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Isolate the explicit usage of signal->pgrp
[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
d7f3d291
IP		 2836static ssize_t
2837degraded_show(mddev_t *mddev, char *page)
2838{
2839 return sprintf(page, "%d\n", mddev->degraded);
2840}
2841static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
88202a0c
N		 2842
2843static ssize_t
2844sync_speed_show(mddev_t *mddev, char *page)
2845{
2846 unsigned long resync, dt, db;
ff4e8d9a 2847 resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active));
88202a0c
N		 2848 dt = ((jiffies - mddev->resync_mark) / HZ);
2849 if (!dt) dt++;
2850 db = resync - (mddev->resync_mark_cnt);
2851 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2852}
2853
80ca3a44 2854static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
88202a0c
N		 2855
2856static ssize_t
2857sync_completed_show(mddev_t *mddev, char *page)
2858{
2859 unsigned long max_blocks, resync;
2860
2861 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2862 max_blocks = mddev->resync_max_sectors;
2863 else
2864 max_blocks = mddev->size << 1;
2865
2866 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2867 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2868}
2869
80ca3a44 2870static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
88202a0c 2871
e464eafd
N		 2872static ssize_t
2873suspend_lo_show(mddev_t *mddev, char *page)
2874{
2875 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
2876}
2877
2878static ssize_t
2879suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
2880{
2881 char *e;
2882 unsigned long long new = simple_strtoull(buf, &e, 10);
2883
2884 if (mddev->pers->quiesce == NULL)
2885 return -EINVAL;
2886 if (buf == e || (*e && *e != '\n'))
2887 return -EINVAL;
2888 if (new >= mddev->suspend_hi ||
2889 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
2890 mddev->suspend_lo = new;
2891 mddev->pers->quiesce(mddev, 2);
2892 return len;
2893 } else
2894 return -EINVAL;
2895}
2896static struct md_sysfs_entry md_suspend_lo =
2897__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
2898
2899
2900static ssize_t
2901suspend_hi_show(mddev_t *mddev, char *page)
2902{
2903 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
2904}
2905
2906static ssize_t
2907suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
2908{
2909 char *e;
2910 unsigned long long new = simple_strtoull(buf, &e, 10);
2911
2912 if (mddev->pers->quiesce == NULL)
2913 return -EINVAL;
2914 if (buf == e || (*e && *e != '\n'))
2915 return -EINVAL;
2916 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
2917 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
2918 mddev->suspend_hi = new;
2919 mddev->pers->quiesce(mddev, 1);
2920 mddev->pers->quiesce(mddev, 0);
2921 return len;
2922 } else
2923 return -EINVAL;
2924}
2925static struct md_sysfs_entry md_suspend_hi =
2926__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
2927
08a02ecd
N		 2928static ssize_t
2929reshape_position_show(mddev_t *mddev, char *page)
2930{
2931 if (mddev->reshape_position != MaxSector)
2932 return sprintf(page, "%llu\n",
2933 (unsigned long long)mddev->reshape_position);
2934 strcpy(page, "none\n");
2935 return 5;
2936}
2937
2938static ssize_t
2939reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
2940{
2941 char *e;
2942 unsigned long long new = simple_strtoull(buf, &e, 10);
2943 if (mddev->pers)
2944 return -EBUSY;
2945 if (buf == e || (*e && *e != '\n'))
2946 return -EINVAL;
2947 mddev->reshape_position = new;
2948 mddev->delta_disks = 0;
2949 mddev->new_level = mddev->level;
2950 mddev->new_layout = mddev->layout;
2951 mddev->new_chunk = mddev->chunk_size;
2952 return len;
2953}
2954
2955static struct md_sysfs_entry md_reshape_position =
2956__ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
2957 reshape_position_store);
2958
e464eafd 2959
eae1701f
N		 2960static struct attribute *md_default_attrs[] = {
2961 &md_level.attr,
d4dbd025 2962 &md_layout.attr,
eae1701f 2963 &md_raid_disks.attr,
3b34380a 2964 &md_chunk_size.attr,
a35b0d69 2965 &md_size.attr,
a94213b1 2966 &md_resync_start.attr,
8bb93aac 2967 &md_metadata.attr,
6d7ff738 2968 &md_new_device.attr,
16f17b39 2969 &md_safe_delay.attr,
9e653b63 2970 &md_array_state.attr,
08a02ecd 2971 &md_reshape_position.attr,
411036fa
N		 2972 NULL,
2973};
2974
2975static struct attribute *md_redundancy_attrs[] = {
24dd469d 2976 &md_scan_mode.attr,
9d88883e 2977 &md_mismatches.attr,
88202a0c
N		 2978 &md_sync_min.attr,
2979 &md_sync_max.attr,
2980 &md_sync_speed.attr,
2981 &md_sync_completed.attr,
e464eafd
N		 2982 &md_suspend_lo.attr,
2983 &md_suspend_hi.attr,
9b1d1dac 2984 &md_bitmap.attr,
d7f3d291 2985 &md_degraded.attr,
eae1701f
N		 2986 NULL,
2987};
411036fa
N		 2988static struct attribute_group md_redundancy_group = {
2989 .name = NULL,
2990 .attrs = md_redundancy_attrs,
2991};
2992
eae1701f
N		 2993
2994static ssize_t
2995md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2996{
2997 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2998 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2999 ssize_t rv;
eae1701f
N		 3000
3001 if (!entry->show)
3002 return -EIO;
5dc5cf7d
IM		 3003 rv = mddev_lock(mddev);
3004 if (!rv) {
3005 rv = entry->show(mddev, page);
3006 mddev_unlock(mddev);
3007 }
96de1e66 3008 return rv;
eae1701f
N		 3009}
3010
3011static ssize_t
3012md_attr_store(struct kobject *kobj, struct attribute *attr,
3013 const char *page, size_t length)
3014{
3015 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3016 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 3017 ssize_t rv;
eae1701f
N		 3018
3019 if (!entry->store)
3020 return -EIO;
67463acb
N		 3021 if (!capable(CAP_SYS_ADMIN))
3022 return -EACCES;
5dc5cf7d
IM		 3023 rv = mddev_lock(mddev);
3024 if (!rv) {
3025 rv = entry->store(mddev, page, length);
3026 mddev_unlock(mddev);
3027 }
96de1e66 3028 return rv;
eae1701f
N		 3029}
3030
3031static void md_free(struct kobject *ko)
3032{
3033 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3034 kfree(mddev);
3035}
3036
3037static struct sysfs_ops md_sysfs_ops = {
3038 .show = md_attr_show,
3039 .store = md_attr_store,
3040};
3041static struct kobj_type md_ktype = {
3042 .release = md_free,
3043 .sysfs_ops = &md_sysfs_ops,
3044 .default_attrs = md_default_attrs,
3045};
3046
1da177e4
LT		 3047int mdp_major = 0;
3048
3049static struct kobject *md_probe(dev_t dev, int *part, void *data)
3050{
48c9c27b 3051 static DEFINE_MUTEX(disks_mutex);
1da177e4
LT		 3052 mddev_t *mddev = mddev_find(dev);
3053 struct gendisk *disk;
3054 int partitioned = (MAJOR(dev) != MD_MAJOR);
3055 int shift = partitioned ? MdpMinorShift : 0;
3056 int unit = MINOR(dev) >> shift;
3057
3058 if (!mddev)
3059 return NULL;
3060
48c9c27b 3061 mutex_lock(&disks_mutex);
1da177e4 3062 if (mddev->gendisk) {
48c9c27b 3063 mutex_unlock(&disks_mutex);
1da177e4
LT		 3064 mddev_put(mddev);
3065 return NULL;
3066 }
3067 disk = alloc_disk(1 << shift);
3068 if (!disk) {
48c9c27b 3069 mutex_unlock(&disks_mutex);
1da177e4
LT		 3070 mddev_put(mddev);
3071 return NULL;
3072 }
3073 disk->major = MAJOR(dev);
3074 disk->first_minor = unit << shift;
ce7b0f46 3075 if (partitioned)
1da177e4 3076 sprintf(disk->disk_name, "md_d%d", unit);
ce7b0f46 3077 else
1da177e4 3078 sprintf(disk->disk_name, "md%d", unit);
1da177e4
LT		 3079 disk->fops = &md_fops;
3080 disk->private_data = mddev;
3081 disk->queue = mddev->queue;
3082 add_disk(disk);
3083 mddev->gendisk = disk;
48c9c27b 3084 mutex_unlock(&disks_mutex);
9c791977 3085 mddev->kobj.parent = &disk->kobj;
19c38de8 3086 kobject_set_name(&mddev->kobj, "%s", "md");
eae1701f 3087 mddev->kobj.ktype = &md_ktype;
5e55e2f5
N		 3088 if (kobject_register(&mddev->kobj))
3089 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3090 disk->disk_name);
1da177e4
LT		 3091 return NULL;
3092}
3093
1da177e4
LT		 3094static void md_safemode_timeout(unsigned long data)
3095{
3096 mddev_t *mddev = (mddev_t *) data;
3097
3098 mddev->safemode = 1;
3099 md_wakeup_thread(mddev->thread);
3100}
3101
6ff8d8ec 3102static int start_dirty_degraded;
1da177e4
LT		 3103
3104static int do_md_run(mddev_t * mddev)
3105{
2604b703 3106 int err;
1da177e4
LT		 3107 int chunk_size;
3108 struct list_head *tmp;
3109 mdk_rdev_t *rdev;
3110 struct gendisk *disk;
2604b703 3111 struct mdk_personality *pers;
1da177e4
LT		 3112 char b[BDEVNAME_SIZE];
3113
a757e64c
N		 3114 if (list_empty(&mddev->disks))
3115 /* cannot run an array with no devices.. */
1da177e4 3116 return -EINVAL;
1da177e4
LT		 3117
3118 if (mddev->pers)
3119 return -EBUSY;
3120
3121 /*
3122 * Analyze all RAID superblock(s)
3123 */
a757e64c
N		 3124 if (!mddev->raid_disks)
3125 analyze_sbs(mddev);
1da177e4
LT		 3126
3127 chunk_size = mddev->chunk_size;
2604b703
N		 3128
3129 if (chunk_size) {
1da177e4
LT		 3130 if (chunk_size > MAX_CHUNK_SIZE) {
3131 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3132 chunk_size, MAX_CHUNK_SIZE);
3133 return -EINVAL;
3134 }
3135 /*
3136 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3137 */
3138 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 3139 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 3140 return -EINVAL;
3141 }
3142 if (chunk_size < PAGE_SIZE) {
3143 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
3144 chunk_size, PAGE_SIZE);
3145 return -EINVAL;
3146 }
3147
3148 /* devices must have minimum size of one chunk */
3149 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 3150 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3151 continue;
3152 if (rdev->size < chunk_size / 1024) {
3153 printk(KERN_WARNING
3154 "md: Dev %s smaller than chunk_size:"
3155 " %lluk < %dk\n",
3156 bdevname(rdev->bdev,b),
3157 (unsigned long long)rdev->size,
3158 chunk_size / 1024);
3159 return -EINVAL;
3160 }
3161 }
3162 }
3163
1da177e4 3164#ifdef CONFIG_KMOD
d9d166c2
N		 3165 if (mddev->level != LEVEL_NONE)
3166 request_module("md-level-%d", mddev->level);
3167 else if (mddev->clevel[0])
3168 request_module("md-%s", mddev->clevel);
1da177e4
LT		 3169#endif
3170
3171 /*
3172 * Drop all container device buffers, from now on
3173 * the only valid external interface is through the md
3174 * device.
1da177e4
LT		 3175 */
3176 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 3177 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3178 continue;
3179 sync_blockdev(rdev->bdev);
f98393a6 3180 invalidate_bdev(rdev->bdev);
f0d76d70
N		 3181
3182 /* perform some consistency tests on the device.
3183 * We don't want the data to overlap the metadata,
3184 * Internal Bitmap issues has handled elsewhere.
3185 */
3186 if (rdev->data_offset < rdev->sb_offset) {
3187 if (mddev->size &&
3188 rdev->data_offset + mddev->size*2
3189 > rdev->sb_offset*2) {
3190 printk("md: %s: data overlaps metadata\n",
3191 mdname(mddev));
3192 return -EINVAL;
3193 }
3194 } else {
3195 if (rdev->sb_offset*2 + rdev->sb_size/512
3196 > rdev->data_offset) {
3197 printk("md: %s: metadata overlaps data\n",
3198 mdname(mddev));
3199 return -EINVAL;
3200 }
3201 }
1da177e4
LT		 3202 }
3203
3204 md_probe(mddev->unit, NULL, NULL);
3205 disk = mddev->gendisk;
3206 if (!disk)
3207 return -ENOMEM;
3208
3209 spin_lock(&pers_lock);
d9d166c2 3210 pers = find_pers(mddev->level, mddev->clevel);
2604b703 3211 if (!pers || !try_module_get(pers->owner)) {
1da177e4 3212 spin_unlock(&pers_lock);
d9d166c2
N		 3213 if (mddev->level != LEVEL_NONE)
3214 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3215 mddev->level);
3216 else
3217 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3218 mddev->clevel);
1da177e4
LT		 3219 return -EINVAL;
3220 }
2604b703 3221 mddev->pers = pers;
1da177e4 3222 spin_unlock(&pers_lock);
d9d166c2
N		 3223 mddev->level = pers->level;
3224 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
1da177e4 3225
f6705578 3226 if (mddev->reshape_position != MaxSector &&
63c70c4f 3227 pers->start_reshape == NULL) {
f6705578
N		 3228 /* This personality cannot handle reshaping... */
3229 mddev->pers = NULL;
3230 module_put(pers->owner);
3231 return -EINVAL;
3232 }
3233
7dd5e7c3
N		 3234 if (pers->sync_request) {
3235 /* Warn if this is a potentially silly
3236 * configuration.
