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1da177e4
LT
1/*
2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
4
5 completely rewritten, based on the MD driver code from Marc Zyngier
6
7 Changes:
8
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
16
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
19
20 Neil Brown <neilb@cse.unsw.edu.au>.
21
32a7627c
N
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
24
1da177e4
LT
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
28 any later version.
29
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
33*/
34
a6fb0934 35#include <linux/kthread.h>
bff61975 36#include <linux/blkdev.h>
1da177e4 37#include <linux/sysctl.h>
bff61975 38#include <linux/seq_file.h>
2a48fc0a 39#include <linux/mutex.h>
1da177e4 40#include <linux/buffer_head.h> /* for invalidate_bdev */
d7603b7e 41#include <linux/poll.h>
16f17b39 42#include <linux/ctype.h>
e7d2860b 43#include <linux/string.h>
fb4d8c76
N
44#include <linux/hdreg.h>
45#include <linux/proc_fs.h>
46#include <linux/random.h>
47#include <linux/reboot.h>
32a7627c 48#include <linux/file.h>
aa98aa31 49#include <linux/compat.h>
25570727 50#include <linux/delay.h>
bff61975
N
51#include <linux/raid/md_p.h>
52#include <linux/raid/md_u.h>
5a0e3ad6 53#include <linux/slab.h>
43b2e5d8 54#include "md.h"
ef740c37 55#include "bitmap.h"
1da177e4
LT
56
57#define DEBUG 0
58#define dprintk(x...) ((void)(DEBUG && printk(x)))
59
1da177e4 60#ifndef MODULE
d710e138 61static void autostart_arrays(int part);
1da177e4
LT
62#endif
63
2604b703 64static LIST_HEAD(pers_list);
1da177e4
LT
65static DEFINE_SPINLOCK(pers_lock);
66
5e56341d
AB
67static void md_print_devices(void);
68
90b08710 69static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
e804ac78
TH
70static struct workqueue_struct *md_wq;
71static struct workqueue_struct *md_misc_wq;
90b08710 72
5e56341d
AB
73#define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
74
1e50915f
RB
75/*
76 * Default number of read corrections we'll attempt on an rdev
77 * before ejecting it from the array. We divide the read error
78 * count by 2 for every hour elapsed between read errors.
79 */
80#define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
1da177e4
LT
81/*
82 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
83 * is 1000 KB/sec, so the extra system load does not show up that much.
84 * Increase it if you want to have more _guaranteed_ speed. Note that
338cec32 85 * the RAID driver will use the maximum available bandwidth if the IO
1da177e4
LT
86 * subsystem is idle. There is also an 'absolute maximum' reconstruction
87 * speed limit - in case reconstruction slows down your system despite
88 * idle IO detection.
89 *
90 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
88202a0c 91 * or /sys/block/mdX/md/sync_speed_{min,max}
1da177e4
LT
92 */
93
94static int sysctl_speed_limit_min = 1000;
95static int sysctl_speed_limit_max = 200000;
88202a0c
N
96static inline int speed_min(mddev_t *mddev)
97{
98 return mddev->sync_speed_min ?
99 mddev->sync_speed_min : sysctl_speed_limit_min;
100}
101
102static inline int speed_max(mddev_t *mddev)
103{
104 return mddev->sync_speed_max ?
105 mddev->sync_speed_max : sysctl_speed_limit_max;
106}
1da177e4
LT
107
108static struct ctl_table_header *raid_table_header;
109
110static ctl_table raid_table[] = {
111 {
1da177e4
LT
112 .procname = "speed_limit_min",
113 .data = &sysctl_speed_limit_min,
114 .maxlen = sizeof(int),
80ca3a44 115 .mode = S_IRUGO|S_IWUSR,
6d456111 116 .proc_handler = proc_dointvec,
1da177e4
LT
117 },
118 {
1da177e4
LT
119 .procname = "speed_limit_max",
120 .data = &sysctl_speed_limit_max,
121 .maxlen = sizeof(int),
80ca3a44 122 .mode = S_IRUGO|S_IWUSR,
6d456111 123 .proc_handler = proc_dointvec,
1da177e4 124 },
894d2491 125 { }
1da177e4
LT
126};
127
128static ctl_table raid_dir_table[] = {
129 {
1da177e4
LT
130 .procname = "raid",
131 .maxlen = 0,
80ca3a44 132 .mode = S_IRUGO|S_IXUGO,
1da177e4
LT
133 .child = raid_table,
134 },
894d2491 135 { }
1da177e4
LT
136};
137
138static ctl_table raid_root_table[] = {
139 {
1da177e4
LT
140 .procname = "dev",
141 .maxlen = 0,
142 .mode = 0555,
143 .child = raid_dir_table,
144 },
894d2491 145 { }
1da177e4
LT
146};
147
83d5cde4 148static const struct block_device_operations md_fops;
1da177e4 149
f91de92e
N
150static int start_readonly;
151
a167f663
N
152/* bio_clone_mddev
153 * like bio_clone, but with a local bio set
154 */
155
156static void mddev_bio_destructor(struct bio *bio)
157{
158 mddev_t *mddev, **mddevp;
159
160 mddevp = (void*)bio;
161 mddev = mddevp[-1];
162
163 bio_free(bio, mddev->bio_set);
164}
165
166struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
167 mddev_t *mddev)
168{
169 struct bio *b;
170 mddev_t **mddevp;
171
172 if (!mddev || !mddev->bio_set)
173 return bio_alloc(gfp_mask, nr_iovecs);
174
175 b = bio_alloc_bioset(gfp_mask, nr_iovecs,
176 mddev->bio_set);
177 if (!b)
178 return NULL;
179 mddevp = (void*)b;
180 mddevp[-1] = mddev;
181 b->bi_destructor = mddev_bio_destructor;
182 return b;
183}
184EXPORT_SYMBOL_GPL(bio_alloc_mddev);
185
186struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
187 mddev_t *mddev)
188{
189 struct bio *b;
190 mddev_t **mddevp;
191
192 if (!mddev || !mddev->bio_set)
193 return bio_clone(bio, gfp_mask);
194
195 b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs,
196 mddev->bio_set);
197 if (!b)
198 return NULL;
199 mddevp = (void*)b;
200 mddevp[-1] = mddev;
201 b->bi_destructor = mddev_bio_destructor;
202 __bio_clone(b, bio);
203 if (bio_integrity(bio)) {
204 int ret;
205
206 ret = bio_integrity_clone(b, bio, gfp_mask, mddev->bio_set);
207
208 if (ret < 0) {
209 bio_put(b);
210 return NULL;
211 }
212 }
213
214 return b;
215}
216EXPORT_SYMBOL_GPL(bio_clone_mddev);
217
d7603b7e
N
218/*
219 * We have a system wide 'event count' that is incremented
220 * on any 'interesting' event, and readers of /proc/mdstat
221 * can use 'poll' or 'select' to find out when the event
222 * count increases.
223 *
224 * Events are:
225 * start array, stop array, error, add device, remove device,
226 * start build, activate spare
227 */
2989ddbd 228static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
d7603b7e 229static atomic_t md_event_count;
29269553 230void md_new_event(mddev_t *mddev)
d7603b7e
N
231{
232 atomic_inc(&md_event_count);
233 wake_up(&md_event_waiters);
234}
29269553 235EXPORT_SYMBOL_GPL(md_new_event);
d7603b7e 236
c331eb04
N
237/* Alternate version that can be called from interrupts
238 * when calling sysfs_notify isn't needed.
239 */
05381954 240static void md_new_event_inintr(mddev_t *mddev)
c331eb04
N
241{
242 atomic_inc(&md_event_count);
243 wake_up(&md_event_waiters);
244}
245
1da177e4
LT
246/*
247 * Enables to iterate over all existing md arrays
248 * all_mddevs_lock protects this list.
249 */
250static LIST_HEAD(all_mddevs);
251static DEFINE_SPINLOCK(all_mddevs_lock);
252
253
254/*
255 * iterates through all used mddevs in the system.
256 * We take care to grab the all_mddevs_lock whenever navigating
257 * the list, and to always hold a refcount when unlocked.
258 * Any code which breaks out of this loop while own
259 * a reference to the current mddev and must mddev_put it.
260 */
29ac4aa3 261#define for_each_mddev(mddev,tmp) \
1da177e4
LT
262 \
263 for (({ spin_lock(&all_mddevs_lock); \
264 tmp = all_mddevs.next; \
265 mddev = NULL;}); \
266 ({ if (tmp != &all_mddevs) \
267 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
268 spin_unlock(&all_mddevs_lock); \
269 if (mddev) mddev_put(mddev); \
270 mddev = list_entry(tmp, mddev_t, all_mddevs); \
271 tmp != &all_mddevs;}); \
272 ({ spin_lock(&all_mddevs_lock); \
273 tmp = tmp->next;}) \
274 )
275
276
409c57f3
N
277/* Rather than calling directly into the personality make_request function,
278 * IO requests come here first so that we can check if the device is
279 * being suspended pending a reconfiguration.
280 * We hold a refcount over the call to ->make_request. By the time that
281 * call has finished, the bio has been linked into some internal structure
282 * and so is visible to ->quiesce(), so we don't need the refcount any more.
283 */
284static int md_make_request(struct request_queue *q, struct bio *bio)
1da177e4 285{
49077326 286 const int rw = bio_data_dir(bio);
409c57f3
N
287 mddev_t *mddev = q->queuedata;
288 int rv;
49077326
N
289 int cpu;
290
0ca69886
N
291 if (mddev == NULL || mddev->pers == NULL
292 || !mddev->ready) {
409c57f3
N
293 bio_io_error(bio);
294 return 0;
295 }
0ca69886 296 smp_rmb(); /* Ensure implications of 'active' are visible */
409c57f3 297 rcu_read_lock();
e9c7469b 298 if (mddev->suspended) {
409c57f3
N
299 DEFINE_WAIT(__wait);
300 for (;;) {
301 prepare_to_wait(&mddev->sb_wait, &__wait,
302 TASK_UNINTERRUPTIBLE);
e9c7469b 303 if (!mddev->suspended)
409c57f3
N
304 break;
305 rcu_read_unlock();
306 schedule();
307 rcu_read_lock();
308 }
309 finish_wait(&mddev->sb_wait, &__wait);
310 }
311 atomic_inc(&mddev->active_io);
312 rcu_read_unlock();
49077326 313
21a52c6d 314 rv = mddev->pers->make_request(mddev, bio);
49077326
N
315
316 cpu = part_stat_lock();
317 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
318 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
319 bio_sectors(bio));
320 part_stat_unlock();
321
409c57f3
N
322 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
323 wake_up(&mddev->sb_wait);
324
325 return rv;
326}
327
9e35b99c
N
328/* mddev_suspend makes sure no new requests are submitted
329 * to the device, and that any requests that have been submitted
330 * are completely handled.
331 * Once ->stop is called and completes, the module will be completely
332 * unused.
333 */
390ee602 334void mddev_suspend(mddev_t *mddev)
409c57f3
N
335{
336 BUG_ON(mddev->suspended);
337 mddev->suspended = 1;
338 synchronize_rcu();
339 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
340 mddev->pers->quiesce(mddev, 1);
409c57f3 341}
390ee602 342EXPORT_SYMBOL_GPL(mddev_suspend);
409c57f3 343
390ee602 344void mddev_resume(mddev_t *mddev)
409c57f3
N
345{
346 mddev->suspended = 0;
347 wake_up(&mddev->sb_wait);
348 mddev->pers->quiesce(mddev, 0);
1da177e4 349}
390ee602 350EXPORT_SYMBOL_GPL(mddev_resume);
1da177e4 351
3fa841d7
N
352int mddev_congested(mddev_t *mddev, int bits)
353{
354 return mddev->suspended;
355}
356EXPORT_SYMBOL(mddev_congested);
357
a2826aa9 358/*
e9c7469b 359 * Generic flush handling for md
a2826aa9
N
360 */
361
e9c7469b 362static void md_end_flush(struct bio *bio, int err)
a2826aa9
N
363{
364 mdk_rdev_t *rdev = bio->bi_private;
365 mddev_t *mddev = rdev->mddev;
a2826aa9
N
366
367 rdev_dec_pending(rdev, mddev);
368
369 if (atomic_dec_and_test(&mddev->flush_pending)) {
e9c7469b 370 /* The pre-request flush has finished */
e804ac78 371 queue_work(md_wq, &mddev->flush_work);
a2826aa9
N
372 }
373 bio_put(bio);
374}
375
a7a07e69
N
376static void md_submit_flush_data(struct work_struct *ws);
377
a035fc3e 378static void submit_flushes(struct work_struct *ws)
a2826aa9 379{
a035fc3e 380 mddev_t *mddev = container_of(ws, mddev_t, flush_work);
a2826aa9
N
381 mdk_rdev_t *rdev;
382
a7a07e69
N
383 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
384 atomic_set(&mddev->flush_pending, 1);
a2826aa9
N
385 rcu_read_lock();
386 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
387 if (rdev->raid_disk >= 0 &&
388 !test_bit(Faulty, &rdev->flags)) {
389 /* Take two references, one is dropped
390 * when request finishes, one after
391 * we reclaim rcu_read_lock
392 */
393 struct bio *bi;
394 atomic_inc(&rdev->nr_pending);
395 atomic_inc(&rdev->nr_pending);
396 rcu_read_unlock();
a167f663 397 bi = bio_alloc_mddev(GFP_KERNEL, 0, mddev);
e9c7469b 398 bi->bi_end_io = md_end_flush;
a2826aa9
N
399 bi->bi_private = rdev;
400 bi->bi_bdev = rdev->bdev;
401 atomic_inc(&mddev->flush_pending);
e9c7469b 402 submit_bio(WRITE_FLUSH, bi);
a2826aa9
N
403 rcu_read_lock();
404 rdev_dec_pending(rdev, mddev);
405 }
406 rcu_read_unlock();
a7a07e69
N
407 if (atomic_dec_and_test(&mddev->flush_pending))
408 queue_work(md_wq, &mddev->flush_work);
a2826aa9
N
409}
410
e9c7469b 411static void md_submit_flush_data(struct work_struct *ws)
a2826aa9 412{
e9c7469b
TH
413 mddev_t *mddev = container_of(ws, mddev_t, flush_work);
414 struct bio *bio = mddev->flush_bio;
a2826aa9 415
e9c7469b 416 if (bio->bi_size == 0)
a2826aa9
N
417 /* an empty barrier - all done */
418 bio_endio(bio, 0);
419 else {
e9c7469b 420 bio->bi_rw &= ~REQ_FLUSH;
21a52c6d 421 if (mddev->pers->make_request(mddev, bio))
a2826aa9 422 generic_make_request(bio);
a2826aa9 423 }
2b74e12e
N
424
425 mddev->flush_bio = NULL;
426 wake_up(&mddev->sb_wait);
a2826aa9
N
427}
428
e9c7469b 429void md_flush_request(mddev_t *mddev, struct bio *bio)
a2826aa9
N
430{
431 spin_lock_irq(&mddev->write_lock);
432 wait_event_lock_irq(mddev->sb_wait,
e9c7469b 433 !mddev->flush_bio,
a2826aa9 434 mddev->write_lock, /*nothing*/);
e9c7469b 435 mddev->flush_bio = bio;
a2826aa9
N
436 spin_unlock_irq(&mddev->write_lock);
437
a035fc3e
N
438 INIT_WORK(&mddev->flush_work, submit_flushes);
439 queue_work(md_wq, &mddev->flush_work);
a2826aa9 440}
e9c7469b 441EXPORT_SYMBOL(md_flush_request);
409c57f3 442
2ac87401
N
443/* Support for plugging.
444 * This mirrors the plugging support in request_queue, but does not
445 * require having a whole queue
446 */
447static void plugger_work(struct work_struct *work)
448{
449 struct plug_handle *plug =
450 container_of(work, struct plug_handle, unplug_work);
451 plug->unplug_fn(plug);
452}
453static void plugger_timeout(unsigned long data)
454{
455 struct plug_handle *plug = (void *)data;
456 kblockd_schedule_work(NULL, &plug->unplug_work);
457}
458void plugger_init(struct plug_handle *plug,
459 void (*unplug_fn)(struct plug_handle *))
460{
461 plug->unplug_flag = 0;
462 plug->unplug_fn = unplug_fn;
463 init_timer(&plug->unplug_timer);
464 plug->unplug_timer.function = plugger_timeout;
465 plug->unplug_timer.data = (unsigned long)plug;
466 INIT_WORK(&plug->unplug_work, plugger_work);
467}
468EXPORT_SYMBOL_GPL(plugger_init);
469
470void plugger_set_plug(struct plug_handle *plug)
471{
472 if (!test_and_set_bit(PLUGGED_FLAG, &plug->unplug_flag))
473 mod_timer(&plug->unplug_timer, jiffies + msecs_to_jiffies(3)+1);
474}
475EXPORT_SYMBOL_GPL(plugger_set_plug);
476
477int plugger_remove_plug(struct plug_handle *plug)
478{
479 if (test_and_clear_bit(PLUGGED_FLAG, &plug->unplug_flag)) {
480 del_timer(&plug->unplug_timer);
481 return 1;
482 } else
483 return 0;
484}
485EXPORT_SYMBOL_GPL(plugger_remove_plug);
486
487
1da177e4
LT
488static inline mddev_t *mddev_get(mddev_t *mddev)
489{
490 atomic_inc(&mddev->active);
491 return mddev;
492}
493
5fd3a17e 494static void mddev_delayed_delete(struct work_struct *ws);
d3374825 495
1da177e4
LT
496static void mddev_put(mddev_t *mddev)
497{
a167f663
N
498 struct bio_set *bs = NULL;
499
1da177e4
LT
500 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
501 return;
d3374825 502 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
cbd19983
N
503 mddev->ctime == 0 && !mddev->hold_active) {
504 /* Array is not configured at all, and not held active,
505 * so destroy it */
1da177e4 506 list_del(&mddev->all_mddevs);
a167f663
N
507 bs = mddev->bio_set;
508 mddev->bio_set = NULL;
d3374825 509 if (mddev->gendisk) {
e804ac78
TH
510 /* We did a probe so need to clean up. Call
511 * queue_work inside the spinlock so that
512 * flush_workqueue() after mddev_find will
513 * succeed in waiting for the work to be done.
d3374825
N
514 */
515 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
e804ac78 516 queue_work(md_misc_wq, &mddev->del_work);
d3374825
N
517 } else
518 kfree(mddev);
519 }
520 spin_unlock(&all_mddevs_lock);
a167f663
N
521 if (bs)
522 bioset_free(bs);
1da177e4
LT
523}
524
390ee602 525void mddev_init(mddev_t *mddev)
fafd7fb0
N
526{
527 mutex_init(&mddev->open_mutex);
528 mutex_init(&mddev->reconfig_mutex);
529 mutex_init(&mddev->bitmap_info.mutex);
530 INIT_LIST_HEAD(&mddev->disks);
531 INIT_LIST_HEAD(&mddev->all_mddevs);
532 init_timer(&mddev->safemode_timer);
533 atomic_set(&mddev->active, 1);
534 atomic_set(&mddev->openers, 0);
535 atomic_set(&mddev->active_io, 0);
536 spin_lock_init(&mddev->write_lock);
537 atomic_set(&mddev->flush_pending, 0);
538 init_waitqueue_head(&mddev->sb_wait);
539 init_waitqueue_head(&mddev->recovery_wait);
540 mddev->reshape_position = MaxSector;
541 mddev->resync_min = 0;
542 mddev->resync_max = MaxSector;
543 mddev->level = LEVEL_NONE;
544}
390ee602 545EXPORT_SYMBOL_GPL(mddev_init);
fafd7fb0 546
1da177e4
LT
547static mddev_t * mddev_find(dev_t unit)
548{
549 mddev_t *mddev, *new = NULL;
550
551 retry:
552 spin_lock(&all_mddevs_lock);
efeb53c0
N
553
554 if (unit) {
555 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
556 if (mddev->unit == unit) {
557 mddev_get(mddev);
558 spin_unlock(&all_mddevs_lock);
559 kfree(new);
560 return mddev;
561 }
562
563 if (new) {
564 list_add(&new->all_mddevs, &all_mddevs);
1da177e4 565 spin_unlock(&all_mddevs_lock);
efeb53c0
N
566 new->hold_active = UNTIL_IOCTL;
567 return new;
1da177e4 568 }
efeb53c0
N
569 } else if (new) {
570 /* find an unused unit number */
571 static int next_minor = 512;
572 int start = next_minor;
573 int is_free = 0;
574 int dev = 0;
575 while (!is_free) {
576 dev = MKDEV(MD_MAJOR, next_minor);
577 next_minor++;
578 if (next_minor > MINORMASK)
579 next_minor = 0;
580 if (next_minor == start) {
581 /* Oh dear, all in use. */
582 spin_unlock(&all_mddevs_lock);
583 kfree(new);
584 return NULL;
585 }
586
587 is_free = 1;
588 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
589 if (mddev->unit == dev) {
590 is_free = 0;
591 break;
592 }
593 }
594 new->unit = dev;
595 new->md_minor = MINOR(dev);
596 new->hold_active = UNTIL_STOP;
1da177e4
LT
597 list_add(&new->all_mddevs, &all_mddevs);
598 spin_unlock(&all_mddevs_lock);
599 return new;
600 }
601 spin_unlock(&all_mddevs_lock);
602
9ffae0cf 603 new = kzalloc(sizeof(*new), GFP_KERNEL);
1da177e4
LT
604 if (!new)
605 return NULL;
606
1da177e4
LT
607 new->unit = unit;
608 if (MAJOR(unit) == MD_MAJOR)
609 new->md_minor = MINOR(unit);
610 else
611 new->md_minor = MINOR(unit) >> MdpMinorShift;
612
fafd7fb0 613 mddev_init(new);
1da177e4 614
1da177e4
LT
615 goto retry;
616}
617
618static inline int mddev_lock(mddev_t * mddev)
619{
df5b89b3 620 return mutex_lock_interruptible(&mddev->reconfig_mutex);
1da177e4
LT
621}
622
b522adcd
DW
623static inline int mddev_is_locked(mddev_t *mddev)
624{
625 return mutex_is_locked(&mddev->reconfig_mutex);
626}
627
1da177e4
LT
628static inline int mddev_trylock(mddev_t * mddev)
629{
df5b89b3 630 return mutex_trylock(&mddev->reconfig_mutex);
1da177e4
LT
631}
632
b6eb127d
N
633static struct attribute_group md_redundancy_group;
634
a64c876f 635static void mddev_unlock(mddev_t * mddev)
1da177e4 636{
a64c876f 637 if (mddev->to_remove) {
b6eb127d
N
638 /* These cannot be removed under reconfig_mutex as
639 * an access to the files will try to take reconfig_mutex
640 * while holding the file unremovable, which leads to
641 * a deadlock.
bb4f1e9d
N
642 * So hold set sysfs_active while the remove in happeing,
643 * and anything else which might set ->to_remove or my
644 * otherwise change the sysfs namespace will fail with
645 * -EBUSY if sysfs_active is still set.
646 * We set sysfs_active under reconfig_mutex and elsewhere
647 * test it under the same mutex to ensure its correct value
648 * is seen.
b6eb127d 649 */
a64c876f
N
650 struct attribute_group *to_remove = mddev->to_remove;
651 mddev->to_remove = NULL;
bb4f1e9d 652 mddev->sysfs_active = 1;
b6eb127d
N
653 mutex_unlock(&mddev->reconfig_mutex);
654
00bcb4ac
N
655 if (mddev->kobj.sd) {
656 if (to_remove != &md_redundancy_group)
657 sysfs_remove_group(&mddev->kobj, to_remove);
658 if (mddev->pers == NULL ||
659 mddev->pers->sync_request == NULL) {
660 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
661 if (mddev->sysfs_action)
662 sysfs_put(mddev->sysfs_action);
663 mddev->sysfs_action = NULL;
664 }
a64c876f 665 }
bb4f1e9d 666 mddev->sysfs_active = 0;
b6eb127d
N
667 } else
668 mutex_unlock(&mddev->reconfig_mutex);
1da177e4 669
005eca5e 670 md_wakeup_thread(mddev->thread);
1da177e4
LT
671}
672
2989ddbd 673static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
1da177e4 674{
159ec1fc 675 mdk_rdev_t *rdev;
1da177e4 676
159ec1fc 677 list_for_each_entry(rdev, &mddev->disks, same_set)
1da177e4
LT
678 if (rdev->desc_nr == nr)
679 return rdev;
159ec1fc 680
1da177e4
LT
681 return NULL;
682}
683
684static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
685{
1da177e4
LT
686 mdk_rdev_t *rdev;
687
159ec1fc 688 list_for_each_entry(rdev, &mddev->disks, same_set)
1da177e4
LT
689 if (rdev->bdev->bd_dev == dev)
690 return rdev;
159ec1fc 691
1da177e4
LT
692 return NULL;
693}
694
d9d166c2 695static struct mdk_personality *find_pers(int level, char *clevel)
2604b703
N
696{
697 struct mdk_personality *pers;
d9d166c2
N
698 list_for_each_entry(pers, &pers_list, list) {
699 if (level != LEVEL_NONE && pers->level == level)
2604b703 700 return pers;
d9d166c2
N
701 if (strcmp(pers->name, clevel)==0)
702 return pers;
703 }
2604b703
N
704 return NULL;
705}
706
b73df2d3 707/* return the offset of the super block in 512byte sectors */
57b2caa3 708static inline sector_t calc_dev_sboffset(mdk_rdev_t *rdev)
1da177e4 709{
57b2caa3 710 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
b73df2d3 711 return MD_NEW_SIZE_SECTORS(num_sectors);
1da177e4
LT
712}
713
1da177e4
LT
714static int alloc_disk_sb(mdk_rdev_t * rdev)
715{
716 if (rdev->sb_page)
717 MD_BUG();
718
719 rdev->sb_page = alloc_page(GFP_KERNEL);
720 if (!rdev->sb_page) {
721 printk(KERN_ALERT "md: out of memory.\n");
ebc24337 722 return -ENOMEM;
1da177e4
LT
723 }
724
725 return 0;
726}
727
728static void free_disk_sb(mdk_rdev_t * rdev)
729{
730 if (rdev->sb_page) {
2d1f3b5d 731 put_page(rdev->sb_page);
1da177e4
LT
732 rdev->sb_loaded = 0;
733 rdev->sb_page = NULL;
0f420358 734 rdev->sb_start = 0;
dd8ac336 735 rdev->sectors = 0;
1da177e4
LT
736 }
737}
738
739
6712ecf8 740static void super_written(struct bio *bio, int error)
7bfa19f2
N
741{
742 mdk_rdev_t *rdev = bio->bi_private;
a9701a30 743 mddev_t *mddev = rdev->mddev;
7bfa19f2 744
3a0f5bbb
N
745 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
746 printk("md: super_written gets error=%d, uptodate=%d\n",
747 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
748 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
a9701a30 749 md_error(mddev, rdev);
3a0f5bbb 750 }
7bfa19f2 751
a9701a30
N
752 if (atomic_dec_and_test(&mddev->pending_writes))
753 wake_up(&mddev->sb_wait);
f8b58edf 754 bio_put(bio);
7bfa19f2
N
755}
756
757void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
758 sector_t sector, int size, struct page *page)
759{
760 /* write first size bytes of page to sector of rdev
761 * Increment mddev->pending_writes before returning
762 * and decrement it on completion, waking up sb_wait
763 * if zero is reached.
764 * If an error occurred, call md_error
765 */
a167f663 766 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
7bfa19f2
N
767
768 bio->bi_bdev = rdev->bdev;
769 bio->bi_sector = sector;
770 bio_add_page(bio, page, size, 0);
771 bio->bi_private = rdev;
772 bio->bi_end_io = super_written;
a9701a30 773
7bfa19f2 774 atomic_inc(&mddev->pending_writes);
e9c7469b
TH
775 submit_bio(REQ_WRITE | REQ_SYNC | REQ_UNPLUG | REQ_FLUSH | REQ_FUA,
776 bio);
a9701a30
N
777}
778
779void md_super_wait(mddev_t *mddev)
780{
e9c7469b 781 /* wait for all superblock writes that were scheduled to complete */
a9701a30
N
782 DEFINE_WAIT(wq);
783 for(;;) {
784 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
785 if (atomic_read(&mddev->pending_writes)==0)
786 break;
a9701a30
N
787 schedule();
788 }
789 finish_wait(&mddev->sb_wait, &wq);
7bfa19f2
N
790}
791
6712ecf8 792static void bi_complete(struct bio *bio, int error)
1da177e4 793{
1da177e4 794 complete((struct completion*)bio->bi_private);
1da177e4
LT
795}
796
2b193363 797int sync_page_io(mdk_rdev_t *rdev, sector_t sector, int size,
ccebd4c4 798 struct page *page, int rw, bool metadata_op)
1da177e4 799{
a167f663 800 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
1da177e4
LT
801 struct completion event;
802 int ret;
803
7b6d91da 804 rw |= REQ_SYNC | REQ_UNPLUG;
1da177e4 805
2b193363 806 bio->bi_bdev = rdev->bdev;
ccebd4c4
JB
807 if (metadata_op)
808 bio->bi_sector = sector + rdev->sb_start;
809 else
810 bio->bi_sector = sector + rdev->data_offset;
1da177e4
LT
811 bio_add_page(bio, page, size, 0);
812 init_completion(&event);
813 bio->bi_private = &event;
814 bio->bi_end_io = bi_complete;
815 submit_bio(rw, bio);
816 wait_for_completion(&event);
817
818 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
819 bio_put(bio);
820 return ret;
821}
a8745db2 822EXPORT_SYMBOL_GPL(sync_page_io);
1da177e4 823
0002b271 824static int read_disk_sb(mdk_rdev_t * rdev, int size)
1da177e4
LT
825{
826 char b[BDEVNAME_SIZE];
827 if (!rdev->sb_page) {
828 MD_BUG();
829 return -EINVAL;
830 }
831 if (rdev->sb_loaded)
832 return 0;
833
834
ccebd4c4 835 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
1da177e4
LT
836 goto fail;
837 rdev->sb_loaded = 1;
838 return 0;
839
840fail:
841 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
842 bdevname(rdev->bdev,b));
843 return -EINVAL;
844}
845
846static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
847{
05710466
AN
848 return sb1->set_uuid0 == sb2->set_uuid0 &&
849 sb1->set_uuid1 == sb2->set_uuid1 &&
850 sb1->set_uuid2 == sb2->set_uuid2 &&
851 sb1->set_uuid3 == sb2->set_uuid3;
1da177e4
LT
852}
853
1da177e4
LT
854static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
855{
856 int ret;
857 mdp_super_t *tmp1, *tmp2;
858
859 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
860 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
861
862 if (!tmp1 || !tmp2) {
863 ret = 0;
35020f1a 864 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
1da177e4
LT
865 goto abort;
866 }
867
868 *tmp1 = *sb1;
869 *tmp2 = *sb2;
870
871 /*
872 * nr_disks is not constant
873 */
874 tmp1->nr_disks = 0;
875 tmp2->nr_disks = 0;
876
ce0c8e05 877 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
1da177e4 878abort:
990a8baf
JJ
879 kfree(tmp1);
880 kfree(tmp2);
1da177e4
LT
881 return ret;
882}
883
4d167f09
N
884
885static u32 md_csum_fold(u32 csum)
886{
887 csum = (csum & 0xffff) + (csum >> 16);
888 return (csum & 0xffff) + (csum >> 16);
889}
890
1da177e4
LT
891static unsigned int calc_sb_csum(mdp_super_t * sb)
892{
4d167f09
N
893 u64 newcsum = 0;
894 u32 *sb32 = (u32*)sb;
895 int i;
1da177e4
LT
896 unsigned int disk_csum, csum;
897
898 disk_csum = sb->sb_csum;
899 sb->sb_csum = 0;
4d167f09
N
900
901 for (i = 0; i < MD_SB_BYTES/4 ; i++)
902 newcsum += sb32[i];
903 csum = (newcsum & 0xffffffff) + (newcsum>>32);
904
905
906#ifdef CONFIG_ALPHA
907 /* This used to use csum_partial, which was wrong for several
908 * reasons including that different results are returned on
909 * different architectures. It isn't critical that we get exactly
910 * the same return value as before (we always csum_fold before
911 * testing, and that removes any differences). However as we
912 * know that csum_partial always returned a 16bit value on
913 * alphas, do a fold to maximise conformity to previous behaviour.
914 */
915 sb->sb_csum = md_csum_fold(disk_csum);
916#else
1da177e4 917 sb->sb_csum = disk_csum;
4d167f09 918#endif
1da177e4
LT
919 return csum;
920}
921
922
923/*
924 * Handle superblock details.
925 * We want to be able to handle multiple superblock formats
926 * so we have a common interface to them all, and an array of
927 * different handlers.
928 * We rely on user-space to write the initial superblock, and support
929 * reading and updating of superblocks.
930 * Interface methods are:
931 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
932 * loads and validates a superblock on dev.
933 * if refdev != NULL, compare superblocks on both devices
934 * Return:
935 * 0 - dev has a superblock that is compatible with refdev
936 * 1 - dev has a superblock that is compatible and newer than refdev
937 * so dev should be used as the refdev in future
938 * -EINVAL superblock incompatible or invalid
939 * -othererror e.g. -EIO
940 *
941 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
942 * Verify that dev is acceptable into mddev.
943 * The first time, mddev->raid_disks will be 0, and data from
944 * dev should be merged in. Subsequent calls check that dev
945 * is new enough. Return 0 or -EINVAL
946 *
947 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
948 * Update the superblock for rdev with data in mddev
949 * This does not write to disc.
950 *
951 */
952
953struct super_type {
0cd17fec
CW
954 char *name;
955 struct module *owner;
956 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
957 int minor_version);
958 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
959 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
960 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
15f4a5fd 961 sector_t num_sectors);
1da177e4
LT
962};
963
0894cc30
AN
964/*
965 * Check that the given mddev has no bitmap.
966 *
967 * This function is called from the run method of all personalities that do not
968 * support bitmaps. It prints an error message and returns non-zero if mddev
969 * has a bitmap. Otherwise, it returns 0.
