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1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
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. | |
33 | */ | |
34 | ||
a6fb0934 | 35 | #include <linux/kthread.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
1da177e4 | 37 | #include <linux/sysctl.h> |
bff61975 | 38 | #include <linux/seq_file.h> |
2a48fc0a | 39 | #include <linux/mutex.h> |
1da177e4 | 40 | #include <linux/buffer_head.h> /* for invalidate_bdev */ |
d7603b7e | 41 | #include <linux/poll.h> |
16f17b39 | 42 | #include <linux/ctype.h> |
e7d2860b | 43 | #include <linux/string.h> |
fb4d8c76 N |
44 | #include <linux/hdreg.h> |
45 | #include <linux/proc_fs.h> | |
46 | #include <linux/random.h> | |
47 | #include <linux/reboot.h> | |
32a7627c | 48 | #include <linux/file.h> |
aa98aa31 | 49 | #include <linux/compat.h> |
25570727 | 50 | #include <linux/delay.h> |
bff61975 N |
51 | #include <linux/raid/md_p.h> |
52 | #include <linux/raid/md_u.h> | |
5a0e3ad6 | 53 | #include <linux/slab.h> |
43b2e5d8 | 54 | #include "md.h" |
ef740c37 | 55 | #include "bitmap.h" |
1da177e4 LT |
56 | |
57 | #define DEBUG 0 | |
58 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
59 | ||
1da177e4 | 60 | #ifndef MODULE |
d710e138 | 61 | static void autostart_arrays(int part); |
1da177e4 LT |
62 | #endif |
63 | ||
2604b703 | 64 | static LIST_HEAD(pers_list); |
1da177e4 LT |
65 | static DEFINE_SPINLOCK(pers_lock); |
66 | ||
5e56341d AB |
67 | static void md_print_devices(void); |
68 | ||
90b08710 | 69 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
e804ac78 TH |
70 | static struct workqueue_struct *md_wq; |
71 | static struct workqueue_struct *md_misc_wq; | |
90b08710 | 72 | |
5e56341d AB |
73 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
74 | ||
1e50915f RB |
75 | /* |
76 | * Default number of read corrections we'll attempt on an rdev | |
77 | * before ejecting it from the array. We divide the read error | |
78 | * count by 2 for every hour elapsed between read errors. | |
79 | */ | |
80 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
81 | /* |
82 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
83 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
84 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 85 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
86 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
87 | * speed limit - in case reconstruction slows down your system despite | |
88 | * idle IO detection. | |
89 | * | |
90 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 91 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
92 | */ |
93 | ||
94 | static int sysctl_speed_limit_min = 1000; | |
95 | static int sysctl_speed_limit_max = 200000; | |
88202a0c N |
96 | static inline int speed_min(mddev_t *mddev) |
97 | { | |
98 | return mddev->sync_speed_min ? | |
99 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
100 | } | |
101 | ||
102 | static inline int speed_max(mddev_t *mddev) | |
103 | { | |
104 | return mddev->sync_speed_max ? | |
105 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
106 | } | |
1da177e4 LT |
107 | |
108 | static struct ctl_table_header *raid_table_header; | |
109 | ||
110 | static ctl_table raid_table[] = { | |
111 | { | |
1da177e4 LT |
112 | .procname = "speed_limit_min", |
113 | .data = &sysctl_speed_limit_min, | |
114 | .maxlen = sizeof(int), | |
80ca3a44 | 115 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 116 | .proc_handler = proc_dointvec, |
1da177e4 LT |
117 | }, |
118 | { | |
1da177e4 LT |
119 | .procname = "speed_limit_max", |
120 | .data = &sysctl_speed_limit_max, | |
121 | .maxlen = sizeof(int), | |
80ca3a44 | 122 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 123 | .proc_handler = proc_dointvec, |
1da177e4 | 124 | }, |
894d2491 | 125 | { } |
1da177e4 LT |
126 | }; |
127 | ||
128 | static ctl_table raid_dir_table[] = { | |
129 | { | |
1da177e4 LT |
130 | .procname = "raid", |
131 | .maxlen = 0, | |
80ca3a44 | 132 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
133 | .child = raid_table, |
134 | }, | |
894d2491 | 135 | { } |
1da177e4 LT |
136 | }; |
137 | ||
138 | static ctl_table raid_root_table[] = { | |
139 | { | |
1da177e4 LT |
140 | .procname = "dev", |
141 | .maxlen = 0, | |
142 | .mode = 0555, | |
143 | .child = raid_dir_table, | |
144 | }, | |
894d2491 | 145 | { } |
1da177e4 LT |
146 | }; |
147 | ||
83d5cde4 | 148 | static const struct block_device_operations md_fops; |
1da177e4 | 149 | |
f91de92e N |
150 | static int start_readonly; |
151 | ||
a167f663 N |
152 | /* bio_clone_mddev |
153 | * like bio_clone, but with a local bio set | |
154 | */ | |
155 | ||
156 | static void mddev_bio_destructor(struct bio *bio) | |
157 | { | |
158 | mddev_t *mddev, **mddevp; | |
159 | ||
160 | mddevp = (void*)bio; | |
161 | mddev = mddevp[-1]; | |
162 | ||
163 | bio_free(bio, mddev->bio_set); | |
164 | } | |
165 | ||
166 | struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, | |
167 | mddev_t *mddev) | |
168 | { | |
169 | struct bio *b; | |
170 | mddev_t **mddevp; | |
171 | ||
172 | if (!mddev || !mddev->bio_set) | |
173 | return bio_alloc(gfp_mask, nr_iovecs); | |
174 | ||
175 | b = bio_alloc_bioset(gfp_mask, nr_iovecs, | |
176 | mddev->bio_set); | |
177 | if (!b) | |
178 | return NULL; | |
179 | mddevp = (void*)b; | |
180 | mddevp[-1] = mddev; | |
181 | b->bi_destructor = mddev_bio_destructor; | |
182 | return b; | |
183 | } | |
184 | EXPORT_SYMBOL_GPL(bio_alloc_mddev); | |
185 | ||
186 | struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, | |
187 | mddev_t *mddev) | |
188 | { | |
189 | struct bio *b; | |
190 | mddev_t **mddevp; | |
191 | ||
192 | if (!mddev || !mddev->bio_set) | |
193 | return bio_clone(bio, gfp_mask); | |
194 | ||
195 | b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs, | |
196 | mddev->bio_set); | |
197 | if (!b) | |
198 | return NULL; | |
199 | mddevp = (void*)b; | |
200 | mddevp[-1] = mddev; | |
201 | b->bi_destructor = mddev_bio_destructor; | |
202 | __bio_clone(b, bio); | |
203 | if (bio_integrity(bio)) { | |
204 | int ret; | |
205 | ||
206 | ret = bio_integrity_clone(b, bio, gfp_mask, mddev->bio_set); | |
207 | ||
208 | if (ret < 0) { | |
209 | bio_put(b); | |
210 | return NULL; | |
211 | } | |
212 | } | |
213 | ||
214 | return b; | |
215 | } | |
216 | EXPORT_SYMBOL_GPL(bio_clone_mddev); | |
217 | ||
d7603b7e N |
218 | /* |
219 | * We have a system wide 'event count' that is incremented | |
220 | * on any 'interesting' event, and readers of /proc/mdstat | |
221 | * can use 'poll' or 'select' to find out when the event | |
222 | * count increases. | |
223 | * | |
224 | * Events are: | |
225 | * start array, stop array, error, add device, remove device, | |
226 | * start build, activate spare | |
227 | */ | |
2989ddbd | 228 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 229 | static atomic_t md_event_count; |
29269553 | 230 | void md_new_event(mddev_t *mddev) |
d7603b7e N |
231 | { |
232 | atomic_inc(&md_event_count); | |
233 | wake_up(&md_event_waiters); | |
234 | } | |
29269553 | 235 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 236 | |
c331eb04 N |
237 | /* Alternate version that can be called from interrupts |
238 | * when calling sysfs_notify isn't needed. | |
239 | */ | |
05381954 | 240 | static void md_new_event_inintr(mddev_t *mddev) |
c331eb04 N |
241 | { |
242 | atomic_inc(&md_event_count); | |
243 | wake_up(&md_event_waiters); | |
244 | } | |
245 | ||
1da177e4 LT |
246 | /* |
247 | * Enables to iterate over all existing md arrays | |
248 | * all_mddevs_lock protects this list. | |
249 | */ | |
250 | static LIST_HEAD(all_mddevs); | |
251 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
252 | ||
253 | ||
254 | /* | |
255 | * iterates through all used mddevs in the system. | |
256 | * We take care to grab the all_mddevs_lock whenever navigating | |
257 | * the list, and to always hold a refcount when unlocked. | |
258 | * Any code which breaks out of this loop while own | |
259 | * a reference to the current mddev and must mddev_put it. | |
260 | */ | |
29ac4aa3 | 261 | #define for_each_mddev(mddev,tmp) \ |
1da177e4 LT |
262 | \ |
263 | for (({ spin_lock(&all_mddevs_lock); \ | |
264 | tmp = all_mddevs.next; \ | |
265 | mddev = NULL;}); \ | |
266 | ({ if (tmp != &all_mddevs) \ | |
267 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
268 | spin_unlock(&all_mddevs_lock); \ | |
269 | if (mddev) mddev_put(mddev); \ | |
270 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
271 | tmp != &all_mddevs;}); \ | |
272 | ({ spin_lock(&all_mddevs_lock); \ | |
273 | tmp = tmp->next;}) \ | |
274 | ) | |
275 | ||
276 | ||
409c57f3 N |
277 | /* Rather than calling directly into the personality make_request function, |
278 | * IO requests come here first so that we can check if the device is | |
279 | * being suspended pending a reconfiguration. | |
280 | * We hold a refcount over the call to ->make_request. By the time that | |
281 | * call has finished, the bio has been linked into some internal structure | |
282 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
283 | */ | |
284 | static int md_make_request(struct request_queue *q, struct bio *bio) | |
1da177e4 | 285 | { |
49077326 | 286 | const int rw = bio_data_dir(bio); |
409c57f3 N |
287 | mddev_t *mddev = q->queuedata; |
288 | int rv; | |
49077326 N |
289 | int cpu; |
290 | ||
0ca69886 N |
291 | if (mddev == NULL || mddev->pers == NULL |
292 | || !mddev->ready) { | |
409c57f3 N |
293 | bio_io_error(bio); |
294 | return 0; | |
295 | } | |
0ca69886 | 296 | smp_rmb(); /* Ensure implications of 'active' are visible */ |
409c57f3 | 297 | rcu_read_lock(); |
e9c7469b | 298 | if (mddev->suspended) { |
409c57f3 N |
299 | DEFINE_WAIT(__wait); |
300 | for (;;) { | |
301 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
302 | TASK_UNINTERRUPTIBLE); | |
e9c7469b | 303 | if (!mddev->suspended) |
409c57f3 N |
304 | break; |
305 | rcu_read_unlock(); | |
306 | schedule(); | |
307 | rcu_read_lock(); | |
308 | } | |
309 | finish_wait(&mddev->sb_wait, &__wait); | |
310 | } | |
311 | atomic_inc(&mddev->active_io); | |
312 | rcu_read_unlock(); | |
49077326 | 313 | |
21a52c6d | 314 | rv = mddev->pers->make_request(mddev, bio); |
49077326 N |
315 | |
316 | cpu = part_stat_lock(); | |
317 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); | |
318 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], | |
319 | bio_sectors(bio)); | |
320 | part_stat_unlock(); | |
321 | ||
409c57f3 N |
322 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
323 | wake_up(&mddev->sb_wait); | |
324 | ||
325 | return rv; | |
326 | } | |
327 | ||
9e35b99c N |
328 | /* mddev_suspend makes sure no new requests are submitted |
329 | * to the device, and that any requests that have been submitted | |
330 | * are completely handled. | |
331 | * Once ->stop is called and completes, the module will be completely | |
332 | * unused. | |
333 | */ | |
390ee602 | 334 | void mddev_suspend(mddev_t *mddev) |
409c57f3 N |
335 | { |
336 | BUG_ON(mddev->suspended); | |
337 | mddev->suspended = 1; | |
338 | synchronize_rcu(); | |
339 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
340 | mddev->pers->quiesce(mddev, 1); | |
409c57f3 | 341 | } |
390ee602 | 342 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 343 | |
390ee602 | 344 | void mddev_resume(mddev_t *mddev) |
409c57f3 N |
345 | { |
346 | mddev->suspended = 0; | |
347 | wake_up(&mddev->sb_wait); | |
348 | mddev->pers->quiesce(mddev, 0); | |
1da177e4 | 349 | } |
390ee602 | 350 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 351 | |
3fa841d7 N |
352 | int mddev_congested(mddev_t *mddev, int bits) |
353 | { | |
354 | return mddev->suspended; | |
355 | } | |
356 | EXPORT_SYMBOL(mddev_congested); | |
357 | ||
a2826aa9 | 358 | /* |
e9c7469b | 359 | * Generic flush handling for md |
a2826aa9 N |
360 | */ |
361 | ||
e9c7469b | 362 | static void md_end_flush(struct bio *bio, int err) |
a2826aa9 N |
363 | { |
364 | mdk_rdev_t *rdev = bio->bi_private; | |
365 | mddev_t *mddev = rdev->mddev; | |
a2826aa9 N |
366 | |
367 | rdev_dec_pending(rdev, mddev); | |
368 | ||
369 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b | 370 | /* The pre-request flush has finished */ |
e804ac78 | 371 | queue_work(md_wq, &mddev->flush_work); |
a2826aa9 N |
372 | } |
373 | bio_put(bio); | |
374 | } | |
375 | ||
a7a07e69 N |
376 | static void md_submit_flush_data(struct work_struct *ws); |
377 | ||
a035fc3e | 378 | static void submit_flushes(struct work_struct *ws) |
a2826aa9 | 379 | { |
a035fc3e | 380 | mddev_t *mddev = container_of(ws, mddev_t, flush_work); |
a2826aa9 N |
381 | mdk_rdev_t *rdev; |
382 | ||
a7a07e69 N |
383 | INIT_WORK(&mddev->flush_work, md_submit_flush_data); |
384 | atomic_set(&mddev->flush_pending, 1); | |
a2826aa9 N |
385 | rcu_read_lock(); |
386 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
387 | if (rdev->raid_disk >= 0 && | |
388 | !test_bit(Faulty, &rdev->flags)) { | |
389 | /* Take two references, one is dropped | |
390 | * when request finishes, one after | |
391 | * we reclaim rcu_read_lock | |
392 | */ | |
393 | struct bio *bi; | |
394 | atomic_inc(&rdev->nr_pending); | |
395 | atomic_inc(&rdev->nr_pending); | |
396 | rcu_read_unlock(); | |
a167f663 | 397 | bi = bio_alloc_mddev(GFP_KERNEL, 0, mddev); |
e9c7469b | 398 | bi->bi_end_io = md_end_flush; |
a2826aa9 N |
399 | bi->bi_private = rdev; |
400 | bi->bi_bdev = rdev->bdev; | |
401 | atomic_inc(&mddev->flush_pending); | |
e9c7469b | 402 | submit_bio(WRITE_FLUSH, bi); |
a2826aa9 N |
403 | rcu_read_lock(); |
404 | rdev_dec_pending(rdev, mddev); | |
405 | } | |
406 | rcu_read_unlock(); | |
a7a07e69 N |
407 | if (atomic_dec_and_test(&mddev->flush_pending)) |
408 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 N |
409 | } |
410 | ||
e9c7469b | 411 | static void md_submit_flush_data(struct work_struct *ws) |
a2826aa9 | 412 | { |
e9c7469b TH |
413 | mddev_t *mddev = container_of(ws, mddev_t, flush_work); |
414 | struct bio *bio = mddev->flush_bio; | |
a2826aa9 | 415 | |
e9c7469b | 416 | if (bio->bi_size == 0) |
a2826aa9 N |
417 | /* an empty barrier - all done */ |
418 | bio_endio(bio, 0); | |
419 | else { | |
e9c7469b | 420 | bio->bi_rw &= ~REQ_FLUSH; |
21a52c6d | 421 | if (mddev->pers->make_request(mddev, bio)) |
a2826aa9 | 422 | generic_make_request(bio); |
a2826aa9 | 423 | } |
2b74e12e N |
424 | |
425 | mddev->flush_bio = NULL; | |
426 | wake_up(&mddev->sb_wait); | |
a2826aa9 N |
427 | } |
428 | ||
e9c7469b | 429 | void md_flush_request(mddev_t *mddev, struct bio *bio) |
a2826aa9 N |
430 | { |
431 | spin_lock_irq(&mddev->write_lock); | |
432 | wait_event_lock_irq(mddev->sb_wait, | |
e9c7469b | 433 | !mddev->flush_bio, |
a2826aa9 | 434 | mddev->write_lock, /*nothing*/); |
e9c7469b | 435 | mddev->flush_bio = bio; |
a2826aa9 N |
436 | spin_unlock_irq(&mddev->write_lock); |
437 | ||
a035fc3e N |
438 | INIT_WORK(&mddev->flush_work, submit_flushes); |
439 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 | 440 | } |
e9c7469b | 441 | EXPORT_SYMBOL(md_flush_request); |
409c57f3 | 442 | |
2ac87401 N |
443 | /* Support for plugging. |
444 | * This mirrors the plugging support in request_queue, but does not | |
445 | * require having a whole queue | |
446 | */ | |
447 | static void plugger_work(struct work_struct *work) | |
448 | { | |
449 | struct plug_handle *plug = | |
450 | container_of(work, struct plug_handle, unplug_work); | |
451 | plug->unplug_fn(plug); | |
452 | } | |
453 | static void plugger_timeout(unsigned long data) | |
454 | { | |
455 | struct plug_handle *plug = (void *)data; | |
456 | kblockd_schedule_work(NULL, &plug->unplug_work); | |
457 | } | |
458 | void plugger_init(struct plug_handle *plug, | |
459 | void (*unplug_fn)(struct plug_handle *)) | |
460 | { | |
461 | plug->unplug_flag = 0; | |
462 | plug->unplug_fn = unplug_fn; | |
463 | init_timer(&plug->unplug_timer); | |
464 | plug->unplug_timer.function = plugger_timeout; | |
465 | plug->unplug_timer.data = (unsigned long)plug; | |
466 | INIT_WORK(&plug->unplug_work, plugger_work); | |
467 | } | |
468 | EXPORT_SYMBOL_GPL(plugger_init); | |
469 | ||
470 | void plugger_set_plug(struct plug_handle *plug) | |
471 | { | |
472 | if (!test_and_set_bit(PLUGGED_FLAG, &plug->unplug_flag)) | |
473 | mod_timer(&plug->unplug_timer, jiffies + msecs_to_jiffies(3)+1); | |
474 | } | |
475 | EXPORT_SYMBOL_GPL(plugger_set_plug); | |
476 | ||
477 | int plugger_remove_plug(struct plug_handle *plug) | |
478 | { | |
479 | if (test_and_clear_bit(PLUGGED_FLAG, &plug->unplug_flag)) { | |
480 | del_timer(&plug->unplug_timer); | |
481 | return 1; | |
482 | } else | |
483 | return 0; | |
484 | } | |
485 | EXPORT_SYMBOL_GPL(plugger_remove_plug); | |
486 | ||
487 | ||
1da177e4 LT |
488 | static inline mddev_t *mddev_get(mddev_t *mddev) |
489 | { | |
490 | atomic_inc(&mddev->active); | |
491 | return mddev; | |
492 | } | |
493 | ||
5fd3a17e | 494 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 495 | |
1da177e4 LT |
496 | static void mddev_put(mddev_t *mddev) |
497 | { | |
a167f663 N |
498 | struct bio_set *bs = NULL; |
499 | ||
1da177e4 LT |
500 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
501 | return; | |
d3374825 | 502 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
503 | mddev->ctime == 0 && !mddev->hold_active) { |
504 | /* Array is not configured at all, and not held active, | |
505 | * so destroy it */ | |
1da177e4 | 506 | list_del(&mddev->all_mddevs); |
a167f663 N |
507 | bs = mddev->bio_set; |
508 | mddev->bio_set = NULL; | |
d3374825 | 509 | if (mddev->gendisk) { |
e804ac78 TH |
510 | /* We did a probe so need to clean up. Call |
511 | * queue_work inside the spinlock so that | |
512 | * flush_workqueue() after mddev_find will | |
513 | * succeed in waiting for the work to be done. | |
d3374825 N |
514 | */ |
515 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
e804ac78 | 516 | queue_work(md_misc_wq, &mddev->del_work); |
d3374825 N |
517 | } else |
518 | kfree(mddev); | |
519 | } | |
520 | spin_unlock(&all_mddevs_lock); | |
a167f663 N |
521 | if (bs) |
522 | bioset_free(bs); | |
1da177e4 LT |
523 | } |
524 | ||
390ee602 | 525 | void mddev_init(mddev_t *mddev) |
fafd7fb0 N |
526 | { |
527 | mutex_init(&mddev->open_mutex); | |
528 | mutex_init(&mddev->reconfig_mutex); | |
529 | mutex_init(&mddev->bitmap_info.mutex); | |
530 | INIT_LIST_HEAD(&mddev->disks); | |
531 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
532 | init_timer(&mddev->safemode_timer); | |
533 | atomic_set(&mddev->active, 1); | |
534 | atomic_set(&mddev->openers, 0); | |
535 | atomic_set(&mddev->active_io, 0); | |
536 | spin_lock_init(&mddev->write_lock); | |
537 | atomic_set(&mddev->flush_pending, 0); | |
538 | init_waitqueue_head(&mddev->sb_wait); | |
539 | init_waitqueue_head(&mddev->recovery_wait); | |
540 | mddev->reshape_position = MaxSector; | |
541 | mddev->resync_min = 0; | |
542 | mddev->resync_max = MaxSector; | |
543 | mddev->level = LEVEL_NONE; | |
544 | } | |
390ee602 | 545 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 546 | |
1da177e4 LT |
547 | static mddev_t * mddev_find(dev_t unit) |
548 | { | |
549 | mddev_t *mddev, *new = NULL; | |
550 | ||
551 | retry: | |
552 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
553 | |
554 | if (unit) { | |
555 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
556 | if (mddev->unit == unit) { | |
557 | mddev_get(mddev); | |
558 | spin_unlock(&all_mddevs_lock); | |
559 | kfree(new); | |
560 | return mddev; | |
561 | } | |
562 | ||
563 | if (new) { | |
564 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 565 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
566 | new->hold_active = UNTIL_IOCTL; |
567 | return new; | |
1da177e4 | 568 | } |
efeb53c0 N |
569 | } else if (new) { |
570 | /* find an unused unit number */ | |
571 | static int next_minor = 512; | |
572 | int start = next_minor; | |
573 | int is_free = 0; | |
574 | int dev = 0; | |
575 | while (!is_free) { | |
576 | dev = MKDEV(MD_MAJOR, next_minor); | |
577 | next_minor++; | |
578 | if (next_minor > MINORMASK) | |
579 | next_minor = 0; | |
580 | if (next_minor == start) { | |
581 | /* Oh dear, all in use. */ | |
582 | spin_unlock(&all_mddevs_lock); | |
583 | kfree(new); | |
584 | return NULL; | |
585 | } | |
586 | ||
587 | is_free = 1; | |
588 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
589 | if (mddev->unit == dev) { | |
590 | is_free = 0; | |
591 | break; | |
592 | } | |
593 | } | |
594 | new->unit = dev; | |
595 | new->md_minor = MINOR(dev); | |
596 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
597 | list_add(&new->all_mddevs, &all_mddevs); |
598 | spin_unlock(&all_mddevs_lock); | |
599 | return new; | |
600 | } | |
601 | spin_unlock(&all_mddevs_lock); | |
602 | ||
9ffae0cf | 603 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
604 | if (!new) |
605 | return NULL; | |
606 | ||
1da177e4 LT |
607 | new->unit = unit; |
608 | if (MAJOR(unit) == MD_MAJOR) | |
609 | new->md_minor = MINOR(unit); | |
610 | else | |
611 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
612 | ||
fafd7fb0 | 613 | mddev_init(new); |
1da177e4 | 614 | |
1da177e4 LT |
615 | goto retry; |
616 | } | |
617 | ||
618 | static inline int mddev_lock(mddev_t * mddev) | |
619 | { | |
df5b89b3 | 620 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
621 | } |
622 | ||
b522adcd DW |
623 | static inline int mddev_is_locked(mddev_t *mddev) |
624 | { | |
625 | return mutex_is_locked(&mddev->reconfig_mutex); | |
626 | } | |
627 | ||
1da177e4 LT |
628 | static inline int mddev_trylock(mddev_t * mddev) |
629 | { | |
df5b89b3 | 630 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
631 | } |
632 | ||
b6eb127d N |
633 | static struct attribute_group md_redundancy_group; |
634 | ||
a64c876f | 635 | static void mddev_unlock(mddev_t * mddev) |
1da177e4 | 636 | { |
a64c876f | 637 | if (mddev->to_remove) { |
b6eb127d N |
638 | /* These cannot be removed under reconfig_mutex as |
639 | * an access to the files will try to take reconfig_mutex | |
640 | * while holding the file unremovable, which leads to | |
641 | * a deadlock. | |
bb4f1e9d N |
642 | * So hold set sysfs_active while the remove in happeing, |
643 | * and anything else which might set ->to_remove or my | |
644 | * otherwise change the sysfs namespace will fail with | |
645 | * -EBUSY if sysfs_active is still set. | |
646 | * We set sysfs_active under reconfig_mutex and elsewhere | |
647 | * test it under the same mutex to ensure its correct value | |
648 | * is seen. | |
b6eb127d | 649 | */ |
a64c876f N |
650 | struct attribute_group *to_remove = mddev->to_remove; |
651 | mddev->to_remove = NULL; | |
bb4f1e9d | 652 | mddev->sysfs_active = 1; |
b6eb127d N |
653 | mutex_unlock(&mddev->reconfig_mutex); |
654 | ||
00bcb4ac N |
655 | if (mddev->kobj.sd) { |
656 | if (to_remove != &md_redundancy_group) | |
657 | sysfs_remove_group(&mddev->kobj, to_remove); | |
658 | if (mddev->pers == NULL || | |
659 | mddev->pers->sync_request == NULL) { | |
660 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
661 | if (mddev->sysfs_action) | |
662 | sysfs_put(mddev->sysfs_action); | |
663 | mddev->sysfs_action = NULL; | |
664 | } | |
a64c876f | 665 | } |
bb4f1e9d | 666 | mddev->sysfs_active = 0; |
b6eb127d N |
667 | } else |
668 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 669 | |
005eca5e | 670 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
671 | } |
672 | ||
2989ddbd | 673 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 | 674 | { |
159ec1fc | 675 | mdk_rdev_t *rdev; |
1da177e4 | 676 | |
159ec1fc | 677 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
678 | if (rdev->desc_nr == nr) |
679 | return rdev; | |
159ec1fc | 680 | |
1da177e4 LT |
681 | return NULL; |
682 | } | |
683 | ||
684 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
685 | { | |
1da177e4 LT |
686 | mdk_rdev_t *rdev; |
687 | ||
159ec1fc | 688 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
689 | if (rdev->bdev->bd_dev == dev) |
690 | return rdev; | |
159ec1fc | 691 | |
1da177e4 LT |
692 | return NULL; |
693 | } | |
694 | ||
d9d166c2 | 695 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
696 | { |
697 | struct mdk_personality *pers; | |
d9d166c2 N |
698 | list_for_each_entry(pers, &pers_list, list) { |
699 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 700 | return pers; |
d9d166c2 N |
701 | if (strcmp(pers->name, clevel)==0) |
702 | return pers; | |
703 | } | |
2604b703 N |
704 | return NULL; |
705 | } | |
706 | ||
b73df2d3 | 707 | /* return the offset of the super block in 512byte sectors */ |
77933d72 | 708 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 | 709 | { |
77304d2a | 710 | sector_t num_sectors = i_size_read(bdev->bd_inode) / 512; |
b73df2d3 | 711 | return MD_NEW_SIZE_SECTORS(num_sectors); |
1da177e4 LT |
712 | } |
713 | ||
1da177e4 LT |
714 | static int alloc_disk_sb(mdk_rdev_t * rdev) |
715 | { | |
716 | if (rdev->sb_page) | |
717 | MD_BUG(); | |
718 | ||
719 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
720 | if (!rdev->sb_page) { | |
721 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 722 | return -ENOMEM; |
1da177e4 LT |
723 | } |
724 | ||
725 | return 0; | |
726 | } | |
727 | ||
728 | static void free_disk_sb(mdk_rdev_t * rdev) | |
729 | { | |
730 | if (rdev->sb_page) { | |
2d1f3b5d | 731 | put_page(rdev->sb_page); |
1da177e4 LT |
732 | rdev->sb_loaded = 0; |
733 | rdev->sb_page = NULL; | |
0f420358 | 734 | rdev->sb_start = 0; |
dd8ac336 | 735 | rdev->sectors = 0; |
1da177e4 LT |
736 | } |
737 | } | |
738 | ||
739 | ||
6712ecf8 | 740 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
741 | { |
742 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 743 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 744 | |
3a0f5bbb N |
745 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
746 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
747 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
748 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 749 | md_error(mddev, rdev); |
3a0f5bbb | 750 | } |
7bfa19f2 | 751 | |
a9701a30 N |
752 | if (atomic_dec_and_test(&mddev->pending_writes)) |
753 | wake_up(&mddev->sb_wait); | |
f8b58edf | 754 | bio_put(bio); |
7bfa19f2 N |
755 | } |
756 | ||
757 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, | |
758 | sector_t sector, int size, struct page *page) | |
759 | { | |
760 | /* write first size bytes of page to sector of rdev | |
761 | * Increment mddev->pending_writes before returning | |
762 | * and decrement it on completion, waking up sb_wait | |
763 | * if zero is reached. | |
764 | * If an error occurred, call md_error | |
765 | */ | |
a167f663 | 766 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); |
7bfa19f2 N |
767 | |
768 | bio->bi_bdev = rdev->bdev; | |
769 | bio->bi_sector = sector; | |
770 | bio_add_page(bio, page, size, 0); | |
771 | bio->bi_private = rdev; | |
772 | bio->bi_end_io = super_written; | |
a9701a30 | 773 | |
7bfa19f2 | 774 | atomic_inc(&mddev->pending_writes); |
e9c7469b TH |
775 | submit_bio(REQ_WRITE | REQ_SYNC | REQ_UNPLUG | REQ_FLUSH | REQ_FUA, |
776 | bio); | |
a9701a30 N |
777 | } |
778 | ||
779 | void md_super_wait(mddev_t *mddev) | |
780 | { | |
e9c7469b | 781 | /* wait for all superblock writes that were scheduled to complete */ |
a9701a30 N |
782 | DEFINE_WAIT(wq); |
783 | for(;;) { | |
784 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
785 | if (atomic_read(&mddev->pending_writes)==0) | |
786 | break; | |
a9701a30 N |
787 | schedule(); |
788 | } | |
789 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
790 | } |
791 | ||
6712ecf8 | 792 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 793 | { |
1da177e4 | 794 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
795 | } |
796 | ||
2b193363 N |
797 | int sync_page_io(mdk_rdev_t *rdev, sector_t sector, int size, |
798 | struct page *page, int rw) | |
1da177e4 | 799 | { |
a167f663 | 800 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); |
1da177e4 LT |
801 | struct completion event; |
802 | int ret; | |
803 | ||
7b6d91da | 804 | rw |= REQ_SYNC | REQ_UNPLUG; |
1da177e4 | 805 | |
2b193363 | 806 | bio->bi_bdev = rdev->bdev; |
1da177e4 LT |
807 | bio->bi_sector = sector; |
808 | bio_add_page(bio, page, size, 0); | |
809 | init_completion(&event); | |
810 | bio->bi_private = &event; | |
811 | bio->bi_end_io = bi_complete; | |
812 | submit_bio(rw, bio); | |
813 | wait_for_completion(&event); | |
814 | ||
815 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
816 | bio_put(bio); | |
817 | return ret; | |
818 | } | |
a8745db2 | 819 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 820 | |
0002b271 | 821 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
822 | { |
823 | char b[BDEVNAME_SIZE]; | |
824 | if (!rdev->sb_page) { | |
825 | MD_BUG(); | |
826 | return -EINVAL; | |
827 | } | |
828 | if (rdev->sb_loaded) | |
829 | return 0; | |
830 | ||
831 | ||
2b193363 | 832 | if (!sync_page_io(rdev, rdev->sb_start, size, rdev->sb_page, READ)) |
1da177e4 LT |
833 | goto fail; |
834 | rdev->sb_loaded = 1; | |
835 | return 0; | |
836 | ||
837 | fail: | |
838 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
839 | bdevname(rdev->bdev,b)); | |
840 | return -EINVAL; | |
841 | } | |
842 | ||
843 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
844 | { | |
05710466 AN |
845 | return sb1->set_uuid0 == sb2->set_uuid0 && |
846 | sb1->set_uuid1 == sb2->set_uuid1 && | |
847 | sb1->set_uuid2 == sb2->set_uuid2 && | |
848 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
849 | } |
850 | ||
1da177e4 LT |
851 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
852 | { | |
853 | int ret; | |
854 | mdp_super_t *tmp1, *tmp2; | |
855 | ||
856 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
857 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
858 | ||
859 | if (!tmp1 || !tmp2) { | |
860 | ret = 0; | |
35020f1a | 861 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
862 | goto abort; |
863 | } | |
864 | ||
865 | *tmp1 = *sb1; | |
866 | *tmp2 = *sb2; | |
867 | ||
868 | /* | |
869 | * nr_disks is not constant | |
870 | */ | |
871 | tmp1->nr_disks = 0; | |
872 | tmp2->nr_disks = 0; | |
873 | ||
ce0c8e05 | 874 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 875 | abort: |
990a8baf JJ |
876 | kfree(tmp1); |
877 | kfree(tmp2); | |
1da177e4 LT |
878 | return ret; |
879 | } | |
880 | ||
4d167f09 N |
881 | |
882 | static u32 md_csum_fold(u32 csum) | |
883 | { | |
884 | csum = (csum & 0xffff) + (csum >> 16); | |
885 | return (csum & 0xffff) + (csum >> 16); | |
886 | } | |
887 | ||
1da177e4 LT |
888 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
889 | { | |
4d167f09 N |
890 | u64 newcsum = 0; |
891 | u32 *sb32 = (u32*)sb; | |
892 | int i; | |
1da177e4 LT |
893 | unsigned int disk_csum, csum; |
894 | ||
895 | disk_csum = sb->sb_csum; | |
896 | sb->sb_csum = 0; | |
4d167f09 N |
897 | |
898 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
899 | newcsum += sb32[i]; | |
900 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
901 | ||
902 | ||
903 | #ifdef CONFIG_ALPHA | |
904 | /* This used to use csum_partial, which was wrong for several | |
905 | * reasons including that different results are returned on | |
906 | * different architectures. It isn't critical that we get exactly | |
907 | * the same return value as before (we always csum_fold before | |
908 | * testing, and that removes any differences). However as we | |
909 | * know that csum_partial always returned a 16bit value on | |
910 | * alphas, do a fold to maximise conformity to previous behaviour. | |
911 | */ | |
912 | sb->sb_csum = md_csum_fold(disk_csum); | |
913 | #else | |
1da177e4 | 914 | sb->sb_csum = disk_csum; |
4d167f09 | 915 | #endif |
1da177e4 LT |
916 | return csum; |
917 | } | |
918 | ||
919 | ||
920 | /* | |
921 | * Handle superblock details. | |
922 | * We want to be able to handle multiple superblock formats | |
923 | * so we have a common interface to them all, and an array of | |
924 | * different handlers. | |
925 | * We rely on user-space to write the initial superblock, and support | |
926 | * reading and updating of superblocks. | |
927 | * Interface methods are: | |
928 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
929 | * loads and validates a superblock on dev. | |
930 | * if refdev != NULL, compare superblocks on both devices | |
931 | * Return: | |
932 | * 0 - dev has a superblock that is compatible with refdev | |
933 | * 1 - dev has a superblock that is compatible and newer than refdev | |
934 | * so dev should be used as the refdev in future | |
935 | * -EINVAL superblock incompatible or invalid | |
936 | * -othererror e.g. -EIO | |
937 | * | |
938 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
939 | * Verify that dev is acceptable into mddev. | |
940 | * The first time, mddev->raid_disks will be 0, and data from | |
941 | * dev should be merged in. Subsequent calls check that dev | |
942 | * is new enough. Return 0 or -EINVAL | |
943 | * | |
944 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
945 | * Update the superblock for rdev with data in mddev | |
946 | * This does not write to disc. | |
947 | * | |
948 | */ | |
949 | ||
950 | struct super_type { | |
0cd17fec CW |
951 | char *name; |
952 | struct module *owner; | |
953 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
954 | int minor_version); | |
955 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
956 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
957 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
15f4a5fd | 958 | sector_t num_sectors); |
1da177e4 LT |
959 | }; |
960 | ||
0894cc30 AN |
961 | /* |
962 | * Check that the given mddev has no bitmap. | |
963 | * | |
964 | * This function is called from the run method of all personalities that do not | |
965 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
966 | * has a bitmap. Otherwise, it returns 0. | |
967 | * | |
968 | */ | |
969 | int md_check_no_bitmap(mddev_t *mddev) | |
970 | { | |
c3d9714e | 971 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
972 | return 0; |
973 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
974 | mdname(mddev), mddev->pers->name); | |
975 | return 1; | |
976 | } | |
977 | EXPORT_SYMBOL(md_check_no_bitmap); | |
978 | ||
1da177e4 LT |
979 | /* |
980 | * load_super for 0.90.0 | |
981 | */ | |
982 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
983 | { | |
984 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
985 | mdp_super_t *sb; | |
986 | int ret; | |
1da177e4 LT |
987 | |
