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md: make sure a reshape is started when device switches to read-write
[mirror_ubuntu-jammy-kernel.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
77#define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
78
1da177e4
LT		 79/*
80 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
81 * is 1000 KB/sec, so the extra system load does not show up that much.
82 * Increase it if you want to have more _guaranteed_ speed. Note that
338cec32 83 * the RAID driver will use the maximum available bandwidth if the IO
1da177e4
LT		 84 * subsystem is idle. There is also an 'absolute maximum' reconstruction
85 * speed limit - in case reconstruction slows down your system despite
86 * idle IO detection.
87 *
88 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
88202a0c 89 * or /sys/block/mdX/md/sync_speed_{min,max}
1da177e4
LT		 90 */
91
92static int sysctl_speed_limit_min = 1000;
93static int sysctl_speed_limit_max = 200000;
88202a0c
N		 94static inline int speed_min(mddev_t *mddev)
95{
96 return mddev->sync_speed_min ?
97 mddev->sync_speed_min : sysctl_speed_limit_min;
98}
99
100static inline int speed_max(mddev_t *mddev)
101{
102 return mddev->sync_speed_max ?
103 mddev->sync_speed_max : sysctl_speed_limit_max;
104}
1da177e4
LT		 105
106static struct ctl_table_header *raid_table_header;
107
108static ctl_table raid_table[] = {
109 {
110 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
111 .procname = "speed_limit_min",
112 .data = &sysctl_speed_limit_min,
113 .maxlen = sizeof(int),
80ca3a44 114 .mode = S_IRUGO|S_IWUSR,
1da177e4
LT		 115 .proc_handler = &proc_dointvec,
116 },
117 {
118 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
119 .procname = "speed_limit_max",
120 .data = &sysctl_speed_limit_max,
121 .maxlen = sizeof(int),
80ca3a44 122 .mode = S_IRUGO|S_IWUSR,
1da177e4
LT		 123 .proc_handler = &proc_dointvec,
124 },
125 { .ctl_name = 0 }
126};
127
128static ctl_table raid_dir_table[] = {
129 {
130 .ctl_name = DEV_RAID,
131 .procname = "raid",
132 .maxlen = 0,
80ca3a44 133 .mode = S_IRUGO|S_IXUGO,
1da177e4
LT		 134 .child = raid_table,
135 },
136 { .ctl_name = 0 }
137};
138
139static ctl_table raid_root_table[] = {
140 {
141 .ctl_name = CTL_DEV,
142 .procname = "dev",
143 .maxlen = 0,
144 .mode = 0555,
145 .child = raid_dir_table,
146 },
147 { .ctl_name = 0 }
148};
149
150static struct block_device_operations md_fops;
151
f91de92e
N		 152static int start_readonly;
153
d7603b7e
N		 154/*
155 * We have a system wide 'event count' that is incremented
156 * on any 'interesting' event, and readers of /proc/mdstat
157 * can use 'poll' or 'select' to find out when the event
158 * count increases.
159 *
160 * Events are:
161 * start array, stop array, error, add device, remove device,
162 * start build, activate spare
163 */
2989ddbd 164static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
d7603b7e 165static atomic_t md_event_count;
29269553 166void md_new_event(mddev_t *mddev)
d7603b7e
N		 167{
168 atomic_inc(&md_event_count);
169 wake_up(&md_event_waiters);
4508a7a7 170 sysfs_notify(&mddev->kobj, NULL, "sync_action");
d7603b7e 171}
29269553 172EXPORT_SYMBOL_GPL(md_new_event);
d7603b7e 173
c331eb04
N		 174/* Alternate version that can be called from interrupts
175 * when calling sysfs_notify isn't needed.
176 */
05381954 177static void md_new_event_inintr(mddev_t *mddev)
c331eb04
N		 178{
179 atomic_inc(&md_event_count);
180 wake_up(&md_event_waiters);
181}
182
1da177e4
LT		 183/*
184 * Enables to iterate over all existing md arrays
185 * all_mddevs_lock protects this list.
186 */
187static LIST_HEAD(all_mddevs);
188static DEFINE_SPINLOCK(all_mddevs_lock);
189
190
191/*
192 * iterates through all used mddevs in the system.
193 * We take care to grab the all_mddevs_lock whenever navigating
194 * the list, and to always hold a refcount when unlocked.
195 * Any code which breaks out of this loop while own
196 * a reference to the current mddev and must mddev_put it.
197 */
29ac4aa3 198#define for_each_mddev(mddev,tmp) \
1da177e4
LT		 199 \
200 for (({ spin_lock(&all_mddevs_lock); \
201 tmp = all_mddevs.next; \
202 mddev = NULL;}); \
203 ({ if (tmp != &all_mddevs) \
204 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
205 spin_unlock(&all_mddevs_lock); \
206 if (mddev) mddev_put(mddev); \
207 mddev = list_entry(tmp, mddev_t, all_mddevs); \
208 tmp != &all_mddevs;}); \
209 ({ spin_lock(&all_mddevs_lock); \
210 tmp = tmp->next;}) \
211 )
212
213
165125e1 214static int md_fail_request (struct request_queue *q, struct bio *bio)
1da177e4 215{
6712ecf8 216 bio_io_error(bio);
1da177e4
LT		 217 return 0;
218}
219
220static inline mddev_t *mddev_get(mddev_t *mddev)
221{
222 atomic_inc(&mddev->active);
223 return mddev;
224}
225
226static void mddev_put(mddev_t *mddev)
227{
228 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
229 return;
230 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
231 list_del(&mddev->all_mddevs);
926ce2d8 232 spin_unlock(&all_mddevs_lock);
1312f40e 233 blk_cleanup_queue(mddev->queue);
c10997f6 234 kobject_put(&mddev->kobj);
926ce2d8
N		 235 } else
236 spin_unlock(&all_mddevs_lock);
1da177e4
LT		 237}
238
239static mddev_t * mddev_find(dev_t unit)
240{
241 mddev_t *mddev, *new = NULL;
242
243 retry:
244 spin_lock(&all_mddevs_lock);
245 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
246 if (mddev->unit == unit) {
247 mddev_get(mddev);
248 spin_unlock(&all_mddevs_lock);
990a8baf 249 kfree(new);
1da177e4
LT		 250 return mddev;
251 }
252
253 if (new) {
254 list_add(&new->all_mddevs, &all_mddevs);
255 spin_unlock(&all_mddevs_lock);
256 return new;
257 }
258 spin_unlock(&all_mddevs_lock);
259
9ffae0cf 260 new = kzalloc(sizeof(*new), GFP_KERNEL);
1da177e4
LT		 261 if (!new)
262 return NULL;
263
1da177e4
LT		 264 new->unit = unit;
265 if (MAJOR(unit) == MD_MAJOR)
266 new->md_minor = MINOR(unit);
267 else
268 new->md_minor = MINOR(unit) >> MdpMinorShift;
269
df5b89b3 270 mutex_init(&new->reconfig_mutex);
1da177e4
LT		 271 INIT_LIST_HEAD(&new->disks);
272 INIT_LIST_HEAD(&new->all_mddevs);
273 init_timer(&new->safemode_timer);
274 atomic_set(&new->active, 1);
06d91a5f 275 spin_lock_init(&new->write_lock);
3d310eb7 276 init_waitqueue_head(&new->sb_wait);
08a02ecd 277 new->reshape_position = MaxSector;
c6207277 278 new->resync_max = MaxSector;
1da177e4
LT		 279
280 new->queue = blk_alloc_queue(GFP_KERNEL);
281 if (!new->queue) {
282 kfree(new);
283 return NULL;
284 }
89e5c8b5 285 set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags);
1da177e4
LT		 286
287 blk_queue_make_request(new->queue, md_fail_request);
288
289 goto retry;
290}
291
292static inline int mddev_lock(mddev_t * mddev)
293{
df5b89b3 294 return mutex_lock_interruptible(&mddev->reconfig_mutex);
1da177e4
LT		 295}
296
1da177e4
LT		 297static inline int mddev_trylock(mddev_t * mddev)
298{
df5b89b3 299 return mutex_trylock(&mddev->reconfig_mutex);
1da177e4
LT		 300}
301
302static inline void mddev_unlock(mddev_t * mddev)
303{
df5b89b3 304 mutex_unlock(&mddev->reconfig_mutex);
1da177e4 305
005eca5e 306 md_wakeup_thread(mddev->thread);
1da177e4
LT		 307}
308
2989ddbd 309static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
1da177e4
LT		 310{
311 mdk_rdev_t * rdev;
312 struct list_head *tmp;
313
d089c6af 314 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 315 if (rdev->desc_nr == nr)
316 return rdev;
317 }
318 return NULL;
319}
320
321static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
322{
323 struct list_head *tmp;
324 mdk_rdev_t *rdev;
325
d089c6af 326 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 327 if (rdev->bdev->bd_dev == dev)
328 return rdev;
329 }
330 return NULL;
331}
332
d9d166c2 333static struct mdk_personality *find_pers(int level, char *clevel)
2604b703
N		 334{
335 struct mdk_personality *pers;
d9d166c2
N		 336 list_for_each_entry(pers, &pers_list, list) {
337 if (level != LEVEL_NONE && pers->level == level)
2604b703 338 return pers;
d9d166c2
N		 339 if (strcmp(pers->name, clevel)==0)
340 return pers;
341 }
2604b703
N		 342 return NULL;
343}
344
77933d72 345static inline sector_t calc_dev_sboffset(struct block_device *bdev)
1da177e4
LT		 346{
347 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
348 return MD_NEW_SIZE_BLOCKS(size);
349}
350
351static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
352{
353 sector_t size;
354
355 size = rdev->sb_offset;
356
357 if (chunk_size)
358 size &= ~((sector_t)chunk_size/1024 - 1);
359 return size;
360}
361
362static int alloc_disk_sb(mdk_rdev_t * rdev)
363{
364 if (rdev->sb_page)
365 MD_BUG();
366
367 rdev->sb_page = alloc_page(GFP_KERNEL);
368 if (!rdev->sb_page) {
369 printk(KERN_ALERT "md: out of memory.\n");
370 return -EINVAL;
371 }
372
373 return 0;
374}
375
376static void free_disk_sb(mdk_rdev_t * rdev)
377{
378 if (rdev->sb_page) {
2d1f3b5d 379 put_page(rdev->sb_page);
1da177e4
LT		 380 rdev->sb_loaded = 0;
381 rdev->sb_page = NULL;
382 rdev->sb_offset = 0;
383 rdev->size = 0;
384 }
385}
386
387
6712ecf8 388static void super_written(struct bio *bio, int error)
7bfa19f2
N		 389{
390 mdk_rdev_t *rdev = bio->bi_private;
a9701a30 391 mddev_t *mddev = rdev->mddev;
7bfa19f2 392
3a0f5bbb
N		 393 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
394 printk("md: super_written gets error=%d, uptodate=%d\n",
395 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
396 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
a9701a30 397 md_error(mddev, rdev);
3a0f5bbb 398 }
7bfa19f2 399
a9701a30
N		 400 if (atomic_dec_and_test(&mddev->pending_writes))
401 wake_up(&mddev->sb_wait);
f8b58edf 402 bio_put(bio);
7bfa19f2
N		 403}
404
6712ecf8 405static void super_written_barrier(struct bio *bio, int error)
a9701a30
N		 406{
407 struct bio *bio2 = bio->bi_private;
408 mdk_rdev_t *rdev = bio2->bi_private;
409 mddev_t *mddev = rdev->mddev;
a9701a30
N		 410
411 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
412 error == -EOPNOTSUPP) {
413 unsigned long flags;
414 /* barriers don't appear to be supported :-( */
415 set_bit(BarriersNotsupp, &rdev->flags);
416 mddev->barriers_work = 0;
417 spin_lock_irqsave(&mddev->write_lock, flags);
418 bio2->bi_next = mddev->biolist;
419 mddev->biolist = bio2;
420 spin_unlock_irqrestore(&mddev->write_lock, flags);
421 wake_up(&mddev->sb_wait);
422 bio_put(bio);
6712ecf8
N		 423 } else {
424 bio_put(bio2);
425 bio->bi_private = rdev;
426 super_written(bio, error);
a9701a30 427 }
a9701a30
N		 428}
429
7bfa19f2
N		 430void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
431 sector_t sector, int size, struct page *page)
432{
433 /* write first size bytes of page to sector of rdev
434 * Increment mddev->pending_writes before returning
435 * and decrement it on completion, waking up sb_wait
436 * if zero is reached.
437 * If an error occurred, call md_error
a9701a30
N		 438 *
439 * As we might need to resubmit the request if BIO_RW_BARRIER
440 * causes ENOTSUPP, we allocate a spare bio...
7bfa19f2
N		 441 */
442 struct bio *bio = bio_alloc(GFP_NOIO, 1);
a9701a30 443 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
7bfa19f2
N		 444
445 bio->bi_bdev = rdev->bdev;
446 bio->bi_sector = sector;
447 bio_add_page(bio, page, size, 0);
448 bio->bi_private = rdev;
449 bio->bi_end_io = super_written;
a9701a30
N		 450 bio->bi_rw = rw;
451
7bfa19f2 452 atomic_inc(&mddev->pending_writes);
a9701a30
N		 453 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
454 struct bio *rbio;
455 rw |= (1<<BIO_RW_BARRIER);
456 rbio = bio_clone(bio, GFP_NOIO);
457 rbio->bi_private = bio;
458 rbio->bi_end_io = super_written_barrier;
459 submit_bio(rw, rbio);
460 } else
461 submit_bio(rw, bio);
462}
463
464void md_super_wait(mddev_t *mddev)
465{
466 /* wait for all superblock writes that were scheduled to complete.
467 * if any had to be retried (due to BARRIER problems), retry them
468 */
469 DEFINE_WAIT(wq);
470 for(;;) {
471 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
472 if (atomic_read(&mddev->pending_writes)==0)
473 break;
474 while (mddev->biolist) {
475 struct bio *bio;
476 spin_lock_irq(&mddev->write_lock);
477 bio = mddev->biolist;
478 mddev->biolist = bio->bi_next ;
479 bio->bi_next = NULL;
480 spin_unlock_irq(&mddev->write_lock);
481 submit_bio(bio->bi_rw, bio);
482 }
483 schedule();
484 }
485 finish_wait(&mddev->sb_wait, &wq);
7bfa19f2
N		 486}
487
6712ecf8 488static void bi_complete(struct bio *bio, int error)
1da177e4 489{
1da177e4 490 complete((struct completion*)bio->bi_private);
1da177e4
LT		 491}
492
a654b9d8 493int sync_page_io(struct block_device *bdev, sector_t sector, int size,
1da177e4
LT		 494 struct page *page, int rw)
495{
baaa2c51 496 struct bio *bio = bio_alloc(GFP_NOIO, 1);
1da177e4
LT		 497 struct completion event;
498 int ret;
499
500 rw |= (1 << BIO_RW_SYNC);
501
502 bio->bi_bdev = bdev;
503 bio->bi_sector = sector;
504 bio_add_page(bio, page, size, 0);
505 init_completion(&event);
506 bio->bi_private = &event;
507 bio->bi_end_io = bi_complete;
508 submit_bio(rw, bio);
509 wait_for_completion(&event);
510
511 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
512 bio_put(bio);
513 return ret;
514}
a8745db2 515EXPORT_SYMBOL_GPL(sync_page_io);
1da177e4 516
0002b271 517static int read_disk_sb(mdk_rdev_t * rdev, int size)
1da177e4
LT		 518{
519 char b[BDEVNAME_SIZE];
520 if (!rdev->sb_page) {
521 MD_BUG();
522 return -EINVAL;
523 }
524 if (rdev->sb_loaded)
525 return 0;
526
527
0002b271 528 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
1da177e4
LT		 529 goto fail;
530 rdev->sb_loaded = 1;
531 return 0;
532
533fail:
534 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
535 bdevname(rdev->bdev,b));
536 return -EINVAL;
537}
538
539static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
540{
541 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
542 (sb1->set_uuid1 == sb2->set_uuid1) &&
543 (sb1->set_uuid2 == sb2->set_uuid2) &&
544 (sb1->set_uuid3 == sb2->set_uuid3))
545
546 return 1;
547
548 return 0;
549}
550
551
552static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
553{
554 int ret;
555 mdp_super_t *tmp1, *tmp2;
556
557 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
558 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
559
560 if (!tmp1 || !tmp2) {
561 ret = 0;
562 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
563 goto abort;
564 }
565
566 *tmp1 = *sb1;
567 *tmp2 = *sb2;
568
569 /*
570 * nr_disks is not constant
571 */
572 tmp1->nr_disks = 0;
573 tmp2->nr_disks = 0;
574
575 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
576 ret = 0;
577 else
578 ret = 1;
579
580abort:
990a8baf
JJ		 581 kfree(tmp1);
582 kfree(tmp2);
1da177e4
LT		 583 return ret;
584}
585
4d167f09
N		 586
587static u32 md_csum_fold(u32 csum)
588{
589 csum = (csum & 0xffff) + (csum >> 16);
590 return (csum & 0xffff) + (csum >> 16);
591}
592
1da177e4
LT		 593static unsigned int calc_sb_csum(mdp_super_t * sb)
594{
4d167f09
N		 595 u64 newcsum = 0;
596 u32 *sb32 = (u32*)sb;
597 int i;
1da177e4
LT		 598 unsigned int disk_csum, csum;
599
600 disk_csum = sb->sb_csum;
601 sb->sb_csum = 0;
4d167f09
N		 602
603 for (i = 0; i < MD_SB_BYTES/4 ; i++)
604 newcsum += sb32[i];
605 csum = (newcsum & 0xffffffff) + (newcsum>>32);
606
607
608#ifdef CONFIG_ALPHA
609 /* This used to use csum_partial, which was wrong for several
610 * reasons including that different results are returned on
611 * different architectures. It isn't critical that we get exactly
612 * the same return value as before (we always csum_fold before
613 * testing, and that removes any differences). However as we
614 * know that csum_partial always returned a 16bit value on
615 * alphas, do a fold to maximise conformity to previous behaviour.
616 */
617 sb->sb_csum = md_csum_fold(disk_csum);
618#else
1da177e4 619 sb->sb_csum = disk_csum;
4d167f09 620#endif
1da177e4
LT		 621 return csum;
622}
623
624
625/*
626 * Handle superblock details.
627 * We want to be able to handle multiple superblock formats
628 * so we have a common interface to them all, and an array of
629 * different handlers.
630 * We rely on user-space to write the initial superblock, and support
631 * reading and updating of superblocks.
632 * Interface methods are:
633 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
634 * loads and validates a superblock on dev.
635 * if refdev != NULL, compare superblocks on both devices
636 * Return:
637 * 0 - dev has a superblock that is compatible with refdev
638 * 1 - dev has a superblock that is compatible and newer than refdev
639 * so dev should be used as the refdev in future
640 * -EINVAL superblock incompatible or invalid
641 * -othererror e.g. -EIO
642 *
643 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
644 * Verify that dev is acceptable into mddev.
645 * The first time, mddev->raid_disks will be 0, and data from
646 * dev should be merged in. Subsequent calls check that dev
647 * is new enough. Return 0 or -EINVAL
648 *
649 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
650 * Update the superblock for rdev with data in mddev
651 * This does not write to disc.
652 *
653 */
654
655struct super_type {
656 char *name;
657 struct module *owner;
658 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
659 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
660 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
661};
662
663/*
664 * load_super for 0.90.0
665 */
666static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
667{
668 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
669 mdp_super_t *sb;
670 int ret;
671 sector_t sb_offset;
672
673 /*
674 * Calculate the position of the superblock,
675 * it's at the end of the disk.
676 *
677 * It also happens to be a multiple of 4Kb.
678 */
679 sb_offset = calc_dev_sboffset(rdev->bdev);
680 rdev->sb_offset = sb_offset;
681
0002b271 682 ret = read_disk_sb(rdev, MD_SB_BYTES);
1da177e4
LT		 683 if (ret) return ret;
684
685 ret = -EINVAL;
686
687 bdevname(rdev->bdev, b);
688 sb = (mdp_super_t*)page_address(rdev->sb_page);
689
690 if (sb->md_magic != MD_SB_MAGIC) {
691 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
692 b);
693 goto abort;
694 }
695
696 if (sb->major_version != 0 ||
f6705578
N		 697 sb->minor_version < 90 ||
698 sb->minor_version > 91) {
1da177e4
LT		 699 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
700 sb->major_version, sb->minor_version,
701 b);
702 goto abort;
703 }
704
705 if (sb->raid_disks <= 0)
706 goto abort;
707
4d167f09 708 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1da177e4
LT		 709 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
710 b);
711 goto abort;
712 }
713
714 rdev->preferred_minor = sb->md_minor;
715 rdev->data_offset = 0;
0002b271 716 rdev->sb_size = MD_SB_BYTES;
1da177e4 717
e11e93fa
N		 718 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
719 if (sb->level != 1 && sb->level != 4
720 && sb->level != 5 && sb->level != 6
721 && sb->level != 10) {
722 /* FIXME use a better test */
723 printk(KERN_WARNING
724 "md: bitmaps not supported for this level.\n");
725 goto abort;
726 }
727 }
728
1da177e4
LT		 729 if (sb->level == LEVEL_MULTIPATH)
730 rdev->desc_nr = -1;
731 else
732 rdev->desc_nr = sb->this_disk.number;
733
734 if (refdev == 0)
735 ret = 1;
736 else {
737 __u64 ev1, ev2;
738 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
739 if (!uuid_equal(refsb, sb)) {
740 printk(KERN_WARNING "md: %s has different UUID to %s\n",
741 b, bdevname(refdev->bdev,b2));
742 goto abort;
743 }
744 if (!sb_equal(refsb, sb)) {
745 printk(KERN_WARNING "md: %s has same UUID"
746 " but different superblock to %s\n",
747 b, bdevname(refdev->bdev, b2));
748 goto abort;
749 }
750 ev1 = md_event(sb);
751 ev2 = md_event(refsb);
752 if (ev1 > ev2)
753 ret = 1;
754 else
755 ret = 0;
756 }
757 rdev->size = calc_dev_size(rdev, sb->chunk_size);
758
2bf071bf
N		 759 if (rdev->size < sb->size && sb->level > 1)
760 /* "this cannot possibly happen" ... */
761 ret = -EINVAL;
762
1da177e4
LT		 763 abort:
764 return ret;
765}
766
767/*
768 * validate_super for 0.90.0
769 */
770static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
771{
772 mdp_disk_t *desc;
773 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
07d84d10 774 __u64 ev1 = md_event(sb);
1da177e4 775
41158c7e 776 rdev->raid_disk = -1;
c5d79adb
N		 777 clear_bit(Faulty, &rdev->flags);
778 clear_bit(In_sync, &rdev->flags);
779 clear_bit(WriteMostly, &rdev->flags);
780 clear_bit(BarriersNotsupp, &rdev->flags);
781
1da177e4
LT		 782 if (mddev->raid_disks == 0) {
783 mddev->major_version = 0;
784 mddev->minor_version = sb->minor_version;
785 mddev->patch_version = sb->patch_version;
e691063a 786 mddev->external = 0;
1da177e4
LT		 787 mddev->chunk_size = sb->chunk_size;
788 mddev->ctime = sb->ctime;
789 mddev->utime = sb->utime;
790 mddev->level = sb->level;
d9d166c2 791 mddev->clevel[0] = 0;
1da177e4
LT		 792 mddev->layout = sb->layout;
793 mddev->raid_disks = sb->raid_disks;
794 mddev->size = sb->size;
07d84d10 795 mddev->events = ev1;
9223214e 796 mddev->bitmap_offset = 0;
36fa3063 797 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
1da177e4 798
f6705578
N		 799 if (mddev->minor_version >= 91) {
800 mddev->reshape_position = sb->reshape_position;
801 mddev->delta_disks = sb->delta_disks;
802 mddev->new_level = sb->new_level;
803 mddev->new_layout = sb->new_layout;
804 mddev->new_chunk = sb->new_chunk;
805 } else {
806 mddev->reshape_position = MaxSector;
807 mddev->delta_disks = 0;
808 mddev->new_level = mddev->level;
809 mddev->new_layout = mddev->layout;
810 mddev->new_chunk = mddev->chunk_size;
811 }
812
1da177e4
LT		 813 if (sb->state & (1<<MD_SB_CLEAN))
814 mddev->recovery_cp = MaxSector;
815 else {
816 if (sb->events_hi == sb->cp_events_hi &&
817 sb->events_lo == sb->cp_events_lo) {
818 mddev->recovery_cp = sb->recovery_cp;
819 } else
820 mddev->recovery_cp = 0;
821 }
822
823 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
824 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
825 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
826 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
827
828 mddev->max_disks = MD_SB_DISKS;
a654b9d8
N		 829
830 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
e11e93fa 831 mddev->bitmap_file == NULL)
36fa3063 832 mddev->bitmap_offset = mddev->default_bitmap_offset;
a654b9d8 833
41158c7e
N		 834 } else if (mddev->pers == NULL) {
835 /* Insist on good event counter while assembling */
1da177e4
LT		 836 ++ev1;
837 if (ev1 < mddev->events)
838 return -EINVAL;
41158c7e
N		 839 } else if (mddev->bitmap) {
840 /* if adding to array with a bitmap, then we can accept an
841 * older device ... but not too old.