3237 */
3238 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3239 mdk_rdev_t *rdev2;
3240 struct list_head *tmp2;
3241 int warned = 0;
3242 ITERATE_RDEV(mddev, rdev, tmp) {
3243 ITERATE_RDEV(mddev, rdev2, tmp2) {
3244 if (rdev < rdev2 &&
3245 rdev->bdev->bd_contains ==
3246 rdev2->bdev->bd_contains) {
3247 printk(KERN_WARNING
3248 "%s: WARNING: %s appears to be"
3249 " on the same physical disk as"
3250 " %s.\n",
3251 mdname(mddev),
3252 bdevname(rdev->bdev,b),
3253 bdevname(rdev2->bdev,b2));
3254 warned = 1;
3255 }
3256 }
3257 }
3258 if (warned)
3259 printk(KERN_WARNING
3260 "True protection against single-disk"
3261 " failure might be compromised.\n");
3262 }
3263
657390d2 3264 mddev->recovery = 0;
1da177e4 3265 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 3266 mddev->barriers_work = 1;
6ff8d8ec 3267 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 3268
f91de92e
N		 3269 if (start_readonly)
3270 mddev->ro = 2; /* read-only, but switch on first write */
3271
b15c2e57
N		 3272 err = mddev->pers->run(mddev);
3273 if (!err && mddev->pers->sync_request) {
3274 err = bitmap_create(mddev);
3275 if (err) {
3276 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3277 mdname(mddev), err);
3278 mddev->pers->stop(mddev);
3279 }
3280 }
1da177e4
LT		 3281 if (err) {
3282 printk(KERN_ERR "md: pers->run() failed ...\n");
3283 module_put(mddev->pers->owner);
3284 mddev->pers = NULL;
32a7627c
N		 3285 bitmap_destroy(mddev);
3286 return err;
1da177e4 3287 }
5e55e2f5
N		 3288 if (mddev->pers->sync_request) {
3289 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3290 printk(KERN_WARNING
3291 "md: cannot register extra attributes for %s\n",
3292 mdname(mddev));
3293 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
fd9d49ca
N		 3294 mddev->ro = 0;
3295
1da177e4
LT		 3296 atomic_set(&mddev->writes_pending,0);
3297 mddev->safemode = 0;
3298 mddev->safemode_timer.function = md_safemode_timeout;
3299 mddev->safemode_timer.data = (unsigned long) mddev;
16f17b39 3300 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
1da177e4 3301 mddev->in_sync = 1;
86e6ffdd
N		 3302
3303 ITERATE_RDEV(mddev,rdev,tmp)
3304 if (rdev->raid_disk >= 0) {
3305 char nm[20];
3306 sprintf(nm, "rd%d", rdev->raid_disk);
5e55e2f5
N		 3307 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3308 printk("md: cannot register %s for %s\n",
3309 nm, mdname(mddev));
86e6ffdd 3310 }
1da177e4
LT		 3311
3312 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3313
850b2b42
N		 3314 if (mddev->flags)
3315 md_update_sb(mddev, 0);
1da177e4
LT		 3316
3317 set_capacity(disk, mddev->array_size<<1);
3318
3319 /* If we call blk_queue_make_request here, it will
3320 * re-initialise max_sectors etc which may have been
3321 * refined inside -> run. So just set the bits we need to set.
3322 * Most initialisation happended when we called
3323 * blk_queue_make_request(..., md_fail_request)
3324 * earlier.
3325 */
3326 mddev->queue->queuedata = mddev;
3327 mddev->queue->make_request_fn = mddev->pers->make_request;
3328
5fd6c1dc
N		 3329 /* If there is a partially-recovered drive we need to
3330 * start recovery here. If we leave it to md_check_recovery,
3331 * it will remove the drives and not do the right thing
3332 */
0b8c9de0 3333 if (mddev->degraded && !mddev->sync_thread) {
5fd6c1dc
N		 3334 struct list_head *rtmp;
3335 int spares = 0;
3336 ITERATE_RDEV(mddev,rdev,rtmp)
3337 if (rdev->raid_disk >= 0 &&
3338 !test_bit(In_sync, &rdev->flags) &&
3339 !test_bit(Faulty, &rdev->flags))
3340 /* complete an interrupted recovery */
3341 spares++;
3342 if (spares && mddev->pers->sync_request) {
3343 mddev->recovery = 0;
3344 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3345 mddev->sync_thread = md_register_thread(md_do_sync,
3346 mddev,
3347 "%s_resync");
3348 if (!mddev->sync_thread) {
3349 printk(KERN_ERR "%s: could not start resync"
3350 " thread...\n",
3351 mdname(mddev));
3352 /* leave the spares where they are, it shouldn't hurt */
3353 mddev->recovery = 0;
0b8c9de0 3354 }
5fd6c1dc
N		 3355 }
3356 }
0b8c9de0
N		 3357 md_wakeup_thread(mddev->thread);
3358 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5fd6c1dc 3359
44ce6294 3360 mddev->changed = 1;
d7603b7e 3361 md_new_event(mddev);
2f471303 3362 kobject_uevent(&mddev->gendisk->kobj, KOBJ_CHANGE);
1da177e4
LT		 3363 return 0;
3364}
3365
3366static int restart_array(mddev_t *mddev)
3367{
3368 struct gendisk *disk = mddev->gendisk;
3369 int err;
3370
3371 /*
3372 * Complain if it has no devices
3373 */
3374 err = -ENXIO;
3375 if (list_empty(&mddev->disks))
3376 goto out;
3377
3378 if (mddev->pers) {
3379 err = -EBUSY;
3380 if (!mddev->ro)
3381 goto out;
3382
3383 mddev->safemode = 0;
3384 mddev->ro = 0;
3385 set_disk_ro(disk, 0);
3386
3387 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3388 mdname(mddev));
3389 /*
3390 * Kick recovery or resync if necessary
3391 */
3392 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3393 md_wakeup_thread(mddev->thread);
5fd6c1dc 3394 md_wakeup_thread(mddev->sync_thread);
1da177e4 3395 err = 0;
9e653b63 3396 } else
1da177e4 3397 err = -EINVAL;
1da177e4
LT		 3398
3399out:
3400 return err;
3401}
3402
acc55e22
N		 3403/* similar to deny_write_access, but accounts for our holding a reference
3404 * to the file ourselves */
3405static int deny_bitmap_write_access(struct file * file)
3406{
3407 struct inode *inode = file->f_mapping->host;
3408
3409 spin_lock(&inode->i_lock);
3410 if (atomic_read(&inode->i_writecount) > 1) {
3411 spin_unlock(&inode->i_lock);
3412 return -ETXTBSY;
3413 }
3414 atomic_set(&inode->i_writecount, -1);
3415 spin_unlock(&inode->i_lock);
3416
3417 return 0;
3418}
3419
3420static void restore_bitmap_write_access(struct file *file)
3421{
3422 struct inode *inode = file->f_mapping->host;
3423
3424 spin_lock(&inode->i_lock);
3425 atomic_set(&inode->i_writecount, 1);
3426 spin_unlock(&inode->i_lock);
3427}
3428
9e653b63
N		 3429/* mode:
3430 * 0 - completely stop and dis-assemble array
3431 * 1 - switch to readonly
3432 * 2 - stop but do not disassemble array
3433 */
3434static int do_md_stop(mddev_t * mddev, int mode)
1da177e4
LT		 3435{
3436 int err = 0;
3437 struct gendisk *disk = mddev->gendisk;
3438
3439 if (mddev->pers) {
3440 if (atomic_read(&mddev->active)>2) {
3441 printk("md: %s still in use.\n",mdname(mddev));
3442 return -EBUSY;
3443 }
3444
3445 if (mddev->sync_thread) {
5fd6c1dc 3446 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4
LT		 3447 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3448 md_unregister_thread(mddev->sync_thread);
3449 mddev->sync_thread = NULL;
3450 }
3451
3452 del_timer_sync(&mddev->safemode_timer);
3453
3454 invalidate_partition(disk, 0);
3455
9e653b63
N		 3456 switch(mode) {
3457 case 1: /* readonly */
1da177e4 3458 err = -ENXIO;
f91de92e 3459 if (mddev->ro==1)
1da177e4
LT		 3460 goto out;
3461 mddev->ro = 1;
9e653b63
N		 3462 break;
3463 case 0: /* disassemble */
3464 case 2: /* stop */
6b8b3e8a 3465 bitmap_flush(mddev);
a9701a30 3466 md_super_wait(mddev);
1da177e4
LT		 3467 if (mddev->ro)
3468 set_disk_ro(disk, 0);
3469 blk_queue_make_request(mddev->queue, md_fail_request);
3470 mddev->pers->stop(mddev);
d1b5380c
N		 3471 mddev->queue->merge_bvec_fn = NULL;
3472 mddev->queue->unplug_fn = NULL;
041ae52e 3473 mddev->queue->backing_dev_info.congested_fn = NULL;
411036fa
N		 3474 if (mddev->pers->sync_request)
3475 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3476
1da177e4
LT		 3477 module_put(mddev->pers->owner);
3478 mddev->pers = NULL;
0d4ca600
N		 3479
3480 set_capacity(disk, 0);
44ce6294 3481 mddev->changed = 1;
0d4ca600 3482
1da177e4
LT		 3483 if (mddev->ro)
3484 mddev->ro = 0;
3485 }
850b2b42 3486 if (!mddev->in_sync || mddev->flags) {
1da177e4
LT		 3487 /* mark array as shutdown cleanly */
3488 mddev->in_sync = 1;
850b2b42 3489 md_update_sb(mddev, 1);
1da177e4 3490 }
9e653b63 3491 if (mode == 1)
1da177e4 3492 set_disk_ro(disk, 1);
5fd6c1dc 3493 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4 3494 }
32a7627c 3495
1da177e4
LT		 3496 /*
3497 * Free resources if final stop
3498 */
9e653b63 3499 if (mode == 0) {
86e6ffdd
N		 3500 mdk_rdev_t *rdev;
3501 struct list_head *tmp;
0d4ca600 3502
1da177e4
LT		 3503 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3504
978f946b
N		 3505 bitmap_destroy(mddev);
3506 if (mddev->bitmap_file) {
acc55e22 3507 restore_bitmap_write_access(mddev->bitmap_file);
978f946b
N		 3508 fput(mddev->bitmap_file);
3509 mddev->bitmap_file = NULL;
3510 }
3511 mddev->bitmap_offset = 0;
3512
86e6ffdd
N		 3513 ITERATE_RDEV(mddev,rdev,tmp)
3514 if (rdev->raid_disk >= 0) {
3515 char nm[20];
3516 sprintf(nm, "rd%d", rdev->raid_disk);
3517 sysfs_remove_link(&mddev->kobj, nm);
3518 }
3519
5792a285
N		 3520 /* make sure all delayed_delete calls have finished */
3521 flush_scheduled_work();
3522
1da177e4
LT		 3523 export_array(mddev);
3524
3525 mddev->array_size = 0;
9e653b63
N		 3526 mddev->size = 0;
3527 mddev->raid_disks = 0;
a94213b1 3528 mddev->recovery_cp = 0;
08a02ecd 3529 mddev->reshape_position = MaxSector;
9e653b63 3530
a8a55c38 3531 } else if (mddev->pers)
1da177e4
LT		 3532 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3533 mdname(mddev));
3534 err = 0;
d7603b7e 3535 md_new_event(mddev);
1da177e4
LT		 3536out:
3537 return err;
3538}
3539
fdee8ae4 3540#ifndef MODULE
1da177e4
LT		 3541static void autorun_array(mddev_t *mddev)
3542{
3543 mdk_rdev_t *rdev;
3544 struct list_head *tmp;
3545 int err;
3546
a757e64c 3547 if (list_empty(&mddev->disks))
1da177e4 3548 return;
1da177e4
LT		 3549
3550 printk(KERN_INFO "md: running: ");
3551
3552 ITERATE_RDEV(mddev,rdev,tmp) {
3553 char b[BDEVNAME_SIZE];
3554 printk("<%s>", bdevname(rdev->bdev,b));
3555 }
3556 printk("\n");
3557
3558 err = do_md_run (mddev);
3559 if (err) {
3560 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3561 do_md_stop (mddev, 0);
3562 }
3563}
3564
3565/*
3566 * lets try to run arrays based on all disks that have arrived
3567 * until now. (those are in pending_raid_disks)
3568 *
3569 * the method: pick the first pending disk, collect all disks with
3570 * the same UUID, remove all from the pending list and put them into
3571 * the 'same_array' list. Then order this list based on superblock
3572 * update time (freshest comes first), kick out 'old' disks and
3573 * compare superblocks. If everything's fine then run it.
