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md: prevent duplicates in bind_rdev_to_array
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / md / md.c
CommitLineData
1da177e4
LT		 1/*
2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
4
5 completely rewritten, based on the MD driver code from Marc Zyngier
6
7 Changes:
8
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
16
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
19
20 Neil Brown <neilb@cse.unsw.edu.au>.
21
32a7627c
N		 22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
24
1da177e4
LT		 25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
28 any later version.
29
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
33*/
34
35#include <linux/module.h>
50511da3 36#include <linux/kernel.h>
a6fb0934 37#include <linux/kthread.h>
1da177e4
LT		 38#include <linux/linkage.h>
39#include <linux/raid/md.h>
32a7627c 40#include <linux/raid/bitmap.h>
1da177e4 41#include <linux/sysctl.h>
1da177e4 42#include <linux/buffer_head.h> /* for invalidate_bdev */
d7603b7e 43#include <linux/poll.h>
48c9c27b 44#include <linux/mutex.h>
16f17b39 45#include <linux/ctype.h>
7dfb7103 46#include <linux/freezer.h>
1da177e4
LT		 47
48#include <linux/init.h>
49
32a7627c
N		 50#include <linux/file.h>
51
1da177e4
LT		 52#ifdef CONFIG_KMOD
53#include <linux/kmod.h>
54#endif
55
56#include <asm/unaligned.h>
57
58#define MAJOR_NR MD_MAJOR
59#define MD_DRIVER
60
61/* 63 partitions with the alternate major number (mdp) */
62#define MdpMinorShift 6
63
64#define DEBUG 0
65#define dprintk(x...) ((void)(DEBUG && printk(x)))
66
67
68#ifndef MODULE
69static void autostart_arrays (int part);
70#endif
71
2604b703 72static LIST_HEAD(pers_list);
1da177e4
LT		 73static DEFINE_SPINLOCK(pers_lock);
74
5e56341d
AB		 75static void md_print_devices(void);
76
77#define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
78
1da177e4
LT		 79/*
80 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
81 * is 1000 KB/sec, so the extra system load does not show up that much.
82 * Increase it if you want to have more _guaranteed_ speed. Note that
338cec32 83 * the RAID driver will use the maximum available bandwidth if the IO
1da177e4
LT		 84 * subsystem is idle. There is also an 'absolute maximum' reconstruction
85 * speed limit - in case reconstruction slows down your system despite
86 * idle IO detection.
87 *
88 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
88202a0c 89 * or /sys/block/mdX/md/sync_speed_{min,max}
1da177e4
LT		 90 */
91
92static int sysctl_speed_limit_min = 1000;
93static int sysctl_speed_limit_max = 200000;
88202a0c
N		 94static inline int speed_min(mddev_t *mddev)
95{
96 return mddev->sync_speed_min ?
97 mddev->sync_speed_min : sysctl_speed_limit_min;
98}
99
100static inline int speed_max(mddev_t *mddev)
101{
102 return mddev->sync_speed_max ?
103 mddev->sync_speed_max : sysctl_speed_limit_max;
104}
1da177e4
LT		 105
106static struct ctl_table_header *raid_table_header;
107
108static ctl_table raid_table[] = {
109 {
110 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
111 .procname = "speed_limit_min",
112 .data = &sysctl_speed_limit_min,
113 .maxlen = sizeof(int),
80ca3a44 114 .mode = S_IRUGO|S_IWUSR,
1da177e4
LT		 115 .proc_handler = &proc_dointvec,
116 },
117 {
118 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
119 .procname = "speed_limit_max",
120 .data = &sysctl_speed_limit_max,
121 .maxlen = sizeof(int),
80ca3a44 122 .mode = S_IRUGO|S_IWUSR,
1da177e4
LT		 123 .proc_handler = &proc_dointvec,
124 },
125 { .ctl_name = 0 }
126};
127
128static ctl_table raid_dir_table[] = {
129 {
130 .ctl_name = DEV_RAID,
131 .procname = "raid",
132 .maxlen = 0,
80ca3a44 133 .mode = S_IRUGO|S_IXUGO,
1da177e4
LT		 134 .child = raid_table,
135 },
136 { .ctl_name = 0 }
137};
138
139static ctl_table raid_root_table[] = {
140 {
141 .ctl_name = CTL_DEV,
142 .procname = "dev",
143 .maxlen = 0,
144 .mode = 0555,
145 .child = raid_dir_table,
146 },
147 { .ctl_name = 0 }
148};
149
150static struct block_device_operations md_fops;
151
f91de92e
N		 152static int start_readonly;
153
d7603b7e
N		 154/*
155 * We have a system wide 'event count' that is incremented
156 * on any 'interesting' event, and readers of /proc/mdstat
157 * can use 'poll' or 'select' to find out when the event
158 * count increases.
159 *
160 * Events are:
161 * start array, stop array, error, add device, remove device,
162 * start build, activate spare
163 */
2989ddbd 164static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
d7603b7e 165static atomic_t md_event_count;
29269553 166void md_new_event(mddev_t *mddev)
d7603b7e
N		 167{
168 atomic_inc(&md_event_count);
169 wake_up(&md_event_waiters);
4508a7a7 170 sysfs_notify(&mddev->kobj, NULL, "sync_action");
d7603b7e 171}
29269553 172EXPORT_SYMBOL_GPL(md_new_event);
d7603b7e 173
c331eb04
N		 174/* Alternate version that can be called from interrupts
175 * when calling sysfs_notify isn't needed.
176 */
05381954 177static void md_new_event_inintr(mddev_t *mddev)
c331eb04
N		 178{
179 atomic_inc(&md_event_count);
180 wake_up(&md_event_waiters);
181}
182
1da177e4
LT		 183/*
184 * Enables to iterate over all existing md arrays
185 * all_mddevs_lock protects this list.
186 */
187static LIST_HEAD(all_mddevs);
188static DEFINE_SPINLOCK(all_mddevs_lock);
189
190
191/*
192 * iterates through all used mddevs in the system.
193 * We take care to grab the all_mddevs_lock whenever navigating
194 * the list, and to always hold a refcount when unlocked.
195 * Any code which breaks out of this loop while own
196 * a reference to the current mddev and must mddev_put it.
197 */
29ac4aa3 198#define for_each_mddev(mddev,tmp) \
1da177e4
LT		 199 \
200 for (({ spin_lock(&all_mddevs_lock); \
201 tmp = all_mddevs.next; \
202 mddev = NULL;}); \
203 ({ if (tmp != &all_mddevs) \
204 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
205 spin_unlock(&all_mddevs_lock); \
206 if (mddev) mddev_put(mddev); \
207 mddev = list_entry(tmp, mddev_t, all_mddevs); \
208 tmp != &all_mddevs;}); \
209 ({ spin_lock(&all_mddevs_lock); \
210 tmp = tmp->next;}) \
211 )
212
213
165125e1 214static int md_fail_request (struct request_queue *q, struct bio *bio)
1da177e4 215{
6712ecf8 216 bio_io_error(bio);
1da177e4
LT		 217 return 0;
218}
219
220static inline mddev_t *mddev_get(mddev_t *mddev)
221{
222 atomic_inc(&mddev->active);
223 return mddev;
224}
225
226static void mddev_put(mddev_t *mddev)
227{
228 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
229 return;
230 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
231 list_del(&mddev->all_mddevs);
926ce2d8 232 spin_unlock(&all_mddevs_lock);
1312f40e 233 blk_cleanup_queue(mddev->queue);
c10997f6 234 kobject_put(&mddev->kobj);
926ce2d8
N		 235 } else
236 spin_unlock(&all_mddevs_lock);
1da177e4
LT		 237}
238
239static mddev_t * mddev_find(dev_t unit)
240{
241 mddev_t *mddev, *new = NULL;
242
243 retry:
244 spin_lock(&all_mddevs_lock);
245 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
246 if (mddev->unit == unit) {
247 mddev_get(mddev);
248 spin_unlock(&all_mddevs_lock);
990a8baf 249 kfree(new);
1da177e4
LT		 250 return mddev;
251 }
252
253 if (new) {
254 list_add(&new->all_mddevs, &all_mddevs);
255 spin_unlock(&all_mddevs_lock);
256 return new;
257 }
258 spin_unlock(&all_mddevs_lock);
259
9ffae0cf 260 new = kzalloc(sizeof(*new), GFP_KERNEL);
1da177e4
LT		 261 if (!new)
262 return NULL;
263
1da177e4
LT		 264 new->unit = unit;
265 if (MAJOR(unit) == MD_MAJOR)
266 new->md_minor = MINOR(unit);
267 else
268 new->md_minor = MINOR(unit) >> MdpMinorShift;
269
df5b89b3 270 mutex_init(&new->reconfig_mutex);
1da177e4
LT		 271 INIT_LIST_HEAD(&new->disks);
272 INIT_LIST_HEAD(&new->all_mddevs);
273 init_timer(&new->safemode_timer);
274 atomic_set(&new->active, 1);
06d91a5f 275 spin_lock_init(&new->write_lock);
3d310eb7 276 init_waitqueue_head(&new->sb_wait);
08a02ecd 277 new->reshape_position = MaxSector;
c6207277 278 new->resync_max = MaxSector;
d897dbf9 279 new->level = LEVEL_NONE;
1da177e4
LT		 280
281 new->queue = blk_alloc_queue(GFP_KERNEL);
282 if (!new->queue) {
283 kfree(new);
284 return NULL;
285 }
75ad23bc
NP		 286 /* Can be unlocked because the queue is new: no concurrency */
287 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, new->queue);
1da177e4
LT		 288
289 blk_queue_make_request(new->queue, md_fail_request);
290
291 goto retry;
292}
293
294static inline int mddev_lock(mddev_t * mddev)
295{
df5b89b3 296 return mutex_lock_interruptible(&mddev->reconfig_mutex);
1da177e4
LT		 297}
298
1da177e4
LT		 299static inline int mddev_trylock(mddev_t * mddev)
300{
df5b89b3 301 return mutex_trylock(&mddev->reconfig_mutex);
1da177e4
LT		 302}
303
304static inline void mddev_unlock(mddev_t * mddev)
305{
df5b89b3 306 mutex_unlock(&mddev->reconfig_mutex);
1da177e4 307
005eca5e 308 md_wakeup_thread(mddev->thread);
1da177e4
LT		 309}
310
2989ddbd 311static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
1da177e4
LT		 312{
313 mdk_rdev_t * rdev;
314 struct list_head *tmp;
315
d089c6af 316 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 317 if (rdev->desc_nr == nr)
318 return rdev;
319 }
320 return NULL;
321}
322
323static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
324{
325 struct list_head *tmp;
326 mdk_rdev_t *rdev;
327
d089c6af 328 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 329 if (rdev->bdev->bd_dev == dev)
330 return rdev;
331 }
332 return NULL;
333}
334
d9d166c2 335static struct mdk_personality *find_pers(int level, char *clevel)
2604b703
N		 336{
337 struct mdk_personality *pers;
d9d166c2
N		 338 list_for_each_entry(pers, &pers_list, list) {
339 if (level != LEVEL_NONE && pers->level == level)
2604b703 340 return pers;
d9d166c2
N		 341 if (strcmp(pers->name, clevel)==0)
342 return pers;
343 }
2604b703
N		 344 return NULL;
345}
346
77933d72 347static inline sector_t calc_dev_sboffset(struct block_device *bdev)
1da177e4
LT		 348{
349 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
350 return MD_NEW_SIZE_BLOCKS(size);
351}
352
353static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
354{
355 sector_t size;
356
357 size = rdev->sb_offset;
358
359 if (chunk_size)
360 size &= ~((sector_t)chunk_size/1024 - 1);
361 return size;
362}
363
364static int alloc_disk_sb(mdk_rdev_t * rdev)
365{
366 if (rdev->sb_page)
367 MD_BUG();
368
369 rdev->sb_page = alloc_page(GFP_KERNEL);
370 if (!rdev->sb_page) {
371 printk(KERN_ALERT "md: out of memory.\n");
372 return -EINVAL;
373 }
374
375 return 0;
376}
377
378static void free_disk_sb(mdk_rdev_t * rdev)
379{
380 if (rdev->sb_page) {
2d1f3b5d 381 put_page(rdev->sb_page);
1da177e4
LT		 382 rdev->sb_loaded = 0;
383 rdev->sb_page = NULL;
384 rdev->sb_offset = 0;
385 rdev->size = 0;
386 }
387}
388
389
6712ecf8 390static void super_written(struct bio *bio, int error)
7bfa19f2
N		 391{
392 mdk_rdev_t *rdev = bio->bi_private;
a9701a30 393 mddev_t *mddev = rdev->mddev;
7bfa19f2 394
3a0f5bbb
N		 395 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
396 printk("md: super_written gets error=%d, uptodate=%d\n",
397 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
398 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
a9701a30 399 md_error(mddev, rdev);
3a0f5bbb 400 }
7bfa19f2 401
a9701a30
N		 402 if (atomic_dec_and_test(&mddev->pending_writes))
403 wake_up(&mddev->sb_wait);
f8b58edf 404 bio_put(bio);
7bfa19f2
N		 405}
406
6712ecf8 407static void super_written_barrier(struct bio *bio, int error)
a9701a30
N		 408{
409 struct bio *bio2 = bio->bi_private;
410 mdk_rdev_t *rdev = bio2->bi_private;
411 mddev_t *mddev = rdev->mddev;
a9701a30
N		 412
413 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
414 error == -EOPNOTSUPP) {
415 unsigned long flags;
416 /* barriers don't appear to be supported :-( */
417 set_bit(BarriersNotsupp, &rdev->flags);
418 mddev->barriers_work = 0;
419 spin_lock_irqsave(&mddev->write_lock, flags);
420 bio2->bi_next = mddev->biolist;
421 mddev->biolist = bio2;
422 spin_unlock_irqrestore(&mddev->write_lock, flags);
423 wake_up(&mddev->sb_wait);
424 bio_put(bio);
6712ecf8
N		 425 } else {
426 bio_put(bio2);
427 bio->bi_private = rdev;
428 super_written(bio, error);
a9701a30 429 }
a9701a30
N		 430}
431
7bfa19f2
N		 432void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
433 sector_t sector, int size, struct page *page)
434{
435 /* write first size bytes of page to sector of rdev
436 * Increment mddev->pending_writes before returning
437 * and decrement it on completion, waking up sb_wait
438 * if zero is reached.
439 * If an error occurred, call md_error
a9701a30
N		 440 *
441 * As we might need to resubmit the request if BIO_RW_BARRIER
442 * causes ENOTSUPP, we allocate a spare bio...
7bfa19f2
N		 443 */
444 struct bio *bio = bio_alloc(GFP_NOIO, 1);
a9701a30 445 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
7bfa19f2
N		 446
447 bio->bi_bdev = rdev->bdev;
448 bio->bi_sector = sector;
449 bio_add_page(bio, page, size, 0);
450 bio->bi_private = rdev;
451 bio->bi_end_io = super_written;
a9701a30
N		 452 bio->bi_rw = rw;
453
7bfa19f2 454 atomic_inc(&mddev->pending_writes);
a9701a30
N		 455 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
456 struct bio *rbio;
457 rw |= (1<<BIO_RW_BARRIER);
458 rbio = bio_clone(bio, GFP_NOIO);
459 rbio->bi_private = bio;
460 rbio->bi_end_io = super_written_barrier;
461 submit_bio(rw, rbio);
462 } else
463 submit_bio(rw, bio);
464}
465
466void md_super_wait(mddev_t *mddev)
467{
468 /* wait for all superblock writes that were scheduled to complete.
469 * if any had to be retried (due to BARRIER problems), retry them
470 */
471 DEFINE_WAIT(wq);
472 for(;;) {
473 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
474 if (atomic_read(&mddev->pending_writes)==0)
475 break;
476 while (mddev->biolist) {
477 struct bio *bio;
478 spin_lock_irq(&mddev->write_lock);
479 bio = mddev->biolist;
480 mddev->biolist = bio->bi_next ;
481 bio->bi_next = NULL;
482 spin_unlock_irq(&mddev->write_lock);
483 submit_bio(bio->bi_rw, bio);
484 }
485 schedule();
486 }
487 finish_wait(&mddev->sb_wait, &wq);
7bfa19f2
N		 488}
489
6712ecf8 490static void bi_complete(struct bio *bio, int error)
1da177e4 491{
1da177e4 492 complete((struct completion*)bio->bi_private);
1da177e4
LT		 493}
494
a654b9d8 495int sync_page_io(struct block_device *bdev, sector_t sector, int size,
1da177e4
LT		 496 struct page *page, int rw)
497{
baaa2c51 498 struct bio *bio = bio_alloc(GFP_NOIO, 1);
1da177e4
LT		 499 struct completion event;
500 int ret;
501
502 rw |= (1 << BIO_RW_SYNC);
503
504 bio->bi_bdev = bdev;
505 bio->bi_sector = sector;
506 bio_add_page(bio, page, size, 0);
507 init_completion(&event);
508 bio->bi_private = &event;
509 bio->bi_end_io = bi_complete;
510 submit_bio(rw, bio);
511 wait_for_completion(&event);
512
513 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
514 bio_put(bio);
515 return ret;
516}
a8745db2 517EXPORT_SYMBOL_GPL(sync_page_io);
1da177e4 518
0002b271 519static int read_disk_sb(mdk_rdev_t * rdev, int size)
1da177e4
LT		 520{
521 char b[BDEVNAME_SIZE];
522 if (!rdev->sb_page) {
523 MD_BUG();
524 return -EINVAL;
525 }
526 if (rdev->sb_loaded)
527 return 0;
528
529
0002b271 530 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
1da177e4
LT		 531 goto fail;
532 rdev->sb_loaded = 1;
533 return 0;
534
535fail:
536 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
537 bdevname(rdev->bdev,b));
538 return -EINVAL;
539}
540
541static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
542{
543 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
544 (sb1->set_uuid1 == sb2->set_uuid1) &&
545 (sb1->set_uuid2 == sb2->set_uuid2) &&
546 (sb1->set_uuid3 == sb2->set_uuid3))
547
548 return 1;
549
550 return 0;
551}
552
553
554static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
555{
556 int ret;
557 mdp_super_t *tmp1, *tmp2;
558
559 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
560 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
561
562 if (!tmp1 || !tmp2) {
563 ret = 0;
564 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
565 goto abort;
566 }
567
568 *tmp1 = *sb1;
569 *tmp2 = *sb2;
570
571 /*
572 * nr_disks is not constant
573 */
574 tmp1->nr_disks = 0;
575 tmp2->nr_disks = 0;
576
577 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
578 ret = 0;
579 else
580 ret = 1;
581
582abort:
990a8baf
JJ		 583 kfree(tmp1);
584 kfree(tmp2);
1da177e4
LT		 585 return ret;
586}
587
4d167f09
N		 588
589static u32 md_csum_fold(u32 csum)
590{
591 csum = (csum & 0xffff) + (csum >> 16);
592 return (csum & 0xffff) + (csum >> 16);
593}
594
1da177e4
LT		 595static unsigned int calc_sb_csum(mdp_super_t * sb)
596{
4d167f09
N		 597 u64 newcsum = 0;
598 u32 *sb32 = (u32*)sb;
599 int i;
1da177e4
LT		 600 unsigned int disk_csum, csum;
601
602 disk_csum = sb->sb_csum;
603 sb->sb_csum = 0;
4d167f09
N		 604
605 for (i = 0; i < MD_SB_BYTES/4 ; i++)
606 newcsum += sb32[i];
607 csum = (newcsum & 0xffffffff) + (newcsum>>32);
608
609
610#ifdef CONFIG_ALPHA
611 /* This used to use csum_partial, which was wrong for several
612 * reasons including that different results are returned on
613 * different architectures. It isn't critical that we get exactly
614 * the same return value as before (we always csum_fold before
615 * testing, and that removes any differences). However as we
616 * know that csum_partial always returned a 16bit value on
617 * alphas, do a fold to maximise conformity to previous behaviour.
618 */
619 sb->sb_csum = md_csum_fold(disk_csum);
620#else
1da177e4 621 sb->sb_csum = disk_csum;
4d167f09 622#endif
1da177e4
LT		 623 return csum;
624}
625
626
627/*
628 * Handle superblock details.
629 * We want to be able to handle multiple superblock formats
630 * so we have a common interface to them all, and an array of
631 * different handlers.
632 * We rely on user-space to write the initial superblock, and support
633 * reading and updating of superblocks.
634 * Interface methods are:
635 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
636 * loads and validates a superblock on dev.
637 * if refdev != NULL, compare superblocks on both devices
638 * Return:
639 * 0 - dev has a superblock that is compatible with refdev
640 * 1 - dev has a superblock that is compatible and newer than refdev
641 * so dev should be used as the refdev in future
642 * -EINVAL superblock incompatible or invalid
643 * -othererror e.g. -EIO
644 *
645 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
646 * Verify that dev is acceptable into mddev.
647 * The first time, mddev->raid_disks will be 0, and data from
648 * dev should be merged in. Subsequent calls check that dev
649 * is new enough. Return 0 or -EINVAL
650 *
651 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
652 * Update the superblock for rdev with data in mddev
653 * This does not write to disc.
654 *
655 */
656
657struct super_type {
658 char *name;
659 struct module *owner;
660 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
661 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
662 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
663};
664
665/*
666 * load_super for 0.90.0
667 */
668static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
669{
670 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
671 mdp_super_t *sb;
672 int ret;
673 sector_t sb_offset;
674
675 /*
676 * Calculate the position of the superblock,
677 * it's at the end of the disk.
678 *
679 * It also happens to be a multiple of 4Kb.
680 */
681 sb_offset = calc_dev_sboffset(rdev->bdev);
682 rdev->sb_offset = sb_offset;
683
0002b271 684 ret = read_disk_sb(rdev, MD_SB_BYTES);
1da177e4
LT		 685 if (ret) return ret;
686
687 ret = -EINVAL;
688
689 bdevname(rdev->bdev, b);
690 sb = (mdp_super_t*)page_address(rdev->sb_page);
691
692 if (sb->md_magic != MD_SB_MAGIC) {
693 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
694 b);
695 goto abort;
696 }
697
698 if (sb->major_version != 0 ||
f6705578
N		 699 sb->minor_version < 90 ||
700 sb->minor_version > 91) {
1da177e4
LT		 701 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
702 sb->major_version, sb->minor_version,
703 b);
704 goto abort;
705 }
706
707 if (sb->raid_disks <= 0)
708 goto abort;
709
4d167f09 710 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1da177e4
LT		 711 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
712 b);
713 goto abort;
714 }
715
716 rdev->preferred_minor = sb->md_minor;
717 rdev->data_offset = 0;
0002b271 718 rdev->sb_size = MD_SB_BYTES;
1da177e4 719
e11e93fa
N		 720 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
721 if (sb->level != 1 && sb->level != 4
722 && sb->level != 5 && sb->level != 6
723 && sb->level != 10) {
724 /* FIXME use a better test */
725 printk(KERN_WARNING
726 "md: bitmaps not supported for this level.\n");
727 goto abort;
728 }
729 }
730
1da177e4
LT		 731 if (sb->level == LEVEL_MULTIPATH)
732 rdev->desc_nr = -1;
733 else
734 rdev->desc_nr = sb->this_disk.number;
735
9a7b2b0f 736 if (!refdev) {
1da177e4 737 ret = 1;
9a7b2b0f 738 } else {
1da177e4
LT		 739 __u64 ev1, ev2;
740 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
741 if (!uuid_equal(refsb, sb)) {
742 printk(KERN_WARNING "md: %s has different UUID to %s\n",
743 b, bdevname(refdev->bdev,b2));
744 goto abort;
745 }
746 if (!sb_equal(refsb, sb)) {
747 printk(KERN_WARNING "md: %s has same UUID"
748 " but different superblock to %s\n",
749 b, bdevname(refdev->bdev, b2));
750 goto abort;
751 }
752 ev1 = md_event(sb);
753 ev2 = md_event(refsb);
754 if (ev1 > ev2)
755 ret = 1;
756 else
757 ret = 0;
758 }
759 rdev->size = calc_dev_size(rdev, sb->chunk_size);
760
2bf071bf
N		 761 if (rdev->size < sb->size && sb->level > 1)
762 /* "this cannot possibly happen" ... */
763 ret = -EINVAL;
764
1da177e4
LT		 765 abort:
766 return ret;
767}
768
769/*
770 * validate_super for 0.90.0
771 */
772static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
773{
774 mdp_disk_t *desc;
775 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
07d84d10 776 __u64 ev1 = md_event(sb);
1da177e4 777
41158c7e 778 rdev->raid_disk = -1;
c5d79adb
N		 779 clear_bit(Faulty, &rdev->flags);
780 clear_bit(In_sync, &rdev->flags);
781 clear_bit(WriteMostly, &rdev->flags);
782 clear_bit(BarriersNotsupp, &rdev->flags);
783
1da177e4
LT		 784 if (mddev->raid_disks == 0) {
785 mddev->major_version = 0;
786 mddev->minor_version = sb->minor_version;
787 mddev->patch_version = sb->patch_version;
e691063a 788 mddev->external = 0;
1da177e4
LT		 789 mddev->chunk_size = sb->chunk_size;
790 mddev->ctime = sb->ctime;
791 mddev->utime = sb->utime;
792 mddev->level = sb->level;
d9d166c2 793 mddev->clevel[0] = 0;
1da177e4
LT		 794 mddev->layout = sb->layout;
795 mddev->raid_disks = sb->raid_disks;
796 mddev->size = sb->size;
07d84d10 797 mddev->events = ev1;
9223214e 798 mddev->bitmap_offset = 0;
36fa3063 799 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
1da177e4 800
f6705578
N		 801 if (mddev->minor_version >= 91) {
802 mddev->reshape_position = sb->reshape_position;
803 mddev->delta_disks = sb->delta_disks;
804 mddev->new_level = sb->new_level;
805 mddev->new_layout = sb->new_layout;
806 mddev->new_chunk = sb->new_chunk;
807 } else {
808 mddev->reshape_position = MaxSector;
809 mddev->delta_disks = 0;
810 mddev->new_level = mddev->level;
811 mddev->new_layout = mddev->layout;
812 mddev->new_chunk = mddev->chunk_size;
813 }
814
1da177e4
LT		 815 if (sb->state & (1<<MD_SB_CLEAN))
816 mddev->recovery_cp = MaxSector;
817 else {
818 if (sb->events_hi == sb->cp_events_hi &&
819 sb->events_lo == sb->cp_events_lo) {
820 mddev->recovery_cp = sb->recovery_cp;
821 } else
822 mddev->recovery_cp = 0;
823 }
824
825 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
826 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
827 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
828 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
829
830 mddev->max_disks = MD_SB_DISKS;
a654b9d8
N		 831
832 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
e11e93fa 833 mddev->bitmap_file == NULL)
36fa3063 834 mddev->bitmap_offset = mddev->default_bitmap_offset;
a654b9d8 835
41158c7e
N		 836 } else if (mddev->pers == NULL) {
837 /* Insist on good event counter while assembling */
1da177e4
LT		 838 ++ev1;
839 if (ev1 < mddev->events)
840 return -EINVAL;
41158c7e
N		 841 } else if (mddev->bitmap) {
842 /* if adding to array with a bitmap, then we can accept an
843 * older device ... but not too old.