842 */
41158c7e
N		 843 if (ev1 < mddev->bitmap->events_cleared)
844 return 0;
07d84d10
N		 845 } else {
846 if (ev1 < mddev->events)
847 /* just a hot-add of a new device, leave raid_disk at -1 */
848 return 0;
849 }
41158c7e 850
1da177e4 851 if (mddev->level != LEVEL_MULTIPATH) {
1da177e4
LT		 852 desc = sb->disks + rdev->desc_nr;
853
854 if (desc->state & (1<<MD_DISK_FAULTY))
b2d444d7 855 set_bit(Faulty, &rdev->flags);
7c7546cc
N		 856 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
857 desc->raid_disk < mddev->raid_disks */) {
b2d444d7 858 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 859 rdev->raid_disk = desc->raid_disk;
860 }
8ddf9efe
N		 861 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
862 set_bit(WriteMostly, &rdev->flags);
41158c7e 863 } else /* MULTIPATH are always insync */
b2d444d7 864 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 865 return 0;
866}
867
868/*
869 * sync_super for 0.90.0
870 */
871static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
872{
873 mdp_super_t *sb;
874 struct list_head *tmp;
875 mdk_rdev_t *rdev2;
876 int next_spare = mddev->raid_disks;
19133a42 877
1da177e4
LT		 878
879 /* make rdev->sb match mddev data..
880 *
881 * 1/ zero out disks
882 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
883 * 3/ any empty disks < next_spare become removed
884 *
885 * disks[0] gets initialised to REMOVED because
886 * we cannot be sure from other fields if it has
887 * been initialised or not.
888 */
889 int i;
890 int active=0, working=0,failed=0,spare=0,nr_disks=0;
891
61181565
N		 892 rdev->sb_size = MD_SB_BYTES;
893
1da177e4
LT		 894 sb = (mdp_super_t*)page_address(rdev->sb_page);
895
896 memset(sb, 0, sizeof(*sb));
897
898 sb->md_magic = MD_SB_MAGIC;
899 sb->major_version = mddev->major_version;
1da177e4
LT		 900 sb->patch_version = mddev->patch_version;
901 sb->gvalid_words = 0; /* ignored */
902 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
903 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
904 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
905 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
906
907 sb->ctime = mddev->ctime;
908 sb->level = mddev->level;
909 sb->size = mddev->size;
910 sb->raid_disks = mddev->raid_disks;
911 sb->md_minor = mddev->md_minor;
e691063a 912 sb->not_persistent = 0;
1da177e4
LT		 913 sb->utime = mddev->utime;
914 sb->state = 0;
915 sb->events_hi = (mddev->events>>32);
916 sb->events_lo = (u32)mddev->events;
917
f6705578
N		 918 if (mddev->reshape_position == MaxSector)
919 sb->minor_version = 90;
920 else {
921 sb->minor_version = 91;
922 sb->reshape_position = mddev->reshape_position;
923 sb->new_level = mddev->new_level;
924 sb->delta_disks = mddev->delta_disks;
925 sb->new_layout = mddev->new_layout;
926 sb->new_chunk = mddev->new_chunk;
927 }
928 mddev->minor_version = sb->minor_version;
1da177e4
LT		 929 if (mddev->in_sync)
930 {
931 sb->recovery_cp = mddev->recovery_cp;
932 sb->cp_events_hi = (mddev->events>>32);
933 sb->cp_events_lo = (u32)mddev->events;
934 if (mddev->recovery_cp == MaxSector)
935 sb->state = (1<< MD_SB_CLEAN);
936 } else
937 sb->recovery_cp = 0;
938
939 sb->layout = mddev->layout;
940 sb->chunk_size = mddev->chunk_size;
941
a654b9d8
N		 942 if (mddev->bitmap && mddev->bitmap_file == NULL)
943 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
944
1da177e4 945 sb->disks[0].state = (1<<MD_DISK_REMOVED);
d089c6af 946 rdev_for_each(rdev2, tmp, mddev) {
1da177e4 947 mdp_disk_t *d;
86e6ffdd 948 int desc_nr;
b2d444d7
N		 949 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
950 && !test_bit(Faulty, &rdev2->flags))
86e6ffdd 951 desc_nr = rdev2->raid_disk;
1da177e4 952 else
86e6ffdd 953 desc_nr = next_spare++;
19133a42 954 rdev2->desc_nr = desc_nr;
1da177e4
LT		 955 d = &sb->disks[rdev2->desc_nr];
956 nr_disks++;
957 d->number = rdev2->desc_nr;
958 d->major = MAJOR(rdev2->bdev->bd_dev);
959 d->minor = MINOR(rdev2->bdev->bd_dev);
b2d444d7
N		 960 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
961 && !test_bit(Faulty, &rdev2->flags))
1da177e4
LT		 962 d->raid_disk = rdev2->raid_disk;
963 else
964 d->raid_disk = rdev2->desc_nr; /* compatibility */
1be7892f 965 if (test_bit(Faulty, &rdev2->flags))
1da177e4 966 d->state = (1<<MD_DISK_FAULTY);
1be7892f 967 else if (test_bit(In_sync, &rdev2->flags)) {
1da177e4
LT		 968 d->state = (1<<MD_DISK_ACTIVE);
969 d->state |= (1<<MD_DISK_SYNC);
970 active++;
971 working++;
972 } else {
973 d->state = 0;
974 spare++;
975 working++;
976 }
8ddf9efe
N		 977 if (test_bit(WriteMostly, &rdev2->flags))
978 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4 979 }
1da177e4
LT		 980 /* now set the "removed" and "faulty" bits on any missing devices */
981 for (i=0 ; i < mddev->raid_disks ; i++) {
982 mdp_disk_t *d = &sb->disks[i];
983 if (d->state == 0 && d->number == 0) {
984 d->number = i;
985 d->raid_disk = i;
986 d->state = (1<<MD_DISK_REMOVED);
987 d->state |= (1<<MD_DISK_FAULTY);
988 failed++;
989 }
990 }
991 sb->nr_disks = nr_disks;
992 sb->active_disks = active;
993 sb->working_disks = working;
994 sb->failed_disks = failed;
995 sb->spare_disks = spare;
996
997 sb->this_disk = sb->disks[rdev->desc_nr];
998 sb->sb_csum = calc_sb_csum(sb);
999}
1000
1001/*
1002 * version 1 superblock
1003 */
1004
1c05b4bc 1005static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1da177e4 1006{
1c05b4bc
N		 1007 __le32 disk_csum;
1008 u32 csum;
1da177e4
LT		 1009 unsigned long long newcsum;
1010 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1c05b4bc 1011 __le32 *isuper = (__le32*)sb;
1da177e4
LT		 1012 int i;
1013
1014 disk_csum = sb->sb_csum;
1015 sb->sb_csum = 0;
1016 newcsum = 0;
1017 for (i=0; size>=4; size -= 4 )
1018 newcsum += le32_to_cpu(*isuper++);
1019
1020 if (size == 2)
1c05b4bc 1021 newcsum += le16_to_cpu(*(__le16*) isuper);
1da177e4
LT		 1022
1023 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1024 sb->sb_csum = disk_csum;
1025 return cpu_to_le32(csum);
1026}
1027
1028static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1029{
1030 struct mdp_superblock_1 *sb;
1031 int ret;
1032 sector_t sb_offset;
1033 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 1034 int bmask;
1da177e4
LT		 1035
1036 /*
1037 * Calculate the position of the superblock.
1038 * It is always aligned to a 4K boundary and
1039 * depeding on minor_version, it can be:
1040 * 0: At least 8K, but less than 12K, from end of device
1041 * 1: At start of device
1042 * 2: 4K from start of device.
1043 */
1044 switch(minor_version) {
1045 case 0:
1046 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1047 sb_offset -= 8*2;
39730960 1048 sb_offset &= ~(sector_t)(4*2-1);
1da177e4
LT		 1049 /* convert from sectors to K */
1050 sb_offset /= 2;
1051 break;
1052 case 1:
1053 sb_offset = 0;
1054 break;
1055 case 2:
1056 sb_offset = 4;
1057 break;
1058 default:
1059 return -EINVAL;
1060 }
1061 rdev->sb_offset = sb_offset;
1062
0002b271
N		 1063 /* superblock is rarely larger than 1K, but it can be larger,
1064 * and it is safe to read 4k, so we do that
1065 */
1066 ret = read_disk_sb(rdev, 4096);
1da177e4
LT		 1067 if (ret) return ret;
1068
1069
1070 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1071
1072 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1073 sb->major_version != cpu_to_le32(1) ||
1074 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1075 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
71c0805c 1076 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT		 1077 return -EINVAL;
1078
1079 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1080 printk("md: invalid superblock checksum on %s\n",
1081 bdevname(rdev->bdev,b));
1082 return -EINVAL;
1083 }
1084 if (le64_to_cpu(sb->data_size) < 10) {
1085 printk("md: data_size too small on %s\n",
1086 bdevname(rdev->bdev,b));
1087 return -EINVAL;
1088 }
e11e93fa
N		 1089 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1090 if (sb->level != cpu_to_le32(1) &&
1091 sb->level != cpu_to_le32(4) &&
1092 sb->level != cpu_to_le32(5) &&
1093 sb->level != cpu_to_le32(6) &&
1094 sb->level != cpu_to_le32(10)) {
1095 printk(KERN_WARNING
1096 "md: bitmaps not supported for this level.\n");
1097 return -EINVAL;
1098 }
1099 }
1100
1da177e4
LT		 1101 rdev->preferred_minor = 0xffff;
1102 rdev->data_offset = le64_to_cpu(sb->data_offset);
4dbcdc75 1103 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1da177e4 1104
0002b271 1105 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
720a3dc3 1106 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
0002b271 1107 if (rdev->sb_size & bmask)
a1801f85
N		 1108 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1109
1110 if (minor_version
1111 && rdev->data_offset < sb_offset + (rdev->sb_size/512))
1112 return -EINVAL;
0002b271 1113
31b65a0d
N		 1114 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1115 rdev->desc_nr = -1;
1116 else
1117 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1118
1da177e4 1119 if (refdev == 0)
8ed75463 1120 ret = 1;
1da177e4
LT		 1121 else {
1122 __u64 ev1, ev2;
1123 struct mdp_superblock_1 *refsb =
1124 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1125
1126 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1127 sb->level != refsb->level ||
1128 sb->layout != refsb->layout ||
1129 sb->chunksize != refsb->chunksize) {
1130 printk(KERN_WARNING "md: %s has strangely different"
1131 " superblock to %s\n",
1132 bdevname(rdev->bdev,b),
1133 bdevname(refdev->bdev,b2));
1134 return -EINVAL;
1135 }
1136 ev1 = le64_to_cpu(sb->events);
1137 ev2 = le64_to_cpu(refsb->events);
1138
1139 if (ev1 > ev2)
8ed75463
N		 1140 ret = 1;
1141 else
1142 ret = 0;
1da177e4 1143 }
a1801f85 1144 if (minor_version)
1da177e4
LT		 1145 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1146 else
1147 rdev->size = rdev->sb_offset;
1148 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1149 return -EINVAL;
1150 rdev->size = le64_to_cpu(sb->data_size)/2;
1151 if (le32_to_cpu(sb->chunksize))
1152 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
2bf071bf 1153
1c05b4bc 1154 if (le64_to_cpu(sb->size) > rdev->size*2)
2bf071bf 1155 return -EINVAL;
8ed75463 1156 return ret;
1da177e4
LT		 1157}
1158
1159static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1160{
1161 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
07d84d10 1162 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4 1163
41158c7e 1164 rdev->raid_disk = -1;
c5d79adb
N		 1165 clear_bit(Faulty, &rdev->flags);
1166 clear_bit(In_sync, &rdev->flags);
1167 clear_bit(WriteMostly, &rdev->flags);
1168 clear_bit(BarriersNotsupp, &rdev->flags);
1169
1da177e4
LT		 1170 if (mddev->raid_disks == 0) {
1171 mddev->major_version = 1;
1172 mddev->patch_version = 0;
e691063a 1173 mddev->external = 0;
1da177e4
LT		 1174 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1175 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1176 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1177 mddev->level = le32_to_cpu(sb->level);
d9d166c2 1178 mddev->clevel[0] = 0;
1da177e4
LT		 1179 mddev->layout = le32_to_cpu(sb->layout);
1180 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1181 mddev->size = le64_to_cpu(sb->size)/2;
07d84d10 1182 mddev->events = ev1;
9223214e 1183 mddev->bitmap_offset = 0;
29fc7e3e 1184 mddev->default_bitmap_offset = 1024 >> 9;
1da177e4
LT		 1185
1186 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1187 memcpy(mddev->uuid, sb->set_uuid, 16);
1188
1189 mddev->max_disks = (4096-256)/2;
a654b9d8 1190
71c0805c 1191 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
e11e93fa 1192 mddev->bitmap_file == NULL )
a654b9d8 1193 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
e11e93fa 1194
f6705578
N		 1195 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1196 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1197 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1198 mddev->new_level = le32_to_cpu(sb->new_level);
1199 mddev->new_layout = le32_to_cpu(sb->new_layout);
1200 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1201 } else {
1202 mddev->reshape_position = MaxSector;
1203 mddev->delta_disks = 0;
1204 mddev->new_level = mddev->level;
1205 mddev->new_layout = mddev->layout;
1206 mddev->new_chunk = mddev->chunk_size;
1207 }
1208
41158c7e
N		 1209 } else if (mddev->pers == NULL) {
1210 /* Insist of good event counter while assembling */
1da177e4
LT		 1211 ++ev1;
1212 if (ev1 < mddev->events)
1213 return -EINVAL;
41158c7e
N		 1214 } else if (mddev->bitmap) {
1215 /* If adding to array with a bitmap, then we can accept an
1216 * older device, but not too old.
1217 */
41158c7e
N		 1218 if (ev1 < mddev->bitmap->events_cleared)
1219 return 0;
07d84d10
N		 1220 } else {
1221 if (ev1 < mddev->events)
1222 /* just a hot-add of a new device, leave raid_disk at -1 */
1223 return 0;
1224 }
1da177e4
LT		 1225 if (mddev->level != LEVEL_MULTIPATH) {
1226 int role;
1da177e4
LT		 1227 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1228 switch(role) {
1229 case 0xffff: /* spare */
1da177e4
LT		 1230 break;
1231 case 0xfffe: /* faulty */
b2d444d7 1232 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 1233 break;
1234 default:
5fd6c1dc
N		 1235 if ((le32_to_cpu(sb->feature_map) &
1236 MD_FEATURE_RECOVERY_OFFSET))
1237 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1238 else
1239 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1240 rdev->raid_disk = role;
1241 break;
1242 }
8ddf9efe
N		 1243 if (sb->devflags & WriteMostly1)
1244 set_bit(WriteMostly, &rdev->flags);
41158c7e 1245 } else /* MULTIPATH are always insync */
b2d444d7 1246 set_bit(In_sync, &rdev->flags);
41158c7e 1247
1da177e4
LT		 1248 return 0;
1249}
1250
1251static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1252{
1253 struct mdp_superblock_1 *sb;
1254 struct list_head *tmp;
1255 mdk_rdev_t *rdev2;
1256 int max_dev, i;
1257 /* make rdev->sb match mddev and rdev data. */
1258
1259 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1260
1261 sb->feature_map = 0;
1262 sb->pad0 = 0;
5fd6c1dc 1263 sb->recovery_offset = cpu_to_le64(0);
1da177e4
LT		 1264 memset(sb->pad1, 0, sizeof(sb->pad1));
1265 memset(sb->pad2, 0, sizeof(sb->pad2));
1266 memset(sb->pad3, 0, sizeof(sb->pad3));
1267
1268 sb->utime = cpu_to_le64((__u64)mddev->utime);
1269 sb->events = cpu_to_le64(mddev->events);
1270 if (mddev->in_sync)
1271 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1272 else
1273 sb->resync_offset = cpu_to_le64(0);
1274
1c05b4bc 1275 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
4dbcdc75 1276
f0ca340c 1277 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
29fc7e3e 1278 sb->size = cpu_to_le64(mddev->size<<1);
f0ca340c 1279
a654b9d8
N		 1280 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1281 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
71c0805c 1282 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8 1283 }
5fd6c1dc
N		 1284
1285 if (rdev->raid_disk >= 0 &&
1286 !test_bit(In_sync, &rdev->flags) &&
1287 rdev->recovery_offset > 0) {
1288 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1289 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1290 }
1291
f6705578
N		 1292 if (mddev->reshape_position != MaxSector) {
1293 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1294 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1295 sb->new_layout = cpu_to_le32(mddev->new_layout);
1296 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1297 sb->new_level = cpu_to_le32(mddev->new_level);
1298 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1299 }
a654b9d8 1300
1da177e4 1301 max_dev = 0;
d089c6af 1302 rdev_for_each(rdev2, tmp, mddev)
1da177e4
LT		 1303 if (rdev2->desc_nr+1 > max_dev)
1304 max_dev = rdev2->desc_nr+1;
a778b73f
N		 1305
1306 if (max_dev > le32_to_cpu(sb->max_dev))
1307 sb->max_dev = cpu_to_le32(max_dev);
1da177e4
LT		 1308 for (i=0; i<max_dev;i++)
1309 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1310
d089c6af 1311 rdev_for_each(rdev2, tmp, mddev) {
1da177e4 1312 i = rdev2->desc_nr;
b2d444d7 1313 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1314 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1315 else if (test_bit(In_sync, &rdev2->flags))
1da177e4 1316 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
5fd6c1dc
N		 1317 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1318 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1da177e4
LT		 1319 else
1320 sb->dev_roles[i] = cpu_to_le16(0xffff);
1321 }
1322
1da177e4
LT		 1323 sb->sb_csum = calc_sb_1_csum(sb);
1324}
1325
1326
75c96f85 1327static struct super_type super_types[] = {
1da177e4
LT		 1328 [0] = {
1329 .name = "0.90.0",
1330 .owner = THIS_MODULE,
1331 .load_super = super_90_load,
1332 .validate_super = super_90_validate,
1333 .sync_super = super_90_sync,
1334 },
1335 [1] = {
1336 .name = "md-1",
1337 .owner = THIS_MODULE,
1338 .load_super = super_1_load,
1339 .validate_super = super_1_validate,
1340 .sync_super = super_1_sync,
1341 },
1342};
1da177e4
LT		 1343
1344static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1345{
7dd5e7c3
N		 1346 struct list_head *tmp, *tmp2;
1347 mdk_rdev_t *rdev, *rdev2;
1da177e4 1348
d089c6af
N		 1349 rdev_for_each(rdev, tmp, mddev1)
1350 rdev_for_each(rdev2, tmp2, mddev2)
7dd5e7c3
N		 1351 if (rdev->bdev->bd_contains ==
1352 rdev2->bdev->bd_contains)
1353 return 1;
1da177e4
LT		 1354
1355 return 0;
1356}
1357
1358static LIST_HEAD(pending_raid_disks);
1359
1360static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1361{
7dd5e7c3 1362 char b[BDEVNAME_SIZE];
f637b9f9 1363 struct kobject *ko;
1edf80d3 1364 char *s;
5e55e2f5 1365 int err;
1da177e4
LT		 1366
1367 if (rdev->mddev) {
1368 MD_BUG();
1369 return -EINVAL;
1370 }
2bf071bf
N		 1371 /* make sure rdev->size exceeds mddev->size */
1372 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
a778b73f
N		 1373 if (mddev->pers) {
1374 /* Cannot change size, so fail
1375 * If mddev->level <= 0, then we don't care
1376 * about aligning sizes (e.g. linear)
1377 */
1378 if (mddev->level > 0)
1379 return -ENOSPC;
1380 } else
2bf071bf
N		 1381 mddev->size = rdev->size;
1382 }
1da177e4
LT		 1383
1384 /* Verify rdev->desc_nr is unique.
1385 * If it is -1, assign a free number, else
1386 * check number is not in use
1387 */
1388 if (rdev->desc_nr < 0) {
1389 int choice = 0;
1390 if (mddev->pers) choice = mddev->raid_disks;
1391 while (find_rdev_nr(mddev, choice))
1392 choice++;
1393 rdev->desc_nr = choice;
1394 } else {
1395 if (find_rdev_nr(mddev, rdev->desc_nr))
1396 return -EBUSY;
1397 }
19133a42 1398 bdevname(rdev->bdev,b);
649316b2 1399 while ( (s=strchr(b, '/')) != NULL)
1edf80d3 1400 *s = '!';
649316b2 1401
1da177e4 1402 rdev->mddev = mddev;
19133a42 1403 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 1404
b2d6db58 1405 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
5e55e2f5 1406 goto fail;
86e6ffdd 1407
f637b9f9 1408 if (rdev->bdev->bd_part)
edfaa7c3 1409 ko = &rdev->bdev->bd_part->dev.kobj;
f637b9f9 1410 else
edfaa7c3 1411 ko = &rdev->bdev->bd_disk->dev.kobj;
5e55e2f5
N		 1412 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1413 kobject_del(&rdev->kobj);
1414 goto fail;
1415 }
1416 list_add(&rdev->same_set, &mddev->disks);
c5d79adb 1417 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1da177e4 1418 return 0;
5e55e2f5
N		 1419
1420 fail:
1421 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1422 b, mdname(mddev));
1423 return err;
1da177e4
LT		 1424}
1425
177a99b2 1426static void md_delayed_delete(struct work_struct *ws)
5792a285
N		 1427{
1428 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1429 kobject_del(&rdev->kobj);
177a99b2 1430 kobject_put(&rdev->kobj);
5792a285
N		 1431}
1432
1da177e4
LT		 1433static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1434{
1435 char b[BDEVNAME_SIZE];
1436 if (!rdev->mddev) {
1437 MD_BUG();
1438 return;
1439 }
5463c790 1440 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1da177e4
LT		 1441 list_del_init(&rdev->same_set);
1442 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1443 rdev->mddev = NULL;
86e6ffdd 1444 sysfs_remove_link(&rdev->kobj, "block");
5792a285
N		 1445
1446 /* We need to delay this, otherwise we can deadlock when
1447 * writing to 'remove' to "dev/state"
1448 */
177a99b2
N		 1449 INIT_WORK(&rdev->del_work, md_delayed_delete);
1450 kobject_get(&rdev->kobj);
5792a285 1451 schedule_work(&rdev->del_work);
1da177e4
LT		 1452}
1453
1454/*
1455 * prevent the device from being mounted, repartitioned or
1456 * otherwise reused by a RAID array (or any other kernel
1457 * subsystem), by bd_claiming the device.
1458 */
c5d79adb 1459static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1da177e4
LT		 1460{
1461 int err = 0;
1462 struct block_device *bdev;
1463 char b[BDEVNAME_SIZE];
1464
2e7b651d 1465 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1da177e4
LT		 1466 if (IS_ERR(bdev)) {
1467 printk(KERN_ERR "md: could not open %s.\n",
1468 __bdevname(dev, b));
1469 return PTR_ERR(bdev);
1470 }
c5d79adb 1471 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1da177e4
LT		 1472 if (err) {
1473 printk(KERN_ERR "md: could not bd_claim %s.\n",
1474 bdevname(bdev, b));
2e7b651d 1475 blkdev_put(bdev);
1da177e4
LT		 1476 return err;
1477 }
c5d79adb
N		 1478 if (!shared)
1479 set_bit(AllReserved, &rdev->flags);
1da177e4
LT		 1480 rdev->bdev = bdev;
1481 return err;
1482}
1483
1484static void unlock_rdev(mdk_rdev_t *rdev)
1485{
1486 struct block_device *bdev = rdev->bdev;
1487 rdev->bdev = NULL;
1488 if (!bdev)
1489 MD_BUG();
1490 bd_release(bdev);
2e7b651d 1491 blkdev_put(bdev);
1da177e4
LT		 1492}
1493
1494void md_autodetect_dev(dev_t dev);
1495
1496static void export_rdev(mdk_rdev_t * rdev)
1497{
1498 char b[BDEVNAME_SIZE];
1499 printk(KERN_INFO "md: export_rdev(%s)\n",
1500 bdevname(rdev->bdev,b));
1501 if (rdev->mddev)
1502 MD_BUG();
1503 free_disk_sb(rdev);
1504 list_del_init(&rdev->same_set);
1505#ifndef MODULE
d0fae18f
N		 1506 if (test_bit(AutoDetected, &rdev->flags))
1507 md_autodetect_dev(rdev->bdev->bd_dev);
1da177e4
LT		 1508#endif
1509 unlock_rdev(rdev);
86e6ffdd 1510 kobject_put(&rdev->kobj);
1da177e4
LT		 1511}
1512
1513static void kick_rdev_from_array(mdk_rdev_t * rdev)
1514{
1515 unbind_rdev_from_array(rdev);
1516 export_rdev(rdev);
1517}
1518
1519static void export_array(mddev_t *mddev)
1520{
1521 struct list_head *tmp;
1522 mdk_rdev_t *rdev;
1523
d089c6af 1524 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 1525 if (!rdev->mddev) {
1526 MD_BUG();
1527 continue;
1528 }
1529 kick_rdev_from_array(rdev);
1530 }
1531 if (!list_empty(&mddev->disks))
1532 MD_BUG();
1533 mddev->raid_disks = 0;
1534 mddev->major_version = 0;
1535}
1536
1537static void print_desc(mdp_disk_t *desc)
1538{
1539 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1540 desc->major,desc->minor,desc->raid_disk,desc->state);
1541}
1542
1543static void print_sb(mdp_super_t *sb)
1544{
1545 int i;
1546
1547 printk(KERN_INFO
1548 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1549 sb->major_version, sb->minor_version, sb->patch_version,
1550 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1551 sb->ctime);
1552 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1553 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1554 sb->md_minor, sb->layout, sb->chunk_size);
1555 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1556 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1557 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1558 sb->failed_disks, sb->spare_disks,
1559 sb->sb_csum, (unsigned long)sb->events_lo);
1560
1561 printk(KERN_INFO);
1562 for (i = 0; i < MD_SB_DISKS; i++) {
1563 mdp_disk_t *desc;
1564
1565 desc = sb->disks + i;
1566 if (desc->number || desc->major || desc->minor ||
1567 desc->raid_disk || (desc->state && (desc->state != 4))) {
1568 printk(" D %2d: ", i);
1569 print_desc(desc);
1570 }
1571 }
1572 printk(KERN_INFO "md: THIS: ");
1573 print_desc(&sb->this_disk);
1574
1575}
1576
1577static void print_rdev(mdk_rdev_t *rdev)
1578{
1579 char b[BDEVNAME_SIZE];
1580 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1581 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
b2d444d7
N		 1582 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1583 rdev->desc_nr);
1da177e4
LT		 1584 if (rdev->sb_loaded) {
1585 printk(KERN_INFO "md: rdev superblock:\n");
1586 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1587 } else
1588 printk(KERN_INFO "md: no rdev superblock!\n");
1589}
1590
5e56341d 1591static void md_print_devices(void)
1da177e4
LT		 1592{
1593 struct list_head *tmp, *tmp2;
1594 mdk_rdev_t *rdev;
1595 mddev_t *mddev;
1596 char b[BDEVNAME_SIZE];
1597
1598 printk("\n");
1599 printk("md: **********************************\n");
1600 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1601 printk("md: **********************************\n");
29ac4aa3 1602 for_each_mddev(mddev, tmp) {
1da177e4 1603
32a7627c
N		 1604 if (mddev->bitmap)
1605 bitmap_print_sb(mddev->bitmap);
1606 else
1607 printk("%s: ", mdname(mddev));
d089c6af 1608 rdev_for_each(rdev, tmp2, mddev)
1da177e4
LT		 1609 printk("<%s>", bdevname(rdev->bdev,b));
1610 printk("\n");
1611
d089c6af 1612 rdev_for_each(rdev, tmp2, mddev)
1da177e4
LT		 1613 print_rdev(rdev);
1614 }
1615 printk("md: **********************************\n");
1616 printk("\n");
1617}
1618
1619
42543769 1620static void sync_sbs(mddev_t * mddev, int nospares)
1da177e4 1621{
42543769
N		 1622 /* Update each superblock (in-memory image), but
1623 * if we are allowed to, skip spares which already
1624 * have the right event counter, or have one earlier
1625 * (which would mean they aren't being marked as dirty
1626 * with the rest of the array)
1627 */
1da177e4
LT		 1628 mdk_rdev_t *rdev;
1629 struct list_head *tmp;
1630
d089c6af 1631 rdev_for_each(rdev, tmp, mddev) {
42543769
N		 1632 if (rdev->sb_events == mddev->events ||
1633 (nospares &&
1634 rdev->raid_disk < 0 &&
1635 (rdev->sb_events&1)==0 &&
1636 rdev->sb_events+1 == mddev->events)) {
1637 /* Don't update this superblock */
1638 rdev->sb_loaded = 2;
1639 } else {
1640 super_types[mddev->major_version].
