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md: rationalize raid5 function names
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / md / md.c
CommitLineData
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
35#include <linux/module.h>
50511da3 36#include <linux/kernel.h>
a6fb0934 37#include <linux/kthread.h>
1da177e4
LT		 38#include <linux/linkage.h>
39#include <linux/raid/md.h>
32a7627c 40#include <linux/raid/bitmap.h>
1da177e4 41#include <linux/sysctl.h>
1da177e4 42#include <linux/buffer_head.h> /* for invalidate_bdev */
d7603b7e 43#include <linux/poll.h>
48c9c27b 44#include <linux/mutex.h>
16f17b39 45#include <linux/ctype.h>
7dfb7103 46#include <linux/freezer.h>
1da177e4
LT		 47
48#include <linux/init.h>
49
32a7627c
N		 50#include <linux/file.h>
51
1da177e4
LT		 52#ifdef CONFIG_KMOD
53#include <linux/kmod.h>
54#endif
55
56#include <asm/unaligned.h>
57
58#define MAJOR_NR MD_MAJOR
59#define MD_DRIVER
60
61/* 63 partitions with the alternate major number (mdp) */
62#define MdpMinorShift 6
63
64#define DEBUG 0
65#define dprintk(x...) ((void)(DEBUG && printk(x)))
66
67
68#ifndef MODULE
69static void autostart_arrays (int part);
70#endif
71
2604b703 72static LIST_HEAD(pers_list);
1da177e4
LT		 73static DEFINE_SPINLOCK(pers_lock);
74
5e56341d
AB		 75static void md_print_devices(void);
76
90b08710
BS		 77static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
78
5e56341d
AB		 79#define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
80
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 {
112 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
113 .procname = "speed_limit_min",
114 .data = &sysctl_speed_limit_min,
115 .maxlen = sizeof(int),
80ca3a44 116 .mode = S_IRUGO|S_IWUSR,
1da177e4
LT		 117 .proc_handler = &proc_dointvec,
118 },
119 {
120 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
121 .procname = "speed_limit_max",
122 .data = &sysctl_speed_limit_max,
123 .maxlen = sizeof(int),
80ca3a44 124 .mode = S_IRUGO|S_IWUSR,
1da177e4
LT		 125 .proc_handler = &proc_dointvec,
126 },
127 { .ctl_name = 0 }
128};
129
130static ctl_table raid_dir_table[] = {
131 {
132 .ctl_name = DEV_RAID,
133 .procname = "raid",
134 .maxlen = 0,
80ca3a44 135 .mode = S_IRUGO|S_IXUGO,
1da177e4
LT		 136 .child = raid_table,
137 },
138 { .ctl_name = 0 }
139};
140
141static ctl_table raid_root_table[] = {
142 {
143 .ctl_name = CTL_DEV,
144 .procname = "dev",
145 .maxlen = 0,
146 .mode = 0555,
147 .child = raid_dir_table,
148 },
149 { .ctl_name = 0 }
150};
151
152static struct block_device_operations md_fops;
153
f91de92e
N		 154static int start_readonly;
155
d7603b7e
N		 156/*
157 * We have a system wide 'event count' that is incremented
158 * on any 'interesting' event, and readers of /proc/mdstat
159 * can use 'poll' or 'select' to find out when the event
160 * count increases.
161 *
162 * Events are:
163 * start array, stop array, error, add device, remove device,
164 * start build, activate spare
165 */
2989ddbd 166static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
d7603b7e 167static atomic_t md_event_count;
29269553 168void md_new_event(mddev_t *mddev)
d7603b7e
N		 169{
170 atomic_inc(&md_event_count);
171 wake_up(&md_event_waiters);
172}
29269553 173EXPORT_SYMBOL_GPL(md_new_event);
d7603b7e 174
c331eb04
N		 175/* Alternate version that can be called from interrupts
176 * when calling sysfs_notify isn't needed.
177 */
05381954 178static void md_new_event_inintr(mddev_t *mddev)
c331eb04
N		 179{
180 atomic_inc(&md_event_count);
181 wake_up(&md_event_waiters);
182}
183
1da177e4
LT		 184/*
185 * Enables to iterate over all existing md arrays
186 * all_mddevs_lock protects this list.
187 */
188static LIST_HEAD(all_mddevs);
189static DEFINE_SPINLOCK(all_mddevs_lock);
190
191
192/*
193 * iterates through all used mddevs in the system.
194 * We take care to grab the all_mddevs_lock whenever navigating
195 * the list, and to always hold a refcount when unlocked.
196 * Any code which breaks out of this loop while own
197 * a reference to the current mddev and must mddev_put it.
198 */
29ac4aa3 199#define for_each_mddev(mddev,tmp) \
1da177e4
LT		 200 \
201 for (({ spin_lock(&all_mddevs_lock); \
202 tmp = all_mddevs.next; \
203 mddev = NULL;}); \
204 ({ if (tmp != &all_mddevs) \
205 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
206 spin_unlock(&all_mddevs_lock); \
207 if (mddev) mddev_put(mddev); \
208 mddev = list_entry(tmp, mddev_t, all_mddevs); \
209 tmp != &all_mddevs;}); \
210 ({ spin_lock(&all_mddevs_lock); \
211 tmp = tmp->next;}) \
212 )
213
214
165125e1 215static int md_fail_request (struct request_queue *q, struct bio *bio)
1da177e4 216{
6712ecf8 217 bio_io_error(bio);
1da177e4
LT		 218 return 0;
219}
220
221static inline mddev_t *mddev_get(mddev_t *mddev)
222{
223 atomic_inc(&mddev->active);
224 return mddev;
225}
226
227static void mddev_put(mddev_t *mddev)
228{
229 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
230 return;
231 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
232 list_del(&mddev->all_mddevs);
926ce2d8 233 spin_unlock(&all_mddevs_lock);
1312f40e 234 blk_cleanup_queue(mddev->queue);
c10997f6 235 kobject_put(&mddev->kobj);
926ce2d8
N		 236 } else
237 spin_unlock(&all_mddevs_lock);
1da177e4
LT		 238}
239
240static mddev_t * mddev_find(dev_t unit)
241{
242 mddev_t *mddev, *new = NULL;
243
244 retry:
245 spin_lock(&all_mddevs_lock);
246 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
247 if (mddev->unit == unit) {
248 mddev_get(mddev);
249 spin_unlock(&all_mddevs_lock);
990a8baf 250 kfree(new);
1da177e4
LT		 251 return mddev;
252 }
253
254 if (new) {
255 list_add(&new->all_mddevs, &all_mddevs);
256 spin_unlock(&all_mddevs_lock);
257 return new;
258 }
259 spin_unlock(&all_mddevs_lock);
260
9ffae0cf 261 new = kzalloc(sizeof(*new), GFP_KERNEL);
1da177e4
LT		 262 if (!new)
263 return NULL;
264
1da177e4
LT		 265 new->unit = unit;
266 if (MAJOR(unit) == MD_MAJOR)
267 new->md_minor = MINOR(unit);
268 else
269 new->md_minor = MINOR(unit) >> MdpMinorShift;
270
df5b89b3 271 mutex_init(&new->reconfig_mutex);
1da177e4
LT		 272 INIT_LIST_HEAD(&new->disks);
273 INIT_LIST_HEAD(&new->all_mddevs);
274 init_timer(&new->safemode_timer);
275 atomic_set(&new->active, 1);
06d91a5f 276 spin_lock_init(&new->write_lock);
3d310eb7 277 init_waitqueue_head(&new->sb_wait);
a6d8113a 278 init_waitqueue_head(&new->recovery_wait);
08a02ecd 279 new->reshape_position = MaxSector;
5e96ee65 280 new->resync_min = 0;
c6207277 281 new->resync_max = MaxSector;
d897dbf9 282 new->level = LEVEL_NONE;
1da177e4
LT		 283
284 new->queue = blk_alloc_queue(GFP_KERNEL);
285 if (!new->queue) {
286 kfree(new);
287 return NULL;
288 }
75ad23bc
NP		 289 /* Can be unlocked because the queue is new: no concurrency */
290 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, new->queue);
1da177e4
LT		 291
292 blk_queue_make_request(new->queue, md_fail_request);
293
294 goto retry;
295}
296
297static inline int mddev_lock(mddev_t * mddev)
298{
df5b89b3 299 return mutex_lock_interruptible(&mddev->reconfig_mutex);
1da177e4
LT		 300}
301
1da177e4
LT		 302static inline int mddev_trylock(mddev_t * mddev)
303{
df5b89b3 304 return mutex_trylock(&mddev->reconfig_mutex);
1da177e4
LT		 305}
306
307static inline void mddev_unlock(mddev_t * mddev)
308{
df5b89b3 309 mutex_unlock(&mddev->reconfig_mutex);
1da177e4 310
005eca5e 311 md_wakeup_thread(mddev->thread);
1da177e4
LT		 312}
313
2989ddbd 314static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
1da177e4
LT		 315{
316 mdk_rdev_t * rdev;
317 struct list_head *tmp;
318
d089c6af 319 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 320 if (rdev->desc_nr == nr)
321 return rdev;
322 }
323 return NULL;
324}
325
326static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
327{
328 struct list_head *tmp;
329 mdk_rdev_t *rdev;
330
d089c6af 331 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 332 if (rdev->bdev->bd_dev == dev)
333 return rdev;
334 }
335 return NULL;
336}
337
d9d166c2 338static struct mdk_personality *find_pers(int level, char *clevel)
2604b703
N		 339{
340 struct mdk_personality *pers;
d9d166c2
N		 341 list_for_each_entry(pers, &pers_list, list) {
342 if (level != LEVEL_NONE && pers->level == level)
2604b703 343 return pers;
d9d166c2
N		 344 if (strcmp(pers->name, clevel)==0)
345 return pers;
346 }
2604b703
N		 347 return NULL;
348}
349
77933d72 350static inline sector_t calc_dev_sboffset(struct block_device *bdev)
1da177e4
LT		 351{
352 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
353 return MD_NEW_SIZE_BLOCKS(size);
354}
355
356static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
357{
358 sector_t size;
359
360 size = rdev->sb_offset;
361
362 if (chunk_size)
363 size &= ~((sector_t)chunk_size/1024 - 1);
364 return size;
365}
366
367static int alloc_disk_sb(mdk_rdev_t * rdev)
368{
369 if (rdev->sb_page)
370 MD_BUG();
371
372 rdev->sb_page = alloc_page(GFP_KERNEL);
373 if (!rdev->sb_page) {
374 printk(KERN_ALERT "md: out of memory.\n");
375 return -EINVAL;
376 }
377
378 return 0;
379}
380
381static void free_disk_sb(mdk_rdev_t * rdev)
382{
383 if (rdev->sb_page) {
2d1f3b5d 384 put_page(rdev->sb_page);
1da177e4
LT		 385 rdev->sb_loaded = 0;
386 rdev->sb_page = NULL;
387 rdev->sb_offset = 0;
388 rdev->size = 0;
389 }
390}
391
392
6712ecf8 393static void super_written(struct bio *bio, int error)
7bfa19f2
N		 394{
395 mdk_rdev_t *rdev = bio->bi_private;
a9701a30 396 mddev_t *mddev = rdev->mddev;
7bfa19f2 397
3a0f5bbb
N		 398 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
399 printk("md: super_written gets error=%d, uptodate=%d\n",
400 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
401 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
a9701a30 402 md_error(mddev, rdev);
3a0f5bbb 403 }
7bfa19f2 404
a9701a30
N		 405 if (atomic_dec_and_test(&mddev->pending_writes))
406 wake_up(&mddev->sb_wait);
f8b58edf 407 bio_put(bio);
7bfa19f2
N		 408}
409
6712ecf8 410static void super_written_barrier(struct bio *bio, int error)
a9701a30
N		 411{
412 struct bio *bio2 = bio->bi_private;
413 mdk_rdev_t *rdev = bio2->bi_private;
414 mddev_t *mddev = rdev->mddev;
a9701a30
N		 415
416 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
417 error == -EOPNOTSUPP) {
418 unsigned long flags;
419 /* barriers don't appear to be supported :-( */
420 set_bit(BarriersNotsupp, &rdev->flags);
421 mddev->barriers_work = 0;
422 spin_lock_irqsave(&mddev->write_lock, flags);
423 bio2->bi_next = mddev->biolist;
424 mddev->biolist = bio2;
425 spin_unlock_irqrestore(&mddev->write_lock, flags);
426 wake_up(&mddev->sb_wait);
427 bio_put(bio);
6712ecf8
N		 428 } else {
429 bio_put(bio2);
430 bio->bi_private = rdev;
431 super_written(bio, error);
a9701a30 432 }
a9701a30
N		 433}
434
7bfa19f2
N		 435void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
436 sector_t sector, int size, struct page *page)
437{
438 /* write first size bytes of page to sector of rdev
439 * Increment mddev->pending_writes before returning
440 * and decrement it on completion, waking up sb_wait
441 * if zero is reached.
442 * If an error occurred, call md_error
a9701a30
N		 443 *
444 * As we might need to resubmit the request if BIO_RW_BARRIER
445 * causes ENOTSUPP, we allocate a spare bio...
7bfa19f2
N		 446 */
447 struct bio *bio = bio_alloc(GFP_NOIO, 1);
a9701a30 448 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
7bfa19f2
N		 449
450 bio->bi_bdev = rdev->bdev;
451 bio->bi_sector = sector;
452 bio_add_page(bio, page, size, 0);
453 bio->bi_private = rdev;
454 bio->bi_end_io = super_written;
a9701a30
N		 455 bio->bi_rw = rw;
456
7bfa19f2 457 atomic_inc(&mddev->pending_writes);
a9701a30
N		 458 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
459 struct bio *rbio;
460 rw |= (1<<BIO_RW_BARRIER);
461 rbio = bio_clone(bio, GFP_NOIO);
462 rbio->bi_private = bio;
463 rbio->bi_end_io = super_written_barrier;
464 submit_bio(rw, rbio);
465 } else
466 submit_bio(rw, bio);
467}
468
469void md_super_wait(mddev_t *mddev)
470{
471 /* wait for all superblock writes that were scheduled to complete.
472 * if any had to be retried (due to BARRIER problems), retry them
473 */
474 DEFINE_WAIT(wq);
475 for(;;) {
476 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
477 if (atomic_read(&mddev->pending_writes)==0)
478 break;
479 while (mddev->biolist) {
480 struct bio *bio;
481 spin_lock_irq(&mddev->write_lock);
482 bio = mddev->biolist;
483 mddev->biolist = bio->bi_next ;
484 bio->bi_next = NULL;
485 spin_unlock_irq(&mddev->write_lock);
486 submit_bio(bio->bi_rw, bio);
487 }
488 schedule();
489 }
490 finish_wait(&mddev->sb_wait, &wq);
7bfa19f2
N		 491}
492
6712ecf8 493static void bi_complete(struct bio *bio, int error)
1da177e4 494{
1da177e4 495 complete((struct completion*)bio->bi_private);
1da177e4
LT		 496}
497
a654b9d8 498int sync_page_io(struct block_device *bdev, sector_t sector, int size,
1da177e4
LT		 499 struct page *page, int rw)
500{
baaa2c51 501 struct bio *bio = bio_alloc(GFP_NOIO, 1);
1da177e4
LT		 502 struct completion event;
503 int ret;
504
505 rw |= (1 << BIO_RW_SYNC);
506
507 bio->bi_bdev = bdev;
508 bio->bi_sector = sector;
509 bio_add_page(bio, page, size, 0);
510 init_completion(&event);
511 bio->bi_private = &event;
512 bio->bi_end_io = bi_complete;
513 submit_bio(rw, bio);
514 wait_for_completion(&event);
515
516 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
517 bio_put(bio);
518 return ret;
519}
a8745db2 520EXPORT_SYMBOL_GPL(sync_page_io);
1da177e4 521
0002b271 522static int read_disk_sb(mdk_rdev_t * rdev, int size)
1da177e4
LT		 523{
524 char b[BDEVNAME_SIZE];
525 if (!rdev->sb_page) {
526 MD_BUG();
527 return -EINVAL;
528 }
529 if (rdev->sb_loaded)
530 return 0;
531
532
0002b271 533 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
1da177e4
LT		 534 goto fail;
535 rdev->sb_loaded = 1;
536 return 0;
537
538fail:
539 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
540 bdevname(rdev->bdev,b));
541 return -EINVAL;
542}
543
544static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
545{
546 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
547 (sb1->set_uuid1 == sb2->set_uuid1) &&
548 (sb1->set_uuid2 == sb2->set_uuid2) &&
549 (sb1->set_uuid3 == sb2->set_uuid3))
550
551 return 1;
552
553 return 0;
554}
555
556
557static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
558{
559 int ret;
560 mdp_super_t *tmp1, *tmp2;
561
562 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
563 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
564
565 if (!tmp1 || !tmp2) {
566 ret = 0;
567 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
568 goto abort;
569 }
570
571 *tmp1 = *sb1;
572 *tmp2 = *sb2;
573
574 /*
575 * nr_disks is not constant
576 */
577 tmp1->nr_disks = 0;
578 tmp2->nr_disks = 0;
579
580 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
581 ret = 0;
582 else
583 ret = 1;
584
585abort:
990a8baf
JJ		 586 kfree(tmp1);
587 kfree(tmp2);
1da177e4
LT		 588 return ret;
589}
590
4d167f09
N		 591
592static u32 md_csum_fold(u32 csum)
593{
594 csum = (csum & 0xffff) + (csum >> 16);
595 return (csum & 0xffff) + (csum >> 16);
596}
597
1da177e4
LT		 598static unsigned int calc_sb_csum(mdp_super_t * sb)
599{
4d167f09
N		 600 u64 newcsum = 0;
601 u32 *sb32 = (u32*)sb;
602 int i;
1da177e4
LT		 603 unsigned int disk_csum, csum;
604
605 disk_csum = sb->sb_csum;
606 sb->sb_csum = 0;
4d167f09
N		 607
608 for (i = 0; i < MD_SB_BYTES/4 ; i++)
609 newcsum += sb32[i];
610 csum = (newcsum & 0xffffffff) + (newcsum>>32);
611
612
613#ifdef CONFIG_ALPHA
614 /* This used to use csum_partial, which was wrong for several
615 * reasons including that different results are returned on
616 * different architectures. It isn't critical that we get exactly
617 * the same return value as before (we always csum_fold before
618 * testing, and that removes any differences). However as we
619 * know that csum_partial always returned a 16bit value on
620 * alphas, do a fold to maximise conformity to previous behaviour.
621 */
622 sb->sb_csum = md_csum_fold(disk_csum);
623#else
1da177e4 624 sb->sb_csum = disk_csum;
4d167f09 625#endif
1da177e4
LT		 626 return csum;
627}
628
629
630/*
631 * Handle superblock details.
632 * We want to be able to handle multiple superblock formats
633 * so we have a common interface to them all, and an array of
634 * different handlers.
635 * We rely on user-space to write the initial superblock, and support
636 * reading and updating of superblocks.
637 * Interface methods are:
638 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
639 * loads and validates a superblock on dev.
640 * if refdev != NULL, compare superblocks on both devices
641 * Return:
642 * 0 - dev has a superblock that is compatible with refdev
643 * 1 - dev has a superblock that is compatible and newer than refdev
644 * so dev should be used as the refdev in future
645 * -EINVAL superblock incompatible or invalid
646 * -othererror e.g. -EIO
647 *
648 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
649 * Verify that dev is acceptable into mddev.
650 * The first time, mddev->raid_disks will be 0, and data from
651 * dev should be merged in. Subsequent calls check that dev
652 * is new enough. Return 0 or -EINVAL
653 *
654 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
655 * Update the superblock for rdev with data in mddev
656 * This does not write to disc.
657 *
658 */
659
660struct super_type {
0cd17fec
CW		 661 char *name;
662 struct module *owner;
663 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
664 int minor_version);
665 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
666 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
667 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
668 unsigned long long size);
1da177e4
LT		 669};
670
671/*
672 * load_super for 0.90.0
673 */
674static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
675{
676 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
677 mdp_super_t *sb;
678 int ret;
679 sector_t sb_offset;
680
681 /*
682 * Calculate the position of the superblock,
683 * it's at the end of the disk.
684 *
685 * It also happens to be a multiple of 4Kb.
686 */
687 sb_offset = calc_dev_sboffset(rdev->bdev);
688 rdev->sb_offset = sb_offset;
689
0002b271 690 ret = read_disk_sb(rdev, MD_SB_BYTES);
1da177e4
LT		 691 if (ret) return ret;
692
693 ret = -EINVAL;
694
695 bdevname(rdev->bdev, b);
696 sb = (mdp_super_t*)page_address(rdev->sb_page);
697
698 if (sb->md_magic != MD_SB_MAGIC) {
699 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
700 b);
701 goto abort;
702 }
703
704 if (sb->major_version != 0 ||
f6705578
N		 705 sb->minor_version < 90 ||
706 sb->minor_version > 91) {
1da177e4
LT		 707 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
708 sb->major_version, sb->minor_version,
709 b);
710 goto abort;
711 }
712
713 if (sb->raid_disks <= 0)
714 goto abort;
715
4d167f09 716 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1da177e4
LT		 717 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
718 b);
719 goto abort;
720 }
721
722 rdev->preferred_minor = sb->md_minor;
723 rdev->data_offset = 0;
0002b271 724 rdev->sb_size = MD_SB_BYTES;
1da177e4 725
e11e93fa
N		 726 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
727 if (sb->level != 1 && sb->level != 4
728 && sb->level != 5 && sb->level != 6
729 && sb->level != 10) {
730 /* FIXME use a better test */
731 printk(KERN_WARNING
732 "md: bitmaps not supported for this level.\n");
733 goto abort;
734 }
735 }
736
1da177e4
LT		 737 if (sb->level == LEVEL_MULTIPATH)
738 rdev->desc_nr = -1;
739 else
740 rdev->desc_nr = sb->this_disk.number;
741
9a7b2b0f 742 if (!refdev) {
1da177e4 743 ret = 1;
9a7b2b0f 744 } else {
1da177e4
LT		 745 __u64 ev1, ev2;
746 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
747 if (!uuid_equal(refsb, sb)) {
748 printk(KERN_WARNING "md: %s has different UUID to %s\n",
749 b, bdevname(refdev->bdev,b2));
750 goto abort;
751 }
752 if (!sb_equal(refsb, sb)) {
753 printk(KERN_WARNING "md: %s has same UUID"
754 " but different superblock to %s\n",
755 b, bdevname(refdev->bdev, b2));
756 goto abort;
757 }
758 ev1 = md_event(sb);
759 ev2 = md_event(refsb);
760 if (ev1 > ev2)
761 ret = 1;
762 else
763 ret = 0;
764 }
765 rdev->size = calc_dev_size(rdev, sb->chunk_size);
766
2bf071bf
N		 767 if (rdev->size < sb->size && sb->level > 1)
768 /* "this cannot possibly happen" ... */
769 ret = -EINVAL;
770
1da177e4
LT		 771 abort:
772 return ret;
773}
774
775/*
776 * validate_super for 0.90.0
777 */
778static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
779{
780 mdp_disk_t *desc;
781 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
07d84d10 782 __u64 ev1 = md_event(sb);
1da177e4 783
41158c7e 784 rdev->raid_disk = -1;
c5d79adb
N		 785 clear_bit(Faulty, &rdev->flags);
786 clear_bit(In_sync, &rdev->flags);
787 clear_bit(WriteMostly, &rdev->flags);
788 clear_bit(BarriersNotsupp, &rdev->flags);
789
1da177e4
LT		 790 if (mddev->raid_disks == 0) {
791 mddev->major_version = 0;
792 mddev->minor_version = sb->minor_version;
793 mddev->patch_version = sb->patch_version;
e691063a 794 mddev->external = 0;
1da177e4
LT		 795 mddev->chunk_size = sb->chunk_size;
796 mddev->ctime = sb->ctime;
797 mddev->utime = sb->utime;
798 mddev->level = sb->level;
d9d166c2 799 mddev->clevel[0] = 0;
1da177e4
LT		 800 mddev->layout = sb->layout;
801 mddev->raid_disks = sb->raid_disks;
802 mddev->size = sb->size;
07d84d10 803 mddev->events = ev1;
9223214e 804 mddev->bitmap_offset = 0;
36fa3063 805 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
1da177e4 806
f6705578
N		 807 if (mddev->minor_version >= 91) {
808 mddev->reshape_position = sb->reshape_position;
809 mddev->delta_disks = sb->delta_disks;
810 mddev->new_level = sb->new_level;
811 mddev->new_layout = sb->new_layout;
812 mddev->new_chunk = sb->new_chunk;
813 } else {
814 mddev->reshape_position = MaxSector;
815 mddev->delta_disks = 0;
816 mddev->new_level = mddev->level;
817 mddev->new_layout = mddev->layout;
818 mddev->new_chunk = mddev->chunk_size;
819 }
820
1da177e4
LT		 821 if (sb->state & (1<<MD_SB_CLEAN))
822 mddev->recovery_cp = MaxSector;
823 else {
824 if (sb->events_hi == sb->cp_events_hi &&
825 sb->events_lo == sb->cp_events_lo) {
826 mddev->recovery_cp = sb->recovery_cp;
827 } else
828 mddev->recovery_cp = 0;
829 }
830
831 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
832 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
833 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
834 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
835
836 mddev->max_disks = MD_SB_DISKS;
a654b9d8
N		 837
838 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
e11e93fa 839 mddev->bitmap_file == NULL)
36fa3063 840 mddev->bitmap_offset = mddev->default_bitmap_offset;
a654b9d8 841
41158c7e
N		 842 } else if (mddev->pers == NULL) {
843 /* Insist on good event counter while assembling */
1da177e4
LT		 844 ++ev1;
845 if (ev1 < mddev->events)
846 return -EINVAL;
41158c7e
N		 847 } else if (mddev->bitmap) {
848 /* if adding to array with a bitmap, then we can accept an
849 * older device ... but not too old.
850 */
41158c7e
N		 851 if (ev1 < mddev->bitmap->events_cleared)
852 return 0;
07d84d10
N		 853 } else {
854 if (ev1 < mddev->events)
855 /* just a hot-add of a new device, leave raid_disk at -1 */
856 return 0;
857 }
41158c7e 858
1da177e4 859 if (mddev->level != LEVEL_MULTIPATH) {
1da177e4
LT		 860 desc = sb->disks + rdev->desc_nr;
861
862 if (desc->state & (1<<MD_DISK_FAULTY))
b2d444d7 863 set_bit(Faulty, &rdev->flags);
7c7546cc
N		 864 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
865 desc->raid_disk < mddev->raid_disks */) {
b2d444d7 866 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 867 rdev->raid_disk = desc->raid_disk;
868 }
8ddf9efe
N		 869 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
870 set_bit(WriteMostly, &rdev->flags);
41158c7e 871 } else /* MULTIPATH are always insync */
b2d444d7 872 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 873 return 0;
874}
875
876/*
877 * sync_super for 0.90.0
878 */
879static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
880{
881 mdp_super_t *sb;
882 struct list_head *tmp;
883 mdk_rdev_t *rdev2;
884 int next_spare = mddev->raid_disks;
19133a42 885
1da177e4
LT		 886
887 /* make rdev->sb match mddev data..
888 *
889 * 1/ zero out disks
890 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
891 * 3/ any empty disks < next_spare become removed
892 *
893 * disks[0] gets initialised to REMOVED because
894 * we cannot be sure from other fields if it has
895 * been initialised or not.
