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[PATCH] dm/md dependency tree in sysfs: bd_claim_by_kobject
[net-next-2.6.git] / drivers / md / md.c
CommitLineData
1da177e4
LT		 1/*
2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
4
5 completely rewritten, based on the MD driver code from Marc Zyngier
6
7 Changes:
8
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
16
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
19
20 Neil Brown <neilb@cse.unsw.edu.au>.
21
32a7627c
N		 22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
24
1da177e4
LT		 25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
28 any later version.
29
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
33*/
34
35#include <linux/module.h>
36#include <linux/config.h>
a6fb0934 37#include <linux/kthread.h>
1da177e4
LT		 38#include <linux/linkage.h>
39#include <linux/raid/md.h>
32a7627c 40#include <linux/raid/bitmap.h>
1da177e4
LT		 41#include <linux/sysctl.h>
42#include <linux/devfs_fs_kernel.h>
43#include <linux/buffer_head.h> /* for invalidate_bdev */
44#include <linux/suspend.h>
d7603b7e 45#include <linux/poll.h>
1da177e4
LT		 46
47#include <linux/init.h>
48
32a7627c
N		 49#include <linux/file.h>
50
1da177e4
LT		 51#ifdef CONFIG_KMOD
52#include <linux/kmod.h>
53#endif
54
55#include <asm/unaligned.h>
56
57#define MAJOR_NR MD_MAJOR
58#define MD_DRIVER
59
60/* 63 partitions with the alternate major number (mdp) */
61#define MdpMinorShift 6
62
63#define DEBUG 0
64#define dprintk(x...) ((void)(DEBUG && printk(x)))
65
66
67#ifndef MODULE
68static void autostart_arrays (int part);
69#endif
70
2604b703 71static LIST_HEAD(pers_list);
1da177e4
LT		 72static DEFINE_SPINLOCK(pers_lock);
73
74/*
75 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
76 * is 1000 KB/sec, so the extra system load does not show up that much.
77 * Increase it if you want to have more _guaranteed_ speed. Note that
338cec32 78 * the RAID driver will use the maximum available bandwidth if the IO
1da177e4
LT		 79 * subsystem is idle. There is also an 'absolute maximum' reconstruction
80 * speed limit - in case reconstruction slows down your system despite
81 * idle IO detection.
82 *
83 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
88202a0c 84 * or /sys/block/mdX/md/sync_speed_{min,max}
1da177e4
LT		 85 */
86
87static int sysctl_speed_limit_min = 1000;
88static int sysctl_speed_limit_max = 200000;
88202a0c
N		 89static inline int speed_min(mddev_t *mddev)
90{
91 return mddev->sync_speed_min ?
92 mddev->sync_speed_min : sysctl_speed_limit_min;
93}
94
95static inline int speed_max(mddev_t *mddev)
96{
97 return mddev->sync_speed_max ?
98 mddev->sync_speed_max : sysctl_speed_limit_max;
99}
1da177e4
LT		 100
101static struct ctl_table_header *raid_table_header;
102
103static ctl_table raid_table[] = {
104 {
105 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
106 .procname = "speed_limit_min",
107 .data = &sysctl_speed_limit_min,
108 .maxlen = sizeof(int),
109 .mode = 0644,
110 .proc_handler = &proc_dointvec,
111 },
112 {
113 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
114 .procname = "speed_limit_max",
115 .data = &sysctl_speed_limit_max,
116 .maxlen = sizeof(int),
117 .mode = 0644,
118 .proc_handler = &proc_dointvec,
119 },
120 { .ctl_name = 0 }
121};
122
123static ctl_table raid_dir_table[] = {
124 {
125 .ctl_name = DEV_RAID,
126 .procname = "raid",
127 .maxlen = 0,
128 .mode = 0555,
129 .child = raid_table,
130 },
131 { .ctl_name = 0 }
132};
133
134static ctl_table raid_root_table[] = {
135 {
136 .ctl_name = CTL_DEV,
137 .procname = "dev",
138 .maxlen = 0,
139 .mode = 0555,
140 .child = raid_dir_table,
141 },
142 { .ctl_name = 0 }
143};
144
145static struct block_device_operations md_fops;
146
f91de92e
N		 147static int start_readonly;
148
d7603b7e
N		 149/*
150 * We have a system wide 'event count' that is incremented
151 * on any 'interesting' event, and readers of /proc/mdstat
152 * can use 'poll' or 'select' to find out when the event
153 * count increases.
154 *
155 * Events are:
156 * start array, stop array, error, add device, remove device,
157 * start build, activate spare
158 */
2989ddbd 159static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
d7603b7e 160static atomic_t md_event_count;
07dbd377 161static void md_new_event(mddev_t *mddev)
d7603b7e
N		 162{
163 atomic_inc(&md_event_count);
164 wake_up(&md_event_waiters);
165}
166
1da177e4
LT		 167/*
168 * Enables to iterate over all existing md arrays
169 * all_mddevs_lock protects this list.
170 */
171static LIST_HEAD(all_mddevs);
172static DEFINE_SPINLOCK(all_mddevs_lock);
173
174
175/*
176 * iterates through all used mddevs in the system.
177 * We take care to grab the all_mddevs_lock whenever navigating
178 * the list, and to always hold a refcount when unlocked.
179 * Any code which breaks out of this loop while own
180 * a reference to the current mddev and must mddev_put it.
181 */
182#define ITERATE_MDDEV(mddev,tmp) \
183 \
184 for (({ spin_lock(&all_mddevs_lock); \
185 tmp = all_mddevs.next; \
186 mddev = NULL;}); \
187 ({ if (tmp != &all_mddevs) \
188 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
189 spin_unlock(&all_mddevs_lock); \
190 if (mddev) mddev_put(mddev); \
191 mddev = list_entry(tmp, mddev_t, all_mddevs); \
192 tmp != &all_mddevs;}); \
193 ({ spin_lock(&all_mddevs_lock); \
194 tmp = tmp->next;}) \
195 )
196
197
198static int md_fail_request (request_queue_t *q, struct bio *bio)
199{
200 bio_io_error(bio, bio->bi_size);
201 return 0;
202}
203
204static inline mddev_t *mddev_get(mddev_t *mddev)
205{
206 atomic_inc(&mddev->active);
207 return mddev;
208}
209
210static void mddev_put(mddev_t *mddev)
211{
212 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
213 return;
214 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
215 list_del(&mddev->all_mddevs);
1312f40e
AV		 216 /* that blocks */
217 blk_cleanup_queue(mddev->queue);
218 /* that also blocks */
eae1701f 219 kobject_unregister(&mddev->kobj);
1312f40e 220 /* result blows... */
1da177e4
LT		 221 }
222 spin_unlock(&all_mddevs_lock);
223}
224
225static mddev_t * mddev_find(dev_t unit)
226{
227 mddev_t *mddev, *new = NULL;
228
229 retry:
230 spin_lock(&all_mddevs_lock);
231 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
232 if (mddev->unit == unit) {
233 mddev_get(mddev);
234 spin_unlock(&all_mddevs_lock);
990a8baf 235 kfree(new);
1da177e4
LT		 236 return mddev;
237 }
238
239 if (new) {
240 list_add(&new->all_mddevs, &all_mddevs);
241 spin_unlock(&all_mddevs_lock);
242 return new;
243 }
244 spin_unlock(&all_mddevs_lock);
245
9ffae0cf 246 new = kzalloc(sizeof(*new), GFP_KERNEL);
1da177e4
LT		 247 if (!new)
248 return NULL;
249
1da177e4
LT		 250 new->unit = unit;
251 if (MAJOR(unit) == MD_MAJOR)
252 new->md_minor = MINOR(unit);
253 else
254 new->md_minor = MINOR(unit) >> MdpMinorShift;
255
256 init_MUTEX(&new->reconfig_sem);
257 INIT_LIST_HEAD(&new->disks);
258 INIT_LIST_HEAD(&new->all_mddevs);
259 init_timer(&new->safemode_timer);
260 atomic_set(&new->active, 1);
06d91a5f 261 spin_lock_init(&new->write_lock);
3d310eb7 262 init_waitqueue_head(&new->sb_wait);
1da177e4
LT		 263
264 new->queue = blk_alloc_queue(GFP_KERNEL);
265 if (!new->queue) {
266 kfree(new);
267 return NULL;
268 }
269
270 blk_queue_make_request(new->queue, md_fail_request);
271
272 goto retry;
273}
274
275static inline int mddev_lock(mddev_t * mddev)
276{
277 return down_interruptible(&mddev->reconfig_sem);
278}
279
280static inline void mddev_lock_uninterruptible(mddev_t * mddev)
281{
282 down(&mddev->reconfig_sem);
283}
284
285static inline int mddev_trylock(mddev_t * mddev)
286{
287 return down_trylock(&mddev->reconfig_sem);
288}
289
290static inline void mddev_unlock(mddev_t * mddev)
291{
292 up(&mddev->reconfig_sem);
293
005eca5e 294 md_wakeup_thread(mddev->thread);
1da177e4
LT		 295}
296
2989ddbd 297static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
1da177e4
LT		 298{
299 mdk_rdev_t * rdev;
300 struct list_head *tmp;
301
302 ITERATE_RDEV(mddev,rdev,tmp) {
303 if (rdev->desc_nr == nr)
304 return rdev;
305 }
306 return NULL;
307}
308
309static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
310{
311 struct list_head *tmp;
312 mdk_rdev_t *rdev;
313
314 ITERATE_RDEV(mddev,rdev,tmp) {
315 if (rdev->bdev->bd_dev == dev)
316 return rdev;
317 }
318 return NULL;
319}
320
d9d166c2 321static struct mdk_personality *find_pers(int level, char *clevel)
2604b703
N		 322{
323 struct mdk_personality *pers;
d9d166c2
N		 324 list_for_each_entry(pers, &pers_list, list) {
325 if (level != LEVEL_NONE && pers->level == level)
2604b703 326 return pers;
d9d166c2
N		 327 if (strcmp(pers->name, clevel)==0)
328 return pers;
329 }
2604b703
N		 330 return NULL;
331}
332
77933d72 333static inline sector_t calc_dev_sboffset(struct block_device *bdev)
1da177e4
LT		 334{
335 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
336 return MD_NEW_SIZE_BLOCKS(size);
337}
338
339static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
340{
341 sector_t size;
342
343 size = rdev->sb_offset;
344
345 if (chunk_size)
346 size &= ~((sector_t)chunk_size/1024 - 1);
347 return size;
348}
349
350static int alloc_disk_sb(mdk_rdev_t * rdev)
351{
352 if (rdev->sb_page)
353 MD_BUG();
354
355 rdev->sb_page = alloc_page(GFP_KERNEL);
356 if (!rdev->sb_page) {
357 printk(KERN_ALERT "md: out of memory.\n");
358 return -EINVAL;
359 }
360
361 return 0;
362}
363
364static void free_disk_sb(mdk_rdev_t * rdev)
365{
366 if (rdev->sb_page) {
2d1f3b5d 367 put_page(rdev->sb_page);
1da177e4
LT		 368 rdev->sb_loaded = 0;
369 rdev->sb_page = NULL;
370 rdev->sb_offset = 0;
371 rdev->size = 0;
372 }
373}
374
375
7bfa19f2
N		 376static int super_written(struct bio *bio, unsigned int bytes_done, int error)
377{
378 mdk_rdev_t *rdev = bio->bi_private;
a9701a30 379 mddev_t *mddev = rdev->mddev;
7bfa19f2
N		 380 if (bio->bi_size)
381 return 1;
382
383 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags))
a9701a30 384 md_error(mddev, rdev);
7bfa19f2 385
a9701a30
N		 386 if (atomic_dec_and_test(&mddev->pending_writes))
387 wake_up(&mddev->sb_wait);
f8b58edf 388 bio_put(bio);
7bfa19f2
N		 389 return 0;
390}
391
a9701a30
N		 392static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
393{
394 struct bio *bio2 = bio->bi_private;
395 mdk_rdev_t *rdev = bio2->bi_private;
396 mddev_t *mddev = rdev->mddev;
397 if (bio->bi_size)
398 return 1;
399
400 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
401 error == -EOPNOTSUPP) {
402 unsigned long flags;
403 /* barriers don't appear to be supported :-( */
404 set_bit(BarriersNotsupp, &rdev->flags);
405 mddev->barriers_work = 0;
406 spin_lock_irqsave(&mddev->write_lock, flags);
407 bio2->bi_next = mddev->biolist;
408 mddev->biolist = bio2;
409 spin_unlock_irqrestore(&mddev->write_lock, flags);
410 wake_up(&mddev->sb_wait);
411 bio_put(bio);
412 return 0;
413 }
414 bio_put(bio2);
415 bio->bi_private = rdev;
416 return super_written(bio, bytes_done, error);
417}
418
7bfa19f2
N		 419void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
420 sector_t sector, int size, struct page *page)
421{
422 /* write first size bytes of page to sector of rdev
423 * Increment mddev->pending_writes before returning
424 * and decrement it on completion, waking up sb_wait
425 * if zero is reached.
426 * If an error occurred, call md_error
a9701a30
N		 427 *
428 * As we might need to resubmit the request if BIO_RW_BARRIER
429 * causes ENOTSUPP, we allocate a spare bio...
7bfa19f2
N		 430 */
431 struct bio *bio = bio_alloc(GFP_NOIO, 1);
a9701a30 432 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
7bfa19f2
N		 433
434 bio->bi_bdev = rdev->bdev;
435 bio->bi_sector = sector;
436 bio_add_page(bio, page, size, 0);
437 bio->bi_private = rdev;
438 bio->bi_end_io = super_written;
a9701a30
N		 439 bio->bi_rw = rw;
440
7bfa19f2 441 atomic_inc(&mddev->pending_writes);
a9701a30
N		 442 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
443 struct bio *rbio;
444 rw |= (1<<BIO_RW_BARRIER);
445 rbio = bio_clone(bio, GFP_NOIO);
446 rbio->bi_private = bio;
447 rbio->bi_end_io = super_written_barrier;
448 submit_bio(rw, rbio);
449 } else
450 submit_bio(rw, bio);
451}
452
453void md_super_wait(mddev_t *mddev)
454{
455 /* wait for all superblock writes that were scheduled to complete.
456 * if any had to be retried (due to BARRIER problems), retry them
457 */
458 DEFINE_WAIT(wq);
459 for(;;) {
460 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
461 if (atomic_read(&mddev->pending_writes)==0)
462 break;
463 while (mddev->biolist) {
464 struct bio *bio;
465 spin_lock_irq(&mddev->write_lock);
466 bio = mddev->biolist;
467 mddev->biolist = bio->bi_next ;
468 bio->bi_next = NULL;
469 spin_unlock_irq(&mddev->write_lock);
470 submit_bio(bio->bi_rw, bio);
471 }
472 schedule();
473 }
474 finish_wait(&mddev->sb_wait, &wq);
7bfa19f2
N		 475}
476
1da177e4
LT		 477static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
478{
479 if (bio->bi_size)
480 return 1;
481
482 complete((struct completion*)bio->bi_private);
483 return 0;
484}
485
a654b9d8 486int sync_page_io(struct block_device *bdev, sector_t sector, int size,
1da177e4
LT		 487 struct page *page, int rw)
488{
baaa2c51 489 struct bio *bio = bio_alloc(GFP_NOIO, 1);
1da177e4
LT		 490 struct completion event;
491 int ret;
492
493 rw |= (1 << BIO_RW_SYNC);
494
495 bio->bi_bdev = bdev;
496 bio->bi_sector = sector;
497 bio_add_page(bio, page, size, 0);
498 init_completion(&event);
499 bio->bi_private = &event;
500 bio->bi_end_io = bi_complete;
501 submit_bio(rw, bio);
502 wait_for_completion(&event);
503
504 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
505 bio_put(bio);
506 return ret;
507}
a8745db2 508EXPORT_SYMBOL_GPL(sync_page_io);
1da177e4 509
0002b271 510static int read_disk_sb(mdk_rdev_t * rdev, int size)
1da177e4
LT		 511{
512 char b[BDEVNAME_SIZE];
513 if (!rdev->sb_page) {
514 MD_BUG();
515 return -EINVAL;
516 }
517 if (rdev->sb_loaded)
518 return 0;
519
520
0002b271 521 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
1da177e4
LT		 522 goto fail;
523 rdev->sb_loaded = 1;
524 return 0;
525
526fail:
527 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
528 bdevname(rdev->bdev,b));
529 return -EINVAL;
530}
531
532static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
533{
534 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
535 (sb1->set_uuid1 == sb2->set_uuid1) &&
536 (sb1->set_uuid2 == sb2->set_uuid2) &&
537 (sb1->set_uuid3 == sb2->set_uuid3))
538
539 return 1;
540
541 return 0;
542}
543
544
545static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
546{
547 int ret;
548 mdp_super_t *tmp1, *tmp2;
549
550 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
551 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
552
553 if (!tmp1 || !tmp2) {
554 ret = 0;
555 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
556 goto abort;
557 }
558
559 *tmp1 = *sb1;
560 *tmp2 = *sb2;
561
562 /*
563 * nr_disks is not constant
564 */
565 tmp1->nr_disks = 0;
566 tmp2->nr_disks = 0;
567
568 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
569 ret = 0;
570 else
571 ret = 1;
572
573abort:
990a8baf
JJ		 574 kfree(tmp1);
575 kfree(tmp2);
1da177e4
LT		 576 return ret;
577}
578
579static unsigned int calc_sb_csum(mdp_super_t * sb)
580{
581 unsigned int disk_csum, csum;
582
583 disk_csum = sb->sb_csum;
584 sb->sb_csum = 0;
585 csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
586 sb->sb_csum = disk_csum;
587 return csum;
588}
589
590
591/*
592 * Handle superblock details.
593 * We want to be able to handle multiple superblock formats
594 * so we have a common interface to them all, and an array of
595 * different handlers.
596 * We rely on user-space to write the initial superblock, and support
597 * reading and updating of superblocks.
598 * Interface methods are:
599 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
600 * loads and validates a superblock on dev.
601 * if refdev != NULL, compare superblocks on both devices
602 * Return:
603 * 0 - dev has a superblock that is compatible with refdev
604 * 1 - dev has a superblock that is compatible and newer than refdev
605 * so dev should be used as the refdev in future
606 * -EINVAL superblock incompatible or invalid
607 * -othererror e.g. -EIO
608 *
609 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
610 * Verify that dev is acceptable into mddev.
611 * The first time, mddev->raid_disks will be 0, and data from
612 * dev should be merged in. Subsequent calls check that dev
613 * is new enough. Return 0 or -EINVAL
614 *
615 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
616 * Update the superblock for rdev with data in mddev
617 * This does not write to disc.
618 *
619 */
620
621struct super_type {
622 char *name;
623 struct module *owner;
624 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
625 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
626 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
627};
628
629/*
630 * load_super for 0.90.0
631 */
632static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
633{
634 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
635 mdp_super_t *sb;
636 int ret;
637 sector_t sb_offset;
638
639 /*
640 * Calculate the position of the superblock,
641 * it's at the end of the disk.
642 *
643 * It also happens to be a multiple of 4Kb.