3574 *
3575 * If "unit" is allocated, then bump its reference count
3576 */
3577static void autorun_devices(int part)
3578{
1da177e4
LT		 3579 struct list_head *tmp;
3580 mdk_rdev_t *rdev0, *rdev;
3581 mddev_t *mddev;
3582 char b[BDEVNAME_SIZE];
3583
3584 printk(KERN_INFO "md: autorun ...\n");
3585 while (!list_empty(&pending_raid_disks)) {
e8703fe1 3586 int unit;
1da177e4 3587 dev_t dev;
ad01c9e3 3588 LIST_HEAD(candidates);
1da177e4
LT		 3589 rdev0 = list_entry(pending_raid_disks.next,
3590 mdk_rdev_t, same_set);
3591
3592 printk(KERN_INFO "md: considering %s ...\n",
3593 bdevname(rdev0->bdev,b));
3594 INIT_LIST_HEAD(&candidates);
3595 ITERATE_RDEV_PENDING(rdev,tmp)
3596 if (super_90_load(rdev, rdev0, 0) >= 0) {
3597 printk(KERN_INFO "md: adding %s ...\n",
3598 bdevname(rdev->bdev,b));
3599 list_move(&rdev->same_set, &candidates);
3600 }
3601 /*
3602 * now we have a set of devices, with all of them having
3603 * mostly sane superblocks. It's time to allocate the
3604 * mddev.
3605 */
e8703fe1
N		 3606 if (part) {
3607 dev = MKDEV(mdp_major,
3608 rdev0->preferred_minor << MdpMinorShift);
3609 unit = MINOR(dev) >> MdpMinorShift;
3610 } else {
3611 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3612 unit = MINOR(dev);
3613 }
3614 if (rdev0->preferred_minor != unit) {
1da177e4
LT		 3615 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3616 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3617 break;
3618 }
1da177e4
LT		 3619
3620 md_probe(dev, NULL, NULL);
3621 mddev = mddev_find(dev);
3622 if (!mddev) {
3623 printk(KERN_ERR
3624 "md: cannot allocate memory for md drive.\n");
3625 break;
3626 }
3627 if (mddev_lock(mddev))
3628 printk(KERN_WARNING "md: %s locked, cannot run\n",
3629 mdname(mddev));
3630 else if (mddev->raid_disks || mddev->major_version
3631 || !list_empty(&mddev->disks)) {
3632 printk(KERN_WARNING
3633 "md: %s already running, cannot run %s\n",
3634 mdname(mddev), bdevname(rdev0->bdev,b));
3635 mddev_unlock(mddev);
3636 } else {
3637 printk(KERN_INFO "md: created %s\n", mdname(mddev));
3638 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
3639 list_del_init(&rdev->same_set);
3640 if (bind_rdev_to_array(rdev, mddev))
3641 export_rdev(rdev);
3642 }
3643 autorun_array(mddev);
3644 mddev_unlock(mddev);
3645 }
3646 /* on success, candidates will be empty, on error
3647 * it won't...
3648 */
3649 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
3650 export_rdev(rdev);
3651 mddev_put(mddev);
3652 }
3653 printk(KERN_INFO "md: ... autorun DONE.\n");
3654}
fdee8ae4 3655#endif /* !MODULE */
1da177e4 3656
1da177e4
LT		 3657static int get_version(void __user * arg)
3658{
3659 mdu_version_t ver;
3660
3661 ver.major = MD_MAJOR_VERSION;
3662 ver.minor = MD_MINOR_VERSION;
3663 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3664
3665 if (copy_to_user(arg, &ver, sizeof(ver)))
3666 return -EFAULT;
3667
3668 return 0;
3669}
3670
3671static int get_array_info(mddev_t * mddev, void __user * arg)
3672{
3673 mdu_array_info_t info;
3674 int nr,working,active,failed,spare;
3675 mdk_rdev_t *rdev;
3676 struct list_head *tmp;
3677
3678 nr=working=active=failed=spare=0;
3679 ITERATE_RDEV(mddev,rdev,tmp) {
3680 nr++;
b2d444d7 3681 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3682 failed++;
3683 else {
3684 working++;
b2d444d7 3685 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 3686 active++;
3687 else
3688 spare++;
3689 }
3690 }
3691
3692 info.major_version = mddev->major_version;
3693 info.minor_version = mddev->minor_version;
3694 info.patch_version = MD_PATCHLEVEL_VERSION;
3695 info.ctime = mddev->ctime;
3696 info.level = mddev->level;
3697 info.size = mddev->size;
284ae7ca
N		 3698 if (info.size != mddev->size) /* overflow */
3699 info.size = -1;
1da177e4
LT		 3700 info.nr_disks = nr;
3701 info.raid_disks = mddev->raid_disks;
3702 info.md_minor = mddev->md_minor;
3703 info.not_persistent= !mddev->persistent;
3704
3705 info.utime = mddev->utime;
3706 info.state = 0;
3707 if (mddev->in_sync)
3708 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 3709 if (mddev->bitmap && mddev->bitmap_offset)
3710 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 3711 info.active_disks = active;
3712 info.working_disks = working;
3713 info.failed_disks = failed;
3714 info.spare_disks = spare;
3715
3716 info.layout = mddev->layout;
3717 info.chunk_size = mddev->chunk_size;
3718
3719 if (copy_to_user(arg, &info, sizeof(info)))
3720 return -EFAULT;
3721
3722 return 0;
3723}
3724
87162a28 3725static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 3726{
3727 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3728 char *ptr, *buf = NULL;
3729 int err = -ENOMEM;
3730
2a2275d6
N		 3731 md_allow_write(mddev);
3732
32a7627c
N		 3733 file = kmalloc(sizeof(*file), GFP_KERNEL);
3734 if (!file)
3735 goto out;
3736
3737 /* bitmap disabled, zero the first byte and copy out */
3738 if (!mddev->bitmap || !mddev->bitmap->file) {
3739 file->pathname[0] = '\0';
3740 goto copy_out;
3741 }
3742
3743 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3744 if (!buf)
3745 goto out;
3746
3747 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3748 if (!ptr)
3749 goto out;
3750
3751 strcpy(file->pathname, ptr);
3752
3753copy_out:
3754 err = 0;
3755 if (copy_to_user(arg, file, sizeof(*file)))
3756 err = -EFAULT;
3757out:
3758 kfree(buf);
3759 kfree(file);
3760 return err;
3761}
3762
1da177e4
LT		 3763static int get_disk_info(mddev_t * mddev, void __user * arg)
3764{
3765 mdu_disk_info_t info;
3766 unsigned int nr;
3767 mdk_rdev_t *rdev;
3768
3769 if (copy_from_user(&info, arg, sizeof(info)))
3770 return -EFAULT;
3771
3772 nr = info.number;
3773
3774 rdev = find_rdev_nr(mddev, nr);
3775 if (rdev) {
3776 info.major = MAJOR(rdev->bdev->bd_dev);
3777 info.minor = MINOR(rdev->bdev->bd_dev);
3778 info.raid_disk = rdev->raid_disk;
3779 info.state = 0;
b2d444d7 3780 if (test_bit(Faulty, &rdev->flags))
1da177e4 3781 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 3782 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 3783 info.state |= (1<<MD_DISK_ACTIVE);
3784 info.state |= (1<<MD_DISK_SYNC);
3785 }
8ddf9efe
N		 3786 if (test_bit(WriteMostly, &rdev->flags))
3787 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 3788 } else {
3789 info.major = info.minor = 0;
3790 info.raid_disk = -1;
3791 info.state = (1<<MD_DISK_REMOVED);
3792 }
3793
3794 if (copy_to_user(arg, &info, sizeof(info)))
3795 return -EFAULT;
3796
3797 return 0;
3798}
3799
3800static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3801{
3802 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3803 mdk_rdev_t *rdev;
3804 dev_t dev = MKDEV(info->major,info->minor);
3805
3806 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3807 return -EOVERFLOW;
3808
3809 if (!mddev->raid_disks) {
3810 int err;
3811 /* expecting a device which has a superblock */
3812 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3813 if (IS_ERR(rdev)) {
3814 printk(KERN_WARNING
3815 "md: md_import_device returned %ld\n",
3816 PTR_ERR(rdev));
3817 return PTR_ERR(rdev);
3818 }
3819 if (!list_empty(&mddev->disks)) {
3820 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3821 mdk_rdev_t, same_set);
3822 int err = super_types[mddev->major_version]
3823 .load_super(rdev, rdev0, mddev->minor_version);
3824 if (err < 0) {
3825 printk(KERN_WARNING
3826 "md: %s has different UUID to %s\n",
3827 bdevname(rdev->bdev,b),
3828 bdevname(rdev0->bdev,b2));
3829 export_rdev(rdev);
3830 return -EINVAL;
3831 }
3832 }
3833 err = bind_rdev_to_array(rdev, mddev);
3834 if (err)
3835 export_rdev(rdev);
3836 return err;
3837 }
3838
3839 /*
3840 * add_new_disk can be used once the array is assembled
3841 * to add "hot spares". They must already have a superblock
3842 * written
3843 */
3844 if (mddev->pers) {
3845 int err;
3846 if (!mddev->pers->hot_add_disk) {
3847 printk(KERN_WARNING
3848 "%s: personality does not support diskops!\n",
3849 mdname(mddev));
3850 return -EINVAL;
3851 }
7b1e35f6
N		 3852 if (mddev->persistent)
3853 rdev = md_import_device(dev, mddev->major_version,
3854 mddev->minor_version);
3855 else
3856 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 3857 if (IS_ERR(rdev)) {
3858 printk(KERN_WARNING
3859 "md: md_import_device returned %ld\n",
3860 PTR_ERR(rdev));
3861 return PTR_ERR(rdev);
3862 }
41158c7e
N		 3863 /* set save_raid_disk if appropriate */
3864 if (!mddev->persistent) {
3865 if (info->state & (1<<MD_DISK_SYNC) &&
3866 info->raid_disk < mddev->raid_disks)
3867 rdev->raid_disk = info->raid_disk;
3868 else
3869 rdev->raid_disk = -1;
3870 } else
3871 super_types[mddev->major_version].
3872 validate_super(mddev, rdev);
3873 rdev->saved_raid_disk = rdev->raid_disk;
3874
b2d444d7 3875 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 3876 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3877 set_bit(WriteMostly, &rdev->flags);
3878
1da177e4
LT		 3879 rdev->raid_disk = -1;
3880 err = bind_rdev_to_array(rdev, mddev);
7c7546cc
N		 3881 if (!err && !mddev->pers->hot_remove_disk) {
3882 /* If there is hot_add_disk but no hot_remove_disk
3883 * then added disks for geometry changes,
3884 * and should be added immediately.
3885 */
3886 super_types[mddev->major_version].
3887 validate_super(mddev, rdev);
3888 err = mddev->pers->hot_add_disk(mddev, rdev);
3889 if (err)
3890 unbind_rdev_from_array(rdev);
3891 }
1da177e4
LT		 3892 if (err)
3893 export_rdev(rdev);
c361777f 3894
17571284 3895 md_update_sb(mddev, 1);
c361777f 3896 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 3897 md_wakeup_thread(mddev->thread);
1da177e4
LT		 3898 return err;
3899 }
3900
3901 /* otherwise, add_new_disk is only allowed
3902 * for major_version==0 superblocks
3903 */
3904 if (mddev->major_version != 0) {
3905 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3906 mdname(mddev));
3907 return -EINVAL;
3908 }
3909
3910 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3911 int err;
3912 rdev = md_import_device (dev, -1, 0);
3913 if (IS_ERR(rdev)) {
3914 printk(KERN_WARNING
3915 "md: error, md_import_device() returned %ld\n",
3916 PTR_ERR(rdev));
3917 return PTR_ERR(rdev);
3918 }
3919 rdev->desc_nr = info->number;
3920 if (info->raid_disk < mddev->raid_disks)
3921 rdev->raid_disk = info->raid_disk;
3922 else
3923 rdev->raid_disk = -1;
3924
b2d444d7
N		 3925 rdev->flags = 0;
3926
1da177e4 3927 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 3928 if (info->state & (1<<MD_DISK_SYNC))
3929 set_bit(In_sync, &rdev->flags);
1da177e4 3930
8ddf9efe
N		 3931 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3932 set_bit(WriteMostly, &rdev->flags);
3933
1da177e4
LT		 3934 if (!mddev->persistent) {
3935 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3936 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3937 } else
3938 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3939 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3940
2bf071bf
N		 3941 err = bind_rdev_to_array(rdev, mddev);
3942 if (err) {
3943 export_rdev(rdev);
3944 return err;
3945 }
1da177e4
LT		 3946 }
3947
3948 return 0;
3949}
3950
3951static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3952{
3953 char b[BDEVNAME_SIZE];
3954 mdk_rdev_t *rdev;
3955
3956 if (!mddev->pers)
3957 return -ENODEV;
3958
3959 rdev = find_rdev(mddev, dev);
3960 if (!rdev)
3961 return -ENXIO;
3962
3963 if (rdev->raid_disk >= 0)
3964 goto busy;
3965
3966 kick_rdev_from_array(rdev);
850b2b42 3967 md_update_sb(mddev, 1);
d7603b7e 3968 md_new_event(mddev);
1da177e4
LT		 3969
3970 return 0;
3971busy:
3972 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3973 bdevname(rdev->bdev,b), mdname(mddev));
3974 return -EBUSY;
3975}
3976
3977static int hot_add_disk(mddev_t * mddev, dev_t dev)
3978{
3979 char b[BDEVNAME_SIZE];
3980 int err;
3981 unsigned int size;
3982 mdk_rdev_t *rdev;
3983
3984 if (!mddev->pers)
3985 return -ENODEV;
3986
3987 if (mddev->major_version != 0) {
3988 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3989 " version-0 superblocks.\n",
3990 mdname(mddev));
3991 return -EINVAL;
3992 }
3993 if (!mddev->pers->hot_add_disk) {
3994 printk(KERN_WARNING
3995 "%s: personality does not support diskops!\n",
3996 mdname(mddev));
3997 return -EINVAL;
3998 }
3999
4000 rdev = md_import_device (dev, -1, 0);
4001 if (IS_ERR(rdev)) {
4002 printk(KERN_WARNING
4003 "md: error, md_import_device() returned %ld\n",
4004 PTR_ERR(rdev));
4005 return -EINVAL;
4006 }
4007
4008 if (mddev->persistent)
4009 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
4010 else
4011 rdev->sb_offset =
4012 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4013
4014 size = calc_dev_size(rdev, mddev->chunk_size);
4015 rdev->size = size;
4016
b2d444d7 4017 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4018 printk(KERN_WARNING
4019 "md: can not hot-add faulty %s disk to %s!\n",
4020 bdevname(rdev->bdev,b), mdname(mddev));
4021 err = -EINVAL;
4022 goto abort_export;
4023 }
b2d444d7 4024 clear_bit(In_sync, &rdev->flags);
1da177e4 4025 rdev->desc_nr = -1;
5842730d 4026 rdev->saved_raid_disk = -1;
2bf071bf
N		 4027 err = bind_rdev_to_array(rdev, mddev);
4028 if (err)
4029 goto abort_export;
1da177e4
LT		 4030
4031 /*
4032 * The rest should better be atomic, we can have disk failures
4033 * noticed in interrupt contexts ...
4034 */
4035
4036 if (rdev->desc_nr == mddev->max_disks) {
4037 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
4038 mdname(mddev));
4039 err = -EBUSY;
4040 goto abort_unbind_export;
4041 }
4042
4043 rdev->raid_disk = -1;
4044
850b2b42 4045 md_update_sb(mddev, 1);
1da177e4
LT		 4046
4047 /*
4048 * Kick recovery, maybe this spare has to be added to the
4049 * array immediately.
4050 */
4051 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4052 md_wakeup_thread(mddev->thread);
d7603b7e 4053 md_new_event(mddev);
1da177e4
LT		 4054 return 0;
4055
4056abort_unbind_export:
4057 unbind_rdev_from_array(rdev);
4058
4059abort_export:
4060 export_rdev(rdev);
4061 return err;
4062}
4063
32a7627c
N		 4064static int set_bitmap_file(mddev_t *mddev, int fd)
4065{
4066 int err;
4067
36fa3063
N		 4068 if (mddev->pers) {
4069 if (!mddev->pers->quiesce)
4070 return -EBUSY;
4071 if (mddev->recovery || mddev->sync_thread)
4072 return -EBUSY;
4073 /* we should be able to change the bitmap.. */
4074 }
32a7627c 4075
32a7627c 4076
36fa3063
N		 4077 if (fd >= 0) {
4078 if (mddev->bitmap)
4079 return -EEXIST; /* cannot add when bitmap is present */
4080 mddev->bitmap_file = fget(fd);
32a7627c 4081
36fa3063
N		 4082 if (mddev->bitmap_file == NULL) {
4083 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4084 mdname(mddev));
4085 return -EBADF;
4086 }
4087
4088 err = deny_bitmap_write_access(mddev->bitmap_file);
4089 if (err) {
4090 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4091 mdname(mddev));
4092 fput(mddev->bitmap_file);
4093 mddev->bitmap_file = NULL;
4094 return err;
4095 }
a654b9d8 4096 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 4097 } else if (mddev->bitmap == NULL)
4098 return -ENOENT; /* cannot remove what isn't there */
4099 err = 0;
4100 if (mddev->pers) {
4101 mddev->pers->quiesce(mddev, 1);
4102 if (fd >= 0)
4103 err = bitmap_create(mddev);
d7375ab3 4104 if (fd < 0 || err) {
36fa3063 4105 bitmap_destroy(mddev);
d7375ab3
N		 4106 fd = -1; /* make sure to put the file */
4107 }
36fa3063 4108 mddev->pers->quiesce(mddev, 0);
d7375ab3
N		 4109 }
4110 if (fd < 0) {
acc55e22
N		 4111 if (mddev->bitmap_file) {
4112 restore_bitmap_write_access(mddev->bitmap_file);
36fa3063 4113 fput(mddev->bitmap_file);
acc55e22 4114 }
36fa3063
N		 4115 mddev->bitmap_file = NULL;
4116 }
4117
32a7627c
N		 4118 return err;
4119}
4120
1da177e4
LT		 4121/*
4122 * set_array_info is used two different ways
4123 * The original usage is when creating a new array.
4124 * In this usage, raid_disks is > 0 and it together with
4125 * level, size, not_persistent,layout,chunksize determine the
4126 * shape of the array.
4127 * This will always create an array with a type-0.90.0 superblock.
4128 * The newer usage is when assembling an array.
4129 * In this case raid_disks will be 0, and the major_version field is
4130 * use to determine which style super-blocks are to be found on the devices.
4131 * The minor and patch _version numbers are also kept incase the
4132 * super_block handler wishes to interpret them.
4133 */
4134static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4135{
4136
4137 if (info->raid_disks == 0) {
4138 /* just setting version number for superblock loading */
4139 if (info->major_version < 0 ||
50511da3 4140 info->major_version >= ARRAY_SIZE(super_types) ||
1da177e4
LT		 4141 super_types[info->major_version].name == NULL) {
4142 /* maybe try to auto-load a module? */
4143 printk(KERN_INFO
4144 "md: superblock version %d not known\n",
4145 info->major_version);
4146 return -EINVAL;
4147 }
4148 mddev->major_version = info->major_version;
4149 mddev->minor_version = info->minor_version;
4150 mddev->patch_version = info->patch_version;
3f9d7b0d 4151 mddev->persistent = !info->not_persistent;
1da177e4
LT		 4152 return 0;
4153 }
4154 mddev->major_version = MD_MAJOR_VERSION;
4155 mddev->minor_version = MD_MINOR_VERSION;
4156 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4157 mddev->ctime = get_seconds();
4158
4159 mddev->level = info->level;
17115e03 4160 mddev->clevel[0] = 0;
1da177e4
LT		 4161 mddev->size = info->size;
4162 mddev->raid_disks = info->raid_disks;
4163 /* don't set md_minor, it is determined by which /dev/md* was
4164 * openned
4165 */
4166 if (info->state & (1<<MD_SB_CLEAN))
4167 mddev->recovery_cp = MaxSector;
4168 else
4169 mddev->recovery_cp = 0;
4170 mddev->persistent = ! info->not_persistent;
4171
4172 mddev->layout = info->layout;
4173 mddev->chunk_size = info->chunk_size;
4174
4175 mddev->max_disks = MD_SB_DISKS;
4176
850b2b42
N		 4177 mddev->flags = 0;
4178 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 4179
b2a2703c
N		 4180 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4181 mddev->bitmap_offset = 0;
4182
f6705578
N		 4183 mddev->reshape_position = MaxSector;
4184
1da177e4
LT		 4185 /*
4186 * Generate a 128 bit UUID
4187 */
4188 get_random_bytes(mddev->uuid, 16);
4189
f6705578
N		 4190 mddev->new_level = mddev->level;
4191 mddev->new_chunk = mddev->chunk_size;
4192 mddev->new_layout = mddev->layout;
4193 mddev->delta_disks = 0;
4194
1da177e4
LT		 4195 return 0;
4196}
4197
a35b0d69
N		 4198static int update_size(mddev_t *mddev, unsigned long size)
4199{
4200 mdk_rdev_t * rdev;
4201 int rv;
4202 struct list_head *tmp;
8ddeeae5 4203 int fit = (size == 0);
a35b0d69
N		 4204
4205 if (mddev->pers->resize == NULL)
4206 return -EINVAL;
4207 /* The "size" is the amount of each device that is used.
4208 * This can only make sense for arrays with redundancy.
4209 * linear and raid0 always use whatever space is available
4210 * We can only consider changing the size if no resync
4211 * or reconstruction is happening, and if the new size
4212 * is acceptable. It must fit before the sb_offset or,
4213 * if that is <data_offset, it must fit before the
4214 * size of each device.
4215 * If size is zero, we find the largest size that fits.
4216 */
4217 if (mddev->sync_thread)
4218 return -EBUSY;
4219 ITERATE_RDEV(mddev,rdev,tmp) {
4220 sector_t avail;
01ab5662
N		 4221 avail = rdev->size * 2;
4222
a35b0d69
N		 4223 if (fit && (size == 0 || size > avail/2))
4224 size = avail/2;
4225 if (avail < ((sector_t)size << 1))
4226 return -ENOSPC;
4227 }
4228 rv = mddev->pers->resize(mddev, (sector_t)size *2);
4229 if (!rv) {
4230 struct block_device *bdev;
4231
4232 bdev = bdget_disk(mddev->gendisk, 0);
4233 if (bdev) {
1b1dcc1b 4234 mutex_lock(&bdev->bd_inode->i_mutex);
6d89332b 4235 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
1b1dcc1b 4236 mutex_unlock(&bdev->bd_inode->i_mutex);
a35b0d69
N		 4237 bdput(bdev);
4238 }
4239 }
4240 return rv;
4241}
4242
da943b99
N		 4243static int update_raid_disks(mddev_t *mddev, int raid_disks)
4244{
4245 int rv;
4246 /* change the number of raid disks */
63c70c4f 4247 if (mddev->pers->check_reshape == NULL)
da943b99
N		 4248 return -EINVAL;
4249 if (raid_disks <= 0 ||
4250 raid_disks >= mddev->max_disks)
4251 return -EINVAL;
63c70c4f 4252 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
da943b99 4253 return -EBUSY;
63c70c4f
N		 4254 mddev->delta_disks = raid_disks - mddev->raid_disks;
4255
4256 rv = mddev->pers->check_reshape(mddev);
da943b99
N		 4257 return rv;
4258}
4259
4260
1da177e4
LT		 4261/*
4262 * update_array_info is used to change the configuration of an
4263 * on-line array.
4264 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4265 * fields in the info are checked against the array.
4266 * Any differences that cannot be handled will cause an error.
4267 * Normally, only one change can be managed at a time.
4268 */
4269static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4270{
4271 int rv = 0;
4272 int cnt = 0;
36fa3063
N		 4273 int state = 0;
4274
4275 /* calculate expected state,ignoring low bits */
4276 if (mddev->bitmap && mddev->bitmap_offset)
4277 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 4278
4279 if (mddev->major_version != info->major_version ||
4280 mddev->minor_version != info->minor_version ||
4281/* mddev->patch_version != info->patch_version || */
4282 mddev->ctime != info->ctime ||
4283 mddev->level != info->level ||
4284/* mddev->layout != info->layout || */
4285 !mddev->persistent != info->not_persistent||
36fa3063
N		 4286 mddev->chunk_size != info->chunk_size ||
4287 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4288 ((state^info->state) & 0xfffffe00)
4289 )
1da177e4
LT		 4290 return -EINVAL;
4291 /* Check there is only one change */
284ae7ca 4292 if (info->size >= 0 && mddev->size != info->size) cnt++;
1da177e4
LT		 4293 if (mddev->raid_disks != info->raid_disks) cnt++;
4294 if (mddev->layout != info->layout) cnt++;
36fa3063 4295 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 4296 if (cnt == 0) return 0;
4297 if (cnt > 1) return -EINVAL;
4298
4299 if (mddev->layout != info->layout) {
4300 /* Change layout
4301 * we don't need to do anything at the md level, the
4302 * personality will take care of it all.
