |
5257 | ||
efeb53c0 | 5258 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 5259 | { |
039b7225 N |
5260 | /* |
5261 | * If dev is zero, name is the name of a device to allocate with | |
5262 | * an arbitrary minor number. It will be "md_???" | |
5263 | * If dev is non-zero it must be a device number with a MAJOR of | |
5264 | * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then | |
5265 | * the device is being created by opening a node in /dev. | |
5266 | * If "name" is not NULL, the device is being created by | |
5267 | * writing to /sys/module/md_mod/parameters/new_array. | |
5268 | */ | |
48c9c27b | 5269 | static DEFINE_MUTEX(disks_mutex); |
fd01b88c | 5270 | struct mddev *mddev = mddev_find(dev); |
1da177e4 | 5271 | struct gendisk *disk; |
efeb53c0 N |
5272 | int partitioned; |
5273 | int shift; | |
5274 | int unit; | |
3830c62f | 5275 | int error; |
1da177e4 LT |
5276 | |
5277 | if (!mddev) | |
efeb53c0 N |
5278 | return -ENODEV; |
5279 | ||
5280 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
5281 | shift = partitioned ? MdpMinorShift : 0; | |
5282 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 5283 | |
e804ac78 TH |
5284 | /* wait for any previous instance of this device to be |
5285 | * completely removed (mddev_delayed_delete). | |
d3374825 | 5286 | */ |
e804ac78 | 5287 | flush_workqueue(md_misc_wq); |
d3374825 | 5288 | |
48c9c27b | 5289 | mutex_lock(&disks_mutex); |
0909dc44 N |
5290 | error = -EEXIST; |
5291 | if (mddev->gendisk) | |
5292 | goto abort; | |
efeb53c0 | 5293 | |
039b7225 | 5294 | if (name && !dev) { |
efeb53c0 N |
5295 | /* Need to ensure that 'name' is not a duplicate. |
5296 | */ | |
fd01b88c | 5297 | struct mddev *mddev2; |
efeb53c0 N |
5298 | spin_lock(&all_mddevs_lock); |
5299 | ||
5300 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
5301 | if (mddev2->gendisk && | |
5302 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
5303 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 5304 | goto abort; |
efeb53c0 N |
5305 | } |
5306 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 5307 | } |
039b7225 N |
5308 | if (name && dev) |
5309 | /* | |
5310 | * Creating /dev/mdNNN via "newarray", so adjust hold_active. | |
5311 | */ | |
5312 | mddev->hold_active = UNTIL_STOP; | |
8b765398 | 5313 | |
0909dc44 | 5314 | error = -ENOMEM; |
8b765398 | 5315 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
5316 | if (!mddev->queue) |
5317 | goto abort; | |
409c57f3 N |
5318 | mddev->queue->queuedata = mddev; |
5319 | ||
409c57f3 | 5320 | blk_queue_make_request(mddev->queue, md_make_request); |
b1bd055d | 5321 | blk_set_stacking_limits(&mddev->queue->limits); |
8b765398 | 5322 | |
1da177e4 LT |
5323 | disk = alloc_disk(1 << shift); |
5324 | if (!disk) { | |
8b765398 N |
5325 | blk_cleanup_queue(mddev->queue); |
5326 | mddev->queue = NULL; | |
0909dc44 | 5327 | goto abort; |
1da177e4 | 5328 | } |
efeb53c0 | 5329 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 5330 | disk->first_minor = unit << shift; |
efeb53c0 N |
5331 | if (name) |
5332 | strcpy(disk->disk_name, name); | |
5333 | else if (partitioned) | |
1da177e4 | 5334 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 5335 | else |
1da177e4 | 5336 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
5337 | disk->fops = &md_fops; |
5338 | disk->private_data = mddev; | |
5339 | disk->queue = mddev->queue; | |
56883a7e | 5340 | blk_queue_write_cache(mddev->queue, true, true); |
92850bbd | 5341 | /* Allow extended partitions. This makes the |
d3374825 | 5342 | * 'mdp' device redundant, but we can't really |
92850bbd N |
5343 | * remove it now. |
5344 | */ | |
5345 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 | 5346 | mddev->gendisk = disk; |
b0140891 N |
5347 | /* As soon as we call add_disk(), another thread could get |
5348 | * through to md_open, so make sure it doesn't get too far | |
5349 | */ | |
5350 | mutex_lock(&mddev->open_mutex); | |
5351 | add_disk(disk); | |
5352 | ||
ed9e1982 TH |
5353 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
5354 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
5355 | if (error) { |
5356 | /* This isn't possible, but as kobject_init_and_add is marked | |
5357 | * __must_check, we must do something with the result | |
5358 | */ | |
9d48739e N |
5359 | pr_debug("md: cannot register %s/md - name in use\n", |
5360 | disk->disk_name); | |
0909dc44 N |
5361 | error = 0; |
5362 | } | |
00bcb4ac N |
5363 | if (mddev->kobj.sd && |
5364 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
9d48739e | 5365 | pr_debug("pointless warning\n"); |
b0140891 | 5366 | mutex_unlock(&mddev->open_mutex); |
0909dc44 N |
5367 | abort: |
5368 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 5369 | if (!error && mddev->kobj.sd) { |
3830c62f | 5370 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 5371 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 5372 | } |
d3374825 | 5373 | mddev_put(mddev); |
0909dc44 | 5374 | return error; |
efeb53c0 N |
5375 | } |
5376 | ||
5377 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
5378 | { | |
78b6350d N |
5379 | if (create_on_open) |
5380 | md_alloc(dev, NULL); | |
1da177e4 LT |
5381 | return NULL; |
5382 | } | |
5383 | ||
efeb53c0 N |
5384 | static int add_named_array(const char *val, struct kernel_param *kp) |
5385 | { | |
039b7225 N |
5386 | /* |
5387 | * val must be "md_*" or "mdNNN". | |
5388 | * For "md_*" we allocate an array with a large free minor number, and | |
efeb53c0 | 5389 | * set the name to val. val must not already be an active name. |
039b7225 N |
5390 | * For "mdNNN" we allocate an array with the minor number NNN |
5391 | * which must not already be in use. | |
efeb53c0 N |
5392 | */ |
5393 | int len = strlen(val); | |
5394 | char buf[DISK_NAME_LEN]; | |
039b7225 | 5395 | unsigned long devnum; |
efeb53c0 N |
5396 | |
5397 | while (len && val[len-1] == '\n') | |
5398 | len--; | |
5399 | if (len >= DISK_NAME_LEN) | |
5400 | return -E2BIG; | |
5401 | strlcpy(buf, val, len+1); | |
039b7225 N |
5402 | if (strncmp(buf, "md_", 3) == 0) |
5403 | return md_alloc(0, buf); | |
5404 | if (strncmp(buf, "md", 2) == 0 && | |
5405 | isdigit(buf[2]) && | |
5406 | kstrtoul(buf+2, 10, &devnum) == 0 && | |
5407 | devnum <= MINORMASK) | |
5408 | return md_alloc(MKDEV(MD_MAJOR, devnum), NULL); | |
5409 | ||
5410 | return -EINVAL; | |
efeb53c0 N |
5411 | } |
5412 | ||
1da177e4 LT |
5413 | static void md_safemode_timeout(unsigned long data) |
5414 | { | |
fd01b88c | 5415 | struct mddev *mddev = (struct mddev *) data; |
1da177e4 | 5416 | |
4ad23a97 N |
5417 | mddev->safemode = 1; |
5418 | if (mddev->external) | |
5419 | sysfs_notify_dirent_safe(mddev->sysfs_state); | |
5420 | ||
1da177e4 LT |
5421 | md_wakeup_thread(mddev->thread); |
5422 | } | |
5423 | ||
6ff8d8ec | 5424 | static int start_dirty_degraded; |
1da177e4 | 5425 | |
fd01b88c | 5426 | int md_run(struct mddev *mddev) |
1da177e4 | 5427 | { |
2604b703 | 5428 | int err; |
3cb03002 | 5429 | struct md_rdev *rdev; |
84fc4b56 | 5430 | struct md_personality *pers; |
1da177e4 | 5431 | |
a757e64c N |
5432 | if (list_empty(&mddev->disks)) |
5433 | /* cannot run an array with no devices.. */ | |
1da177e4 | 5434 | return -EINVAL; |
1da177e4 LT |
5435 | |
5436 | if (mddev->pers) | |
5437 | return -EBUSY; | |
bb4f1e9d N |
5438 | /* Cannot run until previous stop completes properly */ |
5439 | if (mddev->sysfs_active) | |
5440 | return -EBUSY; | |
b6eb127d | 5441 | |
1da177e4 LT |
5442 | /* |
5443 | * Analyze all RAID superblock(s) | |
5444 | */ | |
1ec4a939 N |
5445 | if (!mddev->raid_disks) { |
5446 | if (!mddev->persistent) | |
5447 | return -EINVAL; | |
a757e64c | 5448 | analyze_sbs(mddev); |
1ec4a939 | 5449 | } |
1da177e4 | 5450 | |
d9d166c2 N |
5451 | if (mddev->level != LEVEL_NONE) |
5452 | request_module("md-level-%d", mddev->level); | |
5453 | else if (mddev->clevel[0]) | |
5454 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
5455 | |
5456 | /* | |
5457 | * Drop all container device buffers, from now on | |
5458 | * the only valid external interface is through the md | |
5459 | * device. | |
1da177e4 | 5460 | */ |
dafb20fa | 5461 | rdev_for_each(rdev, mddev) { |
b2d444d7 | 5462 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5463 | continue; |
5464 | sync_blockdev(rdev->bdev); | |
f98393a6 | 5465 | invalidate_bdev(rdev->bdev); |
97b20ef7 N |
5466 | if (mddev->ro != 1 && |
5467 | (bdev_read_only(rdev->bdev) || | |
5468 | bdev_read_only(rdev->meta_bdev))) { | |
5469 | mddev->ro = 1; | |
5470 | if (mddev->gendisk) | |
5471 | set_disk_ro(mddev->gendisk, 1); | |
5472 | } | |
f0d76d70 N |
5473 | |
5474 | /* perform some consistency tests on the device. | |
5475 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 5476 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 5477 | */ |
a6ff7e08 JB |
5478 | if (rdev->meta_bdev) { |
5479 | /* Nothing to check */; | |
5480 | } else if (rdev->data_offset < rdev->sb_start) { | |
58c0fed4 AN |
5481 | if (mddev->dev_sectors && |
5482 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 5483 | > rdev->sb_start) { |
9d48739e N |
5484 | pr_warn("md: %s: data overlaps metadata\n", |
5485 | mdname(mddev)); | |
f0d76d70 N |
5486 | return -EINVAL; |
5487 | } | |
5488 | } else { | |
0f420358 | 5489 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 | 5490 | > rdev->data_offset) { |
9d48739e N |
5491 | pr_warn("md: %s: metadata overlaps data\n", |
5492 | mdname(mddev)); | |
f0d76d70 N |
5493 | return -EINVAL; |
5494 | } | |
5495 | } | |
00bcb4ac | 5496 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
5497 | } |
5498 | ||
10273170 | 5499 | if (mddev->bio_set == NULL) { |
011067b0 | 5500 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); |
10273170 ML |
5501 | if (!mddev->bio_set) |
5502 | return -ENOMEM; | |
5503 | } | |
5a85071c | 5504 | if (mddev->sync_set == NULL) { |
026d15f6 | 5505 | mddev->sync_set = bioset_create(BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); |
5a85071c N |
5506 | if (!mddev->sync_set) |
5507 | return -ENOMEM; | |
5508 | } | |
a167f663 | 5509 | |
1da177e4 | 5510 | spin_lock(&pers_lock); |
d9d166c2 | 5511 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 5512 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 5513 | spin_unlock(&pers_lock); |
d9d166c2 | 5514 | if (mddev->level != LEVEL_NONE) |
9d48739e N |
5515 | pr_warn("md: personality for level %d is not loaded!\n", |
5516 | mddev->level); | |
d9d166c2 | 5517 | else |
9d48739e N |
5518 | pr_warn("md: personality for level %s is not loaded!\n", |
5519 | mddev->clevel); | |
1da177e4 LT |
5520 | return -EINVAL; |
5521 | } | |
1da177e4 | 5522 | spin_unlock(&pers_lock); |
34817e8c N |
5523 | if (mddev->level != pers->level) { |
5524 | mddev->level = pers->level; | |
5525 | mddev->new_level = pers->level; | |
5526 | } | |
d9d166c2 | 5527 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 5528 | |
f6705578 | 5529 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 5530 | pers->start_reshape == NULL) { |
f6705578 | 5531 | /* This personality cannot handle reshaping... */ |
f6705578 N |
5532 | module_put(pers->owner); |
5533 | return -EINVAL; | |
5534 | } | |
5535 | ||
7dd5e7c3 N |
5536 | if (pers->sync_request) { |
5537 | /* Warn if this is a potentially silly | |
5538 | * configuration. | |
5539 | */ | |
5540 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5541 | struct md_rdev *rdev2; |
7dd5e7c3 | 5542 | int warned = 0; |
159ec1fc | 5543 | |
dafb20fa N |
5544 | rdev_for_each(rdev, mddev) |
5545 | rdev_for_each(rdev2, mddev) { | |
7dd5e7c3 N |
5546 | if (rdev < rdev2 && |
5547 | rdev->bdev->bd_contains == | |
5548 | rdev2->bdev->bd_contains) { | |
9d48739e N |
5549 | pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n", |
5550 | mdname(mddev), | |
5551 | bdevname(rdev->bdev,b), | |
5552 | bdevname(rdev2->bdev,b2)); | |
7dd5e7c3 N |
5553 | warned = 1; |
5554 | } | |
5555 | } | |
159ec1fc | 5556 | |
7dd5e7c3 | 5557 | if (warned) |
9d48739e | 5558 | pr_warn("True protection against single-disk failure might be compromised.\n"); |
7dd5e7c3 N |
5559 | } |
5560 | ||
657390d2 | 5561 | mddev->recovery = 0; |
58c0fed4 AN |
5562 | /* may be over-ridden by personality */ |
5563 | mddev->resync_max_sectors = mddev->dev_sectors; | |
5564 | ||
6ff8d8ec | 5565 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 5566 | |
0f9552b5 | 5567 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
5568 | mddev->ro = 2; /* read-only, but switch on first write */ |
5569 | ||
a85dd7b8 SL |
5570 | /* |
5571 | * NOTE: some pers->run(), for example r5l_recovery_log(), wakes | |
5572 | * up mddev->thread. It is important to initialize critical | |
5573 | * resources for mddev->thread BEFORE calling pers->run(). | |
5574 | */ | |
36d091f4 | 5575 | err = pers->run(mddev); |
13e53df3 | 5576 | if (err) |
9d48739e | 5577 | pr_warn("md: pers->run() failed ...\n"); |
36d091f4 | 5578 | else if (pers->size(mddev, 0, 0) < mddev->array_sectors) { |
9d48739e N |
5579 | WARN_ONCE(!mddev->external_size, |
5580 | "%s: default size too small, but 'external_size' not in effect?\n", | |
5581 | __func__); | |
5582 | pr_warn("md: invalid array_size %llu > default size %llu\n", | |
5583 | (unsigned long long)mddev->array_sectors / 2, | |
5584 | (unsigned long long)pers->size(mddev, 0, 0) / 2); | |
b522adcd | 5585 | err = -EINVAL; |
b522adcd | 5586 | } |
36d091f4 | 5587 | if (err == 0 && pers->sync_request && |
ef99bf48 | 5588 | (mddev->bitmap_info.file || mddev->bitmap_info.offset)) { |
f9209a32 GR |
5589 | struct bitmap *bitmap; |
5590 | ||
5591 | bitmap = bitmap_create(mddev, -1); | |
5592 | if (IS_ERR(bitmap)) { | |
5593 | err = PTR_ERR(bitmap); | |
9d48739e N |
5594 | pr_warn("%s: failed to create bitmap (%d)\n", |
5595 | mdname(mddev), err); | |
f9209a32 GR |
5596 | } else |
5597 | mddev->bitmap = bitmap; | |
5598 | ||
b15c2e57 | 5599 | } |
1da177e4 | 5600 | if (err) { |
5aa61f42 | 5601 | mddev_detach(mddev); |
0c35bd47 N |
5602 | if (mddev->private) |
5603 | pers->free(mddev, mddev->private); | |
bd691922 | 5604 | mddev->private = NULL; |
36d091f4 | 5605 | module_put(pers->owner); |
32a7627c N |
5606 | bitmap_destroy(mddev); |
5607 | return err; | |
1da177e4 | 5608 | } |
5c675f83 | 5609 | if (mddev->queue) { |
bb086a89 SL |
5610 | bool nonrot = true; |
5611 | ||
5612 | rdev_for_each(rdev, mddev) { | |
5613 | if (rdev->raid_disk >= 0 && | |
5614 | !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) { | |
5615 | nonrot = false; | |
5616 | break; | |
5617 | } | |
5618 | } | |
5619 | if (mddev->degraded) | |
5620 | nonrot = false; | |
5621 | if (nonrot) | |
5622 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mddev->queue); | |
5623 | else | |
5624 | queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, mddev->queue); | |
dc3b17cc JK |
5625 | mddev->queue->backing_dev_info->congested_data = mddev; |
5626 | mddev->queue->backing_dev_info->congested_fn = md_congested; | |
5c675f83 | 5627 | } |
36d091f4 | 5628 | if (pers->sync_request) { |
00bcb4ac N |
5629 | if (mddev->kobj.sd && |
5630 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
9d48739e N |
5631 | pr_warn("md: cannot register extra attributes for %s\n", |
5632 | mdname(mddev)); | |
00bcb4ac | 5633 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 5634 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
5635 | mddev->ro = 0; |
5636 | ||
1e50915f RB |
5637 | atomic_set(&mddev->max_corr_read_errors, |
5638 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 | 5639 | mddev->safemode = 0; |
28c1b9fd GR |
5640 | if (mddev_is_clustered(mddev)) |
5641 | mddev->safemode_delay = 0; | |
5642 | else | |
5643 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ | |
1da177e4 | 5644 | mddev->in_sync = 1; |
0ca69886 | 5645 | smp_wmb(); |
36d091f4 N |
5646 | spin_lock(&mddev->lock); |
5647 | mddev->pers = pers; | |
36d091f4 | 5648 | spin_unlock(&mddev->lock); |
dafb20fa | 5649 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5650 | if (rdev->raid_disk >= 0) |
5651 | if (sysfs_link_rdev(mddev, rdev)) | |
00bcb4ac | 5652 | /* failure here is OK */; |
f72ffdd6 | 5653 | |
a4a3d26d N |
5654 | if (mddev->degraded && !mddev->ro) |
5655 | /* This ensures that recovering status is reported immediately | |
5656 | * via sysfs - until a lack of spares is confirmed. | |
5657 | */ | |
5658 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
1da177e4 | 5659 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f72ffdd6 | 5660 | |
2953079c | 5661 | if (mddev->sb_flags) |
850b2b42 | 5662 | md_update_sb(mddev, 0); |
1da177e4 | 5663 | |
d7603b7e | 5664 | md_new_event(mddev); |
00bcb4ac N |
5665 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
5666 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 5667 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
5668 | return 0; |
5669 | } | |
390ee602 | 5670 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 5671 | |
fd01b88c | 5672 | static int do_md_run(struct mddev *mddev) |
fe60b014 N |
5673 | { |
5674 | int err; | |
5675 | ||
5676 | err = md_run(mddev); | |
5677 | if (err) | |
5678 | goto out; | |
69e51b44 N |
5679 | err = bitmap_load(mddev); |
5680 | if (err) { | |
5681 | bitmap_destroy(mddev); | |
5682 | goto out; | |
5683 | } | |
0fd018af | 5684 | |
28c1b9fd GR |
5685 | if (mddev_is_clustered(mddev)) |
5686 | md_allow_write(mddev); | |
5687 | ||
0fd018af JB |
5688 | md_wakeup_thread(mddev->thread); |
5689 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5690 | ||
fe60b014 N |
5691 | set_capacity(mddev->gendisk, mddev->array_sectors); |
5692 | revalidate_disk(mddev->gendisk); | |
f0b4f7e2 | 5693 | mddev->changed = 1; |
fe60b014 N |
5694 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
5695 | out: | |
5696 | return err; | |
5697 | } | |
5698 | ||
fd01b88c | 5699 | static int restart_array(struct mddev *mddev) |
1da177e4 LT |
5700 | { |
5701 | struct gendisk *disk = mddev->gendisk; | |
97b20ef7 N |
5702 | struct md_rdev *rdev; |
5703 | bool has_journal = false; | |
5704 | bool has_readonly = false; | |
1da177e4 | 5705 | |
80fab1d7 | 5706 | /* Complain if it has no devices */ |
1da177e4 | 5707 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
5708 | return -ENXIO; |
5709 | if (!mddev->pers) | |
5710 | return -EINVAL; | |
5711 | if (!mddev->ro) | |
5712 | return -EBUSY; | |
339421de | 5713 | |
97b20ef7 N |
5714 | rcu_read_lock(); |
5715 | rdev_for_each_rcu(rdev, mddev) { | |
5716 | if (test_bit(Journal, &rdev->flags) && | |
5717 | !test_bit(Faulty, &rdev->flags)) | |
5718 | has_journal = true; | |
5719 | if (bdev_read_only(rdev->bdev)) | |
5720 | has_readonly = true; | |
5721 | } | |
5722 | rcu_read_unlock(); | |
5723 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal) | |
339421de | 5724 | /* Don't restart rw with journal missing/faulty */ |
339421de | 5725 | return -EINVAL; |
97b20ef7 N |
5726 | if (has_readonly) |
5727 | return -EROFS; | |
339421de | 5728 | |
80fab1d7 AN |
5729 | mddev->safemode = 0; |
5730 | mddev->ro = 0; | |
5731 | set_disk_ro(disk, 0); | |
9d48739e | 5732 | pr_debug("md: %s switched to read-write mode.\n", mdname(mddev)); |
80fab1d7 AN |
5733 | /* Kick recovery or resync if necessary */ |
5734 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5735 | md_wakeup_thread(mddev->thread); | |
5736 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 5737 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 5738 | return 0; |
1da177e4 LT |
5739 | } |
5740 | ||
fd01b88c | 5741 | static void md_clean(struct mddev *mddev) |
6177b472 N |
5742 | { |
5743 | mddev->array_sectors = 0; | |
5744 | mddev->external_size = 0; | |
5745 | mddev->dev_sectors = 0; | |
5746 | mddev->raid_disks = 0; | |
5747 | mddev->recovery_cp = 0; | |
5748 | mddev->resync_min = 0; | |
5749 | mddev->resync_max = MaxSector; | |
5750 | mddev->reshape_position = MaxSector; | |
5751 | mddev->external = 0; | |
5752 | mddev->persistent = 0; | |
5753 | mddev->level = LEVEL_NONE; | |
5754 | mddev->clevel[0] = 0; | |
5755 | mddev->flags = 0; | |
2953079c | 5756 | mddev->sb_flags = 0; |
6177b472 N |
5757 | mddev->ro = 0; |
5758 | mddev->metadata_type[0] = 0; | |
5759 | mddev->chunk_sectors = 0; | |
5760 | mddev->ctime = mddev->utime = 0; | |
5761 | mddev->layout = 0; | |
5762 | mddev->max_disks = 0; | |
5763 | mddev->events = 0; | |
a8707c08 | 5764 | mddev->can_decrease_events = 0; |
6177b472 | 5765 | mddev->delta_disks = 0; |
2c810cdd | 5766 | mddev->reshape_backwards = 0; |
6177b472 N |
5767 | mddev->new_level = LEVEL_NONE; |
5768 | mddev->new_layout = 0; | |
5769 | mddev->new_chunk_sectors = 0; | |
5770 | mddev->curr_resync = 0; | |
7f7583d4 | 5771 | atomic64_set(&mddev->resync_mismatches, 0); |
6177b472 N |
5772 | mddev->suspend_lo = mddev->suspend_hi = 0; |
5773 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
5774 | mddev->recovery = 0; | |
5775 | mddev->in_sync = 0; | |
f0b4f7e2 | 5776 | mddev->changed = 0; |
6177b472 | 5777 | mddev->degraded = 0; |
6177b472 | 5778 | mddev->safemode = 0; |
bd691922 | 5779 | mddev->private = NULL; |
c20c33f0 | 5780 | mddev->cluster_info = NULL; |
6177b472 N |
5781 | mddev->bitmap_info.offset = 0; |
5782 | mddev->bitmap_info.default_offset = 0; | |
6409bb05 | 5783 | mddev->bitmap_info.default_space = 0; |
6177b472 N |
5784 | mddev->bitmap_info.chunksize = 0; |
5785 | mddev->bitmap_info.daemon_sleep = 0; | |
5786 | mddev->bitmap_info.max_write_behind = 0; | |
c20c33f0 | 5787 | mddev->bitmap_info.nodes = 0; |
6177b472 N |
5788 | } |
5789 | ||
fd01b88c | 5790 | static void __md_stop_writes(struct mddev *mddev) |
a047e125 | 5791 | { |
6b6204ee | 5792 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
f851b60d | 5793 | flush_workqueue(md_misc_wq); |
a047e125 | 5794 | if (mddev->sync_thread) { |
a047e125 | 5795 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
a91d5ac0 | 5796 | md_reap_sync_thread(mddev); |
a047e125 N |
5797 | } |
5798 | ||
5799 | del_timer_sync(&mddev->safemode_timer); | |
5800 | ||
034e33f5 SL |
5801 | if (mddev->pers && mddev->pers->quiesce) { |
5802 | mddev->pers->quiesce(mddev, 1); | |
5803 | mddev->pers->quiesce(mddev, 0); | |
5804 | } | |
a047e125 | 5805 | bitmap_flush(mddev); |
a047e125 | 5806 | |
b6d428c6 | 5807 | if (mddev->ro == 0 && |
28c1b9fd | 5808 | ((!mddev->in_sync && !mddev_is_clustered(mddev)) || |
2953079c | 5809 | mddev->sb_flags)) { |
a047e125 | 5810 | /* mark array as shutdown cleanly */ |
28c1b9fd GR |
5811 | if (!mddev_is_clustered(mddev)) |
5812 | mddev->in_sync = 1; | |
a047e125 N |
5813 | md_update_sb(mddev, 1); |
5814 | } | |
5815 | } | |
defad61a | 5816 | |
fd01b88c | 5817 | void md_stop_writes(struct mddev *mddev) |
defad61a | 5818 | { |
29f097c4 | 5819 | mddev_lock_nointr(mddev); |
defad61a N |
5820 | __md_stop_writes(mddev); |
5821 | mddev_unlock(mddev); | |
5822 | } | |
390ee602 | 5823 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 5824 | |
5aa61f42 N |
5825 | static void mddev_detach(struct mddev *mddev) |
5826 | { | |
48df498d | 5827 | bitmap_wait_behind_writes(mddev); |
36d091f4 | 5828 | if (mddev->pers && mddev->pers->quiesce) { |
5aa61f42 N |
5829 | mddev->pers->quiesce(mddev, 1); |
5830 | mddev->pers->quiesce(mddev, 0); | |
5831 | } | |
5832 | md_unregister_thread(&mddev->thread); | |
5833 | if (mddev->queue) | |
5834 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ | |
5835 | } | |
5836 | ||
5eff3c43 | 5837 | static void __md_stop(struct mddev *mddev) |
6177b472 | 5838 | { |
36d091f4 | 5839 | struct md_personality *pers = mddev->pers; |
48df498d | 5840 | bitmap_destroy(mddev); |
5aa61f42 | 5841 | mddev_detach(mddev); |
ee5d004f N |
5842 | /* Ensure ->event_work is done */ |
5843 | flush_workqueue(md_misc_wq); | |
36d091f4 | 5844 | spin_lock(&mddev->lock); |
6177b472 | 5845 | mddev->pers = NULL; |
36d091f4 N |
5846 | spin_unlock(&mddev->lock); |
5847 | pers->free(mddev, mddev->private); | |
bd691922 | 5848 | mddev->private = NULL; |
36d091f4 N |
5849 | if (pers->sync_request && mddev->to_remove == NULL) |
5850 | mddev->to_remove = &md_redundancy_group; | |
5851 | module_put(pers->owner); | |
cca9cf90 | 5852 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 5853 | } |
5eff3c43 N |
5854 | |
5855 | void md_stop(struct mddev *mddev) | |
5856 | { | |
5857 | /* stop the array and free an attached data structures. | |
5858 | * This is called from dm-raid | |
5859 | */ | |
5860 | __md_stop(mddev); | |
5eff3c43 N |
5861 | if (mddev->bio_set) |
5862 | bioset_free(mddev->bio_set); | |
5863 | } | |
5864 | ||
390ee602 | 5865 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 5866 | |
a05b7ea0 | 5867 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) |
a4bd82d0 N |
5868 | { |
5869 | int err = 0; | |
30b8feb7 N |
5870 | int did_freeze = 0; |
5871 | ||
5872 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5873 | did_freeze = 1; | |
5874 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5875 | md_wakeup_thread(mddev->thread); | |
5876 | } | |
f851b60d | 5877 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5878 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5879 | if (mddev->sync_thread) |
30b8feb7 N |
5880 | /* Thread might be blocked waiting for metadata update |
5881 | * which will now never happen */ | |
5882 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5883 | |
2953079c | 5884 | if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) |
88724bfa | 5885 | return -EBUSY; |
30b8feb7 | 5886 | mddev_unlock(mddev); |
f851b60d N |
5887 | wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING, |
5888 | &mddev->recovery)); | |
88724bfa | 5889 | wait_event(mddev->sb_wait, |
2953079c | 5890 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); |
30b8feb7 N |
5891 | mddev_lock_nointr(mddev); |
5892 | ||
a4bd82d0 | 5893 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5894 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 | 5895 | mddev->sync_thread || |
af8d8e6f | 5896 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { |
9d48739e | 5897 | pr_warn("md: %s still in use.\n",mdname(mddev)); |
30b8feb7 N |
5898 | if (did_freeze) { |
5899 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5900 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5901 | md_wakeup_thread(mddev->thread); |
5902 | } | |
a4bd82d0 N |
5903 | err = -EBUSY; |
5904 | goto out; | |
5905 | } | |
5906 | if (mddev->pers) { | |
defad61a | 5907 | __md_stop_writes(mddev); |
a4bd82d0 N |
5908 | |
5909 | err = -ENXIO; | |
5910 | if (mddev->ro==1) | |
5911 | goto out; | |
5912 | mddev->ro = 1; | |
5913 | set_disk_ro(mddev->gendisk, 1); | |
5914 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d N |
5915 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5916 | md_wakeup_thread(mddev->thread); | |
00bcb4ac | 5917 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
30b8feb7 | 5918 | err = 0; |
a4bd82d0 N |
5919 | } |
5920 | out: | |
5921 | mutex_unlock(&mddev->open_mutex); | |
5922 | return err; | |
5923 | } | |
5924 | ||
9e653b63 N |
5925 | /* mode: |
5926 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
5927 | * 2 - stop but do not disassemble array |
5928 | */ | |
f72ffdd6 | 5929 | static int do_md_stop(struct mddev *mddev, int mode, |
a05b7ea0 | 5930 | struct block_device *bdev) |
1da177e4 | 5931 | { |
1da177e4 | 5932 | struct gendisk *disk = mddev->gendisk; |
3cb03002 | 5933 | struct md_rdev *rdev; |
30b8feb7 N |
5934 | int did_freeze = 0; |
5935 | ||
5936 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5937 | did_freeze = 1; | |
5938 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5939 | md_wakeup_thread(mddev->thread); | |
5940 | } | |
f851b60d | 5941 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5942 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5943 | if (mddev->sync_thread) |
30b8feb7 N |
5944 | /* Thread might be blocked waiting for metadata update |
5945 | * which will now never happen */ | |
5946 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5947 | |
30b8feb7 | 5948 | mddev_unlock(mddev); |
f851b60d N |
5949 | wait_event(resync_wait, (mddev->sync_thread == NULL && |
5950 | !test_bit(MD_RECOVERY_RUNNING, | |
5951 | &mddev->recovery))); | |
30b8feb7 | 5952 | mddev_lock_nointr(mddev); |
1da177e4 | 5953 | |
c8c00a69 | 5954 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5955 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 N |
5956 | mddev->sysfs_active || |
5957 | mddev->sync_thread || | |
af8d8e6f | 5958 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { |
9d48739e | 5959 | pr_warn("md: %s still in use.\n",mdname(mddev)); |
6e17b027 | 5960 | mutex_unlock(&mddev->open_mutex); |
30b8feb7 N |
5961 | if (did_freeze) { |
5962 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5963 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5964 | md_wakeup_thread(mddev->thread); |
5965 | } | |
260fa034 N |
5966 | return -EBUSY; |
5967 | } | |
6e17b027 | 5968 | if (mddev->pers) { |
a4bd82d0 N |
5969 | if (mddev->ro) |
5970 | set_disk_ro(disk, 0); | |
409c57f3 | 5971 | |
defad61a | 5972 | __md_stop_writes(mddev); |
5eff3c43 | 5973 | __md_stop(mddev); |
dc3b17cc | 5974 | mddev->queue->backing_dev_info->congested_fn = NULL; |
6177b472 | 5975 | |
a4bd82d0 | 5976 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 5977 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 5978 | |
dafb20fa | 5979 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5980 | if (rdev->raid_disk >= 0) |
5981 | sysfs_unlink_rdev(mddev, rdev); | |
c4647292 | 5982 | |
a4bd82d0 | 5983 | set_capacity(disk, 0); |
6e17b027 | 5984 | mutex_unlock(&mddev->open_mutex); |
f0b4f7e2 | 5985 | mddev->changed = 1; |
a4bd82d0 | 5986 | revalidate_disk(disk); |
0d4ca600 | 5987 | |
a4bd82d0 N |
5988 | if (mddev->ro) |
5989 | mddev->ro = 0; | |
6e17b027 N |
5990 | } else |
5991 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
5992 | /* |
5993 | * Free resources if final stop | |
5994 | */ | |
9e653b63 | 5995 | if (mode == 0) { |
9d48739e | 5996 | pr_info("md: %s stopped.\n", mdname(mddev)); |
1da177e4 | 5997 | |
c3d9714e | 5998 | if (mddev->bitmap_info.file) { |
4af1a041 N |
5999 | struct file *f = mddev->bitmap_info.file; |
6000 | spin_lock(&mddev->lock); | |
c3d9714e | 6001 | mddev->bitmap_info.file = NULL; |
4af1a041 N |
6002 | spin_unlock(&mddev->lock); |
6003 | fput(f); | |
978f946b | 6004 | } |
c3d9714e | 6005 | mddev->bitmap_info.offset = 0; |
978f946b | 6006 | |
1da177e4 LT |
6007 | export_array(mddev); |
6008 | ||
6177b472 | 6009 | md_clean(mddev); |
efeb53c0 N |
6010 | if (mddev->hold_active == UNTIL_STOP) |
6011 | mddev->hold_active = 0; | |
a4bd82d0 | 6012 | } |
d7603b7e | 6013 | md_new_event(mddev); |
00bcb4ac | 6014 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 6015 | return 0; |
1da177e4 LT |
6016 | } |
6017 | ||
fdee8ae4 | 6018 | #ifndef MODULE |
fd01b88c | 6019 | static void autorun_array(struct mddev *mddev) |
1da177e4 | 6020 | { |
3cb03002 | 6021 | struct md_rdev *rdev; |
1da177e4 LT |
6022 | int err; |
6023 | ||
a757e64c | 6024 | if (list_empty(&mddev->disks)) |
1da177e4 | 6025 | return; |
1da177e4 | 6026 | |
9d48739e | 6027 | pr_info("md: running: "); |
1da177e4 | 6028 | |
dafb20fa | 6029 | rdev_for_each(rdev, mddev) { |
1da177e4 | 6030 | char b[BDEVNAME_SIZE]; |
9d48739e | 6031 | pr_cont("<%s>", bdevname(rdev->bdev,b)); |
1da177e4 | 6032 | } |
9d48739e | 6033 | pr_cont("\n"); |
1da177e4 | 6034 | |
d710e138 | 6035 | err = do_md_run(mddev); |
1da177e4 | 6036 | if (err) { |
9d48739e | 6037 | pr_warn("md: do_md_run() returned %d\n", err); |
a05b7ea0 | 6038 | do_md_stop(mddev, 0, NULL); |
1da177e4 LT |
6039 | } |
6040 | } | |
6041 | ||
6042 | /* | |
6043 | * lets try to run arrays based on all disks that have arrived | |
6044 | * until now. (those are in pending_raid_disks) | |
6045 | * | |
6046 | * the method: pick the first pending disk, collect all disks with | |
6047 | * the same UUID, remove all from the pending list and put them into | |
6048 | * the 'same_array' list. Then order this list based on superblock | |
6049 | * update time (freshest comes first), kick out 'old' disks and | |
6050 | * compare superblocks. If everything's fine then run it. | |
6051 | * | |
6052 | * If "unit" is allocated, then bump its reference count | |
6053 | */ | |
6054 | static void autorun_devices(int part) | |
6055 | { | |
3cb03002 | 6056 | struct md_rdev *rdev0, *rdev, *tmp; |
fd01b88c | 6057 | struct mddev *mddev; |
1da177e4 LT |
6058 | char b[BDEVNAME_SIZE]; |
6059 | ||
9d48739e | 6060 | pr_info("md: autorun ...\n"); |
1da177e4 | 6061 | while (!list_empty(&pending_raid_disks)) { |
e8703fe1 | 6062 | int unit; |
1da177e4 | 6063 | dev_t dev; |
ad01c9e3 | 6064 | LIST_HEAD(candidates); |
1da177e4 | 6065 | rdev0 = list_entry(pending_raid_disks.next, |
3cb03002 | 6066 | struct md_rdev, same_set); |
1da177e4 | 6067 | |
9d48739e | 6068 | pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b)); |
1da177e4 | 6069 | INIT_LIST_HEAD(&candidates); |
159ec1fc | 6070 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 | 6071 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
9d48739e N |
6072 | pr_debug("md: adding %s ...\n", |
6073 | bdevname(rdev->bdev,b)); | |
1da177e4 LT |
6074 | list_move(&rdev->same_set, &candidates); |
6075 | } | |
6076 | /* | |
6077 | * now we have a set of devices, with all of them having | |
6078 | * mostly sane superblocks. It's time to allocate the | |
6079 | * mddev. | |
6080 | */ | |
e8703fe1 N |
6081 | if (part) { |
6082 | dev = MKDEV(mdp_major, | |
6083 | rdev0->preferred_minor << MdpMinorShift); | |
6084 | unit = MINOR(dev) >> MdpMinorShift; | |
6085 | } else { | |
6086 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
6087 | unit = MINOR(dev); | |
6088 | } | |
6089 | if (rdev0->preferred_minor != unit) { | |
9d48739e N |
6090 | pr_warn("md: unit number in %s is bad: %d\n", |
6091 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
1da177e4 LT |
6092 | break; |
6093 | } | |
1da177e4 LT |
6094 | |
6095 | md_probe(dev, NULL, NULL); | |
6096 | mddev = mddev_find(dev); | |
9bbbca3a NB |
6097 | if (!mddev || !mddev->gendisk) { |
6098 | if (mddev) | |
6099 | mddev_put(mddev); | |
1da177e4 LT |
6100 | break; |
6101 | } | |
f72ffdd6 | 6102 | if (mddev_lock(mddev)) |
9d48739e | 6103 | pr_warn("md: %s locked, cannot run\n", mdname(mddev)); |
1da177e4 LT |
6104 | else if (mddev->raid_disks || mddev->major_version |
6105 | || !list_empty(&mddev->disks)) { | |
9d48739e | 6106 | pr_warn("md: %s already running, cannot run %s\n", |
1da177e4 LT |
6107 | mdname(mddev), bdevname(rdev0->bdev,b)); |
6108 | mddev_unlock(mddev); | |
6109 | } else { | |
9d48739e | 6110 | pr_debug("md: created %s\n", mdname(mddev)); |
1ec4a939 | 6111 | mddev->persistent = 1; |
159ec1fc | 6112 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
6113 | list_del_init(&rdev->same_set); |
6114 | if (bind_rdev_to_array(rdev, mddev)) | |
6115 | export_rdev(rdev); | |
6116 | } | |
6117 | autorun_array(mddev); | |
6118 | mddev_unlock(mddev); | |
6119 | } | |
6120 | /* on success, candidates will be empty, on error | |
6121 | * it won't... | |
6122 | */ | |
159ec1fc | 6123 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 6124 | list_del_init(&rdev->same_set); |
1da177e4 | 6125 | export_rdev(rdev); |
4b80991c | 6126 | } |
1da177e4 LT |
6127 | mddev_put(mddev); |
6128 | } | |
9d48739e | 6129 | pr_info("md: ... autorun DONE.\n"); |
1da177e4 | 6130 | } |
fdee8ae4 | 6131 | #endif /* !MODULE */ |
1da177e4 | 6132 | |
f72ffdd6 | 6133 | static int get_version(void __user *arg) |
1da177e4 LT |
6134 | { |
6135 | mdu_version_t ver; | |
6136 | ||
6137 | ver.major = MD_MAJOR_VERSION; | |
6138 | ver.minor = MD_MINOR_VERSION; | |
6139 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
6140 | ||
6141 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
6142 | return -EFAULT; | |
6143 | ||
6144 | return 0; | |
6145 | } | |
6146 | ||
f72ffdd6 | 6147 | static int get_array_info(struct mddev *mddev, void __user *arg) |
1da177e4 LT |
6148 | { |
6149 | mdu_array_info_t info; | |
a9f326eb | 6150 | int nr,working,insync,failed,spare; |
3cb03002 | 6151 | struct md_rdev *rdev; |
1da177e4 | 6152 | |
1ca69c4b N |
6153 | nr = working = insync = failed = spare = 0; |
6154 | rcu_read_lock(); | |
6155 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 6156 | nr++; |
b2d444d7 | 6157 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
6158 | failed++; |
6159 | else { | |
6160 | working++; | |
b2d444d7 | 6161 | if (test_bit(In_sync, &rdev->flags)) |
f72ffdd6 | 6162 | insync++; |
b347af81 SL |
6163 | else if (test_bit(Journal, &rdev->flags)) |
6164 | /* TODO: add journal count to md_u.h */ | |
6165 | ; | |
1da177e4 LT |
6166 | else |
6167 | spare++; | |
6168 | } | |
6169 | } | |
1ca69c4b | 6170 | rcu_read_unlock(); |
1da177e4 LT |
6171 | |
6172 | info.major_version = mddev->major_version; | |
6173 | info.minor_version = mddev->minor_version; | |
6174 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
9ebc6ef1 | 6175 | info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX); |
1da177e4 | 6176 | info.level = mddev->level; |
58c0fed4 AN |
6177 | info.size = mddev->dev_sectors / 2; |
6178 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 6179 | info.size = -1; |
1da177e4 LT |
6180 | info.nr_disks = nr; |
6181 | info.raid_disks = mddev->raid_disks; | |
6182 | info.md_minor = mddev->md_minor; | |
6183 | info.not_persistent= !mddev->persistent; | |
6184 | ||
9ebc6ef1 | 6185 | info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX); |
1da177e4 LT |
6186 | info.state = 0; |
6187 | if (mddev->in_sync) | |
6188 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 6189 | if (mddev->bitmap && mddev->bitmap_info.offset) |
9bd35920 | 6190 | info.state |= (1<<MD_SB_BITMAP_PRESENT); |
ca8895d9 GR |
6191 | if (mddev_is_clustered(mddev)) |
6192 | info.state |= (1<<MD_SB_CLUSTERED); | |
a9f326eb | 6193 | info.active_disks = insync; |
1da177e4 LT |
6194 | info.working_disks = working; |
6195 | info.failed_disks = failed; | |
6196 | info.spare_disks = spare; | |
6197 | ||
6198 | info.layout = mddev->layout; | |
9d8f0363 | 6199 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
6200 | |
6201 | if (copy_to_user(arg, &info, sizeof(info))) | |
6202 | return -EFAULT; | |
6203 | ||
6204 | return 0; | |
6205 | } | |
6206 | ||
f72ffdd6 | 6207 | static int get_bitmap_file(struct mddev *mddev, void __user * arg) |
32a7627c N |
6208 | { |
6209 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
f4ad3d38 | 6210 | char *ptr; |
4af1a041 | 6211 | int err; |
32a7627c | 6212 | |
b6878d9e | 6213 | file = kzalloc(sizeof(*file), GFP_NOIO); |
32a7627c | 6214 | if (!file) |
4af1a041 | 6215 | return -ENOMEM; |
32a7627c | 6216 | |
4af1a041 N |
6217 | err = 0; |
6218 | spin_lock(&mddev->lock); | |
25eafe1a BR |
6219 | /* bitmap enabled */ |
6220 | if (mddev->bitmap_info.file) { | |
6221 | ptr = file_path(mddev->bitmap_info.file, file->pathname, | |
6222 | sizeof(file->pathname)); | |
6223 | if (IS_ERR(ptr)) | |
6224 | err = PTR_ERR(ptr); | |
6225 | else | |
6226 | memmove(file->pathname, ptr, | |
6227 | sizeof(file->pathname)-(ptr-file->pathname)); | |
6228 | } | |
4af1a041 | 6229 | spin_unlock(&mddev->lock); |
32a7627c | 6230 | |
4af1a041 N |
6231 | if (err == 0 && |
6232 | copy_to_user(arg, file, sizeof(*file))) | |
32a7627c | 6233 | err = -EFAULT; |
4af1a041 | 6234 | |
32a7627c N |
6235 | kfree(file); |
6236 | return err; | |
6237 | } | |
6238 | ||
f72ffdd6 | 6239 | static int get_disk_info(struct mddev *mddev, void __user * arg) |
1da177e4 LT |
6240 | { |
6241 | mdu_disk_info_t info; | |
3cb03002 | 6242 | struct md_rdev *rdev; |
1da177e4 LT |
6243 | |
6244 | if (copy_from_user(&info, arg, sizeof(info))) | |
6245 | return -EFAULT; | |
6246 | ||
1ca69c4b | 6247 | rcu_read_lock(); |
57d051dc | 6248 | rdev = md_find_rdev_nr_rcu(mddev, info.number); |
1da177e4 LT |
6249 | if (rdev) { |
6250 | info.major = MAJOR(rdev->bdev->bd_dev); | |
6251 | info.minor = MINOR(rdev->bdev->bd_dev); | |
6252 | info.raid_disk = rdev->raid_disk; | |
6253 | info.state = 0; | |
b2d444d7 | 6254 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 6255 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 6256 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
6257 | info.state |= (1<<MD_DISK_ACTIVE); |
6258 | info.state |= (1<<MD_DISK_SYNC); | |
6259 | } | |
9efdca16 | 6260 | if (test_bit(Journal, &rdev->flags)) |
bac624f3 | 6261 | info.state |= (1<<MD_DISK_JOURNAL); |
