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md: remove the slash from the name of a kmem_cache used by raid5
[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 */
198#define ITERATE_MDDEV(mddev,tmp) \
199 \
200 for (({ spin_lock(&all_mddevs_lock); \
201 tmp = all_mddevs.next; \
202 mddev = NULL;}); \
203 ({ if (tmp != &all_mddevs) \
204 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
205 spin_unlock(&all_mddevs_lock); \
206 if (mddev) mddev_put(mddev); \
207 mddev = list_entry(tmp, mddev_t, all_mddevs); \
208 tmp != &all_mddevs;}); \
209 ({ spin_lock(&all_mddevs_lock); \
210 tmp = tmp->next;}) \
211 )
212
213
214static int md_fail_request (request_queue_t *q, struct bio *bio)
215{
216 bio_io_error(bio, bio->bi_size);
217 return 0;
218}
219
220static inline mddev_t *mddev_get(mddev_t *mddev)
221{
222 atomic_inc(&mddev->active);
223 return mddev;
224}
225
226static void mddev_put(mddev_t *mddev)
227{
228 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
229 return;
230 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
231 list_del(&mddev->all_mddevs);
926ce2d8 232 spin_unlock(&all_mddevs_lock);
1312f40e 233 blk_cleanup_queue(mddev->queue);
eae1701f 234 kobject_unregister(&mddev->kobj);
926ce2d8
N		 235 } else
236 spin_unlock(&all_mddevs_lock);
1da177e4
LT		 237}
238
239static mddev_t * mddev_find(dev_t unit)
240{
241 mddev_t *mddev, *new = NULL;
242
243 retry:
244 spin_lock(&all_mddevs_lock);
245 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
246 if (mddev->unit == unit) {
247 mddev_get(mddev);
248 spin_unlock(&all_mddevs_lock);
990a8baf 249 kfree(new);
1da177e4
LT		 250 return mddev;
251 }
252
253 if (new) {
254 list_add(&new->all_mddevs, &all_mddevs);
255 spin_unlock(&all_mddevs_lock);
256 return new;
257 }
258 spin_unlock(&all_mddevs_lock);
259
9ffae0cf 260 new = kzalloc(sizeof(*new), GFP_KERNEL);
1da177e4
LT		 261 if (!new)
262 return NULL;
263
1da177e4
LT		 264 new->unit = unit;
265 if (MAJOR(unit) == MD_MAJOR)
266 new->md_minor = MINOR(unit);
267 else
268 new->md_minor = MINOR(unit) >> MdpMinorShift;
269
df5b89b3 270 mutex_init(&new->reconfig_mutex);
1da177e4
LT		 271 INIT_LIST_HEAD(&new->disks);
272 INIT_LIST_HEAD(&new->all_mddevs);
273 init_timer(&new->safemode_timer);
274 atomic_set(&new->active, 1);
06d91a5f 275 spin_lock_init(&new->write_lock);
3d310eb7 276 init_waitqueue_head(&new->sb_wait);
1da177e4
LT		 277
278 new->queue = blk_alloc_queue(GFP_KERNEL);
279 if (!new->queue) {
280 kfree(new);
281 return NULL;
282 }
89e5c8b5 283 set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags);
1da177e4
LT		 284
285 blk_queue_make_request(new->queue, md_fail_request);
286
287 goto retry;
288}
289
290static inline int mddev_lock(mddev_t * mddev)
291{
df5b89b3 292 return mutex_lock_interruptible(&mddev->reconfig_mutex);
1da177e4
LT		 293}
294
1da177e4
LT		 295static inline int mddev_trylock(mddev_t * mddev)
296{
df5b89b3 297 return mutex_trylock(&mddev->reconfig_mutex);
1da177e4
LT		 298}
299
300static inline void mddev_unlock(mddev_t * mddev)
301{
df5b89b3 302 mutex_unlock(&mddev->reconfig_mutex);
1da177e4 303
005eca5e 304 md_wakeup_thread(mddev->thread);
1da177e4
LT		 305}
306
2989ddbd 307static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
1da177e4
LT		 308{
309 mdk_rdev_t * rdev;
310 struct list_head *tmp;
311
312 ITERATE_RDEV(mddev,rdev,tmp) {
313 if (rdev->desc_nr == nr)
314 return rdev;
315 }
316 return NULL;
317}
318
319static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
320{
321 struct list_head *tmp;
322 mdk_rdev_t *rdev;
323
324 ITERATE_RDEV(mddev,rdev,tmp) {
325 if (rdev->bdev->bd_dev == dev)
326 return rdev;
327 }
328 return NULL;
329}
330
d9d166c2 331static struct mdk_personality *find_pers(int level, char *clevel)
2604b703
N		 332{
333 struct mdk_personality *pers;
d9d166c2
N		 334 list_for_each_entry(pers, &pers_list, list) {
335 if (level != LEVEL_NONE && pers->level == level)
2604b703 336 return pers;
d9d166c2
N		 337 if (strcmp(pers->name, clevel)==0)
338 return pers;
339 }
2604b703
N		 340 return NULL;
341}
342
77933d72 343static inline sector_t calc_dev_sboffset(struct block_device *bdev)
1da177e4
LT		 344{
345 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
346 return MD_NEW_SIZE_BLOCKS(size);
347}
348
349static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
350{
351 sector_t size;
352
353 size = rdev->sb_offset;
354
355 if (chunk_size)
356 size &= ~((sector_t)chunk_size/1024 - 1);
357 return size;
358}
359
360static int alloc_disk_sb(mdk_rdev_t * rdev)
361{
362 if (rdev->sb_page)
363 MD_BUG();
364
365 rdev->sb_page = alloc_page(GFP_KERNEL);
366 if (!rdev->sb_page) {
367 printk(KERN_ALERT "md: out of memory.\n");
368 return -EINVAL;
369 }
370
371 return 0;
372}
373
374static void free_disk_sb(mdk_rdev_t * rdev)
375{
376 if (rdev->sb_page) {
2d1f3b5d 377 put_page(rdev->sb_page);
1da177e4
LT		 378 rdev->sb_loaded = 0;
379 rdev->sb_page = NULL;
380 rdev->sb_offset = 0;
381 rdev->size = 0;
382 }
383}
384
385
7bfa19f2
N		 386static int super_written(struct bio *bio, unsigned int bytes_done, int error)
387{
388 mdk_rdev_t *rdev = bio->bi_private;
a9701a30 389 mddev_t *mddev = rdev->mddev;
7bfa19f2
N		 390 if (bio->bi_size)
391 return 1;
392
3a0f5bbb
N		 393 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
394 printk("md: super_written gets error=%d, uptodate=%d\n",
395 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
396 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
a9701a30 397 md_error(mddev, rdev);
3a0f5bbb 398 }
7bfa19f2 399
a9701a30
N		 400 if (atomic_dec_and_test(&mddev->pending_writes))
401 wake_up(&mddev->sb_wait);
f8b58edf 402 bio_put(bio);
7bfa19f2
N		 403 return 0;
404}
405
a9701a30
N		 406static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
407{
408 struct bio *bio2 = bio->bi_private;
409 mdk_rdev_t *rdev = bio2->bi_private;
410 mddev_t *mddev = rdev->mddev;
411 if (bio->bi_size)
412 return 1;
413
414 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
415 error == -EOPNOTSUPP) {
416 unsigned long flags;
417 /* barriers don't appear to be supported :-( */
418 set_bit(BarriersNotsupp, &rdev->flags);
419 mddev->barriers_work = 0;
420 spin_lock_irqsave(&mddev->write_lock, flags);
421 bio2->bi_next = mddev->biolist;
422 mddev->biolist = bio2;
423 spin_unlock_irqrestore(&mddev->write_lock, flags);
424 wake_up(&mddev->sb_wait);
425 bio_put(bio);
426 return 0;
427 }
428 bio_put(bio2);
429 bio->bi_private = rdev;
430 return super_written(bio, bytes_done, error);
431}
432
7bfa19f2
N		 433void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
434 sector_t sector, int size, struct page *page)
435{
436 /* write first size bytes of page to sector of rdev
437 * Increment mddev->pending_writes before returning
438 * and decrement it on completion, waking up sb_wait
439 * if zero is reached.
440 * If an error occurred, call md_error
a9701a30
N		 441 *
442 * As we might need to resubmit the request if BIO_RW_BARRIER
443 * causes ENOTSUPP, we allocate a spare bio...
7bfa19f2
N		 444 */
445 struct bio *bio = bio_alloc(GFP_NOIO, 1);
a9701a30 446 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
7bfa19f2
N		 447
448 bio->bi_bdev = rdev->bdev;
449 bio->bi_sector = sector;
450 bio_add_page(bio, page, size, 0);
451 bio->bi_private = rdev;
452 bio->bi_end_io = super_written;
a9701a30
N		 453 bio->bi_rw = rw;
454
7bfa19f2 455 atomic_inc(&mddev->pending_writes);
a9701a30
N		 456 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
457 struct bio *rbio;
458 rw |= (1<<BIO_RW_BARRIER);
459 rbio = bio_clone(bio, GFP_NOIO);
460 rbio->bi_private = bio;
461 rbio->bi_end_io = super_written_barrier;
462 submit_bio(rw, rbio);
463 } else
464 submit_bio(rw, bio);
465}
466
467void md_super_wait(mddev_t *mddev)
468{
469 /* wait for all superblock writes that were scheduled to complete.
470 * if any had to be retried (due to BARRIER problems), retry them
471 */
472 DEFINE_WAIT(wq);
473 for(;;) {
474 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
475 if (atomic_read(&mddev->pending_writes)==0)
476 break;
477 while (mddev->biolist) {
478 struct bio *bio;
479 spin_lock_irq(&mddev->write_lock);
480 bio = mddev->biolist;
481 mddev->biolist = bio->bi_next ;
482 bio->bi_next = NULL;
483 spin_unlock_irq(&mddev->write_lock);
484 submit_bio(bio->bi_rw, bio);
485 }
486 schedule();
487 }
488 finish_wait(&mddev->sb_wait, &wq);
7bfa19f2
N		 489}
490
1da177e4
LT		 491static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
492{
493 if (bio->bi_size)
494 return 1;
495
496 complete((struct completion*)bio->bi_private);
497 return 0;
498}
499
a654b9d8 500int sync_page_io(struct block_device *bdev, sector_t sector, int size,
1da177e4
LT		 501 struct page *page, int rw)
502{
baaa2c51 503 struct bio *bio = bio_alloc(GFP_NOIO, 1);
1da177e4
LT		 504 struct completion event;
505 int ret;
506
507 rw |= (1 << BIO_RW_SYNC);
508
509 bio->bi_bdev = bdev;
510 bio->bi_sector = sector;
511 bio_add_page(bio, page, size, 0);
512 init_completion(&event);
513 bio->bi_private = &event;
514 bio->bi_end_io = bi_complete;
515 submit_bio(rw, bio);
516 wait_for_completion(&event);
517
518 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
519 bio_put(bio);
520 return ret;
521}
a8745db2 522EXPORT_SYMBOL_GPL(sync_page_io);
1da177e4 523
0002b271 524static int read_disk_sb(mdk_rdev_t * rdev, int size)
1da177e4
LT		 525{
526 char b[BDEVNAME_SIZE];
527 if (!rdev->sb_page) {
528 MD_BUG();
529 return -EINVAL;
530 }
531 if (rdev->sb_loaded)
532 return 0;
533
534
0002b271 535 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
1da177e4
LT		 536 goto fail;
537 rdev->sb_loaded = 1;
538 return 0;
539
540fail:
541 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
542 bdevname(rdev->bdev,b));
543 return -EINVAL;
544}
545
546static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
547{
548 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
549 (sb1->set_uuid1 == sb2->set_uuid1) &&
550 (sb1->set_uuid2 == sb2->set_uuid2) &&
551 (sb1->set_uuid3 == sb2->set_uuid3))
552
553 return 1;
554
555 return 0;
556}
557
558
559static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
560{
561 int ret;
562 mdp_super_t *tmp1, *tmp2;
563
564 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
565 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
566
567 if (!tmp1 || !tmp2) {
568 ret = 0;
569 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
570 goto abort;
571 }
572
573 *tmp1 = *sb1;
574 *tmp2 = *sb2;
575
576 /*
577 * nr_disks is not constant
578 */
579 tmp1->nr_disks = 0;
580 tmp2->nr_disks = 0;
581
582 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
583 ret = 0;
584 else
585 ret = 1;
586
587abort:
990a8baf
JJ		 588 kfree(tmp1);
589 kfree(tmp2);
1da177e4
LT		 590 return ret;
591}
592
4d167f09
N		 593
594static u32 md_csum_fold(u32 csum)
595{
596 csum = (csum & 0xffff) + (csum >> 16);
597 return (csum & 0xffff) + (csum >> 16);
598}
599
1da177e4
LT		 600static unsigned int calc_sb_csum(mdp_super_t * sb)
601{
4d167f09
N		 602 u64 newcsum = 0;
603 u32 *sb32 = (u32*)sb;
604 int i;
1da177e4
LT		 605 unsigned int disk_csum, csum;
606
607 disk_csum = sb->sb_csum;
608 sb->sb_csum = 0;
4d167f09
N		 609
610 for (i = 0; i < MD_SB_BYTES/4 ; i++)
611 newcsum += sb32[i];
612 csum = (newcsum & 0xffffffff) + (newcsum>>32);
613
614
615#ifdef CONFIG_ALPHA
616 /* This used to use csum_partial, which was wrong for several
617 * reasons including that different results are returned on
618 * different architectures. It isn't critical that we get exactly
619 * the same return value as before (we always csum_fold before
620 * testing, and that removes any differences). However as we
621 * know that csum_partial always returned a 16bit value on
622 * alphas, do a fold to maximise conformity to previous behaviour.
623 */
624 sb->sb_csum = md_csum_fold(disk_csum);
625#else
1da177e4 626 sb->sb_csum = disk_csum;
4d167f09 627#endif
1da177e4
LT		 628 return csum;
629}
630
631
632/*
633 * Handle superblock details.
634 * We want to be able to handle multiple superblock formats
635 * so we have a common interface to them all, and an array of
636 * different handlers.
637 * We rely on user-space to write the initial superblock, and support
638 * reading and updating of superblocks.
639 * Interface methods are:
640 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
641 * loads and validates a superblock on dev.
642 * if refdev != NULL, compare superblocks on both devices
643 * Return:
644 * 0 - dev has a superblock that is compatible with refdev
645 * 1 - dev has a superblock that is compatible and newer than refdev
646 * so dev should be used as the refdev in future
647 * -EINVAL superblock incompatible or invalid
648 * -othererror e.g. -EIO
649 *
650 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
651 * Verify that dev is acceptable into mddev.
652 * The first time, mddev->raid_disks will be 0, and data from
653 * dev should be merged in. Subsequent calls check that dev
654 * is new enough. Return 0 or -EINVAL
655 *
656 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
657 * Update the superblock for rdev with data in mddev
658 * This does not write to disc.
659 *
660 */
661
662struct super_type {
663 char *name;
664 struct module *owner;
665 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
666 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
667 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
668};
669
670/*
671 * load_super for 0.90.0
672 */
673static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
674{
675 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
676 mdp_super_t *sb;
677 int ret;
678 sector_t sb_offset;
679
680 /*
681 * Calculate the position of the superblock,
682 * it's at the end of the disk.
683 *
684 * It also happens to be a multiple of 4Kb.
685 */
686 sb_offset = calc_dev_sboffset(rdev->bdev);
687 rdev->sb_offset = sb_offset;
688
0002b271 689 ret = read_disk_sb(rdev, MD_SB_BYTES);
1da177e4
LT		 690 if (ret) return ret;
691
692 ret = -EINVAL;
693
694 bdevname(rdev->bdev, b);
695 sb = (mdp_super_t*)page_address(rdev->sb_page);
696
697 if (sb->md_magic != MD_SB_MAGIC) {
698 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
699 b);
700 goto abort;
701 }
702
703 if (sb->major_version != 0 ||
f6705578
N		 704 sb->minor_version < 90 ||
705 sb->minor_version > 91) {
1da177e4
LT		 706 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
707 sb->major_version, sb->minor_version,
708 b);
709 goto abort;
710 }
711
712 if (sb->raid_disks <= 0)
713 goto abort;
714
4d167f09 715 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1da177e4
LT		 716 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
717 b);
718 goto abort;
719 }
720
721 rdev->preferred_minor = sb->md_minor;
722 rdev->data_offset = 0;
0002b271 723 rdev->sb_size = MD_SB_BYTES;
1da177e4 724
e11e93fa
N		 725 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
726 if (sb->level != 1 && sb->level != 4
727 && sb->level != 5 && sb->level != 6
728 && sb->level != 10) {
729 /* FIXME use a better test */
730 printk(KERN_WARNING
731 "md: bitmaps not supported for this level.\n");
732 goto abort;
733 }
734 }
735
1da177e4
LT		 736 if (sb->level == LEVEL_MULTIPATH)
737 rdev->desc_nr = -1;
738 else
739 rdev->desc_nr = sb->this_disk.number;
740
741 if (refdev == 0)
742 ret = 1;
743 else {
744 __u64 ev1, ev2;
745 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
746 if (!uuid_equal(refsb, sb)) {
747 printk(KERN_WARNING "md: %s has different UUID to %s\n",
748 b, bdevname(refdev->bdev,b2));
749 goto abort;
750 }
751 if (!sb_equal(refsb, sb)) {
752 printk(KERN_WARNING "md: %s has same UUID"
753 " but different superblock to %s\n",
754 b, bdevname(refdev->bdev, b2));
755 goto abort;
756 }
757 ev1 = md_event(sb);
758 ev2 = md_event(refsb);
759 if (ev1 > ev2)
760 ret = 1;
761 else
762 ret = 0;
763 }
764 rdev->size = calc_dev_size(rdev, sb->chunk_size);
765
2bf071bf
N		 766 if (rdev->size < sb->size && sb->level > 1)
767 /* "this cannot possibly happen" ... */
768 ret = -EINVAL;
769
1da177e4
LT		 770 abort:
771 return ret;
772}
773
774/*
775 * validate_super for 0.90.0
776 */
777static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
778{
779 mdp_disk_t *desc;
780 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
07d84d10 781 __u64 ev1 = md_event(sb);
1da177e4 782
41158c7e 783 rdev->raid_disk = -1;
b2d444d7 784 rdev->flags = 0;
1da177e4
LT		 785 if (mddev->raid_disks == 0) {
786 mddev->major_version = 0;
787 mddev->minor_version = sb->minor_version;
788 mddev->patch_version = sb->patch_version;
789 mddev->persistent = ! sb->not_persistent;
790 mddev->chunk_size = sb->chunk_size;
791 mddev->ctime = sb->ctime;
792 mddev->utime = sb->utime;
793 mddev->level = sb->level;
d9d166c2 794 mddev->clevel[0] = 0;
1da177e4
LT		 795 mddev->layout = sb->layout;
796 mddev->raid_disks = sb->raid_disks;
797 mddev->size = sb->size;
07d84d10 798 mddev->events = ev1;
9223214e 799 mddev->bitmap_offset = 0;
36fa3063 800 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
1da177e4 801
f6705578
N		 802 if (mddev->minor_version >= 91) {
803 mddev->reshape_position = sb->reshape_position;
804 mddev->delta_disks = sb->delta_disks;
805 mddev->new_level = sb->new_level;
806 mddev->new_layout = sb->new_layout;
807 mddev->new_chunk = sb->new_chunk;
808 } else {
809 mddev->reshape_position = MaxSector;
810 mddev->delta_disks = 0;
811 mddev->new_level = mddev->level;
812 mddev->new_layout = mddev->layout;
813 mddev->new_chunk = mddev->chunk_size;
814 }
815
1da177e4
LT		 816 if (sb->state & (1<<MD_SB_CLEAN))
817 mddev->recovery_cp = MaxSector;
818 else {
819 if (sb->events_hi == sb->cp_events_hi &&
820 sb->events_lo == sb->cp_events_lo) {
821 mddev->recovery_cp = sb->recovery_cp;
822 } else
823 mddev->recovery_cp = 0;
824 }
825
826 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
827 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
828 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
829 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
830
831 mddev->max_disks = MD_SB_DISKS;
a654b9d8
N		 832
833 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
e11e93fa 834 mddev->bitmap_file == NULL)
36fa3063 835 mddev->bitmap_offset = mddev->default_bitmap_offset;
a654b9d8 836
41158c7e
N		 837 } else if (mddev->pers == NULL) {
838 /* Insist on good event counter while assembling */
1da177e4
LT		 839 ++ev1;
840 if (ev1 < mddev->events)
841 return -EINVAL;
41158c7e
N		 842 } else if (mddev->bitmap) {
843 /* if adding to array with a bitmap, then we can accept an
844 * older device ... but not too old.
845 */
41158c7e
N		 846 if (ev1 < mddev->bitmap->events_cleared)
847 return 0;
07d84d10
N		 848 } else {
849 if (ev1 < mddev->events)
850 /* just a hot-add of a new device, leave raid_disk at -1 */
851 return 0;
852 }
41158c7e 853
1da177e4 854 if (mddev->level != LEVEL_MULTIPATH) {
1da177e4
LT		 855 desc = sb->disks + rdev->desc_nr;
856
857 if (desc->state & (1<<MD_DISK_FAULTY))
b2d444d7 858 set_bit(Faulty, &rdev->flags);
7c7546cc
N		 859 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
860 desc->raid_disk < mddev->raid_disks */) {
b2d444d7 861 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 862 rdev->raid_disk = desc->raid_disk;
863 }
8ddf9efe
N		 864 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
865 set_bit(WriteMostly, &rdev->flags);
41158c7e 866 } else /* MULTIPATH are always insync */
b2d444d7 867 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 868 return 0;
869}
870
871/*
872 * sync_super for 0.90.0
873 */
874static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
875{
876 mdp_super_t *sb;
877 struct list_head *tmp;
878 mdk_rdev_t *rdev2;
879 int next_spare = mddev->raid_disks;
19133a42 880
1da177e4
LT		 881
882 /* make rdev->sb match mddev data..
883 *
884 * 1/ zero out disks
885 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
886 * 3/ any empty disks < next_spare become removed
887 *
888 * disks[0] gets initialised to REMOVED because
889 * we cannot be sure from other fields if it has
890 * been initialised or not.
