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md: fix 'safemode' handling for external metadata.
[net-next-2.6.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;
d897dbf9 279 new->level = LEVEL_NONE;
1da177e4
LT		 280
281 new->queue = blk_alloc_queue(GFP_KERNEL);
282 if (!new->queue) {
283 kfree(new);
284 return NULL;
285 }
75ad23bc
NP		 286 /* Can be unlocked because the queue is new: no concurrency */
287 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, new->queue);
1da177e4
LT		 288
289 blk_queue_make_request(new->queue, md_fail_request);
290
291 goto retry;
292}
293
294static inline int mddev_lock(mddev_t * mddev)
295{
df5b89b3 296 return mutex_lock_interruptible(&mddev->reconfig_mutex);
1da177e4
LT		 297}
298
1da177e4
LT		 299static inline int mddev_trylock(mddev_t * mddev)
300{
df5b89b3 301 return mutex_trylock(&mddev->reconfig_mutex);
1da177e4
LT		 302}
303
304static inline void mddev_unlock(mddev_t * mddev)
305{
df5b89b3 306 mutex_unlock(&mddev->reconfig_mutex);
1da177e4 307
005eca5e 308 md_wakeup_thread(mddev->thread);
1da177e4
LT		 309}
310
2989ddbd 311static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
1da177e4
LT		 312{
313 mdk_rdev_t * rdev;
314 struct list_head *tmp;
315
d089c6af 316 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 317 if (rdev->desc_nr == nr)
318 return rdev;
319 }
320 return NULL;
321}
322
323static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
324{
325 struct list_head *tmp;
326 mdk_rdev_t *rdev;
327
d089c6af 328 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 329 if (rdev->bdev->bd_dev == dev)
330 return rdev;
331 }
332 return NULL;
333}
334
d9d166c2 335static struct mdk_personality *find_pers(int level, char *clevel)
2604b703
N		 336{
337 struct mdk_personality *pers;
d9d166c2
N		 338 list_for_each_entry(pers, &pers_list, list) {
339 if (level != LEVEL_NONE && pers->level == level)
2604b703 340 return pers;
d9d166c2
N		 341 if (strcmp(pers->name, clevel)==0)
342 return pers;
343 }
2604b703
N		 344 return NULL;
345}
346
77933d72 347static inline sector_t calc_dev_sboffset(struct block_device *bdev)
1da177e4
LT		 348{
349 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
350 return MD_NEW_SIZE_BLOCKS(size);
351}
352
353static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
354{
355 sector_t size;
356
357 size = rdev->sb_offset;
358
359 if (chunk_size)
360 size &= ~((sector_t)chunk_size/1024 - 1);
361 return size;
362}
363
364static int alloc_disk_sb(mdk_rdev_t * rdev)
365{
366 if (rdev->sb_page)
367 MD_BUG();
368
369 rdev->sb_page = alloc_page(GFP_KERNEL);
370 if (!rdev->sb_page) {
371 printk(KERN_ALERT "md: out of memory.\n");
372 return -EINVAL;
373 }
374
375 return 0;
376}
377
378static void free_disk_sb(mdk_rdev_t * rdev)
379{
380 if (rdev->sb_page) {
2d1f3b5d 381 put_page(rdev->sb_page);
1da177e4
LT		 382 rdev->sb_loaded = 0;
383 rdev->sb_page = NULL;
384 rdev->sb_offset = 0;
385 rdev->size = 0;
386 }
387}
388
389
6712ecf8 390static void super_written(struct bio *bio, int error)
7bfa19f2
N		 391{
392 mdk_rdev_t *rdev = bio->bi_private;
a9701a30 393 mddev_t *mddev = rdev->mddev;
7bfa19f2 394
3a0f5bbb
N		 395 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
396 printk("md: super_written gets error=%d, uptodate=%d\n",
397 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
398 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
a9701a30 399 md_error(mddev, rdev);
3a0f5bbb 400 }
7bfa19f2 401
a9701a30
N		 402 if (atomic_dec_and_test(&mddev->pending_writes))
403 wake_up(&mddev->sb_wait);
f8b58edf 404 bio_put(bio);
7bfa19f2
N		 405}
406
6712ecf8 407static void super_written_barrier(struct bio *bio, int error)
a9701a30
N		 408{
409 struct bio *bio2 = bio->bi_private;
410 mdk_rdev_t *rdev = bio2->bi_private;
411 mddev_t *mddev = rdev->mddev;
a9701a30
N		 412
413 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
414 error == -EOPNOTSUPP) {
415 unsigned long flags;
416 /* barriers don't appear to be supported :-( */
417 set_bit(BarriersNotsupp, &rdev->flags);
418 mddev->barriers_work = 0;
419 spin_lock_irqsave(&mddev->write_lock, flags);
420 bio2->bi_next = mddev->biolist;
421 mddev->biolist = bio2;
422 spin_unlock_irqrestore(&mddev->write_lock, flags);
423 wake_up(&mddev->sb_wait);
424 bio_put(bio);
6712ecf8
N		 425 } else {
426 bio_put(bio2);
427 bio->bi_private = rdev;
428 super_written(bio, error);
a9701a30 429 }
a9701a30
N		 430}
431
7bfa19f2
N		 432void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
433 sector_t sector, int size, struct page *page)
434{
435 /* write first size bytes of page to sector of rdev
436 * Increment mddev->pending_writes before returning
437 * and decrement it on completion, waking up sb_wait
438 * if zero is reached.
439 * If an error occurred, call md_error
a9701a30
N		 440 *
441 * As we might need to resubmit the request if BIO_RW_BARRIER
442 * causes ENOTSUPP, we allocate a spare bio...
7bfa19f2
N		 443 */
444 struct bio *bio = bio_alloc(GFP_NOIO, 1);
a9701a30 445 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
7bfa19f2
N		 446
447 bio->bi_bdev = rdev->bdev;
448 bio->bi_sector = sector;
449 bio_add_page(bio, page, size, 0);
450 bio->bi_private = rdev;
451 bio->bi_end_io = super_written;
a9701a30
N		 452 bio->bi_rw = rw;
453
7bfa19f2 454 atomic_inc(&mddev->pending_writes);
a9701a30
N		 455 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
456 struct bio *rbio;
457 rw |= (1<<BIO_RW_BARRIER);
458 rbio = bio_clone(bio, GFP_NOIO);
459 rbio->bi_private = bio;
460 rbio->bi_end_io = super_written_barrier;
461 submit_bio(rw, rbio);
462 } else
463 submit_bio(rw, bio);
464}
465
466void md_super_wait(mddev_t *mddev)
467{
468 /* wait for all superblock writes that were scheduled to complete.
469 * if any had to be retried (due to BARRIER problems), retry them
470 */
471 DEFINE_WAIT(wq);
472 for(;;) {
473 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
474 if (atomic_read(&mddev->pending_writes)==0)
475 break;
476 while (mddev->biolist) {
477 struct bio *bio;
478 spin_lock_irq(&mddev->write_lock);
479 bio = mddev->biolist;
480 mddev->biolist = bio->bi_next ;
481 bio->bi_next = NULL;
482 spin_unlock_irq(&mddev->write_lock);
483 submit_bio(bio->bi_rw, bio);
484 }
485 schedule();
486 }
487 finish_wait(&mddev->sb_wait, &wq);
7bfa19f2
N		 488}
489
6712ecf8 490static void bi_complete(struct bio *bio, int error)
1da177e4 491{
1da177e4 492 complete((struct completion*)bio->bi_private);
1da177e4
LT		 493}
494
a654b9d8 495int sync_page_io(struct block_device *bdev, sector_t sector, int size,
1da177e4
LT		 496 struct page *page, int rw)
497{
baaa2c51 498 struct bio *bio = bio_alloc(GFP_NOIO, 1);
1da177e4
LT		 499 struct completion event;
500 int ret;
501
502 rw |= (1 << BIO_RW_SYNC);
503
504 bio->bi_bdev = bdev;
505 bio->bi_sector = sector;
506 bio_add_page(bio, page, size, 0);
507 init_completion(&event);
508 bio->bi_private = &event;
509 bio->bi_end_io = bi_complete;
510 submit_bio(rw, bio);
511 wait_for_completion(&event);
512
513 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
514 bio_put(bio);
515 return ret;
516}
a8745db2 517EXPORT_SYMBOL_GPL(sync_page_io);
1da177e4 518
0002b271 519static int read_disk_sb(mdk_rdev_t * rdev, int size)
1da177e4
LT		 520{
521 char b[BDEVNAME_SIZE];
522 if (!rdev->sb_page) {
523 MD_BUG();
524 return -EINVAL;
525 }
526 if (rdev->sb_loaded)
527 return 0;
528
529
0002b271 530 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
1da177e4
LT		 531 goto fail;
532 rdev->sb_loaded = 1;
533 return 0;
534
535fail:
536 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
537 bdevname(rdev->bdev,b));
538 return -EINVAL;
539}
540
541static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
542{
543 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
544 (sb1->set_uuid1 == sb2->set_uuid1) &&
545 (sb1->set_uuid2 == sb2->set_uuid2) &&
546 (sb1->set_uuid3 == sb2->set_uuid3))
547
548 return 1;
549
550 return 0;
551}
552
553
554static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
555{
556 int ret;
557 mdp_super_t *tmp1, *tmp2;
558
559 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
560 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
561
562 if (!tmp1 || !tmp2) {
563 ret = 0;
564 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
565 goto abort;
566 }
567
568 *tmp1 = *sb1;
569 *tmp2 = *sb2;
570
571 /*
572 * nr_disks is not constant
573 */
574 tmp1->nr_disks = 0;
575 tmp2->nr_disks = 0;
576
577 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
578 ret = 0;
579 else
580 ret = 1;
581
582abort:
990a8baf
JJ		 583 kfree(tmp1);
584 kfree(tmp2);
1da177e4
LT		 585 return ret;
586}
587
4d167f09
N		 588
589static u32 md_csum_fold(u32 csum)
590{
591 csum = (csum & 0xffff) + (csum >> 16);
592 return (csum & 0xffff) + (csum >> 16);
593}
594
1da177e4
LT		 595static unsigned int calc_sb_csum(mdp_super_t * sb)
596{
4d167f09
N		 597 u64 newcsum = 0;
598 u32 *sb32 = (u32*)sb;
599 int i;
1da177e4
LT		 600 unsigned int disk_csum, csum;
601
602 disk_csum = sb->sb_csum;
603 sb->sb_csum = 0;
4d167f09
N		 604
605 for (i = 0; i < MD_SB_BYTES/4 ; i++)
606 newcsum += sb32[i];
607 csum = (newcsum & 0xffffffff) + (newcsum>>32);
608
609
610#ifdef CONFIG_ALPHA
611 /* This used to use csum_partial, which was wrong for several
612 * reasons including that different results are returned on
613 * different architectures. It isn't critical that we get exactly
614 * the same return value as before (we always csum_fold before
615 * testing, and that removes any differences). However as we
616 * know that csum_partial always returned a 16bit value on
617 * alphas, do a fold to maximise conformity to previous behaviour.
618 */
619 sb->sb_csum = md_csum_fold(disk_csum);
620#else
1da177e4 621 sb->sb_csum = disk_csum;
4d167f09 622#endif
1da177e4
LT		 623 return csum;
624}
625
626
627/*
628 * Handle superblock details.
629 * We want to be able to handle multiple superblock formats
630 * so we have a common interface to them all, and an array of
631 * different handlers.
632 * We rely on user-space to write the initial superblock, and support
633 * reading and updating of superblocks.
634 * Interface methods are:
635 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
636 * loads and validates a superblock on dev.
637 * if refdev != NULL, compare superblocks on both devices
638 * Return:
639 * 0 - dev has a superblock that is compatible with refdev
640 * 1 - dev has a superblock that is compatible and newer than refdev
641 * so dev should be used as the refdev in future
642 * -EINVAL superblock incompatible or invalid
643 * -othererror e.g. -EIO
644 *
645 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
646 * Verify that dev is acceptable into mddev.
647 * The first time, mddev->raid_disks will be 0, and data from
648 * dev should be merged in. Subsequent calls check that dev
649 * is new enough. Return 0 or -EINVAL
650 *
651 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
652 * Update the superblock for rdev with data in mddev
653 * This does not write to disc.
654 *
655 */
656
657struct super_type {
658 char *name;
659 struct module *owner;
660 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
661 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
662 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
663};
664
665/*
666 * load_super for 0.90.0
667 */
668static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
669{
670 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
671 mdp_super_t *sb;
672 int ret;
673 sector_t sb_offset;
674
675 /*
676 * Calculate the position of the superblock,
677 * it's at the end of the disk.
678 *
679 * It also happens to be a multiple of 4Kb.
680 */
681 sb_offset = calc_dev_sboffset(rdev->bdev);
682 rdev->sb_offset = sb_offset;
683
0002b271 684 ret = read_disk_sb(rdev, MD_SB_BYTES);
1da177e4
LT		 685 if (ret) return ret;
686
687 ret = -EINVAL;
688
689 bdevname(rdev->bdev, b);
690 sb = (mdp_super_t*)page_address(rdev->sb_page);
691
692 if (sb->md_magic != MD_SB_MAGIC) {
693 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
694 b);
695 goto abort;
696 }
697
698 if (sb->major_version != 0 ||
f6705578
N		 699 sb->minor_version < 90 ||
700 sb->minor_version > 91) {
1da177e4
LT		 701 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
702 sb->major_version, sb->minor_version,
703 b);
704 goto abort;
705 }
706
707 if (sb->raid_disks <= 0)
708 goto abort;
709
4d167f09 710 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1da177e4
LT		 711 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
712 b);
713 goto abort;
714 }
715
716 rdev->preferred_minor = sb->md_minor;
717 rdev->data_offset = 0;
0002b271 718 rdev->sb_size = MD_SB_BYTES;
1da177e4 719
e11e93fa
N		 720 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
721 if (sb->level != 1 && sb->level != 4
722 && sb->level != 5 && sb->level != 6
723 && sb->level != 10) {
724 /* FIXME use a better test */
725 printk(KERN_WARNING
726 "md: bitmaps not supported for this level.\n");
727 goto abort;
728 }
729 }
730
1da177e4
LT		 731 if (sb->level == LEVEL_MULTIPATH)
732 rdev->desc_nr = -1;
733 else
734 rdev->desc_nr = sb->this_disk.number;
735
9a7b2b0f 736 if (!refdev) {
1da177e4 737 ret = 1;
9a7b2b0f 738 } else {
1da177e4
LT		 739 __u64 ev1, ev2;
740 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
741 if (!uuid_equal(refsb, sb)) {
742 printk(KERN_WARNING "md: %s has different UUID to %s\n",
743 b, bdevname(refdev->bdev,b2));
744 goto abort;
745 }
746 if (!sb_equal(refsb, sb)) {
747 printk(KERN_WARNING "md: %s has same UUID"
748 " but different superblock to %s\n",
749 b, bdevname(refdev->bdev, b2));
750 goto abort;
751 }
752 ev1 = md_event(sb);
753 ev2 = md_event(refsb);
754 if (ev1 > ev2)
755 ret = 1;
756 else
757 ret = 0;
758 }
759 rdev->size = calc_dev_size(rdev, sb->chunk_size);
760
2bf071bf
N		 761 if (rdev->size < sb->size && sb->level > 1)
762 /* "this cannot possibly happen" ... */
763 ret = -EINVAL;
764
1da177e4
LT		 765 abort:
766 return ret;
767}
768
769/*
770 * validate_super for 0.90.0
771 */
772static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
773{
774 mdp_disk_t *desc;
775 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
07d84d10 776 __u64 ev1 = md_event(sb);
1da177e4 777
41158c7e 778 rdev->raid_disk = -1;
c5d79adb
N		 779 clear_bit(Faulty, &rdev->flags);
780 clear_bit(In_sync, &rdev->flags);
781 clear_bit(WriteMostly, &rdev->flags);
782 clear_bit(BarriersNotsupp, &rdev->flags);
783
1da177e4
LT		 784 if (mddev->raid_disks == 0) {
785 mddev->major_version = 0;
786 mddev->minor_version = sb->minor_version;
787 mddev->patch_version = sb->patch_version;
e691063a 788 mddev->external = 0;
1da177e4
LT		 789 mddev->chunk_size = sb->chunk_size;
790 mddev->ctime = sb->ctime;
791 mddev->utime = sb->utime;
792 mddev->level = sb->level;
d9d166c2 793 mddev->clevel[0] = 0;
1da177e4
LT		 794 mddev->layout = sb->layout;
795 mddev->raid_disks = sb->raid_disks;
796 mddev->size = sb->size;
07d84d10 797 mddev->events = ev1;
9223214e 798 mddev->bitmap_offset = 0;
36fa3063 799 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
1da177e4 800
f6705578
N		 801 if (mddev->minor_version >= 91) {
802 mddev->reshape_position = sb->reshape_position;
803 mddev->delta_disks = sb->delta_disks;
804 mddev->new_level = sb->new_level;
805 mddev->new_layout = sb->new_layout;
806 mddev->new_chunk = sb->new_chunk;
807 } else {
808 mddev->reshape_position = MaxSector;
809 mddev->delta_disks = 0;
810 mddev->new_level = mddev->level;
811 mddev->new_layout = mddev->layout;
812 mddev->new_chunk = mddev->chunk_size;
813 }
814
1da177e4
LT		 815 if (sb->state & (1<<MD_SB_CLEAN))
816 mddev->recovery_cp = MaxSector;
817 else {
818 if (sb->events_hi == sb->cp_events_hi &&
819 sb->events_lo == sb->cp_events_lo) {
820 mddev->recovery_cp = sb->recovery_cp;
821 } else
822 mddev->recovery_cp = 0;
823 }
824
825 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
826 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
827 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
828 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
829
830 mddev->max_disks = MD_SB_DISKS;
a654b9d8
N		 831
832 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
e11e93fa 833 mddev->bitmap_file == NULL)
36fa3063 834 mddev->bitmap_offset = mddev->default_bitmap_offset;
a654b9d8 835
41158c7e
N		 836 } else if (mddev->pers == NULL) {
837 /* Insist on good event counter while assembling */
1da177e4
LT		 838 ++ev1;
839 if (ev1 < mddev->events)
840 return -EINVAL;
41158c7e
N		 841 } else if (mddev->bitmap) {
842 /* if adding to array with a bitmap, then we can accept an
843 * older device ... but not too old.
844 */
41158c7e
N		 845 if (ev1 < mddev->bitmap->events_cleared)
846 return 0;
07d84d10
N		 847 } else {
848 if (ev1 < mddev->events)
849 /* just a hot-add of a new device, leave raid_disk at -1 */
850 return 0;
851 }
41158c7e 852
1da177e4 853 if (mddev->level != LEVEL_MULTIPATH) {
1da177e4
LT		 854 desc = sb->disks + rdev->desc_nr;
855
856 if (desc->state & (1<<MD_DISK_FAULTY))
b2d444d7 857 set_bit(Faulty, &rdev->flags);
7c7546cc
N		 858 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
859 desc->raid_disk < mddev->raid_disks */) {
b2d444d7 860 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 861 rdev->raid_disk = desc->raid_disk;
862 }
8ddf9efe
N		 863 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
864 set_bit(WriteMostly, &rdev->flags);
41158c7e 865 } else /* MULTIPATH are always insync */
b2d444d7 866 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 867 return 0;
868}
869
870/*
871 * sync_super for 0.90.0
872 */
873static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
874{
875 mdp_super_t *sb;
876 struct list_head *tmp;
877 mdk_rdev_t *rdev2;
878 int next_spare = mddev->raid_disks;
19133a42 879
1da177e4
LT		 880
881 /* make rdev->sb match mddev data..
882 *
883 * 1/ zero out disks
884 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
885 * 3/ any empty disks < next_spare become removed
886 *
887 * disks[0] gets initialised to REMOVED because
888 * we cannot be sure from other fields if it has
889 * been initialised or not.
890 */
891 int i;
892 int active=0, working=0,failed=0,spare=0,nr_disks=0;
893
61181565
N		 894 rdev->sb_size = MD_SB_BYTES;
895
1da177e4
LT		 896 sb = (mdp_super_t*)page_address(rdev->sb_page);
897
898 memset(sb, 0, sizeof(*sb));
899
900 sb->md_magic = MD_SB_MAGIC;
901 sb->major_version = mddev->major_version;
1da177e4
LT		 902 sb->patch_version = mddev->patch_version;
903 sb->gvalid_words = 0; /* ignored */
904 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
905 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
906 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
907 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
908
909 sb->ctime = mddev->ctime;
910 sb->level = mddev->level;
911 sb->size = mddev->size;
912 sb->raid_disks = mddev->raid_disks;
913 sb->md_minor = mddev->md_minor;
e691063a 914 sb->not_persistent = 0;
1da177e4
LT		 915 sb->utime = mddev->utime;
916 sb->state = 0;
917 sb->events_hi = (mddev->events>>32);
918 sb->events_lo = (u32)mddev->events;
919
f6705578
N		 920 if (mddev->reshape_position == MaxSector)
921 sb->minor_version = 90;
922 else {
923 sb->minor_version = 91;
924 sb->reshape_position = mddev->reshape_position;
925 sb->new_level = mddev->new_level;
926 sb->delta_disks = mddev->delta_disks;
927 sb->new_layout = mddev->new_layout;
928 sb->new_chunk = mddev->new_chunk;
929 }
930 mddev->minor_version = sb->minor_version;
1da177e4
LT		 931 if (mddev->in_sync)
932 {
933 sb->recovery_cp = mddev->recovery_cp;
934 sb->cp_events_hi = (mddev->events>>32);
935 sb->cp_events_lo = (u32)mddev->events;
936 if (mddev->recovery_cp == MaxSector)
937 sb->state = (1<< MD_SB_CLEAN);
938 } else
939 sb->recovery_cp = 0;
940
941 sb->layout = mddev->layout;
942 sb->chunk_size = mddev->chunk_size;
943
a654b9d8
N		 944 if (mddev->bitmap && mddev->bitmap_file == NULL)
945 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
946
1da177e4 947 sb->disks[0].state = (1<<MD_DISK_REMOVED);
d089c6af 948 rdev_for_each(rdev2, tmp, mddev) {
1da177e4 949 mdp_disk_t *d;
86e6ffdd 950 int desc_nr;
b2d444d7
N		 951 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
952 && !test_bit(Faulty, &rdev2->flags))
86e6ffdd 953 desc_nr = rdev2->raid_disk;
1da177e4 954 else
86e6ffdd 955 desc_nr = next_spare++;
19133a42 956 rdev2->desc_nr = desc_nr;
1da177e4
LT		 957 d = &sb->disks[rdev2->desc_nr];
958 nr_disks++;
959 d->number = rdev2->desc_nr;
960 d->major = MAJOR(rdev2->bdev->bd_dev);
961 d->minor = MINOR(rdev2->bdev->bd_dev);
b2d444d7
N		 962 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
963 && !test_bit(Faulty, &rdev2->flags))
1da177e4
LT		 964 d->raid_disk = rdev2->raid_disk;
965 else
966 d->raid_disk = rdev2->desc_nr; /* compatibility */
1be7892f 967 if (test_bit(Faulty, &rdev2->flags))
1da177e4 968 d->state = (1<<MD_DISK_FAULTY);
1be7892f 969 else if (test_bit(In_sync, &rdev2->flags)) {
1da177e4
LT		 970 d->state = (1<<MD_DISK_ACTIVE);
971 d->state |= (1<<MD_DISK_SYNC);
972 active++;
973 working++;
974 } else {
975 d->state = 0;
976 spare++;
977 working++;
978 }
8ddf9efe
N		 979 if (test_bit(WriteMostly, &rdev2->flags))
980 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4 981 }
1da177e4
LT		 982 /* now set the "removed" and "faulty" bits on any missing devices */
983 for (i=0 ; i < mddev->raid_disks ; i++) {
984 mdp_disk_t *d = &sb->disks[i];
985 if (d->state == 0 && d->number == 0) {
986 d->number = i;
987 d->raid_disk = i;
988 d->state = (1<<MD_DISK_REMOVED);
989 d->state |= (1<<MD_DISK_FAULTY);
990 failed++;
991 }
992 }
993 sb->nr_disks = nr_disks;
994 sb->active_disks = active;
995 sb->working_disks = working;
996 sb->failed_disks = failed;
997 sb->spare_disks = spare;
998
999 sb->this_disk = sb->disks[rdev->desc_nr];
1000 sb->sb_csum = calc_sb_csum(sb);
1001}
1002
1003/*
1004 * version 1 superblock
1005 */
1006
1c05b4bc 1007static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1da177e4 1008{
1c05b4bc
N		 1009 __le32 disk_csum;
1010 u32 csum;
1da177e4
LT		 1011 unsigned long long newcsum;
1012 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1c05b4bc 1013 __le32 *isuper = (__le32*)sb;
1da177e4
LT		 1014 int i;
1015
1016 disk_csum = sb->sb_csum;
1017 sb->sb_csum = 0;
1018 newcsum = 0;
1019 for (i=0; size>=4; size -= 4 )
1020 newcsum += le32_to_cpu(*isuper++);
1021
1022 if (size == 2)
1c05b4bc 1023 newcsum += le16_to_cpu(*(__le16*) isuper);
1da177e4
LT		 1024
1025 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1026 sb->sb_csum = disk_csum;
1027 return cpu_to_le32(csum);
1028}
1029
1030static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1031{
1032 struct mdp_superblock_1 *sb;
1033 int ret;
1034 sector_t sb_offset;
1035 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 1036 int bmask;
1da177e4
LT		 1037
1038 /*
1039 * Calculate the position of the superblock.
1040 * It is always aligned to a 4K boundary and
1041 * depeding on minor_version, it can be:
1042 * 0: At least 8K, but less than 12K, from end of device
1043 * 1: At start of device
1044 * 2: 4K from start of device.
1045 */
1046 switch(minor_version) {
1047 case 0:
1048 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1049 sb_offset -= 8*2;
39730960 1050 sb_offset &= ~(sector_t)(4*2-1);
1da177e4
LT		 1051 /* convert from sectors to K */
1052 sb_offset /= 2;
1053 break;
1054 case 1:
1055 sb_offset = 0;
1056 break;
1057 case 2:
1058 sb_offset = 4;
1059 break;
1060 default:
1061 return -EINVAL;
1062 }
1063 rdev->sb_offset = sb_offset;
1064
0002b271
N		 1065 /* superblock is rarely larger than 1K, but it can be larger,
1066 * and it is safe to read 4k, so we do that
1067 */
1068 ret = read_disk_sb(rdev, 4096);
1da177e4
LT		 1069 if (ret) return ret;
1070
1071
1072 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1073
1074 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1075 sb->major_version != cpu_to_le32(1) ||
1076 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1077 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
71c0805c 1078 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT		 1079 return -EINVAL;
1080
1081 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1082 printk("md: invalid superblock checksum on %s\n",
1083 bdevname(rdev->bdev,b));
1084 return -EINVAL;
1085 }
1086 if (le64_to_cpu(sb->data_size) < 10) {
1087 printk("md: data_size too small on %s\n",
1088 bdevname(rdev->bdev,b));
1089 return -EINVAL;
1090 }
e11e93fa
N		 1091 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1092 if (sb->level != cpu_to_le32(1) &&
1093 sb->level != cpu_to_le32(4) &&
1094 sb->level != cpu_to_le32(5) &&
1095 sb->level != cpu_to_le32(6) &&
1096 sb->level != cpu_to_le32(10)) {
1097 printk(KERN_WARNING
1098 "md: bitmaps not supported for this level.\n");
1099 return -EINVAL;
1100 }
1101 }
1102
1da177e4
LT		 1103 rdev->preferred_minor = 0xffff;
1104 rdev->data_offset = le64_to_cpu(sb->data_offset);
4dbcdc75 1105 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1da177e4 1106
0002b271 1107 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
720a3dc3 1108 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
0002b271 1109 if (rdev->sb_size & bmask)
a1801f85
N		 1110 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1111
1112 if (minor_version
1113 && rdev->data_offset < sb_offset + (rdev->sb_size/512))
1114 return -EINVAL;
0002b271 1115
31b65a0d
N		 1116 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1117 rdev->desc_nr = -1;
1118 else
1119 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1120
9a7b2b0f 1121 if (!refdev) {
8ed75463 1122 ret = 1;
9a7b2b0f 1123 } else {
1da177e4
LT		 1124 __u64 ev1, ev2;
1125 struct mdp_superblock_1 *refsb =
1126 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1127
1128 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1129 sb->level != refsb->level ||
1130 sb->layout != refsb->layout ||
1131 sb->chunksize != refsb->chunksize) {
1132 printk(KERN_WARNING "md: %s has strangely different"
1133 " superblock to %s\n",
1134 bdevname(rdev->bdev,b),
1135 bdevname(refdev->bdev,b2));
1136 return -EINVAL;
1137 }
1138 ev1 = le64_to_cpu(sb->events);
1139 ev2 = le64_to_cpu(refsb->events);
1140
1141 if (ev1 > ev2)
8ed75463
N		 1142 ret = 1;
1143 else
1144 ret = 0;
1da177e4 1145 }
a1801f85 1146 if (minor_version)
1da177e4
LT		 1147 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1148 else
1149 rdev->size = rdev->sb_offset;
1150 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1151 return -EINVAL;
1152 rdev->size = le64_to_cpu(sb->data_size)/2;
1153 if (le32_to_cpu(sb->chunksize))
1154 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
2bf071bf 1155
1c05b4bc 1156 if (le64_to_cpu(sb->size) > rdev->size*2)
2bf071bf 1157 return -EINVAL;
8ed75463 1158 return ret;
1da177e4
LT		 1159}
1160
1161static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1162{
1163 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
07d84d10 1164 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4 1165
41158c7e 1166 rdev->raid_disk = -1;
c5d79adb
N		 1167 clear_bit(Faulty, &rdev->flags);
1168 clear_bit(In_sync, &rdev->flags);
1169 clear_bit(WriteMostly, &rdev->flags);
1170 clear_bit(BarriersNotsupp, &rdev->flags);
1171
1da177e4
LT		 1172 if (mddev->raid_disks == 0) {
1173 mddev->major_version = 1;
1174 mddev->patch_version = 0;
e691063a 1175 mddev->external = 0;
1da177e4
LT		 1176 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1177 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1178 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1179 mddev->level = le32_to_cpu(sb->level);
d9d166c2 1180 mddev->clevel[0] = 0;
1da177e4
LT		 1181 mddev->layout = le32_to_cpu(sb->layout);
1182 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1183 mddev->size = le64_to_cpu(sb->size)/2;
07d84d10 1184 mddev->events = ev1;
9223214e 1185 mddev->bitmap_offset = 0;
29fc7e3e 1186 mddev->default_bitmap_offset = 1024 >> 9;
1da177e4
LT		 1187
1188 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1189 memcpy(mddev->uuid, sb->set_uuid, 16);
1190
1191 mddev->max_disks = (4096-256)/2;
a654b9d8 1192
71c0805c 1193 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
e11e93fa 1194 mddev->bitmap_file == NULL )
a654b9d8 1195 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
e11e93fa 1196
f6705578
N		 1197 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1198 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1199 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1200 mddev->new_level = le32_to_cpu(sb->new_level);
1201 mddev->new_layout = le32_to_cpu(sb->new_layout);
1202 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1203 } else {
1204 mddev->reshape_position = MaxSector;
1205 mddev->delta_disks = 0;
1206 mddev->new_level = mddev->level;
1207 mddev->new_layout = mddev->layout;
1208 mddev->new_chunk = mddev->chunk_size;
1209 }
1210
41158c7e
N		 1211 } else if (mddev->pers == NULL) {
1212 /* Insist of good event counter while assembling */
1da177e4
LT		 1213 ++ev1;
1214 if (ev1 < mddev->events)
1215 return -EINVAL;
41158c7e
N		 1216 } else if (mddev->bitmap) {
1217 /* If adding to array with a bitmap, then we can accept an
1218 * older device, but not too old.
1219 */
41158c7e
N		 1220 if (ev1 < mddev->bitmap->events_cleared)
1221 return 0;
07d84d10
N		 1222 } else {
1223 if (ev1 < mddev->events)
1224 /* just a hot-add of a new device, leave raid_disk at -1 */
1225 return 0;
1226 }
1da177e4
LT		 1227 if (mddev->level != LEVEL_MULTIPATH) {
1228 int role;
1da177e4
LT		 1229 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1230 switch(role) {
1231 case 0xffff: /* spare */
1da177e4
LT		 1232 break;
1233 case 0xfffe: /* faulty */
b2d444d7 1234 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 1235 break;
1236 default:
5fd6c1dc
N		 1237 if ((le32_to_cpu(sb->feature_map) &
1238 MD_FEATURE_RECOVERY_OFFSET))
1239 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1240 else
1241 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1242 rdev->raid_disk = role;
1243 break;
1244 }
8ddf9efe
N		 1245 if (sb->devflags & WriteMostly1)
1246 set_bit(WriteMostly, &rdev->flags);
41158c7e 1247 } else /* MULTIPATH are always insync */
b2d444d7 1248 set_bit(In_sync, &rdev->flags);
41158c7e 1249
1da177e4
LT		 1250 return 0;
1251}
1252
1253static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1254{
1255 struct mdp_superblock_1 *sb;
1256 struct list_head *tmp;
1257 mdk_rdev_t *rdev2;
1258 int max_dev, i;
1259 /* make rdev->sb match mddev and rdev data. */
1260
1261 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1262
1263 sb->feature_map = 0;
1264 sb->pad0 = 0;
5fd6c1dc 1265 sb->recovery_offset = cpu_to_le64(0);
1da177e4
LT		 1266 memset(sb->pad1, 0, sizeof(sb->pad1));
1267 memset(sb->pad2, 0, sizeof(sb->pad2));
1268 memset(sb->pad3, 0, sizeof(sb->pad3));
1269
1270 sb->utime = cpu_to_le64((__u64)mddev->utime);
1271 sb->events = cpu_to_le64(mddev->events);
1272 if (mddev->in_sync)
1273 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1274 else
1275 sb->resync_offset = cpu_to_le64(0);
1276
1c05b4bc 1277 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
4dbcdc75 1278
f0ca340c 1279 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
29fc7e3e 1280 sb->size = cpu_to_le64(mddev->size<<1);
f0ca340c 1281
a654b9d8
N		 1282 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1283 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
71c0805c 1284 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8 1285 }
5fd6c1dc
N		 1286
1287 if (rdev->raid_disk >= 0 &&
1288 !test_bit(In_sync, &rdev->flags) &&
1289 rdev->recovery_offset > 0) {
1290 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1291 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1292 }
1293
f6705578
N		 1294 if (mddev->reshape_position != MaxSector) {
1295 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1296 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1297 sb->new_layout = cpu_to_le32(mddev->new_layout);
1298 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1299 sb->new_level = cpu_to_le32(mddev->new_level);
1300 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1301 }
a654b9d8 1302
1da177e4 1303 max_dev = 0;
d089c6af 1304 rdev_for_each(rdev2, tmp, mddev)
1da177e4
LT		 1305 if (rdev2->desc_nr+1 > max_dev)
1306 max_dev = rdev2->desc_nr+1;
a778b73f
N		 1307
1308 if (max_dev > le32_to_cpu(sb->max_dev))
1309 sb->max_dev = cpu_to_le32(max_dev);
1da177e4
LT		 1310 for (i=0; i<max_dev;i++)
1311 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1312
d089c6af 1313 rdev_for_each(rdev2, tmp, mddev) {
1da177e4 1314 i = rdev2->desc_nr;
b2d444d7 1315 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1316 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1317 else if (test_bit(In_sync, &rdev2->flags))
1da177e4 1318 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
5fd6c1dc
N		 1319 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1320 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1da177e4
LT		 1321 else
1322 sb->dev_roles[i] = cpu_to_le16(0xffff);
1323 }
1324
1da177e4
LT		 1325 sb->sb_csum = calc_sb_1_csum(sb);
1326}
1327
1328
75c96f85 1329static struct super_type super_types[] = {
1da177e4
LT		 1330 [0] = {
1331 .name = "0.90.0",
1332 .owner = THIS_MODULE,
1333 .load_super = super_90_load,
1334 .validate_super = super_90_validate,
1335 .sync_super = super_90_sync,
1336 },
1337 [1] = {
1338 .name = "md-1",
1339 .owner = THIS_MODULE,
1340 .load_super = super_1_load,
1341 .validate_super = super_1_validate,
1342 .sync_super = super_1_sync,
1343 },
1344};
1da177e4
LT		 1345
1346static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1347{
7dd5e7c3
N		 1348 struct list_head *tmp, *tmp2;
1349 mdk_rdev_t *rdev, *rdev2;
1da177e4 1350
d089c6af
N		 1351 rdev_for_each(rdev, tmp, mddev1)
1352 rdev_for_each(rdev2, tmp2, mddev2)
7dd5e7c3
N		 1353 if (rdev->bdev->bd_contains ==
1354 rdev2->bdev->bd_contains)
1355 return 1;
1da177e4
LT		 1356
1357 return 0;
1358}
1359
1360static LIST_HEAD(pending_raid_disks);
1361
1362static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1363{
7dd5e7c3 1364 char b[BDEVNAME_SIZE];
f637b9f9 1365 struct kobject *ko;
1edf80d3 1366 char *s;
5e55e2f5 1367 int err;
1da177e4
LT		 1368
1369 if (rdev->mddev) {
1370 MD_BUG();
1371 return -EINVAL;
1372 }
2bf071bf
N		 1373 /* make sure rdev->size exceeds mddev->size */
1374 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
a778b73f
N		 1375 if (mddev->pers) {
1376 /* Cannot change size, so fail
1377 * If mddev->level <= 0, then we don't care
1378 * about aligning sizes (e.g. linear)
1379 */
1380 if (mddev->level > 0)
1381 return -ENOSPC;
1382 } else
2bf071bf
N		 1383 mddev->size = rdev->size;
1384 }
1da177e4
LT		 1385
1386 /* Verify rdev->desc_nr is unique.
1387 * If it is -1, assign a free number, else
1388 * check number is not in use
1389 */
1390 if (rdev->desc_nr < 0) {
1391 int choice = 0;
1392 if (mddev->pers) choice = mddev->raid_disks;
1393 while (find_rdev_nr(mddev, choice))
1394 choice++;
1395 rdev->desc_nr = choice;
1396 } else {
1397 if (find_rdev_nr(mddev, rdev->desc_nr))
1398 return -EBUSY;
1399 }
19133a42 1400 bdevname(rdev->bdev,b);
649316b2 1401 while ( (s=strchr(b, '/')) != NULL)
1edf80d3 1402 *s = '!';
649316b2 1403
1da177e4 1404 rdev->mddev = mddev;
19133a42 1405 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 1406
b2d6db58 1407 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
5e55e2f5 1408 goto fail;
86e6ffdd 1409
f637b9f9 1410 if (rdev->bdev->bd_part)
edfaa7c3 1411 ko = &rdev->bdev->bd_part->dev.kobj;
f637b9f9 1412 else
edfaa7c3 1413 ko = &rdev->bdev->bd_disk->dev.kobj;
5e55e2f5
N		 1414 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1415 kobject_del(&rdev->kobj);
1416 goto fail;
1417 }
1418 list_add(&rdev->same_set, &mddev->disks);
c5d79adb 1419 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1da177e4 1420 return 0;
5e55e2f5
N		 1421
1422 fail:
1423 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1424 b, mdname(mddev));
1425 return err;
1da177e4
LT		 1426}
1427
177a99b2 1428static void md_delayed_delete(struct work_struct *ws)
5792a285
N		 1429{
1430 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1431 kobject_del(&rdev->kobj);
177a99b2 1432 kobject_put(&rdev->kobj);
5792a285
N		 1433}
1434
1da177e4
LT		 1435static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1436{
1437 char b[BDEVNAME_SIZE];
1438 if (!rdev->mddev) {
1439 MD_BUG();
1440 return;
1441 }
5463c790 1442 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1da177e4
LT		 1443 list_del_init(&rdev->same_set);
1444 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1445 rdev->mddev = NULL;
86e6ffdd 1446 sysfs_remove_link(&rdev->kobj, "block");
5792a285
N		 1447
1448 /* We need to delay this, otherwise we can deadlock when
1449 * writing to 'remove' to "dev/state"
1450 */
177a99b2
N		 1451 INIT_WORK(&rdev->del_work, md_delayed_delete);
1452 kobject_get(&rdev->kobj);
5792a285 1453 schedule_work(&rdev->del_work);
1da177e4
LT		 1454}
1455
1456/*
1457 * prevent the device from being mounted, repartitioned or
1458 * otherwise reused by a RAID array (or any other kernel
1459 * subsystem), by bd_claiming the device.
1460 */
c5d79adb 1461static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1da177e4
LT		 1462{
1463 int err = 0;
1464 struct block_device *bdev;
1465 char b[BDEVNAME_SIZE];
1466
2e7b651d 1467 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1da177e4
LT		 1468 if (IS_ERR(bdev)) {
1469 printk(KERN_ERR "md: could not open %s.\n",
1470 __bdevname(dev, b));
1471 return PTR_ERR(bdev);
1472 }
c5d79adb 1473 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1da177e4
LT		 1474 if (err) {
1475 printk(KERN_ERR "md: could not bd_claim %s.\n",
1476 bdevname(bdev, b));
2e7b651d 1477 blkdev_put(bdev);
1da177e4
LT		 1478 return err;
1479 }
c5d79adb
N		 1480 if (!shared)
1481 set_bit(AllReserved, &rdev->flags);
1da177e4
LT		 1482 rdev->bdev = bdev;
1483 return err;
1484}
1485
1486static void unlock_rdev(mdk_rdev_t *rdev)
1487{
1488 struct block_device *bdev = rdev->bdev;
1489 rdev->bdev = NULL;
1490 if (!bdev)
1491 MD_BUG();
1492 bd_release(bdev);
2e7b651d 1493 blkdev_put(bdev);
1da177e4
LT		 1494}
1495
1496void md_autodetect_dev(dev_t dev);
1497
1498static void export_rdev(mdk_rdev_t * rdev)
1499{
1500 char b[BDEVNAME_SIZE];
1501 printk(KERN_INFO "md: export_rdev(%s)\n",
1502 bdevname(rdev->bdev,b));
1503 if (rdev->mddev)
1504 MD_BUG();
1505 free_disk_sb(rdev);
1506 list_del_init(&rdev->same_set);
1507#ifndef MODULE
d0fae18f
N		 1508 if (test_bit(AutoDetected, &rdev->flags))
1509 md_autodetect_dev(rdev->bdev->bd_dev);
1da177e4
LT		 1510#endif
1511 unlock_rdev(rdev);
86e6ffdd 1512 kobject_put(&rdev->kobj);
1da177e4
LT		 1513}
1514
1515static void kick_rdev_from_array(mdk_rdev_t * rdev)
1516{
1517 unbind_rdev_from_array(rdev);
1518 export_rdev(rdev);
1519}
1520
1521static void export_array(mddev_t *mddev)
1522{
1523 struct list_head *tmp;
1524 mdk_rdev_t *rdev;
1525
d089c6af 1526 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 1527 if (!rdev->mddev) {
1528 MD_BUG();
1529 continue;
1530 }
1531 kick_rdev_from_array(rdev);
1532 }
1533 if (!list_empty(&mddev->disks))
1534 MD_BUG();
1535 mddev->raid_disks = 0;
1536 mddev->major_version = 0;
1537}
1538
1539static void print_desc(mdp_disk_t *desc)
1540{
1541 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1542 desc->major,desc->minor,desc->raid_disk,desc->state);
1543}
1544
1545static void print_sb(mdp_super_t *sb)
1546{
1547 int i;
1548
1549 printk(KERN_INFO
1550 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1551 sb->major_version, sb->minor_version, sb->patch_version,
1552 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1553 sb->ctime);
1554 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1555 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1556 sb->md_minor, sb->layout, sb->chunk_size);
1557 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1558 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1559 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1560 sb->failed_disks, sb->spare_disks,
1561 sb->sb_csum, (unsigned long)sb->events_lo);
1562
1563 printk(KERN_INFO);
1564 for (i = 0; i < MD_SB_DISKS; i++) {
1565 mdp_disk_t *desc;
1566
1567 desc = sb->disks + i;
1568 if (desc->number || desc->major || desc->minor ||
1569 desc->raid_disk || (desc->state && (desc->state != 4))) {
1570 printk(" D %2d: ", i);
1571 print_desc(desc);
1572 }
1573 }
1574 printk(KERN_INFO "md: THIS: ");
1575 print_desc(&sb->this_disk);
1576
1577}
1578
1579static void print_rdev(mdk_rdev_t *rdev)
1580{
1581 char b[BDEVNAME_SIZE];
1582 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1583 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
b2d444d7
N		 1584 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1585 rdev->desc_nr);
1da177e4
LT		 1586 if (rdev->sb_loaded) {
1587 printk(KERN_INFO "md: rdev superblock:\n");
1588 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1589 } else
1590 printk(KERN_INFO "md: no rdev superblock!\n");
1591}
1592
5e56341d 1593static void md_print_devices(void)
1da177e4
LT		 1594{
1595 struct list_head *tmp, *tmp2;
1596 mdk_rdev_t *rdev;
1597 mddev_t *mddev;
1598 char b[BDEVNAME_SIZE];
1599
1600 printk("\n");
1601 printk("md: **********************************\n");
1602 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1603 printk("md: **********************************\n");
29ac4aa3 1604 for_each_mddev(mddev, tmp) {
1da177e4 1605
32a7627c
N		 1606 if (mddev->bitmap)
1607 bitmap_print_sb(mddev->bitmap);
1608 else
1609 printk("%s: ", mdname(mddev));
d089c6af 1610 rdev_for_each(rdev, tmp2, mddev)
1da177e4
LT		 1611 printk("<%s>", bdevname(rdev->bdev,b));
1612 printk("\n");
1613
d089c6af 1614 rdev_for_each(rdev, tmp2, mddev)
1da177e4
LT		 1615 print_rdev(rdev);
1616 }
1617 printk("md: **********************************\n");
1618 printk("\n");
1619}
1620
1621
42543769 1622static void sync_sbs(mddev_t * mddev, int nospares)
1da177e4 1623{
42543769
N		 1624 /* Update each superblock (in-memory image), but
1625 * if we are allowed to, skip spares which already
1626 * have the right event counter, or have one earlier
1627 * (which would mean they aren't being marked as dirty
1628 * with the rest of the array)
1629 */
1da177e4
LT		 1630 mdk_rdev_t *rdev;
1631 struct list_head *tmp;
1632
d089c6af 1633 rdev_for_each(rdev, tmp, mddev) {
42543769
N		 1634 if (rdev->sb_events == mddev->events ||
1635 (nospares &&
1636 rdev->raid_disk < 0 &&
1637 (rdev->sb_events&1)==0 &&
1638 rdev->sb_events+1 == mddev->events)) {
1639 /* Don't update this superblock */
1640 rdev->sb_loaded = 2;
1641 } else {
1642 super_types[mddev->major_version].
1643 sync_super(mddev, rdev);
1644 rdev->sb_loaded = 1;
1645 }
1da177e4
LT		 1646 }
1647}
1648
850b2b42 1649static void md_update_sb(mddev_t * mddev, int force_change)
1da177e4 1650{
1da177e4
LT		 1651 struct list_head *tmp;
1652 mdk_rdev_t *rdev;
06d91a5f 1653 int sync_req;
42543769 1654 int nospares = 0;
1da177e4 1655
8377bc80
N		 1656 if (mddev->external)
1657 return;
1da177e4 1658repeat:
a9701a30 1659 spin_lock_irq(&mddev->write_lock);
84692195 1660
850b2b42
N		 1661 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1662 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1663 force_change = 1;
1664 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1665 /* just a clean<-> dirty transition, possibly leave spares alone,
1666 * though if events isn't the right even/odd, we will have to do
1667 * spares after all
1668 */
1669 nospares = 1;
1670 if (force_change)
1671 nospares = 0;
1672 if (mddev->degraded)
84692195
N		 1673 /* If the array is degraded, then skipping spares is both
1674 * dangerous and fairly pointless.
1675 * Dangerous because a device that was removed from the array
1676 * might have a event_count that still looks up-to-date,
1677 * so it can be re-added without a resync.
1678 * Pointless because if there are any spares to skip,
1679 * then a recovery will happen and soon that array won't
1680 * be degraded any more and the spare can go back to sleep then.
1681 */
850b2b42 1682 nospares = 0;
84692195 1683
06d91a5f 1684 sync_req = mddev->in_sync;
1da177e4 1685 mddev->utime = get_seconds();
42543769
N		 1686
1687 /* If this is just a dirty<->clean transition, and the array is clean
1688 * and 'events' is odd, we can roll back to the previous clean state */
850b2b42 1689 if (nospares
42543769 1690 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1031be7a
N		 1691 && (mddev->events & 1)
1692 && mddev->events != 1)
42543769
N		 1693 mddev->events--;
1694 else {
1695 /* otherwise we have to go forward and ... */
1696 mddev->events ++;
1697 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1698 /* .. if the array isn't clean, insist on an odd 'events' */
1699 if ((mddev->events&1)==0) {
1700 mddev->events++;
1701 nospares = 0;
1702 }
1703 } else {
1704 /* otherwise insist on an even 'events' (for clean states) */
1705 if ((mddev->events&1)) {
1706 mddev->events++;
1707 nospares = 0;
1708 }
1709 }
1710 }
1da177e4
LT		 1711
1712 if (!mddev->events) {
1713 /*
1714 * oops, this 64-bit counter should never wrap.
1715 * Either we are in around ~1 trillion A.C., assuming
1716 * 1 reboot per second, or we have a bug:
1717 */
1718 MD_BUG();
1719 mddev->events --;
1720 }
1da177e4
LT		 1721
1722 /*
1723 * do not write anything to disk if using
1724 * nonpersistent superblocks
1725 */
06d91a5f 1726 if (!mddev->persistent) {
e691063a
N		 1727 if (!mddev->external)
1728 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1729
a9701a30 1730 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1731 wake_up(&mddev->sb_wait);
1da177e4 1732 return;
06d91a5f 1733 }
e691063a 1734 sync_sbs(mddev, nospares);
a9701a30 1735 spin_unlock_irq(&mddev->write_lock);
1da177e4
LT		 1736
1737 dprintk(KERN_INFO
1738 "md: updating %s RAID superblock on device (in sync %d)\n",
1739 mdname(mddev),mddev->in_sync);
1740
4ad13663 1741 bitmap_update_sb(mddev->bitmap);
d089c6af 1742 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 1743 char b[BDEVNAME_SIZE];
1744 dprintk(KERN_INFO "md: ");
42543769
N		 1745 if (rdev->sb_loaded != 1)
1746 continue; /* no noise on spare devices */
b2d444d7 1747 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1748 dprintk("(skipping faulty ");
1749
1750 dprintk("%s ", bdevname(rdev->bdev,b));
b2d444d7 1751 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 1752 md_super_write(mddev,rdev,
0002b271 1753 rdev->sb_offset<<1, rdev->sb_size,
7bfa19f2
N		 1754 rdev->sb_page);
1755 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1756 bdevname(rdev->bdev,b),
1757 (unsigned long long)rdev->sb_offset);
42543769 1758 rdev->sb_events = mddev->events;
7bfa19f2 1759
1da177e4
LT		 1760 } else
1761 dprintk(")\n");
7bfa19f2 1762 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT		 1763 /* only need to write one superblock... */
1764 break;
1765 }
a9701a30 1766 md_super_wait(mddev);
850b2b42 1767 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
7bfa19f2 1768
a9701a30 1769 spin_lock_irq(&mddev->write_lock);
850b2b42
N		 1770 if (mddev->in_sync != sync_req ||
1771 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
06d91a5f 1772 /* have to write it out again */
a9701a30 1773 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N		 1774 goto repeat;
1775 }
850b2b42 1776 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
a9701a30 1777 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1778 wake_up(&mddev->sb_wait);
06d91a5f 1779
1da177e4
LT		 1780}
1781
bce74dac
N		 1782/* words written to sysfs files may, or my not, be \n terminated.
1783 * We want to accept with case. For this we use cmd_match.
1784 */
1785static int cmd_match(const char *cmd, const char *str)
1786{
1787 /* See if cmd, written into a sysfs file, matches
1788 * str. They must either be the same, or cmd can
1789 * have a trailing newline
1790 */
1791 while (*cmd && *str && *cmd == *str) {
1792 cmd++;
1793 str++;
1794 }
1795 if (*cmd == '\n')
1796 cmd++;
1797 if (*str || *cmd)
1798 return 0;
1799 return 1;
1800}
1801
86e6ffdd
N		 1802struct rdev_sysfs_entry {
1803 struct attribute attr;
1804 ssize_t (*show)(mdk_rdev_t *, char *);
1805 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1806};
1807
1808static ssize_t
96de1e66 1809state_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1810{
1811 char *sep = "";
20a49ff6 1812 size_t len = 0;
86e6ffdd 1813
b2d444d7 1814 if (test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 1815 len+= sprintf(page+len, "%sfaulty",sep);
1816 sep = ",";
1817 }
b2d444d7 1818 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1819 len += sprintf(page+len, "%sin_sync",sep);
1820 sep = ",";
1821 }
f655675b
N		 1822 if (test_bit(WriteMostly, &rdev->flags)) {
1823 len += sprintf(page+len, "%swrite_mostly",sep);
1824 sep = ",";
1825 }
b2d444d7
N		 1826 if (!test_bit(Faulty, &rdev->flags) &&
1827 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1828 len += sprintf(page+len, "%sspare", sep);
1829 sep = ",";
1830 }
1831 return len+sprintf(page+len, "\n");
1832}
1833
45dc2de1
N		 1834static ssize_t
1835state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1836{
1837 /* can write
1838 * faulty - simulates and error
1839 * remove - disconnects the device
f655675b
N		 1840 * writemostly - sets write_mostly
1841 * -writemostly - clears write_mostly
45dc2de1
N		 1842 */
1843 int err = -EINVAL;
1844 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1845 md_error(rdev->mddev, rdev);
1846 err = 0;
1847 } else if (cmd_match(buf, "remove")) {
1848 if (rdev->raid_disk >= 0)
1849 err = -EBUSY;
1850 else {
1851 mddev_t *mddev = rdev->mddev;
1852 kick_rdev_from_array(rdev);
3f9d7b0d
N		 1853 if (mddev->pers)
1854 md_update_sb(mddev, 1);
45dc2de1
N		 1855 md_new_event(mddev);
1856 err = 0;
1857 }
f655675b
N		 1858 } else if (cmd_match(buf, "writemostly")) {
1859 set_bit(WriteMostly, &rdev->flags);
1860 err = 0;
1861 } else if (cmd_match(buf, "-writemostly")) {
1862 clear_bit(WriteMostly, &rdev->flags);
1863 err = 0;
45dc2de1
N		 1864 }
1865 return err ? err : len;
1866}
80ca3a44
N		 1867static struct rdev_sysfs_entry rdev_state =
1868__ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
86e6ffdd 1869
4dbcdc75
N		 1870static ssize_t
1871errors_show(mdk_rdev_t *rdev, char *page)
1872{
1873 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1874}
1875
1876static ssize_t
1877errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1878{
1879 char *e;
1880 unsigned long n = simple_strtoul(buf, &e, 10);
1881 if (*buf && (*e == 0 || *e == '\n')) {
1882 atomic_set(&rdev->corrected_errors, n);
1883 return len;
1884 }
1885 return -EINVAL;
1886}
1887static struct rdev_sysfs_entry rdev_errors =
80ca3a44 1888__ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
4dbcdc75 1889
014236d2
N		 1890static ssize_t
1891slot_show(mdk_rdev_t *rdev, char *page)
1892{
1893 if (rdev->raid_disk < 0)
1894 return sprintf(page, "none\n");
1895 else
1896 return sprintf(page, "%d\n", rdev->raid_disk);
1897}
1898
1899static ssize_t
1900slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1901{
1902 char *e;
c303da6d
N		 1903 int err;
1904 char nm[20];
014236d2
N		 1905 int slot = simple_strtoul(buf, &e, 10);
1906 if (strncmp(buf, "none", 4)==0)
1907 slot = -1;
1908 else if (e==buf || (*e && *e!= '\n'))
1909 return -EINVAL;
c303da6d
N		 1910 if (rdev->mddev->pers) {
1911 /* Setting 'slot' on an active array requires also
1912 * updating the 'rd%d' link, and communicating
1913 * with the personality with ->hot_*_disk.
1914 * For now we only support removing
1915 * failed/spare devices. This normally happens automatically,
1916 * but not when the metadata is externally managed.
1917 */
1918 if (slot != -1)
1919 return -EBUSY;
1920 if (rdev->raid_disk == -1)
1921 return -EEXIST;
1922 /* personality does all needed checks */
1923 if (rdev->mddev->pers->hot_add_disk == NULL)
1924 return -EINVAL;
1925 err = rdev->mddev->pers->
1926 hot_remove_disk(rdev->mddev, rdev->raid_disk);
1927 if (err)
1928 return err;
1929 sprintf(nm, "rd%d", rdev->raid_disk);
1930 sysfs_remove_link(&rdev->mddev->kobj, nm);
1931 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
1932 md_wakeup_thread(rdev->mddev->thread);
1933 } else {
1934 if (slot >= rdev->mddev->raid_disks)
1935 return -ENOSPC;
1936 rdev->raid_disk = slot;
1937 /* assume it is working */
c5d79adb
N		 1938 clear_bit(Faulty, &rdev->flags);
1939 clear_bit(WriteMostly, &rdev->flags);
c303da6d
N		 1940 set_bit(In_sync, &rdev->flags);
1941 }
014236d2
N		 1942 return len;
1943}
1944
1945
1946static struct rdev_sysfs_entry rdev_slot =
80ca3a44 1947__ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
014236d2 1948
93c8cad0
N		 1949static ssize_t
1950offset_show(mdk_rdev_t *rdev, char *page)
1951{
6961ece4 1952 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
93c8cad0
N		 1953}
1954
1955static ssize_t
1956offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1957{
1958 char *e;
1959 unsigned long long offset = simple_strtoull(buf, &e, 10);
1960 if (e==buf || (*e && *e != '\n'))
1961 return -EINVAL;
1962 if (rdev->mddev->pers)
1963 return -EBUSY;
c5d79adb
N		 1964 if (rdev->size && rdev->mddev->external)
1965 /* Must set offset before size, so overlap checks
1966 * can be sane */
1967 return -EBUSY;
93c8cad0
N		 1968 rdev->data_offset = offset;
1969 return len;
1970}
1971
1972static struct rdev_sysfs_entry rdev_offset =
80ca3a44 1973__ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
93c8cad0 1974
83303b61
N		 1975static ssize_t
1976rdev_size_show(mdk_rdev_t *rdev, char *page)
1977{
1978 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1979}
1980
c5d79adb
N		 1981static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
1982{
1983 /* check if two start/length pairs overlap */
1984 if (s1+l1 <= s2)
1985 return 0;
1986 if (s2+l2 <= s1)
1987 return 0;
1988 return 1;
1989}
1990
83303b61
N		 1991static ssize_t
1992rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1993{
1994 char *e;
1995 unsigned long long size = simple_strtoull(buf, &e, 10);
c5d79adb 1996 unsigned long long oldsize = rdev->size;
27c529bb
N		 1997 mddev_t *my_mddev = rdev->mddev;
1998
83303b61
N		 1999 if (e==buf || (*e && *e != '\n'))
2000 return -EINVAL;
27c529bb 2001 if (my_mddev->pers)
83303b61
N		 2002 return -EBUSY;
2003 rdev->size = size;
c5d79adb
N		 2004 if (size > oldsize && rdev->mddev->external) {
2005 /* need to check that all other rdevs with the same ->bdev
2006 * do not overlap. We need to unlock the mddev to avoid
2007 * a deadlock. We have already changed rdev->size, and if
2008 * we have to change it back, we will have the lock again.
2009 */
2010 mddev_t *mddev;
2011 int overlap = 0;
2012 struct list_head *tmp, *tmp2;
2013
27c529bb 2014 mddev_unlock(my_mddev);
29ac4aa3 2015 for_each_mddev(mddev, tmp) {
c5d79adb
N		 2016 mdk_rdev_t *rdev2;
2017
2018 mddev_lock(mddev);
d089c6af 2019 rdev_for_each(rdev2, tmp2, mddev)
c5d79adb
N		 2020 if (test_bit(AllReserved, &rdev2->flags) ||
2021 (rdev->bdev == rdev2->bdev &&
2022 rdev != rdev2 &&
2023 overlaps(rdev->data_offset, rdev->size,
2024 rdev2->data_offset, rdev2->size))) {
2025 overlap = 1;
2026 break;
2027 }
2028 mddev_unlock(mddev);
2029 if (overlap) {
2030 mddev_put(mddev);
2031 break;
2032 }
2033 }
27c529bb 2034 mddev_lock(my_mddev);
c5d79adb
N		 2035 if (overlap) {
2036 /* Someone else could have slipped in a size
2037 * change here, but doing so is just silly.
2038 * We put oldsize back because we *know* it is
2039 * safe, and trust userspace not to race with
2040 * itself
2041 */
2042 rdev->size = oldsize;
2043 return -EBUSY;
2044 }
2045 }
27c529bb
N		 2046 if (size < my_mddev->size || my_mddev->size == 0)
2047 my_mddev->size = size;
83303b61
N		 2048 return len;
2049}
2050
2051static struct rdev_sysfs_entry rdev_size =
80ca3a44 2052__ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
83303b61 2053
86e6ffdd
N		 2054static struct attribute *rdev_default_attrs[] = {
2055 &rdev_state.attr,
4dbcdc75 2056 &rdev_errors.attr,
014236d2 2057 &rdev_slot.attr,
93c8cad0 2058 &rdev_offset.attr,
83303b61 2059 &rdev_size.attr,
86e6ffdd
N		 2060 NULL,
2061};
2062static ssize_t
2063rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2064{
2065 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2066 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
27c529bb
N		 2067 mddev_t *mddev = rdev->mddev;
2068 ssize_t rv;
86e6ffdd
N		 2069
2070 if (!entry->show)
2071 return -EIO;
27c529bb
N		 2072
2073 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2074 if (!rv) {
2075 if (rdev->mddev == NULL)
2076 rv = -EBUSY;
2077 else
2078 rv = entry->show(rdev, page);
2079 mddev_unlock(mddev);
2080 }
2081 return rv;
86e6ffdd
N		 2082}
2083
2084static ssize_t
2085rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2086 const char *page, size_t length)
2087{
2088 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2089 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
27c529bb
N		 2090 ssize_t rv;
2091 mddev_t *mddev = rdev->mddev;
86e6ffdd
N		 2092
2093 if (!entry->store)
2094 return -EIO;
67463acb
N		 2095 if (!capable(CAP_SYS_ADMIN))
2096 return -EACCES;
27c529bb 2097 rv = mddev ? mddev_lock(mddev): -EBUSY;
ca388059 2098 if (!rv) {
27c529bb
N		 2099 if (rdev->mddev == NULL)
2100 rv = -EBUSY;
2101 else
2102 rv = entry->store(rdev, page, length);
6a51830e 2103 mddev_unlock(mddev);
ca388059
N		 2104 }
2105 return rv;
86e6ffdd
N		 2106}
2107
2108static void rdev_free(struct kobject *ko)
2109{
2110 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2111 kfree(rdev);
2112}
2113static struct sysfs_ops rdev_sysfs_ops = {
2114 .show = rdev_attr_show,
2115 .store = rdev_attr_store,
2116};
2117static struct kobj_type rdev_ktype = {
2118 .release = rdev_free,
2119 .sysfs_ops = &rdev_sysfs_ops,
2120 .default_attrs = rdev_default_attrs,
2121};
2122
1da177e4
LT		 2123/*
2124 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2125 *
2126 * mark the device faulty if:
2127 *
2128 * - the device is nonexistent (zero size)
2129 * - the device has no valid superblock
2130 *
2131 * a faulty rdev _never_ has rdev->sb set.
2132 */
2133static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2134{
2135 char b[BDEVNAME_SIZE];
2136 int err;
2137 mdk_rdev_t *rdev;
2138 sector_t size;
2139
9ffae0cf 2140 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1da177e4
LT		 2141 if (!rdev) {
2142 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2143 return ERR_PTR(-ENOMEM);
2144 }
1da177e4
LT		 2145
2146 if ((err = alloc_disk_sb(rdev)))
2147 goto abort_free;
2148
c5d79adb 2149 err = lock_rdev(rdev, newdev, super_format == -2);
1da177e4
LT		 2150 if (err)
2151 goto abort_free;
2152
f9cb074b 2153 kobject_init(&rdev->kobj, &rdev_ktype);
86e6ffdd 2154
1da177e4 2155 rdev->desc_nr = -1;
2b6e8459 2156 rdev->saved_raid_disk = -1;
3f9d7b0d 2157 rdev->raid_disk = -1;
b2d444d7 2158 rdev->flags = 0;
1da177e4 2159 rdev->data_offset = 0;
42543769 2160 rdev->sb_events = 0;
1da177e4 2161 atomic_set(&rdev->nr_pending, 0);
ba22dcbf 2162 atomic_set(&rdev->read_errors, 0);
4dbcdc75 2163 atomic_set(&rdev->corrected_errors, 0);
1da177e4
LT		 2164
2165 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2166 if (!size) {
2167 printk(KERN_WARNING
2168 "md: %s has zero or unknown size, marking faulty!\n",
2169 bdevname(rdev->bdev,b));
2170 err = -EINVAL;
2171 goto abort_free;
2172 }
2173
2174 if (super_format >= 0) {
2175 err = super_types[super_format].
2176 load_super(rdev, NULL, super_minor);
2177 if (err == -EINVAL) {
df968c4e
N		 2178 printk(KERN_WARNING
2179 "md: %s does not have a valid v%d.%d "
2180 "superblock, not importing!\n",
2181 bdevname(rdev->bdev,b),
2182 super_format, super_minor);
1da177e4
LT		 2183 goto abort_free;
2184 }
2185 if (err < 0) {
2186 printk(KERN_WARNING
2187 "md: could not read %s's sb, not importing!\n",
2188 bdevname(rdev->bdev,b));
2189 goto abort_free;
2190 }
2191 }
2192 INIT_LIST_HEAD(&rdev->same_set);
2193
2194 return rdev;
2195
2196abort_free:
2197 if (rdev->sb_page) {
2198 if (rdev->bdev)
2199 unlock_rdev(rdev);
2200 free_disk_sb(rdev);
2201 }
2202 kfree(rdev);
2203 return ERR_PTR(err);
2204}
2205
2206/*
2207 * Check a full RAID array for plausibility
2208 */
2209
2210
a757e64c 2211static void analyze_sbs(mddev_t * mddev)
1da177e4
LT		 2212{
2213 int i;
2214 struct list_head *tmp;
2215 mdk_rdev_t *rdev, *freshest;
2216 char b[BDEVNAME_SIZE];
2217
2218 freshest = NULL;
d089c6af 2219 rdev_for_each(rdev, tmp, mddev)
1da177e4
LT		 2220 switch (super_types[mddev->major_version].
2221 load_super(rdev, freshest, mddev->minor_version)) {
2222 case 1:
2223 freshest = rdev;
2224 break;
2225 case 0:
2226 break;
2227 default:
2228 printk( KERN_ERR \
2229 "md: fatal superblock inconsistency in %s"
2230 " -- removing from array\n",
2231 bdevname(rdev->bdev,b));
2232 kick_rdev_from_array(rdev);
2233 }
2234
2235
2236 super_types[mddev->major_version].
2237 validate_super(mddev, freshest);
2238
2239 i = 0;
d089c6af 2240 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 2241 if (rdev != freshest)
2242 if (super_types[mddev->major_version].
2243 validate_super(mddev, rdev)) {
2244 printk(KERN_WARNING "md: kicking non-fresh %s"
2245 " from array!\n",
2246 bdevname(rdev->bdev,b));
2247 kick_rdev_from_array(rdev);
2248 continue;
2249 }
2250 if (mddev->level == LEVEL_MULTIPATH) {
2251 rdev->desc_nr = i++;
2252 rdev->raid_disk = rdev->desc_nr;
b2d444d7 2253 set_bit(In_sync, &rdev->flags);
a778b73f
N		 2254 } else if (rdev->raid_disk >= mddev->raid_disks) {
2255 rdev->raid_disk = -1;
2256 clear_bit(In_sync, &rdev->flags);
1da177e4
LT		 2257 }
2258 }
2259
2260
2261
2262 if (mddev->recovery_cp != MaxSector &&
2263 mddev->level >= 1)
2264 printk(KERN_ERR "md: %s: raid array is not clean"
2265 " -- starting background reconstruction\n",
2266 mdname(mddev));
2267
1da177e4
LT		 2268}
2269
16f17b39
N		 2270static ssize_t
2271safe_delay_show(mddev_t *mddev, char *page)
2272{
2273 int msec = (mddev->safemode_delay*1000)/HZ;
2274 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2275}
2276static ssize_t
2277safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2278{
2279 int scale=1;
2280 int dot=0;
2281 int i;
2282 unsigned long msec;
2283 char buf[30];
2284 char *e;
2285 /* remove a period, and count digits after it */
2286 if (len >= sizeof(buf))
2287 return -EINVAL;
2288 strlcpy(buf, cbuf, len);
2289 buf[len] = 0;
2290 for (i=0; i<len; i++) {
2291 if (dot) {
2292 if (isdigit(buf[i])) {
2293 buf[i-1] = buf[i];
2294 scale *= 10;
2295 }
2296 buf[i] = 0;
2297 } else if (buf[i] == '.') {
2298 dot=1;
2299 buf[i] = 0;
2300 }
2301 }
2302 msec = simple_strtoul(buf, &e, 10);
2303 if (e == buf || (*e && *e != '\n'))
2304 return -EINVAL;
2305 msec = (msec * 1000) / scale;
2306 if (msec == 0)
2307 mddev->safemode_delay = 0;
2308 else {
2309 mddev->safemode_delay = (msec*HZ)/1000;
2310 if (mddev->safemode_delay == 0)
2311 mddev->safemode_delay = 1;
2312 }
2313 return len;
2314}
2315static struct md_sysfs_entry md_safe_delay =
80ca3a44 2316__ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
16f17b39 2317
eae1701f 2318static ssize_t
96de1e66 2319level_show(mddev_t *mddev, char *page)
eae1701f 2320{
2604b703 2321 struct mdk_personality *p = mddev->pers;
d9d166c2 2322 if (p)
eae1701f 2323 return sprintf(page, "%s\n", p->name);
d9d166c2
N		 2324 else if (mddev->clevel[0])
2325 return sprintf(page, "%s\n", mddev->clevel);
2326 else if (mddev->level != LEVEL_NONE)
2327 return sprintf(page, "%d\n", mddev->level);
2328 else
2329 return 0;
eae1701f
N		 2330}
2331
d9d166c2
N		 2332static ssize_t
2333level_store(mddev_t *mddev, const char *buf, size_t len)
2334{
20a49ff6 2335 ssize_t rv = len;
d9d166c2
N		 2336 if (mddev->pers)
2337 return -EBUSY;
2338 if (len == 0)
2339 return 0;
2340 if (len >= sizeof(mddev->clevel))
2341 return -ENOSPC;
2342 strncpy(mddev->clevel, buf, len);
2343 if (mddev->clevel[len-1] == '\n')
2344 len--;
2345 mddev->clevel[len] = 0;
2346 mddev->level = LEVEL_NONE;
2347 return rv;
2348}
2349
2350static struct md_sysfs_entry md_level =
80ca3a44 2351__ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
eae1701f 2352
d4dbd025
N		 2353
2354static ssize_t
2355layout_show(mddev_t *mddev, char *page)
2356{
2357 /* just a number, not meaningful for all levels */
08a02ecd
N		 2358 if (mddev->reshape_position != MaxSector &&
2359 mddev->layout != mddev->new_layout)
2360 return sprintf(page, "%d (%d)\n",
2361 mddev->new_layout, mddev->layout);
d4dbd025
N		 2362 return sprintf(page, "%d\n", mddev->layout);
2363}
2364
2365static ssize_t
2366layout_store(mddev_t *mddev, const char *buf, size_t len)
2367{
2368 char *e;
2369 unsigned long n = simple_strtoul(buf, &e, 10);
d4dbd025
N		 2370
2371 if (!*buf || (*e && *e != '\n'))
2372 return -EINVAL;
2373
08a02ecd
N		 2374 if (mddev->pers)
2375 return -EBUSY;
2376 if (mddev->reshape_position != MaxSector)
2377 mddev->new_layout = n;
2378 else
2379 mddev->layout = n;
d4dbd025
N		 2380 return len;
2381}
2382static struct md_sysfs_entry md_layout =
80ca3a44 2383__ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
d4dbd025
N		 2384
2385
eae1701f 2386static ssize_t
96de1e66 2387raid_disks_show(mddev_t *mddev, char *page)
eae1701f 2388{
bb636547
N		 2389 if (mddev->raid_disks == 0)
2390 return 0;
08a02ecd
N		 2391 if (mddev->reshape_position != MaxSector &&
2392 mddev->delta_disks != 0)
2393 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2394 mddev->raid_disks - mddev->delta_disks);
eae1701f
N		 2395 return sprintf(page, "%d\n", mddev->raid_disks);
2396}
2397
da943b99
N		 2398static int update_raid_disks(mddev_t *mddev, int raid_disks);
2399
2400static ssize_t
2401raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2402{
da943b99
N		 2403 char *e;
2404 int rv = 0;
2405 unsigned long n = simple_strtoul(buf, &e, 10);
2406
2407 if (!*buf || (*e && *e != '\n'))
2408 return -EINVAL;
2409
2410 if (mddev->pers)
2411 rv = update_raid_disks(mddev, n);
08a02ecd
N		 2412 else if (mddev->reshape_position != MaxSector) {
2413 int olddisks = mddev->raid_disks - mddev->delta_disks;
2414 mddev->delta_disks = n - olddisks;
2415 mddev->raid_disks = n;
2416 } else
da943b99
N		 2417 mddev->raid_disks = n;
2418 return rv ? rv : len;
2419}
2420static struct md_sysfs_entry md_raid_disks =
80ca3a44 2421__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
eae1701f 2422
3b34380a
N		 2423static ssize_t
2424chunk_size_show(mddev_t *mddev, char *page)
2425{
08a02ecd
N		 2426 if (mddev->reshape_position != MaxSector &&
2427 mddev->chunk_size != mddev->new_chunk)
2428 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2429 mddev->chunk_size);
3b34380a
N		 2430 return sprintf(page, "%d\n", mddev->chunk_size);
2431}
2432
2433static ssize_t
2434chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2435{
2436 /* can only set chunk_size if array is not yet active */
2437 char *e;
2438 unsigned long n = simple_strtoul(buf, &e, 10);
2439
3b34380a
N		 2440 if (!*buf || (*e && *e != '\n'))
2441 return -EINVAL;
2442
08a02ecd
N		 2443 if (mddev->pers)
2444 return -EBUSY;
2445 else if (mddev->reshape_position != MaxSector)
2446 mddev->new_chunk = n;
2447 else
2448 mddev->chunk_size = n;
3b34380a
N		 2449 return len;
2450}
2451static struct md_sysfs_entry md_chunk_size =
80ca3a44 2452__ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3b34380a 2453
a94213b1
N		 2454static ssize_t
2455resync_start_show(mddev_t *mddev, char *page)
2456{
2457 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2458}
2459
2460static ssize_t
2461resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2462{
2463 /* can only set chunk_size if array is not yet active */
2464 char *e;
2465 unsigned long long n = simple_strtoull(buf, &e, 10);
2466
2467 if (mddev->pers)
2468 return -EBUSY;
2469 if (!*buf || (*e && *e != '\n'))
2470 return -EINVAL;
2471
2472 mddev->recovery_cp = n;
2473 return len;
2474}
2475static struct md_sysfs_entry md_resync_start =
80ca3a44 2476__ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
a94213b1 2477
9e653b63
N		 2478/*
2479 * The array state can be:
2480 *
2481 * clear
2482 * No devices, no size, no level
2483 * Equivalent to STOP_ARRAY ioctl
2484 * inactive
2485 * May have some settings, but array is not active
2486 * all IO results in error
2487 * When written, doesn't tear down array, but just stops it
2488 * suspended (not supported yet)
2489 * All IO requests will block. The array can be reconfigured.
2490 * Writing this, if accepted, will block until array is quiessent
2491 * readonly
2492 * no resync can happen. no superblocks get written.
2493 * write requests fail
2494 * read-auto
2495 * like readonly, but behaves like 'clean' on a write request.
2496 *
2497 * clean - no pending writes, but otherwise active.
2498 * When written to inactive array, starts without resync
2499 * If a write request arrives then
2500 * if metadata is known, mark 'dirty' and switch to 'active'.
2501 * if not known, block and switch to write-pending
2502 * If written to an active array that has pending writes, then fails.
2503 * active
2504 * fully active: IO and resync can be happening.
2505 * When written to inactive array, starts with resync
2506 *
2507 * write-pending
2508 * clean, but writes are blocked waiting for 'active' to be written.
2509 *
2510 * active-idle
2511 * like active, but no writes have been seen for a while (100msec).
2512 *
2513 */
2514enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2515 write_pending, active_idle, bad_word};
05381954 2516static char *array_states[] = {
9e653b63
N		 2517 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2518 "write-pending", "active-idle", NULL };
2519
2520static int match_word(const char *word, char **list)
2521{
2522 int n;
2523 for (n=0; list[n]; n++)
2524 if (cmd_match(word, list[n]))
2525 break;
2526 return n;
2527}
2528
2529static ssize_t
2530array_state_show(mddev_t *mddev, char *page)
2531{
2532 enum array_state st = inactive;
2533
2534 if (mddev->pers)
2535 switch(mddev->ro) {
2536 case 1:
2537 st = readonly;
2538 break;
2539 case 2:
2540 st = read_auto;
2541 break;
2542 case 0:
2543 if (mddev->in_sync)
2544 st = clean;
e691063a
N		 2545 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
2546 st = write_pending;
9e653b63
N		 2547 else if (mddev->safemode)
2548 st = active_idle;
2549 else
2550 st = active;
2551 }
2552 else {
2553 if (list_empty(&mddev->disks) &&
2554 mddev->raid_disks == 0 &&
2555 mddev->size == 0)
2556 st = clear;
2557 else
2558 st = inactive;
2559 }
2560 return sprintf(page, "%s\n", array_states[st]);
2561}
2562
2563static int do_md_stop(mddev_t * mddev, int ro);
2564static int do_md_run(mddev_t * mddev);
2565static int restart_array(mddev_t *mddev);
2566
2567static ssize_t
2568array_state_store(mddev_t *mddev, const char *buf, size_t len)
2569{
2570 int err = -EINVAL;
2571 enum array_state st = match_word(buf, array_states);
2572 switch(st) {
2573 case bad_word:
2574 break;
2575 case clear:
2576 /* stopping an active array */
e691063a
N		 2577 if (atomic_read(&mddev->active) > 1)
2578 return -EBUSY;
2579 err = do_md_stop(mddev, 0);
9e653b63
N		 2580 break;
2581 case inactive:
2582 /* stopping an active array */
2583 if (mddev->pers) {
2584 if (atomic_read(&mddev->active) > 1)
2585 return -EBUSY;
2586 err = do_md_stop(mddev, 2);
e691063a
N		 2587 } else
2588 err = 0; /* already inactive */
9e653b63
N		 2589 break;
2590 case suspended:
2591 break; /* not supported yet */
2592 case readonly:
2593 if (mddev->pers)
2594 err = do_md_stop(mddev, 1);
2595 else {
2596 mddev->ro = 1;
2597 err = do_md_run(mddev);
2598 }
2599 break;
2600 case read_auto:
2601 /* stopping an active array */
2602 if (mddev->pers) {
2603 err = do_md_stop(mddev, 1);
2604 if (err == 0)
2605 mddev->ro = 2; /* FIXME mark devices writable */
2606 } else {
2607 mddev->ro = 2;
2608 err = do_md_run(mddev);
2609 }
2610 break;
2611 case clean:
2612 if (mddev->pers) {
2613 restart_array(mddev);
2614 spin_lock_irq(&mddev->write_lock);
2615 if (atomic_read(&mddev->writes_pending) == 0) {
e691063a
N		 2616 if (mddev->in_sync == 0) {
2617 mddev->in_sync = 1;
31a59e34
N		 2618 if (mddev->safemode == 1)
2619 mddev->safemode = 0;
e691063a
N		 2620 if (mddev->persistent)
2621 set_bit(MD_CHANGE_CLEAN,
2622 &mddev->flags);
2623 }
2624 err = 0;
2625 } else
2626 err = -EBUSY;
9e653b63
N		 2627 spin_unlock_irq(&mddev->write_lock);
2628 } else {
2629 mddev->ro = 0;
2630 mddev->recovery_cp = MaxSector;
2631 err = do_md_run(mddev);
2632 }
2633 break;
2634 case active:
2635 if (mddev->pers) {
2636 restart_array(mddev);
e691063a
N		 2637 if (mddev->external)
2638 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
9e653b63
N		 2639 wake_up(&mddev->sb_wait);
2640 err = 0;
2641 } else {
2642 mddev->ro = 0;
2643 err = do_md_run(mddev);
2644 }
2645 break;
2646 case write_pending:
2647 case active_idle:
2648 /* these cannot be set */
2649 break;
2650 }
2651 if (err)
2652 return err;
2653 else
2654 return len;
2655}
80ca3a44
N		 2656static struct md_sysfs_entry md_array_state =
2657__ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
9e653b63 2658
6d7ff738
N		 2659static ssize_t
2660null_show(mddev_t *mddev, char *page)
2661{
2662 return -EINVAL;
2663}
2664
2665static ssize_t
2666new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2667{
2668 /* buf must be %d:%d\n? giving major and minor numbers */
2669 /* The new device is added to the array.
2670 * If the array has a persistent superblock, we read the
2671 * superblock to initialise info and check validity.
2672 * Otherwise, only checking done is that in bind_rdev_to_array,
2673 * which mainly checks size.
2674 */
2675 char *e;
2676 int major = simple_strtoul(buf, &e, 10);
2677 int minor;
2678 dev_t dev;
2679 mdk_rdev_t *rdev;
2680 int err;
2681
2682 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2683 return -EINVAL;
2684 minor = simple_strtoul(e+1, &e, 10);
2685 if (*e && *e != '\n')
2686 return -EINVAL;
2687 dev = MKDEV(major, minor);
2688 if (major != MAJOR(dev) ||
2689 minor != MINOR(dev))
2690 return -EOVERFLOW;
2691
2692
2693 if (mddev->persistent) {
2694 rdev = md_import_device(dev, mddev->major_version,
2695 mddev->minor_version);
2696 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2697 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2698 mdk_rdev_t, same_set);
2699 err = super_types[mddev->major_version]
2700 .load_super(rdev, rdev0, mddev->minor_version);
2701 if (err < 0)
2702 goto out;
2703 }
c5d79adb
N		 2704 } else if (mddev->external)
2705 rdev = md_import_device(dev, -2, -1);
2706 else
6d7ff738
N		 2707 rdev = md_import_device(dev, -1, -1);
2708
2709 if (IS_ERR(rdev))
2710 return PTR_ERR(rdev);
2711 err = bind_rdev_to_array(rdev, mddev);
2712 out:
2713 if (err)
2714 export_rdev(rdev);
2715 return err ? err : len;
2716}
2717
2718static struct md_sysfs_entry md_new_device =
80ca3a44 2719__ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3b34380a 2720
9b1d1dac
PC		 2721static ssize_t
2722bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2723{
2724 char *end;
2725 unsigned long chunk, end_chunk;
2726
2727 if (!mddev->bitmap)
2728 goto out;
2729 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2730 while (*buf) {
2731 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2732 if (buf == end) break;
2733 if (*end == '-') { /* range */
2734 buf = end + 1;
2735 end_chunk = simple_strtoul(buf, &end, 0);
2736 if (buf == end) break;
2737 }
2738 if (*end && !isspace(*end)) break;
2739 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2740 buf = end;
2741 while (isspace(*buf)) buf++;
2742 }
2743 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2744out:
2745 return len;
2746}
2747
2748static struct md_sysfs_entry md_bitmap =
2749__ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2750
a35b0d69
N		 2751static ssize_t
2752size_show(mddev_t *mddev, char *page)
2753{
2754 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2755}
2756
2757static int update_size(mddev_t *mddev, unsigned long size);
2758
2759static ssize_t
2760size_store(mddev_t *mddev, const char *buf, size_t len)
2761{
2762 /* If array is inactive, we can reduce the component size, but
2763 * not increase it (except from 0).
2764 * If array is active, we can try an on-line resize
2765 */
2766 char *e;
2767 int err = 0;
2768 unsigned long long size = simple_strtoull(buf, &e, 10);
2769 if (!*buf || *buf == '\n' ||
2770 (*e && *e != '\n'))
2771 return -EINVAL;
2772
2773 if (mddev->pers) {
2774 err = update_size(mddev, size);
850b2b42 2775 md_update_sb(mddev, 1);
a35b0d69
N		 2776 } else {
2777 if (mddev->size == 0 ||
2778 mddev->size > size)
2779 mddev->size = size;
2780 else
2781 err = -ENOSPC;
2782 }
2783 return err ? err : len;
2784}
2785
2786static struct md_sysfs_entry md_size =
80ca3a44 2787__ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
a35b0d69 2788
8bb93aac
N		 2789
2790/* Metdata version.
e691063a
N		 2791 * This is one of
2792 * 'none' for arrays with no metadata (good luck...)
2793 * 'external' for arrays with externally managed metadata,
8bb93aac
N		 2794 * or N.M for internally known formats
2795 */
2796static ssize_t
2797metadata_show(mddev_t *mddev, char *page)
2798{
2799 if (mddev->persistent)
2800 return sprintf(page, "%d.%d\n",
2801 mddev->major_version, mddev->minor_version);
e691063a
N		 2802 else if (mddev->external)
2803 return sprintf(page, "external:%s\n", mddev->metadata_type);
8bb93aac
N		 2804 else
2805 return sprintf(page, "none\n");
2806}
2807
2808static ssize_t
2809metadata_store(mddev_t *mddev, const char *buf, size_t len)
2810{
2811 int major, minor;
2812 char *e;
2813 if (!list_empty(&mddev->disks))
2814 return -EBUSY;
2815
2816 if (cmd_match(buf, "none")) {
2817 mddev->persistent = 0;
e691063a
N		 2818 mddev->external = 0;
2819 mddev->major_version = 0;
2820 mddev->minor_version = 90;
2821 return len;
2822 }
2823 if (strncmp(buf, "external:", 9) == 0) {
20a49ff6 2824 size_t namelen = len-9;
e691063a
N		 2825 if (namelen >= sizeof(mddev->metadata_type))
2826 namelen = sizeof(mddev->metadata_type)-1;
2827 strncpy(mddev->metadata_type, buf+9, namelen);
2828 mddev->metadata_type[namelen] = 0;
2829 if (namelen && mddev->metadata_type[namelen-1] == '\n')
2830 mddev->metadata_type[--namelen] = 0;
2831 mddev->persistent = 0;
2832 mddev->external = 1;
8bb93aac
N		 2833 mddev->major_version = 0;
2834 mddev->minor_version = 90;
2835 return len;
2836 }
2837 major = simple_strtoul(buf, &e, 10);
2838 if (e==buf || *e != '.')
2839 return -EINVAL;
2840 buf = e+1;
2841 minor = simple_strtoul(buf, &e, 10);
3f9d7b0d 2842 if (e==buf || (*e && *e != '\n') )
8bb93aac 2843 return -EINVAL;
50511da3 2844 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
8bb93aac
N		 2845 return -ENOENT;
2846 mddev->major_version = major;
2847 mddev->minor_version = minor;
2848 mddev->persistent = 1;
e691063a 2849 mddev->external = 0;
8bb93aac
N		 2850 return len;
2851}
2852
2853static struct md_sysfs_entry md_metadata =
80ca3a44 2854__ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
8bb93aac 2855
24dd469d 2856static ssize_t
7eec314d 2857action_show(mddev_t *mddev, char *page)
24dd469d 2858{
7eec314d 2859 char *type = "idle";
31399d9e 2860 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2b12ab6d 2861 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
ccfcc3c1
N		 2862 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2863 type = "reshape";
2864 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N		 2865 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2866 type = "resync";
2867 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2868 type = "check";
2869 else
2870 type = "repair";
2871 } else
2872 type = "recover";
2873 }
2874 return sprintf(page, "%s\n", type);
2875}
2876
2877static ssize_t
7eec314d 2878action_store(mddev_t *mddev, const char *page, size_t len)
24dd469d 2879{
7eec314d
N		 2880 if (!mddev->pers || !mddev->pers->sync_request)
2881 return -EINVAL;
2882
bce74dac 2883 if (cmd_match(page, "idle")) {
7eec314d
N		 2884 if (mddev->sync_thread) {
2885 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2886 md_unregister_thread(mddev->sync_thread);
2887 mddev->sync_thread = NULL;
2888 mddev->recovery = 0;
2889 }
03c902e1
N		 2890 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2891 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 2892 return -EBUSY;
03c902e1 2893 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
7eec314d 2894 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
16484bf5
N		 2895 else if (cmd_match(page, "reshape")) {
2896 int err;
2897 if (mddev->pers->start_reshape == NULL)
2898 return -EINVAL;
2899 err = mddev->pers->start_reshape(mddev);
2900 if (err)
2901 return err;
2902 } else {
bce74dac 2903 if (cmd_match(page, "check"))
7eec314d 2904 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2adc7d47 2905 else if (!cmd_match(page, "repair"))
7eec314d
N		 2906 return -EINVAL;
2907 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2908 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7eec314d 2909 }
03c902e1 2910 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d
N		 2911 md_wakeup_thread(mddev->thread);
2912 return len;
2913}
2914
9d88883e 2915static ssize_t
96de1e66 2916mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 2917{
2918 return sprintf(page, "%llu\n",
2919 (unsigned long long) mddev->resync_mismatches);
2920}
2921
80ca3a44
N		 2922static struct md_sysfs_entry md_scan_mode =
2923__ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 2924
96de1e66 2925
80ca3a44 2926static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 2927
88202a0c
N		 2928static ssize_t
2929sync_min_show(mddev_t *mddev, char *page)
2930{
2931 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2932 mddev->sync_speed_min ? "local": "system");
2933}
2934
2935static ssize_t
2936sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2937{
2938 int min;
2939 char *e;
2940 if (strncmp(buf, "system", 6)==0) {
2941 mddev->sync_speed_min = 0;
2942 return len;
2943 }
2944 min = simple_strtoul(buf, &e, 10);
2945 if (buf == e || (*e && *e != '\n') || min <= 0)
2946 return -EINVAL;
2947 mddev->sync_speed_min = min;
2948 return len;
2949}
2950
2951static struct md_sysfs_entry md_sync_min =
2952__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2953
2954static ssize_t
2955sync_max_show(mddev_t *mddev, char *page)
2956{
2957 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2958 mddev->sync_speed_max ? "local": "system");
2959}
2960
2961static ssize_t
2962sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2963{
2964 int max;
2965 char *e;
2966 if (strncmp(buf, "system", 6)==0) {
2967 mddev->sync_speed_max = 0;
2968 return len;
2969 }
2970 max = simple_strtoul(buf, &e, 10);
2971 if (buf == e || (*e && *e != '\n') || max <= 0)
2972 return -EINVAL;
2973 mddev->sync_speed_max = max;
2974 return len;
2975}
2976
2977static struct md_sysfs_entry md_sync_max =
2978__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2979
d7f3d291
IP		 2980static ssize_t
2981degraded_show(mddev_t *mddev, char *page)
2982{
2983 return sprintf(page, "%d\n", mddev->degraded);
2984}
2985static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
88202a0c
N		 2986
2987static ssize_t
2988sync_speed_show(mddev_t *mddev, char *page)
2989{
2990 unsigned long resync, dt, db;
ff4e8d9a 2991 resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active));
88202a0c
N		 2992 dt = ((jiffies - mddev->resync_mark) / HZ);
2993 if (!dt) dt++;
2994 db = resync - (mddev->resync_mark_cnt);
2995 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2996}
2997
80ca3a44 2998static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
88202a0c
N		 2999
3000static ssize_t
3001sync_completed_show(mddev_t *mddev, char *page)
3002{
3003 unsigned long max_blocks, resync;
3004
3005 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3006 max_blocks = mddev->resync_max_sectors;
3007 else
3008 max_blocks = mddev->size << 1;
3009
3010 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
3011 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
3012}
3013
80ca3a44 3014static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
88202a0c 3015
c6207277
N		 3016static ssize_t
3017max_sync_show(mddev_t *mddev, char *page)
3018{
3019 if (mddev->resync_max == MaxSector)
3020 return sprintf(page, "max\n");
3021 else
3022 return sprintf(page, "%llu\n",
3023 (unsigned long long)mddev->resync_max);
3024}
3025static ssize_t
3026max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3027{
3028 if (strncmp(buf, "max", 3) == 0)
3029 mddev->resync_max = MaxSector;
3030 else {
3031 char *ep;
3032 unsigned long long max = simple_strtoull(buf, &ep, 10);
3033 if (ep == buf || (*ep != 0 && *ep != '\n'))
3034 return -EINVAL;
3035 if (max < mddev->resync_max &&
3036 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3037 return -EBUSY;
3038
3039 /* Must be a multiple of chunk_size */
3040 if (mddev->chunk_size) {
3041 if (max & (sector_t)((mddev->chunk_size>>9)-1))
3042 return -EINVAL;
3043 }
3044 mddev->resync_max = max;
3045 }
3046 wake_up(&mddev->recovery_wait);
3047 return len;
3048}
3049
3050static struct md_sysfs_entry md_max_sync =
3051__ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3052
e464eafd
N		 3053static ssize_t
3054suspend_lo_show(mddev_t *mddev, char *page)
3055{
3056 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3057}
3058
3059static ssize_t
3060suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3061{
3062 char *e;
3063 unsigned long long new = simple_strtoull(buf, &e, 10);
3064
3065 if (mddev->pers->quiesce == NULL)
3066 return -EINVAL;
3067 if (buf == e || (*e && *e != '\n'))
3068 return -EINVAL;
3069 if (new >= mddev->suspend_hi ||
3070 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3071 mddev->suspend_lo = new;
3072 mddev->pers->quiesce(mddev, 2);
3073 return len;
3074 } else
3075 return -EINVAL;
3076}
3077static struct md_sysfs_entry md_suspend_lo =
3078__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3079
3080
3081static ssize_t
3082suspend_hi_show(mddev_t *mddev, char *page)
3083{
3084 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3085}
3086
3087static ssize_t
3088suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3089{
3090 char *e;
3091 unsigned long long new = simple_strtoull(buf, &e, 10);
3092
3093 if (mddev->pers->quiesce == NULL)
3094 return -EINVAL;
3095 if (buf == e || (*e && *e != '\n'))
3096 return -EINVAL;
3097 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3098 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3099 mddev->suspend_hi = new;
3100 mddev->pers->quiesce(mddev, 1);
3101 mddev->pers->quiesce(mddev, 0);
3102 return len;
3103 } else
3104 return -EINVAL;
3105}
3106static struct md_sysfs_entry md_suspend_hi =
3107__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3108
08a02ecd
N		 3109static ssize_t
3110reshape_position_show(mddev_t *mddev, char *page)
3111{
3112 if (mddev->reshape_position != MaxSector)
3113 return sprintf(page, "%llu\n",
3114 (unsigned long long)mddev->reshape_position);
3115 strcpy(page, "none\n");
3116 return 5;
3117}
3118
3119static ssize_t
3120reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3121{
3122 char *e;
3123 unsigned long long new = simple_strtoull(buf, &e, 10);
3124 if (mddev->pers)
3125 return -EBUSY;
3126 if (buf == e || (*e && *e != '\n'))
3127 return -EINVAL;
3128 mddev->reshape_position = new;
3129 mddev->delta_disks = 0;
3130 mddev->new_level = mddev->level;
3131 mddev->new_layout = mddev->layout;
3132 mddev->new_chunk = mddev->chunk_size;
3133 return len;
3134}
3135
3136static struct md_sysfs_entry md_reshape_position =
3137__ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3138 reshape_position_store);
3139
e464eafd 3140
eae1701f
N		 3141static struct attribute *md_default_attrs[] = {
3142 &md_level.attr,
d4dbd025 3143 &md_layout.attr,
eae1701f 3144 &md_raid_disks.attr,
3b34380a 3145 &md_chunk_size.attr,
a35b0d69 3146 &md_size.attr,
a94213b1 3147 &md_resync_start.attr,
8bb93aac 3148 &md_metadata.attr,
6d7ff738 3149 &md_new_device.attr,
16f17b39 3150 &md_safe_delay.attr,
9e653b63 3151 &md_array_state.attr,
08a02ecd 3152 &md_reshape_position.attr,
411036fa
N		 3153 NULL,
3154};
3155
3156static struct attribute *md_redundancy_attrs[] = {
24dd469d 3157 &md_scan_mode.attr,
9d88883e 3158 &md_mismatches.attr,
88202a0c
N		 3159 &md_sync_min.attr,
3160 &md_sync_max.attr,
3161 &md_sync_speed.attr,
3162 &md_sync_completed.attr,
c6207277 3163 &md_max_sync.attr,
e464eafd
N		 3164 &md_suspend_lo.attr,
3165 &md_suspend_hi.attr,
9b1d1dac 3166 &md_bitmap.attr,
d7f3d291 3167 &md_degraded.attr,
eae1701f
N		 3168 NULL,
3169};
411036fa
N		 3170static struct attribute_group md_redundancy_group = {
3171 .name = NULL,
3172 .attrs = md_redundancy_attrs,
3173};
3174
eae1701f
N		 3175
3176static ssize_t
3177md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3178{
3179 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3180 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 3181 ssize_t rv;
eae1701f
N		 3182
3183 if (!entry->show)
3184 return -EIO;
5dc5cf7d
IM		 3185 rv = mddev_lock(mddev);
3186 if (!rv) {
3187 rv = entry->show(mddev, page);
3188 mddev_unlock(mddev);
3189 }
96de1e66 3190 return rv;
eae1701f
N		 3191}
3192
3193static ssize_t
3194md_attr_store(struct kobject *kobj, struct attribute *attr,
3195 const char *page, size_t length)
3196{
3197 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3198 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 3199 ssize_t rv;
eae1701f
N		 3200
3201 if (!entry->store)
3202 return -EIO;
67463acb
N		 3203 if (!capable(CAP_SYS_ADMIN))
3204 return -EACCES;
5dc5cf7d
IM		 3205 rv = mddev_lock(mddev);
3206 if (!rv) {
3207 rv = entry->store(mddev, page, length);
3208 mddev_unlock(mddev);
3209 }
96de1e66 3210 return rv;
eae1701f
N		 3211}
3212
3213static void md_free(struct kobject *ko)
3214{
3215 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3216 kfree(mddev);
3217}
3218
3219static struct sysfs_ops md_sysfs_ops = {
3220 .show = md_attr_show,
3221 .store = md_attr_store,
3222};
3223static struct kobj_type md_ktype = {
3224 .release = md_free,
3225 .sysfs_ops = &md_sysfs_ops,
3226 .default_attrs = md_default_attrs,
3227};
3228
1da177e4
LT		 3229int mdp_major = 0;
3230
3231static struct kobject *md_probe(dev_t dev, int *part, void *data)
3232{
48c9c27b 3233 static DEFINE_MUTEX(disks_mutex);
1da177e4
LT		 3234 mddev_t *mddev = mddev_find(dev);
3235 struct gendisk *disk;
3236 int partitioned = (MAJOR(dev) != MD_MAJOR);
3237 int shift = partitioned ? MdpMinorShift : 0;
3238 int unit = MINOR(dev) >> shift;
3830c62f 3239 int error;
1da177e4
LT		 3240
3241 if (!mddev)
3242 return NULL;
3243
48c9c27b 3244 mutex_lock(&disks_mutex);
1da177e4 3245 if (mddev->gendisk) {
48c9c27b 3246 mutex_unlock(&disks_mutex);
1da177e4
LT		 3247 mddev_put(mddev);
3248 return NULL;
3249 }
3250 disk = alloc_disk(1 << shift);
3251 if (!disk) {
48c9c27b 3252 mutex_unlock(&disks_mutex);
1da177e4
LT		 3253 mddev_put(mddev);
3254 return NULL;
3255 }
3256 disk->major = MAJOR(dev);
3257 disk->first_minor = unit << shift;
ce7b0f46 3258 if (partitioned)
1da177e4 3259 sprintf(disk->disk_name, "md_d%d", unit);
ce7b0f46 3260 else
1da177e4 3261 sprintf(disk->disk_name, "md%d", unit);
1da177e4
LT		 3262 disk->fops = &md_fops;
3263 disk->private_data = mddev;
3264 disk->queue = mddev->queue;
3265 add_disk(disk);
3266 mddev->gendisk = disk;
48c9c27b 3267 mutex_unlock(&disks_mutex);
edfaa7c3 3268 error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj,
3830c62f
GKH		 3269 "%s", "md");
3270 if (error)
5e55e2f5
N		 3271 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3272 disk->disk_name);
3830c62f
GKH		 3273 else
3274 kobject_uevent(&mddev->kobj, KOBJ_ADD);
1da177e4
LT		 3275 return NULL;
3276}
3277
1da177e4
LT		 3278static void md_safemode_timeout(unsigned long data)
3279{
3280 mddev_t *mddev = (mddev_t *) data;
3281
3282 mddev->safemode = 1;
3283 md_wakeup_thread(mddev->thread);
3284}
3285
6ff8d8ec 3286static int start_dirty_degraded;
1da177e4
LT		 3287
3288static int do_md_run(mddev_t * mddev)
3289{
2604b703 3290 int err;
1da177e4
LT		 3291 int chunk_size;
3292 struct list_head *tmp;
3293 mdk_rdev_t *rdev;
3294 struct gendisk *disk;
2604b703 3295 struct mdk_personality *pers;
1da177e4
LT		 3296 char b[BDEVNAME_SIZE];
3297
a757e64c
N		 3298 if (list_empty(&mddev->disks))
3299 /* cannot run an array with no devices.. */
1da177e4 3300 return -EINVAL;
1da177e4
LT		 3301
3302 if (mddev->pers)
3303 return -EBUSY;
3304
3305 /*
3306 * Analyze all RAID superblock(s)
3307 */
1ec4a939
N		 3308 if (!mddev->raid_disks) {
3309 if (!mddev->persistent)
3310 return -EINVAL;
a757e64c 3311 analyze_sbs(mddev);
1ec4a939 3312 }
1da177e4
LT		 3313
3314 chunk_size = mddev->chunk_size;
2604b703
N		 3315
3316 if (chunk_size) {
1da177e4
LT		 3317 if (chunk_size > MAX_CHUNK_SIZE) {
3318 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3319 chunk_size, MAX_CHUNK_SIZE);
3320 return -EINVAL;
3321 }
3322 /*
3323 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3324 */
3325 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 3326 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 3327 return -EINVAL;
3328 }
3329 if (chunk_size < PAGE_SIZE) {
3330 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
3331 chunk_size, PAGE_SIZE);
3332 return -EINVAL;
3333 }
3334
3335 /* devices must have minimum size of one chunk */
d089c6af 3336 rdev_for_each(rdev, tmp, mddev) {
b2d444d7 3337 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3338 continue;
3339 if (rdev->size < chunk_size / 1024) {
3340 printk(KERN_WARNING
3341 "md: Dev %s smaller than chunk_size:"
3342 " %lluk < %dk\n",
3343 bdevname(rdev->bdev,b),
3344 (unsigned long long)rdev->size,
3345 chunk_size / 1024);
3346 return -EINVAL;
3347 }
3348 }
3349 }
3350
1da177e4 3351#ifdef CONFIG_KMOD
d9d166c2
N		 3352 if (mddev->level != LEVEL_NONE)
3353 request_module("md-level-%d", mddev->level);
3354 else if (mddev->clevel[0])
3355 request_module("md-%s", mddev->clevel);
1da177e4
LT		 3356#endif
3357
3358 /*
3359 * Drop all container device buffers, from now on
3360 * the only valid external interface is through the md
3361 * device.
1da177e4 3362 */
d089c6af 3363 rdev_for_each(rdev, tmp, mddev) {
b2d444d7 3364 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3365 continue;
3366 sync_blockdev(rdev->bdev);
f98393a6 3367 invalidate_bdev(rdev->bdev);
f0d76d70
N		 3368
3369 /* perform some consistency tests on the device.
3370 * We don't want the data to overlap the metadata,
3371 * Internal Bitmap issues has handled elsewhere.
3372 */
3373 if (rdev->data_offset < rdev->sb_offset) {
3374 if (mddev->size &&
3375 rdev->data_offset + mddev->size*2
3376 > rdev->sb_offset*2) {
3377 printk("md: %s: data overlaps metadata\n",
3378 mdname(mddev));
3379 return -EINVAL;
3380 }
3381 } else {
3382 if (rdev->sb_offset*2 + rdev->sb_size/512
3383 > rdev->data_offset) {
3384 printk("md: %s: metadata overlaps data\n",
3385 mdname(mddev));
3386 return -EINVAL;
3387 }
3388 }
1da177e4
LT		 3389 }
3390
3391 md_probe(mddev->unit, NULL, NULL);
3392 disk = mddev->gendisk;
3393 if (!disk)
3394 return -ENOMEM;
3395
3396 spin_lock(&pers_lock);
d9d166c2 3397 pers = find_pers(mddev->level, mddev->clevel);
2604b703 3398 if (!pers || !try_module_get(pers->owner)) {
1da177e4 3399 spin_unlock(&pers_lock);
d9d166c2
N		 3400 if (mddev->level != LEVEL_NONE)
3401 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3402 mddev->level);
3403 else
3404 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3405 mddev->clevel);
1da177e4
LT		 3406 return -EINVAL;
3407 }
2604b703 3408 mddev->pers = pers;
1da177e4 3409 spin_unlock(&pers_lock);
d9d166c2
N		 3410 mddev->level = pers->level;
3411 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
1da177e4 3412
f6705578 3413 if (mddev->reshape_position != MaxSector &&
63c70c4f 3414 pers->start_reshape == NULL) {
f6705578
N		 3415 /* This personality cannot handle reshaping... */
3416 mddev->pers = NULL;
3417 module_put(pers->owner);
3418 return -EINVAL;
3419 }
3420
7dd5e7c3
N		 3421 if (pers->sync_request) {
3422 /* Warn if this is a potentially silly
3423 * configuration.
3424 */
3425 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3426 mdk_rdev_t *rdev2;
3427 struct list_head *tmp2;
3428 int warned = 0;
d089c6af
N		 3429 rdev_for_each(rdev, tmp, mddev) {
3430 rdev_for_each(rdev2, tmp2, mddev) {
7dd5e7c3
N		 3431 if (rdev < rdev2 &&
3432 rdev->bdev->bd_contains ==
3433 rdev2->bdev->bd_contains) {
3434 printk(KERN_WARNING
3435 "%s: WARNING: %s appears to be"
3436 " on the same physical disk as"
3437 " %s.\n",
3438 mdname(mddev),
3439 bdevname(rdev->bdev,b),
3440 bdevname(rdev2->bdev,b2));
3441 warned = 1;
3442 }
3443 }
3444 }
3445 if (warned)
3446 printk(KERN_WARNING
3447 "True protection against single-disk"
3448 " failure might be compromised.\n");
3449 }
3450
657390d2 3451 mddev->recovery = 0;
1da177e4 3452 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 3453 mddev->barriers_work = 1;
6ff8d8ec 3454 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 3455
f91de92e
N		 3456 if (start_readonly)
3457 mddev->ro = 2; /* read-only, but switch on first write */
3458
b15c2e57
N		 3459 err = mddev->pers->run(mddev);
3460 if (!err && mddev->pers->sync_request) {
3461 err = bitmap_create(mddev);
3462 if (err) {
3463 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3464 mdname(mddev), err);
3465 mddev->pers->stop(mddev);
3466 }
3467 }
1da177e4
LT		 3468 if (err) {
3469 printk(KERN_ERR "md: pers->run() failed ...\n");
3470 module_put(mddev->pers->owner);
3471 mddev->pers = NULL;
32a7627c
N		 3472 bitmap_destroy(mddev);
3473 return err;
1da177e4 3474 }
5e55e2f5
N		 3475 if (mddev->pers->sync_request) {
3476 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3477 printk(KERN_WARNING
3478 "md: cannot register extra attributes for %s\n",
3479 mdname(mddev));
3480 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
fd9d49ca
N		 3481 mddev->ro = 0;
3482
1da177e4
LT		 3483 atomic_set(&mddev->writes_pending,0);
3484 mddev->safemode = 0;
3485 mddev->safemode_timer.function = md_safemode_timeout;
3486 mddev->safemode_timer.data = (unsigned long) mddev;
16f17b39 3487 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
1da177e4 3488 mddev->in_sync = 1;
86e6ffdd 3489
d089c6af 3490 rdev_for_each(rdev, tmp, mddev)
86e6ffdd
N		 3491 if (rdev->raid_disk >= 0) {
3492 char nm[20];
3493 sprintf(nm, "rd%d", rdev->raid_disk);
5e55e2f5
N		 3494 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3495 printk("md: cannot register %s for %s\n",
3496 nm, mdname(mddev));
86e6ffdd 3497 }
1da177e4
LT		 3498
3499 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3500
850b2b42
N		 3501 if (mddev->flags)
3502 md_update_sb(mddev, 0);
1da177e4
LT		 3503
3504 set_capacity(disk, mddev->array_size<<1);
3505
3506 /* If we call blk_queue_make_request here, it will
3507 * re-initialise max_sectors etc which may have been
3508 * refined inside -> run. So just set the bits we need to set.
3509 * Most initialisation happended when we called
3510 * blk_queue_make_request(..., md_fail_request)
3511 * earlier.
3512 */
3513 mddev->queue->queuedata = mddev;
3514 mddev->queue->make_request_fn = mddev->pers->make_request;
3515
5fd6c1dc
N		 3516 /* If there is a partially-recovered drive we need to
3517 * start recovery here. If we leave it to md_check_recovery,
3518 * it will remove the drives and not do the right thing
3519 */
0b8c9de0 3520 if (mddev->degraded && !mddev->sync_thread) {
5fd6c1dc
N		 3521 struct list_head *rtmp;
3522 int spares = 0;
d089c6af 3523 rdev_for_each(rdev, rtmp, mddev)
5fd6c1dc
N		 3524 if (rdev->raid_disk >= 0 &&
3525 !test_bit(In_sync, &rdev->flags) &&
3526 !test_bit(Faulty, &rdev->flags))
3527 /* complete an interrupted recovery */
3528 spares++;
3529 if (spares && mddev->pers->sync_request) {
3530 mddev->recovery = 0;
3531 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3532 mddev->sync_thread = md_register_thread(md_do_sync,
3533 mddev,
3534 "%s_resync");
3535 if (!mddev->sync_thread) {
3536 printk(KERN_ERR "%s: could not start resync"
3537 " thread...\n",
3538 mdname(mddev));
3539 /* leave the spares where they are, it shouldn't hurt */
3540 mddev->recovery = 0;
0b8c9de0 3541 }
5fd6c1dc
N		 3542 }
3543 }
0b8c9de0
N		 3544 md_wakeup_thread(mddev->thread);
3545 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5fd6c1dc 3546
44ce6294 3547 mddev->changed = 1;
d7603b7e 3548 md_new_event(mddev);
edfaa7c3 3549 kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE);
1da177e4
LT		 3550 return 0;
3551}
3552
3553static int restart_array(mddev_t *mddev)
3554{
3555 struct gendisk *disk = mddev->gendisk;
3556 int err;
3557
3558 /*
3559 * Complain if it has no devices
3560 */
3561 err = -ENXIO;
3562 if (list_empty(&mddev->disks))
3563 goto out;
3564
3565 if (mddev->pers) {
3566 err = -EBUSY;
3567 if (!mddev->ro)
3568 goto out;
3569
3570 mddev->safemode = 0;
3571 mddev->ro = 0;
3572 set_disk_ro(disk, 0);
3573
3574 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3575 mdname(mddev));
3576 /*
3577 * Kick recovery or resync if necessary
3578 */
3579 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3580 md_wakeup_thread(mddev->thread);
5fd6c1dc 3581 md_wakeup_thread(mddev->sync_thread);
1da177e4 3582 err = 0;
9e653b63 3583 } else
1da177e4 3584 err = -EINVAL;
1da177e4
LT		 3585
3586out:
3587 return err;
3588}
3589
acc55e22
N		 3590/* similar to deny_write_access, but accounts for our holding a reference
3591 * to the file ourselves */
3592static int deny_bitmap_write_access(struct file * file)
3593{
3594 struct inode *inode = file->f_mapping->host;
3595
3596 spin_lock(&inode->i_lock);
3597 if (atomic_read(&inode->i_writecount) > 1) {
3598 spin_unlock(&inode->i_lock);
3599 return -ETXTBSY;
3600 }
3601 atomic_set(&inode->i_writecount, -1);
3602 spin_unlock(&inode->i_lock);
3603
3604 return 0;
3605}
3606
3607static void restore_bitmap_write_access(struct file *file)
3608{
3609 struct inode *inode = file->f_mapping->host;
3610
3611 spin_lock(&inode->i_lock);
3612 atomic_set(&inode->i_writecount, 1);
3613 spin_unlock(&inode->i_lock);
3614}
3615
9e653b63
N		 3616/* mode:
3617 * 0 - completely stop and dis-assemble array
3618 * 1 - switch to readonly
3619 * 2 - stop but do not disassemble array
3620 */
3621static int do_md_stop(mddev_t * mddev, int mode)
1da177e4
LT		 3622{
3623 int err = 0;
3624 struct gendisk *disk = mddev->gendisk;
3625
3626 if (mddev->pers) {
3627 if (atomic_read(&mddev->active)>2) {
3628 printk("md: %s still in use.\n",mdname(mddev));
3629 return -EBUSY;
3630 }
3631
3632 if (mddev->sync_thread) {
5fd6c1dc 3633 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4
LT		 3634 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3635 md_unregister_thread(mddev->sync_thread);
3636 mddev->sync_thread = NULL;
3637 }
3638
3639 del_timer_sync(&mddev->safemode_timer);
3640
3641 invalidate_partition(disk, 0);
3642
9e653b63
N		 3643 switch(mode) {
3644 case 1: /* readonly */
1da177e4 3645 err = -ENXIO;
f91de92e 3646 if (mddev->ro==1)
1da177e4
LT		 3647 goto out;
3648 mddev->ro = 1;
9e653b63
N		 3649 break;
3650 case 0: /* disassemble */
3651 case 2: /* stop */
6b8b3e8a 3652 bitmap_flush(mddev);
a9701a30 3653 md_super_wait(mddev);
1da177e4
LT		 3654 if (mddev->ro)
3655 set_disk_ro(disk, 0);
3656 blk_queue_make_request(mddev->queue, md_fail_request);
3657 mddev->pers->stop(mddev);
d1b5380c
N		 3658 mddev->queue->merge_bvec_fn = NULL;
3659 mddev->queue->unplug_fn = NULL;
041ae52e 3660 mddev->queue->backing_dev_info.congested_fn = NULL;
411036fa
N		 3661 if (mddev->pers->sync_request)
3662 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3663
1da177e4
LT		 3664 module_put(mddev->pers->owner);
3665 mddev->pers = NULL;
0d4ca600
N		 3666
3667 set_capacity(disk, 0);
44ce6294 3668 mddev->changed = 1;
0d4ca600 3669
1da177e4
LT		 3670 if (mddev->ro)
3671 mddev->ro = 0;
3672 }
850b2b42 3673 if (!mddev->in_sync || mddev->flags) {
1da177e4
LT		 3674 /* mark array as shutdown cleanly */
3675 mddev->in_sync = 1;
850b2b42 3676 md_update_sb(mddev, 1);
1da177e4 3677 }
9e653b63 3678 if (mode == 1)
1da177e4 3679 set_disk_ro(disk, 1);
5fd6c1dc 3680 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4 3681 }
32a7627c 3682
1da177e4
LT		 3683 /*
3684 * Free resources if final stop
3685 */
9e653b63 3686 if (mode == 0) {
86e6ffdd
N		 3687 mdk_rdev_t *rdev;
3688 struct list_head *tmp;
0d4ca600 3689
1da177e4
LT		 3690 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3691
978f946b
N		 3692 bitmap_destroy(mddev);
3693 if (mddev->bitmap_file) {
acc55e22 3694 restore_bitmap_write_access(mddev->bitmap_file);
978f946b
N		 3695 fput(mddev->bitmap_file);
3696 mddev->bitmap_file = NULL;
3697 }
3698 mddev->bitmap_offset = 0;
3699
d089c6af 3700 rdev_for_each(rdev, tmp, mddev)
86e6ffdd
N		 3701 if (rdev->raid_disk >= 0) {
3702 char nm[20];
3703 sprintf(nm, "rd%d", rdev->raid_disk);
3704 sysfs_remove_link(&mddev->kobj, nm);
3705 }
3706
177a99b2 3707 /* make sure all md_delayed_delete calls have finished */
5792a285
N		 3708 flush_scheduled_work();
3709
1da177e4
LT		 3710 export_array(mddev);
3711
3712 mddev->array_size = 0;
9e653b63
N		 3713 mddev->size = 0;
3714 mddev->raid_disks = 0;
a94213b1 3715 mddev->recovery_cp = 0;
c6207277 3716 mddev->resync_max = MaxSector;
08a02ecd 3717 mddev->reshape_position = MaxSector;
e691063a 3718 mddev->external = 0;
1ec4a939 3719 mddev->persistent = 0;
d897dbf9
N		 3720 mddev->level = LEVEL_NONE;
3721 mddev->clevel[0] = 0;
3722 mddev->flags = 0;
3723 mddev->ro = 0;
3724 mddev->metadata_type[0] = 0;
3725 mddev->chunk_size = 0;
3726 mddev->ctime = mddev->utime = 0;
3727 mddev->layout = 0;
3728 mddev->max_disks = 0;
3729 mddev->events = 0;
3730 mddev->delta_disks = 0;
3731 mddev->new_level = LEVEL_NONE;
3732 mddev->new_layout = 0;
3733 mddev->new_chunk = 0;
3734 mddev->curr_resync = 0;
3735 mddev->resync_mismatches = 0;
3736 mddev->suspend_lo = mddev->suspend_hi = 0;
3737 mddev->sync_speed_min = mddev->sync_speed_max = 0;
3738 mddev->recovery = 0;
3739 mddev->in_sync = 0;
3740 mddev->changed = 0;
3741 mddev->degraded = 0;
3742 mddev->barriers_work = 0;
3743 mddev->safemode = 0;
9e653b63 3744
a8a55c38 3745 } else if (mddev->pers)
1da177e4
LT		 3746 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3747 mdname(mddev));
3748 err = 0;
d7603b7e 3749 md_new_event(mddev);
1da177e4
LT		 3750out:
3751 return err;
3752}
3753
fdee8ae4 3754#ifndef MODULE
1da177e4
LT		 3755static void autorun_array(mddev_t *mddev)
3756{
3757 mdk_rdev_t *rdev;
3758 struct list_head *tmp;
3759 int err;
3760
a757e64c 3761 if (list_empty(&mddev->disks))
1da177e4 3762 return;
1da177e4
LT		 3763
3764 printk(KERN_INFO "md: running: ");
3765
d089c6af 3766 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 3767 char b[BDEVNAME_SIZE];
3768 printk("<%s>", bdevname(rdev->bdev,b));
3769 }
3770 printk("\n");
3771
3772 err = do_md_run (mddev);
3773 if (err) {
3774 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3775 do_md_stop (mddev, 0);
3776 }
3777}
3778
3779/*
3780 * lets try to run arrays based on all disks that have arrived
3781 * until now. (those are in pending_raid_disks)
3782 *
3783 * the method: pick the first pending disk, collect all disks with
3784 * the same UUID, remove all from the pending list and put them into
3785 * the 'same_array' list. Then order this list based on superblock
3786 * update time (freshest comes first), kick out 'old' disks and
3787 * compare superblocks. If everything's fine then run it.
3788 *
3789 * If "unit" is allocated, then bump its reference count
3790 */
3791static void autorun_devices(int part)
3792{
1da177e4
LT		 3793 struct list_head *tmp;
3794 mdk_rdev_t *rdev0, *rdev;
3795 mddev_t *mddev;
3796 char b[BDEVNAME_SIZE];
3797
3798 printk(KERN_INFO "md: autorun ...\n");
3799 while (!list_empty(&pending_raid_disks)) {
e8703fe1 3800 int unit;
1da177e4 3801 dev_t dev;
ad01c9e3 3802 LIST_HEAD(candidates);
1da177e4
LT		 3803 rdev0 = list_entry(pending_raid_disks.next,
3804 mdk_rdev_t, same_set);
3805
3806 printk(KERN_INFO "md: considering %s ...\n",
3807 bdevname(rdev0->bdev,b));
3808 INIT_LIST_HEAD(&candidates);
73c34431 3809 rdev_for_each_list(rdev, tmp, pending_raid_disks)
1da177e4
LT		 3810 if (super_90_load(rdev, rdev0, 0) >= 0) {
3811 printk(KERN_INFO "md: adding %s ...\n",
3812 bdevname(rdev->bdev,b));
3813 list_move(&rdev->same_set, &candidates);
3814 }
3815 /*
3816 * now we have a set of devices, with all of them having
3817 * mostly sane superblocks. It's time to allocate the
3818 * mddev.
3819 */
e8703fe1
N		 3820 if (part) {
3821 dev = MKDEV(mdp_major,
3822 rdev0->preferred_minor << MdpMinorShift);
3823 unit = MINOR(dev) >> MdpMinorShift;
3824 } else {
3825 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3826 unit = MINOR(dev);
3827 }
3828 if (rdev0->preferred_minor != unit) {
1da177e4
LT		 3829 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3830 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3831 break;
3832 }
1da177e4
LT		 3833
3834 md_probe(dev, NULL, NULL);
3835 mddev = mddev_find(dev);
3836 if (!mddev) {
3837 printk(KERN_ERR
3838 "md: cannot allocate memory for md drive.\n");
3839 break;
3840 }
3841 if (mddev_lock(mddev))
3842 printk(KERN_WARNING "md: %s locked, cannot run\n",
3843 mdname(mddev));
3844 else if (mddev->raid_disks || mddev->major_version
3845 || !list_empty(&mddev->disks)) {
3846 printk(KERN_WARNING
3847 "md: %s already running, cannot run %s\n",
3848 mdname(mddev), bdevname(rdev0->bdev,b));
3849 mddev_unlock(mddev);
3850 } else {
3851 printk(KERN_INFO "md: created %s\n", mdname(mddev));
1ec4a939 3852 mddev->persistent = 1;
73c34431 3853 rdev_for_each_list(rdev, tmp, candidates) {
1da177e4
LT		 3854 list_del_init(&rdev->same_set);
3855 if (bind_rdev_to_array(rdev, mddev))
3856 export_rdev(rdev);
3857 }
3858 autorun_array(mddev);
3859 mddev_unlock(mddev);
3860 }
3861 /* on success, candidates will be empty, on error
3862 * it won't...
3863 */
73c34431 3864 rdev_for_each_list(rdev, tmp, candidates)
1da177e4
LT		 3865 export_rdev(rdev);
3866 mddev_put(mddev);
3867 }
3868 printk(KERN_INFO "md: ... autorun DONE.\n");
3869}
fdee8ae4 3870#endif /* !MODULE */
1da177e4 3871
1da177e4
LT		 3872static int get_version(void __user * arg)
3873{
3874 mdu_version_t ver;
3875
3876 ver.major = MD_MAJOR_VERSION;
3877 ver.minor = MD_MINOR_VERSION;
3878 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3879
3880 if (copy_to_user(arg, &ver, sizeof(ver)))
3881 return -EFAULT;
3882
3883 return 0;
3884}
3885
3886static int get_array_info(mddev_t * mddev, void __user * arg)
3887{
3888 mdu_array_info_t info;
3889 int nr,working,active,failed,spare;
3890 mdk_rdev_t *rdev;
3891 struct list_head *tmp;
3892
3893 nr=working=active=failed=spare=0;
d089c6af 3894 rdev_for_each(rdev, tmp, mddev) {
1da177e4 3895 nr++;
b2d444d7 3896 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3897 failed++;
3898 else {
3899 working++;
b2d444d7 3900 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 3901 active++;
3902 else
3903 spare++;
3904 }
3905 }
3906
3907 info.major_version = mddev->major_version;
3908 info.minor_version = mddev->minor_version;
3909 info.patch_version = MD_PATCHLEVEL_VERSION;
3910 info.ctime = mddev->ctime;
3911 info.level = mddev->level;
3912 info.size = mddev->size;
284ae7ca
N		 3913 if (info.size != mddev->size) /* overflow */
3914 info.size = -1;
1da177e4
LT		 3915 info.nr_disks = nr;
3916 info.raid_disks = mddev->raid_disks;
3917 info.md_minor = mddev->md_minor;
3918 info.not_persistent= !mddev->persistent;
3919
3920 info.utime = mddev->utime;
3921 info.state = 0;
3922 if (mddev->in_sync)
3923 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 3924 if (mddev->bitmap && mddev->bitmap_offset)
3925 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 3926 info.active_disks = active;
3927 info.working_disks = working;
3928 info.failed_disks = failed;
3929 info.spare_disks = spare;
3930
3931 info.layout = mddev->layout;
3932 info.chunk_size = mddev->chunk_size;
3933
3934 if (copy_to_user(arg, &info, sizeof(info)))
3935 return -EFAULT;
3936
3937 return 0;
3938}
3939
87162a28 3940static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 3941{
3942 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3943 char *ptr, *buf = NULL;
3944 int err = -ENOMEM;
3945
2a2275d6
N		 3946 md_allow_write(mddev);
3947
32a7627c
N		 3948 file = kmalloc(sizeof(*file), GFP_KERNEL);
3949 if (!file)
3950 goto out;
3951
3952 /* bitmap disabled, zero the first byte and copy out */
3953 if (!mddev->bitmap || !mddev->bitmap->file) {
3954 file->pathname[0] = '\0';
3955 goto copy_out;
3956 }
3957
3958 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3959 if (!buf)
3960 goto out;
3961
3962 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3963 if (!ptr)
3964 goto out;
3965
3966 strcpy(file->pathname, ptr);
3967
3968copy_out:
3969 err = 0;
3970 if (copy_to_user(arg, file, sizeof(*file)))
3971 err = -EFAULT;
3972out:
3973 kfree(buf);
3974 kfree(file);
3975 return err;
3976}
3977
1da177e4
LT		 3978static int get_disk_info(mddev_t * mddev, void __user * arg)
3979{
3980 mdu_disk_info_t info;
3981 unsigned int nr;
3982 mdk_rdev_t *rdev;
3983
3984 if (copy_from_user(&info, arg, sizeof(info)))
3985 return -EFAULT;
3986
3987 nr = info.number;
3988
3989 rdev = find_rdev_nr(mddev, nr);
3990 if (rdev) {
3991 info.major = MAJOR(rdev->bdev->bd_dev);
3992 info.minor = MINOR(rdev->bdev->bd_dev);
3993 info.raid_disk = rdev->raid_disk;
3994 info.state = 0;
b2d444d7 3995 if (test_bit(Faulty, &rdev->flags))
1da177e4 3996 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 3997 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 3998 info.state |= (1<<MD_DISK_ACTIVE);
3999 info.state |= (1<<MD_DISK_SYNC);
4000 }
8ddf9efe
N		 4001 if (test_bit(WriteMostly, &rdev->flags))
4002 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 4003 } else {
4004 info.major = info.minor = 0;
4005 info.raid_disk = -1;
4006 info.state = (1<<MD_DISK_REMOVED);
4007 }
4008
4009 if (copy_to_user(arg, &info, sizeof(info)))
4010 return -EFAULT;
4011
4012 return 0;
4013}
4014
4015static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4016{
4017 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4018 mdk_rdev_t *rdev;
4019 dev_t dev = MKDEV(info->major,info->minor);
4020
4021 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4022 return -EOVERFLOW;
4023
4024 if (!mddev->raid_disks) {
4025 int err;
4026 /* expecting a device which has a superblock */
4027 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4028 if (IS_ERR(rdev)) {
4029 printk(KERN_WARNING
4030 "md: md_import_device returned %ld\n",
4031 PTR_ERR(rdev));
4032 return PTR_ERR(rdev);
4033 }
4034 if (!list_empty(&mddev->disks)) {
4035 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4036 mdk_rdev_t, same_set);
4037 int err = super_types[mddev->major_version]
4038 .load_super(rdev, rdev0, mddev->minor_version);
4039 if (err < 0) {
4040 printk(KERN_WARNING
4041 "md: %s has different UUID to %s\n",
4042 bdevname(rdev->bdev,b),
4043 bdevname(rdev0->bdev,b2));
4044 export_rdev(rdev);
4045 return -EINVAL;
4046 }
4047 }
4048 err = bind_rdev_to_array(rdev, mddev);
4049 if (err)
4050 export_rdev(rdev);
4051 return err;
4052 }
4053
4054 /*
4055 * add_new_disk can be used once the array is assembled
4056 * to add "hot spares". They must already have a superblock
4057 * written
4058 */
4059 if (mddev->pers) {
4060 int err;
4061 if (!mddev->pers->hot_add_disk) {
4062 printk(KERN_WARNING
4063 "%s: personality does not support diskops!\n",
4064 mdname(mddev));
4065 return -EINVAL;
4066 }
7b1e35f6
N		 4067 if (mddev->persistent)
4068 rdev = md_import_device(dev, mddev->major_version,
4069 mddev->minor_version);
4070 else
4071 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 4072 if (IS_ERR(rdev)) {
4073 printk(KERN_WARNING
4074 "md: md_import_device returned %ld\n",
4075 PTR_ERR(rdev));
4076 return PTR_ERR(rdev);
4077 }
41158c7e
N		 4078 /* set save_raid_disk if appropriate */
4079 if (!mddev->persistent) {
4080 if (info->state & (1<<MD_DISK_SYNC) &&
4081 info->raid_disk < mddev->raid_disks)
4082 rdev->raid_disk = info->raid_disk;
4083 else
4084 rdev->raid_disk = -1;
4085 } else
4086 super_types[mddev->major_version].
4087 validate_super(mddev, rdev);
4088 rdev->saved_raid_disk = rdev->raid_disk;
4089
b2d444d7 4090 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 4091 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4092 set_bit(WriteMostly, &rdev->flags);
4093
1da177e4
LT		 4094 rdev->raid_disk = -1;
4095 err = bind_rdev_to_array(rdev, mddev);
7c7546cc
N		 4096 if (!err && !mddev->pers->hot_remove_disk) {
4097 /* If there is hot_add_disk but no hot_remove_disk
4098 * then added disks for geometry changes,
4099 * and should be added immediately.
4100 */
4101 super_types[mddev->major_version].
4102 validate_super(mddev, rdev);
4103 err = mddev->pers->hot_add_disk(mddev, rdev);
4104 if (err)
4105 unbind_rdev_from_array(rdev);
4106 }
1da177e4
LT		 4107 if (err)
4108 export_rdev(rdev);
c361777f 4109
17571284 4110 md_update_sb(mddev, 1);
c361777f 4111 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 4112 md_wakeup_thread(mddev->thread);
1da177e4
LT		 4113 return err;
4114 }
4115
4116 /* otherwise, add_new_disk is only allowed
4117 * for major_version==0 superblocks
4118 */
4119 if (mddev->major_version != 0) {
4120 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4121 mdname(mddev));
4122 return -EINVAL;
4123 }
4124
4125 if (!(info->state & (1<<MD_DISK_FAULTY))) {
4126 int err;
4127 rdev = md_import_device (dev, -1, 0);
4128 if (IS_ERR(rdev)) {
4129 printk(KERN_WARNING
4130 "md: error, md_import_device() returned %ld\n",
4131 PTR_ERR(rdev));
4132 return PTR_ERR(rdev);
4133 }
4134 rdev->desc_nr = info->number;
4135 if (info->raid_disk < mddev->raid_disks)
4136 rdev->raid_disk = info->raid_disk;
4137 else
4138 rdev->raid_disk = -1;
4139
1da177e4 4140 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 4141 if (info->state & (1<<MD_DISK_SYNC))
4142 set_bit(In_sync, &rdev->flags);
1da177e4 4143
8ddf9efe
N		 4144 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4145 set_bit(WriteMostly, &rdev->flags);
4146
1da177e4
LT		 4147 if (!mddev->persistent) {
4148 printk(KERN_INFO "md: nonpersistent superblock ...\n");
4149 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4150 } else
4151 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
4152 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
4153
2bf071bf
N		 4154 err = bind_rdev_to_array(rdev, mddev);
4155 if (err) {
4156 export_rdev(rdev);
4157 return err;
4158 }
1da177e4
LT		 4159 }
4160
4161 return 0;
4162}
4163
4164static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4165{
4166 char b[BDEVNAME_SIZE];
4167 mdk_rdev_t *rdev;
4168
4169 if (!mddev->pers)
4170 return -ENODEV;
4171
4172 rdev = find_rdev(mddev, dev);
4173 if (!rdev)
4174 return -ENXIO;
4175
4176 if (rdev->raid_disk >= 0)
4177 goto busy;
4178
4179 kick_rdev_from_array(rdev);
850b2b42 4180 md_update_sb(mddev, 1);
d7603b7e 4181 md_new_event(mddev);
1da177e4
LT		 4182
4183 return 0;
4184busy:
fdefa4d8 4185 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
1da177e4
LT		 4186 bdevname(rdev->bdev,b), mdname(mddev));
4187 return -EBUSY;
4188}
4189
4190static int hot_add_disk(mddev_t * mddev, dev_t dev)
4191{
4192 char b[BDEVNAME_SIZE];
4193 int err;
4194 unsigned int size;
4195 mdk_rdev_t *rdev;
4196
4197 if (!mddev->pers)
4198 return -ENODEV;
4199
4200 if (mddev->major_version != 0) {
4201 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4202 " version-0 superblocks.\n",
4203 mdname(mddev));
4204 return -EINVAL;
4205 }
4206 if (!mddev->pers->hot_add_disk) {
4207 printk(KERN_WARNING
4208 "%s: personality does not support diskops!\n",
4209 mdname(mddev));
4210 return -EINVAL;
4211 }
4212
4213 rdev = md_import_device (dev, -1, 0);
4214 if (IS_ERR(rdev)) {
4215 printk(KERN_WARNING
4216 "md: error, md_import_device() returned %ld\n",
4217 PTR_ERR(rdev));
4218 return -EINVAL;
4219 }
4220
4221 if (mddev->persistent)
4222 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
4223 else
4224 rdev->sb_offset =
4225 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4226
4227 size = calc_dev_size(rdev, mddev->chunk_size);
4228 rdev->size = size;
4229
b2d444d7 4230 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4231 printk(KERN_WARNING
4232 "md: can not hot-add faulty %s disk to %s!\n",
4233 bdevname(rdev->bdev,b), mdname(mddev));
4234 err = -EINVAL;
4235 goto abort_export;
4236 }
b2d444d7 4237 clear_bit(In_sync, &rdev->flags);
1da177e4 4238 rdev->desc_nr = -1;
5842730d 4239 rdev->saved_raid_disk = -1;
2bf071bf
N		 4240 err = bind_rdev_to_array(rdev, mddev);
4241 if (err)
4242 goto abort_export;
1da177e4
LT		 4243
4244 /*
4245 * The rest should better be atomic, we can have disk failures
4246 * noticed in interrupt contexts ...
4247 */
4248
4249 if (rdev->desc_nr == mddev->max_disks) {
4250 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
4251 mdname(mddev));
4252 err = -EBUSY;
4253 goto abort_unbind_export;
4254 }
4255
4256 rdev->raid_disk = -1;
4257
850b2b42 4258 md_update_sb(mddev, 1);
1da177e4
LT		 4259
4260 /*
4261 * Kick recovery, maybe this spare has to be added to the
4262 * array immediately.
4263 */
4264 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4265 md_wakeup_thread(mddev->thread);
d7603b7e 4266 md_new_event(mddev);
1da177e4
LT		 4267 return 0;
4268
4269abort_unbind_export:
4270 unbind_rdev_from_array(rdev);
4271
4272abort_export:
4273 export_rdev(rdev);
4274 return err;
4275}
4276
32a7627c
N		 4277static int set_bitmap_file(mddev_t *mddev, int fd)
4278{
4279 int err;
4280
36fa3063
N		 4281 if (mddev->pers) {
4282 if (!mddev->pers->quiesce)
4283 return -EBUSY;
4284 if (mddev->recovery || mddev->sync_thread)
4285 return -EBUSY;
4286 /* we should be able to change the bitmap.. */
4287 }
32a7627c 4288
32a7627c 4289
36fa3063
N		 4290 if (fd >= 0) {
4291 if (mddev->bitmap)
4292 return -EEXIST; /* cannot add when bitmap is present */
4293 mddev->bitmap_file = fget(fd);
32a7627c 4294
36fa3063
N		 4295 if (mddev->bitmap_file == NULL) {
4296 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4297 mdname(mddev));
4298 return -EBADF;
4299 }
4300
4301 err = deny_bitmap_write_access(mddev->bitmap_file);
4302 if (err) {
4303 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4304 mdname(mddev));
4305 fput(mddev->bitmap_file);
4306 mddev->bitmap_file = NULL;
4307 return err;
4308 }
a654b9d8 4309 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 4310 } else if (mddev->bitmap == NULL)
4311 return -ENOENT; /* cannot remove what isn't there */
4312 err = 0;
4313 if (mddev->pers) {
4314 mddev->pers->quiesce(mddev, 1);
4315 if (fd >= 0)
4316 err = bitmap_create(mddev);
d7375ab3 4317 if (fd < 0 || err) {
36fa3063 4318 bitmap_destroy(mddev);
d7375ab3
N		 4319 fd = -1; /* make sure to put the file */
4320 }
36fa3063 4321 mddev->pers->quiesce(mddev, 0);
d7375ab3
N		 4322 }
4323 if (fd < 0) {
acc55e22
N		 4324 if (mddev->bitmap_file) {
4325 restore_bitmap_write_access(mddev->bitmap_file);
36fa3063 4326 fput(mddev->bitmap_file);
acc55e22 4327 }
36fa3063
N		 4328 mddev->bitmap_file = NULL;
4329 }
4330
32a7627c
N		 4331 return err;
4332}
4333
1da177e4
LT		 4334/*
4335 * set_array_info is used two different ways
4336 * The original usage is when creating a new array.
4337 * In this usage, raid_disks is > 0 and it together with
4338 * level, size, not_persistent,layout,chunksize determine the
4339 * shape of the array.
4340 * This will always create an array with a type-0.90.0 superblock.
4341 * The newer usage is when assembling an array.
4342 * In this case raid_disks will be 0, and the major_version field is
4343 * use to determine which style super-blocks are to be found on the devices.
4344 * The minor and patch _version numbers are also kept incase the
4345 * super_block handler wishes to interpret them.
4346 */
4347static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4348{
4349
4350 if (info->raid_disks == 0) {
4351 /* just setting version number for superblock loading */
4352 if (info->major_version < 0 ||
50511da3 4353 info->major_version >= ARRAY_SIZE(super_types) ||
1da177e4
LT		 4354 super_types[info->major_version].name == NULL) {
4355 /* maybe try to auto-load a module? */
4356 printk(KERN_INFO
4357 "md: superblock version %d not known\n",
4358 info->major_version);
4359 return -EINVAL;
4360 }
4361 mddev->major_version = info->major_version;
4362 mddev->minor_version = info->minor_version;
4363 mddev->patch_version = info->patch_version;
3f9d7b0d 4364 mddev->persistent = !info->not_persistent;
1da177e4
LT		 4365 return 0;
4366 }
4367 mddev->major_version = MD_MAJOR_VERSION;
4368 mddev->minor_version = MD_MINOR_VERSION;
4369 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4370 mddev->ctime = get_seconds();
4371
4372 mddev->level = info->level;
17115e03 4373 mddev->clevel[0] = 0;
1da177e4
LT		 4374 mddev->size = info->size;
4375 mddev->raid_disks = info->raid_disks;
4376 /* don't set md_minor, it is determined by which /dev/md* was
4377 * openned
4378 */
4379 if (info->state & (1<<MD_SB_CLEAN))
4380 mddev->recovery_cp = MaxSector;
4381 else
4382 mddev->recovery_cp = 0;
4383 mddev->persistent = ! info->not_persistent;
e691063a 4384 mddev->external = 0;
1da177e4
LT		 4385
4386 mddev->layout = info->layout;
4387 mddev->chunk_size = info->chunk_size;
4388
4389 mddev->max_disks = MD_SB_DISKS;
4390
e691063a
N		 4391 if (mddev->persistent)
4392 mddev->flags = 0;
850b2b42 4393 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 4394
b2a2703c
N		 4395 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4396 mddev->bitmap_offset = 0;
4397
f6705578
N		 4398 mddev->reshape_position = MaxSector;
4399
1da177e4
LT		 4400 /*
4401 * Generate a 128 bit UUID
4402 */
4403 get_random_bytes(mddev->uuid, 16);
4404
f6705578
N		 4405 mddev->new_level = mddev->level;
4406 mddev->new_chunk = mddev->chunk_size;
4407 mddev->new_layout = mddev->layout;
4408 mddev->delta_disks = 0;
4409
1da177e4
LT		 4410 return 0;
4411}
4412
a35b0d69
N		 4413static int update_size(mddev_t *mddev, unsigned long size)
4414{
4415 mdk_rdev_t * rdev;
4416 int rv;
4417 struct list_head *tmp;
8ddeeae5 4418 int fit = (size == 0);
a35b0d69
N		 4419
4420 if (mddev->pers->resize == NULL)
4421 return -EINVAL;
4422 /* The "size" is the amount of each device that is used.
4423 * This can only make sense for arrays with redundancy.
4424 * linear and raid0 always use whatever space is available
4425 * We can only consider changing the size if no resync
4426 * or reconstruction is happening, and if the new size
4427 * is acceptable. It must fit before the sb_offset or,
4428 * if that is <data_offset, it must fit before the
4429 * size of each device.
4430 * If size is zero, we find the largest size that fits.
4431 */
4432 if (mddev->sync_thread)
4433 return -EBUSY;
d089c6af 4434 rdev_for_each(rdev, tmp, mddev) {
a35b0d69 4435 sector_t avail;
01ab5662
N		 4436 avail = rdev->size * 2;
4437
a35b0d69
N		 4438 if (fit && (size == 0 || size > avail/2))
4439 size = avail/2;
4440 if (avail < ((sector_t)size << 1))
4441 return -ENOSPC;
4442 }
4443 rv = mddev->pers->resize(mddev, (sector_t)size *2);
4444 if (!rv) {
4445 struct block_device *bdev;
4446
4447 bdev = bdget_disk(mddev->gendisk, 0);
4448 if (bdev) {
1b1dcc1b 4449 mutex_lock(&bdev->bd_inode->i_mutex);
6d89332b 4450 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
1b1dcc1b 4451 mutex_unlock(&bdev->bd_inode->i_mutex);
a35b0d69
N		 4452 bdput(bdev);
4453 }
4454 }
4455 return rv;
4456}
4457
da943b99
N		 4458static int update_raid_disks(mddev_t *mddev, int raid_disks)
4459{
4460 int rv;
4461 /* change the number of raid disks */
63c70c4f 4462 if (mddev->pers->check_reshape == NULL)
da943b99
N		 4463 return -EINVAL;
4464 if (raid_disks <= 0 ||
4465 raid_disks >= mddev->max_disks)
4466 return -EINVAL;
63c70c4f 4467 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
da943b99 4468 return -EBUSY;
63c70c4f
N		 4469 mddev->delta_disks = raid_disks - mddev->raid_disks;
4470
4471 rv = mddev->pers->check_reshape(mddev);
da943b99
N		 4472 return rv;
4473}
4474
4475
1da177e4
LT		 4476/*
4477 * update_array_info is used to change the configuration of an
4478 * on-line array.
4479 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4480 * fields in the info are checked against the array.
4481 * Any differences that cannot be handled will cause an error.
4482 * Normally, only one change can be managed at a time.
4483 */
4484static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4485{
4486 int rv = 0;
4487 int cnt = 0;
36fa3063
N		 4488 int state = 0;
4489
4490 /* calculate expected state,ignoring low bits */
4491 if (mddev->bitmap && mddev->bitmap_offset)
4492 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 4493
4494 if (mddev->major_version != info->major_version ||
4495 mddev->minor_version != info->minor_version ||
4496/* mddev->patch_version != info->patch_version || */
4497 mddev->ctime != info->ctime ||
4498 mddev->level != info->level ||
4499/* mddev->layout != info->layout || */
4500 !mddev->persistent != info->not_persistent||
36fa3063
N		 4501 mddev->chunk_size != info->chunk_size ||
4502 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4503 ((state^info->state) & 0xfffffe00)
4504 )
1da177e4
LT		 4505 return -EINVAL;
4506 /* Check there is only one change */
284ae7ca 4507 if (info->size >= 0 && mddev->size != info->size) cnt++;
1da177e4
LT		 4508 if (mddev->raid_disks != info->raid_disks) cnt++;
4509 if (mddev->layout != info->layout) cnt++;
36fa3063 4510 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 4511 if (cnt == 0) return 0;
4512 if (cnt > 1) return -EINVAL;
4513
4514 if (mddev->layout != info->layout) {
4515 /* Change layout
4516 * we don't need to do anything at the md level, the
4517 * personality will take care of it all.
4518 */
4519 if (mddev->pers->reconfig == NULL)
4520 return -EINVAL;
4521 else
4522 return mddev->pers->reconfig(mddev, info->layout, -1);
4523 }
284ae7ca 4524 if (info->size >= 0 && mddev->size != info->size)
a35b0d69
N		 4525 rv = update_size(mddev, info->size);
4526
da943b99
N		 4527 if (mddev->raid_disks != info->raid_disks)
4528 rv = update_raid_disks(mddev, info->raid_disks);
4529
36fa3063
N		 4530 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4531 if (mddev->pers->quiesce == NULL)
4532 return -EINVAL;
4533 if (mddev->recovery || mddev->sync_thread)
4534 return -EBUSY;
4535 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4536 /* add the bitmap */
4537 if (mddev->bitmap)
4538 return -EEXIST;
4539 if (mddev->default_bitmap_offset == 0)
4540 return -EINVAL;
4541 mddev->bitmap_offset = mddev->default_bitmap_offset;
4542 mddev->pers->quiesce(mddev, 1);
4543 rv = bitmap_create(mddev);
4544 if (rv)
4545 bitmap_destroy(mddev);
4546 mddev->pers->quiesce(mddev, 0);
4547 } else {
4548 /* remove the bitmap */
4549 if (!mddev->bitmap)
4550 return -ENOENT;
4551 if (mddev->bitmap->file)
4552 return -EINVAL;
4553 mddev->pers->quiesce(mddev, 1);
4554 bitmap_destroy(mddev);
4555 mddev->pers->quiesce(mddev, 0);
4556 mddev->bitmap_offset = 0;
4557 }
4558 }
850b2b42 4559 md_update_sb(mddev, 1);
1da177e4
LT		 4560 return rv;
4561}
4562
4563static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4564{
4565 mdk_rdev_t *rdev;
4566
4567 if (mddev->pers == NULL)
4568 return -ENODEV;
4569
4570 rdev = find_rdev(mddev, dev);
4571 if (!rdev)
4572 return -ENODEV;
4573
4574 md_error(mddev, rdev);
4575 return 0;
4576}
4577
a885c8c4
CH		 4578static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4579{
4580 mddev_t *mddev = bdev->bd_disk->private_data;
4581
4582 geo->heads = 2;
4583 geo->sectors = 4;
4584 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4585 return 0;
4586}
4587
1da177e4
LT		 4588static int md_ioctl(struct inode *inode, struct file *file,
4589 unsigned int cmd, unsigned long arg)
4590{
4591 int err = 0;
4592 void __user *argp = (void __user *)arg;
1da177e4
LT		 4593 mddev_t *mddev = NULL;
4594
4595 if (!capable(CAP_SYS_ADMIN))
4596 return -EACCES;
4597
4598 /*
4599 * Commands dealing with the RAID driver but not any
4600 * particular array:
4601 */
4602 switch (cmd)
4603 {
4604 case RAID_VERSION:
4605 err = get_version(argp);
4606 goto done;
4607
4608 case PRINT_RAID_DEBUG:
4609 err = 0;
4610 md_print_devices();
4611 goto done;
4612
4613#ifndef MODULE
4614 case RAID_AUTORUN:
4615 err = 0;
4616 autostart_arrays(arg);
4617 goto done;
4618#endif
4619 default:;
4620 }
4621
4622 /*
4623 * Commands creating/starting a new array:
4624 */
4625
4626 mddev = inode->i_bdev->bd_disk->private_data;
4627
4628 if (!mddev) {
4629 BUG();
4630 goto abort;
4631 }
4632
1da177e4
LT		 4633 err = mddev_lock(mddev);
4634 if (err) {
4635 printk(KERN_INFO
4636 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4637 err, cmd);
4638 goto abort;
4639 }
4640
4641 switch (cmd)
4642 {
4643 case SET_ARRAY_INFO:
4644 {
4645 mdu_array_info_t info;
4646 if (!arg)
4647 memset(&info, 0, sizeof(info));
4648 else if (copy_from_user(&info, argp, sizeof(info))) {
4649 err = -EFAULT;
4650 goto abort_unlock;
4651 }
4652 if (mddev->pers) {
4653 err = update_array_info(mddev, &info);
4654 if (err) {
4655 printk(KERN_WARNING "md: couldn't update"
4656 " array info. %d\n", err);
4657 goto abort_unlock;
4658 }
4659 goto done_unlock;
4660 }
4661 if (!list_empty(&mddev->disks)) {
4662 printk(KERN_WARNING
4663 "md: array %s already has disks!\n",
4664 mdname(mddev));
4665 err = -EBUSY;
4666 goto abort_unlock;
4667 }
4668 if (mddev->raid_disks) {
4669 printk(KERN_WARNING
4670 "md: array %s already initialised!\n",
4671 mdname(mddev));
4672 err = -EBUSY;
4673 goto abort_unlock;
4674 }
4675 err = set_array_info(mddev, &info);
4676 if (err) {
4677 printk(KERN_WARNING "md: couldn't set"
4678 " array info. %d\n", err);
4679 goto abort_unlock;
4680 }
4681 }
4682 goto done_unlock;
4683
4684 default:;
4685 }
4686
4687 /*
4688 * Commands querying/configuring an existing array:
4689 */
32a7627c 4690 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3f9d7b0d 4691 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
a17184a9
N		 4692 if ((!mddev->raid_disks && !mddev->external)
4693 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4694 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4695 && cmd != GET_BITMAP_FILE) {
1da177e4
LT		 4696 err = -ENODEV;
4697 goto abort_unlock;
4698 }
4699
4700 /*
4701 * Commands even a read-only array can execute:
4702 */
4703 switch (cmd)
4704 {
4705 case GET_ARRAY_INFO:
4706 err = get_array_info(mddev, argp);
4707 goto done_unlock;
4708
32a7627c 4709 case GET_BITMAP_FILE:
87162a28 4710 err = get_bitmap_file(mddev, argp);
32a7627c
N		 4711 goto done_unlock;
4712
1da177e4
LT		 4713 case GET_DISK_INFO:
4714 err = get_disk_info(mddev, argp);
4715 goto done_unlock;
4716
4717 case RESTART_ARRAY_RW:
4718 err = restart_array(mddev);
4719 goto done_unlock;
4720
4721 case STOP_ARRAY:
4722 err = do_md_stop (mddev, 0);
4723 goto done_unlock;
4724
4725 case STOP_ARRAY_RO:
4726 err = do_md_stop (mddev, 1);
4727 goto done_unlock;
4728
4729 /*
4730 * We have a problem here : there is no easy way to give a CHS
4731 * virtual geometry. We currently pretend that we have a 2 heads
4732 * 4 sectors (with a BIG number of cylinders...). This drives
4733 * dosfs just mad... ;-)
4734 */
1da177e4
LT		 4735 }
4736
4737 /*
4738 * The remaining ioctls are changing the state of the
f91de92e
N		 4739 * superblock, so we do not allow them on read-only arrays.
4740 * However non-MD ioctls (e.g. get-size) will still come through
4741 * here and hit the 'default' below, so only disallow
4742 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 4743 */
f91de92e
N		 4744 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4745 mddev->ro && mddev->pers) {
4746 if (mddev->ro == 2) {
4747 mddev->ro = 0;
4748 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4749 md_wakeup_thread(mddev->thread);
4750
4751 } else {
4752 err = -EROFS;
4753 goto abort_unlock;
4754 }
1da177e4
LT		 4755 }
4756
4757 switch (cmd)
4758 {
4759 case ADD_NEW_DISK:
4760 {
4761 mdu_disk_info_t info;
4762 if (copy_from_user(&info, argp, sizeof(info)))
4763 err = -EFAULT;
4764 else
4765 err = add_new_disk(mddev, &info);
4766 goto done_unlock;
4767 }
4768
4769 case HOT_REMOVE_DISK:
4770 err = hot_remove_disk(mddev, new_decode_dev(arg));
4771 goto done_unlock;
4772
4773 case HOT_ADD_DISK:
4774 err = hot_add_disk(mddev, new_decode_dev(arg));
4775 goto done_unlock;
4776
4777 case SET_DISK_FAULTY:
4778 err = set_disk_faulty(mddev, new_decode_dev(arg));
4779 goto done_unlock;
4780
4781 case RUN_ARRAY:
4782 err = do_md_run (mddev);
4783 goto done_unlock;
4784
32a7627c
N		 4785 case SET_BITMAP_FILE:
4786 err = set_bitmap_file(mddev, (int)arg);
4787 goto done_unlock;
4788
1da177e4 4789 default:
1da177e4
LT		 4790 err = -EINVAL;
4791 goto abort_unlock;
4792 }
4793
4794done_unlock:
4795abort_unlock:
4796 mddev_unlock(mddev);
4797
4798 return err;
4799done:
4800 if (err)
4801 MD_BUG();
4802abort:
4803 return err;
4804}
4805
4806static int md_open(struct inode *inode, struct file *file)
4807{
4808 /*
4809 * Succeed if we can lock the mddev, which confirms that
4810 * it isn't being stopped right now.
4811 */
4812 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4813 int err;
4814
d63a5a74 4815 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
1da177e4
LT		 4816 goto out;
4817
4818 err = 0;
4819 mddev_get(mddev);
4820 mddev_unlock(mddev);
4821
4822 check_disk_change(inode->i_bdev);
4823 out:
4824 return err;
4825}
4826
4827static int md_release(struct inode *inode, struct file * file)
4828{
4829 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4830
52e5f9d1 4831 BUG_ON(!mddev);
1da177e4
LT		 4832 mddev_put(mddev);
4833
4834 return 0;
4835}
4836
44ce6294
LT		 4837static int md_media_changed(struct gendisk *disk)
4838{
4839 mddev_t *mddev = disk->private_data;
4840
4841 return mddev->changed;
4842}
4843
4844static int md_revalidate(struct gendisk *disk)
4845{
4846 mddev_t *mddev = disk->private_data;
4847
4848 mddev->changed = 0;
4849 return 0;
4850}
1da177e4
LT		 4851static struct block_device_operations md_fops =
4852{
4853 .owner = THIS_MODULE,
4854 .open = md_open,
4855 .release = md_release,
4856 .ioctl = md_ioctl,
a885c8c4 4857 .getgeo = md_getgeo,
44ce6294
LT		 4858 .media_changed = md_media_changed,
4859 .revalidate_disk= md_revalidate,
1da177e4
LT		 4860};
4861
75c96f85 4862static int md_thread(void * arg)
1da177e4
LT		 4863{
4864 mdk_thread_t *thread = arg;
4865
1da177e4
LT		 4866 /*
4867 * md_thread is a 'system-thread', it's priority should be very
4868 * high. We avoid resource deadlocks individually in each
4869 * raid personality. (RAID5 does preallocation) We also use RR and
4870 * the very same RT priority as kswapd, thus we will never get
4871 * into a priority inversion deadlock.
4872 *
4873 * we definitely have to have equal or higher priority than
4874 * bdflush, otherwise bdflush will deadlock if there are too
4875 * many dirty RAID5 blocks.
4876 */
1da177e4 4877
6985c43f 4878 allow_signal(SIGKILL);
a6fb0934 4879 while (!kthread_should_stop()) {
1da177e4 4880
93588e22
N		 4881 /* We need to wait INTERRUPTIBLE so that
4882 * we don't add to the load-average.
4883 * That means we need to be sure no signals are
4884 * pending
4885 */
4886 if (signal_pending(current))
4887 flush_signals(current);
4888
4889 wait_event_interruptible_timeout
4890 (thread->wqueue,
4891 test_bit(THREAD_WAKEUP, &thread->flags)
4892 || kthread_should_stop(),
4893 thread->timeout);
1da177e4
LT		 4894
4895 clear_bit(THREAD_WAKEUP, &thread->flags);
4896
787453c2 4897 thread->run(thread->mddev);
1da177e4 4898 }
a6fb0934 4899
1da177e4
LT		 4900 return 0;
4901}
4902
4903void md_wakeup_thread(mdk_thread_t *thread)
4904{
4905 if (thread) {
4906 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4907 set_bit(THREAD_WAKEUP, &thread->flags);
4908 wake_up(&thread->wqueue);
4909 }
4910}
4911
4912mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4913 const char *name)
4914{
4915 mdk_thread_t *thread;
1da177e4 4916
9ffae0cf 4917 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 4918 if (!thread)
4919 return NULL;
4920
1da177e4
LT		 4921 init_waitqueue_head(&thread->wqueue);
4922
1da177e4
LT		 4923 thread->run = run;
4924 thread->mddev = mddev;
32a7627c 4925 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 4926 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 4927 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 4928 kfree(thread);
4929 return NULL;
4930 }
1da177e4
LT		 4931 return thread;
4932}
4933
1da177e4
LT		 4934void md_unregister_thread(mdk_thread_t *thread)
4935{
ba25f9dc 4936 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
a6fb0934
N		 4937
4938 kthread_stop(thread->tsk);
1da177e4
LT		 4939 kfree(thread);
4940}
4941
4942void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4943{
4944 if (!mddev) {
4945 MD_BUG();
4946 return;
4947 }
4948
b2d444d7 4949 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 4950 return;
32a7627c 4951/*
1da177e4
LT		 4952 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4953 mdname(mddev),
4954 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4955 __builtin_return_address(0),__builtin_return_address(1),
4956 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 4957*/
d0a0a5ee
AM		 4958 if (!mddev->pers)
4959 return;
1da177e4
LT		 4960 if (!mddev->pers->error_handler)
4961 return;
4962 mddev->pers->error_handler(mddev,rdev);
4963 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4964 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4965 md_wakeup_thread(mddev->thread);
c331eb04 4966 md_new_event_inintr(mddev);
1da177e4
LT		 4967}
4968
4969/* seq_file implementation /proc/mdstat */
4970
4971static void status_unused(struct seq_file *seq)
4972{
4973 int i = 0;
4974 mdk_rdev_t *rdev;
4975 struct list_head *tmp;
4976
4977 seq_printf(seq, "unused devices: ");
4978
73c34431 4979 rdev_for_each_list(rdev, tmp, pending_raid_disks) {
1da177e4
LT		 4980 char b[BDEVNAME_SIZE];
4981 i++;
4982 seq_printf(seq, "%s ",
4983 bdevname(rdev->bdev,b));
4984 }
4985 if (!i)
4986 seq_printf(seq, "<none>");
4987
4988 seq_printf(seq, "\n");
4989}
4990
4991
4992static void status_resync(struct seq_file *seq, mddev_t * mddev)
4993{
4588b42e
N		 4994 sector_t max_blocks, resync, res;
4995 unsigned long dt, db, rt;
4996 int scale;
4997 unsigned int per_milli;
1da177e4
LT		 4998
4999 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
5000
5001 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5002 max_blocks = mddev->resync_max_sectors >> 1;
5003 else
5004 max_blocks = mddev->size;
5005
5006 /*
5007 * Should not happen.
5008 */
5009 if (!max_blocks) {
5010 MD_BUG();
5011 return;
5012 }
4588b42e
N		 5013 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5014 * in a sector_t, and (max_blocks>>scale) will fit in a
5015 * u32, as those are the requirements for sector_div.
5016 * Thus 'scale' must be at least 10
5017 */
5018 scale = 10;
5019 if (sizeof(sector_t) > sizeof(unsigned long)) {
5020 while ( max_blocks/2 > (1ULL<<(scale+32)))
5021 scale++;
5022 }
5023 res = (resync>>scale)*1000;
5024 sector_div(res, (u32)((max_blocks>>scale)+1));
5025
5026 per_milli = res;
1da177e4 5027 {
4588b42e 5028 int i, x = per_milli/50, y = 20-x;
1da177e4
LT		 5029 seq_printf(seq, "[");
5030 for (i = 0; i < x; i++)
5031 seq_printf(seq, "=");
5032 seq_printf(seq, ">");
5033 for (i = 0; i < y; i++)
5034 seq_printf(seq, ".");
5035 seq_printf(seq, "] ");
5036 }
4588b42e 5037 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
ccfcc3c1
N		 5038 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5039 "reshape" :
61df9d91
N		 5040 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5041 "check" :
5042 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5043 "resync" : "recovery"))),
5044 per_milli/10, per_milli % 10,
4588b42e
N		 5045 (unsigned long long) resync,
5046 (unsigned long long) max_blocks);
1da177e4
LT		 5047
5048 /*
5049 * We do not want to overflow, so the order of operands and
5050 * the * 100 / 100 trick are important. We do a +1 to be
5051 * safe against division by zero. We only estimate anyway.
5052 *
5053 * dt: time from mark until now
5054 * db: blocks written from mark until now
5055 * rt: remaining time
5056 */
5057 dt = ((jiffies - mddev->resync_mark) / HZ);
5058 if (!dt) dt++;
ff4e8d9a
N		 5059 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5060 - mddev->resync_mark_cnt;
5061 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
1da177e4
LT		 5062
5063 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
5064
ff4e8d9a 5065 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
1da177e4
LT		 5066}
5067
5068static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5069{
5070 struct list_head *tmp;
5071 loff_t l = *pos;
5072 mddev_t *mddev;
5073
5074 if (l >= 0x10000)
5075 return NULL;
5076 if (!l--)
5077 /* header */
5078 return (void*)1;
5079
5080 spin_lock(&all_mddevs_lock);
5081 list_for_each(tmp,&all_mddevs)
5082 if (!l--) {
5083 mddev = list_entry(tmp, mddev_t, all_mddevs);
5084 mddev_get(mddev);
5085 spin_unlock(&all_mddevs_lock);
5086 return mddev;
5087 }
5088 spin_unlock(&all_mddevs_lock);
5089 if (!l--)
5090 return (void*)2;/* tail */
5091 return NULL;
5092}
5093
5094static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
5095{
5096 struct list_head *tmp;
5097 mddev_t *next_mddev, *mddev = v;
5098
5099 ++*pos;
5100 if (v == (void*)2)
5101 return NULL;
5102
5103 spin_lock(&all_mddevs_lock);
5104 if (v == (void*)1)
5105 tmp = all_mddevs.next;
5106 else
5107 tmp = mddev->all_mddevs.next;
5108 if (tmp != &all_mddevs)
5109 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
5110 else {
5111 next_mddev = (void*)2;
5112 *pos = 0x10000;
5113 }
5114 spin_unlock(&all_mddevs_lock);
5115
5116 if (v != (void*)1)
5117 mddev_put(mddev);
5118 return next_mddev;
5119
5120}
5121
5122static void md_seq_stop(struct seq_file *seq, void *v)
5123{
5124 mddev_t *mddev = v;
5125
5126 if (mddev && v != (void*)1 && v != (void*)2)
5127 mddev_put(mddev);
5128}
5129
d7603b7e
N		 5130struct mdstat_info {
5131 int event;
5132};
5133
1da177e4
LT		 5134static int md_seq_show(struct seq_file *seq, void *v)
5135{
5136 mddev_t *mddev = v;
5137 sector_t size;
5138 struct list_head *tmp2;
5139 mdk_rdev_t *rdev;
d7603b7e 5140 struct mdstat_info *mi = seq->private;
32a7627c 5141 struct bitmap *bitmap;
1da177e4
LT		 5142
5143 if (v == (void*)1) {
2604b703 5144 struct mdk_personality *pers;
1da177e4
LT		 5145 seq_printf(seq, "Personalities : ");
5146 spin_lock(&pers_lock);
2604b703
N		 5147 list_for_each_entry(pers, &pers_list, list)
5148 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT		 5149
5150 spin_unlock(&pers_lock);
5151 seq_printf(seq, "\n");
d7603b7e 5152 mi->event = atomic_read(&md_event_count);
1da177e4
LT		 5153 return 0;
5154 }
5155 if (v == (void*)2) {
5156 status_unused(seq);
5157 return 0;
5158 }
5159
5dc5cf7d 5160 if (mddev_lock(mddev) < 0)
1da177e4 5161 return -EINTR;
5dc5cf7d 5162
1da177e4
LT		 5163 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5164 seq_printf(seq, "%s : %sactive", mdname(mddev),
5165 mddev->pers ? "" : "in");
5166 if (mddev->pers) {
f91de92e 5167 if (mddev->ro==1)
1da177e4 5168 seq_printf(seq, " (read-only)");
f91de92e 5169 if (mddev->ro==2)
52720ae7 5170 seq_printf(seq, " (auto-read-only)");
1da177e4
LT		 5171 seq_printf(seq, " %s", mddev->pers->name);
5172 }
5173
5174 size = 0;
d089c6af 5175 rdev_for_each(rdev, tmp2, mddev) {
1da177e4
LT		 5176 char b[BDEVNAME_SIZE];
5177 seq_printf(seq, " %s[%d]",
5178 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 5179 if (test_bit(WriteMostly, &rdev->flags))
5180 seq_printf(seq, "(W)");
b2d444d7 5181 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 5182 seq_printf(seq, "(F)");
5183 continue;
b325a32e
N		 5184 } else if (rdev->raid_disk < 0)
5185 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 5186 size += rdev->size;
5187 }
5188
5189 if (!list_empty(&mddev->disks)) {
5190 if (mddev->pers)
5191 seq_printf(seq, "\n %llu blocks",
5192 (unsigned long long)mddev->array_size);
5193 else
5194 seq_printf(seq, "\n %llu blocks",
5195 (unsigned long long)size);
5196 }
1cd6bf19
N		 5197 if (mddev->persistent) {
5198 if (mddev->major_version != 0 ||
5199 mddev->minor_version != 90) {
5200 seq_printf(seq," super %d.%d",
5201 mddev->major_version,
5202 mddev->minor_version);
5203 }
e691063a
N		 5204 } else if (mddev->external)
5205 seq_printf(seq, " super external:%s",
5206 mddev->metadata_type);
5207 else
1cd6bf19 5208 seq_printf(seq, " super non-persistent");
1da177e4
LT		 5209
5210 if (mddev->pers) {
5211 mddev->pers->status (seq, mddev);
5212 seq_printf(seq, "\n ");
8e1b39d6
N		 5213 if (mddev->pers->sync_request) {
5214 if (mddev->curr_resync > 2) {
5215 status_resync (seq, mddev);
5216 seq_printf(seq, "\n ");
5217 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5218 seq_printf(seq, "\tresync=DELAYED\n ");
5219 else if (mddev->recovery_cp < MaxSector)
5220 seq_printf(seq, "\tresync=PENDING\n ");
5221 }
32a7627c
N		 5222 } else
5223 seq_printf(seq, "\n ");
5224
5225 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 5226 unsigned long chunk_kb;
5227 unsigned long flags;
32a7627c
N		 5228 spin_lock_irqsave(&bitmap->lock, flags);
5229 chunk_kb = bitmap->chunksize >> 10;
5230 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5231 "%lu%s chunk",
5232 bitmap->pages - bitmap->missing_pages,
5233 bitmap->pages,
5234 (bitmap->pages - bitmap->missing_pages)
5235 << (PAGE_SHIFT - 10),
5236 chunk_kb ? chunk_kb : bitmap->chunksize,
5237 chunk_kb ? "KB" : "B");
78d742d8
N		 5238 if (bitmap->file) {
5239 seq_printf(seq, ", file: ");
c32c2f63 5240 seq_path(seq, &bitmap->file->f_path, " \t\n");
32a7627c 5241 }
78d742d8 5242
32a7627c
N		 5243 seq_printf(seq, "\n");
5244 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 5245 }
5246
5247 seq_printf(seq, "\n");
5248 }
5249 mddev_unlock(mddev);
5250
5251 return 0;
5252}
5253
5254static struct seq_operations md_seq_ops = {
5255 .start = md_seq_start,
5256 .next = md_seq_next,
5257 .stop = md_seq_stop,
5258 .show = md_seq_show,
5259};
5260
5261static int md_seq_open(struct inode *inode, struct file *file)
5262{
5263 int error;
d7603b7e
N		 5264 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5265 if (mi == NULL)
5266 return -ENOMEM;
1da177e4
LT		 5267
5268 error = seq_open(file, &md_seq_ops);
d7603b7e
N		 5269 if (error)
5270 kfree(mi);
5271 else {
5272 struct seq_file *p = file->private_data;
5273 p->private = mi;
5274 mi->event = atomic_read(&md_event_count);
5275 }
1da177e4
LT		 5276 return error;
5277}
5278
d7603b7e
N		 5279static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5280{
5281 struct seq_file *m = filp->private_data;
5282 struct mdstat_info *mi = m->private;
5283 int mask;
5284
5285 poll_wait(filp, &md_event_waiters, wait);
5286
5287 /* always allow read */
5288 mask = POLLIN | POLLRDNORM;
5289
5290 if (mi->event != atomic_read(&md_event_count))
5291 mask |= POLLERR | POLLPRI;
5292 return mask;
5293}
5294
fa027c2a 5295static const struct file_operations md_seq_fops = {
e24650c2 5296 .owner = THIS_MODULE,
1da177e4
LT		 5297 .open = md_seq_open,
5298 .read = seq_read,
5299 .llseek = seq_lseek,
c3f94b40 5300 .release = seq_release_private,
d7603b7e 5301 .poll = mdstat_poll,
1da177e4
LT		 5302};
5303
2604b703 5304int register_md_personality(struct mdk_personality *p)
1da177e4 5305{
1da177e4 5306 spin_lock(&pers_lock);
2604b703
N		 5307 list_add_tail(&p->list, &pers_list);
5308 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
1da177e4
LT		 5309 spin_unlock(&pers_lock);
5310 return 0;
5311}
5312
2604b703 5313int unregister_md_personality(struct mdk_personality *p)
1da177e4 5314{
2604b703 5315 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 5316 spin_lock(&pers_lock);
2604b703 5317 list_del_init(&p->list);
1da177e4
LT		 5318 spin_unlock(&pers_lock);
5319 return 0;
5320}
5321
5322static int is_mddev_idle(mddev_t *mddev)
5323{
5324 mdk_rdev_t * rdev;
5325 struct list_head *tmp;
5326 int idle;
713f6ab1 5327 long curr_events;
1da177e4
LT		 5328
5329 idle = 1;
d089c6af 5330 rdev_for_each(rdev, tmp, mddev) {
1da177e4 5331 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 5332 curr_events = disk_stat_read(disk, sectors[0]) +
5333 disk_stat_read(disk, sectors[1]) -
1da177e4 5334 atomic_read(&disk->sync_io);
713f6ab1
N		 5335 /* sync IO will cause sync_io to increase before the disk_stats
5336 * as sync_io is counted when a request starts, and
5337 * disk_stats is counted when it completes.
5338 * So resync activity will cause curr_events to be smaller than
5339 * when there was no such activity.
5340 * non-sync IO will cause disk_stat to increase without
5341 * increasing sync_io so curr_events will (eventually)
5342 * be larger than it was before. Once it becomes
5343 * substantially larger, the test below will cause
5344 * the array to appear non-idle, and resync will slow
5345 * down.
5346 * If there is a lot of outstanding resync activity when
5347 * we set last_event to curr_events, then all that activity
5348 * completing might cause the array to appear non-idle
5349 * and resync will be slowed down even though there might
5350 * not have been non-resync activity. This will only
5351 * happen once though. 'last_events' will soon reflect
5352 * the state where there is little or no outstanding
5353 * resync requests, and further resync activity will
5354 * always make curr_events less than last_events.
c0e48521 5355 *
1da177e4 5356 */
713f6ab1 5357 if (curr_events - rdev->last_events > 4096) {
1da177e4
LT		 5358 rdev->last_events = curr_events;
5359 idle = 0;
5360 }
5361 }
5362 return idle;
5363}
5364
5365void md_done_sync(mddev_t *mddev, int blocks, int ok)
5366{
5367 /* another "blocks" (512byte) blocks have been synced */
5368 atomic_sub(blocks, &mddev->recovery_active);
5369 wake_up(&mddev->recovery_wait);
5370 if (!ok) {
5371 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5372 md_wakeup_thread(mddev->thread);
5373 // stop recovery, signal do_sync ....
5374 }
5375}
5376
5377
06d91a5f
N		 5378/* md_write_start(mddev, bi)
5379 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 5380 * in superblock) before writing, schedule a superblock update
5381 * and wait for it to complete.
06d91a5f 5382 */
3d310eb7 5383void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 5384{
06d91a5f 5385 if (bio_data_dir(bi) != WRITE)
3d310eb7 5386 return;
06d91a5f 5387
f91de92e
N		 5388 BUG_ON(mddev->ro == 1);
5389 if (mddev->ro == 2) {
5390 /* need to switch to read/write */
5391 mddev->ro = 0;
5392 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5393 md_wakeup_thread(mddev->thread);
25156198 5394 md_wakeup_thread(mddev->sync_thread);
f91de92e 5395 }
06d91a5f 5396 atomic_inc(&mddev->writes_pending);
31a59e34
N		 5397 if (mddev->safemode == 1)
5398 mddev->safemode = 0;
06d91a5f 5399 if (mddev->in_sync) {
a9701a30 5400 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 5401 if (mddev->in_sync) {
5402 mddev->in_sync = 0;
850b2b42 5403 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3d310eb7
N		 5404 md_wakeup_thread(mddev->thread);
5405 }
a9701a30 5406 spin_unlock_irq(&mddev->write_lock);
06d91a5f 5407 }
850b2b42 5408 wait_event(mddev->sb_wait, mddev->flags==0);
1da177e4
LT		 5409}
5410
5411void md_write_end(mddev_t *mddev)
5412{
5413 if (atomic_dec_and_test(&mddev->writes_pending)) {
5414 if (mddev->safemode == 2)
5415 md_wakeup_thread(mddev->thread);
16f17b39 5416 else if (mddev->safemode_delay)
1da177e4
LT		 5417 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5418 }
5419}
5420
2a2275d6
N		 5421/* md_allow_write(mddev)
5422 * Calling this ensures that the array is marked 'active' so that writes
5423 * may proceed without blocking. It is important to call this before
5424 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5425 * Must be called with mddev_lock held.
5426 */
5427void md_allow_write(mddev_t *mddev)
5428{
5429 if (!mddev->pers)
5430 return;
5431 if (mddev->ro)
5432 return;
5433
5434 spin_lock_irq(&mddev->write_lock);
5435 if (mddev->in_sync) {
5436 mddev->in_sync = 0;
5437 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5438 if (mddev->safemode_delay &&
5439 mddev->safemode == 0)
5440 mddev->safemode = 1;
5441 spin_unlock_irq(&mddev->write_lock);
5442 md_update_sb(mddev, 0);
5443 } else
5444 spin_unlock_irq(&mddev->write_lock);
5445}
5446EXPORT_SYMBOL_GPL(md_allow_write);
5447
75c96f85 5448static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
1da177e4
LT		 5449
5450#define SYNC_MARKS 10
5451#define SYNC_MARK_STEP (3*HZ)
29269553 5452void md_do_sync(mddev_t *mddev)
1da177e4
LT		 5453{
5454 mddev_t *mddev2;
5455 unsigned int currspeed = 0,
5456 window;
57afd89f 5457 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 5458 unsigned long mark[SYNC_MARKS];
5459 sector_t mark_cnt[SYNC_MARKS];
5460 int last_mark,m;
5461 struct list_head *tmp;
5462 sector_t last_check;
57afd89f 5463 int skipped = 0;
5fd6c1dc
N		 5464 struct list_head *rtmp;
5465 mdk_rdev_t *rdev;
61df9d91 5466 char *desc;
1da177e4
LT		 5467
5468 /* just incase thread restarts... */
5469 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5470 return;
5fd6c1dc
N		 5471 if (mddev->ro) /* never try to sync a read-only array */
5472 return;
1da177e4 5473
61df9d91
N		 5474 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5475 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5476 desc = "data-check";
5477 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5478 desc = "requested-resync";
5479 else
5480 desc = "resync";
5481 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5482 desc = "reshape";
5483 else
5484 desc = "recovery";
5485
1da177e4
LT		 5486 /* we overload curr_resync somewhat here.
5487 * 0 == not engaged in resync at all
5488 * 2 == checking that there is no conflict with another sync
5489 * 1 == like 2, but have yielded to allow conflicting resync to
5490 * commense
5491 * other == active in resync - this many blocks
5492 *
5493 * Before starting a resync we must have set curr_resync to
5494 * 2, and then checked that every "conflicting" array has curr_resync
5495 * less than ours. When we find one that is the same or higher
5496 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5497 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5498 * This will mean we have to start checking from the beginning again.
5499 *
5500 */
5501
5502 do {
5503 mddev->curr_resync = 2;
5504
5505 try_again:
787453c2 5506 if (kthread_should_stop()) {
6985c43f 5507 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 5508 goto skip;
5509 }
29ac4aa3 5510 for_each_mddev(mddev2, tmp) {
1da177e4
LT		 5511 if (mddev2 == mddev)
5512 continue;
5513 if (mddev2->curr_resync &&
5514 match_mddev_units(mddev,mddev2)) {
5515 DEFINE_WAIT(wq);
5516 if (mddev < mddev2 && mddev->curr_resync == 2) {
5517 /* arbitrarily yield */
5518 mddev->curr_resync = 1;
5519 wake_up(&resync_wait);
5520 }
5521 if (mddev > mddev2 && mddev->curr_resync == 1)
5522 /* no need to wait here, we can wait the next
5523 * time 'round when curr_resync == 2
5524 */
5525 continue;
787453c2
N		 5526 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5527 if (!kthread_should_stop() &&
8712e553 5528 mddev2->curr_resync >= mddev->curr_resync) {
61df9d91
N		 5529 printk(KERN_INFO "md: delaying %s of %s"
5530 " until %s has finished (they"
1da177e4 5531 " share one or more physical units)\n",
61df9d91 5532 desc, mdname(mddev), mdname(mddev2));
1da177e4
LT		 5533 mddev_put(mddev2);
5534 schedule();
5535 finish_wait(&resync_wait, &wq);
5536 goto try_again;
5537 }
5538 finish_wait(&resync_wait, &wq);
5539 }
5540 }
5541 } while (mddev->curr_resync < 2);
5542
5fd6c1dc 5543 j = 0;
9d88883e 5544 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 5545 /* resync follows the size requested by the personality,
57afd89f 5546 * which defaults to physical size, but can be virtual size
1da177e4
LT		 5547 */
5548 max_sectors = mddev->resync_max_sectors;
9d88883e 5549 mddev->resync_mismatches = 0;
5fd6c1dc
N		 5550 /* we don't use the checkpoint if there's a bitmap */
5551 if (!mddev->bitmap &&
5552 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5553 j = mddev->recovery_cp;
ccfcc3c1
N		 5554 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5555 max_sectors = mddev->size << 1;
5fd6c1dc 5556 else {
1da177e4
LT		 5557 /* recovery follows the physical size of devices */
5558 max_sectors = mddev->size << 1;
5fd6c1dc 5559 j = MaxSector;
d089c6af 5560 rdev_for_each(rdev, rtmp, mddev)
5fd6c1dc
N		 5561 if (rdev->raid_disk >= 0 &&
5562 !test_bit(Faulty, &rdev->flags) &&
5563 !test_bit(In_sync, &rdev->flags) &&
5564 rdev->recovery_offset < j)
5565 j = rdev->recovery_offset;
5566 }
1da177e4 5567
61df9d91
N		 5568 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5569 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5570 " %d KB/sec/disk.\n", speed_min(mddev));
338cec32 5571 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
61df9d91
N		 5572 "(but not more than %d KB/sec) for %s.\n",
5573 speed_max(mddev), desc);
1da177e4
LT		 5574
5575 is_mddev_idle(mddev); /* this also initializes IO event counters */
5fd6c1dc 5576
57afd89f 5577 io_sectors = 0;
1da177e4
LT		 5578 for (m = 0; m < SYNC_MARKS; m++) {
5579 mark[m] = jiffies;
57afd89f 5580 mark_cnt[m] = io_sectors;
1da177e4
LT		 5581 }
5582 last_mark = 0;
5583 mddev->resync_mark = mark[last_mark];
5584 mddev->resync_mark_cnt = mark_cnt[last_mark];
5585
5586 /*
5587 * Tune reconstruction:
5588 */
5589 window = 32*(PAGE_SIZE/512);
5590 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5591 window/2,(unsigned long long) max_sectors/2);
5592
5593 atomic_set(&mddev->recovery_active, 0);
5594 init_waitqueue_head(&mddev->recovery_wait);
5595 last_check = 0;
5596
5597 if (j>2) {
5598 printk(KERN_INFO
61df9d91
N		 5599 "md: resuming %s of %s from checkpoint.\n",
5600 desc, mdname(mddev));
1da177e4
LT		 5601 mddev->curr_resync = j;
5602 }
5603
5604 while (j < max_sectors) {
57afd89f 5605 sector_t sectors;
1da177e4 5606
57afd89f 5607 skipped = 0;
c6207277
N		 5608 if (j >= mddev->resync_max) {
5609 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5610 wait_event(mddev->recovery_wait,
5611 mddev->resync_max > j
5612 || kthread_should_stop());
5613 }
5614 if (kthread_should_stop())
5615 goto interrupted;
57afd89f 5616 sectors = mddev->pers->sync_request(mddev, j, &skipped,
c6207277 5617 currspeed < speed_min(mddev));
57afd89f 5618 if (sectors == 0) {
1da177e4
LT		 5619 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5620 goto out;
5621 }
57afd89f
N		 5622
5623 if (!skipped) { /* actual IO requested */
5624 io_sectors += sectors;
5625 atomic_add(sectors, &mddev->recovery_active);
5626 }
5627
1da177e4
LT		 5628 j += sectors;
5629 if (j>1) mddev->curr_resync = j;
ff4e8d9a 5630 mddev->curr_mark_cnt = io_sectors;
d7603b7e
N		 5631 if (last_check == 0)
5632 /* this is the earliers that rebuilt will be
5633 * visible in /proc/mdstat
5634 */
5635 md_new_event(mddev);
57afd89f
N		 5636
5637 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 5638 continue;
5639
57afd89f 5640 last_check = io_sectors;
1da177e4
LT		 5641
5642 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
5643 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
5644 break;
5645
5646 repeat:
5647 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5648 /* step marks */
5649 int next = (last_mark+1) % SYNC_MARKS;
5650
5651 mddev->resync_mark = mark[next];
5652 mddev->resync_mark_cnt = mark_cnt[next];
5653 mark[next] = jiffies;
57afd89f 5654 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 5655 last_mark = next;
5656 }
5657
5658
c6207277
N		 5659 if (kthread_should_stop())
5660 goto interrupted;
5661
1da177e4
LT		 5662
5663 /*
5664 * this loop exits only if either when we are slower than
5665 * the 'hard' speed limit, or the system was IO-idle for
5666 * a jiffy.
5667 * the system might be non-idle CPU-wise, but we only care
5668 * about not overloading the IO subsystem. (things like an
5669 * e2fsck being done on the RAID array should execute fast)
5670 */
2ad8b1ef 5671 blk_unplug(mddev->queue);
1da177e4
LT		 5672 cond_resched();
5673
57afd89f
N		 5674 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5675 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4 5676
88202a0c
N		 5677 if (currspeed > speed_min(mddev)) {
5678 if ((currspeed > speed_max(mddev)) ||
1da177e4 5679 !is_mddev_idle(mddev)) {
c0e48521 5680 msleep(500);
1da177e4
LT		 5681 goto repeat;
5682 }
5683 }
5684 }
61df9d91 5685 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
1da177e4
LT		 5686 /*
5687 * this also signals 'finished resyncing' to md_stop
5688 */
5689 out:
2ad8b1ef 5690 blk_unplug(mddev->queue);
1da177e4
LT		 5691
5692 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5693
5694 /* tell personality that we are finished */
57afd89f 5695 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 5696
5697 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
ccfcc3c1 5698 !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5fd6c1dc
N		 5699 mddev->curr_resync > 2) {
5700 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5701 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5702 if (mddev->curr_resync >= mddev->recovery_cp) {
5703 printk(KERN_INFO
61df9d91
N		 5704 "md: checkpointing %s of %s.\n",
5705 desc, mdname(mddev));
5fd6c1dc
N		 5706 mddev->recovery_cp = mddev->curr_resync;
5707 }
5708 } else
5709 mddev->recovery_cp = MaxSector;
5710 } else {
5711 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5712 mddev->curr_resync = MaxSector;
d089c6af 5713 rdev_for_each(rdev, rtmp, mddev)
5fd6c1dc
N		 5714 if (rdev->raid_disk >= 0 &&
5715 !test_bit(Faulty, &rdev->flags) &&
5716 !test_bit(In_sync, &rdev->flags) &&
5717 rdev->recovery_offset < mddev->curr_resync)
5718 rdev->recovery_offset = mddev->curr_resync;
5fd6c1dc 5719 }
1da177e4 5720 }
17571284 5721 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 5722
1da177e4
LT		 5723 skip:
5724 mddev->curr_resync = 0;
c6207277
N		 5725 mddev->resync_max = MaxSector;
5726 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
1da177e4
LT		 5727 wake_up(&resync_wait);
5728 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5729 md_wakeup_thread(mddev->thread);
c6207277
N		 5730 return;
5731
5732 interrupted:
5733 /*
5734 * got a signal, exit.
5735 */
5736 printk(KERN_INFO
5737 "md: md_do_sync() got signal ... exiting\n");
5738 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5739 goto out;
5740
1da177e4 5741}
29269553 5742EXPORT_SYMBOL_GPL(md_do_sync);
1da177e4
LT		 5743
5744
b4c4c7b8
N		 5745static int remove_and_add_spares(mddev_t *mddev)
5746{
5747 mdk_rdev_t *rdev;
5748 struct list_head *rtmp;
5749 int spares = 0;
5750
d089c6af 5751 rdev_for_each(rdev, rtmp, mddev)
b4c4c7b8 5752 if (rdev->raid_disk >= 0 &&
c303da6d 5753 !mddev->external &&
b4c4c7b8
N		 5754 (test_bit(Faulty, &rdev->flags) ||
5755 ! test_bit(In_sync, &rdev->flags)) &&
5756 atomic_read(&rdev->nr_pending)==0) {
5757 if (mddev->pers->hot_remove_disk(
5758 mddev, rdev->raid_disk)==0) {
5759 char nm[20];
5760 sprintf(nm,"rd%d", rdev->raid_disk);
5761 sysfs_remove_link(&mddev->kobj, nm);
5762 rdev->raid_disk = -1;
5763 }
5764 }
5765
5766 if (mddev->degraded) {
d089c6af 5767 rdev_for_each(rdev, rtmp, mddev)
b4c4c7b8
N		 5768 if (rdev->raid_disk < 0
5769 && !test_bit(Faulty, &rdev->flags)) {
5770 rdev->recovery_offset = 0;
5771 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5772 char nm[20];
5773 sprintf(nm, "rd%d", rdev->raid_disk);
5e55e2f5
N		 5774 if (sysfs_create_link(&mddev->kobj,
5775 &rdev->kobj, nm))
5776 printk(KERN_WARNING
5777 "md: cannot register "
5778 "%s for %s\n",
5779 nm, mdname(mddev));
b4c4c7b8
N		 5780 spares++;
5781 md_new_event(mddev);
5782 } else
5783 break;
5784 }
5785 }
5786 return spares;
5787}
1da177e4
LT		 5788/*
5789 * This routine is regularly called by all per-raid-array threads to
5790 * deal with generic issues like resync and super-block update.
5791 * Raid personalities that don't have a thread (linear/raid0) do not
5792 * need this as they never do any recovery or update the superblock.
5793 *
5794 * It does not do any resync itself, but rather "forks" off other threads
5795 * to do that as needed.
5796 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5797 * "->recovery" and create a thread at ->sync_thread.
5798 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5799 * and wakeups up this thread which will reap the thread and finish up.
5800 * This thread also removes any faulty devices (with nr_pending == 0).
5801 *
5802 * The overall approach is:
5803 * 1/ if the superblock needs updating, update it.
5804 * 2/ If a recovery thread is running, don't do anything else.
5805 * 3/ If recovery has finished, clean up, possibly marking spares active.
5806 * 4/ If there are any faulty devices, remove them.
5807 * 5/ If array is degraded, try to add spares devices
5808 * 6/ If array has spares or is not in-sync, start a resync thread.
5809 */
5810void md_check_recovery(mddev_t *mddev)
5811{
5812 mdk_rdev_t *rdev;
5813 struct list_head *rtmp;
5814
5815
5f40402d
N		 5816 if (mddev->bitmap)
5817 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 5818
5819 if (mddev->ro)
5820 return;
fca4d848
N		 5821
5822 if (signal_pending(current)) {
31a59e34 5823 if (mddev->pers->sync_request && !mddev->external) {
fca4d848
N		 5824 printk(KERN_INFO "md: %s in immediate safe mode\n",
5825 mdname(mddev));
5826 mddev->safemode = 2;
5827 }
5828 flush_signals(current);
5829 }
5830
1da177e4 5831 if ( ! (
e691063a 5832 (mddev->flags && !mddev->external) ||
1da177e4 5833 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848 5834 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
31a59e34 5835 (mddev->external == 0 && mddev->safemode == 1) ||
fca4d848
N		 5836 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5837 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 5838 ))
5839 return;
fca4d848 5840
df5b89b3 5841 if (mddev_trylock(mddev)) {
b4c4c7b8 5842 int spares = 0;
fca4d848 5843
31a59e34
N		 5844 if (!mddev->external) {
5845 spin_lock_irq(&mddev->write_lock);
5846 if (mddev->safemode &&
5847 !atomic_read(&mddev->writes_pending) &&
5848 !mddev->in_sync &&
5849 mddev->recovery_cp == MaxSector) {
5850 mddev->in_sync = 1;
5851 if (mddev->persistent)
5852 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5853 }
5854 if (mddev->safemode == 1)
5855 mddev->safemode = 0;
5856 spin_unlock_irq(&mddev->write_lock);
fca4d848 5857 }
fca4d848 5858
850b2b42
N		 5859 if (mddev->flags)
5860 md_update_sb(mddev, 0);
06d91a5f 5861
06d91a5f 5862
1da177e4
LT		 5863 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
5864 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
5865 /* resync/recovery still happening */
5866 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5867 goto unlock;
5868 }
5869 if (mddev->sync_thread) {
5870 /* resync has finished, collect result */
5871 md_unregister_thread(mddev->sync_thread);
5872 mddev->sync_thread = NULL;
5873 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5874 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5875 /* success...*/
5876 /* activate any spares */
5877 mddev->pers->spare_active(mddev);
5878 }
850b2b42 5879 md_update_sb(mddev, 1);
41158c7e
N		 5880
5881 /* if array is no-longer degraded, then any saved_raid_disk
5882 * information must be scrapped
5883 */
5884 if (!mddev->degraded)
d089c6af 5885 rdev_for_each(rdev, rtmp, mddev)
41158c7e
N		 5886 rdev->saved_raid_disk = -1;
5887
1da177e4
LT		 5888 mddev->recovery = 0;
5889 /* flag recovery needed just to double check */
5890 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
d7603b7e 5891 md_new_event(mddev);
1da177e4
LT		 5892 goto unlock;
5893 }
24dd469d
N		 5894 /* Clear some bits that don't mean anything, but
5895 * might be left set
5896 */
5897 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5898 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
5899 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
5900 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4 5901
5fd6c1dc
N		 5902 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5903 goto unlock;
1da177e4
LT		 5904 /* no recovery is running.
5905 * remove any failed drives, then
5906 * add spares if possible.
5907 * Spare are also removed and re-added, to allow
5908 * the personality to fail the re-add.
5909 */
1da177e4 5910
b4c4c7b8
N		 5911 if (mddev->reshape_position != MaxSector) {
5912 if (mddev->pers->check_reshape(mddev) != 0)
5913 /* Cannot proceed */
5914 goto unlock;
5915 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
5916 } else if ((spares = remove_and_add_spares(mddev))) {
24dd469d
N		 5917 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5918 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5919 } else if (mddev->recovery_cp < MaxSector) {
5920 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5921 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5922 /* nothing to be done ... */
1da177e4 5923 goto unlock;
24dd469d 5924
1da177e4
LT		 5925 if (mddev->pers->sync_request) {
5926 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 5927 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
5928 /* We are adding a device or devices to an array
5929 * which has the bitmap stored on all devices.
5930 * So make sure all bitmap pages get written
5931 */
5932 bitmap_write_all(mddev->bitmap);
5933 }
1da177e4
LT		 5934 mddev->sync_thread = md_register_thread(md_do_sync,
5935 mddev,
5936 "%s_resync");
5937 if (!mddev->sync_thread) {
5938 printk(KERN_ERR "%s: could not start resync"
5939 " thread...\n",
5940 mdname(mddev));
5941 /* leave the spares where they are, it shouldn't hurt */
5942 mddev->recovery = 0;
d7603b7e 5943 } else
1da177e4 5944 md_wakeup_thread(mddev->sync_thread);
d7603b7e 5945 md_new_event(mddev);
1da177e4
LT		 5946 }
5947 unlock:
5948 mddev_unlock(mddev);
5949 }
5950}
5951
75c96f85
AB		 5952static int md_notify_reboot(struct notifier_block *this,
5953 unsigned long code, void *x)
1da177e4
LT		 5954{
5955 struct list_head *tmp;
5956 mddev_t *mddev;
5957
5958 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
5959
5960 printk(KERN_INFO "md: stopping all md devices.\n");
5961
29ac4aa3 5962 for_each_mddev(mddev, tmp)
c71d4887 5963 if (mddev_trylock(mddev)) {
1da177e4 5964 do_md_stop (mddev, 1);
c71d4887
NB		 5965 mddev_unlock(mddev);
5966 }
1da177e4
LT		 5967 /*
5968 * certain more exotic SCSI devices are known to be
5969 * volatile wrt too early system reboots. While the
5970 * right place to handle this issue is the given
5971 * driver, we do want to have a safe RAID driver ...
5972 */
5973 mdelay(1000*1);
5974 }
5975 return NOTIFY_DONE;
5976}
5977
75c96f85 5978static struct notifier_block md_notifier = {
1da177e4
LT		 5979 .notifier_call = md_notify_reboot,
5980 .next = NULL,
5981 .priority = INT_MAX, /* before any real devices */
5982};
5983
5984static void md_geninit(void)
5985{
1da177e4
LT		 5986 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5987
c7705f34 5988 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
1da177e4
LT		 5989}
5990
75c96f85 5991static int __init md_init(void)
1da177e4 5992{
1da177e4
LT		 5993 if (register_blkdev(MAJOR_NR, "md"))
5994 return -1;
5995 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
5996 unregister_blkdev(MAJOR_NR, "md");
5997 return -1;
5998 }
e8703fe1
N		 5999 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
6000 md_probe, NULL, NULL);
6001 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
1da177e4
LT		 6002 md_probe, NULL, NULL);
6003
1da177e4 6004 register_reboot_notifier(&md_notifier);
0b4d4147 6005 raid_table_header = register_sysctl_table(raid_root_table);
1da177e4
LT		 6006
6007 md_geninit();
6008 return (0);
6009}
6010
6011
6012#ifndef MODULE
6013
6014/*
6015 * Searches all registered partitions for autorun RAID arrays
6016 * at boot time.
6017 */
4d936ec1
ME		 6018
6019static LIST_HEAD(all_detected_devices);
6020struct detected_devices_node {
6021 struct list_head list;
6022 dev_t dev;
6023};
1da177e4
LT		 6024
6025void md_autodetect_dev(dev_t dev)
6026{
4d936ec1
ME		 6027 struct detected_devices_node *node_detected_dev;
6028
6029 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
6030 if (node_detected_dev) {
6031 node_detected_dev->dev = dev;
6032 list_add_tail(&node_detected_dev->list, &all_detected_devices);
6033 } else {
6034 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
6035 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
6036 }
1da177e4
LT		 6037}
6038
6039
6040static void autostart_arrays(int part)
6041{
6042 mdk_rdev_t *rdev;
4d936ec1
ME		 6043 struct detected_devices_node *node_detected_dev;
6044 dev_t dev;
6045 int i_scanned, i_passed;
1da177e4 6046
4d936ec1
ME		 6047 i_scanned = 0;
6048 i_passed = 0;
1da177e4 6049
4d936ec1 6050 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
1da177e4 6051
4d936ec1
ME		 6052 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6053 i_scanned++;
6054 node_detected_dev = list_entry(all_detected_devices.next,
6055 struct detected_devices_node, list);
6056 list_del(&node_detected_dev->list);
6057 dev = node_detected_dev->dev;
6058 kfree(node_detected_dev);
df968c4e 6059 rdev = md_import_device(dev,0, 90);
1da177e4
LT		 6060 if (IS_ERR(rdev))
6061 continue;
6062
b2d444d7 6063 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 6064 MD_BUG();
6065 continue;
6066 }
d0fae18f 6067 set_bit(AutoDetected, &rdev->flags);
1da177e4 6068 list_add(&rdev->same_set, &pending_raid_disks);
4d936ec1 6069 i_passed++;
1da177e4 6070 }
4d936ec1
ME		 6071
6072 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6073 i_scanned, i_passed);
1da177e4
LT		 6074
6075 autorun_devices(part);
6076}
6077
fdee8ae4 6078#endif /* !MODULE */
1da177e4
LT		 6079
6080static __exit void md_exit(void)
6081{
6082 mddev_t *mddev;
6083 struct list_head *tmp;
8ab5e4c1 6084
e8703fe1
N		 6085 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
6086 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
1da177e4
LT		 6087
6088 unregister_blkdev(MAJOR_NR,"md");
6089 unregister_blkdev(mdp_major, "mdp");
6090 unregister_reboot_notifier(&md_notifier);
6091 unregister_sysctl_table(raid_table_header);
6092 remove_proc_entry("mdstat", NULL);
29ac4aa3 6093 for_each_mddev(mddev, tmp) {
1da177e4
LT		 6094 struct gendisk *disk = mddev->gendisk;
6095 if (!disk)
6096 continue;
6097 export_array(mddev);
6098 del_gendisk(disk);
6099 put_disk(disk);
6100 mddev->gendisk = NULL;
6101 mddev_put(mddev);
6102 }
6103}
6104
685784aa 6105subsys_initcall(md_init);
1da177e4
LT		 6106module_exit(md_exit)
6107
f91de92e
N		 6108static int get_ro(char *buffer, struct kernel_param *kp)
6109{
6110 return sprintf(buffer, "%d", start_readonly);
6111}
6112static int set_ro(const char *val, struct kernel_param *kp)
6113{
6114 char *e;
6115 int num = simple_strtoul(val, &e, 10);
6116 if (*val && (*e == '\0' || *e == '\n')) {
6117 start_readonly = num;
4dbcdc75 6118 return 0;
f91de92e
N		 6119 }
6120 return -EINVAL;
6121}
6122
80ca3a44
N		 6123module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6124module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6ff8d8ec 6125
f91de92e 6126
1da177e4
LT		 6127EXPORT_SYMBOL(register_md_personality);
6128EXPORT_SYMBOL(unregister_md_personality);
6129EXPORT_SYMBOL(md_error);
6130EXPORT_SYMBOL(md_done_sync);
6131EXPORT_SYMBOL(md_write_start);
6132EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 6133EXPORT_SYMBOL(md_register_thread);
6134EXPORT_SYMBOL(md_unregister_thread);
6135EXPORT_SYMBOL(md_wakeup_thread);
1da177e4
LT		 6136EXPORT_SYMBOL(md_check_recovery);
6137MODULE_LICENSE("GPL");
aa1595e9 6138MODULE_ALIAS("md");
72008652 6139MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
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