8ddf9efe N |
6262 | if (test_bit(WriteMostly, &rdev->flags)) |
6263 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
688834e6 N |
6264 | if (test_bit(FailFast, &rdev->flags)) |
6265 | info.state |= (1<<MD_DISK_FAILFAST); | |
1da177e4 LT |
6266 | } else { |
6267 | info.major = info.minor = 0; | |
6268 | info.raid_disk = -1; | |
6269 | info.state = (1<<MD_DISK_REMOVED); | |
6270 | } | |
1ca69c4b | 6271 | rcu_read_unlock(); |
1da177e4 LT |
6272 | |
6273 | if (copy_to_user(arg, &info, sizeof(info))) | |
6274 | return -EFAULT; | |
6275 | ||
6276 | return 0; | |
6277 | } | |
6278 | ||
f72ffdd6 | 6279 | static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info) |
1da177e4 LT |
6280 | { |
6281 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 6282 | struct md_rdev *rdev; |
1da177e4 LT |
6283 | dev_t dev = MKDEV(info->major,info->minor); |
6284 | ||
1aee41f6 GR |
6285 | if (mddev_is_clustered(mddev) && |
6286 | !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) { | |
9d48739e N |
6287 | pr_warn("%s: Cannot add to clustered mddev.\n", |
6288 | mdname(mddev)); | |
1aee41f6 GR |
6289 | return -EINVAL; |
6290 | } | |
6291 | ||
1da177e4 LT |
6292 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) |
6293 | return -EOVERFLOW; | |
6294 | ||
6295 | if (!mddev->raid_disks) { | |
6296 | int err; | |
6297 | /* expecting a device which has a superblock */ | |
6298 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
6299 | if (IS_ERR(rdev)) { | |
9d48739e | 6300 | pr_warn("md: md_import_device returned %ld\n", |
1da177e4 LT |
6301 | PTR_ERR(rdev)); |
6302 | return PTR_ERR(rdev); | |
6303 | } | |
6304 | if (!list_empty(&mddev->disks)) { | |
3cb03002 N |
6305 | struct md_rdev *rdev0 |
6306 | = list_entry(mddev->disks.next, | |
6307 | struct md_rdev, same_set); | |
a9f326eb | 6308 | err = super_types[mddev->major_version] |
1da177e4 LT |
6309 | .load_super(rdev, rdev0, mddev->minor_version); |
6310 | if (err < 0) { | |
9d48739e | 6311 | pr_warn("md: %s has different UUID to %s\n", |
f72ffdd6 | 6312 | bdevname(rdev->bdev,b), |
1da177e4 LT |
6313 | bdevname(rdev0->bdev,b2)); |
6314 | export_rdev(rdev); | |
6315 | return -EINVAL; | |
6316 | } | |
6317 | } | |
6318 | err = bind_rdev_to_array(rdev, mddev); | |
6319 | if (err) | |
6320 | export_rdev(rdev); | |
6321 | return err; | |
6322 | } | |
6323 | ||
6324 | /* | |
6325 | * add_new_disk can be used once the array is assembled | |
6326 | * to add "hot spares". They must already have a superblock | |
6327 | * written | |
6328 | */ | |
6329 | if (mddev->pers) { | |
6330 | int err; | |
6331 | if (!mddev->pers->hot_add_disk) { | |
9d48739e N |
6332 | pr_warn("%s: personality does not support diskops!\n", |
6333 | mdname(mddev)); | |
1da177e4 LT |
6334 | return -EINVAL; |
6335 | } | |
7b1e35f6 N |
6336 | if (mddev->persistent) |
6337 | rdev = md_import_device(dev, mddev->major_version, | |
6338 | mddev->minor_version); | |
6339 | else | |
6340 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 | 6341 | if (IS_ERR(rdev)) { |
9d48739e | 6342 | pr_warn("md: md_import_device returned %ld\n", |
1da177e4 LT |
6343 | PTR_ERR(rdev)); |
6344 | return PTR_ERR(rdev); | |
6345 | } | |
1a855a06 | 6346 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
6347 | if (!mddev->persistent) { |
6348 | if (info->state & (1<<MD_DISK_SYNC) && | |
bf572541 | 6349 | info->raid_disk < mddev->raid_disks) { |
41158c7e | 6350 | rdev->raid_disk = info->raid_disk; |
bf572541 | 6351 | set_bit(In_sync, &rdev->flags); |
8313b8e5 | 6352 | clear_bit(Bitmap_sync, &rdev->flags); |
bf572541 | 6353 | } else |
41158c7e | 6354 | rdev->raid_disk = -1; |
f466722c | 6355 | rdev->saved_raid_disk = rdev->raid_disk; |
41158c7e N |
6356 | } else |
6357 | super_types[mddev->major_version]. | |
6358 | validate_super(mddev, rdev); | |
bedd86b7 | 6359 | if ((info->state & (1<<MD_DISK_SYNC)) && |
f4563091 | 6360 | rdev->raid_disk != info->raid_disk) { |
bedd86b7 N |
6361 | /* This was a hot-add request, but events doesn't |
6362 | * match, so reject it. | |
6363 | */ | |
6364 | export_rdev(rdev); | |
6365 | return -EINVAL; | |
6366 | } | |
6367 | ||
b2d444d7 | 6368 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
6369 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
6370 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
6371 | else |
6372 | clear_bit(WriteMostly, &rdev->flags); | |
688834e6 N |
6373 | if (info->state & (1<<MD_DISK_FAILFAST)) |
6374 | set_bit(FailFast, &rdev->flags); | |
6375 | else | |
6376 | clear_bit(FailFast, &rdev->flags); | |
8ddf9efe | 6377 | |
f6b6ec5c SL |
6378 | if (info->state & (1<<MD_DISK_JOURNAL)) { |
6379 | struct md_rdev *rdev2; | |
6380 | bool has_journal = false; | |
6381 | ||
6382 | /* make sure no existing journal disk */ | |
6383 | rdev_for_each(rdev2, mddev) { | |
6384 | if (test_bit(Journal, &rdev2->flags)) { | |
6385 | has_journal = true; | |
6386 | break; | |
6387 | } | |
6388 | } | |
230b55fa | 6389 | if (has_journal || mddev->bitmap) { |
f6b6ec5c SL |
6390 | export_rdev(rdev); |
6391 | return -EBUSY; | |
6392 | } | |
bac624f3 | 6393 | set_bit(Journal, &rdev->flags); |
f6b6ec5c | 6394 | } |
1aee41f6 GR |
6395 | /* |
6396 | * check whether the device shows up in other nodes | |
6397 | */ | |
6398 | if (mddev_is_clustered(mddev)) { | |
dbb64f86 | 6399 | if (info->state & (1 << MD_DISK_CANDIDATE)) |
1aee41f6 | 6400 | set_bit(Candidate, &rdev->flags); |
dbb64f86 | 6401 | else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) { |
1aee41f6 | 6402 | /* --add initiated by this node */ |
dbb64f86 | 6403 | err = md_cluster_ops->add_new_disk(mddev, rdev); |
1aee41f6 | 6404 | if (err) { |
1aee41f6 GR |
6405 | export_rdev(rdev); |
6406 | return err; | |
6407 | } | |
6408 | } | |
6409 | } | |
6410 | ||
1da177e4 LT |
6411 | rdev->raid_disk = -1; |
6412 | err = bind_rdev_to_array(rdev, mddev); | |
dbb64f86 | 6413 | |
1da177e4 LT |
6414 | if (err) |
6415 | export_rdev(rdev); | |
dbb64f86 GR |
6416 | |
6417 | if (mddev_is_clustered(mddev)) { | |
e566aef1 GJ |
6418 | if (info->state & (1 << MD_DISK_CANDIDATE)) { |
6419 | if (!err) { | |
6420 | err = md_cluster_ops->new_disk_ack(mddev, | |
6421 | err == 0); | |
6422 | if (err) | |
6423 | md_kick_rdev_from_array(rdev); | |
6424 | } | |
6425 | } else { | |
dbb64f86 GR |
6426 | if (err) |
6427 | md_cluster_ops->add_new_disk_cancel(mddev); | |
6428 | else | |
6429 | err = add_bound_rdev(rdev); | |
6430 | } | |
6431 | ||
6432 | } else if (!err) | |
a6da4ef8 | 6433 | err = add_bound_rdev(rdev); |
dbb64f86 | 6434 | |
1da177e4 LT |
6435 | return err; |
6436 | } | |
6437 | ||
6438 | /* otherwise, add_new_disk is only allowed | |
6439 | * for major_version==0 superblocks | |
6440 | */ | |
6441 | if (mddev->major_version != 0) { | |
9d48739e | 6442 | pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev)); |
1da177e4 LT |
6443 | return -EINVAL; |
6444 | } | |
6445 | ||
6446 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
6447 | int err; | |
d710e138 | 6448 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 6449 | if (IS_ERR(rdev)) { |
9d48739e | 6450 | pr_warn("md: error, md_import_device() returned %ld\n", |
1da177e4 LT |
6451 | PTR_ERR(rdev)); |
6452 | return PTR_ERR(rdev); | |
6453 | } | |
6454 | rdev->desc_nr = info->number; | |
6455 | if (info->raid_disk < mddev->raid_disks) | |
6456 | rdev->raid_disk = info->raid_disk; | |
6457 | else | |
6458 | rdev->raid_disk = -1; | |
6459 | ||
1da177e4 | 6460 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
6461 | if (info->state & (1<<MD_DISK_SYNC)) |
6462 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 6463 | |
8ddf9efe N |
6464 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
6465 | set_bit(WriteMostly, &rdev->flags); | |
688834e6 N |
6466 | if (info->state & (1<<MD_DISK_FAILFAST)) |
6467 | set_bit(FailFast, &rdev->flags); | |
8ddf9efe | 6468 | |
1da177e4 | 6469 | if (!mddev->persistent) { |
9d48739e | 6470 | pr_debug("md: nonpersistent superblock ...\n"); |
77304d2a MS |
6471 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
6472 | } else | |
57b2caa3 | 6473 | rdev->sb_start = calc_dev_sboffset(rdev); |
8190e754 | 6474 | rdev->sectors = rdev->sb_start; |
1da177e4 | 6475 | |
2bf071bf N |
6476 | err = bind_rdev_to_array(rdev, mddev); |
6477 | if (err) { | |
6478 | export_rdev(rdev); | |
6479 | return err; | |
6480 | } | |
1da177e4 LT |
6481 | } |
6482 | ||
6483 | return 0; | |
6484 | } | |
6485 | ||
f72ffdd6 | 6486 | static int hot_remove_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
6487 | { |
6488 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 6489 | struct md_rdev *rdev; |
1da177e4 | 6490 | |
1da177e4 LT |
6491 | rdev = find_rdev(mddev, dev); |
6492 | if (!rdev) | |
6493 | return -ENXIO; | |
6494 | ||
2910ff17 GR |
6495 | if (rdev->raid_disk < 0) |
6496 | goto kick_rdev; | |
293467aa | 6497 | |
3ea8929d N |
6498 | clear_bit(Blocked, &rdev->flags); |
6499 | remove_and_add_spares(mddev, rdev); | |
6500 | ||
1da177e4 LT |
6501 | if (rdev->raid_disk >= 0) |
6502 | goto busy; | |
6503 | ||
2910ff17 | 6504 | kick_rdev: |
54a88392 | 6505 | if (mddev_is_clustered(mddev)) |
88bcfef7 GR |
6506 | md_cluster_ops->remove_disk(mddev, rdev); |
6507 | ||
fb56dfef | 6508 | md_kick_rdev_from_array(rdev); |
2953079c | 6509 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
060b0689 N |
6510 | if (mddev->thread) |
6511 | md_wakeup_thread(mddev->thread); | |
6512 | else | |
6513 | md_update_sb(mddev, 1); | |
d7603b7e | 6514 | md_new_event(mddev); |
1da177e4 LT |
6515 | |
6516 | return 0; | |
6517 | busy: | |
9d48739e N |
6518 | pr_debug("md: cannot remove active disk %s from %s ...\n", |
6519 | bdevname(rdev->bdev,b), mdname(mddev)); | |
1da177e4 LT |
6520 | return -EBUSY; |
6521 | } | |
6522 | ||
f72ffdd6 | 6523 | static int hot_add_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
6524 | { |
6525 | char b[BDEVNAME_SIZE]; | |
6526 | int err; | |
3cb03002 | 6527 | struct md_rdev *rdev; |
1da177e4 LT |
6528 | |
6529 | if (!mddev->pers) | |
6530 | return -ENODEV; | |
6531 | ||
6532 | if (mddev->major_version != 0) { | |
9d48739e | 6533 | pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n", |
1da177e4 LT |
6534 | mdname(mddev)); |
6535 | return -EINVAL; | |
6536 | } | |
6537 | if (!mddev->pers->hot_add_disk) { | |
9d48739e | 6538 | pr_warn("%s: personality does not support diskops!\n", |
1da177e4 LT |
6539 | mdname(mddev)); |
6540 | return -EINVAL; | |
6541 | } | |
6542 | ||
d710e138 | 6543 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 6544 | if (IS_ERR(rdev)) { |
9d48739e | 6545 | pr_warn("md: error, md_import_device() returned %ld\n", |
1da177e4 LT |
6546 | PTR_ERR(rdev)); |
6547 | return -EINVAL; | |
6548 | } | |
6549 | ||
6550 | if (mddev->persistent) | |
57b2caa3 | 6551 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 6552 | else |
77304d2a | 6553 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 6554 | |
8190e754 | 6555 | rdev->sectors = rdev->sb_start; |
1da177e4 | 6556 | |
b2d444d7 | 6557 | if (test_bit(Faulty, &rdev->flags)) { |
9d48739e | 6558 | pr_warn("md: can not hot-add faulty %s disk to %s!\n", |
1da177e4 LT |
6559 | bdevname(rdev->bdev,b), mdname(mddev)); |
6560 | err = -EINVAL; | |
6561 | goto abort_export; | |
6562 | } | |
293467aa | 6563 | |
b2d444d7 | 6564 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 6565 | rdev->desc_nr = -1; |
5842730d | 6566 | rdev->saved_raid_disk = -1; |
2bf071bf N |
6567 | err = bind_rdev_to_array(rdev, mddev); |
6568 | if (err) | |
2aa82191 | 6569 | goto abort_export; |
1da177e4 LT |
6570 | |
6571 | /* | |
6572 | * The rest should better be atomic, we can have disk failures | |
6573 | * noticed in interrupt contexts ... | |
6574 | */ | |
6575 | ||
1da177e4 LT |
6576 | rdev->raid_disk = -1; |
6577 | ||
2953079c | 6578 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
060b0689 N |
6579 | if (!mddev->thread) |
6580 | md_update_sb(mddev, 1); | |
1da177e4 LT |
6581 | /* |
6582 | * Kick recovery, maybe this spare has to be added to the | |
6583 | * array immediately. | |
6584 | */ | |
6585 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6586 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 6587 | md_new_event(mddev); |
1da177e4 LT |
6588 | return 0; |
6589 | ||
1da177e4 LT |
6590 | abort_export: |
6591 | export_rdev(rdev); | |
6592 | return err; | |
6593 | } | |
6594 | ||
fd01b88c | 6595 | static int set_bitmap_file(struct mddev *mddev, int fd) |
32a7627c | 6596 | { |
035328c2 | 6597 | int err = 0; |
32a7627c | 6598 | |
36fa3063 | 6599 | if (mddev->pers) { |
d66b1b39 | 6600 | if (!mddev->pers->quiesce || !mddev->thread) |
36fa3063 N |
6601 | return -EBUSY; |
6602 | if (mddev->recovery || mddev->sync_thread) | |
6603 | return -EBUSY; | |
6604 | /* we should be able to change the bitmap.. */ | |
6605 | } | |
32a7627c | 6606 | |
36fa3063 | 6607 | if (fd >= 0) { |
035328c2 | 6608 | struct inode *inode; |
1e594bb2 N |
6609 | struct file *f; |
6610 | ||
6611 | if (mddev->bitmap || mddev->bitmap_info.file) | |
36fa3063 | 6612 | return -EEXIST; /* cannot add when bitmap is present */ |
1e594bb2 | 6613 | f = fget(fd); |
32a7627c | 6614 | |
1e594bb2 | 6615 | if (f == NULL) { |
9d48739e N |
6616 | pr_warn("%s: error: failed to get bitmap file\n", |
6617 | mdname(mddev)); | |
36fa3063 N |
6618 | return -EBADF; |
6619 | } | |
6620 | ||
1e594bb2 | 6621 | inode = f->f_mapping->host; |
035328c2 | 6622 | if (!S_ISREG(inode->i_mode)) { |
9d48739e N |
6623 | pr_warn("%s: error: bitmap file must be a regular file\n", |
6624 | mdname(mddev)); | |
035328c2 | 6625 | err = -EBADF; |
1e594bb2 | 6626 | } else if (!(f->f_mode & FMODE_WRITE)) { |
9d48739e N |
6627 | pr_warn("%s: error: bitmap file must open for write\n", |
6628 | mdname(mddev)); | |
035328c2 N |
6629 | err = -EBADF; |
6630 | } else if (atomic_read(&inode->i_writecount) != 1) { | |
9d48739e N |
6631 | pr_warn("%s: error: bitmap file is already in use\n", |
6632 | mdname(mddev)); | |
035328c2 N |
6633 | err = -EBUSY; |
6634 | } | |
6635 | if (err) { | |
1e594bb2 | 6636 | fput(f); |
36fa3063 N |
6637 | return err; |
6638 | } | |
1e594bb2 | 6639 | mddev->bitmap_info.file = f; |
c3d9714e | 6640 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
6641 | } else if (mddev->bitmap == NULL) |
6642 | return -ENOENT; /* cannot remove what isn't there */ | |
6643 | err = 0; | |
6644 | if (mddev->pers) { | |
69e51b44 | 6645 | if (fd >= 0) { |
f9209a32 GR |
6646 | struct bitmap *bitmap; |
6647 | ||
6648 | bitmap = bitmap_create(mddev, -1); | |
9e1cc0a5 | 6649 | mddev_suspend(mddev); |
f9209a32 GR |
6650 | if (!IS_ERR(bitmap)) { |
6651 | mddev->bitmap = bitmap; | |
69e51b44 | 6652 | err = bitmap_load(mddev); |
ba599aca N |
6653 | } else |
6654 | err = PTR_ERR(bitmap); | |
52a0d49d N |
6655 | if (err) { |
6656 | bitmap_destroy(mddev); | |
6657 | fd = -1; | |
6658 | } | |
9e1cc0a5 | 6659 | mddev_resume(mddev); |
52a0d49d | 6660 | } else if (fd < 0) { |
9e1cc0a5 | 6661 | mddev_suspend(mddev); |
36fa3063 | 6662 | bitmap_destroy(mddev); |
9e1cc0a5 | 6663 | mddev_resume(mddev); |
d7375ab3 | 6664 | } |
d7375ab3 N |
6665 | } |
6666 | if (fd < 0) { | |
4af1a041 N |
6667 | struct file *f = mddev->bitmap_info.file; |
6668 | if (f) { | |
6669 | spin_lock(&mddev->lock); | |
6670 | mddev->bitmap_info.file = NULL; | |
6671 | spin_unlock(&mddev->lock); | |
6672 | fput(f); | |
6673 | } | |
36fa3063 N |
6674 | } |
6675 | ||
32a7627c N |
6676 | return err; |
6677 | } | |
6678 | ||
1da177e4 LT |
6679 | /* |
6680 | * set_array_info is used two different ways | |
6681 | * The original usage is when creating a new array. | |
6682 | * In this usage, raid_disks is > 0 and it together with | |
6683 | * level, size, not_persistent,layout,chunksize determine the | |
6684 | * shape of the array. | |
6685 | * This will always create an array with a type-0.90.0 superblock. | |
6686 | * The newer usage is when assembling an array. | |
6687 | * In this case raid_disks will be 0, and the major_version field is | |
6688 | * use to determine which style super-blocks are to be found on the devices. | |
6689 | * The minor and patch _version numbers are also kept incase the | |
6690 | * super_block handler wishes to interpret them. | |
6691 | */ | |
f72ffdd6 | 6692 | static int set_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
6693 | { |
6694 | ||
6695 | if (info->raid_disks == 0) { | |
6696 | /* just setting version number for superblock loading */ | |
6697 | if (info->major_version < 0 || | |
50511da3 | 6698 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
6699 | super_types[info->major_version].name == NULL) { |
6700 | /* maybe try to auto-load a module? */ | |
9d48739e | 6701 | pr_warn("md: superblock version %d not known\n", |
1da177e4 LT |
6702 | info->major_version); |
6703 | return -EINVAL; | |
6704 | } | |
6705 | mddev->major_version = info->major_version; | |
6706 | mddev->minor_version = info->minor_version; | |
6707 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 6708 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
6709 | /* ensure mddev_put doesn't delete this now that there |
6710 | * is some minimal configuration. | |
6711 | */ | |
9ebc6ef1 | 6712 | mddev->ctime = ktime_get_real_seconds(); |
1da177e4 LT |
6713 | return 0; |
6714 | } | |
6715 | mddev->major_version = MD_MAJOR_VERSION; | |
6716 | mddev->minor_version = MD_MINOR_VERSION; | |
6717 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
9ebc6ef1 | 6718 | mddev->ctime = ktime_get_real_seconds(); |
1da177e4 LT |
6719 | |
6720 | mddev->level = info->level; | |
17115e03 | 6721 | mddev->clevel[0] = 0; |
58c0fed4 | 6722 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
6723 | mddev->raid_disks = info->raid_disks; |
6724 | /* don't set md_minor, it is determined by which /dev/md* was | |
6725 | * openned | |
6726 | */ | |
6727 | if (info->state & (1<<MD_SB_CLEAN)) | |
6728 | mddev->recovery_cp = MaxSector; | |
6729 | else | |
6730 | mddev->recovery_cp = 0; | |
6731 | mddev->persistent = ! info->not_persistent; | |
e691063a | 6732 | mddev->external = 0; |
1da177e4 LT |
6733 | |
6734 | mddev->layout = info->layout; | |
9d8f0363 | 6735 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 | 6736 | |
2953079c | 6737 | if (mddev->persistent) { |
1b3bae49 N |
6738 | mddev->max_disks = MD_SB_DISKS; |
6739 | mddev->flags = 0; | |
6740 | mddev->sb_flags = 0; | |
2953079c SL |
6741 | } |
6742 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); | |
1da177e4 | 6743 | |
c3d9714e | 6744 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 6745 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
c3d9714e | 6746 | mddev->bitmap_info.offset = 0; |
b2a2703c | 6747 | |
f6705578 N |
6748 | mddev->reshape_position = MaxSector; |
6749 | ||
1da177e4 LT |
6750 | /* |
6751 | * Generate a 128 bit UUID | |
6752 | */ | |
6753 | get_random_bytes(mddev->uuid, 16); | |
6754 | ||
f6705578 | 6755 | mddev->new_level = mddev->level; |
664e7c41 | 6756 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
6757 | mddev->new_layout = mddev->layout; |
6758 | mddev->delta_disks = 0; | |
2c810cdd | 6759 | mddev->reshape_backwards = 0; |
f6705578 | 6760 | |
1da177e4 LT |
6761 | return 0; |
6762 | } | |
6763 | ||
fd01b88c | 6764 | void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) |
1f403624 | 6765 | { |
b522adcd DW |
6766 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
6767 | ||
6768 | if (mddev->external_size) | |
6769 | return; | |
6770 | ||
1f403624 DW |
6771 | mddev->array_sectors = array_sectors; |
6772 | } | |
6773 | EXPORT_SYMBOL(md_set_array_sectors); | |
6774 | ||
fd01b88c | 6775 | static int update_size(struct mddev *mddev, sector_t num_sectors) |
a35b0d69 | 6776 | { |
3cb03002 | 6777 | struct md_rdev *rdev; |
a35b0d69 | 6778 | int rv; |
d71f9f88 | 6779 | int fit = (num_sectors == 0); |
818da59f | 6780 | sector_t old_dev_sectors = mddev->dev_sectors; |
ab5a98b1 | 6781 | |
a35b0d69 N |
6782 | if (mddev->pers->resize == NULL) |
6783 | return -EINVAL; | |
d71f9f88 AN |
6784 | /* The "num_sectors" is the number of sectors of each device that |
6785 | * is used. This can only make sense for arrays with redundancy. | |
6786 | * linear and raid0 always use whatever space is available. We can only | |