891 */
892 int i;
893 int active=0, working=0,failed=0,spare=0,nr_disks=0;
894
61181565
N		 895 rdev->sb_size = MD_SB_BYTES;
896
1da177e4
LT		 897 sb = (mdp_super_t*)page_address(rdev->sb_page);
898
899 memset(sb, 0, sizeof(*sb));
900
901 sb->md_magic = MD_SB_MAGIC;
902 sb->major_version = mddev->major_version;
1da177e4
LT		 903 sb->patch_version = mddev->patch_version;
904 sb->gvalid_words = 0; /* ignored */
905 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
906 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
907 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
908 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
909
910 sb->ctime = mddev->ctime;
911 sb->level = mddev->level;
912 sb->size = mddev->size;
913 sb->raid_disks = mddev->raid_disks;
914 sb->md_minor = mddev->md_minor;
915 sb->not_persistent = !mddev->persistent;
916 sb->utime = mddev->utime;
917 sb->state = 0;
918 sb->events_hi = (mddev->events>>32);
919 sb->events_lo = (u32)mddev->events;
920
f6705578
N		 921 if (mddev->reshape_position == MaxSector)
922 sb->minor_version = 90;
923 else {
924 sb->minor_version = 91;
925 sb->reshape_position = mddev->reshape_position;
926 sb->new_level = mddev->new_level;
927 sb->delta_disks = mddev->delta_disks;
928 sb->new_layout = mddev->new_layout;
929 sb->new_chunk = mddev->new_chunk;
930 }
931 mddev->minor_version = sb->minor_version;
1da177e4
LT		 932 if (mddev->in_sync)
933 {
934 sb->recovery_cp = mddev->recovery_cp;
935 sb->cp_events_hi = (mddev->events>>32);
936 sb->cp_events_lo = (u32)mddev->events;
937 if (mddev->recovery_cp == MaxSector)
938 sb->state = (1<< MD_SB_CLEAN);
939 } else
940 sb->recovery_cp = 0;
941
942 sb->layout = mddev->layout;
943 sb->chunk_size = mddev->chunk_size;
944
a654b9d8
N		 945 if (mddev->bitmap && mddev->bitmap_file == NULL)
946 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
947
1da177e4
LT		 948 sb->disks[0].state = (1<<MD_DISK_REMOVED);
949 ITERATE_RDEV(mddev,rdev2,tmp) {
950 mdp_disk_t *d;
86e6ffdd 951 int desc_nr;
b2d444d7
N		 952 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
953 && !test_bit(Faulty, &rdev2->flags))
86e6ffdd 954 desc_nr = rdev2->raid_disk;
1da177e4 955 else
86e6ffdd 956 desc_nr = next_spare++;
19133a42 957 rdev2->desc_nr = desc_nr;
1da177e4
LT		 958 d = &sb->disks[rdev2->desc_nr];
959 nr_disks++;
960 d->number = rdev2->desc_nr;
961 d->major = MAJOR(rdev2->bdev->bd_dev);
962 d->minor = MINOR(rdev2->bdev->bd_dev);
b2d444d7
N		 963 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
964 && !test_bit(Faulty, &rdev2->flags))
1da177e4
LT		 965 d->raid_disk = rdev2->raid_disk;
966 else
967 d->raid_disk = rdev2->desc_nr; /* compatibility */
1be7892f 968 if (test_bit(Faulty, &rdev2->flags))
1da177e4 969 d->state = (1<<MD_DISK_FAULTY);
1be7892f 970 else if (test_bit(In_sync, &rdev2->flags)) {
1da177e4
LT		 971 d->state = (1<<MD_DISK_ACTIVE);
972 d->state |= (1<<MD_DISK_SYNC);
973 active++;
974 working++;
975 } else {
976 d->state = 0;
977 spare++;
978 working++;
979 }
8ddf9efe
N		 980 if (test_bit(WriteMostly, &rdev2->flags))
981 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4 982 }
1da177e4
LT		 983 /* now set the "removed" and "faulty" bits on any missing devices */
984 for (i=0 ; i < mddev->raid_disks ; i++) {
985 mdp_disk_t *d = &sb->disks[i];
986 if (d->state == 0 && d->number == 0) {
987 d->number = i;
988 d->raid_disk = i;
989 d->state = (1<<MD_DISK_REMOVED);
990 d->state |= (1<<MD_DISK_FAULTY);
991 failed++;
992 }
993 }
994 sb->nr_disks = nr_disks;
995 sb->active_disks = active;
996 sb->working_disks = working;
997 sb->failed_disks = failed;
998 sb->spare_disks = spare;
999
1000 sb->this_disk = sb->disks[rdev->desc_nr];
1001 sb->sb_csum = calc_sb_csum(sb);
1002}
1003
1004/*
1005 * version 1 superblock
1006 */
1007
1c05b4bc 1008static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1da177e4 1009{
1c05b4bc
N		 1010 __le32 disk_csum;
1011 u32 csum;
1da177e4
LT		 1012 unsigned long long newcsum;
1013 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1c05b4bc 1014 __le32 *isuper = (__le32*)sb;
1da177e4
LT		 1015 int i;
1016
1017 disk_csum = sb->sb_csum;
1018 sb->sb_csum = 0;
1019 newcsum = 0;
1020 for (i=0; size>=4; size -= 4 )
1021 newcsum += le32_to_cpu(*isuper++);
1022
1023 if (size == 2)
1c05b4bc 1024 newcsum += le16_to_cpu(*(__le16*) isuper);
1da177e4
LT		 1025
1026 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1027 sb->sb_csum = disk_csum;
1028 return cpu_to_le32(csum);
1029}
1030
1031static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1032{
1033 struct mdp_superblock_1 *sb;
1034 int ret;
1035 sector_t sb_offset;
1036 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 1037 int bmask;
1da177e4
LT		 1038
1039 /*
1040 * Calculate the position of the superblock.
1041 * It is always aligned to a 4K boundary and
1042 * depeding on minor_version, it can be:
1043 * 0: At least 8K, but less than 12K, from end of device
1044 * 1: At start of device
1045 * 2: 4K from start of device.
1046 */
1047 switch(minor_version) {
1048 case 0:
1049 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1050 sb_offset -= 8*2;
39730960 1051 sb_offset &= ~(sector_t)(4*2-1);
1da177e4
LT		 1052 /* convert from sectors to K */
1053 sb_offset /= 2;
1054 break;
1055 case 1:
1056 sb_offset = 0;
1057 break;
1058 case 2:
1059 sb_offset = 4;
1060 break;
1061 default:
1062 return -EINVAL;
1063 }
1064 rdev->sb_offset = sb_offset;
1065
0002b271
N		 1066 /* superblock is rarely larger than 1K, but it can be larger,
1067 * and it is safe to read 4k, so we do that
1068 */
1069 ret = read_disk_sb(rdev, 4096);
1da177e4
LT		 1070 if (ret) return ret;
1071
1072
1073 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1074
1075 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1076 sb->major_version != cpu_to_le32(1) ||
1077 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1078 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
71c0805c 1079 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT		 1080 return -EINVAL;
1081
1082 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1083 printk("md: invalid superblock checksum on %s\n",
1084 bdevname(rdev->bdev,b));
1085 return -EINVAL;
1086 }
1087 if (le64_to_cpu(sb->data_size) < 10) {
1088 printk("md: data_size too small on %s\n",
1089 bdevname(rdev->bdev,b));
1090 return -EINVAL;
1091 }
e11e93fa
N		 1092 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1093 if (sb->level != cpu_to_le32(1) &&
1094 sb->level != cpu_to_le32(4) &&
1095 sb->level != cpu_to_le32(5) &&
1096 sb->level != cpu_to_le32(6) &&
1097 sb->level != cpu_to_le32(10)) {
1098 printk(KERN_WARNING
1099 "md: bitmaps not supported for this level.\n");
1100 return -EINVAL;
1101 }
1102 }
1103
1da177e4
LT		 1104 rdev->preferred_minor = 0xffff;
1105 rdev->data_offset = le64_to_cpu(sb->data_offset);
4dbcdc75 1106 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1da177e4 1107
0002b271 1108 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
720a3dc3 1109 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
0002b271
N		 1110 if (rdev->sb_size & bmask)
1111 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1112
31b65a0d
N		 1113 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1114 rdev->desc_nr = -1;
1115 else
1116 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1117
1da177e4 1118 if (refdev == 0)
8ed75463 1119 ret = 1;
1da177e4
LT		 1120 else {
1121 __u64 ev1, ev2;
1122 struct mdp_superblock_1 *refsb =
1123 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1124
1125 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1126 sb->level != refsb->level ||
1127 sb->layout != refsb->layout ||
1128 sb->chunksize != refsb->chunksize) {
1129 printk(KERN_WARNING "md: %s has strangely different"
1130 " superblock to %s\n",
1131 bdevname(rdev->bdev,b),
1132 bdevname(refdev->bdev,b2));
1133 return -EINVAL;
1134 }
1135 ev1 = le64_to_cpu(sb->events);
1136 ev2 = le64_to_cpu(refsb->events);
1137
1138 if (ev1 > ev2)
8ed75463
N		 1139 ret = 1;
1140 else
1141 ret = 0;
1da177e4
LT		 1142 }
1143 if (minor_version)
1144 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1145 else
1146 rdev->size = rdev->sb_offset;
1147 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1148 return -EINVAL;
1149 rdev->size = le64_to_cpu(sb->data_size)/2;
1150 if (le32_to_cpu(sb->chunksize))
1151 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
2bf071bf 1152
1c05b4bc 1153 if (le64_to_cpu(sb->size) > rdev->size*2)
2bf071bf 1154 return -EINVAL;
8ed75463 1155 return ret;
1da177e4
LT		 1156}
1157
1158static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1159{
1160 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
07d84d10 1161 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4 1162
41158c7e 1163 rdev->raid_disk = -1;
b2d444d7 1164 rdev->flags = 0;
1da177e4
LT		 1165 if (mddev->raid_disks == 0) {
1166 mddev->major_version = 1;
1167 mddev->patch_version = 0;
1168 mddev->persistent = 1;
1169 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1170 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1171 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1172 mddev->level = le32_to_cpu(sb->level);
d9d166c2 1173 mddev->clevel[0] = 0;
1da177e4
LT		 1174 mddev->layout = le32_to_cpu(sb->layout);
1175 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1176 mddev->size = le64_to_cpu(sb->size)/2;
07d84d10 1177 mddev->events = ev1;
9223214e 1178 mddev->bitmap_offset = 0;
29fc7e3e 1179 mddev->default_bitmap_offset = 1024 >> 9;
1da177e4
LT		 1180
1181 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1182 memcpy(mddev->uuid, sb->set_uuid, 16);
1183
1184 mddev->max_disks = (4096-256)/2;
a654b9d8 1185
71c0805c 1186 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
e11e93fa 1187 mddev->bitmap_file == NULL )
a654b9d8 1188 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
e11e93fa 1189
f6705578
N		 1190 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1191 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1192 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1193 mddev->new_level = le32_to_cpu(sb->new_level);
1194 mddev->new_layout = le32_to_cpu(sb->new_layout);
1195 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1196 } else {
1197 mddev->reshape_position = MaxSector;
1198 mddev->delta_disks = 0;
1199 mddev->new_level = mddev->level;
1200 mddev->new_layout = mddev->layout;
1201 mddev->new_chunk = mddev->chunk_size;
1202 }
1203
41158c7e
N		 1204 } else if (mddev->pers == NULL) {
1205 /* Insist of good event counter while assembling */
1da177e4
LT		 1206 ++ev1;
1207 if (ev1 < mddev->events)
1208 return -EINVAL;
41158c7e
N		 1209 } else if (mddev->bitmap) {
1210 /* If adding to array with a bitmap, then we can accept an
1211 * older device, but not too old.
1212 */
41158c7e
N		 1213 if (ev1 < mddev->bitmap->events_cleared)
1214 return 0;
07d84d10
N		 1215 } else {
1216 if (ev1 < mddev->events)
1217 /* just a hot-add of a new device, leave raid_disk at -1 */
1218 return 0;
1219 }
1da177e4
LT		 1220 if (mddev->level != LEVEL_MULTIPATH) {
1221 int role;
1da177e4
LT		 1222 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1223 switch(role) {
1224 case 0xffff: /* spare */
1da177e4
LT		 1225 break;
1226 case 0xfffe: /* faulty */
b2d444d7 1227 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 1228 break;
1229 default:
5fd6c1dc
N		 1230 if ((le32_to_cpu(sb->feature_map) &
1231 MD_FEATURE_RECOVERY_OFFSET))
1232 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1233 else
1234 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1235 rdev->raid_disk = role;
1236 break;
1237 }
8ddf9efe
N		 1238 if (sb->devflags & WriteMostly1)
1239 set_bit(WriteMostly, &rdev->flags);
41158c7e 1240 } else /* MULTIPATH are always insync */
b2d444d7 1241 set_bit(In_sync, &rdev->flags);
41158c7e 1242
1da177e4
LT		 1243 return 0;
1244}
1245
1246static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1247{
1248 struct mdp_superblock_1 *sb;
1249 struct list_head *tmp;
1250 mdk_rdev_t *rdev2;
1251 int max_dev, i;
1252 /* make rdev->sb match mddev and rdev data. */
1253
1254 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1255
1256 sb->feature_map = 0;
1257 sb->pad0 = 0;
5fd6c1dc 1258 sb->recovery_offset = cpu_to_le64(0);
1da177e4
LT		 1259 memset(sb->pad1, 0, sizeof(sb->pad1));
1260 memset(sb->pad2, 0, sizeof(sb->pad2));
1261 memset(sb->pad3, 0, sizeof(sb->pad3));
1262
1263 sb->utime = cpu_to_le64((__u64)mddev->utime);
1264 sb->events = cpu_to_le64(mddev->events);
1265 if (mddev->in_sync)
1266 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1267 else
1268 sb->resync_offset = cpu_to_le64(0);
1269
1c05b4bc 1270 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
4dbcdc75 1271
f0ca340c 1272 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
29fc7e3e 1273 sb->size = cpu_to_le64(mddev->size<<1);
f0ca340c 1274
a654b9d8
N		 1275 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1276 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
71c0805c 1277 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8 1278 }
5fd6c1dc
N		 1279
1280 if (rdev->raid_disk >= 0 &&
1281 !test_bit(In_sync, &rdev->flags) &&
1282 rdev->recovery_offset > 0) {
1283 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1284 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1285 }
1286
f6705578
N		 1287 if (mddev->reshape_position != MaxSector) {
1288 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1289 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1290 sb->new_layout = cpu_to_le32(mddev->new_layout);
1291 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1292 sb->new_level = cpu_to_le32(mddev->new_level);
1293 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1294 }
a654b9d8 1295
1da177e4
LT		 1296 max_dev = 0;
1297 ITERATE_RDEV(mddev,rdev2,tmp)
1298 if (rdev2->desc_nr+1 > max_dev)
1299 max_dev = rdev2->desc_nr+1;
1300
1301 sb->max_dev = cpu_to_le32(max_dev);
1302 for (i=0; i<max_dev;i++)
1303 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1304
1305 ITERATE_RDEV(mddev,rdev2,tmp) {
1306 i = rdev2->desc_nr;
b2d444d7 1307 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1308 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1309 else if (test_bit(In_sync, &rdev2->flags))
1da177e4 1310 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
5fd6c1dc
N		 1311 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1312 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1da177e4
LT		 1313 else
1314 sb->dev_roles[i] = cpu_to_le16(0xffff);
1315 }
1316
1da177e4
LT		 1317 sb->sb_csum = calc_sb_1_csum(sb);
1318}
1319
1320
75c96f85 1321static struct super_type super_types[] = {
1da177e4
LT		 1322 [0] = {
1323 .name = "0.90.0",
1324 .owner = THIS_MODULE,
1325 .load_super = super_90_load,
1326 .validate_super = super_90_validate,
1327 .sync_super = super_90_sync,
1328 },
1329 [1] = {
1330 .name = "md-1",
1331 .owner = THIS_MODULE,
1332 .load_super = super_1_load,
1333 .validate_super = super_1_validate,
1334 .sync_super = super_1_sync,
1335 },
1336};
1da177e4
LT		 1337
1338static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1339{
7dd5e7c3
N		 1340 struct list_head *tmp, *tmp2;
1341 mdk_rdev_t *rdev, *rdev2;
1da177e4
LT		 1342
1343 ITERATE_RDEV(mddev1,rdev,tmp)
7dd5e7c3
N		 1344 ITERATE_RDEV(mddev2, rdev2, tmp2)
1345 if (rdev->bdev->bd_contains ==
1346 rdev2->bdev->bd_contains)
1347 return 1;
1da177e4
LT		 1348
1349 return 0;
1350}
1351
1352static LIST_HEAD(pending_raid_disks);
1353
1354static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1355{
7dd5e7c3 1356 char b[BDEVNAME_SIZE];
f637b9f9 1357 struct kobject *ko;
1edf80d3 1358 char *s;
5e55e2f5 1359 int err;
1da177e4
LT		 1360
1361 if (rdev->mddev) {
1362 MD_BUG();
1363 return -EINVAL;
1364 }
2bf071bf
N		 1365 /* make sure rdev->size exceeds mddev->size */
1366 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1367 if (mddev->pers)
1368 /* Cannot change size, so fail */
1369 return -ENOSPC;
1370 else
1371 mddev->size = rdev->size;
1372 }
1da177e4
LT		 1373
1374 /* Verify rdev->desc_nr is unique.
1375 * If it is -1, assign a free number, else
1376 * check number is not in use
1377 */
1378 if (rdev->desc_nr < 0) {
1379 int choice = 0;
1380 if (mddev->pers) choice = mddev->raid_disks;
1381 while (find_rdev_nr(mddev, choice))
1382 choice++;
1383 rdev->desc_nr = choice;
1384 } else {
1385 if (find_rdev_nr(mddev, rdev->desc_nr))
1386 return -EBUSY;
1387 }
19133a42
N		 1388 bdevname(rdev->bdev,b);
1389 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1390 return -ENOMEM;
1edf80d3
NB		 1391 while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
1392 *s = '!';
1da177e4 1393
1da177e4 1394 rdev->mddev = mddev;
19133a42 1395 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 1396
9c791977 1397 rdev->kobj.parent = &mddev->kobj;
5e55e2f5
N		 1398 if ((err = kobject_add(&rdev->kobj)))
1399 goto fail;
86e6ffdd 1400
f637b9f9
N		 1401 if (rdev->bdev->bd_part)
1402 ko = &rdev->bdev->bd_part->kobj;
1403 else
1404 ko = &rdev->bdev->bd_disk->kobj;
5e55e2f5
N		 1405 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1406 kobject_del(&rdev->kobj);
1407 goto fail;
1408 }
1409 list_add(&rdev->same_set, &mddev->disks);
5463c790 1410 bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
1da177e4 1411 return 0;
5e55e2f5
N		 1412
1413 fail:
1414 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1415 b, mdname(mddev));
1416 return err;
1da177e4
LT		 1417}
1418
5792a285
N		 1419static void delayed_delete(struct work_struct *ws)
1420{
1421 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1422 kobject_del(&rdev->kobj);
1423}
1424
1da177e4
LT		 1425static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1426{
1427 char b[BDEVNAME_SIZE];
1428 if (!rdev->mddev) {
1429 MD_BUG();
1430 return;
1431 }
5463c790 1432 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1da177e4
LT		 1433 list_del_init(&rdev->same_set);
1434 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1435 rdev->mddev = NULL;
86e6ffdd 1436 sysfs_remove_link(&rdev->kobj, "block");
5792a285
N		 1437
1438 /* We need to delay this, otherwise we can deadlock when
1439 * writing to 'remove' to "dev/state"
1440 */
1441 INIT_WORK(&rdev->del_work, delayed_delete);
1442 schedule_work(&rdev->del_work);
1da177e4
LT		 1443}
1444
1445/*
1446 * prevent the device from being mounted, repartitioned or
1447 * otherwise reused by a RAID array (or any other kernel
1448 * subsystem), by bd_claiming the device.
1449 */
1450static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1451{
1452 int err = 0;
1453 struct block_device *bdev;
1454 char b[BDEVNAME_SIZE];
1455
2e7b651d 1456 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1da177e4
LT		 1457 if (IS_ERR(bdev)) {
1458 printk(KERN_ERR "md: could not open %s.\n",
1459 __bdevname(dev, b));
1460 return PTR_ERR(bdev);
1461 }
1462 err = bd_claim(bdev, rdev);
1463 if (err) {
1464 printk(KERN_ERR "md: could not bd_claim %s.\n",
1465 bdevname(bdev, b));
2e7b651d 1466 blkdev_put(bdev);
1da177e4
LT		 1467 return err;
1468 }
1469 rdev->bdev = bdev;
1470 return err;
1471}
1472
1473static void unlock_rdev(mdk_rdev_t *rdev)
1474{
1475 struct block_device *bdev = rdev->bdev;
1476 rdev->bdev = NULL;
1477 if (!bdev)
1478 MD_BUG();
1479 bd_release(bdev);
2e7b651d 1480 blkdev_put(bdev);
1da177e4
LT		 1481}
1482
1483void md_autodetect_dev(dev_t dev);
1484
1485static void export_rdev(mdk_rdev_t * rdev)
1486{
1487 char b[BDEVNAME_SIZE];
1488 printk(KERN_INFO "md: export_rdev(%s)\n",
1489 bdevname(rdev->bdev,b));
1490 if (rdev->mddev)
1491 MD_BUG();
1492 free_disk_sb(rdev);
1493 list_del_init(&rdev->same_set);
1494#ifndef MODULE
1495 md_autodetect_dev(rdev->bdev->bd_dev);
1496#endif
1497 unlock_rdev(rdev);
86e6ffdd 1498 kobject_put(&rdev->kobj);
1da177e4
LT		 1499}
1500
1501static void kick_rdev_from_array(mdk_rdev_t * rdev)
1502{
1503 unbind_rdev_from_array(rdev);
1504 export_rdev(rdev);
1505}
1506
1507static void export_array(mddev_t *mddev)
1508{
1509 struct list_head *tmp;
1510 mdk_rdev_t *rdev;
1511
1512 ITERATE_RDEV(mddev,rdev,tmp) {
1513 if (!rdev->mddev) {
1514 MD_BUG();
1515 continue;
1516 }
1517 kick_rdev_from_array(rdev);
1518 }
1519 if (!list_empty(&mddev->disks))
1520 MD_BUG();
1521 mddev->raid_disks = 0;
1522 mddev->major_version = 0;
1523}
1524
1525static void print_desc(mdp_disk_t *desc)
1526{
1527 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1528 desc->major,desc->minor,desc->raid_disk,desc->state);
1529}
1530
1531static void print_sb(mdp_super_t *sb)
1532{
1533 int i;
1534
1535 printk(KERN_INFO
1536 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1537 sb->major_version, sb->minor_version, sb->patch_version,
1538 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1539 sb->ctime);
1540 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1541 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1542 sb->md_minor, sb->layout, sb->chunk_size);
1543 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1544 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1545 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1546 sb->failed_disks, sb->spare_disks,
1547 sb->sb_csum, (unsigned long)sb->events_lo);
1548
1549 printk(KERN_INFO);
1550 for (i = 0; i < MD_SB_DISKS; i++) {
1551 mdp_disk_t *desc;
1552
1553 desc = sb->disks + i;
1554 if (desc->number || desc->major || desc->minor ||
1555 desc->raid_disk || (desc->state && (desc->state != 4))) {
1556 printk(" D %2d: ", i);
1557 print_desc(desc);
1558 }
1559 }
1560 printk(KERN_INFO "md: THIS: ");
1561 print_desc(&sb->this_disk);
1562
1563}
1564
1565static void print_rdev(mdk_rdev_t *rdev)
1566{
1567 char b[BDEVNAME_SIZE];
1568 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1569 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
b2d444d7
N		 1570 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1571 rdev->desc_nr);
1da177e4
LT		 1572 if (rdev->sb_loaded) {
1573 printk(KERN_INFO "md: rdev superblock:\n");
1574 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1575 } else
1576 printk(KERN_INFO "md: no rdev superblock!\n");
1577}
1578
5e56341d 1579static void md_print_devices(void)
1da177e4
LT		 1580{
1581 struct list_head *tmp, *tmp2;
1582 mdk_rdev_t *rdev;
1583 mddev_t *mddev;
1584 char b[BDEVNAME_SIZE];
1585
1586 printk("\n");
1587 printk("md: **********************************\n");
1588 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1589 printk("md: **********************************\n");
1590 ITERATE_MDDEV(mddev,tmp) {
1da177e4 1591
32a7627c
N		 1592 if (mddev->bitmap)
1593 bitmap_print_sb(mddev->bitmap);
1594 else
1595 printk("%s: ", mdname(mddev));
1da177e4
LT		 1596 ITERATE_RDEV(mddev,rdev,tmp2)
1597 printk("<%s>", bdevname(rdev->bdev,b));
1598 printk("\n");
1599
1600 ITERATE_RDEV(mddev,rdev,tmp2)
1601 print_rdev(rdev);
1602 }
1603 printk("md: **********************************\n");
1604 printk("\n");
1605}
1606
1607
42543769 1608static void sync_sbs(mddev_t * mddev, int nospares)
1da177e4 1609{
42543769
N		 1610 /* Update each superblock (in-memory image), but
1611 * if we are allowed to, skip spares which already
1612 * have the right event counter, or have one earlier
1613 * (which would mean they aren't being marked as dirty
1614 * with the rest of the array)
1615 */
1da177e4
LT		 1616 mdk_rdev_t *rdev;
1617 struct list_head *tmp;
1618
1619 ITERATE_RDEV(mddev,rdev,tmp) {
42543769
N		 1620 if (rdev->sb_events == mddev->events ||
1621 (nospares &&
1622 rdev->raid_disk < 0 &&
1623 (rdev->sb_events&1)==0 &&
1624 rdev->sb_events+1 == mddev->events)) {
1625 /* Don't update this superblock */
1626 rdev->sb_loaded = 2;
1627 } else {
1628 super_types[mddev->major_version].