1641 sync_super(mddev, rdev);
1642 rdev->sb_loaded = 1;
1643 }
1da177e4
LT		 1644 }
1645}
1646
850b2b42 1647static void md_update_sb(mddev_t * mddev, int force_change)
1da177e4 1648{
1da177e4
LT		 1649 struct list_head *tmp;
1650 mdk_rdev_t *rdev;
06d91a5f 1651 int sync_req;
42543769 1652 int nospares = 0;
1da177e4 1653
1da177e4 1654repeat:
a9701a30 1655 spin_lock_irq(&mddev->write_lock);
84692195 1656
850b2b42
N		 1657 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1658 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1659 force_change = 1;
1660 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1661 /* just a clean<-> dirty transition, possibly leave spares alone,
1662 * though if events isn't the right even/odd, we will have to do
1663 * spares after all
1664 */
1665 nospares = 1;
1666 if (force_change)
1667 nospares = 0;
1668 if (mddev->degraded)
84692195
N		 1669 /* If the array is degraded, then skipping spares is both
1670 * dangerous and fairly pointless.
1671 * Dangerous because a device that was removed from the array
1672 * might have a event_count that still looks up-to-date,
1673 * so it can be re-added without a resync.
1674 * Pointless because if there are any spares to skip,
1675 * then a recovery will happen and soon that array won't
1676 * be degraded any more and the spare can go back to sleep then.
1677 */
850b2b42 1678 nospares = 0;
84692195 1679
06d91a5f 1680 sync_req = mddev->in_sync;
1da177e4 1681 mddev->utime = get_seconds();
42543769
N		 1682
1683 /* If this is just a dirty<->clean transition, and the array is clean
1684 * and 'events' is odd, we can roll back to the previous clean state */
850b2b42 1685 if (nospares
42543769 1686 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1031be7a
N		 1687 && (mddev->events & 1)
1688 && mddev->events != 1)
42543769
N		 1689 mddev->events--;
1690 else {
1691 /* otherwise we have to go forward and ... */
1692 mddev->events ++;
1693 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1694 /* .. if the array isn't clean, insist on an odd 'events' */
1695 if ((mddev->events&1)==0) {
1696 mddev->events++;
1697 nospares = 0;
1698 }
1699 } else {
1700 /* otherwise insist on an even 'events' (for clean states) */
1701 if ((mddev->events&1)) {
1702 mddev->events++;
1703 nospares = 0;
1704 }
1705 }
1706 }
1da177e4
LT		 1707
1708 if (!mddev->events) {
1709 /*
1710 * oops, this 64-bit counter should never wrap.
1711 * Either we are in around ~1 trillion A.C., assuming
1712 * 1 reboot per second, or we have a bug:
1713 */
1714 MD_BUG();
1715 mddev->events --;
1716 }
1da177e4
LT		 1717
1718 /*
1719 * do not write anything to disk if using
1720 * nonpersistent superblocks
1721 */
06d91a5f 1722 if (!mddev->persistent) {
e691063a
N		 1723 if (!mddev->external)
1724 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1725
a9701a30 1726 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1727 wake_up(&mddev->sb_wait);
1da177e4 1728 return;
06d91a5f 1729 }
e691063a 1730 sync_sbs(mddev, nospares);
a9701a30 1731 spin_unlock_irq(&mddev->write_lock);
1da177e4
LT		 1732
1733 dprintk(KERN_INFO
1734 "md: updating %s RAID superblock on device (in sync %d)\n",
1735 mdname(mddev),mddev->in_sync);
1736
4ad13663 1737 bitmap_update_sb(mddev->bitmap);
d089c6af 1738 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 1739 char b[BDEVNAME_SIZE];
1740 dprintk(KERN_INFO "md: ");
42543769
N		 1741 if (rdev->sb_loaded != 1)
1742 continue; /* no noise on spare devices */
b2d444d7 1743 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1744 dprintk("(skipping faulty ");
1745
1746 dprintk("%s ", bdevname(rdev->bdev,b));
b2d444d7 1747 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 1748 md_super_write(mddev,rdev,
0002b271 1749 rdev->sb_offset<<1, rdev->sb_size,
7bfa19f2
N		 1750 rdev->sb_page);
1751 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1752 bdevname(rdev->bdev,b),
1753 (unsigned long long)rdev->sb_offset);
42543769 1754 rdev->sb_events = mddev->events;
7bfa19f2 1755
1da177e4
LT		 1756 } else
1757 dprintk(")\n");
7bfa19f2 1758 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT		 1759 /* only need to write one superblock... */
1760 break;
1761 }
a9701a30 1762 md_super_wait(mddev);
850b2b42 1763 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
7bfa19f2 1764
a9701a30 1765 spin_lock_irq(&mddev->write_lock);
850b2b42
N		 1766 if (mddev->in_sync != sync_req ||
1767 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
06d91a5f 1768 /* have to write it out again */
a9701a30 1769 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N		 1770 goto repeat;
1771 }
850b2b42 1772 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
a9701a30 1773 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1774 wake_up(&mddev->sb_wait);
06d91a5f 1775
1da177e4
LT		 1776}
1777
bce74dac
N		 1778/* words written to sysfs files may, or my not, be \n terminated.
1779 * We want to accept with case. For this we use cmd_match.
1780 */
1781static int cmd_match(const char *cmd, const char *str)
1782{
1783 /* See if cmd, written into a sysfs file, matches
1784 * str. They must either be the same, or cmd can
1785 * have a trailing newline
1786 */
1787 while (*cmd && *str && *cmd == *str) {
1788 cmd++;
1789 str++;
1790 }
1791 if (*cmd == '\n')
1792 cmd++;
1793 if (*str || *cmd)
1794 return 0;
1795 return 1;
1796}
1797
86e6ffdd
N		 1798struct rdev_sysfs_entry {
1799 struct attribute attr;
1800 ssize_t (*show)(mdk_rdev_t *, char *);
1801 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1802};
1803
1804static ssize_t
96de1e66 1805state_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1806{
1807 char *sep = "";
20a49ff6 1808 size_t len = 0;
86e6ffdd 1809
b2d444d7 1810 if (test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 1811 len+= sprintf(page+len, "%sfaulty",sep);
1812 sep = ",";
1813 }
b2d444d7 1814 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1815 len += sprintf(page+len, "%sin_sync",sep);
1816 sep = ",";
1817 }
f655675b
N		 1818 if (test_bit(WriteMostly, &rdev->flags)) {
1819 len += sprintf(page+len, "%swrite_mostly",sep);
1820 sep = ",";
1821 }
b2d444d7
N		 1822 if (!test_bit(Faulty, &rdev->flags) &&
1823 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1824 len += sprintf(page+len, "%sspare", sep);
1825 sep = ",";
1826 }
1827 return len+sprintf(page+len, "\n");
1828}
1829
45dc2de1
N		 1830static ssize_t
1831state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1832{
1833 /* can write
1834 * faulty - simulates and error
1835 * remove - disconnects the device
f655675b
N		 1836 * writemostly - sets write_mostly
1837 * -writemostly - clears write_mostly
45dc2de1
N		 1838 */
1839 int err = -EINVAL;
1840 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1841 md_error(rdev->mddev, rdev);
1842 err = 0;
1843 } else if (cmd_match(buf, "remove")) {
1844 if (rdev->raid_disk >= 0)
1845 err = -EBUSY;
1846 else {
1847 mddev_t *mddev = rdev->mddev;
1848 kick_rdev_from_array(rdev);
3f9d7b0d
N		 1849 if (mddev->pers)
1850 md_update_sb(mddev, 1);
45dc2de1
N		 1851 md_new_event(mddev);
1852 err = 0;
1853 }
f655675b
N		 1854 } else if (cmd_match(buf, "writemostly")) {
1855 set_bit(WriteMostly, &rdev->flags);
1856 err = 0;
1857 } else if (cmd_match(buf, "-writemostly")) {
1858 clear_bit(WriteMostly, &rdev->flags);
1859 err = 0;
45dc2de1
N		 1860 }
1861 return err ? err : len;
1862}
80ca3a44
N		 1863static struct rdev_sysfs_entry rdev_state =
1864__ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
86e6ffdd
N		 1865
1866static ssize_t
96de1e66 1867super_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1868{
1869 if (rdev->sb_loaded && rdev->sb_size) {
1870 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1871 return rdev->sb_size;
1872 } else
1873 return 0;
1874}
96de1e66
N		 1875static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1876
4dbcdc75
N		 1877static ssize_t
1878errors_show(mdk_rdev_t *rdev, char *page)
1879{
1880 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1881}
1882
1883static ssize_t
1884errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1885{
1886 char *e;
1887 unsigned long n = simple_strtoul(buf, &e, 10);
1888 if (*buf && (*e == 0 || *e == '\n')) {
1889 atomic_set(&rdev->corrected_errors, n);
1890 return len;
1891 }
1892 return -EINVAL;
1893}
1894static struct rdev_sysfs_entry rdev_errors =
80ca3a44 1895__ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
4dbcdc75 1896
014236d2
N		 1897static ssize_t
1898slot_show(mdk_rdev_t *rdev, char *page)
1899{
1900 if (rdev->raid_disk < 0)
1901 return sprintf(page, "none\n");
1902 else
1903 return sprintf(page, "%d\n", rdev->raid_disk);
1904}
1905
1906static ssize_t
1907slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1908{
1909 char *e;
c303da6d
N		 1910 int err;
1911 char nm[20];
014236d2
N		 1912 int slot = simple_strtoul(buf, &e, 10);
1913 if (strncmp(buf, "none", 4)==0)
1914 slot = -1;
1915 else if (e==buf || (*e && *e!= '\n'))
1916 return -EINVAL;
c303da6d
N		 1917 if (rdev->mddev->pers) {
1918 /* Setting 'slot' on an active array requires also
1919 * updating the 'rd%d' link, and communicating
1920 * with the personality with ->hot_*_disk.
1921 * For now we only support removing
1922 * failed/spare devices. This normally happens automatically,
1923 * but not when the metadata is externally managed.
1924 */
1925 if (slot != -1)
1926 return -EBUSY;
1927 if (rdev->raid_disk == -1)
1928 return -EEXIST;
1929 /* personality does all needed checks */
1930 if (rdev->mddev->pers->hot_add_disk == NULL)
1931 return -EINVAL;
1932 err = rdev->mddev->pers->
1933 hot_remove_disk(rdev->mddev, rdev->raid_disk);
1934 if (err)
1935 return err;
1936 sprintf(nm, "rd%d", rdev->raid_disk);
1937 sysfs_remove_link(&rdev->mddev->kobj, nm);
1938 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
1939 md_wakeup_thread(rdev->mddev->thread);
1940 } else {
1941 if (slot >= rdev->mddev->raid_disks)
1942 return -ENOSPC;
1943 rdev->raid_disk = slot;
1944 /* assume it is working */
c5d79adb
N		 1945 clear_bit(Faulty, &rdev->flags);
1946 clear_bit(WriteMostly, &rdev->flags);
c303da6d
N		 1947 set_bit(In_sync, &rdev->flags);
1948 }
014236d2
N		 1949 return len;
1950}
1951
1952
1953static struct rdev_sysfs_entry rdev_slot =
80ca3a44 1954__ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
014236d2 1955
93c8cad0
N		 1956static ssize_t
1957offset_show(mdk_rdev_t *rdev, char *page)
1958{
6961ece4 1959 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
93c8cad0
N		 1960}
1961
1962static ssize_t
1963offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1964{
1965 char *e;
1966 unsigned long long offset = simple_strtoull(buf, &e, 10);
1967 if (e==buf || (*e && *e != '\n'))
1968 return -EINVAL;
1969 if (rdev->mddev->pers)
1970 return -EBUSY;
c5d79adb
N		 1971 if (rdev->size && rdev->mddev->external)
1972 /* Must set offset before size, so overlap checks
1973 * can be sane */
1974 return -EBUSY;
93c8cad0
N		 1975 rdev->data_offset = offset;
1976 return len;
1977}
1978
1979static struct rdev_sysfs_entry rdev_offset =
80ca3a44 1980__ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
93c8cad0 1981
83303b61
N		 1982static ssize_t
1983rdev_size_show(mdk_rdev_t *rdev, char *page)
1984{
1985 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1986}
1987
c5d79adb
N		 1988static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
1989{
1990 /* check if two start/length pairs overlap */
1991 if (s1+l1 <= s2)
1992 return 0;
1993 if (s2+l2 <= s1)
1994 return 0;
1995 return 1;
1996}
1997
83303b61
N		 1998static ssize_t
1999rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2000{
2001 char *e;
2002 unsigned long long size = simple_strtoull(buf, &e, 10);
c5d79adb 2003 unsigned long long oldsize = rdev->size;
83303b61
N		 2004 if (e==buf || (*e && *e != '\n'))
2005 return -EINVAL;
2006 if (rdev->mddev->pers)
2007 return -EBUSY;
2008 rdev->size = size;
c5d79adb
N		 2009 if (size > oldsize && rdev->mddev->external) {
2010 /* need to check that all other rdevs with the same ->bdev
2011 * do not overlap. We need to unlock the mddev to avoid
2012 * a deadlock. We have already changed rdev->size, and if
2013 * we have to change it back, we will have the lock again.
2014 */
2015 mddev_t *mddev;
2016 int overlap = 0;
2017 struct list_head *tmp, *tmp2;
2018
2019 mddev_unlock(rdev->mddev);
29ac4aa3 2020 for_each_mddev(mddev, tmp) {
c5d79adb
N		 2021 mdk_rdev_t *rdev2;
2022
2023 mddev_lock(mddev);
d089c6af 2024 rdev_for_each(rdev2, tmp2, mddev)
c5d79adb
N		 2025 if (test_bit(AllReserved, &rdev2->flags) ||
2026 (rdev->bdev == rdev2->bdev &&
2027 rdev != rdev2 &&
2028 overlaps(rdev->data_offset, rdev->size,
2029 rdev2->data_offset, rdev2->size))) {
2030 overlap = 1;
2031 break;
2032 }
2033 mddev_unlock(mddev);
2034 if (overlap) {
2035 mddev_put(mddev);
2036 break;
2037 }
2038 }
2039 mddev_lock(rdev->mddev);
2040 if (overlap) {
2041 /* Someone else could have slipped in a size
2042 * change here, but doing so is just silly.
2043 * We put oldsize back because we *know* it is
2044 * safe, and trust userspace not to race with
2045 * itself
2046 */
2047 rdev->size = oldsize;
2048 return -EBUSY;
2049 }
2050 }
83303b61
N		 2051 if (size < rdev->mddev->size || rdev->mddev->size == 0)
2052 rdev->mddev->size = size;
2053 return len;
2054}
2055
2056static struct rdev_sysfs_entry rdev_size =
80ca3a44 2057__ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
83303b61 2058
86e6ffdd
N		 2059static struct attribute *rdev_default_attrs[] = {
2060 &rdev_state.attr,
2061 &rdev_super.attr,
4dbcdc75 2062 &rdev_errors.attr,
014236d2 2063 &rdev_slot.attr,
93c8cad0 2064 &rdev_offset.attr,
83303b61 2065 &rdev_size.attr,
86e6ffdd
N		 2066 NULL,
2067};
2068static ssize_t
2069rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2070{
2071 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2072 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2073
2074 if (!entry->show)
2075 return -EIO;
2076 return entry->show(rdev, page);
2077}
2078
2079static ssize_t
2080rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2081 const char *page, size_t length)
2082{
2083 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2084 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
ca388059 2085 int rv;
86e6ffdd
N		 2086
2087 if (!entry->store)
2088 return -EIO;
67463acb
N		 2089 if (!capable(CAP_SYS_ADMIN))
2090 return -EACCES;
ca388059
N		 2091 rv = mddev_lock(rdev->mddev);
2092 if (!rv) {
2093 rv = entry->store(rdev, page, length);
2094 mddev_unlock(rdev->mddev);
2095 }
2096 return rv;
86e6ffdd
N		 2097}
2098
2099static void rdev_free(struct kobject *ko)
2100{
2101 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2102 kfree(rdev);
2103}
2104static struct sysfs_ops rdev_sysfs_ops = {
2105 .show = rdev_attr_show,
2106 .store = rdev_attr_store,
2107};
2108static struct kobj_type rdev_ktype = {
2109 .release = rdev_free,
2110 .sysfs_ops = &rdev_sysfs_ops,
2111 .default_attrs = rdev_default_attrs,
2112};
2113
1da177e4
LT		 2114/*
2115 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2116 *
2117 * mark the device faulty if:
2118 *
2119 * - the device is nonexistent (zero size)
2120 * - the device has no valid superblock
2121 *
2122 * a faulty rdev _never_ has rdev->sb set.
2123 */
2124static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2125{
2126 char b[BDEVNAME_SIZE];
2127 int err;
2128 mdk_rdev_t *rdev;
2129 sector_t size;
2130
9ffae0cf 2131 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1da177e4
LT		 2132 if (!rdev) {
2133 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2134 return ERR_PTR(-ENOMEM);
2135 }
1da177e4
LT		 2136
2137 if ((err = alloc_disk_sb(rdev)))
2138 goto abort_free;
2139
c5d79adb 2140 err = lock_rdev(rdev, newdev, super_format == -2);
1da177e4
LT		 2141 if (err)
2142 goto abort_free;
2143
f9cb074b 2144 kobject_init(&rdev->kobj, &rdev_ktype);
86e6ffdd 2145
1da177e4 2146 rdev->desc_nr = -1;
2b6e8459 2147 rdev->saved_raid_disk = -1;
3f9d7b0d 2148 rdev->raid_disk = -1;
b2d444d7 2149 rdev->flags = 0;
1da177e4 2150 rdev->data_offset = 0;
42543769 2151 rdev->sb_events = 0;
1da177e4 2152 atomic_set(&rdev->nr_pending, 0);
ba22dcbf 2153 atomic_set(&rdev->read_errors, 0);
4dbcdc75 2154 atomic_set(&rdev->corrected_errors, 0);
1da177e4
LT		 2155
2156 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2157 if (!size) {
2158 printk(KERN_WARNING
2159 "md: %s has zero or unknown size, marking faulty!\n",
2160 bdevname(rdev->bdev,b));
2161 err = -EINVAL;
2162 goto abort_free;
2163 }
2164
2165 if (super_format >= 0) {
2166 err = super_types[super_format].
2167 load_super(rdev, NULL, super_minor);
2168 if (err == -EINVAL) {
df968c4e
N		 2169 printk(KERN_WARNING
2170 "md: %s does not have a valid v%d.%d "
2171 "superblock, not importing!\n",
2172 bdevname(rdev->bdev,b),
2173 super_format, super_minor);
1da177e4
LT		 2174 goto abort_free;
2175 }
2176 if (err < 0) {
2177 printk(KERN_WARNING
2178 "md: could not read %s's sb, not importing!\n",
2179 bdevname(rdev->bdev,b));
2180 goto abort_free;
2181 }
2182 }
2183 INIT_LIST_HEAD(&rdev->same_set);
2184
2185 return rdev;
2186
2187abort_free:
2188 if (rdev->sb_page) {
2189 if (rdev->bdev)
2190 unlock_rdev(rdev);
2191 free_disk_sb(rdev);
2192 }
2193 kfree(rdev);
2194 return ERR_PTR(err);
2195}
2196
2197/*
2198 * Check a full RAID array for plausibility
2199 */
2200
2201
a757e64c 2202static void analyze_sbs(mddev_t * mddev)
1da177e4
LT		 2203{
2204 int i;
2205 struct list_head *tmp;
2206 mdk_rdev_t *rdev, *freshest;
2207 char b[BDEVNAME_SIZE];
2208
2209 freshest = NULL;
d089c6af 2210 rdev_for_each(rdev, tmp, mddev)
1da177e4
LT		 2211 switch (super_types[mddev->major_version].
2212 load_super(rdev, freshest, mddev->minor_version)) {
2213 case 1:
2214 freshest = rdev;
2215 break;
2216 case 0:
2217 break;
2218 default:
2219 printk( KERN_ERR \
2220 "md: fatal superblock inconsistency in %s"
2221 " -- removing from array\n",
2222 bdevname(rdev->bdev,b));
2223 kick_rdev_from_array(rdev);
2224 }
2225
2226
2227 super_types[mddev->major_version].
2228 validate_super(mddev, freshest);
2229
2230 i = 0;
d089c6af 2231 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 2232 if (rdev != freshest)
2233 if (super_types[mddev->major_version].