4303 */
4304 if (mddev->pers->reconfig == NULL)
4305 return -EINVAL;
4306 else
4307 return mddev->pers->reconfig(mddev, info->layout, -1);
4308 }
284ae7ca 4309 if (info->size >= 0 && mddev->size != info->size)
a35b0d69
N		 4310 rv = update_size(mddev, info->size);
4311
da943b99
N		 4312 if (mddev->raid_disks != info->raid_disks)
4313 rv = update_raid_disks(mddev, info->raid_disks);
4314
36fa3063
N		 4315 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4316 if (mddev->pers->quiesce == NULL)
4317 return -EINVAL;
4318 if (mddev->recovery || mddev->sync_thread)
4319 return -EBUSY;
4320 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4321 /* add the bitmap */
4322 if (mddev->bitmap)
4323 return -EEXIST;
4324 if (mddev->default_bitmap_offset == 0)
4325 return -EINVAL;
4326 mddev->bitmap_offset = mddev->default_bitmap_offset;
4327 mddev->pers->quiesce(mddev, 1);
4328 rv = bitmap_create(mddev);
4329 if (rv)
4330 bitmap_destroy(mddev);
4331 mddev->pers->quiesce(mddev, 0);
4332 } else {
4333 /* remove the bitmap */
4334 if (!mddev->bitmap)
4335 return -ENOENT;
4336 if (mddev->bitmap->file)
4337 return -EINVAL;
4338 mddev->pers->quiesce(mddev, 1);
4339 bitmap_destroy(mddev);
4340 mddev->pers->quiesce(mddev, 0);
4341 mddev->bitmap_offset = 0;
4342 }
4343 }
850b2b42 4344 md_update_sb(mddev, 1);
1da177e4
LT		 4345 return rv;
4346}
4347
4348static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4349{
4350 mdk_rdev_t *rdev;
4351
4352 if (mddev->pers == NULL)
4353 return -ENODEV;
4354
4355 rdev = find_rdev(mddev, dev);
4356 if (!rdev)
4357 return -ENODEV;
4358
4359 md_error(mddev, rdev);
4360 return 0;
4361}
4362
a885c8c4
CH		 4363static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4364{
4365 mddev_t *mddev = bdev->bd_disk->private_data;
4366
4367 geo->heads = 2;
4368 geo->sectors = 4;
4369 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4370 return 0;
4371}
4372
1da177e4
LT		 4373static int md_ioctl(struct inode *inode, struct file *file,
4374 unsigned int cmd, unsigned long arg)
4375{
4376 int err = 0;
4377 void __user *argp = (void __user *)arg;
1da177e4
LT		 4378 mddev_t *mddev = NULL;
4379
4380 if (!capable(CAP_SYS_ADMIN))
4381 return -EACCES;
4382
4383 /*
4384 * Commands dealing with the RAID driver but not any
4385 * particular array:
4386 */
4387 switch (cmd)
4388 {
4389 case RAID_VERSION:
4390 err = get_version(argp);
4391 goto done;
4392
4393 case PRINT_RAID_DEBUG:
4394 err = 0;
4395 md_print_devices();
4396 goto done;
4397
4398#ifndef MODULE
4399 case RAID_AUTORUN:
4400 err = 0;
4401 autostart_arrays(arg);
4402 goto done;
4403#endif
4404 default:;
4405 }
4406
4407 /*
4408 * Commands creating/starting a new array:
4409 */
4410
4411 mddev = inode->i_bdev->bd_disk->private_data;
4412
4413 if (!mddev) {
4414 BUG();
4415 goto abort;
4416 }
4417
1da177e4
LT		 4418 err = mddev_lock(mddev);
4419 if (err) {
4420 printk(KERN_INFO
4421 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4422 err, cmd);
4423 goto abort;
4424 }
4425
4426 switch (cmd)
4427 {
4428 case SET_ARRAY_INFO:
4429 {
4430 mdu_array_info_t info;
4431 if (!arg)
4432 memset(&info, 0, sizeof(info));
4433 else if (copy_from_user(&info, argp, sizeof(info))) {
4434 err = -EFAULT;
4435 goto abort_unlock;
4436 }
4437 if (mddev->pers) {
4438 err = update_array_info(mddev, &info);
4439 if (err) {
4440 printk(KERN_WARNING "md: couldn't update"
4441 " array info. %d\n", err);
4442 goto abort_unlock;
4443 }
4444 goto done_unlock;
4445 }
4446 if (!list_empty(&mddev->disks)) {
4447 printk(KERN_WARNING
4448 "md: array %s already has disks!\n",
4449 mdname(mddev));
4450 err = -EBUSY;
4451 goto abort_unlock;
4452 }
4453 if (mddev->raid_disks) {
4454 printk(KERN_WARNING
4455 "md: array %s already initialised!\n",
4456 mdname(mddev));
4457 err = -EBUSY;
4458 goto abort_unlock;
4459 }
4460 err = set_array_info(mddev, &info);
4461 if (err) {
4462 printk(KERN_WARNING "md: couldn't set"
4463 " array info. %d\n", err);
4464 goto abort_unlock;
4465 }
4466 }
4467 goto done_unlock;
4468
4469 default:;
4470 }
4471
4472 /*
4473 * Commands querying/configuring an existing array:
4474 */
32a7627c 4475 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3f9d7b0d 4476 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
32a7627c 4477 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3f9d7b0d
N		 4478 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4479 && cmd != GET_BITMAP_FILE) {
1da177e4
LT		 4480 err = -ENODEV;
4481 goto abort_unlock;
4482 }
4483
4484 /*
4485 * Commands even a read-only array can execute:
4486 */
4487 switch (cmd)
4488 {
4489 case GET_ARRAY_INFO:
4490 err = get_array_info(mddev, argp);
4491 goto done_unlock;
4492
32a7627c 4493 case GET_BITMAP_FILE:
87162a28 4494 err = get_bitmap_file(mddev, argp);
32a7627c
N		 4495 goto done_unlock;
4496
1da177e4
LT		 4497 case GET_DISK_INFO:
4498 err = get_disk_info(mddev, argp);
4499 goto done_unlock;
4500
4501 case RESTART_ARRAY_RW:
4502 err = restart_array(mddev);
4503 goto done_unlock;
4504
4505 case STOP_ARRAY:
4506 err = do_md_stop (mddev, 0);
4507 goto done_unlock;
4508
4509 case STOP_ARRAY_RO:
4510 err = do_md_stop (mddev, 1);
4511 goto done_unlock;
4512
4513 /*
4514 * We have a problem here : there is no easy way to give a CHS
4515 * virtual geometry. We currently pretend that we have a 2 heads
4516 * 4 sectors (with a BIG number of cylinders...). This drives
4517 * dosfs just mad... ;-)
4518 */
1da177e4
LT		 4519 }
4520
4521 /*
4522 * The remaining ioctls are changing the state of the
f91de92e
N		 4523 * superblock, so we do not allow them on read-only arrays.
4524 * However non-MD ioctls (e.g. get-size) will still come through
4525 * here and hit the 'default' below, so only disallow
4526 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 4527 */
f91de92e
N		 4528 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4529 mddev->ro && mddev->pers) {
4530 if (mddev->ro == 2) {
4531 mddev->ro = 0;
4532 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4533 md_wakeup_thread(mddev->thread);
4534
4535 } else {
4536 err = -EROFS;
4537 goto abort_unlock;
4538 }
1da177e4
LT		 4539 }
4540
4541 switch (cmd)
4542 {
4543 case ADD_NEW_DISK:
4544 {
4545 mdu_disk_info_t info;
4546 if (copy_from_user(&info, argp, sizeof(info)))
4547 err = -EFAULT;
4548 else
4549 err = add_new_disk(mddev, &info);
4550 goto done_unlock;
4551 }
4552
4553 case HOT_REMOVE_DISK:
4554 err = hot_remove_disk(mddev, new_decode_dev(arg));
4555 goto done_unlock;
4556
4557 case HOT_ADD_DISK:
4558 err = hot_add_disk(mddev, new_decode_dev(arg));
4559 goto done_unlock;
4560
4561 case SET_DISK_FAULTY:
4562 err = set_disk_faulty(mddev, new_decode_dev(arg));
4563 goto done_unlock;
4564
4565 case RUN_ARRAY:
4566 err = do_md_run (mddev);
4567 goto done_unlock;
4568
32a7627c
N		 4569 case SET_BITMAP_FILE:
4570 err = set_bitmap_file(mddev, (int)arg);
4571 goto done_unlock;
4572
1da177e4 4573 default:
1da177e4
LT		 4574 err = -EINVAL;
4575 goto abort_unlock;
4576 }
4577
4578done_unlock:
4579abort_unlock:
4580 mddev_unlock(mddev);
4581
4582 return err;
4583done:
4584 if (err)
4585 MD_BUG();
4586abort:
4587 return err;
4588}
4589
4590static int md_open(struct inode *inode, struct file *file)
4591{
4592 /*
4593 * Succeed if we can lock the mddev, which confirms that
4594 * it isn't being stopped right now.
4595 */
4596 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4597 int err;
4598
d63a5a74 4599 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
1da177e4
LT		 4600 goto out;
4601
4602 err = 0;
4603 mddev_get(mddev);
4604 mddev_unlock(mddev);
4605
4606 check_disk_change(inode->i_bdev);
4607 out:
4608 return err;
4609}
4610
4611static int md_release(struct inode *inode, struct file * file)
4612{
4613 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4614
52e5f9d1 4615 BUG_ON(!mddev);
1da177e4
LT		 4616 mddev_put(mddev);
4617
4618 return 0;
4619}
4620
44ce6294
LT		 4621static int md_media_changed(struct gendisk *disk)
4622{
4623 mddev_t *mddev = disk->private_data;
4624
4625 return mddev->changed;
4626}
4627
4628static int md_revalidate(struct gendisk *disk)
4629{
4630 mddev_t *mddev = disk->private_data;
4631
4632 mddev->changed = 0;
4633 return 0;
4634}
1da177e4
LT		 4635static struct block_device_operations md_fops =
4636{
4637 .owner = THIS_MODULE,
4638 .open = md_open,
4639 .release = md_release,
4640 .ioctl = md_ioctl,
a885c8c4 4641 .getgeo = md_getgeo,
44ce6294
LT		 4642 .media_changed = md_media_changed,
4643 .revalidate_disk= md_revalidate,
1da177e4
LT		 4644};
4645
75c96f85 4646static int md_thread(void * arg)
1da177e4
LT		 4647{
4648 mdk_thread_t *thread = arg;
4649
1da177e4
LT		 4650 /*
4651 * md_thread is a 'system-thread', it's priority should be very
4652 * high. We avoid resource deadlocks individually in each
4653 * raid personality. (RAID5 does preallocation) We also use RR and
4654 * the very same RT priority as kswapd, thus we will never get
4655 * into a priority inversion deadlock.
4656 *
4657 * we definitely have to have equal or higher priority than
4658 * bdflush, otherwise bdflush will deadlock if there are too
4659 * many dirty RAID5 blocks.
4660 */
1da177e4 4661
6985c43f 4662 allow_signal(SIGKILL);
a6fb0934 4663 while (!kthread_should_stop()) {
1da177e4 4664
93588e22
N		 4665 /* We need to wait INTERRUPTIBLE so that
4666 * we don't add to the load-average.
4667 * That means we need to be sure no signals are
4668 * pending
4669 */
4670 if (signal_pending(current))
4671 flush_signals(current);
4672
4673 wait_event_interruptible_timeout
4674 (thread->wqueue,
4675 test_bit(THREAD_WAKEUP, &thread->flags)
4676 || kthread_should_stop(),
4677 thread->timeout);
1da177e4
LT		 4678
4679 clear_bit(THREAD_WAKEUP, &thread->flags);
4680
787453c2 4681 thread->run(thread->mddev);
1da177e4 4682 }
a6fb0934 4683
1da177e4
LT		 4684 return 0;
4685}
4686
4687void md_wakeup_thread(mdk_thread_t *thread)
4688{
4689 if (thread) {
4690 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4691 set_bit(THREAD_WAKEUP, &thread->flags);
4692 wake_up(&thread->wqueue);
4693 }
4694}
4695
4696mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4697 const char *name)
4698{
4699 mdk_thread_t *thread;
1da177e4 4700
9ffae0cf 4701 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 4702 if (!thread)
4703 return NULL;
4704
1da177e4
LT		 4705 init_waitqueue_head(&thread->wqueue);
4706
1da177e4
LT		 4707 thread->run = run;
4708 thread->mddev = mddev;
32a7627c 4709 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 4710 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 4711 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 4712 kfree(thread);
4713 return NULL;
4714 }
1da177e4
LT		 4715 return thread;
4716}
4717
1da177e4
LT		 4718void md_unregister_thread(mdk_thread_t *thread)
4719{
d28446fe 4720 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
a6fb0934
N		 4721
4722 kthread_stop(thread->tsk);
1da177e4
LT		 4723 kfree(thread);
4724}
4725
4726void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4727{
4728 if (!mddev) {
4729 MD_BUG();
4730 return;
4731 }
4732
b2d444d7 4733 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 4734 return;
32a7627c 4735/*
1da177e4
LT		 4736 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4737 mdname(mddev),
4738 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4739 __builtin_return_address(0),__builtin_return_address(1),
4740 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 4741*/
d0a0a5ee
AM		 4742 if (!mddev->pers)
4743 return;
1da177e4
LT		 4744 if (!mddev->pers->error_handler)
4745 return;
4746 mddev->pers->error_handler(mddev,rdev);
4747 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4748 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4749 md_wakeup_thread(mddev->thread);
c331eb04 4750 md_new_event_inintr(mddev);
1da177e4
LT		 4751}
4752
4753/* seq_file implementation /proc/mdstat */
4754
4755static void status_unused(struct seq_file *seq)
4756{
4757 int i = 0;
4758 mdk_rdev_t *rdev;
4759 struct list_head *tmp;
4760
4761 seq_printf(seq, "unused devices: ");
4762
4763 ITERATE_RDEV_PENDING(rdev,tmp) {
4764 char b[BDEVNAME_SIZE];
4765 i++;
4766 seq_printf(seq, "%s ",
4767 bdevname(rdev->bdev,b));
4768 }
4769 if (!i)
4770 seq_printf(seq, "<none>");
4771
4772 seq_printf(seq, "\n");
4773}
4774
4775
4776static void status_resync(struct seq_file *seq, mddev_t * mddev)
4777{
4588b42e
N		 4778 sector_t max_blocks, resync, res;
4779 unsigned long dt, db, rt;
4780 int scale;
4781 unsigned int per_milli;
1da177e4
LT		 4782
4783 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4784
4785 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4786 max_blocks = mddev->resync_max_sectors >> 1;
4787 else
4788 max_blocks = mddev->size;
4789
4790 /*
4791 * Should not happen.