844 */
41158c7e
N		 845 if (ev1 < mddev->bitmap->events_cleared)
846 return 0;
07d84d10
N		 847 } else {
848 if (ev1 < mddev->events)
849 /* just a hot-add of a new device, leave raid_disk at -1 */
850 return 0;
851 }
41158c7e 852
1da177e4 853 if (mddev->level != LEVEL_MULTIPATH) {
1da177e4
LT		 854 desc = sb->disks + rdev->desc_nr;
855
856 if (desc->state & (1<<MD_DISK_FAULTY))
b2d444d7 857 set_bit(Faulty, &rdev->flags);
7c7546cc
N		 858 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
859 desc->raid_disk < mddev->raid_disks */) {
b2d444d7 860 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 861 rdev->raid_disk = desc->raid_disk;
862 }
8ddf9efe
N		 863 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
864 set_bit(WriteMostly, &rdev->flags);
41158c7e 865 } else /* MULTIPATH are always insync */
b2d444d7 866 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 867 return 0;
868}
869
870/*
871 * sync_super for 0.90.0
872 */
873static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
874{
875 mdp_super_t *sb;
876 struct list_head *tmp;
877 mdk_rdev_t *rdev2;
878 int next_spare = mddev->raid_disks;
19133a42 879
1da177e4
LT		 880
881 /* make rdev->sb match mddev data..
882 *
883 * 1/ zero out disks
884 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
885 * 3/ any empty disks < next_spare become removed
886 *
887 * disks[0] gets initialised to REMOVED because
888 * we cannot be sure from other fields if it has
889 * been initialised or not.
890 */
891 int i;
892 int active=0, working=0,failed=0,spare=0,nr_disks=0;
893
61181565
N		 894 rdev->sb_size = MD_SB_BYTES;
895
1da177e4
LT		 896 sb = (mdp_super_t*)page_address(rdev->sb_page);
897
898 memset(sb, 0, sizeof(*sb));
899
900 sb->md_magic = MD_SB_MAGIC;
901 sb->major_version = mddev->major_version;
1da177e4
LT		 902 sb->patch_version = mddev->patch_version;
903 sb->gvalid_words = 0; /* ignored */
904 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
905 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
906 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
907 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
908
909 sb->ctime = mddev->ctime;
910 sb->level = mddev->level;
911 sb->size = mddev->size;
912 sb->raid_disks = mddev->raid_disks;
913 sb->md_minor = mddev->md_minor;
e691063a 914 sb->not_persistent = 0;
1da177e4
LT		 915 sb->utime = mddev->utime;
916 sb->state = 0;
917 sb->events_hi = (mddev->events>>32);
918 sb->events_lo = (u32)mddev->events;
919
f6705578
N		 920 if (mddev->reshape_position == MaxSector)
921 sb->minor_version = 90;
922 else {
923 sb->minor_version = 91;
924 sb->reshape_position = mddev->reshape_position;
925 sb->new_level = mddev->new_level;
926 sb->delta_disks = mddev->delta_disks;
927 sb->new_layout = mddev->new_layout;
928 sb->new_chunk = mddev->new_chunk;
929 }
930 mddev->minor_version = sb->minor_version;
1da177e4
LT		 931 if (mddev->in_sync)
932 {
933 sb->recovery_cp = mddev->recovery_cp;
934 sb->cp_events_hi = (mddev->events>>32);
935 sb->cp_events_lo = (u32)mddev->events;
936 if (mddev->recovery_cp == MaxSector)
937 sb->state = (1<< MD_SB_CLEAN);
938 } else
939 sb->recovery_cp = 0;
940
941 sb->layout = mddev->layout;
942 sb->chunk_size = mddev->chunk_size;
943
a654b9d8
N		 944 if (mddev->bitmap && mddev->bitmap_file == NULL)
945 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
946
1da177e4 947 sb->disks[0].state = (1<<MD_DISK_REMOVED);
d089c6af 948 rdev_for_each(rdev2, tmp, mddev) {
1da177e4 949 mdp_disk_t *d;
86e6ffdd 950 int desc_nr;
b2d444d7
N		 951 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
952 && !test_bit(Faulty, &rdev2->flags))
86e6ffdd 953 desc_nr = rdev2->raid_disk;
1da177e4 954 else
86e6ffdd 955 desc_nr = next_spare++;
19133a42 956 rdev2->desc_nr = desc_nr;
1da177e4
LT		 957 d = &sb->disks[rdev2->desc_nr];
958 nr_disks++;
959 d->number = rdev2->desc_nr;
960 d->major = MAJOR(rdev2->bdev->bd_dev);
961 d->minor = MINOR(rdev2->bdev->bd_dev);
b2d444d7
N		 962 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
963 && !test_bit(Faulty, &rdev2->flags))
1da177e4
LT		 964 d->raid_disk = rdev2->raid_disk;
965 else
966 d->raid_disk = rdev2->desc_nr; /* compatibility */
1be7892f 967 if (test_bit(Faulty, &rdev2->flags))
1da177e4 968 d->state = (1<<MD_DISK_FAULTY);
1be7892f 969 else if (test_bit(In_sync, &rdev2->flags)) {
1da177e4
LT		 970 d->state = (1<<MD_DISK_ACTIVE);
971 d->state |= (1<<MD_DISK_SYNC);
972 active++;
973 working++;
974 } else {
975 d->state = 0;
976 spare++;
977 working++;
978 }
8ddf9efe
N		 979 if (test_bit(WriteMostly, &rdev2->flags))
980 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4 981 }
1da177e4
LT		 982 /* now set the "removed" and "faulty" bits on any missing devices */
983 for (i=0 ; i < mddev->raid_disks ; i++) {
984 mdp_disk_t *d = &sb->disks[i];
985 if (d->state == 0 && d->number == 0) {
986 d->number = i;
987 d->raid_disk = i;
988 d->state = (1<<MD_DISK_REMOVED);
989 d->state |= (1<<MD_DISK_FAULTY);
990 failed++;
991 }
992 }
993 sb->nr_disks = nr_disks;
994 sb->active_disks = active;
995 sb->working_disks = working;
996 sb->failed_disks = failed;
997 sb->spare_disks = spare;
998
999 sb->this_disk = sb->disks[rdev->desc_nr];
1000 sb->sb_csum = calc_sb_csum(sb);
1001}
1002
1003/*
1004 * version 1 superblock
1005 */
1006
1c05b4bc 1007static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1da177e4 1008{
1c05b4bc
N		 1009 __le32 disk_csum;
1010 u32 csum;
1da177e4
LT		 1011 unsigned long long newcsum;
1012 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1c05b4bc 1013 __le32 *isuper = (__le32*)sb;
1da177e4
LT		 1014 int i;
1015
1016 disk_csum = sb->sb_csum;
1017 sb->sb_csum = 0;
1018 newcsum = 0;
1019 for (i=0; size>=4; size -= 4 )
1020 newcsum += le32_to_cpu(*isuper++);
1021
1022 if (size == 2)
1c05b4bc 1023 newcsum += le16_to_cpu(*(__le16*) isuper);
1da177e4
LT		 1024
1025 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1026 sb->sb_csum = disk_csum;
1027 return cpu_to_le32(csum);
1028}
1029
1030static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1031{
1032 struct mdp_superblock_1 *sb;
1033 int ret;
1034 sector_t sb_offset;
1035 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 1036 int bmask;
1da177e4
LT		 1037
1038 /*
1039 * Calculate the position of the superblock.
1040 * It is always aligned to a 4K boundary and
1041 * depeding on minor_version, it can be:
1042 * 0: At least 8K, but less than 12K, from end of device
1043 * 1: At start of device
1044 * 2: 4K from start of device.
1045 */
1046 switch(minor_version) {
1047 case 0:
1048 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1049 sb_offset -= 8*2;
39730960 1050 sb_offset &= ~(sector_t)(4*2-1);
1da177e4
LT		 1051 /* convert from sectors to K */
1052 sb_offset /= 2;
1053 break;
1054 case 1:
1055 sb_offset = 0;
1056 break;
1057 case 2:
1058 sb_offset = 4;
1059 break;
1060 default:
1061 return -EINVAL;
1062 }
1063 rdev->sb_offset = sb_offset;
1064
0002b271
N		 1065 /* superblock is rarely larger than 1K, but it can be larger,
1066 * and it is safe to read 4k, so we do that
1067 */
1068 ret = read_disk_sb(rdev, 4096);
1da177e4
LT		 1069 if (ret) return ret;
1070
1071
1072 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1073
1074 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1075 sb->major_version != cpu_to_le32(1) ||
1076 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1077 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
71c0805c 1078 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT		 1079 return -EINVAL;
1080
1081 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1082 printk("md: invalid superblock checksum on %s\n",
1083 bdevname(rdev->bdev,b));
1084 return -EINVAL;
1085 }
1086 if (le64_to_cpu(sb->data_size) < 10) {
1087 printk("md: data_size too small on %s\n",
1088 bdevname(rdev->bdev,b));
1089 return -EINVAL;
1090 }
e11e93fa
N		 1091 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1092 if (sb->level != cpu_to_le32(1) &&
1093 sb->level != cpu_to_le32(4) &&
1094 sb->level != cpu_to_le32(5) &&
1095 sb->level != cpu_to_le32(6) &&
1096 sb->level != cpu_to_le32(10)) {
1097 printk(KERN_WARNING
1098 "md: bitmaps not supported for this level.\n");
1099 return -EINVAL;
1100 }
1101 }
1102
1da177e4
LT		 1103 rdev->preferred_minor = 0xffff;
1104 rdev->data_offset = le64_to_cpu(sb->data_offset);
4dbcdc75 1105 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1da177e4 1106
0002b271 1107 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
720a3dc3 1108 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
0002b271 1109 if (rdev->sb_size & bmask)
a1801f85
N		 1110 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1111
1112 if (minor_version
1113 && rdev->data_offset < sb_offset + (rdev->sb_size/512))
1114 return -EINVAL;
0002b271 1115
31b65a0d
N		 1116 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1117 rdev->desc_nr = -1;
1118 else
1119 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1120
9a7b2b0f 1121 if (!refdev) {
8ed75463 1122 ret = 1;
9a7b2b0f 1123 } else {
1da177e4
LT		 1124 __u64 ev1, ev2;
1125 struct mdp_superblock_1 *refsb =
1126 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1127
1128 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1129 sb->level != refsb->level ||
1130 sb->layout != refsb->layout ||
1131 sb->chunksize != refsb->chunksize) {
1132 printk(KERN_WARNING "md: %s has strangely different"
1133 " superblock to %s\n",
1134 bdevname(rdev->bdev,b),
1135 bdevname(refdev->bdev,b2));
1136 return -EINVAL;
1137 }
1138 ev1 = le64_to_cpu(sb->events);
1139 ev2 = le64_to_cpu(refsb->events);
1140
1141 if (ev1 > ev2)
8ed75463
N		 1142 ret = 1;
1143 else
1144 ret = 0;
1da177e4 1145 }
a1801f85 1146 if (minor_version)
1da177e4
LT		 1147 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1148 else
1149 rdev->size = rdev->sb_offset;
1150 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1151 return -EINVAL;
1152 rdev->size = le64_to_cpu(sb->data_size)/2;
1153 if (le32_to_cpu(sb->chunksize))
1154 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
2bf071bf 1155
1c05b4bc 1156 if (le64_to_cpu(sb->size) > rdev->size*2)
2bf071bf 1157 return -EINVAL;
8ed75463 1158 return ret;
1da177e4
LT		 1159}
1160
1161static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1162{
1163 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
07d84d10 1164 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4 1165
41158c7e 1166 rdev->raid_disk = -1;
c5d79adb
N		 1167 clear_bit(Faulty, &rdev->flags);
1168 clear_bit(In_sync, &rdev->flags);
1169 clear_bit(WriteMostly, &rdev->flags);
1170 clear_bit(BarriersNotsupp, &rdev->flags);
1171
1da177e4
LT		 1172 if (mddev->raid_disks == 0) {
1173 mddev->major_version = 1;
1174 mddev->patch_version = 0;
e691063a 1175 mddev->external = 0;
1da177e4
LT		 1176 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1177 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1178 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1179 mddev->level = le32_to_cpu(sb->level);
d9d166c2 1180 mddev->clevel[0] = 0;
1da177e4
LT		 1181 mddev->layout = le32_to_cpu(sb->layout);
1182 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1183 mddev->size = le64_to_cpu(sb->size)/2;
07d84d10 1184 mddev->events = ev1;
9223214e 1185 mddev->bitmap_offset = 0;
29fc7e3e 1186 mddev->default_bitmap_offset = 1024 >> 9;
1da177e4
LT		 1187
1188 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1189 memcpy(mddev->uuid, sb->set_uuid, 16);
1190
1191 mddev->max_disks = (4096-256)/2;
a654b9d8 1192
71c0805c 1193 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
e11e93fa 1194 mddev->bitmap_file == NULL )
a654b9d8 1195 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
e11e93fa 1196
f6705578
N		 1197 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1198 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1199 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1200 mddev->new_level = le32_to_cpu(sb->new_level);
1201 mddev->new_layout = le32_to_cpu(sb->new_layout);
1202 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1203 } else {
1204 mddev->reshape_position = MaxSector;
1205 mddev->delta_disks = 0;
1206 mddev->new_level = mddev->level;
1207 mddev->new_layout = mddev->layout;
1208 mddev->new_chunk = mddev->chunk_size;
1209 }
1210
41158c7e
N		 1211 } else if (mddev->pers == NULL) {
1212 /* Insist of good event counter while assembling */
1da177e4
LT		 1213 ++ev1;
1214 if (ev1 < mddev->events)
1215 return -EINVAL;
41158c7e
N		 1216 } else if (mddev->bitmap) {
1217 /* If adding to array with a bitmap, then we can accept an
1218 * older device, but not too old.
1219 */
41158c7e
N		 1220 if (ev1 < mddev->bitmap->events_cleared)
1221 return 0;
07d84d10
N		 1222 } else {
1223 if (ev1 < mddev->events)
1224 /* just a hot-add of a new device, leave raid_disk at -1 */
1225 return 0;
1226 }
1da177e4
LT		 1227 if (mddev->level != LEVEL_MULTIPATH) {
1228 int role;
1da177e4
LT		 1229 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1230 switch(role) {
1231 case 0xffff: /* spare */
1da177e4
LT		 1232 break;
1233 case 0xfffe: /* faulty */
b2d444d7 1234 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 1235 break;
1236 default:
5fd6c1dc
N		 1237 if ((le32_to_cpu(sb->feature_map) &
1238 MD_FEATURE_RECOVERY_OFFSET))
1239 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1240 else
1241 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1242 rdev->raid_disk = role;
1243 break;
1244 }
8ddf9efe
N		 1245 if (sb->devflags & WriteMostly1)
1246 set_bit(WriteMostly, &rdev->flags);
41158c7e 1247 } else /* MULTIPATH are always insync */
b2d444d7 1248 set_bit(In_sync, &rdev->flags);
41158c7e 1249
1da177e4
LT		 1250 return 0;
1251}
1252
1253static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1254{
1255 struct mdp_superblock_1 *sb;
1256 struct list_head *tmp;
1257 mdk_rdev_t *rdev2;
1258 int max_dev, i;
1259 /* make rdev->sb match mddev and rdev data. */
1260
1261 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1262
1263 sb->feature_map = 0;
1264 sb->pad0 = 0;
5fd6c1dc 1265 sb->recovery_offset = cpu_to_le64(0);
1da177e4
LT		 1266 memset(sb->pad1, 0, sizeof(sb->pad1));
1267 memset(sb->pad2, 0, sizeof(sb->pad2));
1268 memset(sb->pad3, 0, sizeof(sb->pad3));
1269
1270 sb->utime = cpu_to_le64((__u64)mddev->utime);
1271 sb->events = cpu_to_le64(mddev->events);
1272 if (mddev->in_sync)
1273 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1274 else
1275 sb->resync_offset = cpu_to_le64(0);
1276
1c05b4bc 1277 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
4dbcdc75 1278
f0ca340c 1279 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
29fc7e3e 1280 sb->size = cpu_to_le64(mddev->size<<1);
f0ca340c 1281
a654b9d8
N		 1282 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1283 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
71c0805c 1284 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8 1285 }
5fd6c1dc
N		 1286
1287 if (rdev->raid_disk >= 0 &&
1288 !test_bit(In_sync, &rdev->flags) &&
1289 rdev->recovery_offset > 0) {
1290 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1291 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1292 }
1293
f6705578
N		 1294 if (mddev->reshape_position != MaxSector) {
1295 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1296 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1297 sb->new_layout = cpu_to_le32(mddev->new_layout);
1298 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1299 sb->new_level = cpu_to_le32(mddev->new_level);
1300 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1301 }
a654b9d8 1302
1da177e4 1303 max_dev = 0;
d089c6af 1304 rdev_for_each(rdev2, tmp, mddev)
1da177e4
LT		 1305 if (rdev2->desc_nr+1 > max_dev)
1306 max_dev = rdev2->desc_nr+1;
a778b73f
N		 1307
1308 if (max_dev > le32_to_cpu(sb->max_dev))
1309 sb->max_dev = cpu_to_le32(max_dev);
1da177e4
LT		 1310 for (i=0; i<max_dev;i++)
1311 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1312
d089c6af 1313 rdev_for_each(rdev2, tmp, mddev) {
1da177e4 1314 i = rdev2->desc_nr;
b2d444d7 1315 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1316 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1317 else if (test_bit(In_sync, &rdev2->flags))
1da177e4 1318 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
5fd6c1dc
N		 1319 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1320 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1da177e4
LT		 1321 else
1322 sb->dev_roles[i] = cpu_to_le16(0xffff);
1323 }
1324
1da177e4
LT		 1325 sb->sb_csum = calc_sb_1_csum(sb);
1326}
1327
1328
75c96f85 1329static struct super_type super_types[] = {
1da177e4
LT		 1330 [0] = {
1331 .name = "0.90.0",
1332 .owner = THIS_MODULE,
1333 .load_super = super_90_load,
1334 .validate_super = super_90_validate,
1335 .sync_super = super_90_sync,
1336 },
1337 [1] = {
1338 .name = "md-1",
1339 .owner = THIS_MODULE,
1340 .load_super = super_1_load,
1341 .validate_super = super_1_validate,
1342 .sync_super = super_1_sync,
1343 },
1344};
1da177e4
LT		 1345
1346static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1347{
7dd5e7c3
N		 1348 struct list_head *tmp, *tmp2;
1349 mdk_rdev_t *rdev, *rdev2;
1da177e4 1350
d089c6af
N		 1351 rdev_for_each(rdev, tmp, mddev1)
1352 rdev_for_each(rdev2, tmp2, mddev2)
7dd5e7c3
N		 1353 if (rdev->bdev->bd_contains ==
1354 rdev2->bdev->bd_contains)
1355 return 1;
1da177e4
LT		 1356
1357 return 0;
1358}
1359
1360static LIST_HEAD(pending_raid_disks);
1361
1362static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1363{
7dd5e7c3 1364 char b[BDEVNAME_SIZE];
f637b9f9 1365 struct kobject *ko;
1edf80d3 1366 char *s;
5e55e2f5 1367 int err;
1da177e4
LT		 1368
1369 if (rdev->mddev) {
1370 MD_BUG();
1371 return -EINVAL;
1372 }
11e2ede0
DW		 1373
1374 /* prevent duplicates */
1375 if (find_rdev(mddev, rdev->bdev->bd_dev))
1376 return -EEXIST;
1377
2bf071bf
N		 1378 /* make sure rdev->size exceeds mddev->size */
1379 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
a778b73f
N		 1380 if (mddev->pers) {
1381 /* Cannot change size, so fail
1382 * If mddev->level <= 0, then we don't care
1383 * about aligning sizes (e.g. linear)
1384 */
1385 if (mddev->level > 0)
1386 return -ENOSPC;
1387 } else
2bf071bf
N		 1388 mddev->size = rdev->size;
1389 }
1da177e4
LT		 1390
1391 /* Verify rdev->desc_nr is unique.
1392 * If it is -1, assign a free number, else
1393 * check number is not in use
1394 */
1395 if (rdev->desc_nr < 0) {
1396 int choice = 0;
1397 if (mddev->pers) choice = mddev->raid_disks;
1398 while (find_rdev_nr(mddev, choice))
1399 choice++;
1400 rdev->desc_nr = choice;
1401 } else {
1402 if (find_rdev_nr(mddev, rdev->desc_nr))
1403 return -EBUSY;
1404 }
19133a42 1405 bdevname(rdev->bdev,b);
649316b2 1406 while ( (s=strchr(b, '/')) != NULL)
1edf80d3 1407 *s = '!';
649316b2 1408
1da177e4 1409 rdev->mddev = mddev;
19133a42 1410 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 1411
b2d6db58 1412 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
5e55e2f5 1413 goto fail;
86e6ffdd 1414
f637b9f9 1415 if (rdev->bdev->bd_part)
edfaa7c3 1416 ko = &rdev->bdev->bd_part->dev.kobj;
f637b9f9 1417 else
edfaa7c3 1418 ko = &rdev->bdev->bd_disk->dev.kobj;
5e55e2f5
N		 1419 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1420 kobject_del(&rdev->kobj);
1421 goto fail;
1422 }
1423 list_add(&rdev->same_set, &mddev->disks);
c5d79adb 1424 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1da177e4 1425 return 0;
5e55e2f5
N		 1426
1427 fail:
1428 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1429 b, mdname(mddev));
1430 return err;
1da177e4
LT		 1431}
1432
177a99b2 1433static void md_delayed_delete(struct work_struct *ws)
5792a285
N		 1434{
1435 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1436 kobject_del(&rdev->kobj);
177a99b2 1437 kobject_put(&rdev->kobj);
5792a285
N		 1438}
1439
1da177e4
LT		 1440static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1441{
1442 char b[BDEVNAME_SIZE];
1443 if (!rdev->mddev) {
1444 MD_BUG();
1445 return;
1446 }
5463c790 1447 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1da177e4
LT		 1448 list_del_init(&rdev->same_set);
1449 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1450 rdev->mddev = NULL;
86e6ffdd 1451 sysfs_remove_link(&rdev->kobj, "block");
5792a285
N		 1452
1453 /* We need to delay this, otherwise we can deadlock when
1454 * writing to 'remove' to "dev/state"
1455 */
177a99b2
N		 1456 INIT_WORK(&rdev->del_work, md_delayed_delete);
1457 kobject_get(&rdev->kobj);
5792a285 1458 schedule_work(&rdev->del_work);
1da177e4
LT		 1459}
1460
1461/*
1462 * prevent the device from being mounted, repartitioned or
1463 * otherwise reused by a RAID array (or any other kernel
1464 * subsystem), by bd_claiming the device.