1629 sync_super(mddev, rdev);
1630 rdev->sb_loaded = 1;
1631 }
1da177e4
LT		 1632 }
1633}
1634
850b2b42 1635static void md_update_sb(mddev_t * mddev, int force_change)
1da177e4 1636{
7bfa19f2 1637 int err;
1da177e4
LT		 1638 struct list_head *tmp;
1639 mdk_rdev_t *rdev;
06d91a5f 1640 int sync_req;
42543769 1641 int nospares = 0;
1da177e4 1642
1da177e4 1643repeat:
a9701a30 1644 spin_lock_irq(&mddev->write_lock);
84692195 1645
850b2b42
N		 1646 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1647 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1648 force_change = 1;
1649 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1650 /* just a clean<-> dirty transition, possibly leave spares alone,
1651 * though if events isn't the right even/odd, we will have to do
1652 * spares after all
1653 */
1654 nospares = 1;
1655 if (force_change)
1656 nospares = 0;
1657 if (mddev->degraded)
84692195
N		 1658 /* If the array is degraded, then skipping spares is both
1659 * dangerous and fairly pointless.
1660 * Dangerous because a device that was removed from the array
1661 * might have a event_count that still looks up-to-date,
1662 * so it can be re-added without a resync.
1663 * Pointless because if there are any spares to skip,
1664 * then a recovery will happen and soon that array won't
1665 * be degraded any more and the spare can go back to sleep then.
1666 */
850b2b42 1667 nospares = 0;
84692195 1668
06d91a5f 1669 sync_req = mddev->in_sync;
1da177e4 1670 mddev->utime = get_seconds();
42543769
N		 1671
1672 /* If this is just a dirty<->clean transition, and the array is clean
1673 * and 'events' is odd, we can roll back to the previous clean state */
850b2b42 1674 if (nospares
42543769 1675 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1031be7a
N		 1676 && (mddev->events & 1)
1677 && mddev->events != 1)
42543769
N		 1678 mddev->events--;
1679 else {
1680 /* otherwise we have to go forward and ... */
1681 mddev->events ++;
1682 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1683 /* .. if the array isn't clean, insist on an odd 'events' */
1684 if ((mddev->events&1)==0) {
1685 mddev->events++;
1686 nospares = 0;
1687 }
1688 } else {
1689 /* otherwise insist on an even 'events' (for clean states) */
1690 if ((mddev->events&1)) {
1691 mddev->events++;
1692 nospares = 0;
1693 }
1694 }
1695 }
1da177e4
LT		 1696
1697 if (!mddev->events) {
1698 /*
1699 * oops, this 64-bit counter should never wrap.
1700 * Either we are in around ~1 trillion A.C., assuming
1701 * 1 reboot per second, or we have a bug:
1702 */
1703 MD_BUG();
1704 mddev->events --;
1705 }
42543769 1706 sync_sbs(mddev, nospares);
1da177e4
LT		 1707
1708 /*
1709 * do not write anything to disk if using
1710 * nonpersistent superblocks
1711 */
06d91a5f 1712 if (!mddev->persistent) {
850b2b42 1713 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
a9701a30 1714 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1715 wake_up(&mddev->sb_wait);
1da177e4 1716 return;
06d91a5f 1717 }
a9701a30 1718 spin_unlock_irq(&mddev->write_lock);
1da177e4
LT		 1719
1720 dprintk(KERN_INFO
1721 "md: updating %s RAID superblock on device (in sync %d)\n",
1722 mdname(mddev),mddev->in_sync);
1723
32a7627c 1724 err = bitmap_update_sb(mddev->bitmap);
1da177e4
LT		 1725 ITERATE_RDEV(mddev,rdev,tmp) {
1726 char b[BDEVNAME_SIZE];
1727 dprintk(KERN_INFO "md: ");
42543769
N		 1728 if (rdev->sb_loaded != 1)
1729 continue; /* no noise on spare devices */
b2d444d7 1730 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1731 dprintk("(skipping faulty ");
1732
1733 dprintk("%s ", bdevname(rdev->bdev,b));
b2d444d7 1734 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 1735 md_super_write(mddev,rdev,
0002b271 1736 rdev->sb_offset<<1, rdev->sb_size,
7bfa19f2
N		 1737 rdev->sb_page);
1738 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1739 bdevname(rdev->bdev,b),
1740 (unsigned long long)rdev->sb_offset);
42543769 1741 rdev->sb_events = mddev->events;
7bfa19f2 1742
1da177e4
LT		 1743 } else
1744 dprintk(")\n");
7bfa19f2 1745 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT		 1746 /* only need to write one superblock... */
1747 break;
1748 }
a9701a30 1749 md_super_wait(mddev);
850b2b42 1750 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
7bfa19f2 1751
a9701a30 1752 spin_lock_irq(&mddev->write_lock);
850b2b42
N		 1753 if (mddev->in_sync != sync_req ||
1754 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
06d91a5f 1755 /* have to write it out again */
a9701a30 1756 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N		 1757 goto repeat;
1758 }
850b2b42 1759 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
a9701a30 1760 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1761 wake_up(&mddev->sb_wait);
06d91a5f 1762
1da177e4
LT		 1763}
1764
bce74dac
N		 1765/* words written to sysfs files may, or my not, be \n terminated.
1766 * We want to accept with case. For this we use cmd_match.
1767 */
1768static int cmd_match(const char *cmd, const char *str)
1769{
1770 /* See if cmd, written into a sysfs file, matches
1771 * str. They must either be the same, or cmd can
1772 * have a trailing newline
1773 */
1774 while (*cmd && *str && *cmd == *str) {
1775 cmd++;
1776 str++;
1777 }
1778 if (*cmd == '\n')
1779 cmd++;
1780 if (*str || *cmd)
1781 return 0;
1782 return 1;
1783}
1784
86e6ffdd
N		 1785struct rdev_sysfs_entry {
1786 struct attribute attr;
1787 ssize_t (*show)(mdk_rdev_t *, char *);
1788 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1789};
1790
1791static ssize_t
96de1e66 1792state_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1793{
1794 char *sep = "";
1795 int len=0;
1796
b2d444d7 1797 if (test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 1798 len+= sprintf(page+len, "%sfaulty",sep);
1799 sep = ",";
1800 }
b2d444d7 1801 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1802 len += sprintf(page+len, "%sin_sync",sep);
1803 sep = ",";
1804 }
f655675b
N		 1805 if (test_bit(WriteMostly, &rdev->flags)) {
1806 len += sprintf(page+len, "%swrite_mostly",sep);
1807 sep = ",";
1808 }
b2d444d7
N		 1809 if (!test_bit(Faulty, &rdev->flags) &&
1810 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1811 len += sprintf(page+len, "%sspare", sep);
1812 sep = ",";
1813 }
1814 return len+sprintf(page+len, "\n");
1815}
1816
45dc2de1
N		 1817static ssize_t
1818state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1819{
1820 /* can write
1821 * faulty - simulates and error
1822 * remove - disconnects the device
f655675b
N		 1823 * writemostly - sets write_mostly
1824 * -writemostly - clears write_mostly
45dc2de1
N		 1825 */
1826 int err = -EINVAL;
1827 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1828 md_error(rdev->mddev, rdev);
1829 err = 0;
1830 } else if (cmd_match(buf, "remove")) {
1831 if (rdev->raid_disk >= 0)
1832 err = -EBUSY;
1833 else {
1834 mddev_t *mddev = rdev->mddev;
1835 kick_rdev_from_array(rdev);
3f9d7b0d
N		 1836 if (mddev->pers)
1837 md_update_sb(mddev, 1);
45dc2de1
N		 1838 md_new_event(mddev);
1839 err = 0;
1840 }
f655675b
N		 1841 } else if (cmd_match(buf, "writemostly")) {
1842 set_bit(WriteMostly, &rdev->flags);
1843 err = 0;
1844 } else if (cmd_match(buf, "-writemostly")) {
1845 clear_bit(WriteMostly, &rdev->flags);
1846 err = 0;
45dc2de1
N		 1847 }
1848 return err ? err : len;
1849}
80ca3a44
N		 1850static struct rdev_sysfs_entry rdev_state =
1851__ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
86e6ffdd
N		 1852
1853static ssize_t
96de1e66 1854super_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1855{
1856 if (rdev->sb_loaded && rdev->sb_size) {
1857 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1858 return rdev->sb_size;
1859 } else
1860 return 0;
1861}
96de1e66
N		 1862static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1863
4dbcdc75
N		 1864static ssize_t
1865errors_show(mdk_rdev_t *rdev, char *page)
1866{
1867 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1868}
1869
1870static ssize_t
1871errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1872{
1873 char *e;
1874 unsigned long n = simple_strtoul(buf, &e, 10);
1875 if (*buf && (*e == 0 || *e == '\n')) {
1876 atomic_set(&rdev->corrected_errors, n);
1877 return len;
1878 }
1879 return -EINVAL;
1880}
1881static struct rdev_sysfs_entry rdev_errors =
80ca3a44 1882__ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
4dbcdc75 1883
014236d2
N		 1884static ssize_t
1885slot_show(mdk_rdev_t *rdev, char *page)
1886{
1887 if (rdev->raid_disk < 0)
1888 return sprintf(page, "none\n");
1889 else
1890 return sprintf(page, "%d\n", rdev->raid_disk);
1891}
1892
1893static ssize_t
1894slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1895{
1896 char *e;
1897 int slot = simple_strtoul(buf, &e, 10);
1898 if (strncmp(buf, "none", 4)==0)
1899 slot = -1;
1900 else if (e==buf || (*e && *e!= '\n'))
1901 return -EINVAL;
1902 if (rdev->mddev->pers)
1903 /* Cannot set slot in active array (yet) */
1904 return -EBUSY;
1905 if (slot >= rdev->mddev->raid_disks)
1906 return -ENOSPC;
1907 rdev->raid_disk = slot;
1908 /* assume it is working */
1909 rdev->flags = 0;
1910 set_bit(In_sync, &rdev->flags);
1911 return len;
1912}
1913
1914
1915static struct rdev_sysfs_entry rdev_slot =
80ca3a44 1916__ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
014236d2 1917
93c8cad0
N		 1918static ssize_t
1919offset_show(mdk_rdev_t *rdev, char *page)
1920{
6961ece4 1921 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
93c8cad0
N		 1922}
1923
1924static ssize_t
1925offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1926{
1927 char *e;
1928 unsigned long long offset = simple_strtoull(buf, &e, 10);
1929 if (e==buf || (*e && *e != '\n'))
1930 return -EINVAL;
1931 if (rdev->mddev->pers)
1932 return -EBUSY;
1933 rdev->data_offset = offset;
1934 return len;
1935}
1936
1937static struct rdev_sysfs_entry rdev_offset =
80ca3a44 1938__ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
93c8cad0 1939
83303b61
N		 1940static ssize_t
1941rdev_size_show(mdk_rdev_t *rdev, char *page)
1942{
1943 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1944}
1945
1946static ssize_t
1947rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1948{
1949 char *e;
1950 unsigned long long size = simple_strtoull(buf, &e, 10);
1951 if (e==buf || (*e && *e != '\n'))
1952 return -EINVAL;
1953 if (rdev->mddev->pers)
1954 return -EBUSY;
1955 rdev->size = size;
1956 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1957 rdev->mddev->size = size;
1958 return len;
1959}
1960
1961static struct rdev_sysfs_entry rdev_size =
80ca3a44 1962__ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
83303b61 1963
86e6ffdd
N		 1964static struct attribute *rdev_default_attrs[] = {
1965 &rdev_state.attr,
1966 &rdev_super.attr,
4dbcdc75 1967 &rdev_errors.attr,
014236d2 1968 &rdev_slot.attr,
93c8cad0 1969 &rdev_offset.attr,
83303b61 1970 &rdev_size.attr,
86e6ffdd
N		 1971 NULL,
1972};
1973static ssize_t
1974rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1975{
1976 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1977 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1978
1979 if (!entry->show)
1980 return -EIO;
1981 return entry->show(rdev, page);
1982}
1983
1984static ssize_t
1985rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1986 const char *page, size_t length)
1987{
1988 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1989 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1990
1991 if (!entry->store)
1992 return -EIO;
67463acb
N		 1993 if (!capable(CAP_SYS_ADMIN))
1994 return -EACCES;
86e6ffdd
N		 1995 return entry->store(rdev, page, length);
1996}
1997
1998static void rdev_free(struct kobject *ko)
1999{
2000 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2001 kfree(rdev);
2002}
2003static struct sysfs_ops rdev_sysfs_ops = {
2004 .show = rdev_attr_show,
2005 .store = rdev_attr_store,
2006};
2007static struct kobj_type rdev_ktype = {
2008 .release = rdev_free,
2009 .sysfs_ops = &rdev_sysfs_ops,
2010 .default_attrs = rdev_default_attrs,
2011};
2012
1da177e4
LT		 2013/*
2014 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2015 *
2016 * mark the device faulty if:
2017 *
2018 * - the device is nonexistent (zero size)
2019 * - the device has no valid superblock
2020 *
2021 * a faulty rdev _never_ has rdev->sb set.
2022 */
2023static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2024{
2025 char b[BDEVNAME_SIZE];
2026 int err;
2027 mdk_rdev_t *rdev;
2028 sector_t size;
2029
9ffae0cf 2030 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1da177e4
LT		 2031 if (!rdev) {
2032 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2033 return ERR_PTR(-ENOMEM);
2034 }
1da177e4
LT		 2035
2036 if ((err = alloc_disk_sb(rdev)))
2037 goto abort_free;
2038
2039 err = lock_rdev(rdev, newdev);
2040 if (err)
2041 goto abort_free;
2042
86e6ffdd
N		 2043 rdev->kobj.parent = NULL;
2044 rdev->kobj.ktype = &rdev_ktype;
2045 kobject_init(&rdev->kobj);
2046
1da177e4 2047 rdev->desc_nr = -1;
2b6e8459 2048 rdev->saved_raid_disk = -1;
3f9d7b0d 2049 rdev->raid_disk = -1;
b2d444d7 2050 rdev->flags = 0;
1da177e4 2051 rdev->data_offset = 0;
42543769 2052 rdev->sb_events = 0;
1da177e4 2053 atomic_set(&rdev->nr_pending, 0);
ba22dcbf 2054 atomic_set(&rdev->read_errors, 0);
4dbcdc75 2055 atomic_set(&rdev->corrected_errors, 0);
1da177e4
LT		 2056
2057 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2058 if (!size) {
2059 printk(KERN_WARNING
2060 "md: %s has zero or unknown size, marking faulty!\n",
2061 bdevname(rdev->bdev,b));
2062 err = -EINVAL;
2063 goto abort_free;
2064 }
2065
2066 if (super_format >= 0) {
2067 err = super_types[super_format].
2068 load_super(rdev, NULL, super_minor);
2069 if (err == -EINVAL) {
2070 printk(KERN_WARNING
2071 "md: %s has invalid sb, not importing!\n",
2072 bdevname(rdev->bdev,b));
2073 goto abort_free;
2074 }
2075 if (err < 0) {
2076 printk(KERN_WARNING
2077 "md: could not read %s's sb, not importing!\n",
2078 bdevname(rdev->bdev,b));
2079 goto abort_free;
2080 }
2081 }
2082 INIT_LIST_HEAD(&rdev->same_set);
2083
2084 return rdev;
2085
2086abort_free:
2087 if (rdev->sb_page) {
2088 if (rdev->bdev)
2089 unlock_rdev(rdev);
2090 free_disk_sb(rdev);
2091 }
2092 kfree(rdev);
2093 return ERR_PTR(err);
2094}
2095
2096/*
2097 * Check a full RAID array for plausibility
2098 */
2099
2100
a757e64c 2101static void analyze_sbs(mddev_t * mddev)
1da177e4
LT		 2102{
2103 int i;
2104 struct list_head *tmp;
2105 mdk_rdev_t *rdev, *freshest;
2106 char b[BDEVNAME_SIZE];
2107
2108 freshest = NULL;
2109 ITERATE_RDEV(mddev,rdev,tmp)
2110 switch (super_types[mddev->major_version].
2111 load_super(rdev, freshest, mddev->minor_version)) {
2112 case 1:
2113 freshest = rdev;
2114 break;
2115 case 0:
2116 break;
2117 default:
2118 printk( KERN_ERR \
2119 "md: fatal superblock inconsistency in %s"
2120 " -- removing from array\n",
2121 bdevname(rdev->bdev,b));
2122 kick_rdev_from_array(rdev);
2123 }
2124
2125
2126 super_types[mddev->major_version].
2127 validate_super(mddev, freshest);
2128
2129 i = 0;
2130 ITERATE_RDEV(mddev,rdev,tmp) {
2131 if (rdev != freshest)
2132 if (super_types[mddev->major_version].
2133 validate_super(mddev, rdev)) {
2134 printk(KERN_WARNING "md: kicking non-fresh %s"
2135 " from array!\n",
2136 bdevname(rdev->bdev,b));
2137 kick_rdev_from_array(rdev);
2138 continue;
2139 }
2140 if (mddev->level == LEVEL_MULTIPATH) {
2141 rdev->desc_nr = i++;
2142 rdev->raid_disk = rdev->desc_nr;
b2d444d7 2143 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 2144 }
2145 }
2146
2147
2148
2149 if (mddev->recovery_cp != MaxSector &&
2150 mddev->level >= 1)
2151 printk(KERN_ERR "md: %s: raid array is not clean"
2152 " -- starting background reconstruction\n",
2153 mdname(mddev));
2154
1da177e4
LT		 2155}
2156
16f17b39
N		 2157static ssize_t
2158safe_delay_show(mddev_t *mddev, char *page)
2159{
2160 int msec = (mddev->safemode_delay*1000)/HZ;
2161 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2162}
2163static ssize_t
2164safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2165{
2166 int scale=1;
2167 int dot=0;
2168 int i;
2169 unsigned long msec;
2170 char buf[30];
2171 char *e;
2172 /* remove a period, and count digits after it */
2173 if (len >= sizeof(buf))
2174 return -EINVAL;
2175 strlcpy(buf, cbuf, len);
2176 buf[len] = 0;
2177 for (i=0; i<len; i++) {
2178 if (dot) {
2179 if (isdigit(buf[i])) {
2180 buf[i-1] = buf[i];
2181 scale *= 10;
2182 }
2183 buf[i] = 0;
2184 } else if (buf[i] == '.') {
2185 dot=1;
2186 buf[i] = 0;
2187 }
2188 }
2189 msec = simple_strtoul(buf, &e, 10);
2190 if (e == buf || (*e && *e != '\n'))
2191 return -EINVAL;
2192 msec = (msec * 1000) / scale;
2193 if (msec == 0)
2194 mddev->safemode_delay = 0;
2195 else {
2196 mddev->safemode_delay = (msec*HZ)/1000;
2197 if (mddev->safemode_delay == 0)
2198 mddev->safemode_delay = 1;
2199 }
2200 return len;
2201}
2202static struct md_sysfs_entry md_safe_delay =
80ca3a44 2203__ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
16f17b39 2204
eae1701f 2205static ssize_t
96de1e66 2206level_show(mddev_t *mddev, char *page)
eae1701f 2207{
2604b703 2208 struct mdk_personality *p = mddev->pers;
d9d166c2 2209 if (p)
eae1701f 2210 return sprintf(page, "%s\n", p->name);
d9d166c2
N		 2211 else if (mddev->clevel[0])
2212 return sprintf(page, "%s\n", mddev->clevel);
2213 else if (mddev->level != LEVEL_NONE)
2214 return sprintf(page, "%d\n", mddev->level);
2215 else
2216 return 0;
eae1701f
N		 2217}
2218
d9d166c2
N		 2219static ssize_t
2220level_store(mddev_t *mddev, const char *buf, size_t len)
2221{
2222 int rv = len;
2223 if (mddev->pers)
2224 return -EBUSY;
2225 if (len == 0)
2226 return 0;
2227 if (len >= sizeof(mddev->clevel))
2228 return -ENOSPC;
2229 strncpy(mddev->clevel, buf, len);
2230 if (mddev->clevel[len-1] == '\n')
2231 len--;
2232 mddev->clevel[len] = 0;
2233 mddev->level = LEVEL_NONE;
2234 return rv;
2235}
2236
2237static struct md_sysfs_entry md_level =
80ca3a44 2238__ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
eae1701f 2239
d4dbd025
N		 2240
2241static ssize_t
2242layout_show(mddev_t *mddev, char *page)
2243{
2244 /* just a number, not meaningful for all levels */
2245 return sprintf(page, "%d\n", mddev->layout);
2246}
2247
2248static ssize_t
2249layout_store(mddev_t *mddev, const char *buf, size_t len)
2250{
2251 char *e;
2252 unsigned long n = simple_strtoul(buf, &e, 10);
2253 if (mddev->pers)
2254 return -EBUSY;
2255
2256 if (!*buf || (*e && *e != '\n'))
2257 return -EINVAL;
2258
2259 mddev->layout = n;
2260 return len;
2261}
2262static struct md_sysfs_entry md_layout =
80ca3a44 2263__ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
d4dbd025
N		 2264
2265
eae1701f 2266static ssize_t
96de1e66 2267raid_disks_show(mddev_t *mddev, char *page)
eae1701f 2268{
bb636547
N		 2269 if (mddev->raid_disks == 0)
2270 return 0;
eae1701f
N		 2271 return sprintf(page, "%d\n", mddev->raid_disks);
2272}
2273
da943b99
N		 2274static int update_raid_disks(mddev_t *mddev, int raid_disks);
2275
2276static ssize_t
2277raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2278{
da943b99
N		 2279 char *e;
2280 int rv = 0;
2281 unsigned long n = simple_strtoul(buf, &e, 10);
2282
2283 if (!*buf || (*e && *e != '\n'))
2284 return -EINVAL;
2285
2286 if (mddev->pers)
2287 rv = update_raid_disks(mddev, n);
2288 else
2289 mddev->raid_disks = n;
2290 return rv ? rv : len;
2291}
2292static struct md_sysfs_entry md_raid_disks =
80ca3a44 2293__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
eae1701f 2294
3b34380a
N		 2295static ssize_t
2296chunk_size_show(mddev_t *mddev, char *page)
2297{
2298 return sprintf(page, "%d\n", mddev->chunk_size);
2299}
2300
2301static ssize_t
2302chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2303{
2304 /* can only set chunk_size if array is not yet active */
2305 char *e;
2306 unsigned long n = simple_strtoul(buf, &e, 10);
2307
2308 if (mddev->pers)
2309 return -EBUSY;
2310 if (!*buf || (*e && *e != '\n'))
2311 return -EINVAL;
2312
2313 mddev->chunk_size = n;
2314 return len;
2315}
2316static struct md_sysfs_entry md_chunk_size =
80ca3a44 2317__ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3b34380a 2318
a94213b1
N		 2319static ssize_t
2320resync_start_show(mddev_t *mddev, char *page)
2321{
2322 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2323}
2324
2325static ssize_t
2326resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2327{
2328 /* can only set chunk_size if array is not yet active */
2329 char *e;
2330 unsigned long long n = simple_strtoull(buf, &e, 10);
2331
2332 if (mddev->pers)
2333 return -EBUSY;
2334 if (!*buf || (*e && *e != '\n'))
2335 return -EINVAL;
2336
2337 mddev->recovery_cp = n;
2338 return len;
2339}
2340static struct md_sysfs_entry md_resync_start =
80ca3a44 2341__ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
a94213b1 2342
9e653b63
N		 2343/*
2344 * The array state can be:
2345 *
2346 * clear
2347 * No devices, no size, no level
2348 * Equivalent to STOP_ARRAY ioctl
2349 * inactive
2350 * May have some settings, but array is not active
2351 * all IO results in error
2352 * When written, doesn't tear down array, but just stops it
2353 * suspended (not supported yet)
2354 * All IO requests will block. The array can be reconfigured.