988 | /* | |
0f420358 | 989 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
990 | * it's at the end of the disk. |
991 | * | |
992 | * It also happens to be a multiple of 4Kb. | |
993 | */ | |
0f420358 | 994 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 995 | |
0002b271 | 996 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
997 | if (ret) return ret; |
998 | ||
999 | ret = -EINVAL; | |
1000 | ||
1001 | bdevname(rdev->bdev, b); | |
1002 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
1003 | ||
1004 | if (sb->md_magic != MD_SB_MAGIC) { | |
1005 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
1006 | b); | |
1007 | goto abort; | |
1008 | } | |
1009 | ||
1010 | if (sb->major_version != 0 || | |
f6705578 N |
1011 | sb->minor_version < 90 || |
1012 | sb->minor_version > 91) { | |
1da177e4 LT |
1013 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
1014 | sb->major_version, sb->minor_version, | |
1015 | b); | |
1016 | goto abort; | |
1017 | } | |
1018 | ||
1019 | if (sb->raid_disks <= 0) | |
1020 | goto abort; | |
1021 | ||
4d167f09 | 1022 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
1023 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
1024 | b); | |
1025 | goto abort; | |
1026 | } | |
1027 | ||
1028 | rdev->preferred_minor = sb->md_minor; | |
1029 | rdev->data_offset = 0; | |
0002b271 | 1030 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 LT |
1031 | |
1032 | if (sb->level == LEVEL_MULTIPATH) | |
1033 | rdev->desc_nr = -1; | |
1034 | else | |
1035 | rdev->desc_nr = sb->this_disk.number; | |
1036 | ||
9a7b2b0f | 1037 | if (!refdev) { |
1da177e4 | 1038 | ret = 1; |
9a7b2b0f | 1039 | } else { |
1da177e4 LT |
1040 | __u64 ev1, ev2; |
1041 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
1042 | if (!uuid_equal(refsb, sb)) { | |
1043 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
1044 | b, bdevname(refdev->bdev,b2)); | |
1045 | goto abort; | |
1046 | } | |
1047 | if (!sb_equal(refsb, sb)) { | |
1048 | printk(KERN_WARNING "md: %s has same UUID" | |
1049 | " but different superblock to %s\n", | |
1050 | b, bdevname(refdev->bdev, b2)); | |
1051 | goto abort; | |
1052 | } | |
1053 | ev1 = md_event(sb); | |
1054 | ev2 = md_event(refsb); | |
1055 | if (ev1 > ev2) | |
1056 | ret = 1; | |
1057 | else | |
1058 | ret = 0; | |
1059 | } | |
8190e754 | 1060 | rdev->sectors = rdev->sb_start; |
1da177e4 | 1061 | |
dd8ac336 | 1062 | if (rdev->sectors < sb->size * 2 && sb->level > 1) |
2bf071bf N |
1063 | /* "this cannot possibly happen" ... */ |
1064 | ret = -EINVAL; | |
1065 | ||
1da177e4 LT |
1066 | abort: |
1067 | return ret; | |
1068 | } | |
1069 | ||
1070 | /* | |
1071 | * validate_super for 0.90.0 | |
1072 | */ | |
1073 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1074 | { | |
1075 | mdp_disk_t *desc; | |
1076 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 1077 | __u64 ev1 = md_event(sb); |
1da177e4 | 1078 | |
41158c7e | 1079 | rdev->raid_disk = -1; |
c5d79adb N |
1080 | clear_bit(Faulty, &rdev->flags); |
1081 | clear_bit(In_sync, &rdev->flags); | |
1082 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1083 | |
1da177e4 LT |
1084 | if (mddev->raid_disks == 0) { |
1085 | mddev->major_version = 0; | |
1086 | mddev->minor_version = sb->minor_version; | |
1087 | mddev->patch_version = sb->patch_version; | |
e691063a | 1088 | mddev->external = 0; |
9d8f0363 | 1089 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1090 | mddev->ctime = sb->ctime; |
1091 | mddev->utime = sb->utime; | |
1092 | mddev->level = sb->level; | |
d9d166c2 | 1093 | mddev->clevel[0] = 0; |
1da177e4 LT |
1094 | mddev->layout = sb->layout; |
1095 | mddev->raid_disks = sb->raid_disks; | |
58c0fed4 | 1096 | mddev->dev_sectors = sb->size * 2; |
07d84d10 | 1097 | mddev->events = ev1; |
c3d9714e N |
1098 | mddev->bitmap_info.offset = 0; |
1099 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; | |
1da177e4 | 1100 | |
f6705578 N |
1101 | if (mddev->minor_version >= 91) { |
1102 | mddev->reshape_position = sb->reshape_position; | |
1103 | mddev->delta_disks = sb->delta_disks; | |
1104 | mddev->new_level = sb->new_level; | |
1105 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1106 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
f6705578 N |
1107 | } else { |
1108 | mddev->reshape_position = MaxSector; | |
1109 | mddev->delta_disks = 0; | |
1110 | mddev->new_level = mddev->level; | |
1111 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1112 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1113 | } |
1114 | ||
1da177e4 LT |
1115 | if (sb->state & (1<<MD_SB_CLEAN)) |
1116 | mddev->recovery_cp = MaxSector; | |
1117 | else { | |
1118 | if (sb->events_hi == sb->cp_events_hi && | |
1119 | sb->events_lo == sb->cp_events_lo) { | |
1120 | mddev->recovery_cp = sb->recovery_cp; | |
1121 | } else | |
1122 | mddev->recovery_cp = 0; | |
1123 | } | |
1124 | ||
1125 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1126 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1127 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1128 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1129 | ||
1130 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1131 | |
1132 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
c3d9714e N |
1133 | mddev->bitmap_info.file == NULL) |
1134 | mddev->bitmap_info.offset = | |
1135 | mddev->bitmap_info.default_offset; | |
a654b9d8 | 1136 | |
41158c7e | 1137 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1138 | /* Insist on good event counter while assembling, except |
1139 | * for spares (which don't need an event count) */ | |
1da177e4 | 1140 | ++ev1; |
be6800a7 N |
1141 | if (sb->disks[rdev->desc_nr].state & ( |
1142 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
1143 | if (ev1 < mddev->events) | |
1144 | return -EINVAL; | |
41158c7e N |
1145 | } else if (mddev->bitmap) { |
1146 | /* if adding to array with a bitmap, then we can accept an | |
1147 | * older device ... but not too old. | |
1148 | */ | |
41158c7e N |
1149 | if (ev1 < mddev->bitmap->events_cleared) |
1150 | return 0; | |
07d84d10 N |
1151 | } else { |
1152 | if (ev1 < mddev->events) | |
1153 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1154 | return 0; | |
1155 | } | |
41158c7e | 1156 | |
1da177e4 | 1157 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1158 | desc = sb->disks + rdev->desc_nr; |
1159 | ||
1160 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1161 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1162 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1163 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1164 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1165 | rdev->raid_disk = desc->raid_disk; |
0261cd9f N |
1166 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1167 | /* active but not in sync implies recovery up to | |
1168 | * reshape position. We don't know exactly where | |
1169 | * that is, so set to zero for now */ | |
1170 | if (mddev->minor_version >= 91) { | |
1171 | rdev->recovery_offset = 0; | |
1172 | rdev->raid_disk = desc->raid_disk; | |
1173 | } | |
1da177e4 | 1174 | } |
8ddf9efe N |
1175 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1176 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1177 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1178 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1179 | return 0; |
1180 | } | |
1181 | ||
1182 | /* | |
1183 | * sync_super for 0.90.0 | |
1184 | */ | |
1185 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1186 | { | |
1187 | mdp_super_t *sb; | |
1da177e4 LT |
1188 | mdk_rdev_t *rdev2; |
1189 | int next_spare = mddev->raid_disks; | |
19133a42 | 1190 | |
1da177e4 LT |
1191 | |
1192 | /* make rdev->sb match mddev data.. | |
1193 | * | |
1194 | * 1/ zero out disks | |
1195 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1196 | * 3/ any empty disks < next_spare become removed | |
1197 | * | |
1198 | * disks[0] gets initialised to REMOVED because | |
1199 | * we cannot be sure from other fields if it has | |
1200 | * been initialised or not. | |
1201 | */ | |
1202 | int i; | |
1203 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1204 | ||
61181565 N |
1205 | rdev->sb_size = MD_SB_BYTES; |
1206 | ||
1da177e4 LT |
1207 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
1208 | ||
1209 | memset(sb, 0, sizeof(*sb)); | |
1210 | ||
1211 | sb->md_magic = MD_SB_MAGIC; | |
1212 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1213 | sb->patch_version = mddev->patch_version; |
1214 | sb->gvalid_words = 0; /* ignored */ | |
1215 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1216 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1217 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1218 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1219 | ||
1220 | sb->ctime = mddev->ctime; | |
1221 | sb->level = mddev->level; | |
58c0fed4 | 1222 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1223 | sb->raid_disks = mddev->raid_disks; |
1224 | sb->md_minor = mddev->md_minor; | |
e691063a | 1225 | sb->not_persistent = 0; |
1da177e4 LT |
1226 | sb->utime = mddev->utime; |
1227 | sb->state = 0; | |
1228 | sb->events_hi = (mddev->events>>32); | |
1229 | sb->events_lo = (u32)mddev->events; | |
1230 | ||
f6705578 N |
1231 | if (mddev->reshape_position == MaxSector) |
1232 | sb->minor_version = 90; | |
1233 | else { | |
1234 | sb->minor_version = 91; | |
1235 | sb->reshape_position = mddev->reshape_position; | |
1236 | sb->new_level = mddev->new_level; | |
1237 | sb->delta_disks = mddev->delta_disks; | |
1238 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1239 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1240 | } |
1241 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1242 | if (mddev->in_sync) |
1243 | { | |
1244 | sb->recovery_cp = mddev->recovery_cp; | |
1245 | sb->cp_events_hi = (mddev->events>>32); | |
1246 | sb->cp_events_lo = (u32)mddev->events; | |
1247 | if (mddev->recovery_cp == MaxSector) | |
1248 | sb->state = (1<< MD_SB_CLEAN); | |
1249 | } else | |
1250 | sb->recovery_cp = 0; | |
1251 | ||
1252 | sb->layout = mddev->layout; | |
9d8f0363 | 1253 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1254 | |
c3d9714e | 1255 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1256 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1257 | ||
1da177e4 | 1258 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
159ec1fc | 1259 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1260 | mdp_disk_t *d; |
86e6ffdd | 1261 | int desc_nr; |
0261cd9f N |
1262 | int is_active = test_bit(In_sync, &rdev2->flags); |
1263 | ||
1264 | if (rdev2->raid_disk >= 0 && | |
1265 | sb->minor_version >= 91) | |
1266 | /* we have nowhere to store the recovery_offset, | |
1267 | * but if it is not below the reshape_position, | |
1268 | * we can piggy-back on that. | |
1269 | */ | |
1270 | is_active = 1; | |
1271 | if (rdev2->raid_disk < 0 || | |
1272 | test_bit(Faulty, &rdev2->flags)) | |
1273 | is_active = 0; | |
1274 | if (is_active) | |
86e6ffdd | 1275 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1276 | else |
86e6ffdd | 1277 | desc_nr = next_spare++; |
19133a42 | 1278 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1279 | d = &sb->disks[rdev2->desc_nr]; |
1280 | nr_disks++; | |
1281 | d->number = rdev2->desc_nr; | |
1282 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1283 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1284 | if (is_active) |
1da177e4 LT |
1285 | d->raid_disk = rdev2->raid_disk; |
1286 | else | |
1287 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1288 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1289 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1290 | else if (is_active) { |
1da177e4 | 1291 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1292 | if (test_bit(In_sync, &rdev2->flags)) |
1293 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1294 | active++; |
1295 | working++; | |
1296 | } else { | |
1297 | d->state = 0; | |
1298 | spare++; | |
1299 | working++; | |
1300 | } | |
8ddf9efe N |
1301 | if (test_bit(WriteMostly, &rdev2->flags)) |
1302 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1303 | } |
1da177e4 LT |
1304 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1305 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1306 | mdp_disk_t *d = &sb->disks[i]; | |
1307 | if (d->state == 0 && d->number == 0) { | |
1308 | d->number = i; | |
1309 | d->raid_disk = i; | |
1310 | d->state = (1<<MD_DISK_REMOVED); | |
1311 | d->state |= (1<<MD_DISK_FAULTY); | |
1312 | failed++; | |
1313 | } | |
1314 | } | |
1315 | sb->nr_disks = nr_disks; | |
1316 | sb->active_disks = active; | |
1317 | sb->working_disks = working; | |
1318 | sb->failed_disks = failed; | |
1319 | sb->spare_disks = spare; | |
1320 | ||
1321 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1322 | sb->sb_csum = calc_sb_csum(sb); | |
1323 | } | |
1324 | ||
0cd17fec CW |
1325 | /* |
1326 | * rdev_size_change for 0.90.0 | |
1327 | */ | |
1328 | static unsigned long long | |
15f4a5fd | 1329 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec | 1330 | { |
58c0fed4 | 1331 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1332 | return 0; /* component must fit device */ |
c3d9714e | 1333 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1334 | return 0; /* can't move bitmap */ |
0f420358 | 1335 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
15f4a5fd AN |
1336 | if (!num_sectors || num_sectors > rdev->sb_start) |
1337 | num_sectors = rdev->sb_start; | |
0f420358 | 1338 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1339 | rdev->sb_page); |
1340 | md_super_wait(rdev->mddev); | |
c26a44ed | 1341 | return num_sectors; |
0cd17fec CW |
1342 | } |
1343 | ||
1344 | ||
1da177e4 LT |
1345 | /* |
1346 | * version 1 superblock | |
1347 | */ | |
1348 | ||
1c05b4bc | 1349 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1350 | { |
1c05b4bc N |
1351 | __le32 disk_csum; |
1352 | u32 csum; | |
1da177e4 LT |
1353 | unsigned long long newcsum; |
1354 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1355 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1356 | int i; |
1357 | ||
1358 | disk_csum = sb->sb_csum; | |
1359 | sb->sb_csum = 0; | |
1360 | newcsum = 0; | |
1361 | for (i=0; size>=4; size -= 4 ) | |
1362 | newcsum += le32_to_cpu(*isuper++); | |
1363 | ||
1364 | if (size == 2) | |
1c05b4bc | 1365 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1366 | |
1367 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1368 | sb->sb_csum = disk_csum; | |
1369 | return cpu_to_le32(csum); | |
1370 | } | |
1371 | ||
1372 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1373 | { | |
1374 | struct mdp_superblock_1 *sb; | |
1375 | int ret; | |
0f420358 | 1376 | sector_t sb_start; |
1da177e4 | 1377 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1378 | int bmask; |
1da177e4 LT |
1379 | |
1380 | /* | |
0f420358 | 1381 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1382 | * It is always aligned to a 4K boundary and |
1383 | * depeding on minor_version, it can be: | |
1384 | * 0: At least 8K, but less than 12K, from end of device | |
1385 | * 1: At start of device | |
1386 | * 2: 4K from start of device. | |
1387 | */ | |
1388 | switch(minor_version) { | |
1389 | case 0: | |
77304d2a | 1390 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
0f420358 AN |
1391 | sb_start -= 8*2; |
1392 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1393 | break; |
1394 | case 1: | |
0f420358 | 1395 | sb_start = 0; |
1da177e4 LT |
1396 | break; |
1397 | case 2: | |
0f420358 | 1398 | sb_start = 8; |
1da177e4 LT |
1399 | break; |
1400 | default: | |
1401 | return -EINVAL; | |
1402 | } | |
0f420358 | 1403 | rdev->sb_start = sb_start; |
1da177e4 | 1404 | |
0002b271 N |
1405 | /* superblock is rarely larger than 1K, but it can be larger, |
1406 | * and it is safe to read 4k, so we do that | |
1407 | */ | |
1408 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1409 | if (ret) return ret; |
1410 | ||
1411 | ||
1412 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1413 | ||
1414 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1415 | sb->major_version != cpu_to_le32(1) || | |
1416 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1417 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1418 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1419 | return -EINVAL; |
1420 | ||
1421 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1422 | printk("md: invalid superblock checksum on %s\n", | |
1423 | bdevname(rdev->bdev,b)); | |
1424 | return -EINVAL; | |
1425 | } | |
1426 | if (le64_to_cpu(sb->data_size) < 10) { | |
1427 | printk("md: data_size too small on %s\n", | |
1428 | bdevname(rdev->bdev,b)); | |
1429 | return -EINVAL; | |
1430 | } | |
e11e93fa | 1431 | |
1da177e4 LT |
1432 | rdev->preferred_minor = 0xffff; |
1433 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1434 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1435 | |
0002b271 | 1436 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1437 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1438 | if (rdev->sb_size & bmask) |
a1801f85 N |
1439 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1440 | ||
1441 | if (minor_version | |
0f420358 | 1442 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1443 | return -EINVAL; |
0002b271 | 1444 | |
31b65a0d N |
1445 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1446 | rdev->desc_nr = -1; | |
1447 | else | |
1448 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1449 | ||
9a7b2b0f | 1450 | if (!refdev) { |
8ed75463 | 1451 | ret = 1; |
9a7b2b0f | 1452 | } else { |
1da177e4 LT |
1453 | __u64 ev1, ev2; |
1454 | struct mdp_superblock_1 *refsb = | |
1455 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1456 | ||
1457 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1458 | sb->level != refsb->level || | |
1459 | sb->layout != refsb->layout || | |
1460 | sb->chunksize != refsb->chunksize) { | |
1461 | printk(KERN_WARNING "md: %s has strangely different" | |
1462 | " superblock to %s\n", | |
1463 | bdevname(rdev->bdev,b), | |
1464 | bdevname(refdev->bdev,b2)); | |
1465 | return -EINVAL; | |
1466 | } | |
1467 | ev1 = le64_to_cpu(sb->events); | |
1468 | ev2 = le64_to_cpu(refsb->events); | |
1469 | ||
1470 | if (ev1 > ev2) | |
8ed75463 N |
1471 | ret = 1; |
1472 | else | |
1473 | ret = 0; | |
1da177e4 | 1474 | } |
a1801f85 | 1475 | if (minor_version) |
77304d2a | 1476 | rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 1477 | le64_to_cpu(sb->data_offset); |
1da177e4 | 1478 | else |
dd8ac336 AN |
1479 | rdev->sectors = rdev->sb_start; |
1480 | if (rdev->sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1481 | return -EINVAL; |
dd8ac336 | 1482 | rdev->sectors = le64_to_cpu(sb->data_size); |
dd8ac336 | 1483 | if (le64_to_cpu(sb->size) > rdev->sectors) |
2bf071bf | 1484 | return -EINVAL; |
8ed75463 | 1485 | return ret; |
1da177e4 LT |
1486 | } |
1487 | ||
1488 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1489 | { | |
1490 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1491 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1492 | |
41158c7e | 1493 | rdev->raid_disk = -1; |
c5d79adb N |
1494 | clear_bit(Faulty, &rdev->flags); |
1495 | clear_bit(In_sync, &rdev->flags); | |
1496 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1497 | |
1da177e4 LT |
1498 | if (mddev->raid_disks == 0) { |
1499 | mddev->major_version = 1; | |
1500 | mddev->patch_version = 0; | |
e691063a | 1501 | mddev->external = 0; |
9d8f0363 | 1502 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1503 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1504 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1505 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1506 | mddev->clevel[0] = 0; |
1da177e4 LT |
1507 | mddev->layout = le32_to_cpu(sb->layout); |
1508 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1509 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1510 | mddev->events = ev1; |
c3d9714e N |
1511 | mddev->bitmap_info.offset = 0; |
1512 | mddev->bitmap_info.default_offset = 1024 >> 9; | |
1da177e4 LT |
1513 | |
1514 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1515 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1516 | ||
1517 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1518 | |
71c0805c | 1519 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
c3d9714e N |
1520 | mddev->bitmap_info.file == NULL ) |
1521 | mddev->bitmap_info.offset = | |
1522 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
e11e93fa | 1523 | |
f6705578 N |
1524 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1525 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1526 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1527 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1528 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1529 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
f6705578 N |
1530 | } else { |
1531 | mddev->reshape_position = MaxSector; | |
1532 | mddev->delta_disks = 0; | |
1533 | mddev->new_level = mddev->level; | |
1534 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1535 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1536 | } |
1537 | ||
41158c7e | 1538 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1539 | /* Insist of good event counter while assembling, except for |
1540 | * spares (which don't need an event count) */ | |
1da177e4 | 1541 | ++ev1; |
be6800a7 N |
1542 | if (rdev->desc_nr >= 0 && |
1543 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
1544 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) | |
1545 | if (ev1 < mddev->events) | |
1546 | return -EINVAL; | |
41158c7e N |
1547 | } else if (mddev->bitmap) { |
1548 | /* If adding to array with a bitmap, then we can accept an | |
1549 | * older device, but not too old. | |
1550 | */ | |
41158c7e N |
1551 | if (ev1 < mddev->bitmap->events_cleared) |
1552 | return 0; | |
07d84d10 N |
1553 | } else { |
1554 | if (ev1 < mddev->events) | |
1555 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1556 | return 0; | |
1557 | } | |
1da177e4 LT |
1558 | if (mddev->level != LEVEL_MULTIPATH) { |
1559 | int role; | |
3673f305 N |
1560 | if (rdev->desc_nr < 0 || |
1561 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1562 | role = 0xffff; | |
1563 | rdev->desc_nr = -1; | |
1564 | } else | |
1565 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1566 | switch(role) { |
1567 | case 0xffff: /* spare */ | |
1da177e4 LT |
1568 | break; |
1569 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1570 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1571 | break; |
1572 | default: | |
5fd6c1dc N |
1573 | if ((le32_to_cpu(sb->feature_map) & |
1574 | MD_FEATURE_RECOVERY_OFFSET)) | |
1575 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1576 | else | |
1577 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1578 | rdev->raid_disk = role; |
1579 | break; | |
1580 | } | |
8ddf9efe N |
1581 | if (sb->devflags & WriteMostly1) |
1582 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1583 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1584 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1585 | |
1da177e4 LT |
1586 | return 0; |
1587 | } | |
1588 | ||
1589 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1590 | { | |
1591 | struct mdp_superblock_1 *sb; | |
1da177e4 LT |
1592 | mdk_rdev_t *rdev2; |
1593 | int max_dev, i; | |
1594 | /* make rdev->sb match mddev and rdev data. */ | |
1595 | ||
1596 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1597 | ||
1598 | sb->feature_map = 0; | |
1599 | sb->pad0 = 0; | |
5fd6c1dc | 1600 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1601 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1602 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1603 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1604 | ||
1605 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1606 | sb->events = cpu_to_le64(mddev->events); | |
1607 | if (mddev->in_sync) | |
1608 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1609 | else | |
1610 | sb->resync_offset = cpu_to_le64(0); | |
1611 | ||
1c05b4bc | 1612 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1613 | |
f0ca340c | 1614 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1615 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1616 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1617 | sb->level = cpu_to_le32(mddev->level); |
1618 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1619 | |
c3d9714e N |
1620 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1621 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1622 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1623 | } |
5fd6c1dc N |
1624 | |
1625 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1626 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1627 | sb->feature_map |= |
1628 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1629 | sb->recovery_offset = | |
1630 | cpu_to_le64(rdev->recovery_offset); | |
5fd6c1dc N |
1631 | } |
1632 | ||
f6705578 N |
1633 | if (mddev->reshape_position != MaxSector) { |
1634 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1635 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1636 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1637 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1638 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1639 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
f6705578 | 1640 | } |
a654b9d8 | 1641 | |
1da177e4 | 1642 | max_dev = 0; |
159ec1fc | 1643 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
1da177e4 LT |
1644 | if (rdev2->desc_nr+1 > max_dev) |
1645 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1646 | |
70471daf N |
1647 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1648 | int bmask; | |
a778b73f | 1649 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1650 | rdev->sb_size = max_dev * 2 + 256; |
1651 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1652 | if (rdev->sb_size & bmask) | |
1653 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1654 | } else |
1655 | max_dev = le32_to_cpu(sb->max_dev); | |
1656 | ||
1da177e4 LT |
1657 | for (i=0; i<max_dev;i++) |
1658 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1659 | ||
159ec1fc | 1660 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1661 | i = rdev2->desc_nr; |
b2d444d7 | 1662 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1663 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1664 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1665 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1666 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1667 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1668 | else |
1669 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1670 | } | |
1671 | ||
1da177e4 LT |
1672 | sb->sb_csum = calc_sb_1_csum(sb); |
1673 | } | |
1674 | ||
0cd17fec | 1675 | static unsigned long long |
15f4a5fd | 1676 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec CW |
1677 | { |
1678 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1679 | sector_t max_sectors; |
58c0fed4 | 1680 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1681 | return 0; /* component must fit device */ |
0f420358 | 1682 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1683 | /* minor versions 1 and 2; superblock before data */ |
77304d2a | 1684 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
15f4a5fd AN |
1685 | max_sectors -= rdev->data_offset; |
1686 | if (!num_sectors || num_sectors > max_sectors) | |
1687 | num_sectors = max_sectors; | |
c3d9714e | 1688 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1689 | /* minor version 0 with bitmap we can't move */ |
1690 | return 0; | |
1691 | } else { | |
1692 | /* minor version 0; superblock after data */ | |
0f420358 | 1693 | sector_t sb_start; |
77304d2a | 1694 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
0f420358 | 1695 | sb_start &= ~(sector_t)(4*2 - 1); |
dd8ac336 | 1696 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1697 | if (!num_sectors || num_sectors > max_sectors) |
1698 | num_sectors = max_sectors; | |
0f420358 | 1699 | rdev->sb_start = sb_start; |
0cd17fec CW |
1700 | } |
1701 | sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); | |
15f4a5fd | 1702 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1703 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1704 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1705 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1706 | rdev->sb_page); |
1707 | md_super_wait(rdev->mddev); | |
c26a44ed | 1708 | return num_sectors; |
0cd17fec | 1709 | } |
1da177e4 | 1710 | |
75c96f85 | 1711 | static struct super_type super_types[] = { |
1da177e4 LT |
1712 | [0] = { |
1713 | .name = "0.90.0", | |
1714 | .owner = THIS_MODULE, | |
0cd17fec CW |
1715 | .load_super = super_90_load, |
1716 | .validate_super = super_90_validate, | |
1717 | .sync_super = super_90_sync, | |
1718 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1719 | }, |
1720 | [1] = { | |
1721 | .name = "md-1", | |
1722 | .owner = THIS_MODULE, | |
0cd17fec CW |
1723 | .load_super = super_1_load, |
1724 | .validate_super = super_1_validate, | |
1725 | .sync_super = super_1_sync, | |
1726 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1727 | }, |
1728 | }; | |
1da177e4 LT |
1729 | |
1730 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1731 | { | |
7dd5e7c3 | 1732 | mdk_rdev_t *rdev, *rdev2; |
1da177e4 | 1733 | |
4b80991c N |
1734 | rcu_read_lock(); |
1735 | rdev_for_each_rcu(rdev, mddev1) | |
1736 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1737 | if (rdev->bdev->bd_contains == |
4b80991c N |
1738 | rdev2->bdev->bd_contains) { |
1739 | rcu_read_unlock(); | |
7dd5e7c3 | 1740 | return 1; |
4b80991c N |
1741 | } |
1742 | rcu_read_unlock(); | |
1da177e4 LT |
1743 | return 0; |
1744 | } | |
1745 | ||
1746 | static LIST_HEAD(pending_raid_disks); | |
1747 | ||
ac5e7113 AN |
1748 | /* |
1749 | * Try to register data integrity profile for an mddev | |
1750 | * | |
1751 | * This is called when an array is started and after a disk has been kicked | |
1752 | * from the array. It only succeeds if all working and active component devices | |
1753 | * are integrity capable with matching profiles. | |
1754 | */ | |
1755 | int md_integrity_register(mddev_t *mddev) | |
1756 | { | |
1757 | mdk_rdev_t *rdev, *reference = NULL; | |
1758 | ||
1759 | if (list_empty(&mddev->disks)) | |
1760 | return 0; /* nothing to do */ | |
1761 | if (blk_get_integrity(mddev->gendisk)) | |
1762 | return 0; /* already registered */ | |
1763 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
1764 | /* skip spares and non-functional disks */ | |
1765 | if (test_bit(Faulty, &rdev->flags)) | |
1766 | continue; | |
1767 | if (rdev->raid_disk < 0) | |
1768 | continue; | |
1769 | /* | |
1770 | * If at least one rdev is not integrity capable, we can not | |
1771 | * enable data integrity for the md device. | |
1772 | */ | |
1773 | if (!bdev_get_integrity(rdev->bdev)) | |
1774 | return -EINVAL; | |
1775 | if (!reference) { | |
1776 | /* Use the first rdev as the reference */ | |
1777 | reference = rdev; | |
1778 | continue; | |
1779 | } | |
1780 | /* does this rdev's profile match the reference profile? */ | |
1781 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1782 | rdev->bdev->bd_disk) < 0) | |
1783 | return -EINVAL; | |
1784 | } | |
1785 | /* | |
1786 | * All component devices are integrity capable and have matching | |
1787 | * profiles, register the common profile for the md device. | |
1788 | */ | |
1789 | if (blk_integrity_register(mddev->gendisk, | |
1790 | bdev_get_integrity(reference->bdev)) != 0) { | |
1791 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1792 | mdname(mddev)); | |
1793 | return -EINVAL; | |
1794 | } | |
1795 | printk(KERN_NOTICE "md: data integrity on %s enabled\n", | |
1796 | mdname(mddev)); | |
1797 | return 0; | |
1798 | } | |
1799 | EXPORT_SYMBOL(md_integrity_register); | |
1800 | ||
1801 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
1802 | void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev) | |
3f9d99c1 | 1803 | { |
3f9d99c1 | 1804 | struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); |
ac5e7113 | 1805 | struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk); |
3f9d99c1 | 1806 | |
ac5e7113 | 1807 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 1808 | return; |
ac5e7113 | 1809 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 1810 | return; |
ac5e7113 AN |
1811 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
1812 | rdev->bdev->bd_disk) >= 0) | |
1813 | return; | |
1814 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
1815 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 1816 | } |
ac5e7113 | 1817 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 1818 | |
1da177e4 LT |
1819 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) |
1820 | { | |
7dd5e7c3 | 1821 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1822 | struct kobject *ko; |
1edf80d3 | 1823 | char *s; |
5e55e2f5 | 1824 | int err; |
1da177e4 LT |
1825 | |
1826 | if (rdev->mddev) { | |
1827 | MD_BUG(); | |
1828 | return -EINVAL; | |
1829 | } | |
11e2ede0 DW |
1830 | |
1831 | /* prevent duplicates */ | |
1832 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
1833 | return -EEXIST; | |
1834 | ||
dd8ac336 AN |
1835 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
1836 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
1837 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
1838 | if (mddev->pers) { |
1839 | /* Cannot change size, so fail | |
1840 | * If mddev->level <= 0, then we don't care | |
1841 | * about aligning sizes (e.g. linear) | |
1842 | */ | |
1843 | if (mddev->level > 0) | |
1844 | return -ENOSPC; | |
1845 | } else | |
dd8ac336 | 1846 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 1847 | } |
1da177e4 LT |
1848 | |
1849 | /* Verify rdev->desc_nr is unique. | |
1850 | * If it is -1, assign a free number, else | |
1851 | * check number is not in use | |
1852 | */ | |
1853 | if (rdev->desc_nr < 0) { | |
1854 | int choice = 0; | |
1855 | if (mddev->pers) choice = mddev->raid_disks; | |
1856 | while (find_rdev_nr(mddev, choice)) | |
1857 | choice++; | |
1858 | rdev->desc_nr = choice; | |
1859 | } else { | |
1860 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1861 | return -EBUSY; | |
1862 | } | |
de01dfad N |