1465 */
c5d79adb 1466static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1da177e4
LT		 1467{
1468 int err = 0;
1469 struct block_device *bdev;
1470 char b[BDEVNAME_SIZE];
1471
2e7b651d 1472 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1da177e4
LT		 1473 if (IS_ERR(bdev)) {
1474 printk(KERN_ERR "md: could not open %s.\n",
1475 __bdevname(dev, b));
1476 return PTR_ERR(bdev);
1477 }
c5d79adb 1478 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1da177e4
LT		 1479 if (err) {
1480 printk(KERN_ERR "md: could not bd_claim %s.\n",
1481 bdevname(bdev, b));
2e7b651d 1482 blkdev_put(bdev);
1da177e4
LT		 1483 return err;
1484 }
c5d79adb
N		 1485 if (!shared)
1486 set_bit(AllReserved, &rdev->flags);
1da177e4
LT		 1487 rdev->bdev = bdev;
1488 return err;
1489}
1490
1491static void unlock_rdev(mdk_rdev_t *rdev)
1492{
1493 struct block_device *bdev = rdev->bdev;
1494 rdev->bdev = NULL;
1495 if (!bdev)
1496 MD_BUG();
1497 bd_release(bdev);
2e7b651d 1498 blkdev_put(bdev);
1da177e4
LT		 1499}
1500
1501void md_autodetect_dev(dev_t dev);
1502
1503static void export_rdev(mdk_rdev_t * rdev)
1504{
1505 char b[BDEVNAME_SIZE];
1506 printk(KERN_INFO "md: export_rdev(%s)\n",
1507 bdevname(rdev->bdev,b));
1508 if (rdev->mddev)
1509 MD_BUG();
1510 free_disk_sb(rdev);
1511 list_del_init(&rdev->same_set);
1512#ifndef MODULE
d0fae18f
N		 1513 if (test_bit(AutoDetected, &rdev->flags))
1514 md_autodetect_dev(rdev->bdev->bd_dev);
1da177e4
LT		 1515#endif
1516 unlock_rdev(rdev);
86e6ffdd 1517 kobject_put(&rdev->kobj);
1da177e4
LT		 1518}
1519
1520static void kick_rdev_from_array(mdk_rdev_t * rdev)
1521{
1522 unbind_rdev_from_array(rdev);
1523 export_rdev(rdev);
1524}
1525
1526static void export_array(mddev_t *mddev)
1527{
1528 struct list_head *tmp;
1529 mdk_rdev_t *rdev;
1530
d089c6af 1531 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 1532 if (!rdev->mddev) {
1533 MD_BUG();
1534 continue;
1535 }
1536 kick_rdev_from_array(rdev);
1537 }
1538 if (!list_empty(&mddev->disks))
1539 MD_BUG();
1540 mddev->raid_disks = 0;
1541 mddev->major_version = 0;
1542}
1543
1544static void print_desc(mdp_disk_t *desc)
1545{
1546 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1547 desc->major,desc->minor,desc->raid_disk,desc->state);
1548}
1549
1550static void print_sb(mdp_super_t *sb)
1551{
1552 int i;
1553
1554 printk(KERN_INFO
1555 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1556 sb->major_version, sb->minor_version, sb->patch_version,
1557 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1558 sb->ctime);
1559 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1560 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1561 sb->md_minor, sb->layout, sb->chunk_size);
1562 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1563 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1564 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1565 sb->failed_disks, sb->spare_disks,
1566 sb->sb_csum, (unsigned long)sb->events_lo);
1567
1568 printk(KERN_INFO);
1569 for (i = 0; i < MD_SB_DISKS; i++) {
1570 mdp_disk_t *desc;
1571
1572 desc = sb->disks + i;
1573 if (desc->number || desc->major || desc->minor ||
1574 desc->raid_disk || (desc->state && (desc->state != 4))) {
1575 printk(" D %2d: ", i);
1576 print_desc(desc);
1577 }
1578 }
1579 printk(KERN_INFO "md: THIS: ");
1580 print_desc(&sb->this_disk);
1581
1582}
1583
1584static void print_rdev(mdk_rdev_t *rdev)
1585{
1586 char b[BDEVNAME_SIZE];
1587 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1588 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
b2d444d7
N		 1589 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1590 rdev->desc_nr);
1da177e4
LT		 1591 if (rdev->sb_loaded) {
1592 printk(KERN_INFO "md: rdev superblock:\n");
1593 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1594 } else
1595 printk(KERN_INFO "md: no rdev superblock!\n");
1596}
1597
5e56341d 1598static void md_print_devices(void)
1da177e4
LT		 1599{
1600 struct list_head *tmp, *tmp2;
1601 mdk_rdev_t *rdev;
1602 mddev_t *mddev;
1603 char b[BDEVNAME_SIZE];
1604
1605 printk("\n");
1606 printk("md: **********************************\n");
1607 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1608 printk("md: **********************************\n");
29ac4aa3 1609 for_each_mddev(mddev, tmp) {
1da177e4 1610
32a7627c
N		 1611 if (mddev->bitmap)
1612 bitmap_print_sb(mddev->bitmap);
1613 else
1614 printk("%s: ", mdname(mddev));
d089c6af 1615 rdev_for_each(rdev, tmp2, mddev)
1da177e4
LT		 1616 printk("<%s>", bdevname(rdev->bdev,b));
1617 printk("\n");
1618
d089c6af 1619 rdev_for_each(rdev, tmp2, mddev)
1da177e4
LT		 1620 print_rdev(rdev);
1621 }
1622 printk("md: **********************************\n");
1623 printk("\n");
1624}
1625
1626
42543769 1627static void sync_sbs(mddev_t * mddev, int nospares)
1da177e4 1628{
42543769
N		 1629 /* Update each superblock (in-memory image), but
1630 * if we are allowed to, skip spares which already
1631 * have the right event counter, or have one earlier
1632 * (which would mean they aren't being marked as dirty
1633 * with the rest of the array)
1634 */
1da177e4
LT		 1635 mdk_rdev_t *rdev;
1636 struct list_head *tmp;
1637
d089c6af 1638 rdev_for_each(rdev, tmp, mddev) {
42543769
N		 1639 if (rdev->sb_events == mddev->events ||
1640 (nospares &&
1641 rdev->raid_disk < 0 &&
1642 (rdev->sb_events&1)==0 &&
1643 rdev->sb_events+1 == mddev->events)) {
1644 /* Don't update this superblock */
1645 rdev->sb_loaded = 2;
1646 } else {
1647 super_types[mddev->major_version].
1648 sync_super(mddev, rdev);
1649 rdev->sb_loaded = 1;
1650 }
1da177e4
LT		 1651 }
1652}
1653
850b2b42 1654static void md_update_sb(mddev_t * mddev, int force_change)
1da177e4 1655{
1da177e4
LT		 1656 struct list_head *tmp;
1657 mdk_rdev_t *rdev;
06d91a5f 1658 int sync_req;
42543769 1659 int nospares = 0;
1da177e4 1660
8377bc80
N		 1661 if (mddev->external)
1662 return;
1da177e4 1663repeat:
a9701a30 1664 spin_lock_irq(&mddev->write_lock);
84692195 1665
850b2b42
N		 1666 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1667 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1668 force_change = 1;
1669 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1670 /* just a clean<-> dirty transition, possibly leave spares alone,
1671 * though if events isn't the right even/odd, we will have to do
1672 * spares after all
1673 */
1674 nospares = 1;
1675 if (force_change)
1676 nospares = 0;
1677 if (mddev->degraded)
84692195
N		 1678 /* If the array is degraded, then skipping spares is both
1679 * dangerous and fairly pointless.
1680 * Dangerous because a device that was removed from the array
1681 * might have a event_count that still looks up-to-date,
1682 * so it can be re-added without a resync.
1683 * Pointless because if there are any spares to skip,
1684 * then a recovery will happen and soon that array won't
1685 * be degraded any more and the spare can go back to sleep then.
1686 */
850b2b42 1687 nospares = 0;
84692195 1688
06d91a5f 1689 sync_req = mddev->in_sync;
1da177e4 1690 mddev->utime = get_seconds();
42543769
N		 1691
1692 /* If this is just a dirty<->clean transition, and the array is clean
1693 * and 'events' is odd, we can roll back to the previous clean state */
850b2b42 1694 if (nospares
42543769 1695 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1031be7a
N		 1696 && (mddev->events & 1)
1697 && mddev->events != 1)
42543769
N		 1698 mddev->events--;
1699 else {
1700 /* otherwise we have to go forward and ... */
1701 mddev->events ++;
1702 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1703 /* .. if the array isn't clean, insist on an odd 'events' */
1704 if ((mddev->events&1)==0) {
1705 mddev->events++;
1706 nospares = 0;
1707 }
1708 } else {
1709 /* otherwise insist on an even 'events' (for clean states) */
1710 if ((mddev->events&1)) {
1711 mddev->events++;
1712 nospares = 0;
1713 }
1714 }
1715 }
1da177e4
LT		 1716
1717 if (!mddev->events) {
1718 /*
1719 * oops, this 64-bit counter should never wrap.
1720 * Either we are in around ~1 trillion A.C., assuming
1721 * 1 reboot per second, or we have a bug:
1722 */
1723 MD_BUG();
1724 mddev->events --;
1725 }
1da177e4
LT		 1726
1727 /*
1728 * do not write anything to disk if using
1729 * nonpersistent superblocks
1730 */
06d91a5f 1731 if (!mddev->persistent) {
e691063a
N		 1732 if (!mddev->external)
1733 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1734
a9701a30 1735 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1736 wake_up(&mddev->sb_wait);
1da177e4 1737 return;
06d91a5f 1738 }
e691063a 1739 sync_sbs(mddev, nospares);
a9701a30 1740 spin_unlock_irq(&mddev->write_lock);
1da177e4
LT		 1741
1742 dprintk(KERN_INFO
1743 "md: updating %s RAID superblock on device (in sync %d)\n",
1744 mdname(mddev),mddev->in_sync);
1745
4ad13663 1746 bitmap_update_sb(mddev->bitmap);
d089c6af 1747 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 1748 char b[BDEVNAME_SIZE];
1749 dprintk(KERN_INFO "md: ");
42543769
N		 1750 if (rdev->sb_loaded != 1)
1751 continue; /* no noise on spare devices */
b2d444d7 1752 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1753 dprintk("(skipping faulty ");
1754
1755 dprintk("%s ", bdevname(rdev->bdev,b));
b2d444d7 1756 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 1757 md_super_write(mddev,rdev,
0002b271 1758 rdev->sb_offset<<1, rdev->sb_size,
7bfa19f2
N		 1759 rdev->sb_page);
1760 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1761 bdevname(rdev->bdev,b),
1762 (unsigned long long)rdev->sb_offset);
42543769 1763 rdev->sb_events = mddev->events;
7bfa19f2 1764
1da177e4
LT		 1765 } else
1766 dprintk(")\n");
7bfa19f2 1767 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT		 1768 /* only need to write one superblock... */
1769 break;
1770 }
a9701a30 1771 md_super_wait(mddev);
850b2b42 1772 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
7bfa19f2 1773
a9701a30 1774 spin_lock_irq(&mddev->write_lock);
850b2b42
N		 1775 if (mddev->in_sync != sync_req ||
1776 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
06d91a5f 1777 /* have to write it out again */
a9701a30 1778 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N		 1779 goto repeat;
1780 }
850b2b42 1781 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
a9701a30 1782 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1783 wake_up(&mddev->sb_wait);
06d91a5f 1784
1da177e4
LT		 1785}
1786
bce74dac
N		 1787/* words written to sysfs files may, or my not, be \n terminated.
1788 * We want to accept with case. For this we use cmd_match.
1789 */
1790static int cmd_match(const char *cmd, const char *str)
1791{
1792 /* See if cmd, written into a sysfs file, matches
1793 * str. They must either be the same, or cmd can
1794 * have a trailing newline
1795 */
1796 while (*cmd && *str && *cmd == *str) {
1797 cmd++;
1798 str++;
1799 }
1800 if (*cmd == '\n')
1801 cmd++;
1802 if (*str || *cmd)
1803 return 0;
1804 return 1;
1805}
1806
86e6ffdd
N		 1807struct rdev_sysfs_entry {
1808 struct attribute attr;
1809 ssize_t (*show)(mdk_rdev_t *, char *);
1810 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1811};
1812
1813static ssize_t
96de1e66 1814state_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1815{
1816 char *sep = "";
20a49ff6 1817 size_t len = 0;
86e6ffdd 1818
b2d444d7 1819 if (test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 1820 len+= sprintf(page+len, "%sfaulty",sep);
1821 sep = ",";
1822 }
b2d444d7 1823 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1824 len += sprintf(page+len, "%sin_sync",sep);
1825 sep = ",";
1826 }
f655675b
N		 1827 if (test_bit(WriteMostly, &rdev->flags)) {
1828 len += sprintf(page+len, "%swrite_mostly",sep);
1829 sep = ",";
1830 }
b2d444d7
N		 1831 if (!test_bit(Faulty, &rdev->flags) &&
1832 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1833 len += sprintf(page+len, "%sspare", sep);
1834 sep = ",";
1835 }
1836 return len+sprintf(page+len, "\n");
1837}
1838
45dc2de1
N		 1839static ssize_t
1840state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1841{
1842 /* can write
1843 * faulty - simulates and error
1844 * remove - disconnects the device
f655675b
N		 1845 * writemostly - sets write_mostly
1846 * -writemostly - clears write_mostly
45dc2de1
N		 1847 */
1848 int err = -EINVAL;
1849 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1850 md_error(rdev->mddev, rdev);
1851 err = 0;
1852 } else if (cmd_match(buf, "remove")) {
1853 if (rdev->raid_disk >= 0)
1854 err = -EBUSY;
1855 else {
1856 mddev_t *mddev = rdev->mddev;
1857 kick_rdev_from_array(rdev);
3f9d7b0d
N		 1858 if (mddev->pers)
1859 md_update_sb(mddev, 1);
45dc2de1
N		 1860 md_new_event(mddev);
1861 err = 0;
1862 }
f655675b
N		 1863 } else if (cmd_match(buf, "writemostly")) {
1864 set_bit(WriteMostly, &rdev->flags);
1865 err = 0;
1866 } else if (cmd_match(buf, "-writemostly")) {
1867 clear_bit(WriteMostly, &rdev->flags);
1868 err = 0;
45dc2de1
N		 1869 }
1870 return err ? err : len;
1871}
80ca3a44
N		 1872static struct rdev_sysfs_entry rdev_state =
1873__ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
86e6ffdd 1874
4dbcdc75
N		 1875static ssize_t
1876errors_show(mdk_rdev_t *rdev, char *page)
1877{
1878 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1879}
1880
1881static ssize_t
1882errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1883{
1884 char *e;
1885 unsigned long n = simple_strtoul(buf, &e, 10);
1886 if (*buf && (*e == 0 || *e == '\n')) {
1887 atomic_set(&rdev->corrected_errors, n);
1888 return len;
1889 }
1890 return -EINVAL;
1891}
1892static struct rdev_sysfs_entry rdev_errors =
80ca3a44 1893__ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
4dbcdc75 1894
014236d2
N		 1895static ssize_t
1896slot_show(mdk_rdev_t *rdev, char *page)
1897{
1898 if (rdev->raid_disk < 0)
1899 return sprintf(page, "none\n");
1900 else
1901 return sprintf(page, "%d\n", rdev->raid_disk);
1902}
1903
1904static ssize_t
1905slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1906{
1907 char *e;
c303da6d
N		 1908 int err;
1909 char nm[20];
014236d2
N		 1910 int slot = simple_strtoul(buf, &e, 10);
1911 if (strncmp(buf, "none", 4)==0)
1912 slot = -1;
1913 else if (e==buf || (*e && *e!= '\n'))
1914 return -EINVAL;
c303da6d
N		 1915 if (rdev->mddev->pers) {
1916 /* Setting 'slot' on an active array requires also
1917 * updating the 'rd%d' link, and communicating
1918 * with the personality with ->hot_*_disk.
1919 * For now we only support removing
1920 * failed/spare devices. This normally happens automatically,
1921 * but not when the metadata is externally managed.
1922 */
1923 if (slot != -1)
1924 return -EBUSY;
1925 if (rdev->raid_disk == -1)
1926 return -EEXIST;
1927 /* personality does all needed checks */
1928 if (rdev->mddev->pers->hot_add_disk == NULL)
1929 return -EINVAL;
1930 err = rdev->mddev->pers->
1931 hot_remove_disk(rdev->mddev, rdev->raid_disk);
1932 if (err)
1933 return err;
1934 sprintf(nm, "rd%d", rdev->raid_disk);
1935 sysfs_remove_link(&rdev->mddev->kobj, nm);
1936 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
1937 md_wakeup_thread(rdev->mddev->thread);
1938 } else {
1939 if (slot >= rdev->mddev->raid_disks)
1940 return -ENOSPC;
1941 rdev->raid_disk = slot;
1942 /* assume it is working */
c5d79adb
N		 1943 clear_bit(Faulty, &rdev->flags);
1944 clear_bit(WriteMostly, &rdev->flags);
c303da6d
N		 1945 set_bit(In_sync, &rdev->flags);
1946 }
014236d2
N		 1947 return len;
1948}
1949
1950
1951static struct rdev_sysfs_entry rdev_slot =
80ca3a44 1952__ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
014236d2 1953
93c8cad0
N		 1954static ssize_t
1955offset_show(mdk_rdev_t *rdev, char *page)
1956{
6961ece4 1957 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
93c8cad0
N		 1958}
1959
1960static ssize_t
1961offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1962{
1963 char *e;
1964 unsigned long long offset = simple_strtoull(buf, &e, 10);
1965 if (e==buf || (*e && *e != '\n'))
1966 return -EINVAL;
1967 if (rdev->mddev->pers)
1968 return -EBUSY;
c5d79adb
N		 1969 if (rdev->size && rdev->mddev->external)
1970 /* Must set offset before size, so overlap checks
1971 * can be sane */
1972 return -EBUSY;
93c8cad0
N		 1973 rdev->data_offset = offset;
1974 return len;
1975}
1976
1977static struct rdev_sysfs_entry rdev_offset =
80ca3a44 1978__ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
93c8cad0 1979
83303b61
N		 1980static ssize_t
1981rdev_size_show(mdk_rdev_t *rdev, char *page)
1982{
1983 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1984}
1985
c5d79adb
N		 1986static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
1987{
1988 /* check if two start/length pairs overlap */
1989 if (s1+l1 <= s2)
1990 return 0;
1991 if (s2+l2 <= s1)
1992 return 0;
1993 return 1;
1994}
1995
83303b61
N		 1996static ssize_t
1997rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1998{
1999 char *e;
2000 unsigned long long size = simple_strtoull(buf, &e, 10);
c5d79adb 2001 unsigned long long oldsize = rdev->size;
27c529bb
N		 2002 mddev_t *my_mddev = rdev->mddev;
2003
83303b61
N		 2004 if (e==buf || (*e && *e != '\n'))
2005 return -EINVAL;
27c529bb 2006 if (my_mddev->pers)
83303b61
N		 2007 return -EBUSY;
2008 rdev->size = size;
c5d79adb
N		 2009 if (size > oldsize && rdev->mddev->external) {
2010 /* need to check that all other rdevs with the same ->bdev
2011 * do not overlap. We need to unlock the mddev to avoid
2012 * a deadlock. We have already changed rdev->size, and if
2013 * we have to change it back, we will have the lock again.
2014 */
2015 mddev_t *mddev;
2016 int overlap = 0;
2017 struct list_head *tmp, *tmp2;
2018
27c529bb 2019 mddev_unlock(my_mddev);
29ac4aa3 2020 for_each_mddev(mddev, tmp) {
c5d79adb
N		 2021 mdk_rdev_t *rdev2;
2022
2023 mddev_lock(mddev);
d089c6af 2024 rdev_for_each(rdev2, tmp2, mddev)
c5d79adb
N		 2025 if (test_bit(AllReserved, &rdev2->flags) ||
2026 (rdev->bdev == rdev2->bdev &&
2027 rdev != rdev2 &&
2028 overlaps(rdev->data_offset, rdev->size,
2029 rdev2->data_offset, rdev2->size))) {
2030 overlap = 1;
2031 break;
2032 }
2033 mddev_unlock(mddev);
2034 if (overlap) {
2035 mddev_put(mddev);
2036 break;
2037 }
2038 }
27c529bb 2039 mddev_lock(my_mddev);
c5d79adb
N		 2040 if (overlap) {
2041 /* Someone else could have slipped in a size
2042 * change here, but doing so is just silly.
2043 * We put oldsize back because we *know* it is
2044 * safe, and trust userspace not to race with
2045 * itself
2046 */
2047 rdev->size = oldsize;
2048 return -EBUSY;
2049 }
2050 }
27c529bb
N		 2051 if (size < my_mddev->size || my_mddev->size == 0)
2052 my_mddev->size = size;
83303b61
N		 2053 return len;
2054}
2055
2056static struct rdev_sysfs_entry rdev_size =
80ca3a44 2057__ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
83303b61 2058
86e6ffdd
N		 2059static struct attribute *rdev_default_attrs[] = {
2060 &rdev_state.attr,
4dbcdc75 2061 &rdev_errors.attr,
014236d2 2062 &rdev_slot.attr,
93c8cad0 2063 &rdev_offset.attr,
83303b61 2064 &rdev_size.attr,
86e6ffdd
N		 2065 NULL,
2066};
2067static ssize_t
2068rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2069{
2070 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2071 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
27c529bb
N		 2072 mddev_t *mddev = rdev->mddev;
2073 ssize_t rv;
86e6ffdd
N		 2074
2075 if (!entry->show)
2076 return -EIO;
27c529bb
N		 2077
2078 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2079 if (!rv) {
2080 if (rdev->mddev == NULL)
2081 rv = -EBUSY;
2082 else
2083 rv = entry->show(rdev, page);
2084 mddev_unlock(mddev);
2085 }
2086 return rv;
86e6ffdd
N		 2087}
2088
2089static ssize_t
2090rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2091 const char *page, size_t length)
2092{
2093 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2094 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
27c529bb
N		 2095 ssize_t rv;
2096 mddev_t *mddev = rdev->mddev;
86e6ffdd
N		 2097
2098 if (!entry->store)
2099 return -EIO;
67463acb
N		 2100 if (!capable(CAP_SYS_ADMIN))
2101 return -EACCES;
27c529bb 2102 rv = mddev ? mddev_lock(mddev): -EBUSY;
ca388059 2103 if (!rv) {
27c529bb
N		 2104 if (rdev->mddev == NULL)
2105 rv = -EBUSY;
2106 else
2107 rv = entry->store(rdev, page, length);
6a51830e 2108 mddev_unlock(mddev);
ca388059
N		 2109 }
2110 return rv;
86e6ffdd
N		 2111}
2112
2113static void rdev_free(struct kobject *ko)
2114{
2115 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2116 kfree(rdev);
2117}
2118static struct sysfs_ops rdev_sysfs_ops = {
2119 .show = rdev_attr_show,
2120 .store = rdev_attr_store,
2121};
2122static struct kobj_type rdev_ktype = {
2123 .release = rdev_free,
2124 .sysfs_ops = &rdev_sysfs_ops,
2125 .default_attrs = rdev_default_attrs,
2126};
2127
1da177e4
LT		 2128/*
2129 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2130 *
2131 * mark the device faulty if:
2132 *
2133 * - the device is nonexistent (zero size)
2134 * - the device has no valid superblock
2135 *
2136 * a faulty rdev _never_ has rdev->sb set.
2137 */
2138static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2139{
2140 char b[BDEVNAME_SIZE];
2141 int err;
2142 mdk_rdev_t *rdev;
2143 sector_t size;
2144
9ffae0cf 2145 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1da177e4
LT		 2146 if (!rdev) {
2147 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2148 return ERR_PTR(-ENOMEM);
2149 }
1da177e4
LT		 2150
2151 if ((err = alloc_disk_sb(rdev)))
2152 goto abort_free;
2153
c5d79adb 2154 err = lock_rdev(rdev, newdev, super_format == -2);
1da177e4
LT		 2155 if (err)
2156 goto abort_free;
2157
f9cb074b 2158 kobject_init(&rdev->kobj, &rdev_ktype);
86e6ffdd 2159
1da177e4 2160 rdev->desc_nr = -1;
2b6e8459 2161 rdev->saved_raid_disk = -1;
3f9d7b0d 2162 rdev->raid_disk = -1;
b2d444d7 2163 rdev->flags = 0;
1da177e4 2164 rdev->data_offset = 0;
42543769 2165 rdev->sb_events = 0;
1da177e4 2166 atomic_set(&rdev->nr_pending, 0);
ba22dcbf 2167 atomic_set(&rdev->read_errors, 0);
4dbcdc75 2168 atomic_set(&rdev->corrected_errors, 0);
1da177e4
LT		 2169
2170 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2171 if (!size) {
2172 printk(KERN_WARNING
2173 "md: %s has zero or unknown size, marking faulty!\n",
2174 bdevname(rdev->bdev,b));
2175 err = -EINVAL;
2176 goto abort_free;
2177 }
2178
2179 if (super_format >= 0) {
2180 err = super_types[super_format].
2181 load_super(rdev, NULL, super_minor);
2182 if (err == -EINVAL) {
df968c4e
N		 2183 printk(KERN_WARNING
2184 "md: %s does not have a valid v%d.%d "
2185 "superblock, not importing!\n",
2186 bdevname(rdev->bdev,b),
2187 super_format, super_minor);
1da177e4
LT		 2188 goto abort_free;
2189 }
2190 if (err < 0) {
2191 printk(KERN_WARNING
2192 "md: could not read %s's sb, not importing!\n",
2193 bdevname(rdev->bdev,b));
2194 goto abort_free;
2195 }
2196 }
2197 INIT_LIST_HEAD(&rdev->same_set);
2198
2199 return rdev;
2200
2201abort_free:
2202 if (rdev->sb_page) {
2203 if (rdev->bdev)
2204 unlock_rdev(rdev);
2205 free_disk_sb(rdev);
2206 }
2207 kfree(rdev);
2208 return ERR_PTR(err);
2209}
2210
2211/*
2212 * Check a full RAID array for plausibility
2213 */
2214
2215
a757e64c 2216static void analyze_sbs(mddev_t * mddev)
1da177e4
LT		 2217{
2218 int i;
2219 struct list_head *tmp;
2220 mdk_rdev_t *rdev, *freshest;
2221 char b[BDEVNAME_SIZE];
2222
2223 freshest = NULL;
d089c6af 2224 rdev_for_each(rdev, tmp, mddev)
1da177e4
LT		 2225 switch (super_types[mddev->major_version].
2226 load_super(rdev, freshest, mddev->minor_version)) {
2227 case 1:
2228 freshest = rdev;
2229 break;
2230 case 0:
2231 break;
2232 default:
2233 printk( KERN_ERR \
2234 "md: fatal superblock inconsistency in %s"
2235 " -- removing from array\n",
2236 bdevname(rdev->bdev,b));
2237 kick_rdev_from_array(rdev);
2238 }
2239
2240
2241 super_types[mddev->major_version].
2242 validate_super(mddev, freshest);
2243
2244 i = 0;
d089c6af 2245 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 2246 if (rdev != freshest)
2247 if (super_types[mddev->major_version].