644 */
645 sb_offset = calc_dev_sboffset(rdev->bdev);
646 rdev->sb_offset = sb_offset;
647
0002b271 648 ret = read_disk_sb(rdev, MD_SB_BYTES);
1da177e4
LT		 649 if (ret) return ret;
650
651 ret = -EINVAL;
652
653 bdevname(rdev->bdev, b);
654 sb = (mdp_super_t*)page_address(rdev->sb_page);
655
656 if (sb->md_magic != MD_SB_MAGIC) {
657 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
658 b);
659 goto abort;
660 }
661
662 if (sb->major_version != 0 ||
663 sb->minor_version != 90) {
664 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
665 sb->major_version, sb->minor_version,
666 b);
667 goto abort;
668 }
669
670 if (sb->raid_disks <= 0)
671 goto abort;
672
673 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
674 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
675 b);
676 goto abort;
677 }
678
679 rdev->preferred_minor = sb->md_minor;
680 rdev->data_offset = 0;
0002b271 681 rdev->sb_size = MD_SB_BYTES;
1da177e4
LT		 682
683 if (sb->level == LEVEL_MULTIPATH)
684 rdev->desc_nr = -1;
685 else
686 rdev->desc_nr = sb->this_disk.number;
687
688 if (refdev == 0)
689 ret = 1;
690 else {
691 __u64 ev1, ev2;
692 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
693 if (!uuid_equal(refsb, sb)) {
694 printk(KERN_WARNING "md: %s has different UUID to %s\n",
695 b, bdevname(refdev->bdev,b2));
696 goto abort;
697 }
698 if (!sb_equal(refsb, sb)) {
699 printk(KERN_WARNING "md: %s has same UUID"
700 " but different superblock to %s\n",
701 b, bdevname(refdev->bdev, b2));
702 goto abort;
703 }
704 ev1 = md_event(sb);
705 ev2 = md_event(refsb);
706 if (ev1 > ev2)
707 ret = 1;
708 else
709 ret = 0;
710 }
711 rdev->size = calc_dev_size(rdev, sb->chunk_size);
712
2bf071bf
N		 713 if (rdev->size < sb->size && sb->level > 1)
714 /* "this cannot possibly happen" ... */
715 ret = -EINVAL;
716
1da177e4
LT		 717 abort:
718 return ret;
719}
720
721/*
722 * validate_super for 0.90.0
723 */
724static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
725{
726 mdp_disk_t *desc;
727 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
728
41158c7e 729 rdev->raid_disk = -1;
b2d444d7 730 rdev->flags = 0;
1da177e4
LT		 731 if (mddev->raid_disks == 0) {
732 mddev->major_version = 0;
733 mddev->minor_version = sb->minor_version;
734 mddev->patch_version = sb->patch_version;
735 mddev->persistent = ! sb->not_persistent;
736 mddev->chunk_size = sb->chunk_size;
737 mddev->ctime = sb->ctime;
738 mddev->utime = sb->utime;
739 mddev->level = sb->level;
d9d166c2 740 mddev->clevel[0] = 0;
1da177e4
LT		 741 mddev->layout = sb->layout;
742 mddev->raid_disks = sb->raid_disks;
743 mddev->size = sb->size;
744 mddev->events = md_event(sb);
9223214e 745 mddev->bitmap_offset = 0;
36fa3063 746 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
1da177e4
LT		 747
748 if (sb->state & (1<<MD_SB_CLEAN))
749 mddev->recovery_cp = MaxSector;
750 else {
751 if (sb->events_hi == sb->cp_events_hi &&
752 sb->events_lo == sb->cp_events_lo) {
753 mddev->recovery_cp = sb->recovery_cp;
754 } else
755 mddev->recovery_cp = 0;
756 }
757
758 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
759 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
760 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
761 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
762
763 mddev->max_disks = MD_SB_DISKS;
a654b9d8
N		 764
765 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
766 mddev->bitmap_file == NULL) {
6cce3b23
N		 767 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
768 && mddev->level != 10) {
a654b9d8 769 /* FIXME use a better test */
6cce3b23 770 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
a654b9d8
N		 771 return -EINVAL;
772 }
36fa3063 773 mddev->bitmap_offset = mddev->default_bitmap_offset;
a654b9d8
N		 774 }
775
41158c7e
N		 776 } else if (mddev->pers == NULL) {
777 /* Insist on good event counter while assembling */
778 __u64 ev1 = md_event(sb);
1da177e4
LT		 779 ++ev1;
780 if (ev1 < mddev->events)
781 return -EINVAL;
41158c7e
N		 782 } else if (mddev->bitmap) {
783 /* if adding to array with a bitmap, then we can accept an
784 * older device ... but not too old.
785 */
786 __u64 ev1 = md_event(sb);
787 if (ev1 < mddev->bitmap->events_cleared)
788 return 0;
789 } else /* just a hot-add of a new device, leave raid_disk at -1 */
790 return 0;
791
1da177e4 792 if (mddev->level != LEVEL_MULTIPATH) {
1da177e4
LT		 793 desc = sb->disks + rdev->desc_nr;
794
795 if (desc->state & (1<<MD_DISK_FAULTY))
b2d444d7 796 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 797 else if (desc->state & (1<<MD_DISK_SYNC) &&
798 desc->raid_disk < mddev->raid_disks) {
b2d444d7 799 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 800 rdev->raid_disk = desc->raid_disk;
801 }
8ddf9efe
N		 802 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
803 set_bit(WriteMostly, &rdev->flags);
41158c7e 804 } else /* MULTIPATH are always insync */
b2d444d7 805 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 806 return 0;
807}
808
809/*
810 * sync_super for 0.90.0
811 */
812static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
813{
814 mdp_super_t *sb;
815 struct list_head *tmp;
816 mdk_rdev_t *rdev2;
817 int next_spare = mddev->raid_disks;
19133a42 818
1da177e4
LT		 819
820 /* make rdev->sb match mddev data..
821 *
822 * 1/ zero out disks
823 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
824 * 3/ any empty disks < next_spare become removed
825 *
826 * disks[0] gets initialised to REMOVED because
827 * we cannot be sure from other fields if it has
828 * been initialised or not.
829 */
830 int i;
831 int active=0, working=0,failed=0,spare=0,nr_disks=0;
832
61181565
N		 833 rdev->sb_size = MD_SB_BYTES;
834
1da177e4
LT		 835 sb = (mdp_super_t*)page_address(rdev->sb_page);
836
837 memset(sb, 0, sizeof(*sb));
838
839 sb->md_magic = MD_SB_MAGIC;
840 sb->major_version = mddev->major_version;
841 sb->minor_version = mddev->minor_version;
842 sb->patch_version = mddev->patch_version;
843 sb->gvalid_words = 0; /* ignored */
844 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
845 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
846 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
847 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
848
849 sb->ctime = mddev->ctime;
850 sb->level = mddev->level;
851 sb->size = mddev->size;
852 sb->raid_disks = mddev->raid_disks;
853 sb->md_minor = mddev->md_minor;
854 sb->not_persistent = !mddev->persistent;
855 sb->utime = mddev->utime;
856 sb->state = 0;
857 sb->events_hi = (mddev->events>>32);
858 sb->events_lo = (u32)mddev->events;
859
860 if (mddev->in_sync)
861 {
862 sb->recovery_cp = mddev->recovery_cp;
863 sb->cp_events_hi = (mddev->events>>32);
864 sb->cp_events_lo = (u32)mddev->events;
865 if (mddev->recovery_cp == MaxSector)
866 sb->state = (1<< MD_SB_CLEAN);
867 } else
868 sb->recovery_cp = 0;
869
870 sb->layout = mddev->layout;
871 sb->chunk_size = mddev->chunk_size;
872
a654b9d8
N		 873 if (mddev->bitmap && mddev->bitmap_file == NULL)
874 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
875
1da177e4
LT		 876 sb->disks[0].state = (1<<MD_DISK_REMOVED);
877 ITERATE_RDEV(mddev,rdev2,tmp) {
878 mdp_disk_t *d;
86e6ffdd 879 int desc_nr;
b2d444d7
N		 880 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
881 && !test_bit(Faulty, &rdev2->flags))
86e6ffdd 882 desc_nr = rdev2->raid_disk;
1da177e4 883 else
86e6ffdd 884 desc_nr = next_spare++;
19133a42 885 rdev2->desc_nr = desc_nr;
1da177e4
LT		 886 d = &sb->disks[rdev2->desc_nr];
887 nr_disks++;
888 d->number = rdev2->desc_nr;
889 d->major = MAJOR(rdev2->bdev->bd_dev);
890 d->minor = MINOR(rdev2->bdev->bd_dev);
b2d444d7
N		 891 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
892 && !test_bit(Faulty, &rdev2->flags))
1da177e4
LT		 893 d->raid_disk = rdev2->raid_disk;
894 else
895 d->raid_disk = rdev2->desc_nr; /* compatibility */
b2d444d7 896 if (test_bit(Faulty, &rdev2->flags)) {
1da177e4
LT		 897 d->state = (1<<MD_DISK_FAULTY);
898 failed++;
b2d444d7 899 } else if (test_bit(In_sync, &rdev2->flags)) {
1da177e4
LT		 900 d->state = (1<<MD_DISK_ACTIVE);
901 d->state |= (1<<MD_DISK_SYNC);
902 active++;
903 working++;
904 } else {
905 d->state = 0;
906 spare++;
907 working++;
908 }
8ddf9efe
N		 909 if (test_bit(WriteMostly, &rdev2->flags))
910 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4 911 }
1da177e4
LT		 912 /* now set the "removed" and "faulty" bits on any missing devices */
913 for (i=0 ; i < mddev->raid_disks ; i++) {
914 mdp_disk_t *d = &sb->disks[i];
915 if (d->state == 0 && d->number == 0) {
916 d->number = i;
917 d->raid_disk = i;
918 d->state = (1<<MD_DISK_REMOVED);
919 d->state |= (1<<MD_DISK_FAULTY);
920 failed++;
921 }
922 }
923 sb->nr_disks = nr_disks;
924 sb->active_disks = active;
925 sb->working_disks = working;
926 sb->failed_disks = failed;
927 sb->spare_disks = spare;
928
929 sb->this_disk = sb->disks[rdev->desc_nr];
930 sb->sb_csum = calc_sb_csum(sb);
931}
932
933/*
934 * version 1 superblock
935 */
936
937static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
938{
939 unsigned int disk_csum, csum;
940 unsigned long long newcsum;
941 int size = 256 + le32_to_cpu(sb->max_dev)*2;
942 unsigned int *isuper = (unsigned int*)sb;
943 int i;
944
945 disk_csum = sb->sb_csum;
946 sb->sb_csum = 0;
947 newcsum = 0;
948 for (i=0; size>=4; size -= 4 )
949 newcsum += le32_to_cpu(*isuper++);
950
951 if (size == 2)
952 newcsum += le16_to_cpu(*(unsigned short*) isuper);
953
954 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
955 sb->sb_csum = disk_csum;
956 return cpu_to_le32(csum);
957}
958
959static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
960{
961 struct mdp_superblock_1 *sb;
962 int ret;
963 sector_t sb_offset;
964 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 965 int bmask;
1da177e4
LT		 966
967 /*
968 * Calculate the position of the superblock.
969 * It is always aligned to a 4K boundary and
970 * depeding on minor_version, it can be:
971 * 0: At least 8K, but less than 12K, from end of device
972 * 1: At start of device
973 * 2: 4K from start of device.
974 */
975 switch(minor_version) {
976 case 0:
977 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
978 sb_offset -= 8*2;
39730960 979 sb_offset &= ~(sector_t)(4*2-1);
1da177e4
LT		 980 /* convert from sectors to K */
981 sb_offset /= 2;
982 break;
983 case 1:
984 sb_offset = 0;
985 break;
986 case 2:
987 sb_offset = 4;
988 break;
989 default:
990 return -EINVAL;
991 }
992 rdev->sb_offset = sb_offset;
993
0002b271
N		 994 /* superblock is rarely larger than 1K, but it can be larger,
995 * and it is safe to read 4k, so we do that
996 */
997 ret = read_disk_sb(rdev, 4096);
1da177e4
LT		 998 if (ret) return ret;
999
1000
1001 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1002
1003 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1004 sb->major_version != cpu_to_le32(1) ||
1005 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1006 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
71c0805c 1007 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT		 1008 return -EINVAL;
1009
1010 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1011 printk("md: invalid superblock checksum on %s\n",
1012 bdevname(rdev->bdev,b));
1013 return -EINVAL;
1014 }
1015 if (le64_to_cpu(sb->data_size) < 10) {
1016 printk("md: data_size too small on %s\n",
1017 bdevname(rdev->bdev,b));
1018 return -EINVAL;
1019 }
1020 rdev->preferred_minor = 0xffff;
1021 rdev->data_offset = le64_to_cpu(sb->data_offset);
4dbcdc75 1022 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1da177e4 1023
0002b271 1024 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
720a3dc3 1025 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
0002b271
N		 1026 if (rdev->sb_size & bmask)
1027 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1028
1da177e4 1029 if (refdev == 0)
8ed75463 1030 ret = 1;
1da177e4
LT		 1031 else {
1032 __u64 ev1, ev2;
1033 struct mdp_superblock_1 *refsb =
1034 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1035
1036 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1037 sb->level != refsb->level ||
1038 sb->layout != refsb->layout ||
1039 sb->chunksize != refsb->chunksize) {
1040 printk(KERN_WARNING "md: %s has strangely different"
1041 " superblock to %s\n",
1042 bdevname(rdev->bdev,b),
1043 bdevname(refdev->bdev,b2));
1044 return -EINVAL;
1045 }
1046 ev1 = le64_to_cpu(sb->events);
1047 ev2 = le64_to_cpu(refsb->events);
1048
1049 if (ev1 > ev2)
8ed75463
N		 1050 ret = 1;
1051 else
1052 ret = 0;
1da177e4
LT		 1053 }
1054 if (minor_version)
1055 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1056 else
1057 rdev->size = rdev->sb_offset;
1058 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1059 return -EINVAL;
1060 rdev->size = le64_to_cpu(sb->data_size)/2;
1061 if (le32_to_cpu(sb->chunksize))
1062 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
2bf071bf
N		 1063
1064 if (le32_to_cpu(sb->size) > rdev->size*2)
1065 return -EINVAL;
8ed75463 1066 return ret;
1da177e4
LT		 1067}
1068
1069static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1070{
1071 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1072
41158c7e 1073 rdev->raid_disk = -1;
b2d444d7 1074 rdev->flags = 0;
1da177e4
LT		 1075 if (mddev->raid_disks == 0) {
1076 mddev->major_version = 1;
1077 mddev->patch_version = 0;
1078 mddev->persistent = 1;
1079 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1080 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1081 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1082 mddev->level = le32_to_cpu(sb->level);
d9d166c2 1083 mddev->clevel[0] = 0;
1da177e4
LT		 1084 mddev->layout = le32_to_cpu(sb->layout);
1085 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1086 mddev->size = le64_to_cpu(sb->size)/2;
1087 mddev->events = le64_to_cpu(sb->events);
9223214e 1088 mddev->bitmap_offset = 0;
29fc7e3e 1089 mddev->default_bitmap_offset = 1024 >> 9;
1da177e4
LT		 1090
1091 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1092 memcpy(mddev->uuid, sb->set_uuid, 16);
1093
1094 mddev->max_disks = (4096-256)/2;
a654b9d8 1095
71c0805c 1096 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
a654b9d8 1097 mddev->bitmap_file == NULL ) {
6cce3b23
N		 1098 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
1099 && mddev->level != 10) {
1100 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
a654b9d8
N		 1101 return -EINVAL;
1102 }
1103 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1104 }
41158c7e
N		 1105 } else if (mddev->pers == NULL) {
1106 /* Insist of good event counter while assembling */
1107 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4
LT		 1108 ++ev1;
1109 if (ev1 < mddev->events)
1110 return -EINVAL;
41158c7e
N		 1111 } else if (mddev->bitmap) {
1112 /* If adding to array with a bitmap, then we can accept an
1113 * older device, but not too old.
1114 */
1115 __u64 ev1 = le64_to_cpu(sb->events);
1116 if (ev1 < mddev->bitmap->events_cleared)
1117 return 0;
1118 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1119 return 0;
1da177e4
LT		 1120
1121 if (mddev->level != LEVEL_MULTIPATH) {
1122 int role;
1123 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1124 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1125 switch(role) {
1126 case 0xffff: /* spare */
1da177e4
LT		 1127 break;
1128 case 0xfffe: /* faulty */
b2d444d7 1129 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 1130 break;
1131 default:
b2d444d7 1132 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1133 rdev->raid_disk = role;
1134 break;
1135 }
8ddf9efe
N		 1136 if (sb->devflags & WriteMostly1)
1137 set_bit(WriteMostly, &rdev->flags);
41158c7e 1138 } else /* MULTIPATH are always insync */
b2d444d7 1139 set_bit(In_sync, &rdev->flags);
41158c7e 1140
1da177e4
LT		 1141 return 0;
1142}
1143
1144static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1145{
1146 struct mdp_superblock_1 *sb;
1147 struct list_head *tmp;
1148 mdk_rdev_t *rdev2;
1149 int max_dev, i;
1150 /* make rdev->sb match mddev and rdev data. */
1151
1152 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1153
1154 sb->feature_map = 0;
1155 sb->pad0 = 0;
1156 memset(sb->pad1, 0, sizeof(sb->pad1));
1157 memset(sb->pad2, 0, sizeof(sb->pad2));
1158 memset(sb->pad3, 0, sizeof(sb->pad3));
1159
1160 sb->utime = cpu_to_le64((__u64)mddev->utime);
1161 sb->events = cpu_to_le64(mddev->events);
1162 if (mddev->in_sync)
1163 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1164 else
1165 sb->resync_offset = cpu_to_le64(0);
1166
4dbcdc75
N		 1167 sb->cnt_corrected_read = atomic_read(&rdev->corrected_errors);
1168
f0ca340c 1169 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
29fc7e3e 1170 sb->size = cpu_to_le64(mddev->size<<1);
f0ca340c 1171
a654b9d8
N		 1172 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1173 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
71c0805c 1174 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8
N		 1175 }
1176
1da177e4
LT		 1177 max_dev = 0;
1178 ITERATE_RDEV(mddev,rdev2,tmp)
1179 if (rdev2->desc_nr+1 > max_dev)
1180 max_dev = rdev2->desc_nr+1;
1181
1182 sb->max_dev = cpu_to_le32(max_dev);
1183 for (i=0; i<max_dev;i++)
1184 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1185
1186 ITERATE_RDEV(mddev,rdev2,tmp) {
1187 i = rdev2->desc_nr;
b2d444d7 1188 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1189 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1190 else if (test_bit(In_sync, &rdev2->flags))
1da177e4
LT		 1191 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1192 else
1193 sb->dev_roles[i] = cpu_to_le16(0xffff);
1194 }
1195
1196 sb->recovery_offset = cpu_to_le64(0); /* not supported yet */
1197 sb->sb_csum = calc_sb_1_csum(sb);
1198}
1199
1200
75c96f85 1201static struct super_type super_types[] = {
1da177e4
LT		 1202 [0] = {
1203 .name = "0.90.0",
1204 .owner = THIS_MODULE,
1205 .load_super = super_90_load,
1206 .validate_super = super_90_validate,
1207 .sync_super = super_90_sync,
1208 },
1209 [1] = {
1210 .name = "md-1",
1211 .owner = THIS_MODULE,
1212 .load_super = super_1_load,
1213 .validate_super = super_1_validate,
1214 .sync_super = super_1_sync,
1215 },
1216};
1217
1218static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1219{
1220 struct list_head *tmp;
1221 mdk_rdev_t *rdev;
1222
1223 ITERATE_RDEV(mddev,rdev,tmp)
1224 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1225 return rdev;
1226
1227 return NULL;
1228}
1229
1230static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1231{
1232 struct list_head *tmp;
1233 mdk_rdev_t *rdev;
1234
1235 ITERATE_RDEV(mddev1,rdev,tmp)
1236 if (match_dev_unit(mddev2, rdev))
1237 return 1;
1238
1239 return 0;
1240}
1241
1242static LIST_HEAD(pending_raid_disks);
1243
1244static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1245{
1246 mdk_rdev_t *same_pdev;
1247 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
f637b9f9 1248 struct kobject *ko;
1edf80d3 1249 char *s;
1da177e4
LT		 1250
1251 if (rdev->mddev) {
1252 MD_BUG();
1253 return -EINVAL;
1254 }
2bf071bf
N		 1255 /* make sure rdev->size exceeds mddev->size */
1256 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1257 if (mddev->pers)
1258 /* Cannot change size, so fail */
1259 return -ENOSPC;
1260 else
1261 mddev->size = rdev->size;
1262 }
1da177e4
LT		 1263 same_pdev = match_dev_unit(mddev, rdev);
1264 if (same_pdev)
1265 printk(KERN_WARNING
1266 "%s: WARNING: %s appears to be on the same physical"
1267 " disk as %s. True\n protection against single-disk"
1268 " failure might be compromised.\n",
1269 mdname(mddev), bdevname(rdev->bdev,b),
1270 bdevname(same_pdev->bdev,b2));
1271
1272 /* Verify rdev->desc_nr is unique.