2355 * Writing this, if accepted, will block until array is quiessent
2356 * readonly
2357 * no resync can happen. no superblocks get written.
2358 * write requests fail
2359 * read-auto
2360 * like readonly, but behaves like 'clean' on a write request.
2361 *
2362 * clean - no pending writes, but otherwise active.
2363 * When written to inactive array, starts without resync
2364 * If a write request arrives then
2365 * if metadata is known, mark 'dirty' and switch to 'active'.
2366 * if not known, block and switch to write-pending
2367 * If written to an active array that has pending writes, then fails.
2368 * active
2369 * fully active: IO and resync can be happening.
2370 * When written to inactive array, starts with resync
2371 *
2372 * write-pending
2373 * clean, but writes are blocked waiting for 'active' to be written.
2374 *
2375 * active-idle
2376 * like active, but no writes have been seen for a while (100msec).
2377 *
2378 */
2379enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2380 write_pending, active_idle, bad_word};
05381954 2381static char *array_states[] = {
9e653b63
N		 2382 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2383 "write-pending", "active-idle", NULL };
2384
2385static int match_word(const char *word, char **list)
2386{
2387 int n;
2388 for (n=0; list[n]; n++)
2389 if (cmd_match(word, list[n]))
2390 break;
2391 return n;
2392}
2393
2394static ssize_t
2395array_state_show(mddev_t *mddev, char *page)
2396{
2397 enum array_state st = inactive;
2398
2399 if (mddev->pers)
2400 switch(mddev->ro) {
2401 case 1:
2402 st = readonly;
2403 break;
2404 case 2:
2405 st = read_auto;
2406 break;
2407 case 0:
2408 if (mddev->in_sync)
2409 st = clean;
2410 else if (mddev->safemode)
2411 st = active_idle;
2412 else
2413 st = active;
2414 }
2415 else {
2416 if (list_empty(&mddev->disks) &&
2417 mddev->raid_disks == 0 &&
2418 mddev->size == 0)
2419 st = clear;
2420 else
2421 st = inactive;
2422 }
2423 return sprintf(page, "%s\n", array_states[st]);
2424}
2425
2426static int do_md_stop(mddev_t * mddev, int ro);
2427static int do_md_run(mddev_t * mddev);
2428static int restart_array(mddev_t *mddev);
2429
2430static ssize_t
2431array_state_store(mddev_t *mddev, const char *buf, size_t len)
2432{
2433 int err = -EINVAL;
2434 enum array_state st = match_word(buf, array_states);
2435 switch(st) {
2436 case bad_word:
2437 break;
2438 case clear:
2439 /* stopping an active array */
2440 if (mddev->pers) {
2441 if (atomic_read(&mddev->active) > 1)
2442 return -EBUSY;
2443 err = do_md_stop(mddev, 0);
2444 }
2445 break;
2446 case inactive:
2447 /* stopping an active array */
2448 if (mddev->pers) {
2449 if (atomic_read(&mddev->active) > 1)
2450 return -EBUSY;
2451 err = do_md_stop(mddev, 2);
2452 }
2453 break;
2454 case suspended:
2455 break; /* not supported yet */
2456 case readonly:
2457 if (mddev->pers)
2458 err = do_md_stop(mddev, 1);
2459 else {
2460 mddev->ro = 1;
2461 err = do_md_run(mddev);
2462 }
2463 break;
2464 case read_auto:
2465 /* stopping an active array */
2466 if (mddev->pers) {
2467 err = do_md_stop(mddev, 1);
2468 if (err == 0)
2469 mddev->ro = 2; /* FIXME mark devices writable */
2470 } else {
2471 mddev->ro = 2;
2472 err = do_md_run(mddev);
2473 }
2474 break;
2475 case clean:
2476 if (mddev->pers) {
2477 restart_array(mddev);
2478 spin_lock_irq(&mddev->write_lock);
2479 if (atomic_read(&mddev->writes_pending) == 0) {
2480 mddev->in_sync = 1;
850b2b42 2481 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
9e653b63
N		 2482 }
2483 spin_unlock_irq(&mddev->write_lock);
2484 } else {
2485 mddev->ro = 0;
2486 mddev->recovery_cp = MaxSector;
2487 err = do_md_run(mddev);
2488 }
2489 break;
2490 case active:
2491 if (mddev->pers) {
2492 restart_array(mddev);
850b2b42 2493 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
9e653b63
N		 2494 wake_up(&mddev->sb_wait);
2495 err = 0;
2496 } else {
2497 mddev->ro = 0;
2498 err = do_md_run(mddev);
2499 }
2500 break;
2501 case write_pending:
2502 case active_idle:
2503 /* these cannot be set */
2504 break;
2505 }
2506 if (err)
2507 return err;
2508 else
2509 return len;
2510}
80ca3a44
N		 2511static struct md_sysfs_entry md_array_state =
2512__ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
9e653b63 2513
6d7ff738
N		 2514static ssize_t
2515null_show(mddev_t *mddev, char *page)
2516{
2517 return -EINVAL;
2518}
2519
2520static ssize_t
2521new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2522{
2523 /* buf must be %d:%d\n? giving major and minor numbers */
2524 /* The new device is added to the array.
2525 * If the array has a persistent superblock, we read the
2526 * superblock to initialise info and check validity.
2527 * Otherwise, only checking done is that in bind_rdev_to_array,
2528 * which mainly checks size.
2529 */
2530 char *e;
2531 int major = simple_strtoul(buf, &e, 10);
2532 int minor;
2533 dev_t dev;
2534 mdk_rdev_t *rdev;
2535 int err;
2536
2537 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2538 return -EINVAL;
2539 minor = simple_strtoul(e+1, &e, 10);
2540 if (*e && *e != '\n')
2541 return -EINVAL;
2542 dev = MKDEV(major, minor);
2543 if (major != MAJOR(dev) ||
2544 minor != MINOR(dev))
2545 return -EOVERFLOW;
2546
2547
2548 if (mddev->persistent) {
2549 rdev = md_import_device(dev, mddev->major_version,
2550 mddev->minor_version);
2551 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2552 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2553 mdk_rdev_t, same_set);
2554 err = super_types[mddev->major_version]
2555 .load_super(rdev, rdev0, mddev->minor_version);
2556 if (err < 0)
2557 goto out;
2558 }
2559 } else
2560 rdev = md_import_device(dev, -1, -1);
2561
2562 if (IS_ERR(rdev))
2563 return PTR_ERR(rdev);
2564 err = bind_rdev_to_array(rdev, mddev);
2565 out:
2566 if (err)
2567 export_rdev(rdev);
2568 return err ? err : len;
2569}
2570
2571static struct md_sysfs_entry md_new_device =
80ca3a44 2572__ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3b34380a 2573
9b1d1dac
PC		 2574static ssize_t
2575bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2576{
2577 char *end;
2578 unsigned long chunk, end_chunk;
2579
2580 if (!mddev->bitmap)
2581 goto out;
2582 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2583 while (*buf) {
2584 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2585 if (buf == end) break;
2586 if (*end == '-') { /* range */
2587 buf = end + 1;
2588 end_chunk = simple_strtoul(buf, &end, 0);
2589 if (buf == end) break;
2590 }
2591 if (*end && !isspace(*end)) break;
2592 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2593 buf = end;
2594 while (isspace(*buf)) buf++;
2595 }
2596 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2597out:
2598 return len;
2599}
2600
2601static struct md_sysfs_entry md_bitmap =
2602__ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2603
a35b0d69
N		 2604static ssize_t
2605size_show(mddev_t *mddev, char *page)
2606{
2607 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2608}
2609
2610static int update_size(mddev_t *mddev, unsigned long size);
2611
2612static ssize_t
2613size_store(mddev_t *mddev, const char *buf, size_t len)
2614{
2615 /* If array is inactive, we can reduce the component size, but
2616 * not increase it (except from 0).
2617 * If array is active, we can try an on-line resize
2618 */
2619 char *e;
2620 int err = 0;
2621 unsigned long long size = simple_strtoull(buf, &e, 10);
2622 if (!*buf || *buf == '\n' ||
2623 (*e && *e != '\n'))
2624 return -EINVAL;
2625
2626 if (mddev->pers) {
2627 err = update_size(mddev, size);
850b2b42 2628 md_update_sb(mddev, 1);
a35b0d69
N		 2629 } else {
2630 if (mddev->size == 0 ||
2631 mddev->size > size)
2632 mddev->size = size;
2633 else
2634 err = -ENOSPC;
2635 }
2636 return err ? err : len;
2637}
2638
2639static struct md_sysfs_entry md_size =
80ca3a44 2640__ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
a35b0d69 2641
8bb93aac
N		 2642
2643/* Metdata version.
2644 * This is either 'none' for arrays with externally managed metadata,
2645 * or N.M for internally known formats
2646 */
2647static ssize_t
2648metadata_show(mddev_t *mddev, char *page)
2649{
2650 if (mddev->persistent)
2651 return sprintf(page, "%d.%d\n",
2652 mddev->major_version, mddev->minor_version);
2653 else
2654 return sprintf(page, "none\n");
2655}
2656
2657static ssize_t
2658metadata_store(mddev_t *mddev, const char *buf, size_t len)
2659{
2660 int major, minor;
2661 char *e;
2662 if (!list_empty(&mddev->disks))
2663 return -EBUSY;
2664
2665 if (cmd_match(buf, "none")) {
2666 mddev->persistent = 0;
2667 mddev->major_version = 0;
2668 mddev->minor_version = 90;
2669 return len;
2670 }
2671 major = simple_strtoul(buf, &e, 10);
2672 if (e==buf || *e != '.')
2673 return -EINVAL;
2674 buf = e+1;
2675 minor = simple_strtoul(buf, &e, 10);
3f9d7b0d 2676 if (e==buf || (*e && *e != '\n') )
8bb93aac 2677 return -EINVAL;
50511da3 2678 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
8bb93aac
N		 2679 return -ENOENT;
2680 mddev->major_version = major;
2681 mddev->minor_version = minor;
2682 mddev->persistent = 1;
2683 return len;
2684}
2685
2686static struct md_sysfs_entry md_metadata =
80ca3a44 2687__ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
8bb93aac 2688
24dd469d 2689static ssize_t
7eec314d 2690action_show(mddev_t *mddev, char *page)
24dd469d 2691{
7eec314d 2692 char *type = "idle";
31399d9e
N		 2693 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2694 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
ccfcc3c1
N		 2695 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2696 type = "reshape";
2697 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N		 2698 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2699 type = "resync";
2700 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2701 type = "check";
2702 else
2703 type = "repair";
2704 } else
2705 type = "recover";
2706 }
2707 return sprintf(page, "%s\n", type);
2708}
2709
2710static ssize_t
7eec314d 2711action_store(mddev_t *mddev, const char *page, size_t len)
24dd469d 2712{
7eec314d
N		 2713 if (!mddev->pers || !mddev->pers->sync_request)
2714 return -EINVAL;
2715
bce74dac 2716 if (cmd_match(page, "idle")) {
7eec314d
N		 2717 if (mddev->sync_thread) {
2718 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2719 md_unregister_thread(mddev->sync_thread);
2720 mddev->sync_thread = NULL;
2721 mddev->recovery = 0;
2722 }
03c902e1
N		 2723 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2724 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 2725 return -EBUSY;
03c902e1 2726 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
7eec314d 2727 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
16484bf5
N		 2728 else if (cmd_match(page, "reshape")) {
2729 int err;
2730 if (mddev->pers->start_reshape == NULL)
2731 return -EINVAL;
2732 err = mddev->pers->start_reshape(mddev);
2733 if (err)
2734 return err;
2735 } else {
bce74dac 2736 if (cmd_match(page, "check"))
7eec314d 2737 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2adc7d47 2738 else if (!cmd_match(page, "repair"))
7eec314d
N		 2739 return -EINVAL;
2740 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2741 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7eec314d 2742 }
03c902e1 2743 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d
N		 2744 md_wakeup_thread(mddev->thread);
2745 return len;
2746}
2747
9d88883e 2748static ssize_t
96de1e66 2749mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 2750{
2751 return sprintf(page, "%llu\n",
2752 (unsigned long long) mddev->resync_mismatches);
2753}
2754
80ca3a44
N		 2755static struct md_sysfs_entry md_scan_mode =
2756__ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 2757
96de1e66 2758
80ca3a44 2759static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 2760
88202a0c
N		 2761static ssize_t
2762sync_min_show(mddev_t *mddev, char *page)
2763{
2764 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2765 mddev->sync_speed_min ? "local": "system");
2766}
2767
2768static ssize_t
2769sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2770{
2771 int min;
2772 char *e;
2773 if (strncmp(buf, "system", 6)==0) {
2774 mddev->sync_speed_min = 0;
2775 return len;
2776 }
2777 min = simple_strtoul(buf, &e, 10);
2778 if (buf == e || (*e && *e != '\n') || min <= 0)
2779 return -EINVAL;
2780 mddev->sync_speed_min = min;
2781 return len;
2782}
2783
2784static struct md_sysfs_entry md_sync_min =
2785__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2786
2787static ssize_t
2788sync_max_show(mddev_t *mddev, char *page)
2789{
2790 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2791 mddev->sync_speed_max ? "local": "system");
2792}
2793
2794static ssize_t
2795sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2796{
2797 int max;
2798 char *e;
2799 if (strncmp(buf, "system", 6)==0) {
2800 mddev->sync_speed_max = 0;
2801 return len;
2802 }
2803 max = simple_strtoul(buf, &e, 10);
2804 if (buf == e || (*e && *e != '\n') || max <= 0)
2805 return -EINVAL;
2806 mddev->sync_speed_max = max;
2807 return len;
2808}
2809
2810static struct md_sysfs_entry md_sync_max =
2811__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2812
2813
2814static ssize_t
2815sync_speed_show(mddev_t *mddev, char *page)
2816{
2817 unsigned long resync, dt, db;
ff4e8d9a 2818 resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active));
88202a0c
N		 2819 dt = ((jiffies - mddev->resync_mark) / HZ);
2820 if (!dt) dt++;
2821 db = resync - (mddev->resync_mark_cnt);
2822 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2823}
2824
80ca3a44 2825static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
88202a0c
N		 2826
2827static ssize_t
2828sync_completed_show(mddev_t *mddev, char *page)
2829{
2830 unsigned long max_blocks, resync;
2831
2832 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2833 max_blocks = mddev->resync_max_sectors;
2834 else
2835 max_blocks = mddev->size << 1;
2836
2837 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2838 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2839}
2840
80ca3a44 2841static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
88202a0c 2842
e464eafd
N		 2843static ssize_t
2844suspend_lo_show(mddev_t *mddev, char *page)
2845{
2846 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
2847}
2848
2849static ssize_t
2850suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
2851{
2852 char *e;
2853 unsigned long long new = simple_strtoull(buf, &e, 10);
2854
2855 if (mddev->pers->quiesce == NULL)
2856 return -EINVAL;
2857 if (buf == e || (*e && *e != '\n'))
2858 return -EINVAL;
2859 if (new >= mddev->suspend_hi ||
2860 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
2861 mddev->suspend_lo = new;
2862 mddev->pers->quiesce(mddev, 2);
2863 return len;
2864 } else
2865 return -EINVAL;
2866}
2867static struct md_sysfs_entry md_suspend_lo =
2868__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
2869
2870
2871static ssize_t
2872suspend_hi_show(mddev_t *mddev, char *page)
2873{
2874 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
2875}
2876
2877static ssize_t
2878suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
2879{
2880 char *e;
2881 unsigned long long new = simple_strtoull(buf, &e, 10);
2882
2883 if (mddev->pers->quiesce == NULL)
2884 return -EINVAL;
2885 if (buf == e || (*e && *e != '\n'))
2886 return -EINVAL;
2887 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
2888 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
2889 mddev->suspend_hi = new;
2890 mddev->pers->quiesce(mddev, 1);
2891 mddev->pers->quiesce(mddev, 0);
2892 return len;
2893 } else
2894 return -EINVAL;
2895}
2896static struct md_sysfs_entry md_suspend_hi =
2897__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
2898
2899
eae1701f
N		 2900static struct attribute *md_default_attrs[] = {
2901 &md_level.attr,
d4dbd025 2902 &md_layout.attr,
eae1701f 2903 &md_raid_disks.attr,
3b34380a 2904 &md_chunk_size.attr,
a35b0d69 2905 &md_size.attr,
a94213b1 2906 &md_resync_start.attr,
8bb93aac 2907 &md_metadata.attr,
6d7ff738 2908 &md_new_device.attr,
16f17b39 2909 &md_safe_delay.attr,
9e653b63 2910 &md_array_state.attr,
411036fa
N		 2911 NULL,
2912};
2913
2914static struct attribute *md_redundancy_attrs[] = {
24dd469d 2915 &md_scan_mode.attr,
9d88883e 2916 &md_mismatches.attr,
88202a0c
N		 2917 &md_sync_min.attr,
2918 &md_sync_max.attr,
2919 &md_sync_speed.attr,
2920 &md_sync_completed.attr,
e464eafd
N		 2921 &md_suspend_lo.attr,
2922 &md_suspend_hi.attr,
9b1d1dac 2923 &md_bitmap.attr,
eae1701f
N		 2924 NULL,
2925};
411036fa
N		 2926static struct attribute_group md_redundancy_group = {
2927 .name = NULL,
2928 .attrs = md_redundancy_attrs,
2929};
2930
eae1701f
N		 2931
2932static ssize_t
2933md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2934{
2935 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2936 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2937 ssize_t rv;
eae1701f
N		 2938
2939 if (!entry->show)
2940 return -EIO;
5dc5cf7d
IM		 2941 rv = mddev_lock(mddev);
2942 if (!rv) {
2943 rv = entry->show(mddev, page);
2944 mddev_unlock(mddev);
2945 }
96de1e66 2946 return rv;
eae1701f
N		 2947}
2948
2949static ssize_t
2950md_attr_store(struct kobject *kobj, struct attribute *attr,
2951 const char *page, size_t length)
2952{
2953 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2954 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2955 ssize_t rv;
eae1701f
N		 2956
2957 if (!entry->store)
2958 return -EIO;
67463acb
N		 2959 if (!capable(CAP_SYS_ADMIN))
2960 return -EACCES;
5dc5cf7d
IM		 2961 rv = mddev_lock(mddev);
2962 if (!rv) {
2963 rv = entry->store(mddev, page, length);
2964 mddev_unlock(mddev);
2965 }
96de1e66 2966 return rv;
eae1701f
N		 2967}
2968
2969static void md_free(struct kobject *ko)
2970{
2971 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2972 kfree(mddev);
2973}
2974
2975static struct sysfs_ops md_sysfs_ops = {
2976 .show = md_attr_show,
2977 .store = md_attr_store,
2978};
2979static struct kobj_type md_ktype = {
2980 .release = md_free,
2981 .sysfs_ops = &md_sysfs_ops,
2982 .default_attrs = md_default_attrs,
2983};
2984
1da177e4
LT		 2985int mdp_major = 0;
2986
2987static struct kobject *md_probe(dev_t dev, int *part, void *data)
2988{
48c9c27b 2989 static DEFINE_MUTEX(disks_mutex);
1da177e4
LT		 2990 mddev_t *mddev = mddev_find(dev);
2991 struct gendisk *disk;
2992 int partitioned = (MAJOR(dev) != MD_MAJOR);
2993 int shift = partitioned ? MdpMinorShift : 0;
2994 int unit = MINOR(dev) >> shift;
2995
2996 if (!mddev)
2997 return NULL;
2998
48c9c27b 2999 mutex_lock(&disks_mutex);
1da177e4 3000 if (mddev->gendisk) {
48c9c27b 3001 mutex_unlock(&disks_mutex);
1da177e4
LT		 3002 mddev_put(mddev);
3003 return NULL;
3004 }
3005 disk = alloc_disk(1 << shift);
3006 if (!disk) {
48c9c27b 3007 mutex_unlock(&disks_mutex);
1da177e4
LT		 3008 mddev_put(mddev);
3009 return NULL;
3010 }
3011 disk->major = MAJOR(dev);
3012 disk->first_minor = unit << shift;
ce7b0f46 3013 if (partitioned)
1da177e4 3014 sprintf(disk->disk_name, "md_d%d", unit);
ce7b0f46 3015 else
1da177e4 3016 sprintf(disk->disk_name, "md%d", unit);
1da177e4
LT		 3017 disk->fops = &md_fops;
3018 disk->private_data = mddev;
3019 disk->queue = mddev->queue;
3020 add_disk(disk);
3021 mddev->gendisk = disk;
48c9c27b 3022 mutex_unlock(&disks_mutex);
9c791977 3023 mddev->kobj.parent = &disk->kobj;
eae1701f
N		 3024 mddev->kobj.k_name = NULL;
3025 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
3026 mddev->kobj.ktype = &md_ktype;
5e55e2f5
N		 3027 if (kobject_register(&mddev->kobj))
3028 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3029 disk->disk_name);
1da177e4
LT		 3030 return NULL;
3031}
3032
1da177e4
LT		 3033static void md_safemode_timeout(unsigned long data)
3034{
3035 mddev_t *mddev = (mddev_t *) data;
3036
3037 mddev->safemode = 1;
3038 md_wakeup_thread(mddev->thread);
3039}
3040
6ff8d8ec 3041static int start_dirty_degraded;
1da177e4
LT		 3042
3043static int do_md_run(mddev_t * mddev)
3044{
2604b703 3045 int err;
1da177e4
LT		 3046 int chunk_size;
3047 struct list_head *tmp;
3048 mdk_rdev_t *rdev;
3049 struct gendisk *disk;
2604b703 3050 struct mdk_personality *pers;
1da177e4
LT		 3051 char b[BDEVNAME_SIZE];
3052
a757e64c
N		 3053 if (list_empty(&mddev->disks))
3054 /* cannot run an array with no devices.. */
1da177e4 3055 return -EINVAL;
1da177e4
LT		 3056
3057 if (mddev->pers)
3058 return -EBUSY;
3059
3060 /*
3061 * Analyze all RAID superblock(s)
3062 */
a757e64c
N		 3063 if (!mddev->raid_disks)
3064 analyze_sbs(mddev);
1da177e4
LT		 3065
3066 chunk_size = mddev->chunk_size;
2604b703
N		 3067
3068 if (chunk_size) {
1da177e4
LT		 3069 if (chunk_size > MAX_CHUNK_SIZE) {
3070 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3071 chunk_size, MAX_CHUNK_SIZE);
3072 return -EINVAL;
3073 }
3074 /*
3075 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3076 */
3077 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 3078 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 3079 return -EINVAL;
3080 }
3081 if (chunk_size < PAGE_SIZE) {
3082 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
3083 chunk_size, PAGE_SIZE);
3084 return -EINVAL;
3085 }
3086
3087 /* devices must have minimum size of one chunk */
3088 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 3089 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3090 continue;
3091 if (rdev->size < chunk_size / 1024) {
3092 printk(KERN_WARNING
3093 "md: Dev %s smaller than chunk_size:"
3094 " %lluk < %dk\n",
3095 bdevname(rdev->bdev,b),
3096 (unsigned long long)rdev->size,
3097 chunk_size / 1024);
3098 return -EINVAL;
3099 }
3100 }
3101 }
3102
1da177e4 3103#ifdef CONFIG_KMOD
d9d166c2
N		 3104 if (mddev->level != LEVEL_NONE)
3105 request_module("md-level-%d", mddev->level);
3106 else if (mddev->clevel[0])
3107 request_module("md-%s", mddev->clevel);
1da177e4
LT		 3108#endif
3109
3110 /*
3111 * Drop all container device buffers, from now on
3112 * the only valid external interface is through the md
3113 * device.
3114 * Also find largest hardsector size
3115 */
3116 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 3117 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3118 continue;
3119 sync_blockdev(rdev->bdev);
f98393a6 3120 invalidate_bdev(rdev->bdev);
1da177e4
LT		 3121 }
3122
3123 md_probe(mddev->unit, NULL, NULL);
3124 disk = mddev->gendisk;
3125 if (!disk)
3126 return -ENOMEM;
3127
3128 spin_lock(&pers_lock);
d9d166c2 3129 pers = find_pers(mddev->level, mddev->clevel);
2604b703 3130 if (!pers || !try_module_get(pers->owner)) {
1da177e4 3131 spin_unlock(&pers_lock);
d9d166c2
N		 3132 if (mddev->level != LEVEL_NONE)
3133 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3134 mddev->level);
3135 else
3136 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3137 mddev->clevel);
1da177e4
LT		 3138 return -EINVAL;
3139 }
2604b703 3140 mddev->pers = pers;
1da177e4 3141 spin_unlock(&pers_lock);
d9d166c2
N		 3142 mddev->level = pers->level;
3143 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
1da177e4 3144
f6705578 3145 if (mddev->reshape_position != MaxSector &&
63c70c4f 3146 pers->start_reshape == NULL) {
f6705578
N		 3147 /* This personality cannot handle reshaping... */
3148 mddev->pers = NULL;
3149 module_put(pers->owner);
3150 return -EINVAL;
3151 }
3152
7dd5e7c3
N		 3153 if (pers->sync_request) {
3154 /* Warn if this is a potentially silly
3155 * configuration.
3156 */
3157 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3158 mdk_rdev_t *rdev2;
3159 struct list_head *tmp2;
3160 int warned = 0;
3161 ITERATE_RDEV(mddev, rdev, tmp) {
3162 ITERATE_RDEV(mddev, rdev2, tmp2) {
3163 if (rdev < rdev2 &&
3164 rdev->bdev->bd_contains ==
3165 rdev2->bdev->bd_contains) {
3166 printk(KERN_WARNING
3167 "%s: WARNING: %s appears to be"
3168 " on the same physical disk as"
3169 " %s.\n",
3170 mdname(mddev),
3171 bdevname(rdev->bdev,b),
3172 bdevname(rdev2->bdev,b2));
3173 warned = 1;
3174 }
3175 }
3176 }
3177 if (warned)
3178 printk(KERN_WARNING
3179 "True protection against single-disk"
3180 " failure might be compromised.\n");
3181 }
3182
657390d2 3183 mddev->recovery = 0;
1da177e4 3184 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 3185 mddev->barriers_work = 1;
6ff8d8ec 3186 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 3187
f91de92e
N		 3188 if (start_readonly)
3189 mddev->ro = 2; /* read-only, but switch on first write */
3190
b15c2e57
N		 3191 err = mddev->pers->run(mddev);
3192 if (!err && mddev->pers->sync_request) {
3193 err = bitmap_create(mddev);
3194 if (err) {
3195 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3196 mdname(mddev), err);
3197 mddev->pers->stop(mddev);
3198 }
3199 }
1da177e4
LT		 3200 if (err) {
3201 printk(KERN_ERR "md: pers->run() failed ...\n");
3202 module_put(mddev->pers->owner);
3203 mddev->pers = NULL;
32a7627c
N		 3204 bitmap_destroy(mddev);
3205 return err;
1da177e4 3206 }
5e55e2f5
N		 3207 if (mddev->pers->sync_request) {
3208 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3209 printk(KERN_WARNING
3210 "md: cannot register extra attributes for %s\n",
3211 mdname(mddev));
3212 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
fd9d49ca
N		 3213 mddev->ro = 0;
3214
1da177e4
LT		 3215 atomic_set(&mddev->writes_pending,0);
3216 mddev->safemode = 0;
3217 mddev->safemode_timer.function = md_safemode_timeout;
3218 mddev->safemode_timer.data = (unsigned long) mddev;
16f17b39 3219 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
1da177e4 3220 mddev->in_sync = 1;
86e6ffdd
N		 3221
3222 ITERATE_RDEV(mddev,rdev,tmp)
3223 if (rdev->raid_disk >= 0) {
3224 char nm[20];
3225 sprintf(nm, "rd%d", rdev->raid_disk);
5e55e2f5
N		 3226 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3227 printk("md: cannot register %s for %s\n",
3228 nm, mdname(mddev));
86e6ffdd 3229 }
1da177e4
LT		 3230
3231 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3232
850b2b42
N		 3233 if (mddev->flags)
3234 md_update_sb(mddev, 0);
1da177e4
LT		 3235
3236 set_capacity(disk, mddev->array_size<<1);
3237
3238 /* If we call blk_queue_make_request here, it will
3239 * re-initialise max_sectors etc which may have been
3240 * refined inside -> run. So just set the bits we need to set.
3241 * Most initialisation happended when we called
3242 * blk_queue_make_request(..., md_fail_request)
3243 * earlier.
3244 */
3245 mddev->queue->queuedata = mddev;
3246 mddev->queue->make_request_fn = mddev->pers->make_request;
3247
5fd6c1dc
N		 3248 /* If there is a partially-recovered drive we need to
3249 * start recovery here. If we leave it to md_check_recovery,
3250 * it will remove the drives and not do the right thing
3251 */
0b8c9de0 3252 if (mddev->degraded && !mddev->sync_thread) {
5fd6c1dc
N		 3253 struct list_head *rtmp;
3254 int spares = 0;
3255 ITERATE_RDEV(mddev,rdev,rtmp)
3256 if (rdev->raid_disk >= 0 &&
3257 !test_bit(In_sync, &rdev->flags) &&
3258 !test_bit(Faulty, &rdev->flags))
3259 /* complete an interrupted recovery */
3260 spares++;
3261 if (spares && mddev->pers->sync_request) {
3262 mddev->recovery = 0;
3263 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3264 mddev->sync_thread = md_register_thread(md_do_sync,
3265 mddev,
3266 "%s_resync");
3267 if (!mddev->sync_thread) {
3268 printk(KERN_ERR "%s: could not start resync"
3269 " thread...\n",
3270 mdname(mddev));
3271 /* leave the spares where they are, it shouldn't hurt */
3272 mddev->recovery = 0;
0b8c9de0 3273 }
5fd6c1dc
N		 3274 }
3275 }
0b8c9de0
N		 3276 md_wakeup_thread(mddev->thread);
3277 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5fd6c1dc 3278
1da177e4 3279 mddev->changed = 1;
d7603b7e 3280 md_new_event(mddev);
2f471303 3281 kobject_uevent(&mddev->gendisk->kobj, KOBJ_CHANGE);
1da177e4
LT		 3282 return 0;
3283}
3284
3285static int restart_array(mddev_t *mddev)
3286{
3287 struct gendisk *disk = mddev->gendisk;
3288 int err;
3289
3290 /*
3291 * Complain if it has no devices
3292 */
3293 err = -ENXIO;
3294 if (list_empty(&mddev->disks))
3295 goto out;
3296
3297 if (mddev->pers) {
3298 err = -EBUSY;
3299 if (!mddev->ro)
3300 goto out;
3301
3302 mddev->safemode = 0;
3303 mddev->ro = 0;
3304 set_disk_ro(disk, 0);
3305
3306 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3307 mdname(mddev));
3308 /*
3309 * Kick recovery or resync if necessary
3310 */
3311 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3312 md_wakeup_thread(mddev->thread);
5fd6c1dc 3313 md_wakeup_thread(mddev->sync_thread);
1da177e4 3314 err = 0;
9e653b63 3315 } else
1da177e4 3316 err = -EINVAL;
1da177e4
LT		 3317
3318out:
3319 return err;
3320}
3321
acc55e22
N		 3322/* similar to deny_write_access, but accounts for our holding a reference
3323 * to the file ourselves */
3324static int deny_bitmap_write_access(struct file * file)
3325{
3326 struct inode *inode = file->f_mapping->host;
3327
3328 spin_lock(&inode->i_lock);
3329 if (atomic_read(&inode->i_writecount) > 1) {
3330 spin_unlock(&inode->i_lock);
3331 return -ETXTBSY;
3332 }
3333 atomic_set(&inode->i_writecount, -1);
3334 spin_unlock(&inode->i_lock);
3335
3336 return 0;
3337}
3338
3339static void restore_bitmap_write_access(struct file *file)
3340{
3341 struct inode *inode = file->f_mapping->host;
3342
3343 spin_lock(&inode->i_lock);
3344 atomic_set(&inode->i_writecount, 1);
3345 spin_unlock(&inode->i_lock);
3346}
3347
9e653b63
N		 3348/* mode:
3349 * 0 - completely stop and dis-assemble array
3350 * 1 - switch to readonly
3351 * 2 - stop but do not disassemble array
3352 */
3353static int do_md_stop(mddev_t * mddev, int mode)
1da177e4
LT		 3354{
3355 int err = 0;
3356 struct gendisk *disk = mddev->gendisk;
3357
3358 if (mddev->pers) {
3359 if (atomic_read(&mddev->active)>2) {
3360 printk("md: %s still in use.\n",mdname(mddev));
3361 return -EBUSY;
3362 }
3363
3364 if (mddev->sync_thread) {
5fd6c1dc 3365 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4
LT		 3366 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3367 md_unregister_thread(mddev->sync_thread);
3368 mddev->sync_thread = NULL;
3369 }
3370
3371 del_timer_sync(&mddev->safemode_timer);
3372
3373 invalidate_partition(disk, 0);
3374
9e653b63
N		 3375 switch(mode) {
3376 case 1: /* readonly */
1da177e4 3377 err = -ENXIO;
f91de92e 3378 if (mddev->ro==1)
1da177e4
LT		 3379 goto out;
3380 mddev->ro = 1;
9e653b63
N		 3381 break;
3382 case 0: /* disassemble */
3383 case 2: /* stop */
6b8b3e8a 3384 bitmap_flush(mddev);
a9701a30 3385 md_super_wait(mddev);
1da177e4
LT		 3386 if (mddev->ro)
3387 set_disk_ro(disk, 0);
3388 blk_queue_make_request(mddev->queue, md_fail_request);
3389 mddev->pers->stop(mddev);
d1b5380c
N		 3390 mddev->queue->merge_bvec_fn = NULL;
3391 mddev->queue->unplug_fn = NULL;
3392 mddev->queue->issue_flush_fn = NULL;
041ae52e 3393 mddev->queue->backing_dev_info.congested_fn = NULL;
411036fa
N		 3394 if (mddev->pers->sync_request)
3395 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3396
1da177e4
LT		 3397 module_put(mddev->pers->owner);
3398 mddev->pers = NULL;
0d4ca600
N		 3399
3400 set_capacity(disk, 0);
3401 mddev->changed = 1;
3402
1da177e4
LT		 3403 if (mddev->ro)
3404 mddev->ro = 0;
3405 }
850b2b42 3406 if (!mddev->in_sync || mddev->flags) {
1da177e4
LT		 3407 /* mark array as shutdown cleanly */
3408 mddev->in_sync = 1;
850b2b42 3409 md_update_sb(mddev, 1);
1da177e4 3410 }
9e653b63 3411 if (mode == 1)
1da177e4 3412 set_disk_ro(disk, 1);
5fd6c1dc 3413 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4 3414 }
32a7627c 3415
1da177e4
LT		 3416 /*
3417 * Free resources if final stop
3418 */
9e653b63 3419 if (mode == 0) {
86e6ffdd
N		 3420 mdk_rdev_t *rdev;
3421 struct list_head *tmp;
0d4ca600 3422
1da177e4
LT		 3423 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3424
978f946b
N		 3425 bitmap_destroy(mddev);
3426 if (mddev->bitmap_file) {
acc55e22 3427 restore_bitmap_write_access(mddev->bitmap_file);
978f946b
N		 3428 fput(mddev->bitmap_file);
3429 mddev->bitmap_file = NULL;
3430 }
3431 mddev->bitmap_offset = 0;
3432
86e6ffdd
N		 3433 ITERATE_RDEV(mddev,rdev,tmp)
3434 if (rdev->raid_disk >= 0) {
3435 char nm[20];
3436 sprintf(nm, "rd%d", rdev->raid_disk);
3437 sysfs_remove_link(&mddev->kobj, nm);
3438 }
3439
5792a285
N		 3440 /* make sure all delayed_delete calls have finished */
3441 flush_scheduled_work();
3442
1da177e4
LT		 3443 export_array(mddev);
3444
3445 mddev->array_size = 0;
9e653b63
N		 3446 mddev->size = 0;
3447 mddev->raid_disks = 0;
a94213b1 3448 mddev->recovery_cp = 0;
9e653b63 3449
a8a55c38 3450 } else if (mddev->pers)
1da177e4
LT		 3451 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3452 mdname(mddev));
3453 err = 0;
d7603b7e 3454 md_new_event(mddev);
1da177e4
LT		 3455out:
3456 return err;
3457}
3458
fdee8ae4 3459#ifndef MODULE
1da177e4
LT		 3460static void autorun_array(mddev_t *mddev)
3461{
3462 mdk_rdev_t *rdev;
3463 struct list_head *tmp;
3464 int err;
3465
a757e64c 3466 if (list_empty(&mddev->disks))
1da177e4 3467 return;
1da177e4
LT		 3468
3469 printk(KERN_INFO "md: running: ");
3470
3471 ITERATE_RDEV(mddev,rdev,tmp) {
3472 char b[BDEVNAME_SIZE];
3473 printk("<%s>", bdevname(rdev->bdev,b));
3474 }
3475 printk("\n");
3476
3477 err = do_md_run (mddev);
3478 if (err) {
3479 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3480 do_md_stop (mddev, 0);
3481 }
3482}
3483
3484/*
3485 * lets try to run arrays based on all disks that have arrived
3486 * until now. (those are in pending_raid_disks)
3487 *
3488 * the method: pick the first pending disk, collect all disks with
3489 * the same UUID, remove all from the pending list and put them into
3490 * the 'same_array' list. Then order this list based on superblock
3491 * update time (freshest comes first), kick out 'old' disks and
3492 * compare superblocks. If everything's fine then run it.
3493 *
3494 * If "unit" is allocated, then bump its reference count
3495 */
3496static void autorun_devices(int part)
3497{
1da177e4
LT		 3498 struct list_head *tmp;
3499 mdk_rdev_t *rdev0, *rdev;
3500 mddev_t *mddev;
3501 char b[BDEVNAME_SIZE];
3502
3503 printk(KERN_INFO "md: autorun ...\n");
3504 while (!list_empty(&pending_raid_disks)) {
e8703fe1 3505 int unit;
1da177e4 3506 dev_t dev;
ad01c9e3 3507 LIST_HEAD(candidates);
1da177e4
LT		 3508 rdev0 = list_entry(pending_raid_disks.next,
3509 mdk_rdev_t, same_set);
3510
3511 printk(KERN_INFO "md: considering %s ...\n",
3512 bdevname(rdev0->bdev,b));
3513 INIT_LIST_HEAD(&candidates);
3514 ITERATE_RDEV_PENDING(rdev,tmp)
3515 if (super_90_load(rdev, rdev0, 0) >= 0) {
3516 printk(KERN_INFO "md: adding %s ...\n",
3517 bdevname(rdev->bdev,b));
3518 list_move(&rdev->same_set, &candidates);
3519 }
3520 /*
3521 * now we have a set of devices, with all of them having
3522 * mostly sane superblocks. It's time to allocate the
3523 * mddev.
3524 */
e8703fe1
N		 3525 if (part) {
3526 dev = MKDEV(mdp_major,
3527 rdev0->preferred_minor << MdpMinorShift);
3528 unit = MINOR(dev) >> MdpMinorShift;
3529 } else {
3530 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3531 unit = MINOR(dev);
3532 }
3533 if (rdev0->preferred_minor != unit) {
1da177e4
LT		 3534 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3535 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3536 break;
3537 }
1da177e4
LT		 3538
3539 md_probe(dev, NULL, NULL);
3540 mddev = mddev_find(dev);
3541 if (!mddev) {
3542 printk(KERN_ERR
3543 "md: cannot allocate memory for md drive.\n");
3544 break;
3545 }
3546 if (mddev_lock(mddev))
3547 printk(KERN_WARNING "md: %s locked, cannot run\n",
3548 mdname(mddev));
3549 else if (mddev->raid_disks || mddev->major_version
3550 || !list_empty(&mddev->disks)) {
3551 printk(KERN_WARNING
3552 "md: %s already running, cannot run %s\n",
3553 mdname(mddev), bdevname(rdev0->bdev,b));
3554 mddev_unlock(mddev);
3555 } else {
3556 printk(KERN_INFO "md: created %s\n", mdname(mddev));
3557 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
3558 list_del_init(&rdev->same_set);
3559 if (bind_rdev_to_array(rdev, mddev))
3560 export_rdev(rdev);
3561 }
3562 autorun_array(mddev);
3563 mddev_unlock(mddev);
3564 }
3565 /* on success, candidates will be empty, on error
3566 * it won't...
3567 */
3568 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
3569 export_rdev(rdev);
3570 mddev_put(mddev);
3571 }
3572 printk(KERN_INFO "md: ... autorun DONE.\n");
3573}
fdee8ae4 3574#endif /* !MODULE */
1da177e4 3575
1da177e4
LT		 3576static int get_version(void __user * arg)
3577{
3578 mdu_version_t ver;
3579
3580 ver.major = MD_MAJOR_VERSION;
3581 ver.minor = MD_MINOR_VERSION;
3582 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3583
3584 if (copy_to_user(arg, &ver, sizeof(ver)))
3585 return -EFAULT;
3586
3587 return 0;
3588}
3589
3590static int get_array_info(mddev_t * mddev, void __user * arg)
3591{
3592 mdu_array_info_t info;
3593 int nr,working,active,failed,spare;
3594 mdk_rdev_t *rdev;
3595 struct list_head *tmp;
3596
3597 nr=working=active=failed=spare=0;
3598 ITERATE_RDEV(mddev,rdev,tmp) {
3599 nr++;
b2d444d7 3600 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3601 failed++;
3602 else {
3603 working++;
b2d444d7 3604 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 3605 active++;
3606 else
3607 spare++;
3608 }
3609 }
3610
3611 info.major_version = mddev->major_version;
3612 info.minor_version = mddev->minor_version;
3613 info.patch_version = MD_PATCHLEVEL_VERSION;
3614 info.ctime = mddev->ctime;
3615 info.level = mddev->level;
3616 info.size = mddev->size;
284ae7ca
N		 3617 if (info.size != mddev->size) /* overflow */
3618 info.size = -1;
1da177e4
LT		 3619 info.nr_disks = nr;
3620 info.raid_disks = mddev->raid_disks;
3621 info.md_minor = mddev->md_minor;
3622 info.not_persistent= !mddev->persistent;
3623
3624 info.utime = mddev->utime;
3625 info.state = 0;
3626 if (mddev->in_sync)
3627 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 3628 if (mddev->bitmap && mddev->bitmap_offset)
3629 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 3630 info.active_disks = active;
3631 info.working_disks = working;
3632 info.failed_disks = failed;
3633 info.spare_disks = spare;
3634
3635 info.layout = mddev->layout;
3636 info.chunk_size = mddev->chunk_size;
3637
3638 if (copy_to_user(arg, &info, sizeof(info)))
3639 return -EFAULT;
3640
3641 return 0;
3642}
3643
87162a28 3644static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 3645{
3646 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3647 char *ptr, *buf = NULL;
3648 int err = -ENOMEM;
3649
2a2275d6
N		 3650 md_allow_write(mddev);
3651
32a7627c
N		 3652 file = kmalloc(sizeof(*file), GFP_KERNEL);
3653 if (!file)
3654 goto out;
3655
3656 /* bitmap disabled, zero the first byte and copy out */
3657 if (!mddev->bitmap || !mddev->bitmap->file) {
3658 file->pathname[0] = '\0';
3659 goto copy_out;
3660 }
3661
3662 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3663 if (!buf)
3664 goto out;
3665
3666 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3667 if (!ptr)
3668 goto out;
3669
3670 strcpy(file->pathname, ptr);
3671
3672copy_out:
3673 err = 0;
3674 if (copy_to_user(arg, file, sizeof(*file)))
3675 err = -EFAULT;
3676out:
3677 kfree(buf);
3678 kfree(file);
3679 return err;
3680}
3681
1da177e4
LT		 3682static int get_disk_info(mddev_t * mddev, void __user * arg)
3683{
3684 mdu_disk_info_t info;
3685 unsigned int nr;
3686 mdk_rdev_t *rdev;
3687
3688 if (copy_from_user(&info, arg, sizeof(info)))
3689 return -EFAULT;
3690
3691 nr = info.number;
3692
3693 rdev = find_rdev_nr(mddev, nr);
3694 if (rdev) {
3695 info.major = MAJOR(rdev->bdev->bd_dev);
3696 info.minor = MINOR(rdev->bdev->bd_dev);
3697 info.raid_disk = rdev->raid_disk;
3698 info.state = 0;
b2d444d7 3699 if (test_bit(Faulty, &rdev->flags))
1da177e4 3700 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 3701 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 3702 info.state |= (1<<MD_DISK_ACTIVE);
3703 info.state |= (1<<MD_DISK_SYNC);
3704 }
8ddf9efe
N		 3705 if (test_bit(WriteMostly, &rdev->flags))
3706 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 3707 } else {
3708 info.major = info.minor = 0;
3709 info.raid_disk = -1;
3710 info.state = (1<<MD_DISK_REMOVED);
3711 }
3712
3713 if (copy_to_user(arg, &info, sizeof(info)))
3714 return -EFAULT;
3715
3716 return 0;
3717}
3718
3719static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3720{
3721 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3722 mdk_rdev_t *rdev;
3723 dev_t dev = MKDEV(info->major,info->minor);
3724
3725 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3726 return -EOVERFLOW;
3727
3728 if (!mddev->raid_disks) {
3729 int err;
3730 /* expecting a device which has a superblock */
3731 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3732 if (IS_ERR(rdev)) {
3733 printk(KERN_WARNING
3734 "md: md_import_device returned %ld\n",
3735 PTR_ERR(rdev));
3736 return PTR_ERR(rdev);
3737 }
3738 if (!list_empty(&mddev->disks)) {
3739 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3740 mdk_rdev_t, same_set);
3741 int err = super_types[mddev->major_version]
3742 .load_super(rdev, rdev0, mddev->minor_version);
3743 if (err < 0) {
3744 printk(KERN_WARNING
3745 "md: %s has different UUID to %s\n",
3746 bdevname(rdev->bdev,b),
3747 bdevname(rdev0->bdev,b2));
3748 export_rdev(rdev);
3749 return -EINVAL;
3750 }
3751 }
3752 err = bind_rdev_to_array(rdev, mddev);
3753 if (err)
3754 export_rdev(rdev);
3755 return err;
3756 }
3757
3758 /*
3759 * add_new_disk can be used once the array is assembled
3760 * to add "hot spares". They must already have a superblock
3761 * written
3762 */
3763 if (mddev->pers) {
3764 int err;
3765 if (!mddev->pers->hot_add_disk) {
3766 printk(KERN_WARNING
3767 "%s: personality does not support diskops!\n",
3768 mdname(mddev));
3769 return -EINVAL;
3770 }
7b1e35f6
N		 3771 if (mddev->persistent)
3772 rdev = md_import_device(dev, mddev->major_version,
3773 mddev->minor_version);
3774 else
3775 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 3776 if (IS_ERR(rdev)) {
3777 printk(KERN_WARNING
3778 "md: md_import_device returned %ld\n",
3779 PTR_ERR(rdev));
3780 return PTR_ERR(rdev);
3781 }
41158c7e
N		 3782 /* set save_raid_disk if appropriate */
3783 if (!mddev->persistent) {
3784 if (info->state & (1<<MD_DISK_SYNC) &&
3785 info->raid_disk < mddev->raid_disks)
3786 rdev->raid_disk = info->raid_disk;
3787 else
3788 rdev->raid_disk = -1;
3789 } else
3790 super_types[mddev->major_version].