6787 | * consider changing this number if no resync or reconstruction is | |
6788 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 6789 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
6790 | * of each device. If num_sectors is zero, we find the largest size |
6791 | * that fits. | |
a35b0d69 | 6792 | */ |
f851b60d N |
6793 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
6794 | mddev->sync_thread) | |
a35b0d69 | 6795 | return -EBUSY; |
bd8839e0 N |
6796 | if (mddev->ro) |
6797 | return -EROFS; | |
a4a6125a | 6798 | |
dafb20fa | 6799 | rdev_for_each(rdev, mddev) { |
dd8ac336 | 6800 | sector_t avail = rdev->sectors; |
01ab5662 | 6801 | |
d71f9f88 AN |
6802 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
6803 | num_sectors = avail; | |
6804 | if (avail < num_sectors) | |
a35b0d69 N |
6805 | return -ENOSPC; |
6806 | } | |
d71f9f88 | 6807 | rv = mddev->pers->resize(mddev, num_sectors); |
c9483634 | 6808 | if (!rv) { |
818da59f GJ |
6809 | if (mddev_is_clustered(mddev)) |
6810 | md_cluster_ops->update_size(mddev, old_dev_sectors); | |
6811 | else if (mddev->queue) { | |
c9483634 GJ |
6812 | set_capacity(mddev->gendisk, mddev->array_sectors); |
6813 | revalidate_disk(mddev->gendisk); | |
6814 | } | |
6815 | } | |
a35b0d69 N |
6816 | return rv; |
6817 | } | |
6818 | ||
fd01b88c | 6819 | static int update_raid_disks(struct mddev *mddev, int raid_disks) |
da943b99 N |
6820 | { |
6821 | int rv; | |
c6563a8c | 6822 | struct md_rdev *rdev; |
da943b99 | 6823 | /* change the number of raid disks */ |
63c70c4f | 6824 | if (mddev->pers->check_reshape == NULL) |
da943b99 | 6825 | return -EINVAL; |
bd8839e0 N |
6826 | if (mddev->ro) |
6827 | return -EROFS; | |
da943b99 | 6828 | if (raid_disks <= 0 || |
233fca36 | 6829 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 6830 | return -EINVAL; |
f851b60d N |
6831 | if (mddev->sync_thread || |
6832 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
6833 | mddev->reshape_position != MaxSector) | |
da943b99 | 6834 | return -EBUSY; |
c6563a8c N |
6835 | |
6836 | rdev_for_each(rdev, mddev) { | |
6837 | if (mddev->raid_disks < raid_disks && | |
6838 | rdev->data_offset < rdev->new_data_offset) | |
6839 | return -EINVAL; | |
6840 | if (mddev->raid_disks > raid_disks && | |
6841 | rdev->data_offset > rdev->new_data_offset) | |
6842 | return -EINVAL; | |
6843 | } | |
6844 | ||
63c70c4f | 6845 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
2c810cdd N |
6846 | if (mddev->delta_disks < 0) |
6847 | mddev->reshape_backwards = 1; | |
6848 | else if (mddev->delta_disks > 0) | |
6849 | mddev->reshape_backwards = 0; | |
63c70c4f N |
6850 | |
6851 | rv = mddev->pers->check_reshape(mddev); | |
2c810cdd | 6852 | if (rv < 0) { |
de171cb9 | 6853 | mddev->delta_disks = 0; |
2c810cdd N |
6854 | mddev->reshape_backwards = 0; |
6855 | } | |
da943b99 N |
6856 | return rv; |
6857 | } | |
6858 | ||
1da177e4 LT |
6859 | /* |
6860 | * update_array_info is used to change the configuration of an | |
6861 | * on-line array. | |
6862 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
6863 | * fields in the info are checked against the array. | |
6864 | * Any differences that cannot be handled will cause an error. | |
6865 | * Normally, only one change can be managed at a time. | |
6866 | */ | |
fd01b88c | 6867 | static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
6868 | { |
6869 | int rv = 0; | |
6870 | int cnt = 0; | |
36fa3063 N |
6871 | int state = 0; |
6872 | ||
6873 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 6874 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 6875 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
6876 | |
6877 | if (mddev->major_version != info->major_version || | |
6878 | mddev->minor_version != info->minor_version || | |
6879 | /* mddev->patch_version != info->patch_version || */ | |
6880 | mddev->ctime != info->ctime || | |
6881 | mddev->level != info->level || | |
6882 | /* mddev->layout != info->layout || */ | |
4e023612 | 6883 | mddev->persistent != !info->not_persistent || |
9d8f0363 | 6884 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
6885 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
6886 | ((state^info->state) & 0xfffffe00) | |
6887 | ) | |
1da177e4 LT |
6888 | return -EINVAL; |
6889 | /* Check there is only one change */ | |
58c0fed4 AN |
6890 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
6891 | cnt++; | |
6892 | if (mddev->raid_disks != info->raid_disks) | |
6893 | cnt++; | |
6894 | if (mddev->layout != info->layout) | |
6895 | cnt++; | |
6896 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
6897 | cnt++; | |
6898 | if (cnt == 0) | |
6899 | return 0; | |
6900 | if (cnt > 1) | |
6901 | return -EINVAL; | |
1da177e4 LT |
6902 | |
6903 | if (mddev->layout != info->layout) { | |
6904 | /* Change layout | |
6905 | * we don't need to do anything at the md level, the | |
6906 | * personality will take care of it all. | |
6907 | */ | |
50ac168a | 6908 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 6909 | return -EINVAL; |
597a711b N |
6910 | else { |
6911 | mddev->new_layout = info->layout; | |
50ac168a | 6912 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
6913 | if (rv) |
6914 | mddev->new_layout = mddev->layout; | |
6915 | return rv; | |
6916 | } | |
1da177e4 | 6917 | } |
58c0fed4 | 6918 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 6919 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 6920 | |
da943b99 N |
6921 | if (mddev->raid_disks != info->raid_disks) |
6922 | rv = update_raid_disks(mddev, info->raid_disks); | |
6923 | ||
36fa3063 | 6924 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
293467aa GR |
6925 | if (mddev->pers->quiesce == NULL || mddev->thread == NULL) { |
6926 | rv = -EINVAL; | |
6927 | goto err; | |
6928 | } | |
6929 | if (mddev->recovery || mddev->sync_thread) { | |
6930 | rv = -EBUSY; | |
6931 | goto err; | |
6932 | } | |
36fa3063 | 6933 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { |
f9209a32 | 6934 | struct bitmap *bitmap; |
36fa3063 | 6935 | /* add the bitmap */ |
293467aa GR |
6936 | if (mddev->bitmap) { |
6937 | rv = -EEXIST; | |
6938 | goto err; | |
6939 | } | |
6940 | if (mddev->bitmap_info.default_offset == 0) { | |
6941 | rv = -EINVAL; | |
6942 | goto err; | |
6943 | } | |
c3d9714e N |
6944 | mddev->bitmap_info.offset = |
6945 | mddev->bitmap_info.default_offset; | |
6409bb05 N |
6946 | mddev->bitmap_info.space = |
6947 | mddev->bitmap_info.default_space; | |
f9209a32 | 6948 | bitmap = bitmap_create(mddev, -1); |
9e1cc0a5 | 6949 | mddev_suspend(mddev); |
f9209a32 GR |
6950 | if (!IS_ERR(bitmap)) { |
6951 | mddev->bitmap = bitmap; | |
69e51b44 | 6952 | rv = bitmap_load(mddev); |
ba599aca N |
6953 | } else |
6954 | rv = PTR_ERR(bitmap); | |
36fa3063 N |
6955 | if (rv) |
6956 | bitmap_destroy(mddev); | |
9e1cc0a5 | 6957 | mddev_resume(mddev); |
36fa3063 N |
6958 | } else { |
6959 | /* remove the bitmap */ | |
293467aa GR |
6960 | if (!mddev->bitmap) { |
6961 | rv = -ENOENT; | |
6962 | goto err; | |
6963 | } | |
6964 | if (mddev->bitmap->storage.file) { | |
6965 | rv = -EINVAL; | |
6966 | goto err; | |
6967 | } | |
f6a2dc64 GJ |
6968 | if (mddev->bitmap_info.nodes) { |
6969 | /* hold PW on all the bitmap lock */ | |
6970 | if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) { | |
9d48739e | 6971 | pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n"); |
f6a2dc64 GJ |
6972 | rv = -EPERM; |
6973 | md_cluster_ops->unlock_all_bitmaps(mddev); | |
6974 | goto err; | |
6975 | } | |
6976 | ||
6977 | mddev->bitmap_info.nodes = 0; | |
6978 | md_cluster_ops->leave(mddev); | |
6979 | } | |
9e1cc0a5 | 6980 | mddev_suspend(mddev); |
36fa3063 | 6981 | bitmap_destroy(mddev); |
9e1cc0a5 | 6982 | mddev_resume(mddev); |
c3d9714e | 6983 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
6984 | } |
6985 | } | |
850b2b42 | 6986 | md_update_sb(mddev, 1); |
293467aa GR |
6987 | return rv; |
6988 | err: | |
1da177e4 LT |
6989 | return rv; |
6990 | } | |
6991 | ||
fd01b88c | 6992 | static int set_disk_faulty(struct mddev *mddev, dev_t dev) |
1da177e4 | 6993 | { |
3cb03002 | 6994 | struct md_rdev *rdev; |
1ca69c4b | 6995 | int err = 0; |
1da177e4 LT |
6996 | |
6997 | if (mddev->pers == NULL) | |
6998 | return -ENODEV; | |
6999 | ||
1ca69c4b N |
7000 | rcu_read_lock(); |
7001 | rdev = find_rdev_rcu(mddev, dev); | |
1da177e4 | 7002 | if (!rdev) |
1ca69c4b N |
7003 | err = -ENODEV; |
7004 | else { | |
7005 | md_error(mddev, rdev); | |
7006 | if (!test_bit(Faulty, &rdev->flags)) | |
7007 | err = -EBUSY; | |
7008 | } | |
7009 | rcu_read_unlock(); | |
7010 | return err; | |
1da177e4 LT |
7011 | } |
7012 | ||
2f9618ce AN |
7013 | /* |
7014 | * We have a problem here : there is no easy way to give a CHS | |
7015 | * virtual geometry. We currently pretend that we have a 2 heads | |
7016 | * 4 sectors (with a BIG number of cylinders...). This drives | |
7017 | * dosfs just mad... ;-) | |
7018 | */ | |
a885c8c4 CH |
7019 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
7020 | { | |
fd01b88c | 7021 | struct mddev *mddev = bdev->bd_disk->private_data; |
a885c8c4 CH |
7022 | |
7023 | geo->heads = 2; | |
7024 | geo->sectors = 4; | |
49ce6cea | 7025 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
7026 | return 0; |
7027 | } | |
7028 | ||
cb335f88 NS |
7029 | static inline bool md_ioctl_valid(unsigned int cmd) |
7030 | { | |
7031 | switch (cmd) { | |
7032 | case ADD_NEW_DISK: | |
7033 | case BLKROSET: | |
7034 | case GET_ARRAY_INFO: | |
7035 | case GET_BITMAP_FILE: | |
7036 | case GET_DISK_INFO: | |
7037 | case HOT_ADD_DISK: | |
7038 | case HOT_REMOVE_DISK: | |
cb335f88 NS |
7039 | case RAID_AUTORUN: |
7040 | case RAID_VERSION: | |
7041 | case RESTART_ARRAY_RW: | |
7042 | case RUN_ARRAY: | |
7043 | case SET_ARRAY_INFO: | |
7044 | case SET_BITMAP_FILE: | |
7045 | case SET_DISK_FAULTY: | |
7046 | case STOP_ARRAY: | |
7047 | case STOP_ARRAY_RO: | |
1aee41f6 | 7048 | case CLUSTERED_DISK_NACK: |
cb335f88 NS |
7049 | return true; |
7050 | default: | |
7051 | return false; | |
7052 | } | |
7053 | } | |
7054 | ||
a39907fa | 7055 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
7056 | unsigned int cmd, unsigned long arg) |
7057 | { | |
7058 | int err = 0; | |
7059 | void __user *argp = (void __user *)arg; | |
fd01b88c | 7060 | struct mddev *mddev = NULL; |
e2218350 | 7061 | int ro; |
065e519e | 7062 | bool did_set_md_closing = false; |
1da177e4 | 7063 | |
cb335f88 NS |
7064 | if (!md_ioctl_valid(cmd)) |
7065 | return -ENOTTY; | |
7066 | ||
506c9e44 N |
7067 | switch (cmd) { |
7068 | case RAID_VERSION: | |
7069 | case GET_ARRAY_INFO: | |
7070 | case GET_DISK_INFO: | |
7071 | break; | |
7072 | default: | |
7073 | if (!capable(CAP_SYS_ADMIN)) | |
7074 | return -EACCES; | |
7075 | } | |
1da177e4 LT |
7076 | |
7077 | /* | |
7078 | * Commands dealing with the RAID driver but not any | |
7079 | * particular array: | |
7080 | */ | |
c02c0aeb N |
7081 | switch (cmd) { |
7082 | case RAID_VERSION: | |
7083 | err = get_version(argp); | |
3adc28d8 | 7084 | goto out; |
1da177e4 | 7085 | |
1da177e4 | 7086 | #ifndef MODULE |
c02c0aeb N |
7087 | case RAID_AUTORUN: |
7088 | err = 0; | |
7089 | autostart_arrays(arg); | |
3adc28d8 | 7090 | goto out; |
1da177e4 | 7091 | #endif |
c02c0aeb | 7092 | default:; |
1da177e4 LT |
7093 | } |
7094 | ||
7095 | /* | |
7096 | * Commands creating/starting a new array: | |
7097 | */ | |
7098 | ||
a39907fa | 7099 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
7100 | |
7101 | if (!mddev) { | |
7102 | BUG(); | |
3adc28d8 | 7103 | goto out; |
1da177e4 LT |
7104 | } |
7105 | ||
1ca69c4b N |
7106 | /* Some actions do not requires the mutex */ |
7107 | switch (cmd) { | |
7108 | case GET_ARRAY_INFO: | |
7109 | if (!mddev->raid_disks && !mddev->external) | |
7110 | err = -ENODEV; | |
7111 | else | |
7112 | err = get_array_info(mddev, argp); | |
3adc28d8 | 7113 | goto out; |
1ca69c4b N |
7114 | |
7115 | case GET_DISK_INFO: | |
7116 | if (!mddev->raid_disks && !mddev->external) | |
7117 | err = -ENODEV; | |
7118 | else | |
7119 | err = get_disk_info(mddev, argp); | |
3adc28d8 | 7120 | goto out; |
1ca69c4b N |
7121 | |
7122 | case SET_DISK_FAULTY: | |
7123 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
3adc28d8 | 7124 | goto out; |
4af1a041 N |
7125 | |
7126 | case GET_BITMAP_FILE: | |
7127 | err = get_bitmap_file(mddev, argp); | |
7128 | goto out; | |
7129 | ||
1ca69c4b N |
7130 | } |
7131 | ||
a7a3f08d N |
7132 | if (cmd == ADD_NEW_DISK) |
7133 | /* need to ensure md_delayed_delete() has completed */ | |
7134 | flush_workqueue(md_misc_wq); | |
7135 | ||
90f5f7ad HR |
7136 | if (cmd == HOT_REMOVE_DISK) |
7137 | /* need to ensure recovery thread has run */ | |
7138 | wait_event_interruptible_timeout(mddev->sb_wait, | |
7139 | !test_bit(MD_RECOVERY_NEEDED, | |
82a301cb | 7140 | &mddev->recovery), |
90f5f7ad | 7141 | msecs_to_jiffies(5000)); |
260fa034 N |
7142 | if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) { |
7143 | /* Need to flush page cache, and ensure no-one else opens | |
7144 | * and writes | |
7145 | */ | |
7146 | mutex_lock(&mddev->open_mutex); | |
9ba3b7f5 | 7147 | if (mddev->pers && atomic_read(&mddev->openers) > 1) { |
260fa034 N |
7148 | mutex_unlock(&mddev->open_mutex); |
7149 | err = -EBUSY; | |
3adc28d8 | 7150 | goto out; |
260fa034 | 7151 | } |
065e519e | 7152 | WARN_ON_ONCE(test_bit(MD_CLOSING, &mddev->flags)); |
af8d8e6f | 7153 | set_bit(MD_CLOSING, &mddev->flags); |
065e519e | 7154 | did_set_md_closing = true; |
260fa034 N |
7155 | mutex_unlock(&mddev->open_mutex); |
7156 | sync_blockdev(bdev); | |
7157 | } | |
1da177e4 LT |
7158 | err = mddev_lock(mddev); |
7159 | if (err) { | |
9d48739e N |
7160 | pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n", |
7161 | err, cmd); | |
3adc28d8 | 7162 | goto out; |
1da177e4 LT |
7163 | } |
7164 | ||
c02c0aeb N |
7165 | if (cmd == SET_ARRAY_INFO) { |
7166 | mdu_array_info_t info; | |
7167 | if (!arg) | |
7168 | memset(&info, 0, sizeof(info)); | |
7169 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
7170 | err = -EFAULT; | |
3adc28d8 | 7171 | goto unlock; |
c02c0aeb N |
7172 | } |
7173 | if (mddev->pers) { | |
7174 | err = update_array_info(mddev, &info); | |
7175 | if (err) { | |
9d48739e | 7176 | pr_warn("md: couldn't update array info. %d\n", err); |
3adc28d8 | 7177 | goto unlock; |
1da177e4 | 7178 | } |
3adc28d8 | 7179 | goto unlock; |
c02c0aeb N |
7180 | } |
7181 | if (!list_empty(&mddev->disks)) { | |
9d48739e | 7182 | pr_warn("md: array %s already has disks!\n", mdname(mddev)); |
c02c0aeb | 7183 | err = -EBUSY; |
3adc28d8 | 7184 | goto unlock; |
c02c0aeb N |
7185 | } |
7186 | if (mddev->raid_disks) { | |
9d48739e | 7187 | pr_warn("md: array %s already initialised!\n", mdname(mddev)); |
c02c0aeb | 7188 | err = -EBUSY; |
3adc28d8 | 7189 | goto unlock; |
c02c0aeb N |
7190 | } |
7191 | err = set_array_info(mddev, &info); | |
7192 | if (err) { | |
9d48739e | 7193 | pr_warn("md: couldn't set array info. %d\n", err); |
3adc28d8 | 7194 | goto unlock; |
c02c0aeb | 7195 | } |
3adc28d8 | 7196 | goto unlock; |
1da177e4 LT |
7197 | } |
7198 | ||
7199 | /* | |
7200 | * Commands querying/configuring an existing array: | |
7201 | */ | |
32a7627c | 7202 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 7203 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
7204 | if ((!mddev->raid_disks && !mddev->external) |
7205 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
7206 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
7207 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 | 7208 | err = -ENODEV; |
3adc28d8 | 7209 | goto unlock; |
1da177e4 LT |
7210 | } |
7211 | ||
7212 | /* | |
7213 | * Commands even a read-only array can execute: | |
7214 | */ | |
c02c0aeb | 7215 | switch (cmd) { |
c02c0aeb N |
7216 | case RESTART_ARRAY_RW: |
7217 | err = restart_array(mddev); | |
3adc28d8 | 7218 | goto unlock; |
1da177e4 | 7219 | |
c02c0aeb N |
7220 | case STOP_ARRAY: |
7221 | err = do_md_stop(mddev, 0, bdev); | |
3adc28d8 | 7222 | goto unlock; |
1da177e4 | 7223 | |
c02c0aeb N |
7224 | case STOP_ARRAY_RO: |
7225 | err = md_set_readonly(mddev, bdev); | |
3adc28d8 | 7226 | goto unlock; |
1da177e4 | 7227 | |
3ea8929d N |
7228 | case HOT_REMOVE_DISK: |
7229 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 7230 | goto unlock; |
3ea8929d | 7231 | |
7ceb17e8 N |
7232 | case ADD_NEW_DISK: |
7233 | /* We can support ADD_NEW_DISK on read-only arrays | |
466ad292 | 7234 | * only if we are re-adding a preexisting device. |
7ceb17e8 N |
7235 | * So require mddev->pers and MD_DISK_SYNC. |
7236 | */ | |
7237 | if (mddev->pers) { | |
7238 | mdu_disk_info_t info; | |
7239 | if (copy_from_user(&info, argp, sizeof(info))) | |
7240 | err = -EFAULT; | |
7241 | else if (!(info.state & (1<<MD_DISK_SYNC))) | |
7242 | /* Need to clear read-only for this */ | |
7243 | break; | |
7244 | else | |
7245 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 7246 | goto unlock; |
7ceb17e8 N |
7247 | } |
7248 | break; | |
7249 | ||
c02c0aeb N |
7250 | case BLKROSET: |
7251 | if (get_user(ro, (int __user *)(arg))) { | |
7252 | err = -EFAULT; | |
3adc28d8 | 7253 | goto unlock; |
c02c0aeb N |
7254 | } |
7255 | err = -EINVAL; | |
e2218350 | 7256 | |
c02c0aeb N |
7257 | /* if the bdev is going readonly the value of mddev->ro |
7258 | * does not matter, no writes are coming | |
7259 | */ | |
7260 | if (ro) | |
3adc28d8 | 7261 | goto unlock; |
e2218350 | 7262 | |
c02c0aeb N |
7263 | /* are we are already prepared for writes? */ |
7264 | if (mddev->ro != 1) | |
3adc28d8 | 7265 | goto unlock; |
e2218350 | 7266 | |
c02c0aeb N |
7267 | /* transitioning to readauto need only happen for |
7268 | * arrays that call md_write_start | |
7269 | */ | |
7270 | if (mddev->pers) { | |
7271 | err = restart_array(mddev); | |
7272 | if (err == 0) { | |
7273 | mddev->ro = 2; | |
7274 | set_disk_ro(mddev->gendisk, 0); | |
e2218350 | 7275 | } |
c02c0aeb | 7276 | } |
3adc28d8 | 7277 | goto unlock; |
1da177e4 LT |
7278 | } |
7279 | ||
7280 | /* | |
7281 | * The remaining ioctls are changing the state of the | |
f91de92e | 7282 | * superblock, so we do not allow them on read-only arrays. |
1da177e4 | 7283 | */ |
326eb17d | 7284 | if (mddev->ro && mddev->pers) { |
f91de92e N |
7285 | if (mddev->ro == 2) { |
7286 | mddev->ro = 0; | |
00bcb4ac | 7287 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 7288 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f3378b48 N |
7289 | /* mddev_unlock will wake thread */ |
7290 | /* If a device failed while we were read-only, we | |
7291 | * need to make sure the metadata is updated now. | |
7292 | */ | |
2953079c | 7293 | if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) { |
f3378b48 N |
7294 | mddev_unlock(mddev); |
7295 | wait_event(mddev->sb_wait, | |
2953079c SL |
7296 | !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) && |
7297 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); | |
29f097c4 | 7298 | mddev_lock_nointr(mddev); |
f3378b48 | 7299 | } |
f91de92e N |
7300 | } else { |
7301 | err = -EROFS; | |
3adc28d8 | 7302 | goto unlock; |
f91de92e | 7303 | } |
1da177e4 LT |
7304 | } |
7305 | ||
c02c0aeb N |
7306 | switch (cmd) { |
7307 | case ADD_NEW_DISK: | |
1da177e4 | 7308 | { |
c02c0aeb N |
7309 | mdu_disk_info_t info; |
7310 | if (copy_from_user(&info, argp, sizeof(info))) | |
7311 | err = -EFAULT; | |
7312 | else | |
7313 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 7314 | goto unlock; |
c02c0aeb | 7315 | } |
1da177e4 | 7316 | |
1aee41f6 GR |
7317 | case CLUSTERED_DISK_NACK: |
7318 | if (mddev_is_clustered(mddev)) | |
7319 | md_cluster_ops->new_disk_ack(mddev, false); | |
7320 | else | |
7321 | err = -EINVAL; | |
7322 | goto unlock; | |
7323 | ||
c02c0aeb N |
7324 | case HOT_ADD_DISK: |
7325 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 7326 | goto unlock; |
1da177e4 | 7327 | |
c02c0aeb N |
7328 | case RUN_ARRAY: |
7329 | err = do_md_run(mddev); | |
3adc28d8 | 7330 | goto unlock; |
1da177e4 | 7331 | |
c02c0aeb N |
7332 | case SET_BITMAP_FILE: |
7333 | err = set_bitmap_file(mddev, (int)arg); | |
3adc28d8 | 7334 | goto unlock; |
32a7627c | 7335 | |
c02c0aeb N |
7336 | default: |
7337 | err = -EINVAL; | |
3adc28d8 | 7338 | goto unlock; |
1da177e4 LT |
7339 | } |
7340 | ||
3adc28d8 | 7341 | unlock: |
d3374825 N |
7342 | if (mddev->hold_active == UNTIL_IOCTL && |
7343 | err != -EINVAL) | |
7344 | mddev->hold_active = 0; | |
1da177e4 | 7345 | mddev_unlock(mddev); |
3adc28d8 | 7346 | out: |
065e519e N |
7347 | if(did_set_md_closing) |
7348 | clear_bit(MD_CLOSING, &mddev->flags); | |
1da177e4 LT |
7349 | return err; |
7350 | } | |
aa98aa31 AB |
7351 | #ifdef CONFIG_COMPAT |
7352 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
7353 | unsigned int cmd, unsigned long arg) | |
7354 | { | |
7355 | switch (cmd) { | |
7356 | case HOT_REMOVE_DISK: | |
7357 | case HOT_ADD_DISK: | |
7358 | case SET_DISK_FAULTY: | |
7359 | case SET_BITMAP_FILE: | |
7360 | /* These take in integer arg, do not convert */ | |
7361 | break; | |
7362 | default: | |
7363 | arg = (unsigned long)compat_ptr(arg); | |
7364 | break; | |
7365 | } | |
7366 | ||
7367 | return md_ioctl(bdev, mode, cmd, arg); | |
7368 | } | |
7369 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 7370 | |
a39907fa | 7371 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
7372 | { |
7373 | /* | |
7374 | * Succeed if we can lock the mddev, which confirms that | |
7375 | * it isn't being stopped right now. | |
7376 | */ | |
fd01b88c | 7377 | struct mddev *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
7378 | int err; |
7379 | ||
0c098220 YL |
7380 | if (!mddev) |
7381 | return -ENODEV; | |
7382 | ||
d3374825 N |
7383 | if (mddev->gendisk != bdev->bd_disk) { |
7384 | /* we are racing with mddev_put which is discarding this | |
7385 | * bd_disk. | |
7386 | */ | |
7387 | mddev_put(mddev); | |
7388 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 7389 | flush_workqueue(md_misc_wq); |
d3374825 N |
7390 | /* Then retry the open from the top */ |
7391 | return -ERESTARTSYS; | |
7392 | } | |
7393 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
7394 | ||
c8c00a69 | 7395 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
7396 | goto out; |
7397 | ||
af8d8e6f GJ |
7398 | if (test_bit(MD_CLOSING, &mddev->flags)) { |
7399 | mutex_unlock(&mddev->open_mutex); | |
e2342ca8 N |
7400 | err = -ENODEV; |
7401 | goto out; | |
af8d8e6f GJ |
7402 | } |
7403 | ||
1da177e4 | 7404 | err = 0; |
f2ea68cf | 7405 | atomic_inc(&mddev->openers); |
c8c00a69 | 7406 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 7407 | |
f0b4f7e2 | 7408 | check_disk_change(bdev); |
1da177e4 | 7409 | out: |
e2342ca8 N |
7410 | if (err) |
7411 | mddev_put(mddev); | |
1da177e4 LT |
7412 | return err; |
7413 | } | |
7414 | ||
db2a144b | 7415 | static void md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 7416 | { |
f72ffdd6 | 7417 | struct mddev *mddev = disk->private_data; |
1da177e4 | 7418 | |
52e5f9d1 | 7419 | BUG_ON(!mddev); |
f2ea68cf | 7420 | atomic_dec(&mddev->openers); |
1da177e4 | 7421 | mddev_put(mddev); |
1da177e4 | 7422 | } |
f0b4f7e2 N |
7423 | |
7424 | static int md_media_changed(struct gendisk *disk) | |
7425 | { | |
fd01b88c | 7426 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
7427 | |
7428 | return mddev->changed; | |
7429 | } | |
7430 | ||
7431 | static int md_revalidate(struct gendisk *disk) | |
7432 | { | |
fd01b88c | 7433 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
7434 | |
7435 | mddev->changed = 0; | |
7436 | return 0; | |
7437 | } | |
83d5cde4 | 7438 | static const struct block_device_operations md_fops = |
1da177e4 LT |
7439 | { |
7440 | .owner = THIS_MODULE, | |
a39907fa AV |
7441 | .open = md_open, |
7442 | .release = md_release, | |
b492b852 | 7443 | .ioctl = md_ioctl, |
aa98aa31 AB |
7444 | #ifdef CONFIG_COMPAT |
7445 | .compat_ioctl = md_compat_ioctl, | |
7446 | #endif | |
a885c8c4 | 7447 | .getgeo = md_getgeo, |
f0b4f7e2 N |
7448 | .media_changed = md_media_changed, |
7449 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
7450 | }; |
7451 | ||
f72ffdd6 | 7452 | static int md_thread(void *arg) |
1da177e4 | 7453 | { |
2b8bf345 | 7454 | struct md_thread *thread = arg; |
1da177e4 | 7455 | |
1da177e4 LT |
7456 | /* |
7457 | * md_thread is a 'system-thread', it's priority should be very | |
7458 | * high. We avoid resource deadlocks individually in each | |
7459 | * raid personality. (RAID5 does preallocation) We also use RR and | |
7460 | * the very same RT priority as kswapd, thus we will never get | |
7461 | * into a priority inversion deadlock. | |
7462 | * | |
7463 | * we definitely have to have equal or higher priority than | |
7464 | * bdflush, otherwise bdflush will deadlock if there are too | |
7465 | * many dirty RAID5 blocks. | |
7466 | */ | |
1da177e4 | 7467 | |
6985c43f | 7468 | allow_signal(SIGKILL); |
a6fb0934 | 7469 | while (!kthread_should_stop()) { |
1da177e4 | 7470 | |
93588e22 N |
7471 | /* We need to wait INTERRUPTIBLE so that |
7472 | * we don't add to the load-average. | |
7473 | * That means we need to be sure no signals are | |
7474 | * pending | |
7475 | */ | |
7476 | if (signal_pending(current)) | |
7477 | flush_signals(current); | |
7478 | ||
7479 | wait_event_interruptible_timeout | |
7480 | (thread->wqueue, | |
7481 | test_bit(THREAD_WAKEUP, &thread->flags) | |
ce1ccd07 | 7482 | || kthread_should_stop() || kthread_should_park(), |
93588e22 | 7483 | thread->timeout); |
1da177e4 | 7484 | |
6c987910 | 7485 | clear_bit(THREAD_WAKEUP, &thread->flags); |
ce1ccd07 SL |
7486 | if (kthread_should_park()) |
7487 | kthread_parkme(); | |
6c987910 | 7488 | if (!kthread_should_stop()) |
4ed8731d | 7489 | thread->run(thread); |
1da177e4 | 7490 | } |
a6fb0934 | 7491 | |
1da177e4 LT |
7492 | return 0; |
7493 | } | |
7494 | ||
2b8bf345 | 7495 | void md_wakeup_thread(struct md_thread *thread) |
1da177e4 LT |
7496 | { |
7497 | if (thread) { | |
36a4e1fe | 7498 | pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); |
d1d90147 GJ |
7499 | set_bit(THREAD_WAKEUP, &thread->flags); |
7500 | wake_up(&thread->wqueue); | |
1da177e4 LT |
7501 | } |
7502 | } | |
6c144d31 | 7503 | EXPORT_SYMBOL(md_wakeup_thread); |
1da177e4 | 7504 | |
4ed8731d SL |
7505 | struct md_thread *md_register_thread(void (*run) (struct md_thread *), |
7506 | struct mddev *mddev, const char *name) | |
1da177e4 | 7507 | { |
2b8bf345 | 7508 | struct md_thread *thread; |
1da177e4 | 7509 | |
2b8bf345 | 7510 | thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); |
1da177e4 LT |
7511 | if (!thread) |
7512 | return NULL; | |
7513 | ||
1da177e4 LT |
7514 | init_waitqueue_head(&thread->wqueue); |
7515 | ||
1da177e4 LT |
7516 | thread->run = run; |
7517 | thread->mddev = mddev; | |
32a7627c | 7518 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
7519 | thread->tsk = kthread_run(md_thread, thread, |
7520 | "%s_%s", | |
7521 | mdname(thread->mddev), | |
0232605d | 7522 | name); |
a6fb0934 | 7523 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
7524 | kfree(thread); |
7525 | return NULL; | |
7526 | } | |
1da177e4 LT |
7527 | return thread; |
7528 | } | |
6c144d31 | 7529 | EXPORT_SYMBOL(md_register_thread); |
1da177e4 | 7530 | |
2b8bf345 | 7531 | void md_unregister_thread(struct md_thread **threadp) |
1da177e4 | 7532 | { |
2b8bf345 | 7533 | struct md_thread *thread = *threadp; |
e0cf8f04 N |
7534 | if (!thread) |
7535 | return; | |
36a4e1fe | 7536 | pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
01f96c0a N |
7537 | /* Locking ensures that mddev_unlock does not wake_up a |
7538 | * non-existent thread | |
7539 | */ | |
7540 | spin_lock(&pers_lock); | |
7541 | *threadp = NULL; | |
7542 | spin_unlock(&pers_lock); | |
a6fb0934 N |
7543 | |
7544 | kthread_stop(thread->tsk); | |
1da177e4 LT |
7545 | kfree(thread); |
7546 | } | |
6c144d31 | 7547 | EXPORT_SYMBOL(md_unregister_thread); |
1da177e4 | 7548 | |
fd01b88c | 7549 | void md_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 7550 | { |
b2d444d7 | 7551 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 7552 | return; |
6bfe0b49 | 7553 | |
de393cde | 7554 | if (!mddev->pers || !mddev->pers->error_handler) |
1da177e4 LT |
7555 | return; |
7556 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
7557 | if (mddev->degraded) |
7558 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 7559 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
7560 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7561 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7562 | md_wakeup_thread(mddev->thread); | |
768a418d | 7563 | if (mddev->event_work.func) |
e804ac78 | 7564 | queue_work(md_misc_wq, &mddev->event_work); |
bb9ef716 | 7565 | md_new_event(mddev); |
1da177e4 | 7566 | } |
6c144d31 | 7567 | EXPORT_SYMBOL(md_error); |
1da177e4 LT |
7568 | |
7569 | /* seq_file implementation /proc/mdstat */ | |
7570 | ||
7571 | static void status_unused(struct seq_file *seq) | |
7572 | { | |
7573 | int i = 0; | |
3cb03002 | 7574 | struct md_rdev *rdev; |
1da177e4 LT |
7575 | |
7576 | seq_printf(seq, "unused devices: "); | |
7577 | ||
159ec1fc | 7578 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
7579 | char b[BDEVNAME_SIZE]; |
7580 | i++; | |
7581 | seq_printf(seq, "%s ", | |
7582 | bdevname(rdev->bdev,b)); | |
7583 | } | |
7584 | if (!i) | |
7585 | seq_printf(seq, "<none>"); | |
7586 | ||
7587 | seq_printf(seq, "\n"); | |
7588 | } | |
7589 | ||
f7851be7 | 7590 | static int status_resync(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 7591 | { |
dd71cf6b N |
7592 | sector_t max_sectors, resync, res; |
7593 | unsigned long dt, db; | |
7594 | sector_t rt; | |
4588b42e N |
7595 | int scale; |
7596 | unsigned int per_milli; | |
1da177e4 | 7597 | |
c804cdec N |
7598 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
7599 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
dd71cf6b | 7600 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 7601 | else |
dd71cf6b | 7602 | max_sectors = mddev->dev_sectors; |
1da177e4 | 7603 | |
f7851be7 N |
7604 | resync = mddev->curr_resync; |
7605 | if (resync <= 3) { | |
7606 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
7607 | /* Still cleaning up */ | |
7608 | resync = max_sectors; | |
7609 | } else | |
7610 | resync -= atomic_read(&mddev->recovery_active); | |
7611 | ||
7612 | if (resync == 0) { | |
7613 | if (mddev->recovery_cp < MaxSector) { | |
7614 | seq_printf(seq, "\tresync=PENDING"); | |
7615 | return 1; | |
7616 | } | |
7617 | return 0; | |
7618 | } | |
7619 | if (resync < 3) { | |
7620 | seq_printf(seq, "\tresync=DELAYED"); | |
7621 | return 1; | |
7622 | } | |
7623 | ||
403df478 | 7624 | WARN_ON(max_sectors == 0); |
4588b42e | 7625 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 7626 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
7627 | * u32, as those are the requirements for sector_div. |
7628 | * Thus 'scale' must be at least 10 | |
7629 | */ | |
7630 | scale = 10; | |
7631 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 7632 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
7633 | scale++; |
7634 | } | |
7635 | res = (resync>>scale)*1000; | |
dd71cf6b | 7636 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
7637 | |
7638 | per_milli = res; | |
1da177e4 | 7639 | { |
4588b42e | 7640 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
7641 | seq_printf(seq, "["); |
7642 | for (i = 0; i < x; i++) | |
7643 | seq_printf(seq, "="); | |
7644 | seq_printf(seq, ">"); | |
7645 | for (i = 0; i < y; i++) | |
7646 | seq_printf(seq, "."); | |
7647 | seq_printf(seq, "] "); | |
7648 | } | |
4588b42e | 7649 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
7650 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
7651 | "reshape" : | |
61df9d91 N |
7652 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
7653 | "check" : | |
7654 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
7655 | "resync" : "recovery"))), | |
7656 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
7657 | (unsigned long long) resync/2, |
7658 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
7659 | |
7660 | /* | |
1da177e4 LT |
7661 | * dt: time from mark until now |
7662 | * db: blocks written from mark until now | |
7663 | * rt: remaining time | |
dd71cf6b N |
7664 | * |
7665 | * rt is a sector_t, so could be 32bit or 64bit. | |
7666 | * So we divide before multiply in case it is 32bit and close | |
7667 | * to the limit. | |
25985edc | 7668 | * We scale the divisor (db) by 32 to avoid losing precision |
dd71cf6b N |
7669 | * near the end of resync when the number of remaining sectors |
7670 | * is close to 'db'. | |
7671 | * We then divide rt by 32 after multiplying by db to compensate. | |
7672 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
7673 | */ |
7674 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
7675 | if (!dt) dt++; | |
ff4e8d9a N |
7676 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
7677 | - mddev->resync_mark_cnt; | |
1da177e4 | 7678 | |
dd71cf6b N |
7679 | rt = max_sectors - resync; /* number of remaining sectors */ |
7680 | sector_div(rt, db/32+1); | |
7681 | rt *= dt; | |
7682 | rt >>= 5; | |
7683 | ||
7684 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
7685 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 7686 | |
ff4e8d9a | 7687 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
f7851be7 | 7688 | return 1; |
1da177e4 LT |
7689 | } |
7690 | ||
7691 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
7692 | { | |
7693 | struct list_head *tmp; | |
7694 | loff_t l = *pos; | |
fd01b88c | 7695 | struct mddev *mddev; |
1da177e4 LT |
7696 | |
7697 | if (l >= 0x10000) | |
7698 | return NULL; | |
7699 | if (!l--) | |
7700 | /* header */ | |
7701 | return (void*)1; | |
7702 | ||
7703 | spin_lock(&all_mddevs_lock); | |
7704 | list_for_each(tmp,&all_mddevs) | |
7705 | if (!l--) { | |
fd01b88c | 7706 | mddev = list_entry(tmp, struct mddev, all_mddevs); |
1da177e4 LT |
7707 | mddev_get(mddev); |
7708 | spin_unlock(&all_mddevs_lock); | |
7709 | return mddev; | |
7710 | } | |
7711 | spin_unlock(&all_mddevs_lock); | |
7712 | if (!l--) | |
7713 | return (void*)2;/* tail */ | |
7714 | return NULL; | |
7715 | } | |
7716 | ||
7717 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
7718 | { | |
7719 | struct list_head *tmp; | |
fd01b88c | 7720 | struct mddev *next_mddev, *mddev = v; |
f72ffdd6 | 7721 | |
1da177e4 LT |
7722 | ++*pos; |
7723 | if (v == (void*)2) | |
7724 | return NULL; | |
7725 | ||
7726 | spin_lock(&all_mddevs_lock); | |
7727 | if (v == (void*)1) | |
7728 | tmp = all_mddevs.next; | |
7729 | else | |
7730 | tmp = mddev->all_mddevs.next; | |
7731 | if (tmp != &all_mddevs) | |
fd01b88c | 7732 | next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); |
1da177e4 LT |
7733 | else { |
7734 | next_mddev = (void*)2; | |
7735 | *pos = 0x10000; | |
f72ffdd6 | 7736 | } |
1da177e4 LT |
7737 | spin_unlock(&all_mddevs_lock); |
7738 | ||
7739 | if (v != (void*)1) | |
7740 | mddev_put(mddev); | |
7741 | return next_mddev; | |
7742 | ||
7743 | } | |
7744 | ||
7745 | static void md_seq_stop(struct seq_file *seq, void *v) | |
7746 | { | |
fd01b88c | 7747 | struct mddev *mddev = v; |
1da177e4 LT |
7748 | |
7749 | if (mddev && v != (void*)1 && v != (void*)2) | |
7750 | mddev_put(mddev); | |
7751 | } | |
7752 | ||
7753 | static int md_seq_show(struct seq_file *seq, void *v) | |
7754 | { | |
fd01b88c | 7755 | struct mddev *mddev = v; |
dd8ac336 | 7756 | sector_t sectors; |
3cb03002 | 7757 | struct md_rdev *rdev; |
1da177e4 LT |
7758 | |
7759 | if (v == (void*)1) { | |
84fc4b56 | 7760 | struct md_personality *pers; |
1da177e4 LT |
7761 | seq_printf(seq, "Personalities : "); |
7762 | spin_lock(&pers_lock); | |
2604b703 N |
7763 | list_for_each_entry(pers, &pers_list, list) |
7764 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
7765 | |
7766 | spin_unlock(&pers_lock); | |
7767 | seq_printf(seq, "\n"); | |
f1514638 | 7768 | seq->poll_event = atomic_read(&md_event_count); |
1da177e4 LT |
7769 | return 0; |
7770 | } | |
7771 | if (v == (void*)2) { | |
7772 | status_unused(seq); | |
7773 | return 0; | |
7774 | } | |
7775 | ||
36d091f4 | 7776 | spin_lock(&mddev->lock); |
1da177e4 LT |
7777 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
7778 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
7779 | mddev->pers ? "" : "in"); | |
7780 | if (mddev->pers) { | |
f91de92e | 7781 | if (mddev->ro==1) |
1da177e4 | 7782 | seq_printf(seq, " (read-only)"); |
f91de92e | 7783 | if (mddev->ro==2) |
52720ae7 | 7784 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
7785 | seq_printf(seq, " %s", mddev->pers->name); |
7786 | } | |
7787 | ||
dd8ac336 | 7788 | sectors = 0; |
f97fcad3 N |
7789 | rcu_read_lock(); |
7790 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 LT |
7791 | char b[BDEVNAME_SIZE]; |
7792 | seq_printf(seq, " %s[%d]", | |
7793 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
7794 | if (test_bit(WriteMostly, &rdev->flags)) |
7795 | seq_printf(seq, "(W)"); | |
9efdca16 SL |
7796 | if (test_bit(Journal, &rdev->flags)) |
7797 | seq_printf(seq, "(J)"); | |
b2d444d7 | 7798 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
7799 | seq_printf(seq, "(F)"); |
7800 | continue; | |
2d78f8c4 N |
7801 | } |
7802 | if (rdev->raid_disk < 0) | |
b325a32e | 7803 | seq_printf(seq, "(S)"); /* spare */ |
2d78f8c4 N |
7804 | if (test_bit(Replacement, &rdev->flags)) |
7805 | seq_printf(seq, "(R)"); | |
dd8ac336 | 7806 | sectors += rdev->sectors; |
1da177e4 | 7807 | } |
f97fcad3 | 7808 | rcu_read_unlock(); |
1da177e4 LT |
7809 | |
7810 | if (!list_empty(&mddev->disks)) { | |
7811 | if (mddev->pers) | |
7812 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
7813 | (unsigned long long) |
7814 | mddev->array_sectors / 2); | |
1da177e4 LT |
7815 | else |
7816 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 7817 | (unsigned long long)sectors / 2); |
1da177e4 | 7818 | } |
1cd6bf19 N |
7819 | if (mddev->persistent) { |
7820 | if (mddev->major_version != 0 || | |
7821 | mddev->minor_version != 90) { | |
7822 | seq_printf(seq," super %d.%d", | |
7823 | mddev->major_version, | |
7824 | mddev->minor_version); | |
7825 | } | |
e691063a N |
7826 | } else if (mddev->external) |
7827 | seq_printf(seq, " super external:%s", | |
7828 | mddev->metadata_type); | |
7829 | else | |
1cd6bf19 | 7830 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
7831 | |
7832 | if (mddev->pers) { | |
d710e138 | 7833 | mddev->pers->status(seq, mddev); |
f72ffdd6 | 7834 | seq_printf(seq, "\n "); |
8e1b39d6 | 7835 | if (mddev->pers->sync_request) { |
f7851be7 | 7836 | if (status_resync(seq, mddev)) |
8e1b39d6 | 7837 | seq_printf(seq, "\n "); |
8e1b39d6 | 7838 | } |
32a7627c N |
7839 | } else |
7840 | seq_printf(seq, "\n "); | |
7841 | ||
57148964 | 7842 | bitmap_status(seq, mddev->bitmap); |
1da177e4 LT |
7843 | |
7844 | seq_printf(seq, "\n"); | |
7845 | } | |
36d091f4 | 7846 | spin_unlock(&mddev->lock); |
f72ffdd6 | 7847 | |
1da177e4 LT |
7848 | return 0; |
7849 | } | |
7850 | ||
110518bc | 7851 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
7852 | .start = md_seq_start, |
7853 | .next = md_seq_next, | |
7854 | .stop = md_seq_stop, | |
7855 | .show = md_seq_show, | |
7856 | }; | |
7857 | ||
7858 | static int md_seq_open(struct inode *inode, struct file *file) | |
7859 | { | |
f1514638 | 7860 | struct seq_file *seq; |
1da177e4 LT |
7861 | int error; |
7862 | ||
7863 | error = seq_open(file, &md_seq_ops); | |
d7603b7e | 7864 | if (error) |
f1514638 KS |
7865 | return error; |
7866 | ||
7867 | seq = file->private_data; | |
7868 | seq->poll_event = atomic_read(&md_event_count); | |
1da177e4 LT |
7869 | return error; |
7870 | } | |
7871 | ||
e2f23b60 | 7872 | static int md_unloading; |
d7603b7e N |
7873 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
7874 | { | |
f1514638 | 7875 | struct seq_file *seq = filp->private_data; |
d7603b7e N |
7876 | int mask; |
7877 | ||
e2f23b60 | 7878 | if (md_unloading) |
7d7e64f2 | 7879 | return POLLIN|POLLRDNORM|POLLERR|POLLPRI; |
d7603b7e N |
7880 | poll_wait(filp, &md_event_waiters, wait); |
7881 | ||
7882 | /* always allow read */ | |
7883 | mask = POLLIN | POLLRDNORM; | |
7884 | ||
f1514638 | 7885 | if (seq->poll_event != atomic_read(&md_event_count)) |
d7603b7e N |
7886 | mask |= POLLERR | POLLPRI; |
7887 | return mask; | |
7888 | } | |
7889 | ||