896 */
897 int i;
898 int active=0, working=0,failed=0,spare=0,nr_disks=0;
899
61181565
N		 900 rdev->sb_size = MD_SB_BYTES;
901
1da177e4
LT		 902 sb = (mdp_super_t*)page_address(rdev->sb_page);
903
904 memset(sb, 0, sizeof(*sb));
905
906 sb->md_magic = MD_SB_MAGIC;
907 sb->major_version = mddev->major_version;
1da177e4
LT		 908 sb->patch_version = mddev->patch_version;
909 sb->gvalid_words = 0; /* ignored */
910 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
911 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
912 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
913 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
914
915 sb->ctime = mddev->ctime;
916 sb->level = mddev->level;
917 sb->size = mddev->size;
918 sb->raid_disks = mddev->raid_disks;
919 sb->md_minor = mddev->md_minor;
e691063a 920 sb->not_persistent = 0;
1da177e4
LT		 921 sb->utime = mddev->utime;
922 sb->state = 0;
923 sb->events_hi = (mddev->events>>32);
924 sb->events_lo = (u32)mddev->events;
925
f6705578
N		 926 if (mddev->reshape_position == MaxSector)
927 sb->minor_version = 90;
928 else {
929 sb->minor_version = 91;
930 sb->reshape_position = mddev->reshape_position;
931 sb->new_level = mddev->new_level;
932 sb->delta_disks = mddev->delta_disks;
933 sb->new_layout = mddev->new_layout;
934 sb->new_chunk = mddev->new_chunk;
935 }
936 mddev->minor_version = sb->minor_version;
1da177e4
LT		 937 if (mddev->in_sync)
938 {
939 sb->recovery_cp = mddev->recovery_cp;
940 sb->cp_events_hi = (mddev->events>>32);
941 sb->cp_events_lo = (u32)mddev->events;
942 if (mddev->recovery_cp == MaxSector)
943 sb->state = (1<< MD_SB_CLEAN);
944 } else
945 sb->recovery_cp = 0;
946
947 sb->layout = mddev->layout;
948 sb->chunk_size = mddev->chunk_size;
949
a654b9d8
N		 950 if (mddev->bitmap && mddev->bitmap_file == NULL)
951 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
952
1da177e4 953 sb->disks[0].state = (1<<MD_DISK_REMOVED);
d089c6af 954 rdev_for_each(rdev2, tmp, mddev) {
1da177e4 955 mdp_disk_t *d;
86e6ffdd 956 int desc_nr;
b2d444d7
N		 957 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
958 && !test_bit(Faulty, &rdev2->flags))
86e6ffdd 959 desc_nr = rdev2->raid_disk;
1da177e4 960 else
86e6ffdd 961 desc_nr = next_spare++;
19133a42 962 rdev2->desc_nr = desc_nr;
1da177e4
LT		 963 d = &sb->disks[rdev2->desc_nr];
964 nr_disks++;
965 d->number = rdev2->desc_nr;
966 d->major = MAJOR(rdev2->bdev->bd_dev);
967 d->minor = MINOR(rdev2->bdev->bd_dev);
b2d444d7
N		 968 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
969 && !test_bit(Faulty, &rdev2->flags))
1da177e4
LT		 970 d->raid_disk = rdev2->raid_disk;
971 else
972 d->raid_disk = rdev2->desc_nr; /* compatibility */
1be7892f 973 if (test_bit(Faulty, &rdev2->flags))
1da177e4 974 d->state = (1<<MD_DISK_FAULTY);
1be7892f 975 else if (test_bit(In_sync, &rdev2->flags)) {
1da177e4
LT		 976 d->state = (1<<MD_DISK_ACTIVE);
977 d->state |= (1<<MD_DISK_SYNC);
978 active++;
979 working++;
980 } else {
981 d->state = 0;
982 spare++;
983 working++;
984 }
8ddf9efe
N		 985 if (test_bit(WriteMostly, &rdev2->flags))
986 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4 987 }
1da177e4
LT		 988 /* now set the "removed" and "faulty" bits on any missing devices */
989 for (i=0 ; i < mddev->raid_disks ; i++) {
990 mdp_disk_t *d = &sb->disks[i];
991 if (d->state == 0 && d->number == 0) {
992 d->number = i;
993 d->raid_disk = i;
994 d->state = (1<<MD_DISK_REMOVED);
995 d->state |= (1<<MD_DISK_FAULTY);
996 failed++;
997 }
998 }
999 sb->nr_disks = nr_disks;
1000 sb->active_disks = active;
1001 sb->working_disks = working;
1002 sb->failed_disks = failed;
1003 sb->spare_disks = spare;
1004
1005 sb->this_disk = sb->disks[rdev->desc_nr];
1006 sb->sb_csum = calc_sb_csum(sb);
1007}
1008
0cd17fec
CW		 1009/*
1010 * rdev_size_change for 0.90.0
1011 */
1012static unsigned long long
1013super_90_rdev_size_change(mdk_rdev_t *rdev, unsigned long long size)
1014{
1015 if (size && size < rdev->mddev->size)
1016 return 0; /* component must fit device */
1017 size *= 2; /* convert to sectors */
1018 if (rdev->mddev->bitmap_offset)
1019 return 0; /* can't move bitmap */
1020 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
1021 if (!size || size > rdev->sb_offset*2)
1022 size = rdev->sb_offset*2;
1023 md_super_write(rdev->mddev, rdev, rdev->sb_offset << 1, rdev->sb_size,
1024 rdev->sb_page);
1025 md_super_wait(rdev->mddev);
1026 return size/2; /* kB for sysfs */
1027}
1028
1029
1da177e4
LT		 1030/*
1031 * version 1 superblock
1032 */
1033
1c05b4bc 1034static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1da177e4 1035{
1c05b4bc
N		 1036 __le32 disk_csum;
1037 u32 csum;
1da177e4
LT		 1038 unsigned long long newcsum;
1039 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1c05b4bc 1040 __le32 *isuper = (__le32*)sb;
1da177e4
LT		 1041 int i;
1042
1043 disk_csum = sb->sb_csum;
1044 sb->sb_csum = 0;
1045 newcsum = 0;
1046 for (i=0; size>=4; size -= 4 )
1047 newcsum += le32_to_cpu(*isuper++);
1048
1049 if (size == 2)
1c05b4bc 1050 newcsum += le16_to_cpu(*(__le16*) isuper);
1da177e4
LT		 1051
1052 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1053 sb->sb_csum = disk_csum;
1054 return cpu_to_le32(csum);
1055}
1056
1057static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1058{
1059 struct mdp_superblock_1 *sb;
1060 int ret;
1061 sector_t sb_offset;
1062 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 1063 int bmask;
1da177e4
LT		 1064
1065 /*
1066 * Calculate the position of the superblock.
1067 * It is always aligned to a 4K boundary and
1068 * depeding on minor_version, it can be:
1069 * 0: At least 8K, but less than 12K, from end of device
1070 * 1: At start of device
1071 * 2: 4K from start of device.
1072 */
1073 switch(minor_version) {
1074 case 0:
1075 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1076 sb_offset -= 8*2;
39730960 1077 sb_offset &= ~(sector_t)(4*2-1);
1da177e4
LT		 1078 /* convert from sectors to K */
1079 sb_offset /= 2;
1080 break;
1081 case 1:
1082 sb_offset = 0;
1083 break;
1084 case 2:
1085 sb_offset = 4;
1086 break;
1087 default:
1088 return -EINVAL;
1089 }
1090 rdev->sb_offset = sb_offset;
1091
0002b271
N		 1092 /* superblock is rarely larger than 1K, but it can be larger,
1093 * and it is safe to read 4k, so we do that
1094 */
1095 ret = read_disk_sb(rdev, 4096);
1da177e4
LT		 1096 if (ret) return ret;
1097
1098
1099 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1100
1101 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1102 sb->major_version != cpu_to_le32(1) ||
1103 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1104 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
71c0805c 1105 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT		 1106 return -EINVAL;
1107
1108 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1109 printk("md: invalid superblock checksum on %s\n",
1110 bdevname(rdev->bdev,b));
1111 return -EINVAL;
1112 }
1113 if (le64_to_cpu(sb->data_size) < 10) {
1114 printk("md: data_size too small on %s\n",
1115 bdevname(rdev->bdev,b));
1116 return -EINVAL;
1117 }
e11e93fa
N		 1118 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1119 if (sb->level != cpu_to_le32(1) &&
1120 sb->level != cpu_to_le32(4) &&
1121 sb->level != cpu_to_le32(5) &&
1122 sb->level != cpu_to_le32(6) &&
1123 sb->level != cpu_to_le32(10)) {
1124 printk(KERN_WARNING
1125 "md: bitmaps not supported for this level.\n");
1126 return -EINVAL;
1127 }
1128 }
1129
1da177e4
LT		 1130 rdev->preferred_minor = 0xffff;
1131 rdev->data_offset = le64_to_cpu(sb->data_offset);
4dbcdc75 1132 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1da177e4 1133
0002b271 1134 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
720a3dc3 1135 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
0002b271 1136 if (rdev->sb_size & bmask)
a1801f85
N		 1137 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1138
1139 if (minor_version
1140 && rdev->data_offset < sb_offset + (rdev->sb_size/512))
1141 return -EINVAL;
0002b271 1142
31b65a0d
N		 1143 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1144 rdev->desc_nr = -1;
1145 else
1146 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1147
9a7b2b0f 1148 if (!refdev) {
8ed75463 1149 ret = 1;
9a7b2b0f 1150 } else {
1da177e4
LT		 1151 __u64 ev1, ev2;
1152 struct mdp_superblock_1 *refsb =
1153 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1154
1155 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1156 sb->level != refsb->level ||
1157 sb->layout != refsb->layout ||
1158 sb->chunksize != refsb->chunksize) {
1159 printk(KERN_WARNING "md: %s has strangely different"
1160 " superblock to %s\n",
1161 bdevname(rdev->bdev,b),
1162 bdevname(refdev->bdev,b2));
1163 return -EINVAL;
1164 }
1165 ev1 = le64_to_cpu(sb->events);
1166 ev2 = le64_to_cpu(refsb->events);
1167
1168 if (ev1 > ev2)
8ed75463
N		 1169 ret = 1;
1170 else
1171 ret = 0;
1da177e4 1172 }
a1801f85 1173 if (minor_version)
1da177e4
LT		 1174 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1175 else
1176 rdev->size = rdev->sb_offset;
1177 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1178 return -EINVAL;
1179 rdev->size = le64_to_cpu(sb->data_size)/2;
1180 if (le32_to_cpu(sb->chunksize))
1181 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
2bf071bf 1182
1c05b4bc 1183 if (le64_to_cpu(sb->size) > rdev->size*2)
2bf071bf 1184 return -EINVAL;
8ed75463 1185 return ret;
1da177e4
LT		 1186}
1187
1188static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1189{
1190 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
07d84d10 1191 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4 1192
41158c7e 1193 rdev->raid_disk = -1;
c5d79adb
N		 1194 clear_bit(Faulty, &rdev->flags);
1195 clear_bit(In_sync, &rdev->flags);
1196 clear_bit(WriteMostly, &rdev->flags);
1197 clear_bit(BarriersNotsupp, &rdev->flags);
1198
1da177e4
LT		 1199 if (mddev->raid_disks == 0) {
1200 mddev->major_version = 1;
1201 mddev->patch_version = 0;
e691063a 1202 mddev->external = 0;
1da177e4
LT		 1203 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1204 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1205 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1206 mddev->level = le32_to_cpu(sb->level);
d9d166c2 1207 mddev->clevel[0] = 0;
1da177e4
LT		 1208 mddev->layout = le32_to_cpu(sb->layout);
1209 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1210 mddev->size = le64_to_cpu(sb->size)/2;
07d84d10 1211 mddev->events = ev1;
9223214e 1212 mddev->bitmap_offset = 0;
29fc7e3e 1213 mddev->default_bitmap_offset = 1024 >> 9;
1da177e4
LT		 1214
1215 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1216 memcpy(mddev->uuid, sb->set_uuid, 16);
1217
1218 mddev->max_disks = (4096-256)/2;
a654b9d8 1219
71c0805c 1220 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
e11e93fa 1221 mddev->bitmap_file == NULL )
a654b9d8 1222 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
e11e93fa 1223
f6705578
N		 1224 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1225 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1226 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1227 mddev->new_level = le32_to_cpu(sb->new_level);
1228 mddev->new_layout = le32_to_cpu(sb->new_layout);
1229 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1230 } else {
1231 mddev->reshape_position = MaxSector;
1232 mddev->delta_disks = 0;
1233 mddev->new_level = mddev->level;
1234 mddev->new_layout = mddev->layout;
1235 mddev->new_chunk = mddev->chunk_size;
1236 }
1237
41158c7e
N		 1238 } else if (mddev->pers == NULL) {
1239 /* Insist of good event counter while assembling */
1da177e4
LT		 1240 ++ev1;
1241 if (ev1 < mddev->events)
1242 return -EINVAL;
41158c7e
N		 1243 } else if (mddev->bitmap) {
1244 /* If adding to array with a bitmap, then we can accept an
1245 * older device, but not too old.
1246 */
41158c7e
N		 1247 if (ev1 < mddev->bitmap->events_cleared)
1248 return 0;
07d84d10
N		 1249 } else {
1250 if (ev1 < mddev->events)
1251 /* just a hot-add of a new device, leave raid_disk at -1 */
1252 return 0;
1253 }
1da177e4
LT		 1254 if (mddev->level != LEVEL_MULTIPATH) {
1255 int role;
1da177e4
LT		 1256 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1257 switch(role) {
1258 case 0xffff: /* spare */
1da177e4
LT		 1259 break;
1260 case 0xfffe: /* faulty */
b2d444d7 1261 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 1262 break;
1263 default:
5fd6c1dc
N		 1264 if ((le32_to_cpu(sb->feature_map) &
1265 MD_FEATURE_RECOVERY_OFFSET))
1266 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1267 else
1268 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1269 rdev->raid_disk = role;
1270 break;
1271 }
8ddf9efe
N		 1272 if (sb->devflags & WriteMostly1)
1273 set_bit(WriteMostly, &rdev->flags);
41158c7e 1274 } else /* MULTIPATH are always insync */
b2d444d7 1275 set_bit(In_sync, &rdev->flags);
41158c7e 1276
1da177e4
LT		 1277 return 0;
1278}
1279
1280static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1281{
1282 struct mdp_superblock_1 *sb;
1283 struct list_head *tmp;
1284 mdk_rdev_t *rdev2;
1285 int max_dev, i;
1286 /* make rdev->sb match mddev and rdev data. */
1287
1288 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1289
1290 sb->feature_map = 0;
1291 sb->pad0 = 0;
5fd6c1dc 1292 sb->recovery_offset = cpu_to_le64(0);
1da177e4
LT		 1293 memset(sb->pad1, 0, sizeof(sb->pad1));
1294 memset(sb->pad2, 0, sizeof(sb->pad2));
1295 memset(sb->pad3, 0, sizeof(sb->pad3));
1296
1297 sb->utime = cpu_to_le64((__u64)mddev->utime);
1298 sb->events = cpu_to_le64(mddev->events);
1299 if (mddev->in_sync)
1300 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1301 else
1302 sb->resync_offset = cpu_to_le64(0);
1303
1c05b4bc 1304 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
4dbcdc75 1305
f0ca340c 1306 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
29fc7e3e 1307 sb->size = cpu_to_le64(mddev->size<<1);
f0ca340c 1308
a654b9d8
N		 1309 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1310 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
71c0805c 1311 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8 1312 }
5fd6c1dc
N		 1313
1314 if (rdev->raid_disk >= 0 &&
1315 !test_bit(In_sync, &rdev->flags) &&
1316 rdev->recovery_offset > 0) {
1317 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1318 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1319 }
1320
f6705578
N		 1321 if (mddev->reshape_position != MaxSector) {
1322 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1323 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1324 sb->new_layout = cpu_to_le32(mddev->new_layout);
1325 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1326 sb->new_level = cpu_to_le32(mddev->new_level);
1327 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1328 }
a654b9d8 1329
1da177e4 1330 max_dev = 0;
d089c6af 1331 rdev_for_each(rdev2, tmp, mddev)
1da177e4
LT		 1332 if (rdev2->desc_nr+1 > max_dev)
1333 max_dev = rdev2->desc_nr+1;
a778b73f
N		 1334
1335 if (max_dev > le32_to_cpu(sb->max_dev))
1336 sb->max_dev = cpu_to_le32(max_dev);
1da177e4
LT		 1337 for (i=0; i<max_dev;i++)
1338 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1339
d089c6af 1340 rdev_for_each(rdev2, tmp, mddev) {
1da177e4 1341 i = rdev2->desc_nr;
b2d444d7 1342 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1343 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1344 else if (test_bit(In_sync, &rdev2->flags))
1da177e4 1345 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
5fd6c1dc
N		 1346 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1347 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1da177e4
LT		 1348 else
1349 sb->dev_roles[i] = cpu_to_le16(0xffff);
1350 }
1351
1da177e4
LT		 1352 sb->sb_csum = calc_sb_1_csum(sb);
1353}
1354
0cd17fec
CW		 1355static unsigned long long
1356super_1_rdev_size_change(mdk_rdev_t *rdev, unsigned long long size)
1357{
1358 struct mdp_superblock_1 *sb;
1359 unsigned long long max_size;
1360 if (size && size < rdev->mddev->size)
1361 return 0; /* component must fit device */
1362 size *= 2; /* convert to sectors */
1363 if (rdev->sb_offset < rdev->data_offset/2) {
1364 /* minor versions 1 and 2; superblock before data */
1365 max_size = (rdev->bdev->bd_inode->i_size >> 9);
1366 max_size -= rdev->data_offset;
1367 if (!size || size > max_size)
1368 size = max_size;
1369 } else if (rdev->mddev->bitmap_offset) {
1370 /* minor version 0 with bitmap we can't move */
1371 return 0;
1372 } else {
1373 /* minor version 0; superblock after data */
1374 sector_t sb_offset;
1375 sb_offset = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1376 sb_offset &= ~(sector_t)(4*2 - 1);
1377 max_size = rdev->size*2 + sb_offset - rdev->sb_offset*2;
1378 if (!size || size > max_size)
1379 size = max_size;
1380 rdev->sb_offset = sb_offset/2;
1381 }
1382 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1383 sb->data_size = cpu_to_le64(size);
1384 sb->super_offset = rdev->sb_offset*2;
1385 sb->sb_csum = calc_sb_1_csum(sb);
1386 md_super_write(rdev->mddev, rdev, rdev->sb_offset << 1, rdev->sb_size,
1387 rdev->sb_page);
1388 md_super_wait(rdev->mddev);
1389 return size/2; /* kB for sysfs */
1390}
1da177e4 1391
75c96f85 1392static struct super_type super_types[] = {
1da177e4
LT		 1393 [0] = {
1394 .name = "0.90.0",
1395 .owner = THIS_MODULE,
0cd17fec
CW		 1396 .load_super = super_90_load,
1397 .validate_super = super_90_validate,
1398 .sync_super = super_90_sync,
1399 .rdev_size_change = super_90_rdev_size_change,
1da177e4
LT		 1400 },
1401 [1] = {
1402 .name = "md-1",
1403 .owner = THIS_MODULE,
0cd17fec
CW		 1404 .load_super = super_1_load,
1405 .validate_super = super_1_validate,
1406 .sync_super = super_1_sync,
1407 .rdev_size_change = super_1_rdev_size_change,
1da177e4
LT		 1408 },
1409};
1da177e4
LT		 1410
1411static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1412{
7dd5e7c3
N		 1413 struct list_head *tmp, *tmp2;
1414 mdk_rdev_t *rdev, *rdev2;
1da177e4 1415
d089c6af
N		 1416 rdev_for_each(rdev, tmp, mddev1)
1417 rdev_for_each(rdev2, tmp2, mddev2)
7dd5e7c3
N		 1418 if (rdev->bdev->bd_contains ==
1419 rdev2->bdev->bd_contains)
1420 return 1;
1da177e4
LT		 1421
1422 return 0;
1423}
1424
1425static LIST_HEAD(pending_raid_disks);
1426
1427static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1428{
7dd5e7c3 1429 char b[BDEVNAME_SIZE];
f637b9f9 1430 struct kobject *ko;
1edf80d3 1431 char *s;
5e55e2f5 1432 int err;
1da177e4
LT		 1433
1434 if (rdev->mddev) {
1435 MD_BUG();
1436 return -EINVAL;
1437 }
11e2ede0
DW		 1438
1439 /* prevent duplicates */
1440 if (find_rdev(mddev, rdev->bdev->bd_dev))
1441 return -EEXIST;
1442
2bf071bf
N		 1443 /* make sure rdev->size exceeds mddev->size */
1444 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
a778b73f
N		 1445 if (mddev->pers) {
1446 /* Cannot change size, so fail
1447 * If mddev->level <= 0, then we don't care
1448 * about aligning sizes (e.g. linear)
1449 */
1450 if (mddev->level > 0)
1451 return -ENOSPC;
1452 } else
2bf071bf
N		 1453 mddev->size = rdev->size;
1454 }
1da177e4
LT		 1455
1456 /* Verify rdev->desc_nr is unique.
1457 * If it is -1, assign a free number, else
1458 * check number is not in use
1459 */
1460 if (rdev->desc_nr < 0) {
1461 int choice = 0;
1462 if (mddev->pers) choice = mddev->raid_disks;
1463 while (find_rdev_nr(mddev, choice))
1464 choice++;
1465 rdev->desc_nr = choice;
1466 } else {
1467 if (find_rdev_nr(mddev, rdev->desc_nr))
1468 return -EBUSY;
1469 }
19133a42 1470 bdevname(rdev->bdev,b);
649316b2 1471 while ( (s=strchr(b, '/')) != NULL)
1edf80d3 1472 *s = '!';
649316b2 1473
1da177e4 1474 rdev->mddev = mddev;
19133a42 1475 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 1476
b2d6db58 1477 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
5e55e2f5 1478 goto fail;
86e6ffdd 1479
f637b9f9 1480 if (rdev->bdev->bd_part)
edfaa7c3 1481 ko = &rdev->bdev->bd_part->dev.kobj;
f637b9f9 1482 else
edfaa7c3 1483 ko = &rdev->bdev->bd_disk->dev.kobj;
5e55e2f5
N		 1484 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1485 kobject_del(&rdev->kobj);
1486 goto fail;
1487 }
1488 list_add(&rdev->same_set, &mddev->disks);
c5d79adb 1489 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1da177e4 1490 return 0;
5e55e2f5
N		 1491
1492 fail:
1493 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1494 b, mdname(mddev));
1495 return err;
1da177e4
LT		 1496}
1497
177a99b2 1498static void md_delayed_delete(struct work_struct *ws)
5792a285
N		 1499{
1500 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1501 kobject_del(&rdev->kobj);
177a99b2 1502 kobject_put(&rdev->kobj);
5792a285
N		 1503}
1504
1da177e4
LT		 1505static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1506{
1507 char b[BDEVNAME_SIZE];
1508 if (!rdev->mddev) {
1509 MD_BUG();
1510 return;
1511 }
5463c790 1512 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1da177e4
LT		 1513 list_del_init(&rdev->same_set);
1514 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1515 rdev->mddev = NULL;
86e6ffdd 1516 sysfs_remove_link(&rdev->kobj, "block");
5792a285
N		 1517
1518 /* We need to delay this, otherwise we can deadlock when
1519 * writing to 'remove' to "dev/state"
1520 */
177a99b2
N		 1521 INIT_WORK(&rdev->del_work, md_delayed_delete);
1522 kobject_get(&rdev->kobj);
5792a285 1523 schedule_work(&rdev->del_work);
1da177e4
LT		 1524}
1525
1526/*
1527 * prevent the device from being mounted, repartitioned or
1528 * otherwise reused by a RAID array (or any other kernel
1529 * subsystem), by bd_claiming the device.
1530 */
c5d79adb 1531static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1da177e4
LT		 1532{
1533 int err = 0;
1534 struct block_device *bdev;
1535 char b[BDEVNAME_SIZE];
1536
2e7b651d 1537 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1da177e4
LT		 1538 if (IS_ERR(bdev)) {
1539 printk(KERN_ERR "md: could not open %s.\n",
1540 __bdevname(dev, b));
1541 return PTR_ERR(bdev);
1542 }
c5d79adb 1543 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1da177e4
LT		 1544 if (err) {
1545 printk(KERN_ERR "md: could not bd_claim %s.\n",
1546 bdevname(bdev, b));
2e7b651d 1547 blkdev_put(bdev);
1da177e4
LT		 1548 return err;
1549 }
c5d79adb
N		 1550 if (!shared)
1551 set_bit(AllReserved, &rdev->flags);
1da177e4
LT		 1552 rdev->bdev = bdev;
1553 return err;
1554}
1555
1556static void unlock_rdev(mdk_rdev_t *rdev)
1557{
1558 struct block_device *bdev = rdev->bdev;
1559 rdev->bdev = NULL;
1560 if (!bdev)
1561 MD_BUG();
1562 bd_release(bdev);
2e7b651d 1563 blkdev_put(bdev);
1da177e4
LT		 1564}
1565
1566void md_autodetect_dev(dev_t dev);
1567
1568static void export_rdev(mdk_rdev_t * rdev)
1569{
1570 char b[BDEVNAME_SIZE];
1571 printk(KERN_INFO "md: export_rdev(%s)\n",
1572 bdevname(rdev->bdev,b));
1573 if (rdev->mddev)
1574 MD_BUG();
1575 free_disk_sb(rdev);
1576 list_del_init(&rdev->same_set);
1577#ifndef MODULE
d0fae18f
N		 1578 if (test_bit(AutoDetected, &rdev->flags))
1579 md_autodetect_dev(rdev->bdev->bd_dev);
1da177e4
LT		 1580#endif
1581 unlock_rdev(rdev);
86e6ffdd 1582 kobject_put(&rdev->kobj);
1da177e4
LT		 1583}
1584
1585static void kick_rdev_from_array(mdk_rdev_t * rdev)
1586{
1587 unbind_rdev_from_array(rdev);
1588 export_rdev(rdev);
1589}
1590
1591static void export_array(mddev_t *mddev)
1592{
1593 struct list_head *tmp;
1594 mdk_rdev_t *rdev;
1595
d089c6af 1596 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 1597 if (!rdev->mddev) {
1598 MD_BUG();
1599 continue;
1600 }
1601 kick_rdev_from_array(rdev);
1602 }
1603 if (!list_empty(&mddev->disks))
1604 MD_BUG();
1605 mddev->raid_disks = 0;
1606 mddev->major_version = 0;
1607}
1608
1609static void print_desc(mdp_disk_t *desc)
1610{
1611 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1612 desc->major,desc->minor,desc->raid_disk,desc->state);
1613}
1614
1615static void print_sb(mdp_super_t *sb)
1616{
1617 int i;
1618
1619 printk(KERN_INFO
1620 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1621 sb->major_version, sb->minor_version, sb->patch_version,
1622 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1623 sb->ctime);
1624 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1625 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1626 sb->md_minor, sb->layout, sb->chunk_size);
1627 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1628 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1629 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1630 sb->failed_disks, sb->spare_disks,
1631 sb->sb_csum, (unsigned long)sb->events_lo);
1632
1633 printk(KERN_INFO);
1634 for (i = 0; i < MD_SB_DISKS; i++) {
1635 mdp_disk_t *desc;
1636
1637 desc = sb->disks + i;
1638 if (desc->number || desc->major || desc->minor ||
1639 desc->raid_disk || (desc->state && (desc->state != 4))) {
1640 printk(" D %2d: ", i);
1641 print_desc(desc);
1642 }
1643 }
1644 printk(KERN_INFO "md: THIS: ");
1645 print_desc(&sb->this_disk);
1646
1647}
1648
1649static void print_rdev(mdk_rdev_t *rdev)
1650{
1651 char b[BDEVNAME_SIZE];
1652 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1653 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
b2d444d7
N		 1654 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1655 rdev->desc_nr);
1da177e4
LT		 1656 if (rdev->sb_loaded) {
1657 printk(KERN_INFO "md: rdev superblock:\n");
1658 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1659 } else
1660 printk(KERN_INFO "md: no rdev superblock!\n");
1661}
1662
5e56341d 1663static void md_print_devices(void)
1da177e4
LT		 1664{
1665 struct list_head *tmp, *tmp2;
1666 mdk_rdev_t *rdev;
1667 mddev_t *mddev;
1668 char b[BDEVNAME_SIZE];
1669
1670 printk("\n");
1671 printk("md: **********************************\n");
1672 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1673 printk("md: **********************************\n");
29ac4aa3 1674 for_each_mddev(mddev, tmp) {
1da177e4 1675
32a7627c
N		 1676 if (mddev->bitmap)
1677 bitmap_print_sb(mddev->bitmap);
1678 else
1679 printk("%s: ", mdname(mddev));
d089c6af 1680 rdev_for_each(rdev, tmp2, mddev)
1da177e4
LT		 1681 printk("<%s>", bdevname(rdev->bdev,b));
1682 printk("\n");
1683
d089c6af 1684 rdev_for_each(rdev, tmp2, mddev)
1da177e4
LT		 1685 print_rdev(rdev);
1686 }
1687 printk("md: **********************************\n");
1688 printk("\n");
1689}
1690
1691
42543769 1692static void sync_sbs(mddev_t * mddev, int nospares)
1da177e4 1693{
42543769
N		 1694 /* Update each superblock (in-memory image), but
1695 * if we are allowed to, skip spares which already
1696 * have the right event counter, or have one earlier
1697 * (which would mean they aren't being marked as dirty
1698 * with the rest of the array)
1699 */
1da177e4
LT		 1700 mdk_rdev_t *rdev;
1701 struct list_head *tmp;
1702
d089c6af 1703 rdev_for_each(rdev, tmp, mddev) {
42543769
N		 1704 if (rdev->sb_events == mddev->events ||
1705 (nospares &&
1706 rdev->raid_disk < 0 &&
1707 (rdev->sb_events&1)==0 &&
1708 rdev->sb_events+1 == mddev->events)) {
1709 /* Don't update this superblock */
1710 rdev->sb_loaded = 2;
1711 } else {
1712 super_types[mddev->major_version].