3791 validate_super(mddev, rdev);
3792 rdev->saved_raid_disk = rdev->raid_disk;
3793
b2d444d7 3794 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 3795 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3796 set_bit(WriteMostly, &rdev->flags);
3797
1da177e4
LT		 3798 rdev->raid_disk = -1;
3799 err = bind_rdev_to_array(rdev, mddev);
7c7546cc
N		 3800 if (!err && !mddev->pers->hot_remove_disk) {
3801 /* If there is hot_add_disk but no hot_remove_disk
3802 * then added disks for geometry changes,
3803 * and should be added immediately.
3804 */
3805 super_types[mddev->major_version].
3806 validate_super(mddev, rdev);
3807 err = mddev->pers->hot_add_disk(mddev, rdev);
3808 if (err)
3809 unbind_rdev_from_array(rdev);
3810 }
1da177e4
LT		 3811 if (err)
3812 export_rdev(rdev);
c361777f 3813
17571284 3814 md_update_sb(mddev, 1);
c361777f 3815 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 3816 md_wakeup_thread(mddev->thread);
1da177e4
LT		 3817 return err;
3818 }
3819
3820 /* otherwise, add_new_disk is only allowed
3821 * for major_version==0 superblocks
3822 */
3823 if (mddev->major_version != 0) {
3824 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3825 mdname(mddev));
3826 return -EINVAL;
3827 }
3828
3829 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3830 int err;
3831 rdev = md_import_device (dev, -1, 0);
3832 if (IS_ERR(rdev)) {
3833 printk(KERN_WARNING
3834 "md: error, md_import_device() returned %ld\n",
3835 PTR_ERR(rdev));
3836 return PTR_ERR(rdev);
3837 }
3838 rdev->desc_nr = info->number;
3839 if (info->raid_disk < mddev->raid_disks)
3840 rdev->raid_disk = info->raid_disk;
3841 else
3842 rdev->raid_disk = -1;
3843
b2d444d7
N		 3844 rdev->flags = 0;
3845
1da177e4 3846 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 3847 if (info->state & (1<<MD_DISK_SYNC))
3848 set_bit(In_sync, &rdev->flags);
1da177e4 3849
8ddf9efe
N		 3850 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3851 set_bit(WriteMostly, &rdev->flags);
3852
1da177e4
LT		 3853 if (!mddev->persistent) {
3854 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3855 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3856 } else
3857 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3858 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3859
2bf071bf
N		 3860 err = bind_rdev_to_array(rdev, mddev);
3861 if (err) {
3862 export_rdev(rdev);
3863 return err;
3864 }
1da177e4
LT		 3865 }
3866
3867 return 0;
3868}
3869
3870static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3871{
3872 char b[BDEVNAME_SIZE];
3873 mdk_rdev_t *rdev;
3874
3875 if (!mddev->pers)
3876 return -ENODEV;
3877
3878 rdev = find_rdev(mddev, dev);
3879 if (!rdev)
3880 return -ENXIO;
3881
3882 if (rdev->raid_disk >= 0)
3883 goto busy;
3884
3885 kick_rdev_from_array(rdev);
850b2b42 3886 md_update_sb(mddev, 1);
d7603b7e 3887 md_new_event(mddev);
1da177e4
LT		 3888
3889 return 0;
3890busy:
3891 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3892 bdevname(rdev->bdev,b), mdname(mddev));
3893 return -EBUSY;
3894}
3895
3896static int hot_add_disk(mddev_t * mddev, dev_t dev)
3897{
3898 char b[BDEVNAME_SIZE];
3899 int err;
3900 unsigned int size;
3901 mdk_rdev_t *rdev;
3902
3903 if (!mddev->pers)
3904 return -ENODEV;
3905
3906 if (mddev->major_version != 0) {
3907 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3908 " version-0 superblocks.\n",
3909 mdname(mddev));
3910 return -EINVAL;
3911 }
3912 if (!mddev->pers->hot_add_disk) {
3913 printk(KERN_WARNING
3914 "%s: personality does not support diskops!\n",
3915 mdname(mddev));
3916 return -EINVAL;
3917 }
3918
3919 rdev = md_import_device (dev, -1, 0);
3920 if (IS_ERR(rdev)) {
3921 printk(KERN_WARNING
3922 "md: error, md_import_device() returned %ld\n",
3923 PTR_ERR(rdev));
3924 return -EINVAL;
3925 }
3926
3927 if (mddev->persistent)
3928 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3929 else
3930 rdev->sb_offset =
3931 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3932
3933 size = calc_dev_size(rdev, mddev->chunk_size);
3934 rdev->size = size;
3935
b2d444d7 3936 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 3937 printk(KERN_WARNING
3938 "md: can not hot-add faulty %s disk to %s!\n",
3939 bdevname(rdev->bdev,b), mdname(mddev));
3940 err = -EINVAL;
3941 goto abort_export;
3942 }
b2d444d7 3943 clear_bit(In_sync, &rdev->flags);
1da177e4 3944 rdev->desc_nr = -1;
5842730d 3945 rdev->saved_raid_disk = -1;
2bf071bf
N		 3946 err = bind_rdev_to_array(rdev, mddev);
3947 if (err)
3948 goto abort_export;
1da177e4
LT		 3949
3950 /*
3951 * The rest should better be atomic, we can have disk failures
3952 * noticed in interrupt contexts ...
3953 */
3954
3955 if (rdev->desc_nr == mddev->max_disks) {
3956 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
3957 mdname(mddev));
3958 err = -EBUSY;
3959 goto abort_unbind_export;
3960 }
3961
3962 rdev->raid_disk = -1;
3963
850b2b42 3964 md_update_sb(mddev, 1);
1da177e4
LT		 3965
3966 /*
3967 * Kick recovery, maybe this spare has to be added to the
3968 * array immediately.
3969 */
3970 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3971 md_wakeup_thread(mddev->thread);
d7603b7e 3972 md_new_event(mddev);
1da177e4
LT		 3973 return 0;
3974
3975abort_unbind_export:
3976 unbind_rdev_from_array(rdev);
3977
3978abort_export:
3979 export_rdev(rdev);
3980 return err;
3981}
3982
32a7627c
N		 3983static int set_bitmap_file(mddev_t *mddev, int fd)
3984{
3985 int err;
3986
36fa3063
N		 3987 if (mddev->pers) {
3988 if (!mddev->pers->quiesce)
3989 return -EBUSY;
3990 if (mddev->recovery || mddev->sync_thread)
3991 return -EBUSY;
3992 /* we should be able to change the bitmap.. */
3993 }
32a7627c 3994
32a7627c 3995
36fa3063
N		 3996 if (fd >= 0) {
3997 if (mddev->bitmap)
3998 return -EEXIST; /* cannot add when bitmap is present */
3999 mddev->bitmap_file = fget(fd);
32a7627c 4000
36fa3063
N		 4001 if (mddev->bitmap_file == NULL) {
4002 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4003 mdname(mddev));
4004 return -EBADF;
4005 }
4006
4007 err = deny_bitmap_write_access(mddev->bitmap_file);
4008 if (err) {
4009 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4010 mdname(mddev));
4011 fput(mddev->bitmap_file);
4012 mddev->bitmap_file = NULL;
4013 return err;
4014 }
a654b9d8 4015 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 4016 } else if (mddev->bitmap == NULL)
4017 return -ENOENT; /* cannot remove what isn't there */
4018 err = 0;
4019 if (mddev->pers) {
4020 mddev->pers->quiesce(mddev, 1);
4021 if (fd >= 0)
4022 err = bitmap_create(mddev);
d7375ab3 4023 if (fd < 0 || err) {
36fa3063 4024 bitmap_destroy(mddev);
d7375ab3
N		 4025 fd = -1; /* make sure to put the file */
4026 }
36fa3063 4027 mddev->pers->quiesce(mddev, 0);
d7375ab3
N		 4028 }
4029 if (fd < 0) {
acc55e22
N		 4030 if (mddev->bitmap_file) {
4031 restore_bitmap_write_access(mddev->bitmap_file);
36fa3063 4032 fput(mddev->bitmap_file);
acc55e22 4033 }
36fa3063
N		 4034 mddev->bitmap_file = NULL;
4035 }
4036
32a7627c
N		 4037 return err;
4038}
4039
1da177e4
LT		 4040/*
4041 * set_array_info is used two different ways
4042 * The original usage is when creating a new array.
4043 * In this usage, raid_disks is > 0 and it together with
4044 * level, size, not_persistent,layout,chunksize determine the
4045 * shape of the array.
4046 * This will always create an array with a type-0.90.0 superblock.
4047 * The newer usage is when assembling an array.
4048 * In this case raid_disks will be 0, and the major_version field is
4049 * use to determine which style super-blocks are to be found on the devices.
4050 * The minor and patch _version numbers are also kept incase the
4051 * super_block handler wishes to interpret them.
4052 */
4053static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4054{
4055
4056 if (info->raid_disks == 0) {
4057 /* just setting version number for superblock loading */
4058 if (info->major_version < 0 ||
50511da3 4059 info->major_version >= ARRAY_SIZE(super_types) ||
1da177e4
LT		 4060 super_types[info->major_version].name == NULL) {
4061 /* maybe try to auto-load a module? */
4062 printk(KERN_INFO
4063 "md: superblock version %d not known\n",
4064 info->major_version);
4065 return -EINVAL;
4066 }
4067 mddev->major_version = info->major_version;
4068 mddev->minor_version = info->minor_version;
4069 mddev->patch_version = info->patch_version;
3f9d7b0d 4070 mddev->persistent = !info->not_persistent;
1da177e4
LT		 4071 return 0;
4072 }
4073 mddev->major_version = MD_MAJOR_VERSION;
4074 mddev->minor_version = MD_MINOR_VERSION;
4075 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4076 mddev->ctime = get_seconds();
4077
4078 mddev->level = info->level;
17115e03 4079 mddev->clevel[0] = 0;
1da177e4
LT		 4080 mddev->size = info->size;
4081 mddev->raid_disks = info->raid_disks;
4082 /* don't set md_minor, it is determined by which /dev/md* was
4083 * openned
4084 */
4085 if (info->state & (1<<MD_SB_CLEAN))
4086 mddev->recovery_cp = MaxSector;
4087 else
4088 mddev->recovery_cp = 0;
4089 mddev->persistent = ! info->not_persistent;
4090
4091 mddev->layout = info->layout;
4092 mddev->chunk_size = info->chunk_size;
4093
4094 mddev->max_disks = MD_SB_DISKS;
4095
850b2b42
N		 4096 mddev->flags = 0;
4097 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 4098
b2a2703c
N		 4099 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4100 mddev->bitmap_offset = 0;
4101
f6705578
N		 4102 mddev->reshape_position = MaxSector;
4103
1da177e4
LT		 4104 /*
4105 * Generate a 128 bit UUID
4106 */
4107 get_random_bytes(mddev->uuid, 16);
4108
f6705578
N		 4109 mddev->new_level = mddev->level;
4110 mddev->new_chunk = mddev->chunk_size;
4111 mddev->new_layout = mddev->layout;
4112 mddev->delta_disks = 0;
4113
1da177e4
LT		 4114 return 0;
4115}
4116
a35b0d69
N		 4117static int update_size(mddev_t *mddev, unsigned long size)
4118{
4119 mdk_rdev_t * rdev;
4120 int rv;
4121 struct list_head *tmp;
8ddeeae5 4122 int fit = (size == 0);
a35b0d69
N		 4123
4124 if (mddev->pers->resize == NULL)
4125 return -EINVAL;
4126 /* The "size" is the amount of each device that is used.
4127 * This can only make sense for arrays with redundancy.
4128 * linear and raid0 always use whatever space is available
4129 * We can only consider changing the size if no resync
4130 * or reconstruction is happening, and if the new size
4131 * is acceptable. It must fit before the sb_offset or,
4132 * if that is <data_offset, it must fit before the
4133 * size of each device.
4134 * If size is zero, we find the largest size that fits.
4135 */
4136 if (mddev->sync_thread)
4137 return -EBUSY;
4138 ITERATE_RDEV(mddev,rdev,tmp) {
4139 sector_t avail;
01ab5662
N		 4140 avail = rdev->size * 2;
4141
a35b0d69
N		 4142 if (fit && (size == 0 || size > avail/2))
4143 size = avail/2;
4144 if (avail < ((sector_t)size << 1))
4145 return -ENOSPC;
4146 }
4147 rv = mddev->pers->resize(mddev, (sector_t)size *2);
4148 if (!rv) {
4149 struct block_device *bdev;
4150
4151 bdev = bdget_disk(mddev->gendisk, 0);
4152 if (bdev) {
1b1dcc1b 4153 mutex_lock(&bdev->bd_inode->i_mutex);
6d89332b 4154 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
1b1dcc1b 4155 mutex_unlock(&bdev->bd_inode->i_mutex);
a35b0d69
N		 4156 bdput(bdev);
4157 }
4158 }
4159 return rv;
4160}
4161
da943b99
N		 4162static int update_raid_disks(mddev_t *mddev, int raid_disks)
4163{
4164 int rv;
4165 /* change the number of raid disks */
63c70c4f 4166 if (mddev->pers->check_reshape == NULL)
da943b99
N		 4167 return -EINVAL;
4168 if (raid_disks <= 0 ||
4169 raid_disks >= mddev->max_disks)
4170 return -EINVAL;
63c70c4f 4171 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
da943b99 4172 return -EBUSY;
63c70c4f
N		 4173 mddev->delta_disks = raid_disks - mddev->raid_disks;
4174
4175 rv = mddev->pers->check_reshape(mddev);
da943b99
N		 4176 return rv;
4177}
4178
4179
1da177e4
LT		 4180/*
4181 * update_array_info is used to change the configuration of an
4182 * on-line array.
4183 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4184 * fields in the info are checked against the array.
4185 * Any differences that cannot be handled will cause an error.
4186 * Normally, only one change can be managed at a time.
4187 */
4188static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4189{
4190 int rv = 0;
4191 int cnt = 0;
36fa3063
N		 4192 int state = 0;
4193
4194 /* calculate expected state,ignoring low bits */
4195 if (mddev->bitmap && mddev->bitmap_offset)
4196 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 4197
4198 if (mddev->major_version != info->major_version ||
4199 mddev->minor_version != info->minor_version ||
4200/* mddev->patch_version != info->patch_version || */
4201 mddev->ctime != info->ctime ||
4202 mddev->level != info->level ||
4203/* mddev->layout != info->layout || */
4204 !mddev->persistent != info->not_persistent||
36fa3063
N		 4205 mddev->chunk_size != info->chunk_size ||
4206 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4207 ((state^info->state) & 0xfffffe00)
4208 )
1da177e4
LT		 4209 return -EINVAL;
4210 /* Check there is only one change */
284ae7ca 4211 if (info->size >= 0 && mddev->size != info->size) cnt++;
1da177e4
LT		 4212 if (mddev->raid_disks != info->raid_disks) cnt++;
4213 if (mddev->layout != info->layout) cnt++;
36fa3063 4214 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 4215 if (cnt == 0) return 0;
4216 if (cnt > 1) return -EINVAL;
4217
4218 if (mddev->layout != info->layout) {
4219 /* Change layout
4220 * we don't need to do anything at the md level, the
4221 * personality will take care of it all.
4222 */
4223 if (mddev->pers->reconfig == NULL)
4224 return -EINVAL;
4225 else
4226 return mddev->pers->reconfig(mddev, info->layout, -1);
4227 }
284ae7ca 4228 if (info->size >= 0 && mddev->size != info->size)
a35b0d69
N		 4229 rv = update_size(mddev, info->size);
4230
da943b99
N		 4231 if (mddev->raid_disks != info->raid_disks)
4232 rv = update_raid_disks(mddev, info->raid_disks);
4233
36fa3063
N		 4234 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4235 if (mddev->pers->quiesce == NULL)
4236 return -EINVAL;
4237 if (mddev->recovery || mddev->sync_thread)
4238 return -EBUSY;
4239 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4240 /* add the bitmap */
4241 if (mddev->bitmap)
4242 return -EEXIST;
4243 if (mddev->default_bitmap_offset == 0)
4244 return -EINVAL;
4245 mddev->bitmap_offset = mddev->default_bitmap_offset;
4246 mddev->pers->quiesce(mddev, 1);
4247 rv = bitmap_create(mddev);
4248 if (rv)
4249 bitmap_destroy(mddev);
4250 mddev->pers->quiesce(mddev, 0);
4251 } else {
4252 /* remove the bitmap */
4253 if (!mddev->bitmap)
4254 return -ENOENT;
4255 if (mddev->bitmap->file)
4256 return -EINVAL;
4257 mddev->pers->quiesce(mddev, 1);
4258 bitmap_destroy(mddev);
4259 mddev->pers->quiesce(mddev, 0);
4260 mddev->bitmap_offset = 0;
4261 }
4262 }
850b2b42 4263 md_update_sb(mddev, 1);
1da177e4
LT		 4264 return rv;
4265}
4266
4267static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4268{
4269 mdk_rdev_t *rdev;
4270
4271 if (mddev->pers == NULL)
4272 return -ENODEV;
4273
4274 rdev = find_rdev(mddev, dev);
4275 if (!rdev)
4276 return -ENODEV;
4277
4278 md_error(mddev, rdev);
4279 return 0;
4280}
4281
a885c8c4
CH		 4282static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4283{
4284 mddev_t *mddev = bdev->bd_disk->private_data;
4285
4286 geo->heads = 2;
4287 geo->sectors = 4;
4288 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4289 return 0;
4290}
4291
1da177e4
LT		 4292static int md_ioctl(struct inode *inode, struct file *file,
4293 unsigned int cmd, unsigned long arg)
4294{
4295 int err = 0;
4296 void __user *argp = (void __user *)arg;
1da177e4
LT		 4297 mddev_t *mddev = NULL;
4298
4299 if (!capable(CAP_SYS_ADMIN))
4300 return -EACCES;
4301
4302 /*
4303 * Commands dealing with the RAID driver but not any
4304 * particular array:
4305 */
4306 switch (cmd)
4307 {
4308 case RAID_VERSION:
4309 err = get_version(argp);
4310 goto done;
4311
4312 case PRINT_RAID_DEBUG:
4313 err = 0;
4314 md_print_devices();
4315 goto done;
4316
4317#ifndef MODULE
4318 case RAID_AUTORUN:
4319 err = 0;
4320 autostart_arrays(arg);
4321 goto done;
4322#endif
4323 default:;
4324 }
4325
4326 /*
4327 * Commands creating/starting a new array:
4328 */
4329
4330 mddev = inode->i_bdev->bd_disk->private_data;
4331
4332 if (!mddev) {
4333 BUG();
4334 goto abort;
4335 }
4336
1da177e4
LT		 4337 err = mddev_lock(mddev);
4338 if (err) {
4339 printk(KERN_INFO
4340 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4341 err, cmd);
4342 goto abort;
4343 }
4344
4345 switch (cmd)
4346 {
4347 case SET_ARRAY_INFO:
4348 {
4349 mdu_array_info_t info;
4350 if (!arg)
4351 memset(&info, 0, sizeof(info));
4352 else if (copy_from_user(&info, argp, sizeof(info))) {
4353 err = -EFAULT;
4354 goto abort_unlock;
4355 }
4356 if (mddev->pers) {
4357 err = update_array_info(mddev, &info);
4358 if (err) {
4359 printk(KERN_WARNING "md: couldn't update"
4360 " array info. %d\n", err);
4361 goto abort_unlock;
4362 }
4363 goto done_unlock;
4364 }
4365 if (!list_empty(&mddev->disks)) {
4366 printk(KERN_WARNING
4367 "md: array %s already has disks!\n",
4368 mdname(mddev));
4369 err = -EBUSY;
4370 goto abort_unlock;
4371 }
4372 if (mddev->raid_disks) {
4373 printk(KERN_WARNING
4374 "md: array %s already initialised!\n",
4375 mdname(mddev));
4376 err = -EBUSY;
4377 goto abort_unlock;
4378 }
4379 err = set_array_info(mddev, &info);
4380 if (err) {
4381 printk(KERN_WARNING "md: couldn't set"
4382 " array info. %d\n", err);
4383 goto abort_unlock;
4384 }
4385 }
4386 goto done_unlock;
4387
4388 default:;
4389 }
4390
4391 /*
4392 * Commands querying/configuring an existing array:
4393 */
32a7627c 4394 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3f9d7b0d 4395 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
32a7627c 4396 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3f9d7b0d
N		 4397 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4398 && cmd != GET_BITMAP_FILE) {
1da177e4
LT		 4399 err = -ENODEV;
4400 goto abort_unlock;
4401 }
4402
4403 /*
4404 * Commands even a read-only array can execute:
4405 */
4406 switch (cmd)
4407 {
4408 case GET_ARRAY_INFO:
4409 err = get_array_info(mddev, argp);
4410 goto done_unlock;
4411
32a7627c 4412 case GET_BITMAP_FILE:
87162a28 4413 err = get_bitmap_file(mddev, argp);
32a7627c
N		 4414 goto done_unlock;
4415
1da177e4
LT		 4416 case GET_DISK_INFO:
4417 err = get_disk_info(mddev, argp);
4418 goto done_unlock;
4419
4420 case RESTART_ARRAY_RW:
4421 err = restart_array(mddev);
4422 goto done_unlock;
4423
4424 case STOP_ARRAY:
4425 err = do_md_stop (mddev, 0);
4426 goto done_unlock;
4427
4428 case STOP_ARRAY_RO:
4429 err = do_md_stop (mddev, 1);
4430 goto done_unlock;
4431
4432 /*
4433 * We have a problem here : there is no easy way to give a CHS
4434 * virtual geometry. We currently pretend that we have a 2 heads
4435 * 4 sectors (with a BIG number of cylinders...). This drives
4436 * dosfs just mad... ;-)
4437 */
1da177e4
LT		 4438 }
4439
4440 /*
4441 * The remaining ioctls are changing the state of the
f91de92e
N		 4442 * superblock, so we do not allow them on read-only arrays.