1273 * If it is -1, assign a free number, else
1274 * check number is not in use
1275 */
1276 if (rdev->desc_nr < 0) {
1277 int choice = 0;
1278 if (mddev->pers) choice = mddev->raid_disks;
1279 while (find_rdev_nr(mddev, choice))
1280 choice++;
1281 rdev->desc_nr = choice;
1282 } else {
1283 if (find_rdev_nr(mddev, rdev->desc_nr))
1284 return -EBUSY;
1285 }
19133a42
N		 1286 bdevname(rdev->bdev,b);
1287 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1288 return -ENOMEM;
1edf80d3
NB		 1289 while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
1290 *s = '!';
1da177e4
LT		 1291
1292 list_add(&rdev->same_set, &mddev->disks);
1293 rdev->mddev = mddev;
19133a42 1294 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 1295
9c791977 1296 rdev->kobj.parent = &mddev->kobj;
86e6ffdd
N		 1297 kobject_add(&rdev->kobj);
1298
f637b9f9
N		 1299 if (rdev->bdev->bd_part)
1300 ko = &rdev->bdev->bd_part->kobj;
1301 else
1302 ko = &rdev->bdev->bd_disk->kobj;
1303 sysfs_create_link(&rdev->kobj, ko, "block");
1da177e4
LT		 1304 return 0;
1305}
1306
1307static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1308{
1309 char b[BDEVNAME_SIZE];
1310 if (!rdev->mddev) {
1311 MD_BUG();
1312 return;
1313 }
1314 list_del_init(&rdev->same_set);
1315 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1316 rdev->mddev = NULL;
86e6ffdd
N		 1317 sysfs_remove_link(&rdev->kobj, "block");
1318 kobject_del(&rdev->kobj);
1da177e4
LT		 1319}
1320
1321/*
1322 * prevent the device from being mounted, repartitioned or
1323 * otherwise reused by a RAID array (or any other kernel
1324 * subsystem), by bd_claiming the device.
1325 */
1326static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1327{
1328 int err = 0;
1329 struct block_device *bdev;
1330 char b[BDEVNAME_SIZE];
1331
1332 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1333 if (IS_ERR(bdev)) {
1334 printk(KERN_ERR "md: could not open %s.\n",
1335 __bdevname(dev, b));
1336 return PTR_ERR(bdev);
1337 }
1338 err = bd_claim(bdev, rdev);
1339 if (err) {
1340 printk(KERN_ERR "md: could not bd_claim %s.\n",
1341 bdevname(bdev, b));
1342 blkdev_put(bdev);
1343 return err;
1344 }
1345 rdev->bdev = bdev;
1346 return err;
1347}
1348
1349static void unlock_rdev(mdk_rdev_t *rdev)
1350{
1351 struct block_device *bdev = rdev->bdev;
1352 rdev->bdev = NULL;
1353 if (!bdev)
1354 MD_BUG();
1355 bd_release(bdev);
1356 blkdev_put(bdev);
1357}
1358
1359void md_autodetect_dev(dev_t dev);
1360
1361static void export_rdev(mdk_rdev_t * rdev)
1362{
1363 char b[BDEVNAME_SIZE];
1364 printk(KERN_INFO "md: export_rdev(%s)\n",
1365 bdevname(rdev->bdev,b));
1366 if (rdev->mddev)
1367 MD_BUG();
1368 free_disk_sb(rdev);
1369 list_del_init(&rdev->same_set);
1370#ifndef MODULE
1371 md_autodetect_dev(rdev->bdev->bd_dev);
1372#endif
1373 unlock_rdev(rdev);
86e6ffdd 1374 kobject_put(&rdev->kobj);
1da177e4
LT		 1375}
1376
1377static void kick_rdev_from_array(mdk_rdev_t * rdev)
1378{
1379 unbind_rdev_from_array(rdev);
1380 export_rdev(rdev);
1381}
1382
1383static void export_array(mddev_t *mddev)
1384{
1385 struct list_head *tmp;
1386 mdk_rdev_t *rdev;
1387
1388 ITERATE_RDEV(mddev,rdev,tmp) {
1389 if (!rdev->mddev) {
1390 MD_BUG();
1391 continue;
1392 }
1393 kick_rdev_from_array(rdev);
1394 }
1395 if (!list_empty(&mddev->disks))
1396 MD_BUG();
1397 mddev->raid_disks = 0;
1398 mddev->major_version = 0;
1399}
1400
1401static void print_desc(mdp_disk_t *desc)
1402{
1403 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1404 desc->major,desc->minor,desc->raid_disk,desc->state);
1405}
1406
1407static void print_sb(mdp_super_t *sb)
1408{
1409 int i;
1410
1411 printk(KERN_INFO
1412 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1413 sb->major_version, sb->minor_version, sb->patch_version,
1414 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1415 sb->ctime);
1416 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1417 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1418 sb->md_minor, sb->layout, sb->chunk_size);
1419 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1420 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1421 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1422 sb->failed_disks, sb->spare_disks,
1423 sb->sb_csum, (unsigned long)sb->events_lo);
1424
1425 printk(KERN_INFO);
1426 for (i = 0; i < MD_SB_DISKS; i++) {
1427 mdp_disk_t *desc;
1428
1429 desc = sb->disks + i;
1430 if (desc->number || desc->major || desc->minor ||
1431 desc->raid_disk || (desc->state && (desc->state != 4))) {
1432 printk(" D %2d: ", i);
1433 print_desc(desc);
1434 }
1435 }
1436 printk(KERN_INFO "md: THIS: ");
1437 print_desc(&sb->this_disk);
1438
1439}
1440
1441static void print_rdev(mdk_rdev_t *rdev)
1442{
1443 char b[BDEVNAME_SIZE];
1444 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1445 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
b2d444d7
N		 1446 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1447 rdev->desc_nr);
1da177e4
LT		 1448 if (rdev->sb_loaded) {
1449 printk(KERN_INFO "md: rdev superblock:\n");
1450 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1451 } else
1452 printk(KERN_INFO "md: no rdev superblock!\n");
1453}
1454
1455void md_print_devices(void)
1456{
1457 struct list_head *tmp, *tmp2;
1458 mdk_rdev_t *rdev;
1459 mddev_t *mddev;
1460 char b[BDEVNAME_SIZE];
1461
1462 printk("\n");
1463 printk("md: **********************************\n");
1464 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1465 printk("md: **********************************\n");
1466 ITERATE_MDDEV(mddev,tmp) {
1da177e4 1467
32a7627c
N		 1468 if (mddev->bitmap)
1469 bitmap_print_sb(mddev->bitmap);
1470 else
1471 printk("%s: ", mdname(mddev));
1da177e4
LT		 1472 ITERATE_RDEV(mddev,rdev,tmp2)
1473 printk("<%s>", bdevname(rdev->bdev,b));
1474 printk("\n");
1475
1476 ITERATE_RDEV(mddev,rdev,tmp2)
1477 print_rdev(rdev);
1478 }
1479 printk("md: **********************************\n");
1480 printk("\n");
1481}
1482
1483
1da177e4
LT		 1484static void sync_sbs(mddev_t * mddev)
1485{
1486 mdk_rdev_t *rdev;
1487 struct list_head *tmp;
1488
1489 ITERATE_RDEV(mddev,rdev,tmp) {
1490 super_types[mddev->major_version].
1491 sync_super(mddev, rdev);
1492 rdev->sb_loaded = 1;
1493 }
1494}
1495
1496static void md_update_sb(mddev_t * mddev)
1497{
7bfa19f2 1498 int err;
1da177e4
LT		 1499 struct list_head *tmp;
1500 mdk_rdev_t *rdev;
06d91a5f 1501 int sync_req;
1da177e4 1502
1da177e4 1503repeat:
a9701a30 1504 spin_lock_irq(&mddev->write_lock);
06d91a5f 1505 sync_req = mddev->in_sync;
1da177e4
LT		 1506 mddev->utime = get_seconds();
1507 mddev->events ++;
1508
1509 if (!mddev->events) {
1510 /*
1511 * oops, this 64-bit counter should never wrap.
1512 * Either we are in around ~1 trillion A.C., assuming
1513 * 1 reboot per second, or we have a bug:
1514 */
1515 MD_BUG();
1516 mddev->events --;
1517 }
7bfa19f2 1518 mddev->sb_dirty = 2;
1da177e4
LT		 1519 sync_sbs(mddev);
1520
1521 /*
1522 * do not write anything to disk if using
1523 * nonpersistent superblocks
1524 */
06d91a5f
N		 1525 if (!mddev->persistent) {
1526 mddev->sb_dirty = 0;
a9701a30 1527 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1528 wake_up(&mddev->sb_wait);
1da177e4 1529 return;
06d91a5f 1530 }
a9701a30 1531 spin_unlock_irq(&mddev->write_lock);
1da177e4
LT		 1532
1533 dprintk(KERN_INFO
1534 "md: updating %s RAID superblock on device (in sync %d)\n",
1535 mdname(mddev),mddev->in_sync);
1536
32a7627c 1537 err = bitmap_update_sb(mddev->bitmap);
1da177e4
LT		 1538 ITERATE_RDEV(mddev,rdev,tmp) {
1539 char b[BDEVNAME_SIZE];
1540 dprintk(KERN_INFO "md: ");
b2d444d7 1541 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1542 dprintk("(skipping faulty ");
1543
1544 dprintk("%s ", bdevname(rdev->bdev,b));
b2d444d7 1545 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 1546 md_super_write(mddev,rdev,
0002b271 1547 rdev->sb_offset<<1, rdev->sb_size,
7bfa19f2
N		 1548 rdev->sb_page);
1549 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1550 bdevname(rdev->bdev,b),
1551 (unsigned long long)rdev->sb_offset);
1552
1da177e4
LT		 1553 } else
1554 dprintk(")\n");
7bfa19f2 1555 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT		 1556 /* only need to write one superblock... */
1557 break;
1558 }
a9701a30 1559 md_super_wait(mddev);
7bfa19f2
N		 1560 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1561
a9701a30 1562 spin_lock_irq(&mddev->write_lock);
7bfa19f2 1563 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
06d91a5f 1564 /* have to write it out again */
a9701a30 1565 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N		 1566 goto repeat;
1567 }
1568 mddev->sb_dirty = 0;
a9701a30 1569 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1570 wake_up(&mddev->sb_wait);
06d91a5f 1571
1da177e4
LT		 1572}
1573
bce74dac
N		 1574/* words written to sysfs files may, or my not, be \n terminated.
1575 * We want to accept with case. For this we use cmd_match.
1576 */
1577static int cmd_match(const char *cmd, const char *str)
1578{
1579 /* See if cmd, written into a sysfs file, matches
1580 * str. They must either be the same, or cmd can
1581 * have a trailing newline
1582 */
1583 while (*cmd && *str && *cmd == *str) {
1584 cmd++;
1585 str++;
1586 }
1587 if (*cmd == '\n')
1588 cmd++;
1589 if (*str || *cmd)
1590 return 0;
1591 return 1;
1592}
1593
86e6ffdd
N		 1594struct rdev_sysfs_entry {
1595 struct attribute attr;
1596 ssize_t (*show)(mdk_rdev_t *, char *);
1597 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1598};
1599
1600static ssize_t
96de1e66 1601state_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1602{
1603 char *sep = "";
1604 int len=0;
1605
b2d444d7 1606 if (test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 1607 len+= sprintf(page+len, "%sfaulty",sep);
1608 sep = ",";
1609 }
b2d444d7 1610 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1611 len += sprintf(page+len, "%sin_sync",sep);
1612 sep = ",";
1613 }
b2d444d7
N		 1614 if (!test_bit(Faulty, &rdev->flags) &&
1615 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1616 len += sprintf(page+len, "%sspare", sep);
1617 sep = ",";
1618 }
1619 return len+sprintf(page+len, "\n");
1620}
1621
96de1e66
N		 1622static struct rdev_sysfs_entry
1623rdev_state = __ATTR_RO(state);
86e6ffdd
N		 1624
1625static ssize_t
96de1e66 1626super_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1627{
1628 if (rdev->sb_loaded && rdev->sb_size) {
1629 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1630 return rdev->sb_size;
1631 } else
1632 return 0;
1633}
96de1e66
N		 1634static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1635
4dbcdc75
N		 1636static ssize_t
1637errors_show(mdk_rdev_t *rdev, char *page)
1638{
1639 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1640}
1641
1642static ssize_t
1643errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1644{
1645 char *e;
1646 unsigned long n = simple_strtoul(buf, &e, 10);
1647 if (*buf && (*e == 0 || *e == '\n')) {
1648 atomic_set(&rdev->corrected_errors, n);
1649 return len;
1650 }
1651 return -EINVAL;
1652}
1653static struct rdev_sysfs_entry rdev_errors =
1654__ATTR(errors, 0644, errors_show, errors_store);
1655
014236d2
N		 1656static ssize_t
1657slot_show(mdk_rdev_t *rdev, char *page)
1658{
1659 if (rdev->raid_disk < 0)
1660 return sprintf(page, "none\n");
1661 else
1662 return sprintf(page, "%d\n", rdev->raid_disk);
1663}
1664
1665static ssize_t
1666slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1667{
1668 char *e;
1669 int slot = simple_strtoul(buf, &e, 10);
1670 if (strncmp(buf, "none", 4)==0)
1671 slot = -1;
1672 else if (e==buf || (*e && *e!= '\n'))
1673 return -EINVAL;
1674 if (rdev->mddev->pers)
1675 /* Cannot set slot in active array (yet) */
1676 return -EBUSY;
1677 if (slot >= rdev->mddev->raid_disks)
1678 return -ENOSPC;
1679 rdev->raid_disk = slot;
1680 /* assume it is working */
1681 rdev->flags = 0;
1682 set_bit(In_sync, &rdev->flags);
1683 return len;
1684}
1685
1686
1687static struct rdev_sysfs_entry rdev_slot =
1688__ATTR(slot, 0644, slot_show, slot_store);
1689
93c8cad0
N		 1690static ssize_t
1691offset_show(mdk_rdev_t *rdev, char *page)
1692{
6961ece4 1693 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
93c8cad0
N		 1694}
1695
1696static ssize_t
1697offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1698{
1699 char *e;
1700 unsigned long long offset = simple_strtoull(buf, &e, 10);
1701 if (e==buf || (*e && *e != '\n'))
1702 return -EINVAL;
1703 if (rdev->mddev->pers)
1704 return -EBUSY;
1705 rdev->data_offset = offset;
1706 return len;
1707}
1708
1709static struct rdev_sysfs_entry rdev_offset =
1710__ATTR(offset, 0644, offset_show, offset_store);
1711
83303b61
N		 1712static ssize_t
1713rdev_size_show(mdk_rdev_t *rdev, char *page)
1714{
1715 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1716}
1717
1718static ssize_t
1719rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1720{
1721 char *e;
1722 unsigned long long size = simple_strtoull(buf, &e, 10);
1723 if (e==buf || (*e && *e != '\n'))
1724 return -EINVAL;
1725 if (rdev->mddev->pers)
1726 return -EBUSY;
1727 rdev->size = size;
1728 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1729 rdev->mddev->size = size;
1730 return len;
1731}
1732
1733static struct rdev_sysfs_entry rdev_size =
1734__ATTR(size, 0644, rdev_size_show, rdev_size_store);
1735
86e6ffdd
N		 1736static struct attribute *rdev_default_attrs[] = {
1737 &rdev_state.attr,
1738 &rdev_super.attr,
4dbcdc75 1739 &rdev_errors.attr,
014236d2 1740 &rdev_slot.attr,
93c8cad0 1741 &rdev_offset.attr,
83303b61 1742 &rdev_size.attr,
86e6ffdd
N		 1743 NULL,
1744};
1745static ssize_t
1746rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1747{
1748 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1749 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1750
1751 if (!entry->show)
1752 return -EIO;
1753 return entry->show(rdev, page);
1754}
1755
1756static ssize_t
1757rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1758 const char *page, size_t length)
1759{
1760 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1761 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1762
1763 if (!entry->store)
1764 return -EIO;
1765 return entry->store(rdev, page, length);
1766}
1767
1768static void rdev_free(struct kobject *ko)
1769{
1770 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1771 kfree(rdev);
1772}
1773static struct sysfs_ops rdev_sysfs_ops = {
1774 .show = rdev_attr_show,
1775 .store = rdev_attr_store,
1776};
1777static struct kobj_type rdev_ktype = {
1778 .release = rdev_free,
1779 .sysfs_ops = &rdev_sysfs_ops,
1780 .default_attrs = rdev_default_attrs,
1781};
1782
1da177e4
LT		 1783/*
1784 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1785 *
1786 * mark the device faulty if:
1787 *
1788 * - the device is nonexistent (zero size)
1789 * - the device has no valid superblock
1790 *
1791 * a faulty rdev _never_ has rdev->sb set.
1792 */
1793static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1794{
1795 char b[BDEVNAME_SIZE];
1796 int err;
1797 mdk_rdev_t *rdev;
1798 sector_t size;
1799
9ffae0cf 1800 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1da177e4
LT		 1801 if (!rdev) {
1802 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1803 return ERR_PTR(-ENOMEM);
1804 }
1da177e4
LT		 1805
1806 if ((err = alloc_disk_sb(rdev)))
1807 goto abort_free;
1808
1809 err = lock_rdev(rdev, newdev);
1810 if (err)
1811 goto abort_free;
1812
86e6ffdd
N		 1813 rdev->kobj.parent = NULL;
1814 rdev->kobj.ktype = &rdev_ktype;
1815 kobject_init(&rdev->kobj);
1816
1da177e4 1817 rdev->desc_nr = -1;
b2d444d7 1818 rdev->flags = 0;
1da177e4
LT		 1819 rdev->data_offset = 0;
1820 atomic_set(&rdev->nr_pending, 0);
ba22dcbf 1821 atomic_set(&rdev->read_errors, 0);
4dbcdc75 1822 atomic_set(&rdev->corrected_errors, 0);
1da177e4
LT		 1823
1824 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
1825 if (!size) {
1826 printk(KERN_WARNING
1827 "md: %s has zero or unknown size, marking faulty!\n",
1828 bdevname(rdev->bdev,b));
1829 err = -EINVAL;
1830 goto abort_free;
1831 }
1832
1833 if (super_format >= 0) {
1834 err = super_types[super_format].
1835 load_super(rdev, NULL, super_minor);
1836 if (err == -EINVAL) {
1837 printk(KERN_WARNING
1838 "md: %s has invalid sb, not importing!\n",
1839 bdevname(rdev->bdev,b));
1840 goto abort_free;
1841 }
1842 if (err < 0) {
1843 printk(KERN_WARNING
1844 "md: could not read %s's sb, not importing!\n",
1845 bdevname(rdev->bdev,b));
1846 goto abort_free;
1847 }
1848 }
1849 INIT_LIST_HEAD(&rdev->same_set);
1850
1851 return rdev;
1852
1853abort_free:
1854 if (rdev->sb_page) {
1855 if (rdev->bdev)
1856 unlock_rdev(rdev);
1857 free_disk_sb(rdev);
1858 }
1859 kfree(rdev);
1860 return ERR_PTR(err);
1861}
1862
1863/*
1864 * Check a full RAID array for plausibility
1865 */
1866
1867
a757e64c 1868static void analyze_sbs(mddev_t * mddev)
1da177e4
LT		 1869{
1870 int i;
1871 struct list_head *tmp;
1872 mdk_rdev_t *rdev, *freshest;
1873 char b[BDEVNAME_SIZE];
1874
1875 freshest = NULL;
1876 ITERATE_RDEV(mddev,rdev,tmp)
1877 switch (super_types[mddev->major_version].
1878 load_super(rdev, freshest, mddev->minor_version)) {
1879 case 1:
1880 freshest = rdev;
1881 break;
1882 case 0:
1883 break;
1884 default:
1885 printk( KERN_ERR \
1886 "md: fatal superblock inconsistency in %s"
1887 " -- removing from array\n",
1888 bdevname(rdev->bdev,b));
1889 kick_rdev_from_array(rdev);
1890 }
1891
1892
1893 super_types[mddev->major_version].
1894 validate_super(mddev, freshest);
1895
1896 i = 0;
1897 ITERATE_RDEV(mddev,rdev,tmp) {
1898 if (rdev != freshest)
1899 if (super_types[mddev->major_version].
1900 validate_super(mddev, rdev)) {
1901 printk(KERN_WARNING "md: kicking non-fresh %s"
1902 " from array!\n",
1903 bdevname(rdev->bdev,b));
1904 kick_rdev_from_array(rdev);
1905 continue;
1906 }
1907 if (mddev->level == LEVEL_MULTIPATH) {
1908 rdev->desc_nr = i++;
1909 rdev->raid_disk = rdev->desc_nr;
b2d444d7 1910 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1911 }
1912 }
1913
1914
1915
1916 if (mddev->recovery_cp != MaxSector &&
1917 mddev->level >= 1)
1918 printk(KERN_ERR "md: %s: raid array is not clean"
1919 " -- starting background reconstruction\n",
1920 mdname(mddev));
1921
1da177e4
LT		 1922}
1923
eae1701f 1924static ssize_t
96de1e66 1925level_show(mddev_t *mddev, char *page)
eae1701f 1926{
2604b703 1927 struct mdk_personality *p = mddev->pers;
d9d166c2 1928 if (p)
eae1701f 1929 return sprintf(page, "%s\n", p->name);
d9d166c2
N		 1930 else if (mddev->clevel[0])
1931 return sprintf(page, "%s\n", mddev->clevel);
1932 else if (mddev->level != LEVEL_NONE)
1933 return sprintf(page, "%d\n", mddev->level);
1934 else
1935 return 0;
eae1701f
N		 1936}
1937
d9d166c2
N		 1938static ssize_t
1939level_store(mddev_t *mddev, const char *buf, size_t len)
1940{
1941 int rv = len;
1942 if (mddev->pers)
1943 return -EBUSY;
1944 if (len == 0)
1945 return 0;
1946 if (len >= sizeof(mddev->clevel))
1947 return -ENOSPC;
1948 strncpy(mddev->clevel, buf, len);
1949 if (mddev->clevel[len-1] == '\n')
1950 len--;
1951 mddev->clevel[len] = 0;
1952 mddev->level = LEVEL_NONE;
1953 return rv;
1954}
1955
1956static struct md_sysfs_entry md_level =
1957__ATTR(level, 0644, level_show, level_store);
eae1701f
N		 1958
1959static ssize_t
96de1e66 1960raid_disks_show(mddev_t *mddev, char *page)
eae1701f 1961{
bb636547
N		 1962 if (mddev->raid_disks == 0)
1963 return 0;
eae1701f
N		 1964 return sprintf(page, "%d\n", mddev->raid_disks);
1965}
1966
da943b99
N		 1967static int update_raid_disks(mddev_t *mddev, int raid_disks);
1968
1969static ssize_t
1970raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
1971{
1972 /* can only set raid_disks if array is not yet active */
1973 char *e;
1974 int rv = 0;
1975 unsigned long n = simple_strtoul(buf, &e, 10);
1976
1977 if (!*buf || (*e && *e != '\n'))
1978 return -EINVAL;
1979
1980 if (mddev->pers)
1981 rv = update_raid_disks(mddev, n);
1982 else
1983 mddev->raid_disks = n;
1984 return rv ? rv : len;
1985}
1986static struct md_sysfs_entry md_raid_disks =
1987__ATTR(raid_disks, 0644, raid_disks_show, raid_disks_store);
eae1701f 1988
3b34380a
N		 1989static ssize_t
1990chunk_size_show(mddev_t *mddev, char *page)
1991{
1992 return sprintf(page, "%d\n", mddev->chunk_size);
1993}
1994
1995static ssize_t
1996chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
1997{
1998 /* can only set chunk_size if array is not yet active */
1999 char *e;
2000 unsigned long n = simple_strtoul(buf, &e, 10);
2001
2002 if (mddev->pers)
2003 return -EBUSY;
2004 if (!*buf || (*e && *e != '\n'))
2005 return -EINVAL;
2006
2007 mddev->chunk_size = n;
2008 return len;
2009}
2010static struct md_sysfs_entry md_chunk_size =
2011__ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
2012
6d7ff738
N		 2013static ssize_t
2014null_show(mddev_t *mddev, char *page)
2015{
2016 return -EINVAL;
2017}
2018
2019static ssize_t
2020new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2021{
2022 /* buf must be %d:%d\n? giving major and minor numbers */
2023 /* The new device is added to the array.
2024 * If the array has a persistent superblock, we read the
2025 * superblock to initialise info and check validity.
2026 * Otherwise, only checking done is that in bind_rdev_to_array,
2027 * which mainly checks size.
2028 */
2029 char *e;
2030 int major = simple_strtoul(buf, &e, 10);
2031 int minor;
2032 dev_t dev;
2033 mdk_rdev_t *rdev;
2034 int err;
2035
2036 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2037 return -EINVAL;
2038 minor = simple_strtoul(e+1, &e, 10);
2039 if (*e && *e != '\n')
2040 return -EINVAL;
2041 dev = MKDEV(major, minor);
2042 if (major != MAJOR(dev) ||
2043 minor != MINOR(dev))
2044 return -EOVERFLOW;
2045
2046
2047 if (mddev->persistent) {
2048 rdev = md_import_device(dev, mddev->major_version,
2049 mddev->minor_version);
2050 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2051 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2052 mdk_rdev_t, same_set);
2053 err = super_types[mddev->major_version]
2054 .load_super(rdev, rdev0, mddev->minor_version);
2055 if (err < 0)
2056 goto out;
2057 }
2058 } else
2059 rdev = md_import_device(dev, -1, -1);
2060
2061 if (IS_ERR(rdev))
2062 return PTR_ERR(rdev);
2063 err = bind_rdev_to_array(rdev, mddev);
2064 out:
2065 if (err)
2066 export_rdev(rdev);
2067 return err ? err : len;
2068}
2069
2070static struct md_sysfs_entry md_new_device =
2071__ATTR(new_dev, 0200, null_show, new_dev_store);
3b34380a 2072
a35b0d69
N		 2073static ssize_t
2074size_show(mddev_t *mddev, char *page)
2075{
2076 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2077}
2078
2079static int update_size(mddev_t *mddev, unsigned long size);
2080
2081static ssize_t
2082size_store(mddev_t *mddev, const char *buf, size_t len)
2083{
2084 /* If array is inactive, we can reduce the component size, but
2085 * not increase it (except from 0).
2086 * If array is active, we can try an on-line resize
2087 */
2088 char *e;
2089 int err = 0;
2090 unsigned long long size = simple_strtoull(buf, &e, 10);
2091 if (!*buf || *buf == '\n' ||
2092 (*e && *e != '\n'))
2093 return -EINVAL;
2094
2095 if (mddev->pers) {
2096 err = update_size(mddev, size);
2097 md_update_sb(mddev);
2098 } else {
2099 if (mddev->size == 0 ||
2100 mddev->size > size)
2101 mddev->size = size;
2102 else
2103 err = -ENOSPC;
2104 }
2105 return err ? err : len;
2106}
2107
2108static struct md_sysfs_entry md_size =
2109__ATTR(component_size, 0644, size_show, size_store);
2110
8bb93aac
N		 2111
2112/* Metdata version.
2113 * This is either 'none' for arrays with externally managed metadata,
2114 * or N.M for internally known formats
2115 */
2116static ssize_t
2117metadata_show(mddev_t *mddev, char *page)
2118{
2119 if (mddev->persistent)
2120 return sprintf(page, "%d.%d\n",
2121 mddev->major_version, mddev->minor_version);
2122 else
2123 return sprintf(page, "none\n");
2124}
2125
2126static ssize_t
2127metadata_store(mddev_t *mddev, const char *buf, size_t len)
2128{
2129 int major, minor;
2130 char *e;
2131 if (!list_empty(&mddev->disks))
2132 return -EBUSY;
2133
2134 if (cmd_match(buf, "none")) {
2135 mddev->persistent = 0;
2136 mddev->major_version = 0;
2137 mddev->minor_version = 90;
2138 return len;
2139 }
2140 major = simple_strtoul(buf, &e, 10);
2141 if (e==buf || *e != '.')
2142 return -EINVAL;
2143 buf = e+1;
2144 minor = simple_strtoul(buf, &e, 10);
2145 if (e==buf || *e != '\n')
2146 return -EINVAL;
2147 if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
2148 super_types[major].name == NULL)
2149 return -ENOENT;
2150 mddev->major_version = major;
2151 mddev->minor_version = minor;
2152 mddev->persistent = 1;
2153 return len;
2154}
2155
2156static struct md_sysfs_entry md_metadata =
2157__ATTR(metadata_version, 0644, metadata_show, metadata_store);
2158
24dd469d 2159static ssize_t
7eec314d 2160action_show(mddev_t *mddev, char *page)
24dd469d 2161{
7eec314d 2162 char *type = "idle";
31399d9e
N		 2163 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2164 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
2165 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N		 2166 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2167 type = "resync";
2168 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2169 type = "check";
2170 else
2171 type = "repair";
2172 } else
2173 type = "recover";
2174 }
2175 return sprintf(page, "%s\n", type);
2176}
2177
2178static ssize_t
7eec314d 2179action_store(mddev_t *mddev, const char *page, size_t len)
24dd469d 2180{
7eec314d
N		 2181 if (!mddev->pers || !mddev->pers->sync_request)
2182 return -EINVAL;
2183
bce74dac 2184 if (cmd_match(page, "idle")) {
7eec314d
N		 2185 if (mddev->sync_thread) {
2186 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2187 md_unregister_thread(mddev->sync_thread);
2188 mddev->sync_thread = NULL;
2189 mddev->recovery = 0;
2190 }
03c902e1
N		 2191 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2192 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 2193 return -EBUSY;
03c902e1 2194 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
7eec314d
N		 2195 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2196 else {
bce74dac 2197 if (cmd_match(page, "check"))
7eec314d 2198 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
bce74dac 2199 else if (cmd_match(page, "repair"))
7eec314d
N		 2200 return -EINVAL;
2201 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2202 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7eec314d 2203 }
03c902e1 2204 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d
N		 2205 md_wakeup_thread(mddev->thread);
2206 return len;
2207}
2208
9d88883e 2209static ssize_t
96de1e66 2210mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 2211{
2212 return sprintf(page, "%llu\n",
2213 (unsigned long long) mddev->resync_mismatches);
2214}
2215
96de1e66 2216static struct md_sysfs_entry
7eec314d 2217md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 2218
96de1e66
N		 2219
2220static struct md_sysfs_entry
2221md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 2222
88202a0c
N		 2223static ssize_t
2224sync_min_show(mddev_t *mddev, char *page)
2225{
2226 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2227 mddev->sync_speed_min ? "local": "system");
2228}
2229
2230static ssize_t
2231sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2232{
2233 int min;
2234 char *e;
2235 if (strncmp(buf, "system", 6)==0) {
2236 mddev->sync_speed_min = 0;
2237 return len;
2238 }
2239 min = simple_strtoul(buf, &e, 10);
2240 if (buf == e || (*e && *e != '\n') || min <= 0)
2241 return -EINVAL;
2242 mddev->sync_speed_min = min;
2243 return len;
2244}
2245
2246static struct md_sysfs_entry md_sync_min =
2247__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2248
2249static ssize_t
2250sync_max_show(mddev_t *mddev, char *page)
2251{
2252 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2253 mddev->sync_speed_max ? "local": "system");
2254}
2255
2256static ssize_t
2257sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2258{
2259 int max;
2260 char *e;
2261 if (strncmp(buf, "system", 6)==0) {
2262 mddev->sync_speed_max = 0;
2263 return len;
2264 }
2265 max = simple_strtoul(buf, &e, 10);
2266 if (buf == e || (*e && *e != '\n') || max <= 0)
2267 return -EINVAL;
2268 mddev->sync_speed_max = max;
2269 return len;
2270}
2271
2272static struct md_sysfs_entry md_sync_max =
2273__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2274
2275
2276static ssize_t
2277sync_speed_show(mddev_t *mddev, char *page)
2278{
2279 unsigned long resync, dt, db;
2280 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2281 dt = ((jiffies - mddev->resync_mark) / HZ);
2282 if (!dt) dt++;
2283 db = resync - (mddev->resync_mark_cnt);
2284 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2285}
2286
2287static struct md_sysfs_entry
2288md_sync_speed = __ATTR_RO(sync_speed);
2289
2290static ssize_t
2291sync_completed_show(mddev_t *mddev, char *page)
2292{
2293 unsigned long max_blocks, resync;
2294
2295 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2296 max_blocks = mddev->resync_max_sectors;
2297 else
2298 max_blocks = mddev->size << 1;
2299
2300 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2301 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2302}
2303
2304static struct md_sysfs_entry
2305md_sync_completed = __ATTR_RO(sync_completed);
2306
eae1701f
N		 2307static struct attribute *md_default_attrs[] = {
2308 &md_level.attr,
2309 &md_raid_disks.attr,
3b34380a 2310 &md_chunk_size.attr,
a35b0d69 2311 &md_size.attr,
8bb93aac 2312 &md_metadata.attr,
6d7ff738 2313 &md_new_device.attr,
411036fa
N		 2314 NULL,
2315};
2316
2317static struct attribute *md_redundancy_attrs[] = {
24dd469d 2318 &md_scan_mode.attr,
9d88883e 2319 &md_mismatches.attr,
88202a0c
N		 2320 &md_sync_min.attr,
2321 &md_sync_max.attr,
2322 &md_sync_speed.attr,
2323 &md_sync_completed.attr,
eae1701f
N		 2324 NULL,
2325};
411036fa
N		 2326static struct attribute_group md_redundancy_group = {
2327 .name = NULL,
2328 .attrs = md_redundancy_attrs,
2329};
2330
eae1701f
N		 2331
2332static ssize_t
2333md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2334{
2335 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2336 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2337 ssize_t rv;
eae1701f
N		 2338
2339 if (!entry->show)
2340 return -EIO;
96de1e66
N		 2341 mddev_lock(mddev);
2342 rv = entry->show(mddev, page);
2343 mddev_unlock(mddev);
2344 return rv;
eae1701f
N		 2345}
2346
2347static ssize_t
2348md_attr_store(struct kobject *kobj, struct attribute *attr,
2349 const char *page, size_t length)
2350{
2351 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2352 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2353 ssize_t rv;
eae1701f
N		 2354
2355 if (!entry->store)
2356 return -EIO;
96de1e66
N		 2357 mddev_lock(mddev);
2358 rv = entry->store(mddev, page, length);
2359 mddev_unlock(mddev);
2360 return rv;
eae1701f
N		 2361}
2362
2363static void md_free(struct kobject *ko)
2364{
2365 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2366 kfree(mddev);
2367}
2368
2369static struct sysfs_ops md_sysfs_ops = {
2370 .show = md_attr_show,
2371 .store = md_attr_store,
2372};
2373static struct kobj_type md_ktype = {
2374 .release = md_free,
2375 .sysfs_ops = &md_sysfs_ops,
2376 .default_attrs = md_default_attrs,
2377};
2378
1da177e4
LT		 2379int mdp_major = 0;
2380
2381static struct kobject *md_probe(dev_t dev, int *part, void *data)
2382{
2383 static DECLARE_MUTEX(disks_sem);
2384 mddev_t *mddev = mddev_find(dev);
2385 struct gendisk *disk;
2386 int partitioned = (MAJOR(dev) != MD_MAJOR);
2387 int shift = partitioned ? MdpMinorShift : 0;
2388 int unit = MINOR(dev) >> shift;
2389
2390 if (!mddev)
2391 return NULL;
2392
2393 down(&disks_sem);
2394 if (mddev->gendisk) {
2395 up(&disks_sem);
2396 mddev_put(mddev);
2397 return NULL;
2398 }
2399 disk = alloc_disk(1 << shift);
2400 if (!disk) {
2401 up(&disks_sem);
2402 mddev_put(mddev);
2403 return NULL;
2404 }
2405 disk->major = MAJOR(dev);
2406 disk->first_minor = unit << shift;
2407 if (partitioned) {
2408 sprintf(disk->disk_name, "md_d%d", unit);
2409 sprintf(disk->devfs_name, "md/d%d", unit);
2410 } else {
2411 sprintf(disk->disk_name, "md%d", unit);
2412 sprintf(disk->devfs_name, "md/%d", unit);
2413 }
2414 disk->fops = &md_fops;
2415 disk->private_data = mddev;
2416 disk->queue = mddev->queue;
2417 add_disk(disk);
2418 mddev->gendisk = disk;
2419 up(&disks_sem);
9c791977 2420 mddev->kobj.parent = &disk->kobj;
eae1701f
N		 2421 mddev->kobj.k_name = NULL;
2422 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
2423 mddev->kobj.ktype = &md_ktype;
2424 kobject_register(&mddev->kobj);
1da177e4
LT		 2425 return NULL;
2426}
2427
2428void md_wakeup_thread(mdk_thread_t *thread);
2429
2430static void md_safemode_timeout(unsigned long data)
2431{
2432 mddev_t *mddev = (mddev_t *) data;
2433
2434 mddev->safemode = 1;
2435 md_wakeup_thread(mddev->thread);
2436}
2437
6ff8d8ec 2438static int start_dirty_degraded;
1da177e4
LT		 2439
2440static int do_md_run(mddev_t * mddev)
2441{
2604b703 2442 int err;
1da177e4
LT		 2443 int chunk_size;
2444 struct list_head *tmp;
2445 mdk_rdev_t *rdev;
2446 struct gendisk *disk;
2604b703 2447 struct mdk_personality *pers;
1da177e4
LT		 2448 char b[BDEVNAME_SIZE];
2449
a757e64c
N		 2450 if (list_empty(&mddev->disks))
2451 /* cannot run an array with no devices.. */
1da177e4 2452 return -EINVAL;
1da177e4
LT		 2453
2454 if (mddev->pers)
2455 return -EBUSY;
2456
2457 /*
2458 * Analyze all RAID superblock(s)
2459 */
a757e64c
N		 2460 if (!mddev->raid_disks)
2461 analyze_sbs(mddev);
1da177e4
LT		 2462
2463 chunk_size = mddev->chunk_size;
2604b703
N		 2464
2465 if (chunk_size) {
1da177e4
LT		 2466 if (chunk_size > MAX_CHUNK_SIZE) {
2467 printk(KERN_ERR "too big chunk_size: %d > %d\n",
2468 chunk_size, MAX_CHUNK_SIZE);
2469 return -EINVAL;
2470 }
2471 /*
2472 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2473 */
2474 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 2475 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 2476 return -EINVAL;
2477 }
2478 if (chunk_size < PAGE_SIZE) {
2479 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
2480 chunk_size, PAGE_SIZE);
2481 return -EINVAL;
2482 }
2483
2484 /* devices must have minimum size of one chunk */
2485 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2486 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2487 continue;
2488 if (rdev->size < chunk_size / 1024) {
2489 printk(KERN_WARNING
2490 "md: Dev %s smaller than chunk_size:"
2491 " %lluk < %dk\n",
2492 bdevname(rdev->bdev,b),
2493 (unsigned long long)rdev->size,
2494 chunk_size / 1024);
2495 return -EINVAL;
2496 }
2497 }
2498 }
2499
1da177e4 2500#ifdef CONFIG_KMOD
d9d166c2
N		 2501 if (mddev->level != LEVEL_NONE)
2502 request_module("md-level-%d", mddev->level);
2503 else if (mddev->clevel[0])
2504 request_module("md-%s", mddev->clevel);
1da177e4
LT		 2505#endif
2506
2507 /*
2508 * Drop all container device buffers, from now on
2509 * the only valid external interface is through the md
2510 * device.
2511 * Also find largest hardsector size
2512 */
2513 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2514 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2515 continue;
2516 sync_blockdev(rdev->bdev);
2517 invalidate_bdev(rdev->bdev, 0);
2518 }
2519
2520 md_probe(mddev->unit, NULL, NULL);
2521 disk = mddev->gendisk;
2522 if (!disk)
2523 return -ENOMEM;
2524
2525 spin_lock(&pers_lock);
d9d166c2 2526 pers = find_pers(mddev->level, mddev->clevel);
2604b703 2527 if (!pers || !try_module_get(pers->owner)) {
1da177e4 2528 spin_unlock(&pers_lock);
d9d166c2
N		 2529 if (mddev->level != LEVEL_NONE)
2530 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
2531 mddev->level);
2532 else
2533 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
2534 mddev->clevel);
1da177e4
LT		 2535 return -EINVAL;
2536 }
2604b703 2537 mddev->pers = pers;
1da177e4 2538 spin_unlock(&pers_lock);
d9d166c2
N		 2539 mddev->level = pers->level;
2540 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
1da177e4 2541
657390d2 2542 mddev->recovery = 0;
1da177e4 2543 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 2544 mddev->barriers_work = 1;
6ff8d8ec 2545 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 2546
f91de92e
N		 2547 if (start_readonly)
2548 mddev->ro = 2; /* read-only, but switch on first write */
2549
b15c2e57
N		 2550 err = mddev->pers->run(mddev);
2551 if (!err && mddev->pers->sync_request) {
2552 err = bitmap_create(mddev);
2553 if (err) {
2554 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
2555 mdname(mddev), err);
2556 mddev->pers->stop(mddev);
2557 }
2558 }
1da177e4
LT		 2559 if (err) {
2560 printk(KERN_ERR "md: pers->run() failed ...\n");
2561 module_put(mddev->pers->owner);
2562 mddev->pers = NULL;
32a7627c
N		 2563 bitmap_destroy(mddev);
2564 return err;
1da177e4 2565 }
411036fa
N		 2566 if (mddev->pers->sync_request)
2567 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
fd9d49ca
N		 2568 else if (mddev->ro == 2) /* auto-readonly not meaningful */
2569 mddev->ro = 0;
2570
1da177e4
LT		 2571 atomic_set(&mddev->writes_pending,0);
2572 mddev->safemode = 0;
2573 mddev->safemode_timer.function = md_safemode_timeout;
2574 mddev->safemode_timer.data = (unsigned long) mddev;
2575 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */
2576 mddev->in_sync = 1;
86e6ffdd
N		 2577
2578 ITERATE_RDEV(mddev,rdev,tmp)
2579 if (rdev->raid_disk >= 0) {
2580 char nm[20];
2581 sprintf(nm, "rd%d", rdev->raid_disk);
2582 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2583 }
1da177e4
LT		 2584
2585 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 2586 md_wakeup_thread(mddev->thread);
1da177e4
LT		 2587
2588 if (mddev->sb_dirty)
2589 md_update_sb(mddev);
2590
2591 set_capacity(disk, mddev->array_size<<1);
2592
2593 /* If we call blk_queue_make_request here, it will
2594 * re-initialise max_sectors etc which may have been
2595 * refined inside -> run. So just set the bits we need to set.
2596 * Most initialisation happended when we called
2597 * blk_queue_make_request(..., md_fail_request)
2598 * earlier.
2599 */
2600 mddev->queue->queuedata = mddev;
2601 mddev->queue->make_request_fn = mddev->pers->make_request;
2602
2603 mddev->changed = 1;
d7603b7e 2604 md_new_event(mddev);
1da177e4
LT		 2605 return 0;
2606}
2607
2608static int restart_array(mddev_t *mddev)
2609{
2610 struct gendisk *disk = mddev->gendisk;
2611 int err;
2612
2613 /*
2614 * Complain if it has no devices
2615 */
2616 err = -ENXIO;
2617 if (list_empty(&mddev->disks))
2618 goto out;
2619
2620 if (mddev->pers) {
2621 err = -EBUSY;
2622 if (!mddev->ro)
2623 goto out;
2624
2625 mddev->safemode = 0;
2626 mddev->ro = 0;
2627 set_disk_ro(disk, 0);
2628
2629 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2630 mdname(mddev));
2631 /*
2632 * Kick recovery or resync if necessary
2633 */
2634 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2635 md_wakeup_thread(mddev->thread);
2636 err = 0;
2637 } else {
2638 printk(KERN_ERR "md: %s has no personality assigned.\n",
2639 mdname(mddev));
2640 err = -EINVAL;
2641 }
2642
2643out:
2644 return err;
2645}
2646
2647static int do_md_stop(mddev_t * mddev, int ro)
2648{
2649 int err = 0;
2650 struct gendisk *disk = mddev->gendisk;
2651
2652 if (mddev->pers) {
2653 if (atomic_read(&mddev->active)>2) {
2654 printk("md: %s still in use.\n",mdname(mddev));
2655 return -EBUSY;
2656 }
2657
2658 if (mddev->sync_thread) {
2659 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2660 md_unregister_thread(mddev->sync_thread);
2661 mddev->sync_thread = NULL;
2662 }
2663
2664 del_timer_sync(&mddev->safemode_timer);
2665
2666 invalidate_partition(disk, 0);
2667
2668 if (ro) {
2669 err = -ENXIO;
f91de92e 2670 if (mddev->ro==1)
1da177e4
LT		 2671 goto out;
2672 mddev->ro = 1;
2673 } else {
6b8b3e8a 2674 bitmap_flush(mddev);
a9701a30 2675 md_super_wait(mddev);
1da177e4
LT		 2676 if (mddev->ro)
2677 set_disk_ro(disk, 0);
2678 blk_queue_make_request(mddev->queue, md_fail_request);
2679 mddev->pers->stop(mddev);
411036fa
N		 2680 if (mddev->pers->sync_request)
2681 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
2682
1da177e4
LT		 2683 module_put(mddev->pers->owner);
2684 mddev->pers = NULL;
2685 if (mddev->ro)
2686 mddev->ro = 0;
2687 }
2688 if (!mddev->in_sync) {
2689 /* mark array as shutdown cleanly */
2690 mddev->in_sync = 1;
2691 md_update_sb(mddev);
2692 }
2693 if (ro)
2694 set_disk_ro(disk, 1);
2695 }
32a7627c 2696
1da177e4
LT		 2697 /*
2698 * Free resources if final stop
2699 */
2700 if (!ro) {
86e6ffdd
N		 2701 mdk_rdev_t *rdev;
2702 struct list_head *tmp;
1da177e4
LT		 2703 struct gendisk *disk;
2704 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
2705
978f946b
N		 2706 bitmap_destroy(mddev);
2707 if (mddev->bitmap_file) {
2708 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
2709 fput(mddev->bitmap_file);
2710 mddev->bitmap_file = NULL;
2711 }
2712 mddev->bitmap_offset = 0;
2713
86e6ffdd
N		 2714 ITERATE_RDEV(mddev,rdev,tmp)
2715 if (rdev->raid_disk >= 0) {
2716 char nm[20];
2717 sprintf(nm, "rd%d", rdev->raid_disk);
2718 sysfs_remove_link(&mddev->kobj, nm);
2719 }
2720
1da177e4
LT		 2721 export_array(mddev);
2722
2723 mddev->array_size = 0;
2724 disk = mddev->gendisk;
2725 if (disk)
2726 set_capacity(disk, 0);
2727 mddev->changed = 1;
2728 } else
2729 printk(KERN_INFO "md: %s switched to read-only mode.\n",
2730 mdname(mddev));
2731 err = 0;
d7603b7e 2732 md_new_event(mddev);
1da177e4
LT		 2733out:
2734 return err;
2735}
2736
2737static void autorun_array(mddev_t *mddev)
2738{
2739 mdk_rdev_t *rdev;
2740 struct list_head *tmp;
2741 int err;
2742
a757e64c 2743 if (list_empty(&mddev->disks))
1da177e4 2744 return;
1da177e4
LT		 2745
2746 printk(KERN_INFO "md: running: ");
2747
2748 ITERATE_RDEV(mddev,rdev,tmp) {
2749 char b[BDEVNAME_SIZE];
2750 printk("<%s>", bdevname(rdev->bdev,b));
2751 }
2752 printk("\n");
2753
2754 err = do_md_run (mddev);
2755 if (err) {
2756 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
2757 do_md_stop (mddev, 0);
2758 }
2759}
2760
2761/*
2762 * lets try to run arrays based on all disks that have arrived
2763 * until now. (those are in pending_raid_disks)
2764 *
2765 * the method: pick the first pending disk, collect all disks with
2766 * the same UUID, remove all from the pending list and put them into
2767 * the 'same_array' list. Then order this list based on superblock
2768 * update time (freshest comes first), kick out 'old' disks and
2769 * compare superblocks. If everything's fine then run it.
2770 *
2771 * If "unit" is allocated, then bump its reference count
2772 */
2773static void autorun_devices(int part)
2774{
2775 struct list_head candidates;
2776 struct list_head *tmp;
2777 mdk_rdev_t *rdev0, *rdev;
2778 mddev_t *mddev;
2779 char b[BDEVNAME_SIZE];
2780
2781 printk(KERN_INFO "md: autorun ...\n");
2782 while (!list_empty(&pending_raid_disks)) {
2783 dev_t dev;
2784 rdev0 = list_entry(pending_raid_disks.next,
2785 mdk_rdev_t, same_set);
2786
2787 printk(KERN_INFO "md: considering %s ...\n",
2788 bdevname(rdev0->bdev,b));
2789 INIT_LIST_HEAD(&candidates);
2790 ITERATE_RDEV_PENDING(rdev,tmp)
2791 if (super_90_load(rdev, rdev0, 0) >= 0) {
2792 printk(KERN_INFO "md: adding %s ...\n",
2793 bdevname(rdev->bdev,b));
2794 list_move(&rdev->same_set, &candidates);
2795 }
2796 /*
2797 * now we have a set of devices, with all of them having
2798 * mostly sane superblocks. It's time to allocate the
2799 * mddev.
2800 */
2801 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
2802 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
2803 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
2804 break;
2805 }
2806 if (part)
2807 dev = MKDEV(mdp_major,
2808 rdev0->preferred_minor << MdpMinorShift);
2809 else
2810 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
2811
2812 md_probe(dev, NULL, NULL);
2813 mddev = mddev_find(dev);
2814 if (!mddev) {
2815 printk(KERN_ERR
2816 "md: cannot allocate memory for md drive.\n");
2817 break;
2818 }
2819 if (mddev_lock(mddev))
2820 printk(KERN_WARNING "md: %s locked, cannot run\n",
2821 mdname(mddev));
2822 else if (mddev->raid_disks || mddev->major_version
2823 || !list_empty(&mddev->disks)) {
2824 printk(KERN_WARNING
2825 "md: %s already running, cannot run %s\n",
2826 mdname(mddev), bdevname(rdev0->bdev,b));
2827 mddev_unlock(mddev);
2828 } else {
2829 printk(KERN_INFO "md: created %s\n", mdname(mddev));
2830 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
2831 list_del_init(&rdev->same_set);
2832 if (bind_rdev_to_array(rdev, mddev))
2833 export_rdev(rdev);
2834 }
2835 autorun_array(mddev);
2836 mddev_unlock(mddev);
2837 }
2838 /* on success, candidates will be empty, on error
2839 * it won't...
2840 */
2841 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
2842 export_rdev(rdev);
2843 mddev_put(mddev);
2844 }
2845 printk(KERN_INFO "md: ... autorun DONE.\n");
2846}
2847
2848/*
2849 * import RAID devices based on one partition
2850 * if possible, the array gets run as well.
2851 */
2852
2853static int autostart_array(dev_t startdev)
2854{
2855 char b[BDEVNAME_SIZE];
2856 int err = -EINVAL, i;
2857 mdp_super_t *sb = NULL;
2858 mdk_rdev_t *start_rdev = NULL, *rdev;
2859
2860 start_rdev = md_import_device(startdev, 0, 0);
2861 if (IS_ERR(start_rdev))
2862 return err;
2863
2864
2865 /* NOTE: this can only work for 0.90.0 superblocks */
2866 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
2867 if (sb->major_version != 0 ||
2868 sb->minor_version != 90 ) {
2869 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
2870 export_rdev(start_rdev);
2871 return err;
2872 }
2873
b2d444d7 2874 if (test_bit(Faulty, &start_rdev->flags)) {
1da177e4
LT		 2875 printk(KERN_WARNING
2876 "md: can not autostart based on faulty %s!\n",
2877 bdevname(start_rdev->bdev,b));
2878 export_rdev(start_rdev);
2879 return err;
2880 }
2881 list_add(&start_rdev->same_set, &pending_raid_disks);
2882
2883 for (i = 0; i < MD_SB_DISKS; i++) {
2884 mdp_disk_t *desc = sb->disks + i;
2885 dev_t dev = MKDEV(desc->major, desc->minor);
2886
2887 if (!dev)
2888 continue;
2889 if (dev == startdev)
2890 continue;
2891 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
2892 continue;
2893 rdev = md_import_device(dev, 0, 0);
2894 if (IS_ERR(rdev))
2895 continue;
2896
2897 list_add(&rdev->same_set, &pending_raid_disks);
2898 }
2899
2900 /*
2901 * possibly return codes
2902 */
2903 autorun_devices(0);
2904 return 0;
2905
2906}
2907
2908
2909static int get_version(void __user * arg)
2910{
2911 mdu_version_t ver;
2912
2913 ver.major = MD_MAJOR_VERSION;
2914 ver.minor = MD_MINOR_VERSION;
2915 ver.patchlevel = MD_PATCHLEVEL_VERSION;
2916
2917 if (copy_to_user(arg, &ver, sizeof(ver)))
2918 return -EFAULT;
2919
2920 return 0;
2921}
2922
2923static int get_array_info(mddev_t * mddev, void __user * arg)
2924{
2925 mdu_array_info_t info;
2926 int nr,working,active,failed,spare;
2927 mdk_rdev_t *rdev;
2928 struct list_head *tmp;
2929
2930 nr=working=active=failed=spare=0;
2931 ITERATE_RDEV(mddev,rdev,tmp) {
2932 nr++;
b2d444d7 2933 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2934 failed++;
2935 else {
2936 working++;
b2d444d7 2937 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 2938 active++;
2939 else
2940 spare++;
2941 }
2942 }
2943
2944 info.major_version = mddev->major_version;
2945 info.minor_version = mddev->minor_version;
2946 info.patch_version = MD_PATCHLEVEL_VERSION;
2947 info.ctime = mddev->ctime;
2948 info.level = mddev->level;
2949 info.size = mddev->size;
284ae7ca
N		 2950 if (info.size != mddev->size) /* overflow */
2951 info.size = -1;
1da177e4
LT		 2952 info.nr_disks = nr;
2953 info.raid_disks = mddev->raid_disks;
2954 info.md_minor = mddev->md_minor;
2955 info.not_persistent= !mddev->persistent;
2956
2957 info.utime = mddev->utime;
2958 info.state = 0;
2959 if (mddev->in_sync)
2960 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 2961 if (mddev->bitmap && mddev->bitmap_offset)
2962 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 2963 info.active_disks = active;
2964 info.working_disks = working;
2965 info.failed_disks = failed;
2966 info.spare_disks = spare;
2967
2968 info.layout = mddev->layout;
2969 info.chunk_size = mddev->chunk_size;
2970
2971 if (copy_to_user(arg, &info, sizeof(info)))
2972 return -EFAULT;
2973
2974 return 0;
2975}
2976
87162a28 2977static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 2978{
2979 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
2980 char *ptr, *buf = NULL;
2981 int err = -ENOMEM;
2982
2983 file = kmalloc(sizeof(*file), GFP_KERNEL);
2984 if (!file)
2985 goto out;
2986
2987 /* bitmap disabled, zero the first byte and copy out */
2988 if (!mddev->bitmap || !mddev->bitmap->file) {
2989 file->pathname[0] = '\0';
2990 goto copy_out;
2991 }
2992
2993 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
2994 if (!buf)
2995 goto out;
2996
2997 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
2998 if (!ptr)
2999 goto out;
3000
3001 strcpy(file->pathname, ptr);
3002
3003copy_out:
3004 err = 0;
3005 if (copy_to_user(arg, file, sizeof(*file)))
3006 err = -EFAULT;
3007out:
3008 kfree(buf);
3009 kfree(file);
3010 return err;
3011}
3012
1da177e4
LT		 3013static int get_disk_info(mddev_t * mddev, void __user * arg)
3014{
3015 mdu_disk_info_t info;
3016 unsigned int nr;
3017 mdk_rdev_t *rdev;
3018
3019 if (copy_from_user(&info, arg, sizeof(info)))
3020 return -EFAULT;
3021
3022 nr = info.number;
3023
3024 rdev = find_rdev_nr(mddev, nr);
3025 if (rdev) {
3026 info.major = MAJOR(rdev->bdev->bd_dev);
3027 info.minor = MINOR(rdev->bdev->bd_dev);
3028 info.raid_disk = rdev->raid_disk;
3029 info.state = 0;
b2d444d7 3030 if (test_bit(Faulty, &rdev->flags))
1da177e4 3031 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 3032 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 3033 info.state |= (1<<MD_DISK_ACTIVE);
3034 info.state |= (1<<MD_DISK_SYNC);
3035 }
8ddf9efe
N		 3036 if (test_bit(WriteMostly, &rdev->flags))
3037 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 3038 } else {
3039 info.major = info.minor = 0;
3040 info.raid_disk = -1;
3041 info.state = (1<<MD_DISK_REMOVED);
3042 }
3043
3044 if (copy_to_user(arg, &info, sizeof(info)))
3045 return -EFAULT;
3046
3047 return 0;
3048}
3049
3050static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3051{
3052 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3053 mdk_rdev_t *rdev;
3054 dev_t dev = MKDEV(info->major,info->minor);
3055
3056 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3057 return -EOVERFLOW;
3058
3059 if (!mddev->raid_disks) {
3060 int err;
3061 /* expecting a device which has a superblock */
3062 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3063 if (IS_ERR(rdev)) {
3064 printk(KERN_WARNING
3065 "md: md_import_device returned %ld\n",
3066 PTR_ERR(rdev));
3067 return PTR_ERR(rdev);
3068 }
3069 if (!list_empty(&mddev->disks)) {
3070 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3071 mdk_rdev_t, same_set);
3072 int err = super_types[mddev->major_version]
3073 .load_super(rdev, rdev0, mddev->minor_version);
3074 if (err < 0) {
3075 printk(KERN_WARNING
3076 "md: %s has different UUID to %s\n",
3077 bdevname(rdev->bdev,b),
3078 bdevname(rdev0->bdev,b2));
3079 export_rdev(rdev);
3080 return -EINVAL;
3081 }
3082 }
3083 err = bind_rdev_to_array(rdev, mddev);
3084 if (err)
3085 export_rdev(rdev);
3086 return err;
3087 }
3088
3089 /*
3090 * add_new_disk can be used once the array is assembled
3091 * to add "hot spares". They must already have a superblock
3092 * written
3093 */
3094 if (mddev->pers) {
3095 int err;
3096 if (!mddev->pers->hot_add_disk) {
3097 printk(KERN_WARNING
3098 "%s: personality does not support diskops!\n",
3099 mdname(mddev));
3100 return -EINVAL;
3101 }
7b1e35f6
N		 3102 if (mddev->persistent)
3103 rdev = md_import_device(dev, mddev->major_version,
3104 mddev->minor_version);
3105 else
3106 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 3107 if (IS_ERR(rdev)) {
3108 printk(KERN_WARNING
3109 "md: md_import_device returned %ld\n",
3110 PTR_ERR(rdev));
3111 return PTR_ERR(rdev);
3112 }
41158c7e
N		 3113 /* set save_raid_disk if appropriate */
3114 if (!mddev->persistent) {
3115 if (info->state & (1<<MD_DISK_SYNC) &&
3116 info->raid_disk < mddev->raid_disks)
3117 rdev->raid_disk = info->raid_disk;
3118 else
3119 rdev->raid_disk = -1;
3120 } else
3121 super_types[mddev->major_version].
3122 validate_super(mddev, rdev);
3123 rdev->saved_raid_disk = rdev->raid_disk;
3124
b2d444d7 3125 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 3126 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3127 set_bit(WriteMostly, &rdev->flags);
3128
1da177e4
LT		 3129 rdev->raid_disk = -1;
3130 err = bind_rdev_to_array(rdev, mddev);
3131 if (err)
3132 export_rdev(rdev);
c361777f
N		 3133
3134 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 3135 md_wakeup_thread(mddev->thread);
1da177e4
LT		 3136 return err;
3137 }
3138
3139 /* otherwise, add_new_disk is only allowed
3140 * for major_version==0 superblocks
3141 */
3142 if (mddev->major_version != 0) {
3143 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3144 mdname(mddev));
3145 return -EINVAL;
3146 }
3147
3148 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3149 int err;
3150 rdev = md_import_device (dev, -1, 0);
3151 if (IS_ERR(rdev)) {
3152 printk(KERN_WARNING
3153 "md: error, md_import_device() returned %ld\n",
3154 PTR_ERR(rdev));
3155 return PTR_ERR(rdev);
3156 }
3157 rdev->desc_nr = info->number;
3158 if (info->raid_disk < mddev->raid_disks)
3159 rdev->raid_disk = info->raid_disk;
3160 else
3161 rdev->raid_disk = -1;
3162
b2d444d7
N		 3163 rdev->flags = 0;
3164
1da177e4 3165 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 3166 if (info->state & (1<<MD_DISK_SYNC))
3167 set_bit(In_sync, &rdev->flags);
1da177e4 3168
8ddf9efe
N		 3169 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3170 set_bit(WriteMostly, &rdev->flags);
3171
1da177e4
LT		 3172 if (!mddev->persistent) {
3173 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3174 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3175 } else
3176 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3177 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3178
2bf071bf
N		 3179 err = bind_rdev_to_array(rdev, mddev);
3180 if (err) {
3181 export_rdev(rdev);
3182 return err;
3183 }
1da177e4
LT		 3184 }
3185
3186 return 0;
3187}
3188
3189static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3190{
3191 char b[BDEVNAME_SIZE];
3192 mdk_rdev_t *rdev;
3193
3194 if (!mddev->pers)
3195 return -ENODEV;
3196
3197 rdev = find_rdev(mddev, dev);
3198 if (!rdev)
3199 return -ENXIO;
3200
3201 if (rdev->raid_disk >= 0)
3202 goto busy;
3203
3204 kick_rdev_from_array(rdev);
3205 md_update_sb(mddev);
d7603b7e 3206 md_new_event(mddev);
1da177e4
LT		 3207
3208 return 0;
3209busy:
3210 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3211 bdevname(rdev->bdev,b), mdname(mddev));
3212 return -EBUSY;
3213}
3214
3215static int hot_add_disk(mddev_t * mddev, dev_t dev)
3216{
3217 char b[BDEVNAME_SIZE];
3218 int err;
3219 unsigned int size;
3220 mdk_rdev_t *rdev;
3221
3222 if (!mddev->pers)
3223 return -ENODEV;
3224
3225 if (mddev->major_version != 0) {
3226 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3227 " version-0 superblocks.\n",
3228 mdname(mddev));
3229 return -EINVAL;
3230 }
3231 if (!mddev->pers->hot_add_disk) {
3232 printk(KERN_WARNING
3233 "%s: personality does not support diskops!\n",
3234 mdname(mddev));
3235 return -EINVAL;
3236 }
3237
3238 rdev = md_import_device (dev, -1, 0);
3239 if (IS_ERR(rdev)) {
3240 printk(KERN_WARNING
3241 "md: error, md_import_device() returned %ld\n",
3242 PTR_ERR(rdev));
3243 return -EINVAL;
3244 }
3245
3246 if (mddev->persistent)
3247 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3248 else
3249 rdev->sb_offset =
3250 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3251
3252 size = calc_dev_size(rdev, mddev->chunk_size);
3253 rdev->size = size;
3254
b2d444d7 3255 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 3256 printk(KERN_WARNING
3257 "md: can not hot-add faulty %s disk to %s!\n",
3258 bdevname(rdev->bdev,b), mdname(mddev));
3259 err = -EINVAL;
3260 goto abort_export;
3261 }
b2d444d7 3262 clear_bit(In_sync, &rdev->flags);
1da177e4 3263 rdev->desc_nr = -1;
2bf071bf
N		 3264 err = bind_rdev_to_array(rdev, mddev);
3265 if (err)
3266 goto abort_export;
1da177e4
LT		 3267
3268 /*
3269 * The rest should better be atomic, we can have disk failures
3270 * noticed in interrupt contexts ...
3271 */
3272
3273 if (rdev->desc_nr == mddev->max_disks) {
3274 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
3275 mdname(mddev));
3276 err = -EBUSY;
3277 goto abort_unbind_export;
3278 }
3279
3280 rdev->raid_disk = -1;
3281
3282 md_update_sb(mddev);
3283
3284 /*
3285 * Kick recovery, maybe this spare has to be added to the
3286 * array immediately.
3287 */
3288 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3289 md_wakeup_thread(mddev->thread);
d7603b7e 3290 md_new_event(mddev);
1da177e4
LT		 3291 return 0;
3292
3293abort_unbind_export:
3294 unbind_rdev_from_array(rdev);
3295
3296abort_export:
3297 export_rdev(rdev);
3298 return err;
3299}
3300
32a7627c
N		 3301/* similar to deny_write_access, but accounts for our holding a reference
3302 * to the file ourselves */
3303static int deny_bitmap_write_access(struct file * file)
3304{
3305 struct inode *inode = file->f_mapping->host;
3306
3307 spin_lock(&inode->i_lock);
3308 if (atomic_read(&inode->i_writecount) > 1) {
3309 spin_unlock(&inode->i_lock);
3310 return -ETXTBSY;
3311 }
3312 atomic_set(&inode->i_writecount, -1);
3313 spin_unlock(&inode->i_lock);
3314
3315 return 0;
3316}
3317
3318static int set_bitmap_file(mddev_t *mddev, int fd)
3319{
3320 int err;
3321
36fa3063
N		 3322 if (mddev->pers) {
3323 if (!mddev->pers->quiesce)
3324 return -EBUSY;
3325 if (mddev->recovery || mddev->sync_thread)
3326 return -EBUSY;
3327 /* we should be able to change the bitmap.. */
3328 }
32a7627c 3329
32a7627c 3330
36fa3063
N		 3331 if (fd >= 0) {
3332 if (mddev->bitmap)
3333 return -EEXIST; /* cannot add when bitmap is present */
3334 mddev->bitmap_file = fget(fd);
32a7627c 3335
36fa3063
N		 3336 if (mddev->bitmap_file == NULL) {
3337 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
3338 mdname(mddev));
3339 return -EBADF;
3340 }
3341
3342 err = deny_bitmap_write_access(mddev->bitmap_file);
3343 if (err) {
3344 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
3345 mdname(mddev));
3346 fput(mddev->bitmap_file);
3347 mddev->bitmap_file = NULL;
3348 return err;
3349 }
a654b9d8 3350 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 3351 } else if (mddev->bitmap == NULL)
3352 return -ENOENT; /* cannot remove what isn't there */
3353 err = 0;
3354 if (mddev->pers) {
3355 mddev->pers->quiesce(mddev, 1);
3356 if (fd >= 0)
3357 err = bitmap_create(mddev);
3358 if (fd < 0 || err)
3359 bitmap_destroy(mddev);
3360 mddev->pers->quiesce(mddev, 0);
3361 } else if (fd < 0) {
3362 if (mddev->bitmap_file)
3363 fput(mddev->bitmap_file);
3364 mddev->bitmap_file = NULL;
3365 }
3366
32a7627c
N		 3367 return err;
3368}
3369
1da177e4
LT		 3370/*
3371 * set_array_info is used two different ways
3372 * The original usage is when creating a new array.
3373 * In this usage, raid_disks is > 0 and it together with
3374 * level, size, not_persistent,layout,chunksize determine the
3375 * shape of the array.
3376 * This will always create an array with a type-0.90.0 superblock.
3377 * The newer usage is when assembling an array.
3378 * In this case raid_disks will be 0, and the major_version field is
3379 * use to determine which style super-blocks are to be found on the devices.
3380 * The minor and patch _version numbers are also kept incase the
3381 * super_block handler wishes to interpret them.
3382 */
3383static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
3384{
3385
3386 if (info->raid_disks == 0) {
3387 /* just setting version number for superblock loading */
3388 if (info->major_version < 0 ||
3389 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
3390 super_types[info->major_version].name == NULL) {
3391 /* maybe try to auto-load a module? */
3392 printk(KERN_INFO
3393 "md: superblock version %d not known\n",
3394 info->major_version);
3395 return -EINVAL;
3396 }
3397 mddev->major_version = info->major_version;
3398 mddev->minor_version = info->minor_version;
3399 mddev->patch_version = info->patch_version;
3400 return 0;
3401 }
3402 mddev->major_version = MD_MAJOR_VERSION;
3403 mddev->minor_version = MD_MINOR_VERSION;
3404 mddev->patch_version = MD_PATCHLEVEL_VERSION;
3405 mddev->ctime = get_seconds();
3406
3407 mddev->level = info->level;
17115e03 3408 mddev->clevel[0] = 0;
1da177e4
LT		 3409 mddev->size = info->size;
3410 mddev->raid_disks = info->raid_disks;
3411 /* don't set md_minor, it is determined by which /dev/md* was
3412 * openned
3413 */
3414 if (info->state & (1<<MD_SB_CLEAN))
3415 mddev->recovery_cp = MaxSector;
3416 else
3417 mddev->recovery_cp = 0;
3418 mddev->persistent = ! info->not_persistent;
3419
3420 mddev->layout = info->layout;
3421 mddev->chunk_size = info->chunk_size;
3422
3423 mddev->max_disks = MD_SB_DISKS;
3424
3425 mddev->sb_dirty = 1;
3426
b2a2703c
N		 3427 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
3428 mddev->bitmap_offset = 0;
3429
1da177e4
LT		 3430 /*
3431 * Generate a 128 bit UUID
3432 */
3433 get_random_bytes(mddev->uuid, 16);
3434
3435 return 0;
3436}
3437
a35b0d69
N		 3438static int update_size(mddev_t *mddev, unsigned long size)
3439{
3440 mdk_rdev_t * rdev;
3441 int rv;
3442 struct list_head *tmp;
3443
3444 if (mddev->pers->resize == NULL)
3445 return -EINVAL;
3446 /* The "size" is the amount of each device that is used.
3447 * This can only make sense for arrays with redundancy.
3448 * linear and raid0 always use whatever space is available
3449 * We can only consider changing the size if no resync
3450 * or reconstruction is happening, and if the new size
3451 * is acceptable. It must fit before the sb_offset or,
3452 * if that is <data_offset, it must fit before the
3453 * size of each device.
3454 * If size is zero, we find the largest size that fits.
3455 */
3456 if (mddev->sync_thread)
3457 return -EBUSY;
3458 ITERATE_RDEV(mddev,rdev,tmp) {
3459 sector_t avail;
3460 int fit = (size == 0);
3461 if (rdev->sb_offset > rdev->data_offset)
3462 avail = (rdev->sb_offset*2) - rdev->data_offset;
3463 else
3464 avail = get_capacity(rdev->bdev->bd_disk)
3465 - rdev->data_offset;
3466 if (fit && (size == 0 || size > avail/2))
3467 size = avail/2;
3468 if (avail < ((sector_t)size << 1))
3469 return -ENOSPC;
3470 }
3471 rv = mddev->pers->resize(mddev, (sector_t)size *2);
3472 if (!rv) {
3473 struct block_device *bdev;
3474
3475 bdev = bdget_disk(mddev->gendisk, 0);
3476 if (bdev) {
1b1dcc1b 3477 mutex_lock(&bdev->bd_inode->i_mutex);
6d89332b 3478 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
1b1dcc1b 3479 mutex_unlock(&bdev->bd_inode->i_mutex);
a35b0d69
N		 3480 bdput(bdev);
3481 }
3482 }
3483 return rv;
3484}
3485
da943b99
N		 3486static int update_raid_disks(mddev_t *mddev, int raid_disks)
3487{
3488 int rv;
3489 /* change the number of raid disks */
3490 if (mddev->pers->reshape == NULL)
3491 return -EINVAL;
3492 if (raid_disks <= 0 ||
3493 raid_disks >= mddev->max_disks)
3494 return -EINVAL;
3495 if (mddev->sync_thread)
3496 return -EBUSY;
3497 rv = mddev->pers->reshape(mddev, raid_disks);
da943b99
N		 3498 return rv;
3499}
3500
3501
1da177e4
LT		 3502/*
3503 * update_array_info is used to change the configuration of an
3504 * on-line array.
3505 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
3506 * fields in the info are checked against the array.
3507 * Any differences that cannot be handled will cause an error.
3508 * Normally, only one change can be managed at a time.
3509 */
3510static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
3511{
3512 int rv = 0;
3513 int cnt = 0;
36fa3063
N		 3514 int state = 0;
3515
3516 /* calculate expected state,ignoring low bits */
3517 if (mddev->bitmap && mddev->bitmap_offset)
3518 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 3519
3520 if (mddev->major_version != info->major_version ||
3521 mddev->minor_version != info->minor_version ||
3522/* mddev->patch_version != info->patch_version || */
3523 mddev->ctime != info->ctime ||
3524 mddev->level != info->level ||
3525/* mddev->layout != info->layout || */
3526 !mddev->persistent != info->not_persistent||
36fa3063
N		 3527 mddev->chunk_size != info->chunk_size ||
3528 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
3529 ((state^info->state) & 0xfffffe00)
3530 )
1da177e4
LT		 3531 return -EINVAL;
3532 /* Check there is only one change */
284ae7ca 3533 if (info->size >= 0 && mddev->size != info->size) cnt++;
1da177e4
LT		 3534 if (mddev->raid_disks != info->raid_disks) cnt++;
3535 if (mddev->layout != info->layout) cnt++;
36fa3063 3536 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 3537 if (cnt == 0) return 0;
3538 if (cnt > 1) return -EINVAL;
3539
3540 if (mddev->layout != info->layout) {
3541 /* Change layout
3542 * we don't need to do anything at the md level, the
3543 * personality will take care of it all.
3544 */
3545 if (mddev->pers->reconfig == NULL)
3546 return -EINVAL;
3547 else
3548 return mddev->pers->reconfig(mddev, info->layout, -1);
3549 }
284ae7ca 3550 if (info->size >= 0 && mddev->size != info->size)
a35b0d69
N		 3551 rv = update_size(mddev, info->size);
3552
da943b99
N		 3553 if (mddev->raid_disks != info->raid_disks)
3554 rv = update_raid_disks(mddev, info->raid_disks);
3555
36fa3063
N		 3556 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
3557 if (mddev->pers->quiesce == NULL)
3558 return -EINVAL;
3559 if (mddev->recovery || mddev->sync_thread)
3560 return -EBUSY;
3561 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
3562 /* add the bitmap */
3563 if (mddev->bitmap)
3564 return -EEXIST;
3565 if (mddev->default_bitmap_offset == 0)
3566 return -EINVAL;
3567 mddev->bitmap_offset = mddev->default_bitmap_offset;
3568 mddev->pers->quiesce(mddev, 1);
3569 rv = bitmap_create(mddev);
3570 if (rv)
3571 bitmap_destroy(mddev);
3572 mddev->pers->quiesce(mddev, 0);
3573 } else {
3574 /* remove the bitmap */
3575 if (!mddev->bitmap)
3576 return -ENOENT;
3577 if (mddev->bitmap->file)
3578 return -EINVAL;
3579 mddev->pers->quiesce(mddev, 1);
3580 bitmap_destroy(mddev);
3581 mddev->pers->quiesce(mddev, 0);
3582 mddev->bitmap_offset = 0;
3583 }
3584 }
1da177e4
LT		 3585 md_update_sb(mddev);
3586 return rv;
3587}
3588
3589static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3590{
3591 mdk_rdev_t *rdev;
3592
3593 if (mddev->pers == NULL)
3594 return -ENODEV;
3595
3596 rdev = find_rdev(mddev, dev);
3597 if (!rdev)
3598 return -ENODEV;
3599
3600 md_error(mddev, rdev);
3601 return 0;
3602}
3603
a885c8c4
CH		 3604static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3605{
3606 mddev_t *mddev = bdev->bd_disk->private_data;
3607
3608 geo->heads = 2;
3609 geo->sectors = 4;
3610 geo->cylinders = get_capacity(mddev->gendisk) / 8;
3611 return 0;
3612}
3613
1da177e4
LT		 3614static int md_ioctl(struct inode *inode, struct file *file,
3615 unsigned int cmd, unsigned long arg)
3616{
3617 int err = 0;
3618 void __user *argp = (void __user *)arg;
1da177e4
LT		 3619 mddev_t *mddev = NULL;
3620
3621 if (!capable(CAP_SYS_ADMIN))
3622 return -EACCES;
3623
3624 /*
3625 * Commands dealing with the RAID driver but not any
3626 * particular array:
3627 */
3628 switch (cmd)
3629 {
3630 case RAID_VERSION:
3631 err = get_version(argp);
3632 goto done;
3633
3634 case PRINT_RAID_DEBUG:
3635 err = 0;
3636 md_print_devices();
3637 goto done;
3638
3639#ifndef MODULE
3640 case RAID_AUTORUN:
3641 err = 0;
3642 autostart_arrays(arg);
3643 goto done;
3644#endif
3645 default:;
3646 }
3647
3648 /*
3649 * Commands creating/starting a new array:
3650 */
3651
3652 mddev = inode->i_bdev->bd_disk->private_data;
3653
3654 if (!mddev) {
3655 BUG();
3656 goto abort;
3657 }
3658
3659
3660 if (cmd == START_ARRAY) {
3661 /* START_ARRAY doesn't need to lock the array as autostart_array
3662 * does the locking, and it could even be a different array
3663 */
3664 static int cnt = 3;
3665 if (cnt > 0 ) {
3666 printk(KERN_WARNING
3667 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
e8a00334 3668 "This will not be supported beyond July 2006\n",
1da177e4
LT		 3669 current->comm, current->pid);
3670 cnt--;
3671 }
3672 err = autostart_array(new_decode_dev(arg));
3673 if (err) {
3674 printk(KERN_WARNING "md: autostart failed!\n");
3675 goto abort;
3676 }
3677 goto done;
3678 }
3679
3680 err = mddev_lock(mddev);
3681 if (err) {
3682 printk(KERN_INFO
3683 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3684 err, cmd);
3685 goto abort;
3686 }
3687
3688 switch (cmd)
3689 {
3690 case SET_ARRAY_INFO:
3691 {
3692 mdu_array_info_t info;
3693 if (!arg)
3694 memset(&info, 0, sizeof(info));
3695 else if (copy_from_user(&info, argp, sizeof(info))) {
3696 err = -EFAULT;
3697 goto abort_unlock;
3698 }
3699 if (mddev->pers) {
3700 err = update_array_info(mddev, &info);
3701 if (err) {
3702 printk(KERN_WARNING "md: couldn't update"
3703 " array info. %d\n", err);
3704 goto abort_unlock;
3705 }
3706 goto done_unlock;
3707 }
3708 if (!list_empty(&mddev->disks)) {
3709 printk(KERN_WARNING
3710 "md: array %s already has disks!\n",
3711 mdname(mddev));
3712 err = -EBUSY;
3713 goto abort_unlock;
3714 }
3715 if (mddev->raid_disks) {
3716 printk(KERN_WARNING
3717 "md: array %s already initialised!\n",
3718 mdname(mddev));
3719 err = -EBUSY;
3720 goto abort_unlock;
3721 }
3722 err = set_array_info(mddev, &info);
3723 if (err) {
3724 printk(KERN_WARNING "md: couldn't set"
3725 " array info. %d\n", err);
3726 goto abort_unlock;
3727 }
3728 }
3729 goto done_unlock;
3730
3731 default:;
3732 }
3733
3734 /*
3735 * Commands querying/configuring an existing array:
3736 */
32a7627c
N		 3737 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3738 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3739 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3740 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
1da177e4
LT		 3741 err = -ENODEV;
3742 goto abort_unlock;
3743 }
3744
3745 /*
3746 * Commands even a read-only array can execute:
3747 */
3748 switch (cmd)
3749 {
3750 case GET_ARRAY_INFO:
3751 err = get_array_info(mddev, argp);
3752 goto done_unlock;
3753
32a7627c 3754 case GET_BITMAP_FILE:
87162a28 3755 err = get_bitmap_file(mddev, argp);
32a7627c
N		 3756 goto done_unlock;
3757
1da177e4
LT		 3758 case GET_DISK_INFO:
3759 err = get_disk_info(mddev, argp);
3760 goto done_unlock;
3761
3762 case RESTART_ARRAY_RW:
3763 err = restart_array(mddev);
3764 goto done_unlock;
3765
3766 case STOP_ARRAY:
3767 err = do_md_stop (mddev, 0);
3768 goto done_unlock;
3769
3770 case STOP_ARRAY_RO:
3771 err = do_md_stop (mddev, 1);
3772 goto done_unlock;
3773
3774 /*
3775 * We have a problem here : there is no easy way to give a CHS
3776 * virtual geometry. We currently pretend that we have a 2 heads
3777 * 4 sectors (with a BIG number of cylinders...). This drives
3778 * dosfs just mad... ;-)
3779 */
1da177e4
LT		 3780 }
3781
3782 /*
3783 * The remaining ioctls are changing the state of the
f91de92e
N		 3784 * superblock, so we do not allow them on read-only arrays.
3785 * However non-MD ioctls (e.g. get-size) will still come through
3786 * here and hit the 'default' below, so only disallow
3787 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 3788 */
f91de92e
N		 3789 if (_IOC_TYPE(cmd) == MD_MAJOR &&
3790 mddev->ro && mddev->pers) {
3791 if (mddev->ro == 2) {
3792 mddev->ro = 0;
3793 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3794 md_wakeup_thread(mddev->thread);
3795
3796 } else {
3797 err = -EROFS;
3798 goto abort_unlock;
3799 }
1da177e4
LT		 3800 }
3801
3802 switch (cmd)
3803 {
3804 case ADD_NEW_DISK:
3805 {
3806 mdu_disk_info_t info;
3807 if (copy_from_user(&info, argp, sizeof(info)))
3808 err = -EFAULT;
3809 else
3810 err = add_new_disk(mddev, &info);
3811 goto done_unlock;
3812 }
3813
3814 case HOT_REMOVE_DISK:
3815 err = hot_remove_disk(mddev, new_decode_dev(arg));
3816 goto done_unlock;
3817
3818 case HOT_ADD_DISK:
3819 err = hot_add_disk(mddev, new_decode_dev(arg));
3820 goto done_unlock;
3821
3822 case SET_DISK_FAULTY:
3823 err = set_disk_faulty(mddev, new_decode_dev(arg));
3824 goto done_unlock;
3825
3826 case RUN_ARRAY:
3827 err = do_md_run (mddev);
3828 goto done_unlock;
3829
32a7627c
N		 3830 case SET_BITMAP_FILE:
3831 err = set_bitmap_file(mddev, (int)arg);
3832 goto done_unlock;
3833
1da177e4
LT		 3834 default:
3835 if (_IOC_TYPE(cmd) == MD_MAJOR)
3836 printk(KERN_WARNING "md: %s(pid %d) used"
3837 " obsolete MD ioctl, upgrade your"
3838 " software to use new ictls.\n",
3839 current->comm, current->pid);
3840 err = -EINVAL;
3841 goto abort_unlock;
3842 }
3843
3844done_unlock:
3845abort_unlock:
3846 mddev_unlock(mddev);
3847
3848 return err;
3849done:
3850 if (err)
3851 MD_BUG();
3852abort:
3853 return err;
3854}
3855
3856static int md_open(struct inode *inode, struct file *file)
3857{
3858 /*
3859 * Succeed if we can lock the mddev, which confirms that
3860 * it isn't being stopped right now.
3861 */
3862 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3863 int err;
3864
3865 if ((err = mddev_lock(mddev)))
3866 goto out;
3867
3868 err = 0;
3869 mddev_get(mddev);
3870 mddev_unlock(mddev);
3871
3872 check_disk_change(inode->i_bdev);
3873 out:
3874 return err;
3875}
3876
3877static int md_release(struct inode *inode, struct file * file)
3878{
3879 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3880
3881 if (!mddev)
3882 BUG();
3883 mddev_put(mddev);
3884
3885 return 0;
3886}
3887
3888static int md_media_changed(struct gendisk *disk)
3889{
3890 mddev_t *mddev = disk->private_data;
3891
3892 return mddev->changed;
3893}
3894
3895static int md_revalidate(struct gendisk *disk)
3896{
3897 mddev_t *mddev = disk->private_data;
3898
3899 mddev->changed = 0;
3900 return 0;
3901}
3902static struct block_device_operations md_fops =
3903{
3904 .owner = THIS_MODULE,
3905 .open = md_open,
3906 .release = md_release,
3907 .ioctl = md_ioctl,
a885c8c4 3908 .getgeo = md_getgeo,
1da177e4
LT		 3909 .media_changed = md_media_changed,
3910 .revalidate_disk= md_revalidate,
3911};
3912
75c96f85 3913static int md_thread(void * arg)
1da177e4
LT		 3914{
3915 mdk_thread_t *thread = arg;
3916
1da177e4
LT		 3917 /*
3918 * md_thread is a 'system-thread', it's priority should be very
3919 * high. We avoid resource deadlocks individually in each
3920 * raid personality. (RAID5 does preallocation) We also use RR and
3921 * the very same RT priority as kswapd, thus we will never get
3922 * into a priority inversion deadlock.
3923 *
3924 * we definitely have to have equal or higher priority than
3925 * bdflush, otherwise bdflush will deadlock if there are too
3926 * many dirty RAID5 blocks.
3927 */
1da177e4 3928
6985c43f 3929 allow_signal(SIGKILL);
a6fb0934 3930 while (!kthread_should_stop()) {
1da177e4 3931
93588e22
N		 3932 /* We need to wait INTERRUPTIBLE so that
3933 * we don't add to the load-average.
3934 * That means we need to be sure no signals are
3935 * pending
3936 */
3937 if (signal_pending(current))
3938 flush_signals(current);
3939
3940 wait_event_interruptible_timeout
3941 (thread->wqueue,
3942 test_bit(THREAD_WAKEUP, &thread->flags)
3943 || kthread_should_stop(),
3944 thread->timeout);
3e1d1d28 3945 try_to_freeze();
1da177e4
LT		 3946
3947 clear_bit(THREAD_WAKEUP, &thread->flags);
3948
787453c2 3949 thread->run(thread->mddev);
1da177e4 3950 }
a6fb0934 3951
1da177e4
LT		 3952 return 0;
3953}
3954
3955void md_wakeup_thread(mdk_thread_t *thread)
3956{
3957 if (thread) {
3958 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
3959 set_bit(THREAD_WAKEUP, &thread->flags);
3960 wake_up(&thread->wqueue);
3961 }
3962}
3963
3964mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
3965 const char *name)
3966{
3967 mdk_thread_t *thread;
1da177e4 3968
9ffae0cf 3969 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 3970 if (!thread)
3971 return NULL;
3972
1da177e4
LT		 3973 init_waitqueue_head(&thread->wqueue);
3974
1da177e4
LT		 3975 thread->run = run;
3976 thread->mddev = mddev;
32a7627c 3977 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 3978 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 3979 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 3980 kfree(thread);
3981 return NULL;
3982 }
1da177e4
LT		 3983 return thread;
3984}
3985
1da177e4
LT		 3986void md_unregister_thread(mdk_thread_t *thread)
3987{
d28446fe 3988 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
a6fb0934
N		 3989
3990 kthread_stop(thread->tsk);
1da177e4
LT		 3991 kfree(thread);
3992}
3993
3994void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
3995{
3996 if (!mddev) {
3997 MD_BUG();
3998 return;
3999 }
4000
b2d444d7 4001 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 4002 return;
32a7627c 4003/*
1da177e4
LT		 4004 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4005 mdname(mddev),
4006 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4007 __builtin_return_address(0),__builtin_return_address(1),
4008 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 4009*/
1da177e4
LT		 4010 if (!mddev->pers->error_handler)
4011 return;
4012 mddev->pers->error_handler(mddev,rdev);
4013 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4014 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4015 md_wakeup_thread(mddev->thread);
d7603b7e 4016 md_new_event(mddev);
1da177e4
LT		 4017}
4018
4019/* seq_file implementation /proc/mdstat */
4020
4021static void status_unused(struct seq_file *seq)
4022{
4023 int i = 0;
4024 mdk_rdev_t *rdev;
4025 struct list_head *tmp;
4026
4027 seq_printf(seq, "unused devices: ");
4028
4029 ITERATE_RDEV_PENDING(rdev,tmp) {
4030 char b[BDEVNAME_SIZE];
4031 i++;
4032 seq_printf(seq, "%s ",
4033 bdevname(rdev->bdev,b));
4034 }
4035 if (!i)
4036 seq_printf(seq, "<none>");
4037
4038 seq_printf(seq, "\n");
4039}
4040
4041
4042static void status_resync(struct seq_file *seq, mddev_t * mddev)
4043{
4044 unsigned long max_blocks, resync, res, dt, db, rt;
4045
4046 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4047
4048 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4049 max_blocks = mddev->resync_max_sectors >> 1;
4050 else
4051 max_blocks = mddev->size;
4052
4053 /*
4054 * Should not happen.
4055 */
4056 if (!max_blocks) {
4057 MD_BUG();
4058 return;
4059 }
4060 res = (resync/1024)*1000/(max_blocks/1024 + 1);
4061 {
4062 int i, x = res/50, y = 20-x;
4063 seq_printf(seq, "[");
4064 for (i = 0; i < x; i++)
4065 seq_printf(seq, "=");
4066 seq_printf(seq, ">");
4067 for (i = 0; i < y; i++)
4068 seq_printf(seq, ".");
4069 seq_printf(seq, "] ");
4070 }
4071 seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)",
4072 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4073 "resync" : "recovery"),
4074 res/10, res % 10, resync, max_blocks);
4075
4076 /*
4077 * We do not want to overflow, so the order of operands and
4078 * the * 100 / 100 trick are important. We do a +1 to be
4079 * safe against division by zero. We only estimate anyway.
4080 *
4081 * dt: time from mark until now
4082 * db: blocks written from mark until now
4083 * rt: remaining time
4084 */
4085 dt = ((jiffies - mddev->resync_mark) / HZ);
4086 if (!dt) dt++;
4087 db = resync - (mddev->resync_mark_cnt/2);
4088 rt = (dt * ((max_blocks-resync) / (db/100+1)))/100;
4089
4090 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4091
4092 seq_printf(seq, " speed=%ldK/sec", db/dt);
4093}
4094
4095static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4096{
4097 struct list_head *tmp;
4098 loff_t l = *pos;
4099 mddev_t *mddev;
4100
4101 if (l >= 0x10000)
4102 return NULL;
4103 if (!l--)
4104 /* header */
4105 return (void*)1;
4106
4107 spin_lock(&all_mddevs_lock);
4108 list_for_each(tmp,&all_mddevs)
4109 if (!l--) {
4110 mddev = list_entry(tmp, mddev_t, all_mddevs);
4111 mddev_get(mddev);
4112 spin_unlock(&all_mddevs_lock);
4113 return mddev;
4114 }
4115 spin_unlock(&all_mddevs_lock);
4116 if (!l--)
4117 return (void*)2;/* tail */
4118 return NULL;
4119}
4120
4121static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4122{
4123 struct list_head *tmp;
4124 mddev_t *next_mddev, *mddev = v;
4125
4126 ++*pos;
4127 if (v == (void*)2)
4128 return NULL;
4129
4130 spin_lock(&all_mddevs_lock);
4131 if (v == (void*)1)
4132 tmp = all_mddevs.next;
4133 else
4134 tmp = mddev->all_mddevs.next;
4135 if (tmp != &all_mddevs)
4136 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4137 else {
4138 next_mddev = (void*)2;
4139 *pos = 0x10000;
4140 }
4141 spin_unlock(&all_mddevs_lock);
4142
4143 if (v != (void*)1)
4144 mddev_put(mddev);
4145 return next_mddev;
4146
4147}
4148
4149static void md_seq_stop(struct seq_file *seq, void *v)
4150{
4151 mddev_t *mddev = v;
4152
4153 if (mddev && v != (void*)1 && v != (void*)2)
4154 mddev_put(mddev);
4155}
4156
d7603b7e
N		 4157struct mdstat_info {
4158 int event;
4159};
4160
1da177e4
LT		 4161static int md_seq_show(struct seq_file *seq, void *v)
4162{
4163 mddev_t *mddev = v;
4164 sector_t size;
4165 struct list_head *tmp2;
4166 mdk_rdev_t *rdev;
d7603b7e 4167 struct mdstat_info *mi = seq->private;
32a7627c 4168 struct bitmap *bitmap;
1da177e4
LT		 4169
4170 if (v == (void*)1) {
2604b703 4171 struct mdk_personality *pers;
1da177e4
LT		 4172 seq_printf(seq, "Personalities : ");
4173 spin_lock(&pers_lock);
2604b703
N		 4174 list_for_each_entry(pers, &pers_list, list)
4175 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT		 4176
4177 spin_unlock(&pers_lock);
4178 seq_printf(seq, "\n");
d7603b7e 4179 mi->event = atomic_read(&md_event_count);
1da177e4
LT		 4180 return 0;
4181 }
4182 if (v == (void*)2) {
4183 status_unused(seq);
4184 return 0;
4185 }
4186
4187 if (mddev_lock(mddev)!=0)
4188 return -EINTR;
4189 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4190 seq_printf(seq, "%s : %sactive", mdname(mddev),
4191 mddev->pers ? "" : "in");
4192 if (mddev->pers) {
f91de92e 4193 if (mddev->ro==1)
1da177e4 4194 seq_printf(seq, " (read-only)");
f91de92e
N		 4195 if (mddev->ro==2)
4196 seq_printf(seq, "(auto-read-only)");
1da177e4
LT		 4197 seq_printf(seq, " %s", mddev->pers->name);
4198 }
4199
4200 size = 0;
4201 ITERATE_RDEV(mddev,rdev,tmp2) {
4202 char b[BDEVNAME_SIZE];
4203 seq_printf(seq, " %s[%d]",
4204 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 4205 if (test_bit(WriteMostly, &rdev->flags))
4206 seq_printf(seq, "(W)");
b2d444d7 4207 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4208 seq_printf(seq, "(F)");
4209 continue;
b325a32e
N		 4210 } else if (rdev->raid_disk < 0)
4211 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 4212 size += rdev->size;
4213 }
4214
4215 if (!list_empty(&mddev->disks)) {
4216 if (mddev->pers)
4217 seq_printf(seq, "\n %llu blocks",
4218 (unsigned long long)mddev->array_size);
4219 else
4220 seq_printf(seq, "\n %llu blocks",
4221 (unsigned long long)size);
4222 }
1cd6bf19
N		 4223 if (mddev->persistent) {
4224 if (mddev->major_version != 0 ||
4225 mddev->minor_version != 90) {
4226 seq_printf(seq," super %d.%d",
4227 mddev->major_version,
4228 mddev->minor_version);
4229 }
4230 } else
4231 seq_printf(seq, " super non-persistent");
1da177e4
LT		 4232
4233 if (mddev->pers) {
4234 mddev->pers->status (seq, mddev);
4235 seq_printf(seq, "\n ");
8e1b39d6
N		 4236 if (mddev->pers->sync_request) {
4237 if (mddev->curr_resync > 2) {
4238 status_resync (seq, mddev);
4239 seq_printf(seq, "\n ");
4240 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4241 seq_printf(seq, "\tresync=DELAYED\n ");
4242 else if (mddev->recovery_cp < MaxSector)
4243 seq_printf(seq, "\tresync=PENDING\n ");
4244 }
32a7627c
N		 4245 } else
4246 seq_printf(seq, "\n ");
4247
4248 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 4249 unsigned long chunk_kb;
4250 unsigned long flags;
32a7627c
N		 4251 spin_lock_irqsave(&bitmap->lock, flags);
4252 chunk_kb = bitmap->chunksize >> 10;
4253 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
4254 "%lu%s chunk",
4255 bitmap->pages - bitmap->missing_pages,
4256 bitmap->pages,
4257 (bitmap->pages - bitmap->missing_pages)
4258 << (PAGE_SHIFT - 10),
4259 chunk_kb ? chunk_kb : bitmap->chunksize,
4260 chunk_kb ? "KB" : "B");
78d742d8
N		 4261 if (bitmap->file) {
4262 seq_printf(seq, ", file: ");
4263 seq_path(seq, bitmap->file->f_vfsmnt,
4264 bitmap->file->f_dentry," \t\n");
32a7627c 4265 }
78d742d8 4266
32a7627c
N		 4267 seq_printf(seq, "\n");
4268 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 4269 }
4270
4271 seq_printf(seq, "\n");
4272 }
4273 mddev_unlock(mddev);
4274
4275 return 0;
4276}
4277
4278static struct seq_operations md_seq_ops = {
4279 .start = md_seq_start,
4280 .next = md_seq_next,
4281 .stop = md_seq_stop,
4282 .show = md_seq_show,
4283};
4284
4285static int md_seq_open(struct inode *inode, struct file *file)
4286{
4287 int error;
d7603b7e
N		 4288 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
4289 if (mi == NULL)
4290 return -ENOMEM;
1da177e4
LT		 4291
4292 error = seq_open(file, &md_seq_ops);
d7603b7e
N		 4293 if (error)
4294 kfree(mi);
4295 else {
4296 struct seq_file *p = file->private_data;
4297 p->private = mi;
4298 mi->event = atomic_read(&md_event_count);
4299 }
1da177e4
LT		 4300 return error;
4301}
4302
d7603b7e
N		 4303static int md_seq_release(struct inode *inode, struct file *file)
4304{
4305 struct seq_file *m = file->private_data;
4306 struct mdstat_info *mi = m->private;
4307 m->private = NULL;
4308 kfree(mi);
4309 return seq_release(inode, file);
4310}
4311
4312static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
4313{
4314 struct seq_file *m = filp->private_data;
4315 struct mdstat_info *mi = m->private;
4316 int mask;
4317
4318 poll_wait(filp, &md_event_waiters, wait);
4319
4320 /* always allow read */
4321 mask = POLLIN | POLLRDNORM;
4322
4323 if (mi->event != atomic_read(&md_event_count))
4324 mask |= POLLERR | POLLPRI;
4325 return mask;
4326}
4327
1da177e4
LT		 4328static struct file_operations md_seq_fops = {
4329 .open = md_seq_open,
4330 .read = seq_read,
4331 .llseek = seq_lseek,
d7603b7e
N		 4332 .release = md_seq_release,
4333 .poll = mdstat_poll,
1da177e4
LT		 4334};
4335
2604b703 4336int register_md_personality(struct mdk_personality *p)
1da177e4 4337{
1da177e4 4338 spin_lock(&pers_lock);
2604b703
N		 4339 list_add_tail(&p->list, &pers_list);
4340 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
1da177e4
LT		 4341 spin_unlock(&pers_lock);
4342 return 0;
4343}
4344
2604b703 4345int unregister_md_personality(struct mdk_personality *p)
1da177e4 4346{
2604b703 4347 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 4348 spin_lock(&pers_lock);
2604b703 4349 list_del_init(&p->list);
1da177e4
LT		 4350 spin_unlock(&pers_lock);
4351 return 0;
4352}
4353
4354static int is_mddev_idle(mddev_t *mddev)
4355{
4356 mdk_rdev_t * rdev;
4357 struct list_head *tmp;
4358 int idle;
4359 unsigned long curr_events;
4360
4361 idle = 1;
4362 ITERATE_RDEV(mddev,rdev,tmp) {
4363 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 4364 curr_events = disk_stat_read(disk, sectors[0]) +
4365 disk_stat_read(disk, sectors[1]) -
1da177e4 4366 atomic_read(&disk->sync_io);
c0e48521
N		 4367 /* The difference between curr_events and last_events
4368 * will be affected by any new non-sync IO (making
4369 * curr_events bigger) and any difference in the amount of
4370 * in-flight syncio (making current_events bigger or smaller)
4371 * The amount in-flight is currently limited to
4372 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4373 * which is at most 4096 sectors.
4374 * These numbers are fairly fragile and should be made
4375 * more robust, probably by enforcing the
4376 * 'window size' that md_do_sync sort-of uses.
4377 *
1da177e4
LT		 4378 * Note: the following is an unsigned comparison.
4379 */
c0e48521 4380 if ((curr_events - rdev->last_events + 4096) > 8192) {
1da177e4
LT		 4381 rdev->last_events = curr_events;
4382 idle = 0;
4383 }
4384 }
4385 return idle;
4386}
4387
4388void md_done_sync(mddev_t *mddev, int blocks, int ok)
4389{
4390 /* another "blocks" (512byte) blocks have been synced */
4391 atomic_sub(blocks, &mddev->recovery_active);
4392 wake_up(&mddev->recovery_wait);
4393 if (!ok) {
4394 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4395 md_wakeup_thread(mddev->thread);
4396 // stop recovery, signal do_sync ....
4397 }
4398}
4399
4400
06d91a5f
N		 4401/* md_write_start(mddev, bi)
4402 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 4403 * in superblock) before writing, schedule a superblock update
4404 * and wait for it to complete.
06d91a5f 4405 */
3d310eb7 4406void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 4407{
06d91a5f 4408 if (bio_data_dir(bi) != WRITE)
3d310eb7 4409 return;
06d91a5f 4410
f91de92e
N		 4411 BUG_ON(mddev->ro == 1);
4412 if (mddev->ro == 2) {
4413 /* need to switch to read/write */
4414 mddev->ro = 0;
4415 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4416 md_wakeup_thread(mddev->thread);
4417 }
06d91a5f 4418 atomic_inc(&mddev->writes_pending);
06d91a5f 4419 if (mddev->in_sync) {
a9701a30 4420 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 4421 if (mddev->in_sync) {
4422 mddev->in_sync = 0;
4423 mddev->sb_dirty = 1;
4424 md_wakeup_thread(mddev->thread);
4425 }
a9701a30 4426 spin_unlock_irq(&mddev->write_lock);
06d91a5f 4427 }
3d310eb7 4428 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
1da177e4
LT		 4429}
4430
4431void md_write_end(mddev_t *mddev)
4432{
4433 if (atomic_dec_and_test(&mddev->writes_pending)) {
4434 if (mddev->safemode == 2)
4435 md_wakeup_thread(mddev->thread);
4436 else
4437 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
4438 }
4439}
4440
75c96f85 4441static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
1da177e4
LT		 4442
4443#define SYNC_MARKS 10
4444#define SYNC_MARK_STEP (3*HZ)
4445static void md_do_sync(mddev_t *mddev)
4446{
4447 mddev_t *mddev2;
4448 unsigned int currspeed = 0,
4449 window;
57afd89f 4450 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 4451 unsigned long mark[SYNC_MARKS];
4452 sector_t mark_cnt[SYNC_MARKS];
4453 int last_mark,m;
4454 struct list_head *tmp;
4455 sector_t last_check;
57afd89f 4456 int skipped = 0;
1da177e4
LT		 4457
4458 /* just incase thread restarts... */
4459 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
4460 return;
4461
4462 /* we overload curr_resync somewhat here.
4463 * 0 == not engaged in resync at all
4464 * 2 == checking that there is no conflict with another sync
4465 * 1 == like 2, but have yielded to allow conflicting resync to
4466 * commense
4467 * other == active in resync - this many blocks
4468 *
4469 * Before starting a resync we must have set curr_resync to
4470 * 2, and then checked that every "conflicting" array has curr_resync
4471 * less than ours. When we find one that is the same or higher
4472 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
4473 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
4474 * This will mean we have to start checking from the beginning again.
4475 *
4476 */
4477
4478 do {
4479 mddev->curr_resync = 2;
4480
4481 try_again:
787453c2 4482 if (kthread_should_stop()) {
6985c43f 4483 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 4484 goto skip;
4485 }
4486 ITERATE_MDDEV(mddev2,tmp) {
1da177e4
LT		 4487 if (mddev2 == mddev)
4488 continue;
4489 if (mddev2->curr_resync &&
4490 match_mddev_units(mddev,mddev2)) {
4491 DEFINE_WAIT(wq);
4492 if (mddev < mddev2 && mddev->curr_resync == 2) {
4493 /* arbitrarily yield */
4494 mddev->curr_resync = 1;
4495 wake_up(&resync_wait);
4496 }
4497 if (mddev > mddev2 && mddev->curr_resync == 1)
4498 /* no need to wait here, we can wait the next
4499 * time 'round when curr_resync == 2
4500 */
4501 continue;
787453c2
N		 4502 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
4503 if (!kthread_should_stop() &&
8712e553 4504 mddev2->curr_resync >= mddev->curr_resync) {
1da177e4
LT		 4505 printk(KERN_INFO "md: delaying resync of %s"
4506 " until %s has finished resync (they"
4507 " share one or more physical units)\n",
4508 mdname(mddev), mdname(mddev2));
4509 mddev_put(mddev2);
4510 schedule();
4511 finish_wait(&resync_wait, &wq);
4512 goto try_again;
4513 }
4514 finish_wait(&resync_wait, &wq);
4515 }
4516 }
4517 } while (mddev->curr_resync < 2);
4518
9d88883e 4519 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 4520 /* resync follows the size requested by the personality,
57afd89f 4521 * which defaults to physical size, but can be virtual size
1da177e4
LT		 4522 */
4523 max_sectors = mddev->resync_max_sectors;
9d88883e
N		 4524 mddev->resync_mismatches = 0;
4525 } else
1da177e4
LT		 4526 /* recovery follows the physical size of devices */
4527 max_sectors = mddev->size << 1;
4528
4529 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
4530 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
88202a0c 4531 " %d KB/sec/disc.\n", speed_min(mddev));
338cec32 4532 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
1da177e4 4533 "(but not more than %d KB/sec) for reconstruction.\n",
88202a0c 4534 speed_max(mddev));
1da177e4
LT		 4535
4536 is_mddev_idle(mddev); /* this also initializes IO event counters */
32a7627c 4537 /* we don't use the checkpoint if there's a bitmap */
24dd469d
N		 4538 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap
4539 && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
1da177e4
LT		 4540 j = mddev->recovery_cp;
4541 else
4542 j = 0;
57afd89f 4543 io_sectors = 0;
1da177e4
LT		 4544 for (m = 0; m < SYNC_MARKS; m++) {
4545 mark[m] = jiffies;
57afd89f 4546 mark_cnt[m] = io_sectors;
1da177e4
LT		 4547 }
4548 last_mark = 0;
4549 mddev->resync_mark = mark[last_mark];
4550 mddev->resync_mark_cnt = mark_cnt[last_mark];
4551
4552 /*
4553 * Tune reconstruction:
4554 */
4555 window = 32*(PAGE_SIZE/512);
4556 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
4557 window/2,(unsigned long long) max_sectors/2);
4558
4559 atomic_set(&mddev->recovery_active, 0);
4560 init_waitqueue_head(&mddev->recovery_wait);
4561 last_check = 0;
4562
4563 if (j>2) {
4564 printk(KERN_INFO
4565 "md: resuming recovery of %s from checkpoint.\n",
4566 mdname(mddev));
4567 mddev->curr_resync = j;
4568 }
4569
4570 while (j < max_sectors) {
57afd89f 4571 sector_t sectors;
1da177e4 4572
57afd89f
N		 4573 skipped = 0;
4574 sectors = mddev->pers->sync_request(mddev, j, &skipped,
88202a0c 4575 currspeed < speed_min(mddev));
57afd89f 4576 if (sectors == 0) {
1da177e4
LT		 4577 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4578 goto out;
4579 }
57afd89f
N		 4580
4581 if (!skipped) { /* actual IO requested */
4582 io_sectors += sectors;
4583 atomic_add(sectors, &mddev->recovery_active);
4584 }
4585
1da177e4
LT		 4586 j += sectors;
4587 if (j>1) mddev->curr_resync = j;
d7603b7e
N		 4588 if (last_check == 0)
4589 /* this is the earliers that rebuilt will be
4590 * visible in /proc/mdstat
4591 */
4592 md_new_event(mddev);
57afd89f
N		 4593
4594 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 4595 continue;
4596
57afd89f 4597 last_check = io_sectors;
1da177e4
LT		 4598
4599 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
4600 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
4601 break;
4602
4603 repeat:
4604 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
4605 /* step marks */
4606 int next = (last_mark+1) % SYNC_MARKS;
4607
4608 mddev->resync_mark = mark[next];
4609 mddev->resync_mark_cnt = mark_cnt[next];
4610 mark[next] = jiffies;
57afd89f 4611 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 4612 last_mark = next;
4613 }
4614
4615
787453c2 4616 if (kthread_should_stop()) {
1da177e4
LT		 4617 /*
4618 * got a signal, exit.
4619 */
4620 printk(KERN_INFO
4621 "md: md_do_sync() got signal ... exiting\n");
1da177e4
LT		 4622 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4623 goto out;
4624 }
4625
4626 /*
4627 * this loop exits only if either when we are slower than
4628 * the 'hard' speed limit, or the system was IO-idle for
4629 * a jiffy.
4630 * the system might be non-idle CPU-wise, but we only care
4631 * about not overloading the IO subsystem. (things like an
4632 * e2fsck being done on the RAID array should execute fast)
4633 */
4634 mddev->queue->unplug_fn(mddev->queue);
4635 cond_resched();
4636
57afd89f
N		 4637 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
4638 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4 4639
88202a0c
N		 4640 if (currspeed > speed_min(mddev)) {
4641 if ((currspeed > speed_max(mddev)) ||
1da177e4 4642 !is_mddev_idle(mddev)) {
c0e48521 4643 msleep(500);
1da177e4
LT		 4644 goto repeat;
4645 }
4646 }
4647 }
4648 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
4649 /*
4650 * this also signals 'finished resyncing' to md_stop
4651 */
4652 out:
4653 mddev->queue->unplug_fn(mddev->queue);
4654
4655 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
4656
4657 /* tell personality that we are finished */
57afd89f 4658 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 4659
4660 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4661 mddev->curr_resync > 2 &&
4662 mddev->curr_resync >= mddev->recovery_cp) {
4663 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4664 printk(KERN_INFO
4665 "md: checkpointing recovery of %s.\n",
4666 mdname(mddev));
4667 mddev->recovery_cp = mddev->curr_resync;
4668 } else
4669 mddev->recovery_cp = MaxSector;
4670 }
4671
1da177e4
LT		 4672 skip:
4673 mddev->curr_resync = 0;
4674 wake_up(&resync_wait);
4675 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
4676 md_wakeup_thread(mddev->thread);
4677}
4678
4679
4680/*
4681 * This routine is regularly called by all per-raid-array threads to
4682 * deal with generic issues like resync and super-block update.
4683 * Raid personalities that don't have a thread (linear/raid0) do not
4684 * need this as they never do any recovery or update the superblock.
4685 *
4686 * It does not do any resync itself, but rather "forks" off other threads
4687 * to do that as needed.
4688 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4689 * "->recovery" and create a thread at ->sync_thread.
4690 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4691 * and wakeups up this thread which will reap the thread and finish up.
4692 * This thread also removes any faulty devices (with nr_pending == 0).
4693 *
4694 * The overall approach is:
4695 * 1/ if the superblock needs updating, update it.
4696 * 2/ If a recovery thread is running, don't do anything else.
4697 * 3/ If recovery has finished, clean up, possibly marking spares active.
4698 * 4/ If there are any faulty devices, remove them.
4699 * 5/ If array is degraded, try to add spares devices
4700 * 6/ If array has spares or is not in-sync, start a resync thread.
4701 */
4702void md_check_recovery(mddev_t *mddev)
4703{
4704 mdk_rdev_t *rdev;
4705 struct list_head *rtmp;
4706
4707
5f40402d
N		 4708 if (mddev->bitmap)
4709 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 4710
4711 if (mddev->ro)
4712 return;
fca4d848
N		 4713
4714 if (signal_pending(current)) {
4715 if (mddev->pers->sync_request) {
4716 printk(KERN_INFO "md: %s in immediate safe mode\n",
4717 mdname(mddev));
4718 mddev->safemode = 2;
4719 }
4720 flush_signals(current);
4721 }
4722
1da177e4
LT		 4723 if ( ! (
4724 mddev->sb_dirty ||
4725 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848
N		 4726 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
4727 (mddev->safemode == 1) ||
4728 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
4729 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 4730 ))
4731 return;
fca4d848 4732
1da177e4
LT		 4733 if (mddev_trylock(mddev)==0) {
4734 int spares =0;
fca4d848 4735
a9701a30 4736 spin_lock_irq(&mddev->write_lock);
fca4d848
N		 4737 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
4738 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
4739 mddev->in_sync = 1;
4740 mddev->sb_dirty = 1;
4741 }
4742 if (mddev->safemode == 1)
4743 mddev->safemode = 0;
a9701a30 4744 spin_unlock_irq(&mddev->write_lock);
fca4d848 4745
1da177e4
LT		 4746 if (mddev->sb_dirty)
4747 md_update_sb(mddev);
06d91a5f 4748
06d91a5f 4749
1da177e4
LT		 4750 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4751 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
4752 /* resync/recovery still happening */
4753 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4754 goto unlock;
4755 }
4756 if (mddev->sync_thread) {
4757 /* resync has finished, collect result */
4758 md_unregister_thread(mddev->sync_thread);
4759 mddev->sync_thread = NULL;
4760 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4761 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4762 /* success...*/
4763 /* activate any spares */
4764 mddev->pers->spare_active(mddev);
4765 }
4766 md_update_sb(mddev);
41158c7e
N		 4767
4768 /* if array is no-longer degraded, then any saved_raid_disk
4769 * information must be scrapped
4770 */
4771 if (!mddev->degraded)
4772 ITERATE_RDEV(mddev,rdev,rtmp)
4773 rdev->saved_raid_disk = -1;
4774
1da177e4
LT		 4775 mddev->recovery = 0;
4776 /* flag recovery needed just to double check */
4777 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
d7603b7e 4778 md_new_event(mddev);
1da177e4
LT		 4779 goto unlock;
4780 }
24dd469d
N		 4781 /* Clear some bits that don't mean anything, but
4782 * might be left set
4783 */
4784 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4785 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
4786 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
4787 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4
LT		 4788
4789 /* no recovery is running.
4790 * remove any failed drives, then
4791 * add spares if possible.
4792 * Spare are also removed and re-added, to allow
4793 * the personality to fail the re-add.
4794 */
4795 ITERATE_RDEV(mddev,rdev,rtmp)
4796 if (rdev->raid_disk >= 0 &&
b2d444d7 4797 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
1da177e4 4798 atomic_read(&rdev->nr_pending)==0) {
86e6ffdd
N		 4799 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
4800 char nm[20];
4801 sprintf(nm,"rd%d", rdev->raid_disk);
4802 sysfs_remove_link(&mddev->kobj, nm);
1da177e4 4803 rdev->raid_disk = -1;
86e6ffdd 4804 }
1da177e4
LT		 4805 }
4806
4807 if (mddev->degraded) {
4808 ITERATE_RDEV(mddev,rdev,rtmp)
4809 if (rdev->raid_disk < 0
b2d444d7 4810 && !test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 4811 if (mddev->pers->hot_add_disk(mddev,rdev)) {
4812 char nm[20];
4813 sprintf(nm, "rd%d", rdev->raid_disk);
4814 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
1da177e4 4815 spares++;
d7603b7e 4816 md_new_event(mddev);
86e6ffdd 4817 } else
1da177e4
LT		 4818 break;
4819 }
4820 }
4821
24dd469d
N		 4822 if (spares) {
4823 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4824 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4825 } else if (mddev->recovery_cp < MaxSector) {
4826 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4827 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4828 /* nothing to be done ... */
1da177e4 4829 goto unlock;
24dd469d 4830
1da177e4
LT		 4831 if (mddev->pers->sync_request) {
4832 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 4833 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
4834 /* We are adding a device or devices to an array
4835 * which has the bitmap stored on all devices.
4836 * So make sure all bitmap pages get written
4837 */
4838 bitmap_write_all(mddev->bitmap);
4839 }
1da177e4
LT		 4840 mddev->sync_thread = md_register_thread(md_do_sync,
4841 mddev,
4842 "%s_resync");
4843 if (!mddev->sync_thread) {
4844 printk(KERN_ERR "%s: could not start resync"
4845 " thread...\n",
4846 mdname(mddev));
4847 /* leave the spares where they are, it shouldn't hurt */
4848 mddev->recovery = 0;
d7603b7e 4849 } else
1da177e4 4850 md_wakeup_thread(mddev->sync_thread);
d7603b7e 4851 md_new_event(mddev);
1da177e4
LT		 4852 }
4853 unlock:
4854 mddev_unlock(mddev);
4855 }
4856}
4857
75c96f85
AB		 4858static int md_notify_reboot(struct notifier_block *this,
4859 unsigned long code, void *x)
1da177e4
LT		 4860{
4861 struct list_head *tmp;
4862 mddev_t *mddev;
4863
4864 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
4865
4866 printk(KERN_INFO "md: stopping all md devices.\n");
4867
4868 ITERATE_MDDEV(mddev,tmp)
4869 if (mddev_trylock(mddev)==0)
4870 do_md_stop (mddev, 1);
4871 /*
4872 * certain more exotic SCSI devices are known to be
4873 * volatile wrt too early system reboots. While the
4874 * right place to handle this issue is the given
4875 * driver, we do want to have a safe RAID driver ...
4876 */
4877 mdelay(1000*1);
4878 }
4879 return NOTIFY_DONE;
4880}
4881
75c96f85 4882static struct notifier_block md_notifier = {
1da177e4
LT		 4883 .notifier_call = md_notify_reboot,
4884 .next = NULL,
4885 .priority = INT_MAX, /* before any real devices */
4886};
4887
4888static void md_geninit(void)
4889{
4890 struct proc_dir_entry *p;
4891
4892 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
4893
4894 p = create_proc_entry("mdstat", S_IRUGO, NULL);
4895 if (p)
4896 p->proc_fops = &md_seq_fops;
4897}
4898
75c96f85 4899static int __init md_init(void)
1da177e4
LT		 4900{
4901 int minor;
4902
4903 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4904 " MD_SB_DISKS=%d\n",
4905 MD_MAJOR_VERSION, MD_MINOR_VERSION,
4906 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
bd926c63 4907 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
32a7627c 4908 BITMAP_MINOR);
1da177e4
LT		 4909
4910 if (register_blkdev(MAJOR_NR, "md"))
4911 return -1;
4912 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
4913 unregister_blkdev(MAJOR_NR, "md");
4914 return -1;
4915 }
4916 devfs_mk_dir("md");
4917 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
4918 md_probe, NULL, NULL);
4919 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
4920 md_probe, NULL, NULL);
4921
4922 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4923 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
4924 S_IFBLK|S_IRUSR|S_IWUSR,
4925 "md/%d", minor);
4926
4927 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4928 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
4929 S_IFBLK|S_IRUSR|S_IWUSR,
4930 "md/mdp%d", minor);
4931
4932
4933 register_reboot_notifier(&md_notifier);
4934 raid_table_header = register_sysctl_table(raid_root_table, 1);
4935
4936 md_geninit();
4937 return (0);
4938}
4939
4940
4941#ifndef MODULE
4942
4943/*
4944 * Searches all registered partitions for autorun RAID arrays
4945 * at boot time.
4946 */
4947static dev_t detected_devices[128];
4948static int dev_cnt;
4949
4950void md_autodetect_dev(dev_t dev)
4951{
4952 if (dev_cnt >= 0 && dev_cnt < 127)
4953 detected_devices[dev_cnt++] = dev;
4954}
4955
4956
4957static void autostart_arrays(int part)
4958{
4959 mdk_rdev_t *rdev;
4960 int i;
4961
4962 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
4963
4964 for (i = 0; i < dev_cnt; i++) {
4965 dev_t dev = detected_devices[i];
4966
4967 rdev = md_import_device(dev,0, 0);
4968 if (IS_ERR(rdev))
4969 continue;
4970
b2d444d7 4971 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4972 MD_BUG();
4973 continue;
4974 }
4975 list_add(&rdev->same_set, &pending_raid_disks);
4976 }
4977 dev_cnt = 0;
4978
4979 autorun_devices(part);
4980}
4981
4982#endif
4983
4984static __exit void md_exit(void)
4985{
4986 mddev_t *mddev;
4987 struct list_head *tmp;
4988 int i;
4989 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
4990 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
4991 for (i=0; i < MAX_MD_DEVS; i++)
4992 devfs_remove("md/%d", i);
4993 for (i=0; i < MAX_MD_DEVS; i++)
4994 devfs_remove("md/d%d", i);
4995
4996 devfs_remove("md");
4997
4998 unregister_blkdev(MAJOR_NR,"md");
4999 unregister_blkdev(mdp_major, "mdp");
5000 unregister_reboot_notifier(&md_notifier);
5001 unregister_sysctl_table(raid_table_header);
5002 remove_proc_entry("mdstat", NULL);
5003 ITERATE_MDDEV(mddev,tmp) {
5004 struct gendisk *disk = mddev->gendisk;
5005 if (!disk)
5006 continue;
5007 export_array(mddev);
5008 del_gendisk(disk);
5009 put_disk(disk);
5010 mddev->gendisk = NULL;
5011 mddev_put(mddev);
5012 }
5013}
5014
5015module_init(md_init)
5016module_exit(md_exit)
5017
f91de92e
N		 5018static int get_ro(char *buffer, struct kernel_param *kp)
5019{
5020 return sprintf(buffer, "%d", start_readonly);
5021}
5022static int set_ro(const char *val, struct kernel_param *kp)
5023{
5024 char *e;
5025 int num = simple_strtoul(val, &e, 10);
5026 if (*val && (*e == '\0' || *e == '\n')) {
5027 start_readonly = num;
4dbcdc75 5028 return 0;
f91de92e
N		 5029 }
5030 return -EINVAL;
5031}
5032
5033module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
6ff8d8ec
N		 5034module_param(start_dirty_degraded, int, 0644);
5035
f91de92e 5036
1da177e4
LT		 5037EXPORT_SYMBOL(register_md_personality);
5038EXPORT_SYMBOL(unregister_md_personality);
5039EXPORT_SYMBOL(md_error);
5040EXPORT_SYMBOL(md_done_sync);
5041EXPORT_SYMBOL(md_write_start);
5042EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 5043EXPORT_SYMBOL(md_register_thread);
5044EXPORT_SYMBOL(md_unregister_thread);
5045EXPORT_SYMBOL(md_wakeup_thread);
5046EXPORT_SYMBOL(md_print_devices);
5047EXPORT_SYMBOL(md_check_recovery);
5048MODULE_LICENSE("GPL");
aa1595e9 5049MODULE_ALIAS("md");
72008652 5050MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
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