2248 validate_super(mddev, rdev)) {
2249 printk(KERN_WARNING "md: kicking non-fresh %s"
2250 " from array!\n",
2251 bdevname(rdev->bdev,b));
2252 kick_rdev_from_array(rdev);
2253 continue;
2254 }
2255 if (mddev->level == LEVEL_MULTIPATH) {
2256 rdev->desc_nr = i++;
2257 rdev->raid_disk = rdev->desc_nr;
b2d444d7 2258 set_bit(In_sync, &rdev->flags);
a778b73f
N		 2259 } else if (rdev->raid_disk >= mddev->raid_disks) {
2260 rdev->raid_disk = -1;
2261 clear_bit(In_sync, &rdev->flags);
1da177e4
LT		 2262 }
2263 }
2264
2265
2266
2267 if (mddev->recovery_cp != MaxSector &&
2268 mddev->level >= 1)
2269 printk(KERN_ERR "md: %s: raid array is not clean"
2270 " -- starting background reconstruction\n",
2271 mdname(mddev));
2272
1da177e4
LT		 2273}
2274
16f17b39
N		 2275static ssize_t
2276safe_delay_show(mddev_t *mddev, char *page)
2277{
2278 int msec = (mddev->safemode_delay*1000)/HZ;
2279 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2280}
2281static ssize_t
2282safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2283{
2284 int scale=1;
2285 int dot=0;
2286 int i;
2287 unsigned long msec;
2288 char buf[30];
2289 char *e;
2290 /* remove a period, and count digits after it */
2291 if (len >= sizeof(buf))
2292 return -EINVAL;
2293 strlcpy(buf, cbuf, len);
2294 buf[len] = 0;
2295 for (i=0; i<len; i++) {
2296 if (dot) {
2297 if (isdigit(buf[i])) {
2298 buf[i-1] = buf[i];
2299 scale *= 10;
2300 }
2301 buf[i] = 0;
2302 } else if (buf[i] == '.') {
2303 dot=1;
2304 buf[i] = 0;
2305 }
2306 }
2307 msec = simple_strtoul(buf, &e, 10);
2308 if (e == buf || (*e && *e != '\n'))
2309 return -EINVAL;
2310 msec = (msec * 1000) / scale;
2311 if (msec == 0)
2312 mddev->safemode_delay = 0;
2313 else {
2314 mddev->safemode_delay = (msec*HZ)/1000;
2315 if (mddev->safemode_delay == 0)
2316 mddev->safemode_delay = 1;
2317 }
2318 return len;
2319}
2320static struct md_sysfs_entry md_safe_delay =
80ca3a44 2321__ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
16f17b39 2322
eae1701f 2323static ssize_t
96de1e66 2324level_show(mddev_t *mddev, char *page)
eae1701f 2325{
2604b703 2326 struct mdk_personality *p = mddev->pers;
d9d166c2 2327 if (p)
eae1701f 2328 return sprintf(page, "%s\n", p->name);
d9d166c2
N		 2329 else if (mddev->clevel[0])
2330 return sprintf(page, "%s\n", mddev->clevel);
2331 else if (mddev->level != LEVEL_NONE)
2332 return sprintf(page, "%d\n", mddev->level);
2333 else
2334 return 0;
eae1701f
N		 2335}
2336
d9d166c2
N		 2337static ssize_t
2338level_store(mddev_t *mddev, const char *buf, size_t len)
2339{
20a49ff6 2340 ssize_t rv = len;
d9d166c2
N		 2341 if (mddev->pers)
2342 return -EBUSY;
2343 if (len == 0)
2344 return 0;
2345 if (len >= sizeof(mddev->clevel))
2346 return -ENOSPC;
2347 strncpy(mddev->clevel, buf, len);
2348 if (mddev->clevel[len-1] == '\n')
2349 len--;
2350 mddev->clevel[len] = 0;
2351 mddev->level = LEVEL_NONE;
2352 return rv;
2353}
2354
2355static struct md_sysfs_entry md_level =
80ca3a44 2356__ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
eae1701f 2357
d4dbd025
N		 2358
2359static ssize_t
2360layout_show(mddev_t *mddev, char *page)
2361{
2362 /* just a number, not meaningful for all levels */
08a02ecd
N		 2363 if (mddev->reshape_position != MaxSector &&
2364 mddev->layout != mddev->new_layout)
2365 return sprintf(page, "%d (%d)\n",
2366 mddev->new_layout, mddev->layout);
d4dbd025
N		 2367 return sprintf(page, "%d\n", mddev->layout);
2368}
2369
2370static ssize_t
2371layout_store(mddev_t *mddev, const char *buf, size_t len)
2372{
2373 char *e;
2374 unsigned long n = simple_strtoul(buf, &e, 10);
d4dbd025
N		 2375
2376 if (!*buf || (*e && *e != '\n'))
2377 return -EINVAL;
2378
08a02ecd
N		 2379 if (mddev->pers)
2380 return -EBUSY;
2381 if (mddev->reshape_position != MaxSector)
2382 mddev->new_layout = n;
2383 else
2384 mddev->layout = n;
d4dbd025
N		 2385 return len;
2386}
2387static struct md_sysfs_entry md_layout =
80ca3a44 2388__ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
d4dbd025
N		 2389
2390
eae1701f 2391static ssize_t
96de1e66 2392raid_disks_show(mddev_t *mddev, char *page)
eae1701f 2393{
bb636547
N		 2394 if (mddev->raid_disks == 0)
2395 return 0;
08a02ecd
N		 2396 if (mddev->reshape_position != MaxSector &&
2397 mddev->delta_disks != 0)
2398 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2399 mddev->raid_disks - mddev->delta_disks);
eae1701f
N		 2400 return sprintf(page, "%d\n", mddev->raid_disks);
2401}
2402
da943b99
N		 2403static int update_raid_disks(mddev_t *mddev, int raid_disks);
2404
2405static ssize_t
2406raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2407{
da943b99
N		 2408 char *e;
2409 int rv = 0;
2410 unsigned long n = simple_strtoul(buf, &e, 10);
2411
2412 if (!*buf || (*e && *e != '\n'))
2413 return -EINVAL;
2414
2415 if (mddev->pers)
2416 rv = update_raid_disks(mddev, n);
08a02ecd
N		 2417 else if (mddev->reshape_position != MaxSector) {
2418 int olddisks = mddev->raid_disks - mddev->delta_disks;
2419 mddev->delta_disks = n - olddisks;
2420 mddev->raid_disks = n;
2421 } else
da943b99
N		 2422 mddev->raid_disks = n;
2423 return rv ? rv : len;
2424}
2425static struct md_sysfs_entry md_raid_disks =
80ca3a44 2426__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
eae1701f 2427
3b34380a
N		 2428static ssize_t
2429chunk_size_show(mddev_t *mddev, char *page)
2430{
08a02ecd
N		 2431 if (mddev->reshape_position != MaxSector &&
2432 mddev->chunk_size != mddev->new_chunk)
2433 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2434 mddev->chunk_size);
3b34380a
N		 2435 return sprintf(page, "%d\n", mddev->chunk_size);
2436}
2437
2438static ssize_t
2439chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2440{
2441 /* can only set chunk_size if array is not yet active */
2442 char *e;
2443 unsigned long n = simple_strtoul(buf, &e, 10);
2444
3b34380a
N		 2445 if (!*buf || (*e && *e != '\n'))
2446 return -EINVAL;
2447
08a02ecd
N		 2448 if (mddev->pers)
2449 return -EBUSY;
2450 else if (mddev->reshape_position != MaxSector)
2451 mddev->new_chunk = n;
2452 else
2453 mddev->chunk_size = n;
3b34380a
N		 2454 return len;
2455}
2456static struct md_sysfs_entry md_chunk_size =
80ca3a44 2457__ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3b34380a 2458
a94213b1
N		 2459static ssize_t
2460resync_start_show(mddev_t *mddev, char *page)
2461{
2462 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2463}
2464
2465static ssize_t
2466resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2467{
a94213b1
N		 2468 char *e;
2469 unsigned long long n = simple_strtoull(buf, &e, 10);
2470
2471 if (mddev->pers)
2472 return -EBUSY;
2473 if (!*buf || (*e && *e != '\n'))
2474 return -EINVAL;
2475
2476 mddev->recovery_cp = n;
2477 return len;
2478}
2479static struct md_sysfs_entry md_resync_start =
80ca3a44 2480__ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
a94213b1 2481
9e653b63
N		 2482/*
2483 * The array state can be:
2484 *
2485 * clear
2486 * No devices, no size, no level
2487 * Equivalent to STOP_ARRAY ioctl
2488 * inactive
2489 * May have some settings, but array is not active
2490 * all IO results in error
2491 * When written, doesn't tear down array, but just stops it
2492 * suspended (not supported yet)
2493 * All IO requests will block. The array can be reconfigured.
2494 * Writing this, if accepted, will block until array is quiessent
2495 * readonly
2496 * no resync can happen. no superblocks get written.
2497 * write requests fail
2498 * read-auto
2499 * like readonly, but behaves like 'clean' on a write request.
2500 *
2501 * clean - no pending writes, but otherwise active.
2502 * When written to inactive array, starts without resync
2503 * If a write request arrives then
2504 * if metadata is known, mark 'dirty' and switch to 'active'.
2505 * if not known, block and switch to write-pending
2506 * If written to an active array that has pending writes, then fails.
2507 * active
2508 * fully active: IO and resync can be happening.
2509 * When written to inactive array, starts with resync
2510 *
2511 * write-pending
2512 * clean, but writes are blocked waiting for 'active' to be written.
2513 *
2514 * active-idle
2515 * like active, but no writes have been seen for a while (100msec).
2516 *
2517 */
2518enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2519 write_pending, active_idle, bad_word};
05381954 2520static char *array_states[] = {
9e653b63
N		 2521 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2522 "write-pending", "active-idle", NULL };
2523
2524static int match_word(const char *word, char **list)
2525{
2526 int n;
2527 for (n=0; list[n]; n++)
2528 if (cmd_match(word, list[n]))
2529 break;
2530 return n;
2531}
2532
2533static ssize_t
2534array_state_show(mddev_t *mddev, char *page)
2535{
2536 enum array_state st = inactive;
2537
2538 if (mddev->pers)
2539 switch(mddev->ro) {
2540 case 1:
2541 st = readonly;
2542 break;
2543 case 2:
2544 st = read_auto;
2545 break;
2546 case 0:
2547 if (mddev->in_sync)
2548 st = clean;
e691063a
N		 2549 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
2550 st = write_pending;
9e653b63
N		 2551 else if (mddev->safemode)
2552 st = active_idle;
2553 else
2554 st = active;
2555 }
2556 else {
2557 if (list_empty(&mddev->disks) &&
2558 mddev->raid_disks == 0 &&
2559 mddev->size == 0)
2560 st = clear;
2561 else
2562 st = inactive;
2563 }
2564 return sprintf(page, "%s\n", array_states[st]);
2565}
2566
2567static int do_md_stop(mddev_t * mddev, int ro);
2568static int do_md_run(mddev_t * mddev);
2569static int restart_array(mddev_t *mddev);
2570
2571static ssize_t
2572array_state_store(mddev_t *mddev, const char *buf, size_t len)
2573{
2574 int err = -EINVAL;
2575 enum array_state st = match_word(buf, array_states);
2576 switch(st) {
2577 case bad_word:
2578 break;
2579 case clear:
2580 /* stopping an active array */
e691063a
N		 2581 if (atomic_read(&mddev->active) > 1)
2582 return -EBUSY;
2583 err = do_md_stop(mddev, 0);
9e653b63
N		 2584 break;
2585 case inactive:
2586 /* stopping an active array */
2587 if (mddev->pers) {
2588 if (atomic_read(&mddev->active) > 1)
2589 return -EBUSY;
2590 err = do_md_stop(mddev, 2);
e691063a
N		 2591 } else
2592 err = 0; /* already inactive */
9e653b63
N		 2593 break;
2594 case suspended:
2595 break; /* not supported yet */
2596 case readonly:
2597 if (mddev->pers)
2598 err = do_md_stop(mddev, 1);
2599 else {
2600 mddev->ro = 1;
648b629e 2601 set_disk_ro(mddev->gendisk, 1);
9e653b63
N		 2602 err = do_md_run(mddev);
2603 }
2604 break;
2605 case read_auto:
9e653b63 2606 if (mddev->pers) {
648b629e
N		 2607 if (mddev->ro != 1)
2608 err = do_md_stop(mddev, 1);
2609 else
2610 err = restart_array(mddev);
2611 if (err == 0) {
2612 mddev->ro = 2;
2613 set_disk_ro(mddev->gendisk, 0);
2614 }
9e653b63
N		 2615 } else {
2616 mddev->ro = 2;
2617 err = do_md_run(mddev);
2618 }
2619 break;
2620 case clean:
2621 if (mddev->pers) {
2622 restart_array(mddev);
2623 spin_lock_irq(&mddev->write_lock);
2624 if (atomic_read(&mddev->writes_pending) == 0) {
e691063a
N		 2625 if (mddev->in_sync == 0) {
2626 mddev->in_sync = 1;
31a59e34
N		 2627 if (mddev->safemode == 1)
2628 mddev->safemode = 0;
e691063a
N		 2629 if (mddev->persistent)
2630 set_bit(MD_CHANGE_CLEAN,
2631 &mddev->flags);
2632 }
2633 err = 0;
2634 } else
2635 err = -EBUSY;
9e653b63
N		 2636 spin_unlock_irq(&mddev->write_lock);
2637 } else {
2638 mddev->ro = 0;
2639 mddev->recovery_cp = MaxSector;
2640 err = do_md_run(mddev);
2641 }
2642 break;
2643 case active:
2644 if (mddev->pers) {
2645 restart_array(mddev);
e691063a
N		 2646 if (mddev->external)
2647 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
9e653b63
N		 2648 wake_up(&mddev->sb_wait);
2649 err = 0;
2650 } else {
2651 mddev->ro = 0;
648b629e 2652 set_disk_ro(mddev->gendisk, 0);
9e653b63
N		 2653 err = do_md_run(mddev);
2654 }
2655 break;
2656 case write_pending:
2657 case active_idle:
2658 /* these cannot be set */
2659 break;
2660 }
2661 if (err)
2662 return err;
2663 else
2664 return len;
2665}
80ca3a44
N		 2666static struct md_sysfs_entry md_array_state =
2667__ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
9e653b63 2668
6d7ff738
N		 2669static ssize_t
2670null_show(mddev_t *mddev, char *page)
2671{
2672 return -EINVAL;
2673}
2674
2675static ssize_t
2676new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2677{
2678 /* buf must be %d:%d\n? giving major and minor numbers */
2679 /* The new device is added to the array.
2680 * If the array has a persistent superblock, we read the
2681 * superblock to initialise info and check validity.
2682 * Otherwise, only checking done is that in bind_rdev_to_array,
2683 * which mainly checks size.
2684 */
2685 char *e;
2686 int major = simple_strtoul(buf, &e, 10);
2687 int minor;
2688 dev_t dev;
2689 mdk_rdev_t *rdev;
2690 int err;
2691
2692 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2693 return -EINVAL;
2694 minor = simple_strtoul(e+1, &e, 10);
2695 if (*e && *e != '\n')
2696 return -EINVAL;
2697 dev = MKDEV(major, minor);
2698 if (major != MAJOR(dev) ||
2699 minor != MINOR(dev))
2700 return -EOVERFLOW;
2701
2702
2703 if (mddev->persistent) {
2704 rdev = md_import_device(dev, mddev->major_version,
2705 mddev->minor_version);
2706 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2707 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2708 mdk_rdev_t, same_set);
2709 err = super_types[mddev->major_version]
2710 .load_super(rdev, rdev0, mddev->minor_version);
2711 if (err < 0)
2712 goto out;
2713 }
c5d79adb
N		 2714 } else if (mddev->external)
2715 rdev = md_import_device(dev, -2, -1);
2716 else
6d7ff738
N		 2717 rdev = md_import_device(dev, -1, -1);
2718
2719 if (IS_ERR(rdev))
2720 return PTR_ERR(rdev);
2721 err = bind_rdev_to_array(rdev, mddev);
2722 out:
2723 if (err)
2724 export_rdev(rdev);
2725 return err ? err : len;
2726}
2727
2728static struct md_sysfs_entry md_new_device =
80ca3a44 2729__ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3b34380a 2730
9b1d1dac
PC		 2731static ssize_t
2732bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2733{
2734 char *end;
2735 unsigned long chunk, end_chunk;
2736
2737 if (!mddev->bitmap)
2738 goto out;
2739 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2740 while (*buf) {
2741 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2742 if (buf == end) break;
2743 if (*end == '-') { /* range */
2744 buf = end + 1;
2745 end_chunk = simple_strtoul(buf, &end, 0);
2746 if (buf == end) break;
2747 }
2748 if (*end && !isspace(*end)) break;
2749 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2750 buf = end;
2751 while (isspace(*buf)) buf++;
2752 }
2753 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2754out:
2755 return len;
2756}
2757
2758static struct md_sysfs_entry md_bitmap =
2759__ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2760
a35b0d69
N		 2761static ssize_t
2762size_show(mddev_t *mddev, char *page)
2763{
2764 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2765}
2766
2767static int update_size(mddev_t *mddev, unsigned long size);
2768
2769static ssize_t
2770size_store(mddev_t *mddev, const char *buf, size_t len)
2771{
2772 /* If array is inactive, we can reduce the component size, but
2773 * not increase it (except from 0).
2774 * If array is active, we can try an on-line resize
2775 */
2776 char *e;
2777 int err = 0;
2778 unsigned long long size = simple_strtoull(buf, &e, 10);
2779 if (!*buf || *buf == '\n' ||
2780 (*e && *e != '\n'))
2781 return -EINVAL;
2782
2783 if (mddev->pers) {
2784 err = update_size(mddev, size);
850b2b42 2785 md_update_sb(mddev, 1);
a35b0d69
N		 2786 } else {
2787 if (mddev->size == 0 ||
2788 mddev->size > size)
2789 mddev->size = size;
2790 else
2791 err = -ENOSPC;
2792 }
2793 return err ? err : len;
2794}
2795
2796static struct md_sysfs_entry md_size =
80ca3a44 2797__ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
a35b0d69 2798
8bb93aac
N		 2799
2800/* Metdata version.
e691063a
N		 2801 * This is one of
2802 * 'none' for arrays with no metadata (good luck...)
2803 * 'external' for arrays with externally managed metadata,
8bb93aac
N		 2804 * or N.M for internally known formats
2805 */
2806static ssize_t
2807metadata_show(mddev_t *mddev, char *page)
2808{
2809 if (mddev->persistent)
2810 return sprintf(page, "%d.%d\n",
2811 mddev->major_version, mddev->minor_version);
e691063a
N		 2812 else if (mddev->external)
2813 return sprintf(page, "external:%s\n", mddev->metadata_type);
8bb93aac
N		 2814 else
2815 return sprintf(page, "none\n");
2816}
2817
2818static ssize_t
2819metadata_store(mddev_t *mddev, const char *buf, size_t len)
2820{
2821 int major, minor;
2822 char *e;
2823 if (!list_empty(&mddev->disks))
2824 return -EBUSY;
2825
2826 if (cmd_match(buf, "none")) {
2827 mddev->persistent = 0;
e691063a
N		 2828 mddev->external = 0;
2829 mddev->major_version = 0;
2830 mddev->minor_version = 90;
2831 return len;
2832 }
2833 if (strncmp(buf, "external:", 9) == 0) {
20a49ff6 2834 size_t namelen = len-9;
e691063a
N		 2835 if (namelen >= sizeof(mddev->metadata_type))
2836 namelen = sizeof(mddev->metadata_type)-1;
2837 strncpy(mddev->metadata_type, buf+9, namelen);
2838 mddev->metadata_type[namelen] = 0;
2839 if (namelen && mddev->metadata_type[namelen-1] == '\n')
2840 mddev->metadata_type[--namelen] = 0;
2841 mddev->persistent = 0;
2842 mddev->external = 1;
8bb93aac
N		 2843 mddev->major_version = 0;
2844 mddev->minor_version = 90;
2845 return len;
2846 }
2847 major = simple_strtoul(buf, &e, 10);
2848 if (e==buf || *e != '.')
2849 return -EINVAL;
2850 buf = e+1;
2851 minor = simple_strtoul(buf, &e, 10);
3f9d7b0d 2852 if (e==buf || (*e && *e != '\n') )
8bb93aac 2853 return -EINVAL;
50511da3 2854 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
8bb93aac
N		 2855 return -ENOENT;
2856 mddev->major_version = major;
2857 mddev->minor_version = minor;
2858 mddev->persistent = 1;
e691063a 2859 mddev->external = 0;
8bb93aac
N		 2860 return len;
2861}
2862
2863static struct md_sysfs_entry md_metadata =
80ca3a44 2864__ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
8bb93aac 2865
24dd469d 2866static ssize_t
7eec314d 2867action_show(mddev_t *mddev, char *page)
24dd469d 2868{
7eec314d 2869 char *type = "idle";
31399d9e 2870 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2b12ab6d 2871 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
ccfcc3c1
N		 2872 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2873 type = "reshape";
2874 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N		 2875 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2876 type = "resync";
2877 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2878 type = "check";
2879 else
2880 type = "repair";
2881 } else
2882 type = "recover";
2883 }
2884 return sprintf(page, "%s\n", type);
2885}
2886
2887static ssize_t
7eec314d 2888action_store(mddev_t *mddev, const char *page, size_t len)
24dd469d 2889{
7eec314d
N		 2890 if (!mddev->pers || !mddev->pers->sync_request)
2891 return -EINVAL;
2892
bce74dac 2893 if (cmd_match(page, "idle")) {
7eec314d
N		 2894 if (mddev->sync_thread) {
2895 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2896 md_unregister_thread(mddev->sync_thread);
2897 mddev->sync_thread = NULL;
2898 mddev->recovery = 0;
2899 }
03c902e1
N		 2900 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2901 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 2902 return -EBUSY;
03c902e1 2903 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
7eec314d 2904 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
16484bf5
N		 2905 else if (cmd_match(page, "reshape")) {
2906 int err;
2907 if (mddev->pers->start_reshape == NULL)
2908 return -EINVAL;
2909 err = mddev->pers->start_reshape(mddev);
2910 if (err)
2911 return err;
2912 } else {
bce74dac 2913 if (cmd_match(page, "check"))
7eec314d 2914 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2adc7d47 2915 else if (!cmd_match(page, "repair"))
7eec314d
N		 2916 return -EINVAL;
2917 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2918 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7eec314d 2919 }
03c902e1 2920 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d
N		 2921 md_wakeup_thread(mddev->thread);
2922 return len;
2923}
2924
9d88883e 2925static ssize_t
96de1e66 2926mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 2927{
2928 return sprintf(page, "%llu\n",
2929 (unsigned long long) mddev->resync_mismatches);
2930}
2931
80ca3a44
N		 2932static struct md_sysfs_entry md_scan_mode =
2933__ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 2934
96de1e66 2935
80ca3a44 2936static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 2937
88202a0c
N		 2938static ssize_t
2939sync_min_show(mddev_t *mddev, char *page)
2940{
2941 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2942 mddev->sync_speed_min ? "local": "system");
2943}
2944
2945static ssize_t
2946sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2947{
2948 int min;
2949 char *e;
2950 if (strncmp(buf, "system", 6)==0) {
2951 mddev->sync_speed_min = 0;
2952 return len;
2953 }
2954 min = simple_strtoul(buf, &e, 10);
2955 if (buf == e || (*e && *e != '\n') || min <= 0)
2956 return -EINVAL;
2957 mddev->sync_speed_min = min;
2958 return len;
2959}
2960
2961static struct md_sysfs_entry md_sync_min =
2962__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2963
2964static ssize_t
2965sync_max_show(mddev_t *mddev, char *page)
2966{
2967 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2968 mddev->sync_speed_max ? "local": "system");
2969}
2970
2971static ssize_t
2972sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2973{
2974 int max;
2975 char *e;
2976 if (strncmp(buf, "system", 6)==0) {
2977 mddev->sync_speed_max = 0;
2978 return len;
2979 }
2980 max = simple_strtoul(buf, &e, 10);
2981 if (buf == e || (*e && *e != '\n') || max <= 0)
2982 return -EINVAL;
2983 mddev->sync_speed_max = max;
2984 return len;
2985}
2986
2987static struct md_sysfs_entry md_sync_max =
2988__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2989
d7f3d291
IP		 2990static ssize_t
2991degraded_show(mddev_t *mddev, char *page)
2992{
2993 return sprintf(page, "%d\n", mddev->degraded);
2994}
2995static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
88202a0c
N		 2996
2997static ssize_t
2998sync_speed_show(mddev_t *mddev, char *page)
2999{
3000 unsigned long resync, dt, db;
ff4e8d9a 3001 resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active));
88202a0c
N		 3002 dt = ((jiffies - mddev->resync_mark) / HZ);
3003 if (!dt) dt++;
3004 db = resync - (mddev->resync_mark_cnt);
3005 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
3006}
3007
80ca3a44 3008static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
88202a0c
N		 3009
3010static ssize_t
3011sync_completed_show(mddev_t *mddev, char *page)
3012{
3013 unsigned long max_blocks, resync;
3014
3015 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3016 max_blocks = mddev->resync_max_sectors;
3017 else
3018 max_blocks = mddev->size << 1;
3019
3020 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
3021 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
3022}
3023
80ca3a44 3024static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
88202a0c 3025
c6207277
N		 3026static ssize_t
3027max_sync_show(mddev_t *mddev, char *page)
3028{
3029 if (mddev->resync_max == MaxSector)
3030 return sprintf(page, "max\n");
3031 else
3032 return sprintf(page, "%llu\n",
3033 (unsigned long long)mddev->resync_max);
3034}
3035static ssize_t
3036max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3037{
3038 if (strncmp(buf, "max", 3) == 0)
3039 mddev->resync_max = MaxSector;
3040 else {
3041 char *ep;
3042 unsigned long long max = simple_strtoull(buf, &ep, 10);
3043 if (ep == buf || (*ep != 0 && *ep != '\n'))
3044 return -EINVAL;
3045 if (max < mddev->resync_max &&
3046 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3047 return -EBUSY;
3048
3049 /* Must be a multiple of chunk_size */
3050 if (mddev->chunk_size) {
3051 if (max & (sector_t)((mddev->chunk_size>>9)-1))
3052 return -EINVAL;
3053 }
3054 mddev->resync_max = max;
3055 }
3056 wake_up(&mddev->recovery_wait);
3057 return len;
3058}
3059
3060static struct md_sysfs_entry md_max_sync =
3061__ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3062
e464eafd
N		 3063static ssize_t
3064suspend_lo_show(mddev_t *mddev, char *page)
3065{
3066 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3067}
3068
3069static ssize_t
3070suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3071{
3072 char *e;
3073 unsigned long long new = simple_strtoull(buf, &e, 10);
3074
3075 if (mddev->pers->quiesce == NULL)
3076 return -EINVAL;
3077 if (buf == e || (*e && *e != '\n'))
3078 return -EINVAL;
3079 if (new >= mddev->suspend_hi ||
3080 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3081 mddev->suspend_lo = new;
3082 mddev->pers->quiesce(mddev, 2);
3083 return len;
3084 } else
3085 return -EINVAL;
3086}
3087static struct md_sysfs_entry md_suspend_lo =
3088__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3089
3090
3091static ssize_t
3092suspend_hi_show(mddev_t *mddev, char *page)
3093{
3094 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3095}
3096
3097static ssize_t
3098suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3099{
3100 char *e;
3101 unsigned long long new = simple_strtoull(buf, &e, 10);
3102
3103 if (mddev->pers->quiesce == NULL)
3104 return -EINVAL;
3105 if (buf == e || (*e && *e != '\n'))
3106 return -EINVAL;
3107 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3108 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3109 mddev->suspend_hi = new;
3110 mddev->pers->quiesce(mddev, 1);
3111 mddev->pers->quiesce(mddev, 0);
3112 return len;
3113 } else
3114 return -EINVAL;
3115}
3116static struct md_sysfs_entry md_suspend_hi =
3117__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3118
08a02ecd
N		 3119static ssize_t
3120reshape_position_show(mddev_t *mddev, char *page)
3121{
3122 if (mddev->reshape_position != MaxSector)
3123 return sprintf(page, "%llu\n",
3124 (unsigned long long)mddev->reshape_position);
3125 strcpy(page, "none\n");
3126 return 5;
3127}
3128
3129static ssize_t
3130reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3131{
3132 char *e;
3133 unsigned long long new = simple_strtoull(buf, &e, 10);
3134 if (mddev->pers)
3135 return -EBUSY;
3136 if (buf == e || (*e && *e != '\n'))
3137 return -EINVAL;
3138 mddev->reshape_position = new;
3139 mddev->delta_disks = 0;
3140 mddev->new_level = mddev->level;
3141 mddev->new_layout = mddev->layout;
3142 mddev->new_chunk = mddev->chunk_size;
3143 return len;
3144}
3145
3146static struct md_sysfs_entry md_reshape_position =
3147__ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3148 reshape_position_store);
3149
e464eafd 3150
eae1701f
N		 3151static struct attribute *md_default_attrs[] = {
3152 &md_level.attr,
d4dbd025 3153 &md_layout.attr,
eae1701f 3154 &md_raid_disks.attr,
3b34380a 3155 &md_chunk_size.attr,
a35b0d69 3156 &md_size.attr,
a94213b1 3157 &md_resync_start.attr,
8bb93aac 3158 &md_metadata.attr,
6d7ff738 3159 &md_new_device.attr,
16f17b39 3160 &md_safe_delay.attr,
9e653b63 3161 &md_array_state.attr,
08a02ecd 3162 &md_reshape_position.attr,
411036fa
N		 3163 NULL,
3164};
3165
3166static struct attribute *md_redundancy_attrs[] = {
24dd469d 3167 &md_scan_mode.attr,
9d88883e 3168 &md_mismatches.attr,
88202a0c
N		 3169 &md_sync_min.attr,
3170 &md_sync_max.attr,
3171 &md_sync_speed.attr,
3172 &md_sync_completed.attr,
c6207277 3173 &md_max_sync.attr,
e464eafd
N		 3174 &md_suspend_lo.attr,
3175 &md_suspend_hi.attr,
9b1d1dac 3176 &md_bitmap.attr,
d7f3d291 3177 &md_degraded.attr,
eae1701f
N		 3178 NULL,
3179};
411036fa
N		 3180static struct attribute_group md_redundancy_group = {
3181 .name = NULL,
3182 .attrs = md_redundancy_attrs,
3183};
3184
eae1701f
N		 3185
3186static ssize_t
3187md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3188{
3189 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3190 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 3191 ssize_t rv;
eae1701f
N		 3192
3193 if (!entry->show)
3194 return -EIO;
5dc5cf7d
IM		 3195 rv = mddev_lock(mddev);
3196 if (!rv) {
3197 rv = entry->show(mddev, page);
3198 mddev_unlock(mddev);
3199 }
96de1e66 3200 return rv;
eae1701f
N		 3201}
3202
3203static ssize_t
3204md_attr_store(struct kobject *kobj, struct attribute *attr,
3205 const char *page, size_t length)
3206{
3207 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3208 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 3209 ssize_t rv;
eae1701f
N		 3210
3211 if (!entry->store)
3212 return -EIO;
67463acb
N		 3213 if (!capable(CAP_SYS_ADMIN))
3214 return -EACCES;
5dc5cf7d
IM		 3215 rv = mddev_lock(mddev);
3216 if (!rv) {
3217 rv = entry->store(mddev, page, length);
3218 mddev_unlock(mddev);
3219 }
96de1e66 3220 return rv;
eae1701f
N		 3221}
3222
3223static void md_free(struct kobject *ko)
3224{
3225 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3226 kfree(mddev);
3227}
3228
3229static struct sysfs_ops md_sysfs_ops = {
3230 .show = md_attr_show,
3231 .store = md_attr_store,
3232};
3233static struct kobj_type md_ktype = {
3234 .release = md_free,
3235 .sysfs_ops = &md_sysfs_ops,
3236 .default_attrs = md_default_attrs,
3237};
3238
1da177e4
LT		 3239int mdp_major = 0;
3240
3241static struct kobject *md_probe(dev_t dev, int *part, void *data)
3242{
48c9c27b 3243 static DEFINE_MUTEX(disks_mutex);
1da177e4
LT		 3244 mddev_t *mddev = mddev_find(dev);
3245 struct gendisk *disk;
3246 int partitioned = (MAJOR(dev) != MD_MAJOR);
3247 int shift = partitioned ? MdpMinorShift : 0;
3248 int unit = MINOR(dev) >> shift;
3830c62f 3249 int error;
1da177e4
LT		 3250
3251 if (!mddev)
3252 return NULL;
3253
48c9c27b 3254 mutex_lock(&disks_mutex);
1da177e4 3255 if (mddev->gendisk) {
48c9c27b 3256 mutex_unlock(&disks_mutex);
1da177e4
LT		 3257 mddev_put(mddev);
3258 return NULL;
3259 }
3260 disk = alloc_disk(1 << shift);
3261 if (!disk) {
48c9c27b 3262 mutex_unlock(&disks_mutex);
1da177e4
LT		 3263 mddev_put(mddev);
3264 return NULL;
3265 }
3266 disk->major = MAJOR(dev);
3267 disk->first_minor = unit << shift;
ce7b0f46 3268 if (partitioned)
1da177e4 3269 sprintf(disk->disk_name, "md_d%d", unit);
ce7b0f46 3270 else
1da177e4 3271 sprintf(disk->disk_name, "md%d", unit);
1da177e4
LT		 3272 disk->fops = &md_fops;
3273 disk->private_data = mddev;
3274 disk->queue = mddev->queue;
3275 add_disk(disk);
3276 mddev->gendisk = disk;
48c9c27b 3277 mutex_unlock(&disks_mutex);
edfaa7c3 3278 error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj,
3830c62f
GKH		 3279 "%s", "md");
3280 if (error)
5e55e2f5
N		 3281 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3282 disk->disk_name);
3830c62f
GKH		 3283 else
3284 kobject_uevent(&mddev->kobj, KOBJ_ADD);
1da177e4
LT		 3285 return NULL;
3286}
3287
1da177e4
LT		 3288static void md_safemode_timeout(unsigned long data)
3289{
3290 mddev_t *mddev = (mddev_t *) data;
3291
3292 mddev->safemode = 1;
3293 md_wakeup_thread(mddev->thread);
3294}
3295
6ff8d8ec 3296static int start_dirty_degraded;
1da177e4
LT		 3297
3298static int do_md_run(mddev_t * mddev)
3299{
2604b703 3300 int err;
1da177e4
LT		 3301 int chunk_size;
3302 struct list_head *tmp;
3303 mdk_rdev_t *rdev;
3304 struct gendisk *disk;
2604b703 3305 struct mdk_personality *pers;
1da177e4
LT		 3306 char b[BDEVNAME_SIZE];
3307
a757e64c
N		 3308 if (list_empty(&mddev->disks))
3309 /* cannot run an array with no devices.. */
1da177e4 3310 return -EINVAL;
1da177e4
LT		 3311
3312 if (mddev->pers)
3313 return -EBUSY;
3314
3315 /*
3316 * Analyze all RAID superblock(s)
3317 */
1ec4a939
N		 3318 if (!mddev->raid_disks) {
3319 if (!mddev->persistent)
3320 return -EINVAL;
a757e64c 3321 analyze_sbs(mddev);
1ec4a939 3322 }
1da177e4
LT		 3323
3324 chunk_size = mddev->chunk_size;
2604b703
N		 3325
3326 if (chunk_size) {
1da177e4
LT		 3327 if (chunk_size > MAX_CHUNK_SIZE) {
3328 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3329 chunk_size, MAX_CHUNK_SIZE);
3330 return -EINVAL;
3331 }
3332 /*
3333 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3334 */
3335 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 3336 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 3337 return -EINVAL;
3338 }
3339 if (chunk_size < PAGE_SIZE) {
3340 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
3341 chunk_size, PAGE_SIZE);
3342 return -EINVAL;
3343 }
3344
3345 /* devices must have minimum size of one chunk */
d089c6af 3346 rdev_for_each(rdev, tmp, mddev) {
b2d444d7 3347 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3348 continue;
3349 if (rdev->size < chunk_size / 1024) {
3350 printk(KERN_WARNING
3351 "md: Dev %s smaller than chunk_size:"
3352 " %lluk < %dk\n",
3353 bdevname(rdev->bdev,b),
3354 (unsigned long long)rdev->size,
3355 chunk_size / 1024);
3356 return -EINVAL;
3357 }
3358 }
3359 }
3360
1da177e4 3361#ifdef CONFIG_KMOD
d9d166c2
N		 3362 if (mddev->level != LEVEL_NONE)
3363 request_module("md-level-%d", mddev->level);
3364 else if (mddev->clevel[0])
3365 request_module("md-%s", mddev->clevel);
1da177e4
LT		 3366#endif
3367
3368 /*
3369 * Drop all container device buffers, from now on
3370 * the only valid external interface is through the md
3371 * device.
1da177e4 3372 */
d089c6af 3373 rdev_for_each(rdev, tmp, mddev) {
b2d444d7 3374 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3375 continue;
3376 sync_blockdev(rdev->bdev);
f98393a6 3377 invalidate_bdev(rdev->bdev);
f0d76d70
N		 3378
3379 /* perform some consistency tests on the device.
3380 * We don't want the data to overlap the metadata,
3381 * Internal Bitmap issues has handled elsewhere.
3382 */
3383 if (rdev->data_offset < rdev->sb_offset) {
3384 if (mddev->size &&
3385 rdev->data_offset + mddev->size*2
3386 > rdev->sb_offset*2) {
3387 printk("md: %s: data overlaps metadata\n",
3388 mdname(mddev));
3389 return -EINVAL;
3390 }
3391 } else {
3392 if (rdev->sb_offset*2 + rdev->sb_size/512
3393 > rdev->data_offset) {
3394 printk("md: %s: metadata overlaps data\n",
3395 mdname(mddev));
3396 return -EINVAL;
3397 }
3398 }
1da177e4
LT		 3399 }
3400
3401 md_probe(mddev->unit, NULL, NULL);
3402 disk = mddev->gendisk;
3403 if (!disk)
3404 return -ENOMEM;
3405
3406 spin_lock(&pers_lock);
d9d166c2 3407 pers = find_pers(mddev->level, mddev->clevel);
2604b703 3408 if (!pers || !try_module_get(pers->owner)) {
1da177e4 3409 spin_unlock(&pers_lock);
d9d166c2
N		 3410 if (mddev->level != LEVEL_NONE)
3411 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3412 mddev->level);
3413 else
3414 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3415 mddev->clevel);
1da177e4
LT		 3416 return -EINVAL;
3417 }
2604b703 3418 mddev->pers = pers;
1da177e4 3419 spin_unlock(&pers_lock);
d9d166c2
N		 3420 mddev->level = pers->level;
3421 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
1da177e4 3422
f6705578 3423 if (mddev->reshape_position != MaxSector &&
63c70c4f 3424 pers->start_reshape == NULL) {
f6705578
N		 3425 /* This personality cannot handle reshaping... */
3426 mddev->pers = NULL;
3427 module_put(pers->owner);
3428 return -EINVAL;
3429 }
3430
7dd5e7c3
N		 3431 if (pers->sync_request) {
3432 /* Warn if this is a potentially silly
3433 * configuration.
3434 */
3435 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3436 mdk_rdev_t *rdev2;
3437 struct list_head *tmp2;
3438 int warned = 0;
d089c6af
N		 3439 rdev_for_each(rdev, tmp, mddev) {
3440 rdev_for_each(rdev2, tmp2, mddev) {
7dd5e7c3
N		 3441 if (rdev < rdev2 &&
3442 rdev->bdev->bd_contains ==
3443 rdev2->bdev->bd_contains) {
3444 printk(KERN_WARNING
3445 "%s: WARNING: %s appears to be"
3446 " on the same physical disk as"
3447 " %s.\n",
3448 mdname(mddev),
3449 bdevname(rdev->bdev,b),
3450 bdevname(rdev2->bdev,b2));
3451 warned = 1;
3452 }
3453 }
3454 }
3455 if (warned)
3456 printk(KERN_WARNING
3457 "True protection against single-disk"
3458 " failure might be compromised.\n");
3459 }
3460
657390d2 3461 mddev->recovery = 0;
1da177e4 3462 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 3463 mddev->barriers_work = 1;
6ff8d8ec 3464 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 3465
f91de92e
N		 3466 if (start_readonly)
3467 mddev->ro = 2; /* read-only, but switch on first write */
3468
b15c2e57
N		 3469 err = mddev->pers->run(mddev);
3470 if (!err && mddev->pers->sync_request) {
3471 err = bitmap_create(mddev);
3472 if (err) {
3473 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3474 mdname(mddev), err);
3475 mddev->pers->stop(mddev);
3476 }
3477 }
1da177e4
LT		 3478 if (err) {
3479 printk(KERN_ERR "md: pers->run() failed ...\n");
3480 module_put(mddev->pers->owner);
3481 mddev->pers = NULL;
32a7627c
N		 3482 bitmap_destroy(mddev);
3483 return err;
1da177e4 3484 }
5e55e2f5
N		 3485 if (mddev->pers->sync_request) {
3486 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3487 printk(KERN_WARNING
3488 "md: cannot register extra attributes for %s\n",
3489 mdname(mddev));
3490 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
fd9d49ca
N		 3491 mddev->ro = 0;
3492
1da177e4
LT		 3493 atomic_set(&mddev->writes_pending,0);
3494 mddev->safemode = 0;
3495 mddev->safemode_timer.function = md_safemode_timeout;
3496 mddev->safemode_timer.data = (unsigned long) mddev;
16f17b39 3497 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
1da177e4 3498 mddev->in_sync = 1;
86e6ffdd 3499
d089c6af 3500 rdev_for_each(rdev, tmp, mddev)
86e6ffdd
N		 3501 if (rdev->raid_disk >= 0) {
3502 char nm[20];
3503 sprintf(nm, "rd%d", rdev->raid_disk);
5e55e2f5
N		 3504 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3505 printk("md: cannot register %s for %s\n",
3506 nm, mdname(mddev));
86e6ffdd 3507 }
1da177e4
LT		 3508
3509 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3510
850b2b42
N		 3511 if (mddev->flags)
3512 md_update_sb(mddev, 0);
1da177e4
LT		 3513
3514 set_capacity(disk, mddev->array_size<<1);
3515
3516 /* If we call blk_queue_make_request here, it will
3517 * re-initialise max_sectors etc which may have been
3518 * refined inside -> run. So just set the bits we need to set.
3519 * Most initialisation happended when we called
3520 * blk_queue_make_request(..., md_fail_request)
3521 * earlier.
3522 */
3523 mddev->queue->queuedata = mddev;
3524 mddev->queue->make_request_fn = mddev->pers->make_request;
3525
5fd6c1dc
N		 3526 /* If there is a partially-recovered drive we need to
3527 * start recovery here. If we leave it to md_check_recovery,
3528 * it will remove the drives and not do the right thing
3529 */
0b8c9de0 3530 if (mddev->degraded && !mddev->sync_thread) {
5fd6c1dc
N		 3531 struct list_head *rtmp;
3532 int spares = 0;
d089c6af 3533 rdev_for_each(rdev, rtmp, mddev)
5fd6c1dc
N		 3534 if (rdev->raid_disk >= 0 &&
3535 !test_bit(In_sync, &rdev->flags) &&
3536 !test_bit(Faulty, &rdev->flags))
3537 /* complete an interrupted recovery */
3538 spares++;
3539 if (spares && mddev->pers->sync_request) {
3540 mddev->recovery = 0;
3541 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3542 mddev->sync_thread = md_register_thread(md_do_sync,
3543 mddev,
3544 "%s_resync");
3545 if (!mddev->sync_thread) {
3546 printk(KERN_ERR "%s: could not start resync"
3547 " thread...\n",
3548 mdname(mddev));
3549 /* leave the spares where they are, it shouldn't hurt */
3550 mddev->recovery = 0;
0b8c9de0 3551 }
5fd6c1dc
N		 3552 }
3553 }
0b8c9de0
N		 3554 md_wakeup_thread(mddev->thread);
3555 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5fd6c1dc 3556
44ce6294 3557 mddev->changed = 1;
d7603b7e 3558 md_new_event(mddev);
edfaa7c3 3559 kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE);
1da177e4
LT		 3560 return 0;
3561}
3562
3563static int restart_array(mddev_t *mddev)
3564{
3565 struct gendisk *disk = mddev->gendisk;
3566 int err;
3567
3568 /*
3569 * Complain if it has no devices
3570 */
3571 err = -ENXIO;
3572 if (list_empty(&mddev->disks))
3573 goto out;
3574
3575 if (mddev->pers) {
3576 err = -EBUSY;
3577 if (!mddev->ro)
3578 goto out;
3579
3580 mddev->safemode = 0;
3581 mddev->ro = 0;
3582 set_disk_ro(disk, 0);
3583
3584 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3585 mdname(mddev));
3586 /*
3587 * Kick recovery or resync if necessary
3588 */
3589 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3590 md_wakeup_thread(mddev->thread);
5fd6c1dc 3591 md_wakeup_thread(mddev->sync_thread);
1da177e4 3592 err = 0;
9e653b63 3593 } else
1da177e4 3594 err = -EINVAL;
1da177e4
LT		 3595
3596out:
3597 return err;
3598}
3599
acc55e22
N		 3600/* similar to deny_write_access, but accounts for our holding a reference
3601 * to the file ourselves */
3602static int deny_bitmap_write_access(struct file * file)
3603{
3604 struct inode *inode = file->f_mapping->host;
3605
3606 spin_lock(&inode->i_lock);
3607 if (atomic_read(&inode->i_writecount) > 1) {
3608 spin_unlock(&inode->i_lock);
3609 return -ETXTBSY;
3610 }
3611 atomic_set(&inode->i_writecount, -1);
3612 spin_unlock(&inode->i_lock);
3613
3614 return 0;
3615}
3616
3617static void restore_bitmap_write_access(struct file *file)
3618{
3619 struct inode *inode = file->f_mapping->host;
3620
3621 spin_lock(&inode->i_lock);
3622 atomic_set(&inode->i_writecount, 1);
3623 spin_unlock(&inode->i_lock);
3624}
3625
9e653b63
N		 3626/* mode:
3627 * 0 - completely stop and dis-assemble array
3628 * 1 - switch to readonly
3629 * 2 - stop but do not disassemble array
3630 */
3631static int do_md_stop(mddev_t * mddev, int mode)
1da177e4
LT		 3632{
3633 int err = 0;
3634 struct gendisk *disk = mddev->gendisk;
3635
3636 if (mddev->pers) {
3637 if (atomic_read(&mddev->active)>2) {
3638 printk("md: %s still in use.\n",mdname(mddev));
3639 return -EBUSY;
3640 }
3641
3642 if (mddev->sync_thread) {
5fd6c1dc 3643 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4
LT		 3644 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3645 md_unregister_thread(mddev->sync_thread);
3646 mddev->sync_thread = NULL;
3647 }
3648
3649 del_timer_sync(&mddev->safemode_timer);
3650
3651 invalidate_partition(disk, 0);
3652
9e653b63
N		 3653 switch(mode) {
3654 case 1: /* readonly */
1da177e4 3655 err = -ENXIO;
f91de92e 3656 if (mddev->ro==1)
1da177e4
LT		 3657 goto out;
3658 mddev->ro = 1;
9e653b63
N		 3659 break;
3660 case 0: /* disassemble */
3661 case 2: /* stop */
6b8b3e8a 3662 bitmap_flush(mddev);
a9701a30 3663 md_super_wait(mddev);
1da177e4
LT		 3664 if (mddev->ro)
3665 set_disk_ro(disk, 0);
3666 blk_queue_make_request(mddev->queue, md_fail_request);
3667 mddev->pers->stop(mddev);
d1b5380c
N		 3668 mddev->queue->merge_bvec_fn = NULL;
3669 mddev->queue->unplug_fn = NULL;
041ae52e 3670 mddev->queue->backing_dev_info.congested_fn = NULL;
411036fa
N		 3671 if (mddev->pers->sync_request)
3672 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3673
1da177e4
LT		 3674 module_put(mddev->pers->owner);
3675 mddev->pers = NULL;
0d4ca600
N		 3676
3677 set_capacity(disk, 0);
44ce6294 3678 mddev->changed = 1;
0d4ca600 3679
1da177e4
LT		 3680 if (mddev->ro)
3681 mddev->ro = 0;
3682 }
850b2b42 3683 if (!mddev->in_sync || mddev->flags) {
1da177e4
LT		 3684 /* mark array as shutdown cleanly */
3685 mddev->in_sync = 1;
850b2b42 3686 md_update_sb(mddev, 1);
1da177e4 3687 }
9e653b63 3688 if (mode == 1)
1da177e4 3689 set_disk_ro(disk, 1);
5fd6c1dc 3690 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4 3691 }
32a7627c 3692
1da177e4
LT		 3693 /*
3694 * Free resources if final stop
3695 */
9e653b63 3696 if (mode == 0) {
86e6ffdd
N		 3697 mdk_rdev_t *rdev;
3698 struct list_head *tmp;
0d4ca600 3699
1da177e4
LT		 3700 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3701
978f946b
N		 3702 bitmap_destroy(mddev);
3703 if (mddev->bitmap_file) {
acc55e22 3704 restore_bitmap_write_access(mddev->bitmap_file);
978f946b
N		 3705 fput(mddev->bitmap_file);
3706 mddev->bitmap_file = NULL;
3707 }
3708 mddev->bitmap_offset = 0;
3709
d089c6af 3710 rdev_for_each(rdev, tmp, mddev)
86e6ffdd
N		 3711 if (rdev->raid_disk >= 0) {
3712 char nm[20];
3713 sprintf(nm, "rd%d", rdev->raid_disk);
3714 sysfs_remove_link(&mddev->kobj, nm);
3715 }
3716
177a99b2 3717 /* make sure all md_delayed_delete calls have finished */
5792a285
N		 3718 flush_scheduled_work();
3719
1da177e4
LT		 3720 export_array(mddev);
3721
3722 mddev->array_size = 0;
9e653b63
N		 3723 mddev->size = 0;
3724 mddev->raid_disks = 0;
a94213b1 3725 mddev->recovery_cp = 0;
c6207277 3726 mddev->resync_max = MaxSector;
08a02ecd 3727 mddev->reshape_position = MaxSector;
e691063a 3728 mddev->external = 0;
1ec4a939 3729 mddev->persistent = 0;
d897dbf9
N		 3730 mddev->level = LEVEL_NONE;
3731 mddev->clevel[0] = 0;
3732 mddev->flags = 0;
3733 mddev->ro = 0;
3734 mddev->metadata_type[0] = 0;
3735 mddev->chunk_size = 0;
3736 mddev->ctime = mddev->utime = 0;
3737 mddev->layout = 0;
3738 mddev->max_disks = 0;
3739 mddev->events = 0;
3740 mddev->delta_disks = 0;
3741 mddev->new_level = LEVEL_NONE;
3742 mddev->new_layout = 0;
3743 mddev->new_chunk = 0;
3744 mddev->curr_resync = 0;
3745 mddev->resync_mismatches = 0;
3746 mddev->suspend_lo = mddev->suspend_hi = 0;
3747 mddev->sync_speed_min = mddev->sync_speed_max = 0;
3748 mddev->recovery = 0;
3749 mddev->in_sync = 0;
3750 mddev->changed = 0;
3751 mddev->degraded = 0;
3752 mddev->barriers_work = 0;
3753 mddev->safemode = 0;
9e653b63 3754
a8a55c38 3755 } else if (mddev->pers)
1da177e4
LT		 3756 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3757 mdname(mddev));
3758 err = 0;
d7603b7e 3759 md_new_event(mddev);
1da177e4
LT		 3760out:
3761 return err;
3762}
3763
fdee8ae4 3764#ifndef MODULE
1da177e4
LT		 3765static void autorun_array(mddev_t *mddev)
3766{
3767 mdk_rdev_t *rdev;
3768 struct list_head *tmp;
3769 int err;
3770
a757e64c 3771 if (list_empty(&mddev->disks))
1da177e4 3772 return;
1da177e4
LT		 3773
3774 printk(KERN_INFO "md: running: ");
3775
d089c6af 3776 rdev_for_each(rdev, tmp, mddev) {
1da177e4
LT		 3777 char b[BDEVNAME_SIZE];
3778 printk("<%s>", bdevname(rdev->bdev,b));
3779 }
3780 printk("\n");
3781
3782 err = do_md_run (mddev);
3783 if (err) {
3784 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3785 do_md_stop (mddev, 0);
3786 }
3787}
3788
3789/*
3790 * lets try to run arrays based on all disks that have arrived
3791 * until now. (those are in pending_raid_disks)
3792 *
3793 * the method: pick the first pending disk, collect all disks with
3794 * the same UUID, remove all from the pending list and put them into
3795 * the 'same_array' list. Then order this list based on superblock
3796 * update time (freshest comes first), kick out 'old' disks and
3797 * compare superblocks. If everything's fine then run it.
3798 *
3799 * If "unit" is allocated, then bump its reference count
3800 */
3801static void autorun_devices(int part)
3802{
1da177e4
LT		 3803 struct list_head *tmp;
3804 mdk_rdev_t *rdev0, *rdev;
3805 mddev_t *mddev;
3806 char b[BDEVNAME_SIZE];
3807
3808 printk(KERN_INFO "md: autorun ...\n");
3809 while (!list_empty(&pending_raid_disks)) {
e8703fe1 3810 int unit;
1da177e4 3811 dev_t dev;
ad01c9e3 3812 LIST_HEAD(candidates);
1da177e4
LT		 3813 rdev0 = list_entry(pending_raid_disks.next,
3814 mdk_rdev_t, same_set);
3815
3816 printk(KERN_INFO "md: considering %s ...\n",
3817 bdevname(rdev0->bdev,b));
3818 INIT_LIST_HEAD(&candidates);
73c34431 3819 rdev_for_each_list(rdev, tmp, pending_raid_disks)
1da177e4
LT		 3820 if (super_90_load(rdev, rdev0, 0) >= 0) {
3821 printk(KERN_INFO "md: adding %s ...\n",
3822 bdevname(rdev->bdev,b));
3823 list_move(&rdev->same_set, &candidates);
3824 }
3825 /*
3826 * now we have a set of devices, with all of them having
3827 * mostly sane superblocks. It's time to allocate the
3828 * mddev.
3829 */
e8703fe1
N		 3830 if (part) {
3831 dev = MKDEV(mdp_major,
3832 rdev0->preferred_minor << MdpMinorShift);
3833 unit = MINOR(dev) >> MdpMinorShift;
3834 } else {
3835 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3836 unit = MINOR(dev);
3837 }
3838 if (rdev0->preferred_minor != unit) {
1da177e4
LT		 3839 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3840 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3841 break;
3842 }
1da177e4
LT		 3843
3844 md_probe(dev, NULL, NULL);
3845 mddev = mddev_find(dev);
3846 if (!mddev) {
3847 printk(KERN_ERR
3848 "md: cannot allocate memory for md drive.\n");
3849 break;
3850 }
3851 if (mddev_lock(mddev))
3852 printk(KERN_WARNING "md: %s locked, cannot run\n",
3853 mdname(mddev));
3854 else if (mddev->raid_disks || mddev->major_version
3855 || !list_empty(&mddev->disks)) {
3856 printk(KERN_WARNING
3857 "md: %s already running, cannot run %s\n",
3858 mdname(mddev), bdevname(rdev0->bdev,b));
3859 mddev_unlock(mddev);
3860 } else {
3861 printk(KERN_INFO "md: created %s\n", mdname(mddev));
1ec4a939 3862 mddev->persistent = 1;
73c34431 3863 rdev_for_each_list(rdev, tmp, candidates) {
1da177e4
LT		 3864 list_del_init(&rdev->same_set);
3865 if (bind_rdev_to_array(rdev, mddev))
3866 export_rdev(rdev);
3867 }
3868 autorun_array(mddev);
3869 mddev_unlock(mddev);
3870 }
3871 /* on success, candidates will be empty, on error
3872 * it won't...
3873 */
73c34431 3874 rdev_for_each_list(rdev, tmp, candidates)
1da177e4
LT		 3875 export_rdev(rdev);
3876 mddev_put(mddev);
3877 }
3878 printk(KERN_INFO "md: ... autorun DONE.\n");
3879}
fdee8ae4 3880#endif /* !MODULE */
1da177e4 3881
1da177e4
LT		 3882static int get_version(void __user * arg)
3883{
3884 mdu_version_t ver;
3885
3886 ver.major = MD_MAJOR_VERSION;
3887 ver.minor = MD_MINOR_VERSION;
3888 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3889
3890 if (copy_to_user(arg, &ver, sizeof(ver)))
3891 return -EFAULT;
3892
3893 return 0;
3894}
3895
3896static int get_array_info(mddev_t * mddev, void __user * arg)
3897{
3898 mdu_array_info_t info;
3899 int nr,working,active,failed,spare;
3900 mdk_rdev_t *rdev;
3901 struct list_head *tmp;
3902
3903 nr=working=active=failed=spare=0;
d089c6af 3904 rdev_for_each(rdev, tmp, mddev) {
1da177e4 3905 nr++;
b2d444d7 3906 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3907 failed++;
3908 else {
3909 working++;
b2d444d7 3910 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 3911 active++;
3912 else
3913 spare++;
3914 }
3915 }
3916
3917 info.major_version = mddev->major_version;
3918 info.minor_version = mddev->minor_version;
3919 info.patch_version = MD_PATCHLEVEL_VERSION;
3920 info.ctime = mddev->ctime;
3921 info.level = mddev->level;
3922 info.size = mddev->size;
284ae7ca
N		 3923 if (info.size != mddev->size) /* overflow */
3924 info.size = -1;
1da177e4
LT		 3925 info.nr_disks = nr;
3926 info.raid_disks = mddev->raid_disks;
3927 info.md_minor = mddev->md_minor;
3928 info.not_persistent= !mddev->persistent;
3929
3930 info.utime = mddev->utime;
3931 info.state = 0;
3932 if (mddev->in_sync)
3933 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 3934 if (mddev->bitmap && mddev->bitmap_offset)
3935 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 3936 info.active_disks = active;
3937 info.working_disks = working;
3938 info.failed_disks = failed;
3939 info.spare_disks = spare;
3940
3941 info.layout = mddev->layout;
3942 info.chunk_size = mddev->chunk_size;
3943
3944 if (copy_to_user(arg, &info, sizeof(info)))
3945 return -EFAULT;
3946
3947 return 0;
3948}
3949
87162a28 3950static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 3951{
3952 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3953 char *ptr, *buf = NULL;
3954 int err = -ENOMEM;
3955
2a2275d6
N		 3956 md_allow_write(mddev);
3957
32a7627c
N		 3958 file = kmalloc(sizeof(*file), GFP_KERNEL);
3959 if (!file)
3960 goto out;
3961
3962 /* bitmap disabled, zero the first byte and copy out */
3963 if (!mddev->bitmap || !mddev->bitmap->file) {
3964 file->pathname[0] = '\0';
3965 goto copy_out;
3966 }
3967
3968 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3969 if (!buf)
3970 goto out;
3971
3972 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3973 if (!ptr)
3974 goto out;
3975
3976 strcpy(file->pathname, ptr);
3977
3978copy_out:
3979 err = 0;
3980 if (copy_to_user(arg, file, sizeof(*file)))
3981 err = -EFAULT;
3982out:
3983 kfree(buf);
3984 kfree(file);
3985 return err;
3986}
3987
1da177e4
LT		 3988static int get_disk_info(mddev_t * mddev, void __user * arg)
3989{
3990 mdu_disk_info_t info;
3991 unsigned int nr;
3992 mdk_rdev_t *rdev;
3993
3994 if (copy_from_user(&info, arg, sizeof(info)))
3995 return -EFAULT;
3996
3997 nr = info.number;
3998
3999 rdev = find_rdev_nr(mddev, nr);
4000 if (rdev) {
4001 info.major = MAJOR(rdev->bdev->bd_dev);
4002 info.minor = MINOR(rdev->bdev->bd_dev);
4003 info.raid_disk = rdev->raid_disk;
4004 info.state = 0;
b2d444d7 4005 if (test_bit(Faulty, &rdev->flags))
1da177e4 4006 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 4007 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 4008 info.state |= (1<<MD_DISK_ACTIVE);
4009 info.state |= (1<<MD_DISK_SYNC);
4010 }
8ddf9efe
N		 4011 if (test_bit(WriteMostly, &rdev->flags))
4012 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 4013 } else {
4014 info.major = info.minor = 0;
4015 info.raid_disk = -1;
4016 info.state = (1<<MD_DISK_REMOVED);
4017 }
4018
4019 if (copy_to_user(arg, &info, sizeof(info)))
4020 return -EFAULT;
4021
4022 return 0;
4023}
4024
4025static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4026{
4027 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4028 mdk_rdev_t *rdev;
4029 dev_t dev = MKDEV(info->major,info->minor);
4030
4031 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4032 return -EOVERFLOW;
4033
4034 if (!mddev->raid_disks) {
4035 int err;
4036 /* expecting a device which has a superblock */
4037 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4038 if (IS_ERR(rdev)) {
4039 printk(KERN_WARNING
4040 "md: md_import_device returned %ld\n",
4041 PTR_ERR(rdev));
4042 return PTR_ERR(rdev);
4043 }
4044 if (!list_empty(&mddev->disks)) {
4045 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4046 mdk_rdev_t, same_set);
4047 int err = super_types[mddev->major_version]
4048 .load_super(rdev, rdev0, mddev->minor_version);
4049 if (err < 0) {
4050 printk(KERN_WARNING
4051 "md: %s has different UUID to %s\n",
4052 bdevname(rdev->bdev,b),
4053 bdevname(rdev0->bdev,b2));
4054 export_rdev(rdev);
4055 return -EINVAL;
4056 }
4057 }
4058 err = bind_rdev_to_array(rdev, mddev);
4059 if (err)
4060 export_rdev(rdev);
4061 return err;
4062 }
4063
4064 /*
4065 * add_new_disk can be used once the array is assembled
4066 * to add "hot spares". They must already have a superblock
4067 * written
4068 */
4069 if (mddev->pers) {
4070 int err;
4071 if (!mddev->pers->hot_add_disk) {
4072 printk(KERN_WARNING
4073 "%s: personality does not support diskops!\n",
4074 mdname(mddev));
4075 return -EINVAL;
4076 }
7b1e35f6
N		 4077 if (mddev->persistent)
4078 rdev = md_import_device(dev, mddev->major_version,
4079 mddev->minor_version);
4080 else
4081 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 4082 if (IS_ERR(rdev)) {
4083 printk(KERN_WARNING
4084 "md: md_import_device returned %ld\n",
4085 PTR_ERR(rdev));
4086 return PTR_ERR(rdev);
4087 }
41158c7e
N		 4088 /* set save_raid_disk if appropriate */
4089 if (!mddev->persistent) {
4090 if (info->state & (1<<MD_DISK_SYNC) &&
4091 info->raid_disk < mddev->raid_disks)
4092 rdev->raid_disk = info->raid_disk;
4093 else
4094 rdev->raid_disk = -1;
4095 } else
4096 super_types[mddev->major_version].
4097 validate_super(mddev, rdev);
4098 rdev->saved_raid_disk = rdev->raid_disk;
4099
b2d444d7 4100 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 4101 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4102 set_bit(WriteMostly, &rdev->flags);
4103
1da177e4
LT		 4104 rdev->raid_disk = -1;
4105 err = bind_rdev_to_array(rdev, mddev);
7c7546cc
N		 4106 if (!err && !mddev->pers->hot_remove_disk) {
4107 /* If there is hot_add_disk but no hot_remove_disk
4108 * then added disks for geometry changes,
4109 * and should be added immediately.
4110 */
4111 super_types[mddev->major_version].
4112 validate_super(mddev, rdev);
4113 err = mddev->pers->hot_add_disk(mddev, rdev);
4114 if (err)
4115 unbind_rdev_from_array(rdev);
4116 }
1da177e4
LT		 4117 if (err)
4118 export_rdev(rdev);
c361777f 4119
17571284 4120 md_update_sb(mddev, 1);
c361777f 4121 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 4122 md_wakeup_thread(mddev->thread);
1da177e4
LT		 4123 return err;
4124 }
4125
4126 /* otherwise, add_new_disk is only allowed
4127 * for major_version==0 superblocks
4128 */
4129 if (mddev->major_version != 0) {
4130 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4131 mdname(mddev));
4132 return -EINVAL;
4133 }
4134
4135 if (!(info->state & (1<<MD_DISK_FAULTY))) {
4136 int err;
4137 rdev = md_import_device (dev, -1, 0);
4138 if (IS_ERR(rdev)) {
4139 printk(KERN_WARNING
4140 "md: error, md_import_device() returned %ld\n",
4141 PTR_ERR(rdev));
4142 return PTR_ERR(rdev);
4143 }
4144 rdev->desc_nr = info->number;
4145 if (info->raid_disk < mddev->raid_disks)
4146 rdev->raid_disk = info->raid_disk;
4147 else
4148 rdev->raid_disk = -1;
4149
1da177e4 4150 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 4151 if (info->state & (1<<MD_DISK_SYNC))
4152 set_bit(In_sync, &rdev->flags);
1da177e4 4153
8ddf9efe
N		 4154 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4155 set_bit(WriteMostly, &rdev->flags);
4156
1da177e4
LT		 4157 if (!mddev->persistent) {
4158 printk(KERN_INFO "md: nonpersistent superblock ...\n");
4159 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4160 } else
4161 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
4162 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
4163
2bf071bf
N		 4164 err = bind_rdev_to_array(rdev, mddev);
4165 if (err) {
4166 export_rdev(rdev);
4167 return err;
4168 }
1da177e4
LT		 4169 }
4170
4171 return 0;
4172}
4173
4174static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4175{
4176 char b[BDEVNAME_SIZE];
4177 mdk_rdev_t *rdev;
4178
4179 if (!mddev->pers)
4180 return -ENODEV;
4181
4182 rdev = find_rdev(mddev, dev);
4183 if (!rdev)
4184 return -ENXIO;
4185
4186 if (rdev->raid_disk >= 0)
4187 goto busy;
4188
4189 kick_rdev_from_array(rdev);
850b2b42 4190 md_update_sb(mddev, 1);
d7603b7e 4191 md_new_event(mddev);
1da177e4
LT		 4192
4193 return 0;
4194busy:
fdefa4d8 4195 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
1da177e4
LT		 4196 bdevname(rdev->bdev,b), mdname(mddev));
4197 return -EBUSY;
4198}
4199
4200static int hot_add_disk(mddev_t * mddev, dev_t dev)
4201{
4202 char b[BDEVNAME_SIZE];
4203 int err;
4204 unsigned int size;
4205 mdk_rdev_t *rdev;
4206
4207 if (!mddev->pers)
4208 return -ENODEV;
4209
4210 if (mddev->major_version != 0) {
4211 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4212 " version-0 superblocks.\n",
4213 mdname(mddev));
4214 return -EINVAL;
4215 }
4216 if (!mddev->pers->hot_add_disk) {
4217 printk(KERN_WARNING
4218 "%s: personality does not support diskops!\n",
4219 mdname(mddev));
4220 return -EINVAL;
4221 }
4222
4223 rdev = md_import_device (dev, -1, 0);
4224 if (IS_ERR(rdev)) {
4225 printk(KERN_WARNING
4226 "md: error, md_import_device() returned %ld\n",
4227 PTR_ERR(rdev));
4228 return -EINVAL;
4229 }
4230
4231 if (mddev->persistent)
4232 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
4233 else
4234 rdev->sb_offset =
4235 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4236
4237 size = calc_dev_size(rdev, mddev->chunk_size);
4238 rdev->size = size;
4239
b2d444d7 4240 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4241 printk(KERN_WARNING
4242 "md: can not hot-add faulty %s disk to %s!\n",
4243 bdevname(rdev->bdev,b), mdname(mddev));
4244 err = -EINVAL;
4245 goto abort_export;
4246 }
b2d444d7 4247 clear_bit(In_sync, &rdev->flags);
1da177e4 4248 rdev->desc_nr = -1;
5842730d 4249 rdev->saved_raid_disk = -1;
2bf071bf
N		 4250 err = bind_rdev_to_array(rdev, mddev);
4251 if (err)
4252 goto abort_export;
1da177e4
LT		 4253
4254 /*
4255 * The rest should better be atomic, we can have disk failures
4256 * noticed in interrupt contexts ...
4257 */
4258
4259 if (rdev->desc_nr == mddev->max_disks) {
4260 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
4261 mdname(mddev));
4262 err = -EBUSY;
4263 goto abort_unbind_export;
4264 }
4265
4266 rdev->raid_disk = -1;
4267
850b2b42 4268 md_update_sb(mddev, 1);
1da177e4
LT		 4269
4270 /*
4271 * Kick recovery, maybe this spare has to be added to the
4272 * array immediately.
4273 */
4274 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4275 md_wakeup_thread(mddev->thread);
d7603b7e 4276 md_new_event(mddev);
1da177e4
LT		 4277 return 0;
4278
4279abort_unbind_export:
4280 unbind_rdev_from_array(rdev);
4281
4282abort_export:
4283 export_rdev(rdev);
4284 return err;
4285}
4286
32a7627c
N		 4287static int set_bitmap_file(mddev_t *mddev, int fd)
4288{
4289 int err;
4290
36fa3063
N		 4291 if (mddev->pers) {
4292 if (!mddev->pers->quiesce)
4293 return -EBUSY;
4294 if (mddev->recovery || mddev->sync_thread)
4295 return -EBUSY;
4296 /* we should be able to change the bitmap.. */
4297 }
32a7627c 4298
32a7627c 4299
36fa3063
N		 4300 if (fd >= 0) {
4301 if (mddev->bitmap)
4302 return -EEXIST; /* cannot add when bitmap is present */
4303 mddev->bitmap_file = fget(fd);
32a7627c 4304
36fa3063
N		 4305 if (mddev->bitmap_file == NULL) {
4306 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4307 mdname(mddev));
4308 return -EBADF;
4309 }
4310
4311 err = deny_bitmap_write_access(mddev->bitmap_file);
4312 if (err) {
4313 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4314 mdname(mddev));
4315 fput(mddev->bitmap_file);
4316 mddev->bitmap_file = NULL;
4317 return err;
4318 }
a654b9d8 4319 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 4320 } else if (mddev->bitmap == NULL)
4321 return -ENOENT; /* cannot remove what isn't there */
4322 err = 0;
4323 if (mddev->pers) {
4324 mddev->pers->quiesce(mddev, 1);
4325 if (fd >= 0)
4326 err = bitmap_create(mddev);
d7375ab3 4327 if (fd < 0 || err) {
36fa3063 4328 bitmap_destroy(mddev);
d7375ab3
N		 4329 fd = -1; /* make sure to put the file */
4330 }
36fa3063 4331 mddev->pers->quiesce(mddev, 0);
d7375ab3
N		 4332 }
4333 if (fd < 0) {
acc55e22
N		 4334 if (mddev->bitmap_file) {
4335 restore_bitmap_write_access(mddev->bitmap_file);
36fa3063 4336 fput(mddev->bitmap_file);
acc55e22 4337 }
36fa3063
N		 4338 mddev->bitmap_file = NULL;
4339 }
4340
32a7627c
N		 4341 return err;
4342}
4343
1da177e4
LT		 4344/*
4345 * set_array_info is used two different ways
4346 * The original usage is when creating a new array.
4347 * In this usage, raid_disks is > 0 and it together with
4348 * level, size, not_persistent,layout,chunksize determine the
4349 * shape of the array.
4350 * This will always create an array with a type-0.90.0 superblock.
4351 * The newer usage is when assembling an array.
4352 * In this case raid_disks will be 0, and the major_version field is
4353 * use to determine which style super-blocks are to be found on the devices.
4354 * The minor and patch _version numbers are also kept incase the
4355 * super_block handler wishes to interpret them.
4356 */
4357static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4358{
4359
4360 if (info->raid_disks == 0) {
4361 /* just setting version number for superblock loading */
4362 if (info->major_version < 0 ||
50511da3 4363 info->major_version >= ARRAY_SIZE(super_types) ||
1da177e4
LT		 4364 super_types[info->major_version].name == NULL) {
4365 /* maybe try to auto-load a module? */
4366 printk(KERN_INFO
4367 "md: superblock version %d not known\n",
4368 info->major_version);
4369 return -EINVAL;
4370 }
4371 mddev->major_version = info->major_version;
4372 mddev->minor_version = info->minor_version;
4373 mddev->patch_version = info->patch_version;
3f9d7b0d 4374 mddev->persistent = !info->not_persistent;
1da177e4
LT		 4375 return 0;
4376 }
4377 mddev->major_version = MD_MAJOR_VERSION;
4378 mddev->minor_version = MD_MINOR_VERSION;
4379 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4380 mddev->ctime = get_seconds();
4381
4382 mddev->level = info->level;
17115e03 4383 mddev->clevel[0] = 0;
1da177e4
LT		 4384 mddev->size = info->size;
4385 mddev->raid_disks = info->raid_disks;
4386 /* don't set md_minor, it is determined by which /dev/md* was
4387 * openned
4388 */
4389 if (info->state & (1<<MD_SB_CLEAN))
4390 mddev->recovery_cp = MaxSector;
4391 else
4392 mddev->recovery_cp = 0;
4393 mddev->persistent = ! info->not_persistent;
e691063a 4394 mddev->external = 0;
1da177e4
LT		 4395
4396 mddev->layout = info->layout;
4397 mddev->chunk_size = info->chunk_size;
4398
4399 mddev->max_disks = MD_SB_DISKS;
4400
e691063a
N		 4401 if (mddev->persistent)
4402 mddev->flags = 0;
850b2b42 4403 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 4404
b2a2703c
N		 4405 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4406 mddev->bitmap_offset = 0;
4407
f6705578
N		 4408 mddev->reshape_position = MaxSector;
4409
1da177e4
LT		 4410 /*
4411 * Generate a 128 bit UUID
4412 */
4413 get_random_bytes(mddev->uuid, 16);
4414
f6705578
N		 4415 mddev->new_level = mddev->level;
4416 mddev->new_chunk = mddev->chunk_size;
4417 mddev->new_layout = mddev->layout;
4418 mddev->delta_disks = 0;
4419
1da177e4
LT		 4420 return 0;
4421}
4422
a35b0d69
N		 4423static int update_size(mddev_t *mddev, unsigned long size)
4424{
4425 mdk_rdev_t * rdev;
4426 int rv;
4427 struct list_head *tmp;
8ddeeae5 4428 int fit = (size == 0);
a35b0d69
N		 4429
4430 if (mddev->pers->resize == NULL)
4431 return -EINVAL;
4432 /* The "size" is the amount of each device that is used.
4433 * This can only make sense for arrays with redundancy.
4434 * linear and raid0 always use whatever space is available
4435 * We can only consider changing the size if no resync
4436 * or reconstruction is happening, and if the new size
4437 * is acceptable. It must fit before the sb_offset or,
4438 * if that is <data_offset, it must fit before the
4439 * size of each device.
4440 * If size is zero, we find the largest size that fits.
4441 */
4442 if (mddev->sync_thread)
4443 return -EBUSY;
d089c6af 4444 rdev_for_each(rdev, tmp, mddev) {
a35b0d69 4445 sector_t avail;
01ab5662
N		 4446 avail = rdev->size * 2;
4447
a35b0d69
N		 4448 if (fit && (size == 0 || size > avail/2))
4449 size = avail/2;
4450 if (avail < ((sector_t)size << 1))
4451 return -ENOSPC;
4452 }
4453 rv = mddev->pers->resize(mddev, (sector_t)size *2);
4454 if (!rv) {
4455 struct block_device *bdev;
4456
4457 bdev = bdget_disk(mddev->gendisk, 0);
4458 if (bdev) {
1b1dcc1b 4459 mutex_lock(&bdev->bd_inode->i_mutex);
6d89332b 4460 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
1b1dcc1b 4461 mutex_unlock(&bdev->bd_inode->i_mutex);
a35b0d69
N		 4462 bdput(bdev);
4463 }
4464 }
4465 return rv;
4466}
4467
da943b99
N		 4468static int update_raid_disks(mddev_t *mddev, int raid_disks)
4469{
4470 int rv;
4471 /* change the number of raid disks */
63c70c4f 4472 if (mddev->pers->check_reshape == NULL)
da943b99
N		 4473 return -EINVAL;
4474 if (raid_disks <= 0 ||
4475 raid_disks >= mddev->max_disks)
4476 return -EINVAL;
63c70c4f 4477 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
da943b99 4478 return -EBUSY;
63c70c4f
N		 4479 mddev->delta_disks = raid_disks - mddev->raid_disks;
4480
4481 rv = mddev->pers->check_reshape(mddev);
da943b99
N		 4482 return rv;
4483}
4484
4485
1da177e4
LT		 4486/*
4487 * update_array_info is used to change the configuration of an
4488 * on-line array.
4489 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4490 * fields in the info are checked against the array.
4491 * Any differences that cannot be handled will cause an error.
4492 * Normally, only one change can be managed at a time.
4493 */
4494static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4495{
4496 int rv = 0;
4497 int cnt = 0;
36fa3063
N		 4498 int state = 0;
4499
4500 /* calculate expected state,ignoring low bits */
4501 if (mddev->bitmap && mddev->bitmap_offset)
4502 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 4503
4504 if (mddev->major_version != info->major_version ||
4505 mddev->minor_version != info->minor_version ||
4506/* mddev->patch_version != info->patch_version || */
4507 mddev->ctime != info->ctime ||
4508 mddev->level != info->level ||
4509/* mddev->layout != info->layout || */
4510 !mddev->persistent != info->not_persistent||
36fa3063
N		 4511 mddev->chunk_size != info->chunk_size ||
4512 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4513 ((state^info->state) & 0xfffffe00)
4514 )
1da177e4
LT		 4515 return -EINVAL;
4516 /* Check there is only one change */
284ae7ca 4517 if (info->size >= 0 && mddev->size != info->size) cnt++;
1da177e4
LT		 4518 if (mddev->raid_disks != info->raid_disks) cnt++;
4519 if (mddev->layout != info->layout) cnt++;
36fa3063 4520 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 4521 if (cnt == 0) return 0;
4522 if (cnt > 1) return -EINVAL;
4523
4524 if (mddev->layout != info->layout) {
4525 /* Change layout
4526 * we don't need to do anything at the md level, the
4527 * personality will take care of it all.
4528 */
4529 if (mddev->pers->reconfig == NULL)
4530 return -EINVAL;
4531 else
4532 return mddev->pers->reconfig(mddev, info->layout, -1);
4533 }
284ae7ca 4534 if (info->size >= 0 && mddev->size != info->size)
a35b0d69
N		 4535 rv = update_size(mddev, info->size);
4536
da943b99
N		 4537 if (mddev->raid_disks != info->raid_disks)
4538 rv = update_raid_disks(mddev, info->raid_disks);
4539
36fa3063
N		 4540 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4541 if (mddev->pers->quiesce == NULL)
4542 return -EINVAL;
4543 if (mddev->recovery || mddev->sync_thread)
4544 return -EBUSY;
4545 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4546 /* add the bitmap */
4547 if (mddev->bitmap)
4548 return -EEXIST;
4549 if (mddev->default_bitmap_offset == 0)
4550 return -EINVAL;
4551 mddev->bitmap_offset = mddev->default_bitmap_offset;
4552 mddev->pers->quiesce(mddev, 1);
4553 rv = bitmap_create(mddev);
4554 if (rv)
4555 bitmap_destroy(mddev);
4556 mddev->pers->quiesce(mddev, 0);
4557 } else {
4558 /* remove the bitmap */
4559 if (!mddev->bitmap)
4560 return -ENOENT;
4561 if (mddev->bitmap->file)
4562 return -EINVAL;
4563 mddev->pers->quiesce(mddev, 1);
4564 bitmap_destroy(mddev);
4565 mddev->pers->quiesce(mddev, 0);
4566 mddev->bitmap_offset = 0;
4567 }
4568 }
850b2b42 4569 md_update_sb(mddev, 1);
1da177e4
LT		 4570 return rv;
4571}
4572
4573static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4574{
4575 mdk_rdev_t *rdev;
4576
4577 if (mddev->pers == NULL)
4578 return -ENODEV;
4579
4580 rdev = find_rdev(mddev, dev);
4581 if (!rdev)
4582 return -ENODEV;
4583
4584 md_error(mddev, rdev);
4585 return 0;
4586}
4587
a885c8c4
CH		 4588static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4589{
4590 mddev_t *mddev = bdev->bd_disk->private_data;
4591
4592 geo->heads = 2;
4593 geo->sectors = 4;
4594 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4595 return 0;
4596}
4597
1da177e4
LT		 4598static int md_ioctl(struct inode *inode, struct file *file,
4599 unsigned int cmd, unsigned long arg)
4600{
4601 int err = 0;
4602 void __user *argp = (void __user *)arg;
1da177e4
LT		 4603 mddev_t *mddev = NULL;
4604
4605 if (!capable(CAP_SYS_ADMIN))
4606 return -EACCES;
4607
4608 /*
4609 * Commands dealing with the RAID driver but not any
4610 * particular array:
4611 */
4612 switch (cmd)
4613 {
4614 case RAID_VERSION:
4615 err = get_version(argp);
4616 goto done;
4617
4618 case PRINT_RAID_DEBUG:
4619 err = 0;
4620 md_print_devices();
4621 goto done;
4622
4623#ifndef MODULE
4624 case RAID_AUTORUN:
4625 err = 0;
4626 autostart_arrays(arg);
4627 goto done;
4628#endif
4629 default:;
4630 }
4631
4632 /*
4633 * Commands creating/starting a new array:
4634 */
4635
4636 mddev = inode->i_bdev->bd_disk->private_data;
4637
4638 if (!mddev) {
4639 BUG();
4640 goto abort;
4641 }
4642
1da177e4
LT		 4643 err = mddev_lock(mddev);
4644 if (err) {
4645 printk(KERN_INFO
4646 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4647 err, cmd);
4648 goto abort;
4649 }
4650
4651 switch (cmd)
4652 {
4653 case SET_ARRAY_INFO:
4654 {
4655 mdu_array_info_t info;
4656 if (!arg)
4657 memset(&info, 0, sizeof(info));
4658 else if (copy_from_user(&info, argp, sizeof(info))) {
4659 err = -EFAULT;
4660 goto abort_unlock;
4661 }
4662 if (mddev->pers) {
4663 err = update_array_info(mddev, &info);
4664 if (err) {
4665 printk(KERN_WARNING "md: couldn't update"
4666 " array info. %d\n", err);
4667 goto abort_unlock;
4668 }
4669 goto done_unlock;
4670 }
4671 if (!list_empty(&mddev->disks)) {
4672 printk(KERN_WARNING
4673 "md: array %s already has disks!\n",
4674 mdname(mddev));
4675 err = -EBUSY;
4676 goto abort_unlock;
4677 }
4678 if (mddev->raid_disks) {
4679 printk(KERN_WARNING
4680 "md: array %s already initialised!\n",
4681 mdname(mddev));
4682 err = -EBUSY;
4683 goto abort_unlock;
4684 }
4685 err = set_array_info(mddev, &info);
4686 if (err) {
4687 printk(KERN_WARNING "md: couldn't set"
4688 " array info. %d\n", err);
4689 goto abort_unlock;
4690 }
4691 }
4692 goto done_unlock;
4693
4694 default:;
4695 }
4696
4697 /*
4698 * Commands querying/configuring an existing array:
4699 */
32a7627c 4700 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3f9d7b0d 4701 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
a17184a9
N		 4702 if ((!mddev->raid_disks && !mddev->external)
4703 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4704 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4705 && cmd != GET_BITMAP_FILE) {
1da177e4
LT		 4706 err = -ENODEV;
4707 goto abort_unlock;
4708 }
4709
4710 /*
4711 * Commands even a read-only array can execute:
4712 */
4713 switch (cmd)
4714 {
4715 case GET_ARRAY_INFO:
4716 err = get_array_info(mddev, argp);
4717 goto done_unlock;
4718
32a7627c 4719 case GET_BITMAP_FILE:
87162a28 4720 err = get_bitmap_file(mddev, argp);
32a7627c
N		 4721 goto done_unlock;
4722
1da177e4
LT		 4723 case GET_DISK_INFO:
4724 err = get_disk_info(mddev, argp);
4725 goto done_unlock;
4726
4727 case RESTART_ARRAY_RW:
4728 err = restart_array(mddev);
4729 goto done_unlock;
4730
4731 case STOP_ARRAY:
4732 err = do_md_stop (mddev, 0);
4733 goto done_unlock;
4734
4735 case STOP_ARRAY_RO:
4736 err = do_md_stop (mddev, 1);
4737 goto done_unlock;
4738
4739 /*
4740 * We have a problem here : there is no easy way to give a CHS
4741 * virtual geometry. We currently pretend that we have a 2 heads
4742 * 4 sectors (with a BIG number of cylinders...). This drives
4743 * dosfs just mad... ;-)
4744 */
1da177e4
LT		 4745 }
4746
4747 /*
4748 * The remaining ioctls are changing the state of the
f91de92e
N		 4749 * superblock, so we do not allow them on read-only arrays.
4750 * However non-MD ioctls (e.g. get-size) will still come through
4751 * here and hit the 'default' below, so only disallow
4752 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 4753 */
f91de92e
N		 4754 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4755 mddev->ro && mddev->pers) {
4756 if (mddev->ro == 2) {
4757 mddev->ro = 0;
4758 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4759 md_wakeup_thread(mddev->thread);
4760
4761 } else {
4762 err = -EROFS;
4763 goto abort_unlock;
4764 }
1da177e4
LT		 4765 }
4766
4767 switch (cmd)
4768 {
4769 case ADD_NEW_DISK:
4770 {
4771 mdu_disk_info_t info;
4772 if (copy_from_user(&info, argp, sizeof(info)))
4773 err = -EFAULT;
4774 else
4775 err = add_new_disk(mddev, &info);
4776 goto done_unlock;
4777 }
4778
4779 case HOT_REMOVE_DISK:
4780 err = hot_remove_disk(mddev, new_decode_dev(arg));
4781 goto done_unlock;
4782
4783 case HOT_ADD_DISK:
4784 err = hot_add_disk(mddev, new_decode_dev(arg));
4785 goto done_unlock;
4786
4787 case SET_DISK_FAULTY:
4788 err = set_disk_faulty(mddev, new_decode_dev(arg));
4789 goto done_unlock;
4790
4791 case RUN_ARRAY:
4792 err = do_md_run (mddev);
4793 goto done_unlock;
4794
32a7627c
N		 4795 case SET_BITMAP_FILE:
4796 err = set_bitmap_file(mddev, (int)arg);
4797 goto done_unlock;
4798
1da177e4 4799 default:
1da177e4
LT		 4800 err = -EINVAL;
4801 goto abort_unlock;
4802 }
4803
4804done_unlock:
4805abort_unlock:
4806 mddev_unlock(mddev);
4807
4808 return err;
4809done:
4810 if (err)
4811 MD_BUG();
4812abort:
4813 return err;
4814}
4815
4816static int md_open(struct inode *inode, struct file *file)
4817{
4818 /*
4819 * Succeed if we can lock the mddev, which confirms that
4820 * it isn't being stopped right now.
4821 */
4822 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4823 int err;
4824
d63a5a74 4825 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
1da177e4
LT		 4826 goto out;
4827
4828 err = 0;
4829 mddev_get(mddev);
4830 mddev_unlock(mddev);
4831
4832 check_disk_change(inode->i_bdev);
4833 out:
4834 return err;
4835}
4836
4837static int md_release(struct inode *inode, struct file * file)
4838{
4839 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4840
52e5f9d1 4841 BUG_ON(!mddev);
1da177e4
LT		 4842 mddev_put(mddev);
4843
4844 return 0;
4845}
4846
44ce6294
LT		 4847static int md_media_changed(struct gendisk *disk)
4848{
4849 mddev_t *mddev = disk->private_data;
4850
4851 return mddev->changed;
4852}
4853
4854static int md_revalidate(struct gendisk *disk)
4855{
4856 mddev_t *mddev = disk->private_data;
4857
4858 mddev->changed = 0;
4859 return 0;
4860}
1da177e4
LT		 4861static struct block_device_operations md_fops =
4862{
4863 .owner = THIS_MODULE,
4864 .open = md_open,
4865 .release = md_release,
4866 .ioctl = md_ioctl,
a885c8c4 4867 .getgeo = md_getgeo,
44ce6294
LT		 4868 .media_changed = md_media_changed,
4869 .revalidate_disk= md_revalidate,
1da177e4
LT		 4870};
4871
75c96f85 4872static int md_thread(void * arg)
1da177e4
LT		 4873{
4874 mdk_thread_t *thread = arg;
4875
1da177e4
LT		 4876 /*
4877 * md_thread is a 'system-thread', it's priority should be very
4878 * high. We avoid resource deadlocks individually in each
4879 * raid personality. (RAID5 does preallocation) We also use RR and
4880 * the very same RT priority as kswapd, thus we will never get
4881 * into a priority inversion deadlock.
4882 *
4883 * we definitely have to have equal or higher priority than
4884 * bdflush, otherwise bdflush will deadlock if there are too
4885 * many dirty RAID5 blocks.
4886 */
1da177e4 4887
6985c43f 4888 allow_signal(SIGKILL);
a6fb0934 4889 while (!kthread_should_stop()) {
1da177e4 4890
93588e22
N		 4891 /* We need to wait INTERRUPTIBLE so that
4892 * we don't add to the load-average.
4893 * That means we need to be sure no signals are
4894 * pending
4895 */
4896 if (signal_pending(current))
4897 flush_signals(current);
4898
4899 wait_event_interruptible_timeout
4900 (thread->wqueue,
4901 test_bit(THREAD_WAKEUP, &thread->flags)
4902 || kthread_should_stop(),
4903 thread->timeout);
1da177e4
LT		 4904
4905 clear_bit(THREAD_WAKEUP, &thread->flags);
4906
787453c2 4907 thread->run(thread->mddev);
1da177e4 4908 }
a6fb0934 4909
1da177e4
LT		 4910 return 0;
4911}
4912
4913void md_wakeup_thread(mdk_thread_t *thread)
4914{
4915 if (thread) {
4916 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4917 set_bit(THREAD_WAKEUP, &thread->flags);
4918 wake_up(&thread->wqueue);
4919 }
4920}
4921
4922mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4923 const char *name)
4924{
4925 mdk_thread_t *thread;
1da177e4 4926
9ffae0cf 4927 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 4928 if (!thread)
4929 return NULL;
4930
1da177e4
LT		 4931 init_waitqueue_head(&thread->wqueue);
4932
1da177e4
LT		 4933 thread->run = run;
4934 thread->mddev = mddev;
32a7627c 4935 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 4936 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 4937 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 4938 kfree(thread);
4939 return NULL;
4940 }
1da177e4
LT		 4941 return thread;
4942}
4943
1da177e4
LT		 4944void md_unregister_thread(mdk_thread_t *thread)
4945{
ba25f9dc 4946 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
a6fb0934
N		 4947
4948 kthread_stop(thread->tsk);
1da177e4
LT		 4949 kfree(thread);
4950}
4951
4952void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4953{
4954 if (!mddev) {
4955 MD_BUG();
4956 return;
4957 }
4958
b2d444d7 4959 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 4960 return;
32a7627c 4961/*
1da177e4
LT		 4962 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4963 mdname(mddev),
4964 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4965 __builtin_return_address(0),__builtin_return_address(1),
4966 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 4967*/
d0a0a5ee
AM		 4968 if (!mddev->pers)
4969 return;
1da177e4
LT		 4970 if (!mddev->pers->error_handler)
4971 return;
4972 mddev->pers->error_handler(mddev,rdev);
4973 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4974 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4975 md_wakeup_thread(mddev->thread);
c331eb04 4976 md_new_event_inintr(mddev);
1da177e4
LT		 4977}
4978
4979/* seq_file implementation /proc/mdstat */
4980
4981static void status_unused(struct seq_file *seq)
4982{
4983 int i = 0;
4984 mdk_rdev_t *rdev;
4985 struct list_head *tmp;
4986
4987 seq_printf(seq, "unused devices: ");
4988
73c34431 4989 rdev_for_each_list(rdev, tmp, pending_raid_disks) {
1da177e4
LT		 4990 char b[BDEVNAME_SIZE];
4991 i++;
4992 seq_printf(seq, "%s ",
4993 bdevname(rdev->bdev,b));
4994 }
4995 if (!i)
4996 seq_printf(seq, "<none>");
4997
4998 seq_printf(seq, "\n");
4999}
5000
5001
5002static void status_resync(struct seq_file *seq, mddev_t * mddev)
5003{
4588b42e
N		 5004 sector_t max_blocks, resync, res;
5005 unsigned long dt, db, rt;
5006 int scale;
5007 unsigned int per_milli;
1da177e4
LT		 5008
5009 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
5010
5011 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5012 max_blocks = mddev->resync_max_sectors >> 1;
5013 else
5014 max_blocks = mddev->size;
5015
5016 /*
5017 * Should not happen.
5018 */
5019 if (!max_blocks) {
5020 MD_BUG();
5021 return;
5022 }
4588b42e
N		 5023 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5024 * in a sector_t, and (max_blocks>>scale) will fit in a
5025 * u32, as those are the requirements for sector_div.
5026 * Thus 'scale' must be at least 10
5027 */
5028 scale = 10;
5029 if (sizeof(sector_t) > sizeof(unsigned long)) {
5030 while ( max_blocks/2 > (1ULL<<(scale+32)))
5031 scale++;
5032 }
5033 res = (resync>>scale)*1000;
5034 sector_div(res, (u32)((max_blocks>>scale)+1));
5035
5036 per_milli = res;
1da177e4 5037 {
4588b42e 5038 int i, x = per_milli/50, y = 20-x;
1da177e4
LT		 5039 seq_printf(seq, "[");
5040 for (i = 0; i < x; i++)
5041 seq_printf(seq, "=");
5042 seq_printf(seq, ">");
5043 for (i = 0; i < y; i++)
5044 seq_printf(seq, ".");
5045 seq_printf(seq, "] ");
5046 }
4588b42e 5047 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
ccfcc3c1
N		 5048 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5049 "reshape" :
61df9d91
N		 5050 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5051 "check" :
5052 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5053 "resync" : "recovery"))),
5054 per_milli/10, per_milli % 10,
4588b42e
N		 5055 (unsigned long long) resync,
5056 (unsigned long long) max_blocks);
1da177e4
LT		 5057
5058 /*
5059 * We do not want to overflow, so the order of operands and
5060 * the * 100 / 100 trick are important. We do a +1 to be
5061 * safe against division by zero. We only estimate anyway.
5062 *
5063 * dt: time from mark until now
5064 * db: blocks written from mark until now
5065 * rt: remaining time
5066 */
5067 dt = ((jiffies - mddev->resync_mark) / HZ);
5068 if (!dt) dt++;
ff4e8d9a
N		 5069 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5070 - mddev->resync_mark_cnt;
5071 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
1da177e4
LT		 5072
5073 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
5074
ff4e8d9a 5075 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
1da177e4
LT		 5076}
5077
5078static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5079{
5080 struct list_head *tmp;
5081 loff_t l = *pos;
5082 mddev_t *mddev;
5083
5084 if (l >= 0x10000)
5085 return NULL;
5086 if (!l--)
5087 /* header */
5088 return (void*)1;
5089
5090 spin_lock(&all_mddevs_lock);
5091 list_for_each(tmp,&all_mddevs)
5092 if (!l--) {
5093 mddev = list_entry(tmp, mddev_t, all_mddevs);
5094 mddev_get(mddev);
5095 spin_unlock(&all_mddevs_lock);
5096 return mddev;
5097 }
5098 spin_unlock(&all_mddevs_lock);
5099 if (!l--)
5100 return (void*)2;/* tail */
5101 return NULL;
5102}
5103
5104static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
5105{
5106 struct list_head *tmp;
5107 mddev_t *next_mddev, *mddev = v;
5108
5109 ++*pos;
5110 if (v == (void*)2)
5111 return NULL;
5112
5113 spin_lock(&all_mddevs_lock);
5114 if (v == (void*)1)
5115 tmp = all_mddevs.next;
5116 else
5117 tmp = mddev->all_mddevs.next;
5118 if (tmp != &all_mddevs)
5119 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
5120 else {
5121 next_mddev = (void*)2;
5122 *pos = 0x10000;
5123 }
5124 spin_unlock(&all_mddevs_lock);
5125
5126 if (v != (void*)1)
5127 mddev_put(mddev);
5128 return next_mddev;
5129
5130}
5131
5132static void md_seq_stop(struct seq_file *seq, void *v)
5133{
5134 mddev_t *mddev = v;
5135
5136 if (mddev && v != (void*)1 && v != (void*)2)
5137 mddev_put(mddev);
5138}
5139
d7603b7e
N		 5140struct mdstat_info {
5141 int event;
5142};
5143
1da177e4
LT		 5144static int md_seq_show(struct seq_file *seq, void *v)
5145{
5146 mddev_t *mddev = v;
5147 sector_t size;
5148 struct list_head *tmp2;
5149 mdk_rdev_t *rdev;
d7603b7e 5150 struct mdstat_info *mi = seq->private;
32a7627c 5151 struct bitmap *bitmap;
1da177e4
LT		 5152
5153 if (v == (void*)1) {
2604b703 5154 struct mdk_personality *pers;
1da177e4
LT		 5155 seq_printf(seq, "Personalities : ");
5156 spin_lock(&pers_lock);
2604b703
N		 5157 list_for_each_entry(pers, &pers_list, list)
5158 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT		 5159
5160 spin_unlock(&pers_lock);
5161 seq_printf(seq, "\n");
d7603b7e 5162 mi->event = atomic_read(&md_event_count);
1da177e4
LT		 5163 return 0;
5164 }
5165 if (v == (void*)2) {
5166 status_unused(seq);
5167 return 0;
5168 }
5169
5dc5cf7d 5170 if (mddev_lock(mddev) < 0)
1da177e4 5171 return -EINTR;
5dc5cf7d 5172
1da177e4
LT		 5173 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5174 seq_printf(seq, "%s : %sactive", mdname(mddev),
5175 mddev->pers ? "" : "in");
5176 if (mddev->pers) {
f91de92e 5177 if (mddev->ro==1)
1da177e4 5178 seq_printf(seq, " (read-only)");
f91de92e 5179 if (mddev->ro==2)
52720ae7 5180 seq_printf(seq, " (auto-read-only)");
1da177e4
LT		 5181 seq_printf(seq, " %s", mddev->pers->name);
5182 }
5183
5184 size = 0;
d089c6af 5185 rdev_for_each(rdev, tmp2, mddev) {
1da177e4
LT		 5186 char b[BDEVNAME_SIZE];
5187 seq_printf(seq, " %s[%d]",
5188 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 5189 if (test_bit(WriteMostly, &rdev->flags))
5190 seq_printf(seq, "(W)");
b2d444d7 5191 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 5192 seq_printf(seq, "(F)");
5193 continue;
b325a32e
N		 5194 } else if (rdev->raid_disk < 0)
5195 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 5196 size += rdev->size;
5197 }
5198
5199 if (!list_empty(&mddev->disks)) {
5200 if (mddev->pers)
5201 seq_printf(seq, "\n %llu blocks",
5202 (unsigned long long)mddev->array_size);
5203 else
5204 seq_printf(seq, "\n %llu blocks",
5205 (unsigned long long)size);
5206 }
1cd6bf19
N		 5207 if (mddev->persistent) {
5208 if (mddev->major_version != 0 ||
5209 mddev->minor_version != 90) {
5210 seq_printf(seq," super %d.%d",
5211 mddev->major_version,
5212 mddev->minor_version);
5213 }
e691063a
N		 5214 } else if (mddev->external)
5215 seq_printf(seq, " super external:%s",
5216 mddev->metadata_type);
5217 else
1cd6bf19 5218 seq_printf(seq, " super non-persistent");
1da177e4
LT		 5219
5220 if (mddev->pers) {
5221 mddev->pers->status (seq, mddev);
5222 seq_printf(seq, "\n ");
8e1b39d6
N		 5223 if (mddev->pers->sync_request) {
5224 if (mddev->curr_resync > 2) {
5225 status_resync (seq, mddev);
5226 seq_printf(seq, "\n ");
5227 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5228 seq_printf(seq, "\tresync=DELAYED\n ");
5229 else if (mddev->recovery_cp < MaxSector)
5230 seq_printf(seq, "\tresync=PENDING\n ");
5231 }
32a7627c
N		 5232 } else
5233 seq_printf(seq, "\n ");
5234
5235 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 5236 unsigned long chunk_kb;
5237 unsigned long flags;
32a7627c
N		 5238 spin_lock_irqsave(&bitmap->lock, flags);
5239 chunk_kb = bitmap->chunksize >> 10;
5240 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5241 "%lu%s chunk",
5242 bitmap->pages - bitmap->missing_pages,
5243 bitmap->pages,
5244 (bitmap->pages - bitmap->missing_pages)
5245 << (PAGE_SHIFT - 10),
5246 chunk_kb ? chunk_kb : bitmap->chunksize,
5247 chunk_kb ? "KB" : "B");
78d742d8
N		 5248 if (bitmap->file) {
5249 seq_printf(seq, ", file: ");
c32c2f63 5250 seq_path(seq, &bitmap->file->f_path, " \t\n");
32a7627c 5251 }
78d742d8 5252
32a7627c
N		 5253 seq_printf(seq, "\n");
5254 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 5255 }
5256
5257 seq_printf(seq, "\n");
5258 }
5259 mddev_unlock(mddev);
5260
5261 return 0;
5262}
5263
5264static struct seq_operations md_seq_ops = {
5265 .start = md_seq_start,
5266 .next = md_seq_next,
5267 .stop = md_seq_stop,
5268 .show = md_seq_show,
5269};
5270
5271static int md_seq_open(struct inode *inode, struct file *file)
5272{
5273 int error;
d7603b7e
N		 5274 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5275 if (mi == NULL)
5276 return -ENOMEM;
1da177e4
LT		 5277
5278 error = seq_open(file, &md_seq_ops);
d7603b7e
N		 5279 if (error)
5280 kfree(mi);
5281 else {
5282 struct seq_file *p = file->private_data;
5283 p->private = mi;
5284 mi->event = atomic_read(&md_event_count);
5285 }
1da177e4
LT		 5286 return error;
5287}
5288
d7603b7e
N		 5289static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5290{
5291 struct seq_file *m = filp->private_data;
5292 struct mdstat_info *mi = m->private;
5293 int mask;
5294
5295 poll_wait(filp, &md_event_waiters, wait);
5296
5297 /* always allow read */
5298 mask = POLLIN | POLLRDNORM;
5299
5300 if (mi->event != atomic_read(&md_event_count))
5301 mask |= POLLERR | POLLPRI;
5302 return mask;
5303}
5304
fa027c2a 5305static const struct file_operations md_seq_fops = {
e24650c2 5306 .owner = THIS_MODULE,
1da177e4
LT		 5307 .open = md_seq_open,
5308 .read = seq_read,
5309 .llseek = seq_lseek,
c3f94b40 5310 .release = seq_release_private,
d7603b7e 5311 .poll = mdstat_poll,
1da177e4
LT		 5312};
5313
2604b703 5314int register_md_personality(struct mdk_personality *p)
1da177e4 5315{
1da177e4 5316 spin_lock(&pers_lock);
2604b703
N		 5317 list_add_tail(&p->list, &pers_list);
5318 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
1da177e4
LT		 5319 spin_unlock(&pers_lock);
5320 return 0;
5321}
5322
2604b703 5323int unregister_md_personality(struct mdk_personality *p)
1da177e4 5324{
2604b703 5325 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 5326 spin_lock(&pers_lock);
2604b703 5327 list_del_init(&p->list);
1da177e4
LT		 5328 spin_unlock(&pers_lock);
5329 return 0;
5330}
5331
5332static int is_mddev_idle(mddev_t *mddev)
5333{
5334 mdk_rdev_t * rdev;
5335 struct list_head *tmp;
5336 int idle;
713f6ab1 5337 long curr_events;
1da177e4
LT		 5338
5339 idle = 1;
d089c6af 5340 rdev_for_each(rdev, tmp, mddev) {
1da177e4 5341 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 5342 curr_events = disk_stat_read(disk, sectors[0]) +
5343 disk_stat_read(disk, sectors[1]) -
1da177e4 5344 atomic_read(&disk->sync_io);
713f6ab1
N		 5345 /* sync IO will cause sync_io to increase before the disk_stats
5346 * as sync_io is counted when a request starts, and
5347 * disk_stats is counted when it completes.
5348 * So resync activity will cause curr_events to be smaller than
5349 * when there was no such activity.
5350 * non-sync IO will cause disk_stat to increase without
5351 * increasing sync_io so curr_events will (eventually)
5352 * be larger than it was before. Once it becomes
5353 * substantially larger, the test below will cause
5354 * the array to appear non-idle, and resync will slow
5355 * down.
5356 * If there is a lot of outstanding resync activity when
5357 * we set last_event to curr_events, then all that activity
5358 * completing might cause the array to appear non-idle
5359 * and resync will be slowed down even though there might
5360 * not have been non-resync activity. This will only
5361 * happen once though. 'last_events' will soon reflect
5362 * the state where there is little or no outstanding
5363 * resync requests, and further resync activity will
5364 * always make curr_events less than last_events.
c0e48521 5365 *
1da177e4 5366 */
713f6ab1 5367 if (curr_events - rdev->last_events > 4096) {
1da177e4
LT		 5368 rdev->last_events = curr_events;
5369 idle = 0;
5370 }
5371 }
5372 return idle;
5373}
5374
5375void md_done_sync(mddev_t *mddev, int blocks, int ok)
5376{
5377 /* another "blocks" (512byte) blocks have been synced */
5378 atomic_sub(blocks, &mddev->recovery_active);
5379 wake_up(&mddev->recovery_wait);
5380 if (!ok) {
5381 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5382 md_wakeup_thread(mddev->thread);
5383 // stop recovery, signal do_sync ....
5384 }
5385}
5386
5387
06d91a5f
N		 5388/* md_write_start(mddev, bi)
5389 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 5390 * in superblock) before writing, schedule a superblock update
5391 * and wait for it to complete.
06d91a5f 5392 */
3d310eb7 5393void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 5394{
06d91a5f 5395 if (bio_data_dir(bi) != WRITE)
3d310eb7 5396 return;
06d91a5f 5397
f91de92e
N		 5398 BUG_ON(mddev->ro == 1);
5399 if (mddev->ro == 2) {
5400 /* need to switch to read/write */
5401 mddev->ro = 0;
5402 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5403 md_wakeup_thread(mddev->thread);
25156198 5404 md_wakeup_thread(mddev->sync_thread);
f91de92e 5405 }
06d91a5f 5406 atomic_inc(&mddev->writes_pending);
31a59e34
N		 5407 if (mddev->safemode == 1)
5408 mddev->safemode = 0;
06d91a5f 5409 if (mddev->in_sync) {
a9701a30 5410 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 5411 if (mddev->in_sync) {
5412 mddev->in_sync = 0;
850b2b42 5413 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3d310eb7
N		 5414 md_wakeup_thread(mddev->thread);
5415 }
a9701a30 5416 spin_unlock_irq(&mddev->write_lock);
06d91a5f 5417 }
850b2b42 5418 wait_event(mddev->sb_wait, mddev->flags==0);
1da177e4
LT		 5419}
5420
5421void md_write_end(mddev_t *mddev)
5422{
5423 if (atomic_dec_and_test(&mddev->writes_pending)) {
5424 if (mddev->safemode == 2)
5425 md_wakeup_thread(mddev->thread);
16f17b39 5426 else if (mddev->safemode_delay)
1da177e4
LT		 5427 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5428 }
5429}
5430
2a2275d6
N		 5431/* md_allow_write(mddev)
5432 * Calling this ensures that the array is marked 'active' so that writes
5433 * may proceed without blocking. It is important to call this before
5434 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5435 * Must be called with mddev_lock held.