4443 * However non-MD ioctls (e.g. get-size) will still come through
4444 * here and hit the 'default' below, so only disallow
4445 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 4446 */
f91de92e
N		 4447 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4448 mddev->ro && mddev->pers) {
4449 if (mddev->ro == 2) {
4450 mddev->ro = 0;
4451 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4452 md_wakeup_thread(mddev->thread);
4453
4454 } else {
4455 err = -EROFS;
4456 goto abort_unlock;
4457 }
1da177e4
LT		 4458 }
4459
4460 switch (cmd)
4461 {
4462 case ADD_NEW_DISK:
4463 {
4464 mdu_disk_info_t info;
4465 if (copy_from_user(&info, argp, sizeof(info)))
4466 err = -EFAULT;
4467 else
4468 err = add_new_disk(mddev, &info);
4469 goto done_unlock;
4470 }
4471
4472 case HOT_REMOVE_DISK:
4473 err = hot_remove_disk(mddev, new_decode_dev(arg));
4474 goto done_unlock;
4475
4476 case HOT_ADD_DISK:
4477 err = hot_add_disk(mddev, new_decode_dev(arg));
4478 goto done_unlock;
4479
4480 case SET_DISK_FAULTY:
4481 err = set_disk_faulty(mddev, new_decode_dev(arg));
4482 goto done_unlock;
4483
4484 case RUN_ARRAY:
4485 err = do_md_run (mddev);
4486 goto done_unlock;
4487
32a7627c
N		 4488 case SET_BITMAP_FILE:
4489 err = set_bitmap_file(mddev, (int)arg);
4490 goto done_unlock;
4491
1da177e4 4492 default:
1da177e4
LT		 4493 err = -EINVAL;
4494 goto abort_unlock;
4495 }
4496
4497done_unlock:
4498abort_unlock:
4499 mddev_unlock(mddev);
4500
4501 return err;
4502done:
4503 if (err)
4504 MD_BUG();
4505abort:
4506 return err;
4507}
4508
4509static int md_open(struct inode *inode, struct file *file)
4510{
4511 /*
4512 * Succeed if we can lock the mddev, which confirms that
4513 * it isn't being stopped right now.
4514 */
4515 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4516 int err;
4517
d63a5a74 4518 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
1da177e4
LT		 4519 goto out;
4520
4521 err = 0;
4522 mddev_get(mddev);
4523 mddev_unlock(mddev);
4524
4525 check_disk_change(inode->i_bdev);
4526 out:
4527 return err;
4528}
4529
4530static int md_release(struct inode *inode, struct file * file)
4531{
4532 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4533
52e5f9d1 4534 BUG_ON(!mddev);
1da177e4
LT		 4535 mddev_put(mddev);
4536
4537 return 0;
4538}
4539
4540static int md_media_changed(struct gendisk *disk)
4541{
4542 mddev_t *mddev = disk->private_data;
4543
4544 return mddev->changed;
4545}
4546
4547static int md_revalidate(struct gendisk *disk)
4548{
4549 mddev_t *mddev = disk->private_data;
4550
4551 mddev->changed = 0;
4552 return 0;
4553}
4554static struct block_device_operations md_fops =
4555{
4556 .owner = THIS_MODULE,
4557 .open = md_open,
4558 .release = md_release,
4559 .ioctl = md_ioctl,
a885c8c4 4560 .getgeo = md_getgeo,
1da177e4
LT		 4561 .media_changed = md_media_changed,
4562 .revalidate_disk= md_revalidate,
4563};
4564
75c96f85 4565static int md_thread(void * arg)
1da177e4
LT		 4566{
4567 mdk_thread_t *thread = arg;
4568
1da177e4
LT		 4569 /*
4570 * md_thread is a 'system-thread', it's priority should be very
4571 * high. We avoid resource deadlocks individually in each
4572 * raid personality. (RAID5 does preallocation) We also use RR and
4573 * the very same RT priority as kswapd, thus we will never get
4574 * into a priority inversion deadlock.
4575 *
4576 * we definitely have to have equal or higher priority than
4577 * bdflush, otherwise bdflush will deadlock if there are too
4578 * many dirty RAID5 blocks.
4579 */
1da177e4 4580
4b438a23 4581 current->flags |= PF_NOFREEZE;
6985c43f 4582 allow_signal(SIGKILL);
a6fb0934 4583 while (!kthread_should_stop()) {
1da177e4 4584
93588e22
N		 4585 /* We need to wait INTERRUPTIBLE so that
4586 * we don't add to the load-average.
4587 * That means we need to be sure no signals are
4588 * pending
4589 */
4590 if (signal_pending(current))
4591 flush_signals(current);
4592
4593 wait_event_interruptible_timeout
4594 (thread->wqueue,
4595 test_bit(THREAD_WAKEUP, &thread->flags)
4596 || kthread_should_stop(),
4597 thread->timeout);
1da177e4
LT		 4598
4599 clear_bit(THREAD_WAKEUP, &thread->flags);
4600
787453c2 4601 thread->run(thread->mddev);
1da177e4 4602 }
a6fb0934 4603
1da177e4
LT		 4604 return 0;
4605}
4606
4607void md_wakeup_thread(mdk_thread_t *thread)
4608{
4609 if (thread) {
4610 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4611 set_bit(THREAD_WAKEUP, &thread->flags);
4612 wake_up(&thread->wqueue);
4613 }
4614}
4615
4616mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4617 const char *name)
4618{
4619 mdk_thread_t *thread;
1da177e4 4620
9ffae0cf 4621 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 4622 if (!thread)
4623 return NULL;
4624
1da177e4
LT		 4625 init_waitqueue_head(&thread->wqueue);
4626
1da177e4
LT		 4627 thread->run = run;
4628 thread->mddev = mddev;
32a7627c 4629 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 4630 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 4631 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 4632 kfree(thread);
4633 return NULL;
4634 }
1da177e4
LT		 4635 return thread;
4636}
4637
1da177e4
LT		 4638void md_unregister_thread(mdk_thread_t *thread)
4639{
d28446fe 4640 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
a6fb0934
N		 4641
4642 kthread_stop(thread->tsk);
1da177e4
LT		 4643 kfree(thread);
4644}
4645
4646void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4647{
4648 if (!mddev) {
4649 MD_BUG();
4650 return;
4651 }
4652
b2d444d7 4653 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 4654 return;
32a7627c 4655/*
1da177e4
LT		 4656 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4657 mdname(mddev),
4658 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4659 __builtin_return_address(0),__builtin_return_address(1),
4660 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 4661*/
d0a0a5ee
AM		 4662 if (!mddev->pers)
4663 return;
1da177e4
LT		 4664 if (!mddev->pers->error_handler)
4665 return;
4666 mddev->pers->error_handler(mddev,rdev);
4667 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4668 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4669 md_wakeup_thread(mddev->thread);
c331eb04 4670 md_new_event_inintr(mddev);
1da177e4
LT		 4671}
4672
4673/* seq_file implementation /proc/mdstat */
4674
4675static void status_unused(struct seq_file *seq)
4676{
4677 int i = 0;
4678 mdk_rdev_t *rdev;
4679 struct list_head *tmp;
4680
4681 seq_printf(seq, "unused devices: ");
4682
4683 ITERATE_RDEV_PENDING(rdev,tmp) {
4684 char b[BDEVNAME_SIZE];
4685 i++;
4686 seq_printf(seq, "%s ",
4687 bdevname(rdev->bdev,b));
4688 }
4689 if (!i)
4690 seq_printf(seq, "<none>");
4691
4692 seq_printf(seq, "\n");
4693}
4694
4695
4696static void status_resync(struct seq_file *seq, mddev_t * mddev)
4697{
4588b42e
N		 4698 sector_t max_blocks, resync, res;
4699 unsigned long dt, db, rt;
4700 int scale;
4701 unsigned int per_milli;
1da177e4
LT		 4702
4703 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4704
4705 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4706 max_blocks = mddev->resync_max_sectors >> 1;
4707 else
4708 max_blocks = mddev->size;
4709
4710 /*
4711 * Should not happen.
4712 */
4713 if (!max_blocks) {
4714 MD_BUG();
4715 return;
4716 }
4588b42e
N		 4717 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4718 * in a sector_t, and (max_blocks>>scale) will fit in a
4719 * u32, as those are the requirements for sector_div.
4720 * Thus 'scale' must be at least 10
4721 */
4722 scale = 10;
4723 if (sizeof(sector_t) > sizeof(unsigned long)) {
4724 while ( max_blocks/2 > (1ULL<<(scale+32)))
4725 scale++;
4726 }
4727 res = (resync>>scale)*1000;
4728 sector_div(res, (u32)((max_blocks>>scale)+1));
4729
4730 per_milli = res;
1da177e4 4731 {
4588b42e 4732 int i, x = per_milli/50, y = 20-x;
1da177e4
LT		 4733 seq_printf(seq, "[");
4734 for (i = 0; i < x; i++)
4735 seq_printf(seq, "=");
4736 seq_printf(seq, ">");
4737 for (i = 0; i < y; i++)
4738 seq_printf(seq, ".");
4739 seq_printf(seq, "] ");
4740 }
4588b42e 4741 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
ccfcc3c1
N		 4742 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
4743 "reshape" :
61df9d91
N		 4744 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
4745 "check" :
4746 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4747 "resync" : "recovery"))),
4748 per_milli/10, per_milli % 10,
4588b42e
N		 4749 (unsigned long long) resync,
4750 (unsigned long long) max_blocks);
1da177e4
LT		 4751
4752 /*
4753 * We do not want to overflow, so the order of operands and
4754 * the * 100 / 100 trick are important. We do a +1 to be
4755 * safe against division by zero. We only estimate anyway.
4756 *
4757 * dt: time from mark until now
4758 * db: blocks written from mark until now
4759 * rt: remaining time
4760 */
4761 dt = ((jiffies - mddev->resync_mark) / HZ);
4762 if (!dt) dt++;
ff4e8d9a
N		 4763 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
4764 - mddev->resync_mark_cnt;
4765 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
1da177e4
LT		 4766
4767 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4768
ff4e8d9a 4769 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
1da177e4
LT		 4770}
4771
4772static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4773{
4774 struct list_head *tmp;
4775 loff_t l = *pos;
4776 mddev_t *mddev;
4777
4778 if (l >= 0x10000)
4779 return NULL;
4780 if (!l--)
4781 /* header */
4782 return (void*)1;
4783
4784 spin_lock(&all_mddevs_lock);
4785 list_for_each(tmp,&all_mddevs)
4786 if (!l--) {
4787 mddev = list_entry(tmp, mddev_t, all_mddevs);
4788 mddev_get(mddev);
4789 spin_unlock(&all_mddevs_lock);
4790 return mddev;
4791 }
4792 spin_unlock(&all_mddevs_lock);
4793 if (!l--)
4794 return (void*)2;/* tail */
4795 return NULL;
4796}
4797
4798static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4799{
4800 struct list_head *tmp;
4801 mddev_t *next_mddev, *mddev = v;
4802
4803 ++*pos;
4804 if (v == (void*)2)
4805 return NULL;
4806
4807 spin_lock(&all_mddevs_lock);
4808 if (v == (void*)1)
4809 tmp = all_mddevs.next;
4810 else
4811 tmp = mddev->all_mddevs.next;
4812 if (tmp != &all_mddevs)
4813 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4814 else {
4815 next_mddev = (void*)2;
4816 *pos = 0x10000;
4817 }
4818 spin_unlock(&all_mddevs_lock);
4819
4820 if (v != (void*)1)
4821 mddev_put(mddev);
4822 return next_mddev;
4823
4824}
4825
4826static void md_seq_stop(struct seq_file *seq, void *v)
4827{
4828 mddev_t *mddev = v;
4829
4830 if (mddev && v != (void*)1 && v != (void*)2)
4831 mddev_put(mddev);
4832}
4833
d7603b7e
N		 4834struct mdstat_info {
4835 int event;
4836};
4837
1da177e4
LT		 4838static int md_seq_show(struct seq_file *seq, void *v)
4839{
4840 mddev_t *mddev = v;
4841 sector_t size;
4842 struct list_head *tmp2;
4843 mdk_rdev_t *rdev;
d7603b7e 4844 struct mdstat_info *mi = seq->private;
32a7627c 4845 struct bitmap *bitmap;
1da177e4
LT		 4846
4847 if (v == (void*)1) {
2604b703 4848 struct mdk_personality *pers;
1da177e4
LT		 4849 seq_printf(seq, "Personalities : ");
4850 spin_lock(&pers_lock);
2604b703
N		 4851 list_for_each_entry(pers, &pers_list, list)
4852 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT		 4853
4854 spin_unlock(&pers_lock);
4855 seq_printf(seq, "\n");
d7603b7e 4856 mi->event = atomic_read(&md_event_count);
1da177e4
LT		 4857 return 0;
4858 }
4859 if (v == (void*)2) {
4860 status_unused(seq);
4861 return 0;
4862 }
4863
5dc5cf7d 4864 if (mddev_lock(mddev) < 0)
1da177e4 4865 return -EINTR;
5dc5cf7d 4866
1da177e4
LT		 4867 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4868 seq_printf(seq, "%s : %sactive", mdname(mddev),
4869 mddev->pers ? "" : "in");
4870 if (mddev->pers) {
f91de92e 4871 if (mddev->ro==1)
1da177e4 4872 seq_printf(seq, " (read-only)");
f91de92e
N		 4873 if (mddev->ro==2)
4874 seq_printf(seq, "(auto-read-only)");
1da177e4
LT		 4875 seq_printf(seq, " %s", mddev->pers->name);
4876 }
4877
4878 size = 0;
4879 ITERATE_RDEV(mddev,rdev,tmp2) {
4880 char b[BDEVNAME_SIZE];
4881 seq_printf(seq, " %s[%d]",
4882 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 4883 if (test_bit(WriteMostly, &rdev->flags))
4884 seq_printf(seq, "(W)");
b2d444d7 4885 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4886 seq_printf(seq, "(F)");
4887 continue;
b325a32e
N		 4888 } else if (rdev->raid_disk < 0)
4889 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 4890 size += rdev->size;
4891 }
4892
4893 if (!list_empty(&mddev->disks)) {
4894 if (mddev->pers)
4895 seq_printf(seq, "\n %llu blocks",
4896 (unsigned long long)mddev->array_size);
4897 else
4898 seq_printf(seq, "\n %llu blocks",
4899 (unsigned long long)size);
4900 }
1cd6bf19
N		 4901 if (mddev->persistent) {
4902 if (mddev->major_version != 0 ||
4903 mddev->minor_version != 90) {
4904 seq_printf(seq," super %d.%d",
4905 mddev->major_version,
4906 mddev->minor_version);
4907 }
4908 } else
4909 seq_printf(seq, " super non-persistent");
1da177e4
LT		 4910
4911 if (mddev->pers) {
4912 mddev->pers->status (seq, mddev);
4913 seq_printf(seq, "\n ");
8e1b39d6
N		 4914 if (mddev->pers->sync_request) {
4915 if (mddev->curr_resync > 2) {
4916 status_resync (seq, mddev);
4917 seq_printf(seq, "\n ");
4918 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4919 seq_printf(seq, "\tresync=DELAYED\n ");
4920 else if (mddev->recovery_cp < MaxSector)
4921 seq_printf(seq, "\tresync=PENDING\n ");
4922 }
32a7627c
N		 4923 } else
4924 seq_printf(seq, "\n ");
4925
4926 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 4927 unsigned long chunk_kb;
4928 unsigned long flags;
32a7627c
N		 4929 spin_lock_irqsave(&bitmap->lock, flags);
4930 chunk_kb = bitmap->chunksize >> 10;
4931 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
4932 "%lu%s chunk",
4933 bitmap->pages - bitmap->missing_pages,
4934 bitmap->pages,
4935 (bitmap->pages - bitmap->missing_pages)
4936 << (PAGE_SHIFT - 10),
4937 chunk_kb ? chunk_kb : bitmap->chunksize,
4938 chunk_kb ? "KB" : "B");
78d742d8
N		 4939 if (bitmap->file) {
4940 seq_printf(seq, ", file: ");
c649bb9c
JS		 4941 seq_path(seq, bitmap->file->f_path.mnt,
4942 bitmap->file->f_path.dentry," \t\n");
32a7627c 4943 }
78d742d8 4944
32a7627c
N		 4945 seq_printf(seq, "\n");
4946 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 4947 }
4948
4949 seq_printf(seq, "\n");
4950 }
4951 mddev_unlock(mddev);
4952
4953 return 0;
4954}
4955
4956static struct seq_operations md_seq_ops = {
4957 .start = md_seq_start,
4958 .next = md_seq_next,
4959 .stop = md_seq_stop,
4960 .show = md_seq_show,
4961};
4962
4963static int md_seq_open(struct inode *inode, struct file *file)
4964{
4965 int error;
d7603b7e
N		 4966 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
4967 if (mi == NULL)
4968 return -ENOMEM;
1da177e4
LT		 4969
4970 error = seq_open(file, &md_seq_ops);
d7603b7e
N		 4971 if (error)
4972 kfree(mi);
4973 else {
4974 struct seq_file *p = file->private_data;
4975 p->private = mi;
4976 mi->event = atomic_read(&md_event_count);
4977 }
1da177e4
LT		 4978 return error;
4979}
4980
d7603b7e
N		 4981static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
4982{
4983 struct seq_file *m = filp->private_data;
4984 struct mdstat_info *mi = m->private;
4985 int mask;
4986
4987 poll_wait(filp, &md_event_waiters, wait);
4988
4989 /* always allow read */
4990 mask = POLLIN | POLLRDNORM;
4991
4992 if (mi->event != atomic_read(&md_event_count))
4993 mask |= POLLERR | POLLPRI;
4994 return mask;
4995}
4996
fa027c2a 4997static const struct file_operations md_seq_fops = {
e24650c2 4998 .owner = THIS_MODULE,
1da177e4
LT		 4999 .open = md_seq_open,
5000 .read = seq_read,
5001 .llseek = seq_lseek,
c3f94b40 5002 .release = seq_release_private,
d7603b7e 5003 .poll = mdstat_poll,
1da177e4
LT		 5004};
5005
2604b703 5006int register_md_personality(struct mdk_personality *p)
1da177e4 5007{
1da177e4 5008 spin_lock(&pers_lock);
2604b703
N		 5009 list_add_tail(&p->list, &pers_list);
5010 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
1da177e4
LT		 5011 spin_unlock(&pers_lock);
5012 return 0;
5013}
5014
2604b703 5015int unregister_md_personality(struct mdk_personality *p)
1da177e4 5016{
2604b703 5017 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 5018 spin_lock(&pers_lock);
2604b703 5019 list_del_init(&p->list);
1da177e4
LT		 5020 spin_unlock(&pers_lock);
5021 return 0;
5022}
5023
5024static int is_mddev_idle(mddev_t *mddev)
5025{
5026 mdk_rdev_t * rdev;
5027 struct list_head *tmp;
5028 int idle;
5029 unsigned long curr_events;
5030
5031 idle = 1;
5032 ITERATE_RDEV(mddev,rdev,tmp) {
5033 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 5034 curr_events = disk_stat_read(disk, sectors[0]) +
5035 disk_stat_read(disk, sectors[1]) -
1da177e4 5036 atomic_read(&disk->sync_io);
c0e48521
N		 5037 /* The difference between curr_events and last_events
5038 * will be affected by any new non-sync IO (making
5039 * curr_events bigger) and any difference in the amount of
5040 * in-flight syncio (making current_events bigger or smaller)
5041 * The amount in-flight is currently limited to
5042 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
5043 * which is at most 4096 sectors.
5044 * These numbers are fairly fragile and should be made
5045 * more robust, probably by enforcing the
5046 * 'window size' that md_do_sync sort-of uses.
5047 *
1da177e4
LT		 5048 * Note: the following is an unsigned comparison.
5049 */
c0e48521 5050 if ((curr_events - rdev->last_events + 4096) > 8192) {
1da177e4
LT		 5051 rdev->last_events = curr_events;
5052 idle = 0;
5053 }
5054 }
5055 return idle;
5056}
5057
5058void md_done_sync(mddev_t *mddev, int blocks, int ok)
5059{
5060 /* another "blocks" (512byte) blocks have been synced */
5061 atomic_sub(blocks, &mddev->recovery_active);
5062 wake_up(&mddev->recovery_wait);
5063 if (!ok) {
5064 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5065 md_wakeup_thread(mddev->thread);
5066 // stop recovery, signal do_sync ....
5067 }
5068}
5069
5070
06d91a5f
N		 5071/* md_write_start(mddev, bi)
5072 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 5073 * in superblock) before writing, schedule a superblock update
5074 * and wait for it to complete.
06d91a5f 5075 */
3d310eb7 5076void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 5077{
06d91a5f 5078 if (bio_data_dir(bi) != WRITE)
3d310eb7 5079 return;
06d91a5f 5080
f91de92e
N		 5081 BUG_ON(mddev->ro == 1);
5082 if (mddev->ro == 2) {
5083 /* need to switch to read/write */
5084 mddev->ro = 0;
5085 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5086 md_wakeup_thread(mddev->thread);
5087 }
06d91a5f 5088 atomic_inc(&mddev->writes_pending);
06d91a5f 5089 if (mddev->in_sync) {
a9701a30 5090 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 5091 if (mddev->in_sync) {
5092 mddev->in_sync = 0;
850b2b42 5093 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3d310eb7
N		 5094 md_wakeup_thread(mddev->thread);
5095 }
a9701a30 5096 spin_unlock_irq(&mddev->write_lock);
06d91a5f 5097 }
850b2b42 5098 wait_event(mddev->sb_wait, mddev->flags==0);
1da177e4
LT		 5099}
5100
5101void md_write_end(mddev_t *mddev)
5102{
5103 if (atomic_dec_and_test(&mddev->writes_pending)) {
5104 if (mddev->safemode == 2)
5105 md_wakeup_thread(mddev->thread);
16f17b39 5106 else if (mddev->safemode_delay)
1da177e4
LT		 5107 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5108 }
5109}
5110
2a2275d6
N		 5111/* md_allow_write(mddev)
5112 * Calling this ensures that the array is marked 'active' so that writes
5113 * may proceed without blocking. It is important to call this before
5114 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5115 * Must be called with mddev_lock held.