1863 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
1864 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
1865 | mdname(mddev), mddev->max_disks); | |
1866 | return -EBUSY; | |
1867 | } | |
19133a42 | 1868 | bdevname(rdev->bdev,b); |
649316b2 | 1869 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1870 | *s = '!'; |
649316b2 | 1871 | |
1da177e4 | 1872 | rdev->mddev = mddev; |
19133a42 | 1873 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1874 | |
b2d6db58 | 1875 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1876 | goto fail; |
86e6ffdd | 1877 | |
0762b8bd | 1878 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
1879 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
1880 | /* failure here is OK */; | |
1881 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 1882 | |
4b80991c | 1883 | list_add_rcu(&rdev->same_set, &mddev->disks); |
c5d79adb | 1884 | bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); |
4044ba58 N |
1885 | |
1886 | /* May as well allow recovery to be retried once */ | |
1887 | mddev->recovery_disabled = 0; | |
3f9d99c1 | 1888 | |
1da177e4 | 1889 | return 0; |
5e55e2f5 N |
1890 | |
1891 | fail: | |
1892 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1893 | b, mdname(mddev)); | |
1894 | return err; | |
1da177e4 LT |
1895 | } |
1896 | ||
177a99b2 | 1897 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
1898 | { |
1899 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1900 | kobject_del(&rdev->kobj); | |
177a99b2 | 1901 | kobject_put(&rdev->kobj); |
5792a285 N |
1902 | } |
1903 | ||
1da177e4 LT |
1904 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1905 | { | |
1906 | char b[BDEVNAME_SIZE]; | |
1907 | if (!rdev->mddev) { | |
1908 | MD_BUG(); | |
1909 | return; | |
1910 | } | |
5463c790 | 1911 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 1912 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
1913 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
1914 | rdev->mddev = NULL; | |
86e6ffdd | 1915 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
1916 | sysfs_put(rdev->sysfs_state); |
1917 | rdev->sysfs_state = NULL; | |
5792a285 | 1918 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
1919 | * writing to 'remove' to "dev/state". We also need |
1920 | * to delay it due to rcu usage. | |
5792a285 | 1921 | */ |
4b80991c | 1922 | synchronize_rcu(); |
177a99b2 N |
1923 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
1924 | kobject_get(&rdev->kobj); | |
e804ac78 | 1925 | queue_work(md_misc_wq, &rdev->del_work); |
1da177e4 LT |
1926 | } |
1927 | ||
1928 | /* | |
1929 | * prevent the device from being mounted, repartitioned or | |
1930 | * otherwise reused by a RAID array (or any other kernel | |
1931 | * subsystem), by bd_claiming the device. | |
1932 | */ | |
c5d79adb | 1933 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
1934 | { |
1935 | int err = 0; | |
1936 | struct block_device *bdev; | |
1937 | char b[BDEVNAME_SIZE]; | |
1938 | ||
2e7b651d | 1939 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1940 | if (IS_ERR(bdev)) { |
1941 | printk(KERN_ERR "md: could not open %s.\n", | |
1942 | __bdevname(dev, b)); | |
1943 | return PTR_ERR(bdev); | |
1944 | } | |
c5d79adb | 1945 | err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); |
1da177e4 LT |
1946 | if (err) { |
1947 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1948 | bdevname(bdev, b)); | |
9a1c3542 | 1949 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1950 | return err; |
1951 | } | |
c5d79adb N |
1952 | if (!shared) |
1953 | set_bit(AllReserved, &rdev->flags); | |
1da177e4 LT |
1954 | rdev->bdev = bdev; |
1955 | return err; | |
1956 | } | |
1957 | ||
1958 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1959 | { | |
1960 | struct block_device *bdev = rdev->bdev; | |
1961 | rdev->bdev = NULL; | |
1962 | if (!bdev) | |
1963 | MD_BUG(); | |
1964 | bd_release(bdev); | |
9a1c3542 | 1965 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1966 | } |
1967 | ||
1968 | void md_autodetect_dev(dev_t dev); | |
1969 | ||
1970 | static void export_rdev(mdk_rdev_t * rdev) | |
1971 | { | |
1972 | char b[BDEVNAME_SIZE]; | |
1973 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1974 | bdevname(rdev->bdev,b)); | |
1975 | if (rdev->mddev) | |
1976 | MD_BUG(); | |
1977 | free_disk_sb(rdev); | |
1da177e4 | 1978 | #ifndef MODULE |
d0fae18f N |
1979 | if (test_bit(AutoDetected, &rdev->flags)) |
1980 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
1981 | #endif |
1982 | unlock_rdev(rdev); | |
86e6ffdd | 1983 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1984 | } |
1985 | ||
1986 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1987 | { | |
1988 | unbind_rdev_from_array(rdev); | |
1989 | export_rdev(rdev); | |
1990 | } | |
1991 | ||
1992 | static void export_array(mddev_t *mddev) | |
1993 | { | |
159ec1fc | 1994 | mdk_rdev_t *rdev, *tmp; |
1da177e4 | 1995 | |
d089c6af | 1996 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1997 | if (!rdev->mddev) { |
1998 | MD_BUG(); | |
1999 | continue; | |
2000 | } | |
2001 | kick_rdev_from_array(rdev); | |
2002 | } | |
2003 | if (!list_empty(&mddev->disks)) | |
2004 | MD_BUG(); | |
2005 | mddev->raid_disks = 0; | |
2006 | mddev->major_version = 0; | |
2007 | } | |
2008 | ||
2009 | static void print_desc(mdp_disk_t *desc) | |
2010 | { | |
2011 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
2012 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
2013 | } | |
2014 | ||
cd2ac932 | 2015 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
2016 | { |
2017 | int i; | |
2018 | ||
2019 | printk(KERN_INFO | |
2020 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
2021 | sb->major_version, sb->minor_version, sb->patch_version, | |
2022 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
2023 | sb->ctime); | |
2024 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
2025 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
2026 | sb->md_minor, sb->layout, sb->chunk_size); | |
2027 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
2028 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
2029 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
2030 | sb->failed_disks, sb->spare_disks, | |
2031 | sb->sb_csum, (unsigned long)sb->events_lo); | |
2032 | ||
2033 | printk(KERN_INFO); | |
2034 | for (i = 0; i < MD_SB_DISKS; i++) { | |
2035 | mdp_disk_t *desc; | |
2036 | ||
2037 | desc = sb->disks + i; | |
2038 | if (desc->number || desc->major || desc->minor || | |
2039 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
2040 | printk(" D %2d: ", i); | |
2041 | print_desc(desc); | |
2042 | } | |
2043 | } | |
2044 | printk(KERN_INFO "md: THIS: "); | |
2045 | print_desc(&sb->this_disk); | |
cd2ac932 | 2046 | } |
1da177e4 | 2047 | |
cd2ac932 CR |
2048 | static void print_sb_1(struct mdp_superblock_1 *sb) |
2049 | { | |
2050 | __u8 *uuid; | |
2051 | ||
2052 | uuid = sb->set_uuid; | |
ad361c98 | 2053 | printk(KERN_INFO |
7b75c2f8 | 2054 | "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n" |
ad361c98 | 2055 | "md: Name: \"%s\" CT:%llu\n", |
cd2ac932 CR |
2056 | le32_to_cpu(sb->major_version), |
2057 | le32_to_cpu(sb->feature_map), | |
7b75c2f8 | 2058 | uuid, |
cd2ac932 CR |
2059 | sb->set_name, |
2060 | (unsigned long long)le64_to_cpu(sb->ctime) | |
2061 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
2062 | ||
2063 | uuid = sb->device_uuid; | |
ad361c98 JP |
2064 | printk(KERN_INFO |
2065 | "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
cd2ac932 | 2066 | " RO:%llu\n" |
7b75c2f8 | 2067 | "md: Dev:%08x UUID: %pU\n" |
ad361c98 JP |
2068 | "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" |
2069 | "md: (MaxDev:%u) \n", | |
cd2ac932 CR |
2070 | le32_to_cpu(sb->level), |
2071 | (unsigned long long)le64_to_cpu(sb->size), | |
2072 | le32_to_cpu(sb->raid_disks), | |
2073 | le32_to_cpu(sb->layout), | |
2074 | le32_to_cpu(sb->chunksize), | |
2075 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
2076 | (unsigned long long)le64_to_cpu(sb->data_size), | |
2077 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
2078 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
2079 | le32_to_cpu(sb->dev_number), | |
7b75c2f8 | 2080 | uuid, |
cd2ac932 CR |
2081 | sb->devflags, |
2082 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
2083 | (unsigned long long)le64_to_cpu(sb->events), | |
2084 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
2085 | le32_to_cpu(sb->sb_csum), | |
2086 | le32_to_cpu(sb->max_dev) | |
2087 | ); | |
1da177e4 LT |
2088 | } |
2089 | ||
cd2ac932 | 2090 | static void print_rdev(mdk_rdev_t *rdev, int major_version) |
1da177e4 LT |
2091 | { |
2092 | char b[BDEVNAME_SIZE]; | |
dd8ac336 AN |
2093 | printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", |
2094 | bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, | |
b2d444d7 N |
2095 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
2096 | rdev->desc_nr); | |
1da177e4 | 2097 | if (rdev->sb_loaded) { |
cd2ac932 CR |
2098 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
2099 | switch (major_version) { | |
2100 | case 0: | |
2101 | print_sb_90((mdp_super_t*)page_address(rdev->sb_page)); | |
2102 | break; | |
2103 | case 1: | |
2104 | print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page)); | |
2105 | break; | |
2106 | } | |
1da177e4 LT |
2107 | } else |
2108 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
2109 | } | |
2110 | ||
5e56341d | 2111 | static void md_print_devices(void) |
1da177e4 | 2112 | { |
159ec1fc | 2113 | struct list_head *tmp; |
1da177e4 LT |
2114 | mdk_rdev_t *rdev; |
2115 | mddev_t *mddev; | |
2116 | char b[BDEVNAME_SIZE]; | |
2117 | ||
2118 | printk("\n"); | |
2119 | printk("md: **********************************\n"); | |
2120 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
2121 | printk("md: **********************************\n"); | |
29ac4aa3 | 2122 | for_each_mddev(mddev, tmp) { |
1da177e4 | 2123 | |
32a7627c N |
2124 | if (mddev->bitmap) |
2125 | bitmap_print_sb(mddev->bitmap); | |
2126 | else | |
2127 | printk("%s: ", mdname(mddev)); | |
159ec1fc | 2128 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
2129 | printk("<%s>", bdevname(rdev->bdev,b)); |
2130 | printk("\n"); | |
2131 | ||
159ec1fc | 2132 | list_for_each_entry(rdev, &mddev->disks, same_set) |
cd2ac932 | 2133 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
2134 | } |
2135 | printk("md: **********************************\n"); | |
2136 | printk("\n"); | |
2137 | } | |
2138 | ||
2139 | ||
42543769 | 2140 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 2141 | { |
42543769 N |
2142 | /* Update each superblock (in-memory image), but |
2143 | * if we are allowed to, skip spares which already | |
2144 | * have the right event counter, or have one earlier | |
2145 | * (which would mean they aren't being marked as dirty | |
2146 | * with the rest of the array) | |
2147 | */ | |
1da177e4 | 2148 | mdk_rdev_t *rdev; |
159ec1fc | 2149 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
42543769 N |
2150 | if (rdev->sb_events == mddev->events || |
2151 | (nospares && | |
2152 | rdev->raid_disk < 0 && | |
42543769 N |
2153 | rdev->sb_events+1 == mddev->events)) { |
2154 | /* Don't update this superblock */ | |
2155 | rdev->sb_loaded = 2; | |
2156 | } else { | |
2157 | super_types[mddev->major_version]. | |
2158 | sync_super(mddev, rdev); | |
2159 | rdev->sb_loaded = 1; | |
2160 | } | |
1da177e4 LT |
2161 | } |
2162 | } | |
2163 | ||
850b2b42 | 2164 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 2165 | { |
1da177e4 | 2166 | mdk_rdev_t *rdev; |
06d91a5f | 2167 | int sync_req; |
42543769 | 2168 | int nospares = 0; |
1da177e4 | 2169 | |
1da177e4 | 2170 | repeat: |
3a3a5ddb N |
2171 | /* First make sure individual recovery_offsets are correct */ |
2172 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
2173 | if (rdev->raid_disk >= 0 && | |
2174 | mddev->delta_disks >= 0 && | |
2175 | !test_bit(In_sync, &rdev->flags) && | |
2176 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2177 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2178 | ||
2179 | } | |
bd52b746 | 2180 | if (!mddev->persistent) { |
070dc6dd | 2181 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2182 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
d97a41dc N |
2183 | if (!mddev->external) |
2184 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
3a3a5ddb N |
2185 | wake_up(&mddev->sb_wait); |
2186 | return; | |
2187 | } | |
2188 | ||
a9701a30 | 2189 | spin_lock_irq(&mddev->write_lock); |
84692195 | 2190 | |
3a3a5ddb N |
2191 | mddev->utime = get_seconds(); |
2192 | ||
850b2b42 N |
2193 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2194 | force_change = 1; | |
2195 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2196 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2197 | * though if events isn't the right even/odd, we will have to do | |
2198 | * spares after all | |
2199 | */ | |
2200 | nospares = 1; | |
2201 | if (force_change) | |
2202 | nospares = 0; | |
2203 | if (mddev->degraded) | |
84692195 N |
2204 | /* If the array is degraded, then skipping spares is both |
2205 | * dangerous and fairly pointless. | |
2206 | * Dangerous because a device that was removed from the array | |
2207 | * might have a event_count that still looks up-to-date, | |
2208 | * so it can be re-added without a resync. | |
2209 | * Pointless because if there are any spares to skip, | |
2210 | * then a recovery will happen and soon that array won't | |
2211 | * be degraded any more and the spare can go back to sleep then. | |
2212 | */ | |
850b2b42 | 2213 | nospares = 0; |
84692195 | 2214 | |
06d91a5f | 2215 | sync_req = mddev->in_sync; |
42543769 N |
2216 | |
2217 | /* If this is just a dirty<->clean transition, and the array is clean | |
2218 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2219 | if (nospares |
42543769 | 2220 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2221 | && mddev->can_decrease_events |
2222 | && mddev->events != 1) { | |
42543769 | 2223 | mddev->events--; |
a8707c08 N |
2224 | mddev->can_decrease_events = 0; |
2225 | } else { | |
42543769 N |
2226 | /* otherwise we have to go forward and ... */ |
2227 | mddev->events ++; | |
a8707c08 | 2228 | mddev->can_decrease_events = nospares; |
42543769 | 2229 | } |
1da177e4 LT |
2230 | |
2231 | if (!mddev->events) { | |
2232 | /* | |
2233 | * oops, this 64-bit counter should never wrap. | |
2234 | * Either we are in around ~1 trillion A.C., assuming | |
2235 | * 1 reboot per second, or we have a bug: | |
2236 | */ | |
2237 | MD_BUG(); | |
2238 | mddev->events --; | |
2239 | } | |
e691063a | 2240 | sync_sbs(mddev, nospares); |
a9701a30 | 2241 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
2242 | |
2243 | dprintk(KERN_INFO | |
2244 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
2245 | mdname(mddev),mddev->in_sync); | |
2246 | ||
4ad13663 | 2247 | bitmap_update_sb(mddev->bitmap); |
159ec1fc | 2248 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
2249 | char b[BDEVNAME_SIZE]; |
2250 | dprintk(KERN_INFO "md: "); | |
42543769 N |
2251 | if (rdev->sb_loaded != 1) |
2252 | continue; /* no noise on spare devices */ | |
b2d444d7 | 2253 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2254 | dprintk("(skipping faulty "); |
2255 | ||
2256 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 2257 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2258 | md_super_write(mddev,rdev, |
0f420358 | 2259 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 N |
2260 | rdev->sb_page); |
2261 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
2262 | bdevname(rdev->bdev,b), | |
0f420358 | 2263 | (unsigned long long)rdev->sb_start); |
42543769 | 2264 | rdev->sb_events = mddev->events; |
7bfa19f2 | 2265 | |
1da177e4 LT |
2266 | } else |
2267 | dprintk(")\n"); | |
7bfa19f2 | 2268 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2269 | /* only need to write one superblock... */ |
2270 | break; | |
2271 | } | |
a9701a30 | 2272 | md_super_wait(mddev); |
850b2b42 | 2273 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2274 | |
a9701a30 | 2275 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
2276 | if (mddev->in_sync != sync_req || |
2277 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2278 | /* have to write it out again */ |
a9701a30 | 2279 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
2280 | goto repeat; |
2281 | } | |
850b2b42 | 2282 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 2283 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 2284 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2285 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2286 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2287 | |
1da177e4 LT |
2288 | } |
2289 | ||
7f6ce769 | 2290 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2291 | * We want to accept with case. For this we use cmd_match. |
2292 | */ | |
2293 | static int cmd_match(const char *cmd, const char *str) | |
2294 | { | |
2295 | /* See if cmd, written into a sysfs file, matches | |
2296 | * str. They must either be the same, or cmd can | |
2297 | * have a trailing newline | |
2298 | */ | |
2299 | while (*cmd && *str && *cmd == *str) { | |
2300 | cmd++; | |
2301 | str++; | |
2302 | } | |
2303 | if (*cmd == '\n') | |
2304 | cmd++; | |
2305 | if (*str || *cmd) | |
2306 | return 0; | |
2307 | return 1; | |
2308 | } | |
2309 | ||
86e6ffdd N |
2310 | struct rdev_sysfs_entry { |
2311 | struct attribute attr; | |
2312 | ssize_t (*show)(mdk_rdev_t *, char *); | |
2313 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
2314 | }; | |
2315 | ||
2316 | static ssize_t | |
96de1e66 | 2317 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
2318 | { |
2319 | char *sep = ""; | |
20a49ff6 | 2320 | size_t len = 0; |
86e6ffdd | 2321 | |
b2d444d7 | 2322 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
2323 | len+= sprintf(page+len, "%sfaulty",sep); |
2324 | sep = ","; | |
2325 | } | |
b2d444d7 | 2326 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2327 | len += sprintf(page+len, "%sin_sync",sep); |
2328 | sep = ","; | |
2329 | } | |
f655675b N |
2330 | if (test_bit(WriteMostly, &rdev->flags)) { |
2331 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2332 | sep = ","; | |
2333 | } | |
6bfe0b49 DW |
2334 | if (test_bit(Blocked, &rdev->flags)) { |
2335 | len += sprintf(page+len, "%sblocked", sep); | |
2336 | sep = ","; | |
2337 | } | |
b2d444d7 N |
2338 | if (!test_bit(Faulty, &rdev->flags) && |
2339 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2340 | len += sprintf(page+len, "%sspare", sep); |
2341 | sep = ","; | |
2342 | } | |
2343 | return len+sprintf(page+len, "\n"); | |
2344 | } | |
2345 | ||
45dc2de1 N |
2346 | static ssize_t |
2347 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2348 | { | |
2349 | /* can write | |
2350 | * faulty - simulates and error | |
2351 | * remove - disconnects the device | |
f655675b N |
2352 | * writemostly - sets write_mostly |
2353 | * -writemostly - clears write_mostly | |
6bfe0b49 DW |
2354 | * blocked - sets the Blocked flag |
2355 | * -blocked - clears the Blocked flag | |
6d56e278 | 2356 | * insync - sets Insync providing device isn't active |
45dc2de1 N |
2357 | */ |
2358 | int err = -EINVAL; | |
2359 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2360 | md_error(rdev->mddev, rdev); | |
2361 | err = 0; | |
2362 | } else if (cmd_match(buf, "remove")) { | |
2363 | if (rdev->raid_disk >= 0) | |
2364 | err = -EBUSY; | |
2365 | else { | |
2366 | mddev_t *mddev = rdev->mddev; | |
2367 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
2368 | if (mddev->pers) |
2369 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2370 | md_new_event(mddev); |
2371 | err = 0; | |
2372 | } | |
f655675b N |
2373 | } else if (cmd_match(buf, "writemostly")) { |
2374 | set_bit(WriteMostly, &rdev->flags); | |
2375 | err = 0; | |
2376 | } else if (cmd_match(buf, "-writemostly")) { | |
2377 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2378 | err = 0; |
2379 | } else if (cmd_match(buf, "blocked")) { | |
2380 | set_bit(Blocked, &rdev->flags); | |
2381 | err = 0; | |
2382 | } else if (cmd_match(buf, "-blocked")) { | |
2383 | clear_bit(Blocked, &rdev->flags); | |
2384 | wake_up(&rdev->blocked_wait); | |
2385 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2386 | md_wakeup_thread(rdev->mddev->thread); | |
2387 | ||
6d56e278 N |
2388 | err = 0; |
2389 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2390 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2391 | err = 0; |
45dc2de1 | 2392 | } |
00bcb4ac N |
2393 | if (!err) |
2394 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2395 | return err ? err : len; |
2396 | } | |
80ca3a44 N |
2397 | static struct rdev_sysfs_entry rdev_state = |
2398 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2399 | |
4dbcdc75 N |
2400 | static ssize_t |
2401 | errors_show(mdk_rdev_t *rdev, char *page) | |
2402 | { | |
2403 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2404 | } | |
2405 | ||
2406 | static ssize_t | |
2407 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2408 | { | |
2409 | char *e; | |
2410 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2411 | if (*buf && (*e == 0 || *e == '\n')) { | |
2412 | atomic_set(&rdev->corrected_errors, n); | |
2413 | return len; | |
2414 | } | |
2415 | return -EINVAL; | |
2416 | } | |
2417 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2418 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2419 | |
014236d2 N |
2420 | static ssize_t |
2421 | slot_show(mdk_rdev_t *rdev, char *page) | |
2422 | { | |
2423 | if (rdev->raid_disk < 0) | |
2424 | return sprintf(page, "none\n"); | |
2425 | else | |
2426 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2427 | } | |
2428 | ||
2429 | static ssize_t | |
2430 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2431 | { | |
2432 | char *e; | |
c303da6d N |
2433 | int err; |
2434 | char nm[20]; | |
014236d2 N |
2435 | int slot = simple_strtoul(buf, &e, 10); |
2436 | if (strncmp(buf, "none", 4)==0) | |
2437 | slot = -1; | |
2438 | else if (e==buf || (*e && *e!= '\n')) | |
2439 | return -EINVAL; | |
6c2fce2e | 2440 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2441 | /* Setting 'slot' on an active array requires also |
2442 | * updating the 'rd%d' link, and communicating | |
2443 | * with the personality with ->hot_*_disk. | |
2444 | * For now we only support removing | |
2445 | * failed/spare devices. This normally happens automatically, | |
2446 | * but not when the metadata is externally managed. | |
2447 | */ | |
c303da6d N |
2448 | if (rdev->raid_disk == -1) |
2449 | return -EEXIST; | |
2450 | /* personality does all needed checks */ | |
2451 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2452 | return -EINVAL; | |
2453 | err = rdev->mddev->pers-> | |
2454 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
2455 | if (err) | |
2456 | return err; | |
2457 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2458 | sysfs_remove_link(&rdev->mddev->kobj, nm); | |
b7103107 | 2459 | rdev->raid_disk = -1; |
c303da6d N |
2460 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2461 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e NB |
2462 | } else if (rdev->mddev->pers) { |
2463 | mdk_rdev_t *rdev2; | |
6c2fce2e | 2464 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2465 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2466 | */ |
2467 | ||
2468 | if (rdev->raid_disk != -1) | |
2469 | return -EBUSY; | |
2470 | ||
2471 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2472 | return -EINVAL; | |
2473 | ||
159ec1fc | 2474 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) |
6c2fce2e NB |
2475 | if (rdev2->raid_disk == slot) |
2476 | return -EEXIST; | |
2477 | ||
2478 | rdev->raid_disk = slot; | |
2479 | if (test_bit(In_sync, &rdev->flags)) | |
2480 | rdev->saved_raid_disk = slot; | |
2481 | else | |
2482 | rdev->saved_raid_disk = -1; | |
2483 | err = rdev->mddev->pers-> | |
2484 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2485 | if (err) { |
6c2fce2e | 2486 | rdev->raid_disk = -1; |
6c2fce2e | 2487 | return err; |
52664732 | 2488 | } else |
00bcb4ac | 2489 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6c2fce2e NB |
2490 | sprintf(nm, "rd%d", rdev->raid_disk); |
2491 | if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm)) | |
00bcb4ac | 2492 | /* failure here is OK */; |
6c2fce2e | 2493 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d N |
2494 | } else { |
2495 | if (slot >= rdev->mddev->raid_disks) | |
2496 | return -ENOSPC; | |
2497 | rdev->raid_disk = slot; | |
2498 | /* assume it is working */ | |
c5d79adb N |
2499 | clear_bit(Faulty, &rdev->flags); |
2500 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2501 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2502 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2503 | } |
014236d2 N |
2504 | return len; |
2505 | } | |
2506 | ||
2507 | ||
2508 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2509 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2510 | |
93c8cad0 N |
2511 | static ssize_t |
2512 | offset_show(mdk_rdev_t *rdev, char *page) | |
2513 | { | |
6961ece4 | 2514 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2515 | } |
2516 | ||
2517 | static ssize_t | |
2518 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2519 | { | |
2520 | char *e; | |
2521 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2522 | if (e==buf || (*e && *e != '\n')) | |
2523 | return -EINVAL; | |
8ed0a521 | 2524 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2525 | return -EBUSY; |
dd8ac336 | 2526 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2527 | /* Must set offset before size, so overlap checks |
2528 | * can be sane */ | |
2529 | return -EBUSY; | |
93c8cad0 N |
2530 | rdev->data_offset = offset; |
2531 | return len; | |
2532 | } | |
2533 | ||
2534 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2535 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2536 | |
83303b61 N |
2537 | static ssize_t |
2538 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2539 | { | |
dd8ac336 | 2540 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2541 | } |
2542 | ||
c5d79adb N |
2543 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2544 | { | |
2545 | /* check if two start/length pairs overlap */ | |
2546 | if (s1+l1 <= s2) | |
2547 | return 0; | |
2548 | if (s2+l2 <= s1) | |
2549 | return 0; | |
2550 | return 1; | |
2551 | } | |
2552 | ||
b522adcd DW |
2553 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2554 | { | |
2555 | unsigned long long blocks; | |
2556 | sector_t new; | |
2557 | ||
2558 | if (strict_strtoull(buf, 10, &blocks) < 0) | |
2559 | return -EINVAL; | |
2560 | ||
2561 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2562 | return -EINVAL; /* sector conversion overflow */ | |
2563 | ||
2564 | new = blocks * 2; | |
2565 | if (new != blocks * 2) | |
2566 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2567 | ||
2568 | *sectors = new; | |
2569 | return 0; | |
2570 | } | |
2571 | ||
83303b61 N |
2572 | static ssize_t |
2573 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2574 | { | |
27c529bb | 2575 | mddev_t *my_mddev = rdev->mddev; |
dd8ac336 | 2576 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2577 | sector_t sectors; |
27c529bb | 2578 | |
b522adcd | 2579 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2580 | return -EINVAL; |
0cd17fec | 2581 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2582 | if (my_mddev->persistent) { |
dd8ac336 AN |
2583 | sectors = super_types[my_mddev->major_version]. |
2584 | rdev_size_change(rdev, sectors); | |
2585 | if (!sectors) | |
0cd17fec | 2586 | return -EBUSY; |
dd8ac336 | 2587 | } else if (!sectors) |
77304d2a | 2588 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 2589 | rdev->data_offset; |
0cd17fec | 2590 | } |
dd8ac336 | 2591 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2592 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2593 | |
dd8ac336 AN |
2594 | rdev->sectors = sectors; |
2595 | if (sectors > oldsectors && my_mddev->external) { | |
c5d79adb N |
2596 | /* need to check that all other rdevs with the same ->bdev |
2597 | * do not overlap. We need to unlock the mddev to avoid | |
dd8ac336 | 2598 | * a deadlock. We have already changed rdev->sectors, and if |
c5d79adb N |
2599 | * we have to change it back, we will have the lock again. |
2600 | */ | |
2601 | mddev_t *mddev; | |
2602 | int overlap = 0; | |
159ec1fc | 2603 | struct list_head *tmp; |
c5d79adb | 2604 | |
27c529bb | 2605 | mddev_unlock(my_mddev); |
29ac4aa3 | 2606 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2607 | mdk_rdev_t *rdev2; |
2608 | ||
2609 | mddev_lock(mddev); | |
159ec1fc | 2610 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
c5d79adb N |
2611 | if (test_bit(AllReserved, &rdev2->flags) || |
2612 | (rdev->bdev == rdev2->bdev && | |
2613 | rdev != rdev2 && | |
dd8ac336 | 2614 | overlaps(rdev->data_offset, rdev->sectors, |
d07bd3bc | 2615 | rdev2->data_offset, |
dd8ac336 | 2616 | rdev2->sectors))) { |
c5d79adb N |
2617 | overlap = 1; |
2618 | break; | |
2619 | } | |
2620 | mddev_unlock(mddev); | |
2621 | if (overlap) { | |
2622 | mddev_put(mddev); | |
2623 | break; | |
2624 | } | |
2625 | } | |
27c529bb | 2626 | mddev_lock(my_mddev); |
c5d79adb N |
2627 | if (overlap) { |
2628 | /* Someone else could have slipped in a size | |
2629 | * change here, but doing so is just silly. | |
dd8ac336 | 2630 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2631 | * safe, and trust userspace not to race with |
2632 | * itself | |
2633 | */ | |
dd8ac336 | 2634 | rdev->sectors = oldsectors; |
c5d79adb N |
2635 | return -EBUSY; |
2636 | } | |
2637 | } | |
83303b61 N |
2638 | return len; |
2639 | } | |
2640 | ||
2641 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2642 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2643 | |
06e3c817 DW |
2644 | |
2645 | static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page) | |
2646 | { | |
2647 | unsigned long long recovery_start = rdev->recovery_offset; | |
2648 | ||
2649 | if (test_bit(In_sync, &rdev->flags) || | |
2650 | recovery_start == MaxSector) | |
2651 | return sprintf(page, "none\n"); | |
2652 | ||
2653 | return sprintf(page, "%llu\n", recovery_start); | |
2654 | } | |
2655 | ||
2656 | static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2657 | { | |
2658 | unsigned long long recovery_start; | |
2659 | ||
2660 | if (cmd_match(buf, "none")) | |
2661 | recovery_start = MaxSector; | |
2662 | else if (strict_strtoull(buf, 10, &recovery_start)) | |
2663 | return -EINVAL; | |
2664 | ||
2665 | if (rdev->mddev->pers && | |
2666 | rdev->raid_disk >= 0) | |
2667 | return -EBUSY; | |
2668 | ||
2669 | rdev->recovery_offset = recovery_start; | |
2670 | if (recovery_start == MaxSector) | |
2671 | set_bit(In_sync, &rdev->flags); | |
2672 | else | |
2673 | clear_bit(In_sync, &rdev->flags); | |
2674 | return len; | |
2675 | } | |
2676 | ||
2677 | static struct rdev_sysfs_entry rdev_recovery_start = | |
2678 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
2679 | ||
86e6ffdd N |
2680 | static struct attribute *rdev_default_attrs[] = { |
2681 | &rdev_state.attr, | |
4dbcdc75 | 2682 | &rdev_errors.attr, |
014236d2 | 2683 | &rdev_slot.attr, |
93c8cad0 | 2684 | &rdev_offset.attr, |
83303b61 | 2685 | &rdev_size.attr, |
06e3c817 | 2686 | &rdev_recovery_start.attr, |
86e6ffdd N |
2687 | NULL, |
2688 | }; | |
2689 | static ssize_t | |
2690 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2691 | { | |
2692 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2693 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2694 | mddev_t *mddev = rdev->mddev; |
2695 | ssize_t rv; | |
86e6ffdd N |
2696 | |
2697 | if (!entry->show) | |
2698 | return -EIO; | |
27c529bb N |
2699 | |
2700 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2701 | if (!rv) { | |
2702 | if (rdev->mddev == NULL) | |
2703 | rv = -EBUSY; | |
2704 | else | |
2705 | rv = entry->show(rdev, page); | |
2706 | mddev_unlock(mddev); | |
2707 | } | |
2708 | return rv; | |
86e6ffdd N |
2709 | } |
2710 | ||
2711 | static ssize_t | |
2712 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2713 | const char *page, size_t length) | |
2714 | { | |
2715 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2716 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2717 | ssize_t rv; |
2718 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2719 | |
2720 | if (!entry->store) | |
2721 | return -EIO; | |
67463acb N |
2722 | if (!capable(CAP_SYS_ADMIN)) |
2723 | return -EACCES; | |
27c529bb | 2724 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2725 | if (!rv) { |
27c529bb N |
2726 | if (rdev->mddev == NULL) |
2727 | rv = -EBUSY; | |
2728 | else | |
2729 | rv = entry->store(rdev, page, length); | |
6a51830e | 2730 | mddev_unlock(mddev); |
ca388059 N |
2731 | } |
2732 | return rv; | |
86e6ffdd N |
2733 | } |
2734 | ||
2735 | static void rdev_free(struct kobject *ko) | |
2736 | { | |
2737 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2738 | kfree(rdev); | |
2739 | } | |
52cf25d0 | 2740 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
2741 | .show = rdev_attr_show, |
2742 | .store = rdev_attr_store, | |
2743 | }; | |
2744 | static struct kobj_type rdev_ktype = { | |
2745 | .release = rdev_free, | |
2746 | .sysfs_ops = &rdev_sysfs_ops, | |
2747 | .default_attrs = rdev_default_attrs, | |
2748 | }; | |
2749 | ||
e8bb9a83 N |
2750 | void md_rdev_init(mdk_rdev_t *rdev) |
2751 | { | |
2752 | rdev->desc_nr = -1; | |
2753 | rdev->saved_raid_disk = -1; | |
2754 | rdev->raid_disk = -1; | |
2755 | rdev->flags = 0; | |
2756 | rdev->data_offset = 0; | |
2757 | rdev->sb_events = 0; | |
2758 | rdev->last_read_error.tv_sec = 0; | |
2759 | rdev->last_read_error.tv_nsec = 0; | |
2760 | atomic_set(&rdev->nr_pending, 0); | |
2761 | atomic_set(&rdev->read_errors, 0); | |
2762 | atomic_set(&rdev->corrected_errors, 0); | |
2763 | ||
2764 | INIT_LIST_HEAD(&rdev->same_set); | |
2765 | init_waitqueue_head(&rdev->blocked_wait); | |
2766 | } | |
2767 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
2768 | /* |
2769 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2770 | * | |
2771 | * mark the device faulty if: | |
2772 | * | |
2773 | * - the device is nonexistent (zero size) | |
2774 | * - the device has no valid superblock | |
2775 | * | |
2776 | * a faulty rdev _never_ has rdev->sb set. | |
2777 | */ | |