5436 */
5437void md_allow_write(mddev_t *mddev)
5438{
5439 if (!mddev->pers)
5440 return;
5441 if (mddev->ro)
5442 return;
5443
5444 spin_lock_irq(&mddev->write_lock);
5445 if (mddev->in_sync) {
5446 mddev->in_sync = 0;
5447 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5448 if (mddev->safemode_delay &&
5449 mddev->safemode == 0)
5450 mddev->safemode = 1;
5451 spin_unlock_irq(&mddev->write_lock);
5452 md_update_sb(mddev, 0);
5453 } else
5454 spin_unlock_irq(&mddev->write_lock);
5455}
5456EXPORT_SYMBOL_GPL(md_allow_write);
5457
75c96f85 5458static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
1da177e4
LT		 5459
5460#define SYNC_MARKS 10
5461#define SYNC_MARK_STEP (3*HZ)
29269553 5462void md_do_sync(mddev_t *mddev)
1da177e4
LT		 5463{
5464 mddev_t *mddev2;
5465 unsigned int currspeed = 0,
5466 window;
57afd89f 5467 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 5468 unsigned long mark[SYNC_MARKS];
5469 sector_t mark_cnt[SYNC_MARKS];
5470 int last_mark,m;
5471 struct list_head *tmp;
5472 sector_t last_check;
57afd89f 5473 int skipped = 0;
5fd6c1dc
N		 5474 struct list_head *rtmp;
5475 mdk_rdev_t *rdev;
61df9d91 5476 char *desc;
1da177e4
LT		 5477
5478 /* just incase thread restarts... */
5479 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5480 return;
5fd6c1dc
N		 5481 if (mddev->ro) /* never try to sync a read-only array */
5482 return;
1da177e4 5483
61df9d91
N		 5484 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5485 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5486 desc = "data-check";
5487 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5488 desc = "requested-resync";
5489 else
5490 desc = "resync";
5491 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5492 desc = "reshape";
5493 else
5494 desc = "recovery";
5495
1da177e4
LT		 5496 /* we overload curr_resync somewhat here.
5497 * 0 == not engaged in resync at all
5498 * 2 == checking that there is no conflict with another sync
5499 * 1 == like 2, but have yielded to allow conflicting resync to
5500 * commense
5501 * other == active in resync - this many blocks
5502 *
5503 * Before starting a resync we must have set curr_resync to
5504 * 2, and then checked that every "conflicting" array has curr_resync
5505 * less than ours. When we find one that is the same or higher
5506 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5507 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5508 * This will mean we have to start checking from the beginning again.
5509 *
5510 */
5511
5512 do {
5513 mddev->curr_resync = 2;
5514
5515 try_again:
787453c2 5516 if (kthread_should_stop()) {
6985c43f 5517 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 5518 goto skip;
5519 }
29ac4aa3 5520 for_each_mddev(mddev2, tmp) {
1da177e4
LT		 5521 if (mddev2 == mddev)
5522 continue;
5523 if (mddev2->curr_resync &&
5524 match_mddev_units(mddev,mddev2)) {
5525 DEFINE_WAIT(wq);
5526 if (mddev < mddev2 && mddev->curr_resync == 2) {
5527 /* arbitrarily yield */
5528 mddev->curr_resync = 1;
5529 wake_up(&resync_wait);
5530 }
5531 if (mddev > mddev2 && mddev->curr_resync == 1)
5532 /* no need to wait here, we can wait the next
5533 * time 'round when curr_resync == 2
5534 */
5535 continue;
787453c2
N		 5536 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5537 if (!kthread_should_stop() &&
8712e553 5538 mddev2->curr_resync >= mddev->curr_resync) {
61df9d91
N		 5539 printk(KERN_INFO "md: delaying %s of %s"
5540 " until %s has finished (they"
1da177e4 5541 " share one or more physical units)\n",
61df9d91 5542 desc, mdname(mddev), mdname(mddev2));
1da177e4
LT		 5543 mddev_put(mddev2);
5544 schedule();
5545 finish_wait(&resync_wait, &wq);
5546 goto try_again;
5547 }
5548 finish_wait(&resync_wait, &wq);
5549 }
5550 }
5551 } while (mddev->curr_resync < 2);
5552
5fd6c1dc 5553 j = 0;
9d88883e 5554 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 5555 /* resync follows the size requested by the personality,
57afd89f 5556 * which defaults to physical size, but can be virtual size
1da177e4
LT		 5557 */
5558 max_sectors = mddev->resync_max_sectors;
9d88883e 5559 mddev->resync_mismatches = 0;
5fd6c1dc
N		 5560 /* we don't use the checkpoint if there's a bitmap */
5561 if (!mddev->bitmap &&
5562 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5563 j = mddev->recovery_cp;
ccfcc3c1
N		 5564 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5565 max_sectors = mddev->size << 1;
5fd6c1dc 5566 else {
1da177e4
LT		 5567 /* recovery follows the physical size of devices */
5568 max_sectors = mddev->size << 1;
5fd6c1dc 5569 j = MaxSector;
d089c6af 5570 rdev_for_each(rdev, rtmp, mddev)
5fd6c1dc
N		 5571 if (rdev->raid_disk >= 0 &&
5572 !test_bit(Faulty, &rdev->flags) &&
5573 !test_bit(In_sync, &rdev->flags) &&
5574 rdev->recovery_offset < j)
5575 j = rdev->recovery_offset;
5576 }
1da177e4 5577
61df9d91
N		 5578 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5579 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5580 " %d KB/sec/disk.\n", speed_min(mddev));
338cec32 5581 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
61df9d91
N		 5582 "(but not more than %d KB/sec) for %s.\n",
5583 speed_max(mddev), desc);
1da177e4
LT		 5584
5585 is_mddev_idle(mddev); /* this also initializes IO event counters */
5fd6c1dc 5586
57afd89f 5587 io_sectors = 0;
1da177e4
LT		 5588 for (m = 0; m < SYNC_MARKS; m++) {
5589 mark[m] = jiffies;
57afd89f 5590 mark_cnt[m] = io_sectors;
1da177e4
LT		 5591 }
5592 last_mark = 0;
5593 mddev->resync_mark = mark[last_mark];
5594 mddev->resync_mark_cnt = mark_cnt[last_mark];
5595
5596 /*
5597 * Tune reconstruction:
5598 */
5599 window = 32*(PAGE_SIZE/512);
5600 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5601 window/2,(unsigned long long) max_sectors/2);
5602
5603 atomic_set(&mddev->recovery_active, 0);
5604 init_waitqueue_head(&mddev->recovery_wait);
5605 last_check = 0;
5606
5607 if (j>2) {
5608 printk(KERN_INFO
61df9d91
N		 5609 "md: resuming %s of %s from checkpoint.\n",
5610 desc, mdname(mddev));
1da177e4
LT		 5611 mddev->curr_resync = j;
5612 }
5613
5614 while (j < max_sectors) {
57afd89f 5615 sector_t sectors;
1da177e4 5616
57afd89f 5617 skipped = 0;
c6207277
N		 5618 if (j >= mddev->resync_max) {
5619 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5620 wait_event(mddev->recovery_wait,
5621 mddev->resync_max > j
5622 || kthread_should_stop());
5623 }
5624 if (kthread_should_stop())
5625 goto interrupted;
57afd89f 5626 sectors = mddev->pers->sync_request(mddev, j, &skipped,
c6207277 5627 currspeed < speed_min(mddev));
57afd89f 5628 if (sectors == 0) {
1da177e4
LT		 5629 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5630 goto out;
5631 }
57afd89f
N		 5632
5633 if (!skipped) { /* actual IO requested */
5634 io_sectors += sectors;
5635 atomic_add(sectors, &mddev->recovery_active);
5636 }
5637
1da177e4
LT		 5638 j += sectors;
5639 if (j>1) mddev->curr_resync = j;
ff4e8d9a 5640 mddev->curr_mark_cnt = io_sectors;
d7603b7e
N		 5641 if (last_check == 0)
5642 /* this is the earliers that rebuilt will be
5643 * visible in /proc/mdstat
5644 */
5645 md_new_event(mddev);
57afd89f
N		 5646
5647 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 5648 continue;
5649
57afd89f 5650 last_check = io_sectors;
1da177e4
LT		 5651
5652 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
5653 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
5654 break;
5655
5656 repeat:
5657 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5658 /* step marks */
5659 int next = (last_mark+1) % SYNC_MARKS;
5660
5661 mddev->resync_mark = mark[next];
5662 mddev->resync_mark_cnt = mark_cnt[next];
5663 mark[next] = jiffies;
57afd89f 5664 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 5665 last_mark = next;
5666 }
5667
5668
c6207277
N		 5669 if (kthread_should_stop())
5670 goto interrupted;
5671
1da177e4
LT		 5672
5673 /*
5674 * this loop exits only if either when we are slower than
5675 * the 'hard' speed limit, or the system was IO-idle for
5676 * a jiffy.
5677 * the system might be non-idle CPU-wise, but we only care
5678 * about not overloading the IO subsystem. (things like an
5679 * e2fsck being done on the RAID array should execute fast)
5680 */
2ad8b1ef 5681 blk_unplug(mddev->queue);
1da177e4
LT		 5682 cond_resched();
5683
57afd89f
N		 5684 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5685 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4 5686
88202a0c
N		 5687 if (currspeed > speed_min(mddev)) {
5688 if ((currspeed > speed_max(mddev)) ||
1da177e4 5689 !is_mddev_idle(mddev)) {
c0e48521 5690 msleep(500);
1da177e4
LT		 5691 goto repeat;
5692 }
5693 }
5694 }
61df9d91 5695 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
1da177e4
LT		 5696 /*
5697 * this also signals 'finished resyncing' to md_stop
5698 */
5699 out:
2ad8b1ef 5700 blk_unplug(mddev->queue);
1da177e4
LT		 5701
5702 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5703
5704 /* tell personality that we are finished */
57afd89f 5705 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 5706
5707 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
ccfcc3c1 5708 !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5fd6c1dc
N		 5709 mddev->curr_resync > 2) {
5710 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5711 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5712 if (mddev->curr_resync >= mddev->recovery_cp) {
5713 printk(KERN_INFO
61df9d91
N		 5714 "md: checkpointing %s of %s.\n",
5715 desc, mdname(mddev));
5fd6c1dc
N		 5716 mddev->recovery_cp = mddev->curr_resync;
5717 }
5718 } else
5719 mddev->recovery_cp = MaxSector;
5720 } else {
5721 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5722 mddev->curr_resync = MaxSector;
d089c6af 5723 rdev_for_each(rdev, rtmp, mddev)
5fd6c1dc
N		 5724 if (rdev->raid_disk >= 0 &&
5725 !test_bit(Faulty, &rdev->flags) &&
5726 !test_bit(In_sync, &rdev->flags) &&
5727 rdev->recovery_offset < mddev->curr_resync)
5728 rdev->recovery_offset = mddev->curr_resync;
5fd6c1dc 5729 }
1da177e4 5730 }
17571284 5731 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 5732
1da177e4
LT		 5733 skip:
5734 mddev->curr_resync = 0;
c6207277
N		 5735 mddev->resync_max = MaxSector;
5736 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
1da177e4
LT		 5737 wake_up(&resync_wait);
5738 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5739 md_wakeup_thread(mddev->thread);
c6207277
N		 5740 return;
5741
5742 interrupted:
5743 /*
5744 * got a signal, exit.
5745 */
5746 printk(KERN_INFO
5747 "md: md_do_sync() got signal ... exiting\n");
5748 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5749 goto out;
5750
1da177e4 5751}
29269553 5752EXPORT_SYMBOL_GPL(md_do_sync);
1da177e4
LT		 5753
5754
b4c4c7b8
N		 5755static int remove_and_add_spares(mddev_t *mddev)
5756{
5757 mdk_rdev_t *rdev;
5758 struct list_head *rtmp;
5759 int spares = 0;
5760
d089c6af 5761 rdev_for_each(rdev, rtmp, mddev)
b4c4c7b8 5762 if (rdev->raid_disk >= 0 &&
c303da6d 5763 !mddev->external &&
b4c4c7b8
N		 5764 (test_bit(Faulty, &rdev->flags) ||
5765 ! test_bit(In_sync, &rdev->flags)) &&
5766 atomic_read(&rdev->nr_pending)==0) {
5767 if (mddev->pers->hot_remove_disk(
5768 mddev, rdev->raid_disk)==0) {
5769 char nm[20];
5770 sprintf(nm,"rd%d", rdev->raid_disk);
5771 sysfs_remove_link(&mddev->kobj, nm);
5772 rdev->raid_disk = -1;
5773 }
5774 }
5775
5776 if (mddev->degraded) {
d089c6af 5777 rdev_for_each(rdev, rtmp, mddev)
b4c4c7b8
N		 5778 if (rdev->raid_disk < 0
5779 && !test_bit(Faulty, &rdev->flags)) {
5780 rdev->recovery_offset = 0;
5781 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5782 char nm[20];
5783 sprintf(nm, "rd%d", rdev->raid_disk);
5e55e2f5
N		 5784 if (sysfs_create_link(&mddev->kobj,
5785 &rdev->kobj, nm))
5786 printk(KERN_WARNING
5787 "md: cannot register "
5788 "%s for %s\n",
5789 nm, mdname(mddev));
b4c4c7b8
N		 5790 spares++;
5791 md_new_event(mddev);
5792 } else
5793 break;
5794 }
5795 }
5796 return spares;
5797}
1da177e4
LT		 5798/*
5799 * This routine is regularly called by all per-raid-array threads to
5800 * deal with generic issues like resync and super-block update.
5801 * Raid personalities that don't have a thread (linear/raid0) do not
5802 * need this as they never do any recovery or update the superblock.
5803 *
5804 * It does not do any resync itself, but rather "forks" off other threads
5805 * to do that as needed.
5806 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5807 * "->recovery" and create a thread at ->sync_thread.
5808 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5809 * and wakeups up this thread which will reap the thread and finish up.
5810 * This thread also removes any faulty devices (with nr_pending == 0).
5811 *
5812 * The overall approach is:
5813 * 1/ if the superblock needs updating, update it.
5814 * 2/ If a recovery thread is running, don't do anything else.
5815 * 3/ If recovery has finished, clean up, possibly marking spares active.
5816 * 4/ If there are any faulty devices, remove them.
5817 * 5/ If array is degraded, try to add spares devices
5818 * 6/ If array has spares or is not in-sync, start a resync thread.
5819 */
5820void md_check_recovery(mddev_t *mddev)
5821{
5822 mdk_rdev_t *rdev;
5823 struct list_head *rtmp;
5824
5825
5f40402d
N		 5826 if (mddev->bitmap)
5827 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 5828
5829 if (mddev->ro)
5830 return;
fca4d848
N		 5831
5832 if (signal_pending(current)) {
31a59e34 5833 if (mddev->pers->sync_request && !mddev->external) {
fca4d848
N		 5834 printk(KERN_INFO "md: %s in immediate safe mode\n",
5835 mdname(mddev));
5836 mddev->safemode = 2;
5837 }
5838 flush_signals(current);
5839 }
5840
1da177e4 5841 if ( ! (
e691063a 5842 (mddev->flags && !mddev->external) ||
1da177e4 5843 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848 5844 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
31a59e34 5845 (mddev->external == 0 && mddev->safemode == 1) ||
fca4d848
N		 5846 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5847 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 5848 ))
5849 return;
fca4d848 5850
df5b89b3 5851 if (mddev_trylock(mddev)) {
b4c4c7b8 5852 int spares = 0;
fca4d848 5853
31a59e34
N		 5854 if (!mddev->external) {
5855 spin_lock_irq(&mddev->write_lock);
5856 if (mddev->safemode &&
5857 !atomic_read(&mddev->writes_pending) &&
5858 !mddev->in_sync &&
5859 mddev->recovery_cp == MaxSector) {
5860 mddev->in_sync = 1;
5861 if (mddev->persistent)
5862 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5863 }
5864 if (mddev->safemode == 1)
5865 mddev->safemode = 0;
5866 spin_unlock_irq(&mddev->write_lock);
fca4d848 5867 }
fca4d848 5868
850b2b42
N		 5869 if (mddev->flags)
5870 md_update_sb(mddev, 0);
06d91a5f 5871
06d91a5f 5872
1da177e4
LT		 5873 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
5874 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
5875 /* resync/recovery still happening */
5876 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5877 goto unlock;
5878 }
5879 if (mddev->sync_thread) {
5880 /* resync has finished, collect result */
5881 md_unregister_thread(mddev->sync_thread);
5882 mddev->sync_thread = NULL;
5883 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5884 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5885 /* success...*/
5886 /* activate any spares */
5887 mddev->pers->spare_active(mddev);
5888 }
850b2b42 5889 md_update_sb(mddev, 1);
41158c7e
N		 5890
5891 /* if array is no-longer degraded, then any saved_raid_disk
5892 * information must be scrapped
5893 */
5894 if (!mddev->degraded)
d089c6af 5895 rdev_for_each(rdev, rtmp, mddev)
41158c7e
N		 5896 rdev->saved_raid_disk = -1;
5897
1da177e4
LT		 5898 mddev->recovery = 0;
5899 /* flag recovery needed just to double check */
5900 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
d7603b7e 5901 md_new_event(mddev);
1da177e4
LT		 5902 goto unlock;
5903 }
24dd469d
N		 5904 /* Clear some bits that don't mean anything, but
5905 * might be left set
5906 */
5907 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5908 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
5909 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
5910 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4 5911
5fd6c1dc
N		 5912 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5913 goto unlock;
1da177e4
LT		 5914 /* no recovery is running.
5915 * remove any failed drives, then
5916 * add spares if possible.
5917 * Spare are also removed and re-added, to allow
5918 * the personality to fail the re-add.
5919 */
1da177e4 5920
b4c4c7b8
N		 5921 if (mddev->reshape_position != MaxSector) {
5922 if (mddev->pers->check_reshape(mddev) != 0)
5923 /* Cannot proceed */
5924 goto unlock;
5925 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
5926 } else if ((spares = remove_and_add_spares(mddev))) {
24dd469d
N		 5927 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5928 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5929 } else if (mddev->recovery_cp < MaxSector) {
5930 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5931 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5932 /* nothing to be done ... */
1da177e4 5933 goto unlock;
24dd469d 5934
1da177e4
LT		 5935 if (mddev->pers->sync_request) {
5936 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 5937 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
5938 /* We are adding a device or devices to an array
5939 * which has the bitmap stored on all devices.
5940 * So make sure all bitmap pages get written
5941 */
5942 bitmap_write_all(mddev->bitmap);
5943 }
1da177e4
LT		 5944 mddev->sync_thread = md_register_thread(md_do_sync,
5945 mddev,
5946 "%s_resync");
5947 if (!mddev->sync_thread) {
5948 printk(KERN_ERR "%s: could not start resync"
5949 " thread...\n",
5950 mdname(mddev));
5951 /* leave the spares where they are, it shouldn't hurt */
5952 mddev->recovery = 0;
d7603b7e 5953 } else
1da177e4 5954 md_wakeup_thread(mddev->sync_thread);
d7603b7e 5955 md_new_event(mddev);
1da177e4
LT		 5956 }
5957 unlock:
5958 mddev_unlock(mddev);
5959 }
5960}
5961
75c96f85
AB		 5962static int md_notify_reboot(struct notifier_block *this,
5963 unsigned long code, void *x)
1da177e4
LT		 5964{
5965 struct list_head *tmp;
5966 mddev_t *mddev;
5967
5968 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
5969
5970 printk(KERN_INFO "md: stopping all md devices.\n");
5971
29ac4aa3 5972 for_each_mddev(mddev, tmp)
c71d4887 5973 if (mddev_trylock(mddev)) {
1da177e4 5974 do_md_stop (mddev, 1);
c71d4887
NB		 5975 mddev_unlock(mddev);
5976 }
1da177e4
LT		 5977 /*
5978 * certain more exotic SCSI devices are known to be
5979 * volatile wrt too early system reboots. While the
5980 * right place to handle this issue is the given
5981 * driver, we do want to have a safe RAID driver ...
5982 */
5983 mdelay(1000*1);
5984 }
5985 return NOTIFY_DONE;
5986}
5987
75c96f85 5988static struct notifier_block md_notifier = {
1da177e4
LT		 5989 .notifier_call = md_notify_reboot,
5990 .next = NULL,
5991 .priority = INT_MAX, /* before any real devices */
5992};
5993
5994static void md_geninit(void)
5995{
1da177e4
LT		 5996 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5997
c7705f34 5998 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
1da177e4
LT		 5999}
6000
75c96f85 6001static int __init md_init(void)
1da177e4 6002{
1da177e4
LT		 6003 if (register_blkdev(MAJOR_NR, "md"))
6004 return -1;
6005 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
6006 unregister_blkdev(MAJOR_NR, "md");
6007 return -1;
6008 }
e8703fe1
N		 6009 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
6010 md_probe, NULL, NULL);
6011 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
1da177e4
LT		 6012 md_probe, NULL, NULL);
6013
1da177e4 6014 register_reboot_notifier(&md_notifier);
0b4d4147 6015 raid_table_header = register_sysctl_table(raid_root_table);
1da177e4
LT		 6016
6017 md_geninit();
6018 return (0);
6019}
6020
6021
6022#ifndef MODULE
6023
6024/*
6025 * Searches all registered partitions for autorun RAID arrays
6026 * at boot time.
6027 */
4d936ec1
ME		 6028
6029static LIST_HEAD(all_detected_devices);
6030struct detected_devices_node {
6031 struct list_head list;
6032 dev_t dev;
6033};
1da177e4
LT		 6034
6035void md_autodetect_dev(dev_t dev)
6036{
4d936ec1
ME		 6037 struct detected_devices_node *node_detected_dev;
6038
6039 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
6040 if (node_detected_dev) {
6041 node_detected_dev->dev = dev;
6042 list_add_tail(&node_detected_dev->list, &all_detected_devices);
6043 } else {
6044 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
6045 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
6046 }
1da177e4
LT		 6047}
6048
6049
6050static void autostart_arrays(int part)
6051{
6052 mdk_rdev_t *rdev;
4d936ec1
ME		 6053 struct detected_devices_node *node_detected_dev;
6054 dev_t dev;
6055 int i_scanned, i_passed;
1da177e4 6056
4d936ec1
ME		 6057 i_scanned = 0;
6058 i_passed = 0;
1da177e4 6059
4d936ec1 6060 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
1da177e4 6061
4d936ec1
ME		 6062 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6063 i_scanned++;
6064 node_detected_dev = list_entry(all_detected_devices.next,
6065 struct detected_devices_node, list);
6066 list_del(&node_detected_dev->list);
6067 dev = node_detected_dev->dev;
6068 kfree(node_detected_dev);
df968c4e 6069 rdev = md_import_device(dev,0, 90);
1da177e4
LT		 6070 if (IS_ERR(rdev))
6071 continue;
6072
b2d444d7 6073 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 6074 MD_BUG();
6075 continue;
6076 }
d0fae18f 6077 set_bit(AutoDetected, &rdev->flags);
1da177e4 6078 list_add(&rdev->same_set, &pending_raid_disks);
4d936ec1 6079 i_passed++;
1da177e4 6080 }
4d936ec1
ME		 6081
6082 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6083 i_scanned, i_passed);
1da177e4
LT		 6084
6085 autorun_devices(part);
6086}
6087
fdee8ae4 6088#endif /* !MODULE */
1da177e4
LT		 6089
6090static __exit void md_exit(void)
6091{
6092 mddev_t *mddev;
6093 struct list_head *tmp;
8ab5e4c1 6094
e8703fe1
N		 6095 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
6096 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
1da177e4
LT		 6097
6098 unregister_blkdev(MAJOR_NR,"md");
6099 unregister_blkdev(mdp_major, "mdp");
6100 unregister_reboot_notifier(&md_notifier);
6101 unregister_sysctl_table(raid_table_header);
6102 remove_proc_entry("mdstat", NULL);
29ac4aa3 6103 for_each_mddev(mddev, tmp) {
1da177e4
LT		 6104 struct gendisk *disk = mddev->gendisk;
6105 if (!disk)
6106 continue;
6107 export_array(mddev);
6108 del_gendisk(disk);
6109 put_disk(disk);
6110 mddev->gendisk = NULL;
6111 mddev_put(mddev);
6112 }
6113}
6114
685784aa 6115subsys_initcall(md_init);
1da177e4
LT		 6116module_exit(md_exit)
6117
f91de92e
N		 6118static int get_ro(char *buffer, struct kernel_param *kp)
6119{
6120 return sprintf(buffer, "%d", start_readonly);
6121}
6122static int set_ro(const char *val, struct kernel_param *kp)
6123{
6124 char *e;
6125 int num = simple_strtoul(val, &e, 10);
6126 if (*val && (*e == '\0' || *e == '\n')) {
6127 start_readonly = num;
4dbcdc75 6128 return 0;
f91de92e
N		 6129 }
6130 return -EINVAL;
6131}
6132
80ca3a44
N		 6133module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6134module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6ff8d8ec 6135
f91de92e 6136
1da177e4
LT		 6137EXPORT_SYMBOL(register_md_personality);
6138EXPORT_SYMBOL(unregister_md_personality);
6139EXPORT_SYMBOL(md_error);
6140EXPORT_SYMBOL(md_done_sync);
6141EXPORT_SYMBOL(md_write_start);
6142EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 6143EXPORT_SYMBOL(md_register_thread);
6144EXPORT_SYMBOL(md_unregister_thread);
6145EXPORT_SYMBOL(md_wakeup_thread);
1da177e4
LT		 6146EXPORT_SYMBOL(md_check_recovery);
6147MODULE_LICENSE("GPL");
aa1595e9 6148MODULE_ALIAS("md");
72008652 6149MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
kernel source for telekom puls (alcatel/mediatek)