2234 validate_super(mddev, rdev)) {
2235 printk(KERN_WARNING "md: kicking non-fresh %s"
2236 " from array!\n",
2237 bdevname(rdev->bdev,b));
2238 kick_rdev_from_array(rdev);
2239 continue;
2240 }
2241 if (mddev->level == LEVEL_MULTIPATH) {
2242 rdev->desc_nr = i++;
2243 rdev->raid_disk = rdev->desc_nr;
b2d444d7 2244 set_bit(In_sync, &rdev->flags);
a778b73f
N		 2245 } else if (rdev->raid_disk >= mddev->raid_disks) {
2246 rdev->raid_disk = -1;
2247 clear_bit(In_sync, &rdev->flags);
1da177e4
LT		 2248 }
2249 }
2250
2251
2252
2253 if (mddev->recovery_cp != MaxSector &&
2254 mddev->level >= 1)
2255 printk(KERN_ERR "md: %s: raid array is not clean"
2256 " -- starting background reconstruction\n",
2257 mdname(mddev));
2258
1da177e4
LT		 2259}
2260
16f17b39
N		 2261static ssize_t
2262safe_delay_show(mddev_t *mddev, char *page)
2263{
2264 int msec = (mddev->safemode_delay*1000)/HZ;
2265 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2266}
2267static ssize_t
2268safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2269{
2270 int scale=1;
2271 int dot=0;
2272 int i;
2273 unsigned long msec;
2274 char buf[30];
2275 char *e;
2276 /* remove a period, and count digits after it */
2277 if (len >= sizeof(buf))
2278 return -EINVAL;
2279 strlcpy(buf, cbuf, len);
2280 buf[len] = 0;
2281 for (i=0; i<len; i++) {
2282 if (dot) {
2283 if (isdigit(buf[i])) {
2284 buf[i-1] = buf[i];
2285 scale *= 10;
2286 }
2287 buf[i] = 0;
2288 } else if (buf[i] == '.') {
2289 dot=1;
2290 buf[i] = 0;
2291 }
2292 }
2293 msec = simple_strtoul(buf, &e, 10);
2294 if (e == buf || (*e && *e != '\n'))
2295 return -EINVAL;
2296 msec = (msec * 1000) / scale;
2297 if (msec == 0)
2298 mddev->safemode_delay = 0;
2299 else {
2300 mddev->safemode_delay = (msec*HZ)/1000;
2301 if (mddev->safemode_delay == 0)
2302 mddev->safemode_delay = 1;
2303 }
2304 return len;
2305}
2306static struct md_sysfs_entry md_safe_delay =
80ca3a44 2307__ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
16f17b39 2308
eae1701f 2309static ssize_t
96de1e66 2310level_show(mddev_t *mddev, char *page)
eae1701f 2311{
2604b703 2312 struct mdk_personality *p = mddev->pers;
d9d166c2 2313 if (p)
eae1701f 2314 return sprintf(page, "%s\n", p->name);
d9d166c2
N		 2315 else if (mddev->clevel[0])
2316 return sprintf(page, "%s\n", mddev->clevel);
2317 else if (mddev->level != LEVEL_NONE)
2318 return sprintf(page, "%d\n", mddev->level);
2319 else
2320 return 0;
eae1701f
N		 2321}
2322
d9d166c2
N		 2323static ssize_t
2324level_store(mddev_t *mddev, const char *buf, size_t len)
2325{
20a49ff6 2326 ssize_t rv = len;
d9d166c2
N		 2327 if (mddev->pers)
2328 return -EBUSY;
2329 if (len == 0)
2330 return 0;
2331 if (len >= sizeof(mddev->clevel))
2332 return -ENOSPC;
2333 strncpy(mddev->clevel, buf, len);
2334 if (mddev->clevel[len-1] == '\n')
2335 len--;
2336 mddev->clevel[len] = 0;
2337 mddev->level = LEVEL_NONE;
2338 return rv;
2339}
2340
2341static struct md_sysfs_entry md_level =
80ca3a44 2342__ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
eae1701f 2343
d4dbd025
N		 2344
2345static ssize_t
2346layout_show(mddev_t *mddev, char *page)
2347{
2348 /* just a number, not meaningful for all levels */
08a02ecd
N		 2349 if (mddev->reshape_position != MaxSector &&
2350 mddev->layout != mddev->new_layout)
2351 return sprintf(page, "%d (%d)\n",
2352 mddev->new_layout, mddev->layout);
d4dbd025
N		 2353 return sprintf(page, "%d\n", mddev->layout);
2354}
2355
2356static ssize_t
2357layout_store(mddev_t *mddev, const char *buf, size_t len)
2358{
2359 char *e;
2360 unsigned long n = simple_strtoul(buf, &e, 10);
d4dbd025
N		 2361
2362 if (!*buf || (*e && *e != '\n'))
2363 return -EINVAL;
2364
08a02ecd
N		 2365 if (mddev->pers)
2366 return -EBUSY;
2367 if (mddev->reshape_position != MaxSector)
2368 mddev->new_layout = n;
2369 else
2370 mddev->layout = n;
d4dbd025
N		 2371 return len;
2372}
2373static struct md_sysfs_entry md_layout =
80ca3a44 2374__ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
d4dbd025
N		 2375
2376
eae1701f 2377static ssize_t
96de1e66 2378raid_disks_show(mddev_t *mddev, char *page)
eae1701f 2379{
bb636547
N		 2380 if (mddev->raid_disks == 0)
2381 return 0;
08a02ecd
N		 2382 if (mddev->reshape_position != MaxSector &&
2383 mddev->delta_disks != 0)
2384 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2385 mddev->raid_disks - mddev->delta_disks);
eae1701f
N		 2386 return sprintf(page, "%d\n", mddev->raid_disks);
2387}
2388
da943b99
N		 2389static int update_raid_disks(mddev_t *mddev, int raid_disks);
2390
2391static ssize_t
2392raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2393{
da943b99
N		 2394 char *e;
2395 int rv = 0;
2396 unsigned long n = simple_strtoul(buf, &e, 10);
2397
2398 if (!*buf || (*e && *e != '\n'))
2399 return -EINVAL;
2400
2401 if (mddev->pers)
2402 rv = update_raid_disks(mddev, n);
08a02ecd
N		 2403 else if (mddev->reshape_position != MaxSector) {
2404 int olddisks = mddev->raid_disks - mddev->delta_disks;
2405 mddev->delta_disks = n - olddisks;
2406 mddev->raid_disks = n;
2407 } else
da943b99
N		 2408 mddev->raid_disks = n;
2409 return rv ? rv : len;
2410}
2411static struct md_sysfs_entry md_raid_disks =
80ca3a44 2412__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
eae1701f 2413
3b34380a
N		 2414static ssize_t
2415chunk_size_show(mddev_t *mddev, char *page)
2416{
08a02ecd
N		 2417 if (mddev->reshape_position != MaxSector &&
2418 mddev->chunk_size != mddev->new_chunk)
2419 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2420 mddev->chunk_size);
3b34380a
N		 2421 return sprintf(page, "%d\n", mddev->chunk_size);
2422}
2423
2424static ssize_t
2425chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2426{
2427 /* can only set chunk_size if array is not yet active */
2428 char *e;
2429 unsigned long n = simple_strtoul(buf, &e, 10);
2430
3b34380a
N		 2431 if (!*buf || (*e && *e != '\n'))
2432 return -EINVAL;
2433
08a02ecd
N		 2434 if (mddev->pers)
2435 return -EBUSY;
2436 else if (mddev->reshape_position != MaxSector)
2437 mddev->new_chunk = n;
2438 else
2439 mddev->chunk_size = n;
3b34380a
N		 2440 return len;
2441}
2442static struct md_sysfs_entry md_chunk_size =
80ca3a44 2443__ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3b34380a 2444
a94213b1
N		 2445static ssize_t
2446resync_start_show(mddev_t *mddev, char *page)
2447{
2448 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2449}
2450
2451static ssize_t
2452resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2453{
2454 /* can only set chunk_size if array is not yet active */
2455 char *e;
2456 unsigned long long n = simple_strtoull(buf, &e, 10);
2457
2458 if (mddev->pers)
2459 return -EBUSY;
2460 if (!*buf || (*e && *e != '\n'))
2461 return -EINVAL;
2462
2463 mddev->recovery_cp = n;
2464 return len;
2465}
2466static struct md_sysfs_entry md_resync_start =
80ca3a44 2467__ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
a94213b1 2468
9e653b63
N		 2469/*
2470 * The array state can be:
2471 *
2472 * clear
2473 * No devices, no size, no level
2474 * Equivalent to STOP_ARRAY ioctl
2475 * inactive
2476 * May have some settings, but array is not active
2477 * all IO results in error
2478 * When written, doesn't tear down array, but just stops it
2479 * suspended (not supported yet)
2480 * All IO requests will block. The array can be reconfigured.
2481 * Writing this, if accepted, will block until array is quiessent
2482 * readonly
2483 * no resync can happen. no superblocks get written.
2484 * write requests fail
2485 * read-auto
2486 * like readonly, but behaves like 'clean' on a write request.
2487 *
2488 * clean - no pending writes, but otherwise active.
2489 * When written to inactive array, starts without resync
2490 * If a write request arrives then
2491 * if metadata is known, mark 'dirty' and switch to 'active'.
2492 * if not known, block and switch to write-pending
2493 * If written to an active array that has pending writes, then fails.
2494 * active
2495 * fully active: IO and resync can be happening.
2496 * When written to inactive array, starts with resync
2497 *
2498 * write-pending
2499 * clean, but writes are blocked waiting for 'active' to be written.
2500 *
2501 * active-idle
2502 * like active, but no writes have been seen for a while (100msec).
2503 *
2504 */
2505enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2506 write_pending, active_idle, bad_word};
05381954 2507static char *array_states[] = {
9e653b63
N		 2508 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2509 "write-pending", "active-idle", NULL };
2510
2511static int match_word(const char *word, char **list)
2512{
2513 int n;
2514 for (n=0; list[n]; n++)
2515 if (cmd_match(word, list[n]))
2516 break;
2517 return n;
2518}
2519
2520static ssize_t
2521array_state_show(mddev_t *mddev, char *page)
2522{
2523 enum array_state st = inactive;
2524
2525 if (mddev->pers)
2526 switch(mddev->ro) {
2527 case 1:
2528 st = readonly;
2529 break;
2530 case 2:
2531 st = read_auto;
2532 break;
2533 case 0:
2534 if (mddev->in_sync)
2535 st = clean;
e691063a
N		 2536 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
2537 st = write_pending;
9e653b63
N		 2538 else if (mddev->safemode)
2539 st = active_idle;
2540 else
2541 st = active;
2542 }
2543 else {
2544 if (list_empty(&mddev->disks) &&
2545 mddev->raid_disks == 0 &&
2546 mddev->size == 0)
2547 st = clear;
2548 else
2549 st = inactive;
2550 }
2551 return sprintf(page, "%s\n", array_states[st]);
2552}
2553
2554static int do_md_stop(mddev_t * mddev, int ro);
2555static int do_md_run(mddev_t * mddev);
2556static int restart_array(mddev_t *mddev);
2557
2558static ssize_t
2559array_state_store(mddev_t *mddev, const char *buf, size_t len)
2560{
2561 int err = -EINVAL;
2562 enum array_state st = match_word(buf, array_states);
2563 switch(st) {
2564 case bad_word:
2565 break;
2566 case clear:
2567 /* stopping an active array */
e691063a
N		 2568 if (atomic_read(&mddev->active) > 1)
2569 return -EBUSY;
2570 err = do_md_stop(mddev, 0);
9e653b63
N		 2571 break;
2572 case inactive:
2573 /* stopping an active array */
2574 if (mddev->pers) {
2575 if (atomic_read(&mddev->active) > 1)
2576 return -EBUSY;
2577 err = do_md_stop(mddev, 2);
e691063a
N		 2578 } else
2579 err = 0; /* already inactive */
9e653b63
N		 2580 break;
2581 case suspended:
2582 break; /* not supported yet */
2583 case readonly:
2584 if (mddev->pers)
2585 err = do_md_stop(mddev, 1);
2586 else {
2587 mddev->ro = 1;
2588 err = do_md_run(mddev);
2589 }
2590 break;
2591 case read_auto:
2592 /* stopping an active array */
2593 if (mddev->pers) {
2594 err = do_md_stop(mddev, 1);
2595 if (err == 0)
2596 mddev->ro = 2; /* FIXME mark devices writable */
2597 } else {
2598 mddev->ro = 2;
2599 err = do_md_run(mddev);
2600 }
2601 break;
2602 case clean:
2603 if (mddev->pers) {
2604 restart_array(mddev);
2605 spin_lock_irq(&mddev->write_lock);
2606 if (atomic_read(&mddev->writes_pending) == 0) {
e691063a
N		 2607 if (mddev->in_sync == 0) {
2608 mddev->in_sync = 1;
2609 if (mddev->persistent)
2610 set_bit(MD_CHANGE_CLEAN,
2611 &mddev->flags);
2612 }
2613 err = 0;
2614 } else
2615 err = -EBUSY;
9e653b63
N		 2616 spin_unlock_irq(&mddev->write_lock);
2617 } else {
2618 mddev->ro = 0;
2619 mddev->recovery_cp = MaxSector;
2620 err = do_md_run(mddev);
2621 }
2622 break;
2623 case active:
2624 if (mddev->pers) {
2625 restart_array(mddev);
e691063a
N		 2626 if (mddev->external)
2627 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
9e653b63
N		 2628 wake_up(&mddev->sb_wait);
2629 err = 0;
2630 } else {
2631 mddev->ro = 0;
2632 err = do_md_run(mddev);
2633 }
2634 break;
2635 case write_pending:
2636 case active_idle:
2637 /* these cannot be set */
2638 break;
2639 }
2640 if (err)
2641 return err;
2642 else
2643 return len;
2644}
80ca3a44
N		 2645static struct md_sysfs_entry md_array_state =
2646__ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
9e653b63 2647
6d7ff738
N		 2648static ssize_t
2649null_show(mddev_t *mddev, char *page)
2650{
2651 return -EINVAL;
2652}
2653
2654static ssize_t
2655new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2656{
2657 /* buf must be %d:%d\n? giving major and minor numbers */
2658 /* The new device is added to the array.
2659 * If the array has a persistent superblock, we read the
2660 * superblock to initialise info and check validity.
2661 * Otherwise, only checking done is that in bind_rdev_to_array,
2662 * which mainly checks size.
2663 */
2664 char *e;
2665 int major = simple_strtoul(buf, &e, 10);
2666 int minor;
2667 dev_t dev;
2668 mdk_rdev_t *rdev;
2669 int err;
2670
2671 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2672 return -EINVAL;
2673 minor = simple_strtoul(e+1, &e, 10);
2674 if (*e && *e != '\n')
2675 return -EINVAL;
2676 dev = MKDEV(major, minor);
2677 if (major != MAJOR(dev) ||
2678 minor != MINOR(dev))
2679 return -EOVERFLOW;
2680
2681
2682 if (mddev->persistent) {
2683 rdev = md_import_device(dev, mddev->major_version,
2684 mddev->minor_version);
2685 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2686 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2687 mdk_rdev_t, same_set);
2688 err = super_types[mddev->major_version]
2689 .load_super(rdev, rdev0, mddev->minor_version);
2690 if (err < 0)
2691 goto out;
2692 }
c5d79adb
N		 2693 } else if (mddev->external)
2694 rdev = md_import_device(dev, -2, -1);
2695 else
6d7ff738
N		 2696 rdev = md_import_device(dev, -1, -1);
2697
2698 if (IS_ERR(rdev))
2699 return PTR_ERR(rdev);
2700 err = bind_rdev_to_array(rdev, mddev);
2701 out:
2702 if (err)
2703 export_rdev(rdev);
2704 return err ? err : len;
2705}
2706
2707static struct md_sysfs_entry md_new_device =
80ca3a44 2708__ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3b34380a 2709
9b1d1dac
PC		 2710static ssize_t
2711bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2712{
2713 char *end;
2714 unsigned long chunk, end_chunk;
2715
2716 if (!mddev->bitmap)
2717 goto out;
2718 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2719 while (*buf) {
2720 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2721 if (buf == end) break;
2722 if (*end == '-') { /* range */
2723 buf = end + 1;
2724 end_chunk = simple_strtoul(buf, &end, 0);
2725 if (buf == end) break;
2726 }
2727 if (*end && !isspace(*end)) break;
2728 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2729 buf = end;
2730 while (isspace(*buf)) buf++;
2731 }
2732 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2733out:
2734 return len;
2735}
2736
2737static struct md_sysfs_entry md_bitmap =
2738__ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2739
a35b0d69
N		 2740static ssize_t
2741size_show(mddev_t *mddev, char *page)
2742{
2743 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2744}
2745
2746static int update_size(mddev_t *mddev, unsigned long size);
2747
2748static ssize_t
2749size_store(mddev_t *mddev, const char *buf, size_t len)
2750{
2751 /* If array is inactive, we can reduce the component size, but
2752 * not increase it (except from 0).
2753 * If array is active, we can try an on-line resize
2754 */
2755 char *e;
2756 int err = 0;
2757 unsigned long long size = simple_strtoull(buf, &e, 10);
2758 if (!*buf || *buf == '\n' ||
2759 (*e && *e != '\n'))
2760 return -EINVAL;
2761
2762 if (mddev->pers) {
2763 err = update_size(mddev, size);
850b2b42 2764 md_update_sb(mddev, 1);
a35b0d69
N		 2765 } else {
2766 if (mddev->size == 0 ||
2767 mddev->size > size)
2768 mddev->size = size;
2769 else
2770 err = -ENOSPC;
2771 }
2772 return err ? err : len;
2773}
2774
2775static struct md_sysfs_entry md_size =
80ca3a44 2776__ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
a35b0d69 2777
8bb93aac
N		 2778
2779/* Metdata version.
e691063a
N		 2780 * This is one of
2781 * 'none' for arrays with no metadata (good luck...)
2782 * 'external' for arrays with externally managed metadata,
8bb93aac
N		 2783 * or N.M for internally known formats
2784 */
2785static ssize_t
2786metadata_show(mddev_t *mddev, char *page)
2787{
2788 if (mddev->persistent)
2789 return sprintf(page, "%d.%d\n",
2790 mddev->major_version, mddev->minor_version);
e691063a
N		 2791 else if (mddev->external)
2792 return sprintf(page, "external:%s\n", mddev->metadata_type);
8bb93aac
N		 2793 else
2794 return sprintf(page, "none\n");
2795}
2796
2797static ssize_t
2798metadata_store(mddev_t *mddev, const char *buf, size_t len)
2799{
2800 int major, minor;
2801 char *e;
2802 if (!list_empty(&mddev->disks))
2803 return -EBUSY;
2804
2805 if (cmd_match(buf, "none")) {
2806 mddev->persistent = 0;
e691063a
N		 2807 mddev->external = 0;
2808 mddev->major_version = 0;
2809 mddev->minor_version = 90;
2810 return len;
2811 }
2812 if (strncmp(buf, "external:", 9) == 0) {
20a49ff6 2813 size_t namelen = len-9;
e691063a
N		 2814 if (namelen >= sizeof(mddev->metadata_type))
2815 namelen = sizeof(mddev->metadata_type)-1;
2816 strncpy(mddev->metadata_type, buf+9, namelen);
2817 mddev->metadata_type[namelen] = 0;
2818 if (namelen && mddev->metadata_type[namelen-1] == '\n')
2819 mddev->metadata_type[--namelen] = 0;
2820 mddev->persistent = 0;
2821 mddev->external = 1;
8bb93aac
N		 2822 mddev->major_version = 0;
2823 mddev->minor_version = 90;
2824 return len;
2825 }
2826 major = simple_strtoul(buf, &e, 10);
2827 if (e==buf || *e != '.')
2828 return -EINVAL;
2829 buf = e+1;
2830 minor = simple_strtoul(buf, &e, 10);
3f9d7b0d 2831 if (e==buf || (*e && *e != '\n') )
8bb93aac 2832 return -EINVAL;
50511da3 2833 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
8bb93aac
N		 2834 return -ENOENT;
2835 mddev->major_version = major;
2836 mddev->minor_version = minor;
2837 mddev->persistent = 1;
e691063a 2838 mddev->external = 0;
8bb93aac
N		 2839 return len;
2840}
2841
2842static struct md_sysfs_entry md_metadata =
80ca3a44 2843__ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
8bb93aac 2844
24dd469d 2845static ssize_t
7eec314d 2846action_show(mddev_t *mddev, char *page)
24dd469d 2847{
7eec314d 2848 char *type = "idle";
31399d9e 2849 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2b12ab6d 2850 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
ccfcc3c1
N		 2851 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2852 type = "reshape";
2853 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N		 2854 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2855 type = "resync";
2856 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2857 type = "check";
2858 else
2859 type = "repair";
2860 } else
2861 type = "recover";
2862 }
2863 return sprintf(page, "%s\n", type);
2864}
2865
2866static ssize_t
7eec314d 2867action_store(mddev_t *mddev, const char *page, size_t len)
24dd469d 2868{
7eec314d
N		 2869 if (!mddev->pers || !mddev->pers->sync_request)
2870 return -EINVAL;
2871
bce74dac 2872 if (cmd_match(page, "idle")) {
7eec314d
N		 2873 if (mddev->sync_thread) {
2874 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2875 md_unregister_thread(mddev->sync_thread);
2876 mddev->sync_thread = NULL;
2877 mddev->recovery = 0;
2878 }
03c902e1
N		 2879 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2880 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 2881 return -EBUSY;
03c902e1 2882 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
7eec314d 2883 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
16484bf5
N		 2884 else if (cmd_match(page, "reshape")) {
2885 int err;
2886 if (mddev->pers->start_reshape == NULL)
2887 return -EINVAL;
2888 err = mddev->pers->start_reshape(mddev);
2889 if (err)
2890 return err;
2891 } else {
bce74dac 2892 if (cmd_match(page, "check"))
7eec314d 2893 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2adc7d47 2894 else if (!cmd_match(page, "repair"))
7eec314d
N		 2895 return -EINVAL;
2896 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2897 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7eec314d 2898 }
03c902e1 2899 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d
N		 2900 md_wakeup_thread(mddev->thread);
2901 return len;
2902}
2903
9d88883e 2904static ssize_t
96de1e66 2905mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 2906{
2907 return sprintf(page, "%llu\n",
2908 (unsigned long long) mddev->resync_mismatches);
2909}
2910
80ca3a44
N		 2911static struct md_sysfs_entry md_scan_mode =
2912__ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 2913
96de1e66 2914
80ca3a44 2915static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 2916
88202a0c
N		 2917static ssize_t
2918sync_min_show(mddev_t *mddev, char *page)
2919{
2920 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2921 mddev->sync_speed_min ? "local": "system");
2922}
2923
2924static ssize_t
2925sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2926{
2927 int min;
2928 char *e;
2929 if (strncmp(buf, "system", 6)==0) {
2930 mddev->sync_speed_min = 0;
2931 return len;
2932 }
2933 min = simple_strtoul(buf, &e, 10);
2934 if (buf == e || (*e && *e != '\n') || min <= 0)
2935 return -EINVAL;
2936 mddev->sync_speed_min = min;
2937 return len;
2938}
2939
2940static struct md_sysfs_entry md_sync_min =
2941__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2942
2943static ssize_t
2944sync_max_show(mddev_t *mddev, char *page)
2945{
2946 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2947 mddev->sync_speed_max ? "local": "system");
2948}
2949
2950static ssize_t
2951sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2952{
2953 int max;
2954 char *e;
2955 if (strncmp(buf, "system", 6)==0) {
2956 mddev->sync_speed_max = 0;
2957 return len;
2958 }
2959 max = simple_strtoul(buf, &e, 10);
2960 if (buf == e || (*e && *e != '\n') || max <= 0)
2961 return -EINVAL;
2962 mddev->sync_speed_max = max;
2963 return len;
2964}
2965
2966static struct md_sysfs_entry md_sync_max =
2967__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2968
d7f3d291
IP		 2969static ssize_t
2970degraded_show(mddev_t *mddev, char *page)
2971{
2972 return sprintf(page, "%d\n", mddev->degraded);
2973}
2974static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
88202a0c
N		 2975
2976static ssize_t
2977sync_speed_show(mddev_t *mddev, char *page)
2978{
2979 unsigned long resync, dt, db;
ff4e8d9a 2980 resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active));
88202a0c
N		 2981 dt = ((jiffies - mddev->resync_mark) / HZ);
2982 if (!dt) dt++;
2983 db = resync - (mddev->resync_mark_cnt);
2984 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2985}
2986
80ca3a44 2987static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
88202a0c
N		 2988
2989static ssize_t
2990sync_completed_show(mddev_t *mddev, char *page)
2991{
2992 unsigned long max_blocks, resync;
2993
2994 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2995 max_blocks = mddev->resync_max_sectors;
2996 else
2997 max_blocks = mddev->size << 1;
2998
2999 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
3000 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
3001}
3002
80ca3a44 3003static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
88202a0c 3004
c6207277
N		 3005static ssize_t
3006max_sync_show(mddev_t *mddev, char *page)
3007{
3008 if (mddev->resync_max == MaxSector)
3009 return sprintf(page, "max\n");
3010 else
3011 return sprintf(page, "%llu\n",
3012 (unsigned long long)mddev->resync_max);
3013}
3014static ssize_t
3015max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3016{
3017 if (strncmp(buf, "max", 3) == 0)
3018 mddev->resync_max = MaxSector;
3019 else {
3020 char *ep;
3021 unsigned long long max = simple_strtoull(buf, &ep, 10);
3022 if (ep == buf || (*ep != 0 && *ep != '\n'))
3023 return -EINVAL;
3024 if (max < mddev->resync_max &&
3025 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3026 return -EBUSY;
3027
3028 /* Must be a multiple of chunk_size */
3029 if (mddev->chunk_size) {
3030 if (max & (sector_t)((mddev->chunk_size>>9)-1))
3031 return -EINVAL;
3032 }
3033 mddev->resync_max = max;
3034 }
3035 wake_up(&mddev->recovery_wait);
3036 return len;
3037}
3038
3039static struct md_sysfs_entry md_max_sync =
3040__ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3041
e464eafd
N		 3042static ssize_t
3043suspend_lo_show(mddev_t *mddev, char *page)
3044{
3045 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3046}
3047
3048static ssize_t
3049suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3050{
3051 char *e;
3052 unsigned long long new = simple_strtoull(buf, &e, 10);
3053
3054 if (mddev->pers->quiesce == NULL)
3055 return -EINVAL;
3056 if (buf == e || (*e && *e != '\n'))
3057 return -EINVAL;
3058 if (new >= mddev->suspend_hi ||
3059 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3060 mddev->suspend_lo = new;
3061 mddev->pers->quiesce(mddev, 2);
3062 return len;
3063 } else
3064 return -EINVAL;
3065}
3066static struct md_sysfs_entry md_suspend_lo =
3067__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3068
3069
3070static ssize_t
3071suspend_hi_show(mddev_t *mddev, char *page)
3072{
3073 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3074}
3075
3076static ssize_t
3077suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3078{
3079 char *e;
3080 unsigned long long new = simple_strtoull(buf, &e, 10);
3081
3082 if (mddev->pers->quiesce == NULL)
3083 return -EINVAL;
3084 if (buf == e || (*e && *e != '\n'))
3085 return -EINVAL;
3086 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3087 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3088 mddev->suspend_hi = new;
3089 mddev->pers->quiesce(mddev, 1);
3090 mddev->pers->quiesce(mddev, 0);
3091 return len;
3092 } else
3093 return -EINVAL;
3094}
3095static struct md_sysfs_entry md_suspend_hi =
3096__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3097
08a02ecd
N		 3098static ssize_t
3099reshape_position_show(mddev_t *mddev, char *page)
3100{
3101 if (mddev->reshape_position != MaxSector)
3102 return sprintf(page, "%llu\n",
3103 (unsigned long long)mddev->reshape_position);
3104 strcpy(page, "none\n");
3105 return 5;
3106}
3107
3108static ssize_t
3109reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3110{
3111 char *e;
3112 unsigned long long new = simple_strtoull(buf, &e, 10);
3113 if (mddev->pers)
3114 return -EBUSY;
3115 if (buf == e || (*e && *e != '\n'))
3116 return -EINVAL;
3117 mddev->reshape_position = new;
3118 mddev->delta_disks = 0;
3119 mddev->new_level = mddev->level;
3120 mddev->new_layout = mddev->layout;
3121 mddev->new_chunk = mddev->chunk_size;
3122 return len;
3123}
3124
3125static struct md_sysfs_entry md_reshape_position =
3126__ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3127 reshape_position_store);
3128
e464eafd 3129
eae1701f
N		 3130static struct attribute *md_default_attrs[] = {
3131 &md_level.attr,
d4dbd025 3132 &md_layout.attr,
eae1701f 3133 &md_raid_disks.attr,
3b34380a 3134 &md_chunk_size.attr,
a35b0d69 3135 &md_size.attr,
a94213b1 3136 &md_resync_start.attr,
8bb93aac 3137 &md_metadata.attr,
6d7ff738 3138 &md_new_device.attr,
16f17b39 3139 &md_safe_delay.attr,
9e653b63 3140 &md_array_state.attr,
08a02ecd 3141 &md_reshape_position.attr,
411036fa
N		 3142 NULL,
3143};
3144
3145static struct attribute *md_redundancy_attrs[] = {
24dd469d 3146 &md_scan_mode.attr,
9d88883e 3147 &md_mismatches.attr,
88202a0c
N		 3148 &md_sync_min.attr,
3149 &md_sync_max.attr,
3150 &md_sync_speed.attr,
3151 &md_sync_completed.attr,
c6207277 3152 &md_max_sync.attr,
e464eafd
N		 3153 &md_suspend_lo.attr,
3154 &md_suspend_hi.attr,
9b1d1dac 3155 &md_bitmap.attr,
d7f3d291 3156 &md_degraded.attr,
eae1701f
N		 3157 NULL,
3158};
411036fa
N		 3159static struct attribute_group md_redundancy_group = {
3160 .name = NULL,
3161 .attrs = md_redundancy_attrs,
3162};
3163
eae1701f
N		 3164
3165static ssize_t
3166md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3167{
3168 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3169 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 3170 ssize_t rv;
eae1701f
N		 3171
3172 if (!entry->show)
3173 return -EIO;
5dc5cf7d
IM		 3174 rv = mddev_lock(mddev);
3175 if (!rv) {
3176 rv = entry->show(mddev, page);
3177 mddev_unlock(mddev);
3178 }
96de1e66 3179 return rv;
eae1701f
N		 3180}
3181
3182static ssize_t
3183md_attr_store(struct kobject *kobj, struct attribute *attr,
3184 const char *page, size_t length)
3185{
3186 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3187 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 3188 ssize_t rv;
eae1701f
N		 3189
3190 if (!entry->store)
3191 return -EIO;
67463acb
N		 3192 if (!capable(CAP_SYS_ADMIN))
3193 return -EACCES;
5dc5cf7d
IM		 3194 rv = mddev_lock(mddev);
3195 if (!rv) {
3196 rv = entry->store(mddev, page, length);
3197 mddev_unlock(mddev);
3198 }
96de1e66 3199 return rv;
eae1701f
N		 3200}
3201
3202static void md_free(struct kobject *ko)
3203{
3204 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3205 kfree(mddev);
3206}
3207
3208static struct sysfs_ops md_sysfs_ops = {
3209 .show = md_attr_show,
3210 .store = md_attr_store,
3211};
3212static struct kobj_type md_ktype = {
3213 .release = md_free,
3214 .sysfs_ops = &md_sysfs_ops,
3215 .default_attrs = md_default_attrs,
3216};
3217
1da177e4
LT		 3218int mdp_major = 0;
3219
3220static struct kobject *md_probe(dev_t dev, int *part, void *data)
3221{
48c9c27b 3222 static DEFINE_MUTEX(disks_mutex);
1da177e4
LT		 3223 mddev_t *mddev = mddev_find(dev);
3224 struct gendisk *disk;
3225 int partitioned = (MAJOR(dev) != MD_MAJOR);
3226 int shift = partitioned ? MdpMinorShift : 0;
3227 int unit = MINOR(dev) >> shift;
3830c62f 3228 int error;
1da177e4
LT		 3229
3230 if (!mddev)
3231 return NULL;
3232
48c9c27b 3233 mutex_lock(&disks_mutex);
1da177e4 3234 if (mddev->gendisk) {
48c9c27b 3235 mutex_unlock(&disks_mutex);
1da177e4
LT		 3236 mddev_put(mddev);
3237 return NULL;
3238 }
3239 disk = alloc_disk(1 << shift);
3240 if (!disk) {
48c9c27b 3241 mutex_unlock(&disks_mutex);
1da177e4
LT		 3242 mddev_put(mddev);
3243 return NULL;
3244 }
3245 disk->major = MAJOR(dev);
3246 disk->first_minor = unit << shift;
ce7b0f46 3247 if (partitioned)
1da177e4 3248 sprintf(disk->disk_name, "md_d%d", unit);
ce7b0f46 3249 else
1da177e4 3250 sprintf(disk->disk_name, "md%d", unit);
1da177e4
LT		 3251 disk->fops = &md_fops;
3252 disk->private_data = mddev;
3253 disk->queue = mddev->queue;
3254 add_disk(disk);
3255 mddev->gendisk = disk;
48c9c27b 3256 mutex_unlock(&disks_mutex);
edfaa7c3 3257 error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj,
3830c62f
GKH		 3258 "%s", "md");
3259 if (error)
5e55e2f5
N		 3260 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3261 disk->disk_name);
3830c62f
GKH		 3262 else
3263 kobject_uevent(&mddev->kobj, KOBJ_ADD);
1da177e4
LT		 3264 return NULL;
3265}
3266
1da177e4
LT		 3267static void md_safemode_timeout(unsigned long data)
3268{
3269 mddev_t *mddev = (mddev_t *) data;
3270
3271 mddev->safemode = 1;
3272 md_wakeup_thread(mddev->thread);
3273}
3274
6ff8d8ec 3275static int start_dirty_degraded;
1da177e4
LT		 3276
3277static int do_md_run(mddev_t * mddev)
3278{
2604b703 3279 int err;
1da177e4
LT		 3280 int chunk_size;
3281 struct list_head *tmp;
3282 mdk_rdev_t *rdev;
3283 struct gendisk *disk;
2604b703 3284 struct mdk_personality *pers;
1da177e4
LT		 3285 char b[BDEVNAME_SIZE];
3286
a757e64c
N		 3287 if (list_empty(&mddev->disks))
3288 /* cannot run an array with no devices.. */
1da177e4 3289 return -EINVAL;
1da177e4
LT		 3290
3291 if (mddev->pers)
3292 return -EBUSY;
3293
3294 /*
3295 * Analyze all RAID superblock(s)
3296 */
1ec4a939
N		 3297 if (!mddev->raid_disks) {
3298 if (!mddev->persistent)
3299 return -EINVAL;
a757e64c 3300 analyze_sbs(mddev);
1ec4a939 3301 }
1da177e4
LT		 3302
3303 chunk_size = mddev->chunk_size;
2604b703
N		 3304
3305 if (chunk_size) {
1da177e4
LT		 3306 if (chunk_size > MAX_CHUNK_SIZE) {
3307 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3308 chunk_size, MAX_CHUNK_SIZE);
3309 return -EINVAL;
3310 }
3311 /*
3312 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3313 */
3314 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 3315 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 3316 return -EINVAL;
3317 }
3318 if (chunk_size < PAGE_SIZE) {
3319 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
3320 chunk_size, PAGE_SIZE);
3321 return -EINVAL;
3322 }
3323
3324 /* devices must have minimum size of one chunk */
d089c6af 3325 rdev_for_each(rdev, tmp, mddev) {
b2d444d7 3326 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3327 continue;
3328 if (rdev->size < chunk_size / 1024) {
3329 printk(KERN_WARNING
3330 "md: Dev %s smaller than chunk_size:"
3331 " %lluk < %dk\n",
3332 bdevname(rdev->bdev,b),
3333 (unsigned long long)rdev->size,
3334 chunk_size / 1024);
3335 return -EINVAL;
3336 }
3337 }
3338 }
3339
1da177e4 3340#ifdef CONFIG_KMOD
d9d166c2
N		 3341 if (mddev->level != LEVEL_NONE)
3342 request_module("md-level-%d", mddev->level);
3343 else if (mddev->clevel[0])
3344 request_module("md-%s", mddev->clevel);
1da177e4
LT		 3345#endif
3346
3347 /*
3348 * Drop all container device buffers, from now on
3349 * the only valid external interface is through the md
3350 * device.