fa027c2a | 7890 | static const struct file_operations md_seq_fops = { |
e24650c2 | 7891 | .owner = THIS_MODULE, |
1da177e4 LT |
7892 | .open = md_seq_open, |
7893 | .read = seq_read, | |
7894 | .llseek = seq_lseek, | |
26e13043 | 7895 | .release = seq_release, |
d7603b7e | 7896 | .poll = mdstat_poll, |
1da177e4 LT |
7897 | }; |
7898 | ||
84fc4b56 | 7899 | int register_md_personality(struct md_personality *p) |
1da177e4 | 7900 | { |
9d48739e N |
7901 | pr_debug("md: %s personality registered for level %d\n", |
7902 | p->name, p->level); | |
1da177e4 | 7903 | spin_lock(&pers_lock); |
2604b703 | 7904 | list_add_tail(&p->list, &pers_list); |
1da177e4 LT |
7905 | spin_unlock(&pers_lock); |
7906 | return 0; | |
7907 | } | |
6c144d31 | 7908 | EXPORT_SYMBOL(register_md_personality); |
1da177e4 | 7909 | |
84fc4b56 | 7910 | int unregister_md_personality(struct md_personality *p) |
1da177e4 | 7911 | { |
9d48739e | 7912 | pr_debug("md: %s personality unregistered\n", p->name); |
1da177e4 | 7913 | spin_lock(&pers_lock); |
2604b703 | 7914 | list_del_init(&p->list); |
1da177e4 LT |
7915 | spin_unlock(&pers_lock); |
7916 | return 0; | |
7917 | } | |
6c144d31 | 7918 | EXPORT_SYMBOL(unregister_md_personality); |
1da177e4 | 7919 | |
6022e75b N |
7920 | int register_md_cluster_operations(struct md_cluster_operations *ops, |
7921 | struct module *module) | |
edb39c9d | 7922 | { |
6022e75b | 7923 | int ret = 0; |
edb39c9d | 7924 | spin_lock(&pers_lock); |
6022e75b N |
7925 | if (md_cluster_ops != NULL) |
7926 | ret = -EALREADY; | |
7927 | else { | |
7928 | md_cluster_ops = ops; | |
7929 | md_cluster_mod = module; | |
7930 | } | |
edb39c9d | 7931 | spin_unlock(&pers_lock); |
6022e75b | 7932 | return ret; |
edb39c9d GR |
7933 | } |
7934 | EXPORT_SYMBOL(register_md_cluster_operations); | |
7935 | ||
7936 | int unregister_md_cluster_operations(void) | |
7937 | { | |
7938 | spin_lock(&pers_lock); | |
7939 | md_cluster_ops = NULL; | |
7940 | spin_unlock(&pers_lock); | |
7941 | return 0; | |
7942 | } | |
7943 | EXPORT_SYMBOL(unregister_md_cluster_operations); | |
7944 | ||
7945 | int md_setup_cluster(struct mddev *mddev, int nodes) | |
7946 | { | |
47a7b0d8 GJ |
7947 | if (!md_cluster_ops) |
7948 | request_module("md-cluster"); | |
edb39c9d | 7949 | spin_lock(&pers_lock); |
47a7b0d8 | 7950 | /* ensure module won't be unloaded */ |
edb39c9d | 7951 | if (!md_cluster_ops || !try_module_get(md_cluster_mod)) { |
9d48739e | 7952 | pr_warn("can't find md-cluster module or get it's reference.\n"); |
edb39c9d GR |
7953 | spin_unlock(&pers_lock); |
7954 | return -ENOENT; | |
7955 | } | |
7956 | spin_unlock(&pers_lock); | |
7957 | ||
cf921cc1 | 7958 | return md_cluster_ops->join(mddev, nodes); |
edb39c9d GR |
7959 | } |
7960 | ||
7961 | void md_cluster_stop(struct mddev *mddev) | |
7962 | { | |
c4ce867f GR |
7963 | if (!md_cluster_ops) |
7964 | return; | |
edb39c9d GR |
7965 | md_cluster_ops->leave(mddev); |
7966 | module_put(md_cluster_mod); | |
7967 | } | |
7968 | ||
fd01b88c | 7969 | static int is_mddev_idle(struct mddev *mddev, int init) |
1da177e4 | 7970 | { |
f72ffdd6 | 7971 | struct md_rdev *rdev; |
1da177e4 | 7972 | int idle; |
eea1bf38 | 7973 | int curr_events; |
1da177e4 LT |
7974 | |
7975 | idle = 1; | |
4b80991c N |
7976 | rcu_read_lock(); |
7977 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 7978 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
7979 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
7980 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
7981 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
7982 | /* sync IO will cause sync_io to increase before the disk_stats |
7983 | * as sync_io is counted when a request starts, and | |
7984 | * disk_stats is counted when it completes. | |
7985 | * So resync activity will cause curr_events to be smaller than | |
7986 | * when there was no such activity. | |
7987 | * non-sync IO will cause disk_stat to increase without | |
7988 | * increasing sync_io so curr_events will (eventually) | |
7989 | * be larger than it was before. Once it becomes | |
7990 | * substantially larger, the test below will cause | |
7991 | * the array to appear non-idle, and resync will slow | |
7992 | * down. | |
7993 | * If there is a lot of outstanding resync activity when | |
7994 | * we set last_event to curr_events, then all that activity | |
7995 | * completing might cause the array to appear non-idle | |
7996 | * and resync will be slowed down even though there might | |
7997 | * not have been non-resync activity. This will only | |
7998 | * happen once though. 'last_events' will soon reflect | |
7999 | * the state where there is little or no outstanding | |
8000 | * resync requests, and further resync activity will | |
8001 | * always make curr_events less than last_events. | |
c0e48521 | 8002 | * |
1da177e4 | 8003 | */ |
eea1bf38 | 8004 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
8005 | rdev->last_events = curr_events; |
8006 | idle = 0; | |
8007 | } | |
8008 | } | |
4b80991c | 8009 | rcu_read_unlock(); |
1da177e4 LT |
8010 | return idle; |
8011 | } | |
8012 | ||
fd01b88c | 8013 | void md_done_sync(struct mddev *mddev, int blocks, int ok) |
1da177e4 LT |
8014 | { |
8015 | /* another "blocks" (512byte) blocks have been synced */ | |
8016 | atomic_sub(blocks, &mddev->recovery_active); | |
8017 | wake_up(&mddev->recovery_wait); | |
8018 | if (!ok) { | |
dfc70645 | 8019 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
0a19caab | 8020 | set_bit(MD_RECOVERY_ERROR, &mddev->recovery); |
1da177e4 LT |
8021 | md_wakeup_thread(mddev->thread); |
8022 | // stop recovery, signal do_sync .... | |
8023 | } | |
8024 | } | |
6c144d31 | 8025 | EXPORT_SYMBOL(md_done_sync); |
1da177e4 | 8026 | |
06d91a5f N |
8027 | /* md_write_start(mddev, bi) |
8028 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
8029 | * in superblock) before writing, schedule a superblock update |
8030 | * and wait for it to complete. | |
cc27b0c7 N |
8031 | * A return value of 'false' means that the write wasn't recorded |
8032 | * and cannot proceed as the array is being suspend. | |
06d91a5f | 8033 | */ |
cc27b0c7 | 8034 | bool md_write_start(struct mddev *mddev, struct bio *bi) |
1da177e4 | 8035 | { |
0fd62b86 | 8036 | int did_change = 0; |
06d91a5f | 8037 | if (bio_data_dir(bi) != WRITE) |
cc27b0c7 | 8038 | return true; |
06d91a5f | 8039 | |
f91de92e N |
8040 | BUG_ON(mddev->ro == 1); |
8041 | if (mddev->ro == 2) { | |
8042 | /* need to switch to read/write */ | |
8043 | mddev->ro = 0; | |
8044 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
8045 | md_wakeup_thread(mddev->thread); | |
25156198 | 8046 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 8047 | did_change = 1; |
f91de92e | 8048 | } |
4ad23a97 N |
8049 | rcu_read_lock(); |
8050 | percpu_ref_get(&mddev->writes_pending); | |
55cc39f3 | 8051 | smp_mb(); /* Match smp_mb in set_in_sync() */ |
31a59e34 N |
8052 | if (mddev->safemode == 1) |
8053 | mddev->safemode = 0; | |
4ad23a97 | 8054 | /* sync_checkers is always 0 when writes_pending is in per-cpu mode */ |
81fe48e9 | 8055 | if (mddev->in_sync || mddev->sync_checkers) { |
85572d7c | 8056 | spin_lock(&mddev->lock); |
3d310eb7 N |
8057 | if (mddev->in_sync) { |
8058 | mddev->in_sync = 0; | |
2953079c SL |
8059 | set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); |
8060 | set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); | |
3d310eb7 | 8061 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 8062 | did_change = 1; |
3d310eb7 | 8063 | } |
85572d7c | 8064 | spin_unlock(&mddev->lock); |
06d91a5f | 8065 | } |
4ad23a97 | 8066 | rcu_read_unlock(); |
0fd62b86 | 8067 | if (did_change) |
00bcb4ac | 8068 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 8069 | wait_event(mddev->sb_wait, |
d47c8ad2 N |
8070 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) || |
8071 | mddev->suspended); | |
cc27b0c7 N |
8072 | if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { |
8073 | percpu_ref_put(&mddev->writes_pending); | |
8074 | return false; | |
8075 | } | |
8076 | return true; | |
1da177e4 | 8077 | } |
6c144d31 | 8078 | EXPORT_SYMBOL(md_write_start); |
1da177e4 | 8079 | |
49728050 N |
8080 | /* md_write_inc can only be called when md_write_start() has |
8081 | * already been called at least once of the current request. | |
8082 | * It increments the counter and is useful when a single request | |
8083 | * is split into several parts. Each part causes an increment and | |
8084 | * so needs a matching md_write_end(). | |
8085 | * Unlike md_write_start(), it is safe to call md_write_inc() inside | |
8086 | * a spinlocked region. | |
8087 | */ | |
8088 | void md_write_inc(struct mddev *mddev, struct bio *bi) | |
8089 | { | |
8090 | if (bio_data_dir(bi) != WRITE) | |
8091 | return; | |
8092 | WARN_ON_ONCE(mddev->in_sync || mddev->ro); | |
4ad23a97 | 8093 | percpu_ref_get(&mddev->writes_pending); |
49728050 N |
8094 | } |
8095 | EXPORT_SYMBOL(md_write_inc); | |
8096 | ||
fd01b88c | 8097 | void md_write_end(struct mddev *mddev) |
1da177e4 | 8098 | { |
4ad23a97 N |
8099 | percpu_ref_put(&mddev->writes_pending); |
8100 | ||
8101 | if (mddev->safemode == 2) | |
8102 | md_wakeup_thread(mddev->thread); | |
8103 | else if (mddev->safemode_delay) | |
8104 | /* The roundup() ensures this only performs locking once | |
8105 | * every ->safemode_delay jiffies | |
8106 | */ | |
8107 | mod_timer(&mddev->safemode_timer, | |
8108 | roundup(jiffies, mddev->safemode_delay) + | |
8109 | mddev->safemode_delay); | |
1da177e4 | 8110 | } |
4ad23a97 | 8111 | |
6c144d31 | 8112 | EXPORT_SYMBOL(md_write_end); |
1da177e4 | 8113 | |
2a2275d6 N |
8114 | /* md_allow_write(mddev) |
8115 | * Calling this ensures that the array is marked 'active' so that writes | |
8116 | * may proceed without blocking. It is important to call this before | |
8117 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
8118 | * Must be called with mddev_lock held. | |
8119 | */ | |
2214c260 | 8120 | void md_allow_write(struct mddev *mddev) |
2a2275d6 N |
8121 | { |
8122 | if (!mddev->pers) | |
2214c260 | 8123 | return; |
2a2275d6 | 8124 | if (mddev->ro) |
2214c260 | 8125 | return; |
1a0fd497 | 8126 | if (!mddev->pers->sync_request) |
2214c260 | 8127 | return; |
2a2275d6 | 8128 | |
85572d7c | 8129 | spin_lock(&mddev->lock); |
2a2275d6 N |
8130 | if (mddev->in_sync) { |
8131 | mddev->in_sync = 0; | |
2953079c SL |
8132 | set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); |
8133 | set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); | |
2a2275d6 N |
8134 | if (mddev->safemode_delay && |
8135 | mddev->safemode == 0) | |
8136 | mddev->safemode = 1; | |
85572d7c | 8137 | spin_unlock(&mddev->lock); |
2a2275d6 | 8138 | md_update_sb(mddev, 0); |
00bcb4ac | 8139 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2214c260 AP |
8140 | /* wait for the dirty state to be recorded in the metadata */ |
8141 | wait_event(mddev->sb_wait, | |
8142 | !test_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags) && | |
8143 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); | |
2a2275d6 | 8144 | } else |
85572d7c | 8145 | spin_unlock(&mddev->lock); |
2a2275d6 N |
8146 | } |
8147 | EXPORT_SYMBOL_GPL(md_allow_write); | |
8148 | ||
1da177e4 LT |
8149 | #define SYNC_MARKS 10 |
8150 | #define SYNC_MARK_STEP (3*HZ) | |
54f89341 | 8151 | #define UPDATE_FREQUENCY (5*60*HZ) |
4ed8731d | 8152 | void md_do_sync(struct md_thread *thread) |
1da177e4 | 8153 | { |
4ed8731d | 8154 | struct mddev *mddev = thread->mddev; |
fd01b88c | 8155 | struct mddev *mddev2; |
1da177e4 LT |
8156 | unsigned int currspeed = 0, |
8157 | window; | |
ac7e50a3 | 8158 | sector_t max_sectors,j, io_sectors, recovery_done; |
1da177e4 | 8159 | unsigned long mark[SYNC_MARKS]; |
54f89341 | 8160 | unsigned long update_time; |
1da177e4 LT |
8161 | sector_t mark_cnt[SYNC_MARKS]; |
8162 | int last_mark,m; | |
8163 | struct list_head *tmp; | |
8164 | sector_t last_check; | |
57afd89f | 8165 | int skipped = 0; |
3cb03002 | 8166 | struct md_rdev *rdev; |
c4a39551 | 8167 | char *desc, *action = NULL; |
7c2c57c9 | 8168 | struct blk_plug plug; |
41a9a0dc | 8169 | int ret; |
1da177e4 LT |
8170 | |
8171 | /* just incase thread restarts... */ | |
8172 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
8173 | return; | |
3991b31e N |
8174 | if (mddev->ro) {/* never try to sync a read-only array */ |
8175 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5fd6c1dc | 8176 | return; |
3991b31e | 8177 | } |
1da177e4 | 8178 | |
41a9a0dc GJ |
8179 | if (mddev_is_clustered(mddev)) { |
8180 | ret = md_cluster_ops->resync_start(mddev); | |
8181 | if (ret) | |
8182 | goto skip; | |
8183 | ||
bb8bf15b | 8184 | set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags); |
41a9a0dc GJ |
8185 | if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
8186 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) || | |
8187 | test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) | |
8188 | && ((unsigned long long)mddev->curr_resync_completed | |
8189 | < (unsigned long long)mddev->resync_max_sectors)) | |
8190 | goto skip; | |
8191 | } | |
8192 | ||
61df9d91 | 8193 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
c4a39551 | 8194 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { |
61df9d91 | 8195 | desc = "data-check"; |
c4a39551 JB |
8196 | action = "check"; |
8197 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
61df9d91 | 8198 | desc = "requested-resync"; |
c4a39551 JB |
8199 | action = "repair"; |
8200 | } else | |
61df9d91 N |
8201 | desc = "resync"; |
8202 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
8203 | desc = "reshape"; | |
8204 | else | |
8205 | desc = "recovery"; | |
8206 | ||
c4a39551 JB |
8207 | mddev->last_sync_action = action ?: desc; |
8208 | ||
1da177e4 LT |
8209 | /* we overload curr_resync somewhat here. |
8210 | * 0 == not engaged in resync at all | |
8211 | * 2 == checking that there is no conflict with another sync | |
8212 | * 1 == like 2, but have yielded to allow conflicting resync to | |
8213 | * commense | |
8214 | * other == active in resync - this many blocks | |
8215 | * | |
8216 | * Before starting a resync we must have set curr_resync to | |
8217 | * 2, and then checked that every "conflicting" array has curr_resync | |
8218 | * less than ours. When we find one that is the same or higher | |
8219 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
8220 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
8221 | * This will mean we have to start checking from the beginning again. | |
8222 | * | |
8223 | */ | |
8224 | ||
8225 | do { | |
c622ca54 | 8226 | int mddev2_minor = -1; |
1da177e4 LT |
8227 | mddev->curr_resync = 2; |
8228 | ||
8229 | try_again: | |
404e4b43 | 8230 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 | 8231 | goto skip; |
29ac4aa3 | 8232 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
8233 | if (mddev2 == mddev) |
8234 | continue; | |
90b08710 BS |
8235 | if (!mddev->parallel_resync |
8236 | && mddev2->curr_resync | |
8237 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
8238 | DEFINE_WAIT(wq); |
8239 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
8240 | /* arbitrarily yield */ | |
8241 | mddev->curr_resync = 1; | |
8242 | wake_up(&resync_wait); | |
8243 | } | |
8244 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
8245 | /* no need to wait here, we can wait the next | |
8246 | * time 'round when curr_resync == 2 | |
8247 | */ | |
8248 | continue; | |
9744197c N |
8249 | /* We need to wait 'interruptible' so as not to |
8250 | * contribute to the load average, and not to | |
8251 | * be caught by 'softlockup' | |
8252 | */ | |
8253 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
c91abf5a | 8254 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
8712e553 | 8255 | mddev2->curr_resync >= mddev->curr_resync) { |
c622ca54 AP |
8256 | if (mddev2_minor != mddev2->md_minor) { |
8257 | mddev2_minor = mddev2->md_minor; | |
9d48739e N |
8258 | pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n", |
8259 | desc, mdname(mddev), | |
8260 | mdname(mddev2)); | |
c622ca54 | 8261 | } |
1da177e4 | 8262 | mddev_put(mddev2); |
9744197c N |
8263 | if (signal_pending(current)) |
8264 | flush_signals(current); | |
1da177e4 LT |
8265 | schedule(); |
8266 | finish_wait(&resync_wait, &wq); | |
8267 | goto try_again; | |
8268 | } | |
8269 | finish_wait(&resync_wait, &wq); | |
8270 | } | |
8271 | } | |
8272 | } while (mddev->curr_resync < 2); | |
8273 | ||
5fd6c1dc | 8274 | j = 0; |
9d88883e | 8275 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 8276 | /* resync follows the size requested by the personality, |
57afd89f | 8277 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
8278 | */ |
8279 | max_sectors = mddev->resync_max_sectors; | |
7f7583d4 | 8280 | atomic64_set(&mddev->resync_mismatches, 0); |
5fd6c1dc | 8281 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
8282 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
8283 | j = mddev->resync_min; | |
8284 | else if (!mddev->bitmap) | |
5fd6c1dc | 8285 | j = mddev->recovery_cp; |
5e96ee65 | 8286 | |
ccfcc3c1 | 8287 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
c804cdec | 8288 | max_sectors = mddev->resync_max_sectors; |
5fd6c1dc | 8289 | else { |
1da177e4 | 8290 | /* recovery follows the physical size of devices */ |
58c0fed4 | 8291 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 8292 | j = MaxSector; |
4e59ca7d | 8293 | rcu_read_lock(); |
dafb20fa | 8294 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc | 8295 | if (rdev->raid_disk >= 0 && |
f2076e7d | 8296 | !test_bit(Journal, &rdev->flags) && |
5fd6c1dc N |
8297 | !test_bit(Faulty, &rdev->flags) && |
8298 | !test_bit(In_sync, &rdev->flags) && | |
8299 | rdev->recovery_offset < j) | |
8300 | j = rdev->recovery_offset; | |
4e59ca7d | 8301 | rcu_read_unlock(); |
133d4527 N |
8302 | |
8303 | /* If there is a bitmap, we need to make sure all | |
8304 | * writes that started before we added a spare | |
8305 | * complete before we start doing a recovery. | |
8306 | * Otherwise the write might complete and (via | |
8307 | * bitmap_endwrite) set a bit in the bitmap after the | |
8308 | * recovery has checked that bit and skipped that | |
8309 | * region. | |
8310 | */ | |
8311 | if (mddev->bitmap) { | |
8312 | mddev->pers->quiesce(mddev, 1); | |
8313 | mddev->pers->quiesce(mddev, 0); | |
8314 | } | |
5fd6c1dc | 8315 | } |
1da177e4 | 8316 | |
9d48739e N |
8317 | pr_info("md: %s of RAID array %s\n", desc, mdname(mddev)); |
8318 | pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev)); | |
8319 | pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n", | |
8320 | speed_max(mddev), desc); | |
1da177e4 | 8321 | |
eea1bf38 | 8322 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 8323 | |
57afd89f | 8324 | io_sectors = 0; |
1da177e4 LT |
8325 | for (m = 0; m < SYNC_MARKS; m++) { |
8326 | mark[m] = jiffies; | |
57afd89f | 8327 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
8328 | } |
8329 | last_mark = 0; | |
8330 | mddev->resync_mark = mark[last_mark]; | |
8331 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
8332 | ||
8333 | /* | |
8334 | * Tune reconstruction: | |
8335 | */ | |
8336 | window = 32*(PAGE_SIZE/512); | |
9d48739e N |
8337 | pr_debug("md: using %dk window, over a total of %lluk.\n", |
8338 | window/2, (unsigned long long)max_sectors/2); | |
1da177e4 LT |
8339 | |
8340 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
8341 | last_check = 0; |
8342 | ||
8343 | if (j>2) { | |
9d48739e N |
8344 | pr_debug("md: resuming %s of %s from checkpoint.\n", |
8345 | desc, mdname(mddev)); | |
1da177e4 | 8346 | mddev->curr_resync = j; |
72f36d59 N |
8347 | } else |
8348 | mddev->curr_resync = 3; /* no longer delayed */ | |
75d3da43 | 8349 | mddev->curr_resync_completed = j; |
72f36d59 N |
8350 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
8351 | md_new_event(mddev); | |
54f89341 | 8352 | update_time = jiffies; |
1da177e4 | 8353 | |
7c2c57c9 | 8354 | blk_start_plug(&plug); |
1da177e4 | 8355 | while (j < max_sectors) { |
57afd89f | 8356 | sector_t sectors; |
1da177e4 | 8357 | |
57afd89f | 8358 | skipped = 0; |
97e4f42d | 8359 | |
7a91ee1f N |
8360 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
8361 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
8362 | (mddev->curr_resync - mddev->curr_resync_completed) | |
8363 | > (max_sectors >> 4)) || | |
54f89341 | 8364 | time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) || |
7a91ee1f | 8365 | (j - mddev->curr_resync_completed)*2 |
c5e19d90 N |
8366 | >= mddev->resync_max - mddev->curr_resync_completed || |
8367 | mddev->curr_resync_completed > mddev->resync_max | |
7a91ee1f | 8368 | )) { |
97e4f42d | 8369 | /* time to update curr_resync_completed */ |
97e4f42d N |
8370 | wait_event(mddev->recovery_wait, |
8371 | atomic_read(&mddev->recovery_active) == 0); | |
75d3da43 | 8372 | mddev->curr_resync_completed = j; |
35d78c66 | 8373 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && |
8374 | j > mddev->recovery_cp) | |
8375 | mddev->recovery_cp = j; | |
54f89341 | 8376 | update_time = jiffies; |
2953079c | 8377 | set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); |
acb180b0 | 8378 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 8379 | } |
acb180b0 | 8380 | |
c91abf5a N |
8381 | while (j >= mddev->resync_max && |
8382 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
e62e58a5 N |
8383 | /* As this condition is controlled by user-space, |
8384 | * we can block indefinitely, so use '_interruptible' | |
8385 | * to avoid triggering warnings. | |
8386 | */ | |
8387 | flush_signals(current); /* just in case */ | |
8388 | wait_event_interruptible(mddev->recovery_wait, | |
8389 | mddev->resync_max > j | |
c91abf5a N |
8390 | || test_bit(MD_RECOVERY_INTR, |
8391 | &mddev->recovery)); | |
e62e58a5 | 8392 | } |
acb180b0 | 8393 | |
c91abf5a N |
8394 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
8395 | break; | |
acb180b0 | 8396 | |
09314799 | 8397 | sectors = mddev->pers->sync_request(mddev, j, &skipped); |
57afd89f | 8398 | if (sectors == 0) { |
dfc70645 | 8399 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
c91abf5a | 8400 | break; |
1da177e4 | 8401 | } |
57afd89f N |
8402 | |
8403 | if (!skipped) { /* actual IO requested */ | |
8404 | io_sectors += sectors; | |
8405 | atomic_add(sectors, &mddev->recovery_active); | |
8406 | } | |
8407 | ||
e875ecea N |
8408 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
8409 | break; | |
8410 | ||
1da177e4 | 8411 | j += sectors; |
5ed1df2e N |
8412 | if (j > max_sectors) |
8413 | /* when skipping, extra large numbers can be returned. */ | |
8414 | j = max_sectors; | |
72f36d59 N |
8415 | if (j > 2) |
8416 | mddev->curr_resync = j; | |
ff4e8d9a | 8417 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e | 8418 | if (last_check == 0) |
e875ecea | 8419 | /* this is the earliest that rebuild will be |
d7603b7e N |
8420 | * visible in /proc/mdstat |
8421 | */ | |
8422 | md_new_event(mddev); | |
57afd89f N |
8423 | |
8424 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
8425 | continue; |
8426 | ||
57afd89f | 8427 | last_check = io_sectors; |
1da177e4 LT |
8428 | repeat: |
8429 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
8430 | /* step marks */ | |
8431 | int next = (last_mark+1) % SYNC_MARKS; | |
8432 | ||
8433 | mddev->resync_mark = mark[next]; | |
8434 | mddev->resync_mark_cnt = mark_cnt[next]; | |
8435 | mark[next] = jiffies; | |
57afd89f | 8436 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
8437 | last_mark = next; |
8438 | } | |
8439 | ||
c91abf5a N |
8440 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
8441 | break; | |
1da177e4 LT |
8442 | |
8443 | /* | |
8444 | * this loop exits only if either when we are slower than | |
8445 | * the 'hard' speed limit, or the system was IO-idle for | |
8446 | * a jiffy. | |
8447 | * the system might be non-idle CPU-wise, but we only care | |
8448 | * about not overloading the IO subsystem. (things like an | |
8449 | * e2fsck being done on the RAID array should execute fast) | |
8450 | */ | |
1da177e4 LT |
8451 | cond_resched(); |
8452 | ||
ac7e50a3 XN |
8453 | recovery_done = io_sectors - atomic_read(&mddev->recovery_active); |
8454 | currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2 | |
57afd89f | 8455 | /((jiffies-mddev->resync_mark)/HZ +1) +1; |
1da177e4 | 8456 | |
88202a0c | 8457 | if (currspeed > speed_min(mddev)) { |
ac8fa419 | 8458 | if (currspeed > speed_max(mddev)) { |
c0e48521 | 8459 | msleep(500); |
1da177e4 LT |
8460 | goto repeat; |
8461 | } | |
ac8fa419 N |
8462 | if (!is_mddev_idle(mddev, 0)) { |
8463 | /* | |
8464 | * Give other IO more of a chance. | |
8465 | * The faster the devices, the less we wait. | |
8466 | */ | |
8467 | wait_event(mddev->recovery_wait, | |
8468 | !atomic_read(&mddev->recovery_active)); | |
8469 | } | |
1da177e4 LT |
8470 | } |
8471 | } | |
9d48739e N |
8472 | pr_info("md: %s: %s %s.\n",mdname(mddev), desc, |
8473 | test_bit(MD_RECOVERY_INTR, &mddev->recovery) | |
8474 | ? "interrupted" : "done"); | |
1da177e4 LT |
8475 | /* |
8476 | * this also signals 'finished resyncing' to md_stop | |
8477 | */ | |
7c2c57c9 | 8478 | blk_finish_plug(&plug); |
1da177e4 LT |
8479 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
8480 | ||
5ed1df2e N |
8481 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
8482 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
1217e1d1 | 8483 | mddev->curr_resync > 3) { |
5ed1df2e N |
8484 | mddev->curr_resync_completed = mddev->curr_resync; |
8485 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
8486 | } | |
09314799 | 8487 | mddev->pers->sync_request(mddev, max_sectors, &skipped); |
1da177e4 | 8488 | |
dfc70645 | 8489 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
1217e1d1 | 8490 | mddev->curr_resync > 3) { |
5fd6c1dc N |
8491 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
8492 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
8493 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
9d48739e N |
8494 | pr_debug("md: checkpointing %s of %s.\n", |
8495 | desc, mdname(mddev)); | |
0a19caab | 8496 | if (test_bit(MD_RECOVERY_ERROR, |
8497 | &mddev->recovery)) | |
8498 | mddev->recovery_cp = | |
8499 | mddev->curr_resync_completed; | |
8500 | else | |
8501 | mddev->recovery_cp = | |
8502 | mddev->curr_resync; | |
5fd6c1dc N |
8503 | } |
8504 | } else | |
8505 | mddev->recovery_cp = MaxSector; | |
8506 | } else { | |
8507 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
8508 | mddev->curr_resync = MaxSector; | |
4e59ca7d | 8509 | rcu_read_lock(); |
dafb20fa | 8510 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc | 8511 | if (rdev->raid_disk >= 0 && |
70fffd0b | 8512 | mddev->delta_disks >= 0 && |
f2076e7d | 8513 | !test_bit(Journal, &rdev->flags) && |
5fd6c1dc N |
8514 | !test_bit(Faulty, &rdev->flags) && |
8515 | !test_bit(In_sync, &rdev->flags) && | |
8516 | rdev->recovery_offset < mddev->curr_resync) | |
8517 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 8518 | rcu_read_unlock(); |
5fd6c1dc | 8519 | } |
1da177e4 | 8520 | } |
db91ff55 | 8521 | skip: |
bb8bf15b GJ |
8522 | /* set CHANGE_PENDING here since maybe another update is needed, |
8523 | * so other nodes are informed. It should be harmless for normal | |
8524 | * raid */ | |
2953079c SL |
8525 | set_mask_bits(&mddev->sb_flags, 0, |
8526 | BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS)); | |
c186b128 | 8527 | |
23da422b | 8528 | spin_lock(&mddev->lock); |
c07b70ad N |
8529 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
8530 | /* We completed so min/max setting can be forgotten if used. */ | |
8531 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
8532 | mddev->resync_min = 0; | |
8533 | mddev->resync_max = MaxSector; | |
8534 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
8535 | mddev->resync_min = mddev->curr_resync_completed; | |
f7851be7 | 8536 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); |
1da177e4 | 8537 | mddev->curr_resync = 0; |
23da422b N |
8538 | spin_unlock(&mddev->lock); |
8539 | ||
1da177e4 | 8540 | wake_up(&resync_wait); |
1da177e4 | 8541 | md_wakeup_thread(mddev->thread); |
c6207277 | 8542 | return; |
1da177e4 | 8543 | } |
29269553 | 8544 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 | 8545 | |
746d3207 N |
8546 | static int remove_and_add_spares(struct mddev *mddev, |
8547 | struct md_rdev *this) | |
b4c4c7b8 | 8548 | { |
3cb03002 | 8549 | struct md_rdev *rdev; |
b4c4c7b8 | 8550 | int spares = 0; |
f2a371c5 | 8551 | int removed = 0; |
d787be40 | 8552 | bool remove_some = false; |
b4c4c7b8 | 8553 | |
d787be40 N |
8554 | rdev_for_each(rdev, mddev) { |
8555 | if ((this == NULL || rdev == this) && | |
8556 | rdev->raid_disk >= 0 && | |
8557 | !test_bit(Blocked, &rdev->flags) && | |
8558 | test_bit(Faulty, &rdev->flags) && | |
8559 | atomic_read(&rdev->nr_pending)==0) { | |
8560 | /* Faulty non-Blocked devices with nr_pending == 0 | |
8561 | * never get nr_pending incremented, | |
8562 | * never get Faulty cleared, and never get Blocked set. | |
8563 | * So we can synchronize_rcu now rather than once per device | |
8564 | */ | |
8565 | remove_some = true; | |
8566 | set_bit(RemoveSynchronized, &rdev->flags); | |
8567 | } | |
8568 | } | |
8569 | ||
8570 | if (remove_some) | |
8571 | synchronize_rcu(); | |
8572 | rdev_for_each(rdev, mddev) { | |
746d3207 N |
8573 | if ((this == NULL || rdev == this) && |
8574 | rdev->raid_disk >= 0 && | |
6bfe0b49 | 8575 | !test_bit(Blocked, &rdev->flags) && |
d787be40 | 8576 | ((test_bit(RemoveSynchronized, &rdev->flags) || |
f2076e7d SL |
8577 | (!test_bit(In_sync, &rdev->flags) && |
8578 | !test_bit(Journal, &rdev->flags))) && | |
d787be40 | 8579 | atomic_read(&rdev->nr_pending)==0)) { |
b4c4c7b8 | 8580 | if (mddev->pers->hot_remove_disk( |
b8321b68 | 8581 | mddev, rdev) == 0) { |
36fad858 | 8582 | sysfs_unlink_rdev(mddev, rdev); |
b4c4c7b8 | 8583 | rdev->raid_disk = -1; |
f2a371c5 | 8584 | removed++; |
b4c4c7b8 N |
8585 | } |
8586 | } | |
d787be40 N |
8587 | if (remove_some && test_bit(RemoveSynchronized, &rdev->flags)) |
8588 | clear_bit(RemoveSynchronized, &rdev->flags); | |
8589 | } | |
8590 | ||
90584fc9 JB |
8591 | if (removed && mddev->kobj.sd) |
8592 | sysfs_notify(&mddev->kobj, NULL, "degraded"); | |
b4c4c7b8 | 8593 | |
2910ff17 | 8594 | if (this && removed) |
746d3207 N |
8595 | goto no_add; |
8596 | ||
dafb20fa | 8597 | rdev_for_each(rdev, mddev) { |
2910ff17 GR |
8598 | if (this && this != rdev) |
8599 | continue; | |
dbb64f86 GR |
8600 | if (test_bit(Candidate, &rdev->flags)) |
8601 | continue; | |
7bfec5f3 N |
8602 | if (rdev->raid_disk >= 0 && |
8603 | !test_bit(In_sync, &rdev->flags) && | |
f2076e7d | 8604 | !test_bit(Journal, &rdev->flags) && |
7bfec5f3 N |
8605 | !test_bit(Faulty, &rdev->flags)) |
8606 | spares++; | |
7ceb17e8 N |
8607 | if (rdev->raid_disk >= 0) |
8608 | continue; | |
8609 | if (test_bit(Faulty, &rdev->flags)) | |
8610 | continue; | |
f6b6ec5c SL |
8611 | if (!test_bit(Journal, &rdev->flags)) { |
8612 | if (mddev->ro && | |
8613 | ! (rdev->saved_raid_disk >= 0 && | |
8614 | !test_bit(Bitmap_sync, &rdev->flags))) | |
8615 | continue; | |
7ceb17e8 | 8616 | |
f6b6ec5c SL |
8617 | rdev->recovery_offset = 0; |
8618 | } | |
7ceb17e8 N |
8619 | if (mddev->pers-> |
8620 | hot_add_disk(mddev, rdev) == 0) { | |
8621 | if (sysfs_link_rdev(mddev, rdev)) | |
8622 | /* failure here is OK */; | |
f6b6ec5c SL |
8623 | if (!test_bit(Journal, &rdev->flags)) |
8624 | spares++; | |
7ceb17e8 | 8625 | md_new_event(mddev); |
2953079c | 8626 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
dfc70645 | 8627 | } |
b4c4c7b8 | 8628 | } |
746d3207 | 8629 | no_add: |
6dafab6b | 8630 | if (removed) |
2953079c | 8631 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
b4c4c7b8 N |
8632 | return spares; |
8633 | } | |
7ebc0be7 | 8634 | |
ac05f256 N |
8635 | static void md_start_sync(struct work_struct *ws) |
8636 | { | |
8637 | struct mddev *mddev = container_of(ws, struct mddev, del_work); | |
c186b128 | 8638 | |
ac05f256 N |
8639 | mddev->sync_thread = md_register_thread(md_do_sync, |
8640 | mddev, | |
8641 | "resync"); | |
8642 | if (!mddev->sync_thread) { | |
9d48739e N |
8643 | pr_warn("%s: could not start resync thread...\n", |
8644 | mdname(mddev)); | |
ac05f256 N |
8645 | /* leave the spares where they are, it shouldn't hurt */ |
8646 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
8647 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
8648 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
8649 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
8650 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 8651 | wake_up(&resync_wait); |
ac05f256 N |
8652 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
8653 | &mddev->recovery)) | |
8654 | if (mddev->sysfs_action) | |
8655 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
8656 | } else | |
8657 | md_wakeup_thread(mddev->sync_thread); | |
8658 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
8659 | md_new_event(mddev); | |
8660 | } | |
8661 | ||
1da177e4 LT |
8662 | /* |
8663 | * This routine is regularly called by all per-raid-array threads to | |
8664 | * deal with generic issues like resync and super-block update. | |
8665 | * Raid personalities that don't have a thread (linear/raid0) do not | |
8666 | * need this as they never do any recovery or update the superblock. | |
8667 | * | |
8668 | * It does not do any resync itself, but rather "forks" off other threads | |
8669 | * to do that as needed. | |
8670 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
8671 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 8672 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
8673 | * and wakeups up this thread which will reap the thread and finish up. |
8674 | * This thread also removes any faulty devices (with nr_pending == 0). | |
8675 | * | |
8676 | * The overall approach is: | |
8677 | * 1/ if the superblock needs updating, update it. | |
8678 | * 2/ If a recovery thread is running, don't do anything else. | |
8679 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
8680 | * 4/ If there are any faulty devices, remove them. | |
8681 | * 5/ If array is degraded, try to add spares devices | |
8682 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
8683 | */ | |
fd01b88c | 8684 | void md_check_recovery(struct mddev *mddev) |
1da177e4 | 8685 | { |
68866e42 JB |
8686 | if (mddev->suspended) |
8687 | return; | |
8688 | ||
5f40402d | 8689 | if (mddev->bitmap) |
aa5cbd10 | 8690 | bitmap_daemon_work(mddev); |
1da177e4 | 8691 | |
fca4d848 | 8692 | if (signal_pending(current)) { |
31a59e34 | 8693 | if (mddev->pers->sync_request && !mddev->external) { |
9d48739e N |
8694 | pr_debug("md: %s in immediate safe mode\n", |
8695 | mdname(mddev)); | |
fca4d848 N |
8696 | mddev->safemode = 2; |
8697 | } | |
8698 | flush_signals(current); | |
8699 | } | |
8700 | ||
c89a8eee N |
8701 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
8702 | return; | |
1da177e4 | 8703 | if ( ! ( |
2953079c | 8704 | (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) || |
1da177e4 | 8705 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 8706 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 8707 | (mddev->external == 0 && mddev->safemode == 1) || |
4ad23a97 | 8708 | (mddev->safemode == 2 |
fca4d848 | 8709 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) |
1da177e4 LT |
8710 | )) |
8711 | return; | |
fca4d848 | 8712 | |
df5b89b3 | 8713 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 8714 | int spares = 0; |
fca4d848 | 8715 | |
afc1f55c | 8716 | if (!mddev->external && mddev->safemode == 1) |
33182d15 N |
8717 | mddev->safemode = 0; |
8718 | ||
c89a8eee | 8719 | if (mddev->ro) { |
ab16bfc7 NB |
8720 | struct md_rdev *rdev; |
8721 | if (!mddev->external && mddev->in_sync) | |
8722 | /* 'Blocked' flag not needed as failed devices | |
8723 | * will be recorded if array switched to read/write. | |
8724 | * Leaving it set will prevent the device | |
8725 | * from being removed. | |
8726 | */ | |
8727 | rdev_for_each(rdev, mddev) | |
8728 | clear_bit(Blocked, &rdev->flags); | |
7ceb17e8 N |
8729 | /* On a read-only array we can: |
8730 | * - remove failed devices | |
8731 | * - add already-in_sync devices if the array itself | |
8732 | * is in-sync. | |
8733 | * As we only add devices that are already in-sync, | |
8734 | * we can activate the spares immediately. | |
c89a8eee | 8735 | */ |
7ceb17e8 | 8736 | remove_and_add_spares(mddev, NULL); |
8313b8e5 N |
8737 | /* There is no thread, but we need to call |
8738 | * ->spare_active and clear saved_raid_disk | |
8739 | */ | |
2ac295a5 | 8740 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
8313b8e5 | 8741 | md_reap_sync_thread(mddev); |
a4a3d26d | 8742 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
8313b8e5 | 8743 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
2953079c | 8744 | clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); |
c89a8eee N |
8745 | goto unlock; |
8746 | } | |
8747 | ||
659b254f GJ |
8748 | if (mddev_is_clustered(mddev)) { |
8749 | struct md_rdev *rdev; | |
8750 | /* kick the device if another node issued a | |
8751 | * remove disk. | |
8752 | */ | |
8753 | rdev_for_each(rdev, mddev) { | |
8754 | if (test_and_clear_bit(ClusterRemove, &rdev->flags) && | |
8755 | rdev->raid_disk < 0) | |
8756 | md_kick_rdev_from_array(rdev); | |
8757 | } | |
8758 | } | |
8759 | ||
6497709b | 8760 | if (!mddev->external && !mddev->in_sync) { |
85572d7c | 8761 | spin_lock(&mddev->lock); |
6497709b | 8762 | set_in_sync(mddev); |
85572d7c | 8763 | spin_unlock(&mddev->lock); |
fca4d848 | 8764 | } |
fca4d848 | 8765 | |
2953079c | 8766 | if (mddev->sb_flags) |
850b2b42 | 8767 | md_update_sb(mddev, 0); |
06d91a5f | 8768 | |
1da177e4 LT |
8769 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
8770 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
8771 | /* resync/recovery still happening */ | |
8772 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
8773 | goto unlock; | |
8774 | } | |
8775 | if (mddev->sync_thread) { | |
a91d5ac0 | 8776 | md_reap_sync_thread(mddev); |
1da177e4 LT |
8777 | goto unlock; |
8778 | } | |
72a23c21 NB |
8779 | /* Set RUNNING before clearing NEEDED to avoid |
8780 | * any transients in the value of "sync_action". | |
8781 | */ | |
72f36d59 | 8782 | mddev->curr_resync_completed = 0; |
23da422b | 8783 | spin_lock(&mddev->lock); |
72a23c21 | 8784 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
23da422b | 8785 | spin_unlock(&mddev->lock); |
24dd469d N |
8786 | /* Clear some bits that don't mean anything, but |
8787 | * might be left set | |
8788 | */ | |
24dd469d N |
8789 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
8790 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 8791 | |
ed209584 N |
8792 | if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
8793 | test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
ac05f256 | 8794 | goto not_running; |
1da177e4 LT |
8795 | /* no recovery is running. |
8796 | * remove any failed drives, then | |
8797 | * add spares if possible. | |
72f36d59 | 8798 | * Spares are also removed and re-added, to allow |
1da177e4 LT |
8799 | * the personality to fail the re-add. |
8800 | */ | |
1da177e4 | 8801 | |
b4c4c7b8 | 8802 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
8803 | if (mddev->pers->check_reshape == NULL || |
8804 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 | 8805 | /* Cannot proceed */ |
ac05f256 | 8806 | goto not_running; |
b4c4c7b8 | 8807 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
72a23c21 | 8808 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
746d3207 | 8809 | } else if ((spares = remove_and_add_spares(mddev, NULL))) { |
24dd469d N |
8810 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
8811 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 8812 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 8813 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
8814 | } else if (mddev->recovery_cp < MaxSector) { |
8815 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 8816 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
8817 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
8818 | /* nothing to be done ... */ | |
ac05f256 | 8819 | goto not_running; |
