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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>
ff01bb48 39#include <linux/fs.h>
d7603b7e 40#include <linux/poll.h>
16f17b39 41#include <linux/ctype.h>
e7d2860b 42#include <linux/string.h>
fb4d8c76
N
43#include <linux/hdreg.h>
44#include <linux/proc_fs.h>
45#include <linux/random.h>
056075c7 46#include <linux/module.h>
fb4d8c76 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 56
1da177e4 57#ifndef MODULE
d710e138 58static void autostart_arrays(int part);
1da177e4
LT
59#endif
60
01f96c0a
N
61/* pers_list is a list of registered personalities protected
62 * by pers_lock.
63 * pers_lock does extra service to protect accesses to
64 * mddev->thread when the mutex cannot be held.
65 */
2604b703 66static LIST_HEAD(pers_list);
1da177e4
LT
67static DEFINE_SPINLOCK(pers_lock);
68
5e56341d
AB
69static void md_print_devices(void);
70
90b08710 71static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
e804ac78
TH
72static struct workqueue_struct *md_wq;
73static struct workqueue_struct *md_misc_wq;
90b08710 74
746d3207
N
75static int remove_and_add_spares(struct mddev *mddev,
76 struct md_rdev *this);
77
5e56341d
AB
78#define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
79
1e50915f
RB
80/*
81 * Default number of read corrections we'll attempt on an rdev
82 * before ejecting it from the array. We divide the read error
83 * count by 2 for every hour elapsed between read errors.
84 */
85#define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
1da177e4
LT
86/*
87 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
88 * is 1000 KB/sec, so the extra system load does not show up that much.
89 * Increase it if you want to have more _guaranteed_ speed. Note that
338cec32 90 * the RAID driver will use the maximum available bandwidth if the IO
1da177e4
LT
91 * subsystem is idle. There is also an 'absolute maximum' reconstruction
92 * speed limit - in case reconstruction slows down your system despite
93 * idle IO detection.
94 *
95 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
88202a0c 96 * or /sys/block/mdX/md/sync_speed_{min,max}
1da177e4
LT
97 */
98
99static int sysctl_speed_limit_min = 1000;
100static int sysctl_speed_limit_max = 200000;
fd01b88c 101static inline int speed_min(struct mddev *mddev)
88202a0c
N
102{
103 return mddev->sync_speed_min ?
104 mddev->sync_speed_min : sysctl_speed_limit_min;
105}
106
fd01b88c 107static inline int speed_max(struct mddev *mddev)
88202a0c
N
108{
109 return mddev->sync_speed_max ?
110 mddev->sync_speed_max : sysctl_speed_limit_max;
111}
1da177e4
LT
112
113static struct ctl_table_header *raid_table_header;
114
82592c38 115static struct ctl_table raid_table[] = {
1da177e4 116 {
1da177e4
LT
117 .procname = "speed_limit_min",
118 .data = &sysctl_speed_limit_min,
119 .maxlen = sizeof(int),
80ca3a44 120 .mode = S_IRUGO|S_IWUSR,
6d456111 121 .proc_handler = proc_dointvec,
1da177e4
LT
122 },
123 {
1da177e4
LT
124 .procname = "speed_limit_max",
125 .data = &sysctl_speed_limit_max,
126 .maxlen = sizeof(int),
80ca3a44 127 .mode = S_IRUGO|S_IWUSR,
6d456111 128 .proc_handler = proc_dointvec,
1da177e4 129 },
894d2491 130 { }
1da177e4
LT
131};
132
82592c38 133static struct ctl_table raid_dir_table[] = {
1da177e4 134 {
1da177e4
LT
135 .procname = "raid",
136 .maxlen = 0,
80ca3a44 137 .mode = S_IRUGO|S_IXUGO,
1da177e4
LT
138 .child = raid_table,
139 },
894d2491 140 { }
1da177e4
LT
141};
142
82592c38 143static struct ctl_table raid_root_table[] = {
1da177e4 144 {
1da177e4
LT
145 .procname = "dev",
146 .maxlen = 0,
147 .mode = 0555,
148 .child = raid_dir_table,
149 },
894d2491 150 { }
1da177e4
LT
151};
152
83d5cde4 153static const struct block_device_operations md_fops;
1da177e4 154
f91de92e
N
155static int start_readonly;
156
a167f663
N
157/* bio_clone_mddev
158 * like bio_clone, but with a local bio set
159 */
160
a167f663 161struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
fd01b88c 162 struct mddev *mddev)
a167f663
N
163{
164 struct bio *b;
a167f663
N
165
166 if (!mddev || !mddev->bio_set)
167 return bio_alloc(gfp_mask, nr_iovecs);
168
395c72a7 169 b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set);
a167f663
N
170 if (!b)
171 return NULL;
a167f663
N
172 return b;
173}
174EXPORT_SYMBOL_GPL(bio_alloc_mddev);
175
176struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
fd01b88c 177 struct mddev *mddev)
a167f663 178{
a167f663
N
179 if (!mddev || !mddev->bio_set)
180 return bio_clone(bio, gfp_mask);
181
bf800ef1 182 return bio_clone_bioset(bio, gfp_mask, mddev->bio_set);
a167f663
N
183}
184EXPORT_SYMBOL_GPL(bio_clone_mddev);
185
d7603b7e
N
186/*
187 * We have a system wide 'event count' that is incremented
188 * on any 'interesting' event, and readers of /proc/mdstat
189 * can use 'poll' or 'select' to find out when the event
190 * count increases.
191 *
192 * Events are:
193 * start array, stop array, error, add device, remove device,
194 * start build, activate spare
195 */
2989ddbd 196static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
d7603b7e 197static atomic_t md_event_count;
fd01b88c 198void md_new_event(struct mddev *mddev)
d7603b7e
N
199{
200 atomic_inc(&md_event_count);
201 wake_up(&md_event_waiters);
202}
29269553 203EXPORT_SYMBOL_GPL(md_new_event);
d7603b7e 204
c331eb04
N
205/* Alternate version that can be called from interrupts
206 * when calling sysfs_notify isn't needed.
207 */
fd01b88c 208static void md_new_event_inintr(struct mddev *mddev)
c331eb04
N
209{
210 atomic_inc(&md_event_count);
211 wake_up(&md_event_waiters);
212}
213
1da177e4
LT
214/*
215 * Enables to iterate over all existing md arrays
216 * all_mddevs_lock protects this list.
217 */
218static LIST_HEAD(all_mddevs);
219static DEFINE_SPINLOCK(all_mddevs_lock);
220
221
222/*
223 * iterates through all used mddevs in the system.
224 * We take care to grab the all_mddevs_lock whenever navigating
225 * the list, and to always hold a refcount when unlocked.
226 * Any code which breaks out of this loop while own
227 * a reference to the current mddev and must mddev_put it.
228 */
fd01b88c 229#define for_each_mddev(_mddev,_tmp) \
1da177e4
LT
230 \
231 for (({ spin_lock(&all_mddevs_lock); \
fd01b88c
N
232 _tmp = all_mddevs.next; \
233 _mddev = NULL;}); \
234 ({ if (_tmp != &all_mddevs) \
235 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
1da177e4 236 spin_unlock(&all_mddevs_lock); \
fd01b88c
N
237 if (_mddev) mddev_put(_mddev); \
238 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
239 _tmp != &all_mddevs;}); \
1da177e4 240 ({ spin_lock(&all_mddevs_lock); \
fd01b88c 241 _tmp = _tmp->next;}) \
1da177e4
LT
242 )
243
244
409c57f3
N
245/* Rather than calling directly into the personality make_request function,
246 * IO requests come here first so that we can check if the device is
247 * being suspended pending a reconfiguration.
248 * We hold a refcount over the call to ->make_request. By the time that
249 * call has finished, the bio has been linked into some internal structure
250 * and so is visible to ->quiesce(), so we don't need the refcount any more.
251 */
5a7bbad2 252static void md_make_request(struct request_queue *q, struct bio *bio)
1da177e4 253{
49077326 254 const int rw = bio_data_dir(bio);
fd01b88c 255 struct mddev *mddev = q->queuedata;
49077326 256 int cpu;
e91ece55 257 unsigned int sectors;
49077326 258
0ca69886
N
259 if (mddev == NULL || mddev->pers == NULL
260 || !mddev->ready) {
409c57f3 261 bio_io_error(bio);
5a7bbad2 262 return;
409c57f3 263 }
bbfa57c0
SR
264 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
265 bio_endio(bio, bio_sectors(bio) == 0 ? 0 : -EROFS);
266 return;
267 }
0ca69886 268 smp_rmb(); /* Ensure implications of 'active' are visible */
409c57f3 269 rcu_read_lock();
e9c7469b 270 if (mddev->suspended) {
409c57f3
N
271 DEFINE_WAIT(__wait);
272 for (;;) {
273 prepare_to_wait(&mddev->sb_wait, &__wait,
274 TASK_UNINTERRUPTIBLE);
e9c7469b 275 if (!mddev->suspended)
409c57f3
N
276 break;
277 rcu_read_unlock();
278 schedule();
279 rcu_read_lock();
280 }
281 finish_wait(&mddev->sb_wait, &__wait);
282 }
283 atomic_inc(&mddev->active_io);
284 rcu_read_unlock();
49077326 285
e91ece55
CM
286 /*
287 * save the sectors now since our bio can
288 * go away inside make_request
289 */
290 sectors = bio_sectors(bio);
5a7bbad2 291 mddev->pers->make_request(mddev, bio);
49077326
N
292
293 cpu = part_stat_lock();
294 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
e91ece55 295 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
49077326
N
296 part_stat_unlock();
297
409c57f3
N
298 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
299 wake_up(&mddev->sb_wait);
409c57f3
N
300}
301
9e35b99c
N
302/* mddev_suspend makes sure no new requests are submitted
303 * to the device, and that any requests that have been submitted
304 * are completely handled.
305 * Once ->stop is called and completes, the module will be completely
306 * unused.
307 */
fd01b88c 308void mddev_suspend(struct mddev *mddev)
409c57f3
N
309{
310 BUG_ON(mddev->suspended);
311 mddev->suspended = 1;
312 synchronize_rcu();
313 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
314 mddev->pers->quiesce(mddev, 1);
0d9f4f13
JB
315
316 del_timer_sync(&mddev->safemode_timer);
409c57f3 317}
390ee602 318EXPORT_SYMBOL_GPL(mddev_suspend);
409c57f3 319
fd01b88c 320void mddev_resume(struct mddev *mddev)
409c57f3
N
321{
322 mddev->suspended = 0;
323 wake_up(&mddev->sb_wait);
324 mddev->pers->quiesce(mddev, 0);
0fd018af 325
47525e59 326 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
0fd018af
JB
327 md_wakeup_thread(mddev->thread);
328 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
1da177e4 329}
390ee602 330EXPORT_SYMBOL_GPL(mddev_resume);
1da177e4 331
fd01b88c 332int mddev_congested(struct mddev *mddev, int bits)
3fa841d7
N
333{
334 return mddev->suspended;
335}
336EXPORT_SYMBOL(mddev_congested);
337
a2826aa9 338/*
e9c7469b 339 * Generic flush handling for md
a2826aa9
N
340 */
341
e9c7469b 342static void md_end_flush(struct bio *bio, int err)
a2826aa9 343{
3cb03002 344 struct md_rdev *rdev = bio->bi_private;
fd01b88c 345 struct mddev *mddev = rdev->mddev;
a2826aa9
N
346
347 rdev_dec_pending(rdev, mddev);
348
349 if (atomic_dec_and_test(&mddev->flush_pending)) {
e9c7469b 350 /* The pre-request flush has finished */
e804ac78 351 queue_work(md_wq, &mddev->flush_work);
a2826aa9
N
352 }
353 bio_put(bio);
354}
355
a7a07e69
N
356static void md_submit_flush_data(struct work_struct *ws);
357
a035fc3e 358static void submit_flushes(struct work_struct *ws)
a2826aa9 359{
fd01b88c 360 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
3cb03002 361 struct md_rdev *rdev;
a2826aa9 362
a7a07e69
N
363 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
364 atomic_set(&mddev->flush_pending, 1);
a2826aa9 365 rcu_read_lock();
dafb20fa 366 rdev_for_each_rcu(rdev, mddev)
a2826aa9
N
367 if (rdev->raid_disk >= 0 &&
368 !test_bit(Faulty, &rdev->flags)) {
369 /* Take two references, one is dropped
370 * when request finishes, one after
371 * we reclaim rcu_read_lock
372 */
373 struct bio *bi;
374 atomic_inc(&rdev->nr_pending);
375 atomic_inc(&rdev->nr_pending);
376 rcu_read_unlock();
b5e1b8ce 377 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
e9c7469b 378 bi->bi_end_io = md_end_flush;
a2826aa9
N
379 bi->bi_private = rdev;
380 bi->bi_bdev = rdev->bdev;
381 atomic_inc(&mddev->flush_pending);
e9c7469b 382 submit_bio(WRITE_FLUSH, bi);
a2826aa9
N
383 rcu_read_lock();
384 rdev_dec_pending(rdev, mddev);
385 }
386 rcu_read_unlock();
a7a07e69
N
387 if (atomic_dec_and_test(&mddev->flush_pending))
388 queue_work(md_wq, &mddev->flush_work);
a2826aa9
N
389}
390
e9c7469b 391static void md_submit_flush_data(struct work_struct *ws)
a2826aa9 392{
fd01b88c 393 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
e9c7469b 394 struct bio *bio = mddev->flush_bio;
a2826aa9 395
4f024f37 396 if (bio->bi_iter.bi_size == 0)
a2826aa9
N
397 /* an empty barrier - all done */
398 bio_endio(bio, 0);
399 else {
e9c7469b 400 bio->bi_rw &= ~REQ_FLUSH;
5a7bbad2 401 mddev->pers->make_request(mddev, bio);
a2826aa9 402 }
2b74e12e
N
403
404 mddev->flush_bio = NULL;
405 wake_up(&mddev->sb_wait);
a2826aa9
N
406}
407
fd01b88c 408void md_flush_request(struct mddev *mddev, struct bio *bio)
a2826aa9
N
409{
410 spin_lock_irq(&mddev->write_lock);
411 wait_event_lock_irq(mddev->sb_wait,
e9c7469b 412 !mddev->flush_bio,
eed8c02e 413 mddev->write_lock);
e9c7469b 414 mddev->flush_bio = bio;
a2826aa9
N
415 spin_unlock_irq(&mddev->write_lock);
416
a035fc3e
N
417 INIT_WORK(&mddev->flush_work, submit_flushes);
418 queue_work(md_wq, &mddev->flush_work);
a2826aa9 419}
e9c7469b 420EXPORT_SYMBOL(md_flush_request);
409c57f3 421
74018dc3 422void md_unplug(struct blk_plug_cb *cb, bool from_schedule)
97658cdd 423{
9cbb1750
N
424 struct mddev *mddev = cb->data;
425 md_wakeup_thread(mddev->thread);
426 kfree(cb);
97658cdd 427}
9cbb1750 428EXPORT_SYMBOL(md_unplug);
2ac87401 429
fd01b88c 430static inline struct mddev *mddev_get(struct mddev *mddev)
1da177e4
LT
431{
432 atomic_inc(&mddev->active);
433 return mddev;
434}
435
5fd3a17e 436static void mddev_delayed_delete(struct work_struct *ws);
d3374825 437
fd01b88c 438static void mddev_put(struct mddev *mddev)
1da177e4 439{
a167f663
N
440 struct bio_set *bs = NULL;
441
1da177e4
LT
442 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
443 return;
d3374825 444 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
cbd19983
N
445 mddev->ctime == 0 && !mddev->hold_active) {
446 /* Array is not configured at all, and not held active,
447 * so destroy it */
af8a2434 448 list_del_init(&mddev->all_mddevs);
a167f663
N
449 bs = mddev->bio_set;
450 mddev->bio_set = NULL;
d3374825 451 if (mddev->gendisk) {
e804ac78
TH
452 /* We did a probe so need to clean up. Call
453 * queue_work inside the spinlock so that
454 * flush_workqueue() after mddev_find will
455 * succeed in waiting for the work to be done.
d3374825
N
456 */
457 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
e804ac78 458 queue_work(md_misc_wq, &mddev->del_work);
d3374825
N
459 } else
460 kfree(mddev);
461 }
462 spin_unlock(&all_mddevs_lock);
a167f663
N
463 if (bs)
464 bioset_free(bs);
1da177e4
LT
465}
466
fd01b88c 467void mddev_init(struct mddev *mddev)
fafd7fb0
N
468{
469 mutex_init(&mddev->open_mutex);
470 mutex_init(&mddev->reconfig_mutex);
471 mutex_init(&mddev->bitmap_info.mutex);
472 INIT_LIST_HEAD(&mddev->disks);
473 INIT_LIST_HEAD(&mddev->all_mddevs);
474 init_timer(&mddev->safemode_timer);
475 atomic_set(&mddev->active, 1);
476 atomic_set(&mddev->openers, 0);
477 atomic_set(&mddev->active_io, 0);
478 spin_lock_init(&mddev->write_lock);
479 atomic_set(&mddev->flush_pending, 0);
480 init_waitqueue_head(&mddev->sb_wait);
481 init_waitqueue_head(&mddev->recovery_wait);
482 mddev->reshape_position = MaxSector;
2c810cdd 483 mddev->reshape_backwards = 0;
c4a39551 484 mddev->last_sync_action = "none";
fafd7fb0
N
485 mddev->resync_min = 0;
486 mddev->resync_max = MaxSector;
487 mddev->level = LEVEL_NONE;
488}
390ee602 489EXPORT_SYMBOL_GPL(mddev_init);
fafd7fb0 490
fd01b88c 491static struct mddev * mddev_find(dev_t unit)
1da177e4 492{
fd01b88c 493 struct mddev *mddev, *new = NULL;
1da177e4 494
8f5f02c4
N
495 if (unit && MAJOR(unit) != MD_MAJOR)
496 unit &= ~((1<<MdpMinorShift)-1);
497
1da177e4
LT
498 retry:
499 spin_lock(&all_mddevs_lock);
efeb53c0
N
500
501 if (unit) {
502 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
503 if (mddev->unit == unit) {
504 mddev_get(mddev);
505 spin_unlock(&all_mddevs_lock);
506 kfree(new);
507 return mddev;
508 }
509
510 if (new) {
511 list_add(&new->all_mddevs, &all_mddevs);
1da177e4 512 spin_unlock(&all_mddevs_lock);
efeb53c0
N
513 new->hold_active = UNTIL_IOCTL;
514 return new;
1da177e4 515 }
efeb53c0
N
516 } else if (new) {
517 /* find an unused unit number */
518 static int next_minor = 512;
519 int start = next_minor;
520 int is_free = 0;
521 int dev = 0;
522 while (!is_free) {
523 dev = MKDEV(MD_MAJOR, next_minor);
524 next_minor++;
525 if (next_minor > MINORMASK)
526 next_minor = 0;
527 if (next_minor == start) {
528 /* Oh dear, all in use. */
529 spin_unlock(&all_mddevs_lock);
530 kfree(new);
531 return NULL;
532 }
533
534 is_free = 1;
535 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
536 if (mddev->unit == dev) {
537 is_free = 0;
538 break;
539 }
540 }
541 new->unit = dev;
542 new->md_minor = MINOR(dev);
543 new->hold_active = UNTIL_STOP;
1da177e4
LT
544 list_add(&new->all_mddevs, &all_mddevs);
545 spin_unlock(&all_mddevs_lock);
546 return new;
547 }
548 spin_unlock(&all_mddevs_lock);
549
9ffae0cf 550 new = kzalloc(sizeof(*new), GFP_KERNEL);
1da177e4
LT
551 if (!new)
552 return NULL;
553
1da177e4
LT
554 new->unit = unit;
555 if (MAJOR(unit) == MD_MAJOR)
556 new->md_minor = MINOR(unit);
557 else
558 new->md_minor = MINOR(unit) >> MdpMinorShift;
559
fafd7fb0 560 mddev_init(new);
1da177e4 561
1da177e4
LT
562 goto retry;
563}
564
29f097c4 565static inline int __must_check mddev_lock(struct mddev * mddev)
1da177e4 566{
df5b89b3 567 return mutex_lock_interruptible(&mddev->reconfig_mutex);
1da177e4
LT
568}
569
29f097c4
N
570/* Sometimes we need to take the lock in a situation where
571 * failure due to interrupts is not acceptable.
572 */
573static inline void mddev_lock_nointr(struct mddev * mddev)
574{
575 mutex_lock(&mddev->reconfig_mutex);
576}
577
fd01b88c 578static inline int mddev_is_locked(struct mddev *mddev)
b522adcd
DW
579{
580 return mutex_is_locked(&mddev->reconfig_mutex);
581}
582
fd01b88c 583static inline int mddev_trylock(struct mddev * mddev)
1da177e4 584{
df5b89b3 585 return mutex_trylock(&mddev->reconfig_mutex);
1da177e4
LT
586}
587
b6eb127d
N
588static struct attribute_group md_redundancy_group;
589
fd01b88c 590static void mddev_unlock(struct mddev * mddev)
1da177e4 591{
a64c876f 592 if (mddev->to_remove) {
b6eb127d
N
593 /* These cannot be removed under reconfig_mutex as
594 * an access to the files will try to take reconfig_mutex
595 * while holding the file unremovable, which leads to
596 * a deadlock.
bb4f1e9d
N
597 * So hold set sysfs_active while the remove in happeing,
598 * and anything else which might set ->to_remove or my
599 * otherwise change the sysfs namespace will fail with
600 * -EBUSY if sysfs_active is still set.
601 * We set sysfs_active under reconfig_mutex and elsewhere
602 * test it under the same mutex to ensure its correct value
603 * is seen.
b6eb127d 604 */
a64c876f
N
605 struct attribute_group *to_remove = mddev->to_remove;
606 mddev->to_remove = NULL;
bb4f1e9d 607 mddev->sysfs_active = 1;
b6eb127d
N
608 mutex_unlock(&mddev->reconfig_mutex);
609
00bcb4ac
N
610 if (mddev->kobj.sd) {
611 if (to_remove != &md_redundancy_group)
612 sysfs_remove_group(&mddev->kobj, to_remove);
613 if (mddev->pers == NULL ||
614 mddev->pers->sync_request == NULL) {
615 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
616 if (mddev->sysfs_action)
617 sysfs_put(mddev->sysfs_action);
618 mddev->sysfs_action = NULL;
619 }
a64c876f 620 }
bb4f1e9d 621 mddev->sysfs_active = 0;
b6eb127d
N
622 } else
623 mutex_unlock(&mddev->reconfig_mutex);
1da177e4 624
751e67ca
CD
625 /* As we've dropped the mutex we need a spinlock to
626 * make sure the thread doesn't disappear
01f96c0a
N
627 */
628 spin_lock(&pers_lock);
005eca5e 629 md_wakeup_thread(mddev->thread);
01f96c0a 630 spin_unlock(&pers_lock);
1da177e4
LT
631}
632
fd01b88c 633static struct md_rdev * find_rdev_nr(struct mddev *mddev, int nr)
1da177e4 634{
3cb03002 635 struct md_rdev *rdev;
1da177e4 636
dafb20fa 637 rdev_for_each(rdev, mddev)
1da177e4
LT
638 if (rdev->desc_nr == nr)
639 return rdev;
159ec1fc 640
1da177e4
LT
641 return NULL;
642}
643
1ca69c4b
N
644static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr)
645{
646 struct md_rdev *rdev;
647
648 rdev_for_each_rcu(rdev, mddev)
649 if (rdev->desc_nr == nr)
650 return rdev;
651
652 return NULL;
653}
654
655static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
1da177e4 656{
3cb03002 657 struct md_rdev *rdev;
1da177e4 658
dafb20fa 659 rdev_for_each(rdev, mddev)
1da177e4
LT
660 if (rdev->bdev->bd_dev == dev)
661 return rdev;
159ec1fc 662
1da177e4
LT
663 return NULL;
664}
665
1ca69c4b
N
666static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev)
667{
668 struct md_rdev *rdev;
669
670 rdev_for_each_rcu(rdev, mddev)
671 if (rdev->bdev->bd_dev == dev)
672 return rdev;
673
674 return NULL;
675}
676
84fc4b56 677static struct md_personality *find_pers(int level, char *clevel)
2604b703 678{
84fc4b56 679 struct md_personality *pers;
d9d166c2
N
680 list_for_each_entry(pers, &pers_list, list) {
681 if (level != LEVEL_NONE && pers->level == level)
2604b703 682 return pers;
d9d166c2
N
683 if (strcmp(pers->name, clevel)==0)
684 return pers;
685 }
2604b703
N
686 return NULL;
687}
688
b73df2d3 689/* return the offset of the super block in 512byte sectors */
3cb03002 690static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
1da177e4 691{
57b2caa3 692 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
b73df2d3 693 return MD_NEW_SIZE_SECTORS(num_sectors);
1da177e4
LT
694}
695
3cb03002 696static int alloc_disk_sb(struct md_rdev * rdev)
1da177e4
LT
697{
698 if (rdev->sb_page)
699 MD_BUG();
700
701 rdev->sb_page = alloc_page(GFP_KERNEL);
702 if (!rdev->sb_page) {
703 printk(KERN_ALERT "md: out of memory.\n");
ebc24337 704 return -ENOMEM;
1da177e4
LT
705 }
706
707 return 0;
708}
709
545c8795 710void md_rdev_clear(struct md_rdev *rdev)
1da177e4
LT
711{
712 if (rdev->sb_page) {
2d1f3b5d 713 put_page(rdev->sb_page);
1da177e4
LT
714 rdev->sb_loaded = 0;
715 rdev->sb_page = NULL;
0f420358 716 rdev->sb_start = 0;
dd8ac336 717 rdev->sectors = 0;
1da177e4 718 }
2699b672
N
719 if (rdev->bb_page) {
720 put_page(rdev->bb_page);
721 rdev->bb_page = NULL;
722 }
4fa2f327
N
723 kfree(rdev->badblocks.page);
724 rdev->badblocks.page = NULL;
1da177e4 725}
545c8795 726EXPORT_SYMBOL_GPL(md_rdev_clear);
1da177e4 727
6712ecf8 728static void super_written(struct bio *bio, int error)
7bfa19f2 729{
3cb03002 730 struct md_rdev *rdev = bio->bi_private;
fd01b88c 731 struct mddev *mddev = rdev->mddev;
7bfa19f2 732
3a0f5bbb
N
733 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
734 printk("md: super_written gets error=%d, uptodate=%d\n",
735 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
736 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
a9701a30 737 md_error(mddev, rdev);
3a0f5bbb 738 }
7bfa19f2 739
a9701a30
N
740 if (atomic_dec_and_test(&mddev->pending_writes))
741 wake_up(&mddev->sb_wait);
f8b58edf 742 bio_put(bio);
7bfa19f2
N
743}
744
fd01b88c 745void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
7bfa19f2
N
746 sector_t sector, int size, struct page *page)
747{
748 /* write first size bytes of page to sector of rdev
749 * Increment mddev->pending_writes before returning
750 * and decrement it on completion, waking up sb_wait
751 * if zero is reached.
752 * If an error occurred, call md_error
753 */
a167f663 754 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
7bfa19f2 755
a6ff7e08 756 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
4f024f37 757 bio->bi_iter.bi_sector = sector;
7bfa19f2
N
758 bio_add_page(bio, page, size, 0);
759 bio->bi_private = rdev;
760 bio->bi_end_io = super_written;
a9701a30 761
7bfa19f2 762 atomic_inc(&mddev->pending_writes);
a5bf4df0 763 submit_bio(WRITE_FLUSH_FUA, bio);
a9701a30
N
764}
765
fd01b88c 766void md_super_wait(struct mddev *mddev)
a9701a30 767{
e9c7469b 768 /* wait for all superblock writes that were scheduled to complete */
a9701a30
N
769 DEFINE_WAIT(wq);
770 for(;;) {
771 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
772 if (atomic_read(&mddev->pending_writes)==0)
773 break;
a9701a30
N
774 schedule();
775 }
776 finish_wait(&mddev->sb_wait, &wq);
7bfa19f2
N
777}
778
3cb03002 779int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
ccebd4c4 780 struct page *page, int rw, bool metadata_op)
1da177e4 781{
a167f663 782 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
1da177e4
LT
783 int ret;
784
a6ff7e08
JB
785 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
786 rdev->meta_bdev : rdev->bdev;
ccebd4c4 787 if (metadata_op)
4f024f37 788 bio->bi_iter.bi_sector = sector + rdev->sb_start;
1fdd6fc9
N
789 else if (rdev->mddev->reshape_position != MaxSector &&
790 (rdev->mddev->reshape_backwards ==
791 (sector >= rdev->mddev->reshape_position)))
4f024f37 792 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
ccebd4c4 793 else
4f024f37 794 bio->bi_iter.bi_sector = sector + rdev->data_offset;
1da177e4 795 bio_add_page(bio, page, size, 0);
c170bbb4 796 submit_bio_wait(rw, bio);
1da177e4
LT
797
798 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
799 bio_put(bio);
800 return ret;
801}
a8745db2 802EXPORT_SYMBOL_GPL(sync_page_io);
1da177e4 803
3cb03002 804static int read_disk_sb(struct md_rdev * rdev, int size)
1da177e4
LT
805{
806 char b[BDEVNAME_SIZE];
807 if (!rdev->sb_page) {
808 MD_BUG();
809 return -EINVAL;
810 }
811 if (rdev->sb_loaded)
812 return 0;
813
814
ccebd4c4 815 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
1da177e4
LT
816 goto fail;
817 rdev->sb_loaded = 1;
818 return 0;
819
820fail:
821 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
822 bdevname(rdev->bdev,b));
823 return -EINVAL;
824}
825
826static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
827{
05710466
AN
828 return sb1->set_uuid0 == sb2->set_uuid0 &&
829 sb1->set_uuid1 == sb2->set_uuid1 &&
830 sb1->set_uuid2 == sb2->set_uuid2 &&
831 sb1->set_uuid3 == sb2->set_uuid3;
1da177e4
LT
832}
833
1da177e4
LT
834static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
835{
836 int ret;
837 mdp_super_t *tmp1, *tmp2;
838
839 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
840 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
841
842 if (!tmp1 || !tmp2) {
843 ret = 0;
35020f1a 844 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
1da177e4
LT
845 goto abort;
846 }
847
848 *tmp1 = *sb1;
849 *tmp2 = *sb2;
850
851 /*
852 * nr_disks is not constant
853 */
854 tmp1->nr_disks = 0;
855 tmp2->nr_disks = 0;
856
ce0c8e05 857 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
1da177e4 858abort:
990a8baf
JJ
859 kfree(tmp1);
860 kfree(tmp2);
1da177e4
LT
861 return ret;
862}
863
4d167f09
N
864
865static u32 md_csum_fold(u32 csum)
866{
867 csum = (csum & 0xffff) + (csum >> 16);
868 return (csum & 0xffff) + (csum >> 16);
869}
870
1da177e4
LT
871static unsigned int calc_sb_csum(mdp_super_t * sb)
872{
4d167f09
N
873 u64 newcsum = 0;
874 u32 *sb32 = (u32*)sb;
875 int i;
1da177e4
LT
876 unsigned int disk_csum, csum;
877
878 disk_csum = sb->sb_csum;
879 sb->sb_csum = 0;
4d167f09
N
880
881 for (i = 0; i < MD_SB_BYTES/4 ; i++)
882 newcsum += sb32[i];
883 csum = (newcsum & 0xffffffff) + (newcsum>>32);
884
885
886#ifdef CONFIG_ALPHA
887 /* This used to use csum_partial, which was wrong for several
888 * reasons including that different results are returned on
889 * different architectures. It isn't critical that we get exactly
890 * the same return value as before (we always csum_fold before
891 * testing, and that removes any differences). However as we
892 * know that csum_partial always returned a 16bit value on
893 * alphas, do a fold to maximise conformity to previous behaviour.
894 */
895 sb->sb_csum = md_csum_fold(disk_csum);
896#else
1da177e4 897 sb->sb_csum = disk_csum;
4d167f09 898#endif
1da177e4
LT
899 return csum;
900}
901
902
903/*
904 * Handle superblock details.
905 * We want to be able to handle multiple superblock formats
906 * so we have a common interface to them all, and an array of
907 * different handlers.
908 * We rely on user-space to write the initial superblock, and support
909 * reading and updating of superblocks.
910 * Interface methods are:
3cb03002 911 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1da177e4
LT
912 * loads and validates a superblock on dev.
913 * if refdev != NULL, compare superblocks on both devices
914 * Return:
915 * 0 - dev has a superblock that is compatible with refdev
916 * 1 - dev has a superblock that is compatible and newer than refdev
917 * so dev should be used as the refdev in future
918 * -EINVAL superblock incompatible or invalid
919 * -othererror e.g. -EIO
920 *
fd01b88c 921 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1da177e4
LT
922 * Verify that dev is acceptable into mddev.
923 * The first time, mddev->raid_disks will be 0, and data from
924 * dev should be merged in. Subsequent calls check that dev
925 * is new enough. Return 0 or -EINVAL
926 *
fd01b88c 927 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1da177e4
LT
928 * Update the superblock for rdev with data in mddev
929 * This does not write to disc.
930 *
931 */
932
933struct super_type {
0cd17fec
CW
934 char *name;
935 struct module *owner;
c6563a8c
N
936 int (*load_super)(struct md_rdev *rdev,
937 struct md_rdev *refdev,
0cd17fec 938 int minor_version);
c6563a8c
N
939 int (*validate_super)(struct mddev *mddev,
940 struct md_rdev *rdev);
941 void (*sync_super)(struct mddev *mddev,
942 struct md_rdev *rdev);
3cb03002 943 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
15f4a5fd 944 sector_t num_sectors);
c6563a8c
N
945 int (*allow_new_offset)(struct md_rdev *rdev,
946 unsigned long long new_offset);
1da177e4
LT
947};
948
0894cc30
AN
949/*
950 * Check that the given mddev has no bitmap.
951 *
952 * This function is called from the run method of all personalities that do not
953 * support bitmaps. It prints an error message and returns non-zero if mddev
954 * has a bitmap. Otherwise, it returns 0.
955 *
956 */
fd01b88c 957int md_check_no_bitmap(struct mddev *mddev)
0894cc30 958{
c3d9714e 959 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
0894cc30
AN
960 return 0;
961 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
962 mdname(mddev), mddev->pers->name);
963 return 1;
964}
965EXPORT_SYMBOL(md_check_no_bitmap);
966
1da177e4
LT
967/*
968 * load_super for 0.90.0
969 */
3cb03002 970static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1da177e4
LT
971{
972 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
973 mdp_super_t *sb;
974 int ret;
1da177e4
LT
975
976 /*
0f420358 977 * Calculate the position of the superblock (512byte sectors),
1da177e4
LT
978 * it's at the end of the disk.
979 *
980 * It also happens to be a multiple of 4Kb.
981 */
57b2caa3 982 rdev->sb_start = calc_dev_sboffset(rdev);
1da177e4 983
0002b271 984 ret = read_disk_sb(rdev, MD_SB_BYTES);
1da177e4
LT
985 if (ret) return ret;
986
987 ret = -EINVAL;
988
989 bdevname(rdev->bdev, b);
65a06f06 990 sb = page_address(rdev->sb_page);
1da177e4
LT
991
992 if (sb->md_magic != MD_SB_MAGIC) {
993 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
994 b);
995 goto abort;
996 }
997
998 if (sb->major_version != 0 ||
f6705578
N
999 sb->minor_version < 90 ||
1000 sb->minor_version > 91) {
1da177e4
LT
1001 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
1002 sb->major_version, sb->minor_version,
1003 b);
1004 goto abort;
1005 }
1006
1007 if (sb->raid_disks <= 0)
1008 goto abort;
1009
4d167f09 1010 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1da177e4
LT
1011 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
1012 b);
1013 goto abort;
1014 }
1015
1016 rdev->preferred_minor = sb->md_minor;
1017 rdev->data_offset = 0;
c6563a8c 1018 rdev->new_data_offset = 0;
0002b271 1019 rdev->sb_size = MD_SB_BYTES;
9f2f3830 1020 rdev->badblocks.shift = -1;
1da177e4
LT
1021
1022 if (sb->level == LEVEL_MULTIPATH)
1023 rdev->desc_nr = -1;
1024 else
1025 rdev->desc_nr = sb->this_disk.number;
1026
9a7b2b0f 1027 if (!refdev) {
1da177e4 1028 ret = 1;
9a7b2b0f 1029 } else {
1da177e4 1030 __u64 ev1, ev2;
65a06f06 1031 mdp_super_t *refsb = page_address(refdev->sb_page);
1da177e4
LT
1032 if (!uuid_equal(refsb, sb)) {
1033 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1034 b, bdevname(refdev->bdev,b2));
1035 goto abort;
1036 }
1037 if (!sb_equal(refsb, sb)) {
1038 printk(KERN_WARNING "md: %s has same UUID"
1039 " but different superblock to %s\n",
1040 b, bdevname(refdev->bdev, b2));
1041 goto abort;
1042 }
1043 ev1 = md_event(sb);
1044 ev2 = md_event(refsb);
1045 if (ev1 > ev2)
1046 ret = 1;
1047 else
1048 ret = 0;
1049 }
8190e754 1050 rdev->sectors = rdev->sb_start;
667a5313
N
1051 /* Limit to 4TB as metadata cannot record more than that.
1052 * (not needed for Linear and RAID0 as metadata doesn't
1053 * record this size)
1054 */
1055 if (rdev->sectors >= (2ULL << 32) && sb->level >= 1)
27a7b260 1056 rdev->sectors = (2ULL << 32) - 2;
1da177e4 1057
27a7b260 1058 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
2bf071bf
N
1059 /* "this cannot possibly happen" ... */
1060 ret = -EINVAL;
1061
1da177e4
LT
1062 abort:
1063 return ret;
1064}
1065
1066/*
1067 * validate_super for 0.90.0
1068 */
fd01b88c 1069static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1da177e4
LT
1070{
1071 mdp_disk_t *desc;
65a06f06 1072 mdp_super_t *sb = page_address(rdev->sb_page);
07d84d10 1073 __u64 ev1 = md_event(sb);
1da177e4 1074
41158c7e 1075 rdev->raid_disk = -1;
c5d79adb
N
1076 clear_bit(Faulty, &rdev->flags);
1077 clear_bit(In_sync, &rdev->flags);
8313b8e5 1078 clear_bit(Bitmap_sync, &rdev->flags);
c5d79adb 1079 clear_bit(WriteMostly, &rdev->flags);
c5d79adb 1080
1da177e4
LT
1081 if (mddev->raid_disks == 0) {
1082 mddev->major_version = 0;
1083 mddev->minor_version = sb->minor_version;
1084 mddev->patch_version = sb->patch_version;
e691063a 1085 mddev->external = 0;
9d8f0363 1086 mddev->chunk_sectors = sb->chunk_size >> 9;
1da177e4
LT
1087 mddev->ctime = sb->ctime;
1088 mddev->utime = sb->utime;
1089 mddev->level = sb->level;
d9d166c2 1090 mddev->clevel[0] = 0;
1da177e4
LT
1091 mddev->layout = sb->layout;
1092 mddev->raid_disks = sb->raid_disks;
27a7b260 1093 mddev->dev_sectors = ((sector_t)sb->size) * 2;
07d84d10 1094 mddev->events = ev1;
c3d9714e 1095 mddev->bitmap_info.offset = 0;
6409bb05
N
1096 mddev->bitmap_info.space = 0;
1097 /* bitmap can use 60 K after the 4K superblocks */
c3d9714e 1098 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6409bb05 1099 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
2c810cdd 1100 mddev->reshape_backwards = 0;
1da177e4 1101
f6705578
N
1102 if (mddev->minor_version >= 91) {
1103 mddev->reshape_position = sb->reshape_position;
1104 mddev->delta_disks = sb->delta_disks;
1105 mddev->new_level = sb->new_level;
1106 mddev->new_layout = sb->new_layout;
664e7c41 1107 mddev->new_chunk_sectors = sb->new_chunk >> 9;
2c810cdd
N
1108 if (mddev->delta_disks < 0)
1109 mddev->reshape_backwards = 1;
f6705578
N
1110 } else {
1111 mddev->reshape_position = MaxSector;
1112 mddev->delta_disks = 0;
1113 mddev->new_level = mddev->level;
1114 mddev->new_layout = mddev->layout;
664e7c41 1115 mddev->new_chunk_sectors = mddev->chunk_sectors;
f6705578
N
1116 }
1117
1da177e4
LT
1118 if (sb->state & (1<<MD_SB_CLEAN))
1119 mddev->recovery_cp = MaxSector;
1120 else {
1121 if (sb->events_hi == sb->cp_events_hi &&
1122 sb->events_lo == sb->cp_events_lo) {
1123 mddev->recovery_cp = sb->recovery_cp;
1124 } else
1125 mddev->recovery_cp = 0;
1126 }
1127
1128 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1129 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1130 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1131 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1132
1133 mddev->max_disks = MD_SB_DISKS;
a654b9d8
N
1134
1135 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
6409bb05 1136 mddev->bitmap_info.file == NULL) {
c3d9714e
N
1137 mddev->bitmap_info.offset =
1138 mddev->bitmap_info.default_offset;
6409bb05 1139 mddev->bitmap_info.space =
c9ad020f 1140 mddev->bitmap_info.default_space;
6409bb05 1141 }
a654b9d8 1142
41158c7e 1143 } else if (mddev->pers == NULL) {
be6800a7
N
1144 /* Insist on good event counter while assembling, except
1145 * for spares (which don't need an event count) */
1da177e4 1146 ++ev1;
be6800a7
N
1147 if (sb->disks[rdev->desc_nr].state & (
1148 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1149 if (ev1 < mddev->events)
1150 return -EINVAL;
41158c7e
N
1151 } else if (mddev->bitmap) {
1152 /* if adding to array with a bitmap, then we can accept an
1153 * older device ... but not too old.