1da177e4 3351 */
d089c6af 3352 rdev_for_each(rdev, tmp, mddev) {
b2d444d7 3353 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3354 continue;
3355 sync_blockdev(rdev->bdev);
f98393a6 3356 invalidate_bdev(rdev->bdev);
f0d76d70
N		 3357
3358 /* perform some consistency tests on the device.
3359 * We don't want the data to overlap the metadata,
3360 * Internal Bitmap issues has handled elsewhere.
3361 */
3362 if (rdev->data_offset < rdev->sb_offset) {
3363 if (mddev->size &&
3364 rdev->data_offset + mddev->size*2
3365 > rdev->sb_offset*2) {
3366 printk("md: %s: data overlaps metadata\n",
3367 mdname(mddev));
3368 return -EINVAL;
3369 }
3370 } else {
3371 if (rdev->sb_offset*2 + rdev->sb_size/512
3372 > rdev->data_offset) {
3373 printk("md: %s: metadata overlaps data\n",
3374 mdname(mddev));
3375 return -EINVAL;
3376 }
3377 }
1da177e4
LT		 3378 }
3379
3380 md_probe(mddev->unit, NULL, NULL);
3381 disk = mddev->gendisk;
3382 if (!disk)
3383 return -ENOMEM;
3384
3385 spin_lock(&pers_lock);
d9d166c2 3386 pers = find_pers(mddev->level, mddev->clevel);
2604b703 3387 if (!pers || !try_module_get(pers->owner)) {
1da177e4 3388 spin_unlock(&pers_lock);
d9d166c2
N		 3389 if (mddev->level != LEVEL_NONE)
3390 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3391 mddev->level);
3392 else
3393 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3394 mddev->clevel);
1da177e4
LT		 3395 return -EINVAL;
3396 }
2604b703 3397 mddev->pers = pers;
1da177e4 3398 spin_unlock(&pers_lock);
d9d166c2
N		 3399 mddev->level = pers->level;
3400 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
1da177e4 3401
f6705578 3402 if (mddev->reshape_position != MaxSector &&
63c70c4f 3403 pers->start_reshape == NULL) {
f6705578
N		 3404 /* This personality cannot handle reshaping... */
3405 mddev->pers = NULL;
3406 module_put(pers->owner);
3407 return -EINVAL;
3408 }
3409
7dd5e7c3
N		 3410 if (pers->sync_request) {
3411 /* Warn if this is a potentially silly
3412 * configuration.
3413 */
3414 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3415 mdk_rdev_t *rdev2;
3416 struct list_head *tmp2;
3417 int warned = 0;
d089c6af
N		 3418 rdev_for_each(rdev, tmp, mddev) {
3419 rdev_for_each(rdev2, tmp2, mddev) {
7dd5e7c3
N		 3420 if (rdev < rdev2 &&
3421 rdev->bdev->bd_contains ==
3422 rdev2->bdev->bd_contains) {
3423 printk(KERN_WARNING
3424 "%s: WARNING: %s appears to be"
3425 " on the same physical disk as"
3426 " %s.\n",
3427 mdname(mddev),
3428 bdevname(rdev->bdev,b),
3429 bdevname(rdev2->bdev,b2));
3430 warned = 1;
3431 }
3432 }
3433 }
3434 if (warned)
3435 printk(KERN_WARNING
3436 "True protection against single-disk"
3437 " failure might be compromised.\n");
3438 }
3439
657390d2 3440 mddev->recovery = 0;
1da177e4 3441 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 3442 mddev->barriers_work = 1;
6ff8d8ec 3443 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 3444
f91de92e
N		 3445 if (start_readonly)
3446 mddev->ro = 2; /* read-only, but switch on first write */
3447
b15c2e57
N		 3448 err = mddev->pers->run(mddev);
3449 if (!err && mddev->pers->sync_request) {
3450 err = bitmap_create(mddev);
3451 if (err) {
3452 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3453 mdname(mddev), err);
3454 mddev->pers->stop(mddev);
3455 }
3456 }
1da177e4
LT		 3457 if (err) {
3458 printk(KERN_ERR "md: pers->run() failed ...\n");
3459 module_put(mddev->pers->owner);
3460 mddev->pers = NULL;
32a7627c
N		 3461 bitmap_destroy(mddev);
3462 return err;
1da177e4 3463 }
5e55e2f5
N		 3464 if (mddev->pers->sync_request) {
3465 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3466 printk(KERN_WARNING
3467 "md: cannot register extra attributes for %s\n",
3468 mdname(mddev));
3469 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
fd9d49ca
N		 3470 mddev->ro = 0;
3471
1da177e4
LT		 3472 atomic_set(&mddev->writes_pending,0);
3473 mddev->safemode = 0;
3474 mddev->safemode_timer.function = md_safemode_timeout;
3475 mddev->safemode_timer.data = (unsigned long) mddev;
16f17b39 3476 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
1da177e4 3477 mddev->in_sync = 1;
86e6ffdd 3478
d089c6af 3479 rdev_for_each(rdev, tmp, mddev)
86e6ffdd
N		 3480 if (rdev->raid_disk >= 0) {
3481 char nm[20];
3482 sprintf(nm, "rd%d", rdev->raid_disk);
5e55e2f5
N		 3483 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3484 printk("md: cannot register %s for %s\n",
3485 nm, mdname(mddev));
86e6ffdd 3486 }
1da177e4
LT		 3487
3488 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3489
850b2b42
N		 3490 if (mddev->flags)
3491 md_update_sb(mddev, 0);
1da177e4
LT		 3492
3493 set_capacity(disk, mddev->array_size<<1);
3494
3495 /* If we call blk_queue_make_request here, it will
3496 * re-initialise max_sectors etc which may have been
3497 * refined inside -> run. So just set the bits we need to set.
3498 * Most initialisation happended when we called
3499 * blk_queue_make_request(..., md_fail_request)
3500 * earlier.
3501 */
3502 mddev->queue->queuedata = mddev;
3503 mddev->queue->make_request_fn = mddev->pers->make_request;
3504
5fd6c1dc
N		 3505 /* If there is a partially-recovered drive we need to
3506 * start recovery here. If we leave it to md_check_recovery,
3507 * it will remove the drives and not do the right thing
3508 */
0b8c9de0 3509 if (mddev->degraded && !mddev->sync_thread) {
5fd6c1dc
N		 3510 struct list_head *rtmp;
3511 int spares = 0;
d089c6af 3512 rdev_for_each(rdev, rtmp, mddev)
5fd6c1dc
N		 3513 if (rdev->raid_disk >= 0 &&
3514 !test_bit(In_sync, &rdev->flags) &&
3515 !test_bit(Faulty, &rdev->flags))
3516 /* complete an interrupted recovery */
3517 spares++;
3518 if (spares && mddev->pers->sync_request) {
3519 mddev->recovery = 0;
3520 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3521 mddev->sync_thread = md_register_thread(md_do_sync,
3522 mddev,
3523 "%s_resync");
3524 if (!mddev->sync_thread) {
3525 printk(KERN_ERR "%s: could not start resync"
3526 " thread...\n",
3527 mdname(mddev));
3528 /* leave the spares where they are, it shouldn't hurt */
3529 mddev->recovery = 0;
0b8c9de0 3530 }
5fd6c1dc
N		 3531 }
3532 }
0b8c9de0
N		 3533 md_wakeup_thread(mddev->thread);
3534 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5fd6c1dc 3535
44ce6294 3536 mddev->changed = 1;
d7603b7e 3537 md_new_event(mddev);
edfaa7c3 3538 kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE);
1da177e4
LT		 3539 return 0;
3540}
3541
3542static int restart_array(mddev_t *mddev)
3543{
3544 struct gendisk *disk = mddev->gendisk;
3545 int err;
3546
3547 /*
3548 * Complain if it has no devices
3549 */
3550 err = -ENXIO;
3551 if (list_empty(&mddev->disks))
3552 goto out;
3553
3554 if (mddev->pers) {
3555 err = -EBUSY;
3556 if (!mddev->ro)
3557 goto out;
3558
3559 mddev->safemode = 0;
3560 mddev->ro = 0;
3561 set_disk_ro(disk, 0);
3562
3563 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3564 mdname(mddev));
3565 /*
3566 * Kick recovery or resync if necessary
3567 */
3568 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3569 md_wakeup_thread(mddev->thread);
5fd6c1dc 3570 md_wakeup_thread(mddev->sync_thread);
1da177e4 3571 err = 0;
9e653b63 3572 } else
1da177e4 3573 err = -EINVAL;
1da177e4
LT		 3574
3575out:
3576 return err;
3577}
3578
acc55e22
N		 3579/* similar to deny_write_access, but accounts for our holding a reference
3580 * to the file ourselves */
3581static int deny_bitmap_write_access(struct file * file)
3582{
3583 struct inode *inode = file->f_mapping->host;
3584
3585 spin_lock(&inode->i_lock);
3586 if (atomic_read(&inode->i_writecount) > 1) {
3587 spin_unlock(&inode->i_lock);
3588 return -ETXTBSY;
3589 }
3590 atomic_set(&inode->i_writecount, -1);
3591 spin_unlock(&inode->i_lock);
3592
3593 return 0;
3594}
3595
3596static void restore_bitmap_write_access(struct file *file)
3597{
3598 struct inode *inode = file->f_mapping->host;
3599
3600 spin_lock(&inode->i_lock);
3601 atomic_set(&inode->i_writecount, 1);
3602 spin_unlock(&inode->i_lock);
3603}
3604
9e653b63
N		 3605/* mode:
3606 * 0 - completely stop and dis-assemble array
3607 * 1 - switch to readonly
3608 * 2 - stop but do not disassemble array
3609 */
3610static int do_md_stop(mddev_t * mddev, int mode)
1da177e4
LT		 3611{
3612 int err = 0;
3613 struct gendisk *disk = mddev->gendisk;
3614
3615 if (mddev->pers) {
3616 if (atomic_read(&mddev->active)>2) {
3617 printk("md: %s still in use.\n",mdname(mddev));
3618 return -EBUSY;
3619 }
3620
3621 if (mddev->sync_thread) {
5fd6c1dc 3622 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4
LT		 3623 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3624 md_unregister_thread(mddev->sync_thread);
3625 mddev->sync_thread = NULL;
3626 }
3627
3628 del_timer_sync(&mddev->safemode_timer);
3629
3630 invalidate_partition(disk, 0);
3631
9e653b63
N		 3632 switch(mode) {
3633 case 1: /* readonly */
1da177e4 3634 err = -ENXIO;
f91de92e 3635 if (mddev->ro==1)
1da177e4
LT		 3636 goto out;
3637 mddev->ro = 1;
9e653b63
N		 3638 break;
3639 case 0: /* disassemble */
3640 case 2: /* stop */
6b8b3e8a 3641 bitmap_flush(mddev);
a9701a30 3642 md_super_wait(mddev);
1da177e4
LT		 3643 if (mddev->ro)
3644 set_disk_ro(disk, 0);
3645 blk_queue_make_request(mddev->queue, md_fail_request);
3646 mddev->pers->stop(mddev);
d1b5380c
N		 3647 mddev->queue->merge_bvec_fn = NULL;
3648 mddev->queue->unplug_fn = NULL;
041ae52e 3649 mddev->queue->backing_dev_info.congested_fn = NULL;
411036fa
N		 3650 if (mddev->pers->sync_request)
3651 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3652
1da177e4
LT		 3653 module_put(mddev->pers->owner);
3654 mddev->pers = NULL;
0d4ca600
N		 3655
3656 set_capacity(disk, 0);
44ce6294 3657 mddev->changed = 1;
0d4ca600 3658
1da177e4
LT		 3659 if (mddev->ro)
3660 mddev->ro = 0;
3661 }
850b2b42 3662 if (!mddev->in_sync || mddev->flags) {
1da177e4
LT		 3663 /* mark array as shutdown cleanly */
3664 mddev->in_sync = 1;
850b2b42 3665 md_update_sb(mddev, 1);
1da177e4 3666 }
9e653b63 3667 if (mode == 1)
1da177e4 3668 set_disk_ro(disk, 1);
5fd6c1dc 3669 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4 3670 }
32a7627c 3671
1da177e4
LT		 3672 /*
3673 * Free resources if final stop
3674 */
9e653b63 3675 if (mode == 0) {
86e6ffdd
N		 3676 mdk_rdev_t *rdev;
3677 struct list_head *tmp;
0d4ca600 3678
1da177e4
LT		 3679 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3680
978f946b
N		 3681 bitmap_destroy(mddev);
3682 if (mddev->bitmap_file) {
acc55e22 3683 restore_bitmap_write_access(mddev->bitmap_file);
978f946b
N		 3684 fput(mddev->bitmap_file);
3685 mddev->bitmap_file = NULL;
3686 }
3687 mddev->bitmap_offset = 0;
3688
d089c6af 3689 rdev_for_each(rdev, tmp, mddev)
86e6ffdd
N		 3690 if (rdev->raid_disk >= 0) {
3691 char nm[20];
3692 sprintf(nm, "rd%d", rdev->raid_disk);
3693 sysfs_remove_link(&mddev->kobj, nm);
3694 }
3695
177a99b2 3696 /* make sure all md_delayed_delete calls have finished */
5792a285
N		 3697 flush_scheduled_work();
3698
1da177e4
LT		 3699 export_array(mddev);
3700
3701 mddev->array_size = 0;
9e653b63
N		 3702 mddev->size = 0;
3703 mddev->raid_disks = 0;
a94213b1 3704 mddev->recovery_cp = 0;
c6207277 3705 mddev->resync_max = MaxSector;
08a02ecd 3706 mddev->reshape_position = MaxSector;
e691063a 3707 mddev->external = 0;
1ec4a939 3708 mddev->persistent = 0;
9e653b63 3709
a8a55c38 3710 } else if (mddev->pers)
1da177e4
LT		 3711 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3712 mdname(mddev));
3713 err = 0;
d7603b7e 3714 md_new_event(mddev);
1da177e4
LT		 3715out:
3716 return err;
3717}
3718
fdee8ae4 3719#ifndef MODULE
1da177e4
LT		 3720static void autorun_array(mddev_t *mddev)
3721{
3722 mdk_rdev_t *rdev;
3723 struct list_head *tmp;
3724 int err;
3725
a757e64c 3726 if (list_empty(&mddev->disks))
1da177e4 3727 return;
1da177e4
LT		 3728
3729 printk(KERN_INFO "md: running: ");
3730
d089c6af 3731 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 3732 char b[BDEVNAME_SIZE];
3733 printk("<%s>", bdevname(rdev->bdev,b));
3734 }
3735 printk("\n");
3736
3737 err = do_md_run (mddev);
3738 if (err) {
3739 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3740 do_md_stop (mddev, 0);
3741 }
3742}
3743
3744/*
3745 * lets try to run arrays based on all disks that have arrived
3746 * until now. (those are in pending_raid_disks)
3747 *
3748 * the method: pick the first pending disk, collect all disks with
3749 * the same UUID, remove all from the pending list and put them into
3750 * the 'same_array' list. Then order this list based on superblock
3751 * update time (freshest comes first), kick out 'old' disks and
3752 * compare superblocks. If everything's fine then run it.
3753 *
3754 * If "unit" is allocated, then bump its reference count
3755 */
3756static void autorun_devices(int part)
3757{
1da177e4
LT		 3758 struct list_head *tmp;
3759 mdk_rdev_t *rdev0, *rdev;
3760 mddev_t *mddev;
3761 char b[BDEVNAME_SIZE];
3762
3763 printk(KERN_INFO "md: autorun ...\n");
3764 while (!list_empty(&pending_raid_disks)) {
e8703fe1 3765 int unit;
1da177e4 3766 dev_t dev;
ad01c9e3 3767 LIST_HEAD(candidates);
1da177e4
LT		 3768 rdev0 = list_entry(pending_raid_disks.next,
3769 mdk_rdev_t, same_set);
3770
3771 printk(KERN_INFO "md: considering %s ...\n",
3772 bdevname(rdev0->bdev,b));
3773 INIT_LIST_HEAD(&candidates);
73c34431 3774 rdev_for_each_list(rdev, tmp, pending_raid_disks)
1da177e4
LT		 3775 if (super_90_load(rdev, rdev0, 0) >= 0) {
3776 printk(KERN_INFO "md: adding %s ...\n",
3777 bdevname(rdev->bdev,b));
3778 list_move(&rdev->same_set, &candidates);
3779 }
3780 /*
3781 * now we have a set of devices, with all of them having
3782 * mostly sane superblocks. It's time to allocate the
3783 * mddev.
3784 */
e8703fe1
N		 3785 if (part) {
3786 dev = MKDEV(mdp_major,
3787 rdev0->preferred_minor << MdpMinorShift);
3788 unit = MINOR(dev) >> MdpMinorShift;
3789 } else {
3790 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3791 unit = MINOR(dev);
3792 }
3793 if (rdev0->preferred_minor != unit) {
1da177e4
LT		 3794 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3795 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3796 break;
3797 }
1da177e4
LT		 3798
3799 md_probe(dev, NULL, NULL);
3800 mddev = mddev_find(dev);
3801 if (!mddev) {
3802 printk(KERN_ERR
3803 "md: cannot allocate memory for md drive.\n");
3804 break;
3805 }
3806 if (mddev_lock(mddev))
3807 printk(KERN_WARNING "md: %s locked, cannot run\n",
3808 mdname(mddev));
3809 else if (mddev->raid_disks || mddev->major_version
3810 || !list_empty(&mddev->disks)) {
3811 printk(KERN_WARNING
3812 "md: %s already running, cannot run %s\n",
3813 mdname(mddev), bdevname(rdev0->bdev,b));
3814 mddev_unlock(mddev);
3815 } else {
3816 printk(KERN_INFO "md: created %s\n", mdname(mddev));
1ec4a939 3817 mddev->persistent = 1;
73c34431 3818 rdev_for_each_list(rdev, tmp, candidates) {
1da177e4
LT		 3819 list_del_init(&rdev->same_set);
3820 if (bind_rdev_to_array(rdev, mddev))
3821 export_rdev(rdev);
3822 }
3823 autorun_array(mddev);
3824 mddev_unlock(mddev);
3825 }
3826 /* on success, candidates will be empty, on error
3827 * it won't...