4792 */
4793 if (!max_blocks) {
4794 MD_BUG();
4795 return;
4796 }
4588b42e
N		 4797 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4798 * in a sector_t, and (max_blocks>>scale) will fit in a
4799 * u32, as those are the requirements for sector_div.
4800 * Thus 'scale' must be at least 10
4801 */
4802 scale = 10;
4803 if (sizeof(sector_t) > sizeof(unsigned long)) {
4804 while ( max_blocks/2 > (1ULL<<(scale+32)))
4805 scale++;
4806 }
4807 res = (resync>>scale)*1000;
4808 sector_div(res, (u32)((max_blocks>>scale)+1));
4809
4810 per_milli = res;
1da177e4 4811 {
4588b42e 4812 int i, x = per_milli/50, y = 20-x;
1da177e4
LT		 4813 seq_printf(seq, "[");
4814 for (i = 0; i < x; i++)
4815 seq_printf(seq, "=");
4816 seq_printf(seq, ">");
4817 for (i = 0; i < y; i++)
4818 seq_printf(seq, ".");
4819 seq_printf(seq, "] ");
4820 }
4588b42e 4821 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
ccfcc3c1
N		 4822 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
4823 "reshape" :
61df9d91
N		 4824 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
4825 "check" :
4826 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4827 "resync" : "recovery"))),
4828 per_milli/10, per_milli % 10,
4588b42e
N		 4829 (unsigned long long) resync,
4830 (unsigned long long) max_blocks);
1da177e4
LT		 4831
4832 /*
4833 * We do not want to overflow, so the order of operands and
4834 * the * 100 / 100 trick are important. We do a +1 to be
4835 * safe against division by zero. We only estimate anyway.
4836 *
4837 * dt: time from mark until now
4838 * db: blocks written from mark until now
4839 * rt: remaining time
4840 */
4841 dt = ((jiffies - mddev->resync_mark) / HZ);
4842 if (!dt) dt++;
ff4e8d9a
N		 4843 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
4844 - mddev->resync_mark_cnt;
4845 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
1da177e4
LT		 4846
4847 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4848
ff4e8d9a 4849 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
1da177e4
LT		 4850}
4851
4852static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4853{
4854 struct list_head *tmp;
4855 loff_t l = *pos;
4856 mddev_t *mddev;
4857
4858 if (l >= 0x10000)
4859 return NULL;
4860 if (!l--)
4861 /* header */
4862 return (void*)1;
4863
4864 spin_lock(&all_mddevs_lock);
4865 list_for_each(tmp,&all_mddevs)
4866 if (!l--) {
4867 mddev = list_entry(tmp, mddev_t, all_mddevs);
4868 mddev_get(mddev);
4869 spin_unlock(&all_mddevs_lock);
4870 return mddev;
4871 }
4872 spin_unlock(&all_mddevs_lock);
4873 if (!l--)
4874 return (void*)2;/* tail */
4875 return NULL;
4876}
4877
4878static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4879{
4880 struct list_head *tmp;
4881 mddev_t *next_mddev, *mddev = v;
4882
4883 ++*pos;
4884 if (v == (void*)2)
4885 return NULL;
4886
4887 spin_lock(&all_mddevs_lock);
4888 if (v == (void*)1)
4889 tmp = all_mddevs.next;
4890 else
4891 tmp = mddev->all_mddevs.next;
4892 if (tmp != &all_mddevs)
4893 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4894 else {
4895 next_mddev = (void*)2;
4896 *pos = 0x10000;
4897 }
4898 spin_unlock(&all_mddevs_lock);
4899
4900 if (v != (void*)1)
4901 mddev_put(mddev);
4902 return next_mddev;
4903
4904}
4905
4906static void md_seq_stop(struct seq_file *seq, void *v)
4907{
4908 mddev_t *mddev = v;
4909
4910 if (mddev && v != (void*)1 && v != (void*)2)
4911 mddev_put(mddev);
4912}
4913
d7603b7e
N		 4914struct mdstat_info {
4915 int event;
4916};
4917
1da177e4
LT		 4918static int md_seq_show(struct seq_file *seq, void *v)
4919{
4920 mddev_t *mddev = v;
4921 sector_t size;
4922 struct list_head *tmp2;
4923 mdk_rdev_t *rdev;
d7603b7e 4924 struct mdstat_info *mi = seq->private;
32a7627c 4925 struct bitmap *bitmap;
1da177e4
LT		 4926
4927 if (v == (void*)1) {
2604b703 4928 struct mdk_personality *pers;
1da177e4
LT		 4929 seq_printf(seq, "Personalities : ");
4930 spin_lock(&pers_lock);
2604b703
N		 4931 list_for_each_entry(pers, &pers_list, list)
4932 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT		 4933
4934 spin_unlock(&pers_lock);
4935 seq_printf(seq, "\n");
d7603b7e 4936 mi->event = atomic_read(&md_event_count);
1da177e4
LT		 4937 return 0;
4938 }
4939 if (v == (void*)2) {
4940 status_unused(seq);
4941 return 0;
4942 }
4943
5dc5cf7d 4944 if (mddev_lock(mddev) < 0)
1da177e4 4945 return -EINTR;
5dc5cf7d 4946
1da177e4
LT		 4947 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4948 seq_printf(seq, "%s : %sactive", mdname(mddev),
4949 mddev->pers ? "" : "in");
4950 if (mddev->pers) {
f91de92e 4951 if (mddev->ro==1)
1da177e4 4952 seq_printf(seq, " (read-only)");
f91de92e
N		 4953 if (mddev->ro==2)
4954 seq_printf(seq, "(auto-read-only)");
1da177e4
LT		 4955 seq_printf(seq, " %s", mddev->pers->name);
4956 }
4957
4958 size = 0;
4959 ITERATE_RDEV(mddev,rdev,tmp2) {
4960 char b[BDEVNAME_SIZE];
4961 seq_printf(seq, " %s[%d]",
4962 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 4963 if (test_bit(WriteMostly, &rdev->flags))
4964 seq_printf(seq, "(W)");
b2d444d7 4965 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4966 seq_printf(seq, "(F)");
4967 continue;
b325a32e
N		 4968 } else if (rdev->raid_disk < 0)
4969 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 4970 size += rdev->size;
4971 }
4972
4973 if (!list_empty(&mddev->disks)) {
4974 if (mddev->pers)
4975 seq_printf(seq, "\n %llu blocks",
4976 (unsigned long long)mddev->array_size);
4977 else
4978 seq_printf(seq, "\n %llu blocks",
4979 (unsigned long long)size);
4980 }
1cd6bf19
N		 4981 if (mddev->persistent) {
4982 if (mddev->major_version != 0 ||
4983 mddev->minor_version != 90) {
4984 seq_printf(seq," super %d.%d",
4985 mddev->major_version,
4986 mddev->minor_version);
4987 }
4988 } else
4989 seq_printf(seq, " super non-persistent");
1da177e4
LT		 4990
4991 if (mddev->pers) {
4992 mddev->pers->status (seq, mddev);
4993 seq_printf(seq, "\n ");
8e1b39d6
N		 4994 if (mddev->pers->sync_request) {
4995 if (mddev->curr_resync > 2) {
4996 status_resync (seq, mddev);
4997 seq_printf(seq, "\n ");
4998 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4999 seq_printf(seq, "\tresync=DELAYED\n ");
5000 else if (mddev->recovery_cp < MaxSector)
5001 seq_printf(seq, "\tresync=PENDING\n ");
5002 }
32a7627c
N		 5003 } else
5004 seq_printf(seq, "\n ");
5005
5006 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 5007 unsigned long chunk_kb;
5008 unsigned long flags;
32a7627c
N		 5009 spin_lock_irqsave(&bitmap->lock, flags);
5010 chunk_kb = bitmap->chunksize >> 10;
5011 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5012 "%lu%s chunk",
5013 bitmap->pages - bitmap->missing_pages,
5014 bitmap->pages,
5015 (bitmap->pages - bitmap->missing_pages)
5016 << (PAGE_SHIFT - 10),
5017 chunk_kb ? chunk_kb : bitmap->chunksize,
5018 chunk_kb ? "KB" : "B");
78d742d8
N		 5019 if (bitmap->file) {
5020 seq_printf(seq, ", file: ");
c649bb9c
JS		 5021 seq_path(seq, bitmap->file->f_path.mnt,
5022 bitmap->file->f_path.dentry," \t\n");
32a7627c 5023 }
78d742d8 5024
32a7627c
N		 5025 seq_printf(seq, "\n");
5026 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 5027 }
5028
5029 seq_printf(seq, "\n");
5030 }
5031 mddev_unlock(mddev);
5032
5033 return 0;
5034}
5035
5036static struct seq_operations md_seq_ops = {
5037 .start = md_seq_start,
5038 .next = md_seq_next,
5039 .stop = md_seq_stop,
5040 .show = md_seq_show,
5041};
5042
5043static int md_seq_open(struct inode *inode, struct file *file)
5044{
5045 int error;
d7603b7e
N		 5046 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5047 if (mi == NULL)
5048 return -ENOMEM;
1da177e4
LT		 5049
5050 error = seq_open(file, &md_seq_ops);
d7603b7e
N		 5051 if (error)
5052 kfree(mi);
5053 else {
5054 struct seq_file *p = file->private_data;
5055 p->private = mi;
5056 mi->event = atomic_read(&md_event_count);
5057 }
1da177e4
LT		 5058 return error;
5059}
5060
d7603b7e
N		 5061static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5062{
5063 struct seq_file *m = filp->private_data;
5064 struct mdstat_info *mi = m->private;
5065 int mask;
5066
5067 poll_wait(filp, &md_event_waiters, wait);
5068
5069 /* always allow read */
5070 mask = POLLIN | POLLRDNORM;
5071
5072 if (mi->event != atomic_read(&md_event_count))
5073 mask |= POLLERR | POLLPRI;
5074 return mask;
5075}
5076
fa027c2a 5077static const struct file_operations md_seq_fops = {
e24650c2 5078 .owner = THIS_MODULE,
1da177e4
LT		 5079 .open = md_seq_open,
5080 .read = seq_read,
5081 .llseek = seq_lseek,
c3f94b40 5082 .release = seq_release_private,
d7603b7e 5083 .poll = mdstat_poll,
1da177e4
LT		 5084};
5085
2604b703 5086int register_md_personality(struct mdk_personality *p)
1da177e4 5087{
1da177e4 5088 spin_lock(&pers_lock);
2604b703
N		 5089 list_add_tail(&p->list, &pers_list);
5090 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
1da177e4
LT		 5091 spin_unlock(&pers_lock);
5092 return 0;
5093}
5094
2604b703 5095int unregister_md_personality(struct mdk_personality *p)
1da177e4 5096{
2604b703 5097 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 5098 spin_lock(&pers_lock);
2604b703 5099 list_del_init(&p->list);
1da177e4
LT		 5100 spin_unlock(&pers_lock);
5101 return 0;
5102}
5103
5104static int is_mddev_idle(mddev_t *mddev)
5105{
5106 mdk_rdev_t * rdev;
5107 struct list_head *tmp;
5108 int idle;
713f6ab1 5109 long curr_events;
1da177e4
LT		 5110
5111 idle = 1;
5112 ITERATE_RDEV(mddev,rdev,tmp) {
5113 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 5114 curr_events = disk_stat_read(disk, sectors[0]) +
5115 disk_stat_read(disk, sectors[1]) -
1da177e4 5116 atomic_read(&disk->sync_io);
713f6ab1
N		 5117 /* sync IO will cause sync_io to increase before the disk_stats
5118 * as sync_io is counted when a request starts, and
5119 * disk_stats is counted when it completes.
5120 * So resync activity will cause curr_events to be smaller than
5121 * when there was no such activity.
5122 * non-sync IO will cause disk_stat to increase without
5123 * increasing sync_io so curr_events will (eventually)
5124 * be larger than it was before. Once it becomes
5125 * substantially larger, the test below will cause
5126 * the array to appear non-idle, and resync will slow
5127 * down.
5128 * If there is a lot of outstanding resync activity when
5129 * we set last_event to curr_events, then all that activity
5130 * completing might cause the array to appear non-idle
5131 * and resync will be slowed down even though there might
5132 * not have been non-resync activity. This will only
5133 * happen once though. 'last_events' will soon reflect
5134 * the state where there is little or no outstanding
5135 * resync requests, and further resync activity will
5136 * always make curr_events less than last_events.
c0e48521 5137 *
1da177e4 5138 */
713f6ab1 5139 if (curr_events - rdev->last_events > 4096) {
1da177e4
LT		 5140 rdev->last_events = curr_events;
5141 idle = 0;
5142 }
5143 }
5144 return idle;
5145}
5146
5147void md_done_sync(mddev_t *mddev, int blocks, int ok)
5148{
5149 /* another "blocks" (512byte) blocks have been synced */
5150 atomic_sub(blocks, &mddev->recovery_active);
5151 wake_up(&mddev->recovery_wait);
5152 if (!ok) {
5153 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5154 md_wakeup_thread(mddev->thread);
5155 // stop recovery, signal do_sync ....
5156 }
5157}
5158
5159
06d91a5f
N		 5160/* md_write_start(mddev, bi)
5161 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 5162 * in superblock) before writing, schedule a superblock update
5163 * and wait for it to complete.
06d91a5f 5164 */
3d310eb7 5165void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 5166{
06d91a5f 5167 if (bio_data_dir(bi) != WRITE)
3d310eb7 5168 return;
06d91a5f 5169
f91de92e
N		 5170 BUG_ON(mddev->ro == 1);
5171 if (mddev->ro == 2) {
5172 /* need to switch to read/write */
5173 mddev->ro = 0;
5174 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5175 md_wakeup_thread(mddev->thread);
5176 }
06d91a5f 5177 atomic_inc(&mddev->writes_pending);
06d91a5f 5178 if (mddev->in_sync) {
a9701a30 5179 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 5180 if (mddev->in_sync) {
5181 mddev->in_sync = 0;
850b2b42 5182 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3d310eb7
N		 5183 md_wakeup_thread(mddev->thread);
5184 }
a9701a30 5185 spin_unlock_irq(&mddev->write_lock);
06d91a5f 5186 }
850b2b42 5187 wait_event(mddev->sb_wait, mddev->flags==0);
1da177e4
LT		 5188}
5189
5190void md_write_end(mddev_t *mddev)
5191{
5192 if (atomic_dec_and_test(&mddev->writes_pending)) {
5193 if (mddev->safemode == 2)
5194 md_wakeup_thread(mddev->thread);
16f17b39 5195 else if (mddev->safemode_delay)
1da177e4
LT		 5196 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5197 }
5198}
5199
2a2275d6
N		 5200/* md_allow_write(mddev)
5201 * Calling this ensures that the array is marked 'active' so that writes
5202 * may proceed without blocking. It is important to call this before
5203 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5204 * Must be called with mddev_lock held.
5205 */
5206void md_allow_write(mddev_t *mddev)
5207{
5208 if (!mddev->pers)
5209 return;
5210 if (mddev->ro)
5211 return;
5212
5213 spin_lock_irq(&mddev->write_lock);
5214 if (mddev->in_sync) {
5215 mddev->in_sync = 0;
5216 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5217 if (mddev->safemode_delay &&
5218 mddev->safemode == 0)
5219 mddev->safemode = 1;
5220 spin_unlock_irq(&mddev->write_lock);
5221 md_update_sb(mddev, 0);
5222 } else
5223 spin_unlock_irq(&mddev->write_lock);
5224}
5225EXPORT_SYMBOL_GPL(md_allow_write);
5226
75c96f85 5227static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
1da177e4
LT		 5228
5229#define SYNC_MARKS 10
5230#define SYNC_MARK_STEP (3*HZ)
29269553 5231void md_do_sync(mddev_t *mddev)
1da177e4
LT		 5232{
5233 mddev_t *mddev2;
5234 unsigned int currspeed = 0,
5235 window;
57afd89f 5236 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 5237 unsigned long mark[SYNC_MARKS];
5238 sector_t mark_cnt[SYNC_MARKS];
5239 int last_mark,m;
5240 struct list_head *tmp;
5241 sector_t last_check;
57afd89f 5242 int skipped = 0;
5fd6c1dc
N		 5243 struct list_head *rtmp;
5244 mdk_rdev_t *rdev;
61df9d91 5245 char *desc;
1da177e4
LT		 5246
5247 /* just incase thread restarts... */
5248 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5249 return;
5fd6c1dc
N		 5250 if (mddev->ro) /* never try to sync a read-only array */
5251 return;
1da177e4 5252
61df9d91
N		 5253 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5254 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5255 desc = "data-check";
5256 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5257 desc = "requested-resync";
5258 else
5259 desc = "resync";
5260 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5261 desc = "reshape";
5262 else
5263 desc = "recovery";
5264
1da177e4
LT		 5265 /* we overload curr_resync somewhat here.
5266 * 0 == not engaged in resync at all
5267 * 2 == checking that there is no conflict with another sync
5268 * 1 == like 2, but have yielded to allow conflicting resync to
5269 * commense
5270 * other == active in resync - this many blocks
5271 *
5272 * Before starting a resync we must have set curr_resync to
5273 * 2, and then checked that every "conflicting" array has curr_resync
5274 * less than ours. When we find one that is the same or higher
5275 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5276 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5277 * This will mean we have to start checking from the beginning again.
5278 *
5279 */
5280
5281 do {
5282 mddev->curr_resync = 2;
5283
5284 try_again:
787453c2 5285 if (kthread_should_stop()) {
6985c43f 5286 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 5287 goto skip;
5288 }
5289 ITERATE_MDDEV(mddev2,tmp) {
1da177e4
LT		 5290 if (mddev2 == mddev)
5291 continue;
5292 if (mddev2->curr_resync &&
5293 match_mddev_units(mddev,mddev2)) {
5294 DEFINE_WAIT(wq);
5295 if (mddev < mddev2 && mddev->curr_resync == 2) {
5296 /* arbitrarily yield */
5297 mddev->curr_resync = 1;
5298 wake_up(&resync_wait);
5299 }
5300 if (mddev > mddev2 && mddev->curr_resync == 1)
5301 /* no need to wait here, we can wait the next
5302 * time 'round when curr_resync == 2
5303 */
5304 continue;
787453c2
N		 5305 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5306 if (!kthread_should_stop() &&
8712e553 5307 mddev2->curr_resync >= mddev->curr_resync) {
61df9d91
N		 5308 printk(KERN_INFO "md: delaying %s of %s"
5309 " until %s has finished (they"
1da177e4 5310 " share one or more physical units)\n",
61df9d91 5311 desc, mdname(mddev), mdname(mddev2));
1da177e4
LT		 5312 mddev_put(mddev2);
5313 schedule();
5314 finish_wait(&resync_wait, &wq);
5315 goto try_again;
5316 }
5317 finish_wait(&resync_wait, &wq);
5318 }
5319 }
5320 } while (mddev->curr_resync < 2);
5321
5fd6c1dc 5322 j = 0;
9d88883e 5323 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 5324 /* resync follows the size requested by the personality,
57afd89f 5325 * which defaults to physical size, but can be virtual size
1da177e4
LT		 5326 */
5327 max_sectors = mddev->resync_max_sectors;
9d88883e 5328 mddev->resync_mismatches = 0;
5fd6c1dc
N		 5329 /* we don't use the checkpoint if there's a bitmap */
5330 if (!mddev->bitmap &&
5331 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5332 j = mddev->recovery_cp;
ccfcc3c1
N		 5333 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5334 max_sectors = mddev->size << 1;
5fd6c1dc 5335 else {
1da177e4
LT		 5336 /* recovery follows the physical size of devices */
5337 max_sectors = mddev->size << 1;
5fd6c1dc
N		 5338 j = MaxSector;
5339 ITERATE_RDEV(mddev,rdev,rtmp)
5340 if (rdev->raid_disk >= 0 &&
5341 !test_bit(Faulty, &rdev->flags) &&
5342 !test_bit(In_sync, &rdev->flags) &&
5343 rdev->recovery_offset < j)
5344 j = rdev->recovery_offset;
5345 }
1da177e4 5346
61df9d91
N		 5347 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5348 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5349 " %d KB/sec/disk.\n", speed_min(mddev));
338cec32 5350 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
61df9d91
N		 5351 "(but not more than %d KB/sec) for %s.\n",
5352 speed_max(mddev), desc);
1da177e4
LT		 5353
5354 is_mddev_idle(mddev); /* this also initializes IO event counters */
5fd6c1dc 5355
57afd89f 5356 io_sectors = 0;
1da177e4
LT		 5357 for (m = 0; m < SYNC_MARKS; m++) {
5358 mark[m] = jiffies;
57afd89f 5359 mark_cnt[m] = io_sectors;
1da177e4
LT		 5360 }
5361 last_mark = 0;
5362 mddev->resync_mark = mark[last_mark];
5363 mddev->resync_mark_cnt = mark_cnt[last_mark];
5364
5365 /*
5366 * Tune reconstruction:
5367 */
5368 window = 32*(PAGE_SIZE/512);
5369 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5370 window/2,(unsigned long long) max_sectors/2);
5371
5372 atomic_set(&mddev->recovery_active, 0);
5373 init_waitqueue_head(&mddev->recovery_wait);
5374 last_check = 0;
5375
5376 if (j>2) {
5377 printk(KERN_INFO
61df9d91
N		 5378 "md: resuming %s of %s from checkpoint.\n",
5379 desc, mdname(mddev));
1da177e4
LT		 5380 mddev->curr_resync = j;
5381 }
5382
5383 while (j < max_sectors) {
57afd89f 5384 sector_t sectors;
1da177e4 5385
57afd89f
N		 5386 skipped = 0;
5387 sectors = mddev->pers->sync_request(mddev, j, &skipped,
88202a0c 5388 currspeed < speed_min(mddev));
57afd89f 5389 if (sectors == 0) {
1da177e4
LT		 5390 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5391 goto out;
5392 }
57afd89f
N		 5393
5394 if (!skipped) { /* actual IO requested */
5395 io_sectors += sectors;
5396 atomic_add(sectors, &mddev->recovery_active);
5397 }
5398
1da177e4
LT		 5399 j += sectors;
5400 if (j>1) mddev->curr_resync = j;
ff4e8d9a 5401 mddev->curr_mark_cnt = io_sectors;
d7603b7e
N		 5402 if (last_check == 0)
5403 /* this is the earliers that rebuilt will be
5404 * visible in /proc/mdstat
5405 */
5406 md_new_event(mddev);
57afd89f
N		 5407
5408 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 5409 continue;
5410
57afd89f 5411 last_check = io_sectors;
1da177e4
LT		 5412
5413 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
5414 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
5415 break;
5416
5417 repeat:
5418 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5419 /* step marks */
5420 int next = (last_mark+1) % SYNC_MARKS;
5421
5422 mddev->resync_mark = mark[next];
5423 mddev->resync_mark_cnt = mark_cnt[next];
5424 mark[next] = jiffies;
57afd89f 5425 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 5426 last_mark = next;
5427 }
5428
5429
787453c2 5430 if (kthread_should_stop()) {
1da177e4
LT		 5431 /*
5432 * got a signal, exit.
5433 */
5434 printk(KERN_INFO
5435 "md: md_do_sync() got signal ... exiting\n");
1da177e4
LT		 5436 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5437 goto out;
5438 }
5439
5440 /*
5441 * this loop exits only if either when we are slower than
5442 * the 'hard' speed limit, or the system was IO-idle for
5443 * a jiffy.
5444 * the system might be non-idle CPU-wise, but we only care
5445 * about not overloading the IO subsystem. (things like an
5446 * e2fsck being done on the RAID array should execute fast)
5447 */
5448 mddev->queue->unplug_fn(mddev->queue);
5449 cond_resched();
5450
57afd89f
N		 5451 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5452 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4 5453
88202a0c
N		 5454 if (currspeed > speed_min(mddev)) {
5455 if ((currspeed > speed_max(mddev)) ||
1da177e4 5456 !is_mddev_idle(mddev)) {
c0e48521 5457 msleep(500);
1da177e4
LT		 5458 goto repeat;
5459 }
5460 }
5461 }
61df9d91 5462 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
1da177e4
LT		 5463 /*
5464 * this also signals 'finished resyncing' to md_stop
5465 */
5466 out:
5467 mddev->queue->unplug_fn(mddev->queue);
5468
5469 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5470
5471 /* tell personality that we are finished */
57afd89f 5472 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 5473
5474 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
ccfcc3c1 5475 !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5fd6c1dc
N		 5476 mddev->curr_resync > 2) {
5477 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5478 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5479 if (mddev->curr_resync >= mddev->recovery_cp) {
5480 printk(KERN_INFO
61df9d91
N		 5481 "md: checkpointing %s of %s.\n",
5482 desc, mdname(mddev));
5fd6c1dc
N		 5483 mddev->recovery_cp = mddev->curr_resync;
5484 }
5485 } else
5486 mddev->recovery_cp = MaxSector;
5487 } else {
5488 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5489 mddev->curr_resync = MaxSector;
5490 ITERATE_RDEV(mddev,rdev,rtmp)
5491 if (rdev->raid_disk >= 0 &&
5492 !test_bit(Faulty, &rdev->flags) &&
5493 !test_bit(In_sync, &rdev->flags) &&
5494 rdev->recovery_offset < mddev->curr_resync)
5495 rdev->recovery_offset = mddev->curr_resync;
5fd6c1dc 5496 }
1da177e4 5497 }
17571284 5498 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 5499
1da177e4
LT		 5500 skip:
5501 mddev->curr_resync = 0;
5502 wake_up(&resync_wait);
5503 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5504 md_wakeup_thread(mddev->thread);
5505}
29269553 5506EXPORT_SYMBOL_GPL(md_do_sync);
1da177e4
LT		 5507
5508
b4c4c7b8
N		 5509static int remove_and_add_spares(mddev_t *mddev)
5510{
5511 mdk_rdev_t *rdev;
5512 struct list_head *rtmp;
5513 int spares = 0;
5514
5515 ITERATE_RDEV(mddev,rdev,rtmp)
5516 if (rdev->raid_disk >= 0 &&
5517 (test_bit(Faulty, &rdev->flags) ||
5518 ! test_bit(In_sync, &rdev->flags)) &&
5519 atomic_read(&rdev->nr_pending)==0) {
5520 if (mddev->pers->hot_remove_disk(
5521 mddev, rdev->raid_disk)==0) {
5522 char nm[20];
5523 sprintf(nm,"rd%d", rdev->raid_disk);
5524 sysfs_remove_link(&mddev->kobj, nm);
5525 rdev->raid_disk = -1;
5526 }
5527 }
5528
5529 if (mddev->degraded) {
5530 ITERATE_RDEV(mddev,rdev,rtmp)
5531 if (rdev->raid_disk < 0
5532 && !test_bit(Faulty, &rdev->flags)) {
5533 rdev->recovery_offset = 0;
5534 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5535 char nm[20];
5536 sprintf(nm, "rd%d", rdev->raid_disk);
5e55e2f5
N		 5537 if (sysfs_create_link(&mddev->kobj,
5538 &rdev->kobj, nm))
5539 printk(KERN_WARNING
5540 "md: cannot register "
5541 "%s for %s\n",
5542 nm, mdname(mddev));
b4c4c7b8
N		 5543 spares++;
5544 md_new_event(mddev);
5545 } else
5546 break;
5547 }
5548 }
5549 return spares;
5550}
1da177e4
LT		 5551/*
5552 * This routine is regularly called by all per-raid-array threads to
5553 * deal with generic issues like resync and super-block update.
5554 * Raid personalities that don't have a thread (linear/raid0) do not
5555 * need this as they never do any recovery or update the superblock.
5556 *
5557 * It does not do any resync itself, but rather "forks" off other threads
5558 * to do that as needed.
5559 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5560 * "->recovery" and create a thread at ->sync_thread.
5561 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5562 * and wakeups up this thread which will reap the thread and finish up.
5563 * This thread also removes any faulty devices (with nr_pending == 0).
5564 *
5565 * The overall approach is:
5566 * 1/ if the superblock needs updating, update it.
5567 * 2/ If a recovery thread is running, don't do anything else.
5568 * 3/ If recovery has finished, clean up, possibly marking spares active.
5569 * 4/ If there are any faulty devices, remove them.
5570 * 5/ If array is degraded, try to add spares devices
5571 * 6/ If array has spares or is not in-sync, start a resync thread.
5572 */
5573void md_check_recovery(mddev_t *mddev)
5574{
5575 mdk_rdev_t *rdev;
5576 struct list_head *rtmp;
5577
5578
5f40402d
N		 5579 if (mddev->bitmap)
5580 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 5581
5582 if (mddev->ro)
5583 return;
fca4d848
N		 5584
5585 if (signal_pending(current)) {
5586 if (mddev->pers->sync_request) {
5587 printk(KERN_INFO "md: %s in immediate safe mode\n",
5588 mdname(mddev));
5589 mddev->safemode = 2;
5590 }
5591 flush_signals(current);
5592 }
5593
1da177e4 5594 if ( ! (
850b2b42 5595 mddev->flags ||
1da177e4 5596 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848
N		 5597 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
5598 (mddev->safemode == 1) ||
5599 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5600 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 5601 ))
5602 return;
fca4d848 5603
df5b89b3 5604 if (mddev_trylock(mddev)) {
b4c4c7b8 5605 int spares = 0;
fca4d848 5606
a9701a30 5607 spin_lock_irq(&mddev->write_lock);
fca4d848
N		 5608 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
5609 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
5610 mddev->in_sync = 1;
850b2b42 5611 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
fca4d848
N		 5612 }
5613 if (mddev->safemode == 1)
5614 mddev->safemode = 0;
a9701a30 5615 spin_unlock_irq(&mddev->write_lock);
fca4d848 5616
850b2b42
N		 5617 if (mddev->flags)
5618 md_update_sb(mddev, 0);
06d91a5f 5619
06d91a5f 5620
1da177e4
LT		 5621 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
5622 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
5623 /* resync/recovery still happening */
5624 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5625 goto unlock;
5626 }
5627 if (mddev->sync_thread) {
5628 /* resync has finished, collect result */
5629 md_unregister_thread(mddev->sync_thread);
5630 mddev->sync_thread = NULL;
5631 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5632 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5633 /* success...*/
5634 /* activate any spares */
5635 mddev->pers->spare_active(mddev);
5636 }
850b2b42 5637 md_update_sb(mddev, 1);
41158c7e
N		 5638
5639 /* if array is no-longer degraded, then any saved_raid_disk
5640 * information must be scrapped
5641 */
5642 if (!mddev->degraded)
5643 ITERATE_RDEV(mddev,rdev,rtmp)
5644 rdev->saved_raid_disk = -1;
5645
1da177e4
LT		 5646 mddev->recovery = 0;
5647 /* flag recovery needed just to double check */
5648 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
d7603b7e 5649 md_new_event(mddev);
1da177e4
LT		 5650 goto unlock;
5651 }
24dd469d
N		 5652 /* Clear some bits that don't mean anything, but
5653 * might be left set
5654 */
5655 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5656 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
5657 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
5658 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4 5659
5fd6c1dc
N		 5660 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5661 goto unlock;
1da177e4
LT		 5662 /* no recovery is running.
5663 * remove any failed drives, then
5664 * add spares if possible.
5665 * Spare are also removed and re-added, to allow
5666 * the personality to fail the re-add.
5667 */
1da177e4 5668
b4c4c7b8
N		 5669 if (mddev->reshape_position != MaxSector) {
5670 if (mddev->pers->check_reshape(mddev) != 0)
5671 /* Cannot proceed */
5672 goto unlock;
5673 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
5674 } else if ((spares = remove_and_add_spares(mddev))) {
24dd469d
N		 5675 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5676 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5677 } else if (mddev->recovery_cp < MaxSector) {
5678 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5679 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5680 /* nothing to be done ... */
1da177e4 5681 goto unlock;
24dd469d 5682
1da177e4
LT		 5683 if (mddev->pers->sync_request) {
5684 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 5685 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
5686 /* We are adding a device or devices to an array
5687 * which has the bitmap stored on all devices.
5688 * So make sure all bitmap pages get written
5689 */
5690 bitmap_write_all(mddev->bitmap);
5691 }
1da177e4
LT		 5692 mddev->sync_thread = md_register_thread(md_do_sync,
5693 mddev,
5694 "%s_resync");
5695 if (!mddev->sync_thread) {
5696 printk(KERN_ERR "%s: could not start resync"
5697 " thread...\n",
5698 mdname(mddev));
5699 /* leave the spares where they are, it shouldn't hurt */
5700 mddev->recovery = 0;
d7603b7e 5701 } else
1da177e4 5702 md_wakeup_thread(mddev->sync_thread);
d7603b7e 5703 md_new_event(mddev);
1da177e4
LT		 5704 }
5705 unlock:
5706 mddev_unlock(mddev);
5707 }
5708}
5709
75c96f85
AB		 5710static int md_notify_reboot(struct notifier_block *this,
5711 unsigned long code, void *x)
1da177e4
LT		 5712{
5713 struct list_head *tmp;
5714 mddev_t *mddev;
5715
5716 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
5717
5718 printk(KERN_INFO "md: stopping all md devices.\n");
5719
5720 ITERATE_MDDEV(mddev,tmp)
c71d4887 5721 if (mddev_trylock(mddev)) {
1da177e4 5722 do_md_stop (mddev, 1);
c71d4887
NB		 5723 mddev_unlock(mddev);
5724 }
1da177e4
LT		 5725 /*
5726 * certain more exotic SCSI devices are known to be
5727 * volatile wrt too early system reboots. While the
5728 * right place to handle this issue is the given
5729 * driver, we do want to have a safe RAID driver ...
5730 */
5731 mdelay(1000*1);
5732 }
5733 return NOTIFY_DONE;
5734}
5735
75c96f85 5736static struct notifier_block md_notifier = {
1da177e4
LT		 5737 .notifier_call = md_notify_reboot,
5738 .next = NULL,
5739 .priority = INT_MAX, /* before any real devices */
5740};
5741
5742static void md_geninit(void)
5743{
5744 struct proc_dir_entry *p;
5745
5746 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5747
5748 p = create_proc_entry("mdstat", S_IRUGO, NULL);
5749 if (p)
5750 p->proc_fops = &md_seq_fops;
5751}
5752
75c96f85 5753static int __init md_init(void)
1da177e4 5754{
1da177e4
LT		 5755 if (register_blkdev(MAJOR_NR, "md"))
5756 return -1;
5757 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
5758 unregister_blkdev(MAJOR_NR, "md");
5759 return -1;
5760 }
e8703fe1
N		 5761 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
5762 md_probe, NULL, NULL);
5763 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
1da177e4
LT		 5764 md_probe, NULL, NULL);
5765
1da177e4 5766 register_reboot_notifier(&md_notifier);
0b4d4147 5767 raid_table_header = register_sysctl_table(raid_root_table);
1da177e4
LT		 5768
5769 md_geninit();
5770 return (0);
5771}
5772
5773
5774#ifndef MODULE
5775
5776/*
5777 * Searches all registered partitions for autorun RAID arrays
5778 * at boot time.
5779 */
4d936ec1
ME		 5780
5781static LIST_HEAD(all_detected_devices);
5782struct detected_devices_node {
5783 struct list_head list;
5784 dev_t dev;
5785};
1da177e4
LT		 5786
5787void md_autodetect_dev(dev_t dev)
5788{
4d936ec1
ME		 5789 struct detected_devices_node *node_detected_dev;
5790
5791 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
5792 if (node_detected_dev) {
5793 node_detected_dev->dev = dev;
5794 list_add_tail(&node_detected_dev->list, &all_detected_devices);
5795 } else {
5796 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
5797 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
5798 }
1da177e4
LT		 5799}
5800
5801
5802static void autostart_arrays(int part)
5803{
5804 mdk_rdev_t *rdev;
4d936ec1
ME		 5805 struct detected_devices_node *node_detected_dev;
5806 dev_t dev;
5807 int i_scanned, i_passed;
1da177e4 5808
4d936ec1
ME		 5809 i_scanned = 0;
5810 i_passed = 0;
1da177e4 5811
4d936ec1 5812 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
1da177e4 5813
4d936ec1
ME		 5814 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
5815 i_scanned++;
5816 node_detected_dev = list_entry(all_detected_devices.next,
5817 struct detected_devices_node, list);
5818 list_del(&node_detected_dev->list);
5819 dev = node_detected_dev->dev;
5820 kfree(node_detected_dev);
df968c4e 5821 rdev = md_import_device(dev,0, 90);
1da177e4
LT		 5822 if (IS_ERR(rdev))
5823 continue;
5824
b2d444d7 5825 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 5826 MD_BUG();
5827 continue;
5828 }
5829 list_add(&rdev->same_set, &pending_raid_disks);
4d936ec1 5830 i_passed++;
1da177e4 5831 }
4d936ec1
ME		 5832
5833 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
5834 i_scanned, i_passed);
1da177e4
LT		 5835
5836 autorun_devices(part);
5837}
5838
fdee8ae4 5839#endif /* !MODULE */
1da177e4
LT		 5840
5841static __exit void md_exit(void)
5842{
5843 mddev_t *mddev;
5844 struct list_head *tmp;
8ab5e4c1 5845
e8703fe1
N		 5846 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
5847 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
1da177e4
LT		 5848
5849 unregister_blkdev(MAJOR_NR,"md");
5850 unregister_blkdev(mdp_major, "mdp");
5851 unregister_reboot_notifier(&md_notifier);
5852 unregister_sysctl_table(raid_table_header);
5853 remove_proc_entry("mdstat", NULL);
5854 ITERATE_MDDEV(mddev,tmp) {
5855 struct gendisk *disk = mddev->gendisk;
5856 if (!disk)
5857 continue;
5858 export_array(mddev);
5859 del_gendisk(disk);
5860 put_disk(disk);
5861 mddev->gendisk = NULL;
5862 mddev_put(mddev);
5863 }
5864}
5865
685784aa 5866subsys_initcall(md_init);
1da177e4
LT		 5867module_exit(md_exit)
5868
f91de92e
N		 5869static int get_ro(char *buffer, struct kernel_param *kp)
5870{
5871 return sprintf(buffer, "%d", start_readonly);
5872}
5873static int set_ro(const char *val, struct kernel_param *kp)
5874{
5875 char *e;
5876 int num = simple_strtoul(val, &e, 10);
5877 if (*val && (*e == '\0' || *e == '\n')) {
5878 start_readonly = num;
4dbcdc75 5879 return 0;
f91de92e
N		 5880 }
5881 return -EINVAL;
5882}
5883
80ca3a44
N		 5884module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
5885module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6ff8d8ec 5886
f91de92e 5887
1da177e4
LT		 5888EXPORT_SYMBOL(register_md_personality);
5889EXPORT_SYMBOL(unregister_md_personality);
5890EXPORT_SYMBOL(md_error);
5891EXPORT_SYMBOL(md_done_sync);
5892EXPORT_SYMBOL(md_write_start);
5893EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 5894EXPORT_SYMBOL(md_register_thread);
5895EXPORT_SYMBOL(md_unregister_thread);
5896EXPORT_SYMBOL(md_wakeup_thread);
1da177e4
LT		 5897EXPORT_SYMBOL(md_check_recovery);
5898MODULE_LICENSE("GPL");
aa1595e9 5899MODULE_ALIAS("md");
72008652 5900MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
Clone of davem's net-next-2.6 tree