1713 sync_super(mddev, rdev);
1714 rdev->sb_loaded = 1;
1715 }
1da177e4
LT		 1716 }
1717}
1718
850b2b42 1719static void md_update_sb(mddev_t * mddev, int force_change)
1da177e4 1720{
1da177e4
LT		 1721 struct list_head *tmp;
1722 mdk_rdev_t *rdev;
06d91a5f 1723 int sync_req;
42543769 1724 int nospares = 0;
1da177e4 1725
8377bc80
N		 1726 if (mddev->external)
1727 return;
1da177e4 1728repeat:
a9701a30 1729 spin_lock_irq(&mddev->write_lock);
84692195 1730
850b2b42
N		 1731 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1732 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1733 force_change = 1;
1734 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1735 /* just a clean<-> dirty transition, possibly leave spares alone,
1736 * though if events isn't the right even/odd, we will have to do
1737 * spares after all
1738 */
1739 nospares = 1;
1740 if (force_change)
1741 nospares = 0;
1742 if (mddev->degraded)
84692195
N		 1743 /* If the array is degraded, then skipping spares is both
1744 * dangerous and fairly pointless.
1745 * Dangerous because a device that was removed from the array
1746 * might have a event_count that still looks up-to-date,
1747 * so it can be re-added without a resync.
1748 * Pointless because if there are any spares to skip,
1749 * then a recovery will happen and soon that array won't
1750 * be degraded any more and the spare can go back to sleep then.
1751 */
850b2b42 1752 nospares = 0;
84692195 1753
06d91a5f 1754 sync_req = mddev->in_sync;
1da177e4 1755 mddev->utime = get_seconds();
42543769
N		 1756
1757 /* If this is just a dirty<->clean transition, and the array is clean
1758 * and 'events' is odd, we can roll back to the previous clean state */
850b2b42 1759 if (nospares
42543769 1760 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1031be7a
N		 1761 && (mddev->events & 1)
1762 && mddev->events != 1)
42543769
N		 1763 mddev->events--;
1764 else {
1765 /* otherwise we have to go forward and ... */
1766 mddev->events ++;
1767 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1768 /* .. if the array isn't clean, insist on an odd 'events' */
1769 if ((mddev->events&1)==0) {
1770 mddev->events++;
1771 nospares = 0;
1772 }
1773 } else {
1774 /* otherwise insist on an even 'events' (for clean states) */
1775 if ((mddev->events&1)) {
1776 mddev->events++;
1777 nospares = 0;
1778 }
1779 }
1780 }
1da177e4
LT		 1781
1782 if (!mddev->events) {
1783 /*
1784 * oops, this 64-bit counter should never wrap.
1785 * Either we are in around ~1 trillion A.C., assuming
1786 * 1 reboot per second, or we have a bug:
1787 */
1788 MD_BUG();
1789 mddev->events --;
1790 }
1da177e4
LT		 1791
1792 /*
1793 * do not write anything to disk if using
1794 * nonpersistent superblocks
1795 */
06d91a5f 1796 if (!mddev->persistent) {
e691063a
N		 1797 if (!mddev->external)
1798 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1799
a9701a30 1800 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1801 wake_up(&mddev->sb_wait);
1da177e4 1802 return;
06d91a5f 1803 }
e691063a 1804 sync_sbs(mddev, nospares);
a9701a30 1805 spin_unlock_irq(&mddev->write_lock);
1da177e4
LT		 1806
1807 dprintk(KERN_INFO
1808 "md: updating %s RAID superblock on device (in sync %d)\n",
1809 mdname(mddev),mddev->in_sync);
1810
4ad13663 1811 bitmap_update_sb(mddev->bitmap);
d089c6af 1812 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 1813 char b[BDEVNAME_SIZE];
1814 dprintk(KERN_INFO "md: ");
42543769
N		 1815 if (rdev->sb_loaded != 1)
1816 continue; /* no noise on spare devices */
b2d444d7 1817 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1818 dprintk("(skipping faulty ");
1819
1820 dprintk("%s ", bdevname(rdev->bdev,b));
b2d444d7 1821 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 1822 md_super_write(mddev,rdev,
0002b271 1823 rdev->sb_offset<<1, rdev->sb_size,
7bfa19f2
N		 1824 rdev->sb_page);
1825 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1826 bdevname(rdev->bdev,b),
1827 (unsigned long long)rdev->sb_offset);
42543769 1828 rdev->sb_events = mddev->events;
7bfa19f2 1829
1da177e4
LT		 1830 } else
1831 dprintk(")\n");
7bfa19f2 1832 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT		 1833 /* only need to write one superblock... */
1834 break;
1835 }
a9701a30 1836 md_super_wait(mddev);
850b2b42 1837 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
7bfa19f2 1838
a9701a30 1839 spin_lock_irq(&mddev->write_lock);
850b2b42
N		 1840 if (mddev->in_sync != sync_req ||
1841 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
06d91a5f 1842 /* have to write it out again */
a9701a30 1843 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N		 1844 goto repeat;
1845 }
850b2b42 1846 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
a9701a30 1847 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1848 wake_up(&mddev->sb_wait);
06d91a5f 1849
1da177e4
LT		 1850}
1851
bce74dac
N		 1852/* words written to sysfs files may, or my not, be \n terminated.
1853 * We want to accept with case. For this we use cmd_match.
1854 */
1855static int cmd_match(const char *cmd, const char *str)
1856{
1857 /* See if cmd, written into a sysfs file, matches
1858 * str. They must either be the same, or cmd can
1859 * have a trailing newline
1860 */
1861 while (*cmd && *str && *cmd == *str) {
1862 cmd++;
1863 str++;
1864 }
1865 if (*cmd == '\n')
1866 cmd++;
1867 if (*str || *cmd)
1868 return 0;
1869 return 1;
1870}
1871
86e6ffdd
N		 1872struct rdev_sysfs_entry {
1873 struct attribute attr;
1874 ssize_t (*show)(mdk_rdev_t *, char *);
1875 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1876};
1877
1878static ssize_t
96de1e66 1879state_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1880{
1881 char *sep = "";
20a49ff6 1882 size_t len = 0;
86e6ffdd 1883
b2d444d7 1884 if (test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 1885 len+= sprintf(page+len, "%sfaulty",sep);
1886 sep = ",";
1887 }
b2d444d7 1888 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1889 len += sprintf(page+len, "%sin_sync",sep);
1890 sep = ",";
1891 }
f655675b
N		 1892 if (test_bit(WriteMostly, &rdev->flags)) {
1893 len += sprintf(page+len, "%swrite_mostly",sep);
1894 sep = ",";
1895 }
6bfe0b49
DW		 1896 if (test_bit(Blocked, &rdev->flags)) {
1897 len += sprintf(page+len, "%sblocked", sep);
1898 sep = ",";
1899 }
b2d444d7
N		 1900 if (!test_bit(Faulty, &rdev->flags) &&
1901 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1902 len += sprintf(page+len, "%sspare", sep);
1903 sep = ",";
1904 }
1905 return len+sprintf(page+len, "\n");
1906}
1907
45dc2de1
N		 1908static ssize_t
1909state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1910{
1911 /* can write
1912 * faulty - simulates and error
1913 * remove - disconnects the device
f655675b
N		 1914 * writemostly - sets write_mostly
1915 * -writemostly - clears write_mostly
6bfe0b49
DW		 1916 * blocked - sets the Blocked flag
1917 * -blocked - clears the Blocked flag
45dc2de1
N		 1918 */
1919 int err = -EINVAL;
1920 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1921 md_error(rdev->mddev, rdev);
1922 err = 0;
1923 } else if (cmd_match(buf, "remove")) {
1924 if (rdev->raid_disk >= 0)
1925 err = -EBUSY;
1926 else {
1927 mddev_t *mddev = rdev->mddev;
1928 kick_rdev_from_array(rdev);
3f9d7b0d
N		 1929 if (mddev->pers)
1930 md_update_sb(mddev, 1);
45dc2de1
N		 1931 md_new_event(mddev);
1932 err = 0;
1933 }
f655675b
N		 1934 } else if (cmd_match(buf, "writemostly")) {
1935 set_bit(WriteMostly, &rdev->flags);
1936 err = 0;
1937 } else if (cmd_match(buf, "-writemostly")) {
1938 clear_bit(WriteMostly, &rdev->flags);
6bfe0b49
DW		 1939 err = 0;
1940 } else if (cmd_match(buf, "blocked")) {
1941 set_bit(Blocked, &rdev->flags);
1942 err = 0;
1943 } else if (cmd_match(buf, "-blocked")) {
1944 clear_bit(Blocked, &rdev->flags);
1945 wake_up(&rdev->blocked_wait);
1946 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
1947 md_wakeup_thread(rdev->mddev->thread);
1948
f655675b 1949 err = 0;
45dc2de1 1950 }
52664732
NB		 1951 if (!err)
1952 sysfs_notify(&rdev->kobj, NULL, "state");
45dc2de1
N		 1953 return err ? err : len;
1954}
80ca3a44
N		 1955static struct rdev_sysfs_entry rdev_state =
1956__ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
86e6ffdd 1957
4dbcdc75
N		 1958static ssize_t
1959errors_show(mdk_rdev_t *rdev, char *page)
1960{
1961 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1962}
1963
1964static ssize_t
1965errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1966{
1967 char *e;
1968 unsigned long n = simple_strtoul(buf, &e, 10);
1969 if (*buf && (*e == 0 || *e == '\n')) {
1970 atomic_set(&rdev->corrected_errors, n);
1971 return len;
1972 }
1973 return -EINVAL;
1974}
1975static struct rdev_sysfs_entry rdev_errors =
80ca3a44 1976__ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
4dbcdc75 1977
014236d2
N		 1978static ssize_t
1979slot_show(mdk_rdev_t *rdev, char *page)
1980{
1981 if (rdev->raid_disk < 0)
1982 return sprintf(page, "none\n");
1983 else
1984 return sprintf(page, "%d\n", rdev->raid_disk);
1985}
1986
1987static ssize_t
1988slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1989{
1990 char *e;
c303da6d
N		 1991 int err;
1992 char nm[20];
014236d2
N		 1993 int slot = simple_strtoul(buf, &e, 10);
1994 if (strncmp(buf, "none", 4)==0)
1995 slot = -1;
1996 else if (e==buf || (*e && *e!= '\n'))
1997 return -EINVAL;
6c2fce2e 1998 if (rdev->mddev->pers && slot == -1) {
c303da6d
N		 1999 /* Setting 'slot' on an active array requires also
2000 * updating the 'rd%d' link, and communicating
2001 * with the personality with ->hot_*_disk.
2002 * For now we only support removing
2003 * failed/spare devices. This normally happens automatically,
2004 * but not when the metadata is externally managed.
2005 */
c303da6d
N		 2006 if (rdev->raid_disk == -1)
2007 return -EEXIST;
2008 /* personality does all needed checks */
2009 if (rdev->mddev->pers->hot_add_disk == NULL)
2010 return -EINVAL;
2011 err = rdev->mddev->pers->
2012 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2013 if (err)
2014 return err;
2015 sprintf(nm, "rd%d", rdev->raid_disk);
2016 sysfs_remove_link(&rdev->mddev->kobj, nm);
2017 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2018 md_wakeup_thread(rdev->mddev->thread);
6c2fce2e
NB		 2019 } else if (rdev->mddev->pers) {
2020 mdk_rdev_t *rdev2;
2021 struct list_head *tmp;
2022 /* Activating a spare .. or possibly reactivating
2023 * if we every get bitmaps working here.
2024 */
2025
2026 if (rdev->raid_disk != -1)
2027 return -EBUSY;
2028
2029 if (rdev->mddev->pers->hot_add_disk == NULL)
2030 return -EINVAL;
2031
2032 rdev_for_each(rdev2, tmp, rdev->mddev)
2033 if (rdev2->raid_disk == slot)
2034 return -EEXIST;
2035
2036 rdev->raid_disk = slot;
2037 if (test_bit(In_sync, &rdev->flags))
2038 rdev->saved_raid_disk = slot;
2039 else
2040 rdev->saved_raid_disk = -1;
2041 err = rdev->mddev->pers->
2042 hot_add_disk(rdev->mddev, rdev);
199050ea 2043 if (err) {
6c2fce2e 2044 rdev->raid_disk = -1;
6c2fce2e 2045 return err;
52664732
NB		 2046 } else
2047 sysfs_notify(&rdev->kobj, NULL, "state");
6c2fce2e
NB		 2048 sprintf(nm, "rd%d", rdev->raid_disk);
2049 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2050 printk(KERN_WARNING
2051 "md: cannot register "
2052 "%s for %s\n",
2053 nm, mdname(rdev->mddev));
2054
2055 /* don't wakeup anyone, leave that to userspace. */
c303da6d
N		 2056 } else {
2057 if (slot >= rdev->mddev->raid_disks)
2058 return -ENOSPC;
2059 rdev->raid_disk = slot;
2060 /* assume it is working */
c5d79adb
N		 2061 clear_bit(Faulty, &rdev->flags);
2062 clear_bit(WriteMostly, &rdev->flags);
c303da6d 2063 set_bit(In_sync, &rdev->flags);
52664732 2064 sysfs_notify(&rdev->kobj, NULL, "state");
c303da6d 2065 }
014236d2
N		 2066 return len;
2067}
2068
2069
2070static struct rdev_sysfs_entry rdev_slot =
80ca3a44 2071__ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
014236d2 2072
93c8cad0
N		 2073static ssize_t
2074offset_show(mdk_rdev_t *rdev, char *page)
2075{
6961ece4 2076 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
93c8cad0
N		 2077}
2078
2079static ssize_t
2080offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2081{
2082 char *e;
2083 unsigned long long offset = simple_strtoull(buf, &e, 10);
2084 if (e==buf || (*e && *e != '\n'))
2085 return -EINVAL;
8ed0a521 2086 if (rdev->mddev->pers && rdev->raid_disk >= 0)
93c8cad0 2087 return -EBUSY;
c5d79adb
N		 2088 if (rdev->size && rdev->mddev->external)
2089 /* Must set offset before size, so overlap checks
2090 * can be sane */
2091 return -EBUSY;
93c8cad0
N		 2092 rdev->data_offset = offset;
2093 return len;
2094}
2095
2096static struct rdev_sysfs_entry rdev_offset =
80ca3a44 2097__ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
93c8cad0 2098
83303b61
N		 2099static ssize_t
2100rdev_size_show(mdk_rdev_t *rdev, char *page)
2101{
2102 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
2103}
2104
c5d79adb
N		 2105static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2106{
2107 /* check if two start/length pairs overlap */
2108 if (s1+l1 <= s2)
2109 return 0;
2110 if (s2+l2 <= s1)
2111 return 0;
2112 return 1;
2113}
2114
83303b61
N		 2115static ssize_t
2116rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2117{
2118 char *e;
2119 unsigned long long size = simple_strtoull(buf, &e, 10);
c5d79adb 2120 unsigned long long oldsize = rdev->size;
27c529bb
N		 2121 mddev_t *my_mddev = rdev->mddev;
2122
83303b61
N		 2123 if (e==buf || (*e && *e != '\n'))
2124 return -EINVAL;
0cd17fec
CW		 2125 if (my_mddev->pers && rdev->raid_disk >= 0) {
2126 if (rdev->mddev->persistent) {
2127 size = super_types[rdev->mddev->major_version].
2128 rdev_size_change(rdev, size);
2129 if (!size)
2130 return -EBUSY;
2131 } else if (!size) {
2132 size = (rdev->bdev->bd_inode->i_size >> 10);
2133 size -= rdev->data_offset/2;
2134 }
2135 if (size < rdev->mddev->size)
2136 return -EINVAL; /* component must fit device */
2137 }
2138
83303b61 2139 rdev->size = size;
c5d79adb
N		 2140 if (size > oldsize && rdev->mddev->external) {
2141 /* need to check that all other rdevs with the same ->bdev
2142 * do not overlap. We need to unlock the mddev to avoid
2143 * a deadlock. We have already changed rdev->size, and if
2144 * we have to change it back, we will have the lock again.
2145 */
2146 mddev_t *mddev;
2147 int overlap = 0;
2148 struct list_head *tmp, *tmp2;
2149
27c529bb 2150 mddev_unlock(my_mddev);
29ac4aa3 2151 for_each_mddev(mddev, tmp) {
c5d79adb
N		 2152 mdk_rdev_t *rdev2;
2153
2154 mddev_lock(mddev);
d089c6af 2155 rdev_for_each(rdev2, tmp2, mddev)
c5d79adb
N		 2156 if (test_bit(AllReserved, &rdev2->flags) ||
2157 (rdev->bdev == rdev2->bdev &&
2158 rdev != rdev2 &&
2159 overlaps(rdev->data_offset, rdev->size,
2160 rdev2->data_offset, rdev2->size))) {
2161 overlap = 1;
2162 break;
2163 }
2164 mddev_unlock(mddev);
2165 if (overlap) {
2166 mddev_put(mddev);
2167 break;
2168 }
2169 }
27c529bb 2170 mddev_lock(my_mddev);
c5d79adb
N		 2171 if (overlap) {
2172 /* Someone else could have slipped in a size
2173 * change here, but doing so is just silly.
2174 * We put oldsize back because we *know* it is
2175 * safe, and trust userspace not to race with
2176 * itself
2177 */
2178 rdev->size = oldsize;
2179 return -EBUSY;
2180 }
2181 }
27c529bb
N		 2182 if (size < my_mddev->size || my_mddev->size == 0)
2183 my_mddev->size = size;
83303b61
N		 2184 return len;
2185}
2186
2187static struct rdev_sysfs_entry rdev_size =
80ca3a44 2188__ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
83303b61 2189
86e6ffdd
N		 2190static struct attribute *rdev_default_attrs[] = {
2191 &rdev_state.attr,
4dbcdc75 2192 &rdev_errors.attr,
014236d2 2193 &rdev_slot.attr,
93c8cad0 2194 &rdev_offset.attr,
83303b61 2195 &rdev_size.attr,
86e6ffdd
N		 2196 NULL,
2197};
2198static ssize_t
2199rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2200{
2201 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2202 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
27c529bb
N		 2203 mddev_t *mddev = rdev->mddev;
2204 ssize_t rv;
86e6ffdd
N		 2205
2206 if (!entry->show)
2207 return -EIO;
27c529bb
N		 2208
2209 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2210 if (!rv) {
2211 if (rdev->mddev == NULL)
2212 rv = -EBUSY;
2213 else
2214 rv = entry->show(rdev, page);
2215 mddev_unlock(mddev);
2216 }
2217 return rv;
86e6ffdd
N		 2218}
2219
2220static ssize_t
2221rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2222 const char *page, size_t length)
2223{
2224 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2225 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
27c529bb
N		 2226 ssize_t rv;
2227 mddev_t *mddev = rdev->mddev;
86e6ffdd
N		 2228
2229 if (!entry->store)
2230 return -EIO;
67463acb
N		 2231 if (!capable(CAP_SYS_ADMIN))
2232 return -EACCES;
27c529bb 2233 rv = mddev ? mddev_lock(mddev): -EBUSY;
ca388059 2234 if (!rv) {
27c529bb
N		 2235 if (rdev->mddev == NULL)
2236 rv = -EBUSY;
2237 else
2238 rv = entry->store(rdev, page, length);
6a51830e 2239 mddev_unlock(mddev);
ca388059
N		 2240 }
2241 return rv;
86e6ffdd
N		 2242}
2243
2244static void rdev_free(struct kobject *ko)
2245{
2246 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2247 kfree(rdev);
2248}
2249static struct sysfs_ops rdev_sysfs_ops = {
2250 .show = rdev_attr_show,
2251 .store = rdev_attr_store,
2252};
2253static struct kobj_type rdev_ktype = {
2254 .release = rdev_free,
2255 .sysfs_ops = &rdev_sysfs_ops,
2256 .default_attrs = rdev_default_attrs,
2257};
2258
1da177e4
LT		 2259/*
2260 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2261 *
2262 * mark the device faulty if:
2263 *
2264 * - the device is nonexistent (zero size)
2265 * - the device has no valid superblock
2266 *
2267 * a faulty rdev _never_ has rdev->sb set.
2268 */
2269static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2270{
2271 char b[BDEVNAME_SIZE];
2272 int err;
2273 mdk_rdev_t *rdev;
2274 sector_t size;
2275
9ffae0cf 2276 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1da177e4
LT		 2277 if (!rdev) {
2278 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2279 return ERR_PTR(-ENOMEM);
2280 }
1da177e4
LT		 2281
2282 if ((err = alloc_disk_sb(rdev)))
2283 goto abort_free;
2284
c5d79adb 2285 err = lock_rdev(rdev, newdev, super_format == -2);
1da177e4
LT		 2286 if (err)
2287 goto abort_free;
2288
f9cb074b 2289 kobject_init(&rdev->kobj, &rdev_ktype);
86e6ffdd 2290
1da177e4 2291 rdev->desc_nr = -1;
2b6e8459 2292 rdev->saved_raid_disk = -1;
3f9d7b0d 2293 rdev->raid_disk = -1;
b2d444d7 2294 rdev->flags = 0;
1da177e4 2295 rdev->data_offset = 0;
42543769 2296 rdev->sb_events = 0;
1da177e4 2297 atomic_set(&rdev->nr_pending, 0);
ba22dcbf 2298 atomic_set(&rdev->read_errors, 0);
4dbcdc75 2299 atomic_set(&rdev->corrected_errors, 0);
1da177e4
LT		 2300
2301 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2302 if (!size) {
2303 printk(KERN_WARNING
2304 "md: %s has zero or unknown size, marking faulty!\n",
2305 bdevname(rdev->bdev,b));
2306 err = -EINVAL;
2307 goto abort_free;
2308 }
2309
2310 if (super_format >= 0) {
2311 err = super_types[super_format].
2312 load_super(rdev, NULL, super_minor);
2313 if (err == -EINVAL) {
df968c4e
N		 2314 printk(KERN_WARNING
2315 "md: %s does not have a valid v%d.%d "
2316 "superblock, not importing!\n",
2317 bdevname(rdev->bdev,b),
2318 super_format, super_minor);
1da177e4
LT		 2319 goto abort_free;
2320 }
2321 if (err < 0) {
2322 printk(KERN_WARNING
2323 "md: could not read %s's sb, not importing!\n",
2324 bdevname(rdev->bdev,b));
2325 goto abort_free;
2326 }
2327 }
6bfe0b49 2328
1da177e4 2329 INIT_LIST_HEAD(&rdev->same_set);
6bfe0b49 2330 init_waitqueue_head(&rdev->blocked_wait);
1da177e4
LT		 2331
2332 return rdev;
2333
2334abort_free:
2335 if (rdev->sb_page) {
2336 if (rdev->bdev)
2337 unlock_rdev(rdev);
2338 free_disk_sb(rdev);
2339 }
2340 kfree(rdev);
2341 return ERR_PTR(err);
2342}
2343
2344/*
2345 * Check a full RAID array for plausibility
2346 */
2347
2348
a757e64c 2349static void analyze_sbs(mddev_t * mddev)
1da177e4
LT		 2350{
2351 int i;
2352 struct list_head *tmp;
2353 mdk_rdev_t *rdev, *freshest;
2354 char b[BDEVNAME_SIZE];
2355
2356 freshest = NULL;
d089c6af 2357 rdev_for_each(rdev, tmp, mddev)
1da177e4
LT		 2358 switch (super_types[mddev->major_version].
2359 load_super(rdev, freshest, mddev->minor_version)) {
2360 case 1:
2361 freshest = rdev;
2362 break;
2363 case 0:
2364 break;
2365 default:
2366 printk( KERN_ERR \
2367 "md: fatal superblock inconsistency in %s"
2368 " -- removing from array\n",
2369 bdevname(rdev->bdev,b));
2370 kick_rdev_from_array(rdev);
2371 }
2372
2373
2374 super_types[mddev->major_version].
2375 validate_super(mddev, freshest);
2376
2377 i = 0;
d089c6af 2378 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 2379 if (rdev != freshest)
2380 if (super_types[mddev->major_version].