3828 */
73c34431 3829 rdev_for_each_list(rdev, tmp, candidates)
1da177e4
LT		 3830 export_rdev(rdev);
3831 mddev_put(mddev);
3832 }
3833 printk(KERN_INFO "md: ... autorun DONE.\n");
3834}
fdee8ae4 3835#endif /* !MODULE */
1da177e4 3836
1da177e4
LT		 3837static int get_version(void __user * arg)
3838{
3839 mdu_version_t ver;
3840
3841 ver.major = MD_MAJOR_VERSION;
3842 ver.minor = MD_MINOR_VERSION;
3843 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3844
3845 if (copy_to_user(arg, &ver, sizeof(ver)))
3846 return -EFAULT;
3847
3848 return 0;
3849}
3850
3851static int get_array_info(mddev_t * mddev, void __user * arg)
3852{
3853 mdu_array_info_t info;
3854 int nr,working,active,failed,spare;
3855 mdk_rdev_t *rdev;
3856 struct list_head *tmp;
3857
3858 nr=working=active=failed=spare=0;
d089c6af 3859 rdev_for_each(rdev, tmp, mddev) {
1da177e4 3860 nr++;
b2d444d7 3861 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3862 failed++;
3863 else {
3864 working++;
b2d444d7 3865 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 3866 active++;
3867 else
3868 spare++;
3869 }
3870 }
3871
3872 info.major_version = mddev->major_version;
3873 info.minor_version = mddev->minor_version;
3874 info.patch_version = MD_PATCHLEVEL_VERSION;
3875 info.ctime = mddev->ctime;
3876 info.level = mddev->level;
3877 info.size = mddev->size;
284ae7ca
N		 3878 if (info.size != mddev->size) /* overflow */
3879 info.size = -1;
1da177e4
LT		 3880 info.nr_disks = nr;
3881 info.raid_disks = mddev->raid_disks;
3882 info.md_minor = mddev->md_minor;
3883 info.not_persistent= !mddev->persistent;
3884
3885 info.utime = mddev->utime;
3886 info.state = 0;
3887 if (mddev->in_sync)
3888 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 3889 if (mddev->bitmap && mddev->bitmap_offset)
3890 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 3891 info.active_disks = active;
3892 info.working_disks = working;
3893 info.failed_disks = failed;
3894 info.spare_disks = spare;
3895
3896 info.layout = mddev->layout;
3897 info.chunk_size = mddev->chunk_size;
3898
3899 if (copy_to_user(arg, &info, sizeof(info)))
3900 return -EFAULT;
3901
3902 return 0;
3903}
3904
87162a28 3905static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 3906{
3907 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3908 char *ptr, *buf = NULL;
3909 int err = -ENOMEM;
3910
2a2275d6
N		 3911 md_allow_write(mddev);
3912
32a7627c
N		 3913 file = kmalloc(sizeof(*file), GFP_KERNEL);
3914 if (!file)
3915 goto out;
3916
3917 /* bitmap disabled, zero the first byte and copy out */
3918 if (!mddev->bitmap || !mddev->bitmap->file) {
3919 file->pathname[0] = '\0';
3920 goto copy_out;
3921 }
3922
3923 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3924 if (!buf)
3925 goto out;
3926
3927 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3928 if (!ptr)
3929 goto out;
3930
3931 strcpy(file->pathname, ptr);
3932
3933copy_out:
3934 err = 0;
3935 if (copy_to_user(arg, file, sizeof(*file)))
3936 err = -EFAULT;
3937out:
3938 kfree(buf);
3939 kfree(file);
3940 return err;
3941}
3942
1da177e4
LT		 3943static int get_disk_info(mddev_t * mddev, void __user * arg)
3944{
3945 mdu_disk_info_t info;
3946 unsigned int nr;
3947 mdk_rdev_t *rdev;
3948
3949 if (copy_from_user(&info, arg, sizeof(info)))
3950 return -EFAULT;
3951
3952 nr = info.number;
3953
3954 rdev = find_rdev_nr(mddev, nr);
3955 if (rdev) {
3956 info.major = MAJOR(rdev->bdev->bd_dev);
3957 info.minor = MINOR(rdev->bdev->bd_dev);
3958 info.raid_disk = rdev->raid_disk;
3959 info.state = 0;
b2d444d7 3960 if (test_bit(Faulty, &rdev->flags))
1da177e4 3961 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 3962 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 3963 info.state |= (1<<MD_DISK_ACTIVE);
3964 info.state |= (1<<MD_DISK_SYNC);
3965 }
8ddf9efe
N		 3966 if (test_bit(WriteMostly, &rdev->flags))
3967 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 3968 } else {
3969 info.major = info.minor = 0;
3970 info.raid_disk = -1;
3971 info.state = (1<<MD_DISK_REMOVED);
3972 }
3973
3974 if (copy_to_user(arg, &info, sizeof(info)))
3975 return -EFAULT;
3976
3977 return 0;
3978}
3979
3980static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3981{
3982 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3983 mdk_rdev_t *rdev;
3984 dev_t dev = MKDEV(info->major,info->minor);
3985
3986 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3987 return -EOVERFLOW;
3988
3989 if (!mddev->raid_disks) {
3990 int err;
3991 /* expecting a device which has a superblock */
3992 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3993 if (IS_ERR(rdev)) {
3994 printk(KERN_WARNING
3995 "md: md_import_device returned %ld\n",
3996 PTR_ERR(rdev));
3997 return PTR_ERR(rdev);
3998 }
3999 if (!list_empty(&mddev->disks)) {
4000 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4001 mdk_rdev_t, same_set);
4002 int err = super_types[mddev->major_version]
4003 .load_super(rdev, rdev0, mddev->minor_version);
4004 if (err < 0) {
4005 printk(KERN_WARNING
4006 "md: %s has different UUID to %s\n",
4007 bdevname(rdev->bdev,b),
4008 bdevname(rdev0->bdev,b2));
4009 export_rdev(rdev);
4010 return -EINVAL;
4011 }
4012 }
4013 err = bind_rdev_to_array(rdev, mddev);
4014 if (err)
4015 export_rdev(rdev);
4016 return err;
4017 }
4018
4019 /*
4020 * add_new_disk can be used once the array is assembled
4021 * to add "hot spares". They must already have a superblock
4022 * written
4023 */
4024 if (mddev->pers) {
4025 int err;
4026 if (!mddev->pers->hot_add_disk) {
4027 printk(KERN_WARNING
4028 "%s: personality does not support diskops!\n",
4029 mdname(mddev));
4030 return -EINVAL;
4031 }
7b1e35f6
N		 4032 if (mddev->persistent)
4033 rdev = md_import_device(dev, mddev->major_version,
4034 mddev->minor_version);
4035 else
4036 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 4037 if (IS_ERR(rdev)) {
4038 printk(KERN_WARNING
4039 "md: md_import_device returned %ld\n",
4040 PTR_ERR(rdev));
4041 return PTR_ERR(rdev);
4042 }
41158c7e
N		 4043 /* set save_raid_disk if appropriate */
4044 if (!mddev->persistent) {
4045 if (info->state & (1<<MD_DISK_SYNC) &&
4046 info->raid_disk < mddev->raid_disks)
4047 rdev->raid_disk = info->raid_disk;
4048 else
4049 rdev->raid_disk = -1;
4050 } else
4051 super_types[mddev->major_version].
4052 validate_super(mddev, rdev);
4053 rdev->saved_raid_disk = rdev->raid_disk;
4054
b2d444d7 4055 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 4056 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4057 set_bit(WriteMostly, &rdev->flags);
4058
1da177e4
LT		 4059 rdev->raid_disk = -1;
4060 err = bind_rdev_to_array(rdev, mddev);
7c7546cc
N		 4061 if (!err && !mddev->pers->hot_remove_disk) {
4062 /* If there is hot_add_disk but no hot_remove_disk
4063 * then added disks for geometry changes,
4064 * and should be added immediately.
4065 */
4066 super_types[mddev->major_version].
4067 validate_super(mddev, rdev);
4068 err = mddev->pers->hot_add_disk(mddev, rdev);
4069 if (err)
4070 unbind_rdev_from_array(rdev);
4071 }
1da177e4
LT		 4072 if (err)
4073 export_rdev(rdev);
c361777f 4074
17571284 4075 md_update_sb(mddev, 1);
c361777f 4076 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 4077 md_wakeup_thread(mddev->thread);
1da177e4
LT		 4078 return err;
4079 }
4080
4081 /* otherwise, add_new_disk is only allowed
4082 * for major_version==0 superblocks
4083 */
4084 if (mddev->major_version != 0) {
4085 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4086 mdname(mddev));
4087 return -EINVAL;
4088 }
4089
4090 if (!(info->state & (1<<MD_DISK_FAULTY))) {
4091 int err;
4092 rdev = md_import_device (dev, -1, 0);
4093 if (IS_ERR(rdev)) {
4094 printk(KERN_WARNING
4095 "md: error, md_import_device() returned %ld\n",
4096 PTR_ERR(rdev));
4097 return PTR_ERR(rdev);
4098 }
4099 rdev->desc_nr = info->number;
4100 if (info->raid_disk < mddev->raid_disks)
4101 rdev->raid_disk = info->raid_disk;
4102 else
4103 rdev->raid_disk = -1;
4104
1da177e4 4105 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 4106 if (info->state & (1<<MD_DISK_SYNC))
4107 set_bit(In_sync, &rdev->flags);
1da177e4 4108
8ddf9efe
N		 4109 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4110 set_bit(WriteMostly, &rdev->flags);
4111
1da177e4
LT		 4112 if (!mddev->persistent) {
4113 printk(KERN_INFO "md: nonpersistent superblock ...\n");
4114 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4115 } else
4116 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
4117 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
4118
2bf071bf
N		 4119 err = bind_rdev_to_array(rdev, mddev);
4120 if (err) {
4121 export_rdev(rdev);
4122 return err;
4123 }
1da177e4
LT		 4124 }
4125
4126 return 0;
4127}
4128
4129static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4130{
4131 char b[BDEVNAME_SIZE];
4132 mdk_rdev_t *rdev;
4133
4134 if (!mddev->pers)
4135 return -ENODEV;
4136
4137 rdev = find_rdev(mddev, dev);
4138 if (!rdev)
4139 return -ENXIO;
4140
4141 if (rdev->raid_disk >= 0)
4142 goto busy;
4143
4144 kick_rdev_from_array(rdev);
850b2b42 4145 md_update_sb(mddev, 1);
d7603b7e 4146 md_new_event(mddev);
1da177e4
LT		 4147
4148 return 0;
4149busy:
4150 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
4151 bdevname(rdev->bdev,b), mdname(mddev));
4152 return -EBUSY;
4153}
4154
4155static int hot_add_disk(mddev_t * mddev, dev_t dev)
4156{
4157 char b[BDEVNAME_SIZE];
4158 int err;
4159 unsigned int size;
4160 mdk_rdev_t *rdev;
4161
4162 if (!mddev->pers)
4163 return -ENODEV;
4164
4165 if (mddev->major_version != 0) {
4166 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4167 " version-0 superblocks.\n",
4168 mdname(mddev));
4169 return -EINVAL;
4170 }
4171 if (!mddev->pers->hot_add_disk) {
4172 printk(KERN_WARNING
4173 "%s: personality does not support diskops!\n",
4174 mdname(mddev));
4175 return -EINVAL;
4176 }
4177
4178 rdev = md_import_device (dev, -1, 0);
4179 if (IS_ERR(rdev)) {
4180 printk(KERN_WARNING
4181 "md: error, md_import_device() returned %ld\n",
4182 PTR_ERR(rdev));
4183 return -EINVAL;
4184 }
4185
4186 if (mddev->persistent)
4187 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
4188 else
4189 rdev->sb_offset =
4190 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4191
4192 size = calc_dev_size(rdev, mddev->chunk_size);
4193 rdev->size = size;
4194
b2d444d7 4195 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4196 printk(KERN_WARNING
4197 "md: can not hot-add faulty %s disk to %s!\n",
4198 bdevname(rdev->bdev,b), mdname(mddev));
4199 err = -EINVAL;
4200 goto abort_export;
4201 }
b2d444d7 4202 clear_bit(In_sync, &rdev->flags);
1da177e4 4203 rdev->desc_nr = -1;
5842730d 4204 rdev->saved_raid_disk = -1;
2bf071bf
N		 4205 err = bind_rdev_to_array(rdev, mddev);
4206 if (err)
4207 goto abort_export;
1da177e4
LT		 4208
4209 /*
4210 * The rest should better be atomic, we can have disk failures
4211 * noticed in interrupt contexts ...
4212 */
4213
4214 if (rdev->desc_nr == mddev->max_disks) {
4215 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
4216 mdname(mddev));
4217 err = -EBUSY;
4218 goto abort_unbind_export;
4219 }
4220
4221 rdev->raid_disk = -1;
4222
850b2b42 4223 md_update_sb(mddev, 1);
1da177e4
LT		 4224
4225 /*
4226 * Kick recovery, maybe this spare has to be added to the
4227 * array immediately.
4228 */
4229 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4230 md_wakeup_thread(mddev->thread);
d7603b7e 4231 md_new_event(mddev);
1da177e4
LT		 4232 return 0;
4233
4234abort_unbind_export:
4235 unbind_rdev_from_array(rdev);
4236
4237abort_export:
4238 export_rdev(rdev);
4239 return err;
4240}
4241
32a7627c
N		 4242static int set_bitmap_file(mddev_t *mddev, int fd)
4243{
4244 int err;
4245
36fa3063
N		 4246 if (mddev->pers) {
4247 if (!mddev->pers->quiesce)
4248 return -EBUSY;
4249 if (mddev->recovery || mddev->sync_thread)
4250 return -EBUSY;
4251 /* we should be able to change the bitmap.. */
4252 }
32a7627c 4253
32a7627c 4254
36fa3063
N		 4255 if (fd >= 0) {
4256 if (mddev->bitmap)
4257 return -EEXIST; /* cannot add when bitmap is present */
4258 mddev->bitmap_file = fget(fd);
32a7627c 4259
36fa3063
N		 4260 if (mddev->bitmap_file == NULL) {
4261 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4262 mdname(mddev));
4263 return -EBADF;
4264 }
4265
4266 err = deny_bitmap_write_access(mddev->bitmap_file);
4267 if (err) {
4268 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4269 mdname(mddev));
4270 fput(mddev->bitmap_file);
4271 mddev->bitmap_file = NULL;
4272 return err;
4273 }
a654b9d8 4274 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 4275 } else if (mddev->bitmap == NULL)
4276 return -ENOENT; /* cannot remove what isn't there */
4277 err = 0;
4278 if (mddev->pers) {
4279 mddev->pers->quiesce(mddev, 1);
4280 if (fd >= 0)
4281 err = bitmap_create(mddev);
d7375ab3 4282 if (fd < 0 || err) {
36fa3063 4283 bitmap_destroy(mddev);
d7375ab3
N		 4284 fd = -1; /* make sure to put the file */
4285 }
36fa3063 4286 mddev->pers->quiesce(mddev, 0);
d7375ab3
N		 4287 }
4288 if (fd < 0) {
acc55e22
N		 4289 if (mddev->bitmap_file) {
4290 restore_bitmap_write_access(mddev->bitmap_file);
36fa3063 4291 fput(mddev->bitmap_file);
acc55e22 4292 }
36fa3063
N		 4293 mddev->bitmap_file = NULL;
4294 }
4295
32a7627c
N		 4296 return err;
4297}
4298
1da177e4
LT		 4299/*
4300 * set_array_info is used two different ways
4301 * The original usage is when creating a new array.
4302 * In this usage, raid_disks is > 0 and it together with
4303 * level, size, not_persistent,layout,chunksize determine the
4304 * shape of the array.
4305 * This will always create an array with a type-0.90.0 superblock.
4306 * The newer usage is when assembling an array.
4307 * In this case raid_disks will be 0, and the major_version field is
4308 * use to determine which style super-blocks are to be found on the devices.
4309 * The minor and patch _version numbers are also kept incase the
4310 * super_block handler wishes to interpret them.
4311 */
4312static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4313{
4314
4315 if (info->raid_disks == 0) {
4316 /* just setting version number for superblock loading */
4317 if (info->major_version < 0 ||
50511da3 4318 info->major_version >= ARRAY_SIZE(super_types) ||
1da177e4
LT		 4319 super_types[info->major_version].name == NULL) {
4320 /* maybe try to auto-load a module? */
4321 printk(KERN_INFO
4322 "md: superblock version %d not known\n",
4323 info->major_version);
4324 return -EINVAL;
4325 }
4326 mddev->major_version = info->major_version;
4327 mddev->minor_version = info->minor_version;
4328 mddev->patch_version = info->patch_version;
3f9d7b0d 4329 mddev->persistent = !info->not_persistent;
1da177e4
LT		 4330 return 0;
4331 }
4332 mddev->major_version = MD_MAJOR_VERSION;
4333 mddev->minor_version = MD_MINOR_VERSION;
4334 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4335 mddev->ctime = get_seconds();
4336
4337 mddev->level = info->level;
17115e03 4338 mddev->clevel[0] = 0;
1da177e4
LT		 4339 mddev->size = info->size;
4340 mddev->raid_disks = info->raid_disks;
4341 /* don't set md_minor, it is determined by which /dev/md* was
4342 * openned
4343 */
4344 if (info->state & (1<<MD_SB_CLEAN))
4345 mddev->recovery_cp = MaxSector;
4346 else
4347 mddev->recovery_cp = 0;
4348 mddev->persistent = ! info->not_persistent;
e691063a 4349 mddev->external = 0;
1da177e4
LT		 4350
4351 mddev->layout = info->layout;
4352 mddev->chunk_size = info->chunk_size;
4353
4354 mddev->max_disks = MD_SB_DISKS;
4355
e691063a
N		 4356 if (mddev->persistent)
4357 mddev->flags = 0;
850b2b42 4358 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 4359
b2a2703c
N		 4360 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4361 mddev->bitmap_offset = 0;
4362
f6705578
N		 4363 mddev->reshape_position = MaxSector;
4364
1da177e4
LT		 4365 /*
4366 * Generate a 128 bit UUID
4367 */
4368 get_random_bytes(mddev->uuid, 16);
4369
f6705578
N		 4370 mddev->new_level = mddev->level;
4371 mddev->new_chunk = mddev->chunk_size;
4372 mddev->new_layout = mddev->layout;
4373 mddev->delta_disks = 0;
4374
1da177e4
LT		 4375 return 0;
4376}
4377
a35b0d69
N		 4378static int update_size(mddev_t *mddev, unsigned long size)
4379{
4380 mdk_rdev_t * rdev;
4381 int rv;
4382 struct list_head *tmp;
8ddeeae5 4383 int fit = (size == 0);
a35b0d69
N		 4384
4385 if (mddev->pers->resize == NULL)
4386 return -EINVAL;
4387 /* The "size" is the amount of each device that is used.
4388 * This can only make sense for arrays with redundancy.
4389 * linear and raid0 always use whatever space is available
4390 * We can only consider changing the size if no resync
4391 * or reconstruction is happening, and if the new size
4392 * is acceptable. It must fit before the sb_offset or,
4393 * if that is <data_offset, it must fit before the
4394 * size of each device.
4395 * If size is zero, we find the largest size that fits.
4396 */
4397 if (mddev->sync_thread)
4398 return -EBUSY;
d089c6af 4399 rdev_for_each(rdev, tmp, mddev) {
a35b0d69 4400 sector_t avail;
01ab5662
N		 4401 avail = rdev->size * 2;
4402
a35b0d69
N		 4403 if (fit && (size == 0 || size > avail/2))
4404 size = avail/2;
4405 if (avail < ((sector_t)size << 1))
4406 return -ENOSPC;
4407 }
4408 rv = mddev->pers->resize(mddev, (sector_t)size *2);
4409 if (!rv) {
4410 struct block_device *bdev;
4411
4412 bdev = bdget_disk(mddev->gendisk, 0);
4413 if (bdev) {
1b1dcc1b 4414 mutex_lock(&bdev->bd_inode->i_mutex);
6d89332b 4415 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
1b1dcc1b 4416 mutex_unlock(&bdev->bd_inode->i_mutex);
a35b0d69
N		 4417 bdput(bdev);
4418 }
4419 }
4420 return rv;
4421}
4422
da943b99
N		 4423static int update_raid_disks(mddev_t *mddev, int raid_disks)
4424{
4425 int rv;
4426 /* change the number of raid disks */
63c70c4f 4427 if (mddev->pers->check_reshape == NULL)
da943b99
N		 4428 return -EINVAL;
4429 if (raid_disks <= 0 ||
4430 raid_disks >= mddev->max_disks)
4431 return -EINVAL;
63c70c4f 4432 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
da943b99 4433 return -EBUSY;
63c70c4f
N		 4434 mddev->delta_disks = raid_disks - mddev->raid_disks;
4435
4436 rv = mddev->pers->check_reshape(mddev);
da943b99
N		 4437 return rv;
4438}
4439
4440
1da177e4
LT		 4441/*
4442 * update_array_info is used to change the configuration of an
4443 * on-line array.
4444 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4445 * fields in the info are checked against the array.
4446 * Any differences that cannot be handled will cause an error.
4447 * Normally, only one change can be managed at a time.
4448 */
4449static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4450{
4451 int rv = 0;
4452 int cnt = 0;
36fa3063
N		 4453 int state = 0;
4454
4455 /* calculate expected state,ignoring low bits */
4456 if (mddev->bitmap && mddev->bitmap_offset)
4457 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 4458
4459 if (mddev->major_version != info->major_version ||
4460 mddev->minor_version != info->minor_version ||
4461/* mddev->patch_version != info->patch_version || */
4462 mddev->ctime != info->ctime ||
4463 mddev->level != info->level ||
4464/* mddev->layout != info->layout || */
4465 !mddev->persistent != info->not_persistent||
36fa3063
N		 4466 mddev->chunk_size != info->chunk_size ||
4467 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4468 ((state^info->state) & 0xfffffe00)
4469 )
1da177e4
LT		 4470 return -EINVAL;
4471 /* Check there is only one change */
284ae7ca 4472 if (info->size >= 0 && mddev->size != info->size) cnt++;
1da177e4
LT		 4473 if (mddev->raid_disks != info->raid_disks) cnt++;
4474 if (mddev->layout != info->layout) cnt++;
36fa3063 4475 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 4476 if (cnt == 0) return 0;
4477 if (cnt > 1) return -EINVAL;
4478
4479 if (mddev->layout != info->layout) {
4480 /* Change layout
4481 * we don't need to do anything at the md level, the
4482 * personality will take care of it all.
4483 */
4484 if (mddev->pers->reconfig == NULL)
4485 return -EINVAL;
4486 else
4487 return mddev->pers->reconfig(mddev, info->layout, -1);
4488 }
284ae7ca 4489 if (info->size >= 0 && mddev->size != info->size)
a35b0d69
N		 4490 rv = update_size(mddev, info->size);
4491
da943b99
N		 4492 if (mddev->raid_disks != info->raid_disks)
4493 rv = update_raid_disks(mddev, info->raid_disks);
4494
36fa3063
N		 4495 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4496 if (mddev->pers->quiesce == NULL)
4497 return -EINVAL;
4498 if (mddev->recovery || mddev->sync_thread)
4499 return -EBUSY;
4500 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4501 /* add the bitmap */
4502 if (mddev->bitmap)
4503 return -EEXIST;
4504 if (mddev->default_bitmap_offset == 0)
4505 return -EINVAL;
4506 mddev->bitmap_offset = mddev->default_bitmap_offset;
4507 mddev->pers->quiesce(mddev, 1);
4508 rv = bitmap_create(mddev);
4509 if (rv)
4510 bitmap_destroy(mddev);
4511 mddev->pers->quiesce(mddev, 0);
4512 } else {
4513 /* remove the bitmap */
4514 if (!mddev->bitmap)
4515 return -ENOENT;
4516 if (mddev->bitmap->file)
4517 return -EINVAL;
4518 mddev->pers->quiesce(mddev, 1);
4519 bitmap_destroy(mddev);
4520 mddev->pers->quiesce(mddev, 0);
4521 mddev->bitmap_offset = 0;
4522 }
4523 }
850b2b42 4524 md_update_sb(mddev, 1);
1da177e4
LT		 4525 return rv;
4526}
4527
4528static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4529{
4530 mdk_rdev_t *rdev;
4531
4532 if (mddev->pers == NULL)
4533 return -ENODEV;
4534
4535 rdev = find_rdev(mddev, dev);
4536 if (!rdev)
4537 return -ENODEV;
4538
4539 md_error(mddev, rdev);
4540 return 0;
4541}
4542
a885c8c4
CH		 4543static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4544{
4545 mddev_t *mddev = bdev->bd_disk->private_data;
4546
4547 geo->heads = 2;
4548 geo->sectors = 4;
4549 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4550 return 0;
4551}
4552
1da177e4
LT		 4553static int md_ioctl(struct inode *inode, struct file *file,
4554 unsigned int cmd, unsigned long arg)
4555{
4556 int err = 0;
4557 void __user *argp = (void __user *)arg;
1da177e4
LT		 4558 mddev_t *mddev = NULL;
4559
4560 if (!capable(CAP_SYS_ADMIN))
4561 return -EACCES;
4562
4563 /*
4564 * Commands dealing with the RAID driver but not any
4565 * particular array:
4566 */
4567 switch (cmd)
4568 {
4569 case RAID_VERSION:
4570 err = get_version(argp);
4571 goto done;
4572
4573 case PRINT_RAID_DEBUG:
4574 err = 0;
4575 md_print_devices();
4576 goto done;
4577
4578#ifndef MODULE
4579 case RAID_AUTORUN:
4580 err = 0;
4581 autostart_arrays(arg);
4582 goto done;
4583#endif
4584 default:;
4585 }
4586
4587 /*
4588 * Commands creating/starting a new array:
4589 */
4590
4591 mddev = inode->i_bdev->bd_disk->private_data;
4592
4593 if (!mddev) {
4594 BUG();
4595 goto abort;
4596 }
4597
1da177e4
LT		 4598 err = mddev_lock(mddev);
4599 if (err) {
4600 printk(KERN_INFO
4601 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4602 err, cmd);
4603 goto abort;
4604 }
4605
4606 switch (cmd)
4607 {
4608 case SET_ARRAY_INFO:
4609 {
4610 mdu_array_info_t info;
4611 if (!arg)
4612 memset(&info, 0, sizeof(info));
4613 else if (copy_from_user(&info, argp, sizeof(info))) {
4614 err = -EFAULT;
4615 goto abort_unlock;
4616 }
4617 if (mddev->pers) {
4618 err = update_array_info(mddev, &info);
4619 if (err) {
4620 printk(KERN_WARNING "md: couldn't update"
4621 " array info. %d\n", err);
4622 goto abort_unlock;
4623 }
4624 goto done_unlock;
4625 }
4626 if (!list_empty(&mddev->disks)) {
4627 printk(KERN_WARNING
4628 "md: array %s already has disks!\n",
4629 mdname(mddev));
4630 err = -EBUSY;
4631 goto abort_unlock;
4632 }
4633 if (mddev->raid_disks) {
4634 printk(KERN_WARNING
4635 "md: array %s already initialised!\n",
4636 mdname(mddev));
4637 err = -EBUSY;
4638 goto abort_unlock;
4639 }
4640 err = set_array_info(mddev, &info);
4641 if (err) {
4642 printk(KERN_WARNING "md: couldn't set"
4643 " array info. %d\n", err);
4644 goto abort_unlock;
4645 }
4646 }
4647 goto done_unlock;
4648
4649 default:;
4650 }
4651
4652 /*
4653 * Commands querying/configuring an existing array:
4654 */
32a7627c 4655 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3f9d7b0d 4656 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
a17184a9
N		 4657 if ((!mddev->raid_disks && !mddev->external)
4658 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4659 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4660 && cmd != GET_BITMAP_FILE) {
1da177e4
LT		 4661 err = -ENODEV;
4662 goto abort_unlock;
4663 }
4664
4665 /*
4666 * Commands even a read-only array can execute:
4667 */
4668 switch (cmd)
4669 {
4670 case GET_ARRAY_INFO:
4671 err = get_array_info(mddev, argp);
4672 goto done_unlock;
4673
32a7627c 4674 case GET_BITMAP_FILE:
87162a28 4675 err = get_bitmap_file(mddev, argp);
32a7627c
N		 4676 goto done_unlock;
4677
1da177e4
LT		 4678 case GET_DISK_INFO:
4679 err = get_disk_info(mddev, argp);
4680 goto done_unlock;
4681
4682 case RESTART_ARRAY_RW:
4683 err = restart_array(mddev);
4684 goto done_unlock;
4685
4686 case STOP_ARRAY:
4687 err = do_md_stop (mddev, 0);
4688 goto done_unlock;
4689
4690 case STOP_ARRAY_RO:
4691 err = do_md_stop (mddev, 1);
4692 goto done_unlock;
4693
4694 /*
4695 * We have a problem here : there is no easy way to give a CHS
4696 * virtual geometry. We currently pretend that we have a 2 heads
4697 * 4 sectors (with a BIG number of cylinders...). This drives
4698 * dosfs just mad... ;-)
4699 */
1da177e4
LT		 4700 }
4701
4702 /*
4703 * The remaining ioctls are changing the state of the
f91de92e
N		 4704 * superblock, so we do not allow them on read-only arrays.