5116 */
5117void md_allow_write(mddev_t *mddev)
5118{
5119 if (!mddev->pers)
5120 return;
5121 if (mddev->ro)
5122 return;
5123
5124 spin_lock_irq(&mddev->write_lock);
5125 if (mddev->in_sync) {
5126 mddev->in_sync = 0;
5127 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5128 if (mddev->safemode_delay &&
5129 mddev->safemode == 0)
5130 mddev->safemode = 1;
5131 spin_unlock_irq(&mddev->write_lock);
5132 md_update_sb(mddev, 0);
5133 } else
5134 spin_unlock_irq(&mddev->write_lock);
5135}
5136EXPORT_SYMBOL_GPL(md_allow_write);
5137
75c96f85 5138static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
1da177e4
LT		 5139
5140#define SYNC_MARKS 10
5141#define SYNC_MARK_STEP (3*HZ)
29269553 5142void md_do_sync(mddev_t *mddev)
1da177e4
LT		 5143{
5144 mddev_t *mddev2;
5145 unsigned int currspeed = 0,
5146 window;
57afd89f 5147 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 5148 unsigned long mark[SYNC_MARKS];
5149 sector_t mark_cnt[SYNC_MARKS];
5150 int last_mark,m;
5151 struct list_head *tmp;
5152 sector_t last_check;
57afd89f 5153 int skipped = 0;
5fd6c1dc
N		 5154 struct list_head *rtmp;
5155 mdk_rdev_t *rdev;
61df9d91 5156 char *desc;
1da177e4
LT		 5157
5158 /* just incase thread restarts... */
5159 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5160 return;
5fd6c1dc
N		 5161 if (mddev->ro) /* never try to sync a read-only array */
5162 return;
1da177e4 5163
61df9d91
N		 5164 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5165 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5166 desc = "data-check";
5167 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5168 desc = "requested-resync";
5169 else
5170 desc = "resync";
5171 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5172 desc = "reshape";
5173 else
5174 desc = "recovery";
5175
1da177e4
LT		 5176 /* we overload curr_resync somewhat here.
5177 * 0 == not engaged in resync at all
5178 * 2 == checking that there is no conflict with another sync
5179 * 1 == like 2, but have yielded to allow conflicting resync to
5180 * commense
5181 * other == active in resync - this many blocks
5182 *
5183 * Before starting a resync we must have set curr_resync to
5184 * 2, and then checked that every "conflicting" array has curr_resync
5185 * less than ours. When we find one that is the same or higher
5186 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5187 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5188 * This will mean we have to start checking from the beginning again.
5189 *
5190 */
5191
5192 do {
5193 mddev->curr_resync = 2;
5194
5195 try_again:
787453c2 5196 if (kthread_should_stop()) {
6985c43f 5197 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 5198 goto skip;
5199 }
5200 ITERATE_MDDEV(mddev2,tmp) {
1da177e4
LT		 5201 if (mddev2 == mddev)
5202 continue;
5203 if (mddev2->curr_resync &&
5204 match_mddev_units(mddev,mddev2)) {
5205 DEFINE_WAIT(wq);
5206 if (mddev < mddev2 && mddev->curr_resync == 2) {
5207 /* arbitrarily yield */
5208 mddev->curr_resync = 1;
5209 wake_up(&resync_wait);
5210 }
5211 if (mddev > mddev2 && mddev->curr_resync == 1)
5212 /* no need to wait here, we can wait the next
5213 * time 'round when curr_resync == 2
5214 */
5215 continue;
787453c2
N		 5216 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5217 if (!kthread_should_stop() &&
8712e553 5218 mddev2->curr_resync >= mddev->curr_resync) {
61df9d91
N		 5219 printk(KERN_INFO "md: delaying %s of %s"
5220 " until %s has finished (they"
1da177e4 5221 " share one or more physical units)\n",
61df9d91 5222 desc, mdname(mddev), mdname(mddev2));
1da177e4
LT		 5223 mddev_put(mddev2);
5224 schedule();
5225 finish_wait(&resync_wait, &wq);
5226 goto try_again;
5227 }
5228 finish_wait(&resync_wait, &wq);
5229 }
5230 }
5231 } while (mddev->curr_resync < 2);
5232
5fd6c1dc 5233 j = 0;
9d88883e 5234 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 5235 /* resync follows the size requested by the personality,
57afd89f 5236 * which defaults to physical size, but can be virtual size
1da177e4
LT		 5237 */
5238 max_sectors = mddev->resync_max_sectors;
9d88883e 5239 mddev->resync_mismatches = 0;
5fd6c1dc
N		 5240 /* we don't use the checkpoint if there's a bitmap */
5241 if (!mddev->bitmap &&
5242 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5243 j = mddev->recovery_cp;
ccfcc3c1
N		 5244 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5245 max_sectors = mddev->size << 1;
5fd6c1dc 5246 else {
1da177e4
LT		 5247 /* recovery follows the physical size of devices */
5248 max_sectors = mddev->size << 1;
5fd6c1dc
N		 5249 j = MaxSector;
5250 ITERATE_RDEV(mddev,rdev,rtmp)
5251 if (rdev->raid_disk >= 0 &&
5252 !test_bit(Faulty, &rdev->flags) &&
5253 !test_bit(In_sync, &rdev->flags) &&
5254 rdev->recovery_offset < j)
5255 j = rdev->recovery_offset;
5256 }
1da177e4 5257
61df9d91
N		 5258 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5259 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5260 " %d KB/sec/disk.\n", speed_min(mddev));
338cec32 5261 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
61df9d91
N		 5262 "(but not more than %d KB/sec) for %s.\n",
5263 speed_max(mddev), desc);
1da177e4
LT		 5264
5265 is_mddev_idle(mddev); /* this also initializes IO event counters */
5fd6c1dc 5266
57afd89f 5267 io_sectors = 0;
1da177e4
LT		 5268 for (m = 0; m < SYNC_MARKS; m++) {
5269 mark[m] = jiffies;
57afd89f 5270 mark_cnt[m] = io_sectors;
1da177e4
LT		 5271 }
5272 last_mark = 0;
5273 mddev->resync_mark = mark[last_mark];
5274 mddev->resync_mark_cnt = mark_cnt[last_mark];
5275
5276 /*
5277 * Tune reconstruction:
5278 */
5279 window = 32*(PAGE_SIZE/512);
5280 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5281 window/2,(unsigned long long) max_sectors/2);
5282
5283 atomic_set(&mddev->recovery_active, 0);
5284 init_waitqueue_head(&mddev->recovery_wait);
5285 last_check = 0;
5286
5287 if (j>2) {
5288 printk(KERN_INFO
61df9d91
N		 5289 "md: resuming %s of %s from checkpoint.\n",
5290 desc, mdname(mddev));
1da177e4
LT		 5291 mddev->curr_resync = j;
5292 }
5293
5294 while (j < max_sectors) {
57afd89f 5295 sector_t sectors;
1da177e4 5296
57afd89f
N		 5297 skipped = 0;
5298 sectors = mddev->pers->sync_request(mddev, j, &skipped,
88202a0c 5299 currspeed < speed_min(mddev));
57afd89f 5300 if (sectors == 0) {
1da177e4
LT		 5301 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5302 goto out;
5303 }
57afd89f
N		 5304
5305 if (!skipped) { /* actual IO requested */
5306 io_sectors += sectors;
5307 atomic_add(sectors, &mddev->recovery_active);
5308 }
5309
1da177e4
LT		 5310 j += sectors;
5311 if (j>1) mddev->curr_resync = j;
ff4e8d9a 5312 mddev->curr_mark_cnt = io_sectors;
d7603b7e
N		 5313 if (last_check == 0)
5314 /* this is the earliers that rebuilt will be
5315 * visible in /proc/mdstat
5316 */
5317 md_new_event(mddev);
57afd89f
N		 5318
5319 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 5320 continue;
5321
57afd89f 5322 last_check = io_sectors;
1da177e4
LT		 5323
5324 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
5325 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
5326 break;
5327
5328 repeat:
5329 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5330 /* step marks */
5331 int next = (last_mark+1) % SYNC_MARKS;
5332
5333 mddev->resync_mark = mark[next];
5334 mddev->resync_mark_cnt = mark_cnt[next];
5335 mark[next] = jiffies;
57afd89f 5336 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 5337 last_mark = next;
5338 }
5339
5340
787453c2 5341 if (kthread_should_stop()) {
1da177e4
LT		 5342 /*
5343 * got a signal, exit.
5344 */
5345 printk(KERN_INFO
5346 "md: md_do_sync() got signal ... exiting\n");
1da177e4
LT		 5347 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5348 goto out;
5349 }
5350
5351 /*
5352 * this loop exits only if either when we are slower than
5353 * the 'hard' speed limit, or the system was IO-idle for
5354 * a jiffy.
5355 * the system might be non-idle CPU-wise, but we only care
5356 * about not overloading the IO subsystem. (things like an
5357 * e2fsck being done on the RAID array should execute fast)
5358 */
5359 mddev->queue->unplug_fn(mddev->queue);
5360 cond_resched();
5361
57afd89f
N		 5362 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5363 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4 5364
88202a0c
N		 5365 if (currspeed > speed_min(mddev)) {
5366 if ((currspeed > speed_max(mddev)) ||
1da177e4 5367 !is_mddev_idle(mddev)) {
c0e48521 5368 msleep(500);
1da177e4
LT		 5369 goto repeat;
5370 }
5371 }
5372 }
61df9d91 5373 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
1da177e4
LT		 5374 /*
5375 * this also signals 'finished resyncing' to md_stop
5376 */
5377 out:
5378 mddev->queue->unplug_fn(mddev->queue);
5379
5380 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5381
5382 /* tell personality that we are finished */
57afd89f 5383 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 5384
5385 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
ccfcc3c1 5386 !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5fd6c1dc
N		 5387 mddev->curr_resync > 2) {
5388 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5389 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5390 if (mddev->curr_resync >= mddev->recovery_cp) {
5391 printk(KERN_INFO
61df9d91
N		 5392 "md: checkpointing %s of %s.\n",
5393 desc, mdname(mddev));
5fd6c1dc
N		 5394 mddev->recovery_cp = mddev->curr_resync;
5395 }
5396 } else
5397 mddev->recovery_cp = MaxSector;
5398 } else {
5399 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5400 mddev->curr_resync = MaxSector;
5401 ITERATE_RDEV(mddev,rdev,rtmp)
5402 if (rdev->raid_disk >= 0 &&
5403 !test_bit(Faulty, &rdev->flags) &&
5404 !test_bit(In_sync, &rdev->flags) &&
5405 rdev->recovery_offset < mddev->curr_resync)
5406 rdev->recovery_offset = mddev->curr_resync;
5fd6c1dc 5407 }
1da177e4 5408 }
17571284 5409 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 5410
1da177e4
LT		 5411 skip:
5412 mddev->curr_resync = 0;
5413 wake_up(&resync_wait);
5414 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5415 md_wakeup_thread(mddev->thread);
5416}
29269553 5417EXPORT_SYMBOL_GPL(md_do_sync);
1da177e4
LT		 5418
5419
b4c4c7b8
N		 5420static int remove_and_add_spares(mddev_t *mddev)
5421{
5422 mdk_rdev_t *rdev;
5423 struct list_head *rtmp;
5424 int spares = 0;
5425
5426 ITERATE_RDEV(mddev,rdev,rtmp)
5427 if (rdev->raid_disk >= 0 &&
5428 (test_bit(Faulty, &rdev->flags) ||
5429 ! test_bit(In_sync, &rdev->flags)) &&
5430 atomic_read(&rdev->nr_pending)==0) {
5431 if (mddev->pers->hot_remove_disk(
5432 mddev, rdev->raid_disk)==0) {
5433 char nm[20];
5434 sprintf(nm,"rd%d", rdev->raid_disk);
5435 sysfs_remove_link(&mddev->kobj, nm);
5436 rdev->raid_disk = -1;
5437 }
5438 }
5439
5440 if (mddev->degraded) {
5441 ITERATE_RDEV(mddev,rdev,rtmp)
5442 if (rdev->raid_disk < 0
5443 && !test_bit(Faulty, &rdev->flags)) {
5444 rdev->recovery_offset = 0;
5445 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5446 char nm[20];
5447 sprintf(nm, "rd%d", rdev->raid_disk);
5e55e2f5
N		 5448 if (sysfs_create_link(&mddev->kobj,
5449 &rdev->kobj, nm))
5450 printk(KERN_WARNING
5451 "md: cannot register "
5452 "%s for %s\n",
5453 nm, mdname(mddev));
b4c4c7b8
N		 5454 spares++;
5455 md_new_event(mddev);
5456 } else
5457 break;
5458 }
5459 }
5460 return spares;
5461}
1da177e4
LT		 5462/*
5463 * This routine is regularly called by all per-raid-array threads to
5464 * deal with generic issues like resync and super-block update.
5465 * Raid personalities that don't have a thread (linear/raid0) do not
5466 * need this as they never do any recovery or update the superblock.
5467 *
5468 * It does not do any resync itself, but rather "forks" off other threads
5469 * to do that as needed.
5470 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5471 * "->recovery" and create a thread at ->sync_thread.
5472 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5473 * and wakeups up this thread which will reap the thread and finish up.
5474 * This thread also removes any faulty devices (with nr_pending == 0).
5475 *
5476 * The overall approach is:
5477 * 1/ if the superblock needs updating, update it.
5478 * 2/ If a recovery thread is running, don't do anything else.
5479 * 3/ If recovery has finished, clean up, possibly marking spares active.
5480 * 4/ If there are any faulty devices, remove them.
5481 * 5/ If array is degraded, try to add spares devices
5482 * 6/ If array has spares or is not in-sync, start a resync thread.
5483 */
5484void md_check_recovery(mddev_t *mddev)
5485{
5486 mdk_rdev_t *rdev;
5487 struct list_head *rtmp;
5488
5489
5f40402d
N		 5490 if (mddev->bitmap)
5491 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 5492
5493 if (mddev->ro)
5494 return;
fca4d848
N		 5495
5496 if (signal_pending(current)) {
5497 if (mddev->pers->sync_request) {
5498 printk(KERN_INFO "md: %s in immediate safe mode\n",
5499 mdname(mddev));
5500 mddev->safemode = 2;
5501 }
5502 flush_signals(current);
5503 }
5504
1da177e4 5505 if ( ! (
850b2b42 5506 mddev->flags ||
1da177e4 5507 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848
N		 5508 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
5509 (mddev->safemode == 1) ||
5510 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5511 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 5512 ))
5513 return;
fca4d848 5514
df5b89b3 5515 if (mddev_trylock(mddev)) {
b4c4c7b8 5516 int spares = 0;
fca4d848 5517
a9701a30 5518 spin_lock_irq(&mddev->write_lock);
fca4d848
N		 5519 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
5520 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
5521 mddev->in_sync = 1;
850b2b42 5522 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
fca4d848
N		 5523 }
5524 if (mddev->safemode == 1)
5525 mddev->safemode = 0;
a9701a30 5526 spin_unlock_irq(&mddev->write_lock);
fca4d848 5527
850b2b42
N		 5528 if (mddev->flags)
5529 md_update_sb(mddev, 0);
06d91a5f 5530
06d91a5f 5531
1da177e4
LT		 5532 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
5533 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
5534 /* resync/recovery still happening */
5535 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5536 goto unlock;
5537 }
5538 if (mddev->sync_thread) {
5539 /* resync has finished, collect result */
5540 md_unregister_thread(mddev->sync_thread);
5541 mddev->sync_thread = NULL;
5542 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5543 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5544 /* success...*/
5545 /* activate any spares */
5546 mddev->pers->spare_active(mddev);
5547 }
850b2b42 5548 md_update_sb(mddev, 1);
41158c7e
N		 5549
5550 /* if array is no-longer degraded, then any saved_raid_disk
5551 * information must be scrapped
5552 */
5553 if (!mddev->degraded)
5554 ITERATE_RDEV(mddev,rdev,rtmp)
5555 rdev->saved_raid_disk = -1;
5556
1da177e4
LT		 5557 mddev->recovery = 0;
5558 /* flag recovery needed just to double check */
5559 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
d7603b7e 5560 md_new_event(mddev);
1da177e4
LT		 5561 goto unlock;
5562 }
24dd469d
N		 5563 /* Clear some bits that don't mean anything, but
5564 * might be left set
5565 */
5566 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5567 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
5568 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
5569 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4 5570
5fd6c1dc
N		 5571 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5572 goto unlock;
1da177e4
LT		 5573 /* no recovery is running.
5574 * remove any failed drives, then
5575 * add spares if possible.
5576 * Spare are also removed and re-added, to allow
5577 * the personality to fail the re-add.
5578 */
1da177e4 5579
b4c4c7b8
N		 5580 if (mddev->reshape_position != MaxSector) {
5581 if (mddev->pers->check_reshape(mddev) != 0)
5582 /* Cannot proceed */
5583 goto unlock;
5584 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
5585 } else if ((spares = remove_and_add_spares(mddev))) {
24dd469d
N		 5586 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5587 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5588 } else if (mddev->recovery_cp < MaxSector) {
5589 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5590 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5591 /* nothing to be done ... */
1da177e4 5592 goto unlock;
24dd469d 5593
1da177e4
LT		 5594 if (mddev->pers->sync_request) {
5595 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 5596 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
5597 /* We are adding a device or devices to an array
5598 * which has the bitmap stored on all devices.
5599 * So make sure all bitmap pages get written
5600 */
5601 bitmap_write_all(mddev->bitmap);
5602 }
1da177e4
LT		 5603 mddev->sync_thread = md_register_thread(md_do_sync,
5604 mddev,
5605 "%s_resync");
5606 if (!mddev->sync_thread) {
5607 printk(KERN_ERR "%s: could not start resync"
5608 " thread...\n",
5609 mdname(mddev));
5610 /* leave the spares where they are, it shouldn't hurt */
5611 mddev->recovery = 0;
d7603b7e 5612 } else
1da177e4 5613 md_wakeup_thread(mddev->sync_thread);
d7603b7e 5614 md_new_event(mddev);
1da177e4
LT		 5615 }
5616 unlock:
5617 mddev_unlock(mddev);
5618 }
5619}
5620
75c96f85
AB		 5621static int md_notify_reboot(struct notifier_block *this,
5622 unsigned long code, void *x)
1da177e4
LT		 5623{
5624 struct list_head *tmp;
5625 mddev_t *mddev;
5626
5627 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
5628
5629 printk(KERN_INFO "md: stopping all md devices.\n");
5630
5631 ITERATE_MDDEV(mddev,tmp)
c71d4887 5632 if (mddev_trylock(mddev)) {
1da177e4 5633 do_md_stop (mddev, 1);
c71d4887
NB		 5634 mddev_unlock(mddev);
5635 }
1da177e4
LT		 5636 /*
5637 * certain more exotic SCSI devices are known to be
5638 * volatile wrt too early system reboots. While the
5639 * right place to handle this issue is the given
5640 * driver, we do want to have a safe RAID driver ...
5641 */
5642 mdelay(1000*1);
5643 }
5644 return NOTIFY_DONE;
5645}
5646
75c96f85 5647static struct notifier_block md_notifier = {
1da177e4
LT		 5648 .notifier_call = md_notify_reboot,
5649 .next = NULL,
5650 .priority = INT_MAX, /* before any real devices */
5651};
5652
5653static void md_geninit(void)
5654{
5655 struct proc_dir_entry *p;
5656
5657 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5658
5659 p = create_proc_entry("mdstat", S_IRUGO, NULL);
5660 if (p)
5661 p->proc_fops = &md_seq_fops;
5662}
5663
75c96f85 5664static int __init md_init(void)
1da177e4 5665{
1da177e4
LT		 5666 if (register_blkdev(MAJOR_NR, "md"))
5667 return -1;
5668 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
5669 unregister_blkdev(MAJOR_NR, "md");
5670 return -1;
5671 }
e8703fe1
N		 5672 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
5673 md_probe, NULL, NULL);
5674 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
1da177e4
LT		 5675 md_probe, NULL, NULL);
5676
1da177e4 5677 register_reboot_notifier(&md_notifier);
0b4d4147 5678 raid_table_header = register_sysctl_table(raid_root_table);
1da177e4
LT		 5679
5680 md_geninit();
5681 return (0);
5682}
5683
5684
5685#ifndef MODULE
5686
5687/*
5688 * Searches all registered partitions for autorun RAID arrays
5689 * at boot time.
5690 */
5691static dev_t detected_devices[128];
5692static int dev_cnt;
5693
5694void md_autodetect_dev(dev_t dev)
5695{
5696 if (dev_cnt >= 0 && dev_cnt < 127)
5697 detected_devices[dev_cnt++] = dev;
5698}
5699
5700
5701static void autostart_arrays(int part)
5702{
5703 mdk_rdev_t *rdev;
5704 int i;
5705
5706 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
5707
5708 for (i = 0; i < dev_cnt; i++) {
5709 dev_t dev = detected_devices[i];
5710
5711 rdev = md_import_device(dev,0, 0);
5712 if (IS_ERR(rdev))
5713 continue;
5714
b2d444d7 5715 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 5716 MD_BUG();
5717 continue;
5718 }
5719 list_add(&rdev->same_set, &pending_raid_disks);
5720 }
5721 dev_cnt = 0;
5722
5723 autorun_devices(part);
5724}
5725
fdee8ae4 5726#endif /* !MODULE */
1da177e4
LT		 5727
5728static __exit void md_exit(void)
5729{
5730 mddev_t *mddev;
5731 struct list_head *tmp;
8ab5e4c1 5732
e8703fe1
N		 5733 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
5734 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
1da177e4
LT		 5735
5736 unregister_blkdev(MAJOR_NR,"md");
5737 unregister_blkdev(mdp_major, "mdp");
5738 unregister_reboot_notifier(&md_notifier);
5739 unregister_sysctl_table(raid_table_header);
5740 remove_proc_entry("mdstat", NULL);
5741 ITERATE_MDDEV(mddev,tmp) {
5742 struct gendisk *disk = mddev->gendisk;
5743 if (!disk)
5744 continue;
5745 export_array(mddev);
5746 del_gendisk(disk);
5747 put_disk(disk);
5748 mddev->gendisk = NULL;
5749 mddev_put(mddev);
5750 }
5751}
5752
5753module_init(md_init)
5754module_exit(md_exit)
5755
f91de92e
N		 5756static int get_ro(char *buffer, struct kernel_param *kp)
5757{
5758 return sprintf(buffer, "%d", start_readonly);
5759}
5760static int set_ro(const char *val, struct kernel_param *kp)
5761{
5762 char *e;
5763 int num = simple_strtoul(val, &e, 10);
5764 if (*val && (*e == '\0' || *e == '\n')) {
5765 start_readonly = num;
4dbcdc75 5766 return 0;
f91de92e
N		 5767 }
5768 return -EINVAL;
5769}
5770
80ca3a44
N		 5771module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
5772module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6ff8d8ec 5773
f91de92e 5774
1da177e4
LT		 5775EXPORT_SYMBOL(register_md_personality);
5776EXPORT_SYMBOL(unregister_md_personality);
5777EXPORT_SYMBOL(md_error);
5778EXPORT_SYMBOL(md_done_sync);
5779EXPORT_SYMBOL(md_write_start);
5780EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 5781EXPORT_SYMBOL(md_register_thread);
5782EXPORT_SYMBOL(md_unregister_thread);
5783EXPORT_SYMBOL(md_wakeup_thread);
1da177e4
LT		 5784EXPORT_SYMBOL(md_check_recovery);
5785MODULE_LICENSE("GPL");
aa1595e9 5786MODULE_ALIAS("md");
72008652 5787MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
kernel source for telekom puls (alcatel/mediatek)