2381 validate_super(mddev, rdev)) {
2382 printk(KERN_WARNING "md: kicking non-fresh %s"
2383 " from array!\n",
2384 bdevname(rdev->bdev,b));
2385 kick_rdev_from_array(rdev);
2386 continue;
2387 }
2388 if (mddev->level == LEVEL_MULTIPATH) {
2389 rdev->desc_nr = i++;
2390 rdev->raid_disk = rdev->desc_nr;
b2d444d7 2391 set_bit(In_sync, &rdev->flags);
a778b73f
N		 2392 } else if (rdev->raid_disk >= mddev->raid_disks) {
2393 rdev->raid_disk = -1;
2394 clear_bit(In_sync, &rdev->flags);
1da177e4
LT		 2395 }
2396 }
2397
2398
2399
2400 if (mddev->recovery_cp != MaxSector &&
2401 mddev->level >= 1)
2402 printk(KERN_ERR "md: %s: raid array is not clean"
2403 " -- starting background reconstruction\n",
2404 mdname(mddev));
2405
1da177e4
LT		 2406}
2407
16f17b39
N		 2408static ssize_t
2409safe_delay_show(mddev_t *mddev, char *page)
2410{
2411 int msec = (mddev->safemode_delay*1000)/HZ;
2412 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2413}
2414static ssize_t
2415safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2416{
2417 int scale=1;
2418 int dot=0;
2419 int i;
2420 unsigned long msec;
2421 char buf[30];
2422 char *e;
2423 /* remove a period, and count digits after it */
2424 if (len >= sizeof(buf))
2425 return -EINVAL;
2426 strlcpy(buf, cbuf, len);
2427 buf[len] = 0;
2428 for (i=0; i<len; i++) {
2429 if (dot) {
2430 if (isdigit(buf[i])) {
2431 buf[i-1] = buf[i];
2432 scale *= 10;
2433 }
2434 buf[i] = 0;
2435 } else if (buf[i] == '.') {
2436 dot=1;
2437 buf[i] = 0;
2438 }
2439 }
2440 msec = simple_strtoul(buf, &e, 10);
2441 if (e == buf || (*e && *e != '\n'))
2442 return -EINVAL;
2443 msec = (msec * 1000) / scale;
2444 if (msec == 0)
2445 mddev->safemode_delay = 0;
2446 else {
2447 mddev->safemode_delay = (msec*HZ)/1000;
2448 if (mddev->safemode_delay == 0)
2449 mddev->safemode_delay = 1;
2450 }
2451 return len;
2452}
2453static struct md_sysfs_entry md_safe_delay =
80ca3a44 2454__ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
16f17b39 2455
eae1701f 2456static ssize_t
96de1e66 2457level_show(mddev_t *mddev, char *page)
eae1701f 2458{
2604b703 2459 struct mdk_personality *p = mddev->pers;
d9d166c2 2460 if (p)
eae1701f 2461 return sprintf(page, "%s\n", p->name);
d9d166c2
N		 2462 else if (mddev->clevel[0])
2463 return sprintf(page, "%s\n", mddev->clevel);
2464 else if (mddev->level != LEVEL_NONE)
2465 return sprintf(page, "%d\n", mddev->level);
2466 else
2467 return 0;
eae1701f
N		 2468}
2469
d9d166c2
N		 2470static ssize_t
2471level_store(mddev_t *mddev, const char *buf, size_t len)
2472{
20a49ff6 2473 ssize_t rv = len;
d9d166c2
N		 2474 if (mddev->pers)
2475 return -EBUSY;
2476 if (len == 0)
2477 return 0;
2478 if (len >= sizeof(mddev->clevel))
2479 return -ENOSPC;
2480 strncpy(mddev->clevel, buf, len);
2481 if (mddev->clevel[len-1] == '\n')
2482 len--;
2483 mddev->clevel[len] = 0;
2484 mddev->level = LEVEL_NONE;
2485 return rv;
2486}
2487
2488static struct md_sysfs_entry md_level =
80ca3a44 2489__ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
eae1701f 2490
d4dbd025
N		 2491
2492static ssize_t
2493layout_show(mddev_t *mddev, char *page)
2494{
2495 /* just a number, not meaningful for all levels */
08a02ecd
N		 2496 if (mddev->reshape_position != MaxSector &&
2497 mddev->layout != mddev->new_layout)
2498 return sprintf(page, "%d (%d)\n",
2499 mddev->new_layout, mddev->layout);
d4dbd025
N		 2500 return sprintf(page, "%d\n", mddev->layout);
2501}
2502
2503static ssize_t
2504layout_store(mddev_t *mddev, const char *buf, size_t len)
2505{
2506 char *e;
2507 unsigned long n = simple_strtoul(buf, &e, 10);
d4dbd025
N		 2508
2509 if (!*buf || (*e && *e != '\n'))
2510 return -EINVAL;
2511
08a02ecd
N		 2512 if (mddev->pers)
2513 return -EBUSY;
2514 if (mddev->reshape_position != MaxSector)
2515 mddev->new_layout = n;
2516 else
2517 mddev->layout = n;
d4dbd025
N		 2518 return len;
2519}
2520static struct md_sysfs_entry md_layout =
80ca3a44 2521__ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
d4dbd025
N		 2522
2523
eae1701f 2524static ssize_t
96de1e66 2525raid_disks_show(mddev_t *mddev, char *page)
eae1701f 2526{
bb636547
N		 2527 if (mddev->raid_disks == 0)
2528 return 0;
08a02ecd
N		 2529 if (mddev->reshape_position != MaxSector &&
2530 mddev->delta_disks != 0)
2531 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2532 mddev->raid_disks - mddev->delta_disks);
eae1701f
N		 2533 return sprintf(page, "%d\n", mddev->raid_disks);
2534}
2535
da943b99
N		 2536static int update_raid_disks(mddev_t *mddev, int raid_disks);
2537
2538static ssize_t
2539raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2540{
da943b99
N		 2541 char *e;
2542 int rv = 0;
2543 unsigned long n = simple_strtoul(buf, &e, 10);
2544
2545 if (!*buf || (*e && *e != '\n'))
2546 return -EINVAL;
2547
2548 if (mddev->pers)
2549 rv = update_raid_disks(mddev, n);
08a02ecd
N		 2550 else if (mddev->reshape_position != MaxSector) {
2551 int olddisks = mddev->raid_disks - mddev->delta_disks;
2552 mddev->delta_disks = n - olddisks;
2553 mddev->raid_disks = n;
2554 } else
da943b99
N		 2555 mddev->raid_disks = n;
2556 return rv ? rv : len;
2557}
2558static struct md_sysfs_entry md_raid_disks =
80ca3a44 2559__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
eae1701f 2560
3b34380a
N		 2561static ssize_t
2562chunk_size_show(mddev_t *mddev, char *page)
2563{
08a02ecd
N		 2564 if (mddev->reshape_position != MaxSector &&
2565 mddev->chunk_size != mddev->new_chunk)
2566 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2567 mddev->chunk_size);
3b34380a
N		 2568 return sprintf(page, "%d\n", mddev->chunk_size);
2569}
2570
2571static ssize_t
2572chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2573{
2574 /* can only set chunk_size if array is not yet active */
2575 char *e;
2576 unsigned long n = simple_strtoul(buf, &e, 10);
2577
3b34380a
N		 2578 if (!*buf || (*e && *e != '\n'))
2579 return -EINVAL;
2580
08a02ecd
N		 2581 if (mddev->pers)
2582 return -EBUSY;
2583 else if (mddev->reshape_position != MaxSector)
2584 mddev->new_chunk = n;
2585 else
2586 mddev->chunk_size = n;
3b34380a
N		 2587 return len;
2588}
2589static struct md_sysfs_entry md_chunk_size =
80ca3a44 2590__ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3b34380a 2591
a94213b1
N		 2592static ssize_t
2593resync_start_show(mddev_t *mddev, char *page)
2594{
2595 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2596}
2597
2598static ssize_t
2599resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2600{
a94213b1
N		 2601 char *e;
2602 unsigned long long n = simple_strtoull(buf, &e, 10);
2603
2604 if (mddev->pers)
2605 return -EBUSY;
2606 if (!*buf || (*e && *e != '\n'))
2607 return -EINVAL;
2608
2609 mddev->recovery_cp = n;
2610 return len;
2611}
2612static struct md_sysfs_entry md_resync_start =
80ca3a44 2613__ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
a94213b1 2614
9e653b63
N		 2615/*
2616 * The array state can be:
2617 *
2618 * clear
2619 * No devices, no size, no level
2620 * Equivalent to STOP_ARRAY ioctl
2621 * inactive
2622 * May have some settings, but array is not active
2623 * all IO results in error
2624 * When written, doesn't tear down array, but just stops it
2625 * suspended (not supported yet)
2626 * All IO requests will block. The array can be reconfigured.
2627 * Writing this, if accepted, will block until array is quiessent
2628 * readonly
2629 * no resync can happen. no superblocks get written.
2630 * write requests fail
2631 * read-auto
2632 * like readonly, but behaves like 'clean' on a write request.
2633 *
2634 * clean - no pending writes, but otherwise active.
2635 * When written to inactive array, starts without resync
2636 * If a write request arrives then
2637 * if metadata is known, mark 'dirty' and switch to 'active'.
2638 * if not known, block and switch to write-pending
2639 * If written to an active array that has pending writes, then fails.
2640 * active
2641 * fully active: IO and resync can be happening.
2642 * When written to inactive array, starts with resync
2643 *
2644 * write-pending
2645 * clean, but writes are blocked waiting for 'active' to be written.
2646 *
2647 * active-idle
2648 * like active, but no writes have been seen for a while (100msec).
2649 *
2650 */
2651enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2652 write_pending, active_idle, bad_word};
05381954 2653static char *array_states[] = {
9e653b63
N		 2654 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2655 "write-pending", "active-idle", NULL };
2656
2657static int match_word(const char *word, char **list)
2658{
2659 int n;
2660 for (n=0; list[n]; n++)
2661 if (cmd_match(word, list[n]))
2662 break;
2663 return n;
2664}
2665
2666static ssize_t
2667array_state_show(mddev_t *mddev, char *page)
2668{
2669 enum array_state st = inactive;
2670
2671 if (mddev->pers)
2672 switch(mddev->ro) {
2673 case 1:
2674 st = readonly;
2675 break;
2676 case 2:
2677 st = read_auto;
2678 break;
2679 case 0:
2680 if (mddev->in_sync)
2681 st = clean;
e691063a
N		 2682 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
2683 st = write_pending;
9e653b63
N		 2684 else if (mddev->safemode)
2685 st = active_idle;
2686 else
2687 st = active;
2688 }
2689 else {
2690 if (list_empty(&mddev->disks) &&
2691 mddev->raid_disks == 0 &&
2692 mddev->size == 0)
2693 st = clear;
2694 else
2695 st = inactive;
2696 }
2697 return sprintf(page, "%s\n", array_states[st]);
2698}
2699
2700static int do_md_stop(mddev_t * mddev, int ro);
2701static int do_md_run(mddev_t * mddev);
2702static int restart_array(mddev_t *mddev);
2703
2704static ssize_t
2705array_state_store(mddev_t *mddev, const char *buf, size_t len)
2706{
2707 int err = -EINVAL;
2708 enum array_state st = match_word(buf, array_states);
2709 switch(st) {
2710 case bad_word:
2711 break;
2712 case clear:
2713 /* stopping an active array */
e691063a
N		 2714 if (atomic_read(&mddev->active) > 1)
2715 return -EBUSY;
2716 err = do_md_stop(mddev, 0);
9e653b63
N		 2717 break;
2718 case inactive:
2719 /* stopping an active array */
2720 if (mddev->pers) {
2721 if (atomic_read(&mddev->active) > 1)
2722 return -EBUSY;
2723 err = do_md_stop(mddev, 2);
e691063a
N		 2724 } else
2725 err = 0; /* already inactive */
9e653b63
N		 2726 break;
2727 case suspended:
2728 break; /* not supported yet */
2729 case readonly:
2730 if (mddev->pers)
2731 err = do_md_stop(mddev, 1);
2732 else {
2733 mddev->ro = 1;
648b629e 2734 set_disk_ro(mddev->gendisk, 1);
9e653b63
N		 2735 err = do_md_run(mddev);
2736 }
2737 break;
2738 case read_auto:
9e653b63 2739 if (mddev->pers) {
648b629e
N		 2740 if (mddev->ro != 1)
2741 err = do_md_stop(mddev, 1);
2742 else
2743 err = restart_array(mddev);
2744 if (err == 0) {
2745 mddev->ro = 2;
2746 set_disk_ro(mddev->gendisk, 0);
2747 }
9e653b63
N		 2748 } else {
2749 mddev->ro = 2;
2750 err = do_md_run(mddev);
2751 }
2752 break;
2753 case clean:
2754 if (mddev->pers) {
2755 restart_array(mddev);
2756 spin_lock_irq(&mddev->write_lock);
2757 if (atomic_read(&mddev->writes_pending) == 0) {
e691063a
N		 2758 if (mddev->in_sync == 0) {
2759 mddev->in_sync = 1;
31a59e34
N		 2760 if (mddev->safemode == 1)
2761 mddev->safemode = 0;
e691063a
N		 2762 if (mddev->persistent)
2763 set_bit(MD_CHANGE_CLEAN,
2764 &mddev->flags);
2765 }
2766 err = 0;
2767 } else
2768 err = -EBUSY;
9e653b63
N		 2769 spin_unlock_irq(&mddev->write_lock);
2770 } else {
2771 mddev->ro = 0;
2772 mddev->recovery_cp = MaxSector;
2773 err = do_md_run(mddev);
2774 }
2775 break;
2776 case active:
2777 if (mddev->pers) {
2778 restart_array(mddev);
e691063a
N		 2779 if (mddev->external)
2780 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
9e653b63
N		 2781 wake_up(&mddev->sb_wait);
2782 err = 0;
2783 } else {
2784 mddev->ro = 0;
648b629e 2785 set_disk_ro(mddev->gendisk, 0);
9e653b63
N		 2786 err = do_md_run(mddev);
2787 }
2788 break;
2789 case write_pending:
2790 case active_idle:
2791 /* these cannot be set */
2792 break;
2793 }
2794 if (err)
2795 return err;
0fd62b86
NB		 2796 else {
2797 sysfs_notify(&mddev->kobj, NULL, "array_state");
9e653b63 2798 return len;
0fd62b86 2799 }
9e653b63 2800}
80ca3a44
N		 2801static struct md_sysfs_entry md_array_state =
2802__ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
9e653b63 2803
6d7ff738
N		 2804static ssize_t
2805null_show(mddev_t *mddev, char *page)
2806{
2807 return -EINVAL;
2808}
2809
2810static ssize_t
2811new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2812{
2813 /* buf must be %d:%d\n? giving major and minor numbers */
2814 /* The new device is added to the array.
2815 * If the array has a persistent superblock, we read the
2816 * superblock to initialise info and check validity.
2817 * Otherwise, only checking done is that in bind_rdev_to_array,
2818 * which mainly checks size.
2819 */
2820 char *e;
2821 int major = simple_strtoul(buf, &e, 10);
2822 int minor;
2823 dev_t dev;
2824 mdk_rdev_t *rdev;
2825 int err;
2826
2827 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2828 return -EINVAL;
2829 minor = simple_strtoul(e+1, &e, 10);
2830 if (*e && *e != '\n')
2831 return -EINVAL;
2832 dev = MKDEV(major, minor);
2833 if (major != MAJOR(dev) ||
2834 minor != MINOR(dev))
2835 return -EOVERFLOW;
2836
2837
2838 if (mddev->persistent) {
2839 rdev = md_import_device(dev, mddev->major_version,
2840 mddev->minor_version);
2841 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2842 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2843 mdk_rdev_t, same_set);
2844 err = super_types[mddev->major_version]
2845 .load_super(rdev, rdev0, mddev->minor_version);
2846 if (err < 0)
2847 goto out;
2848 }
c5d79adb
N		 2849 } else if (mddev->external)
2850 rdev = md_import_device(dev, -2, -1);
2851 else
6d7ff738
N		 2852 rdev = md_import_device(dev, -1, -1);
2853
2854 if (IS_ERR(rdev))
2855 return PTR_ERR(rdev);
2856 err = bind_rdev_to_array(rdev, mddev);
2857 out:
2858 if (err)
2859 export_rdev(rdev);
2860 return err ? err : len;
2861}
2862
2863static struct md_sysfs_entry md_new_device =
80ca3a44 2864__ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3b34380a 2865
9b1d1dac
PC		 2866static ssize_t
2867bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2868{
2869 char *end;
2870 unsigned long chunk, end_chunk;
2871
2872 if (!mddev->bitmap)
2873 goto out;
2874 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2875 while (*buf) {
2876 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2877 if (buf == end) break;
2878 if (*end == '-') { /* range */
2879 buf = end + 1;
2880 end_chunk = simple_strtoul(buf, &end, 0);
2881 if (buf == end) break;
2882 }
2883 if (*end && !isspace(*end)) break;
2884 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2885 buf = end;
2886 while (isspace(*buf)) buf++;
2887 }
2888 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2889out:
2890 return len;
2891}
2892
2893static struct md_sysfs_entry md_bitmap =
2894__ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2895
a35b0d69
N		 2896static ssize_t
2897size_show(mddev_t *mddev, char *page)
2898{
2899 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2900}
2901
2902static int update_size(mddev_t *mddev, unsigned long size);
2903
2904static ssize_t
2905size_store(mddev_t *mddev, const char *buf, size_t len)
2906{
2907 /* If array is inactive, we can reduce the component size, but
2908 * not increase it (except from 0).
2909 * If array is active, we can try an on-line resize
2910 */
2911 char *e;
2912 int err = 0;
2913 unsigned long long size = simple_strtoull(buf, &e, 10);
2914 if (!*buf || *buf == '\n' ||
2915 (*e && *e != '\n'))
2916 return -EINVAL;
2917
2918 if (mddev->pers) {
2919 err = update_size(mddev, size);
850b2b42 2920 md_update_sb(mddev, 1);
a35b0d69
N		 2921 } else {
2922 if (mddev->size == 0 ||
2923 mddev->size > size)
2924 mddev->size = size;
2925 else
2926 err = -ENOSPC;
2927 }
2928 return err ? err : len;
2929}
2930
2931static struct md_sysfs_entry md_size =
80ca3a44 2932__ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
a35b0d69 2933
8bb93aac
N		 2934
2935/* Metdata version.
e691063a
N		 2936 * This is one of
2937 * 'none' for arrays with no metadata (good luck...)
2938 * 'external' for arrays with externally managed metadata,
8bb93aac
N		 2939 * or N.M for internally known formats
2940 */
2941static ssize_t
2942metadata_show(mddev_t *mddev, char *page)
2943{
2944 if (mddev->persistent)
2945 return sprintf(page, "%d.%d\n",
2946 mddev->major_version, mddev->minor_version);
e691063a
N		 2947 else if (mddev->external)
2948 return sprintf(page, "external:%s\n", mddev->metadata_type);
8bb93aac
N		 2949 else
2950 return sprintf(page, "none\n");
2951}
2952
2953static ssize_t
2954metadata_store(mddev_t *mddev, const char *buf, size_t len)
2955{
2956 int major, minor;
2957 char *e;
2958 if (!list_empty(&mddev->disks))
2959 return -EBUSY;
2960
2961 if (cmd_match(buf, "none")) {
2962 mddev->persistent = 0;
e691063a
N		 2963 mddev->external = 0;
2964 mddev->major_version = 0;
2965 mddev->minor_version = 90;
2966 return len;
2967 }
2968 if (strncmp(buf, "external:", 9) == 0) {
20a49ff6 2969 size_t namelen = len-9;
e691063a
N		 2970 if (namelen >= sizeof(mddev->metadata_type))
2971 namelen = sizeof(mddev->metadata_type)-1;
2972 strncpy(mddev->metadata_type, buf+9, namelen);
2973 mddev->metadata_type[namelen] = 0;
2974 if (namelen && mddev->metadata_type[namelen-1] == '\n')
2975 mddev->metadata_type[--namelen] = 0;
2976 mddev->persistent = 0;
2977 mddev->external = 1;
8bb93aac
N		 2978 mddev->major_version = 0;
2979 mddev->minor_version = 90;
2980 return len;
2981 }
2982 major = simple_strtoul(buf, &e, 10);
2983 if (e==buf || *e != '.')
2984 return -EINVAL;
2985 buf = e+1;
2986 minor = simple_strtoul(buf, &e, 10);
3f9d7b0d 2987 if (e==buf || (*e && *e != '\n') )
8bb93aac 2988 return -EINVAL;
50511da3 2989 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
8bb93aac
N		 2990 return -ENOENT;
2991 mddev->major_version = major;
2992 mddev->minor_version = minor;
2993 mddev->persistent = 1;
e691063a 2994 mddev->external = 0;
8bb93aac
N		 2995 return len;
2996}
2997
2998static struct md_sysfs_entry md_metadata =
80ca3a44 2999__ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
8bb93aac 3000
24dd469d 3001static ssize_t
7eec314d 3002action_show(mddev_t *mddev, char *page)
24dd469d 3003{
7eec314d 3004 char *type = "idle";
31399d9e 3005 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2b12ab6d 3006 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
ccfcc3c1
N		 3007 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3008 type = "reshape";
3009 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N		 3010 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3011 type = "resync";
3012 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3013 type = "check";
3014 else
3015 type = "repair";
72a23c21 3016 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
24dd469d
N		 3017 type = "recover";
3018 }
3019 return sprintf(page, "%s\n", type);
3020}
3021
3022static ssize_t
7eec314d 3023action_store(mddev_t *mddev, const char *page, size_t len)
24dd469d 3024{
7eec314d
N		 3025 if (!mddev->pers || !mddev->pers->sync_request)
3026 return -EINVAL;
3027
bce74dac 3028 if (cmd_match(page, "idle")) {
7eec314d
N		 3029 if (mddev->sync_thread) {
3030 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3031 md_unregister_thread(mddev->sync_thread);
3032 mddev->sync_thread = NULL;
3033 mddev->recovery = 0;
3034 }
03c902e1
N		 3035 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3036 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 3037 return -EBUSY;
72a23c21
NB		 3038 else if (cmd_match(page, "resync"))
3039 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3040 else if (cmd_match(page, "recover")) {
3041 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7eec314d 3042 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
72a23c21 3043 } else if (cmd_match(page, "reshape")) {
16484bf5
N		 3044 int err;
3045 if (mddev->pers->start_reshape == NULL)
3046 return -EINVAL;
3047 err = mddev->pers->start_reshape(mddev);
3048 if (err)
3049 return err;
a99ac971 3050 sysfs_notify(&mddev->kobj, NULL, "degraded");
16484bf5 3051 } else {
bce74dac 3052 if (cmd_match(page, "check"))
7eec314d 3053 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2adc7d47 3054 else if (!cmd_match(page, "repair"))
7eec314d
N		 3055 return -EINVAL;
3056 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3057 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7eec314d 3058 }
03c902e1 3059 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d 3060 md_wakeup_thread(mddev->thread);
72a23c21 3061 sysfs_notify(&mddev->kobj, NULL, "sync_action");
24dd469d
N		 3062 return len;
3063}
3064
9d88883e 3065static ssize_t
96de1e66 3066mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 3067{
3068 return sprintf(page, "%llu\n",
3069 (unsigned long long) mddev->resync_mismatches);
3070}
3071
80ca3a44
N		 3072static struct md_sysfs_entry md_scan_mode =
3073__ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 3074
96de1e66 3075
80ca3a44 3076static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 3077
88202a0c
N		 3078static ssize_t
3079sync_min_show(mddev_t *mddev, char *page)
3080{
3081 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3082 mddev->sync_speed_min ? "local": "system");
3083}
3084
3085static ssize_t
3086sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3087{
3088 int min;
3089 char *e;
3090 if (strncmp(buf, "system", 6)==0) {
3091 mddev->sync_speed_min = 0;
3092 return len;
3093 }
3094 min = simple_strtoul(buf, &e, 10);
3095 if (buf == e || (*e && *e != '\n') || min <= 0)
3096 return -EINVAL;
3097 mddev->sync_speed_min = min;
3098 return len;
3099}
3100
3101static struct md_sysfs_entry md_sync_min =
3102__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3103
3104static ssize_t
3105sync_max_show(mddev_t *mddev, char *page)
3106{
3107 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3108 mddev->sync_speed_max ? "local": "system");
3109}
3110
3111static ssize_t
3112sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3113{
3114 int max;
3115 char *e;
3116 if (strncmp(buf, "system", 6)==0) {
3117 mddev->sync_speed_max = 0;
3118 return len;
3119 }
3120 max = simple_strtoul(buf, &e, 10);
3121 if (buf == e || (*e && *e != '\n') || max <= 0)
3122 return -EINVAL;
3123 mddev->sync_speed_max = max;
3124 return len;
3125}
3126
3127static struct md_sysfs_entry md_sync_max =
3128__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3129
d7f3d291
IP		 3130static ssize_t
3131degraded_show(mddev_t *mddev, char *page)
3132{
3133 return sprintf(page, "%d\n", mddev->degraded);
3134}
3135static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
88202a0c 3136
90b08710
BS		 3137static ssize_t
3138sync_force_parallel_show(mddev_t *mddev, char *page)
3139{
3140 return sprintf(page, "%d\n", mddev->parallel_resync);
3141}
3142
3143static ssize_t
3144sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3145{
3146 long n;
3147
3148 if (strict_strtol(buf, 10, &n))
3149 return -EINVAL;
3150
3151 if (n != 0 && n != 1)
3152 return -EINVAL;
3153
3154 mddev->parallel_resync = n;
3155
3156 if (mddev->sync_thread)
3157 wake_up(&resync_wait);
3158
3159 return len;
3160}
3161
3162/* force parallel resync, even with shared block devices */
3163static struct md_sysfs_entry md_sync_force_parallel =
3164__ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3165 sync_force_parallel_show, sync_force_parallel_store);
3166
88202a0c
N		 3167static ssize_t
3168sync_speed_show(mddev_t *mddev, char *page)
3169{
3170 unsigned long resync, dt, db;
ff4e8d9a 3171 resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active));
88202a0c
N		 3172 dt = ((jiffies - mddev->resync_mark) / HZ);
3173 if (!dt) dt++;
3174 db = resync - (mddev->resync_mark_cnt);
3175 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
3176}
3177
80ca3a44 3178static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
88202a0c
N		 3179
3180static ssize_t
3181sync_completed_show(mddev_t *mddev, char *page)
3182{
3183 unsigned long max_blocks, resync;
3184
3185 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3186 max_blocks = mddev->resync_max_sectors;
3187 else
3188 max_blocks = mddev->size << 1;
3189
3190 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
3191 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
3192}
3193
80ca3a44 3194static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
88202a0c 3195
5e96ee65
NB		 3196static ssize_t
3197min_sync_show(mddev_t *mddev, char *page)
3198{
3199 return sprintf(page, "%llu\n",
3200 (unsigned long long)mddev->resync_min);
3201}
3202static ssize_t
3203min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3204{
3205 unsigned long long min;
3206 if (strict_strtoull(buf, 10, &min))
3207 return -EINVAL;
3208 if (min > mddev->resync_max)
3209 return -EINVAL;
3210 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3211 return -EBUSY;
3212
3213 /* Must be a multiple of chunk_size */
3214 if (mddev->chunk_size) {
3215 if (min & (sector_t)((mddev->chunk_size>>9)-1))
3216 return -EINVAL;
3217 }
3218 mddev->resync_min = min;
3219
3220 return len;
3221}
3222
3223static struct md_sysfs_entry md_min_sync =
3224__ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3225