4705 * However non-MD ioctls (e.g. get-size) will still come through
4706 * here and hit the 'default' below, so only disallow
4707 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 4708 */
f91de92e
N		 4709 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4710 mddev->ro && mddev->pers) {
4711 if (mddev->ro == 2) {
4712 mddev->ro = 0;
4713 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4714 md_wakeup_thread(mddev->thread);
4715
4716 } else {
4717 err = -EROFS;
4718 goto abort_unlock;
4719 }
1da177e4
LT		 4720 }
4721
4722 switch (cmd)
4723 {
4724 case ADD_NEW_DISK:
4725 {
4726 mdu_disk_info_t info;
4727 if (copy_from_user(&info, argp, sizeof(info)))
4728 err = -EFAULT;
4729 else
4730 err = add_new_disk(mddev, &info);
4731 goto done_unlock;
4732 }
4733
4734 case HOT_REMOVE_DISK:
4735 err = hot_remove_disk(mddev, new_decode_dev(arg));
4736 goto done_unlock;
4737
4738 case HOT_ADD_DISK:
4739 err = hot_add_disk(mddev, new_decode_dev(arg));
4740 goto done_unlock;
4741
4742 case SET_DISK_FAULTY:
4743 err = set_disk_faulty(mddev, new_decode_dev(arg));
4744 goto done_unlock;
4745
4746 case RUN_ARRAY:
4747 err = do_md_run (mddev);
4748 goto done_unlock;
4749
32a7627c
N		 4750 case SET_BITMAP_FILE:
4751 err = set_bitmap_file(mddev, (int)arg);
4752 goto done_unlock;
4753
1da177e4 4754 default:
1da177e4
LT		 4755 err = -EINVAL;
4756 goto abort_unlock;
4757 }
4758
4759done_unlock:
4760abort_unlock:
4761 mddev_unlock(mddev);
4762
4763 return err;
4764done:
4765 if (err)
4766 MD_BUG();
4767abort:
4768 return err;
4769}
4770
4771static int md_open(struct inode *inode, struct file *file)
4772{
4773 /*
4774 * Succeed if we can lock the mddev, which confirms that
4775 * it isn't being stopped right now.
4776 */
4777 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4778 int err;
4779
d63a5a74 4780 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
1da177e4
LT		 4781 goto out;
4782
4783 err = 0;
4784 mddev_get(mddev);
4785 mddev_unlock(mddev);
4786
4787 check_disk_change(inode->i_bdev);
4788 out:
4789 return err;
4790}
4791
4792static int md_release(struct inode *inode, struct file * file)
4793{
4794 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4795
52e5f9d1 4796 BUG_ON(!mddev);
1da177e4
LT		 4797 mddev_put(mddev);
4798
4799 return 0;
4800}
4801
44ce6294
LT		 4802static int md_media_changed(struct gendisk *disk)
4803{
4804 mddev_t *mddev = disk->private_data;
4805
4806 return mddev->changed;
4807}
4808
4809static int md_revalidate(struct gendisk *disk)
4810{
4811 mddev_t *mddev = disk->private_data;
4812
4813 mddev->changed = 0;
4814 return 0;
4815}
1da177e4
LT		 4816static struct block_device_operations md_fops =
4817{
4818 .owner = THIS_MODULE,
4819 .open = md_open,
4820 .release = md_release,
4821 .ioctl = md_ioctl,
a885c8c4 4822 .getgeo = md_getgeo,
44ce6294
LT		 4823 .media_changed = md_media_changed,
4824 .revalidate_disk= md_revalidate,
1da177e4
LT		 4825};
4826
75c96f85 4827static int md_thread(void * arg)
1da177e4
LT		 4828{
4829 mdk_thread_t *thread = arg;
4830
1da177e4
LT		 4831 /*
4832 * md_thread is a 'system-thread', it's priority should be very
4833 * high. We avoid resource deadlocks individually in each
4834 * raid personality. (RAID5 does preallocation) We also use RR and
4835 * the very same RT priority as kswapd, thus we will never get
4836 * into a priority inversion deadlock.
4837 *
4838 * we definitely have to have equal or higher priority than
4839 * bdflush, otherwise bdflush will deadlock if there are too
4840 * many dirty RAID5 blocks.
4841 */
1da177e4 4842
6985c43f 4843 allow_signal(SIGKILL);
a6fb0934 4844 while (!kthread_should_stop()) {
1da177e4 4845
93588e22
N		 4846 /* We need to wait INTERRUPTIBLE so that
4847 * we don't add to the load-average.
4848 * That means we need to be sure no signals are
4849 * pending
4850 */
4851 if (signal_pending(current))
4852 flush_signals(current);
4853
4854 wait_event_interruptible_timeout
4855 (thread->wqueue,
4856 test_bit(THREAD_WAKEUP, &thread->flags)
4857 || kthread_should_stop(),
4858 thread->timeout);
1da177e4
LT		 4859
4860 clear_bit(THREAD_WAKEUP, &thread->flags);
4861
787453c2 4862 thread->run(thread->mddev);
1da177e4 4863 }
a6fb0934 4864
1da177e4
LT		 4865 return 0;
4866}
4867
4868void md_wakeup_thread(mdk_thread_t *thread)
4869{
4870 if (thread) {
4871 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4872 set_bit(THREAD_WAKEUP, &thread->flags);
4873 wake_up(&thread->wqueue);
4874 }
4875}
4876
4877mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4878 const char *name)
4879{
4880 mdk_thread_t *thread;
1da177e4 4881
9ffae0cf 4882 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 4883 if (!thread)
4884 return NULL;
4885
1da177e4
LT		 4886 init_waitqueue_head(&thread->wqueue);
4887
1da177e4
LT		 4888 thread->run = run;
4889 thread->mddev = mddev;
32a7627c 4890 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 4891 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 4892 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 4893 kfree(thread);
4894 return NULL;
4895 }
1da177e4
LT		 4896 return thread;
4897}
4898
1da177e4
LT		 4899void md_unregister_thread(mdk_thread_t *thread)
4900{
ba25f9dc 4901 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
a6fb0934
N		 4902
4903 kthread_stop(thread->tsk);
1da177e4
LT		 4904 kfree(thread);
4905}
4906
4907void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4908{
4909 if (!mddev) {
4910 MD_BUG();
4911 return;
4912 }
4913
b2d444d7 4914 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 4915 return;
32a7627c 4916/*
1da177e4
LT		 4917 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4918 mdname(mddev),
4919 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4920 __builtin_return_address(0),__builtin_return_address(1),
4921 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 4922*/
d0a0a5ee
AM		 4923 if (!mddev->pers)
4924 return;
1da177e4
LT		 4925 if (!mddev->pers->error_handler)
4926 return;
4927 mddev->pers->error_handler(mddev,rdev);
4928 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4929 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4930 md_wakeup_thread(mddev->thread);
c331eb04 4931 md_new_event_inintr(mddev);
1da177e4
LT		 4932}
4933
4934/* seq_file implementation /proc/mdstat */
4935
4936static void status_unused(struct seq_file *seq)
4937{
4938 int i = 0;
4939 mdk_rdev_t *rdev;
4940 struct list_head *tmp;
4941
4942 seq_printf(seq, "unused devices: ");
4943
73c34431 4944 rdev_for_each_list(rdev, tmp, pending_raid_disks) {
1da177e4
LT		 4945 char b[BDEVNAME_SIZE];
4946 i++;
4947 seq_printf(seq, "%s ",
4948 bdevname(rdev->bdev,b));
4949 }
4950 if (!i)
4951 seq_printf(seq, "<none>");
4952
4953 seq_printf(seq, "\n");
4954}
4955
4956
4957static void status_resync(struct seq_file *seq, mddev_t * mddev)
4958{
4588b42e
N		 4959 sector_t max_blocks, resync, res;
4960 unsigned long dt, db, rt;
4961 int scale;
4962 unsigned int per_milli;
1da177e4
LT		 4963
4964 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4965
4966 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4967 max_blocks = mddev->resync_max_sectors >> 1;
4968 else
4969 max_blocks = mddev->size;
4970
4971 /*
4972 * Should not happen.
4973 */
4974 if (!max_blocks) {
4975 MD_BUG();
4976 return;
4977 }
4588b42e
N		 4978 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4979 * in a sector_t, and (max_blocks>>scale) will fit in a
4980 * u32, as those are the requirements for sector_div.
4981 * Thus 'scale' must be at least 10
4982 */
4983 scale = 10;
4984 if (sizeof(sector_t) > sizeof(unsigned long)) {
4985 while ( max_blocks/2 > (1ULL<<(scale+32)))
4986 scale++;
4987 }
4988 res = (resync>>scale)*1000;
4989 sector_div(res, (u32)((max_blocks>>scale)+1));
4990
4991 per_milli = res;
1da177e4 4992 {
4588b42e 4993 int i, x = per_milli/50, y = 20-x;
1da177e4
LT		 4994 seq_printf(seq, "[");
4995 for (i = 0; i < x; i++)
4996 seq_printf(seq, "=");
4997 seq_printf(seq, ">");
4998 for (i = 0; i < y; i++)
4999 seq_printf(seq, ".");
5000 seq_printf(seq, "] ");
5001 }
4588b42e 5002 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
ccfcc3c1
N		 5003 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5004 "reshape" :
61df9d91
N		 5005 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5006 "check" :
5007 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5008 "resync" : "recovery"))),
5009 per_milli/10, per_milli % 10,
4588b42e
N		 5010 (unsigned long long) resync,
5011 (unsigned long long) max_blocks);
1da177e4
LT		 5012
5013 /*
5014 * We do not want to overflow, so the order of operands and
5015 * the * 100 / 100 trick are important. We do a +1 to be
5016 * safe against division by zero. We only estimate anyway.
5017 *
5018 * dt: time from mark until now
5019 * db: blocks written from mark until now
5020 * rt: remaining time
5021 */
5022 dt = ((jiffies - mddev->resync_mark) / HZ);
5023 if (!dt) dt++;
ff4e8d9a
N		 5024 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5025 - mddev->resync_mark_cnt;
5026 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
1da177e4
LT		 5027
5028 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
5029
ff4e8d9a 5030 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
1da177e4
LT		 5031}
5032
5033static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5034{
5035 struct list_head *tmp;
5036 loff_t l = *pos;
5037 mddev_t *mddev;
5038
5039 if (l >= 0x10000)
5040 return NULL;
5041 if (!l--)
5042 /* header */
5043 return (void*)1;
5044
5045 spin_lock(&all_mddevs_lock);
5046 list_for_each(tmp,&all_mddevs)
5047 if (!l--) {
5048 mddev = list_entry(tmp, mddev_t, all_mddevs);
5049 mddev_get(mddev);
5050 spin_unlock(&all_mddevs_lock);
5051 return mddev;
5052 }
5053 spin_unlock(&all_mddevs_lock);
5054 if (!l--)
5055 return (void*)2;/* tail */
5056 return NULL;
5057}
5058
5059static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
5060{
5061 struct list_head *tmp;
5062 mddev_t *next_mddev, *mddev = v;
5063
5064 ++*pos;
5065 if (v == (void*)2)
5066 return NULL;
5067
5068 spin_lock(&all_mddevs_lock);
5069 if (v == (void*)1)
5070 tmp = all_mddevs.next;
5071 else
5072 tmp = mddev->all_mddevs.next;
5073 if (tmp != &all_mddevs)
5074 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
5075 else {
5076 next_mddev = (void*)2;
5077 *pos = 0x10000;
5078 }
5079 spin_unlock(&all_mddevs_lock);
5080
5081 if (v != (void*)1)
5082 mddev_put(mddev);
5083 return next_mddev;
5084
5085}
5086
5087static void md_seq_stop(struct seq_file *seq, void *v)
5088{
5089 mddev_t *mddev = v;
5090
5091 if (mddev && v != (void*)1 && v != (void*)2)
5092 mddev_put(mddev);
5093}
5094
d7603b7e
N		 5095struct mdstat_info {
5096 int event;
5097};
5098
1da177e4
LT		 5099static int md_seq_show(struct seq_file *seq, void *v)
5100{
5101 mddev_t *mddev = v;
5102 sector_t size;
5103 struct list_head *tmp2;
5104 mdk_rdev_t *rdev;
d7603b7e 5105 struct mdstat_info *mi = seq->private;
32a7627c 5106 struct bitmap *bitmap;
1da177e4
LT		 5107
5108 if (v == (void*)1) {
2604b703 5109 struct mdk_personality *pers;
1da177e4
LT		 5110 seq_printf(seq, "Personalities : ");
5111 spin_lock(&pers_lock);
2604b703
N		 5112 list_for_each_entry(pers, &pers_list, list)
5113 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT		 5114
5115 spin_unlock(&pers_lock);
5116 seq_printf(seq, "\n");
d7603b7e 5117 mi->event = atomic_read(&md_event_count);
1da177e4
LT		 5118 return 0;
5119 }
5120 if (v == (void*)2) {
5121 status_unused(seq);
5122 return 0;
5123 }
5124
5dc5cf7d 5125 if (mddev_lock(mddev) < 0)
1da177e4 5126 return -EINTR;
5dc5cf7d 5127
1da177e4
LT		 5128 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5129 seq_printf(seq, "%s : %sactive", mdname(mddev),
5130 mddev->pers ? "" : "in");
5131 if (mddev->pers) {
f91de92e 5132 if (mddev->ro==1)
1da177e4 5133 seq_printf(seq, " (read-only)");
f91de92e
N		 5134 if (mddev->ro==2)
5135 seq_printf(seq, "(auto-read-only)");
1da177e4
LT		 5136 seq_printf(seq, " %s", mddev->pers->name);
5137 }
5138
5139 size = 0;
d089c6af 5140 rdev_for_each(rdev, tmp2, mddev) {
1da177e4
LT		 5141 char b[BDEVNAME_SIZE];
5142 seq_printf(seq, " %s[%d]",
5143 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 5144 if (test_bit(WriteMostly, &rdev->flags))
5145 seq_printf(seq, "(W)");
b2d444d7 5146 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 5147 seq_printf(seq, "(F)");
5148 continue;
b325a32e
N		 5149 } else if (rdev->raid_disk < 0)
5150 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 5151 size += rdev->size;
5152 }
5153
5154 if (!list_empty(&mddev->disks)) {
5155 if (mddev->pers)
5156 seq_printf(seq, "\n %llu blocks",
5157 (unsigned long long)mddev->array_size);
5158 else
5159 seq_printf(seq, "\n %llu blocks",
5160 (unsigned long long)size);
5161 }
1cd6bf19
N		 5162 if (mddev->persistent) {
5163 if (mddev->major_version != 0 ||
5164 mddev->minor_version != 90) {
5165 seq_printf(seq," super %d.%d",
5166 mddev->major_version,
5167 mddev->minor_version);
5168 }
e691063a
N		 5169 } else if (mddev->external)
5170 seq_printf(seq, " super external:%s",
5171 mddev->metadata_type);
5172 else
1cd6bf19 5173 seq_printf(seq, " super non-persistent");
1da177e4
LT		 5174
5175 if (mddev->pers) {
5176 mddev->pers->status (seq, mddev);
5177 seq_printf(seq, "\n ");
8e1b39d6
N		 5178 if (mddev->pers->sync_request) {
5179 if (mddev->curr_resync > 2) {
5180 status_resync (seq, mddev);
5181 seq_printf(seq, "\n ");
5182 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5183 seq_printf(seq, "\tresync=DELAYED\n ");
5184 else if (mddev->recovery_cp < MaxSector)
5185 seq_printf(seq, "\tresync=PENDING\n ");
5186 }
32a7627c
N		 5187 } else
5188 seq_printf(seq, "\n ");
5189
5190 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 5191 unsigned long chunk_kb;
5192 unsigned long flags;
32a7627c
N		 5193 spin_lock_irqsave(&bitmap->lock, flags);
5194 chunk_kb = bitmap->chunksize >> 10;
5195 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5196 "%lu%s chunk",
5197 bitmap->pages - bitmap->missing_pages,
5198 bitmap->pages,
5199 (bitmap->pages - bitmap->missing_pages)
5200 << (PAGE_SHIFT - 10),
5201 chunk_kb ? chunk_kb : bitmap->chunksize,
5202 chunk_kb ? "KB" : "B");
78d742d8
N		 5203 if (bitmap->file) {
5204 seq_printf(seq, ", file: ");
c32c2f63 5205 seq_path(seq, &bitmap->file->f_path, " \t\n");
32a7627c 5206 }
78d742d8 5207
32a7627c
N		 5208 seq_printf(seq, "\n");
5209 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 5210 }
5211
5212 seq_printf(seq, "\n");
5213 }
5214 mddev_unlock(mddev);
5215
5216 return 0;
5217}
5218
5219static struct seq_operations md_seq_ops = {
5220 .start = md_seq_start,
5221 .next = md_seq_next,
5222 .stop = md_seq_stop,
5223 .show = md_seq_show,
5224};
5225
5226static int md_seq_open(struct inode *inode, struct file *file)
5227{
5228 int error;
d7603b7e
N		 5229 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5230 if (mi == NULL)
5231 return -ENOMEM;
1da177e4
LT		 5232
5233 error = seq_open(file, &md_seq_ops);
d7603b7e
N		 5234 if (error)
5235 kfree(mi);
5236 else {
5237 struct seq_file *p = file->private_data;
5238 p->private = mi;
5239 mi->event = atomic_read(&md_event_count);
5240 }
1da177e4
LT		 5241 return error;
5242}
5243
d7603b7e
N		 5244static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5245{
5246 struct seq_file *m = filp->private_data;
5247 struct mdstat_info *mi = m->private;
5248 int mask;
5249
5250 poll_wait(filp, &md_event_waiters, wait);
5251
5252 /* always allow read */
5253 mask = POLLIN | POLLRDNORM;
5254
5255 if (mi->event != atomic_read(&md_event_count))
5256 mask |= POLLERR | POLLPRI;
5257 return mask;
5258}
5259
fa027c2a 5260static const struct file_operations md_seq_fops = {
e24650c2 5261 .owner = THIS_MODULE,
1da177e4
LT		 5262 .open = md_seq_open,
5263 .read = seq_read,
5264 .llseek = seq_lseek,
c3f94b40 5265 .release = seq_release_private,
d7603b7e 5266 .poll = mdstat_poll,
1da177e4
LT		 5267};
5268
2604b703 5269int register_md_personality(struct mdk_personality *p)
1da177e4 5270{
1da177e4 5271 spin_lock(&pers_lock);
2604b703
N		 5272 list_add_tail(&p->list, &pers_list);
5273 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
1da177e4
LT		 5274 spin_unlock(&pers_lock);
5275 return 0;
5276}
5277
2604b703 5278int unregister_md_personality(struct mdk_personality *p)
1da177e4 5279{
2604b703 5280 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 5281 spin_lock(&pers_lock);
2604b703 5282 list_del_init(&p->list);
1da177e4
LT		 5283 spin_unlock(&pers_lock);
5284 return 0;
5285}
5286
5287static int is_mddev_idle(mddev_t *mddev)
5288{
5289 mdk_rdev_t * rdev;
5290 struct list_head *tmp;
5291 int idle;
713f6ab1 5292 long curr_events;
1da177e4
LT		 5293
5294 idle = 1;
d089c6af 5295 rdev_for_each(rdev, tmp, mddev) {
1da177e4 5296 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 5297 curr_events = disk_stat_read(disk, sectors[0]) +
5298 disk_stat_read(disk, sectors[1]) -
1da177e4 5299 atomic_read(&disk->sync_io);
713f6ab1
N		 5300 /* sync IO will cause sync_io to increase before the disk_stats
5301 * as sync_io is counted when a request starts, and
5302 * disk_stats is counted when it completes.
5303 * So resync activity will cause curr_events to be smaller than
5304 * when there was no such activity.
5305 * non-sync IO will cause disk_stat to increase without
5306 * increasing sync_io so curr_events will (eventually)
5307 * be larger than it was before. Once it becomes
5308 * substantially larger, the test below will cause
5309 * the array to appear non-idle, and resync will slow
5310 * down.
5311 * If there is a lot of outstanding resync activity when
5312 * we set last_event to curr_events, then all that activity
5313 * completing might cause the array to appear non-idle
5314 * and resync will be slowed down even though there might
5315 * not have been non-resync activity. This will only
5316 * happen once though. 'last_events' will soon reflect
5317 * the state where there is little or no outstanding
5318 * resync requests, and further resync activity will
5319 * always make curr_events less than last_events.
c0e48521 5320 *
1da177e4 5321 */
713f6ab1 5322 if (curr_events - rdev->last_events > 4096) {
1da177e4
LT		 5323 rdev->last_events = curr_events;
5324 idle = 0;
5325 }
5326 }
5327 return idle;
5328}
5329
5330void md_done_sync(mddev_t *mddev, int blocks, int ok)
5331{
5332 /* another "blocks" (512byte) blocks have been synced */
5333 atomic_sub(blocks, &mddev->recovery_active);
5334 wake_up(&mddev->recovery_wait);
5335 if (!ok) {
5336 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5337 md_wakeup_thread(mddev->thread);
5338 // stop recovery, signal do_sync ....
5339 }
5340}
5341
5342
06d91a5f
N		 5343/* md_write_start(mddev, bi)
5344 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 5345 * in superblock) before writing, schedule a superblock update
5346 * and wait for it to complete.
06d91a5f 5347 */
3d310eb7 5348void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 5349{
06d91a5f 5350 if (bio_data_dir(bi) != WRITE)
3d310eb7 5351 return;
06d91a5f 5352
f91de92e
N		 5353 BUG_ON(mddev->ro == 1);
5354 if (mddev->ro == 2) {
5355 /* need to switch to read/write */
5356 mddev->ro = 0;
5357 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5358 md_wakeup_thread(mddev->thread);
25156198 5359 md_wakeup_thread(mddev->sync_thread);
f91de92e 5360 }
06d91a5f 5361 atomic_inc(&mddev->writes_pending);
06d91a5f 5362 if (mddev->in_sync) {
a9701a30 5363 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 5364 if (mddev->in_sync) {
5365 mddev->in_sync = 0;
850b2b42 5366 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3d310eb7
N		 5367 md_wakeup_thread(mddev->thread);
5368 }
a9701a30 5369 spin_unlock_irq(&mddev->write_lock);
06d91a5f 5370 }
850b2b42 5371 wait_event(mddev->sb_wait, mddev->flags==0);
1da177e4
LT		 5372}
5373
5374void md_write_end(mddev_t *mddev)
5375{
5376 if (atomic_dec_and_test(&mddev->writes_pending)) {
5377 if (mddev->safemode == 2)
5378 md_wakeup_thread(mddev->thread);
16f17b39 5379 else if (mddev->safemode_delay)
1da177e4
LT		 5380 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5381 }
5382}
5383
2a2275d6
N		 5384/* md_allow_write(mddev)
5385 * Calling this ensures that the array is marked 'active' so that writes
5386 * may proceed without blocking. It is important to call this before
5387 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5388 * Must be called with mddev_lock held.