2778 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2779 | { | |
2780 | char b[BDEVNAME_SIZE]; | |
2781 | int err; | |
2782 | mdk_rdev_t *rdev; | |
2783 | sector_t size; | |
2784 | ||
9ffae0cf | 2785 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2786 | if (!rdev) { |
2787 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2788 | return ERR_PTR(-ENOMEM); | |
2789 | } | |
1da177e4 | 2790 | |
e8bb9a83 | 2791 | md_rdev_init(rdev); |
1da177e4 LT |
2792 | if ((err = alloc_disk_sb(rdev))) |
2793 | goto abort_free; | |
2794 | ||
c5d79adb | 2795 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2796 | if (err) |
2797 | goto abort_free; | |
2798 | ||
f9cb074b | 2799 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2800 | |
77304d2a | 2801 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 LT |
2802 | if (!size) { |
2803 | printk(KERN_WARNING | |
2804 | "md: %s has zero or unknown size, marking faulty!\n", | |
2805 | bdevname(rdev->bdev,b)); | |
2806 | err = -EINVAL; | |
2807 | goto abort_free; | |
2808 | } | |
2809 | ||
2810 | if (super_format >= 0) { | |
2811 | err = super_types[super_format]. | |
2812 | load_super(rdev, NULL, super_minor); | |
2813 | if (err == -EINVAL) { | |
df968c4e N |
2814 | printk(KERN_WARNING |
2815 | "md: %s does not have a valid v%d.%d " | |
2816 | "superblock, not importing!\n", | |
2817 | bdevname(rdev->bdev,b), | |
2818 | super_format, super_minor); | |
1da177e4 LT |
2819 | goto abort_free; |
2820 | } | |
2821 | if (err < 0) { | |
2822 | printk(KERN_WARNING | |
2823 | "md: could not read %s's sb, not importing!\n", | |
2824 | bdevname(rdev->bdev,b)); | |
2825 | goto abort_free; | |
2826 | } | |
2827 | } | |
6bfe0b49 | 2828 | |
1da177e4 LT |
2829 | return rdev; |
2830 | ||
2831 | abort_free: | |
2832 | if (rdev->sb_page) { | |
2833 | if (rdev->bdev) | |
2834 | unlock_rdev(rdev); | |
2835 | free_disk_sb(rdev); | |
2836 | } | |
2837 | kfree(rdev); | |
2838 | return ERR_PTR(err); | |
2839 | } | |
2840 | ||
2841 | /* | |
2842 | * Check a full RAID array for plausibility | |
2843 | */ | |
2844 | ||
2845 | ||
a757e64c | 2846 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2847 | { |
2848 | int i; | |
159ec1fc | 2849 | mdk_rdev_t *rdev, *freshest, *tmp; |
1da177e4 LT |
2850 | char b[BDEVNAME_SIZE]; |
2851 | ||
2852 | freshest = NULL; | |
d089c6af | 2853 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
2854 | switch (super_types[mddev->major_version]. |
2855 | load_super(rdev, freshest, mddev->minor_version)) { | |
2856 | case 1: | |
2857 | freshest = rdev; | |
2858 | break; | |
2859 | case 0: | |
2860 | break; | |
2861 | default: | |
2862 | printk( KERN_ERR \ | |
2863 | "md: fatal superblock inconsistency in %s" | |
2864 | " -- removing from array\n", | |
2865 | bdevname(rdev->bdev,b)); | |
2866 | kick_rdev_from_array(rdev); | |
2867 | } | |
2868 | ||
2869 | ||
2870 | super_types[mddev->major_version]. | |
2871 | validate_super(mddev, freshest); | |
2872 | ||
2873 | i = 0; | |
d089c6af | 2874 | rdev_for_each(rdev, tmp, mddev) { |
233fca36 N |
2875 | if (mddev->max_disks && |
2876 | (rdev->desc_nr >= mddev->max_disks || | |
2877 | i > mddev->max_disks)) { | |
de01dfad N |
2878 | printk(KERN_WARNING |
2879 | "md: %s: %s: only %d devices permitted\n", | |
2880 | mdname(mddev), bdevname(rdev->bdev, b), | |
2881 | mddev->max_disks); | |
2882 | kick_rdev_from_array(rdev); | |
2883 | continue; | |
2884 | } | |
1da177e4 LT |
2885 | if (rdev != freshest) |
2886 | if (super_types[mddev->major_version]. | |
2887 | validate_super(mddev, rdev)) { | |
2888 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2889 | " from array!\n", | |
2890 | bdevname(rdev->bdev,b)); | |
2891 | kick_rdev_from_array(rdev); | |
2892 | continue; | |
2893 | } | |
2894 | if (mddev->level == LEVEL_MULTIPATH) { | |
2895 | rdev->desc_nr = i++; | |
2896 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2897 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 2898 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
2899 | rdev->raid_disk = -1; |
2900 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2901 | } |
2902 | } | |
1da177e4 LT |
2903 | } |
2904 | ||
72e02075 N |
2905 | /* Read a fixed-point number. |
2906 | * Numbers in sysfs attributes should be in "standard" units where | |
2907 | * possible, so time should be in seconds. | |
2908 | * However we internally use a a much smaller unit such as | |
2909 | * milliseconds or jiffies. | |
2910 | * This function takes a decimal number with a possible fractional | |
2911 | * component, and produces an integer which is the result of | |
2912 | * multiplying that number by 10^'scale'. | |
2913 | * all without any floating-point arithmetic. | |
2914 | */ | |
2915 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
2916 | { | |
2917 | unsigned long result = 0; | |
2918 | long decimals = -1; | |
2919 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
2920 | if (*cp == '.') | |
2921 | decimals = 0; | |
2922 | else if (decimals < scale) { | |
2923 | unsigned int value; | |
2924 | value = *cp - '0'; | |
2925 | result = result * 10 + value; | |
2926 | if (decimals >= 0) | |
2927 | decimals++; | |
2928 | } | |
2929 | cp++; | |
2930 | } | |
2931 | if (*cp == '\n') | |
2932 | cp++; | |
2933 | if (*cp) | |
2934 | return -EINVAL; | |
2935 | if (decimals < 0) | |
2936 | decimals = 0; | |
2937 | while (decimals < scale) { | |
2938 | result *= 10; | |
2939 | decimals ++; | |
2940 | } | |
2941 | *res = result; | |
2942 | return 0; | |
2943 | } | |
2944 | ||
2945 | ||
19052c0e N |
2946 | static void md_safemode_timeout(unsigned long data); |
2947 | ||
16f17b39 N |
2948 | static ssize_t |
2949 | safe_delay_show(mddev_t *mddev, char *page) | |
2950 | { | |
2951 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2952 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2953 | } | |
2954 | static ssize_t | |
2955 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2956 | { | |
16f17b39 | 2957 | unsigned long msec; |
97ce0a7f | 2958 | |
72e02075 | 2959 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 2960 | return -EINVAL; |
16f17b39 N |
2961 | if (msec == 0) |
2962 | mddev->safemode_delay = 0; | |
2963 | else { | |
19052c0e | 2964 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
2965 | mddev->safemode_delay = (msec*HZ)/1000; |
2966 | if (mddev->safemode_delay == 0) | |
2967 | mddev->safemode_delay = 1; | |
19052c0e N |
2968 | if (mddev->safemode_delay < old_delay) |
2969 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
2970 | } |
2971 | return len; | |
2972 | } | |
2973 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2974 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2975 | |
eae1701f | 2976 | static ssize_t |
96de1e66 | 2977 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2978 | { |
2604b703 | 2979 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2980 | if (p) |
eae1701f | 2981 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2982 | else if (mddev->clevel[0]) |
2983 | return sprintf(page, "%s\n", mddev->clevel); | |
2984 | else if (mddev->level != LEVEL_NONE) | |
2985 | return sprintf(page, "%d\n", mddev->level); | |
2986 | else | |
2987 | return 0; | |
eae1701f N |
2988 | } |
2989 | ||
d9d166c2 N |
2990 | static ssize_t |
2991 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2992 | { | |
f2859af6 | 2993 | char clevel[16]; |
20a49ff6 | 2994 | ssize_t rv = len; |
245f46c2 | 2995 | struct mdk_personality *pers; |
f2859af6 | 2996 | long level; |
245f46c2 | 2997 | void *priv; |
3a981b03 | 2998 | mdk_rdev_t *rdev; |
245f46c2 N |
2999 | |
3000 | if (mddev->pers == NULL) { | |
3001 | if (len == 0) | |
3002 | return 0; | |
3003 | if (len >= sizeof(mddev->clevel)) | |
3004 | return -ENOSPC; | |
3005 | strncpy(mddev->clevel, buf, len); | |
3006 | if (mddev->clevel[len-1] == '\n') | |
3007 | len--; | |
3008 | mddev->clevel[len] = 0; | |
3009 | mddev->level = LEVEL_NONE; | |
3010 | return rv; | |
3011 | } | |
3012 | ||
3013 | /* request to change the personality. Need to ensure: | |
3014 | * - array is not engaged in resync/recovery/reshape | |
3015 | * - old personality can be suspended | |
3016 | * - new personality will access other array. | |
3017 | */ | |
3018 | ||
bb4f1e9d N |
3019 | if (mddev->sync_thread || |
3020 | mddev->reshape_position != MaxSector || | |
3021 | mddev->sysfs_active) | |
d9d166c2 | 3022 | return -EBUSY; |
245f46c2 N |
3023 | |
3024 | if (!mddev->pers->quiesce) { | |
3025 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3026 | mdname(mddev), mddev->pers->name); | |
3027 | return -EINVAL; | |
3028 | } | |
3029 | ||
3030 | /* Now find the new personality */ | |
f2859af6 | 3031 | if (len == 0 || len >= sizeof(clevel)) |
245f46c2 | 3032 | return -EINVAL; |
f2859af6 DW |
3033 | strncpy(clevel, buf, len); |
3034 | if (clevel[len-1] == '\n') | |
d9d166c2 | 3035 | len--; |
f2859af6 DW |
3036 | clevel[len] = 0; |
3037 | if (strict_strtol(clevel, 10, &level)) | |
3038 | level = LEVEL_NONE; | |
245f46c2 | 3039 | |
f2859af6 DW |
3040 | if (request_module("md-%s", clevel) != 0) |
3041 | request_module("md-level-%s", clevel); | |
245f46c2 | 3042 | spin_lock(&pers_lock); |
f2859af6 | 3043 | pers = find_pers(level, clevel); |
245f46c2 N |
3044 | if (!pers || !try_module_get(pers->owner)) { |
3045 | spin_unlock(&pers_lock); | |
f2859af6 | 3046 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
245f46c2 N |
3047 | return -EINVAL; |
3048 | } | |
3049 | spin_unlock(&pers_lock); | |
3050 | ||
3051 | if (pers == mddev->pers) { | |
3052 | /* Nothing to do! */ | |
3053 | module_put(pers->owner); | |
3054 | return rv; | |
3055 | } | |
3056 | if (!pers->takeover) { | |
3057 | module_put(pers->owner); | |
3058 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3059 | mdname(mddev), clevel); |
245f46c2 N |
3060 | return -EINVAL; |
3061 | } | |
3062 | ||
e93f68a1 N |
3063 | list_for_each_entry(rdev, &mddev->disks, same_set) |
3064 | rdev->new_raid_disk = rdev->raid_disk; | |
3065 | ||
245f46c2 N |
3066 | /* ->takeover must set new_* and/or delta_disks |
3067 | * if it succeeds, and may set them when it fails. | |
3068 | */ | |
3069 | priv = pers->takeover(mddev); | |
3070 | if (IS_ERR(priv)) { | |
3071 | mddev->new_level = mddev->level; | |
3072 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3073 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3074 | mddev->raid_disks -= mddev->delta_disks; |
3075 | mddev->delta_disks = 0; | |
3076 | module_put(pers->owner); | |
3077 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3078 | mdname(mddev), clevel); |
245f46c2 N |
3079 | return PTR_ERR(priv); |
3080 | } | |
3081 | ||
3082 | /* Looks like we have a winner */ | |
3083 | mddev_suspend(mddev); | |
3084 | mddev->pers->stop(mddev); | |
a64c876f N |
3085 | |
3086 | if (mddev->pers->sync_request == NULL && | |
3087 | pers->sync_request != NULL) { | |
3088 | /* need to add the md_redundancy_group */ | |
3089 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3090 | printk(KERN_WARNING | |
3091 | "md: cannot register extra attributes for %s\n", | |
3092 | mdname(mddev)); | |
19fdb9ee | 3093 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action"); |
a64c876f N |
3094 | } |
3095 | if (mddev->pers->sync_request != NULL && | |
3096 | pers->sync_request == NULL) { | |
3097 | /* need to remove the md_redundancy_group */ | |
3098 | if (mddev->to_remove == NULL) | |
3099 | mddev->to_remove = &md_redundancy_group; | |
3100 | } | |
3101 | ||
54071b38 TM |
3102 | if (mddev->pers->sync_request == NULL && |
3103 | mddev->external) { | |
3104 | /* We are converting from a no-redundancy array | |
3105 | * to a redundancy array and metadata is managed | |
3106 | * externally so we need to be sure that writes | |
3107 | * won't block due to a need to transition | |
3108 | * clean->dirty | |
3109 | * until external management is started. | |
3110 | */ | |
3111 | mddev->in_sync = 0; | |
3112 | mddev->safemode_delay = 0; | |
3113 | mddev->safemode = 0; | |
3114 | } | |
3115 | ||
e93f68a1 N |
3116 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
3117 | char nm[20]; | |
3118 | if (rdev->raid_disk < 0) | |
3119 | continue; | |
3120 | if (rdev->new_raid_disk > mddev->raid_disks) | |
3121 | rdev->new_raid_disk = -1; | |
3122 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3123 | continue; | |
3124 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3125 | sysfs_remove_link(&mddev->kobj, nm); | |
3126 | } | |
3127 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
3128 | if (rdev->raid_disk < 0) | |
3129 | continue; | |
3130 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3131 | continue; | |
3132 | rdev->raid_disk = rdev->new_raid_disk; | |
3133 | if (rdev->raid_disk < 0) | |
3a981b03 | 3134 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 N |
3135 | else { |
3136 | char nm[20]; | |
3137 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3138 | if(sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) | |
3139 | printk("md: cannot register %s for %s after level change\n", | |
3140 | nm, mdname(mddev)); | |
3a981b03 | 3141 | } |
e93f68a1 N |
3142 | } |
3143 | ||
3144 | module_put(mddev->pers->owner); | |
245f46c2 N |
3145 | mddev->pers = pers; |
3146 | mddev->private = priv; | |
3147 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3148 | mddev->level = mddev->new_level; | |
3149 | mddev->layout = mddev->new_layout; | |
664e7c41 | 3150 | mddev->chunk_sectors = mddev->new_chunk_sectors; |
245f46c2 | 3151 | mddev->delta_disks = 0; |
9af204cf TM |
3152 | if (mddev->pers->sync_request == NULL) { |
3153 | /* this is now an array without redundancy, so | |
3154 | * it must always be in_sync | |
3155 | */ | |
3156 | mddev->in_sync = 1; | |
3157 | del_timer_sync(&mddev->safemode_timer); | |
3158 | } | |
245f46c2 N |
3159 | pers->run(mddev); |
3160 | mddev_resume(mddev); | |
3161 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
3162 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3163 | md_wakeup_thread(mddev->thread); | |
5cac7861 | 3164 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3165 | md_new_event(mddev); |
d9d166c2 N |
3166 | return rv; |
3167 | } | |
3168 | ||
3169 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3170 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3171 | |
d4dbd025 N |
3172 | |
3173 | static ssize_t | |
3174 | layout_show(mddev_t *mddev, char *page) | |
3175 | { | |
3176 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3177 | if (mddev->reshape_position != MaxSector && |
3178 | mddev->layout != mddev->new_layout) | |
3179 | return sprintf(page, "%d (%d)\n", | |
3180 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3181 | return sprintf(page, "%d\n", mddev->layout); |
3182 | } | |
3183 | ||
3184 | static ssize_t | |
3185 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
3186 | { | |
3187 | char *e; | |
3188 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
3189 | |
3190 | if (!*buf || (*e && *e != '\n')) | |
3191 | return -EINVAL; | |
3192 | ||
b3546035 N |
3193 | if (mddev->pers) { |
3194 | int err; | |
50ac168a | 3195 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3196 | return -EBUSY; |
597a711b | 3197 | mddev->new_layout = n; |
50ac168a | 3198 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3199 | if (err) { |
3200 | mddev->new_layout = mddev->layout; | |
b3546035 | 3201 | return err; |
597a711b | 3202 | } |
b3546035 | 3203 | } else { |
08a02ecd | 3204 | mddev->new_layout = n; |
b3546035 N |
3205 | if (mddev->reshape_position == MaxSector) |
3206 | mddev->layout = n; | |
3207 | } | |
d4dbd025 N |
3208 | return len; |
3209 | } | |
3210 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3211 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
3212 | |
3213 | ||
eae1701f | 3214 | static ssize_t |
96de1e66 | 3215 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 3216 | { |
bb636547 N |
3217 | if (mddev->raid_disks == 0) |
3218 | return 0; | |
08a02ecd N |
3219 | if (mddev->reshape_position != MaxSector && |
3220 | mddev->delta_disks != 0) | |
3221 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3222 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3223 | return sprintf(page, "%d\n", mddev->raid_disks); |
3224 | } | |
3225 | ||
da943b99 N |
3226 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
3227 | ||
3228 | static ssize_t | |
3229 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
3230 | { | |
da943b99 N |
3231 | char *e; |
3232 | int rv = 0; | |
3233 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3234 | ||
3235 | if (!*buf || (*e && *e != '\n')) | |
3236 | return -EINVAL; | |
3237 | ||
3238 | if (mddev->pers) | |
3239 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
3240 | else if (mddev->reshape_position != MaxSector) { |
3241 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
3242 | mddev->delta_disks = n - olddisks; | |
3243 | mddev->raid_disks = n; | |
3244 | } else | |
da943b99 N |
3245 | mddev->raid_disks = n; |
3246 | return rv ? rv : len; | |
3247 | } | |
3248 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3249 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3250 | |
3b34380a N |
3251 | static ssize_t |
3252 | chunk_size_show(mddev_t *mddev, char *page) | |
3253 | { | |
08a02ecd | 3254 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3255 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3256 | return sprintf(page, "%d (%d)\n", | |
3257 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3258 | mddev->chunk_sectors << 9); |
3259 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3260 | } |
3261 | ||
3262 | static ssize_t | |
3263 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
3264 | { | |
3b34380a N |
3265 | char *e; |
3266 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3267 | ||
3b34380a N |
3268 | if (!*buf || (*e && *e != '\n')) |
3269 | return -EINVAL; | |
3270 | ||
b3546035 N |
3271 | if (mddev->pers) { |
3272 | int err; | |
50ac168a | 3273 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3274 | return -EBUSY; |
597a711b | 3275 | mddev->new_chunk_sectors = n >> 9; |
50ac168a | 3276 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3277 | if (err) { |
3278 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
b3546035 | 3279 | return err; |
597a711b | 3280 | } |
b3546035 | 3281 | } else { |
664e7c41 | 3282 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3283 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3284 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3285 | } |
3b34380a N |
3286 | return len; |
3287 | } | |
3288 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3289 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3290 | |
a94213b1 N |
3291 | static ssize_t |
3292 | resync_start_show(mddev_t *mddev, char *page) | |
3293 | { | |
d1a7c503 N |
3294 | if (mddev->recovery_cp == MaxSector) |
3295 | return sprintf(page, "none\n"); | |
a94213b1 N |
3296 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3297 | } | |
3298 | ||
3299 | static ssize_t | |
3300 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
3301 | { | |
a94213b1 N |
3302 | char *e; |
3303 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3304 | ||
3305 | if (mddev->pers) | |
3306 | return -EBUSY; | |
06e3c817 DW |
3307 | if (cmd_match(buf, "none")) |
3308 | n = MaxSector; | |
3309 | else if (!*buf || (*e && *e != '\n')) | |
a94213b1 N |
3310 | return -EINVAL; |
3311 | ||
3312 | mddev->recovery_cp = n; | |
3313 | return len; | |
3314 | } | |
3315 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 3316 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 3317 | |
9e653b63 N |
3318 | /* |
3319 | * The array state can be: | |
3320 | * | |
3321 | * clear | |
3322 | * No devices, no size, no level | |
3323 | * Equivalent to STOP_ARRAY ioctl | |
3324 | * inactive | |
3325 | * May have some settings, but array is not active | |
3326 | * all IO results in error | |
3327 | * When written, doesn't tear down array, but just stops it | |
3328 | * suspended (not supported yet) | |
3329 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3330 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3331 | * readonly |
3332 | * no resync can happen. no superblocks get written. | |
3333 | * write requests fail | |
3334 | * read-auto | |
3335 | * like readonly, but behaves like 'clean' on a write request. | |
3336 | * | |
3337 | * clean - no pending writes, but otherwise active. | |
3338 | * When written to inactive array, starts without resync | |
3339 | * If a write request arrives then | |
3340 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3341 | * if not known, block and switch to write-pending | |
3342 | * If written to an active array that has pending writes, then fails. | |
3343 | * active | |
3344 | * fully active: IO and resync can be happening. | |
3345 | * When written to inactive array, starts with resync | |
3346 | * | |
3347 | * write-pending | |
3348 | * clean, but writes are blocked waiting for 'active' to be written. | |
3349 | * | |
3350 | * active-idle | |
3351 | * like active, but no writes have been seen for a while (100msec). | |
3352 | * | |
3353 | */ | |
3354 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3355 | write_pending, active_idle, bad_word}; | |
05381954 | 3356 | static char *array_states[] = { |
9e653b63 N |
3357 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3358 | "write-pending", "active-idle", NULL }; | |
3359 | ||
3360 | static int match_word(const char *word, char **list) | |
3361 | { | |
3362 | int n; | |
3363 | for (n=0; list[n]; n++) | |
3364 | if (cmd_match(word, list[n])) | |
3365 | break; | |
3366 | return n; | |
3367 | } | |
3368 | ||
3369 | static ssize_t | |
3370 | array_state_show(mddev_t *mddev, char *page) | |
3371 | { | |
3372 | enum array_state st = inactive; | |
3373 | ||
3374 | if (mddev->pers) | |
3375 | switch(mddev->ro) { | |
3376 | case 1: | |
3377 | st = readonly; | |
3378 | break; | |
3379 | case 2: | |
3380 | st = read_auto; | |
3381 | break; | |
3382 | case 0: | |
3383 | if (mddev->in_sync) | |
3384 | st = clean; | |
070dc6dd | 3385 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3386 | st = write_pending; |
9e653b63 N |
3387 | else if (mddev->safemode) |
3388 | st = active_idle; | |
3389 | else | |
3390 | st = active; | |
3391 | } | |
3392 | else { | |
3393 | if (list_empty(&mddev->disks) && | |
3394 | mddev->raid_disks == 0 && | |
58c0fed4 | 3395 | mddev->dev_sectors == 0) |
9e653b63 N |
3396 | st = clear; |
3397 | else | |
3398 | st = inactive; | |
3399 | } | |
3400 | return sprintf(page, "%s\n", array_states[st]); | |
3401 | } | |
3402 | ||
df5b20cf | 3403 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
a4bd82d0 | 3404 | static int md_set_readonly(mddev_t * mddev, int is_open); |
9e653b63 N |
3405 | static int do_md_run(mddev_t * mddev); |
3406 | static int restart_array(mddev_t *mddev); | |
3407 | ||
3408 | static ssize_t | |
3409 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
3410 | { | |
3411 | int err = -EINVAL; | |
3412 | enum array_state st = match_word(buf, array_states); | |
3413 | switch(st) { | |
3414 | case bad_word: | |
3415 | break; | |
3416 | case clear: | |
3417 | /* stopping an active array */ | |
f2ea68cf | 3418 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 3419 | return -EBUSY; |
df5b20cf | 3420 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
3421 | break; |
3422 | case inactive: | |
3423 | /* stopping an active array */ | |
3424 | if (mddev->pers) { | |
f2ea68cf | 3425 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 3426 | return -EBUSY; |
df5b20cf | 3427 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
3428 | } else |
3429 | err = 0; /* already inactive */ | |
9e653b63 N |
3430 | break; |
3431 | case suspended: | |
3432 | break; /* not supported yet */ | |
3433 | case readonly: | |
3434 | if (mddev->pers) | |
a4bd82d0 | 3435 | err = md_set_readonly(mddev, 0); |
9e653b63 N |
3436 | else { |
3437 | mddev->ro = 1; | |
648b629e | 3438 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3439 | err = do_md_run(mddev); |
3440 | } | |
3441 | break; | |
3442 | case read_auto: | |
9e653b63 | 3443 | if (mddev->pers) { |
80268ee9 | 3444 | if (mddev->ro == 0) |
a4bd82d0 | 3445 | err = md_set_readonly(mddev, 0); |
80268ee9 | 3446 | else if (mddev->ro == 1) |
648b629e N |
3447 | err = restart_array(mddev); |
3448 | if (err == 0) { | |
3449 | mddev->ro = 2; | |
3450 | set_disk_ro(mddev->gendisk, 0); | |
3451 | } | |
9e653b63 N |
3452 | } else { |
3453 | mddev->ro = 2; | |
3454 | err = do_md_run(mddev); | |
3455 | } | |
3456 | break; | |
3457 | case clean: | |
3458 | if (mddev->pers) { | |
3459 | restart_array(mddev); | |
3460 | spin_lock_irq(&mddev->write_lock); | |
3461 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
3462 | if (mddev->in_sync == 0) { |
3463 | mddev->in_sync = 1; | |
31a59e34 N |
3464 | if (mddev->safemode == 1) |
3465 | mddev->safemode = 0; | |
070dc6dd | 3466 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3467 | } |
3468 | err = 0; | |
3469 | } else | |
3470 | err = -EBUSY; | |
9e653b63 | 3471 | spin_unlock_irq(&mddev->write_lock); |
5bf29597 N |
3472 | } else |
3473 | err = -EINVAL; | |
9e653b63 N |
3474 | break; |
3475 | case active: | |
3476 | if (mddev->pers) { | |
3477 | restart_array(mddev); | |
070dc6dd | 3478 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
3479 | wake_up(&mddev->sb_wait); |
3480 | err = 0; | |
3481 | } else { | |
3482 | mddev->ro = 0; | |
648b629e | 3483 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3484 | err = do_md_run(mddev); |
3485 | } | |
3486 | break; | |
3487 | case write_pending: | |
3488 | case active_idle: | |
3489 | /* these cannot be set */ | |
3490 | break; | |
3491 | } | |
3492 | if (err) | |
3493 | return err; | |
0fd62b86 | 3494 | else { |
00bcb4ac | 3495 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
9e653b63 | 3496 | return len; |
0fd62b86 | 3497 | } |
9e653b63 | 3498 | } |
80ca3a44 N |
3499 | static struct md_sysfs_entry md_array_state = |
3500 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 3501 | |
1e50915f RB |
3502 | static ssize_t |
3503 | max_corrected_read_errors_show(mddev_t *mddev, char *page) { | |
3504 | return sprintf(page, "%d\n", | |
3505 | atomic_read(&mddev->max_corr_read_errors)); | |
3506 | } | |
3507 | ||
3508 | static ssize_t | |
3509 | max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len) | |
3510 | { | |
3511 | char *e; | |
3512 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3513 | ||
3514 | if (*buf && (*e == 0 || *e == '\n')) { | |
3515 | atomic_set(&mddev->max_corr_read_errors, n); | |
3516 | return len; | |
3517 | } | |
3518 | return -EINVAL; | |
3519 | } | |
3520 | ||
3521 | static struct md_sysfs_entry max_corr_read_errors = | |
3522 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3523 | max_corrected_read_errors_store); | |
3524 | ||
6d7ff738 N |
3525 | static ssize_t |
3526 | null_show(mddev_t *mddev, char *page) | |
3527 | { | |
3528 | return -EINVAL; | |
3529 | } | |
3530 | ||
3531 | static ssize_t | |
3532 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
3533 | { | |
3534 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3535 | /* The new device is added to the array. | |
3536 | * If the array has a persistent superblock, we read the | |
3537 | * superblock to initialise info and check validity. | |
3538 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3539 | * which mainly checks size. | |
3540 | */ | |
3541 | char *e; | |
3542 | int major = simple_strtoul(buf, &e, 10); | |
3543 | int minor; | |
3544 | dev_t dev; | |
3545 | mdk_rdev_t *rdev; | |
3546 | int err; | |
3547 | ||
3548 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3549 | return -EINVAL; | |
3550 | minor = simple_strtoul(e+1, &e, 10); | |
3551 | if (*e && *e != '\n') | |
3552 | return -EINVAL; | |
3553 | dev = MKDEV(major, minor); | |
3554 | if (major != MAJOR(dev) || | |
3555 | minor != MINOR(dev)) | |
3556 | return -EOVERFLOW; | |
3557 | ||
3558 | ||
3559 | if (mddev->persistent) { | |
3560 | rdev = md_import_device(dev, mddev->major_version, | |
3561 | mddev->minor_version); | |
3562 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3563 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
3564 | mdk_rdev_t, same_set); | |
3565 | err = super_types[mddev->major_version] | |
3566 | .load_super(rdev, rdev0, mddev->minor_version); | |
3567 | if (err < 0) | |
3568 | goto out; | |
3569 | } | |
c5d79adb N |
3570 | } else if (mddev->external) |
3571 | rdev = md_import_device(dev, -2, -1); | |
3572 | else | |
6d7ff738 N |
3573 | rdev = md_import_device(dev, -1, -1); |
3574 | ||
3575 | if (IS_ERR(rdev)) | |
3576 | return PTR_ERR(rdev); | |
3577 | err = bind_rdev_to_array(rdev, mddev); | |
3578 | out: | |
3579 | if (err) | |
3580 | export_rdev(rdev); | |
3581 | return err ? err : len; | |
3582 | } | |
3583 | ||
3584 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 3585 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 3586 | |
9b1d1dac PC |
3587 | static ssize_t |
3588 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
3589 | { | |
3590 | char *end; | |
3591 | unsigned long chunk, end_chunk; | |
3592 | ||
3593 | if (!mddev->bitmap) | |
3594 | goto out; | |
3595 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3596 | while (*buf) { | |
3597 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3598 | if (buf == end) break; | |
3599 | if (*end == '-') { /* range */ | |
3600 | buf = end + 1; | |
3601 | end_chunk = simple_strtoul(buf, &end, 0); | |
3602 | if (buf == end) break; | |
3603 | } | |
3604 | if (*end && !isspace(*end)) break; | |
3605 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 3606 | buf = skip_spaces(end); |
9b1d1dac PC |
3607 | } |
3608 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3609 | out: | |
3610 | return len; | |
3611 | } | |
3612 | ||
3613 | static struct md_sysfs_entry md_bitmap = | |
3614 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3615 | ||
a35b0d69 N |
3616 | static ssize_t |
3617 | size_show(mddev_t *mddev, char *page) | |
3618 | { | |
58c0fed4 AN |
3619 | return sprintf(page, "%llu\n", |
3620 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3621 | } |
3622 | ||
d71f9f88 | 3623 | static int update_size(mddev_t *mddev, sector_t num_sectors); |
a35b0d69 N |
3624 | |
3625 | static ssize_t | |
3626 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
3627 | { | |
3628 | /* If array is inactive, we can reduce the component size, but | |
3629 | * not increase it (except from 0). | |
3630 | * If array is active, we can try an on-line resize | |
3631 | */ | |
b522adcd DW |
3632 | sector_t sectors; |
3633 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 3634 | |
58c0fed4 AN |
3635 | if (err < 0) |
3636 | return err; | |
a35b0d69 | 3637 | if (mddev->pers) { |
58c0fed4 | 3638 | err = update_size(mddev, sectors); |
850b2b42 | 3639 | md_update_sb(mddev, 1); |
a35b0d69 | 3640 | } else { |
58c0fed4 AN |
3641 | if (mddev->dev_sectors == 0 || |
3642 | mddev->dev_sectors > sectors) | |
3643 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
3644 | else |
3645 | err = -ENOSPC; | |
3646 | } | |
3647 | return err ? err : len; | |
3648 | } | |
3649 | ||
3650 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3651 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3652 | |
8bb93aac N |
3653 | |
3654 | /* Metdata version. | |
e691063a N |
3655 | * This is one of |
3656 | * 'none' for arrays with no metadata (good luck...) | |
3657 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
3658 | * or N.M for internally known formats |
3659 | */ | |
3660 | static ssize_t | |
3661 | metadata_show(mddev_t *mddev, char *page) | |
3662 | { | |
3663 | if (mddev->persistent) | |
3664 | return sprintf(page, "%d.%d\n", | |
3665 | mddev->major_version, mddev->minor_version); | |
e691063a N |
3666 | else if (mddev->external) |
3667 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
3668 | else |
3669 | return sprintf(page, "none\n"); | |
3670 | } | |
3671 | ||
3672 | static ssize_t | |
3673 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
3674 | { | |
3675 | int major, minor; | |
3676 | char *e; | |
ea43ddd8 N |
3677 | /* Changing the details of 'external' metadata is |
3678 | * always permitted. Otherwise there must be | |
3679 | * no devices attached to the array. | |
3680 | */ | |
3681 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3682 | ; | |
3683 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
3684 | return -EBUSY; |
3685 | ||
3686 | if (cmd_match(buf, "none")) { | |
3687 | mddev->persistent = 0; | |
e691063a N |
3688 | mddev->external = 0; |
3689 | mddev->major_version = 0; | |
3690 | mddev->minor_version = 90; | |
3691 | return len; | |
3692 | } | |
3693 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 3694 | size_t namelen = len-9; |
e691063a N |
3695 | if (namelen >= sizeof(mddev->metadata_type)) |
3696 | namelen = sizeof(mddev->metadata_type)-1; | |
3697 | strncpy(mddev->metadata_type, buf+9, namelen); | |
3698 | mddev->metadata_type[namelen] = 0; | |
3699 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
3700 | mddev->metadata_type[--namelen] = 0; | |
3701 | mddev->persistent = 0; | |
3702 | mddev->external = 1; | |
8bb93aac N |
3703 | mddev->major_version = 0; |
3704 | mddev->minor_version = 90; | |
3705 | return len; | |
3706 | } | |
3707 | major = simple_strtoul(buf, &e, 10); | |
3708 | if (e==buf || *e != '.') | |
3709 | return -EINVAL; | |
3710 | buf = e+1; | |
3711 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 3712 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 3713 | return -EINVAL; |
50511da3 | 3714 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
3715 | return -ENOENT; |
3716 | mddev->major_version = major; | |
3717 | mddev->minor_version = minor; | |
3718 | mddev->persistent = 1; | |
e691063a | 3719 | mddev->external = 0; |
8bb93aac N |
3720 | return len; |
3721 | } | |
3722 | ||
3723 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 3724 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 3725 | |
24dd469d | 3726 | static ssize_t |
7eec314d | 3727 | action_show(mddev_t *mddev, char *page) |
24dd469d | 3728 | { |
7eec314d | 3729 | char *type = "idle"; |
b6a9ce68 N |
3730 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
3731 | type = "frozen"; | |
3732 | else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
2b12ab6d | 3733 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
3734 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3735 | type = "reshape"; | |
3736 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
3737 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
3738 | type = "resync"; | |
3739 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
3740 | type = "check"; | |
3741 | else | |
3742 | type = "repair"; | |
72a23c21 | 3743 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
3744 | type = "recover"; |
3745 | } | |
3746 | return sprintf(page, "%s\n", type); | |
3747 | } | |
3748 | ||
7ebc0be7 N |
3749 | static void reap_sync_thread(mddev_t *mddev); |
3750 | ||
24dd469d | 3751 | static ssize_t |
7eec314d | 3752 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 3753 | { |
7eec314d N |
3754 | if (!mddev->pers || !mddev->pers->sync_request) |
3755 | return -EINVAL; | |
3756 | ||
b6a9ce68 N |
3757 | if (cmd_match(page, "frozen")) |
3758 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3759 | else | |
3760 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3761 | ||
3762 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
7eec314d N |
3763 | if (mddev->sync_thread) { |
3764 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7ebc0be7 | 3765 | reap_sync_thread(mddev); |
7eec314d | 3766 | } |
03c902e1 N |
3767 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
3768 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 3769 | return -EBUSY; |
72a23c21 NB |
3770 | else if (cmd_match(page, "resync")) |
3771 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3772 | else if (cmd_match(page, "recover")) { | |
3773 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 3774 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 3775 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
3776 | int err; |
3777 | if (mddev->pers->start_reshape == NULL) | |
3778 | return -EINVAL; | |
3779 | err = mddev->pers->start_reshape(mddev); | |
3780 | if (err) | |
3781 | return err; | |
a99ac971 | 3782 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 3783 | } else { |
bce74dac | 3784 | if (cmd_match(page, "check")) |
7eec314d | 3785 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 3786 | else if (!cmd_match(page, "repair")) |
7eec314d N |
3787 | return -EINVAL; |
3788 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
3789 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 3790 | } |
03c902e1 | 3791 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 3792 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 3793 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
3794 | return len; |
3795 | } | |
3796 | ||
9d88883e | 3797 | static ssize_t |
96de1e66 | 3798 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
3799 | { |
3800 | return sprintf(page, "%llu\n", | |
3801 | (unsigned long long) mddev->resync_mismatches); | |
3802 | } | |
3803 | ||
80ca3a44 N |
3804 | static struct md_sysfs_entry md_scan_mode = |
3805 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 3806 | |
96de1e66 | 3807 | |
80ca3a44 | 3808 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 3809 | |
88202a0c N |
3810 | static ssize_t |
3811 | sync_min_show(mddev_t *mddev, char *page) | |
3812 | { | |
3813 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
3814 | mddev->sync_speed_min ? "local": "system"); | |
3815 | } | |
3816 | ||
3817 | static ssize_t | |
3818 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
3819 | { | |
3820 | int min; | |
3821 | char *e; | |
3822 | if (strncmp(buf, "system", 6)==0) { | |
3823 | mddev->sync_speed_min = 0; | |
3824 | return len; | |
3825 | } | |
3826 | min = simple_strtoul(buf, &e, 10); | |
3827 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
3828 | return -EINVAL; | |
3829 | mddev->sync_speed_min = min; | |
3830 | return len; | |
3831 | } | |
3832 | ||
3833 | static struct md_sysfs_entry md_sync_min = | |
3834 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
3835 | ||
3836 | static ssize_t | |
3837 | sync_max_show(mddev_t *mddev, char *page) | |
3838 | { | |
3839 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
3840 | mddev->sync_speed_max ? "local": "system"); | |
3841 | } | |
3842 | ||
3843 | static ssize_t | |
3844 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
3845 | { | |
3846 | int max; | |
3847 | char *e; | |
3848 | if (strncmp(buf, "system", 6)==0) { | |
3849 | mddev->sync_speed_max = 0; | |
3850 | return len; | |
3851 | } | |
3852 | max = simple_strtoul(buf, &e, 10); | |
3853 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
3854 | return -EINVAL; | |
3855 | mddev->sync_speed_max = max; | |
3856 | return len; | |
3857 | } | |
3858 | ||
3859 | static struct md_sysfs_entry md_sync_max = | |
3860 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
3861 | ||
d7f3d291 IP |
3862 | static ssize_t |
3863 | degraded_show(mddev_t *mddev, char *page) | |
3864 | { | |
3865 | return sprintf(page, "%d\n", mddev->degraded); | |
3866 | } | |
3867 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 3868 | |
90b08710 BS |
3869 | static ssize_t |
3870 | sync_force_parallel_show(mddev_t *mddev, char *page) | |
3871 | { | |
3872 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
3873 | } | |
3874 | ||
3875 | static ssize_t | |
3876 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) | |
3877 | { | |
3878 | long n; | |
3879 | ||
3880 | if (strict_strtol(buf, 10, &n)) | |
3881 | return -EINVAL; | |
3882 | ||
3883 | if (n != 0 && n != 1) | |
3884 | return -EINVAL; | |
3885 | ||
3886 | mddev->parallel_resync = n; | |
3887 | ||
3888 | if (mddev->sync_thread) | |
3889 | wake_up(&resync_wait); | |
3890 | ||
3891 | return len; | |
3892 | } | |
3893 | ||
3894 | /* force parallel resync, even with shared block devices */ | |
3895 | static struct md_sysfs_entry md_sync_force_parallel = | |
3896 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
3897 | sync_force_parallel_show, sync_force_parallel_store); | |
3898 | ||
88202a0c N |
3899 | static ssize_t |
3900 | sync_speed_show(mddev_t *mddev, char *page) | |
3901 | { | |
3902 | unsigned long resync, dt, db; | |
d1a7c503 N |
3903 | if (mddev->curr_resync == 0) |
3904 | return sprintf(page, "none\n"); | |
9687a60c AN |
3905 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
3906 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 3907 | if (!dt) dt++; |
9687a60c AN |
3908 | db = resync - mddev->resync_mark_cnt; |
3909 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
3910 | } |
3911 | ||
80ca3a44 | 3912 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
3913 | |
3914 | static ssize_t | |
3915 | sync_completed_show(mddev_t *mddev, char *page) | |
3916 | { | |
58c0fed4 | 3917 | unsigned long max_sectors, resync; |
88202a0c | 3918 | |
acb180b0 N |
3919 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
3920 | return sprintf(page, "none\n"); | |
3921 | ||
88202a0c | 3922 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
58c0fed4 | 3923 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 3924 | else |
58c0fed4 | 3925 | max_sectors = mddev->dev_sectors; |
88202a0c | 3926 | |
acb180b0 | 3927 | resync = mddev->curr_resync_completed; |
58c0fed4 | 3928 | return sprintf(page, "%lu / %lu\n", resync, max_sectors); |
88202a0c N |
3929 | } |
3930 | ||
80ca3a44 | 3931 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 3932 | |
5e96ee65 NB |
3933 | static ssize_t |
3934 | min_sync_show(mddev_t *mddev, char *page) | |
3935 | { | |
3936 | return sprintf(page, "%llu\n", | |
3937 | (unsigned long long)mddev->resync_min); | |
3938 | } | |
3939 | static ssize_t | |
3940 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3941 | { | |
3942 | unsigned long long min; | |
3943 | if (strict_strtoull(buf, 10, &min)) | |
3944 | return -EINVAL; | |
3945 | if (min > mddev->resync_max) | |
3946 | return -EINVAL; | |
3947 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3948 | return -EBUSY; | |
3949 | ||
3950 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 3951 | if (mddev->chunk_sectors) { |
2ac06c33 | 3952 | sector_t temp = min; |
9d8f0363 | 3953 | if (sector_div(temp, mddev->chunk_sectors)) |
5e96ee65 NB |
3954 | return -EINVAL; |
3955 | } | |
3956 | mddev->resync_min = min; | |
3957 | ||
3958 | return len; | |
3959 | } | |
3960 | ||
3961 | static struct md_sysfs_entry md_min_sync = | |
3962 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
3963 | ||
c6207277 N |
3964 | static ssize_t |
3965 | max_sync_show(mddev_t *mddev, char *page) | |
3966 | { | |
3967 | if (mddev->resync_max == MaxSector) | |
3968 | return sprintf(page, "max\n"); | |
3969 | else | |
3970 | return sprintf(page, "%llu\n", | |
3971 | (unsigned long long)mddev->resync_max); | |
3972 | } | |
3973 | static ssize_t | |
3974 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3975 | { | |
3976 | if (strncmp(buf, "max", 3) == 0) | |
3977 | mddev->resync_max = MaxSector; | |
3978 | else { | |
5e96ee65 NB |
3979 | unsigned long long max; |
3980 | if (strict_strtoull(buf, 10, &max)) | |
3981 | return -EINVAL; | |
3982 | if (max < mddev->resync_min) | |
c6207277 N |
3983 | return -EINVAL; |
3984 | if (max < mddev->resync_max && | |
4d484a4a | 3985 | mddev->ro == 0 && |
c6207277 N |
3986 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
3987 | return -EBUSY; | |
3988 | ||
3989 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 3990 | if (mddev->chunk_sectors) { |
2ac06c33 | 3991 | sector_t temp = max; |
9d8f0363 | 3992 | if (sector_div(temp, mddev->chunk_sectors)) |
c6207277 N |
3993 | return -EINVAL; |
3994 | } | |
3995 | mddev->resync_max = max; | |
3996 | } | |
3997 | wake_up(&mddev->recovery_wait); | |
3998 | return len; | |
3999 | } | |
4000 | ||
4001 | static struct md_sysfs_entry md_max_sync = | |
4002 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4003 | ||
e464eafd N |
4004 | static ssize_t |
4005 | suspend_lo_show(mddev_t *mddev, char *page) | |
4006 | { | |
4007 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4008 | } | |
4009 | ||
4010 | static ssize_t | |
4011 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
4012 | { | |
4013 | char *e; | |
4014 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4015 | ||
b8d966ef N |
4016 | if (mddev->pers == NULL || |
4017 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4018 | return -EINVAL; |
4019 | if (buf == e || (*e && *e != '\n')) | |
4020 | return -EINVAL; | |
4021 | if (new >= mddev->suspend_hi || | |
4022 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
4023 | mddev->suspend_lo = new; | |
4024 | mddev->pers->quiesce(mddev, 2); | |
4025 | return len; | |
4026 | } else | |
4027 | return -EINVAL; | |
4028 | } | |
4029 | static struct md_sysfs_entry md_suspend_lo = | |
4030 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4031 | ||
4032 | ||
4033 | static ssize_t | |
4034 | suspend_hi_show(mddev_t *mddev, char *page) | |
4035 | { | |
4036 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4037 | } | |
4038 | ||
4039 | static ssize_t | |
4040 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
4041 | { | |
4042 | char *e; | |
4043 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4044 | ||
b8d966ef N |
4045 | if (mddev->pers == NULL || |
4046 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4047 | return -EINVAL; |
4048 | if (buf == e || (*e && *e != '\n')) | |
4049 | return -EINVAL; | |
4050 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
4051 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
4052 | mddev->suspend_hi = new; | |
4053 | mddev->pers->quiesce(mddev, 1); | |
4054 | mddev->pers->quiesce(mddev, 0); | |
4055 | return len; | |
4056 | } else | |
4057 | return -EINVAL; | |
4058 | } | |
4059 | static struct md_sysfs_entry md_suspend_hi = | |
4060 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4061 | ||
08a02ecd N |
4062 | static ssize_t |
4063 | reshape_position_show(mddev_t *mddev, char *page) | |
4064 | { | |
4065 | if (mddev->reshape_position != MaxSector) | |
4066 | return sprintf(page, "%llu\n", | |
4067 | (unsigned long long)mddev->reshape_position); | |
4068 | strcpy(page, "none\n"); | |
4069 | return 5; | |
4070 | } | |
4071 | ||
4072 | static ssize_t | |
4073 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
4074 | { | |
4075 | char *e; | |
4076 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4077 | if (mddev->pers) | |
4078 | return -EBUSY; | |
4079 | if (buf == e || (*e && *e != '\n')) | |
4080 | return -EINVAL; | |
4081 | mddev->reshape_position = new; | |
4082 | mddev->delta_disks = 0; | |
4083 | mddev->new_level = mddev->level; | |
4084 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4085 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
08a02ecd N |
4086 | return len; |
4087 | } | |
4088 | ||
4089 | static struct md_sysfs_entry md_reshape_position = | |
4090 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4091 | reshape_position_store); | |
4092 | ||
b522adcd DW |
4093 | static ssize_t |
4094 | array_size_show(mddev_t *mddev, char *page) | |
4095 | { | |
4096 | if (mddev->external_size) | |
4097 | return sprintf(page, "%llu\n", | |
4098 | (unsigned long long)mddev->array_sectors/2); | |
4099 | else | |
4100 | return sprintf(page, "default\n"); | |
4101 | } | |
4102 | ||
4103 | static ssize_t | |
4104 | array_size_store(mddev_t *mddev, const char *buf, size_t len) | |
4105 | { | |
4106 | sector_t sectors; | |
4107 | ||
4108 | if (strncmp(buf, "default", 7) == 0) { | |
4109 | if (mddev->pers) | |
4110 | sectors = mddev->pers->size(mddev, 0, 0); | |
4111 | else | |
4112 | sectors = mddev->array_sectors; | |
4113 | ||
4114 | mddev->external_size = 0; | |
4115 | } else { | |
4116 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
4117 | return -EINVAL; | |
4118 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
2b69c839 | 4119 | return -E2BIG; |
b522adcd DW |
4120 | |
4121 | mddev->external_size = 1; | |
4122 | } | |
4123 | ||
4124 | mddev->array_sectors = sectors; | |
4125 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e N |
4126 | if (mddev->pers) |
4127 | revalidate_disk(mddev->gendisk); | |
b522adcd DW |
4128 | |
4129 | return len; | |
4130 | } | |
4131 | ||
4132 | static struct md_sysfs_entry md_array_size = | |
4133 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4134 | array_size_store); | |
e464eafd | 4135 | |
eae1701f N |
4136 | static struct attribute *md_default_attrs[] = { |
4137 | &md_level.attr, | |
d4dbd025 | 4138 | &md_layout.attr, |
eae1701f | 4139 | &md_raid_disks.attr, |
3b34380a | 4140 | &md_chunk_size.attr, |
a35b0d69 | 4141 | &md_size.attr, |
a94213b1 | 4142 | &md_resync_start.attr, |
8bb93aac | 4143 | &md_metadata.attr, |
6d7ff738 | 4144 | &md_new_device.attr, |
16f17b39 | 4145 | &md_safe_delay.attr, |
9e653b63 | 4146 | &md_array_state.attr, |
08a02ecd | 4147 | &md_reshape_position.attr, |
b522adcd | 4148 | &md_array_size.attr, |
1e50915f | 4149 | &max_corr_read_errors.attr, |
411036fa N |
4150 | NULL, |
4151 | }; | |
4152 | ||
4153 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4154 | &md_scan_mode.attr, |
9d88883e | 4155 | &md_mismatches.attr, |
88202a0c N |
4156 | &md_sync_min.attr, |
4157 | &md_sync_max.attr, | |
4158 | &md_sync_speed.attr, | |
90b08710 | 4159 | &md_sync_force_parallel.attr, |
88202a0c | 4160 | &md_sync_completed.attr, |
5e96ee65 | 4161 | &md_min_sync.attr, |
c6207277 | 4162 | &md_max_sync.attr, |
e464eafd N |
4163 | &md_suspend_lo.attr, |
4164 | &md_suspend_hi.attr, | |
9b1d1dac | 4165 | &md_bitmap.attr, |
d7f3d291 | 4166 | &md_degraded.attr, |
eae1701f N |
4167 | NULL, |
4168 | }; | |
411036fa N |
4169 | static struct attribute_group md_redundancy_group = { |
4170 | .name = NULL, | |
4171 | .attrs = md_redundancy_attrs, | |
4172 | }; | |
4173 | ||
eae1701f N |
4174 | |
4175 | static ssize_t | |
4176 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4177 | { | |
4178 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
4179 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 4180 | ssize_t rv; |
eae1701f N |
4181 | |
4182 | if (!entry->show) | |
4183 | return -EIO; | |
5dc5cf7d IM |
4184 | rv = mddev_lock(mddev); |
4185 | if (!rv) { | |
4186 | rv = entry->show(mddev, page); | |
4187 | mddev_unlock(mddev); | |
4188 | } | |
96de1e66 | 4189 | return rv; |
eae1701f N |
4190 | } |
4191 | ||
4192 | static ssize_t | |
4193 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4194 | const char *page, size_t length) | |
4195 | { | |
4196 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
4197 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 4198 | ssize_t rv; |
eae1701f N |
4199 | |
4200 | if (!entry->store) | |
4201 | return -EIO; | |
67463acb N |
4202 | if (!capable(CAP_SYS_ADMIN)) |
4203 | return -EACCES; | |
5dc5cf7d | 4204 | rv = mddev_lock(mddev); |
d3374825 N |
4205 | if (mddev->hold_active == UNTIL_IOCTL) |
4206 | mddev->hold_active = 0; | |
5dc5cf7d IM |
4207 | if (!rv) { |
4208 | rv = entry->store(mddev, page, length); | |
4209 | mddev_unlock(mddev); | |
4210 | } | |
96de1e66 | 4211 | return rv; |
eae1701f N |
4212 | } |
4213 | ||
4214 | static void md_free(struct kobject *ko) | |
4215 | { | |
4216 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
a21d1504 N |
4217 | |
4218 | if (mddev->sysfs_state) | |
4219 | sysfs_put(mddev->sysfs_state); | |
4220 | ||
4221 | if (mddev->gendisk) { | |
4222 | del_gendisk(mddev->gendisk); | |
4223 | put_disk(mddev->gendisk); | |
4224 | } | |
4225 | if (mddev->queue) | |
4226 | blk_cleanup_queue(mddev->queue); | |
4227 | ||
eae1701f N |
4228 | kfree(mddev); |
4229 | } | |
4230 | ||
52cf25d0 | 4231 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4232 | .show = md_attr_show, |
4233 | .store = md_attr_store, | |
4234 | }; | |
4235 | static struct kobj_type md_ktype = { | |
4236 | .release = md_free, | |
4237 | .sysfs_ops = &md_sysfs_ops, | |
4238 | .default_attrs = md_default_attrs, | |
4239 | }; | |
4240 | ||
1da177e4 LT |
4241 | int mdp_major = 0; |
4242 | ||
5fd3a17e DW |
4243 | static void mddev_delayed_delete(struct work_struct *ws) |
4244 | { | |
4245 | mddev_t *mddev = container_of(ws, mddev_t, del_work); | |
4246 | ||
43a70507 | 4247 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4248 | kobject_del(&mddev->kobj); |
4249 | kobject_put(&mddev->kobj); | |
4250 | } | |
4251 | ||
efeb53c0 | 4252 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4253 | { |
48c9c27b | 4254 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
4255 | mddev_t *mddev = mddev_find(dev); |
4256 | struct gendisk *disk; | |
efeb53c0 N |
4257 | int partitioned; |
4258 | int shift; | |
4259 | int unit; | |
3830c62f | 4260 | int error; |
1da177e4 LT |
4261 | |
4262 | if (!mddev) | |
efeb53c0 N |
4263 | return -ENODEV; |
4264 | ||
4265 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4266 | shift = partitioned ? MdpMinorShift : 0; | |
4267 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4268 | |
e804ac78 TH |
4269 | /* wait for any previous instance of this device to be |
4270 | * completely removed (mddev_delayed_delete). | |
d3374825 | 4271 | */ |
e804ac78 | 4272 | flush_workqueue(md_misc_wq); |
d3374825 | 4273 | |
48c9c27b | 4274 | mutex_lock(&disks_mutex); |
0909dc44 N |
4275 | error = -EEXIST; |
4276 | if (mddev->gendisk) | |
4277 | goto abort; | |
efeb53c0 N |
4278 | |
4279 | if (name) { | |
4280 | /* Need to ensure that 'name' is not a duplicate. | |
4281 | */ | |
4282 | mddev_t *mddev2; | |
4283 | spin_lock(&all_mddevs_lock); | |
4284 | ||
4285 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4286 | if (mddev2->gendisk && | |
4287 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4288 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4289 | goto abort; |
efeb53c0 N |
4290 | } |
4291 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4292 | } |
8b765398 | 4293 | |
0909dc44 | 4294 | error = -ENOMEM; |
8b765398 | 4295 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4296 | if (!mddev->queue) |
4297 | goto abort; | |
409c57f3 N |
4298 | mddev->queue->queuedata = mddev; |
4299 | ||
409c57f3 | 4300 | blk_queue_make_request(mddev->queue, md_make_request); |
8b765398 | 4301 | |
1da177e4 LT |
4302 | disk = alloc_disk(1 << shift); |
4303 | if (!disk) { | |
8b765398 N |
4304 | blk_cleanup_queue(mddev->queue); |
4305 | mddev->queue = NULL; | |
0909dc44 | 4306 | goto abort; |
1da177e4 | 4307 | } |
efeb53c0 | 4308 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4309 | disk->first_minor = unit << shift; |
efeb53c0 N |
4310 | if (name) |
4311 | strcpy(disk->disk_name, name); | |
4312 | else if (partitioned) | |
1da177e4 | 4313 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4314 | else |
1da177e4 | 4315 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4316 | disk->fops = &md_fops; |
4317 | disk->private_data = mddev; | |
4318 | disk->queue = mddev->queue; | |
92850bbd | 4319 | /* Allow extended partitions. This makes the |
d3374825 | 4320 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4321 | * remove it now. |
4322 | */ | |
4323 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 LT |
4324 | add_disk(disk); |
4325 | mddev->gendisk = disk; | |
ed9e1982 TH |
4326 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4327 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4328 | if (error) { |
4329 | /* This isn't possible, but as kobject_init_and_add is marked | |
4330 | * __must_check, we must do something with the result | |
4331 | */ | |
5e55e2f5 N |
4332 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4333 | disk->disk_name); | |
0909dc44 N |
4334 | error = 0; |
4335 | } | |
00bcb4ac N |
4336 | if (mddev->kobj.sd && |
4337 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 4338 | printk(KERN_DEBUG "pointless warning\n"); |
be20e6c6 DW |
4339 | |
4340 | blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); | |
0909dc44 N |
4341 | abort: |
4342 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 4343 | if (!error && mddev->kobj.sd) { |
3830c62f | 4344 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 4345 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 4346 | } |
d3374825 | 4347 | mddev_put(mddev); |
0909dc44 | 4348 | return error; |
efeb53c0 N |
4349 | } |
4350 | ||
4351 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4352 | { | |
4353 | md_alloc(dev, NULL); | |
1da177e4 LT |
4354 | return NULL; |
4355 | } | |
4356 | ||
efeb53c0 N |
4357 | static int add_named_array(const char *val, struct kernel_param *kp) |
4358 | { | |
4359 | /* val must be "md_*" where * is not all digits. | |
4360 | * We allocate an array with a large free minor number, and | |
4361 | * set the name to val. val must not already be an active name. | |
4362 | */ | |
4363 | int len = strlen(val); | |
4364 | char buf[DISK_NAME_LEN]; | |
4365 | ||
4366 | while (len && val[len-1] == '\n') | |
4367 | len--; | |
4368 | if (len >= DISK_NAME_LEN) | |
4369 | return -E2BIG; | |
4370 | strlcpy(buf, val, len+1); | |
4371 | if (strncmp(buf, "md_", 3) != 0) | |
4372 | return -EINVAL; | |
4373 | return md_alloc(0, buf); | |
4374 | } | |
4375 | ||
1da177e4 LT |
4376 | static void md_safemode_timeout(unsigned long data) |
4377 | { | |
4378 | mddev_t *mddev = (mddev_t *) data; | |
4379 | ||
0fd62b86 NB |
4380 | if (!atomic_read(&mddev->writes_pending)) { |
4381 | mddev->safemode = 1; | |
4382 | if (mddev->external) | |
00bcb4ac | 4383 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4384 | } |
1da177e4 LT |
4385 | md_wakeup_thread(mddev->thread); |
4386 | } | |
4387 | ||
6ff8d8ec | 4388 | static int start_dirty_degraded; |
1da177e4 | 4389 | |
390ee602 | 4390 | int md_run(mddev_t *mddev) |
1da177e4 | 4391 | { |
2604b703 | 4392 | int err; |
1da177e4 | 4393 | mdk_rdev_t *rdev; |
2604b703 | 4394 | struct mdk_personality *pers; |
1da177e4 | 4395 | |
a757e64c N |
4396 | if (list_empty(&mddev->disks)) |
4397 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4398 | return -EINVAL; |
1da177e4 LT |
4399 | |
4400 | if (mddev->pers) | |
4401 | return -EBUSY; | |
bb4f1e9d N |
4402 | /* Cannot run until previous stop completes properly */ |
4403 | if (mddev->sysfs_active) | |
4404 | return -EBUSY; | |
b6eb127d | 4405 | |
1da177e4 LT |
4406 | /* |
4407 | * Analyze all RAID superblock(s) | |
4408 | */ | |
1ec4a939 N |
4409 | if (!mddev->raid_disks) { |
4410 | if (!mddev->persistent) | |
4411 | return -EINVAL; | |
a757e64c | 4412 | analyze_sbs(mddev); |
1ec4a939 | 4413 | } |
1da177e4 | 4414 | |
d9d166c2 N |
4415 | if (mddev->level != LEVEL_NONE) |
4416 | request_module("md-level-%d", mddev->level); | |
4417 | else if (mddev->clevel[0]) | |
4418 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4419 | |
4420 | /* | |
4421 | * Drop all container device buffers, from now on | |
4422 | * the only valid external interface is through the md | |
4423 | * device. | |
1da177e4 | 4424 | */ |
159ec1fc | 4425 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 4426 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4427 | continue; |
4428 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4429 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4430 | |
4431 | /* perform some consistency tests on the device. | |
4432 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4433 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4434 | */ |
0f420358 | 4435 | if (rdev->data_offset < rdev->sb_start) { |
58c0fed4 AN |
4436 | if (mddev->dev_sectors && |
4437 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4438 | > rdev->sb_start) { |
f0d76d70 N |
4439 | printk("md: %s: data overlaps metadata\n", |
4440 | mdname(mddev)); | |
4441 | return -EINVAL; | |
4442 | } | |
4443 | } else { | |
0f420358 | 4444 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4445 | > rdev->data_offset) { |
4446 | printk("md: %s: metadata overlaps data\n", | |
4447 | mdname(mddev)); | |
4448 | return -EINVAL; | |
4449 | } | |
4450 | } | |
00bcb4ac | 4451 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
4452 | } |
4453 | ||
a167f663 N |
4454 | if (mddev->bio_set == NULL) |
4455 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, sizeof(mddev)); | |
4456 | ||
1da177e4 | 4457 | spin_lock(&pers_lock); |
d9d166c2 | 4458 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 4459 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 4460 | spin_unlock(&pers_lock); |
d9d166c2 N |
4461 | if (mddev->level != LEVEL_NONE) |
4462 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
4463 | mddev->level); | |
4464 | else | |
4465 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
4466 | mddev->clevel); | |
1da177e4 LT |
4467 | return -EINVAL; |
4468 | } | |
2604b703 | 4469 | mddev->pers = pers; |
1da177e4 | 4470 | spin_unlock(&pers_lock); |
34817e8c N |
4471 | if (mddev->level != pers->level) { |
4472 | mddev->level = pers->level; | |
4473 | mddev->new_level = pers->level; | |
4474 | } | |
d9d166c2 | 4475 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 4476 | |
f6705578 | 4477 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 4478 | pers->start_reshape == NULL) { |
f6705578 N |
4479 | /* This personality cannot handle reshaping... */ |
4480 | mddev->pers = NULL; | |
4481 | module_put(pers->owner); | |
4482 | return -EINVAL; | |
4483 | } | |
4484 | ||
7dd5e7c3 N |
4485 | if (pers->sync_request) { |
4486 | /* Warn if this is a potentially silly | |
4487 | * configuration. | |
4488 | */ | |
4489 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4490 | mdk_rdev_t *rdev2; | |
7dd5e7c3 | 4491 | int warned = 0; |
159ec1fc CR |
4492 | |
4493 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
4494 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
7dd5e7c3 N |
4495 | if (rdev < rdev2 && |
4496 | rdev->bdev->bd_contains == | |
4497 | rdev2->bdev->bd_contains) { | |
4498 | printk(KERN_WARNING | |
4499 | "%s: WARNING: %s appears to be" | |
4500 | " on the same physical disk as" | |
4501 | " %s.\n", | |
4502 | mdname(mddev), | |
4503 | bdevname(rdev->bdev,b), | |
4504 | bdevname(rdev2->bdev,b2)); | |
4505 | warned = 1; | |
4506 | } | |
4507 | } | |
159ec1fc | 4508 | |
7dd5e7c3 N |
4509 | if (warned) |
4510 | printk(KERN_WARNING | |
4511 | "True protection against single-disk" | |
4512 | " failure might be compromised.\n"); | |
4513 | } | |
4514 | ||
657390d2 | 4515 | mddev->recovery = 0; |
58c0fed4 AN |
4516 | /* may be over-ridden by personality */ |
4517 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4518 | ||
6ff8d8ec | 4519 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 4520 | |
0f9552b5 | 4521 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
4522 | mddev->ro = 2; /* read-only, but switch on first write */ |
4523 | ||
b15c2e57 | 4524 | err = mddev->pers->run(mddev); |
13e53df3 AN |
4525 | if (err) |
4526 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
b522adcd DW |
4527 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
4528 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
4529 | " but 'external_size' not in effect?\n", __func__); | |
4530 | printk(KERN_ERR | |
4531 | "md: invalid array_size %llu > default size %llu\n", | |
4532 | (unsigned long long)mddev->array_sectors / 2, | |
4533 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
4534 | err = -EINVAL; | |
4535 | mddev->pers->stop(mddev); | |
4536 | } | |
4537 | if (err == 0 && mddev->pers->sync_request) { | |
b15c2e57 N |
4538 | err = bitmap_create(mddev); |
4539 | if (err) { | |
4540 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
4541 | mdname(mddev), err); | |
4542 | mddev->pers->stop(mddev); | |
4543 | } | |
4544 | } | |
1da177e4 | 4545 | if (err) { |
1da177e4 LT |
4546 | module_put(mddev->pers->owner); |
4547 | mddev->pers = NULL; | |
32a7627c N |
4548 | bitmap_destroy(mddev); |
4549 | return err; | |
1da177e4 | 4550 | } |
5e55e2f5 | 4551 | if (mddev->pers->sync_request) { |
00bcb4ac N |
4552 | if (mddev->kobj.sd && |
4553 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
4554 | printk(KERN_WARNING |
4555 | "md: cannot register extra attributes for %s\n", | |
4556 | mdname(mddev)); | |
00bcb4ac | 4557 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 4558 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
4559 | mddev->ro = 0; |
4560 | ||
1da177e4 | 4561 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
4562 | atomic_set(&mddev->max_corr_read_errors, |
4563 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
4564 | mddev->safemode = 0; |
4565 | mddev->safemode_timer.function = md_safemode_timeout; | |
4566 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 4567 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 4568 | mddev->in_sync = 1; |
0ca69886 N |
4569 | smp_wmb(); |
4570 | mddev->ready = 1; | |
159ec1fc | 4571 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
4572 | if (rdev->raid_disk >= 0) { |
4573 | char nm[20]; | |
4574 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 | 4575 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
00bcb4ac | 4576 | /* failure here is OK */; |
86e6ffdd | 4577 | } |
1da177e4 LT |
4578 | |
4579 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4580 | ||
850b2b42 N |
4581 | if (mddev->flags) |
4582 | md_update_sb(mddev, 0); | |
1da177e4 | 4583 | |
0b8c9de0 N |
4584 | md_wakeup_thread(mddev->thread); |
4585 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 4586 | |
d7603b7e | 4587 | md_new_event(mddev); |
00bcb4ac N |
4588 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
4589 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 4590 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
4591 | return 0; |
4592 | } | |
390ee602 | 4593 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 4594 | |
fe60b014 N |
4595 | static int do_md_run(mddev_t *mddev) |
4596 | { | |
4597 | int err; | |
4598 | ||
4599 | err = md_run(mddev); | |
4600 | if (err) | |
4601 | goto out; | |
69e51b44 N |
4602 | err = bitmap_load(mddev); |
4603 | if (err) { | |
4604 | bitmap_destroy(mddev); | |
4605 | goto out; | |
4606 | } | |
fe60b014 N |
4607 | set_capacity(mddev->gendisk, mddev->array_sectors); |
4608 | revalidate_disk(mddev->gendisk); | |
4609 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); | |
4610 | out: | |
4611 | return err; | |
4612 | } | |
4613 | ||
1da177e4 LT |
4614 | static int restart_array(mddev_t *mddev) |
4615 | { | |
4616 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 4617 | |
80fab1d7 | 4618 | /* Complain if it has no devices */ |
1da177e4 | 4619 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
4620 | return -ENXIO; |
4621 | if (!mddev->pers) | |
4622 | return -EINVAL; | |
4623 | if (!mddev->ro) | |
4624 | return -EBUSY; | |
4625 | mddev->safemode = 0; | |
4626 | mddev->ro = 0; | |
4627 | set_disk_ro(disk, 0); | |
4628 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
4629 | mdname(mddev)); | |
4630 | /* Kick recovery or resync if necessary */ | |
4631 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4632 | md_wakeup_thread(mddev->thread); | |
4633 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 4634 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 4635 | return 0; |
1da177e4 LT |
4636 | } |
4637 | ||
acc55e22 N |
4638 | /* similar to deny_write_access, but accounts for our holding a reference |
4639 | * to the file ourselves */ | |
4640 | static int deny_bitmap_write_access(struct file * file) | |
4641 | { | |
4642 | struct inode *inode = file->f_mapping->host; | |
4643 | ||
4644 | spin_lock(&inode->i_lock); | |
4645 | if (atomic_read(&inode->i_writecount) > 1) { | |
4646 | spin_unlock(&inode->i_lock); | |
4647 | return -ETXTBSY; | |
4648 | } | |
4649 | atomic_set(&inode->i_writecount, -1); | |
4650 | spin_unlock(&inode->i_lock); | |
4651 | ||
4652 | return 0; | |
4653 | } | |
4654 | ||
43a70507 | 4655 | void restore_bitmap_write_access(struct file *file) |
acc55e22 N |
4656 | { |
4657 | struct inode *inode = file->f_mapping->host; | |
4658 | ||
4659 | spin_lock(&inode->i_lock); | |
4660 | atomic_set(&inode->i_writecount, 1); | |
4661 | spin_unlock(&inode->i_lock); | |
4662 | } | |
4663 | ||
6177b472 N |
4664 | static void md_clean(mddev_t *mddev) |
4665 | { | |
4666 | mddev->array_sectors = 0; | |
4667 | mddev->external_size = 0; | |
4668 | mddev->dev_sectors = 0; | |
4669 | mddev->raid_disks = 0; | |
4670 | mddev->recovery_cp = 0; | |
4671 | mddev->resync_min = 0; | |
4672 | mddev->resync_max = MaxSector; | |
4673 | mddev->reshape_position = MaxSector; | |
4674 | mddev->external = 0; | |
4675 | mddev->persistent = 0; | |
4676 | mddev->level = LEVEL_NONE; | |
4677 | mddev->clevel[0] = 0; | |
4678 | mddev->flags = 0; | |
4679 | mddev->ro = 0; | |
4680 | mddev->metadata_type[0] = 0; | |
4681 | mddev->chunk_sectors = 0; | |
4682 | mddev->ctime = mddev->utime = 0; | |
4683 | mddev->layout = 0; | |
4684 | mddev->max_disks = 0; | |
4685 | mddev->events = 0; | |
a8707c08 | 4686 | mddev->can_decrease_events = 0; |
6177b472 N |
4687 | mddev->delta_disks = 0; |
4688 | mddev->new_level = LEVEL_NONE; | |
4689 | mddev->new_layout = 0; | |
4690 | mddev->new_chunk_sectors = 0; | |
4691 | mddev->curr_resync = 0; | |
4692 | mddev->resync_mismatches = 0; | |
4693 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
4694 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
4695 | mddev->recovery = 0; | |
4696 | mddev->in_sync = 0; | |
4697 | mddev->degraded = 0; | |
6177b472 N |
4698 | mddev->safemode = 0; |
4699 | mddev->bitmap_info.offset = 0; | |
4700 | mddev->bitmap_info.default_offset = 0; | |
4701 | mddev->bitmap_info.chunksize = 0; | |
4702 | mddev->bitmap_info.daemon_sleep = 0; | |
4703 | mddev->bitmap_info.max_write_behind = 0; | |
252ac522 | 4704 | mddev->plug = NULL; |
6177b472 N |
4705 | } |
4706 | ||
defad61a | 4707 | static void __md_stop_writes(mddev_t *mddev) |
a047e125 N |
4708 | { |
4709 | if (mddev->sync_thread) { | |
4710 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4711 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7ebc0be7 | 4712 | reap_sync_thread(mddev); |
a047e125 N |
4713 | } |
4714 | ||
4715 | del_timer_sync(&mddev->safemode_timer); | |
4716 | ||
4717 | bitmap_flush(mddev); | |
4718 | md_super_wait(mddev); | |
4719 | ||
4720 | if (!mddev->in_sync || mddev->flags) { | |
4721 | /* mark array as shutdown cleanly */ | |
4722 | mddev->in_sync = 1; | |
4723 | md_update_sb(mddev, 1); | |
4724 | } | |
4725 | } | |
defad61a N |
4726 | |
4727 | void md_stop_writes(mddev_t *mddev) | |
4728 | { | |
4729 | mddev_lock(mddev); | |
4730 | __md_stop_writes(mddev); | |
4731 | mddev_unlock(mddev); | |
4732 | } | |
390ee602 | 4733 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 4734 | |
390ee602 | 4735 | void md_stop(mddev_t *mddev) |
6177b472 | 4736 | { |
0ca69886 | 4737 | mddev->ready = 0; |
6177b472 N |
4738 | mddev->pers->stop(mddev); |
4739 | if (mddev->pers->sync_request && mddev->to_remove == NULL) | |
4740 | mddev->to_remove = &md_redundancy_group; | |
4741 | module_put(mddev->pers->owner); | |
4742 | mddev->pers = NULL; | |
cca9cf90 | 4743 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 4744 | } |
390ee602 | 4745 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 4746 | |
a4bd82d0 N |
4747 | static int md_set_readonly(mddev_t *mddev, int is_open) |
4748 | { | |
4749 | int err = 0; | |
4750 | mutex_lock(&mddev->open_mutex); | |
4751 | if (atomic_read(&mddev->openers) > is_open) { | |
4752 | printk("md: %s still in use.\n",mdname(mddev)); | |
4753 | err = -EBUSY; | |
4754 | goto out; | |
4755 | } | |
4756 | if (mddev->pers) { | |
defad61a | 4757 | __md_stop_writes(mddev); |
a4bd82d0 N |
4758 | |
4759 | err = -ENXIO; | |
4760 | if (mddev->ro==1) | |
4761 | goto out; | |
4762 | mddev->ro = 1; | |
4763 | set_disk_ro(mddev->gendisk, 1); | |
4764 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
00bcb4ac | 4765 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
a4bd82d0 N |
4766 | err = 0; |
4767 | } | |
4768 | out: | |
4769 | mutex_unlock(&mddev->open_mutex); | |
4770 | return err; | |
4771 | } | |
4772 | ||
9e653b63 N |
4773 | /* mode: |
4774 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
4775 | * 2 - stop but do not disassemble array |
4776 | */ | |
df5b20cf | 4777 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
1da177e4 | 4778 | { |
1da177e4 | 4779 | struct gendisk *disk = mddev->gendisk; |
c4647292 | 4780 | mdk_rdev_t *rdev; |
1da177e4 | 4781 | |
c8c00a69 | 4782 | mutex_lock(&mddev->open_mutex); |
bb4f1e9d N |
4783 | if (atomic_read(&mddev->openers) > is_open || |
4784 | mddev->sysfs_active) { | |
df5b20cf | 4785 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 N |
4786 | mutex_unlock(&mddev->open_mutex); |
4787 | return -EBUSY; | |
4788 | } | |
1da177e4 | 4789 | |
6e17b027 | 4790 | if (mddev->pers) { |
a4bd82d0 N |
4791 | if (mddev->ro) |
4792 | set_disk_ro(disk, 0); | |
409c57f3 | 4793 | |
defad61a | 4794 | __md_stop_writes(mddev); |
a4bd82d0 N |
4795 | md_stop(mddev); |
4796 | mddev->queue->merge_bvec_fn = NULL; | |
4797 | mddev->queue->unplug_fn = NULL; | |
4798 | mddev->queue->backing_dev_info.congested_fn = NULL; | |
6177b472 | 4799 | |
a4bd82d0 | 4800 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 4801 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 4802 | |
a4bd82d0 N |
4803 | list_for_each_entry(rdev, &mddev->disks, same_set) |
4804 | if (rdev->raid_disk >= 0) { | |
4805 | char nm[20]; | |
4806 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4807 | sysfs_remove_link(&mddev->kobj, nm); | |
4808 | } | |
c4647292 | 4809 | |
a4bd82d0 | 4810 | set_capacity(disk, 0); |
6e17b027 | 4811 | mutex_unlock(&mddev->open_mutex); |
a4bd82d0 | 4812 | revalidate_disk(disk); |
0d4ca600 | 4813 | |
a4bd82d0 N |
4814 | if (mddev->ro) |
4815 | mddev->ro = 0; | |
6e17b027 N |
4816 | } else |
4817 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
4818 | /* |
4819 | * Free resources if final stop | |
4820 | */ | |
9e653b63 | 4821 | if (mode == 0) { |
1da177e4 LT |
4822 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
4823 | ||
978f946b | 4824 | bitmap_destroy(mddev); |
c3d9714e N |
4825 | if (mddev->bitmap_info.file) { |
4826 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
4827 | fput(mddev->bitmap_info.file); | |
4828 | mddev->bitmap_info.file = NULL; | |
978f946b | 4829 | } |
c3d9714e | 4830 | mddev->bitmap_info.offset = 0; |
978f946b | 4831 | |
1da177e4 LT |
4832 | export_array(mddev); |
4833 | ||
6177b472 | 4834 | md_clean(mddev); |
934d9c23 | 4835 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
4836 | if (mddev->hold_active == UNTIL_STOP) |
4837 | mddev->hold_active = 0; | |
a4bd82d0 | 4838 | } |
3f9d99c1 | 4839 | blk_integrity_unregister(disk); |
d7603b7e | 4840 | md_new_event(mddev); |
00bcb4ac | 4841 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 4842 | return 0; |
1da177e4 LT |
4843 | } |
4844 | ||
fdee8ae4 | 4845 | #ifndef MODULE |
1da177e4 LT |
4846 | static void autorun_array(mddev_t *mddev) |
4847 | { | |
4848 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4849 | int err; |
4850 | ||
a757e64c | 4851 | if (list_empty(&mddev->disks)) |
1da177e4 | 4852 | return; |
1da177e4 LT |
4853 | |
4854 | printk(KERN_INFO "md: running: "); | |
4855 | ||
159ec1fc | 4856 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
4857 | char b[BDEVNAME_SIZE]; |
4858 | printk("<%s>", bdevname(rdev->bdev,b)); | |
4859 | } | |
4860 | printk("\n"); | |
4861 | ||
d710e138 | 4862 | err = do_md_run(mddev); |
1da177e4 LT |
4863 | if (err) { |
4864 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 4865 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
4866 | } |
4867 | } | |
4868 | ||
4869 | /* | |
4870 | * lets try to run arrays based on all disks that have arrived | |
4871 | * until now. (those are in pending_raid_disks) | |
4872 | * | |
4873 | * the method: pick the first pending disk, collect all disks with | |
4874 | * the same UUID, remove all from the pending list and put them into | |
4875 | * the 'same_array' list. Then order this list based on superblock | |
4876 | * update time (freshest comes first), kick out 'old' disks and | |
4877 | * compare superblocks. If everything's fine then run it. | |
4878 | * | |
4879 | * If "unit" is allocated, then bump its reference count | |
4880 | */ | |
4881 | static void autorun_devices(int part) | |
4882 | { | |
159ec1fc | 4883 | mdk_rdev_t *rdev0, *rdev, *tmp; |
1da177e4 LT |
4884 | mddev_t *mddev; |
4885 | char b[BDEVNAME_SIZE]; | |
4886 | ||
4887 | printk(KERN_INFO "md: autorun ...\n"); | |
4888 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 4889 | int unit; |
1da177e4 | 4890 | dev_t dev; |
ad01c9e3 | 4891 | LIST_HEAD(candidates); |
1da177e4 LT |
4892 | rdev0 = list_entry(pending_raid_disks.next, |
4893 | mdk_rdev_t, same_set); | |
4894 | ||
4895 | printk(KERN_INFO "md: considering %s ...\n", | |
4896 | bdevname(rdev0->bdev,b)); | |
4897 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 4898 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
4899 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
4900 | printk(KERN_INFO "md: adding %s ...\n", | |
4901 | bdevname(rdev->bdev,b)); | |
4902 | list_move(&rdev->same_set, &candidates); | |
4903 | } | |
4904 | /* | |
4905 | * now we have a set of devices, with all of them having | |
4906 | * mostly sane superblocks. It's time to allocate the | |
4907 | * mddev. | |
4908 | */ | |
e8703fe1 N |
4909 | if (part) { |
4910 | dev = MKDEV(mdp_major, | |
4911 | rdev0->preferred_minor << MdpMinorShift); | |
4912 | unit = MINOR(dev) >> MdpMinorShift; | |
4913 | } else { | |
4914 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
4915 | unit = MINOR(dev); | |
4916 | } | |
4917 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
4918 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
4919 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
4920 | break; | |
4921 | } | |
1da177e4 LT |
4922 | |
4923 | md_probe(dev, NULL, NULL); | |
4924 | mddev = mddev_find(dev); | |
9bbbca3a NB |
4925 | if (!mddev || !mddev->gendisk) { |
4926 | if (mddev) | |
4927 | mddev_put(mddev); | |
4928 | printk(KERN_ERR | |
1da177e4 LT |
4929 | "md: cannot allocate memory for md drive.\n"); |
4930 | break; | |
4931 | } | |
4932 | if (mddev_lock(mddev)) | |
4933 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
4934 | mdname(mddev)); | |
4935 | else if (mddev->raid_disks || mddev->major_version | |
4936 | || !list_empty(&mddev->disks)) { | |
4937 | printk(KERN_WARNING | |
4938 | "md: %s already running, cannot run %s\n", | |
4939 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
4940 | mddev_unlock(mddev); | |
4941 | } else { | |
4942 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 4943 | mddev->persistent = 1; |
159ec1fc | 4944 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
4945 | list_del_init(&rdev->same_set); |
4946 | if (bind_rdev_to_array(rdev, mddev)) | |
4947 | export_rdev(rdev); | |
4948 | } | |
4949 | autorun_array(mddev); | |
4950 | mddev_unlock(mddev); | |
4951 | } | |
4952 | /* on success, candidates will be empty, on error | |
4953 | * it won't... | |
4954 | */ | |
159ec1fc | 4955 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 4956 | list_del_init(&rdev->same_set); |
1da177e4 | 4957 | export_rdev(rdev); |
4b80991c | 4958 | } |
1da177e4 LT |
4959 | mddev_put(mddev); |
4960 | } | |
4961 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
4962 | } | |
fdee8ae4 | 4963 | #endif /* !MODULE */ |
1da177e4 | 4964 | |
1da177e4 LT |
4965 | static int get_version(void __user * arg) |
4966 | { | |
4967 | mdu_version_t ver; | |
4968 | ||
4969 | ver.major = MD_MAJOR_VERSION; | |
4970 | ver.minor = MD_MINOR_VERSION; | |
4971 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
4972 | ||
4973 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
4974 | return -EFAULT; | |
4975 | ||
4976 | return 0; | |
4977 | } | |
4978 | ||
4979 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
4980 | { | |
4981 | mdu_array_info_t info; | |
a9f326eb | 4982 | int nr,working,insync,failed,spare; |
1da177e4 | 4983 | mdk_rdev_t *rdev; |
1da177e4 | 4984 | |
a9f326eb | 4985 | nr=working=insync=failed=spare=0; |
159ec1fc | 4986 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 4987 | nr++; |
b2d444d7 | 4988 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4989 | failed++; |
4990 | else { | |
4991 | working++; | |
b2d444d7 | 4992 | if (test_bit(In_sync, &rdev->flags)) |
a9f326eb | 4993 | insync++; |
1da177e4 LT |
4994 | else |
4995 | spare++; | |
4996 | } | |
4997 | } | |
4998 | ||
4999 | info.major_version = mddev->major_version; | |
5000 | info.minor_version = mddev->minor_version; | |
5001 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
5002 | info.ctime = mddev->ctime; | |
5003 | info.level = mddev->level; | |
58c0fed4 AN |
5004 | info.size = mddev->dev_sectors / 2; |
5005 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 5006 | info.size = -1; |
1da177e4 LT |
5007 | info.nr_disks = nr; |
5008 | info.raid_disks = mddev->raid_disks; | |
5009 | info.md_minor = mddev->md_minor; | |
5010 | info.not_persistent= !mddev->persistent; | |
5011 | ||
5012 | info.utime = mddev->utime; | |
5013 | info.state = 0; | |
5014 | if (mddev->in_sync) | |
5015 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5016 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5017 | info.state = (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 5018 | info.active_disks = insync; |
1da177e4 LT |
5019 | info.working_disks = working; |
5020 | info.failed_disks = failed; | |
5021 | info.spare_disks = spare; | |
5022 | ||
5023 | info.layout = mddev->layout; | |
9d8f0363 | 5024 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5025 | |
5026 | if (copy_to_user(arg, &info, sizeof(info))) | |
5027 | return -EFAULT; | |
5028 | ||
5029 | return 0; | |
5030 | } | |
5031 | ||
87162a28 | 5032 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
5033 | { |
5034 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
5035 | char *ptr, *buf = NULL; | |
5036 | int err = -ENOMEM; | |
5037 | ||
b5470dc5 DW |
5038 | if (md_allow_write(mddev)) |
5039 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
5040 | else | |
5041 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 5042 | |
32a7627c N |
5043 | if (!file) |
5044 | goto out; | |
5045 | ||
5046 | /* bitmap disabled, zero the first byte and copy out */ | |
5047 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
5048 | file->pathname[0] = '\0'; | |
5049 | goto copy_out; | |
5050 | } | |
5051 | ||
5052 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
5053 | if (!buf) | |
5054 | goto out; | |
5055 | ||
6bcfd601 CH |
5056 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
5057 | if (IS_ERR(ptr)) | |
32a7627c N |
5058 | goto out; |
5059 | ||
5060 | strcpy(file->pathname, ptr); | |
5061 | ||
5062 | copy_out: | |
5063 | err = 0; | |
5064 | if (copy_to_user(arg, file, sizeof(*file))) | |
5065 | err = -EFAULT; | |
5066 | out: | |
5067 | kfree(buf); | |
5068 | kfree(file); | |
5069 | return err; | |
5070 | } | |
5071 | ||
1da177e4 LT |
5072 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
5073 | { | |
5074 | mdu_disk_info_t info; | |
1da177e4 LT |
5075 | mdk_rdev_t *rdev; |
5076 | ||
5077 | if (copy_from_user(&info, arg, sizeof(info))) | |
5078 | return -EFAULT; | |
5079 | ||
26ef379f | 5080 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
5081 | if (rdev) { |
5082 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5083 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5084 | info.raid_disk = rdev->raid_disk; | |
5085 | info.state = 0; | |
b2d444d7 | 5086 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5087 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5088 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5089 | info.state |= (1<<MD_DISK_ACTIVE); |
5090 | info.state |= (1<<MD_DISK_SYNC); | |
5091 | } | |
8ddf9efe N |
5092 | if (test_bit(WriteMostly, &rdev->flags)) |
5093 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5094 | } else { |
5095 | info.major = info.minor = 0; | |
5096 | info.raid_disk = -1; | |
5097 | info.state = (1<<MD_DISK_REMOVED); | |
5098 | } | |
5099 | ||
5100 | if (copy_to_user(arg, &info, sizeof(info))) | |
5101 | return -EFAULT; | |
5102 | ||
5103 | return 0; | |
5104 | } | |
5105 | ||
5106 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
5107 | { | |
5108 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
5109 | mdk_rdev_t *rdev; | |
5110 | dev_t dev = MKDEV(info->major,info->minor); | |
5111 | ||
5112 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
5113 | return -EOVERFLOW; | |
5114 | ||
5115 | if (!mddev->raid_disks) { | |
5116 | int err; | |
5117 | /* expecting a device which has a superblock */ | |
5118 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5119 | if (IS_ERR(rdev)) { | |
5120 | printk(KERN_WARNING | |
5121 | "md: md_import_device returned %ld\n", | |
5122 | PTR_ERR(rdev)); | |
5123 | return PTR_ERR(rdev); | |
5124 | } | |
5125 | if (!list_empty(&mddev->disks)) { | |
5126 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
5127 | mdk_rdev_t, same_set); | |
a9f326eb | 5128 | err = super_types[mddev->major_version] |
1da177e4 LT |
5129 | .load_super(rdev, rdev0, mddev->minor_version); |
5130 | if (err < 0) { | |
5131 | printk(KERN_WARNING | |
5132 | "md: %s has different UUID to %s\n", | |
5133 | bdevname(rdev->bdev,b), | |
5134 | bdevname(rdev0->bdev,b2)); | |
5135 | export_rdev(rdev); | |
5136 | return -EINVAL; | |
5137 | } | |
5138 | } | |
5139 | err = bind_rdev_to_array(rdev, mddev); | |
5140 | if (err) | |
5141 | export_rdev(rdev); | |
5142 | return err; | |
5143 | } | |
5144 | ||
5145 | /* | |
5146 | * add_new_disk can be used once the array is assembled | |
5147 | * to add "hot spares". They must already have a superblock | |
5148 | * written | |
5149 | */ | |
5150 | if (mddev->pers) { | |
5151 | int err; | |
5152 | if (!mddev->pers->hot_add_disk) { | |
5153 | printk(KERN_WARNING | |
5154 | "%s: personality does not support diskops!\n", | |
5155 | mdname(mddev)); | |
5156 | return -EINVAL; | |
5157 | } | |
7b1e35f6 N |
5158 | if (mddev->persistent) |
5159 | rdev = md_import_device(dev, mddev->major_version, | |
5160 | mddev->minor_version); | |
5161 | else | |
5162 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
5163 | if (IS_ERR(rdev)) { |
5164 | printk(KERN_WARNING | |
5165 | "md: md_import_device returned %ld\n", | |
5166 | PTR_ERR(rdev)); | |
5167 | return PTR_ERR(rdev); | |
5168 | } | |
1a855a06 | 5169 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
5170 | if (!mddev->persistent) { |
5171 | if (info->state & (1<<MD_DISK_SYNC) && | |
bf572541 | 5172 | info->raid_disk < mddev->raid_disks) { |
41158c7e | 5173 | rdev->raid_disk = info->raid_disk; |
bf572541 N |
5174 | set_bit(In_sync, &rdev->flags); |
5175 | } else | |
41158c7e N |
5176 | rdev->raid_disk = -1; |
5177 | } else | |
5178 | super_types[mddev->major_version]. | |
5179 | validate_super(mddev, rdev); | |
1a855a06 N |
5180 | if (test_bit(In_sync, &rdev->flags)) |
5181 | rdev->saved_raid_disk = rdev->raid_disk; | |
5182 | else | |
5183 | rdev->saved_raid_disk = -1; | |
41158c7e | 5184 | |
b2d444d7 | 5185 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5186 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5187 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5188 | else |
5189 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5190 | |
1da177e4 LT |
5191 | rdev->raid_disk = -1; |
5192 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
5193 | if (!err && !mddev->pers->hot_remove_disk) { |
5194 | /* If there is hot_add_disk but no hot_remove_disk | |
5195 | * then added disks for geometry changes, | |
5196 | * and should be added immediately. | |
5197 | */ | |
5198 | super_types[mddev->major_version]. | |
5199 | validate_super(mddev, rdev); | |
5200 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
5201 | if (err) | |
5202 | unbind_rdev_from_array(rdev); | |
5203 | } | |
1da177e4 LT |
5204 | if (err) |
5205 | export_rdev(rdev); | |
52664732 | 5206 | else |
00bcb4ac | 5207 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c361777f | 5208 | |
17571284 | 5209 | md_update_sb(mddev, 1); |
72a23c21 NB |
5210 | if (mddev->degraded) |
5211 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 5212 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 5213 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
5214 | return err; |
5215 | } | |
5216 | ||
5217 | /* otherwise, add_new_disk is only allowed | |
5218 | * for major_version==0 superblocks | |
5219 | */ | |
5220 | if (mddev->major_version != 0) { | |
5221 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5222 | mdname(mddev)); | |
5223 | return -EINVAL; | |
5224 | } | |
5225 | ||
5226 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5227 | int err; | |
d710e138 | 5228 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5229 | if (IS_ERR(rdev)) { |
5230 | printk(KERN_WARNING | |
5231 | "md: error, md_import_device() returned %ld\n", | |
5232 | PTR_ERR(rdev)); | |
5233 | return PTR_ERR(rdev); | |
5234 | } | |
5235 | rdev->desc_nr = info->number; | |
5236 | if (info->raid_disk < mddev->raid_disks) | |
5237 | rdev->raid_disk = info->raid_disk; | |
5238 | else | |
5239 | rdev->raid_disk = -1; | |
5240 | ||
1da177e4 | 5241 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5242 | if (info->state & (1<<MD_DISK_SYNC)) |
5243 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5244 | |
8ddf9efe N |
5245 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5246 | set_bit(WriteMostly, &rdev->flags); | |
5247 | ||
1da177e4 LT |
5248 | if (!mddev->persistent) { |
5249 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
77304d2a MS |
5250 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
5251 | } else | |
0f420358 | 5252 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
8190e754 | 5253 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5254 | |
2bf071bf N |
5255 | err = bind_rdev_to_array(rdev, mddev); |
5256 | if (err) { | |
5257 | export_rdev(rdev); | |
5258 | return err; | |
5259 | } | |
1da177e4 LT |
5260 | } |
5261 | ||
5262 | return 0; | |
5263 | } | |
5264 | ||
5265 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
5266 | { | |
5267 | char b[BDEVNAME_SIZE]; | |
5268 | mdk_rdev_t *rdev; | |
5269 | ||
1da177e4 LT |
5270 | rdev = find_rdev(mddev, dev); |
5271 | if (!rdev) | |
5272 | return -ENXIO; | |
5273 | ||
5274 | if (rdev->raid_disk >= 0) | |
5275 | goto busy; | |
5276 | ||
5277 | kick_rdev_from_array(rdev); | |
850b2b42 | 5278 | md_update_sb(mddev, 1); |
d7603b7e | 5279 | md_new_event(mddev); |
1da177e4 LT |
5280 | |
5281 | return 0; | |
5282 | busy: | |
fdefa4d8 | 5283 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5284 | bdevname(rdev->bdev,b), mdname(mddev)); |
5285 | return -EBUSY; | |
5286 | } | |
5287 | ||
5288 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
5289 | { | |
5290 | char b[BDEVNAME_SIZE]; | |
5291 | int err; | |
1da177e4 LT |
5292 | mdk_rdev_t *rdev; |
5293 | ||
5294 | if (!mddev->pers) | |
5295 | return -ENODEV; | |
5296 | ||
5297 | if (mddev->major_version != 0) { | |
5298 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5299 | " version-0 superblocks.\n", | |
5300 | mdname(mddev)); | |
5301 | return -EINVAL; | |
5302 | } | |
5303 | if (!mddev->pers->hot_add_disk) { | |
5304 | printk(KERN_WARNING | |
5305 | "%s: personality does not support diskops!\n", | |
5306 | mdname(mddev)); | |
5307 | return -EINVAL; | |
5308 | } | |
5309 | ||
d710e138 | 5310 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5311 | if (IS_ERR(rdev)) { |
5312 | printk(KERN_WARNING | |
5313 | "md: error, md_import_device() returned %ld\n", | |
5314 | PTR_ERR(rdev)); | |
5315 | return -EINVAL; | |
5316 | } | |
5317 | ||
5318 | if (mddev->persistent) | |
0f420358 | 5319 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 5320 | else |
77304d2a | 5321 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 5322 | |
8190e754 | 5323 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5324 | |
b2d444d7 | 5325 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5326 | printk(KERN_WARNING |
5327 | "md: can not hot-add faulty %s disk to %s!\n", | |
5328 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5329 | err = -EINVAL; | |
5330 | goto abort_export; | |
5331 | } | |
b2d444d7 | 5332 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5333 | rdev->desc_nr = -1; |
5842730d | 5334 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5335 | err = bind_rdev_to_array(rdev, mddev); |
5336 | if (err) | |
5337 | goto abort_export; | |
1da177e4 LT |
5338 | |
5339 | /* | |
5340 | * The rest should better be atomic, we can have disk failures | |
5341 | * noticed in interrupt contexts ... | |
5342 | */ | |
5343 | ||
1da177e4 LT |
5344 | rdev->raid_disk = -1; |
5345 | ||
850b2b42 | 5346 | md_update_sb(mddev, 1); |
1da177e4 LT |
5347 | |
5348 | /* | |
5349 | * Kick recovery, maybe this spare has to be added to the | |
5350 | * array immediately. | |
5351 | */ | |
5352 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5353 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5354 | md_new_event(mddev); |
1da177e4 LT |
5355 | return 0; |
5356 | ||
1da177e4 LT |
5357 | abort_export: |
5358 | export_rdev(rdev); | |
5359 | return err; | |
5360 | } | |
5361 | ||
32a7627c N |
5362 | static int set_bitmap_file(mddev_t *mddev, int fd) |
5363 | { | |
5364 | int err; | |
5365 | ||
36fa3063 N |
5366 | if (mddev->pers) { |
5367 | if (!mddev->pers->quiesce) | |
5368 | return -EBUSY; | |
5369 | if (mddev->recovery || mddev->sync_thread) | |
5370 | return -EBUSY; | |
5371 | /* we should be able to change the bitmap.. */ | |
5372 | } | |
32a7627c | 5373 | |
32a7627c | 5374 | |
36fa3063 N |
5375 | if (fd >= 0) { |
5376 | if (mddev->bitmap) | |
5377 | return -EEXIST; /* cannot add when bitmap is present */ | |
c3d9714e | 5378 | mddev->bitmap_info.file = fget(fd); |
32a7627c | 5379 | |
c3d9714e | 5380 | if (mddev->bitmap_info.file == NULL) { |
36fa3063 N |
5381 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
5382 | mdname(mddev)); | |
5383 | return -EBADF; | |
5384 | } | |
5385 | ||
c3d9714e | 5386 | err = deny_bitmap_write_access(mddev->bitmap_info.file); |
36fa3063 N |
5387 | if (err) { |
5388 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
5389 | mdname(mddev)); | |
c3d9714e N |
5390 | fput(mddev->bitmap_info.file); |
5391 | mddev->bitmap_info.file = NULL; | |
36fa3063 N |
5392 | return err; |
5393 | } | |
c3d9714e | 5394 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
5395 | } else if (mddev->bitmap == NULL) |
5396 | return -ENOENT; /* cannot remove what isn't there */ | |
5397 | err = 0; | |
5398 | if (mddev->pers) { | |
5399 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 5400 | if (fd >= 0) { |
36fa3063 | 5401 | err = bitmap_create(mddev); |
69e51b44 N |
5402 | if (!err) |
5403 | err = bitmap_load(mddev); | |
5404 | } | |
d7375ab3 | 5405 | if (fd < 0 || err) { |
36fa3063 | 5406 | bitmap_destroy(mddev); |
d7375ab3 N |
5407 | fd = -1; /* make sure to put the file */ |
5408 | } | |
36fa3063 | 5409 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
5410 | } |
5411 | if (fd < 0) { | |
c3d9714e N |
5412 | if (mddev->bitmap_info.file) { |
5413 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
5414 | fput(mddev->bitmap_info.file); | |
acc55e22 | 5415 | } |
c3d9714e | 5416 | mddev->bitmap_info.file = NULL; |
36fa3063 N |
5417 | } |
5418 | ||
32a7627c N |
5419 | return err; |
5420 | } | |
5421 | ||
1da177e4 LT |
5422 | /* |
5423 | * set_array_info is used two different ways | |
5424 | * The original usage is when creating a new array. | |
5425 | * In this usage, raid_disks is > 0 and it together with | |
5426 | * level, size, not_persistent,layout,chunksize determine the | |
5427 | * shape of the array. | |
5428 | * This will always create an array with a type-0.90.0 superblock. | |
5429 | * The newer usage is when assembling an array. | |
5430 | * In this case raid_disks will be 0, and the major_version field is | |
5431 | * use to determine which style super-blocks are to be found on the devices. | |
5432 | * The minor and patch _version numbers are also kept incase the | |
5433 | * super_block handler wishes to interpret them. | |
5434 | */ | |
5435 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
5436 | { | |
5437 | ||
5438 | if (info->raid_disks == 0) { | |
5439 | /* just setting version number for superblock loading */ | |
5440 | if (info->major_version < 0 || | |
50511da3 | 5441 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
5442 | super_types[info->major_version].name == NULL) { |
5443 | /* maybe try to auto-load a module? */ | |
5444 | printk(KERN_INFO | |
5445 | "md: superblock version %d not known\n", | |
5446 | info->major_version); | |
5447 | return -EINVAL; | |
5448 | } | |
5449 | mddev->major_version = info->major_version; | |
5450 | mddev->minor_version = info->minor_version; | |
5451 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 5452 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
5453 | /* ensure mddev_put doesn't delete this now that there |
5454 | * is some minimal configuration. | |
5455 | */ | |
5456 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
5457 | return 0; |
5458 | } | |
5459 | mddev->major_version = MD_MAJOR_VERSION; | |
5460 | mddev->minor_version = MD_MINOR_VERSION; | |
5461 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
5462 | mddev->ctime = get_seconds(); | |
5463 | ||
5464 | mddev->level = info->level; | |
17115e03 | 5465 | mddev->clevel[0] = 0; |
58c0fed4 | 5466 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
5467 | mddev->raid_disks = info->raid_disks; |
5468 | /* don't set md_minor, it is determined by which /dev/md* was | |
5469 | * openned | |
5470 | */ | |
5471 | if (info->state & (1<<MD_SB_CLEAN)) | |
5472 | mddev->recovery_cp = MaxSector; | |
5473 | else | |
5474 | mddev->recovery_cp = 0; | |
5475 | mddev->persistent = ! info->not_persistent; | |
e691063a | 5476 | mddev->external = 0; |
1da177e4 LT |
5477 | |
5478 | mddev->layout = info->layout; | |
9d8f0363 | 5479 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
5480 | |
5481 | mddev->max_disks = MD_SB_DISKS; | |
5482 | ||
e691063a N |
5483 | if (mddev->persistent) |
5484 | mddev->flags = 0; | |
850b2b42 | 5485 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5486 | |
c3d9714e N |
5487 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
5488 | mddev->bitmap_info.offset = 0; | |
b2a2703c | 5489 | |
f6705578 N |
5490 | mddev->reshape_position = MaxSector; |
5491 | ||
1da177e4 LT |
5492 | /* |
5493 | * Generate a 128 bit UUID | |
5494 | */ | |
5495 | get_random_bytes(mddev->uuid, 16); | |
5496 | ||
f6705578 | 5497 | mddev->new_level = mddev->level; |
664e7c41 | 5498 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
5499 | mddev->new_layout = mddev->layout; |
5500 | mddev->delta_disks = 0; | |
5501 | ||
1da177e4 LT |
5502 | return 0; |
5503 | } | |
5504 | ||
1f403624 DW |
5505 | void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors) |
5506 | { | |
b522adcd DW |
5507 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
5508 | ||
5509 | if (mddev->external_size) | |
5510 | return; | |
5511 | ||
1f403624 DW |
5512 | mddev->array_sectors = array_sectors; |
5513 | } | |
5514 | EXPORT_SYMBOL(md_set_array_sectors); | |
5515 | ||
d71f9f88 | 5516 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
a35b0d69 | 5517 | { |
159ec1fc | 5518 | mdk_rdev_t *rdev; |
a35b0d69 | 5519 | int rv; |
d71f9f88 | 5520 | int fit = (num_sectors == 0); |
a35b0d69 N |
5521 | |
5522 | if (mddev->pers->resize == NULL) | |
5523 | return -EINVAL; | |
d71f9f88 AN |
5524 | /* The "num_sectors" is the number of sectors of each device that |
5525 | * is used. This can only make sense for arrays with redundancy. | |
5526 | * linear and raid0 always use whatever space is available. We can only | |
5527 | * consider changing this number if no resync or reconstruction is | |
5528 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 5529 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
5530 | * of each device. If num_sectors is zero, we find the largest size |
5531 | * that fits. | |
5532 | ||
a35b0d69 N |
5533 | */ |
5534 | if (mddev->sync_thread) | |
5535 | return -EBUSY; | |
dba034ee N |
5536 | if (mddev->bitmap) |
5537 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
5538 | * grow, and re-add. | |
5539 | */ | |
5540 | return -EBUSY; | |
159ec1fc | 5541 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dd8ac336 | 5542 | sector_t avail = rdev->sectors; |
01ab5662 | 5543 | |
d71f9f88 AN |
5544 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
5545 | num_sectors = avail; | |
5546 | if (avail < num_sectors) | |
a35b0d69 N |
5547 | return -ENOSPC; |
5548 | } | |
d71f9f88 | 5549 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
5550 | if (!rv) |
5551 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
5552 | return rv; |
5553 | } | |
5554 | ||
da943b99 N |
5555 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
5556 | { | |
5557 | int rv; | |
5558 | /* change the number of raid disks */ | |
63c70c4f | 5559 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
5560 | return -EINVAL; |
5561 | if (raid_disks <= 0 || | |
233fca36 | 5562 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 5563 | return -EINVAL; |
63c70c4f | 5564 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 5565 | return -EBUSY; |
63c70c4f N |
5566 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
5567 | ||
5568 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
5569 | return rv; |
5570 | } | |
5571 | ||
5572 | ||
1da177e4 LT |
5573 | /* |
5574 | * update_array_info is used to change the configuration of an | |
5575 | * on-line array. | |
5576 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
5577 | * fields in the info are checked against the array. | |
5578 | * Any differences that cannot be handled will cause an error. | |
5579 | * Normally, only one change can be managed at a time. | |
5580 | */ | |
5581 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
5582 | { | |
5583 | int rv = 0; | |
5584 | int cnt = 0; | |
36fa3063 N |
5585 | int state = 0; |
5586 | ||
5587 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 5588 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5589 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
5590 | |
5591 | if (mddev->major_version != info->major_version || | |
5592 | mddev->minor_version != info->minor_version || | |
5593 | /* mddev->patch_version != info->patch_version || */ | |
5594 | mddev->ctime != info->ctime || | |
5595 | mddev->level != info->level || | |
5596 | /* mddev->layout != info->layout || */ | |
5597 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 5598 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
5599 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
5600 | ((state^info->state) & 0xfffffe00) | |
5601 | ) | |
1da177e4 LT |
5602 | return -EINVAL; |
5603 | /* Check there is only one change */ | |
58c0fed4 AN |
5604 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
5605 | cnt++; | |
5606 | if (mddev->raid_disks != info->raid_disks) | |
5607 | cnt++; | |
5608 | if (mddev->layout != info->layout) | |
5609 | cnt++; | |
5610 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
5611 | cnt++; | |
5612 | if (cnt == 0) | |
5613 | return 0; | |
5614 | if (cnt > 1) | |
5615 | return -EINVAL; | |
1da177e4 LT |
5616 | |
5617 | if (mddev->layout != info->layout) { | |
5618 | /* Change layout | |
5619 | * we don't need to do anything at the md level, the | |
5620 | * personality will take care of it all. | |
5621 | */ | |
50ac168a | 5622 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 5623 | return -EINVAL; |
597a711b N |
5624 | else { |
5625 | mddev->new_layout = info->layout; | |
50ac168a | 5626 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
5627 | if (rv) |
5628 | mddev->new_layout = mddev->layout; | |
5629 | return rv; | |
5630 | } | |
1da177e4 | 5631 | } |
58c0fed4 | 5632 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 5633 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 5634 | |
da943b99 N |
5635 | if (mddev->raid_disks != info->raid_disks) |
5636 | rv = update_raid_disks(mddev, info->raid_disks); | |
5637 | ||
36fa3063 N |
5638 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
5639 | if (mddev->pers->quiesce == NULL) | |
5640 | return -EINVAL; | |
5641 | if (mddev->recovery || mddev->sync_thread) | |
5642 | return -EBUSY; | |
5643 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
5644 | /* add the bitmap */ | |
5645 | if (mddev->bitmap) | |
5646 | return -EEXIST; | |
c3d9714e | 5647 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 5648 | return -EINVAL; |
c3d9714e N |
5649 | mddev->bitmap_info.offset = |
5650 | mddev->bitmap_info.default_offset; | |
36fa3063 N |
5651 | mddev->pers->quiesce(mddev, 1); |
5652 | rv = bitmap_create(mddev); | |
69e51b44 N |
5653 | if (!rv) |
5654 | rv = bitmap_load(mddev); | |
36fa3063 N |
5655 | if (rv) |
5656 | bitmap_destroy(mddev); | |
5657 | mddev->pers->quiesce(mddev, 0); | |
5658 | } else { | |
5659 | /* remove the bitmap */ | |
5660 | if (!mddev->bitmap) | |
5661 | return -ENOENT; | |
5662 | if (mddev->bitmap->file) | |
5663 | return -EINVAL; | |
5664 | mddev->pers->quiesce(mddev, 1); | |
5665 | bitmap_destroy(mddev); | |
5666 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 5667 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
5668 | } |
5669 | } | |
850b2b42 | 5670 | md_update_sb(mddev, 1); |
1da177e4 LT |
5671 | return rv; |
5672 | } | |
5673 | ||
5674 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
5675 | { | |
5676 | mdk_rdev_t *rdev; | |
5677 | ||
5678 | if (mddev->pers == NULL) | |
5679 | return -ENODEV; | |
5680 | ||
5681 | rdev = find_rdev(mddev, dev); | |
5682 | if (!rdev) | |
5683 | return -ENODEV; | |
5684 | ||
5685 | md_error(mddev, rdev); | |
5686 | return 0; | |
5687 | } | |
5688 | ||
2f9618ce AN |
5689 | /* |
5690 | * We have a problem here : there is no easy way to give a CHS | |
5691 | * virtual geometry. We currently pretend that we have a 2 heads | |
5692 | * 4 sectors (with a BIG number of cylinders...). This drives | |
5693 | * dosfs just mad... ;-) | |
5694 | */ | |
a885c8c4 CH |
5695 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
5696 | { | |
5697 | mddev_t *mddev = bdev->bd_disk->private_data; | |
5698 | ||
5699 | geo->heads = 2; | |
5700 | geo->sectors = 4; | |
49ce6cea | 5701 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
5702 | return 0; |
5703 | } | |
5704 | ||
a39907fa | 5705 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
5706 | unsigned int cmd, unsigned long arg) |
5707 | { | |
5708 | int err = 0; | |
5709 | void __user *argp = (void __user *)arg; | |
1da177e4 | 5710 | mddev_t *mddev = NULL; |
e2218350 | 5711 | int ro; |
1da177e4 LT |
5712 | |
5713 | if (!capable(CAP_SYS_ADMIN)) | |
5714 | return -EACCES; | |
5715 | ||
5716 | /* | |
5717 | * Commands dealing with the RAID driver but not any | |
5718 | * particular array: | |
5719 | */ | |
5720 | switch (cmd) | |
5721 | { | |
5722 | case RAID_VERSION: | |
5723 | err = get_version(argp); | |
5724 | goto done; | |
5725 | ||
5726 | case PRINT_RAID_DEBUG: | |
5727 | err = 0; | |
5728 | md_print_devices(); | |
5729 | goto done; | |
5730 | ||
5731 | #ifndef MODULE | |
5732 | case RAID_AUTORUN: | |
5733 | err = 0; | |
5734 | autostart_arrays(arg); | |
5735 | goto done; | |
5736 | #endif | |
5737 | default:; | |
5738 | } | |
5739 | ||
5740 | /* | |
5741 | * Commands creating/starting a new array: | |
5742 | */ | |
5743 | ||
a39907fa | 5744 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
5745 | |
5746 | if (!mddev) { | |
5747 | BUG(); | |
5748 | goto abort; | |
5749 | } | |
5750 | ||
1da177e4 LT |
5751 | err = mddev_lock(mddev); |
5752 | if (err) { | |
5753 | printk(KERN_INFO | |
5754 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
5755 | err, cmd); | |
5756 | goto abort; | |
5757 | } | |
5758 | ||
5759 | switch (cmd) | |
5760 | { | |
5761 | case SET_ARRAY_INFO: | |
5762 | { | |
5763 | mdu_array_info_t info; | |
5764 | if (!arg) | |
5765 | memset(&info, 0, sizeof(info)); | |
5766 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
5767 | err = -EFAULT; | |
5768 | goto abort_unlock; | |
5769 | } | |
5770 | if (mddev->pers) { | |
5771 | err = update_array_info(mddev, &info); | |
5772 | if (err) { | |
5773 | printk(KERN_WARNING "md: couldn't update" | |
5774 | " array info. %d\n", err); | |
5775 | goto abort_unlock; | |
5776 | } | |
5777 | goto done_unlock; | |
5778 | } | |
5779 | if (!list_empty(&mddev->disks)) { | |
5780 | printk(KERN_WARNING | |
5781 | "md: array %s already has disks!\n", | |
5782 | mdname(mddev)); | |
5783 | err = -EBUSY; | |
5784 | goto abort_unlock; | |
5785 | } | |
5786 | if (mddev->raid_disks) { | |
5787 | printk(KERN_WARNING | |
5788 | "md: array %s already initialised!\n", | |
5789 | mdname(mddev)); | |
5790 | err = -EBUSY; | |
5791 | goto abort_unlock; | |
5792 | } | |
5793 | err = set_array_info(mddev, &info); | |
5794 | if (err) { | |
5795 | printk(KERN_WARNING "md: couldn't set" | |
5796 | " array info. %d\n", err); | |
5797 | goto abort_unlock; | |
5798 | } | |
5799 | } | |
5800 | goto done_unlock; | |
5801 | ||
5802 | default:; | |
5803 | } | |
5804 | ||
5805 | /* | |
5806 | * Commands querying/configuring an existing array: | |
5807 | */ | |
32a7627c | 5808 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 5809 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
5810 | if ((!mddev->raid_disks && !mddev->external) |
5811 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
5812 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
5813 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
5814 | err = -ENODEV; |
5815 | goto abort_unlock; | |
5816 | } | |
5817 | ||
5818 | /* | |
5819 | * Commands even a read-only array can execute: | |
5820 | */ | |
5821 | switch (cmd) | |
5822 | { | |
5823 | case GET_ARRAY_INFO: | |
5824 | err = get_array_info(mddev, argp); | |
5825 | goto done_unlock; | |
5826 | ||
32a7627c | 5827 | case GET_BITMAP_FILE: |
87162a28 | 5828 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
5829 | goto done_unlock; |
5830 | ||
1da177e4 LT |
5831 | case GET_DISK_INFO: |
5832 | err = get_disk_info(mddev, argp); | |
5833 | goto done_unlock; | |
5834 | ||
5835 | case RESTART_ARRAY_RW: | |
5836 | err = restart_array(mddev); | |
5837 | goto done_unlock; | |
5838 | ||
5839 | case STOP_ARRAY: | |
d710e138 | 5840 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
5841 | goto done_unlock; |
5842 | ||
5843 | case STOP_ARRAY_RO: | |
a4bd82d0 | 5844 | err = md_set_readonly(mddev, 1); |
1da177e4 LT |
5845 | goto done_unlock; |
5846 | ||
e2218350 DW |
5847 | case BLKROSET: |
5848 | if (get_user(ro, (int __user *)(arg))) { | |
5849 | err = -EFAULT; | |
5850 | goto done_unlock; | |
5851 | } | |
5852 | err = -EINVAL; | |
5853 | ||
5854 | /* if the bdev is going readonly the value of mddev->ro | |
5855 | * does not matter, no writes are coming | |
5856 | */ | |
5857 | if (ro) | |
5858 | goto done_unlock; | |
5859 | ||
5860 | /* are we are already prepared for writes? */ | |
5861 | if (mddev->ro != 1) | |
5862 | goto done_unlock; | |
5863 | ||
5864 | /* transitioning to readauto need only happen for | |
5865 | * arrays that call md_write_start | |
5866 | */ | |
5867 | if (mddev->pers) { | |
5868 | err = restart_array(mddev); | |
5869 | if (err == 0) { | |
5870 | mddev->ro = 2; | |
5871 | set_disk_ro(mddev->gendisk, 0); | |
5872 | } | |
5873 | } | |
5874 | goto done_unlock; | |
1da177e4 LT |
5875 | } |
5876 | ||
5877 | /* | |
5878 | * The remaining ioctls are changing the state of the | |
f91de92e N |
5879 | * superblock, so we do not allow them on read-only arrays. |
5880 | * However non-MD ioctls (e.g. get-size) will still come through | |
5881 | * here and hit the 'default' below, so only disallow | |
5882 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 5883 | */ |
bb57fc64 | 5884 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
5885 | if (mddev->ro == 2) { |
5886 | mddev->ro = 0; | |
00bcb4ac | 5887 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 NB |
5888 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5889 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
5890 | } else { |
5891 | err = -EROFS; | |
5892 | goto abort_unlock; | |
5893 | } | |
1da177e4 LT |
5894 | } |
5895 | ||
5896 | switch (cmd) | |
5897 | { | |
5898 | case ADD_NEW_DISK: | |
5899 | { | |
5900 | mdu_disk_info_t info; | |
5901 | if (copy_from_user(&info, argp, sizeof(info))) | |
5902 | err = -EFAULT; | |
5903 | else | |
5904 | err = add_new_disk(mddev, &info); | |
5905 | goto done_unlock; | |
5906 | } | |
5907 | ||
5908 | case HOT_REMOVE_DISK: | |
5909 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
5910 | goto done_unlock; | |
5911 | ||
5912 | case HOT_ADD_DISK: | |
5913 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
5914 | goto done_unlock; | |
5915 | ||
5916 | case SET_DISK_FAULTY: | |
5917 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
5918 | goto done_unlock; | |
5919 | ||
5920 | case RUN_ARRAY: | |
d710e138 | 5921 | err = do_md_run(mddev); |
1da177e4 LT |
5922 | goto done_unlock; |
5923 | ||
32a7627c N |
5924 | case SET_BITMAP_FILE: |
5925 | err = set_bitmap_file(mddev, (int)arg); | |
5926 | goto done_unlock; | |
5927 | ||
1da177e4 | 5928 | default: |
1da177e4 LT |
5929 | err = -EINVAL; |
5930 | goto abort_unlock; | |
5931 | } | |
5932 | ||
5933 | done_unlock: | |
5934 | abort_unlock: | |
d3374825 N |
5935 | if (mddev->hold_active == UNTIL_IOCTL && |
5936 | err != -EINVAL) | |
5937 | mddev->hold_active = 0; | |
1da177e4 LT |
5938 | mddev_unlock(mddev); |
5939 | ||
5940 | return err; | |
5941 | done: | |
5942 | if (err) | |
5943 | MD_BUG(); | |
5944 | abort: | |
5945 | return err; | |
5946 | } | |
aa98aa31 AB |
5947 | #ifdef CONFIG_COMPAT |
5948 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
5949 | unsigned int cmd, unsigned long arg) | |
5950 | { | |
5951 | switch (cmd) { | |
5952 | case HOT_REMOVE_DISK: | |
5953 | case HOT_ADD_DISK: | |
5954 | case SET_DISK_FAULTY: | |
5955 | case SET_BITMAP_FILE: | |
5956 | /* These take in integer arg, do not convert */ | |
5957 | break; | |
5958 | default: | |
5959 | arg = (unsigned long)compat_ptr(arg); | |
5960 | break; | |
5961 | } | |
5962 | ||
5963 | return md_ioctl(bdev, mode, cmd, arg); | |
5964 | } | |
5965 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 5966 | |
a39907fa | 5967 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
5968 | { |
5969 | /* | |
5970 | * Succeed if we can lock the mddev, which confirms that | |
5971 | * it isn't being stopped right now. | |
5972 | */ | |
d3374825 | 5973 | mddev_t *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
5974 | int err; |
5975 | ||
d3374825 N |
5976 | if (mddev->gendisk != bdev->bd_disk) { |
5977 | /* we are racing with mddev_put which is discarding this | |
5978 | * bd_disk. | |
5979 | */ | |
5980 | mddev_put(mddev); | |
5981 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 5982 | flush_workqueue(md_misc_wq); |
d3374825 N |
5983 | /* Then retry the open from the top */ |
5984 | return -ERESTARTSYS; | |
5985 | } | |
5986 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
5987 | ||
c8c00a69 | 5988 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
5989 | goto out; |
5990 | ||
5991 | err = 0; | |
f2ea68cf | 5992 | atomic_inc(&mddev->openers); |
c8c00a69 | 5993 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 5994 | |
f3b99be1 | 5995 | check_disk_size_change(mddev->gendisk, bdev); |
1da177e4 LT |
5996 | out: |
5997 | return err; | |
5998 | } | |
5999 | ||
a39907fa | 6000 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 6001 | { |
a39907fa | 6002 | mddev_t *mddev = disk->private_data; |
1da177e4 | 6003 | |
52e5f9d1 | 6004 | BUG_ON(!mddev); |
f2ea68cf | 6005 | atomic_dec(&mddev->openers); |
1da177e4 LT |
6006 | mddev_put(mddev); |
6007 | ||
6008 | return 0; | |
6009 | } | |
83d5cde4 | 6010 | static const struct block_device_operations md_fops = |
1da177e4 LT |
6011 | { |
6012 | .owner = THIS_MODULE, | |
a39907fa AV |
6013 | .open = md_open, |
6014 | .release = md_release, | |
b492b852 | 6015 | .ioctl = md_ioctl, |
aa98aa31 AB |
6016 | #ifdef CONFIG_COMPAT |
6017 | .compat_ioctl = md_compat_ioctl, | |
6018 | #endif | |
a885c8c4 | 6019 | .getgeo = md_getgeo, |
1da177e4 LT |
6020 | }; |
6021 | ||
75c96f85 | 6022 | static int md_thread(void * arg) |
1da177e4 LT |
6023 | { |
6024 | mdk_thread_t *thread = arg; | |
6025 | ||
1da177e4 LT |
6026 | /* |
6027 | * md_thread is a 'system-thread', it's priority should be very | |
6028 | * high. We avoid resource deadlocks individually in each | |
6029 | * raid personality. (RAID5 does preallocation) We also use RR and | |
6030 | * the very same RT priority as kswapd, thus we will never get | |
6031 | * into a priority inversion deadlock. | |
6032 | * | |
6033 | * we definitely have to have equal or higher priority than | |
6034 | * bdflush, otherwise bdflush will deadlock if there are too | |
6035 | * many dirty RAID5 blocks. | |
6036 | */ | |
1da177e4 | 6037 | |
6985c43f | 6038 | allow_signal(SIGKILL); |
a6fb0934 | 6039 | while (!kthread_should_stop()) { |
1da177e4 | 6040 | |
93588e22 N |
6041 | /* We need to wait INTERRUPTIBLE so that |
6042 | * we don't add to the load-average. | |
6043 | * That means we need to be sure no signals are | |
6044 | * pending | |
6045 | */ | |
6046 | if (signal_pending(current)) | |
6047 | flush_signals(current); | |
6048 | ||
6049 | wait_event_interruptible_timeout | |
6050 | (thread->wqueue, | |
6051 | test_bit(THREAD_WAKEUP, &thread->flags) | |
6052 | || kthread_should_stop(), | |
6053 | thread->timeout); | |
1da177e4 | 6054 | |
6c987910 N |
6055 | clear_bit(THREAD_WAKEUP, &thread->flags); |
6056 | if (!kthread_should_stop()) | |
589a594b | 6057 | thread->run(thread->mddev); |
1da177e4 | 6058 | } |
a6fb0934 | 6059 | |
1da177e4 LT |
6060 | return 0; |
6061 | } | |
6062 | ||
6063 | void md_wakeup_thread(mdk_thread_t *thread) | |
6064 | { | |
6065 | if (thread) { | |
6066 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
6067 | set_bit(THREAD_WAKEUP, &thread->flags); | |
6068 | wake_up(&thread->wqueue); | |
6069 | } | |
6070 | } | |
6071 | ||
6072 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
6073 | const char *name) | |
6074 | { | |
6075 | mdk_thread_t *thread; | |
1da177e4 | 6076 | |
9ffae0cf | 6077 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
6078 | if (!thread) |
6079 | return NULL; | |
6080 | ||
1da177e4 LT |
6081 | init_waitqueue_head(&thread->wqueue); |
6082 | ||
1da177e4 LT |
6083 | thread->run = run; |
6084 | thread->mddev = mddev; | |
32a7627c | 6085 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
6086 | thread->tsk = kthread_run(md_thread, thread, |
6087 | "%s_%s", | |
6088 | mdname(thread->mddev), | |
6089 | name ?: mddev->pers->name); | |
a6fb0934 | 6090 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
6091 | kfree(thread); |
6092 | return NULL; | |
6093 | } | |
1da177e4 LT |
6094 | return thread; |
6095 | } | |
6096 | ||
1da177e4 LT |
6097 | void md_unregister_thread(mdk_thread_t *thread) |
6098 | { | |
e0cf8f04 N |
6099 | if (!thread) |
6100 | return; | |
ba25f9dc | 6101 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
6102 | |
6103 | kthread_stop(thread->tsk); | |
1da177e4 LT |
6104 | kfree(thread); |
6105 | } | |
6106 | ||
6107 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
6108 | { | |
6109 | if (!mddev) { | |
6110 | MD_BUG(); | |
6111 | return; | |
6112 | } | |
6113 | ||
b2d444d7 | 6114 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 6115 | return; |
6bfe0b49 DW |
6116 | |
6117 | if (mddev->external) | |
6118 | set_bit(Blocked, &rdev->flags); | |
32a7627c | 6119 | /* |
1da177e4 LT |
6120 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
6121 | mdname(mddev), | |
6122 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
6123 | __builtin_return_address(0),__builtin_return_address(1), | |
6124 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 6125 | */ |
d0a0a5ee AM |
6126 | if (!mddev->pers) |
6127 | return; | |
1da177e4 LT |
6128 | if (!mddev->pers->error_handler) |
6129 | return; | |
6130 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
6131 | if (mddev->degraded) |
6132 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 6133 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
6134 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6135 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6136 | md_wakeup_thread(mddev->thread); | |
768a418d | 6137 | if (mddev->event_work.func) |
e804ac78 | 6138 | queue_work(md_misc_wq, &mddev->event_work); |
c331eb04 | 6139 | md_new_event_inintr(mddev); |
1da177e4 LT |
6140 | } |
6141 | ||
6142 | /* seq_file implementation /proc/mdstat */ | |
6143 | ||
6144 | static void status_unused(struct seq_file *seq) | |
6145 | { | |
6146 | int i = 0; | |
6147 | mdk_rdev_t *rdev; | |
1da177e4 LT |
6148 | |
6149 | seq_printf(seq, "unused devices: "); | |
6150 | ||
159ec1fc | 6151 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
6152 | char b[BDEVNAME_SIZE]; |
6153 | i++; | |
6154 | seq_printf(seq, "%s ", | |
6155 | bdevname(rdev->bdev,b)); | |
6156 | } | |
6157 | if (!i) | |
6158 | seq_printf(seq, "<none>"); | |
6159 | ||
6160 | seq_printf(seq, "\n"); | |
6161 | } | |
6162 | ||
6163 | ||
6164 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
6165 | { | |
dd71cf6b N |
6166 | sector_t max_sectors, resync, res; |
6167 | unsigned long dt, db; | |
6168 | sector_t rt; | |
4588b42e N |
6169 | int scale; |
6170 | unsigned int per_milli; | |
1da177e4 | 6171 | |
dd71cf6b | 6172 | resync = mddev->curr_resync - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6173 | |
6174 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
dd71cf6b | 6175 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 6176 | else |
dd71cf6b | 6177 | max_sectors = mddev->dev_sectors; |
1da177e4 LT |
6178 | |
6179 | /* | |
6180 | * Should not happen. | |
6181 | */ | |
dd71cf6b | 6182 | if (!max_sectors) { |
1da177e4 LT |
6183 | MD_BUG(); |
6184 | return; | |
6185 | } | |
4588b42e | 6186 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 6187 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
6188 | * u32, as those are the requirements for sector_div. |
6189 | * Thus 'scale' must be at least 10 | |
6190 | */ | |
6191 | scale = 10; | |
6192 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 6193 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
6194 | scale++; |
6195 | } | |
6196 | res = (resync>>scale)*1000; | |
dd71cf6b | 6197 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
6198 | |
6199 | per_milli = res; | |
1da177e4 | 6200 | { |
4588b42e | 6201 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
6202 | seq_printf(seq, "["); |
6203 | for (i = 0; i < x; i++) | |
6204 | seq_printf(seq, "="); | |
6205 | seq_printf(seq, ">"); | |
6206 | for (i = 0; i < y; i++) | |
6207 | seq_printf(seq, "."); | |
6208 | seq_printf(seq, "] "); | |
6209 | } | |
4588b42e | 6210 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
6211 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
6212 | "reshape" : | |
61df9d91 N |
6213 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
6214 | "check" : | |
6215 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
6216 | "resync" : "recovery"))), | |
6217 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
6218 | (unsigned long long) resync/2, |
6219 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
6220 | |
6221 | /* | |
1da177e4 LT |
6222 | * dt: time from mark until now |
6223 | * db: blocks written from mark until now | |
6224 | * rt: remaining time | |
dd71cf6b N |
6225 | * |
6226 | * rt is a sector_t, so could be 32bit or 64bit. | |
6227 | * So we divide before multiply in case it is 32bit and close | |
6228 | * to the limit. | |
6229 | * We scale the divisor (db) by 32 to avoid loosing precision | |
6230 | * near the end of resync when the number of remaining sectors | |
6231 | * is close to 'db'. | |
6232 | * We then divide rt by 32 after multiplying by db to compensate. | |
6233 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
6234 | */ |
6235 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
6236 | if (!dt) dt++; | |
ff4e8d9a N |
6237 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
6238 | - mddev->resync_mark_cnt; | |
1da177e4 | 6239 | |
dd71cf6b N |
6240 | rt = max_sectors - resync; /* number of remaining sectors */ |
6241 | sector_div(rt, db/32+1); | |
6242 | rt *= dt; | |
6243 | rt >>= 5; | |
6244 | ||
6245 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
6246 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 6247 | |
ff4e8d9a | 6248 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
6249 | } |
6250 | ||
6251 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
6252 | { | |
6253 | struct list_head *tmp; | |
6254 | loff_t l = *pos; | |
6255 | mddev_t *mddev; | |
6256 | ||
6257 | if (l >= 0x10000) | |
6258 | return NULL; | |
6259 | if (!l--) | |
6260 | /* header */ | |
6261 | return (void*)1; | |
6262 | ||
6263 | spin_lock(&all_mddevs_lock); | |
6264 | list_for_each(tmp,&all_mddevs) | |
6265 | if (!l--) { | |
6266 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
6267 | mddev_get(mddev); | |
6268 | spin_unlock(&all_mddevs_lock); | |
6269 | return mddev; | |
6270 | } | |
6271 | spin_unlock(&all_mddevs_lock); | |
6272 | if (!l--) | |
6273 | return (void*)2;/* tail */ | |
6274 | return NULL; | |
6275 | } | |
6276 | ||
6277 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
6278 | { | |
6279 | struct list_head *tmp; | |
6280 | mddev_t *next_mddev, *mddev = v; | |
6281 | ||
6282 | ++*pos; | |
6283 | if (v == (void*)2) | |
6284 | return NULL; | |
6285 | ||
6286 | spin_lock(&all_mddevs_lock); | |
6287 | if (v == (void*)1) | |
6288 | tmp = all_mddevs.next; | |
6289 | else | |
6290 | tmp = mddev->all_mddevs.next; | |
6291 | if (tmp != &all_mddevs) | |
6292 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
6293 | else { | |
6294 | next_mddev = (void*)2; | |
6295 | *pos = 0x10000; | |
6296 | } | |
6297 | spin_unlock(&all_mddevs_lock); | |
6298 | ||
6299 | if (v != (void*)1) | |
6300 | mddev_put(mddev); | |
6301 | return next_mddev; | |
6302 | ||
6303 | } | |
6304 | ||
6305 | static void md_seq_stop(struct seq_file *seq, void *v) | |
6306 | { | |
6307 | mddev_t *mddev = v; | |
6308 | ||
6309 | if (mddev && v != (void*)1 && v != (void*)2) | |
6310 | mddev_put(mddev); | |
6311 | } | |
6312 | ||
d7603b7e N |
6313 | struct mdstat_info { |
6314 | int event; | |
6315 | }; | |
6316 | ||
1da177e4 LT |
6317 | static int md_seq_show(struct seq_file *seq, void *v) |
6318 | { | |
6319 | mddev_t *mddev = v; | |
dd8ac336 | 6320 | sector_t sectors; |
1da177e4 | 6321 | mdk_rdev_t *rdev; |
d7603b7e | 6322 | struct mdstat_info *mi = seq->private; |
32a7627c | 6323 | struct bitmap *bitmap; |
1da177e4 LT |
6324 | |
6325 | if (v == (void*)1) { | |
2604b703 | 6326 | struct mdk_personality *pers; |
1da177e4 LT |
6327 | seq_printf(seq, "Personalities : "); |
6328 | spin_lock(&pers_lock); | |
2604b703 N |
6329 | list_for_each_entry(pers, &pers_list, list) |
6330 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
6331 | |
6332 | spin_unlock(&pers_lock); | |
6333 | seq_printf(seq, "\n"); | |
d7603b7e | 6334 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
6335 | return 0; |
6336 | } | |
6337 | if (v == (void*)2) { | |
6338 | status_unused(seq); | |
6339 | return 0; | |
6340 | } | |
6341 | ||
5dc5cf7d | 6342 | if (mddev_lock(mddev) < 0) |
1da177e4 | 6343 | return -EINTR; |
5dc5cf7d | 6344 | |
1da177e4 LT |
6345 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
6346 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
6347 | mddev->pers ? "" : "in"); | |
6348 | if (mddev->pers) { | |
f91de92e | 6349 | if (mddev->ro==1) |
1da177e4 | 6350 | seq_printf(seq, " (read-only)"); |
f91de92e | 6351 | if (mddev->ro==2) |
52720ae7 | 6352 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
6353 | seq_printf(seq, " %s", mddev->pers->name); |
6354 | } | |
6355 | ||
dd8ac336 | 6356 | sectors = 0; |
159ec1fc | 6357 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
6358 | char b[BDEVNAME_SIZE]; |
6359 | seq_printf(seq, " %s[%d]", | |
6360 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
6361 | if (test_bit(WriteMostly, &rdev->flags)) |
6362 | seq_printf(seq, "(W)"); | |
b2d444d7 | 6363 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6364 | seq_printf(seq, "(F)"); |
6365 | continue; | |
b325a32e N |
6366 | } else if (rdev->raid_disk < 0) |
6367 | seq_printf(seq, "(S)"); /* spare */ | |
dd8ac336 | 6368 | sectors += rdev->sectors; |
1da177e4 LT |
6369 | } |
6370 | ||
6371 | if (!list_empty(&mddev->disks)) { | |
6372 | if (mddev->pers) | |
6373 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
6374 | (unsigned long long) |
6375 | mddev->array_sectors / 2); | |
1da177e4 LT |
6376 | else |
6377 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 6378 | (unsigned long long)sectors / 2); |
1da177e4 | 6379 | } |
1cd6bf19 N |
6380 | if (mddev->persistent) { |
6381 | if (mddev->major_version != 0 || | |
6382 | mddev->minor_version != 90) { | |
6383 | seq_printf(seq," super %d.%d", | |
6384 | mddev->major_version, | |
6385 | mddev->minor_version); | |
6386 | } | |
e691063a N |
6387 | } else if (mddev->external) |
6388 | seq_printf(seq, " super external:%s", | |
6389 | mddev->metadata_type); | |
6390 | else | |
1cd6bf19 | 6391 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
6392 | |
6393 | if (mddev->pers) { | |
d710e138 | 6394 | mddev->pers->status(seq, mddev); |
1da177e4 | 6395 | seq_printf(seq, "\n "); |
8e1b39d6 N |
6396 | if (mddev->pers->sync_request) { |
6397 | if (mddev->curr_resync > 2) { | |
d710e138 | 6398 | status_resync(seq, mddev); |
8e1b39d6 N |
6399 | seq_printf(seq, "\n "); |
6400 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
6401 | seq_printf(seq, "\tresync=DELAYED\n "); | |
6402 | else if (mddev->recovery_cp < MaxSector) | |
6403 | seq_printf(seq, "\tresync=PENDING\n "); | |
6404 | } | |
32a7627c N |
6405 | } else |
6406 | seq_printf(seq, "\n "); | |
6407 | ||
6408 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
6409 | unsigned long chunk_kb; |
6410 | unsigned long flags; | |
32a7627c | 6411 | spin_lock_irqsave(&bitmap->lock, flags); |
42a04b50 | 6412 | chunk_kb = mddev->bitmap_info.chunksize >> 10; |
32a7627c N |
6413 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " |
6414 | "%lu%s chunk", | |
6415 | bitmap->pages - bitmap->missing_pages, | |
6416 | bitmap->pages, | |
6417 | (bitmap->pages - bitmap->missing_pages) | |
6418 | << (PAGE_SHIFT - 10), | |
42a04b50 | 6419 | chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize, |
32a7627c | 6420 | chunk_kb ? "KB" : "B"); |
78d742d8 N |
6421 | if (bitmap->file) { |
6422 | seq_printf(seq, ", file: "); | |
c32c2f63 | 6423 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 6424 | } |
78d742d8 | 6425 | |
32a7627c N |
6426 | seq_printf(seq, "\n"); |
6427 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
6428 | } |
6429 | ||
6430 | seq_printf(seq, "\n"); | |
6431 | } | |
6432 | mddev_unlock(mddev); | |
6433 | ||
6434 | return 0; | |
6435 | } | |
6436 | ||
110518bc | 6437 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
6438 | .start = md_seq_start, |
6439 | .next = md_seq_next, | |
6440 | .stop = md_seq_stop, | |
6441 | .show = md_seq_show, | |
6442 | }; | |
6443 | ||
6444 | static int md_seq_open(struct inode *inode, struct file *file) | |
6445 | { | |
6446 | int error; | |
d7603b7e N |
6447 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
6448 | if (mi == NULL) | |
6449 | return -ENOMEM; | |
1da177e4 LT |
6450 | |
6451 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
6452 | if (error) |
6453 | kfree(mi); | |
6454 | else { | |
6455 | struct seq_file *p = file->private_data; | |
6456 | p->private = mi; | |
6457 | mi->event = atomic_read(&md_event_count); | |
6458 | } | |
1da177e4 LT |
6459 | return error; |
6460 | } | |
6461 | ||
d7603b7e N |
6462 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
6463 | { | |
6464 | struct seq_file *m = filp->private_data; | |
6465 | struct mdstat_info *mi = m->private; | |
6466 | int mask; | |
6467 | ||
6468 | poll_wait(filp, &md_event_waiters, wait); | |
6469 | ||
6470 | /* always allow read */ | |
6471 | mask = POLLIN | POLLRDNORM; | |
6472 | ||
6473 | if (mi->event != atomic_read(&md_event_count)) | |
6474 | mask |= POLLERR | POLLPRI; | |
6475 | return mask; | |
6476 | } | |
6477 | ||
fa027c2a | 6478 | static const struct file_operations md_seq_fops = { |
e24650c2 | 6479 | .owner = THIS_MODULE, |
1da177e4 LT |
6480 | .open = md_seq_open, |
6481 | .read = seq_read, | |
6482 | .llseek = seq_lseek, | |
c3f94b40 | 6483 | .release = seq_release_private, |
d7603b7e | 6484 | .poll = mdstat_poll, |
1da177e4 LT |
6485 | }; |
6486 | ||
2604b703 | 6487 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 6488 | { |
1da177e4 | 6489 | spin_lock(&pers_lock); |
2604b703 N |
6490 | list_add_tail(&p->list, &pers_list); |
6491 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
6492 | spin_unlock(&pers_lock); |
6493 | return 0; | |
6494 | } | |
6495 | ||
2604b703 | 6496 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 6497 | { |
2604b703 | 6498 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 6499 | spin_lock(&pers_lock); |
2604b703 | 6500 | list_del_init(&p->list); |
1da177e4 LT |
6501 | spin_unlock(&pers_lock); |
6502 | return 0; | |
6503 | } | |
6504 | ||
eea1bf38 | 6505 | static int is_mddev_idle(mddev_t *mddev, int init) |
1da177e4 LT |
6506 | { |
6507 | mdk_rdev_t * rdev; | |
1da177e4 | 6508 | int idle; |
eea1bf38 | 6509 | int curr_events; |
1da177e4 LT |
6510 | |
6511 | idle = 1; | |
4b80991c N |
6512 | rcu_read_lock(); |
6513 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 6514 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
6515 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
6516 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
6517 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
6518 | /* sync IO will cause sync_io to increase before the disk_stats |
6519 | * as sync_io is counted when a request starts, and | |
6520 | * disk_stats is counted when it completes. | |
6521 | * So resync activity will cause curr_events to be smaller than | |
6522 | * when there was no such activity. | |
6523 | * non-sync IO will cause disk_stat to increase without | |
6524 | * increasing sync_io so curr_events will (eventually) | |
6525 | * be larger than it was before. Once it becomes | |
6526 | * substantially larger, the test below will cause | |
6527 | * the array to appear non-idle, and resync will slow | |
6528 | * down. | |
6529 | * If there is a lot of outstanding resync activity when | |
6530 | * we set last_event to curr_events, then all that activity | |
6531 | * completing might cause the array to appear non-idle | |
6532 | * and resync will be slowed down even though there might | |
6533 | * not have been non-resync activity. This will only | |
6534 | * happen once though. 'last_events' will soon reflect | |
6535 | * the state where there is little or no outstanding | |
6536 | * resync requests, and further resync activity will | |
6537 | * always make curr_events less than last_events. | |
c0e48521 | 6538 | * |
1da177e4 | 6539 | */ |
eea1bf38 | 6540 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
6541 | rdev->last_events = curr_events; |
6542 | idle = 0; | |
6543 | } | |
6544 | } | |
4b80991c | 6545 | rcu_read_unlock(); |
1da177e4 LT |
6546 | return idle; |
6547 | } | |
6548 | ||
6549 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
6550 | { | |
6551 | /* another "blocks" (512byte) blocks have been synced */ | |
6552 | atomic_sub(blocks, &mddev->recovery_active); | |
6553 | wake_up(&mddev->recovery_wait); | |
6554 | if (!ok) { | |
dfc70645 | 6555 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6556 | md_wakeup_thread(mddev->thread); |
6557 | // stop recovery, signal do_sync .... | |
6558 | } | |
6559 | } | |
6560 | ||
6561 | ||
06d91a5f N |
6562 | /* md_write_start(mddev, bi) |
6563 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
6564 | * in superblock) before writing, schedule a superblock update |
6565 | * and wait for it to complete. | |
06d91a5f | 6566 | */ |
3d310eb7 | 6567 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 6568 | { |
0fd62b86 | 6569 | int did_change = 0; |
06d91a5f | 6570 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 6571 | return; |
06d91a5f | 6572 | |
f91de92e N |
6573 | BUG_ON(mddev->ro == 1); |
6574 | if (mddev->ro == 2) { | |
6575 | /* need to switch to read/write */ | |
6576 | mddev->ro = 0; | |
6577 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6578 | md_wakeup_thread(mddev->thread); | |
25156198 | 6579 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 6580 | did_change = 1; |
f91de92e | 6581 | } |
06d91a5f | 6582 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
6583 | if (mddev->safemode == 1) |
6584 | mddev->safemode = 0; | |
06d91a5f | 6585 | if (mddev->in_sync) { |
a9701a30 | 6586 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
6587 | if (mddev->in_sync) { |
6588 | mddev->in_sync = 0; | |
850b2b42 | 6589 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 6590 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 6591 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 6592 | did_change = 1; |
3d310eb7 | 6593 | } |
a9701a30 | 6594 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 6595 | } |
0fd62b86 | 6596 | if (did_change) |
00bcb4ac | 6597 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 6598 | wait_event(mddev->sb_wait, |
09a44cc1 | 6599 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 LT |
6600 | } |
6601 | ||
6602 | void md_write_end(mddev_t *mddev) | |
6603 | { | |
6604 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
6605 | if (mddev->safemode == 2) | |
6606 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 6607 | else if (mddev->safemode_delay) |
1da177e4 LT |
6608 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
6609 | } | |
6610 | } | |
6611 | ||
2a2275d6 N |
6612 | /* md_allow_write(mddev) |
6613 | * Calling this ensures that the array is marked 'active' so that writes | |
6614 | * may proceed without blocking. It is important to call this before | |
6615 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
6616 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
6617 | * |
6618 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
6619 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 6620 | */ |
b5470dc5 | 6621 | int md_allow_write(mddev_t *mddev) |
2a2275d6 N |
6622 | { |
6623 | if (!mddev->pers) | |
b5470dc5 | 6624 | return 0; |
2a2275d6 | 6625 | if (mddev->ro) |
b5470dc5 | 6626 | return 0; |
1a0fd497 | 6627 | if (!mddev->pers->sync_request) |
b5470dc5 | 6628 | return 0; |
2a2275d6 N |
6629 | |
6630 | spin_lock_irq(&mddev->write_lock); | |
6631 | if (mddev->in_sync) { | |
6632 | mddev->in_sync = 0; | |
6633 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 6634 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
6635 | if (mddev->safemode_delay && |
6636 | mddev->safemode == 0) | |
6637 | mddev->safemode = 1; | |
6638 | spin_unlock_irq(&mddev->write_lock); | |
6639 | md_update_sb(mddev, 0); | |
00bcb4ac | 6640 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 N |
6641 | } else |
6642 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 | 6643 | |
070dc6dd | 6644 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
6645 | return -EAGAIN; |
6646 | else | |
6647 | return 0; | |
2a2275d6 N |
6648 | } |
6649 | EXPORT_SYMBOL_GPL(md_allow_write); | |
6650 | ||
b63d7c2e | 6651 | void md_unplug(mddev_t *mddev) |
252ac522 N |
6652 | { |
6653 | if (mddev->queue) | |
6654 | blk_unplug(mddev->queue); | |
6655 | if (mddev->plug) | |
6656 | mddev->plug->unplug_fn(mddev->plug); | |
6657 | } | |
6658 | ||
1da177e4 LT |
6659 | #define SYNC_MARKS 10 |
6660 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 6661 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
6662 | { |
6663 | mddev_t *mddev2; | |
6664 | unsigned int currspeed = 0, | |
6665 | window; | |
57afd89f | 6666 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
6667 | unsigned long mark[SYNC_MARKS]; |
6668 | sector_t mark_cnt[SYNC_MARKS]; | |
6669 | int last_mark,m; | |
6670 | struct list_head *tmp; | |
6671 | sector_t last_check; | |
57afd89f | 6672 | int skipped = 0; |
5fd6c1dc | 6673 | mdk_rdev_t *rdev; |
61df9d91 | 6674 | char *desc; |
1da177e4 LT |
6675 | |
6676 | /* just incase thread restarts... */ | |
6677 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
6678 | return; | |
5fd6c1dc N |
6679 | if (mddev->ro) /* never try to sync a read-only array */ |
6680 | return; | |
1da177e4 | 6681 | |
61df9d91 N |
6682 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
6683 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
6684 | desc = "data-check"; | |
6685 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6686 | desc = "requested-resync"; | |
6687 | else | |
6688 | desc = "resync"; | |
6689 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
6690 | desc = "reshape"; | |
6691 | else | |
6692 | desc = "recovery"; | |
6693 | ||
1da177e4 LT |
6694 | /* we overload curr_resync somewhat here. |
6695 | * 0 == not engaged in resync at all | |
6696 | * 2 == checking that there is no conflict with another sync | |
6697 | * 1 == like 2, but have yielded to allow conflicting resync to | |
6698 | * commense | |
6699 | * other == active in resync - this many blocks | |
6700 | * | |
6701 | * Before starting a resync we must have set curr_resync to | |
6702 | * 2, and then checked that every "conflicting" array has curr_resync | |
6703 | * less than ours. When we find one that is the same or higher | |
6704 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
6705 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
6706 | * This will mean we have to start checking from the beginning again. | |
6707 | * | |
6708 | */ | |
6709 | ||
6710 | do { | |
6711 | mddev->curr_resync = 2; | |
6712 | ||
6713 | try_again: | |
404e4b43 | 6714 | if (kthread_should_stop()) |
6985c43f | 6715 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
404e4b43 N |
6716 | |
6717 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
1da177e4 | 6718 | goto skip; |
29ac4aa3 | 6719 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
6720 | if (mddev2 == mddev) |
6721 | continue; | |
90b08710 BS |
6722 | if (!mddev->parallel_resync |
6723 | && mddev2->curr_resync | |
6724 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
6725 | DEFINE_WAIT(wq); |
6726 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
6727 | /* arbitrarily yield */ | |
6728 | mddev->curr_resync = 1; | |
6729 | wake_up(&resync_wait); | |
6730 | } | |
6731 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
6732 | /* no need to wait here, we can wait the next | |
6733 | * time 'round when curr_resync == 2 | |
6734 | */ | |
6735 | continue; | |
9744197c N |
6736 | /* We need to wait 'interruptible' so as not to |
6737 | * contribute to the load average, and not to | |
6738 | * be caught by 'softlockup' | |
6739 | */ | |
6740 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 6741 | if (!kthread_should_stop() && |
8712e553 | 6742 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
6743 | printk(KERN_INFO "md: delaying %s of %s" |
6744 | " until %s has finished (they" | |
1da177e4 | 6745 | " share one or more physical units)\n", |
61df9d91 | 6746 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 6747 | mddev_put(mddev2); |
9744197c N |
6748 | if (signal_pending(current)) |
6749 | flush_signals(current); | |
1da177e4 LT |
6750 | schedule(); |
6751 | finish_wait(&resync_wait, &wq); | |
6752 | goto try_again; | |
6753 | } | |
6754 | finish_wait(&resync_wait, &wq); | |
6755 | } | |
6756 | } | |
6757 | } while (mddev->curr_resync < 2); | |
6758 | ||
5fd6c1dc | 6759 | j = 0; |
9d88883e | 6760 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 6761 | /* resync follows the size requested by the personality, |
57afd89f | 6762 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
6763 | */ |
6764 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 6765 | mddev->resync_mismatches = 0; |
5fd6c1dc | 6766 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
6767 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
6768 | j = mddev->resync_min; | |
6769 | else if (!mddev->bitmap) | |
5fd6c1dc | 6770 | j = mddev->recovery_cp; |
5e96ee65 | 6771 | |
ccfcc3c1 | 6772 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
58c0fed4 | 6773 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6774 | else { |
1da177e4 | 6775 | /* recovery follows the physical size of devices */ |
58c0fed4 | 6776 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6777 | j = MaxSector; |
4e59ca7d DW |
6778 | rcu_read_lock(); |
6779 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc N |
6780 | if (rdev->raid_disk >= 0 && |
6781 | !test_bit(Faulty, &rdev->flags) && | |
6782 | !test_bit(In_sync, &rdev->flags) && | |
6783 | rdev->recovery_offset < j) | |
6784 | j = rdev->recovery_offset; | |
4e59ca7d | 6785 | rcu_read_unlock(); |
5fd6c1dc | 6786 | } |
1da177e4 | 6787 | |
61df9d91 N |
6788 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
6789 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
6790 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 6791 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
6792 | "(but not more than %d KB/sec) for %s.\n", |
6793 | speed_max(mddev), desc); | |
1da177e4 | 6794 | |
eea1bf38 | 6795 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 6796 | |
57afd89f | 6797 | io_sectors = 0; |
1da177e4 LT |
6798 | for (m = 0; m < SYNC_MARKS; m++) { |
6799 | mark[m] = jiffies; | |
57afd89f | 6800 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
6801 | } |
6802 | last_mark = 0; | |
6803 | mddev->resync_mark = mark[last_mark]; | |
6804 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
6805 | ||
6806 | /* | |
6807 | * Tune reconstruction: | |
6808 | */ | |
6809 | window = 32*(PAGE_SIZE/512); | |
6810 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
6811 | window/2,(unsigned long long) max_sectors/2); | |
6812 | ||
6813 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
6814 | last_check = 0; |
6815 | ||
6816 | if (j>2) { | |
6817 | printk(KERN_INFO | |
61df9d91 N |
6818 | "md: resuming %s of %s from checkpoint.\n", |
6819 | desc, mdname(mddev)); | |
1da177e4 LT |
6820 | mddev->curr_resync = j; |
6821 | } | |
efa59339 | 6822 | mddev->curr_resync_completed = mddev->curr_resync; |
1da177e4 LT |
6823 | |
6824 | while (j < max_sectors) { | |
57afd89f | 6825 | sector_t sectors; |
1da177e4 | 6826 | |
57afd89f | 6827 | skipped = 0; |
97e4f42d | 6828 | |
7a91ee1f N |
6829 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
6830 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
6831 | (mddev->curr_resync - mddev->curr_resync_completed) | |
6832 | > (max_sectors >> 4)) || | |
6833 | (j - mddev->curr_resync_completed)*2 | |
6834 | >= mddev->resync_max - mddev->curr_resync_completed | |
6835 | )) { | |
97e4f42d | 6836 | /* time to update curr_resync_completed */ |
252ac522 | 6837 | md_unplug(mddev); |
97e4f42d N |
6838 | wait_event(mddev->recovery_wait, |
6839 | atomic_read(&mddev->recovery_active) == 0); | |
6840 | mddev->curr_resync_completed = | |
6841 | mddev->curr_resync; | |
070dc6dd | 6842 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 6843 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 6844 | } |
acb180b0 | 6845 | |
e62e58a5 N |
6846 | while (j >= mddev->resync_max && !kthread_should_stop()) { |
6847 | /* As this condition is controlled by user-space, | |
6848 | * we can block indefinitely, so use '_interruptible' | |
6849 | * to avoid triggering warnings. | |
6850 | */ | |
6851 | flush_signals(current); /* just in case */ | |
6852 | wait_event_interruptible(mddev->recovery_wait, | |
6853 | mddev->resync_max > j | |
6854 | || kthread_should_stop()); | |
6855 | } | |
acb180b0 N |
6856 | |
6857 | if (kthread_should_stop()) | |
6858 | goto interrupted; | |
6859 | ||
57afd89f | 6860 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 6861 | currspeed < speed_min(mddev)); |
57afd89f | 6862 | if (sectors == 0) { |
dfc70645 | 6863 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6864 | goto out; |
6865 | } | |
57afd89f N |
6866 | |
6867 | if (!skipped) { /* actual IO requested */ | |
6868 | io_sectors += sectors; | |
6869 | atomic_add(sectors, &mddev->recovery_active); | |
6870 | } | |
6871 | ||
1da177e4 LT |
6872 | j += sectors; |
6873 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 6874 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
6875 | if (last_check == 0) |
6876 | /* this is the earliers that rebuilt will be | |
6877 | * visible in /proc/mdstat | |
6878 | */ | |
6879 | md_new_event(mddev); | |
57afd89f N |
6880 | |
6881 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
6882 | continue; |
6883 | ||
57afd89f | 6884 | last_check = io_sectors; |
1da177e4 | 6885 | |
dfc70645 | 6886 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 LT |
6887 | break; |
6888 | ||
6889 | repeat: | |
6890 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
6891 | /* step marks */ | |
6892 | int next = (last_mark+1) % SYNC_MARKS; | |
6893 | ||
6894 | mddev->resync_mark = mark[next]; | |
6895 | mddev->resync_mark_cnt = mark_cnt[next]; | |
6896 | mark[next] = jiffies; | |
57afd89f | 6897 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6898 | last_mark = next; |
6899 | } | |
6900 | ||
6901 | ||
c6207277 N |
6902 | if (kthread_should_stop()) |
6903 | goto interrupted; | |
6904 | ||
1da177e4 LT |
6905 | |
6906 | /* | |
6907 | * this loop exits only if either when we are slower than | |
6908 | * the 'hard' speed limit, or the system was IO-idle for | |
6909 | * a jiffy. | |
6910 | * the system might be non-idle CPU-wise, but we only care | |
6911 | * about not overloading the IO subsystem. (things like an | |
6912 | * e2fsck being done on the RAID array should execute fast) | |
6913 | */ | |
252ac522 | 6914 | md_unplug(mddev); |
1da177e4 LT |
6915 | cond_resched(); |
6916 | ||
57afd89f N |
6917 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
6918 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 6919 | |
88202a0c N |
6920 | if (currspeed > speed_min(mddev)) { |
6921 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 6922 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 6923 | msleep(500); |
1da177e4 LT |
6924 | goto repeat; |
6925 | } | |
6926 | } | |
6927 | } | |
61df9d91 | 6928 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
6929 | /* |
6930 | * this also signals 'finished resyncing' to md_stop | |
6931 | */ | |
6932 | out: | |
252ac522 | 6933 | md_unplug(mddev); |
1da177e4 LT |
6934 | |
6935 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
6936 | ||
6937 | /* tell personality that we are finished */ | |
57afd89f | 6938 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 6939 | |
dfc70645 | 6940 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
6941 | mddev->curr_resync > 2) { |
6942 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
6943 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
6944 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
6945 | printk(KERN_INFO | |
61df9d91 N |
6946 | "md: checkpointing %s of %s.\n", |
6947 | desc, mdname(mddev)); | |
5fd6c1dc N |
6948 | mddev->recovery_cp = mddev->curr_resync; |
6949 | } | |
6950 | } else | |
6951 | mddev->recovery_cp = MaxSector; | |
6952 | } else { | |
6953 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6954 | mddev->curr_resync = MaxSector; | |
4e59ca7d DW |
6955 | rcu_read_lock(); |
6956 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc | 6957 | if (rdev->raid_disk >= 0 && |
70fffd0b | 6958 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
6959 | !test_bit(Faulty, &rdev->flags) && |
6960 | !test_bit(In_sync, &rdev->flags) && | |
6961 | rdev->recovery_offset < mddev->curr_resync) | |
6962 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 6963 | rcu_read_unlock(); |
5fd6c1dc | 6964 | } |
1da177e4 | 6965 | } |
17571284 | 6966 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6967 | |
1da177e4 | 6968 | skip: |
c07b70ad N |
6969 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
6970 | /* We completed so min/max setting can be forgotten if used. */ | |
6971 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6972 | mddev->resync_min = 0; | |
6973 | mddev->resync_max = MaxSector; | |
6974 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6975 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 | 6976 | mddev->curr_resync = 0; |
efa59339 N |
6977 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
6978 | mddev->curr_resync_completed = 0; | |
c6207277 | 6979 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
1da177e4 LT |
6980 | wake_up(&resync_wait); |
6981 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
6982 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
6983 | return; |
6984 | ||
6985 | interrupted: | |
6986 | /* | |
6987 | * got a signal, exit. | |
6988 | */ | |
6989 | printk(KERN_INFO | |
6990 | "md: md_do_sync() got signal ... exiting\n"); | |
6991 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6992 | goto out; | |
6993 | ||
1da177e4 | 6994 | } |
29269553 | 6995 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
6996 | |
6997 | ||
b4c4c7b8 N |
6998 | static int remove_and_add_spares(mddev_t *mddev) |
6999 | { | |
7000 | mdk_rdev_t *rdev; | |
b4c4c7b8 N |
7001 | int spares = 0; |
7002 | ||
97e4f42d N |
7003 | mddev->curr_resync_completed = 0; |
7004 | ||
159ec1fc | 7005 | list_for_each_entry(rdev, &mddev->disks, same_set) |
b4c4c7b8 | 7006 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 7007 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
7008 | (test_bit(Faulty, &rdev->flags) || |
7009 | ! test_bit(In_sync, &rdev->flags)) && | |
7010 | atomic_read(&rdev->nr_pending)==0) { | |
7011 | if (mddev->pers->hot_remove_disk( | |
7012 | mddev, rdev->raid_disk)==0) { | |
7013 | char nm[20]; | |
7014 | sprintf(nm,"rd%d", rdev->raid_disk); | |
7015 | sysfs_remove_link(&mddev->kobj, nm); | |
7016 | rdev->raid_disk = -1; | |
7017 | } | |
7018 | } | |
7019 | ||
4044ba58 | 7020 | if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) { |
159ec1fc | 7021 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dfc70645 | 7022 | if (rdev->raid_disk >= 0 && |
e5427135 DW |
7023 | !test_bit(In_sync, &rdev->flags) && |
7024 | !test_bit(Blocked, &rdev->flags)) | |
dfc70645 | 7025 | spares++; |
b4c4c7b8 N |
7026 | if (rdev->raid_disk < 0 |
7027 | && !test_bit(Faulty, &rdev->flags)) { | |
7028 | rdev->recovery_offset = 0; | |
199050ea NB |
7029 | if (mddev->pers-> |
7030 | hot_add_disk(mddev, rdev) == 0) { | |
b4c4c7b8 N |
7031 | char nm[20]; |
7032 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
7033 | if (sysfs_create_link(&mddev->kobj, |
7034 | &rdev->kobj, nm)) | |
00bcb4ac | 7035 | /* failure here is OK */; |
b4c4c7b8 N |
7036 | spares++; |
7037 | md_new_event(mddev); | |
93be75ff | 7038 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
b4c4c7b8 N |
7039 | } else |
7040 | break; | |
7041 | } | |
dfc70645 | 7042 | } |
b4c4c7b8 N |
7043 | } |
7044 | return spares; | |
7045 | } | |
7ebc0be7 N |
7046 | |
7047 | static void reap_sync_thread(mddev_t *mddev) | |
7048 | { | |
7049 | mdk_rdev_t *rdev; | |
7050 | ||
7051 | /* resync has finished, collect result */ | |
7052 | md_unregister_thread(mddev->sync_thread); | |
7053 | mddev->sync_thread = NULL; | |
7054 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
7055 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
7056 | /* success...*/ | |
7057 | /* activate any spares */ | |
7058 | if (mddev->pers->spare_active(mddev)) | |
7059 | sysfs_notify(&mddev->kobj, NULL, | |
7060 | "degraded"); | |
7061 | } | |
7062 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
7063 | mddev->pers->finish_reshape) | |
7064 | mddev->pers->finish_reshape(mddev); | |
7065 | md_update_sb(mddev, 1); | |
7066 | ||
7067 | /* if array is no-longer degraded, then any saved_raid_disk | |
7068 | * information must be scrapped | |
7069 | */ | |
7070 | if (!mddev->degraded) | |
7071 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
7072 | rdev->saved_raid_disk = -1; | |
7073 | ||
7074 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7075 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7076 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7077 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7078 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7079 | /* flag recovery needed just to double check */ | |
7080 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7081 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7082 | md_new_event(mddev); | |
7083 | } | |
7084 | ||
1da177e4 LT |
7085 | /* |
7086 | * This routine is regularly called by all per-raid-array threads to | |
7087 | * deal with generic issues like resync and super-block update. | |
7088 | * Raid personalities that don't have a thread (linear/raid0) do not | |
7089 | * need this as they never do any recovery or update the superblock. | |
7090 | * | |
7091 | * It does not do any resync itself, but rather "forks" off other threads | |
7092 | * to do that as needed. | |
7093 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
7094 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 7095 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
7096 | * and wakeups up this thread which will reap the thread and finish up. |
7097 | * This thread also removes any faulty devices (with nr_pending == 0). | |
7098 | * | |
7099 | * The overall approach is: | |
7100 | * 1/ if the superblock needs updating, update it. | |
7101 | * 2/ If a recovery thread is running, don't do anything else. | |
7102 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
7103 | * 4/ If there are any faulty devices, remove them. | |
7104 | * 5/ If array is degraded, try to add spares devices | |
7105 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
7106 | */ | |
7107 | void md_check_recovery(mddev_t *mddev) | |
7108 | { | |
5f40402d | 7109 | if (mddev->bitmap) |
aa5cbd10 | 7110 | bitmap_daemon_work(mddev); |
1da177e4 LT |
7111 | |
7112 | if (mddev->ro) | |
7113 | return; | |
fca4d848 N |
7114 | |
7115 | if (signal_pending(current)) { | |
31a59e34 | 7116 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
7117 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
7118 | mdname(mddev)); | |
7119 | mddev->safemode = 2; | |
7120 | } | |
7121 | flush_signals(current); | |
7122 | } | |
7123 | ||
c89a8eee N |
7124 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
7125 | return; | |
1da177e4 | 7126 | if ( ! ( |
126925c0 | 7127 | (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 7128 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 7129 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 7130 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
7131 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
7132 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
7133 | )) |
7134 | return; | |
fca4d848 | 7135 | |
df5b89b3 | 7136 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 7137 | int spares = 0; |
fca4d848 | 7138 | |
c89a8eee N |
7139 | if (mddev->ro) { |
7140 | /* Only thing we do on a ro array is remove | |
7141 | * failed devices. | |
7142 | */ | |
7143 | remove_and_add_spares(mddev); | |
7144 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7145 | goto unlock; | |
7146 | } | |
7147 | ||
31a59e34 | 7148 | if (!mddev->external) { |
0fd62b86 | 7149 | int did_change = 0; |
31a59e34 N |
7150 | spin_lock_irq(&mddev->write_lock); |
7151 | if (mddev->safemode && | |
7152 | !atomic_read(&mddev->writes_pending) && | |
7153 | !mddev->in_sync && | |
7154 | mddev->recovery_cp == MaxSector) { | |
7155 | mddev->in_sync = 1; | |
0fd62b86 | 7156 | did_change = 1; |
070dc6dd | 7157 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
7158 | } |
7159 | if (mddev->safemode == 1) | |
7160 | mddev->safemode = 0; | |
7161 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 7162 | if (did_change) |
00bcb4ac | 7163 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 7164 | } |
fca4d848 | 7165 | |
850b2b42 N |
7166 | if (mddev->flags) |
7167 | md_update_sb(mddev, 0); | |
06d91a5f | 7168 | |
1da177e4 LT |
7169 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
7170 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
7171 | /* resync/recovery still happening */ | |
7172 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7173 | goto unlock; | |
7174 | } | |
7175 | if (mddev->sync_thread) { | |
7ebc0be7 | 7176 | reap_sync_thread(mddev); |
1da177e4 LT |
7177 | goto unlock; |
7178 | } | |
72a23c21 NB |
7179 | /* Set RUNNING before clearing NEEDED to avoid |
7180 | * any transients in the value of "sync_action". | |
7181 | */ | |
7182 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7183 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
7184 | /* Clear some bits that don't mean anything, but |
7185 | * might be left set | |
7186 | */ | |
24dd469d N |
7187 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7188 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 7189 | |
5fd6c1dc N |
7190 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
7191 | goto unlock; | |
1da177e4 LT |
7192 | /* no recovery is running. |
7193 | * remove any failed drives, then | |
7194 | * add spares if possible. | |
7195 | * Spare are also removed and re-added, to allow | |
7196 | * the personality to fail the re-add. | |
7197 | */ | |
1da177e4 | 7198 | |
b4c4c7b8 | 7199 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
7200 | if (mddev->pers->check_reshape == NULL || |
7201 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 N |
7202 | /* Cannot proceed */ |
7203 | goto unlock; | |
7204 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 7205 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 7206 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
7207 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7208 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 7209 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 7210 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7211 | } else if (mddev->recovery_cp < MaxSector) { |
7212 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 7213 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7214 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
7215 | /* nothing to be done ... */ | |
1da177e4 | 7216 | goto unlock; |
24dd469d | 7217 | |
1da177e4 | 7218 | if (mddev->pers->sync_request) { |
a654b9d8 N |
7219 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
7220 | /* We are adding a device or devices to an array | |
7221 | * which has the bitmap stored on all devices. | |
7222 | * So make sure all bitmap pages get written | |
7223 | */ | |
7224 | bitmap_write_all(mddev->bitmap); | |
7225 | } | |
1da177e4 LT |
7226 | mddev->sync_thread = md_register_thread(md_do_sync, |
7227 | mddev, | |
0da3c619 | 7228 | "resync"); |
1da177e4 LT |
7229 | if (!mddev->sync_thread) { |
7230 | printk(KERN_ERR "%s: could not start resync" | |
7231 | " thread...\n", | |
7232 | mdname(mddev)); | |
7233 | /* leave the spares where they are, it shouldn't hurt */ | |
7ebc0be7 N |
7234 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
7235 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7236 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7237 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7238 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
d7603b7e | 7239 | } else |
1da177e4 | 7240 | md_wakeup_thread(mddev->sync_thread); |
00bcb4ac | 7241 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
d7603b7e | 7242 | md_new_event(mddev); |
1da177e4 LT |
7243 | } |
7244 | unlock: | |
72a23c21 NB |
7245 | if (!mddev->sync_thread) { |
7246 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7247 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
7248 | &mddev->recovery)) | |
0c3573f1 | 7249 | if (mddev->sysfs_action) |
00bcb4ac | 7250 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 7251 | } |
1da177e4 LT |
7252 | mddev_unlock(mddev); |
7253 | } | |
7254 | } | |
7255 | ||
6bfe0b49 DW |
7256 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
7257 | { | |
00bcb4ac | 7258 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 DW |
7259 | wait_event_timeout(rdev->blocked_wait, |
7260 | !test_bit(Blocked, &rdev->flags), | |
7261 | msecs_to_jiffies(5000)); | |
7262 | rdev_dec_pending(rdev, mddev); | |
7263 | } | |
7264 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
7265 | ||
75c96f85 AB |
7266 | static int md_notify_reboot(struct notifier_block *this, |
7267 | unsigned long code, void *x) | |
1da177e4 LT |
7268 | { |
7269 | struct list_head *tmp; | |
7270 | mddev_t *mddev; | |
7271 | ||
7272 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
7273 | ||
7274 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
7275 | ||
29ac4aa3 | 7276 | for_each_mddev(mddev, tmp) |
c71d4887 | 7277 | if (mddev_trylock(mddev)) { |
2b25000b N |
7278 | /* Force a switch to readonly even array |
7279 | * appears to still be in use. Hence | |
7280 | * the '100'. | |
7281 | */ | |
a4bd82d0 | 7282 | md_set_readonly(mddev, 100); |
c71d4887 NB |
7283 | mddev_unlock(mddev); |
7284 | } | |
1da177e4 LT |
7285 | /* |
7286 | * certain more exotic SCSI devices are known to be | |
7287 | * volatile wrt too early system reboots. While the | |
7288 | * right place to handle this issue is the given | |
7289 | * driver, we do want to have a safe RAID driver ... | |
7290 | */ | |
7291 | mdelay(1000*1); | |
7292 | } | |
7293 | return NOTIFY_DONE; | |
7294 | } | |
7295 | ||
75c96f85 | 7296 | static struct notifier_block md_notifier = { |
1da177e4 LT |
7297 | .notifier_call = md_notify_reboot, |
7298 | .next = NULL, | |
7299 | .priority = INT_MAX, /* before any real devices */ | |
7300 | }; | |
7301 | ||
7302 | static void md_geninit(void) | |
7303 | { | |
1da177e4 LT |
7304 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
7305 | ||
c7705f34 | 7306 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
7307 | } |
7308 | ||
75c96f85 | 7309 | static int __init md_init(void) |
1da177e4 | 7310 | { |
e804ac78 TH |
7311 | int ret = -ENOMEM; |
7312 | ||
7313 | md_wq = alloc_workqueue("md", WQ_RESCUER, 0); | |
7314 | if (!md_wq) | |
7315 | goto err_wq; | |
7316 | ||
7317 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
7318 | if (!md_misc_wq) | |
7319 | goto err_misc_wq; | |
7320 | ||
7321 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
7322 | goto err_md; | |
7323 | ||
7324 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
7325 | goto err_mdp; | |
7326 | mdp_major = ret; | |
7327 | ||
3dbd8c2e | 7328 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
e8703fe1 N |
7329 | md_probe, NULL, NULL); |
7330 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
7331 | md_probe, NULL, NULL); |
7332 | ||
1da177e4 | 7333 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 7334 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
7335 | |
7336 | md_geninit(); | |
d710e138 | 7337 | return 0; |
1da177e4 | 7338 | |
e804ac78 TH |
7339 | err_mdp: |
7340 | unregister_blkdev(MD_MAJOR, "md"); | |
7341 | err_md: | |
7342 | destroy_workqueue(md_misc_wq); | |
7343 | err_misc_wq: | |
7344 | destroy_workqueue(md_wq); | |
7345 | err_wq: | |
7346 | return ret; | |
7347 | } | |
1da177e4 LT |
7348 | |
7349 | #ifndef MODULE | |
7350 | ||
7351 | /* | |
7352 | * Searches all registered partitions for autorun RAID arrays | |
7353 | * at boot time. | |
7354 | */ | |
4d936ec1 ME |
7355 | |
7356 | static LIST_HEAD(all_detected_devices); | |
7357 | struct detected_devices_node { | |
7358 | struct list_head list; | |
7359 | dev_t dev; | |
7360 | }; | |
1da177e4 LT |
7361 | |
7362 | void md_autodetect_dev(dev_t dev) | |
7363 | { | |
4d936ec1 ME |
7364 | struct detected_devices_node *node_detected_dev; |
7365 | ||
7366 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
7367 | if (node_detected_dev) { | |
7368 | node_detected_dev->dev = dev; | |
7369 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
7370 | } else { | |
7371 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
7372 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
7373 | } | |
1da177e4 LT |
7374 | } |
7375 | ||
7376 | ||
7377 | static void autostart_arrays(int part) | |
7378 | { | |
7379 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
7380 | struct detected_devices_node *node_detected_dev; |
7381 | dev_t dev; | |
7382 | int i_scanned, i_passed; | |
1da177e4 | 7383 | |
4d936ec1 ME |
7384 | i_scanned = 0; |
7385 | i_passed = 0; | |
1da177e4 | 7386 | |
4d936ec1 | 7387 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 7388 | |
4d936ec1 ME |
7389 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
7390 | i_scanned++; | |
7391 | node_detected_dev = list_entry(all_detected_devices.next, | |
7392 | struct detected_devices_node, list); | |
7393 | list_del(&node_detected_dev->list); | |
7394 | dev = node_detected_dev->dev; | |
7395 | kfree(node_detected_dev); | |
df968c4e | 7396 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
7397 | if (IS_ERR(rdev)) |
7398 | continue; | |
7399 | ||
b2d444d7 | 7400 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
7401 | MD_BUG(); |
7402 | continue; | |
7403 | } | |
d0fae18f | 7404 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 7405 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 7406 | i_passed++; |
1da177e4 | 7407 | } |
4d936ec1 ME |
7408 | |
7409 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
7410 | i_scanned, i_passed); | |
1da177e4 LT |
7411 | |
7412 | autorun_devices(part); | |
7413 | } | |
7414 | ||
fdee8ae4 | 7415 | #endif /* !MODULE */ |
1da177e4 LT |
7416 | |
7417 | static __exit void md_exit(void) | |
7418 | { | |
7419 | mddev_t *mddev; | |
7420 | struct list_head *tmp; | |
8ab5e4c1 | 7421 | |
3dbd8c2e | 7422 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
e8703fe1 | 7423 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 7424 | |
3dbd8c2e | 7425 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
7426 | unregister_blkdev(mdp_major, "mdp"); |
7427 | unregister_reboot_notifier(&md_notifier); | |
7428 | unregister_sysctl_table(raid_table_header); | |
7429 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 7430 | for_each_mddev(mddev, tmp) { |
1da177e4 | 7431 | export_array(mddev); |
d3374825 | 7432 | mddev->hold_active = 0; |
1da177e4 | 7433 | } |
e804ac78 TH |
7434 | destroy_workqueue(md_misc_wq); |
7435 | destroy_workqueue(md_wq); | |
1da177e4 LT |
7436 | } |
7437 | ||
685784aa | 7438 | subsys_initcall(md_init); |
1da177e4 LT |
7439 | module_exit(md_exit) |
7440 | ||
f91de92e N |
7441 | static int get_ro(char *buffer, struct kernel_param *kp) |
7442 | { | |
7443 | return sprintf(buffer, "%d", start_readonly); | |
7444 | } | |
7445 | static int set_ro(const char *val, struct kernel_param *kp) | |
7446 | { | |
7447 | char *e; | |
7448 | int num = simple_strtoul(val, &e, 10); | |
7449 | if (*val && (*e == '\0' || *e == '\n')) { | |
7450 | start_readonly = num; | |
4dbcdc75 | 7451 | return 0; |
f91de92e N |
7452 | } |
7453 | return -EINVAL; | |
7454 | } | |
7455 | ||
80ca3a44 N |
7456 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
7457 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 7458 | |
efeb53c0 | 7459 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 7460 | |
1da177e4 LT |
7461 | EXPORT_SYMBOL(register_md_personality); |
7462 | EXPORT_SYMBOL(unregister_md_personality); | |
7463 | EXPORT_SYMBOL(md_error); | |
7464 | EXPORT_SYMBOL(md_done_sync); | |
7465 | EXPORT_SYMBOL(md_write_start); | |
7466 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
7467 | EXPORT_SYMBOL(md_register_thread); |
7468 | EXPORT_SYMBOL(md_unregister_thread); | |
7469 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
7470 | EXPORT_SYMBOL(md_check_recovery); |
7471 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 7472 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 7473 | MODULE_ALIAS("md"); |
72008652 | 7474 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |