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[PATCH] Clean up Documentation/driver-model/overview.txt
[net-next-2.6.git] / drivers / md / md.c
CommitLineData
1da177e4
LT		 1/*
2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
4
5 completely rewritten, based on the MD driver code from Marc Zyngier
6
7 Changes:
8
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
16
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
19
20 Neil Brown <neilb@cse.unsw.edu.au>.
21
32a7627c
N		 22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
24
1da177e4
LT		 25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
28 any later version.
29
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
33*/
34
35#include <linux/module.h>
36#include <linux/config.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
LT		 41#include <linux/sysctl.h>
42#include <linux/devfs_fs_kernel.h>
43#include <linux/buffer_head.h> /* for invalidate_bdev */
44#include <linux/suspend.h>
d7603b7e 45#include <linux/poll.h>
1da177e4
LT		 46
47#include <linux/init.h>
48
32a7627c
N		 49#include <linux/file.h>
50
1da177e4
LT		 51#ifdef CONFIG_KMOD
52#include <linux/kmod.h>
53#endif
54
55#include <asm/unaligned.h>
56
57#define MAJOR_NR MD_MAJOR
58#define MD_DRIVER
59
60/* 63 partitions with the alternate major number (mdp) */
61#define MdpMinorShift 6
62
63#define DEBUG 0
64#define dprintk(x...) ((void)(DEBUG && printk(x)))
65
66
67#ifndef MODULE
68static void autostart_arrays (int part);
69#endif
70
2604b703 71static LIST_HEAD(pers_list);
1da177e4
LT		 72static DEFINE_SPINLOCK(pers_lock);
73
74/*
75 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
76 * is 1000 KB/sec, so the extra system load does not show up that much.
77 * Increase it if you want to have more _guaranteed_ speed. Note that
338cec32 78 * the RAID driver will use the maximum available bandwidth if the IO
1da177e4
LT		 79 * subsystem is idle. There is also an 'absolute maximum' reconstruction
80 * speed limit - in case reconstruction slows down your system despite
81 * idle IO detection.
82 *
83 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
88202a0c 84 * or /sys/block/mdX/md/sync_speed_{min,max}
1da177e4
LT		 85 */
86
87static int sysctl_speed_limit_min = 1000;
88static int sysctl_speed_limit_max = 200000;
88202a0c
N		 89static inline int speed_min(mddev_t *mddev)
90{
91 return mddev->sync_speed_min ?
92 mddev->sync_speed_min : sysctl_speed_limit_min;
93}
94
95static inline int speed_max(mddev_t *mddev)
96{
97 return mddev->sync_speed_max ?
98 mddev->sync_speed_max : sysctl_speed_limit_max;
99}
1da177e4
LT		 100
101static struct ctl_table_header *raid_table_header;
102
103static ctl_table raid_table[] = {
104 {
105 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
106 .procname = "speed_limit_min",
107 .data = &sysctl_speed_limit_min,
108 .maxlen = sizeof(int),
109 .mode = 0644,
110 .proc_handler = &proc_dointvec,
111 },
112 {
113 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
114 .procname = "speed_limit_max",
115 .data = &sysctl_speed_limit_max,
116 .maxlen = sizeof(int),
117 .mode = 0644,
118 .proc_handler = &proc_dointvec,
119 },
120 { .ctl_name = 0 }
121};
122
123static ctl_table raid_dir_table[] = {
124 {
125 .ctl_name = DEV_RAID,
126 .procname = "raid",
127 .maxlen = 0,
128 .mode = 0555,
129 .child = raid_table,
130 },
131 { .ctl_name = 0 }
132};
133
134static ctl_table raid_root_table[] = {
135 {
136 .ctl_name = CTL_DEV,
137 .procname = "dev",
138 .maxlen = 0,
139 .mode = 0555,
140 .child = raid_dir_table,
141 },
142 { .ctl_name = 0 }
143};
144
145static struct block_device_operations md_fops;
146
f91de92e
N		 147static int start_readonly;
148
d7603b7e
N		 149/*
150 * We have a system wide 'event count' that is incremented
151 * on any 'interesting' event, and readers of /proc/mdstat
152 * can use 'poll' or 'select' to find out when the event
153 * count increases.
154 *
155 * Events are:
156 * start array, stop array, error, add device, remove device,
157 * start build, activate spare
158 */
2989ddbd 159static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
d7603b7e 160static atomic_t md_event_count;
07dbd377 161static void md_new_event(mddev_t *mddev)
d7603b7e
N		 162{
163 atomic_inc(&md_event_count);
164 wake_up(&md_event_waiters);
165}
166
1da177e4
LT		 167/*
168 * Enables to iterate over all existing md arrays
169 * all_mddevs_lock protects this list.
170 */
171static LIST_HEAD(all_mddevs);
172static DEFINE_SPINLOCK(all_mddevs_lock);
173
174
175/*
176 * iterates through all used mddevs in the system.
177 * We take care to grab the all_mddevs_lock whenever navigating
178 * the list, and to always hold a refcount when unlocked.
179 * Any code which breaks out of this loop while own
180 * a reference to the current mddev and must mddev_put it.
181 */
182#define ITERATE_MDDEV(mddev,tmp) \
183 \
184 for (({ spin_lock(&all_mddevs_lock); \
185 tmp = all_mddevs.next; \
186 mddev = NULL;}); \
187 ({ if (tmp != &all_mddevs) \
188 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
189 spin_unlock(&all_mddevs_lock); \
190 if (mddev) mddev_put(mddev); \
191 mddev = list_entry(tmp, mddev_t, all_mddevs); \
192 tmp != &all_mddevs;}); \
193 ({ spin_lock(&all_mddevs_lock); \
194 tmp = tmp->next;}) \
195 )
196
197
198static int md_fail_request (request_queue_t *q, struct bio *bio)
199{
200 bio_io_error(bio, bio->bi_size);
201 return 0;
202}
203
204static inline mddev_t *mddev_get(mddev_t *mddev)
205{
206 atomic_inc(&mddev->active);
207 return mddev;
208}
209
210static void mddev_put(mddev_t *mddev)
211{
212 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
213 return;
214 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
215 list_del(&mddev->all_mddevs);
216 blk_put_queue(mddev->queue);
eae1701f 217 kobject_unregister(&mddev->kobj);
1da177e4
LT		 218 }
219 spin_unlock(&all_mddevs_lock);
220}
221
222static mddev_t * mddev_find(dev_t unit)
223{
224 mddev_t *mddev, *new = NULL;
225
226 retry:
227 spin_lock(&all_mddevs_lock);
228 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
229 if (mddev->unit == unit) {
230 mddev_get(mddev);
231 spin_unlock(&all_mddevs_lock);
990a8baf 232 kfree(new);
1da177e4
LT		 233 return mddev;
234 }
235
236 if (new) {
237 list_add(&new->all_mddevs, &all_mddevs);
238 spin_unlock(&all_mddevs_lock);
239 return new;
240 }
241 spin_unlock(&all_mddevs_lock);
242
9ffae0cf 243 new = kzalloc(sizeof(*new), GFP_KERNEL);
1da177e4
LT		 244 if (!new)
245 return NULL;
246
1da177e4
LT		 247 new->unit = unit;
248 if (MAJOR(unit) == MD_MAJOR)
249 new->md_minor = MINOR(unit);
250 else
251 new->md_minor = MINOR(unit) >> MdpMinorShift;
252
253 init_MUTEX(&new->reconfig_sem);
254 INIT_LIST_HEAD(&new->disks);
255 INIT_LIST_HEAD(&new->all_mddevs);
256 init_timer(&new->safemode_timer);
257 atomic_set(&new->active, 1);
06d91a5f 258 spin_lock_init(&new->write_lock);
3d310eb7 259 init_waitqueue_head(&new->sb_wait);
1da177e4
LT		 260
261 new->queue = blk_alloc_queue(GFP_KERNEL);
262 if (!new->queue) {
263 kfree(new);
264 return NULL;
265 }
266
267 blk_queue_make_request(new->queue, md_fail_request);
268
269 goto retry;
270}
271
272static inline int mddev_lock(mddev_t * mddev)
273{
274 return down_interruptible(&mddev->reconfig_sem);
275}
276
277static inline void mddev_lock_uninterruptible(mddev_t * mddev)
278{
279 down(&mddev->reconfig_sem);
280}
281
282static inline int mddev_trylock(mddev_t * mddev)
283{
284 return down_trylock(&mddev->reconfig_sem);
285}
286
287static inline void mddev_unlock(mddev_t * mddev)
288{
289 up(&mddev->reconfig_sem);
290
005eca5e 291 md_wakeup_thread(mddev->thread);
1da177e4
LT		 292}
293
2989ddbd 294static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
1da177e4
LT		 295{
296 mdk_rdev_t * rdev;
297 struct list_head *tmp;
298
299 ITERATE_RDEV(mddev,rdev,tmp) {
300 if (rdev->desc_nr == nr)
301 return rdev;
302 }
303 return NULL;
304}
305
306static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
307{
308 struct list_head *tmp;
309 mdk_rdev_t *rdev;
310
311 ITERATE_RDEV(mddev,rdev,tmp) {
312 if (rdev->bdev->bd_dev == dev)
313 return rdev;
314 }
315 return NULL;
316}
317
d9d166c2 318static struct mdk_personality *find_pers(int level, char *clevel)
2604b703
N		 319{
320 struct mdk_personality *pers;
d9d166c2
N		 321 list_for_each_entry(pers, &pers_list, list) {
322 if (level != LEVEL_NONE && pers->level == level)
2604b703 323 return pers;
d9d166c2
N		 324 if (strcmp(pers->name, clevel)==0)
325 return pers;
326 }
2604b703
N		 327 return NULL;
328}
329
77933d72 330static inline sector_t calc_dev_sboffset(struct block_device *bdev)
1da177e4
LT		 331{
332 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
333 return MD_NEW_SIZE_BLOCKS(size);
334}
335
336static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
337{
338 sector_t size;
339
340 size = rdev->sb_offset;
341
342 if (chunk_size)
343 size &= ~((sector_t)chunk_size/1024 - 1);
344 return size;
345}
346
347static int alloc_disk_sb(mdk_rdev_t * rdev)
348{
349 if (rdev->sb_page)
350 MD_BUG();
351
352 rdev->sb_page = alloc_page(GFP_KERNEL);
353 if (!rdev->sb_page) {
354 printk(KERN_ALERT "md: out of memory.\n");
355 return -EINVAL;
356 }
357
358 return 0;
359}
360
361static void free_disk_sb(mdk_rdev_t * rdev)
362{
363 if (rdev->sb_page) {
2d1f3b5d 364 put_page(rdev->sb_page);
1da177e4
LT		 365 rdev->sb_loaded = 0;
366 rdev->sb_page = NULL;
367 rdev->sb_offset = 0;
368 rdev->size = 0;
369 }
370}
371
372
7bfa19f2
N		 373static int super_written(struct bio *bio, unsigned int bytes_done, int error)
374{
375 mdk_rdev_t *rdev = bio->bi_private;
a9701a30 376 mddev_t *mddev = rdev->mddev;
7bfa19f2
N		 377 if (bio->bi_size)
378 return 1;
379
380 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags))
a9701a30 381 md_error(mddev, rdev);
7bfa19f2 382
a9701a30
N		 383 if (atomic_dec_and_test(&mddev->pending_writes))
384 wake_up(&mddev->sb_wait);
f8b58edf 385 bio_put(bio);
7bfa19f2
N		 386 return 0;
387}
388
a9701a30
N		 389static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
390{
391 struct bio *bio2 = bio->bi_private;
392 mdk_rdev_t *rdev = bio2->bi_private;
393 mddev_t *mddev = rdev->mddev;
394 if (bio->bi_size)
395 return 1;
396
397 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
398 error == -EOPNOTSUPP) {
399 unsigned long flags;
400 /* barriers don't appear to be supported :-( */
401 set_bit(BarriersNotsupp, &rdev->flags);
402 mddev->barriers_work = 0;
403 spin_lock_irqsave(&mddev->write_lock, flags);
404 bio2->bi_next = mddev->biolist;
405 mddev->biolist = bio2;
406 spin_unlock_irqrestore(&mddev->write_lock, flags);
407 wake_up(&mddev->sb_wait);
408 bio_put(bio);
409 return 0;
410 }
411 bio_put(bio2);
412 bio->bi_private = rdev;
413 return super_written(bio, bytes_done, error);
414}
415
7bfa19f2
N		 416void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
417 sector_t sector, int size, struct page *page)
418{
419 /* write first size bytes of page to sector of rdev
420 * Increment mddev->pending_writes before returning
421 * and decrement it on completion, waking up sb_wait
422 * if zero is reached.
423 * If an error occurred, call md_error
a9701a30
N		 424 *
425 * As we might need to resubmit the request if BIO_RW_BARRIER
426 * causes ENOTSUPP, we allocate a spare bio...
7bfa19f2
N		 427 */
428 struct bio *bio = bio_alloc(GFP_NOIO, 1);
a9701a30 429 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
7bfa19f2
N		 430
431 bio->bi_bdev = rdev->bdev;
432 bio->bi_sector = sector;
433 bio_add_page(bio, page, size, 0);
434 bio->bi_private = rdev;
435 bio->bi_end_io = super_written;
a9701a30
N		 436 bio->bi_rw = rw;
437
7bfa19f2 438 atomic_inc(&mddev->pending_writes);
a9701a30
N		 439 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
440 struct bio *rbio;
441 rw |= (1<<BIO_RW_BARRIER);
442 rbio = bio_clone(bio, GFP_NOIO);
443 rbio->bi_private = bio;
444 rbio->bi_end_io = super_written_barrier;
445 submit_bio(rw, rbio);
446 } else
447 submit_bio(rw, bio);
448}
449
450void md_super_wait(mddev_t *mddev)
451{
452 /* wait for all superblock writes that were scheduled to complete.
453 * if any had to be retried (due to BARRIER problems), retry them
454 */
455 DEFINE_WAIT(wq);
456 for(;;) {
457 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
458 if (atomic_read(&mddev->pending_writes)==0)
459 break;
460 while (mddev->biolist) {
461 struct bio *bio;
462 spin_lock_irq(&mddev->write_lock);
463 bio = mddev->biolist;
464 mddev->biolist = bio->bi_next ;
465 bio->bi_next = NULL;
466 spin_unlock_irq(&mddev->write_lock);
467 submit_bio(bio->bi_rw, bio);
468 }
469 schedule();
470 }
471 finish_wait(&mddev->sb_wait, &wq);
7bfa19f2
N		 472}
473
1da177e4
LT		 474static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
475{
476 if (bio->bi_size)
477 return 1;
478
479 complete((struct completion*)bio->bi_private);
480 return 0;
481}
482
a654b9d8 483int sync_page_io(struct block_device *bdev, sector_t sector, int size,
1da177e4
LT		 484 struct page *page, int rw)
485{
baaa2c51 486 struct bio *bio = bio_alloc(GFP_NOIO, 1);
1da177e4
LT		 487 struct completion event;
488 int ret;
489
490 rw |= (1 << BIO_RW_SYNC);
491
492 bio->bi_bdev = bdev;
493 bio->bi_sector = sector;
494 bio_add_page(bio, page, size, 0);
495 init_completion(&event);
496 bio->bi_private = &event;
497 bio->bi_end_io = bi_complete;
498 submit_bio(rw, bio);
499 wait_for_completion(&event);
500
501 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
502 bio_put(bio);
503 return ret;
504}
a8745db2 505EXPORT_SYMBOL_GPL(sync_page_io);
1da177e4 506
0002b271 507static int read_disk_sb(mdk_rdev_t * rdev, int size)
1da177e4
LT		 508{
509 char b[BDEVNAME_SIZE];
510 if (!rdev->sb_page) {
511 MD_BUG();
512 return -EINVAL;
513 }
514 if (rdev->sb_loaded)
515 return 0;
516
517
0002b271 518 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
1da177e4
LT		 519 goto fail;
520 rdev->sb_loaded = 1;
521 return 0;
522
523fail:
524 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
525 bdevname(rdev->bdev,b));
526 return -EINVAL;
527}
528
529static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
530{
531 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
532 (sb1->set_uuid1 == sb2->set_uuid1) &&
533 (sb1->set_uuid2 == sb2->set_uuid2) &&
534 (sb1->set_uuid3 == sb2->set_uuid3))
535
536 return 1;
537
538 return 0;
539}
540
541
542static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
543{
544 int ret;
545 mdp_super_t *tmp1, *tmp2;
546
547 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
548 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
549
550 if (!tmp1 || !tmp2) {
551 ret = 0;
552 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
553 goto abort;
554 }
555
556 *tmp1 = *sb1;
557 *tmp2 = *sb2;
558
559 /*
560 * nr_disks is not constant
561 */
562 tmp1->nr_disks = 0;
563 tmp2->nr_disks = 0;
564
565 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
566 ret = 0;
567 else
568 ret = 1;
569
570abort:
990a8baf
JJ		 571 kfree(tmp1);
572 kfree(tmp2);
1da177e4
LT		 573 return ret;
574}
575
576static unsigned int calc_sb_csum(mdp_super_t * sb)
577{
578 unsigned int disk_csum, csum;
579
580 disk_csum = sb->sb_csum;
581 sb->sb_csum = 0;
582 csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
583 sb->sb_csum = disk_csum;
584 return csum;
585}
586
587
588/*
589 * Handle superblock details.
590 * We want to be able to handle multiple superblock formats
591 * so we have a common interface to them all, and an array of
592 * different handlers.
593 * We rely on user-space to write the initial superblock, and support
594 * reading and updating of superblocks.
595 * Interface methods are:
596 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
597 * loads and validates a superblock on dev.
598 * if refdev != NULL, compare superblocks on both devices
599 * Return:
600 * 0 - dev has a superblock that is compatible with refdev
601 * 1 - dev has a superblock that is compatible and newer than refdev
602 * so dev should be used as the refdev in future
603 * -EINVAL superblock incompatible or invalid
604 * -othererror e.g. -EIO
605 *
606 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
607 * Verify that dev is acceptable into mddev.
608 * The first time, mddev->raid_disks will be 0, and data from
609 * dev should be merged in. Subsequent calls check that dev
610 * is new enough. Return 0 or -EINVAL
611 *
612 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
613 * Update the superblock for rdev with data in mddev
614 * This does not write to disc.
615 *
616 */
617
618struct super_type {
619 char *name;
620 struct module *owner;
621 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
622 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
623 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
624};
625
626/*
627 * load_super for 0.90.0
628 */
629static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
630{
631 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
632 mdp_super_t *sb;
633 int ret;
634 sector_t sb_offset;
635
636 /*
637 * Calculate the position of the superblock,
638 * it's at the end of the disk.
639 *
640 * It also happens to be a multiple of 4Kb.
641 */
642 sb_offset = calc_dev_sboffset(rdev->bdev);
643 rdev->sb_offset = sb_offset;
644
0002b271 645 ret = read_disk_sb(rdev, MD_SB_BYTES);
1da177e4
LT		 646 if (ret) return ret;
647
648 ret = -EINVAL;
649
650 bdevname(rdev->bdev, b);
651 sb = (mdp_super_t*)page_address(rdev->sb_page);
652
653 if (sb->md_magic != MD_SB_MAGIC) {
654 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
655 b);
656 goto abort;
657 }
658
659 if (sb->major_version != 0 ||
660 sb->minor_version != 90) {
661 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
662 sb->major_version, sb->minor_version,
663 b);
664 goto abort;
665 }
666
667 if (sb->raid_disks <= 0)
668 goto abort;
669
670 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
671 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
672 b);
673 goto abort;
674 }
675
676 rdev->preferred_minor = sb->md_minor;
677 rdev->data_offset = 0;
0002b271 678 rdev->sb_size = MD_SB_BYTES;
1da177e4
LT		 679
680 if (sb->level == LEVEL_MULTIPATH)
681 rdev->desc_nr = -1;
682 else
683 rdev->desc_nr = sb->this_disk.number;
684
685 if (refdev == 0)
686 ret = 1;
687 else {
688 __u64 ev1, ev2;
689 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
690 if (!uuid_equal(refsb, sb)) {
691 printk(KERN_WARNING "md: %s has different UUID to %s\n",
692 b, bdevname(refdev->bdev,b2));
693 goto abort;
694 }
695 if (!sb_equal(refsb, sb)) {
696 printk(KERN_WARNING "md: %s has same UUID"
697 " but different superblock to %s\n",
698 b, bdevname(refdev->bdev, b2));
699 goto abort;
700 }
701 ev1 = md_event(sb);
702 ev2 = md_event(refsb);
703 if (ev1 > ev2)
704 ret = 1;
705 else
706 ret = 0;
707 }
708 rdev->size = calc_dev_size(rdev, sb->chunk_size);
709
2bf071bf
N		 710 if (rdev->size < sb->size && sb->level > 1)
711 /* "this cannot possibly happen" ... */
712 ret = -EINVAL;
713
1da177e4
LT		 714 abort:
715 return ret;
716}
717
718/*
719 * validate_super for 0.90.0
720 */
721static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
722{
723 mdp_disk_t *desc;
724 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
725
41158c7e 726 rdev->raid_disk = -1;
b2d444d7 727 rdev->flags = 0;
1da177e4
LT		 728 if (mddev->raid_disks == 0) {
729 mddev->major_version = 0;
730 mddev->minor_version = sb->minor_version;
731 mddev->patch_version = sb->patch_version;
732 mddev->persistent = ! sb->not_persistent;
733 mddev->chunk_size = sb->chunk_size;
734 mddev->ctime = sb->ctime;
735 mddev->utime = sb->utime;
736 mddev->level = sb->level;
d9d166c2 737 mddev->clevel[0] = 0;
1da177e4
LT		 738 mddev->layout = sb->layout;
739 mddev->raid_disks = sb->raid_disks;
740 mddev->size = sb->size;
741 mddev->events = md_event(sb);
9223214e 742 mddev->bitmap_offset = 0;
36fa3063 743 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
1da177e4
LT		 744
745 if (sb->state & (1<<MD_SB_CLEAN))
746 mddev->recovery_cp = MaxSector;
747 else {
748 if (sb->events_hi == sb->cp_events_hi &&
749 sb->events_lo == sb->cp_events_lo) {
750 mddev->recovery_cp = sb->recovery_cp;
751 } else
752 mddev->recovery_cp = 0;
753 }
754
755 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
756 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
757 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
758 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
759
760 mddev->max_disks = MD_SB_DISKS;
a654b9d8
N		 761
762 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
763 mddev->bitmap_file == NULL) {
6cce3b23
N		 764 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
765 && mddev->level != 10) {
a654b9d8 766 /* FIXME use a better test */
6cce3b23 767 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
a654b9d8
N		 768 return -EINVAL;
769 }
36fa3063 770 mddev->bitmap_offset = mddev->default_bitmap_offset;
a654b9d8
N		 771 }
772
41158c7e
N		 773 } else if (mddev->pers == NULL) {
774 /* Insist on good event counter while assembling */
775 __u64 ev1 = md_event(sb);
1da177e4
LT		 776 ++ev1;
777 if (ev1 < mddev->events)
778 return -EINVAL;
41158c7e
N		 779 } else if (mddev->bitmap) {
780 /* if adding to array with a bitmap, then we can accept an
781 * older device ... but not too old.
782 */
783 __u64 ev1 = md_event(sb);
784 if (ev1 < mddev->bitmap->events_cleared)
785 return 0;
786 } else /* just a hot-add of a new device, leave raid_disk at -1 */
787 return 0;
788
1da177e4 789 if (mddev->level != LEVEL_MULTIPATH) {
1da177e4
LT		 790 desc = sb->disks + rdev->desc_nr;
791
792 if (desc->state & (1<<MD_DISK_FAULTY))
b2d444d7 793 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 794 else if (desc->state & (1<<MD_DISK_SYNC) &&
795 desc->raid_disk < mddev->raid_disks) {
b2d444d7 796 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 797 rdev->raid_disk = desc->raid_disk;
798 }
8ddf9efe
N		 799 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
800 set_bit(WriteMostly, &rdev->flags);
41158c7e 801 } else /* MULTIPATH are always insync */
b2d444d7 802 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 803 return 0;
804}
805
806/*
807 * sync_super for 0.90.0
808 */
809static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
810{
811 mdp_super_t *sb;
812 struct list_head *tmp;
813 mdk_rdev_t *rdev2;
814 int next_spare = mddev->raid_disks;
19133a42 815
1da177e4
LT		 816
817 /* make rdev->sb match mddev data..
818 *
819 * 1/ zero out disks
820 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
821 * 3/ any empty disks < next_spare become removed
822 *
823 * disks[0] gets initialised to REMOVED because
824 * we cannot be sure from other fields if it has
825 * been initialised or not.
826 */
827 int i;
828 int active=0, working=0,failed=0,spare=0,nr_disks=0;
829
61181565
N		 830 rdev->sb_size = MD_SB_BYTES;
831
1da177e4
LT		 832 sb = (mdp_super_t*)page_address(rdev->sb_page);
833
834 memset(sb, 0, sizeof(*sb));
835
836 sb->md_magic = MD_SB_MAGIC;
837 sb->major_version = mddev->major_version;
838 sb->minor_version = mddev->minor_version;
839 sb->patch_version = mddev->patch_version;
840 sb->gvalid_words = 0; /* ignored */
841 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
842 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
843 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
844 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
845
846 sb->ctime = mddev->ctime;
847 sb->level = mddev->level;
848 sb->size = mddev->size;
849 sb->raid_disks = mddev->raid_disks;
850 sb->md_minor = mddev->md_minor;
851 sb->not_persistent = !mddev->persistent;
852 sb->utime = mddev->utime;
853 sb->state = 0;
854 sb->events_hi = (mddev->events>>32);
855 sb->events_lo = (u32)mddev->events;
856
857 if (mddev->in_sync)
858 {
859 sb->recovery_cp = mddev->recovery_cp;
860 sb->cp_events_hi = (mddev->events>>32);
861 sb->cp_events_lo = (u32)mddev->events;
862 if (mddev->recovery_cp == MaxSector)
863 sb->state = (1<< MD_SB_CLEAN);
864 } else
865 sb->recovery_cp = 0;
866
867 sb->layout = mddev->layout;
868 sb->chunk_size = mddev->chunk_size;
869
a654b9d8
N		 870 if (mddev->bitmap && mddev->bitmap_file == NULL)
871 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
872
1da177e4
LT		 873 sb->disks[0].state = (1<<MD_DISK_REMOVED);
874 ITERATE_RDEV(mddev,rdev2,tmp) {
875 mdp_disk_t *d;
86e6ffdd 876 int desc_nr;
b2d444d7
N		 877 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
878 && !test_bit(Faulty, &rdev2->flags))
86e6ffdd 879 desc_nr = rdev2->raid_disk;
1da177e4 880 else
86e6ffdd 881 desc_nr = next_spare++;
19133a42 882 rdev2->desc_nr = desc_nr;
1da177e4
LT		 883 d = &sb->disks[rdev2->desc_nr];
884 nr_disks++;
885 d->number = rdev2->desc_nr;
886 d->major = MAJOR(rdev2->bdev->bd_dev);
887 d->minor = MINOR(rdev2->bdev->bd_dev);
b2d444d7
N		 888 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
889 && !test_bit(Faulty, &rdev2->flags))
1da177e4
LT		 890 d->raid_disk = rdev2->raid_disk;
891 else
892 d->raid_disk = rdev2->desc_nr; /* compatibility */
b2d444d7 893 if (test_bit(Faulty, &rdev2->flags)) {
1da177e4
LT		 894 d->state = (1<<MD_DISK_FAULTY);
895 failed++;
b2d444d7 896 } else if (test_bit(In_sync, &rdev2->flags)) {
1da177e4
LT		 897 d->state = (1<<MD_DISK_ACTIVE);
898 d->state |= (1<<MD_DISK_SYNC);
899 active++;
900 working++;
901 } else {
902 d->state = 0;
903 spare++;
904 working++;
905 }
8ddf9efe
N		 906 if (test_bit(WriteMostly, &rdev2->flags))
907 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4 908 }
1da177e4
LT		 909 /* now set the "removed" and "faulty" bits on any missing devices */
910 for (i=0 ; i < mddev->raid_disks ; i++) {
911 mdp_disk_t *d = &sb->disks[i];
912 if (d->state == 0 && d->number == 0) {
913 d->number = i;
914 d->raid_disk = i;
915 d->state = (1<<MD_DISK_REMOVED);
916 d->state |= (1<<MD_DISK_FAULTY);
917 failed++;
918 }
919 }
920 sb->nr_disks = nr_disks;
921 sb->active_disks = active;
922 sb->working_disks = working;
923 sb->failed_disks = failed;
924 sb->spare_disks = spare;
925
926 sb->this_disk = sb->disks[rdev->desc_nr];
927 sb->sb_csum = calc_sb_csum(sb);
928}
929
930/*
931 * version 1 superblock
932 */
933
934static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
935{
936 unsigned int disk_csum, csum;
937 unsigned long long newcsum;
938 int size = 256 + le32_to_cpu(sb->max_dev)*2;
939 unsigned int *isuper = (unsigned int*)sb;
940 int i;
941
942 disk_csum = sb->sb_csum;
943 sb->sb_csum = 0;
944 newcsum = 0;
945 for (i=0; size>=4; size -= 4 )
946 newcsum += le32_to_cpu(*isuper++);
947
948 if (size == 2)
949 newcsum += le16_to_cpu(*(unsigned short*) isuper);
950
951 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
952 sb->sb_csum = disk_csum;
953 return cpu_to_le32(csum);
954}
955
956static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
957{
958 struct mdp_superblock_1 *sb;
959 int ret;
960 sector_t sb_offset;
961 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 962 int bmask;
1da177e4
LT		 963
964 /*
965 * Calculate the position of the superblock.
966 * It is always aligned to a 4K boundary and
967 * depeding on minor_version, it can be:
968 * 0: At least 8K, but less than 12K, from end of device
969 * 1: At start of device
970 * 2: 4K from start of device.
971 */
972 switch(minor_version) {
973 case 0:
974 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
975 sb_offset -= 8*2;
39730960 976 sb_offset &= ~(sector_t)(4*2-1);
1da177e4
LT		 977 /* convert from sectors to K */
978 sb_offset /= 2;
979 break;
980 case 1:
981 sb_offset = 0;
982 break;
983 case 2:
984 sb_offset = 4;
985 break;
986 default:
987 return -EINVAL;
988 }
989 rdev->sb_offset = sb_offset;
990
0002b271
N		 991 /* superblock is rarely larger than 1K, but it can be larger,
992 * and it is safe to read 4k, so we do that
993 */
994 ret = read_disk_sb(rdev, 4096);
1da177e4
LT		 995 if (ret) return ret;
996
997
998 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
999
1000 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1001 sb->major_version != cpu_to_le32(1) ||
1002 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1003 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
71c0805c 1004 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT		 1005 return -EINVAL;
1006
1007 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1008 printk("md: invalid superblock checksum on %s\n",
1009 bdevname(rdev->bdev,b));
1010 return -EINVAL;
1011 }
1012 if (le64_to_cpu(sb->data_size) < 10) {
1013 printk("md: data_size too small on %s\n",
1014 bdevname(rdev->bdev,b));
1015 return -EINVAL;
1016 }
1017 rdev->preferred_minor = 0xffff;
1018 rdev->data_offset = le64_to_cpu(sb->data_offset);
4dbcdc75 1019 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1da177e4 1020
0002b271 1021 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
720a3dc3 1022 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
0002b271
N		 1023 if (rdev->sb_size & bmask)
1024 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1025
1da177e4
LT		 1026 if (refdev == 0)
1027 return 1;
1028 else {
1029 __u64 ev1, ev2;
1030 struct mdp_superblock_1 *refsb =
1031 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1032
1033 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1034 sb->level != refsb->level ||
1035 sb->layout != refsb->layout ||
1036 sb->chunksize != refsb->chunksize) {
1037 printk(KERN_WARNING "md: %s has strangely different"
1038 " superblock to %s\n",
1039 bdevname(rdev->bdev,b),
1040 bdevname(refdev->bdev,b2));
1041 return -EINVAL;
1042 }
1043 ev1 = le64_to_cpu(sb->events);
1044 ev2 = le64_to_cpu(refsb->events);
1045
1046 if (ev1 > ev2)
1047 return 1;
1048 }
1049 if (minor_version)
1050 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1051 else
1052 rdev->size = rdev->sb_offset;
1053 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1054 return -EINVAL;
1055 rdev->size = le64_to_cpu(sb->data_size)/2;
1056 if (le32_to_cpu(sb->chunksize))
1057 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
2bf071bf
N		 1058
1059 if (le32_to_cpu(sb->size) > rdev->size*2)
1060 return -EINVAL;
1da177e4
LT		 1061 return 0;
1062}
1063
1064static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1065{
1066 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1067
41158c7e 1068 rdev->raid_disk = -1;
b2d444d7 1069 rdev->flags = 0;
1da177e4
LT		 1070 if (mddev->raid_disks == 0) {
1071 mddev->major_version = 1;
1072 mddev->patch_version = 0;
1073 mddev->persistent = 1;
1074 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1075 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1076 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1077 mddev->level = le32_to_cpu(sb->level);
d9d166c2 1078 mddev->clevel[0] = 0;
1da177e4
LT		 1079 mddev->layout = le32_to_cpu(sb->layout);
1080 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1081 mddev->size = le64_to_cpu(sb->size)/2;
1082 mddev->events = le64_to_cpu(sb->events);
9223214e 1083 mddev->bitmap_offset = 0;
53e87fbb 1084 mddev->default_bitmap_offset = 1024;
1da177e4
LT		 1085
1086 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1087 memcpy(mddev->uuid, sb->set_uuid, 16);
1088
1089 mddev->max_disks = (4096-256)/2;
a654b9d8 1090
71c0805c 1091 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
a654b9d8 1092 mddev->bitmap_file == NULL ) {
6cce3b23
N		 1093 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
1094 && mddev->level != 10) {
1095 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
a654b9d8
N		 1096 return -EINVAL;
1097 }
1098 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1099 }
41158c7e
N		 1100 } else if (mddev->pers == NULL) {
1101 /* Insist of good event counter while assembling */
1102 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4
LT		 1103 ++ev1;
1104 if (ev1 < mddev->events)
1105 return -EINVAL;
41158c7e
N		 1106 } else if (mddev->bitmap) {
1107 /* If adding to array with a bitmap, then we can accept an
1108 * older device, but not too old.
1109 */
1110 __u64 ev1 = le64_to_cpu(sb->events);
1111 if (ev1 < mddev->bitmap->events_cleared)
1112 return 0;
1113 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1114 return 0;
1da177e4
LT		 1115
1116 if (mddev->level != LEVEL_MULTIPATH) {
1117 int role;
1118 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1119 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1120 switch(role) {
1121 case 0xffff: /* spare */
1da177e4
LT		 1122 break;
1123 case 0xfffe: /* faulty */
b2d444d7 1124 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 1125 break;
1126 default:
b2d444d7 1127 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1128 rdev->raid_disk = role;
1129 break;
1130 }
8ddf9efe
N		 1131 if (sb->devflags & WriteMostly1)
1132 set_bit(WriteMostly, &rdev->flags);
41158c7e 1133 } else /* MULTIPATH are always insync */
b2d444d7 1134 set_bit(In_sync, &rdev->flags);
41158c7e 1135
1da177e4
LT		 1136 return 0;
1137}
1138
1139static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1140{
1141 struct mdp_superblock_1 *sb;
1142 struct list_head *tmp;
1143 mdk_rdev_t *rdev2;
1144 int max_dev, i;
1145 /* make rdev->sb match mddev and rdev data. */
1146
1147 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1148
1149 sb->feature_map = 0;
1150 sb->pad0 = 0;
1151 memset(sb->pad1, 0, sizeof(sb->pad1));
1152 memset(sb->pad2, 0, sizeof(sb->pad2));
1153 memset(sb->pad3, 0, sizeof(sb->pad3));
1154
1155 sb->utime = cpu_to_le64((__u64)mddev->utime);
1156 sb->events = cpu_to_le64(mddev->events);
1157 if (mddev->in_sync)
1158 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1159 else
1160 sb->resync_offset = cpu_to_le64(0);
1161
4dbcdc75
N		 1162 sb->cnt_corrected_read = atomic_read(&rdev->corrected_errors);
1163
f0ca340c
N		 1164 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1165 sb->size = cpu_to_le64(mddev->size);
1166
a654b9d8
N		 1167 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1168 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
71c0805c 1169 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8
N		 1170 }
1171
1da177e4
LT		 1172 max_dev = 0;
1173 ITERATE_RDEV(mddev,rdev2,tmp)
1174 if (rdev2->desc_nr+1 > max_dev)
1175 max_dev = rdev2->desc_nr+1;
1176
1177 sb->max_dev = cpu_to_le32(max_dev);
1178 for (i=0; i<max_dev;i++)
1179 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1180
1181 ITERATE_RDEV(mddev,rdev2,tmp) {
1182 i = rdev2->desc_nr;
b2d444d7 1183 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1184 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1185 else if (test_bit(In_sync, &rdev2->flags))
1da177e4
LT		 1186 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1187 else
1188 sb->dev_roles[i] = cpu_to_le16(0xffff);
1189 }
1190
1191 sb->recovery_offset = cpu_to_le64(0); /* not supported yet */
1192 sb->sb_csum = calc_sb_1_csum(sb);
1193}
1194
1195
75c96f85 1196static struct super_type super_types[] = {
1da177e4
LT		 1197 [0] = {
1198 .name = "0.90.0",
1199 .owner = THIS_MODULE,
1200 .load_super = super_90_load,
1201 .validate_super = super_90_validate,
1202 .sync_super = super_90_sync,
1203 },
1204 [1] = {
1205 .name = "md-1",
1206 .owner = THIS_MODULE,
1207 .load_super = super_1_load,
1208 .validate_super = super_1_validate,
1209 .sync_super = super_1_sync,
1210 },
1211};
1212
1213static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1214{
1215 struct list_head *tmp;
1216 mdk_rdev_t *rdev;
1217
1218 ITERATE_RDEV(mddev,rdev,tmp)
1219 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1220 return rdev;
1221
1222 return NULL;
1223}
1224
1225static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1226{
1227 struct list_head *tmp;
1228 mdk_rdev_t *rdev;
1229
1230 ITERATE_RDEV(mddev1,rdev,tmp)
1231 if (match_dev_unit(mddev2, rdev))
1232 return 1;
1233
1234 return 0;
1235}
1236
1237static LIST_HEAD(pending_raid_disks);
1238
1239static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1240{
1241 mdk_rdev_t *same_pdev;
1242 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
f637b9f9 1243 struct kobject *ko;
1edf80d3 1244 char *s;
1da177e4
LT		 1245
1246 if (rdev->mddev) {
1247 MD_BUG();
1248 return -EINVAL;
1249 }
2bf071bf
N		 1250 /* make sure rdev->size exceeds mddev->size */
1251 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1252 if (mddev->pers)
1253 /* Cannot change size, so fail */
1254 return -ENOSPC;
1255 else
1256 mddev->size = rdev->size;
1257 }
1da177e4
LT		 1258 same_pdev = match_dev_unit(mddev, rdev);
1259 if (same_pdev)
1260 printk(KERN_WARNING
1261 "%s: WARNING: %s appears to be on the same physical"
1262 " disk as %s. True\n protection against single-disk"
1263 " failure might be compromised.\n",
1264 mdname(mddev), bdevname(rdev->bdev,b),
1265 bdevname(same_pdev->bdev,b2));
1266
1267 /* Verify rdev->desc_nr is unique.
1268 * If it is -1, assign a free number, else
1269 * check number is not in use
1270 */
1271 if (rdev->desc_nr < 0) {
1272 int choice = 0;
1273 if (mddev->pers) choice = mddev->raid_disks;
1274 while (find_rdev_nr(mddev, choice))
1275 choice++;
1276 rdev->desc_nr = choice;
1277 } else {
1278 if (find_rdev_nr(mddev, rdev->desc_nr))
1279 return -EBUSY;
1280 }
19133a42
N		 1281 bdevname(rdev->bdev,b);
1282 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1283 return -ENOMEM;
1edf80d3
NB		 1284 while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
1285 *s = '!';
1da177e4
LT		 1286
1287 list_add(&rdev->same_set, &mddev->disks);
1288 rdev->mddev = mddev;
19133a42 1289 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 1290
9c791977 1291 rdev->kobj.parent = &mddev->kobj;
86e6ffdd
N		 1292 kobject_add(&rdev->kobj);
1293
f637b9f9
N		 1294 if (rdev->bdev->bd_part)
1295 ko = &rdev->bdev->bd_part->kobj;
1296 else
1297 ko = &rdev->bdev->bd_disk->kobj;
1298 sysfs_create_link(&rdev->kobj, ko, "block");
1da177e4
LT		 1299 return 0;
1300}
1301
1302static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1303{
1304 char b[BDEVNAME_SIZE];
1305 if (!rdev->mddev) {
1306 MD_BUG();
1307 return;
1308 }
1309 list_del_init(&rdev->same_set);
1310 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1311 rdev->mddev = NULL;
86e6ffdd
N		 1312 sysfs_remove_link(&rdev->kobj, "block");
1313 kobject_del(&rdev->kobj);
1da177e4
LT		 1314}
1315
1316/*
1317 * prevent the device from being mounted, repartitioned or
1318 * otherwise reused by a RAID array (or any other kernel
1319 * subsystem), by bd_claiming the device.
1320 */
1321static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1322{
1323 int err = 0;
1324 struct block_device *bdev;
1325 char b[BDEVNAME_SIZE];
1326
1327 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1328 if (IS_ERR(bdev)) {
1329 printk(KERN_ERR "md: could not open %s.\n",
1330 __bdevname(dev, b));
1331 return PTR_ERR(bdev);
1332 }
1333 err = bd_claim(bdev, rdev);
1334 if (err) {
1335 printk(KERN_ERR "md: could not bd_claim %s.\n",
1336 bdevname(bdev, b));
1337 blkdev_put(bdev);
1338 return err;
1339 }
1340 rdev->bdev = bdev;
1341 return err;
1342}
1343
1344static void unlock_rdev(mdk_rdev_t *rdev)
1345{
1346 struct block_device *bdev = rdev->bdev;
1347 rdev->bdev = NULL;
1348 if (!bdev)
1349 MD_BUG();
1350 bd_release(bdev);
1351 blkdev_put(bdev);
1352}
1353
1354void md_autodetect_dev(dev_t dev);
1355
1356static void export_rdev(mdk_rdev_t * rdev)
1357{
1358 char b[BDEVNAME_SIZE];
1359 printk(KERN_INFO "md: export_rdev(%s)\n",
1360 bdevname(rdev->bdev,b));
1361 if (rdev->mddev)
1362 MD_BUG();
1363 free_disk_sb(rdev);
1364 list_del_init(&rdev->same_set);
1365#ifndef MODULE
1366 md_autodetect_dev(rdev->bdev->bd_dev);
1367#endif
1368 unlock_rdev(rdev);
86e6ffdd 1369 kobject_put(&rdev->kobj);
1da177e4
LT		 1370}
1371
1372static void kick_rdev_from_array(mdk_rdev_t * rdev)
1373{
1374 unbind_rdev_from_array(rdev);
1375 export_rdev(rdev);
1376}
1377
1378static void export_array(mddev_t *mddev)
1379{
1380 struct list_head *tmp;
1381 mdk_rdev_t *rdev;
1382
1383 ITERATE_RDEV(mddev,rdev,tmp) {
1384 if (!rdev->mddev) {
1385 MD_BUG();
1386 continue;
1387 }
1388 kick_rdev_from_array(rdev);
1389 }
1390 if (!list_empty(&mddev->disks))
1391 MD_BUG();
1392 mddev->raid_disks = 0;
1393 mddev->major_version = 0;
1394}
1395
1396static void print_desc(mdp_disk_t *desc)
1397{
1398 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1399 desc->major,desc->minor,desc->raid_disk,desc->state);
1400}
1401
1402static void print_sb(mdp_super_t *sb)
1403{
1404 int i;
1405
1406 printk(KERN_INFO
1407 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1408 sb->major_version, sb->minor_version, sb->patch_version,
1409 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1410 sb->ctime);
1411 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1412 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1413 sb->md_minor, sb->layout, sb->chunk_size);
1414 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1415 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1416 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1417 sb->failed_disks, sb->spare_disks,
1418 sb->sb_csum, (unsigned long)sb->events_lo);
1419
1420 printk(KERN_INFO);
1421 for (i = 0; i < MD_SB_DISKS; i++) {
1422 mdp_disk_t *desc;
1423
1424 desc = sb->disks + i;
1425 if (desc->number || desc->major || desc->minor ||
1426 desc->raid_disk || (desc->state && (desc->state != 4))) {
1427 printk(" D %2d: ", i);
1428 print_desc(desc);
1429 }
1430 }
1431 printk(KERN_INFO "md: THIS: ");
1432 print_desc(&sb->this_disk);
1433
1434}
1435
1436static void print_rdev(mdk_rdev_t *rdev)
1437{
1438 char b[BDEVNAME_SIZE];
1439 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1440 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
b2d444d7
N		 1441 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1442 rdev->desc_nr);
1da177e4
LT		 1443 if (rdev->sb_loaded) {
1444 printk(KERN_INFO "md: rdev superblock:\n");
1445 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1446 } else
1447 printk(KERN_INFO "md: no rdev superblock!\n");
1448}
1449
1450void md_print_devices(void)
1451{
1452 struct list_head *tmp, *tmp2;
1453 mdk_rdev_t *rdev;
1454 mddev_t *mddev;
1455 char b[BDEVNAME_SIZE];
1456
1457 printk("\n");
1458 printk("md: **********************************\n");
1459 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1460 printk("md: **********************************\n");
1461 ITERATE_MDDEV(mddev,tmp) {
1da177e4 1462
32a7627c
N		 1463 if (mddev->bitmap)
1464 bitmap_print_sb(mddev->bitmap);
1465 else
1466 printk("%s: ", mdname(mddev));
1da177e4
LT		 1467 ITERATE_RDEV(mddev,rdev,tmp2)
1468 printk("<%s>", bdevname(rdev->bdev,b));
1469 printk("\n");
1470
1471 ITERATE_RDEV(mddev,rdev,tmp2)
1472 print_rdev(rdev);
1473 }
1474 printk("md: **********************************\n");
1475 printk("\n");
1476}
1477
1478
1da177e4
LT		 1479static void sync_sbs(mddev_t * mddev)
1480{
1481 mdk_rdev_t *rdev;
1482 struct list_head *tmp;
1483
1484 ITERATE_RDEV(mddev,rdev,tmp) {
1485 super_types[mddev->major_version].
1486 sync_super(mddev, rdev);
1487 rdev->sb_loaded = 1;
1488 }
1489}
1490
1491static void md_update_sb(mddev_t * mddev)
1492{
7bfa19f2 1493 int err;
1da177e4
LT		 1494 struct list_head *tmp;
1495 mdk_rdev_t *rdev;
06d91a5f 1496 int sync_req;
1da177e4 1497
1da177e4 1498repeat:
a9701a30 1499 spin_lock_irq(&mddev->write_lock);
06d91a5f 1500 sync_req = mddev->in_sync;
1da177e4
LT		 1501 mddev->utime = get_seconds();
1502 mddev->events ++;
1503
1504 if (!mddev->events) {
1505 /*
1506 * oops, this 64-bit counter should never wrap.
1507 * Either we are in around ~1 trillion A.C., assuming
1508 * 1 reboot per second, or we have a bug:
1509 */
1510 MD_BUG();
1511 mddev->events --;
1512 }
7bfa19f2 1513 mddev->sb_dirty = 2;
1da177e4
LT		 1514 sync_sbs(mddev);
1515
1516 /*
1517 * do not write anything to disk if using
1518 * nonpersistent superblocks
1519 */
06d91a5f
N		 1520 if (!mddev->persistent) {
1521 mddev->sb_dirty = 0;
a9701a30 1522 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1523 wake_up(&mddev->sb_wait);
1da177e4 1524 return;
06d91a5f 1525 }
a9701a30 1526 spin_unlock_irq(&mddev->write_lock);
1da177e4
LT		 1527
1528 dprintk(KERN_INFO
1529 "md: updating %s RAID superblock on device (in sync %d)\n",
1530 mdname(mddev),mddev->in_sync);
1531
32a7627c 1532 err = bitmap_update_sb(mddev->bitmap);
1da177e4
LT		 1533 ITERATE_RDEV(mddev,rdev,tmp) {
1534 char b[BDEVNAME_SIZE];
1535 dprintk(KERN_INFO "md: ");
b2d444d7 1536 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1537 dprintk("(skipping faulty ");
1538
1539 dprintk("%s ", bdevname(rdev->bdev,b));
b2d444d7 1540 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 1541 md_super_write(mddev,rdev,
0002b271 1542 rdev->sb_offset<<1, rdev->sb_size,
7bfa19f2
N		 1543 rdev->sb_page);
1544 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1545 bdevname(rdev->bdev,b),
1546 (unsigned long long)rdev->sb_offset);
1547
1da177e4
LT		 1548 } else
1549 dprintk(")\n");
7bfa19f2 1550 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT		 1551 /* only need to write one superblock... */
1552 break;
1553 }
a9701a30 1554 md_super_wait(mddev);
7bfa19f2
N		 1555 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1556
a9701a30 1557 spin_lock_irq(&mddev->write_lock);
7bfa19f2 1558 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
06d91a5f 1559 /* have to write it out again */
a9701a30 1560 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N		 1561 goto repeat;
1562 }
1563 mddev->sb_dirty = 0;
a9701a30 1564 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1565 wake_up(&mddev->sb_wait);
06d91a5f 1566
1da177e4
LT		 1567}
1568
bce74dac
N		 1569/* words written to sysfs files may, or my not, be \n terminated.
1570 * We want to accept with case. For this we use cmd_match.
1571 */
1572static int cmd_match(const char *cmd, const char *str)
1573{
1574 /* See if cmd, written into a sysfs file, matches
1575 * str. They must either be the same, or cmd can
1576 * have a trailing newline
1577 */
1578 while (*cmd && *str && *cmd == *str) {
1579 cmd++;
1580 str++;
1581 }
1582 if (*cmd == '\n')
1583 cmd++;
1584 if (*str || *cmd)
1585 return 0;
1586 return 1;
1587}
1588
86e6ffdd
N		 1589struct rdev_sysfs_entry {
1590 struct attribute attr;
1591 ssize_t (*show)(mdk_rdev_t *, char *);
1592 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1593};
1594
1595static ssize_t
96de1e66 1596state_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1597{
1598 char *sep = "";
1599 int len=0;
1600
b2d444d7 1601 if (test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 1602 len+= sprintf(page+len, "%sfaulty",sep);
1603 sep = ",";
1604 }
b2d444d7 1605 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1606 len += sprintf(page+len, "%sin_sync",sep);
1607 sep = ",";
1608 }
b2d444d7
N		 1609 if (!test_bit(Faulty, &rdev->flags) &&
1610 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1611 len += sprintf(page+len, "%sspare", sep);
1612 sep = ",";
1613 }
1614 return len+sprintf(page+len, "\n");
1615}
1616
96de1e66
N		 1617static struct rdev_sysfs_entry
1618rdev_state = __ATTR_RO(state);
86e6ffdd
N		 1619
1620static ssize_t
96de1e66 1621super_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1622{
1623 if (rdev->sb_loaded && rdev->sb_size) {
1624 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1625 return rdev->sb_size;
1626 } else
1627 return 0;
1628}
96de1e66
N		 1629static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1630
4dbcdc75
N		 1631static ssize_t
1632errors_show(mdk_rdev_t *rdev, char *page)
1633{
1634 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1635}
1636
1637static ssize_t
1638errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1639{
1640 char *e;
1641 unsigned long n = simple_strtoul(buf, &e, 10);
1642 if (*buf && (*e == 0 || *e == '\n')) {
1643 atomic_set(&rdev->corrected_errors, n);
1644 return len;
1645 }
1646 return -EINVAL;
1647}
1648static struct rdev_sysfs_entry rdev_errors =
1649__ATTR(errors, 0644, errors_show, errors_store);
1650
014236d2
N		 1651static ssize_t
1652slot_show(mdk_rdev_t *rdev, char *page)
1653{
1654 if (rdev->raid_disk < 0)
1655 return sprintf(page, "none\n");
1656 else
1657 return sprintf(page, "%d\n", rdev->raid_disk);
1658}
1659
1660static ssize_t
1661slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1662{
1663 char *e;
1664 int slot = simple_strtoul(buf, &e, 10);
1665 if (strncmp(buf, "none", 4)==0)
1666 slot = -1;
1667 else if (e==buf || (*e && *e!= '\n'))
1668 return -EINVAL;
1669 if (rdev->mddev->pers)
1670 /* Cannot set slot in active array (yet) */
1671 return -EBUSY;
1672 if (slot >= rdev->mddev->raid_disks)
1673 return -ENOSPC;
1674 rdev->raid_disk = slot;
1675 /* assume it is working */
1676 rdev->flags = 0;
1677 set_bit(In_sync, &rdev->flags);
1678 return len;
1679}
1680
1681
1682static struct rdev_sysfs_entry rdev_slot =
1683__ATTR(slot, 0644, slot_show, slot_store);
1684
93c8cad0
N		 1685static ssize_t
1686offset_show(mdk_rdev_t *rdev, char *page)
1687{
6961ece4 1688 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
93c8cad0
N		 1689}
1690
1691static ssize_t
1692offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1693{
1694 char *e;
1695 unsigned long long offset = simple_strtoull(buf, &e, 10);
1696 if (e==buf || (*e && *e != '\n'))
1697 return -EINVAL;
1698 if (rdev->mddev->pers)
1699 return -EBUSY;
1700 rdev->data_offset = offset;
1701 return len;
1702}
1703
1704static struct rdev_sysfs_entry rdev_offset =
1705__ATTR(offset, 0644, offset_show, offset_store);
1706
83303b61
N		 1707static ssize_t
1708rdev_size_show(mdk_rdev_t *rdev, char *page)
1709{
1710 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1711}
1712
1713static ssize_t
1714rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1715{
1716 char *e;
1717 unsigned long long size = simple_strtoull(buf, &e, 10);
1718 if (e==buf || (*e && *e != '\n'))
1719 return -EINVAL;
1720 if (rdev->mddev->pers)
1721 return -EBUSY;
1722 rdev->size = size;
1723 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1724 rdev->mddev->size = size;
1725 return len;
1726}
1727
1728static struct rdev_sysfs_entry rdev_size =
1729__ATTR(size, 0644, rdev_size_show, rdev_size_store);
1730
86e6ffdd
N		 1731static struct attribute *rdev_default_attrs[] = {
1732 &rdev_state.attr,
1733 &rdev_super.attr,
4dbcdc75 1734 &rdev_errors.attr,
014236d2 1735 &rdev_slot.attr,
93c8cad0 1736 &rdev_offset.attr,
83303b61 1737 &rdev_size.attr,
86e6ffdd
N		 1738 NULL,
1739};
1740static ssize_t
1741rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1742{
1743 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1744 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1745
1746 if (!entry->show)
1747 return -EIO;
1748 return entry->show(rdev, page);
1749}
1750
1751static ssize_t
1752rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1753 const char *page, size_t length)
1754{
1755 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1756 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1757
1758 if (!entry->store)
1759 return -EIO;
1760 return entry->store(rdev, page, length);
1761}
1762
1763static void rdev_free(struct kobject *ko)
1764{
1765 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1766 kfree(rdev);
1767}
1768static struct sysfs_ops rdev_sysfs_ops = {
1769 .show = rdev_attr_show,
1770 .store = rdev_attr_store,
1771};
1772static struct kobj_type rdev_ktype = {
1773 .release = rdev_free,
1774 .sysfs_ops = &rdev_sysfs_ops,
1775 .default_attrs = rdev_default_attrs,
1776};
1777
1da177e4
LT		 1778/*
1779 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1780 *
1781 * mark the device faulty if:
1782 *
1783 * - the device is nonexistent (zero size)
1784 * - the device has no valid superblock
1785 *
1786 * a faulty rdev _never_ has rdev->sb set.
1787 */
1788static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1789{
1790 char b[BDEVNAME_SIZE];
1791 int err;
1792 mdk_rdev_t *rdev;
1793 sector_t size;
1794
9ffae0cf 1795 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1da177e4
LT		 1796 if (!rdev) {
1797 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1798 return ERR_PTR(-ENOMEM);
1799 }
1da177e4
LT		 1800
1801 if ((err = alloc_disk_sb(rdev)))
1802 goto abort_free;
1803
1804 err = lock_rdev(rdev, newdev);
1805 if (err)
1806 goto abort_free;
1807
86e6ffdd
N		 1808 rdev->kobj.parent = NULL;
1809 rdev->kobj.ktype = &rdev_ktype;
1810 kobject_init(&rdev->kobj);
1811
1da177e4 1812 rdev->desc_nr = -1;
b2d444d7 1813 rdev->flags = 0;
1da177e4
LT		 1814 rdev->data_offset = 0;
1815 atomic_set(&rdev->nr_pending, 0);
ba22dcbf 1816 atomic_set(&rdev->read_errors, 0);
4dbcdc75 1817 atomic_set(&rdev->corrected_errors, 0);
1da177e4
LT		 1818
1819 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
1820 if (!size) {
1821 printk(KERN_WARNING
1822 "md: %s has zero or unknown size, marking faulty!\n",
1823 bdevname(rdev->bdev,b));
1824 err = -EINVAL;
1825 goto abort_free;
1826 }
1827
1828 if (super_format >= 0) {
1829 err = super_types[super_format].
1830 load_super(rdev, NULL, super_minor);
1831 if (err == -EINVAL) {
1832 printk(KERN_WARNING
1833 "md: %s has invalid sb, not importing!\n",
1834 bdevname(rdev->bdev,b));
1835 goto abort_free;
1836 }
1837 if (err < 0) {
1838 printk(KERN_WARNING
1839 "md: could not read %s's sb, not importing!\n",
1840 bdevname(rdev->bdev,b));
1841 goto abort_free;
1842 }
1843 }
1844 INIT_LIST_HEAD(&rdev->same_set);
1845
1846 return rdev;
1847
1848abort_free:
1849 if (rdev->sb_page) {
1850 if (rdev->bdev)
1851 unlock_rdev(rdev);
1852 free_disk_sb(rdev);
1853 }
1854 kfree(rdev);
1855 return ERR_PTR(err);
1856}
1857
1858/*
1859 * Check a full RAID array for plausibility
1860 */
1861
1862
a757e64c 1863static void analyze_sbs(mddev_t * mddev)
1da177e4
LT		 1864{
1865 int i;
1866 struct list_head *tmp;
1867 mdk_rdev_t *rdev, *freshest;
1868 char b[BDEVNAME_SIZE];
1869
1870 freshest = NULL;
1871 ITERATE_RDEV(mddev,rdev,tmp)
1872 switch (super_types[mddev->major_version].
1873 load_super(rdev, freshest, mddev->minor_version)) {
1874 case 1:
1875 freshest = rdev;
1876 break;
1877 case 0:
1878 break;
1879 default:
1880 printk( KERN_ERR \
1881 "md: fatal superblock inconsistency in %s"
1882 " -- removing from array\n",
1883 bdevname(rdev->bdev,b));
1884 kick_rdev_from_array(rdev);
1885 }
1886
1887
1888 super_types[mddev->major_version].
1889 validate_super(mddev, freshest);
1890
1891 i = 0;
1892 ITERATE_RDEV(mddev,rdev,tmp) {
1893 if (rdev != freshest)
1894 if (super_types[mddev->major_version].
1895 validate_super(mddev, rdev)) {
1896 printk(KERN_WARNING "md: kicking non-fresh %s"
1897 " from array!\n",
1898 bdevname(rdev->bdev,b));
1899 kick_rdev_from_array(rdev);
1900 continue;
1901 }
1902 if (mddev->level == LEVEL_MULTIPATH) {
1903 rdev->desc_nr = i++;
1904 rdev->raid_disk = rdev->desc_nr;
b2d444d7 1905 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1906 }
1907 }
1908
1909
1910
1911 if (mddev->recovery_cp != MaxSector &&
1912 mddev->level >= 1)
1913 printk(KERN_ERR "md: %s: raid array is not clean"
1914 " -- starting background reconstruction\n",
1915 mdname(mddev));
1916
1da177e4
LT		 1917}
1918
eae1701f 1919static ssize_t
96de1e66 1920level_show(mddev_t *mddev, char *page)
eae1701f 1921{
2604b703 1922 struct mdk_personality *p = mddev->pers;
d9d166c2 1923 if (p)
eae1701f 1924 return sprintf(page, "%s\n", p->name);
d9d166c2
N		 1925 else if (mddev->clevel[0])
1926 return sprintf(page, "%s\n", mddev->clevel);
1927 else if (mddev->level != LEVEL_NONE)
1928 return sprintf(page, "%d\n", mddev->level);
1929 else
1930 return 0;
eae1701f
N		 1931}
1932
d9d166c2
N		 1933static ssize_t
1934level_store(mddev_t *mddev, const char *buf, size_t len)
1935{
1936 int rv = len;
1937 if (mddev->pers)
1938 return -EBUSY;
1939 if (len == 0)
1940 return 0;
1941 if (len >= sizeof(mddev->clevel))
1942 return -ENOSPC;
1943 strncpy(mddev->clevel, buf, len);
1944 if (mddev->clevel[len-1] == '\n')
1945 len--;
1946 mddev->clevel[len] = 0;
1947 mddev->level = LEVEL_NONE;
1948 return rv;
1949}
1950
1951static struct md_sysfs_entry md_level =
1952__ATTR(level, 0644, level_show, level_store);
eae1701f
N		 1953
1954static ssize_t
96de1e66 1955raid_disks_show(mddev_t *mddev, char *page)
eae1701f 1956{
bb636547
N		 1957 if (mddev->raid_disks == 0)
1958 return 0;
eae1701f
N		 1959 return sprintf(page, "%d\n", mddev->raid_disks);
1960}
1961
da943b99
N		 1962static int update_raid_disks(mddev_t *mddev, int raid_disks);
1963
1964static ssize_t
1965raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
1966{
1967 /* can only set raid_disks if array is not yet active */
1968 char *e;
1969 int rv = 0;
1970 unsigned long n = simple_strtoul(buf, &e, 10);
1971
1972 if (!*buf || (*e && *e != '\n'))
1973 return -EINVAL;
1974
1975 if (mddev->pers)
1976 rv = update_raid_disks(mddev, n);
1977 else
1978 mddev->raid_disks = n;
1979 return rv ? rv : len;
1980}
1981static struct md_sysfs_entry md_raid_disks =
1982__ATTR(raid_disks, 0644, raid_disks_show, raid_disks_store);
eae1701f 1983
3b34380a
N		 1984static ssize_t
1985chunk_size_show(mddev_t *mddev, char *page)
1986{
1987 return sprintf(page, "%d\n", mddev->chunk_size);
1988}
1989
1990static ssize_t
1991chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
1992{
1993 /* can only set chunk_size if array is not yet active */
1994 char *e;
1995 unsigned long n = simple_strtoul(buf, &e, 10);
1996
1997 if (mddev->pers)
1998 return -EBUSY;
1999 if (!*buf || (*e && *e != '\n'))
2000 return -EINVAL;
2001
2002 mddev->chunk_size = n;
2003 return len;
2004}
2005static struct md_sysfs_entry md_chunk_size =
2006__ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
2007
6d7ff738
N		 2008static ssize_t
2009null_show(mddev_t *mddev, char *page)
2010{
2011 return -EINVAL;
2012}
2013
2014static ssize_t
2015new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2016{
2017 /* buf must be %d:%d\n? giving major and minor numbers */
2018 /* The new device is added to the array.
2019 * If the array has a persistent superblock, we read the
2020 * superblock to initialise info and check validity.
2021 * Otherwise, only checking done is that in bind_rdev_to_array,
2022 * which mainly checks size.
2023 */
2024 char *e;
2025 int major = simple_strtoul(buf, &e, 10);
2026 int minor;
2027 dev_t dev;
2028 mdk_rdev_t *rdev;
2029 int err;
2030
2031 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2032 return -EINVAL;
2033 minor = simple_strtoul(e+1, &e, 10);
2034 if (*e && *e != '\n')
2035 return -EINVAL;
2036 dev = MKDEV(major, minor);
2037 if (major != MAJOR(dev) ||
2038 minor != MINOR(dev))
2039 return -EOVERFLOW;
2040
2041
2042 if (mddev->persistent) {
2043 rdev = md_import_device(dev, mddev->major_version,
2044 mddev->minor_version);
2045 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2046 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2047 mdk_rdev_t, same_set);
2048 err = super_types[mddev->major_version]
2049 .load_super(rdev, rdev0, mddev->minor_version);
2050 if (err < 0)
2051 goto out;
2052 }
2053 } else
2054 rdev = md_import_device(dev, -1, -1);
2055
2056 if (IS_ERR(rdev))
2057 return PTR_ERR(rdev);
2058 err = bind_rdev_to_array(rdev, mddev);
2059 out:
2060 if (err)
2061 export_rdev(rdev);
2062 return err ? err : len;
2063}
2064
2065static struct md_sysfs_entry md_new_device =
2066__ATTR(new_dev, 0200, null_show, new_dev_store);
3b34380a 2067
a35b0d69
N		 2068static ssize_t
2069size_show(mddev_t *mddev, char *page)
2070{
2071 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2072}
2073
2074static int update_size(mddev_t *mddev, unsigned long size);
2075
2076static ssize_t
2077size_store(mddev_t *mddev, const char *buf, size_t len)
2078{
2079 /* If array is inactive, we can reduce the component size, but
2080 * not increase it (except from 0).
2081 * If array is active, we can try an on-line resize
2082 */
2083 char *e;
2084 int err = 0;
2085 unsigned long long size = simple_strtoull(buf, &e, 10);
2086 if (!*buf || *buf == '\n' ||
2087 (*e && *e != '\n'))
2088 return -EINVAL;
2089
2090 if (mddev->pers) {
2091 err = update_size(mddev, size);
2092 md_update_sb(mddev);
2093 } else {
2094 if (mddev->size == 0 ||
2095 mddev->size > size)
2096 mddev->size = size;
2097 else
2098 err = -ENOSPC;
2099 }
2100 return err ? err : len;
2101}
2102
2103static struct md_sysfs_entry md_size =
2104__ATTR(component_size, 0644, size_show, size_store);
2105
8bb93aac
N		 2106
2107/* Metdata version.
2108 * This is either 'none' for arrays with externally managed metadata,
2109 * or N.M for internally known formats
2110 */
2111static ssize_t
2112metadata_show(mddev_t *mddev, char *page)
2113{
2114 if (mddev->persistent)
2115 return sprintf(page, "%d.%d\n",
2116 mddev->major_version, mddev->minor_version);
2117 else
2118 return sprintf(page, "none\n");
2119}
2120
2121static ssize_t
2122metadata_store(mddev_t *mddev, const char *buf, size_t len)
2123{
2124 int major, minor;
2125 char *e;
2126 if (!list_empty(&mddev->disks))
2127 return -EBUSY;
2128
2129 if (cmd_match(buf, "none")) {
2130 mddev->persistent = 0;
2131 mddev->major_version = 0;
2132 mddev->minor_version = 90;
2133 return len;
2134 }
2135 major = simple_strtoul(buf, &e, 10);
2136 if (e==buf || *e != '.')
2137 return -EINVAL;
2138 buf = e+1;
2139 minor = simple_strtoul(buf, &e, 10);
2140 if (e==buf || *e != '\n')
2141 return -EINVAL;
2142 if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
2143 super_types[major].name == NULL)
2144 return -ENOENT;
2145 mddev->major_version = major;
2146 mddev->minor_version = minor;
2147 mddev->persistent = 1;
2148 return len;
2149}
2150
2151static struct md_sysfs_entry md_metadata =
2152__ATTR(metadata_version, 0644, metadata_show, metadata_store);
2153
24dd469d 2154static ssize_t
7eec314d 2155action_show(mddev_t *mddev, char *page)
24dd469d 2156{
7eec314d 2157 char *type = "idle";
31399d9e
N		 2158 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2159 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
2160 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N		 2161 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2162 type = "resync";
2163 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2164 type = "check";
2165 else
2166 type = "repair";
2167 } else
2168 type = "recover";
2169 }
2170 return sprintf(page, "%s\n", type);
2171}
2172
2173static ssize_t
7eec314d 2174action_store(mddev_t *mddev, const char *page, size_t len)
24dd469d 2175{
7eec314d
N		 2176 if (!mddev->pers || !mddev->pers->sync_request)
2177 return -EINVAL;
2178
bce74dac 2179 if (cmd_match(page, "idle")) {
7eec314d
N		 2180 if (mddev->sync_thread) {
2181 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2182 md_unregister_thread(mddev->sync_thread);
2183 mddev->sync_thread = NULL;
2184 mddev->recovery = 0;
2185 }
03c902e1
N		 2186 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2187 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 2188 return -EBUSY;
03c902e1 2189 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
7eec314d
N		 2190 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2191 else {
bce74dac 2192 if (cmd_match(page, "check"))
7eec314d 2193 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
bce74dac 2194 else if (cmd_match(page, "repair"))
7eec314d
N		 2195 return -EINVAL;
2196 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2197 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7eec314d 2198 }
03c902e1 2199 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d
N		 2200 md_wakeup_thread(mddev->thread);
2201 return len;
2202}
2203
9d88883e 2204static ssize_t
96de1e66 2205mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 2206{
2207 return sprintf(page, "%llu\n",
2208 (unsigned long long) mddev->resync_mismatches);
2209}
2210
96de1e66 2211static struct md_sysfs_entry
7eec314d 2212md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 2213
96de1e66
N		 2214
2215static struct md_sysfs_entry
2216md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 2217
88202a0c
N		 2218static ssize_t
2219sync_min_show(mddev_t *mddev, char *page)
2220{
2221 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2222 mddev->sync_speed_min ? "local": "system");
2223}
2224
2225static ssize_t
2226sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2227{
2228 int min;
2229 char *e;
2230 if (strncmp(buf, "system", 6)==0) {
2231 mddev->sync_speed_min = 0;
2232 return len;
2233 }
2234 min = simple_strtoul(buf, &e, 10);
2235 if (buf == e || (*e && *e != '\n') || min <= 0)
2236 return -EINVAL;
2237 mddev->sync_speed_min = min;
2238 return len;
2239}
2240
2241static struct md_sysfs_entry md_sync_min =
2242__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2243
2244static ssize_t
2245sync_max_show(mddev_t *mddev, char *page)
2246{
2247 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2248 mddev->sync_speed_max ? "local": "system");
2249}
2250
2251static ssize_t
2252sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2253{
2254 int max;
2255 char *e;
2256 if (strncmp(buf, "system", 6)==0) {
2257 mddev->sync_speed_max = 0;
2258 return len;
2259 }
2260 max = simple_strtoul(buf, &e, 10);
2261 if (buf == e || (*e && *e != '\n') || max <= 0)
2262 return -EINVAL;
2263 mddev->sync_speed_max = max;
2264 return len;
2265}
2266
2267static struct md_sysfs_entry md_sync_max =
2268__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2269
2270
2271static ssize_t
2272sync_speed_show(mddev_t *mddev, char *page)
2273{
2274 unsigned long resync, dt, db;
2275 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2276 dt = ((jiffies - mddev->resync_mark) / HZ);
2277 if (!dt) dt++;
2278 db = resync - (mddev->resync_mark_cnt);
2279 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2280}
2281
2282static struct md_sysfs_entry
2283md_sync_speed = __ATTR_RO(sync_speed);
2284
2285static ssize_t
2286sync_completed_show(mddev_t *mddev, char *page)
2287{
2288 unsigned long max_blocks, resync;
2289
2290 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2291 max_blocks = mddev->resync_max_sectors;
2292 else
2293 max_blocks = mddev->size << 1;
2294
2295 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2296 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2297}
2298
2299static struct md_sysfs_entry
2300md_sync_completed = __ATTR_RO(sync_completed);
2301
eae1701f
N		 2302static struct attribute *md_default_attrs[] = {
2303 &md_level.attr,
2304 &md_raid_disks.attr,
3b34380a 2305 &md_chunk_size.attr,
a35b0d69 2306 &md_size.attr,
8bb93aac 2307 &md_metadata.attr,
6d7ff738 2308 &md_new_device.attr,
411036fa
N		 2309 NULL,
2310};
2311
2312static struct attribute *md_redundancy_attrs[] = {
24dd469d 2313 &md_scan_mode.attr,
9d88883e 2314 &md_mismatches.attr,
88202a0c
N		 2315 &md_sync_min.attr,
2316 &md_sync_max.attr,
2317 &md_sync_speed.attr,
2318 &md_sync_completed.attr,
eae1701f
N		 2319 NULL,
2320};
411036fa
N		 2321static struct attribute_group md_redundancy_group = {
2322 .name = NULL,
2323 .attrs = md_redundancy_attrs,
2324};
2325
eae1701f
N		 2326
2327static ssize_t
2328md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2329{
2330 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2331 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2332 ssize_t rv;
eae1701f
N		 2333
2334 if (!entry->show)
2335 return -EIO;
96de1e66
N		 2336 mddev_lock(mddev);
2337 rv = entry->show(mddev, page);
2338 mddev_unlock(mddev);
2339 return rv;
eae1701f
N		 2340}
2341
2342static ssize_t
2343md_attr_store(struct kobject *kobj, struct attribute *attr,
2344 const char *page, size_t length)
2345{
2346 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2347 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2348 ssize_t rv;
eae1701f
N		 2349
2350 if (!entry->store)
2351 return -EIO;
96de1e66
N		 2352 mddev_lock(mddev);
2353 rv = entry->store(mddev, page, length);
2354 mddev_unlock(mddev);
2355 return rv;
eae1701f
N		 2356}
2357
2358static void md_free(struct kobject *ko)
2359{
2360 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2361 kfree(mddev);
2362}
2363
2364static struct sysfs_ops md_sysfs_ops = {
2365 .show = md_attr_show,
2366 .store = md_attr_store,
2367};
2368static struct kobj_type md_ktype = {
2369 .release = md_free,
2370 .sysfs_ops = &md_sysfs_ops,
2371 .default_attrs = md_default_attrs,
2372};
2373
1da177e4
LT		 2374int mdp_major = 0;
2375
2376static struct kobject *md_probe(dev_t dev, int *part, void *data)
2377{
2378 static DECLARE_MUTEX(disks_sem);
2379 mddev_t *mddev = mddev_find(dev);
2380 struct gendisk *disk;
2381 int partitioned = (MAJOR(dev) != MD_MAJOR);
2382 int shift = partitioned ? MdpMinorShift : 0;
2383 int unit = MINOR(dev) >> shift;
2384
2385 if (!mddev)
2386 return NULL;
2387
2388 down(&disks_sem);
2389 if (mddev->gendisk) {
2390 up(&disks_sem);
2391 mddev_put(mddev);
2392 return NULL;
2393 }
2394 disk = alloc_disk(1 << shift);
2395 if (!disk) {
2396 up(&disks_sem);
2397 mddev_put(mddev);
2398 return NULL;
2399 }
2400 disk->major = MAJOR(dev);
2401 disk->first_minor = unit << shift;
2402 if (partitioned) {
2403 sprintf(disk->disk_name, "md_d%d", unit);
2404 sprintf(disk->devfs_name, "md/d%d", unit);
2405 } else {
2406 sprintf(disk->disk_name, "md%d", unit);
2407 sprintf(disk->devfs_name, "md/%d", unit);
2408 }
2409 disk->fops = &md_fops;
2410 disk->private_data = mddev;
2411 disk->queue = mddev->queue;
2412 add_disk(disk);
2413 mddev->gendisk = disk;
2414 up(&disks_sem);
9c791977 2415 mddev->kobj.parent = &disk->kobj;
eae1701f
N		 2416 mddev->kobj.k_name = NULL;
2417 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
2418 mddev->kobj.ktype = &md_ktype;
2419 kobject_register(&mddev->kobj);
1da177e4
LT		 2420 return NULL;
2421}
2422
2423void md_wakeup_thread(mdk_thread_t *thread);
2424
2425static void md_safemode_timeout(unsigned long data)
2426{
2427 mddev_t *mddev = (mddev_t *) data;
2428
2429 mddev->safemode = 1;
2430 md_wakeup_thread(mddev->thread);
2431}
2432
6ff8d8ec 2433static int start_dirty_degraded;
1da177e4
LT		 2434
2435static int do_md_run(mddev_t * mddev)
2436{
2604b703 2437 int err;
1da177e4
LT		 2438 int chunk_size;
2439 struct list_head *tmp;
2440 mdk_rdev_t *rdev;
2441 struct gendisk *disk;
2604b703 2442 struct mdk_personality *pers;
1da177e4
LT		 2443 char b[BDEVNAME_SIZE];
2444
a757e64c
N		 2445 if (list_empty(&mddev->disks))
2446 /* cannot run an array with no devices.. */
1da177e4 2447 return -EINVAL;
1da177e4
LT		 2448
2449 if (mddev->pers)
2450 return -EBUSY;
2451
2452 /*
2453 * Analyze all RAID superblock(s)
2454 */
a757e64c
N		 2455 if (!mddev->raid_disks)
2456 analyze_sbs(mddev);
1da177e4
LT		 2457
2458 chunk_size = mddev->chunk_size;
2604b703
N		 2459
2460 if (chunk_size) {
1da177e4
LT		 2461 if (chunk_size > MAX_CHUNK_SIZE) {
2462 printk(KERN_ERR "too big chunk_size: %d > %d\n",
2463 chunk_size, MAX_CHUNK_SIZE);
2464 return -EINVAL;
2465 }
2466 /*
2467 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2468 */
2469 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 2470 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 2471 return -EINVAL;
2472 }
2473 if (chunk_size < PAGE_SIZE) {
2474 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
2475 chunk_size, PAGE_SIZE);
2476 return -EINVAL;
2477 }
2478
2479 /* devices must have minimum size of one chunk */
2480 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2481 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2482 continue;
2483 if (rdev->size < chunk_size / 1024) {
2484 printk(KERN_WARNING
2485 "md: Dev %s smaller than chunk_size:"
2486 " %lluk < %dk\n",
2487 bdevname(rdev->bdev,b),
2488 (unsigned long long)rdev->size,
2489 chunk_size / 1024);
2490 return -EINVAL;
2491 }
2492 }
2493 }
2494
1da177e4 2495#ifdef CONFIG_KMOD
d9d166c2
N		 2496 if (mddev->level != LEVEL_NONE)
2497 request_module("md-level-%d", mddev->level);
2498 else if (mddev->clevel[0])
2499 request_module("md-%s", mddev->clevel);
1da177e4
LT		 2500#endif
2501
2502 /*
2503 * Drop all container device buffers, from now on
2504 * the only valid external interface is through the md
2505 * device.
2506 * Also find largest hardsector size
2507 */
2508 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2509 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2510 continue;
2511 sync_blockdev(rdev->bdev);
2512 invalidate_bdev(rdev->bdev, 0);
2513 }
2514
2515 md_probe(mddev->unit, NULL, NULL);
2516 disk = mddev->gendisk;
2517 if (!disk)
2518 return -ENOMEM;
2519
2520 spin_lock(&pers_lock);
d9d166c2 2521 pers = find_pers(mddev->level, mddev->clevel);
2604b703 2522 if (!pers || !try_module_get(pers->owner)) {
1da177e4 2523 spin_unlock(&pers_lock);
d9d166c2
N		 2524 if (mddev->level != LEVEL_NONE)
2525 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
2526 mddev->level);
2527 else
2528 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
2529 mddev->clevel);
1da177e4
LT		 2530 return -EINVAL;
2531 }
2604b703 2532 mddev->pers = pers;
1da177e4 2533 spin_unlock(&pers_lock);
d9d166c2
N		 2534 mddev->level = pers->level;
2535 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
1da177e4 2536
657390d2 2537 mddev->recovery = 0;
1da177e4 2538 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 2539 mddev->barriers_work = 1;
6ff8d8ec 2540 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 2541
f91de92e
N		 2542 if (start_readonly)
2543 mddev->ro = 2; /* read-only, but switch on first write */
2544
b15c2e57
N		 2545 err = mddev->pers->run(mddev);
2546 if (!err && mddev->pers->sync_request) {
2547 err = bitmap_create(mddev);
2548 if (err) {
2549 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
2550 mdname(mddev), err);
2551 mddev->pers->stop(mddev);
2552 }
2553 }
1da177e4
LT		 2554 if (err) {
2555 printk(KERN_ERR "md: pers->run() failed ...\n");
2556 module_put(mddev->pers->owner);
2557 mddev->pers = NULL;
32a7627c
N		 2558 bitmap_destroy(mddev);
2559 return err;
1da177e4 2560 }
411036fa
N		 2561 if (mddev->pers->sync_request)
2562 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
fd9d49ca
N		 2563 else if (mddev->ro == 2) /* auto-readonly not meaningful */
2564 mddev->ro = 0;
2565
1da177e4
LT		 2566 atomic_set(&mddev->writes_pending,0);
2567 mddev->safemode = 0;
2568 mddev->safemode_timer.function = md_safemode_timeout;
2569 mddev->safemode_timer.data = (unsigned long) mddev;
2570 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */
2571 mddev->in_sync = 1;
86e6ffdd
N		 2572
2573 ITERATE_RDEV(mddev,rdev,tmp)
2574 if (rdev->raid_disk >= 0) {
2575 char nm[20];
2576 sprintf(nm, "rd%d", rdev->raid_disk);
2577 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2578 }
1da177e4
LT		 2579
2580 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 2581 md_wakeup_thread(mddev->thread);
1da177e4
LT		 2582
2583 if (mddev->sb_dirty)
2584 md_update_sb(mddev);
2585
2586 set_capacity(disk, mddev->array_size<<1);
2587
2588 /* If we call blk_queue_make_request here, it will
2589 * re-initialise max_sectors etc which may have been
2590 * refined inside -> run. So just set the bits we need to set.
2591 * Most initialisation happended when we called
2592 * blk_queue_make_request(..., md_fail_request)
2593 * earlier.
2594 */
2595 mddev->queue->queuedata = mddev;
2596 mddev->queue->make_request_fn = mddev->pers->make_request;
2597
2598 mddev->changed = 1;
d7603b7e 2599 md_new_event(mddev);
1da177e4
LT		 2600 return 0;
2601}
2602
2603static int restart_array(mddev_t *mddev)
2604{
2605 struct gendisk *disk = mddev->gendisk;
2606 int err;
2607
2608 /*
2609 * Complain if it has no devices
2610 */
2611 err = -ENXIO;
2612 if (list_empty(&mddev->disks))
2613 goto out;
2614
2615 if (mddev->pers) {
2616 err = -EBUSY;
2617 if (!mddev->ro)
2618 goto out;
2619
2620 mddev->safemode = 0;
2621 mddev->ro = 0;
2622 set_disk_ro(disk, 0);
2623
2624 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2625 mdname(mddev));
2626 /*
2627 * Kick recovery or resync if necessary
2628 */
2629 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2630 md_wakeup_thread(mddev->thread);
2631 err = 0;
2632 } else {
2633 printk(KERN_ERR "md: %s has no personality assigned.\n",
2634 mdname(mddev));
2635 err = -EINVAL;
2636 }
2637
2638out:
2639 return err;
2640}
2641
2642static int do_md_stop(mddev_t * mddev, int ro)
2643{
2644 int err = 0;
2645 struct gendisk *disk = mddev->gendisk;
2646
2647 if (mddev->pers) {
2648 if (atomic_read(&mddev->active)>2) {
2649 printk("md: %s still in use.\n",mdname(mddev));
2650 return -EBUSY;
2651 }
2652
2653 if (mddev->sync_thread) {
2654 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2655 md_unregister_thread(mddev->sync_thread);
2656 mddev->sync_thread = NULL;
2657 }
2658
2659 del_timer_sync(&mddev->safemode_timer);
2660
2661 invalidate_partition(disk, 0);
2662
2663 if (ro) {
2664 err = -ENXIO;
f91de92e 2665 if (mddev->ro==1)
1da177e4
LT		 2666 goto out;
2667 mddev->ro = 1;
2668 } else {
6b8b3e8a 2669 bitmap_flush(mddev);
a9701a30 2670 md_super_wait(mddev);
1da177e4
LT		 2671 if (mddev->ro)
2672 set_disk_ro(disk, 0);
2673 blk_queue_make_request(mddev->queue, md_fail_request);
2674 mddev->pers->stop(mddev);
411036fa
N		 2675 if (mddev->pers->sync_request)
2676 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
2677
1da177e4
LT		 2678 module_put(mddev->pers->owner);
2679 mddev->pers = NULL;
2680 if (mddev->ro)
2681 mddev->ro = 0;
2682 }
2683 if (!mddev->in_sync) {
2684 /* mark array as shutdown cleanly */
2685 mddev->in_sync = 1;
2686 md_update_sb(mddev);
2687 }
2688 if (ro)
2689 set_disk_ro(disk, 1);
2690 }
32a7627c 2691
1da177e4
LT		 2692 /*
2693 * Free resources if final stop
2694 */
2695 if (!ro) {
86e6ffdd
N		 2696 mdk_rdev_t *rdev;
2697 struct list_head *tmp;
1da177e4
LT		 2698 struct gendisk *disk;
2699 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
2700
978f946b
N		 2701 bitmap_destroy(mddev);
2702 if (mddev->bitmap_file) {
2703 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
2704 fput(mddev->bitmap_file);
2705 mddev->bitmap_file = NULL;
2706 }
2707 mddev->bitmap_offset = 0;
2708
86e6ffdd
N		 2709 ITERATE_RDEV(mddev,rdev,tmp)
2710 if (rdev->raid_disk >= 0) {
2711 char nm[20];
2712 sprintf(nm, "rd%d", rdev->raid_disk);
2713 sysfs_remove_link(&mddev->kobj, nm);
2714 }
2715
1da177e4
LT		 2716 export_array(mddev);
2717
2718 mddev->array_size = 0;
2719 disk = mddev->gendisk;
2720 if (disk)
2721 set_capacity(disk, 0);
2722 mddev->changed = 1;
2723 } else
2724 printk(KERN_INFO "md: %s switched to read-only mode.\n",
2725 mdname(mddev));
2726 err = 0;
d7603b7e 2727 md_new_event(mddev);
1da177e4
LT		 2728out:
2729 return err;
2730}
2731
2732static void autorun_array(mddev_t *mddev)
2733{
2734 mdk_rdev_t *rdev;
2735 struct list_head *tmp;
2736 int err;
2737
a757e64c 2738 if (list_empty(&mddev->disks))
1da177e4 2739 return;
1da177e4
LT		 2740
2741 printk(KERN_INFO "md: running: ");
2742
2743 ITERATE_RDEV(mddev,rdev,tmp) {
2744 char b[BDEVNAME_SIZE];
2745 printk("<%s>", bdevname(rdev->bdev,b));
2746 }
2747 printk("\n");
2748
2749 err = do_md_run (mddev);
2750 if (err) {
2751 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
2752 do_md_stop (mddev, 0);
2753 }
2754}
2755
2756/*
2757 * lets try to run arrays based on all disks that have arrived
2758 * until now. (those are in pending_raid_disks)
2759 *
2760 * the method: pick the first pending disk, collect all disks with
2761 * the same UUID, remove all from the pending list and put them into
2762 * the 'same_array' list. Then order this list based on superblock
2763 * update time (freshest comes first), kick out 'old' disks and
2764 * compare superblocks. If everything's fine then run it.
2765 *
2766 * If "unit" is allocated, then bump its reference count
2767 */
2768static void autorun_devices(int part)
2769{
2770 struct list_head candidates;
2771 struct list_head *tmp;
2772 mdk_rdev_t *rdev0, *rdev;
2773 mddev_t *mddev;
2774 char b[BDEVNAME_SIZE];
2775
2776 printk(KERN_INFO "md: autorun ...\n");
2777 while (!list_empty(&pending_raid_disks)) {
2778 dev_t dev;
2779 rdev0 = list_entry(pending_raid_disks.next,
2780 mdk_rdev_t, same_set);
2781
2782 printk(KERN_INFO "md: considering %s ...\n",
2783 bdevname(rdev0->bdev,b));
2784 INIT_LIST_HEAD(&candidates);
2785 ITERATE_RDEV_PENDING(rdev,tmp)
2786 if (super_90_load(rdev, rdev0, 0) >= 0) {
2787 printk(KERN_INFO "md: adding %s ...\n",
2788 bdevname(rdev->bdev,b));
2789 list_move(&rdev->same_set, &candidates);
2790 }
2791 /*
2792 * now we have a set of devices, with all of them having
2793 * mostly sane superblocks. It's time to allocate the
2794 * mddev.
2795 */
2796 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
2797 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
2798 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
2799 break;
2800 }
2801 if (part)
2802 dev = MKDEV(mdp_major,
2803 rdev0->preferred_minor << MdpMinorShift);
2804 else
2805 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
2806
2807 md_probe(dev, NULL, NULL);
2808 mddev = mddev_find(dev);
2809 if (!mddev) {
2810 printk(KERN_ERR
2811 "md: cannot allocate memory for md drive.\n");
2812 break;
2813 }
2814 if (mddev_lock(mddev))
2815 printk(KERN_WARNING "md: %s locked, cannot run\n",
2816 mdname(mddev));
2817 else if (mddev->raid_disks || mddev->major_version
2818 || !list_empty(&mddev->disks)) {
2819 printk(KERN_WARNING
2820 "md: %s already running, cannot run %s\n",
2821 mdname(mddev), bdevname(rdev0->bdev,b));
2822 mddev_unlock(mddev);
2823 } else {
2824 printk(KERN_INFO "md: created %s\n", mdname(mddev));
2825 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
2826 list_del_init(&rdev->same_set);
2827 if (bind_rdev_to_array(rdev, mddev))
2828 export_rdev(rdev);
2829 }
2830 autorun_array(mddev);
2831 mddev_unlock(mddev);
2832 }
2833 /* on success, candidates will be empty, on error
2834 * it won't...
2835 */
2836 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
2837 export_rdev(rdev);
2838 mddev_put(mddev);
2839 }
2840 printk(KERN_INFO "md: ... autorun DONE.\n");
2841}
2842
2843/*
2844 * import RAID devices based on one partition
2845 * if possible, the array gets run as well.
2846 */
2847
2848static int autostart_array(dev_t startdev)
2849{
2850 char b[BDEVNAME_SIZE];
2851 int err = -EINVAL, i;
2852 mdp_super_t *sb = NULL;
2853 mdk_rdev_t *start_rdev = NULL, *rdev;
2854
2855 start_rdev = md_import_device(startdev, 0, 0);
2856 if (IS_ERR(start_rdev))
2857 return err;
2858
2859
2860 /* NOTE: this can only work for 0.90.0 superblocks */
2861 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
2862 if (sb->major_version != 0 ||
2863 sb->minor_version != 90 ) {
2864 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
2865 export_rdev(start_rdev);
2866 return err;
2867 }
2868
b2d444d7 2869 if (test_bit(Faulty, &start_rdev->flags)) {
1da177e4
LT		 2870 printk(KERN_WARNING
2871 "md: can not autostart based on faulty %s!\n",
2872 bdevname(start_rdev->bdev,b));
2873 export_rdev(start_rdev);
2874 return err;
2875 }
2876 list_add(&start_rdev->same_set, &pending_raid_disks);
2877
2878 for (i = 0; i < MD_SB_DISKS; i++) {
2879 mdp_disk_t *desc = sb->disks + i;
2880 dev_t dev = MKDEV(desc->major, desc->minor);
2881
2882 if (!dev)
2883 continue;
2884 if (dev == startdev)
2885 continue;
2886 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
2887 continue;
2888 rdev = md_import_device(dev, 0, 0);
2889 if (IS_ERR(rdev))
2890 continue;
2891
2892 list_add(&rdev->same_set, &pending_raid_disks);
2893 }
2894
2895 /*
2896 * possibly return codes
2897 */
2898 autorun_devices(0);
2899 return 0;
2900
2901}
2902
2903
2904static int get_version(void __user * arg)
2905{
2906 mdu_version_t ver;
2907
2908 ver.major = MD_MAJOR_VERSION;
2909 ver.minor = MD_MINOR_VERSION;
2910 ver.patchlevel = MD_PATCHLEVEL_VERSION;
2911
2912 if (copy_to_user(arg, &ver, sizeof(ver)))
2913 return -EFAULT;
2914
2915 return 0;
2916}
2917
2918static int get_array_info(mddev_t * mddev, void __user * arg)
2919{
2920 mdu_array_info_t info;
2921 int nr,working,active,failed,spare;
2922 mdk_rdev_t *rdev;
2923 struct list_head *tmp;
2924
2925 nr=working=active=failed=spare=0;
2926 ITERATE_RDEV(mddev,rdev,tmp) {
2927 nr++;
b2d444d7 2928 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2929 failed++;
2930 else {
2931 working++;
b2d444d7 2932 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 2933 active++;
2934 else
2935 spare++;
2936 }
2937 }
2938
2939 info.major_version = mddev->major_version;
2940 info.minor_version = mddev->minor_version;
2941 info.patch_version = MD_PATCHLEVEL_VERSION;
2942 info.ctime = mddev->ctime;
2943 info.level = mddev->level;
2944 info.size = mddev->size;
2945 info.nr_disks = nr;
2946 info.raid_disks = mddev->raid_disks;
2947 info.md_minor = mddev->md_minor;
2948 info.not_persistent= !mddev->persistent;
2949
2950 info.utime = mddev->utime;
2951 info.state = 0;
2952 if (mddev->in_sync)
2953 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 2954 if (mddev->bitmap && mddev->bitmap_offset)
2955 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 2956 info.active_disks = active;
2957 info.working_disks = working;
2958 info.failed_disks = failed;
2959 info.spare_disks = spare;
2960
2961 info.layout = mddev->layout;
2962 info.chunk_size = mddev->chunk_size;
2963
2964 if (copy_to_user(arg, &info, sizeof(info)))
2965 return -EFAULT;
2966
2967 return 0;
2968}
2969
87162a28 2970static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 2971{
2972 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
2973 char *ptr, *buf = NULL;
2974 int err = -ENOMEM;
2975
2976 file = kmalloc(sizeof(*file), GFP_KERNEL);
2977 if (!file)
2978 goto out;
2979
2980 /* bitmap disabled, zero the first byte and copy out */
2981 if (!mddev->bitmap || !mddev->bitmap->file) {
2982 file->pathname[0] = '\0';
2983 goto copy_out;
2984 }
2985
2986 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
2987 if (!buf)
2988 goto out;
2989
2990 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
2991 if (!ptr)
2992 goto out;
2993
2994 strcpy(file->pathname, ptr);
2995
2996copy_out:
2997 err = 0;
2998 if (copy_to_user(arg, file, sizeof(*file)))
2999 err = -EFAULT;
3000out:
3001 kfree(buf);
3002 kfree(file);
3003 return err;
3004}
3005
1da177e4
LT		 3006static int get_disk_info(mddev_t * mddev, void __user * arg)
3007{
3008 mdu_disk_info_t info;
3009 unsigned int nr;
3010 mdk_rdev_t *rdev;
3011
3012 if (copy_from_user(&info, arg, sizeof(info)))
3013 return -EFAULT;
3014
3015 nr = info.number;
3016
3017 rdev = find_rdev_nr(mddev, nr);
3018 if (rdev) {
3019 info.major = MAJOR(rdev->bdev->bd_dev);
3020 info.minor = MINOR(rdev->bdev->bd_dev);
3021 info.raid_disk = rdev->raid_disk;
3022 info.state = 0;
b2d444d7 3023 if (test_bit(Faulty, &rdev->flags))
1da177e4 3024 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 3025 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 3026 info.state |= (1<<MD_DISK_ACTIVE);
3027 info.state |= (1<<MD_DISK_SYNC);
3028 }
8ddf9efe
N		 3029 if (test_bit(WriteMostly, &rdev->flags))
3030 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 3031 } else {
3032 info.major = info.minor = 0;
3033 info.raid_disk = -1;
3034 info.state = (1<<MD_DISK_REMOVED);
3035 }
3036
3037 if (copy_to_user(arg, &info, sizeof(info)))
3038 return -EFAULT;
3039
3040 return 0;
3041}
3042
3043static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3044{
3045 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3046 mdk_rdev_t *rdev;
3047 dev_t dev = MKDEV(info->major,info->minor);
3048
3049 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3050 return -EOVERFLOW;
3051
3052 if (!mddev->raid_disks) {
3053 int err;
3054 /* expecting a device which has a superblock */
3055 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3056 if (IS_ERR(rdev)) {
3057 printk(KERN_WARNING
3058 "md: md_import_device returned %ld\n",
3059 PTR_ERR(rdev));
3060 return PTR_ERR(rdev);
3061 }
3062 if (!list_empty(&mddev->disks)) {
3063 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3064 mdk_rdev_t, same_set);
3065 int err = super_types[mddev->major_version]
3066 .load_super(rdev, rdev0, mddev->minor_version);
3067 if (err < 0) {
3068 printk(KERN_WARNING
3069 "md: %s has different UUID to %s\n",
3070 bdevname(rdev->bdev,b),
3071 bdevname(rdev0->bdev,b2));
3072 export_rdev(rdev);
3073 return -EINVAL;
3074 }
3075 }
3076 err = bind_rdev_to_array(rdev, mddev);
3077 if (err)
3078 export_rdev(rdev);
3079 return err;
3080 }
3081
3082 /*
3083 * add_new_disk can be used once the array is assembled
3084 * to add "hot spares". They must already have a superblock
3085 * written
3086 */
3087 if (mddev->pers) {
3088 int err;
3089 if (!mddev->pers->hot_add_disk) {
3090 printk(KERN_WARNING
3091 "%s: personality does not support diskops!\n",
3092 mdname(mddev));
3093 return -EINVAL;
3094 }
7b1e35f6
N		 3095 if (mddev->persistent)
3096 rdev = md_import_device(dev, mddev->major_version,
3097 mddev->minor_version);
3098 else
3099 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 3100 if (IS_ERR(rdev)) {
3101 printk(KERN_WARNING
3102 "md: md_import_device returned %ld\n",
3103 PTR_ERR(rdev));
3104 return PTR_ERR(rdev);
3105 }
41158c7e
N		 3106 /* set save_raid_disk if appropriate */
3107 if (!mddev->persistent) {
3108 if (info->state & (1<<MD_DISK_SYNC) &&
3109 info->raid_disk < mddev->raid_disks)
3110 rdev->raid_disk = info->raid_disk;
3111 else
3112 rdev->raid_disk = -1;
3113 } else
3114 super_types[mddev->major_version].
3115 validate_super(mddev, rdev);
3116 rdev->saved_raid_disk = rdev->raid_disk;
3117
b2d444d7 3118 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 3119 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3120 set_bit(WriteMostly, &rdev->flags);
3121
1da177e4
LT		 3122 rdev->raid_disk = -1;
3123 err = bind_rdev_to_array(rdev, mddev);
3124 if (err)
3125 export_rdev(rdev);
c361777f
N		 3126
3127 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 3128 md_wakeup_thread(mddev->thread);
1da177e4
LT		 3129 return err;
3130 }
3131
3132 /* otherwise, add_new_disk is only allowed
3133 * for major_version==0 superblocks
3134 */
3135 if (mddev->major_version != 0) {
3136 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3137 mdname(mddev));
3138 return -EINVAL;
3139 }
3140
3141 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3142 int err;
3143 rdev = md_import_device (dev, -1, 0);
3144 if (IS_ERR(rdev)) {
3145 printk(KERN_WARNING
3146 "md: error, md_import_device() returned %ld\n",
3147 PTR_ERR(rdev));
3148 return PTR_ERR(rdev);
3149 }
3150 rdev->desc_nr = info->number;
3151 if (info->raid_disk < mddev->raid_disks)
3152 rdev->raid_disk = info->raid_disk;
3153 else
3154 rdev->raid_disk = -1;
3155
b2d444d7
N		 3156 rdev->flags = 0;
3157
1da177e4 3158 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 3159 if (info->state & (1<<MD_DISK_SYNC))
3160 set_bit(In_sync, &rdev->flags);
1da177e4 3161
8ddf9efe
N		 3162 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3163 set_bit(WriteMostly, &rdev->flags);
3164
1da177e4
LT		 3165 if (!mddev->persistent) {
3166 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3167 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3168 } else
3169 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3170 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3171
2bf071bf
N		 3172 err = bind_rdev_to_array(rdev, mddev);
3173 if (err) {
3174 export_rdev(rdev);
3175 return err;
3176 }
1da177e4
LT		 3177 }
3178
3179 return 0;
3180}
3181
3182static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3183{
3184 char b[BDEVNAME_SIZE];
3185 mdk_rdev_t *rdev;
3186
3187 if (!mddev->pers)
3188 return -ENODEV;
3189
3190 rdev = find_rdev(mddev, dev);
3191 if (!rdev)
3192 return -ENXIO;
3193
3194 if (rdev->raid_disk >= 0)
3195 goto busy;
3196
3197 kick_rdev_from_array(rdev);
3198 md_update_sb(mddev);
d7603b7e 3199 md_new_event(mddev);
1da177e4
LT		 3200
3201 return 0;
3202busy:
3203 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3204 bdevname(rdev->bdev,b), mdname(mddev));
3205 return -EBUSY;
3206}
3207
3208static int hot_add_disk(mddev_t * mddev, dev_t dev)
3209{
3210 char b[BDEVNAME_SIZE];
3211 int err;
3212 unsigned int size;
3213 mdk_rdev_t *rdev;
3214
3215 if (!mddev->pers)
3216 return -ENODEV;
3217
3218 if (mddev->major_version != 0) {
3219 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3220 " version-0 superblocks.\n",
3221 mdname(mddev));
3222 return -EINVAL;
3223 }
3224 if (!mddev->pers->hot_add_disk) {
3225 printk(KERN_WARNING
3226 "%s: personality does not support diskops!\n",
3227 mdname(mddev));
3228 return -EINVAL;
3229 }
3230
3231 rdev = md_import_device (dev, -1, 0);
3232 if (IS_ERR(rdev)) {
3233 printk(KERN_WARNING
3234 "md: error, md_import_device() returned %ld\n",
3235 PTR_ERR(rdev));
3236 return -EINVAL;
3237 }
3238
3239 if (mddev->persistent)
3240 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3241 else
3242 rdev->sb_offset =
3243 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3244
3245 size = calc_dev_size(rdev, mddev->chunk_size);
3246 rdev->size = size;
3247
b2d444d7 3248 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 3249 printk(KERN_WARNING
3250 "md: can not hot-add faulty %s disk to %s!\n",
3251 bdevname(rdev->bdev,b), mdname(mddev));
3252 err = -EINVAL;
3253 goto abort_export;
3254 }
b2d444d7 3255 clear_bit(In_sync, &rdev->flags);
1da177e4 3256 rdev->desc_nr = -1;
2bf071bf
N		 3257 err = bind_rdev_to_array(rdev, mddev);
3258 if (err)
3259 goto abort_export;
1da177e4
LT		 3260
3261 /*
3262 * The rest should better be atomic, we can have disk failures
3263 * noticed in interrupt contexts ...
3264 */
3265
3266 if (rdev->desc_nr == mddev->max_disks) {
3267 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
3268 mdname(mddev));
3269 err = -EBUSY;
3270 goto abort_unbind_export;
3271 }
3272
3273 rdev->raid_disk = -1;
3274
3275 md_update_sb(mddev);
3276
3277 /*
3278 * Kick recovery, maybe this spare has to be added to the
3279 * array immediately.
3280 */
3281 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3282 md_wakeup_thread(mddev->thread);
d7603b7e 3283 md_new_event(mddev);
1da177e4
LT		 3284 return 0;
3285
3286abort_unbind_export:
3287 unbind_rdev_from_array(rdev);
3288
3289abort_export:
3290 export_rdev(rdev);
3291 return err;
3292}
3293
32a7627c
N		 3294/* similar to deny_write_access, but accounts for our holding a reference
3295 * to the file ourselves */
3296static int deny_bitmap_write_access(struct file * file)
3297{
3298 struct inode *inode = file->f_mapping->host;
3299
3300 spin_lock(&inode->i_lock);
3301 if (atomic_read(&inode->i_writecount) > 1) {
3302 spin_unlock(&inode->i_lock);
3303 return -ETXTBSY;
3304 }
3305 atomic_set(&inode->i_writecount, -1);
3306 spin_unlock(&inode->i_lock);
3307
3308 return 0;
3309}
3310
3311static int set_bitmap_file(mddev_t *mddev, int fd)
3312{
3313 int err;
3314
36fa3063
N		 3315 if (mddev->pers) {
3316 if (!mddev->pers->quiesce)
3317 return -EBUSY;
3318 if (mddev->recovery || mddev->sync_thread)
3319 return -EBUSY;
3320 /* we should be able to change the bitmap.. */
3321 }
32a7627c 3322
32a7627c 3323
36fa3063
N		 3324 if (fd >= 0) {
3325 if (mddev->bitmap)
3326 return -EEXIST; /* cannot add when bitmap is present */
3327 mddev->bitmap_file = fget(fd);
32a7627c 3328
36fa3063
N		 3329 if (mddev->bitmap_file == NULL) {
3330 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
3331 mdname(mddev));
3332 return -EBADF;
3333 }
3334
3335 err = deny_bitmap_write_access(mddev->bitmap_file);
3336 if (err) {
3337 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
3338 mdname(mddev));
3339 fput(mddev->bitmap_file);
3340 mddev->bitmap_file = NULL;
3341 return err;
3342 }
a654b9d8 3343 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 3344 } else if (mddev->bitmap == NULL)
3345 return -ENOENT; /* cannot remove what isn't there */
3346 err = 0;
3347 if (mddev->pers) {
3348 mddev->pers->quiesce(mddev, 1);
3349 if (fd >= 0)
3350 err = bitmap_create(mddev);
3351 if (fd < 0 || err)
3352 bitmap_destroy(mddev);
3353 mddev->pers->quiesce(mddev, 0);
3354 } else if (fd < 0) {
3355 if (mddev->bitmap_file)
3356 fput(mddev->bitmap_file);
3357 mddev->bitmap_file = NULL;
3358 }
3359
32a7627c
N		 3360 return err;
3361}
3362
1da177e4
LT		 3363/*
3364 * set_array_info is used two different ways
3365 * The original usage is when creating a new array.
3366 * In this usage, raid_disks is > 0 and it together with
3367 * level, size, not_persistent,layout,chunksize determine the
3368 * shape of the array.
3369 * This will always create an array with a type-0.90.0 superblock.
3370 * The newer usage is when assembling an array.
3371 * In this case raid_disks will be 0, and the major_version field is
3372 * use to determine which style super-blocks are to be found on the devices.
3373 * The minor and patch _version numbers are also kept incase the
3374 * super_block handler wishes to interpret them.
3375 */
3376static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
3377{
3378
3379 if (info->raid_disks == 0) {
3380 /* just setting version number for superblock loading */
3381 if (info->major_version < 0 ||
3382 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
3383 super_types[info->major_version].name == NULL) {
3384 /* maybe try to auto-load a module? */
3385 printk(KERN_INFO
3386 "md: superblock version %d not known\n",
3387 info->major_version);
3388 return -EINVAL;
3389 }
3390 mddev->major_version = info->major_version;
3391 mddev->minor_version = info->minor_version;
3392 mddev->patch_version = info->patch_version;
3393 return 0;
3394 }
3395 mddev->major_version = MD_MAJOR_VERSION;
3396 mddev->minor_version = MD_MINOR_VERSION;
3397 mddev->patch_version = MD_PATCHLEVEL_VERSION;
3398 mddev->ctime = get_seconds();
3399
3400 mddev->level = info->level;
17115e03 3401 mddev->clevel[0] = 0;
1da177e4
LT		 3402 mddev->size = info->size;
3403 mddev->raid_disks = info->raid_disks;
3404 /* don't set md_minor, it is determined by which /dev/md* was
3405 * openned
3406 */
3407 if (info->state & (1<<MD_SB_CLEAN))
3408 mddev->recovery_cp = MaxSector;
3409 else
3410 mddev->recovery_cp = 0;
3411 mddev->persistent = ! info->not_persistent;
3412
3413 mddev->layout = info->layout;
3414 mddev->chunk_size = info->chunk_size;
3415
3416 mddev->max_disks = MD_SB_DISKS;
3417
3418 mddev->sb_dirty = 1;
3419
b2a2703c
N		 3420 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
3421 mddev->bitmap_offset = 0;
3422
1da177e4
LT		 3423 /*
3424 * Generate a 128 bit UUID
3425 */
3426 get_random_bytes(mddev->uuid, 16);
3427
3428 return 0;
3429}
3430
a35b0d69
N		 3431static int update_size(mddev_t *mddev, unsigned long size)
3432{
3433 mdk_rdev_t * rdev;
3434 int rv;
3435 struct list_head *tmp;
3436
3437 if (mddev->pers->resize == NULL)
3438 return -EINVAL;
3439 /* The "size" is the amount of each device that is used.
3440 * This can only make sense for arrays with redundancy.
3441 * linear and raid0 always use whatever space is available
3442 * We can only consider changing the size if no resync
3443 * or reconstruction is happening, and if the new size
3444 * is acceptable. It must fit before the sb_offset or,
3445 * if that is <data_offset, it must fit before the
3446 * size of each device.
3447 * If size is zero, we find the largest size that fits.
3448 */
3449 if (mddev->sync_thread)
3450 return -EBUSY;
3451 ITERATE_RDEV(mddev,rdev,tmp) {
3452 sector_t avail;
3453 int fit = (size == 0);
3454 if (rdev->sb_offset > rdev->data_offset)
3455 avail = (rdev->sb_offset*2) - rdev->data_offset;
3456 else
3457 avail = get_capacity(rdev->bdev->bd_disk)
3458 - rdev->data_offset;
3459 if (fit && (size == 0 || size > avail/2))
3460 size = avail/2;
3461 if (avail < ((sector_t)size << 1))
3462 return -ENOSPC;
3463 }
3464 rv = mddev->pers->resize(mddev, (sector_t)size *2);
3465 if (!rv) {
3466 struct block_device *bdev;
3467
3468 bdev = bdget_disk(mddev->gendisk, 0);
3469 if (bdev) {
1b1dcc1b 3470 mutex_lock(&bdev->bd_inode->i_mutex);
6d89332b 3471 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
1b1dcc1b 3472 mutex_unlock(&bdev->bd_inode->i_mutex);
a35b0d69
N		 3473 bdput(bdev);
3474 }
3475 }
3476 return rv;
3477}
3478
da943b99
N		 3479static int update_raid_disks(mddev_t *mddev, int raid_disks)
3480{
3481 int rv;
3482 /* change the number of raid disks */
3483 if (mddev->pers->reshape == NULL)
3484 return -EINVAL;
3485 if (raid_disks <= 0 ||
3486 raid_disks >= mddev->max_disks)
3487 return -EINVAL;
3488 if (mddev->sync_thread)
3489 return -EBUSY;
3490 rv = mddev->pers->reshape(mddev, raid_disks);
da943b99
N		 3491 return rv;
3492}
3493
3494
1da177e4
LT		 3495/*
3496 * update_array_info is used to change the configuration of an
3497 * on-line array.
3498 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
3499 * fields in the info are checked against the array.
3500 * Any differences that cannot be handled will cause an error.
3501 * Normally, only one change can be managed at a time.
3502 */
3503static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
3504{
3505 int rv = 0;
3506 int cnt = 0;
36fa3063
N		 3507 int state = 0;
3508
3509 /* calculate expected state,ignoring low bits */
3510 if (mddev->bitmap && mddev->bitmap_offset)
3511 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 3512
3513 if (mddev->major_version != info->major_version ||
3514 mddev->minor_version != info->minor_version ||
3515/* mddev->patch_version != info->patch_version || */
3516 mddev->ctime != info->ctime ||
3517 mddev->level != info->level ||
3518/* mddev->layout != info->layout || */
3519 !mddev->persistent != info->not_persistent||
36fa3063
N		 3520 mddev->chunk_size != info->chunk_size ||
3521 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
3522 ((state^info->state) & 0xfffffe00)
3523 )
1da177e4
LT		 3524 return -EINVAL;
3525 /* Check there is only one change */
3526 if (mddev->size != info->size) cnt++;
3527 if (mddev->raid_disks != info->raid_disks) cnt++;
3528 if (mddev->layout != info->layout) cnt++;
36fa3063 3529 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 3530 if (cnt == 0) return 0;
3531 if (cnt > 1) return -EINVAL;
3532
3533 if (mddev->layout != info->layout) {
3534 /* Change layout
3535 * we don't need to do anything at the md level, the
3536 * personality will take care of it all.
3537 */
3538 if (mddev->pers->reconfig == NULL)
3539 return -EINVAL;
3540 else
3541 return mddev->pers->reconfig(mddev, info->layout, -1);
3542 }
a35b0d69
N		 3543 if (mddev->size != info->size)
3544 rv = update_size(mddev, info->size);
3545
da943b99
N		 3546 if (mddev->raid_disks != info->raid_disks)
3547 rv = update_raid_disks(mddev, info->raid_disks);
3548
36fa3063
N		 3549 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
3550 if (mddev->pers->quiesce == NULL)
3551 return -EINVAL;
3552 if (mddev->recovery || mddev->sync_thread)
3553 return -EBUSY;
3554 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
3555 /* add the bitmap */
3556 if (mddev->bitmap)
3557 return -EEXIST;
3558 if (mddev->default_bitmap_offset == 0)
3559 return -EINVAL;
3560 mddev->bitmap_offset = mddev->default_bitmap_offset;
3561 mddev->pers->quiesce(mddev, 1);
3562 rv = bitmap_create(mddev);
3563 if (rv)
3564 bitmap_destroy(mddev);
3565 mddev->pers->quiesce(mddev, 0);
3566 } else {
3567 /* remove the bitmap */
3568 if (!mddev->bitmap)
3569 return -ENOENT;
3570 if (mddev->bitmap->file)
3571 return -EINVAL;
3572 mddev->pers->quiesce(mddev, 1);
3573 bitmap_destroy(mddev);
3574 mddev->pers->quiesce(mddev, 0);
3575 mddev->bitmap_offset = 0;
3576 }
3577 }
1da177e4
LT		 3578 md_update_sb(mddev);
3579 return rv;
3580}
3581
3582static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3583{
3584 mdk_rdev_t *rdev;
3585
3586 if (mddev->pers == NULL)
3587 return -ENODEV;
3588
3589 rdev = find_rdev(mddev, dev);
3590 if (!rdev)
3591 return -ENODEV;
3592
3593 md_error(mddev, rdev);
3594 return 0;
3595}
3596
a885c8c4
CH		 3597static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3598{
3599 mddev_t *mddev = bdev->bd_disk->private_data;
3600
3601 geo->heads = 2;
3602 geo->sectors = 4;
3603 geo->cylinders = get_capacity(mddev->gendisk) / 8;
3604 return 0;
3605}
3606
1da177e4
LT		 3607static int md_ioctl(struct inode *inode, struct file *file,
3608 unsigned int cmd, unsigned long arg)
3609{
3610 int err = 0;
3611 void __user *argp = (void __user *)arg;
1da177e4
LT		 3612 mddev_t *mddev = NULL;
3613
3614 if (!capable(CAP_SYS_ADMIN))
3615 return -EACCES;
3616
3617 /*
3618 * Commands dealing with the RAID driver but not any
3619 * particular array:
3620 */
3621 switch (cmd)
3622 {
3623 case RAID_VERSION:
3624 err = get_version(argp);
3625 goto done;
3626
3627 case PRINT_RAID_DEBUG:
3628 err = 0;
3629 md_print_devices();
3630 goto done;
3631
3632#ifndef MODULE
3633 case RAID_AUTORUN:
3634 err = 0;
3635 autostart_arrays(arg);
3636 goto done;
3637#endif
3638 default:;
3639 }
3640
3641 /*
3642 * Commands creating/starting a new array:
3643 */
3644
3645 mddev = inode->i_bdev->bd_disk->private_data;
3646
3647 if (!mddev) {
3648 BUG();
3649 goto abort;
3650 }
3651
3652
3653 if (cmd == START_ARRAY) {
3654 /* START_ARRAY doesn't need to lock the array as autostart_array
3655 * does the locking, and it could even be a different array
3656 */
3657 static int cnt = 3;
3658 if (cnt > 0 ) {
3659 printk(KERN_WARNING
3660 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
e8a00334 3661 "This will not be supported beyond July 2006\n",
1da177e4
LT		 3662 current->comm, current->pid);
3663 cnt--;
3664 }
3665 err = autostart_array(new_decode_dev(arg));
3666 if (err) {
3667 printk(KERN_WARNING "md: autostart failed!\n");
3668 goto abort;
3669 }
3670 goto done;
3671 }
3672
3673 err = mddev_lock(mddev);
3674 if (err) {
3675 printk(KERN_INFO
3676 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3677 err, cmd);
3678 goto abort;
3679 }
3680
3681 switch (cmd)
3682 {
3683 case SET_ARRAY_INFO:
3684 {
3685 mdu_array_info_t info;
3686 if (!arg)
3687 memset(&info, 0, sizeof(info));
3688 else if (copy_from_user(&info, argp, sizeof(info))) {
3689 err = -EFAULT;
3690 goto abort_unlock;
3691 }
3692 if (mddev->pers) {
3693 err = update_array_info(mddev, &info);
3694 if (err) {
3695 printk(KERN_WARNING "md: couldn't update"
3696 " array info. %d\n", err);
3697 goto abort_unlock;
3698 }
3699 goto done_unlock;
3700 }
3701 if (!list_empty(&mddev->disks)) {
3702 printk(KERN_WARNING
3703 "md: array %s already has disks!\n",
3704 mdname(mddev));
3705 err = -EBUSY;
3706 goto abort_unlock;
3707 }
3708 if (mddev->raid_disks) {
3709 printk(KERN_WARNING
3710 "md: array %s already initialised!\n",
3711 mdname(mddev));
3712 err = -EBUSY;
3713 goto abort_unlock;
3714 }
3715 err = set_array_info(mddev, &info);
3716 if (err) {
3717 printk(KERN_WARNING "md: couldn't set"
3718 " array info. %d\n", err);
3719 goto abort_unlock;
3720 }
3721 }
3722 goto done_unlock;
3723
3724 default:;
3725 }
3726
3727 /*
3728 * Commands querying/configuring an existing array:
3729 */
32a7627c
N		 3730 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3731 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3732 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3733 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
1da177e4
LT		 3734 err = -ENODEV;
3735 goto abort_unlock;
3736 }
3737
3738 /*
3739 * Commands even a read-only array can execute:
3740 */
3741 switch (cmd)
3742 {
3743 case GET_ARRAY_INFO:
3744 err = get_array_info(mddev, argp);
3745 goto done_unlock;
3746
32a7627c 3747 case GET_BITMAP_FILE:
87162a28 3748 err = get_bitmap_file(mddev, argp);
32a7627c
N		 3749 goto done_unlock;
3750
1da177e4
LT		 3751 case GET_DISK_INFO:
3752 err = get_disk_info(mddev, argp);
3753 goto done_unlock;
3754
3755 case RESTART_ARRAY_RW:
3756 err = restart_array(mddev);
3757 goto done_unlock;
3758
3759 case STOP_ARRAY:
3760 err = do_md_stop (mddev, 0);
3761 goto done_unlock;
3762
3763 case STOP_ARRAY_RO:
3764 err = do_md_stop (mddev, 1);
3765 goto done_unlock;
3766
3767 /*
3768 * We have a problem here : there is no easy way to give a CHS
3769 * virtual geometry. We currently pretend that we have a 2 heads
3770 * 4 sectors (with a BIG number of cylinders...). This drives
3771 * dosfs just mad... ;-)
3772 */
1da177e4
LT		 3773 }
3774
3775 /*
3776 * The remaining ioctls are changing the state of the
f91de92e
N		 3777 * superblock, so we do not allow them on read-only arrays.
3778 * However non-MD ioctls (e.g. get-size) will still come through
3779 * here and hit the 'default' below, so only disallow
3780 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 3781 */
f91de92e
N		 3782 if (_IOC_TYPE(cmd) == MD_MAJOR &&
3783 mddev->ro && mddev->pers) {
3784 if (mddev->ro == 2) {
3785 mddev->ro = 0;
3786 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3787 md_wakeup_thread(mddev->thread);
3788
3789 } else {
3790 err = -EROFS;
3791 goto abort_unlock;
3792 }
1da177e4
LT		 3793 }
3794
3795 switch (cmd)
3796 {
3797 case ADD_NEW_DISK:
3798 {
3799 mdu_disk_info_t info;
3800 if (copy_from_user(&info, argp, sizeof(info)))
3801 err = -EFAULT;
3802 else
3803 err = add_new_disk(mddev, &info);
3804 goto done_unlock;
3805 }
3806
3807 case HOT_REMOVE_DISK:
3808 err = hot_remove_disk(mddev, new_decode_dev(arg));
3809 goto done_unlock;
3810
3811 case HOT_ADD_DISK:
3812 err = hot_add_disk(mddev, new_decode_dev(arg));
3813 goto done_unlock;
3814
3815 case SET_DISK_FAULTY:
3816 err = set_disk_faulty(mddev, new_decode_dev(arg));
3817 goto done_unlock;
3818
3819 case RUN_ARRAY:
3820 err = do_md_run (mddev);
3821 goto done_unlock;
3822
32a7627c
N		 3823 case SET_BITMAP_FILE:
3824 err = set_bitmap_file(mddev, (int)arg);
3825 goto done_unlock;
3826
1da177e4
LT		 3827 default:
3828 if (_IOC_TYPE(cmd) == MD_MAJOR)
3829 printk(KERN_WARNING "md: %s(pid %d) used"
3830 " obsolete MD ioctl, upgrade your"
3831 " software to use new ictls.\n",
3832 current->comm, current->pid);
3833 err = -EINVAL;
3834 goto abort_unlock;
3835 }
3836
3837done_unlock:
3838abort_unlock:
3839 mddev_unlock(mddev);
3840
3841 return err;
3842done:
3843 if (err)
3844 MD_BUG();
3845abort:
3846 return err;
3847}
3848
3849static int md_open(struct inode *inode, struct file *file)
3850{
3851 /*
3852 * Succeed if we can lock the mddev, which confirms that
3853 * it isn't being stopped right now.
3854 */
3855 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3856 int err;
3857
3858 if ((err = mddev_lock(mddev)))
3859 goto out;
3860
3861 err = 0;
3862 mddev_get(mddev);
3863 mddev_unlock(mddev);
3864
3865 check_disk_change(inode->i_bdev);
3866 out:
3867 return err;
3868}
3869
3870static int md_release(struct inode *inode, struct file * file)
3871{
3872 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3873
3874 if (!mddev)
3875 BUG();
3876 mddev_put(mddev);
3877
3878 return 0;
3879}
3880
3881static int md_media_changed(struct gendisk *disk)
3882{
3883 mddev_t *mddev = disk->private_data;
3884
3885 return mddev->changed;
3886}
3887
3888static int md_revalidate(struct gendisk *disk)
3889{
3890 mddev_t *mddev = disk->private_data;
3891
3892 mddev->changed = 0;
3893 return 0;
3894}
3895static struct block_device_operations md_fops =
3896{
3897 .owner = THIS_MODULE,
3898 .open = md_open,
3899 .release = md_release,
3900 .ioctl = md_ioctl,
a885c8c4 3901 .getgeo = md_getgeo,
1da177e4
LT		 3902 .media_changed = md_media_changed,
3903 .revalidate_disk= md_revalidate,
3904};
3905
75c96f85 3906static int md_thread(void * arg)
1da177e4
LT		 3907{
3908 mdk_thread_t *thread = arg;
3909
1da177e4
LT		 3910 /*
3911 * md_thread is a 'system-thread', it's priority should be very
3912 * high. We avoid resource deadlocks individually in each
3913 * raid personality. (RAID5 does preallocation) We also use RR and
3914 * the very same RT priority as kswapd, thus we will never get
3915 * into a priority inversion deadlock.
3916 *
3917 * we definitely have to have equal or higher priority than
3918 * bdflush, otherwise bdflush will deadlock if there are too
3919 * many dirty RAID5 blocks.
3920 */
1da177e4 3921
6985c43f 3922 allow_signal(SIGKILL);
a6fb0934 3923 while (!kthread_should_stop()) {
1da177e4 3924
93588e22
N		 3925 /* We need to wait INTERRUPTIBLE so that
3926 * we don't add to the load-average.
3927 * That means we need to be sure no signals are
3928 * pending
3929 */
3930 if (signal_pending(current))
3931 flush_signals(current);
3932
3933 wait_event_interruptible_timeout
3934 (thread->wqueue,
3935 test_bit(THREAD_WAKEUP, &thread->flags)
3936 || kthread_should_stop(),
3937 thread->timeout);
3e1d1d28 3938 try_to_freeze();
1da177e4
LT		 3939
3940 clear_bit(THREAD_WAKEUP, &thread->flags);
3941
787453c2 3942 thread->run(thread->mddev);
1da177e4 3943 }
a6fb0934 3944
1da177e4
LT		 3945 return 0;
3946}
3947
3948void md_wakeup_thread(mdk_thread_t *thread)
3949{
3950 if (thread) {
3951 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
3952 set_bit(THREAD_WAKEUP, &thread->flags);
3953 wake_up(&thread->wqueue);
3954 }
3955}
3956
3957mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
3958 const char *name)
3959{
3960 mdk_thread_t *thread;
1da177e4 3961
9ffae0cf 3962 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 3963 if (!thread)
3964 return NULL;
3965
1da177e4
LT		 3966 init_waitqueue_head(&thread->wqueue);
3967
1da177e4
LT		 3968 thread->run = run;
3969 thread->mddev = mddev;
32a7627c 3970 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 3971 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 3972 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 3973 kfree(thread);
3974 return NULL;
3975 }
1da177e4
LT		 3976 return thread;
3977}
3978
1da177e4
LT		 3979void md_unregister_thread(mdk_thread_t *thread)
3980{
d28446fe 3981 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
a6fb0934
N		 3982
3983 kthread_stop(thread->tsk);
1da177e4
LT		 3984 kfree(thread);
3985}
3986
3987void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
3988{
3989 if (!mddev) {
3990 MD_BUG();
3991 return;
3992 }
3993
b2d444d7 3994 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 3995 return;
32a7627c 3996/*
1da177e4
LT		 3997 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
3998 mdname(mddev),
3999 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4000 __builtin_return_address(0),__builtin_return_address(1),
4001 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 4002*/
1da177e4
LT		 4003 if (!mddev->pers->error_handler)
4004 return;
4005 mddev->pers->error_handler(mddev,rdev);
4006 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4007 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4008 md_wakeup_thread(mddev->thread);
d7603b7e 4009 md_new_event(mddev);
1da177e4
LT		 4010}
4011
4012/* seq_file implementation /proc/mdstat */
4013
4014static void status_unused(struct seq_file *seq)
4015{
4016 int i = 0;
4017 mdk_rdev_t *rdev;
4018 struct list_head *tmp;
4019
4020 seq_printf(seq, "unused devices: ");
4021
4022 ITERATE_RDEV_PENDING(rdev,tmp) {
4023 char b[BDEVNAME_SIZE];
4024 i++;
4025 seq_printf(seq, "%s ",
4026 bdevname(rdev->bdev,b));
4027 }
4028 if (!i)
4029 seq_printf(seq, "<none>");
4030
4031 seq_printf(seq, "\n");
4032}
4033
4034
4035static void status_resync(struct seq_file *seq, mddev_t * mddev)
4036{
4037 unsigned long max_blocks, resync, res, dt, db, rt;
4038
4039 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4040
4041 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4042 max_blocks = mddev->resync_max_sectors >> 1;
4043 else
4044 max_blocks = mddev->size;
4045
4046 /*
4047 * Should not happen.
4048 */
4049 if (!max_blocks) {
4050 MD_BUG();
4051 return;
4052 }
4053 res = (resync/1024)*1000/(max_blocks/1024 + 1);
4054 {
4055 int i, x = res/50, y = 20-x;
4056 seq_printf(seq, "[");
4057 for (i = 0; i < x; i++)
4058 seq_printf(seq, "=");
4059 seq_printf(seq, ">");
4060 for (i = 0; i < y; i++)
4061 seq_printf(seq, ".");
4062 seq_printf(seq, "] ");
4063 }
4064 seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)",
4065 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4066 "resync" : "recovery"),
4067 res/10, res % 10, resync, max_blocks);
4068
4069 /*
4070 * We do not want to overflow, so the order of operands and
4071 * the * 100 / 100 trick are important. We do a +1 to be
4072 * safe against division by zero. We only estimate anyway.
4073 *
4074 * dt: time from mark until now
4075 * db: blocks written from mark until now
4076 * rt: remaining time
4077 */
4078 dt = ((jiffies - mddev->resync_mark) / HZ);
4079 if (!dt) dt++;
4080 db = resync - (mddev->resync_mark_cnt/2);
4081 rt = (dt * ((max_blocks-resync) / (db/100+1)))/100;
4082
4083 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4084
4085 seq_printf(seq, " speed=%ldK/sec", db/dt);
4086}
4087
4088static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4089{
4090 struct list_head *tmp;
4091 loff_t l = *pos;
4092 mddev_t *mddev;
4093
4094 if (l >= 0x10000)
4095 return NULL;
4096 if (!l--)
4097 /* header */
4098 return (void*)1;
4099
4100 spin_lock(&all_mddevs_lock);
4101 list_for_each(tmp,&all_mddevs)
4102 if (!l--) {
4103 mddev = list_entry(tmp, mddev_t, all_mddevs);
4104 mddev_get(mddev);
4105 spin_unlock(&all_mddevs_lock);
4106 return mddev;
4107 }
4108 spin_unlock(&all_mddevs_lock);
4109 if (!l--)
4110 return (void*)2;/* tail */
4111 return NULL;
4112}
4113
4114static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4115{
4116 struct list_head *tmp;
4117 mddev_t *next_mddev, *mddev = v;
4118
4119 ++*pos;
4120 if (v == (void*)2)
4121 return NULL;
4122
4123 spin_lock(&all_mddevs_lock);
4124 if (v == (void*)1)
4125 tmp = all_mddevs.next;
4126 else
4127 tmp = mddev->all_mddevs.next;
4128 if (tmp != &all_mddevs)
4129 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4130 else {
4131 next_mddev = (void*)2;
4132 *pos = 0x10000;
4133 }
4134 spin_unlock(&all_mddevs_lock);
4135
4136 if (v != (void*)1)
4137 mddev_put(mddev);
4138 return next_mddev;
4139
4140}
4141
4142static void md_seq_stop(struct seq_file *seq, void *v)
4143{
4144 mddev_t *mddev = v;
4145
4146 if (mddev && v != (void*)1 && v != (void*)2)
4147 mddev_put(mddev);
4148}
4149
d7603b7e
N		 4150struct mdstat_info {
4151 int event;
4152};
4153
1da177e4
LT		 4154static int md_seq_show(struct seq_file *seq, void *v)
4155{
4156 mddev_t *mddev = v;
4157 sector_t size;
4158 struct list_head *tmp2;
4159 mdk_rdev_t *rdev;
d7603b7e 4160 struct mdstat_info *mi = seq->private;
32a7627c 4161 struct bitmap *bitmap;
1da177e4
LT		 4162
4163 if (v == (void*)1) {
2604b703 4164 struct mdk_personality *pers;
1da177e4
LT		 4165 seq_printf(seq, "Personalities : ");
4166 spin_lock(&pers_lock);
2604b703
N		 4167 list_for_each_entry(pers, &pers_list, list)
4168 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT		 4169
4170 spin_unlock(&pers_lock);
4171 seq_printf(seq, "\n");
d7603b7e 4172 mi->event = atomic_read(&md_event_count);
1da177e4
LT		 4173 return 0;
4174 }
4175 if (v == (void*)2) {
4176 status_unused(seq);
4177 return 0;
4178 }
4179
4180 if (mddev_lock(mddev)!=0)
4181 return -EINTR;
4182 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4183 seq_printf(seq, "%s : %sactive", mdname(mddev),
4184 mddev->pers ? "" : "in");
4185 if (mddev->pers) {
f91de92e 4186 if (mddev->ro==1)
1da177e4 4187 seq_printf(seq, " (read-only)");
f91de92e
N		 4188 if (mddev->ro==2)
4189 seq_printf(seq, "(auto-read-only)");
1da177e4
LT		 4190 seq_printf(seq, " %s", mddev->pers->name);
4191 }
4192
4193 size = 0;
4194 ITERATE_RDEV(mddev,rdev,tmp2) {
4195 char b[BDEVNAME_SIZE];
4196 seq_printf(seq, " %s[%d]",
4197 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 4198 if (test_bit(WriteMostly, &rdev->flags))
4199 seq_printf(seq, "(W)");
b2d444d7 4200 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4201 seq_printf(seq, "(F)");
4202 continue;
b325a32e
N		 4203 } else if (rdev->raid_disk < 0)
4204 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 4205 size += rdev->size;
4206 }
4207
4208 if (!list_empty(&mddev->disks)) {
4209 if (mddev->pers)
4210 seq_printf(seq, "\n %llu blocks",
4211 (unsigned long long)mddev->array_size);
4212 else
4213 seq_printf(seq, "\n %llu blocks",
4214 (unsigned long long)size);
4215 }
1cd6bf19
N		 4216 if (mddev->persistent) {
4217 if (mddev->major_version != 0 ||
4218 mddev->minor_version != 90) {
4219 seq_printf(seq," super %d.%d",
4220 mddev->major_version,
4221 mddev->minor_version);
4222 }
4223 } else
4224 seq_printf(seq, " super non-persistent");
1da177e4
LT		 4225
4226 if (mddev->pers) {
4227 mddev->pers->status (seq, mddev);
4228 seq_printf(seq, "\n ");
8e1b39d6
N		 4229 if (mddev->pers->sync_request) {
4230 if (mddev->curr_resync > 2) {
4231 status_resync (seq, mddev);
4232 seq_printf(seq, "\n ");
4233 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4234 seq_printf(seq, "\tresync=DELAYED\n ");
4235 else if (mddev->recovery_cp < MaxSector)
4236 seq_printf(seq, "\tresync=PENDING\n ");
4237 }
32a7627c
N		 4238 } else
4239 seq_printf(seq, "\n ");
4240
4241 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 4242 unsigned long chunk_kb;
4243 unsigned long flags;
32a7627c
N		 4244 spin_lock_irqsave(&bitmap->lock, flags);
4245 chunk_kb = bitmap->chunksize >> 10;
4246 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
4247 "%lu%s chunk",
4248 bitmap->pages - bitmap->missing_pages,
4249 bitmap->pages,
4250 (bitmap->pages - bitmap->missing_pages)
4251 << (PAGE_SHIFT - 10),
4252 chunk_kb ? chunk_kb : bitmap->chunksize,
4253 chunk_kb ? "KB" : "B");
78d742d8
N		 4254 if (bitmap->file) {
4255 seq_printf(seq, ", file: ");
4256 seq_path(seq, bitmap->file->f_vfsmnt,
4257 bitmap->file->f_dentry," \t\n");
32a7627c 4258 }
78d742d8 4259
32a7627c
N		 4260 seq_printf(seq, "\n");
4261 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 4262 }
4263
4264 seq_printf(seq, "\n");
4265 }
4266 mddev_unlock(mddev);
4267
4268 return 0;
4269}
4270
4271static struct seq_operations md_seq_ops = {
4272 .start = md_seq_start,
4273 .next = md_seq_next,
4274 .stop = md_seq_stop,
4275 .show = md_seq_show,
4276};
4277
4278static int md_seq_open(struct inode *inode, struct file *file)
4279{
4280 int error;
d7603b7e
N		 4281 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
4282 if (mi == NULL)
4283 return -ENOMEM;
1da177e4
LT		 4284
4285 error = seq_open(file, &md_seq_ops);
d7603b7e
N		 4286 if (error)
4287 kfree(mi);
4288 else {
4289 struct seq_file *p = file->private_data;
4290 p->private = mi;
4291 mi->event = atomic_read(&md_event_count);
4292 }
1da177e4
LT		 4293 return error;
4294}
4295
d7603b7e
N		 4296static int md_seq_release(struct inode *inode, struct file *file)
4297{
4298 struct seq_file *m = file->private_data;
4299 struct mdstat_info *mi = m->private;
4300 m->private = NULL;
4301 kfree(mi);
4302 return seq_release(inode, file);
4303}
4304
4305static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
4306{
4307 struct seq_file *m = filp->private_data;
4308 struct mdstat_info *mi = m->private;
4309 int mask;
4310
4311 poll_wait(filp, &md_event_waiters, wait);
4312
4313 /* always allow read */
4314 mask = POLLIN | POLLRDNORM;
4315
4316 if (mi->event != atomic_read(&md_event_count))
4317 mask |= POLLERR | POLLPRI;
4318 return mask;
4319}
4320
1da177e4
LT		 4321static struct file_operations md_seq_fops = {
4322 .open = md_seq_open,
4323 .read = seq_read,
4324 .llseek = seq_lseek,
d7603b7e
N		 4325 .release = md_seq_release,
4326 .poll = mdstat_poll,
1da177e4
LT		 4327};
4328
2604b703 4329int register_md_personality(struct mdk_personality *p)
1da177e4 4330{
1da177e4 4331 spin_lock(&pers_lock);
2604b703
N		 4332 list_add_tail(&p->list, &pers_list);
4333 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
1da177e4
LT		 4334 spin_unlock(&pers_lock);
4335 return 0;
4336}
4337
2604b703 4338int unregister_md_personality(struct mdk_personality *p)
1da177e4 4339{
2604b703 4340 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 4341 spin_lock(&pers_lock);
2604b703 4342 list_del_init(&p->list);
1da177e4
LT		 4343 spin_unlock(&pers_lock);
4344 return 0;
4345}
4346
4347static int is_mddev_idle(mddev_t *mddev)
4348{
4349 mdk_rdev_t * rdev;
4350 struct list_head *tmp;
4351 int idle;
4352 unsigned long curr_events;
4353
4354 idle = 1;
4355 ITERATE_RDEV(mddev,rdev,tmp) {
4356 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 4357 curr_events = disk_stat_read(disk, sectors[0]) +
4358 disk_stat_read(disk, sectors[1]) -
1da177e4 4359 atomic_read(&disk->sync_io);
c0e48521
N		 4360 /* The difference between curr_events and last_events
4361 * will be affected by any new non-sync IO (making
4362 * curr_events bigger) and any difference in the amount of
4363 * in-flight syncio (making current_events bigger or smaller)
4364 * The amount in-flight is currently limited to
4365 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4366 * which is at most 4096 sectors.
4367 * These numbers are fairly fragile and should be made
4368 * more robust, probably by enforcing the
4369 * 'window size' that md_do_sync sort-of uses.
4370 *
1da177e4
LT		 4371 * Note: the following is an unsigned comparison.
4372 */
c0e48521 4373 if ((curr_events - rdev->last_events + 4096) > 8192) {
1da177e4
LT		 4374 rdev->last_events = curr_events;
4375 idle = 0;
4376 }
4377 }
4378 return idle;
4379}
4380
4381void md_done_sync(mddev_t *mddev, int blocks, int ok)
4382{
4383 /* another "blocks" (512byte) blocks have been synced */
4384 atomic_sub(blocks, &mddev->recovery_active);
4385 wake_up(&mddev->recovery_wait);
4386 if (!ok) {
4387 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4388 md_wakeup_thread(mddev->thread);
4389 // stop recovery, signal do_sync ....
4390 }
4391}
4392
4393
06d91a5f
N		 4394/* md_write_start(mddev, bi)
4395 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 4396 * in superblock) before writing, schedule a superblock update
4397 * and wait for it to complete.
06d91a5f 4398 */
3d310eb7 4399void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 4400{
06d91a5f 4401 if (bio_data_dir(bi) != WRITE)
3d310eb7 4402 return;
06d91a5f 4403
f91de92e
N		 4404 BUG_ON(mddev->ro == 1);
4405 if (mddev->ro == 2) {
4406 /* need to switch to read/write */
4407 mddev->ro = 0;
4408 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4409 md_wakeup_thread(mddev->thread);
4410 }
06d91a5f 4411 atomic_inc(&mddev->writes_pending);
06d91a5f 4412 if (mddev->in_sync) {
a9701a30 4413 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 4414 if (mddev->in_sync) {
4415 mddev->in_sync = 0;
4416 mddev->sb_dirty = 1;
4417 md_wakeup_thread(mddev->thread);
4418 }
a9701a30 4419 spin_unlock_irq(&mddev->write_lock);
06d91a5f 4420 }
3d310eb7 4421 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
1da177e4
LT		 4422}
4423
4424void md_write_end(mddev_t *mddev)
4425{
4426 if (atomic_dec_and_test(&mddev->writes_pending)) {
4427 if (mddev->safemode == 2)
4428 md_wakeup_thread(mddev->thread);
4429 else
4430 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
4431 }
4432}
4433
75c96f85 4434static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
1da177e4
LT		 4435
4436#define SYNC_MARKS 10
4437#define SYNC_MARK_STEP (3*HZ)
4438static void md_do_sync(mddev_t *mddev)
4439{
4440 mddev_t *mddev2;
4441 unsigned int currspeed = 0,
4442 window;
57afd89f 4443 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 4444 unsigned long mark[SYNC_MARKS];
4445 sector_t mark_cnt[SYNC_MARKS];
4446 int last_mark,m;
4447 struct list_head *tmp;
4448 sector_t last_check;
57afd89f 4449 int skipped = 0;
1da177e4
LT		 4450
4451 /* just incase thread restarts... */
4452 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
4453 return;
4454
4455 /* we overload curr_resync somewhat here.
4456 * 0 == not engaged in resync at all
4457 * 2 == checking that there is no conflict with another sync
4458 * 1 == like 2, but have yielded to allow conflicting resync to
4459 * commense
4460 * other == active in resync - this many blocks
4461 *
4462 * Before starting a resync we must have set curr_resync to
4463 * 2, and then checked that every "conflicting" array has curr_resync
4464 * less than ours. When we find one that is the same or higher
4465 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
4466 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
4467 * This will mean we have to start checking from the beginning again.
4468 *
4469 */
4470
4471 do {
4472 mddev->curr_resync = 2;
4473
4474 try_again:
787453c2 4475 if (kthread_should_stop()) {
6985c43f 4476 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 4477 goto skip;
4478 }
4479 ITERATE_MDDEV(mddev2,tmp) {
1da177e4
LT		 4480 if (mddev2 == mddev)
4481 continue;
4482 if (mddev2->curr_resync &&
4483 match_mddev_units(mddev,mddev2)) {
4484 DEFINE_WAIT(wq);
4485 if (mddev < mddev2 && mddev->curr_resync == 2) {
4486 /* arbitrarily yield */
4487 mddev->curr_resync = 1;
4488 wake_up(&resync_wait);
4489 }
4490 if (mddev > mddev2 && mddev->curr_resync == 1)
4491 /* no need to wait here, we can wait the next
4492 * time 'round when curr_resync == 2
4493 */
4494 continue;
787453c2
N		 4495 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
4496 if (!kthread_should_stop() &&
8712e553 4497 mddev2->curr_resync >= mddev->curr_resync) {
1da177e4
LT		 4498 printk(KERN_INFO "md: delaying resync of %s"
4499 " until %s has finished resync (they"
4500 " share one or more physical units)\n",
4501 mdname(mddev), mdname(mddev2));
4502 mddev_put(mddev2);
4503 schedule();
4504 finish_wait(&resync_wait, &wq);
4505 goto try_again;
4506 }
4507 finish_wait(&resync_wait, &wq);
4508 }
4509 }
4510 } while (mddev->curr_resync < 2);
4511
9d88883e 4512 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 4513 /* resync follows the size requested by the personality,
57afd89f 4514 * which defaults to physical size, but can be virtual size
1da177e4
LT		 4515 */
4516 max_sectors = mddev->resync_max_sectors;
9d88883e
N		 4517 mddev->resync_mismatches = 0;
4518 } else
1da177e4
LT		 4519 /* recovery follows the physical size of devices */
4520 max_sectors = mddev->size << 1;
4521
4522 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
4523 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
88202a0c 4524 " %d KB/sec/disc.\n", speed_min(mddev));
338cec32 4525 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
1da177e4 4526 "(but not more than %d KB/sec) for reconstruction.\n",
88202a0c 4527 speed_max(mddev));
1da177e4
LT		 4528
4529 is_mddev_idle(mddev); /* this also initializes IO event counters */
32a7627c 4530 /* we don't use the checkpoint if there's a bitmap */
24dd469d
N		 4531 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap
4532 && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
1da177e4
LT		 4533 j = mddev->recovery_cp;
4534 else
4535 j = 0;
57afd89f 4536 io_sectors = 0;
1da177e4
LT		 4537 for (m = 0; m < SYNC_MARKS; m++) {
4538 mark[m] = jiffies;
57afd89f 4539 mark_cnt[m] = io_sectors;
1da177e4
LT		 4540 }
4541 last_mark = 0;
4542 mddev->resync_mark = mark[last_mark];
4543 mddev->resync_mark_cnt = mark_cnt[last_mark];
4544
4545 /*
4546 * Tune reconstruction:
4547 */
4548 window = 32*(PAGE_SIZE/512);
4549 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
4550 window/2,(unsigned long long) max_sectors/2);
4551
4552 atomic_set(&mddev->recovery_active, 0);
4553 init_waitqueue_head(&mddev->recovery_wait);
4554 last_check = 0;
4555
4556 if (j>2) {
4557 printk(KERN_INFO
4558 "md: resuming recovery of %s from checkpoint.\n",
4559 mdname(mddev));
4560 mddev->curr_resync = j;
4561 }
4562
4563 while (j < max_sectors) {
57afd89f 4564 sector_t sectors;
1da177e4 4565
57afd89f
N		 4566 skipped = 0;
4567 sectors = mddev->pers->sync_request(mddev, j, &skipped,
88202a0c 4568 currspeed < speed_min(mddev));
57afd89f 4569 if (sectors == 0) {
1da177e4
LT		 4570 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4571 goto out;
4572 }
57afd89f
N		 4573
4574 if (!skipped) { /* actual IO requested */
4575 io_sectors += sectors;
4576 atomic_add(sectors, &mddev->recovery_active);
4577 }
4578
1da177e4
LT		 4579 j += sectors;
4580 if (j>1) mddev->curr_resync = j;
d7603b7e
N		 4581 if (last_check == 0)
4582 /* this is the earliers that rebuilt will be
4583 * visible in /proc/mdstat
4584 */
4585 md_new_event(mddev);
57afd89f
N		 4586
4587 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 4588 continue;
4589
57afd89f 4590 last_check = io_sectors;
1da177e4
LT		 4591
4592 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
4593 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
4594 break;
4595
4596 repeat:
4597 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
4598 /* step marks */
4599 int next = (last_mark+1) % SYNC_MARKS;
4600
4601 mddev->resync_mark = mark[next];
4602 mddev->resync_mark_cnt = mark_cnt[next];
4603 mark[next] = jiffies;
57afd89f 4604 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 4605 last_mark = next;
4606 }
4607
4608
787453c2 4609 if (kthread_should_stop()) {
1da177e4
LT		 4610 /*
4611 * got a signal, exit.
4612 */
4613 printk(KERN_INFO
4614 "md: md_do_sync() got signal ... exiting\n");
1da177e4
LT		 4615 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4616 goto out;
4617 }
4618
4619 /*
4620 * this loop exits only if either when we are slower than
4621 * the 'hard' speed limit, or the system was IO-idle for
4622 * a jiffy.
4623 * the system might be non-idle CPU-wise, but we only care
4624 * about not overloading the IO subsystem. (things like an
4625 * e2fsck being done on the RAID array should execute fast)
4626 */
4627 mddev->queue->unplug_fn(mddev->queue);
4628 cond_resched();
4629
57afd89f
N		 4630 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
4631 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4 4632
88202a0c
N		 4633 if (currspeed > speed_min(mddev)) {
4634 if ((currspeed > speed_max(mddev)) ||
1da177e4 4635 !is_mddev_idle(mddev)) {
c0e48521 4636 msleep(500);
1da177e4
LT		 4637 goto repeat;
4638 }
4639 }
4640 }
4641 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
4642 /*
4643 * this also signals 'finished resyncing' to md_stop
4644 */
4645 out:
4646 mddev->queue->unplug_fn(mddev->queue);
4647
4648 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
4649
4650 /* tell personality that we are finished */
57afd89f 4651 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 4652
4653 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4654 mddev->curr_resync > 2 &&
4655 mddev->curr_resync >= mddev->recovery_cp) {
4656 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4657 printk(KERN_INFO
4658 "md: checkpointing recovery of %s.\n",
4659 mdname(mddev));
4660 mddev->recovery_cp = mddev->curr_resync;
4661 } else
4662 mddev->recovery_cp = MaxSector;
4663 }
4664
1da177e4
LT		 4665 skip:
4666 mddev->curr_resync = 0;
4667 wake_up(&resync_wait);
4668 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
4669 md_wakeup_thread(mddev->thread);
4670}
4671
4672
4673/*
4674 * This routine is regularly called by all per-raid-array threads to
4675 * deal with generic issues like resync and super-block update.
4676 * Raid personalities that don't have a thread (linear/raid0) do not
4677 * need this as they never do any recovery or update the superblock.
4678 *
4679 * It does not do any resync itself, but rather "forks" off other threads
4680 * to do that as needed.
4681 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4682 * "->recovery" and create a thread at ->sync_thread.
4683 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4684 * and wakeups up this thread which will reap the thread and finish up.
4685 * This thread also removes any faulty devices (with nr_pending == 0).
4686 *
4687 * The overall approach is:
4688 * 1/ if the superblock needs updating, update it.
4689 * 2/ If a recovery thread is running, don't do anything else.
4690 * 3/ If recovery has finished, clean up, possibly marking spares active.
4691 * 4/ If there are any faulty devices, remove them.
4692 * 5/ If array is degraded, try to add spares devices
4693 * 6/ If array has spares or is not in-sync, start a resync thread.
4694 */
4695void md_check_recovery(mddev_t *mddev)
4696{
4697 mdk_rdev_t *rdev;
4698 struct list_head *rtmp;
4699
4700
5f40402d
N		 4701 if (mddev->bitmap)
4702 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 4703
4704 if (mddev->ro)
4705 return;
fca4d848
N		 4706
4707 if (signal_pending(current)) {
4708 if (mddev->pers->sync_request) {
4709 printk(KERN_INFO "md: %s in immediate safe mode\n",
4710 mdname(mddev));
4711 mddev->safemode = 2;
4712 }
4713 flush_signals(current);
4714 }
4715
1da177e4
LT		 4716 if ( ! (
4717 mddev->sb_dirty ||
4718 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848
N		 4719 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
4720 (mddev->safemode == 1) ||
4721 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
4722 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 4723 ))
4724 return;
fca4d848 4725
1da177e4
LT		 4726 if (mddev_trylock(mddev)==0) {
4727 int spares =0;
fca4d848 4728
a9701a30 4729 spin_lock_irq(&mddev->write_lock);
fca4d848
N		 4730 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
4731 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
4732 mddev->in_sync = 1;
4733 mddev->sb_dirty = 1;
4734 }
4735 if (mddev->safemode == 1)
4736 mddev->safemode = 0;
a9701a30 4737 spin_unlock_irq(&mddev->write_lock);
fca4d848 4738
1da177e4
LT		 4739 if (mddev->sb_dirty)
4740 md_update_sb(mddev);
06d91a5f 4741
06d91a5f 4742
1da177e4
LT		 4743 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4744 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
4745 /* resync/recovery still happening */
4746 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4747 goto unlock;
4748 }
4749 if (mddev->sync_thread) {
4750 /* resync has finished, collect result */
4751 md_unregister_thread(mddev->sync_thread);
4752 mddev->sync_thread = NULL;
4753 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4754 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4755 /* success...*/
4756 /* activate any spares */
4757 mddev->pers->spare_active(mddev);
4758 }
4759 md_update_sb(mddev);
41158c7e
N		 4760
4761 /* if array is no-longer degraded, then any saved_raid_disk
4762 * information must be scrapped
4763 */
4764 if (!mddev->degraded)
4765 ITERATE_RDEV(mddev,rdev,rtmp)
4766 rdev->saved_raid_disk = -1;
4767
1da177e4
LT		 4768 mddev->recovery = 0;
4769 /* flag recovery needed just to double check */
4770 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
d7603b7e 4771 md_new_event(mddev);
1da177e4
LT		 4772 goto unlock;
4773 }
24dd469d
N		 4774 /* Clear some bits that don't mean anything, but
4775 * might be left set
4776 */
4777 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4778 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
4779 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
4780 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4
LT		 4781
4782 /* no recovery is running.
4783 * remove any failed drives, then
4784 * add spares if possible.
4785 * Spare are also removed and re-added, to allow
4786 * the personality to fail the re-add.
4787 */
4788 ITERATE_RDEV(mddev,rdev,rtmp)
4789 if (rdev->raid_disk >= 0 &&
b2d444d7 4790 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
1da177e4 4791 atomic_read(&rdev->nr_pending)==0) {
86e6ffdd
N		 4792 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
4793 char nm[20];
4794 sprintf(nm,"rd%d", rdev->raid_disk);
4795 sysfs_remove_link(&mddev->kobj, nm);
1da177e4 4796 rdev->raid_disk = -1;
86e6ffdd 4797 }
1da177e4
LT		 4798 }
4799
4800 if (mddev->degraded) {
4801 ITERATE_RDEV(mddev,rdev,rtmp)
4802 if (rdev->raid_disk < 0
b2d444d7 4803 && !test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 4804 if (mddev->pers->hot_add_disk(mddev,rdev)) {
4805 char nm[20];
4806 sprintf(nm, "rd%d", rdev->raid_disk);
4807 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
1da177e4 4808 spares++;
d7603b7e 4809 md_new_event(mddev);
86e6ffdd 4810 } else
1da177e4
LT		 4811 break;
4812 }
4813 }
4814
24dd469d
N		 4815 if (spares) {
4816 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4817 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4818 } else if (mddev->recovery_cp < MaxSector) {
4819 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4820 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4821 /* nothing to be done ... */
1da177e4 4822 goto unlock;
24dd469d 4823
1da177e4
LT		 4824 if (mddev->pers->sync_request) {
4825 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 4826 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
4827 /* We are adding a device or devices to an array
4828 * which has the bitmap stored on all devices.
4829 * So make sure all bitmap pages get written
4830 */
4831 bitmap_write_all(mddev->bitmap);
4832 }
1da177e4
LT		 4833 mddev->sync_thread = md_register_thread(md_do_sync,
4834 mddev,
4835 "%s_resync");
4836 if (!mddev->sync_thread) {
4837 printk(KERN_ERR "%s: could not start resync"
4838 " thread...\n",
4839 mdname(mddev));
4840 /* leave the spares where they are, it shouldn't hurt */
4841 mddev->recovery = 0;
d7603b7e 4842 } else
1da177e4 4843 md_wakeup_thread(mddev->sync_thread);
d7603b7e 4844 md_new_event(mddev);
1da177e4
LT		 4845 }
4846 unlock:
4847 mddev_unlock(mddev);
4848 }
4849}
4850
75c96f85
AB		 4851static int md_notify_reboot(struct notifier_block *this,
4852 unsigned long code, void *x)
1da177e4
LT		 4853{
4854 struct list_head *tmp;
4855 mddev_t *mddev;
4856
4857 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
4858
4859 printk(KERN_INFO "md: stopping all md devices.\n");
4860
4861 ITERATE_MDDEV(mddev,tmp)
4862 if (mddev_trylock(mddev)==0)
4863 do_md_stop (mddev, 1);
4864 /*
4865 * certain more exotic SCSI devices are known to be
4866 * volatile wrt too early system reboots. While the
4867 * right place to handle this issue is the given
4868 * driver, we do want to have a safe RAID driver ...
4869 */
4870 mdelay(1000*1);
4871 }
4872 return NOTIFY_DONE;
4873}
4874
75c96f85 4875static struct notifier_block md_notifier = {
1da177e4
LT		 4876 .notifier_call = md_notify_reboot,
4877 .next = NULL,
4878 .priority = INT_MAX, /* before any real devices */
4879};
4880
4881static void md_geninit(void)
4882{
4883 struct proc_dir_entry *p;
4884
4885 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
4886
4887 p = create_proc_entry("mdstat", S_IRUGO, NULL);
4888 if (p)
4889 p->proc_fops = &md_seq_fops;
4890}
4891
75c96f85 4892static int __init md_init(void)
1da177e4
LT		 4893{
4894 int minor;
4895
4896 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4897 " MD_SB_DISKS=%d\n",
4898 MD_MAJOR_VERSION, MD_MINOR_VERSION,
4899 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
bd926c63 4900 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
32a7627c 4901 BITMAP_MINOR);
1da177e4
LT		 4902
4903 if (register_blkdev(MAJOR_NR, "md"))
4904 return -1;
4905 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
4906 unregister_blkdev(MAJOR_NR, "md");
4907 return -1;
4908 }
4909 devfs_mk_dir("md");
4910 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
4911 md_probe, NULL, NULL);
4912 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
4913 md_probe, NULL, NULL);
4914
4915 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4916 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
4917 S_IFBLK|S_IRUSR|S_IWUSR,
4918 "md/%d", minor);
4919
4920 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4921 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
4922 S_IFBLK|S_IRUSR|S_IWUSR,
4923 "md/mdp%d", minor);
4924
4925
4926 register_reboot_notifier(&md_notifier);
4927 raid_table_header = register_sysctl_table(raid_root_table, 1);
4928
4929 md_geninit();
4930 return (0);
4931}
4932
4933
4934#ifndef MODULE
4935
4936/*
4937 * Searches all registered partitions for autorun RAID arrays
4938 * at boot time.
4939 */
4940static dev_t detected_devices[128];
4941static int dev_cnt;
4942
4943void md_autodetect_dev(dev_t dev)
4944{
4945 if (dev_cnt >= 0 && dev_cnt < 127)
4946 detected_devices[dev_cnt++] = dev;
4947}
4948
4949
4950static void autostart_arrays(int part)
4951{
4952 mdk_rdev_t *rdev;
4953 int i;
4954
4955 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
4956
4957 for (i = 0; i < dev_cnt; i++) {
4958 dev_t dev = detected_devices[i];
4959
4960 rdev = md_import_device(dev,0, 0);
4961 if (IS_ERR(rdev))
4962 continue;
4963
b2d444d7 4964 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4965 MD_BUG();
4966 continue;
4967 }
4968 list_add(&rdev->same_set, &pending_raid_disks);
4969 }
4970 dev_cnt = 0;
4971
4972 autorun_devices(part);
4973}
4974
4975#endif
4976
4977static __exit void md_exit(void)
4978{
4979 mddev_t *mddev;
4980 struct list_head *tmp;
4981 int i;
4982 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
4983 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
4984 for (i=0; i < MAX_MD_DEVS; i++)
4985 devfs_remove("md/%d", i);
4986 for (i=0; i < MAX_MD_DEVS; i++)
4987 devfs_remove("md/d%d", i);
4988
4989 devfs_remove("md");
4990
4991 unregister_blkdev(MAJOR_NR,"md");
4992 unregister_blkdev(mdp_major, "mdp");
4993 unregister_reboot_notifier(&md_notifier);
4994 unregister_sysctl_table(raid_table_header);
4995 remove_proc_entry("mdstat", NULL);
4996 ITERATE_MDDEV(mddev,tmp) {
4997 struct gendisk *disk = mddev->gendisk;
4998 if (!disk)
4999 continue;
5000 export_array(mddev);
5001 del_gendisk(disk);
5002 put_disk(disk);
5003 mddev->gendisk = NULL;
5004 mddev_put(mddev);
5005 }
5006}
5007
5008module_init(md_init)
5009module_exit(md_exit)
5010
f91de92e
N		 5011static int get_ro(char *buffer, struct kernel_param *kp)
5012{
5013 return sprintf(buffer, "%d", start_readonly);
5014}
5015static int set_ro(const char *val, struct kernel_param *kp)
5016{
5017 char *e;
5018 int num = simple_strtoul(val, &e, 10);
5019 if (*val && (*e == '\0' || *e == '\n')) {
5020 start_readonly = num;
4dbcdc75 5021 return 0;
f91de92e
N		 5022 }
5023 return -EINVAL;
5024}
5025
5026module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
6ff8d8ec
N		 5027module_param(start_dirty_degraded, int, 0644);
5028
f91de92e 5029
1da177e4
LT		 5030EXPORT_SYMBOL(register_md_personality);
5031EXPORT_SYMBOL(unregister_md_personality);
5032EXPORT_SYMBOL(md_error);
5033EXPORT_SYMBOL(md_done_sync);
5034EXPORT_SYMBOL(md_write_start);
5035EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 5036EXPORT_SYMBOL(md_register_thread);
5037EXPORT_SYMBOL(md_unregister_thread);
5038EXPORT_SYMBOL(md_wakeup_thread);
5039EXPORT_SYMBOL(md_print_devices);
5040EXPORT_SYMBOL(md_check_recovery);
5041MODULE_LICENSE("GPL");
aa1595e9 5042MODULE_ALIAS("md");
72008652 5043MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
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