970 *
971 */
972int md_check_no_bitmap(mddev_t *mddev)
973{
c3d9714e 974 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
0894cc30
AN
975 return 0;
976 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
977 mdname(mddev), mddev->pers->name);
978 return 1;
979}
980EXPORT_SYMBOL(md_check_no_bitmap);
981
1da177e4
LT
982/*
983 * load_super for 0.90.0
984 */
985static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
986{
987 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
988 mdp_super_t *sb;
989 int ret;
1da177e4
LT
990
991 /*
0f420358 992 * Calculate the position of the superblock (512byte sectors),
1da177e4
LT
993 * it's at the end of the disk.
994 *
995 * It also happens to be a multiple of 4Kb.
996 */
57b2caa3 997 rdev->sb_start = calc_dev_sboffset(rdev);
1da177e4 998
0002b271 999 ret = read_disk_sb(rdev, MD_SB_BYTES);
1da177e4
LT
1000 if (ret) return ret;
1001
1002 ret = -EINVAL;
1003
1004 bdevname(rdev->bdev, b);
1005 sb = (mdp_super_t*)page_address(rdev->sb_page);
1006
1007 if (sb->md_magic != MD_SB_MAGIC) {
1008 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
1009 b);
1010 goto abort;
1011 }
1012
1013 if (sb->major_version != 0 ||
f6705578
N
1014 sb->minor_version < 90 ||
1015 sb->minor_version > 91) {
1da177e4
LT
1016 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
1017 sb->major_version, sb->minor_version,
1018 b);
1019 goto abort;
1020 }
1021
1022 if (sb->raid_disks <= 0)
1023 goto abort;
1024
4d167f09 1025 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1da177e4
LT
1026 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
1027 b);
1028 goto abort;
1029 }
1030
1031 rdev->preferred_minor = sb->md_minor;
1032 rdev->data_offset = 0;
0002b271 1033 rdev->sb_size = MD_SB_BYTES;
1da177e4
LT
1034
1035 if (sb->level == LEVEL_MULTIPATH)
1036 rdev->desc_nr = -1;
1037 else
1038 rdev->desc_nr = sb->this_disk.number;
1039
9a7b2b0f 1040 if (!refdev) {
1da177e4 1041 ret = 1;
9a7b2b0f 1042 } else {
1da177e4
LT
1043 __u64 ev1, ev2;
1044 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
1045 if (!uuid_equal(refsb, sb)) {
1046 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1047 b, bdevname(refdev->bdev,b2));
1048 goto abort;
1049 }
1050 if (!sb_equal(refsb, sb)) {
1051 printk(KERN_WARNING "md: %s has same UUID"
1052 " but different superblock to %s\n",
1053 b, bdevname(refdev->bdev, b2));
1054 goto abort;
1055 }
1056 ev1 = md_event(sb);
1057 ev2 = md_event(refsb);
1058 if (ev1 > ev2)
1059 ret = 1;
1060 else
1061 ret = 0;
1062 }
8190e754 1063 rdev->sectors = rdev->sb_start;
1da177e4 1064
dd8ac336 1065 if (rdev->sectors < sb->size * 2 && sb->level > 1)
2bf071bf
N
1066 /* "this cannot possibly happen" ... */
1067 ret = -EINVAL;
1068
1da177e4
LT
1069 abort:
1070 return ret;
1071}
1072
1073/*
1074 * validate_super for 0.90.0
1075 */
1076static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1077{
1078 mdp_disk_t *desc;
1079 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
07d84d10 1080 __u64 ev1 = md_event(sb);
1da177e4 1081
41158c7e 1082 rdev->raid_disk = -1;
c5d79adb
N
1083 clear_bit(Faulty, &rdev->flags);
1084 clear_bit(In_sync, &rdev->flags);
1085 clear_bit(WriteMostly, &rdev->flags);
c5d79adb 1086
1da177e4
LT
1087 if (mddev->raid_disks == 0) {
1088 mddev->major_version = 0;
1089 mddev->minor_version = sb->minor_version;
1090 mddev->patch_version = sb->patch_version;
e691063a 1091 mddev->external = 0;
9d8f0363 1092 mddev->chunk_sectors = sb->chunk_size >> 9;
1da177e4
LT
1093 mddev->ctime = sb->ctime;
1094 mddev->utime = sb->utime;
1095 mddev->level = sb->level;
d9d166c2 1096 mddev->clevel[0] = 0;
1da177e4
LT
1097 mddev->layout = sb->layout;
1098 mddev->raid_disks = sb->raid_disks;
58c0fed4 1099 mddev->dev_sectors = sb->size * 2;
07d84d10 1100 mddev->events = ev1;
c3d9714e
N
1101 mddev->bitmap_info.offset = 0;
1102 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1da177e4 1103
f6705578
N
1104 if (mddev->minor_version >= 91) {
1105 mddev->reshape_position = sb->reshape_position;
1106 mddev->delta_disks = sb->delta_disks;
1107 mddev->new_level = sb->new_level;
1108 mddev->new_layout = sb->new_layout;
664e7c41 1109 mddev->new_chunk_sectors = sb->new_chunk >> 9;
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) &&
c3d9714e
N
1136 mddev->bitmap_info.file == NULL)
1137 mddev->bitmap_info.offset =
1138 mddev->bitmap_info.default_offset;
a654b9d8 1139
41158c7e 1140 } else if (mddev->pers == NULL) {
be6800a7
N
1141 /* Insist on good event counter while assembling, except
1142 * for spares (which don't need an event count) */
1da177e4 1143 ++ev1;
be6800a7
N
1144 if (sb->disks[rdev->desc_nr].state & (
1145 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1146 if (ev1 < mddev->events)
1147 return -EINVAL;
41158c7e
N
1148 } else if (mddev->bitmap) {
1149 /* if adding to array with a bitmap, then we can accept an
1150 * older device ... but not too old.
1151 */
41158c7e
N
1152 if (ev1 < mddev->bitmap->events_cleared)
1153 return 0;
07d84d10
N
1154 } else {
1155 if (ev1 < mddev->events)
1156 /* just a hot-add of a new device, leave raid_disk at -1 */
1157 return 0;
1158 }
41158c7e 1159
1da177e4 1160 if (mddev->level != LEVEL_MULTIPATH) {
1da177e4
LT
1161 desc = sb->disks + rdev->desc_nr;
1162
1163 if (desc->state & (1<<MD_DISK_FAULTY))
b2d444d7 1164 set_bit(Faulty, &rdev->flags);
7c7546cc
N
1165 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1166 desc->raid_disk < mddev->raid_disks */) {
b2d444d7 1167 set_bit(In_sync, &rdev->flags);
1da177e4 1168 rdev->raid_disk = desc->raid_disk;
0261cd9f
N
1169 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1170 /* active but not in sync implies recovery up to
1171 * reshape position. We don't know exactly where
1172 * that is, so set to zero for now */
1173 if (mddev->minor_version >= 91) {
1174 rdev->recovery_offset = 0;
1175 rdev->raid_disk = desc->raid_disk;
1176 }
1da177e4 1177 }
8ddf9efe
N
1178 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1179 set_bit(WriteMostly, &rdev->flags);
41158c7e 1180 } else /* MULTIPATH are always insync */
b2d444d7 1181 set_bit(In_sync, &rdev->flags);
1da177e4
LT
1182 return 0;
1183}
1184
1185/*
1186 * sync_super for 0.90.0
1187 */
1188static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1189{
1190 mdp_super_t *sb;
1da177e4
LT
1191 mdk_rdev_t *rdev2;
1192 int next_spare = mddev->raid_disks;
19133a42 1193
1da177e4
LT
1194
1195 /* make rdev->sb match mddev data..
1196 *
1197 * 1/ zero out disks
1198 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1199 * 3/ any empty disks < next_spare become removed
1200 *
1201 * disks[0] gets initialised to REMOVED because
1202 * we cannot be sure from other fields if it has
1203 * been initialised or not.
1204 */
1205 int i;
1206 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1207
61181565
N
1208 rdev->sb_size = MD_SB_BYTES;
1209
1da177e4
LT
1210 sb = (mdp_super_t*)page_address(rdev->sb_page);
1211
1212 memset(sb, 0, sizeof(*sb));
1213
1214 sb->md_magic = MD_SB_MAGIC;
1215 sb->major_version = mddev->major_version;
1da177e4
LT
1216 sb->patch_version = mddev->patch_version;
1217 sb->gvalid_words = 0; /* ignored */
1218 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1219 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1220 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1221 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1222
1223 sb->ctime = mddev->ctime;
1224 sb->level = mddev->level;
58c0fed4 1225 sb->size = mddev->dev_sectors / 2;
1da177e4
LT
1226 sb->raid_disks = mddev->raid_disks;
1227 sb->md_minor = mddev->md_minor;
e691063a 1228 sb->not_persistent = 0;
1da177e4
LT
1229 sb->utime = mddev->utime;
1230 sb->state = 0;
1231 sb->events_hi = (mddev->events>>32);
1232 sb->events_lo = (u32)mddev->events;
1233
f6705578
N
1234 if (mddev->reshape_position == MaxSector)
1235 sb->minor_version = 90;
1236 else {
1237 sb->minor_version = 91;
1238 sb->reshape_position = mddev->reshape_position;
1239 sb->new_level = mddev->new_level;
1240 sb->delta_disks = mddev->delta_disks;
1241 sb->new_layout = mddev->new_layout;
664e7c41 1242 sb->new_chunk = mddev->new_chunk_sectors << 9;
f6705578
N
1243 }
1244 mddev->minor_version = sb->minor_version;
1da177e4
LT
1245 if (mddev->in_sync)
1246 {
1247 sb->recovery_cp = mddev->recovery_cp;
1248 sb->cp_events_hi = (mddev->events>>32);
1249 sb->cp_events_lo = (u32)mddev->events;
1250 if (mddev->recovery_cp == MaxSector)
1251 sb->state = (1<< MD_SB_CLEAN);
1252 } else
1253 sb->recovery_cp = 0;
1254
1255 sb->layout = mddev->layout;
9d8f0363 1256 sb->chunk_size = mddev->chunk_sectors << 9;
1da177e4 1257
c3d9714e 1258 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
a654b9d8
N
1259 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1260
1da177e4 1261 sb->disks[0].state = (1<<MD_DISK_REMOVED);
159ec1fc 1262 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1da177e4 1263 mdp_disk_t *d;
86e6ffdd 1264 int desc_nr;
0261cd9f
N
1265 int is_active = test_bit(In_sync, &rdev2->flags);
1266
1267 if (rdev2->raid_disk >= 0 &&
1268 sb->minor_version >= 91)
1269 /* we have nowhere to store the recovery_offset,
1270 * but if it is not below the reshape_position,
1271 * we can piggy-back on that.
1272 */
1273 is_active = 1;
1274 if (rdev2->raid_disk < 0 ||
1275 test_bit(Faulty, &rdev2->flags))
1276 is_active = 0;
1277 if (is_active)
86e6ffdd 1278 desc_nr = rdev2->raid_disk;
1da177e4 1279 else
86e6ffdd 1280 desc_nr = next_spare++;
19133a42 1281 rdev2->desc_nr = desc_nr;
1da177e4
LT
1282 d = &sb->disks[rdev2->desc_nr];
1283 nr_disks++;
1284 d->number = rdev2->desc_nr;
1285 d->major = MAJOR(rdev2->bdev->bd_dev);
1286 d->minor = MINOR(rdev2->bdev->bd_dev);
0261cd9f 1287 if (is_active)
1da177e4
LT
1288 d->raid_disk = rdev2->raid_disk;
1289 else
1290 d->raid_disk = rdev2->desc_nr; /* compatibility */
1be7892f 1291 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1292 d->state = (1<<MD_DISK_FAULTY);
0261cd9f 1293 else if (is_active) {
1da177e4 1294 d->state = (1<<MD_DISK_ACTIVE);
0261cd9f
N
1295 if (test_bit(In_sync, &rdev2->flags))
1296 d->state |= (1<<MD_DISK_SYNC);
1da177e4
LT
1297 active++;
1298 working++;
1299 } else {
1300 d->state = 0;
1301 spare++;
1302 working++;
1303 }
8ddf9efe
N
1304 if (test_bit(WriteMostly, &rdev2->flags))
1305 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4 1306 }
1da177e4
LT
1307 /* now set the "removed" and "faulty" bits on any missing devices */
1308 for (i=0 ; i < mddev->raid_disks ; i++) {
1309 mdp_disk_t *d = &sb->disks[i];
1310 if (d->state == 0 && d->number == 0) {
1311 d->number = i;
1312 d->raid_disk = i;
1313 d->state = (1<<MD_DISK_REMOVED);
1314 d->state |= (1<<MD_DISK_FAULTY);
1315 failed++;
1316 }
1317 }
1318 sb->nr_disks = nr_disks;
1319 sb->active_disks = active;
1320 sb->working_disks = working;
1321 sb->failed_disks = failed;
1322 sb->spare_disks = spare;
1323
1324 sb->this_disk = sb->disks[rdev->desc_nr];
1325 sb->sb_csum = calc_sb_csum(sb);
1326}
1327
0cd17fec
CW
1328/*
1329 * rdev_size_change for 0.90.0
1330 */
1331static unsigned long long
15f4a5fd 1332super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
0cd17fec 1333{
58c0fed4 1334 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
0cd17fec 1335 return 0; /* component must fit device */
c3d9714e 1336 if (rdev->mddev->bitmap_info.offset)
0cd17fec 1337 return 0; /* can't move bitmap */
57b2caa3 1338 rdev->sb_start = calc_dev_sboffset(rdev);
15f4a5fd
AN
1339 if (!num_sectors || num_sectors > rdev->sb_start)
1340 num_sectors = rdev->sb_start;
0f420358 1341 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
0cd17fec
CW
1342 rdev->sb_page);
1343 md_super_wait(rdev->mddev);
c26a44ed 1344 return num_sectors;
0cd17fec
CW
1345}
1346
1347
1da177e4
LT
1348/*
1349 * version 1 superblock
1350 */
1351
1c05b4bc 1352static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1da177e4 1353{
1c05b4bc
N
1354 __le32 disk_csum;
1355 u32 csum;
1da177e4
LT
1356 unsigned long long newcsum;
1357 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1c05b4bc 1358 __le32 *isuper = (__le32*)sb;
1da177e4
LT
1359 int i;
1360
1361 disk_csum = sb->sb_csum;
1362 sb->sb_csum = 0;
1363 newcsum = 0;
1364 for (i=0; size>=4; size -= 4 )
1365 newcsum += le32_to_cpu(*isuper++);
1366
1367 if (size == 2)
1c05b4bc 1368 newcsum += le16_to_cpu(*(__le16*) isuper);
1da177e4
LT
1369
1370 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1371 sb->sb_csum = disk_csum;
1372 return cpu_to_le32(csum);
1373}
1374
1375static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1376{
1377 struct mdp_superblock_1 *sb;
1378 int ret;
0f420358 1379 sector_t sb_start;
1da177e4 1380 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 1381 int bmask;
1da177e4
LT
1382
1383 /*
0f420358 1384 * Calculate the position of the superblock in 512byte sectors.
1da177e4
LT
1385 * It is always aligned to a 4K boundary and
1386 * depeding on minor_version, it can be:
1387 * 0: At least 8K, but less than 12K, from end of device
1388 * 1: At start of device
1389 * 2: 4K from start of device.
1390 */
1391 switch(minor_version) {
1392 case 0:
77304d2a 1393 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
0f420358
AN
1394 sb_start -= 8*2;
1395 sb_start &= ~(sector_t)(4*2-1);
1da177e4
LT
1396 break;
1397 case 1:
0f420358 1398 sb_start = 0;
1da177e4
LT
1399 break;
1400 case 2:
0f420358 1401 sb_start = 8;
1da177e4
LT
1402 break;
1403 default:
1404 return -EINVAL;
1405 }
0f420358 1406 rdev->sb_start = sb_start;
1da177e4 1407
0002b271
N
1408 /* superblock is rarely larger than 1K, but it can be larger,
1409 * and it is safe to read 4k, so we do that
1410 */
1411 ret = read_disk_sb(rdev, 4096);
1da177e4
LT
1412 if (ret) return ret;
1413
1414
1415 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1416
1417 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1418 sb->major_version != cpu_to_le32(1) ||
1419 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
0f420358 1420 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
71c0805c 1421 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT
1422 return -EINVAL;
1423
1424 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1425 printk("md: invalid superblock checksum on %s\n",
1426 bdevname(rdev->bdev,b));
1427 return -EINVAL;
1428 }
1429 if (le64_to_cpu(sb->data_size) < 10) {
1430 printk("md: data_size too small on %s\n",
1431 bdevname(rdev->bdev,b));
1432 return -EINVAL;
1433 }
e11e93fa 1434
1da177e4
LT
1435 rdev->preferred_minor = 0xffff;
1436 rdev->data_offset = le64_to_cpu(sb->data_offset);
4dbcdc75 1437 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1da177e4 1438
0002b271 1439 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
e1defc4f 1440 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
0002b271 1441 if (rdev->sb_size & bmask)
a1801f85
N
1442 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1443
1444 if (minor_version
0f420358 1445 && rdev->data_offset < sb_start + (rdev->sb_size/512))
a1801f85 1446 return -EINVAL;
0002b271 1447
31b65a0d
N
1448 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1449 rdev->desc_nr = -1;
1450 else
1451 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1452
9a7b2b0f 1453 if (!refdev) {
8ed75463 1454 ret = 1;
9a7b2b0f 1455 } else {
1da177e4
LT
1456 __u64 ev1, ev2;
1457 struct mdp_superblock_1 *refsb =
1458 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1459
1460 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1461 sb->level != refsb->level ||
1462 sb->layout != refsb->layout ||
1463 sb->chunksize != refsb->chunksize) {
1464 printk(KERN_WARNING "md: %s has strangely different"
1465 " superblock to %s\n",
1466 bdevname(rdev->bdev,b),
1467 bdevname(refdev->bdev,b2));
1468 return -EINVAL;
1469 }
1470 ev1 = le64_to_cpu(sb->events);
1471 ev2 = le64_to_cpu(refsb->events);
1472
1473 if (ev1 > ev2)
8ed75463
N
1474 ret = 1;
1475 else
1476 ret = 0;
1da177e4 1477 }
a1801f85 1478 if (minor_version)
77304d2a 1479 rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
dd8ac336 1480 le64_to_cpu(sb->data_offset);
1da177e4 1481 else
dd8ac336
AN
1482 rdev->sectors = rdev->sb_start;
1483 if (rdev->sectors < le64_to_cpu(sb->data_size))
1da177e4 1484 return -EINVAL;
dd8ac336 1485 rdev->sectors = le64_to_cpu(sb->data_size);
dd8ac336 1486 if (le64_to_cpu(sb->size) > rdev->sectors)
2bf071bf 1487 return -EINVAL;
8ed75463 1488 return ret;
1da177e4
LT
1489}
1490
1491static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1492{
1493 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
07d84d10 1494 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4 1495
41158c7e 1496 rdev->raid_disk = -1;
c5d79adb
N
1497 clear_bit(Faulty, &rdev->flags);
1498 clear_bit(In_sync, &rdev->flags);
1499 clear_bit(WriteMostly, &rdev->flags);
c5d79adb 1500
1da177e4
LT
1501 if (mddev->raid_disks == 0) {
1502 mddev->major_version = 1;
1503 mddev->patch_version = 0;
e691063a 1504 mddev->external = 0;
9d8f0363 1505 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1da177e4
LT
1506 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1507 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1508 mddev->level = le32_to_cpu(sb->level);
d9d166c2 1509 mddev->clevel[0] = 0;
1da177e4
LT
1510 mddev->layout = le32_to_cpu(sb->layout);
1511 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
58c0fed4 1512 mddev->dev_sectors = le64_to_cpu(sb->size);
07d84d10 1513 mddev->events = ev1;
c3d9714e
N
1514 mddev->bitmap_info.offset = 0;
1515 mddev->bitmap_info.default_offset = 1024 >> 9;
1da177e4
LT
1516
1517 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1518 memcpy(mddev->uuid, sb->set_uuid, 16);
1519
1520 mddev->max_disks = (4096-256)/2;
a654b9d8 1521
71c0805c 1522 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
c3d9714e
N
1523 mddev->bitmap_info.file == NULL )
1524 mddev->bitmap_info.offset =
1525 (__s32)le32_to_cpu(sb->bitmap_offset);
e11e93fa 1526
f6705578
N
1527 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1528 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1529 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1530 mddev->new_level = le32_to_cpu(sb->new_level);
1531 mddev->new_layout = le32_to_cpu(sb->new_layout);
664e7c41 1532 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
f6705578
N
1533 } else {
1534 mddev->reshape_position = MaxSector;
1535 mddev->delta_disks = 0;
1536 mddev->new_level = mddev->level;
1537 mddev->new_layout = mddev->layout;
664e7c41 1538 mddev->new_chunk_sectors = mddev->chunk_sectors;
f6705578
N
1539 }
1540
41158c7e 1541 } else if (mddev->pers == NULL) {
be6800a7
N
1542 /* Insist of good event counter while assembling, except for
1543 * spares (which don't need an event count) */
1da177e4 1544 ++ev1;
be6800a7
N
1545 if (rdev->desc_nr >= 0 &&
1546 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1547 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1548 if (ev1 < mddev->events)
1549 return -EINVAL;
41158c7e
N
1550 } else if (mddev->bitmap) {
1551 /* If adding to array with a bitmap, then we can accept an
1552 * older device, but not too old.
1553 */
41158c7e
N
1554 if (ev1 < mddev->bitmap->events_cleared)
1555 return 0;
07d84d10
N
1556 } else {
1557 if (ev1 < mddev->events)
1558 /* just a hot-add of a new device, leave raid_disk at -1 */
1559 return 0;
1560 }
1da177e4
LT
1561 if (mddev->level != LEVEL_MULTIPATH) {
1562 int role;
3673f305
N
1563 if (rdev->desc_nr < 0 ||
1564 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1565 role = 0xffff;
1566 rdev->desc_nr = -1;
1567 } else
1568 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1da177e4
LT
1569 switch(role) {
1570 case 0xffff: /* spare */
1da177e4
LT
1571 break;
1572 case 0xfffe: /* faulty */
b2d444d7 1573 set_bit(Faulty, &rdev->flags);
1da177e4
LT
1574 break;
1575 default:
5fd6c1dc
N
1576 if ((le32_to_cpu(sb->feature_map) &
1577 MD_FEATURE_RECOVERY_OFFSET))
1578 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1579 else
1580 set_bit(In_sync, &rdev->flags);
1da177e4
LT
1581 rdev->raid_disk = role;
1582 break;
1583 }
8ddf9efe
N
1584 if (sb->devflags & WriteMostly1)
1585 set_bit(WriteMostly, &rdev->flags);
41158c7e 1586 } else /* MULTIPATH are always insync */
b2d444d7 1587 set_bit(In_sync, &rdev->flags);
41158c7e 1588
1da177e4
LT
1589 return 0;
1590}
1591
1592static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1593{
1594 struct mdp_superblock_1 *sb;
1da177e4
LT
1595 mdk_rdev_t *rdev2;
1596 int max_dev, i;
1597 /* make rdev->sb match mddev and rdev data. */
1598
1599 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1600
1601 sb->feature_map = 0;
1602 sb->pad0 = 0;
5fd6c1dc 1603 sb->recovery_offset = cpu_to_le64(0);
1da177e4
LT
1604 memset(sb->pad1, 0, sizeof(sb->pad1));
1605 memset(sb->pad2, 0, sizeof(sb->pad2));
1606 memset(sb->pad3, 0, sizeof(sb->pad3));
1607
1608 sb->utime = cpu_to_le64((__u64)mddev->utime);
1609 sb->events = cpu_to_le64(mddev->events);
1610 if (mddev->in_sync)
1611 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1612 else
1613 sb->resync_offset = cpu_to_le64(0);
1614
1c05b4bc 1615 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
4dbcdc75 1616
f0ca340c 1617 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
58c0fed4 1618 sb->size = cpu_to_le64(mddev->dev_sectors);
9d8f0363 1619 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
62e1e389
N
1620 sb->level = cpu_to_le32(mddev->level);
1621 sb->layout = cpu_to_le32(mddev->layout);
f0ca340c 1622
c3d9714e
N
1623 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1624 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
71c0805c 1625 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8 1626 }
5fd6c1dc
N
1627
1628 if (rdev->raid_disk >= 0 &&
97e4f42d 1629 !test_bit(In_sync, &rdev->flags)) {
93be75ff
N
1630 sb->feature_map |=
1631 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1632 sb->recovery_offset =
1633 cpu_to_le64(rdev->recovery_offset);
5fd6c1dc
N
1634 }
1635
f6705578
N
1636 if (mddev->reshape_position != MaxSector) {
1637 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1638 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1639 sb->new_layout = cpu_to_le32(mddev->new_layout);
1640 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1641 sb->new_level = cpu_to_le32(mddev->new_level);
664e7c41 1642 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
f6705578 1643 }
a654b9d8 1644
1da177e4 1645 max_dev = 0;
159ec1fc 1646 list_for_each_entry(rdev2, &mddev->disks, same_set)
1da177e4
LT
1647 if (rdev2->desc_nr+1 > max_dev)
1648 max_dev = rdev2->desc_nr+1;
a778b73f 1649
70471daf
N
1650 if (max_dev > le32_to_cpu(sb->max_dev)) {
1651 int bmask;
a778b73f 1652 sb->max_dev = cpu_to_le32(max_dev);
70471daf
N
1653 rdev->sb_size = max_dev * 2 + 256;
1654 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1655 if (rdev->sb_size & bmask)
1656 rdev->sb_size = (rdev->sb_size | bmask) + 1;
ddcf3522
N
1657 } else
1658 max_dev = le32_to_cpu(sb->max_dev);
1659
1da177e4
LT
1660 for (i=0; i<max_dev;i++)
1661 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1662
159ec1fc 1663 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1da177e4 1664 i = rdev2->desc_nr;
b2d444d7 1665 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1666 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1667 else if (test_bit(In_sync, &rdev2->flags))
1da177e4 1668 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
93be75ff 1669 else if (rdev2->raid_disk >= 0)
5fd6c1dc 1670 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1da177e4
LT
1671 else
1672 sb->dev_roles[i] = cpu_to_le16(0xffff);
1673 }
1674
1da177e4
LT
1675 sb->sb_csum = calc_sb_1_csum(sb);
1676}
1677
0cd17fec 1678static unsigned long long
15f4a5fd 1679super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
0cd17fec
CW
1680{
1681 struct mdp_superblock_1 *sb;
15f4a5fd 1682 sector_t max_sectors;
58c0fed4 1683 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
0cd17fec 1684 return 0; /* component must fit device */
0f420358 1685 if (rdev->sb_start < rdev->data_offset) {
0cd17fec 1686 /* minor versions 1 and 2; superblock before data */
77304d2a 1687 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
15f4a5fd
AN
1688 max_sectors -= rdev->data_offset;
1689 if (!num_sectors || num_sectors > max_sectors)
1690 num_sectors = max_sectors;
c3d9714e 1691 } else if (rdev->mddev->bitmap_info.offset) {
0cd17fec
CW
1692 /* minor version 0 with bitmap we can't move */
1693 return 0;
1694 } else {
1695 /* minor version 0; superblock after data */
0f420358 1696 sector_t sb_start;
77304d2a 1697 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
0f420358 1698 sb_start &= ~(sector_t)(4*2 - 1);
dd8ac336 1699 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
15f4a5fd
AN
1700 if (!num_sectors || num_sectors > max_sectors)
1701 num_sectors = max_sectors;
0f420358 1702 rdev->sb_start = sb_start;
0cd17fec
CW
1703 }
1704 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
15f4a5fd 1705 sb->data_size = cpu_to_le64(num_sectors);
0f420358 1706 sb->super_offset = rdev->sb_start;
0cd17fec 1707 sb->sb_csum = calc_sb_1_csum(sb);
0f420358 1708 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
0cd17fec
CW
1709 rdev->sb_page);
1710 md_super_wait(rdev->mddev);
c26a44ed 1711 return num_sectors;
0cd17fec 1712}
1da177e4 1713
75c96f85 1714static struct super_type super_types[] = {
1da177e4
LT
1715 [0] = {
1716 .name = "0.90.0",
1717 .owner = THIS_MODULE,
0cd17fec
CW
1718 .load_super = super_90_load,
1719 .validate_super = super_90_validate,
1720 .sync_super = super_90_sync,
1721 .rdev_size_change = super_90_rdev_size_change,
1da177e4
LT
1722 },
1723 [1] = {
1724 .name = "md-1",
1725 .owner = THIS_MODULE,
0cd17fec
CW
1726 .load_super = super_1_load,
1727 .validate_super = super_1_validate,
1728 .sync_super = super_1_sync,
1729 .rdev_size_change = super_1_rdev_size_change,
1da177e4
LT
1730 },
1731};
1da177e4
LT
1732
1733static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1734{
7dd5e7c3 1735 mdk_rdev_t *rdev, *rdev2;
1da177e4 1736
4b80991c
N
1737 rcu_read_lock();
1738 rdev_for_each_rcu(rdev, mddev1)
1739 rdev_for_each_rcu(rdev2, mddev2)
7dd5e7c3 1740 if (rdev->bdev->bd_contains ==
4b80991c
N
1741 rdev2->bdev->bd_contains) {
1742 rcu_read_unlock();
7dd5e7c3 1743 return 1;
4b80991c
N
1744 }
1745 rcu_read_unlock();
1da177e4
LT
1746 return 0;
1747}
1748
1749static LIST_HEAD(pending_raid_disks);
1750
ac5e7113
AN
1751/*
1752 * Try to register data integrity profile for an mddev
1753 *
1754 * This is called when an array is started and after a disk has been kicked
1755 * from the array. It only succeeds if all working and active component devices
1756 * are integrity capable with matching profiles.
1757 */
1758int md_integrity_register(mddev_t *mddev)
1759{
1760 mdk_rdev_t *rdev, *reference = NULL;
1761
1762 if (list_empty(&mddev->disks))
1763 return 0; /* nothing to do */
1764 if (blk_get_integrity(mddev->gendisk))
1765 return 0; /* already registered */
1766 list_for_each_entry(rdev, &mddev->disks, same_set) {
1767 /* skip spares and non-functional disks */
1768 if (test_bit(Faulty, &rdev->flags))
1769 continue;
1770 if (rdev->raid_disk < 0)
1771 continue;
1772 /*
1773 * If at least one rdev is not integrity capable, we can not
1774 * enable data integrity for the md device.
1775 */
1776 if (!bdev_get_integrity(rdev->bdev))
1777 return -EINVAL;
1778 if (!reference) {
1779 /* Use the first rdev as the reference */
1780 reference = rdev;
1781 continue;
1782 }
1783 /* does this rdev's profile match the reference profile? */
1784 if (blk_integrity_compare(reference->bdev->bd_disk,
1785 rdev->bdev->bd_disk) < 0)
1786 return -EINVAL;
1787 }
1788 /*
1789 * All component devices are integrity capable and have matching
1790 * profiles, register the common profile for the md device.
1791 */
1792 if (blk_integrity_register(mddev->gendisk,
1793 bdev_get_integrity(reference->bdev)) != 0) {
1794 printk(KERN_ERR "md: failed to register integrity for %s\n",
1795 mdname(mddev));
1796 return -EINVAL;
1797 }
1798 printk(KERN_NOTICE "md: data integrity on %s enabled\n",
1799 mdname(mddev));
1800 return 0;
1801}
1802EXPORT_SYMBOL(md_integrity_register);
1803
1804/* Disable data integrity if non-capable/non-matching disk is being added */
1805void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
3f9d99c1 1806{
3f9d99c1 1807 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
ac5e7113 1808 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
3f9d99c1 1809
ac5e7113 1810 if (!bi_mddev) /* nothing to do */
3f9d99c1 1811 return;
ac5e7113 1812 if (rdev->raid_disk < 0) /* skip spares */
3f9d99c1 1813 return;
ac5e7113
AN
1814 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1815 rdev->bdev->bd_disk) >= 0)
1816 return;
1817 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
1818 blk_integrity_unregister(mddev->gendisk);
3f9d99c1 1819}
ac5e7113 1820EXPORT_SYMBOL(md_integrity_add_rdev);
3f9d99c1 1821
1da177e4
LT
1822static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1823{
7dd5e7c3 1824 char b[BDEVNAME_SIZE];
f637b9f9 1825 struct kobject *ko;
1edf80d3 1826 char *s;
5e55e2f5 1827 int err;
1da177e4
LT
1828
1829 if (rdev->mddev) {
1830 MD_BUG();
1831 return -EINVAL;
1832 }
11e2ede0
DW
1833
1834 /* prevent duplicates */
1835 if (find_rdev(mddev, rdev->bdev->bd_dev))
1836 return -EEXIST;
1837
dd8ac336
AN
1838 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1839 if (rdev->sectors && (mddev->dev_sectors == 0 ||
1840 rdev->sectors < mddev->dev_sectors)) {
a778b73f
N
1841 if (mddev->pers) {
1842 /* Cannot change size, so fail
1843 * If mddev->level <= 0, then we don't care
1844 * about aligning sizes (e.g. linear)
1845 */
1846 if (mddev->level > 0)
1847 return -ENOSPC;
1848 } else
dd8ac336 1849 mddev->dev_sectors = rdev->sectors;
2bf071bf 1850 }
1da177e4
LT
1851
1852 /* Verify rdev->desc_nr is unique.