c6207277
N		 3226static ssize_t
3227max_sync_show(mddev_t *mddev, char *page)
3228{
3229 if (mddev->resync_max == MaxSector)
3230 return sprintf(page, "max\n");
3231 else
3232 return sprintf(page, "%llu\n",
3233 (unsigned long long)mddev->resync_max);
3234}
3235static ssize_t
3236max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3237{
3238 if (strncmp(buf, "max", 3) == 0)
3239 mddev->resync_max = MaxSector;
3240 else {
5e96ee65
NB		 3241 unsigned long long max;
3242 if (strict_strtoull(buf, 10, &max))
3243 return -EINVAL;
3244 if (max < mddev->resync_min)
c6207277
N		 3245 return -EINVAL;
3246 if (max < mddev->resync_max &&
3247 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3248 return -EBUSY;
3249
3250 /* Must be a multiple of chunk_size */
3251 if (mddev->chunk_size) {
3252 if (max & (sector_t)((mddev->chunk_size>>9)-1))
3253 return -EINVAL;
3254 }
3255 mddev->resync_max = max;
3256 }
3257 wake_up(&mddev->recovery_wait);
3258 return len;
3259}
3260
3261static struct md_sysfs_entry md_max_sync =
3262__ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3263
e464eafd
N		 3264static ssize_t
3265suspend_lo_show(mddev_t *mddev, char *page)
3266{
3267 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3268}
3269
3270static ssize_t
3271suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3272{
3273 char *e;
3274 unsigned long long new = simple_strtoull(buf, &e, 10);
3275
3276 if (mddev->pers->quiesce == NULL)
3277 return -EINVAL;
3278 if (buf == e || (*e && *e != '\n'))
3279 return -EINVAL;
3280 if (new >= mddev->suspend_hi ||
3281 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3282 mddev->suspend_lo = new;
3283 mddev->pers->quiesce(mddev, 2);
3284 return len;
3285 } else
3286 return -EINVAL;
3287}
3288static struct md_sysfs_entry md_suspend_lo =
3289__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3290
3291
3292static ssize_t
3293suspend_hi_show(mddev_t *mddev, char *page)
3294{
3295 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3296}
3297
3298static ssize_t
3299suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3300{
3301 char *e;
3302 unsigned long long new = simple_strtoull(buf, &e, 10);
3303
3304 if (mddev->pers->quiesce == NULL)
3305 return -EINVAL;
3306 if (buf == e || (*e && *e != '\n'))
3307 return -EINVAL;
3308 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3309 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3310 mddev->suspend_hi = new;
3311 mddev->pers->quiesce(mddev, 1);
3312 mddev->pers->quiesce(mddev, 0);
3313 return len;
3314 } else
3315 return -EINVAL;
3316}
3317static struct md_sysfs_entry md_suspend_hi =
3318__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3319
08a02ecd
N		 3320static ssize_t
3321reshape_position_show(mddev_t *mddev, char *page)
3322{
3323 if (mddev->reshape_position != MaxSector)
3324 return sprintf(page, "%llu\n",
3325 (unsigned long long)mddev->reshape_position);
3326 strcpy(page, "none\n");
3327 return 5;
3328}
3329
3330static ssize_t
3331reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3332{
3333 char *e;
3334 unsigned long long new = simple_strtoull(buf, &e, 10);
3335 if (mddev->pers)
3336 return -EBUSY;
3337 if (buf == e || (*e && *e != '\n'))
3338 return -EINVAL;
3339 mddev->reshape_position = new;
3340 mddev->delta_disks = 0;
3341 mddev->new_level = mddev->level;
3342 mddev->new_layout = mddev->layout;
3343 mddev->new_chunk = mddev->chunk_size;
3344 return len;
3345}
3346
3347static struct md_sysfs_entry md_reshape_position =
3348__ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3349 reshape_position_store);
3350
e464eafd 3351
eae1701f
N		 3352static struct attribute *md_default_attrs[] = {
3353 &md_level.attr,
d4dbd025 3354 &md_layout.attr,
eae1701f 3355 &md_raid_disks.attr,
3b34380a 3356 &md_chunk_size.attr,
a35b0d69 3357 &md_size.attr,
a94213b1 3358 &md_resync_start.attr,
8bb93aac 3359 &md_metadata.attr,
6d7ff738 3360 &md_new_device.attr,
16f17b39 3361 &md_safe_delay.attr,
9e653b63 3362 &md_array_state.attr,
08a02ecd 3363 &md_reshape_position.attr,
411036fa
N		 3364 NULL,
3365};
3366
3367static struct attribute *md_redundancy_attrs[] = {
24dd469d 3368 &md_scan_mode.attr,
9d88883e 3369 &md_mismatches.attr,
88202a0c
N		 3370 &md_sync_min.attr,
3371 &md_sync_max.attr,
3372 &md_sync_speed.attr,
90b08710 3373 &md_sync_force_parallel.attr,
88202a0c 3374 &md_sync_completed.attr,
5e96ee65 3375 &md_min_sync.attr,
c6207277 3376 &md_max_sync.attr,
e464eafd
N		 3377 &md_suspend_lo.attr,
3378 &md_suspend_hi.attr,
9b1d1dac 3379 &md_bitmap.attr,
d7f3d291 3380 &md_degraded.attr,
eae1701f
N		 3381 NULL,
3382};
411036fa
N		 3383static struct attribute_group md_redundancy_group = {
3384 .name = NULL,
3385 .attrs = md_redundancy_attrs,
3386};
3387
eae1701f
N		 3388
3389static ssize_t
3390md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3391{
3392 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3393 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 3394 ssize_t rv;
eae1701f
N		 3395
3396 if (!entry->show)
3397 return -EIO;
5dc5cf7d
IM		 3398 rv = mddev_lock(mddev);
3399 if (!rv) {
3400 rv = entry->show(mddev, page);
3401 mddev_unlock(mddev);
3402 }
96de1e66 3403 return rv;
eae1701f
N		 3404}
3405
3406static ssize_t
3407md_attr_store(struct kobject *kobj, struct attribute *attr,
3408 const char *page, size_t length)
3409{
3410 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3411 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 3412 ssize_t rv;
eae1701f
N		 3413
3414 if (!entry->store)
3415 return -EIO;
67463acb
N		 3416 if (!capable(CAP_SYS_ADMIN))
3417 return -EACCES;
5dc5cf7d
IM		 3418 rv = mddev_lock(mddev);
3419 if (!rv) {
3420 rv = entry->store(mddev, page, length);
3421 mddev_unlock(mddev);
3422 }
96de1e66 3423 return rv;
eae1701f
N		 3424}
3425
3426static void md_free(struct kobject *ko)
3427{
3428 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3429 kfree(mddev);
3430}
3431
3432static struct sysfs_ops md_sysfs_ops = {
3433 .show = md_attr_show,
3434 .store = md_attr_store,
3435};
3436static struct kobj_type md_ktype = {
3437 .release = md_free,
3438 .sysfs_ops = &md_sysfs_ops,
3439 .default_attrs = md_default_attrs,
3440};
3441
1da177e4
LT		 3442int mdp_major = 0;
3443
3444static struct kobject *md_probe(dev_t dev, int *part, void *data)
3445{
48c9c27b 3446 static DEFINE_MUTEX(disks_mutex);
1da177e4
LT		 3447 mddev_t *mddev = mddev_find(dev);
3448 struct gendisk *disk;
3449 int partitioned = (MAJOR(dev) != MD_MAJOR);
3450 int shift = partitioned ? MdpMinorShift : 0;
3451 int unit = MINOR(dev) >> shift;
3830c62f 3452 int error;
1da177e4
LT		 3453
3454 if (!mddev)
3455 return NULL;
3456
48c9c27b 3457 mutex_lock(&disks_mutex);
1da177e4 3458 if (mddev->gendisk) {
48c9c27b 3459 mutex_unlock(&disks_mutex);
1da177e4
LT		 3460 mddev_put(mddev);
3461 return NULL;
3462 }
3463 disk = alloc_disk(1 << shift);
3464 if (!disk) {
48c9c27b 3465 mutex_unlock(&disks_mutex);
1da177e4
LT		 3466 mddev_put(mddev);
3467 return NULL;
3468 }
3469 disk->major = MAJOR(dev);
3470 disk->first_minor = unit << shift;
ce7b0f46 3471 if (partitioned)
1da177e4 3472 sprintf(disk->disk_name, "md_d%d", unit);
ce7b0f46 3473 else
1da177e4 3474 sprintf(disk->disk_name, "md%d", unit);
1da177e4
LT		 3475 disk->fops = &md_fops;
3476 disk->private_data = mddev;
3477 disk->queue = mddev->queue;
3478 add_disk(disk);
3479 mddev->gendisk = disk;
edfaa7c3 3480 error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj,
3830c62f 3481 "%s", "md");
f48ed538 3482 mutex_unlock(&disks_mutex);
3830c62f 3483 if (error)
5e55e2f5
N		 3484 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3485 disk->disk_name);
3830c62f
GKH		 3486 else
3487 kobject_uevent(&mddev->kobj, KOBJ_ADD);
1da177e4
LT		 3488 return NULL;
3489}
3490
1da177e4
LT		 3491static void md_safemode_timeout(unsigned long data)
3492{
3493 mddev_t *mddev = (mddev_t *) data;
3494
0fd62b86
NB		 3495 if (!atomic_read(&mddev->writes_pending)) {
3496 mddev->safemode = 1;
3497 if (mddev->external)
3498 sysfs_notify(&mddev->kobj, NULL, "array_state");
3499 }
1da177e4
LT		 3500 md_wakeup_thread(mddev->thread);
3501}
3502
6ff8d8ec 3503static int start_dirty_degraded;
1da177e4
LT		 3504
3505static int do_md_run(mddev_t * mddev)
3506{
2604b703 3507 int err;
1da177e4
LT		 3508 int chunk_size;
3509 struct list_head *tmp;
3510 mdk_rdev_t *rdev;
3511 struct gendisk *disk;
2604b703 3512 struct mdk_personality *pers;
1da177e4
LT		 3513 char b[BDEVNAME_SIZE];
3514
a757e64c
N		 3515 if (list_empty(&mddev->disks))
3516 /* cannot run an array with no devices.. */
1da177e4 3517 return -EINVAL;
1da177e4
LT		 3518
3519 if (mddev->pers)
3520 return -EBUSY;
3521
3522 /*
3523 * Analyze all RAID superblock(s)
3524 */
1ec4a939
N		 3525 if (!mddev->raid_disks) {
3526 if (!mddev->persistent)
3527 return -EINVAL;
a757e64c 3528 analyze_sbs(mddev);
1ec4a939 3529 }
1da177e4
LT		 3530
3531 chunk_size = mddev->chunk_size;
2604b703
N		 3532
3533 if (chunk_size) {
1da177e4
LT		 3534 if (chunk_size > MAX_CHUNK_SIZE) {
3535 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3536 chunk_size, MAX_CHUNK_SIZE);
3537 return -EINVAL;
3538 }
3539 /*
3540 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3541 */
3542 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 3543 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 3544 return -EINVAL;
3545 }
3546 if (chunk_size < PAGE_SIZE) {
3547 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
3548 chunk_size, PAGE_SIZE);
3549 return -EINVAL;
3550 }
3551
3552 /* devices must have minimum size of one chunk */
d089c6af 3553 rdev_for_each(rdev, tmp, mddev) {
b2d444d7 3554 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3555 continue;
3556 if (rdev->size < chunk_size / 1024) {
3557 printk(KERN_WARNING
3558 "md: Dev %s smaller than chunk_size:"
3559 " %lluk < %dk\n",
3560 bdevname(rdev->bdev,b),
3561 (unsigned long long)rdev->size,
3562 chunk_size / 1024);
3563 return -EINVAL;
3564 }
3565 }
3566 }
3567
1da177e4 3568#ifdef CONFIG_KMOD
d9d166c2
N		 3569 if (mddev->level != LEVEL_NONE)
3570 request_module("md-level-%d", mddev->level);
3571 else if (mddev->clevel[0])
3572 request_module("md-%s", mddev->clevel);
1da177e4
LT		 3573#endif
3574
3575 /*
3576 * Drop all container device buffers, from now on
3577 * the only valid external interface is through the md
3578 * device.
1da177e4 3579 */
d089c6af 3580 rdev_for_each(rdev, tmp, mddev) {
b2d444d7 3581 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3582 continue;
3583 sync_blockdev(rdev->bdev);
f98393a6 3584 invalidate_bdev(rdev->bdev);
f0d76d70
N		 3585
3586 /* perform some consistency tests on the device.
3587 * We don't want the data to overlap the metadata,
3588 * Internal Bitmap issues has handled elsewhere.
3589 */
3590 if (rdev->data_offset < rdev->sb_offset) {
3591 if (mddev->size &&
3592 rdev->data_offset + mddev->size*2
3593 > rdev->sb_offset*2) {
3594 printk("md: %s: data overlaps metadata\n",
3595 mdname(mddev));
3596 return -EINVAL;
3597 }
3598 } else {
3599 if (rdev->sb_offset*2 + rdev->sb_size/512
3600 > rdev->data_offset) {
3601 printk("md: %s: metadata overlaps data\n",
3602 mdname(mddev));
3603 return -EINVAL;
3604 }
3605 }
52664732 3606 sysfs_notify(&rdev->kobj, NULL, "state");
1da177e4
LT		 3607 }
3608
3609 md_probe(mddev->unit, NULL, NULL);
3610 disk = mddev->gendisk;
3611 if (!disk)
3612 return -ENOMEM;
3613
3614 spin_lock(&pers_lock);
d9d166c2 3615 pers = find_pers(mddev->level, mddev->clevel);
2604b703 3616 if (!pers || !try_module_get(pers->owner)) {
1da177e4 3617 spin_unlock(&pers_lock);
d9d166c2
N		 3618 if (mddev->level != LEVEL_NONE)
3619 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3620 mddev->level);
3621 else
3622 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3623 mddev->clevel);
1da177e4
LT		 3624 return -EINVAL;
3625 }
2604b703 3626 mddev->pers = pers;
1da177e4 3627 spin_unlock(&pers_lock);
d9d166c2
N		 3628 mddev->level = pers->level;
3629 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
1da177e4 3630
f6705578 3631 if (mddev->reshape_position != MaxSector &&
63c70c4f 3632 pers->start_reshape == NULL) {
f6705578
N		 3633 /* This personality cannot handle reshaping... */
3634 mddev->pers = NULL;
3635 module_put(pers->owner);
3636 return -EINVAL;
3637 }
3638
7dd5e7c3
N		 3639 if (pers->sync_request) {
3640 /* Warn if this is a potentially silly
3641 * configuration.
3642 */
3643 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3644 mdk_rdev_t *rdev2;
3645 struct list_head *tmp2;
3646 int warned = 0;
d089c6af
N		 3647 rdev_for_each(rdev, tmp, mddev) {
3648 rdev_for_each(rdev2, tmp2, mddev) {
7dd5e7c3
N		 3649 if (rdev < rdev2 &&
3650 rdev->bdev->bd_contains ==
3651 rdev2->bdev->bd_contains) {
3652 printk(KERN_WARNING
3653 "%s: WARNING: %s appears to be"
3654 " on the same physical disk as"
3655 " %s.\n",
3656 mdname(mddev),
3657 bdevname(rdev->bdev,b),
3658 bdevname(rdev2->bdev,b2));
3659 warned = 1;
3660 }
3661 }
3662 }
3663 if (warned)
3664 printk(KERN_WARNING
3665 "True protection against single-disk"
3666 " failure might be compromised.\n");
3667 }
3668
657390d2 3669 mddev->recovery = 0;
1da177e4 3670 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 3671 mddev->barriers_work = 1;
6ff8d8ec 3672 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 3673
f91de92e
N		 3674 if (start_readonly)
3675 mddev->ro = 2; /* read-only, but switch on first write */
3676
b15c2e57
N		 3677 err = mddev->pers->run(mddev);
3678 if (!err && mddev->pers->sync_request) {
3679 err = bitmap_create(mddev);
3680 if (err) {
3681 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3682 mdname(mddev), err);
3683 mddev->pers->stop(mddev);
3684 }
3685 }
1da177e4
LT		 3686 if (err) {
3687 printk(KERN_ERR "md: pers->run() failed ...\n");
3688 module_put(mddev->pers->owner);
3689 mddev->pers = NULL;
32a7627c
N		 3690 bitmap_destroy(mddev);
3691 return err;
1da177e4 3692 }
5e55e2f5
N		 3693 if (mddev->pers->sync_request) {
3694 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3695 printk(KERN_WARNING
3696 "md: cannot register extra attributes for %s\n",
3697 mdname(mddev));
3698 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
fd9d49ca
N		 3699 mddev->ro = 0;
3700
1da177e4
LT		 3701 atomic_set(&mddev->writes_pending,0);
3702 mddev->safemode = 0;
3703 mddev->safemode_timer.function = md_safemode_timeout;
3704 mddev->safemode_timer.data = (unsigned long) mddev;
16f17b39 3705 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
1da177e4 3706 mddev->in_sync = 1;
86e6ffdd 3707
d089c6af 3708 rdev_for_each(rdev, tmp, mddev)
86e6ffdd
N		 3709 if (rdev->raid_disk >= 0) {
3710 char nm[20];
3711 sprintf(nm, "rd%d", rdev->raid_disk);
5e55e2f5
N		 3712 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3713 printk("md: cannot register %s for %s\n",
3714 nm, mdname(mddev));
86e6ffdd 3715 }
1da177e4
LT		 3716
3717 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3718
850b2b42
N		 3719 if (mddev->flags)
3720 md_update_sb(mddev, 0);
1da177e4
LT		 3721
3722 set_capacity(disk, mddev->array_size<<1);
3723
3724 /* If we call blk_queue_make_request here, it will
3725 * re-initialise max_sectors etc which may have been
3726 * refined inside -> run. So just set the bits we need to set.
3727 * Most initialisation happended when we called
3728 * blk_queue_make_request(..., md_fail_request)
3729 * earlier.
3730 */
3731 mddev->queue->queuedata = mddev;
3732 mddev->queue->make_request_fn = mddev->pers->make_request;
3733
5fd6c1dc
N		 3734 /* If there is a partially-recovered drive we need to
3735 * start recovery here. If we leave it to md_check_recovery,
3736 * it will remove the drives and not do the right thing
3737 */
0b8c9de0 3738 if (mddev->degraded && !mddev->sync_thread) {
5fd6c1dc
N		 3739 struct list_head *rtmp;
3740 int spares = 0;
d089c6af 3741 rdev_for_each(rdev, rtmp, mddev)
5fd6c1dc
N		 3742 if (rdev->raid_disk >= 0 &&
3743 !test_bit(In_sync, &rdev->flags) &&
3744 !test_bit(Faulty, &rdev->flags))
3745 /* complete an interrupted recovery */
3746 spares++;
3747 if (spares && mddev->pers->sync_request) {
3748 mddev->recovery = 0;
3749 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3750 mddev->sync_thread = md_register_thread(md_do_sync,
3751 mddev,
3752 "%s_resync");
3753 if (!mddev->sync_thread) {
3754 printk(KERN_ERR "%s: could not start resync"
3755 " thread...\n",
3756 mdname(mddev));
3757 /* leave the spares where they are, it shouldn't hurt */
3758 mddev->recovery = 0;
0b8c9de0 3759 }
5fd6c1dc
N		 3760 }
3761 }
0b8c9de0
N		 3762 md_wakeup_thread(mddev->thread);
3763 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5fd6c1dc 3764
44ce6294 3765 mddev->changed = 1;
d7603b7e 3766 md_new_event(mddev);
0fd62b86 3767 sysfs_notify(&mddev->kobj, NULL, "array_state");
72a23c21 3768 sysfs_notify(&mddev->kobj, NULL, "sync_action");
a99ac971 3769 sysfs_notify(&mddev->kobj, NULL, "degraded");
edfaa7c3 3770 kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE);
1da177e4
LT		 3771 return 0;
3772}
3773
3774static int restart_array(mddev_t *mddev)
3775{
3776 struct gendisk *disk = mddev->gendisk;
3777 int err;
3778
3779 /*
3780 * Complain if it has no devices
3781 */
3782 err = -ENXIO;
3783 if (list_empty(&mddev->disks))
3784 goto out;
3785
3786 if (mddev->pers) {
3787 err = -EBUSY;
3788 if (!mddev->ro)
3789 goto out;
3790
3791 mddev->safemode = 0;
3792 mddev->ro = 0;
3793 set_disk_ro(disk, 0);
3794
3795 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3796 mdname(mddev));
3797 /*
3798 * Kick recovery or resync if necessary
3799 */
3800 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3801 md_wakeup_thread(mddev->thread);
5fd6c1dc 3802 md_wakeup_thread(mddev->sync_thread);
1da177e4 3803 err = 0;
0fd62b86
NB		 3804 sysfs_notify(&mddev->kobj, NULL, "array_state");
3805
9e653b63 3806 } else
1da177e4 3807 err = -EINVAL;
1da177e4
LT		 3808
3809out:
3810 return err;
3811}
3812
acc55e22
N		 3813/* similar to deny_write_access, but accounts for our holding a reference
3814 * to the file ourselves */
3815static int deny_bitmap_write_access(struct file * file)
3816{
3817 struct inode *inode = file->f_mapping->host;
3818
3819 spin_lock(&inode->i_lock);
3820 if (atomic_read(&inode->i_writecount) > 1) {
3821 spin_unlock(&inode->i_lock);
3822 return -ETXTBSY;
3823 }
3824 atomic_set(&inode->i_writecount, -1);
3825 spin_unlock(&inode->i_lock);
3826
3827 return 0;
3828}
3829
3830static void restore_bitmap_write_access(struct file *file)
3831{
3832 struct inode *inode = file->f_mapping->host;
3833
3834 spin_lock(&inode->i_lock);
3835 atomic_set(&inode->i_writecount, 1);
3836 spin_unlock(&inode->i_lock);
3837}
3838
9e653b63
N		 3839/* mode:
3840 * 0 - completely stop and dis-assemble array
3841 * 1 - switch to readonly
3842 * 2 - stop but do not disassemble array
3843 */
3844static int do_md_stop(mddev_t * mddev, int mode)
1da177e4
LT		 3845{
3846 int err = 0;
3847 struct gendisk *disk = mddev->gendisk;
3848
3849 if (mddev->pers) {
3850 if (atomic_read(&mddev->active)>2) {
3851 printk("md: %s still in use.\n",mdname(mddev));
3852 return -EBUSY;
3853 }
3854
3855 if (mddev->sync_thread) {
5fd6c1dc 3856 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4
LT		 3857 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3858 md_unregister_thread(mddev->sync_thread);
3859 mddev->sync_thread = NULL;
3860 }
3861
3862 del_timer_sync(&mddev->safemode_timer);
3863
3864 invalidate_partition(disk, 0);
3865
9e653b63
N		 3866 switch(mode) {
3867 case 1: /* readonly */
1da177e4 3868 err = -ENXIO;
f91de92e 3869 if (mddev->ro==1)
1da177e4
LT		 3870 goto out;
3871 mddev->ro = 1;
9e653b63
N		 3872 break;
3873 case 0: /* disassemble */
3874 case 2: /* stop */
6b8b3e8a 3875 bitmap_flush(mddev);
a9701a30 3876 md_super_wait(mddev);
1da177e4
LT		 3877 if (mddev->ro)
3878 set_disk_ro(disk, 0);
3879 blk_queue_make_request(mddev->queue, md_fail_request);
3880 mddev->pers->stop(mddev);
d1b5380c
N		 3881 mddev->queue->merge_bvec_fn = NULL;
3882 mddev->queue->unplug_fn = NULL;
041ae52e 3883 mddev->queue->backing_dev_info.congested_fn = NULL;
411036fa
N		 3884 if (mddev->pers->sync_request)
3885 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3886
1da177e4
LT		 3887 module_put(mddev->pers->owner);
3888 mddev->pers = NULL;
4f54b0e9
DW		 3889 /* tell userspace to handle 'inactive' */
3890 sysfs_notify(&mddev->kobj, NULL, "array_state");
0d4ca600
N		 3891
3892 set_capacity(disk, 0);
44ce6294 3893 mddev->changed = 1;
0d4ca600 3894
1da177e4
LT		 3895 if (mddev->ro)
3896 mddev->ro = 0;
3897 }
850b2b42 3898 if (!mddev->in_sync || mddev->flags) {
1da177e4
LT		 3899 /* mark array as shutdown cleanly */
3900 mddev->in_sync = 1;
850b2b42 3901 md_update_sb(mddev, 1);
1da177e4 3902 }
9e653b63 3903 if (mode == 1)
1da177e4 3904 set_disk_ro(disk, 1);
5fd6c1dc 3905 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4 3906 }
32a7627c 3907
1da177e4
LT		 3908 /*
3909 * Free resources if final stop
3910 */
9e653b63 3911 if (mode == 0) {
86e6ffdd
N		 3912 mdk_rdev_t *rdev;
3913 struct list_head *tmp;
0d4ca600 3914
1da177e4
LT		 3915 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3916
978f946b
N		 3917 bitmap_destroy(mddev);
3918 if (mddev->bitmap_file) {
acc55e22 3919 restore_bitmap_write_access(mddev->bitmap_file);
978f946b
N		 3920 fput(mddev->bitmap_file);
3921 mddev->bitmap_file = NULL;
3922 }
3923 mddev->bitmap_offset = 0;
3924
d089c6af 3925 rdev_for_each(rdev, tmp, mddev)
86e6ffdd
N		 3926 if (rdev->raid_disk >= 0) {
3927 char nm[20];
3928 sprintf(nm, "rd%d", rdev->raid_disk);
3929 sysfs_remove_link(&mddev->kobj, nm);
3930 }
3931
177a99b2 3932 /* make sure all md_delayed_delete calls have finished */
5792a285
N		 3933 flush_scheduled_work();
3934
1da177e4
LT		 3935 export_array(mddev);
3936
3937 mddev->array_size = 0;
9e653b63
N		 3938 mddev->size = 0;
3939 mddev->raid_disks = 0;
a94213b1 3940 mddev->recovery_cp = 0;
5e96ee65 3941 mddev->resync_min = 0;
c6207277 3942 mddev->resync_max = MaxSector;
08a02ecd 3943 mddev->reshape_position = MaxSector;
e691063a 3944 mddev->external = 0;
1ec4a939 3945 mddev->persistent = 0;
d897dbf9
N		 3946 mddev->level = LEVEL_NONE;
3947 mddev->clevel[0] = 0;
3948 mddev->flags = 0;
3949 mddev->ro = 0;
3950 mddev->metadata_type[0] = 0;
3951 mddev->chunk_size = 0;
3952 mddev->ctime = mddev->utime = 0;
3953 mddev->layout = 0;
3954 mddev->max_disks = 0;
3955 mddev->events = 0;
3956 mddev->delta_disks = 0;
3957 mddev->new_level = LEVEL_NONE;
3958 mddev->new_layout = 0;
3959 mddev->new_chunk = 0;
3960 mddev->curr_resync = 0;
3961 mddev->resync_mismatches = 0;
3962 mddev->suspend_lo = mddev->suspend_hi = 0;
3963 mddev->sync_speed_min = mddev->sync_speed_max = 0;
3964 mddev->recovery = 0;
3965 mddev->in_sync = 0;
3966 mddev->changed = 0;
3967 mddev->degraded = 0;
3968 mddev->barriers_work = 0;
3969 mddev->safemode = 0;
9e653b63 3970
a8a55c38 3971 } else if (mddev->pers)
1da177e4
LT		 3972 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3973 mdname(mddev));
3974 err = 0;
d7603b7e 3975 md_new_event(mddev);
0fd62b86 3976 sysfs_notify(&mddev->kobj, NULL, "array_state");
1da177e4
LT		 3977out:
3978 return err;
3979}
3980
fdee8ae4 3981#ifndef MODULE
1da177e4
LT		 3982static void autorun_array(mddev_t *mddev)
3983{
3984 mdk_rdev_t *rdev;
3985 struct list_head *tmp;
3986 int err;
3987
a757e64c 3988 if (list_empty(&mddev->disks))
1da177e4 3989 return;
1da177e4
LT		 3990
3991 printk(KERN_INFO "md: running: ");
3992
d089c6af 3993 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 3994 char b[BDEVNAME_SIZE];
3995 printk("<%s>", bdevname(rdev->bdev,b));
3996 }
3997 printk("\n");
3998
3999 err = do_md_run (mddev);
4000 if (err) {
4001 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4002 do_md_stop (mddev, 0);
4003 }
4004}
4005
4006/*
4007 * lets try to run arrays based on all disks that have arrived
4008 * until now. (those are in pending_raid_disks)
4009 *
4010 * the method: pick the first pending disk, collect all disks with
4011 * the same UUID, remove all from the pending list and put them into
4012 * the 'same_array' list. Then order this list based on superblock
4013 * update time (freshest comes first), kick out 'old' disks and
4014 * compare superblocks. If everything's fine then run it.
4015 *
4016 * If "unit" is allocated, then bump its reference count
4017 */
4018static void autorun_devices(int part)
4019{
1da177e4
LT		 4020 struct list_head *tmp;
4021 mdk_rdev_t *rdev0, *rdev;
4022 mddev_t *mddev;
4023 char b[BDEVNAME_SIZE];
4024
4025 printk(KERN_INFO "md: autorun ...\n");
4026 while (!list_empty(&pending_raid_disks)) {
e8703fe1 4027 int unit;
1da177e4 4028 dev_t dev;
ad01c9e3 4029 LIST_HEAD(candidates);
1da177e4
LT		 4030 rdev0 = list_entry(pending_raid_disks.next,
4031 mdk_rdev_t, same_set);
4032
4033 printk(KERN_INFO "md: considering %s ...\n",
4034 bdevname(rdev0->bdev,b));
4035 INIT_LIST_HEAD(&candidates);
73c34431 4036 rdev_for_each_list(rdev, tmp, pending_raid_disks)
1da177e4
LT		 4037 if (super_90_load(rdev, rdev0, 0) >= 0) {
4038 printk(KERN_INFO "md: adding %s ...\n",
4039 bdevname(rdev->bdev,b));
4040 list_move(&rdev->same_set, &candidates);
4041 }
4042 /*
4043 * now we have a set of devices, with all of them having
4044 * mostly sane superblocks. It's time to allocate the
4045 * mddev.
4046 */
e8703fe1
N		 4047 if (part) {
4048 dev = MKDEV(mdp_major,
4049 rdev0->preferred_minor << MdpMinorShift);
4050 unit = MINOR(dev) >> MdpMinorShift;
4051 } else {
4052 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4053 unit = MINOR(dev);
4054 }
4055 if (rdev0->preferred_minor != unit) {
1da177e4
LT		 4056 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4057 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4058 break;
4059 }
1da177e4
LT		 4060
4061 md_probe(dev, NULL, NULL);
4062 mddev = mddev_find(dev);
9bbbca3a
NB		 4063 if (!mddev || !mddev->gendisk) {
4064 if (mddev)
4065 mddev_put(mddev);
4066 printk(KERN_ERR
1da177e4
LT		 4067 "md: cannot allocate memory for md drive.\n");
4068 break;
4069 }
4070 if (mddev_lock(mddev))
4071 printk(KERN_WARNING "md: %s locked, cannot run\n",
4072 mdname(mddev));
4073 else if (mddev->raid_disks || mddev->major_version
4074 || !list_empty(&mddev->disks)) {
4075 printk(KERN_WARNING
4076 "md: %s already running, cannot run %s\n",
4077 mdname(mddev), bdevname(rdev0->bdev,b));
4078 mddev_unlock(mddev);
4079 } else {
4080 printk(KERN_INFO "md: created %s\n", mdname(mddev));
1ec4a939 4081 mddev->persistent = 1;
73c34431 4082 rdev_for_each_list(rdev, tmp, candidates) {
1da177e4
LT		 4083 list_del_init(&rdev->same_set);
4084 if (bind_rdev_to_array(rdev, mddev))
4085 export_rdev(rdev);
4086 }
4087 autorun_array(mddev);
4088 mddev_unlock(mddev);
4089 }
4090 /* on success, candidates will be empty, on error
4091 * it won't...
4092 */
73c34431 4093 rdev_for_each_list(rdev, tmp, candidates)
1da177e4
LT		 4094 export_rdev(rdev);
4095 mddev_put(mddev);
4096 }
4097 printk(KERN_INFO "md: ... autorun DONE.\n");
4098}
fdee8ae4 4099#endif /* !MODULE */
1da177e4 4100
1da177e4
LT		 4101static int get_version(void __user * arg)
4102{
4103 mdu_version_t ver;
4104
4105 ver.major = MD_MAJOR_VERSION;
4106 ver.minor = MD_MINOR_VERSION;
4107 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4108
4109 if (copy_to_user(arg, &ver, sizeof(ver)))
4110 return -EFAULT;
4111
4112 return 0;
4113}
4114
4115static int get_array_info(mddev_t * mddev, void __user * arg)
4116{
4117 mdu_array_info_t info;
4118 int nr,working,active,failed,spare;
4119 mdk_rdev_t *rdev;
4120 struct list_head *tmp;
4121
4122 nr=working=active=failed=spare=0;
d089c6af 4123 rdev_for_each(rdev, tmp, mddev) {
1da177e4 4124 nr++;
b2d444d7 4125 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 4126 failed++;
4127 else {
4128 working++;
b2d444d7 4129 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 4130 active++;
4131 else
4132 spare++;
4133 }
4134 }
4135
4136 info.major_version = mddev->major_version;
4137 info.minor_version = mddev->minor_version;
4138 info.patch_version = MD_PATCHLEVEL_VERSION;
4139 info.ctime = mddev->ctime;
4140 info.level = mddev->level;
4141 info.size = mddev->size;
284ae7ca
N		 4142 if (info.size != mddev->size) /* overflow */
4143 info.size = -1;
1da177e4
LT		 4144 info.nr_disks = nr;
4145 info.raid_disks = mddev->raid_disks;
4146 info.md_minor = mddev->md_minor;
4147 info.not_persistent= !mddev->persistent;
4148
4149 info.utime = mddev->utime;
4150 info.state = 0;
4151 if (mddev->in_sync)
4152 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 4153 if (mddev->bitmap && mddev->bitmap_offset)
4154 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 4155 info.active_disks = active;
4156 info.working_disks = working;
4157 info.failed_disks = failed;
4158 info.spare_disks = spare;
4159
4160 info.layout = mddev->layout;
4161 info.chunk_size = mddev->chunk_size;
4162
4163 if (copy_to_user(arg, &info, sizeof(info)))
4164 return -EFAULT;
4165
4166 return 0;
4167}
4168
87162a28 4169static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 4170{
4171 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4172 char *ptr, *buf = NULL;
4173 int err = -ENOMEM;
4174
2a2275d6
N		 4175 md_allow_write(mddev);
4176
32a7627c
N		 4177 file = kmalloc(sizeof(*file), GFP_KERNEL);
4178 if (!file)
4179 goto out;
4180
4181 /* bitmap disabled, zero the first byte and copy out */
4182 if (!mddev->bitmap || !mddev->bitmap->file) {
4183 file->pathname[0] = '\0';
4184 goto copy_out;
4185 }
4186
4187 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4188 if (!buf)
4189 goto out;
4190
6bcfd601
CH		 4191 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4192 if (IS_ERR(ptr))
32a7627c
N		 4193 goto out;
4194
4195 strcpy(file->pathname, ptr);
4196
4197copy_out:
4198 err = 0;
4199 if (copy_to_user(arg, file, sizeof(*file)))
4200 err = -EFAULT;
4201out:
4202 kfree(buf);
4203 kfree(file);
4204 return err;
4205}
4206
1da177e4
LT		 4207static int get_disk_info(mddev_t * mddev, void __user * arg)
4208{
4209 mdu_disk_info_t info;
4210 unsigned int nr;
4211 mdk_rdev_t *rdev;
4212
4213 if (copy_from_user(&info, arg, sizeof(info)))
4214 return -EFAULT;
4215
4216 nr = info.number;
4217
4218 rdev = find_rdev_nr(mddev, nr);
4219 if (rdev) {
4220 info.major = MAJOR(rdev->bdev->bd_dev);
4221 info.minor = MINOR(rdev->bdev->bd_dev);
4222 info.raid_disk = rdev->raid_disk;
4223 info.state = 0;
b2d444d7 4224 if (test_bit(Faulty, &rdev->flags))
1da177e4 4225 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 4226 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 4227 info.state |= (1<<MD_DISK_ACTIVE);
4228 info.state |= (1<<MD_DISK_SYNC);
4229 }
8ddf9efe
N		 4230 if (test_bit(WriteMostly, &rdev->flags))
4231 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 4232 } else {
4233 info.major = info.minor = 0;
4234 info.raid_disk = -1;
4235 info.state = (1<<MD_DISK_REMOVED);
4236 }
4237
4238 if (copy_to_user(arg, &info, sizeof(info)))
4239 return -EFAULT;
4240
4241 return 0;
4242}
4243
4244static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4245{
4246 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4247 mdk_rdev_t *rdev;
4248 dev_t dev = MKDEV(info->major,info->minor);
4249
4250 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4251 return -EOVERFLOW;
4252
4253 if (!mddev->raid_disks) {
4254 int err;
4255 /* expecting a device which has a superblock */
4256 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4257 if (IS_ERR(rdev)) {
4258 printk(KERN_WARNING
4259 "md: md_import_device returned %ld\n",
4260 PTR_ERR(rdev));
4261 return PTR_ERR(rdev);
4262 }
4263 if (!list_empty(&mddev->disks)) {
4264 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4265 mdk_rdev_t, same_set);
4266 int err = super_types[mddev->major_version]
4267 .load_super(rdev, rdev0, mddev->minor_version);
4268 if (err < 0) {
4269 printk(KERN_WARNING
4270 "md: %s has different UUID to %s\n",
4271 bdevname(rdev->bdev,b),
4272 bdevname(rdev0->bdev,b2));
4273 export_rdev(rdev);
4274 return -EINVAL;
4275 }
4276 }
4277 err = bind_rdev_to_array(rdev, mddev);
4278 if (err)
4279 export_rdev(rdev);
4280 return err;
4281 }
4282
4283 /*
4284 * add_new_disk can be used once the array is assembled
4285 * to add "hot spares". They must already have a superblock
4286 * written
4287 */
4288 if (mddev->pers) {
4289 int err;
4290 if (!mddev->pers->hot_add_disk) {
4291 printk(KERN_WARNING
4292 "%s: personality does not support diskops!\n",
4293 mdname(mddev));
4294 return -EINVAL;
4295 }
7b1e35f6
N		 4296 if (mddev->persistent)
4297 rdev = md_import_device(dev, mddev->major_version,
4298 mddev->minor_version);
4299 else
4300 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 4301 if (IS_ERR(rdev)) {
4302 printk(KERN_WARNING
4303 "md: md_import_device returned %ld\n",
4304 PTR_ERR(rdev));
4305 return PTR_ERR(rdev);
4306 }
41158c7e
N		 4307 /* set save_raid_disk if appropriate */
4308 if (!mddev->persistent) {
4309 if (info->state & (1<<MD_DISK_SYNC) &&
4310 info->raid_disk < mddev->raid_disks)
4311 rdev->raid_disk = info->raid_disk;
4312 else
4313 rdev->raid_disk = -1;
4314 } else
4315 super_types[mddev->major_version].
4316 validate_super(mddev, rdev);
4317 rdev->saved_raid_disk = rdev->raid_disk;
4318
b2d444d7 4319 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 4320 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4321 set_bit(WriteMostly, &rdev->flags);
4322
1da177e4
LT		 4323 rdev->raid_disk = -1;
4324 err = bind_rdev_to_array(rdev, mddev);
7c7546cc
N		 4325 if (!err && !mddev->pers->hot_remove_disk) {
4326 /* If there is hot_add_disk but no hot_remove_disk
4327 * then added disks for geometry changes,
4328 * and should be added immediately.
4329 */
4330 super_types[mddev->major_version].
4331 validate_super(mddev, rdev);
4332 err = mddev->pers->hot_add_disk(mddev, rdev);
4333 if (err)
4334 unbind_rdev_from_array(rdev);
4335 }
1da177e4
LT		 4336 if (err)
4337 export_rdev(rdev);
52664732
NB		 4338 else
4339 sysfs_notify(&rdev->kobj, NULL, "state");
c361777f 4340
17571284 4341 md_update_sb(mddev, 1);
72a23c21
NB		 4342 if (mddev->degraded)
4343 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
c361777f 4344 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 4345 md_wakeup_thread(mddev->thread);
1da177e4
LT		 4346 return err;
4347 }
4348
4349 /* otherwise, add_new_disk is only allowed
4350 * for major_version==0 superblocks
4351 */
4352 if (mddev->major_version != 0) {
4353 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4354 mdname(mddev));
4355 return -EINVAL;
4356 }
4357
4358 if (!(info->state & (1<<MD_DISK_FAULTY))) {
4359 int err;
4360 rdev = md_import_device (dev, -1, 0);
4361 if (IS_ERR(rdev)) {
4362 printk(KERN_WARNING
4363 "md: error, md_import_device() returned %ld\n",
4364 PTR_ERR(rdev));
4365 return PTR_ERR(rdev);
4366 }
4367 rdev->desc_nr = info->number;
4368 if (info->raid_disk < mddev->raid_disks)
4369 rdev->raid_disk = info->raid_disk;
4370 else
4371 rdev->raid_disk = -1;
4372
1da177e4 4373 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 4374 if (info->state & (1<<MD_DISK_SYNC))
4375 set_bit(In_sync, &rdev->flags);
1da177e4 4376
8ddf9efe
N		 4377 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4378 set_bit(WriteMostly, &rdev->flags);
4379
1da177e4
LT		 4380 if (!mddev->persistent) {
4381 printk(KERN_INFO "md: nonpersistent superblock ...\n");
4382 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4383 } else
4384 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
4385 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
4386
2bf071bf
N		 4387 err = bind_rdev_to_array(rdev, mddev);
4388 if (err) {
4389 export_rdev(rdev);
4390 return err;
4391 }
1da177e4
LT		 4392 }
4393
4394 return 0;
4395}
4396
4397static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4398{
4399 char b[BDEVNAME_SIZE];
4400 mdk_rdev_t *rdev;
4401
1da177e4
LT		 4402 rdev = find_rdev(mddev, dev);
4403 if (!rdev)
4404 return -ENXIO;
4405
4406 if (rdev->raid_disk >= 0)
4407 goto busy;
4408
4409 kick_rdev_from_array(rdev);
850b2b42 4410 md_update_sb(mddev, 1);
d7603b7e 4411 md_new_event(mddev);
1da177e4
LT		 4412
4413 return 0;
4414busy:
fdefa4d8 4415 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
1da177e4
LT		 4416 bdevname(rdev->bdev,b), mdname(mddev));
4417 return -EBUSY;
4418}
4419
4420static int hot_add_disk(mddev_t * mddev, dev_t dev)
4421{
4422 char b[BDEVNAME_SIZE];
4423 int err;
4424 unsigned int size;
4425 mdk_rdev_t *rdev;
4426
4427 if (!mddev->pers)
4428 return -ENODEV;
4429
4430 if (mddev->major_version != 0) {
4431 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4432 " version-0 superblocks.\n",
4433 mdname(mddev));
4434 return -EINVAL;
4435 }
4436 if (!mddev->pers->hot_add_disk) {
4437 printk(KERN_WARNING
4438 "%s: personality does not support diskops!\n",
4439 mdname(mddev));
4440 return -EINVAL;
4441 }
4442
4443 rdev = md_import_device (dev, -1, 0);
4444 if (IS_ERR(rdev)) {
4445 printk(KERN_WARNING
4446 "md: error, md_import_device() returned %ld\n",
4447 PTR_ERR(rdev));
4448 return -EINVAL;
4449 }
4450
4451 if (mddev->persistent)
4452 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
4453 else
4454 rdev->sb_offset =
4455 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4456
4457 size = calc_dev_size(rdev, mddev->chunk_size);
4458 rdev->size = size;
4459
b2d444d7 4460 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4461 printk(KERN_WARNING
4462 "md: can not hot-add faulty %s disk to %s!\n",
4463 bdevname(rdev->bdev,b), mdname(mddev));
4464 err = -EINVAL;
4465 goto abort_export;
4466 }
b2d444d7 4467 clear_bit(In_sync, &rdev->flags);
1da177e4 4468 rdev->desc_nr = -1;
5842730d 4469 rdev->saved_raid_disk = -1;
2bf071bf
N		 4470 err = bind_rdev_to_array(rdev, mddev);
4471 if (err)
4472 goto abort_export;
1da177e4
LT		 4473
4474 /*
4475 * The rest should better be atomic, we can have disk failures
4476 * noticed in interrupt contexts ...
4477 */
4478
4479 if (rdev->desc_nr == mddev->max_disks) {
4480 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
4481 mdname(mddev));
4482 err = -EBUSY;
4483 goto abort_unbind_export;
4484 }
4485
4486 rdev->raid_disk = -1;
4487
850b2b42 4488 md_update_sb(mddev, 1);
1da177e4
LT		 4489
4490 /*
4491 * Kick recovery, maybe this spare has to be added to the
4492 * array immediately.
4493 */
4494 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4495 md_wakeup_thread(mddev->thread);
d7603b7e 4496 md_new_event(mddev);
1da177e4
LT		 4497 return 0;
4498
4499abort_unbind_export:
4500 unbind_rdev_from_array(rdev);
4501
4502abort_export:
4503 export_rdev(rdev);
4504 return err;
4505}
4506
32a7627c
N		 4507static int set_bitmap_file(mddev_t *mddev, int fd)
4508{
4509 int err;
4510
36fa3063
N		 4511 if (mddev->pers) {
4512 if (!mddev->pers->quiesce)
4513 return -EBUSY;
4514 if (mddev->recovery || mddev->sync_thread)
4515 return -EBUSY;
4516 /* we should be able to change the bitmap.. */
4517 }
32a7627c 4518
32a7627c 4519
36fa3063
N		 4520 if (fd >= 0) {
4521 if (mddev->bitmap)
4522 return -EEXIST; /* cannot add when bitmap is present */
4523 mddev->bitmap_file = fget(fd);
32a7627c 4524
36fa3063
N		 4525 if (mddev->bitmap_file == NULL) {
4526 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4527 mdname(mddev));
4528 return -EBADF;
4529 }
4530
4531 err = deny_bitmap_write_access(mddev->bitmap_file);
4532 if (err) {
4533 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4534 mdname(mddev));
4535 fput(mddev->bitmap_file);
4536 mddev->bitmap_file = NULL;
4537 return err;
4538 }
a654b9d8 4539 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 4540 } else if (mddev->bitmap == NULL)
4541 return -ENOENT; /* cannot remove what isn't there */
4542 err = 0;
4543 if (mddev->pers) {
4544 mddev->pers->quiesce(mddev, 1);
4545 if (fd >= 0)
4546 err = bitmap_create(mddev);
d7375ab3 4547 if (fd < 0 || err) {
36fa3063 4548 bitmap_destroy(mddev);
d7375ab3
N		 4549 fd = -1; /* make sure to put the file */
4550 }
36fa3063 4551 mddev->pers->quiesce(mddev, 0);
d7375ab3
N		 4552 }
4553 if (fd < 0) {
acc55e22
N		 4554 if (mddev->bitmap_file) {
4555 restore_bitmap_write_access(mddev->bitmap_file);
36fa3063 4556 fput(mddev->bitmap_file);
acc55e22 4557 }
36fa3063
N		 4558 mddev->bitmap_file = NULL;
4559 }
4560
32a7627c
N		 4561 return err;
4562}
4563
1da177e4
LT		 4564/*
4565 * set_array_info is used two different ways
4566 * The original usage is when creating a new array.
4567 * In this usage, raid_disks is > 0 and it together with
4568 * level, size, not_persistent,layout,chunksize determine the
4569 * shape of the array.
4570 * This will always create an array with a type-0.90.0 superblock.
4571 * The newer usage is when assembling an array.
4572 * In this case raid_disks will be 0, and the major_version field is
4573 * use to determine which style super-blocks are to be found on the devices.
4574 * The minor and patch _version numbers are also kept incase the
4575 * super_block handler wishes to interpret them.
4576 */
4577static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4578{
4579
4580 if (info->raid_disks == 0) {
4581 /* just setting version number for superblock loading */
4582 if (info->major_version < 0 ||
50511da3 4583 info->major_version >= ARRAY_SIZE(super_types) ||
1da177e4
LT		 4584 super_types[info->major_version].name == NULL) {
4585 /* maybe try to auto-load a module? */
4586 printk(KERN_INFO
4587 "md: superblock version %d not known\n",
4588 info->major_version);
4589 return -EINVAL;
4590 }
4591 mddev->major_version = info->major_version;
4592 mddev->minor_version = info->minor_version;
4593 mddev->patch_version = info->patch_version;
3f9d7b0d 4594 mddev->persistent = !info->not_persistent;
1da177e4
LT		 4595 return 0;
4596 }
4597 mddev->major_version = MD_MAJOR_VERSION;
4598 mddev->minor_version = MD_MINOR_VERSION;
4599 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4600 mddev->ctime = get_seconds();
4601
4602 mddev->level = info->level;
17115e03 4603 mddev->clevel[0] = 0;
1da177e4
LT		 4604 mddev->size = info->size;
4605 mddev->raid_disks = info->raid_disks;
4606 /* don't set md_minor, it is determined by which /dev/md* was
4607 * openned
4608 */
4609 if (info->state & (1<<MD_SB_CLEAN))
4610 mddev->recovery_cp = MaxSector;
4611 else
4612 mddev->recovery_cp = 0;
4613 mddev->persistent = ! info->not_persistent;
e691063a 4614 mddev->external = 0;
1da177e4
LT		 4615
4616 mddev->layout = info->layout;
4617 mddev->chunk_size = info->chunk_size;
4618
4619 mddev->max_disks = MD_SB_DISKS;
4620
e691063a
N		 4621 if (mddev->persistent)
4622 mddev->flags = 0;
850b2b42 4623 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 4624
b2a2703c
N		 4625 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4626 mddev->bitmap_offset = 0;
4627
f6705578
N		 4628 mddev->reshape_position = MaxSector;
4629
1da177e4
LT		 4630 /*
4631 * Generate a 128 bit UUID
4632 */
4633 get_random_bytes(mddev->uuid, 16);
4634
f6705578
N		 4635 mddev->new_level = mddev->level;
4636 mddev->new_chunk = mddev->chunk_size;
4637 mddev->new_layout = mddev->layout;
4638 mddev->delta_disks = 0;
4639
1da177e4
LT		 4640 return 0;
4641}
4642
a35b0d69
N		 4643static int update_size(mddev_t *mddev, unsigned long size)
4644{
4645 mdk_rdev_t * rdev;
4646 int rv;
4647 struct list_head *tmp;
8ddeeae5 4648 int fit = (size == 0);
a35b0d69
N		 4649
4650 if (mddev->pers->resize == NULL)
4651 return -EINVAL;
4652 /* The "size" is the amount of each device that is used.
4653 * This can only make sense for arrays with redundancy.
4654 * linear and raid0 always use whatever space is available
4655 * We can only consider changing the size if no resync
4656 * or reconstruction is happening, and if the new size
4657 * is acceptable. It must fit before the sb_offset or,
4658 * if that is <data_offset, it must fit before the
4659 * size of each device.
4660 * If size is zero, we find the largest size that fits.
4661 */
4662 if (mddev->sync_thread)
4663 return -EBUSY;
d089c6af 4664 rdev_for_each(rdev, tmp, mddev) {
a35b0d69 4665 sector_t avail;
01ab5662
N		 4666 avail = rdev->size * 2;
4667
a35b0d69
N		 4668 if (fit && (size == 0 || size > avail/2))
4669 size = avail/2;
4670 if (avail < ((sector_t)size << 1))
4671 return -ENOSPC;
4672 }
4673 rv = mddev->pers->resize(mddev, (sector_t)size *2);
4674 if (!rv) {
4675 struct block_device *bdev;
4676
4677 bdev = bdget_disk(mddev->gendisk, 0);
4678 if (bdev) {
1b1dcc1b 4679 mutex_lock(&bdev->bd_inode->i_mutex);
6d89332b 4680 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
1b1dcc1b 4681 mutex_unlock(&bdev->bd_inode->i_mutex);
a35b0d69
N		 4682 bdput(bdev);
4683 }
4684 }
4685 return rv;
4686}
4687
da943b99
N		 4688static int update_raid_disks(mddev_t *mddev, int raid_disks)
4689{
4690 int rv;
4691 /* change the number of raid disks */
63c70c4f 4692 if (mddev->pers->check_reshape == NULL)
da943b99
N		 4693 return -EINVAL;
4694 if (raid_disks <= 0 ||
4695 raid_disks >= mddev->max_disks)
4696 return -EINVAL;
63c70c4f 4697 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
da943b99 4698 return -EBUSY;
63c70c4f
N		 4699 mddev->delta_disks = raid_disks - mddev->raid_disks;
4700
4701 rv = mddev->pers->check_reshape(mddev);
da943b99
N		 4702 return rv;
4703}
4704
4705
1da177e4
LT		 4706/*
4707 * update_array_info is used to change the configuration of an
4708 * on-line array.
4709 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4710 * fields in the info are checked against the array.
4711 * Any differences that cannot be handled will cause an error.
4712 * Normally, only one change can be managed at a time.
4713 */
4714static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4715{
4716 int rv = 0;
4717 int cnt = 0;
36fa3063
N		 4718 int state = 0;
4719
4720 /* calculate expected state,ignoring low bits */
4721 if (mddev->bitmap && mddev->bitmap_offset)
4722 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 4723
4724 if (mddev->major_version != info->major_version ||
4725 mddev->minor_version != info->minor_version ||
4726/* mddev->patch_version != info->patch_version || */
4727 mddev->ctime != info->ctime ||
4728 mddev->level != info->level ||
4729/* mddev->layout != info->layout || */
4730 !mddev->persistent != info->not_persistent||
36fa3063
N		 4731 mddev->chunk_size != info->chunk_size ||
4732 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4733 ((state^info->state) & 0xfffffe00)
4734 )
1da177e4
LT		 4735 return -EINVAL;
4736 /* Check there is only one change */
284ae7ca 4737 if (info->size >= 0 && mddev->size != info->size) cnt++;
1da177e4
LT		 4738 if (mddev->raid_disks != info->raid_disks) cnt++;
4739 if (mddev->layout != info->layout) cnt++;
36fa3063 4740 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 4741 if (cnt == 0) return 0;
4742 if (cnt > 1) return -EINVAL;
4743
4744 if (mddev->layout != info->layout) {
4745 /* Change layout
4746 * we don't need to do anything at the md level, the
4747 * personality will take care of it all.
4748 */
4749 if (mddev->pers->reconfig == NULL)
4750 return -EINVAL;
4751 else
4752 return mddev->pers->reconfig(mddev, info->layout, -1);
4753 }
284ae7ca 4754 if (info->size >= 0 && mddev->size != info->size)
a35b0d69
N		 4755 rv = update_size(mddev, info->size);
4756
da943b99
N		 4757 if (mddev->raid_disks != info->raid_disks)
4758 rv = update_raid_disks(mddev, info->raid_disks);
4759
36fa3063
N		 4760 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4761 if (mddev->pers->quiesce == NULL)
4762 return -EINVAL;
4763 if (mddev->recovery || mddev->sync_thread)
4764 return -EBUSY;
4765 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4766 /* add the bitmap */
4767 if (mddev->bitmap)
4768 return -EEXIST;
4769 if (mddev->default_bitmap_offset == 0)
4770 return -EINVAL;
4771 mddev->bitmap_offset = mddev->default_bitmap_offset;
4772 mddev->pers->quiesce(mddev, 1);
4773 rv = bitmap_create(mddev);
4774 if (rv)
4775 bitmap_destroy(mddev);
4776 mddev->pers->quiesce(mddev, 0);
4777 } else {
4778 /* remove the bitmap */
4779 if (!mddev->bitmap)
4780 return -ENOENT;
4781 if (mddev->bitmap->file)
4782 return -EINVAL;
4783 mddev->pers->quiesce(mddev, 1);
4784 bitmap_destroy(mddev);
4785 mddev->pers->quiesce(mddev, 0);
4786 mddev->bitmap_offset = 0;
4787 }
4788 }
850b2b42 4789 md_update_sb(mddev, 1);
1da177e4
LT		 4790 return rv;
4791}
4792
4793static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4794{
4795 mdk_rdev_t *rdev;
4796
4797 if (mddev->pers == NULL)
4798 return -ENODEV;
4799
4800 rdev = find_rdev(mddev, dev);
4801 if (!rdev)
4802 return -ENODEV;
4803
4804 md_error(mddev, rdev);
4805 return 0;
4806}
4807
a885c8c4
CH		 4808static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4809{
4810 mddev_t *mddev = bdev->bd_disk->private_data;
4811
4812 geo->heads = 2;
4813 geo->sectors = 4;
4814 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4815 return 0;
4816}
4817
1da177e4
LT		 4818static int md_ioctl(struct inode *inode, struct file *file,
4819 unsigned int cmd, unsigned long arg)
4820{
4821 int err = 0;
4822 void __user *argp = (void __user *)arg;
1da177e4
LT		 4823 mddev_t *mddev = NULL;
4824
4825 if (!capable(CAP_SYS_ADMIN))
4826 return -EACCES;
4827
4828 /*
4829 * Commands dealing with the RAID driver but not any
4830 * particular array:
4831 */
4832 switch (cmd)
4833 {
4834 case RAID_VERSION:
4835 err = get_version(argp);
4836 goto done;
4837
4838 case PRINT_RAID_DEBUG:
4839 err = 0;
4840 md_print_devices();
4841 goto done;
4842
4843#ifndef MODULE
4844 case RAID_AUTORUN:
4845 err = 0;
4846 autostart_arrays(arg);
4847 goto done;
4848#endif
4849 default:;
4850 }
4851
4852 /*
4853 * Commands creating/starting a new array:
4854 */
4855
4856 mddev = inode->i_bdev->bd_disk->private_data;
4857
4858 if (!mddev) {
4859 BUG();
4860 goto abort;
4861 }
4862
1da177e4
LT		 4863 err = mddev_lock(mddev);
4864 if (err) {
4865 printk(KERN_INFO
4866 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4867 err, cmd);
4868 goto abort;
4869 }
4870
4871 switch (cmd)
4872 {
4873 case SET_ARRAY_INFO:
4874 {
4875 mdu_array_info_t info;
4876 if (!arg)
4877 memset(&info, 0, sizeof(info));
4878 else if (copy_from_user(&info, argp, sizeof(info))) {
4879 err = -EFAULT;
4880 goto abort_unlock;
4881 }
4882 if (mddev->pers) {
4883 err = update_array_info(mddev, &info);
4884 if (err) {
4885 printk(KERN_WARNING "md: couldn't update"
4886 " array info. %d\n", err);
4887 goto abort_unlock;
4888 }
4889 goto done_unlock;
4890 }
4891 if (!list_empty(&mddev->disks)) {
4892 printk(KERN_WARNING
4893 "md: array %s already has disks!\n",
4894 mdname(mddev));
4895 err = -EBUSY;
4896 goto abort_unlock;
4897 }
4898 if (mddev->raid_disks) {
4899 printk(KERN_WARNING
4900 "md: array %s already initialised!\n",
4901 mdname(mddev));
4902 err = -EBUSY;
4903 goto abort_unlock;
4904 }
4905 err = set_array_info(mddev, &info);
4906 if (err) {
4907 printk(KERN_WARNING "md: couldn't set"
4908 " array info. %d\n", err);
4909 goto abort_unlock;
4910 }
4911 }
4912 goto done_unlock;
4913
4914 default:;
4915 }
4916
4917 /*
4918 * Commands querying/configuring an existing array:
4919 */
32a7627c 4920 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3f9d7b0d 4921 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
a17184a9
N		 4922 if ((!mddev->raid_disks && !mddev->external)
4923 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4924 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4925 && cmd != GET_BITMAP_FILE) {
1da177e4
LT		 4926 err = -ENODEV;
4927 goto abort_unlock;
4928 }
4929
4930 /*
4931 * Commands even a read-only array can execute:
4932 */
4933 switch (cmd)
4934 {
4935 case GET_ARRAY_INFO:
4936 err = get_array_info(mddev, argp);
4937 goto done_unlock;
4938
32a7627c 4939 case GET_BITMAP_FILE:
87162a28 4940 err = get_bitmap_file(mddev, argp);
32a7627c
N		 4941 goto done_unlock;
4942
1da177e4
LT		 4943 case GET_DISK_INFO:
4944 err = get_disk_info(mddev, argp);
4945 goto done_unlock;
4946
4947 case RESTART_ARRAY_RW:
4948 err = restart_array(mddev);
4949 goto done_unlock;
4950
4951 case STOP_ARRAY:
4952 err = do_md_stop (mddev, 0);
4953 goto done_unlock;
4954
4955 case STOP_ARRAY_RO:
4956 err = do_md_stop (mddev, 1);
4957 goto done_unlock;
4958
4959 /*
4960 * We have a problem here : there is no easy way to give a CHS
4961 * virtual geometry. We currently pretend that we have a 2 heads
4962 * 4 sectors (with a BIG number of cylinders...). This drives
4963 * dosfs just mad... ;-)
4964 */
1da177e4
LT		 4965 }
4966
4967 /*
4968 * The remaining ioctls are changing the state of the
f91de92e
N		 4969 * superblock, so we do not allow them on read-only arrays.
4970 * However non-MD ioctls (e.g. get-size) will still come through
4971 * here and hit the 'default' below, so only disallow
4972 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 4973 */
f91de92e
N		 4974 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4975 mddev->ro && mddev->pers) {
4976 if (mddev->ro == 2) {
4977 mddev->ro = 0;
0fd62b86
NB		 4978 sysfs_notify(&mddev->kobj, NULL, "array_state");
4979 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4980 md_wakeup_thread(mddev->thread);
f91de92e
N		 4981
4982 } else {
4983 err = -EROFS;
4984 goto abort_unlock;
4985 }
1da177e4
LT		 4986 }
4987
4988 switch (cmd)
4989 {
4990 case ADD_NEW_DISK:
4991 {
4992 mdu_disk_info_t info;
4993 if (copy_from_user(&info, argp, sizeof(info)))
4994 err = -EFAULT;
4995 else
4996 err = add_new_disk(mddev, &info);
4997 goto done_unlock;
4998 }
4999
5000 case HOT_REMOVE_DISK:
5001 err = hot_remove_disk(mddev, new_decode_dev(arg));
5002 goto done_unlock;
5003
5004 case HOT_ADD_DISK:
5005 err = hot_add_disk(mddev, new_decode_dev(arg));
5006 goto done_unlock;
5007
5008 case SET_DISK_FAULTY:
5009 err = set_disk_faulty(mddev, new_decode_dev(arg));
5010 goto done_unlock;
5011
5012 case RUN_ARRAY:
5013 err = do_md_run (mddev);
5014 goto done_unlock;
5015
32a7627c
N		 5016 case SET_BITMAP_FILE:
5017 err = set_bitmap_file(mddev, (int)arg);
5018 goto done_unlock;
5019
1da177e4 5020 default:
1da177e4
LT		 5021 err = -EINVAL;
5022 goto abort_unlock;
5023 }
5024
5025done_unlock:
5026abort_unlock:
5027 mddev_unlock(mddev);
5028
5029 return err;
5030done:
5031 if (err)
5032 MD_BUG();
5033abort:
5034 return err;
5035}
5036
5037static int md_open(struct inode *inode, struct file *file)
5038{
5039 /*
5040 * Succeed if we can lock the mddev, which confirms that
5041 * it isn't being stopped right now.
5042 */
5043 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
5044 int err;
5045
d63a5a74 5046 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
1da177e4
LT		 5047 goto out;
5048
5049 err = 0;
5050 mddev_get(mddev);
5051 mddev_unlock(mddev);
5052
5053 check_disk_change(inode->i_bdev);
5054 out:
5055 return err;
5056}
5057
5058static int md_release(struct inode *inode, struct file * file)
5059{
5060 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
5061
52e5f9d1 5062 BUG_ON(!mddev);
1da177e4
LT		 5063 mddev_put(mddev);
5064
5065 return 0;
5066}
5067
44ce6294
LT		 5068static int md_media_changed(struct gendisk *disk)
5069{
5070 mddev_t *mddev = disk->private_data;
5071
5072 return mddev->changed;
5073}
5074
5075static int md_revalidate(struct gendisk *disk)
5076{
5077 mddev_t *mddev = disk->private_data;
5078
5079 mddev->changed = 0;
5080 return 0;
5081}
1da177e4
LT		 5082static struct block_device_operations md_fops =
5083{
5084 .owner = THIS_MODULE,
5085 .open = md_open,
5086 .release = md_release,
5087 .ioctl = md_ioctl,
a885c8c4 5088 .getgeo = md_getgeo,
44ce6294
LT		 5089 .media_changed = md_media_changed,
5090 .revalidate_disk= md_revalidate,
1da177e4
LT		 5091};
5092
75c96f85 5093static int md_thread(void * arg)
1da177e4
LT		 5094{
5095 mdk_thread_t *thread = arg;
5096
1da177e4
LT		 5097 /*
5098 * md_thread is a 'system-thread', it's priority should be very
5099 * high. We avoid resource deadlocks individually in each
5100 * raid personality. (RAID5 does preallocation) We also use RR and
5101 * the very same RT priority as kswapd, thus we will never get
5102 * into a priority inversion deadlock.
5103 *
5104 * we definitely have to have equal or higher priority than
5105 * bdflush, otherwise bdflush will deadlock if there are too
5106 * many dirty RAID5 blocks.
5107 */
1da177e4 5108
6985c43f 5109 allow_signal(SIGKILL);
a6fb0934 5110 while (!kthread_should_stop()) {
1da177e4 5111
93588e22
N		 5112 /* We need to wait INTERRUPTIBLE so that
5113 * we don't add to the load-average.
5114 * That means we need to be sure no signals are
5115 * pending
5116 */
5117 if (signal_pending(current))
5118 flush_signals(current);
5119
5120 wait_event_interruptible_timeout
5121 (thread->wqueue,
5122 test_bit(THREAD_WAKEUP, &thread->flags)
5123 || kthread_should_stop(),
5124 thread->timeout);
1da177e4
LT		 5125
5126 clear_bit(THREAD_WAKEUP, &thread->flags);
5127
787453c2 5128 thread->run(thread->mddev);
1da177e4 5129 }
a6fb0934 5130
1da177e4
LT		 5131 return 0;
5132}
5133
5134void md_wakeup_thread(mdk_thread_t *thread)
5135{
5136 if (thread) {
5137 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5138 set_bit(THREAD_WAKEUP, &thread->flags);
5139 wake_up(&thread->wqueue);
5140 }
5141}
5142
5143mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5144 const char *name)
5145{
5146 mdk_thread_t *thread;
1da177e4 5147
9ffae0cf 5148 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 5149 if (!thread)
5150 return NULL;
5151
1da177e4
LT		 5152 init_waitqueue_head(&thread->wqueue);
5153
1da177e4
LT		 5154 thread->run = run;
5155 thread->mddev = mddev;
32a7627c 5156 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 5157 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 5158 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 5159 kfree(thread);
5160 return NULL;
5161 }
1da177e4
LT		 5162 return thread;
5163}
5164
1da177e4
LT		 5165void md_unregister_thread(mdk_thread_t *thread)
5166{
ba25f9dc 5167 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
a6fb0934
N		 5168
5169 kthread_stop(thread->tsk);
1da177e4
LT		 5170 kfree(thread);
5171}
5172
5173void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
5174{
5175 if (!mddev) {
5176 MD_BUG();
5177 return;
5178 }
5179
b2d444d7 5180 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 5181 return;
6bfe0b49
DW		 5182
5183 if (mddev->external)
5184 set_bit(Blocked, &rdev->flags);
32a7627c 5185/*
1da177e4
LT		 5186 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5187 mdname(mddev),
5188 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5189 __builtin_return_address(0),__builtin_return_address(1),
5190 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 5191*/
d0a0a5ee
AM		 5192 if (!mddev->pers)
5193 return;
1da177e4
LT		 5194 if (!mddev->pers->error_handler)
5195 return;
5196 mddev->pers->error_handler(mddev,rdev);
72a23c21
NB		 5197 if (mddev->degraded)
5198 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
52664732 5199 set_bit(StateChanged, &rdev->flags);
1da177e4
LT		 5200 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5201 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5202 md_wakeup_thread(mddev->thread);
c331eb04 5203 md_new_event_inintr(mddev);
1da177e4
LT		 5204}
5205
5206/* seq_file implementation /proc/mdstat */
5207
5208static void status_unused(struct seq_file *seq)
5209{
5210 int i = 0;
5211 mdk_rdev_t *rdev;
5212 struct list_head *tmp;
5213
5214 seq_printf(seq, "unused devices: ");
5215
73c34431 5216 rdev_for_each_list(rdev, tmp, pending_raid_disks) {
1da177e4
LT		 5217 char b[BDEVNAME_SIZE];
5218 i++;
5219 seq_printf(seq, "%s ",
5220 bdevname(rdev->bdev,b));
5221 }
5222 if (!i)
5223 seq_printf(seq, "<none>");
5224
5225 seq_printf(seq, "\n");
5226}
5227
5228
5229static void status_resync(struct seq_file *seq, mddev_t * mddev)
5230{
4588b42e
N		 5231 sector_t max_blocks, resync, res;
5232 unsigned long dt, db, rt;
5233 int scale;
5234 unsigned int per_milli;
1da177e4
LT		 5235
5236 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
5237
5238 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5239 max_blocks = mddev->resync_max_sectors >> 1;
5240 else
5241 max_blocks = mddev->size;
5242
5243 /*
5244 * Should not happen.
5245 */
5246 if (!max_blocks) {
5247 MD_BUG();
5248 return;
5249 }
4588b42e
N		 5250 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5251 * in a sector_t, and (max_blocks>>scale) will fit in a
5252 * u32, as those are the requirements for sector_div.
5253 * Thus 'scale' must be at least 10
5254 */
5255 scale = 10;
5256 if (sizeof(sector_t) > sizeof(unsigned long)) {
5257 while ( max_blocks/2 > (1ULL<<(scale+32)))
5258 scale++;
5259 }
5260 res = (resync>>scale)*1000;
5261 sector_div(res, (u32)((max_blocks>>scale)+1));
5262
5263 per_milli = res;
1da177e4 5264 {
4588b42e 5265 int i, x = per_milli/50, y = 20-x;
1da177e4
LT		 5266 seq_printf(seq, "[");
5267 for (i = 0; i < x; i++)
5268 seq_printf(seq, "=");
5269 seq_printf(seq, ">");
5270 for (i = 0; i < y; i++)
5271 seq_printf(seq, ".");
5272 seq_printf(seq, "] ");
5273 }
4588b42e 5274 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
ccfcc3c1
N		 5275 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5276 "reshape" :
61df9d91
N		 5277 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5278 "check" :
5279 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5280 "resync" : "recovery"))),
5281 per_milli/10, per_milli % 10,
4588b42e
N		 5282 (unsigned long long) resync,
5283 (unsigned long long) max_blocks);
1da177e4
LT		 5284
5285 /*
5286 * We do not want to overflow, so the order of operands and
5287 * the * 100 / 100 trick are important. We do a +1 to be
5288 * safe against division by zero. We only estimate anyway.
5289 *
5290 * dt: time from mark until now
5291 * db: blocks written from mark until now
5292 * rt: remaining time
5293 */
5294 dt = ((jiffies - mddev->resync_mark) / HZ);
5295 if (!dt) dt++;
ff4e8d9a
N		 5296 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5297 - mddev->resync_mark_cnt;
5298 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
1da177e4
LT		 5299
5300 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
5301
ff4e8d9a 5302 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
1da177e4
LT		 5303}
5304
5305static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5306{
5307 struct list_head *tmp;
5308 loff_t l = *pos;
5309 mddev_t *mddev;
5310
5311 if (l >= 0x10000)
5312 return NULL;
5313 if (!l--)
5314 /* header */
5315 return (void*)1;
5316
5317 spin_lock(&all_mddevs_lock);
5318 list_for_each(tmp,&all_mddevs)
5319 if (!l--) {
5320 mddev = list_entry(tmp, mddev_t, all_mddevs);
5321 mddev_get(mddev);
5322 spin_unlock(&all_mddevs_lock);
5323 return mddev;
5324 }
5325 spin_unlock(&all_mddevs_lock);
5326 if (!l--)
5327 return (void*)2;/* tail */
5328 return NULL;
5329}
5330
5331static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
5332{
5333 struct list_head *tmp;
5334 mddev_t *next_mddev, *mddev = v;
5335
5336 ++*pos;
5337 if (v == (void*)2)
5338 return NULL;
5339
5340 spin_lock(&all_mddevs_lock);
5341 if (v == (void*)1)
5342 tmp = all_mddevs.next;
5343 else
5344 tmp = mddev->all_mddevs.next;
5345 if (tmp != &all_mddevs)
5346 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
5347 else {
5348 next_mddev = (void*)2;
5349 *pos = 0x10000;
5350 }
5351 spin_unlock(&all_mddevs_lock);
5352
5353 if (v != (void*)1)
5354 mddev_put(mddev);
5355 return next_mddev;
5356
5357}
5358
5359static void md_seq_stop(struct seq_file *seq, void *v)
5360{
5361 mddev_t *mddev = v;
5362
5363 if (mddev && v != (void*)1 && v != (void*)2)
5364 mddev_put(mddev);
5365}
5366
d7603b7e
N		 5367struct mdstat_info {
5368 int event;
5369};
5370
1da177e4
LT		 5371static int md_seq_show(struct seq_file *seq, void *v)
5372{
5373 mddev_t *mddev = v;
5374 sector_t size;
5375 struct list_head *tmp2;
5376 mdk_rdev_t *rdev;
d7603b7e 5377 struct mdstat_info *mi = seq->private;
32a7627c 5378 struct bitmap *bitmap;
1da177e4
LT		 5379
5380 if (v == (void*)1) {
2604b703 5381 struct mdk_personality *pers;
1da177e4
LT		 5382 seq_printf(seq, "Personalities : ");
5383 spin_lock(&pers_lock);
2604b703
N		 5384 list_for_each_entry(pers, &pers_list, list)
5385 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT		 5386
5387 spin_unlock(&pers_lock);
5388 seq_printf(seq, "\n");
d7603b7e 5389 mi->event = atomic_read(&md_event_count);
1da177e4
LT		 5390 return 0;
5391 }
5392 if (v == (void*)2) {
5393 status_unused(seq);
5394 return 0;
5395 }
5396
5dc5cf7d 5397 if (mddev_lock(mddev) < 0)
1da177e4 5398 return -EINTR;
5dc5cf7d 5399
1da177e4
LT		 5400 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5401 seq_printf(seq, "%s : %sactive", mdname(mddev),
5402 mddev->pers ? "" : "in");
5403 if (mddev->pers) {
f91de92e 5404 if (mddev->ro==1)
1da177e4 5405 seq_printf(seq, " (read-only)");
f91de92e 5406 if (mddev->ro==2)
52720ae7 5407 seq_printf(seq, " (auto-read-only)");
1da177e4
LT		 5408 seq_printf(seq, " %s", mddev->pers->name);
5409 }
5410
5411 size = 0;
d089c6af 5412 rdev_for_each(rdev, tmp2, mddev) {
1da177e4
LT		 5413 char b[BDEVNAME_SIZE];
5414 seq_printf(seq, " %s[%d]",
5415 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 5416 if (test_bit(WriteMostly, &rdev->flags))
5417 seq_printf(seq, "(W)");
b2d444d7 5418 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 5419 seq_printf(seq, "(F)");
5420 continue;
b325a32e
N		 5421 } else if (rdev->raid_disk < 0)
5422 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 5423 size += rdev->size;
5424 }
5425
5426 if (!list_empty(&mddev->disks)) {
5427 if (mddev->pers)
5428 seq_printf(seq, "\n %llu blocks",
5429 (unsigned long long)mddev->array_size);
5430 else
5431 seq_printf(seq, "\n %llu blocks",
5432 (unsigned long long)size);
5433 }
1cd6bf19
N		 5434 if (mddev->persistent) {
5435 if (mddev->major_version != 0 ||
5436 mddev->minor_version != 90) {
5437 seq_printf(seq," super %d.%d",
5438 mddev->major_version,
5439 mddev->minor_version);
5440 }
e691063a
N		 5441 } else if (mddev->external)
5442 seq_printf(seq, " super external:%s",
5443 mddev->metadata_type);
5444 else
1cd6bf19 5445 seq_printf(seq, " super non-persistent");
1da177e4
LT		 5446
5447 if (mddev->pers) {
5448 mddev->pers->status (seq, mddev);
5449 seq_printf(seq, "\n ");
8e1b39d6
N		 5450 if (mddev->pers->sync_request) {
5451 if (mddev->curr_resync > 2) {
5452 status_resync (seq, mddev);
5453 seq_printf(seq, "\n ");
5454 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5455 seq_printf(seq, "\tresync=DELAYED\n ");
5456 else if (mddev->recovery_cp < MaxSector)
5457 seq_printf(seq, "\tresync=PENDING\n ");
5458 }
32a7627c
N		 5459 } else
5460 seq_printf(seq, "\n ");
5461
5462 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 5463 unsigned long chunk_kb;
5464 unsigned long flags;
32a7627c
N		 5465 spin_lock_irqsave(&bitmap->lock, flags);
5466 chunk_kb = bitmap->chunksize >> 10;
5467 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5468 "%lu%s chunk",
5469 bitmap->pages - bitmap->missing_pages,
5470 bitmap->pages,
5471 (bitmap->pages - bitmap->missing_pages)
5472 << (PAGE_SHIFT - 10),
5473 chunk_kb ? chunk_kb : bitmap->chunksize,
5474 chunk_kb ? "KB" : "B");
78d742d8
N		 5475 if (bitmap->file) {
5476 seq_printf(seq, ", file: ");
c32c2f63 5477 seq_path(seq, &bitmap->file->f_path, " \t\n");
32a7627c 5478 }
78d742d8 5479
32a7627c
N		 5480 seq_printf(seq, "\n");
5481 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 5482 }
5483
5484 seq_printf(seq, "\n");
5485 }
5486 mddev_unlock(mddev);
5487
5488 return 0;
5489}
5490
5491static struct seq_operations md_seq_ops = {
5492 .start = md_seq_start,
5493 .next = md_seq_next,
5494 .stop = md_seq_stop,
5495 .show = md_seq_show,
5496};
5497
5498static int md_seq_open(struct inode *inode, struct file *file)
5499{
5500 int error;
d7603b7e
N		 5501 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5502 if (mi == NULL)
5503 return -ENOMEM;
1da177e4
LT		 5504
5505 error = seq_open(file, &md_seq_ops);
d7603b7e
N		 5506 if (error)
5507 kfree(mi);
5508 else {
5509 struct seq_file *p = file->private_data;
5510 p->private = mi;
5511 mi->event = atomic_read(&md_event_count);
5512 }
1da177e4
LT		 5513 return error;
5514}
5515
d7603b7e
N		 5516static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5517{
5518 struct seq_file *m = filp->private_data;
5519 struct mdstat_info *mi = m->private;
5520 int mask;
5521
5522 poll_wait(filp, &md_event_waiters, wait);
5523
5524 /* always allow read */
5525 mask = POLLIN | POLLRDNORM;
5526
5527 if (mi->event != atomic_read(&md_event_count))
5528 mask |= POLLERR | POLLPRI;
5529 return mask;
5530}
5531
fa027c2a 5532static const struct file_operations md_seq_fops = {
e24650c2 5533 .owner = THIS_MODULE,
1da177e4
LT		 5534 .open = md_seq_open,
5535 .read = seq_read,
5536 .llseek = seq_lseek,
c3f94b40 5537 .release = seq_release_private,
d7603b7e 5538 .poll = mdstat_poll,
1da177e4
LT		 5539};
5540
2604b703 5541int register_md_personality(struct mdk_personality *p)
1da177e4 5542{
1da177e4 5543 spin_lock(&pers_lock);
2604b703
N		 5544 list_add_tail(&p->list, &pers_list);
5545 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
1da177e4
LT		 5546 spin_unlock(&pers_lock);
5547 return 0;
5548}
5549
2604b703 5550int unregister_md_personality(struct mdk_personality *p)
1da177e4 5551{
2604b703 5552 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 5553 spin_lock(&pers_lock);
2604b703 5554 list_del_init(&p->list);
1da177e4
LT		 5555 spin_unlock(&pers_lock);
5556 return 0;
5557}
5558
5559static int is_mddev_idle(mddev_t *mddev)
5560{
5561 mdk_rdev_t * rdev;
5562 struct list_head *tmp;
5563 int idle;
713f6ab1 5564 long curr_events;
1da177e4
LT		 5565
5566 idle = 1;
d089c6af 5567 rdev_for_each(rdev, tmp, mddev) {
1da177e4 5568 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 5569 curr_events = disk_stat_read(disk, sectors[0]) +
5570 disk_stat_read(disk, sectors[1]) -
1da177e4 5571 atomic_read(&disk->sync_io);
713f6ab1
N		 5572 /* sync IO will cause sync_io to increase before the disk_stats
5573 * as sync_io is counted when a request starts, and
5574 * disk_stats is counted when it completes.
5575 * So resync activity will cause curr_events to be smaller than
5576 * when there was no such activity.
5577 * non-sync IO will cause disk_stat to increase without
5578 * increasing sync_io so curr_events will (eventually)
5579 * be larger than it was before. Once it becomes
5580 * substantially larger, the test below will cause
5581 * the array to appear non-idle, and resync will slow
5582 * down.
5583 * If there is a lot of outstanding resync activity when
5584 * we set last_event to curr_events, then all that activity
5585 * completing might cause the array to appear non-idle
5586 * and resync will be slowed down even though there might
5587 * not have been non-resync activity. This will only
5588 * happen once though. 'last_events' will soon reflect
5589 * the state where there is little or no outstanding
5590 * resync requests, and further resync activity will
5591 * always make curr_events less than last_events.
c0e48521 5592 *
1da177e4 5593 */
713f6ab1 5594 if (curr_events - rdev->last_events > 4096) {
1da177e4
LT		 5595 rdev->last_events = curr_events;
5596 idle = 0;
5597 }
5598 }
5599 return idle;
5600}
5601
5602void md_done_sync(mddev_t *mddev, int blocks, int ok)
5603{
5604 /* another "blocks" (512byte) blocks have been synced */
5605 atomic_sub(blocks, &mddev->recovery_active);
5606 wake_up(&mddev->recovery_wait);
5607 if (!ok) {
dfc70645 5608 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 5609 md_wakeup_thread(mddev->thread);
5610 // stop recovery, signal do_sync ....
5611 }
5612}
5613
5614
06d91a5f
N		 5615/* md_write_start(mddev, bi)
5616 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 5617 * in superblock) before writing, schedule a superblock update
5618 * and wait for it to complete.
06d91a5f 5619 */
3d310eb7 5620void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 5621{
0fd62b86 5622 int did_change = 0;
06d91a5f 5623 if (bio_data_dir(bi) != WRITE)
3d310eb7 5624 return;
06d91a5f 5625
f91de92e
N		 5626 BUG_ON(mddev->ro == 1);
5627 if (mddev->ro == 2) {
5628 /* need to switch to read/write */
5629 mddev->ro = 0;
5630 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5631 md_wakeup_thread(mddev->thread);
25156198 5632 md_wakeup_thread(mddev->sync_thread);
0fd62b86 5633 did_change = 1;
f91de92e 5634 }
06d91a5f 5635 atomic_inc(&mddev->writes_pending);
31a59e34
N		 5636 if (mddev->safemode == 1)
5637 mddev->safemode = 0;
06d91a5f 5638 if (mddev->in_sync) {
a9701a30 5639 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 5640 if (mddev->in_sync) {
5641 mddev->in_sync = 0;
850b2b42 5642 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3d310eb7 5643 md_wakeup_thread(mddev->thread);
0fd62b86 5644 did_change = 1;
3d310eb7 5645 }
a9701a30 5646 spin_unlock_irq(&mddev->write_lock);
06d91a5f 5647 }
0fd62b86
NB		 5648 if (did_change)
5649 sysfs_notify(&mddev->kobj, NULL, "array_state");
09a44cc1
N		 5650 wait_event(mddev->sb_wait,
5651 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
5652 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
1da177e4
LT		 5653}
5654
5655void md_write_end(mddev_t *mddev)
5656{
5657 if (atomic_dec_and_test(&mddev->writes_pending)) {
5658 if (mddev->safemode == 2)
5659 md_wakeup_thread(mddev->thread);
16f17b39 5660 else if (mddev->safemode_delay)
1da177e4
LT		 5661 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5662 }
5663}
5664
2a2275d6
N		 5665/* md_allow_write(mddev)
5666 * Calling this ensures that the array is marked 'active' so that writes
5667 * may proceed without blocking. It is important to call this before
5668 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5669 * Must be called with mddev_lock held.
5670 */
5671void md_allow_write(mddev_t *mddev)
5672{
5673 if (!mddev->pers)
5674 return;
5675 if (mddev->ro)
5676 return;
1a0fd497
NB		 5677 if (!mddev->pers->sync_request)
5678 return;
2a2275d6
N		 5679
5680 spin_lock_irq(&mddev->write_lock);
5681 if (mddev->in_sync) {
5682 mddev->in_sync = 0;
5683 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5684 if (mddev->safemode_delay &&
5685 mddev->safemode == 0)
5686 mddev->safemode = 1;
5687 spin_unlock_irq(&mddev->write_lock);
5688 md_update_sb(mddev, 0);
09a44cc1
N		 5689
5690 sysfs_notify(&mddev->kobj, NULL, "array_state");
5691 /* wait for the dirty state to be recorded in the metadata */
5692 wait_event(mddev->sb_wait,
5693 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
5694 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
2a2275d6
N		 5695 } else
5696 spin_unlock_irq(&mddev->write_lock);
5697}
5698EXPORT_SYMBOL_GPL(md_allow_write);
5699
1da177e4
LT		 5700#define SYNC_MARKS 10
5701#define SYNC_MARK_STEP (3*HZ)
29269553 5702void md_do_sync(mddev_t *mddev)
1da177e4
LT		 5703{
5704 mddev_t *mddev2;
5705 unsigned int currspeed = 0,
5706 window;
57afd89f 5707 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 5708 unsigned long mark[SYNC_MARKS];
5709 sector_t mark_cnt[SYNC_MARKS];
5710 int last_mark,m;
5711 struct list_head *tmp;
5712 sector_t last_check;
57afd89f 5713 int skipped = 0;
5fd6c1dc
N		 5714 struct list_head *rtmp;
5715 mdk_rdev_t *rdev;
61df9d91 5716 char *desc;
1da177e4
LT		 5717
5718 /* just incase thread restarts... */
5719 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5720 return;
5fd6c1dc
N		 5721 if (mddev->ro) /* never try to sync a read-only array */
5722 return;
1da177e4 5723
61df9d91
N		 5724 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5725 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5726 desc = "data-check";
5727 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5728 desc = "requested-resync";
5729 else
5730 desc = "resync";
5731 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5732 desc = "reshape";
5733 else
5734 desc = "recovery";
5735
1da177e4
LT		 5736 /* we overload curr_resync somewhat here.
5737 * 0 == not engaged in resync at all
5738 * 2 == checking that there is no conflict with another sync
5739 * 1 == like 2, but have yielded to allow conflicting resync to
5740 * commense
5741 * other == active in resync - this many blocks
5742 *
5743 * Before starting a resync we must have set curr_resync to
5744 * 2, and then checked that every "conflicting" array has curr_resync
5745 * less than ours. When we find one that is the same or higher
5746 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5747 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5748 * This will mean we have to start checking from the beginning again.
5749 *
5750 */
5751
5752 do {
5753 mddev->curr_resync = 2;
5754
5755 try_again:
787453c2 5756 if (kthread_should_stop()) {
6985c43f 5757 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 5758 goto skip;
5759 }
29ac4aa3 5760 for_each_mddev(mddev2, tmp) {
1da177e4
LT		 5761 if (mddev2 == mddev)
5762 continue;
90b08710
BS		 5763 if (!mddev->parallel_resync
5764 && mddev2->curr_resync
5765 && match_mddev_units(mddev, mddev2)) {
1da177e4
LT		 5766 DEFINE_WAIT(wq);
5767 if (mddev < mddev2 && mddev->curr_resync == 2) {
5768 /* arbitrarily yield */
5769 mddev->curr_resync = 1;
5770 wake_up(&resync_wait);
5771 }
5772 if (mddev > mddev2 && mddev->curr_resync == 1)
5773 /* no need to wait here, we can wait the next
5774 * time 'round when curr_resync == 2
5775 */
5776 continue;
787453c2
N		 5777 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5778 if (!kthread_should_stop() &&
8712e553 5779 mddev2->curr_resync >= mddev->curr_resync) {
61df9d91
N		 5780 printk(KERN_INFO "md: delaying %s of %s"
5781 " until %s has finished (they"
1da177e4 5782 " share one or more physical units)\n",
61df9d91 5783 desc, mdname(mddev), mdname(mddev2));
1da177e4
LT		 5784 mddev_put(mddev2);
5785 schedule();
5786 finish_wait(&resync_wait, &wq);
5787 goto try_again;
5788 }
5789 finish_wait(&resync_wait, &wq);
5790 }
5791 }
5792 } while (mddev->curr_resync < 2);
5793
5fd6c1dc 5794 j = 0;
9d88883e 5795 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 5796 /* resync follows the size requested by the personality,
57afd89f 5797 * which defaults to physical size, but can be virtual size
1da177e4
LT		 5798 */
5799 max_sectors = mddev->resync_max_sectors;
9d88883e 5800 mddev->resync_mismatches = 0;
5fd6c1dc 5801 /* we don't use the checkpoint if there's a bitmap */
5e96ee65
NB		 5802 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5803 j = mddev->resync_min;
5804 else if (!mddev->bitmap)
5fd6c1dc 5805 j = mddev->recovery_cp;
5e96ee65 5806
ccfcc3c1
N		 5807 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5808 max_sectors = mddev->size << 1;
5fd6c1dc 5809 else {
1da177e4
LT		 5810 /* recovery follows the physical size of devices */
5811 max_sectors = mddev->size << 1;
5fd6c1dc 5812 j = MaxSector;
d089c6af 5813 rdev_for_each(rdev, rtmp, mddev)
5fd6c1dc
N		 5814 if (rdev->raid_disk >= 0 &&
5815 !test_bit(Faulty, &rdev->flags) &&
5816 !test_bit(In_sync, &rdev->flags) &&
5817 rdev->recovery_offset < j)
5818 j = rdev->recovery_offset;
5819 }
1da177e4 5820
61df9d91
N		 5821 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5822 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5823 " %d KB/sec/disk.\n", speed_min(mddev));
338cec32 5824 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
61df9d91
N		 5825 "(but not more than %d KB/sec) for %s.\n",
5826 speed_max(mddev), desc);
1da177e4
LT		 5827
5828 is_mddev_idle(mddev); /* this also initializes IO event counters */
5fd6c1dc 5829
57afd89f 5830 io_sectors = 0;
1da177e4
LT		 5831 for (m = 0; m < SYNC_MARKS; m++) {
5832 mark[m] = jiffies;
57afd89f 5833 mark_cnt[m] = io_sectors;
1da177e4
LT		 5834 }
5835 last_mark = 0;
5836 mddev->resync_mark = mark[last_mark];
5837 mddev->resync_mark_cnt = mark_cnt[last_mark];
5838
5839 /*
5840 * Tune reconstruction:
5841 */
5842 window = 32*(PAGE_SIZE/512);
5843 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5844 window/2,(unsigned long long) max_sectors/2);
5845
5846 atomic_set(&mddev->recovery_active, 0);
1da177e4
LT		 5847 last_check = 0;
5848
5849 if (j>2) {
5850 printk(KERN_INFO
61df9d91
N		 5851 "md: resuming %s of %s from checkpoint.\n",
5852 desc, mdname(mddev));
1da177e4
LT		 5853 mddev->curr_resync = j;
5854 }
5855
5856 while (j < max_sectors) {
57afd89f 5857 sector_t sectors;
1da177e4 5858
57afd89f 5859 skipped = 0;
c6207277
N		 5860 if (j >= mddev->resync_max) {
5861 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5862 wait_event(mddev->recovery_wait,
5863 mddev->resync_max > j
5864 || kthread_should_stop());
5865 }
5866 if (kthread_should_stop())
5867 goto interrupted;
57afd89f 5868 sectors = mddev->pers->sync_request(mddev, j, &skipped,
c6207277 5869 currspeed < speed_min(mddev));
57afd89f 5870 if (sectors == 0) {
dfc70645 5871 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 5872 goto out;
5873 }
57afd89f
N		 5874
5875 if (!skipped) { /* actual IO requested */
5876 io_sectors += sectors;
5877 atomic_add(sectors, &mddev->recovery_active);
5878 }
5879
1da177e4
LT		 5880 j += sectors;
5881 if (j>1) mddev->curr_resync = j;
ff4e8d9a 5882 mddev->curr_mark_cnt = io_sectors;
d7603b7e
N		 5883 if (last_check == 0)
5884 /* this is the earliers that rebuilt will be
5885 * visible in /proc/mdstat
5886 */
5887 md_new_event(mddev);
57afd89f
N		 5888
5889 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 5890 continue;
5891
57afd89f 5892 last_check = io_sectors;
1da177e4 5893
dfc70645 5894 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
1da177e4
LT		 5895 break;
5896
5897 repeat:
5898 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5899 /* step marks */
5900 int next = (last_mark+1) % SYNC_MARKS;
5901
5902 mddev->resync_mark = mark[next];
5903 mddev->resync_mark_cnt = mark_cnt[next];
5904 mark[next] = jiffies;
57afd89f 5905 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 5906 last_mark = next;
5907 }
5908
5909
c6207277
N		 5910 if (kthread_should_stop())
5911 goto interrupted;
5912
1da177e4
LT		 5913
5914 /*
5915 * this loop exits only if either when we are slower than
5916 * the 'hard' speed limit, or the system was IO-idle for
5917 * a jiffy.
5918 * the system might be non-idle CPU-wise, but we only care
5919 * about not overloading the IO subsystem. (things like an
5920 * e2fsck being done on the RAID array should execute fast)
5921 */
2ad8b1ef 5922 blk_unplug(mddev->queue);
1da177e4
LT		 5923 cond_resched();
5924
57afd89f
N		 5925 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5926 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4 5927
88202a0c
N		 5928 if (currspeed > speed_min(mddev)) {
5929 if ((currspeed > speed_max(mddev)) ||
1da177e4 5930 !is_mddev_idle(mddev)) {
c0e48521 5931 msleep(500);
1da177e4
LT		 5932 goto repeat;
5933 }
5934 }
5935 }
61df9d91 5936 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
1da177e4
LT		 5937 /*
5938 * this also signals 'finished resyncing' to md_stop
5939 */
5940 out:
2ad8b1ef 5941 blk_unplug(mddev->queue);
1da177e4
LT		 5942
5943 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5944
5945 /* tell personality that we are finished */
57afd89f 5946 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4 5947
dfc70645 5948 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5fd6c1dc
N		 5949 mddev->curr_resync > 2) {
5950 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5951 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5952 if (mddev->curr_resync >= mddev->recovery_cp) {
5953 printk(KERN_INFO
61df9d91
N		 5954 "md: checkpointing %s of %s.\n",
5955 desc, mdname(mddev));
5fd6c1dc
N		 5956 mddev->recovery_cp = mddev->curr_resync;
5957 }
5958 } else
5959 mddev->recovery_cp = MaxSector;
5960 } else {
5961 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5962 mddev->curr_resync = MaxSector;
d089c6af 5963 rdev_for_each(rdev, rtmp, mddev)
5fd6c1dc
N		 5964 if (rdev->raid_disk >= 0 &&
5965 !test_bit(Faulty, &rdev->flags) &&
5966 !test_bit(In_sync, &rdev->flags) &&
5967 rdev->recovery_offset < mddev->curr_resync)
5968 rdev->recovery_offset = mddev->curr_resync;
5fd6c1dc 5969 }
1da177e4 5970 }
17571284 5971 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 5972
1da177e4
LT		 5973 skip:
5974 mddev->curr_resync = 0;
5e96ee65 5975 mddev->resync_min = 0;
c6207277
N		 5976 mddev->resync_max = MaxSector;
5977 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
1da177e4
LT		 5978 wake_up(&resync_wait);
5979 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5980 md_wakeup_thread(mddev->thread);
c6207277
N		 5981 return;
5982
5983 interrupted:
5984 /*
5985 * got a signal, exit.
5986 */
5987 printk(KERN_INFO
5988 "md: md_do_sync() got signal ... exiting\n");
5989 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5990 goto out;
5991
1da177e4 5992}
29269553 5993EXPORT_SYMBOL_GPL(md_do_sync);
1da177e4
LT		 5994
5995
b4c4c7b8
N		 5996static int remove_and_add_spares(mddev_t *mddev)
5997{
5998 mdk_rdev_t *rdev;
5999 struct list_head *rtmp;
6000 int spares = 0;
6001
d089c6af 6002 rdev_for_each(rdev, rtmp, mddev)
b4c4c7b8 6003 if (rdev->raid_disk >= 0 &&
6bfe0b49 6004 !test_bit(Blocked, &rdev->flags) &&
b4c4c7b8
N		 6005 (test_bit(Faulty, &rdev->flags) ||
6006 ! test_bit(In_sync, &rdev->flags)) &&
6007 atomic_read(&rdev->nr_pending)==0) {
6008 if (mddev->pers->hot_remove_disk(
6009 mddev, rdev->raid_disk)==0) {
6010 char nm[20];
6011 sprintf(nm,"rd%d", rdev->raid_disk);
6012 sysfs_remove_link(&mddev->kobj, nm);
6013 rdev->raid_disk = -1;
6014 }
6015 }
6016
6017 if (mddev->degraded) {
dfc70645
N		 6018 rdev_for_each(rdev, rtmp, mddev) {
6019 if (rdev->raid_disk >= 0 &&
6020 !test_bit(In_sync, &rdev->flags))
6021 spares++;
b4c4c7b8
N		 6022 if (rdev->raid_disk < 0
6023 && !test_bit(Faulty, &rdev->flags)) {
6024 rdev->recovery_offset = 0;
199050ea
NB		 6025 if (mddev->pers->
6026 hot_add_disk(mddev, rdev) == 0) {
b4c4c7b8
N		 6027 char nm[20];
6028 sprintf(nm, "rd%d", rdev->raid_disk);
5e55e2f5
N		 6029 if (sysfs_create_link(&mddev->kobj,
6030 &rdev->kobj, nm))
6031 printk(KERN_WARNING
6032 "md: cannot register "
6033 "%s for %s\n",
6034 nm, mdname(mddev));
b4c4c7b8
N		 6035 spares++;
6036 md_new_event(mddev);
6037 } else
6038 break;
6039 }
dfc70645 6040 }
b4c4c7b8
N		 6041 }
6042 return spares;
6043}
1da177e4
LT		 6044/*
6045 * This routine is regularly called by all per-raid-array threads to
6046 * deal with generic issues like resync and super-block update.
6047 * Raid personalities that don't have a thread (linear/raid0) do not
6048 * need this as they never do any recovery or update the superblock.
6049 *
6050 * It does not do any resync itself, but rather "forks" off other threads
6051 * to do that as needed.
6052 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6053 * "->recovery" and create a thread at ->sync_thread.
dfc70645 6054 * When the thread finishes it sets MD_RECOVERY_DONE
1da177e4
LT		 6055 * and wakeups up this thread which will reap the thread and finish up.
6056 * This thread also removes any faulty devices (with nr_pending == 0).
6057 *
6058 * The overall approach is:
6059 * 1/ if the superblock needs updating, update it.
6060 * 2/ If a recovery thread is running, don't do anything else.
6061 * 3/ If recovery has finished, clean up, possibly marking spares active.
6062 * 4/ If there are any faulty devices, remove them.
6063 * 5/ If array is degraded, try to add spares devices
6064 * 6/ If array has spares or is not in-sync, start a resync thread.
6065 */
6066void md_check_recovery(mddev_t *mddev)
6067{
6068 mdk_rdev_t *rdev;
6069 struct list_head *rtmp;
6070
6071
5f40402d
N		 6072 if (mddev->bitmap)
6073 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 6074
6075 if (mddev->ro)
6076 return;
fca4d848
N		 6077
6078 if (signal_pending(current)) {
31a59e34 6079 if (mddev->pers->sync_request && !mddev->external) {
fca4d848
N		 6080 printk(KERN_INFO "md: %s in immediate safe mode\n",
6081 mdname(mddev));
6082 mddev->safemode = 2;
6083 }
6084 flush_signals(current);
6085 }
6086
1da177e4 6087 if ( ! (
e691063a 6088 (mddev->flags && !mddev->external) ||
1da177e4 6089 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848 6090 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
31a59e34 6091 (mddev->external == 0 && mddev->safemode == 1) ||
fca4d848
N		 6092 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6093 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 6094 ))
6095 return;
fca4d848 6096
df5b89b3 6097 if (mddev_trylock(mddev)) {
b4c4c7b8 6098 int spares = 0;
fca4d848 6099
31a59e34 6100 if (!mddev->external) {
0fd62b86 6101 int did_change = 0;
31a59e34
N		 6102 spin_lock_irq(&mddev->write_lock);
6103 if (mddev->safemode &&
6104 !atomic_read(&mddev->writes_pending) &&
6105 !mddev->in_sync &&
6106 mddev->recovery_cp == MaxSector) {
6107 mddev->in_sync = 1;
0fd62b86 6108 did_change = 1;
31a59e34
N		 6109 if (mddev->persistent)
6110 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6111 }
6112 if (mddev->safemode == 1)
6113 mddev->safemode = 0;
6114 spin_unlock_irq(&mddev->write_lock);
0fd62b86
NB		 6115 if (did_change)
6116 sysfs_notify(&mddev->kobj, NULL, "array_state");
fca4d848 6117 }
fca4d848 6118
850b2b42
N		 6119 if (mddev->flags)
6120 md_update_sb(mddev, 0);
06d91a5f 6121
52664732
NB		 6122 rdev_for_each(rdev, rtmp, mddev)
6123 if (test_and_clear_bit(StateChanged, &rdev->flags))
6124 sysfs_notify(&rdev->kobj, NULL, "state");
6125
06d91a5f 6126
1da177e4
LT		 6127 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6128 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6129 /* resync/recovery still happening */
6130 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6131 goto unlock;
6132 }
6133 if (mddev->sync_thread) {
6134 /* resync has finished, collect result */
6135 md_unregister_thread(mddev->sync_thread);
6136 mddev->sync_thread = NULL;
dfc70645 6137 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
1da177e4
LT		 6138 /* success...*/
6139 /* activate any spares */
a99ac971
NB		 6140 if (mddev->pers->spare_active(mddev))
6141 sysfs_notify(&mddev->kobj, NULL,
6142 "degraded");
1da177e4 6143 }
850b2b42 6144 md_update_sb(mddev, 1);
41158c7e
N		 6145
6146 /* if array is no-longer degraded, then any saved_raid_disk
6147 * information must be scrapped
6148 */
6149 if (!mddev->degraded)
d089c6af 6150 rdev_for_each(rdev, rtmp, mddev)
41158c7e
N		 6151 rdev->saved_raid_disk = -1;
6152
1da177e4
LT		 6153 mddev->recovery = 0;
6154 /* flag recovery needed just to double check */
6155 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
72a23c21 6156 sysfs_notify(&mddev->kobj, NULL, "sync_action");
d7603b7e 6157 md_new_event(mddev);
1da177e4
LT		 6158 goto unlock;
6159 }
72a23c21
NB		 6160 /* Set RUNNING before clearing NEEDED to avoid
6161 * any transients in the value of "sync_action".
6162 */
6163 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6164 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d
N		 6165 /* Clear some bits that don't mean anything, but
6166 * might be left set
6167 */
24dd469d
N		 6168 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6169 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4 6170
5fd6c1dc
N		 6171 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6172 goto unlock;
1da177e4
LT		 6173 /* no recovery is running.
6174 * remove any failed drives, then
6175 * add spares if possible.
6176 * Spare are also removed and re-added, to allow
6177 * the personality to fail the re-add.
6178 */
1da177e4 6179
b4c4c7b8
N		 6180 if (mddev->reshape_position != MaxSector) {
6181 if (mddev->pers->check_reshape(mddev) != 0)
6182 /* Cannot proceed */
6183 goto unlock;
6184 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
72a23c21 6185 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
b4c4c7b8 6186 } else if ((spares = remove_and_add_spares(mddev))) {
24dd469d
N		 6187 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6188 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
72a23c21 6189 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
24dd469d
N		 6190 } else if (mddev->recovery_cp < MaxSector) {
6191 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
72a23c21 6192 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
24dd469d
N		 6193 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6194 /* nothing to be done ... */
1da177e4 6195 goto unlock;
24dd469d 6196
1da177e4 6197 if (mddev->pers->sync_request) {
a654b9d8
N		 6198 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
6199 /* We are adding a device or devices to an array
6200 * which has the bitmap stored on all devices.
6201 * So make sure all bitmap pages get written
6202 */
6203 bitmap_write_all(mddev->bitmap);
6204 }
1da177e4
LT		 6205 mddev->sync_thread = md_register_thread(md_do_sync,
6206 mddev,
6207 "%s_resync");
6208 if (!mddev->sync_thread) {
6209 printk(KERN_ERR "%s: could not start resync"
6210 " thread...\n",
6211 mdname(mddev));
6212 /* leave the spares where they are, it shouldn't hurt */
6213 mddev->recovery = 0;
d7603b7e 6214 } else
1da177e4 6215 md_wakeup_thread(mddev->sync_thread);
72a23c21 6216 sysfs_notify(&mddev->kobj, NULL, "sync_action");
d7603b7e 6217 md_new_event(mddev);
1da177e4
LT		 6218 }
6219 unlock:
72a23c21
NB		 6220 if (!mddev->sync_thread) {
6221 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6222 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
6223 &mddev->recovery))
6224 sysfs_notify(&mddev->kobj, NULL, "sync_action");
6225 }
1da177e4
LT		 6226 mddev_unlock(mddev);
6227 }
6228}
6229
6bfe0b49
DW		 6230void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
6231{
6232 sysfs_notify(&rdev->kobj, NULL, "state");
6233 wait_event_timeout(rdev->blocked_wait,
6234 !test_bit(Blocked, &rdev->flags),
6235 msecs_to_jiffies(5000));
6236 rdev_dec_pending(rdev, mddev);
6237}
6238EXPORT_SYMBOL(md_wait_for_blocked_rdev);
6239
75c96f85
AB		 6240static int md_notify_reboot(struct notifier_block *this,
6241 unsigned long code, void *x)
1da177e4
LT		 6242{
6243 struct list_head *tmp;
6244 mddev_t *mddev;
6245
6246 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
6247
6248 printk(KERN_INFO "md: stopping all md devices.\n");
6249
29ac4aa3 6250 for_each_mddev(mddev, tmp)
c71d4887 6251 if (mddev_trylock(mddev)) {
1da177e4 6252 do_md_stop (mddev, 1);
c71d4887
NB		 6253 mddev_unlock(mddev);
6254 }
1da177e4
LT		 6255 /*
6256 * certain more exotic SCSI devices are known to be
6257 * volatile wrt too early system reboots. While the
6258 * right place to handle this issue is the given
6259 * driver, we do want to have a safe RAID driver ...
6260 */
6261 mdelay(1000*1);
6262 }
6263 return NOTIFY_DONE;
6264}
6265
75c96f85 6266static struct notifier_block md_notifier = {
1da177e4
LT		 6267 .notifier_call = md_notify_reboot,
6268 .next = NULL,
6269 .priority = INT_MAX, /* before any real devices */
6270};
6271
6272static void md_geninit(void)
6273{
1da177e4
LT		 6274 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
6275
c7705f34 6276 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
1da177e4
LT		 6277}
6278
75c96f85 6279static int __init md_init(void)
1da177e4 6280{
1da177e4
LT		 6281 if (register_blkdev(MAJOR_NR, "md"))
6282 return -1;
6283 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
6284 unregister_blkdev(MAJOR_NR, "md");
6285 return -1;
6286 }
e8703fe1
N		 6287 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
6288 md_probe, NULL, NULL);
6289 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
1da177e4
LT		 6290 md_probe, NULL, NULL);
6291
1da177e4 6292 register_reboot_notifier(&md_notifier);
0b4d4147 6293 raid_table_header = register_sysctl_table(raid_root_table);
1da177e4
LT		 6294
6295 md_geninit();
6296 return (0);
6297}
6298
6299
6300#ifndef MODULE
6301
6302/*
6303 * Searches all registered partitions for autorun RAID arrays
6304 * at boot time.
6305 */
4d936ec1
ME		 6306
6307static LIST_HEAD(all_detected_devices);
6308struct detected_devices_node {
6309 struct list_head list;
6310 dev_t dev;
6311};
1da177e4
LT		 6312
6313void md_autodetect_dev(dev_t dev)
6314{
4d936ec1
ME		 6315 struct detected_devices_node *node_detected_dev;
6316
6317 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
6318 if (node_detected_dev) {
6319 node_detected_dev->dev = dev;
6320 list_add_tail(&node_detected_dev->list, &all_detected_devices);
6321 } else {
6322 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
6323 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
6324 }
1da177e4
LT		 6325}
6326
6327
6328static void autostart_arrays(int part)
6329{
6330 mdk_rdev_t *rdev;
4d936ec1
ME		 6331 struct detected_devices_node *node_detected_dev;
6332 dev_t dev;
6333 int i_scanned, i_passed;
1da177e4 6334
4d936ec1
ME		 6335 i_scanned = 0;
6336 i_passed = 0;
1da177e4 6337
4d936ec1 6338 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
1da177e4 6339
4d936ec1
ME		 6340 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6341 i_scanned++;
6342 node_detected_dev = list_entry(all_detected_devices.next,
6343 struct detected_devices_node, list);
6344 list_del(&node_detected_dev->list);
6345 dev = node_detected_dev->dev;
6346 kfree(node_detected_dev);
df968c4e 6347 rdev = md_import_device(dev,0, 90);
1da177e4
LT		 6348 if (IS_ERR(rdev))
6349 continue;
6350
b2d444d7 6351 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 6352 MD_BUG();
6353 continue;
6354 }
d0fae18f 6355 set_bit(AutoDetected, &rdev->flags);
1da177e4 6356 list_add(&rdev->same_set, &pending_raid_disks);
4d936ec1 6357 i_passed++;
1da177e4 6358 }
4d936ec1
ME		 6359
6360 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6361 i_scanned, i_passed);
1da177e4
LT		 6362
6363 autorun_devices(part);
6364}
6365
fdee8ae4 6366#endif /* !MODULE */
1da177e4
LT		 6367
6368static __exit void md_exit(void)
6369{
6370 mddev_t *mddev;
6371 struct list_head *tmp;
8ab5e4c1 6372
e8703fe1
N		 6373 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
6374 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
1da177e4
LT		 6375
6376 unregister_blkdev(MAJOR_NR,"md");
6377 unregister_blkdev(mdp_major, "mdp");
6378 unregister_reboot_notifier(&md_notifier);
6379 unregister_sysctl_table(raid_table_header);
6380 remove_proc_entry("mdstat", NULL);
29ac4aa3 6381 for_each_mddev(mddev, tmp) {
1da177e4
LT		 6382 struct gendisk *disk = mddev->gendisk;
6383 if (!disk)
6384 continue;
6385 export_array(mddev);
6386 del_gendisk(disk);
6387 put_disk(disk);
6388 mddev->gendisk = NULL;
6389 mddev_put(mddev);
6390 }
6391}
6392
685784aa 6393subsys_initcall(md_init);
1da177e4
LT		 6394module_exit(md_exit)
6395
f91de92e
N		 6396static int get_ro(char *buffer, struct kernel_param *kp)
6397{
6398 return sprintf(buffer, "%d", start_readonly);
6399}
6400static int set_ro(const char *val, struct kernel_param *kp)
6401{
6402 char *e;
6403 int num = simple_strtoul(val, &e, 10);
6404 if (*val && (*e == '\0' || *e == '\n')) {
6405 start_readonly = num;
4dbcdc75 6406 return 0;
f91de92e
N		 6407 }
6408 return -EINVAL;
6409}
6410
80ca3a44
N		 6411module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6412module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6ff8d8ec 6413
f91de92e 6414
1da177e4
LT		 6415EXPORT_SYMBOL(register_md_personality);
6416EXPORT_SYMBOL(unregister_md_personality);
6417EXPORT_SYMBOL(md_error);
6418EXPORT_SYMBOL(md_done_sync);
6419EXPORT_SYMBOL(md_write_start);
6420EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 6421EXPORT_SYMBOL(md_register_thread);
6422EXPORT_SYMBOL(md_unregister_thread);
6423EXPORT_SYMBOL(md_wakeup_thread);
1da177e4
LT		 6424EXPORT_SYMBOL(md_check_recovery);
6425MODULE_LICENSE("GPL");
aa1595e9 6426MODULE_ALIAS("md");
72008652 6427MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
kernel source for telekom puls (alcatel/mediatek)