5389 */
5390void md_allow_write(mddev_t *mddev)
5391{
5392 if (!mddev->pers)
5393 return;
5394 if (mddev->ro)
5395 return;
5396
5397 spin_lock_irq(&mddev->write_lock);
5398 if (mddev->in_sync) {
5399 mddev->in_sync = 0;
5400 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5401 if (mddev->safemode_delay &&
5402 mddev->safemode == 0)
5403 mddev->safemode = 1;
5404 spin_unlock_irq(&mddev->write_lock);
5405 md_update_sb(mddev, 0);
5406 } else
5407 spin_unlock_irq(&mddev->write_lock);
5408}
5409EXPORT_SYMBOL_GPL(md_allow_write);
5410
75c96f85 5411static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
1da177e4
LT		 5412
5413#define SYNC_MARKS 10
5414#define SYNC_MARK_STEP (3*HZ)
29269553 5415void md_do_sync(mddev_t *mddev)
1da177e4
LT		 5416{
5417 mddev_t *mddev2;
5418 unsigned int currspeed = 0,
5419 window;
57afd89f 5420 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 5421 unsigned long mark[SYNC_MARKS];
5422 sector_t mark_cnt[SYNC_MARKS];
5423 int last_mark,m;
5424 struct list_head *tmp;
5425 sector_t last_check;
57afd89f 5426 int skipped = 0;
5fd6c1dc
N		 5427 struct list_head *rtmp;
5428 mdk_rdev_t *rdev;
61df9d91 5429 char *desc;
1da177e4
LT		 5430
5431 /* just incase thread restarts... */
5432 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5433 return;
5fd6c1dc
N		 5434 if (mddev->ro) /* never try to sync a read-only array */
5435 return;
1da177e4 5436
61df9d91
N		 5437 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5438 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5439 desc = "data-check";
5440 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5441 desc = "requested-resync";
5442 else
5443 desc = "resync";
5444 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5445 desc = "reshape";
5446 else
5447 desc = "recovery";
5448
1da177e4
LT		 5449 /* we overload curr_resync somewhat here.
5450 * 0 == not engaged in resync at all
5451 * 2 == checking that there is no conflict with another sync
5452 * 1 == like 2, but have yielded to allow conflicting resync to
5453 * commense
5454 * other == active in resync - this many blocks
5455 *
5456 * Before starting a resync we must have set curr_resync to
5457 * 2, and then checked that every "conflicting" array has curr_resync
5458 * less than ours. When we find one that is the same or higher
5459 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5460 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5461 * This will mean we have to start checking from the beginning again.
5462 *
5463 */
5464
5465 do {
5466 mddev->curr_resync = 2;
5467
5468 try_again:
787453c2 5469 if (kthread_should_stop()) {
6985c43f 5470 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 5471 goto skip;
5472 }
29ac4aa3 5473 for_each_mddev(mddev2, tmp) {
1da177e4
LT		 5474 if (mddev2 == mddev)
5475 continue;
5476 if (mddev2->curr_resync &&
5477 match_mddev_units(mddev,mddev2)) {
5478 DEFINE_WAIT(wq);
5479 if (mddev < mddev2 && mddev->curr_resync == 2) {
5480 /* arbitrarily yield */
5481 mddev->curr_resync = 1;
5482 wake_up(&resync_wait);
5483 }
5484 if (mddev > mddev2 && mddev->curr_resync == 1)
5485 /* no need to wait here, we can wait the next
5486 * time 'round when curr_resync == 2
5487 */
5488 continue;
787453c2
N		 5489 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5490 if (!kthread_should_stop() &&
8712e553 5491 mddev2->curr_resync >= mddev->curr_resync) {
61df9d91
N		 5492 printk(KERN_INFO "md: delaying %s of %s"
5493 " until %s has finished (they"
1da177e4 5494 " share one or more physical units)\n",
61df9d91 5495 desc, mdname(mddev), mdname(mddev2));
1da177e4
LT		 5496 mddev_put(mddev2);
5497 schedule();
5498 finish_wait(&resync_wait, &wq);
5499 goto try_again;
5500 }
5501 finish_wait(&resync_wait, &wq);
5502 }
5503 }
5504 } while (mddev->curr_resync < 2);
5505
5fd6c1dc 5506 j = 0;
9d88883e 5507 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 5508 /* resync follows the size requested by the personality,
57afd89f 5509 * which defaults to physical size, but can be virtual size
1da177e4
LT		 5510 */
5511 max_sectors = mddev->resync_max_sectors;
9d88883e 5512 mddev->resync_mismatches = 0;
5fd6c1dc
N		 5513 /* we don't use the checkpoint if there's a bitmap */
5514 if (!mddev->bitmap &&
5515 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5516 j = mddev->recovery_cp;
ccfcc3c1
N		 5517 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5518 max_sectors = mddev->size << 1;
5fd6c1dc 5519 else {
1da177e4
LT		 5520 /* recovery follows the physical size of devices */
5521 max_sectors = mddev->size << 1;
5fd6c1dc 5522 j = MaxSector;
d089c6af 5523 rdev_for_each(rdev, rtmp, mddev)
5fd6c1dc
N		 5524 if (rdev->raid_disk >= 0 &&
5525 !test_bit(Faulty, &rdev->flags) &&
5526 !test_bit(In_sync, &rdev->flags) &&
5527 rdev->recovery_offset < j)
5528 j = rdev->recovery_offset;
5529 }
1da177e4 5530
61df9d91
N		 5531 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5532 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5533 " %d KB/sec/disk.\n", speed_min(mddev));
338cec32 5534 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
61df9d91
N		 5535 "(but not more than %d KB/sec) for %s.\n",
5536 speed_max(mddev), desc);
1da177e4
LT		 5537
5538 is_mddev_idle(mddev); /* this also initializes IO event counters */
5fd6c1dc 5539
57afd89f 5540 io_sectors = 0;
1da177e4
LT		 5541 for (m = 0; m < SYNC_MARKS; m++) {
5542 mark[m] = jiffies;
57afd89f 5543 mark_cnt[m] = io_sectors;
1da177e4
LT		 5544 }
5545 last_mark = 0;
5546 mddev->resync_mark = mark[last_mark];
5547 mddev->resync_mark_cnt = mark_cnt[last_mark];
5548
5549 /*
5550 * Tune reconstruction:
5551 */
5552 window = 32*(PAGE_SIZE/512);
5553 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5554 window/2,(unsigned long long) max_sectors/2);
5555
5556 atomic_set(&mddev->recovery_active, 0);
5557 init_waitqueue_head(&mddev->recovery_wait);
5558 last_check = 0;
5559
5560 if (j>2) {
5561 printk(KERN_INFO
61df9d91
N		 5562 "md: resuming %s of %s from checkpoint.\n",
5563 desc, mdname(mddev));
1da177e4
LT		 5564 mddev->curr_resync = j;
5565 }
5566
5567 while (j < max_sectors) {
57afd89f 5568 sector_t sectors;
1da177e4 5569
57afd89f 5570 skipped = 0;
c6207277
N		 5571 if (j >= mddev->resync_max) {
5572 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5573 wait_event(mddev->recovery_wait,
5574 mddev->resync_max > j
5575 || kthread_should_stop());
5576 }
5577 if (kthread_should_stop())
5578 goto interrupted;
57afd89f 5579 sectors = mddev->pers->sync_request(mddev, j, &skipped,
c6207277 5580 currspeed < speed_min(mddev));
57afd89f 5581 if (sectors == 0) {
1da177e4
LT		 5582 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5583 goto out;
5584 }
57afd89f
N		 5585
5586 if (!skipped) { /* actual IO requested */
5587 io_sectors += sectors;
5588 atomic_add(sectors, &mddev->recovery_active);
5589 }
5590
1da177e4
LT		 5591 j += sectors;
5592 if (j>1) mddev->curr_resync = j;
ff4e8d9a 5593 mddev->curr_mark_cnt = io_sectors;
d7603b7e
N		 5594 if (last_check == 0)
5595 /* this is the earliers that rebuilt will be
5596 * visible in /proc/mdstat
5597 */
5598 md_new_event(mddev);
57afd89f
N		 5599
5600 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 5601 continue;
5602
57afd89f 5603 last_check = io_sectors;
1da177e4
LT		 5604
5605 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
5606 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
5607 break;
5608
5609 repeat:
5610 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5611 /* step marks */
5612 int next = (last_mark+1) % SYNC_MARKS;
5613
5614 mddev->resync_mark = mark[next];
5615 mddev->resync_mark_cnt = mark_cnt[next];
5616 mark[next] = jiffies;
57afd89f 5617 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 5618 last_mark = next;
5619 }
5620
5621
c6207277
N		 5622 if (kthread_should_stop())
5623 goto interrupted;
5624
1da177e4
LT		 5625
5626 /*
5627 * this loop exits only if either when we are slower than
5628 * the 'hard' speed limit, or the system was IO-idle for
5629 * a jiffy.
5630 * the system might be non-idle CPU-wise, but we only care
5631 * about not overloading the IO subsystem. (things like an
5632 * e2fsck being done on the RAID array should execute fast)
5633 */
2ad8b1ef 5634 blk_unplug(mddev->queue);
1da177e4
LT		 5635 cond_resched();
5636
57afd89f
N		 5637 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5638 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4 5639
88202a0c
N		 5640 if (currspeed > speed_min(mddev)) {
5641 if ((currspeed > speed_max(mddev)) ||
1da177e4 5642 !is_mddev_idle(mddev)) {
c0e48521 5643 msleep(500);
1da177e4
LT		 5644 goto repeat;
5645 }
5646 }
5647 }
61df9d91 5648 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
1da177e4
LT		 5649 /*
5650 * this also signals 'finished resyncing' to md_stop
5651 */
5652 out:
2ad8b1ef 5653 blk_unplug(mddev->queue);
1da177e4
LT		 5654
5655 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5656
5657 /* tell personality that we are finished */
57afd89f 5658 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 5659
5660 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
ccfcc3c1 5661 !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5fd6c1dc
N		 5662 mddev->curr_resync > 2) {
5663 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5664 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5665 if (mddev->curr_resync >= mddev->recovery_cp) {
5666 printk(KERN_INFO
61df9d91
N		 5667 "md: checkpointing %s of %s.\n",
5668 desc, mdname(mddev));
5fd6c1dc
N		 5669 mddev->recovery_cp = mddev->curr_resync;
5670 }
5671 } else
5672 mddev->recovery_cp = MaxSector;
5673 } else {
5674 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5675 mddev->curr_resync = MaxSector;
d089c6af 5676 rdev_for_each(rdev, rtmp, mddev)
5fd6c1dc
N		 5677 if (rdev->raid_disk >= 0 &&
5678 !test_bit(Faulty, &rdev->flags) &&
5679 !test_bit(In_sync, &rdev->flags) &&
5680 rdev->recovery_offset < mddev->curr_resync)
5681 rdev->recovery_offset = mddev->curr_resync;
5fd6c1dc 5682 }
1da177e4 5683 }
17571284 5684 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 5685
1da177e4
LT		 5686 skip:
5687 mddev->curr_resync = 0;
c6207277
N		 5688 mddev->resync_max = MaxSector;
5689 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
1da177e4
LT		 5690 wake_up(&resync_wait);
5691 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5692 md_wakeup_thread(mddev->thread);
c6207277
N		 5693 return;
5694
5695 interrupted:
5696 /*
5697 * got a signal, exit.
5698 */
5699 printk(KERN_INFO
5700 "md: md_do_sync() got signal ... exiting\n");
5701 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5702 goto out;
5703
1da177e4 5704}
29269553 5705EXPORT_SYMBOL_GPL(md_do_sync);
1da177e4
LT		 5706
5707
b4c4c7b8
N		 5708static int remove_and_add_spares(mddev_t *mddev)
5709{
5710 mdk_rdev_t *rdev;
5711 struct list_head *rtmp;
5712 int spares = 0;
5713
d089c6af 5714 rdev_for_each(rdev, rtmp, mddev)
b4c4c7b8 5715 if (rdev->raid_disk >= 0 &&
c303da6d 5716 !mddev->external &&
b4c4c7b8
N		 5717 (test_bit(Faulty, &rdev->flags) ||
5718 ! test_bit(In_sync, &rdev->flags)) &&
5719 atomic_read(&rdev->nr_pending)==0) {
5720 if (mddev->pers->hot_remove_disk(
5721 mddev, rdev->raid_disk)==0) {
5722 char nm[20];
5723 sprintf(nm,"rd%d", rdev->raid_disk);
5724 sysfs_remove_link(&mddev->kobj, nm);
5725 rdev->raid_disk = -1;
5726 }
5727 }
5728
5729 if (mddev->degraded) {
d089c6af 5730 rdev_for_each(rdev, rtmp, mddev)
b4c4c7b8
N		 5731 if (rdev->raid_disk < 0
5732 && !test_bit(Faulty, &rdev->flags)) {
5733 rdev->recovery_offset = 0;
5734 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5735 char nm[20];
5736 sprintf(nm, "rd%d", rdev->raid_disk);
5e55e2f5
N		 5737 if (sysfs_create_link(&mddev->kobj,
5738 &rdev->kobj, nm))
5739 printk(KERN_WARNING
5740 "md: cannot register "
5741 "%s for %s\n",
5742 nm, mdname(mddev));
b4c4c7b8
N		 5743 spares++;
5744 md_new_event(mddev);
5745 } else
5746 break;
5747 }
5748 }
5749 return spares;
5750}
1da177e4
LT		 5751/*
5752 * This routine is regularly called by all per-raid-array threads to
5753 * deal with generic issues like resync and super-block update.
5754 * Raid personalities that don't have a thread (linear/raid0) do not
5755 * need this as they never do any recovery or update the superblock.
5756 *
5757 * It does not do any resync itself, but rather "forks" off other threads
5758 * to do that as needed.
5759 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5760 * "->recovery" and create a thread at ->sync_thread.
5761 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5762 * and wakeups up this thread which will reap the thread and finish up.
5763 * This thread also removes any faulty devices (with nr_pending == 0).
5764 *
5765 * The overall approach is:
5766 * 1/ if the superblock needs updating, update it.
5767 * 2/ If a recovery thread is running, don't do anything else.
5768 * 3/ If recovery has finished, clean up, possibly marking spares active.
5769 * 4/ If there are any faulty devices, remove them.
5770 * 5/ If array is degraded, try to add spares devices
5771 * 6/ If array has spares or is not in-sync, start a resync thread.
5772 */
5773void md_check_recovery(mddev_t *mddev)
5774{
5775 mdk_rdev_t *rdev;
5776 struct list_head *rtmp;
5777
5778
5f40402d
N		 5779 if (mddev->bitmap)
5780 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 5781
5782 if (mddev->ro)
5783 return;
fca4d848
N		 5784
5785 if (signal_pending(current)) {
5786 if (mddev->pers->sync_request) {
5787 printk(KERN_INFO "md: %s in immediate safe mode\n",
5788 mdname(mddev));
5789 mddev->safemode = 2;
5790 }
5791 flush_signals(current);
5792 }
5793
1da177e4 5794 if ( ! (
e691063a 5795 (mddev->flags && !mddev->external) ||
1da177e4 5796 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848
N		 5797 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
5798 (mddev->safemode == 1) ||
5799 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5800 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 5801 ))
5802 return;
fca4d848 5803
df5b89b3 5804 if (mddev_trylock(mddev)) {
b4c4c7b8 5805 int spares = 0;
fca4d848 5806
a9701a30 5807 spin_lock_irq(&mddev->write_lock);
fca4d848
N		 5808 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
5809 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
5810 mddev->in_sync = 1;
e691063a
N		 5811 if (mddev->persistent)
5812 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
fca4d848
N		 5813 }
5814 if (mddev->safemode == 1)
5815 mddev->safemode = 0;
a9701a30 5816 spin_unlock_irq(&mddev->write_lock);
fca4d848 5817
850b2b42
N		 5818 if (mddev->flags)
5819 md_update_sb(mddev, 0);
06d91a5f 5820
06d91a5f 5821
1da177e4
LT		 5822 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
5823 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
5824 /* resync/recovery still happening */
5825 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5826 goto unlock;
5827 }
5828 if (mddev->sync_thread) {
5829 /* resync has finished, collect result */
5830 md_unregister_thread(mddev->sync_thread);
5831 mddev->sync_thread = NULL;
5832 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5833 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5834 /* success...*/
5835 /* activate any spares */
5836 mddev->pers->spare_active(mddev);
5837 }
850b2b42 5838 md_update_sb(mddev, 1);
41158c7e
N		 5839
5840 /* if array is no-longer degraded, then any saved_raid_disk
5841 * information must be scrapped
5842 */
5843 if (!mddev->degraded)
d089c6af 5844 rdev_for_each(rdev, rtmp, mddev)
41158c7e
N		 5845 rdev->saved_raid_disk = -1;
5846
1da177e4
LT		 5847 mddev->recovery = 0;
5848 /* flag recovery needed just to double check */
5849 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
d7603b7e 5850 md_new_event(mddev);
1da177e4
LT		 5851 goto unlock;
5852 }
24dd469d
N		 5853 /* Clear some bits that don't mean anything, but
5854 * might be left set
5855 */
5856 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5857 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
5858 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
5859 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4 5860
5fd6c1dc
N		 5861 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5862 goto unlock;
1da177e4
LT		 5863 /* no recovery is running.
5864 * remove any failed drives, then
5865 * add spares if possible.
5866 * Spare are also removed and re-added, to allow
5867 * the personality to fail the re-add.
5868 */
1da177e4 5869
b4c4c7b8
N		 5870 if (mddev->reshape_position != MaxSector) {
5871 if (mddev->pers->check_reshape(mddev) != 0)
5872 /* Cannot proceed */
5873 goto unlock;
5874 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
5875 } else if ((spares = remove_and_add_spares(mddev))) {
24dd469d
N		 5876 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5877 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5878 } else if (mddev->recovery_cp < MaxSector) {
5879 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5880 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5881 /* nothing to be done ... */
1da177e4 5882 goto unlock;
24dd469d 5883
1da177e4
LT		 5884 if (mddev->pers->sync_request) {
5885 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 5886 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
5887 /* We are adding a device or devices to an array
5888 * which has the bitmap stored on all devices.
5889 * So make sure all bitmap pages get written
5890 */
5891 bitmap_write_all(mddev->bitmap);
5892 }
1da177e4
LT		 5893 mddev->sync_thread = md_register_thread(md_do_sync,
5894 mddev,
5895 "%s_resync");
5896 if (!mddev->sync_thread) {
5897 printk(KERN_ERR "%s: could not start resync"
5898 " thread...\n",
5899 mdname(mddev));
5900 /* leave the spares where they are, it shouldn't hurt */
5901 mddev->recovery = 0;
d7603b7e 5902 } else
1da177e4 5903 md_wakeup_thread(mddev->sync_thread);
d7603b7e 5904 md_new_event(mddev);
1da177e4
LT		 5905 }
5906 unlock:
5907 mddev_unlock(mddev);
5908 }
5909}
5910
75c96f85
AB		 5911static int md_notify_reboot(struct notifier_block *this,
5912 unsigned long code, void *x)
1da177e4
LT		 5913{
5914 struct list_head *tmp;
5915 mddev_t *mddev;
5916
5917 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
5918
5919 printk(KERN_INFO "md: stopping all md devices.\n");
5920
29ac4aa3 5921 for_each_mddev(mddev, tmp)
c71d4887 5922 if (mddev_trylock(mddev)) {
1da177e4 5923 do_md_stop (mddev, 1);
c71d4887
NB		 5924 mddev_unlock(mddev);
5925 }
1da177e4
LT		 5926 /*
5927 * certain more exotic SCSI devices are known to be
5928 * volatile wrt too early system reboots. While the
5929 * right place to handle this issue is the given
5930 * driver, we do want to have a safe RAID driver ...
5931 */
5932 mdelay(1000*1);
5933 }
5934 return NOTIFY_DONE;
5935}
5936
75c96f85 5937static struct notifier_block md_notifier = {
1da177e4
LT		 5938 .notifier_call = md_notify_reboot,
5939 .next = NULL,
5940 .priority = INT_MAX, /* before any real devices */
5941};
5942
5943static void md_geninit(void)
5944{
5945 struct proc_dir_entry *p;
5946
5947 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5948
5949 p = create_proc_entry("mdstat", S_IRUGO, NULL);
5950 if (p)
5951 p->proc_fops = &md_seq_fops;
5952}
5953
75c96f85 5954static int __init md_init(void)
1da177e4 5955{
1da177e4
LT		 5956 if (register_blkdev(MAJOR_NR, "md"))
5957 return -1;
5958 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
5959 unregister_blkdev(MAJOR_NR, "md");
5960 return -1;
5961 }
e8703fe1
N		 5962 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
5963 md_probe, NULL, NULL);
5964 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
1da177e4
LT		 5965 md_probe, NULL, NULL);
5966
1da177e4 5967 register_reboot_notifier(&md_notifier);
0b4d4147 5968 raid_table_header = register_sysctl_table(raid_root_table);
1da177e4
LT		 5969
5970 md_geninit();
5971 return (0);
5972}
5973
5974
5975#ifndef MODULE
5976
5977/*
5978 * Searches all registered partitions for autorun RAID arrays
5979 * at boot time.
5980 */
4d936ec1
ME		 5981
5982static LIST_HEAD(all_detected_devices);
5983struct detected_devices_node {
5984 struct list_head list;
5985 dev_t dev;
5986};
1da177e4
LT		 5987
5988void md_autodetect_dev(dev_t dev)
5989{
4d936ec1
ME		 5990 struct detected_devices_node *node_detected_dev;
5991
5992 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
5993 if (node_detected_dev) {
5994 node_detected_dev->dev = dev;
5995 list_add_tail(&node_detected_dev->list, &all_detected_devices);
5996 } else {
5997 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
5998 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
5999 }
1da177e4
LT		 6000}
6001
6002
6003static void autostart_arrays(int part)
6004{
6005 mdk_rdev_t *rdev;
4d936ec1
ME		 6006 struct detected_devices_node *node_detected_dev;
6007 dev_t dev;
6008 int i_scanned, i_passed;
1da177e4 6009
4d936ec1
ME		 6010 i_scanned = 0;
6011 i_passed = 0;
1da177e4 6012
4d936ec1 6013 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
1da177e4 6014
4d936ec1
ME		 6015 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6016 i_scanned++;
6017 node_detected_dev = list_entry(all_detected_devices.next,
6018 struct detected_devices_node, list);
6019 list_del(&node_detected_dev->list);
6020 dev = node_detected_dev->dev;
6021 kfree(node_detected_dev);
df968c4e 6022 rdev = md_import_device(dev,0, 90);
1da177e4
LT		 6023 if (IS_ERR(rdev))
6024 continue;
6025
b2d444d7 6026 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 6027 MD_BUG();
6028 continue;
6029 }
d0fae18f 6030 set_bit(AutoDetected, &rdev->flags);
1da177e4 6031 list_add(&rdev->same_set, &pending_raid_disks);
4d936ec1 6032 i_passed++;
1da177e4 6033 }
4d936ec1
ME		 6034
6035 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6036 i_scanned, i_passed);
1da177e4
LT		 6037
6038 autorun_devices(part);
6039}
6040
fdee8ae4 6041#endif /* !MODULE */
1da177e4
LT		 6042
6043static __exit void md_exit(void)
6044{
6045 mddev_t *mddev;
6046 struct list_head *tmp;
8ab5e4c1 6047
e8703fe1
N		 6048 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
6049 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
1da177e4
LT		 6050
6051 unregister_blkdev(MAJOR_NR,"md");
6052 unregister_blkdev(mdp_major, "mdp");
6053 unregister_reboot_notifier(&md_notifier);
6054 unregister_sysctl_table(raid_table_header);
6055 remove_proc_entry("mdstat", NULL);
29ac4aa3 6056 for_each_mddev(mddev, tmp) {
1da177e4
LT		 6057 struct gendisk *disk = mddev->gendisk;
6058 if (!disk)
6059 continue;
6060 export_array(mddev);
6061 del_gendisk(disk);
6062 put_disk(disk);
6063 mddev->gendisk = NULL;
6064 mddev_put(mddev);
6065 }
6066}
6067
685784aa 6068subsys_initcall(md_init);
1da177e4
LT		 6069module_exit(md_exit)
6070
f91de92e
N		 6071static int get_ro(char *buffer, struct kernel_param *kp)
6072{
6073 return sprintf(buffer, "%d", start_readonly);
6074}
6075static int set_ro(const char *val, struct kernel_param *kp)
6076{
6077 char *e;
6078 int num = simple_strtoul(val, &e, 10);
6079 if (*val && (*e == '\0' || *e == '\n')) {
6080 start_readonly = num;
4dbcdc75 6081 return 0;
f91de92e
N		 6082 }
6083 return -EINVAL;
6084}
6085
80ca3a44
N		 6086module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6087module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6ff8d8ec 6088
f91de92e 6089
1da177e4
LT		 6090EXPORT_SYMBOL(register_md_personality);
6091EXPORT_SYMBOL(unregister_md_personality);
6092EXPORT_SYMBOL(md_error);
6093EXPORT_SYMBOL(md_done_sync);
6094EXPORT_SYMBOL(md_write_start);
6095EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 6096EXPORT_SYMBOL(md_register_thread);
6097EXPORT_SYMBOL(md_unregister_thread);
6098EXPORT_SYMBOL(md_wakeup_thread);
1da177e4
LT		 6099EXPORT_SYMBOL(md_check_recovery);
6100MODULE_LICENSE("GPL");
aa1595e9 6101MODULE_ALIAS("md");
72008652 6102MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
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