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[mirror_ubuntu-artful-kernel.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
a654b9d8
N		 1164 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1165 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
71c0805c 1166 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8
N		 1167 }
1168
1da177e4
LT		 1169 max_dev = 0;
1170 ITERATE_RDEV(mddev,rdev2,tmp)
1171 if (rdev2->desc_nr+1 > max_dev)
1172 max_dev = rdev2->desc_nr+1;
1173
1174 sb->max_dev = cpu_to_le32(max_dev);
1175 for (i=0; i<max_dev;i++)
1176 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1177
1178 ITERATE_RDEV(mddev,rdev2,tmp) {
1179 i = rdev2->desc_nr;
b2d444d7 1180 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1181 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1182 else if (test_bit(In_sync, &rdev2->flags))
1da177e4
LT		 1183 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1184 else
1185 sb->dev_roles[i] = cpu_to_le16(0xffff);
1186 }
1187
1188 sb->recovery_offset = cpu_to_le64(0); /* not supported yet */
1189 sb->sb_csum = calc_sb_1_csum(sb);
1190}
1191
1192
75c96f85 1193static struct super_type super_types[] = {
1da177e4
LT		 1194 [0] = {
1195 .name = "0.90.0",
1196 .owner = THIS_MODULE,
1197 .load_super = super_90_load,
1198 .validate_super = super_90_validate,
1199 .sync_super = super_90_sync,
1200 },
1201 [1] = {
1202 .name = "md-1",
1203 .owner = THIS_MODULE,
1204 .load_super = super_1_load,
1205 .validate_super = super_1_validate,
1206 .sync_super = super_1_sync,
1207 },
1208};
1209
1210static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1211{
1212 struct list_head *tmp;
1213 mdk_rdev_t *rdev;
1214
1215 ITERATE_RDEV(mddev,rdev,tmp)
1216 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1217 return rdev;
1218
1219 return NULL;
1220}
1221
1222static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1223{
1224 struct list_head *tmp;
1225 mdk_rdev_t *rdev;
1226
1227 ITERATE_RDEV(mddev1,rdev,tmp)
1228 if (match_dev_unit(mddev2, rdev))
1229 return 1;
1230
1231 return 0;
1232}
1233
1234static LIST_HEAD(pending_raid_disks);
1235
1236static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1237{
1238 mdk_rdev_t *same_pdev;
1239 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
f637b9f9 1240 struct kobject *ko;
1da177e4
LT		 1241
1242 if (rdev->mddev) {
1243 MD_BUG();
1244 return -EINVAL;
1245 }
2bf071bf
N		 1246 /* make sure rdev->size exceeds mddev->size */
1247 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1248 if (mddev->pers)
1249 /* Cannot change size, so fail */
1250 return -ENOSPC;
1251 else
1252 mddev->size = rdev->size;
1253 }
1da177e4
LT		 1254 same_pdev = match_dev_unit(mddev, rdev);
1255 if (same_pdev)
1256 printk(KERN_WARNING
1257 "%s: WARNING: %s appears to be on the same physical"
1258 " disk as %s. True\n protection against single-disk"
1259 " failure might be compromised.\n",
1260 mdname(mddev), bdevname(rdev->bdev,b),
1261 bdevname(same_pdev->bdev,b2));
1262
1263 /* Verify rdev->desc_nr is unique.
1264 * If it is -1, assign a free number, else
1265 * check number is not in use
1266 */
1267 if (rdev->desc_nr < 0) {
1268 int choice = 0;
1269 if (mddev->pers) choice = mddev->raid_disks;
1270 while (find_rdev_nr(mddev, choice))
1271 choice++;
1272 rdev->desc_nr = choice;
1273 } else {
1274 if (find_rdev_nr(mddev, rdev->desc_nr))
1275 return -EBUSY;
1276 }
19133a42
N		 1277 bdevname(rdev->bdev,b);
1278 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1279 return -ENOMEM;
1da177e4
LT		 1280
1281 list_add(&rdev->same_set, &mddev->disks);
1282 rdev->mddev = mddev;
19133a42 1283 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 1284
9c791977 1285 rdev->kobj.parent = &mddev->kobj;
86e6ffdd
N		 1286 kobject_add(&rdev->kobj);
1287
f637b9f9
N		 1288 if (rdev->bdev->bd_part)
1289 ko = &rdev->bdev->bd_part->kobj;
1290 else
1291 ko = &rdev->bdev->bd_disk->kobj;
1292 sysfs_create_link(&rdev->kobj, ko, "block");
1da177e4
LT		 1293 return 0;
1294}
1295
1296static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1297{
1298 char b[BDEVNAME_SIZE];
1299 if (!rdev->mddev) {
1300 MD_BUG();
1301 return;
1302 }
1303 list_del_init(&rdev->same_set);
1304 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1305 rdev->mddev = NULL;
86e6ffdd
N		 1306 sysfs_remove_link(&rdev->kobj, "block");
1307 kobject_del(&rdev->kobj);
1da177e4
LT		 1308}
1309
1310/*
1311 * prevent the device from being mounted, repartitioned or
1312 * otherwise reused by a RAID array (or any other kernel
1313 * subsystem), by bd_claiming the device.
1314 */
1315static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1316{
1317 int err = 0;
1318 struct block_device *bdev;
1319 char b[BDEVNAME_SIZE];
1320
1321 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1322 if (IS_ERR(bdev)) {
1323 printk(KERN_ERR "md: could not open %s.\n",
1324 __bdevname(dev, b));
1325 return PTR_ERR(bdev);
1326 }
1327 err = bd_claim(bdev, rdev);
1328 if (err) {
1329 printk(KERN_ERR "md: could not bd_claim %s.\n",
1330 bdevname(bdev, b));
1331 blkdev_put(bdev);
1332 return err;
1333 }
1334 rdev->bdev = bdev;
1335 return err;
1336}
1337
1338static void unlock_rdev(mdk_rdev_t *rdev)
1339{
1340 struct block_device *bdev = rdev->bdev;
1341 rdev->bdev = NULL;
1342 if (!bdev)
1343 MD_BUG();
1344 bd_release(bdev);
1345 blkdev_put(bdev);
1346}
1347
1348void md_autodetect_dev(dev_t dev);
1349
1350static void export_rdev(mdk_rdev_t * rdev)
1351{
1352 char b[BDEVNAME_SIZE];
1353 printk(KERN_INFO "md: export_rdev(%s)\n",
1354 bdevname(rdev->bdev,b));
1355 if (rdev->mddev)
1356 MD_BUG();
1357 free_disk_sb(rdev);
1358 list_del_init(&rdev->same_set);
1359#ifndef MODULE
1360 md_autodetect_dev(rdev->bdev->bd_dev);
1361#endif
1362 unlock_rdev(rdev);
86e6ffdd 1363 kobject_put(&rdev->kobj);
1da177e4
LT		 1364}
1365
1366static void kick_rdev_from_array(mdk_rdev_t * rdev)
1367{
1368 unbind_rdev_from_array(rdev);
1369 export_rdev(rdev);
1370}
1371
1372static void export_array(mddev_t *mddev)
1373{
1374 struct list_head *tmp;
1375 mdk_rdev_t *rdev;
1376
1377 ITERATE_RDEV(mddev,rdev,tmp) {
1378 if (!rdev->mddev) {
1379 MD_BUG();
1380 continue;
1381 }
1382 kick_rdev_from_array(rdev);
1383 }
1384 if (!list_empty(&mddev->disks))
1385 MD_BUG();
1386 mddev->raid_disks = 0;
1387 mddev->major_version = 0;
1388}
1389
1390static void print_desc(mdp_disk_t *desc)
1391{
1392 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1393 desc->major,desc->minor,desc->raid_disk,desc->state);
1394}
1395
1396static void print_sb(mdp_super_t *sb)
1397{
1398 int i;
1399
1400 printk(KERN_INFO
1401 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1402 sb->major_version, sb->minor_version, sb->patch_version,
1403 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1404 sb->ctime);
1405 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1406 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1407 sb->md_minor, sb->layout, sb->chunk_size);
1408 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1409 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1410 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1411 sb->failed_disks, sb->spare_disks,
1412 sb->sb_csum, (unsigned long)sb->events_lo);
1413
1414 printk(KERN_INFO);
1415 for (i = 0; i < MD_SB_DISKS; i++) {
1416 mdp_disk_t *desc;
1417
1418 desc = sb->disks + i;
1419 if (desc->number || desc->major || desc->minor ||
1420 desc->raid_disk || (desc->state && (desc->state != 4))) {
1421 printk(" D %2d: ", i);
1422 print_desc(desc);
1423 }
1424 }
1425 printk(KERN_INFO "md: THIS: ");
1426 print_desc(&sb->this_disk);
1427
1428}
1429
1430static void print_rdev(mdk_rdev_t *rdev)
1431{
1432 char b[BDEVNAME_SIZE];
1433 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1434 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
b2d444d7
N		 1435 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1436 rdev->desc_nr);
1da177e4
LT		 1437 if (rdev->sb_loaded) {
1438 printk(KERN_INFO "md: rdev superblock:\n");
1439 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1440 } else
1441 printk(KERN_INFO "md: no rdev superblock!\n");
1442}
1443
1444void md_print_devices(void)
1445{
1446 struct list_head *tmp, *tmp2;
1447 mdk_rdev_t *rdev;
1448 mddev_t *mddev;
1449 char b[BDEVNAME_SIZE];
1450
1451 printk("\n");
1452 printk("md: **********************************\n");
1453 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1454 printk("md: **********************************\n");
1455 ITERATE_MDDEV(mddev,tmp) {
1da177e4 1456
32a7627c
N		 1457 if (mddev->bitmap)
1458 bitmap_print_sb(mddev->bitmap);
1459 else
1460 printk("%s: ", mdname(mddev));
1da177e4
LT		 1461 ITERATE_RDEV(mddev,rdev,tmp2)
1462 printk("<%s>", bdevname(rdev->bdev,b));
1463 printk("\n");
1464
1465 ITERATE_RDEV(mddev,rdev,tmp2)
1466 print_rdev(rdev);
1467 }
1468 printk("md: **********************************\n");
1469 printk("\n");
1470}
1471
1472
1da177e4
LT		 1473static void sync_sbs(mddev_t * mddev)
1474{
1475 mdk_rdev_t *rdev;
1476 struct list_head *tmp;
1477
1478 ITERATE_RDEV(mddev,rdev,tmp) {
1479 super_types[mddev->major_version].
1480 sync_super(mddev, rdev);
1481 rdev->sb_loaded = 1;
1482 }
1483}
1484
1485static void md_update_sb(mddev_t * mddev)
1486{
7bfa19f2 1487 int err;
1da177e4
LT		 1488 struct list_head *tmp;
1489 mdk_rdev_t *rdev;
06d91a5f 1490 int sync_req;
1da177e4 1491
1da177e4 1492repeat:
a9701a30 1493 spin_lock_irq(&mddev->write_lock);
06d91a5f 1494 sync_req = mddev->in_sync;
1da177e4
LT		 1495 mddev->utime = get_seconds();
1496 mddev->events ++;
1497
1498 if (!mddev->events) {
1499 /*
1500 * oops, this 64-bit counter should never wrap.
1501 * Either we are in around ~1 trillion A.C., assuming
1502 * 1 reboot per second, or we have a bug:
1503 */
1504 MD_BUG();
1505 mddev->events --;
1506 }
7bfa19f2 1507 mddev->sb_dirty = 2;
1da177e4
LT		 1508 sync_sbs(mddev);
1509
1510 /*
1511 * do not write anything to disk if using
1512 * nonpersistent superblocks
1513 */
06d91a5f
N		 1514 if (!mddev->persistent) {
1515 mddev->sb_dirty = 0;
a9701a30 1516 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1517 wake_up(&mddev->sb_wait);
1da177e4 1518 return;
06d91a5f 1519 }
a9701a30 1520 spin_unlock_irq(&mddev->write_lock);
1da177e4
LT		 1521
1522 dprintk(KERN_INFO
1523 "md: updating %s RAID superblock on device (in sync %d)\n",
1524 mdname(mddev),mddev->in_sync);
1525
32a7627c 1526 err = bitmap_update_sb(mddev->bitmap);
1da177e4
LT		 1527 ITERATE_RDEV(mddev,rdev,tmp) {
1528 char b[BDEVNAME_SIZE];
1529 dprintk(KERN_INFO "md: ");
b2d444d7 1530 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1531 dprintk("(skipping faulty ");
1532
1533 dprintk("%s ", bdevname(rdev->bdev,b));
b2d444d7 1534 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 1535 md_super_write(mddev,rdev,
0002b271 1536 rdev->sb_offset<<1, rdev->sb_size,
7bfa19f2
N		 1537 rdev->sb_page);
1538 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1539 bdevname(rdev->bdev,b),
1540 (unsigned long long)rdev->sb_offset);
1541
1da177e4
LT		 1542 } else
1543 dprintk(")\n");
7bfa19f2 1544 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT		 1545 /* only need to write one superblock... */
1546 break;
1547 }
a9701a30 1548 md_super_wait(mddev);
7bfa19f2
N		 1549 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1550
a9701a30 1551 spin_lock_irq(&mddev->write_lock);
7bfa19f2 1552 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
06d91a5f 1553 /* have to write it out again */
a9701a30 1554 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N		 1555 goto repeat;
1556 }
1557 mddev->sb_dirty = 0;
a9701a30 1558 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1559 wake_up(&mddev->sb_wait);
06d91a5f 1560
1da177e4
LT		 1561}
1562
bce74dac
N		 1563/* words written to sysfs files may, or my not, be \n terminated.
1564 * We want to accept with case. For this we use cmd_match.
1565 */
1566static int cmd_match(const char *cmd, const char *str)
1567{
1568 /* See if cmd, written into a sysfs file, matches
1569 * str. They must either be the same, or cmd can
1570 * have a trailing newline
1571 */
1572 while (*cmd && *str && *cmd == *str) {
1573 cmd++;
1574 str++;
1575 }
1576 if (*cmd == '\n')
1577 cmd++;
1578 if (*str || *cmd)
1579 return 0;
1580 return 1;
1581}
1582
86e6ffdd
N		 1583struct rdev_sysfs_entry {
1584 struct attribute attr;
1585 ssize_t (*show)(mdk_rdev_t *, char *);
1586 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1587};
1588
1589static ssize_t
96de1e66 1590state_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1591{
1592 char *sep = "";
1593 int len=0;
1594
b2d444d7 1595 if (test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 1596 len+= sprintf(page+len, "%sfaulty",sep);
1597 sep = ",";
1598 }
b2d444d7 1599 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1600 len += sprintf(page+len, "%sin_sync",sep);
1601 sep = ",";
1602 }
b2d444d7
N		 1603 if (!test_bit(Faulty, &rdev->flags) &&
1604 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1605 len += sprintf(page+len, "%sspare", sep);
1606 sep = ",";
1607 }
1608 return len+sprintf(page+len, "\n");
1609}
1610
96de1e66
N		 1611static struct rdev_sysfs_entry
1612rdev_state = __ATTR_RO(state);
86e6ffdd
N		 1613
1614static ssize_t
96de1e66 1615super_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1616{
1617 if (rdev->sb_loaded && rdev->sb_size) {
1618 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1619 return rdev->sb_size;
1620 } else
1621 return 0;
1622}
96de1e66
N		 1623static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1624
4dbcdc75
N		 1625static ssize_t
1626errors_show(mdk_rdev_t *rdev, char *page)
1627{
1628 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1629}
1630
1631static ssize_t
1632errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1633{
1634 char *e;
1635 unsigned long n = simple_strtoul(buf, &e, 10);
1636 if (*buf && (*e == 0 || *e == '\n')) {
1637 atomic_set(&rdev->corrected_errors, n);
1638 return len;
1639 }
1640 return -EINVAL;
1641}
1642static struct rdev_sysfs_entry rdev_errors =
1643__ATTR(errors, 0644, errors_show, errors_store);
1644
014236d2
N		 1645static ssize_t
1646slot_show(mdk_rdev_t *rdev, char *page)
1647{
1648 if (rdev->raid_disk < 0)
1649 return sprintf(page, "none\n");
1650 else
1651 return sprintf(page, "%d\n", rdev->raid_disk);
1652}
1653
1654static ssize_t
1655slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1656{
1657 char *e;
1658 int slot = simple_strtoul(buf, &e, 10);
1659 if (strncmp(buf, "none", 4)==0)
1660 slot = -1;
1661 else if (e==buf || (*e && *e!= '\n'))
1662 return -EINVAL;
1663 if (rdev->mddev->pers)
1664 /* Cannot set slot in active array (yet) */
1665 return -EBUSY;
1666 if (slot >= rdev->mddev->raid_disks)
1667 return -ENOSPC;
1668 rdev->raid_disk = slot;
1669 /* assume it is working */
1670 rdev->flags = 0;
1671 set_bit(In_sync, &rdev->flags);
1672 return len;
1673}
1674
1675
1676static struct rdev_sysfs_entry rdev_slot =
1677__ATTR(slot, 0644, slot_show, slot_store);
1678
93c8cad0
N		 1679static ssize_t
1680offset_show(mdk_rdev_t *rdev, char *page)
1681{
6961ece4 1682 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
93c8cad0
N		 1683}
1684
1685static ssize_t
1686offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1687{
1688 char *e;
1689 unsigned long long offset = simple_strtoull(buf, &e, 10);
1690 if (e==buf || (*e && *e != '\n'))
1691 return -EINVAL;
1692 if (rdev->mddev->pers)
1693 return -EBUSY;
1694 rdev->data_offset = offset;
1695 return len;
1696}
1697
1698static struct rdev_sysfs_entry rdev_offset =
1699__ATTR(offset, 0644, offset_show, offset_store);
1700
83303b61
N		 1701static ssize_t
1702rdev_size_show(mdk_rdev_t *rdev, char *page)
1703{
1704 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1705}
1706
1707static ssize_t
1708rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1709{
1710 char *e;
1711 unsigned long long size = simple_strtoull(buf, &e, 10);
1712 if (e==buf || (*e && *e != '\n'))
1713 return -EINVAL;
1714 if (rdev->mddev->pers)
1715 return -EBUSY;
1716 rdev->size = size;
1717 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1718 rdev->mddev->size = size;
1719 return len;
1720}
1721
1722static struct rdev_sysfs_entry rdev_size =
1723__ATTR(size, 0644, rdev_size_show, rdev_size_store);
1724
86e6ffdd
N		 1725static struct attribute *rdev_default_attrs[] = {
1726 &rdev_state.attr,
1727 &rdev_super.attr,
4dbcdc75 1728 &rdev_errors.attr,
014236d2 1729 &rdev_slot.attr,
93c8cad0 1730 &rdev_offset.attr,
83303b61 1731 &rdev_size.attr,
86e6ffdd
N		 1732 NULL,
1733};
1734static ssize_t
1735rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1736{
1737 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1738 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1739
1740 if (!entry->show)
1741 return -EIO;
1742 return entry->show(rdev, page);
1743}
1744
1745static ssize_t
1746rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1747 const char *page, size_t length)
1748{
1749 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1750 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1751
1752 if (!entry->store)
1753 return -EIO;
1754 return entry->store(rdev, page, length);
1755}
1756
1757static void rdev_free(struct kobject *ko)
1758{
1759 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1760 kfree(rdev);
1761}
1762static struct sysfs_ops rdev_sysfs_ops = {
1763 .show = rdev_attr_show,
1764 .store = rdev_attr_store,
1765};
1766static struct kobj_type rdev_ktype = {
1767 .release = rdev_free,
1768 .sysfs_ops = &rdev_sysfs_ops,
1769 .default_attrs = rdev_default_attrs,
1770};
1771
1da177e4
LT		 1772/*
1773 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1774 *
1775 * mark the device faulty if:
1776 *
1777 * - the device is nonexistent (zero size)
1778 * - the device has no valid superblock
1779 *
1780 * a faulty rdev _never_ has rdev->sb set.
1781 */
1782static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1783{
1784 char b[BDEVNAME_SIZE];
1785 int err;
1786 mdk_rdev_t *rdev;
1787 sector_t size;
1788
9ffae0cf 1789 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1da177e4
LT		 1790 if (!rdev) {
1791 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1792 return ERR_PTR(-ENOMEM);
1793 }
1da177e4
LT		 1794
1795 if ((err = alloc_disk_sb(rdev)))
1796 goto abort_free;
1797
1798 err = lock_rdev(rdev, newdev);
1799 if (err)
1800 goto abort_free;
1801
86e6ffdd
N		 1802 rdev->kobj.parent = NULL;
1803 rdev->kobj.ktype = &rdev_ktype;
1804 kobject_init(&rdev->kobj);
1805
1da177e4 1806 rdev->desc_nr = -1;
b2d444d7 1807 rdev->flags = 0;
1da177e4
LT		 1808 rdev->data_offset = 0;
1809 atomic_set(&rdev->nr_pending, 0);
ba22dcbf 1810 atomic_set(&rdev->read_errors, 0);
4dbcdc75 1811 atomic_set(&rdev->corrected_errors, 0);
1da177e4
LT		 1812
1813 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
1814 if (!size) {
1815 printk(KERN_WARNING
1816 "md: %s has zero or unknown size, marking faulty!\n",
1817 bdevname(rdev->bdev,b));
1818 err = -EINVAL;
1819 goto abort_free;
1820 }
1821
1822 if (super_format >= 0) {
1823 err = super_types[super_format].
1824 load_super(rdev, NULL, super_minor);
1825 if (err == -EINVAL) {
1826 printk(KERN_WARNING
1827 "md: %s has invalid sb, not importing!\n",
1828 bdevname(rdev->bdev,b));
1829 goto abort_free;
1830 }
1831 if (err < 0) {
1832 printk(KERN_WARNING
1833 "md: could not read %s's sb, not importing!\n",
1834 bdevname(rdev->bdev,b));
1835 goto abort_free;
1836 }
1837 }
1838 INIT_LIST_HEAD(&rdev->same_set);
1839
1840 return rdev;
1841
1842abort_free:
1843 if (rdev->sb_page) {
1844 if (rdev->bdev)
1845 unlock_rdev(rdev);
1846 free_disk_sb(rdev);
1847 }
1848 kfree(rdev);
1849 return ERR_PTR(err);
1850}
1851
1852/*
1853 * Check a full RAID array for plausibility
1854 */
1855
1856
a757e64c 1857static void analyze_sbs(mddev_t * mddev)
1da177e4
LT		 1858{
1859 int i;
1860 struct list_head *tmp;
1861 mdk_rdev_t *rdev, *freshest;
1862 char b[BDEVNAME_SIZE];
1863
1864 freshest = NULL;
1865 ITERATE_RDEV(mddev,rdev,tmp)
1866 switch (super_types[mddev->major_version].
1867 load_super(rdev, freshest, mddev->minor_version)) {
1868 case 1:
1869 freshest = rdev;
1870 break;
1871 case 0:
1872 break;
1873 default:
1874 printk( KERN_ERR \
1875 "md: fatal superblock inconsistency in %s"
1876 " -- removing from array\n",
1877 bdevname(rdev->bdev,b));
1878 kick_rdev_from_array(rdev);
1879 }
1880
1881
1882 super_types[mddev->major_version].
1883 validate_super(mddev, freshest);
1884
1885 i = 0;
1886 ITERATE_RDEV(mddev,rdev,tmp) {
1887 if (rdev != freshest)
1888 if (super_types[mddev->major_version].
1889 validate_super(mddev, rdev)) {
1890 printk(KERN_WARNING "md: kicking non-fresh %s"
1891 " from array!\n",
1892 bdevname(rdev->bdev,b));
1893 kick_rdev_from_array(rdev);
1894 continue;
1895 }
1896 if (mddev->level == LEVEL_MULTIPATH) {
1897 rdev->desc_nr = i++;
1898 rdev->raid_disk = rdev->desc_nr;
b2d444d7 1899 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1900 }
1901 }
1902
1903
1904
1905 if (mddev->recovery_cp != MaxSector &&
1906 mddev->level >= 1)
1907 printk(KERN_ERR "md: %s: raid array is not clean"
1908 " -- starting background reconstruction\n",
1909 mdname(mddev));
1910
1da177e4
LT		 1911}
1912
eae1701f 1913static ssize_t
96de1e66 1914level_show(mddev_t *mddev, char *page)
eae1701f 1915{
2604b703 1916 struct mdk_personality *p = mddev->pers;
d9d166c2 1917 if (p)
eae1701f 1918 return sprintf(page, "%s\n", p->name);
d9d166c2
N		 1919 else if (mddev->clevel[0])
1920 return sprintf(page, "%s\n", mddev->clevel);
1921 else if (mddev->level != LEVEL_NONE)
1922 return sprintf(page, "%d\n", mddev->level);
1923 else
1924 return 0;
eae1701f
N		 1925}
1926
d9d166c2
N		 1927static ssize_t
1928level_store(mddev_t *mddev, const char *buf, size_t len)
1929{
1930 int rv = len;
1931 if (mddev->pers)
1932 return -EBUSY;
1933 if (len == 0)
1934 return 0;
1935 if (len >= sizeof(mddev->clevel))
1936 return -ENOSPC;
1937 strncpy(mddev->clevel, buf, len);
1938 if (mddev->clevel[len-1] == '\n')
1939 len--;
1940 mddev->clevel[len] = 0;
1941 mddev->level = LEVEL_NONE;
1942 return rv;
1943}
1944
1945static struct md_sysfs_entry md_level =
1946__ATTR(level, 0644, level_show, level_store);
eae1701f
N		 1947
1948static ssize_t
96de1e66 1949raid_disks_show(mddev_t *mddev, char *page)
eae1701f 1950{
bb636547
N		 1951 if (mddev->raid_disks == 0)
1952 return 0;
eae1701f
N		 1953 return sprintf(page, "%d\n", mddev->raid_disks);
1954}
1955
da943b99
N		 1956static int update_raid_disks(mddev_t *mddev, int raid_disks);
1957
1958static ssize_t
1959raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
1960{
1961 /* can only set raid_disks if array is not yet active */
1962 char *e;
1963 int rv = 0;
1964 unsigned long n = simple_strtoul(buf, &e, 10);
1965
1966 if (!*buf || (*e && *e != '\n'))
1967 return -EINVAL;
1968
1969 if (mddev->pers)
1970 rv = update_raid_disks(mddev, n);
1971 else
1972 mddev->raid_disks = n;
1973 return rv ? rv : len;
1974}
1975static struct md_sysfs_entry md_raid_disks =
1976__ATTR(raid_disks, 0644, raid_disks_show, raid_disks_store);
eae1701f 1977
3b34380a
N		 1978static ssize_t
1979chunk_size_show(mddev_t *mddev, char *page)
1980{
1981 return sprintf(page, "%d\n", mddev->chunk_size);
1982}
1983
1984static ssize_t
1985chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
1986{
1987 /* can only set chunk_size if array is not yet active */
1988 char *e;
1989 unsigned long n = simple_strtoul(buf, &e, 10);
1990
1991 if (mddev->pers)
1992 return -EBUSY;
1993 if (!*buf || (*e && *e != '\n'))
1994 return -EINVAL;
1995
1996 mddev->chunk_size = n;
1997 return len;
1998}
1999static struct md_sysfs_entry md_chunk_size =
2000__ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
2001
6d7ff738
N		 2002static ssize_t
2003null_show(mddev_t *mddev, char *page)
2004{
2005 return -EINVAL;
2006}
2007
2008static ssize_t
2009new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2010{
2011 /* buf must be %d:%d\n? giving major and minor numbers */
2012 /* The new device is added to the array.
2013 * If the array has a persistent superblock, we read the
2014 * superblock to initialise info and check validity.
2015 * Otherwise, only checking done is that in bind_rdev_to_array,
2016 * which mainly checks size.
2017 */
2018 char *e;
2019 int major = simple_strtoul(buf, &e, 10);
2020 int minor;
2021 dev_t dev;
2022 mdk_rdev_t *rdev;
2023 int err;
2024
2025 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2026 return -EINVAL;
2027 minor = simple_strtoul(e+1, &e, 10);
2028 if (*e && *e != '\n')
2029 return -EINVAL;
2030 dev = MKDEV(major, minor);
2031 if (major != MAJOR(dev) ||
2032 minor != MINOR(dev))
2033 return -EOVERFLOW;
2034
2035
2036 if (mddev->persistent) {
2037 rdev = md_import_device(dev, mddev->major_version,
2038 mddev->minor_version);
2039 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2040 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2041 mdk_rdev_t, same_set);
2042 err = super_types[mddev->major_version]
2043 .load_super(rdev, rdev0, mddev->minor_version);
2044 if (err < 0)
2045 goto out;
2046 }
2047 } else
2048 rdev = md_import_device(dev, -1, -1);
2049
2050 if (IS_ERR(rdev))
2051 return PTR_ERR(rdev);
2052 err = bind_rdev_to_array(rdev, mddev);
2053 out:
2054 if (err)
2055 export_rdev(rdev);
2056 return err ? err : len;
2057}
2058
2059static struct md_sysfs_entry md_new_device =
2060__ATTR(new_dev, 0200, null_show, new_dev_store);
3b34380a 2061
a35b0d69
N		 2062static ssize_t
2063size_show(mddev_t *mddev, char *page)
2064{
2065 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2066}
2067
2068static int update_size(mddev_t *mddev, unsigned long size);
2069
2070static ssize_t
2071size_store(mddev_t *mddev, const char *buf, size_t len)
2072{
2073 /* If array is inactive, we can reduce the component size, but
2074 * not increase it (except from 0).
2075 * If array is active, we can try an on-line resize
2076 */
2077 char *e;
2078 int err = 0;
2079 unsigned long long size = simple_strtoull(buf, &e, 10);
2080 if (!*buf || *buf == '\n' ||
2081 (*e && *e != '\n'))
2082 return -EINVAL;
2083
2084 if (mddev->pers) {
2085 err = update_size(mddev, size);
2086 md_update_sb(mddev);
2087 } else {
2088 if (mddev->size == 0 ||
2089 mddev->size > size)
2090 mddev->size = size;
2091 else
2092 err = -ENOSPC;
2093 }
2094 return err ? err : len;
2095}
2096
2097static struct md_sysfs_entry md_size =
2098__ATTR(component_size, 0644, size_show, size_store);
2099
8bb93aac
N		 2100
2101/* Metdata version.
2102 * This is either 'none' for arrays with externally managed metadata,
2103 * or N.M for internally known formats
2104 */
2105static ssize_t
2106metadata_show(mddev_t *mddev, char *page)
2107{
2108 if (mddev->persistent)
2109 return sprintf(page, "%d.%d\n",
2110 mddev->major_version, mddev->minor_version);
2111 else
2112 return sprintf(page, "none\n");
2113}
2114
2115static ssize_t
2116metadata_store(mddev_t *mddev, const char *buf, size_t len)
2117{
2118 int major, minor;
2119 char *e;
2120 if (!list_empty(&mddev->disks))
2121 return -EBUSY;
2122
2123 if (cmd_match(buf, "none")) {
2124 mddev->persistent = 0;
2125 mddev->major_version = 0;
2126 mddev->minor_version = 90;
2127 return len;
2128 }
2129 major = simple_strtoul(buf, &e, 10);
2130 if (e==buf || *e != '.')
2131 return -EINVAL;
2132 buf = e+1;
2133 minor = simple_strtoul(buf, &e, 10);
2134 if (e==buf || *e != '\n')
2135 return -EINVAL;
2136 if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
2137 super_types[major].name == NULL)
2138 return -ENOENT;
2139 mddev->major_version = major;
2140 mddev->minor_version = minor;
2141 mddev->persistent = 1;
2142 return len;
2143}
2144
2145static struct md_sysfs_entry md_metadata =
2146__ATTR(metadata_version, 0644, metadata_show, metadata_store);
2147
24dd469d 2148static ssize_t
7eec314d 2149action_show(mddev_t *mddev, char *page)
24dd469d 2150{
7eec314d 2151 char *type = "idle";
31399d9e
N		 2152 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2153 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
2154 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N		 2155 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2156 type = "resync";
2157 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2158 type = "check";
2159 else
2160 type = "repair";
2161 } else
2162 type = "recover";
2163 }
2164 return sprintf(page, "%s\n", type);
2165}
2166
2167static ssize_t
7eec314d 2168action_store(mddev_t *mddev, const char *page, size_t len)
24dd469d 2169{
7eec314d
N		 2170 if (!mddev->pers || !mddev->pers->sync_request)
2171 return -EINVAL;
2172
bce74dac 2173 if (cmd_match(page, "idle")) {
7eec314d
N		 2174 if (mddev->sync_thread) {
2175 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2176 md_unregister_thread(mddev->sync_thread);
2177 mddev->sync_thread = NULL;
2178 mddev->recovery = 0;
2179 }
03c902e1
N		 2180 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2181 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 2182 return -EBUSY;
03c902e1 2183 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
7eec314d
N		 2184 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2185 else {
bce74dac 2186 if (cmd_match(page, "check"))
7eec314d 2187 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
bce74dac 2188 else if (cmd_match(page, "repair"))
7eec314d
N		 2189 return -EINVAL;
2190 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2191 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7eec314d 2192 }
03c902e1 2193 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d
N		 2194 md_wakeup_thread(mddev->thread);
2195 return len;
2196}
2197
9d88883e 2198static ssize_t
96de1e66 2199mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 2200{
2201 return sprintf(page, "%llu\n",
2202 (unsigned long long) mddev->resync_mismatches);
2203}
2204
96de1e66 2205static struct md_sysfs_entry
7eec314d 2206md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 2207
96de1e66
N		 2208
2209static struct md_sysfs_entry
2210md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 2211
88202a0c
N		 2212static ssize_t
2213sync_min_show(mddev_t *mddev, char *page)
2214{
2215 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2216 mddev->sync_speed_min ? "local": "system");
2217}
2218
2219static ssize_t
2220sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2221{
2222 int min;
2223 char *e;
2224 if (strncmp(buf, "system", 6)==0) {
2225 mddev->sync_speed_min = 0;
2226 return len;
2227 }
2228 min = simple_strtoul(buf, &e, 10);
2229 if (buf == e || (*e && *e != '\n') || min <= 0)
2230 return -EINVAL;
2231 mddev->sync_speed_min = min;
2232 return len;
2233}
2234
2235static struct md_sysfs_entry md_sync_min =
2236__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2237
2238static ssize_t
2239sync_max_show(mddev_t *mddev, char *page)
2240{
2241 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2242 mddev->sync_speed_max ? "local": "system");
2243}
2244
2245static ssize_t
2246sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2247{
2248 int max;
2249 char *e;
2250 if (strncmp(buf, "system", 6)==0) {
2251 mddev->sync_speed_max = 0;
2252 return len;
2253 }
2254 max = simple_strtoul(buf, &e, 10);
2255 if (buf == e || (*e && *e != '\n') || max <= 0)
2256 return -EINVAL;
2257 mddev->sync_speed_max = max;
2258 return len;
2259}
2260
2261static struct md_sysfs_entry md_sync_max =
2262__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2263
2264
2265static ssize_t
2266sync_speed_show(mddev_t *mddev, char *page)
2267{
2268 unsigned long resync, dt, db;
2269 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2270 dt = ((jiffies - mddev->resync_mark) / HZ);
2271 if (!dt) dt++;
2272 db = resync - (mddev->resync_mark_cnt);
2273 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2274}
2275
2276static struct md_sysfs_entry
2277md_sync_speed = __ATTR_RO(sync_speed);
2278
2279static ssize_t
2280sync_completed_show(mddev_t *mddev, char *page)
2281{
2282 unsigned long max_blocks, resync;
2283
2284 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2285 max_blocks = mddev->resync_max_sectors;
2286 else
2287 max_blocks = mddev->size << 1;
2288
2289 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2290 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2291}
2292
2293static struct md_sysfs_entry
2294md_sync_completed = __ATTR_RO(sync_completed);
2295
eae1701f
N		 2296static struct attribute *md_default_attrs[] = {
2297 &md_level.attr,
2298 &md_raid_disks.attr,
3b34380a 2299 &md_chunk_size.attr,
a35b0d69 2300 &md_size.attr,
8bb93aac 2301 &md_metadata.attr,
6d7ff738 2302 &md_new_device.attr,
411036fa
N		 2303 NULL,
2304};
2305
2306static struct attribute *md_redundancy_attrs[] = {
24dd469d 2307 &md_scan_mode.attr,
9d88883e 2308 &md_mismatches.attr,
88202a0c
N		 2309 &md_sync_min.attr,
2310 &md_sync_max.attr,
2311 &md_sync_speed.attr,
2312 &md_sync_completed.attr,
eae1701f
N		 2313 NULL,
2314};
411036fa
N		 2315static struct attribute_group md_redundancy_group = {
2316 .name = NULL,
2317 .attrs = md_redundancy_attrs,
2318};
2319
eae1701f
N		 2320
2321static ssize_t
2322md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2323{
2324 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2325 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2326 ssize_t rv;
eae1701f
N		 2327
2328 if (!entry->show)
2329 return -EIO;
96de1e66
N		 2330 mddev_lock(mddev);
2331 rv = entry->show(mddev, page);
2332 mddev_unlock(mddev);
2333 return rv;
eae1701f
N		 2334}
2335
2336static ssize_t
2337md_attr_store(struct kobject *kobj, struct attribute *attr,
2338 const char *page, size_t length)
2339{
2340 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2341 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2342 ssize_t rv;
eae1701f
N		 2343
2344 if (!entry->store)
2345 return -EIO;
96de1e66
N		 2346 mddev_lock(mddev);
2347 rv = entry->store(mddev, page, length);
2348 mddev_unlock(mddev);
2349 return rv;
eae1701f
N		 2350}
2351
2352static void md_free(struct kobject *ko)
2353{
2354 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2355 kfree(mddev);
2356}
2357
2358static struct sysfs_ops md_sysfs_ops = {
2359 .show = md_attr_show,
2360 .store = md_attr_store,
2361};
2362static struct kobj_type md_ktype = {
2363 .release = md_free,
2364 .sysfs_ops = &md_sysfs_ops,
2365 .default_attrs = md_default_attrs,
2366};
2367
1da177e4
LT		 2368int mdp_major = 0;
2369
2370static struct kobject *md_probe(dev_t dev, int *part, void *data)
2371{
2372 static DECLARE_MUTEX(disks_sem);
2373 mddev_t *mddev = mddev_find(dev);
2374 struct gendisk *disk;
2375 int partitioned = (MAJOR(dev) != MD_MAJOR);
2376 int shift = partitioned ? MdpMinorShift : 0;
2377 int unit = MINOR(dev) >> shift;
2378
2379 if (!mddev)
2380 return NULL;
2381
2382 down(&disks_sem);
2383 if (mddev->gendisk) {
2384 up(&disks_sem);
2385 mddev_put(mddev);
2386 return NULL;
2387 }
2388 disk = alloc_disk(1 << shift);
2389 if (!disk) {
2390 up(&disks_sem);
2391 mddev_put(mddev);
2392 return NULL;
2393 }
2394 disk->major = MAJOR(dev);
2395 disk->first_minor = unit << shift;
2396 if (partitioned) {
2397 sprintf(disk->disk_name, "md_d%d", unit);
2398 sprintf(disk->devfs_name, "md/d%d", unit);
2399 } else {
2400 sprintf(disk->disk_name, "md%d", unit);
2401 sprintf(disk->devfs_name, "md/%d", unit);
2402 }
2403 disk->fops = &md_fops;
2404 disk->private_data = mddev;
2405 disk->queue = mddev->queue;
2406 add_disk(disk);
2407 mddev->gendisk = disk;
2408 up(&disks_sem);
9c791977 2409 mddev->kobj.parent = &disk->kobj;
eae1701f
N		 2410 mddev->kobj.k_name = NULL;
2411 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
2412 mddev->kobj.ktype = &md_ktype;
2413 kobject_register(&mddev->kobj);
1da177e4
LT		 2414 return NULL;
2415}
2416
2417void md_wakeup_thread(mdk_thread_t *thread);
2418
2419static void md_safemode_timeout(unsigned long data)
2420{
2421 mddev_t *mddev = (mddev_t *) data;
2422
2423 mddev->safemode = 1;
2424 md_wakeup_thread(mddev->thread);
2425}
2426
6ff8d8ec 2427static int start_dirty_degraded;
1da177e4
LT		 2428
2429static int do_md_run(mddev_t * mddev)
2430{
2604b703 2431 int err;
1da177e4
LT		 2432 int chunk_size;
2433 struct list_head *tmp;
2434 mdk_rdev_t *rdev;
2435 struct gendisk *disk;
2604b703 2436 struct mdk_personality *pers;
1da177e4
LT		 2437 char b[BDEVNAME_SIZE];
2438
a757e64c
N		 2439 if (list_empty(&mddev->disks))
2440 /* cannot run an array with no devices.. */
1da177e4 2441 return -EINVAL;
1da177e4
LT		 2442
2443 if (mddev->pers)
2444 return -EBUSY;
2445
2446 /*
2447 * Analyze all RAID superblock(s)
2448 */
a757e64c
N		 2449 if (!mddev->raid_disks)
2450 analyze_sbs(mddev);
1da177e4
LT		 2451
2452 chunk_size = mddev->chunk_size;
2604b703
N		 2453
2454 if (chunk_size) {
1da177e4
LT		 2455 if (chunk_size > MAX_CHUNK_SIZE) {
2456 printk(KERN_ERR "too big chunk_size: %d > %d\n",
2457 chunk_size, MAX_CHUNK_SIZE);
2458 return -EINVAL;
2459 }
2460 /*
2461 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2462 */
2463 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 2464 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 2465 return -EINVAL;
2466 }
2467 if (chunk_size < PAGE_SIZE) {
2468 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
2469 chunk_size, PAGE_SIZE);
2470 return -EINVAL;
2471 }
2472
2473 /* devices must have minimum size of one chunk */
2474 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2475 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2476 continue;
2477 if (rdev->size < chunk_size / 1024) {
2478 printk(KERN_WARNING
2479 "md: Dev %s smaller than chunk_size:"
2480 " %lluk < %dk\n",
2481 bdevname(rdev->bdev,b),
2482 (unsigned long long)rdev->size,
2483 chunk_size / 1024);
2484 return -EINVAL;
2485 }
2486 }
2487 }
2488
1da177e4 2489#ifdef CONFIG_KMOD
d9d166c2
N		 2490 if (mddev->level != LEVEL_NONE)
2491 request_module("md-level-%d", mddev->level);
2492 else if (mddev->clevel[0])
2493 request_module("md-%s", mddev->clevel);
1da177e4
LT		 2494#endif
2495
2496 /*
2497 * Drop all container device buffers, from now on
2498 * the only valid external interface is through the md
2499 * device.
2500 * Also find largest hardsector size
2501 */
2502 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2503 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2504 continue;
2505 sync_blockdev(rdev->bdev);
2506 invalidate_bdev(rdev->bdev, 0);
2507 }
2508
2509 md_probe(mddev->unit, NULL, NULL);
2510 disk = mddev->gendisk;
2511 if (!disk)
2512 return -ENOMEM;
2513
2514 spin_lock(&pers_lock);
d9d166c2 2515 pers = find_pers(mddev->level, mddev->clevel);
2604b703 2516 if (!pers || !try_module_get(pers->owner)) {
1da177e4 2517 spin_unlock(&pers_lock);
d9d166c2
N		 2518 if (mddev->level != LEVEL_NONE)
2519 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
2520 mddev->level);
2521 else
2522 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
2523 mddev->clevel);
1da177e4
LT		 2524 return -EINVAL;
2525 }
2604b703 2526 mddev->pers = pers;
1da177e4 2527 spin_unlock(&pers_lock);
d9d166c2
N		 2528 mddev->level = pers->level;
2529 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
1da177e4 2530
657390d2 2531 mddev->recovery = 0;
1da177e4 2532 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 2533 mddev->barriers_work = 1;
6ff8d8ec 2534 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 2535
f91de92e
N		 2536 if (start_readonly)
2537 mddev->ro = 2; /* read-only, but switch on first write */
2538
b15c2e57
N		 2539 err = mddev->pers->run(mddev);
2540 if (!err && mddev->pers->sync_request) {
2541 err = bitmap_create(mddev);
2542 if (err) {
2543 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
2544 mdname(mddev), err);
2545 mddev->pers->stop(mddev);
2546 }
2547 }
1da177e4
LT		 2548 if (err) {
2549 printk(KERN_ERR "md: pers->run() failed ...\n");
2550 module_put(mddev->pers->owner);
2551 mddev->pers = NULL;
32a7627c
N		 2552 bitmap_destroy(mddev);
2553 return err;
1da177e4 2554 }
411036fa
N		 2555 if (mddev->pers->sync_request)
2556 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
fd9d49ca
N		 2557 else if (mddev->ro == 2) /* auto-readonly not meaningful */
2558 mddev->ro = 0;
2559
1da177e4
LT		 2560 atomic_set(&mddev->writes_pending,0);
2561 mddev->safemode = 0;
2562 mddev->safemode_timer.function = md_safemode_timeout;
2563 mddev->safemode_timer.data = (unsigned long) mddev;
2564 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */
2565 mddev->in_sync = 1;
86e6ffdd
N		 2566
2567 ITERATE_RDEV(mddev,rdev,tmp)
2568 if (rdev->raid_disk >= 0) {
2569 char nm[20];
2570 sprintf(nm, "rd%d", rdev->raid_disk);
2571 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2572 }
1da177e4
LT		 2573
2574 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 2575 md_wakeup_thread(mddev->thread);
1da177e4
LT		 2576
2577 if (mddev->sb_dirty)
2578 md_update_sb(mddev);
2579
2580 set_capacity(disk, mddev->array_size<<1);
2581
2582 /* If we call blk_queue_make_request here, it will
2583 * re-initialise max_sectors etc which may have been
2584 * refined inside -> run. So just set the bits we need to set.
2585 * Most initialisation happended when we called
2586 * blk_queue_make_request(..., md_fail_request)
2587 * earlier.
2588 */
2589 mddev->queue->queuedata = mddev;
2590 mddev->queue->make_request_fn = mddev->pers->make_request;
2591
2592 mddev->changed = 1;
d7603b7e 2593 md_new_event(mddev);
1da177e4
LT		 2594 return 0;
2595}
2596
2597static int restart_array(mddev_t *mddev)
2598{
2599 struct gendisk *disk = mddev->gendisk;
2600 int err;
2601
2602 /*
2603 * Complain if it has no devices
2604 */
2605 err = -ENXIO;
2606 if (list_empty(&mddev->disks))
2607 goto out;
2608
2609 if (mddev->pers) {
2610 err = -EBUSY;
2611 if (!mddev->ro)
2612 goto out;
2613
2614 mddev->safemode = 0;
2615 mddev->ro = 0;
2616 set_disk_ro(disk, 0);
2617
2618 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2619 mdname(mddev));
2620 /*
2621 * Kick recovery or resync if necessary
2622 */
2623 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2624 md_wakeup_thread(mddev->thread);
2625 err = 0;
2626 } else {
2627 printk(KERN_ERR "md: %s has no personality assigned.\n",
2628 mdname(mddev));
2629 err = -EINVAL;
2630 }
2631
2632out:
2633 return err;
2634}
2635
2636static int do_md_stop(mddev_t * mddev, int ro)
2637{
2638 int err = 0;
2639 struct gendisk *disk = mddev->gendisk;
2640
2641 if (mddev->pers) {
2642 if (atomic_read(&mddev->active)>2) {
2643 printk("md: %s still in use.\n",mdname(mddev));
2644 return -EBUSY;
2645 }
2646
2647 if (mddev->sync_thread) {
2648 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2649 md_unregister_thread(mddev->sync_thread);
2650 mddev->sync_thread = NULL;
2651 }
2652
2653 del_timer_sync(&mddev->safemode_timer);
2654
2655 invalidate_partition(disk, 0);
2656
2657 if (ro) {
2658 err = -ENXIO;
f91de92e 2659 if (mddev->ro==1)
1da177e4
LT		 2660 goto out;
2661 mddev->ro = 1;
2662 } else {
6b8b3e8a 2663 bitmap_flush(mddev);
a9701a30 2664 md_super_wait(mddev);
1da177e4
LT		 2665 if (mddev->ro)
2666 set_disk_ro(disk, 0);
2667 blk_queue_make_request(mddev->queue, md_fail_request);
2668 mddev->pers->stop(mddev);
411036fa
N		 2669 if (mddev->pers->sync_request)
2670 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
2671
1da177e4
LT		 2672 module_put(mddev->pers->owner);
2673 mddev->pers = NULL;
2674 if (mddev->ro)
2675 mddev->ro = 0;
2676 }
2677 if (!mddev->in_sync) {
2678 /* mark array as shutdown cleanly */
2679 mddev->in_sync = 1;
2680 md_update_sb(mddev);
2681 }
2682 if (ro)
2683 set_disk_ro(disk, 1);
2684 }
32a7627c
N		 2685
2686 bitmap_destroy(mddev);
2687 if (mddev->bitmap_file) {
2688 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
2689 fput(mddev->bitmap_file);
2690 mddev->bitmap_file = NULL;
2691 }
9223214e 2692 mddev->bitmap_offset = 0;
32a7627c 2693
1da177e4
LT		 2694 /*
2695 * Free resources if final stop
2696 */
2697 if (!ro) {
86e6ffdd
N		 2698 mdk_rdev_t *rdev;
2699 struct list_head *tmp;
1da177e4
LT		 2700 struct gendisk *disk;
2701 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
2702
86e6ffdd
N		 2703 ITERATE_RDEV(mddev,rdev,tmp)
2704 if (rdev->raid_disk >= 0) {
2705 char nm[20];
2706 sprintf(nm, "rd%d", rdev->raid_disk);
2707 sysfs_remove_link(&mddev->kobj, nm);
2708 }
2709
1da177e4
LT		 2710 export_array(mddev);
2711
2712 mddev->array_size = 0;
2713 disk = mddev->gendisk;
2714 if (disk)
2715 set_capacity(disk, 0);
2716 mddev->changed = 1;
2717 } else
2718 printk(KERN_INFO "md: %s switched to read-only mode.\n",
2719 mdname(mddev));
2720 err = 0;
d7603b7e 2721 md_new_event(mddev);
1da177e4
LT		 2722out:
2723 return err;
2724}
2725
2726static void autorun_array(mddev_t *mddev)
2727{
2728 mdk_rdev_t *rdev;
2729 struct list_head *tmp;
2730 int err;
2731
a757e64c 2732 if (list_empty(&mddev->disks))
1da177e4 2733 return;
1da177e4
LT		 2734
2735 printk(KERN_INFO "md: running: ");
2736
2737 ITERATE_RDEV(mddev,rdev,tmp) {
2738 char b[BDEVNAME_SIZE];
2739 printk("<%s>", bdevname(rdev->bdev,b));
2740 }
2741 printk("\n");
2742
2743 err = do_md_run (mddev);
2744 if (err) {
2745 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
2746 do_md_stop (mddev, 0);
2747 }
2748}
2749
2750/*
2751 * lets try to run arrays based on all disks that have arrived
2752 * until now. (those are in pending_raid_disks)
2753 *
2754 * the method: pick the first pending disk, collect all disks with
2755 * the same UUID, remove all from the pending list and put them into
2756 * the 'same_array' list. Then order this list based on superblock
2757 * update time (freshest comes first), kick out 'old' disks and
2758 * compare superblocks. If everything's fine then run it.
2759 *
2760 * If "unit" is allocated, then bump its reference count
2761 */
2762static void autorun_devices(int part)
2763{
2764 struct list_head candidates;
2765 struct list_head *tmp;
2766 mdk_rdev_t *rdev0, *rdev;
2767 mddev_t *mddev;
2768 char b[BDEVNAME_SIZE];
2769
2770 printk(KERN_INFO "md: autorun ...\n");
2771 while (!list_empty(&pending_raid_disks)) {
2772 dev_t dev;
2773 rdev0 = list_entry(pending_raid_disks.next,
2774 mdk_rdev_t, same_set);
2775
2776 printk(KERN_INFO "md: considering %s ...\n",
2777 bdevname(rdev0->bdev,b));
2778 INIT_LIST_HEAD(&candidates);
2779 ITERATE_RDEV_PENDING(rdev,tmp)
2780 if (super_90_load(rdev, rdev0, 0) >= 0) {
2781 printk(KERN_INFO "md: adding %s ...\n",
2782 bdevname(rdev->bdev,b));
2783 list_move(&rdev->same_set, &candidates);
2784 }
2785 /*
2786 * now we have a set of devices, with all of them having
2787 * mostly sane superblocks. It's time to allocate the
2788 * mddev.
2789 */
2790 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
2791 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
2792 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
2793 break;
2794 }
2795 if (part)
2796 dev = MKDEV(mdp_major,
2797 rdev0->preferred_minor << MdpMinorShift);
2798 else
2799 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
2800
2801 md_probe(dev, NULL, NULL);
2802 mddev = mddev_find(dev);
2803 if (!mddev) {
2804 printk(KERN_ERR
2805 "md: cannot allocate memory for md drive.\n");
2806 break;
2807 }
2808 if (mddev_lock(mddev))
2809 printk(KERN_WARNING "md: %s locked, cannot run\n",
2810 mdname(mddev));
2811 else if (mddev->raid_disks || mddev->major_version
2812 || !list_empty(&mddev->disks)) {
2813 printk(KERN_WARNING
2814 "md: %s already running, cannot run %s\n",
2815 mdname(mddev), bdevname(rdev0->bdev,b));
2816 mddev_unlock(mddev);
2817 } else {
2818 printk(KERN_INFO "md: created %s\n", mdname(mddev));
2819 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
2820 list_del_init(&rdev->same_set);
2821 if (bind_rdev_to_array(rdev, mddev))
2822 export_rdev(rdev);
2823 }
2824 autorun_array(mddev);
2825 mddev_unlock(mddev);
2826 }
2827 /* on success, candidates will be empty, on error
2828 * it won't...
2829 */
2830 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
2831 export_rdev(rdev);
2832 mddev_put(mddev);
2833 }
2834 printk(KERN_INFO "md: ... autorun DONE.\n");
2835}
2836
2837/*
2838 * import RAID devices based on one partition
2839 * if possible, the array gets run as well.
2840 */
2841
2842static int autostart_array(dev_t startdev)
2843{
2844 char b[BDEVNAME_SIZE];
2845 int err = -EINVAL, i;
2846 mdp_super_t *sb = NULL;
2847 mdk_rdev_t *start_rdev = NULL, *rdev;
2848
2849 start_rdev = md_import_device(startdev, 0, 0);
2850 if (IS_ERR(start_rdev))
2851 return err;
2852
2853
2854 /* NOTE: this can only work for 0.90.0 superblocks */
2855 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
2856 if (sb->major_version != 0 ||
2857 sb->minor_version != 90 ) {
2858 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
2859 export_rdev(start_rdev);
2860 return err;
2861 }
2862
b2d444d7 2863 if (test_bit(Faulty, &start_rdev->flags)) {
1da177e4
LT		 2864 printk(KERN_WARNING
2865 "md: can not autostart based on faulty %s!\n",
2866 bdevname(start_rdev->bdev,b));
2867 export_rdev(start_rdev);
2868 return err;
2869 }
2870 list_add(&start_rdev->same_set, &pending_raid_disks);
2871
2872 for (i = 0; i < MD_SB_DISKS; i++) {
2873 mdp_disk_t *desc = sb->disks + i;
2874 dev_t dev = MKDEV(desc->major, desc->minor);
2875
2876 if (!dev)
2877 continue;
2878 if (dev == startdev)
2879 continue;
2880 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
2881 continue;
2882 rdev = md_import_device(dev, 0, 0);
2883 if (IS_ERR(rdev))
2884 continue;
2885
2886 list_add(&rdev->same_set, &pending_raid_disks);
2887 }
2888
2889 /*
2890 * possibly return codes
2891 */
2892 autorun_devices(0);
2893 return 0;
2894
2895}
2896
2897
2898static int get_version(void __user * arg)
2899{
2900 mdu_version_t ver;
2901
2902 ver.major = MD_MAJOR_VERSION;
2903 ver.minor = MD_MINOR_VERSION;
2904 ver.patchlevel = MD_PATCHLEVEL_VERSION;
2905
2906 if (copy_to_user(arg, &ver, sizeof(ver)))
2907 return -EFAULT;
2908
2909 return 0;
2910}
2911
2912static int get_array_info(mddev_t * mddev, void __user * arg)
2913{
2914 mdu_array_info_t info;
2915 int nr,working,active,failed,spare;
2916 mdk_rdev_t *rdev;
2917 struct list_head *tmp;
2918
2919 nr=working=active=failed=spare=0;
2920 ITERATE_RDEV(mddev,rdev,tmp) {
2921 nr++;
b2d444d7 2922 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2923 failed++;
2924 else {
2925 working++;
b2d444d7 2926 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 2927 active++;
2928 else
2929 spare++;
2930 }
2931 }
2932
2933 info.major_version = mddev->major_version;
2934 info.minor_version = mddev->minor_version;
2935 info.patch_version = MD_PATCHLEVEL_VERSION;
2936 info.ctime = mddev->ctime;
2937 info.level = mddev->level;
2938 info.size = mddev->size;
2939 info.nr_disks = nr;
2940 info.raid_disks = mddev->raid_disks;
2941 info.md_minor = mddev->md_minor;
2942 info.not_persistent= !mddev->persistent;
2943
2944 info.utime = mddev->utime;
2945 info.state = 0;
2946 if (mddev->in_sync)
2947 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 2948 if (mddev->bitmap && mddev->bitmap_offset)
2949 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 2950 info.active_disks = active;
2951 info.working_disks = working;
2952 info.failed_disks = failed;
2953 info.spare_disks = spare;
2954
2955 info.layout = mddev->layout;
2956 info.chunk_size = mddev->chunk_size;
2957
2958 if (copy_to_user(arg, &info, sizeof(info)))
2959 return -EFAULT;
2960
2961 return 0;
2962}
2963
87162a28 2964static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 2965{
2966 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
2967 char *ptr, *buf = NULL;
2968 int err = -ENOMEM;
2969
2970 file = kmalloc(sizeof(*file), GFP_KERNEL);
2971 if (!file)
2972 goto out;
2973
2974 /* bitmap disabled, zero the first byte and copy out */
2975 if (!mddev->bitmap || !mddev->bitmap->file) {
2976 file->pathname[0] = '\0';
2977 goto copy_out;
2978 }
2979
2980 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
2981 if (!buf)
2982 goto out;
2983
2984 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
2985 if (!ptr)
2986 goto out;
2987
2988 strcpy(file->pathname, ptr);
2989
2990copy_out:
2991 err = 0;
2992 if (copy_to_user(arg, file, sizeof(*file)))
2993 err = -EFAULT;
2994out:
2995 kfree(buf);
2996 kfree(file);
2997 return err;
2998}
2999
1da177e4
LT		 3000static int get_disk_info(mddev_t * mddev, void __user * arg)
3001{
3002 mdu_disk_info_t info;
3003 unsigned int nr;
3004 mdk_rdev_t *rdev;
3005
3006 if (copy_from_user(&info, arg, sizeof(info)))
3007 return -EFAULT;
3008
3009 nr = info.number;
3010
3011 rdev = find_rdev_nr(mddev, nr);
3012 if (rdev) {
3013 info.major = MAJOR(rdev->bdev->bd_dev);
3014 info.minor = MINOR(rdev->bdev->bd_dev);
3015 info.raid_disk = rdev->raid_disk;
3016 info.state = 0;
b2d444d7 3017 if (test_bit(Faulty, &rdev->flags))
1da177e4 3018 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 3019 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 3020 info.state |= (1<<MD_DISK_ACTIVE);
3021 info.state |= (1<<MD_DISK_SYNC);
3022 }
8ddf9efe
N		 3023 if (test_bit(WriteMostly, &rdev->flags))
3024 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 3025 } else {
3026 info.major = info.minor = 0;
3027 info.raid_disk = -1;
3028 info.state = (1<<MD_DISK_REMOVED);
3029 }
3030
3031 if (copy_to_user(arg, &info, sizeof(info)))
3032 return -EFAULT;
3033
3034 return 0;
3035}
3036
3037static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3038{
3039 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3040 mdk_rdev_t *rdev;
3041 dev_t dev = MKDEV(info->major,info->minor);
3042
3043 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3044 return -EOVERFLOW;
3045
3046 if (!mddev->raid_disks) {
3047 int err;
3048 /* expecting a device which has a superblock */
3049 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3050 if (IS_ERR(rdev)) {
3051 printk(KERN_WARNING
3052 "md: md_import_device returned %ld\n",
3053 PTR_ERR(rdev));
3054 return PTR_ERR(rdev);
3055 }
3056 if (!list_empty(&mddev->disks)) {
3057 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3058 mdk_rdev_t, same_set);
3059 int err = super_types[mddev->major_version]
3060 .load_super(rdev, rdev0, mddev->minor_version);
3061 if (err < 0) {
3062 printk(KERN_WARNING
3063 "md: %s has different UUID to %s\n",
3064 bdevname(rdev->bdev,b),
3065 bdevname(rdev0->bdev,b2));
3066 export_rdev(rdev);
3067 return -EINVAL;
3068 }
3069 }
3070 err = bind_rdev_to_array(rdev, mddev);
3071 if (err)
3072 export_rdev(rdev);
3073 return err;
3074 }
3075
3076 /*
3077 * add_new_disk can be used once the array is assembled
3078 * to add "hot spares". They must already have a superblock
3079 * written
3080 */
3081 if (mddev->pers) {
3082 int err;
3083 if (!mddev->pers->hot_add_disk) {
3084 printk(KERN_WARNING
3085 "%s: personality does not support diskops!\n",
3086 mdname(mddev));
3087 return -EINVAL;
3088 }
7b1e35f6
N		 3089 if (mddev->persistent)
3090 rdev = md_import_device(dev, mddev->major_version,
3091 mddev->minor_version);
3092 else
3093 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 3094 if (IS_ERR(rdev)) {
3095 printk(KERN_WARNING
3096 "md: md_import_device returned %ld\n",
3097 PTR_ERR(rdev));
3098 return PTR_ERR(rdev);
3099 }
41158c7e
N		 3100 /* set save_raid_disk if appropriate */
3101 if (!mddev->persistent) {
3102 if (info->state & (1<<MD_DISK_SYNC) &&
3103 info->raid_disk < mddev->raid_disks)
3104 rdev->raid_disk = info->raid_disk;
3105 else
3106 rdev->raid_disk = -1;
3107 } else
3108 super_types[mddev->major_version].
3109 validate_super(mddev, rdev);
3110 rdev->saved_raid_disk = rdev->raid_disk;
3111
b2d444d7 3112 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 3113 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3114 set_bit(WriteMostly, &rdev->flags);
3115
1da177e4
LT		 3116 rdev->raid_disk = -1;
3117 err = bind_rdev_to_array(rdev, mddev);
3118 if (err)
3119 export_rdev(rdev);
c361777f
N		 3120
3121 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 3122 md_wakeup_thread(mddev->thread);
1da177e4
LT		 3123 return err;
3124 }
3125
3126 /* otherwise, add_new_disk is only allowed
3127 * for major_version==0 superblocks
3128 */
3129 if (mddev->major_version != 0) {
3130 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3131 mdname(mddev));
3132 return -EINVAL;
3133 }
3134
3135 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3136 int err;
3137 rdev = md_import_device (dev, -1, 0);
3138 if (IS_ERR(rdev)) {
3139 printk(KERN_WARNING
3140 "md: error, md_import_device() returned %ld\n",
3141 PTR_ERR(rdev));
3142 return PTR_ERR(rdev);
3143 }
3144 rdev->desc_nr = info->number;
3145 if (info->raid_disk < mddev->raid_disks)
3146 rdev->raid_disk = info->raid_disk;
3147 else
3148 rdev->raid_disk = -1;
3149
b2d444d7
N		 3150 rdev->flags = 0;
3151
1da177e4 3152 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 3153 if (info->state & (1<<MD_DISK_SYNC))
3154 set_bit(In_sync, &rdev->flags);
1da177e4 3155
8ddf9efe
N		 3156 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3157 set_bit(WriteMostly, &rdev->flags);
3158
1da177e4
LT		 3159 if (!mddev->persistent) {
3160 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3161 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3162 } else
3163 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3164 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3165
2bf071bf
N		 3166 err = bind_rdev_to_array(rdev, mddev);
3167 if (err) {
3168 export_rdev(rdev);
3169 return err;
3170 }
1da177e4
LT		 3171 }
3172
3173 return 0;
3174}
3175
3176static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3177{
3178 char b[BDEVNAME_SIZE];
3179 mdk_rdev_t *rdev;
3180
3181 if (!mddev->pers)
3182 return -ENODEV;
3183
3184 rdev = find_rdev(mddev, dev);
3185 if (!rdev)
3186 return -ENXIO;
3187
3188 if (rdev->raid_disk >= 0)
3189 goto busy;
3190
3191 kick_rdev_from_array(rdev);
3192 md_update_sb(mddev);
d7603b7e 3193 md_new_event(mddev);
1da177e4
LT		 3194
3195 return 0;
3196busy:
3197 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3198 bdevname(rdev->bdev,b), mdname(mddev));
3199 return -EBUSY;
3200}
3201
3202static int hot_add_disk(mddev_t * mddev, dev_t dev)
3203{
3204 char b[BDEVNAME_SIZE];
3205 int err;
3206 unsigned int size;
3207 mdk_rdev_t *rdev;
3208
3209 if (!mddev->pers)
3210 return -ENODEV;
3211
3212 if (mddev->major_version != 0) {
3213 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3214 " version-0 superblocks.\n",
3215 mdname(mddev));
3216 return -EINVAL;
3217 }
3218 if (!mddev->pers->hot_add_disk) {
3219 printk(KERN_WARNING
3220 "%s: personality does not support diskops!\n",
3221 mdname(mddev));
3222 return -EINVAL;
3223 }
3224
3225 rdev = md_import_device (dev, -1, 0);
3226 if (IS_ERR(rdev)) {
3227 printk(KERN_WARNING
3228 "md: error, md_import_device() returned %ld\n",
3229 PTR_ERR(rdev));
3230 return -EINVAL;
3231 }
3232
3233 if (mddev->persistent)
3234 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3235 else
3236 rdev->sb_offset =
3237 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3238
3239 size = calc_dev_size(rdev, mddev->chunk_size);
3240 rdev->size = size;
3241
b2d444d7 3242 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 3243 printk(KERN_WARNING
3244 "md: can not hot-add faulty %s disk to %s!\n",
3245 bdevname(rdev->bdev,b), mdname(mddev));
3246 err = -EINVAL;
3247 goto abort_export;
3248 }
b2d444d7 3249 clear_bit(In_sync, &rdev->flags);
1da177e4 3250 rdev->desc_nr = -1;
2bf071bf
N		 3251 err = bind_rdev_to_array(rdev, mddev);
3252 if (err)
3253 goto abort_export;
1da177e4
LT		 3254
3255 /*
3256 * The rest should better be atomic, we can have disk failures
3257 * noticed in interrupt contexts ...
3258 */
3259
3260 if (rdev->desc_nr == mddev->max_disks) {
3261 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
3262 mdname(mddev));
3263 err = -EBUSY;
3264 goto abort_unbind_export;
3265 }
3266
3267 rdev->raid_disk = -1;
3268
3269 md_update_sb(mddev);
3270
3271 /*
3272 * Kick recovery, maybe this spare has to be added to the
3273 * array immediately.
3274 */
3275 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3276 md_wakeup_thread(mddev->thread);
d7603b7e 3277 md_new_event(mddev);
1da177e4
LT		 3278 return 0;
3279
3280abort_unbind_export:
3281 unbind_rdev_from_array(rdev);
3282
3283abort_export:
3284 export_rdev(rdev);
3285 return err;
3286}
3287
32a7627c
N		 3288/* similar to deny_write_access, but accounts for our holding a reference
3289 * to the file ourselves */
3290static int deny_bitmap_write_access(struct file * file)
3291{
3292 struct inode *inode = file->f_mapping->host;
3293
3294 spin_lock(&inode->i_lock);
3295 if (atomic_read(&inode->i_writecount) > 1) {
3296 spin_unlock(&inode->i_lock);
3297 return -ETXTBSY;
3298 }
3299 atomic_set(&inode->i_writecount, -1);
3300 spin_unlock(&inode->i_lock);
3301
3302 return 0;
3303}
3304
3305static int set_bitmap_file(mddev_t *mddev, int fd)
3306{
3307 int err;
3308
36fa3063
N		 3309 if (mddev->pers) {
3310 if (!mddev->pers->quiesce)
3311 return -EBUSY;
3312 if (mddev->recovery || mddev->sync_thread)
3313 return -EBUSY;
3314 /* we should be able to change the bitmap.. */
3315 }
32a7627c 3316
32a7627c 3317
36fa3063
N		 3318 if (fd >= 0) {
3319 if (mddev->bitmap)
3320 return -EEXIST; /* cannot add when bitmap is present */
3321 mddev->bitmap_file = fget(fd);
32a7627c 3322
36fa3063
N		 3323 if (mddev->bitmap_file == NULL) {
3324 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
3325 mdname(mddev));
3326 return -EBADF;
3327 }
3328
3329 err = deny_bitmap_write_access(mddev->bitmap_file);
3330 if (err) {
3331 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
3332 mdname(mddev));
3333 fput(mddev->bitmap_file);
3334 mddev->bitmap_file = NULL;
3335 return err;
3336 }
a654b9d8 3337 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 3338 } else if (mddev->bitmap == NULL)
3339 return -ENOENT; /* cannot remove what isn't there */
3340 err = 0;
3341 if (mddev->pers) {
3342 mddev->pers->quiesce(mddev, 1);
3343 if (fd >= 0)
3344 err = bitmap_create(mddev);
3345 if (fd < 0 || err)
3346 bitmap_destroy(mddev);
3347 mddev->pers->quiesce(mddev, 0);
3348 } else if (fd < 0) {
3349 if (mddev->bitmap_file)
3350 fput(mddev->bitmap_file);
3351 mddev->bitmap_file = NULL;
3352 }
3353
32a7627c
N		 3354 return err;
3355}
3356
1da177e4
LT		 3357/*
3358 * set_array_info is used two different ways
3359 * The original usage is when creating a new array.
3360 * In this usage, raid_disks is > 0 and it together with
3361 * level, size, not_persistent,layout,chunksize determine the
3362 * shape of the array.
3363 * This will always create an array with a type-0.90.0 superblock.
3364 * The newer usage is when assembling an array.
3365 * In this case raid_disks will be 0, and the major_version field is
3366 * use to determine which style super-blocks are to be found on the devices.
3367 * The minor and patch _version numbers are also kept incase the
3368 * super_block handler wishes to interpret them.
3369 */
3370static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
3371{
3372
3373 if (info->raid_disks == 0) {
3374 /* just setting version number for superblock loading */
3375 if (info->major_version < 0 ||
3376 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
3377 super_types[info->major_version].name == NULL) {
3378 /* maybe try to auto-load a module? */
3379 printk(KERN_INFO
3380 "md: superblock version %d not known\n",
3381 info->major_version);
3382 return -EINVAL;
3383 }
3384 mddev->major_version = info->major_version;
3385 mddev->minor_version = info->minor_version;
3386 mddev->patch_version = info->patch_version;
3387 return 0;
3388 }
3389 mddev->major_version = MD_MAJOR_VERSION;
3390 mddev->minor_version = MD_MINOR_VERSION;
3391 mddev->patch_version = MD_PATCHLEVEL_VERSION;
3392 mddev->ctime = get_seconds();
3393
3394 mddev->level = info->level;
3395 mddev->size = info->size;
3396 mddev->raid_disks = info->raid_disks;
3397 /* don't set md_minor, it is determined by which /dev/md* was
3398 * openned
3399 */
3400 if (info->state & (1<<MD_SB_CLEAN))
3401 mddev->recovery_cp = MaxSector;
3402 else
3403 mddev->recovery_cp = 0;
3404 mddev->persistent = ! info->not_persistent;
3405
3406 mddev->layout = info->layout;
3407 mddev->chunk_size = info->chunk_size;
3408
3409 mddev->max_disks = MD_SB_DISKS;
3410
3411 mddev->sb_dirty = 1;
3412
b2a2703c
N		 3413 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
3414 mddev->bitmap_offset = 0;
3415
1da177e4
LT		 3416 /*
3417 * Generate a 128 bit UUID
3418 */
3419 get_random_bytes(mddev->uuid, 16);
3420
3421 return 0;
3422}
3423
a35b0d69
N		 3424static int update_size(mddev_t *mddev, unsigned long size)
3425{
3426 mdk_rdev_t * rdev;
3427 int rv;
3428 struct list_head *tmp;
3429
3430 if (mddev->pers->resize == NULL)
3431 return -EINVAL;
3432 /* The "size" is the amount of each device that is used.
3433 * This can only make sense for arrays with redundancy.
3434 * linear and raid0 always use whatever space is available
3435 * We can only consider changing the size if no resync
3436 * or reconstruction is happening, and if the new size
3437 * is acceptable. It must fit before the sb_offset or,
3438 * if that is <data_offset, it must fit before the
3439 * size of each device.
3440 * If size is zero, we find the largest size that fits.
3441 */
3442 if (mddev->sync_thread)
3443 return -EBUSY;
3444 ITERATE_RDEV(mddev,rdev,tmp) {
3445 sector_t avail;
3446 int fit = (size == 0);
3447 if (rdev->sb_offset > rdev->data_offset)
3448 avail = (rdev->sb_offset*2) - rdev->data_offset;
3449 else
3450 avail = get_capacity(rdev->bdev->bd_disk)
3451 - rdev->data_offset;
3452 if (fit && (size == 0 || size > avail/2))
3453 size = avail/2;
3454 if (avail < ((sector_t)size << 1))
3455 return -ENOSPC;
3456 }
3457 rv = mddev->pers->resize(mddev, (sector_t)size *2);
3458 if (!rv) {
3459 struct block_device *bdev;
3460
3461 bdev = bdget_disk(mddev->gendisk, 0);
3462 if (bdev) {
1b1dcc1b 3463 mutex_lock(&bdev->bd_inode->i_mutex);
a35b0d69 3464 i_size_write(bdev->bd_inode, mddev->array_size << 10);
1b1dcc1b 3465 mutex_unlock(&bdev->bd_inode->i_mutex);
a35b0d69
N		 3466 bdput(bdev);
3467 }
3468 }
3469 return rv;
3470}
3471
da943b99
N		 3472static int update_raid_disks(mddev_t *mddev, int raid_disks)
3473{
3474 int rv;
3475 /* change the number of raid disks */
3476 if (mddev->pers->reshape == NULL)
3477 return -EINVAL;
3478 if (raid_disks <= 0 ||
3479 raid_disks >= mddev->max_disks)
3480 return -EINVAL;
3481 if (mddev->sync_thread)
3482 return -EBUSY;
3483 rv = mddev->pers->reshape(mddev, raid_disks);
3484 if (!rv) {
3485 struct block_device *bdev;
3486
3487 bdev = bdget_disk(mddev->gendisk, 0);
3488 if (bdev) {
1b1dcc1b 3489 mutex_lock(&bdev->bd_inode->i_mutex);
da943b99 3490 i_size_write(bdev->bd_inode, mddev->array_size << 10);
1b1dcc1b 3491 mutex_unlock(&bdev->bd_inode->i_mutex);
da943b99
N		 3492 bdput(bdev);
3493 }
3494 }
3495 return rv;
3496}
3497
3498
1da177e4
LT		 3499/*
3500 * update_array_info is used to change the configuration of an
3501 * on-line array.
3502 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
3503 * fields in the info are checked against the array.
3504 * Any differences that cannot be handled will cause an error.
3505 * Normally, only one change can be managed at a time.
3506 */
3507static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
3508{
3509 int rv = 0;
3510 int cnt = 0;
36fa3063
N		 3511 int state = 0;
3512
3513 /* calculate expected state,ignoring low bits */
3514 if (mddev->bitmap && mddev->bitmap_offset)
3515 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 3516
3517 if (mddev->major_version != info->major_version ||
3518 mddev->minor_version != info->minor_version ||
3519/* mddev->patch_version != info->patch_version || */
3520 mddev->ctime != info->ctime ||
3521 mddev->level != info->level ||
3522/* mddev->layout != info->layout || */
3523 !mddev->persistent != info->not_persistent||
36fa3063
N		 3524 mddev->chunk_size != info->chunk_size ||
3525 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
3526 ((state^info->state) & 0xfffffe00)
3527 )
1da177e4
LT		 3528 return -EINVAL;
3529 /* Check there is only one change */
3530 if (mddev->size != info->size) cnt++;
3531 if (mddev->raid_disks != info->raid_disks) cnt++;
3532 if (mddev->layout != info->layout) cnt++;
36fa3063 3533 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 3534 if (cnt == 0) return 0;
3535 if (cnt > 1) return -EINVAL;
3536
3537 if (mddev->layout != info->layout) {
3538 /* Change layout
3539 * we don't need to do anything at the md level, the
3540 * personality will take care of it all.
3541 */
3542 if (mddev->pers->reconfig == NULL)
3543 return -EINVAL;
3544 else
3545 return mddev->pers->reconfig(mddev, info->layout, -1);
3546 }
a35b0d69
N		 3547 if (mddev->size != info->size)
3548 rv = update_size(mddev, info->size);
3549
da943b99
N		 3550 if (mddev->raid_disks != info->raid_disks)
3551 rv = update_raid_disks(mddev, info->raid_disks);
3552
36fa3063
N		 3553 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
3554 if (mddev->pers->quiesce == NULL)
3555 return -EINVAL;
3556 if (mddev->recovery || mddev->sync_thread)
3557 return -EBUSY;
3558 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
3559 /* add the bitmap */
3560 if (mddev->bitmap)
3561 return -EEXIST;
3562 if (mddev->default_bitmap_offset == 0)
3563 return -EINVAL;
3564 mddev->bitmap_offset = mddev->default_bitmap_offset;
3565 mddev->pers->quiesce(mddev, 1);
3566 rv = bitmap_create(mddev);
3567 if (rv)
3568 bitmap_destroy(mddev);
3569 mddev->pers->quiesce(mddev, 0);
3570 } else {
3571 /* remove the bitmap */
3572 if (!mddev->bitmap)
3573 return -ENOENT;
3574 if (mddev->bitmap->file)
3575 return -EINVAL;
3576 mddev->pers->quiesce(mddev, 1);
3577 bitmap_destroy(mddev);
3578 mddev->pers->quiesce(mddev, 0);
3579 mddev->bitmap_offset = 0;
3580 }
3581 }
1da177e4
LT		 3582 md_update_sb(mddev);
3583 return rv;
3584}
3585
3586static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3587{
3588 mdk_rdev_t *rdev;
3589
3590 if (mddev->pers == NULL)
3591 return -ENODEV;
3592
3593 rdev = find_rdev(mddev, dev);
3594 if (!rdev)
3595 return -ENODEV;
3596
3597 md_error(mddev, rdev);
3598 return 0;
3599}
3600
a885c8c4
CH		 3601static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3602{
3603 mddev_t *mddev = bdev->bd_disk->private_data;
3604
3605 geo->heads = 2;
3606 geo->sectors = 4;
3607 geo->cylinders = get_capacity(mddev->gendisk) / 8;
3608 return 0;
3609}
3610
1da177e4
LT		 3611static int md_ioctl(struct inode *inode, struct file *file,
3612 unsigned int cmd, unsigned long arg)
3613{
3614 int err = 0;
3615 void __user *argp = (void __user *)arg;
1da177e4
LT		 3616 mddev_t *mddev = NULL;
3617
3618 if (!capable(CAP_SYS_ADMIN))
3619 return -EACCES;
3620
3621 /*
3622 * Commands dealing with the RAID driver but not any
3623 * particular array:
3624 */
3625 switch (cmd)
3626 {
3627 case RAID_VERSION:
3628 err = get_version(argp);
3629 goto done;
3630
3631 case PRINT_RAID_DEBUG:
3632 err = 0;
3633 md_print_devices();
3634 goto done;
3635
3636#ifndef MODULE
3637 case RAID_AUTORUN:
3638 err = 0;
3639 autostart_arrays(arg);
3640 goto done;
3641#endif
3642 default:;
3643 }
3644
3645 /*
3646 * Commands creating/starting a new array:
3647 */
3648
3649 mddev = inode->i_bdev->bd_disk->private_data;
3650
3651 if (!mddev) {
3652 BUG();
3653 goto abort;
3654 }
3655
3656
3657 if (cmd == START_ARRAY) {
3658 /* START_ARRAY doesn't need to lock the array as autostart_array
3659 * does the locking, and it could even be a different array
3660 */
3661 static int cnt = 3;
3662 if (cnt > 0 ) {
3663 printk(KERN_WARNING
3664 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
e8a00334 3665 "This will not be supported beyond July 2006\n",
1da177e4
LT		 3666 current->comm, current->pid);
3667 cnt--;
3668 }
3669 err = autostart_array(new_decode_dev(arg));
3670 if (err) {
3671 printk(KERN_WARNING "md: autostart failed!\n");
3672 goto abort;
3673 }
3674 goto done;
3675 }
3676
3677 err = mddev_lock(mddev);
3678 if (err) {
3679 printk(KERN_INFO
3680 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3681 err, cmd);
3682 goto abort;
3683 }
3684
3685 switch (cmd)
3686 {
3687 case SET_ARRAY_INFO:
3688 {
3689 mdu_array_info_t info;
3690 if (!arg)
3691 memset(&info, 0, sizeof(info));
3692 else if (copy_from_user(&info, argp, sizeof(info))) {
3693 err = -EFAULT;
3694 goto abort_unlock;
3695 }
3696 if (mddev->pers) {
3697 err = update_array_info(mddev, &info);
3698 if (err) {
3699 printk(KERN_WARNING "md: couldn't update"
3700 " array info. %d\n", err);
3701 goto abort_unlock;
3702 }
3703 goto done_unlock;
3704 }
3705 if (!list_empty(&mddev->disks)) {
3706 printk(KERN_WARNING
3707 "md: array %s already has disks!\n",
3708 mdname(mddev));
3709 err = -EBUSY;
3710 goto abort_unlock;
3711 }
3712 if (mddev->raid_disks) {
3713 printk(KERN_WARNING
3714 "md: array %s already initialised!\n",
3715 mdname(mddev));
3716 err = -EBUSY;
3717 goto abort_unlock;
3718 }
3719 err = set_array_info(mddev, &info);
3720 if (err) {
3721 printk(KERN_WARNING "md: couldn't set"
3722 " array info. %d\n", err);
3723 goto abort_unlock;
3724 }
3725 }
3726 goto done_unlock;
3727
3728 default:;
3729 }
3730
3731 /*
3732 * Commands querying/configuring an existing array:
3733 */
32a7627c
N		 3734 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3735 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3736 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3737 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
1da177e4
LT		 3738 err = -ENODEV;
3739 goto abort_unlock;
3740 }
3741
3742 /*
3743 * Commands even a read-only array can execute:
3744 */
3745 switch (cmd)
3746 {
3747 case GET_ARRAY_INFO:
3748 err = get_array_info(mddev, argp);
3749 goto done_unlock;
3750
32a7627c 3751 case GET_BITMAP_FILE:
87162a28 3752 err = get_bitmap_file(mddev, argp);
32a7627c
N		 3753 goto done_unlock;
3754
1da177e4
LT		 3755 case GET_DISK_INFO:
3756 err = get_disk_info(mddev, argp);
3757 goto done_unlock;
3758
3759 case RESTART_ARRAY_RW:
3760 err = restart_array(mddev);
3761 goto done_unlock;
3762
3763 case STOP_ARRAY:
3764 err = do_md_stop (mddev, 0);
3765 goto done_unlock;
3766
3767 case STOP_ARRAY_RO:
3768 err = do_md_stop (mddev, 1);
3769 goto done_unlock;
3770
3771 /*
3772 * We have a problem here : there is no easy way to give a CHS
3773 * virtual geometry. We currently pretend that we have a 2 heads
3774 * 4 sectors (with a BIG number of cylinders...). This drives
3775 * dosfs just mad... ;-)
3776 */
1da177e4
LT		 3777 }
3778
3779 /*
3780 * The remaining ioctls are changing the state of the
f91de92e
N		 3781 * superblock, so we do not allow them on read-only arrays.
3782 * However non-MD ioctls (e.g. get-size) will still come through
3783 * here and hit the 'default' below, so only disallow
3784 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 3785 */
f91de92e
N		 3786 if (_IOC_TYPE(cmd) == MD_MAJOR &&
3787 mddev->ro && mddev->pers) {
3788 if (mddev->ro == 2) {
3789 mddev->ro = 0;
3790 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3791 md_wakeup_thread(mddev->thread);
3792
3793 } else {
3794 err = -EROFS;
3795 goto abort_unlock;
3796 }
1da177e4
LT		 3797 }
3798
3799 switch (cmd)
3800 {
3801 case ADD_NEW_DISK:
3802 {
3803 mdu_disk_info_t info;
3804 if (copy_from_user(&info, argp, sizeof(info)))
3805 err = -EFAULT;
3806 else
3807 err = add_new_disk(mddev, &info);
3808 goto done_unlock;
3809 }
3810
3811 case HOT_REMOVE_DISK:
3812 err = hot_remove_disk(mddev, new_decode_dev(arg));
3813 goto done_unlock;
3814
3815 case HOT_ADD_DISK:
3816 err = hot_add_disk(mddev, new_decode_dev(arg));
3817 goto done_unlock;
3818
3819 case SET_DISK_FAULTY:
3820 err = set_disk_faulty(mddev, new_decode_dev(arg));
3821 goto done_unlock;
3822
3823 case RUN_ARRAY:
3824 err = do_md_run (mddev);
3825 goto done_unlock;
3826
32a7627c
N		 3827 case SET_BITMAP_FILE:
3828 err = set_bitmap_file(mddev, (int)arg);
3829 goto done_unlock;
3830
1da177e4
LT		 3831 default:
3832 if (_IOC_TYPE(cmd) == MD_MAJOR)
3833 printk(KERN_WARNING "md: %s(pid %d) used"
3834 " obsolete MD ioctl, upgrade your"
3835 " software to use new ictls.\n",
3836 current->comm, current->pid);
3837 err = -EINVAL;
3838 goto abort_unlock;
3839 }
3840
3841done_unlock:
3842abort_unlock:
3843 mddev_unlock(mddev);
3844
3845 return err;
3846done:
3847 if (err)
3848 MD_BUG();
3849abort:
3850 return err;
3851}
3852
3853static int md_open(struct inode *inode, struct file *file)
3854{
3855 /*
3856 * Succeed if we can lock the mddev, which confirms that
3857 * it isn't being stopped right now.
3858 */
3859 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3860 int err;
3861
3862 if ((err = mddev_lock(mddev)))
3863 goto out;
3864
3865 err = 0;
3866 mddev_get(mddev);
3867 mddev_unlock(mddev);
3868
3869 check_disk_change(inode->i_bdev);
3870 out:
3871 return err;
3872}
3873
3874static int md_release(struct inode *inode, struct file * file)
3875{
3876 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3877
3878 if (!mddev)
3879 BUG();
3880 mddev_put(mddev);
3881
3882 return 0;
3883}
3884
3885static int md_media_changed(struct gendisk *disk)
3886{
3887 mddev_t *mddev = disk->private_data;
3888
3889 return mddev->changed;
3890}
3891
3892static int md_revalidate(struct gendisk *disk)
3893{
3894 mddev_t *mddev = disk->private_data;
3895
3896 mddev->changed = 0;
3897 return 0;
3898}
3899static struct block_device_operations md_fops =
3900{
3901 .owner = THIS_MODULE,
3902 .open = md_open,
3903 .release = md_release,
3904 .ioctl = md_ioctl,
a885c8c4 3905 .getgeo = md_getgeo,
1da177e4
LT		 3906 .media_changed = md_media_changed,
3907 .revalidate_disk= md_revalidate,
3908};
3909
75c96f85 3910static int md_thread(void * arg)
1da177e4
LT		 3911{
3912 mdk_thread_t *thread = arg;
3913
1da177e4
LT		 3914 /*
3915 * md_thread is a 'system-thread', it's priority should be very
3916 * high. We avoid resource deadlocks individually in each
3917 * raid personality. (RAID5 does preallocation) We also use RR and
3918 * the very same RT priority as kswapd, thus we will never get
3919 * into a priority inversion deadlock.
3920 *
3921 * we definitely have to have equal or higher priority than
3922 * bdflush, otherwise bdflush will deadlock if there are too
3923 * many dirty RAID5 blocks.
3924 */
1da177e4 3925
6985c43f 3926 allow_signal(SIGKILL);
a6fb0934 3927 while (!kthread_should_stop()) {
1da177e4 3928
93588e22
N		 3929 /* We need to wait INTERRUPTIBLE so that
3930 * we don't add to the load-average.
3931 * That means we need to be sure no signals are
3932 * pending
3933 */
3934 if (signal_pending(current))
3935 flush_signals(current);
3936
3937 wait_event_interruptible_timeout
3938 (thread->wqueue,
3939 test_bit(THREAD_WAKEUP, &thread->flags)
3940 || kthread_should_stop(),
3941 thread->timeout);
3e1d1d28 3942 try_to_freeze();
1da177e4
LT		 3943
3944 clear_bit(THREAD_WAKEUP, &thread->flags);
3945
787453c2 3946 thread->run(thread->mddev);
1da177e4 3947 }
a6fb0934 3948
1da177e4
LT		 3949 return 0;
3950}
3951
3952void md_wakeup_thread(mdk_thread_t *thread)
3953{
3954 if (thread) {
3955 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
3956 set_bit(THREAD_WAKEUP, &thread->flags);
3957 wake_up(&thread->wqueue);
3958 }
3959}
3960
3961mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
3962 const char *name)
3963{
3964 mdk_thread_t *thread;
1da177e4 3965
9ffae0cf 3966 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 3967 if (!thread)
3968 return NULL;
3969
1da177e4
LT		 3970 init_waitqueue_head(&thread->wqueue);
3971
1da177e4
LT		 3972 thread->run = run;
3973 thread->mddev = mddev;
32a7627c 3974 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 3975 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 3976 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 3977 kfree(thread);
3978 return NULL;
3979 }
1da177e4
LT		 3980 return thread;
3981}
3982
1da177e4
LT		 3983void md_unregister_thread(mdk_thread_t *thread)
3984{
d28446fe 3985 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
a6fb0934
N		 3986
3987 kthread_stop(thread->tsk);
1da177e4
LT		 3988 kfree(thread);
3989}
3990
3991void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
3992{
3993 if (!mddev) {
3994 MD_BUG();
3995 return;
3996 }
3997
b2d444d7 3998 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 3999 return;
32a7627c 4000/*
1da177e4
LT		 4001 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4002 mdname(mddev),
4003 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4004 __builtin_return_address(0),__builtin_return_address(1),
4005 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 4006*/
1da177e4
LT		 4007 if (!mddev->pers->error_handler)
4008 return;
4009 mddev->pers->error_handler(mddev,rdev);
4010 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4011 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4012 md_wakeup_thread(mddev->thread);
d7603b7e 4013 md_new_event(mddev);
1da177e4
LT		 4014}
4015
4016/* seq_file implementation /proc/mdstat */
4017
4018static void status_unused(struct seq_file *seq)
4019{
4020 int i = 0;
4021 mdk_rdev_t *rdev;
4022 struct list_head *tmp;
4023
4024 seq_printf(seq, "unused devices: ");
4025
4026 ITERATE_RDEV_PENDING(rdev,tmp) {
4027 char b[BDEVNAME_SIZE];
4028 i++;
4029 seq_printf(seq, "%s ",
4030 bdevname(rdev->bdev,b));
4031 }
4032 if (!i)
4033 seq_printf(seq, "<none>");
4034
4035 seq_printf(seq, "\n");
4036}
4037
4038
4039static void status_resync(struct seq_file *seq, mddev_t * mddev)
4040{
4041 unsigned long max_blocks, resync, res, dt, db, rt;
4042
4043 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4044
4045 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4046 max_blocks = mddev->resync_max_sectors >> 1;
4047 else
4048 max_blocks = mddev->size;
4049
4050 /*
4051 * Should not happen.
4052 */
4053 if (!max_blocks) {
4054 MD_BUG();
4055 return;
4056 }
4057 res = (resync/1024)*1000/(max_blocks/1024 + 1);
4058 {
4059 int i, x = res/50, y = 20-x;
4060 seq_printf(seq, "[");
4061 for (i = 0; i < x; i++)
4062 seq_printf(seq, "=");
4063 seq_printf(seq, ">");
4064 for (i = 0; i < y; i++)
4065 seq_printf(seq, ".");
4066 seq_printf(seq, "] ");
4067 }
4068 seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)",
4069 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4070 "resync" : "recovery"),
4071 res/10, res % 10, resync, max_blocks);
4072
4073 /*
4074 * We do not want to overflow, so the order of operands and
4075 * the * 100 / 100 trick are important. We do a +1 to be
4076 * safe against division by zero. We only estimate anyway.
4077 *
4078 * dt: time from mark until now
4079 * db: blocks written from mark until now
4080 * rt: remaining time
4081 */
4082 dt = ((jiffies - mddev->resync_mark) / HZ);
4083 if (!dt) dt++;
4084 db = resync - (mddev->resync_mark_cnt/2);
4085 rt = (dt * ((max_blocks-resync) / (db/100+1)))/100;
4086
4087 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4088
4089 seq_printf(seq, " speed=%ldK/sec", db/dt);
4090}
4091
4092static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4093{
4094 struct list_head *tmp;
4095 loff_t l = *pos;
4096 mddev_t *mddev;
4097
4098 if (l >= 0x10000)
4099 return NULL;
4100 if (!l--)
4101 /* header */
4102 return (void*)1;
4103
4104 spin_lock(&all_mddevs_lock);
4105 list_for_each(tmp,&all_mddevs)
4106 if (!l--) {
4107 mddev = list_entry(tmp, mddev_t, all_mddevs);
4108 mddev_get(mddev);
4109 spin_unlock(&all_mddevs_lock);
4110 return mddev;
4111 }
4112 spin_unlock(&all_mddevs_lock);
4113 if (!l--)
4114 return (void*)2;/* tail */
4115 return NULL;
4116}
4117
4118static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4119{
4120 struct list_head *tmp;
4121 mddev_t *next_mddev, *mddev = v;
4122
4123 ++*pos;
4124 if (v == (void*)2)
4125 return NULL;
4126
4127 spin_lock(&all_mddevs_lock);
4128 if (v == (void*)1)
4129 tmp = all_mddevs.next;
4130 else
4131 tmp = mddev->all_mddevs.next;
4132 if (tmp != &all_mddevs)
4133 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4134 else {
4135 next_mddev = (void*)2;
4136 *pos = 0x10000;
4137 }
4138 spin_unlock(&all_mddevs_lock);
4139
4140 if (v != (void*)1)
4141 mddev_put(mddev);
4142 return next_mddev;
4143
4144}
4145
4146static void md_seq_stop(struct seq_file *seq, void *v)
4147{
4148 mddev_t *mddev = v;
4149
4150 if (mddev && v != (void*)1 && v != (void*)2)
4151 mddev_put(mddev);
4152}
4153
d7603b7e
N		 4154struct mdstat_info {
4155 int event;
4156};
4157
1da177e4
LT		 4158static int md_seq_show(struct seq_file *seq, void *v)
4159{
4160 mddev_t *mddev = v;
4161 sector_t size;
4162 struct list_head *tmp2;
4163 mdk_rdev_t *rdev;
d7603b7e 4164 struct mdstat_info *mi = seq->private;
32a7627c 4165 struct bitmap *bitmap;
1da177e4
LT		 4166
4167 if (v == (void*)1) {
2604b703 4168 struct mdk_personality *pers;
1da177e4
LT		 4169 seq_printf(seq, "Personalities : ");
4170 spin_lock(&pers_lock);
2604b703
N		 4171 list_for_each_entry(pers, &pers_list, list)
4172 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT		 4173
4174 spin_unlock(&pers_lock);
4175 seq_printf(seq, "\n");
d7603b7e 4176 mi->event = atomic_read(&md_event_count);
1da177e4
LT		 4177 return 0;
4178 }
4179 if (v == (void*)2) {
4180 status_unused(seq);
4181 return 0;
4182 }
4183
4184 if (mddev_lock(mddev)!=0)
4185 return -EINTR;
4186 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4187 seq_printf(seq, "%s : %sactive", mdname(mddev),
4188 mddev->pers ? "" : "in");
4189 if (mddev->pers) {
f91de92e 4190 if (mddev->ro==1)
1da177e4 4191 seq_printf(seq, " (read-only)");
f91de92e
N		 4192 if (mddev->ro==2)
4193 seq_printf(seq, "(auto-read-only)");
1da177e4
LT		 4194 seq_printf(seq, " %s", mddev->pers->name);
4195 }
4196
4197 size = 0;
4198 ITERATE_RDEV(mddev,rdev,tmp2) {
4199 char b[BDEVNAME_SIZE];
4200 seq_printf(seq, " %s[%d]",
4201 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 4202 if (test_bit(WriteMostly, &rdev->flags))
4203 seq_printf(seq, "(W)");
b2d444d7 4204 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4205 seq_printf(seq, "(F)");
4206 continue;
b325a32e
N		 4207 } else if (rdev->raid_disk < 0)
4208 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 4209 size += rdev->size;
4210 }
4211
4212 if (!list_empty(&mddev->disks)) {
4213 if (mddev->pers)
4214 seq_printf(seq, "\n %llu blocks",
4215 (unsigned long long)mddev->array_size);
4216 else
4217 seq_printf(seq, "\n %llu blocks",
4218 (unsigned long long)size);
4219 }
1cd6bf19
N		 4220 if (mddev->persistent) {
4221 if (mddev->major_version != 0 ||
4222 mddev->minor_version != 90) {
4223 seq_printf(seq," super %d.%d",
4224 mddev->major_version,
4225 mddev->minor_version);
4226 }
4227 } else
4228 seq_printf(seq, " super non-persistent");
1da177e4
LT		 4229
4230 if (mddev->pers) {
4231 mddev->pers->status (seq, mddev);
4232 seq_printf(seq, "\n ");
8e1b39d6
N		 4233 if (mddev->pers->sync_request) {
4234 if (mddev->curr_resync > 2) {
4235 status_resync (seq, mddev);
4236 seq_printf(seq, "\n ");
4237 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4238 seq_printf(seq, "\tresync=DELAYED\n ");
4239 else if (mddev->recovery_cp < MaxSector)
4240 seq_printf(seq, "\tresync=PENDING\n ");
4241 }
32a7627c
N		 4242 } else
4243 seq_printf(seq, "\n ");
4244
4245 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 4246 unsigned long chunk_kb;
4247 unsigned long flags;
32a7627c
N		 4248 spin_lock_irqsave(&bitmap->lock, flags);
4249 chunk_kb = bitmap->chunksize >> 10;
4250 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
4251 "%lu%s chunk",
4252 bitmap->pages - bitmap->missing_pages,
4253 bitmap->pages,
4254 (bitmap->pages - bitmap->missing_pages)
4255 << (PAGE_SHIFT - 10),
4256 chunk_kb ? chunk_kb : bitmap->chunksize,
4257 chunk_kb ? "KB" : "B");
78d742d8
N		 4258 if (bitmap->file) {
4259 seq_printf(seq, ", file: ");
4260 seq_path(seq, bitmap->file->f_vfsmnt,
4261 bitmap->file->f_dentry," \t\n");
32a7627c 4262 }
78d742d8 4263
32a7627c
N		 4264 seq_printf(seq, "\n");
4265 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 4266 }
4267
4268 seq_printf(seq, "\n");
4269 }
4270 mddev_unlock(mddev);
4271
4272 return 0;
4273}
4274
4275static struct seq_operations md_seq_ops = {
4276 .start = md_seq_start,
4277 .next = md_seq_next,
4278 .stop = md_seq_stop,
4279 .show = md_seq_show,
4280};
4281
4282static int md_seq_open(struct inode *inode, struct file *file)
4283{
4284 int error;
d7603b7e
N		 4285 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
4286 if (mi == NULL)
4287 return -ENOMEM;
1da177e4
LT		 4288
4289 error = seq_open(file, &md_seq_ops);
d7603b7e
N		 4290 if (error)
4291 kfree(mi);
4292 else {
4293 struct seq_file *p = file->private_data;
4294 p->private = mi;
4295 mi->event = atomic_read(&md_event_count);
4296 }
1da177e4
LT		 4297 return error;
4298}
4299
d7603b7e
N		 4300static int md_seq_release(struct inode *inode, struct file *file)
4301{
4302 struct seq_file *m = file->private_data;
4303 struct mdstat_info *mi = m->private;
4304 m->private = NULL;
4305 kfree(mi);
4306 return seq_release(inode, file);
4307}
4308
4309static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
4310{
4311 struct seq_file *m = filp->private_data;
4312 struct mdstat_info *mi = m->private;
4313 int mask;
4314
4315 poll_wait(filp, &md_event_waiters, wait);
4316
4317 /* always allow read */
4318 mask = POLLIN | POLLRDNORM;
4319
4320 if (mi->event != atomic_read(&md_event_count))
4321 mask |= POLLERR | POLLPRI;
4322 return mask;
4323}
4324
1da177e4
LT		 4325static struct file_operations md_seq_fops = {
4326 .open = md_seq_open,
4327 .read = seq_read,
4328 .llseek = seq_lseek,
d7603b7e
N		 4329 .release = md_seq_release,
4330 .poll = mdstat_poll,
1da177e4
LT		 4331};
4332
2604b703 4333int register_md_personality(struct mdk_personality *p)
1da177e4 4334{
1da177e4 4335 spin_lock(&pers_lock);
2604b703
N		 4336 list_add_tail(&p->list, &pers_list);
4337 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
1da177e4
LT		 4338 spin_unlock(&pers_lock);
4339 return 0;
4340}
4341
2604b703 4342int unregister_md_personality(struct mdk_personality *p)
1da177e4 4343{
2604b703 4344 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 4345 spin_lock(&pers_lock);
2604b703 4346 list_del_init(&p->list);
1da177e4
LT		 4347 spin_unlock(&pers_lock);
4348 return 0;
4349}
4350
4351static int is_mddev_idle(mddev_t *mddev)
4352{
4353 mdk_rdev_t * rdev;
4354 struct list_head *tmp;
4355 int idle;
4356 unsigned long curr_events;
4357
4358 idle = 1;
4359 ITERATE_RDEV(mddev,rdev,tmp) {
4360 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 4361 curr_events = disk_stat_read(disk, sectors[0]) +
4362 disk_stat_read(disk, sectors[1]) -
1da177e4 4363 atomic_read(&disk->sync_io);
c0e48521
N		 4364 /* The difference between curr_events and last_events
4365 * will be affected by any new non-sync IO (making
4366 * curr_events bigger) and any difference in the amount of
4367 * in-flight syncio (making current_events bigger or smaller)
4368 * The amount in-flight is currently limited to
4369 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4370 * which is at most 4096 sectors.
4371 * These numbers are fairly fragile and should be made
4372 * more robust, probably by enforcing the
4373 * 'window size' that md_do_sync sort-of uses.
4374 *
1da177e4
LT		 4375 * Note: the following is an unsigned comparison.
4376 */
c0e48521 4377 if ((curr_events - rdev->last_events + 4096) > 8192) {
1da177e4
LT		 4378 rdev->last_events = curr_events;
4379 idle = 0;
4380 }
4381 }
4382 return idle;
4383}
4384
4385void md_done_sync(mddev_t *mddev, int blocks, int ok)
4386{
4387 /* another "blocks" (512byte) blocks have been synced */
4388 atomic_sub(blocks, &mddev->recovery_active);
4389 wake_up(&mddev->recovery_wait);
4390 if (!ok) {
4391 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4392 md_wakeup_thread(mddev->thread);
4393 // stop recovery, signal do_sync ....
4394 }
4395}
4396
4397
06d91a5f
N		 4398/* md_write_start(mddev, bi)
4399 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 4400 * in superblock) before writing, schedule a superblock update
4401 * and wait for it to complete.
06d91a5f 4402 */
3d310eb7 4403void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 4404{
06d91a5f 4405 if (bio_data_dir(bi) != WRITE)
3d310eb7 4406 return;
06d91a5f 4407
f91de92e
N		 4408 BUG_ON(mddev->ro == 1);
4409 if (mddev->ro == 2) {
4410 /* need to switch to read/write */
4411 mddev->ro = 0;
4412 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4413 md_wakeup_thread(mddev->thread);
4414 }
06d91a5f 4415 atomic_inc(&mddev->writes_pending);
06d91a5f 4416 if (mddev->in_sync) {
a9701a30 4417 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 4418 if (mddev->in_sync) {
4419 mddev->in_sync = 0;
4420 mddev->sb_dirty = 1;
4421 md_wakeup_thread(mddev->thread);
4422 }
a9701a30 4423 spin_unlock_irq(&mddev->write_lock);
06d91a5f 4424 }
3d310eb7 4425 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
1da177e4
LT		 4426}
4427
4428void md_write_end(mddev_t *mddev)
4429{
4430 if (atomic_dec_and_test(&mddev->writes_pending)) {
4431 if (mddev->safemode == 2)
4432 md_wakeup_thread(mddev->thread);
4433 else
4434 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
4435 }
4436}
4437
75c96f85 4438static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
1da177e4
LT		 4439
4440#define SYNC_MARKS 10
4441#define SYNC_MARK_STEP (3*HZ)
4442static void md_do_sync(mddev_t *mddev)
4443{
4444 mddev_t *mddev2;
4445 unsigned int currspeed = 0,
4446 window;
57afd89f 4447 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 4448 unsigned long mark[SYNC_MARKS];
4449 sector_t mark_cnt[SYNC_MARKS];
4450 int last_mark,m;
4451 struct list_head *tmp;
4452 sector_t last_check;
57afd89f 4453 int skipped = 0;
1da177e4
LT		 4454
4455 /* just incase thread restarts... */
4456 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
4457 return;
4458
4459 /* we overload curr_resync somewhat here.
4460 * 0 == not engaged in resync at all
4461 * 2 == checking that there is no conflict with another sync
4462 * 1 == like 2, but have yielded to allow conflicting resync to
4463 * commense
4464 * other == active in resync - this many blocks
4465 *
4466 * Before starting a resync we must have set curr_resync to
4467 * 2, and then checked that every "conflicting" array has curr_resync
4468 * less than ours. When we find one that is the same or higher
4469 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
4470 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
4471 * This will mean we have to start checking from the beginning again.
4472 *
4473 */
4474
4475 do {
4476 mddev->curr_resync = 2;
4477
4478 try_again:
787453c2 4479 if (kthread_should_stop()) {
6985c43f 4480 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 4481 goto skip;
4482 }
4483 ITERATE_MDDEV(mddev2,tmp) {
1da177e4
LT		 4484 if (mddev2 == mddev)
4485 continue;
4486 if (mddev2->curr_resync &&
4487 match_mddev_units(mddev,mddev2)) {
4488 DEFINE_WAIT(wq);
4489 if (mddev < mddev2 && mddev->curr_resync == 2) {
4490 /* arbitrarily yield */
4491 mddev->curr_resync = 1;
4492 wake_up(&resync_wait);
4493 }
4494 if (mddev > mddev2 && mddev->curr_resync == 1)
4495 /* no need to wait here, we can wait the next
4496 * time 'round when curr_resync == 2
4497 */
4498 continue;
787453c2
N		 4499 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
4500 if (!kthread_should_stop() &&
8712e553 4501 mddev2->curr_resync >= mddev->curr_resync) {
1da177e4
LT		 4502 printk(KERN_INFO "md: delaying resync of %s"
4503 " until %s has finished resync (they"
4504 " share one or more physical units)\n",
4505 mdname(mddev), mdname(mddev2));
4506 mddev_put(mddev2);
4507 schedule();
4508 finish_wait(&resync_wait, &wq);
4509 goto try_again;
4510 }
4511 finish_wait(&resync_wait, &wq);
4512 }
4513 }
4514 } while (mddev->curr_resync < 2);
4515
9d88883e 4516 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 4517 /* resync follows the size requested by the personality,
57afd89f 4518 * which defaults to physical size, but can be virtual size
1da177e4
LT		 4519 */
4520 max_sectors = mddev->resync_max_sectors;
9d88883e
N		 4521 mddev->resync_mismatches = 0;
4522 } else
1da177e4
LT		 4523 /* recovery follows the physical size of devices */
4524 max_sectors = mddev->size << 1;
4525
4526 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
4527 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
88202a0c 4528 " %d KB/sec/disc.\n", speed_min(mddev));
338cec32 4529 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
1da177e4 4530 "(but not more than %d KB/sec) for reconstruction.\n",
88202a0c 4531 speed_max(mddev));
1da177e4
LT		 4532
4533 is_mddev_idle(mddev); /* this also initializes IO event counters */
32a7627c 4534 /* we don't use the checkpoint if there's a bitmap */
24dd469d
N		 4535 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap
4536 && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
1da177e4
LT		 4537 j = mddev->recovery_cp;
4538 else
4539 j = 0;
57afd89f 4540 io_sectors = 0;
1da177e4
LT		 4541 for (m = 0; m < SYNC_MARKS; m++) {
4542 mark[m] = jiffies;
57afd89f 4543 mark_cnt[m] = io_sectors;
1da177e4
LT		 4544 }
4545 last_mark = 0;
4546 mddev->resync_mark = mark[last_mark];
4547 mddev->resync_mark_cnt = mark_cnt[last_mark];
4548
4549 /*
4550 * Tune reconstruction:
4551 */
4552 window = 32*(PAGE_SIZE/512);
4553 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
4554 window/2,(unsigned long long) max_sectors/2);
4555
4556 atomic_set(&mddev->recovery_active, 0);
4557 init_waitqueue_head(&mddev->recovery_wait);
4558 last_check = 0;
4559
4560 if (j>2) {
4561 printk(KERN_INFO
4562 "md: resuming recovery of %s from checkpoint.\n",
4563 mdname(mddev));
4564 mddev->curr_resync = j;
4565 }
4566
4567 while (j < max_sectors) {
57afd89f 4568 sector_t sectors;
1da177e4 4569
57afd89f
N		 4570 skipped = 0;
4571 sectors = mddev->pers->sync_request(mddev, j, &skipped,
88202a0c 4572 currspeed < speed_min(mddev));
57afd89f 4573 if (sectors == 0) {
1da177e4
LT		 4574 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4575 goto out;
4576 }
57afd89f
N		 4577
4578 if (!skipped) { /* actual IO requested */
4579 io_sectors += sectors;
4580 atomic_add(sectors, &mddev->recovery_active);
4581 }
4582
1da177e4
LT		 4583 j += sectors;
4584 if (j>1) mddev->curr_resync = j;
d7603b7e
N		 4585 if (last_check == 0)
4586 /* this is the earliers that rebuilt will be
4587 * visible in /proc/mdstat
4588 */
4589 md_new_event(mddev);
57afd89f
N		 4590
4591 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 4592 continue;
4593
57afd89f 4594 last_check = io_sectors;
1da177e4
LT		 4595
4596 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
4597 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
4598 break;
4599
4600 repeat:
4601 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
4602 /* step marks */
4603 int next = (last_mark+1) % SYNC_MARKS;
4604
4605 mddev->resync_mark = mark[next];
4606 mddev->resync_mark_cnt = mark_cnt[next];
4607 mark[next] = jiffies;
57afd89f 4608 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 4609 last_mark = next;
4610 }
4611
4612
787453c2 4613 if (kthread_should_stop()) {
1da177e4
LT		 4614 /*
4615 * got a signal, exit.
4616 */
4617 printk(KERN_INFO
4618 "md: md_do_sync() got signal ... exiting\n");
1da177e4
LT		 4619 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4620 goto out;
4621 }
4622
4623 /*
4624 * this loop exits only if either when we are slower than
4625 * the 'hard' speed limit, or the system was IO-idle for
4626 * a jiffy.
4627 * the system might be non-idle CPU-wise, but we only care
4628 * about not overloading the IO subsystem. (things like an
4629 * e2fsck being done on the RAID array should execute fast)
4630 */
4631 mddev->queue->unplug_fn(mddev->queue);
4632 cond_resched();
4633
57afd89f
N		 4634 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
4635 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4 4636
88202a0c
N		 4637 if (currspeed > speed_min(mddev)) {
4638 if ((currspeed > speed_max(mddev)) ||
1da177e4 4639 !is_mddev_idle(mddev)) {
c0e48521 4640 msleep(500);
1da177e4
LT		 4641 goto repeat;
4642 }
4643 }
4644 }
4645 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
4646 /*
4647 * this also signals 'finished resyncing' to md_stop
4648 */
4649 out:
4650 mddev->queue->unplug_fn(mddev->queue);
4651
4652 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
4653
4654 /* tell personality that we are finished */
57afd89f 4655 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 4656
4657 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4658 mddev->curr_resync > 2 &&
4659 mddev->curr_resync >= mddev->recovery_cp) {
4660 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4661 printk(KERN_INFO
4662 "md: checkpointing recovery of %s.\n",
4663 mdname(mddev));
4664 mddev->recovery_cp = mddev->curr_resync;
4665 } else
4666 mddev->recovery_cp = MaxSector;
4667 }
4668
1da177e4
LT		 4669 skip:
4670 mddev->curr_resync = 0;
4671 wake_up(&resync_wait);
4672 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
4673 md_wakeup_thread(mddev->thread);
4674}
4675
4676
4677/*
4678 * This routine is regularly called by all per-raid-array threads to
4679 * deal with generic issues like resync and super-block update.
4680 * Raid personalities that don't have a thread (linear/raid0) do not
4681 * need this as they never do any recovery or update the superblock.
4682 *
4683 * It does not do any resync itself, but rather "forks" off other threads
4684 * to do that as needed.
4685 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4686 * "->recovery" and create a thread at ->sync_thread.
4687 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4688 * and wakeups up this thread which will reap the thread and finish up.
4689 * This thread also removes any faulty devices (with nr_pending == 0).
4690 *
4691 * The overall approach is:
4692 * 1/ if the superblock needs updating, update it.
4693 * 2/ If a recovery thread is running, don't do anything else.
4694 * 3/ If recovery has finished, clean up, possibly marking spares active.
4695 * 4/ If there are any faulty devices, remove them.
4696 * 5/ If array is degraded, try to add spares devices
4697 * 6/ If array has spares or is not in-sync, start a resync thread.
4698 */
4699void md_check_recovery(mddev_t *mddev)
4700{
4701 mdk_rdev_t *rdev;
4702 struct list_head *rtmp;
4703
4704
5f40402d
N		 4705 if (mddev->bitmap)
4706 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 4707
4708 if (mddev->ro)
4709 return;
fca4d848
N		 4710
4711 if (signal_pending(current)) {
4712 if (mddev->pers->sync_request) {
4713 printk(KERN_INFO "md: %s in immediate safe mode\n",
4714 mdname(mddev));
4715 mddev->safemode = 2;
4716 }
4717 flush_signals(current);
4718 }
4719
1da177e4
LT		 4720 if ( ! (
4721 mddev->sb_dirty ||
4722 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848
N		 4723 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
4724 (mddev->safemode == 1) ||
4725 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
4726 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 4727 ))
4728 return;
fca4d848 4729
1da177e4
LT		 4730 if (mddev_trylock(mddev)==0) {
4731 int spares =0;
fca4d848 4732
a9701a30 4733 spin_lock_irq(&mddev->write_lock);
fca4d848
N		 4734 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
4735 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
4736 mddev->in_sync = 1;
4737 mddev->sb_dirty = 1;
4738 }
4739 if (mddev->safemode == 1)
4740 mddev->safemode = 0;
a9701a30 4741 spin_unlock_irq(&mddev->write_lock);
fca4d848 4742
1da177e4
LT		 4743 if (mddev->sb_dirty)
4744 md_update_sb(mddev);
06d91a5f 4745
06d91a5f 4746
1da177e4
LT		 4747 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4748 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
4749 /* resync/recovery still happening */
4750 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4751 goto unlock;
4752 }
4753 if (mddev->sync_thread) {
4754 /* resync has finished, collect result */
4755 md_unregister_thread(mddev->sync_thread);
4756 mddev->sync_thread = NULL;
4757 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4758 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4759 /* success...*/
4760 /* activate any spares */
4761 mddev->pers->spare_active(mddev);
4762 }
4763 md_update_sb(mddev);
41158c7e
N		 4764
4765 /* if array is no-longer degraded, then any saved_raid_disk
4766 * information must be scrapped
4767 */
4768 if (!mddev->degraded)
4769 ITERATE_RDEV(mddev,rdev,rtmp)
4770 rdev->saved_raid_disk = -1;
4771
1da177e4
LT		 4772 mddev->recovery = 0;
4773 /* flag recovery needed just to double check */
4774 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
d7603b7e 4775 md_new_event(mddev);
1da177e4
LT		 4776 goto unlock;
4777 }
24dd469d
N		 4778 /* Clear some bits that don't mean anything, but
4779 * might be left set
4780 */
4781 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4782 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
4783 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
4784 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4
LT		 4785
4786 /* no recovery is running.
4787 * remove any failed drives, then
4788 * add spares if possible.
4789 * Spare are also removed and re-added, to allow
4790 * the personality to fail the re-add.
4791 */
4792 ITERATE_RDEV(mddev,rdev,rtmp)
4793 if (rdev->raid_disk >= 0 &&
b2d444d7 4794 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
1da177e4 4795 atomic_read(&rdev->nr_pending)==0) {
86e6ffdd
N		 4796 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
4797 char nm[20];
4798 sprintf(nm,"rd%d", rdev->raid_disk);
4799 sysfs_remove_link(&mddev->kobj, nm);
1da177e4 4800 rdev->raid_disk = -1;
86e6ffdd 4801 }
1da177e4
LT		 4802 }
4803
4804 if (mddev->degraded) {
4805 ITERATE_RDEV(mddev,rdev,rtmp)
4806 if (rdev->raid_disk < 0
b2d444d7 4807 && !test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 4808 if (mddev->pers->hot_add_disk(mddev,rdev)) {
4809 char nm[20];
4810 sprintf(nm, "rd%d", rdev->raid_disk);
4811 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
1da177e4 4812 spares++;
d7603b7e 4813 md_new_event(mddev);
86e6ffdd 4814 } else
1da177e4
LT		 4815 break;
4816 }
4817 }
4818
24dd469d
N		 4819 if (spares) {
4820 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4821 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4822 } else if (mddev->recovery_cp < MaxSector) {
4823 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4824 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4825 /* nothing to be done ... */
1da177e4 4826 goto unlock;
24dd469d 4827
1da177e4
LT		 4828 if (mddev->pers->sync_request) {
4829 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 4830 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
4831 /* We are adding a device or devices to an array
4832 * which has the bitmap stored on all devices.
4833 * So make sure all bitmap pages get written
4834 */
4835 bitmap_write_all(mddev->bitmap);
4836 }
1da177e4
LT		 4837 mddev->sync_thread = md_register_thread(md_do_sync,
4838 mddev,
4839 "%s_resync");
4840 if (!mddev->sync_thread) {
4841 printk(KERN_ERR "%s: could not start resync"
4842 " thread...\n",
4843 mdname(mddev));
4844 /* leave the spares where they are, it shouldn't hurt */
4845 mddev->recovery = 0;
d7603b7e 4846 } else
1da177e4 4847 md_wakeup_thread(mddev->sync_thread);
d7603b7e 4848 md_new_event(mddev);
1da177e4
LT		 4849 }
4850 unlock:
4851 mddev_unlock(mddev);
4852 }
4853}
4854
75c96f85
AB		 4855static int md_notify_reboot(struct notifier_block *this,
4856 unsigned long code, void *x)
1da177e4
LT		 4857{
4858 struct list_head *tmp;
4859 mddev_t *mddev;
4860
4861 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
4862
4863 printk(KERN_INFO "md: stopping all md devices.\n");
4864
4865 ITERATE_MDDEV(mddev,tmp)
4866 if (mddev_trylock(mddev)==0)
4867 do_md_stop (mddev, 1);
4868 /*
4869 * certain more exotic SCSI devices are known to be
4870 * volatile wrt too early system reboots. While the
4871 * right place to handle this issue is the given
4872 * driver, we do want to have a safe RAID driver ...
4873 */
4874 mdelay(1000*1);
4875 }
4876 return NOTIFY_DONE;
4877}
4878
75c96f85 4879static struct notifier_block md_notifier = {
1da177e4
LT		 4880 .notifier_call = md_notify_reboot,
4881 .next = NULL,
4882 .priority = INT_MAX, /* before any real devices */
4883};
4884
4885static void md_geninit(void)
4886{
4887 struct proc_dir_entry *p;
4888
4889 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
4890
4891 p = create_proc_entry("mdstat", S_IRUGO, NULL);
4892 if (p)
4893 p->proc_fops = &md_seq_fops;
4894}
4895
75c96f85 4896static int __init md_init(void)
1da177e4
LT		 4897{
4898 int minor;
4899
4900 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4901 " MD_SB_DISKS=%d\n",
4902 MD_MAJOR_VERSION, MD_MINOR_VERSION,
4903 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
bd926c63 4904 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
32a7627c 4905 BITMAP_MINOR);
1da177e4
LT		 4906
4907 if (register_blkdev(MAJOR_NR, "md"))
4908 return -1;
4909 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
4910 unregister_blkdev(MAJOR_NR, "md");
4911 return -1;
4912 }
4913 devfs_mk_dir("md");
4914 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
4915 md_probe, NULL, NULL);
4916 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
4917 md_probe, NULL, NULL);
4918
4919 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4920 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
4921 S_IFBLK|S_IRUSR|S_IWUSR,
4922 "md/%d", minor);
4923
4924 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4925 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
4926 S_IFBLK|S_IRUSR|S_IWUSR,
4927 "md/mdp%d", minor);
4928
4929
4930 register_reboot_notifier(&md_notifier);
4931 raid_table_header = register_sysctl_table(raid_root_table, 1);
4932
4933 md_geninit();
4934 return (0);
4935}
4936
4937
4938#ifndef MODULE
4939
4940/*
4941 * Searches all registered partitions for autorun RAID arrays
4942 * at boot time.
4943 */
4944static dev_t detected_devices[128];
4945static int dev_cnt;
4946
4947void md_autodetect_dev(dev_t dev)
4948{
4949 if (dev_cnt >= 0 && dev_cnt < 127)
4950 detected_devices[dev_cnt++] = dev;
4951}
4952
4953
4954static void autostart_arrays(int part)
4955{
4956 mdk_rdev_t *rdev;
4957 int i;
4958
4959 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
4960
4961 for (i = 0; i < dev_cnt; i++) {
4962 dev_t dev = detected_devices[i];
4963
4964 rdev = md_import_device(dev,0, 0);
4965 if (IS_ERR(rdev))
4966 continue;
4967
b2d444d7 4968 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4969 MD_BUG();
4970 continue;
4971 }
4972 list_add(&rdev->same_set, &pending_raid_disks);
4973 }
4974 dev_cnt = 0;
4975
4976 autorun_devices(part);
4977}
4978
4979#endif
4980
4981static __exit void md_exit(void)
4982{
4983 mddev_t *mddev;
4984 struct list_head *tmp;
4985 int i;
4986 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
4987 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
4988 for (i=0; i < MAX_MD_DEVS; i++)
4989 devfs_remove("md/%d", i);
4990 for (i=0; i < MAX_MD_DEVS; i++)
4991 devfs_remove("md/d%d", i);
4992
4993 devfs_remove("md");
4994
4995 unregister_blkdev(MAJOR_NR,"md");
4996 unregister_blkdev(mdp_major, "mdp");
4997 unregister_reboot_notifier(&md_notifier);
4998 unregister_sysctl_table(raid_table_header);
4999 remove_proc_entry("mdstat", NULL);
5000 ITERATE_MDDEV(mddev,tmp) {
5001 struct gendisk *disk = mddev->gendisk;
5002 if (!disk)
5003 continue;
5004 export_array(mddev);
5005 del_gendisk(disk);
5006 put_disk(disk);
5007 mddev->gendisk = NULL;
5008 mddev_put(mddev);
5009 }
5010}
5011
5012module_init(md_init)
5013module_exit(md_exit)
5014
f91de92e
N		 5015static int get_ro(char *buffer, struct kernel_param *kp)
5016{
5017 return sprintf(buffer, "%d", start_readonly);
5018}
5019static int set_ro(const char *val, struct kernel_param *kp)
5020{
5021 char *e;
5022 int num = simple_strtoul(val, &e, 10);
5023 if (*val && (*e == '\0' || *e == '\n')) {
5024 start_readonly = num;
4dbcdc75 5025 return 0;
f91de92e
N		 5026 }
5027 return -EINVAL;
5028}
5029
5030module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
6ff8d8ec
N		 5031module_param(start_dirty_degraded, int, 0644);
5032
f91de92e 5033
1da177e4
LT		 5034EXPORT_SYMBOL(register_md_personality);
5035EXPORT_SYMBOL(unregister_md_personality);
5036EXPORT_SYMBOL(md_error);
5037EXPORT_SYMBOL(md_done_sync);
5038EXPORT_SYMBOL(md_write_start);
5039EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 5040EXPORT_SYMBOL(md_register_thread);
5041EXPORT_SYMBOL(md_unregister_thread);
5042EXPORT_SYMBOL(md_wakeup_thread);
5043EXPORT_SYMBOL(md_print_devices);
5044EXPORT_SYMBOL(md_check_recovery);
5045MODULE_LICENSE("GPL");
aa1595e9 5046MODULE_ALIAS("md");
72008652 5047MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
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