1154 */
41158c7e
N
1155 if (ev1 < mddev->bitmap->events_cleared)
1156 return 0;
8313b8e5
N
1157 if (ev1 < mddev->events)
1158 set_bit(Bitmap_sync, &rdev->flags);
07d84d10
N
1159 } else {
1160 if (ev1 < mddev->events)
1161 /* just a hot-add of a new device, leave raid_disk at -1 */
1162 return 0;
1163 }
41158c7e 1164
1da177e4 1165 if (mddev->level != LEVEL_MULTIPATH) {
1da177e4
LT
1166 desc = sb->disks + rdev->desc_nr;
1167
1168 if (desc->state & (1<<MD_DISK_FAULTY))
b2d444d7 1169 set_bit(Faulty, &rdev->flags);
7c7546cc
N
1170 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1171 desc->raid_disk < mddev->raid_disks */) {
b2d444d7 1172 set_bit(In_sync, &rdev->flags);
1da177e4 1173 rdev->raid_disk = desc->raid_disk;
f466722c 1174 rdev->saved_raid_disk = desc->raid_disk;
0261cd9f
N
1175 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1176 /* active but not in sync implies recovery up to
1177 * reshape position. We don't know exactly where
1178 * that is, so set to zero for now */
1179 if (mddev->minor_version >= 91) {
1180 rdev->recovery_offset = 0;
1181 rdev->raid_disk = desc->raid_disk;
1182 }
1da177e4 1183 }
8ddf9efe
N
1184 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1185 set_bit(WriteMostly, &rdev->flags);
41158c7e 1186 } else /* MULTIPATH are always insync */
b2d444d7 1187 set_bit(In_sync, &rdev->flags);
1da177e4
LT
1188 return 0;
1189}
1190
1191/*
1192 * sync_super for 0.90.0
1193 */
fd01b88c 1194static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1da177e4
LT
1195{
1196 mdp_super_t *sb;
3cb03002 1197 struct md_rdev *rdev2;
1da177e4 1198 int next_spare = mddev->raid_disks;
19133a42 1199
1da177e4
LT
1200
1201 /* make rdev->sb match mddev data..
1202 *
1203 * 1/ zero out disks
1204 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1205 * 3/ any empty disks < next_spare become removed
1206 *
1207 * disks[0] gets initialised to REMOVED because
1208 * we cannot be sure from other fields if it has
1209 * been initialised or not.
1210 */
1211 int i;
1212 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1213
61181565
N
1214 rdev->sb_size = MD_SB_BYTES;
1215
65a06f06 1216 sb = page_address(rdev->sb_page);
1da177e4
LT
1217
1218 memset(sb, 0, sizeof(*sb));
1219
1220 sb->md_magic = MD_SB_MAGIC;
1221 sb->major_version = mddev->major_version;
1da177e4
LT
1222 sb->patch_version = mddev->patch_version;
1223 sb->gvalid_words = 0; /* ignored */
1224 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1225 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1226 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1227 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1228
1229 sb->ctime = mddev->ctime;
1230 sb->level = mddev->level;
58c0fed4 1231 sb->size = mddev->dev_sectors / 2;
1da177e4
LT
1232 sb->raid_disks = mddev->raid_disks;
1233 sb->md_minor = mddev->md_minor;
e691063a 1234 sb->not_persistent = 0;
1da177e4
LT
1235 sb->utime = mddev->utime;
1236 sb->state = 0;
1237 sb->events_hi = (mddev->events>>32);
1238 sb->events_lo = (u32)mddev->events;
1239
f6705578
N
1240 if (mddev->reshape_position == MaxSector)
1241 sb->minor_version = 90;
1242 else {
1243 sb->minor_version = 91;
1244 sb->reshape_position = mddev->reshape_position;
1245 sb->new_level = mddev->new_level;
1246 sb->delta_disks = mddev->delta_disks;
1247 sb->new_layout = mddev->new_layout;
664e7c41 1248 sb->new_chunk = mddev->new_chunk_sectors << 9;
f6705578
N
1249 }
1250 mddev->minor_version = sb->minor_version;
1da177e4
LT
1251 if (mddev->in_sync)
1252 {
1253 sb->recovery_cp = mddev->recovery_cp;
1254 sb->cp_events_hi = (mddev->events>>32);
1255 sb->cp_events_lo = (u32)mddev->events;
1256 if (mddev->recovery_cp == MaxSector)
1257 sb->state = (1<< MD_SB_CLEAN);
1258 } else
1259 sb->recovery_cp = 0;
1260
1261 sb->layout = mddev->layout;
9d8f0363 1262 sb->chunk_size = mddev->chunk_sectors << 9;
1da177e4 1263
c3d9714e 1264 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
a654b9d8
N
1265 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1266
1da177e4 1267 sb->disks[0].state = (1<<MD_DISK_REMOVED);
dafb20fa 1268 rdev_for_each(rdev2, mddev) {
1da177e4 1269 mdp_disk_t *d;
86e6ffdd 1270 int desc_nr;
0261cd9f
N
1271 int is_active = test_bit(In_sync, &rdev2->flags);
1272
1273 if (rdev2->raid_disk >= 0 &&
1274 sb->minor_version >= 91)
1275 /* we have nowhere to store the recovery_offset,
1276 * but if it is not below the reshape_position,
1277 * we can piggy-back on that.
1278 */
1279 is_active = 1;
1280 if (rdev2->raid_disk < 0 ||
1281 test_bit(Faulty, &rdev2->flags))
1282 is_active = 0;
1283 if (is_active)
86e6ffdd 1284 desc_nr = rdev2->raid_disk;
1da177e4 1285 else
86e6ffdd 1286 desc_nr = next_spare++;
19133a42 1287 rdev2->desc_nr = desc_nr;
1da177e4
LT
1288 d = &sb->disks[rdev2->desc_nr];
1289 nr_disks++;
1290 d->number = rdev2->desc_nr;
1291 d->major = MAJOR(rdev2->bdev->bd_dev);
1292 d->minor = MINOR(rdev2->bdev->bd_dev);
0261cd9f 1293 if (is_active)
1da177e4
LT
1294 d->raid_disk = rdev2->raid_disk;
1295 else
1296 d->raid_disk = rdev2->desc_nr; /* compatibility */
1be7892f 1297 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1298 d->state = (1<<MD_DISK_FAULTY);
0261cd9f 1299 else if (is_active) {
1da177e4 1300 d->state = (1<<MD_DISK_ACTIVE);
0261cd9f
N
1301 if (test_bit(In_sync, &rdev2->flags))
1302 d->state |= (1<<MD_DISK_SYNC);
1da177e4
LT
1303 active++;
1304 working++;
1305 } else {
1306 d->state = 0;
1307 spare++;
1308 working++;
1309 }
8ddf9efe
N
1310 if (test_bit(WriteMostly, &rdev2->flags))
1311 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4 1312 }
1da177e4
LT
1313 /* now set the "removed" and "faulty" bits on any missing devices */
1314 for (i=0 ; i < mddev->raid_disks ; i++) {
1315 mdp_disk_t *d = &sb->disks[i];
1316 if (d->state == 0 && d->number == 0) {
1317 d->number = i;
1318 d->raid_disk = i;
1319 d->state = (1<<MD_DISK_REMOVED);
1320 d->state |= (1<<MD_DISK_FAULTY);
1321 failed++;
1322 }
1323 }
1324 sb->nr_disks = nr_disks;
1325 sb->active_disks = active;
1326 sb->working_disks = working;
1327 sb->failed_disks = failed;
1328 sb->spare_disks = spare;
1329
1330 sb->this_disk = sb->disks[rdev->desc_nr];
1331 sb->sb_csum = calc_sb_csum(sb);
1332}
1333
0cd17fec
CW
1334/*
1335 * rdev_size_change for 0.90.0
1336 */
1337static unsigned long long
3cb03002 1338super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
0cd17fec 1339{
58c0fed4 1340 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
0cd17fec 1341 return 0; /* component must fit device */
c3d9714e 1342 if (rdev->mddev->bitmap_info.offset)
0cd17fec 1343 return 0; /* can't move bitmap */
57b2caa3 1344 rdev->sb_start = calc_dev_sboffset(rdev);
15f4a5fd
AN
1345 if (!num_sectors || num_sectors > rdev->sb_start)
1346 num_sectors = rdev->sb_start;
27a7b260
N
1347 /* Limit to 4TB as metadata cannot record more than that.
1348 * 4TB == 2^32 KB, or 2*2^32 sectors.
1349 */
667a5313 1350 if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
27a7b260 1351 num_sectors = (2ULL << 32) - 2;
0f420358 1352 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
0cd17fec
CW
1353 rdev->sb_page);
1354 md_super_wait(rdev->mddev);
c26a44ed 1355 return num_sectors;
0cd17fec
CW
1356}
1357
c6563a8c
N
1358static int
1359super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1360{
1361 /* non-zero offset changes not possible with v0.90 */
1362 return new_offset == 0;
1363}
0cd17fec 1364
1da177e4
LT
1365/*
1366 * version 1 superblock
1367 */
1368
1c05b4bc 1369static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1da177e4 1370{
1c05b4bc
N
1371 __le32 disk_csum;
1372 u32 csum;
1da177e4
LT
1373 unsigned long long newcsum;
1374 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1c05b4bc 1375 __le32 *isuper = (__le32*)sb;
1da177e4
LT
1376
1377 disk_csum = sb->sb_csum;
1378 sb->sb_csum = 0;
1379 newcsum = 0;
1f3c9907 1380 for (; size >= 4; size -= 4)
1da177e4
LT
1381 newcsum += le32_to_cpu(*isuper++);
1382
1383 if (size == 2)
1c05b4bc 1384 newcsum += le16_to_cpu(*(__le16*) isuper);
1da177e4
LT
1385
1386 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1387 sb->sb_csum = disk_csum;
1388 return cpu_to_le32(csum);
1389}
1390
2699b672
N
1391static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
1392 int acknowledged);
3cb03002 1393static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1da177e4
LT
1394{
1395 struct mdp_superblock_1 *sb;
1396 int ret;
0f420358 1397 sector_t sb_start;
c6563a8c 1398 sector_t sectors;
1da177e4 1399 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 1400 int bmask;
1da177e4
LT
1401
1402 /*
0f420358 1403 * Calculate the position of the superblock in 512byte sectors.
1da177e4
LT
1404 * It is always aligned to a 4K boundary and
1405 * depeding on minor_version, it can be:
1406 * 0: At least 8K, but less than 12K, from end of device
1407 * 1: At start of device
1408 * 2: 4K from start of device.
1409 */
1410 switch(minor_version) {
1411 case 0:
77304d2a 1412 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
0f420358
AN
1413 sb_start -= 8*2;
1414 sb_start &= ~(sector_t)(4*2-1);
1da177e4
LT
1415 break;
1416 case 1:
0f420358 1417 sb_start = 0;
1da177e4
LT
1418 break;
1419 case 2:
0f420358 1420 sb_start = 8;
1da177e4
LT
1421 break;
1422 default:
1423 return -EINVAL;
1424 }
0f420358 1425 rdev->sb_start = sb_start;
1da177e4 1426
0002b271
N
1427 /* superblock is rarely larger than 1K, but it can be larger,
1428 * and it is safe to read 4k, so we do that
1429 */
1430 ret = read_disk_sb(rdev, 4096);
1da177e4
LT
1431 if (ret) return ret;
1432
1433
65a06f06 1434 sb = page_address(rdev->sb_page);
1da177e4
LT
1435
1436 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1437 sb->major_version != cpu_to_le32(1) ||
1438 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
0f420358 1439 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
71c0805c 1440 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT
1441 return -EINVAL;
1442
1443 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1444 printk("md: invalid superblock checksum on %s\n",
1445 bdevname(rdev->bdev,b));
1446 return -EINVAL;
1447 }
1448 if (le64_to_cpu(sb->data_size) < 10) {
1449 printk("md: data_size too small on %s\n",
1450 bdevname(rdev->bdev,b));
1451 return -EINVAL;
1452 }
c6563a8c
N
1453 if (sb->pad0 ||
1454 sb->pad3[0] ||
1455 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1456 /* Some padding is non-zero, might be a new feature */
1457 return -EINVAL;
e11e93fa 1458
1da177e4
LT
1459 rdev->preferred_minor = 0xffff;
1460 rdev->data_offset = le64_to_cpu(sb->data_offset);
c6563a8c
N
1461 rdev->new_data_offset = rdev->data_offset;
1462 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1463 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1464 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
4dbcdc75 1465 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1da177e4 1466
0002b271 1467 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
e1defc4f 1468 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
0002b271 1469 if (rdev->sb_size & bmask)
a1801f85
N
1470 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1471
1472 if (minor_version
0f420358 1473 && rdev->data_offset < sb_start + (rdev->sb_size/512))
a1801f85 1474 return -EINVAL;
c6563a8c
N
1475 if (minor_version
1476 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1477 return -EINVAL;
0002b271 1478
31b65a0d
N
1479 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1480 rdev->desc_nr = -1;
1481 else
1482 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1483
2699b672
N
1484 if (!rdev->bb_page) {
1485 rdev->bb_page = alloc_page(GFP_KERNEL);
1486 if (!rdev->bb_page)
1487 return -ENOMEM;
1488 }
1489 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1490 rdev->badblocks.count == 0) {
1491 /* need to load the bad block list.
1492 * Currently we limit it to one page.
1493 */
1494 s32 offset;
1495 sector_t bb_sector;
1496 u64 *bbp;
1497 int i;
1498 int sectors = le16_to_cpu(sb->bblog_size);
1499 if (sectors > (PAGE_SIZE / 512))
1500 return -EINVAL;
1501 offset = le32_to_cpu(sb->bblog_offset);
1502 if (offset == 0)
1503 return -EINVAL;
1504 bb_sector = (long long)offset;
1505 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1506 rdev->bb_page, READ, true))
1507 return -EIO;
1508 bbp = (u64 *)page_address(rdev->bb_page);
1509 rdev->badblocks.shift = sb->bblog_shift;
1510 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1511 u64 bb = le64_to_cpu(*bbp);
1512 int count = bb & (0x3ff);
1513 u64 sector = bb >> 10;
1514 sector <<= sb->bblog_shift;
1515 count <<= sb->bblog_shift;
1516 if (bb + 1 == 0)
1517 break;
1518 if (md_set_badblocks(&rdev->badblocks,
1519 sector, count, 1) == 0)
1520 return -EINVAL;
1521 }
486adf72
N
1522 } else if (sb->bblog_offset != 0)
1523 rdev->badblocks.shift = 0;
2699b672 1524
9a7b2b0f 1525 if (!refdev) {
8ed75463 1526 ret = 1;
9a7b2b0f 1527 } else {
1da177e4 1528 __u64 ev1, ev2;
65a06f06 1529 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1da177e4
LT
1530
1531 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1532 sb->level != refsb->level ||
1533 sb->layout != refsb->layout ||
1534 sb->chunksize != refsb->chunksize) {
1535 printk(KERN_WARNING "md: %s has strangely different"
1536 " superblock to %s\n",
1537 bdevname(rdev->bdev,b),
1538 bdevname(refdev->bdev,b2));
1539 return -EINVAL;
1540 }
1541 ev1 = le64_to_cpu(sb->events);
1542 ev2 = le64_to_cpu(refsb->events);
1543
1544 if (ev1 > ev2)
8ed75463
N
1545 ret = 1;
1546 else
1547 ret = 0;
1da177e4 1548 }
c6563a8c
N
1549 if (minor_version) {
1550 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1551 sectors -= rdev->data_offset;
1552 } else
1553 sectors = rdev->sb_start;
1554 if (sectors < le64_to_cpu(sb->data_size))
1da177e4 1555 return -EINVAL;
dd8ac336 1556 rdev->sectors = le64_to_cpu(sb->data_size);
8ed75463 1557 return ret;
1da177e4
LT
1558}
1559
fd01b88c 1560static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1da177e4 1561{
65a06f06 1562 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
07d84d10 1563 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4 1564
41158c7e 1565 rdev->raid_disk = -1;
c5d79adb
N
1566 clear_bit(Faulty, &rdev->flags);
1567 clear_bit(In_sync, &rdev->flags);
8313b8e5 1568 clear_bit(Bitmap_sync, &rdev->flags);
c5d79adb 1569 clear_bit(WriteMostly, &rdev->flags);
c5d79adb 1570
1da177e4
LT
1571 if (mddev->raid_disks == 0) {
1572 mddev->major_version = 1;
1573 mddev->patch_version = 0;
e691063a 1574 mddev->external = 0;
9d8f0363 1575 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1da177e4
LT
1576 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1577 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1578 mddev->level = le32_to_cpu(sb->level);
d9d166c2 1579 mddev->clevel[0] = 0;
1da177e4
LT
1580 mddev->layout = le32_to_cpu(sb->layout);
1581 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
58c0fed4 1582 mddev->dev_sectors = le64_to_cpu(sb->size);
07d84d10 1583 mddev->events = ev1;
c3d9714e 1584 mddev->bitmap_info.offset = 0;
6409bb05
N
1585 mddev->bitmap_info.space = 0;
1586 /* Default location for bitmap is 1K after superblock
1587 * using 3K - total of 4K
1588 */
c3d9714e 1589 mddev->bitmap_info.default_offset = 1024 >> 9;
6409bb05 1590 mddev->bitmap_info.default_space = (4096-1024) >> 9;
2c810cdd
N
1591 mddev->reshape_backwards = 0;
1592
1da177e4
LT
1593 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1594 memcpy(mddev->uuid, sb->set_uuid, 16);
1595
1596 mddev->max_disks = (4096-256)/2;
a654b9d8 1597
71c0805c 1598 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
6409bb05 1599 mddev->bitmap_info.file == NULL) {
c3d9714e
N
1600 mddev->bitmap_info.offset =
1601 (__s32)le32_to_cpu(sb->bitmap_offset);
6409bb05
N
1602 /* Metadata doesn't record how much space is available.
1603 * For 1.0, we assume we can use up to the superblock
1604 * if before, else to 4K beyond superblock.
1605 * For others, assume no change is possible.
1606 */
1607 if (mddev->minor_version > 0)
1608 mddev->bitmap_info.space = 0;
1609 else if (mddev->bitmap_info.offset > 0)
1610 mddev->bitmap_info.space =
1611 8 - mddev->bitmap_info.offset;
1612 else
1613 mddev->bitmap_info.space =
1614 -mddev->bitmap_info.offset;
1615 }
e11e93fa 1616
f6705578
N
1617 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1618 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1619 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1620 mddev->new_level = le32_to_cpu(sb->new_level);
1621 mddev->new_layout = le32_to_cpu(sb->new_layout);
664e7c41 1622 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
2c810cdd
N
1623 if (mddev->delta_disks < 0 ||
1624 (mddev->delta_disks == 0 &&
1625 (le32_to_cpu(sb->feature_map)
1626 & MD_FEATURE_RESHAPE_BACKWARDS)))
1627 mddev->reshape_backwards = 1;
f6705578
N
1628 } else {
1629 mddev->reshape_position = MaxSector;
1630 mddev->delta_disks = 0;
1631 mddev->new_level = mddev->level;
1632 mddev->new_layout = mddev->layout;
664e7c41 1633 mddev->new_chunk_sectors = mddev->chunk_sectors;
f6705578
N
1634 }
1635
41158c7e 1636 } else if (mddev->pers == NULL) {
be6800a7
N
1637 /* Insist of good event counter while assembling, except for
1638 * spares (which don't need an event count) */
1da177e4 1639 ++ev1;
be6800a7
N
1640 if (rdev->desc_nr >= 0 &&
1641 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1642 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1643 if (ev1 < mddev->events)
1644 return -EINVAL;
41158c7e
N
1645 } else if (mddev->bitmap) {
1646 /* If adding to array with a bitmap, then we can accept an
1647 * older device, but not too old.
1648 */
41158c7e
N
1649 if (ev1 < mddev->bitmap->events_cleared)
1650 return 0;
8313b8e5
N
1651 if (ev1 < mddev->events)
1652 set_bit(Bitmap_sync, &rdev->flags);
07d84d10
N
1653 } else {
1654 if (ev1 < mddev->events)
1655 /* just a hot-add of a new device, leave raid_disk at -1 */
1656 return 0;
1657 }
1da177e4
LT
1658 if (mddev->level != LEVEL_MULTIPATH) {
1659 int role;
3673f305
N
1660 if (rdev->desc_nr < 0 ||
1661 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1662 role = 0xffff;
1663 rdev->desc_nr = -1;
1664 } else
1665 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1da177e4
LT
1666 switch(role) {
1667 case 0xffff: /* spare */
1da177e4
LT
1668 break;
1669 case 0xfffe: /* faulty */
b2d444d7 1670 set_bit(Faulty, &rdev->flags);
1da177e4
LT
1671 break;
1672 default:
f466722c 1673 rdev->saved_raid_disk = role;
5fd6c1dc 1674 if ((le32_to_cpu(sb->feature_map) &
f466722c 1675 MD_FEATURE_RECOVERY_OFFSET)) {
5fd6c1dc 1676 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
f466722c
N
1677 if (!(le32_to_cpu(sb->feature_map) &
1678 MD_FEATURE_RECOVERY_BITMAP))
1679 rdev->saved_raid_disk = -1;
1680 } else
5fd6c1dc 1681 set_bit(In_sync, &rdev->flags);
1da177e4
LT
1682 rdev->raid_disk = role;
1683 break;
1684 }
8ddf9efe
N
1685 if (sb->devflags & WriteMostly1)
1686 set_bit(WriteMostly, &rdev->flags);
2d78f8c4
N
1687 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1688 set_bit(Replacement, &rdev->flags);
41158c7e 1689 } else /* MULTIPATH are always insync */
b2d444d7 1690 set_bit(In_sync, &rdev->flags);
41158c7e 1691
1da177e4
LT
1692 return 0;
1693}
1694
fd01b88c 1695static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1da177e4
LT
1696{
1697 struct mdp_superblock_1 *sb;
3cb03002 1698 struct md_rdev *rdev2;
1da177e4
LT
1699 int max_dev, i;
1700 /* make rdev->sb match mddev and rdev data. */
1701
65a06f06 1702 sb = page_address(rdev->sb_page);
1da177e4
LT
1703
1704 sb->feature_map = 0;
1705 sb->pad0 = 0;
5fd6c1dc 1706 sb->recovery_offset = cpu_to_le64(0);
1da177e4
LT
1707 memset(sb->pad3, 0, sizeof(sb->pad3));
1708
1709 sb->utime = cpu_to_le64((__u64)mddev->utime);
1710 sb->events = cpu_to_le64(mddev->events);
1711 if (mddev->in_sync)
1712 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1713 else
1714 sb->resync_offset = cpu_to_le64(0);
1715
1c05b4bc 1716 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
4dbcdc75 1717
f0ca340c 1718 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
58c0fed4 1719 sb->size = cpu_to_le64(mddev->dev_sectors);
9d8f0363 1720 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
62e1e389
N
1721 sb->level = cpu_to_le32(mddev->level);
1722 sb->layout = cpu_to_le32(mddev->layout);
f0ca340c 1723
aeb9b211
N
1724 if (test_bit(WriteMostly, &rdev->flags))
1725 sb->devflags |= WriteMostly1;
1726 else
1727 sb->devflags &= ~WriteMostly1;
c6563a8c
N
1728 sb->data_offset = cpu_to_le64(rdev->data_offset);
1729 sb->data_size = cpu_to_le64(rdev->sectors);
aeb9b211 1730
c3d9714e
N
1731 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1732 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
71c0805c 1733 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8 1734 }
5fd6c1dc
N
1735
1736 if (rdev->raid_disk >= 0 &&
97e4f42d 1737 !test_bit(In_sync, &rdev->flags)) {
93be75ff
N
1738 sb->feature_map |=
1739 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1740 sb->recovery_offset =
1741 cpu_to_le64(rdev->recovery_offset);
f466722c
N
1742 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1743 sb->feature_map |=
1744 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
5fd6c1dc 1745 }
2d78f8c4
N
1746 if (test_bit(Replacement, &rdev->flags))
1747 sb->feature_map |=
1748 cpu_to_le32(MD_FEATURE_REPLACEMENT);
5fd6c1dc 1749
f6705578
N
1750 if (mddev->reshape_position != MaxSector) {
1751 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1752 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1753 sb->new_layout = cpu_to_le32(mddev->new_layout);
1754 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1755 sb->new_level = cpu_to_le32(mddev->new_level);
664e7c41 1756 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
2c810cdd
N
1757 if (mddev->delta_disks == 0 &&
1758 mddev->reshape_backwards)
1759 sb->feature_map
1760 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
c6563a8c
N
1761 if (rdev->new_data_offset != rdev->data_offset) {
1762 sb->feature_map
1763 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1764 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1765 - rdev->data_offset));
1766 }
f6705578 1767 }
a654b9d8 1768
2699b672
N
1769 if (rdev->badblocks.count == 0)
1770 /* Nothing to do for bad blocks*/ ;
1771 else if (sb->bblog_offset == 0)
1772 /* Cannot record bad blocks on this device */
1773 md_error(mddev, rdev);
1774 else {
1775 struct badblocks *bb = &rdev->badblocks;
1776 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1777 u64 *p = bb->page;
1778 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1779 if (bb->changed) {
1780 unsigned seq;
1781
1782retry:
1783 seq = read_seqbegin(&bb->lock);
1784
1785 memset(bbp, 0xff, PAGE_SIZE);
1786
1787 for (i = 0 ; i < bb->count ; i++) {
35f9ac2d 1788 u64 internal_bb = p[i];
2699b672
N
1789 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1790 | BB_LEN(internal_bb));
35f9ac2d 1791 bbp[i] = cpu_to_le64(store_bb);
2699b672 1792 }
d0962936 1793 bb->changed = 0;
2699b672
N
1794 if (read_seqretry(&bb->lock, seq))
1795 goto retry;
1796
1797 bb->sector = (rdev->sb_start +
1798 (int)le32_to_cpu(sb->bblog_offset));
1799 bb->size = le16_to_cpu(sb->bblog_size);
2699b672
N
1800 }
1801 }
1802
1da177e4 1803 max_dev = 0;
dafb20fa 1804 rdev_for_each(rdev2, mddev)
1da177e4
LT
1805 if (rdev2->desc_nr+1 > max_dev)
1806 max_dev = rdev2->desc_nr+1;
a778b73f 1807
70471daf
N
1808 if (max_dev > le32_to_cpu(sb->max_dev)) {
1809 int bmask;
a778b73f 1810 sb->max_dev = cpu_to_le32(max_dev);
70471daf
N
1811 rdev->sb_size = max_dev * 2 + 256;
1812 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1813 if (rdev->sb_size & bmask)
1814 rdev->sb_size = (rdev->sb_size | bmask) + 1;
ddcf3522
N
1815 } else
1816 max_dev = le32_to_cpu(sb->max_dev);
1817
1da177e4
LT
1818 for (i=0; i<max_dev;i++)
1819 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1820
dafb20fa 1821 rdev_for_each(rdev2, mddev) {
1da177e4 1822 i = rdev2->desc_nr;
b2d444d7 1823 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1824 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1825 else if (test_bit(In_sync, &rdev2->flags))
1da177e4 1826 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
93be75ff 1827 else if (rdev2->raid_disk >= 0)
5fd6c1dc 1828 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1da177e4
LT
1829 else
1830 sb->dev_roles[i] = cpu_to_le16(0xffff);
1831 }
1832
1da177e4
LT
1833 sb->sb_csum = calc_sb_1_csum(sb);
1834}
1835
0cd17fec 1836static unsigned long long
3cb03002 1837super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
0cd17fec
CW
1838{
1839 struct mdp_superblock_1 *sb;
15f4a5fd 1840 sector_t max_sectors;
58c0fed4 1841 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
0cd17fec 1842 return 0; /* component must fit device */
c6563a8c
N
1843 if (rdev->data_offset != rdev->new_data_offset)
1844 return 0; /* too confusing */
0f420358 1845 if (rdev->sb_start < rdev->data_offset) {
0cd17fec 1846 /* minor versions 1 and 2; superblock before data */
77304d2a 1847 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
15f4a5fd
AN
1848 max_sectors -= rdev->data_offset;
1849 if (!num_sectors || num_sectors > max_sectors)
1850 num_sectors = max_sectors;
c3d9714e 1851 } else if (rdev->mddev->bitmap_info.offset) {
0cd17fec
CW
1852 /* minor version 0 with bitmap we can't move */
1853 return 0;
1854 } else {
1855 /* minor version 0; superblock after data */
0f420358 1856 sector_t sb_start;
77304d2a 1857 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
0f420358 1858 sb_start &= ~(sector_t)(4*2 - 1);
dd8ac336 1859 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
15f4a5fd
AN
1860 if (!num_sectors || num_sectors > max_sectors)
1861 num_sectors = max_sectors;
0f420358 1862 rdev->sb_start = sb_start;
0cd17fec 1863 }
65a06f06 1864 sb = page_address(rdev->sb_page);
15f4a5fd 1865 sb->data_size = cpu_to_le64(num_sectors);
0f420358 1866 sb->super_offset = rdev->sb_start;
0cd17fec 1867 sb->sb_csum = calc_sb_1_csum(sb);
0f420358 1868 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
0cd17fec
CW
1869 rdev->sb_page);
1870 md_super_wait(rdev->mddev);
c26a44ed 1871 return num_sectors;
c6563a8c
N
1872
1873}
1874
1875static int
1876super_1_allow_new_offset(struct md_rdev *rdev,
1877 unsigned long long new_offset)
1878{
1879 /* All necessary checks on new >= old have been done */
1880 struct bitmap *bitmap;
1881 if (new_offset >= rdev->data_offset)
1882 return 1;
1883
1884 /* with 1.0 metadata, there is no metadata to tread on
1885 * so we can always move back */
1886 if (rdev->mddev->minor_version == 0)
1887 return 1;
1888
1889 /* otherwise we must be sure not to step on
1890 * any metadata, so stay:
1891 * 36K beyond start of superblock
1892 * beyond end of badblocks
1893 * beyond write-intent bitmap
1894 */
1895 if (rdev->sb_start + (32+4)*2 > new_offset)
1896 return 0;
1897 bitmap = rdev->mddev->bitmap;
1898 if (bitmap && !rdev->mddev->bitmap_info.file &&
1899 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1ec885cd 1900 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
c6563a8c
N
1901 return 0;
1902 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
1903 return 0;
1904
1905 return 1;
0cd17fec 1906}
1da177e4 1907
75c96f85 1908static struct super_type super_types[] = {
1da177e4
LT
1909 [0] = {
1910 .name = "0.90.0",
1911 .owner = THIS_MODULE,
0cd17fec
CW
1912 .load_super = super_90_load,
1913 .validate_super = super_90_validate,
1914 .sync_super = super_90_sync,
1915 .rdev_size_change = super_90_rdev_size_change,
c6563a8c 1916 .allow_new_offset = super_90_allow_new_offset,
1da177e4
LT
1917 },
1918 [1] = {
1919 .name = "md-1",
1920 .owner = THIS_MODULE,
0cd17fec
CW
1921 .load_super = super_1_load,
1922 .validate_super = super_1_validate,
1923 .sync_super = super_1_sync,
1924 .rdev_size_change = super_1_rdev_size_change,
c6563a8c 1925 .allow_new_offset = super_1_allow_new_offset,
1da177e4
LT
1926 },
1927};
1da177e4 1928
fd01b88c 1929static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
076f968b
JB
1930{
1931 if (mddev->sync_super) {
1932 mddev->sync_super(mddev, rdev);
1933 return;
1934 }
1935
1936 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1937
1938 super_types[mddev->major_version].sync_super(mddev, rdev);
1939}
1940
fd01b88c 1941static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1da177e4 1942{
3cb03002 1943 struct md_rdev *rdev, *rdev2;
1da177e4 1944
4b80991c
N
1945 rcu_read_lock();
1946 rdev_for_each_rcu(rdev, mddev1)
1947 rdev_for_each_rcu(rdev2, mddev2)
7dd5e7c3 1948 if (rdev->bdev->bd_contains ==
4b80991c
N
1949 rdev2->bdev->bd_contains) {
1950 rcu_read_unlock();
7dd5e7c3 1951 return 1;
4b80991c
N
1952 }
1953 rcu_read_unlock();
1da177e4
LT
1954 return 0;
1955}
1956
1957static LIST_HEAD(pending_raid_disks);
1958
ac5e7113
AN
1959/*
1960 * Try to register data integrity profile for an mddev
1961 *
1962 * This is called when an array is started and after a disk has been kicked
1963 * from the array. It only succeeds if all working and active component devices
1964 * are integrity capable with matching profiles.
1965 */
fd01b88c 1966int md_integrity_register(struct mddev *mddev)
ac5e7113 1967{
3cb03002 1968 struct md_rdev *rdev, *reference = NULL;
ac5e7113
AN
1969
1970 if (list_empty(&mddev->disks))
1971 return 0; /* nothing to do */
629acb6a
JB
1972 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
1973 return 0; /* shouldn't register, or already is */
dafb20fa 1974 rdev_for_each(rdev, mddev) {
ac5e7113
AN
1975 /* skip spares and non-functional disks */
1976 if (test_bit(Faulty, &rdev->flags))
1977 continue;
1978 if (rdev->raid_disk < 0)
1979 continue;
ac5e7113
AN
1980 if (!reference) {
1981 /* Use the first rdev as the reference */
1982 reference = rdev;
1983 continue;
1984 }
1985 /* does this rdev's profile match the reference profile? */
1986 if (blk_integrity_compare(reference->bdev->bd_disk,
1987 rdev->bdev->bd_disk) < 0)
1988 return -EINVAL;
1989 }
89078d57
MP
1990 if (!reference || !bdev_get_integrity(reference->bdev))
1991 return 0;
ac5e7113
AN
1992 /*
1993 * All component devices are integrity capable and have matching
1994 * profiles, register the common profile for the md device.
1995 */
1996 if (blk_integrity_register(mddev->gendisk,
1997 bdev_get_integrity(reference->bdev)) != 0) {
1998 printk(KERN_ERR "md: failed to register integrity for %s\n",
1999 mdname(mddev));
2000 return -EINVAL;
2001 }
a91a2785
MP
2002 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
2003 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
2004 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
2005 mdname(mddev));
2006 return -EINVAL;
2007 }
ac5e7113
AN
2008 return 0;
2009}
2010EXPORT_SYMBOL(md_integrity_register);
2011
2012/* Disable data integrity if non-capable/non-matching disk is being added */
fd01b88c 2013void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
3f9d99c1 2014{
2863b9eb
JB
2015 struct blk_integrity *bi_rdev;
2016 struct blk_integrity *bi_mddev;
2017
2018 if (!mddev->gendisk)
2019 return;
2020
2021 bi_rdev = bdev_get_integrity(rdev->bdev);
2022 bi_mddev = blk_get_integrity(mddev->gendisk);
3f9d99c1 2023
ac5e7113 2024 if (!bi_mddev) /* nothing to do */
3f9d99c1 2025 return;
ac5e7113 2026 if (rdev->raid_disk < 0) /* skip spares */
3f9d99c1 2027 return;
ac5e7113
AN
2028 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
2029 rdev->bdev->bd_disk) >= 0)
2030 return;
2031 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
2032 blk_integrity_unregister(mddev->gendisk);
3f9d99c1 2033}
ac5e7113 2034EXPORT_SYMBOL(md_integrity_add_rdev);
3f9d99c1 2035
fd01b88c 2036static int bind_rdev_to_array(struct md_rdev * rdev, struct mddev * mddev)
1da177e4 2037{
7dd5e7c3 2038 char b[BDEVNAME_SIZE];
f637b9f9 2039 struct kobject *ko;
1edf80d3 2040 char *s;
5e55e2f5 2041 int err;
1da177e4
LT
2042
2043 if (rdev->mddev) {
2044 MD_BUG();
2045 return -EINVAL;
2046 }
11e2ede0
DW
2047
2048 /* prevent duplicates */
2049 if (find_rdev(mddev, rdev->bdev->bd_dev))
2050 return -EEXIST;
2051
dd8ac336
AN
2052 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2053 if (rdev->sectors && (mddev->dev_sectors == 0 ||
2054 rdev->sectors < mddev->dev_sectors)) {
a778b73f
N
2055 if (mddev->pers) {
2056 /* Cannot change size, so fail
2057 * If mddev->level <= 0, then we don't care
2058 * about aligning sizes (e.g. linear)
2059 */
2060 if (mddev->level > 0)
2061 return -ENOSPC;
2062 } else
dd8ac336 2063 mddev->dev_sectors = rdev->sectors;
2bf071bf 2064 }
1da177e4
LT
2065
2066 /* Verify rdev->desc_nr is unique.
2067 * If it is -1, assign a free number, else
2068 * check number is not in use
2069 */
2070 if (rdev->desc_nr < 0) {
2071 int choice = 0;
2072 if (mddev->pers) choice = mddev->raid_disks;
2073 while (find_rdev_nr(mddev, choice))
2074 choice++;
2075 rdev->desc_nr = choice;
2076 } else {
2077 if (find_rdev_nr(mddev, rdev->desc_nr))
2078 return -EBUSY;
2079 }
de01dfad
N
2080 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2081 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
2082 mdname(mddev), mddev->max_disks);
2083 return -EBUSY;
2084 }
19133a42 2085 bdevname(rdev->bdev,b);
649316b2 2086 while ( (s=strchr(b, '/')) != NULL)
1edf80d3 2087 *s = '!';
649316b2 2088
1da177e4 2089 rdev->mddev = mddev;
19133a42 2090 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 2091
b2d6db58 2092 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
5e55e2f5 2093 goto fail;
86e6ffdd 2094
0762b8bd 2095 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
00bcb4ac
N
2096 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2097 /* failure here is OK */;
2098 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
3c0ee63a 2099
4b80991c 2100 list_add_rcu(&rdev->same_set, &mddev->disks);
e09b457b 2101 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
4044ba58
N
2102
2103 /* May as well allow recovery to be retried once */
5389042f 2104 mddev->recovery_disabled++;
3f9d99c1 2105
1da177e4 2106 return 0;
5e55e2f5
N
2107
2108 fail:
2109 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
2110 b, mdname(mddev));
2111 return err;
1da177e4
LT
2112}
2113
177a99b2 2114static void md_delayed_delete(struct work_struct *ws)
5792a285 2115{
3cb03002 2116 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
5792a285 2117 kobject_del(&rdev->kobj);
177a99b2 2118 kobject_put(&rdev->kobj);
5792a285
N
2119}
2120
3cb03002 2121static void unbind_rdev_from_array(struct md_rdev * rdev)
1da177e4
LT
2122{
2123 char b[BDEVNAME_SIZE];
2124 if (!rdev->mddev) {
2125 MD_BUG();
2126 return;
2127 }
49731baa 2128 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
4b80991c 2129 list_del_rcu(&rdev->same_set);
1da177e4
LT
2130 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
2131 rdev->mddev = NULL;
86e6ffdd 2132 sysfs_remove_link(&rdev->kobj, "block");
3c0ee63a
N
2133 sysfs_put(rdev->sysfs_state);
2134 rdev->sysfs_state = NULL;
2230dfe4 2135 rdev->badblocks.count = 0;
5792a285 2136 /* We need to delay this, otherwise we can deadlock when
4b80991c
N
2137 * writing to 'remove' to "dev/state". We also need
2138 * to delay it due to rcu usage.
5792a285 2139 */
4b80991c 2140 synchronize_rcu();
177a99b2
N
2141 INIT_WORK(&rdev->del_work, md_delayed_delete);
2142 kobject_get(&rdev->kobj);
e804ac78 2143 queue_work(md_misc_wq, &rdev->del_work);
1da177e4
LT
2144}
2145
2146/*
2147 * prevent the device from being mounted, repartitioned or
2148 * otherwise reused by a RAID array (or any other kernel
2149 * subsystem), by bd_claiming the device.
2150 */
3cb03002 2151static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
1da177e4
LT
2152{
2153 int err = 0;
2154 struct block_device *bdev;
2155 char b[BDEVNAME_SIZE];
2156
d4d77629 2157 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
3cb03002 2158 shared ? (struct md_rdev *)lock_rdev : rdev);
1da177e4
LT
2159 if (IS_ERR(bdev)) {
2160 printk(KERN_ERR "md: could not open %s.\n",
2161 __bdevname(dev, b));
2162 return PTR_ERR(bdev);
2163 }
1da177e4
LT
2164 rdev->bdev = bdev;
2165 return err;
2166}
2167
3cb03002 2168static void unlock_rdev(struct md_rdev *rdev)
1da177e4
LT
2169{
2170 struct block_device *bdev = rdev->bdev;
2171 rdev->bdev = NULL;
2172 if (!bdev)
2173 MD_BUG();
e525fd89 2174 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
1da177e4
LT
2175}
2176
2177void md_autodetect_dev(dev_t dev);
2178
3cb03002 2179static void export_rdev(struct md_rdev * rdev)
1da177e4
LT
2180{
2181 char b[BDEVNAME_SIZE];
2182 printk(KERN_INFO "md: export_rdev(%s)\n",
2183 bdevname(rdev->bdev,b));
2184 if (rdev->mddev)
2185 MD_BUG();
545c8795 2186 md_rdev_clear(rdev);
1da177e4 2187#ifndef MODULE
d0fae18f
N
2188 if (test_bit(AutoDetected, &rdev->flags))
2189 md_autodetect_dev(rdev->bdev->bd_dev);
1da177e4
LT
2190#endif
2191 unlock_rdev(rdev);
86e6ffdd 2192 kobject_put(&rdev->kobj);
1da177e4
LT
2193}
2194
3cb03002 2195static void kick_rdev_from_array(struct md_rdev * rdev)
1da177e4
LT
2196{
2197 unbind_rdev_from_array(rdev);
2198 export_rdev(rdev);
2199}
2200
fd01b88c 2201static void export_array(struct mddev *mddev)
1da177e4 2202{
3cb03002 2203 struct md_rdev *rdev, *tmp;
1da177e4 2204
dafb20fa 2205 rdev_for_each_safe(rdev, tmp, mddev) {
1da177e4
LT
2206 if (!rdev->mddev) {
2207 MD_BUG();
2208 continue;
2209 }
2210 kick_rdev_from_array(rdev);
2211 }
2212 if (!list_empty(&mddev->disks))
2213 MD_BUG();
2214 mddev->raid_disks = 0;
2215 mddev->major_version = 0;
2216}
2217
2218static void print_desc(mdp_disk_t *desc)
2219{
2220 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
2221 desc->major,desc->minor,desc->raid_disk,desc->state);
2222}
2223
cd2ac932 2224static void print_sb_90(mdp_super_t *sb)
1da177e4
LT
2225{
2226 int i;
2227
2228 printk(KERN_INFO
2229 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2230 sb->major_version, sb->minor_version, sb->patch_version,
2231 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
2232 sb->ctime);
2233 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2234 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
2235 sb->md_minor, sb->layout, sb->chunk_size);
2236 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
2237 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2238 sb->utime, sb->state, sb->active_disks, sb->working_disks,
2239 sb->failed_disks, sb->spare_disks,
2240 sb->sb_csum, (unsigned long)sb->events_lo);
2241
2242 printk(KERN_INFO);
2243 for (i = 0; i < MD_SB_DISKS; i++) {
2244 mdp_disk_t *desc;
2245
2246 desc = sb->disks + i;
2247 if (desc->number || desc->major || desc->minor ||
2248 desc->raid_disk || (desc->state && (desc->state != 4))) {
2249 printk(" D %2d: ", i);
2250 print_desc(desc);
2251 }
2252 }
2253 printk(KERN_INFO "md: THIS: ");
2254 print_desc(&sb->this_disk);
cd2ac932 2255}
1da177e4 2256
cd2ac932
CR
2257static void print_sb_1(struct mdp_superblock_1 *sb)
2258{
2259 __u8 *uuid;
2260
2261 uuid = sb->set_uuid;
ad361c98 2262 printk(KERN_INFO
7b75c2f8 2263 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
ad361c98 2264 "md: Name: \"%s\" CT:%llu\n",
cd2ac932
CR
2265 le32_to_cpu(sb->major_version),
2266 le32_to_cpu(sb->feature_map),
7b75c2f8 2267 uuid,
cd2ac932
CR
2268 sb->set_name,
2269 (unsigned long long)le64_to_cpu(sb->ctime)
2270 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
2271
2272 uuid = sb->device_uuid;
ad361c98
JP
2273 printk(KERN_INFO
2274 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
cd2ac932 2275 " RO:%llu\n"
7b75c2f8 2276 "md: Dev:%08x UUID: %pU\n"
ad361c98
JP
2277 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2278 "md: (MaxDev:%u) \n",
cd2ac932
CR
2279 le32_to_cpu(sb->level),
2280 (unsigned long long)le64_to_cpu(sb->size),
2281 le32_to_cpu(sb->raid_disks),
2282 le32_to_cpu(sb->layout),
2283 le32_to_cpu(sb->chunksize),
2284 (unsigned long long)le64_to_cpu(sb->data_offset),
2285 (unsigned long long)le64_to_cpu(sb->data_size),
2286 (unsigned long long)le64_to_cpu(sb->super_offset),
2287 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2288 le32_to_cpu(sb->dev_number),
7b75c2f8 2289 uuid,
cd2ac932
CR
2290 sb->devflags,
2291 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2292 (unsigned long long)le64_to_cpu(sb->events),
2293 (unsigned long long)le64_to_cpu(sb->resync_offset),
2294 le32_to_cpu(sb->sb_csum),
2295 le32_to_cpu(sb->max_dev)
2296 );
1da177e4
LT
2297}
2298
3cb03002 2299static void print_rdev(struct md_rdev *rdev, int major_version)
1da177e4
LT
2300{
2301 char b[BDEVNAME_SIZE];
dd8ac336
AN
2302 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2303 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
b2d444d7
N
2304 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2305 rdev->desc_nr);
1da177e4 2306 if (rdev->sb_loaded) {
cd2ac932
CR
2307 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2308 switch (major_version) {
2309 case 0:
65a06f06 2310 print_sb_90(page_address(rdev->sb_page));
cd2ac932
CR
2311 break;
2312 case 1:
65a06f06 2313 print_sb_1(page_address(rdev->sb_page));
cd2ac932
CR
2314 break;
2315 }
1da177e4
LT
2316 } else
2317 printk(KERN_INFO "md: no rdev superblock!\n");
2318}
2319
5e56341d 2320static void md_print_devices(void)
1da177e4 2321{
159ec1fc 2322 struct list_head *tmp;
3cb03002 2323 struct md_rdev *rdev;
fd01b88c 2324 struct mddev *mddev;
1da177e4
LT
2325 char b[BDEVNAME_SIZE];
2326
2327 printk("\n");
2328 printk("md: **********************************\n");
2329 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2330 printk("md: **********************************\n");
29ac4aa3 2331 for_each_mddev(mddev, tmp) {
1da177e4 2332
32a7627c
N
2333 if (mddev->bitmap)
2334 bitmap_print_sb(mddev->bitmap);
2335 else
2336 printk("%s: ", mdname(mddev));
dafb20fa 2337 rdev_for_each(rdev, mddev)
1da177e4
LT
2338 printk("<%s>", bdevname(rdev->bdev,b));
2339 printk("\n");
2340
dafb20fa 2341 rdev_for_each(rdev, mddev)
cd2ac932 2342 print_rdev(rdev, mddev->major_version);
1da177e4
LT
2343 }
2344 printk("md: **********************************\n");
2345 printk("\n");
2346}
2347
2348
fd01b88c 2349static void sync_sbs(struct mddev * mddev, int nospares)
1da177e4 2350{
42543769
N
2351 /* Update each superblock (in-memory image), but
2352 * if we are allowed to, skip spares which already
2353 * have the right event counter, or have one earlier
2354 * (which would mean they aren't being marked as dirty
2355 * with the rest of the array)
2356 */
3cb03002 2357 struct md_rdev *rdev;
dafb20fa 2358 rdev_for_each(rdev, mddev) {
42543769
N
2359 if (rdev->sb_events == mddev->events ||
2360 (nospares &&
2361 rdev->raid_disk < 0 &&
42543769
N
2362 rdev->sb_events+1 == mddev->events)) {
2363 /* Don't update this superblock */
2364 rdev->sb_loaded = 2;
2365 } else {
076f968b 2366 sync_super(mddev, rdev);
42543769
N
2367 rdev->sb_loaded = 1;
2368 }
1da177e4
LT
2369 }
2370}
2371
fd01b88c 2372static void md_update_sb(struct mddev * mddev, int force_change)
1da177e4 2373{
3cb03002 2374 struct md_rdev *rdev;
06d91a5f 2375 int sync_req;
42543769 2376 int nospares = 0;
2699b672 2377 int any_badblocks_changed = 0;
1da177e4 2378
d87f064f
N
2379 if (mddev->ro) {
2380 if (force_change)
2381 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2382 return;
2383 }
1da177e4 2384repeat:
3a3a5ddb 2385 /* First make sure individual recovery_offsets are correct */
dafb20fa 2386 rdev_for_each(rdev, mddev) {
3a3a5ddb
N
2387 if (rdev->raid_disk >= 0 &&
2388 mddev->delta_disks >= 0 &&
2389 !test_bit(In_sync, &rdev->flags) &&
2390 mddev->curr_resync_completed > rdev->recovery_offset)
2391 rdev->recovery_offset = mddev->curr_resync_completed;
2392
2393 }
bd52b746 2394 if (!mddev->persistent) {
070dc6dd 2395 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
3a3a5ddb 2396 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
de393cde 2397 if (!mddev->external) {
d97a41dc 2398 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
dafb20fa 2399 rdev_for_each(rdev, mddev) {
de393cde 2400 if (rdev->badblocks.changed) {
d0962936 2401 rdev->badblocks.changed = 0;
de393cde
N
2402 md_ack_all_badblocks(&rdev->badblocks);
2403 md_error(mddev, rdev);
2404 }
2405 clear_bit(Blocked, &rdev->flags);
2406 clear_bit(BlockedBadBlocks, &rdev->flags);
2407 wake_up(&rdev->blocked_wait);
2408 }
2409 }
3a3a5ddb
N
2410 wake_up(&mddev->sb_wait);
2411 return;
2412 }
2413
a9701a30 2414 spin_lock_irq(&mddev->write_lock);
84692195 2415
3a3a5ddb
N
2416 mddev->utime = get_seconds();
2417
850b2b42
N
2418 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2419 force_change = 1;
2420 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2421 /* just a clean<-> dirty transition, possibly leave spares alone,
2422 * though if events isn't the right even/odd, we will have to do
2423 * spares after all
2424 */
2425 nospares = 1;
2426 if (force_change)
2427 nospares = 0;
2428 if (mddev->degraded)
84692195
N
2429 /* If the array is degraded, then skipping spares is both
2430 * dangerous and fairly pointless.
2431 * Dangerous because a device that was removed from the array
2432 * might have a event_count that still looks up-to-date,
2433 * so it can be re-added without a resync.
2434 * Pointless because if there are any spares to skip,
2435 * then a recovery will happen and soon that array won't
2436 * be degraded any more and the spare can go back to sleep then.
2437 */
850b2b42 2438 nospares = 0;
84692195 2439
06d91a5f 2440 sync_req = mddev->in_sync;
42543769
N
2441
2442 /* If this is just a dirty<->clean transition, and the array is clean
2443 * and 'events' is odd, we can roll back to the previous clean state */
850b2b42 2444 if (nospares
42543769 2445 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
a8707c08
N
2446 && mddev->can_decrease_events
2447 && mddev->events != 1) {
42543769 2448 mddev->events--;
a8707c08
N
2449 mddev->can_decrease_events = 0;
2450 } else {
42543769
N
2451 /* otherwise we have to go forward and ... */
2452 mddev->events ++;
a8707c08 2453 mddev->can_decrease_events = nospares;
42543769 2454 }
1da177e4
LT
2455
2456 if (!mddev->events) {
2457 /*
2458 * oops, this 64-bit counter should never wrap.
2459 * Either we are in around ~1 trillion A.C., assuming
2460 * 1 reboot per second, or we have a bug:
2461 */
2462 MD_BUG();
2463 mddev->events --;
2464 }
2699b672 2465
dafb20fa 2466 rdev_for_each(rdev, mddev) {
2699b672
N
2467 if (rdev->badblocks.changed)
2468 any_badblocks_changed++;
de393cde
N
2469 if (test_bit(Faulty, &rdev->flags))
2470 set_bit(FaultRecorded, &rdev->flags);
2471 }
2699b672 2472
e691063a 2473 sync_sbs(mddev, nospares);
a9701a30 2474 spin_unlock_irq(&mddev->write_lock);
1da177e4 2475
36a4e1fe
N
2476 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2477 mdname(mddev), mddev->in_sync);
1da177e4 2478
4ad13663 2479 bitmap_update_sb(mddev->bitmap);
dafb20fa 2480 rdev_for_each(rdev, mddev) {
1da177e4 2481 char b[BDEVNAME_SIZE];
36a4e1fe 2482
42543769
N
2483 if (rdev->sb_loaded != 1)
2484 continue; /* no noise on spare devices */
1da177e4 2485
f466722c 2486 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 2487 md_super_write(mddev,rdev,
0f420358 2488 rdev->sb_start, rdev->sb_size,
7bfa19f2 2489 rdev->sb_page);
36a4e1fe
N
2490 pr_debug("md: (write) %s's sb offset: %llu\n",
2491 bdevname(rdev->bdev, b),
2492 (unsigned long long)rdev->sb_start);
42543769 2493 rdev->sb_events = mddev->events;
2699b672
N
2494 if (rdev->badblocks.size) {
2495 md_super_write(mddev, rdev,
2496 rdev->badblocks.sector,
2497 rdev->badblocks.size << 9,
2498 rdev->bb_page);
2499 rdev->badblocks.size = 0;
2500 }
7bfa19f2 2501
f466722c 2502 } else
36a4e1fe
N
2503 pr_debug("md: %s (skipping faulty)\n",
2504 bdevname(rdev->bdev, b));
d70ed2e4 2505
7bfa19f2 2506 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT
2507 /* only need to write one superblock... */
2508 break;
2509 }
a9701a30 2510 md_super_wait(mddev);
850b2b42 2511 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
7bfa19f2 2512
a9701a30 2513 spin_lock_irq(&mddev->write_lock);
850b2b42
N
2514 if (mddev->in_sync != sync_req ||
2515 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
06d91a5f 2516 /* have to write it out again */
a9701a30 2517 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N
2518 goto repeat;
2519 }
850b2b42 2520 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
a9701a30 2521 spin_unlock_irq(&mddev->write_lock);
3d310eb7 2522 wake_up(&mddev->sb_wait);
acb180b0
N
2523 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2524 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
06d91a5f 2525
dafb20fa 2526 rdev_for_each(rdev, mddev) {
de393cde
N
2527 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2528 clear_bit(Blocked, &rdev->flags);
2529
2530 if (any_badblocks_changed)
2699b672 2531 md_ack_all_badblocks(&rdev->badblocks);
de393cde
N
2532 clear_bit(BlockedBadBlocks, &rdev->flags);
2533 wake_up(&rdev->blocked_wait);
2534 }
1da177e4
LT
2535}
2536
7f6ce769 2537/* words written to sysfs files may, or may not, be \n terminated.
bce74dac
N
2538 * We want to accept with case. For this we use cmd_match.
2539 */
2540static int cmd_match(const char *cmd, const char *str)
2541{
2542 /* See if cmd, written into a sysfs file, matches
2543 * str. They must either be the same, or cmd can
2544 * have a trailing newline
2545 */
2546 while (*cmd && *str && *cmd == *str) {
2547 cmd++;
2548 str++;
2549 }
2550 if (*cmd == '\n')
2551 cmd++;
2552 if (*str || *cmd)
2553 return 0;
2554 return 1;
2555}
2556
86e6ffdd
N
2557struct rdev_sysfs_entry {
2558 struct attribute attr;
3cb03002
N
2559 ssize_t (*show)(struct md_rdev *, char *);
2560 ssize_t (*store)(struct md_rdev *, const char *, size_t);
86e6ffdd
N
2561};
2562
2563static ssize_t
3cb03002 2564state_show(struct md_rdev *rdev, char *page)
86e6ffdd
N
2565{
2566 char *sep = "";
20a49ff6 2567 size_t len = 0;
86e6ffdd 2568
de393cde
N
2569 if (test_bit(Faulty, &rdev->flags) ||
2570 rdev->badblocks.unacked_exist) {
86e6ffdd
N
2571 len+= sprintf(page+len, "%sfaulty",sep);
2572 sep = ",";
2573 }
b2d444d7 2574 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N
2575 len += sprintf(page+len, "%sin_sync",sep);
2576 sep = ",";
2577 }
f655675b
N
2578 if (test_bit(WriteMostly, &rdev->flags)) {
2579 len += sprintf(page+len, "%swrite_mostly",sep);
2580 sep = ",";
2581 }
de393cde 2582 if (test_bit(Blocked, &rdev->flags) ||
52c64152
N
2583 (rdev->badblocks.unacked_exist
2584 && !test_bit(Faulty, &rdev->flags))) {
6bfe0b49
DW
2585 len += sprintf(page+len, "%sblocked", sep);
2586 sep = ",";
2587 }
b2d444d7
N
2588 if (!test_bit(Faulty, &rdev->flags) &&
2589 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N
2590 len += sprintf(page+len, "%sspare", sep);
2591 sep = ",";
2592 }
d7a9d443
N
2593 if (test_bit(WriteErrorSeen, &rdev->flags)) {
2594 len += sprintf(page+len, "%swrite_error", sep);
2595 sep = ",";
2596 }
2d78f8c4
N
2597 if (test_bit(WantReplacement, &rdev->flags)) {
2598 len += sprintf(page+len, "%swant_replacement", sep);
2599 sep = ",";
2600 }
2601 if (test_bit(Replacement, &rdev->flags)) {
2602 len += sprintf(page+len, "%sreplacement", sep);
2603 sep = ",";
2604 }
2605
86e6ffdd
N
2606 return len+sprintf(page+len, "\n");
2607}
2608
45dc2de1 2609static ssize_t
3cb03002 2610state_store(struct md_rdev *rdev, const char *buf, size_t len)
45dc2de1
N
2611{
2612 /* can write
de393cde 2613 * faulty - simulates an error
45dc2de1 2614 * remove - disconnects the device
f655675b
N
2615 * writemostly - sets write_mostly
2616 * -writemostly - clears write_mostly
de393cde
N
2617 * blocked - sets the Blocked flags
2618 * -blocked - clears the Blocked and possibly simulates an error
6d56e278 2619 * insync - sets Insync providing device isn't active
f466722c
N
2620 * -insync - clear Insync for a device with a slot assigned,
2621 * so that it gets rebuilt based on bitmap
d7a9d443
N
2622 * write_error - sets WriteErrorSeen
2623 * -write_error - clears WriteErrorSeen
45dc2de1
N
2624 */
2625 int err = -EINVAL;
2626 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2627 md_error(rdev->mddev, rdev);
5ef56c8f
N
2628 if (test_bit(Faulty, &rdev->flags))
2629 err = 0;
2630 else
2631 err = -EBUSY;
45dc2de1
N
2632 } else if (cmd_match(buf, "remove")) {
2633 if (rdev->raid_disk >= 0)
2634 err = -EBUSY;
2635 else {
fd01b88c 2636 struct mddev *mddev = rdev->mddev;
45dc2de1 2637 kick_rdev_from_array(rdev);
3f9d7b0d
N
2638 if (mddev->pers)
2639 md_update_sb(mddev, 1);
45dc2de1
N
2640 md_new_event(mddev);
2641 err = 0;
2642 }
f655675b
N
2643 } else if (cmd_match(buf, "writemostly")) {
2644 set_bit(WriteMostly, &rdev->flags);
2645 err = 0;
2646 } else if (cmd_match(buf, "-writemostly")) {
2647 clear_bit(WriteMostly, &rdev->flags);
6bfe0b49
DW
2648 err = 0;
2649 } else if (cmd_match(buf, "blocked")) {
2650 set_bit(Blocked, &rdev->flags);
2651 err = 0;
2652 } else if (cmd_match(buf, "-blocked")) {
de393cde 2653 if (!test_bit(Faulty, &rdev->flags) &&
7da64a0a 2654 rdev->badblocks.unacked_exist) {
de393cde
N
2655 /* metadata handler doesn't understand badblocks,
2656 * so we need to fail the device
2657 */
2658 md_error(rdev->mddev, rdev);
2659 }
6bfe0b49 2660 clear_bit(Blocked, &rdev->flags);
de393cde 2661 clear_bit(BlockedBadBlocks, &rdev->flags);
6bfe0b49
DW
2662 wake_up(&rdev->blocked_wait);
2663 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2664 md_wakeup_thread(rdev->mddev->thread);
2665
6d56e278
N
2666 err = 0;
2667 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2668 set_bit(In_sync, &rdev->flags);
f655675b 2669 err = 0;
f466722c
N
2670 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0) {
2671 clear_bit(In_sync, &rdev->flags);
2672 rdev->saved_raid_disk = rdev->raid_disk;
2673 rdev->raid_disk = -1;
2674 err = 0;
d7a9d443
N
2675 } else if (cmd_match(buf, "write_error")) {
2676 set_bit(WriteErrorSeen, &rdev->flags);
2677 err = 0;
2678 } else if (cmd_match(buf, "-write_error")) {
2679 clear_bit(WriteErrorSeen, &rdev->flags);
2680 err = 0;
2d78f8c4
N
2681 } else if (cmd_match(buf, "want_replacement")) {
2682 /* Any non-spare device that is not a replacement can
2683 * become want_replacement at any time, but we then need to
2684 * check if recovery is needed.
2685 */
2686 if (rdev->raid_disk >= 0 &&
2687 !test_bit(Replacement, &rdev->flags))
2688 set_bit(WantReplacement, &rdev->flags);
2689 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2690 md_wakeup_thread(rdev->mddev->thread);
2691 err = 0;
2692 } else if (cmd_match(buf, "-want_replacement")) {
2693 /* Clearing 'want_replacement' is always allowed.
2694 * Once replacements starts it is too late though.
2695 */
2696 err = 0;
2697 clear_bit(WantReplacement, &rdev->flags);
2698 } else if (cmd_match(buf, "replacement")) {
2699 /* Can only set a device as a replacement when array has not
2700 * yet been started. Once running, replacement is automatic
2701 * from spares, or by assigning 'slot'.
2702 */
2703 if (rdev->mddev->pers)
2704 err = -EBUSY;
2705 else {
2706 set_bit(Replacement, &rdev->flags);
2707 err = 0;
2708 }
2709 } else if (cmd_match(buf, "-replacement")) {
2710 /* Similarly, can only clear Replacement before start */
2711 if (rdev->mddev->pers)
2712 err = -EBUSY;
2713 else {
2714 clear_bit(Replacement, &rdev->flags);
2715 err = 0;
2716 }
45dc2de1 2717 }
00bcb4ac
N
2718 if (!err)
2719 sysfs_notify_dirent_safe(rdev->sysfs_state);
45dc2de1
N
2720 return err ? err : len;
2721}
80ca3a44
N
2722static struct rdev_sysfs_entry rdev_state =
2723__ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
86e6ffdd 2724
4dbcdc75 2725static ssize_t
3cb03002 2726errors_show(struct md_rdev *rdev, char *page)
4dbcdc75
N
2727{
2728 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2729}
2730
2731static ssize_t
3cb03002 2732errors_store(struct md_rdev *rdev, const char *buf, size_t len)
4dbcdc75
N
2733{
2734 char *e;
2735 unsigned long n = simple_strtoul(buf, &e, 10);
2736 if (*buf && (*e == 0 || *e == '\n')) {
2737 atomic_set(&rdev->corrected_errors, n);
2738 return len;
2739 }
2740 return -EINVAL;
2741}
2742static struct rdev_sysfs_entry rdev_errors =
80ca3a44 2743__ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
4dbcdc75 2744
014236d2 2745static ssize_t
3cb03002 2746slot_show(struct md_rdev *rdev, char *page)
014236d2
N
2747{
2748 if (rdev->raid_disk < 0)
2749 return sprintf(page, "none\n");
2750 else
2751 return sprintf(page, "%d\n", rdev->raid_disk);
2752}
2753
2754static ssize_t
3cb03002 2755slot_store(struct md_rdev *rdev, const char *buf, size_t len)
014236d2
N
2756{
2757 char *e;
c303da6d 2758 int err;
014236d2
N
2759 int slot = simple_strtoul(buf, &e, 10);
2760 if (strncmp(buf, "none", 4)==0)
2761 slot = -1;
2762 else if (e==buf || (*e && *e!= '\n'))
2763 return -EINVAL;
6c2fce2e 2764 if (rdev->mddev->pers && slot == -1) {
c303da6d
N
2765 /* Setting 'slot' on an active array requires also
2766 * updating the 'rd%d' link, and communicating
2767 * with the personality with ->hot_*_disk.
2768 * For now we only support removing
2769 * failed/spare devices. This normally happens automatically,
2770 * but not when the metadata is externally managed.
2771 */
c303da6d
N
2772 if (rdev->raid_disk == -1)
2773 return -EEXIST;
2774 /* personality does all needed checks */
01393f3d 2775 if (rdev->mddev->pers->hot_remove_disk == NULL)
c303da6d 2776 return -EINVAL;
746d3207
N
2777 clear_bit(Blocked, &rdev->flags);
2778 remove_and_add_spares(rdev->mddev, rdev);
2779 if (rdev->raid_disk >= 0)
2780 return -EBUSY;
c303da6d
N
2781 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2782 md_wakeup_thread(rdev->mddev->thread);
6c2fce2e 2783 } else if (rdev->mddev->pers) {
6c2fce2e 2784 /* Activating a spare .. or possibly reactivating
6d56e278 2785 * if we ever get bitmaps working here.
6c2fce2e
NB
2786 */
2787
2788 if (rdev->raid_disk != -1)
2789 return -EBUSY;
2790
c6751b2b
N
2791 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2792 return -EBUSY;
2793
6c2fce2e
NB
2794 if (rdev->mddev->pers->hot_add_disk == NULL)
2795 return -EINVAL;
2796
ba1b41b6
N
2797 if (slot >= rdev->mddev->raid_disks &&
2798 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2799 return -ENOSPC;
2800
6c2fce2e
NB
2801 rdev->raid_disk = slot;
2802 if (test_bit(In_sync, &rdev->flags))
2803 rdev->saved_raid_disk = slot;
2804 else
2805 rdev->saved_raid_disk = -1;
d30519fc 2806 clear_bit(In_sync, &rdev->flags);
8313b8e5 2807 clear_bit(Bitmap_sync, &rdev->flags);
6c2fce2e
NB
2808 err = rdev->mddev->pers->
2809 hot_add_disk(rdev->mddev, rdev);
199050ea 2810 if (err) {
6c2fce2e 2811 rdev->raid_disk = -1;
6c2fce2e 2812 return err;
52664732 2813 } else
00bcb4ac 2814 sysfs_notify_dirent_safe(rdev->sysfs_state);
36fad858 2815 if (sysfs_link_rdev(rdev->mddev, rdev))
00bcb4ac 2816 /* failure here is OK */;
6c2fce2e 2817 /* don't wakeup anyone, leave that to userspace. */
c303da6d 2818 } else {
ba1b41b6
N
2819 if (slot >= rdev->mddev->raid_disks &&
2820 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
c303da6d
N
2821 return -ENOSPC;
2822 rdev->raid_disk = slot;
2823 /* assume it is working */
c5d79adb
N
2824 clear_bit(Faulty, &rdev->flags);
2825 clear_bit(WriteMostly, &rdev->flags);
c303da6d 2826 set_bit(In_sync, &rdev->flags);
00bcb4ac 2827 sysfs_notify_dirent_safe(rdev->sysfs_state);
c303da6d 2828 }
014236d2
N
2829 return len;
2830}
2831
2832
2833static struct rdev_sysfs_entry rdev_slot =
80ca3a44 2834__ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
014236d2 2835
93c8cad0 2836static ssize_t
3cb03002 2837offset_show(struct md_rdev *rdev, char *page)
93c8cad0 2838{
6961ece4 2839 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
93c8cad0
N
2840}
2841
2842static ssize_t
3cb03002 2843offset_store(struct md_rdev *rdev, const char *buf, size_t len)
93c8cad0 2844{
c6563a8c 2845 unsigned long long offset;
b29bebd6 2846 if (kstrtoull(buf, 10, &offset) < 0)
93c8cad0 2847 return -EINVAL;
8ed0a521 2848 if (rdev->mddev->pers && rdev->raid_disk >= 0)
93c8cad0 2849 return -EBUSY;
dd8ac336 2850 if (rdev->sectors && rdev->mddev->external)
c5d79adb
N
2851 /* Must set offset before size, so overlap checks
2852 * can be sane */
2853 return -EBUSY;
93c8cad0 2854 rdev->data_offset = offset;
25f7fd47 2855 rdev->new_data_offset = offset;
93c8cad0
N
2856 return len;
2857}
2858
2859static struct rdev_sysfs_entry rdev_offset =
80ca3a44 2860__ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
93c8cad0 2861
c6563a8c
N
2862static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2863{
2864 return sprintf(page, "%llu\n",
2865 (unsigned long long)rdev->new_data_offset);
2866}
2867
2868static ssize_t new_offset_store(struct md_rdev *rdev,
2869 const char *buf, size_t len)
2870{
2871 unsigned long long new_offset;
2872 struct mddev *mddev = rdev->mddev;
2873
b29bebd6 2874 if (kstrtoull(buf, 10, &new_offset) < 0)
c6563a8c
N
2875 return -EINVAL;
2876
2877 if (mddev->sync_thread)
2878 return -EBUSY;
2879 if (new_offset == rdev->data_offset)
2880 /* reset is always permitted */
2881 ;
2882 else if (new_offset > rdev->data_offset) {
2883 /* must not push array size beyond rdev_sectors */
2884 if (new_offset - rdev->data_offset
2885 + mddev->dev_sectors > rdev->sectors)
2886 return -E2BIG;
2887 }
2888 /* Metadata worries about other space details. */
2889
2890 /* decreasing the offset is inconsistent with a backwards
2891 * reshape.
2892 */
2893 if (new_offset < rdev->data_offset &&
2894 mddev->reshape_backwards)
2895 return -EINVAL;
2896 /* Increasing offset is inconsistent with forwards
2897 * reshape. reshape_direction should be set to
2898 * 'backwards' first.
2899 */
2900 if (new_offset > rdev->data_offset &&
2901 !mddev->reshape_backwards)
2902 return -EINVAL;
2903
2904 if (mddev->pers && mddev->persistent &&
2905 !super_types[mddev->major_version]
2906 .allow_new_offset(rdev, new_offset))
2907 return -E2BIG;
2908 rdev->new_data_offset = new_offset;
2909 if (new_offset > rdev->data_offset)
2910 mddev->reshape_backwards = 1;
2911 else if (new_offset < rdev->data_offset)
2912 mddev->reshape_backwards = 0;
2913
2914 return len;
2915}
2916static struct rdev_sysfs_entry rdev_new_offset =
2917__ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2918
83303b61 2919static ssize_t
3cb03002 2920rdev_size_show(struct md_rdev *rdev, char *page)
83303b61 2921{
dd8ac336 2922 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
83303b61
N
2923}
2924
c5d79adb
N
2925static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2926{
2927 /* check if two start/length pairs overlap */
2928 if (s1+l1 <= s2)
2929 return 0;
2930 if (s2+l2 <= s1)
2931 return 0;
2932 return 1;
2933}
2934
b522adcd
DW
2935static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2936{
2937 unsigned long long blocks;
2938 sector_t new;
2939
b29bebd6 2940 if (kstrtoull(buf, 10, &blocks) < 0)
b522adcd
DW
2941 return -EINVAL;
2942
2943 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2944 return -EINVAL; /* sector conversion overflow */
2945
2946 new = blocks * 2;
2947 if (new != blocks * 2)
2948 return -EINVAL; /* unsigned long long to sector_t overflow */
2949
2950 *sectors = new;
2951 return 0;
2952}
2953
83303b61 2954static ssize_t
3cb03002 2955rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
83303b61 2956{
fd01b88c 2957 struct mddev *my_mddev = rdev->mddev;
dd8ac336 2958 sector_t oldsectors = rdev->sectors;
b522adcd 2959 sector_t sectors;
27c529bb 2960
b522adcd 2961 if (strict_blocks_to_sectors(buf, &sectors) < 0)
d7027458 2962 return -EINVAL;
c6563a8c
N
2963 if (rdev->data_offset != rdev->new_data_offset)
2964 return -EINVAL; /* too confusing */
0cd17fec 2965 if (my_mddev->pers && rdev->raid_disk >= 0) {
d7027458 2966 if (my_mddev->persistent) {
dd8ac336
AN
2967 sectors = super_types[my_mddev->major_version].
2968 rdev_size_change(rdev, sectors);
2969 if (!sectors)
0cd17fec 2970 return -EBUSY;
dd8ac336 2971 } else if (!sectors)
77304d2a 2972 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
dd8ac336 2973 rdev->data_offset;
a6468539
N
2974 if (!my_mddev->pers->resize)
2975 /* Cannot change size for RAID0 or Linear etc */
2976 return -EINVAL;
0cd17fec 2977 }
dd8ac336 2978 if (sectors < my_mddev->dev_sectors)
7d3c6f87 2979 return -EINVAL; /* component must fit device */
0cd17fec 2980
dd8ac336
AN
2981 rdev->sectors = sectors;
2982 if (sectors > oldsectors && my_mddev->external) {
c5d79adb
N
2983 /* need to check that all other rdevs with the same ->bdev
2984 * do not overlap. We need to unlock the mddev to avoid
dd8ac336 2985 * a deadlock. We have already changed rdev->sectors, and if
c5d79adb
N
2986 * we have to change it back, we will have the lock again.
2987 */
fd01b88c 2988 struct mddev *mddev;
c5d79adb 2989 int overlap = 0;
159ec1fc 2990 struct list_head *tmp;
c5d79adb 2991
27c529bb 2992 mddev_unlock(my_mddev);
29ac4aa3 2993 for_each_mddev(mddev, tmp) {
3cb03002 2994 struct md_rdev *rdev2;
c5d79adb 2995
29f097c4 2996 mddev_lock_nointr(mddev);
dafb20fa 2997 rdev_for_each(rdev2, mddev)
f21e9ff7
N
2998 if (rdev->bdev == rdev2->bdev &&
2999 rdev != rdev2 &&
3000 overlaps(rdev->data_offset, rdev->sectors,
3001 rdev2->data_offset,
3002 rdev2->sectors)) {
c5d79adb
N
3003 overlap = 1;
3004 break;
3005 }
3006 mddev_unlock(mddev);
3007 if (overlap) {
3008 mddev_put(mddev);
3009 break;
3010 }
3011 }
29f097c4 3012 mddev_lock_nointr(my_mddev);
c5d79adb
N
3013 if (overlap) {
3014 /* Someone else could have slipped in a size
3015 * change here, but doing so is just silly.
dd8ac336 3016 * We put oldsectors back because we *know* it is
c5d79adb
N
3017 * safe, and trust userspace not to race with
3018 * itself
3019 */
dd8ac336 3020 rdev->sectors = oldsectors;
c5d79adb
N
3021 return -EBUSY;
3022 }
3023 }
83303b61
N
3024 return len;
3025}
3026
3027static struct rdev_sysfs_entry rdev_size =
80ca3a44 3028__ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
83303b61 3029
06e3c817 3030
3cb03002 3031static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
06e3c817
DW
3032{
3033 unsigned long long recovery_start = rdev->recovery_offset;
3034
3035 if (test_bit(In_sync, &rdev->flags) ||
3036 recovery_start == MaxSector)
3037 return sprintf(page, "none\n");
3038
3039 return sprintf(page, "%llu\n", recovery_start);
3040}
3041
3cb03002 3042static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
06e3c817
DW
3043{
3044 unsigned long long recovery_start;
3045
3046 if (cmd_match(buf, "none"))
3047 recovery_start = MaxSector;
b29bebd6 3048 else if (kstrtoull(buf, 10, &recovery_start))
06e3c817
DW
3049 return -EINVAL;
3050
3051 if (rdev->mddev->pers &&
3052 rdev->raid_disk >= 0)
3053 return -EBUSY;
3054
3055 rdev->recovery_offset = recovery_start;
3056 if (recovery_start == MaxSector)
3057 set_bit(In_sync, &rdev->flags);
3058 else
3059 clear_bit(In_sync, &rdev->flags);
3060 return len;
3061}
3062
3063static struct rdev_sysfs_entry rdev_recovery_start =
3064__ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3065
16c791a5
N
3066
3067static ssize_t
3068badblocks_show(struct badblocks *bb, char *page, int unack);
3069static ssize_t
3070badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);
3071
3cb03002 3072static ssize_t bb_show(struct md_rdev *rdev, char *page)
16c791a5
N
3073{
3074 return badblocks_show(&rdev->badblocks, page, 0);
3075}
3cb03002 3076static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
16c791a5 3077{
de393cde
N
3078 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3079 /* Maybe that ack was all we needed */
3080 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3081 wake_up(&rdev->blocked_wait);
3082 return rv;
16c791a5
N
3083}
3084static struct rdev_sysfs_entry rdev_bad_blocks =
3085__ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3086
3087
3cb03002 3088static ssize_t ubb_show(struct md_rdev *rdev, char *page)
16c791a5
N
3089{
3090 return badblocks_show(&rdev->badblocks, page, 1);
3091}
3cb03002 3092static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
16c791a5
N
3093{
3094 return badblocks_store(&rdev->badblocks, page, len, 1);
3095}
3096static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3097__ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3098
86e6ffdd
N
3099static struct attribute *rdev_default_attrs[] = {
3100 &rdev_state.attr,
4dbcdc75 3101 &rdev_errors.attr,
014236d2 3102 &rdev_slot.attr,
93c8cad0 3103 &rdev_offset.attr,
c6563a8c 3104 &rdev_new_offset.attr,
83303b61 3105 &rdev_size.attr,
06e3c817 3106 &rdev_recovery_start.attr,
16c791a5
N
3107 &rdev_bad_blocks.attr,
3108 &rdev_unack_bad_blocks.attr,
86e6ffdd
N
3109 NULL,
3110};
3111static ssize_t
3112rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3113{
3114 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3cb03002 3115 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
fd01b88c 3116 struct mddev *mddev = rdev->mddev;
27c529bb 3117 ssize_t rv;
86e6ffdd
N
3118
3119 if (!entry->show)
3120 return -EIO;
27c529bb
N
3121
3122 rv = mddev ? mddev_lock(mddev) : -EBUSY;
3123 if (!rv) {
3124 if (rdev->mddev == NULL)
3125 rv = -EBUSY;
3126 else
3127 rv = entry->show(rdev, page);
3128 mddev_unlock(mddev);
3129 }
3130 return rv;
86e6ffdd
N
3131}
3132
3133static ssize_t
3134rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3135 const char *page, size_t length)
3136{
3137 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3cb03002 3138 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
27c529bb 3139 ssize_t rv;
fd01b88c 3140 struct mddev *mddev = rdev->mddev;
86e6ffdd
N
3141
3142 if (!entry->store)
3143 return -EIO;
67463acb
N
3144 if (!capable(CAP_SYS_ADMIN))
3145 return -EACCES;
27c529bb 3146 rv = mddev ? mddev_lock(mddev): -EBUSY;
ca388059 3147 if (!rv) {
27c529bb
N
3148 if (rdev->mddev == NULL)
3149 rv = -EBUSY;
3150 else
3151 rv = entry->store(rdev, page, length);
6a51830e 3152 mddev_unlock(mddev);
ca388059
N
3153 }
3154 return rv;
86e6ffdd
N
3155}
3156
3157static void rdev_free(struct kobject *ko)
3158{
3cb03002 3159 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
86e6ffdd
N
3160 kfree(rdev);
3161}
52cf25d0 3162static const struct sysfs_ops rdev_sysfs_ops = {
86e6ffdd
N
3163 .show = rdev_attr_show,
3164 .store = rdev_attr_store,
3165};
3166static struct kobj_type rdev_ktype = {
3167 .release = rdev_free,
3168 .sysfs_ops = &rdev_sysfs_ops,
3169 .default_attrs = rdev_default_attrs,
3170};
3171
3cb03002 3172int md_rdev_init(struct md_rdev *rdev)
e8bb9a83
N
3173{
3174 rdev->desc_nr = -1;
3175 rdev->saved_raid_disk = -1;
3176 rdev->raid_disk = -1;
3177 rdev->flags = 0;
3178 rdev->data_offset = 0;
c6563a8c 3179 rdev->new_data_offset = 0;
e8bb9a83
N
3180 rdev->sb_events = 0;
3181 rdev->last_read_error.tv_sec = 0;
3182 rdev->last_read_error.tv_nsec = 0;
2699b672
N
3183 rdev->sb_loaded = 0;
3184 rdev->bb_page = NULL;
e8bb9a83
N
3185 atomic_set(&rdev->nr_pending, 0);
3186 atomic_set(&rdev->read_errors, 0);
3187 atomic_set(&rdev->corrected_errors, 0);
3188
3189 INIT_LIST_HEAD(&rdev->same_set);
3190 init_waitqueue_head(&rdev->blocked_wait);
2230dfe4
N
3191
3192 /* Add space to store bad block list.
3193 * This reserves the space even on arrays where it cannot
3194 * be used - I wonder if that matters
3195 */
3196 rdev->badblocks.count = 0;
486adf72 3197 rdev->badblocks.shift = -1; /* disabled until explicitly enabled */
2230dfe4
N
3198 rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
3199 seqlock_init(&rdev->badblocks.lock);
3200 if (rdev->badblocks.page == NULL)
3201 return -ENOMEM;
3202
3203 return 0;
e8bb9a83
N
3204}
3205EXPORT_SYMBOL_GPL(md_rdev_init);
1da177e4
LT
3206/*
3207 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3208 *
3209 * mark the device faulty if:
3210 *
3211 * - the device is nonexistent (zero size)
3212 * - the device has no valid superblock
3213 *
3214 * a faulty rdev _never_ has rdev->sb set.
3215 */
3cb03002 3216static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
1da177e4
LT
3217{
3218 char b[BDEVNAME_SIZE];
3219 int err;
3cb03002 3220 struct md_rdev *rdev;
1da177e4
LT
3221 sector_t size;
3222
9ffae0cf 3223 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1da177e4
LT
3224 if (!rdev) {
3225 printk(KERN_ERR "md: could not alloc mem for new device!\n");
3226 return ERR_PTR(-ENOMEM);
3227 }
1da177e4 3228
2230dfe4
N
3229 err = md_rdev_init(rdev);
3230 if (err)
3231 goto abort_free;
3232 err = alloc_disk_sb(rdev);
3233 if (err)
1da177e4
LT
3234 goto abort_free;
3235
c5d79adb 3236 err = lock_rdev(rdev, newdev, super_format == -2);
1da177e4
LT
3237 if (err)
3238 goto abort_free;
3239
f9cb074b 3240 kobject_init(&rdev->kobj, &rdev_ktype);
86e6ffdd 3241
77304d2a 3242 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
1da177e4
LT
3243 if (!size) {
3244 printk(KERN_WARNING
3245 "md: %s has zero or unknown size, marking faulty!\n",
3246 bdevname(rdev->bdev,b));
3247 err = -EINVAL;
3248 goto abort_free;
3249 }
3250
3251 if (super_format >= 0) {
3252 err = super_types[super_format].
3253 load_super(rdev, NULL, super_minor);
3254 if (err == -EINVAL) {
df968c4e
N
3255 printk(KERN_WARNING
3256 "md: %s does not have a valid v%d.%d "
3257 "superblock, not importing!\n",
3258 bdevname(rdev->bdev,b),
3259 super_format, super_minor);
1da177e4
LT
3260 goto abort_free;
3261 }
3262 if (err < 0) {
3263 printk(KERN_WARNING
3264 "md: could not read %s's sb, not importing!\n",
3265 bdevname(rdev->bdev,b));
3266 goto abort_free;
3267 }
3268 }
6bfe0b49 3269
1da177e4
LT
3270 return rdev;
3271
3272abort_free:
2699b672
N
3273 if (rdev->bdev)
3274 unlock_rdev(rdev);
545c8795 3275 md_rdev_clear(rdev);
1da177e4
LT
3276 kfree(rdev);
3277 return ERR_PTR(err);
3278}
3279
3280/*
3281 * Check a full RAID array for plausibility
3282 */
3283
3284
fd01b88c 3285static void analyze_sbs(struct mddev * mddev)
1da177e4
LT
3286{
3287 int i;
3cb03002 3288 struct md_rdev *rdev, *freshest, *tmp;
1da177e4
LT
3289 char b[BDEVNAME_SIZE];
3290
3291 freshest = NULL;
dafb20fa 3292 rdev_for_each_safe(rdev, tmp, mddev)
1da177e4
LT
3293 switch (super_types[mddev->major_version].
3294 load_super(rdev, freshest, mddev->minor_version)) {
3295 case 1:
3296 freshest = rdev;
3297 break;
3298 case 0:
3299 break;
3300 default:
3301 printk( KERN_ERR \
3302 "md: fatal superblock inconsistency in %s"
3303 " -- removing from array\n",
3304 bdevname(rdev->bdev,b));
3305 kick_rdev_from_array(rdev);
3306 }
3307
3308
3309 super_types[mddev->major_version].
3310 validate_super(mddev, freshest);
3311
3312 i = 0;
dafb20fa 3313 rdev_for_each_safe(rdev, tmp, mddev) {
233fca36
N
3314 if (mddev->max_disks &&
3315 (rdev->desc_nr >= mddev->max_disks ||
3316 i > mddev->max_disks)) {
de01dfad
N
3317 printk(KERN_WARNING
3318 "md: %s: %s: only %d devices permitted\n",
3319 mdname(mddev), bdevname(rdev->bdev, b),
3320 mddev->max_disks);
3321 kick_rdev_from_array(rdev);
3322 continue;
3323 }
1da177e4
LT
3324 if (rdev != freshest)
3325 if (super_types[mddev->major_version].
3326 validate_super(mddev, rdev)) {
3327 printk(KERN_WARNING "md: kicking non-fresh %s"
3328 " from array!\n",
3329 bdevname(rdev->bdev,b));
3330 kick_rdev_from_array(rdev);
3331 continue;
3332 }
3333 if (mddev->level == LEVEL_MULTIPATH) {
3334 rdev->desc_nr = i++;
3335 rdev->raid_disk = rdev->desc_nr;
b2d444d7 3336 set_bit(In_sync, &rdev->flags);
5e5e3e78 3337 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
a778b73f
N
3338 rdev->raid_disk = -1;
3339 clear_bit(In_sync, &rdev->flags);
1da177e4
LT
3340 }
3341 }
1da177e4
LT
3342}
3343
72e02075
N
3344/* Read a fixed-point number.
3345 * Numbers in sysfs attributes should be in "standard" units where
3346 * possible, so time should be in seconds.
3347 * However we internally use a a much smaller unit such as
3348 * milliseconds or jiffies.
3349 * This function takes a decimal number with a possible fractional
3350 * component, and produces an integer which is the result of
3351 * multiplying that number by 10^'scale'.
3352 * all without any floating-point arithmetic.
3353 */
3354int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3355{
3356 unsigned long result = 0;
3357 long decimals = -1;
3358 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3359 if (*cp == '.')
3360 decimals = 0;
3361 else if (decimals < scale) {
3362 unsigned int value;
3363 value = *cp - '0';
3364 result = result * 10 + value;
3365 if (decimals >= 0)
3366 decimals++;
3367 }
3368 cp++;
3369 }
3370 if (*cp == '\n')
3371 cp++;
3372 if (*cp)
3373 return -EINVAL;
3374 if (decimals < 0)
3375 decimals = 0;
3376 while (decimals < scale) {
3377 result *= 10;
3378 decimals ++;
3379 }
3380 *res = result;
3381 return 0;
3382}
3383
3384
19052c0e
N
3385static void md_safemode_timeout(unsigned long data);
3386
16f17b39 3387static ssize_t
fd01b88c 3388safe_delay_show(struct mddev *mddev, char *page)
16f17b39
N
3389{
3390 int msec = (mddev->safemode_delay*1000)/HZ;
3391 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3392}
3393static ssize_t
fd01b88c 3394safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
16f17b39 3395{
16f17b39 3396 unsigned long msec;
97ce0a7f 3397
72e02075 3398 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
16f17b39 3399 return -EINVAL;
16f17b39
N
3400 if (msec == 0)
3401 mddev->safemode_delay = 0;
3402 else {
19052c0e 3403 unsigned long old_delay = mddev->safemode_delay;
16f17b39
N
3404 mddev->safemode_delay = (msec*HZ)/1000;
3405 if (mddev->safemode_delay == 0)
3406 mddev->safemode_delay = 1;
275c51c4 3407 if (mddev->safemode_delay < old_delay || old_delay == 0)
19052c0e 3408 md_safemode_timeout((unsigned long)mddev);
16f17b39
N
3409 }
3410 return len;
3411}
3412static struct md_sysfs_entry md_safe_delay =
80ca3a44 3413__ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
16f17b39 3414
eae1701f 3415static ssize_t
fd01b88c 3416level_show(struct mddev *mddev, char *page)
eae1701f 3417{
84fc4b56 3418 struct md_personality *p = mddev->pers;
d9d166c2 3419 if (p)
eae1701f 3420 return sprintf(page, "%s\n", p->name);
d9d166c2
N
3421 else if (mddev->clevel[0])
3422 return sprintf(page, "%s\n", mddev->clevel);
3423 else if (mddev->level != LEVEL_NONE)
3424 return sprintf(page, "%d\n", mddev->level);
3425 else
3426 return 0;
eae1701f
N
3427}
3428
d9d166c2 3429static ssize_t
fd01b88c 3430level_store(struct mddev *mddev, const char *buf, size_t len)
d9d166c2 3431{
f2859af6 3432 char clevel[16];
20a49ff6 3433 ssize_t rv = len;
84fc4b56 3434 struct md_personality *pers;
f2859af6 3435 long level;
245f46c2 3436 void *priv;
3cb03002 3437 struct md_rdev *rdev;
245f46c2
N
3438
3439 if (mddev->pers == NULL) {
3440 if (len == 0)
3441 return 0;
3442 if (len >= sizeof(mddev->clevel))
3443 return -ENOSPC;
3444 strncpy(mddev->clevel, buf, len);
3445 if (mddev->clevel[len-1] == '\n')
3446 len--;
3447 mddev->clevel[len] = 0;
3448 mddev->level = LEVEL_NONE;
3449 return rv;
3450 }
3451
3452 /* request to change the personality. Need to ensure:
3453 * - array is not engaged in resync/recovery/reshape
3454 * - old personality can be suspended
3455 * - new personality will access other array.
3456 */
3457
bb4f1e9d
N
3458 if (mddev->sync_thread ||
3459 mddev->reshape_position != MaxSector ||
3460 mddev->sysfs_active)
d9d166c2 3461 return -EBUSY;
245f46c2
N
3462
3463 if (!mddev->pers->quiesce) {
3464 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3465 mdname(mddev), mddev->pers->name);
3466 return -EINVAL;
3467 }
3468
3469 /* Now find the new personality */
f2859af6 3470 if (len == 0 || len >= sizeof(clevel))
245f46c2 3471 return -EINVAL;
f2859af6
DW
3472 strncpy(clevel, buf, len);
3473 if (clevel[len-1] == '\n')
d9d166c2 3474 len--;
f2859af6 3475 clevel[len] = 0;
b29bebd6 3476 if (kstrtol(clevel, 10, &level))
f2859af6 3477 level = LEVEL_NONE;
245f46c2 3478
f2859af6
DW
3479 if (request_module("md-%s", clevel) != 0)
3480 request_module("md-level-%s", clevel);
245f46c2 3481 spin_lock(&pers_lock);
f2859af6 3482 pers = find_pers(level, clevel);
245f46c2
N
3483 if (!pers || !try_module_get(pers->owner)) {
3484 spin_unlock(&pers_lock);
f2859af6 3485 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
245f46c2
N
3486 return -EINVAL;
3487 }
3488 spin_unlock(&pers_lock);
3489
3490 if (pers == mddev->pers) {
3491 /* Nothing to do! */
3492 module_put(pers->owner);
3493 return rv;
3494 }
3495 if (!pers->takeover) {
3496 module_put(pers->owner);
3497 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
f2859af6 3498 mdname(mddev), clevel);
245f46c2
N
3499 return -EINVAL;
3500 }
3501
dafb20fa 3502 rdev_for_each(rdev, mddev)
e93f68a1
N
3503 rdev->new_raid_disk = rdev->raid_disk;
3504
245f46c2
N
3505 /* ->takeover must set new_* and/or delta_disks
3506 * if it succeeds, and may set them when it fails.
3507 */
3508 priv = pers->takeover(mddev);
3509 if (IS_ERR(priv)) {
3510 mddev->new_level = mddev->level;
3511 mddev->new_layout = mddev->layout;
664e7c41 3512 mddev->new_chunk_sectors = mddev->chunk_sectors;
245f46c2
N
3513 mddev->raid_disks -= mddev->delta_disks;
3514 mddev->delta_disks = 0;
2c810cdd 3515 mddev->reshape_backwards = 0;
245f46c2
N
3516 module_put(pers->owner);
3517 printk(KERN_WARNING "md: %s: %s would not accept array\n",
f2859af6 3518 mdname(mddev), clevel);
245f46c2
N
3519 return PTR_ERR(priv);
3520 }
3521
3522 /* Looks like we have a winner */
3523 mddev_suspend(mddev);
3524 mddev->pers->stop(mddev);
a64c876f
N
3525
3526 if (mddev->pers->sync_request == NULL &&
3527 pers->sync_request != NULL) {
3528 /* need to add the md_redundancy_group */
3529 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3530 printk(KERN_WARNING
3531 "md: cannot register extra attributes for %s\n",
3532 mdname(mddev));
388975cc 3533 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
a64c876f
N
3534 }
3535 if (mddev->pers->sync_request != NULL &&
3536 pers->sync_request == NULL) {
3537 /* need to remove the md_redundancy_group */
3538 if (mddev->to_remove == NULL)
3539 mddev->to_remove = &md_redundancy_group;
3540 }
3541
54071b38
TM
3542 if (mddev->pers->sync_request == NULL &&
3543 mddev->external) {
3544 /* We are converting from a no-redundancy array
3545 * to a redundancy array and metadata is managed
3546 * externally so we need to be sure that writes
3547 * won't block due to a need to transition
3548 * clean->dirty
3549 * until external management is started.
3550 */
3551 mddev->in_sync = 0;
3552 mddev->safemode_delay = 0;
3553 mddev->safemode = 0;
3554 }
3555
dafb20fa 3556 rdev_for_each(rdev, mddev) {
e93f68a1
N
3557 if (rdev->raid_disk < 0)
3558 continue;
bf2cb0da 3559 if (rdev->new_raid_disk >= mddev->raid_disks)
e93f68a1
N
3560 rdev->new_raid_disk = -1;
3561 if (rdev->new_raid_disk == rdev->raid_disk)
3562 continue;
36fad858 3563 sysfs_unlink_rdev(mddev, rdev);
e93f68a1 3564 }
dafb20fa 3565 rdev_for_each(rdev, mddev) {
e93f68a1
N
3566 if (rdev->raid_disk < 0)
3567 continue;
3568 if (rdev->new_raid_disk == rdev->raid_disk)
3569 continue;
3570 rdev->raid_disk = rdev->new_raid_disk;
3571 if (rdev->raid_disk < 0)
3a981b03 3572 clear_bit(In_sync, &rdev->flags);
e93f68a1 3573 else {
36fad858
NK
3574 if (sysfs_link_rdev(mddev, rdev))
3575 printk(KERN_WARNING "md: cannot register rd%d"
3576 " for %s after level change\n",
3577 rdev->raid_disk, mdname(mddev));
3a981b03 3578 }
e93f68a1
N
3579 }
3580
3581 module_put(mddev->pers->owner);
245f46c2
N
3582 mddev->pers = pers;
3583 mddev->private = priv;
3584 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3585 mddev->level = mddev->new_level;
3586 mddev->layout = mddev->new_layout;
664e7c41 3587 mddev->chunk_sectors = mddev->new_chunk_sectors;
245f46c2 3588 mddev->delta_disks = 0;
2c810cdd 3589 mddev->reshape_backwards = 0;
fee68723 3590 mddev->degraded = 0;
9af204cf
TM
3591 if (mddev->pers->sync_request == NULL) {
3592 /* this is now an array without redundancy, so
3593 * it must always be in_sync
3594 */
3595 mddev->in_sync = 1;
3596 del_timer_sync(&mddev->safemode_timer);
3597 }
02e5f5c0 3598 blk_set_stacking_limits(&mddev->queue->limits);
245f46c2 3599 pers->run(mddev);
245f46c2 3600 set_bit(MD_CHANGE_DEVS, &mddev->flags);
47525e59 3601 mddev_resume(mddev);
830778a1
N
3602 if (!mddev->thread)
3603 md_update_sb(mddev, 1);
5cac7861 3604 sysfs_notify(&mddev->kobj, NULL, "level");
bb7f8d22 3605 md_new_event(mddev);
d9d166c2
N
3606 return rv;
3607}
3608
3609static struct md_sysfs_entry md_level =
80ca3a44 3610__ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
eae1701f 3611
d4dbd025
N
3612
3613static ssize_t
fd01b88c 3614layout_show(struct mddev *mddev, char *page)
d4dbd025
N
3615{
3616 /* just a number, not meaningful for all levels */
08a02ecd
N
3617 if (mddev->reshape_position != MaxSector &&
3618 mddev->layout != mddev->new_layout)
3619 return sprintf(page, "%d (%d)\n",
3620 mddev->new_layout, mddev->layout);
d4dbd025
N
3621 return sprintf(page, "%d\n", mddev->layout);
3622}
3623
3624static ssize_t
fd01b88c 3625layout_store(struct mddev *mddev, const char *buf, size_t len)
d4dbd025
N
3626{
3627 char *e;
3628 unsigned long n = simple_strtoul(buf, &e, 10);
d4dbd025
N
3629
3630 if (!*buf || (*e && *e != '\n'))
3631 return -EINVAL;
3632
b3546035
N
3633 if (mddev->pers) {
3634 int err;
50ac168a 3635 if (mddev->pers->check_reshape == NULL)
b3546035 3636 return -EBUSY;
597a711b 3637 mddev->new_layout = n;
50ac168a 3638 err = mddev->pers->check_reshape(mddev);
597a711b
N
3639 if (err) {
3640 mddev->new_layout = mddev->layout;
b3546035 3641 return err;
597a711b 3642 }
b3546035 3643 } else {
08a02ecd 3644 mddev->new_layout = n;
b3546035
N
3645 if (mddev->reshape_position == MaxSector)
3646 mddev->layout = n;
3647 }
d4dbd025
N
3648 return len;
3649}
3650static struct md_sysfs_entry md_layout =
80ca3a44 3651__ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
d4dbd025
N
3652
3653
eae1701f 3654static ssize_t
fd01b88c 3655raid_disks_show(struct mddev *mddev, char *page)
eae1701f 3656{
bb636547
N
3657 if (mddev->raid_disks == 0)
3658 return 0;
08a02ecd
N
3659 if (mddev->reshape_position != MaxSector &&
3660 mddev->delta_disks != 0)
3661 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3662 mddev->raid_disks - mddev->delta_disks);
eae1701f
N
3663 return sprintf(page, "%d\n", mddev->raid_disks);
3664}
3665
fd01b88c 3666static int update_raid_disks(struct mddev *mddev, int raid_disks);
da943b99
N
3667
3668static ssize_t
fd01b88c 3669raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
da943b99 3670{
da943b99
N
3671 char *e;
3672 int rv = 0;
3673 unsigned long n = simple_strtoul(buf, &e, 10);
3674
3675 if (!*buf || (*e && *e != '\n'))
3676 return -EINVAL;
3677
3678 if (mddev->pers)
3679 rv = update_raid_disks(mddev, n);
08a02ecd 3680 else if (mddev->reshape_position != MaxSector) {
c6563a8c 3681 struct md_rdev *rdev;
08a02ecd 3682 int olddisks = mddev->raid_disks - mddev->delta_disks;
c6563a8c
N
3683
3684 rdev_for_each(rdev, mddev) {
3685 if (olddisks < n &&
3686 rdev->data_offset < rdev->new_data_offset)
3687 return -EINVAL;
3688 if (olddisks > n &&
3689 rdev->data_offset > rdev->new_data_offset)
3690 return -EINVAL;
3691 }
08a02ecd
N
3692 mddev->delta_disks = n - olddisks;
3693 mddev->raid_disks = n;
2c810cdd 3694 mddev->reshape_backwards = (mddev->delta_disks < 0);
08a02ecd 3695 } else
da943b99
N
3696 mddev->raid_disks = n;
3697 return rv ? rv : len;
3698}
3699static struct md_sysfs_entry md_raid_disks =
80ca3a44 3700__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
eae1701f 3701
3b34380a 3702static ssize_t
fd01b88c 3703chunk_size_show(struct mddev *mddev, char *page)
3b34380a 3704{
08a02ecd 3705 if (mddev->reshape_position != MaxSector &&
664e7c41
AN
3706 mddev->chunk_sectors != mddev->new_chunk_sectors)
3707 return sprintf(page, "%d (%d)\n",
3708 mddev->new_chunk_sectors << 9,
9d8f0363
AN
3709 mddev->chunk_sectors << 9);
3710 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3b34380a
N
3711}
3712
3713static ssize_t
fd01b88c 3714chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3b34380a 3715{
3b34380a
N
3716 char *e;
3717 unsigned long n = simple_strtoul(buf, &e, 10);
3718
3b34380a
N
3719 if (!*buf || (*e && *e != '\n'))
3720 return -EINVAL;
3721
b3546035
N
3722 if (mddev->pers) {
3723 int err;
50ac168a 3724 if (mddev->pers->check_reshape == NULL)
b3546035 3725 return -EBUSY;
597a711b 3726 mddev->new_chunk_sectors = n >> 9;
50ac168a 3727 err = mddev->pers->check_reshape(mddev);
597a711b
N
3728 if (err) {
3729 mddev->new_chunk_sectors = mddev->chunk_sectors;
b3546035 3730 return err;
597a711b 3731 }
b3546035 3732 } else {
664e7c41 3733 mddev->new_chunk_sectors = n >> 9;
b3546035 3734 if (mddev->reshape_position == MaxSector)
9d8f0363 3735 mddev->chunk_sectors = n >> 9;
b3546035 3736 }
3b34380a
N
3737 return len;
3738}
3739static struct md_sysfs_entry md_chunk_size =
80ca3a44 3740__ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3b34380a 3741
a94213b1 3742static ssize_t
fd01b88c 3743resync_start_show(struct mddev *mddev, char *page)
a94213b1 3744{
d1a7c503
N
3745 if (mddev->recovery_cp == MaxSector)
3746 return sprintf(page, "none\n");
a94213b1
N
3747 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3748}
3749
3750static ssize_t
fd01b88c 3751resync_start_store(struct mddev *mddev, const char *buf, size_t len)
a94213b1 3752{
a94213b1
N
3753 char *e;
3754 unsigned long long n = simple_strtoull(buf, &e, 10);
3755
b098636c 3756 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
a94213b1 3757 return -EBUSY;
06e3c817
DW
3758 if (cmd_match(buf, "none"))
3759 n = MaxSector;
3760 else if (!*buf || (*e && *e != '\n'))
a94213b1
N
3761 return -EINVAL;
3762
3763 mddev->recovery_cp = n;
db07d85e
N
3764 if (mddev->pers)
3765 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
a94213b1
N
3766 return len;
3767}
3768static struct md_sysfs_entry md_resync_start =
80ca3a44 3769__ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
a94213b1 3770
9e653b63
N
3771/*
3772 * The array state can be:
3773 *
3774 * clear
3775 * No devices, no size, no level
3776 * Equivalent to STOP_ARRAY ioctl
3777 * inactive
3778 * May have some settings, but array is not active
3779 * all IO results in error
3780 * When written, doesn't tear down array, but just stops it
3781 * suspended (not supported yet)
3782 * All IO requests will block. The array can be reconfigured.
910d8cb3 3783 * Writing this, if accepted, will block until array is quiescent
9e653b63
N
3784 * readonly
3785 * no resync can happen. no superblocks get written.
3786 * write requests fail
3787 * read-auto
3788 * like readonly, but behaves like 'clean' on a write request.
3789 *
3790 * clean - no pending writes, but otherwise active.
3791 * When written to inactive array, starts without resync
3792 * If a write request arrives then
3793 * if metadata is known, mark 'dirty' and switch to 'active'.
3794 * if not known, block and switch to write-pending
3795 * If written to an active array that has pending writes, then fails.
3796 * active
3797 * fully active: IO and resync can be happening.
3798 * When written to inactive array, starts with resync
3799 *
3800 * write-pending
3801 * clean, but writes are blocked waiting for 'active' to be written.
3802 *
3803 * active-idle
3804 * like active, but no writes have been seen for a while (100msec).
3805 *
3806 */
3807enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3808 write_pending, active_idle, bad_word};
05381954 3809static char *array_states[] = {
9e653b63
N
3810 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3811 "write-pending", "active-idle", NULL };
3812
3813static int match_word(const char *word, char **list)
3814{
3815 int n;
3816 for (n=0; list[n]; n++)
3817 if (cmd_match(word, list[n]))
3818 break;
3819 return n;
3820}
3821
3822static ssize_t
fd01b88c 3823array_state_show(struct mddev *mddev, char *page)
9e653b63
N
3824{
3825 enum array_state st = inactive;
3826
3827 if (mddev->pers)
3828 switch(mddev->ro) {
3829 case 1:
3830 st = readonly;
3831 break;
3832 case 2:
3833 st = read_auto;
3834 break;
3835 case 0:
3836 if (mddev->in_sync)
3837 st = clean;
070dc6dd 3838 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
e691063a 3839 st = write_pending;
9e653b63
N
3840 else if (mddev->safemode)
3841 st = active_idle;
3842 else
3843 st = active;
3844 }
3845 else {
3846 if (list_empty(&mddev->disks) &&
3847 mddev->raid_disks == 0 &&
58c0fed4 3848 mddev->dev_sectors == 0)
9e653b63
N
3849 st = clear;
3850 else
3851 st = inactive;
3852 }
3853 return sprintf(page, "%s\n", array_states[st]);
3854}
3855
a05b7ea0
N
3856static int do_md_stop(struct mddev * mddev, int ro, struct block_device *bdev);
3857static int md_set_readonly(struct mddev * mddev, struct block_device *bdev);
fd01b88c
N
3858static int do_md_run(struct mddev * mddev);
3859static int restart_array(struct mddev *mddev);
9e653b63
N
3860
3861static ssize_t
fd01b88c 3862array_state_store(struct mddev *mddev, const char *buf, size_t len)
9e653b63
N
3863{
3864 int err = -EINVAL;
3865 enum array_state st = match_word(buf, array_states);
3866 switch(st) {
3867 case bad_word:
3868 break;
3869 case clear:
3870 /* stopping an active array */
a05b7ea0 3871 err = do_md_stop(mddev, 0, NULL);
9e653b63
N
3872 break;
3873 case inactive:
3874 /* stopping an active array */
90cf195d 3875 if (mddev->pers)
a05b7ea0 3876 err = do_md_stop(mddev, 2, NULL);
90cf195d 3877 else
e691063a 3878 err = 0; /* already inactive */
9e653b63
N
3879 break;
3880 case suspended:
3881 break; /* not supported yet */
3882 case readonly:
3883 if (mddev->pers)
a05b7ea0 3884 err = md_set_readonly(mddev, NULL);
9e653b63
N
3885 else {
3886 mddev->ro = 1;
648b629e 3887 set_disk_ro(mddev->gendisk, 1);
9e653b63
N
3888 err = do_md_run(mddev);
3889 }
3890 break;
3891 case read_auto:
9e653b63 3892 if (mddev->pers) {
80268ee9 3893 if (mddev->ro == 0)
a05b7ea0 3894 err = md_set_readonly(mddev, NULL);
80268ee9 3895 else if (mddev->ro == 1)
648b629e
N
3896 err = restart_array(mddev);
3897 if (err == 0) {
3898 mddev->ro = 2;
3899 set_disk_ro(mddev->gendisk, 0);
3900 }
9e653b63
N
3901 } else {
3902 mddev->ro = 2;
3903 err = do_md_run(mddev);
3904 }
3905 break;
3906 case clean:
3907 if (mddev->pers) {
3908 restart_array(mddev);
3909 spin_lock_irq(&mddev->write_lock);
3910 if (atomic_read(&mddev->writes_pending) == 0) {
e691063a
N
3911 if (mddev->in_sync == 0) {
3912 mddev->in_sync = 1;
31a59e34
N
3913 if (mddev->safemode == 1)
3914 mddev->safemode = 0;
070dc6dd 3915 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
e691063a
N
3916 }
3917 err = 0;
3918 } else
3919 err = -EBUSY;
9e653b63 3920 spin_unlock_irq(&mddev->write_lock);
5bf29597
N
3921 } else
3922 err = -EINVAL;
9e653b63
N
3923 break;
3924 case active:
3925 if (mddev->pers) {
3926 restart_array(mddev);
070dc6dd 3927 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
9e653b63
N
3928 wake_up(&mddev->sb_wait);
3929 err = 0;
3930 } else {
3931 mddev->ro = 0;
648b629e 3932 set_disk_ro(mddev->gendisk, 0);
9e653b63
N
3933 err = do_md_run(mddev);
3934 }
3935 break;
3936 case write_pending:
3937 case active_idle:
3938 /* these cannot be set */
3939 break;
3940 }
3941 if (err)
3942 return err;
0fd62b86 3943 else {
1d23f178
N
3944 if (mddev->hold_active == UNTIL_IOCTL)
3945 mddev->hold_active = 0;
00bcb4ac 3946 sysfs_notify_dirent_safe(mddev->sysfs_state);
9e653b63 3947 return len;
0fd62b86 3948 }
9e653b63 3949}
80ca3a44
N
3950static struct md_sysfs_entry md_array_state =
3951__ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
9e653b63 3952
1e50915f 3953static ssize_t
fd01b88c 3954max_corrected_read_errors_show(struct mddev *mddev, char *page) {
1e50915f
RB
3955 return sprintf(page, "%d\n",
3956 atomic_read(&mddev->max_corr_read_errors));
3957}
3958
3959static ssize_t
fd01b88c 3960max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
1e50915f
RB
3961{
3962 char *e;
3963 unsigned long n = simple_strtoul(buf, &e, 10);
3964
3965 if (*buf && (*e == 0 || *e == '\n')) {
3966 atomic_set(&mddev->max_corr_read_errors, n);
3967 return len;
3968 }
3969 return -EINVAL;
3970}
3971
3972static struct md_sysfs_entry max_corr_read_errors =
3973__ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3974 max_corrected_read_errors_store);
3975
6d7ff738 3976static ssize_t
fd01b88c 3977null_show(struct mddev *mddev, char *page)
6d7ff738
N
3978{
3979 return -EINVAL;
3980}
3981
3982static ssize_t
fd01b88c 3983new_dev_store(struct mddev *mddev, const char *buf, size_t len)
6d7ff738
N
3984{
3985 /* buf must be %d:%d\n? giving major and minor numbers */
3986 /* The new device is added to the array.
3987 * If the array has a persistent superblock, we read the
3988 * superblock to initialise info and check validity.
3989 * Otherwise, only checking done is that in bind_rdev_to_array,
3990 * which mainly checks size.
3991 */
3992 char *e;
3993 int major = simple_strtoul(buf, &e, 10);
3994 int minor;
3995 dev_t dev;
3cb03002 3996 struct md_rdev *rdev;
6d7ff738
N
3997 int err;
3998
3999 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4000 return -EINVAL;
4001 minor = simple_strtoul(e+1, &e, 10);
4002 if (*e && *e != '\n')
4003 return -EINVAL;
4004 dev = MKDEV(major, minor);
4005 if (major != MAJOR(dev) ||
4006 minor != MINOR(dev))
4007 return -EOVERFLOW;
4008
4009
4010 if (mddev->persistent) {
4011 rdev = md_import_device(dev, mddev->major_version,
4012 mddev->minor_version);
4013 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3cb03002
N
4014 struct md_rdev *rdev0
4015 = list_entry(mddev->disks.next,
4016 struct md_rdev, same_set);
6d7ff738
N
4017 err = super_types[mddev->major_version]
4018 .load_super(rdev, rdev0, mddev->minor_version);
4019 if (err < 0)
4020 goto out;
4021 }
c5d79adb
N
4022 } else if (mddev->external)
4023 rdev = md_import_device(dev, -2, -1);
4024 else
6d7ff738
N
4025 rdev = md_import_device(dev, -1, -1);
4026
4027 if (IS_ERR(rdev))
4028 return PTR_ERR(rdev);
4029 err = bind_rdev_to_array(rdev, mddev);
4030 out:
4031 if (err)
4032 export_rdev(rdev);
4033 return err ? err : len;
4034}
4035
4036static struct md_sysfs_entry md_new_device =
80ca3a44 4037__ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3b34380a 4038
9b1d1dac 4039static ssize_t
fd01b88c 4040bitmap_store(struct mddev *mddev, const char *buf, size_t len)
9b1d1dac
PC
4041{
4042 char *end;
4043 unsigned long chunk, end_chunk;
4044
4045 if (!mddev->bitmap)
4046 goto out;
4047 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4048 while (*buf) {
4049 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4050 if (buf == end) break;
4051 if (*end == '-') { /* range */
4052 buf = end + 1;
4053 end_chunk = simple_strtoul(buf, &end, 0);
4054 if (buf == end) break;
4055 }
4056 if (*end && !isspace(*end)) break;
4057 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
e7d2860b 4058 buf = skip_spaces(end);
9b1d1dac
PC
4059 }
4060 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4061out:
4062 return len;
4063}
4064
4065static struct md_sysfs_entry md_bitmap =
4066__ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4067
a35b0d69 4068static ssize_t
fd01b88c 4069size_show(struct mddev *mddev, char *page)
a35b0d69 4070{
58c0fed4
AN
4071 return sprintf(page, "%llu\n",
4072 (unsigned long long)mddev->dev_sectors / 2);
a35b0d69
N
4073}
4074
fd01b88c 4075static int update_size(struct mddev *mddev, sector_t num_sectors);
a35b0d69
N
4076
4077static ssize_t
fd01b88c 4078size_store(struct mddev *mddev, const char *buf, size_t len)
a35b0d69
N
4079{
4080 /* If array is inactive, we can reduce the component size, but
4081 * not increase it (except from 0).
4082 * If array is active, we can try an on-line resize
4083 */
b522adcd
DW
4084 sector_t sectors;
4085 int err = strict_blocks_to_sectors(buf, &sectors);
a35b0d69 4086
58c0fed4
AN
4087 if (err < 0)
4088 return err;
a35b0d69 4089 if (mddev->pers) {
58c0fed4 4090 err = update_size(mddev, sectors);
850b2b42 4091 md_update_sb(mddev, 1);
a35b0d69 4092 } else {
58c0fed4
AN
4093 if (mddev->dev_sectors == 0 ||
4094 mddev->dev_sectors > sectors)
4095 mddev->dev_sectors = sectors;
a35b0d69
N
4096 else
4097 err = -ENOSPC;
4098 }
4099 return err ? err : len;
4100}
4101
4102static struct md_sysfs_entry md_size =
80ca3a44 4103__ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
a35b0d69 4104
8bb93aac 4105
83f0d77a 4106/* Metadata version.
e691063a
N
4107 * This is one of
4108 * 'none' for arrays with no metadata (good luck...)
4109 * 'external' for arrays with externally managed metadata,
8bb93aac
N
4110 * or N.M for internally known formats
4111 */
4112static ssize_t
fd01b88c 4113metadata_show(struct mddev *mddev, char *page)
8bb93aac
N
4114{
4115 if (mddev->persistent)
4116 return sprintf(page, "%d.%d\n",
4117 mddev->major_version, mddev->minor_version);
e691063a
N
4118 else if (mddev->external)
4119 return sprintf(page, "external:%s\n", mddev->metadata_type);
8bb93aac
N
4120 else
4121 return sprintf(page, "none\n");
4122}
4123
4124static ssize_t
fd01b88c 4125metadata_store(struct mddev *mddev, const char *buf, size_t len)
8bb93aac
N
4126{
4127 int major, minor;
4128 char *e;
ea43ddd8
N
4129 /* Changing the details of 'external' metadata is
4130 * always permitted. Otherwise there must be
4131 * no devices attached to the array.
4132 */
4133 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4134 ;
4135 else if (!list_empty(&mddev->disks))
8bb93aac
N
4136 return -EBUSY;
4137
4138 if (cmd_match(buf, "none")) {
4139 mddev->persistent = 0;
e691063a
N
4140 mddev->external = 0;
4141 mddev->major_version = 0;
4142 mddev->minor_version = 90;
4143 return len;
4144 }
4145 if (strncmp(buf, "external:", 9) == 0) {
20a49ff6 4146 size_t namelen = len-9;
e691063a
N
4147 if (namelen >= sizeof(mddev->metadata_type))
4148 namelen = sizeof(mddev->metadata_type)-1;
4149 strncpy(mddev->metadata_type, buf+9, namelen);
4150 mddev->metadata_type[namelen] = 0;
4151 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4152 mddev->metadata_type[--namelen] = 0;
4153 mddev->persistent = 0;
4154 mddev->external = 1;
8bb93aac
N
4155 mddev->major_version = 0;
4156 mddev->minor_version = 90;
4157 return len;
4158 }
4159 major = simple_strtoul(buf, &e, 10);
4160 if (e==buf || *e != '.')
4161 return -EINVAL;
4162 buf = e+1;
4163 minor = simple_strtoul(buf, &e, 10);
3f9d7b0d 4164 if (e==buf || (*e && *e != '\n') )
8bb93aac 4165 return -EINVAL;
50511da3 4166 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
8bb93aac
N
4167 return -ENOENT;
4168 mddev->major_version = major;
4169 mddev->minor_version = minor;
4170 mddev->persistent = 1;
e691063a 4171 mddev->external = 0;
8bb93aac
N
4172 return len;
4173}
4174
4175static struct md_sysfs_entry md_metadata =
80ca3a44 4176__ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
8bb93aac 4177
24dd469d 4178static ssize_t
fd01b88c 4179action_show(struct mddev *mddev, char *page)
24dd469d 4180{
7eec314d 4181 char *type = "idle";
b6a9ce68
N
4182 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4183 type = "frozen";
4184 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2b12ab6d 4185 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
ccfcc3c1
N
4186 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4187 type = "reshape";
4188 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N
4189 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
4190 type = "resync";
4191 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
4192 type = "check";
4193 else
4194 type = "repair";
72a23c21 4195 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
24dd469d
N
4196 type = "recover";
4197 }
4198 return sprintf(page, "%s\n", type);
4199}
4200
4201static ssize_t
fd01b88c 4202action_store(struct mddev *mddev, const char *page, size_t len)
24dd469d 4203{
7eec314d
N
4204 if (!mddev->pers || !mddev->pers->sync_request)
4205 return -EINVAL;
4206
b6a9ce68
N
4207 if (cmd_match(page, "frozen"))
4208 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4209 else
4210 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4211
4212 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
7eec314d
N
4213 if (mddev->sync_thread) {
4214 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
a91d5ac0 4215 md_reap_sync_thread(mddev);
7eec314d 4216 }
03c902e1
N
4217 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4218 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 4219 return -EBUSY;
72a23c21
NB
4220 else if (cmd_match(page, "resync"))
4221 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4222 else if (cmd_match(page, "recover")) {
4223 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7eec314d 4224 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
72a23c21 4225 } else if (cmd_match(page, "reshape")) {
16484bf5
N
4226 int err;
4227 if (mddev->pers->start_reshape == NULL)
4228 return -EINVAL;
4229 err = mddev->pers->start_reshape(mddev);
4230 if (err)
4231 return err;
a99ac971 4232 sysfs_notify(&mddev->kobj, NULL, "degraded");
16484bf5 4233 } else {
bce74dac 4234 if (cmd_match(page, "check"))
7eec314d 4235 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2adc7d47 4236 else if (!cmd_match(page, "repair"))
7eec314d
N
4237 return -EINVAL;
4238 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4239 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7eec314d 4240 }
48c26ddc
N
4241 if (mddev->ro == 2) {
4242 /* A write to sync_action is enough to justify
4243 * canceling read-auto mode
4244 */
4245 mddev->ro = 0;
4246 md_wakeup_thread(mddev->sync_thread);
4247 }
03c902e1 4248 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d 4249 md_wakeup_thread(mddev->thread);
00bcb4ac 4250 sysfs_notify_dirent_safe(mddev->sysfs_action);
24dd469d
N
4251 return len;
4252}
4253
c4a39551
JB
4254static struct md_sysfs_entry md_scan_mode =
4255__ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4256
4257static ssize_t
4258last_sync_action_show(struct mddev *mddev, char *page)
4259{
4260 return sprintf(page, "%s\n", mddev->last_sync_action);
4261}
4262
4263static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4264
9d88883e 4265static ssize_t
fd01b88c 4266mismatch_cnt_show(struct mddev *mddev, char *page)
9d88883e
N
4267{
4268 return sprintf(page, "%llu\n",
7f7583d4
JM
4269 (unsigned long long)
4270 atomic64_read(&mddev->resync_mismatches));
9d88883e
N
4271}
4272
80ca3a44 4273static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 4274
88202a0c 4275static ssize_t
fd01b88c 4276sync_min_show(struct mddev *mddev, char *page)
88202a0c
N
4277{
4278 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4279 mddev->sync_speed_min ? "local": "system");
4280}
4281
4282static ssize_t
fd01b88c 4283sync_min_store(struct mddev *mddev, const char *buf, size_t len)
88202a0c
N
4284{
4285 int min;
4286 char *e;
4287 if (strncmp(buf, "system", 6)==0) {
4288 mddev->sync_speed_min = 0;
4289 return len;
4290 }
4291 min = simple_strtoul(buf, &e, 10);
4292 if (buf == e || (*e && *e != '\n') || min <= 0)
4293 return -EINVAL;
4294 mddev->sync_speed_min = min;
4295 return len;
4296}
4297
4298static struct md_sysfs_entry md_sync_min =
4299__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4300
4301static ssize_t
fd01b88c 4302sync_max_show(struct mddev *mddev, char *page)
88202a0c
N
4303{
4304 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4305 mddev->sync_speed_max ? "local": "system");
4306}
4307
4308static ssize_t
fd01b88c 4309sync_max_store(struct mddev *mddev, const char *buf, size_t len)
88202a0c
N
4310{
4311 int max;
4312 char *e;
4313 if (strncmp(buf, "system", 6)==0) {
4314 mddev->sync_speed_max = 0;
4315 return len;
4316 }
4317 max = simple_strtoul(buf, &e, 10);
4318 if (buf == e || (*e && *e != '\n') || max <= 0)
4319 return -EINVAL;
4320 mddev->sync_speed_max = max;
4321 return len;
4322}
4323
4324static struct md_sysfs_entry md_sync_max =
4325__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4326
d7f3d291 4327static ssize_t
fd01b88c 4328degraded_show(struct mddev *mddev, char *page)
d7f3d291
IP
4329{
4330 return sprintf(page, "%d\n", mddev->degraded);
4331}
4332static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
88202a0c 4333
90b08710 4334static ssize_t
fd01b88c 4335sync_force_parallel_show(struct mddev *mddev, char *page)
90b08710
BS
4336{
4337 return sprintf(page, "%d\n", mddev->parallel_resync);
4338}
4339
4340static ssize_t
fd01b88c 4341sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
90b08710
BS
4342{
4343 long n;
4344
b29bebd6 4345 if (kstrtol(buf, 10, &n))
90b08710
BS
4346 return -EINVAL;
4347
4348 if (n != 0 && n != 1)
4349 return -EINVAL;
4350
4351 mddev->parallel_resync = n;
4352
4353 if (mddev->sync_thread)
4354 wake_up(&resync_wait);
4355
4356 return len;
4357}
4358
4359/* force parallel resync, even with shared block devices */
4360static struct md_sysfs_entry md_sync_force_parallel =
4361__ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4362 sync_force_parallel_show, sync_force_parallel_store);
4363
88202a0c 4364static ssize_t
fd01b88c 4365sync_speed_show(struct mddev *mddev, char *page)
88202a0c
N
4366{
4367 unsigned long resync, dt, db;
d1a7c503
N
4368 if (mddev->curr_resync == 0)
4369 return sprintf(page, "none\n");
9687a60c
AN
4370 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4371 dt = (jiffies - mddev->resync_mark) / HZ;
88202a0c 4372 if (!dt) dt++;
9687a60c
AN
4373 db = resync - mddev->resync_mark_cnt;
4374 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
88202a0c
N
4375}
4376
80ca3a44 4377static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
88202a0c
N
4378
4379static ssize_t
fd01b88c 4380sync_completed_show(struct mddev *mddev, char *page)
88202a0c 4381{
13ae864b 4382 unsigned long long max_sectors, resync;
88202a0c 4383
acb180b0
N
4384 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4385 return sprintf(page, "none\n");
4386
72f36d59
N
4387 if (mddev->curr_resync == 1 ||
4388 mddev->curr_resync == 2)
4389 return sprintf(page, "delayed\n");
4390
c804cdec
N
4391 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4392 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
58c0fed4 4393 max_sectors = mddev->resync_max_sectors;
88202a0c 4394 else
58c0fed4 4395 max_sectors = mddev->dev_sectors;
88202a0c 4396
acb180b0 4397 resync = mddev->curr_resync_completed;
13ae864b 4398 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
88202a0c
N
4399}
4400
80ca3a44 4401static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
88202a0c 4402
5e96ee65 4403static ssize_t
fd01b88c 4404min_sync_show(struct mddev *mddev, char *page)
5e96ee65
NB
4405{
4406 return sprintf(page, "%llu\n",
4407 (unsigned long long)mddev->resync_min);
4408}
4409static ssize_t
fd01b88c 4410min_sync_store(struct mddev *mddev, const char *buf, size_t len)
5e96ee65
NB
4411{
4412 unsigned long long min;
b29bebd6 4413 if (kstrtoull(buf, 10, &min))
5e96ee65
NB
4414 return -EINVAL;
4415 if (min > mddev->resync_max)
4416 return -EINVAL;
4417 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4418 return -EBUSY;
4419
4420 /* Must be a multiple of chunk_size */
9d8f0363 4421 if (mddev->chunk_sectors) {
2ac06c33 4422 sector_t temp = min;
9d8f0363 4423 if (sector_div(temp, mddev->chunk_sectors))
5e96ee65
NB
4424 return -EINVAL;
4425 }
4426 mddev->resync_min = min;
4427
4428 return len;
4429}
4430
4431static struct md_sysfs_entry md_min_sync =
4432__ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4433
c6207277 4434static ssize_t
fd01b88c 4435max_sync_show(struct mddev *mddev, char *page)
c6207277
N
4436{
4437 if (mddev->resync_max == MaxSector)
4438 return sprintf(page, "max\n");
4439 else
4440 return sprintf(page, "%llu\n",
4441 (unsigned long long)mddev->resync_max);
4442}
4443static ssize_t
fd01b88c 4444max_sync_store(struct mddev *mddev, const char *buf, size_t len)
c6207277
N
4445{
4446 if (strncmp(buf, "max", 3) == 0)
4447 mddev->resync_max = MaxSector;
4448 else {
5e96ee65 4449 unsigned long long max;
b29bebd6 4450 if (kstrtoull(buf, 10, &max))
5e96ee65
NB
4451 return -EINVAL;
4452 if (max < mddev->resync_min)
c6207277
N
4453 return -EINVAL;
4454 if (max < mddev->resync_max &&
4d484a4a 4455 mddev->ro == 0 &&
c6207277
N
4456 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4457 return -EBUSY;
4458
4459 /* Must be a multiple of chunk_size */
9d8f0363 4460 if (mddev->chunk_sectors) {
2ac06c33 4461 sector_t temp = max;
9d8f0363 4462 if (sector_div(temp, mddev->chunk_sectors))
c6207277
N
4463 return -EINVAL;
4464 }
4465 mddev->resync_max = max;
4466 }
4467 wake_up(&mddev->recovery_wait);
4468 return len;
4469}
4470
4471static struct md_sysfs_entry md_max_sync =
4472__ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4473
e464eafd 4474static ssize_t
fd01b88c 4475suspend_lo_show(struct mddev *mddev, char *page)
e464eafd
N
4476{
4477 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4478}
4479
4480static ssize_t
fd01b88c 4481suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
e464eafd
N
4482{
4483 char *e;
4484 unsigned long long new = simple_strtoull(buf, &e, 10);
23ddff37 4485 unsigned long long old = mddev->suspend_lo;
e464eafd 4486
b8d966ef
N
4487 if (mddev->pers == NULL ||
4488 mddev->pers->quiesce == NULL)
e464eafd
N
4489 return -EINVAL;
4490 if (buf == e || (*e && *e != '\n'))
4491 return -EINVAL;
23ddff37
N
4492
4493 mddev->suspend_lo = new;
4494 if (new >= old)
4495 /* Shrinking suspended region */
e464eafd 4496 mddev->pers->quiesce(mddev, 2);
23ddff37
N
4497 else {
4498 /* Expanding suspended region - need to wait */
4499 mddev->pers->quiesce(mddev, 1);
4500 mddev->pers->quiesce(mddev, 0);
4501 }
4502 return len;
e464eafd
N
4503}
4504static struct md_sysfs_entry md_suspend_lo =
4505__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4506
4507
4508static ssize_t
fd01b88c 4509suspend_hi_show(struct mddev *mddev, char *page)
e464eafd
N
4510{
4511 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4512}
4513
4514static ssize_t
fd01b88c 4515suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
e464eafd
N
4516{
4517 char *e;
4518 unsigned long long new = simple_strtoull(buf, &e, 10);
23ddff37 4519 unsigned long long old = mddev->suspend_hi;
e464eafd 4520
b8d966ef
N
4521 if (mddev->pers == NULL ||
4522 mddev->pers->quiesce == NULL)
e464eafd
N
4523 return -EINVAL;
4524 if (buf == e || (*e && *e != '\n'))
4525 return -EINVAL;
23ddff37
N
4526
4527 mddev->suspend_hi = new;
4528 if (new <= old)
4529 /* Shrinking suspended region */
4530 mddev->pers->quiesce(mddev, 2);
4531 else {
4532 /* Expanding suspended region - need to wait */
e464eafd
N
4533 mddev->pers->quiesce(mddev, 1);
4534 mddev->pers->quiesce(mddev, 0);
23ddff37
N
4535 }
4536 return len;
e464eafd
N
4537}
4538static struct md_sysfs_entry md_suspend_hi =
4539__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4540
08a02ecd 4541static ssize_t
fd01b88c 4542reshape_position_show(struct mddev *mddev, char *page)
08a02ecd
N
4543{
4544 if (mddev->reshape_position != MaxSector)
4545 return sprintf(page, "%llu\n",
4546 (unsigned long long)mddev->reshape_position);
4547 strcpy(page, "none\n");
4548 return 5;
4549}
4550
4551static ssize_t
fd01b88c 4552reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
08a02ecd 4553{
c6563a8c 4554 struct md_rdev *rdev;
08a02ecd
N
4555 char *e;
4556 unsigned long long new = simple_strtoull(buf, &e, 10);
4557 if (mddev->pers)
4558 return -EBUSY;
4559 if (buf == e || (*e && *e != '\n'))
4560 return -EINVAL;
4561 mddev->reshape_position = new;
4562 mddev->delta_disks = 0;
2c810cdd 4563 mddev->reshape_backwards = 0;
08a02ecd
N
4564 mddev->new_level = mddev->level;
4565 mddev->new_layout = mddev->layout;
664e7c41 4566 mddev->new_chunk_sectors = mddev->chunk_sectors;
c6563a8c
N
4567 rdev_for_each(rdev, mddev)
4568 rdev->new_data_offset = rdev->data_offset;
08a02ecd
N
4569 return len;
4570}
4571
4572static struct md_sysfs_entry md_reshape_position =
4573__ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4574 reshape_position_store);
4575
2c810cdd
N
4576static ssize_t
4577reshape_direction_show(struct mddev *mddev, char *page)
4578{
4579 return sprintf(page, "%s\n",
4580 mddev->reshape_backwards ? "backwards" : "forwards");
4581}
4582
4583static ssize_t
4584reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4585{
4586 int backwards = 0;
4587 if (cmd_match(buf, "forwards"))
4588 backwards = 0;
4589 else if (cmd_match(buf, "backwards"))
4590 backwards = 1;
4591 else
4592 return -EINVAL;
4593 if (mddev->reshape_backwards == backwards)
4594 return len;
4595
4596 /* check if we are allowed to change */
4597 if (mddev->delta_disks)
4598 return -EBUSY;
4599
4600 if (mddev->persistent &&
4601 mddev->major_version == 0)
4602 return -EINVAL;
4603
4604 mddev->reshape_backwards = backwards;
4605 return len;
4606}
4607
4608static struct md_sysfs_entry md_reshape_direction =
4609__ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4610 reshape_direction_store);
4611
b522adcd 4612static ssize_t
fd01b88c 4613array_size_show(struct mddev *mddev, char *page)
b522adcd
DW
4614{
4615 if (mddev->external_size)
4616 return sprintf(page, "%llu\n",
4617 (unsigned long long)mddev->array_sectors/2);
4618 else
4619 return sprintf(page, "default\n");
4620}
4621
4622static ssize_t
fd01b88c 4623array_size_store(struct mddev *mddev, const char *buf, size_t len)
b522adcd
DW
4624{
4625 sector_t sectors;
4626
4627 if (strncmp(buf, "default", 7) == 0) {
4628 if (mddev->pers)
4629 sectors = mddev->pers->size(mddev, 0, 0);
4630 else
4631 sectors = mddev->array_sectors;
4632
4633 mddev->external_size = 0;
4634 } else {
4635 if (strict_blocks_to_sectors(buf, &sectors) < 0)
4636 return -EINVAL;
4637 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
2b69c839 4638 return -E2BIG;
b522adcd
DW
4639
4640 mddev->external_size = 1;
4641 }
4642
4643 mddev->array_sectors = sectors;
cbe6ef1d
N
4644 if (mddev->pers) {
4645 set_capacity(mddev->gendisk, mddev->array_sectors);
449aad3e 4646 revalidate_disk(mddev->gendisk);
cbe6ef1d 4647 }
b522adcd
DW
4648 return len;
4649}
4650
4651static struct md_sysfs_entry md_array_size =
4652__ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4653 array_size_store);
e464eafd 4654
eae1701f
N
4655static struct attribute *md_default_attrs[] = {
4656 &md_level.attr,
d4dbd025 4657 &md_layout.attr,
eae1701f 4658 &md_raid_disks.attr,
3b34380a 4659 &md_chunk_size.attr,
a35b0d69 4660 &md_size.attr,
a94213b1 4661 &md_resync_start.attr,
8bb93aac 4662 &md_metadata.attr,
6d7ff738 4663 &md_new_device.attr,
16f17b39 4664 &md_safe_delay.attr,
9e653b63 4665 &md_array_state.attr,
08a02ecd 4666 &md_reshape_position.attr,
2c810cdd 4667 &md_reshape_direction.attr,
b522adcd 4668 &md_array_size.attr,
1e50915f 4669 &max_corr_read_errors.attr,
411036fa
N
4670 NULL,
4671};
4672
4673static struct attribute *md_redundancy_attrs[] = {
24dd469d 4674 &md_scan_mode.attr,
c4a39551 4675 &md_last_scan_mode.attr,
9d88883e 4676 &md_mismatches.attr,
88202a0c
N
4677 &md_sync_min.attr,
4678 &md_sync_max.attr,
4679 &md_sync_speed.attr,
90b08710 4680 &md_sync_force_parallel.attr,
88202a0c 4681 &md_sync_completed.attr,
5e96ee65 4682 &md_min_sync.attr,
c6207277 4683 &md_max_sync.attr,
e464eafd
N
4684 &md_suspend_lo.attr,
4685 &md_suspend_hi.attr,
9b1d1dac 4686 &md_bitmap.attr,
d7f3d291 4687 &md_degraded.attr,
eae1701f
N
4688 NULL,
4689};
411036fa
N
4690static struct attribute_group md_redundancy_group = {
4691 .name = NULL,
4692 .attrs = md_redundancy_attrs,
4693};
4694
eae1701f
N
4695
4696static ssize_t
4697md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4698{
4699 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
fd01b88c 4700 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
96de1e66 4701 ssize_t rv;
eae1701f
N
4702
4703 if (!entry->show)
4704 return -EIO;
af8a2434
N
4705 spin_lock(&all_mddevs_lock);
4706 if (list_empty(&mddev->all_mddevs)) {
4707 spin_unlock(&all_mddevs_lock);
4708 return -EBUSY;
4709 }
4710 mddev_get(mddev);
4711 spin_unlock(&all_mddevs_lock);
4712
5dc5cf7d
IM
4713 rv = mddev_lock(mddev);
4714 if (!rv) {
4715 rv = entry->show(mddev, page);
4716 mddev_unlock(mddev);
4717 }
af8a2434 4718 mddev_put(mddev);
96de1e66 4719 return rv;
eae1701f
N
4720}
4721
4722static ssize_t
4723md_attr_store(struct kobject *kobj, struct attribute *attr,
4724 const char *page, size_t length)
4725{
4726 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
fd01b88c 4727 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
96de1e66 4728 ssize_t rv;
eae1701f
N
4729
4730 if (!entry->store)
4731 return -EIO;
67463acb
N
4732 if (!capable(CAP_SYS_ADMIN))
4733 return -EACCES;
af8a2434
N
4734 spin_lock(&all_mddevs_lock);
4735 if (list_empty(&mddev->all_mddevs)) {
4736 spin_unlock(&all_mddevs_lock);
4737 return -EBUSY;
4738 }
4739 mddev_get(mddev);
4740 spin_unlock(&all_mddevs_lock);
a7a3f08d
N
4741 if (entry->store == new_dev_store)
4742 flush_workqueue(md_misc_wq);
5dc5cf7d
IM
4743 rv = mddev_lock(mddev);
4744 if (!rv) {
4745 rv = entry->store(mddev, page, length);
4746 mddev_unlock(mddev);
4747 }
af8a2434 4748 mddev_put(mddev);
96de1e66 4749 return rv;
eae1701f
N
4750}
4751
4752static void md_free(struct kobject *ko)
4753{
fd01b88c 4754 struct mddev *mddev = container_of(ko, struct mddev, kobj);
a21d1504
N
4755
4756 if (mddev->sysfs_state)
4757 sysfs_put(mddev->sysfs_state);
4758
4759 if (mddev->gendisk) {
4760 del_gendisk(mddev->gendisk);
4761 put_disk(mddev->gendisk);
4762 }
4763 if (mddev->queue)
4764 blk_cleanup_queue(mddev->queue);
4765
eae1701f
N
4766 kfree(mddev);
4767}
4768
52cf25d0 4769static const struct sysfs_ops md_sysfs_ops = {
eae1701f
N
4770 .show = md_attr_show,
4771 .store = md_attr_store,
4772};
4773static struct kobj_type md_ktype = {
4774 .release = md_free,
4775 .sysfs_ops = &md_sysfs_ops,
4776 .default_attrs = md_default_attrs,
4777};
4778
1da177e4
LT
4779int mdp_major = 0;
4780
5fd3a17e
DW
4781static void mddev_delayed_delete(struct work_struct *ws)
4782{
fd01b88c 4783 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5fd3a17e 4784
43a70507 4785 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
5fd3a17e
DW
4786 kobject_del(&mddev->kobj);
4787 kobject_put(&mddev->kobj);
4788}
4789
efeb53c0 4790static int md_alloc(dev_t dev, char *name)
1da177e4 4791{
48c9c27b 4792 static DEFINE_MUTEX(disks_mutex);
fd01b88c 4793 struct mddev *mddev = mddev_find(dev);
1da177e4 4794 struct gendisk *disk;
efeb53c0
N
4795 int partitioned;
4796 int shift;
4797 int unit;
3830c62f 4798 int error;
1da177e4
LT
4799
4800 if (!mddev)
efeb53c0
N
4801 return -ENODEV;
4802
4803 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4804 shift = partitioned ? MdpMinorShift : 0;
4805 unit = MINOR(mddev->unit) >> shift;
1da177e4 4806
e804ac78
TH
4807 /* wait for any previous instance of this device to be
4808 * completely removed (mddev_delayed_delete).
d3374825 4809 */
e804ac78 4810 flush_workqueue(md_misc_wq);
d3374825 4811
48c9c27b 4812 mutex_lock(&disks_mutex);
0909dc44
N
4813 error = -EEXIST;
4814 if (mddev->gendisk)
4815 goto abort;
efeb53c0
N
4816
4817 if (name) {
4818 /* Need to ensure that 'name' is not a duplicate.
4819 */
fd01b88c 4820 struct mddev *mddev2;
efeb53c0
N
4821 spin_lock(&all_mddevs_lock);
4822
4823 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4824 if (mddev2->gendisk &&
4825 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4826 spin_unlock(&all_mddevs_lock);
0909dc44 4827 goto abort;
efeb53c0
N
4828 }
4829 spin_unlock(&all_mddevs_lock);
1da177e4 4830 }
8b765398 4831
0909dc44 4832 error = -ENOMEM;
8b765398 4833 mddev->queue = blk_alloc_queue(GFP_KERNEL);
0909dc44
N
4834 if (!mddev->queue)
4835 goto abort;
409c57f3
N
4836 mddev->queue->queuedata = mddev;
4837
409c57f3 4838 blk_queue_make_request(mddev->queue, md_make_request);
b1bd055d 4839 blk_set_stacking_limits(&mddev->queue->limits);
8b765398 4840
1da177e4
LT
4841 disk = alloc_disk(1 << shift);
4842 if (!disk) {
8b765398
N
4843 blk_cleanup_queue(mddev->queue);
4844 mddev->queue = NULL;
0909dc44 4845 goto abort;
1da177e4 4846 }
efeb53c0 4847 disk->major = MAJOR(mddev->unit);
1da177e4 4848 disk->first_minor = unit << shift;
efeb53c0
N
4849 if (name)
4850 strcpy(disk->disk_name, name);
4851 else if (partitioned)
1da177e4 4852 sprintf(disk->disk_name, "md_d%d", unit);
ce7b0f46 4853 else
1da177e4 4854 sprintf(disk->disk_name, "md%d", unit);
1da177e4
LT
4855 disk->fops = &md_fops;
4856 disk->private_data = mddev;
4857 disk->queue = mddev->queue;
b0140891 4858 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
92850bbd 4859 /* Allow extended partitions. This makes the
d3374825 4860 * 'mdp' device redundant, but we can't really
92850bbd
N
4861 * remove it now.
4862 */
4863 disk->flags |= GENHD_FL_EXT_DEVT;
1da177e4 4864 mddev->gendisk = disk;
b0140891
N
4865 /* As soon as we call add_disk(), another thread could get
4866 * through to md_open, so make sure it doesn't get too far
4867 */
4868 mutex_lock(&mddev->open_mutex);
4869 add_disk(disk);
4870
ed9e1982
TH
4871 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4872 &disk_to_dev(disk)->kobj, "%s", "md");
0909dc44
N
4873 if (error) {
4874 /* This isn't possible, but as kobject_init_and_add is marked
4875 * __must_check, we must do something with the result
4876 */
5e55e2f5
N
4877 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4878 disk->disk_name);
0909dc44
N
4879 error = 0;
4880 }
00bcb4ac
N
4881 if (mddev->kobj.sd &&
4882 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
43a70507 4883 printk(KERN_DEBUG "pointless warning\n");
b0140891 4884 mutex_unlock(&mddev->open_mutex);
0909dc44
N
4885 abort:
4886 mutex_unlock(&disks_mutex);
00bcb4ac 4887 if (!error && mddev->kobj.sd) {
3830c62f 4888 kobject_uevent(&mddev->kobj, KOBJ_ADD);
00bcb4ac 4889 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
b62b7590 4890 }
d3374825 4891 mddev_put(mddev);
0909dc44 4892 return error;
efeb53c0
N
4893}
4894
4895static struct kobject *md_probe(dev_t dev, int *part, void *data)
4896{
4897 md_alloc(dev, NULL);
1da177e4
LT
4898 return NULL;
4899}
4900
efeb53c0
N
4901static int add_named_array(const char *val, struct kernel_param *kp)
4902{
4903 /* val must be "md_*" where * is not all digits.
4904 * We allocate an array with a large free minor number, and
4905 * set the name to val. val must not already be an active name.
4906 */
4907 int len = strlen(val);
4908 char buf[DISK_NAME_LEN];
4909
4910 while (len && val[len-1] == '\n')
4911 len--;
4912 if (len >= DISK_NAME_LEN)
4913 return -E2BIG;
4914 strlcpy(buf, val, len+1);
4915 if (strncmp(buf, "md_", 3) != 0)
4916 return -EINVAL;
4917 return md_alloc(0, buf);
4918}
4919
1da177e4
LT
4920static void md_safemode_timeout(unsigned long data)
4921{
fd01b88c 4922 struct mddev *mddev = (struct mddev *) data;
1da177e4 4923
0fd62b86
NB
4924 if (!atomic_read(&mddev->writes_pending)) {
4925 mddev->safemode = 1;
4926 if (mddev->external)
00bcb4ac 4927 sysfs_notify_dirent_safe(mddev->sysfs_state);
0fd62b86 4928 }
1da177e4
LT
4929 md_wakeup_thread(mddev->thread);
4930}
4931
6ff8d8ec 4932static int start_dirty_degraded;
1da177e4 4933
fd01b88c 4934int md_run(struct mddev *mddev)
1da177e4 4935{
2604b703 4936 int err;
3cb03002 4937 struct md_rdev *rdev;
84fc4b56 4938 struct md_personality *pers;
1da177e4 4939
a757e64c
N
4940 if (list_empty(&mddev->disks))
4941 /* cannot run an array with no devices.. */
1da177e4 4942 return -EINVAL;
1da177e4
LT
4943
4944 if (mddev->pers)
4945 return -EBUSY;
bb4f1e9d
N
4946 /* Cannot run until previous stop completes properly */
4947 if (mddev->sysfs_active)
4948 return -EBUSY;
b6eb127d 4949
1da177e4
LT
4950 /*
4951 * Analyze all RAID superblock(s)
4952 */
1ec4a939
N
4953 if (!mddev->raid_disks) {
4954 if (!mddev->persistent)
4955 return -EINVAL;
a757e64c 4956 analyze_sbs(mddev);
1ec4a939 4957 }
1da177e4 4958
d9d166c2
N
4959 if (mddev->level != LEVEL_NONE)
4960 request_module("md-level-%d", mddev->level);
4961 else if (mddev->clevel[0])
4962 request_module("md-%s", mddev->clevel);
1da177e4
LT
4963
4964 /*
4965 * Drop all container device buffers, from now on
4966 * the only valid external interface is through the md
4967 * device.
1da177e4 4968 */
dafb20fa 4969 rdev_for_each(rdev, mddev) {
b2d444d7 4970 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT
4971 continue;
4972 sync_blockdev(rdev->bdev);
f98393a6 4973 invalidate_bdev(rdev->bdev);
f0d76d70
N
4974
4975 /* perform some consistency tests on the device.
4976 * We don't want the data to overlap the metadata,
58c0fed4 4977 * Internal Bitmap issues have been handled elsewhere.
f0d76d70 4978 */
a6ff7e08
JB
4979 if (rdev->meta_bdev) {
4980 /* Nothing to check */;
4981 } else if (rdev->data_offset < rdev->sb_start) {
58c0fed4
AN
4982 if (mddev->dev_sectors &&
4983 rdev->data_offset + mddev->dev_sectors
0f420358 4984 > rdev->sb_start) {
f0d76d70
N
4985 printk("md: %s: data overlaps metadata\n",
4986 mdname(mddev));
4987 return -EINVAL;
4988 }
4989 } else {
0f420358 4990 if (rdev->sb_start + rdev->sb_size/512
f0d76d70
N
4991 > rdev->data_offset) {
4992 printk("md: %s: metadata overlaps data\n",
4993 mdname(mddev));
4994 return -EINVAL;
4995 }
4996 }
00bcb4ac 4997 sysfs_notify_dirent_safe(rdev->sysfs_state);
1da177e4
LT
4998 }
4999
a167f663 5000 if (mddev->bio_set == NULL)
395c72a7 5001 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
a167f663 5002
1da177e4 5003 spin_lock(&pers_lock);
d9d166c2 5004 pers = find_pers(mddev->level, mddev->clevel);
2604b703 5005 if (!pers || !try_module_get(pers->owner)) {
1da177e4 5006 spin_unlock(&pers_lock);
d9d166c2
N
5007 if (mddev->level != LEVEL_NONE)
5008 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
5009 mddev->level);
5010 else
5011 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
5012 mddev->clevel);
1da177e4
LT
5013 return -EINVAL;
5014 }
2604b703 5015 mddev->pers = pers;
1da177e4 5016 spin_unlock(&pers_lock);
34817e8c
N
5017 if (mddev->level != pers->level) {
5018 mddev->level = pers->level;
5019 mddev->new_level = pers->level;
5020 }
d9d166c2 5021 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
1da177e4 5022
f6705578 5023 if (mddev->reshape_position != MaxSector &&
63c70c4f 5024 pers->start_reshape == NULL) {
f6705578
N
5025 /* This personality cannot handle reshaping... */
5026 mddev->pers = NULL;
5027 module_put(pers->owner);
5028 return -EINVAL;
5029 }
5030
7dd5e7c3
N
5031 if (pers->sync_request) {
5032 /* Warn if this is a potentially silly
5033 * configuration.
5034 */
5035 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3cb03002 5036 struct md_rdev *rdev2;
7dd5e7c3 5037 int warned = 0;
159ec1fc 5038
dafb20fa
N
5039 rdev_for_each(rdev, mddev)
5040 rdev_for_each(rdev2, mddev) {
7dd5e7c3
N
5041 if (rdev < rdev2 &&
5042 rdev->bdev->bd_contains ==
5043 rdev2->bdev->bd_contains) {
5044 printk(KERN_WARNING
5045 "%s: WARNING: %s appears to be"
5046 " on the same physical disk as"
5047 " %s.\n",
5048 mdname(mddev),
5049 bdevname(rdev->bdev,b),
5050 bdevname(rdev2->bdev,b2));
5051 warned = 1;
5052 }
5053 }
159ec1fc 5054
7dd5e7c3
N
5055 if (warned)
5056 printk(KERN_WARNING
5057 "True protection against single-disk"
5058 " failure might be compromised.\n");
5059 }
5060
657390d2 5061 mddev->recovery = 0;
58c0fed4
AN
5062 /* may be over-ridden by personality */
5063 mddev->resync_max_sectors = mddev->dev_sectors;
5064
6ff8d8ec 5065 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 5066
0f9552b5 5067 if (start_readonly && mddev->ro == 0)
f91de92e
N
5068 mddev->ro = 2; /* read-only, but switch on first write */
5069
b15c2e57 5070 err = mddev->pers->run(mddev);
13e53df3
AN
5071 if (err)
5072 printk(KERN_ERR "md: pers->run() failed ...\n");
b522adcd
DW
5073 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
5074 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
5075 " but 'external_size' not in effect?\n", __func__);
5076 printk(KERN_ERR
5077 "md: invalid array_size %llu > default size %llu\n",
5078 (unsigned long long)mddev->array_sectors / 2,
5079 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
5080 err = -EINVAL;
5081 mddev->pers->stop(mddev);
5082 }
ef99bf48
N
5083 if (err == 0 && mddev->pers->sync_request &&
5084 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
b15c2e57
N
5085 err = bitmap_create(mddev);
5086 if (err) {
5087 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
5088 mdname(mddev), err);
5089 mddev->pers->stop(mddev);
5090 }
5091 }
1da177e4 5092 if (err) {
1da177e4
LT
5093 module_put(mddev->pers->owner);
5094 mddev->pers = NULL;
32a7627c
N
5095 bitmap_destroy(mddev);
5096 return err;
1da177e4 5097 }
5e55e2f5 5098 if (mddev->pers->sync_request) {
00bcb4ac
N
5099 if (mddev->kobj.sd &&
5100 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5e55e2f5
N
5101 printk(KERN_WARNING
5102 "md: cannot register extra attributes for %s\n",
5103 mdname(mddev));
00bcb4ac 5104 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5e55e2f5 5105 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
fd9d49ca
N
5106 mddev->ro = 0;
5107
1da177e4 5108 atomic_set(&mddev->writes_pending,0);
1e50915f
RB
5109 atomic_set(&mddev->max_corr_read_errors,
5110 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
1da177e4
LT
5111 mddev->safemode = 0;
5112 mddev->safemode_timer.function = md_safemode_timeout;
5113 mddev->safemode_timer.data = (unsigned long) mddev;
16f17b39 5114 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
1da177e4 5115 mddev->in_sync = 1;
0ca69886
N
5116 smp_wmb();
5117 mddev->ready = 1;
dafb20fa 5118 rdev_for_each(rdev, mddev)
36fad858
NK
5119 if (rdev->raid_disk >= 0)
5120 if (sysfs_link_rdev(mddev, rdev))
00bcb4ac 5121 /* failure here is OK */;
1da177e4
LT
5122
5123 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5124
7a0a5355 5125 if (mddev->flags & MD_UPDATE_SB_FLAGS)
850b2b42 5126 md_update_sb(mddev, 0);
1da177e4 5127
d7603b7e 5128 md_new_event(mddev);
00bcb4ac
N
5129 sysfs_notify_dirent_safe(mddev->sysfs_state);
5130 sysfs_notify_dirent_safe(mddev->sysfs_action);
a99ac971 5131 sysfs_notify(&mddev->kobj, NULL, "degraded");
1da177e4
LT
5132 return 0;
5133}
390ee602 5134EXPORT_SYMBOL_GPL(md_run);
1da177e4 5135
fd01b88c 5136static int do_md_run(struct mddev *mddev)
fe60b014
N
5137{
5138 int err;
5139
5140 err = md_run(mddev);
5141 if (err)
5142 goto out;
69e51b44
N
5143 err = bitmap_load(mddev);
5144 if (err) {
5145 bitmap_destroy(mddev);
5146 goto out;
5147 }
0fd018af
JB
5148
5149 md_wakeup_thread(mddev->thread);
5150 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5151
fe60b014
N
5152 set_capacity(mddev->gendisk, mddev->array_sectors);
5153 revalidate_disk(mddev->gendisk);
f0b4f7e2 5154 mddev->changed = 1;
fe60b014
N
5155 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5156out:
5157 return err;
5158}
5159
fd01b88c 5160static int restart_array(struct mddev *mddev)
1da177e4
LT
5161{
5162 struct gendisk *disk = mddev->gendisk;
1da177e4 5163
80fab1d7 5164 /* Complain if it has no devices */
1da177e4 5165 if (list_empty(&mddev->disks))
80fab1d7
AN
5166 return -ENXIO;
5167 if (!mddev->pers)
5168 return -EINVAL;
5169 if (!mddev->ro)
5170 return -EBUSY;
5171 mddev->safemode = 0;
5172 mddev->ro = 0;
5173 set_disk_ro(disk, 0);
5174 printk(KERN_INFO "md: %s switched to read-write mode.\n",
5175 mdname(mddev));
5176 /* Kick recovery or resync if necessary */
5177 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5178 md_wakeup_thread(mddev->thread);
5179 md_wakeup_thread(mddev->sync_thread);
00bcb4ac 5180 sysfs_notify_dirent_safe(mddev->sysfs_state);
80fab1d7 5181 return 0;
1da177e4
LT
5182}
5183
acc55e22
N
5184/* similar to deny_write_access, but accounts for our holding a reference
5185 * to the file ourselves */
5186static int deny_bitmap_write_access(struct file * file)
5187{
5188 struct inode *inode = file->f_mapping->host;
5189
5190 spin_lock(&inode->i_lock);
5191 if (atomic_read(&inode->i_writecount) > 1) {
5192 spin_unlock(&inode->i_lock);
5193 return -ETXTBSY;
5194 }
5195 atomic_set(&inode->i_writecount, -1);
5196 spin_unlock(&inode->i_lock);
5197
5198 return 0;
5199}
5200
43a70507 5201void restore_bitmap_write_access(struct file *file)
acc55e22
N
5202{
5203 struct inode *inode = file->f_mapping->host;
5204
5205 spin_lock(&inode->i_lock);
5206 atomic_set(&inode->i_writecount, 1);
5207 spin_unlock(&inode->i_lock);
5208}
5209
fd01b88c 5210static void md_clean(struct mddev *mddev)
6177b472
N
5211{
5212 mddev->array_sectors = 0;
5213 mddev->external_size = 0;
5214 mddev->dev_sectors = 0;
5215 mddev->raid_disks = 0;
5216 mddev->recovery_cp = 0;
5217 mddev->resync_min = 0;
5218 mddev->resync_max = MaxSector;
5219 mddev->reshape_position = MaxSector;
5220 mddev->external = 0;
5221 mddev->persistent = 0;
5222 mddev->level = LEVEL_NONE;
5223 mddev->clevel[0] = 0;
5224 mddev->flags = 0;
5225 mddev->ro = 0;
5226 mddev->metadata_type[0] = 0;
5227 mddev->chunk_sectors = 0;
5228 mddev->ctime = mddev->utime = 0;
5229 mddev->layout = 0;
5230 mddev->max_disks = 0;
5231 mddev->events = 0;
a8707c08 5232 mddev->can_decrease_events = 0;
6177b472 5233 mddev->delta_disks = 0;
2c810cdd 5234 mddev->reshape_backwards = 0;
6177b472
N
5235 mddev->new_level = LEVEL_NONE;
5236 mddev->new_layout = 0;
5237 mddev->new_chunk_sectors = 0;
5238 mddev->curr_resync = 0;
7f7583d4 5239 atomic64_set(&mddev->resync_mismatches, 0);
6177b472
N
5240 mddev->suspend_lo = mddev->suspend_hi = 0;
5241 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5242 mddev->recovery = 0;
5243 mddev->in_sync = 0;
f0b4f7e2 5244 mddev->changed = 0;
6177b472 5245 mddev->degraded = 0;
6177b472 5246 mddev->safemode = 0;
050b6615 5247 mddev->merge_check_needed = 0;
6177b472
N
5248 mddev->bitmap_info.offset = 0;
5249 mddev->bitmap_info.default_offset = 0;
6409bb05 5250 mddev->bitmap_info.default_space = 0;
6177b472
N
5251 mddev->bitmap_info.chunksize = 0;
5252 mddev->bitmap_info.daemon_sleep = 0;
5253 mddev->bitmap_info.max_write_behind = 0;
5254}
5255
fd01b88c 5256static void __md_stop_writes(struct mddev *mddev)
a047e125 5257{
6b6204ee 5258 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
a047e125 5259 if (mddev->sync_thread) {
a047e125 5260 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
a91d5ac0 5261 md_reap_sync_thread(mddev);
a047e125
N
5262 }
5263
5264 del_timer_sync(&mddev->safemode_timer);
5265
5266 bitmap_flush(mddev);
5267 md_super_wait(mddev);
5268
b6d428c6 5269 if (mddev->ro == 0 &&
7a0a5355 5270 (!mddev->in_sync || (mddev->flags & MD_UPDATE_SB_FLAGS))) {
a047e125
N
5271 /* mark array as shutdown cleanly */
5272 mddev->in_sync = 1;
5273 md_update_sb(mddev, 1);
5274 }
5275}
defad61a 5276
fd01b88c 5277void md_stop_writes(struct mddev *mddev)
defad61a 5278{
29f097c4 5279 mddev_lock_nointr(mddev);
defad61a
N
5280 __md_stop_writes(mddev);
5281 mddev_unlock(mddev);
5282}
390ee602 5283EXPORT_SYMBOL_GPL(md_stop_writes);
a047e125 5284
5eff3c43 5285static void __md_stop(struct mddev *mddev)
6177b472 5286{
0ca69886 5287 mddev->ready = 0;
6177b472
N
5288 mddev->pers->stop(mddev);
5289 if (mddev->pers->sync_request && mddev->to_remove == NULL)
5290 mddev->to_remove = &md_redundancy_group;
5291 module_put(mddev->pers->owner);
5292 mddev->pers = NULL;
cca9cf90 5293 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6177b472 5294}
5eff3c43
N
5295
5296void md_stop(struct mddev *mddev)
5297{
5298 /* stop the array and free an attached data structures.
5299 * This is called from dm-raid
5300 */
5301 __md_stop(mddev);
5302 bitmap_destroy(mddev);
5303 if (mddev->bio_set)
5304 bioset_free(mddev->bio_set);
5305}
5306
390ee602 5307EXPORT_SYMBOL_GPL(md_stop);
6177b472 5308
a05b7ea0 5309static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
a4bd82d0
N
5310{
5311 int err = 0;
30b8feb7
N
5312 int did_freeze = 0;
5313
5314 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5315 did_freeze = 1;
5316 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5317 md_wakeup_thread(mddev->thread);
5318 }
5319 if (mddev->sync_thread) {
5320 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5321 /* Thread might be blocked waiting for metadata update
5322 * which will now never happen */
5323 wake_up_process(mddev->sync_thread->tsk);
5324 }
5325 mddev_unlock(mddev);
5326 wait_event(resync_wait, mddev->sync_thread == NULL);
5327 mddev_lock_nointr(mddev);
5328
a4bd82d0 5329 mutex_lock(&mddev->open_mutex);
30b8feb7
N
5330 if (atomic_read(&mddev->openers) > !!bdev ||
5331 mddev->sync_thread ||
5332 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
a4bd82d0 5333 printk("md: %s still in use.\n",mdname(mddev));
30b8feb7
N
5334 if (did_freeze) {
5335 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5336 md_wakeup_thread(mddev->thread);
5337 }
a4bd82d0
N
5338 err = -EBUSY;
5339 goto out;
5340 }
5341 if (mddev->pers) {
defad61a 5342 __md_stop_writes(mddev);
a4bd82d0
N
5343
5344 err = -ENXIO;
5345 if (mddev->ro==1)
5346 goto out;
5347 mddev->ro = 1;
5348 set_disk_ro(mddev->gendisk, 1);
5349 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
00bcb4ac 5350 sysfs_notify_dirent_safe(mddev->sysfs_state);
30b8feb7 5351 err = 0;
a4bd82d0
N
5352 }
5353out:
5354 mutex_unlock(&mddev->open_mutex);
5355 return err;
5356}
5357
9e653b63
N
5358/* mode:
5359 * 0 - completely stop and dis-assemble array
9e653b63
N
5360 * 2 - stop but do not disassemble array
5361 */
a05b7ea0
N
5362static int do_md_stop(struct mddev * mddev, int mode,
5363 struct block_device *bdev)
1da177e4 5364{
1da177e4 5365 struct gendisk *disk = mddev->gendisk;
3cb03002 5366 struct md_rdev *rdev;
30b8feb7
N
5367 int did_freeze = 0;
5368
5369 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5370 did_freeze = 1;
5371 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5372 md_wakeup_thread(mddev->thread);
5373 }
5374 if (mddev->sync_thread) {
5375 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5376 /* Thread might be blocked waiting for metadata update
5377 * which will now never happen */
5378 wake_up_process(mddev->sync_thread->tsk);
5379 }
5380 mddev_unlock(mddev);
5381 wait_event(resync_wait, mddev->sync_thread == NULL);
5382 mddev_lock_nointr(mddev);
1da177e4 5383
c8c00a69 5384 mutex_lock(&mddev->open_mutex);
a05b7ea0 5385 if (atomic_read(&mddev->openers) > !!bdev ||
30b8feb7
N
5386 mddev->sysfs_active ||
5387 mddev->sync_thread ||
5388 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
df5b20cf 5389 printk("md: %s still in use.\n",mdname(mddev));
6e17b027 5390 mutex_unlock(&mddev->open_mutex);
30b8feb7
N
5391 if (did_freeze) {
5392 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5393 md_wakeup_thread(mddev->thread);
5394 }
260fa034
N
5395 return -EBUSY;
5396 }
6e17b027 5397 if (mddev->pers) {
a4bd82d0
N
5398 if (mddev->ro)
5399 set_disk_ro(disk, 0);
409c57f3 5400
defad61a 5401 __md_stop_writes(mddev);
5eff3c43 5402 __md_stop(mddev);
a4bd82d0 5403 mddev->queue->merge_bvec_fn = NULL;
a4bd82d0 5404 mddev->queue->backing_dev_info.congested_fn = NULL;
6177b472 5405
a4bd82d0 5406 /* tell userspace to handle 'inactive' */
00bcb4ac 5407 sysfs_notify_dirent_safe(mddev->sysfs_state);
0d4ca600 5408
dafb20fa 5409 rdev_for_each(rdev, mddev)
36fad858
NK
5410 if (rdev->raid_disk >= 0)
5411 sysfs_unlink_rdev(mddev, rdev);
c4647292 5412
a4bd82d0 5413 set_capacity(disk, 0);
6e17b027 5414 mutex_unlock(&mddev->open_mutex);
f0b4f7e2 5415 mddev->changed = 1;
a4bd82d0 5416 revalidate_disk(disk);
0d4ca600 5417
a4bd82d0
N
5418 if (mddev->ro)
5419 mddev->ro = 0;
6e17b027
N
5420 } else
5421 mutex_unlock(&mddev->open_mutex);
1da177e4
LT
5422 /*
5423 * Free resources if final stop
5424 */
9e653b63 5425 if (mode == 0) {
1da177e4
LT
5426 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
5427
978f946b 5428 bitmap_destroy(mddev);
c3d9714e
N
5429 if (mddev->bitmap_info.file) {
5430 restore_bitmap_write_access(mddev->bitmap_info.file);
5431 fput(mddev->bitmap_info.file);
5432 mddev->bitmap_info.file = NULL;
978f946b 5433 }
c3d9714e 5434 mddev->bitmap_info.offset = 0;
978f946b 5435
1da177e4
LT
5436 export_array(mddev);
5437
6177b472 5438 md_clean(mddev);
934d9c23 5439 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
efeb53c0
N
5440 if (mddev->hold_active == UNTIL_STOP)
5441 mddev->hold_active = 0;
a4bd82d0 5442 }
3f9d99c1 5443 blk_integrity_unregister(disk);
d7603b7e 5444 md_new_event(mddev);
00bcb4ac 5445 sysfs_notify_dirent_safe(mddev->sysfs_state);
6e17b027 5446 return 0;
1da177e4
LT
5447}
5448
fdee8ae4 5449#ifndef MODULE
fd01b88c 5450static void autorun_array(struct mddev *mddev)
1da177e4 5451{
3cb03002 5452 struct md_rdev *rdev;
1da177e4
LT
5453 int err;
5454
a757e64c 5455 if (list_empty(&mddev->disks))
1da177e4 5456 return;
1da177e4
LT
5457
5458 printk(KERN_INFO "md: running: ");
5459
dafb20fa 5460 rdev_for_each(rdev, mddev) {
1da177e4
LT
5461 char b[BDEVNAME_SIZE];
5462 printk("<%s>", bdevname(rdev->bdev,b));
5463 }
5464 printk("\n");
5465
d710e138 5466 err = do_md_run(mddev);
1da177e4
LT
5467 if (err) {
5468 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
a05b7ea0 5469 do_md_stop(mddev, 0, NULL);
1da177e4
LT
5470 }
5471}
5472
5473/*
5474 * lets try to run arrays based on all disks that have arrived
5475 * until now. (those are in pending_raid_disks)
5476 *
5477 * the method: pick the first pending disk, collect all disks with
5478 * the same UUID, remove all from the pending list and put them into
5479 * the 'same_array' list. Then order this list based on superblock
5480 * update time (freshest comes first), kick out 'old' disks and
5481 * compare superblocks. If everything's fine then run it.
5482 *
5483 * If "unit" is allocated, then bump its reference count
5484 */
5485static void autorun_devices(int part)
5486{
3cb03002 5487 struct md_rdev *rdev0, *rdev, *tmp;
fd01b88c 5488 struct mddev *mddev;
1da177e4
LT
5489 char b[BDEVNAME_SIZE];
5490
5491 printk(KERN_INFO "md: autorun ...\n");
5492 while (!list_empty(&pending_raid_disks)) {
e8703fe1 5493 int unit;
1da177e4 5494 dev_t dev;
ad01c9e3 5495 LIST_HEAD(candidates);
1da177e4 5496 rdev0 = list_entry(pending_raid_disks.next,
3cb03002 5497 struct md_rdev, same_set);
1da177e4
LT
5498
5499 printk(KERN_INFO "md: considering %s ...\n",
5500 bdevname(rdev0->bdev,b));
5501 INIT_LIST_HEAD(&candidates);
159ec1fc 5502 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
1da177e4
LT
5503 if (super_90_load(rdev, rdev0, 0) >= 0) {
5504 printk(KERN_INFO "md: adding %s ...\n",
5505 bdevname(rdev->bdev,b));
5506 list_move(&rdev->same_set, &candidates);
5507 }
5508 /*
5509 * now we have a set of devices, with all of them having
5510 * mostly sane superblocks. It's time to allocate the
5511 * mddev.
5512 */
e8703fe1
N
5513 if (part) {
5514 dev = MKDEV(mdp_major,
5515 rdev0->preferred_minor << MdpMinorShift);
5516 unit = MINOR(dev) >> MdpMinorShift;
5517 } else {
5518 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5519 unit = MINOR(dev);
5520 }
5521 if (rdev0->preferred_minor != unit) {
1da177e4
LT
5522 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
5523 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5524 break;
5525 }
1da177e4
LT
5526
5527 md_probe(dev, NULL, NULL);
5528 mddev = mddev_find(dev);
9bbbca3a
NB
5529 if (!mddev || !mddev->gendisk) {
5530 if (mddev)
5531 mddev_put(mddev);
5532 printk(KERN_ERR
1da177e4
LT
5533 "md: cannot allocate memory for md drive.\n");
5534 break;
5535 }
5536 if (mddev_lock(mddev))
5537 printk(KERN_WARNING "md: %s locked, cannot run\n",
5538 mdname(mddev));
5539 else if (mddev->raid_disks || mddev->major_version
5540 || !list_empty(&mddev->disks)) {
5541 printk(KERN_WARNING
5542 "md: %s already running, cannot run %s\n",
5543 mdname(mddev), bdevname(rdev0->bdev,b));
5544 mddev_unlock(mddev);
5545 } else {
5546 printk(KERN_INFO "md: created %s\n", mdname(mddev));
1ec4a939 5547 mddev->persistent = 1;
159ec1fc 5548 rdev_for_each_list(rdev, tmp, &candidates) {
1da177e4
LT
5549 list_del_init(&rdev->same_set);
5550 if (bind_rdev_to_array(rdev, mddev))
5551 export_rdev(rdev);
5552 }
5553 autorun_array(mddev);
5554 mddev_unlock(mddev);
5555 }
5556 /* on success, candidates will be empty, on error
5557 * it won't...
5558 */
159ec1fc 5559 rdev_for_each_list(rdev, tmp, &candidates) {
4b80991c 5560 list_del_init(&rdev->same_set);
1da177e4 5561 export_rdev(rdev);
4b80991c 5562 }
1da177e4
LT
5563 mddev_put(mddev);
5564 }
5565 printk(KERN_INFO "md: ... autorun DONE.\n");
5566}
fdee8ae4 5567#endif /* !MODULE */
1da177e4 5568
1da177e4
LT
5569static int get_version(void __user * arg)
5570{
5571 mdu_version_t ver;
5572
5573 ver.major = MD_MAJOR_VERSION;
5574 ver.minor = MD_MINOR_VERSION;
5575 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5576
5577 if (copy_to_user(arg, &ver, sizeof(ver)))
5578 return -EFAULT;
5579
5580 return 0;
5581}
5582
fd01b88c 5583static int get_array_info(struct mddev * mddev, void __user * arg)
1da177e4
LT
5584{
5585 mdu_array_info_t info;
a9f326eb 5586 int nr,working,insync,failed,spare;
3cb03002 5587 struct md_rdev *rdev;
1da177e4 5588
1ca69c4b
N
5589 nr = working = insync = failed = spare = 0;
5590 rcu_read_lock();
5591 rdev_for_each_rcu(rdev, mddev) {
1da177e4 5592 nr++;
b2d444d7 5593 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT
5594 failed++;
5595 else {
5596 working++;
b2d444d7 5597 if (test_bit(In_sync, &rdev->flags))
a9f326eb 5598 insync++;
1da177e4
LT
5599 else
5600 spare++;
5601 }
5602 }
1ca69c4b 5603 rcu_read_unlock();
1da177e4
LT
5604
5605 info.major_version = mddev->major_version;
5606 info.minor_version = mddev->minor_version;
5607 info.patch_version = MD_PATCHLEVEL_VERSION;
5608 info.ctime = mddev->ctime;
5609 info.level = mddev->level;
58c0fed4
AN
5610 info.size = mddev->dev_sectors / 2;
5611 if (info.size != mddev->dev_sectors / 2) /* overflow */
284ae7ca 5612 info.size = -1;
1da177e4
LT
5613 info.nr_disks = nr;
5614 info.raid_disks = mddev->raid_disks;
5615 info.md_minor = mddev->md_minor;
5616 info.not_persistent= !mddev->persistent;
5617
5618 info.utime = mddev->utime;
5619 info.state = 0;
5620 if (mddev->in_sync)
5621 info.state = (1<<MD_SB_CLEAN);
c3d9714e 5622 if (mddev->bitmap && mddev->bitmap_info.offset)
36fa3063 5623 info.state = (1<<MD_SB_BITMAP_PRESENT);
a9f326eb 5624 info.active_disks = insync;
1da177e4
LT
5625 info.working_disks = working;
5626 info.failed_disks = failed;
5627 info.spare_disks = spare;
5628
5629 info.layout = mddev->layout;
9d8f0363 5630 info.chunk_size = mddev->chunk_sectors << 9;
1da177e4
LT
5631
5632 if (copy_to_user(arg, &info, sizeof(info)))
5633 return -EFAULT;
5634
5635 return 0;
5636}
5637
fd01b88c 5638static int get_bitmap_file(struct mddev * mddev, void __user * arg)
32a7627c
N
5639{
5640 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5641 char *ptr, *buf = NULL;
5642 int err = -ENOMEM;
5643
60559da4 5644 file = kmalloc(sizeof(*file), GFP_NOIO);
2a2275d6 5645
32a7627c
N
5646 if (!file)
5647 goto out;
5648
5649 /* bitmap disabled, zero the first byte and copy out */
1ec885cd 5650 if (!mddev->bitmap || !mddev->bitmap->storage.file) {
32a7627c
N
5651 file->pathname[0] = '\0';
5652 goto copy_out;
5653 }
5654
5655 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
5656 if (!buf)
5657 goto out;
5658
1ec885cd
N
5659 ptr = d_path(&mddev->bitmap->storage.file->f_path,
5660 buf, sizeof(file->pathname));
6bcfd601 5661 if (IS_ERR(ptr))
32a7627c
N
5662 goto out;
5663
5664 strcpy(file->pathname, ptr);
5665
5666copy_out:
5667 err = 0;
5668 if (copy_to_user(arg, file, sizeof(*file)))
5669 err = -EFAULT;
5670out:
5671 kfree(buf);
5672 kfree(file);
5673 return err;
5674}
5675
fd01b88c 5676static int get_disk_info(struct mddev * mddev, void __user * arg)
1da177e4
LT
5677{
5678 mdu_disk_info_t info;
3cb03002 5679 struct md_rdev *rdev;
1da177e4
LT
5680
5681 if (copy_from_user(&info, arg, sizeof(info)))
5682 return -EFAULT;
5683
1ca69c4b
N
5684 rcu_read_lock();
5685 rdev = find_rdev_nr_rcu(mddev, info.number);
1da177e4
LT
5686 if (rdev) {
5687 info.major = MAJOR(rdev->bdev->bd_dev);
5688 info.minor = MINOR(rdev->bdev->bd_dev);
5689 info.raid_disk = rdev->raid_disk;
5690 info.state = 0;
b2d444d7 5691 if (test_bit(Faulty, &rdev->flags))
1da177e4 5692 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 5693 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT
5694 info.state |= (1<<MD_DISK_ACTIVE);
5695 info.state |= (1<<MD_DISK_SYNC);
5696 }
8ddf9efe
N
5697 if (test_bit(WriteMostly, &rdev->flags))
5698 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT
5699 } else {
5700 info.major = info.minor = 0;
5701 info.raid_disk = -1;
5702 info.state = (1<<MD_DISK_REMOVED);
5703 }
1ca69c4b 5704 rcu_read_unlock();
1da177e4
LT
5705
5706 if (copy_to_user(arg, &info, sizeof(info)))
5707 return -EFAULT;
5708
5709 return 0;
5710}
5711
fd01b88c 5712static int add_new_disk(struct mddev * mddev, mdu_disk_info_t *info)
1da177e4
LT
5713{
5714 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3cb03002 5715 struct md_rdev *rdev;
1da177e4
LT
5716 dev_t dev = MKDEV(info->major,info->minor);
5717
5718 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5719 return -EOVERFLOW;
5720
5721 if (!mddev->raid_disks) {
5722 int err;
5723 /* expecting a device which has a superblock */
5724 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5725 if (IS_ERR(rdev)) {
5726 printk(KERN_WARNING
5727 "md: md_import_device returned %ld\n",
5728 PTR_ERR(rdev));
5729 return PTR_ERR(rdev);
5730 }
5731 if (!list_empty(&mddev->disks)) {
3cb03002
N
5732 struct md_rdev *rdev0
5733 = list_entry(mddev->disks.next,
5734 struct md_rdev, same_set);
a9f326eb 5735 err = super_types[mddev->major_version]
1da177e4
LT
5736 .load_super(rdev, rdev0, mddev->minor_version);
5737 if (err < 0) {
5738 printk(KERN_WARNING
5739 "md: %s has different UUID to %s\n",
5740 bdevname(rdev->bdev,b),
5741 bdevname(rdev0->bdev,b2));
5742 export_rdev(rdev);
5743 return -EINVAL;
5744 }
5745 }
5746 err = bind_rdev_to_array(rdev, mddev);
5747 if (err)
5748 export_rdev(rdev);
5749 return err;
5750 }
5751
5752 /*
5753 * add_new_disk can be used once the array is assembled
5754 * to add "hot spares". They must already have a superblock
5755 * written
5756 */
5757 if (mddev->pers) {
5758 int err;
5759 if (!mddev->pers->hot_add_disk) {
5760 printk(KERN_WARNING
5761 "%s: personality does not support diskops!\n",
5762 mdname(mddev));
5763 return -EINVAL;
5764 }
7b1e35f6
N
5765 if (mddev->persistent)
5766 rdev = md_import_device(dev, mddev->major_version,
5767 mddev->minor_version);
5768 else
5769 rdev = md_import_device(dev, -1, -1);
1da177e4
LT
5770 if (IS_ERR(rdev)) {
5771 printk(KERN_WARNING
5772 "md: md_import_device returned %ld\n",
5773 PTR_ERR(rdev));
5774 return PTR_ERR(rdev);
5775 }
1a855a06 5776 /* set saved_raid_disk if appropriate */
41158c7e
N
5777 if (!mddev->persistent) {
5778 if (info->state & (1<<MD_DISK_SYNC) &&
bf572541 5779 info->raid_disk < mddev->raid_disks) {
41158c7e 5780 rdev->raid_disk = info->raid_disk;
bf572541 5781 set_bit(In_sync, &rdev->flags);
8313b8e5 5782 clear_bit(Bitmap_sync, &rdev->flags);
bf572541 5783 } else
41158c7e 5784 rdev->raid_disk = -1;
f466722c 5785 rdev->saved_raid_disk = rdev->raid_disk;
41158c7e
N
5786 } else
5787 super_types[mddev->major_version].
5788 validate_super(mddev, rdev);
bedd86b7 5789 if ((info->state & (1<<MD_DISK_SYNC)) &&
f4563091 5790 rdev->raid_disk != info->raid_disk) {
bedd86b7
N
5791 /* This was a hot-add request, but events doesn't
5792 * match, so reject it.
5793 */
5794 export_rdev(rdev);
5795 return -EINVAL;
5796 }
5797
b2d444d7 5798 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N
5799 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5800 set_bit(WriteMostly, &rdev->flags);
575a80fa
N
5801 else
5802 clear_bit(WriteMostly, &rdev->flags);
8ddf9efe 5803
1da177e4
LT
5804 rdev->raid_disk = -1;
5805 err = bind_rdev_to_array(rdev, mddev);
7c7546cc
N
5806 if (!err && !mddev->pers->hot_remove_disk) {
5807 /* If there is hot_add_disk but no hot_remove_disk
5808 * then added disks for geometry changes,
5809 * and should be added immediately.
5810 */
5811 super_types[mddev->major_version].
5812 validate_super(mddev, rdev);
5813 err = mddev->pers->hot_add_disk(mddev, rdev);
5814 if (err)
5815 unbind_rdev_from_array(rdev);
5816 }
1da177e4
LT
5817 if (err)
5818 export_rdev(rdev);
52664732 5819 else
00bcb4ac 5820 sysfs_notify_dirent_safe(rdev->sysfs_state);
c361777f 5821
7ceb17e8 5822 set_bit(MD_CHANGE_DEVS, &mddev->flags);
72a23c21
NB
5823 if (mddev->degraded)
5824 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
c361777f 5825 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9864c005 5826 if (!err)
5827 md_new_event(mddev);
005eca5e 5828 md_wakeup_thread(mddev->thread);
1da177e4
LT
5829 return err;
5830 }
5831
5832 /* otherwise, add_new_disk is only allowed
5833 * for major_version==0 superblocks
5834 */
5835 if (mddev->major_version != 0) {
5836 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5837 mdname(mddev));
5838 return -EINVAL;
5839 }
5840
5841 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5842 int err;
d710e138 5843 rdev = md_import_device(dev, -1, 0);
1da177e4
LT
5844 if (IS_ERR(rdev)) {
5845 printk(KERN_WARNING
5846 "md: error, md_import_device() returned %ld\n",
5847 PTR_ERR(rdev));
5848 return PTR_ERR(rdev);
5849 }
5850 rdev->desc_nr = info->number;
5851 if (info->raid_disk < mddev->raid_disks)
5852 rdev->raid_disk = info->raid_disk;
5853 else
5854 rdev->raid_disk = -1;
5855
1da177e4 5856 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N
5857 if (info->state & (1<<MD_DISK_SYNC))
5858 set_bit(In_sync, &rdev->flags);
1da177e4 5859
8ddf9efe
N
5860 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5861 set_bit(WriteMostly, &rdev->flags);
5862
1da177e4
LT
5863 if (!mddev->persistent) {
5864 printk(KERN_INFO "md: nonpersistent superblock ...\n");
77304d2a
MS
5865 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5866 } else
57b2caa3 5867 rdev->sb_start = calc_dev_sboffset(rdev);
8190e754 5868 rdev->sectors = rdev->sb_start;
1da177e4 5869
2bf071bf
N
5870 err = bind_rdev_to_array(rdev, mddev);
5871 if (err) {
5872 export_rdev(rdev);
5873 return err;
5874 }
1da177e4
LT
5875 }
5876
5877 return 0;
5878}
5879
fd01b88c 5880static int hot_remove_disk(struct mddev * mddev, dev_t dev)
1da177e4
LT
5881{
5882 char b[BDEVNAME_SIZE];
3cb03002 5883 struct md_rdev *rdev;
1da177e4 5884
1da177e4
LT
5885 rdev = find_rdev(mddev, dev);
5886 if (!rdev)
5887 return -ENXIO;
5888
3ea8929d
N
5889 clear_bit(Blocked, &rdev->flags);
5890 remove_and_add_spares(mddev, rdev);
5891
1da177e4
LT
5892 if (rdev->raid_disk >= 0)
5893 goto busy;
5894
5895 kick_rdev_from_array(rdev);
850b2b42 5896 md_update_sb(mddev, 1);
d7603b7e 5897 md_new_event(mddev);
1da177e4
LT
5898
5899 return 0;
5900busy:
fdefa4d8 5901 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
1da177e4
LT
5902 bdevname(rdev->bdev,b), mdname(mddev));
5903 return -EBUSY;
5904}
5905
fd01b88c 5906static int hot_add_disk(struct mddev * mddev, dev_t dev)
1da177e4
LT
5907{
5908 char b[BDEVNAME_SIZE];
5909 int err;
3cb03002 5910 struct md_rdev *rdev;
1da177e4
LT
5911
5912 if (!mddev->pers)
5913 return -ENODEV;
5914
5915 if (mddev->major_version != 0) {
5916 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5917 " version-0 superblocks.\n",
5918 mdname(mddev));
5919 return -EINVAL;
5920 }
5921 if (!mddev->pers->hot_add_disk) {
5922 printk(KERN_WARNING
5923 "%s: personality does not support diskops!\n",
5924 mdname(mddev));
5925 return -EINVAL;
5926 }
5927
d710e138 5928 rdev = md_import_device(dev, -1, 0);
1da177e4
LT
5929 if (IS_ERR(rdev)) {
5930 printk(KERN_WARNING
5931 "md: error, md_import_device() returned %ld\n",
5932 PTR_ERR(rdev));
5933 return -EINVAL;
5934 }
5935
5936 if (mddev->persistent)
57b2caa3 5937 rdev->sb_start = calc_dev_sboffset(rdev);
1da177e4 5938 else
77304d2a 5939 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
1da177e4 5940
8190e754 5941 rdev->sectors = rdev->sb_start;
1da177e4 5942
b2d444d7 5943 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT
5944 printk(KERN_WARNING
5945 "md: can not hot-add faulty %s disk to %s!\n",
5946 bdevname(rdev->bdev,b), mdname(mddev));
5947 err = -EINVAL;
5948 goto abort_export;
5949 }
b2d444d7 5950 clear_bit(In_sync, &rdev->flags);
1da177e4 5951 rdev->desc_nr = -1;
5842730d 5952 rdev->saved_raid_disk = -1;
2bf071bf
N
5953 err = bind_rdev_to_array(rdev, mddev);
5954 if (err)
5955 goto abort_export;
1da177e4
LT
5956
5957 /*
5958 * The rest should better be atomic, we can have disk failures
5959 * noticed in interrupt contexts ...
5960 */
5961
1da177e4
LT
5962 rdev->raid_disk = -1;
5963
850b2b42 5964 md_update_sb(mddev, 1);
1da177e4
LT
5965
5966 /*
5967 * Kick recovery, maybe this spare has to be added to the
5968 * array immediately.
5969 */
5970 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5971 md_wakeup_thread(mddev->thread);
d7603b7e 5972 md_new_event(mddev);
1da177e4
LT
5973 return 0;
5974
1da177e4
LT
5975abort_export:
5976 export_rdev(rdev);
5977 return err;
5978}
5979
fd01b88c 5980static int set_bitmap_file(struct mddev *mddev, int fd)
32a7627c
N
5981{
5982 int err;
5983
36fa3063
N
5984 if (mddev->pers) {
5985 if (!mddev->pers->quiesce)
5986 return -EBUSY;
5987 if (mddev->recovery || mddev->sync_thread)
5988 return -EBUSY;
5989 /* we should be able to change the bitmap.. */
5990 }
32a7627c 5991
32a7627c 5992
36fa3063
N
5993 if (fd >= 0) {
5994 if (mddev->bitmap)
5995 return -EEXIST; /* cannot add when bitmap is present */
c3d9714e 5996 mddev->bitmap_info.file = fget(fd);
32a7627c 5997
c3d9714e 5998 if (mddev->bitmap_info.file == NULL) {
36fa3063
N
5999 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
6000 mdname(mddev));
6001 return -EBADF;
6002 }
6003
c3d9714e 6004 err = deny_bitmap_write_access(mddev->bitmap_info.file);
36fa3063
N
6005 if (err) {
6006 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
6007 mdname(mddev));
c3d9714e
N
6008 fput(mddev->bitmap_info.file);
6009 mddev->bitmap_info.file = NULL;
36fa3063
N
6010 return err;
6011 }
c3d9714e 6012 mddev->bitmap_info.offset = 0; /* file overrides offset */
36fa3063
N
6013 } else if (mddev->bitmap == NULL)
6014 return -ENOENT; /* cannot remove what isn't there */
6015 err = 0;
6016 if (mddev->pers) {
6017 mddev->pers->quiesce(mddev, 1);
69e51b44 6018 if (fd >= 0) {
36fa3063 6019 err = bitmap_create(mddev);
69e51b44
N
6020 if (!err)
6021 err = bitmap_load(mddev);
6022 }
d7375ab3 6023 if (fd < 0 || err) {
36fa3063 6024 bitmap_destroy(mddev);
d7375ab3
N
6025 fd = -1; /* make sure to put the file */
6026 }
36fa3063 6027 mddev->pers->quiesce(mddev, 0);
d7375ab3
N
6028 }
6029 if (fd < 0) {
c3d9714e
N
6030 if (mddev->bitmap_info.file) {
6031 restore_bitmap_write_access(mddev->bitmap_info.file);
6032 fput(mddev->bitmap_info.file);
acc55e22 6033 }
c3d9714e 6034 mddev->bitmap_info.file = NULL;
36fa3063
N
6035 }
6036
32a7627c
N
6037 return err;
6038}
6039
1da177e4
LT
6040/*
6041 * set_array_info is used two different ways
6042 * The original usage is when creating a new array.
6043 * In this usage, raid_disks is > 0 and it together with
6044 * level, size, not_persistent,layout,chunksize determine the
6045 * shape of the array.
6046 * This will always create an array with a type-0.90.0 superblock.
6047 * The newer usage is when assembling an array.
6048 * In this case raid_disks will be 0, and the major_version field is
6049 * use to determine which style super-blocks are to be found on the devices.
6050 * The minor and patch _version numbers are also kept incase the
6051 * super_block handler wishes to interpret them.
6052 */
fd01b88c 6053static int set_array_info(struct mddev * mddev, mdu_array_info_t *info)
1da177e4
LT
6054{
6055
6056 if (info->raid_disks == 0) {
6057 /* just setting version number for superblock loading */
6058 if (info->major_version < 0 ||
50511da3 6059 info->major_version >= ARRAY_SIZE(super_types) ||
1da177e4
LT
6060 super_types[info->major_version].name == NULL) {
6061 /* maybe try to auto-load a module? */
6062 printk(KERN_INFO
6063 "md: superblock version %d not known\n",
6064 info->major_version);
6065 return -EINVAL;
6066 }
6067 mddev->major_version = info->major_version;
6068 mddev->minor_version = info->minor_version;
6069 mddev->patch_version = info->patch_version;
3f9d7b0d 6070 mddev->persistent = !info->not_persistent;
cbd19983
N
6071 /* ensure mddev_put doesn't delete this now that there
6072 * is some minimal configuration.
6073 */
6074 mddev->ctime = get_seconds();
1da177e4
LT
6075 return 0;
6076 }
6077 mddev->major_version = MD_MAJOR_VERSION;
6078 mddev->minor_version = MD_MINOR_VERSION;
6079 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6080 mddev->ctime = get_seconds();
6081
6082 mddev->level = info->level;
17115e03 6083 mddev->clevel[0] = 0;
58c0fed4 6084 mddev->dev_sectors = 2 * (sector_t)info->size;
1da177e4
LT
6085 mddev->raid_disks = info->raid_disks;
6086 /* don't set md_minor, it is determined by which /dev/md* was
6087 * openned
6088 */
6089 if (info->state & (1<<MD_SB_CLEAN))
6090 mddev->recovery_cp = MaxSector;
6091 else
6092 mddev->recovery_cp = 0;
6093 mddev->persistent = ! info->not_persistent;
e691063a 6094 mddev->external = 0;
1da177e4
LT
6095
6096 mddev->layout = info->layout;
9d8f0363 6097 mddev->chunk_sectors = info->chunk_size >> 9;
1da177e4
LT
6098
6099 mddev->max_disks = MD_SB_DISKS;
6100
e691063a
N
6101 if (mddev->persistent)
6102 mddev->flags = 0;
850b2b42 6103 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 6104
c3d9714e 6105 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6409bb05 6106 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
c3d9714e 6107 mddev->bitmap_info.offset = 0;
b2a2703c 6108
f6705578
N
6109 mddev->reshape_position = MaxSector;
6110
1da177e4
LT
6111 /*
6112 * Generate a 128 bit UUID
6113 */
6114 get_random_bytes(mddev->uuid, 16);
6115
f6705578 6116 mddev->new_level = mddev->level;
664e7c41 6117 mddev->new_chunk_sectors = mddev->chunk_sectors;
f6705578
N
6118 mddev->new_layout = mddev->layout;
6119 mddev->delta_disks = 0;
2c810cdd 6120 mddev->reshape_backwards = 0;
f6705578 6121
1da177e4
LT
6122 return 0;
6123}
6124
fd01b88c 6125void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
1f403624 6126{
b522adcd
DW
6127 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6128
6129 if (mddev->external_size)
6130 return;
6131
1f403624
DW
6132 mddev->array_sectors = array_sectors;
6133}
6134EXPORT_SYMBOL(md_set_array_sectors);
6135
fd01b88c 6136static int update_size(struct mddev *mddev, sector_t num_sectors)
a35b0d69 6137{
3cb03002 6138 struct md_rdev *rdev;
a35b0d69 6139 int rv;
d71f9f88 6140 int fit = (num_sectors == 0);
a35b0d69
N
6141
6142 if (mddev->pers->resize == NULL)
6143 return -EINVAL;
d71f9f88
AN
6144 /* The "num_sectors" is the number of sectors of each device that
6145 * is used. This can only make sense for arrays with redundancy.
6146 * linear and raid0 always use whatever space is available. We can only
6147 * consider changing this number if no resync or reconstruction is
6148 * happening, and if the new size is acceptable. It must fit before the
0f420358 6149 * sb_start or, if that is <data_offset, it must fit before the size
d71f9f88
AN
6150 * of each device. If num_sectors is zero, we find the largest size
6151 * that fits.
a35b0d69
N
6152 */
6153 if (mddev->sync_thread)
6154 return -EBUSY;
a4a6125a 6155
dafb20fa 6156 rdev_for_each(rdev, mddev) {
dd8ac336 6157 sector_t avail = rdev->sectors;
01ab5662 6158
d71f9f88
AN
6159 if (fit && (num_sectors == 0 || num_sectors > avail))
6160 num_sectors = avail;
6161 if (avail < num_sectors)
a35b0d69
N
6162 return -ENOSPC;
6163 }
d71f9f88 6164 rv = mddev->pers->resize(mddev, num_sectors);
449aad3e
N
6165 if (!rv)
6166 revalidate_disk(mddev->gendisk);
a35b0d69
N
6167 return rv;
6168}
6169
fd01b88c 6170static int update_raid_disks(struct mddev *mddev, int raid_disks)
da943b99
N
6171{
6172 int rv;
c6563a8c 6173 struct md_rdev *rdev;
da943b99 6174 /* change the number of raid disks */
63c70c4f 6175 if (mddev->pers->check_reshape == NULL)
da943b99
N
6176 return -EINVAL;
6177 if (raid_disks <= 0 ||
233fca36 6178 (mddev->max_disks && raid_disks >= mddev->max_disks))
da943b99 6179 return -EINVAL;
63c70c4f 6180 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
da943b99 6181 return -EBUSY;
c6563a8c
N
6182
6183 rdev_for_each(rdev, mddev) {
6184 if (mddev->raid_disks < raid_disks &&
6185 rdev->data_offset < rdev->new_data_offset)
6186 return -EINVAL;
6187 if (mddev->raid_disks > raid_disks &&
6188 rdev->data_offset > rdev->new_data_offset)
6189 return -EINVAL;
6190 }
6191
63c70c4f 6192 mddev->delta_disks = raid_disks - mddev->raid_disks;
2c810cdd
N
6193 if (mddev->delta_disks < 0)
6194 mddev->reshape_backwards = 1;
6195 else if (mddev->delta_disks > 0)
6196 mddev->reshape_backwards = 0;
63c70c4f
N
6197
6198 rv = mddev->pers->check_reshape(mddev);
2c810cdd 6199 if (rv < 0) {
de171cb9 6200 mddev->delta_disks = 0;
2c810cdd
N
6201 mddev->reshape_backwards = 0;
6202 }
da943b99
N
6203 return rv;
6204}
6205
6206
1da177e4
LT
6207/*
6208 * update_array_info is used to change the configuration of an
6209 * on-line array.
6210 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6211 * fields in the info are checked against the array.
6212 * Any differences that cannot be handled will cause an error.
6213 * Normally, only one change can be managed at a time.
6214 */
fd01b88c 6215static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
1da177e4
LT
6216{
6217 int rv = 0;
6218 int cnt = 0;
36fa3063
N
6219 int state = 0;
6220
6221 /* calculate expected state,ignoring low bits */
c3d9714e 6222 if (mddev->bitmap && mddev->bitmap_info.offset)
36fa3063 6223 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT
6224
6225 if (mddev->major_version != info->major_version ||
6226 mddev->minor_version != info->minor_version ||
6227/* mddev->patch_version != info->patch_version || */
6228 mddev->ctime != info->ctime ||
6229 mddev->level != info->level ||
6230/* mddev->layout != info->layout || */
6231 !mddev->persistent != info->not_persistent||
9d8f0363 6232 mddev->chunk_sectors != info->chunk_size >> 9 ||
36fa3063
N
6233 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6234 ((state^info->state) & 0xfffffe00)
6235 )
1da177e4
LT
6236 return -EINVAL;
6237 /* Check there is only one change */
58c0fed4
AN
6238 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6239 cnt++;
6240 if (mddev->raid_disks != info->raid_disks)
6241 cnt++;
6242 if (mddev->layout != info->layout)
6243 cnt++;
6244 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6245 cnt++;
6246 if (cnt == 0)
6247 return 0;
6248 if (cnt > 1)
6249 return -EINVAL;
1da177e4
LT
6250
6251 if (mddev->layout != info->layout) {
6252 /* Change layout
6253 * we don't need to do anything at the md level, the
6254 * personality will take care of it all.
6255 */
50ac168a 6256 if (mddev->pers->check_reshape == NULL)
1da177e4 6257 return -EINVAL;
597a711b
N
6258 else {
6259 mddev->new_layout = info->layout;
50ac168a 6260 rv = mddev->pers->check_reshape(mddev);
597a711b
N
6261 if (rv)
6262 mddev->new_layout = mddev->layout;
6263 return rv;
6264 }
1da177e4 6265 }
58c0fed4 6266 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
d71f9f88 6267 rv = update_size(mddev, (sector_t)info->size * 2);
a35b0d69 6268
da943b99
N
6269 if (mddev->raid_disks != info->raid_disks)
6270 rv = update_raid_disks(mddev, info->raid_disks);
6271
36fa3063
N
6272 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6273 if (mddev->pers->quiesce == NULL)
6274 return -EINVAL;
6275 if (mddev->recovery || mddev->sync_thread)
6276 return -EBUSY;
6277 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6278 /* add the bitmap */
6279 if (mddev->bitmap)
6280 return -EEXIST;
c3d9714e 6281 if (mddev->bitmap_info.default_offset == 0)
36fa3063 6282 return -EINVAL;
c3d9714e
N
6283 mddev->bitmap_info.offset =
6284 mddev->bitmap_info.default_offset;
6409bb05
N
6285 mddev->bitmap_info.space =
6286 mddev->bitmap_info.default_space;
36fa3063
N
6287 mddev->pers->quiesce(mddev, 1);
6288 rv = bitmap_create(mddev);
69e51b44
N
6289 if (!rv)
6290 rv = bitmap_load(mddev);
36fa3063
N
6291 if (rv)
6292 bitmap_destroy(mddev);
6293 mddev->pers->quiesce(mddev, 0);
6294 } else {
6295 /* remove the bitmap */
6296 if (!mddev->bitmap)
6297 return -ENOENT;
1ec885cd 6298 if (mddev->bitmap->storage.file)
36fa3063
N
6299 return -EINVAL;
6300 mddev->pers->quiesce(mddev, 1);
6301 bitmap_destroy(mddev);
6302 mddev->pers->quiesce(mddev, 0);
c3d9714e 6303 mddev->bitmap_info.offset = 0;
36fa3063
N
6304 }
6305 }
850b2b42 6306 md_update_sb(mddev, 1);
1da177e4
LT
6307 return rv;
6308}
6309
fd01b88c 6310static int set_disk_faulty(struct mddev *mddev, dev_t dev)
1da177e4 6311{
3cb03002 6312 struct md_rdev *rdev;
1ca69c4b 6313 int err = 0;
1da177e4
LT
6314
6315 if (mddev->pers == NULL)
6316 return -ENODEV;
6317
1ca69c4b
N
6318 rcu_read_lock();
6319 rdev = find_rdev_rcu(mddev, dev);
1da177e4 6320 if (!rdev)
1ca69c4b
N
6321 err = -ENODEV;
6322 else {
6323 md_error(mddev, rdev);
6324 if (!test_bit(Faulty, &rdev->flags))
6325 err = -EBUSY;
6326 }
6327 rcu_read_unlock();
6328 return err;
1da177e4
LT
6329}
6330
2f9618ce
AN
6331/*
6332 * We have a problem here : there is no easy way to give a CHS
6333 * virtual geometry. We currently pretend that we have a 2 heads
6334 * 4 sectors (with a BIG number of cylinders...). This drives
6335 * dosfs just mad... ;-)
6336 */
a885c8c4
CH
6337static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6338{
fd01b88c 6339 struct mddev *mddev = bdev->bd_disk->private_data;
a885c8c4
CH
6340
6341 geo->heads = 2;
6342 geo->sectors = 4;
49ce6cea 6343 geo->cylinders = mddev->array_sectors / 8;
a885c8c4
CH
6344 return 0;
6345}
6346
cb335f88
NS
6347static inline bool md_ioctl_valid(unsigned int cmd)
6348{
6349 switch (cmd) {
6350 case ADD_NEW_DISK:
6351 case BLKROSET:
6352 case GET_ARRAY_INFO:
6353 case GET_BITMAP_FILE:
6354 case GET_DISK_INFO:
6355 case HOT_ADD_DISK:
6356 case HOT_REMOVE_DISK:
6357 case PRINT_RAID_DEBUG:
6358 case RAID_AUTORUN:
6359 case RAID_VERSION:
6360 case RESTART_ARRAY_RW:
6361 case RUN_ARRAY:
6362 case SET_ARRAY_INFO:
6363 case SET_BITMAP_FILE:
6364 case SET_DISK_FAULTY:
6365 case STOP_ARRAY:
6366 case STOP_ARRAY_RO:
6367 return true;
6368 default:
6369 return false;
6370 }
6371}
6372
a39907fa 6373static int md_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT
6374 unsigned int cmd, unsigned long arg)
6375{
6376 int err = 0;
6377 void __user *argp = (void __user *)arg;
fd01b88c 6378 struct mddev *mddev = NULL;
e2218350 6379 int ro;
1da177e4 6380
cb335f88
NS
6381 if (!md_ioctl_valid(cmd))
6382 return -ENOTTY;
6383
506c9e44
N
6384 switch (cmd) {
6385 case RAID_VERSION:
6386 case GET_ARRAY_INFO:
6387 case GET_DISK_INFO:
6388 break;
6389 default:
6390 if (!capable(CAP_SYS_ADMIN))
6391 return -EACCES;
6392 }
1da177e4
LT
6393
6394 /*
6395 * Commands dealing with the RAID driver but not any
6396 * particular array:
6397 */
c02c0aeb
N
6398 switch (cmd) {
6399 case RAID_VERSION:
6400 err = get_version(argp);
6401 goto done;
1da177e4 6402
c02c0aeb
N
6403 case PRINT_RAID_DEBUG:
6404 err = 0;
6405 md_print_devices();
6406 goto done;
1da177e4
LT
6407
6408#ifndef MODULE
c02c0aeb
N
6409 case RAID_AUTORUN:
6410 err = 0;
6411 autostart_arrays(arg);
6412 goto done;
1da177e4 6413#endif
c02c0aeb 6414 default:;
1da177e4
LT
6415 }
6416
6417 /*
6418 * Commands creating/starting a new array:
6419 */
6420
a39907fa 6421 mddev = bdev->bd_disk->private_data;
1da177e4
LT
6422
6423 if (!mddev) {
6424 BUG();
6425 goto abort;
6426 }
6427
1ca69c4b
N
6428 /* Some actions do not requires the mutex */
6429 switch (cmd) {
6430 case GET_ARRAY_INFO:
6431 if (!mddev->raid_disks && !mddev->external)
6432 err = -ENODEV;
6433 else
6434 err = get_array_info(mddev, argp);
6435 goto abort;
6436
6437 case GET_DISK_INFO:
6438 if (!mddev->raid_disks && !mddev->external)
6439 err = -ENODEV;
6440 else
6441 err = get_disk_info(mddev, argp);
6442 goto abort;
6443
6444 case SET_DISK_FAULTY:
6445 err = set_disk_faulty(mddev, new_decode_dev(arg));
6446 goto abort;
6447 }
6448
a7a3f08d
N
6449 if (cmd == ADD_NEW_DISK)
6450 /* need to ensure md_delayed_delete() has completed */
6451 flush_workqueue(md_misc_wq);
6452
90f5f7ad
HR
6453 if (cmd == HOT_REMOVE_DISK)
6454 /* need to ensure recovery thread has run */
6455 wait_event_interruptible_timeout(mddev->sb_wait,
6456 !test_bit(MD_RECOVERY_NEEDED,
6457 &mddev->flags),
6458 msecs_to_jiffies(5000));
260fa034
N
6459 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
6460 /* Need to flush page cache, and ensure no-one else opens
6461 * and writes
6462 */
6463 mutex_lock(&mddev->open_mutex);
6464 if (atomic_read(&mddev->openers) > 1) {
6465 mutex_unlock(&mddev->open_mutex);
6466 err = -EBUSY;
6467 goto abort;
6468 }
6469 set_bit(MD_STILL_CLOSED, &mddev->flags);
6470 mutex_unlock(&mddev->open_mutex);
6471 sync_blockdev(bdev);
6472 }
1da177e4
LT
6473 err = mddev_lock(mddev);
6474 if (err) {
6475 printk(KERN_INFO
6476 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6477 err, cmd);
6478 goto abort;
6479 }
6480
c02c0aeb
N
6481 if (cmd == SET_ARRAY_INFO) {
6482 mdu_array_info_t info;
6483 if (!arg)
6484 memset(&info, 0, sizeof(info));
6485 else if (copy_from_user(&info, argp, sizeof(info))) {
6486 err = -EFAULT;
6487 goto abort_unlock;
6488 }
6489 if (mddev->pers) {
6490 err = update_array_info(mddev, &info);
6491 if (err) {
6492 printk(KERN_WARNING "md: couldn't update"
6493 " array info. %d\n", err);
6494 goto abort_unlock;
1da177e4
LT
6495 }
6496 goto done_unlock;
c02c0aeb
N
6497 }
6498 if (!list_empty(&mddev->disks)) {
6499 printk(KERN_WARNING
6500 "md: array %s already has disks!\n",
6501 mdname(mddev));
6502 err = -EBUSY;
6503 goto abort_unlock;
6504 }
6505 if (mddev->raid_disks) {
6506 printk(KERN_WARNING
6507 "md: array %s already initialised!\n",
6508 mdname(mddev));
6509 err = -EBUSY;
6510 goto abort_unlock;
6511 }
6512 err = set_array_info(mddev, &info);
6513 if (err) {
6514 printk(KERN_WARNING "md: couldn't set"
6515 " array info. %d\n", err);
6516 goto abort_unlock;
6517 }
6518 goto done_unlock;
1da177e4
LT
6519 }
6520
6521 /*
6522 * Commands querying/configuring an existing array:
6523 */
32a7627c 6524 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3f9d7b0d 6525 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
a17184a9
N
6526 if ((!mddev->raid_disks && !mddev->external)
6527 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6528 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6529 && cmd != GET_BITMAP_FILE) {
1da177e4
LT
6530 err = -ENODEV;
6531 goto abort_unlock;
6532 }
6533
6534 /*
6535 * Commands even a read-only array can execute:
6536 */
c02c0aeb
N
6537 switch (cmd) {
6538 case GET_BITMAP_FILE:
6539 err = get_bitmap_file(mddev, argp);
6540 goto done_unlock;
32a7627c 6541
c02c0aeb
N
6542 case RESTART_ARRAY_RW:
6543 err = restart_array(mddev);
6544 goto done_unlock;
1da177e4 6545
c02c0aeb
N
6546 case STOP_ARRAY:
6547 err = do_md_stop(mddev, 0, bdev);
6548 goto done_unlock;
1da177e4 6549
c02c0aeb
N
6550 case STOP_ARRAY_RO:
6551 err = md_set_readonly(mddev, bdev);
6552 goto done_unlock;
1da177e4 6553
3ea8929d
N
6554 case HOT_REMOVE_DISK:
6555 err = hot_remove_disk(mddev, new_decode_dev(arg));
6556 goto done_unlock;
6557
7ceb17e8
N
6558 case ADD_NEW_DISK:
6559 /* We can support ADD_NEW_DISK on read-only arrays
6560 * on if we are re-adding a preexisting device.
6561 * So require mddev->pers and MD_DISK_SYNC.
6562 */
6563 if (mddev->pers) {
6564 mdu_disk_info_t info;
6565 if (copy_from_user(&info, argp, sizeof(info)))
6566 err = -EFAULT;
6567 else if (!(info.state & (1<<MD_DISK_SYNC)))
6568 /* Need to clear read-only for this */
6569 break;
6570 else
6571 err = add_new_disk(mddev, &info);
6572 goto done_unlock;
6573 }
6574 break;
6575
c02c0aeb
N
6576 case BLKROSET:
6577 if (get_user(ro, (int __user *)(arg))) {
6578 err = -EFAULT;
6579 goto done_unlock;
6580 }
6581 err = -EINVAL;
e2218350 6582
c02c0aeb
N
6583 /* if the bdev is going readonly the value of mddev->ro
6584 * does not matter, no writes are coming
6585 */
6586 if (ro)
6587 goto done_unlock;
e2218350 6588
c02c0aeb
N
6589 /* are we are already prepared for writes? */
6590 if (mddev->ro != 1)
6591 goto done_unlock;
e2218350 6592
c02c0aeb
N
6593 /* transitioning to readauto need only happen for
6594 * arrays that call md_write_start
6595 */
6596 if (mddev->pers) {
6597 err = restart_array(mddev);
6598 if (err == 0) {
6599 mddev->ro = 2;
6600 set_disk_ro(mddev->gendisk, 0);
e2218350 6601 }
c02c0aeb
N
6602 }
6603 goto done_unlock;
1da177e4
LT
6604 }
6605
6606 /*
6607 * The remaining ioctls are changing the state of the
f91de92e
N
6608 * superblock, so we do not allow them on read-only arrays.
6609 * However non-MD ioctls (e.g. get-size) will still come through
6610 * here and hit the 'default' below, so only disallow
6611 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 6612 */
bb57fc64 6613 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
f91de92e
N
6614 if (mddev->ro == 2) {
6615 mddev->ro = 0;
00bcb4ac 6616 sysfs_notify_dirent_safe(mddev->sysfs_state);
0fd62b86 6617 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
f3378b48
N
6618 /* mddev_unlock will wake thread */
6619 /* If a device failed while we were read-only, we
6620 * need to make sure the metadata is updated now.
6621 */
6622 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
6623 mddev_unlock(mddev);
6624 wait_event(mddev->sb_wait,
6625 !test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
6626 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
29f097c4 6627 mddev_lock_nointr(mddev);
f3378b48 6628 }
f91de92e
N
6629 } else {
6630 err = -EROFS;
6631 goto abort_unlock;
6632 }
1da177e4
LT
6633 }
6634
c02c0aeb
N
6635 switch (cmd) {
6636 case ADD_NEW_DISK:
1da177e4 6637 {
c02c0aeb
N
6638 mdu_disk_info_t info;
6639 if (copy_from_user(&info, argp, sizeof(info)))
6640 err = -EFAULT;
6641 else
6642 err = add_new_disk(mddev, &info);
6643 goto done_unlock;
6644 }
1da177e4 6645
c02c0aeb
N
6646 case HOT_ADD_DISK:
6647 err = hot_add_disk(mddev, new_decode_dev(arg));
6648 goto done_unlock;
1da177e4 6649
c02c0aeb
N
6650 case RUN_ARRAY:
6651 err = do_md_run(mddev);
6652 goto done_unlock;
1da177e4 6653
c02c0aeb
N
6654 case SET_BITMAP_FILE:
6655 err = set_bitmap_file(mddev, (int)arg);
6656 goto done_unlock;
32a7627c 6657
c02c0aeb
N
6658 default:
6659 err = -EINVAL;
6660 goto abort_unlock;
1da177e4
LT
6661 }
6662
6663done_unlock:
6664abort_unlock:
d3374825
N
6665 if (mddev->hold_active == UNTIL_IOCTL &&
6666 err != -EINVAL)
6667 mddev->hold_active = 0;
1da177e4
LT
6668 mddev_unlock(mddev);
6669
6670 return err;
6671done:
6672 if (err)
6673 MD_BUG();
6674abort:
6675 return err;
6676}
aa98aa31
AB
6677#ifdef CONFIG_COMPAT
6678static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
6679 unsigned int cmd, unsigned long arg)
6680{
6681 switch (cmd) {
6682 case HOT_REMOVE_DISK:
6683 case HOT_ADD_DISK:
6684 case SET_DISK_FAULTY:
6685 case SET_BITMAP_FILE:
6686 /* These take in integer arg, do not convert */
6687 break;
6688 default:
6689 arg = (unsigned long)compat_ptr(arg);
6690 break;
6691 }
6692
6693 return md_ioctl(bdev, mode, cmd, arg);
6694}
6695#endif /* CONFIG_COMPAT */
1da177e4 6696
a39907fa 6697static int md_open(struct block_device *bdev, fmode_t mode)
1da177e4
LT
6698{
6699 /*
6700 * Succeed if we can lock the mddev, which confirms that
6701 * it isn't being stopped right now.
6702 */
fd01b88c 6703 struct mddev *mddev = mddev_find(bdev->bd_dev);
1da177e4
LT
6704 int err;
6705
0c098220
YL
6706 if (!mddev)
6707 return -ENODEV;
6708
d3374825
N
6709 if (mddev->gendisk != bdev->bd_disk) {
6710 /* we are racing with mddev_put which is discarding this
6711 * bd_disk.
6712 */
6713 mddev_put(mddev);
6714 /* Wait until bdev->bd_disk is definitely gone */
e804ac78 6715 flush_workqueue(md_misc_wq);
d3374825
N
6716 /* Then retry the open from the top */
6717 return -ERESTARTSYS;
6718 }
6719 BUG_ON(mddev != bdev->bd_disk->private_data);
6720
c8c00a69 6721 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
1da177e4
LT
6722 goto out;
6723
6724 err = 0;
f2ea68cf 6725 atomic_inc(&mddev->openers);
260fa034 6726 clear_bit(MD_STILL_CLOSED, &mddev->flags);
c8c00a69 6727 mutex_unlock(&mddev->open_mutex);
1da177e4 6728
f0b4f7e2 6729 check_disk_change(bdev);
1da177e4
LT
6730 out:
6731 return err;
6732}
6733
db2a144b 6734static void md_release(struct gendisk *disk, fmode_t mode)
1da177e4 6735{
fd01b88c 6736 struct mddev *mddev = disk->private_data;
1da177e4 6737
52e5f9d1 6738 BUG_ON(!mddev);
f2ea68cf 6739 atomic_dec(&mddev->openers);
1da177e4 6740 mddev_put(mddev);
1da177e4 6741}
f0b4f7e2
N
6742
6743static int md_media_changed(struct gendisk *disk)
6744{
fd01b88c 6745 struct mddev *mddev = disk->private_data;
f0b4f7e2
N
6746
6747 return mddev->changed;
6748}
6749
6750static int md_revalidate(struct gendisk *disk)
6751{
fd01b88c 6752 struct mddev *mddev = disk->private_data;
f0b4f7e2
N
6753
6754 mddev->changed = 0;
6755 return 0;
6756}
83d5cde4 6757static const struct block_device_operations md_fops =
1da177e4
LT
6758{
6759 .owner = THIS_MODULE,
a39907fa
AV
6760 .open = md_open,
6761 .release = md_release,
b492b852 6762 .ioctl = md_ioctl,
aa98aa31
AB
6763#ifdef CONFIG_COMPAT
6764 .compat_ioctl = md_compat_ioctl,
6765#endif
a885c8c4 6766 .getgeo = md_getgeo,
f0b4f7e2
N
6767 .media_changed = md_media_changed,
6768 .revalidate_disk= md_revalidate,
1da177e4
LT
6769};
6770
75c96f85 6771static int md_thread(void * arg)
1da177e4 6772{
2b8bf345 6773 struct md_thread *thread = arg;
1da177e4 6774
1da177e4
LT
6775 /*
6776 * md_thread is a 'system-thread', it's priority should be very
6777 * high. We avoid resource deadlocks individually in each
6778 * raid personality. (RAID5 does preallocation) We also use RR and
6779 * the very same RT priority as kswapd, thus we will never get
6780 * into a priority inversion deadlock.
6781 *
6782 * we definitely have to have equal or higher priority than
6783 * bdflush, otherwise bdflush will deadlock if there are too
6784 * many dirty RAID5 blocks.
6785 */
1da177e4 6786
6985c43f 6787 allow_signal(SIGKILL);
a6fb0934 6788 while (!kthread_should_stop()) {
1da177e4 6789
93588e22
N
6790 /* We need to wait INTERRUPTIBLE so that
6791 * we don't add to the load-average.
6792 * That means we need to be sure no signals are
6793 * pending
6794 */
6795 if (signal_pending(current))
6796 flush_signals(current);
6797
6798 wait_event_interruptible_timeout
6799 (thread->wqueue,
6800 test_bit(THREAD_WAKEUP, &thread->flags)
6801 || kthread_should_stop(),
6802 thread->timeout);
1da177e4 6803
6c987910
N
6804 clear_bit(THREAD_WAKEUP, &thread->flags);
6805 if (!kthread_should_stop())
4ed8731d 6806 thread->run(thread);
1da177e4 6807 }
a6fb0934 6808
1da177e4
LT
6809 return 0;
6810}
6811
2b8bf345 6812void md_wakeup_thread(struct md_thread *thread)
1da177e4
LT
6813{
6814 if (thread) {
36a4e1fe 6815 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
1da177e4
LT
6816 set_bit(THREAD_WAKEUP, &thread->flags);
6817 wake_up(&thread->wqueue);
6818 }
6819}
6820
4ed8731d
SL
6821struct md_thread *md_register_thread(void (*run) (struct md_thread *),
6822 struct mddev *mddev, const char *name)
1da177e4 6823{
2b8bf345 6824 struct md_thread *thread;
1da177e4 6825
2b8bf345 6826 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
1da177e4
LT
6827 if (!thread)
6828 return NULL;
6829
1da177e4
LT
6830 init_waitqueue_head(&thread->wqueue);
6831
1da177e4
LT
6832 thread->run = run;
6833 thread->mddev = mddev;
32a7627c 6834 thread->timeout = MAX_SCHEDULE_TIMEOUT;
0da3c619
N
6835 thread->tsk = kthread_run(md_thread, thread,
6836 "%s_%s",
6837 mdname(thread->mddev),
0232605d 6838 name);
a6fb0934 6839 if (IS_ERR(thread->tsk)) {
1da177e4
LT
6840 kfree(thread);
6841 return NULL;
6842 }
1da177e4
LT
6843 return thread;
6844}
6845
2b8bf345 6846void md_unregister_thread(struct md_thread **threadp)
1da177e4 6847{
2b8bf345 6848 struct md_thread *thread = *threadp;
e0cf8f04
N
6849 if (!thread)
6850 return;
36a4e1fe 6851 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
01f96c0a
N
6852 /* Locking ensures that mddev_unlock does not wake_up a
6853 * non-existent thread
6854 */
6855 spin_lock(&pers_lock);
6856 *threadp = NULL;
6857 spin_unlock(&pers_lock);
a6fb0934
N
6858
6859 kthread_stop(thread->tsk);
1da177e4
LT
6860 kfree(thread);
6861}
6862
fd01b88c 6863void md_error(struct mddev *mddev, struct md_rdev *rdev)
1da177e4
LT
6864{
6865 if (!mddev) {
6866 MD_BUG();
6867 return;
6868 }
6869
b2d444d7 6870 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 6871 return;
6bfe0b49 6872
de393cde 6873 if (!mddev->pers || !mddev->pers->error_handler)
1da177e4
LT
6874 return;
6875 mddev->pers->error_handler(mddev,rdev);
72a23c21
NB
6876 if (mddev->degraded)
6877 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
00bcb4ac 6878 sysfs_notify_dirent_safe(rdev->sysfs_state);
1da177e4
LT
6879 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6880 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6881 md_wakeup_thread(mddev->thread);
768a418d 6882 if (mddev->event_work.func)
e804ac78 6883 queue_work(md_misc_wq, &mddev->event_work);
c331eb04 6884 md_new_event_inintr(mddev);
1da177e4
LT
6885}
6886
6887/* seq_file implementation /proc/mdstat */
6888
6889static void status_unused(struct seq_file *seq)
6890{
6891 int i = 0;
3cb03002 6892 struct md_rdev *rdev;
1da177e4
LT
6893
6894 seq_printf(seq, "unused devices: ");
6895
159ec1fc 6896 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
1da177e4
LT
6897 char b[BDEVNAME_SIZE];
6898 i++;
6899 seq_printf(seq, "%s ",
6900 bdevname(rdev->bdev,b));
6901 }
6902 if (!i)
6903 seq_printf(seq, "<none>");
6904
6905 seq_printf(seq, "\n");
6906}
6907
6908
fd01b88c 6909static void status_resync(struct seq_file *seq, struct mddev * mddev)
1da177e4 6910{
dd71cf6b
N
6911 sector_t max_sectors, resync, res;
6912 unsigned long dt, db;
6913 sector_t rt;
4588b42e
N
6914 int scale;
6915 unsigned int per_milli;
1da177e4 6916
72f36d59
N
6917 if (mddev->curr_resync <= 3)
6918 resync = 0;
6919 else
6920 resync = mddev->curr_resync
6921 - atomic_read(&mddev->recovery_active);
1da177e4 6922
c804cdec
N
6923 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
6924 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
dd71cf6b 6925 max_sectors = mddev->resync_max_sectors;
1da177e4 6926 else
dd71cf6b 6927 max_sectors = mddev->dev_sectors;
1da177e4
LT
6928
6929 /*
6930 * Should not happen.
6931 */
dd71cf6b 6932 if (!max_sectors) {
1da177e4
LT
6933 MD_BUG();
6934 return;
6935 }
4588b42e 6936 /* Pick 'scale' such that (resync>>scale)*1000 will fit
dd71cf6b 6937 * in a sector_t, and (max_sectors>>scale) will fit in a
4588b42e
N
6938 * u32, as those are the requirements for sector_div.
6939 * Thus 'scale' must be at least 10
6940 */
6941 scale = 10;
6942 if (sizeof(sector_t) > sizeof(unsigned long)) {
dd71cf6b 6943 while ( max_sectors/2 > (1ULL<<(scale+32)))
4588b42e
N
6944 scale++;
6945 }
6946 res = (resync>>scale)*1000;
dd71cf6b 6947 sector_div(res, (u32)((max_sectors>>scale)+1));
4588b42e
N
6948
6949 per_milli = res;
1da177e4 6950 {
4588b42e 6951 int i, x = per_milli/50, y = 20-x;
1da177e4
LT
6952 seq_printf(seq, "[");
6953 for (i = 0; i < x; i++)
6954 seq_printf(seq, "=");
6955 seq_printf(seq, ">");
6956 for (i = 0; i < y; i++)
6957 seq_printf(seq, ".");
6958 seq_printf(seq, "] ");
6959 }
4588b42e 6960 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
ccfcc3c1
N
6961 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6962 "reshape" :
61df9d91
N
6963 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6964 "check" :
6965 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6966 "resync" : "recovery"))),
6967 per_milli/10, per_milli % 10,
dd71cf6b
N
6968 (unsigned long long) resync/2,
6969 (unsigned long long) max_sectors/2);
1da177e4
LT
6970
6971 /*
1da177e4
LT
6972 * dt: time from mark until now
6973 * db: blocks written from mark until now
6974 * rt: remaining time
dd71cf6b
N
6975 *
6976 * rt is a sector_t, so could be 32bit or 64bit.
6977 * So we divide before multiply in case it is 32bit and close
6978 * to the limit.
25985edc 6979 * We scale the divisor (db) by 32 to avoid losing precision
dd71cf6b
N
6980 * near the end of resync when the number of remaining sectors
6981 * is close to 'db'.
6982 * We then divide rt by 32 after multiplying by db to compensate.
6983 * The '+1' avoids division by zero if db is very small.
1da177e4
LT
6984 */
6985 dt = ((jiffies - mddev->resync_mark) / HZ);
6986 if (!dt) dt++;
ff4e8d9a
N
6987 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6988 - mddev->resync_mark_cnt;
1da177e4 6989
dd71cf6b
N
6990 rt = max_sectors - resync; /* number of remaining sectors */
6991 sector_div(rt, db/32+1);
6992 rt *= dt;
6993 rt >>= 5;
6994
6995 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6996 ((unsigned long)rt % 60)/6);
1da177e4 6997
ff4e8d9a 6998 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
1da177e4
LT
6999}
7000
7001static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7002{
7003 struct list_head *tmp;
7004 loff_t l = *pos;
fd01b88c 7005 struct mddev *mddev;
1da177e4
LT
7006
7007 if (l >= 0x10000)
7008 return NULL;
7009 if (!l--)
7010 /* header */
7011 return (void*)1;
7012
7013 spin_lock(&all_mddevs_lock);
7014 list_for_each(tmp,&all_mddevs)
7015 if (!l--) {
fd01b88c 7016 mddev = list_entry(tmp, struct mddev, all_mddevs);
1da177e4
LT
7017 mddev_get(mddev);
7018 spin_unlock(&all_mddevs_lock);
7019 return mddev;
7020 }
7021 spin_unlock(&all_mddevs_lock);
7022 if (!l--)
7023 return (void*)2;/* tail */
7024 return NULL;
7025}
7026
7027static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7028{
7029 struct list_head *tmp;
fd01b88c 7030 struct mddev *next_mddev, *mddev = v;
1da177e4
LT
7031
7032 ++*pos;
7033 if (v == (void*)2)
7034 return NULL;
7035
7036 spin_lock(&all_mddevs_lock);
7037 if (v == (void*)1)
7038 tmp = all_mddevs.next;
7039 else
7040 tmp = mddev->all_mddevs.next;
7041 if (tmp != &all_mddevs)
fd01b88c 7042 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
1da177e4
LT
7043 else {
7044 next_mddev = (void*)2;
7045 *pos = 0x10000;
7046 }
7047 spin_unlock(&all_mddevs_lock);
7048
7049 if (v != (void*)1)
7050 mddev_put(mddev);
7051 return next_mddev;
7052
7053}
7054
7055static void md_seq_stop(struct seq_file *seq, void *v)
7056{
fd01b88c 7057 struct mddev *mddev = v;
1da177e4
LT
7058
7059 if (mddev && v != (void*)1 && v != (void*)2)
7060 mddev_put(mddev);
7061}
7062
7063static int md_seq_show(struct seq_file *seq, void *v)
7064{
fd01b88c 7065 struct mddev *mddev = v;
dd8ac336 7066 sector_t sectors;
3cb03002 7067 struct md_rdev *rdev;
1da177e4
LT
7068
7069 if (v == (void*)1) {
84fc4b56 7070 struct md_personality *pers;
1da177e4
LT
7071 seq_printf(seq, "Personalities : ");
7072 spin_lock(&pers_lock);
2604b703
N
7073 list_for_each_entry(pers, &pers_list, list)
7074 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT
7075
7076 spin_unlock(&pers_lock);
7077 seq_printf(seq, "\n");
f1514638 7078 seq->poll_event = atomic_read(&md_event_count);
1da177e4
LT
7079 return 0;
7080 }
7081 if (v == (void*)2) {
7082 status_unused(seq);
7083 return 0;
7084 }
7085
5dc5cf7d 7086 if (mddev_lock(mddev) < 0)
1da177e4 7087 return -EINTR;
5dc5cf7d 7088
1da177e4
LT
7089 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7090 seq_printf(seq, "%s : %sactive", mdname(mddev),
7091 mddev->pers ? "" : "in");
7092 if (mddev->pers) {
f91de92e 7093 if (mddev->ro==1)
1da177e4 7094 seq_printf(seq, " (read-only)");
f91de92e 7095 if (mddev->ro==2)
52720ae7 7096 seq_printf(seq, " (auto-read-only)");
1da177e4
LT
7097 seq_printf(seq, " %s", mddev->pers->name);
7098 }
7099
dd8ac336 7100 sectors = 0;
dafb20fa 7101 rdev_for_each(rdev, mddev) {
1da177e4
LT
7102 char b[BDEVNAME_SIZE];
7103 seq_printf(seq, " %s[%d]",
7104 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N
7105 if (test_bit(WriteMostly, &rdev->flags))
7106 seq_printf(seq, "(W)");
b2d444d7 7107 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT
7108 seq_printf(seq, "(F)");
7109 continue;
2d78f8c4
N
7110 }
7111 if (rdev->raid_disk < 0)
b325a32e 7112 seq_printf(seq, "(S)"); /* spare */
2d78f8c4
N
7113 if (test_bit(Replacement, &rdev->flags))
7114 seq_printf(seq, "(R)");
dd8ac336 7115 sectors += rdev->sectors;
1da177e4
LT
7116 }
7117
7118 if (!list_empty(&mddev->disks)) {
7119 if (mddev->pers)
7120 seq_printf(seq, "\n %llu blocks",
f233ea5c
AN
7121 (unsigned long long)
7122 mddev->array_sectors / 2);
1da177e4
LT
7123 else
7124 seq_printf(seq, "\n %llu blocks",
dd8ac336 7125 (unsigned long long)sectors / 2);
1da177e4 7126 }
1cd6bf19
N
7127 if (mddev->persistent) {
7128 if (mddev->major_version != 0 ||
7129 mddev->minor_version != 90) {
7130 seq_printf(seq," super %d.%d",
7131 mddev->major_version,
7132 mddev->minor_version);
7133 }
e691063a
N
7134 } else if (mddev->external)
7135 seq_printf(seq, " super external:%s",
7136 mddev->metadata_type);
7137 else
1cd6bf19 7138 seq_printf(seq, " super non-persistent");
1da177e4
LT
7139
7140 if (mddev->pers) {
d710e138 7141 mddev->pers->status(seq, mddev);
1da177e4 7142 seq_printf(seq, "\n ");
8e1b39d6
N
7143 if (mddev->pers->sync_request) {
7144 if (mddev->curr_resync > 2) {
d710e138 7145 status_resync(seq, mddev);
8e1b39d6 7146 seq_printf(seq, "\n ");
72f36d59 7147 } else if (mddev->curr_resync >= 1)
8e1b39d6
N
7148 seq_printf(seq, "\tresync=DELAYED\n ");
7149 else if (mddev->recovery_cp < MaxSector)
7150 seq_printf(seq, "\tresync=PENDING\n ");
7151 }
32a7627c
N
7152 } else
7153 seq_printf(seq, "\n ");
7154
57148964 7155 bitmap_status(seq, mddev->bitmap);
1da177e4
LT
7156
7157 seq_printf(seq, "\n");
7158 }
7159 mddev_unlock(mddev);
7160
7161 return 0;
7162}
7163
110518bc 7164static const struct seq_operations md_seq_ops = {
1da177e4
LT
7165 .start = md_seq_start,
7166 .next = md_seq_next,
7167 .stop = md_seq_stop,
7168 .show = md_seq_show,
7169};
7170
7171static int md_seq_open(struct inode *inode, struct file *file)
7172{
f1514638 7173 struct seq_file *seq;
1da177e4
LT
7174 int error;
7175
7176 error = seq_open(file, &md_seq_ops);
d7603b7e 7177 if (error)
f1514638
KS
7178 return error;
7179
7180 seq = file->private_data;
7181 seq->poll_event = atomic_read(&md_event_count);
1da177e4
LT
7182 return error;
7183}
7184
d7603b7e
N
7185static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7186{
f1514638 7187 struct seq_file *seq = filp->private_data;
d7603b7e
N
7188 int mask;
7189
7190 poll_wait(filp, &md_event_waiters, wait);
7191
7192 /* always allow read */
7193 mask = POLLIN | POLLRDNORM;
7194
f1514638 7195 if (seq->poll_event != atomic_read(&md_event_count))
d7603b7e
N
7196 mask |= POLLERR | POLLPRI;
7197 return mask;
7198}
7199
fa027c2a 7200static const struct file_operations md_seq_fops = {
e24650c2 7201 .owner = THIS_MODULE,
1da177e4
LT
7202 .open = md_seq_open,
7203 .read = seq_read,
7204 .llseek = seq_lseek,
c3f94b40 7205 .release = seq_release_private,
d7603b7e 7206 .poll = mdstat_poll,
1da177e4
LT
7207};
7208
84fc4b56 7209int register_md_personality(struct md_personality *p)
1da177e4 7210{
1da177e4 7211 spin_lock(&pers_lock);
2604b703
N
7212 list_add_tail(&p->list, &pers_list);
7213 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
1da177e4
LT
7214 spin_unlock(&pers_lock);
7215 return 0;
7216}
7217
84fc4b56 7218int unregister_md_personality(struct md_personality *p)
1da177e4 7219{
2604b703 7220 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 7221 spin_lock(&pers_lock);
2604b703 7222 list_del_init(&p->list);
1da177e4
LT
7223 spin_unlock(&pers_lock);
7224 return 0;
7225}
7226
fd01b88c 7227static int is_mddev_idle(struct mddev *mddev, int init)
1da177e4 7228{
3cb03002 7229 struct md_rdev * rdev;
1da177e4 7230 int idle;
eea1bf38 7231 int curr_events;
1da177e4
LT
7232
7233 idle = 1;
4b80991c
N
7234 rcu_read_lock();
7235 rdev_for_each_rcu(rdev, mddev) {
1da177e4 7236 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
eea1bf38
N
7237 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7238 (int)part_stat_read(&disk->part0, sectors[1]) -
7239 atomic_read(&disk->sync_io);
713f6ab1
N
7240 /* sync IO will cause sync_io to increase before the disk_stats
7241 * as sync_io is counted when a request starts, and
7242 * disk_stats is counted when it completes.
7243 * So resync activity will cause curr_events to be smaller than
7244 * when there was no such activity.
7245 * non-sync IO will cause disk_stat to increase without
7246 * increasing sync_io so curr_events will (eventually)
7247 * be larger than it was before. Once it becomes
7248 * substantially larger, the test below will cause
7249 * the array to appear non-idle, and resync will slow
7250 * down.
7251 * If there is a lot of outstanding resync activity when
7252 * we set last_event to curr_events, then all that activity
7253 * completing might cause the array to appear non-idle
7254 * and resync will be slowed down even though there might
7255 * not have been non-resync activity. This will only
7256 * happen once though. 'last_events' will soon reflect
7257 * the state where there is little or no outstanding
7258 * resync requests, and further resync activity will
7259 * always make curr_events less than last_events.
c0e48521 7260 *
1da177e4 7261 */
eea1bf38 7262 if (init || curr_events - rdev->last_events > 64) {
1da177e4
LT
7263 rdev->last_events = curr_events;
7264 idle = 0;
7265 }
7266 }
4b80991c 7267 rcu_read_unlock();
1da177e4
LT
7268 return idle;
7269}
7270
fd01b88c 7271void md_done_sync(struct mddev *mddev, int blocks, int ok)
1da177e4
LT
7272{
7273 /* another "blocks" (512byte) blocks have been synced */
7274 atomic_sub(blocks, &mddev->recovery_active);
7275 wake_up(&mddev->recovery_wait);
7276 if (!ok) {
dfc70645 7277 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
0a19caab 7278 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
1da177e4
LT
7279 md_wakeup_thread(mddev->thread);
7280 // stop recovery, signal do_sync ....
7281 }
7282}
7283
7284
06d91a5f
N
7285/* md_write_start(mddev, bi)
7286 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N
7287 * in superblock) before writing, schedule a superblock update
7288 * and wait for it to complete.
06d91a5f 7289 */
fd01b88c 7290void md_write_start(struct mddev *mddev, struct bio *bi)
1da177e4 7291{
0fd62b86 7292 int did_change = 0;
06d91a5f 7293 if (bio_data_dir(bi) != WRITE)
3d310eb7 7294 return;
06d91a5f 7295
f91de92e
N
7296 BUG_ON(mddev->ro == 1);
7297 if (mddev->ro == 2) {
7298 /* need to switch to read/write */
7299 mddev->ro = 0;
7300 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7301 md_wakeup_thread(mddev->thread);
25156198 7302 md_wakeup_thread(mddev->sync_thread);
0fd62b86 7303 did_change = 1;
f91de92e 7304 }
06d91a5f 7305 atomic_inc(&mddev->writes_pending);
31a59e34
N
7306 if (mddev->safemode == 1)
7307 mddev->safemode = 0;
06d91a5f 7308 if (mddev->in_sync) {
a9701a30 7309 spin_lock_irq(&mddev->write_lock);
3d310eb7
N
7310 if (mddev->in_sync) {
7311 mddev->in_sync = 0;
850b2b42 7312 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
070dc6dd 7313 set_bit(MD_CHANGE_PENDING, &mddev->flags);
3d310eb7 7314 md_wakeup_thread(mddev->thread);
0fd62b86 7315 did_change = 1;
3d310eb7 7316 }
a9701a30 7317 spin_unlock_irq(&mddev->write_lock);
06d91a5f 7318 }
0fd62b86 7319 if (did_change)
00bcb4ac 7320 sysfs_notify_dirent_safe(mddev->sysfs_state);
09a44cc1 7321 wait_event(mddev->sb_wait,
09a44cc1 7322 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
1da177e4
LT
7323}
7324
fd01b88c 7325void md_write_end(struct mddev *mddev)
1da177e4
LT
7326{
7327 if (atomic_dec_and_test(&mddev->writes_pending)) {
7328 if (mddev->safemode == 2)
7329 md_wakeup_thread(mddev->thread);
16f17b39 7330 else if (mddev->safemode_delay)
1da177e4
LT
7331 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7332 }
7333}
7334
2a2275d6
N
7335/* md_allow_write(mddev)
7336 * Calling this ensures that the array is marked 'active' so that writes
7337 * may proceed without blocking. It is important to call this before
7338 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7339 * Must be called with mddev_lock held.
b5470dc5
DW
7340 *
7341 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7342 * is dropped, so return -EAGAIN after notifying userspace.
2a2275d6 7343 */
fd01b88c 7344int md_allow_write(struct mddev *mddev)
2a2275d6
N
7345{
7346 if (!mddev->pers)
b5470dc5 7347 return 0;
2a2275d6 7348 if (mddev->ro)
b5470dc5 7349 return 0;
1a0fd497 7350 if (!mddev->pers->sync_request)
b5470dc5 7351 return 0;
2a2275d6
N
7352
7353 spin_lock_irq(&mddev->write_lock);
7354 if (mddev->in_sync) {
7355 mddev->in_sync = 0;
7356 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
070dc6dd 7357 set_bit(MD_CHANGE_PENDING, &mddev->flags);
2a2275d6
N
7358 if (mddev->safemode_delay &&
7359 mddev->safemode == 0)
7360 mddev->safemode = 1;
7361 spin_unlock_irq(&mddev->write_lock);
7362 md_update_sb(mddev, 0);
00bcb4ac 7363 sysfs_notify_dirent_safe(mddev->sysfs_state);
2a2275d6
N
7364 } else
7365 spin_unlock_irq(&mddev->write_lock);
b5470dc5 7366
070dc6dd 7367 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
b5470dc5
DW
7368 return -EAGAIN;
7369 else
7370 return 0;
2a2275d6
N
7371}
7372EXPORT_SYMBOL_GPL(md_allow_write);
7373
1da177e4
LT
7374#define SYNC_MARKS 10
7375#define SYNC_MARK_STEP (3*HZ)
54f89341 7376#define UPDATE_FREQUENCY (5*60*HZ)
4ed8731d 7377void md_do_sync(struct md_thread *thread)
1da177e4 7378{
4ed8731d 7379 struct mddev *mddev = thread->mddev;
fd01b88c 7380 struct mddev *mddev2;
1da177e4
LT
7381 unsigned int currspeed = 0,
7382 window;
57afd89f 7383 sector_t max_sectors,j, io_sectors;
1da177e4 7384 unsigned long mark[SYNC_MARKS];
54f89341 7385 unsigned long update_time;
1da177e4
LT
7386 sector_t mark_cnt[SYNC_MARKS];
7387 int last_mark,m;
7388 struct list_head *tmp;
7389 sector_t last_check;
57afd89f 7390 int skipped = 0;
3cb03002 7391 struct md_rdev *rdev;
c4a39551 7392 char *desc, *action = NULL;
7c2c57c9 7393 struct blk_plug plug;
1da177e4
LT
7394
7395 /* just incase thread restarts... */
7396 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7397 return;
5fd6c1dc
N
7398 if (mddev->ro) /* never try to sync a read-only array */
7399 return;
1da177e4 7400
61df9d91 7401 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
c4a39551 7402 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
61df9d91 7403 desc = "data-check";
c4a39551
JB
7404 action = "check";
7405 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
61df9d91 7406 desc = "requested-resync";
c4a39551
JB
7407 action = "repair";
7408 } else
61df9d91
N
7409 desc = "resync";
7410 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7411 desc = "reshape";
7412 else
7413 desc = "recovery";
7414
c4a39551
JB
7415 mddev->last_sync_action = action ?: desc;
7416
1da177e4
LT
7417 /* we overload curr_resync somewhat here.
7418 * 0 == not engaged in resync at all
7419 * 2 == checking that there is no conflict with another sync
7420 * 1 == like 2, but have yielded to allow conflicting resync to
7421 * commense
7422 * other == active in resync - this many blocks
7423 *
7424 * Before starting a resync we must have set curr_resync to
7425 * 2, and then checked that every "conflicting" array has curr_resync
7426 * less than ours. When we find one that is the same or higher
7427 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7428 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7429 * This will mean we have to start checking from the beginning again.
7430 *
7431 */
7432
7433 do {
7434 mddev->curr_resync = 2;
7435
7436 try_again:
404e4b43 7437 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
1da177e4 7438 goto skip;
29ac4aa3 7439 for_each_mddev(mddev2, tmp) {
1da177e4
LT
7440 if (mddev2 == mddev)
7441 continue;
90b08710
BS
7442 if (!mddev->parallel_resync
7443 && mddev2->curr_resync
7444 && match_mddev_units(mddev, mddev2)) {
1da177e4
LT
7445 DEFINE_WAIT(wq);
7446 if (mddev < mddev2 && mddev->curr_resync == 2) {
7447 /* arbitrarily yield */
7448 mddev->curr_resync = 1;
7449 wake_up(&resync_wait);
7450 }
7451 if (mddev > mddev2 && mddev->curr_resync == 1)
7452 /* no need to wait here, we can wait the next
7453 * time 'round when curr_resync == 2
7454 */
7455 continue;
9744197c
N
7456 /* We need to wait 'interruptible' so as not to
7457 * contribute to the load average, and not to
7458 * be caught by 'softlockup'
7459 */
7460 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
c91abf5a 7461 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8712e553 7462 mddev2->curr_resync >= mddev->curr_resync) {
61df9d91
N
7463 printk(KERN_INFO "md: delaying %s of %s"
7464 " until %s has finished (they"
1da177e4 7465 " share one or more physical units)\n",
61df9d91 7466 desc, mdname(mddev), mdname(mddev2));
1da177e4 7467 mddev_put(mddev2);
9744197c
N
7468 if (signal_pending(current))
7469 flush_signals(current);
1da177e4
LT
7470 schedule();
7471 finish_wait(&resync_wait, &wq);
7472 goto try_again;
7473 }
7474 finish_wait(&resync_wait, &wq);
7475 }
7476 }
7477 } while (mddev->curr_resync < 2);
7478
5fd6c1dc 7479 j = 0;
9d88883e 7480 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 7481 /* resync follows the size requested by the personality,
57afd89f 7482 * which defaults to physical size, but can be virtual size
1da177e4
LT
7483 */
7484 max_sectors = mddev->resync_max_sectors;
7f7583d4 7485 atomic64_set(&mddev->resync_mismatches, 0);
5fd6c1dc 7486 /* we don't use the checkpoint if there's a bitmap */
5e96ee65
NB
7487 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7488 j = mddev->resync_min;
7489 else if (!mddev->bitmap)
5fd6c1dc 7490 j = mddev->recovery_cp;
5e96ee65 7491
ccfcc3c1 7492 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
c804cdec 7493 max_sectors = mddev->resync_max_sectors;
5fd6c1dc 7494 else {
1da177e4 7495 /* recovery follows the physical size of devices */
58c0fed4 7496 max_sectors = mddev->dev_sectors;
5fd6c1dc 7497 j = MaxSector;
4e59ca7d 7498 rcu_read_lock();
dafb20fa 7499 rdev_for_each_rcu(rdev, mddev)
5fd6c1dc
N
7500 if (rdev->raid_disk >= 0 &&
7501 !test_bit(Faulty, &rdev->flags) &&
7502 !test_bit(In_sync, &rdev->flags) &&
7503 rdev->recovery_offset < j)
7504 j = rdev->recovery_offset;
4e59ca7d 7505 rcu_read_unlock();
5fd6c1dc 7506 }
1da177e4 7507
61df9d91
N
7508 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
7509 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
7510 " %d KB/sec/disk.\n", speed_min(mddev));
338cec32 7511 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
61df9d91
N
7512 "(but not more than %d KB/sec) for %s.\n",
7513 speed_max(mddev), desc);
1da177e4 7514
eea1bf38 7515 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
5fd6c1dc 7516
57afd89f 7517 io_sectors = 0;
1da177e4
LT
7518 for (m = 0; m < SYNC_MARKS; m++) {
7519 mark[m] = jiffies;
57afd89f 7520 mark_cnt[m] = io_sectors;
1da177e4
LT
7521 }
7522 last_mark = 0;
7523 mddev->resync_mark = mark[last_mark];
7524 mddev->resync_mark_cnt = mark_cnt[last_mark];
7525
7526 /*
7527 * Tune reconstruction:
7528 */
7529 window = 32*(PAGE_SIZE/512);
ac42450c
JB
7530 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
7531 window/2, (unsigned long long)max_sectors/2);
1da177e4
LT
7532
7533 atomic_set(&mddev->recovery_active, 0);
1da177e4
LT
7534 last_check = 0;
7535
7536 if (j>2) {
c91abf5a 7537 printk(KERN_INFO
61df9d91
N
7538 "md: resuming %s of %s from checkpoint.\n",
7539 desc, mdname(mddev));
1da177e4 7540 mddev->curr_resync = j;
72f36d59
N
7541 } else
7542 mddev->curr_resync = 3; /* no longer delayed */
75d3da43 7543 mddev->curr_resync_completed = j;
72f36d59
N
7544 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7545 md_new_event(mddev);
54f89341 7546 update_time = jiffies;
1da177e4 7547
7c2c57c9 7548 blk_start_plug(&plug);
1da177e4 7549 while (j < max_sectors) {
57afd89f 7550 sector_t sectors;
1da177e4 7551
57afd89f 7552 skipped = 0;
97e4f42d 7553
7a91ee1f
N
7554 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7555 ((mddev->curr_resync > mddev->curr_resync_completed &&
7556 (mddev->curr_resync - mddev->curr_resync_completed)
7557 > (max_sectors >> 4)) ||
54f89341 7558 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
7a91ee1f
N
7559 (j - mddev->curr_resync_completed)*2
7560 >= mddev->resync_max - mddev->curr_resync_completed
7561 )) {
97e4f42d 7562 /* time to update curr_resync_completed */
97e4f42d
N
7563 wait_event(mddev->recovery_wait,
7564 atomic_read(&mddev->recovery_active) == 0);
75d3da43 7565 mddev->curr_resync_completed = j;
35d78c66 7566 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
7567 j > mddev->recovery_cp)
7568 mddev->recovery_cp = j;
54f89341 7569 update_time = jiffies;
070dc6dd 7570 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
acb180b0 7571 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
97e4f42d 7572 }
acb180b0 7573
c91abf5a
N
7574 while (j >= mddev->resync_max &&
7575 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
e62e58a5
N
7576 /* As this condition is controlled by user-space,
7577 * we can block indefinitely, so use '_interruptible'
7578 * to avoid triggering warnings.
7579 */
7580 flush_signals(current); /* just in case */
7581 wait_event_interruptible(mddev->recovery_wait,
7582 mddev->resync_max > j
c91abf5a
N
7583 || test_bit(MD_RECOVERY_INTR,
7584 &mddev->recovery));
e62e58a5 7585 }
acb180b0 7586
c91abf5a
N
7587 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7588 break;
acb180b0 7589
57afd89f 7590 sectors = mddev->pers->sync_request(mddev, j, &skipped,
c6207277 7591 currspeed < speed_min(mddev));
57afd89f 7592 if (sectors == 0) {
dfc70645 7593 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
c91abf5a 7594 break;
1da177e4 7595 }
57afd89f
N
7596
7597 if (!skipped) { /* actual IO requested */
7598 io_sectors += sectors;
7599 atomic_add(sectors, &mddev->recovery_active);
7600 }
7601
e875ecea
N
7602 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7603 break;
7604
1da177e4 7605 j += sectors;
72f36d59
N
7606 if (j > 2)
7607 mddev->curr_resync = j;
ff4e8d9a 7608 mddev->curr_mark_cnt = io_sectors;
d7603b7e 7609 if (last_check == 0)
e875ecea 7610 /* this is the earliest that rebuild will be
d7603b7e
N
7611 * visible in /proc/mdstat
7612 */
7613 md_new_event(mddev);
57afd89f
N
7614
7615 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT
7616 continue;
7617
57afd89f 7618 last_check = io_sectors;
1da177e4
LT
7619 repeat:
7620 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
7621 /* step marks */
7622 int next = (last_mark+1) % SYNC_MARKS;
7623
7624 mddev->resync_mark = mark[next];
7625 mddev->resync_mark_cnt = mark_cnt[next];
7626 mark[next] = jiffies;
57afd89f 7627 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT
7628 last_mark = next;
7629 }
7630
c91abf5a
N
7631 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7632 break;
1da177e4
LT
7633
7634 /*
7635 * this loop exits only if either when we are slower than
7636 * the 'hard' speed limit, or the system was IO-idle for
7637 * a jiffy.
7638 * the system might be non-idle CPU-wise, but we only care
7639 * about not overloading the IO subsystem. (things like an
7640 * e2fsck being done on the RAID array should execute fast)
7641 */
1da177e4
LT
7642 cond_resched();
7643
57afd89f
N
7644 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
7645 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4 7646
88202a0c
N
7647 if (currspeed > speed_min(mddev)) {
7648 if ((currspeed > speed_max(mddev)) ||
eea1bf38 7649 !is_mddev_idle(mddev, 0)) {
c0e48521 7650 msleep(500);
1da177e4
LT
7651 goto repeat;
7652 }
7653 }
7654 }
c91abf5a
N
7655 printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc,
7656 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
7657 ? "interrupted" : "done");
1da177e4
LT
7658 /*
7659 * this also signals 'finished resyncing' to md_stop
7660 */
7c2c57c9 7661 blk_finish_plug(&plug);
1da177e4
LT
7662 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
7663
7664 /* tell personality that we are finished */
57afd89f 7665 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4 7666
dfc70645 7667 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5fd6c1dc
N
7668 mddev->curr_resync > 2) {
7669 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7670 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7671 if (mddev->curr_resync >= mddev->recovery_cp) {
7672 printk(KERN_INFO
61df9d91
N
7673 "md: checkpointing %s of %s.\n",
7674 desc, mdname(mddev));
0a19caab 7675 if (test_bit(MD_RECOVERY_ERROR,
7676 &mddev->recovery))
7677 mddev->recovery_cp =
7678 mddev->curr_resync_completed;
7679 else
7680 mddev->recovery_cp =
7681 mddev->curr_resync;
5fd6c1dc
N
7682 }
7683 } else
7684 mddev->recovery_cp = MaxSector;
7685 } else {
7686 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7687 mddev->curr_resync = MaxSector;
4e59ca7d 7688 rcu_read_lock();
dafb20fa 7689 rdev_for_each_rcu(rdev, mddev)
5fd6c1dc 7690 if (rdev->raid_disk >= 0 &&
70fffd0b 7691 mddev->delta_disks >= 0 &&
5fd6c1dc
N
7692 !test_bit(Faulty, &rdev->flags) &&
7693 !test_bit(In_sync, &rdev->flags) &&
7694 rdev->recovery_offset < mddev->curr_resync)
7695 rdev->recovery_offset = mddev->curr_resync;
4e59ca7d 7696 rcu_read_unlock();
5fd6c1dc 7697 }
1da177e4 7698 }
db91ff55 7699 skip:
17571284 7700 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 7701
c07b70ad
N
7702 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7703 /* We completed so min/max setting can be forgotten if used. */
7704 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7705 mddev->resync_min = 0;
7706 mddev->resync_max = MaxSector;
7707 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7708 mddev->resync_min = mddev->curr_resync_completed;
1da177e4
LT
7709 mddev->curr_resync = 0;
7710 wake_up(&resync_wait);
7711 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
7712 md_wakeup_thread(mddev->thread);
c6207277 7713 return;
1da177e4 7714}
29269553 7715EXPORT_SYMBOL_GPL(md_do_sync);
1da177e4 7716
746d3207
N
7717static int remove_and_add_spares(struct mddev *mddev,
7718 struct md_rdev *this)
b4c4c7b8 7719{
3cb03002 7720 struct md_rdev *rdev;
b4c4c7b8 7721 int spares = 0;
f2a371c5 7722 int removed = 0;
b4c4c7b8 7723
dafb20fa 7724 rdev_for_each(rdev, mddev)
746d3207
N
7725 if ((this == NULL || rdev == this) &&
7726 rdev->raid_disk >= 0 &&
6bfe0b49 7727 !test_bit(Blocked, &rdev->flags) &&
b4c4c7b8
N
7728 (test_bit(Faulty, &rdev->flags) ||
7729 ! test_bit(In_sync, &rdev->flags)) &&
7730 atomic_read(&rdev->nr_pending)==0) {
7731 if (mddev->pers->hot_remove_disk(
b8321b68 7732 mddev, rdev) == 0) {
36fad858 7733 sysfs_unlink_rdev(mddev, rdev);
b4c4c7b8 7734 rdev->raid_disk = -1;
f2a371c5 7735 removed++;
b4c4c7b8
N
7736 }
7737 }
90584fc9
JB
7738 if (removed && mddev->kobj.sd)
7739 sysfs_notify(&mddev->kobj, NULL, "degraded");
b4c4c7b8 7740
746d3207
N
7741 if (this)
7742 goto no_add;
7743
dafb20fa 7744 rdev_for_each(rdev, mddev) {
7bfec5f3
N
7745 if (rdev->raid_disk >= 0 &&
7746 !test_bit(In_sync, &rdev->flags) &&
7747 !test_bit(Faulty, &rdev->flags))
7748 spares++;
7ceb17e8
N
7749 if (rdev->raid_disk >= 0)
7750 continue;
7751 if (test_bit(Faulty, &rdev->flags))
7752 continue;
7753 if (mddev->ro &&
8313b8e5
N
7754 ! (rdev->saved_raid_disk >= 0 &&
7755 !test_bit(Bitmap_sync, &rdev->flags)))
7ceb17e8
N
7756 continue;
7757
7eb41885
N
7758 if (rdev->saved_raid_disk < 0)
7759 rdev->recovery_offset = 0;
7ceb17e8
N
7760 if (mddev->pers->
7761 hot_add_disk(mddev, rdev) == 0) {
7762 if (sysfs_link_rdev(mddev, rdev))
7763 /* failure here is OK */;
7764 spares++;
7765 md_new_event(mddev);
7766 set_bit(MD_CHANGE_DEVS, &mddev->flags);
dfc70645 7767 }
b4c4c7b8 7768 }
746d3207 7769no_add:
6dafab6b
N
7770 if (removed)
7771 set_bit(MD_CHANGE_DEVS, &mddev->flags);
b4c4c7b8
N
7772 return spares;
7773}
7ebc0be7 7774
1da177e4
LT
7775/*
7776 * This routine is regularly called by all per-raid-array threads to
7777 * deal with generic issues like resync and super-block update.
7778 * Raid personalities that don't have a thread (linear/raid0) do not
7779 * need this as they never do any recovery or update the superblock.
7780 *
7781 * It does not do any resync itself, but rather "forks" off other threads
7782 * to do that as needed.
7783 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7784 * "->recovery" and create a thread at ->sync_thread.
dfc70645 7785 * When the thread finishes it sets MD_RECOVERY_DONE
1da177e4
LT
7786 * and wakeups up this thread which will reap the thread and finish up.
7787 * This thread also removes any faulty devices (with nr_pending == 0).
7788 *
7789 * The overall approach is:
7790 * 1/ if the superblock needs updating, update it.
7791 * 2/ If a recovery thread is running, don't do anything else.
7792 * 3/ If recovery has finished, clean up, possibly marking spares active.
7793 * 4/ If there are any faulty devices, remove them.
7794 * 5/ If array is degraded, try to add spares devices
7795 * 6/ If array has spares or is not in-sync, start a resync thread.
7796 */
fd01b88c 7797void md_check_recovery(struct mddev *mddev)
1da177e4 7798{
68866e42
JB
7799 if (mddev->suspended)
7800 return;
7801
5f40402d 7802 if (mddev->bitmap)
aa5cbd10 7803 bitmap_daemon_work(mddev);
1da177e4 7804
fca4d848 7805 if (signal_pending(current)) {
31a59e34 7806 if (mddev->pers->sync_request && !mddev->external) {
fca4d848
N
7807 printk(KERN_INFO "md: %s in immediate safe mode\n",
7808 mdname(mddev));
7809 mddev->safemode = 2;
7810 }
7811 flush_signals(current);
7812 }
7813
c89a8eee
N
7814 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
7815 return;
1da177e4 7816 if ( ! (
142d44c3 7817 (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
1da177e4 7818 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848 7819 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
31a59e34 7820 (mddev->external == 0 && mddev->safemode == 1) ||
fca4d848
N
7821 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
7822 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT
7823 ))
7824 return;
fca4d848 7825
df5b89b3 7826 if (mddev_trylock(mddev)) {
b4c4c7b8 7827 int spares = 0;
fca4d848 7828
c89a8eee 7829 if (mddev->ro) {
7ceb17e8
N
7830 /* On a read-only array we can:
7831 * - remove failed devices
7832 * - add already-in_sync devices if the array itself
7833 * is in-sync.
7834 * As we only add devices that are already in-sync,
7835 * we can activate the spares immediately.
c89a8eee 7836 */
7ceb17e8 7837 remove_and_add_spares(mddev, NULL);
8313b8e5
N
7838 /* There is no thread, but we need to call
7839 * ->spare_active and clear saved_raid_disk
7840 */
7841 md_reap_sync_thread(mddev);
7842 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
c89a8eee
N
7843 goto unlock;
7844 }
7845
31a59e34 7846 if (!mddev->external) {
0fd62b86 7847 int did_change = 0;
31a59e34
N
7848 spin_lock_irq(&mddev->write_lock);
7849 if (mddev->safemode &&
7850 !atomic_read(&mddev->writes_pending) &&
7851 !mddev->in_sync &&
7852 mddev->recovery_cp == MaxSector) {
7853 mddev->in_sync = 1;
0fd62b86 7854 did_change = 1;
070dc6dd 7855 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
31a59e34
N
7856 }
7857 if (mddev->safemode == 1)
7858 mddev->safemode = 0;
7859 spin_unlock_irq(&mddev->write_lock);
0fd62b86 7860 if (did_change)
00bcb4ac 7861 sysfs_notify_dirent_safe(mddev->sysfs_state);
fca4d848 7862 }
fca4d848 7863
7a0a5355 7864 if (mddev->flags & MD_UPDATE_SB_FLAGS)
850b2b42 7865 md_update_sb(mddev, 0);
06d91a5f 7866
1da177e4
LT
7867 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7868 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7869 /* resync/recovery still happening */
7870 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7871 goto unlock;
7872 }
7873 if (mddev->sync_thread) {
a91d5ac0 7874 md_reap_sync_thread(mddev);
1da177e4
LT
7875 goto unlock;
7876 }
72a23c21
NB
7877 /* Set RUNNING before clearing NEEDED to avoid
7878 * any transients in the value of "sync_action".
7879 */
72f36d59 7880 mddev->curr_resync_completed = 0;
72a23c21 7881 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
24dd469d
N
7882 /* Clear some bits that don't mean anything, but
7883 * might be left set
7884 */
24dd469d
N
7885 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7886 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4 7887
ed209584
N
7888 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7889 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5fd6c1dc 7890 goto unlock;
1da177e4
LT
7891 /* no recovery is running.
7892 * remove any failed drives, then
7893 * add spares if possible.
72f36d59 7894 * Spares are also removed and re-added, to allow
1da177e4
LT
7895 * the personality to fail the re-add.
7896 */
1da177e4 7897
b4c4c7b8 7898 if (mddev->reshape_position != MaxSector) {
50ac168a
N
7899 if (mddev->pers->check_reshape == NULL ||
7900 mddev->pers->check_reshape(mddev) != 0)
b4c4c7b8
N
7901 /* Cannot proceed */
7902 goto unlock;
7903 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
72a23c21 7904 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
746d3207 7905 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
24dd469d
N
7906 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7907 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
56ac36d7 7908 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
72a23c21 7909 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
24dd469d
N
7910 } else if (mddev->recovery_cp < MaxSector) {
7911 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
72a23c21 7912 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
24dd469d
N
7913 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7914 /* nothing to be done ... */
1da177e4 7915 goto unlock;
24dd469d 7916
1da177e4 7917 if (mddev->pers->sync_request) {
ef99bf48 7918 if (spares) {
a654b9d8
N
7919 /* We are adding a device or devices to an array
7920 * which has the bitmap stored on all devices.
7921 * So make sure all bitmap pages get written
7922 */
7923 bitmap_write_all(mddev->bitmap);
7924 }
1da177e4
LT
7925 mddev->sync_thread = md_register_thread(md_do_sync,
7926 mddev,
0da3c619 7927 "resync");
1da177e4
LT
7928 if (!mddev->sync_thread) {
7929 printk(KERN_ERR "%s: could not start resync"
7930 " thread...\n",
7931 mdname(mddev));
7932 /* leave the spares where they are, it shouldn't hurt */
7ebc0be7
N
7933 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7934 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7935 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7936 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7937 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
d7603b7e 7938 } else
1da177e4 7939 md_wakeup_thread(mddev->sync_thread);
00bcb4ac 7940 sysfs_notify_dirent_safe(mddev->sysfs_action);
d7603b7e 7941 md_new_event(mddev);
1da177e4
LT
7942 }
7943 unlock:
90f5f7ad
HR
7944 wake_up(&mddev->sb_wait);
7945
72a23c21
NB
7946 if (!mddev->sync_thread) {
7947 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7948 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7949 &mddev->recovery))
0c3573f1 7950 if (mddev->sysfs_action)
00bcb4ac 7951 sysfs_notify_dirent_safe(mddev->sysfs_action);
72a23c21 7952 }
1da177e4
LT
7953 mddev_unlock(mddev);
7954 }
7955}
7956
a91d5ac0
JB
7957void md_reap_sync_thread(struct mddev *mddev)
7958{
7959 struct md_rdev *rdev;
7960
7961 /* resync has finished, collect result */
7962 md_unregister_thread(&mddev->sync_thread);
30b8feb7 7963 wake_up(&resync_wait);
a91d5ac0
JB
7964 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7965 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7966 /* success...*/
7967 /* activate any spares */
7968 if (mddev->pers->spare_active(mddev)) {
7969 sysfs_notify(&mddev->kobj, NULL,
7970 "degraded");
7971 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7972 }
7973 }
7974 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7975 mddev->pers->finish_reshape)
7976 mddev->pers->finish_reshape(mddev);
7977
7978 /* If array is no-longer degraded, then any saved_raid_disk
f466722c 7979 * information must be scrapped.
a91d5ac0 7980 */
f466722c
N
7981 if (!mddev->degraded)
7982 rdev_for_each(rdev, mddev)
a91d5ac0
JB
7983 rdev->saved_raid_disk = -1;
7984
7985 md_update_sb(mddev, 1);
7986 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7987 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7988 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7989 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7990 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7991 /* flag recovery needed just to double check */
7992 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7993 sysfs_notify_dirent_safe(mddev->sysfs_action);
7994 md_new_event(mddev);
7995 if (mddev->event_work.func)
7996 queue_work(md_misc_wq, &mddev->event_work);
7997}
7998
fd01b88c 7999void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
6bfe0b49 8000{
00bcb4ac 8001 sysfs_notify_dirent_safe(rdev->sysfs_state);
6bfe0b49 8002 wait_event_timeout(rdev->blocked_wait,
de393cde
N
8003 !test_bit(Blocked, &rdev->flags) &&
8004 !test_bit(BlockedBadBlocks, &rdev->flags),
6bfe0b49
DW
8005 msecs_to_jiffies(5000));
8006 rdev_dec_pending(rdev, mddev);
8007}
8008EXPORT_SYMBOL(md_wait_for_blocked_rdev);
8009
c6563a8c
N
8010void md_finish_reshape(struct mddev *mddev)
8011{
8012 /* called be personality module when reshape completes. */
8013 struct md_rdev *rdev;
8014
8015 rdev_for_each(rdev, mddev) {
8016 if (rdev->data_offset > rdev->new_data_offset)
8017 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
8018 else
8019 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
8020 rdev->data_offset = rdev->new_data_offset;
8021 }
8022}
8023EXPORT_SYMBOL(md_finish_reshape);
2230dfe4
N
8024
8025/* Bad block management.
8026 * We can record which blocks on each device are 'bad' and so just
8027 * fail those blocks, or that stripe, rather than the whole device.
8028 * Entries in the bad-block table are 64bits wide. This comprises:
8029 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8030 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8031 * A 'shift' can be set so that larger blocks are tracked and
8032 * consequently larger devices can be covered.
8033 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8034 *
8035 * Locking of the bad-block table uses a seqlock so md_is_badblock
8036 * might need to retry if it is very unlucky.
8037 * We will sometimes want to check for bad blocks in a bi_end_io function,
8038 * so we use the write_seqlock_irq variant.
8039 *
8040 * When looking for a bad block we specify a range and want to
8041 * know if any block in the range is bad. So we binary-search
8042 * to the last range that starts at-or-before the given endpoint,
8043 * (or "before the sector after the target range")
8044 * then see if it ends after the given start.
8045 * We return
8046 * 0 if there are no known bad blocks in the range
8047 * 1 if there are known bad block which are all acknowledged
8048 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8049 * plus the start/length of the first bad section we overlap.
8050 */
8051int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
8052 sector_t *first_bad, int *bad_sectors)
8053{
8054 int hi;
ab05613a 8055 int lo;
2230dfe4 8056 u64 *p = bb->page;
ab05613a 8057 int rv;
2230dfe4
N
8058 sector_t target = s + sectors;
8059 unsigned seq;
8060
8061 if (bb->shift > 0) {
8062 /* round the start down, and the end up */
8063 s >>= bb->shift;
8064 target += (1<<bb->shift) - 1;
8065 target >>= bb->shift;
8066 sectors = target - s;
8067 }
8068 /* 'target' is now the first block after the bad range */
8069
8070retry:
8071 seq = read_seqbegin(&bb->lock);
ab05613a 8072 lo = 0;
8073 rv = 0;
2230dfe4
N
8074 hi = bb->count;
8075
8076 /* Binary search between lo and hi for 'target'
8077 * i.e. for the last range that starts before 'target'
8078 */
8079 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8080 * are known not to be the last range before target.
8081 * VARIANT: hi-lo is the number of possible
8082 * ranges, and decreases until it reaches 1
8083 */
8084 while (hi - lo > 1) {
8085 int mid = (lo + hi) / 2;
8086 sector_t a = BB_OFFSET(p[mid]);
8087 if (a < target)
8088 /* This could still be the one, earlier ranges
8089 * could not. */
8090 lo = mid;
8091 else
8092 /* This and later ranges are definitely out. */
8093 hi = mid;
8094 }
8095 /* 'lo' might be the last that started before target, but 'hi' isn't */
8096 if (hi > lo) {
8097 /* need to check all range that end after 's' to see if
8098 * any are unacknowledged.
8099 */
8100 while (lo >= 0 &&
8101 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8102 if (BB_OFFSET(p[lo]) < target) {
8103 /* starts before the end, and finishes after
8104 * the start, so they must overlap
8105 */
8106 if (rv != -1 && BB_ACK(p[lo]))
8107 rv = 1;
8108 else
8109 rv = -1;
8110 *first_bad = BB_OFFSET(p[lo]);
8111 *bad_sectors = BB_LEN(p[lo]);
8112 }
8113 lo--;
8114 }
8115 }
8116
8117 if (read_seqretry(&bb->lock, seq))
8118 goto retry;
8119
8120 return rv;
8121}
8122EXPORT_SYMBOL_GPL(md_is_badblock);
8123
8124/*
8125 * Add a range of bad blocks to the table.
8126 * This might extend the table, or might contract it
8127 * if two adjacent ranges can be merged.
8128 * We binary-search to find the 'insertion' point, then
8129 * decide how best to handle it.
8130 */
8131static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
8132 int acknowledged)
8133{
8134 u64 *p;
8135 int lo, hi;
8136 int rv = 1;
905b0297 8137 unsigned long flags;
2230dfe4
N
8138
8139 if (bb->shift < 0)
8140 /* badblocks are disabled */
8141 return 0;
8142
8143 if (bb->shift) {
8144 /* round the start down, and the end up */
8145 sector_t next = s + sectors;
8146 s >>= bb->shift;
8147 next += (1<<bb->shift) - 1;
8148 next >>= bb->shift;
8149 sectors = next - s;
8150 }
8151
905b0297 8152 write_seqlock_irqsave(&bb->lock, flags);
2230dfe4
N
8153
8154 p = bb->page;
8155 lo = 0;
8156 hi = bb->count;
8157 /* Find the last range that starts at-or-before 's' */
8158 while (hi - lo > 1) {
8159 int mid = (lo + hi) / 2;
8160 sector_t a = BB_OFFSET(p[mid]);
8161 if (a <= s)
8162 lo = mid;
8163 else
8164 hi = mid;
8165 }
8166 if (hi > lo && BB_OFFSET(p[lo]) > s)
8167 hi = lo;
8168
8169 if (hi > lo) {
8170 /* we found a range that might merge with the start
8171 * of our new range
8172 */
8173 sector_t a = BB_OFFSET(p[lo]);
8174 sector_t e = a + BB_LEN(p[lo]);
8175 int ack = BB_ACK(p[lo]);
8176 if (e >= s) {
8177 /* Yes, we can merge with a previous range */
8178 if (s == a && s + sectors >= e)
8179 /* new range covers old */
8180 ack = acknowledged;
8181 else
8182 ack = ack && acknowledged;
8183
8184 if (e < s + sectors)
8185 e = s + sectors;
8186 if (e - a <= BB_MAX_LEN) {
8187 p[lo] = BB_MAKE(a, e-a, ack);
8188 s = e;
8189 } else {
8190 /* does not all fit in one range,
8191 * make p[lo] maximal
8192 */
8193 if (BB_LEN(p[lo]) != BB_MAX_LEN)
8194 p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
8195 s = a + BB_MAX_LEN;
8196 }
8197 sectors = e - s;
8198 }
8199 }
8200 if (sectors && hi < bb->count) {
8201 /* 'hi' points to the first range that starts after 's'.
8202 * Maybe we can merge with the start of that range */
8203 sector_t a = BB_OFFSET(p[hi]);
8204 sector_t e = a + BB_LEN(p[hi]);
8205 int ack = BB_ACK(p[hi]);
8206 if (a <= s + sectors) {
8207 /* merging is possible */
8208 if (e <= s + sectors) {
8209 /* full overlap */
8210 e = s + sectors;
8211 ack = acknowledged;
8212 } else
8213 ack = ack && acknowledged;
8214
8215 a = s;
8216 if (e - a <= BB_MAX_LEN) {
8217 p[hi] = BB_MAKE(a, e-a, ack);
8218 s = e;
8219 } else {
8220 p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
8221 s = a + BB_MAX_LEN;
8222 }
8223 sectors = e - s;
8224 lo = hi;
8225 hi++;
8226 }
8227 }
8228 if (sectors == 0 && hi < bb->count) {
8229 /* we might be able to combine lo and hi */
8230 /* Note: 's' is at the end of 'lo' */
8231 sector_t a = BB_OFFSET(p[hi]);
8232 int lolen = BB_LEN(p[lo]);
8233 int hilen = BB_LEN(p[hi]);
8234 int newlen = lolen + hilen - (s - a);
8235 if (s >= a && newlen < BB_MAX_LEN) {
8236 /* yes, we can combine them */
8237 int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
8238 p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
8239 memmove(p + hi, p + hi + 1,
8240 (bb->count - hi - 1) * 8);
8241 bb->count--;
8242 }
8243 }
8244 while (sectors) {
8245 /* didn't merge (it all).
8246 * Need to add a range just before 'hi' */
8247 if (bb->count >= MD_MAX_BADBLOCKS) {
8248 /* No room for more */
8249 rv = 0;
8250 break;
8251 } else {
8252 int this_sectors = sectors;
8253 memmove(p + hi + 1, p + hi,
8254 (bb->count - hi) * 8);
8255 bb->count++;
8256
8257 if (this_sectors > BB_MAX_LEN)
8258 this_sectors = BB_MAX_LEN;
8259 p[hi] = BB_MAKE(s, this_sectors, acknowledged);
8260 sectors -= this_sectors;
8261 s += this_sectors;
8262 }
8263 }
8264
8265 bb->changed = 1;
de393cde
N
8266 if (!acknowledged)
8267 bb->unacked_exist = 1;
905b0297 8268 write_sequnlock_irqrestore(&bb->lock, flags);
2230dfe4
N
8269
8270 return rv;
8271}
8272
3cb03002 8273int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
c6563a8c 8274 int is_new)
2230dfe4 8275{
c6563a8c
N
8276 int rv;
8277 if (is_new)
8278 s += rdev->new_data_offset;
8279 else
8280 s += rdev->data_offset;
8281 rv = md_set_badblocks(&rdev->badblocks,
8282 s, sectors, 0);
2230dfe4
N
8283 if (rv) {
8284 /* Make sure they get written out promptly */
8bd2f0a0 8285 sysfs_notify_dirent_safe(rdev->sysfs_state);
2230dfe4
N
8286 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
8287 md_wakeup_thread(rdev->mddev->thread);
8288 }
8289 return rv;
8290}
8291EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8292
8293/*
8294 * Remove a range of bad blocks from the table.
8295 * This may involve extending the table if we spilt a region,
8296 * but it must not fail. So if the table becomes full, we just
8297 * drop the remove request.
8298 */
8299static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
8300{
8301 u64 *p;
8302 int lo, hi;
8303 sector_t target = s + sectors;
8304 int rv = 0;
8305
8306 if (bb->shift > 0) {
8307 /* When clearing we round the start up and the end down.
8308 * This should not matter as the shift should align with
8309 * the block size and no rounding should ever be needed.
8310 * However it is better the think a block is bad when it
8311 * isn't than to think a block is not bad when it is.
8312 */
8313 s += (1<<bb->shift) - 1;
8314 s >>= bb->shift;
8315 target >>= bb->shift;
8316 sectors = target - s;
8317 }
8318
8319 write_seqlock_irq(&bb->lock);
8320
8321 p = bb->page;
8322 lo = 0;
8323 hi = bb->count;
8324 /* Find the last range that starts before 'target' */
8325 while (hi - lo > 1) {
8326 int mid = (lo + hi) / 2;
8327 sector_t a = BB_OFFSET(p[mid]);
8328 if (a < target)
8329 lo = mid;
8330 else
8331 hi = mid;
8332 }
8333 if (hi > lo) {
8334 /* p[lo] is the last range that could overlap the
8335 * current range. Earlier ranges could also overlap,
8336 * but only this one can overlap the end of the range.
8337 */
8338 if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
8339 /* Partial overlap, leave the tail of this range */
8340 int ack = BB_ACK(p[lo]);
8341 sector_t a = BB_OFFSET(p[lo]);
8342 sector_t end = a + BB_LEN(p[lo]);
8343
8344 if (a < s) {
8345 /* we need to split this range */
8346 if (bb->count >= MD_MAX_BADBLOCKS) {
8347 rv = 0;
8348 goto out;
8349 }
8350 memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
8351 bb->count++;
8352 p[lo] = BB_MAKE(a, s-a, ack);
8353 lo++;
8354 }
8355 p[lo] = BB_MAKE(target, end - target, ack);
8356 /* there is no longer an overlap */
8357 hi = lo;
8358 lo--;
8359 }
8360 while (lo >= 0 &&
8361 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8362 /* This range does overlap */
8363 if (BB_OFFSET(p[lo]) < s) {
8364 /* Keep the early parts of this range. */
8365 int ack = BB_ACK(p[lo]);
8366 sector_t start = BB_OFFSET(p[lo]);
8367 p[lo] = BB_MAKE(start, s - start, ack);
8368 /* now low doesn't overlap, so.. */
8369 break;
8370 }
8371 lo--;
8372 }
8373 /* 'lo' is strictly before, 'hi' is strictly after,
8374 * anything between needs to be discarded
8375 */
8376 if (hi - lo > 1) {
8377 memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
8378 bb->count -= (hi - lo - 1);
8379 }
8380 }
8381
8382 bb->changed = 1;
8383out:
8384 write_sequnlock_irq(&bb->lock);
8385 return rv;
8386}
8387
c6563a8c
N
8388int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8389 int is_new)
2230dfe4 8390{
c6563a8c
N
8391 if (is_new)
8392 s += rdev->new_data_offset;
8393 else
8394 s += rdev->data_offset;
2230dfe4 8395 return md_clear_badblocks(&rdev->badblocks,
c6563a8c 8396 s, sectors);
2230dfe4
N
8397}
8398EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8399
8400/*
8401 * Acknowledge all bad blocks in a list.
8402 * This only succeeds if ->changed is clear. It is used by
8403 * in-kernel metadata updates
8404 */
8405void md_ack_all_badblocks(struct badblocks *bb)
8406{
8407 if (bb->page == NULL || bb->changed)
8408 /* no point even trying */
8409 return;
8410 write_seqlock_irq(&bb->lock);
8411
ecb178bb 8412 if (bb->changed == 0 && bb->unacked_exist) {
2230dfe4
N
8413 u64 *p = bb->page;
8414 int i;
8415 for (i = 0; i < bb->count ; i++) {
8416 if (!BB_ACK(p[i])) {
8417 sector_t start = BB_OFFSET(p[i]);
8418 int len = BB_LEN(p[i]);
8419 p[i] = BB_MAKE(start, len, 1);
8420 }
8421 }
de393cde 8422 bb->unacked_exist = 0;
2230dfe4
N
8423 }
8424 write_sequnlock_irq(&bb->lock);
8425}
8426EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
8427
16c791a5
N
8428/* sysfs access to bad-blocks list.
8429 * We present two files.
8430 * 'bad-blocks' lists sector numbers and lengths of ranges that
8431 * are recorded as bad. The list is truncated to fit within
8432 * the one-page limit of sysfs.
8433 * Writing "sector length" to this file adds an acknowledged
8434 * bad block list.
8435 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8436 * been acknowledged. Writing to this file adds bad blocks
8437 * without acknowledging them. This is largely for testing.
8438 */
8439
8440static ssize_t
8441badblocks_show(struct badblocks *bb, char *page, int unack)
8442{
8443 size_t len;
8444 int i;
8445 u64 *p = bb->page;
8446 unsigned seq;
8447
8448 if (bb->shift < 0)
8449 return 0;
8450
8451retry:
8452 seq = read_seqbegin(&bb->lock);
8453
8454 len = 0;
8455 i = 0;
8456
8457 while (len < PAGE_SIZE && i < bb->count) {
8458 sector_t s = BB_OFFSET(p[i]);
8459 unsigned int length = BB_LEN(p[i]);
8460 int ack = BB_ACK(p[i]);
8461 i++;
8462
8463 if (unack && ack)
8464 continue;
8465
8466 len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n",
8467 (unsigned long long)s << bb->shift,
8468 length << bb->shift);
8469 }
de393cde
N
8470 if (unack && len == 0)
8471 bb->unacked_exist = 0;
16c791a5
N
8472
8473 if (read_seqretry(&bb->lock, seq))
8474 goto retry;
8475
8476 return len;
8477}
8478
8479#define DO_DEBUG 1
8480
8481static ssize_t
8482badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack)
8483{
8484 unsigned long long sector;
8485 int length;
8486 char newline;
8487#ifdef DO_DEBUG
8488 /* Allow clearing via sysfs *only* for testing/debugging.
8489 * Normally only a successful write may clear a badblock
8490 */
8491 int clear = 0;
8492 if (page[0] == '-') {
8493 clear = 1;
8494 page++;
8495 }
8496#endif /* DO_DEBUG */
8497
8498 switch (sscanf(page, "%llu %d%c", &sector, &length, &newline)) {
8499 case 3:
8500 if (newline != '\n')
8501 return -EINVAL;
8502 case 2:
8503 if (length <= 0)
8504 return -EINVAL;
8505 break;
8506 default:
8507 return -EINVAL;
8508 }
8509
8510#ifdef DO_DEBUG
8511 if (clear) {
8512 md_clear_badblocks(bb, sector, length);
8513 return len;
8514 }
8515#endif /* DO_DEBUG */
8516 if (md_set_badblocks(bb, sector, length, !unack))
8517 return len;
8518 else
8519 return -ENOSPC;
8520}
8521
75c96f85
AB
8522static int md_notify_reboot(struct notifier_block *this,
8523 unsigned long code, void *x)
1da177e4
LT
8524{
8525 struct list_head *tmp;
fd01b88c 8526 struct mddev *mddev;
2dba6a91 8527 int need_delay = 0;
1da177e4 8528
c744a65c
N
8529 for_each_mddev(mddev, tmp) {
8530 if (mddev_trylock(mddev)) {
30b8aa91
N
8531 if (mddev->pers)
8532 __md_stop_writes(mddev);
c744a65c
N
8533 mddev->safemode = 2;
8534 mddev_unlock(mddev);
2dba6a91 8535 }
c744a65c 8536 need_delay = 1;
1da177e4 8537 }
c744a65c
N
8538 /*
8539 * certain more exotic SCSI devices are known to be
8540 * volatile wrt too early system reboots. While the
8541 * right place to handle this issue is the given
8542 * driver, we do want to have a safe RAID driver ...
8543 */
8544 if (need_delay)
8545 mdelay(1000*1);
8546
1da177e4
LT
8547 return NOTIFY_DONE;
8548}
8549
75c96f85 8550static struct notifier_block md_notifier = {
1da177e4
LT
8551 .notifier_call = md_notify_reboot,
8552 .next = NULL,
8553 .priority = INT_MAX, /* before any real devices */
8554};
8555
8556static void md_geninit(void)
8557{
36a4e1fe 8558 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
1da177e4 8559
c7705f34 8560 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
1da177e4
LT
8561}
8562
75c96f85 8563static int __init md_init(void)
1da177e4 8564{
e804ac78
TH
8565 int ret = -ENOMEM;
8566
ada609ee 8567 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
e804ac78
TH
8568 if (!md_wq)
8569 goto err_wq;
8570
8571 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8572 if (!md_misc_wq)
8573 goto err_misc_wq;
8574
8575 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8576 goto err_md;
8577
8578 if ((ret = register_blkdev(0, "mdp")) < 0)
8579 goto err_mdp;
8580 mdp_major = ret;
8581
3dbd8c2e 8582 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
e8703fe1
N
8583 md_probe, NULL, NULL);
8584 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
1da177e4
LT
8585 md_probe, NULL, NULL);
8586
1da177e4 8587 register_reboot_notifier(&md_notifier);
0b4d4147 8588 raid_table_header = register_sysctl_table(raid_root_table);
1da177e4
LT
8589
8590 md_geninit();
d710e138 8591 return 0;
1da177e4 8592
e804ac78
TH
8593err_mdp:
8594 unregister_blkdev(MD_MAJOR, "md");
8595err_md:
8596 destroy_workqueue(md_misc_wq);
8597err_misc_wq:
8598 destroy_workqueue(md_wq);
8599err_wq:
8600 return ret;
8601}
1da177e4
LT
8602
8603#ifndef MODULE
8604
8605/*
8606 * Searches all registered partitions for autorun RAID arrays
8607 * at boot time.
8608 */
4d936ec1
ME
8609
8610static LIST_HEAD(all_detected_devices);
8611struct detected_devices_node {
8612 struct list_head list;
8613 dev_t dev;
8614};
1da177e4
LT
8615
8616void md_autodetect_dev(dev_t dev)
8617{
4d936ec1
ME
8618 struct detected_devices_node *node_detected_dev;
8619
8620 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
8621 if (node_detected_dev) {
8622 node_detected_dev->dev = dev;
8623 list_add_tail(&node_detected_dev->list, &all_detected_devices);
8624 } else {
8625 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
8626 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
8627 }
1da177e4
LT
8628}
8629
8630
8631static void autostart_arrays(int part)
8632{
3cb03002 8633 struct md_rdev *rdev;
4d936ec1
ME
8634 struct detected_devices_node *node_detected_dev;
8635 dev_t dev;
8636 int i_scanned, i_passed;
1da177e4 8637
4d936ec1
ME
8638 i_scanned = 0;
8639 i_passed = 0;
1da177e4 8640
4d936ec1 8641 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
1da177e4 8642
4d936ec1
ME
8643 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
8644 i_scanned++;
8645 node_detected_dev = list_entry(all_detected_devices.next,
8646 struct detected_devices_node, list);
8647 list_del(&node_detected_dev->list);
8648 dev = node_detected_dev->dev;
8649 kfree(node_detected_dev);
df968c4e 8650 rdev = md_import_device(dev,0, 90);
1da177e4
LT
8651 if (IS_ERR(rdev))
8652 continue;
8653
b2d444d7 8654 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT
8655 MD_BUG();
8656 continue;
8657 }
d0fae18f 8658 set_bit(AutoDetected, &rdev->flags);
1da177e4 8659 list_add(&rdev->same_set, &pending_raid_disks);
4d936ec1 8660 i_passed++;
1da177e4 8661 }
4d936ec1
ME
8662
8663 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
8664 i_scanned, i_passed);
1da177e4
LT
8665
8666 autorun_devices(part);
8667}
8668
fdee8ae4 8669#endif /* !MODULE */
1da177e4
LT
8670
8671static __exit void md_exit(void)
8672{
fd01b88c 8673 struct mddev *mddev;
1da177e4 8674 struct list_head *tmp;
8ab5e4c1 8675
3dbd8c2e 8676 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
e8703fe1 8677 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
1da177e4 8678
3dbd8c2e 8679 unregister_blkdev(MD_MAJOR,"md");
1da177e4
LT
8680 unregister_blkdev(mdp_major, "mdp");
8681 unregister_reboot_notifier(&md_notifier);
8682 unregister_sysctl_table(raid_table_header);
8683 remove_proc_entry("mdstat", NULL);
29ac4aa3 8684 for_each_mddev(mddev, tmp) {
1da177e4 8685 export_array(mddev);
d3374825 8686 mddev->hold_active = 0;
1da177e4 8687 }
e804ac78
TH
8688 destroy_workqueue(md_misc_wq);
8689 destroy_workqueue(md_wq);
1da177e4
LT
8690}
8691
685784aa 8692subsys_initcall(md_init);
1da177e4
LT
8693module_exit(md_exit)
8694
f91de92e
N
8695static int get_ro(char *buffer, struct kernel_param *kp)
8696{
8697 return sprintf(buffer, "%d", start_readonly);
8698}
8699static int set_ro(const char *val, struct kernel_param *kp)
8700{
8701 char *e;
8702 int num = simple_strtoul(val, &e, 10);
8703 if (*val && (*e == '\0' || *e == '\n')) {
8704 start_readonly = num;
4dbcdc75 8705 return 0;
f91de92e
N
8706 }
8707 return -EINVAL;
8708}
8709
80ca3a44
N
8710module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
8711module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6ff8d8ec 8712
efeb53c0 8713module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
f91de92e 8714
1da177e4
LT
8715EXPORT_SYMBOL(register_md_personality);
8716EXPORT_SYMBOL(unregister_md_personality);
8717EXPORT_SYMBOL(md_error);
8718EXPORT_SYMBOL(md_done_sync);
8719EXPORT_SYMBOL(md_write_start);
8720EXPORT_SYMBOL(md_write_end);
1da177e4
LT
8721EXPORT_SYMBOL(md_register_thread);
8722EXPORT_SYMBOL(md_unregister_thread);
8723EXPORT_SYMBOL(md_wakeup_thread);
1da177e4 8724EXPORT_SYMBOL(md_check_recovery);
a91d5ac0 8725EXPORT_SYMBOL(md_reap_sync_thread);
1da177e4 8726MODULE_LICENSE("GPL");
0efb9e61 8727MODULE_DESCRIPTION("MD RAID framework");
aa1595e9 8728MODULE_ALIAS("md");
72008652 8729MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);