]> bbs.cooldavid.org Git - net-next-2.6.git/blame - drivers/md/md.c
git://bbs.cooldavid.org / net-next-2.6.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[PATCH] md: improve 'scan_mode' and rename it to 'sync_action'
[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>
45
46#include <linux/init.h>
47
32a7627c
N		 48#include <linux/file.h>
49
1da177e4
LT		 50#ifdef CONFIG_KMOD
51#include <linux/kmod.h>
52#endif
53
54#include <asm/unaligned.h>
55
56#define MAJOR_NR MD_MAJOR
57#define MD_DRIVER
58
59/* 63 partitions with the alternate major number (mdp) */
60#define MdpMinorShift 6
61
62#define DEBUG 0
63#define dprintk(x...) ((void)(DEBUG && printk(x)))
64
65
66#ifndef MODULE
67static void autostart_arrays (int part);
68#endif
69
70static mdk_personality_t *pers[MAX_PERSONALITY];
71static DEFINE_SPINLOCK(pers_lock);
72
73/*
74 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
75 * is 1000 KB/sec, so the extra system load does not show up that much.
76 * Increase it if you want to have more _guaranteed_ speed. Note that
338cec32 77 * the RAID driver will use the maximum available bandwidth if the IO
1da177e4
LT		 78 * subsystem is idle. There is also an 'absolute maximum' reconstruction
79 * speed limit - in case reconstruction slows down your system despite
80 * idle IO detection.
81 *
82 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
83 */
84
85static int sysctl_speed_limit_min = 1000;
86static int sysctl_speed_limit_max = 200000;
87
88static struct ctl_table_header *raid_table_header;
89
90static ctl_table raid_table[] = {
91 {
92 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
93 .procname = "speed_limit_min",
94 .data = &sysctl_speed_limit_min,
95 .maxlen = sizeof(int),
96 .mode = 0644,
97 .proc_handler = &proc_dointvec,
98 },
99 {
100 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
101 .procname = "speed_limit_max",
102 .data = &sysctl_speed_limit_max,
103 .maxlen = sizeof(int),
104 .mode = 0644,
105 .proc_handler = &proc_dointvec,
106 },
107 { .ctl_name = 0 }
108};
109
110static ctl_table raid_dir_table[] = {
111 {
112 .ctl_name = DEV_RAID,
113 .procname = "raid",
114 .maxlen = 0,
115 .mode = 0555,
116 .child = raid_table,
117 },
118 { .ctl_name = 0 }
119};
120
121static ctl_table raid_root_table[] = {
122 {
123 .ctl_name = CTL_DEV,
124 .procname = "dev",
125 .maxlen = 0,
126 .mode = 0555,
127 .child = raid_dir_table,
128 },
129 { .ctl_name = 0 }
130};
131
132static struct block_device_operations md_fops;
133
f91de92e
N		 134static int start_readonly;
135
1da177e4
LT		 136/*
137 * Enables to iterate over all existing md arrays
138 * all_mddevs_lock protects this list.
139 */
140static LIST_HEAD(all_mddevs);
141static DEFINE_SPINLOCK(all_mddevs_lock);
142
143
144/*
145 * iterates through all used mddevs in the system.
146 * We take care to grab the all_mddevs_lock whenever navigating
147 * the list, and to always hold a refcount when unlocked.
148 * Any code which breaks out of this loop while own
149 * a reference to the current mddev and must mddev_put it.
150 */
151#define ITERATE_MDDEV(mddev,tmp) \
152 \
153 for (({ spin_lock(&all_mddevs_lock); \
154 tmp = all_mddevs.next; \
155 mddev = NULL;}); \
156 ({ if (tmp != &all_mddevs) \
157 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
158 spin_unlock(&all_mddevs_lock); \
159 if (mddev) mddev_put(mddev); \
160 mddev = list_entry(tmp, mddev_t, all_mddevs); \
161 tmp != &all_mddevs;}); \
162 ({ spin_lock(&all_mddevs_lock); \
163 tmp = tmp->next;}) \
164 )
165
166
167static int md_fail_request (request_queue_t *q, struct bio *bio)
168{
169 bio_io_error(bio, bio->bi_size);
170 return 0;
171}
172
173static inline mddev_t *mddev_get(mddev_t *mddev)
174{
175 atomic_inc(&mddev->active);
176 return mddev;
177}
178
179static void mddev_put(mddev_t *mddev)
180{
181 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
182 return;
183 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
184 list_del(&mddev->all_mddevs);
185 blk_put_queue(mddev->queue);
eae1701f 186 kobject_unregister(&mddev->kobj);
1da177e4
LT		 187 }
188 spin_unlock(&all_mddevs_lock);
189}
190
191static mddev_t * mddev_find(dev_t unit)
192{
193 mddev_t *mddev, *new = NULL;
194
195 retry:
196 spin_lock(&all_mddevs_lock);
197 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
198 if (mddev->unit == unit) {
199 mddev_get(mddev);
200 spin_unlock(&all_mddevs_lock);
990a8baf 201 kfree(new);
1da177e4
LT		 202 return mddev;
203 }
204
205 if (new) {
206 list_add(&new->all_mddevs, &all_mddevs);
207 spin_unlock(&all_mddevs_lock);
208 return new;
209 }
210 spin_unlock(&all_mddevs_lock);
211
212 new = (mddev_t *) kmalloc(sizeof(*new), GFP_KERNEL);
213 if (!new)
214 return NULL;
215
216 memset(new, 0, sizeof(*new));
217
218 new->unit = unit;
219 if (MAJOR(unit) == MD_MAJOR)
220 new->md_minor = MINOR(unit);
221 else
222 new->md_minor = MINOR(unit) >> MdpMinorShift;
223
224 init_MUTEX(&new->reconfig_sem);
225 INIT_LIST_HEAD(&new->disks);
226 INIT_LIST_HEAD(&new->all_mddevs);
227 init_timer(&new->safemode_timer);
228 atomic_set(&new->active, 1);
06d91a5f 229 spin_lock_init(&new->write_lock);
3d310eb7 230 init_waitqueue_head(&new->sb_wait);
1da177e4
LT		 231
232 new->queue = blk_alloc_queue(GFP_KERNEL);
233 if (!new->queue) {
234 kfree(new);
235 return NULL;
236 }
237
238 blk_queue_make_request(new->queue, md_fail_request);
239
240 goto retry;
241}
242
243static inline int mddev_lock(mddev_t * mddev)
244{
245 return down_interruptible(&mddev->reconfig_sem);
246}
247
248static inline void mddev_lock_uninterruptible(mddev_t * mddev)
249{
250 down(&mddev->reconfig_sem);
251}
252
253static inline int mddev_trylock(mddev_t * mddev)
254{
255 return down_trylock(&mddev->reconfig_sem);
256}
257
258static inline void mddev_unlock(mddev_t * mddev)
259{
260 up(&mddev->reconfig_sem);
261
005eca5e 262 md_wakeup_thread(mddev->thread);
1da177e4
LT		 263}
264
265mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
266{
267 mdk_rdev_t * rdev;
268 struct list_head *tmp;
269
270 ITERATE_RDEV(mddev,rdev,tmp) {
271 if (rdev->desc_nr == nr)
272 return rdev;
273 }
274 return NULL;
275}
276
277static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
278{
279 struct list_head *tmp;
280 mdk_rdev_t *rdev;
281
282 ITERATE_RDEV(mddev,rdev,tmp) {
283 if (rdev->bdev->bd_dev == dev)
284 return rdev;
285 }
286 return NULL;
287}
288
77933d72 289static inline sector_t calc_dev_sboffset(struct block_device *bdev)
1da177e4
LT		 290{
291 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
292 return MD_NEW_SIZE_BLOCKS(size);
293}
294
295static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
296{
297 sector_t size;
298
299 size = rdev->sb_offset;
300
301 if (chunk_size)
302 size &= ~((sector_t)chunk_size/1024 - 1);
303 return size;
304}
305
306static int alloc_disk_sb(mdk_rdev_t * rdev)
307{
308 if (rdev->sb_page)
309 MD_BUG();
310
311 rdev->sb_page = alloc_page(GFP_KERNEL);
312 if (!rdev->sb_page) {
313 printk(KERN_ALERT "md: out of memory.\n");
314 return -EINVAL;
315 }
316
317 return 0;
318}
319
320static void free_disk_sb(mdk_rdev_t * rdev)
321{
322 if (rdev->sb_page) {
323 page_cache_release(rdev->sb_page);
324 rdev->sb_loaded = 0;
325 rdev->sb_page = NULL;
326 rdev->sb_offset = 0;
327 rdev->size = 0;
328 }
329}
330
331
7bfa19f2
N		 332static int super_written(struct bio *bio, unsigned int bytes_done, int error)
333{
334 mdk_rdev_t *rdev = bio->bi_private;
a9701a30 335 mddev_t *mddev = rdev->mddev;
7bfa19f2
N		 336 if (bio->bi_size)
337 return 1;
338
339 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags))
a9701a30 340 md_error(mddev, rdev);
7bfa19f2 341
a9701a30
N		 342 if (atomic_dec_and_test(&mddev->pending_writes))
343 wake_up(&mddev->sb_wait);
f8b58edf 344 bio_put(bio);
7bfa19f2
N		 345 return 0;
346}
347
a9701a30
N		 348static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
349{
350 struct bio *bio2 = bio->bi_private;
351 mdk_rdev_t *rdev = bio2->bi_private;
352 mddev_t *mddev = rdev->mddev;
353 if (bio->bi_size)
354 return 1;
355
356 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
357 error == -EOPNOTSUPP) {
358 unsigned long flags;
359 /* barriers don't appear to be supported :-( */
360 set_bit(BarriersNotsupp, &rdev->flags);
361 mddev->barriers_work = 0;
362 spin_lock_irqsave(&mddev->write_lock, flags);
363 bio2->bi_next = mddev->biolist;
364 mddev->biolist = bio2;
365 spin_unlock_irqrestore(&mddev->write_lock, flags);
366 wake_up(&mddev->sb_wait);
367 bio_put(bio);
368 return 0;
369 }
370 bio_put(bio2);
371 bio->bi_private = rdev;
372 return super_written(bio, bytes_done, error);
373}
374
7bfa19f2
N		 375void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
376 sector_t sector, int size, struct page *page)
377{
378 /* write first size bytes of page to sector of rdev
379 * Increment mddev->pending_writes before returning
380 * and decrement it on completion, waking up sb_wait
381 * if zero is reached.
382 * If an error occurred, call md_error
a9701a30
N		 383 *
384 * As we might need to resubmit the request if BIO_RW_BARRIER
385 * causes ENOTSUPP, we allocate a spare bio...
7bfa19f2
N		 386 */
387 struct bio *bio = bio_alloc(GFP_NOIO, 1);
a9701a30 388 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
7bfa19f2
N		 389
390 bio->bi_bdev = rdev->bdev;
391 bio->bi_sector = sector;
392 bio_add_page(bio, page, size, 0);
393 bio->bi_private = rdev;
394 bio->bi_end_io = super_written;
a9701a30
N		 395 bio->bi_rw = rw;
396
7bfa19f2 397 atomic_inc(&mddev->pending_writes);
a9701a30
N		 398 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
399 struct bio *rbio;
400 rw |= (1<<BIO_RW_BARRIER);
401 rbio = bio_clone(bio, GFP_NOIO);
402 rbio->bi_private = bio;
403 rbio->bi_end_io = super_written_barrier;
404 submit_bio(rw, rbio);
405 } else
406 submit_bio(rw, bio);
407}
408
409void md_super_wait(mddev_t *mddev)
410{
411 /* wait for all superblock writes that were scheduled to complete.
412 * if any had to be retried (due to BARRIER problems), retry them
413 */
414 DEFINE_WAIT(wq);
415 for(;;) {
416 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
417 if (atomic_read(&mddev->pending_writes)==0)
418 break;
419 while (mddev->biolist) {
420 struct bio *bio;
421 spin_lock_irq(&mddev->write_lock);
422 bio = mddev->biolist;
423 mddev->biolist = bio->bi_next ;
424 bio->bi_next = NULL;
425 spin_unlock_irq(&mddev->write_lock);
426 submit_bio(bio->bi_rw, bio);
427 }
428 schedule();
429 }
430 finish_wait(&mddev->sb_wait, &wq);
7bfa19f2
N		 431}
432
1da177e4
LT		 433static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
434{
435 if (bio->bi_size)
436 return 1;
437
438 complete((struct completion*)bio->bi_private);
439 return 0;
440}
441
a654b9d8 442int sync_page_io(struct block_device *bdev, sector_t sector, int size,
1da177e4
LT		 443 struct page *page, int rw)
444{
baaa2c51 445 struct bio *bio = bio_alloc(GFP_NOIO, 1);
1da177e4
LT		 446 struct completion event;
447 int ret;
448
449 rw |= (1 << BIO_RW_SYNC);
450
451 bio->bi_bdev = bdev;
452 bio->bi_sector = sector;
453 bio_add_page(bio, page, size, 0);
454 init_completion(&event);
455 bio->bi_private = &event;
456 bio->bi_end_io = bi_complete;
457 submit_bio(rw, bio);
458 wait_for_completion(&event);
459
460 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
461 bio_put(bio);
462 return ret;
463}
464
0002b271 465static int read_disk_sb(mdk_rdev_t * rdev, int size)
1da177e4
LT		 466{
467 char b[BDEVNAME_SIZE];
468 if (!rdev->sb_page) {
469 MD_BUG();
470 return -EINVAL;
471 }
472 if (rdev->sb_loaded)
473 return 0;
474
475
0002b271 476 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
1da177e4
LT		 477 goto fail;
478 rdev->sb_loaded = 1;
479 return 0;
480
481fail:
482 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
483 bdevname(rdev->bdev,b));
484 return -EINVAL;
485}
486
487static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
488{
489 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
490 (sb1->set_uuid1 == sb2->set_uuid1) &&
491 (sb1->set_uuid2 == sb2->set_uuid2) &&
492 (sb1->set_uuid3 == sb2->set_uuid3))
493
494 return 1;
495
496 return 0;
497}
498
499
500static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
501{
502 int ret;
503 mdp_super_t *tmp1, *tmp2;
504
505 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
506 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
507
508 if (!tmp1 || !tmp2) {
509 ret = 0;
510 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
511 goto abort;
512 }
513
514 *tmp1 = *sb1;
515 *tmp2 = *sb2;
516
517 /*
518 * nr_disks is not constant
519 */
520 tmp1->nr_disks = 0;
521 tmp2->nr_disks = 0;
522
523 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
524 ret = 0;
525 else
526 ret = 1;
527
528abort:
990a8baf
JJ		 529 kfree(tmp1);
530 kfree(tmp2);
1da177e4
LT		 531 return ret;
532}
533
534static unsigned int calc_sb_csum(mdp_super_t * sb)
535{
536 unsigned int disk_csum, csum;
537
538 disk_csum = sb->sb_csum;
539 sb->sb_csum = 0;
540 csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
541 sb->sb_csum = disk_csum;
542 return csum;
543}
544
545
546/*
547 * Handle superblock details.
548 * We want to be able to handle multiple superblock formats
549 * so we have a common interface to them all, and an array of
550 * different handlers.
551 * We rely on user-space to write the initial superblock, and support
552 * reading and updating of superblocks.
553 * Interface methods are:
554 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
555 * loads and validates a superblock on dev.
556 * if refdev != NULL, compare superblocks on both devices
557 * Return:
558 * 0 - dev has a superblock that is compatible with refdev
559 * 1 - dev has a superblock that is compatible and newer than refdev
560 * so dev should be used as the refdev in future
561 * -EINVAL superblock incompatible or invalid
562 * -othererror e.g. -EIO
563 *
564 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
565 * Verify that dev is acceptable into mddev.
566 * The first time, mddev->raid_disks will be 0, and data from
567 * dev should be merged in. Subsequent calls check that dev
568 * is new enough. Return 0 or -EINVAL
569 *
570 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
571 * Update the superblock for rdev with data in mddev
572 * This does not write to disc.
573 *
574 */
575
576struct super_type {
577 char *name;
578 struct module *owner;
579 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
580 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
581 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
582};
583
584/*
585 * load_super for 0.90.0
586 */
587static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
588{
589 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
590 mdp_super_t *sb;
591 int ret;
592 sector_t sb_offset;
593
594 /*
595 * Calculate the position of the superblock,
596 * it's at the end of the disk.
597 *
598 * It also happens to be a multiple of 4Kb.
599 */
600 sb_offset = calc_dev_sboffset(rdev->bdev);
601 rdev->sb_offset = sb_offset;
602
0002b271 603 ret = read_disk_sb(rdev, MD_SB_BYTES);
1da177e4
LT		 604 if (ret) return ret;
605
606 ret = -EINVAL;
607
608 bdevname(rdev->bdev, b);
609 sb = (mdp_super_t*)page_address(rdev->sb_page);
610
611 if (sb->md_magic != MD_SB_MAGIC) {
612 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
613 b);
614 goto abort;
615 }
616
617 if (sb->major_version != 0 ||
618 sb->minor_version != 90) {
619 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
620 sb->major_version, sb->minor_version,
621 b);
622 goto abort;
623 }
624
625 if (sb->raid_disks <= 0)
626 goto abort;
627
628 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
629 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
630 b);
631 goto abort;
632 }
633
634 rdev->preferred_minor = sb->md_minor;
635 rdev->data_offset = 0;
0002b271 636 rdev->sb_size = MD_SB_BYTES;
1da177e4
LT		 637
638 if (sb->level == LEVEL_MULTIPATH)
639 rdev->desc_nr = -1;
640 else
641 rdev->desc_nr = sb->this_disk.number;
642
643 if (refdev == 0)
644 ret = 1;
645 else {
646 __u64 ev1, ev2;
647 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
648 if (!uuid_equal(refsb, sb)) {
649 printk(KERN_WARNING "md: %s has different UUID to %s\n",
650 b, bdevname(refdev->bdev,b2));
651 goto abort;
652 }
653 if (!sb_equal(refsb, sb)) {
654 printk(KERN_WARNING "md: %s has same UUID"
655 " but different superblock to %s\n",
656 b, bdevname(refdev->bdev, b2));
657 goto abort;
658 }
659 ev1 = md_event(sb);
660 ev2 = md_event(refsb);
661 if (ev1 > ev2)
662 ret = 1;
663 else
664 ret = 0;
665 }
666 rdev->size = calc_dev_size(rdev, sb->chunk_size);
667
668 abort:
669 return ret;
670}
671
672/*
673 * validate_super for 0.90.0
674 */
675static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
676{
677 mdp_disk_t *desc;
678 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
679
41158c7e 680 rdev->raid_disk = -1;
b2d444d7 681 rdev->flags = 0;
1da177e4
LT		 682 if (mddev->raid_disks == 0) {
683 mddev->major_version = 0;
684 mddev->minor_version = sb->minor_version;
685 mddev->patch_version = sb->patch_version;
686 mddev->persistent = ! sb->not_persistent;
687 mddev->chunk_size = sb->chunk_size;
688 mddev->ctime = sb->ctime;
689 mddev->utime = sb->utime;
690 mddev->level = sb->level;
691 mddev->layout = sb->layout;
692 mddev->raid_disks = sb->raid_disks;
693 mddev->size = sb->size;
694 mddev->events = md_event(sb);
9223214e 695 mddev->bitmap_offset = 0;
36fa3063 696 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
1da177e4
LT		 697
698 if (sb->state & (1<<MD_SB_CLEAN))
699 mddev->recovery_cp = MaxSector;
700 else {
701 if (sb->events_hi == sb->cp_events_hi &&
702 sb->events_lo == sb->cp_events_lo) {
703 mddev->recovery_cp = sb->recovery_cp;
704 } else
705 mddev->recovery_cp = 0;
706 }
707
708 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
709 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
710 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
711 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
712
713 mddev->max_disks = MD_SB_DISKS;
a654b9d8
N		 714
715 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
716 mddev->bitmap_file == NULL) {
934ce7c8 717 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6) {
a654b9d8
N		 718 /* FIXME use a better test */
719 printk(KERN_WARNING "md: bitmaps only support for raid1\n");
720 return -EINVAL;
721 }
36fa3063 722 mddev->bitmap_offset = mddev->default_bitmap_offset;
a654b9d8
N		 723 }
724
41158c7e
N		 725 } else if (mddev->pers == NULL) {
726 /* Insist on good event counter while assembling */
727 __u64 ev1 = md_event(sb);
1da177e4
LT		 728 ++ev1;
729 if (ev1 < mddev->events)
730 return -EINVAL;
41158c7e
N		 731 } else if (mddev->bitmap) {
732 /* if adding to array with a bitmap, then we can accept an
733 * older device ... but not too old.
734 */
735 __u64 ev1 = md_event(sb);
736 if (ev1 < mddev->bitmap->events_cleared)
737 return 0;
738 } else /* just a hot-add of a new device, leave raid_disk at -1 */
739 return 0;
740
1da177e4 741 if (mddev->level != LEVEL_MULTIPATH) {
1da177e4
LT		 742 desc = sb->disks + rdev->desc_nr;
743
744 if (desc->state & (1<<MD_DISK_FAULTY))
b2d444d7 745 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 746 else if (desc->state & (1<<MD_DISK_SYNC) &&
747 desc->raid_disk < mddev->raid_disks) {
b2d444d7 748 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 749 rdev->raid_disk = desc->raid_disk;
750 }
8ddf9efe
N		 751 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
752 set_bit(WriteMostly, &rdev->flags);
41158c7e 753 } else /* MULTIPATH are always insync */
b2d444d7 754 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 755 return 0;
756}
757
758/*
759 * sync_super for 0.90.0
760 */
761static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
762{
763 mdp_super_t *sb;
764 struct list_head *tmp;
765 mdk_rdev_t *rdev2;
766 int next_spare = mddev->raid_disks;
19133a42 767
1da177e4
LT		 768
769 /* make rdev->sb match mddev data..
770 *
771 * 1/ zero out disks
772 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
773 * 3/ any empty disks < next_spare become removed
774 *
775 * disks[0] gets initialised to REMOVED because
776 * we cannot be sure from other fields if it has
777 * been initialised or not.
778 */
779 int i;
780 int active=0, working=0,failed=0,spare=0,nr_disks=0;
781
61181565
N		 782 rdev->sb_size = MD_SB_BYTES;
783
1da177e4
LT		 784 sb = (mdp_super_t*)page_address(rdev->sb_page);
785
786 memset(sb, 0, sizeof(*sb));
787
788 sb->md_magic = MD_SB_MAGIC;
789 sb->major_version = mddev->major_version;
790 sb->minor_version = mddev->minor_version;
791 sb->patch_version = mddev->patch_version;
792 sb->gvalid_words = 0; /* ignored */
793 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
794 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
795 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
796 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
797
798 sb->ctime = mddev->ctime;
799 sb->level = mddev->level;
800 sb->size = mddev->size;
801 sb->raid_disks = mddev->raid_disks;
802 sb->md_minor = mddev->md_minor;
803 sb->not_persistent = !mddev->persistent;
804 sb->utime = mddev->utime;
805 sb->state = 0;
806 sb->events_hi = (mddev->events>>32);
807 sb->events_lo = (u32)mddev->events;
808
809 if (mddev->in_sync)
810 {
811 sb->recovery_cp = mddev->recovery_cp;
812 sb->cp_events_hi = (mddev->events>>32);
813 sb->cp_events_lo = (u32)mddev->events;
814 if (mddev->recovery_cp == MaxSector)
815 sb->state = (1<< MD_SB_CLEAN);
816 } else
817 sb->recovery_cp = 0;
818
819 sb->layout = mddev->layout;
820 sb->chunk_size = mddev->chunk_size;
821
a654b9d8
N		 822 if (mddev->bitmap && mddev->bitmap_file == NULL)
823 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
824
1da177e4
LT		 825 sb->disks[0].state = (1<<MD_DISK_REMOVED);
826 ITERATE_RDEV(mddev,rdev2,tmp) {
827 mdp_disk_t *d;
86e6ffdd 828 int desc_nr;
b2d444d7
N		 829 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
830 && !test_bit(Faulty, &rdev2->flags))
86e6ffdd 831 desc_nr = rdev2->raid_disk;
1da177e4 832 else
86e6ffdd 833 desc_nr = next_spare++;
19133a42 834 rdev2->desc_nr = desc_nr;
1da177e4
LT		 835 d = &sb->disks[rdev2->desc_nr];
836 nr_disks++;
837 d->number = rdev2->desc_nr;
838 d->major = MAJOR(rdev2->bdev->bd_dev);
839 d->minor = MINOR(rdev2->bdev->bd_dev);
b2d444d7
N		 840 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
841 && !test_bit(Faulty, &rdev2->flags))
1da177e4
LT		 842 d->raid_disk = rdev2->raid_disk;
843 else
844 d->raid_disk = rdev2->desc_nr; /* compatibility */
b2d444d7 845 if (test_bit(Faulty, &rdev2->flags)) {
1da177e4
LT		 846 d->state = (1<<MD_DISK_FAULTY);
847 failed++;
b2d444d7 848 } else if (test_bit(In_sync, &rdev2->flags)) {
1da177e4
LT		 849 d->state = (1<<MD_DISK_ACTIVE);
850 d->state |= (1<<MD_DISK_SYNC);
851 active++;
852 working++;
853 } else {
854 d->state = 0;
855 spare++;
856 working++;
857 }
8ddf9efe
N		 858 if (test_bit(WriteMostly, &rdev2->flags))
859 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4 860 }
1da177e4
LT		 861 /* now set the "removed" and "faulty" bits on any missing devices */
862 for (i=0 ; i < mddev->raid_disks ; i++) {
863 mdp_disk_t *d = &sb->disks[i];
864 if (d->state == 0 && d->number == 0) {
865 d->number = i;
866 d->raid_disk = i;
867 d->state = (1<<MD_DISK_REMOVED);
868 d->state |= (1<<MD_DISK_FAULTY);
869 failed++;
870 }
871 }
872 sb->nr_disks = nr_disks;
873 sb->active_disks = active;
874 sb->working_disks = working;
875 sb->failed_disks = failed;
876 sb->spare_disks = spare;
877
878 sb->this_disk = sb->disks[rdev->desc_nr];
879 sb->sb_csum = calc_sb_csum(sb);
880}
881
882/*
883 * version 1 superblock
884 */
885
886static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
887{
888 unsigned int disk_csum, csum;
889 unsigned long long newcsum;
890 int size = 256 + le32_to_cpu(sb->max_dev)*2;
891 unsigned int *isuper = (unsigned int*)sb;
892 int i;
893
894 disk_csum = sb->sb_csum;
895 sb->sb_csum = 0;
896 newcsum = 0;
897 for (i=0; size>=4; size -= 4 )
898 newcsum += le32_to_cpu(*isuper++);
899
900 if (size == 2)
901 newcsum += le16_to_cpu(*(unsigned short*) isuper);
902
903 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
904 sb->sb_csum = disk_csum;
905 return cpu_to_le32(csum);
906}
907
908static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
909{
910 struct mdp_superblock_1 *sb;
911 int ret;
912 sector_t sb_offset;
913 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 914 int bmask;
1da177e4
LT		 915
916 /*
917 * Calculate the position of the superblock.
918 * It is always aligned to a 4K boundary and
919 * depeding on minor_version, it can be:
920 * 0: At least 8K, but less than 12K, from end of device
921 * 1: At start of device
922 * 2: 4K from start of device.
923 */
924 switch(minor_version) {
925 case 0:
926 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
927 sb_offset -= 8*2;
39730960 928 sb_offset &= ~(sector_t)(4*2-1);
1da177e4
LT		 929 /* convert from sectors to K */
930 sb_offset /= 2;
931 break;
932 case 1:
933 sb_offset = 0;
934 break;
935 case 2:
936 sb_offset = 4;
937 break;
938 default:
939 return -EINVAL;
940 }
941 rdev->sb_offset = sb_offset;
942
0002b271
N		 943 /* superblock is rarely larger than 1K, but it can be larger,
944 * and it is safe to read 4k, so we do that
945 */
946 ret = read_disk_sb(rdev, 4096);
1da177e4
LT		 947 if (ret) return ret;
948
949
950 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
951
952 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
953 sb->major_version != cpu_to_le32(1) ||
954 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
955 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
71c0805c 956 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT		 957 return -EINVAL;
958
959 if (calc_sb_1_csum(sb) != sb->sb_csum) {
960 printk("md: invalid superblock checksum on %s\n",
961 bdevname(rdev->bdev,b));
962 return -EINVAL;
963 }
964 if (le64_to_cpu(sb->data_size) < 10) {
965 printk("md: data_size too small on %s\n",
966 bdevname(rdev->bdev,b));
967 return -EINVAL;
968 }
969 rdev->preferred_minor = 0xffff;
970 rdev->data_offset = le64_to_cpu(sb->data_offset);
971
0002b271 972 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
720a3dc3 973 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
0002b271
N		 974 if (rdev->sb_size & bmask)
975 rdev-> sb_size = (rdev->sb_size | bmask)+1;
976
1da177e4
LT		 977 if (refdev == 0)
978 return 1;
979 else {
980 __u64 ev1, ev2;
981 struct mdp_superblock_1 *refsb =
982 (struct mdp_superblock_1*)page_address(refdev->sb_page);
983
984 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
985 sb->level != refsb->level ||
986 sb->layout != refsb->layout ||
987 sb->chunksize != refsb->chunksize) {
988 printk(KERN_WARNING "md: %s has strangely different"
989 " superblock to %s\n",
990 bdevname(rdev->bdev,b),
991 bdevname(refdev->bdev,b2));
992 return -EINVAL;
993 }
994 ev1 = le64_to_cpu(sb->events);
995 ev2 = le64_to_cpu(refsb->events);
996
997 if (ev1 > ev2)
998 return 1;
999 }
1000 if (minor_version)
1001 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1002 else
1003 rdev->size = rdev->sb_offset;
1004 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1005 return -EINVAL;
1006 rdev->size = le64_to_cpu(sb->data_size)/2;
1007 if (le32_to_cpu(sb->chunksize))
1008 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1009 return 0;
1010}
1011
1012static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1013{
1014 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1015
41158c7e 1016 rdev->raid_disk = -1;
b2d444d7 1017 rdev->flags = 0;
1da177e4
LT		 1018 if (mddev->raid_disks == 0) {
1019 mddev->major_version = 1;
1020 mddev->patch_version = 0;
1021 mddev->persistent = 1;
1022 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1023 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1024 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1025 mddev->level = le32_to_cpu(sb->level);
1026 mddev->layout = le32_to_cpu(sb->layout);
1027 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1028 mddev->size = le64_to_cpu(sb->size)/2;
1029 mddev->events = le64_to_cpu(sb->events);
9223214e 1030 mddev->bitmap_offset = 0;
36fa3063 1031 mddev->default_bitmap_offset = 0;
53e87fbb 1032 mddev->default_bitmap_offset = 1024;
1da177e4
LT		 1033
1034 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1035 memcpy(mddev->uuid, sb->set_uuid, 16);
1036
1037 mddev->max_disks = (4096-256)/2;
a654b9d8 1038
71c0805c 1039 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
a654b9d8
N		 1040 mddev->bitmap_file == NULL ) {
1041 if (mddev->level != 1) {
1042 printk(KERN_WARNING "md: bitmaps only supported for raid1\n");
1043 return -EINVAL;
1044 }
1045 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1046 }
41158c7e
N		 1047 } else if (mddev->pers == NULL) {
1048 /* Insist of good event counter while assembling */
1049 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4
LT		 1050 ++ev1;
1051 if (ev1 < mddev->events)
1052 return -EINVAL;
41158c7e
N		 1053 } else if (mddev->bitmap) {
1054 /* If adding to array with a bitmap, then we can accept an
1055 * older device, but not too old.
1056 */
1057 __u64 ev1 = le64_to_cpu(sb->events);
1058 if (ev1 < mddev->bitmap->events_cleared)
1059 return 0;
1060 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1061 return 0;
1da177e4
LT		 1062
1063 if (mddev->level != LEVEL_MULTIPATH) {
1064 int role;
1065 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1066 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1067 switch(role) {
1068 case 0xffff: /* spare */
1da177e4
LT		 1069 break;
1070 case 0xfffe: /* faulty */
b2d444d7 1071 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 1072 break;
1073 default:
b2d444d7 1074 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1075 rdev->raid_disk = role;
1076 break;
1077 }
8ddf9efe
N		 1078 if (sb->devflags & WriteMostly1)
1079 set_bit(WriteMostly, &rdev->flags);
41158c7e 1080 } else /* MULTIPATH are always insync */
b2d444d7 1081 set_bit(In_sync, &rdev->flags);
41158c7e 1082
1da177e4
LT		 1083 return 0;
1084}
1085
1086static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1087{
1088 struct mdp_superblock_1 *sb;
1089 struct list_head *tmp;
1090 mdk_rdev_t *rdev2;
1091 int max_dev, i;
1092 /* make rdev->sb match mddev and rdev data. */
1093
1094 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1095
1096 sb->feature_map = 0;
1097 sb->pad0 = 0;
1098 memset(sb->pad1, 0, sizeof(sb->pad1));
1099 memset(sb->pad2, 0, sizeof(sb->pad2));
1100 memset(sb->pad3, 0, sizeof(sb->pad3));
1101
1102 sb->utime = cpu_to_le64((__u64)mddev->utime);
1103 sb->events = cpu_to_le64(mddev->events);
1104 if (mddev->in_sync)
1105 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1106 else
1107 sb->resync_offset = cpu_to_le64(0);
1108
a654b9d8
N		 1109 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1110 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
71c0805c 1111 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8
N		 1112 }
1113
1da177e4
LT		 1114 max_dev = 0;
1115 ITERATE_RDEV(mddev,rdev2,tmp)
1116 if (rdev2->desc_nr+1 > max_dev)
1117 max_dev = rdev2->desc_nr+1;
1118
1119 sb->max_dev = cpu_to_le32(max_dev);
1120 for (i=0; i<max_dev;i++)
1121 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1122
1123 ITERATE_RDEV(mddev,rdev2,tmp) {
1124 i = rdev2->desc_nr;
b2d444d7 1125 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1126 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1127 else if (test_bit(In_sync, &rdev2->flags))
1da177e4
LT		 1128 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1129 else
1130 sb->dev_roles[i] = cpu_to_le16(0xffff);
1131 }
1132
1133 sb->recovery_offset = cpu_to_le64(0); /* not supported yet */
1134 sb->sb_csum = calc_sb_1_csum(sb);
1135}
1136
1137
75c96f85 1138static struct super_type super_types[] = {
1da177e4
LT		 1139 [0] = {
1140 .name = "0.90.0",
1141 .owner = THIS_MODULE,
1142 .load_super = super_90_load,
1143 .validate_super = super_90_validate,
1144 .sync_super = super_90_sync,
1145 },
1146 [1] = {
1147 .name = "md-1",
1148 .owner = THIS_MODULE,
1149 .load_super = super_1_load,
1150 .validate_super = super_1_validate,
1151 .sync_super = super_1_sync,
1152 },
1153};
1154
1155static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1156{
1157 struct list_head *tmp;
1158 mdk_rdev_t *rdev;
1159
1160 ITERATE_RDEV(mddev,rdev,tmp)
1161 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1162 return rdev;
1163
1164 return NULL;
1165}
1166
1167static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1168{
1169 struct list_head *tmp;
1170 mdk_rdev_t *rdev;
1171
1172 ITERATE_RDEV(mddev1,rdev,tmp)
1173 if (match_dev_unit(mddev2, rdev))
1174 return 1;
1175
1176 return 0;
1177}
1178
1179static LIST_HEAD(pending_raid_disks);
1180
1181static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1182{
1183 mdk_rdev_t *same_pdev;
1184 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
f637b9f9 1185 struct kobject *ko;
1da177e4
LT		 1186
1187 if (rdev->mddev) {
1188 MD_BUG();
1189 return -EINVAL;
1190 }
1191 same_pdev = match_dev_unit(mddev, rdev);
1192 if (same_pdev)
1193 printk(KERN_WARNING
1194 "%s: WARNING: %s appears to be on the same physical"
1195 " disk as %s. True\n protection against single-disk"
1196 " failure might be compromised.\n",
1197 mdname(mddev), bdevname(rdev->bdev,b),
1198 bdevname(same_pdev->bdev,b2));
1199
1200 /* Verify rdev->desc_nr is unique.
1201 * If it is -1, assign a free number, else
1202 * check number is not in use
1203 */
1204 if (rdev->desc_nr < 0) {
1205 int choice = 0;
1206 if (mddev->pers) choice = mddev->raid_disks;
1207 while (find_rdev_nr(mddev, choice))
1208 choice++;
1209 rdev->desc_nr = choice;
1210 } else {
1211 if (find_rdev_nr(mddev, rdev->desc_nr))
1212 return -EBUSY;
1213 }
19133a42
N		 1214 bdevname(rdev->bdev,b);
1215 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1216 return -ENOMEM;
1da177e4
LT		 1217
1218 list_add(&rdev->same_set, &mddev->disks);
1219 rdev->mddev = mddev;
19133a42 1220 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 1221
9c791977 1222 rdev->kobj.parent = &mddev->kobj;
86e6ffdd
N		 1223 kobject_add(&rdev->kobj);
1224
f637b9f9
N		 1225 if (rdev->bdev->bd_part)
1226 ko = &rdev->bdev->bd_part->kobj;
1227 else
1228 ko = &rdev->bdev->bd_disk->kobj;
1229 sysfs_create_link(&rdev->kobj, ko, "block");
1da177e4
LT		 1230 return 0;
1231}
1232
1233static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1234{
1235 char b[BDEVNAME_SIZE];
1236 if (!rdev->mddev) {
1237 MD_BUG();
1238 return;
1239 }
1240 list_del_init(&rdev->same_set);
1241 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1242 rdev->mddev = NULL;
86e6ffdd
N		 1243 sysfs_remove_link(&rdev->kobj, "block");
1244 kobject_del(&rdev->kobj);
1da177e4
LT		 1245}
1246
1247/*
1248 * prevent the device from being mounted, repartitioned or
1249 * otherwise reused by a RAID array (or any other kernel
1250 * subsystem), by bd_claiming the device.
1251 */
1252static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1253{
1254 int err = 0;
1255 struct block_device *bdev;
1256 char b[BDEVNAME_SIZE];
1257
1258 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1259 if (IS_ERR(bdev)) {
1260 printk(KERN_ERR "md: could not open %s.\n",
1261 __bdevname(dev, b));
1262 return PTR_ERR(bdev);
1263 }
1264 err = bd_claim(bdev, rdev);
1265 if (err) {
1266 printk(KERN_ERR "md: could not bd_claim %s.\n",
1267 bdevname(bdev, b));
1268 blkdev_put(bdev);
1269 return err;
1270 }
1271 rdev->bdev = bdev;
1272 return err;
1273}
1274
1275static void unlock_rdev(mdk_rdev_t *rdev)
1276{
1277 struct block_device *bdev = rdev->bdev;
1278 rdev->bdev = NULL;
1279 if (!bdev)
1280 MD_BUG();
1281 bd_release(bdev);
1282 blkdev_put(bdev);
1283}
1284
1285void md_autodetect_dev(dev_t dev);
1286
1287static void export_rdev(mdk_rdev_t * rdev)
1288{
1289 char b[BDEVNAME_SIZE];
1290 printk(KERN_INFO "md: export_rdev(%s)\n",
1291 bdevname(rdev->bdev,b));
1292 if (rdev->mddev)
1293 MD_BUG();
1294 free_disk_sb(rdev);
1295 list_del_init(&rdev->same_set);
1296#ifndef MODULE
1297 md_autodetect_dev(rdev->bdev->bd_dev);
1298#endif
1299 unlock_rdev(rdev);
86e6ffdd 1300 kobject_put(&rdev->kobj);
1da177e4
LT		 1301}
1302
1303static void kick_rdev_from_array(mdk_rdev_t * rdev)
1304{
1305 unbind_rdev_from_array(rdev);
1306 export_rdev(rdev);
1307}
1308
1309static void export_array(mddev_t *mddev)
1310{
1311 struct list_head *tmp;
1312 mdk_rdev_t *rdev;
1313
1314 ITERATE_RDEV(mddev,rdev,tmp) {
1315 if (!rdev->mddev) {
1316 MD_BUG();
1317 continue;
1318 }
1319 kick_rdev_from_array(rdev);
1320 }
1321 if (!list_empty(&mddev->disks))
1322 MD_BUG();
1323 mddev->raid_disks = 0;
1324 mddev->major_version = 0;
1325}
1326
1327static void print_desc(mdp_disk_t *desc)
1328{
1329 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1330 desc->major,desc->minor,desc->raid_disk,desc->state);
1331}
1332
1333static void print_sb(mdp_super_t *sb)
1334{
1335 int i;
1336
1337 printk(KERN_INFO
1338 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1339 sb->major_version, sb->minor_version, sb->patch_version,
1340 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1341 sb->ctime);
1342 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1343 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1344 sb->md_minor, sb->layout, sb->chunk_size);
1345 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1346 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1347 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1348 sb->failed_disks, sb->spare_disks,
1349 sb->sb_csum, (unsigned long)sb->events_lo);
1350
1351 printk(KERN_INFO);
1352 for (i = 0; i < MD_SB_DISKS; i++) {
1353 mdp_disk_t *desc;
1354
1355 desc = sb->disks + i;
1356 if (desc->number || desc->major || desc->minor ||
1357 desc->raid_disk || (desc->state && (desc->state != 4))) {
1358 printk(" D %2d: ", i);
1359 print_desc(desc);
1360 }
1361 }
1362 printk(KERN_INFO "md: THIS: ");
1363 print_desc(&sb->this_disk);
1364
1365}
1366
1367static void print_rdev(mdk_rdev_t *rdev)
1368{
1369 char b[BDEVNAME_SIZE];
1370 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1371 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
b2d444d7
N		 1372 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1373 rdev->desc_nr);
1da177e4
LT		 1374 if (rdev->sb_loaded) {
1375 printk(KERN_INFO "md: rdev superblock:\n");
1376 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1377 } else
1378 printk(KERN_INFO "md: no rdev superblock!\n");
1379}
1380
1381void md_print_devices(void)
1382{
1383 struct list_head *tmp, *tmp2;
1384 mdk_rdev_t *rdev;
1385 mddev_t *mddev;
1386 char b[BDEVNAME_SIZE];
1387
1388 printk("\n");
1389 printk("md: **********************************\n");
1390 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1391 printk("md: **********************************\n");
1392 ITERATE_MDDEV(mddev,tmp) {
1da177e4 1393
32a7627c
N		 1394 if (mddev->bitmap)
1395 bitmap_print_sb(mddev->bitmap);
1396 else
1397 printk("%s: ", mdname(mddev));
1da177e4
LT		 1398 ITERATE_RDEV(mddev,rdev,tmp2)
1399 printk("<%s>", bdevname(rdev->bdev,b));
1400 printk("\n");
1401
1402 ITERATE_RDEV(mddev,rdev,tmp2)
1403 print_rdev(rdev);
1404 }
1405 printk("md: **********************************\n");
1406 printk("\n");
1407}
1408
1409
1da177e4
LT		 1410static void sync_sbs(mddev_t * mddev)
1411{
1412 mdk_rdev_t *rdev;
1413 struct list_head *tmp;
1414
1415 ITERATE_RDEV(mddev,rdev,tmp) {
1416 super_types[mddev->major_version].
1417 sync_super(mddev, rdev);
1418 rdev->sb_loaded = 1;
1419 }
1420}
1421
1422static void md_update_sb(mddev_t * mddev)
1423{
7bfa19f2 1424 int err;
1da177e4
LT		 1425 struct list_head *tmp;
1426 mdk_rdev_t *rdev;
06d91a5f 1427 int sync_req;
1da177e4 1428
1da177e4 1429repeat:
a9701a30 1430 spin_lock_irq(&mddev->write_lock);
06d91a5f 1431 sync_req = mddev->in_sync;
1da177e4
LT		 1432 mddev->utime = get_seconds();
1433 mddev->events ++;
1434
1435 if (!mddev->events) {
1436 /*
1437 * oops, this 64-bit counter should never wrap.
1438 * Either we are in around ~1 trillion A.C., assuming
1439 * 1 reboot per second, or we have a bug:
1440 */
1441 MD_BUG();
1442 mddev->events --;
1443 }
7bfa19f2 1444 mddev->sb_dirty = 2;
1da177e4
LT		 1445 sync_sbs(mddev);
1446
1447 /*
1448 * do not write anything to disk if using
1449 * nonpersistent superblocks
1450 */
06d91a5f
N		 1451 if (!mddev->persistent) {
1452 mddev->sb_dirty = 0;
a9701a30 1453 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1454 wake_up(&mddev->sb_wait);
1da177e4 1455 return;
06d91a5f 1456 }
a9701a30 1457 spin_unlock_irq(&mddev->write_lock);
1da177e4
LT		 1458
1459 dprintk(KERN_INFO
1460 "md: updating %s RAID superblock on device (in sync %d)\n",
1461 mdname(mddev),mddev->in_sync);
1462
32a7627c 1463 err = bitmap_update_sb(mddev->bitmap);
1da177e4
LT		 1464 ITERATE_RDEV(mddev,rdev,tmp) {
1465 char b[BDEVNAME_SIZE];
1466 dprintk(KERN_INFO "md: ");
b2d444d7 1467 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1468 dprintk("(skipping faulty ");
1469
1470 dprintk("%s ", bdevname(rdev->bdev,b));
b2d444d7 1471 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 1472 md_super_write(mddev,rdev,
0002b271 1473 rdev->sb_offset<<1, rdev->sb_size,
7bfa19f2
N		 1474 rdev->sb_page);
1475 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1476 bdevname(rdev->bdev,b),
1477 (unsigned long long)rdev->sb_offset);
1478
1da177e4
LT		 1479 } else
1480 dprintk(")\n");
7bfa19f2 1481 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT		 1482 /* only need to write one superblock... */
1483 break;
1484 }
a9701a30 1485 md_super_wait(mddev);
7bfa19f2
N		 1486 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1487
a9701a30 1488 spin_lock_irq(&mddev->write_lock);
7bfa19f2 1489 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
06d91a5f 1490 /* have to write it out again */
a9701a30 1491 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N		 1492 goto repeat;
1493 }
1494 mddev->sb_dirty = 0;
a9701a30 1495 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1496 wake_up(&mddev->sb_wait);
06d91a5f 1497
1da177e4
LT		 1498}
1499
86e6ffdd
N		 1500struct rdev_sysfs_entry {
1501 struct attribute attr;
1502 ssize_t (*show)(mdk_rdev_t *, char *);
1503 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1504};
1505
1506static ssize_t
96de1e66 1507state_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1508{
1509 char *sep = "";
1510 int len=0;
1511
b2d444d7 1512 if (test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 1513 len+= sprintf(page+len, "%sfaulty",sep);
1514 sep = ",";
1515 }
b2d444d7 1516 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1517 len += sprintf(page+len, "%sin_sync",sep);
1518 sep = ",";
1519 }
b2d444d7
N		 1520 if (!test_bit(Faulty, &rdev->flags) &&
1521 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1522 len += sprintf(page+len, "%sspare", sep);
1523 sep = ",";
1524 }
1525 return len+sprintf(page+len, "\n");
1526}
1527
96de1e66
N		 1528static struct rdev_sysfs_entry
1529rdev_state = __ATTR_RO(state);
86e6ffdd
N		 1530
1531static ssize_t
96de1e66 1532super_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1533{
1534 if (rdev->sb_loaded && rdev->sb_size) {
1535 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1536 return rdev->sb_size;
1537 } else
1538 return 0;
1539}
96de1e66
N		 1540static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1541
86e6ffdd
N		 1542static struct attribute *rdev_default_attrs[] = {
1543 &rdev_state.attr,
1544 &rdev_super.attr,
1545 NULL,
1546};
1547static ssize_t
1548rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1549{
1550 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1551 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1552
1553 if (!entry->show)
1554 return -EIO;
1555 return entry->show(rdev, page);
1556}
1557
1558static ssize_t
1559rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1560 const char *page, size_t length)
1561{
1562 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1563 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1564
1565 if (!entry->store)
1566 return -EIO;
1567 return entry->store(rdev, page, length);
1568}
1569
1570static void rdev_free(struct kobject *ko)
1571{
1572 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1573 kfree(rdev);
1574}
1575static struct sysfs_ops rdev_sysfs_ops = {
1576 .show = rdev_attr_show,
1577 .store = rdev_attr_store,
1578};
1579static struct kobj_type rdev_ktype = {
1580 .release = rdev_free,
1581 .sysfs_ops = &rdev_sysfs_ops,
1582 .default_attrs = rdev_default_attrs,
1583};
1584
1da177e4
LT		 1585/*
1586 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1587 *
1588 * mark the device faulty if:
1589 *
1590 * - the device is nonexistent (zero size)
1591 * - the device has no valid superblock
1592 *
1593 * a faulty rdev _never_ has rdev->sb set.
1594 */
1595static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1596{
1597 char b[BDEVNAME_SIZE];
1598 int err;
1599 mdk_rdev_t *rdev;
1600 sector_t size;
1601
1602 rdev = (mdk_rdev_t *) kmalloc(sizeof(*rdev), GFP_KERNEL);
1603 if (!rdev) {
1604 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1605 return ERR_PTR(-ENOMEM);
1606 }
1607 memset(rdev, 0, sizeof(*rdev));
1608
1609 if ((err = alloc_disk_sb(rdev)))
1610 goto abort_free;
1611
1612 err = lock_rdev(rdev, newdev);
1613 if (err)
1614 goto abort_free;
1615
86e6ffdd
N		 1616 rdev->kobj.parent = NULL;
1617 rdev->kobj.ktype = &rdev_ktype;
1618 kobject_init(&rdev->kobj);
1619
1da177e4 1620 rdev->desc_nr = -1;
b2d444d7 1621 rdev->flags = 0;
1da177e4
LT		 1622 rdev->data_offset = 0;
1623 atomic_set(&rdev->nr_pending, 0);
ba22dcbf 1624 atomic_set(&rdev->read_errors, 0);
1da177e4
LT		 1625
1626 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
1627 if (!size) {
1628 printk(KERN_WARNING
1629 "md: %s has zero or unknown size, marking faulty!\n",
1630 bdevname(rdev->bdev,b));
1631 err = -EINVAL;
1632 goto abort_free;
1633 }
1634
1635 if (super_format >= 0) {
1636 err = super_types[super_format].
1637 load_super(rdev, NULL, super_minor);
1638 if (err == -EINVAL) {
1639 printk(KERN_WARNING
1640 "md: %s has invalid sb, not importing!\n",
1641 bdevname(rdev->bdev,b));
1642 goto abort_free;
1643 }
1644 if (err < 0) {
1645 printk(KERN_WARNING
1646 "md: could not read %s's sb, not importing!\n",
1647 bdevname(rdev->bdev,b));
1648 goto abort_free;
1649 }
1650 }
1651 INIT_LIST_HEAD(&rdev->same_set);
1652
1653 return rdev;
1654
1655abort_free:
1656 if (rdev->sb_page) {
1657 if (rdev->bdev)
1658 unlock_rdev(rdev);
1659 free_disk_sb(rdev);
1660 }
1661 kfree(rdev);
1662 return ERR_PTR(err);
1663}
1664
1665/*
1666 * Check a full RAID array for plausibility
1667 */
1668
1669
a757e64c 1670static void analyze_sbs(mddev_t * mddev)
1da177e4
LT		 1671{
1672 int i;
1673 struct list_head *tmp;
1674 mdk_rdev_t *rdev, *freshest;
1675 char b[BDEVNAME_SIZE];
1676
1677 freshest = NULL;
1678 ITERATE_RDEV(mddev,rdev,tmp)
1679 switch (super_types[mddev->major_version].
1680 load_super(rdev, freshest, mddev->minor_version)) {
1681 case 1:
1682 freshest = rdev;
1683 break;
1684 case 0:
1685 break;
1686 default:
1687 printk( KERN_ERR \
1688 "md: fatal superblock inconsistency in %s"
1689 " -- removing from array\n",
1690 bdevname(rdev->bdev,b));
1691 kick_rdev_from_array(rdev);
1692 }
1693
1694
1695 super_types[mddev->major_version].
1696 validate_super(mddev, freshest);
1697
1698 i = 0;
1699 ITERATE_RDEV(mddev,rdev,tmp) {
1700 if (rdev != freshest)
1701 if (super_types[mddev->major_version].
1702 validate_super(mddev, rdev)) {
1703 printk(KERN_WARNING "md: kicking non-fresh %s"
1704 " from array!\n",
1705 bdevname(rdev->bdev,b));
1706 kick_rdev_from_array(rdev);
1707 continue;
1708 }
1709 if (mddev->level == LEVEL_MULTIPATH) {
1710 rdev->desc_nr = i++;
1711 rdev->raid_disk = rdev->desc_nr;
b2d444d7 1712 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1713 }
1714 }
1715
1716
1717
1718 if (mddev->recovery_cp != MaxSector &&
1719 mddev->level >= 1)
1720 printk(KERN_ERR "md: %s: raid array is not clean"
1721 " -- starting background reconstruction\n",
1722 mdname(mddev));
1723
1da177e4
LT		 1724}
1725
eae1701f 1726static ssize_t
96de1e66 1727level_show(mddev_t *mddev, char *page)
eae1701f
N		 1728{
1729 mdk_personality_t *p = mddev->pers;
1730 if (p == NULL)
1731 return 0;
1732 if (mddev->level >= 0)
1733 return sprintf(page, "RAID-%d\n", mddev->level);
1734 else
1735 return sprintf(page, "%s\n", p->name);
1736}
1737
96de1e66 1738static struct md_sysfs_entry md_level = __ATTR_RO(level);
eae1701f
N		 1739
1740static ssize_t
96de1e66 1741raid_disks_show(mddev_t *mddev, char *page)
eae1701f
N		 1742{
1743 return sprintf(page, "%d\n", mddev->raid_disks);
1744}
1745
96de1e66 1746static struct md_sysfs_entry md_raid_disks = __ATTR_RO(raid_disks);
eae1701f 1747
24dd469d 1748static ssize_t
7eec314d 1749action_show(mddev_t *mddev, char *page)
24dd469d 1750{
7eec314d 1751 char *type = "idle";
31399d9e
N		 1752 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
1753 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
1754 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N		 1755 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
1756 type = "resync";
1757 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
1758 type = "check";
1759 else
1760 type = "repair";
1761 } else
1762 type = "recover";
1763 }
1764 return sprintf(page, "%s\n", type);
1765}
1766
1767static ssize_t
7eec314d 1768action_store(mddev_t *mddev, const char *page, size_t len)
24dd469d 1769{
7eec314d
N		 1770 if (!mddev->pers || !mddev->pers->sync_request)
1771 return -EINVAL;
1772
1773 if (strcmp(page, "idle")==0 || strcmp(page, "idle\n")==0) {
1774 if (mddev->sync_thread) {
1775 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1776 md_unregister_thread(mddev->sync_thread);
1777 mddev->sync_thread = NULL;
1778 mddev->recovery = 0;
1779 }
1780 return len;
1781 }
31399d9e
N		 1782
1783 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
1784 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 1785 return -EBUSY;
7eec314d
N		 1786 if (strcmp(page, "resync")==0 || strcmp(page, "resync\n")==0 ||
1787 strcmp(page, "recover")==0 || strcmp(page, "recover\n")==0)
1788 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
1789 else {
1790 if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0)
1791 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
1792 else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0)
1793 return -EINVAL;
1794 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
1795 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
1796 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
1797 }
24dd469d
N		 1798 md_wakeup_thread(mddev->thread);
1799 return len;
1800}
1801
9d88883e 1802static ssize_t
96de1e66 1803mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 1804{
1805 return sprintf(page, "%llu\n",
1806 (unsigned long long) mddev->resync_mismatches);
1807}
1808
96de1e66 1809static struct md_sysfs_entry
7eec314d 1810md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 1811
96de1e66
N		 1812
1813static struct md_sysfs_entry
1814md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 1815
eae1701f
N		 1816static struct attribute *md_default_attrs[] = {
1817 &md_level.attr,
1818 &md_raid_disks.attr,
411036fa
N		 1819 NULL,
1820};
1821
1822static struct attribute *md_redundancy_attrs[] = {
24dd469d 1823 &md_scan_mode.attr,
9d88883e 1824 &md_mismatches.attr,
eae1701f
N		 1825 NULL,
1826};
411036fa
N		 1827static struct attribute_group md_redundancy_group = {
1828 .name = NULL,
1829 .attrs = md_redundancy_attrs,
1830};
1831
eae1701f
N		 1832
1833static ssize_t
1834md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1835{
1836 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
1837 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 1838 ssize_t rv;
eae1701f
N		 1839
1840 if (!entry->show)
1841 return -EIO;
96de1e66
N		 1842 mddev_lock(mddev);
1843 rv = entry->show(mddev, page);
1844 mddev_unlock(mddev);
1845 return rv;
eae1701f
N		 1846}
1847
1848static ssize_t
1849md_attr_store(struct kobject *kobj, struct attribute *attr,
1850 const char *page, size_t length)
1851{
1852 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
1853 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 1854 ssize_t rv;
eae1701f
N		 1855
1856 if (!entry->store)
1857 return -EIO;
96de1e66
N		 1858 mddev_lock(mddev);
1859 rv = entry->store(mddev, page, length);
1860 mddev_unlock(mddev);
1861 return rv;
eae1701f
N		 1862}
1863
1864static void md_free(struct kobject *ko)
1865{
1866 mddev_t *mddev = container_of(ko, mddev_t, kobj);
1867 kfree(mddev);
1868}
1869
1870static struct sysfs_ops md_sysfs_ops = {
1871 .show = md_attr_show,
1872 .store = md_attr_store,
1873};
1874static struct kobj_type md_ktype = {
1875 .release = md_free,
1876 .sysfs_ops = &md_sysfs_ops,
1877 .default_attrs = md_default_attrs,
1878};
1879
1da177e4
LT		 1880int mdp_major = 0;
1881
1882static struct kobject *md_probe(dev_t dev, int *part, void *data)
1883{
1884 static DECLARE_MUTEX(disks_sem);
1885 mddev_t *mddev = mddev_find(dev);
1886 struct gendisk *disk;
1887 int partitioned = (MAJOR(dev) != MD_MAJOR);
1888 int shift = partitioned ? MdpMinorShift : 0;
1889 int unit = MINOR(dev) >> shift;
1890
1891 if (!mddev)
1892 return NULL;
1893
1894 down(&disks_sem);
1895 if (mddev->gendisk) {
1896 up(&disks_sem);
1897 mddev_put(mddev);
1898 return NULL;
1899 }
1900 disk = alloc_disk(1 << shift);
1901 if (!disk) {
1902 up(&disks_sem);
1903 mddev_put(mddev);
1904 return NULL;
1905 }
1906 disk->major = MAJOR(dev);
1907 disk->first_minor = unit << shift;
1908 if (partitioned) {
1909 sprintf(disk->disk_name, "md_d%d", unit);
1910 sprintf(disk->devfs_name, "md/d%d", unit);
1911 } else {
1912 sprintf(disk->disk_name, "md%d", unit);
1913 sprintf(disk->devfs_name, "md/%d", unit);
1914 }
1915 disk->fops = &md_fops;
1916 disk->private_data = mddev;
1917 disk->queue = mddev->queue;
1918 add_disk(disk);
1919 mddev->gendisk = disk;
1920 up(&disks_sem);
9c791977 1921 mddev->kobj.parent = &disk->kobj;
eae1701f
N		 1922 mddev->kobj.k_name = NULL;
1923 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
1924 mddev->kobj.ktype = &md_ktype;
1925 kobject_register(&mddev->kobj);
1da177e4
LT		 1926 return NULL;
1927}
1928
1929void md_wakeup_thread(mdk_thread_t *thread);
1930
1931static void md_safemode_timeout(unsigned long data)
1932{
1933 mddev_t *mddev = (mddev_t *) data;
1934
1935 mddev->safemode = 1;
1936 md_wakeup_thread(mddev->thread);
1937}
1938
1939
1940static int do_md_run(mddev_t * mddev)
1941{
1942 int pnum, err;
1943 int chunk_size;
1944 struct list_head *tmp;
1945 mdk_rdev_t *rdev;
1946 struct gendisk *disk;
1947 char b[BDEVNAME_SIZE];
1948
a757e64c
N		 1949 if (list_empty(&mddev->disks))
1950 /* cannot run an array with no devices.. */
1da177e4 1951 return -EINVAL;
1da177e4
LT		 1952
1953 if (mddev->pers)
1954 return -EBUSY;
1955
1956 /*
1957 * Analyze all RAID superblock(s)
1958 */
a757e64c
N		 1959 if (!mddev->raid_disks)
1960 analyze_sbs(mddev);
1da177e4
LT		 1961
1962 chunk_size = mddev->chunk_size;
1963 pnum = level_to_pers(mddev->level);
1964
1965 if ((pnum != MULTIPATH) && (pnum != RAID1)) {
1966 if (!chunk_size) {
1967 /*
1968 * 'default chunksize' in the old md code used to
1969 * be PAGE_SIZE, baaad.
1970 * we abort here to be on the safe side. We don't
1971 * want to continue the bad practice.
1972 */
1973 printk(KERN_ERR
1974 "no chunksize specified, see 'man raidtab'\n");
1975 return -EINVAL;
1976 }
1977 if (chunk_size > MAX_CHUNK_SIZE) {
1978 printk(KERN_ERR "too big chunk_size: %d > %d\n",
1979 chunk_size, MAX_CHUNK_SIZE);
1980 return -EINVAL;
1981 }
1982 /*
1983 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
1984 */
1985 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 1986 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 1987 return -EINVAL;
1988 }
1989 if (chunk_size < PAGE_SIZE) {
1990 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
1991 chunk_size, PAGE_SIZE);
1992 return -EINVAL;
1993 }
1994
1995 /* devices must have minimum size of one chunk */
1996 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 1997 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1998 continue;
1999 if (rdev->size < chunk_size / 1024) {
2000 printk(KERN_WARNING
2001 "md: Dev %s smaller than chunk_size:"
2002 " %lluk < %dk\n",
2003 bdevname(rdev->bdev,b),
2004 (unsigned long long)rdev->size,
2005 chunk_size / 1024);
2006 return -EINVAL;
2007 }
2008 }
2009 }
2010
1da177e4
LT		 2011#ifdef CONFIG_KMOD
2012 if (!pers[pnum])
2013 {
2014 request_module("md-personality-%d", pnum);
2015 }
2016#endif
2017
2018 /*
2019 * Drop all container device buffers, from now on
2020 * the only valid external interface is through the md
2021 * device.
2022 * Also find largest hardsector size
2023 */
2024 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2025 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2026 continue;
2027 sync_blockdev(rdev->bdev);
2028 invalidate_bdev(rdev->bdev, 0);
2029 }
2030
2031 md_probe(mddev->unit, NULL, NULL);
2032 disk = mddev->gendisk;
2033 if (!disk)
2034 return -ENOMEM;
2035
2036 spin_lock(&pers_lock);
2037 if (!pers[pnum] || !try_module_get(pers[pnum]->owner)) {
2038 spin_unlock(&pers_lock);
2039 printk(KERN_WARNING "md: personality %d is not loaded!\n",
2040 pnum);
2041 return -EINVAL;
2042 }
2043
2044 mddev->pers = pers[pnum];
2045 spin_unlock(&pers_lock);
2046
657390d2 2047 mddev->recovery = 0;
1da177e4 2048 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 2049 mddev->barriers_work = 1;
1da177e4 2050
f91de92e
N		 2051 if (start_readonly)
2052 mddev->ro = 2; /* read-only, but switch on first write */
2053
32a7627c
N		 2054 /* before we start the array running, initialise the bitmap */
2055 err = bitmap_create(mddev);
2056 if (err)
2057 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
2058 mdname(mddev), err);
2059 else
2060 err = mddev->pers->run(mddev);
1da177e4
LT		 2061 if (err) {
2062 printk(KERN_ERR "md: pers->run() failed ...\n");
2063 module_put(mddev->pers->owner);
2064 mddev->pers = NULL;
32a7627c
N		 2065 bitmap_destroy(mddev);
2066 return err;
1da177e4 2067 }
411036fa
N		 2068 if (mddev->pers->sync_request)
2069 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
fd9d49ca
N		 2070 else if (mddev->ro == 2) /* auto-readonly not meaningful */
2071 mddev->ro = 0;
2072
1da177e4
LT		 2073 atomic_set(&mddev->writes_pending,0);
2074 mddev->safemode = 0;
2075 mddev->safemode_timer.function = md_safemode_timeout;
2076 mddev->safemode_timer.data = (unsigned long) mddev;
2077 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */
2078 mddev->in_sync = 1;
86e6ffdd
N		 2079
2080 ITERATE_RDEV(mddev,rdev,tmp)
2081 if (rdev->raid_disk >= 0) {
2082 char nm[20];
2083 sprintf(nm, "rd%d", rdev->raid_disk);
2084 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2085 }
1da177e4
LT		 2086
2087 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 2088 md_wakeup_thread(mddev->thread);
1da177e4
LT		 2089
2090 if (mddev->sb_dirty)
2091 md_update_sb(mddev);
2092
2093 set_capacity(disk, mddev->array_size<<1);
2094
2095 /* If we call blk_queue_make_request here, it will
2096 * re-initialise max_sectors etc which may have been
2097 * refined inside -> run. So just set the bits we need to set.
2098 * Most initialisation happended when we called
2099 * blk_queue_make_request(..., md_fail_request)
2100 * earlier.
2101 */
2102 mddev->queue->queuedata = mddev;
2103 mddev->queue->make_request_fn = mddev->pers->make_request;
2104
2105 mddev->changed = 1;
2106 return 0;
2107}
2108
2109static int restart_array(mddev_t *mddev)
2110{
2111 struct gendisk *disk = mddev->gendisk;
2112 int err;
2113
2114 /*
2115 * Complain if it has no devices
2116 */
2117 err = -ENXIO;
2118 if (list_empty(&mddev->disks))
2119 goto out;
2120
2121 if (mddev->pers) {
2122 err = -EBUSY;
2123 if (!mddev->ro)
2124 goto out;
2125
2126 mddev->safemode = 0;
2127 mddev->ro = 0;
2128 set_disk_ro(disk, 0);
2129
2130 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2131 mdname(mddev));
2132 /*
2133 * Kick recovery or resync if necessary
2134 */
2135 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2136 md_wakeup_thread(mddev->thread);
2137 err = 0;
2138 } else {
2139 printk(KERN_ERR "md: %s has no personality assigned.\n",
2140 mdname(mddev));
2141 err = -EINVAL;
2142 }
2143
2144out:
2145 return err;
2146}
2147
2148static int do_md_stop(mddev_t * mddev, int ro)
2149{
2150 int err = 0;
2151 struct gendisk *disk = mddev->gendisk;
2152
2153 if (mddev->pers) {
2154 if (atomic_read(&mddev->active)>2) {
2155 printk("md: %s still in use.\n",mdname(mddev));
2156 return -EBUSY;
2157 }
2158
2159 if (mddev->sync_thread) {
2160 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2161 md_unregister_thread(mddev->sync_thread);
2162 mddev->sync_thread = NULL;
2163 }
2164
2165 del_timer_sync(&mddev->safemode_timer);
2166
2167 invalidate_partition(disk, 0);
2168
2169 if (ro) {
2170 err = -ENXIO;
f91de92e 2171 if (mddev->ro==1)
1da177e4
LT		 2172 goto out;
2173 mddev->ro = 1;
2174 } else {
6b8b3e8a 2175 bitmap_flush(mddev);
a9701a30 2176 md_super_wait(mddev);
1da177e4
LT		 2177 if (mddev->ro)
2178 set_disk_ro(disk, 0);
2179 blk_queue_make_request(mddev->queue, md_fail_request);
2180 mddev->pers->stop(mddev);
411036fa
N		 2181 if (mddev->pers->sync_request)
2182 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
2183
1da177e4
LT		 2184 module_put(mddev->pers->owner);
2185 mddev->pers = NULL;
2186 if (mddev->ro)
2187 mddev->ro = 0;
2188 }
2189 if (!mddev->in_sync) {
2190 /* mark array as shutdown cleanly */
2191 mddev->in_sync = 1;
2192 md_update_sb(mddev);
2193 }
2194 if (ro)
2195 set_disk_ro(disk, 1);
2196 }
32a7627c
N		 2197
2198 bitmap_destroy(mddev);
2199 if (mddev->bitmap_file) {
2200 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
2201 fput(mddev->bitmap_file);
2202 mddev->bitmap_file = NULL;
2203 }
9223214e 2204 mddev->bitmap_offset = 0;
32a7627c 2205
1da177e4
LT		 2206 /*
2207 * Free resources if final stop
2208 */
2209 if (!ro) {
86e6ffdd
N		 2210 mdk_rdev_t *rdev;
2211 struct list_head *tmp;
1da177e4
LT		 2212 struct gendisk *disk;
2213 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
2214
86e6ffdd
N		 2215 ITERATE_RDEV(mddev,rdev,tmp)
2216 if (rdev->raid_disk >= 0) {
2217 char nm[20];
2218 sprintf(nm, "rd%d", rdev->raid_disk);
2219 sysfs_remove_link(&mddev->kobj, nm);
2220 }
2221
1da177e4
LT		 2222 export_array(mddev);
2223
2224 mddev->array_size = 0;
2225 disk = mddev->gendisk;
2226 if (disk)
2227 set_capacity(disk, 0);
2228 mddev->changed = 1;
2229 } else
2230 printk(KERN_INFO "md: %s switched to read-only mode.\n",
2231 mdname(mddev));
2232 err = 0;
2233out:
2234 return err;
2235}
2236
2237static void autorun_array(mddev_t *mddev)
2238{
2239 mdk_rdev_t *rdev;
2240 struct list_head *tmp;
2241 int err;
2242
a757e64c 2243 if (list_empty(&mddev->disks))
1da177e4 2244 return;
1da177e4
LT		 2245
2246 printk(KERN_INFO "md: running: ");
2247
2248 ITERATE_RDEV(mddev,rdev,tmp) {
2249 char b[BDEVNAME_SIZE];
2250 printk("<%s>", bdevname(rdev->bdev,b));
2251 }
2252 printk("\n");
2253
2254 err = do_md_run (mddev);
2255 if (err) {
2256 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
2257 do_md_stop (mddev, 0);
2258 }
2259}
2260
2261/*
2262 * lets try to run arrays based on all disks that have arrived
2263 * until now. (those are in pending_raid_disks)
2264 *
2265 * the method: pick the first pending disk, collect all disks with
2266 * the same UUID, remove all from the pending list and put them into
2267 * the 'same_array' list. Then order this list based on superblock
2268 * update time (freshest comes first), kick out 'old' disks and
2269 * compare superblocks. If everything's fine then run it.
2270 *
2271 * If "unit" is allocated, then bump its reference count
2272 */
2273static void autorun_devices(int part)
2274{
2275 struct list_head candidates;
2276 struct list_head *tmp;
2277 mdk_rdev_t *rdev0, *rdev;
2278 mddev_t *mddev;
2279 char b[BDEVNAME_SIZE];
2280
2281 printk(KERN_INFO "md: autorun ...\n");
2282 while (!list_empty(&pending_raid_disks)) {
2283 dev_t dev;
2284 rdev0 = list_entry(pending_raid_disks.next,
2285 mdk_rdev_t, same_set);
2286
2287 printk(KERN_INFO "md: considering %s ...\n",
2288 bdevname(rdev0->bdev,b));
2289 INIT_LIST_HEAD(&candidates);
2290 ITERATE_RDEV_PENDING(rdev,tmp)
2291 if (super_90_load(rdev, rdev0, 0) >= 0) {
2292 printk(KERN_INFO "md: adding %s ...\n",
2293 bdevname(rdev->bdev,b));
2294 list_move(&rdev->same_set, &candidates);
2295 }
2296 /*
2297 * now we have a set of devices, with all of them having
2298 * mostly sane superblocks. It's time to allocate the
2299 * mddev.
2300 */
2301 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
2302 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
2303 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
2304 break;
2305 }
2306 if (part)
2307 dev = MKDEV(mdp_major,
2308 rdev0->preferred_minor << MdpMinorShift);
2309 else
2310 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
2311
2312 md_probe(dev, NULL, NULL);
2313 mddev = mddev_find(dev);
2314 if (!mddev) {
2315 printk(KERN_ERR
2316 "md: cannot allocate memory for md drive.\n");
2317 break;
2318 }
2319 if (mddev_lock(mddev))
2320 printk(KERN_WARNING "md: %s locked, cannot run\n",
2321 mdname(mddev));
2322 else if (mddev->raid_disks || mddev->major_version
2323 || !list_empty(&mddev->disks)) {
2324 printk(KERN_WARNING
2325 "md: %s already running, cannot run %s\n",
2326 mdname(mddev), bdevname(rdev0->bdev,b));
2327 mddev_unlock(mddev);
2328 } else {
2329 printk(KERN_INFO "md: created %s\n", mdname(mddev));
2330 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
2331 list_del_init(&rdev->same_set);
2332 if (bind_rdev_to_array(rdev, mddev))
2333 export_rdev(rdev);
2334 }
2335 autorun_array(mddev);
2336 mddev_unlock(mddev);
2337 }
2338 /* on success, candidates will be empty, on error
2339 * it won't...
2340 */
2341 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
2342 export_rdev(rdev);
2343 mddev_put(mddev);
2344 }
2345 printk(KERN_INFO "md: ... autorun DONE.\n");
2346}
2347
2348/*
2349 * import RAID devices based on one partition
2350 * if possible, the array gets run as well.
2351 */
2352
2353static int autostart_array(dev_t startdev)
2354{
2355 char b[BDEVNAME_SIZE];
2356 int err = -EINVAL, i;
2357 mdp_super_t *sb = NULL;
2358 mdk_rdev_t *start_rdev = NULL, *rdev;
2359
2360 start_rdev = md_import_device(startdev, 0, 0);
2361 if (IS_ERR(start_rdev))
2362 return err;
2363
2364
2365 /* NOTE: this can only work for 0.90.0 superblocks */
2366 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
2367 if (sb->major_version != 0 ||
2368 sb->minor_version != 90 ) {
2369 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
2370 export_rdev(start_rdev);
2371 return err;
2372 }
2373
b2d444d7 2374 if (test_bit(Faulty, &start_rdev->flags)) {
1da177e4
LT		 2375 printk(KERN_WARNING
2376 "md: can not autostart based on faulty %s!\n",
2377 bdevname(start_rdev->bdev,b));
2378 export_rdev(start_rdev);
2379 return err;
2380 }
2381 list_add(&start_rdev->same_set, &pending_raid_disks);
2382
2383 for (i = 0; i < MD_SB_DISKS; i++) {
2384 mdp_disk_t *desc = sb->disks + i;
2385 dev_t dev = MKDEV(desc->major, desc->minor);
2386
2387 if (!dev)
2388 continue;
2389 if (dev == startdev)
2390 continue;
2391 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
2392 continue;
2393 rdev = md_import_device(dev, 0, 0);
2394 if (IS_ERR(rdev))
2395 continue;
2396
2397 list_add(&rdev->same_set, &pending_raid_disks);
2398 }
2399
2400 /*
2401 * possibly return codes
2402 */
2403 autorun_devices(0);
2404 return 0;
2405
2406}
2407
2408
2409static int get_version(void __user * arg)
2410{
2411 mdu_version_t ver;
2412
2413 ver.major = MD_MAJOR_VERSION;
2414 ver.minor = MD_MINOR_VERSION;
2415 ver.patchlevel = MD_PATCHLEVEL_VERSION;
2416
2417 if (copy_to_user(arg, &ver, sizeof(ver)))
2418 return -EFAULT;
2419
2420 return 0;
2421}
2422
2423static int get_array_info(mddev_t * mddev, void __user * arg)
2424{
2425 mdu_array_info_t info;
2426 int nr,working,active,failed,spare;
2427 mdk_rdev_t *rdev;
2428 struct list_head *tmp;
2429
2430 nr=working=active=failed=spare=0;
2431 ITERATE_RDEV(mddev,rdev,tmp) {
2432 nr++;
b2d444d7 2433 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2434 failed++;
2435 else {
2436 working++;
b2d444d7 2437 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 2438 active++;
2439 else
2440 spare++;
2441 }
2442 }
2443
2444 info.major_version = mddev->major_version;
2445 info.minor_version = mddev->minor_version;
2446 info.patch_version = MD_PATCHLEVEL_VERSION;
2447 info.ctime = mddev->ctime;
2448 info.level = mddev->level;
2449 info.size = mddev->size;
2450 info.nr_disks = nr;
2451 info.raid_disks = mddev->raid_disks;
2452 info.md_minor = mddev->md_minor;
2453 info.not_persistent= !mddev->persistent;
2454
2455 info.utime = mddev->utime;
2456 info.state = 0;
2457 if (mddev->in_sync)
2458 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 2459 if (mddev->bitmap && mddev->bitmap_offset)
2460 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 2461 info.active_disks = active;
2462 info.working_disks = working;
2463 info.failed_disks = failed;
2464 info.spare_disks = spare;
2465
2466 info.layout = mddev->layout;
2467 info.chunk_size = mddev->chunk_size;
2468
2469 if (copy_to_user(arg, &info, sizeof(info)))
2470 return -EFAULT;
2471
2472 return 0;
2473}
2474
87162a28 2475static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 2476{
2477 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
2478 char *ptr, *buf = NULL;
2479 int err = -ENOMEM;
2480
2481 file = kmalloc(sizeof(*file), GFP_KERNEL);
2482 if (!file)
2483 goto out;
2484
2485 /* bitmap disabled, zero the first byte and copy out */
2486 if (!mddev->bitmap || !mddev->bitmap->file) {
2487 file->pathname[0] = '\0';
2488 goto copy_out;
2489 }
2490
2491 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
2492 if (!buf)
2493 goto out;
2494
2495 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
2496 if (!ptr)
2497 goto out;
2498
2499 strcpy(file->pathname, ptr);
2500
2501copy_out:
2502 err = 0;
2503 if (copy_to_user(arg, file, sizeof(*file)))
2504 err = -EFAULT;
2505out:
2506 kfree(buf);
2507 kfree(file);
2508 return err;
2509}
2510
1da177e4
LT		 2511static int get_disk_info(mddev_t * mddev, void __user * arg)
2512{
2513 mdu_disk_info_t info;
2514 unsigned int nr;
2515 mdk_rdev_t *rdev;
2516
2517 if (copy_from_user(&info, arg, sizeof(info)))
2518 return -EFAULT;
2519
2520 nr = info.number;
2521
2522 rdev = find_rdev_nr(mddev, nr);
2523 if (rdev) {
2524 info.major = MAJOR(rdev->bdev->bd_dev);
2525 info.minor = MINOR(rdev->bdev->bd_dev);
2526 info.raid_disk = rdev->raid_disk;
2527 info.state = 0;
b2d444d7 2528 if (test_bit(Faulty, &rdev->flags))
1da177e4 2529 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 2530 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 2531 info.state |= (1<<MD_DISK_ACTIVE);
2532 info.state |= (1<<MD_DISK_SYNC);
2533 }
8ddf9efe
N		 2534 if (test_bit(WriteMostly, &rdev->flags))
2535 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 2536 } else {
2537 info.major = info.minor = 0;
2538 info.raid_disk = -1;
2539 info.state = (1<<MD_DISK_REMOVED);
2540 }
2541
2542 if (copy_to_user(arg, &info, sizeof(info)))
2543 return -EFAULT;
2544
2545 return 0;
2546}
2547
2548static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
2549{
2550 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
2551 mdk_rdev_t *rdev;
2552 dev_t dev = MKDEV(info->major,info->minor);
2553
2554 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
2555 return -EOVERFLOW;
2556
2557 if (!mddev->raid_disks) {
2558 int err;
2559 /* expecting a device which has a superblock */
2560 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
2561 if (IS_ERR(rdev)) {
2562 printk(KERN_WARNING
2563 "md: md_import_device returned %ld\n",
2564 PTR_ERR(rdev));
2565 return PTR_ERR(rdev);
2566 }
2567 if (!list_empty(&mddev->disks)) {
2568 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2569 mdk_rdev_t, same_set);
2570 int err = super_types[mddev->major_version]
2571 .load_super(rdev, rdev0, mddev->minor_version);
2572 if (err < 0) {
2573 printk(KERN_WARNING
2574 "md: %s has different UUID to %s\n",
2575 bdevname(rdev->bdev,b),
2576 bdevname(rdev0->bdev,b2));
2577 export_rdev(rdev);
2578 return -EINVAL;
2579 }
2580 }
2581 err = bind_rdev_to_array(rdev, mddev);
2582 if (err)
2583 export_rdev(rdev);
2584 return err;
2585 }
2586
2587 /*
2588 * add_new_disk can be used once the array is assembled
2589 * to add "hot spares". They must already have a superblock
2590 * written
2591 */
2592 if (mddev->pers) {
2593 int err;
2594 if (!mddev->pers->hot_add_disk) {
2595 printk(KERN_WARNING
2596 "%s: personality does not support diskops!\n",
2597 mdname(mddev));
2598 return -EINVAL;
2599 }
7b1e35f6
N		 2600 if (mddev->persistent)
2601 rdev = md_import_device(dev, mddev->major_version,
2602 mddev->minor_version);
2603 else
2604 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 2605 if (IS_ERR(rdev)) {
2606 printk(KERN_WARNING
2607 "md: md_import_device returned %ld\n",
2608 PTR_ERR(rdev));
2609 return PTR_ERR(rdev);
2610 }
41158c7e
N		 2611 /* set save_raid_disk if appropriate */
2612 if (!mddev->persistent) {
2613 if (info->state & (1<<MD_DISK_SYNC) &&
2614 info->raid_disk < mddev->raid_disks)
2615 rdev->raid_disk = info->raid_disk;
2616 else
2617 rdev->raid_disk = -1;
2618 } else
2619 super_types[mddev->major_version].
2620 validate_super(mddev, rdev);
2621 rdev->saved_raid_disk = rdev->raid_disk;
2622
b2d444d7 2623 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 2624 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
2625 set_bit(WriteMostly, &rdev->flags);
2626
1da177e4
LT		 2627 rdev->raid_disk = -1;
2628 err = bind_rdev_to_array(rdev, mddev);
2629 if (err)
2630 export_rdev(rdev);
c361777f
N		 2631
2632 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 2633 md_wakeup_thread(mddev->thread);
1da177e4
LT		 2634 return err;
2635 }
2636
2637 /* otherwise, add_new_disk is only allowed
2638 * for major_version==0 superblocks
2639 */
2640 if (mddev->major_version != 0) {
2641 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
2642 mdname(mddev));
2643 return -EINVAL;
2644 }
2645
2646 if (!(info->state & (1<<MD_DISK_FAULTY))) {
2647 int err;
2648 rdev = md_import_device (dev, -1, 0);
2649 if (IS_ERR(rdev)) {
2650 printk(KERN_WARNING
2651 "md: error, md_import_device() returned %ld\n",
2652 PTR_ERR(rdev));
2653 return PTR_ERR(rdev);
2654 }
2655 rdev->desc_nr = info->number;
2656 if (info->raid_disk < mddev->raid_disks)
2657 rdev->raid_disk = info->raid_disk;
2658 else
2659 rdev->raid_disk = -1;
2660
b2d444d7
N		 2661 rdev->flags = 0;
2662
1da177e4 2663 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 2664 if (info->state & (1<<MD_DISK_SYNC))
2665 set_bit(In_sync, &rdev->flags);
1da177e4 2666
8ddf9efe
N		 2667 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
2668 set_bit(WriteMostly, &rdev->flags);
2669
1da177e4
LT		 2670 err = bind_rdev_to_array(rdev, mddev);
2671 if (err) {
2672 export_rdev(rdev);
2673 return err;
2674 }
2675
2676 if (!mddev->persistent) {
2677 printk(KERN_INFO "md: nonpersistent superblock ...\n");
2678 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2679 } else
2680 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
2681 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
2682
2683 if (!mddev->size || (mddev->size > rdev->size))
2684 mddev->size = rdev->size;
2685 }
2686
2687 return 0;
2688}
2689
2690static int hot_remove_disk(mddev_t * mddev, dev_t dev)
2691{
2692 char b[BDEVNAME_SIZE];
2693 mdk_rdev_t *rdev;
2694
2695 if (!mddev->pers)
2696 return -ENODEV;
2697
2698 rdev = find_rdev(mddev, dev);
2699 if (!rdev)
2700 return -ENXIO;
2701
2702 if (rdev->raid_disk >= 0)
2703 goto busy;
2704
2705 kick_rdev_from_array(rdev);
2706 md_update_sb(mddev);
2707
2708 return 0;
2709busy:
2710 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
2711 bdevname(rdev->bdev,b), mdname(mddev));
2712 return -EBUSY;
2713}
2714
2715static int hot_add_disk(mddev_t * mddev, dev_t dev)
2716{
2717 char b[BDEVNAME_SIZE];
2718 int err;
2719 unsigned int size;
2720 mdk_rdev_t *rdev;
2721
2722 if (!mddev->pers)
2723 return -ENODEV;
2724
2725 if (mddev->major_version != 0) {
2726 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
2727 " version-0 superblocks.\n",
2728 mdname(mddev));
2729 return -EINVAL;
2730 }
2731 if (!mddev->pers->hot_add_disk) {
2732 printk(KERN_WARNING
2733 "%s: personality does not support diskops!\n",
2734 mdname(mddev));
2735 return -EINVAL;
2736 }
2737
2738 rdev = md_import_device (dev, -1, 0);
2739 if (IS_ERR(rdev)) {
2740 printk(KERN_WARNING
2741 "md: error, md_import_device() returned %ld\n",
2742 PTR_ERR(rdev));
2743 return -EINVAL;
2744 }
2745
2746 if (mddev->persistent)
2747 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
2748 else
2749 rdev->sb_offset =
2750 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2751
2752 size = calc_dev_size(rdev, mddev->chunk_size);
2753 rdev->size = size;
2754
2755 if (size < mddev->size) {
2756 printk(KERN_WARNING
2757 "%s: disk size %llu blocks < array size %llu\n",
2758 mdname(mddev), (unsigned long long)size,
2759 (unsigned long long)mddev->size);
2760 err = -ENOSPC;
2761 goto abort_export;
2762 }
2763
b2d444d7 2764 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 2765 printk(KERN_WARNING
2766 "md: can not hot-add faulty %s disk to %s!\n",
2767 bdevname(rdev->bdev,b), mdname(mddev));
2768 err = -EINVAL;
2769 goto abort_export;
2770 }
b2d444d7 2771 clear_bit(In_sync, &rdev->flags);
1da177e4
LT		 2772 rdev->desc_nr = -1;
2773 bind_rdev_to_array(rdev, mddev);
2774
2775 /*
2776 * The rest should better be atomic, we can have disk failures
2777 * noticed in interrupt contexts ...
2778 */
2779
2780 if (rdev->desc_nr == mddev->max_disks) {
2781 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
2782 mdname(mddev));
2783 err = -EBUSY;
2784 goto abort_unbind_export;
2785 }
2786
2787 rdev->raid_disk = -1;
2788
2789 md_update_sb(mddev);
2790
2791 /*
2792 * Kick recovery, maybe this spare has to be added to the
2793 * array immediately.
2794 */
2795 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2796 md_wakeup_thread(mddev->thread);
2797
2798 return 0;
2799
2800abort_unbind_export:
2801 unbind_rdev_from_array(rdev);
2802
2803abort_export:
2804 export_rdev(rdev);
2805 return err;
2806}
2807
32a7627c
N		 2808/* similar to deny_write_access, but accounts for our holding a reference
2809 * to the file ourselves */
2810static int deny_bitmap_write_access(struct file * file)
2811{
2812 struct inode *inode = file->f_mapping->host;
2813
2814 spin_lock(&inode->i_lock);
2815 if (atomic_read(&inode->i_writecount) > 1) {
2816 spin_unlock(&inode->i_lock);
2817 return -ETXTBSY;
2818 }
2819 atomic_set(&inode->i_writecount, -1);
2820 spin_unlock(&inode->i_lock);
2821
2822 return 0;
2823}
2824
2825static int set_bitmap_file(mddev_t *mddev, int fd)
2826{
2827 int err;
2828
36fa3063
N		 2829 if (mddev->pers) {
2830 if (!mddev->pers->quiesce)
2831 return -EBUSY;
2832 if (mddev->recovery || mddev->sync_thread)
2833 return -EBUSY;
2834 /* we should be able to change the bitmap.. */
2835 }
32a7627c 2836
32a7627c 2837
36fa3063
N		 2838 if (fd >= 0) {
2839 if (mddev->bitmap)
2840 return -EEXIST; /* cannot add when bitmap is present */
2841 mddev->bitmap_file = fget(fd);
32a7627c 2842
36fa3063
N		 2843 if (mddev->bitmap_file == NULL) {
2844 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
2845 mdname(mddev));
2846 return -EBADF;
2847 }
2848
2849 err = deny_bitmap_write_access(mddev->bitmap_file);
2850 if (err) {
2851 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
2852 mdname(mddev));
2853 fput(mddev->bitmap_file);
2854 mddev->bitmap_file = NULL;
2855 return err;
2856 }
a654b9d8 2857 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 2858 } else if (mddev->bitmap == NULL)
2859 return -ENOENT; /* cannot remove what isn't there */
2860 err = 0;
2861 if (mddev->pers) {
2862 mddev->pers->quiesce(mddev, 1);
2863 if (fd >= 0)
2864 err = bitmap_create(mddev);
2865 if (fd < 0 || err)
2866 bitmap_destroy(mddev);
2867 mddev->pers->quiesce(mddev, 0);
2868 } else if (fd < 0) {
2869 if (mddev->bitmap_file)
2870 fput(mddev->bitmap_file);
2871 mddev->bitmap_file = NULL;
2872 }
2873
32a7627c
N		 2874 return err;
2875}
2876
1da177e4
LT		 2877/*
2878 * set_array_info is used two different ways
2879 * The original usage is when creating a new array.
2880 * In this usage, raid_disks is > 0 and it together with
2881 * level, size, not_persistent,layout,chunksize determine the
2882 * shape of the array.
2883 * This will always create an array with a type-0.90.0 superblock.
2884 * The newer usage is when assembling an array.
2885 * In this case raid_disks will be 0, and the major_version field is
2886 * use to determine which style super-blocks are to be found on the devices.
2887 * The minor and patch _version numbers are also kept incase the
2888 * super_block handler wishes to interpret them.
2889 */
2890static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
2891{
2892
2893 if (info->raid_disks == 0) {
2894 /* just setting version number for superblock loading */
2895 if (info->major_version < 0 ||
2896 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
2897 super_types[info->major_version].name == NULL) {
2898 /* maybe try to auto-load a module? */
2899 printk(KERN_INFO
2900 "md: superblock version %d not known\n",
2901 info->major_version);
2902 return -EINVAL;
2903 }
2904 mddev->major_version = info->major_version;
2905 mddev->minor_version = info->minor_version;
2906 mddev->patch_version = info->patch_version;
2907 return 0;
2908 }
2909 mddev->major_version = MD_MAJOR_VERSION;
2910 mddev->minor_version = MD_MINOR_VERSION;
2911 mddev->patch_version = MD_PATCHLEVEL_VERSION;
2912 mddev->ctime = get_seconds();
2913
2914 mddev->level = info->level;
2915 mddev->size = info->size;
2916 mddev->raid_disks = info->raid_disks;
2917 /* don't set md_minor, it is determined by which /dev/md* was
2918 * openned
2919 */
2920 if (info->state & (1<<MD_SB_CLEAN))
2921 mddev->recovery_cp = MaxSector;
2922 else
2923 mddev->recovery_cp = 0;
2924 mddev->persistent = ! info->not_persistent;
2925
2926 mddev->layout = info->layout;
2927 mddev->chunk_size = info->chunk_size;
2928
2929 mddev->max_disks = MD_SB_DISKS;
2930
2931 mddev->sb_dirty = 1;
2932
2933 /*
2934 * Generate a 128 bit UUID
2935 */
2936 get_random_bytes(mddev->uuid, 16);
2937
2938 return 0;
2939}
2940
2941/*
2942 * update_array_info is used to change the configuration of an
2943 * on-line array.
2944 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
2945 * fields in the info are checked against the array.
2946 * Any differences that cannot be handled will cause an error.
2947 * Normally, only one change can be managed at a time.
2948 */
2949static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
2950{
2951 int rv = 0;
2952 int cnt = 0;
36fa3063
N		 2953 int state = 0;
2954
2955 /* calculate expected state,ignoring low bits */
2956 if (mddev->bitmap && mddev->bitmap_offset)
2957 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 2958
2959 if (mddev->major_version != info->major_version ||
2960 mddev->minor_version != info->minor_version ||
2961/* mddev->patch_version != info->patch_version || */
2962 mddev->ctime != info->ctime ||
2963 mddev->level != info->level ||
2964/* mddev->layout != info->layout || */
2965 !mddev->persistent != info->not_persistent||
36fa3063
N		 2966 mddev->chunk_size != info->chunk_size ||
2967 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
2968 ((state^info->state) & 0xfffffe00)
2969 )
1da177e4
LT		 2970 return -EINVAL;
2971 /* Check there is only one change */
2972 if (mddev->size != info->size) cnt++;
2973 if (mddev->raid_disks != info->raid_disks) cnt++;
2974 if (mddev->layout != info->layout) cnt++;
36fa3063 2975 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 2976 if (cnt == 0) return 0;
2977 if (cnt > 1) return -EINVAL;
2978
2979 if (mddev->layout != info->layout) {
2980 /* Change layout
2981 * we don't need to do anything at the md level, the
2982 * personality will take care of it all.
2983 */
2984 if (mddev->pers->reconfig == NULL)
2985 return -EINVAL;
2986 else
2987 return mddev->pers->reconfig(mddev, info->layout, -1);
2988 }
2989 if (mddev->size != info->size) {
2990 mdk_rdev_t * rdev;
2991 struct list_head *tmp;
2992 if (mddev->pers->resize == NULL)
2993 return -EINVAL;
2994 /* The "size" is the amount of each device that is used.
2995 * This can only make sense for arrays with redundancy.
2996 * linear and raid0 always use whatever space is available
2997 * We can only consider changing the size if no resync
2998 * or reconstruction is happening, and if the new size
2999 * is acceptable. It must fit before the sb_offset or,
3000 * if that is <data_offset, it must fit before the
3001 * size of each device.
3002 * If size is zero, we find the largest size that fits.
3003 */
3004 if (mddev->sync_thread)
3005 return -EBUSY;
3006 ITERATE_RDEV(mddev,rdev,tmp) {
3007 sector_t avail;
3008 int fit = (info->size == 0);
3009 if (rdev->sb_offset > rdev->data_offset)
3010 avail = (rdev->sb_offset*2) - rdev->data_offset;
3011 else
3012 avail = get_capacity(rdev->bdev->bd_disk)
3013 - rdev->data_offset;
3014 if (fit && (info->size == 0 || info->size > avail/2))
3015 info->size = avail/2;
3016 if (avail < ((sector_t)info->size << 1))
3017 return -ENOSPC;
3018 }
3019 rv = mddev->pers->resize(mddev, (sector_t)info->size *2);
3020 if (!rv) {
3021 struct block_device *bdev;
3022
3023 bdev = bdget_disk(mddev->gendisk, 0);
3024 if (bdev) {
3025 down(&bdev->bd_inode->i_sem);
3026 i_size_write(bdev->bd_inode, mddev->array_size << 10);
3027 up(&bdev->bd_inode->i_sem);
3028 bdput(bdev);
3029 }
3030 }
3031 }
3032 if (mddev->raid_disks != info->raid_disks) {
3033 /* change the number of raid disks */
3034 if (mddev->pers->reshape == NULL)
3035 return -EINVAL;
3036 if (info->raid_disks <= 0 ||
3037 info->raid_disks >= mddev->max_disks)
3038 return -EINVAL;
3039 if (mddev->sync_thread)
3040 return -EBUSY;
3041 rv = mddev->pers->reshape(mddev, info->raid_disks);
3042 if (!rv) {
3043 struct block_device *bdev;
3044
3045 bdev = bdget_disk(mddev->gendisk, 0);
3046 if (bdev) {
3047 down(&bdev->bd_inode->i_sem);
3048 i_size_write(bdev->bd_inode, mddev->array_size << 10);
3049 up(&bdev->bd_inode->i_sem);
3050 bdput(bdev);
3051 }
3052 }
3053 }
36fa3063
N		 3054 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
3055 if (mddev->pers->quiesce == NULL)
3056 return -EINVAL;
3057 if (mddev->recovery || mddev->sync_thread)
3058 return -EBUSY;
3059 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
3060 /* add the bitmap */
3061 if (mddev->bitmap)
3062 return -EEXIST;
3063 if (mddev->default_bitmap_offset == 0)
3064 return -EINVAL;
3065 mddev->bitmap_offset = mddev->default_bitmap_offset;
3066 mddev->pers->quiesce(mddev, 1);
3067 rv = bitmap_create(mddev);
3068 if (rv)
3069 bitmap_destroy(mddev);
3070 mddev->pers->quiesce(mddev, 0);
3071 } else {
3072 /* remove the bitmap */
3073 if (!mddev->bitmap)
3074 return -ENOENT;
3075 if (mddev->bitmap->file)
3076 return -EINVAL;
3077 mddev->pers->quiesce(mddev, 1);
3078 bitmap_destroy(mddev);
3079 mddev->pers->quiesce(mddev, 0);
3080 mddev->bitmap_offset = 0;
3081 }
3082 }
1da177e4
LT		 3083 md_update_sb(mddev);
3084 return rv;
3085}
3086
3087static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3088{
3089 mdk_rdev_t *rdev;
3090
3091 if (mddev->pers == NULL)
3092 return -ENODEV;
3093
3094 rdev = find_rdev(mddev, dev);
3095 if (!rdev)
3096 return -ENODEV;
3097
3098 md_error(mddev, rdev);
3099 return 0;
3100}
3101
3102static int md_ioctl(struct inode *inode, struct file *file,
3103 unsigned int cmd, unsigned long arg)
3104{
3105 int err = 0;
3106 void __user *argp = (void __user *)arg;
3107 struct hd_geometry __user *loc = argp;
3108 mddev_t *mddev = NULL;
3109
3110 if (!capable(CAP_SYS_ADMIN))
3111 return -EACCES;
3112
3113 /*
3114 * Commands dealing with the RAID driver but not any
3115 * particular array:
3116 */
3117 switch (cmd)
3118 {
3119 case RAID_VERSION:
3120 err = get_version(argp);
3121 goto done;
3122
3123 case PRINT_RAID_DEBUG:
3124 err = 0;
3125 md_print_devices();
3126 goto done;
3127
3128#ifndef MODULE
3129 case RAID_AUTORUN:
3130 err = 0;
3131 autostart_arrays(arg);
3132 goto done;
3133#endif
3134 default:;
3135 }
3136
3137 /*
3138 * Commands creating/starting a new array:
3139 */
3140
3141 mddev = inode->i_bdev->bd_disk->private_data;
3142
3143 if (!mddev) {
3144 BUG();
3145 goto abort;
3146 }
3147
3148
3149 if (cmd == START_ARRAY) {
3150 /* START_ARRAY doesn't need to lock the array as autostart_array
3151 * does the locking, and it could even be a different array
3152 */
3153 static int cnt = 3;
3154 if (cnt > 0 ) {
3155 printk(KERN_WARNING
3156 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
3157 "This will not be supported beyond 2.6\n",
3158 current->comm, current->pid);
3159 cnt--;
3160 }
3161 err = autostart_array(new_decode_dev(arg));
3162 if (err) {
3163 printk(KERN_WARNING "md: autostart failed!\n");
3164 goto abort;
3165 }
3166 goto done;
3167 }
3168
3169 err = mddev_lock(mddev);
3170 if (err) {
3171 printk(KERN_INFO
3172 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3173 err, cmd);
3174 goto abort;
3175 }
3176
3177 switch (cmd)
3178 {
3179 case SET_ARRAY_INFO:
3180 {
3181 mdu_array_info_t info;
3182 if (!arg)
3183 memset(&info, 0, sizeof(info));
3184 else if (copy_from_user(&info, argp, sizeof(info))) {
3185 err = -EFAULT;
3186 goto abort_unlock;
3187 }
3188 if (mddev->pers) {
3189 err = update_array_info(mddev, &info);
3190 if (err) {
3191 printk(KERN_WARNING "md: couldn't update"
3192 " array info. %d\n", err);
3193 goto abort_unlock;
3194 }
3195 goto done_unlock;
3196 }
3197 if (!list_empty(&mddev->disks)) {
3198 printk(KERN_WARNING
3199 "md: array %s already has disks!\n",
3200 mdname(mddev));
3201 err = -EBUSY;
3202 goto abort_unlock;
3203 }
3204 if (mddev->raid_disks) {
3205 printk(KERN_WARNING
3206 "md: array %s already initialised!\n",
3207 mdname(mddev));
3208 err = -EBUSY;
3209 goto abort_unlock;
3210 }
3211 err = set_array_info(mddev, &info);
3212 if (err) {
3213 printk(KERN_WARNING "md: couldn't set"
3214 " array info. %d\n", err);
3215 goto abort_unlock;
3216 }
3217 }
3218 goto done_unlock;
3219
3220 default:;
3221 }
3222
3223 /*
3224 * Commands querying/configuring an existing array:
3225 */
32a7627c
N		 3226 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3227 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3228 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3229 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
1da177e4
LT		 3230 err = -ENODEV;
3231 goto abort_unlock;
3232 }
3233
3234 /*
3235 * Commands even a read-only array can execute:
3236 */
3237 switch (cmd)
3238 {
3239 case GET_ARRAY_INFO:
3240 err = get_array_info(mddev, argp);
3241 goto done_unlock;
3242
32a7627c 3243 case GET_BITMAP_FILE:
87162a28 3244 err = get_bitmap_file(mddev, argp);
32a7627c
N		 3245 goto done_unlock;
3246
1da177e4
LT		 3247 case GET_DISK_INFO:
3248 err = get_disk_info(mddev, argp);
3249 goto done_unlock;
3250
3251 case RESTART_ARRAY_RW:
3252 err = restart_array(mddev);
3253 goto done_unlock;
3254
3255 case STOP_ARRAY:
3256 err = do_md_stop (mddev, 0);
3257 goto done_unlock;
3258
3259 case STOP_ARRAY_RO:
3260 err = do_md_stop (mddev, 1);
3261 goto done_unlock;
3262
3263 /*
3264 * We have a problem here : there is no easy way to give a CHS
3265 * virtual geometry. We currently pretend that we have a 2 heads
3266 * 4 sectors (with a BIG number of cylinders...). This drives
3267 * dosfs just mad... ;-)
3268 */
3269 case HDIO_GETGEO:
3270 if (!loc) {
3271 err = -EINVAL;
3272 goto abort_unlock;
3273 }
3274 err = put_user (2, (char __user *) &loc->heads);
3275 if (err)
3276 goto abort_unlock;
3277 err = put_user (4, (char __user *) &loc->sectors);
3278 if (err)
3279 goto abort_unlock;
3280 err = put_user(get_capacity(mddev->gendisk)/8,
3281 (short __user *) &loc->cylinders);
3282 if (err)
3283 goto abort_unlock;
3284 err = put_user (get_start_sect(inode->i_bdev),
3285 (long __user *) &loc->start);
3286 goto done_unlock;
3287 }
3288
3289 /*
3290 * The remaining ioctls are changing the state of the
f91de92e
N		 3291 * superblock, so we do not allow them on read-only arrays.
3292 * However non-MD ioctls (e.g. get-size) will still come through
3293 * here and hit the 'default' below, so only disallow
3294 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 3295 */
f91de92e
N		 3296 if (_IOC_TYPE(cmd) == MD_MAJOR &&
3297 mddev->ro && mddev->pers) {
3298 if (mddev->ro == 2) {
3299 mddev->ro = 0;
3300 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3301 md_wakeup_thread(mddev->thread);
3302
3303 } else {
3304 err = -EROFS;
3305 goto abort_unlock;
3306 }
1da177e4
LT		 3307 }
3308
3309 switch (cmd)
3310 {
3311 case ADD_NEW_DISK:
3312 {
3313 mdu_disk_info_t info;
3314 if (copy_from_user(&info, argp, sizeof(info)))
3315 err = -EFAULT;
3316 else
3317 err = add_new_disk(mddev, &info);
3318 goto done_unlock;
3319 }
3320
3321 case HOT_REMOVE_DISK:
3322 err = hot_remove_disk(mddev, new_decode_dev(arg));
3323 goto done_unlock;
3324
3325 case HOT_ADD_DISK:
3326 err = hot_add_disk(mddev, new_decode_dev(arg));
3327 goto done_unlock;
3328
3329 case SET_DISK_FAULTY:
3330 err = set_disk_faulty(mddev, new_decode_dev(arg));
3331 goto done_unlock;
3332
3333 case RUN_ARRAY:
3334 err = do_md_run (mddev);
3335 goto done_unlock;
3336
32a7627c
N		 3337 case SET_BITMAP_FILE:
3338 err = set_bitmap_file(mddev, (int)arg);
3339 goto done_unlock;
3340
1da177e4
LT		 3341 default:
3342 if (_IOC_TYPE(cmd) == MD_MAJOR)
3343 printk(KERN_WARNING "md: %s(pid %d) used"
3344 " obsolete MD ioctl, upgrade your"
3345 " software to use new ictls.\n",
3346 current->comm, current->pid);
3347 err = -EINVAL;
3348 goto abort_unlock;
3349 }
3350
3351done_unlock:
3352abort_unlock:
3353 mddev_unlock(mddev);
3354
3355 return err;
3356done:
3357 if (err)
3358 MD_BUG();
3359abort:
3360 return err;
3361}
3362
3363static int md_open(struct inode *inode, struct file *file)
3364{
3365 /*
3366 * Succeed if we can lock the mddev, which confirms that
3367 * it isn't being stopped right now.
3368 */
3369 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3370 int err;
3371
3372 if ((err = mddev_lock(mddev)))
3373 goto out;
3374
3375 err = 0;
3376 mddev_get(mddev);
3377 mddev_unlock(mddev);
3378
3379 check_disk_change(inode->i_bdev);
3380 out:
3381 return err;
3382}
3383
3384static int md_release(struct inode *inode, struct file * file)
3385{
3386 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3387
3388 if (!mddev)
3389 BUG();
3390 mddev_put(mddev);
3391
3392 return 0;
3393}
3394
3395static int md_media_changed(struct gendisk *disk)
3396{
3397 mddev_t *mddev = disk->private_data;
3398
3399 return mddev->changed;
3400}
3401
3402static int md_revalidate(struct gendisk *disk)
3403{
3404 mddev_t *mddev = disk->private_data;
3405
3406 mddev->changed = 0;
3407 return 0;
3408}
3409static struct block_device_operations md_fops =
3410{
3411 .owner = THIS_MODULE,
3412 .open = md_open,
3413 .release = md_release,
3414 .ioctl = md_ioctl,
3415 .media_changed = md_media_changed,
3416 .revalidate_disk= md_revalidate,
3417};
3418
75c96f85 3419static int md_thread(void * arg)
1da177e4
LT		 3420{
3421 mdk_thread_t *thread = arg;
3422
1da177e4
LT		 3423 /*
3424 * md_thread is a 'system-thread', it's priority should be very
3425 * high. We avoid resource deadlocks individually in each
3426 * raid personality. (RAID5 does preallocation) We also use RR and
3427 * the very same RT priority as kswapd, thus we will never get
3428 * into a priority inversion deadlock.
3429 *
3430 * we definitely have to have equal or higher priority than
3431 * bdflush, otherwise bdflush will deadlock if there are too
3432 * many dirty RAID5 blocks.
3433 */
1da177e4 3434
6985c43f 3435 allow_signal(SIGKILL);
a6fb0934 3436 while (!kthread_should_stop()) {
1da177e4 3437
787453c2
N		 3438 wait_event_timeout(thread->wqueue,
3439 test_bit(THREAD_WAKEUP, &thread->flags)
3440 || kthread_should_stop(),
3441 thread->timeout);
3e1d1d28 3442 try_to_freeze();
1da177e4
LT		 3443
3444 clear_bit(THREAD_WAKEUP, &thread->flags);
3445
787453c2 3446 thread->run(thread->mddev);
1da177e4 3447 }
a6fb0934 3448
1da177e4
LT		 3449 return 0;
3450}
3451
3452void md_wakeup_thread(mdk_thread_t *thread)
3453{
3454 if (thread) {
3455 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
3456 set_bit(THREAD_WAKEUP, &thread->flags);
3457 wake_up(&thread->wqueue);
3458 }
3459}
3460
3461mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
3462 const char *name)
3463{
3464 mdk_thread_t *thread;
1da177e4 3465
a6fb0934 3466 thread = kmalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 3467 if (!thread)
3468 return NULL;
3469
3470 memset(thread, 0, sizeof(mdk_thread_t));
3471 init_waitqueue_head(&thread->wqueue);
3472
1da177e4
LT		 3473 thread->run = run;
3474 thread->mddev = mddev;
32a7627c 3475 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 3476 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 3477 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 3478 kfree(thread);
3479 return NULL;
3480 }
1da177e4
LT		 3481 return thread;
3482}
3483
1da177e4
LT		 3484void md_unregister_thread(mdk_thread_t *thread)
3485{
d28446fe 3486 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
a6fb0934
N		 3487
3488 kthread_stop(thread->tsk);
1da177e4
LT		 3489 kfree(thread);
3490}
3491
3492void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
3493{
3494 if (!mddev) {
3495 MD_BUG();
3496 return;
3497 }
3498
b2d444d7 3499 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 3500 return;
32a7627c 3501/*
1da177e4
LT		 3502 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
3503 mdname(mddev),
3504 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
3505 __builtin_return_address(0),__builtin_return_address(1),
3506 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 3507*/
1da177e4
LT		 3508 if (!mddev->pers->error_handler)
3509 return;
3510 mddev->pers->error_handler(mddev,rdev);
3511 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3512 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3513 md_wakeup_thread(mddev->thread);
3514}
3515
3516/* seq_file implementation /proc/mdstat */
3517
3518static void status_unused(struct seq_file *seq)
3519{
3520 int i = 0;
3521 mdk_rdev_t *rdev;
3522 struct list_head *tmp;
3523
3524 seq_printf(seq, "unused devices: ");
3525
3526 ITERATE_RDEV_PENDING(rdev,tmp) {
3527 char b[BDEVNAME_SIZE];
3528 i++;
3529 seq_printf(seq, "%s ",
3530 bdevname(rdev->bdev,b));
3531 }
3532 if (!i)
3533 seq_printf(seq, "<none>");
3534
3535 seq_printf(seq, "\n");
3536}
3537
3538
3539static void status_resync(struct seq_file *seq, mddev_t * mddev)
3540{
3541 unsigned long max_blocks, resync, res, dt, db, rt;
3542
3543 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
3544
3545 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3546 max_blocks = mddev->resync_max_sectors >> 1;
3547 else
3548 max_blocks = mddev->size;
3549
3550 /*
3551 * Should not happen.
3552 */
3553 if (!max_blocks) {
3554 MD_BUG();
3555 return;
3556 }
3557 res = (resync/1024)*1000/(max_blocks/1024 + 1);
3558 {
3559 int i, x = res/50, y = 20-x;
3560 seq_printf(seq, "[");
3561 for (i = 0; i < x; i++)
3562 seq_printf(seq, "=");
3563 seq_printf(seq, ">");
3564 for (i = 0; i < y; i++)
3565 seq_printf(seq, ".");
3566 seq_printf(seq, "] ");
3567 }
3568 seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)",
3569 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
3570 "resync" : "recovery"),
3571 res/10, res % 10, resync, max_blocks);
3572
3573 /*
3574 * We do not want to overflow, so the order of operands and
3575 * the * 100 / 100 trick are important. We do a +1 to be
3576 * safe against division by zero. We only estimate anyway.
3577 *
3578 * dt: time from mark until now
3579 * db: blocks written from mark until now
3580 * rt: remaining time
3581 */
3582 dt = ((jiffies - mddev->resync_mark) / HZ);
3583 if (!dt) dt++;
3584 db = resync - (mddev->resync_mark_cnt/2);
3585 rt = (dt * ((max_blocks-resync) / (db/100+1)))/100;
3586
3587 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
3588
3589 seq_printf(seq, " speed=%ldK/sec", db/dt);
3590}
3591
3592static void *md_seq_start(struct seq_file *seq, loff_t *pos)
3593{
3594 struct list_head *tmp;
3595 loff_t l = *pos;
3596 mddev_t *mddev;
3597
3598 if (l >= 0x10000)
3599 return NULL;
3600 if (!l--)
3601 /* header */
3602 return (void*)1;
3603
3604 spin_lock(&all_mddevs_lock);
3605 list_for_each(tmp,&all_mddevs)
3606 if (!l--) {
3607 mddev = list_entry(tmp, mddev_t, all_mddevs);
3608 mddev_get(mddev);
3609 spin_unlock(&all_mddevs_lock);
3610 return mddev;
3611 }
3612 spin_unlock(&all_mddevs_lock);
3613 if (!l--)
3614 return (void*)2;/* tail */
3615 return NULL;
3616}
3617
3618static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3619{
3620 struct list_head *tmp;
3621 mddev_t *next_mddev, *mddev = v;
3622
3623 ++*pos;
3624 if (v == (void*)2)
3625 return NULL;
3626
3627 spin_lock(&all_mddevs_lock);
3628 if (v == (void*)1)
3629 tmp = all_mddevs.next;
3630 else
3631 tmp = mddev->all_mddevs.next;
3632 if (tmp != &all_mddevs)
3633 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
3634 else {
3635 next_mddev = (void*)2;
3636 *pos = 0x10000;
3637 }
3638 spin_unlock(&all_mddevs_lock);
3639
3640 if (v != (void*)1)
3641 mddev_put(mddev);
3642 return next_mddev;
3643
3644}
3645
3646static void md_seq_stop(struct seq_file *seq, void *v)
3647{
3648 mddev_t *mddev = v;
3649
3650 if (mddev && v != (void*)1 && v != (void*)2)
3651 mddev_put(mddev);
3652}
3653
3654static int md_seq_show(struct seq_file *seq, void *v)
3655{
3656 mddev_t *mddev = v;
3657 sector_t size;
3658 struct list_head *tmp2;
3659 mdk_rdev_t *rdev;
3660 int i;
32a7627c 3661 struct bitmap *bitmap;
1da177e4
LT		 3662
3663 if (v == (void*)1) {
3664 seq_printf(seq, "Personalities : ");
3665 spin_lock(&pers_lock);
3666 for (i = 0; i < MAX_PERSONALITY; i++)
3667 if (pers[i])
3668 seq_printf(seq, "[%s] ", pers[i]->name);
3669
3670 spin_unlock(&pers_lock);
3671 seq_printf(seq, "\n");
3672 return 0;
3673 }
3674 if (v == (void*)2) {
3675 status_unused(seq);
3676 return 0;
3677 }
3678
3679 if (mddev_lock(mddev)!=0)
3680 return -EINTR;
3681 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
3682 seq_printf(seq, "%s : %sactive", mdname(mddev),
3683 mddev->pers ? "" : "in");
3684 if (mddev->pers) {
f91de92e 3685 if (mddev->ro==1)
1da177e4 3686 seq_printf(seq, " (read-only)");
f91de92e
N		 3687 if (mddev->ro==2)
3688 seq_printf(seq, "(auto-read-only)");
1da177e4
LT		 3689 seq_printf(seq, " %s", mddev->pers->name);
3690 }
3691
3692 size = 0;
3693 ITERATE_RDEV(mddev,rdev,tmp2) {
3694 char b[BDEVNAME_SIZE];
3695 seq_printf(seq, " %s[%d]",
3696 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 3697 if (test_bit(WriteMostly, &rdev->flags))
3698 seq_printf(seq, "(W)");
b2d444d7 3699 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 3700 seq_printf(seq, "(F)");
3701 continue;
b325a32e
N		 3702 } else if (rdev->raid_disk < 0)
3703 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 3704 size += rdev->size;
3705 }
3706
3707 if (!list_empty(&mddev->disks)) {
3708 if (mddev->pers)
3709 seq_printf(seq, "\n %llu blocks",
3710 (unsigned long long)mddev->array_size);
3711 else
3712 seq_printf(seq, "\n %llu blocks",
3713 (unsigned long long)size);
3714 }
1cd6bf19
N		 3715 if (mddev->persistent) {
3716 if (mddev->major_version != 0 ||
3717 mddev->minor_version != 90) {
3718 seq_printf(seq," super %d.%d",
3719 mddev->major_version,
3720 mddev->minor_version);
3721 }
3722 } else
3723 seq_printf(seq, " super non-persistent");
1da177e4
LT		 3724
3725 if (mddev->pers) {
3726 mddev->pers->status (seq, mddev);
3727 seq_printf(seq, "\n ");
8e1b39d6
N		 3728 if (mddev->pers->sync_request) {
3729 if (mddev->curr_resync > 2) {
3730 status_resync (seq, mddev);
3731 seq_printf(seq, "\n ");
3732 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
3733 seq_printf(seq, "\tresync=DELAYED\n ");
3734 else if (mddev->recovery_cp < MaxSector)
3735 seq_printf(seq, "\tresync=PENDING\n ");
3736 }
32a7627c
N		 3737 } else
3738 seq_printf(seq, "\n ");
3739
3740 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 3741 unsigned long chunk_kb;
3742 unsigned long flags;
32a7627c
N		 3743 spin_lock_irqsave(&bitmap->lock, flags);
3744 chunk_kb = bitmap->chunksize >> 10;
3745 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
3746 "%lu%s chunk",
3747 bitmap->pages - bitmap->missing_pages,
3748 bitmap->pages,
3749 (bitmap->pages - bitmap->missing_pages)
3750 << (PAGE_SHIFT - 10),
3751 chunk_kb ? chunk_kb : bitmap->chunksize,
3752 chunk_kb ? "KB" : "B");
78d742d8
N		 3753 if (bitmap->file) {
3754 seq_printf(seq, ", file: ");
3755 seq_path(seq, bitmap->file->f_vfsmnt,
3756 bitmap->file->f_dentry," \t\n");
32a7627c 3757 }
78d742d8 3758
32a7627c
N		 3759 seq_printf(seq, "\n");
3760 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 3761 }
3762
3763 seq_printf(seq, "\n");
3764 }
3765 mddev_unlock(mddev);
3766
3767 return 0;
3768}
3769
3770static struct seq_operations md_seq_ops = {
3771 .start = md_seq_start,
3772 .next = md_seq_next,
3773 .stop = md_seq_stop,
3774 .show = md_seq_show,
3775};
3776
3777static int md_seq_open(struct inode *inode, struct file *file)
3778{
3779 int error;
3780
3781 error = seq_open(file, &md_seq_ops);
3782 return error;
3783}
3784
3785static struct file_operations md_seq_fops = {
3786 .open = md_seq_open,
3787 .read = seq_read,
3788 .llseek = seq_lseek,
3789 .release = seq_release,
3790};
3791
3792int register_md_personality(int pnum, mdk_personality_t *p)
3793{
3794 if (pnum >= MAX_PERSONALITY) {
3795 printk(KERN_ERR
3796 "md: tried to install personality %s as nr %d, but max is %lu\n",
3797 p->name, pnum, MAX_PERSONALITY-1);
3798 return -EINVAL;
3799 }
3800
3801 spin_lock(&pers_lock);
3802 if (pers[pnum]) {
3803 spin_unlock(&pers_lock);
1da177e4
LT		 3804 return -EBUSY;
3805 }
3806
3807 pers[pnum] = p;
3808 printk(KERN_INFO "md: %s personality registered as nr %d\n", p->name, pnum);
3809 spin_unlock(&pers_lock);
3810 return 0;
3811}
3812
3813int unregister_md_personality(int pnum)
3814{
a757e64c 3815 if (pnum >= MAX_PERSONALITY)
1da177e4 3816 return -EINVAL;
1da177e4
LT		 3817
3818 printk(KERN_INFO "md: %s personality unregistered\n", pers[pnum]->name);
3819 spin_lock(&pers_lock);
3820 pers[pnum] = NULL;
3821 spin_unlock(&pers_lock);
3822 return 0;
3823}
3824
3825static int is_mddev_idle(mddev_t *mddev)
3826{
3827 mdk_rdev_t * rdev;
3828 struct list_head *tmp;
3829 int idle;
3830 unsigned long curr_events;
3831
3832 idle = 1;
3833 ITERATE_RDEV(mddev,rdev,tmp) {
3834 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 3835 curr_events = disk_stat_read(disk, sectors[0]) +
3836 disk_stat_read(disk, sectors[1]) -
1da177e4
LT		 3837 atomic_read(&disk->sync_io);
3838 /* Allow some slack between valud of curr_events and last_events,
3839 * as there are some uninteresting races.
3840 * Note: the following is an unsigned comparison.
3841 */
3842 if ((curr_events - rdev->last_events + 32) > 64) {
3843 rdev->last_events = curr_events;
3844 idle = 0;
3845 }
3846 }
3847 return idle;
3848}
3849
3850void md_done_sync(mddev_t *mddev, int blocks, int ok)
3851{
3852 /* another "blocks" (512byte) blocks have been synced */
3853 atomic_sub(blocks, &mddev->recovery_active);
3854 wake_up(&mddev->recovery_wait);
3855 if (!ok) {
3856 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
3857 md_wakeup_thread(mddev->thread);
3858 // stop recovery, signal do_sync ....
3859 }
3860}
3861
3862
06d91a5f
N		 3863/* md_write_start(mddev, bi)
3864 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 3865 * in superblock) before writing, schedule a superblock update
3866 * and wait for it to complete.
06d91a5f 3867 */
3d310eb7 3868void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 3869{
06d91a5f 3870 if (bio_data_dir(bi) != WRITE)
3d310eb7 3871 return;
06d91a5f 3872
f91de92e
N		 3873 BUG_ON(mddev->ro == 1);
3874 if (mddev->ro == 2) {
3875 /* need to switch to read/write */
3876 mddev->ro = 0;
3877 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3878 md_wakeup_thread(mddev->thread);
3879 }
06d91a5f 3880 atomic_inc(&mddev->writes_pending);
06d91a5f 3881 if (mddev->in_sync) {
a9701a30 3882 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 3883 if (mddev->in_sync) {
3884 mddev->in_sync = 0;
3885 mddev->sb_dirty = 1;
3886 md_wakeup_thread(mddev->thread);
3887 }
a9701a30 3888 spin_unlock_irq(&mddev->write_lock);
06d91a5f 3889 }
3d310eb7 3890 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
1da177e4
LT		 3891}
3892
3893void md_write_end(mddev_t *mddev)
3894{
3895 if (atomic_dec_and_test(&mddev->writes_pending)) {
3896 if (mddev->safemode == 2)
3897 md_wakeup_thread(mddev->thread);
3898 else
3899 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
3900 }
3901}
3902
75c96f85 3903static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
1da177e4
LT		 3904
3905#define SYNC_MARKS 10
3906#define SYNC_MARK_STEP (3*HZ)
3907static void md_do_sync(mddev_t *mddev)
3908{
3909 mddev_t *mddev2;
3910 unsigned int currspeed = 0,
3911 window;
57afd89f 3912 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 3913 unsigned long mark[SYNC_MARKS];
3914 sector_t mark_cnt[SYNC_MARKS];
3915 int last_mark,m;
3916 struct list_head *tmp;
3917 sector_t last_check;
57afd89f 3918 int skipped = 0;
1da177e4
LT		 3919
3920 /* just incase thread restarts... */
3921 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
3922 return;
3923
3924 /* we overload curr_resync somewhat here.
3925 * 0 == not engaged in resync at all
3926 * 2 == checking that there is no conflict with another sync
3927 * 1 == like 2, but have yielded to allow conflicting resync to
3928 * commense
3929 * other == active in resync - this many blocks
3930 *
3931 * Before starting a resync we must have set curr_resync to
3932 * 2, and then checked that every "conflicting" array has curr_resync
3933 * less than ours. When we find one that is the same or higher
3934 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
3935 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
3936 * This will mean we have to start checking from the beginning again.
3937 *
3938 */
3939
3940 do {
3941 mddev->curr_resync = 2;
3942
3943 try_again:
787453c2 3944 if (kthread_should_stop()) {
6985c43f 3945 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 3946 goto skip;
3947 }
3948 ITERATE_MDDEV(mddev2,tmp) {
1da177e4
LT		 3949 if (mddev2 == mddev)
3950 continue;
3951 if (mddev2->curr_resync &&
3952 match_mddev_units(mddev,mddev2)) {
3953 DEFINE_WAIT(wq);
3954 if (mddev < mddev2 && mddev->curr_resync == 2) {
3955 /* arbitrarily yield */
3956 mddev->curr_resync = 1;
3957 wake_up(&resync_wait);
3958 }
3959 if (mddev > mddev2 && mddev->curr_resync == 1)
3960 /* no need to wait here, we can wait the next
3961 * time 'round when curr_resync == 2
3962 */
3963 continue;
787453c2
N		 3964 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
3965 if (!kthread_should_stop() &&
8712e553 3966 mddev2->curr_resync >= mddev->curr_resync) {
1da177e4
LT		 3967 printk(KERN_INFO "md: delaying resync of %s"
3968 " until %s has finished resync (they"
3969 " share one or more physical units)\n",
3970 mdname(mddev), mdname(mddev2));
3971 mddev_put(mddev2);
3972 schedule();
3973 finish_wait(&resync_wait, &wq);
3974 goto try_again;
3975 }
3976 finish_wait(&resync_wait, &wq);
3977 }
3978 }
3979 } while (mddev->curr_resync < 2);
3980
9d88883e 3981 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 3982 /* resync follows the size requested by the personality,
57afd89f 3983 * which defaults to physical size, but can be virtual size
1da177e4
LT		 3984 */
3985 max_sectors = mddev->resync_max_sectors;
9d88883e
N		 3986 mddev->resync_mismatches = 0;
3987 } else
1da177e4
LT		 3988 /* recovery follows the physical size of devices */
3989 max_sectors = mddev->size << 1;
3990
3991 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
3992 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
3993 " %d KB/sec/disc.\n", sysctl_speed_limit_min);
338cec32 3994 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
1da177e4
LT		 3995 "(but not more than %d KB/sec) for reconstruction.\n",
3996 sysctl_speed_limit_max);
3997
3998 is_mddev_idle(mddev); /* this also initializes IO event counters */
32a7627c 3999 /* we don't use the checkpoint if there's a bitmap */
24dd469d
N		 4000 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap
4001 && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
1da177e4
LT		 4002 j = mddev->recovery_cp;
4003 else
4004 j = 0;
57afd89f 4005 io_sectors = 0;
1da177e4
LT		 4006 for (m = 0; m < SYNC_MARKS; m++) {
4007 mark[m] = jiffies;
57afd89f 4008 mark_cnt[m] = io_sectors;
1da177e4
LT		 4009 }
4010 last_mark = 0;
4011 mddev->resync_mark = mark[last_mark];
4012 mddev->resync_mark_cnt = mark_cnt[last_mark];
4013
4014 /*
4015 * Tune reconstruction:
4016 */
4017 window = 32*(PAGE_SIZE/512);
4018 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
4019 window/2,(unsigned long long) max_sectors/2);
4020
4021 atomic_set(&mddev->recovery_active, 0);
4022 init_waitqueue_head(&mddev->recovery_wait);
4023 last_check = 0;
4024
4025 if (j>2) {
4026 printk(KERN_INFO
4027 "md: resuming recovery of %s from checkpoint.\n",
4028 mdname(mddev));
4029 mddev->curr_resync = j;
4030 }
4031
4032 while (j < max_sectors) {
57afd89f 4033 sector_t sectors;
1da177e4 4034
57afd89f
N		 4035 skipped = 0;
4036 sectors = mddev->pers->sync_request(mddev, j, &skipped,
4037 currspeed < sysctl_speed_limit_min);
4038 if (sectors == 0) {
1da177e4
LT		 4039 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4040 goto out;
4041 }
57afd89f
N		 4042
4043 if (!skipped) { /* actual IO requested */
4044 io_sectors += sectors;
4045 atomic_add(sectors, &mddev->recovery_active);
4046 }
4047
1da177e4
LT		 4048 j += sectors;
4049 if (j>1) mddev->curr_resync = j;
4050
57afd89f
N		 4051
4052 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 4053 continue;
4054
57afd89f 4055 last_check = io_sectors;
1da177e4
LT		 4056
4057 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
4058 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
4059 break;
4060
4061 repeat:
4062 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
4063 /* step marks */
4064 int next = (last_mark+1) % SYNC_MARKS;
4065
4066 mddev->resync_mark = mark[next];
4067 mddev->resync_mark_cnt = mark_cnt[next];
4068 mark[next] = jiffies;
57afd89f 4069 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 4070 last_mark = next;
4071 }
4072
4073
787453c2 4074 if (kthread_should_stop()) {
1da177e4
LT		 4075 /*
4076 * got a signal, exit.
4077 */
4078 printk(KERN_INFO
4079 "md: md_do_sync() got signal ... exiting\n");
1da177e4
LT		 4080 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4081 goto out;
4082 }
4083
4084 /*
4085 * this loop exits only if either when we are slower than
4086 * the 'hard' speed limit, or the system was IO-idle for
4087 * a jiffy.
4088 * the system might be non-idle CPU-wise, but we only care
4089 * about not overloading the IO subsystem. (things like an
4090 * e2fsck being done on the RAID array should execute fast)
4091 */
4092 mddev->queue->unplug_fn(mddev->queue);
4093 cond_resched();
4094
57afd89f
N		 4095 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
4096 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4
LT		 4097
4098 if (currspeed > sysctl_speed_limit_min) {
4099 if ((currspeed > sysctl_speed_limit_max) ||
4100 !is_mddev_idle(mddev)) {
787453c2 4101 msleep(250);
1da177e4
LT		 4102 goto repeat;
4103 }
4104 }
4105 }
4106 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
4107 /*
4108 * this also signals 'finished resyncing' to md_stop
4109 */
4110 out:
4111 mddev->queue->unplug_fn(mddev->queue);
4112
4113 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
4114
4115 /* tell personality that we are finished */
57afd89f 4116 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 4117
4118 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4119 mddev->curr_resync > 2 &&
4120 mddev->curr_resync >= mddev->recovery_cp) {
4121 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4122 printk(KERN_INFO
4123 "md: checkpointing recovery of %s.\n",
4124 mdname(mddev));
4125 mddev->recovery_cp = mddev->curr_resync;
4126 } else
4127 mddev->recovery_cp = MaxSector;
4128 }
4129
1da177e4
LT		 4130 skip:
4131 mddev->curr_resync = 0;
4132 wake_up(&resync_wait);
4133 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
4134 md_wakeup_thread(mddev->thread);
4135}
4136
4137
4138/*
4139 * This routine is regularly called by all per-raid-array threads to
4140 * deal with generic issues like resync and super-block update.
4141 * Raid personalities that don't have a thread (linear/raid0) do not
4142 * need this as they never do any recovery or update the superblock.
4143 *
4144 * It does not do any resync itself, but rather "forks" off other threads
4145 * to do that as needed.
4146 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4147 * "->recovery" and create a thread at ->sync_thread.
4148 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4149 * and wakeups up this thread which will reap the thread and finish up.
4150 * This thread also removes any faulty devices (with nr_pending == 0).
4151 *
4152 * The overall approach is:
4153 * 1/ if the superblock needs updating, update it.
4154 * 2/ If a recovery thread is running, don't do anything else.
4155 * 3/ If recovery has finished, clean up, possibly marking spares active.
4156 * 4/ If there are any faulty devices, remove them.
4157 * 5/ If array is degraded, try to add spares devices
4158 * 6/ If array has spares or is not in-sync, start a resync thread.
4159 */
4160void md_check_recovery(mddev_t *mddev)
4161{
4162 mdk_rdev_t *rdev;
4163 struct list_head *rtmp;
4164
4165
5f40402d
N		 4166 if (mddev->bitmap)
4167 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 4168
4169 if (mddev->ro)
4170 return;
fca4d848
N		 4171
4172 if (signal_pending(current)) {
4173 if (mddev->pers->sync_request) {
4174 printk(KERN_INFO "md: %s in immediate safe mode\n",
4175 mdname(mddev));
4176 mddev->safemode = 2;
4177 }
4178 flush_signals(current);
4179 }
4180
1da177e4
LT		 4181 if ( ! (
4182 mddev->sb_dirty ||
4183 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848
N		 4184 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
4185 (mddev->safemode == 1) ||
4186 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
4187 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 4188 ))
4189 return;
fca4d848 4190
1da177e4
LT		 4191 if (mddev_trylock(mddev)==0) {
4192 int spares =0;
fca4d848 4193
a9701a30 4194 spin_lock_irq(&mddev->write_lock);
fca4d848
N		 4195 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
4196 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
4197 mddev->in_sync = 1;
4198 mddev->sb_dirty = 1;
4199 }
4200 if (mddev->safemode == 1)
4201 mddev->safemode = 0;
a9701a30 4202 spin_unlock_irq(&mddev->write_lock);
fca4d848 4203
1da177e4
LT		 4204 if (mddev->sb_dirty)
4205 md_update_sb(mddev);
06d91a5f 4206
06d91a5f 4207
1da177e4
LT		 4208 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4209 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
4210 /* resync/recovery still happening */
4211 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4212 goto unlock;
4213 }
4214 if (mddev->sync_thread) {
4215 /* resync has finished, collect result */
4216 md_unregister_thread(mddev->sync_thread);
4217 mddev->sync_thread = NULL;
4218 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4219 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4220 /* success...*/
4221 /* activate any spares */
4222 mddev->pers->spare_active(mddev);
4223 }
4224 md_update_sb(mddev);
41158c7e
N		 4225
4226 /* if array is no-longer degraded, then any saved_raid_disk
4227 * information must be scrapped
4228 */
4229 if (!mddev->degraded)
4230 ITERATE_RDEV(mddev,rdev,rtmp)
4231 rdev->saved_raid_disk = -1;
4232
1da177e4
LT		 4233 mddev->recovery = 0;
4234 /* flag recovery needed just to double check */
4235 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4236 goto unlock;
4237 }
24dd469d
N		 4238 /* Clear some bits that don't mean anything, but
4239 * might be left set
4240 */
4241 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4242 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
4243 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
4244 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4
LT		 4245
4246 /* no recovery is running.
4247 * remove any failed drives, then
4248 * add spares if possible.
4249 * Spare are also removed and re-added, to allow
4250 * the personality to fail the re-add.
4251 */
4252 ITERATE_RDEV(mddev,rdev,rtmp)
4253 if (rdev->raid_disk >= 0 &&
b2d444d7 4254 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
1da177e4 4255 atomic_read(&rdev->nr_pending)==0) {
86e6ffdd
N		 4256 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
4257 char nm[20];
4258 sprintf(nm,"rd%d", rdev->raid_disk);
4259 sysfs_remove_link(&mddev->kobj, nm);
1da177e4 4260 rdev->raid_disk = -1;
86e6ffdd 4261 }
1da177e4
LT		 4262 }
4263
4264 if (mddev->degraded) {
4265 ITERATE_RDEV(mddev,rdev,rtmp)
4266 if (rdev->raid_disk < 0
b2d444d7 4267 && !test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 4268 if (mddev->pers->hot_add_disk(mddev,rdev)) {
4269 char nm[20];
4270 sprintf(nm, "rd%d", rdev->raid_disk);
4271 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
1da177e4 4272 spares++;
86e6ffdd 4273 } else
1da177e4
LT		 4274 break;
4275 }
4276 }
4277
24dd469d
N		 4278 if (spares) {
4279 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4280 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4281 } else if (mddev->recovery_cp < MaxSector) {
4282 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4283 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4284 /* nothing to be done ... */
1da177e4 4285 goto unlock;
24dd469d 4286
1da177e4
LT		 4287 if (mddev->pers->sync_request) {
4288 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 4289 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
4290 /* We are adding a device or devices to an array
4291 * which has the bitmap stored on all devices.
4292 * So make sure all bitmap pages get written
4293 */
4294 bitmap_write_all(mddev->bitmap);
4295 }
1da177e4
LT		 4296 mddev->sync_thread = md_register_thread(md_do_sync,
4297 mddev,
4298 "%s_resync");
4299 if (!mddev->sync_thread) {
4300 printk(KERN_ERR "%s: could not start resync"
4301 " thread...\n",
4302 mdname(mddev));
4303 /* leave the spares where they are, it shouldn't hurt */
4304 mddev->recovery = 0;
4305 } else {
4306 md_wakeup_thread(mddev->sync_thread);
4307 }
4308 }
4309 unlock:
4310 mddev_unlock(mddev);
4311 }
4312}
4313
75c96f85
AB		 4314static int md_notify_reboot(struct notifier_block *this,
4315 unsigned long code, void *x)
1da177e4
LT		 4316{
4317 struct list_head *tmp;
4318 mddev_t *mddev;
4319
4320 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
4321
4322 printk(KERN_INFO "md: stopping all md devices.\n");
4323
4324 ITERATE_MDDEV(mddev,tmp)
4325 if (mddev_trylock(mddev)==0)
4326 do_md_stop (mddev, 1);
4327 /*
4328 * certain more exotic SCSI devices are known to be
4329 * volatile wrt too early system reboots. While the
4330 * right place to handle this issue is the given
4331 * driver, we do want to have a safe RAID driver ...
4332 */
4333 mdelay(1000*1);
4334 }
4335 return NOTIFY_DONE;
4336}
4337
75c96f85 4338static struct notifier_block md_notifier = {
1da177e4
LT		 4339 .notifier_call = md_notify_reboot,
4340 .next = NULL,
4341 .priority = INT_MAX, /* before any real devices */
4342};
4343
4344static void md_geninit(void)
4345{
4346 struct proc_dir_entry *p;
4347
4348 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
4349
4350 p = create_proc_entry("mdstat", S_IRUGO, NULL);
4351 if (p)
4352 p->proc_fops = &md_seq_fops;
4353}
4354
75c96f85 4355static int __init md_init(void)
1da177e4
LT		 4356{
4357 int minor;
4358
4359 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4360 " MD_SB_DISKS=%d\n",
4361 MD_MAJOR_VERSION, MD_MINOR_VERSION,
4362 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
bd926c63 4363 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
32a7627c 4364 BITMAP_MINOR);
1da177e4
LT		 4365
4366 if (register_blkdev(MAJOR_NR, "md"))
4367 return -1;
4368 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
4369 unregister_blkdev(MAJOR_NR, "md");
4370 return -1;
4371 }
4372 devfs_mk_dir("md");
4373 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
4374 md_probe, NULL, NULL);
4375 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
4376 md_probe, NULL, NULL);
4377
4378 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4379 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
4380 S_IFBLK|S_IRUSR|S_IWUSR,
4381 "md/%d", minor);
4382
4383 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4384 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
4385 S_IFBLK|S_IRUSR|S_IWUSR,
4386 "md/mdp%d", minor);
4387
4388
4389 register_reboot_notifier(&md_notifier);
4390 raid_table_header = register_sysctl_table(raid_root_table, 1);
4391
4392 md_geninit();
4393 return (0);
4394}
4395
4396
4397#ifndef MODULE
4398
4399/*
4400 * Searches all registered partitions for autorun RAID arrays
4401 * at boot time.
4402 */
4403static dev_t detected_devices[128];
4404static int dev_cnt;
4405
4406void md_autodetect_dev(dev_t dev)
4407{
4408 if (dev_cnt >= 0 && dev_cnt < 127)
4409 detected_devices[dev_cnt++] = dev;
4410}
4411
4412
4413static void autostart_arrays(int part)
4414{
4415 mdk_rdev_t *rdev;
4416 int i;
4417
4418 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
4419
4420 for (i = 0; i < dev_cnt; i++) {
4421 dev_t dev = detected_devices[i];
4422
4423 rdev = md_import_device(dev,0, 0);
4424 if (IS_ERR(rdev))
4425 continue;
4426
b2d444d7 4427 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4428 MD_BUG();
4429 continue;
4430 }
4431 list_add(&rdev->same_set, &pending_raid_disks);
4432 }
4433 dev_cnt = 0;
4434
4435 autorun_devices(part);
4436}
4437
4438#endif
4439
4440static __exit void md_exit(void)
4441{
4442 mddev_t *mddev;
4443 struct list_head *tmp;
4444 int i;
4445 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
4446 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
4447 for (i=0; i < MAX_MD_DEVS; i++)
4448 devfs_remove("md/%d", i);
4449 for (i=0; i < MAX_MD_DEVS; i++)
4450 devfs_remove("md/d%d", i);
4451
4452 devfs_remove("md");
4453
4454 unregister_blkdev(MAJOR_NR,"md");
4455 unregister_blkdev(mdp_major, "mdp");
4456 unregister_reboot_notifier(&md_notifier);
4457 unregister_sysctl_table(raid_table_header);
4458 remove_proc_entry("mdstat", NULL);
4459 ITERATE_MDDEV(mddev,tmp) {
4460 struct gendisk *disk = mddev->gendisk;
4461 if (!disk)
4462 continue;
4463 export_array(mddev);
4464 del_gendisk(disk);
4465 put_disk(disk);
4466 mddev->gendisk = NULL;
4467 mddev_put(mddev);
4468 }
4469}
4470
4471module_init(md_init)
4472module_exit(md_exit)
4473
f91de92e
N		 4474static int get_ro(char *buffer, struct kernel_param *kp)
4475{
4476 return sprintf(buffer, "%d", start_readonly);
4477}
4478static int set_ro(const char *val, struct kernel_param *kp)
4479{
4480 char *e;
4481 int num = simple_strtoul(val, &e, 10);
4482 if (*val && (*e == '\0' || *e == '\n')) {
4483 start_readonly = num;
4484 return 0;;
4485 }
4486 return -EINVAL;
4487}
4488
4489module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
4490
1da177e4
LT		 4491EXPORT_SYMBOL(register_md_personality);
4492EXPORT_SYMBOL(unregister_md_personality);
4493EXPORT_SYMBOL(md_error);
4494EXPORT_SYMBOL(md_done_sync);
4495EXPORT_SYMBOL(md_write_start);
4496EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 4497EXPORT_SYMBOL(md_register_thread);
4498EXPORT_SYMBOL(md_unregister_thread);
4499EXPORT_SYMBOL(md_wakeup_thread);
4500EXPORT_SYMBOL(md_print_devices);
4501EXPORT_SYMBOL(md_check_recovery);
4502MODULE_LICENSE("GPL");
aa1595e9 4503MODULE_ALIAS("md");
72008652 4504MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
Clone of davem's net-next-2.6 tree