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