1853 * If it is -1, assign a free number, else
1854 * check number is not in use
1855 */
1856 if (rdev->desc_nr < 0) {
1857 int choice = 0;
1858 if (mddev->pers) choice = mddev->raid_disks;
1859 while (find_rdev_nr(mddev, choice))
1860 choice++;
1861 rdev->desc_nr = choice;
1862 } else {
1863 if (find_rdev_nr(mddev, rdev->desc_nr))
1864 return -EBUSY;
1865 }
de01dfad
N
1866 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1867 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1868 mdname(mddev), mddev->max_disks);
1869 return -EBUSY;
1870 }
19133a42 1871 bdevname(rdev->bdev,b);
649316b2 1872 while ( (s=strchr(b, '/')) != NULL)
1edf80d3 1873 *s = '!';
649316b2 1874
1da177e4 1875 rdev->mddev = mddev;
19133a42 1876 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 1877
b2d6db58 1878 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
5e55e2f5 1879 goto fail;
86e6ffdd 1880
0762b8bd 1881 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
00bcb4ac
N
1882 if (sysfs_create_link(&rdev->kobj, ko, "block"))
1883 /* failure here is OK */;
1884 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
3c0ee63a 1885
4b80991c 1886 list_add_rcu(&rdev->same_set, &mddev->disks);
c5d79adb 1887 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
4044ba58
N
1888
1889 /* May as well allow recovery to be retried once */
1890 mddev->recovery_disabled = 0;
3f9d99c1 1891
1da177e4 1892 return 0;
5e55e2f5
N
1893
1894 fail:
1895 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1896 b, mdname(mddev));
1897 return err;
1da177e4
LT
1898}
1899
177a99b2 1900static void md_delayed_delete(struct work_struct *ws)
5792a285
N
1901{
1902 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1903 kobject_del(&rdev->kobj);
177a99b2 1904 kobject_put(&rdev->kobj);
5792a285
N
1905}
1906
1da177e4
LT
1907static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1908{
1909 char b[BDEVNAME_SIZE];
1910 if (!rdev->mddev) {
1911 MD_BUG();
1912 return;
1913 }
5463c790 1914 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
4b80991c 1915 list_del_rcu(&rdev->same_set);
1da177e4
LT
1916 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1917 rdev->mddev = NULL;
86e6ffdd 1918 sysfs_remove_link(&rdev->kobj, "block");
3c0ee63a
N
1919 sysfs_put(rdev->sysfs_state);
1920 rdev->sysfs_state = NULL;
5792a285 1921 /* We need to delay this, otherwise we can deadlock when
4b80991c
N
1922 * writing to 'remove' to "dev/state". We also need
1923 * to delay it due to rcu usage.
5792a285 1924 */
4b80991c 1925 synchronize_rcu();
177a99b2
N
1926 INIT_WORK(&rdev->del_work, md_delayed_delete);
1927 kobject_get(&rdev->kobj);
e804ac78 1928 queue_work(md_misc_wq, &rdev->del_work);
1da177e4
LT
1929}
1930
1931/*
1932 * prevent the device from being mounted, repartitioned or
1933 * otherwise reused by a RAID array (or any other kernel
1934 * subsystem), by bd_claiming the device.
1935 */
c5d79adb 1936static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1da177e4
LT
1937{
1938 int err = 0;
1939 struct block_device *bdev;
1940 char b[BDEVNAME_SIZE];
1941
2e7b651d 1942 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1da177e4
LT
1943 if (IS_ERR(bdev)) {
1944 printk(KERN_ERR "md: could not open %s.\n",
1945 __bdevname(dev, b));
1946 return PTR_ERR(bdev);
1947 }
c5d79adb 1948 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1da177e4
LT
1949 if (err) {
1950 printk(KERN_ERR "md: could not bd_claim %s.\n",
1951 bdevname(bdev, b));
9a1c3542 1952 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1da177e4
LT
1953 return err;
1954 }
c5d79adb
N
1955 if (!shared)
1956 set_bit(AllReserved, &rdev->flags);
1da177e4
LT
1957 rdev->bdev = bdev;
1958 return err;
1959}
1960
1961static void unlock_rdev(mdk_rdev_t *rdev)
1962{
1963 struct block_device *bdev = rdev->bdev;
1964 rdev->bdev = NULL;
1965 if (!bdev)
1966 MD_BUG();
1967 bd_release(bdev);
9a1c3542 1968 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1da177e4
LT
1969}
1970
1971void md_autodetect_dev(dev_t dev);
1972
1973static void export_rdev(mdk_rdev_t * rdev)
1974{
1975 char b[BDEVNAME_SIZE];
1976 printk(KERN_INFO "md: export_rdev(%s)\n",
1977 bdevname(rdev->bdev,b));
1978 if (rdev->mddev)
1979 MD_BUG();
1980 free_disk_sb(rdev);
1da177e4 1981#ifndef MODULE
d0fae18f
N
1982 if (test_bit(AutoDetected, &rdev->flags))
1983 md_autodetect_dev(rdev->bdev->bd_dev);
1da177e4
LT
1984#endif
1985 unlock_rdev(rdev);
86e6ffdd 1986 kobject_put(&rdev->kobj);
1da177e4
LT
1987}
1988
1989static void kick_rdev_from_array(mdk_rdev_t * rdev)
1990{
1991 unbind_rdev_from_array(rdev);
1992 export_rdev(rdev);
1993}
1994
1995static void export_array(mddev_t *mddev)
1996{
159ec1fc 1997 mdk_rdev_t *rdev, *tmp;
1da177e4 1998
d089c6af 1999 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT
2000 if (!rdev->mddev) {
2001 MD_BUG();
2002 continue;
2003 }
2004 kick_rdev_from_array(rdev);
2005 }
2006 if (!list_empty(&mddev->disks))
2007 MD_BUG();
2008 mddev->raid_disks = 0;
2009 mddev->major_version = 0;
2010}
2011
2012static void print_desc(mdp_disk_t *desc)
2013{
2014 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
2015 desc->major,desc->minor,desc->raid_disk,desc->state);
2016}
2017
cd2ac932 2018static void print_sb_90(mdp_super_t *sb)
1da177e4
LT
2019{
2020 int i;
2021
2022 printk(KERN_INFO
2023 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2024 sb->major_version, sb->minor_version, sb->patch_version,
2025 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
2026 sb->ctime);
2027 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2028 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
2029 sb->md_minor, sb->layout, sb->chunk_size);
2030 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
2031 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2032 sb->utime, sb->state, sb->active_disks, sb->working_disks,
2033 sb->failed_disks, sb->spare_disks,
2034 sb->sb_csum, (unsigned long)sb->events_lo);
2035
2036 printk(KERN_INFO);
2037 for (i = 0; i < MD_SB_DISKS; i++) {
2038 mdp_disk_t *desc;
2039
2040 desc = sb->disks + i;
2041 if (desc->number || desc->major || desc->minor ||
2042 desc->raid_disk || (desc->state && (desc->state != 4))) {
2043 printk(" D %2d: ", i);
2044 print_desc(desc);
2045 }
2046 }
2047 printk(KERN_INFO "md: THIS: ");
2048 print_desc(&sb->this_disk);
cd2ac932 2049}
1da177e4 2050
cd2ac932
CR
2051static void print_sb_1(struct mdp_superblock_1 *sb)
2052{
2053 __u8 *uuid;
2054
2055 uuid = sb->set_uuid;
ad361c98 2056 printk(KERN_INFO
7b75c2f8 2057 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
ad361c98 2058 "md: Name: \"%s\" CT:%llu\n",
cd2ac932
CR
2059 le32_to_cpu(sb->major_version),
2060 le32_to_cpu(sb->feature_map),
7b75c2f8 2061 uuid,
cd2ac932
CR
2062 sb->set_name,
2063 (unsigned long long)le64_to_cpu(sb->ctime)
2064 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
2065
2066 uuid = sb->device_uuid;
ad361c98
JP
2067 printk(KERN_INFO
2068 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
cd2ac932 2069 " RO:%llu\n"
7b75c2f8 2070 "md: Dev:%08x UUID: %pU\n"
ad361c98
JP
2071 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2072 "md: (MaxDev:%u) \n",
cd2ac932
CR
2073 le32_to_cpu(sb->level),
2074 (unsigned long long)le64_to_cpu(sb->size),
2075 le32_to_cpu(sb->raid_disks),
2076 le32_to_cpu(sb->layout),
2077 le32_to_cpu(sb->chunksize),
2078 (unsigned long long)le64_to_cpu(sb->data_offset),
2079 (unsigned long long)le64_to_cpu(sb->data_size),
2080 (unsigned long long)le64_to_cpu(sb->super_offset),
2081 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2082 le32_to_cpu(sb->dev_number),
7b75c2f8 2083 uuid,
cd2ac932
CR
2084 sb->devflags,
2085 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2086 (unsigned long long)le64_to_cpu(sb->events),
2087 (unsigned long long)le64_to_cpu(sb->resync_offset),
2088 le32_to_cpu(sb->sb_csum),
2089 le32_to_cpu(sb->max_dev)
2090 );
1da177e4
LT
2091}
2092
cd2ac932 2093static void print_rdev(mdk_rdev_t *rdev, int major_version)
1da177e4
LT
2094{
2095 char b[BDEVNAME_SIZE];
dd8ac336
AN
2096 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2097 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
b2d444d7
N
2098 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2099 rdev->desc_nr);
1da177e4 2100 if (rdev->sb_loaded) {
cd2ac932
CR
2101 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2102 switch (major_version) {
2103 case 0:
2104 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
2105 break;
2106 case 1:
2107 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
2108 break;
2109 }
1da177e4
LT
2110 } else
2111 printk(KERN_INFO "md: no rdev superblock!\n");
2112}
2113
5e56341d 2114static void md_print_devices(void)
1da177e4 2115{
159ec1fc 2116 struct list_head *tmp;
1da177e4
LT
2117 mdk_rdev_t *rdev;
2118 mddev_t *mddev;
2119 char b[BDEVNAME_SIZE];
2120
2121 printk("\n");
2122 printk("md: **********************************\n");
2123 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2124 printk("md: **********************************\n");
29ac4aa3 2125 for_each_mddev(mddev, tmp) {
1da177e4 2126
32a7627c
N
2127 if (mddev->bitmap)
2128 bitmap_print_sb(mddev->bitmap);
2129 else
2130 printk("%s: ", mdname(mddev));
159ec1fc 2131 list_for_each_entry(rdev, &mddev->disks, same_set)
1da177e4
LT
2132 printk("<%s>", bdevname(rdev->bdev,b));
2133 printk("\n");
2134
159ec1fc 2135 list_for_each_entry(rdev, &mddev->disks, same_set)
cd2ac932 2136 print_rdev(rdev, mddev->major_version);
1da177e4
LT
2137 }
2138 printk("md: **********************************\n");
2139 printk("\n");
2140}
2141
2142
42543769 2143static void sync_sbs(mddev_t * mddev, int nospares)
1da177e4 2144{
42543769
N
2145 /* Update each superblock (in-memory image), but
2146 * if we are allowed to, skip spares which already
2147 * have the right event counter, or have one earlier
2148 * (which would mean they aren't being marked as dirty
2149 * with the rest of the array)
2150 */
1da177e4 2151 mdk_rdev_t *rdev;
159ec1fc 2152 list_for_each_entry(rdev, &mddev->disks, same_set) {
42543769
N
2153 if (rdev->sb_events == mddev->events ||
2154 (nospares &&
2155 rdev->raid_disk < 0 &&
42543769
N
2156 rdev->sb_events+1 == mddev->events)) {
2157 /* Don't update this superblock */
2158 rdev->sb_loaded = 2;
2159 } else {
2160 super_types[mddev->major_version].
2161 sync_super(mddev, rdev);
2162 rdev->sb_loaded = 1;
2163 }
1da177e4
LT
2164 }
2165}
2166
850b2b42 2167static void md_update_sb(mddev_t * mddev, int force_change)
1da177e4 2168{
1da177e4 2169 mdk_rdev_t *rdev;
06d91a5f 2170 int sync_req;
42543769 2171 int nospares = 0;
1da177e4 2172
1da177e4 2173repeat:
3a3a5ddb
N
2174 /* First make sure individual recovery_offsets are correct */
2175 list_for_each_entry(rdev, &mddev->disks, same_set) {
2176 if (rdev->raid_disk >= 0 &&
2177 mddev->delta_disks >= 0 &&
2178 !test_bit(In_sync, &rdev->flags) &&
2179 mddev->curr_resync_completed > rdev->recovery_offset)
2180 rdev->recovery_offset = mddev->curr_resync_completed;
2181
2182 }
bd52b746 2183 if (!mddev->persistent) {
070dc6dd 2184 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
3a3a5ddb 2185 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
d97a41dc
N
2186 if (!mddev->external)
2187 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3a3a5ddb
N
2188 wake_up(&mddev->sb_wait);
2189 return;
2190 }
2191
a9701a30 2192 spin_lock_irq(&mddev->write_lock);
84692195 2193
3a3a5ddb
N
2194 mddev->utime = get_seconds();
2195
850b2b42
N
2196 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2197 force_change = 1;
2198 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2199 /* just a clean<-> dirty transition, possibly leave spares alone,
2200 * though if events isn't the right even/odd, we will have to do
2201 * spares after all
2202 */
2203 nospares = 1;
2204 if (force_change)
2205 nospares = 0;
2206 if (mddev->degraded)
84692195
N
2207 /* If the array is degraded, then skipping spares is both
2208 * dangerous and fairly pointless.
2209 * Dangerous because a device that was removed from the array
2210 * might have a event_count that still looks up-to-date,
2211 * so it can be re-added without a resync.
2212 * Pointless because if there are any spares to skip,
2213 * then a recovery will happen and soon that array won't
2214 * be degraded any more and the spare can go back to sleep then.
2215 */
850b2b42 2216 nospares = 0;
84692195 2217
06d91a5f 2218 sync_req = mddev->in_sync;
42543769
N
2219
2220 /* If this is just a dirty<->clean transition, and the array is clean
2221 * and 'events' is odd, we can roll back to the previous clean state */
850b2b42 2222 if (nospares
42543769 2223 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
a8707c08
N
2224 && mddev->can_decrease_events
2225 && mddev->events != 1) {
42543769 2226 mddev->events--;
a8707c08
N
2227 mddev->can_decrease_events = 0;
2228 } else {
42543769
N
2229 /* otherwise we have to go forward and ... */
2230 mddev->events ++;
a8707c08 2231 mddev->can_decrease_events = nospares;
42543769 2232 }
1da177e4
LT
2233
2234 if (!mddev->events) {
2235 /*
2236 * oops, this 64-bit counter should never wrap.
2237 * Either we are in around ~1 trillion A.C., assuming
2238 * 1 reboot per second, or we have a bug:
2239 */
2240 MD_BUG();
2241 mddev->events --;
2242 }
e691063a 2243 sync_sbs(mddev, nospares);
a9701a30 2244 spin_unlock_irq(&mddev->write_lock);
1da177e4
LT
2245
2246 dprintk(KERN_INFO
2247 "md: updating %s RAID superblock on device (in sync %d)\n",
2248 mdname(mddev),mddev->in_sync);
2249
4ad13663 2250 bitmap_update_sb(mddev->bitmap);
159ec1fc 2251 list_for_each_entry(rdev, &mddev->disks, same_set) {
1da177e4
LT
2252 char b[BDEVNAME_SIZE];
2253 dprintk(KERN_INFO "md: ");
42543769
N
2254 if (rdev->sb_loaded != 1)
2255 continue; /* no noise on spare devices */
b2d444d7 2256 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT
2257 dprintk("(skipping faulty ");
2258
2259 dprintk("%s ", bdevname(rdev->bdev,b));
b2d444d7 2260 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 2261 md_super_write(mddev,rdev,
0f420358 2262 rdev->sb_start, rdev->sb_size,
7bfa19f2
N
2263 rdev->sb_page);
2264 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2265 bdevname(rdev->bdev,b),
0f420358 2266 (unsigned long long)rdev->sb_start);
42543769 2267 rdev->sb_events = mddev->events;
7bfa19f2 2268
1da177e4
LT
2269 } else
2270 dprintk(")\n");
7bfa19f2 2271 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT
2272 /* only need to write one superblock... */
2273 break;
2274 }
a9701a30 2275 md_super_wait(mddev);
850b2b42 2276 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
7bfa19f2 2277
a9701a30 2278 spin_lock_irq(&mddev->write_lock);
850b2b42
N
2279 if (mddev->in_sync != sync_req ||
2280 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
06d91a5f 2281 /* have to write it out again */
a9701a30 2282 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N
2283 goto repeat;
2284 }
850b2b42 2285 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
a9701a30 2286 spin_unlock_irq(&mddev->write_lock);
3d310eb7 2287 wake_up(&mddev->sb_wait);
acb180b0
N
2288 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2289 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
06d91a5f 2290
1da177e4
LT
2291}
2292
7f6ce769 2293/* words written to sysfs files may, or may not, be \n terminated.
bce74dac
N
2294 * We want to accept with case. For this we use cmd_match.
2295 */
2296static int cmd_match(const char *cmd, const char *str)
2297{
2298 /* See if cmd, written into a sysfs file, matches
2299 * str. They must either be the same, or cmd can
2300 * have a trailing newline
2301 */
2302 while (*cmd && *str && *cmd == *str) {
2303 cmd++;
2304 str++;
2305 }
2306 if (*cmd == '\n')
2307 cmd++;
2308 if (*str || *cmd)
2309 return 0;
2310 return 1;
2311}
2312
86e6ffdd
N
2313struct rdev_sysfs_entry {
2314 struct attribute attr;
2315 ssize_t (*show)(mdk_rdev_t *, char *);
2316 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2317};
2318
2319static ssize_t
96de1e66 2320state_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N
2321{
2322 char *sep = "";
20a49ff6 2323 size_t len = 0;
86e6ffdd 2324
b2d444d7 2325 if (test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N
2326 len+= sprintf(page+len, "%sfaulty",sep);
2327 sep = ",";
2328 }
b2d444d7 2329 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N
2330 len += sprintf(page+len, "%sin_sync",sep);
2331 sep = ",";
2332 }
f655675b
N
2333 if (test_bit(WriteMostly, &rdev->flags)) {
2334 len += sprintf(page+len, "%swrite_mostly",sep);
2335 sep = ",";
2336 }
6bfe0b49
DW
2337 if (test_bit(Blocked, &rdev->flags)) {
2338 len += sprintf(page+len, "%sblocked", sep);
2339 sep = ",";
2340 }
b2d444d7
N
2341 if (!test_bit(Faulty, &rdev->flags) &&
2342 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N
2343 len += sprintf(page+len, "%sspare", sep);
2344 sep = ",";
2345 }
2346 return len+sprintf(page+len, "\n");
2347}
2348
45dc2de1
N
2349static ssize_t
2350state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2351{
2352 /* can write
2353 * faulty - simulates and error
2354 * remove - disconnects the device
f655675b
N
2355 * writemostly - sets write_mostly
2356 * -writemostly - clears write_mostly
6bfe0b49
DW
2357 * blocked - sets the Blocked flag
2358 * -blocked - clears the Blocked flag
6d56e278 2359 * insync - sets Insync providing device isn't active
45dc2de1
N
2360 */
2361 int err = -EINVAL;
2362 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2363 md_error(rdev->mddev, rdev);
2364 err = 0;
2365 } else if (cmd_match(buf, "remove")) {
2366 if (rdev->raid_disk >= 0)
2367 err = -EBUSY;
2368 else {
2369 mddev_t *mddev = rdev->mddev;
2370 kick_rdev_from_array(rdev);
3f9d7b0d
N
2371 if (mddev->pers)
2372 md_update_sb(mddev, 1);
45dc2de1
N
2373 md_new_event(mddev);
2374 err = 0;
2375 }
f655675b
N
2376 } else if (cmd_match(buf, "writemostly")) {
2377 set_bit(WriteMostly, &rdev->flags);
2378 err = 0;
2379 } else if (cmd_match(buf, "-writemostly")) {
2380 clear_bit(WriteMostly, &rdev->flags);
6bfe0b49
DW
2381 err = 0;
2382 } else if (cmd_match(buf, "blocked")) {
2383 set_bit(Blocked, &rdev->flags);
2384 err = 0;
2385 } else if (cmd_match(buf, "-blocked")) {
2386 clear_bit(Blocked, &rdev->flags);
2387 wake_up(&rdev->blocked_wait);
2388 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2389 md_wakeup_thread(rdev->mddev->thread);
2390
6d56e278
N
2391 err = 0;
2392 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2393 set_bit(In_sync, &rdev->flags);
f655675b 2394 err = 0;
45dc2de1 2395 }
00bcb4ac
N
2396 if (!err)
2397 sysfs_notify_dirent_safe(rdev->sysfs_state);
45dc2de1
N
2398 return err ? err : len;
2399}
80ca3a44
N
2400static struct rdev_sysfs_entry rdev_state =
2401__ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
86e6ffdd 2402
4dbcdc75
N
2403static ssize_t
2404errors_show(mdk_rdev_t *rdev, char *page)
2405{
2406 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2407}
2408
2409static ssize_t
2410errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2411{
2412 char *e;
2413 unsigned long n = simple_strtoul(buf, &e, 10);
2414 if (*buf && (*e == 0 || *e == '\n')) {
2415 atomic_set(&rdev->corrected_errors, n);
2416 return len;
2417 }
2418 return -EINVAL;
2419}
2420static struct rdev_sysfs_entry rdev_errors =
80ca3a44 2421__ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
4dbcdc75 2422
014236d2
N
2423static ssize_t
2424slot_show(mdk_rdev_t *rdev, char *page)
2425{
2426 if (rdev->raid_disk < 0)
2427 return sprintf(page, "none\n");
2428 else
2429 return sprintf(page, "%d\n", rdev->raid_disk);
2430}
2431
2432static ssize_t
2433slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2434{
2435 char *e;
c303da6d
N
2436 int err;
2437 char nm[20];
014236d2
N
2438 int slot = simple_strtoul(buf, &e, 10);
2439 if (strncmp(buf, "none", 4)==0)
2440 slot = -1;
2441 else if (e==buf || (*e && *e!= '\n'))
2442 return -EINVAL;
6c2fce2e 2443 if (rdev->mddev->pers && slot == -1) {
c303da6d
N
2444 /* Setting 'slot' on an active array requires also
2445 * updating the 'rd%d' link, and communicating
2446 * with the personality with ->hot_*_disk.
2447 * For now we only support removing
2448 * failed/spare devices. This normally happens automatically,
2449 * but not when the metadata is externally managed.
2450 */
c303da6d
N
2451 if (rdev->raid_disk == -1)
2452 return -EEXIST;
2453 /* personality does all needed checks */
2454 if (rdev->mddev->pers->hot_add_disk == NULL)
2455 return -EINVAL;
2456 err = rdev->mddev->pers->
2457 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2458 if (err)
2459 return err;
2460 sprintf(nm, "rd%d", rdev->raid_disk);
2461 sysfs_remove_link(&rdev->mddev->kobj, nm);
b7103107 2462 rdev->raid_disk = -1;
c303da6d
N
2463 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2464 md_wakeup_thread(rdev->mddev->thread);
6c2fce2e
NB
2465 } else if (rdev->mddev->pers) {
2466 mdk_rdev_t *rdev2;
6c2fce2e 2467 /* Activating a spare .. or possibly reactivating
6d56e278 2468 * if we ever get bitmaps working here.
6c2fce2e
NB
2469 */
2470
2471 if (rdev->raid_disk != -1)
2472 return -EBUSY;
2473
2474 if (rdev->mddev->pers->hot_add_disk == NULL)
2475 return -EINVAL;
2476
159ec1fc 2477 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
6c2fce2e
NB
2478 if (rdev2->raid_disk == slot)
2479 return -EEXIST;
2480
2481 rdev->raid_disk = slot;
2482 if (test_bit(In_sync, &rdev->flags))
2483 rdev->saved_raid_disk = slot;
2484 else
2485 rdev->saved_raid_disk = -1;
2486 err = rdev->mddev->pers->
2487 hot_add_disk(rdev->mddev, rdev);
199050ea 2488 if (err) {
6c2fce2e 2489 rdev->raid_disk = -1;
6c2fce2e 2490 return err;
52664732 2491 } else
00bcb4ac 2492 sysfs_notify_dirent_safe(rdev->sysfs_state);
6c2fce2e
NB
2493 sprintf(nm, "rd%d", rdev->raid_disk);
2494 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
00bcb4ac 2495 /* failure here is OK */;
6c2fce2e 2496 /* don't wakeup anyone, leave that to userspace. */
c303da6d
N
2497 } else {
2498 if (slot >= rdev->mddev->raid_disks)
2499 return -ENOSPC;
2500 rdev->raid_disk = slot;
2501 /* assume it is working */
c5d79adb
N
2502 clear_bit(Faulty, &rdev->flags);
2503 clear_bit(WriteMostly, &rdev->flags);
c303da6d 2504 set_bit(In_sync, &rdev->flags);
00bcb4ac 2505 sysfs_notify_dirent_safe(rdev->sysfs_state);
c303da6d 2506 }
014236d2
N
2507 return len;
2508}
2509
2510
2511static struct rdev_sysfs_entry rdev_slot =
80ca3a44 2512__ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
014236d2 2513
93c8cad0
N
2514static ssize_t
2515offset_show(mdk_rdev_t *rdev, char *page)
2516{
6961ece4 2517 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
93c8cad0
N
2518}
2519
2520static ssize_t
2521offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2522{
2523 char *e;
2524 unsigned long long offset = simple_strtoull(buf, &e, 10);
2525 if (e==buf || (*e && *e != '\n'))
2526 return -EINVAL;
8ed0a521 2527 if (rdev->mddev->pers && rdev->raid_disk >= 0)
93c8cad0 2528 return -EBUSY;
dd8ac336 2529 if (rdev->sectors && rdev->mddev->external)
c5d79adb
N
2530 /* Must set offset before size, so overlap checks
2531 * can be sane */
2532 return -EBUSY;
93c8cad0
N
2533 rdev->data_offset = offset;
2534 return len;
2535}
2536
2537static struct rdev_sysfs_entry rdev_offset =
80ca3a44 2538__ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
93c8cad0 2539
83303b61
N
2540static ssize_t
2541rdev_size_show(mdk_rdev_t *rdev, char *page)
2542{
dd8ac336 2543 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
83303b61
N
2544}
2545
c5d79adb
N
2546static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2547{
2548 /* check if two start/length pairs overlap */
2549 if (s1+l1 <= s2)
2550 return 0;
2551 if (s2+l2 <= s1)
2552 return 0;
2553 return 1;
2554}
2555
b522adcd
DW
2556static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2557{
2558 unsigned long long blocks;
2559 sector_t new;
2560
2561 if (strict_strtoull(buf, 10, &blocks) < 0)
2562 return -EINVAL;
2563
2564 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2565 return -EINVAL; /* sector conversion overflow */
2566
2567 new = blocks * 2;
2568 if (new != blocks * 2)
2569 return -EINVAL; /* unsigned long long to sector_t overflow */
2570
2571 *sectors = new;
2572 return 0;
2573}
2574
83303b61
N
2575static ssize_t
2576rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2577{
27c529bb 2578 mddev_t *my_mddev = rdev->mddev;
dd8ac336 2579 sector_t oldsectors = rdev->sectors;
b522adcd 2580 sector_t sectors;
27c529bb 2581
b522adcd 2582 if (strict_blocks_to_sectors(buf, &sectors) < 0)
d7027458 2583 return -EINVAL;
0cd17fec 2584 if (my_mddev->pers && rdev->raid_disk >= 0) {
d7027458 2585 if (my_mddev->persistent) {
dd8ac336
AN
2586 sectors = super_types[my_mddev->major_version].
2587 rdev_size_change(rdev, sectors);
2588 if (!sectors)
0cd17fec 2589 return -EBUSY;
dd8ac336 2590 } else if (!sectors)
77304d2a 2591 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
dd8ac336 2592 rdev->data_offset;
0cd17fec 2593 }
dd8ac336 2594 if (sectors < my_mddev->dev_sectors)
7d3c6f87 2595 return -EINVAL; /* component must fit device */
0cd17fec 2596
dd8ac336
AN
2597 rdev->sectors = sectors;
2598 if (sectors > oldsectors && my_mddev->external) {
c5d79adb
N
2599 /* need to check that all other rdevs with the same ->bdev
2600 * do not overlap. We need to unlock the mddev to avoid
dd8ac336 2601 * a deadlock. We have already changed rdev->sectors, and if
c5d79adb
N
2602 * we have to change it back, we will have the lock again.
2603 */
2604 mddev_t *mddev;
2605 int overlap = 0;
159ec1fc 2606 struct list_head *tmp;
c5d79adb 2607
27c529bb 2608 mddev_unlock(my_mddev);
29ac4aa3 2609 for_each_mddev(mddev, tmp) {
c5d79adb
N
2610 mdk_rdev_t *rdev2;
2611
2612 mddev_lock(mddev);
159ec1fc 2613 list_for_each_entry(rdev2, &mddev->disks, same_set)
c5d79adb
N
2614 if (test_bit(AllReserved, &rdev2->flags) ||
2615 (rdev->bdev == rdev2->bdev &&
2616 rdev != rdev2 &&
dd8ac336 2617 overlaps(rdev->data_offset, rdev->sectors,
d07bd3bc 2618 rdev2->data_offset,
dd8ac336 2619 rdev2->sectors))) {
c5d79adb
N
2620 overlap = 1;
2621 break;
2622 }
2623 mddev_unlock(mddev);
2624 if (overlap) {
2625 mddev_put(mddev);
2626 break;
2627 }
2628 }
27c529bb 2629 mddev_lock(my_mddev);
c5d79adb
N
2630 if (overlap) {
2631 /* Someone else could have slipped in a size
2632 * change here, but doing so is just silly.
dd8ac336 2633 * We put oldsectors back because we *know* it is
c5d79adb
N
2634 * safe, and trust userspace not to race with
2635 * itself
2636 */
dd8ac336 2637 rdev->sectors = oldsectors;
c5d79adb
N
2638 return -EBUSY;
2639 }
2640 }
83303b61
N
2641 return len;
2642}
2643
2644static struct rdev_sysfs_entry rdev_size =
80ca3a44 2645__ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
83303b61 2646
06e3c817
DW
2647
2648static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page)
2649{
2650 unsigned long long recovery_start = rdev->recovery_offset;
2651
2652 if (test_bit(In_sync, &rdev->flags) ||
2653 recovery_start == MaxSector)
2654 return sprintf(page, "none\n");
2655
2656 return sprintf(page, "%llu\n", recovery_start);
2657}
2658
2659static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2660{
2661 unsigned long long recovery_start;
2662
2663 if (cmd_match(buf, "none"))
2664 recovery_start = MaxSector;
2665 else if (strict_strtoull(buf, 10, &recovery_start))
2666 return -EINVAL;
2667
2668 if (rdev->mddev->pers &&
2669 rdev->raid_disk >= 0)
2670 return -EBUSY;
2671
2672 rdev->recovery_offset = recovery_start;
2673 if (recovery_start == MaxSector)
2674 set_bit(In_sync, &rdev->flags);
2675 else
2676 clear_bit(In_sync, &rdev->flags);
2677 return len;
2678}
2679
2680static struct rdev_sysfs_entry rdev_recovery_start =
2681__ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
2682
86e6ffdd
N
2683static struct attribute *rdev_default_attrs[] = {
2684 &rdev_state.attr,
4dbcdc75 2685 &rdev_errors.attr,
014236d2 2686 &rdev_slot.attr,
93c8cad0 2687 &rdev_offset.attr,
83303b61 2688 &rdev_size.attr,
06e3c817 2689 &rdev_recovery_start.attr,
86e6ffdd
N
2690 NULL,
2691};
2692static ssize_t
2693rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2694{
2695 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2696 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
27c529bb
N
2697 mddev_t *mddev = rdev->mddev;
2698 ssize_t rv;
86e6ffdd
N
2699
2700 if (!entry->show)
2701 return -EIO;
27c529bb
N
2702
2703 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2704 if (!rv) {
2705 if (rdev->mddev == NULL)
2706 rv = -EBUSY;
2707 else
2708 rv = entry->show(rdev, page);
2709 mddev_unlock(mddev);
2710 }
2711 return rv;
86e6ffdd
N
2712}
2713
2714static ssize_t
2715rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2716 const char *page, size_t length)
2717{
2718 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2719 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
27c529bb
N
2720 ssize_t rv;
2721 mddev_t *mddev = rdev->mddev;
86e6ffdd
N
2722
2723 if (!entry->store)
2724 return -EIO;
67463acb
N
2725 if (!capable(CAP_SYS_ADMIN))
2726 return -EACCES;
27c529bb 2727 rv = mddev ? mddev_lock(mddev): -EBUSY;
ca388059 2728 if (!rv) {
27c529bb
N
2729 if (rdev->mddev == NULL)
2730 rv = -EBUSY;
2731 else
2732 rv = entry->store(rdev, page, length);
6a51830e 2733 mddev_unlock(mddev);
ca388059
N
2734 }
2735 return rv;
86e6ffdd
N
2736}
2737
2738static void rdev_free(struct kobject *ko)
2739{
2740 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2741 kfree(rdev);
2742}
52cf25d0 2743static const struct sysfs_ops rdev_sysfs_ops = {
86e6ffdd
N
2744 .show = rdev_attr_show,
2745 .store = rdev_attr_store,
2746};
2747static struct kobj_type rdev_ktype = {
2748 .release = rdev_free,
2749 .sysfs_ops = &rdev_sysfs_ops,
2750 .default_attrs = rdev_default_attrs,
2751};
2752
e8bb9a83
N
2753void md_rdev_init(mdk_rdev_t *rdev)
2754{
2755 rdev->desc_nr = -1;
2756 rdev->saved_raid_disk = -1;
2757 rdev->raid_disk = -1;
2758 rdev->flags = 0;
2759 rdev->data_offset = 0;
2760 rdev->sb_events = 0;
2761 rdev->last_read_error.tv_sec = 0;
2762 rdev->last_read_error.tv_nsec = 0;
2763 atomic_set(&rdev->nr_pending, 0);
2764 atomic_set(&rdev->read_errors, 0);
2765 atomic_set(&rdev->corrected_errors, 0);
2766
2767 INIT_LIST_HEAD(&rdev->same_set);
2768 init_waitqueue_head(&rdev->blocked_wait);
2769}
2770EXPORT_SYMBOL_GPL(md_rdev_init);
1da177e4
LT
2771/*
2772 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2773 *
2774 * mark the device faulty if:
2775 *
2776 * - the device is nonexistent (zero size)
2777 * - the device has no valid superblock
2778 *
2779 * a faulty rdev _never_ has rdev->sb set.
2780 */
2781static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2782{
2783 char b[BDEVNAME_SIZE];
2784 int err;
2785 mdk_rdev_t *rdev;
2786 sector_t size;
2787
9ffae0cf 2788 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1da177e4
LT
2789 if (!rdev) {
2790 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2791 return ERR_PTR(-ENOMEM);
2792 }
1da177e4 2793
e8bb9a83 2794 md_rdev_init(rdev);
1da177e4
LT
2795 if ((err = alloc_disk_sb(rdev)))
2796 goto abort_free;
2797
c5d79adb 2798 err = lock_rdev(rdev, newdev, super_format == -2);
1da177e4
LT
2799 if (err)
2800 goto abort_free;
2801
f9cb074b 2802 kobject_init(&rdev->kobj, &rdev_ktype);
86e6ffdd 2803
77304d2a 2804 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
1da177e4
LT
2805 if (!size) {
2806 printk(KERN_WARNING
2807 "md: %s has zero or unknown size, marking faulty!\n",
2808 bdevname(rdev->bdev,b));
2809 err = -EINVAL;
2810 goto abort_free;
2811 }
2812
2813 if (super_format >= 0) {
2814 err = super_types[super_format].
2815 load_super(rdev, NULL, super_minor);
2816 if (err == -EINVAL) {
df968c4e
N
2817 printk(KERN_WARNING
2818 "md: %s does not have a valid v%d.%d "
2819 "superblock, not importing!\n",
2820 bdevname(rdev->bdev,b),
2821 super_format, super_minor);
1da177e4
LT
2822 goto abort_free;
2823 }
2824 if (err < 0) {
2825 printk(KERN_WARNING
2826 "md: could not read %s's sb, not importing!\n",
2827 bdevname(rdev->bdev,b));
2828 goto abort_free;
2829 }
2830 }
6bfe0b49 2831
1da177e4
LT
2832 return rdev;
2833
2834abort_free:
2835 if (rdev->sb_page) {
2836 if (rdev->bdev)
2837 unlock_rdev(rdev);
2838 free_disk_sb(rdev);
2839 }
2840 kfree(rdev);
2841 return ERR_PTR(err);
2842}
2843
2844/*
2845 * Check a full RAID array for plausibility
2846 */
2847
2848
a757e64c 2849static void analyze_sbs(mddev_t * mddev)
1da177e4
LT
2850{
2851 int i;
159ec1fc 2852 mdk_rdev_t *rdev, *freshest, *tmp;
1da177e4
LT
2853 char b[BDEVNAME_SIZE];
2854
2855 freshest = NULL;
d089c6af 2856 rdev_for_each(rdev, tmp, mddev)
1da177e4
LT
2857 switch (super_types[mddev->major_version].
2858 load_super(rdev, freshest, mddev->minor_version)) {
2859 case 1:
2860 freshest = rdev;
2861 break;
2862 case 0:
2863 break;
2864 default:
2865 printk( KERN_ERR \
2866 "md: fatal superblock inconsistency in %s"
2867 " -- removing from array\n",
2868 bdevname(rdev->bdev,b));
2869 kick_rdev_from_array(rdev);
2870 }
2871
2872
2873 super_types[mddev->major_version].
2874 validate_super(mddev, freshest);
2875
2876 i = 0;
d089c6af 2877 rdev_for_each(rdev, tmp, mddev) {
233fca36
N
2878 if (mddev->max_disks &&
2879 (rdev->desc_nr >= mddev->max_disks ||
2880 i > mddev->max_disks)) {
de01dfad
N
2881 printk(KERN_WARNING
2882 "md: %s: %s: only %d devices permitted\n",
2883 mdname(mddev), bdevname(rdev->bdev, b),
2884 mddev->max_disks);
2885 kick_rdev_from_array(rdev);
2886 continue;
2887 }
1da177e4
LT
2888 if (rdev != freshest)
2889 if (super_types[mddev->major_version].
2890 validate_super(mddev, rdev)) {
2891 printk(KERN_WARNING "md: kicking non-fresh %s"
2892 " from array!\n",
2893 bdevname(rdev->bdev,b));
2894 kick_rdev_from_array(rdev);
2895 continue;
2896 }
2897 if (mddev->level == LEVEL_MULTIPATH) {
2898 rdev->desc_nr = i++;
2899 rdev->raid_disk = rdev->desc_nr;
b2d444d7 2900 set_bit(In_sync, &rdev->flags);
5e5e3e78 2901 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
a778b73f
N
2902 rdev->raid_disk = -1;
2903 clear_bit(In_sync, &rdev->flags);
1da177e4
LT
2904 }
2905 }
1da177e4
LT
2906}
2907
72e02075
N
2908/* Read a fixed-point number.
2909 * Numbers in sysfs attributes should be in "standard" units where
2910 * possible, so time should be in seconds.
2911 * However we internally use a a much smaller unit such as
2912 * milliseconds or jiffies.
2913 * This function takes a decimal number with a possible fractional
2914 * component, and produces an integer which is the result of
2915 * multiplying that number by 10^'scale'.
2916 * all without any floating-point arithmetic.
2917 */
2918int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
2919{
2920 unsigned long result = 0;
2921 long decimals = -1;
2922 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
2923 if (*cp == '.')
2924 decimals = 0;
2925 else if (decimals < scale) {
2926 unsigned int value;
2927 value = *cp - '0';
2928 result = result * 10 + value;
2929 if (decimals >= 0)
2930 decimals++;
2931 }
2932 cp++;
2933 }
2934 if (*cp == '\n')
2935 cp++;
2936 if (*cp)
2937 return -EINVAL;
2938 if (decimals < 0)
2939 decimals = 0;
2940 while (decimals < scale) {
2941 result *= 10;
2942 decimals ++;
2943 }
2944 *res = result;
2945 return 0;
2946}
2947
2948
19052c0e
N
2949static void md_safemode_timeout(unsigned long data);
2950
16f17b39
N
2951static ssize_t
2952safe_delay_show(mddev_t *mddev, char *page)
2953{
2954 int msec = (mddev->safemode_delay*1000)/HZ;
2955 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2956}
2957static ssize_t
2958safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2959{
16f17b39 2960 unsigned long msec;
97ce0a7f 2961
72e02075 2962 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
16f17b39 2963 return -EINVAL;
16f17b39
N
2964 if (msec == 0)
2965 mddev->safemode_delay = 0;
2966 else {
19052c0e 2967 unsigned long old_delay = mddev->safemode_delay;
16f17b39
N
2968 mddev->safemode_delay = (msec*HZ)/1000;
2969 if (mddev->safemode_delay == 0)
2970 mddev->safemode_delay = 1;
19052c0e
N
2971 if (mddev->safemode_delay < old_delay)
2972 md_safemode_timeout((unsigned long)mddev);
16f17b39
N
2973 }
2974 return len;
2975}
2976static struct md_sysfs_entry md_safe_delay =
80ca3a44 2977__ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
16f17b39 2978
eae1701f 2979static ssize_t
96de1e66 2980level_show(mddev_t *mddev, char *page)
eae1701f 2981{
2604b703 2982 struct mdk_personality *p = mddev->pers;
d9d166c2 2983 if (p)
eae1701f 2984 return sprintf(page, "%s\n", p->name);
d9d166c2
N
2985 else if (mddev->clevel[0])
2986 return sprintf(page, "%s\n", mddev->clevel);
2987 else if (mddev->level != LEVEL_NONE)
2988 return sprintf(page, "%d\n", mddev->level);
2989 else
2990 return 0;
eae1701f
N
2991}
2992
d9d166c2
N
2993static ssize_t
2994level_store(mddev_t *mddev, const char *buf, size_t len)
2995{
f2859af6 2996 char clevel[16];
20a49ff6 2997 ssize_t rv = len;
245f46c2 2998 struct mdk_personality *pers;
f2859af6 2999 long level;
245f46c2 3000 void *priv;
3a981b03 3001 mdk_rdev_t *rdev;
245f46c2
N
3002
3003 if (mddev->pers == NULL) {
3004 if (len == 0)
3005 return 0;
3006 if (len >= sizeof(mddev->clevel))
3007 return -ENOSPC;
3008 strncpy(mddev->clevel, buf, len);
3009 if (mddev->clevel[len-1] == '\n')
3010 len--;
3011 mddev->clevel[len] = 0;
3012 mddev->level = LEVEL_NONE;
3013 return rv;
3014 }
3015
3016 /* request to change the personality. Need to ensure:
3017 * - array is not engaged in resync/recovery/reshape
3018 * - old personality can be suspended
3019 * - new personality will access other array.
3020 */
3021
bb4f1e9d
N
3022 if (mddev->sync_thread ||
3023 mddev->reshape_position != MaxSector ||
3024 mddev->sysfs_active)
d9d166c2 3025 return -EBUSY;
245f46c2
N
3026
3027 if (!mddev->pers->quiesce) {
3028 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3029 mdname(mddev), mddev->pers->name);
3030 return -EINVAL;
3031 }
3032
3033 /* Now find the new personality */
f2859af6 3034 if (len == 0 || len >= sizeof(clevel))
245f46c2 3035 return -EINVAL;
f2859af6
DW
3036 strncpy(clevel, buf, len);
3037 if (clevel[len-1] == '\n')
d9d166c2 3038 len--;
f2859af6
DW
3039 clevel[len] = 0;
3040 if (strict_strtol(clevel, 10, &level))
3041 level = LEVEL_NONE;
245f46c2 3042
f2859af6
DW
3043 if (request_module("md-%s", clevel) != 0)
3044 request_module("md-level-%s", clevel);
245f46c2 3045 spin_lock(&pers_lock);
f2859af6 3046 pers = find_pers(level, clevel);
245f46c2
N
3047 if (!pers || !try_module_get(pers->owner)) {
3048 spin_unlock(&pers_lock);
f2859af6 3049 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
245f46c2
N
3050 return -EINVAL;
3051 }
3052 spin_unlock(&pers_lock);
3053
3054 if (pers == mddev->pers) {
3055 /* Nothing to do! */
3056 module_put(pers->owner);
3057 return rv;
3058 }
3059 if (!pers->takeover) {
3060 module_put(pers->owner);
3061 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
f2859af6 3062 mdname(mddev), clevel);
245f46c2
N
3063 return -EINVAL;
3064 }
3065
e93f68a1
N
3066 list_for_each_entry(rdev, &mddev->disks, same_set)
3067 rdev->new_raid_disk = rdev->raid_disk;
3068
245f46c2
N
3069 /* ->takeover must set new_* and/or delta_disks
3070 * if it succeeds, and may set them when it fails.
3071 */
3072 priv = pers->takeover(mddev);
3073 if (IS_ERR(priv)) {
3074 mddev->new_level = mddev->level;
3075 mddev->new_layout = mddev->layout;
664e7c41 3076 mddev->new_chunk_sectors = mddev->chunk_sectors;
245f46c2
N
3077 mddev->raid_disks -= mddev->delta_disks;
3078 mddev->delta_disks = 0;
3079 module_put(pers->owner);
3080 printk(KERN_WARNING "md: %s: %s would not accept array\n",
f2859af6 3081 mdname(mddev), clevel);
245f46c2
N
3082 return PTR_ERR(priv);
3083 }
3084
3085 /* Looks like we have a winner */
3086 mddev_suspend(mddev);
3087 mddev->pers->stop(mddev);
a64c876f
N
3088
3089 if (mddev->pers->sync_request == NULL &&
3090 pers->sync_request != NULL) {
3091 /* need to add the md_redundancy_group */
3092 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3093 printk(KERN_WARNING
3094 "md: cannot register extra attributes for %s\n",
3095 mdname(mddev));
19fdb9ee 3096 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action");
a64c876f
N
3097 }
3098 if (mddev->pers->sync_request != NULL &&
3099 pers->sync_request == NULL) {
3100 /* need to remove the md_redundancy_group */
3101 if (mddev->to_remove == NULL)
3102 mddev->to_remove = &md_redundancy_group;
3103 }
3104
54071b38
TM
3105 if (mddev->pers->sync_request == NULL &&
3106 mddev->external) {
3107 /* We are converting from a no-redundancy array
3108 * to a redundancy array and metadata is managed
3109 * externally so we need to be sure that writes
3110 * won't block due to a need to transition
3111 * clean->dirty
3112 * until external management is started.
3113 */
3114 mddev->in_sync = 0;
3115 mddev->safemode_delay = 0;
3116 mddev->safemode = 0;
3117 }
3118
e93f68a1
N
3119 list_for_each_entry(rdev, &mddev->disks, same_set) {
3120 char nm[20];
3121 if (rdev->raid_disk < 0)
3122 continue;
3123 if (rdev->new_raid_disk > mddev->raid_disks)
3124 rdev->new_raid_disk = -1;
3125 if (rdev->new_raid_disk == rdev->raid_disk)
3126 continue;
3127 sprintf(nm, "rd%d", rdev->raid_disk);
3128 sysfs_remove_link(&mddev->kobj, nm);
3129 }
3130 list_for_each_entry(rdev, &mddev->disks, same_set) {
3131 if (rdev->raid_disk < 0)
3132 continue;
3133 if (rdev->new_raid_disk == rdev->raid_disk)
3134 continue;
3135 rdev->raid_disk = rdev->new_raid_disk;
3136 if (rdev->raid_disk < 0)
3a981b03 3137 clear_bit(In_sync, &rdev->flags);
e93f68a1
N
3138 else {
3139 char nm[20];
3140 sprintf(nm, "rd%d", rdev->raid_disk);
3141 if(sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3142 printk("md: cannot register %s for %s after level change\n",
3143 nm, mdname(mddev));
3a981b03 3144 }
e93f68a1
N
3145 }
3146
3147 module_put(mddev->pers->owner);
245f46c2
N
3148 mddev->pers = pers;
3149 mddev->private = priv;
3150 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3151 mddev->level = mddev->new_level;
3152 mddev->layout = mddev->new_layout;
664e7c41 3153 mddev->chunk_sectors = mddev->new_chunk_sectors;
245f46c2 3154 mddev->delta_disks = 0;
9af204cf
TM
3155 if (mddev->pers->sync_request == NULL) {
3156 /* this is now an array without redundancy, so
3157 * it must always be in_sync
3158 */
3159 mddev->in_sync = 1;
3160 del_timer_sync(&mddev->safemode_timer);
3161 }
245f46c2
N
3162 pers->run(mddev);
3163 mddev_resume(mddev);
3164 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3165 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3166 md_wakeup_thread(mddev->thread);
5cac7861 3167 sysfs_notify(&mddev->kobj, NULL, "level");
bb7f8d22 3168 md_new_event(mddev);
d9d166c2
N
3169 return rv;
3170}
3171
3172static struct md_sysfs_entry md_level =
80ca3a44 3173__ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
eae1701f 3174
d4dbd025
N
3175
3176static ssize_t
3177layout_show(mddev_t *mddev, char *page)
3178{
3179 /* just a number, not meaningful for all levels */
08a02ecd
N
3180 if (mddev->reshape_position != MaxSector &&
3181 mddev->layout != mddev->new_layout)
3182 return sprintf(page, "%d (%d)\n",
3183 mddev->new_layout, mddev->layout);
d4dbd025
N
3184 return sprintf(page, "%d\n", mddev->layout);
3185}
3186
3187static ssize_t
3188layout_store(mddev_t *mddev, const char *buf, size_t len)
3189{
3190 char *e;
3191 unsigned long n = simple_strtoul(buf, &e, 10);
d4dbd025
N
3192
3193 if (!*buf || (*e && *e != '\n'))
3194 return -EINVAL;
3195
b3546035
N
3196 if (mddev->pers) {
3197 int err;
50ac168a 3198 if (mddev->pers->check_reshape == NULL)
b3546035 3199 return -EBUSY;
597a711b 3200 mddev->new_layout = n;
50ac168a 3201 err = mddev->pers->check_reshape(mddev);
597a711b
N
3202 if (err) {
3203 mddev->new_layout = mddev->layout;
b3546035 3204 return err;
597a711b 3205 }
b3546035 3206 } else {
08a02ecd 3207 mddev->new_layout = n;
b3546035
N
3208 if (mddev->reshape_position == MaxSector)
3209 mddev->layout = n;
3210 }
d4dbd025
N
3211 return len;
3212}
3213static struct md_sysfs_entry md_layout =
80ca3a44 3214__ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
d4dbd025
N
3215
3216
eae1701f 3217static ssize_t
96de1e66 3218raid_disks_show(mddev_t *mddev, char *page)
eae1701f 3219{
bb636547
N
3220 if (mddev->raid_disks == 0)
3221 return 0;
08a02ecd
N
3222 if (mddev->reshape_position != MaxSector &&
3223 mddev->delta_disks != 0)
3224 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3225 mddev->raid_disks - mddev->delta_disks);
eae1701f
N
3226 return sprintf(page, "%d\n", mddev->raid_disks);
3227}
3228
da943b99
N
3229static int update_raid_disks(mddev_t *mddev, int raid_disks);
3230
3231static ssize_t
3232raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
3233{
da943b99
N
3234 char *e;
3235 int rv = 0;
3236 unsigned long n = simple_strtoul(buf, &e, 10);
3237
3238 if (!*buf || (*e && *e != '\n'))
3239 return -EINVAL;
3240
3241 if (mddev->pers)
3242 rv = update_raid_disks(mddev, n);
08a02ecd
N
3243 else if (mddev->reshape_position != MaxSector) {
3244 int olddisks = mddev->raid_disks - mddev->delta_disks;
3245 mddev->delta_disks = n - olddisks;
3246 mddev->raid_disks = n;
3247 } else
da943b99
N
3248 mddev->raid_disks = n;
3249 return rv ? rv : len;
3250}
3251static struct md_sysfs_entry md_raid_disks =
80ca3a44 3252__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
eae1701f 3253
3b34380a
N
3254static ssize_t
3255chunk_size_show(mddev_t *mddev, char *page)
3256{
08a02ecd 3257 if (mddev->reshape_position != MaxSector &&
664e7c41
AN
3258 mddev->chunk_sectors != mddev->new_chunk_sectors)
3259 return sprintf(page, "%d (%d)\n",
3260 mddev->new_chunk_sectors << 9,
9d8f0363
AN
3261 mddev->chunk_sectors << 9);
3262 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3b34380a
N
3263}
3264
3265static ssize_t
3266chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
3267{
3b34380a
N
3268 char *e;
3269 unsigned long n = simple_strtoul(buf, &e, 10);
3270
3b34380a
N
3271 if (!*buf || (*e && *e != '\n'))
3272 return -EINVAL;
3273
b3546035
N
3274 if (mddev->pers) {
3275 int err;
50ac168a 3276 if (mddev->pers->check_reshape == NULL)
b3546035 3277 return -EBUSY;
597a711b 3278 mddev->new_chunk_sectors = n >> 9;
50ac168a 3279 err = mddev->pers->check_reshape(mddev);
597a711b
N
3280 if (err) {
3281 mddev->new_chunk_sectors = mddev->chunk_sectors;
b3546035 3282 return err;
597a711b 3283 }
b3546035 3284 } else {
664e7c41 3285 mddev->new_chunk_sectors = n >> 9;
b3546035 3286 if (mddev->reshape_position == MaxSector)
9d8f0363 3287 mddev->chunk_sectors = n >> 9;
b3546035 3288 }
3b34380a
N
3289 return len;
3290}
3291static struct md_sysfs_entry md_chunk_size =
80ca3a44 3292__ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3b34380a 3293
a94213b1
N
3294static ssize_t
3295resync_start_show(mddev_t *mddev, char *page)
3296{
d1a7c503
N
3297 if (mddev->recovery_cp == MaxSector)
3298 return sprintf(page, "none\n");
a94213b1
N
3299 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3300}
3301
3302static ssize_t
3303resync_start_store(mddev_t *mddev, const char *buf, size_t len)
3304{
a94213b1
N
3305 char *e;
3306 unsigned long long n = simple_strtoull(buf, &e, 10);
3307
3308 if (mddev->pers)
3309 return -EBUSY;
06e3c817
DW
3310 if (cmd_match(buf, "none"))
3311 n = MaxSector;
3312 else if (!*buf || (*e && *e != '\n'))
a94213b1
N
3313 return -EINVAL;
3314
3315 mddev->recovery_cp = n;
3316 return len;
3317}
3318static struct md_sysfs_entry md_resync_start =
80ca3a44 3319__ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
a94213b1 3320
9e653b63
N
3321/*
3322 * The array state can be:
3323 *
3324 * clear
3325 * No devices, no size, no level
3326 * Equivalent to STOP_ARRAY ioctl
3327 * inactive
3328 * May have some settings, but array is not active
3329 * all IO results in error
3330 * When written, doesn't tear down array, but just stops it
3331 * suspended (not supported yet)
3332 * All IO requests will block. The array can be reconfigured.
910d8cb3 3333 * Writing this, if accepted, will block until array is quiescent
9e653b63
N
3334 * readonly
3335 * no resync can happen. no superblocks get written.
3336 * write requests fail
3337 * read-auto
3338 * like readonly, but behaves like 'clean' on a write request.
3339 *
3340 * clean - no pending writes, but otherwise active.
3341 * When written to inactive array, starts without resync
3342 * If a write request arrives then
3343 * if metadata is known, mark 'dirty' and switch to 'active'.
3344 * if not known, block and switch to write-pending
3345 * If written to an active array that has pending writes, then fails.
3346 * active
3347 * fully active: IO and resync can be happening.
3348 * When written to inactive array, starts with resync
3349 *
3350 * write-pending
3351 * clean, but writes are blocked waiting for 'active' to be written.
3352 *
3353 * active-idle
3354 * like active, but no writes have been seen for a while (100msec).
3355 *
3356 */
3357enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3358 write_pending, active_idle, bad_word};
05381954 3359static char *array_states[] = {
9e653b63
N
3360 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3361 "write-pending", "active-idle", NULL };
3362
3363static int match_word(const char *word, char **list)
3364{
3365 int n;
3366 for (n=0; list[n]; n++)
3367 if (cmd_match(word, list[n]))
3368 break;
3369 return n;
3370}
3371
3372static ssize_t
3373array_state_show(mddev_t *mddev, char *page)
3374{
3375 enum array_state st = inactive;
3376
3377 if (mddev->pers)
3378 switch(mddev->ro) {
3379 case 1:
3380 st = readonly;
3381 break;
3382 case 2:
3383 st = read_auto;
3384 break;
3385 case 0:
3386 if (mddev->in_sync)
3387 st = clean;
070dc6dd 3388 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
e691063a 3389 st = write_pending;
9e653b63
N
3390 else if (mddev->safemode)
3391 st = active_idle;
3392 else
3393 st = active;
3394 }
3395 else {
3396 if (list_empty(&mddev->disks) &&
3397 mddev->raid_disks == 0 &&
58c0fed4 3398 mddev->dev_sectors == 0)
9e653b63
N
3399 st = clear;
3400 else
3401 st = inactive;
3402 }
3403 return sprintf(page, "%s\n", array_states[st]);
3404}
3405
df5b20cf 3406static int do_md_stop(mddev_t * mddev, int ro, int is_open);
a4bd82d0 3407static int md_set_readonly(mddev_t * mddev, int is_open);
9e653b63
N
3408static int do_md_run(mddev_t * mddev);
3409static int restart_array(mddev_t *mddev);
3410
3411static ssize_t
3412array_state_store(mddev_t *mddev, const char *buf, size_t len)
3413{
3414 int err = -EINVAL;
3415 enum array_state st = match_word(buf, array_states);
3416 switch(st) {
3417 case bad_word:
3418 break;
3419 case clear:
3420 /* stopping an active array */
f2ea68cf 3421 if (atomic_read(&mddev->openers) > 0)
e691063a 3422 return -EBUSY;
df5b20cf 3423 err = do_md_stop(mddev, 0, 0);
9e653b63
N
3424 break;
3425 case inactive:
3426 /* stopping an active array */
3427 if (mddev->pers) {
f2ea68cf 3428 if (atomic_read(&mddev->openers) > 0)
9e653b63 3429 return -EBUSY;
df5b20cf 3430 err = do_md_stop(mddev, 2, 0);
e691063a
N
3431 } else
3432 err = 0; /* already inactive */
9e653b63
N
3433 break;
3434 case suspended:
3435 break; /* not supported yet */
3436 case readonly:
3437 if (mddev->pers)
a4bd82d0 3438 err = md_set_readonly(mddev, 0);
9e653b63
N
3439 else {
3440 mddev->ro = 1;
648b629e 3441 set_disk_ro(mddev->gendisk, 1);
9e653b63
N
3442 err = do_md_run(mddev);
3443 }
3444 break;
3445 case read_auto:
9e653b63 3446 if (mddev->pers) {
80268ee9 3447 if (mddev->ro == 0)
a4bd82d0 3448 err = md_set_readonly(mddev, 0);
80268ee9 3449 else if (mddev->ro == 1)
648b629e
N
3450 err = restart_array(mddev);
3451 if (err == 0) {
3452 mddev->ro = 2;
3453 set_disk_ro(mddev->gendisk, 0);
3454 }
9e653b63
N
3455 } else {
3456 mddev->ro = 2;
3457 err = do_md_run(mddev);
3458 }
3459 break;
3460 case clean:
3461 if (mddev->pers) {
3462 restart_array(mddev);
3463 spin_lock_irq(&mddev->write_lock);
3464 if (atomic_read(&mddev->writes_pending) == 0) {
e691063a
N
3465 if (mddev->in_sync == 0) {
3466 mddev->in_sync = 1;
31a59e34
N
3467 if (mddev->safemode == 1)
3468 mddev->safemode = 0;
070dc6dd 3469 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
e691063a
N
3470 }
3471 err = 0;
3472 } else
3473 err = -EBUSY;
9e653b63 3474 spin_unlock_irq(&mddev->write_lock);
5bf29597
N
3475 } else
3476 err = -EINVAL;
9e653b63
N
3477 break;
3478 case active:
3479 if (mddev->pers) {
3480 restart_array(mddev);
070dc6dd 3481 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
9e653b63
N
3482 wake_up(&mddev->sb_wait);
3483 err = 0;
3484 } else {
3485 mddev->ro = 0;
648b629e 3486 set_disk_ro(mddev->gendisk, 0);
9e653b63
N
3487 err = do_md_run(mddev);
3488 }
3489 break;
3490 case write_pending:
3491 case active_idle:
3492 /* these cannot be set */
3493 break;
3494 }
3495 if (err)
3496 return err;
0fd62b86 3497 else {
00bcb4ac 3498 sysfs_notify_dirent_safe(mddev->sysfs_state);
9e653b63 3499 return len;
0fd62b86 3500 }
9e653b63 3501}
80ca3a44
N
3502static struct md_sysfs_entry md_array_state =
3503__ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
9e653b63 3504
1e50915f
RB
3505static ssize_t
3506max_corrected_read_errors_show(mddev_t *mddev, char *page) {
3507 return sprintf(page, "%d\n",
3508 atomic_read(&mddev->max_corr_read_errors));
3509}
3510
3511static ssize_t
3512max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len)
3513{
3514 char *e;
3515 unsigned long n = simple_strtoul(buf, &e, 10);
3516
3517 if (*buf && (*e == 0 || *e == '\n')) {
3518 atomic_set(&mddev->max_corr_read_errors, n);
3519 return len;
3520 }
3521 return -EINVAL;
3522}
3523
3524static struct md_sysfs_entry max_corr_read_errors =
3525__ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3526 max_corrected_read_errors_store);
3527
6d7ff738
N
3528static ssize_t
3529null_show(mddev_t *mddev, char *page)
3530{
3531 return -EINVAL;
3532}
3533
3534static ssize_t
3535new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3536{
3537 /* buf must be %d:%d\n? giving major and minor numbers */
3538 /* The new device is added to the array.
3539 * If the array has a persistent superblock, we read the
3540 * superblock to initialise info and check validity.
3541 * Otherwise, only checking done is that in bind_rdev_to_array,
3542 * which mainly checks size.
3543 */
3544 char *e;
3545 int major = simple_strtoul(buf, &e, 10);
3546 int minor;
3547 dev_t dev;
3548 mdk_rdev_t *rdev;
3549 int err;
3550
3551 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3552 return -EINVAL;
3553 minor = simple_strtoul(e+1, &e, 10);
3554 if (*e && *e != '\n')
3555 return -EINVAL;
3556 dev = MKDEV(major, minor);
3557 if (major != MAJOR(dev) ||
3558 minor != MINOR(dev))
3559 return -EOVERFLOW;
3560
3561
3562 if (mddev->persistent) {
3563 rdev = md_import_device(dev, mddev->major_version,
3564 mddev->minor_version);
3565 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3566 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3567 mdk_rdev_t, same_set);
3568 err = super_types[mddev->major_version]
3569 .load_super(rdev, rdev0, mddev->minor_version);
3570 if (err < 0)
3571 goto out;
3572 }
c5d79adb
N
3573 } else if (mddev->external)
3574 rdev = md_import_device(dev, -2, -1);
3575 else
6d7ff738
N
3576 rdev = md_import_device(dev, -1, -1);
3577
3578 if (IS_ERR(rdev))
3579 return PTR_ERR(rdev);
3580 err = bind_rdev_to_array(rdev, mddev);
3581 out:
3582 if (err)
3583 export_rdev(rdev);
3584 return err ? err : len;
3585}
3586
3587static struct md_sysfs_entry md_new_device =
80ca3a44 3588__ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3b34380a 3589
9b1d1dac
PC
3590static ssize_t
3591bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3592{
3593 char *end;
3594 unsigned long chunk, end_chunk;
3595
3596 if (!mddev->bitmap)
3597 goto out;
3598 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3599 while (*buf) {
3600 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3601 if (buf == end) break;
3602 if (*end == '-') { /* range */
3603 buf = end + 1;
3604 end_chunk = simple_strtoul(buf, &end, 0);
3605 if (buf == end) break;
3606 }
3607 if (*end && !isspace(*end)) break;
3608 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
e7d2860b 3609 buf = skip_spaces(end);
9b1d1dac
PC
3610 }
3611 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3612out:
3613 return len;
3614}
3615
3616static struct md_sysfs_entry md_bitmap =
3617__ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3618
a35b0d69
N
3619static ssize_t
3620size_show(mddev_t *mddev, char *page)
3621{
58c0fed4
AN
3622 return sprintf(page, "%llu\n",
3623 (unsigned long long)mddev->dev_sectors / 2);
a35b0d69
N
3624}
3625
d71f9f88 3626static int update_size(mddev_t *mddev, sector_t num_sectors);
a35b0d69
N
3627
3628static ssize_t
3629size_store(mddev_t *mddev, const char *buf, size_t len)
3630{
3631 /* If array is inactive, we can reduce the component size, but
3632 * not increase it (except from 0).
3633 * If array is active, we can try an on-line resize
3634 */
b522adcd
DW
3635 sector_t sectors;
3636 int err = strict_blocks_to_sectors(buf, &sectors);
a35b0d69 3637
58c0fed4
AN
3638 if (err < 0)
3639 return err;
a35b0d69 3640 if (mddev->pers) {
58c0fed4 3641 err = update_size(mddev, sectors);
850b2b42 3642 md_update_sb(mddev, 1);
a35b0d69 3643 } else {
58c0fed4
AN
3644 if (mddev->dev_sectors == 0 ||
3645 mddev->dev_sectors > sectors)
3646 mddev->dev_sectors = sectors;
a35b0d69
N
3647 else
3648 err = -ENOSPC;
3649 }
3650 return err ? err : len;
3651}
3652
3653static struct md_sysfs_entry md_size =
80ca3a44 3654__ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
a35b0d69 3655
8bb93aac
N
3656
3657/* Metdata version.
e691063a
N
3658 * This is one of
3659 * 'none' for arrays with no metadata (good luck...)
3660 * 'external' for arrays with externally managed metadata,
8bb93aac
N
3661 * or N.M for internally known formats
3662 */
3663static ssize_t
3664metadata_show(mddev_t *mddev, char *page)
3665{
3666 if (mddev->persistent)
3667 return sprintf(page, "%d.%d\n",
3668 mddev->major_version, mddev->minor_version);
e691063a
N
3669 else if (mddev->external)
3670 return sprintf(page, "external:%s\n", mddev->metadata_type);
8bb93aac
N
3671 else
3672 return sprintf(page, "none\n");
3673}
3674
3675static ssize_t
3676metadata_store(mddev_t *mddev, const char *buf, size_t len)
3677{
3678 int major, minor;
3679 char *e;
ea43ddd8
N
3680 /* Changing the details of 'external' metadata is
3681 * always permitted. Otherwise there must be
3682 * no devices attached to the array.
3683 */
3684 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3685 ;
3686 else if (!list_empty(&mddev->disks))
8bb93aac
N
3687 return -EBUSY;
3688
3689 if (cmd_match(buf, "none")) {
3690 mddev->persistent = 0;
e691063a
N
3691 mddev->external = 0;
3692 mddev->major_version = 0;
3693 mddev->minor_version = 90;
3694 return len;
3695 }
3696 if (strncmp(buf, "external:", 9) == 0) {
20a49ff6 3697 size_t namelen = len-9;
e691063a
N
3698 if (namelen >= sizeof(mddev->metadata_type))
3699 namelen = sizeof(mddev->metadata_type)-1;
3700 strncpy(mddev->metadata_type, buf+9, namelen);
3701 mddev->metadata_type[namelen] = 0;
3702 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3703 mddev->metadata_type[--namelen] = 0;
3704 mddev->persistent = 0;
3705 mddev->external = 1;
8bb93aac
N
3706 mddev->major_version = 0;
3707 mddev->minor_version = 90;
3708 return len;
3709 }
3710 major = simple_strtoul(buf, &e, 10);
3711 if (e==buf || *e != '.')
3712 return -EINVAL;
3713 buf = e+1;
3714 minor = simple_strtoul(buf, &e, 10);
3f9d7b0d 3715 if (e==buf || (*e && *e != '\n') )
8bb93aac 3716 return -EINVAL;
50511da3 3717 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
8bb93aac
N
3718 return -ENOENT;
3719 mddev->major_version = major;
3720 mddev->minor_version = minor;
3721 mddev->persistent = 1;
e691063a 3722 mddev->external = 0;
8bb93aac
N
3723 return len;
3724}
3725
3726static struct md_sysfs_entry md_metadata =
80ca3a44 3727__ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
8bb93aac 3728
24dd469d 3729static ssize_t
7eec314d 3730action_show(mddev_t *mddev, char *page)
24dd469d 3731{
7eec314d 3732 char *type = "idle";
b6a9ce68
N
3733 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3734 type = "frozen";
3735 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2b12ab6d 3736 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
ccfcc3c1
N
3737 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3738 type = "reshape";
3739 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N
3740 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3741 type = "resync";
3742 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3743 type = "check";
3744 else
3745 type = "repair";
72a23c21 3746 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
24dd469d
N
3747 type = "recover";
3748 }
3749 return sprintf(page, "%s\n", type);
3750}
3751
7ebc0be7
N
3752static void reap_sync_thread(mddev_t *mddev);
3753
24dd469d 3754static ssize_t
7eec314d 3755action_store(mddev_t *mddev, const char *page, size_t len)
24dd469d 3756{
7eec314d
N
3757 if (!mddev->pers || !mddev->pers->sync_request)
3758 return -EINVAL;
3759
b6a9ce68
N
3760 if (cmd_match(page, "frozen"))
3761 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3762 else
3763 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3764
3765 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
7eec314d
N
3766 if (mddev->sync_thread) {
3767 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7ebc0be7 3768 reap_sync_thread(mddev);
7eec314d 3769 }
03c902e1
N
3770 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3771 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 3772 return -EBUSY;
72a23c21
NB
3773 else if (cmd_match(page, "resync"))
3774 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3775 else if (cmd_match(page, "recover")) {
3776 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7eec314d 3777 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
72a23c21 3778 } else if (cmd_match(page, "reshape")) {
16484bf5
N
3779 int err;
3780 if (mddev->pers->start_reshape == NULL)
3781 return -EINVAL;
3782 err = mddev->pers->start_reshape(mddev);
3783 if (err)
3784 return err;
a99ac971 3785 sysfs_notify(&mddev->kobj, NULL, "degraded");
16484bf5 3786 } else {
bce74dac 3787 if (cmd_match(page, "check"))
7eec314d 3788 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2adc7d47 3789 else if (!cmd_match(page, "repair"))
7eec314d
N
3790 return -EINVAL;
3791 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3792 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7eec314d 3793 }
03c902e1 3794 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d 3795 md_wakeup_thread(mddev->thread);
00bcb4ac 3796 sysfs_notify_dirent_safe(mddev->sysfs_action);
24dd469d
N
3797 return len;
3798}
3799
9d88883e 3800static ssize_t
96de1e66 3801mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N
3802{
3803 return sprintf(page, "%llu\n",
3804 (unsigned long long) mddev->resync_mismatches);
3805}
3806
80ca3a44
N
3807static struct md_sysfs_entry md_scan_mode =
3808__ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 3809
96de1e66 3810
80ca3a44 3811static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 3812
88202a0c
N
3813static ssize_t
3814sync_min_show(mddev_t *mddev, char *page)
3815{
3816 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3817 mddev->sync_speed_min ? "local": "system");
3818}
3819
3820static ssize_t
3821sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3822{
3823 int min;
3824 char *e;
3825 if (strncmp(buf, "system", 6)==0) {
3826 mddev->sync_speed_min = 0;
3827 return len;
3828 }
3829 min = simple_strtoul(buf, &e, 10);
3830 if (buf == e || (*e && *e != '\n') || min <= 0)
3831 return -EINVAL;
3832 mddev->sync_speed_min = min;
3833 return len;
3834}
3835
3836static struct md_sysfs_entry md_sync_min =
3837__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3838
3839static ssize_t
3840sync_max_show(mddev_t *mddev, char *page)
3841{
3842 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3843 mddev->sync_speed_max ? "local": "system");
3844}
3845
3846static ssize_t
3847sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3848{
3849 int max;
3850 char *e;
3851 if (strncmp(buf, "system", 6)==0) {
3852 mddev->sync_speed_max = 0;
3853 return len;
3854 }
3855 max = simple_strtoul(buf, &e, 10);
3856 if (buf == e || (*e && *e != '\n') || max <= 0)
3857 return -EINVAL;
3858 mddev->sync_speed_max = max;
3859 return len;
3860}
3861
3862static struct md_sysfs_entry md_sync_max =
3863__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3864
d7f3d291
IP
3865static ssize_t
3866degraded_show(mddev_t *mddev, char *page)
3867{
3868 return sprintf(page, "%d\n", mddev->degraded);
3869}
3870static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
88202a0c 3871
90b08710
BS
3872static ssize_t
3873sync_force_parallel_show(mddev_t *mddev, char *page)
3874{
3875 return sprintf(page, "%d\n", mddev->parallel_resync);
3876}
3877
3878static ssize_t
3879sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3880{
3881 long n;
3882
3883 if (strict_strtol(buf, 10, &n))
3884 return -EINVAL;
3885
3886 if (n != 0 && n != 1)
3887 return -EINVAL;
3888
3889 mddev->parallel_resync = n;
3890
3891 if (mddev->sync_thread)
3892 wake_up(&resync_wait);
3893
3894 return len;
3895}
3896
3897/* force parallel resync, even with shared block devices */
3898static struct md_sysfs_entry md_sync_force_parallel =
3899__ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3900 sync_force_parallel_show, sync_force_parallel_store);
3901
88202a0c
N
3902static ssize_t
3903sync_speed_show(mddev_t *mddev, char *page)
3904{
3905 unsigned long resync, dt, db;
d1a7c503
N
3906 if (mddev->curr_resync == 0)
3907 return sprintf(page, "none\n");
9687a60c
AN
3908 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3909 dt = (jiffies - mddev->resync_mark) / HZ;
88202a0c 3910 if (!dt) dt++;
9687a60c
AN
3911 db = resync - mddev->resync_mark_cnt;
3912 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
88202a0c
N
3913}
3914
80ca3a44 3915static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
88202a0c
N
3916
3917static ssize_t
3918sync_completed_show(mddev_t *mddev, char *page)
3919{
58c0fed4 3920 unsigned long max_sectors, resync;
88202a0c 3921
acb180b0
N
3922 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3923 return sprintf(page, "none\n");
3924
88202a0c 3925 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
58c0fed4 3926 max_sectors = mddev->resync_max_sectors;
88202a0c 3927 else
58c0fed4 3928 max_sectors = mddev->dev_sectors;
88202a0c 3929
acb180b0 3930 resync = mddev->curr_resync_completed;
58c0fed4 3931 return sprintf(page, "%lu / %lu\n", resync, max_sectors);
88202a0c
N
3932}
3933
80ca3a44 3934static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
88202a0c 3935
5e96ee65
NB
3936static ssize_t
3937min_sync_show(mddev_t *mddev, char *page)
3938{
3939 return sprintf(page, "%llu\n",
3940 (unsigned long long)mddev->resync_min);
3941}
3942static ssize_t
3943min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3944{
3945 unsigned long long min;
3946 if (strict_strtoull(buf, 10, &min))
3947 return -EINVAL;
3948 if (min > mddev->resync_max)
3949 return -EINVAL;
3950 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3951 return -EBUSY;
3952
3953 /* Must be a multiple of chunk_size */
9d8f0363 3954 if (mddev->chunk_sectors) {
2ac06c33 3955 sector_t temp = min;
9d8f0363 3956 if (sector_div(temp, mddev->chunk_sectors))
5e96ee65
NB
3957 return -EINVAL;
3958 }
3959 mddev->resync_min = min;
3960
3961 return len;
3962}
3963
3964static struct md_sysfs_entry md_min_sync =
3965__ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3966
c6207277
N
3967static ssize_t
3968max_sync_show(mddev_t *mddev, char *page)
3969{
3970 if (mddev->resync_max == MaxSector)
3971 return sprintf(page, "max\n");
3972 else
3973 return sprintf(page, "%llu\n",
3974 (unsigned long long)mddev->resync_max);
3975}
3976static ssize_t
3977max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3978{
3979 if (strncmp(buf, "max", 3) == 0)
3980 mddev->resync_max = MaxSector;
3981 else {
5e96ee65
NB
3982 unsigned long long max;
3983 if (strict_strtoull(buf, 10, &max))
3984 return -EINVAL;
3985 if (max < mddev->resync_min)
c6207277
N
3986 return -EINVAL;
3987 if (max < mddev->resync_max &&
4d484a4a 3988 mddev->ro == 0 &&
c6207277
N
3989 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3990 return -EBUSY;
3991
3992 /* Must be a multiple of chunk_size */
9d8f0363 3993 if (mddev->chunk_sectors) {
2ac06c33 3994 sector_t temp = max;
9d8f0363 3995 if (sector_div(temp, mddev->chunk_sectors))
c6207277
N
3996 return -EINVAL;
3997 }
3998 mddev->resync_max = max;
3999 }
4000 wake_up(&mddev->recovery_wait);
4001 return len;
4002}
4003
4004static struct md_sysfs_entry md_max_sync =
4005__ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4006
e464eafd
N
4007static ssize_t
4008suspend_lo_show(mddev_t *mddev, char *page)
4009{
4010 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4011}
4012
4013static ssize_t
4014suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
4015{
4016 char *e;
4017 unsigned long long new = simple_strtoull(buf, &e, 10);
4018
b8d966ef
N
4019 if (mddev->pers == NULL ||
4020 mddev->pers->quiesce == NULL)
e464eafd
N
4021 return -EINVAL;
4022 if (buf == e || (*e && *e != '\n'))
4023 return -EINVAL;
4024 if (new >= mddev->suspend_hi ||
4025 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
4026 mddev->suspend_lo = new;
4027 mddev->pers->quiesce(mddev, 2);
4028 return len;
4029 } else
4030 return -EINVAL;
4031}
4032static struct md_sysfs_entry md_suspend_lo =
4033__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4034
4035
4036static ssize_t
4037suspend_hi_show(mddev_t *mddev, char *page)
4038{
4039 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4040}
4041
4042static ssize_t
4043suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
4044{
4045 char *e;
4046 unsigned long long new = simple_strtoull(buf, &e, 10);
4047
b8d966ef
N
4048 if (mddev->pers == NULL ||
4049 mddev->pers->quiesce == NULL)
e464eafd
N
4050 return -EINVAL;
4051 if (buf == e || (*e && *e != '\n'))
4052 return -EINVAL;
4053 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
4054 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
4055 mddev->suspend_hi = new;
4056 mddev->pers->quiesce(mddev, 1);
4057 mddev->pers->quiesce(mddev, 0);
4058 return len;
4059 } else
4060 return -EINVAL;
4061}
4062static struct md_sysfs_entry md_suspend_hi =
4063__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4064
08a02ecd
N
4065static ssize_t
4066reshape_position_show(mddev_t *mddev, char *page)
4067{
4068 if (mddev->reshape_position != MaxSector)
4069 return sprintf(page, "%llu\n",
4070 (unsigned long long)mddev->reshape_position);
4071 strcpy(page, "none\n");
4072 return 5;
4073}
4074
4075static ssize_t
4076reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
4077{
4078 char *e;
4079 unsigned long long new = simple_strtoull(buf, &e, 10);
4080 if (mddev->pers)
4081 return -EBUSY;
4082 if (buf == e || (*e && *e != '\n'))
4083 return -EINVAL;
4084 mddev->reshape_position = new;
4085 mddev->delta_disks = 0;
4086 mddev->new_level = mddev->level;
4087 mddev->new_layout = mddev->layout;
664e7c41 4088 mddev->new_chunk_sectors = mddev->chunk_sectors;
08a02ecd
N
4089 return len;
4090}
4091
4092static struct md_sysfs_entry md_reshape_position =
4093__ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4094 reshape_position_store);
4095
b522adcd
DW
4096static ssize_t
4097array_size_show(mddev_t *mddev, char *page)
4098{
4099 if (mddev->external_size)
4100 return sprintf(page, "%llu\n",
4101 (unsigned long long)mddev->array_sectors/2);
4102 else
4103 return sprintf(page, "default\n");
4104}
4105
4106static ssize_t
4107array_size_store(mddev_t *mddev, const char *buf, size_t len)
4108{
4109 sector_t sectors;
4110
4111 if (strncmp(buf, "default", 7) == 0) {
4112 if (mddev->pers)
4113 sectors = mddev->pers->size(mddev, 0, 0);
4114 else
4115 sectors = mddev->array_sectors;
4116
4117 mddev->external_size = 0;
4118 } else {
4119 if (strict_blocks_to_sectors(buf, &sectors) < 0)
4120 return -EINVAL;
4121 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
2b69c839 4122 return -E2BIG;
b522adcd
DW
4123
4124 mddev->external_size = 1;
4125 }
4126
4127 mddev->array_sectors = sectors;
4128 set_capacity(mddev->gendisk, mddev->array_sectors);
449aad3e
N
4129 if (mddev->pers)
4130 revalidate_disk(mddev->gendisk);
b522adcd
DW
4131
4132 return len;
4133}
4134
4135static struct md_sysfs_entry md_array_size =
4136__ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4137 array_size_store);
e464eafd 4138
eae1701f
N
4139static struct attribute *md_default_attrs[] = {
4140 &md_level.attr,
d4dbd025 4141 &md_layout.attr,
eae1701f 4142 &md_raid_disks.attr,
3b34380a 4143 &md_chunk_size.attr,
a35b0d69 4144 &md_size.attr,
a94213b1 4145 &md_resync_start.attr,
8bb93aac 4146 &md_metadata.attr,
6d7ff738 4147 &md_new_device.attr,
16f17b39 4148 &md_safe_delay.attr,
9e653b63 4149 &md_array_state.attr,
08a02ecd 4150 &md_reshape_position.attr,
b522adcd 4151 &md_array_size.attr,
1e50915f 4152 &max_corr_read_errors.attr,
411036fa
N
4153 NULL,
4154};
4155
4156static struct attribute *md_redundancy_attrs[] = {
24dd469d 4157 &md_scan_mode.attr,
9d88883e 4158 &md_mismatches.attr,
88202a0c
N
4159 &md_sync_min.attr,
4160 &md_sync_max.attr,
4161 &md_sync_speed.attr,
90b08710 4162 &md_sync_force_parallel.attr,
88202a0c 4163 &md_sync_completed.attr,
5e96ee65 4164 &md_min_sync.attr,
c6207277 4165 &md_max_sync.attr,
e464eafd
N
4166 &md_suspend_lo.attr,
4167 &md_suspend_hi.attr,
9b1d1dac 4168 &md_bitmap.attr,
d7f3d291 4169 &md_degraded.attr,
eae1701f
N
4170 NULL,
4171};
411036fa
N
4172static struct attribute_group md_redundancy_group = {
4173 .name = NULL,
4174 .attrs = md_redundancy_attrs,
4175};
4176
eae1701f
N
4177
4178static ssize_t
4179md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4180{
4181 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4182 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 4183 ssize_t rv;
eae1701f
N
4184
4185 if (!entry->show)
4186 return -EIO;
5dc5cf7d
IM
4187 rv = mddev_lock(mddev);
4188 if (!rv) {
4189 rv = entry->show(mddev, page);
4190 mddev_unlock(mddev);
4191 }
96de1e66 4192 return rv;
eae1701f
N
4193}
4194
4195static ssize_t
4196md_attr_store(struct kobject *kobj, struct attribute *attr,
4197 const char *page, size_t length)
4198{
4199 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4200 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 4201 ssize_t rv;
eae1701f
N
4202
4203 if (!entry->store)
4204 return -EIO;
67463acb
N
4205 if (!capable(CAP_SYS_ADMIN))
4206 return -EACCES;
5dc5cf7d 4207 rv = mddev_lock(mddev);
d3374825
N
4208 if (mddev->hold_active == UNTIL_IOCTL)
4209 mddev->hold_active = 0;
5dc5cf7d
IM
4210 if (!rv) {
4211 rv = entry->store(mddev, page, length);
4212 mddev_unlock(mddev);
4213 }
96de1e66 4214 return rv;
eae1701f
N
4215}
4216
4217static void md_free(struct kobject *ko)
4218{
4219 mddev_t *mddev = container_of(ko, mddev_t, kobj);
a21d1504
N
4220
4221 if (mddev->sysfs_state)
4222 sysfs_put(mddev->sysfs_state);
4223
4224 if (mddev->gendisk) {
4225 del_gendisk(mddev->gendisk);
4226 put_disk(mddev->gendisk);
4227 }
4228 if (mddev->queue)
4229 blk_cleanup_queue(mddev->queue);
4230
eae1701f
N
4231 kfree(mddev);
4232}
4233
52cf25d0 4234static const struct sysfs_ops md_sysfs_ops = {
eae1701f
N
4235 .show = md_attr_show,
4236 .store = md_attr_store,
4237};
4238static struct kobj_type md_ktype = {
4239 .release = md_free,
4240 .sysfs_ops = &md_sysfs_ops,
4241 .default_attrs = md_default_attrs,
4242};
4243
1da177e4
LT
4244int mdp_major = 0;
4245
5fd3a17e
DW
4246static void mddev_delayed_delete(struct work_struct *ws)
4247{
4248 mddev_t *mddev = container_of(ws, mddev_t, del_work);
4249
43a70507 4250 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
5fd3a17e
DW
4251 kobject_del(&mddev->kobj);
4252 kobject_put(&mddev->kobj);
4253}
4254
efeb53c0 4255static int md_alloc(dev_t dev, char *name)
1da177e4 4256{
48c9c27b 4257 static DEFINE_MUTEX(disks_mutex);
1da177e4
LT
4258 mddev_t *mddev = mddev_find(dev);
4259 struct gendisk *disk;
efeb53c0
N
4260 int partitioned;
4261 int shift;
4262 int unit;
3830c62f 4263 int error;
1da177e4
LT
4264
4265 if (!mddev)
efeb53c0
N
4266 return -ENODEV;
4267
4268 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4269 shift = partitioned ? MdpMinorShift : 0;
4270 unit = MINOR(mddev->unit) >> shift;
1da177e4 4271
e804ac78
TH
4272 /* wait for any previous instance of this device to be
4273 * completely removed (mddev_delayed_delete).
d3374825 4274 */
e804ac78 4275 flush_workqueue(md_misc_wq);
d3374825 4276
48c9c27b 4277 mutex_lock(&disks_mutex);
0909dc44
N
4278 error = -EEXIST;
4279 if (mddev->gendisk)
4280 goto abort;
efeb53c0
N
4281
4282 if (name) {
4283 /* Need to ensure that 'name' is not a duplicate.
4284 */
4285 mddev_t *mddev2;
4286 spin_lock(&all_mddevs_lock);
4287
4288 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4289 if (mddev2->gendisk &&
4290 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4291 spin_unlock(&all_mddevs_lock);
0909dc44 4292 goto abort;
efeb53c0
N
4293 }
4294 spin_unlock(&all_mddevs_lock);
1da177e4 4295 }
8b765398 4296
0909dc44 4297 error = -ENOMEM;
8b765398 4298 mddev->queue = blk_alloc_queue(GFP_KERNEL);
0909dc44
N
4299 if (!mddev->queue)
4300 goto abort;
409c57f3
N
4301 mddev->queue->queuedata = mddev;
4302
409c57f3 4303 blk_queue_make_request(mddev->queue, md_make_request);
8b765398 4304
1da177e4
LT
4305 disk = alloc_disk(1 << shift);
4306 if (!disk) {
8b765398
N
4307 blk_cleanup_queue(mddev->queue);
4308 mddev->queue = NULL;
0909dc44 4309 goto abort;
1da177e4 4310 }
efeb53c0 4311 disk->major = MAJOR(mddev->unit);
1da177e4 4312 disk->first_minor = unit << shift;
efeb53c0
N
4313 if (name)
4314 strcpy(disk->disk_name, name);
4315 else if (partitioned)
1da177e4 4316 sprintf(disk->disk_name, "md_d%d", unit);
ce7b0f46 4317 else
1da177e4 4318 sprintf(disk->disk_name, "md%d", unit);
1da177e4
LT
4319 disk->fops = &md_fops;
4320 disk->private_data = mddev;
4321 disk->queue = mddev->queue;
92850bbd 4322 /* Allow extended partitions. This makes the
d3374825 4323 * 'mdp' device redundant, but we can't really
92850bbd
N
4324 * remove it now.
4325 */
4326 disk->flags |= GENHD_FL_EXT_DEVT;
1da177e4
LT
4327 add_disk(disk);
4328 mddev->gendisk = disk;
ed9e1982
TH
4329 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4330 &disk_to_dev(disk)->kobj, "%s", "md");
0909dc44
N
4331 if (error) {
4332 /* This isn't possible, but as kobject_init_and_add is marked
4333 * __must_check, we must do something with the result
4334 */
5e55e2f5
N
4335 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4336 disk->disk_name);
0909dc44
N
4337 error = 0;
4338 }
00bcb4ac
N
4339 if (mddev->kobj.sd &&
4340 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
43a70507 4341 printk(KERN_DEBUG "pointless warning\n");
be20e6c6
DW
4342
4343 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
0909dc44
N
4344 abort:
4345 mutex_unlock(&disks_mutex);
00bcb4ac 4346 if (!error && mddev->kobj.sd) {
3830c62f 4347 kobject_uevent(&mddev->kobj, KOBJ_ADD);
00bcb4ac 4348 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
b62b7590 4349 }
d3374825 4350 mddev_put(mddev);
0909dc44 4351 return error;
efeb53c0
N
4352}
4353
4354static struct kobject *md_probe(dev_t dev, int *part, void *data)
4355{
4356 md_alloc(dev, NULL);
1da177e4
LT
4357 return NULL;
4358}
4359
efeb53c0
N
4360static int add_named_array(const char *val, struct kernel_param *kp)
4361{
4362 /* val must be "md_*" where * is not all digits.
4363 * We allocate an array with a large free minor number, and
4364 * set the name to val. val must not already be an active name.
4365 */
4366 int len = strlen(val);
4367 char buf[DISK_NAME_LEN];
4368
4369 while (len && val[len-1] == '\n')
4370 len--;
4371 if (len >= DISK_NAME_LEN)
4372 return -E2BIG;
4373 strlcpy(buf, val, len+1);
4374 if (strncmp(buf, "md_", 3) != 0)
4375 return -EINVAL;
4376 return md_alloc(0, buf);
4377}
4378
1da177e4
LT
4379static void md_safemode_timeout(unsigned long data)
4380{
4381 mddev_t *mddev = (mddev_t *) data;
4382
0fd62b86
NB
4383 if (!atomic_read(&mddev->writes_pending)) {
4384 mddev->safemode = 1;
4385 if (mddev->external)
00bcb4ac 4386 sysfs_notify_dirent_safe(mddev->sysfs_state);
0fd62b86 4387 }
1da177e4
LT
4388 md_wakeup_thread(mddev->thread);
4389}
4390
6ff8d8ec 4391static int start_dirty_degraded;
1da177e4 4392
390ee602 4393int md_run(mddev_t *mddev)
1da177e4 4394{
2604b703 4395 int err;
1da177e4 4396 mdk_rdev_t *rdev;
2604b703 4397 struct mdk_personality *pers;
1da177e4 4398
a757e64c
N
4399 if (list_empty(&mddev->disks))
4400 /* cannot run an array with no devices.. */
1da177e4 4401 return -EINVAL;
1da177e4
LT
4402
4403 if (mddev->pers)
4404 return -EBUSY;
bb4f1e9d
N
4405 /* Cannot run until previous stop completes properly */
4406 if (mddev->sysfs_active)
4407 return -EBUSY;
b6eb127d 4408
1da177e4
LT
4409 /*
4410 * Analyze all RAID superblock(s)
4411 */
1ec4a939
N
4412 if (!mddev->raid_disks) {
4413 if (!mddev->persistent)
4414 return -EINVAL;
a757e64c 4415 analyze_sbs(mddev);
1ec4a939 4416 }
1da177e4 4417
d9d166c2
N
4418 if (mddev->level != LEVEL_NONE)
4419 request_module("md-level-%d", mddev->level);
4420 else if (mddev->clevel[0])
4421 request_module("md-%s", mddev->clevel);
1da177e4
LT
4422
4423 /*
4424 * Drop all container device buffers, from now on
4425 * the only valid external interface is through the md
4426 * device.
1da177e4 4427 */
159ec1fc 4428 list_for_each_entry(rdev, &mddev->disks, same_set) {
b2d444d7 4429 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT
4430 continue;
4431 sync_blockdev(rdev->bdev);
f98393a6 4432 invalidate_bdev(rdev->bdev);
f0d76d70
N
4433
4434 /* perform some consistency tests on the device.
4435 * We don't want the data to overlap the metadata,
58c0fed4 4436 * Internal Bitmap issues have been handled elsewhere.
f0d76d70 4437 */
0f420358 4438 if (rdev->data_offset < rdev->sb_start) {
58c0fed4
AN
4439 if (mddev->dev_sectors &&
4440 rdev->data_offset + mddev->dev_sectors
0f420358 4441 > rdev->sb_start) {
f0d76d70
N
4442 printk("md: %s: data overlaps metadata\n",
4443 mdname(mddev));
4444 return -EINVAL;
4445 }
4446 } else {
0f420358 4447 if (rdev->sb_start + rdev->sb_size/512
f0d76d70
N
4448 > rdev->data_offset) {
4449 printk("md: %s: metadata overlaps data\n",
4450 mdname(mddev));
4451 return -EINVAL;
4452 }
4453 }
00bcb4ac 4454 sysfs_notify_dirent_safe(rdev->sysfs_state);
1da177e4
LT
4455 }
4456
a167f663
N
4457 if (mddev->bio_set == NULL)
4458 mddev->bio_set = bioset_create(BIO_POOL_SIZE, sizeof(mddev));
4459
1da177e4 4460 spin_lock(&pers_lock);
d9d166c2 4461 pers = find_pers(mddev->level, mddev->clevel);
2604b703 4462 if (!pers || !try_module_get(pers->owner)) {
1da177e4 4463 spin_unlock(&pers_lock);
d9d166c2
N
4464 if (mddev->level != LEVEL_NONE)
4465 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4466 mddev->level);
4467 else
4468 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4469 mddev->clevel);
1da177e4
LT
4470 return -EINVAL;
4471 }
2604b703 4472 mddev->pers = pers;
1da177e4 4473 spin_unlock(&pers_lock);
34817e8c
N
4474 if (mddev->level != pers->level) {
4475 mddev->level = pers->level;
4476 mddev->new_level = pers->level;
4477 }
d9d166c2 4478 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
1da177e4 4479
f6705578 4480 if (mddev->reshape_position != MaxSector &&
63c70c4f 4481 pers->start_reshape == NULL) {
f6705578
N
4482 /* This personality cannot handle reshaping... */
4483 mddev->pers = NULL;
4484 module_put(pers->owner);
4485 return -EINVAL;
4486 }
4487
7dd5e7c3
N
4488 if (pers->sync_request) {
4489 /* Warn if this is a potentially silly
4490 * configuration.
4491 */
4492 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4493 mdk_rdev_t *rdev2;
7dd5e7c3 4494 int warned = 0;
159ec1fc
CR
4495
4496 list_for_each_entry(rdev, &mddev->disks, same_set)
4497 list_for_each_entry(rdev2, &mddev->disks, same_set) {
7dd5e7c3
N
4498 if (rdev < rdev2 &&
4499 rdev->bdev->bd_contains ==
4500 rdev2->bdev->bd_contains) {
4501 printk(KERN_WARNING
4502 "%s: WARNING: %s appears to be"
4503 " on the same physical disk as"
4504 " %s.\n",
4505 mdname(mddev),
4506 bdevname(rdev->bdev,b),
4507 bdevname(rdev2->bdev,b2));
4508 warned = 1;
4509 }
4510 }
159ec1fc 4511
7dd5e7c3
N
4512 if (warned)
4513 printk(KERN_WARNING
4514 "True protection against single-disk"
4515 " failure might be compromised.\n");
4516 }
4517
657390d2 4518 mddev->recovery = 0;
58c0fed4
AN
4519 /* may be over-ridden by personality */
4520 mddev->resync_max_sectors = mddev->dev_sectors;
4521
6ff8d8ec 4522 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 4523
0f9552b5 4524 if (start_readonly && mddev->ro == 0)
f91de92e
N
4525 mddev->ro = 2; /* read-only, but switch on first write */
4526
b15c2e57 4527 err = mddev->pers->run(mddev);
13e53df3
AN
4528 if (err)
4529 printk(KERN_ERR "md: pers->run() failed ...\n");
b522adcd
DW
4530 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4531 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4532 " but 'external_size' not in effect?\n", __func__);
4533 printk(KERN_ERR
4534 "md: invalid array_size %llu > default size %llu\n",
4535 (unsigned long long)mddev->array_sectors / 2,
4536 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4537 err = -EINVAL;
4538 mddev->pers->stop(mddev);
4539 }
4540 if (err == 0 && mddev->pers->sync_request) {
b15c2e57
N
4541 err = bitmap_create(mddev);
4542 if (err) {
4543 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4544 mdname(mddev), err);
4545 mddev->pers->stop(mddev);
4546 }
4547 }
1da177e4 4548 if (err) {
1da177e4
LT
4549 module_put(mddev->pers->owner);
4550 mddev->pers = NULL;
32a7627c
N
4551 bitmap_destroy(mddev);
4552 return err;
1da177e4 4553 }
5e55e2f5 4554 if (mddev->pers->sync_request) {
00bcb4ac
N
4555 if (mddev->kobj.sd &&
4556 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5e55e2f5
N
4557 printk(KERN_WARNING
4558 "md: cannot register extra attributes for %s\n",
4559 mdname(mddev));
00bcb4ac 4560 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5e55e2f5 4561 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
fd9d49ca
N
4562 mddev->ro = 0;
4563
1da177e4 4564 atomic_set(&mddev->writes_pending,0);
1e50915f
RB
4565 atomic_set(&mddev->max_corr_read_errors,
4566 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
1da177e4
LT
4567 mddev->safemode = 0;
4568 mddev->safemode_timer.function = md_safemode_timeout;
4569 mddev->safemode_timer.data = (unsigned long) mddev;
16f17b39 4570 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
1da177e4 4571 mddev->in_sync = 1;
0ca69886
N
4572 smp_wmb();
4573 mddev->ready = 1;
159ec1fc 4574 list_for_each_entry(rdev, &mddev->disks, same_set)
86e6ffdd
N
4575 if (rdev->raid_disk >= 0) {
4576 char nm[20];
4577 sprintf(nm, "rd%d", rdev->raid_disk);
5e55e2f5 4578 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
00bcb4ac 4579 /* failure here is OK */;
86e6ffdd 4580 }
1da177e4
LT
4581
4582 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4583
850b2b42
N
4584 if (mddev->flags)
4585 md_update_sb(mddev, 0);
1da177e4 4586
0b8c9de0
N
4587 md_wakeup_thread(mddev->thread);
4588 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5fd6c1dc 4589
d7603b7e 4590 md_new_event(mddev);
00bcb4ac
N
4591 sysfs_notify_dirent_safe(mddev->sysfs_state);
4592 sysfs_notify_dirent_safe(mddev->sysfs_action);
a99ac971 4593 sysfs_notify(&mddev->kobj, NULL, "degraded");
1da177e4
LT
4594 return 0;
4595}
390ee602 4596EXPORT_SYMBOL_GPL(md_run);
1da177e4 4597
fe60b014
N
4598static int do_md_run(mddev_t *mddev)
4599{
4600 int err;
4601
4602 err = md_run(mddev);
4603 if (err)
4604 goto out;
69e51b44
N
4605 err = bitmap_load(mddev);
4606 if (err) {
4607 bitmap_destroy(mddev);
4608 goto out;
4609 }
fe60b014
N
4610 set_capacity(mddev->gendisk, mddev->array_sectors);
4611 revalidate_disk(mddev->gendisk);
4612 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4613out:
4614 return err;
4615}
4616
1da177e4
LT
4617static int restart_array(mddev_t *mddev)
4618{
4619 struct gendisk *disk = mddev->gendisk;
1da177e4 4620
80fab1d7 4621 /* Complain if it has no devices */
1da177e4 4622 if (list_empty(&mddev->disks))
80fab1d7
AN
4623 return -ENXIO;
4624 if (!mddev->pers)
4625 return -EINVAL;
4626 if (!mddev->ro)
4627 return -EBUSY;
4628 mddev->safemode = 0;
4629 mddev->ro = 0;
4630 set_disk_ro(disk, 0);
4631 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4632 mdname(mddev));
4633 /* Kick recovery or resync if necessary */
4634 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4635 md_wakeup_thread(mddev->thread);
4636 md_wakeup_thread(mddev->sync_thread);
00bcb4ac 4637 sysfs_notify_dirent_safe(mddev->sysfs_state);
80fab1d7 4638 return 0;
1da177e4
LT
4639}
4640
acc55e22
N
4641/* similar to deny_write_access, but accounts for our holding a reference
4642 * to the file ourselves */
4643static int deny_bitmap_write_access(struct file * file)
4644{
4645 struct inode *inode = file->f_mapping->host;
4646
4647 spin_lock(&inode->i_lock);
4648 if (atomic_read(&inode->i_writecount) > 1) {
4649 spin_unlock(&inode->i_lock);
4650 return -ETXTBSY;
4651 }
4652 atomic_set(&inode->i_writecount, -1);
4653 spin_unlock(&inode->i_lock);
4654
4655 return 0;
4656}
4657
43a70507 4658void restore_bitmap_write_access(struct file *file)
acc55e22
N
4659{
4660 struct inode *inode = file->f_mapping->host;
4661
4662 spin_lock(&inode->i_lock);
4663 atomic_set(&inode->i_writecount, 1);
4664 spin_unlock(&inode->i_lock);
4665}
4666
6177b472
N
4667static void md_clean(mddev_t *mddev)
4668{
4669 mddev->array_sectors = 0;
4670 mddev->external_size = 0;
4671 mddev->dev_sectors = 0;
4672 mddev->raid_disks = 0;
4673 mddev->recovery_cp = 0;
4674 mddev->resync_min = 0;
4675 mddev->resync_max = MaxSector;
4676 mddev->reshape_position = MaxSector;
4677 mddev->external = 0;
4678 mddev->persistent = 0;
4679 mddev->level = LEVEL_NONE;
4680 mddev->clevel[0] = 0;
4681 mddev->flags = 0;
4682 mddev->ro = 0;
4683 mddev->metadata_type[0] = 0;
4684 mddev->chunk_sectors = 0;
4685 mddev->ctime = mddev->utime = 0;
4686 mddev->layout = 0;
4687 mddev->max_disks = 0;
4688 mddev->events = 0;
a8707c08 4689 mddev->can_decrease_events = 0;
6177b472
N
4690 mddev->delta_disks = 0;
4691 mddev->new_level = LEVEL_NONE;
4692 mddev->new_layout = 0;
4693 mddev->new_chunk_sectors = 0;
4694 mddev->curr_resync = 0;
4695 mddev->resync_mismatches = 0;
4696 mddev->suspend_lo = mddev->suspend_hi = 0;
4697 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4698 mddev->recovery = 0;
4699 mddev->in_sync = 0;
4700 mddev->degraded = 0;
6177b472
N
4701 mddev->safemode = 0;
4702 mddev->bitmap_info.offset = 0;
4703 mddev->bitmap_info.default_offset = 0;
4704 mddev->bitmap_info.chunksize = 0;
4705 mddev->bitmap_info.daemon_sleep = 0;
4706 mddev->bitmap_info.max_write_behind = 0;
252ac522 4707 mddev->plug = NULL;
6177b472
N
4708}
4709
defad61a 4710static void __md_stop_writes(mddev_t *mddev)
a047e125
N
4711{
4712 if (mddev->sync_thread) {
4713 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4714 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7ebc0be7 4715 reap_sync_thread(mddev);
a047e125
N
4716 }
4717
4718 del_timer_sync(&mddev->safemode_timer);
4719
4720 bitmap_flush(mddev);
4721 md_super_wait(mddev);
4722
4723 if (!mddev->in_sync || mddev->flags) {
4724 /* mark array as shutdown cleanly */
4725 mddev->in_sync = 1;
4726 md_update_sb(mddev, 1);
4727 }
4728}
defad61a
N
4729
4730void md_stop_writes(mddev_t *mddev)
4731{
4732 mddev_lock(mddev);
4733 __md_stop_writes(mddev);
4734 mddev_unlock(mddev);
4735}
390ee602 4736EXPORT_SYMBOL_GPL(md_stop_writes);
a047e125 4737
390ee602 4738void md_stop(mddev_t *mddev)
6177b472 4739{
0ca69886 4740 mddev->ready = 0;
6177b472
N
4741 mddev->pers->stop(mddev);
4742 if (mddev->pers->sync_request && mddev->to_remove == NULL)
4743 mddev->to_remove = &md_redundancy_group;
4744 module_put(mddev->pers->owner);
4745 mddev->pers = NULL;
cca9cf90 4746 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6177b472 4747}
390ee602 4748EXPORT_SYMBOL_GPL(md_stop);
6177b472 4749
a4bd82d0
N
4750static int md_set_readonly(mddev_t *mddev, int is_open)
4751{
4752 int err = 0;
4753 mutex_lock(&mddev->open_mutex);
4754 if (atomic_read(&mddev->openers) > is_open) {
4755 printk("md: %s still in use.\n",mdname(mddev));
4756 err = -EBUSY;
4757 goto out;
4758 }
4759 if (mddev->pers) {
defad61a 4760 __md_stop_writes(mddev);
a4bd82d0
N
4761
4762 err = -ENXIO;
4763 if (mddev->ro==1)
4764 goto out;
4765 mddev->ro = 1;
4766 set_disk_ro(mddev->gendisk, 1);
4767 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
00bcb4ac 4768 sysfs_notify_dirent_safe(mddev->sysfs_state);
a4bd82d0
N
4769 err = 0;
4770 }
4771out:
4772 mutex_unlock(&mddev->open_mutex);
4773 return err;
4774}
4775
9e653b63
N
4776/* mode:
4777 * 0 - completely stop and dis-assemble array
9e653b63
N
4778 * 2 - stop but do not disassemble array
4779 */
df5b20cf 4780static int do_md_stop(mddev_t * mddev, int mode, int is_open)
1da177e4 4781{
1da177e4 4782 struct gendisk *disk = mddev->gendisk;
c4647292 4783 mdk_rdev_t *rdev;
1da177e4 4784
c8c00a69 4785 mutex_lock(&mddev->open_mutex);
bb4f1e9d
N
4786 if (atomic_read(&mddev->openers) > is_open ||
4787 mddev->sysfs_active) {
df5b20cf 4788 printk("md: %s still in use.\n",mdname(mddev));
6e17b027
N
4789 mutex_unlock(&mddev->open_mutex);
4790 return -EBUSY;
4791 }
1da177e4 4792
6e17b027 4793 if (mddev->pers) {
a4bd82d0
N
4794 if (mddev->ro)
4795 set_disk_ro(disk, 0);
409c57f3 4796
defad61a 4797 __md_stop_writes(mddev);
a4bd82d0
N
4798 md_stop(mddev);
4799 mddev->queue->merge_bvec_fn = NULL;
4800 mddev->queue->unplug_fn = NULL;
4801 mddev->queue->backing_dev_info.congested_fn = NULL;
6177b472 4802
a4bd82d0 4803 /* tell userspace to handle 'inactive' */
00bcb4ac 4804 sysfs_notify_dirent_safe(mddev->sysfs_state);
0d4ca600 4805
a4bd82d0
N
4806 list_for_each_entry(rdev, &mddev->disks, same_set)
4807 if (rdev->raid_disk >= 0) {
4808 char nm[20];
4809 sprintf(nm, "rd%d", rdev->raid_disk);
4810 sysfs_remove_link(&mddev->kobj, nm);
4811 }
c4647292 4812
a4bd82d0 4813 set_capacity(disk, 0);
6e17b027 4814 mutex_unlock(&mddev->open_mutex);
a4bd82d0 4815 revalidate_disk(disk);
0d4ca600 4816
a4bd82d0
N
4817 if (mddev->ro)
4818 mddev->ro = 0;
6e17b027
N
4819 } else
4820 mutex_unlock(&mddev->open_mutex);
1da177e4
LT
4821 /*
4822 * Free resources if final stop
4823 */
9e653b63 4824 if (mode == 0) {
1da177e4
LT
4825 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4826
978f946b 4827 bitmap_destroy(mddev);
c3d9714e
N
4828 if (mddev->bitmap_info.file) {
4829 restore_bitmap_write_access(mddev->bitmap_info.file);
4830 fput(mddev->bitmap_info.file);
4831 mddev->bitmap_info.file = NULL;
978f946b 4832 }
c3d9714e 4833 mddev->bitmap_info.offset = 0;
978f946b 4834
1da177e4
LT
4835 export_array(mddev);
4836
6177b472 4837 md_clean(mddev);
934d9c23 4838 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
efeb53c0
N
4839 if (mddev->hold_active == UNTIL_STOP)
4840 mddev->hold_active = 0;
a4bd82d0 4841 }
3f9d99c1 4842 blk_integrity_unregister(disk);
d7603b7e 4843 md_new_event(mddev);
00bcb4ac 4844 sysfs_notify_dirent_safe(mddev->sysfs_state);
6e17b027 4845 return 0;
1da177e4
LT
4846}
4847
fdee8ae4 4848#ifndef MODULE
1da177e4
LT
4849static void autorun_array(mddev_t *mddev)
4850{
4851 mdk_rdev_t *rdev;
1da177e4
LT
4852 int err;
4853
a757e64c 4854 if (list_empty(&mddev->disks))
1da177e4 4855 return;
1da177e4
LT
4856
4857 printk(KERN_INFO "md: running: ");
4858
159ec1fc 4859 list_for_each_entry(rdev, &mddev->disks, same_set) {
1da177e4
LT
4860 char b[BDEVNAME_SIZE];
4861 printk("<%s>", bdevname(rdev->bdev,b));
4862 }
4863 printk("\n");
4864
d710e138 4865 err = do_md_run(mddev);
1da177e4
LT
4866 if (err) {
4867 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
d710e138 4868 do_md_stop(mddev, 0, 0);
1da177e4
LT
4869 }
4870}
4871
4872/*
4873 * lets try to run arrays based on all disks that have arrived
4874 * until now. (those are in pending_raid_disks)
4875 *
4876 * the method: pick the first pending disk, collect all disks with
4877 * the same UUID, remove all from the pending list and put them into
4878 * the 'same_array' list. Then order this list based on superblock
4879 * update time (freshest comes first), kick out 'old' disks and
4880 * compare superblocks. If everything's fine then run it.
4881 *
4882 * If "unit" is allocated, then bump its reference count
4883 */
4884static void autorun_devices(int part)
4885{
159ec1fc 4886 mdk_rdev_t *rdev0, *rdev, *tmp;
1da177e4
LT
4887 mddev_t *mddev;
4888 char b[BDEVNAME_SIZE];
4889
4890 printk(KERN_INFO "md: autorun ...\n");
4891 while (!list_empty(&pending_raid_disks)) {
e8703fe1 4892 int unit;
1da177e4 4893 dev_t dev;
ad01c9e3 4894 LIST_HEAD(candidates);
1da177e4
LT
4895 rdev0 = list_entry(pending_raid_disks.next,
4896 mdk_rdev_t, same_set);
4897
4898 printk(KERN_INFO "md: considering %s ...\n",
4899 bdevname(rdev0->bdev,b));
4900 INIT_LIST_HEAD(&candidates);
159ec1fc 4901 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
1da177e4
LT
4902 if (super_90_load(rdev, rdev0, 0) >= 0) {
4903 printk(KERN_INFO "md: adding %s ...\n",
4904 bdevname(rdev->bdev,b));
4905 list_move(&rdev->same_set, &candidates);
4906 }
4907 /*
4908 * now we have a set of devices, with all of them having
4909 * mostly sane superblocks. It's time to allocate the
4910 * mddev.
4911 */
e8703fe1
N
4912 if (part) {
4913 dev = MKDEV(mdp_major,
4914 rdev0->preferred_minor << MdpMinorShift);
4915 unit = MINOR(dev) >> MdpMinorShift;
4916 } else {
4917 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4918 unit = MINOR(dev);
4919 }
4920 if (rdev0->preferred_minor != unit) {
1da177e4
LT
4921 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4922 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4923 break;
4924 }
1da177e4
LT
4925
4926 md_probe(dev, NULL, NULL);
4927 mddev = mddev_find(dev);
9bbbca3a
NB
4928 if (!mddev || !mddev->gendisk) {
4929 if (mddev)
4930 mddev_put(mddev);
4931 printk(KERN_ERR
1da177e4
LT
4932 "md: cannot allocate memory for md drive.\n");
4933 break;
4934 }
4935 if (mddev_lock(mddev))
4936 printk(KERN_WARNING "md: %s locked, cannot run\n",
4937 mdname(mddev));
4938 else if (mddev->raid_disks || mddev->major_version
4939 || !list_empty(&mddev->disks)) {
4940 printk(KERN_WARNING
4941 "md: %s already running, cannot run %s\n",
4942 mdname(mddev), bdevname(rdev0->bdev,b));
4943 mddev_unlock(mddev);
4944 } else {
4945 printk(KERN_INFO "md: created %s\n", mdname(mddev));
1ec4a939 4946 mddev->persistent = 1;
159ec1fc 4947 rdev_for_each_list(rdev, tmp, &candidates) {
1da177e4
LT
4948 list_del_init(&rdev->same_set);
4949 if (bind_rdev_to_array(rdev, mddev))
4950 export_rdev(rdev);
4951 }
4952 autorun_array(mddev);
4953 mddev_unlock(mddev);
4954 }
4955 /* on success, candidates will be empty, on error
4956 * it won't...
4957 */
159ec1fc 4958 rdev_for_each_list(rdev, tmp, &candidates) {
4b80991c 4959 list_del_init(&rdev->same_set);
1da177e4 4960 export_rdev(rdev);
4b80991c 4961 }
1da177e4
LT
4962 mddev_put(mddev);
4963 }
4964 printk(KERN_INFO "md: ... autorun DONE.\n");
4965}
fdee8ae4 4966#endif /* !MODULE */
1da177e4 4967
1da177e4
LT
4968static int get_version(void __user * arg)
4969{
4970 mdu_version_t ver;
4971
4972 ver.major = MD_MAJOR_VERSION;
4973 ver.minor = MD_MINOR_VERSION;
4974 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4975
4976 if (copy_to_user(arg, &ver, sizeof(ver)))
4977 return -EFAULT;
4978
4979 return 0;
4980}
4981
4982static int get_array_info(mddev_t * mddev, void __user * arg)
4983{
4984 mdu_array_info_t info;
a9f326eb 4985 int nr,working,insync,failed,spare;
1da177e4 4986 mdk_rdev_t *rdev;
1da177e4 4987
a9f326eb 4988 nr=working=insync=failed=spare=0;
159ec1fc 4989 list_for_each_entry(rdev, &mddev->disks, same_set) {
1da177e4 4990 nr++;
b2d444d7 4991 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT
4992 failed++;
4993 else {
4994 working++;
b2d444d7 4995 if (test_bit(In_sync, &rdev->flags))
a9f326eb 4996 insync++;
1da177e4
LT
4997 else
4998 spare++;
4999 }
5000 }
5001
5002 info.major_version = mddev->major_version;
5003 info.minor_version = mddev->minor_version;
5004 info.patch_version = MD_PATCHLEVEL_VERSION;
5005 info.ctime = mddev->ctime;
5006 info.level = mddev->level;
58c0fed4
AN
5007 info.size = mddev->dev_sectors / 2;
5008 if (info.size != mddev->dev_sectors / 2) /* overflow */
284ae7ca 5009 info.size = -1;
1da177e4
LT
5010 info.nr_disks = nr;
5011 info.raid_disks = mddev->raid_disks;
5012 info.md_minor = mddev->md_minor;
5013 info.not_persistent= !mddev->persistent;
5014
5015 info.utime = mddev->utime;
5016 info.state = 0;
5017 if (mddev->in_sync)
5018 info.state = (1<<MD_SB_CLEAN);
c3d9714e 5019 if (mddev->bitmap && mddev->bitmap_info.offset)
36fa3063 5020 info.state = (1<<MD_SB_BITMAP_PRESENT);
a9f326eb 5021 info.active_disks = insync;
1da177e4
LT
5022 info.working_disks = working;
5023 info.failed_disks = failed;
5024 info.spare_disks = spare;
5025
5026 info.layout = mddev->layout;
9d8f0363 5027 info.chunk_size = mddev->chunk_sectors << 9;
1da177e4
LT
5028
5029 if (copy_to_user(arg, &info, sizeof(info)))
5030 return -EFAULT;
5031
5032 return 0;
5033}
5034
87162a28 5035static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N
5036{
5037 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5038 char *ptr, *buf = NULL;
5039 int err = -ENOMEM;
5040
b5470dc5
DW
5041 if (md_allow_write(mddev))
5042 file = kmalloc(sizeof(*file), GFP_NOIO);
5043 else
5044 file = kmalloc(sizeof(*file), GFP_KERNEL);
2a2275d6 5045
32a7627c
N
5046 if (!file)
5047 goto out;
5048
5049 /* bitmap disabled, zero the first byte and copy out */
5050 if (!mddev->bitmap || !mddev->bitmap->file) {
5051 file->pathname[0] = '\0';
5052 goto copy_out;
5053 }
5054
5055 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
5056 if (!buf)
5057 goto out;
5058
6bcfd601
CH
5059 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
5060 if (IS_ERR(ptr))
32a7627c
N
5061 goto out;
5062
5063 strcpy(file->pathname, ptr);
5064
5065copy_out:
5066 err = 0;
5067 if (copy_to_user(arg, file, sizeof(*file)))
5068 err = -EFAULT;
5069out:
5070 kfree(buf);
5071 kfree(file);
5072 return err;
5073}
5074
1da177e4
LT
5075static int get_disk_info(mddev_t * mddev, void __user * arg)
5076{
5077 mdu_disk_info_t info;
1da177e4
LT
5078 mdk_rdev_t *rdev;
5079
5080 if (copy_from_user(&info, arg, sizeof(info)))
5081 return -EFAULT;
5082
26ef379f 5083 rdev = find_rdev_nr(mddev, info.number);
1da177e4
LT
5084 if (rdev) {
5085 info.major = MAJOR(rdev->bdev->bd_dev);
5086 info.minor = MINOR(rdev->bdev->bd_dev);
5087 info.raid_disk = rdev->raid_disk;
5088 info.state = 0;
b2d444d7 5089 if (test_bit(Faulty, &rdev->flags))
1da177e4 5090 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 5091 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT
5092 info.state |= (1<<MD_DISK_ACTIVE);
5093 info.state |= (1<<MD_DISK_SYNC);
5094 }
8ddf9efe
N
5095 if (test_bit(WriteMostly, &rdev->flags))
5096 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT
5097 } else {
5098 info.major = info.minor = 0;
5099 info.raid_disk = -1;
5100 info.state = (1<<MD_DISK_REMOVED);
5101 }
5102
5103 if (copy_to_user(arg, &info, sizeof(info)))
5104 return -EFAULT;
5105
5106 return 0;
5107}
5108
5109static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
5110{
5111 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5112 mdk_rdev_t *rdev;
5113 dev_t dev = MKDEV(info->major,info->minor);
5114
5115 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5116 return -EOVERFLOW;
5117
5118 if (!mddev->raid_disks) {
5119 int err;
5120 /* expecting a device which has a superblock */
5121 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5122 if (IS_ERR(rdev)) {
5123 printk(KERN_WARNING
5124 "md: md_import_device returned %ld\n",
5125 PTR_ERR(rdev));
5126 return PTR_ERR(rdev);
5127 }
5128 if (!list_empty(&mddev->disks)) {
5129 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
5130 mdk_rdev_t, same_set);
a9f326eb 5131 err = super_types[mddev->major_version]
1da177e4
LT
5132 .load_super(rdev, rdev0, mddev->minor_version);
5133 if (err < 0) {
5134 printk(KERN_WARNING
5135 "md: %s has different UUID to %s\n",
5136 bdevname(rdev->bdev,b),
5137 bdevname(rdev0->bdev,b2));
5138 export_rdev(rdev);
5139 return -EINVAL;
5140 }
5141 }
5142 err = bind_rdev_to_array(rdev, mddev);
5143 if (err)
5144 export_rdev(rdev);
5145 return err;
5146 }
5147
5148 /*
5149 * add_new_disk can be used once the array is assembled
5150 * to add "hot spares". They must already have a superblock
5151 * written
5152 */
5153 if (mddev->pers) {
5154 int err;
5155 if (!mddev->pers->hot_add_disk) {
5156 printk(KERN_WARNING
5157 "%s: personality does not support diskops!\n",
5158 mdname(mddev));
5159 return -EINVAL;
5160 }
7b1e35f6
N
5161 if (mddev->persistent)
5162 rdev = md_import_device(dev, mddev->major_version,
5163 mddev->minor_version);
5164 else
5165 rdev = md_import_device(dev, -1, -1);
1da177e4
LT
5166 if (IS_ERR(rdev)) {
5167 printk(KERN_WARNING
5168 "md: md_import_device returned %ld\n",
5169 PTR_ERR(rdev));
5170 return PTR_ERR(rdev);
5171 }
1a855a06 5172 /* set saved_raid_disk if appropriate */
41158c7e
N
5173 if (!mddev->persistent) {
5174 if (info->state & (1<<MD_DISK_SYNC) &&
bf572541 5175 info->raid_disk < mddev->raid_disks) {
41158c7e 5176 rdev->raid_disk = info->raid_disk;
bf572541
N
5177 set_bit(In_sync, &rdev->flags);
5178 } else
41158c7e
N
5179 rdev->raid_disk = -1;
5180 } else
5181 super_types[mddev->major_version].
5182 validate_super(mddev, rdev);
1a855a06
N
5183 if (test_bit(In_sync, &rdev->flags))
5184 rdev->saved_raid_disk = rdev->raid_disk;
5185 else
5186 rdev->saved_raid_disk = -1;
41158c7e 5187
b2d444d7 5188 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N
5189 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5190 set_bit(WriteMostly, &rdev->flags);
575a80fa
N
5191 else
5192 clear_bit(WriteMostly, &rdev->flags);
8ddf9efe 5193
1da177e4
LT
5194 rdev->raid_disk = -1;
5195 err = bind_rdev_to_array(rdev, mddev);
7c7546cc
N
5196 if (!err && !mddev->pers->hot_remove_disk) {
5197 /* If there is hot_add_disk but no hot_remove_disk
5198 * then added disks for geometry changes,
5199 * and should be added immediately.
5200 */
5201 super_types[mddev->major_version].
5202 validate_super(mddev, rdev);
5203 err = mddev->pers->hot_add_disk(mddev, rdev);
5204 if (err)
5205 unbind_rdev_from_array(rdev);
5206 }
1da177e4
LT
5207 if (err)
5208 export_rdev(rdev);
52664732 5209 else
00bcb4ac 5210 sysfs_notify_dirent_safe(rdev->sysfs_state);
c361777f 5211
17571284 5212 md_update_sb(mddev, 1);
72a23c21
NB
5213 if (mddev->degraded)
5214 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
c361777f 5215 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 5216 md_wakeup_thread(mddev->thread);
1da177e4
LT
5217 return err;
5218 }
5219
5220 /* otherwise, add_new_disk is only allowed
5221 * for major_version==0 superblocks
5222 */
5223 if (mddev->major_version != 0) {
5224 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5225 mdname(mddev));
5226 return -EINVAL;
5227 }
5228
5229 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5230 int err;
d710e138 5231 rdev = md_import_device(dev, -1, 0);
1da177e4
LT
5232 if (IS_ERR(rdev)) {
5233 printk(KERN_WARNING
5234 "md: error, md_import_device() returned %ld\n",
5235 PTR_ERR(rdev));
5236 return PTR_ERR(rdev);
5237 }
5238 rdev->desc_nr = info->number;
5239 if (info->raid_disk < mddev->raid_disks)
5240 rdev->raid_disk = info->raid_disk;
5241 else
5242 rdev->raid_disk = -1;
5243
1da177e4 5244 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N
5245 if (info->state & (1<<MD_DISK_SYNC))
5246 set_bit(In_sync, &rdev->flags);
1da177e4 5247
8ddf9efe
N
5248 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5249 set_bit(WriteMostly, &rdev->flags);
5250
1da177e4
LT
5251 if (!mddev->persistent) {
5252 printk(KERN_INFO "md: nonpersistent superblock ...\n");
77304d2a
MS
5253 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5254 } else
57b2caa3 5255 rdev->sb_start = calc_dev_sboffset(rdev);
8190e754 5256 rdev->sectors = rdev->sb_start;
1da177e4 5257
2bf071bf
N
5258 err = bind_rdev_to_array(rdev, mddev);
5259 if (err) {
5260 export_rdev(rdev);
5261 return err;
5262 }
1da177e4
LT
5263 }
5264
5265 return 0;
5266}
5267
5268static int hot_remove_disk(mddev_t * mddev, dev_t dev)
5269{
5270 char b[BDEVNAME_SIZE];
5271 mdk_rdev_t *rdev;
5272
1da177e4
LT
5273 rdev = find_rdev(mddev, dev);
5274 if (!rdev)
5275 return -ENXIO;
5276
5277 if (rdev->raid_disk >= 0)
5278 goto busy;
5279
5280 kick_rdev_from_array(rdev);
850b2b42 5281 md_update_sb(mddev, 1);
d7603b7e 5282 md_new_event(mddev);
1da177e4
LT
5283
5284 return 0;
5285busy:
fdefa4d8 5286 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
1da177e4
LT
5287 bdevname(rdev->bdev,b), mdname(mddev));
5288 return -EBUSY;
5289}
5290
5291static int hot_add_disk(mddev_t * mddev, dev_t dev)
5292{
5293 char b[BDEVNAME_SIZE];
5294 int err;
1da177e4
LT
5295 mdk_rdev_t *rdev;
5296
5297 if (!mddev->pers)
5298 return -ENODEV;
5299
5300 if (mddev->major_version != 0) {
5301 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5302 " version-0 superblocks.\n",
5303 mdname(mddev));
5304 return -EINVAL;
5305 }
5306 if (!mddev->pers->hot_add_disk) {
5307 printk(KERN_WARNING
5308 "%s: personality does not support diskops!\n",
5309 mdname(mddev));
5310 return -EINVAL;
5311 }
5312
d710e138 5313 rdev = md_import_device(dev, -1, 0);
1da177e4
LT
5314 if (IS_ERR(rdev)) {
5315 printk(KERN_WARNING
5316 "md: error, md_import_device() returned %ld\n",
5317 PTR_ERR(rdev));
5318 return -EINVAL;
5319 }
5320
5321 if (mddev->persistent)
57b2caa3 5322 rdev->sb_start = calc_dev_sboffset(rdev);
1da177e4 5323 else
77304d2a 5324 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
1da177e4 5325
8190e754 5326 rdev->sectors = rdev->sb_start;
1da177e4 5327
b2d444d7 5328 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT
5329 printk(KERN_WARNING
5330 "md: can not hot-add faulty %s disk to %s!\n",
5331 bdevname(rdev->bdev,b), mdname(mddev));
5332 err = -EINVAL;
5333 goto abort_export;
5334 }
b2d444d7 5335 clear_bit(In_sync, &rdev->flags);
1da177e4 5336 rdev->desc_nr = -1;
5842730d 5337 rdev->saved_raid_disk = -1;
2bf071bf
N
5338 err = bind_rdev_to_array(rdev, mddev);
5339 if (err)
5340 goto abort_export;
1da177e4
LT
5341
5342 /*
5343 * The rest should better be atomic, we can have disk failures
5344 * noticed in interrupt contexts ...
5345 */
5346
1da177e4
LT
5347 rdev->raid_disk = -1;
5348
850b2b42 5349 md_update_sb(mddev, 1);
1da177e4
LT
5350
5351 /*
5352 * Kick recovery, maybe this spare has to be added to the
5353 * array immediately.
5354 */
5355 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5356 md_wakeup_thread(mddev->thread);
d7603b7e 5357 md_new_event(mddev);
1da177e4
LT
5358 return 0;
5359
1da177e4
LT
5360abort_export:
5361 export_rdev(rdev);
5362 return err;
5363}
5364
32a7627c
N
5365static int set_bitmap_file(mddev_t *mddev, int fd)
5366{
5367 int err;
5368
36fa3063
N
5369 if (mddev->pers) {
5370 if (!mddev->pers->quiesce)
5371 return -EBUSY;
5372 if (mddev->recovery || mddev->sync_thread)
5373 return -EBUSY;
5374 /* we should be able to change the bitmap.. */
5375 }
32a7627c 5376
32a7627c 5377
36fa3063
N
5378 if (fd >= 0) {
5379 if (mddev->bitmap)
5380 return -EEXIST; /* cannot add when bitmap is present */
c3d9714e 5381 mddev->bitmap_info.file = fget(fd);
32a7627c 5382
c3d9714e 5383 if (mddev->bitmap_info.file == NULL) {
36fa3063
N
5384 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5385 mdname(mddev));
5386 return -EBADF;
5387 }
5388
c3d9714e 5389 err = deny_bitmap_write_access(mddev->bitmap_info.file);
36fa3063
N
5390 if (err) {
5391 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5392 mdname(mddev));
c3d9714e
N
5393 fput(mddev->bitmap_info.file);
5394 mddev->bitmap_info.file = NULL;
36fa3063
N
5395 return err;
5396 }
c3d9714e 5397 mddev->bitmap_info.offset = 0; /* file overrides offset */
36fa3063
N
5398 } else if (mddev->bitmap == NULL)
5399 return -ENOENT; /* cannot remove what isn't there */
5400 err = 0;
5401 if (mddev->pers) {
5402 mddev->pers->quiesce(mddev, 1);
69e51b44 5403 if (fd >= 0) {
36fa3063 5404 err = bitmap_create(mddev);
69e51b44
N
5405 if (!err)
5406 err = bitmap_load(mddev);
5407 }
d7375ab3 5408 if (fd < 0 || err) {
36fa3063 5409 bitmap_destroy(mddev);
d7375ab3
N
5410 fd = -1; /* make sure to put the file */
5411 }
36fa3063 5412 mddev->pers->quiesce(mddev, 0);
d7375ab3
N
5413 }
5414 if (fd < 0) {
c3d9714e
N
5415 if (mddev->bitmap_info.file) {
5416 restore_bitmap_write_access(mddev->bitmap_info.file);
5417 fput(mddev->bitmap_info.file);
acc55e22 5418 }
c3d9714e 5419 mddev->bitmap_info.file = NULL;
36fa3063
N
5420 }
5421
32a7627c
N
5422 return err;
5423}
5424
1da177e4
LT
5425/*
5426 * set_array_info is used two different ways
5427 * The original usage is when creating a new array.
5428 * In this usage, raid_disks is > 0 and it together with
5429 * level, size, not_persistent,layout,chunksize determine the
5430 * shape of the array.
5431 * This will always create an array with a type-0.90.0 superblock.
5432 * The newer usage is when assembling an array.
5433 * In this case raid_disks will be 0, and the major_version field is
5434 * use to determine which style super-blocks are to be found on the devices.
5435 * The minor and patch _version numbers are also kept incase the
5436 * super_block handler wishes to interpret them.
5437 */
5438static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5439{
5440
5441 if (info->raid_disks == 0) {
5442 /* just setting version number for superblock loading */
5443 if (info->major_version < 0 ||
50511da3 5444 info->major_version >= ARRAY_SIZE(super_types) ||
1da177e4
LT
5445 super_types[info->major_version].name == NULL) {
5446 /* maybe try to auto-load a module? */
5447 printk(KERN_INFO
5448 "md: superblock version %d not known\n",
5449 info->major_version);
5450 return -EINVAL;
5451 }
5452 mddev->major_version = info->major_version;
5453 mddev->minor_version = info->minor_version;
5454 mddev->patch_version = info->patch_version;
3f9d7b0d 5455 mddev->persistent = !info->not_persistent;
cbd19983
N
5456 /* ensure mddev_put doesn't delete this now that there
5457 * is some minimal configuration.
5458 */
5459 mddev->ctime = get_seconds();
1da177e4
LT
5460 return 0;
5461 }
5462 mddev->major_version = MD_MAJOR_VERSION;
5463 mddev->minor_version = MD_MINOR_VERSION;
5464 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5465 mddev->ctime = get_seconds();
5466
5467 mddev->level = info->level;
17115e03 5468 mddev->clevel[0] = 0;
58c0fed4 5469 mddev->dev_sectors = 2 * (sector_t)info->size;
1da177e4
LT
5470 mddev->raid_disks = info->raid_disks;
5471 /* don't set md_minor, it is determined by which /dev/md* was
5472 * openned
5473 */
5474 if (info->state & (1<<MD_SB_CLEAN))
5475 mddev->recovery_cp = MaxSector;
5476 else
5477 mddev->recovery_cp = 0;
5478 mddev->persistent = ! info->not_persistent;
e691063a 5479 mddev->external = 0;
1da177e4
LT
5480
5481 mddev->layout = info->layout;
9d8f0363 5482 mddev->chunk_sectors = info->chunk_size >> 9;
1da177e4
LT
5483
5484 mddev->max_disks = MD_SB_DISKS;
5485
e691063a
N
5486 if (mddev->persistent)
5487 mddev->flags = 0;
850b2b42 5488 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 5489
c3d9714e
N
5490 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
5491 mddev->bitmap_info.offset = 0;
b2a2703c 5492
f6705578
N
5493 mddev->reshape_position = MaxSector;
5494
1da177e4
LT
5495 /*
5496 * Generate a 128 bit UUID
5497 */
5498 get_random_bytes(mddev->uuid, 16);
5499
f6705578 5500 mddev->new_level = mddev->level;
664e7c41 5501 mddev->new_chunk_sectors = mddev->chunk_sectors;
f6705578
N
5502 mddev->new_layout = mddev->layout;
5503 mddev->delta_disks = 0;
5504
1da177e4
LT
5505 return 0;
5506}
5507
1f403624
DW
5508void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5509{
b522adcd
DW
5510 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5511
5512 if (mddev->external_size)
5513 return;
5514
1f403624
DW
5515 mddev->array_sectors = array_sectors;
5516}
5517EXPORT_SYMBOL(md_set_array_sectors);
5518
d71f9f88 5519static int update_size(mddev_t *mddev, sector_t num_sectors)
a35b0d69 5520{
159ec1fc 5521 mdk_rdev_t *rdev;
a35b0d69 5522 int rv;
d71f9f88 5523 int fit = (num_sectors == 0);
a35b0d69
N
5524
5525 if (mddev->pers->resize == NULL)
5526 return -EINVAL;
d71f9f88
AN
5527 /* The "num_sectors" is the number of sectors of each device that
5528 * is used. This can only make sense for arrays with redundancy.
5529 * linear and raid0 always use whatever space is available. We can only
5530 * consider changing this number if no resync or reconstruction is
5531 * happening, and if the new size is acceptable. It must fit before the
0f420358 5532 * sb_start or, if that is <data_offset, it must fit before the size
d71f9f88
AN
5533 * of each device. If num_sectors is zero, we find the largest size
5534 * that fits.
5535
a35b0d69
N
5536 */
5537 if (mddev->sync_thread)
5538 return -EBUSY;
dba034ee
N
5539 if (mddev->bitmap)
5540 /* Sorry, cannot grow a bitmap yet, just remove it,
5541 * grow, and re-add.
5542 */
5543 return -EBUSY;
159ec1fc 5544 list_for_each_entry(rdev, &mddev->disks, same_set) {
dd8ac336 5545 sector_t avail = rdev->sectors;
01ab5662 5546
d71f9f88
AN
5547 if (fit && (num_sectors == 0 || num_sectors > avail))
5548 num_sectors = avail;
5549 if (avail < num_sectors)
a35b0d69
N
5550 return -ENOSPC;
5551 }
d71f9f88 5552 rv = mddev->pers->resize(mddev, num_sectors);
449aad3e
N
5553 if (!rv)
5554 revalidate_disk(mddev->gendisk);
a35b0d69
N
5555 return rv;
5556}
5557
da943b99
N
5558static int update_raid_disks(mddev_t *mddev, int raid_disks)
5559{
5560 int rv;
5561 /* change the number of raid disks */
63c70c4f 5562 if (mddev->pers->check_reshape == NULL)
da943b99
N
5563 return -EINVAL;
5564 if (raid_disks <= 0 ||
233fca36 5565 (mddev->max_disks && raid_disks >= mddev->max_disks))
da943b99 5566 return -EINVAL;
63c70c4f 5567 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
da943b99 5568 return -EBUSY;
63c70c4f
N
5569 mddev->delta_disks = raid_disks - mddev->raid_disks;
5570
5571 rv = mddev->pers->check_reshape(mddev);
da943b99
N
5572 return rv;
5573}
5574
5575
1da177e4
LT
5576/*
5577 * update_array_info is used to change the configuration of an
5578 * on-line array.
5579 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5580 * fields in the info are checked against the array.
5581 * Any differences that cannot be handled will cause an error.
5582 * Normally, only one change can be managed at a time.
5583 */
5584static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5585{
5586 int rv = 0;
5587 int cnt = 0;
36fa3063
N
5588 int state = 0;
5589
5590 /* calculate expected state,ignoring low bits */
c3d9714e 5591 if (mddev->bitmap && mddev->bitmap_info.offset)
36fa3063 5592 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT
5593
5594 if (mddev->major_version != info->major_version ||
5595 mddev->minor_version != info->minor_version ||
5596/* mddev->patch_version != info->patch_version || */
5597 mddev->ctime != info->ctime ||
5598 mddev->level != info->level ||
5599/* mddev->layout != info->layout || */
5600 !mddev->persistent != info->not_persistent||
9d8f0363 5601 mddev->chunk_sectors != info->chunk_size >> 9 ||
36fa3063
N
5602 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5603 ((state^info->state) & 0xfffffe00)
5604 )
1da177e4
LT
5605 return -EINVAL;
5606 /* Check there is only one change */
58c0fed4
AN
5607 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5608 cnt++;
5609 if (mddev->raid_disks != info->raid_disks)
5610 cnt++;
5611 if (mddev->layout != info->layout)
5612 cnt++;
5613 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5614 cnt++;
5615 if (cnt == 0)
5616 return 0;
5617 if (cnt > 1)
5618 return -EINVAL;
1da177e4
LT
5619
5620 if (mddev->layout != info->layout) {
5621 /* Change layout
5622 * we don't need to do anything at the md level, the
5623 * personality will take care of it all.
5624 */
50ac168a 5625 if (mddev->pers->check_reshape == NULL)
1da177e4 5626 return -EINVAL;
597a711b
N
5627 else {
5628 mddev->new_layout = info->layout;
50ac168a 5629 rv = mddev->pers->check_reshape(mddev);
597a711b
N
5630 if (rv)
5631 mddev->new_layout = mddev->layout;
5632 return rv;
5633 }
1da177e4 5634 }
58c0fed4 5635 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
d71f9f88 5636 rv = update_size(mddev, (sector_t)info->size * 2);
a35b0d69 5637
da943b99
N
5638 if (mddev->raid_disks != info->raid_disks)
5639 rv = update_raid_disks(mddev, info->raid_disks);
5640
36fa3063
N
5641 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5642 if (mddev->pers->quiesce == NULL)
5643 return -EINVAL;
5644 if (mddev->recovery || mddev->sync_thread)
5645 return -EBUSY;
5646 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5647 /* add the bitmap */
5648 if (mddev->bitmap)
5649 return -EEXIST;
c3d9714e 5650 if (mddev->bitmap_info.default_offset == 0)
36fa3063 5651 return -EINVAL;
c3d9714e
N
5652 mddev->bitmap_info.offset =
5653 mddev->bitmap_info.default_offset;
36fa3063
N
5654 mddev->pers->quiesce(mddev, 1);
5655 rv = bitmap_create(mddev);
69e51b44
N
5656 if (!rv)
5657 rv = bitmap_load(mddev);
36fa3063
N
5658 if (rv)
5659 bitmap_destroy(mddev);
5660 mddev->pers->quiesce(mddev, 0);
5661 } else {
5662 /* remove the bitmap */
5663 if (!mddev->bitmap)
5664 return -ENOENT;
5665 if (mddev->bitmap->file)
5666 return -EINVAL;
5667 mddev->pers->quiesce(mddev, 1);
5668 bitmap_destroy(mddev);
5669 mddev->pers->quiesce(mddev, 0);
c3d9714e 5670 mddev->bitmap_info.offset = 0;
36fa3063
N
5671 }
5672 }
850b2b42 5673 md_update_sb(mddev, 1);
1da177e4
LT
5674 return rv;
5675}
5676
5677static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5678{
5679 mdk_rdev_t *rdev;
5680
5681 if (mddev->pers == NULL)
5682 return -ENODEV;
5683
5684 rdev = find_rdev(mddev, dev);
5685 if (!rdev)
5686 return -ENODEV;
5687
5688 md_error(mddev, rdev);
5689 return 0;
5690}
5691
2f9618ce
AN
5692/*
5693 * We have a problem here : there is no easy way to give a CHS
5694 * virtual geometry. We currently pretend that we have a 2 heads
5695 * 4 sectors (with a BIG number of cylinders...). This drives
5696 * dosfs just mad... ;-)
5697 */
a885c8c4
CH
5698static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5699{
5700 mddev_t *mddev = bdev->bd_disk->private_data;
5701
5702 geo->heads = 2;
5703 geo->sectors = 4;
49ce6cea 5704 geo->cylinders = mddev->array_sectors / 8;
a885c8c4
CH
5705 return 0;
5706}
5707
a39907fa 5708static int md_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT
5709 unsigned int cmd, unsigned long arg)
5710{
5711 int err = 0;
5712 void __user *argp = (void __user *)arg;
1da177e4 5713 mddev_t *mddev = NULL;
e2218350 5714 int ro;
1da177e4
LT
5715
5716 if (!capable(CAP_SYS_ADMIN))
5717 return -EACCES;
5718
5719 /*
5720 * Commands dealing with the RAID driver but not any
5721 * particular array:
5722 */
5723 switch (cmd)
5724 {
5725 case RAID_VERSION:
5726 err = get_version(argp);
5727 goto done;
5728
5729 case PRINT_RAID_DEBUG:
5730 err = 0;
5731 md_print_devices();
5732 goto done;
5733
5734#ifndef MODULE
5735 case RAID_AUTORUN:
5736 err = 0;
5737 autostart_arrays(arg);
5738 goto done;
5739#endif
5740 default:;
5741 }
5742
5743 /*
5744 * Commands creating/starting a new array:
5745 */
5746
a39907fa 5747 mddev = bdev->bd_disk->private_data;
1da177e4
LT
5748
5749 if (!mddev) {
5750 BUG();
5751 goto abort;
5752 }
5753
1da177e4
LT
5754 err = mddev_lock(mddev);
5755 if (err) {
5756 printk(KERN_INFO
5757 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5758 err, cmd);
5759 goto abort;
5760 }
5761
5762 switch (cmd)
5763 {
5764 case SET_ARRAY_INFO:
5765 {
5766 mdu_array_info_t info;
5767 if (!arg)
5768 memset(&info, 0, sizeof(info));
5769 else if (copy_from_user(&info, argp, sizeof(info))) {
5770 err = -EFAULT;
5771 goto abort_unlock;
5772 }
5773 if (mddev->pers) {
5774 err = update_array_info(mddev, &info);
5775 if (err) {
5776 printk(KERN_WARNING "md: couldn't update"
5777 " array info. %d\n", err);
5778 goto abort_unlock;
5779 }
5780 goto done_unlock;
5781 }
5782 if (!list_empty(&mddev->disks)) {
5783 printk(KERN_WARNING
5784 "md: array %s already has disks!\n",
5785 mdname(mddev));
5786 err = -EBUSY;
5787 goto abort_unlock;
5788 }
5789 if (mddev->raid_disks) {
5790 printk(KERN_WARNING
5791 "md: array %s already initialised!\n",
5792 mdname(mddev));
5793 err = -EBUSY;
5794 goto abort_unlock;
5795 }
5796 err = set_array_info(mddev, &info);
5797 if (err) {
5798 printk(KERN_WARNING "md: couldn't set"
5799 " array info. %d\n", err);
5800 goto abort_unlock;
5801 }
5802 }
5803 goto done_unlock;
5804
5805 default:;
5806 }
5807
5808 /*
5809 * Commands querying/configuring an existing array:
5810 */
32a7627c 5811 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3f9d7b0d 5812 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
a17184a9
N
5813 if ((!mddev->raid_disks && !mddev->external)
5814 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5815 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5816 && cmd != GET_BITMAP_FILE) {
1da177e4
LT
5817 err = -ENODEV;
5818 goto abort_unlock;
5819 }
5820
5821 /*
5822 * Commands even a read-only array can execute:
5823 */
5824 switch (cmd)
5825 {
5826 case GET_ARRAY_INFO:
5827 err = get_array_info(mddev, argp);
5828 goto done_unlock;
5829
32a7627c 5830 case GET_BITMAP_FILE:
87162a28 5831 err = get_bitmap_file(mddev, argp);
32a7627c
N
5832 goto done_unlock;
5833
1da177e4
LT
5834 case GET_DISK_INFO:
5835 err = get_disk_info(mddev, argp);
5836 goto done_unlock;
5837
5838 case RESTART_ARRAY_RW:
5839 err = restart_array(mddev);
5840 goto done_unlock;
5841
5842 case STOP_ARRAY:
d710e138 5843 err = do_md_stop(mddev, 0, 1);
1da177e4
LT
5844 goto done_unlock;
5845
5846 case STOP_ARRAY_RO:
a4bd82d0 5847 err = md_set_readonly(mddev, 1);
1da177e4
LT
5848 goto done_unlock;
5849
e2218350
DW
5850 case BLKROSET:
5851 if (get_user(ro, (int __user *)(arg))) {
5852 err = -EFAULT;
5853 goto done_unlock;
5854 }
5855 err = -EINVAL;
5856
5857 /* if the bdev is going readonly the value of mddev->ro
5858 * does not matter, no writes are coming
5859 */
5860 if (ro)
5861 goto done_unlock;
5862
5863 /* are we are already prepared for writes? */
5864 if (mddev->ro != 1)
5865 goto done_unlock;
5866
5867 /* transitioning to readauto need only happen for
5868 * arrays that call md_write_start
5869 */
5870 if (mddev->pers) {
5871 err = restart_array(mddev);
5872 if (err == 0) {
5873 mddev->ro = 2;
5874 set_disk_ro(mddev->gendisk, 0);
5875 }
5876 }
5877 goto done_unlock;
1da177e4
LT
5878 }
5879
5880 /*
5881 * The remaining ioctls are changing the state of the
f91de92e
N
5882 * superblock, so we do not allow them on read-only arrays.
5883 * However non-MD ioctls (e.g. get-size) will still come through
5884 * here and hit the 'default' below, so only disallow
5885 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 5886 */
bb57fc64 5887 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
f91de92e
N
5888 if (mddev->ro == 2) {
5889 mddev->ro = 0;
00bcb4ac 5890 sysfs_notify_dirent_safe(mddev->sysfs_state);
0fd62b86
NB
5891 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5892 md_wakeup_thread(mddev->thread);
f91de92e
N
5893 } else {
5894 err = -EROFS;
5895 goto abort_unlock;
5896 }
1da177e4
LT
5897 }
5898
5899 switch (cmd)
5900 {
5901 case ADD_NEW_DISK:
5902 {
5903 mdu_disk_info_t info;
5904 if (copy_from_user(&info, argp, sizeof(info)))
5905 err = -EFAULT;
5906 else
5907 err = add_new_disk(mddev, &info);
5908 goto done_unlock;
5909 }
5910
5911 case HOT_REMOVE_DISK:
5912 err = hot_remove_disk(mddev, new_decode_dev(arg));
5913 goto done_unlock;
5914
5915 case HOT_ADD_DISK:
5916 err = hot_add_disk(mddev, new_decode_dev(arg));
5917 goto done_unlock;
5918
5919 case SET_DISK_FAULTY:
5920 err = set_disk_faulty(mddev, new_decode_dev(arg));
5921 goto done_unlock;
5922
5923 case RUN_ARRAY:
d710e138 5924 err = do_md_run(mddev);
1da177e4
LT
5925 goto done_unlock;
5926
32a7627c
N
5927 case SET_BITMAP_FILE:
5928 err = set_bitmap_file(mddev, (int)arg);
5929 goto done_unlock;
5930
1da177e4 5931 default:
1da177e4
LT
5932 err = -EINVAL;
5933 goto abort_unlock;
5934 }
5935
5936done_unlock:
5937abort_unlock:
d3374825
N
5938 if (mddev->hold_active == UNTIL_IOCTL &&
5939 err != -EINVAL)
5940 mddev->hold_active = 0;
1da177e4
LT
5941 mddev_unlock(mddev);
5942
5943 return err;
5944done:
5945 if (err)
5946 MD_BUG();
5947abort:
5948 return err;
5949}
aa98aa31
AB
5950#ifdef CONFIG_COMPAT
5951static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
5952 unsigned int cmd, unsigned long arg)
5953{
5954 switch (cmd) {
5955 case HOT_REMOVE_DISK:
5956 case HOT_ADD_DISK:
5957 case SET_DISK_FAULTY:
5958 case SET_BITMAP_FILE:
5959 /* These take in integer arg, do not convert */
5960 break;
5961 default:
5962 arg = (unsigned long)compat_ptr(arg);
5963 break;
5964 }
5965
5966 return md_ioctl(bdev, mode, cmd, arg);
5967}
5968#endif /* CONFIG_COMPAT */
1da177e4 5969
a39907fa 5970static int md_open(struct block_device *bdev, fmode_t mode)
1da177e4
LT
5971{
5972 /*
5973 * Succeed if we can lock the mddev, which confirms that
5974 * it isn't being stopped right now.
5975 */
d3374825 5976 mddev_t *mddev = mddev_find(bdev->bd_dev);
1da177e4
LT
5977 int err;
5978
d3374825
N
5979 if (mddev->gendisk != bdev->bd_disk) {
5980 /* we are racing with mddev_put which is discarding this
5981 * bd_disk.
5982 */
5983 mddev_put(mddev);
5984 /* Wait until bdev->bd_disk is definitely gone */
e804ac78 5985 flush_workqueue(md_misc_wq);
d3374825
N
5986 /* Then retry the open from the top */
5987 return -ERESTARTSYS;
5988 }
5989 BUG_ON(mddev != bdev->bd_disk->private_data);
5990
c8c00a69 5991 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
1da177e4
LT
5992 goto out;
5993
5994 err = 0;
f2ea68cf 5995 atomic_inc(&mddev->openers);
c8c00a69 5996 mutex_unlock(&mddev->open_mutex);
1da177e4 5997
f3b99be1 5998 check_disk_size_change(mddev->gendisk, bdev);
1da177e4
LT
5999 out:
6000 return err;
6001}
6002
a39907fa 6003static int md_release(struct gendisk *disk, fmode_t mode)
1da177e4 6004{
a39907fa 6005 mddev_t *mddev = disk->private_data;
1da177e4 6006
52e5f9d1 6007 BUG_ON(!mddev);
f2ea68cf 6008 atomic_dec(&mddev->openers);
1da177e4
LT
6009 mddev_put(mddev);
6010
6011 return 0;
6012}
83d5cde4 6013static const struct block_device_operations md_fops =
1da177e4
LT
6014{
6015 .owner = THIS_MODULE,
a39907fa
AV
6016 .open = md_open,
6017 .release = md_release,
b492b852 6018 .ioctl = md_ioctl,
aa98aa31
AB
6019#ifdef CONFIG_COMPAT
6020 .compat_ioctl = md_compat_ioctl,
6021#endif
a885c8c4 6022 .getgeo = md_getgeo,
1da177e4
LT
6023};
6024
75c96f85 6025static int md_thread(void * arg)
1da177e4
LT
6026{
6027 mdk_thread_t *thread = arg;
6028
1da177e4
LT
6029 /*
6030 * md_thread is a 'system-thread', it's priority should be very
6031 * high. We avoid resource deadlocks individually in each
6032 * raid personality. (RAID5 does preallocation) We also use RR and
6033 * the very same RT priority as kswapd, thus we will never get
6034 * into a priority inversion deadlock.
6035 *
6036 * we definitely have to have equal or higher priority than
6037 * bdflush, otherwise bdflush will deadlock if there are too
6038 * many dirty RAID5 blocks.
6039 */
1da177e4 6040
6985c43f 6041 allow_signal(SIGKILL);
a6fb0934 6042 while (!kthread_should_stop()) {
1da177e4 6043
93588e22
N
6044 /* We need to wait INTERRUPTIBLE so that
6045 * we don't add to the load-average.
6046 * That means we need to be sure no signals are
6047 * pending
6048 */
6049 if (signal_pending(current))
6050 flush_signals(current);
6051
6052 wait_event_interruptible_timeout
6053 (thread->wqueue,
6054 test_bit(THREAD_WAKEUP, &thread->flags)
6055 || kthread_should_stop(),
6056 thread->timeout);
1da177e4 6057
6c987910
N
6058 clear_bit(THREAD_WAKEUP, &thread->flags);
6059 if (!kthread_should_stop())
589a594b 6060 thread->run(thread->mddev);
1da177e4 6061 }
a6fb0934 6062
1da177e4
LT
6063 return 0;
6064}
6065
6066void md_wakeup_thread(mdk_thread_t *thread)
6067{
6068 if (thread) {
6069 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
6070 set_bit(THREAD_WAKEUP, &thread->flags);
6071 wake_up(&thread->wqueue);
6072 }
6073}
6074
6075mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
6076 const char *name)
6077{
6078 mdk_thread_t *thread;
1da177e4 6079
9ffae0cf 6080 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT
6081 if (!thread)
6082 return NULL;
6083
1da177e4
LT
6084 init_waitqueue_head(&thread->wqueue);
6085
1da177e4
LT
6086 thread->run = run;
6087 thread->mddev = mddev;
32a7627c 6088 thread->timeout = MAX_SCHEDULE_TIMEOUT;
0da3c619
N
6089 thread->tsk = kthread_run(md_thread, thread,
6090 "%s_%s",
6091 mdname(thread->mddev),
6092 name ?: mddev->pers->name);
a6fb0934 6093 if (IS_ERR(thread->tsk)) {
1da177e4
LT
6094 kfree(thread);
6095 return NULL;
6096 }
1da177e4
LT
6097 return thread;
6098}
6099
1da177e4
LT
6100void md_unregister_thread(mdk_thread_t *thread)
6101{
e0cf8f04
N
6102 if (!thread)
6103 return;
ba25f9dc 6104 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
a6fb0934
N
6105
6106 kthread_stop(thread->tsk);
1da177e4
LT
6107 kfree(thread);
6108}
6109
6110void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
6111{
6112 if (!mddev) {
6113 MD_BUG();
6114 return;
6115 }
6116
b2d444d7 6117 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 6118 return;
6bfe0b49
DW
6119
6120 if (mddev->external)
6121 set_bit(Blocked, &rdev->flags);
32a7627c 6122/*
1da177e4
LT
6123 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6124 mdname(mddev),
6125 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6126 __builtin_return_address(0),__builtin_return_address(1),
6127 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 6128*/
d0a0a5ee
AM
6129 if (!mddev->pers)
6130 return;
1da177e4
LT
6131 if (!mddev->pers->error_handler)
6132 return;
6133 mddev->pers->error_handler(mddev,rdev);
72a23c21
NB
6134 if (mddev->degraded)
6135 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
00bcb4ac 6136 sysfs_notify_dirent_safe(rdev->sysfs_state);
1da177e4
LT
6137 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6138 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6139 md_wakeup_thread(mddev->thread);
768a418d 6140 if (mddev->event_work.func)
e804ac78 6141 queue_work(md_misc_wq, &mddev->event_work);
c331eb04 6142 md_new_event_inintr(mddev);
1da177e4
LT
6143}
6144
6145/* seq_file implementation /proc/mdstat */
6146
6147static void status_unused(struct seq_file *seq)
6148{
6149 int i = 0;
6150 mdk_rdev_t *rdev;
1da177e4
LT
6151
6152 seq_printf(seq, "unused devices: ");
6153
159ec1fc 6154 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
1da177e4
LT
6155 char b[BDEVNAME_SIZE];
6156 i++;
6157 seq_printf(seq, "%s ",
6158 bdevname(rdev->bdev,b));
6159 }
6160 if (!i)
6161 seq_printf(seq, "<none>");
6162
6163 seq_printf(seq, "\n");
6164}
6165
6166
6167static void status_resync(struct seq_file *seq, mddev_t * mddev)
6168{
dd71cf6b
N
6169 sector_t max_sectors, resync, res;
6170 unsigned long dt, db;
6171 sector_t rt;
4588b42e
N
6172 int scale;
6173 unsigned int per_milli;
1da177e4 6174
dd71cf6b 6175 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
1da177e4
LT
6176
6177 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
dd71cf6b 6178 max_sectors = mddev->resync_max_sectors;
1da177e4 6179 else
dd71cf6b 6180 max_sectors = mddev->dev_sectors;
1da177e4
LT
6181
6182 /*
6183 * Should not happen.
6184 */
dd71cf6b 6185 if (!max_sectors) {
1da177e4
LT
6186 MD_BUG();
6187 return;
6188 }
4588b42e 6189 /* Pick 'scale' such that (resync>>scale)*1000 will fit
dd71cf6b 6190 * in a sector_t, and (max_sectors>>scale) will fit in a
4588b42e
N
6191 * u32, as those are the requirements for sector_div.
6192 * Thus 'scale' must be at least 10
6193 */
6194 scale = 10;
6195 if (sizeof(sector_t) > sizeof(unsigned long)) {
dd71cf6b 6196 while ( max_sectors/2 > (1ULL<<(scale+32)))
4588b42e
N
6197 scale++;
6198 }
6199 res = (resync>>scale)*1000;
dd71cf6b 6200 sector_div(res, (u32)((max_sectors>>scale)+1));
4588b42e
N
6201
6202 per_milli = res;
1da177e4 6203 {
4588b42e 6204 int i, x = per_milli/50, y = 20-x;
1da177e4
LT
6205 seq_printf(seq, "[");
6206 for (i = 0; i < x; i++)
6207 seq_printf(seq, "=");
6208 seq_printf(seq, ">");
6209 for (i = 0; i < y; i++)
6210 seq_printf(seq, ".");
6211 seq_printf(seq, "] ");
6212 }
4588b42e 6213 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
ccfcc3c1
N
6214 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6215 "reshape" :
61df9d91
N
6216 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6217 "check" :
6218 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6219 "resync" : "recovery"))),
6220 per_milli/10, per_milli % 10,
dd71cf6b
N
6221 (unsigned long long) resync/2,
6222 (unsigned long long) max_sectors/2);
1da177e4
LT
6223
6224 /*
1da177e4
LT
6225 * dt: time from mark until now
6226 * db: blocks written from mark until now
6227 * rt: remaining time
dd71cf6b
N
6228 *
6229 * rt is a sector_t, so could be 32bit or 64bit.
6230 * So we divide before multiply in case it is 32bit and close
6231 * to the limit.
6232 * We scale the divisor (db) by 32 to avoid loosing precision
6233 * near the end of resync when the number of remaining sectors
6234 * is close to 'db'.
6235 * We then divide rt by 32 after multiplying by db to compensate.
6236 * The '+1' avoids division by zero if db is very small.
1da177e4
LT
6237 */
6238 dt = ((jiffies - mddev->resync_mark) / HZ);
6239 if (!dt) dt++;
ff4e8d9a
N
6240 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6241 - mddev->resync_mark_cnt;
1da177e4 6242
dd71cf6b
N
6243 rt = max_sectors - resync; /* number of remaining sectors */
6244 sector_div(rt, db/32+1);
6245 rt *= dt;
6246 rt >>= 5;
6247
6248 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6249 ((unsigned long)rt % 60)/6);
1da177e4 6250
ff4e8d9a 6251 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
1da177e4
LT
6252}
6253
6254static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6255{
6256 struct list_head *tmp;
6257 loff_t l = *pos;
6258 mddev_t *mddev;
6259
6260 if (l >= 0x10000)
6261 return NULL;
6262 if (!l--)
6263 /* header */
6264 return (void*)1;
6265
6266 spin_lock(&all_mddevs_lock);
6267 list_for_each(tmp,&all_mddevs)
6268 if (!l--) {
6269 mddev = list_entry(tmp, mddev_t, all_mddevs);
6270 mddev_get(mddev);
6271 spin_unlock(&all_mddevs_lock);
6272 return mddev;
6273 }
6274 spin_unlock(&all_mddevs_lock);
6275 if (!l--)
6276 return (void*)2;/* tail */
6277 return NULL;
6278}
6279
6280static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6281{
6282 struct list_head *tmp;
6283 mddev_t *next_mddev, *mddev = v;
6284
6285 ++*pos;
6286 if (v == (void*)2)
6287 return NULL;
6288
6289 spin_lock(&all_mddevs_lock);
6290 if (v == (void*)1)
6291 tmp = all_mddevs.next;
6292 else
6293 tmp = mddev->all_mddevs.next;
6294 if (tmp != &all_mddevs)
6295 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
6296 else {
6297 next_mddev = (void*)2;
6298 *pos = 0x10000;
6299 }
6300 spin_unlock(&all_mddevs_lock);
6301
6302 if (v != (void*)1)
6303 mddev_put(mddev);
6304 return next_mddev;
6305
6306}
6307
6308static void md_seq_stop(struct seq_file *seq, void *v)
6309{
6310 mddev_t *mddev = v;
6311
6312 if (mddev && v != (void*)1 && v != (void*)2)
6313 mddev_put(mddev);
6314}
6315
d7603b7e
N
6316struct mdstat_info {
6317 int event;
6318};
6319
1da177e4
LT
6320static int md_seq_show(struct seq_file *seq, void *v)
6321{
6322 mddev_t *mddev = v;
dd8ac336 6323 sector_t sectors;
1da177e4 6324 mdk_rdev_t *rdev;
d7603b7e 6325 struct mdstat_info *mi = seq->private;
32a7627c 6326 struct bitmap *bitmap;
1da177e4
LT
6327
6328 if (v == (void*)1) {
2604b703 6329 struct mdk_personality *pers;
1da177e4
LT
6330 seq_printf(seq, "Personalities : ");
6331 spin_lock(&pers_lock);
2604b703
N
6332 list_for_each_entry(pers, &pers_list, list)
6333 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT
6334
6335 spin_unlock(&pers_lock);
6336 seq_printf(seq, "\n");
d7603b7e 6337 mi->event = atomic_read(&md_event_count);
1da177e4
LT
6338 return 0;
6339 }
6340 if (v == (void*)2) {
6341 status_unused(seq);
6342 return 0;
6343 }
6344
5dc5cf7d 6345 if (mddev_lock(mddev) < 0)
1da177e4 6346 return -EINTR;
5dc5cf7d 6347
1da177e4
LT
6348 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
6349 seq_printf(seq, "%s : %sactive", mdname(mddev),
6350 mddev->pers ? "" : "in");
6351 if (mddev->pers) {
f91de92e 6352 if (mddev->ro==1)
1da177e4 6353 seq_printf(seq, " (read-only)");
f91de92e 6354 if (mddev->ro==2)
52720ae7 6355 seq_printf(seq, " (auto-read-only)");
1da177e4
LT
6356 seq_printf(seq, " %s", mddev->pers->name);
6357 }
6358
dd8ac336 6359 sectors = 0;
159ec1fc 6360 list_for_each_entry(rdev, &mddev->disks, same_set) {
1da177e4
LT
6361 char b[BDEVNAME_SIZE];
6362 seq_printf(seq, " %s[%d]",
6363 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N
6364 if (test_bit(WriteMostly, &rdev->flags))
6365 seq_printf(seq, "(W)");
b2d444d7 6366 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT
6367 seq_printf(seq, "(F)");
6368 continue;
b325a32e
N
6369 } else if (rdev->raid_disk < 0)
6370 seq_printf(seq, "(S)"); /* spare */
dd8ac336 6371 sectors += rdev->sectors;
1da177e4
LT
6372 }
6373
6374 if (!list_empty(&mddev->disks)) {
6375 if (mddev->pers)
6376 seq_printf(seq, "\n %llu blocks",
f233ea5c
AN
6377 (unsigned long long)
6378 mddev->array_sectors / 2);
1da177e4
LT
6379 else
6380 seq_printf(seq, "\n %llu blocks",
dd8ac336 6381 (unsigned long long)sectors / 2);
1da177e4 6382 }
1cd6bf19
N
6383 if (mddev->persistent) {
6384 if (mddev->major_version != 0 ||
6385 mddev->minor_version != 90) {
6386 seq_printf(seq," super %d.%d",
6387 mddev->major_version,
6388 mddev->minor_version);
6389 }
e691063a
N
6390 } else if (mddev->external)
6391 seq_printf(seq, " super external:%s",
6392 mddev->metadata_type);
6393 else
1cd6bf19 6394 seq_printf(seq, " super non-persistent");
1da177e4
LT
6395
6396 if (mddev->pers) {
d710e138 6397 mddev->pers->status(seq, mddev);
1da177e4 6398 seq_printf(seq, "\n ");
8e1b39d6
N
6399 if (mddev->pers->sync_request) {
6400 if (mddev->curr_resync > 2) {
d710e138 6401 status_resync(seq, mddev);
8e1b39d6
N
6402 seq_printf(seq, "\n ");
6403 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
6404 seq_printf(seq, "\tresync=DELAYED\n ");
6405 else if (mddev->recovery_cp < MaxSector)
6406 seq_printf(seq, "\tresync=PENDING\n ");
6407 }
32a7627c
N
6408 } else
6409 seq_printf(seq, "\n ");
6410
6411 if ((bitmap = mddev->bitmap)) {
32a7627c
N
6412 unsigned long chunk_kb;
6413 unsigned long flags;
32a7627c 6414 spin_lock_irqsave(&bitmap->lock, flags);
42a04b50 6415 chunk_kb = mddev->bitmap_info.chunksize >> 10;
32a7627c
N
6416 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
6417 "%lu%s chunk",
6418 bitmap->pages - bitmap->missing_pages,
6419 bitmap->pages,
6420 (bitmap->pages - bitmap->missing_pages)
6421 << (PAGE_SHIFT - 10),
42a04b50 6422 chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize,
32a7627c 6423 chunk_kb ? "KB" : "B");
78d742d8
N
6424 if (bitmap->file) {
6425 seq_printf(seq, ", file: ");
c32c2f63 6426 seq_path(seq, &bitmap->file->f_path, " \t\n");
32a7627c 6427 }
78d742d8 6428
32a7627c
N
6429 seq_printf(seq, "\n");
6430 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT
6431 }
6432
6433 seq_printf(seq, "\n");
6434 }
6435 mddev_unlock(mddev);
6436
6437 return 0;
6438}
6439
110518bc 6440static const struct seq_operations md_seq_ops = {
1da177e4
LT
6441 .start = md_seq_start,
6442 .next = md_seq_next,
6443 .stop = md_seq_stop,
6444 .show = md_seq_show,
6445};
6446
6447static int md_seq_open(struct inode *inode, struct file *file)
6448{
6449 int error;
d7603b7e
N
6450 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
6451 if (mi == NULL)
6452 return -ENOMEM;
1da177e4
LT
6453
6454 error = seq_open(file, &md_seq_ops);
d7603b7e
N
6455 if (error)
6456 kfree(mi);
6457 else {
6458 struct seq_file *p = file->private_data;
6459 p->private = mi;
6460 mi->event = atomic_read(&md_event_count);
6461 }
1da177e4
LT
6462 return error;
6463}
6464
d7603b7e
N
6465static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6466{
6467 struct seq_file *m = filp->private_data;
6468 struct mdstat_info *mi = m->private;
6469 int mask;
6470
6471 poll_wait(filp, &md_event_waiters, wait);
6472
6473 /* always allow read */
6474 mask = POLLIN | POLLRDNORM;
6475
6476 if (mi->event != atomic_read(&md_event_count))
6477 mask |= POLLERR | POLLPRI;
6478 return mask;
6479}
6480
fa027c2a 6481static const struct file_operations md_seq_fops = {
e24650c2 6482 .owner = THIS_MODULE,
1da177e4
LT
6483 .open = md_seq_open,
6484 .read = seq_read,
6485 .llseek = seq_lseek,
c3f94b40 6486 .release = seq_release_private,
d7603b7e 6487 .poll = mdstat_poll,
1da177e4
LT
6488};
6489
2604b703 6490int register_md_personality(struct mdk_personality *p)
1da177e4 6491{
1da177e4 6492 spin_lock(&pers_lock);
2604b703
N
6493 list_add_tail(&p->list, &pers_list);
6494 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
1da177e4
LT
6495 spin_unlock(&pers_lock);
6496 return 0;
6497}
6498
2604b703 6499int unregister_md_personality(struct mdk_personality *p)
1da177e4 6500{
2604b703 6501 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 6502 spin_lock(&pers_lock);
2604b703 6503 list_del_init(&p->list);
1da177e4
LT
6504 spin_unlock(&pers_lock);
6505 return 0;
6506}
6507
eea1bf38 6508static int is_mddev_idle(mddev_t *mddev, int init)
1da177e4
LT
6509{
6510 mdk_rdev_t * rdev;
1da177e4 6511 int idle;
eea1bf38 6512 int curr_events;
1da177e4
LT
6513
6514 idle = 1;
4b80991c
N
6515 rcu_read_lock();
6516 rdev_for_each_rcu(rdev, mddev) {
1da177e4 6517 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
eea1bf38
N
6518 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6519 (int)part_stat_read(&disk->part0, sectors[1]) -
6520 atomic_read(&disk->sync_io);
713f6ab1
N
6521 /* sync IO will cause sync_io to increase before the disk_stats
6522 * as sync_io is counted when a request starts, and
6523 * disk_stats is counted when it completes.
6524 * So resync activity will cause curr_events to be smaller than
6525 * when there was no such activity.
6526 * non-sync IO will cause disk_stat to increase without
6527 * increasing sync_io so curr_events will (eventually)
6528 * be larger than it was before. Once it becomes
6529 * substantially larger, the test below will cause
6530 * the array to appear non-idle, and resync will slow
6531 * down.
6532 * If there is a lot of outstanding resync activity when
6533 * we set last_event to curr_events, then all that activity
6534 * completing might cause the array to appear non-idle
6535 * and resync will be slowed down even though there might
6536 * not have been non-resync activity. This will only
6537 * happen once though. 'last_events' will soon reflect
6538 * the state where there is little or no outstanding
6539 * resync requests, and further resync activity will
6540 * always make curr_events less than last_events.
c0e48521 6541 *
1da177e4 6542 */
eea1bf38 6543 if (init || curr_events - rdev->last_events > 64) {
1da177e4
LT
6544 rdev->last_events = curr_events;
6545 idle = 0;
6546 }
6547 }
4b80991c 6548 rcu_read_unlock();
1da177e4
LT
6549 return idle;
6550}
6551
6552void md_done_sync(mddev_t *mddev, int blocks, int ok)
6553{
6554 /* another "blocks" (512byte) blocks have been synced */
6555 atomic_sub(blocks, &mddev->recovery_active);
6556 wake_up(&mddev->recovery_wait);
6557 if (!ok) {
dfc70645 6558 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT
6559 md_wakeup_thread(mddev->thread);
6560 // stop recovery, signal do_sync ....
6561 }
6562}
6563
6564
06d91a5f
N
6565/* md_write_start(mddev, bi)
6566 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N
6567 * in superblock) before writing, schedule a superblock update
6568 * and wait for it to complete.
06d91a5f 6569 */
3d310eb7 6570void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 6571{
0fd62b86 6572 int did_change = 0;
06d91a5f 6573 if (bio_data_dir(bi) != WRITE)
3d310eb7 6574 return;
06d91a5f 6575
f91de92e
N
6576 BUG_ON(mddev->ro == 1);
6577 if (mddev->ro == 2) {
6578 /* need to switch to read/write */
6579 mddev->ro = 0;
6580 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6581 md_wakeup_thread(mddev->thread);
25156198 6582 md_wakeup_thread(mddev->sync_thread);
0fd62b86 6583 did_change = 1;
f91de92e 6584 }
06d91a5f 6585 atomic_inc(&mddev->writes_pending);
31a59e34
N
6586 if (mddev->safemode == 1)
6587 mddev->safemode = 0;
06d91a5f 6588 if (mddev->in_sync) {
a9701a30 6589 spin_lock_irq(&mddev->write_lock);
3d310eb7
N
6590 if (mddev->in_sync) {
6591 mddev->in_sync = 0;
850b2b42 6592 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
070dc6dd 6593 set_bit(MD_CHANGE_PENDING, &mddev->flags);
3d310eb7 6594 md_wakeup_thread(mddev->thread);
0fd62b86 6595 did_change = 1;
3d310eb7 6596 }
a9701a30 6597 spin_unlock_irq(&mddev->write_lock);
06d91a5f 6598 }
0fd62b86 6599 if (did_change)
00bcb4ac 6600 sysfs_notify_dirent_safe(mddev->sysfs_state);
09a44cc1 6601 wait_event(mddev->sb_wait,
09a44cc1 6602 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
1da177e4
LT
6603}
6604
6605void md_write_end(mddev_t *mddev)
6606{
6607 if (atomic_dec_and_test(&mddev->writes_pending)) {
6608 if (mddev->safemode == 2)
6609 md_wakeup_thread(mddev->thread);
16f17b39 6610 else if (mddev->safemode_delay)
1da177e4
LT
6611 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6612 }
6613}
6614
2a2275d6
N
6615/* md_allow_write(mddev)
6616 * Calling this ensures that the array is marked 'active' so that writes
6617 * may proceed without blocking. It is important to call this before
6618 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6619 * Must be called with mddev_lock held.
b5470dc5
DW
6620 *
6621 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6622 * is dropped, so return -EAGAIN after notifying userspace.
2a2275d6 6623 */
b5470dc5 6624int md_allow_write(mddev_t *mddev)
2a2275d6
N
6625{
6626 if (!mddev->pers)
b5470dc5 6627 return 0;
2a2275d6 6628 if (mddev->ro)
b5470dc5 6629 return 0;
1a0fd497 6630 if (!mddev->pers->sync_request)
b5470dc5 6631 return 0;
2a2275d6
N
6632
6633 spin_lock_irq(&mddev->write_lock);
6634 if (mddev->in_sync) {
6635 mddev->in_sync = 0;
6636 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
070dc6dd 6637 set_bit(MD_CHANGE_PENDING, &mddev->flags);
2a2275d6
N
6638 if (mddev->safemode_delay &&
6639 mddev->safemode == 0)
6640 mddev->safemode = 1;
6641 spin_unlock_irq(&mddev->write_lock);
6642 md_update_sb(mddev, 0);
00bcb4ac 6643 sysfs_notify_dirent_safe(mddev->sysfs_state);
2a2275d6
N
6644 } else
6645 spin_unlock_irq(&mddev->write_lock);
b5470dc5 6646
070dc6dd 6647 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
b5470dc5
DW
6648 return -EAGAIN;
6649 else
6650 return 0;
2a2275d6
N
6651}
6652EXPORT_SYMBOL_GPL(md_allow_write);
6653
b63d7c2e 6654void md_unplug(mddev_t *mddev)
252ac522
N
6655{
6656 if (mddev->queue)
6657 blk_unplug(mddev->queue);
6658 if (mddev->plug)
6659 mddev->plug->unplug_fn(mddev->plug);
6660}
6661
1da177e4
LT
6662#define SYNC_MARKS 10
6663#define SYNC_MARK_STEP (3*HZ)
29269553 6664void md_do_sync(mddev_t *mddev)
1da177e4
LT
6665{
6666 mddev_t *mddev2;
6667 unsigned int currspeed = 0,
6668 window;
57afd89f 6669 sector_t max_sectors,j, io_sectors;
1da177e4
LT
6670 unsigned long mark[SYNC_MARKS];
6671 sector_t mark_cnt[SYNC_MARKS];
6672 int last_mark,m;
6673 struct list_head *tmp;
6674 sector_t last_check;
57afd89f 6675 int skipped = 0;
5fd6c1dc 6676 mdk_rdev_t *rdev;
61df9d91 6677 char *desc;
1da177e4
LT
6678
6679 /* just incase thread restarts... */
6680 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6681 return;
5fd6c1dc
N
6682 if (mddev->ro) /* never try to sync a read-only array */
6683 return;
1da177e4 6684
61df9d91
N
6685 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6686 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6687 desc = "data-check";
6688 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6689 desc = "requested-resync";
6690 else
6691 desc = "resync";
6692 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6693 desc = "reshape";
6694 else
6695 desc = "recovery";
6696
1da177e4
LT
6697 /* we overload curr_resync somewhat here.
6698 * 0 == not engaged in resync at all
6699 * 2 == checking that there is no conflict with another sync
6700 * 1 == like 2, but have yielded to allow conflicting resync to
6701 * commense
6702 * other == active in resync - this many blocks
6703 *
6704 * Before starting a resync we must have set curr_resync to
6705 * 2, and then checked that every "conflicting" array has curr_resync
6706 * less than ours. When we find one that is the same or higher
6707 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6708 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6709 * This will mean we have to start checking from the beginning again.
6710 *
6711 */
6712
6713 do {
6714 mddev->curr_resync = 2;
6715
6716 try_again:
404e4b43 6717 if (kthread_should_stop())
6985c43f 6718 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
404e4b43
N
6719
6720 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
1da177e4 6721 goto skip;
29ac4aa3 6722 for_each_mddev(mddev2, tmp) {
1da177e4
LT
6723 if (mddev2 == mddev)
6724 continue;
90b08710
BS
6725 if (!mddev->parallel_resync
6726 && mddev2->curr_resync
6727 && match_mddev_units(mddev, mddev2)) {
1da177e4
LT
6728 DEFINE_WAIT(wq);
6729 if (mddev < mddev2 && mddev->curr_resync == 2) {
6730 /* arbitrarily yield */
6731 mddev->curr_resync = 1;
6732 wake_up(&resync_wait);
6733 }
6734 if (mddev > mddev2 && mddev->curr_resync == 1)
6735 /* no need to wait here, we can wait the next
6736 * time 'round when curr_resync == 2
6737 */
6738 continue;
9744197c
N
6739 /* We need to wait 'interruptible' so as not to
6740 * contribute to the load average, and not to
6741 * be caught by 'softlockup'
6742 */
6743 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
787453c2 6744 if (!kthread_should_stop() &&
8712e553 6745 mddev2->curr_resync >= mddev->curr_resync) {
61df9d91
N
6746 printk(KERN_INFO "md: delaying %s of %s"
6747 " until %s has finished (they"
1da177e4 6748 " share one or more physical units)\n",
61df9d91 6749 desc, mdname(mddev), mdname(mddev2));
1da177e4 6750 mddev_put(mddev2);
9744197c
N
6751 if (signal_pending(current))
6752 flush_signals(current);
1da177e4
LT
6753 schedule();
6754 finish_wait(&resync_wait, &wq);
6755 goto try_again;
6756 }
6757 finish_wait(&resync_wait, &wq);
6758 }
6759 }
6760 } while (mddev->curr_resync < 2);
6761
5fd6c1dc 6762 j = 0;
9d88883e 6763 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 6764 /* resync follows the size requested by the personality,
57afd89f 6765 * which defaults to physical size, but can be virtual size
1da177e4
LT
6766 */
6767 max_sectors = mddev->resync_max_sectors;
9d88883e 6768 mddev->resync_mismatches = 0;
5fd6c1dc 6769 /* we don't use the checkpoint if there's a bitmap */
5e96ee65
NB
6770 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6771 j = mddev->resync_min;
6772 else if (!mddev->bitmap)
5fd6c1dc 6773 j = mddev->recovery_cp;
5e96ee65 6774
ccfcc3c1 6775 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
58c0fed4 6776 max_sectors = mddev->dev_sectors;
5fd6c1dc 6777 else {
1da177e4 6778 /* recovery follows the physical size of devices */
58c0fed4 6779 max_sectors = mddev->dev_sectors;
5fd6c1dc 6780 j = MaxSector;
4e59ca7d
DW
6781 rcu_read_lock();
6782 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
5fd6c1dc
N
6783 if (rdev->raid_disk >= 0 &&
6784 !test_bit(Faulty, &rdev->flags) &&
6785 !test_bit(In_sync, &rdev->flags) &&
6786 rdev->recovery_offset < j)
6787 j = rdev->recovery_offset;
4e59ca7d 6788 rcu_read_unlock();
5fd6c1dc 6789 }
1da177e4 6790
61df9d91
N
6791 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6792 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6793 " %d KB/sec/disk.\n", speed_min(mddev));
338cec32 6794 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
61df9d91
N
6795 "(but not more than %d KB/sec) for %s.\n",
6796 speed_max(mddev), desc);
1da177e4 6797
eea1bf38 6798 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
5fd6c1dc 6799
57afd89f 6800 io_sectors = 0;
1da177e4
LT
6801 for (m = 0; m < SYNC_MARKS; m++) {
6802 mark[m] = jiffies;
57afd89f 6803 mark_cnt[m] = io_sectors;
1da177e4
LT
6804 }
6805 last_mark = 0;
6806 mddev->resync_mark = mark[last_mark];
6807 mddev->resync_mark_cnt = mark_cnt[last_mark];
6808
6809 /*
6810 * Tune reconstruction:
6811 */
6812 window = 32*(PAGE_SIZE/512);
6813 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
6814 window/2,(unsigned long long) max_sectors/2);
6815
6816 atomic_set(&mddev->recovery_active, 0);
1da177e4
LT
6817 last_check = 0;
6818
6819 if (j>2) {
6820 printk(KERN_INFO
61df9d91
N
6821 "md: resuming %s of %s from checkpoint.\n",
6822 desc, mdname(mddev));
1da177e4
LT
6823 mddev->curr_resync = j;
6824 }
efa59339 6825 mddev->curr_resync_completed = mddev->curr_resync;
1da177e4
LT
6826
6827 while (j < max_sectors) {
57afd89f 6828 sector_t sectors;
1da177e4 6829
57afd89f 6830 skipped = 0;
97e4f42d 6831
7a91ee1f
N
6832 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6833 ((mddev->curr_resync > mddev->curr_resync_completed &&
6834 (mddev->curr_resync - mddev->curr_resync_completed)
6835 > (max_sectors >> 4)) ||
6836 (j - mddev->curr_resync_completed)*2
6837 >= mddev->resync_max - mddev->curr_resync_completed
6838 )) {
97e4f42d 6839 /* time to update curr_resync_completed */
252ac522 6840 md_unplug(mddev);
97e4f42d
N
6841 wait_event(mddev->recovery_wait,
6842 atomic_read(&mddev->recovery_active) == 0);
6843 mddev->curr_resync_completed =
6844 mddev->curr_resync;
070dc6dd 6845 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
acb180b0 6846 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
97e4f42d 6847 }
acb180b0 6848
e62e58a5
N
6849 while (j >= mddev->resync_max && !kthread_should_stop()) {
6850 /* As this condition is controlled by user-space,
6851 * we can block indefinitely, so use '_interruptible'
6852 * to avoid triggering warnings.
6853 */
6854 flush_signals(current); /* just in case */
6855 wait_event_interruptible(mddev->recovery_wait,
6856 mddev->resync_max > j
6857 || kthread_should_stop());
6858 }
acb180b0
N
6859
6860 if (kthread_should_stop())
6861 goto interrupted;
6862
57afd89f 6863 sectors = mddev->pers->sync_request(mddev, j, &skipped,
c6207277 6864 currspeed < speed_min(mddev));
57afd89f 6865 if (sectors == 0) {
dfc70645 6866 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT
6867 goto out;
6868 }
57afd89f
N
6869
6870 if (!skipped) { /* actual IO requested */
6871 io_sectors += sectors;
6872 atomic_add(sectors, &mddev->recovery_active);
6873 }
6874
1da177e4
LT
6875 j += sectors;
6876 if (j>1) mddev->curr_resync = j;
ff4e8d9a 6877 mddev->curr_mark_cnt = io_sectors;
d7603b7e
N
6878 if (last_check == 0)
6879 /* this is the earliers that rebuilt will be
6880 * visible in /proc/mdstat
6881 */
6882 md_new_event(mddev);
57afd89f
N
6883
6884 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT
6885 continue;
6886
57afd89f 6887 last_check = io_sectors;
1da177e4 6888
dfc70645 6889 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
1da177e4
LT
6890 break;
6891
6892 repeat:
6893 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6894 /* step marks */
6895 int next = (last_mark+1) % SYNC_MARKS;
6896
6897 mddev->resync_mark = mark[next];
6898 mddev->resync_mark_cnt = mark_cnt[next];
6899 mark[next] = jiffies;
57afd89f 6900 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT
6901 last_mark = next;
6902 }
6903
6904
c6207277
N
6905 if (kthread_should_stop())
6906 goto interrupted;
6907
1da177e4
LT
6908
6909 /*
6910 * this loop exits only if either when we are slower than
6911 * the 'hard' speed limit, or the system was IO-idle for
6912 * a jiffy.
6913 * the system might be non-idle CPU-wise, but we only care
6914 * about not overloading the IO subsystem. (things like an
6915 * e2fsck being done on the RAID array should execute fast)
6916 */
252ac522 6917 md_unplug(mddev);
1da177e4
LT
6918 cond_resched();
6919
57afd89f
N
6920 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6921 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4 6922
88202a0c
N
6923 if (currspeed > speed_min(mddev)) {
6924 if ((currspeed > speed_max(mddev)) ||
eea1bf38 6925 !is_mddev_idle(mddev, 0)) {
c0e48521 6926 msleep(500);
1da177e4
LT
6927 goto repeat;
6928 }
6929 }
6930 }
61df9d91 6931 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
1da177e4
LT
6932 /*
6933 * this also signals 'finished resyncing' to md_stop
6934 */
6935 out:
252ac522 6936 md_unplug(mddev);
1da177e4
LT
6937
6938 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6939
6940 /* tell personality that we are finished */
57afd89f 6941 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4 6942
dfc70645 6943 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5fd6c1dc
N
6944 mddev->curr_resync > 2) {
6945 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6946 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6947 if (mddev->curr_resync >= mddev->recovery_cp) {
6948 printk(KERN_INFO
61df9d91
N
6949 "md: checkpointing %s of %s.\n",
6950 desc, mdname(mddev));
5fd6c1dc
N
6951 mddev->recovery_cp = mddev->curr_resync;
6952 }
6953 } else
6954 mddev->recovery_cp = MaxSector;
6955 } else {
6956 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6957 mddev->curr_resync = MaxSector;
4e59ca7d
DW
6958 rcu_read_lock();
6959 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
5fd6c1dc 6960 if (rdev->raid_disk >= 0 &&
70fffd0b 6961 mddev->delta_disks >= 0 &&
5fd6c1dc
N
6962 !test_bit(Faulty, &rdev->flags) &&
6963 !test_bit(In_sync, &rdev->flags) &&
6964 rdev->recovery_offset < mddev->curr_resync)
6965 rdev->recovery_offset = mddev->curr_resync;
4e59ca7d 6966 rcu_read_unlock();
5fd6c1dc 6967 }
1da177e4 6968 }
17571284 6969 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 6970
1da177e4 6971 skip:
c07b70ad
N
6972 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6973 /* We completed so min/max setting can be forgotten if used. */
6974 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6975 mddev->resync_min = 0;
6976 mddev->resync_max = MaxSector;
6977 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6978 mddev->resync_min = mddev->curr_resync_completed;
1da177e4 6979 mddev->curr_resync = 0;
efa59339
N
6980 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6981 mddev->curr_resync_completed = 0;
c6207277 6982 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
1da177e4
LT
6983 wake_up(&resync_wait);
6984 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6985 md_wakeup_thread(mddev->thread);
c6207277
N
6986 return;
6987
6988 interrupted:
6989 /*
6990 * got a signal, exit.
6991 */
6992 printk(KERN_INFO
6993 "md: md_do_sync() got signal ... exiting\n");
6994 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6995 goto out;
6996
1da177e4 6997}
29269553 6998EXPORT_SYMBOL_GPL(md_do_sync);
1da177e4
LT
6999
7000
b4c4c7b8
N
7001static int remove_and_add_spares(mddev_t *mddev)
7002{
7003 mdk_rdev_t *rdev;
b4c4c7b8
N
7004 int spares = 0;
7005
97e4f42d
N
7006 mddev->curr_resync_completed = 0;
7007
159ec1fc 7008 list_for_each_entry(rdev, &mddev->disks, same_set)
b4c4c7b8 7009 if (rdev->raid_disk >= 0 &&
6bfe0b49 7010 !test_bit(Blocked, &rdev->flags) &&
b4c4c7b8
N
7011 (test_bit(Faulty, &rdev->flags) ||
7012 ! test_bit(In_sync, &rdev->flags)) &&
7013 atomic_read(&rdev->nr_pending)==0) {
7014 if (mddev->pers->hot_remove_disk(
7015 mddev, rdev->raid_disk)==0) {
7016 char nm[20];
7017 sprintf(nm,"rd%d", rdev->raid_disk);
7018 sysfs_remove_link(&mddev->kobj, nm);
7019 rdev->raid_disk = -1;
7020 }
7021 }
7022
4044ba58 7023 if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) {
159ec1fc 7024 list_for_each_entry(rdev, &mddev->disks, same_set) {
dfc70645 7025 if (rdev->raid_disk >= 0 &&
e5427135
DW
7026 !test_bit(In_sync, &rdev->flags) &&
7027 !test_bit(Blocked, &rdev->flags))
dfc70645 7028 spares++;
b4c4c7b8
N
7029 if (rdev->raid_disk < 0
7030 && !test_bit(Faulty, &rdev->flags)) {
7031 rdev->recovery_offset = 0;
199050ea
NB
7032 if (mddev->pers->
7033 hot_add_disk(mddev, rdev) == 0) {
b4c4c7b8
N
7034 char nm[20];
7035 sprintf(nm, "rd%d", rdev->raid_disk);
5e55e2f5
N
7036 if (sysfs_create_link(&mddev->kobj,
7037 &rdev->kobj, nm))
00bcb4ac 7038 /* failure here is OK */;
b4c4c7b8
N
7039 spares++;
7040 md_new_event(mddev);
93be75ff 7041 set_bit(MD_CHANGE_DEVS, &mddev->flags);
b4c4c7b8
N
7042 } else
7043 break;
7044 }
dfc70645 7045 }
b4c4c7b8
N
7046 }
7047 return spares;
7048}
7ebc0be7
N
7049
7050static void reap_sync_thread(mddev_t *mddev)
7051{
7052 mdk_rdev_t *rdev;
7053
7054 /* resync has finished, collect result */
7055 md_unregister_thread(mddev->sync_thread);
7056 mddev->sync_thread = NULL;
7057 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7058 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7059 /* success...*/
7060 /* activate any spares */
7061 if (mddev->pers->spare_active(mddev))
7062 sysfs_notify(&mddev->kobj, NULL,
7063 "degraded");
7064 }
7065 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7066 mddev->pers->finish_reshape)
7067 mddev->pers->finish_reshape(mddev);
7068 md_update_sb(mddev, 1);
7069
7070 /* if array is no-longer degraded, then any saved_raid_disk
7071 * information must be scrapped
7072 */
7073 if (!mddev->degraded)
7074 list_for_each_entry(rdev, &mddev->disks, same_set)
7075 rdev->saved_raid_disk = -1;
7076
7077 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7078 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7079 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7080 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7081 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7082 /* flag recovery needed just to double check */
7083 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7084 sysfs_notify_dirent_safe(mddev->sysfs_action);
7085 md_new_event(mddev);
7086}
7087
1da177e4
LT
7088/*
7089 * This routine is regularly called by all per-raid-array threads to
7090 * deal with generic issues like resync and super-block update.
7091 * Raid personalities that don't have a thread (linear/raid0) do not
7092 * need this as they never do any recovery or update the superblock.
7093 *
7094 * It does not do any resync itself, but rather "forks" off other threads
7095 * to do that as needed.
7096 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7097 * "->recovery" and create a thread at ->sync_thread.
dfc70645 7098 * When the thread finishes it sets MD_RECOVERY_DONE
1da177e4
LT
7099 * and wakeups up this thread which will reap the thread and finish up.
7100 * This thread also removes any faulty devices (with nr_pending == 0).
7101 *
7102 * The overall approach is:
7103 * 1/ if the superblock needs updating, update it.
7104 * 2/ If a recovery thread is running, don't do anything else.
7105 * 3/ If recovery has finished, clean up, possibly marking spares active.
7106 * 4/ If there are any faulty devices, remove them.
7107 * 5/ If array is degraded, try to add spares devices
7108 * 6/ If array has spares or is not in-sync, start a resync thread.
7109 */
7110void md_check_recovery(mddev_t *mddev)
7111{
5f40402d 7112 if (mddev->bitmap)
aa5cbd10 7113 bitmap_daemon_work(mddev);
1da177e4
LT
7114
7115 if (mddev->ro)
7116 return;
fca4d848
N
7117
7118 if (signal_pending(current)) {
31a59e34 7119 if (mddev->pers->sync_request && !mddev->external) {
fca4d848
N
7120 printk(KERN_INFO "md: %s in immediate safe mode\n",
7121 mdname(mddev));
7122 mddev->safemode = 2;
7123 }
7124 flush_signals(current);
7125 }
7126
c89a8eee
N
7127 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
7128 return;
1da177e4 7129 if ( ! (
126925c0 7130 (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) ||
1da177e4 7131 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848 7132 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
31a59e34 7133 (mddev->external == 0 && mddev->safemode == 1) ||
fca4d848
N
7134 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
7135 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT
7136 ))
7137 return;
fca4d848 7138
df5b89b3 7139 if (mddev_trylock(mddev)) {
b4c4c7b8 7140 int spares = 0;
fca4d848 7141
c89a8eee
N
7142 if (mddev->ro) {
7143 /* Only thing we do on a ro array is remove
7144 * failed devices.
7145 */
7146 remove_and_add_spares(mddev);
7147 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7148 goto unlock;
7149 }
7150
31a59e34 7151 if (!mddev->external) {
0fd62b86 7152 int did_change = 0;
31a59e34
N
7153 spin_lock_irq(&mddev->write_lock);
7154 if (mddev->safemode &&
7155 !atomic_read(&mddev->writes_pending) &&
7156 !mddev->in_sync &&
7157 mddev->recovery_cp == MaxSector) {
7158 mddev->in_sync = 1;
0fd62b86 7159 did_change = 1;
070dc6dd 7160 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
31a59e34
N
7161 }
7162 if (mddev->safemode == 1)
7163 mddev->safemode = 0;
7164 spin_unlock_irq(&mddev->write_lock);
0fd62b86 7165 if (did_change)
00bcb4ac 7166 sysfs_notify_dirent_safe(mddev->sysfs_state);
fca4d848 7167 }
fca4d848 7168
850b2b42
N
7169 if (mddev->flags)
7170 md_update_sb(mddev, 0);
06d91a5f 7171
1da177e4
LT
7172 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7173 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7174 /* resync/recovery still happening */
7175 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7176 goto unlock;
7177 }
7178 if (mddev->sync_thread) {
7ebc0be7 7179 reap_sync_thread(mddev);
1da177e4
LT
7180 goto unlock;
7181 }
72a23c21
NB
7182 /* Set RUNNING before clearing NEEDED to avoid
7183 * any transients in the value of "sync_action".
7184 */
7185 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7186 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d
N
7187 /* Clear some bits that don't mean anything, but
7188 * might be left set
7189 */
24dd469d
N
7190 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7191 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4 7192
5fd6c1dc
N
7193 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7194 goto unlock;
1da177e4
LT
7195 /* no recovery is running.
7196 * remove any failed drives, then
7197 * add spares if possible.
7198 * Spare are also removed and re-added, to allow
7199 * the personality to fail the re-add.
7200 */
1da177e4 7201
b4c4c7b8 7202 if (mddev->reshape_position != MaxSector) {
50ac168a
N
7203 if (mddev->pers->check_reshape == NULL ||
7204 mddev->pers->check_reshape(mddev) != 0)
b4c4c7b8
N
7205 /* Cannot proceed */
7206 goto unlock;
7207 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
72a23c21 7208 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
b4c4c7b8 7209 } else if ((spares = remove_and_add_spares(mddev))) {
24dd469d
N
7210 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7211 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
56ac36d7 7212 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
72a23c21 7213 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
24dd469d
N
7214 } else if (mddev->recovery_cp < MaxSector) {
7215 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
72a23c21 7216 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
24dd469d
N
7217 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7218 /* nothing to be done ... */
1da177e4 7219 goto unlock;
24dd469d 7220
1da177e4 7221 if (mddev->pers->sync_request) {
a654b9d8
N
7222 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
7223 /* We are adding a device or devices to an array
7224 * which has the bitmap stored on all devices.
7225 * So make sure all bitmap pages get written
7226 */
7227 bitmap_write_all(mddev->bitmap);
7228 }
1da177e4
LT
7229 mddev->sync_thread = md_register_thread(md_do_sync,
7230 mddev,
0da3c619 7231 "resync");
1da177e4
LT
7232 if (!mddev->sync_thread) {
7233 printk(KERN_ERR "%s: could not start resync"
7234 " thread...\n",
7235 mdname(mddev));
7236 /* leave the spares where they are, it shouldn't hurt */
7ebc0be7
N
7237 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7238 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7239 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7240 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7241 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
d7603b7e 7242 } else
1da177e4 7243 md_wakeup_thread(mddev->sync_thread);
00bcb4ac 7244 sysfs_notify_dirent_safe(mddev->sysfs_action);
d7603b7e 7245 md_new_event(mddev);
1da177e4
LT
7246 }
7247 unlock:
72a23c21
NB
7248 if (!mddev->sync_thread) {
7249 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7250 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7251 &mddev->recovery))
0c3573f1 7252 if (mddev->sysfs_action)
00bcb4ac 7253 sysfs_notify_dirent_safe(mddev->sysfs_action);
72a23c21 7254 }
1da177e4
LT
7255 mddev_unlock(mddev);
7256 }
7257}
7258
6bfe0b49
DW
7259void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
7260{
00bcb4ac 7261 sysfs_notify_dirent_safe(rdev->sysfs_state);
6bfe0b49
DW
7262 wait_event_timeout(rdev->blocked_wait,
7263 !test_bit(Blocked, &rdev->flags),
7264 msecs_to_jiffies(5000));
7265 rdev_dec_pending(rdev, mddev);
7266}
7267EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7268
75c96f85
AB
7269static int md_notify_reboot(struct notifier_block *this,
7270 unsigned long code, void *x)
1da177e4
LT
7271{
7272 struct list_head *tmp;
7273 mddev_t *mddev;
7274
7275 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
7276
7277 printk(KERN_INFO "md: stopping all md devices.\n");
7278
29ac4aa3 7279 for_each_mddev(mddev, tmp)
c71d4887 7280 if (mddev_trylock(mddev)) {
2b25000b
N
7281 /* Force a switch to readonly even array
7282 * appears to still be in use. Hence
7283 * the '100'.
7284 */
a4bd82d0 7285 md_set_readonly(mddev, 100);
c71d4887
NB
7286 mddev_unlock(mddev);
7287 }
1da177e4
LT
7288 /*
7289 * certain more exotic SCSI devices are known to be
7290 * volatile wrt too early system reboots. While the
7291 * right place to handle this issue is the given
7292 * driver, we do want to have a safe RAID driver ...
7293 */
7294 mdelay(1000*1);
7295 }
7296 return NOTIFY_DONE;
7297}
7298
75c96f85 7299static struct notifier_block md_notifier = {
1da177e4
LT
7300 .notifier_call = md_notify_reboot,
7301 .next = NULL,
7302 .priority = INT_MAX, /* before any real devices */
7303};
7304
7305static void md_geninit(void)
7306{
1da177e4
LT
7307 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
7308
c7705f34 7309 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
1da177e4
LT
7310}
7311
75c96f85 7312static int __init md_init(void)
1da177e4 7313{
e804ac78
TH
7314 int ret = -ENOMEM;
7315
7316 md_wq = alloc_workqueue("md", WQ_RESCUER, 0);
7317 if (!md_wq)
7318 goto err_wq;
7319
7320 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
7321 if (!md_misc_wq)
7322 goto err_misc_wq;
7323
7324 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
7325 goto err_md;
7326
7327 if ((ret = register_blkdev(0, "mdp")) < 0)
7328 goto err_mdp;
7329 mdp_major = ret;
7330
3dbd8c2e 7331 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
e8703fe1
N
7332 md_probe, NULL, NULL);
7333 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
1da177e4
LT
7334 md_probe, NULL, NULL);
7335
1da177e4 7336 register_reboot_notifier(&md_notifier);
0b4d4147 7337 raid_table_header = register_sysctl_table(raid_root_table);
1da177e4
LT
7338
7339 md_geninit();
d710e138 7340 return 0;
1da177e4 7341
e804ac78
TH
7342err_mdp:
7343 unregister_blkdev(MD_MAJOR, "md");
7344err_md:
7345 destroy_workqueue(md_misc_wq);
7346err_misc_wq:
7347 destroy_workqueue(md_wq);
7348err_wq:
7349 return ret;
7350}
1da177e4
LT
7351
7352#ifndef MODULE
7353
7354/*
7355 * Searches all registered partitions for autorun RAID arrays
7356 * at boot time.
7357 */
4d936ec1
ME
7358
7359static LIST_HEAD(all_detected_devices);
7360struct detected_devices_node {
7361 struct list_head list;
7362 dev_t dev;
7363};
1da177e4
LT
7364
7365void md_autodetect_dev(dev_t dev)
7366{
4d936ec1
ME
7367 struct detected_devices_node *node_detected_dev;
7368
7369 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
7370 if (node_detected_dev) {
7371 node_detected_dev->dev = dev;
7372 list_add_tail(&node_detected_dev->list, &all_detected_devices);
7373 } else {
7374 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
7375 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
7376 }
1da177e4
LT
7377}
7378
7379
7380static void autostart_arrays(int part)
7381{
7382 mdk_rdev_t *rdev;
4d936ec1
ME
7383 struct detected_devices_node *node_detected_dev;
7384 dev_t dev;
7385 int i_scanned, i_passed;
1da177e4 7386
4d936ec1
ME
7387 i_scanned = 0;
7388 i_passed = 0;
1da177e4 7389
4d936ec1 7390 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
1da177e4 7391
4d936ec1
ME
7392 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
7393 i_scanned++;
7394 node_detected_dev = list_entry(all_detected_devices.next,
7395 struct detected_devices_node, list);
7396 list_del(&node_detected_dev->list);
7397 dev = node_detected_dev->dev;
7398 kfree(node_detected_dev);
df968c4e 7399 rdev = md_import_device(dev,0, 90);
1da177e4
LT
7400 if (IS_ERR(rdev))
7401 continue;
7402
b2d444d7 7403 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT
7404 MD_BUG();
7405 continue;
7406 }
d0fae18f 7407 set_bit(AutoDetected, &rdev->flags);
1da177e4 7408 list_add(&rdev->same_set, &pending_raid_disks);
4d936ec1 7409 i_passed++;
1da177e4 7410 }
4d936ec1
ME
7411
7412 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
7413 i_scanned, i_passed);
1da177e4
LT
7414
7415 autorun_devices(part);
7416}
7417
fdee8ae4 7418#endif /* !MODULE */
1da177e4
LT
7419
7420static __exit void md_exit(void)
7421{
7422 mddev_t *mddev;
7423 struct list_head *tmp;
8ab5e4c1 7424
3dbd8c2e 7425 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
e8703fe1 7426 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
1da177e4 7427
3dbd8c2e 7428 unregister_blkdev(MD_MAJOR,"md");
1da177e4
LT
7429 unregister_blkdev(mdp_major, "mdp");
7430 unregister_reboot_notifier(&md_notifier);
7431 unregister_sysctl_table(raid_table_header);
7432 remove_proc_entry("mdstat", NULL);
29ac4aa3 7433 for_each_mddev(mddev, tmp) {
1da177e4 7434 export_array(mddev);
d3374825 7435 mddev->hold_active = 0;
1da177e4 7436 }
e804ac78
TH
7437 destroy_workqueue(md_misc_wq);
7438 destroy_workqueue(md_wq);
1da177e4
LT
7439}
7440
685784aa 7441subsys_initcall(md_init);
1da177e4
LT
7442module_exit(md_exit)
7443
f91de92e
N
7444static int get_ro(char *buffer, struct kernel_param *kp)
7445{
7446 return sprintf(buffer, "%d", start_readonly);
7447}
7448static int set_ro(const char *val, struct kernel_param *kp)
7449{
7450 char *e;
7451 int num = simple_strtoul(val, &e, 10);
7452 if (*val && (*e == '\0' || *e == '\n')) {
7453 start_readonly = num;
4dbcdc75 7454 return 0;
f91de92e
N
7455 }
7456 return -EINVAL;
7457}
7458
80ca3a44
N
7459module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
7460module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6ff8d8ec 7461
efeb53c0 7462module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
f91de92e 7463
1da177e4
LT
7464EXPORT_SYMBOL(register_md_personality);
7465EXPORT_SYMBOL(unregister_md_personality);
7466EXPORT_SYMBOL(md_error);
7467EXPORT_SYMBOL(md_done_sync);
7468EXPORT_SYMBOL(md_write_start);
7469EXPORT_SYMBOL(md_write_end);
1da177e4
LT
7470EXPORT_SYMBOL(md_register_thread);
7471EXPORT_SYMBOL(md_unregister_thread);
7472EXPORT_SYMBOL(md_wakeup_thread);
1da177e4
LT
7473EXPORT_SYMBOL(md_check_recovery);
7474MODULE_LICENSE("GPL");
0efb9e61 7475MODULE_DESCRIPTION("MD RAID framework");
aa1595e9 7476MODULE_ALIAS("md");
72008652 7477MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);