24dd469d | 8820 | |
1da177e4 | 8821 | if (mddev->pers->sync_request) { |
ef99bf48 | 8822 | if (spares) { |
a654b9d8 N |
8823 | /* We are adding a device or devices to an array |
8824 | * which has the bitmap stored on all devices. | |
8825 | * So make sure all bitmap pages get written | |
8826 | */ | |
8827 | bitmap_write_all(mddev->bitmap); | |
8828 | } | |
ac05f256 N |
8829 | INIT_WORK(&mddev->del_work, md_start_sync); |
8830 | queue_work(md_misc_wq, &mddev->del_work); | |
8831 | goto unlock; | |
1da177e4 | 8832 | } |
ac05f256 | 8833 | not_running: |
72a23c21 NB |
8834 | if (!mddev->sync_thread) { |
8835 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 8836 | wake_up(&resync_wait); |
72a23c21 NB |
8837 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
8838 | &mddev->recovery)) | |
0c3573f1 | 8839 | if (mddev->sysfs_action) |
00bcb4ac | 8840 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 8841 | } |
ac05f256 N |
8842 | unlock: |
8843 | wake_up(&mddev->sb_wait); | |
1da177e4 | 8844 | mddev_unlock(mddev); |
35bfc521 N |
8845 | } else if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) { |
8846 | /* Write superblock - thread that called mddev_suspend() | |
8847 | * holds reconfig_mutex for us. | |
8848 | */ | |
8849 | set_bit(MD_UPDATING_SB, &mddev->flags); | |
8850 | smp_mb__after_atomic(); | |
8851 | if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags)) | |
8852 | md_update_sb(mddev, 0); | |
8853 | clear_bit_unlock(MD_UPDATING_SB, &mddev->flags); | |
8854 | wake_up(&mddev->sb_wait); | |
1da177e4 LT |
8855 | } |
8856 | } | |
6c144d31 | 8857 | EXPORT_SYMBOL(md_check_recovery); |
1da177e4 | 8858 | |
a91d5ac0 JB |
8859 | void md_reap_sync_thread(struct mddev *mddev) |
8860 | { | |
8861 | struct md_rdev *rdev; | |
8862 | ||
8863 | /* resync has finished, collect result */ | |
8864 | md_unregister_thread(&mddev->sync_thread); | |
8865 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
8866 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
8867 | /* success...*/ | |
8868 | /* activate any spares */ | |
8869 | if (mddev->pers->spare_active(mddev)) { | |
8870 | sysfs_notify(&mddev->kobj, NULL, | |
8871 | "degraded"); | |
2953079c | 8872 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
a91d5ac0 JB |
8873 | } |
8874 | } | |
8875 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
8876 | mddev->pers->finish_reshape) | |
8877 | mddev->pers->finish_reshape(mddev); | |
8878 | ||
8879 | /* If array is no-longer degraded, then any saved_raid_disk | |
f466722c | 8880 | * information must be scrapped. |
a91d5ac0 | 8881 | */ |
f466722c N |
8882 | if (!mddev->degraded) |
8883 | rdev_for_each(rdev, mddev) | |
a91d5ac0 JB |
8884 | rdev->saved_raid_disk = -1; |
8885 | ||
8886 | md_update_sb(mddev, 1); | |
2953079c | 8887 | /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can |
bb8bf15b GJ |
8888 | * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by |
8889 | * clustered raid */ | |
8890 | if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags)) | |
8891 | md_cluster_ops->resync_finish(mddev); | |
a91d5ac0 | 8892 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
ea358cd0 | 8893 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); |
a91d5ac0 JB |
8894 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
8895 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
8896 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
8897 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
f851b60d | 8898 | wake_up(&resync_wait); |
a91d5ac0 JB |
8899 | /* flag recovery needed just to double check */ |
8900 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
8901 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
8902 | md_new_event(mddev); | |
8903 | if (mddev->event_work.func) | |
8904 | queue_work(md_misc_wq, &mddev->event_work); | |
8905 | } | |
6c144d31 | 8906 | EXPORT_SYMBOL(md_reap_sync_thread); |
a91d5ac0 | 8907 | |
fd01b88c | 8908 | void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) |
6bfe0b49 | 8909 | { |
00bcb4ac | 8910 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 | 8911 | wait_event_timeout(rdev->blocked_wait, |
de393cde N |
8912 | !test_bit(Blocked, &rdev->flags) && |
8913 | !test_bit(BlockedBadBlocks, &rdev->flags), | |
6bfe0b49 DW |
8914 | msecs_to_jiffies(5000)); |
8915 | rdev_dec_pending(rdev, mddev); | |
8916 | } | |
8917 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
8918 | ||
c6563a8c N |
8919 | void md_finish_reshape(struct mddev *mddev) |
8920 | { | |
8921 | /* called be personality module when reshape completes. */ | |
8922 | struct md_rdev *rdev; | |
8923 | ||
8924 | rdev_for_each(rdev, mddev) { | |
8925 | if (rdev->data_offset > rdev->new_data_offset) | |
8926 | rdev->sectors += rdev->data_offset - rdev->new_data_offset; | |
8927 | else | |
8928 | rdev->sectors -= rdev->new_data_offset - rdev->data_offset; | |
8929 | rdev->data_offset = rdev->new_data_offset; | |
8930 | } | |
8931 | } | |
8932 | EXPORT_SYMBOL(md_finish_reshape); | |
2230dfe4 | 8933 | |
fc974ee2 | 8934 | /* Bad block management */ |
2230dfe4 | 8935 | |
fc974ee2 | 8936 | /* Returns 1 on success, 0 on failure */ |
3cb03002 | 8937 | int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
c6563a8c | 8938 | int is_new) |
2230dfe4 | 8939 | { |
85ad1d13 | 8940 | struct mddev *mddev = rdev->mddev; |
c6563a8c N |
8941 | int rv; |
8942 | if (is_new) | |
8943 | s += rdev->new_data_offset; | |
8944 | else | |
8945 | s += rdev->data_offset; | |
fc974ee2 VV |
8946 | rv = badblocks_set(&rdev->badblocks, s, sectors, 0); |
8947 | if (rv == 0) { | |
2230dfe4 | 8948 | /* Make sure they get written out promptly */ |
35b785f7 TM |
8949 | if (test_bit(ExternalBbl, &rdev->flags)) |
8950 | sysfs_notify(&rdev->kobj, NULL, | |
8951 | "unacknowledged_bad_blocks"); | |
8bd2f0a0 | 8952 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
2953079c SL |
8953 | set_mask_bits(&mddev->sb_flags, 0, |
8954 | BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING)); | |
2230dfe4 | 8955 | md_wakeup_thread(rdev->mddev->thread); |
fc974ee2 VV |
8956 | return 1; |
8957 | } else | |
8958 | return 0; | |
2230dfe4 N |
8959 | } |
8960 | EXPORT_SYMBOL_GPL(rdev_set_badblocks); | |
8961 | ||
c6563a8c N |
8962 | int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
8963 | int is_new) | |
2230dfe4 | 8964 | { |
35b785f7 | 8965 | int rv; |
c6563a8c N |
8966 | if (is_new) |
8967 | s += rdev->new_data_offset; | |
8968 | else | |
8969 | s += rdev->data_offset; | |
35b785f7 TM |
8970 | rv = badblocks_clear(&rdev->badblocks, s, sectors); |
8971 | if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags)) | |
8972 | sysfs_notify(&rdev->kobj, NULL, "bad_blocks"); | |
8973 | return rv; | |
2230dfe4 N |
8974 | } |
8975 | EXPORT_SYMBOL_GPL(rdev_clear_badblocks); | |
8976 | ||
75c96f85 AB |
8977 | static int md_notify_reboot(struct notifier_block *this, |
8978 | unsigned long code, void *x) | |
1da177e4 LT |
8979 | { |
8980 | struct list_head *tmp; | |
fd01b88c | 8981 | struct mddev *mddev; |
2dba6a91 | 8982 | int need_delay = 0; |
1da177e4 | 8983 | |
c744a65c N |
8984 | for_each_mddev(mddev, tmp) { |
8985 | if (mddev_trylock(mddev)) { | |
30b8aa91 N |
8986 | if (mddev->pers) |
8987 | __md_stop_writes(mddev); | |
0f62fb22 N |
8988 | if (mddev->persistent) |
8989 | mddev->safemode = 2; | |
c744a65c | 8990 | mddev_unlock(mddev); |
2dba6a91 | 8991 | } |
c744a65c | 8992 | need_delay = 1; |
1da177e4 | 8993 | } |
c744a65c N |
8994 | /* |
8995 | * certain more exotic SCSI devices are known to be | |
8996 | * volatile wrt too early system reboots. While the | |
8997 | * right place to handle this issue is the given | |
8998 | * driver, we do want to have a safe RAID driver ... | |
8999 | */ | |
9000 | if (need_delay) | |
9001 | mdelay(1000*1); | |
9002 | ||
1da177e4 LT |
9003 | return NOTIFY_DONE; |
9004 | } | |
9005 | ||
75c96f85 | 9006 | static struct notifier_block md_notifier = { |
1da177e4 LT |
9007 | .notifier_call = md_notify_reboot, |
9008 | .next = NULL, | |
9009 | .priority = INT_MAX, /* before any real devices */ | |
9010 | }; | |
9011 | ||
9012 | static void md_geninit(void) | |
9013 | { | |
36a4e1fe | 9014 | pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
1da177e4 | 9015 | |
c7705f34 | 9016 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
9017 | } |
9018 | ||
75c96f85 | 9019 | static int __init md_init(void) |
1da177e4 | 9020 | { |
e804ac78 TH |
9021 | int ret = -ENOMEM; |
9022 | ||
ada609ee | 9023 | md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
e804ac78 TH |
9024 | if (!md_wq) |
9025 | goto err_wq; | |
9026 | ||
9027 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
9028 | if (!md_misc_wq) | |
9029 | goto err_misc_wq; | |
9030 | ||
9031 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
9032 | goto err_md; | |
9033 | ||
9034 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
9035 | goto err_mdp; | |
9036 | mdp_major = ret; | |
9037 | ||
af5628f0 | 9038 | blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE, |
e8703fe1 N |
9039 | md_probe, NULL, NULL); |
9040 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
9041 | md_probe, NULL, NULL); |
9042 | ||
1da177e4 | 9043 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 9044 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
9045 | |
9046 | md_geninit(); | |
d710e138 | 9047 | return 0; |
1da177e4 | 9048 | |
e804ac78 TH |
9049 | err_mdp: |
9050 | unregister_blkdev(MD_MAJOR, "md"); | |
9051 | err_md: | |
9052 | destroy_workqueue(md_misc_wq); | |
9053 | err_misc_wq: | |
9054 | destroy_workqueue(md_wq); | |
9055 | err_wq: | |
9056 | return ret; | |
9057 | } | |
1da177e4 | 9058 | |
70bcecdb | 9059 | static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev) |
1d7e3e96 | 9060 | { |
70bcecdb GR |
9061 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
9062 | struct md_rdev *rdev2; | |
9063 | int role, ret; | |
9064 | char b[BDEVNAME_SIZE]; | |
1d7e3e96 | 9065 | |
818da59f GJ |
9066 | /* |
9067 | * If size is changed in another node then we need to | |
9068 | * do resize as well. | |
9069 | */ | |
9070 | if (mddev->dev_sectors != le64_to_cpu(sb->size)) { | |
9071 | ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size)); | |
9072 | if (ret) | |
9073 | pr_info("md-cluster: resize failed\n"); | |
9074 | else | |
9075 | bitmap_update_sb(mddev->bitmap); | |
9076 | } | |
9077 | ||
70bcecdb GR |
9078 | /* Check for change of roles in the active devices */ |
9079 | rdev_for_each(rdev2, mddev) { | |
9080 | if (test_bit(Faulty, &rdev2->flags)) | |
9081 | continue; | |
9082 | ||
9083 | /* Check if the roles changed */ | |
9084 | role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]); | |
dbb64f86 GR |
9085 | |
9086 | if (test_bit(Candidate, &rdev2->flags)) { | |
9087 | if (role == 0xfffe) { | |
9088 | pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b)); | |
9089 | md_kick_rdev_from_array(rdev2); | |
9090 | continue; | |
9091 | } | |
9092 | else | |
9093 | clear_bit(Candidate, &rdev2->flags); | |
9094 | } | |
9095 | ||
70bcecdb GR |
9096 | if (role != rdev2->raid_disk) { |
9097 | /* got activated */ | |
9098 | if (rdev2->raid_disk == -1 && role != 0xffff) { | |
9099 | rdev2->saved_raid_disk = role; | |
9100 | ret = remove_and_add_spares(mddev, rdev2); | |
9101 | pr_info("Activated spare: %s\n", | |
9d48739e | 9102 | bdevname(rdev2->bdev,b)); |
a578183e GJ |
9103 | /* wakeup mddev->thread here, so array could |
9104 | * perform resync with the new activated disk */ | |
9105 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
9106 | md_wakeup_thread(mddev->thread); | |
9107 | ||
70bcecdb GR |
9108 | } |
9109 | /* device faulty | |
9110 | * We just want to do the minimum to mark the disk | |
9111 | * as faulty. The recovery is performed by the | |
9112 | * one who initiated the error. | |
9113 | */ | |
9114 | if ((role == 0xfffe) || (role == 0xfffd)) { | |
9115 | md_error(mddev, rdev2); | |
9116 | clear_bit(Blocked, &rdev2->flags); | |
9117 | } | |
9118 | } | |
1d7e3e96 | 9119 | } |
70bcecdb | 9120 | |
28c1b9fd GR |
9121 | if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) |
9122 | update_raid_disks(mddev, le32_to_cpu(sb->raid_disks)); | |
70bcecdb GR |
9123 | |
9124 | /* Finally set the event to be up to date */ | |
9125 | mddev->events = le64_to_cpu(sb->events); | |
9126 | } | |
9127 | ||
9128 | static int read_rdev(struct mddev *mddev, struct md_rdev *rdev) | |
9129 | { | |
9130 | int err; | |
9131 | struct page *swapout = rdev->sb_page; | |
9132 | struct mdp_superblock_1 *sb; | |
9133 | ||
9134 | /* Store the sb page of the rdev in the swapout temporary | |
9135 | * variable in case we err in the future | |
9136 | */ | |
9137 | rdev->sb_page = NULL; | |
7f0f0d87 N |
9138 | err = alloc_disk_sb(rdev); |
9139 | if (err == 0) { | |
9140 | ClearPageUptodate(rdev->sb_page); | |
9141 | rdev->sb_loaded = 0; | |
9142 | err = super_types[mddev->major_version]. | |
9143 | load_super(rdev, NULL, mddev->minor_version); | |
9144 | } | |
70bcecdb GR |
9145 | if (err < 0) { |
9146 | pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n", | |
9147 | __func__, __LINE__, rdev->desc_nr, err); | |
7f0f0d87 N |
9148 | if (rdev->sb_page) |
9149 | put_page(rdev->sb_page); | |
70bcecdb GR |
9150 | rdev->sb_page = swapout; |
9151 | rdev->sb_loaded = 1; | |
9152 | return err; | |
1d7e3e96 GR |
9153 | } |
9154 | ||
70bcecdb GR |
9155 | sb = page_address(rdev->sb_page); |
9156 | /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET | |
9157 | * is not set | |
9158 | */ | |
9159 | ||
9160 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET)) | |
9161 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
9162 | ||
9163 | /* The other node finished recovery, call spare_active to set | |
9164 | * device In_sync and mddev->degraded | |
9165 | */ | |
9166 | if (rdev->recovery_offset == MaxSector && | |
9167 | !test_bit(In_sync, &rdev->flags) && | |
9168 | mddev->pers->spare_active(mddev)) | |
9169 | sysfs_notify(&mddev->kobj, NULL, "degraded"); | |
9170 | ||
9171 | put_page(swapout); | |
9172 | return 0; | |
9173 | } | |
9174 | ||
9175 | void md_reload_sb(struct mddev *mddev, int nr) | |
9176 | { | |
9177 | struct md_rdev *rdev; | |
9178 | int err; | |
9179 | ||
9180 | /* Find the rdev */ | |
9181 | rdev_for_each_rcu(rdev, mddev) { | |
9182 | if (rdev->desc_nr == nr) | |
9183 | break; | |
9184 | } | |
9185 | ||
9186 | if (!rdev || rdev->desc_nr != nr) { | |
9187 | pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr); | |
9188 | return; | |
9189 | } | |
9190 | ||
9191 | err = read_rdev(mddev, rdev); | |
9192 | if (err < 0) | |
9193 | return; | |
9194 | ||
9195 | check_sb_changes(mddev, rdev); | |
9196 | ||
9197 | /* Read all rdev's to update recovery_offset */ | |
9198 | rdev_for_each_rcu(rdev, mddev) | |
9199 | read_rdev(mddev, rdev); | |
1d7e3e96 GR |
9200 | } |
9201 | EXPORT_SYMBOL(md_reload_sb); | |
9202 | ||
1da177e4 LT |
9203 | #ifndef MODULE |
9204 | ||
9205 | /* | |
9206 | * Searches all registered partitions for autorun RAID arrays | |
9207 | * at boot time. | |
9208 | */ | |
4d936ec1 | 9209 | |
5b1f5bc3 | 9210 | static DEFINE_MUTEX(detected_devices_mutex); |
4d936ec1 ME |
9211 | static LIST_HEAD(all_detected_devices); |
9212 | struct detected_devices_node { | |
9213 | struct list_head list; | |
9214 | dev_t dev; | |
9215 | }; | |
1da177e4 LT |
9216 | |
9217 | void md_autodetect_dev(dev_t dev) | |
9218 | { | |
4d936ec1 ME |
9219 | struct detected_devices_node *node_detected_dev; |
9220 | ||
9221 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
9222 | if (node_detected_dev) { | |
9223 | node_detected_dev->dev = dev; | |
5b1f5bc3 | 9224 | mutex_lock(&detected_devices_mutex); |
4d936ec1 | 9225 | list_add_tail(&node_detected_dev->list, &all_detected_devices); |
5b1f5bc3 | 9226 | mutex_unlock(&detected_devices_mutex); |
4d936ec1 | 9227 | } |
1da177e4 LT |
9228 | } |
9229 | ||
1da177e4 LT |
9230 | static void autostart_arrays(int part) |
9231 | { | |
3cb03002 | 9232 | struct md_rdev *rdev; |
4d936ec1 ME |
9233 | struct detected_devices_node *node_detected_dev; |
9234 | dev_t dev; | |
9235 | int i_scanned, i_passed; | |
1da177e4 | 9236 | |
4d936ec1 ME |
9237 | i_scanned = 0; |
9238 | i_passed = 0; | |
1da177e4 | 9239 | |
9d48739e | 9240 | pr_info("md: Autodetecting RAID arrays.\n"); |
1da177e4 | 9241 | |
5b1f5bc3 | 9242 | mutex_lock(&detected_devices_mutex); |
4d936ec1 ME |
9243 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
9244 | i_scanned++; | |
9245 | node_detected_dev = list_entry(all_detected_devices.next, | |
9246 | struct detected_devices_node, list); | |
9247 | list_del(&node_detected_dev->list); | |
9248 | dev = node_detected_dev->dev; | |
9249 | kfree(node_detected_dev); | |
90bcf133 | 9250 | mutex_unlock(&detected_devices_mutex); |
df968c4e | 9251 | rdev = md_import_device(dev,0, 90); |
90bcf133 | 9252 | mutex_lock(&detected_devices_mutex); |
1da177e4 LT |
9253 | if (IS_ERR(rdev)) |
9254 | continue; | |
9255 | ||
403df478 | 9256 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 9257 | continue; |
403df478 | 9258 | |
d0fae18f | 9259 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 9260 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 9261 | i_passed++; |
1da177e4 | 9262 | } |
5b1f5bc3 | 9263 | mutex_unlock(&detected_devices_mutex); |
4d936ec1 | 9264 | |
9d48739e | 9265 | pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed); |
1da177e4 LT |
9266 | |
9267 | autorun_devices(part); | |
9268 | } | |
9269 | ||
fdee8ae4 | 9270 | #endif /* !MODULE */ |
1da177e4 LT |
9271 | |
9272 | static __exit void md_exit(void) | |
9273 | { | |
fd01b88c | 9274 | struct mddev *mddev; |
1da177e4 | 9275 | struct list_head *tmp; |
e2f23b60 | 9276 | int delay = 1; |
8ab5e4c1 | 9277 | |
af5628f0 | 9278 | blk_unregister_region(MKDEV(MD_MAJOR,0), 512); |
e8703fe1 | 9279 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 9280 | |
3dbd8c2e | 9281 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
9282 | unregister_blkdev(mdp_major, "mdp"); |
9283 | unregister_reboot_notifier(&md_notifier); | |
9284 | unregister_sysctl_table(raid_table_header); | |
e2f23b60 N |
9285 | |
9286 | /* We cannot unload the modules while some process is | |
9287 | * waiting for us in select() or poll() - wake them up | |
9288 | */ | |
9289 | md_unloading = 1; | |
9290 | while (waitqueue_active(&md_event_waiters)) { | |
9291 | /* not safe to leave yet */ | |
9292 | wake_up(&md_event_waiters); | |
9293 | msleep(delay); | |
9294 | delay += delay; | |
9295 | } | |
1da177e4 | 9296 | remove_proc_entry("mdstat", NULL); |
e2f23b60 | 9297 | |
29ac4aa3 | 9298 | for_each_mddev(mddev, tmp) { |
1da177e4 | 9299 | export_array(mddev); |
9356863c | 9300 | mddev->ctime = 0; |
d3374825 | 9301 | mddev->hold_active = 0; |
9356863c N |
9302 | /* |
9303 | * for_each_mddev() will call mddev_put() at the end of each | |
9304 | * iteration. As the mddev is now fully clear, this will | |
9305 | * schedule the mddev for destruction by a workqueue, and the | |
9306 | * destroy_workqueue() below will wait for that to complete. | |
9307 | */ | |
1da177e4 | 9308 | } |
e804ac78 TH |
9309 | destroy_workqueue(md_misc_wq); |
9310 | destroy_workqueue(md_wq); | |
1da177e4 LT |
9311 | } |
9312 | ||
685784aa | 9313 | subsys_initcall(md_init); |
1da177e4 LT |
9314 | module_exit(md_exit) |
9315 | ||
f91de92e N |
9316 | static int get_ro(char *buffer, struct kernel_param *kp) |
9317 | { | |
9318 | return sprintf(buffer, "%d", start_readonly); | |
9319 | } | |
9320 | static int set_ro(const char *val, struct kernel_param *kp) | |
9321 | { | |
4c9309c0 | 9322 | return kstrtouint(val, 10, (unsigned int *)&start_readonly); |
f91de92e N |
9323 | } |
9324 | ||
80ca3a44 N |
9325 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
9326 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
efeb53c0 | 9327 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
78b6350d | 9328 | module_param(create_on_open, bool, S_IRUSR|S_IWUSR); |
f91de92e | 9329 | |
1da177e4 | 9330 | MODULE_LICENSE("GPL"); |
0efb9e61 | 9331 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 9332 | MODULE_ALIAS("md"); |
72008652 | 9333 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |