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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 BS |
69 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
70 | ||
5e56341d AB |
71 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
72 | ||
1e50915f RB |
73 | /* |
74 | * Default number of read corrections we'll attempt on an rdev | |
75 | * before ejecting it from the array. We divide the read error | |
76 | * count by 2 for every hour elapsed between read errors. | |
77 | */ | |
78 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
79 | /* |
80 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
81 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
82 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 83 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
84 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
85 | * speed limit - in case reconstruction slows down your system despite | |
86 | * idle IO detection. | |
87 | * | |
88 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 89 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
90 | */ |
91 | ||
92 | static int sysctl_speed_limit_min = 1000; | |
93 | static int sysctl_speed_limit_max = 200000; | |
88202a0c N |
94 | static inline int speed_min(mddev_t *mddev) |
95 | { | |
96 | return mddev->sync_speed_min ? | |
97 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
98 | } | |
99 | ||
100 | static inline int speed_max(mddev_t *mddev) | |
101 | { | |
102 | return mddev->sync_speed_max ? | |
103 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
104 | } | |
1da177e4 LT |
105 | |
106 | static struct ctl_table_header *raid_table_header; | |
107 | ||
108 | static ctl_table raid_table[] = { | |
109 | { | |
1da177e4 LT |
110 | .procname = "speed_limit_min", |
111 | .data = &sysctl_speed_limit_min, | |
112 | .maxlen = sizeof(int), | |
80ca3a44 | 113 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 114 | .proc_handler = proc_dointvec, |
1da177e4 LT |
115 | }, |
116 | { | |
1da177e4 LT |
117 | .procname = "speed_limit_max", |
118 | .data = &sysctl_speed_limit_max, | |
119 | .maxlen = sizeof(int), | |
80ca3a44 | 120 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 121 | .proc_handler = proc_dointvec, |
1da177e4 | 122 | }, |
894d2491 | 123 | { } |
1da177e4 LT |
124 | }; |
125 | ||
126 | static ctl_table raid_dir_table[] = { | |
127 | { | |
1da177e4 LT |
128 | .procname = "raid", |
129 | .maxlen = 0, | |
80ca3a44 | 130 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
131 | .child = raid_table, |
132 | }, | |
894d2491 | 133 | { } |
1da177e4 LT |
134 | }; |
135 | ||
136 | static ctl_table raid_root_table[] = { | |
137 | { | |
1da177e4 LT |
138 | .procname = "dev", |
139 | .maxlen = 0, | |
140 | .mode = 0555, | |
141 | .child = raid_dir_table, | |
142 | }, | |
894d2491 | 143 | { } |
1da177e4 LT |
144 | }; |
145 | ||
83d5cde4 | 146 | static const struct block_device_operations md_fops; |
1da177e4 | 147 | |
f91de92e N |
148 | static int start_readonly; |
149 | ||
d7603b7e N |
150 | /* |
151 | * We have a system wide 'event count' that is incremented | |
152 | * on any 'interesting' event, and readers of /proc/mdstat | |
153 | * can use 'poll' or 'select' to find out when the event | |
154 | * count increases. | |
155 | * | |
156 | * Events are: | |
157 | * start array, stop array, error, add device, remove device, | |
158 | * start build, activate spare | |
159 | */ | |
2989ddbd | 160 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 161 | static atomic_t md_event_count; |
29269553 | 162 | void md_new_event(mddev_t *mddev) |
d7603b7e N |
163 | { |
164 | atomic_inc(&md_event_count); | |
165 | wake_up(&md_event_waiters); | |
166 | } | |
29269553 | 167 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 168 | |
c331eb04 N |
169 | /* Alternate version that can be called from interrupts |
170 | * when calling sysfs_notify isn't needed. | |
171 | */ | |
05381954 | 172 | static void md_new_event_inintr(mddev_t *mddev) |
c331eb04 N |
173 | { |
174 | atomic_inc(&md_event_count); | |
175 | wake_up(&md_event_waiters); | |
176 | } | |
177 | ||
1da177e4 LT |
178 | /* |
179 | * Enables to iterate over all existing md arrays | |
180 | * all_mddevs_lock protects this list. | |
181 | */ | |
182 | static LIST_HEAD(all_mddevs); | |
183 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
184 | ||
185 | ||
186 | /* | |
187 | * iterates through all used mddevs in the system. | |
188 | * We take care to grab the all_mddevs_lock whenever navigating | |
189 | * the list, and to always hold a refcount when unlocked. | |
190 | * Any code which breaks out of this loop while own | |
191 | * a reference to the current mddev and must mddev_put it. | |
192 | */ | |
29ac4aa3 | 193 | #define for_each_mddev(mddev,tmp) \ |
1da177e4 LT |
194 | \ |
195 | for (({ spin_lock(&all_mddevs_lock); \ | |
196 | tmp = all_mddevs.next; \ | |
197 | mddev = NULL;}); \ | |
198 | ({ if (tmp != &all_mddevs) \ | |
199 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
200 | spin_unlock(&all_mddevs_lock); \ | |
201 | if (mddev) mddev_put(mddev); \ | |
202 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
203 | tmp != &all_mddevs;}); \ | |
204 | ({ spin_lock(&all_mddevs_lock); \ | |
205 | tmp = tmp->next;}) \ | |
206 | ) | |
207 | ||
208 | ||
409c57f3 N |
209 | /* Rather than calling directly into the personality make_request function, |
210 | * IO requests come here first so that we can check if the device is | |
211 | * being suspended pending a reconfiguration. | |
212 | * We hold a refcount over the call to ->make_request. By the time that | |
213 | * call has finished, the bio has been linked into some internal structure | |
214 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
215 | */ | |
216 | static int md_make_request(struct request_queue *q, struct bio *bio) | |
1da177e4 | 217 | { |
49077326 | 218 | const int rw = bio_data_dir(bio); |
409c57f3 N |
219 | mddev_t *mddev = q->queuedata; |
220 | int rv; | |
49077326 N |
221 | int cpu; |
222 | ||
409c57f3 N |
223 | if (mddev == NULL || mddev->pers == NULL) { |
224 | bio_io_error(bio); | |
225 | return 0; | |
226 | } | |
227 | rcu_read_lock(); | |
e9c7469b | 228 | if (mddev->suspended) { |
409c57f3 N |
229 | DEFINE_WAIT(__wait); |
230 | for (;;) { | |
231 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
232 | TASK_UNINTERRUPTIBLE); | |
e9c7469b | 233 | if (!mddev->suspended) |
409c57f3 N |
234 | break; |
235 | rcu_read_unlock(); | |
236 | schedule(); | |
237 | rcu_read_lock(); | |
238 | } | |
239 | finish_wait(&mddev->sb_wait, &__wait); | |
240 | } | |
241 | atomic_inc(&mddev->active_io); | |
242 | rcu_read_unlock(); | |
49077326 | 243 | |
21a52c6d | 244 | rv = mddev->pers->make_request(mddev, bio); |
49077326 N |
245 | |
246 | cpu = part_stat_lock(); | |
247 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); | |
248 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], | |
249 | bio_sectors(bio)); | |
250 | part_stat_unlock(); | |
251 | ||
409c57f3 N |
252 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
253 | wake_up(&mddev->sb_wait); | |
254 | ||
255 | return rv; | |
256 | } | |
257 | ||
9e35b99c N |
258 | /* mddev_suspend makes sure no new requests are submitted |
259 | * to the device, and that any requests that have been submitted | |
260 | * are completely handled. | |
261 | * Once ->stop is called and completes, the module will be completely | |
262 | * unused. | |
263 | */ | |
390ee602 | 264 | void mddev_suspend(mddev_t *mddev) |
409c57f3 N |
265 | { |
266 | BUG_ON(mddev->suspended); | |
267 | mddev->suspended = 1; | |
268 | synchronize_rcu(); | |
269 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
270 | mddev->pers->quiesce(mddev, 1); | |
409c57f3 | 271 | } |
390ee602 | 272 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 273 | |
390ee602 | 274 | void mddev_resume(mddev_t *mddev) |
409c57f3 N |
275 | { |
276 | mddev->suspended = 0; | |
277 | wake_up(&mddev->sb_wait); | |
278 | mddev->pers->quiesce(mddev, 0); | |
1da177e4 | 279 | } |
390ee602 | 280 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 281 | |
3fa841d7 N |
282 | int mddev_congested(mddev_t *mddev, int bits) |
283 | { | |
284 | return mddev->suspended; | |
285 | } | |
286 | EXPORT_SYMBOL(mddev_congested); | |
287 | ||
a2826aa9 | 288 | /* |
e9c7469b | 289 | * Generic flush handling for md |
a2826aa9 N |
290 | */ |
291 | ||
e9c7469b | 292 | static void md_end_flush(struct bio *bio, int err) |
a2826aa9 N |
293 | { |
294 | mdk_rdev_t *rdev = bio->bi_private; | |
295 | mddev_t *mddev = rdev->mddev; | |
a2826aa9 N |
296 | |
297 | rdev_dec_pending(rdev, mddev); | |
298 | ||
299 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b TH |
300 | /* The pre-request flush has finished */ |
301 | schedule_work(&mddev->flush_work); | |
a2826aa9 N |
302 | } |
303 | bio_put(bio); | |
304 | } | |
305 | ||
e9c7469b | 306 | static void submit_flushes(mddev_t *mddev) |
a2826aa9 N |
307 | { |
308 | mdk_rdev_t *rdev; | |
309 | ||
310 | rcu_read_lock(); | |
311 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
312 | if (rdev->raid_disk >= 0 && | |
313 | !test_bit(Faulty, &rdev->flags)) { | |
314 | /* Take two references, one is dropped | |
315 | * when request finishes, one after | |
316 | * we reclaim rcu_read_lock | |
317 | */ | |
318 | struct bio *bi; | |
319 | atomic_inc(&rdev->nr_pending); | |
320 | atomic_inc(&rdev->nr_pending); | |
321 | rcu_read_unlock(); | |
322 | bi = bio_alloc(GFP_KERNEL, 0); | |
e9c7469b | 323 | bi->bi_end_io = md_end_flush; |
a2826aa9 N |
324 | bi->bi_private = rdev; |
325 | bi->bi_bdev = rdev->bdev; | |
326 | atomic_inc(&mddev->flush_pending); | |
e9c7469b | 327 | submit_bio(WRITE_FLUSH, bi); |
a2826aa9 N |
328 | rcu_read_lock(); |
329 | rdev_dec_pending(rdev, mddev); | |
330 | } | |
331 | rcu_read_unlock(); | |
332 | } | |
333 | ||
e9c7469b | 334 | static void md_submit_flush_data(struct work_struct *ws) |
a2826aa9 | 335 | { |
e9c7469b TH |
336 | mddev_t *mddev = container_of(ws, mddev_t, flush_work); |
337 | struct bio *bio = mddev->flush_bio; | |
a2826aa9 N |
338 | |
339 | atomic_set(&mddev->flush_pending, 1); | |
340 | ||
e9c7469b | 341 | if (bio->bi_size == 0) |
a2826aa9 N |
342 | /* an empty barrier - all done */ |
343 | bio_endio(bio, 0); | |
344 | else { | |
e9c7469b | 345 | bio->bi_rw &= ~REQ_FLUSH; |
21a52c6d | 346 | if (mddev->pers->make_request(mddev, bio)) |
a2826aa9 | 347 | generic_make_request(bio); |
a2826aa9 N |
348 | } |
349 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b | 350 | mddev->flush_bio = NULL; |
a2826aa9 N |
351 | wake_up(&mddev->sb_wait); |
352 | } | |
353 | } | |
354 | ||
e9c7469b | 355 | void md_flush_request(mddev_t *mddev, struct bio *bio) |
a2826aa9 N |
356 | { |
357 | spin_lock_irq(&mddev->write_lock); | |
358 | wait_event_lock_irq(mddev->sb_wait, | |
e9c7469b | 359 | !mddev->flush_bio, |
a2826aa9 | 360 | mddev->write_lock, /*nothing*/); |
e9c7469b | 361 | mddev->flush_bio = bio; |
a2826aa9 N |
362 | spin_unlock_irq(&mddev->write_lock); |
363 | ||
364 | atomic_set(&mddev->flush_pending, 1); | |
e9c7469b | 365 | INIT_WORK(&mddev->flush_work, md_submit_flush_data); |
a2826aa9 | 366 | |
e9c7469b | 367 | submit_flushes(mddev); |
a2826aa9 N |
368 | |
369 | if (atomic_dec_and_test(&mddev->flush_pending)) | |
e9c7469b | 370 | schedule_work(&mddev->flush_work); |
a2826aa9 | 371 | } |
e9c7469b | 372 | EXPORT_SYMBOL(md_flush_request); |
409c57f3 | 373 | |
2ac87401 N |
374 | /* Support for plugging. |
375 | * This mirrors the plugging support in request_queue, but does not | |
376 | * require having a whole queue | |
377 | */ | |
378 | static void plugger_work(struct work_struct *work) | |
379 | { | |
380 | struct plug_handle *plug = | |
381 | container_of(work, struct plug_handle, unplug_work); | |
382 | plug->unplug_fn(plug); | |
383 | } | |
384 | static void plugger_timeout(unsigned long data) | |
385 | { | |
386 | struct plug_handle *plug = (void *)data; | |
387 | kblockd_schedule_work(NULL, &plug->unplug_work); | |
388 | } | |
389 | void plugger_init(struct plug_handle *plug, | |
390 | void (*unplug_fn)(struct plug_handle *)) | |
391 | { | |
392 | plug->unplug_flag = 0; | |
393 | plug->unplug_fn = unplug_fn; | |
394 | init_timer(&plug->unplug_timer); | |
395 | plug->unplug_timer.function = plugger_timeout; | |
396 | plug->unplug_timer.data = (unsigned long)plug; | |
397 | INIT_WORK(&plug->unplug_work, plugger_work); | |
398 | } | |
399 | EXPORT_SYMBOL_GPL(plugger_init); | |
400 | ||
401 | void plugger_set_plug(struct plug_handle *plug) | |
402 | { | |
403 | if (!test_and_set_bit(PLUGGED_FLAG, &plug->unplug_flag)) | |
404 | mod_timer(&plug->unplug_timer, jiffies + msecs_to_jiffies(3)+1); | |
405 | } | |
406 | EXPORT_SYMBOL_GPL(plugger_set_plug); | |
407 | ||
408 | int plugger_remove_plug(struct plug_handle *plug) | |
409 | { | |
410 | if (test_and_clear_bit(PLUGGED_FLAG, &plug->unplug_flag)) { | |
411 | del_timer(&plug->unplug_timer); | |
412 | return 1; | |
413 | } else | |
414 | return 0; | |
415 | } | |
416 | EXPORT_SYMBOL_GPL(plugger_remove_plug); | |
417 | ||
418 | ||
1da177e4 LT |
419 | static inline mddev_t *mddev_get(mddev_t *mddev) |
420 | { | |
421 | atomic_inc(&mddev->active); | |
422 | return mddev; | |
423 | } | |
424 | ||
5fd3a17e | 425 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 426 | |
1da177e4 LT |
427 | static void mddev_put(mddev_t *mddev) |
428 | { | |
429 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
430 | return; | |
d3374825 | 431 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
432 | mddev->ctime == 0 && !mddev->hold_active) { |
433 | /* Array is not configured at all, and not held active, | |
434 | * so destroy it */ | |
1da177e4 | 435 | list_del(&mddev->all_mddevs); |
d3374825 N |
436 | if (mddev->gendisk) { |
437 | /* we did a probe so need to clean up. | |
438 | * Call schedule_work inside the spinlock | |
439 | * so that flush_scheduled_work() after | |
440 | * mddev_find will succeed in waiting for the | |
441 | * work to be done. | |
442 | */ | |
443 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
444 | schedule_work(&mddev->del_work); | |
445 | } else | |
446 | kfree(mddev); | |
447 | } | |
448 | spin_unlock(&all_mddevs_lock); | |
1da177e4 LT |
449 | } |
450 | ||
390ee602 | 451 | void mddev_init(mddev_t *mddev) |
fafd7fb0 N |
452 | { |
453 | mutex_init(&mddev->open_mutex); | |
454 | mutex_init(&mddev->reconfig_mutex); | |
455 | mutex_init(&mddev->bitmap_info.mutex); | |
456 | INIT_LIST_HEAD(&mddev->disks); | |
457 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
458 | init_timer(&mddev->safemode_timer); | |
459 | atomic_set(&mddev->active, 1); | |
460 | atomic_set(&mddev->openers, 0); | |
461 | atomic_set(&mddev->active_io, 0); | |
462 | spin_lock_init(&mddev->write_lock); | |
463 | atomic_set(&mddev->flush_pending, 0); | |
464 | init_waitqueue_head(&mddev->sb_wait); | |
465 | init_waitqueue_head(&mddev->recovery_wait); | |
466 | mddev->reshape_position = MaxSector; | |
467 | mddev->resync_min = 0; | |
468 | mddev->resync_max = MaxSector; | |
469 | mddev->level = LEVEL_NONE; | |
470 | } | |
390ee602 | 471 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 472 | |
1da177e4 LT |
473 | static mddev_t * mddev_find(dev_t unit) |
474 | { | |
475 | mddev_t *mddev, *new = NULL; | |
476 | ||
477 | retry: | |
478 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
479 | |
480 | if (unit) { | |
481 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
482 | if (mddev->unit == unit) { | |
483 | mddev_get(mddev); | |
484 | spin_unlock(&all_mddevs_lock); | |
485 | kfree(new); | |
486 | return mddev; | |
487 | } | |
488 | ||
489 | if (new) { | |
490 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 491 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
492 | new->hold_active = UNTIL_IOCTL; |
493 | return new; | |
1da177e4 | 494 | } |
efeb53c0 N |
495 | } else if (new) { |
496 | /* find an unused unit number */ | |
497 | static int next_minor = 512; | |
498 | int start = next_minor; | |
499 | int is_free = 0; | |
500 | int dev = 0; | |
501 | while (!is_free) { | |
502 | dev = MKDEV(MD_MAJOR, next_minor); | |
503 | next_minor++; | |
504 | if (next_minor > MINORMASK) | |
505 | next_minor = 0; | |
506 | if (next_minor == start) { | |
507 | /* Oh dear, all in use. */ | |
508 | spin_unlock(&all_mddevs_lock); | |
509 | kfree(new); | |
510 | return NULL; | |
511 | } | |
512 | ||
513 | is_free = 1; | |
514 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
515 | if (mddev->unit == dev) { | |
516 | is_free = 0; | |
517 | break; | |
518 | } | |
519 | } | |
520 | new->unit = dev; | |
521 | new->md_minor = MINOR(dev); | |
522 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
523 | list_add(&new->all_mddevs, &all_mddevs); |
524 | spin_unlock(&all_mddevs_lock); | |
525 | return new; | |
526 | } | |
527 | spin_unlock(&all_mddevs_lock); | |
528 | ||
9ffae0cf | 529 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
530 | if (!new) |
531 | return NULL; | |
532 | ||
1da177e4 LT |
533 | new->unit = unit; |
534 | if (MAJOR(unit) == MD_MAJOR) | |
535 | new->md_minor = MINOR(unit); | |
536 | else | |
537 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
538 | ||
fafd7fb0 | 539 | mddev_init(new); |
1da177e4 | 540 | |
1da177e4 LT |
541 | goto retry; |
542 | } | |
543 | ||
544 | static inline int mddev_lock(mddev_t * mddev) | |
545 | { | |
df5b89b3 | 546 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
547 | } |
548 | ||
b522adcd DW |
549 | static inline int mddev_is_locked(mddev_t *mddev) |
550 | { | |
551 | return mutex_is_locked(&mddev->reconfig_mutex); | |
552 | } | |
553 | ||
1da177e4 LT |
554 | static inline int mddev_trylock(mddev_t * mddev) |
555 | { | |
df5b89b3 | 556 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
557 | } |
558 | ||
b6eb127d N |
559 | static struct attribute_group md_redundancy_group; |
560 | ||
a64c876f | 561 | static void mddev_unlock(mddev_t * mddev) |
1da177e4 | 562 | { |
a64c876f | 563 | if (mddev->to_remove) { |
b6eb127d N |
564 | /* These cannot be removed under reconfig_mutex as |
565 | * an access to the files will try to take reconfig_mutex | |
566 | * while holding the file unremovable, which leads to | |
567 | * a deadlock. | |
bb4f1e9d N |
568 | * So hold set sysfs_active while the remove in happeing, |
569 | * and anything else which might set ->to_remove or my | |
570 | * otherwise change the sysfs namespace will fail with | |
571 | * -EBUSY if sysfs_active is still set. | |
572 | * We set sysfs_active under reconfig_mutex and elsewhere | |
573 | * test it under the same mutex to ensure its correct value | |
574 | * is seen. | |
b6eb127d | 575 | */ |
a64c876f N |
576 | struct attribute_group *to_remove = mddev->to_remove; |
577 | mddev->to_remove = NULL; | |
bb4f1e9d | 578 | mddev->sysfs_active = 1; |
b6eb127d N |
579 | mutex_unlock(&mddev->reconfig_mutex); |
580 | ||
00bcb4ac N |
581 | if (mddev->kobj.sd) { |
582 | if (to_remove != &md_redundancy_group) | |
583 | sysfs_remove_group(&mddev->kobj, to_remove); | |
584 | if (mddev->pers == NULL || | |
585 | mddev->pers->sync_request == NULL) { | |
586 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
587 | if (mddev->sysfs_action) | |
588 | sysfs_put(mddev->sysfs_action); | |
589 | mddev->sysfs_action = NULL; | |
590 | } | |
a64c876f | 591 | } |
bb4f1e9d | 592 | mddev->sysfs_active = 0; |
b6eb127d N |
593 | } else |
594 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 595 | |
005eca5e | 596 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
597 | } |
598 | ||
2989ddbd | 599 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 | 600 | { |
159ec1fc | 601 | mdk_rdev_t *rdev; |
1da177e4 | 602 | |
159ec1fc | 603 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
604 | if (rdev->desc_nr == nr) |
605 | return rdev; | |
159ec1fc | 606 | |
1da177e4 LT |
607 | return NULL; |
608 | } | |
609 | ||
610 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
611 | { | |
1da177e4 LT |
612 | mdk_rdev_t *rdev; |
613 | ||
159ec1fc | 614 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
615 | if (rdev->bdev->bd_dev == dev) |
616 | return rdev; | |
159ec1fc | 617 | |
1da177e4 LT |
618 | return NULL; |
619 | } | |
620 | ||
d9d166c2 | 621 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
622 | { |
623 | struct mdk_personality *pers; | |
d9d166c2 N |
624 | list_for_each_entry(pers, &pers_list, list) { |
625 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 626 | return pers; |
d9d166c2 N |
627 | if (strcmp(pers->name, clevel)==0) |
628 | return pers; | |
629 | } | |
2604b703 N |
630 | return NULL; |
631 | } | |
632 | ||
b73df2d3 | 633 | /* return the offset of the super block in 512byte sectors */ |
77933d72 | 634 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 | 635 | { |
b73df2d3 AN |
636 | sector_t num_sectors = bdev->bd_inode->i_size / 512; |
637 | return MD_NEW_SIZE_SECTORS(num_sectors); | |
1da177e4 LT |
638 | } |
639 | ||
1da177e4 LT |
640 | static int alloc_disk_sb(mdk_rdev_t * rdev) |
641 | { | |
642 | if (rdev->sb_page) | |
643 | MD_BUG(); | |
644 | ||
645 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
646 | if (!rdev->sb_page) { | |
647 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 648 | return -ENOMEM; |
1da177e4 LT |
649 | } |
650 | ||
651 | return 0; | |
652 | } | |
653 | ||
654 | static void free_disk_sb(mdk_rdev_t * rdev) | |
655 | { | |
656 | if (rdev->sb_page) { | |
2d1f3b5d | 657 | put_page(rdev->sb_page); |
1da177e4 LT |
658 | rdev->sb_loaded = 0; |
659 | rdev->sb_page = NULL; | |
0f420358 | 660 | rdev->sb_start = 0; |
dd8ac336 | 661 | rdev->sectors = 0; |
1da177e4 LT |
662 | } |
663 | } | |
664 | ||
665 | ||
6712ecf8 | 666 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
667 | { |
668 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 669 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 670 | |
3a0f5bbb N |
671 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
672 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
673 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
674 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 675 | md_error(mddev, rdev); |
3a0f5bbb | 676 | } |
7bfa19f2 | 677 | |
a9701a30 N |
678 | if (atomic_dec_and_test(&mddev->pending_writes)) |
679 | wake_up(&mddev->sb_wait); | |
f8b58edf | 680 | bio_put(bio); |
7bfa19f2 N |
681 | } |
682 | ||
683 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, | |
684 | sector_t sector, int size, struct page *page) | |
685 | { | |
686 | /* write first size bytes of page to sector of rdev | |
687 | * Increment mddev->pending_writes before returning | |
688 | * and decrement it on completion, waking up sb_wait | |
689 | * if zero is reached. | |
690 | * If an error occurred, call md_error | |
691 | */ | |
692 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
693 | ||
694 | bio->bi_bdev = rdev->bdev; | |
695 | bio->bi_sector = sector; | |
696 | bio_add_page(bio, page, size, 0); | |
697 | bio->bi_private = rdev; | |
698 | bio->bi_end_io = super_written; | |
a9701a30 | 699 | |
7bfa19f2 | 700 | atomic_inc(&mddev->pending_writes); |
e9c7469b TH |
701 | submit_bio(REQ_WRITE | REQ_SYNC | REQ_UNPLUG | REQ_FLUSH | REQ_FUA, |
702 | bio); | |
a9701a30 N |
703 | } |
704 | ||
705 | void md_super_wait(mddev_t *mddev) | |
706 | { | |
e9c7469b | 707 | /* wait for all superblock writes that were scheduled to complete */ |
a9701a30 N |
708 | DEFINE_WAIT(wq); |
709 | for(;;) { | |
710 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
711 | if (atomic_read(&mddev->pending_writes)==0) | |
712 | break; | |
a9701a30 N |
713 | schedule(); |
714 | } | |
715 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
716 | } |
717 | ||
6712ecf8 | 718 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 719 | { |
1da177e4 | 720 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
721 | } |
722 | ||
a654b9d8 | 723 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
724 | struct page *page, int rw) |
725 | { | |
baaa2c51 | 726 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
727 | struct completion event; |
728 | int ret; | |
729 | ||
7b6d91da | 730 | rw |= REQ_SYNC | REQ_UNPLUG; |
1da177e4 LT |
731 | |
732 | bio->bi_bdev = bdev; | |
733 | bio->bi_sector = sector; | |
734 | bio_add_page(bio, page, size, 0); | |
735 | init_completion(&event); | |
736 | bio->bi_private = &event; | |
737 | bio->bi_end_io = bi_complete; | |
738 | submit_bio(rw, bio); | |
739 | wait_for_completion(&event); | |
740 | ||
741 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
742 | bio_put(bio); | |
743 | return ret; | |
744 | } | |
a8745db2 | 745 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 746 | |
0002b271 | 747 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
748 | { |
749 | char b[BDEVNAME_SIZE]; | |
750 | if (!rdev->sb_page) { | |
751 | MD_BUG(); | |
752 | return -EINVAL; | |
753 | } | |
754 | if (rdev->sb_loaded) | |
755 | return 0; | |
756 | ||
757 | ||
0f420358 | 758 | if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ)) |
1da177e4 LT |
759 | goto fail; |
760 | rdev->sb_loaded = 1; | |
761 | return 0; | |
762 | ||
763 | fail: | |
764 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
765 | bdevname(rdev->bdev,b)); | |
766 | return -EINVAL; | |
767 | } | |
768 | ||
769 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
770 | { | |
05710466 AN |
771 | return sb1->set_uuid0 == sb2->set_uuid0 && |
772 | sb1->set_uuid1 == sb2->set_uuid1 && | |
773 | sb1->set_uuid2 == sb2->set_uuid2 && | |
774 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
775 | } |
776 | ||
1da177e4 LT |
777 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
778 | { | |
779 | int ret; | |
780 | mdp_super_t *tmp1, *tmp2; | |
781 | ||
782 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
783 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
784 | ||
785 | if (!tmp1 || !tmp2) { | |
786 | ret = 0; | |
35020f1a | 787 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
788 | goto abort; |
789 | } | |
790 | ||
791 | *tmp1 = *sb1; | |
792 | *tmp2 = *sb2; | |
793 | ||
794 | /* | |
795 | * nr_disks is not constant | |
796 | */ | |
797 | tmp1->nr_disks = 0; | |
798 | tmp2->nr_disks = 0; | |
799 | ||
ce0c8e05 | 800 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 801 | abort: |
990a8baf JJ |
802 | kfree(tmp1); |
803 | kfree(tmp2); | |
1da177e4 LT |
804 | return ret; |
805 | } | |
806 | ||
4d167f09 N |
807 | |
808 | static u32 md_csum_fold(u32 csum) | |
809 | { | |
810 | csum = (csum & 0xffff) + (csum >> 16); | |
811 | return (csum & 0xffff) + (csum >> 16); | |
812 | } | |
813 | ||
1da177e4 LT |
814 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
815 | { | |
4d167f09 N |
816 | u64 newcsum = 0; |
817 | u32 *sb32 = (u32*)sb; | |
818 | int i; | |
1da177e4 LT |
819 | unsigned int disk_csum, csum; |
820 | ||
821 | disk_csum = sb->sb_csum; | |
822 | sb->sb_csum = 0; | |
4d167f09 N |
823 | |
824 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
825 | newcsum += sb32[i]; | |
826 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
827 | ||
828 | ||
829 | #ifdef CONFIG_ALPHA | |
830 | /* This used to use csum_partial, which was wrong for several | |
831 | * reasons including that different results are returned on | |
832 | * different architectures. It isn't critical that we get exactly | |
833 | * the same return value as before (we always csum_fold before | |
834 | * testing, and that removes any differences). However as we | |
835 | * know that csum_partial always returned a 16bit value on | |
836 | * alphas, do a fold to maximise conformity to previous behaviour. | |
837 | */ | |
838 | sb->sb_csum = md_csum_fold(disk_csum); | |
839 | #else | |
1da177e4 | 840 | sb->sb_csum = disk_csum; |
4d167f09 | 841 | #endif |
1da177e4 LT |
842 | return csum; |
843 | } | |
844 | ||
845 | ||
846 | /* | |
847 | * Handle superblock details. | |
848 | * We want to be able to handle multiple superblock formats | |
849 | * so we have a common interface to them all, and an array of | |
850 | * different handlers. | |
851 | * We rely on user-space to write the initial superblock, and support | |
852 | * reading and updating of superblocks. | |
853 | * Interface methods are: | |
854 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
855 | * loads and validates a superblock on dev. | |
856 | * if refdev != NULL, compare superblocks on both devices | |
857 | * Return: | |
858 | * 0 - dev has a superblock that is compatible with refdev | |
859 | * 1 - dev has a superblock that is compatible and newer than refdev | |
860 | * so dev should be used as the refdev in future | |
861 | * -EINVAL superblock incompatible or invalid | |
862 | * -othererror e.g. -EIO | |
863 | * | |
864 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
865 | * Verify that dev is acceptable into mddev. | |
866 | * The first time, mddev->raid_disks will be 0, and data from | |
867 | * dev should be merged in. Subsequent calls check that dev | |
868 | * is new enough. Return 0 or -EINVAL | |
869 | * | |
870 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
871 | * Update the superblock for rdev with data in mddev | |
872 | * This does not write to disc. | |
873 | * | |
874 | */ | |
875 | ||
876 | struct super_type { | |
0cd17fec CW |
877 | char *name; |
878 | struct module *owner; | |
879 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
880 | int minor_version); | |
881 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
882 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
883 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
15f4a5fd | 884 | sector_t num_sectors); |
1da177e4 LT |
885 | }; |
886 | ||
0894cc30 AN |
887 | /* |
888 | * Check that the given mddev has no bitmap. | |
889 | * | |
890 | * This function is called from the run method of all personalities that do not | |
891 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
892 | * has a bitmap. Otherwise, it returns 0. | |
893 | * | |
894 | */ | |
895 | int md_check_no_bitmap(mddev_t *mddev) | |
896 | { | |
c3d9714e | 897 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
898 | return 0; |
899 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
900 | mdname(mddev), mddev->pers->name); | |
901 | return 1; | |
902 | } | |
903 | EXPORT_SYMBOL(md_check_no_bitmap); | |
904 | ||
1da177e4 LT |
905 | /* |
906 | * load_super for 0.90.0 | |
907 | */ | |
908 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
909 | { | |
910 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
911 | mdp_super_t *sb; | |
912 | int ret; | |
1da177e4 LT |
913 | |
914 | /* | |
0f420358 | 915 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
916 | * it's at the end of the disk. |
917 | * | |
918 | * It also happens to be a multiple of 4Kb. | |
919 | */ | |
0f420358 | 920 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 921 | |
0002b271 | 922 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
923 | if (ret) return ret; |
924 | ||
925 | ret = -EINVAL; | |
926 | ||
927 | bdevname(rdev->bdev, b); | |
928 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
929 | ||
930 | if (sb->md_magic != MD_SB_MAGIC) { | |
931 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
932 | b); | |
933 | goto abort; | |
934 | } | |
935 | ||
936 | if (sb->major_version != 0 || | |
f6705578 N |
937 | sb->minor_version < 90 || |
938 | sb->minor_version > 91) { | |
1da177e4 LT |
939 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
940 | sb->major_version, sb->minor_version, | |
941 | b); | |
942 | goto abort; | |
943 | } | |
944 | ||
945 | if (sb->raid_disks <= 0) | |
946 | goto abort; | |
947 | ||
4d167f09 | 948 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
949 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
950 | b); | |
951 | goto abort; | |
952 | } | |
953 | ||
954 | rdev->preferred_minor = sb->md_minor; | |
955 | rdev->data_offset = 0; | |
0002b271 | 956 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 LT |
957 | |
958 | if (sb->level == LEVEL_MULTIPATH) | |
959 | rdev->desc_nr = -1; | |
960 | else | |
961 | rdev->desc_nr = sb->this_disk.number; | |
962 | ||
9a7b2b0f | 963 | if (!refdev) { |
1da177e4 | 964 | ret = 1; |
9a7b2b0f | 965 | } else { |
1da177e4 LT |
966 | __u64 ev1, ev2; |
967 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
968 | if (!uuid_equal(refsb, sb)) { | |
969 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
970 | b, bdevname(refdev->bdev,b2)); | |
971 | goto abort; | |
972 | } | |
973 | if (!sb_equal(refsb, sb)) { | |
974 | printk(KERN_WARNING "md: %s has same UUID" | |
975 | " but different superblock to %s\n", | |
976 | b, bdevname(refdev->bdev, b2)); | |
977 | goto abort; | |
978 | } | |
979 | ev1 = md_event(sb); | |
980 | ev2 = md_event(refsb); | |
981 | if (ev1 > ev2) | |
982 | ret = 1; | |
983 | else | |
984 | ret = 0; | |
985 | } | |
8190e754 | 986 | rdev->sectors = rdev->sb_start; |
1da177e4 | 987 | |
dd8ac336 | 988 | if (rdev->sectors < sb->size * 2 && sb->level > 1) |
2bf071bf N |
989 | /* "this cannot possibly happen" ... */ |
990 | ret = -EINVAL; | |
991 | ||
1da177e4 LT |
992 | abort: |
993 | return ret; | |
994 | } | |
995 | ||
996 | /* | |
997 | * validate_super for 0.90.0 | |
998 | */ | |
999 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1000 | { | |
1001 | mdp_disk_t *desc; | |
1002 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 1003 | __u64 ev1 = md_event(sb); |
1da177e4 | 1004 | |
41158c7e | 1005 | rdev->raid_disk = -1; |
c5d79adb N |
1006 | clear_bit(Faulty, &rdev->flags); |
1007 | clear_bit(In_sync, &rdev->flags); | |
1008 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1009 | |
1da177e4 LT |
1010 | if (mddev->raid_disks == 0) { |
1011 | mddev->major_version = 0; | |
1012 | mddev->minor_version = sb->minor_version; | |
1013 | mddev->patch_version = sb->patch_version; | |
e691063a | 1014 | mddev->external = 0; |
9d8f0363 | 1015 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1016 | mddev->ctime = sb->ctime; |
1017 | mddev->utime = sb->utime; | |
1018 | mddev->level = sb->level; | |
d9d166c2 | 1019 | mddev->clevel[0] = 0; |
1da177e4 LT |
1020 | mddev->layout = sb->layout; |
1021 | mddev->raid_disks = sb->raid_disks; | |
58c0fed4 | 1022 | mddev->dev_sectors = sb->size * 2; |
07d84d10 | 1023 | mddev->events = ev1; |
c3d9714e N |
1024 | mddev->bitmap_info.offset = 0; |
1025 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; | |
1da177e4 | 1026 | |
f6705578 N |
1027 | if (mddev->minor_version >= 91) { |
1028 | mddev->reshape_position = sb->reshape_position; | |
1029 | mddev->delta_disks = sb->delta_disks; | |
1030 | mddev->new_level = sb->new_level; | |
1031 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1032 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
f6705578 N |
1033 | } else { |
1034 | mddev->reshape_position = MaxSector; | |
1035 | mddev->delta_disks = 0; | |
1036 | mddev->new_level = mddev->level; | |
1037 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1038 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1039 | } |
1040 | ||
1da177e4 LT |
1041 | if (sb->state & (1<<MD_SB_CLEAN)) |
1042 | mddev->recovery_cp = MaxSector; | |
1043 | else { | |
1044 | if (sb->events_hi == sb->cp_events_hi && | |
1045 | sb->events_lo == sb->cp_events_lo) { | |
1046 | mddev->recovery_cp = sb->recovery_cp; | |
1047 | } else | |
1048 | mddev->recovery_cp = 0; | |
1049 | } | |
1050 | ||
1051 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1052 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1053 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1054 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1055 | ||
1056 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1057 | |
1058 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
c3d9714e N |
1059 | mddev->bitmap_info.file == NULL) |
1060 | mddev->bitmap_info.offset = | |
1061 | mddev->bitmap_info.default_offset; | |
a654b9d8 | 1062 | |
41158c7e | 1063 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1064 | /* Insist on good event counter while assembling, except |
1065 | * for spares (which don't need an event count) */ | |
1da177e4 | 1066 | ++ev1; |
be6800a7 N |
1067 | if (sb->disks[rdev->desc_nr].state & ( |
1068 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
1069 | if (ev1 < mddev->events) | |
1070 | return -EINVAL; | |
41158c7e N |
1071 | } else if (mddev->bitmap) { |
1072 | /* if adding to array with a bitmap, then we can accept an | |
1073 | * older device ... but not too old. | |
1074 | */ | |
41158c7e N |
1075 | if (ev1 < mddev->bitmap->events_cleared) |
1076 | return 0; | |
07d84d10 N |
1077 | } else { |
1078 | if (ev1 < mddev->events) | |
1079 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1080 | return 0; | |
1081 | } | |
41158c7e | 1082 | |
1da177e4 | 1083 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1084 | desc = sb->disks + rdev->desc_nr; |
1085 | ||
1086 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1087 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1088 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1089 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1090 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1091 | rdev->raid_disk = desc->raid_disk; |
0261cd9f N |
1092 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1093 | /* active but not in sync implies recovery up to | |
1094 | * reshape position. We don't know exactly where | |
1095 | * that is, so set to zero for now */ | |
1096 | if (mddev->minor_version >= 91) { | |
1097 | rdev->recovery_offset = 0; | |
1098 | rdev->raid_disk = desc->raid_disk; | |
1099 | } | |
1da177e4 | 1100 | } |
8ddf9efe N |
1101 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1102 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1103 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1104 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1105 | return 0; |
1106 | } | |
1107 | ||
1108 | /* | |
1109 | * sync_super for 0.90.0 | |
1110 | */ | |
1111 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1112 | { | |
1113 | mdp_super_t *sb; | |
1da177e4 LT |
1114 | mdk_rdev_t *rdev2; |
1115 | int next_spare = mddev->raid_disks; | |
19133a42 | 1116 | |
1da177e4 LT |
1117 | |
1118 | /* make rdev->sb match mddev data.. | |
1119 | * | |
1120 | * 1/ zero out disks | |
1121 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1122 | * 3/ any empty disks < next_spare become removed | |
1123 | * | |
1124 | * disks[0] gets initialised to REMOVED because | |
1125 | * we cannot be sure from other fields if it has | |
1126 | * been initialised or not. | |
1127 | */ | |
1128 | int i; | |
1129 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1130 | ||
61181565 N |
1131 | rdev->sb_size = MD_SB_BYTES; |
1132 | ||
1da177e4 LT |
1133 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
1134 | ||
1135 | memset(sb, 0, sizeof(*sb)); | |
1136 | ||
1137 | sb->md_magic = MD_SB_MAGIC; | |
1138 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1139 | sb->patch_version = mddev->patch_version; |
1140 | sb->gvalid_words = 0; /* ignored */ | |
1141 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1142 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1143 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1144 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1145 | ||
1146 | sb->ctime = mddev->ctime; | |
1147 | sb->level = mddev->level; | |
58c0fed4 | 1148 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1149 | sb->raid_disks = mddev->raid_disks; |
1150 | sb->md_minor = mddev->md_minor; | |
e691063a | 1151 | sb->not_persistent = 0; |
1da177e4 LT |
1152 | sb->utime = mddev->utime; |
1153 | sb->state = 0; | |
1154 | sb->events_hi = (mddev->events>>32); | |
1155 | sb->events_lo = (u32)mddev->events; | |
1156 | ||
f6705578 N |
1157 | if (mddev->reshape_position == MaxSector) |
1158 | sb->minor_version = 90; | |
1159 | else { | |
1160 | sb->minor_version = 91; | |
1161 | sb->reshape_position = mddev->reshape_position; | |
1162 | sb->new_level = mddev->new_level; | |
1163 | sb->delta_disks = mddev->delta_disks; | |
1164 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1165 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1166 | } |
1167 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1168 | if (mddev->in_sync) |
1169 | { | |
1170 | sb->recovery_cp = mddev->recovery_cp; | |
1171 | sb->cp_events_hi = (mddev->events>>32); | |
1172 | sb->cp_events_lo = (u32)mddev->events; | |
1173 | if (mddev->recovery_cp == MaxSector) | |
1174 | sb->state = (1<< MD_SB_CLEAN); | |
1175 | } else | |
1176 | sb->recovery_cp = 0; | |
1177 | ||
1178 | sb->layout = mddev->layout; | |
9d8f0363 | 1179 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1180 | |
c3d9714e | 1181 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1182 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1183 | ||
1da177e4 | 1184 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
159ec1fc | 1185 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1186 | mdp_disk_t *d; |
86e6ffdd | 1187 | int desc_nr; |
0261cd9f N |
1188 | int is_active = test_bit(In_sync, &rdev2->flags); |
1189 | ||
1190 | if (rdev2->raid_disk >= 0 && | |
1191 | sb->minor_version >= 91) | |
1192 | /* we have nowhere to store the recovery_offset, | |
1193 | * but if it is not below the reshape_position, | |
1194 | * we can piggy-back on that. | |
1195 | */ | |
1196 | is_active = 1; | |
1197 | if (rdev2->raid_disk < 0 || | |
1198 | test_bit(Faulty, &rdev2->flags)) | |
1199 | is_active = 0; | |
1200 | if (is_active) | |
86e6ffdd | 1201 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1202 | else |
86e6ffdd | 1203 | desc_nr = next_spare++; |
19133a42 | 1204 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1205 | d = &sb->disks[rdev2->desc_nr]; |
1206 | nr_disks++; | |
1207 | d->number = rdev2->desc_nr; | |
1208 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1209 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1210 | if (is_active) |
1da177e4 LT |
1211 | d->raid_disk = rdev2->raid_disk; |
1212 | else | |
1213 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1214 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1215 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1216 | else if (is_active) { |
1da177e4 | 1217 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1218 | if (test_bit(In_sync, &rdev2->flags)) |
1219 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1220 | active++; |
1221 | working++; | |
1222 | } else { | |
1223 | d->state = 0; | |
1224 | spare++; | |
1225 | working++; | |
1226 | } | |
8ddf9efe N |
1227 | if (test_bit(WriteMostly, &rdev2->flags)) |
1228 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1229 | } |
1da177e4 LT |
1230 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1231 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1232 | mdp_disk_t *d = &sb->disks[i]; | |
1233 | if (d->state == 0 && d->number == 0) { | |
1234 | d->number = i; | |
1235 | d->raid_disk = i; | |
1236 | d->state = (1<<MD_DISK_REMOVED); | |
1237 | d->state |= (1<<MD_DISK_FAULTY); | |
1238 | failed++; | |
1239 | } | |
1240 | } | |
1241 | sb->nr_disks = nr_disks; | |
1242 | sb->active_disks = active; | |
1243 | sb->working_disks = working; | |
1244 | sb->failed_disks = failed; | |
1245 | sb->spare_disks = spare; | |
1246 | ||
1247 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1248 | sb->sb_csum = calc_sb_csum(sb); | |
1249 | } | |
1250 | ||
0cd17fec CW |
1251 | /* |
1252 | * rdev_size_change for 0.90.0 | |
1253 | */ | |
1254 | static unsigned long long | |
15f4a5fd | 1255 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec | 1256 | { |
58c0fed4 | 1257 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1258 | return 0; /* component must fit device */ |
c3d9714e | 1259 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1260 | return 0; /* can't move bitmap */ |
0f420358 | 1261 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
15f4a5fd AN |
1262 | if (!num_sectors || num_sectors > rdev->sb_start) |
1263 | num_sectors = rdev->sb_start; | |
0f420358 | 1264 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1265 | rdev->sb_page); |
1266 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1267 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec CW |
1268 | } |
1269 | ||
1270 | ||
1da177e4 LT |
1271 | /* |
1272 | * version 1 superblock | |
1273 | */ | |
1274 | ||
1c05b4bc | 1275 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1276 | { |
1c05b4bc N |
1277 | __le32 disk_csum; |
1278 | u32 csum; | |
1da177e4 LT |
1279 | unsigned long long newcsum; |
1280 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1281 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1282 | int i; |
1283 | ||
1284 | disk_csum = sb->sb_csum; | |
1285 | sb->sb_csum = 0; | |
1286 | newcsum = 0; | |
1287 | for (i=0; size>=4; size -= 4 ) | |
1288 | newcsum += le32_to_cpu(*isuper++); | |
1289 | ||
1290 | if (size == 2) | |
1c05b4bc | 1291 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1292 | |
1293 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1294 | sb->sb_csum = disk_csum; | |
1295 | return cpu_to_le32(csum); | |
1296 | } | |
1297 | ||
1298 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1299 | { | |
1300 | struct mdp_superblock_1 *sb; | |
1301 | int ret; | |
0f420358 | 1302 | sector_t sb_start; |
1da177e4 | 1303 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1304 | int bmask; |
1da177e4 LT |
1305 | |
1306 | /* | |
0f420358 | 1307 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1308 | * It is always aligned to a 4K boundary and |
1309 | * depeding on minor_version, it can be: | |
1310 | * 0: At least 8K, but less than 12K, from end of device | |
1311 | * 1: At start of device | |
1312 | * 2: 4K from start of device. | |
1313 | */ | |
1314 | switch(minor_version) { | |
1315 | case 0: | |
0f420358 AN |
1316 | sb_start = rdev->bdev->bd_inode->i_size >> 9; |
1317 | sb_start -= 8*2; | |
1318 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1319 | break; |
1320 | case 1: | |
0f420358 | 1321 | sb_start = 0; |
1da177e4 LT |
1322 | break; |
1323 | case 2: | |
0f420358 | 1324 | sb_start = 8; |
1da177e4 LT |
1325 | break; |
1326 | default: | |
1327 | return -EINVAL; | |
1328 | } | |
0f420358 | 1329 | rdev->sb_start = sb_start; |
1da177e4 | 1330 | |
0002b271 N |
1331 | /* superblock is rarely larger than 1K, but it can be larger, |
1332 | * and it is safe to read 4k, so we do that | |
1333 | */ | |
1334 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1335 | if (ret) return ret; |
1336 | ||
1337 | ||
1338 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1339 | ||
1340 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1341 | sb->major_version != cpu_to_le32(1) || | |
1342 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1343 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1344 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1345 | return -EINVAL; |
1346 | ||
1347 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1348 | printk("md: invalid superblock checksum on %s\n", | |
1349 | bdevname(rdev->bdev,b)); | |
1350 | return -EINVAL; | |
1351 | } | |
1352 | if (le64_to_cpu(sb->data_size) < 10) { | |
1353 | printk("md: data_size too small on %s\n", | |
1354 | bdevname(rdev->bdev,b)); | |
1355 | return -EINVAL; | |
1356 | } | |
e11e93fa | 1357 | |
1da177e4 LT |
1358 | rdev->preferred_minor = 0xffff; |
1359 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1360 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1361 | |
0002b271 | 1362 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1363 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1364 | if (rdev->sb_size & bmask) |
a1801f85 N |
1365 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1366 | ||
1367 | if (minor_version | |
0f420358 | 1368 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1369 | return -EINVAL; |
0002b271 | 1370 | |
31b65a0d N |
1371 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1372 | rdev->desc_nr = -1; | |
1373 | else | |
1374 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1375 | ||
9a7b2b0f | 1376 | if (!refdev) { |
8ed75463 | 1377 | ret = 1; |
9a7b2b0f | 1378 | } else { |
1da177e4 LT |
1379 | __u64 ev1, ev2; |
1380 | struct mdp_superblock_1 *refsb = | |
1381 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1382 | ||
1383 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1384 | sb->level != refsb->level || | |
1385 | sb->layout != refsb->layout || | |
1386 | sb->chunksize != refsb->chunksize) { | |
1387 | printk(KERN_WARNING "md: %s has strangely different" | |
1388 | " superblock to %s\n", | |
1389 | bdevname(rdev->bdev,b), | |
1390 | bdevname(refdev->bdev,b2)); | |
1391 | return -EINVAL; | |
1392 | } | |
1393 | ev1 = le64_to_cpu(sb->events); | |
1394 | ev2 = le64_to_cpu(refsb->events); | |
1395 | ||
1396 | if (ev1 > ev2) | |
8ed75463 N |
1397 | ret = 1; |
1398 | else | |
1399 | ret = 0; | |
1da177e4 | 1400 | } |
a1801f85 | 1401 | if (minor_version) |
dd8ac336 AN |
1402 | rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) - |
1403 | le64_to_cpu(sb->data_offset); | |
1da177e4 | 1404 | else |
dd8ac336 AN |
1405 | rdev->sectors = rdev->sb_start; |
1406 | if (rdev->sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1407 | return -EINVAL; |
dd8ac336 | 1408 | rdev->sectors = le64_to_cpu(sb->data_size); |
dd8ac336 | 1409 | if (le64_to_cpu(sb->size) > rdev->sectors) |
2bf071bf | 1410 | return -EINVAL; |
8ed75463 | 1411 | return ret; |
1da177e4 LT |
1412 | } |
1413 | ||
1414 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1415 | { | |
1416 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1417 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1418 | |
41158c7e | 1419 | rdev->raid_disk = -1; |
c5d79adb N |
1420 | clear_bit(Faulty, &rdev->flags); |
1421 | clear_bit(In_sync, &rdev->flags); | |
1422 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1423 | |
1da177e4 LT |
1424 | if (mddev->raid_disks == 0) { |
1425 | mddev->major_version = 1; | |
1426 | mddev->patch_version = 0; | |
e691063a | 1427 | mddev->external = 0; |
9d8f0363 | 1428 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1429 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1430 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1431 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1432 | mddev->clevel[0] = 0; |
1da177e4 LT |
1433 | mddev->layout = le32_to_cpu(sb->layout); |
1434 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1435 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1436 | mddev->events = ev1; |
c3d9714e N |
1437 | mddev->bitmap_info.offset = 0; |
1438 | mddev->bitmap_info.default_offset = 1024 >> 9; | |
1da177e4 LT |
1439 | |
1440 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1441 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1442 | ||
1443 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1444 | |
71c0805c | 1445 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
c3d9714e N |
1446 | mddev->bitmap_info.file == NULL ) |
1447 | mddev->bitmap_info.offset = | |
1448 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
e11e93fa | 1449 | |
f6705578 N |
1450 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1451 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1452 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1453 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1454 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1455 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
f6705578 N |
1456 | } else { |
1457 | mddev->reshape_position = MaxSector; | |
1458 | mddev->delta_disks = 0; | |
1459 | mddev->new_level = mddev->level; | |
1460 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1461 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1462 | } |
1463 | ||
41158c7e | 1464 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1465 | /* Insist of good event counter while assembling, except for |
1466 | * spares (which don't need an event count) */ | |
1da177e4 | 1467 | ++ev1; |
be6800a7 N |
1468 | if (rdev->desc_nr >= 0 && |
1469 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
1470 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) | |
1471 | if (ev1 < mddev->events) | |
1472 | return -EINVAL; | |
41158c7e N |
1473 | } else if (mddev->bitmap) { |
1474 | /* If adding to array with a bitmap, then we can accept an | |
1475 | * older device, but not too old. | |
1476 | */ | |
41158c7e N |
1477 | if (ev1 < mddev->bitmap->events_cleared) |
1478 | return 0; | |
07d84d10 N |
1479 | } else { |
1480 | if (ev1 < mddev->events) | |
1481 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1482 | return 0; | |
1483 | } | |
1da177e4 LT |
1484 | if (mddev->level != LEVEL_MULTIPATH) { |
1485 | int role; | |
3673f305 N |
1486 | if (rdev->desc_nr < 0 || |
1487 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1488 | role = 0xffff; | |
1489 | rdev->desc_nr = -1; | |
1490 | } else | |
1491 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1492 | switch(role) { |
1493 | case 0xffff: /* spare */ | |
1da177e4 LT |
1494 | break; |
1495 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1496 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1497 | break; |
1498 | default: | |
5fd6c1dc N |
1499 | if ((le32_to_cpu(sb->feature_map) & |
1500 | MD_FEATURE_RECOVERY_OFFSET)) | |
1501 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1502 | else | |
1503 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1504 | rdev->raid_disk = role; |
1505 | break; | |
1506 | } | |
8ddf9efe N |
1507 | if (sb->devflags & WriteMostly1) |
1508 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1509 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1510 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1511 | |
1da177e4 LT |
1512 | return 0; |
1513 | } | |
1514 | ||
1515 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1516 | { | |
1517 | struct mdp_superblock_1 *sb; | |
1da177e4 LT |
1518 | mdk_rdev_t *rdev2; |
1519 | int max_dev, i; | |
1520 | /* make rdev->sb match mddev and rdev data. */ | |
1521 | ||
1522 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1523 | ||
1524 | sb->feature_map = 0; | |
1525 | sb->pad0 = 0; | |
5fd6c1dc | 1526 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1527 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1528 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1529 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1530 | ||
1531 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1532 | sb->events = cpu_to_le64(mddev->events); | |
1533 | if (mddev->in_sync) | |
1534 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1535 | else | |
1536 | sb->resync_offset = cpu_to_le64(0); | |
1537 | ||
1c05b4bc | 1538 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1539 | |
f0ca340c | 1540 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1541 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1542 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1543 | sb->level = cpu_to_le32(mddev->level); |
1544 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1545 | |
c3d9714e N |
1546 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1547 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1548 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1549 | } |
5fd6c1dc N |
1550 | |
1551 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1552 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1553 | sb->feature_map |= |
1554 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1555 | sb->recovery_offset = | |
1556 | cpu_to_le64(rdev->recovery_offset); | |
5fd6c1dc N |
1557 | } |
1558 | ||
f6705578 N |
1559 | if (mddev->reshape_position != MaxSector) { |
1560 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1561 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1562 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1563 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1564 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1565 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
f6705578 | 1566 | } |
a654b9d8 | 1567 | |
1da177e4 | 1568 | max_dev = 0; |
159ec1fc | 1569 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
1da177e4 LT |
1570 | if (rdev2->desc_nr+1 > max_dev) |
1571 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1572 | |
70471daf N |
1573 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1574 | int bmask; | |
a778b73f | 1575 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1576 | rdev->sb_size = max_dev * 2 + 256; |
1577 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1578 | if (rdev->sb_size & bmask) | |
1579 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1580 | } else |
1581 | max_dev = le32_to_cpu(sb->max_dev); | |
1582 | ||
1da177e4 LT |
1583 | for (i=0; i<max_dev;i++) |
1584 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1585 | ||
159ec1fc | 1586 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1587 | i = rdev2->desc_nr; |
b2d444d7 | 1588 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1589 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1590 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1591 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1592 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1593 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1594 | else |
1595 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1596 | } | |
1597 | ||
1da177e4 LT |
1598 | sb->sb_csum = calc_sb_1_csum(sb); |
1599 | } | |
1600 | ||
0cd17fec | 1601 | static unsigned long long |
15f4a5fd | 1602 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec CW |
1603 | { |
1604 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1605 | sector_t max_sectors; |
58c0fed4 | 1606 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1607 | return 0; /* component must fit device */ |
0f420358 | 1608 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1609 | /* minor versions 1 and 2; superblock before data */ |
15f4a5fd AN |
1610 | max_sectors = rdev->bdev->bd_inode->i_size >> 9; |
1611 | max_sectors -= rdev->data_offset; | |
1612 | if (!num_sectors || num_sectors > max_sectors) | |
1613 | num_sectors = max_sectors; | |
c3d9714e | 1614 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1615 | /* minor version 0 with bitmap we can't move */ |
1616 | return 0; | |
1617 | } else { | |
1618 | /* minor version 0; superblock after data */ | |
0f420358 AN |
1619 | sector_t sb_start; |
1620 | sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2; | |
1621 | sb_start &= ~(sector_t)(4*2 - 1); | |
dd8ac336 | 1622 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1623 | if (!num_sectors || num_sectors > max_sectors) |
1624 | num_sectors = max_sectors; | |
0f420358 | 1625 | rdev->sb_start = sb_start; |
0cd17fec CW |
1626 | } |
1627 | sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); | |
15f4a5fd | 1628 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1629 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1630 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1631 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1632 | rdev->sb_page); |
1633 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1634 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec | 1635 | } |
1da177e4 | 1636 | |
75c96f85 | 1637 | static struct super_type super_types[] = { |
1da177e4 LT |
1638 | [0] = { |
1639 | .name = "0.90.0", | |
1640 | .owner = THIS_MODULE, | |
0cd17fec CW |
1641 | .load_super = super_90_load, |
1642 | .validate_super = super_90_validate, | |
1643 | .sync_super = super_90_sync, | |
1644 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1645 | }, |
1646 | [1] = { | |
1647 | .name = "md-1", | |
1648 | .owner = THIS_MODULE, | |
0cd17fec CW |
1649 | .load_super = super_1_load, |
1650 | .validate_super = super_1_validate, | |
1651 | .sync_super = super_1_sync, | |
1652 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1653 | }, |
1654 | }; | |
1da177e4 LT |
1655 | |
1656 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1657 | { | |
7dd5e7c3 | 1658 | mdk_rdev_t *rdev, *rdev2; |
1da177e4 | 1659 | |
4b80991c N |
1660 | rcu_read_lock(); |
1661 | rdev_for_each_rcu(rdev, mddev1) | |
1662 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1663 | if (rdev->bdev->bd_contains == |
4b80991c N |
1664 | rdev2->bdev->bd_contains) { |
1665 | rcu_read_unlock(); | |
7dd5e7c3 | 1666 | return 1; |
4b80991c N |
1667 | } |
1668 | rcu_read_unlock(); | |
1da177e4 LT |
1669 | return 0; |
1670 | } | |
1671 | ||
1672 | static LIST_HEAD(pending_raid_disks); | |
1673 | ||
ac5e7113 AN |
1674 | /* |
1675 | * Try to register data integrity profile for an mddev | |
1676 | * | |
1677 | * This is called when an array is started and after a disk has been kicked | |
1678 | * from the array. It only succeeds if all working and active component devices | |
1679 | * are integrity capable with matching profiles. | |
1680 | */ | |
1681 | int md_integrity_register(mddev_t *mddev) | |
1682 | { | |
1683 | mdk_rdev_t *rdev, *reference = NULL; | |
1684 | ||
1685 | if (list_empty(&mddev->disks)) | |
1686 | return 0; /* nothing to do */ | |
1687 | if (blk_get_integrity(mddev->gendisk)) | |
1688 | return 0; /* already registered */ | |
1689 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
1690 | /* skip spares and non-functional disks */ | |
1691 | if (test_bit(Faulty, &rdev->flags)) | |
1692 | continue; | |
1693 | if (rdev->raid_disk < 0) | |
1694 | continue; | |
1695 | /* | |
1696 | * If at least one rdev is not integrity capable, we can not | |
1697 | * enable data integrity for the md device. | |
1698 | */ | |
1699 | if (!bdev_get_integrity(rdev->bdev)) | |
1700 | return -EINVAL; | |
1701 | if (!reference) { | |
1702 | /* Use the first rdev as the reference */ | |
1703 | reference = rdev; | |
1704 | continue; | |
1705 | } | |
1706 | /* does this rdev's profile match the reference profile? */ | |
1707 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1708 | rdev->bdev->bd_disk) < 0) | |
1709 | return -EINVAL; | |
1710 | } | |
1711 | /* | |
1712 | * All component devices are integrity capable and have matching | |
1713 | * profiles, register the common profile for the md device. | |
1714 | */ | |
1715 | if (blk_integrity_register(mddev->gendisk, | |
1716 | bdev_get_integrity(reference->bdev)) != 0) { | |
1717 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1718 | mdname(mddev)); | |
1719 | return -EINVAL; | |
1720 | } | |
1721 | printk(KERN_NOTICE "md: data integrity on %s enabled\n", | |
1722 | mdname(mddev)); | |
1723 | return 0; | |
1724 | } | |
1725 | EXPORT_SYMBOL(md_integrity_register); | |
1726 | ||
1727 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
1728 | void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev) | |
3f9d99c1 | 1729 | { |
3f9d99c1 | 1730 | struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); |
ac5e7113 | 1731 | struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk); |
3f9d99c1 | 1732 | |
ac5e7113 | 1733 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 1734 | return; |
ac5e7113 | 1735 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 1736 | return; |
ac5e7113 AN |
1737 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
1738 | rdev->bdev->bd_disk) >= 0) | |
1739 | return; | |
1740 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
1741 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 1742 | } |
ac5e7113 | 1743 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 1744 | |
1da177e4 LT |
1745 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) |
1746 | { | |
7dd5e7c3 | 1747 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1748 | struct kobject *ko; |
1edf80d3 | 1749 | char *s; |
5e55e2f5 | 1750 | int err; |
1da177e4 LT |
1751 | |
1752 | if (rdev->mddev) { | |
1753 | MD_BUG(); | |
1754 | return -EINVAL; | |
1755 | } | |
11e2ede0 DW |
1756 | |
1757 | /* prevent duplicates */ | |
1758 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
1759 | return -EEXIST; | |
1760 | ||
dd8ac336 AN |
1761 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
1762 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
1763 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
1764 | if (mddev->pers) { |
1765 | /* Cannot change size, so fail | |
1766 | * If mddev->level <= 0, then we don't care | |
1767 | * about aligning sizes (e.g. linear) | |
1768 | */ | |
1769 | if (mddev->level > 0) | |
1770 | return -ENOSPC; | |
1771 | } else | |
dd8ac336 | 1772 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 1773 | } |
1da177e4 LT |
1774 | |
1775 | /* Verify rdev->desc_nr is unique. | |
1776 | * If it is -1, assign a free number, else | |
1777 | * check number is not in use | |
1778 | */ | |
1779 | if (rdev->desc_nr < 0) { | |
1780 | int choice = 0; | |
1781 | if (mddev->pers) choice = mddev->raid_disks; | |
1782 | while (find_rdev_nr(mddev, choice)) | |
1783 | choice++; | |
1784 | rdev->desc_nr = choice; | |
1785 | } else { | |
1786 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1787 | return -EBUSY; | |
1788 | } | |
de01dfad N |
1789 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
1790 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
1791 | mdname(mddev), mddev->max_disks); | |
1792 | return -EBUSY; | |
1793 | } | |
19133a42 | 1794 | bdevname(rdev->bdev,b); |
649316b2 | 1795 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1796 | *s = '!'; |
649316b2 | 1797 | |
1da177e4 | 1798 | rdev->mddev = mddev; |
19133a42 | 1799 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1800 | |
b2d6db58 | 1801 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1802 | goto fail; |
86e6ffdd | 1803 | |
0762b8bd | 1804 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
1805 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
1806 | /* failure here is OK */; | |
1807 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 1808 | |
4b80991c | 1809 | list_add_rcu(&rdev->same_set, &mddev->disks); |
c5d79adb | 1810 | bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); |
4044ba58 N |
1811 | |
1812 | /* May as well allow recovery to be retried once */ | |
1813 | mddev->recovery_disabled = 0; | |
3f9d99c1 | 1814 | |
1da177e4 | 1815 | return 0; |
5e55e2f5 N |
1816 | |
1817 | fail: | |
1818 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1819 | b, mdname(mddev)); | |
1820 | return err; | |
1da177e4 LT |
1821 | } |
1822 | ||
177a99b2 | 1823 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
1824 | { |
1825 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1826 | kobject_del(&rdev->kobj); | |
177a99b2 | 1827 | kobject_put(&rdev->kobj); |
5792a285 N |
1828 | } |
1829 | ||
1da177e4 LT |
1830 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1831 | { | |
1832 | char b[BDEVNAME_SIZE]; | |
1833 | if (!rdev->mddev) { | |
1834 | MD_BUG(); | |
1835 | return; | |
1836 | } | |
5463c790 | 1837 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 1838 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
1839 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
1840 | rdev->mddev = NULL; | |
86e6ffdd | 1841 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
1842 | sysfs_put(rdev->sysfs_state); |
1843 | rdev->sysfs_state = NULL; | |
5792a285 | 1844 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
1845 | * writing to 'remove' to "dev/state". We also need |
1846 | * to delay it due to rcu usage. | |
5792a285 | 1847 | */ |
4b80991c | 1848 | synchronize_rcu(); |
177a99b2 N |
1849 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
1850 | kobject_get(&rdev->kobj); | |
5792a285 | 1851 | schedule_work(&rdev->del_work); |
1da177e4 LT |
1852 | } |
1853 | ||
1854 | /* | |
1855 | * prevent the device from being mounted, repartitioned or | |
1856 | * otherwise reused by a RAID array (or any other kernel | |
1857 | * subsystem), by bd_claiming the device. | |
1858 | */ | |
c5d79adb | 1859 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
1860 | { |
1861 | int err = 0; | |
1862 | struct block_device *bdev; | |
1863 | char b[BDEVNAME_SIZE]; | |
1864 | ||
2e7b651d | 1865 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1866 | if (IS_ERR(bdev)) { |
1867 | printk(KERN_ERR "md: could not open %s.\n", | |
1868 | __bdevname(dev, b)); | |
1869 | return PTR_ERR(bdev); | |
1870 | } | |
c5d79adb | 1871 | err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); |
1da177e4 LT |
1872 | if (err) { |
1873 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1874 | bdevname(bdev, b)); | |
9a1c3542 | 1875 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1876 | return err; |
1877 | } | |
c5d79adb N |
1878 | if (!shared) |
1879 | set_bit(AllReserved, &rdev->flags); | |
1da177e4 LT |
1880 | rdev->bdev = bdev; |
1881 | return err; | |
1882 | } | |
1883 | ||
1884 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1885 | { | |
1886 | struct block_device *bdev = rdev->bdev; | |
1887 | rdev->bdev = NULL; | |
1888 | if (!bdev) | |
1889 | MD_BUG(); | |
1890 | bd_release(bdev); | |
9a1c3542 | 1891 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1892 | } |
1893 | ||
1894 | void md_autodetect_dev(dev_t dev); | |
1895 | ||
1896 | static void export_rdev(mdk_rdev_t * rdev) | |
1897 | { | |
1898 | char b[BDEVNAME_SIZE]; | |
1899 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1900 | bdevname(rdev->bdev,b)); | |
1901 | if (rdev->mddev) | |
1902 | MD_BUG(); | |
1903 | free_disk_sb(rdev); | |
1da177e4 | 1904 | #ifndef MODULE |
d0fae18f N |
1905 | if (test_bit(AutoDetected, &rdev->flags)) |
1906 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
1907 | #endif |
1908 | unlock_rdev(rdev); | |
86e6ffdd | 1909 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1910 | } |
1911 | ||
1912 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1913 | { | |
1914 | unbind_rdev_from_array(rdev); | |
1915 | export_rdev(rdev); | |
1916 | } | |
1917 | ||
1918 | static void export_array(mddev_t *mddev) | |
1919 | { | |
159ec1fc | 1920 | mdk_rdev_t *rdev, *tmp; |
1da177e4 | 1921 | |
d089c6af | 1922 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1923 | if (!rdev->mddev) { |
1924 | MD_BUG(); | |
1925 | continue; | |
1926 | } | |
1927 | kick_rdev_from_array(rdev); | |
1928 | } | |
1929 | if (!list_empty(&mddev->disks)) | |
1930 | MD_BUG(); | |
1931 | mddev->raid_disks = 0; | |
1932 | mddev->major_version = 0; | |
1933 | } | |
1934 | ||
1935 | static void print_desc(mdp_disk_t *desc) | |
1936 | { | |
1937 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1938 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1939 | } | |
1940 | ||
cd2ac932 | 1941 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
1942 | { |
1943 | int i; | |
1944 | ||
1945 | printk(KERN_INFO | |
1946 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1947 | sb->major_version, sb->minor_version, sb->patch_version, | |
1948 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1949 | sb->ctime); | |
1950 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1951 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1952 | sb->md_minor, sb->layout, sb->chunk_size); | |
1953 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1954 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1955 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1956 | sb->failed_disks, sb->spare_disks, | |
1957 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1958 | ||
1959 | printk(KERN_INFO); | |
1960 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1961 | mdp_disk_t *desc; | |
1962 | ||
1963 | desc = sb->disks + i; | |
1964 | if (desc->number || desc->major || desc->minor || | |
1965 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1966 | printk(" D %2d: ", i); | |
1967 | print_desc(desc); | |
1968 | } | |
1969 | } | |
1970 | printk(KERN_INFO "md: THIS: "); | |
1971 | print_desc(&sb->this_disk); | |
cd2ac932 | 1972 | } |
1da177e4 | 1973 | |
cd2ac932 CR |
1974 | static void print_sb_1(struct mdp_superblock_1 *sb) |
1975 | { | |
1976 | __u8 *uuid; | |
1977 | ||
1978 | uuid = sb->set_uuid; | |
ad361c98 | 1979 | printk(KERN_INFO |
7b75c2f8 | 1980 | "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n" |
ad361c98 | 1981 | "md: Name: \"%s\" CT:%llu\n", |
cd2ac932 CR |
1982 | le32_to_cpu(sb->major_version), |
1983 | le32_to_cpu(sb->feature_map), | |
7b75c2f8 | 1984 | uuid, |
cd2ac932 CR |
1985 | sb->set_name, |
1986 | (unsigned long long)le64_to_cpu(sb->ctime) | |
1987 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
1988 | ||
1989 | uuid = sb->device_uuid; | |
ad361c98 JP |
1990 | printk(KERN_INFO |
1991 | "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
cd2ac932 | 1992 | " RO:%llu\n" |
7b75c2f8 | 1993 | "md: Dev:%08x UUID: %pU\n" |
ad361c98 JP |
1994 | "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" |
1995 | "md: (MaxDev:%u) \n", | |
cd2ac932 CR |
1996 | le32_to_cpu(sb->level), |
1997 | (unsigned long long)le64_to_cpu(sb->size), | |
1998 | le32_to_cpu(sb->raid_disks), | |
1999 | le32_to_cpu(sb->layout), | |
2000 | le32_to_cpu(sb->chunksize), | |
2001 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
2002 | (unsigned long long)le64_to_cpu(sb->data_size), | |
2003 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
2004 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
2005 | le32_to_cpu(sb->dev_number), | |
7b75c2f8 | 2006 | uuid, |
cd2ac932 CR |
2007 | sb->devflags, |
2008 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
2009 | (unsigned long long)le64_to_cpu(sb->events), | |
2010 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
2011 | le32_to_cpu(sb->sb_csum), | |
2012 | le32_to_cpu(sb->max_dev) | |
2013 | ); | |
1da177e4 LT |
2014 | } |
2015 | ||
cd2ac932 | 2016 | static void print_rdev(mdk_rdev_t *rdev, int major_version) |
1da177e4 LT |
2017 | { |
2018 | char b[BDEVNAME_SIZE]; | |
dd8ac336 AN |
2019 | printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", |
2020 | bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, | |
b2d444d7 N |
2021 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
2022 | rdev->desc_nr); | |
1da177e4 | 2023 | if (rdev->sb_loaded) { |
cd2ac932 CR |
2024 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
2025 | switch (major_version) { | |
2026 | case 0: | |
2027 | print_sb_90((mdp_super_t*)page_address(rdev->sb_page)); | |
2028 | break; | |
2029 | case 1: | |
2030 | print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page)); | |
2031 | break; | |
2032 | } | |
1da177e4 LT |
2033 | } else |
2034 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
2035 | } | |
2036 | ||
5e56341d | 2037 | static void md_print_devices(void) |
1da177e4 | 2038 | { |
159ec1fc | 2039 | struct list_head *tmp; |
1da177e4 LT |
2040 | mdk_rdev_t *rdev; |
2041 | mddev_t *mddev; | |
2042 | char b[BDEVNAME_SIZE]; | |
2043 | ||
2044 | printk("\n"); | |
2045 | printk("md: **********************************\n"); | |
2046 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
2047 | printk("md: **********************************\n"); | |
29ac4aa3 | 2048 | for_each_mddev(mddev, tmp) { |
1da177e4 | 2049 | |
32a7627c N |
2050 | if (mddev->bitmap) |
2051 | bitmap_print_sb(mddev->bitmap); | |
2052 | else | |
2053 | printk("%s: ", mdname(mddev)); | |
159ec1fc | 2054 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
2055 | printk("<%s>", bdevname(rdev->bdev,b)); |
2056 | printk("\n"); | |
2057 | ||
159ec1fc | 2058 | list_for_each_entry(rdev, &mddev->disks, same_set) |
cd2ac932 | 2059 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
2060 | } |
2061 | printk("md: **********************************\n"); | |
2062 | printk("\n"); | |
2063 | } | |
2064 | ||
2065 | ||
42543769 | 2066 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 2067 | { |
42543769 N |
2068 | /* Update each superblock (in-memory image), but |
2069 | * if we are allowed to, skip spares which already | |
2070 | * have the right event counter, or have one earlier | |
2071 | * (which would mean they aren't being marked as dirty | |
2072 | * with the rest of the array) | |
2073 | */ | |
1da177e4 | 2074 | mdk_rdev_t *rdev; |
159ec1fc | 2075 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
42543769 N |
2076 | if (rdev->sb_events == mddev->events || |
2077 | (nospares && | |
2078 | rdev->raid_disk < 0 && | |
42543769 N |
2079 | rdev->sb_events+1 == mddev->events)) { |
2080 | /* Don't update this superblock */ | |
2081 | rdev->sb_loaded = 2; | |
2082 | } else { | |
2083 | super_types[mddev->major_version]. | |
2084 | sync_super(mddev, rdev); | |
2085 | rdev->sb_loaded = 1; | |
2086 | } | |
1da177e4 LT |
2087 | } |
2088 | } | |
2089 | ||
850b2b42 | 2090 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 2091 | { |
1da177e4 | 2092 | mdk_rdev_t *rdev; |
06d91a5f | 2093 | int sync_req; |
42543769 | 2094 | int nospares = 0; |
1da177e4 | 2095 | |
1da177e4 | 2096 | repeat: |
3a3a5ddb N |
2097 | /* First make sure individual recovery_offsets are correct */ |
2098 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
2099 | if (rdev->raid_disk >= 0 && | |
2100 | mddev->delta_disks >= 0 && | |
2101 | !test_bit(In_sync, &rdev->flags) && | |
2102 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2103 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2104 | ||
2105 | } | |
bd52b746 | 2106 | if (!mddev->persistent) { |
070dc6dd | 2107 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2108 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
d97a41dc N |
2109 | if (!mddev->external) |
2110 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
3a3a5ddb N |
2111 | wake_up(&mddev->sb_wait); |
2112 | return; | |
2113 | } | |
2114 | ||
a9701a30 | 2115 | spin_lock_irq(&mddev->write_lock); |
84692195 | 2116 | |
3a3a5ddb N |
2117 | mddev->utime = get_seconds(); |
2118 | ||
850b2b42 N |
2119 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2120 | force_change = 1; | |
2121 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2122 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2123 | * though if events isn't the right even/odd, we will have to do | |
2124 | * spares after all | |
2125 | */ | |
2126 | nospares = 1; | |
2127 | if (force_change) | |
2128 | nospares = 0; | |
2129 | if (mddev->degraded) | |
84692195 N |
2130 | /* If the array is degraded, then skipping spares is both |
2131 | * dangerous and fairly pointless. | |
2132 | * Dangerous because a device that was removed from the array | |
2133 | * might have a event_count that still looks up-to-date, | |
2134 | * so it can be re-added without a resync. | |
2135 | * Pointless because if there are any spares to skip, | |
2136 | * then a recovery will happen and soon that array won't | |
2137 | * be degraded any more and the spare can go back to sleep then. | |
2138 | */ | |
850b2b42 | 2139 | nospares = 0; |
84692195 | 2140 | |
06d91a5f | 2141 | sync_req = mddev->in_sync; |
42543769 N |
2142 | |
2143 | /* If this is just a dirty<->clean transition, and the array is clean | |
2144 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2145 | if (nospares |
42543769 | 2146 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2147 | && mddev->can_decrease_events |
2148 | && mddev->events != 1) { | |
42543769 | 2149 | mddev->events--; |
a8707c08 N |
2150 | mddev->can_decrease_events = 0; |
2151 | } else { | |
42543769 N |
2152 | /* otherwise we have to go forward and ... */ |
2153 | mddev->events ++; | |
a8707c08 | 2154 | mddev->can_decrease_events = nospares; |
42543769 | 2155 | } |
1da177e4 LT |
2156 | |
2157 | if (!mddev->events) { | |
2158 | /* | |
2159 | * oops, this 64-bit counter should never wrap. | |
2160 | * Either we are in around ~1 trillion A.C., assuming | |
2161 | * 1 reboot per second, or we have a bug: | |
2162 | */ | |
2163 | MD_BUG(); | |
2164 | mddev->events --; | |
2165 | } | |
e691063a | 2166 | sync_sbs(mddev, nospares); |
a9701a30 | 2167 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
2168 | |
2169 | dprintk(KERN_INFO | |
2170 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
2171 | mdname(mddev),mddev->in_sync); | |
2172 | ||
4ad13663 | 2173 | bitmap_update_sb(mddev->bitmap); |
159ec1fc | 2174 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
2175 | char b[BDEVNAME_SIZE]; |
2176 | dprintk(KERN_INFO "md: "); | |
42543769 N |
2177 | if (rdev->sb_loaded != 1) |
2178 | continue; /* no noise on spare devices */ | |
b2d444d7 | 2179 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2180 | dprintk("(skipping faulty "); |
2181 | ||
2182 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 2183 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2184 | md_super_write(mddev,rdev, |
0f420358 | 2185 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 N |
2186 | rdev->sb_page); |
2187 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
2188 | bdevname(rdev->bdev,b), | |
0f420358 | 2189 | (unsigned long long)rdev->sb_start); |
42543769 | 2190 | rdev->sb_events = mddev->events; |
7bfa19f2 | 2191 | |
1da177e4 LT |
2192 | } else |
2193 | dprintk(")\n"); | |
7bfa19f2 | 2194 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2195 | /* only need to write one superblock... */ |
2196 | break; | |
2197 | } | |
a9701a30 | 2198 | md_super_wait(mddev); |
850b2b42 | 2199 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2200 | |
a9701a30 | 2201 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
2202 | if (mddev->in_sync != sync_req || |
2203 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2204 | /* have to write it out again */ |
a9701a30 | 2205 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
2206 | goto repeat; |
2207 | } | |
850b2b42 | 2208 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 2209 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 2210 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2211 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2212 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2213 | |
1da177e4 LT |
2214 | } |
2215 | ||
7f6ce769 | 2216 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2217 | * We want to accept with case. For this we use cmd_match. |
2218 | */ | |
2219 | static int cmd_match(const char *cmd, const char *str) | |
2220 | { | |
2221 | /* See if cmd, written into a sysfs file, matches | |
2222 | * str. They must either be the same, or cmd can | |
2223 | * have a trailing newline | |
2224 | */ | |
2225 | while (*cmd && *str && *cmd == *str) { | |
2226 | cmd++; | |
2227 | str++; | |
2228 | } | |
2229 | if (*cmd == '\n') | |
2230 | cmd++; | |
2231 | if (*str || *cmd) | |
2232 | return 0; | |
2233 | return 1; | |
2234 | } | |
2235 | ||
86e6ffdd N |
2236 | struct rdev_sysfs_entry { |
2237 | struct attribute attr; | |
2238 | ssize_t (*show)(mdk_rdev_t *, char *); | |
2239 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
2240 | }; | |
2241 | ||
2242 | static ssize_t | |
96de1e66 | 2243 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
2244 | { |
2245 | char *sep = ""; | |
20a49ff6 | 2246 | size_t len = 0; |
86e6ffdd | 2247 | |
b2d444d7 | 2248 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
2249 | len+= sprintf(page+len, "%sfaulty",sep); |
2250 | sep = ","; | |
2251 | } | |
b2d444d7 | 2252 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2253 | len += sprintf(page+len, "%sin_sync",sep); |
2254 | sep = ","; | |
2255 | } | |
f655675b N |
2256 | if (test_bit(WriteMostly, &rdev->flags)) { |
2257 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2258 | sep = ","; | |
2259 | } | |
6bfe0b49 DW |
2260 | if (test_bit(Blocked, &rdev->flags)) { |
2261 | len += sprintf(page+len, "%sblocked", sep); | |
2262 | sep = ","; | |
2263 | } | |
b2d444d7 N |
2264 | if (!test_bit(Faulty, &rdev->flags) && |
2265 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2266 | len += sprintf(page+len, "%sspare", sep); |
2267 | sep = ","; | |
2268 | } | |
2269 | return len+sprintf(page+len, "\n"); | |
2270 | } | |
2271 | ||
45dc2de1 N |
2272 | static ssize_t |
2273 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2274 | { | |
2275 | /* can write | |
2276 | * faulty - simulates and error | |
2277 | * remove - disconnects the device | |
f655675b N |
2278 | * writemostly - sets write_mostly |
2279 | * -writemostly - clears write_mostly | |
6bfe0b49 DW |
2280 | * blocked - sets the Blocked flag |
2281 | * -blocked - clears the Blocked flag | |
6d56e278 | 2282 | * insync - sets Insync providing device isn't active |
45dc2de1 N |
2283 | */ |
2284 | int err = -EINVAL; | |
2285 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2286 | md_error(rdev->mddev, rdev); | |
2287 | err = 0; | |
2288 | } else if (cmd_match(buf, "remove")) { | |
2289 | if (rdev->raid_disk >= 0) | |
2290 | err = -EBUSY; | |
2291 | else { | |
2292 | mddev_t *mddev = rdev->mddev; | |
2293 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
2294 | if (mddev->pers) |
2295 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2296 | md_new_event(mddev); |
2297 | err = 0; | |
2298 | } | |
f655675b N |
2299 | } else if (cmd_match(buf, "writemostly")) { |
2300 | set_bit(WriteMostly, &rdev->flags); | |
2301 | err = 0; | |
2302 | } else if (cmd_match(buf, "-writemostly")) { | |
2303 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2304 | err = 0; |
2305 | } else if (cmd_match(buf, "blocked")) { | |
2306 | set_bit(Blocked, &rdev->flags); | |
2307 | err = 0; | |
2308 | } else if (cmd_match(buf, "-blocked")) { | |
2309 | clear_bit(Blocked, &rdev->flags); | |
2310 | wake_up(&rdev->blocked_wait); | |
2311 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2312 | md_wakeup_thread(rdev->mddev->thread); | |
2313 | ||
6d56e278 N |
2314 | err = 0; |
2315 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2316 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2317 | err = 0; |
45dc2de1 | 2318 | } |
00bcb4ac N |
2319 | if (!err) |
2320 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2321 | return err ? err : len; |
2322 | } | |
80ca3a44 N |
2323 | static struct rdev_sysfs_entry rdev_state = |
2324 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2325 | |
4dbcdc75 N |
2326 | static ssize_t |
2327 | errors_show(mdk_rdev_t *rdev, char *page) | |
2328 | { | |
2329 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2330 | } | |
2331 | ||
2332 | static ssize_t | |
2333 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2334 | { | |
2335 | char *e; | |
2336 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2337 | if (*buf && (*e == 0 || *e == '\n')) { | |
2338 | atomic_set(&rdev->corrected_errors, n); | |
2339 | return len; | |
2340 | } | |
2341 | return -EINVAL; | |
2342 | } | |
2343 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2344 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2345 | |
014236d2 N |
2346 | static ssize_t |
2347 | slot_show(mdk_rdev_t *rdev, char *page) | |
2348 | { | |
2349 | if (rdev->raid_disk < 0) | |
2350 | return sprintf(page, "none\n"); | |
2351 | else | |
2352 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2353 | } | |
2354 | ||
2355 | static ssize_t | |
2356 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2357 | { | |
2358 | char *e; | |
c303da6d N |
2359 | int err; |
2360 | char nm[20]; | |
014236d2 N |
2361 | int slot = simple_strtoul(buf, &e, 10); |
2362 | if (strncmp(buf, "none", 4)==0) | |
2363 | slot = -1; | |
2364 | else if (e==buf || (*e && *e!= '\n')) | |
2365 | return -EINVAL; | |
6c2fce2e | 2366 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2367 | /* Setting 'slot' on an active array requires also |
2368 | * updating the 'rd%d' link, and communicating | |
2369 | * with the personality with ->hot_*_disk. | |
2370 | * For now we only support removing | |
2371 | * failed/spare devices. This normally happens automatically, | |
2372 | * but not when the metadata is externally managed. | |
2373 | */ | |
c303da6d N |
2374 | if (rdev->raid_disk == -1) |
2375 | return -EEXIST; | |
2376 | /* personality does all needed checks */ | |
2377 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2378 | return -EINVAL; | |
2379 | err = rdev->mddev->pers-> | |
2380 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
2381 | if (err) | |
2382 | return err; | |
2383 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2384 | sysfs_remove_link(&rdev->mddev->kobj, nm); | |
b7103107 | 2385 | rdev->raid_disk = -1; |
c303da6d N |
2386 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2387 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e NB |
2388 | } else if (rdev->mddev->pers) { |
2389 | mdk_rdev_t *rdev2; | |
6c2fce2e | 2390 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2391 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2392 | */ |
2393 | ||
2394 | if (rdev->raid_disk != -1) | |
2395 | return -EBUSY; | |
2396 | ||
2397 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2398 | return -EINVAL; | |
2399 | ||
159ec1fc | 2400 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) |
6c2fce2e NB |
2401 | if (rdev2->raid_disk == slot) |
2402 | return -EEXIST; | |
2403 | ||
2404 | rdev->raid_disk = slot; | |
2405 | if (test_bit(In_sync, &rdev->flags)) | |
2406 | rdev->saved_raid_disk = slot; | |
2407 | else | |
2408 | rdev->saved_raid_disk = -1; | |
2409 | err = rdev->mddev->pers-> | |
2410 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2411 | if (err) { |
6c2fce2e | 2412 | rdev->raid_disk = -1; |
6c2fce2e | 2413 | return err; |
52664732 | 2414 | } else |
00bcb4ac | 2415 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6c2fce2e NB |
2416 | sprintf(nm, "rd%d", rdev->raid_disk); |
2417 | if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm)) | |
00bcb4ac | 2418 | /* failure here is OK */; |
6c2fce2e | 2419 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d N |
2420 | } else { |
2421 | if (slot >= rdev->mddev->raid_disks) | |
2422 | return -ENOSPC; | |
2423 | rdev->raid_disk = slot; | |
2424 | /* assume it is working */ | |
c5d79adb N |
2425 | clear_bit(Faulty, &rdev->flags); |
2426 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2427 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2428 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2429 | } |
014236d2 N |
2430 | return len; |
2431 | } | |
2432 | ||
2433 | ||
2434 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2435 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2436 | |
93c8cad0 N |
2437 | static ssize_t |
2438 | offset_show(mdk_rdev_t *rdev, char *page) | |
2439 | { | |
6961ece4 | 2440 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2441 | } |
2442 | ||
2443 | static ssize_t | |
2444 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2445 | { | |
2446 | char *e; | |
2447 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2448 | if (e==buf || (*e && *e != '\n')) | |
2449 | return -EINVAL; | |
8ed0a521 | 2450 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2451 | return -EBUSY; |
dd8ac336 | 2452 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2453 | /* Must set offset before size, so overlap checks |
2454 | * can be sane */ | |
2455 | return -EBUSY; | |
93c8cad0 N |
2456 | rdev->data_offset = offset; |
2457 | return len; | |
2458 | } | |
2459 | ||
2460 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2461 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2462 | |
83303b61 N |
2463 | static ssize_t |
2464 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2465 | { | |
dd8ac336 | 2466 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2467 | } |
2468 | ||
c5d79adb N |
2469 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2470 | { | |
2471 | /* check if two start/length pairs overlap */ | |
2472 | if (s1+l1 <= s2) | |
2473 | return 0; | |
2474 | if (s2+l2 <= s1) | |
2475 | return 0; | |
2476 | return 1; | |
2477 | } | |
2478 | ||
b522adcd DW |
2479 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2480 | { | |
2481 | unsigned long long blocks; | |
2482 | sector_t new; | |
2483 | ||
2484 | if (strict_strtoull(buf, 10, &blocks) < 0) | |
2485 | return -EINVAL; | |
2486 | ||
2487 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2488 | return -EINVAL; /* sector conversion overflow */ | |
2489 | ||
2490 | new = blocks * 2; | |
2491 | if (new != blocks * 2) | |
2492 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2493 | ||
2494 | *sectors = new; | |
2495 | return 0; | |
2496 | } | |
2497 | ||
83303b61 N |
2498 | static ssize_t |
2499 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2500 | { | |
27c529bb | 2501 | mddev_t *my_mddev = rdev->mddev; |
dd8ac336 | 2502 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2503 | sector_t sectors; |
27c529bb | 2504 | |
b522adcd | 2505 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2506 | return -EINVAL; |
0cd17fec | 2507 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2508 | if (my_mddev->persistent) { |
dd8ac336 AN |
2509 | sectors = super_types[my_mddev->major_version]. |
2510 | rdev_size_change(rdev, sectors); | |
2511 | if (!sectors) | |
0cd17fec | 2512 | return -EBUSY; |
dd8ac336 AN |
2513 | } else if (!sectors) |
2514 | sectors = (rdev->bdev->bd_inode->i_size >> 9) - | |
2515 | rdev->data_offset; | |
0cd17fec | 2516 | } |
dd8ac336 | 2517 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2518 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2519 | |
dd8ac336 AN |
2520 | rdev->sectors = sectors; |
2521 | if (sectors > oldsectors && my_mddev->external) { | |
c5d79adb N |
2522 | /* need to check that all other rdevs with the same ->bdev |
2523 | * do not overlap. We need to unlock the mddev to avoid | |
dd8ac336 | 2524 | * a deadlock. We have already changed rdev->sectors, and if |
c5d79adb N |
2525 | * we have to change it back, we will have the lock again. |
2526 | */ | |
2527 | mddev_t *mddev; | |
2528 | int overlap = 0; | |
159ec1fc | 2529 | struct list_head *tmp; |
c5d79adb | 2530 | |
27c529bb | 2531 | mddev_unlock(my_mddev); |
29ac4aa3 | 2532 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2533 | mdk_rdev_t *rdev2; |
2534 | ||
2535 | mddev_lock(mddev); | |
159ec1fc | 2536 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
c5d79adb N |
2537 | if (test_bit(AllReserved, &rdev2->flags) || |
2538 | (rdev->bdev == rdev2->bdev && | |
2539 | rdev != rdev2 && | |
dd8ac336 | 2540 | overlaps(rdev->data_offset, rdev->sectors, |
d07bd3bc | 2541 | rdev2->data_offset, |
dd8ac336 | 2542 | rdev2->sectors))) { |
c5d79adb N |
2543 | overlap = 1; |
2544 | break; | |
2545 | } | |
2546 | mddev_unlock(mddev); | |
2547 | if (overlap) { | |
2548 | mddev_put(mddev); | |
2549 | break; | |
2550 | } | |
2551 | } | |
27c529bb | 2552 | mddev_lock(my_mddev); |
c5d79adb N |
2553 | if (overlap) { |
2554 | /* Someone else could have slipped in a size | |
2555 | * change here, but doing so is just silly. | |
dd8ac336 | 2556 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2557 | * safe, and trust userspace not to race with |
2558 | * itself | |
2559 | */ | |
dd8ac336 | 2560 | rdev->sectors = oldsectors; |
c5d79adb N |
2561 | return -EBUSY; |
2562 | } | |
2563 | } | |
83303b61 N |
2564 | return len; |
2565 | } | |
2566 | ||
2567 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2568 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2569 | |
06e3c817 DW |
2570 | |
2571 | static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page) | |
2572 | { | |
2573 | unsigned long long recovery_start = rdev->recovery_offset; | |
2574 | ||
2575 | if (test_bit(In_sync, &rdev->flags) || | |
2576 | recovery_start == MaxSector) | |
2577 | return sprintf(page, "none\n"); | |
2578 | ||
2579 | return sprintf(page, "%llu\n", recovery_start); | |
2580 | } | |
2581 | ||
2582 | static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2583 | { | |
2584 | unsigned long long recovery_start; | |
2585 | ||
2586 | if (cmd_match(buf, "none")) | |
2587 | recovery_start = MaxSector; | |
2588 | else if (strict_strtoull(buf, 10, &recovery_start)) | |
2589 | return -EINVAL; | |
2590 | ||
2591 | if (rdev->mddev->pers && | |
2592 | rdev->raid_disk >= 0) | |
2593 | return -EBUSY; | |
2594 | ||
2595 | rdev->recovery_offset = recovery_start; | |
2596 | if (recovery_start == MaxSector) | |
2597 | set_bit(In_sync, &rdev->flags); | |
2598 | else | |
2599 | clear_bit(In_sync, &rdev->flags); | |
2600 | return len; | |
2601 | } | |
2602 | ||
2603 | static struct rdev_sysfs_entry rdev_recovery_start = | |
2604 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
2605 | ||
86e6ffdd N |
2606 | static struct attribute *rdev_default_attrs[] = { |
2607 | &rdev_state.attr, | |
4dbcdc75 | 2608 | &rdev_errors.attr, |
014236d2 | 2609 | &rdev_slot.attr, |
93c8cad0 | 2610 | &rdev_offset.attr, |
83303b61 | 2611 | &rdev_size.attr, |
06e3c817 | 2612 | &rdev_recovery_start.attr, |
86e6ffdd N |
2613 | NULL, |
2614 | }; | |
2615 | static ssize_t | |
2616 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2617 | { | |
2618 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2619 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2620 | mddev_t *mddev = rdev->mddev; |
2621 | ssize_t rv; | |
86e6ffdd N |
2622 | |
2623 | if (!entry->show) | |
2624 | return -EIO; | |
27c529bb N |
2625 | |
2626 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2627 | if (!rv) { | |
2628 | if (rdev->mddev == NULL) | |
2629 | rv = -EBUSY; | |
2630 | else | |
2631 | rv = entry->show(rdev, page); | |
2632 | mddev_unlock(mddev); | |
2633 | } | |
2634 | return rv; | |
86e6ffdd N |
2635 | } |
2636 | ||
2637 | static ssize_t | |
2638 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2639 | const char *page, size_t length) | |
2640 | { | |
2641 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2642 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2643 | ssize_t rv; |
2644 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2645 | |
2646 | if (!entry->store) | |
2647 | return -EIO; | |
67463acb N |
2648 | if (!capable(CAP_SYS_ADMIN)) |
2649 | return -EACCES; | |
27c529bb | 2650 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2651 | if (!rv) { |
27c529bb N |
2652 | if (rdev->mddev == NULL) |
2653 | rv = -EBUSY; | |
2654 | else | |
2655 | rv = entry->store(rdev, page, length); | |
6a51830e | 2656 | mddev_unlock(mddev); |
ca388059 N |
2657 | } |
2658 | return rv; | |
86e6ffdd N |
2659 | } |
2660 | ||
2661 | static void rdev_free(struct kobject *ko) | |
2662 | { | |
2663 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2664 | kfree(rdev); | |
2665 | } | |
52cf25d0 | 2666 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
2667 | .show = rdev_attr_show, |
2668 | .store = rdev_attr_store, | |
2669 | }; | |
2670 | static struct kobj_type rdev_ktype = { | |
2671 | .release = rdev_free, | |
2672 | .sysfs_ops = &rdev_sysfs_ops, | |
2673 | .default_attrs = rdev_default_attrs, | |
2674 | }; | |
2675 | ||
e8bb9a83 N |
2676 | void md_rdev_init(mdk_rdev_t *rdev) |
2677 | { | |
2678 | rdev->desc_nr = -1; | |
2679 | rdev->saved_raid_disk = -1; | |
2680 | rdev->raid_disk = -1; | |
2681 | rdev->flags = 0; | |
2682 | rdev->data_offset = 0; | |
2683 | rdev->sb_events = 0; | |
2684 | rdev->last_read_error.tv_sec = 0; | |
2685 | rdev->last_read_error.tv_nsec = 0; | |
2686 | atomic_set(&rdev->nr_pending, 0); | |
2687 | atomic_set(&rdev->read_errors, 0); | |
2688 | atomic_set(&rdev->corrected_errors, 0); | |
2689 | ||
2690 | INIT_LIST_HEAD(&rdev->same_set); | |
2691 | init_waitqueue_head(&rdev->blocked_wait); | |
2692 | } | |
2693 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
2694 | /* |
2695 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2696 | * | |
2697 | * mark the device faulty if: | |
2698 | * | |
2699 | * - the device is nonexistent (zero size) | |
2700 | * - the device has no valid superblock | |
2701 | * | |
2702 | * a faulty rdev _never_ has rdev->sb set. | |
2703 | */ | |
2704 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2705 | { | |
2706 | char b[BDEVNAME_SIZE]; | |
2707 | int err; | |
2708 | mdk_rdev_t *rdev; | |
2709 | sector_t size; | |
2710 | ||
9ffae0cf | 2711 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2712 | if (!rdev) { |
2713 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2714 | return ERR_PTR(-ENOMEM); | |
2715 | } | |
1da177e4 | 2716 | |
e8bb9a83 | 2717 | md_rdev_init(rdev); |
1da177e4 LT |
2718 | if ((err = alloc_disk_sb(rdev))) |
2719 | goto abort_free; | |
2720 | ||
c5d79adb | 2721 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2722 | if (err) |
2723 | goto abort_free; | |
2724 | ||
f9cb074b | 2725 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2726 | |
1da177e4 LT |
2727 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; |
2728 | if (!size) { | |
2729 | printk(KERN_WARNING | |
2730 | "md: %s has zero or unknown size, marking faulty!\n", | |
2731 | bdevname(rdev->bdev,b)); | |
2732 | err = -EINVAL; | |
2733 | goto abort_free; | |
2734 | } | |
2735 | ||
2736 | if (super_format >= 0) { | |
2737 | err = super_types[super_format]. | |
2738 | load_super(rdev, NULL, super_minor); | |
2739 | if (err == -EINVAL) { | |
df968c4e N |
2740 | printk(KERN_WARNING |
2741 | "md: %s does not have a valid v%d.%d " | |
2742 | "superblock, not importing!\n", | |
2743 | bdevname(rdev->bdev,b), | |
2744 | super_format, super_minor); | |
1da177e4 LT |
2745 | goto abort_free; |
2746 | } | |
2747 | if (err < 0) { | |
2748 | printk(KERN_WARNING | |
2749 | "md: could not read %s's sb, not importing!\n", | |
2750 | bdevname(rdev->bdev,b)); | |
2751 | goto abort_free; | |
2752 | } | |
2753 | } | |
6bfe0b49 | 2754 | |
1da177e4 LT |
2755 | return rdev; |
2756 | ||
2757 | abort_free: | |
2758 | if (rdev->sb_page) { | |
2759 | if (rdev->bdev) | |
2760 | unlock_rdev(rdev); | |
2761 | free_disk_sb(rdev); | |
2762 | } | |
2763 | kfree(rdev); | |
2764 | return ERR_PTR(err); | |
2765 | } | |
2766 | ||
2767 | /* | |
2768 | * Check a full RAID array for plausibility | |
2769 | */ | |
2770 | ||
2771 | ||
a757e64c | 2772 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2773 | { |
2774 | int i; | |
159ec1fc | 2775 | mdk_rdev_t *rdev, *freshest, *tmp; |
1da177e4 LT |
2776 | char b[BDEVNAME_SIZE]; |
2777 | ||
2778 | freshest = NULL; | |
d089c6af | 2779 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
2780 | switch (super_types[mddev->major_version]. |
2781 | load_super(rdev, freshest, mddev->minor_version)) { | |
2782 | case 1: | |
2783 | freshest = rdev; | |
2784 | break; | |
2785 | case 0: | |
2786 | break; | |
2787 | default: | |
2788 | printk( KERN_ERR \ | |
2789 | "md: fatal superblock inconsistency in %s" | |
2790 | " -- removing from array\n", | |
2791 | bdevname(rdev->bdev,b)); | |
2792 | kick_rdev_from_array(rdev); | |
2793 | } | |
2794 | ||
2795 | ||
2796 | super_types[mddev->major_version]. | |
2797 | validate_super(mddev, freshest); | |
2798 | ||
2799 | i = 0; | |
d089c6af | 2800 | rdev_for_each(rdev, tmp, mddev) { |
233fca36 N |
2801 | if (mddev->max_disks && |
2802 | (rdev->desc_nr >= mddev->max_disks || | |
2803 | i > mddev->max_disks)) { | |
de01dfad N |
2804 | printk(KERN_WARNING |
2805 | "md: %s: %s: only %d devices permitted\n", | |
2806 | mdname(mddev), bdevname(rdev->bdev, b), | |
2807 | mddev->max_disks); | |
2808 | kick_rdev_from_array(rdev); | |
2809 | continue; | |
2810 | } | |
1da177e4 LT |
2811 | if (rdev != freshest) |
2812 | if (super_types[mddev->major_version]. | |
2813 | validate_super(mddev, rdev)) { | |
2814 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2815 | " from array!\n", | |
2816 | bdevname(rdev->bdev,b)); | |
2817 | kick_rdev_from_array(rdev); | |
2818 | continue; | |
2819 | } | |
2820 | if (mddev->level == LEVEL_MULTIPATH) { | |
2821 | rdev->desc_nr = i++; | |
2822 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2823 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 2824 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
2825 | rdev->raid_disk = -1; |
2826 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2827 | } |
2828 | } | |
1da177e4 LT |
2829 | } |
2830 | ||
72e02075 N |
2831 | /* Read a fixed-point number. |
2832 | * Numbers in sysfs attributes should be in "standard" units where | |
2833 | * possible, so time should be in seconds. | |
2834 | * However we internally use a a much smaller unit such as | |
2835 | * milliseconds or jiffies. | |
2836 | * This function takes a decimal number with a possible fractional | |
2837 | * component, and produces an integer which is the result of | |
2838 | * multiplying that number by 10^'scale'. | |
2839 | * all without any floating-point arithmetic. | |
2840 | */ | |
2841 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
2842 | { | |
2843 | unsigned long result = 0; | |
2844 | long decimals = -1; | |
2845 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
2846 | if (*cp == '.') | |
2847 | decimals = 0; | |
2848 | else if (decimals < scale) { | |
2849 | unsigned int value; | |
2850 | value = *cp - '0'; | |
2851 | result = result * 10 + value; | |
2852 | if (decimals >= 0) | |
2853 | decimals++; | |
2854 | } | |
2855 | cp++; | |
2856 | } | |
2857 | if (*cp == '\n') | |
2858 | cp++; | |
2859 | if (*cp) | |
2860 | return -EINVAL; | |
2861 | if (decimals < 0) | |
2862 | decimals = 0; | |
2863 | while (decimals < scale) { | |
2864 | result *= 10; | |
2865 | decimals ++; | |
2866 | } | |
2867 | *res = result; | |
2868 | return 0; | |
2869 | } | |
2870 | ||
2871 | ||
19052c0e N |
2872 | static void md_safemode_timeout(unsigned long data); |
2873 | ||
16f17b39 N |
2874 | static ssize_t |
2875 | safe_delay_show(mddev_t *mddev, char *page) | |
2876 | { | |
2877 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2878 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2879 | } | |
2880 | static ssize_t | |
2881 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2882 | { | |
16f17b39 | 2883 | unsigned long msec; |
97ce0a7f | 2884 | |
72e02075 | 2885 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 2886 | return -EINVAL; |
16f17b39 N |
2887 | if (msec == 0) |
2888 | mddev->safemode_delay = 0; | |
2889 | else { | |
19052c0e | 2890 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
2891 | mddev->safemode_delay = (msec*HZ)/1000; |
2892 | if (mddev->safemode_delay == 0) | |
2893 | mddev->safemode_delay = 1; | |
19052c0e N |
2894 | if (mddev->safemode_delay < old_delay) |
2895 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
2896 | } |
2897 | return len; | |
2898 | } | |
2899 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2900 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2901 | |
eae1701f | 2902 | static ssize_t |
96de1e66 | 2903 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2904 | { |
2604b703 | 2905 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2906 | if (p) |
eae1701f | 2907 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2908 | else if (mddev->clevel[0]) |
2909 | return sprintf(page, "%s\n", mddev->clevel); | |
2910 | else if (mddev->level != LEVEL_NONE) | |
2911 | return sprintf(page, "%d\n", mddev->level); | |
2912 | else | |
2913 | return 0; | |
eae1701f N |
2914 | } |
2915 | ||
d9d166c2 N |
2916 | static ssize_t |
2917 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2918 | { | |
f2859af6 | 2919 | char clevel[16]; |
20a49ff6 | 2920 | ssize_t rv = len; |
245f46c2 | 2921 | struct mdk_personality *pers; |
f2859af6 | 2922 | long level; |
245f46c2 | 2923 | void *priv; |
3a981b03 | 2924 | mdk_rdev_t *rdev; |
245f46c2 N |
2925 | |
2926 | if (mddev->pers == NULL) { | |
2927 | if (len == 0) | |
2928 | return 0; | |
2929 | if (len >= sizeof(mddev->clevel)) | |
2930 | return -ENOSPC; | |
2931 | strncpy(mddev->clevel, buf, len); | |
2932 | if (mddev->clevel[len-1] == '\n') | |
2933 | len--; | |
2934 | mddev->clevel[len] = 0; | |
2935 | mddev->level = LEVEL_NONE; | |
2936 | return rv; | |
2937 | } | |
2938 | ||
2939 | /* request to change the personality. Need to ensure: | |
2940 | * - array is not engaged in resync/recovery/reshape | |
2941 | * - old personality can be suspended | |
2942 | * - new personality will access other array. | |
2943 | */ | |
2944 | ||
bb4f1e9d N |
2945 | if (mddev->sync_thread || |
2946 | mddev->reshape_position != MaxSector || | |
2947 | mddev->sysfs_active) | |
d9d166c2 | 2948 | return -EBUSY; |
245f46c2 N |
2949 | |
2950 | if (!mddev->pers->quiesce) { | |
2951 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
2952 | mdname(mddev), mddev->pers->name); | |
2953 | return -EINVAL; | |
2954 | } | |
2955 | ||
2956 | /* Now find the new personality */ | |
f2859af6 | 2957 | if (len == 0 || len >= sizeof(clevel)) |
245f46c2 | 2958 | return -EINVAL; |
f2859af6 DW |
2959 | strncpy(clevel, buf, len); |
2960 | if (clevel[len-1] == '\n') | |
d9d166c2 | 2961 | len--; |
f2859af6 DW |
2962 | clevel[len] = 0; |
2963 | if (strict_strtol(clevel, 10, &level)) | |
2964 | level = LEVEL_NONE; | |
245f46c2 | 2965 | |
f2859af6 DW |
2966 | if (request_module("md-%s", clevel) != 0) |
2967 | request_module("md-level-%s", clevel); | |
245f46c2 | 2968 | spin_lock(&pers_lock); |
f2859af6 | 2969 | pers = find_pers(level, clevel); |
245f46c2 N |
2970 | if (!pers || !try_module_get(pers->owner)) { |
2971 | spin_unlock(&pers_lock); | |
f2859af6 | 2972 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
245f46c2 N |
2973 | return -EINVAL; |
2974 | } | |
2975 | spin_unlock(&pers_lock); | |
2976 | ||
2977 | if (pers == mddev->pers) { | |
2978 | /* Nothing to do! */ | |
2979 | module_put(pers->owner); | |
2980 | return rv; | |
2981 | } | |
2982 | if (!pers->takeover) { | |
2983 | module_put(pers->owner); | |
2984 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 2985 | mdname(mddev), clevel); |
245f46c2 N |
2986 | return -EINVAL; |
2987 | } | |
2988 | ||
e93f68a1 N |
2989 | list_for_each_entry(rdev, &mddev->disks, same_set) |
2990 | rdev->new_raid_disk = rdev->raid_disk; | |
2991 | ||
245f46c2 N |
2992 | /* ->takeover must set new_* and/or delta_disks |
2993 | * if it succeeds, and may set them when it fails. | |
2994 | */ | |
2995 | priv = pers->takeover(mddev); | |
2996 | if (IS_ERR(priv)) { | |
2997 | mddev->new_level = mddev->level; | |
2998 | mddev->new_layout = mddev->layout; | |
664e7c41 | 2999 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3000 | mddev->raid_disks -= mddev->delta_disks; |
3001 | mddev->delta_disks = 0; | |
3002 | module_put(pers->owner); | |
3003 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3004 | mdname(mddev), clevel); |
245f46c2 N |
3005 | return PTR_ERR(priv); |
3006 | } | |
3007 | ||
3008 | /* Looks like we have a winner */ | |
3009 | mddev_suspend(mddev); | |
3010 | mddev->pers->stop(mddev); | |
a64c876f N |
3011 | |
3012 | if (mddev->pers->sync_request == NULL && | |
3013 | pers->sync_request != NULL) { | |
3014 | /* need to add the md_redundancy_group */ | |
3015 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3016 | printk(KERN_WARNING | |
3017 | "md: cannot register extra attributes for %s\n", | |
3018 | mdname(mddev)); | |
19fdb9ee | 3019 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action"); |
a64c876f N |
3020 | } |
3021 | if (mddev->pers->sync_request != NULL && | |
3022 | pers->sync_request == NULL) { | |
3023 | /* need to remove the md_redundancy_group */ | |
3024 | if (mddev->to_remove == NULL) | |
3025 | mddev->to_remove = &md_redundancy_group; | |
3026 | } | |
3027 | ||
54071b38 TM |
3028 | if (mddev->pers->sync_request == NULL && |
3029 | mddev->external) { | |
3030 | /* We are converting from a no-redundancy array | |
3031 | * to a redundancy array and metadata is managed | |
3032 | * externally so we need to be sure that writes | |
3033 | * won't block due to a need to transition | |
3034 | * clean->dirty | |
3035 | * until external management is started. | |
3036 | */ | |
3037 | mddev->in_sync = 0; | |
3038 | mddev->safemode_delay = 0; | |
3039 | mddev->safemode = 0; | |
3040 | } | |
3041 | ||
e93f68a1 N |
3042 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
3043 | char nm[20]; | |
3044 | if (rdev->raid_disk < 0) | |
3045 | continue; | |
3046 | if (rdev->new_raid_disk > mddev->raid_disks) | |
3047 | rdev->new_raid_disk = -1; | |
3048 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3049 | continue; | |
3050 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3051 | sysfs_remove_link(&mddev->kobj, nm); | |
3052 | } | |
3053 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
3054 | if (rdev->raid_disk < 0) | |
3055 | continue; | |
3056 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3057 | continue; | |
3058 | rdev->raid_disk = rdev->new_raid_disk; | |
3059 | if (rdev->raid_disk < 0) | |
3a981b03 | 3060 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 N |
3061 | else { |
3062 | char nm[20]; | |
3063 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3064 | if(sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) | |
3065 | printk("md: cannot register %s for %s after level change\n", | |
3066 | nm, mdname(mddev)); | |
3a981b03 | 3067 | } |
e93f68a1 N |
3068 | } |
3069 | ||
3070 | module_put(mddev->pers->owner); | |
245f46c2 N |
3071 | mddev->pers = pers; |
3072 | mddev->private = priv; | |
3073 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3074 | mddev->level = mddev->new_level; | |
3075 | mddev->layout = mddev->new_layout; | |
664e7c41 | 3076 | mddev->chunk_sectors = mddev->new_chunk_sectors; |
245f46c2 | 3077 | mddev->delta_disks = 0; |
9af204cf TM |
3078 | if (mddev->pers->sync_request == NULL) { |
3079 | /* this is now an array without redundancy, so | |
3080 | * it must always be in_sync | |
3081 | */ | |
3082 | mddev->in_sync = 1; | |
3083 | del_timer_sync(&mddev->safemode_timer); | |
3084 | } | |
245f46c2 N |
3085 | pers->run(mddev); |
3086 | mddev_resume(mddev); | |
3087 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
3088 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3089 | md_wakeup_thread(mddev->thread); | |
5cac7861 | 3090 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3091 | md_new_event(mddev); |
d9d166c2 N |
3092 | return rv; |
3093 | } | |
3094 | ||
3095 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3096 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3097 | |
d4dbd025 N |
3098 | |
3099 | static ssize_t | |
3100 | layout_show(mddev_t *mddev, char *page) | |
3101 | { | |
3102 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3103 | if (mddev->reshape_position != MaxSector && |
3104 | mddev->layout != mddev->new_layout) | |
3105 | return sprintf(page, "%d (%d)\n", | |
3106 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3107 | return sprintf(page, "%d\n", mddev->layout); |
3108 | } | |
3109 | ||
3110 | static ssize_t | |
3111 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
3112 | { | |
3113 | char *e; | |
3114 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
3115 | |
3116 | if (!*buf || (*e && *e != '\n')) | |
3117 | return -EINVAL; | |
3118 | ||
b3546035 N |
3119 | if (mddev->pers) { |
3120 | int err; | |
50ac168a | 3121 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3122 | return -EBUSY; |
597a711b | 3123 | mddev->new_layout = n; |
50ac168a | 3124 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3125 | if (err) { |
3126 | mddev->new_layout = mddev->layout; | |
b3546035 | 3127 | return err; |
597a711b | 3128 | } |
b3546035 | 3129 | } else { |
08a02ecd | 3130 | mddev->new_layout = n; |
b3546035 N |
3131 | if (mddev->reshape_position == MaxSector) |
3132 | mddev->layout = n; | |
3133 | } | |
d4dbd025 N |
3134 | return len; |
3135 | } | |
3136 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3137 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
3138 | |
3139 | ||
eae1701f | 3140 | static ssize_t |
96de1e66 | 3141 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 3142 | { |
bb636547 N |
3143 | if (mddev->raid_disks == 0) |
3144 | return 0; | |
08a02ecd N |
3145 | if (mddev->reshape_position != MaxSector && |
3146 | mddev->delta_disks != 0) | |
3147 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3148 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3149 | return sprintf(page, "%d\n", mddev->raid_disks); |
3150 | } | |
3151 | ||
da943b99 N |
3152 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
3153 | ||
3154 | static ssize_t | |
3155 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
3156 | { | |
da943b99 N |
3157 | char *e; |
3158 | int rv = 0; | |
3159 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3160 | ||
3161 | if (!*buf || (*e && *e != '\n')) | |
3162 | return -EINVAL; | |
3163 | ||
3164 | if (mddev->pers) | |
3165 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
3166 | else if (mddev->reshape_position != MaxSector) { |
3167 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
3168 | mddev->delta_disks = n - olddisks; | |
3169 | mddev->raid_disks = n; | |
3170 | } else | |
da943b99 N |
3171 | mddev->raid_disks = n; |
3172 | return rv ? rv : len; | |
3173 | } | |
3174 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3175 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3176 | |
3b34380a N |
3177 | static ssize_t |
3178 | chunk_size_show(mddev_t *mddev, char *page) | |
3179 | { | |
08a02ecd | 3180 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3181 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3182 | return sprintf(page, "%d (%d)\n", | |
3183 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3184 | mddev->chunk_sectors << 9); |
3185 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3186 | } |
3187 | ||
3188 | static ssize_t | |
3189 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
3190 | { | |
3b34380a N |
3191 | char *e; |
3192 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3193 | ||
3b34380a N |
3194 | if (!*buf || (*e && *e != '\n')) |
3195 | return -EINVAL; | |
3196 | ||
b3546035 N |
3197 | if (mddev->pers) { |
3198 | int err; | |
50ac168a | 3199 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3200 | return -EBUSY; |
597a711b | 3201 | mddev->new_chunk_sectors = n >> 9; |
50ac168a | 3202 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3203 | if (err) { |
3204 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
b3546035 | 3205 | return err; |
597a711b | 3206 | } |
b3546035 | 3207 | } else { |
664e7c41 | 3208 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3209 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3210 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3211 | } |
3b34380a N |
3212 | return len; |
3213 | } | |
3214 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3215 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3216 | |
a94213b1 N |
3217 | static ssize_t |
3218 | resync_start_show(mddev_t *mddev, char *page) | |
3219 | { | |
d1a7c503 N |
3220 | if (mddev->recovery_cp == MaxSector) |
3221 | return sprintf(page, "none\n"); | |
a94213b1 N |
3222 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3223 | } | |
3224 | ||
3225 | static ssize_t | |
3226 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
3227 | { | |
a94213b1 N |
3228 | char *e; |
3229 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3230 | ||
3231 | if (mddev->pers) | |
3232 | return -EBUSY; | |
06e3c817 DW |
3233 | if (cmd_match(buf, "none")) |
3234 | n = MaxSector; | |
3235 | else if (!*buf || (*e && *e != '\n')) | |
a94213b1 N |
3236 | return -EINVAL; |
3237 | ||
3238 | mddev->recovery_cp = n; | |
3239 | return len; | |
3240 | } | |
3241 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 3242 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 3243 | |
9e653b63 N |
3244 | /* |
3245 | * The array state can be: | |
3246 | * | |
3247 | * clear | |
3248 | * No devices, no size, no level | |
3249 | * Equivalent to STOP_ARRAY ioctl | |
3250 | * inactive | |
3251 | * May have some settings, but array is not active | |
3252 | * all IO results in error | |
3253 | * When written, doesn't tear down array, but just stops it | |
3254 | * suspended (not supported yet) | |
3255 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3256 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3257 | * readonly |
3258 | * no resync can happen. no superblocks get written. | |
3259 | * write requests fail | |
3260 | * read-auto | |
3261 | * like readonly, but behaves like 'clean' on a write request. | |
3262 | * | |
3263 | * clean - no pending writes, but otherwise active. | |
3264 | * When written to inactive array, starts without resync | |
3265 | * If a write request arrives then | |
3266 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3267 | * if not known, block and switch to write-pending | |
3268 | * If written to an active array that has pending writes, then fails. | |
3269 | * active | |
3270 | * fully active: IO and resync can be happening. | |
3271 | * When written to inactive array, starts with resync | |
3272 | * | |
3273 | * write-pending | |
3274 | * clean, but writes are blocked waiting for 'active' to be written. | |
3275 | * | |
3276 | * active-idle | |
3277 | * like active, but no writes have been seen for a while (100msec). | |
3278 | * | |
3279 | */ | |
3280 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3281 | write_pending, active_idle, bad_word}; | |
05381954 | 3282 | static char *array_states[] = { |
9e653b63 N |
3283 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3284 | "write-pending", "active-idle", NULL }; | |
3285 | ||
3286 | static int match_word(const char *word, char **list) | |
3287 | { | |
3288 | int n; | |
3289 | for (n=0; list[n]; n++) | |
3290 | if (cmd_match(word, list[n])) | |
3291 | break; | |
3292 | return n; | |
3293 | } | |
3294 | ||
3295 | static ssize_t | |
3296 | array_state_show(mddev_t *mddev, char *page) | |
3297 | { | |
3298 | enum array_state st = inactive; | |
3299 | ||
3300 | if (mddev->pers) | |
3301 | switch(mddev->ro) { | |
3302 | case 1: | |
3303 | st = readonly; | |
3304 | break; | |
3305 | case 2: | |
3306 | st = read_auto; | |
3307 | break; | |
3308 | case 0: | |
3309 | if (mddev->in_sync) | |
3310 | st = clean; | |
070dc6dd | 3311 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3312 | st = write_pending; |
9e653b63 N |
3313 | else if (mddev->safemode) |
3314 | st = active_idle; | |
3315 | else | |
3316 | st = active; | |
3317 | } | |
3318 | else { | |
3319 | if (list_empty(&mddev->disks) && | |
3320 | mddev->raid_disks == 0 && | |
58c0fed4 | 3321 | mddev->dev_sectors == 0) |
9e653b63 N |
3322 | st = clear; |
3323 | else | |
3324 | st = inactive; | |
3325 | } | |
3326 | return sprintf(page, "%s\n", array_states[st]); | |
3327 | } | |
3328 | ||
df5b20cf | 3329 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
a4bd82d0 | 3330 | static int md_set_readonly(mddev_t * mddev, int is_open); |
9e653b63 N |
3331 | static int do_md_run(mddev_t * mddev); |
3332 | static int restart_array(mddev_t *mddev); | |
3333 | ||
3334 | static ssize_t | |
3335 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
3336 | { | |
3337 | int err = -EINVAL; | |
3338 | enum array_state st = match_word(buf, array_states); | |
3339 | switch(st) { | |
3340 | case bad_word: | |
3341 | break; | |
3342 | case clear: | |
3343 | /* stopping an active array */ | |
f2ea68cf | 3344 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 3345 | return -EBUSY; |
df5b20cf | 3346 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
3347 | break; |
3348 | case inactive: | |
3349 | /* stopping an active array */ | |
3350 | if (mddev->pers) { | |
f2ea68cf | 3351 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 3352 | return -EBUSY; |
df5b20cf | 3353 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
3354 | } else |
3355 | err = 0; /* already inactive */ | |
9e653b63 N |
3356 | break; |
3357 | case suspended: | |
3358 | break; /* not supported yet */ | |
3359 | case readonly: | |
3360 | if (mddev->pers) | |
a4bd82d0 | 3361 | err = md_set_readonly(mddev, 0); |
9e653b63 N |
3362 | else { |
3363 | mddev->ro = 1; | |
648b629e | 3364 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3365 | err = do_md_run(mddev); |
3366 | } | |
3367 | break; | |
3368 | case read_auto: | |
9e653b63 | 3369 | if (mddev->pers) { |
80268ee9 | 3370 | if (mddev->ro == 0) |
a4bd82d0 | 3371 | err = md_set_readonly(mddev, 0); |
80268ee9 | 3372 | else if (mddev->ro == 1) |
648b629e N |
3373 | err = restart_array(mddev); |
3374 | if (err == 0) { | |
3375 | mddev->ro = 2; | |
3376 | set_disk_ro(mddev->gendisk, 0); | |
3377 | } | |
9e653b63 N |
3378 | } else { |
3379 | mddev->ro = 2; | |
3380 | err = do_md_run(mddev); | |
3381 | } | |
3382 | break; | |
3383 | case clean: | |
3384 | if (mddev->pers) { | |
3385 | restart_array(mddev); | |
3386 | spin_lock_irq(&mddev->write_lock); | |
3387 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
3388 | if (mddev->in_sync == 0) { |
3389 | mddev->in_sync = 1; | |
31a59e34 N |
3390 | if (mddev->safemode == 1) |
3391 | mddev->safemode = 0; | |
070dc6dd | 3392 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3393 | } |
3394 | err = 0; | |
3395 | } else | |
3396 | err = -EBUSY; | |
9e653b63 | 3397 | spin_unlock_irq(&mddev->write_lock); |
5bf29597 N |
3398 | } else |
3399 | err = -EINVAL; | |
9e653b63 N |
3400 | break; |
3401 | case active: | |
3402 | if (mddev->pers) { | |
3403 | restart_array(mddev); | |
070dc6dd | 3404 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
3405 | wake_up(&mddev->sb_wait); |
3406 | err = 0; | |
3407 | } else { | |
3408 | mddev->ro = 0; | |
648b629e | 3409 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3410 | err = do_md_run(mddev); |
3411 | } | |
3412 | break; | |
3413 | case write_pending: | |
3414 | case active_idle: | |
3415 | /* these cannot be set */ | |
3416 | break; | |
3417 | } | |
3418 | if (err) | |
3419 | return err; | |
0fd62b86 | 3420 | else { |
00bcb4ac | 3421 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
9e653b63 | 3422 | return len; |
0fd62b86 | 3423 | } |
9e653b63 | 3424 | } |
80ca3a44 N |
3425 | static struct md_sysfs_entry md_array_state = |
3426 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 3427 | |
1e50915f RB |
3428 | static ssize_t |
3429 | max_corrected_read_errors_show(mddev_t *mddev, char *page) { | |
3430 | return sprintf(page, "%d\n", | |
3431 | atomic_read(&mddev->max_corr_read_errors)); | |
3432 | } | |
3433 | ||
3434 | static ssize_t | |
3435 | max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len) | |
3436 | { | |
3437 | char *e; | |
3438 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3439 | ||
3440 | if (*buf && (*e == 0 || *e == '\n')) { | |
3441 | atomic_set(&mddev->max_corr_read_errors, n); | |
3442 | return len; | |
3443 | } | |
3444 | return -EINVAL; | |
3445 | } | |
3446 | ||
3447 | static struct md_sysfs_entry max_corr_read_errors = | |
3448 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3449 | max_corrected_read_errors_store); | |
3450 | ||
6d7ff738 N |
3451 | static ssize_t |
3452 | null_show(mddev_t *mddev, char *page) | |
3453 | { | |
3454 | return -EINVAL; | |
3455 | } | |
3456 | ||
3457 | static ssize_t | |
3458 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
3459 | { | |
3460 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3461 | /* The new device is added to the array. | |
3462 | * If the array has a persistent superblock, we read the | |
3463 | * superblock to initialise info and check validity. | |
3464 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3465 | * which mainly checks size. | |
3466 | */ | |
3467 | char *e; | |
3468 | int major = simple_strtoul(buf, &e, 10); | |
3469 | int minor; | |
3470 | dev_t dev; | |
3471 | mdk_rdev_t *rdev; | |
3472 | int err; | |
3473 | ||
3474 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3475 | return -EINVAL; | |
3476 | minor = simple_strtoul(e+1, &e, 10); | |
3477 | if (*e && *e != '\n') | |
3478 | return -EINVAL; | |
3479 | dev = MKDEV(major, minor); | |
3480 | if (major != MAJOR(dev) || | |
3481 | minor != MINOR(dev)) | |
3482 | return -EOVERFLOW; | |
3483 | ||
3484 | ||
3485 | if (mddev->persistent) { | |
3486 | rdev = md_import_device(dev, mddev->major_version, | |
3487 | mddev->minor_version); | |
3488 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3489 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
3490 | mdk_rdev_t, same_set); | |
3491 | err = super_types[mddev->major_version] | |
3492 | .load_super(rdev, rdev0, mddev->minor_version); | |
3493 | if (err < 0) | |
3494 | goto out; | |
3495 | } | |
c5d79adb N |
3496 | } else if (mddev->external) |
3497 | rdev = md_import_device(dev, -2, -1); | |
3498 | else | |
6d7ff738 N |
3499 | rdev = md_import_device(dev, -1, -1); |
3500 | ||
3501 | if (IS_ERR(rdev)) | |
3502 | return PTR_ERR(rdev); | |
3503 | err = bind_rdev_to_array(rdev, mddev); | |
3504 | out: | |
3505 | if (err) | |
3506 | export_rdev(rdev); | |
3507 | return err ? err : len; | |
3508 | } | |
3509 | ||
3510 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 3511 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 3512 | |
9b1d1dac PC |
3513 | static ssize_t |
3514 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
3515 | { | |
3516 | char *end; | |
3517 | unsigned long chunk, end_chunk; | |
3518 | ||
3519 | if (!mddev->bitmap) | |
3520 | goto out; | |
3521 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3522 | while (*buf) { | |
3523 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3524 | if (buf == end) break; | |
3525 | if (*end == '-') { /* range */ | |
3526 | buf = end + 1; | |
3527 | end_chunk = simple_strtoul(buf, &end, 0); | |
3528 | if (buf == end) break; | |
3529 | } | |
3530 | if (*end && !isspace(*end)) break; | |
3531 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 3532 | buf = skip_spaces(end); |
9b1d1dac PC |
3533 | } |
3534 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3535 | out: | |
3536 | return len; | |
3537 | } | |
3538 | ||
3539 | static struct md_sysfs_entry md_bitmap = | |
3540 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3541 | ||
a35b0d69 N |
3542 | static ssize_t |
3543 | size_show(mddev_t *mddev, char *page) | |
3544 | { | |
58c0fed4 AN |
3545 | return sprintf(page, "%llu\n", |
3546 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3547 | } |
3548 | ||
d71f9f88 | 3549 | static int update_size(mddev_t *mddev, sector_t num_sectors); |
a35b0d69 N |
3550 | |
3551 | static ssize_t | |
3552 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
3553 | { | |
3554 | /* If array is inactive, we can reduce the component size, but | |
3555 | * not increase it (except from 0). | |
3556 | * If array is active, we can try an on-line resize | |
3557 | */ | |
b522adcd DW |
3558 | sector_t sectors; |
3559 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 3560 | |
58c0fed4 AN |
3561 | if (err < 0) |
3562 | return err; | |
a35b0d69 | 3563 | if (mddev->pers) { |
58c0fed4 | 3564 | err = update_size(mddev, sectors); |
850b2b42 | 3565 | md_update_sb(mddev, 1); |
a35b0d69 | 3566 | } else { |
58c0fed4 AN |
3567 | if (mddev->dev_sectors == 0 || |
3568 | mddev->dev_sectors > sectors) | |
3569 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
3570 | else |
3571 | err = -ENOSPC; | |
3572 | } | |
3573 | return err ? err : len; | |
3574 | } | |
3575 | ||
3576 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3577 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3578 | |
8bb93aac N |
3579 | |
3580 | /* Metdata version. | |
e691063a N |
3581 | * This is one of |
3582 | * 'none' for arrays with no metadata (good luck...) | |
3583 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
3584 | * or N.M for internally known formats |
3585 | */ | |
3586 | static ssize_t | |
3587 | metadata_show(mddev_t *mddev, char *page) | |
3588 | { | |
3589 | if (mddev->persistent) | |
3590 | return sprintf(page, "%d.%d\n", | |
3591 | mddev->major_version, mddev->minor_version); | |
e691063a N |
3592 | else if (mddev->external) |
3593 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
3594 | else |
3595 | return sprintf(page, "none\n"); | |
3596 | } | |
3597 | ||
3598 | static ssize_t | |
3599 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
3600 | { | |
3601 | int major, minor; | |
3602 | char *e; | |
ea43ddd8 N |
3603 | /* Changing the details of 'external' metadata is |
3604 | * always permitted. Otherwise there must be | |
3605 | * no devices attached to the array. | |
3606 | */ | |
3607 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3608 | ; | |
3609 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
3610 | return -EBUSY; |
3611 | ||
3612 | if (cmd_match(buf, "none")) { | |
3613 | mddev->persistent = 0; | |
e691063a N |
3614 | mddev->external = 0; |
3615 | mddev->major_version = 0; | |
3616 | mddev->minor_version = 90; | |
3617 | return len; | |
3618 | } | |
3619 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 3620 | size_t namelen = len-9; |
e691063a N |
3621 | if (namelen >= sizeof(mddev->metadata_type)) |
3622 | namelen = sizeof(mddev->metadata_type)-1; | |
3623 | strncpy(mddev->metadata_type, buf+9, namelen); | |
3624 | mddev->metadata_type[namelen] = 0; | |
3625 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
3626 | mddev->metadata_type[--namelen] = 0; | |
3627 | mddev->persistent = 0; | |
3628 | mddev->external = 1; | |
8bb93aac N |
3629 | mddev->major_version = 0; |
3630 | mddev->minor_version = 90; | |
3631 | return len; | |
3632 | } | |
3633 | major = simple_strtoul(buf, &e, 10); | |
3634 | if (e==buf || *e != '.') | |
3635 | return -EINVAL; | |
3636 | buf = e+1; | |
3637 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 3638 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 3639 | return -EINVAL; |
50511da3 | 3640 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
3641 | return -ENOENT; |
3642 | mddev->major_version = major; | |
3643 | mddev->minor_version = minor; | |
3644 | mddev->persistent = 1; | |
e691063a | 3645 | mddev->external = 0; |
8bb93aac N |
3646 | return len; |
3647 | } | |
3648 | ||
3649 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 3650 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 3651 | |
24dd469d | 3652 | static ssize_t |
7eec314d | 3653 | action_show(mddev_t *mddev, char *page) |
24dd469d | 3654 | { |
7eec314d | 3655 | char *type = "idle"; |
b6a9ce68 N |
3656 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
3657 | type = "frozen"; | |
3658 | else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
2b12ab6d | 3659 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
3660 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3661 | type = "reshape"; | |
3662 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
3663 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
3664 | type = "resync"; | |
3665 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
3666 | type = "check"; | |
3667 | else | |
3668 | type = "repair"; | |
72a23c21 | 3669 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
3670 | type = "recover"; |
3671 | } | |
3672 | return sprintf(page, "%s\n", type); | |
3673 | } | |
3674 | ||
3675 | static ssize_t | |
7eec314d | 3676 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 3677 | { |
7eec314d N |
3678 | if (!mddev->pers || !mddev->pers->sync_request) |
3679 | return -EINVAL; | |
3680 | ||
b6a9ce68 N |
3681 | if (cmd_match(page, "frozen")) |
3682 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3683 | else | |
3684 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3685 | ||
3686 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
7eec314d N |
3687 | if (mddev->sync_thread) { |
3688 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3689 | md_unregister_thread(mddev->sync_thread); | |
3690 | mddev->sync_thread = NULL; | |
3691 | mddev->recovery = 0; | |
3692 | } | |
03c902e1 N |
3693 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
3694 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 3695 | return -EBUSY; |
72a23c21 NB |
3696 | else if (cmd_match(page, "resync")) |
3697 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3698 | else if (cmd_match(page, "recover")) { | |
3699 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 3700 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 3701 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
3702 | int err; |
3703 | if (mddev->pers->start_reshape == NULL) | |
3704 | return -EINVAL; | |
3705 | err = mddev->pers->start_reshape(mddev); | |
3706 | if (err) | |
3707 | return err; | |
a99ac971 | 3708 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 3709 | } else { |
bce74dac | 3710 | if (cmd_match(page, "check")) |
7eec314d | 3711 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 3712 | else if (!cmd_match(page, "repair")) |
7eec314d N |
3713 | return -EINVAL; |
3714 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
3715 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 3716 | } |
03c902e1 | 3717 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 3718 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 3719 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
3720 | return len; |
3721 | } | |
3722 | ||
9d88883e | 3723 | static ssize_t |
96de1e66 | 3724 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
3725 | { |
3726 | return sprintf(page, "%llu\n", | |
3727 | (unsigned long long) mddev->resync_mismatches); | |
3728 | } | |
3729 | ||
80ca3a44 N |
3730 | static struct md_sysfs_entry md_scan_mode = |
3731 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 3732 | |
96de1e66 | 3733 | |
80ca3a44 | 3734 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 3735 | |
88202a0c N |
3736 | static ssize_t |
3737 | sync_min_show(mddev_t *mddev, char *page) | |
3738 | { | |
3739 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
3740 | mddev->sync_speed_min ? "local": "system"); | |
3741 | } | |
3742 | ||
3743 | static ssize_t | |
3744 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
3745 | { | |
3746 | int min; | |
3747 | char *e; | |
3748 | if (strncmp(buf, "system", 6)==0) { | |
3749 | mddev->sync_speed_min = 0; | |
3750 | return len; | |
3751 | } | |
3752 | min = simple_strtoul(buf, &e, 10); | |
3753 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
3754 | return -EINVAL; | |
3755 | mddev->sync_speed_min = min; | |
3756 | return len; | |
3757 | } | |
3758 | ||
3759 | static struct md_sysfs_entry md_sync_min = | |
3760 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
3761 | ||
3762 | static ssize_t | |
3763 | sync_max_show(mddev_t *mddev, char *page) | |
3764 | { | |
3765 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
3766 | mddev->sync_speed_max ? "local": "system"); | |
3767 | } | |
3768 | ||
3769 | static ssize_t | |
3770 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
3771 | { | |
3772 | int max; | |
3773 | char *e; | |
3774 | if (strncmp(buf, "system", 6)==0) { | |
3775 | mddev->sync_speed_max = 0; | |
3776 | return len; | |
3777 | } | |
3778 | max = simple_strtoul(buf, &e, 10); | |
3779 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
3780 | return -EINVAL; | |
3781 | mddev->sync_speed_max = max; | |
3782 | return len; | |
3783 | } | |
3784 | ||
3785 | static struct md_sysfs_entry md_sync_max = | |
3786 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
3787 | ||
d7f3d291 IP |
3788 | static ssize_t |
3789 | degraded_show(mddev_t *mddev, char *page) | |
3790 | { | |
3791 | return sprintf(page, "%d\n", mddev->degraded); | |
3792 | } | |
3793 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 3794 | |
90b08710 BS |
3795 | static ssize_t |
3796 | sync_force_parallel_show(mddev_t *mddev, char *page) | |
3797 | { | |
3798 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
3799 | } | |
3800 | ||
3801 | static ssize_t | |
3802 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) | |
3803 | { | |
3804 | long n; | |
3805 | ||
3806 | if (strict_strtol(buf, 10, &n)) | |
3807 | return -EINVAL; | |
3808 | ||
3809 | if (n != 0 && n != 1) | |
3810 | return -EINVAL; | |
3811 | ||
3812 | mddev->parallel_resync = n; | |
3813 | ||
3814 | if (mddev->sync_thread) | |
3815 | wake_up(&resync_wait); | |
3816 | ||
3817 | return len; | |
3818 | } | |
3819 | ||
3820 | /* force parallel resync, even with shared block devices */ | |
3821 | static struct md_sysfs_entry md_sync_force_parallel = | |
3822 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
3823 | sync_force_parallel_show, sync_force_parallel_store); | |
3824 | ||
88202a0c N |
3825 | static ssize_t |
3826 | sync_speed_show(mddev_t *mddev, char *page) | |
3827 | { | |
3828 | unsigned long resync, dt, db; | |
d1a7c503 N |
3829 | if (mddev->curr_resync == 0) |
3830 | return sprintf(page, "none\n"); | |
9687a60c AN |
3831 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
3832 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 3833 | if (!dt) dt++; |
9687a60c AN |
3834 | db = resync - mddev->resync_mark_cnt; |
3835 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
3836 | } |
3837 | ||
80ca3a44 | 3838 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
3839 | |
3840 | static ssize_t | |
3841 | sync_completed_show(mddev_t *mddev, char *page) | |
3842 | { | |
58c0fed4 | 3843 | unsigned long max_sectors, resync; |
88202a0c | 3844 | |
acb180b0 N |
3845 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
3846 | return sprintf(page, "none\n"); | |
3847 | ||
88202a0c | 3848 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
58c0fed4 | 3849 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 3850 | else |
58c0fed4 | 3851 | max_sectors = mddev->dev_sectors; |
88202a0c | 3852 | |
acb180b0 | 3853 | resync = mddev->curr_resync_completed; |
58c0fed4 | 3854 | return sprintf(page, "%lu / %lu\n", resync, max_sectors); |
88202a0c N |
3855 | } |
3856 | ||
80ca3a44 | 3857 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 3858 | |
5e96ee65 NB |
3859 | static ssize_t |
3860 | min_sync_show(mddev_t *mddev, char *page) | |
3861 | { | |
3862 | return sprintf(page, "%llu\n", | |
3863 | (unsigned long long)mddev->resync_min); | |
3864 | } | |
3865 | static ssize_t | |
3866 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3867 | { | |
3868 | unsigned long long min; | |
3869 | if (strict_strtoull(buf, 10, &min)) | |
3870 | return -EINVAL; | |
3871 | if (min > mddev->resync_max) | |
3872 | return -EINVAL; | |
3873 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3874 | return -EBUSY; | |
3875 | ||
3876 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 3877 | if (mddev->chunk_sectors) { |
2ac06c33 | 3878 | sector_t temp = min; |
9d8f0363 | 3879 | if (sector_div(temp, mddev->chunk_sectors)) |
5e96ee65 NB |
3880 | return -EINVAL; |
3881 | } | |
3882 | mddev->resync_min = min; | |
3883 | ||
3884 | return len; | |
3885 | } | |
3886 | ||
3887 | static struct md_sysfs_entry md_min_sync = | |
3888 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
3889 | ||
c6207277 N |
3890 | static ssize_t |
3891 | max_sync_show(mddev_t *mddev, char *page) | |
3892 | { | |
3893 | if (mddev->resync_max == MaxSector) | |
3894 | return sprintf(page, "max\n"); | |
3895 | else | |
3896 | return sprintf(page, "%llu\n", | |
3897 | (unsigned long long)mddev->resync_max); | |
3898 | } | |
3899 | static ssize_t | |
3900 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3901 | { | |
3902 | if (strncmp(buf, "max", 3) == 0) | |
3903 | mddev->resync_max = MaxSector; | |
3904 | else { | |
5e96ee65 NB |
3905 | unsigned long long max; |
3906 | if (strict_strtoull(buf, 10, &max)) | |
3907 | return -EINVAL; | |
3908 | if (max < mddev->resync_min) | |
c6207277 N |
3909 | return -EINVAL; |
3910 | if (max < mddev->resync_max && | |
4d484a4a | 3911 | mddev->ro == 0 && |
c6207277 N |
3912 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
3913 | return -EBUSY; | |
3914 | ||
3915 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 3916 | if (mddev->chunk_sectors) { |
2ac06c33 | 3917 | sector_t temp = max; |
9d8f0363 | 3918 | if (sector_div(temp, mddev->chunk_sectors)) |
c6207277 N |
3919 | return -EINVAL; |
3920 | } | |
3921 | mddev->resync_max = max; | |
3922 | } | |
3923 | wake_up(&mddev->recovery_wait); | |
3924 | return len; | |
3925 | } | |
3926 | ||
3927 | static struct md_sysfs_entry md_max_sync = | |
3928 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
3929 | ||
e464eafd N |
3930 | static ssize_t |
3931 | suspend_lo_show(mddev_t *mddev, char *page) | |
3932 | { | |
3933 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
3934 | } | |
3935 | ||
3936 | static ssize_t | |
3937 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
3938 | { | |
3939 | char *e; | |
3940 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3941 | ||
b8d966ef N |
3942 | if (mddev->pers == NULL || |
3943 | mddev->pers->quiesce == NULL) | |
e464eafd N |
3944 | return -EINVAL; |
3945 | if (buf == e || (*e && *e != '\n')) | |
3946 | return -EINVAL; | |
3947 | if (new >= mddev->suspend_hi || | |
3948 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
3949 | mddev->suspend_lo = new; | |
3950 | mddev->pers->quiesce(mddev, 2); | |
3951 | return len; | |
3952 | } else | |
3953 | return -EINVAL; | |
3954 | } | |
3955 | static struct md_sysfs_entry md_suspend_lo = | |
3956 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
3957 | ||
3958 | ||
3959 | static ssize_t | |
3960 | suspend_hi_show(mddev_t *mddev, char *page) | |
3961 | { | |
3962 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
3963 | } | |
3964 | ||
3965 | static ssize_t | |
3966 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
3967 | { | |
3968 | char *e; | |
3969 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3970 | ||
b8d966ef N |
3971 | if (mddev->pers == NULL || |
3972 | mddev->pers->quiesce == NULL) | |
e464eafd N |
3973 | return -EINVAL; |
3974 | if (buf == e || (*e && *e != '\n')) | |
3975 | return -EINVAL; | |
3976 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
3977 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
3978 | mddev->suspend_hi = new; | |
3979 | mddev->pers->quiesce(mddev, 1); | |
3980 | mddev->pers->quiesce(mddev, 0); | |
3981 | return len; | |
3982 | } else | |
3983 | return -EINVAL; | |
3984 | } | |
3985 | static struct md_sysfs_entry md_suspend_hi = | |
3986 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
3987 | ||
08a02ecd N |
3988 | static ssize_t |
3989 | reshape_position_show(mddev_t *mddev, char *page) | |
3990 | { | |
3991 | if (mddev->reshape_position != MaxSector) | |
3992 | return sprintf(page, "%llu\n", | |
3993 | (unsigned long long)mddev->reshape_position); | |
3994 | strcpy(page, "none\n"); | |
3995 | return 5; | |
3996 | } | |
3997 | ||
3998 | static ssize_t | |
3999 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
4000 | { | |
4001 | char *e; | |
4002 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4003 | if (mddev->pers) | |
4004 | return -EBUSY; | |
4005 | if (buf == e || (*e && *e != '\n')) | |
4006 | return -EINVAL; | |
4007 | mddev->reshape_position = new; | |
4008 | mddev->delta_disks = 0; | |
4009 | mddev->new_level = mddev->level; | |
4010 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4011 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
08a02ecd N |
4012 | return len; |
4013 | } | |
4014 | ||
4015 | static struct md_sysfs_entry md_reshape_position = | |
4016 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4017 | reshape_position_store); | |
4018 | ||
b522adcd DW |
4019 | static ssize_t |
4020 | array_size_show(mddev_t *mddev, char *page) | |
4021 | { | |
4022 | if (mddev->external_size) | |
4023 | return sprintf(page, "%llu\n", | |
4024 | (unsigned long long)mddev->array_sectors/2); | |
4025 | else | |
4026 | return sprintf(page, "default\n"); | |
4027 | } | |
4028 | ||
4029 | static ssize_t | |
4030 | array_size_store(mddev_t *mddev, const char *buf, size_t len) | |
4031 | { | |
4032 | sector_t sectors; | |
4033 | ||
4034 | if (strncmp(buf, "default", 7) == 0) { | |
4035 | if (mddev->pers) | |
4036 | sectors = mddev->pers->size(mddev, 0, 0); | |
4037 | else | |
4038 | sectors = mddev->array_sectors; | |
4039 | ||
4040 | mddev->external_size = 0; | |
4041 | } else { | |
4042 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
4043 | return -EINVAL; | |
4044 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
2b69c839 | 4045 | return -E2BIG; |
b522adcd DW |
4046 | |
4047 | mddev->external_size = 1; | |
4048 | } | |
4049 | ||
4050 | mddev->array_sectors = sectors; | |
4051 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e N |
4052 | if (mddev->pers) |
4053 | revalidate_disk(mddev->gendisk); | |
b522adcd DW |
4054 | |
4055 | return len; | |
4056 | } | |
4057 | ||
4058 | static struct md_sysfs_entry md_array_size = | |
4059 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4060 | array_size_store); | |
e464eafd | 4061 | |
eae1701f N |
4062 | static struct attribute *md_default_attrs[] = { |
4063 | &md_level.attr, | |
d4dbd025 | 4064 | &md_layout.attr, |
eae1701f | 4065 | &md_raid_disks.attr, |
3b34380a | 4066 | &md_chunk_size.attr, |
a35b0d69 | 4067 | &md_size.attr, |
a94213b1 | 4068 | &md_resync_start.attr, |
8bb93aac | 4069 | &md_metadata.attr, |
6d7ff738 | 4070 | &md_new_device.attr, |
16f17b39 | 4071 | &md_safe_delay.attr, |
9e653b63 | 4072 | &md_array_state.attr, |
08a02ecd | 4073 | &md_reshape_position.attr, |
b522adcd | 4074 | &md_array_size.attr, |
1e50915f | 4075 | &max_corr_read_errors.attr, |
411036fa N |
4076 | NULL, |
4077 | }; | |
4078 | ||
4079 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4080 | &md_scan_mode.attr, |
9d88883e | 4081 | &md_mismatches.attr, |
88202a0c N |
4082 | &md_sync_min.attr, |
4083 | &md_sync_max.attr, | |
4084 | &md_sync_speed.attr, | |
90b08710 | 4085 | &md_sync_force_parallel.attr, |
88202a0c | 4086 | &md_sync_completed.attr, |
5e96ee65 | 4087 | &md_min_sync.attr, |
c6207277 | 4088 | &md_max_sync.attr, |
e464eafd N |
4089 | &md_suspend_lo.attr, |
4090 | &md_suspend_hi.attr, | |
9b1d1dac | 4091 | &md_bitmap.attr, |
d7f3d291 | 4092 | &md_degraded.attr, |
eae1701f N |
4093 | NULL, |
4094 | }; | |
411036fa N |
4095 | static struct attribute_group md_redundancy_group = { |
4096 | .name = NULL, | |
4097 | .attrs = md_redundancy_attrs, | |
4098 | }; | |
4099 | ||
eae1701f N |
4100 | |
4101 | static ssize_t | |
4102 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4103 | { | |
4104 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
4105 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 4106 | ssize_t rv; |
eae1701f N |
4107 | |
4108 | if (!entry->show) | |
4109 | return -EIO; | |
5dc5cf7d IM |
4110 | rv = mddev_lock(mddev); |
4111 | if (!rv) { | |
4112 | rv = entry->show(mddev, page); | |
4113 | mddev_unlock(mddev); | |
4114 | } | |
96de1e66 | 4115 | return rv; |
eae1701f N |
4116 | } |
4117 | ||
4118 | static ssize_t | |
4119 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4120 | const char *page, size_t length) | |
4121 | { | |
4122 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
4123 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 4124 | ssize_t rv; |
eae1701f N |
4125 | |
4126 | if (!entry->store) | |
4127 | return -EIO; | |
67463acb N |
4128 | if (!capable(CAP_SYS_ADMIN)) |
4129 | return -EACCES; | |
5dc5cf7d | 4130 | rv = mddev_lock(mddev); |
d3374825 N |
4131 | if (mddev->hold_active == UNTIL_IOCTL) |
4132 | mddev->hold_active = 0; | |
5dc5cf7d IM |
4133 | if (!rv) { |
4134 | rv = entry->store(mddev, page, length); | |
4135 | mddev_unlock(mddev); | |
4136 | } | |
96de1e66 | 4137 | return rv; |
eae1701f N |
4138 | } |
4139 | ||
4140 | static void md_free(struct kobject *ko) | |
4141 | { | |
4142 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
a21d1504 N |
4143 | |
4144 | if (mddev->sysfs_state) | |
4145 | sysfs_put(mddev->sysfs_state); | |
4146 | ||
4147 | if (mddev->gendisk) { | |
4148 | del_gendisk(mddev->gendisk); | |
4149 | put_disk(mddev->gendisk); | |
4150 | } | |
4151 | if (mddev->queue) | |
4152 | blk_cleanup_queue(mddev->queue); | |
4153 | ||
eae1701f N |
4154 | kfree(mddev); |
4155 | } | |
4156 | ||
52cf25d0 | 4157 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4158 | .show = md_attr_show, |
4159 | .store = md_attr_store, | |
4160 | }; | |
4161 | static struct kobj_type md_ktype = { | |
4162 | .release = md_free, | |
4163 | .sysfs_ops = &md_sysfs_ops, | |
4164 | .default_attrs = md_default_attrs, | |
4165 | }; | |
4166 | ||
1da177e4 LT |
4167 | int mdp_major = 0; |
4168 | ||
5fd3a17e DW |
4169 | static void mddev_delayed_delete(struct work_struct *ws) |
4170 | { | |
4171 | mddev_t *mddev = container_of(ws, mddev_t, del_work); | |
4172 | ||
43a70507 | 4173 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4174 | kobject_del(&mddev->kobj); |
4175 | kobject_put(&mddev->kobj); | |
4176 | } | |
4177 | ||
efeb53c0 | 4178 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4179 | { |
48c9c27b | 4180 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
4181 | mddev_t *mddev = mddev_find(dev); |
4182 | struct gendisk *disk; | |
efeb53c0 N |
4183 | int partitioned; |
4184 | int shift; | |
4185 | int unit; | |
3830c62f | 4186 | int error; |
1da177e4 LT |
4187 | |
4188 | if (!mddev) | |
efeb53c0 N |
4189 | return -ENODEV; |
4190 | ||
4191 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4192 | shift = partitioned ? MdpMinorShift : 0; | |
4193 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4194 | |
d3374825 N |
4195 | /* wait for any previous instance if this device |
4196 | * to be completed removed (mddev_delayed_delete). | |
4197 | */ | |
4198 | flush_scheduled_work(); | |
4199 | ||
48c9c27b | 4200 | mutex_lock(&disks_mutex); |
0909dc44 N |
4201 | error = -EEXIST; |
4202 | if (mddev->gendisk) | |
4203 | goto abort; | |
efeb53c0 N |
4204 | |
4205 | if (name) { | |
4206 | /* Need to ensure that 'name' is not a duplicate. | |
4207 | */ | |
4208 | mddev_t *mddev2; | |
4209 | spin_lock(&all_mddevs_lock); | |
4210 | ||
4211 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4212 | if (mddev2->gendisk && | |
4213 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4214 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4215 | goto abort; |
efeb53c0 N |
4216 | } |
4217 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4218 | } |
8b765398 | 4219 | |
0909dc44 | 4220 | error = -ENOMEM; |
8b765398 | 4221 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4222 | if (!mddev->queue) |
4223 | goto abort; | |
409c57f3 N |
4224 | mddev->queue->queuedata = mddev; |
4225 | ||
8b765398 N |
4226 | /* Can be unlocked because the queue is new: no concurrency */ |
4227 | queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue); | |
4228 | ||
409c57f3 | 4229 | blk_queue_make_request(mddev->queue, md_make_request); |
8b765398 | 4230 | |
1da177e4 LT |
4231 | disk = alloc_disk(1 << shift); |
4232 | if (!disk) { | |
8b765398 N |
4233 | blk_cleanup_queue(mddev->queue); |
4234 | mddev->queue = NULL; | |
0909dc44 | 4235 | goto abort; |
1da177e4 | 4236 | } |
efeb53c0 | 4237 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4238 | disk->first_minor = unit << shift; |
efeb53c0 N |
4239 | if (name) |
4240 | strcpy(disk->disk_name, name); | |
4241 | else if (partitioned) | |
1da177e4 | 4242 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4243 | else |
1da177e4 | 4244 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4245 | disk->fops = &md_fops; |
4246 | disk->private_data = mddev; | |
4247 | disk->queue = mddev->queue; | |
92850bbd | 4248 | /* Allow extended partitions. This makes the |
d3374825 | 4249 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4250 | * remove it now. |
4251 | */ | |
4252 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 LT |
4253 | add_disk(disk); |
4254 | mddev->gendisk = disk; | |
ed9e1982 TH |
4255 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4256 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4257 | if (error) { |
4258 | /* This isn't possible, but as kobject_init_and_add is marked | |
4259 | * __must_check, we must do something with the result | |
4260 | */ | |
5e55e2f5 N |
4261 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4262 | disk->disk_name); | |
0909dc44 N |
4263 | error = 0; |
4264 | } | |
00bcb4ac N |
4265 | if (mddev->kobj.sd && |
4266 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 4267 | printk(KERN_DEBUG "pointless warning\n"); |
0909dc44 N |
4268 | abort: |
4269 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 4270 | if (!error && mddev->kobj.sd) { |
3830c62f | 4271 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 4272 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 4273 | } |
d3374825 | 4274 | mddev_put(mddev); |
0909dc44 | 4275 | return error; |
efeb53c0 N |
4276 | } |
4277 | ||
4278 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4279 | { | |
4280 | md_alloc(dev, NULL); | |
1da177e4 LT |
4281 | return NULL; |
4282 | } | |
4283 | ||
efeb53c0 N |
4284 | static int add_named_array(const char *val, struct kernel_param *kp) |
4285 | { | |
4286 | /* val must be "md_*" where * is not all digits. | |
4287 | * We allocate an array with a large free minor number, and | |
4288 | * set the name to val. val must not already be an active name. | |
4289 | */ | |
4290 | int len = strlen(val); | |
4291 | char buf[DISK_NAME_LEN]; | |
4292 | ||
4293 | while (len && val[len-1] == '\n') | |
4294 | len--; | |
4295 | if (len >= DISK_NAME_LEN) | |
4296 | return -E2BIG; | |
4297 | strlcpy(buf, val, len+1); | |
4298 | if (strncmp(buf, "md_", 3) != 0) | |
4299 | return -EINVAL; | |
4300 | return md_alloc(0, buf); | |
4301 | } | |
4302 | ||
1da177e4 LT |
4303 | static void md_safemode_timeout(unsigned long data) |
4304 | { | |
4305 | mddev_t *mddev = (mddev_t *) data; | |
4306 | ||
0fd62b86 NB |
4307 | if (!atomic_read(&mddev->writes_pending)) { |
4308 | mddev->safemode = 1; | |
4309 | if (mddev->external) | |
00bcb4ac | 4310 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4311 | } |
1da177e4 LT |
4312 | md_wakeup_thread(mddev->thread); |
4313 | } | |
4314 | ||
6ff8d8ec | 4315 | static int start_dirty_degraded; |
1da177e4 | 4316 | |
390ee602 | 4317 | int md_run(mddev_t *mddev) |
1da177e4 | 4318 | { |
2604b703 | 4319 | int err; |
1da177e4 | 4320 | mdk_rdev_t *rdev; |
2604b703 | 4321 | struct mdk_personality *pers; |
1da177e4 | 4322 | |
a757e64c N |
4323 | if (list_empty(&mddev->disks)) |
4324 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4325 | return -EINVAL; |
1da177e4 LT |
4326 | |
4327 | if (mddev->pers) | |
4328 | return -EBUSY; | |
bb4f1e9d N |
4329 | /* Cannot run until previous stop completes properly */ |
4330 | if (mddev->sysfs_active) | |
4331 | return -EBUSY; | |
b6eb127d | 4332 | |
1da177e4 LT |
4333 | /* |
4334 | * Analyze all RAID superblock(s) | |
4335 | */ | |
1ec4a939 N |
4336 | if (!mddev->raid_disks) { |
4337 | if (!mddev->persistent) | |
4338 | return -EINVAL; | |
a757e64c | 4339 | analyze_sbs(mddev); |
1ec4a939 | 4340 | } |
1da177e4 | 4341 | |
d9d166c2 N |
4342 | if (mddev->level != LEVEL_NONE) |
4343 | request_module("md-level-%d", mddev->level); | |
4344 | else if (mddev->clevel[0]) | |
4345 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4346 | |
4347 | /* | |
4348 | * Drop all container device buffers, from now on | |
4349 | * the only valid external interface is through the md | |
4350 | * device. | |
1da177e4 | 4351 | */ |
159ec1fc | 4352 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 4353 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4354 | continue; |
4355 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4356 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4357 | |
4358 | /* perform some consistency tests on the device. | |
4359 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4360 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4361 | */ |
0f420358 | 4362 | if (rdev->data_offset < rdev->sb_start) { |
58c0fed4 AN |
4363 | if (mddev->dev_sectors && |
4364 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4365 | > rdev->sb_start) { |
f0d76d70 N |
4366 | printk("md: %s: data overlaps metadata\n", |
4367 | mdname(mddev)); | |
4368 | return -EINVAL; | |
4369 | } | |
4370 | } else { | |
0f420358 | 4371 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4372 | > rdev->data_offset) { |
4373 | printk("md: %s: metadata overlaps data\n", | |
4374 | mdname(mddev)); | |
4375 | return -EINVAL; | |
4376 | } | |
4377 | } | |
00bcb4ac | 4378 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
4379 | } |
4380 | ||
1da177e4 | 4381 | spin_lock(&pers_lock); |
d9d166c2 | 4382 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 4383 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 4384 | spin_unlock(&pers_lock); |
d9d166c2 N |
4385 | if (mddev->level != LEVEL_NONE) |
4386 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
4387 | mddev->level); | |
4388 | else | |
4389 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
4390 | mddev->clevel); | |
1da177e4 LT |
4391 | return -EINVAL; |
4392 | } | |
2604b703 | 4393 | mddev->pers = pers; |
1da177e4 | 4394 | spin_unlock(&pers_lock); |
34817e8c N |
4395 | if (mddev->level != pers->level) { |
4396 | mddev->level = pers->level; | |
4397 | mddev->new_level = pers->level; | |
4398 | } | |
d9d166c2 | 4399 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 4400 | |
f6705578 | 4401 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 4402 | pers->start_reshape == NULL) { |
f6705578 N |
4403 | /* This personality cannot handle reshaping... */ |
4404 | mddev->pers = NULL; | |
4405 | module_put(pers->owner); | |
4406 | return -EINVAL; | |
4407 | } | |
4408 | ||
7dd5e7c3 N |
4409 | if (pers->sync_request) { |
4410 | /* Warn if this is a potentially silly | |
4411 | * configuration. | |
4412 | */ | |
4413 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4414 | mdk_rdev_t *rdev2; | |
7dd5e7c3 | 4415 | int warned = 0; |
159ec1fc CR |
4416 | |
4417 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
4418 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
7dd5e7c3 N |
4419 | if (rdev < rdev2 && |
4420 | rdev->bdev->bd_contains == | |
4421 | rdev2->bdev->bd_contains) { | |
4422 | printk(KERN_WARNING | |
4423 | "%s: WARNING: %s appears to be" | |
4424 | " on the same physical disk as" | |
4425 | " %s.\n", | |
4426 | mdname(mddev), | |
4427 | bdevname(rdev->bdev,b), | |
4428 | bdevname(rdev2->bdev,b2)); | |
4429 | warned = 1; | |
4430 | } | |
4431 | } | |
159ec1fc | 4432 | |
7dd5e7c3 N |
4433 | if (warned) |
4434 | printk(KERN_WARNING | |
4435 | "True protection against single-disk" | |
4436 | " failure might be compromised.\n"); | |
4437 | } | |
4438 | ||
657390d2 | 4439 | mddev->recovery = 0; |
58c0fed4 AN |
4440 | /* may be over-ridden by personality */ |
4441 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4442 | ||
6ff8d8ec | 4443 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 4444 | |
0f9552b5 | 4445 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
4446 | mddev->ro = 2; /* read-only, but switch on first write */ |
4447 | ||
b15c2e57 | 4448 | err = mddev->pers->run(mddev); |
13e53df3 AN |
4449 | if (err) |
4450 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
b522adcd DW |
4451 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
4452 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
4453 | " but 'external_size' not in effect?\n", __func__); | |
4454 | printk(KERN_ERR | |
4455 | "md: invalid array_size %llu > default size %llu\n", | |
4456 | (unsigned long long)mddev->array_sectors / 2, | |
4457 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
4458 | err = -EINVAL; | |
4459 | mddev->pers->stop(mddev); | |
4460 | } | |
4461 | if (err == 0 && mddev->pers->sync_request) { | |
b15c2e57 N |
4462 | err = bitmap_create(mddev); |
4463 | if (err) { | |
4464 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
4465 | mdname(mddev), err); | |
4466 | mddev->pers->stop(mddev); | |
4467 | } | |
4468 | } | |
1da177e4 | 4469 | if (err) { |
1da177e4 LT |
4470 | module_put(mddev->pers->owner); |
4471 | mddev->pers = NULL; | |
32a7627c N |
4472 | bitmap_destroy(mddev); |
4473 | return err; | |
1da177e4 | 4474 | } |
5e55e2f5 | 4475 | if (mddev->pers->sync_request) { |
00bcb4ac N |
4476 | if (mddev->kobj.sd && |
4477 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
4478 | printk(KERN_WARNING |
4479 | "md: cannot register extra attributes for %s\n", | |
4480 | mdname(mddev)); | |
00bcb4ac | 4481 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 4482 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
4483 | mddev->ro = 0; |
4484 | ||
1da177e4 | 4485 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
4486 | atomic_set(&mddev->max_corr_read_errors, |
4487 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
4488 | mddev->safemode = 0; |
4489 | mddev->safemode_timer.function = md_safemode_timeout; | |
4490 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 4491 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 4492 | mddev->in_sync = 1; |
86e6ffdd | 4493 | |
159ec1fc | 4494 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
4495 | if (rdev->raid_disk >= 0) { |
4496 | char nm[20]; | |
4497 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 | 4498 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
00bcb4ac | 4499 | /* failure here is OK */; |
86e6ffdd | 4500 | } |
1da177e4 LT |
4501 | |
4502 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4503 | ||
850b2b42 N |
4504 | if (mddev->flags) |
4505 | md_update_sb(mddev, 0); | |
1da177e4 | 4506 | |
0b8c9de0 N |
4507 | md_wakeup_thread(mddev->thread); |
4508 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 4509 | |
d7603b7e | 4510 | md_new_event(mddev); |
00bcb4ac N |
4511 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
4512 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 4513 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
4514 | return 0; |
4515 | } | |
390ee602 | 4516 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 4517 | |
fe60b014 N |
4518 | static int do_md_run(mddev_t *mddev) |
4519 | { | |
4520 | int err; | |
4521 | ||
4522 | err = md_run(mddev); | |
4523 | if (err) | |
4524 | goto out; | |
69e51b44 N |
4525 | err = bitmap_load(mddev); |
4526 | if (err) { | |
4527 | bitmap_destroy(mddev); | |
4528 | goto out; | |
4529 | } | |
fe60b014 N |
4530 | set_capacity(mddev->gendisk, mddev->array_sectors); |
4531 | revalidate_disk(mddev->gendisk); | |
4532 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); | |
4533 | out: | |
4534 | return err; | |
4535 | } | |
4536 | ||
1da177e4 LT |
4537 | static int restart_array(mddev_t *mddev) |
4538 | { | |
4539 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 4540 | |
80fab1d7 | 4541 | /* Complain if it has no devices */ |
1da177e4 | 4542 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
4543 | return -ENXIO; |
4544 | if (!mddev->pers) | |
4545 | return -EINVAL; | |
4546 | if (!mddev->ro) | |
4547 | return -EBUSY; | |
4548 | mddev->safemode = 0; | |
4549 | mddev->ro = 0; | |
4550 | set_disk_ro(disk, 0); | |
4551 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
4552 | mdname(mddev)); | |
4553 | /* Kick recovery or resync if necessary */ | |
4554 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4555 | md_wakeup_thread(mddev->thread); | |
4556 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 4557 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 4558 | return 0; |
1da177e4 LT |
4559 | } |
4560 | ||
acc55e22 N |
4561 | /* similar to deny_write_access, but accounts for our holding a reference |
4562 | * to the file ourselves */ | |
4563 | static int deny_bitmap_write_access(struct file * file) | |
4564 | { | |
4565 | struct inode *inode = file->f_mapping->host; | |
4566 | ||
4567 | spin_lock(&inode->i_lock); | |
4568 | if (atomic_read(&inode->i_writecount) > 1) { | |
4569 | spin_unlock(&inode->i_lock); | |
4570 | return -ETXTBSY; | |
4571 | } | |
4572 | atomic_set(&inode->i_writecount, -1); | |
4573 | spin_unlock(&inode->i_lock); | |
4574 | ||
4575 | return 0; | |
4576 | } | |
4577 | ||
43a70507 | 4578 | void restore_bitmap_write_access(struct file *file) |
acc55e22 N |
4579 | { |
4580 | struct inode *inode = file->f_mapping->host; | |
4581 | ||
4582 | spin_lock(&inode->i_lock); | |
4583 | atomic_set(&inode->i_writecount, 1); | |
4584 | spin_unlock(&inode->i_lock); | |
4585 | } | |
4586 | ||
6177b472 N |
4587 | static void md_clean(mddev_t *mddev) |
4588 | { | |
4589 | mddev->array_sectors = 0; | |
4590 | mddev->external_size = 0; | |
4591 | mddev->dev_sectors = 0; | |
4592 | mddev->raid_disks = 0; | |
4593 | mddev->recovery_cp = 0; | |
4594 | mddev->resync_min = 0; | |
4595 | mddev->resync_max = MaxSector; | |
4596 | mddev->reshape_position = MaxSector; | |
4597 | mddev->external = 0; | |
4598 | mddev->persistent = 0; | |
4599 | mddev->level = LEVEL_NONE; | |
4600 | mddev->clevel[0] = 0; | |
4601 | mddev->flags = 0; | |
4602 | mddev->ro = 0; | |
4603 | mddev->metadata_type[0] = 0; | |
4604 | mddev->chunk_sectors = 0; | |
4605 | mddev->ctime = mddev->utime = 0; | |
4606 | mddev->layout = 0; | |
4607 | mddev->max_disks = 0; | |
4608 | mddev->events = 0; | |
a8707c08 | 4609 | mddev->can_decrease_events = 0; |
6177b472 N |
4610 | mddev->delta_disks = 0; |
4611 | mddev->new_level = LEVEL_NONE; | |
4612 | mddev->new_layout = 0; | |
4613 | mddev->new_chunk_sectors = 0; | |
4614 | mddev->curr_resync = 0; | |
4615 | mddev->resync_mismatches = 0; | |
4616 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
4617 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
4618 | mddev->recovery = 0; | |
4619 | mddev->in_sync = 0; | |
4620 | mddev->degraded = 0; | |
6177b472 N |
4621 | mddev->safemode = 0; |
4622 | mddev->bitmap_info.offset = 0; | |
4623 | mddev->bitmap_info.default_offset = 0; | |
4624 | mddev->bitmap_info.chunksize = 0; | |
4625 | mddev->bitmap_info.daemon_sleep = 0; | |
4626 | mddev->bitmap_info.max_write_behind = 0; | |
252ac522 | 4627 | mddev->plug = NULL; |
6177b472 N |
4628 | } |
4629 | ||
390ee602 | 4630 | void md_stop_writes(mddev_t *mddev) |
a047e125 N |
4631 | { |
4632 | if (mddev->sync_thread) { | |
4633 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4634 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
4635 | md_unregister_thread(mddev->sync_thread); | |
4636 | mddev->sync_thread = NULL; | |
4637 | } | |
4638 | ||
4639 | del_timer_sync(&mddev->safemode_timer); | |
4640 | ||
4641 | bitmap_flush(mddev); | |
4642 | md_super_wait(mddev); | |
4643 | ||
4644 | if (!mddev->in_sync || mddev->flags) { | |
4645 | /* mark array as shutdown cleanly */ | |
4646 | mddev->in_sync = 1; | |
4647 | md_update_sb(mddev, 1); | |
4648 | } | |
4649 | } | |
390ee602 | 4650 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 4651 | |
390ee602 | 4652 | void md_stop(mddev_t *mddev) |
6177b472 N |
4653 | { |
4654 | mddev->pers->stop(mddev); | |
4655 | if (mddev->pers->sync_request && mddev->to_remove == NULL) | |
4656 | mddev->to_remove = &md_redundancy_group; | |
4657 | module_put(mddev->pers->owner); | |
4658 | mddev->pers = NULL; | |
cca9cf90 | 4659 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 4660 | } |
390ee602 | 4661 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 4662 | |
a4bd82d0 N |
4663 | static int md_set_readonly(mddev_t *mddev, int is_open) |
4664 | { | |
4665 | int err = 0; | |
4666 | mutex_lock(&mddev->open_mutex); | |
4667 | if (atomic_read(&mddev->openers) > is_open) { | |
4668 | printk("md: %s still in use.\n",mdname(mddev)); | |
4669 | err = -EBUSY; | |
4670 | goto out; | |
4671 | } | |
4672 | if (mddev->pers) { | |
4673 | md_stop_writes(mddev); | |
4674 | ||
4675 | err = -ENXIO; | |
4676 | if (mddev->ro==1) | |
4677 | goto out; | |
4678 | mddev->ro = 1; | |
4679 | set_disk_ro(mddev->gendisk, 1); | |
4680 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
00bcb4ac | 4681 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
a4bd82d0 N |
4682 | err = 0; |
4683 | } | |
4684 | out: | |
4685 | mutex_unlock(&mddev->open_mutex); | |
4686 | return err; | |
4687 | } | |
4688 | ||
9e653b63 N |
4689 | /* mode: |
4690 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
4691 | * 2 - stop but do not disassemble array |
4692 | */ | |
df5b20cf | 4693 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
1da177e4 | 4694 | { |
1da177e4 | 4695 | struct gendisk *disk = mddev->gendisk; |
c4647292 | 4696 | mdk_rdev_t *rdev; |
1da177e4 | 4697 | |
c8c00a69 | 4698 | mutex_lock(&mddev->open_mutex); |
bb4f1e9d N |
4699 | if (atomic_read(&mddev->openers) > is_open || |
4700 | mddev->sysfs_active) { | |
df5b20cf | 4701 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 N |
4702 | mutex_unlock(&mddev->open_mutex); |
4703 | return -EBUSY; | |
4704 | } | |
1da177e4 | 4705 | |
6e17b027 | 4706 | if (mddev->pers) { |
a4bd82d0 N |
4707 | if (mddev->ro) |
4708 | set_disk_ro(disk, 0); | |
409c57f3 | 4709 | |
390ee602 | 4710 | md_stop_writes(mddev); |
a4bd82d0 N |
4711 | md_stop(mddev); |
4712 | mddev->queue->merge_bvec_fn = NULL; | |
4713 | mddev->queue->unplug_fn = NULL; | |
4714 | mddev->queue->backing_dev_info.congested_fn = NULL; | |
6177b472 | 4715 | |
a4bd82d0 | 4716 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 4717 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 4718 | |
a4bd82d0 N |
4719 | list_for_each_entry(rdev, &mddev->disks, same_set) |
4720 | if (rdev->raid_disk >= 0) { | |
4721 | char nm[20]; | |
4722 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4723 | sysfs_remove_link(&mddev->kobj, nm); | |
4724 | } | |
c4647292 | 4725 | |
a4bd82d0 | 4726 | set_capacity(disk, 0); |
6e17b027 | 4727 | mutex_unlock(&mddev->open_mutex); |
a4bd82d0 | 4728 | revalidate_disk(disk); |
0d4ca600 | 4729 | |
a4bd82d0 N |
4730 | if (mddev->ro) |
4731 | mddev->ro = 0; | |
6e17b027 N |
4732 | } else |
4733 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
4734 | /* |
4735 | * Free resources if final stop | |
4736 | */ | |
9e653b63 | 4737 | if (mode == 0) { |
1da177e4 LT |
4738 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
4739 | ||
978f946b | 4740 | bitmap_destroy(mddev); |
c3d9714e N |
4741 | if (mddev->bitmap_info.file) { |
4742 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
4743 | fput(mddev->bitmap_info.file); | |
4744 | mddev->bitmap_info.file = NULL; | |
978f946b | 4745 | } |
c3d9714e | 4746 | mddev->bitmap_info.offset = 0; |
978f946b | 4747 | |
1da177e4 LT |
4748 | export_array(mddev); |
4749 | ||
6177b472 | 4750 | md_clean(mddev); |
934d9c23 | 4751 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
4752 | if (mddev->hold_active == UNTIL_STOP) |
4753 | mddev->hold_active = 0; | |
a4bd82d0 | 4754 | } |
3f9d99c1 | 4755 | blk_integrity_unregister(disk); |
d7603b7e | 4756 | md_new_event(mddev); |
00bcb4ac | 4757 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 4758 | return 0; |
1da177e4 LT |
4759 | } |
4760 | ||
fdee8ae4 | 4761 | #ifndef MODULE |
1da177e4 LT |
4762 | static void autorun_array(mddev_t *mddev) |
4763 | { | |
4764 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4765 | int err; |
4766 | ||
a757e64c | 4767 | if (list_empty(&mddev->disks)) |
1da177e4 | 4768 | return; |
1da177e4 LT |
4769 | |
4770 | printk(KERN_INFO "md: running: "); | |
4771 | ||
159ec1fc | 4772 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
4773 | char b[BDEVNAME_SIZE]; |
4774 | printk("<%s>", bdevname(rdev->bdev,b)); | |
4775 | } | |
4776 | printk("\n"); | |
4777 | ||
d710e138 | 4778 | err = do_md_run(mddev); |
1da177e4 LT |
4779 | if (err) { |
4780 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 4781 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
4782 | } |
4783 | } | |
4784 | ||
4785 | /* | |
4786 | * lets try to run arrays based on all disks that have arrived | |
4787 | * until now. (those are in pending_raid_disks) | |
4788 | * | |
4789 | * the method: pick the first pending disk, collect all disks with | |
4790 | * the same UUID, remove all from the pending list and put them into | |
4791 | * the 'same_array' list. Then order this list based on superblock | |
4792 | * update time (freshest comes first), kick out 'old' disks and | |
4793 | * compare superblocks. If everything's fine then run it. | |
4794 | * | |
4795 | * If "unit" is allocated, then bump its reference count | |
4796 | */ | |
4797 | static void autorun_devices(int part) | |
4798 | { | |
159ec1fc | 4799 | mdk_rdev_t *rdev0, *rdev, *tmp; |
1da177e4 LT |
4800 | mddev_t *mddev; |
4801 | char b[BDEVNAME_SIZE]; | |
4802 | ||
4803 | printk(KERN_INFO "md: autorun ...\n"); | |
4804 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 4805 | int unit; |
1da177e4 | 4806 | dev_t dev; |
ad01c9e3 | 4807 | LIST_HEAD(candidates); |
1da177e4 LT |
4808 | rdev0 = list_entry(pending_raid_disks.next, |
4809 | mdk_rdev_t, same_set); | |
4810 | ||
4811 | printk(KERN_INFO "md: considering %s ...\n", | |
4812 | bdevname(rdev0->bdev,b)); | |
4813 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 4814 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
4815 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
4816 | printk(KERN_INFO "md: adding %s ...\n", | |
4817 | bdevname(rdev->bdev,b)); | |
4818 | list_move(&rdev->same_set, &candidates); | |
4819 | } | |
4820 | /* | |
4821 | * now we have a set of devices, with all of them having | |
4822 | * mostly sane superblocks. It's time to allocate the | |
4823 | * mddev. | |
4824 | */ | |
e8703fe1 N |
4825 | if (part) { |
4826 | dev = MKDEV(mdp_major, | |
4827 | rdev0->preferred_minor << MdpMinorShift); | |
4828 | unit = MINOR(dev) >> MdpMinorShift; | |
4829 | } else { | |
4830 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
4831 | unit = MINOR(dev); | |
4832 | } | |
4833 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
4834 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
4835 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
4836 | break; | |
4837 | } | |
1da177e4 LT |
4838 | |
4839 | md_probe(dev, NULL, NULL); | |
4840 | mddev = mddev_find(dev); | |
9bbbca3a NB |
4841 | if (!mddev || !mddev->gendisk) { |
4842 | if (mddev) | |
4843 | mddev_put(mddev); | |
4844 | printk(KERN_ERR | |
1da177e4 LT |
4845 | "md: cannot allocate memory for md drive.\n"); |
4846 | break; | |
4847 | } | |
4848 | if (mddev_lock(mddev)) | |
4849 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
4850 | mdname(mddev)); | |
4851 | else if (mddev->raid_disks || mddev->major_version | |
4852 | || !list_empty(&mddev->disks)) { | |
4853 | printk(KERN_WARNING | |
4854 | "md: %s already running, cannot run %s\n", | |
4855 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
4856 | mddev_unlock(mddev); | |
4857 | } else { | |
4858 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 4859 | mddev->persistent = 1; |
159ec1fc | 4860 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
4861 | list_del_init(&rdev->same_set); |
4862 | if (bind_rdev_to_array(rdev, mddev)) | |
4863 | export_rdev(rdev); | |
4864 | } | |
4865 | autorun_array(mddev); | |
4866 | mddev_unlock(mddev); | |
4867 | } | |
4868 | /* on success, candidates will be empty, on error | |
4869 | * it won't... | |
4870 | */ | |
159ec1fc | 4871 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 4872 | list_del_init(&rdev->same_set); |
1da177e4 | 4873 | export_rdev(rdev); |
4b80991c | 4874 | } |
1da177e4 LT |
4875 | mddev_put(mddev); |
4876 | } | |
4877 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
4878 | } | |
fdee8ae4 | 4879 | #endif /* !MODULE */ |
1da177e4 | 4880 | |
1da177e4 LT |
4881 | static int get_version(void __user * arg) |
4882 | { | |
4883 | mdu_version_t ver; | |
4884 | ||
4885 | ver.major = MD_MAJOR_VERSION; | |
4886 | ver.minor = MD_MINOR_VERSION; | |
4887 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
4888 | ||
4889 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
4890 | return -EFAULT; | |
4891 | ||
4892 | return 0; | |
4893 | } | |
4894 | ||
4895 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
4896 | { | |
4897 | mdu_array_info_t info; | |
a9f326eb | 4898 | int nr,working,insync,failed,spare; |
1da177e4 | 4899 | mdk_rdev_t *rdev; |
1da177e4 | 4900 | |
a9f326eb | 4901 | nr=working=insync=failed=spare=0; |
159ec1fc | 4902 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 4903 | nr++; |
b2d444d7 | 4904 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4905 | failed++; |
4906 | else { | |
4907 | working++; | |
b2d444d7 | 4908 | if (test_bit(In_sync, &rdev->flags)) |
a9f326eb | 4909 | insync++; |
1da177e4 LT |
4910 | else |
4911 | spare++; | |
4912 | } | |
4913 | } | |
4914 | ||
4915 | info.major_version = mddev->major_version; | |
4916 | info.minor_version = mddev->minor_version; | |
4917 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
4918 | info.ctime = mddev->ctime; | |
4919 | info.level = mddev->level; | |
58c0fed4 AN |
4920 | info.size = mddev->dev_sectors / 2; |
4921 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 4922 | info.size = -1; |
1da177e4 LT |
4923 | info.nr_disks = nr; |
4924 | info.raid_disks = mddev->raid_disks; | |
4925 | info.md_minor = mddev->md_minor; | |
4926 | info.not_persistent= !mddev->persistent; | |
4927 | ||
4928 | info.utime = mddev->utime; | |
4929 | info.state = 0; | |
4930 | if (mddev->in_sync) | |
4931 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 4932 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 4933 | info.state = (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 4934 | info.active_disks = insync; |
1da177e4 LT |
4935 | info.working_disks = working; |
4936 | info.failed_disks = failed; | |
4937 | info.spare_disks = spare; | |
4938 | ||
4939 | info.layout = mddev->layout; | |
9d8f0363 | 4940 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
4941 | |
4942 | if (copy_to_user(arg, &info, sizeof(info))) | |
4943 | return -EFAULT; | |
4944 | ||
4945 | return 0; | |
4946 | } | |
4947 | ||
87162a28 | 4948 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
4949 | { |
4950 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
4951 | char *ptr, *buf = NULL; | |
4952 | int err = -ENOMEM; | |
4953 | ||
b5470dc5 DW |
4954 | if (md_allow_write(mddev)) |
4955 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
4956 | else | |
4957 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 4958 | |
32a7627c N |
4959 | if (!file) |
4960 | goto out; | |
4961 | ||
4962 | /* bitmap disabled, zero the first byte and copy out */ | |
4963 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
4964 | file->pathname[0] = '\0'; | |
4965 | goto copy_out; | |
4966 | } | |
4967 | ||
4968 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
4969 | if (!buf) | |
4970 | goto out; | |
4971 | ||
6bcfd601 CH |
4972 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
4973 | if (IS_ERR(ptr)) | |
32a7627c N |
4974 | goto out; |
4975 | ||
4976 | strcpy(file->pathname, ptr); | |
4977 | ||
4978 | copy_out: | |
4979 | err = 0; | |
4980 | if (copy_to_user(arg, file, sizeof(*file))) | |
4981 | err = -EFAULT; | |
4982 | out: | |
4983 | kfree(buf); | |
4984 | kfree(file); | |
4985 | return err; | |
4986 | } | |
4987 | ||
1da177e4 LT |
4988 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
4989 | { | |
4990 | mdu_disk_info_t info; | |
1da177e4 LT |
4991 | mdk_rdev_t *rdev; |
4992 | ||
4993 | if (copy_from_user(&info, arg, sizeof(info))) | |
4994 | return -EFAULT; | |
4995 | ||
26ef379f | 4996 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
4997 | if (rdev) { |
4998 | info.major = MAJOR(rdev->bdev->bd_dev); | |
4999 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5000 | info.raid_disk = rdev->raid_disk; | |
5001 | info.state = 0; | |
b2d444d7 | 5002 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5003 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5004 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5005 | info.state |= (1<<MD_DISK_ACTIVE); |
5006 | info.state |= (1<<MD_DISK_SYNC); | |
5007 | } | |
8ddf9efe N |
5008 | if (test_bit(WriteMostly, &rdev->flags)) |
5009 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5010 | } else { |
5011 | info.major = info.minor = 0; | |
5012 | info.raid_disk = -1; | |
5013 | info.state = (1<<MD_DISK_REMOVED); | |
5014 | } | |
5015 | ||
5016 | if (copy_to_user(arg, &info, sizeof(info))) | |
5017 | return -EFAULT; | |
5018 | ||
5019 | return 0; | |
5020 | } | |
5021 | ||
5022 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
5023 | { | |
5024 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
5025 | mdk_rdev_t *rdev; | |
5026 | dev_t dev = MKDEV(info->major,info->minor); | |
5027 | ||
5028 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
5029 | return -EOVERFLOW; | |
5030 | ||
5031 | if (!mddev->raid_disks) { | |
5032 | int err; | |
5033 | /* expecting a device which has a superblock */ | |
5034 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5035 | if (IS_ERR(rdev)) { | |
5036 | printk(KERN_WARNING | |
5037 | "md: md_import_device returned %ld\n", | |
5038 | PTR_ERR(rdev)); | |
5039 | return PTR_ERR(rdev); | |
5040 | } | |
5041 | if (!list_empty(&mddev->disks)) { | |
5042 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
5043 | mdk_rdev_t, same_set); | |
a9f326eb | 5044 | err = super_types[mddev->major_version] |
1da177e4 LT |
5045 | .load_super(rdev, rdev0, mddev->minor_version); |
5046 | if (err < 0) { | |
5047 | printk(KERN_WARNING | |
5048 | "md: %s has different UUID to %s\n", | |
5049 | bdevname(rdev->bdev,b), | |
5050 | bdevname(rdev0->bdev,b2)); | |
5051 | export_rdev(rdev); | |
5052 | return -EINVAL; | |
5053 | } | |
5054 | } | |
5055 | err = bind_rdev_to_array(rdev, mddev); | |
5056 | if (err) | |
5057 | export_rdev(rdev); | |
5058 | return err; | |
5059 | } | |
5060 | ||
5061 | /* | |
5062 | * add_new_disk can be used once the array is assembled | |
5063 | * to add "hot spares". They must already have a superblock | |
5064 | * written | |
5065 | */ | |
5066 | if (mddev->pers) { | |
5067 | int err; | |
5068 | if (!mddev->pers->hot_add_disk) { | |
5069 | printk(KERN_WARNING | |
5070 | "%s: personality does not support diskops!\n", | |
5071 | mdname(mddev)); | |
5072 | return -EINVAL; | |
5073 | } | |
7b1e35f6 N |
5074 | if (mddev->persistent) |
5075 | rdev = md_import_device(dev, mddev->major_version, | |
5076 | mddev->minor_version); | |
5077 | else | |
5078 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
5079 | if (IS_ERR(rdev)) { |
5080 | printk(KERN_WARNING | |
5081 | "md: md_import_device returned %ld\n", | |
5082 | PTR_ERR(rdev)); | |
5083 | return PTR_ERR(rdev); | |
5084 | } | |
41158c7e N |
5085 | /* set save_raid_disk if appropriate */ |
5086 | if (!mddev->persistent) { | |
5087 | if (info->state & (1<<MD_DISK_SYNC) && | |
5088 | info->raid_disk < mddev->raid_disks) | |
5089 | rdev->raid_disk = info->raid_disk; | |
5090 | else | |
5091 | rdev->raid_disk = -1; | |
5092 | } else | |
5093 | super_types[mddev->major_version]. | |
5094 | validate_super(mddev, rdev); | |
5095 | rdev->saved_raid_disk = rdev->raid_disk; | |
5096 | ||
b2d444d7 | 5097 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5098 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5099 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5100 | else |
5101 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5102 | |
1da177e4 LT |
5103 | rdev->raid_disk = -1; |
5104 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
5105 | if (!err && !mddev->pers->hot_remove_disk) { |
5106 | /* If there is hot_add_disk but no hot_remove_disk | |
5107 | * then added disks for geometry changes, | |
5108 | * and should be added immediately. | |
5109 | */ | |
5110 | super_types[mddev->major_version]. | |
5111 | validate_super(mddev, rdev); | |
5112 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
5113 | if (err) | |
5114 | unbind_rdev_from_array(rdev); | |
5115 | } | |
1da177e4 LT |
5116 | if (err) |
5117 | export_rdev(rdev); | |
52664732 | 5118 | else |
00bcb4ac | 5119 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c361777f | 5120 | |
17571284 | 5121 | md_update_sb(mddev, 1); |
72a23c21 NB |
5122 | if (mddev->degraded) |
5123 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 5124 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 5125 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
5126 | return err; |
5127 | } | |
5128 | ||
5129 | /* otherwise, add_new_disk is only allowed | |
5130 | * for major_version==0 superblocks | |
5131 | */ | |
5132 | if (mddev->major_version != 0) { | |
5133 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5134 | mdname(mddev)); | |
5135 | return -EINVAL; | |
5136 | } | |
5137 | ||
5138 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5139 | int err; | |
d710e138 | 5140 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5141 | if (IS_ERR(rdev)) { |
5142 | printk(KERN_WARNING | |
5143 | "md: error, md_import_device() returned %ld\n", | |
5144 | PTR_ERR(rdev)); | |
5145 | return PTR_ERR(rdev); | |
5146 | } | |
5147 | rdev->desc_nr = info->number; | |
5148 | if (info->raid_disk < mddev->raid_disks) | |
5149 | rdev->raid_disk = info->raid_disk; | |
5150 | else | |
5151 | rdev->raid_disk = -1; | |
5152 | ||
1da177e4 | 5153 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5154 | if (info->state & (1<<MD_DISK_SYNC)) |
5155 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5156 | |
8ddf9efe N |
5157 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5158 | set_bit(WriteMostly, &rdev->flags); | |
5159 | ||
1da177e4 LT |
5160 | if (!mddev->persistent) { |
5161 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
0f420358 | 5162 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 5163 | } else |
0f420358 | 5164 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
8190e754 | 5165 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5166 | |
2bf071bf N |
5167 | err = bind_rdev_to_array(rdev, mddev); |
5168 | if (err) { | |
5169 | export_rdev(rdev); | |
5170 | return err; | |
5171 | } | |
1da177e4 LT |
5172 | } |
5173 | ||
5174 | return 0; | |
5175 | } | |
5176 | ||
5177 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
5178 | { | |
5179 | char b[BDEVNAME_SIZE]; | |
5180 | mdk_rdev_t *rdev; | |
5181 | ||
1da177e4 LT |
5182 | rdev = find_rdev(mddev, dev); |
5183 | if (!rdev) | |
5184 | return -ENXIO; | |
5185 | ||
5186 | if (rdev->raid_disk >= 0) | |
5187 | goto busy; | |
5188 | ||
5189 | kick_rdev_from_array(rdev); | |
850b2b42 | 5190 | md_update_sb(mddev, 1); |
d7603b7e | 5191 | md_new_event(mddev); |
1da177e4 LT |
5192 | |
5193 | return 0; | |
5194 | busy: | |
fdefa4d8 | 5195 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5196 | bdevname(rdev->bdev,b), mdname(mddev)); |
5197 | return -EBUSY; | |
5198 | } | |
5199 | ||
5200 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
5201 | { | |
5202 | char b[BDEVNAME_SIZE]; | |
5203 | int err; | |
1da177e4 LT |
5204 | mdk_rdev_t *rdev; |
5205 | ||
5206 | if (!mddev->pers) | |
5207 | return -ENODEV; | |
5208 | ||
5209 | if (mddev->major_version != 0) { | |
5210 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5211 | " version-0 superblocks.\n", | |
5212 | mdname(mddev)); | |
5213 | return -EINVAL; | |
5214 | } | |
5215 | if (!mddev->pers->hot_add_disk) { | |
5216 | printk(KERN_WARNING | |
5217 | "%s: personality does not support diskops!\n", | |
5218 | mdname(mddev)); | |
5219 | return -EINVAL; | |
5220 | } | |
5221 | ||
d710e138 | 5222 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5223 | if (IS_ERR(rdev)) { |
5224 | printk(KERN_WARNING | |
5225 | "md: error, md_import_device() returned %ld\n", | |
5226 | PTR_ERR(rdev)); | |
5227 | return -EINVAL; | |
5228 | } | |
5229 | ||
5230 | if (mddev->persistent) | |
0f420358 | 5231 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 5232 | else |
0f420358 | 5233 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 5234 | |
8190e754 | 5235 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5236 | |
b2d444d7 | 5237 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5238 | printk(KERN_WARNING |
5239 | "md: can not hot-add faulty %s disk to %s!\n", | |
5240 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5241 | err = -EINVAL; | |
5242 | goto abort_export; | |
5243 | } | |
b2d444d7 | 5244 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5245 | rdev->desc_nr = -1; |
5842730d | 5246 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5247 | err = bind_rdev_to_array(rdev, mddev); |
5248 | if (err) | |
5249 | goto abort_export; | |
1da177e4 LT |
5250 | |
5251 | /* | |
5252 | * The rest should better be atomic, we can have disk failures | |
5253 | * noticed in interrupt contexts ... | |
5254 | */ | |
5255 | ||
1da177e4 LT |
5256 | rdev->raid_disk = -1; |
5257 | ||
850b2b42 | 5258 | md_update_sb(mddev, 1); |
1da177e4 LT |
5259 | |
5260 | /* | |
5261 | * Kick recovery, maybe this spare has to be added to the | |
5262 | * array immediately. | |
5263 | */ | |
5264 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5265 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5266 | md_new_event(mddev); |
1da177e4 LT |
5267 | return 0; |
5268 | ||
1da177e4 LT |
5269 | abort_export: |
5270 | export_rdev(rdev); | |
5271 | return err; | |
5272 | } | |
5273 | ||
32a7627c N |
5274 | static int set_bitmap_file(mddev_t *mddev, int fd) |
5275 | { | |
5276 | int err; | |
5277 | ||
36fa3063 N |
5278 | if (mddev->pers) { |
5279 | if (!mddev->pers->quiesce) | |
5280 | return -EBUSY; | |
5281 | if (mddev->recovery || mddev->sync_thread) | |
5282 | return -EBUSY; | |
5283 | /* we should be able to change the bitmap.. */ | |
5284 | } | |
32a7627c | 5285 | |
32a7627c | 5286 | |
36fa3063 N |
5287 | if (fd >= 0) { |
5288 | if (mddev->bitmap) | |
5289 | return -EEXIST; /* cannot add when bitmap is present */ | |
c3d9714e | 5290 | mddev->bitmap_info.file = fget(fd); |
32a7627c | 5291 | |
c3d9714e | 5292 | if (mddev->bitmap_info.file == NULL) { |
36fa3063 N |
5293 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
5294 | mdname(mddev)); | |
5295 | return -EBADF; | |
5296 | } | |
5297 | ||
c3d9714e | 5298 | err = deny_bitmap_write_access(mddev->bitmap_info.file); |
36fa3063 N |
5299 | if (err) { |
5300 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
5301 | mdname(mddev)); | |
c3d9714e N |
5302 | fput(mddev->bitmap_info.file); |
5303 | mddev->bitmap_info.file = NULL; | |
36fa3063 N |
5304 | return err; |
5305 | } | |
c3d9714e | 5306 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
5307 | } else if (mddev->bitmap == NULL) |
5308 | return -ENOENT; /* cannot remove what isn't there */ | |
5309 | err = 0; | |
5310 | if (mddev->pers) { | |
5311 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 5312 | if (fd >= 0) { |
36fa3063 | 5313 | err = bitmap_create(mddev); |
69e51b44 N |
5314 | if (!err) |
5315 | err = bitmap_load(mddev); | |
5316 | } | |
d7375ab3 | 5317 | if (fd < 0 || err) { |
36fa3063 | 5318 | bitmap_destroy(mddev); |
d7375ab3 N |
5319 | fd = -1; /* make sure to put the file */ |
5320 | } | |
36fa3063 | 5321 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
5322 | } |
5323 | if (fd < 0) { | |
c3d9714e N |
5324 | if (mddev->bitmap_info.file) { |
5325 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
5326 | fput(mddev->bitmap_info.file); | |
acc55e22 | 5327 | } |
c3d9714e | 5328 | mddev->bitmap_info.file = NULL; |
36fa3063 N |
5329 | } |
5330 | ||
32a7627c N |
5331 | return err; |
5332 | } | |
5333 | ||
1da177e4 LT |
5334 | /* |
5335 | * set_array_info is used two different ways | |
5336 | * The original usage is when creating a new array. | |
5337 | * In this usage, raid_disks is > 0 and it together with | |
5338 | * level, size, not_persistent,layout,chunksize determine the | |
5339 | * shape of the array. | |
5340 | * This will always create an array with a type-0.90.0 superblock. | |
5341 | * The newer usage is when assembling an array. | |
5342 | * In this case raid_disks will be 0, and the major_version field is | |
5343 | * use to determine which style super-blocks are to be found on the devices. | |
5344 | * The minor and patch _version numbers are also kept incase the | |
5345 | * super_block handler wishes to interpret them. | |
5346 | */ | |
5347 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
5348 | { | |
5349 | ||
5350 | if (info->raid_disks == 0) { | |
5351 | /* just setting version number for superblock loading */ | |
5352 | if (info->major_version < 0 || | |
50511da3 | 5353 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
5354 | super_types[info->major_version].name == NULL) { |
5355 | /* maybe try to auto-load a module? */ | |
5356 | printk(KERN_INFO | |
5357 | "md: superblock version %d not known\n", | |
5358 | info->major_version); | |
5359 | return -EINVAL; | |
5360 | } | |
5361 | mddev->major_version = info->major_version; | |
5362 | mddev->minor_version = info->minor_version; | |
5363 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 5364 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
5365 | /* ensure mddev_put doesn't delete this now that there |
5366 | * is some minimal configuration. | |
5367 | */ | |
5368 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
5369 | return 0; |
5370 | } | |
5371 | mddev->major_version = MD_MAJOR_VERSION; | |
5372 | mddev->minor_version = MD_MINOR_VERSION; | |
5373 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
5374 | mddev->ctime = get_seconds(); | |
5375 | ||
5376 | mddev->level = info->level; | |
17115e03 | 5377 | mddev->clevel[0] = 0; |
58c0fed4 | 5378 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
5379 | mddev->raid_disks = info->raid_disks; |
5380 | /* don't set md_minor, it is determined by which /dev/md* was | |
5381 | * openned | |
5382 | */ | |
5383 | if (info->state & (1<<MD_SB_CLEAN)) | |
5384 | mddev->recovery_cp = MaxSector; | |
5385 | else | |
5386 | mddev->recovery_cp = 0; | |
5387 | mddev->persistent = ! info->not_persistent; | |
e691063a | 5388 | mddev->external = 0; |
1da177e4 LT |
5389 | |
5390 | mddev->layout = info->layout; | |
9d8f0363 | 5391 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
5392 | |
5393 | mddev->max_disks = MD_SB_DISKS; | |
5394 | ||
e691063a N |
5395 | if (mddev->persistent) |
5396 | mddev->flags = 0; | |
850b2b42 | 5397 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5398 | |
c3d9714e N |
5399 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
5400 | mddev->bitmap_info.offset = 0; | |
b2a2703c | 5401 | |
f6705578 N |
5402 | mddev->reshape_position = MaxSector; |
5403 | ||
1da177e4 LT |
5404 | /* |
5405 | * Generate a 128 bit UUID | |
5406 | */ | |
5407 | get_random_bytes(mddev->uuid, 16); | |
5408 | ||
f6705578 | 5409 | mddev->new_level = mddev->level; |
664e7c41 | 5410 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
5411 | mddev->new_layout = mddev->layout; |
5412 | mddev->delta_disks = 0; | |
5413 | ||
1da177e4 LT |
5414 | return 0; |
5415 | } | |
5416 | ||
1f403624 DW |
5417 | void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors) |
5418 | { | |
b522adcd DW |
5419 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
5420 | ||
5421 | if (mddev->external_size) | |
5422 | return; | |
5423 | ||
1f403624 DW |
5424 | mddev->array_sectors = array_sectors; |
5425 | } | |
5426 | EXPORT_SYMBOL(md_set_array_sectors); | |
5427 | ||
d71f9f88 | 5428 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
a35b0d69 | 5429 | { |
159ec1fc | 5430 | mdk_rdev_t *rdev; |
a35b0d69 | 5431 | int rv; |
d71f9f88 | 5432 | int fit = (num_sectors == 0); |
a35b0d69 N |
5433 | |
5434 | if (mddev->pers->resize == NULL) | |
5435 | return -EINVAL; | |
d71f9f88 AN |
5436 | /* The "num_sectors" is the number of sectors of each device that |
5437 | * is used. This can only make sense for arrays with redundancy. | |
5438 | * linear and raid0 always use whatever space is available. We can only | |
5439 | * consider changing this number if no resync or reconstruction is | |
5440 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 5441 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
5442 | * of each device. If num_sectors is zero, we find the largest size |
5443 | * that fits. | |
5444 | ||
a35b0d69 N |
5445 | */ |
5446 | if (mddev->sync_thread) | |
5447 | return -EBUSY; | |
dba034ee N |
5448 | if (mddev->bitmap) |
5449 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
5450 | * grow, and re-add. | |
5451 | */ | |
5452 | return -EBUSY; | |
159ec1fc | 5453 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dd8ac336 | 5454 | sector_t avail = rdev->sectors; |
01ab5662 | 5455 | |
d71f9f88 AN |
5456 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
5457 | num_sectors = avail; | |
5458 | if (avail < num_sectors) | |
a35b0d69 N |
5459 | return -ENOSPC; |
5460 | } | |
d71f9f88 | 5461 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
5462 | if (!rv) |
5463 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
5464 | return rv; |
5465 | } | |
5466 | ||
da943b99 N |
5467 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
5468 | { | |
5469 | int rv; | |
5470 | /* change the number of raid disks */ | |
63c70c4f | 5471 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
5472 | return -EINVAL; |
5473 | if (raid_disks <= 0 || | |
233fca36 | 5474 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 5475 | return -EINVAL; |
63c70c4f | 5476 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 5477 | return -EBUSY; |
63c70c4f N |
5478 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
5479 | ||
5480 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
5481 | return rv; |
5482 | } | |
5483 | ||
5484 | ||
1da177e4 LT |
5485 | /* |
5486 | * update_array_info is used to change the configuration of an | |
5487 | * on-line array. | |
5488 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
5489 | * fields in the info are checked against the array. | |
5490 | * Any differences that cannot be handled will cause an error. | |
5491 | * Normally, only one change can be managed at a time. | |
5492 | */ | |
5493 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
5494 | { | |
5495 | int rv = 0; | |
5496 | int cnt = 0; | |
36fa3063 N |
5497 | int state = 0; |
5498 | ||
5499 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 5500 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5501 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
5502 | |
5503 | if (mddev->major_version != info->major_version || | |
5504 | mddev->minor_version != info->minor_version || | |
5505 | /* mddev->patch_version != info->patch_version || */ | |
5506 | mddev->ctime != info->ctime || | |
5507 | mddev->level != info->level || | |
5508 | /* mddev->layout != info->layout || */ | |
5509 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 5510 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
5511 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
5512 | ((state^info->state) & 0xfffffe00) | |
5513 | ) | |
1da177e4 LT |
5514 | return -EINVAL; |
5515 | /* Check there is only one change */ | |
58c0fed4 AN |
5516 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
5517 | cnt++; | |
5518 | if (mddev->raid_disks != info->raid_disks) | |
5519 | cnt++; | |
5520 | if (mddev->layout != info->layout) | |
5521 | cnt++; | |
5522 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
5523 | cnt++; | |
5524 | if (cnt == 0) | |
5525 | return 0; | |
5526 | if (cnt > 1) | |
5527 | return -EINVAL; | |
1da177e4 LT |
5528 | |
5529 | if (mddev->layout != info->layout) { | |
5530 | /* Change layout | |
5531 | * we don't need to do anything at the md level, the | |
5532 | * personality will take care of it all. | |
5533 | */ | |
50ac168a | 5534 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 5535 | return -EINVAL; |
597a711b N |
5536 | else { |
5537 | mddev->new_layout = info->layout; | |
50ac168a | 5538 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
5539 | if (rv) |
5540 | mddev->new_layout = mddev->layout; | |
5541 | return rv; | |
5542 | } | |
1da177e4 | 5543 | } |
58c0fed4 | 5544 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 5545 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 5546 | |
da943b99 N |
5547 | if (mddev->raid_disks != info->raid_disks) |
5548 | rv = update_raid_disks(mddev, info->raid_disks); | |
5549 | ||
36fa3063 N |
5550 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
5551 | if (mddev->pers->quiesce == NULL) | |
5552 | return -EINVAL; | |
5553 | if (mddev->recovery || mddev->sync_thread) | |
5554 | return -EBUSY; | |
5555 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
5556 | /* add the bitmap */ | |
5557 | if (mddev->bitmap) | |
5558 | return -EEXIST; | |
c3d9714e | 5559 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 5560 | return -EINVAL; |
c3d9714e N |
5561 | mddev->bitmap_info.offset = |
5562 | mddev->bitmap_info.default_offset; | |
36fa3063 N |
5563 | mddev->pers->quiesce(mddev, 1); |
5564 | rv = bitmap_create(mddev); | |
69e51b44 N |
5565 | if (!rv) |
5566 | rv = bitmap_load(mddev); | |
36fa3063 N |
5567 | if (rv) |
5568 | bitmap_destroy(mddev); | |
5569 | mddev->pers->quiesce(mddev, 0); | |
5570 | } else { | |
5571 | /* remove the bitmap */ | |
5572 | if (!mddev->bitmap) | |
5573 | return -ENOENT; | |
5574 | if (mddev->bitmap->file) | |
5575 | return -EINVAL; | |
5576 | mddev->pers->quiesce(mddev, 1); | |
5577 | bitmap_destroy(mddev); | |
5578 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 5579 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
5580 | } |
5581 | } | |
850b2b42 | 5582 | md_update_sb(mddev, 1); |
1da177e4 LT |
5583 | return rv; |
5584 | } | |
5585 | ||
5586 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
5587 | { | |
5588 | mdk_rdev_t *rdev; | |
5589 | ||
5590 | if (mddev->pers == NULL) | |
5591 | return -ENODEV; | |
5592 | ||
5593 | rdev = find_rdev(mddev, dev); | |
5594 | if (!rdev) | |
5595 | return -ENODEV; | |
5596 | ||
5597 | md_error(mddev, rdev); | |
5598 | return 0; | |
5599 | } | |
5600 | ||
2f9618ce AN |
5601 | /* |
5602 | * We have a problem here : there is no easy way to give a CHS | |
5603 | * virtual geometry. We currently pretend that we have a 2 heads | |
5604 | * 4 sectors (with a BIG number of cylinders...). This drives | |
5605 | * dosfs just mad... ;-) | |
5606 | */ | |
a885c8c4 CH |
5607 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
5608 | { | |
5609 | mddev_t *mddev = bdev->bd_disk->private_data; | |
5610 | ||
5611 | geo->heads = 2; | |
5612 | geo->sectors = 4; | |
49ce6cea | 5613 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
5614 | return 0; |
5615 | } | |
5616 | ||
a39907fa | 5617 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
5618 | unsigned int cmd, unsigned long arg) |
5619 | { | |
5620 | int err = 0; | |
5621 | void __user *argp = (void __user *)arg; | |
1da177e4 | 5622 | mddev_t *mddev = NULL; |
e2218350 | 5623 | int ro; |
1da177e4 LT |
5624 | |
5625 | if (!capable(CAP_SYS_ADMIN)) | |
5626 | return -EACCES; | |
5627 | ||
5628 | /* | |
5629 | * Commands dealing with the RAID driver but not any | |
5630 | * particular array: | |
5631 | */ | |
5632 | switch (cmd) | |
5633 | { | |
5634 | case RAID_VERSION: | |
5635 | err = get_version(argp); | |
5636 | goto done; | |
5637 | ||
5638 | case PRINT_RAID_DEBUG: | |
5639 | err = 0; | |
5640 | md_print_devices(); | |
5641 | goto done; | |
5642 | ||
5643 | #ifndef MODULE | |
5644 | case RAID_AUTORUN: | |
5645 | err = 0; | |
5646 | autostart_arrays(arg); | |
5647 | goto done; | |
5648 | #endif | |
5649 | default:; | |
5650 | } | |
5651 | ||
5652 | /* | |
5653 | * Commands creating/starting a new array: | |
5654 | */ | |
5655 | ||
a39907fa | 5656 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
5657 | |
5658 | if (!mddev) { | |
5659 | BUG(); | |
5660 | goto abort; | |
5661 | } | |
5662 | ||
1da177e4 LT |
5663 | err = mddev_lock(mddev); |
5664 | if (err) { | |
5665 | printk(KERN_INFO | |
5666 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
5667 | err, cmd); | |
5668 | goto abort; | |
5669 | } | |
5670 | ||
5671 | switch (cmd) | |
5672 | { | |
5673 | case SET_ARRAY_INFO: | |
5674 | { | |
5675 | mdu_array_info_t info; | |
5676 | if (!arg) | |
5677 | memset(&info, 0, sizeof(info)); | |
5678 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
5679 | err = -EFAULT; | |
5680 | goto abort_unlock; | |
5681 | } | |
5682 | if (mddev->pers) { | |
5683 | err = update_array_info(mddev, &info); | |
5684 | if (err) { | |
5685 | printk(KERN_WARNING "md: couldn't update" | |
5686 | " array info. %d\n", err); | |
5687 | goto abort_unlock; | |
5688 | } | |
5689 | goto done_unlock; | |
5690 | } | |
5691 | if (!list_empty(&mddev->disks)) { | |
5692 | printk(KERN_WARNING | |
5693 | "md: array %s already has disks!\n", | |
5694 | mdname(mddev)); | |
5695 | err = -EBUSY; | |
5696 | goto abort_unlock; | |
5697 | } | |
5698 | if (mddev->raid_disks) { | |
5699 | printk(KERN_WARNING | |
5700 | "md: array %s already initialised!\n", | |
5701 | mdname(mddev)); | |
5702 | err = -EBUSY; | |
5703 | goto abort_unlock; | |
5704 | } | |
5705 | err = set_array_info(mddev, &info); | |
5706 | if (err) { | |
5707 | printk(KERN_WARNING "md: couldn't set" | |
5708 | " array info. %d\n", err); | |
5709 | goto abort_unlock; | |
5710 | } | |
5711 | } | |
5712 | goto done_unlock; | |
5713 | ||
5714 | default:; | |
5715 | } | |
5716 | ||
5717 | /* | |
5718 | * Commands querying/configuring an existing array: | |
5719 | */ | |
32a7627c | 5720 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 5721 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
5722 | if ((!mddev->raid_disks && !mddev->external) |
5723 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
5724 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
5725 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
5726 | err = -ENODEV; |
5727 | goto abort_unlock; | |
5728 | } | |
5729 | ||
5730 | /* | |
5731 | * Commands even a read-only array can execute: | |
5732 | */ | |
5733 | switch (cmd) | |
5734 | { | |
5735 | case GET_ARRAY_INFO: | |
5736 | err = get_array_info(mddev, argp); | |
5737 | goto done_unlock; | |
5738 | ||
32a7627c | 5739 | case GET_BITMAP_FILE: |
87162a28 | 5740 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
5741 | goto done_unlock; |
5742 | ||
1da177e4 LT |
5743 | case GET_DISK_INFO: |
5744 | err = get_disk_info(mddev, argp); | |
5745 | goto done_unlock; | |
5746 | ||
5747 | case RESTART_ARRAY_RW: | |
5748 | err = restart_array(mddev); | |
5749 | goto done_unlock; | |
5750 | ||
5751 | case STOP_ARRAY: | |
d710e138 | 5752 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
5753 | goto done_unlock; |
5754 | ||
5755 | case STOP_ARRAY_RO: | |
a4bd82d0 | 5756 | err = md_set_readonly(mddev, 1); |
1da177e4 LT |
5757 | goto done_unlock; |
5758 | ||
e2218350 DW |
5759 | case BLKROSET: |
5760 | if (get_user(ro, (int __user *)(arg))) { | |
5761 | err = -EFAULT; | |
5762 | goto done_unlock; | |
5763 | } | |
5764 | err = -EINVAL; | |
5765 | ||
5766 | /* if the bdev is going readonly the value of mddev->ro | |
5767 | * does not matter, no writes are coming | |
5768 | */ | |
5769 | if (ro) | |
5770 | goto done_unlock; | |
5771 | ||
5772 | /* are we are already prepared for writes? */ | |
5773 | if (mddev->ro != 1) | |
5774 | goto done_unlock; | |
5775 | ||
5776 | /* transitioning to readauto need only happen for | |
5777 | * arrays that call md_write_start | |
5778 | */ | |
5779 | if (mddev->pers) { | |
5780 | err = restart_array(mddev); | |
5781 | if (err == 0) { | |
5782 | mddev->ro = 2; | |
5783 | set_disk_ro(mddev->gendisk, 0); | |
5784 | } | |
5785 | } | |
5786 | goto done_unlock; | |
1da177e4 LT |
5787 | } |
5788 | ||
5789 | /* | |
5790 | * The remaining ioctls are changing the state of the | |
f91de92e N |
5791 | * superblock, so we do not allow them on read-only arrays. |
5792 | * However non-MD ioctls (e.g. get-size) will still come through | |
5793 | * here and hit the 'default' below, so only disallow | |
5794 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 5795 | */ |
bb57fc64 | 5796 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
5797 | if (mddev->ro == 2) { |
5798 | mddev->ro = 0; | |
00bcb4ac | 5799 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 NB |
5800 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5801 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
5802 | } else { |
5803 | err = -EROFS; | |
5804 | goto abort_unlock; | |
5805 | } | |
1da177e4 LT |
5806 | } |
5807 | ||
5808 | switch (cmd) | |
5809 | { | |
5810 | case ADD_NEW_DISK: | |
5811 | { | |
5812 | mdu_disk_info_t info; | |
5813 | if (copy_from_user(&info, argp, sizeof(info))) | |
5814 | err = -EFAULT; | |
5815 | else | |
5816 | err = add_new_disk(mddev, &info); | |
5817 | goto done_unlock; | |
5818 | } | |
5819 | ||
5820 | case HOT_REMOVE_DISK: | |
5821 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
5822 | goto done_unlock; | |
5823 | ||
5824 | case HOT_ADD_DISK: | |
5825 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
5826 | goto done_unlock; | |
5827 | ||
5828 | case SET_DISK_FAULTY: | |
5829 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
5830 | goto done_unlock; | |
5831 | ||
5832 | case RUN_ARRAY: | |
d710e138 | 5833 | err = do_md_run(mddev); |
1da177e4 LT |
5834 | goto done_unlock; |
5835 | ||
32a7627c N |
5836 | case SET_BITMAP_FILE: |
5837 | err = set_bitmap_file(mddev, (int)arg); | |
5838 | goto done_unlock; | |
5839 | ||
1da177e4 | 5840 | default: |
1da177e4 LT |
5841 | err = -EINVAL; |
5842 | goto abort_unlock; | |
5843 | } | |
5844 | ||
5845 | done_unlock: | |
5846 | abort_unlock: | |
d3374825 N |
5847 | if (mddev->hold_active == UNTIL_IOCTL && |
5848 | err != -EINVAL) | |
5849 | mddev->hold_active = 0; | |
1da177e4 LT |
5850 | mddev_unlock(mddev); |
5851 | ||
5852 | return err; | |
5853 | done: | |
5854 | if (err) | |
5855 | MD_BUG(); | |
5856 | abort: | |
5857 | return err; | |
5858 | } | |
aa98aa31 AB |
5859 | #ifdef CONFIG_COMPAT |
5860 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
5861 | unsigned int cmd, unsigned long arg) | |
5862 | { | |
5863 | switch (cmd) { | |
5864 | case HOT_REMOVE_DISK: | |
5865 | case HOT_ADD_DISK: | |
5866 | case SET_DISK_FAULTY: | |
5867 | case SET_BITMAP_FILE: | |
5868 | /* These take in integer arg, do not convert */ | |
5869 | break; | |
5870 | default: | |
5871 | arg = (unsigned long)compat_ptr(arg); | |
5872 | break; | |
5873 | } | |
5874 | ||
5875 | return md_ioctl(bdev, mode, cmd, arg); | |
5876 | } | |
5877 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 5878 | |
a39907fa | 5879 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
5880 | { |
5881 | /* | |
5882 | * Succeed if we can lock the mddev, which confirms that | |
5883 | * it isn't being stopped right now. | |
5884 | */ | |
d3374825 | 5885 | mddev_t *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
5886 | int err; |
5887 | ||
d3374825 N |
5888 | if (mddev->gendisk != bdev->bd_disk) { |
5889 | /* we are racing with mddev_put which is discarding this | |
5890 | * bd_disk. | |
5891 | */ | |
5892 | mddev_put(mddev); | |
5893 | /* Wait until bdev->bd_disk is definitely gone */ | |
5894 | flush_scheduled_work(); | |
5895 | /* Then retry the open from the top */ | |
5896 | return -ERESTARTSYS; | |
5897 | } | |
5898 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
5899 | ||
c8c00a69 | 5900 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
5901 | goto out; |
5902 | ||
5903 | err = 0; | |
f2ea68cf | 5904 | atomic_inc(&mddev->openers); |
c8c00a69 | 5905 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 5906 | |
f3b99be1 | 5907 | check_disk_size_change(mddev->gendisk, bdev); |
1da177e4 LT |
5908 | out: |
5909 | return err; | |
5910 | } | |
5911 | ||
a39907fa | 5912 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 5913 | { |
a39907fa | 5914 | mddev_t *mddev = disk->private_data; |
1da177e4 | 5915 | |
52e5f9d1 | 5916 | BUG_ON(!mddev); |
f2ea68cf | 5917 | atomic_dec(&mddev->openers); |
1da177e4 LT |
5918 | mddev_put(mddev); |
5919 | ||
5920 | return 0; | |
5921 | } | |
83d5cde4 | 5922 | static const struct block_device_operations md_fops = |
1da177e4 LT |
5923 | { |
5924 | .owner = THIS_MODULE, | |
a39907fa AV |
5925 | .open = md_open, |
5926 | .release = md_release, | |
b492b852 | 5927 | .ioctl = md_ioctl, |
aa98aa31 AB |
5928 | #ifdef CONFIG_COMPAT |
5929 | .compat_ioctl = md_compat_ioctl, | |
5930 | #endif | |
a885c8c4 | 5931 | .getgeo = md_getgeo, |
1da177e4 LT |
5932 | }; |
5933 | ||
75c96f85 | 5934 | static int md_thread(void * arg) |
1da177e4 LT |
5935 | { |
5936 | mdk_thread_t *thread = arg; | |
5937 | ||
1da177e4 LT |
5938 | /* |
5939 | * md_thread is a 'system-thread', it's priority should be very | |
5940 | * high. We avoid resource deadlocks individually in each | |
5941 | * raid personality. (RAID5 does preallocation) We also use RR and | |
5942 | * the very same RT priority as kswapd, thus we will never get | |
5943 | * into a priority inversion deadlock. | |
5944 | * | |
5945 | * we definitely have to have equal or higher priority than | |
5946 | * bdflush, otherwise bdflush will deadlock if there are too | |
5947 | * many dirty RAID5 blocks. | |
5948 | */ | |
1da177e4 | 5949 | |
6985c43f | 5950 | allow_signal(SIGKILL); |
a6fb0934 | 5951 | while (!kthread_should_stop()) { |
1da177e4 | 5952 | |
93588e22 N |
5953 | /* We need to wait INTERRUPTIBLE so that |
5954 | * we don't add to the load-average. | |
5955 | * That means we need to be sure no signals are | |
5956 | * pending | |
5957 | */ | |
5958 | if (signal_pending(current)) | |
5959 | flush_signals(current); | |
5960 | ||
5961 | wait_event_interruptible_timeout | |
5962 | (thread->wqueue, | |
5963 | test_bit(THREAD_WAKEUP, &thread->flags) | |
5964 | || kthread_should_stop(), | |
5965 | thread->timeout); | |
1da177e4 LT |
5966 | |
5967 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
5968 | ||
787453c2 | 5969 | thread->run(thread->mddev); |
1da177e4 | 5970 | } |
a6fb0934 | 5971 | |
1da177e4 LT |
5972 | return 0; |
5973 | } | |
5974 | ||
5975 | void md_wakeup_thread(mdk_thread_t *thread) | |
5976 | { | |
5977 | if (thread) { | |
5978 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
5979 | set_bit(THREAD_WAKEUP, &thread->flags); | |
5980 | wake_up(&thread->wqueue); | |
5981 | } | |
5982 | } | |
5983 | ||
5984 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
5985 | const char *name) | |
5986 | { | |
5987 | mdk_thread_t *thread; | |
1da177e4 | 5988 | |
9ffae0cf | 5989 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
5990 | if (!thread) |
5991 | return NULL; | |
5992 | ||
1da177e4 LT |
5993 | init_waitqueue_head(&thread->wqueue); |
5994 | ||
1da177e4 LT |
5995 | thread->run = run; |
5996 | thread->mddev = mddev; | |
32a7627c | 5997 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
5998 | thread->tsk = kthread_run(md_thread, thread, |
5999 | "%s_%s", | |
6000 | mdname(thread->mddev), | |
6001 | name ?: mddev->pers->name); | |
a6fb0934 | 6002 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
6003 | kfree(thread); |
6004 | return NULL; | |
6005 | } | |
1da177e4 LT |
6006 | return thread; |
6007 | } | |
6008 | ||
1da177e4 LT |
6009 | void md_unregister_thread(mdk_thread_t *thread) |
6010 | { | |
e0cf8f04 N |
6011 | if (!thread) |
6012 | return; | |
ba25f9dc | 6013 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
6014 | |
6015 | kthread_stop(thread->tsk); | |
1da177e4 LT |
6016 | kfree(thread); |
6017 | } | |
6018 | ||
6019 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
6020 | { | |
6021 | if (!mddev) { | |
6022 | MD_BUG(); | |
6023 | return; | |
6024 | } | |
6025 | ||
b2d444d7 | 6026 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 6027 | return; |
6bfe0b49 DW |
6028 | |
6029 | if (mddev->external) | |
6030 | set_bit(Blocked, &rdev->flags); | |
32a7627c | 6031 | /* |
1da177e4 LT |
6032 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
6033 | mdname(mddev), | |
6034 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
6035 | __builtin_return_address(0),__builtin_return_address(1), | |
6036 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 6037 | */ |
d0a0a5ee AM |
6038 | if (!mddev->pers) |
6039 | return; | |
1da177e4 LT |
6040 | if (!mddev->pers->error_handler) |
6041 | return; | |
6042 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
6043 | if (mddev->degraded) |
6044 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 6045 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
6046 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6047 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6048 | md_wakeup_thread(mddev->thread); | |
768a418d N |
6049 | if (mddev->event_work.func) |
6050 | schedule_work(&mddev->event_work); | |
c331eb04 | 6051 | md_new_event_inintr(mddev); |
1da177e4 LT |
6052 | } |
6053 | ||
6054 | /* seq_file implementation /proc/mdstat */ | |
6055 | ||
6056 | static void status_unused(struct seq_file *seq) | |
6057 | { | |
6058 | int i = 0; | |
6059 | mdk_rdev_t *rdev; | |
1da177e4 LT |
6060 | |
6061 | seq_printf(seq, "unused devices: "); | |
6062 | ||
159ec1fc | 6063 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
6064 | char b[BDEVNAME_SIZE]; |
6065 | i++; | |
6066 | seq_printf(seq, "%s ", | |
6067 | bdevname(rdev->bdev,b)); | |
6068 | } | |
6069 | if (!i) | |
6070 | seq_printf(seq, "<none>"); | |
6071 | ||
6072 | seq_printf(seq, "\n"); | |
6073 | } | |
6074 | ||
6075 | ||
6076 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
6077 | { | |
dd71cf6b N |
6078 | sector_t max_sectors, resync, res; |
6079 | unsigned long dt, db; | |
6080 | sector_t rt; | |
4588b42e N |
6081 | int scale; |
6082 | unsigned int per_milli; | |
1da177e4 | 6083 | |
dd71cf6b | 6084 | resync = mddev->curr_resync - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6085 | |
6086 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
dd71cf6b | 6087 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 6088 | else |
dd71cf6b | 6089 | max_sectors = mddev->dev_sectors; |
1da177e4 LT |
6090 | |
6091 | /* | |
6092 | * Should not happen. | |
6093 | */ | |
dd71cf6b | 6094 | if (!max_sectors) { |
1da177e4 LT |
6095 | MD_BUG(); |
6096 | return; | |
6097 | } | |
4588b42e | 6098 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 6099 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
6100 | * u32, as those are the requirements for sector_div. |
6101 | * Thus 'scale' must be at least 10 | |
6102 | */ | |
6103 | scale = 10; | |
6104 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 6105 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
6106 | scale++; |
6107 | } | |
6108 | res = (resync>>scale)*1000; | |
dd71cf6b | 6109 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
6110 | |
6111 | per_milli = res; | |
1da177e4 | 6112 | { |
4588b42e | 6113 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
6114 | seq_printf(seq, "["); |
6115 | for (i = 0; i < x; i++) | |
6116 | seq_printf(seq, "="); | |
6117 | seq_printf(seq, ">"); | |
6118 | for (i = 0; i < y; i++) | |
6119 | seq_printf(seq, "."); | |
6120 | seq_printf(seq, "] "); | |
6121 | } | |
4588b42e | 6122 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
6123 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
6124 | "reshape" : | |
61df9d91 N |
6125 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
6126 | "check" : | |
6127 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
6128 | "resync" : "recovery"))), | |
6129 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
6130 | (unsigned long long) resync/2, |
6131 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
6132 | |
6133 | /* | |
1da177e4 LT |
6134 | * dt: time from mark until now |
6135 | * db: blocks written from mark until now | |
6136 | * rt: remaining time | |
dd71cf6b N |
6137 | * |
6138 | * rt is a sector_t, so could be 32bit or 64bit. | |
6139 | * So we divide before multiply in case it is 32bit and close | |
6140 | * to the limit. | |
6141 | * We scale the divisor (db) by 32 to avoid loosing precision | |
6142 | * near the end of resync when the number of remaining sectors | |
6143 | * is close to 'db'. | |
6144 | * We then divide rt by 32 after multiplying by db to compensate. | |
6145 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
6146 | */ |
6147 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
6148 | if (!dt) dt++; | |
ff4e8d9a N |
6149 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
6150 | - mddev->resync_mark_cnt; | |
1da177e4 | 6151 | |
dd71cf6b N |
6152 | rt = max_sectors - resync; /* number of remaining sectors */ |
6153 | sector_div(rt, db/32+1); | |
6154 | rt *= dt; | |
6155 | rt >>= 5; | |
6156 | ||
6157 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
6158 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 6159 | |
ff4e8d9a | 6160 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
6161 | } |
6162 | ||
6163 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
6164 | { | |
6165 | struct list_head *tmp; | |
6166 | loff_t l = *pos; | |
6167 | mddev_t *mddev; | |
6168 | ||
6169 | if (l >= 0x10000) | |
6170 | return NULL; | |
6171 | if (!l--) | |
6172 | /* header */ | |
6173 | return (void*)1; | |
6174 | ||
6175 | spin_lock(&all_mddevs_lock); | |
6176 | list_for_each(tmp,&all_mddevs) | |
6177 | if (!l--) { | |
6178 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
6179 | mddev_get(mddev); | |
6180 | spin_unlock(&all_mddevs_lock); | |
6181 | return mddev; | |
6182 | } | |
6183 | spin_unlock(&all_mddevs_lock); | |
6184 | if (!l--) | |
6185 | return (void*)2;/* tail */ | |
6186 | return NULL; | |
6187 | } | |
6188 | ||
6189 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
6190 | { | |
6191 | struct list_head *tmp; | |
6192 | mddev_t *next_mddev, *mddev = v; | |
6193 | ||
6194 | ++*pos; | |
6195 | if (v == (void*)2) | |
6196 | return NULL; | |
6197 | ||
6198 | spin_lock(&all_mddevs_lock); | |
6199 | if (v == (void*)1) | |
6200 | tmp = all_mddevs.next; | |
6201 | else | |
6202 | tmp = mddev->all_mddevs.next; | |
6203 | if (tmp != &all_mddevs) | |
6204 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
6205 | else { | |
6206 | next_mddev = (void*)2; | |
6207 | *pos = 0x10000; | |
6208 | } | |
6209 | spin_unlock(&all_mddevs_lock); | |
6210 | ||
6211 | if (v != (void*)1) | |
6212 | mddev_put(mddev); | |
6213 | return next_mddev; | |
6214 | ||
6215 | } | |
6216 | ||
6217 | static void md_seq_stop(struct seq_file *seq, void *v) | |
6218 | { | |
6219 | mddev_t *mddev = v; | |
6220 | ||
6221 | if (mddev && v != (void*)1 && v != (void*)2) | |
6222 | mddev_put(mddev); | |
6223 | } | |
6224 | ||
d7603b7e N |
6225 | struct mdstat_info { |
6226 | int event; | |
6227 | }; | |
6228 | ||
1da177e4 LT |
6229 | static int md_seq_show(struct seq_file *seq, void *v) |
6230 | { | |
6231 | mddev_t *mddev = v; | |
dd8ac336 | 6232 | sector_t sectors; |
1da177e4 | 6233 | mdk_rdev_t *rdev; |
d7603b7e | 6234 | struct mdstat_info *mi = seq->private; |
32a7627c | 6235 | struct bitmap *bitmap; |
1da177e4 LT |
6236 | |
6237 | if (v == (void*)1) { | |
2604b703 | 6238 | struct mdk_personality *pers; |
1da177e4 LT |
6239 | seq_printf(seq, "Personalities : "); |
6240 | spin_lock(&pers_lock); | |
2604b703 N |
6241 | list_for_each_entry(pers, &pers_list, list) |
6242 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
6243 | |
6244 | spin_unlock(&pers_lock); | |
6245 | seq_printf(seq, "\n"); | |
d7603b7e | 6246 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
6247 | return 0; |
6248 | } | |
6249 | if (v == (void*)2) { | |
6250 | status_unused(seq); | |
6251 | return 0; | |
6252 | } | |
6253 | ||
5dc5cf7d | 6254 | if (mddev_lock(mddev) < 0) |
1da177e4 | 6255 | return -EINTR; |
5dc5cf7d | 6256 | |
1da177e4 LT |
6257 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
6258 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
6259 | mddev->pers ? "" : "in"); | |
6260 | if (mddev->pers) { | |
f91de92e | 6261 | if (mddev->ro==1) |
1da177e4 | 6262 | seq_printf(seq, " (read-only)"); |
f91de92e | 6263 | if (mddev->ro==2) |
52720ae7 | 6264 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
6265 | seq_printf(seq, " %s", mddev->pers->name); |
6266 | } | |
6267 | ||
dd8ac336 | 6268 | sectors = 0; |
159ec1fc | 6269 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
6270 | char b[BDEVNAME_SIZE]; |
6271 | seq_printf(seq, " %s[%d]", | |
6272 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
6273 | if (test_bit(WriteMostly, &rdev->flags)) |
6274 | seq_printf(seq, "(W)"); | |
b2d444d7 | 6275 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6276 | seq_printf(seq, "(F)"); |
6277 | continue; | |
b325a32e N |
6278 | } else if (rdev->raid_disk < 0) |
6279 | seq_printf(seq, "(S)"); /* spare */ | |
dd8ac336 | 6280 | sectors += rdev->sectors; |
1da177e4 LT |
6281 | } |
6282 | ||
6283 | if (!list_empty(&mddev->disks)) { | |
6284 | if (mddev->pers) | |
6285 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
6286 | (unsigned long long) |
6287 | mddev->array_sectors / 2); | |
1da177e4 LT |
6288 | else |
6289 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 6290 | (unsigned long long)sectors / 2); |
1da177e4 | 6291 | } |
1cd6bf19 N |
6292 | if (mddev->persistent) { |
6293 | if (mddev->major_version != 0 || | |
6294 | mddev->minor_version != 90) { | |
6295 | seq_printf(seq," super %d.%d", | |
6296 | mddev->major_version, | |
6297 | mddev->minor_version); | |
6298 | } | |
e691063a N |
6299 | } else if (mddev->external) |
6300 | seq_printf(seq, " super external:%s", | |
6301 | mddev->metadata_type); | |
6302 | else | |
1cd6bf19 | 6303 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
6304 | |
6305 | if (mddev->pers) { | |
d710e138 | 6306 | mddev->pers->status(seq, mddev); |
1da177e4 | 6307 | seq_printf(seq, "\n "); |
8e1b39d6 N |
6308 | if (mddev->pers->sync_request) { |
6309 | if (mddev->curr_resync > 2) { | |
d710e138 | 6310 | status_resync(seq, mddev); |
8e1b39d6 N |
6311 | seq_printf(seq, "\n "); |
6312 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
6313 | seq_printf(seq, "\tresync=DELAYED\n "); | |
6314 | else if (mddev->recovery_cp < MaxSector) | |
6315 | seq_printf(seq, "\tresync=PENDING\n "); | |
6316 | } | |
32a7627c N |
6317 | } else |
6318 | seq_printf(seq, "\n "); | |
6319 | ||
6320 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
6321 | unsigned long chunk_kb; |
6322 | unsigned long flags; | |
32a7627c | 6323 | spin_lock_irqsave(&bitmap->lock, flags); |
42a04b50 | 6324 | chunk_kb = mddev->bitmap_info.chunksize >> 10; |
32a7627c N |
6325 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " |
6326 | "%lu%s chunk", | |
6327 | bitmap->pages - bitmap->missing_pages, | |
6328 | bitmap->pages, | |
6329 | (bitmap->pages - bitmap->missing_pages) | |
6330 | << (PAGE_SHIFT - 10), | |
42a04b50 | 6331 | chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize, |
32a7627c | 6332 | chunk_kb ? "KB" : "B"); |
78d742d8 N |
6333 | if (bitmap->file) { |
6334 | seq_printf(seq, ", file: "); | |
c32c2f63 | 6335 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 6336 | } |
78d742d8 | 6337 | |
32a7627c N |
6338 | seq_printf(seq, "\n"); |
6339 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
6340 | } |
6341 | ||
6342 | seq_printf(seq, "\n"); | |
6343 | } | |
6344 | mddev_unlock(mddev); | |
6345 | ||
6346 | return 0; | |
6347 | } | |
6348 | ||
110518bc | 6349 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
6350 | .start = md_seq_start, |
6351 | .next = md_seq_next, | |
6352 | .stop = md_seq_stop, | |
6353 | .show = md_seq_show, | |
6354 | }; | |
6355 | ||
6356 | static int md_seq_open(struct inode *inode, struct file *file) | |
6357 | { | |
6358 | int error; | |
d7603b7e N |
6359 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
6360 | if (mi == NULL) | |
6361 | return -ENOMEM; | |
1da177e4 LT |
6362 | |
6363 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
6364 | if (error) |
6365 | kfree(mi); | |
6366 | else { | |
6367 | struct seq_file *p = file->private_data; | |
6368 | p->private = mi; | |
6369 | mi->event = atomic_read(&md_event_count); | |
6370 | } | |
1da177e4 LT |
6371 | return error; |
6372 | } | |
6373 | ||
d7603b7e N |
6374 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
6375 | { | |
6376 | struct seq_file *m = filp->private_data; | |
6377 | struct mdstat_info *mi = m->private; | |
6378 | int mask; | |
6379 | ||
6380 | poll_wait(filp, &md_event_waiters, wait); | |
6381 | ||
6382 | /* always allow read */ | |
6383 | mask = POLLIN | POLLRDNORM; | |
6384 | ||
6385 | if (mi->event != atomic_read(&md_event_count)) | |
6386 | mask |= POLLERR | POLLPRI; | |
6387 | return mask; | |
6388 | } | |
6389 | ||
fa027c2a | 6390 | static const struct file_operations md_seq_fops = { |
e24650c2 | 6391 | .owner = THIS_MODULE, |
1da177e4 LT |
6392 | .open = md_seq_open, |
6393 | .read = seq_read, | |
6394 | .llseek = seq_lseek, | |
c3f94b40 | 6395 | .release = seq_release_private, |
d7603b7e | 6396 | .poll = mdstat_poll, |
1da177e4 LT |
6397 | }; |
6398 | ||
2604b703 | 6399 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 6400 | { |
1da177e4 | 6401 | spin_lock(&pers_lock); |
2604b703 N |
6402 | list_add_tail(&p->list, &pers_list); |
6403 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
6404 | spin_unlock(&pers_lock); |
6405 | return 0; | |
6406 | } | |
6407 | ||
2604b703 | 6408 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 6409 | { |
2604b703 | 6410 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 6411 | spin_lock(&pers_lock); |
2604b703 | 6412 | list_del_init(&p->list); |
1da177e4 LT |
6413 | spin_unlock(&pers_lock); |
6414 | return 0; | |
6415 | } | |
6416 | ||
eea1bf38 | 6417 | static int is_mddev_idle(mddev_t *mddev, int init) |
1da177e4 LT |
6418 | { |
6419 | mdk_rdev_t * rdev; | |
1da177e4 | 6420 | int idle; |
eea1bf38 | 6421 | int curr_events; |
1da177e4 LT |
6422 | |
6423 | idle = 1; | |
4b80991c N |
6424 | rcu_read_lock(); |
6425 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 6426 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
6427 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
6428 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
6429 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
6430 | /* sync IO will cause sync_io to increase before the disk_stats |
6431 | * as sync_io is counted when a request starts, and | |
6432 | * disk_stats is counted when it completes. | |
6433 | * So resync activity will cause curr_events to be smaller than | |
6434 | * when there was no such activity. | |
6435 | * non-sync IO will cause disk_stat to increase without | |
6436 | * increasing sync_io so curr_events will (eventually) | |
6437 | * be larger than it was before. Once it becomes | |
6438 | * substantially larger, the test below will cause | |
6439 | * the array to appear non-idle, and resync will slow | |
6440 | * down. | |
6441 | * If there is a lot of outstanding resync activity when | |
6442 | * we set last_event to curr_events, then all that activity | |
6443 | * completing might cause the array to appear non-idle | |
6444 | * and resync will be slowed down even though there might | |
6445 | * not have been non-resync activity. This will only | |
6446 | * happen once though. 'last_events' will soon reflect | |
6447 | * the state where there is little or no outstanding | |
6448 | * resync requests, and further resync activity will | |
6449 | * always make curr_events less than last_events. | |
c0e48521 | 6450 | * |
1da177e4 | 6451 | */ |
eea1bf38 | 6452 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
6453 | rdev->last_events = curr_events; |
6454 | idle = 0; | |
6455 | } | |
6456 | } | |
4b80991c | 6457 | rcu_read_unlock(); |
1da177e4 LT |
6458 | return idle; |
6459 | } | |
6460 | ||
6461 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
6462 | { | |
6463 | /* another "blocks" (512byte) blocks have been synced */ | |
6464 | atomic_sub(blocks, &mddev->recovery_active); | |
6465 | wake_up(&mddev->recovery_wait); | |
6466 | if (!ok) { | |
dfc70645 | 6467 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6468 | md_wakeup_thread(mddev->thread); |
6469 | // stop recovery, signal do_sync .... | |
6470 | } | |
6471 | } | |
6472 | ||
6473 | ||
06d91a5f N |
6474 | /* md_write_start(mddev, bi) |
6475 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
6476 | * in superblock) before writing, schedule a superblock update |
6477 | * and wait for it to complete. | |
06d91a5f | 6478 | */ |
3d310eb7 | 6479 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 6480 | { |
0fd62b86 | 6481 | int did_change = 0; |
06d91a5f | 6482 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 6483 | return; |
06d91a5f | 6484 | |
f91de92e N |
6485 | BUG_ON(mddev->ro == 1); |
6486 | if (mddev->ro == 2) { | |
6487 | /* need to switch to read/write */ | |
6488 | mddev->ro = 0; | |
6489 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6490 | md_wakeup_thread(mddev->thread); | |
25156198 | 6491 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 6492 | did_change = 1; |
f91de92e | 6493 | } |
06d91a5f | 6494 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
6495 | if (mddev->safemode == 1) |
6496 | mddev->safemode = 0; | |
06d91a5f | 6497 | if (mddev->in_sync) { |
a9701a30 | 6498 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
6499 | if (mddev->in_sync) { |
6500 | mddev->in_sync = 0; | |
850b2b42 | 6501 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 6502 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 6503 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 6504 | did_change = 1; |
3d310eb7 | 6505 | } |
a9701a30 | 6506 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 6507 | } |
0fd62b86 | 6508 | if (did_change) |
00bcb4ac | 6509 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 6510 | wait_event(mddev->sb_wait, |
09a44cc1 | 6511 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 LT |
6512 | } |
6513 | ||
6514 | void md_write_end(mddev_t *mddev) | |
6515 | { | |
6516 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
6517 | if (mddev->safemode == 2) | |
6518 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 6519 | else if (mddev->safemode_delay) |
1da177e4 LT |
6520 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
6521 | } | |
6522 | } | |
6523 | ||
2a2275d6 N |
6524 | /* md_allow_write(mddev) |
6525 | * Calling this ensures that the array is marked 'active' so that writes | |
6526 | * may proceed without blocking. It is important to call this before | |
6527 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
6528 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
6529 | * |
6530 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
6531 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 6532 | */ |
b5470dc5 | 6533 | int md_allow_write(mddev_t *mddev) |
2a2275d6 N |
6534 | { |
6535 | if (!mddev->pers) | |
b5470dc5 | 6536 | return 0; |
2a2275d6 | 6537 | if (mddev->ro) |
b5470dc5 | 6538 | return 0; |
1a0fd497 | 6539 | if (!mddev->pers->sync_request) |
b5470dc5 | 6540 | return 0; |
2a2275d6 N |
6541 | |
6542 | spin_lock_irq(&mddev->write_lock); | |
6543 | if (mddev->in_sync) { | |
6544 | mddev->in_sync = 0; | |
6545 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 6546 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
6547 | if (mddev->safemode_delay && |
6548 | mddev->safemode == 0) | |
6549 | mddev->safemode = 1; | |
6550 | spin_unlock_irq(&mddev->write_lock); | |
6551 | md_update_sb(mddev, 0); | |
00bcb4ac | 6552 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 N |
6553 | } else |
6554 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 | 6555 | |
070dc6dd | 6556 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
6557 | return -EAGAIN; |
6558 | else | |
6559 | return 0; | |
2a2275d6 N |
6560 | } |
6561 | EXPORT_SYMBOL_GPL(md_allow_write); | |
6562 | ||
b63d7c2e | 6563 | void md_unplug(mddev_t *mddev) |
252ac522 N |
6564 | { |
6565 | if (mddev->queue) | |
6566 | blk_unplug(mddev->queue); | |
6567 | if (mddev->plug) | |
6568 | mddev->plug->unplug_fn(mddev->plug); | |
6569 | } | |
6570 | ||
1da177e4 LT |
6571 | #define SYNC_MARKS 10 |
6572 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 6573 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
6574 | { |
6575 | mddev_t *mddev2; | |
6576 | unsigned int currspeed = 0, | |
6577 | window; | |
57afd89f | 6578 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
6579 | unsigned long mark[SYNC_MARKS]; |
6580 | sector_t mark_cnt[SYNC_MARKS]; | |
6581 | int last_mark,m; | |
6582 | struct list_head *tmp; | |
6583 | sector_t last_check; | |
57afd89f | 6584 | int skipped = 0; |
5fd6c1dc | 6585 | mdk_rdev_t *rdev; |
61df9d91 | 6586 | char *desc; |
1da177e4 LT |
6587 | |
6588 | /* just incase thread restarts... */ | |
6589 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
6590 | return; | |
5fd6c1dc N |
6591 | if (mddev->ro) /* never try to sync a read-only array */ |
6592 | return; | |
1da177e4 | 6593 | |
61df9d91 N |
6594 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
6595 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
6596 | desc = "data-check"; | |
6597 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6598 | desc = "requested-resync"; | |
6599 | else | |
6600 | desc = "resync"; | |
6601 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
6602 | desc = "reshape"; | |
6603 | else | |
6604 | desc = "recovery"; | |
6605 | ||
1da177e4 LT |
6606 | /* we overload curr_resync somewhat here. |
6607 | * 0 == not engaged in resync at all | |
6608 | * 2 == checking that there is no conflict with another sync | |
6609 | * 1 == like 2, but have yielded to allow conflicting resync to | |
6610 | * commense | |
6611 | * other == active in resync - this many blocks | |
6612 | * | |
6613 | * Before starting a resync we must have set curr_resync to | |
6614 | * 2, and then checked that every "conflicting" array has curr_resync | |
6615 | * less than ours. When we find one that is the same or higher | |
6616 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
6617 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
6618 | * This will mean we have to start checking from the beginning again. | |
6619 | * | |
6620 | */ | |
6621 | ||
6622 | do { | |
6623 | mddev->curr_resync = 2; | |
6624 | ||
6625 | try_again: | |
404e4b43 | 6626 | if (kthread_should_stop()) |
6985c43f | 6627 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
404e4b43 N |
6628 | |
6629 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
1da177e4 | 6630 | goto skip; |
29ac4aa3 | 6631 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
6632 | if (mddev2 == mddev) |
6633 | continue; | |
90b08710 BS |
6634 | if (!mddev->parallel_resync |
6635 | && mddev2->curr_resync | |
6636 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
6637 | DEFINE_WAIT(wq); |
6638 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
6639 | /* arbitrarily yield */ | |
6640 | mddev->curr_resync = 1; | |
6641 | wake_up(&resync_wait); | |
6642 | } | |
6643 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
6644 | /* no need to wait here, we can wait the next | |
6645 | * time 'round when curr_resync == 2 | |
6646 | */ | |
6647 | continue; | |
9744197c N |
6648 | /* We need to wait 'interruptible' so as not to |
6649 | * contribute to the load average, and not to | |
6650 | * be caught by 'softlockup' | |
6651 | */ | |
6652 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 6653 | if (!kthread_should_stop() && |
8712e553 | 6654 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
6655 | printk(KERN_INFO "md: delaying %s of %s" |
6656 | " until %s has finished (they" | |
1da177e4 | 6657 | " share one or more physical units)\n", |
61df9d91 | 6658 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 6659 | mddev_put(mddev2); |
9744197c N |
6660 | if (signal_pending(current)) |
6661 | flush_signals(current); | |
1da177e4 LT |
6662 | schedule(); |
6663 | finish_wait(&resync_wait, &wq); | |
6664 | goto try_again; | |
6665 | } | |
6666 | finish_wait(&resync_wait, &wq); | |
6667 | } | |
6668 | } | |
6669 | } while (mddev->curr_resync < 2); | |
6670 | ||
5fd6c1dc | 6671 | j = 0; |
9d88883e | 6672 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 6673 | /* resync follows the size requested by the personality, |
57afd89f | 6674 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
6675 | */ |
6676 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 6677 | mddev->resync_mismatches = 0; |
5fd6c1dc | 6678 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
6679 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
6680 | j = mddev->resync_min; | |
6681 | else if (!mddev->bitmap) | |
5fd6c1dc | 6682 | j = mddev->recovery_cp; |
5e96ee65 | 6683 | |
ccfcc3c1 | 6684 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
58c0fed4 | 6685 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6686 | else { |
1da177e4 | 6687 | /* recovery follows the physical size of devices */ |
58c0fed4 | 6688 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6689 | j = MaxSector; |
4e59ca7d DW |
6690 | rcu_read_lock(); |
6691 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc N |
6692 | if (rdev->raid_disk >= 0 && |
6693 | !test_bit(Faulty, &rdev->flags) && | |
6694 | !test_bit(In_sync, &rdev->flags) && | |
6695 | rdev->recovery_offset < j) | |
6696 | j = rdev->recovery_offset; | |
4e59ca7d | 6697 | rcu_read_unlock(); |
5fd6c1dc | 6698 | } |
1da177e4 | 6699 | |
61df9d91 N |
6700 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
6701 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
6702 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 6703 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
6704 | "(but not more than %d KB/sec) for %s.\n", |
6705 | speed_max(mddev), desc); | |
1da177e4 | 6706 | |
eea1bf38 | 6707 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 6708 | |
57afd89f | 6709 | io_sectors = 0; |
1da177e4 LT |
6710 | for (m = 0; m < SYNC_MARKS; m++) { |
6711 | mark[m] = jiffies; | |
57afd89f | 6712 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
6713 | } |
6714 | last_mark = 0; | |
6715 | mddev->resync_mark = mark[last_mark]; | |
6716 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
6717 | ||
6718 | /* | |
6719 | * Tune reconstruction: | |
6720 | */ | |
6721 | window = 32*(PAGE_SIZE/512); | |
6722 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
6723 | window/2,(unsigned long long) max_sectors/2); | |
6724 | ||
6725 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
6726 | last_check = 0; |
6727 | ||
6728 | if (j>2) { | |
6729 | printk(KERN_INFO | |
61df9d91 N |
6730 | "md: resuming %s of %s from checkpoint.\n", |
6731 | desc, mdname(mddev)); | |
1da177e4 LT |
6732 | mddev->curr_resync = j; |
6733 | } | |
efa59339 | 6734 | mddev->curr_resync_completed = mddev->curr_resync; |
1da177e4 LT |
6735 | |
6736 | while (j < max_sectors) { | |
57afd89f | 6737 | sector_t sectors; |
1da177e4 | 6738 | |
57afd89f | 6739 | skipped = 0; |
97e4f42d | 6740 | |
7a91ee1f N |
6741 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
6742 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
6743 | (mddev->curr_resync - mddev->curr_resync_completed) | |
6744 | > (max_sectors >> 4)) || | |
6745 | (j - mddev->curr_resync_completed)*2 | |
6746 | >= mddev->resync_max - mddev->curr_resync_completed | |
6747 | )) { | |
97e4f42d | 6748 | /* time to update curr_resync_completed */ |
252ac522 | 6749 | md_unplug(mddev); |
97e4f42d N |
6750 | wait_event(mddev->recovery_wait, |
6751 | atomic_read(&mddev->recovery_active) == 0); | |
6752 | mddev->curr_resync_completed = | |
6753 | mddev->curr_resync; | |
070dc6dd | 6754 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 6755 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 6756 | } |
acb180b0 | 6757 | |
e62e58a5 N |
6758 | while (j >= mddev->resync_max && !kthread_should_stop()) { |
6759 | /* As this condition is controlled by user-space, | |
6760 | * we can block indefinitely, so use '_interruptible' | |
6761 | * to avoid triggering warnings. | |
6762 | */ | |
6763 | flush_signals(current); /* just in case */ | |
6764 | wait_event_interruptible(mddev->recovery_wait, | |
6765 | mddev->resync_max > j | |
6766 | || kthread_should_stop()); | |
6767 | } | |
acb180b0 N |
6768 | |
6769 | if (kthread_should_stop()) | |
6770 | goto interrupted; | |
6771 | ||
57afd89f | 6772 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 6773 | currspeed < speed_min(mddev)); |
57afd89f | 6774 | if (sectors == 0) { |
dfc70645 | 6775 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6776 | goto out; |
6777 | } | |
57afd89f N |
6778 | |
6779 | if (!skipped) { /* actual IO requested */ | |
6780 | io_sectors += sectors; | |
6781 | atomic_add(sectors, &mddev->recovery_active); | |
6782 | } | |
6783 | ||
1da177e4 LT |
6784 | j += sectors; |
6785 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 6786 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
6787 | if (last_check == 0) |
6788 | /* this is the earliers that rebuilt will be | |
6789 | * visible in /proc/mdstat | |
6790 | */ | |
6791 | md_new_event(mddev); | |
57afd89f N |
6792 | |
6793 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
6794 | continue; |
6795 | ||
57afd89f | 6796 | last_check = io_sectors; |
1da177e4 | 6797 | |
dfc70645 | 6798 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 LT |
6799 | break; |
6800 | ||
6801 | repeat: | |
6802 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
6803 | /* step marks */ | |
6804 | int next = (last_mark+1) % SYNC_MARKS; | |
6805 | ||
6806 | mddev->resync_mark = mark[next]; | |
6807 | mddev->resync_mark_cnt = mark_cnt[next]; | |
6808 | mark[next] = jiffies; | |
57afd89f | 6809 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6810 | last_mark = next; |
6811 | } | |
6812 | ||
6813 | ||
c6207277 N |
6814 | if (kthread_should_stop()) |
6815 | goto interrupted; | |
6816 | ||
1da177e4 LT |
6817 | |
6818 | /* | |
6819 | * this loop exits only if either when we are slower than | |
6820 | * the 'hard' speed limit, or the system was IO-idle for | |
6821 | * a jiffy. | |
6822 | * the system might be non-idle CPU-wise, but we only care | |
6823 | * about not overloading the IO subsystem. (things like an | |
6824 | * e2fsck being done on the RAID array should execute fast) | |
6825 | */ | |
252ac522 | 6826 | md_unplug(mddev); |
1da177e4 LT |
6827 | cond_resched(); |
6828 | ||
57afd89f N |
6829 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
6830 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 6831 | |
88202a0c N |
6832 | if (currspeed > speed_min(mddev)) { |
6833 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 6834 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 6835 | msleep(500); |
1da177e4 LT |
6836 | goto repeat; |
6837 | } | |
6838 | } | |
6839 | } | |
61df9d91 | 6840 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
6841 | /* |
6842 | * this also signals 'finished resyncing' to md_stop | |
6843 | */ | |
6844 | out: | |
252ac522 | 6845 | md_unplug(mddev); |
1da177e4 LT |
6846 | |
6847 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
6848 | ||
6849 | /* tell personality that we are finished */ | |
57afd89f | 6850 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 6851 | |
dfc70645 | 6852 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
6853 | mddev->curr_resync > 2) { |
6854 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
6855 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
6856 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
6857 | printk(KERN_INFO | |
61df9d91 N |
6858 | "md: checkpointing %s of %s.\n", |
6859 | desc, mdname(mddev)); | |
5fd6c1dc N |
6860 | mddev->recovery_cp = mddev->curr_resync; |
6861 | } | |
6862 | } else | |
6863 | mddev->recovery_cp = MaxSector; | |
6864 | } else { | |
6865 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6866 | mddev->curr_resync = MaxSector; | |
4e59ca7d DW |
6867 | rcu_read_lock(); |
6868 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc | 6869 | if (rdev->raid_disk >= 0 && |
70fffd0b | 6870 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
6871 | !test_bit(Faulty, &rdev->flags) && |
6872 | !test_bit(In_sync, &rdev->flags) && | |
6873 | rdev->recovery_offset < mddev->curr_resync) | |
6874 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 6875 | rcu_read_unlock(); |
5fd6c1dc | 6876 | } |
1da177e4 | 6877 | } |
17571284 | 6878 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6879 | |
1da177e4 | 6880 | skip: |
c07b70ad N |
6881 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
6882 | /* We completed so min/max setting can be forgotten if used. */ | |
6883 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6884 | mddev->resync_min = 0; | |
6885 | mddev->resync_max = MaxSector; | |
6886 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6887 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 | 6888 | mddev->curr_resync = 0; |
efa59339 N |
6889 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
6890 | mddev->curr_resync_completed = 0; | |
c6207277 | 6891 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
1da177e4 LT |
6892 | wake_up(&resync_wait); |
6893 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
6894 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
6895 | return; |
6896 | ||
6897 | interrupted: | |
6898 | /* | |
6899 | * got a signal, exit. | |
6900 | */ | |
6901 | printk(KERN_INFO | |
6902 | "md: md_do_sync() got signal ... exiting\n"); | |
6903 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6904 | goto out; | |
6905 | ||
1da177e4 | 6906 | } |
29269553 | 6907 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
6908 | |
6909 | ||
b4c4c7b8 N |
6910 | static int remove_and_add_spares(mddev_t *mddev) |
6911 | { | |
6912 | mdk_rdev_t *rdev; | |
b4c4c7b8 N |
6913 | int spares = 0; |
6914 | ||
97e4f42d N |
6915 | mddev->curr_resync_completed = 0; |
6916 | ||
159ec1fc | 6917 | list_for_each_entry(rdev, &mddev->disks, same_set) |
b4c4c7b8 | 6918 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 6919 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
6920 | (test_bit(Faulty, &rdev->flags) || |
6921 | ! test_bit(In_sync, &rdev->flags)) && | |
6922 | atomic_read(&rdev->nr_pending)==0) { | |
6923 | if (mddev->pers->hot_remove_disk( | |
6924 | mddev, rdev->raid_disk)==0) { | |
6925 | char nm[20]; | |
6926 | sprintf(nm,"rd%d", rdev->raid_disk); | |
6927 | sysfs_remove_link(&mddev->kobj, nm); | |
6928 | rdev->raid_disk = -1; | |
6929 | } | |
6930 | } | |
6931 | ||
4044ba58 | 6932 | if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) { |
159ec1fc | 6933 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dfc70645 | 6934 | if (rdev->raid_disk >= 0 && |
e5427135 DW |
6935 | !test_bit(In_sync, &rdev->flags) && |
6936 | !test_bit(Blocked, &rdev->flags)) | |
dfc70645 | 6937 | spares++; |
b4c4c7b8 N |
6938 | if (rdev->raid_disk < 0 |
6939 | && !test_bit(Faulty, &rdev->flags)) { | |
6940 | rdev->recovery_offset = 0; | |
199050ea NB |
6941 | if (mddev->pers-> |
6942 | hot_add_disk(mddev, rdev) == 0) { | |
b4c4c7b8 N |
6943 | char nm[20]; |
6944 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
6945 | if (sysfs_create_link(&mddev->kobj, |
6946 | &rdev->kobj, nm)) | |
00bcb4ac | 6947 | /* failure here is OK */; |
b4c4c7b8 N |
6948 | spares++; |
6949 | md_new_event(mddev); | |
93be75ff | 6950 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
b4c4c7b8 N |
6951 | } else |
6952 | break; | |
6953 | } | |
dfc70645 | 6954 | } |
b4c4c7b8 N |
6955 | } |
6956 | return spares; | |
6957 | } | |
1da177e4 LT |
6958 | /* |
6959 | * This routine is regularly called by all per-raid-array threads to | |
6960 | * deal with generic issues like resync and super-block update. | |
6961 | * Raid personalities that don't have a thread (linear/raid0) do not | |
6962 | * need this as they never do any recovery or update the superblock. | |
6963 | * | |
6964 | * It does not do any resync itself, but rather "forks" off other threads | |
6965 | * to do that as needed. | |
6966 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
6967 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 6968 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
6969 | * and wakeups up this thread which will reap the thread and finish up. |
6970 | * This thread also removes any faulty devices (with nr_pending == 0). | |
6971 | * | |
6972 | * The overall approach is: | |
6973 | * 1/ if the superblock needs updating, update it. | |
6974 | * 2/ If a recovery thread is running, don't do anything else. | |
6975 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
6976 | * 4/ If there are any faulty devices, remove them. | |
6977 | * 5/ If array is degraded, try to add spares devices | |
6978 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
6979 | */ | |
6980 | void md_check_recovery(mddev_t *mddev) | |
6981 | { | |
6982 | mdk_rdev_t *rdev; | |
1da177e4 LT |
6983 | |
6984 | ||
5f40402d | 6985 | if (mddev->bitmap) |
aa5cbd10 | 6986 | bitmap_daemon_work(mddev); |
1da177e4 LT |
6987 | |
6988 | if (mddev->ro) | |
6989 | return; | |
fca4d848 N |
6990 | |
6991 | if (signal_pending(current)) { | |
31a59e34 | 6992 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
6993 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
6994 | mdname(mddev)); | |
6995 | mddev->safemode = 2; | |
6996 | } | |
6997 | flush_signals(current); | |
6998 | } | |
6999 | ||
c89a8eee N |
7000 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
7001 | return; | |
1da177e4 | 7002 | if ( ! ( |
126925c0 | 7003 | (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 7004 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 7005 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 7006 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
7007 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
7008 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
7009 | )) |
7010 | return; | |
fca4d848 | 7011 | |
df5b89b3 | 7012 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 7013 | int spares = 0; |
fca4d848 | 7014 | |
c89a8eee N |
7015 | if (mddev->ro) { |
7016 | /* Only thing we do on a ro array is remove | |
7017 | * failed devices. | |
7018 | */ | |
7019 | remove_and_add_spares(mddev); | |
7020 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7021 | goto unlock; | |
7022 | } | |
7023 | ||
31a59e34 | 7024 | if (!mddev->external) { |
0fd62b86 | 7025 | int did_change = 0; |
31a59e34 N |
7026 | spin_lock_irq(&mddev->write_lock); |
7027 | if (mddev->safemode && | |
7028 | !atomic_read(&mddev->writes_pending) && | |
7029 | !mddev->in_sync && | |
7030 | mddev->recovery_cp == MaxSector) { | |
7031 | mddev->in_sync = 1; | |
0fd62b86 | 7032 | did_change = 1; |
070dc6dd | 7033 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
7034 | } |
7035 | if (mddev->safemode == 1) | |
7036 | mddev->safemode = 0; | |
7037 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 7038 | if (did_change) |
00bcb4ac | 7039 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 7040 | } |
fca4d848 | 7041 | |
850b2b42 N |
7042 | if (mddev->flags) |
7043 | md_update_sb(mddev, 0); | |
06d91a5f | 7044 | |
1da177e4 LT |
7045 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
7046 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
7047 | /* resync/recovery still happening */ | |
7048 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7049 | goto unlock; | |
7050 | } | |
7051 | if (mddev->sync_thread) { | |
7052 | /* resync has finished, collect result */ | |
7053 | md_unregister_thread(mddev->sync_thread); | |
7054 | mddev->sync_thread = NULL; | |
56ac36d7 DW |
7055 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
7056 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
1da177e4 LT |
7057 | /* success...*/ |
7058 | /* activate any spares */ | |
a99ac971 NB |
7059 | if (mddev->pers->spare_active(mddev)) |
7060 | sysfs_notify(&mddev->kobj, NULL, | |
7061 | "degraded"); | |
1da177e4 | 7062 | } |
cea9c228 N |
7063 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7064 | mddev->pers->finish_reshape) | |
7065 | mddev->pers->finish_reshape(mddev); | |
850b2b42 | 7066 | md_update_sb(mddev, 1); |
41158c7e N |
7067 | |
7068 | /* if array is no-longer degraded, then any saved_raid_disk | |
7069 | * information must be scrapped | |
7070 | */ | |
7071 | if (!mddev->degraded) | |
159ec1fc | 7072 | list_for_each_entry(rdev, &mddev->disks, same_set) |
41158c7e N |
7073 | rdev->saved_raid_disk = -1; |
7074 | ||
1da177e4 LT |
7075 | mddev->recovery = 0; |
7076 | /* flag recovery needed just to double check */ | |
7077 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
00bcb4ac | 7078 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
d7603b7e | 7079 | md_new_event(mddev); |
1da177e4 LT |
7080 | goto unlock; |
7081 | } | |
72a23c21 NB |
7082 | /* Set RUNNING before clearing NEEDED to avoid |
7083 | * any transients in the value of "sync_action". | |
7084 | */ | |
7085 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7086 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
7087 | /* Clear some bits that don't mean anything, but |
7088 | * might be left set | |
7089 | */ | |
24dd469d N |
7090 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7091 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 7092 | |
5fd6c1dc N |
7093 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
7094 | goto unlock; | |
1da177e4 LT |
7095 | /* no recovery is running. |
7096 | * remove any failed drives, then | |
7097 | * add spares if possible. | |
7098 | * Spare are also removed and re-added, to allow | |
7099 | * the personality to fail the re-add. | |
7100 | */ | |
1da177e4 | 7101 | |
b4c4c7b8 | 7102 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
7103 | if (mddev->pers->check_reshape == NULL || |
7104 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 N |
7105 | /* Cannot proceed */ |
7106 | goto unlock; | |
7107 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 7108 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 7109 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
7110 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7111 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 7112 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 7113 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7114 | } else if (mddev->recovery_cp < MaxSector) { |
7115 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 7116 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7117 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
7118 | /* nothing to be done ... */ | |
1da177e4 | 7119 | goto unlock; |
24dd469d | 7120 | |
1da177e4 | 7121 | if (mddev->pers->sync_request) { |
a654b9d8 N |
7122 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
7123 | /* We are adding a device or devices to an array | |
7124 | * which has the bitmap stored on all devices. | |
7125 | * So make sure all bitmap pages get written | |
7126 | */ | |
7127 | bitmap_write_all(mddev->bitmap); | |
7128 | } | |
1da177e4 LT |
7129 | mddev->sync_thread = md_register_thread(md_do_sync, |
7130 | mddev, | |
0da3c619 | 7131 | "resync"); |
1da177e4 LT |
7132 | if (!mddev->sync_thread) { |
7133 | printk(KERN_ERR "%s: could not start resync" | |
7134 | " thread...\n", | |
7135 | mdname(mddev)); | |
7136 | /* leave the spares where they are, it shouldn't hurt */ | |
7137 | mddev->recovery = 0; | |
d7603b7e | 7138 | } else |
1da177e4 | 7139 | md_wakeup_thread(mddev->sync_thread); |
00bcb4ac | 7140 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
d7603b7e | 7141 | md_new_event(mddev); |
1da177e4 LT |
7142 | } |
7143 | unlock: | |
72a23c21 NB |
7144 | if (!mddev->sync_thread) { |
7145 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7146 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
7147 | &mddev->recovery)) | |
0c3573f1 | 7148 | if (mddev->sysfs_action) |
00bcb4ac | 7149 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 7150 | } |
1da177e4 LT |
7151 | mddev_unlock(mddev); |
7152 | } | |
7153 | } | |
7154 | ||
6bfe0b49 DW |
7155 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
7156 | { | |
00bcb4ac | 7157 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 DW |
7158 | wait_event_timeout(rdev->blocked_wait, |
7159 | !test_bit(Blocked, &rdev->flags), | |
7160 | msecs_to_jiffies(5000)); | |
7161 | rdev_dec_pending(rdev, mddev); | |
7162 | } | |
7163 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
7164 | ||
75c96f85 AB |
7165 | static int md_notify_reboot(struct notifier_block *this, |
7166 | unsigned long code, void *x) | |
1da177e4 LT |
7167 | { |
7168 | struct list_head *tmp; | |
7169 | mddev_t *mddev; | |
7170 | ||
7171 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
7172 | ||
7173 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
7174 | ||
29ac4aa3 | 7175 | for_each_mddev(mddev, tmp) |
c71d4887 | 7176 | if (mddev_trylock(mddev)) { |
2b25000b N |
7177 | /* Force a switch to readonly even array |
7178 | * appears to still be in use. Hence | |
7179 | * the '100'. | |
7180 | */ | |
a4bd82d0 | 7181 | md_set_readonly(mddev, 100); |
c71d4887 NB |
7182 | mddev_unlock(mddev); |
7183 | } | |
1da177e4 LT |
7184 | /* |
7185 | * certain more exotic SCSI devices are known to be | |
7186 | * volatile wrt too early system reboots. While the | |
7187 | * right place to handle this issue is the given | |
7188 | * driver, we do want to have a safe RAID driver ... | |
7189 | */ | |
7190 | mdelay(1000*1); | |
7191 | } | |
7192 | return NOTIFY_DONE; | |
7193 | } | |
7194 | ||
75c96f85 | 7195 | static struct notifier_block md_notifier = { |
1da177e4 LT |
7196 | .notifier_call = md_notify_reboot, |
7197 | .next = NULL, | |
7198 | .priority = INT_MAX, /* before any real devices */ | |
7199 | }; | |
7200 | ||
7201 | static void md_geninit(void) | |
7202 | { | |
1da177e4 LT |
7203 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
7204 | ||
c7705f34 | 7205 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
7206 | } |
7207 | ||
75c96f85 | 7208 | static int __init md_init(void) |
1da177e4 | 7209 | { |
3dbd8c2e | 7210 | if (register_blkdev(MD_MAJOR, "md")) |
1da177e4 LT |
7211 | return -1; |
7212 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
3dbd8c2e | 7213 | unregister_blkdev(MD_MAJOR, "md"); |
1da177e4 LT |
7214 | return -1; |
7215 | } | |
3dbd8c2e | 7216 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
e8703fe1 N |
7217 | md_probe, NULL, NULL); |
7218 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
7219 | md_probe, NULL, NULL); |
7220 | ||
1da177e4 | 7221 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 7222 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
7223 | |
7224 | md_geninit(); | |
d710e138 | 7225 | return 0; |
1da177e4 LT |
7226 | } |
7227 | ||
7228 | ||
7229 | #ifndef MODULE | |
7230 | ||
7231 | /* | |
7232 | * Searches all registered partitions for autorun RAID arrays | |
7233 | * at boot time. | |
7234 | */ | |
4d936ec1 ME |
7235 | |
7236 | static LIST_HEAD(all_detected_devices); | |
7237 | struct detected_devices_node { | |
7238 | struct list_head list; | |
7239 | dev_t dev; | |
7240 | }; | |
1da177e4 LT |
7241 | |
7242 | void md_autodetect_dev(dev_t dev) | |
7243 | { | |
4d936ec1 ME |
7244 | struct detected_devices_node *node_detected_dev; |
7245 | ||
7246 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
7247 | if (node_detected_dev) { | |
7248 | node_detected_dev->dev = dev; | |
7249 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
7250 | } else { | |
7251 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
7252 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
7253 | } | |
1da177e4 LT |
7254 | } |
7255 | ||
7256 | ||
7257 | static void autostart_arrays(int part) | |
7258 | { | |
7259 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
7260 | struct detected_devices_node *node_detected_dev; |
7261 | dev_t dev; | |
7262 | int i_scanned, i_passed; | |
1da177e4 | 7263 | |
4d936ec1 ME |
7264 | i_scanned = 0; |
7265 | i_passed = 0; | |
1da177e4 | 7266 | |
4d936ec1 | 7267 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 7268 | |
4d936ec1 ME |
7269 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
7270 | i_scanned++; | |
7271 | node_detected_dev = list_entry(all_detected_devices.next, | |
7272 | struct detected_devices_node, list); | |
7273 | list_del(&node_detected_dev->list); | |
7274 | dev = node_detected_dev->dev; | |
7275 | kfree(node_detected_dev); | |
df968c4e | 7276 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
7277 | if (IS_ERR(rdev)) |
7278 | continue; | |
7279 | ||
b2d444d7 | 7280 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
7281 | MD_BUG(); |
7282 | continue; | |
7283 | } | |
d0fae18f | 7284 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 7285 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 7286 | i_passed++; |
1da177e4 | 7287 | } |
4d936ec1 ME |
7288 | |
7289 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
7290 | i_scanned, i_passed); | |
1da177e4 LT |
7291 | |
7292 | autorun_devices(part); | |
7293 | } | |
7294 | ||
fdee8ae4 | 7295 | #endif /* !MODULE */ |
1da177e4 LT |
7296 | |
7297 | static __exit void md_exit(void) | |
7298 | { | |
7299 | mddev_t *mddev; | |
7300 | struct list_head *tmp; | |
8ab5e4c1 | 7301 | |
3dbd8c2e | 7302 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
e8703fe1 | 7303 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 7304 | |
3dbd8c2e | 7305 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
7306 | unregister_blkdev(mdp_major, "mdp"); |
7307 | unregister_reboot_notifier(&md_notifier); | |
7308 | unregister_sysctl_table(raid_table_header); | |
7309 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 7310 | for_each_mddev(mddev, tmp) { |
1da177e4 | 7311 | export_array(mddev); |
d3374825 | 7312 | mddev->hold_active = 0; |
1da177e4 LT |
7313 | } |
7314 | } | |
7315 | ||
685784aa | 7316 | subsys_initcall(md_init); |
1da177e4 LT |
7317 | module_exit(md_exit) |
7318 | ||
f91de92e N |
7319 | static int get_ro(char *buffer, struct kernel_param *kp) |
7320 | { | |
7321 | return sprintf(buffer, "%d", start_readonly); | |
7322 | } | |
7323 | static int set_ro(const char *val, struct kernel_param *kp) | |
7324 | { | |
7325 | char *e; | |
7326 | int num = simple_strtoul(val, &e, 10); | |
7327 | if (*val && (*e == '\0' || *e == '\n')) { | |
7328 | start_readonly = num; | |
4dbcdc75 | 7329 | return 0; |
f91de92e N |
7330 | } |
7331 | return -EINVAL; | |
7332 | } | |
7333 | ||
80ca3a44 N |
7334 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
7335 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 7336 | |
efeb53c0 | 7337 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 7338 | |
1da177e4 LT |
7339 | EXPORT_SYMBOL(register_md_personality); |
7340 | EXPORT_SYMBOL(unregister_md_personality); | |
7341 | EXPORT_SYMBOL(md_error); | |
7342 | EXPORT_SYMBOL(md_done_sync); | |
7343 | EXPORT_SYMBOL(md_write_start); | |
7344 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
7345 | EXPORT_SYMBOL(md_register_thread); |
7346 | EXPORT_SYMBOL(md_unregister_thread); | |
7347 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
7348 | EXPORT_SYMBOL(md_check_recovery); |
7349 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 7350 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 7351 | MODULE_ALIAS("md"); |
72008652 | 7352 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |