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md: 'sync_action' in sysfs returns wrong value for readonly arrays
[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 */
198#define ITERATE_MDDEV(mddev,tmp) \
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);
eae1701f 234 kobject_unregister(&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;
1da177e4
LT		 278
279 new->queue = blk_alloc_queue(GFP_KERNEL);
280 if (!new->queue) {
281 kfree(new);
282 return NULL;
283 }
89e5c8b5 284 set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags);
1da177e4
LT		 285
286 blk_queue_make_request(new->queue, md_fail_request);
287
288 goto retry;
289}
290
291static inline int mddev_lock(mddev_t * mddev)
292{
df5b89b3 293 return mutex_lock_interruptible(&mddev->reconfig_mutex);
1da177e4
LT		 294}
295
1da177e4
LT		 296static inline int mddev_trylock(mddev_t * mddev)
297{
df5b89b3 298 return mutex_trylock(&mddev->reconfig_mutex);
1da177e4
LT		 299}
300
301static inline void mddev_unlock(mddev_t * mddev)
302{
df5b89b3 303 mutex_unlock(&mddev->reconfig_mutex);
1da177e4 304
005eca5e 305 md_wakeup_thread(mddev->thread);
1da177e4
LT		 306}
307
2989ddbd 308static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
1da177e4
LT		 309{
310 mdk_rdev_t * rdev;
311 struct list_head *tmp;
312
313 ITERATE_RDEV(mddev,rdev,tmp) {
314 if (rdev->desc_nr == nr)
315 return rdev;
316 }
317 return NULL;
318}
319
320static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
321{
322 struct list_head *tmp;
323 mdk_rdev_t *rdev;
324
325 ITERATE_RDEV(mddev,rdev,tmp) {
326 if (rdev->bdev->bd_dev == dev)
327 return rdev;
328 }
329 return NULL;
330}
331
d9d166c2 332static struct mdk_personality *find_pers(int level, char *clevel)
2604b703
N		 333{
334 struct mdk_personality *pers;
d9d166c2
N		 335 list_for_each_entry(pers, &pers_list, list) {
336 if (level != LEVEL_NONE && pers->level == level)
2604b703 337 return pers;
d9d166c2
N		 338 if (strcmp(pers->name, clevel)==0)
339 return pers;
340 }
2604b703
N		 341 return NULL;
342}
343
77933d72 344static inline sector_t calc_dev_sboffset(struct block_device *bdev)
1da177e4
LT		 345{
346 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
347 return MD_NEW_SIZE_BLOCKS(size);
348}
349
350static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
351{
352 sector_t size;
353
354 size = rdev->sb_offset;
355
356 if (chunk_size)
357 size &= ~((sector_t)chunk_size/1024 - 1);
358 return size;
359}
360
361static int alloc_disk_sb(mdk_rdev_t * rdev)
362{
363 if (rdev->sb_page)
364 MD_BUG();
365
366 rdev->sb_page = alloc_page(GFP_KERNEL);
367 if (!rdev->sb_page) {
368 printk(KERN_ALERT "md: out of memory.\n");
369 return -EINVAL;
370 }
371
372 return 0;
373}
374
375static void free_disk_sb(mdk_rdev_t * rdev)
376{
377 if (rdev->sb_page) {
2d1f3b5d 378 put_page(rdev->sb_page);
1da177e4
LT		 379 rdev->sb_loaded = 0;
380 rdev->sb_page = NULL;
381 rdev->sb_offset = 0;
382 rdev->size = 0;
383 }
384}
385
386
6712ecf8 387static void super_written(struct bio *bio, int error)
7bfa19f2
N		 388{
389 mdk_rdev_t *rdev = bio->bi_private;
a9701a30 390 mddev_t *mddev = rdev->mddev;
7bfa19f2 391
3a0f5bbb
N		 392 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
393 printk("md: super_written gets error=%d, uptodate=%d\n",
394 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
395 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
a9701a30 396 md_error(mddev, rdev);
3a0f5bbb 397 }
7bfa19f2 398
a9701a30
N		 399 if (atomic_dec_and_test(&mddev->pending_writes))
400 wake_up(&mddev->sb_wait);
f8b58edf 401 bio_put(bio);
7bfa19f2
N		 402}
403
6712ecf8 404static void super_written_barrier(struct bio *bio, int error)
a9701a30
N		 405{
406 struct bio *bio2 = bio->bi_private;
407 mdk_rdev_t *rdev = bio2->bi_private;
408 mddev_t *mddev = rdev->mddev;
a9701a30
N		 409
410 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
411 error == -EOPNOTSUPP) {
412 unsigned long flags;
413 /* barriers don't appear to be supported :-( */
414 set_bit(BarriersNotsupp, &rdev->flags);
415 mddev->barriers_work = 0;
416 spin_lock_irqsave(&mddev->write_lock, flags);
417 bio2->bi_next = mddev->biolist;
418 mddev->biolist = bio2;
419 spin_unlock_irqrestore(&mddev->write_lock, flags);
420 wake_up(&mddev->sb_wait);
421 bio_put(bio);
6712ecf8
N		 422 } else {
423 bio_put(bio2);
424 bio->bi_private = rdev;
425 super_written(bio, error);
a9701a30 426 }
a9701a30
N		 427}
428
7bfa19f2
N		 429void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
430 sector_t sector, int size, struct page *page)
431{
432 /* write first size bytes of page to sector of rdev
433 * Increment mddev->pending_writes before returning
434 * and decrement it on completion, waking up sb_wait
435 * if zero is reached.
436 * If an error occurred, call md_error
a9701a30
N		 437 *
438 * As we might need to resubmit the request if BIO_RW_BARRIER
439 * causes ENOTSUPP, we allocate a spare bio...
7bfa19f2
N		 440 */
441 struct bio *bio = bio_alloc(GFP_NOIO, 1);
a9701a30 442 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
7bfa19f2
N		 443
444 bio->bi_bdev = rdev->bdev;
445 bio->bi_sector = sector;
446 bio_add_page(bio, page, size, 0);
447 bio->bi_private = rdev;
448 bio->bi_end_io = super_written;
a9701a30
N		 449 bio->bi_rw = rw;
450
7bfa19f2 451 atomic_inc(&mddev->pending_writes);
a9701a30
N		 452 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
453 struct bio *rbio;
454 rw |= (1<<BIO_RW_BARRIER);
455 rbio = bio_clone(bio, GFP_NOIO);
456 rbio->bi_private = bio;
457 rbio->bi_end_io = super_written_barrier;
458 submit_bio(rw, rbio);
459 } else
460 submit_bio(rw, bio);
461}
462
463void md_super_wait(mddev_t *mddev)
464{
465 /* wait for all superblock writes that were scheduled to complete.
466 * if any had to be retried (due to BARRIER problems), retry them
467 */
468 DEFINE_WAIT(wq);
469 for(;;) {
470 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
471 if (atomic_read(&mddev->pending_writes)==0)
472 break;
473 while (mddev->biolist) {
474 struct bio *bio;
475 spin_lock_irq(&mddev->write_lock);
476 bio = mddev->biolist;
477 mddev->biolist = bio->bi_next ;
478 bio->bi_next = NULL;
479 spin_unlock_irq(&mddev->write_lock);
480 submit_bio(bio->bi_rw, bio);
481 }
482 schedule();
483 }
484 finish_wait(&mddev->sb_wait, &wq);
7bfa19f2
N		 485}
486
6712ecf8 487static void bi_complete(struct bio *bio, int error)
1da177e4 488{
1da177e4 489 complete((struct completion*)bio->bi_private);
1da177e4
LT		 490}
491
a654b9d8 492int sync_page_io(struct block_device *bdev, sector_t sector, int size,
1da177e4
LT		 493 struct page *page, int rw)
494{
baaa2c51 495 struct bio *bio = bio_alloc(GFP_NOIO, 1);
1da177e4
LT		 496 struct completion event;
497 int ret;
498
499 rw |= (1 << BIO_RW_SYNC);
500
501 bio->bi_bdev = bdev;
502 bio->bi_sector = sector;
503 bio_add_page(bio, page, size, 0);
504 init_completion(&event);
505 bio->bi_private = &event;
506 bio->bi_end_io = bi_complete;
507 submit_bio(rw, bio);
508 wait_for_completion(&event);
509
510 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
511 bio_put(bio);
512 return ret;
513}
a8745db2 514EXPORT_SYMBOL_GPL(sync_page_io);
1da177e4 515
0002b271 516static int read_disk_sb(mdk_rdev_t * rdev, int size)
1da177e4
LT		 517{
518 char b[BDEVNAME_SIZE];
519 if (!rdev->sb_page) {
520 MD_BUG();
521 return -EINVAL;
522 }
523 if (rdev->sb_loaded)
524 return 0;
525
526
0002b271 527 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
1da177e4
LT		 528 goto fail;
529 rdev->sb_loaded = 1;
530 return 0;
531
532fail:
533 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
534 bdevname(rdev->bdev,b));
535 return -EINVAL;
536}
537
538static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
539{
540 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
541 (sb1->set_uuid1 == sb2->set_uuid1) &&
542 (sb1->set_uuid2 == sb2->set_uuid2) &&
543 (sb1->set_uuid3 == sb2->set_uuid3))
544
545 return 1;
546
547 return 0;
548}
549
550
551static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
552{
553 int ret;
554 mdp_super_t *tmp1, *tmp2;
555
556 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
557 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
558
559 if (!tmp1 || !tmp2) {
560 ret = 0;
561 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
562 goto abort;
563 }
564
565 *tmp1 = *sb1;
566 *tmp2 = *sb2;
567
568 /*
569 * nr_disks is not constant
570 */
571 tmp1->nr_disks = 0;
572 tmp2->nr_disks = 0;
573
574 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
575 ret = 0;
576 else
577 ret = 1;
578
579abort:
990a8baf
JJ		 580 kfree(tmp1);
581 kfree(tmp2);
1da177e4
LT		 582 return ret;
583}
584
4d167f09
N		 585
586static u32 md_csum_fold(u32 csum)
587{
588 csum = (csum & 0xffff) + (csum >> 16);
589 return (csum & 0xffff) + (csum >> 16);
590}
591
1da177e4
LT		 592static unsigned int calc_sb_csum(mdp_super_t * sb)
593{
4d167f09
N		 594 u64 newcsum = 0;
595 u32 *sb32 = (u32*)sb;
596 int i;
1da177e4
LT		 597 unsigned int disk_csum, csum;
598
599 disk_csum = sb->sb_csum;
600 sb->sb_csum = 0;
4d167f09
N		 601
602 for (i = 0; i < MD_SB_BYTES/4 ; i++)
603 newcsum += sb32[i];
604 csum = (newcsum & 0xffffffff) + (newcsum>>32);
605
606
607#ifdef CONFIG_ALPHA
608 /* This used to use csum_partial, which was wrong for several
609 * reasons including that different results are returned on
610 * different architectures. It isn't critical that we get exactly
611 * the same return value as before (we always csum_fold before
612 * testing, and that removes any differences). However as we
613 * know that csum_partial always returned a 16bit value on
614 * alphas, do a fold to maximise conformity to previous behaviour.
615 */
616 sb->sb_csum = md_csum_fold(disk_csum);
617#else
1da177e4 618 sb->sb_csum = disk_csum;
4d167f09 619#endif
1da177e4
LT		 620 return csum;
621}
622
623
624/*
625 * Handle superblock details.
626 * We want to be able to handle multiple superblock formats
627 * so we have a common interface to them all, and an array of
628 * different handlers.
629 * We rely on user-space to write the initial superblock, and support
630 * reading and updating of superblocks.
631 * Interface methods are:
632 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
633 * loads and validates a superblock on dev.
634 * if refdev != NULL, compare superblocks on both devices
635 * Return:
636 * 0 - dev has a superblock that is compatible with refdev
637 * 1 - dev has a superblock that is compatible and newer than refdev
638 * so dev should be used as the refdev in future
639 * -EINVAL superblock incompatible or invalid
640 * -othererror e.g. -EIO
641 *
642 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
643 * Verify that dev is acceptable into mddev.
644 * The first time, mddev->raid_disks will be 0, and data from
645 * dev should be merged in. Subsequent calls check that dev
646 * is new enough. Return 0 or -EINVAL
647 *
648 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
649 * Update the superblock for rdev with data in mddev
650 * This does not write to disc.
651 *
652 */
653
654struct super_type {
655 char *name;
656 struct module *owner;
657 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
658 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
659 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
660};
661
662/*
663 * load_super for 0.90.0
664 */
665static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
666{
667 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
668 mdp_super_t *sb;
669 int ret;
670 sector_t sb_offset;
671
672 /*
673 * Calculate the position of the superblock,
674 * it's at the end of the disk.
675 *
676 * It also happens to be a multiple of 4Kb.
677 */
678 sb_offset = calc_dev_sboffset(rdev->bdev);
679 rdev->sb_offset = sb_offset;
680
0002b271 681 ret = read_disk_sb(rdev, MD_SB_BYTES);
1da177e4
LT		 682 if (ret) return ret;
683
684 ret = -EINVAL;
685
686 bdevname(rdev->bdev, b);
687 sb = (mdp_super_t*)page_address(rdev->sb_page);
688
689 if (sb->md_magic != MD_SB_MAGIC) {
690 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
691 b);
692 goto abort;
693 }
694
695 if (sb->major_version != 0 ||
f6705578
N		 696 sb->minor_version < 90 ||
697 sb->minor_version > 91) {
1da177e4
LT		 698 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
699 sb->major_version, sb->minor_version,
700 b);
701 goto abort;
702 }
703
704 if (sb->raid_disks <= 0)
705 goto abort;
706
4d167f09 707 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1da177e4
LT		 708 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
709 b);
710 goto abort;
711 }
712
713 rdev->preferred_minor = sb->md_minor;
714 rdev->data_offset = 0;
0002b271 715 rdev->sb_size = MD_SB_BYTES;
1da177e4 716
e11e93fa
N		 717 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
718 if (sb->level != 1 && sb->level != 4
719 && sb->level != 5 && sb->level != 6
720 && sb->level != 10) {
721 /* FIXME use a better test */
722 printk(KERN_WARNING
723 "md: bitmaps not supported for this level.\n");
724 goto abort;
725 }
726 }
727
1da177e4
LT		 728 if (sb->level == LEVEL_MULTIPATH)
729 rdev->desc_nr = -1;
730 else
731 rdev->desc_nr = sb->this_disk.number;
732
733 if (refdev == 0)
734 ret = 1;
735 else {
736 __u64 ev1, ev2;
737 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
738 if (!uuid_equal(refsb, sb)) {
739 printk(KERN_WARNING "md: %s has different UUID to %s\n",
740 b, bdevname(refdev->bdev,b2));
741 goto abort;
742 }
743 if (!sb_equal(refsb, sb)) {
744 printk(KERN_WARNING "md: %s has same UUID"
745 " but different superblock to %s\n",
746 b, bdevname(refdev->bdev, b2));
747 goto abort;
748 }
749 ev1 = md_event(sb);
750 ev2 = md_event(refsb);
751 if (ev1 > ev2)
752 ret = 1;
753 else
754 ret = 0;
755 }
756 rdev->size = calc_dev_size(rdev, sb->chunk_size);
757
2bf071bf
N		 758 if (rdev->size < sb->size && sb->level > 1)
759 /* "this cannot possibly happen" ... */
760 ret = -EINVAL;
761
1da177e4
LT		 762 abort:
763 return ret;
764}
765
766/*
767 * validate_super for 0.90.0
768 */
769static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
770{
771 mdp_disk_t *desc;
772 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
07d84d10 773 __u64 ev1 = md_event(sb);
1da177e4 774
41158c7e 775 rdev->raid_disk = -1;
b2d444d7 776 rdev->flags = 0;
1da177e4
LT		 777 if (mddev->raid_disks == 0) {
778 mddev->major_version = 0;
779 mddev->minor_version = sb->minor_version;
780 mddev->patch_version = sb->patch_version;
781 mddev->persistent = ! sb->not_persistent;
782 mddev->chunk_size = sb->chunk_size;
783 mddev->ctime = sb->ctime;
784 mddev->utime = sb->utime;
785 mddev->level = sb->level;
d9d166c2 786 mddev->clevel[0] = 0;
1da177e4
LT		 787 mddev->layout = sb->layout;
788 mddev->raid_disks = sb->raid_disks;
789 mddev->size = sb->size;
07d84d10 790 mddev->events = ev1;
9223214e 791 mddev->bitmap_offset = 0;
36fa3063 792 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
1da177e4 793
f6705578
N		 794 if (mddev->minor_version >= 91) {
795 mddev->reshape_position = sb->reshape_position;
796 mddev->delta_disks = sb->delta_disks;
797 mddev->new_level = sb->new_level;
798 mddev->new_layout = sb->new_layout;
799 mddev->new_chunk = sb->new_chunk;
800 } else {
801 mddev->reshape_position = MaxSector;
802 mddev->delta_disks = 0;
803 mddev->new_level = mddev->level;
804 mddev->new_layout = mddev->layout;
805 mddev->new_chunk = mddev->chunk_size;
806 }
807
1da177e4
LT		 808 if (sb->state & (1<<MD_SB_CLEAN))
809 mddev->recovery_cp = MaxSector;
810 else {
811 if (sb->events_hi == sb->cp_events_hi &&
812 sb->events_lo == sb->cp_events_lo) {
813 mddev->recovery_cp = sb->recovery_cp;
814 } else
815 mddev->recovery_cp = 0;
816 }
817
818 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
819 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
820 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
821 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
822
823 mddev->max_disks = MD_SB_DISKS;
a654b9d8
N		 824
825 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
e11e93fa 826 mddev->bitmap_file == NULL)
36fa3063 827 mddev->bitmap_offset = mddev->default_bitmap_offset;
a654b9d8 828
41158c7e
N		 829 } else if (mddev->pers == NULL) {
830 /* Insist on good event counter while assembling */
1da177e4
LT		 831 ++ev1;
832 if (ev1 < mddev->events)
833 return -EINVAL;
41158c7e
N		 834 } else if (mddev->bitmap) {
835 /* if adding to array with a bitmap, then we can accept an
836 * older device ... but not too old.
837 */
41158c7e
N		 838 if (ev1 < mddev->bitmap->events_cleared)
839 return 0;
07d84d10
N		 840 } else {
841 if (ev1 < mddev->events)
842 /* just a hot-add of a new device, leave raid_disk at -1 */
843 return 0;
844 }
41158c7e 845
1da177e4 846 if (mddev->level != LEVEL_MULTIPATH) {
1da177e4
LT		 847 desc = sb->disks + rdev->desc_nr;
848
849 if (desc->state & (1<<MD_DISK_FAULTY))
b2d444d7 850 set_bit(Faulty, &rdev->flags);
7c7546cc
N		 851 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
852 desc->raid_disk < mddev->raid_disks */) {
b2d444d7 853 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 854 rdev->raid_disk = desc->raid_disk;
855 }
8ddf9efe
N		 856 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
857 set_bit(WriteMostly, &rdev->flags);
41158c7e 858 } else /* MULTIPATH are always insync */
b2d444d7 859 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 860 return 0;
861}
862
863/*
864 * sync_super for 0.90.0
865 */
866static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
867{
868 mdp_super_t *sb;
869 struct list_head *tmp;
870 mdk_rdev_t *rdev2;
871 int next_spare = mddev->raid_disks;
19133a42 872
1da177e4
LT		 873
874 /* make rdev->sb match mddev data..
875 *
876 * 1/ zero out disks
877 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
878 * 3/ any empty disks < next_spare become removed
879 *
880 * disks[0] gets initialised to REMOVED because
881 * we cannot be sure from other fields if it has
882 * been initialised or not.
883 */
884 int i;
885 int active=0, working=0,failed=0,spare=0,nr_disks=0;
886
61181565
N		 887 rdev->sb_size = MD_SB_BYTES;
888
1da177e4
LT		 889 sb = (mdp_super_t*)page_address(rdev->sb_page);
890
891 memset(sb, 0, sizeof(*sb));
892
893 sb->md_magic = MD_SB_MAGIC;
894 sb->major_version = mddev->major_version;
1da177e4
LT		 895 sb->patch_version = mddev->patch_version;
896 sb->gvalid_words = 0; /* ignored */
897 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
898 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
899 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
900 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
901
902 sb->ctime = mddev->ctime;
903 sb->level = mddev->level;
904 sb->size = mddev->size;
905 sb->raid_disks = mddev->raid_disks;
906 sb->md_minor = mddev->md_minor;
907 sb->not_persistent = !mddev->persistent;
908 sb->utime = mddev->utime;
909 sb->state = 0;
910 sb->events_hi = (mddev->events>>32);
911 sb->events_lo = (u32)mddev->events;
912
f6705578
N		 913 if (mddev->reshape_position == MaxSector)
914 sb->minor_version = 90;
915 else {
916 sb->minor_version = 91;
917 sb->reshape_position = mddev->reshape_position;
918 sb->new_level = mddev->new_level;
919 sb->delta_disks = mddev->delta_disks;
920 sb->new_layout = mddev->new_layout;
921 sb->new_chunk = mddev->new_chunk;
922 }
923 mddev->minor_version = sb->minor_version;
1da177e4
LT		 924 if (mddev->in_sync)
925 {
926 sb->recovery_cp = mddev->recovery_cp;
927 sb->cp_events_hi = (mddev->events>>32);
928 sb->cp_events_lo = (u32)mddev->events;
929 if (mddev->recovery_cp == MaxSector)
930 sb->state = (1<< MD_SB_CLEAN);
931 } else
932 sb->recovery_cp = 0;
933
934 sb->layout = mddev->layout;
935 sb->chunk_size = mddev->chunk_size;
936
a654b9d8
N		 937 if (mddev->bitmap && mddev->bitmap_file == NULL)
938 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
939
1da177e4
LT		 940 sb->disks[0].state = (1<<MD_DISK_REMOVED);
941 ITERATE_RDEV(mddev,rdev2,tmp) {
942 mdp_disk_t *d;
86e6ffdd 943 int desc_nr;
b2d444d7
N		 944 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
945 && !test_bit(Faulty, &rdev2->flags))
86e6ffdd 946 desc_nr = rdev2->raid_disk;
1da177e4 947 else
86e6ffdd 948 desc_nr = next_spare++;
19133a42 949 rdev2->desc_nr = desc_nr;
1da177e4
LT		 950 d = &sb->disks[rdev2->desc_nr];
951 nr_disks++;
952 d->number = rdev2->desc_nr;
953 d->major = MAJOR(rdev2->bdev->bd_dev);
954 d->minor = MINOR(rdev2->bdev->bd_dev);
b2d444d7
N		 955 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
956 && !test_bit(Faulty, &rdev2->flags))
1da177e4
LT		 957 d->raid_disk = rdev2->raid_disk;
958 else
959 d->raid_disk = rdev2->desc_nr; /* compatibility */
1be7892f 960 if (test_bit(Faulty, &rdev2->flags))
1da177e4 961 d->state = (1<<MD_DISK_FAULTY);
1be7892f 962 else if (test_bit(In_sync, &rdev2->flags)) {
1da177e4
LT		 963 d->state = (1<<MD_DISK_ACTIVE);
964 d->state |= (1<<MD_DISK_SYNC);
965 active++;
966 working++;
967 } else {
968 d->state = 0;
969 spare++;
970 working++;
971 }
8ddf9efe
N		 972 if (test_bit(WriteMostly, &rdev2->flags))
973 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4 974 }
1da177e4
LT		 975 /* now set the "removed" and "faulty" bits on any missing devices */
976 for (i=0 ; i < mddev->raid_disks ; i++) {
977 mdp_disk_t *d = &sb->disks[i];
978 if (d->state == 0 && d->number == 0) {
979 d->number = i;
980 d->raid_disk = i;
981 d->state = (1<<MD_DISK_REMOVED);
982 d->state |= (1<<MD_DISK_FAULTY);
983 failed++;
984 }
985 }
986 sb->nr_disks = nr_disks;
987 sb->active_disks = active;
988 sb->working_disks = working;
989 sb->failed_disks = failed;
990 sb->spare_disks = spare;
991
992 sb->this_disk = sb->disks[rdev->desc_nr];
993 sb->sb_csum = calc_sb_csum(sb);
994}
995
996/*
997 * version 1 superblock
998 */
999
1c05b4bc 1000static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1da177e4 1001{
1c05b4bc
N		 1002 __le32 disk_csum;
1003 u32 csum;
1da177e4
LT		 1004 unsigned long long newcsum;
1005 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1c05b4bc 1006 __le32 *isuper = (__le32*)sb;
1da177e4
LT		 1007 int i;
1008
1009 disk_csum = sb->sb_csum;
1010 sb->sb_csum = 0;
1011 newcsum = 0;
1012 for (i=0; size>=4; size -= 4 )
1013 newcsum += le32_to_cpu(*isuper++);
1014
1015 if (size == 2)
1c05b4bc 1016 newcsum += le16_to_cpu(*(__le16*) isuper);
1da177e4
LT		 1017
1018 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1019 sb->sb_csum = disk_csum;
1020 return cpu_to_le32(csum);
1021}
1022
1023static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1024{
1025 struct mdp_superblock_1 *sb;
1026 int ret;
1027 sector_t sb_offset;
1028 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 1029 int bmask;
1da177e4
LT		 1030
1031 /*
1032 * Calculate the position of the superblock.
1033 * It is always aligned to a 4K boundary and
1034 * depeding on minor_version, it can be:
1035 * 0: At least 8K, but less than 12K, from end of device
1036 * 1: At start of device
1037 * 2: 4K from start of device.
1038 */
1039 switch(minor_version) {
1040 case 0:
1041 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1042 sb_offset -= 8*2;
39730960 1043 sb_offset &= ~(sector_t)(4*2-1);
1da177e4
LT		 1044 /* convert from sectors to K */
1045 sb_offset /= 2;
1046 break;
1047 case 1:
1048 sb_offset = 0;
1049 break;
1050 case 2:
1051 sb_offset = 4;
1052 break;
1053 default:
1054 return -EINVAL;
1055 }
1056 rdev->sb_offset = sb_offset;
1057
0002b271
N		 1058 /* superblock is rarely larger than 1K, but it can be larger,
1059 * and it is safe to read 4k, so we do that
1060 */
1061 ret = read_disk_sb(rdev, 4096);
1da177e4
LT		 1062 if (ret) return ret;
1063
1064
1065 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1066
1067 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1068 sb->major_version != cpu_to_le32(1) ||
1069 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1070 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
71c0805c 1071 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT		 1072 return -EINVAL;
1073
1074 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1075 printk("md: invalid superblock checksum on %s\n",
1076 bdevname(rdev->bdev,b));
1077 return -EINVAL;
1078 }
1079 if (le64_to_cpu(sb->data_size) < 10) {
1080 printk("md: data_size too small on %s\n",
1081 bdevname(rdev->bdev,b));
1082 return -EINVAL;
1083 }
e11e93fa
N		 1084 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1085 if (sb->level != cpu_to_le32(1) &&
1086 sb->level != cpu_to_le32(4) &&
1087 sb->level != cpu_to_le32(5) &&
1088 sb->level != cpu_to_le32(6) &&
1089 sb->level != cpu_to_le32(10)) {
1090 printk(KERN_WARNING
1091 "md: bitmaps not supported for this level.\n");
1092 return -EINVAL;
1093 }
1094 }
1095
1da177e4
LT		 1096 rdev->preferred_minor = 0xffff;
1097 rdev->data_offset = le64_to_cpu(sb->data_offset);
4dbcdc75 1098 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1da177e4 1099
0002b271 1100 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
720a3dc3 1101 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
0002b271
N		 1102 if (rdev->sb_size & bmask)
1103 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1104
31b65a0d
N		 1105 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1106 rdev->desc_nr = -1;
1107 else
1108 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1109
1da177e4 1110 if (refdev == 0)
8ed75463 1111 ret = 1;
1da177e4
LT		 1112 else {
1113 __u64 ev1, ev2;
1114 struct mdp_superblock_1 *refsb =
1115 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1116
1117 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1118 sb->level != refsb->level ||
1119 sb->layout != refsb->layout ||
1120 sb->chunksize != refsb->chunksize) {
1121 printk(KERN_WARNING "md: %s has strangely different"
1122 " superblock to %s\n",
1123 bdevname(rdev->bdev,b),
1124 bdevname(refdev->bdev,b2));
1125 return -EINVAL;
1126 }
1127 ev1 = le64_to_cpu(sb->events);
1128 ev2 = le64_to_cpu(refsb->events);
1129
1130 if (ev1 > ev2)
8ed75463
N		 1131 ret = 1;
1132 else
1133 ret = 0;
1da177e4
LT		 1134 }
1135 if (minor_version)
1136 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1137 else
1138 rdev->size = rdev->sb_offset;
1139 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1140 return -EINVAL;
1141 rdev->size = le64_to_cpu(sb->data_size)/2;
1142 if (le32_to_cpu(sb->chunksize))
1143 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
2bf071bf 1144
1c05b4bc 1145 if (le64_to_cpu(sb->size) > rdev->size*2)
2bf071bf 1146 return -EINVAL;
8ed75463 1147 return ret;
1da177e4
LT		 1148}
1149
1150static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1151{
1152 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
07d84d10 1153 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4 1154
41158c7e 1155 rdev->raid_disk = -1;
b2d444d7 1156 rdev->flags = 0;
1da177e4
LT		 1157 if (mddev->raid_disks == 0) {
1158 mddev->major_version = 1;
1159 mddev->patch_version = 0;
1160 mddev->persistent = 1;
1161 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1162 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1163 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1164 mddev->level = le32_to_cpu(sb->level);
d9d166c2 1165 mddev->clevel[0] = 0;
1da177e4
LT		 1166 mddev->layout = le32_to_cpu(sb->layout);
1167 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1168 mddev->size = le64_to_cpu(sb->size)/2;
07d84d10 1169 mddev->events = ev1;
9223214e 1170 mddev->bitmap_offset = 0;
29fc7e3e 1171 mddev->default_bitmap_offset = 1024 >> 9;
1da177e4
LT		 1172
1173 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1174 memcpy(mddev->uuid, sb->set_uuid, 16);
1175
1176 mddev->max_disks = (4096-256)/2;
a654b9d8 1177
71c0805c 1178 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
e11e93fa 1179 mddev->bitmap_file == NULL )
a654b9d8 1180 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
e11e93fa 1181
f6705578
N		 1182 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1183 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1184 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1185 mddev->new_level = le32_to_cpu(sb->new_level);
1186 mddev->new_layout = le32_to_cpu(sb->new_layout);
1187 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1188 } else {
1189 mddev->reshape_position = MaxSector;
1190 mddev->delta_disks = 0;
1191 mddev->new_level = mddev->level;
1192 mddev->new_layout = mddev->layout;
1193 mddev->new_chunk = mddev->chunk_size;
1194 }
1195
41158c7e
N		 1196 } else if (mddev->pers == NULL) {
1197 /* Insist of good event counter while assembling */
1da177e4
LT		 1198 ++ev1;
1199 if (ev1 < mddev->events)
1200 return -EINVAL;
41158c7e
N		 1201 } else if (mddev->bitmap) {
1202 /* If adding to array with a bitmap, then we can accept an
1203 * older device, but not too old.
1204 */
41158c7e
N		 1205 if (ev1 < mddev->bitmap->events_cleared)
1206 return 0;
07d84d10
N		 1207 } else {
1208 if (ev1 < mddev->events)
1209 /* just a hot-add of a new device, leave raid_disk at -1 */
1210 return 0;
1211 }
1da177e4
LT		 1212 if (mddev->level != LEVEL_MULTIPATH) {
1213 int role;
1da177e4
LT		 1214 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1215 switch(role) {
1216 case 0xffff: /* spare */
1da177e4
LT		 1217 break;
1218 case 0xfffe: /* faulty */
b2d444d7 1219 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 1220 break;
1221 default:
5fd6c1dc
N		 1222 if ((le32_to_cpu(sb->feature_map) &
1223 MD_FEATURE_RECOVERY_OFFSET))
1224 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1225 else
1226 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1227 rdev->raid_disk = role;
1228 break;
1229 }
8ddf9efe
N		 1230 if (sb->devflags & WriteMostly1)
1231 set_bit(WriteMostly, &rdev->flags);
41158c7e 1232 } else /* MULTIPATH are always insync */
b2d444d7 1233 set_bit(In_sync, &rdev->flags);
41158c7e 1234
1da177e4
LT		 1235 return 0;
1236}
1237
1238static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1239{
1240 struct mdp_superblock_1 *sb;
1241 struct list_head *tmp;
1242 mdk_rdev_t *rdev2;
1243 int max_dev, i;
1244 /* make rdev->sb match mddev and rdev data. */
1245
1246 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1247
1248 sb->feature_map = 0;
1249 sb->pad0 = 0;
5fd6c1dc 1250 sb->recovery_offset = cpu_to_le64(0);
1da177e4
LT		 1251 memset(sb->pad1, 0, sizeof(sb->pad1));
1252 memset(sb->pad2, 0, sizeof(sb->pad2));
1253 memset(sb->pad3, 0, sizeof(sb->pad3));
1254
1255 sb->utime = cpu_to_le64((__u64)mddev->utime);
1256 sb->events = cpu_to_le64(mddev->events);
1257 if (mddev->in_sync)
1258 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1259 else
1260 sb->resync_offset = cpu_to_le64(0);
1261
1c05b4bc 1262 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
4dbcdc75 1263
f0ca340c 1264 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
29fc7e3e 1265 sb->size = cpu_to_le64(mddev->size<<1);
f0ca340c 1266
a654b9d8
N		 1267 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1268 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
71c0805c 1269 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8 1270 }
5fd6c1dc
N		 1271
1272 if (rdev->raid_disk >= 0 &&
1273 !test_bit(In_sync, &rdev->flags) &&
1274 rdev->recovery_offset > 0) {
1275 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1276 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1277 }
1278
f6705578
N		 1279 if (mddev->reshape_position != MaxSector) {
1280 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1281 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1282 sb->new_layout = cpu_to_le32(mddev->new_layout);
1283 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1284 sb->new_level = cpu_to_le32(mddev->new_level);
1285 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1286 }
a654b9d8 1287
1da177e4
LT		 1288 max_dev = 0;
1289 ITERATE_RDEV(mddev,rdev2,tmp)
1290 if (rdev2->desc_nr+1 > max_dev)
1291 max_dev = rdev2->desc_nr+1;
a778b73f
N		 1292
1293 if (max_dev > le32_to_cpu(sb->max_dev))
1294 sb->max_dev = cpu_to_le32(max_dev);
1da177e4
LT		 1295 for (i=0; i<max_dev;i++)
1296 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1297
1298 ITERATE_RDEV(mddev,rdev2,tmp) {
1299 i = rdev2->desc_nr;
b2d444d7 1300 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1301 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1302 else if (test_bit(In_sync, &rdev2->flags))
1da177e4 1303 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
5fd6c1dc
N		 1304 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1305 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1da177e4
LT		 1306 else
1307 sb->dev_roles[i] = cpu_to_le16(0xffff);
1308 }
1309
1da177e4
LT		 1310 sb->sb_csum = calc_sb_1_csum(sb);
1311}
1312
1313
75c96f85 1314static struct super_type super_types[] = {
1da177e4
LT		 1315 [0] = {
1316 .name = "0.90.0",
1317 .owner = THIS_MODULE,
1318 .load_super = super_90_load,
1319 .validate_super = super_90_validate,
1320 .sync_super = super_90_sync,
1321 },
1322 [1] = {
1323 .name = "md-1",
1324 .owner = THIS_MODULE,
1325 .load_super = super_1_load,
1326 .validate_super = super_1_validate,
1327 .sync_super = super_1_sync,
1328 },
1329};
1da177e4
LT		 1330
1331static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1332{
7dd5e7c3
N		 1333 struct list_head *tmp, *tmp2;
1334 mdk_rdev_t *rdev, *rdev2;
1da177e4
LT		 1335
1336 ITERATE_RDEV(mddev1,rdev,tmp)
7dd5e7c3
N		 1337 ITERATE_RDEV(mddev2, rdev2, tmp2)
1338 if (rdev->bdev->bd_contains ==
1339 rdev2->bdev->bd_contains)
1340 return 1;
1da177e4
LT		 1341
1342 return 0;
1343}
1344
1345static LIST_HEAD(pending_raid_disks);
1346
1347static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1348{
7dd5e7c3 1349 char b[BDEVNAME_SIZE];
f637b9f9 1350 struct kobject *ko;
1edf80d3 1351 char *s;
5e55e2f5 1352 int err;
1da177e4
LT		 1353
1354 if (rdev->mddev) {
1355 MD_BUG();
1356 return -EINVAL;
1357 }
2bf071bf
N		 1358 /* make sure rdev->size exceeds mddev->size */
1359 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
a778b73f
N		 1360 if (mddev->pers) {
1361 /* Cannot change size, so fail
1362 * If mddev->level <= 0, then we don't care
1363 * about aligning sizes (e.g. linear)
1364 */
1365 if (mddev->level > 0)
1366 return -ENOSPC;
1367 } else
2bf071bf
N		 1368 mddev->size = rdev->size;
1369 }
1da177e4
LT		 1370
1371 /* Verify rdev->desc_nr is unique.
1372 * If it is -1, assign a free number, else
1373 * check number is not in use
1374 */
1375 if (rdev->desc_nr < 0) {
1376 int choice = 0;
1377 if (mddev->pers) choice = mddev->raid_disks;
1378 while (find_rdev_nr(mddev, choice))
1379 choice++;
1380 rdev->desc_nr = choice;
1381 } else {
1382 if (find_rdev_nr(mddev, rdev->desc_nr))
1383 return -EBUSY;
1384 }
19133a42
N		 1385 bdevname(rdev->bdev,b);
1386 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1387 return -ENOMEM;
1edf80d3
NB		 1388 while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
1389 *s = '!';
1da177e4 1390
1da177e4 1391 rdev->mddev = mddev;
19133a42 1392 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 1393
9c791977 1394 rdev->kobj.parent = &mddev->kobj;
5e55e2f5
N		 1395 if ((err = kobject_add(&rdev->kobj)))
1396 goto fail;
86e6ffdd 1397
f637b9f9
N		 1398 if (rdev->bdev->bd_part)
1399 ko = &rdev->bdev->bd_part->kobj;
1400 else
1401 ko = &rdev->bdev->bd_disk->kobj;
5e55e2f5
N		 1402 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1403 kobject_del(&rdev->kobj);
1404 goto fail;
1405 }
1406 list_add(&rdev->same_set, &mddev->disks);
5463c790 1407 bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
1da177e4 1408 return 0;
5e55e2f5
N		 1409
1410 fail:
1411 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1412 b, mdname(mddev));
1413 return err;
1da177e4
LT		 1414}
1415
5792a285
N		 1416static void delayed_delete(struct work_struct *ws)
1417{
1418 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1419 kobject_del(&rdev->kobj);
1420}
1421
1da177e4
LT		 1422static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1423{
1424 char b[BDEVNAME_SIZE];
1425 if (!rdev->mddev) {
1426 MD_BUG();
1427 return;
1428 }
5463c790 1429 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1da177e4
LT		 1430 list_del_init(&rdev->same_set);
1431 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1432 rdev->mddev = NULL;
86e6ffdd 1433 sysfs_remove_link(&rdev->kobj, "block");
5792a285
N		 1434
1435 /* We need to delay this, otherwise we can deadlock when
1436 * writing to 'remove' to "dev/state"
1437 */
1438 INIT_WORK(&rdev->del_work, delayed_delete);
1439 schedule_work(&rdev->del_work);
1da177e4
LT		 1440}
1441
1442/*
1443 * prevent the device from being mounted, repartitioned or
1444 * otherwise reused by a RAID array (or any other kernel
1445 * subsystem), by bd_claiming the device.
1446 */
1447static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1448{
1449 int err = 0;
1450 struct block_device *bdev;
1451 char b[BDEVNAME_SIZE];
1452
2e7b651d 1453 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1da177e4
LT		 1454 if (IS_ERR(bdev)) {
1455 printk(KERN_ERR "md: could not open %s.\n",
1456 __bdevname(dev, b));
1457 return PTR_ERR(bdev);
1458 }
1459 err = bd_claim(bdev, rdev);
1460 if (err) {
1461 printk(KERN_ERR "md: could not bd_claim %s.\n",
1462 bdevname(bdev, b));
2e7b651d 1463 blkdev_put(bdev);
1da177e4
LT		 1464 return err;
1465 }
1466 rdev->bdev = bdev;
1467 return err;
1468}
1469
1470static void unlock_rdev(mdk_rdev_t *rdev)
1471{
1472 struct block_device *bdev = rdev->bdev;
1473 rdev->bdev = NULL;
1474 if (!bdev)
1475 MD_BUG();
1476 bd_release(bdev);
2e7b651d 1477 blkdev_put(bdev);
1da177e4
LT		 1478}
1479
1480void md_autodetect_dev(dev_t dev);
1481
1482static void export_rdev(mdk_rdev_t * rdev)
1483{
1484 char b[BDEVNAME_SIZE];
1485 printk(KERN_INFO "md: export_rdev(%s)\n",
1486 bdevname(rdev->bdev,b));
1487 if (rdev->mddev)
1488 MD_BUG();
1489 free_disk_sb(rdev);
1490 list_del_init(&rdev->same_set);
1491#ifndef MODULE
1492 md_autodetect_dev(rdev->bdev->bd_dev);
1493#endif
1494 unlock_rdev(rdev);
86e6ffdd 1495 kobject_put(&rdev->kobj);
1da177e4
LT		 1496}
1497
1498static void kick_rdev_from_array(mdk_rdev_t * rdev)
1499{
1500 unbind_rdev_from_array(rdev);
1501 export_rdev(rdev);
1502}
1503
1504static void export_array(mddev_t *mddev)
1505{
1506 struct list_head *tmp;
1507 mdk_rdev_t *rdev;
1508
1509 ITERATE_RDEV(mddev,rdev,tmp) {
1510 if (!rdev->mddev) {
1511 MD_BUG();
1512 continue;
1513 }
1514 kick_rdev_from_array(rdev);
1515 }
1516 if (!list_empty(&mddev->disks))
1517 MD_BUG();
1518 mddev->raid_disks = 0;
1519 mddev->major_version = 0;
1520}
1521
1522static void print_desc(mdp_disk_t *desc)
1523{
1524 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1525 desc->major,desc->minor,desc->raid_disk,desc->state);
1526}
1527
1528static void print_sb(mdp_super_t *sb)
1529{
1530 int i;
1531
1532 printk(KERN_INFO
1533 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1534 sb->major_version, sb->minor_version, sb->patch_version,
1535 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1536 sb->ctime);
1537 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1538 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1539 sb->md_minor, sb->layout, sb->chunk_size);
1540 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1541 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1542 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1543 sb->failed_disks, sb->spare_disks,
1544 sb->sb_csum, (unsigned long)sb->events_lo);
1545
1546 printk(KERN_INFO);
1547 for (i = 0; i < MD_SB_DISKS; i++) {
1548 mdp_disk_t *desc;
1549
1550 desc = sb->disks + i;
1551 if (desc->number || desc->major || desc->minor ||
1552 desc->raid_disk || (desc->state && (desc->state != 4))) {
1553 printk(" D %2d: ", i);
1554 print_desc(desc);
1555 }
1556 }
1557 printk(KERN_INFO "md: THIS: ");
1558 print_desc(&sb->this_disk);
1559
1560}
1561
1562static void print_rdev(mdk_rdev_t *rdev)
1563{
1564 char b[BDEVNAME_SIZE];
1565 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1566 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
b2d444d7
N		 1567 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1568 rdev->desc_nr);
1da177e4
LT		 1569 if (rdev->sb_loaded) {
1570 printk(KERN_INFO "md: rdev superblock:\n");
1571 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1572 } else
1573 printk(KERN_INFO "md: no rdev superblock!\n");
1574}
1575
5e56341d 1576static void md_print_devices(void)
1da177e4
LT		 1577{
1578 struct list_head *tmp, *tmp2;
1579 mdk_rdev_t *rdev;
1580 mddev_t *mddev;
1581 char b[BDEVNAME_SIZE];
1582
1583 printk("\n");
1584 printk("md: **********************************\n");
1585 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1586 printk("md: **********************************\n");
1587 ITERATE_MDDEV(mddev,tmp) {
1da177e4 1588
32a7627c
N		 1589 if (mddev->bitmap)
1590 bitmap_print_sb(mddev->bitmap);
1591 else
1592 printk("%s: ", mdname(mddev));
1da177e4
LT		 1593 ITERATE_RDEV(mddev,rdev,tmp2)
1594 printk("<%s>", bdevname(rdev->bdev,b));
1595 printk("\n");
1596
1597 ITERATE_RDEV(mddev,rdev,tmp2)
1598 print_rdev(rdev);
1599 }
1600 printk("md: **********************************\n");
1601 printk("\n");
1602}
1603
1604
42543769 1605static void sync_sbs(mddev_t * mddev, int nospares)
1da177e4 1606{
42543769
N		 1607 /* Update each superblock (in-memory image), but
1608 * if we are allowed to, skip spares which already
1609 * have the right event counter, or have one earlier
1610 * (which would mean they aren't being marked as dirty
1611 * with the rest of the array)
1612 */
1da177e4
LT		 1613 mdk_rdev_t *rdev;
1614 struct list_head *tmp;
1615
1616 ITERATE_RDEV(mddev,rdev,tmp) {
42543769
N		 1617 if (rdev->sb_events == mddev->events ||
1618 (nospares &&
1619 rdev->raid_disk < 0 &&
1620 (rdev->sb_events&1)==0 &&
1621 rdev->sb_events+1 == mddev->events)) {
1622 /* Don't update this superblock */
1623 rdev->sb_loaded = 2;
1624 } else {
1625 super_types[mddev->major_version].
1626 sync_super(mddev, rdev);
1627 rdev->sb_loaded = 1;
1628 }
1da177e4
LT		 1629 }
1630}
1631
850b2b42 1632static void md_update_sb(mddev_t * mddev, int force_change)
1da177e4 1633{
1da177e4
LT		 1634 struct list_head *tmp;
1635 mdk_rdev_t *rdev;
06d91a5f 1636 int sync_req;
42543769 1637 int nospares = 0;
1da177e4 1638
1da177e4 1639repeat:
a9701a30 1640 spin_lock_irq(&mddev->write_lock);
84692195 1641
850b2b42
N		 1642 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1643 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1644 force_change = 1;
1645 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1646 /* just a clean<-> dirty transition, possibly leave spares alone,
1647 * though if events isn't the right even/odd, we will have to do
1648 * spares after all
1649 */
1650 nospares = 1;
1651 if (force_change)
1652 nospares = 0;
1653 if (mddev->degraded)
84692195
N		 1654 /* If the array is degraded, then skipping spares is both
1655 * dangerous and fairly pointless.
1656 * Dangerous because a device that was removed from the array
1657 * might have a event_count that still looks up-to-date,
1658 * so it can be re-added without a resync.
1659 * Pointless because if there are any spares to skip,
1660 * then a recovery will happen and soon that array won't
1661 * be degraded any more and the spare can go back to sleep then.
1662 */
850b2b42 1663 nospares = 0;
84692195 1664
06d91a5f 1665 sync_req = mddev->in_sync;
1da177e4 1666 mddev->utime = get_seconds();
42543769
N		 1667
1668 /* If this is just a dirty<->clean transition, and the array is clean
1669 * and 'events' is odd, we can roll back to the previous clean state */
850b2b42 1670 if (nospares
42543769 1671 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1031be7a
N		 1672 && (mddev->events & 1)
1673 && mddev->events != 1)
42543769
N		 1674 mddev->events--;
1675 else {
1676 /* otherwise we have to go forward and ... */
1677 mddev->events ++;
1678 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1679 /* .. if the array isn't clean, insist on an odd 'events' */
1680 if ((mddev->events&1)==0) {
1681 mddev->events++;
1682 nospares = 0;
1683 }
1684 } else {
1685 /* otherwise insist on an even 'events' (for clean states) */
1686 if ((mddev->events&1)) {
1687 mddev->events++;
1688 nospares = 0;
1689 }
1690 }
1691 }
1da177e4
LT		 1692
1693 if (!mddev->events) {
1694 /*
1695 * oops, this 64-bit counter should never wrap.
1696 * Either we are in around ~1 trillion A.C., assuming
1697 * 1 reboot per second, or we have a bug:
1698 */
1699 MD_BUG();
1700 mddev->events --;
1701 }
42543769 1702 sync_sbs(mddev, nospares);
1da177e4
LT		 1703
1704 /*
1705 * do not write anything to disk if using
1706 * nonpersistent superblocks
1707 */
06d91a5f 1708 if (!mddev->persistent) {
850b2b42 1709 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
a9701a30 1710 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1711 wake_up(&mddev->sb_wait);
1da177e4 1712 return;
06d91a5f 1713 }
a9701a30 1714 spin_unlock_irq(&mddev->write_lock);
1da177e4
LT		 1715
1716 dprintk(KERN_INFO
1717 "md: updating %s RAID superblock on device (in sync %d)\n",
1718 mdname(mddev),mddev->in_sync);
1719
4ad13663 1720 bitmap_update_sb(mddev->bitmap);
1da177e4
LT		 1721 ITERATE_RDEV(mddev,rdev,tmp) {
1722 char b[BDEVNAME_SIZE];
1723 dprintk(KERN_INFO "md: ");
42543769
N		 1724 if (rdev->sb_loaded != 1)
1725 continue; /* no noise on spare devices */
b2d444d7 1726 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1727 dprintk("(skipping faulty ");
1728
1729 dprintk("%s ", bdevname(rdev->bdev,b));
b2d444d7 1730 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 1731 md_super_write(mddev,rdev,
0002b271 1732 rdev->sb_offset<<1, rdev->sb_size,
7bfa19f2
N		 1733 rdev->sb_page);
1734 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1735 bdevname(rdev->bdev,b),
1736 (unsigned long long)rdev->sb_offset);
42543769 1737 rdev->sb_events = mddev->events;
7bfa19f2 1738
1da177e4
LT		 1739 } else
1740 dprintk(")\n");
7bfa19f2 1741 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT		 1742 /* only need to write one superblock... */
1743 break;
1744 }
a9701a30 1745 md_super_wait(mddev);
850b2b42 1746 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
7bfa19f2 1747
a9701a30 1748 spin_lock_irq(&mddev->write_lock);
850b2b42
N		 1749 if (mddev->in_sync != sync_req ||
1750 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
06d91a5f 1751 /* have to write it out again */
a9701a30 1752 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N		 1753 goto repeat;
1754 }
850b2b42 1755 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
a9701a30 1756 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1757 wake_up(&mddev->sb_wait);
06d91a5f 1758
1da177e4
LT		 1759}
1760
bce74dac
N		 1761/* words written to sysfs files may, or my not, be \n terminated.
1762 * We want to accept with case. For this we use cmd_match.
1763 */
1764static int cmd_match(const char *cmd, const char *str)
1765{
1766 /* See if cmd, written into a sysfs file, matches
1767 * str. They must either be the same, or cmd can
1768 * have a trailing newline
1769 */
1770 while (*cmd && *str && *cmd == *str) {
1771 cmd++;
1772 str++;
1773 }
1774 if (*cmd == '\n')
1775 cmd++;
1776 if (*str || *cmd)
1777 return 0;
1778 return 1;
1779}
1780
86e6ffdd
N		 1781struct rdev_sysfs_entry {
1782 struct attribute attr;
1783 ssize_t (*show)(mdk_rdev_t *, char *);
1784 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1785};
1786
1787static ssize_t
96de1e66 1788state_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1789{
1790 char *sep = "";
1791 int len=0;
1792
b2d444d7 1793 if (test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 1794 len+= sprintf(page+len, "%sfaulty",sep);
1795 sep = ",";
1796 }
b2d444d7 1797 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1798 len += sprintf(page+len, "%sin_sync",sep);
1799 sep = ",";
1800 }
f655675b
N		 1801 if (test_bit(WriteMostly, &rdev->flags)) {
1802 len += sprintf(page+len, "%swrite_mostly",sep);
1803 sep = ",";
1804 }
b2d444d7
N		 1805 if (!test_bit(Faulty, &rdev->flags) &&
1806 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1807 len += sprintf(page+len, "%sspare", sep);
1808 sep = ",";
1809 }
1810 return len+sprintf(page+len, "\n");
1811}
1812
45dc2de1
N		 1813static ssize_t
1814state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1815{
1816 /* can write
1817 * faulty - simulates and error
1818 * remove - disconnects the device
f655675b
N		 1819 * writemostly - sets write_mostly
1820 * -writemostly - clears write_mostly
45dc2de1
N		 1821 */
1822 int err = -EINVAL;
1823 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1824 md_error(rdev->mddev, rdev);
1825 err = 0;
1826 } else if (cmd_match(buf, "remove")) {
1827 if (rdev->raid_disk >= 0)
1828 err = -EBUSY;
1829 else {
1830 mddev_t *mddev = rdev->mddev;
1831 kick_rdev_from_array(rdev);
3f9d7b0d
N		 1832 if (mddev->pers)
1833 md_update_sb(mddev, 1);
45dc2de1
N		 1834 md_new_event(mddev);
1835 err = 0;
1836 }
f655675b
N		 1837 } else if (cmd_match(buf, "writemostly")) {
1838 set_bit(WriteMostly, &rdev->flags);
1839 err = 0;
1840 } else if (cmd_match(buf, "-writemostly")) {
1841 clear_bit(WriteMostly, &rdev->flags);
1842 err = 0;
45dc2de1
N		 1843 }
1844 return err ? err : len;
1845}
80ca3a44
N		 1846static struct rdev_sysfs_entry rdev_state =
1847__ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
86e6ffdd
N		 1848
1849static ssize_t
96de1e66 1850super_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1851{
1852 if (rdev->sb_loaded && rdev->sb_size) {
1853 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1854 return rdev->sb_size;
1855 } else
1856 return 0;
1857}
96de1e66
N		 1858static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1859
4dbcdc75
N		 1860static ssize_t
1861errors_show(mdk_rdev_t *rdev, char *page)
1862{
1863 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1864}
1865
1866static ssize_t
1867errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1868{
1869 char *e;
1870 unsigned long n = simple_strtoul(buf, &e, 10);
1871 if (*buf && (*e == 0 || *e == '\n')) {
1872 atomic_set(&rdev->corrected_errors, n);
1873 return len;
1874 }
1875 return -EINVAL;
1876}
1877static struct rdev_sysfs_entry rdev_errors =
80ca3a44 1878__ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
4dbcdc75 1879
014236d2
N		 1880static ssize_t
1881slot_show(mdk_rdev_t *rdev, char *page)
1882{
1883 if (rdev->raid_disk < 0)
1884 return sprintf(page, "none\n");
1885 else
1886 return sprintf(page, "%d\n", rdev->raid_disk);
1887}
1888
1889static ssize_t
1890slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1891{
1892 char *e;
1893 int slot = simple_strtoul(buf, &e, 10);
1894 if (strncmp(buf, "none", 4)==0)
1895 slot = -1;
1896 else if (e==buf || (*e && *e!= '\n'))
1897 return -EINVAL;
1898 if (rdev->mddev->pers)
1899 /* Cannot set slot in active array (yet) */
1900 return -EBUSY;
1901 if (slot >= rdev->mddev->raid_disks)
1902 return -ENOSPC;
1903 rdev->raid_disk = slot;
1904 /* assume it is working */
1905 rdev->flags = 0;
1906 set_bit(In_sync, &rdev->flags);
1907 return len;
1908}
1909
1910
1911static struct rdev_sysfs_entry rdev_slot =
80ca3a44 1912__ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
014236d2 1913
93c8cad0
N		 1914static ssize_t
1915offset_show(mdk_rdev_t *rdev, char *page)
1916{
6961ece4 1917 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
93c8cad0
N		 1918}
1919
1920static ssize_t
1921offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1922{
1923 char *e;
1924 unsigned long long offset = simple_strtoull(buf, &e, 10);
1925 if (e==buf || (*e && *e != '\n'))
1926 return -EINVAL;
1927 if (rdev->mddev->pers)
1928 return -EBUSY;
1929 rdev->data_offset = offset;
1930 return len;
1931}
1932
1933static struct rdev_sysfs_entry rdev_offset =
80ca3a44 1934__ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
93c8cad0 1935
83303b61
N		 1936static ssize_t
1937rdev_size_show(mdk_rdev_t *rdev, char *page)
1938{
1939 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1940}
1941
1942static ssize_t
1943rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1944{
1945 char *e;
1946 unsigned long long size = simple_strtoull(buf, &e, 10);
1947 if (e==buf || (*e && *e != '\n'))
1948 return -EINVAL;
1949 if (rdev->mddev->pers)
1950 return -EBUSY;
1951 rdev->size = size;
1952 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1953 rdev->mddev->size = size;
1954 return len;
1955}
1956
1957static struct rdev_sysfs_entry rdev_size =
80ca3a44 1958__ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
83303b61 1959
86e6ffdd
N		 1960static struct attribute *rdev_default_attrs[] = {
1961 &rdev_state.attr,
1962 &rdev_super.attr,
4dbcdc75 1963 &rdev_errors.attr,
014236d2 1964 &rdev_slot.attr,
93c8cad0 1965 &rdev_offset.attr,
83303b61 1966 &rdev_size.attr,
86e6ffdd
N		 1967 NULL,
1968};
1969static ssize_t
1970rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1971{
1972 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1973 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1974
1975 if (!entry->show)
1976 return -EIO;
1977 return entry->show(rdev, page);
1978}
1979
1980static ssize_t
1981rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1982 const char *page, size_t length)
1983{
1984 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1985 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1986
1987 if (!entry->store)
1988 return -EIO;
67463acb
N		 1989 if (!capable(CAP_SYS_ADMIN))
1990 return -EACCES;
86e6ffdd
N		 1991 return entry->store(rdev, page, length);
1992}
1993
1994static void rdev_free(struct kobject *ko)
1995{
1996 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1997 kfree(rdev);
1998}
1999static struct sysfs_ops rdev_sysfs_ops = {
2000 .show = rdev_attr_show,
2001 .store = rdev_attr_store,
2002};
2003static struct kobj_type rdev_ktype = {
2004 .release = rdev_free,
2005 .sysfs_ops = &rdev_sysfs_ops,
2006 .default_attrs = rdev_default_attrs,
2007};
2008
1da177e4
LT		 2009/*
2010 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2011 *
2012 * mark the device faulty if:
2013 *
2014 * - the device is nonexistent (zero size)
2015 * - the device has no valid superblock
2016 *
2017 * a faulty rdev _never_ has rdev->sb set.
2018 */
2019static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2020{
2021 char b[BDEVNAME_SIZE];
2022 int err;
2023 mdk_rdev_t *rdev;
2024 sector_t size;
2025
9ffae0cf 2026 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1da177e4
LT		 2027 if (!rdev) {
2028 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2029 return ERR_PTR(-ENOMEM);
2030 }
1da177e4
LT		 2031
2032 if ((err = alloc_disk_sb(rdev)))
2033 goto abort_free;
2034
2035 err = lock_rdev(rdev, newdev);
2036 if (err)
2037 goto abort_free;
2038
86e6ffdd
N		 2039 rdev->kobj.parent = NULL;
2040 rdev->kobj.ktype = &rdev_ktype;
2041 kobject_init(&rdev->kobj);
2042
1da177e4 2043 rdev->desc_nr = -1;
2b6e8459 2044 rdev->saved_raid_disk = -1;
3f9d7b0d 2045 rdev->raid_disk = -1;
b2d444d7 2046 rdev->flags = 0;
1da177e4 2047 rdev->data_offset = 0;
42543769 2048 rdev->sb_events = 0;
1da177e4 2049 atomic_set(&rdev->nr_pending, 0);
ba22dcbf 2050 atomic_set(&rdev->read_errors, 0);
4dbcdc75 2051 atomic_set(&rdev->corrected_errors, 0);
1da177e4
LT		 2052
2053 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2054 if (!size) {
2055 printk(KERN_WARNING
2056 "md: %s has zero or unknown size, marking faulty!\n",
2057 bdevname(rdev->bdev,b));
2058 err = -EINVAL;
2059 goto abort_free;
2060 }
2061
2062 if (super_format >= 0) {
2063 err = super_types[super_format].
2064 load_super(rdev, NULL, super_minor);
2065 if (err == -EINVAL) {
df968c4e
N		 2066 printk(KERN_WARNING
2067 "md: %s does not have a valid v%d.%d "
2068 "superblock, not importing!\n",
2069 bdevname(rdev->bdev,b),
2070 super_format, super_minor);
1da177e4
LT		 2071 goto abort_free;
2072 }
2073 if (err < 0) {
2074 printk(KERN_WARNING
2075 "md: could not read %s's sb, not importing!\n",
2076 bdevname(rdev->bdev,b));
2077 goto abort_free;
2078 }
2079 }
2080 INIT_LIST_HEAD(&rdev->same_set);
2081
2082 return rdev;
2083
2084abort_free:
2085 if (rdev->sb_page) {
2086 if (rdev->bdev)
2087 unlock_rdev(rdev);
2088 free_disk_sb(rdev);
2089 }
2090 kfree(rdev);
2091 return ERR_PTR(err);
2092}
2093
2094/*
2095 * Check a full RAID array for plausibility
2096 */
2097
2098
a757e64c 2099static void analyze_sbs(mddev_t * mddev)
1da177e4
LT		 2100{
2101 int i;
2102 struct list_head *tmp;
2103 mdk_rdev_t *rdev, *freshest;
2104 char b[BDEVNAME_SIZE];
2105
2106 freshest = NULL;
2107 ITERATE_RDEV(mddev,rdev,tmp)
2108 switch (super_types[mddev->major_version].
2109 load_super(rdev, freshest, mddev->minor_version)) {
2110 case 1:
2111 freshest = rdev;
2112 break;
2113 case 0:
2114 break;
2115 default:
2116 printk( KERN_ERR \
2117 "md: fatal superblock inconsistency in %s"
2118 " -- removing from array\n",
2119 bdevname(rdev->bdev,b));
2120 kick_rdev_from_array(rdev);
2121 }
2122
2123
2124 super_types[mddev->major_version].
2125 validate_super(mddev, freshest);
2126
2127 i = 0;
2128 ITERATE_RDEV(mddev,rdev,tmp) {
2129 if (rdev != freshest)
2130 if (super_types[mddev->major_version].
2131 validate_super(mddev, rdev)) {
2132 printk(KERN_WARNING "md: kicking non-fresh %s"
2133 " from array!\n",
2134 bdevname(rdev->bdev,b));
2135 kick_rdev_from_array(rdev);
2136 continue;
2137 }
2138 if (mddev->level == LEVEL_MULTIPATH) {
2139 rdev->desc_nr = i++;
2140 rdev->raid_disk = rdev->desc_nr;
b2d444d7 2141 set_bit(In_sync, &rdev->flags);
a778b73f
N		 2142 } else if (rdev->raid_disk >= mddev->raid_disks) {
2143 rdev->raid_disk = -1;
2144 clear_bit(In_sync, &rdev->flags);
1da177e4
LT		 2145 }
2146 }
2147
2148
2149
2150 if (mddev->recovery_cp != MaxSector &&
2151 mddev->level >= 1)
2152 printk(KERN_ERR "md: %s: raid array is not clean"
2153 " -- starting background reconstruction\n",
2154 mdname(mddev));
2155
1da177e4
LT		 2156}
2157
16f17b39
N		 2158static ssize_t
2159safe_delay_show(mddev_t *mddev, char *page)
2160{
2161 int msec = (mddev->safemode_delay*1000)/HZ;
2162 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2163}
2164static ssize_t
2165safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2166{
2167 int scale=1;
2168 int dot=0;
2169 int i;
2170 unsigned long msec;
2171 char buf[30];
2172 char *e;
2173 /* remove a period, and count digits after it */
2174 if (len >= sizeof(buf))
2175 return -EINVAL;
2176 strlcpy(buf, cbuf, len);
2177 buf[len] = 0;
2178 for (i=0; i<len; i++) {
2179 if (dot) {
2180 if (isdigit(buf[i])) {
2181 buf[i-1] = buf[i];
2182 scale *= 10;
2183 }
2184 buf[i] = 0;
2185 } else if (buf[i] == '.') {
2186 dot=1;
2187 buf[i] = 0;
2188 }
2189 }
2190 msec = simple_strtoul(buf, &e, 10);
2191 if (e == buf || (*e && *e != '\n'))
2192 return -EINVAL;
2193 msec = (msec * 1000) / scale;
2194 if (msec == 0)
2195 mddev->safemode_delay = 0;
2196 else {
2197 mddev->safemode_delay = (msec*HZ)/1000;
2198 if (mddev->safemode_delay == 0)
2199 mddev->safemode_delay = 1;
2200 }
2201 return len;
2202}
2203static struct md_sysfs_entry md_safe_delay =
80ca3a44 2204__ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
16f17b39 2205
eae1701f 2206static ssize_t
96de1e66 2207level_show(mddev_t *mddev, char *page)
eae1701f 2208{
2604b703 2209 struct mdk_personality *p = mddev->pers;
d9d166c2 2210 if (p)
eae1701f 2211 return sprintf(page, "%s\n", p->name);
d9d166c2
N		 2212 else if (mddev->clevel[0])
2213 return sprintf(page, "%s\n", mddev->clevel);
2214 else if (mddev->level != LEVEL_NONE)
2215 return sprintf(page, "%d\n", mddev->level);
2216 else
2217 return 0;
eae1701f
N		 2218}
2219
d9d166c2
N		 2220static ssize_t
2221level_store(mddev_t *mddev, const char *buf, size_t len)
2222{
2223 int rv = len;
2224 if (mddev->pers)
2225 return -EBUSY;
2226 if (len == 0)
2227 return 0;
2228 if (len >= sizeof(mddev->clevel))
2229 return -ENOSPC;
2230 strncpy(mddev->clevel, buf, len);
2231 if (mddev->clevel[len-1] == '\n')
2232 len--;
2233 mddev->clevel[len] = 0;
2234 mddev->level = LEVEL_NONE;
2235 return rv;
2236}
2237
2238static struct md_sysfs_entry md_level =
80ca3a44 2239__ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
eae1701f 2240
d4dbd025
N		 2241
2242static ssize_t
2243layout_show(mddev_t *mddev, char *page)
2244{
2245 /* just a number, not meaningful for all levels */
08a02ecd
N		 2246 if (mddev->reshape_position != MaxSector &&
2247 mddev->layout != mddev->new_layout)
2248 return sprintf(page, "%d (%d)\n",
2249 mddev->new_layout, mddev->layout);
d4dbd025
N		 2250 return sprintf(page, "%d\n", mddev->layout);
2251}
2252
2253static ssize_t
2254layout_store(mddev_t *mddev, const char *buf, size_t len)
2255{
2256 char *e;
2257 unsigned long n = simple_strtoul(buf, &e, 10);
d4dbd025
N		 2258
2259 if (!*buf || (*e && *e != '\n'))
2260 return -EINVAL;
2261
08a02ecd
N		 2262 if (mddev->pers)
2263 return -EBUSY;
2264 if (mddev->reshape_position != MaxSector)
2265 mddev->new_layout = n;
2266 else
2267 mddev->layout = n;
d4dbd025
N		 2268 return len;
2269}
2270static struct md_sysfs_entry md_layout =
80ca3a44 2271__ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
d4dbd025
N		 2272
2273
eae1701f 2274static ssize_t
96de1e66 2275raid_disks_show(mddev_t *mddev, char *page)
eae1701f 2276{
bb636547
N		 2277 if (mddev->raid_disks == 0)
2278 return 0;
08a02ecd
N		 2279 if (mddev->reshape_position != MaxSector &&
2280 mddev->delta_disks != 0)
2281 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2282 mddev->raid_disks - mddev->delta_disks);
eae1701f
N		 2283 return sprintf(page, "%d\n", mddev->raid_disks);
2284}
2285
da943b99
N		 2286static int update_raid_disks(mddev_t *mddev, int raid_disks);
2287
2288static ssize_t
2289raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2290{
da943b99
N		 2291 char *e;
2292 int rv = 0;
2293 unsigned long n = simple_strtoul(buf, &e, 10);
2294
2295 if (!*buf || (*e && *e != '\n'))
2296 return -EINVAL;
2297
2298 if (mddev->pers)
2299 rv = update_raid_disks(mddev, n);
08a02ecd
N		 2300 else if (mddev->reshape_position != MaxSector) {
2301 int olddisks = mddev->raid_disks - mddev->delta_disks;
2302 mddev->delta_disks = n - olddisks;
2303 mddev->raid_disks = n;
2304 } else
da943b99
N		 2305 mddev->raid_disks = n;
2306 return rv ? rv : len;
2307}
2308static struct md_sysfs_entry md_raid_disks =
80ca3a44 2309__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
eae1701f 2310
3b34380a
N		 2311static ssize_t
2312chunk_size_show(mddev_t *mddev, char *page)
2313{
08a02ecd
N		 2314 if (mddev->reshape_position != MaxSector &&
2315 mddev->chunk_size != mddev->new_chunk)
2316 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2317 mddev->chunk_size);
3b34380a
N		 2318 return sprintf(page, "%d\n", mddev->chunk_size);
2319}
2320
2321static ssize_t
2322chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2323{
2324 /* can only set chunk_size if array is not yet active */
2325 char *e;
2326 unsigned long n = simple_strtoul(buf, &e, 10);
2327
3b34380a
N		 2328 if (!*buf || (*e && *e != '\n'))
2329 return -EINVAL;
2330
08a02ecd
N		 2331 if (mddev->pers)
2332 return -EBUSY;
2333 else if (mddev->reshape_position != MaxSector)
2334 mddev->new_chunk = n;
2335 else
2336 mddev->chunk_size = n;
3b34380a
N		 2337 return len;
2338}
2339static struct md_sysfs_entry md_chunk_size =
80ca3a44 2340__ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3b34380a 2341
a94213b1
N		 2342static ssize_t
2343resync_start_show(mddev_t *mddev, char *page)
2344{
2345 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2346}
2347
2348static ssize_t
2349resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2350{
2351 /* can only set chunk_size if array is not yet active */
2352 char *e;
2353 unsigned long long n = simple_strtoull(buf, &e, 10);
2354
2355 if (mddev->pers)
2356 return -EBUSY;
2357 if (!*buf || (*e && *e != '\n'))
2358 return -EINVAL;
2359
2360 mddev->recovery_cp = n;
2361 return len;
2362}
2363static struct md_sysfs_entry md_resync_start =
80ca3a44 2364__ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
a94213b1 2365
9e653b63
N		 2366/*
2367 * The array state can be:
2368 *
2369 * clear
2370 * No devices, no size, no level
2371 * Equivalent to STOP_ARRAY ioctl
2372 * inactive
2373 * May have some settings, but array is not active
2374 * all IO results in error
2375 * When written, doesn't tear down array, but just stops it
2376 * suspended (not supported yet)
2377 * All IO requests will block. The array can be reconfigured.
2378 * Writing this, if accepted, will block until array is quiessent
2379 * readonly
2380 * no resync can happen. no superblocks get written.
2381 * write requests fail
2382 * read-auto
2383 * like readonly, but behaves like 'clean' on a write request.
2384 *
2385 * clean - no pending writes, but otherwise active.
2386 * When written to inactive array, starts without resync
2387 * If a write request arrives then
2388 * if metadata is known, mark 'dirty' and switch to 'active'.
2389 * if not known, block and switch to write-pending
2390 * If written to an active array that has pending writes, then fails.
2391 * active
2392 * fully active: IO and resync can be happening.
2393 * When written to inactive array, starts with resync
2394 *
2395 * write-pending
2396 * clean, but writes are blocked waiting for 'active' to be written.
2397 *
2398 * active-idle
2399 * like active, but no writes have been seen for a while (100msec).
2400 *
2401 */
2402enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2403 write_pending, active_idle, bad_word};
05381954 2404static char *array_states[] = {
9e653b63
N		 2405 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2406 "write-pending", "active-idle", NULL };
2407
2408static int match_word(const char *word, char **list)
2409{
2410 int n;
2411 for (n=0; list[n]; n++)
2412 if (cmd_match(word, list[n]))
2413 break;
2414 return n;
2415}
2416
2417static ssize_t
2418array_state_show(mddev_t *mddev, char *page)
2419{
2420 enum array_state st = inactive;
2421
2422 if (mddev->pers)
2423 switch(mddev->ro) {
2424 case 1:
2425 st = readonly;
2426 break;
2427 case 2:
2428 st = read_auto;
2429 break;
2430 case 0:
2431 if (mddev->in_sync)
2432 st = clean;
2433 else if (mddev->safemode)
2434 st = active_idle;
2435 else
2436 st = active;
2437 }
2438 else {
2439 if (list_empty(&mddev->disks) &&
2440 mddev->raid_disks == 0 &&
2441 mddev->size == 0)
2442 st = clear;
2443 else
2444 st = inactive;
2445 }
2446 return sprintf(page, "%s\n", array_states[st]);
2447}
2448
2449static int do_md_stop(mddev_t * mddev, int ro);
2450static int do_md_run(mddev_t * mddev);
2451static int restart_array(mddev_t *mddev);
2452
2453static ssize_t
2454array_state_store(mddev_t *mddev, const char *buf, size_t len)
2455{
2456 int err = -EINVAL;
2457 enum array_state st = match_word(buf, array_states);
2458 switch(st) {
2459 case bad_word:
2460 break;
2461 case clear:
2462 /* stopping an active array */
2463 if (mddev->pers) {
2464 if (atomic_read(&mddev->active) > 1)
2465 return -EBUSY;
2466 err = do_md_stop(mddev, 0);
2467 }
2468 break;
2469 case inactive:
2470 /* stopping an active array */
2471 if (mddev->pers) {
2472 if (atomic_read(&mddev->active) > 1)
2473 return -EBUSY;
2474 err = do_md_stop(mddev, 2);
2475 }
2476 break;
2477 case suspended:
2478 break; /* not supported yet */
2479 case readonly:
2480 if (mddev->pers)
2481 err = do_md_stop(mddev, 1);
2482 else {
2483 mddev->ro = 1;
2484 err = do_md_run(mddev);
2485 }
2486 break;
2487 case read_auto:
2488 /* stopping an active array */
2489 if (mddev->pers) {
2490 err = do_md_stop(mddev, 1);
2491 if (err == 0)
2492 mddev->ro = 2; /* FIXME mark devices writable */
2493 } else {
2494 mddev->ro = 2;
2495 err = do_md_run(mddev);
2496 }
2497 break;
2498 case clean:
2499 if (mddev->pers) {
2500 restart_array(mddev);
2501 spin_lock_irq(&mddev->write_lock);
2502 if (atomic_read(&mddev->writes_pending) == 0) {
2503 mddev->in_sync = 1;
850b2b42 2504 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
9e653b63
N		 2505 }
2506 spin_unlock_irq(&mddev->write_lock);
2507 } else {
2508 mddev->ro = 0;
2509 mddev->recovery_cp = MaxSector;
2510 err = do_md_run(mddev);
2511 }
2512 break;
2513 case active:
2514 if (mddev->pers) {
2515 restart_array(mddev);
850b2b42 2516 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
9e653b63
N		 2517 wake_up(&mddev->sb_wait);
2518 err = 0;
2519 } else {
2520 mddev->ro = 0;
2521 err = do_md_run(mddev);
2522 }
2523 break;
2524 case write_pending:
2525 case active_idle:
2526 /* these cannot be set */
2527 break;
2528 }
2529 if (err)
2530 return err;
2531 else
2532 return len;
2533}
80ca3a44
N		 2534static struct md_sysfs_entry md_array_state =
2535__ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
9e653b63 2536
6d7ff738
N		 2537static ssize_t
2538null_show(mddev_t *mddev, char *page)
2539{
2540 return -EINVAL;
2541}
2542
2543static ssize_t
2544new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2545{
2546 /* buf must be %d:%d\n? giving major and minor numbers */
2547 /* The new device is added to the array.
2548 * If the array has a persistent superblock, we read the
2549 * superblock to initialise info and check validity.
2550 * Otherwise, only checking done is that in bind_rdev_to_array,
2551 * which mainly checks size.
2552 */
2553 char *e;
2554 int major = simple_strtoul(buf, &e, 10);
2555 int minor;
2556 dev_t dev;
2557 mdk_rdev_t *rdev;
2558 int err;
2559
2560 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2561 return -EINVAL;
2562 minor = simple_strtoul(e+1, &e, 10);
2563 if (*e && *e != '\n')
2564 return -EINVAL;
2565 dev = MKDEV(major, minor);
2566 if (major != MAJOR(dev) ||
2567 minor != MINOR(dev))
2568 return -EOVERFLOW;
2569
2570
2571 if (mddev->persistent) {
2572 rdev = md_import_device(dev, mddev->major_version,
2573 mddev->minor_version);
2574 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2575 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2576 mdk_rdev_t, same_set);
2577 err = super_types[mddev->major_version]
2578 .load_super(rdev, rdev0, mddev->minor_version);
2579 if (err < 0)
2580 goto out;
2581 }
2582 } else
2583 rdev = md_import_device(dev, -1, -1);
2584
2585 if (IS_ERR(rdev))
2586 return PTR_ERR(rdev);
2587 err = bind_rdev_to_array(rdev, mddev);
2588 out:
2589 if (err)
2590 export_rdev(rdev);
2591 return err ? err : len;
2592}
2593
2594static struct md_sysfs_entry md_new_device =
80ca3a44 2595__ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3b34380a 2596
9b1d1dac
PC		 2597static ssize_t
2598bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2599{
2600 char *end;
2601 unsigned long chunk, end_chunk;
2602
2603 if (!mddev->bitmap)
2604 goto out;
2605 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2606 while (*buf) {
2607 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2608 if (buf == end) break;
2609 if (*end == '-') { /* range */
2610 buf = end + 1;
2611 end_chunk = simple_strtoul(buf, &end, 0);
2612 if (buf == end) break;
2613 }
2614 if (*end && !isspace(*end)) break;
2615 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2616 buf = end;
2617 while (isspace(*buf)) buf++;
2618 }
2619 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2620out:
2621 return len;
2622}
2623
2624static struct md_sysfs_entry md_bitmap =
2625__ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2626
a35b0d69
N		 2627static ssize_t
2628size_show(mddev_t *mddev, char *page)
2629{
2630 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2631}
2632
2633static int update_size(mddev_t *mddev, unsigned long size);
2634
2635static ssize_t
2636size_store(mddev_t *mddev, const char *buf, size_t len)
2637{
2638 /* If array is inactive, we can reduce the component size, but
2639 * not increase it (except from 0).
2640 * If array is active, we can try an on-line resize
2641 */
2642 char *e;
2643 int err = 0;
2644 unsigned long long size = simple_strtoull(buf, &e, 10);
2645 if (!*buf || *buf == '\n' ||
2646 (*e && *e != '\n'))
2647 return -EINVAL;
2648
2649 if (mddev->pers) {
2650 err = update_size(mddev, size);
850b2b42 2651 md_update_sb(mddev, 1);
a35b0d69
N		 2652 } else {
2653 if (mddev->size == 0 ||
2654 mddev->size > size)
2655 mddev->size = size;
2656 else
2657 err = -ENOSPC;
2658 }
2659 return err ? err : len;
2660}
2661
2662static struct md_sysfs_entry md_size =
80ca3a44 2663__ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
a35b0d69 2664
8bb93aac
N		 2665
2666/* Metdata version.
2667 * This is either 'none' for arrays with externally managed metadata,
2668 * or N.M for internally known formats
2669 */
2670static ssize_t
2671metadata_show(mddev_t *mddev, char *page)
2672{
2673 if (mddev->persistent)
2674 return sprintf(page, "%d.%d\n",
2675 mddev->major_version, mddev->minor_version);
2676 else
2677 return sprintf(page, "none\n");
2678}
2679
2680static ssize_t
2681metadata_store(mddev_t *mddev, const char *buf, size_t len)
2682{
2683 int major, minor;
2684 char *e;
2685 if (!list_empty(&mddev->disks))
2686 return -EBUSY;
2687
2688 if (cmd_match(buf, "none")) {
2689 mddev->persistent = 0;
2690 mddev->major_version = 0;
2691 mddev->minor_version = 90;
2692 return len;
2693 }
2694 major = simple_strtoul(buf, &e, 10);
2695 if (e==buf || *e != '.')
2696 return -EINVAL;
2697 buf = e+1;
2698 minor = simple_strtoul(buf, &e, 10);
3f9d7b0d 2699 if (e==buf || (*e && *e != '\n') )
8bb93aac 2700 return -EINVAL;
50511da3 2701 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
8bb93aac
N		 2702 return -ENOENT;
2703 mddev->major_version = major;
2704 mddev->minor_version = minor;
2705 mddev->persistent = 1;
2706 return len;
2707}
2708
2709static struct md_sysfs_entry md_metadata =
80ca3a44 2710__ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
8bb93aac 2711
24dd469d 2712static ssize_t
7eec314d 2713action_show(mddev_t *mddev, char *page)
24dd469d 2714{
7eec314d 2715 char *type = "idle";
31399d9e 2716 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2b12ab6d 2717 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
ccfcc3c1
N		 2718 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2719 type = "reshape";
2720 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N		 2721 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2722 type = "resync";
2723 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2724 type = "check";
2725 else
2726 type = "repair";
2727 } else
2728 type = "recover";
2729 }
2730 return sprintf(page, "%s\n", type);
2731}
2732
2733static ssize_t
7eec314d 2734action_store(mddev_t *mddev, const char *page, size_t len)
24dd469d 2735{
7eec314d
N		 2736 if (!mddev->pers || !mddev->pers->sync_request)
2737 return -EINVAL;
2738
bce74dac 2739 if (cmd_match(page, "idle")) {
7eec314d
N		 2740 if (mddev->sync_thread) {
2741 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2742 md_unregister_thread(mddev->sync_thread);
2743 mddev->sync_thread = NULL;
2744 mddev->recovery = 0;
2745 }
03c902e1
N		 2746 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2747 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 2748 return -EBUSY;
03c902e1 2749 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
7eec314d 2750 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
16484bf5
N		 2751 else if (cmd_match(page, "reshape")) {
2752 int err;
2753 if (mddev->pers->start_reshape == NULL)
2754 return -EINVAL;
2755 err = mddev->pers->start_reshape(mddev);
2756 if (err)
2757 return err;
2758 } else {
bce74dac 2759 if (cmd_match(page, "check"))
7eec314d 2760 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2adc7d47 2761 else if (!cmd_match(page, "repair"))
7eec314d
N		 2762 return -EINVAL;
2763 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2764 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7eec314d 2765 }
03c902e1 2766 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d
N		 2767 md_wakeup_thread(mddev->thread);
2768 return len;
2769}
2770
9d88883e 2771static ssize_t
96de1e66 2772mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 2773{
2774 return sprintf(page, "%llu\n",
2775 (unsigned long long) mddev->resync_mismatches);
2776}
2777
80ca3a44
N		 2778static struct md_sysfs_entry md_scan_mode =
2779__ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 2780
96de1e66 2781
80ca3a44 2782static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 2783
88202a0c
N		 2784static ssize_t
2785sync_min_show(mddev_t *mddev, char *page)
2786{
2787 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2788 mddev->sync_speed_min ? "local": "system");
2789}
2790
2791static ssize_t
2792sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2793{
2794 int min;
2795 char *e;
2796 if (strncmp(buf, "system", 6)==0) {
2797 mddev->sync_speed_min = 0;
2798 return len;
2799 }
2800 min = simple_strtoul(buf, &e, 10);
2801 if (buf == e || (*e && *e != '\n') || min <= 0)
2802 return -EINVAL;
2803 mddev->sync_speed_min = min;
2804 return len;
2805}
2806
2807static struct md_sysfs_entry md_sync_min =
2808__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2809
2810static ssize_t
2811sync_max_show(mddev_t *mddev, char *page)
2812{
2813 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2814 mddev->sync_speed_max ? "local": "system");
2815}
2816
2817static ssize_t
2818sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2819{
2820 int max;
2821 char *e;
2822 if (strncmp(buf, "system", 6)==0) {
2823 mddev->sync_speed_max = 0;
2824 return len;
2825 }
2826 max = simple_strtoul(buf, &e, 10);
2827 if (buf == e || (*e && *e != '\n') || max <= 0)
2828 return -EINVAL;
2829 mddev->sync_speed_max = max;
2830 return len;
2831}
2832
2833static struct md_sysfs_entry md_sync_max =
2834__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2835
2836
2837static ssize_t
2838sync_speed_show(mddev_t *mddev, char *page)
2839{
2840 unsigned long resync, dt, db;
ff4e8d9a 2841 resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active));
88202a0c
N		 2842 dt = ((jiffies - mddev->resync_mark) / HZ);
2843 if (!dt) dt++;
2844 db = resync - (mddev->resync_mark_cnt);
2845 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2846}
2847
80ca3a44 2848static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
88202a0c
N		 2849
2850static ssize_t
2851sync_completed_show(mddev_t *mddev, char *page)
2852{
2853 unsigned long max_blocks, resync;
2854
2855 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2856 max_blocks = mddev->resync_max_sectors;
2857 else
2858 max_blocks = mddev->size << 1;
2859
2860 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2861 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2862}
2863
80ca3a44 2864static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
88202a0c 2865
e464eafd
N		 2866static ssize_t
2867suspend_lo_show(mddev_t *mddev, char *page)
2868{
2869 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
2870}
2871
2872static ssize_t
2873suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
2874{
2875 char *e;
2876 unsigned long long new = simple_strtoull(buf, &e, 10);
2877
2878 if (mddev->pers->quiesce == NULL)
2879 return -EINVAL;
2880 if (buf == e || (*e && *e != '\n'))
2881 return -EINVAL;
2882 if (new >= mddev->suspend_hi ||
2883 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
2884 mddev->suspend_lo = new;
2885 mddev->pers->quiesce(mddev, 2);
2886 return len;
2887 } else
2888 return -EINVAL;
2889}
2890static struct md_sysfs_entry md_suspend_lo =
2891__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
2892
2893
2894static ssize_t
2895suspend_hi_show(mddev_t *mddev, char *page)
2896{
2897 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
2898}
2899
2900static ssize_t
2901suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
2902{
2903 char *e;
2904 unsigned long long new = simple_strtoull(buf, &e, 10);
2905
2906 if (mddev->pers->quiesce == NULL)
2907 return -EINVAL;
2908 if (buf == e || (*e && *e != '\n'))
2909 return -EINVAL;
2910 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
2911 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
2912 mddev->suspend_hi = new;
2913 mddev->pers->quiesce(mddev, 1);
2914 mddev->pers->quiesce(mddev, 0);
2915 return len;
2916 } else
2917 return -EINVAL;
2918}
2919static struct md_sysfs_entry md_suspend_hi =
2920__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
2921
08a02ecd
N		 2922static ssize_t
2923reshape_position_show(mddev_t *mddev, char *page)
2924{
2925 if (mddev->reshape_position != MaxSector)
2926 return sprintf(page, "%llu\n",
2927 (unsigned long long)mddev->reshape_position);
2928 strcpy(page, "none\n");
2929 return 5;
2930}
2931
2932static ssize_t
2933reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
2934{
2935 char *e;
2936 unsigned long long new = simple_strtoull(buf, &e, 10);
2937 if (mddev->pers)
2938 return -EBUSY;
2939 if (buf == e || (*e && *e != '\n'))
2940 return -EINVAL;
2941 mddev->reshape_position = new;
2942 mddev->delta_disks = 0;
2943 mddev->new_level = mddev->level;
2944 mddev->new_layout = mddev->layout;
2945 mddev->new_chunk = mddev->chunk_size;
2946 return len;
2947}
2948
2949static struct md_sysfs_entry md_reshape_position =
2950__ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
2951 reshape_position_store);
2952
e464eafd 2953
eae1701f
N		 2954static struct attribute *md_default_attrs[] = {
2955 &md_level.attr,
d4dbd025 2956 &md_layout.attr,
eae1701f 2957 &md_raid_disks.attr,
3b34380a 2958 &md_chunk_size.attr,
a35b0d69 2959 &md_size.attr,
a94213b1 2960 &md_resync_start.attr,
8bb93aac 2961 &md_metadata.attr,
6d7ff738 2962 &md_new_device.attr,
16f17b39 2963 &md_safe_delay.attr,
9e653b63 2964 &md_array_state.attr,
08a02ecd 2965 &md_reshape_position.attr,
411036fa
N		 2966 NULL,
2967};
2968
2969static struct attribute *md_redundancy_attrs[] = {
24dd469d 2970 &md_scan_mode.attr,
9d88883e 2971 &md_mismatches.attr,
88202a0c
N		 2972 &md_sync_min.attr,
2973 &md_sync_max.attr,
2974 &md_sync_speed.attr,
2975 &md_sync_completed.attr,
e464eafd
N		 2976 &md_suspend_lo.attr,
2977 &md_suspend_hi.attr,
9b1d1dac 2978 &md_bitmap.attr,
eae1701f
N		 2979 NULL,
2980};
411036fa
N		 2981static struct attribute_group md_redundancy_group = {
2982 .name = NULL,
2983 .attrs = md_redundancy_attrs,
2984};
2985
eae1701f
N		 2986
2987static ssize_t
2988md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2989{
2990 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2991 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2992 ssize_t rv;
eae1701f
N		 2993
2994 if (!entry->show)
2995 return -EIO;
5dc5cf7d
IM		 2996 rv = mddev_lock(mddev);
2997 if (!rv) {
2998 rv = entry->show(mddev, page);
2999 mddev_unlock(mddev);
3000 }
96de1e66 3001 return rv;
eae1701f
N		 3002}
3003
3004static ssize_t
3005md_attr_store(struct kobject *kobj, struct attribute *attr,
3006 const char *page, size_t length)
3007{
3008 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3009 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 3010 ssize_t rv;
eae1701f
N		 3011
3012 if (!entry->store)
3013 return -EIO;
67463acb
N		 3014 if (!capable(CAP_SYS_ADMIN))
3015 return -EACCES;
5dc5cf7d
IM		 3016 rv = mddev_lock(mddev);
3017 if (!rv) {
3018 rv = entry->store(mddev, page, length);
3019 mddev_unlock(mddev);
3020 }
96de1e66 3021 return rv;
eae1701f
N		 3022}
3023
3024static void md_free(struct kobject *ko)
3025{
3026 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3027 kfree(mddev);
3028}
3029
3030static struct sysfs_ops md_sysfs_ops = {
3031 .show = md_attr_show,
3032 .store = md_attr_store,
3033};
3034static struct kobj_type md_ktype = {
3035 .release = md_free,
3036 .sysfs_ops = &md_sysfs_ops,
3037 .default_attrs = md_default_attrs,
3038};
3039
1da177e4
LT		 3040int mdp_major = 0;
3041
3042static struct kobject *md_probe(dev_t dev, int *part, void *data)
3043{
48c9c27b 3044 static DEFINE_MUTEX(disks_mutex);
1da177e4
LT		 3045 mddev_t *mddev = mddev_find(dev);
3046 struct gendisk *disk;
3047 int partitioned = (MAJOR(dev) != MD_MAJOR);
3048 int shift = partitioned ? MdpMinorShift : 0;
3049 int unit = MINOR(dev) >> shift;
3050
3051 if (!mddev)
3052 return NULL;
3053
48c9c27b 3054 mutex_lock(&disks_mutex);
1da177e4 3055 if (mddev->gendisk) {
48c9c27b 3056 mutex_unlock(&disks_mutex);
1da177e4
LT		 3057 mddev_put(mddev);
3058 return NULL;
3059 }
3060 disk = alloc_disk(1 << shift);
3061 if (!disk) {
48c9c27b 3062 mutex_unlock(&disks_mutex);
1da177e4
LT		 3063 mddev_put(mddev);
3064 return NULL;
3065 }
3066 disk->major = MAJOR(dev);
3067 disk->first_minor = unit << shift;
ce7b0f46 3068 if (partitioned)
1da177e4 3069 sprintf(disk->disk_name, "md_d%d", unit);
ce7b0f46 3070 else
1da177e4 3071 sprintf(disk->disk_name, "md%d", unit);
1da177e4
LT		 3072 disk->fops = &md_fops;
3073 disk->private_data = mddev;
3074 disk->queue = mddev->queue;
3075 add_disk(disk);
3076 mddev->gendisk = disk;
48c9c27b 3077 mutex_unlock(&disks_mutex);
9c791977 3078 mddev->kobj.parent = &disk->kobj;
19c38de8 3079 kobject_set_name(&mddev->kobj, "%s", "md");
eae1701f 3080 mddev->kobj.ktype = &md_ktype;
5e55e2f5
N		 3081 if (kobject_register(&mddev->kobj))
3082 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3083 disk->disk_name);
1da177e4
LT		 3084 return NULL;
3085}
3086
1da177e4
LT		 3087static void md_safemode_timeout(unsigned long data)
3088{
3089 mddev_t *mddev = (mddev_t *) data;
3090
3091 mddev->safemode = 1;
3092 md_wakeup_thread(mddev->thread);
3093}
3094
6ff8d8ec 3095static int start_dirty_degraded;
1da177e4
LT		 3096
3097static int do_md_run(mddev_t * mddev)
3098{
2604b703 3099 int err;
1da177e4
LT		 3100 int chunk_size;
3101 struct list_head *tmp;
3102 mdk_rdev_t *rdev;
3103 struct gendisk *disk;
2604b703 3104 struct mdk_personality *pers;
1da177e4
LT		 3105 char b[BDEVNAME_SIZE];
3106
a757e64c
N		 3107 if (list_empty(&mddev->disks))
3108 /* cannot run an array with no devices.. */
1da177e4 3109 return -EINVAL;
1da177e4
LT		 3110
3111 if (mddev->pers)
3112 return -EBUSY;
3113
3114 /*
3115 * Analyze all RAID superblock(s)
3116 */
a757e64c
N		 3117 if (!mddev->raid_disks)
3118 analyze_sbs(mddev);
1da177e4
LT		 3119
3120 chunk_size = mddev->chunk_size;
2604b703
N		 3121
3122 if (chunk_size) {
1da177e4
LT		 3123 if (chunk_size > MAX_CHUNK_SIZE) {
3124 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3125 chunk_size, MAX_CHUNK_SIZE);
3126 return -EINVAL;
3127 }
3128 /*
3129 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3130 */
3131 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 3132 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 3133 return -EINVAL;
3134 }
3135 if (chunk_size < PAGE_SIZE) {
3136 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
3137 chunk_size, PAGE_SIZE);
3138 return -EINVAL;
3139 }
3140
3141 /* devices must have minimum size of one chunk */
3142 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 3143 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3144 continue;
3145 if (rdev->size < chunk_size / 1024) {
3146 printk(KERN_WARNING
3147 "md: Dev %s smaller than chunk_size:"
3148 " %lluk < %dk\n",
3149 bdevname(rdev->bdev,b),
3150 (unsigned long long)rdev->size,
3151 chunk_size / 1024);
3152 return -EINVAL;
3153 }
3154 }
3155 }
3156
1da177e4 3157#ifdef CONFIG_KMOD
d9d166c2
N		 3158 if (mddev->level != LEVEL_NONE)
3159 request_module("md-level-%d", mddev->level);
3160 else if (mddev->clevel[0])
3161 request_module("md-%s", mddev->clevel);
1da177e4
LT		 3162#endif
3163
3164 /*
3165 * Drop all container device buffers, from now on
3166 * the only valid external interface is through the md
3167 * device.
1da177e4
LT		 3168 */
3169 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 3170 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3171 continue;
3172 sync_blockdev(rdev->bdev);
f98393a6 3173 invalidate_bdev(rdev->bdev);
f0d76d70
N		 3174
3175 /* perform some consistency tests on the device.
3176 * We don't want the data to overlap the metadata,
3177 * Internal Bitmap issues has handled elsewhere.
3178 */
3179 if (rdev->data_offset < rdev->sb_offset) {
3180 if (mddev->size &&
3181 rdev->data_offset + mddev->size*2
3182 > rdev->sb_offset*2) {
3183 printk("md: %s: data overlaps metadata\n",
3184 mdname(mddev));
3185 return -EINVAL;
3186 }
3187 } else {
3188 if (rdev->sb_offset*2 + rdev->sb_size/512
3189 > rdev->data_offset) {
3190 printk("md: %s: metadata overlaps data\n",
3191 mdname(mddev));
3192 return -EINVAL;
3193 }
3194 }
1da177e4
LT		 3195 }
3196
3197 md_probe(mddev->unit, NULL, NULL);
3198 disk = mddev->gendisk;
3199 if (!disk)
3200 return -ENOMEM;
3201
3202 spin_lock(&pers_lock);
d9d166c2 3203 pers = find_pers(mddev->level, mddev->clevel);
2604b703 3204 if (!pers || !try_module_get(pers->owner)) {
1da177e4 3205 spin_unlock(&pers_lock);
d9d166c2
N		 3206 if (mddev->level != LEVEL_NONE)
3207 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3208 mddev->level);
3209 else
3210 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3211 mddev->clevel);
1da177e4
LT		 3212 return -EINVAL;
3213 }
2604b703 3214 mddev->pers = pers;
1da177e4 3215 spin_unlock(&pers_lock);
d9d166c2
N		 3216 mddev->level = pers->level;
3217 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
1da177e4 3218
f6705578 3219 if (mddev->reshape_position != MaxSector &&
63c70c4f 3220 pers->start_reshape == NULL) {
f6705578
N		 3221 /* This personality cannot handle reshaping... */
3222 mddev->pers = NULL;
3223 module_put(pers->owner);
3224 return -EINVAL;
3225 }
3226
7dd5e7c3
N		 3227 if (pers->sync_request) {
3228 /* Warn if this is a potentially silly
3229 * configuration.
3230 */
3231 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3232 mdk_rdev_t *rdev2;
3233 struct list_head *tmp2;
3234 int warned = 0;
3235 ITERATE_RDEV(mddev, rdev, tmp) {
3236 ITERATE_RDEV(mddev, rdev2, tmp2) {
3237 if (rdev < rdev2 &&
3238 rdev->bdev->bd_contains ==
3239 rdev2->bdev->bd_contains) {
3240 printk(KERN_WARNING
3241 "%s: WARNING: %s appears to be"
3242 " on the same physical disk as"
3243 " %s.\n",
3244 mdname(mddev),
3245 bdevname(rdev->bdev,b),
3246 bdevname(rdev2->bdev,b2));
3247 warned = 1;
3248 }
3249 }
3250 }
3251 if (warned)
3252 printk(KERN_WARNING
3253 "True protection against single-disk"
3254 " failure might be compromised.\n");
3255 }
3256
657390d2 3257 mddev->recovery = 0;
1da177e4 3258 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 3259 mddev->barriers_work = 1;
6ff8d8ec 3260 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 3261
f91de92e
N		 3262 if (start_readonly)
3263 mddev->ro = 2; /* read-only, but switch on first write */
3264
b15c2e57
N		 3265 err = mddev->pers->run(mddev);
3266 if (!err && mddev->pers->sync_request) {
3267 err = bitmap_create(mddev);
3268 if (err) {
3269 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3270 mdname(mddev), err);
3271 mddev->pers->stop(mddev);
3272 }
3273 }
1da177e4
LT		 3274 if (err) {
3275 printk(KERN_ERR "md: pers->run() failed ...\n");
3276 module_put(mddev->pers->owner);
3277 mddev->pers = NULL;
32a7627c
N		 3278 bitmap_destroy(mddev);
3279 return err;
1da177e4 3280 }
5e55e2f5
N		 3281 if (mddev->pers->sync_request) {
3282 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3283 printk(KERN_WARNING
3284 "md: cannot register extra attributes for %s\n",
3285 mdname(mddev));
3286 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
fd9d49ca
N		 3287 mddev->ro = 0;
3288
1da177e4
LT		 3289 atomic_set(&mddev->writes_pending,0);
3290 mddev->safemode = 0;
3291 mddev->safemode_timer.function = md_safemode_timeout;
3292 mddev->safemode_timer.data = (unsigned long) mddev;
16f17b39 3293 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
1da177e4 3294 mddev->in_sync = 1;
86e6ffdd
N		 3295
3296 ITERATE_RDEV(mddev,rdev,tmp)
3297 if (rdev->raid_disk >= 0) {
3298 char nm[20];
3299 sprintf(nm, "rd%d", rdev->raid_disk);
5e55e2f5
N		 3300 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3301 printk("md: cannot register %s for %s\n",
3302 nm, mdname(mddev));
86e6ffdd 3303 }
1da177e4
LT		 3304
3305 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3306
850b2b42
N		 3307 if (mddev->flags)
3308 md_update_sb(mddev, 0);
1da177e4
LT		 3309
3310 set_capacity(disk, mddev->array_size<<1);
3311
3312 /* If we call blk_queue_make_request here, it will
3313 * re-initialise max_sectors etc which may have been
3314 * refined inside -> run. So just set the bits we need to set.
3315 * Most initialisation happended when we called
3316 * blk_queue_make_request(..., md_fail_request)
3317 * earlier.
3318 */
3319 mddev->queue->queuedata = mddev;
3320 mddev->queue->make_request_fn = mddev->pers->make_request;
3321
5fd6c1dc
N		 3322 /* If there is a partially-recovered drive we need to
3323 * start recovery here. If we leave it to md_check_recovery,
3324 * it will remove the drives and not do the right thing
3325 */
0b8c9de0 3326 if (mddev->degraded && !mddev->sync_thread) {
5fd6c1dc
N		 3327 struct list_head *rtmp;
3328 int spares = 0;
3329 ITERATE_RDEV(mddev,rdev,rtmp)
3330 if (rdev->raid_disk >= 0 &&
3331 !test_bit(In_sync, &rdev->flags) &&
3332 !test_bit(Faulty, &rdev->flags))
3333 /* complete an interrupted recovery */
3334 spares++;
3335 if (spares && mddev->pers->sync_request) {
3336 mddev->recovery = 0;
3337 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3338 mddev->sync_thread = md_register_thread(md_do_sync,
3339 mddev,
3340 "%s_resync");
3341 if (!mddev->sync_thread) {
3342 printk(KERN_ERR "%s: could not start resync"
3343 " thread...\n",
3344 mdname(mddev));
3345 /* leave the spares where they are, it shouldn't hurt */
3346 mddev->recovery = 0;
0b8c9de0 3347 }
5fd6c1dc
N		 3348 }
3349 }
0b8c9de0
N		 3350 md_wakeup_thread(mddev->thread);
3351 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5fd6c1dc 3352
44ce6294 3353 mddev->changed = 1;
d7603b7e 3354 md_new_event(mddev);
2f471303 3355 kobject_uevent(&mddev->gendisk->kobj, KOBJ_CHANGE);
1da177e4
LT		 3356 return 0;
3357}
3358
3359static int restart_array(mddev_t *mddev)
3360{
3361 struct gendisk *disk = mddev->gendisk;
3362 int err;
3363
3364 /*
3365 * Complain if it has no devices
3366 */
3367 err = -ENXIO;
3368 if (list_empty(&mddev->disks))
3369 goto out;
3370
3371 if (mddev->pers) {
3372 err = -EBUSY;
3373 if (!mddev->ro)
3374 goto out;
3375
3376 mddev->safemode = 0;
3377 mddev->ro = 0;
3378 set_disk_ro(disk, 0);
3379
3380 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3381 mdname(mddev));
3382 /*
3383 * Kick recovery or resync if necessary
3384 */
3385 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3386 md_wakeup_thread(mddev->thread);
5fd6c1dc 3387 md_wakeup_thread(mddev->sync_thread);
1da177e4 3388 err = 0;
9e653b63 3389 } else
1da177e4 3390 err = -EINVAL;
1da177e4
LT		 3391
3392out:
3393 return err;
3394}
3395
acc55e22
N		 3396/* similar to deny_write_access, but accounts for our holding a reference
3397 * to the file ourselves */
3398static int deny_bitmap_write_access(struct file * file)
3399{
3400 struct inode *inode = file->f_mapping->host;
3401
3402 spin_lock(&inode->i_lock);
3403 if (atomic_read(&inode->i_writecount) > 1) {
3404 spin_unlock(&inode->i_lock);
3405 return -ETXTBSY;
3406 }
3407 atomic_set(&inode->i_writecount, -1);
3408 spin_unlock(&inode->i_lock);
3409
3410 return 0;
3411}
3412
3413static void restore_bitmap_write_access(struct file *file)
3414{
3415 struct inode *inode = file->f_mapping->host;
3416
3417 spin_lock(&inode->i_lock);
3418 atomic_set(&inode->i_writecount, 1);
3419 spin_unlock(&inode->i_lock);
3420}
3421
9e653b63
N		 3422/* mode:
3423 * 0 - completely stop and dis-assemble array
3424 * 1 - switch to readonly
3425 * 2 - stop but do not disassemble array
3426 */
3427static int do_md_stop(mddev_t * mddev, int mode)
1da177e4
LT		 3428{
3429 int err = 0;
3430 struct gendisk *disk = mddev->gendisk;
3431
3432 if (mddev->pers) {
3433 if (atomic_read(&mddev->active)>2) {
3434 printk("md: %s still in use.\n",mdname(mddev));
3435 return -EBUSY;
3436 }
3437
3438 if (mddev->sync_thread) {
5fd6c1dc 3439 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4
LT		 3440 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3441 md_unregister_thread(mddev->sync_thread);
3442 mddev->sync_thread = NULL;
3443 }
3444
3445 del_timer_sync(&mddev->safemode_timer);
3446
3447 invalidate_partition(disk, 0);
3448
9e653b63
N		 3449 switch(mode) {
3450 case 1: /* readonly */
1da177e4 3451 err = -ENXIO;
f91de92e 3452 if (mddev->ro==1)
1da177e4
LT		 3453 goto out;
3454 mddev->ro = 1;
9e653b63
N		 3455 break;
3456 case 0: /* disassemble */
3457 case 2: /* stop */
6b8b3e8a 3458 bitmap_flush(mddev);
a9701a30 3459 md_super_wait(mddev);
1da177e4
LT		 3460 if (mddev->ro)
3461 set_disk_ro(disk, 0);
3462 blk_queue_make_request(mddev->queue, md_fail_request);
3463 mddev->pers->stop(mddev);
d1b5380c
N		 3464 mddev->queue->merge_bvec_fn = NULL;
3465 mddev->queue->unplug_fn = NULL;
041ae52e 3466 mddev->queue->backing_dev_info.congested_fn = NULL;
411036fa
N		 3467 if (mddev->pers->sync_request)
3468 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3469
1da177e4
LT		 3470 module_put(mddev->pers->owner);
3471 mddev->pers = NULL;
0d4ca600
N		 3472
3473 set_capacity(disk, 0);
44ce6294 3474 mddev->changed = 1;
0d4ca600 3475
1da177e4
LT		 3476 if (mddev->ro)
3477 mddev->ro = 0;
3478 }
850b2b42 3479 if (!mddev->in_sync || mddev->flags) {
1da177e4
LT		 3480 /* mark array as shutdown cleanly */
3481 mddev->in_sync = 1;
850b2b42 3482 md_update_sb(mddev, 1);
1da177e4 3483 }
9e653b63 3484 if (mode == 1)
1da177e4 3485 set_disk_ro(disk, 1);
5fd6c1dc 3486 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4 3487 }
32a7627c 3488
1da177e4
LT		 3489 /*
3490 * Free resources if final stop
3491 */
9e653b63 3492 if (mode == 0) {
86e6ffdd
N		 3493 mdk_rdev_t *rdev;
3494 struct list_head *tmp;
0d4ca600 3495
1da177e4
LT		 3496 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3497
978f946b
N		 3498 bitmap_destroy(mddev);
3499 if (mddev->bitmap_file) {
acc55e22 3500 restore_bitmap_write_access(mddev->bitmap_file);
978f946b
N		 3501 fput(mddev->bitmap_file);
3502 mddev->bitmap_file = NULL;
3503 }
3504 mddev->bitmap_offset = 0;
3505
86e6ffdd
N		 3506 ITERATE_RDEV(mddev,rdev,tmp)
3507 if (rdev->raid_disk >= 0) {
3508 char nm[20];
3509 sprintf(nm, "rd%d", rdev->raid_disk);
3510 sysfs_remove_link(&mddev->kobj, nm);
3511 }
3512
5792a285
N		 3513 /* make sure all delayed_delete calls have finished */
3514 flush_scheduled_work();
3515
1da177e4
LT		 3516 export_array(mddev);
3517
3518 mddev->array_size = 0;
9e653b63
N		 3519 mddev->size = 0;
3520 mddev->raid_disks = 0;
a94213b1 3521 mddev->recovery_cp = 0;
08a02ecd 3522 mddev->reshape_position = MaxSector;
9e653b63 3523
a8a55c38 3524 } else if (mddev->pers)
1da177e4
LT		 3525 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3526 mdname(mddev));
3527 err = 0;
d7603b7e 3528 md_new_event(mddev);
1da177e4
LT		 3529out:
3530 return err;
3531}
3532
fdee8ae4 3533#ifndef MODULE
1da177e4
LT		 3534static void autorun_array(mddev_t *mddev)
3535{
3536 mdk_rdev_t *rdev;
3537 struct list_head *tmp;
3538 int err;
3539
a757e64c 3540 if (list_empty(&mddev->disks))
1da177e4 3541 return;
1da177e4
LT		 3542
3543 printk(KERN_INFO "md: running: ");
3544
3545 ITERATE_RDEV(mddev,rdev,tmp) {
3546 char b[BDEVNAME_SIZE];
3547 printk("<%s>", bdevname(rdev->bdev,b));
3548 }
3549 printk("\n");
3550
3551 err = do_md_run (mddev);
3552 if (err) {
3553 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3554 do_md_stop (mddev, 0);
3555 }
3556}
3557
3558/*
3559 * lets try to run arrays based on all disks that have arrived
3560 * until now. (those are in pending_raid_disks)
3561 *
3562 * the method: pick the first pending disk, collect all disks with
3563 * the same UUID, remove all from the pending list and put them into
3564 * the 'same_array' list. Then order this list based on superblock
3565 * update time (freshest comes first), kick out 'old' disks and
3566 * compare superblocks. If everything's fine then run it.
3567 *
3568 * If "unit" is allocated, then bump its reference count
3569 */
3570static void autorun_devices(int part)
3571{
1da177e4
LT		 3572 struct list_head *tmp;
3573 mdk_rdev_t *rdev0, *rdev;
3574 mddev_t *mddev;
3575 char b[BDEVNAME_SIZE];
3576
3577 printk(KERN_INFO "md: autorun ...\n");
3578 while (!list_empty(&pending_raid_disks)) {
e8703fe1 3579 int unit;
1da177e4 3580 dev_t dev;
ad01c9e3 3581 LIST_HEAD(candidates);
1da177e4
LT		 3582 rdev0 = list_entry(pending_raid_disks.next,
3583 mdk_rdev_t, same_set);
3584
3585 printk(KERN_INFO "md: considering %s ...\n",
3586 bdevname(rdev0->bdev,b));
3587 INIT_LIST_HEAD(&candidates);
3588 ITERATE_RDEV_PENDING(rdev,tmp)
3589 if (super_90_load(rdev, rdev0, 0) >= 0) {
3590 printk(KERN_INFO "md: adding %s ...\n",
3591 bdevname(rdev->bdev,b));
3592 list_move(&rdev->same_set, &candidates);
3593 }
3594 /*
3595 * now we have a set of devices, with all of them having
3596 * mostly sane superblocks. It's time to allocate the
3597 * mddev.
3598 */
e8703fe1
N		 3599 if (part) {
3600 dev = MKDEV(mdp_major,
3601 rdev0->preferred_minor << MdpMinorShift);
3602 unit = MINOR(dev) >> MdpMinorShift;
3603 } else {
3604 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3605 unit = MINOR(dev);
3606 }
3607 if (rdev0->preferred_minor != unit) {
1da177e4
LT		 3608 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3609 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3610 break;
3611 }
1da177e4
LT		 3612
3613 md_probe(dev, NULL, NULL);
3614 mddev = mddev_find(dev);
3615 if (!mddev) {
3616 printk(KERN_ERR
3617 "md: cannot allocate memory for md drive.\n");
3618 break;
3619 }
3620 if (mddev_lock(mddev))
3621 printk(KERN_WARNING "md: %s locked, cannot run\n",
3622 mdname(mddev));
3623 else if (mddev->raid_disks || mddev->major_version
3624 || !list_empty(&mddev->disks)) {
3625 printk(KERN_WARNING
3626 "md: %s already running, cannot run %s\n",
3627 mdname(mddev), bdevname(rdev0->bdev,b));
3628 mddev_unlock(mddev);
3629 } else {
3630 printk(KERN_INFO "md: created %s\n", mdname(mddev));
3631 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
3632 list_del_init(&rdev->same_set);
3633 if (bind_rdev_to_array(rdev, mddev))
3634 export_rdev(rdev);
3635 }
3636 autorun_array(mddev);
3637 mddev_unlock(mddev);
3638 }
3639 /* on success, candidates will be empty, on error
3640 * it won't...
3641 */
3642 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
3643 export_rdev(rdev);
3644 mddev_put(mddev);
3645 }
3646 printk(KERN_INFO "md: ... autorun DONE.\n");
3647}
fdee8ae4 3648#endif /* !MODULE */
1da177e4 3649
1da177e4
LT		 3650static int get_version(void __user * arg)
3651{
3652 mdu_version_t ver;
3653
3654 ver.major = MD_MAJOR_VERSION;
3655 ver.minor = MD_MINOR_VERSION;
3656 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3657
3658 if (copy_to_user(arg, &ver, sizeof(ver)))
3659 return -EFAULT;
3660
3661 return 0;
3662}
3663
3664static int get_array_info(mddev_t * mddev, void __user * arg)
3665{
3666 mdu_array_info_t info;
3667 int nr,working,active,failed,spare;
3668 mdk_rdev_t *rdev;
3669 struct list_head *tmp;
3670
3671 nr=working=active=failed=spare=0;
3672 ITERATE_RDEV(mddev,rdev,tmp) {
3673 nr++;
b2d444d7 3674 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3675 failed++;
3676 else {
3677 working++;
b2d444d7 3678 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 3679 active++;
3680 else
3681 spare++;
3682 }
3683 }
3684
3685 info.major_version = mddev->major_version;
3686 info.minor_version = mddev->minor_version;
3687 info.patch_version = MD_PATCHLEVEL_VERSION;
3688 info.ctime = mddev->ctime;
3689 info.level = mddev->level;
3690 info.size = mddev->size;
284ae7ca
N		 3691 if (info.size != mddev->size) /* overflow */
3692 info.size = -1;
1da177e4
LT		 3693 info.nr_disks = nr;
3694 info.raid_disks = mddev->raid_disks;
3695 info.md_minor = mddev->md_minor;
3696 info.not_persistent= !mddev->persistent;
3697
3698 info.utime = mddev->utime;
3699 info.state = 0;
3700 if (mddev->in_sync)
3701 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 3702 if (mddev->bitmap && mddev->bitmap_offset)
3703 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 3704 info.active_disks = active;
3705 info.working_disks = working;
3706 info.failed_disks = failed;
3707 info.spare_disks = spare;
3708
3709 info.layout = mddev->layout;
3710 info.chunk_size = mddev->chunk_size;
3711
3712 if (copy_to_user(arg, &info, sizeof(info)))
3713 return -EFAULT;
3714
3715 return 0;
3716}
3717
87162a28 3718static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 3719{
3720 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3721 char *ptr, *buf = NULL;
3722 int err = -ENOMEM;
3723
2a2275d6
N		 3724 md_allow_write(mddev);
3725
32a7627c
N		 3726 file = kmalloc(sizeof(*file), GFP_KERNEL);
3727 if (!file)
3728 goto out;
3729
3730 /* bitmap disabled, zero the first byte and copy out */
3731 if (!mddev->bitmap || !mddev->bitmap->file) {
3732 file->pathname[0] = '\0';
3733 goto copy_out;
3734 }
3735
3736 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3737 if (!buf)
3738 goto out;
3739
3740 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3741 if (!ptr)
3742 goto out;
3743
3744 strcpy(file->pathname, ptr);
3745
3746copy_out:
3747 err = 0;
3748 if (copy_to_user(arg, file, sizeof(*file)))
3749 err = -EFAULT;
3750out:
3751 kfree(buf);
3752 kfree(file);
3753 return err;
3754}
3755
1da177e4
LT		 3756static int get_disk_info(mddev_t * mddev, void __user * arg)
3757{
3758 mdu_disk_info_t info;
3759 unsigned int nr;
3760 mdk_rdev_t *rdev;
3761
3762 if (copy_from_user(&info, arg, sizeof(info)))
3763 return -EFAULT;
3764
3765 nr = info.number;
3766
3767 rdev = find_rdev_nr(mddev, nr);
3768 if (rdev) {
3769 info.major = MAJOR(rdev->bdev->bd_dev);
3770 info.minor = MINOR(rdev->bdev->bd_dev);
3771 info.raid_disk = rdev->raid_disk;
3772 info.state = 0;
b2d444d7 3773 if (test_bit(Faulty, &rdev->flags))
1da177e4 3774 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 3775 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 3776 info.state |= (1<<MD_DISK_ACTIVE);
3777 info.state |= (1<<MD_DISK_SYNC);
3778 }
8ddf9efe
N		 3779 if (test_bit(WriteMostly, &rdev->flags))
3780 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 3781 } else {
3782 info.major = info.minor = 0;
3783 info.raid_disk = -1;
3784 info.state = (1<<MD_DISK_REMOVED);
3785 }
3786
3787 if (copy_to_user(arg, &info, sizeof(info)))
3788 return -EFAULT;
3789
3790 return 0;
3791}
3792
3793static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3794{
3795 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3796 mdk_rdev_t *rdev;
3797 dev_t dev = MKDEV(info->major,info->minor);
3798
3799 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3800 return -EOVERFLOW;
3801
3802 if (!mddev->raid_disks) {
3803 int err;
3804 /* expecting a device which has a superblock */
3805 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3806 if (IS_ERR(rdev)) {
3807 printk(KERN_WARNING
3808 "md: md_import_device returned %ld\n",
3809 PTR_ERR(rdev));
3810 return PTR_ERR(rdev);
3811 }
3812 if (!list_empty(&mddev->disks)) {
3813 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3814 mdk_rdev_t, same_set);
3815 int err = super_types[mddev->major_version]
3816 .load_super(rdev, rdev0, mddev->minor_version);
3817 if (err < 0) {
3818 printk(KERN_WARNING
3819 "md: %s has different UUID to %s\n",
3820 bdevname(rdev->bdev,b),
3821 bdevname(rdev0->bdev,b2));
3822 export_rdev(rdev);
3823 return -EINVAL;
3824 }
3825 }
3826 err = bind_rdev_to_array(rdev, mddev);
3827 if (err)
3828 export_rdev(rdev);
3829 return err;
3830 }
3831
3832 /*
3833 * add_new_disk can be used once the array is assembled
3834 * to add "hot spares". They must already have a superblock
3835 * written
3836 */
3837 if (mddev->pers) {
3838 int err;
3839 if (!mddev->pers->hot_add_disk) {
3840 printk(KERN_WARNING
3841 "%s: personality does not support diskops!\n",
3842 mdname(mddev));
3843 return -EINVAL;
3844 }
7b1e35f6
N		 3845 if (mddev->persistent)
3846 rdev = md_import_device(dev, mddev->major_version,
3847 mddev->minor_version);
3848 else
3849 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 3850 if (IS_ERR(rdev)) {
3851 printk(KERN_WARNING
3852 "md: md_import_device returned %ld\n",
3853 PTR_ERR(rdev));
3854 return PTR_ERR(rdev);
3855 }
41158c7e
N		 3856 /* set save_raid_disk if appropriate */
3857 if (!mddev->persistent) {
3858 if (info->state & (1<<MD_DISK_SYNC) &&
3859 info->raid_disk < mddev->raid_disks)
3860 rdev->raid_disk = info->raid_disk;
3861 else
3862 rdev->raid_disk = -1;
3863 } else
3864 super_types[mddev->major_version].
3865 validate_super(mddev, rdev);
3866 rdev->saved_raid_disk = rdev->raid_disk;
3867
b2d444d7 3868 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 3869 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3870 set_bit(WriteMostly, &rdev->flags);
3871
1da177e4
LT		 3872 rdev->raid_disk = -1;
3873 err = bind_rdev_to_array(rdev, mddev);
7c7546cc
N		 3874 if (!err && !mddev->pers->hot_remove_disk) {
3875 /* If there is hot_add_disk but no hot_remove_disk
3876 * then added disks for geometry changes,
3877 * and should be added immediately.
3878 */
3879 super_types[mddev->major_version].
3880 validate_super(mddev, rdev);
3881 err = mddev->pers->hot_add_disk(mddev, rdev);
3882 if (err)
3883 unbind_rdev_from_array(rdev);
3884 }
1da177e4
LT		 3885 if (err)
3886 export_rdev(rdev);
c361777f 3887
17571284 3888 md_update_sb(mddev, 1);
c361777f 3889 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 3890 md_wakeup_thread(mddev->thread);
1da177e4
LT		 3891 return err;
3892 }
3893
3894 /* otherwise, add_new_disk is only allowed
3895 * for major_version==0 superblocks
3896 */
3897 if (mddev->major_version != 0) {
3898 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3899 mdname(mddev));
3900 return -EINVAL;
3901 }
3902
3903 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3904 int err;
3905 rdev = md_import_device (dev, -1, 0);
3906 if (IS_ERR(rdev)) {
3907 printk(KERN_WARNING
3908 "md: error, md_import_device() returned %ld\n",
3909 PTR_ERR(rdev));
3910 return PTR_ERR(rdev);
3911 }
3912 rdev->desc_nr = info->number;
3913 if (info->raid_disk < mddev->raid_disks)
3914 rdev->raid_disk = info->raid_disk;
3915 else
3916 rdev->raid_disk = -1;
3917
b2d444d7
N		 3918 rdev->flags = 0;
3919
1da177e4 3920 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 3921 if (info->state & (1<<MD_DISK_SYNC))
3922 set_bit(In_sync, &rdev->flags);
1da177e4 3923
8ddf9efe
N		 3924 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3925 set_bit(WriteMostly, &rdev->flags);
3926
1da177e4
LT		 3927 if (!mddev->persistent) {
3928 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3929 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3930 } else
3931 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3932 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3933
2bf071bf
N		 3934 err = bind_rdev_to_array(rdev, mddev);
3935 if (err) {
3936 export_rdev(rdev);
3937 return err;
3938 }
1da177e4
LT		 3939 }
3940
3941 return 0;
3942}
3943
3944static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3945{
3946 char b[BDEVNAME_SIZE];
3947 mdk_rdev_t *rdev;
3948
3949 if (!mddev->pers)
3950 return -ENODEV;
3951
3952 rdev = find_rdev(mddev, dev);
3953 if (!rdev)
3954 return -ENXIO;
3955
3956 if (rdev->raid_disk >= 0)
3957 goto busy;
3958
3959 kick_rdev_from_array(rdev);
850b2b42 3960 md_update_sb(mddev, 1);
d7603b7e 3961 md_new_event(mddev);
1da177e4
LT		 3962
3963 return 0;
3964busy:
3965 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3966 bdevname(rdev->bdev,b), mdname(mddev));
3967 return -EBUSY;
3968}
3969
3970static int hot_add_disk(mddev_t * mddev, dev_t dev)
3971{
3972 char b[BDEVNAME_SIZE];
3973 int err;
3974 unsigned int size;
3975 mdk_rdev_t *rdev;
3976
3977 if (!mddev->pers)
3978 return -ENODEV;
3979
3980 if (mddev->major_version != 0) {
3981 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3982 " version-0 superblocks.\n",
3983 mdname(mddev));
3984 return -EINVAL;
3985 }
3986 if (!mddev->pers->hot_add_disk) {
3987 printk(KERN_WARNING
3988 "%s: personality does not support diskops!\n",
3989 mdname(mddev));
3990 return -EINVAL;
3991 }
3992
3993 rdev = md_import_device (dev, -1, 0);
3994 if (IS_ERR(rdev)) {
3995 printk(KERN_WARNING
3996 "md: error, md_import_device() returned %ld\n",
3997 PTR_ERR(rdev));
3998 return -EINVAL;
3999 }
4000
4001 if (mddev->persistent)
4002 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
4003 else
4004 rdev->sb_offset =
4005 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4006
4007 size = calc_dev_size(rdev, mddev->chunk_size);
4008 rdev->size = size;
4009
b2d444d7 4010 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4011 printk(KERN_WARNING
4012 "md: can not hot-add faulty %s disk to %s!\n",
4013 bdevname(rdev->bdev,b), mdname(mddev));
4014 err = -EINVAL;
4015 goto abort_export;
4016 }
b2d444d7 4017 clear_bit(In_sync, &rdev->flags);
1da177e4 4018 rdev->desc_nr = -1;
5842730d 4019 rdev->saved_raid_disk = -1;
2bf071bf
N		 4020 err = bind_rdev_to_array(rdev, mddev);
4021 if (err)
4022 goto abort_export;
1da177e4
LT		 4023
4024 /*
4025 * The rest should better be atomic, we can have disk failures
4026 * noticed in interrupt contexts ...
4027 */
4028
4029 if (rdev->desc_nr == mddev->max_disks) {
4030 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
4031 mdname(mddev));
4032 err = -EBUSY;
4033 goto abort_unbind_export;
4034 }
4035
4036 rdev->raid_disk = -1;
4037
850b2b42 4038 md_update_sb(mddev, 1);
1da177e4
LT		 4039
4040 /*
4041 * Kick recovery, maybe this spare has to be added to the
4042 * array immediately.
4043 */
4044 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4045 md_wakeup_thread(mddev->thread);
d7603b7e 4046 md_new_event(mddev);
1da177e4
LT		 4047 return 0;
4048
4049abort_unbind_export:
4050 unbind_rdev_from_array(rdev);
4051
4052abort_export:
4053 export_rdev(rdev);
4054 return err;
4055}
4056
32a7627c
N		 4057static int set_bitmap_file(mddev_t *mddev, int fd)
4058{
4059 int err;
4060
36fa3063
N		 4061 if (mddev->pers) {
4062 if (!mddev->pers->quiesce)
4063 return -EBUSY;
4064 if (mddev->recovery || mddev->sync_thread)
4065 return -EBUSY;
4066 /* we should be able to change the bitmap.. */
4067 }
32a7627c 4068
32a7627c 4069
36fa3063
N		 4070 if (fd >= 0) {
4071 if (mddev->bitmap)
4072 return -EEXIST; /* cannot add when bitmap is present */
4073 mddev->bitmap_file = fget(fd);
32a7627c 4074
36fa3063
N		 4075 if (mddev->bitmap_file == NULL) {
4076 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4077 mdname(mddev));
4078 return -EBADF;
4079 }
4080
4081 err = deny_bitmap_write_access(mddev->bitmap_file);
4082 if (err) {
4083 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4084 mdname(mddev));
4085 fput(mddev->bitmap_file);
4086 mddev->bitmap_file = NULL;
4087 return err;
4088 }
a654b9d8 4089 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 4090 } else if (mddev->bitmap == NULL)
4091 return -ENOENT; /* cannot remove what isn't there */
4092 err = 0;
4093 if (mddev->pers) {
4094 mddev->pers->quiesce(mddev, 1);
4095 if (fd >= 0)
4096 err = bitmap_create(mddev);
d7375ab3 4097 if (fd < 0 || err) {
36fa3063 4098 bitmap_destroy(mddev);
d7375ab3
N		 4099 fd = -1; /* make sure to put the file */
4100 }
36fa3063 4101 mddev->pers->quiesce(mddev, 0);
d7375ab3
N		 4102 }
4103 if (fd < 0) {
acc55e22
N		 4104 if (mddev->bitmap_file) {
4105 restore_bitmap_write_access(mddev->bitmap_file);
36fa3063 4106 fput(mddev->bitmap_file);
acc55e22 4107 }
36fa3063
N		 4108 mddev->bitmap_file = NULL;
4109 }
4110
32a7627c
N		 4111 return err;
4112}
4113
1da177e4
LT		 4114/*
4115 * set_array_info is used two different ways
4116 * The original usage is when creating a new array.
4117 * In this usage, raid_disks is > 0 and it together with
4118 * level, size, not_persistent,layout,chunksize determine the
4119 * shape of the array.
4120 * This will always create an array with a type-0.90.0 superblock.
4121 * The newer usage is when assembling an array.
4122 * In this case raid_disks will be 0, and the major_version field is
4123 * use to determine which style super-blocks are to be found on the devices.
4124 * The minor and patch _version numbers are also kept incase the
4125 * super_block handler wishes to interpret them.
4126 */
4127static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4128{
4129
4130 if (info->raid_disks == 0) {
4131 /* just setting version number for superblock loading */
4132 if (info->major_version < 0 ||
50511da3 4133 info->major_version >= ARRAY_SIZE(super_types) ||
1da177e4
LT		 4134 super_types[info->major_version].name == NULL) {
4135 /* maybe try to auto-load a module? */
4136 printk(KERN_INFO
4137 "md: superblock version %d not known\n",
4138 info->major_version);
4139 return -EINVAL;
4140 }
4141 mddev->major_version = info->major_version;
4142 mddev->minor_version = info->minor_version;
4143 mddev->patch_version = info->patch_version;
3f9d7b0d 4144 mddev->persistent = !info->not_persistent;
1da177e4
LT		 4145 return 0;
4146 }
4147 mddev->major_version = MD_MAJOR_VERSION;
4148 mddev->minor_version = MD_MINOR_VERSION;
4149 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4150 mddev->ctime = get_seconds();
4151
4152 mddev->level = info->level;
17115e03 4153 mddev->clevel[0] = 0;
1da177e4
LT		 4154 mddev->size = info->size;
4155 mddev->raid_disks = info->raid_disks;
4156 /* don't set md_minor, it is determined by which /dev/md* was
4157 * openned
4158 */
4159 if (info->state & (1<<MD_SB_CLEAN))
4160 mddev->recovery_cp = MaxSector;
4161 else
4162 mddev->recovery_cp = 0;
4163 mddev->persistent = ! info->not_persistent;
4164
4165 mddev->layout = info->layout;
4166 mddev->chunk_size = info->chunk_size;
4167
4168 mddev->max_disks = MD_SB_DISKS;
4169
850b2b42
N		 4170 mddev->flags = 0;
4171 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 4172
b2a2703c
N		 4173 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4174 mddev->bitmap_offset = 0;
4175
f6705578
N		 4176 mddev->reshape_position = MaxSector;
4177
1da177e4
LT		 4178 /*
4179 * Generate a 128 bit UUID
4180 */
4181 get_random_bytes(mddev->uuid, 16);
4182
f6705578
N		 4183 mddev->new_level = mddev->level;
4184 mddev->new_chunk = mddev->chunk_size;
4185 mddev->new_layout = mddev->layout;
4186 mddev->delta_disks = 0;
4187
1da177e4
LT		 4188 return 0;
4189}
4190
a35b0d69
N		 4191static int update_size(mddev_t *mddev, unsigned long size)
4192{
4193 mdk_rdev_t * rdev;
4194 int rv;
4195 struct list_head *tmp;
8ddeeae5 4196 int fit = (size == 0);
a35b0d69
N		 4197
4198 if (mddev->pers->resize == NULL)
4199 return -EINVAL;
4200 /* The "size" is the amount of each device that is used.
4201 * This can only make sense for arrays with redundancy.
4202 * linear and raid0 always use whatever space is available
4203 * We can only consider changing the size if no resync
4204 * or reconstruction is happening, and if the new size
4205 * is acceptable. It must fit before the sb_offset or,
4206 * if that is <data_offset, it must fit before the
4207 * size of each device.
4208 * If size is zero, we find the largest size that fits.
4209 */
4210 if (mddev->sync_thread)
4211 return -EBUSY;
4212 ITERATE_RDEV(mddev,rdev,tmp) {
4213 sector_t avail;
01ab5662
N		 4214 avail = rdev->size * 2;
4215
a35b0d69
N		 4216 if (fit && (size == 0 || size > avail/2))
4217 size = avail/2;
4218 if (avail < ((sector_t)size << 1))
4219 return -ENOSPC;
4220 }
4221 rv = mddev->pers->resize(mddev, (sector_t)size *2);
4222 if (!rv) {
4223 struct block_device *bdev;
4224
4225 bdev = bdget_disk(mddev->gendisk, 0);
4226 if (bdev) {
1b1dcc1b 4227 mutex_lock(&bdev->bd_inode->i_mutex);
6d89332b 4228 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
1b1dcc1b 4229 mutex_unlock(&bdev->bd_inode->i_mutex);
a35b0d69
N		 4230 bdput(bdev);
4231 }
4232 }
4233 return rv;
4234}
4235
da943b99
N		 4236static int update_raid_disks(mddev_t *mddev, int raid_disks)
4237{
4238 int rv;
4239 /* change the number of raid disks */
63c70c4f 4240 if (mddev->pers->check_reshape == NULL)
da943b99
N		 4241 return -EINVAL;
4242 if (raid_disks <= 0 ||
4243 raid_disks >= mddev->max_disks)
4244 return -EINVAL;
63c70c4f 4245 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
da943b99 4246 return -EBUSY;
63c70c4f
N		 4247 mddev->delta_disks = raid_disks - mddev->raid_disks;
4248
4249 rv = mddev->pers->check_reshape(mddev);
da943b99
N		 4250 return rv;
4251}
4252
4253
1da177e4
LT		 4254/*
4255 * update_array_info is used to change the configuration of an
4256 * on-line array.
4257 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4258 * fields in the info are checked against the array.
4259 * Any differences that cannot be handled will cause an error.
4260 * Normally, only one change can be managed at a time.
4261 */
4262static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4263{
4264 int rv = 0;
4265 int cnt = 0;
36fa3063
N		 4266 int state = 0;
4267
4268 /* calculate expected state,ignoring low bits */
4269 if (mddev->bitmap && mddev->bitmap_offset)
4270 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 4271
4272 if (mddev->major_version != info->major_version ||
4273 mddev->minor_version != info->minor_version ||
4274/* mddev->patch_version != info->patch_version || */
4275 mddev->ctime != info->ctime ||
4276 mddev->level != info->level ||
4277/* mddev->layout != info->layout || */
4278 !mddev->persistent != info->not_persistent||
36fa3063
N		 4279 mddev->chunk_size != info->chunk_size ||
4280 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4281 ((state^info->state) & 0xfffffe00)
4282 )
1da177e4
LT		 4283 return -EINVAL;
4284 /* Check there is only one change */
284ae7ca 4285 if (info->size >= 0 && mddev->size != info->size) cnt++;
1da177e4
LT		 4286 if (mddev->raid_disks != info->raid_disks) cnt++;
4287 if (mddev->layout != info->layout) cnt++;
36fa3063 4288 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 4289 if (cnt == 0) return 0;
4290 if (cnt > 1) return -EINVAL;
4291
4292 if (mddev->layout != info->layout) {
4293 /* Change layout
4294 * we don't need to do anything at the md level, the
4295 * personality will take care of it all.
4296 */
4297 if (mddev->pers->reconfig == NULL)
4298 return -EINVAL;
4299 else
4300 return mddev->pers->reconfig(mddev, info->layout, -1);
4301 }
284ae7ca 4302 if (info->size >= 0 && mddev->size != info->size)
a35b0d69
N		 4303 rv = update_size(mddev, info->size);
4304
da943b99
N		 4305 if (mddev->raid_disks != info->raid_disks)
4306 rv = update_raid_disks(mddev, info->raid_disks);
4307
36fa3063
N		 4308 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4309 if (mddev->pers->quiesce == NULL)
4310 return -EINVAL;
4311 if (mddev->recovery || mddev->sync_thread)
4312 return -EBUSY;
4313 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4314 /* add the bitmap */
4315 if (mddev->bitmap)
4316 return -EEXIST;
4317 if (mddev->default_bitmap_offset == 0)
4318 return -EINVAL;
4319 mddev->bitmap_offset = mddev->default_bitmap_offset;
4320 mddev->pers->quiesce(mddev, 1);
4321 rv = bitmap_create(mddev);
4322 if (rv)
4323 bitmap_destroy(mddev);
4324 mddev->pers->quiesce(mddev, 0);
4325 } else {
4326 /* remove the bitmap */
4327 if (!mddev->bitmap)
4328 return -ENOENT;
4329 if (mddev->bitmap->file)
4330 return -EINVAL;
4331 mddev->pers->quiesce(mddev, 1);
4332 bitmap_destroy(mddev);
4333 mddev->pers->quiesce(mddev, 0);
4334 mddev->bitmap_offset = 0;
4335 }
4336 }
850b2b42 4337 md_update_sb(mddev, 1);
1da177e4
LT		 4338 return rv;
4339}
4340
4341static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4342{
4343 mdk_rdev_t *rdev;
4344
4345 if (mddev->pers == NULL)
4346 return -ENODEV;
4347
4348 rdev = find_rdev(mddev, dev);
4349 if (!rdev)
4350 return -ENODEV;
4351
4352 md_error(mddev, rdev);
4353 return 0;
4354}
4355
a885c8c4
CH		 4356static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4357{
4358 mddev_t *mddev = bdev->bd_disk->private_data;
4359
4360 geo->heads = 2;
4361 geo->sectors = 4;
4362 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4363 return 0;
4364}
4365
1da177e4
LT		 4366static int md_ioctl(struct inode *inode, struct file *file,
4367 unsigned int cmd, unsigned long arg)
4368{
4369 int err = 0;
4370 void __user *argp = (void __user *)arg;
1da177e4
LT		 4371 mddev_t *mddev = NULL;
4372
4373 if (!capable(CAP_SYS_ADMIN))
4374 return -EACCES;
4375
4376 /*
4377 * Commands dealing with the RAID driver but not any
4378 * particular array:
4379 */
4380 switch (cmd)
4381 {
4382 case RAID_VERSION:
4383 err = get_version(argp);
4384 goto done;
4385
4386 case PRINT_RAID_DEBUG:
4387 err = 0;
4388 md_print_devices();
4389 goto done;
4390
4391#ifndef MODULE
4392 case RAID_AUTORUN:
4393 err = 0;
4394 autostart_arrays(arg);
4395 goto done;
4396#endif
4397 default:;
4398 }
4399
4400 /*
4401 * Commands creating/starting a new array:
4402 */
4403
4404 mddev = inode->i_bdev->bd_disk->private_data;
4405
4406 if (!mddev) {
4407 BUG();
4408 goto abort;
4409 }
4410
1da177e4
LT		 4411 err = mddev_lock(mddev);
4412 if (err) {
4413 printk(KERN_INFO
4414 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4415 err, cmd);
4416 goto abort;
4417 }
4418
4419 switch (cmd)
4420 {
4421 case SET_ARRAY_INFO:
4422 {
4423 mdu_array_info_t info;
4424 if (!arg)
4425 memset(&info, 0, sizeof(info));
4426 else if (copy_from_user(&info, argp, sizeof(info))) {
4427 err = -EFAULT;
4428 goto abort_unlock;
4429 }
4430 if (mddev->pers) {
4431 err = update_array_info(mddev, &info);
4432 if (err) {
4433 printk(KERN_WARNING "md: couldn't update"
4434 " array info. %d\n", err);
4435 goto abort_unlock;
4436 }
4437 goto done_unlock;
4438 }
4439 if (!list_empty(&mddev->disks)) {
4440 printk(KERN_WARNING
4441 "md: array %s already has disks!\n",
4442 mdname(mddev));
4443 err = -EBUSY;
4444 goto abort_unlock;
4445 }
4446 if (mddev->raid_disks) {
4447 printk(KERN_WARNING
4448 "md: array %s already initialised!\n",
4449 mdname(mddev));
4450 err = -EBUSY;
4451 goto abort_unlock;
4452 }
4453 err = set_array_info(mddev, &info);
4454 if (err) {
4455 printk(KERN_WARNING "md: couldn't set"
4456 " array info. %d\n", err);
4457 goto abort_unlock;
4458 }
4459 }
4460 goto done_unlock;
4461
4462 default:;
4463 }
4464
4465 /*
4466 * Commands querying/configuring an existing array:
4467 */
32a7627c 4468 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3f9d7b0d 4469 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
32a7627c 4470 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3f9d7b0d
N		 4471 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4472 && cmd != GET_BITMAP_FILE) {
1da177e4
LT		 4473 err = -ENODEV;
4474 goto abort_unlock;
4475 }
4476
4477 /*
4478 * Commands even a read-only array can execute:
4479 */
4480 switch (cmd)
4481 {
4482 case GET_ARRAY_INFO:
4483 err = get_array_info(mddev, argp);
4484 goto done_unlock;
4485
32a7627c 4486 case GET_BITMAP_FILE:
87162a28 4487 err = get_bitmap_file(mddev, argp);
32a7627c
N		 4488 goto done_unlock;
4489
1da177e4
LT		 4490 case GET_DISK_INFO:
4491 err = get_disk_info(mddev, argp);
4492 goto done_unlock;
4493
4494 case RESTART_ARRAY_RW:
4495 err = restart_array(mddev);
4496 goto done_unlock;
4497
4498 case STOP_ARRAY:
4499 err = do_md_stop (mddev, 0);
4500 goto done_unlock;
4501
4502 case STOP_ARRAY_RO:
4503 err = do_md_stop (mddev, 1);
4504 goto done_unlock;
4505
4506 /*
4507 * We have a problem here : there is no easy way to give a CHS
4508 * virtual geometry. We currently pretend that we have a 2 heads
4509 * 4 sectors (with a BIG number of cylinders...). This drives
4510 * dosfs just mad... ;-)
4511 */
1da177e4
LT		 4512 }
4513
4514 /*
4515 * The remaining ioctls are changing the state of the
f91de92e
N		 4516 * superblock, so we do not allow them on read-only arrays.
4517 * However non-MD ioctls (e.g. get-size) will still come through
4518 * here and hit the 'default' below, so only disallow
4519 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 4520 */
f91de92e
N		 4521 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4522 mddev->ro && mddev->pers) {
4523 if (mddev->ro == 2) {
4524 mddev->ro = 0;
4525 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4526 md_wakeup_thread(mddev->thread);
4527
4528 } else {
4529 err = -EROFS;
4530 goto abort_unlock;
4531 }
1da177e4
LT		 4532 }
4533
4534 switch (cmd)
4535 {
4536 case ADD_NEW_DISK:
4537 {
4538 mdu_disk_info_t info;
4539 if (copy_from_user(&info, argp, sizeof(info)))
4540 err = -EFAULT;
4541 else
4542 err = add_new_disk(mddev, &info);
4543 goto done_unlock;
4544 }
4545
4546 case HOT_REMOVE_DISK:
4547 err = hot_remove_disk(mddev, new_decode_dev(arg));
4548 goto done_unlock;
4549
4550 case HOT_ADD_DISK:
4551 err = hot_add_disk(mddev, new_decode_dev(arg));
4552 goto done_unlock;
4553
4554 case SET_DISK_FAULTY:
4555 err = set_disk_faulty(mddev, new_decode_dev(arg));
4556 goto done_unlock;
4557
4558 case RUN_ARRAY:
4559 err = do_md_run (mddev);
4560 goto done_unlock;
4561
32a7627c
N		 4562 case SET_BITMAP_FILE:
4563 err = set_bitmap_file(mddev, (int)arg);
4564 goto done_unlock;
4565
1da177e4 4566 default:
1da177e4
LT		 4567 err = -EINVAL;
4568 goto abort_unlock;
4569 }
4570
4571done_unlock:
4572abort_unlock:
4573 mddev_unlock(mddev);
4574
4575 return err;
4576done:
4577 if (err)
4578 MD_BUG();
4579abort:
4580 return err;
4581}
4582
4583static int md_open(struct inode *inode, struct file *file)
4584{
4585 /*
4586 * Succeed if we can lock the mddev, which confirms that
4587 * it isn't being stopped right now.
4588 */
4589 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4590 int err;
4591
d63a5a74 4592 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
1da177e4
LT		 4593 goto out;
4594
4595 err = 0;
4596 mddev_get(mddev);
4597 mddev_unlock(mddev);
4598
4599 check_disk_change(inode->i_bdev);
4600 out:
4601 return err;
4602}
4603
4604static int md_release(struct inode *inode, struct file * file)
4605{
4606 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4607
52e5f9d1 4608 BUG_ON(!mddev);
1da177e4
LT		 4609 mddev_put(mddev);
4610
4611 return 0;
4612}
4613
44ce6294
LT		 4614static int md_media_changed(struct gendisk *disk)
4615{
4616 mddev_t *mddev = disk->private_data;
4617
4618 return mddev->changed;
4619}
4620
4621static int md_revalidate(struct gendisk *disk)
4622{
4623 mddev_t *mddev = disk->private_data;
4624
4625 mddev->changed = 0;
4626 return 0;
4627}
1da177e4
LT		 4628static struct block_device_operations md_fops =
4629{
4630 .owner = THIS_MODULE,
4631 .open = md_open,
4632 .release = md_release,
4633 .ioctl = md_ioctl,
a885c8c4 4634 .getgeo = md_getgeo,
44ce6294
LT		 4635 .media_changed = md_media_changed,
4636 .revalidate_disk= md_revalidate,
1da177e4
LT		 4637};
4638
75c96f85 4639static int md_thread(void * arg)
1da177e4
LT		 4640{
4641 mdk_thread_t *thread = arg;
4642
1da177e4
LT		 4643 /*
4644 * md_thread is a 'system-thread', it's priority should be very
4645 * high. We avoid resource deadlocks individually in each
4646 * raid personality. (RAID5 does preallocation) We also use RR and
4647 * the very same RT priority as kswapd, thus we will never get
4648 * into a priority inversion deadlock.
4649 *
4650 * we definitely have to have equal or higher priority than
4651 * bdflush, otherwise bdflush will deadlock if there are too
4652 * many dirty RAID5 blocks.
4653 */
1da177e4 4654
6985c43f 4655 allow_signal(SIGKILL);
a6fb0934 4656 while (!kthread_should_stop()) {
1da177e4 4657
93588e22
N		 4658 /* We need to wait INTERRUPTIBLE so that
4659 * we don't add to the load-average.
4660 * That means we need to be sure no signals are
4661 * pending
4662 */
4663 if (signal_pending(current))
4664 flush_signals(current);
4665
4666 wait_event_interruptible_timeout
4667 (thread->wqueue,
4668 test_bit(THREAD_WAKEUP, &thread->flags)
4669 || kthread_should_stop(),
4670 thread->timeout);
1da177e4
LT		 4671
4672 clear_bit(THREAD_WAKEUP, &thread->flags);
4673
787453c2 4674 thread->run(thread->mddev);
1da177e4 4675 }
a6fb0934 4676
1da177e4
LT		 4677 return 0;
4678}
4679
4680void md_wakeup_thread(mdk_thread_t *thread)
4681{
4682 if (thread) {
4683 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4684 set_bit(THREAD_WAKEUP, &thread->flags);
4685 wake_up(&thread->wqueue);
4686 }
4687}
4688
4689mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4690 const char *name)
4691{
4692 mdk_thread_t *thread;
1da177e4 4693
9ffae0cf 4694 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 4695 if (!thread)
4696 return NULL;
4697
1da177e4
LT		 4698 init_waitqueue_head(&thread->wqueue);
4699
1da177e4
LT		 4700 thread->run = run;
4701 thread->mddev = mddev;
32a7627c 4702 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 4703 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 4704 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 4705 kfree(thread);
4706 return NULL;
4707 }
1da177e4
LT		 4708 return thread;
4709}
4710
1da177e4
LT		 4711void md_unregister_thread(mdk_thread_t *thread)
4712{
d28446fe 4713 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
a6fb0934
N		 4714
4715 kthread_stop(thread->tsk);
1da177e4
LT		 4716 kfree(thread);
4717}
4718
4719void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4720{
4721 if (!mddev) {
4722 MD_BUG();
4723 return;
4724 }
4725
b2d444d7 4726 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 4727 return;
32a7627c 4728/*
1da177e4
LT		 4729 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4730 mdname(mddev),
4731 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4732 __builtin_return_address(0),__builtin_return_address(1),
4733 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 4734*/
d0a0a5ee
AM		 4735 if (!mddev->pers)
4736 return;
1da177e4
LT		 4737 if (!mddev->pers->error_handler)
4738 return;
4739 mddev->pers->error_handler(mddev,rdev);
4740 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4741 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4742 md_wakeup_thread(mddev->thread);
c331eb04 4743 md_new_event_inintr(mddev);
1da177e4
LT		 4744}
4745
4746/* seq_file implementation /proc/mdstat */
4747
4748static void status_unused(struct seq_file *seq)
4749{
4750 int i = 0;
4751 mdk_rdev_t *rdev;
4752 struct list_head *tmp;
4753
4754 seq_printf(seq, "unused devices: ");
4755
4756 ITERATE_RDEV_PENDING(rdev,tmp) {
4757 char b[BDEVNAME_SIZE];
4758 i++;
4759 seq_printf(seq, "%s ",
4760 bdevname(rdev->bdev,b));
4761 }
4762 if (!i)
4763 seq_printf(seq, "<none>");
4764
4765 seq_printf(seq, "\n");
4766}
4767
4768
4769static void status_resync(struct seq_file *seq, mddev_t * mddev)
4770{
4588b42e
N		 4771 sector_t max_blocks, resync, res;
4772 unsigned long dt, db, rt;
4773 int scale;
4774 unsigned int per_milli;
1da177e4
LT		 4775
4776 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4777
4778 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4779 max_blocks = mddev->resync_max_sectors >> 1;
4780 else
4781 max_blocks = mddev->size;
4782
4783 /*
4784 * Should not happen.
4785 */
4786 if (!max_blocks) {
4787 MD_BUG();
4788 return;
4789 }
4588b42e
N		 4790 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4791 * in a sector_t, and (max_blocks>>scale) will fit in a
4792 * u32, as those are the requirements for sector_div.
4793 * Thus 'scale' must be at least 10
4794 */
4795 scale = 10;
4796 if (sizeof(sector_t) > sizeof(unsigned long)) {
4797 while ( max_blocks/2 > (1ULL<<(scale+32)))
4798 scale++;
4799 }
4800 res = (resync>>scale)*1000;
4801 sector_div(res, (u32)((max_blocks>>scale)+1));
4802
4803 per_milli = res;
1da177e4 4804 {
4588b42e 4805 int i, x = per_milli/50, y = 20-x;
1da177e4
LT		 4806 seq_printf(seq, "[");
4807 for (i = 0; i < x; i++)
4808 seq_printf(seq, "=");
4809 seq_printf(seq, ">");
4810 for (i = 0; i < y; i++)
4811 seq_printf(seq, ".");
4812 seq_printf(seq, "] ");
4813 }
4588b42e 4814 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
ccfcc3c1
N		 4815 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
4816 "reshape" :
61df9d91
N		 4817 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
4818 "check" :
4819 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4820 "resync" : "recovery"))),
4821 per_milli/10, per_milli % 10,
4588b42e
N		 4822 (unsigned long long) resync,
4823 (unsigned long long) max_blocks);
1da177e4
LT		 4824
4825 /*
4826 * We do not want to overflow, so the order of operands and
4827 * the * 100 / 100 trick are important. We do a +1 to be
4828 * safe against division by zero. We only estimate anyway.
4829 *
4830 * dt: time from mark until now
4831 * db: blocks written from mark until now
4832 * rt: remaining time
4833 */
4834 dt = ((jiffies - mddev->resync_mark) / HZ);
4835 if (!dt) dt++;
ff4e8d9a
N		 4836 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
4837 - mddev->resync_mark_cnt;
4838 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
1da177e4
LT		 4839
4840 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4841
ff4e8d9a 4842 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
1da177e4
LT		 4843}
4844
4845static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4846{
4847 struct list_head *tmp;
4848 loff_t l = *pos;
4849 mddev_t *mddev;
4850
4851 if (l >= 0x10000)
4852 return NULL;
4853 if (!l--)
4854 /* header */
4855 return (void*)1;
4856
4857 spin_lock(&all_mddevs_lock);
4858 list_for_each(tmp,&all_mddevs)
4859 if (!l--) {
4860 mddev = list_entry(tmp, mddev_t, all_mddevs);
4861 mddev_get(mddev);
4862 spin_unlock(&all_mddevs_lock);
4863 return mddev;
4864 }
4865 spin_unlock(&all_mddevs_lock);
4866 if (!l--)
4867 return (void*)2;/* tail */
4868 return NULL;
4869}
4870
4871static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4872{
4873 struct list_head *tmp;
4874 mddev_t *next_mddev, *mddev = v;
4875
4876 ++*pos;
4877 if (v == (void*)2)
4878 return NULL;
4879
4880 spin_lock(&all_mddevs_lock);
4881 if (v == (void*)1)
4882 tmp = all_mddevs.next;
4883 else
4884 tmp = mddev->all_mddevs.next;
4885 if (tmp != &all_mddevs)
4886 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4887 else {
4888 next_mddev = (void*)2;
4889 *pos = 0x10000;
4890 }
4891 spin_unlock(&all_mddevs_lock);
4892
4893 if (v != (void*)1)
4894 mddev_put(mddev);
4895 return next_mddev;
4896
4897}
4898
4899static void md_seq_stop(struct seq_file *seq, void *v)
4900{
4901 mddev_t *mddev = v;
4902
4903 if (mddev && v != (void*)1 && v != (void*)2)
4904 mddev_put(mddev);
4905}
4906
d7603b7e
N		 4907struct mdstat_info {
4908 int event;
4909};
4910
1da177e4
LT		 4911static int md_seq_show(struct seq_file *seq, void *v)
4912{
4913 mddev_t *mddev = v;
4914 sector_t size;
4915 struct list_head *tmp2;
4916 mdk_rdev_t *rdev;
d7603b7e 4917 struct mdstat_info *mi = seq->private;
32a7627c 4918 struct bitmap *bitmap;
1da177e4
LT		 4919
4920 if (v == (void*)1) {
2604b703 4921 struct mdk_personality *pers;
1da177e4
LT		 4922 seq_printf(seq, "Personalities : ");
4923 spin_lock(&pers_lock);
2604b703
N		 4924 list_for_each_entry(pers, &pers_list, list)
4925 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT		 4926
4927 spin_unlock(&pers_lock);
4928 seq_printf(seq, "\n");
d7603b7e 4929 mi->event = atomic_read(&md_event_count);
1da177e4
LT		 4930 return 0;
4931 }
4932 if (v == (void*)2) {
4933 status_unused(seq);
4934 return 0;
4935 }
4936
5dc5cf7d 4937 if (mddev_lock(mddev) < 0)
1da177e4 4938 return -EINTR;
5dc5cf7d 4939
1da177e4
LT		 4940 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4941 seq_printf(seq, "%s : %sactive", mdname(mddev),
4942 mddev->pers ? "" : "in");
4943 if (mddev->pers) {
f91de92e 4944 if (mddev->ro==1)
1da177e4 4945 seq_printf(seq, " (read-only)");
f91de92e
N		 4946 if (mddev->ro==2)
4947 seq_printf(seq, "(auto-read-only)");
1da177e4
LT		 4948 seq_printf(seq, " %s", mddev->pers->name);
4949 }
4950
4951 size = 0;
4952 ITERATE_RDEV(mddev,rdev,tmp2) {
4953 char b[BDEVNAME_SIZE];
4954 seq_printf(seq, " %s[%d]",
4955 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 4956 if (test_bit(WriteMostly, &rdev->flags))
4957 seq_printf(seq, "(W)");
b2d444d7 4958 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4959 seq_printf(seq, "(F)");
4960 continue;
b325a32e
N		 4961 } else if (rdev->raid_disk < 0)
4962 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 4963 size += rdev->size;
4964 }
4965
4966 if (!list_empty(&mddev->disks)) {
4967 if (mddev->pers)
4968 seq_printf(seq, "\n %llu blocks",
4969 (unsigned long long)mddev->array_size);
4970 else
4971 seq_printf(seq, "\n %llu blocks",
4972 (unsigned long long)size);
4973 }
1cd6bf19
N		 4974 if (mddev->persistent) {
4975 if (mddev->major_version != 0 ||
4976 mddev->minor_version != 90) {
4977 seq_printf(seq," super %d.%d",
4978 mddev->major_version,
4979 mddev->minor_version);
4980 }
4981 } else
4982 seq_printf(seq, " super non-persistent");
1da177e4
LT		 4983
4984 if (mddev->pers) {
4985 mddev->pers->status (seq, mddev);
4986 seq_printf(seq, "\n ");
8e1b39d6
N		 4987 if (mddev->pers->sync_request) {
4988 if (mddev->curr_resync > 2) {
4989 status_resync (seq, mddev);
4990 seq_printf(seq, "\n ");
4991 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4992 seq_printf(seq, "\tresync=DELAYED\n ");
4993 else if (mddev->recovery_cp < MaxSector)
4994 seq_printf(seq, "\tresync=PENDING\n ");
4995 }
32a7627c
N		 4996 } else
4997 seq_printf(seq, "\n ");
4998
4999 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 5000 unsigned long chunk_kb;
5001 unsigned long flags;
32a7627c
N		 5002 spin_lock_irqsave(&bitmap->lock, flags);
5003 chunk_kb = bitmap->chunksize >> 10;
5004 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5005 "%lu%s chunk",
5006 bitmap->pages - bitmap->missing_pages,
5007 bitmap->pages,
5008 (bitmap->pages - bitmap->missing_pages)
5009 << (PAGE_SHIFT - 10),
5010 chunk_kb ? chunk_kb : bitmap->chunksize,
5011 chunk_kb ? "KB" : "B");
78d742d8
N		 5012 if (bitmap->file) {
5013 seq_printf(seq, ", file: ");
c649bb9c
JS		 5014 seq_path(seq, bitmap->file->f_path.mnt,
5015 bitmap->file->f_path.dentry," \t\n");
32a7627c 5016 }
78d742d8 5017
32a7627c
N		 5018 seq_printf(seq, "\n");
5019 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 5020 }
5021
5022 seq_printf(seq, "\n");
5023 }
5024 mddev_unlock(mddev);
5025
5026 return 0;
5027}
5028
5029static struct seq_operations md_seq_ops = {
5030 .start = md_seq_start,
5031 .next = md_seq_next,
5032 .stop = md_seq_stop,
5033 .show = md_seq_show,
5034};
5035
5036static int md_seq_open(struct inode *inode, struct file *file)
5037{
5038 int error;
d7603b7e
N		 5039 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5040 if (mi == NULL)
5041 return -ENOMEM;
1da177e4
LT		 5042
5043 error = seq_open(file, &md_seq_ops);
d7603b7e
N		 5044 if (error)
5045 kfree(mi);
5046 else {
5047 struct seq_file *p = file->private_data;
5048 p->private = mi;
5049 mi->event = atomic_read(&md_event_count);
5050 }
1da177e4
LT		 5051 return error;
5052}
5053
d7603b7e
N		 5054static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5055{
5056 struct seq_file *m = filp->private_data;
5057 struct mdstat_info *mi = m->private;
5058 int mask;
5059
5060 poll_wait(filp, &md_event_waiters, wait);
5061
5062 /* always allow read */
5063 mask = POLLIN | POLLRDNORM;
5064
5065 if (mi->event != atomic_read(&md_event_count))
5066 mask |= POLLERR | POLLPRI;
5067 return mask;
5068}
5069
fa027c2a 5070static const struct file_operations md_seq_fops = {
e24650c2 5071 .owner = THIS_MODULE,
1da177e4
LT		 5072 .open = md_seq_open,
5073 .read = seq_read,
5074 .llseek = seq_lseek,
c3f94b40 5075 .release = seq_release_private,
d7603b7e 5076 .poll = mdstat_poll,
1da177e4
LT		 5077};
5078
2604b703 5079int register_md_personality(struct mdk_personality *p)
1da177e4 5080{
1da177e4 5081 spin_lock(&pers_lock);
2604b703
N		 5082 list_add_tail(&p->list, &pers_list);
5083 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
1da177e4
LT		 5084 spin_unlock(&pers_lock);
5085 return 0;
5086}
5087
2604b703 5088int unregister_md_personality(struct mdk_personality *p)
1da177e4 5089{
2604b703 5090 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 5091 spin_lock(&pers_lock);
2604b703 5092 list_del_init(&p->list);
1da177e4
LT		 5093 spin_unlock(&pers_lock);
5094 return 0;
5095}
5096
5097static int is_mddev_idle(mddev_t *mddev)
5098{
5099 mdk_rdev_t * rdev;
5100 struct list_head *tmp;
5101 int idle;
713f6ab1 5102 long curr_events;
1da177e4
LT		 5103
5104 idle = 1;
5105 ITERATE_RDEV(mddev,rdev,tmp) {
5106 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 5107 curr_events = disk_stat_read(disk, sectors[0]) +
5108 disk_stat_read(disk, sectors[1]) -
1da177e4 5109 atomic_read(&disk->sync_io);
713f6ab1
N		 5110 /* sync IO will cause sync_io to increase before the disk_stats
5111 * as sync_io is counted when a request starts, and
5112 * disk_stats is counted when it completes.
5113 * So resync activity will cause curr_events to be smaller than
5114 * when there was no such activity.
5115 * non-sync IO will cause disk_stat to increase without
5116 * increasing sync_io so curr_events will (eventually)
5117 * be larger than it was before. Once it becomes
5118 * substantially larger, the test below will cause
5119 * the array to appear non-idle, and resync will slow
5120 * down.
5121 * If there is a lot of outstanding resync activity when
5122 * we set last_event to curr_events, then all that activity
5123 * completing might cause the array to appear non-idle
5124 * and resync will be slowed down even though there might
5125 * not have been non-resync activity. This will only
5126 * happen once though. 'last_events' will soon reflect
5127 * the state where there is little or no outstanding
5128 * resync requests, and further resync activity will
5129 * always make curr_events less than last_events.
c0e48521 5130 *
1da177e4 5131 */
713f6ab1 5132 if (curr_events - rdev->last_events > 4096) {
1da177e4
LT		 5133 rdev->last_events = curr_events;
5134 idle = 0;
5135 }
5136 }
5137 return idle;
5138}
5139
5140void md_done_sync(mddev_t *mddev, int blocks, int ok)
5141{
5142 /* another "blocks" (512byte) blocks have been synced */
5143 atomic_sub(blocks, &mddev->recovery_active);
5144 wake_up(&mddev->recovery_wait);
5145 if (!ok) {
5146 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5147 md_wakeup_thread(mddev->thread);
5148 // stop recovery, signal do_sync ....
5149 }
5150}
5151
5152
06d91a5f
N		 5153/* md_write_start(mddev, bi)
5154 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 5155 * in superblock) before writing, schedule a superblock update
5156 * and wait for it to complete.
06d91a5f 5157 */
3d310eb7 5158void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 5159{
06d91a5f 5160 if (bio_data_dir(bi) != WRITE)
3d310eb7 5161 return;
06d91a5f 5162
f91de92e
N		 5163 BUG_ON(mddev->ro == 1);
5164 if (mddev->ro == 2) {
5165 /* need to switch to read/write */
5166 mddev->ro = 0;
5167 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5168 md_wakeup_thread(mddev->thread);
5169 }
06d91a5f 5170 atomic_inc(&mddev->writes_pending);
06d91a5f 5171 if (mddev->in_sync) {
a9701a30 5172 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 5173 if (mddev->in_sync) {
5174 mddev->in_sync = 0;
850b2b42 5175 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3d310eb7
N		 5176 md_wakeup_thread(mddev->thread);
5177 }
a9701a30 5178 spin_unlock_irq(&mddev->write_lock);
06d91a5f 5179 }
850b2b42 5180 wait_event(mddev->sb_wait, mddev->flags==0);
1da177e4
LT		 5181}
5182
5183void md_write_end(mddev_t *mddev)
5184{
5185 if (atomic_dec_and_test(&mddev->writes_pending)) {
5186 if (mddev->safemode == 2)
5187 md_wakeup_thread(mddev->thread);
16f17b39 5188 else if (mddev->safemode_delay)
1da177e4
LT		 5189 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5190 }
5191}
5192
2a2275d6
N		 5193/* md_allow_write(mddev)
5194 * Calling this ensures that the array is marked 'active' so that writes
5195 * may proceed without blocking. It is important to call this before
5196 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5197 * Must be called with mddev_lock held.
5198 */
5199void md_allow_write(mddev_t *mddev)
5200{
5201 if (!mddev->pers)
5202 return;
5203 if (mddev->ro)
5204 return;
5205
5206 spin_lock_irq(&mddev->write_lock);
5207 if (mddev->in_sync) {
5208 mddev->in_sync = 0;
5209 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5210 if (mddev->safemode_delay &&
5211 mddev->safemode == 0)
5212 mddev->safemode = 1;
5213 spin_unlock_irq(&mddev->write_lock);
5214 md_update_sb(mddev, 0);
5215 } else
5216 spin_unlock_irq(&mddev->write_lock);
5217}
5218EXPORT_SYMBOL_GPL(md_allow_write);
5219
75c96f85 5220static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
1da177e4
LT		 5221
5222#define SYNC_MARKS 10
5223#define SYNC_MARK_STEP (3*HZ)
29269553 5224void md_do_sync(mddev_t *mddev)
1da177e4
LT		 5225{
5226 mddev_t *mddev2;
5227 unsigned int currspeed = 0,
5228 window;
57afd89f 5229 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 5230 unsigned long mark[SYNC_MARKS];
5231 sector_t mark_cnt[SYNC_MARKS];
5232 int last_mark,m;
5233 struct list_head *tmp;
5234 sector_t last_check;
57afd89f 5235 int skipped = 0;
5fd6c1dc
N		 5236 struct list_head *rtmp;
5237 mdk_rdev_t *rdev;
61df9d91 5238 char *desc;
1da177e4
LT		 5239
5240 /* just incase thread restarts... */
5241 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5242 return;
5fd6c1dc
N		 5243 if (mddev->ro) /* never try to sync a read-only array */
5244 return;
1da177e4 5245
61df9d91
N		 5246 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5247 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5248 desc = "data-check";
5249 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5250 desc = "requested-resync";
5251 else
5252 desc = "resync";
5253 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5254 desc = "reshape";
5255 else
5256 desc = "recovery";
5257
1da177e4
LT		 5258 /* we overload curr_resync somewhat here.
5259 * 0 == not engaged in resync at all
5260 * 2 == checking that there is no conflict with another sync
5261 * 1 == like 2, but have yielded to allow conflicting resync to
5262 * commense
5263 * other == active in resync - this many blocks
5264 *
5265 * Before starting a resync we must have set curr_resync to
5266 * 2, and then checked that every "conflicting" array has curr_resync
5267 * less than ours. When we find one that is the same or higher
5268 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5269 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5270 * This will mean we have to start checking from the beginning again.
5271 *
5272 */
5273
5274 do {
5275 mddev->curr_resync = 2;
5276
5277 try_again:
787453c2 5278 if (kthread_should_stop()) {
6985c43f 5279 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 5280 goto skip;
5281 }
5282 ITERATE_MDDEV(mddev2,tmp) {
1da177e4
LT		 5283 if (mddev2 == mddev)
5284 continue;
5285 if (mddev2->curr_resync &&
5286 match_mddev_units(mddev,mddev2)) {
5287 DEFINE_WAIT(wq);
5288 if (mddev < mddev2 && mddev->curr_resync == 2) {
5289 /* arbitrarily yield */
5290 mddev->curr_resync = 1;
5291 wake_up(&resync_wait);
5292 }
5293 if (mddev > mddev2 && mddev->curr_resync == 1)
5294 /* no need to wait here, we can wait the next
5295 * time 'round when curr_resync == 2
5296 */
5297 continue;
787453c2
N		 5298 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5299 if (!kthread_should_stop() &&
8712e553 5300 mddev2->curr_resync >= mddev->curr_resync) {
61df9d91
N		 5301 printk(KERN_INFO "md: delaying %s of %s"
5302 " until %s has finished (they"
1da177e4 5303 " share one or more physical units)\n",
61df9d91 5304 desc, mdname(mddev), mdname(mddev2));
1da177e4
LT		 5305 mddev_put(mddev2);
5306 schedule();
5307 finish_wait(&resync_wait, &wq);
5308 goto try_again;
5309 }
5310 finish_wait(&resync_wait, &wq);
5311 }
5312 }
5313 } while (mddev->curr_resync < 2);
5314
5fd6c1dc 5315 j = 0;
9d88883e 5316 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 5317 /* resync follows the size requested by the personality,
57afd89f 5318 * which defaults to physical size, but can be virtual size
1da177e4
LT		 5319 */
5320 max_sectors = mddev->resync_max_sectors;
9d88883e 5321 mddev->resync_mismatches = 0;
5fd6c1dc
N		 5322 /* we don't use the checkpoint if there's a bitmap */
5323 if (!mddev->bitmap &&
5324 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5325 j = mddev->recovery_cp;
ccfcc3c1
N		 5326 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5327 max_sectors = mddev->size << 1;
5fd6c1dc 5328 else {
1da177e4
LT		 5329 /* recovery follows the physical size of devices */
5330 max_sectors = mddev->size << 1;
5fd6c1dc
N		 5331 j = MaxSector;
5332 ITERATE_RDEV(mddev,rdev,rtmp)
5333 if (rdev->raid_disk >= 0 &&
5334 !test_bit(Faulty, &rdev->flags) &&
5335 !test_bit(In_sync, &rdev->flags) &&
5336 rdev->recovery_offset < j)
5337 j = rdev->recovery_offset;
5338 }
1da177e4 5339
61df9d91
N		 5340 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5341 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5342 " %d KB/sec/disk.\n", speed_min(mddev));
338cec32 5343 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
61df9d91
N		 5344 "(but not more than %d KB/sec) for %s.\n",
5345 speed_max(mddev), desc);
1da177e4
LT		 5346
5347 is_mddev_idle(mddev); /* this also initializes IO event counters */
5fd6c1dc 5348
57afd89f 5349 io_sectors = 0;
1da177e4
LT		 5350 for (m = 0; m < SYNC_MARKS; m++) {
5351 mark[m] = jiffies;
57afd89f 5352 mark_cnt[m] = io_sectors;
1da177e4
LT		 5353 }
5354 last_mark = 0;
5355 mddev->resync_mark = mark[last_mark];
5356 mddev->resync_mark_cnt = mark_cnt[last_mark];
5357
5358 /*
5359 * Tune reconstruction:
5360 */
5361 window = 32*(PAGE_SIZE/512);
5362 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5363 window/2,(unsigned long long) max_sectors/2);
5364
5365 atomic_set(&mddev->recovery_active, 0);
5366 init_waitqueue_head(&mddev->recovery_wait);
5367 last_check = 0;
5368
5369 if (j>2) {
5370 printk(KERN_INFO
61df9d91
N		 5371 "md: resuming %s of %s from checkpoint.\n",
5372 desc, mdname(mddev));
1da177e4
LT		 5373 mddev->curr_resync = j;
5374 }
5375
5376 while (j < max_sectors) {
57afd89f 5377 sector_t sectors;
1da177e4 5378
57afd89f
N		 5379 skipped = 0;
5380 sectors = mddev->pers->sync_request(mddev, j, &skipped,
88202a0c 5381 currspeed < speed_min(mddev));
57afd89f 5382 if (sectors == 0) {
1da177e4
LT		 5383 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5384 goto out;
5385 }
57afd89f
N		 5386
5387 if (!skipped) { /* actual IO requested */
5388 io_sectors += sectors;
5389 atomic_add(sectors, &mddev->recovery_active);
5390 }
5391
1da177e4
LT		 5392 j += sectors;
5393 if (j>1) mddev->curr_resync = j;
ff4e8d9a 5394 mddev->curr_mark_cnt = io_sectors;
d7603b7e
N		 5395 if (last_check == 0)
5396 /* this is the earliers that rebuilt will be
5397 * visible in /proc/mdstat
5398 */
5399 md_new_event(mddev);
57afd89f
N		 5400
5401 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 5402 continue;
5403
57afd89f 5404 last_check = io_sectors;
1da177e4
LT		 5405
5406 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
5407 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
5408 break;
5409
5410 repeat:
5411 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5412 /* step marks */
5413 int next = (last_mark+1) % SYNC_MARKS;
5414
5415 mddev->resync_mark = mark[next];
5416 mddev->resync_mark_cnt = mark_cnt[next];
5417 mark[next] = jiffies;
57afd89f 5418 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 5419 last_mark = next;
5420 }
5421
5422
787453c2 5423 if (kthread_should_stop()) {
1da177e4
LT		 5424 /*
5425 * got a signal, exit.
5426 */
5427 printk(KERN_INFO
5428 "md: md_do_sync() got signal ... exiting\n");
1da177e4
LT		 5429 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5430 goto out;
5431 }
5432
5433 /*
5434 * this loop exits only if either when we are slower than
5435 * the 'hard' speed limit, or the system was IO-idle for
5436 * a jiffy.
5437 * the system might be non-idle CPU-wise, but we only care
5438 * about not overloading the IO subsystem. (things like an
5439 * e2fsck being done on the RAID array should execute fast)
5440 */
5441 mddev->queue->unplug_fn(mddev->queue);
5442 cond_resched();
5443
57afd89f
N		 5444 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5445 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4 5446
88202a0c
N		 5447 if (currspeed > speed_min(mddev)) {
5448 if ((currspeed > speed_max(mddev)) ||
1da177e4 5449 !is_mddev_idle(mddev)) {
c0e48521 5450 msleep(500);
1da177e4
LT		 5451 goto repeat;
5452 }
5453 }
5454 }
61df9d91 5455 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
1da177e4
LT		 5456 /*
5457 * this also signals 'finished resyncing' to md_stop
5458 */
5459 out:
5460 mddev->queue->unplug_fn(mddev->queue);
5461
5462 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5463
5464 /* tell personality that we are finished */
57afd89f 5465 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 5466
5467 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
ccfcc3c1 5468 !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5fd6c1dc
N		 5469 mddev->curr_resync > 2) {
5470 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5471 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5472 if (mddev->curr_resync >= mddev->recovery_cp) {
5473 printk(KERN_INFO
61df9d91
N		 5474 "md: checkpointing %s of %s.\n",
5475 desc, mdname(mddev));
5fd6c1dc
N		 5476 mddev->recovery_cp = mddev->curr_resync;
5477 }
5478 } else
5479 mddev->recovery_cp = MaxSector;
5480 } else {
5481 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5482 mddev->curr_resync = MaxSector;
5483 ITERATE_RDEV(mddev,rdev,rtmp)
5484 if (rdev->raid_disk >= 0 &&
5485 !test_bit(Faulty, &rdev->flags) &&
5486 !test_bit(In_sync, &rdev->flags) &&
5487 rdev->recovery_offset < mddev->curr_resync)
5488 rdev->recovery_offset = mddev->curr_resync;
5fd6c1dc 5489 }
1da177e4 5490 }
17571284 5491 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 5492
1da177e4
LT		 5493 skip:
5494 mddev->curr_resync = 0;
5495 wake_up(&resync_wait);
5496 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5497 md_wakeup_thread(mddev->thread);
5498}
29269553 5499EXPORT_SYMBOL_GPL(md_do_sync);
1da177e4
LT		 5500
5501
b4c4c7b8
N		 5502static int remove_and_add_spares(mddev_t *mddev)
5503{
5504 mdk_rdev_t *rdev;
5505 struct list_head *rtmp;
5506 int spares = 0;
5507
5508 ITERATE_RDEV(mddev,rdev,rtmp)
5509 if (rdev->raid_disk >= 0 &&
5510 (test_bit(Faulty, &rdev->flags) ||
5511 ! test_bit(In_sync, &rdev->flags)) &&
5512 atomic_read(&rdev->nr_pending)==0) {
5513 if (mddev->pers->hot_remove_disk(
5514 mddev, rdev->raid_disk)==0) {
5515 char nm[20];
5516 sprintf(nm,"rd%d", rdev->raid_disk);
5517 sysfs_remove_link(&mddev->kobj, nm);
5518 rdev->raid_disk = -1;
5519 }
5520 }
5521
5522 if (mddev->degraded) {
5523 ITERATE_RDEV(mddev,rdev,rtmp)
5524 if (rdev->raid_disk < 0
5525 && !test_bit(Faulty, &rdev->flags)) {
5526 rdev->recovery_offset = 0;
5527 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5528 char nm[20];
5529 sprintf(nm, "rd%d", rdev->raid_disk);
5e55e2f5
N		 5530 if (sysfs_create_link(&mddev->kobj,
5531 &rdev->kobj, nm))
5532 printk(KERN_WARNING
5533 "md: cannot register "
5534 "%s for %s\n",
5535 nm, mdname(mddev));
b4c4c7b8
N		 5536 spares++;
5537 md_new_event(mddev);
5538 } else
5539 break;
5540 }
5541 }
5542 return spares;
5543}
1da177e4
LT		 5544/*
5545 * This routine is regularly called by all per-raid-array threads to
5546 * deal with generic issues like resync and super-block update.
5547 * Raid personalities that don't have a thread (linear/raid0) do not
5548 * need this as they never do any recovery or update the superblock.
5549 *
5550 * It does not do any resync itself, but rather "forks" off other threads
5551 * to do that as needed.
5552 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5553 * "->recovery" and create a thread at ->sync_thread.
5554 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5555 * and wakeups up this thread which will reap the thread and finish up.
5556 * This thread also removes any faulty devices (with nr_pending == 0).
5557 *
5558 * The overall approach is:
5559 * 1/ if the superblock needs updating, update it.
5560 * 2/ If a recovery thread is running, don't do anything else.
5561 * 3/ If recovery has finished, clean up, possibly marking spares active.
5562 * 4/ If there are any faulty devices, remove them.
5563 * 5/ If array is degraded, try to add spares devices
5564 * 6/ If array has spares or is not in-sync, start a resync thread.
5565 */
5566void md_check_recovery(mddev_t *mddev)
5567{
5568 mdk_rdev_t *rdev;
5569 struct list_head *rtmp;
5570
5571
5f40402d
N		 5572 if (mddev->bitmap)
5573 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 5574
5575 if (mddev->ro)
5576 return;
fca4d848
N		 5577
5578 if (signal_pending(current)) {
5579 if (mddev->pers->sync_request) {
5580 printk(KERN_INFO "md: %s in immediate safe mode\n",
5581 mdname(mddev));
5582 mddev->safemode = 2;
5583 }
5584 flush_signals(current);
5585 }
5586
1da177e4 5587 if ( ! (
850b2b42 5588 mddev->flags ||
1da177e4 5589 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848
N		 5590 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
5591 (mddev->safemode == 1) ||
5592 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5593 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 5594 ))
5595 return;
fca4d848 5596
df5b89b3 5597 if (mddev_trylock(mddev)) {
b4c4c7b8 5598 int spares = 0;
fca4d848 5599
a9701a30 5600 spin_lock_irq(&mddev->write_lock);
fca4d848
N		 5601 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
5602 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
5603 mddev->in_sync = 1;
850b2b42 5604 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
fca4d848
N		 5605 }
5606 if (mddev->safemode == 1)
5607 mddev->safemode = 0;
a9701a30 5608 spin_unlock_irq(&mddev->write_lock);
fca4d848 5609
850b2b42
N		 5610 if (mddev->flags)
5611 md_update_sb(mddev, 0);
06d91a5f 5612
06d91a5f 5613
1da177e4
LT		 5614 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
5615 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
5616 /* resync/recovery still happening */
5617 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5618 goto unlock;
5619 }
5620 if (mddev->sync_thread) {
5621 /* resync has finished, collect result */
5622 md_unregister_thread(mddev->sync_thread);
5623 mddev->sync_thread = NULL;
5624 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5625 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5626 /* success...*/
5627 /* activate any spares */
5628 mddev->pers->spare_active(mddev);
5629 }
850b2b42 5630 md_update_sb(mddev, 1);
41158c7e
N		 5631
5632 /* if array is no-longer degraded, then any saved_raid_disk
5633 * information must be scrapped
5634 */
5635 if (!mddev->degraded)
5636 ITERATE_RDEV(mddev,rdev,rtmp)
5637 rdev->saved_raid_disk = -1;
5638
1da177e4
LT		 5639 mddev->recovery = 0;
5640 /* flag recovery needed just to double check */
5641 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
d7603b7e 5642 md_new_event(mddev);
1da177e4
LT		 5643 goto unlock;
5644 }
24dd469d
N		 5645 /* Clear some bits that don't mean anything, but
5646 * might be left set
5647 */
5648 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5649 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
5650 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
5651 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4 5652
5fd6c1dc
N		 5653 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5654 goto unlock;
1da177e4
LT		 5655 /* no recovery is running.
5656 * remove any failed drives, then
5657 * add spares if possible.
5658 * Spare are also removed and re-added, to allow
5659 * the personality to fail the re-add.
5660 */
1da177e4 5661
b4c4c7b8
N		 5662 if (mddev->reshape_position != MaxSector) {
5663 if (mddev->pers->check_reshape(mddev) != 0)
5664 /* Cannot proceed */
5665 goto unlock;
5666 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
5667 } else if ((spares = remove_and_add_spares(mddev))) {
24dd469d
N		 5668 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5669 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5670 } else if (mddev->recovery_cp < MaxSector) {
5671 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5672 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5673 /* nothing to be done ... */
1da177e4 5674 goto unlock;
24dd469d 5675
1da177e4
LT		 5676 if (mddev->pers->sync_request) {
5677 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 5678 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
5679 /* We are adding a device or devices to an array
5680 * which has the bitmap stored on all devices.
5681 * So make sure all bitmap pages get written
5682 */
5683 bitmap_write_all(mddev->bitmap);
5684 }
1da177e4
LT		 5685 mddev->sync_thread = md_register_thread(md_do_sync,
5686 mddev,
5687 "%s_resync");
5688 if (!mddev->sync_thread) {
5689 printk(KERN_ERR "%s: could not start resync"
5690 " thread...\n",
5691 mdname(mddev));
5692 /* leave the spares where they are, it shouldn't hurt */
5693 mddev->recovery = 0;
d7603b7e 5694 } else
1da177e4 5695 md_wakeup_thread(mddev->sync_thread);
d7603b7e 5696 md_new_event(mddev);
1da177e4
LT		 5697 }
5698 unlock:
5699 mddev_unlock(mddev);
5700 }
5701}
5702
75c96f85
AB		 5703static int md_notify_reboot(struct notifier_block *this,
5704 unsigned long code, void *x)
1da177e4
LT		 5705{
5706 struct list_head *tmp;
5707 mddev_t *mddev;
5708
5709 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
5710
5711 printk(KERN_INFO "md: stopping all md devices.\n");
5712
5713 ITERATE_MDDEV(mddev,tmp)
c71d4887 5714 if (mddev_trylock(mddev)) {
1da177e4 5715 do_md_stop (mddev, 1);
c71d4887
NB		 5716 mddev_unlock(mddev);
5717 }
1da177e4
LT		 5718 /*
5719 * certain more exotic SCSI devices are known to be
5720 * volatile wrt too early system reboots. While the
5721 * right place to handle this issue is the given
5722 * driver, we do want to have a safe RAID driver ...
5723 */
5724 mdelay(1000*1);
5725 }
5726 return NOTIFY_DONE;
5727}
5728
75c96f85 5729static struct notifier_block md_notifier = {
1da177e4
LT		 5730 .notifier_call = md_notify_reboot,
5731 .next = NULL,
5732 .priority = INT_MAX, /* before any real devices */
5733};
5734
5735static void md_geninit(void)
5736{
5737 struct proc_dir_entry *p;
5738
5739 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5740
5741 p = create_proc_entry("mdstat", S_IRUGO, NULL);
5742 if (p)
5743 p->proc_fops = &md_seq_fops;
5744}
5745
75c96f85 5746static int __init md_init(void)
1da177e4 5747{
1da177e4
LT		 5748 if (register_blkdev(MAJOR_NR, "md"))
5749 return -1;
5750 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
5751 unregister_blkdev(MAJOR_NR, "md");
5752 return -1;
5753 }
e8703fe1
N		 5754 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
5755 md_probe, NULL, NULL);
5756 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
1da177e4
LT		 5757 md_probe, NULL, NULL);
5758
1da177e4 5759 register_reboot_notifier(&md_notifier);
0b4d4147 5760 raid_table_header = register_sysctl_table(raid_root_table);
1da177e4
LT		 5761
5762 md_geninit();
5763 return (0);
5764}
5765
5766
5767#ifndef MODULE
5768
5769/*
5770 * Searches all registered partitions for autorun RAID arrays
5771 * at boot time.
5772 */
4d936ec1
ME		 5773
5774static LIST_HEAD(all_detected_devices);
5775struct detected_devices_node {
5776 struct list_head list;
5777 dev_t dev;
5778};
1da177e4
LT		 5779
5780void md_autodetect_dev(dev_t dev)
5781{
4d936ec1
ME		 5782 struct detected_devices_node *node_detected_dev;
5783
5784 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
5785 if (node_detected_dev) {
5786 node_detected_dev->dev = dev;
5787 list_add_tail(&node_detected_dev->list, &all_detected_devices);
5788 } else {
5789 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
5790 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
5791 }
1da177e4
LT		 5792}
5793
5794
5795static void autostart_arrays(int part)
5796{
5797 mdk_rdev_t *rdev;
4d936ec1
ME		 5798 struct detected_devices_node *node_detected_dev;
5799 dev_t dev;
5800 int i_scanned, i_passed;
1da177e4 5801
4d936ec1
ME		 5802 i_scanned = 0;
5803 i_passed = 0;
1da177e4 5804
4d936ec1 5805 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
1da177e4 5806
4d936ec1
ME		 5807 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
5808 i_scanned++;
5809 node_detected_dev = list_entry(all_detected_devices.next,
5810 struct detected_devices_node, list);
5811 list_del(&node_detected_dev->list);
5812 dev = node_detected_dev->dev;
5813 kfree(node_detected_dev);
df968c4e 5814 rdev = md_import_device(dev,0, 90);
1da177e4
LT		 5815 if (IS_ERR(rdev))
5816 continue;
5817
b2d444d7 5818 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 5819 MD_BUG();
5820 continue;
5821 }
5822 list_add(&rdev->same_set, &pending_raid_disks);
4d936ec1 5823 i_passed++;
1da177e4 5824 }
4d936ec1
ME		 5825
5826 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
5827 i_scanned, i_passed);
1da177e4
LT		 5828
5829 autorun_devices(part);
5830}
5831
fdee8ae4 5832#endif /* !MODULE */
1da177e4
LT		 5833
5834static __exit void md_exit(void)
5835{
5836 mddev_t *mddev;
5837 struct list_head *tmp;
8ab5e4c1 5838
e8703fe1
N		 5839 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
5840 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
1da177e4
LT		 5841
5842 unregister_blkdev(MAJOR_NR,"md");
5843 unregister_blkdev(mdp_major, "mdp");
5844 unregister_reboot_notifier(&md_notifier);
5845 unregister_sysctl_table(raid_table_header);
5846 remove_proc_entry("mdstat", NULL);
5847 ITERATE_MDDEV(mddev,tmp) {
5848 struct gendisk *disk = mddev->gendisk;
5849 if (!disk)
5850 continue;
5851 export_array(mddev);
5852 del_gendisk(disk);
5853 put_disk(disk);
5854 mddev->gendisk = NULL;
5855 mddev_put(mddev);
5856 }
5857}
5858
685784aa 5859subsys_initcall(md_init);
1da177e4
LT		 5860module_exit(md_exit)
5861
f91de92e
N		 5862static int get_ro(char *buffer, struct kernel_param *kp)
5863{
5864 return sprintf(buffer, "%d", start_readonly);
5865}
5866static int set_ro(const char *val, struct kernel_param *kp)
5867{
5868 char *e;
5869 int num = simple_strtoul(val, &e, 10);
5870 if (*val && (*e == '\0' || *e == '\n')) {
5871 start_readonly = num;
4dbcdc75 5872 return 0;
f91de92e
N		 5873 }
5874 return -EINVAL;
5875}
5876
80ca3a44
N		 5877module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
5878module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6ff8d8ec 5879
f91de92e 5880
1da177e4
LT		 5881EXPORT_SYMBOL(register_md_personality);
5882EXPORT_SYMBOL(unregister_md_personality);
5883EXPORT_SYMBOL(md_error);
5884EXPORT_SYMBOL(md_done_sync);
5885EXPORT_SYMBOL(md_write_start);
5886EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 5887EXPORT_SYMBOL(md_register_thread);
5888EXPORT_SYMBOL(md_unregister_thread);
5889EXPORT_SYMBOL(md_wakeup_thread);
1da177e4
LT		 5890EXPORT_SYMBOL(md_check_recovery);
5891MODULE_LICENSE("GPL");
aa1595e9 5892MODULE_ALIAS("md");
72008652 5893MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
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