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[PATCH] md: ignore auto-readonly flag for arrays where it isn't meaningful
[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
N		 1748static ssize_t
1749md_show_scan(mddev_t *mddev, char *page)
1750{
1751 char *type = "none";
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
1768md_store_scan(mddev_t *mddev, const char *page, size_t len)
1769{
1770 int canscan=0;
31399d9e
N		 1771
1772 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
1773 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 1774 return -EBUSY;
96de1e66 1775
24dd469d
N		 1776 if (mddev->pers && mddev->pers->sync_request)
1777 canscan=1;
96de1e66 1778
24dd469d
N		 1779 if (!canscan)
1780 return -EINVAL;
1781
1782 if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0)
1783 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
1784 else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0)
1785 return -EINVAL;
1786 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
1787 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
1788 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
1789 md_wakeup_thread(mddev->thread);
1790 return len;
1791}
1792
9d88883e 1793static ssize_t
96de1e66 1794mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 1795{
1796 return sprintf(page, "%llu\n",
1797 (unsigned long long) mddev->resync_mismatches);
1798}
1799
96de1e66
N		 1800static struct md_sysfs_entry
1801md_scan_mode = __ATTR(scan_mode, S_IRUGO|S_IWUSR, md_show_scan, md_store_scan);
24dd469d 1802
96de1e66
N		 1803
1804static struct md_sysfs_entry
1805md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 1806
eae1701f
N		 1807static struct attribute *md_default_attrs[] = {
1808 &md_level.attr,
1809 &md_raid_disks.attr,
411036fa
N		 1810 NULL,
1811};
1812
1813static struct attribute *md_redundancy_attrs[] = {
24dd469d 1814 &md_scan_mode.attr,
9d88883e 1815 &md_mismatches.attr,
eae1701f
N		 1816 NULL,
1817};
411036fa
N		 1818static struct attribute_group md_redundancy_group = {
1819 .name = NULL,
1820 .attrs = md_redundancy_attrs,
1821};
1822
eae1701f
N		 1823
1824static ssize_t
1825md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1826{
1827 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
1828 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 1829 ssize_t rv;
eae1701f
N		 1830
1831 if (!entry->show)
1832 return -EIO;
96de1e66
N		 1833 mddev_lock(mddev);
1834 rv = entry->show(mddev, page);
1835 mddev_unlock(mddev);
1836 return rv;
eae1701f
N		 1837}
1838
1839static ssize_t
1840md_attr_store(struct kobject *kobj, struct attribute *attr,
1841 const char *page, size_t length)
1842{
1843 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
1844 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 1845 ssize_t rv;
eae1701f
N		 1846
1847 if (!entry->store)
1848 return -EIO;
96de1e66
N		 1849 mddev_lock(mddev);
1850 rv = entry->store(mddev, page, length);
1851 mddev_unlock(mddev);
1852 return rv;
eae1701f
N		 1853}
1854
1855static void md_free(struct kobject *ko)
1856{
1857 mddev_t *mddev = container_of(ko, mddev_t, kobj);
1858 kfree(mddev);
1859}
1860
1861static struct sysfs_ops md_sysfs_ops = {
1862 .show = md_attr_show,
1863 .store = md_attr_store,
1864};
1865static struct kobj_type md_ktype = {
1866 .release = md_free,
1867 .sysfs_ops = &md_sysfs_ops,
1868 .default_attrs = md_default_attrs,
1869};
1870
1da177e4
LT		 1871int mdp_major = 0;
1872
1873static struct kobject *md_probe(dev_t dev, int *part, void *data)
1874{
1875 static DECLARE_MUTEX(disks_sem);
1876 mddev_t *mddev = mddev_find(dev);
1877 struct gendisk *disk;
1878 int partitioned = (MAJOR(dev) != MD_MAJOR);
1879 int shift = partitioned ? MdpMinorShift : 0;
1880 int unit = MINOR(dev) >> shift;
1881
1882 if (!mddev)
1883 return NULL;
1884
1885 down(&disks_sem);
1886 if (mddev->gendisk) {
1887 up(&disks_sem);
1888 mddev_put(mddev);
1889 return NULL;
1890 }
1891 disk = alloc_disk(1 << shift);
1892 if (!disk) {
1893 up(&disks_sem);
1894 mddev_put(mddev);
1895 return NULL;
1896 }
1897 disk->major = MAJOR(dev);
1898 disk->first_minor = unit << shift;
1899 if (partitioned) {
1900 sprintf(disk->disk_name, "md_d%d", unit);
1901 sprintf(disk->devfs_name, "md/d%d", unit);
1902 } else {
1903 sprintf(disk->disk_name, "md%d", unit);
1904 sprintf(disk->devfs_name, "md/%d", unit);
1905 }
1906 disk->fops = &md_fops;
1907 disk->private_data = mddev;
1908 disk->queue = mddev->queue;
1909 add_disk(disk);
1910 mddev->gendisk = disk;
1911 up(&disks_sem);
9c791977 1912 mddev->kobj.parent = &disk->kobj;
eae1701f
N		 1913 mddev->kobj.k_name = NULL;
1914 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
1915 mddev->kobj.ktype = &md_ktype;
1916 kobject_register(&mddev->kobj);
1da177e4
LT		 1917 return NULL;
1918}
1919
1920void md_wakeup_thread(mdk_thread_t *thread);
1921
1922static void md_safemode_timeout(unsigned long data)
1923{
1924 mddev_t *mddev = (mddev_t *) data;
1925
1926 mddev->safemode = 1;
1927 md_wakeup_thread(mddev->thread);
1928}
1929
1930
1931static int do_md_run(mddev_t * mddev)
1932{
1933 int pnum, err;
1934 int chunk_size;
1935 struct list_head *tmp;
1936 mdk_rdev_t *rdev;
1937 struct gendisk *disk;
1938 char b[BDEVNAME_SIZE];
1939
a757e64c
N		 1940 if (list_empty(&mddev->disks))
1941 /* cannot run an array with no devices.. */
1da177e4 1942 return -EINVAL;
1da177e4
LT		 1943
1944 if (mddev->pers)
1945 return -EBUSY;
1946
1947 /*
1948 * Analyze all RAID superblock(s)
1949 */
a757e64c
N		 1950 if (!mddev->raid_disks)
1951 analyze_sbs(mddev);
1da177e4
LT		 1952
1953 chunk_size = mddev->chunk_size;
1954 pnum = level_to_pers(mddev->level);
1955
1956 if ((pnum != MULTIPATH) && (pnum != RAID1)) {
1957 if (!chunk_size) {
1958 /*
1959 * 'default chunksize' in the old md code used to
1960 * be PAGE_SIZE, baaad.
1961 * we abort here to be on the safe side. We don't
1962 * want to continue the bad practice.
1963 */
1964 printk(KERN_ERR
1965 "no chunksize specified, see 'man raidtab'\n");
1966 return -EINVAL;
1967 }
1968 if (chunk_size > MAX_CHUNK_SIZE) {
1969 printk(KERN_ERR "too big chunk_size: %d > %d\n",
1970 chunk_size, MAX_CHUNK_SIZE);
1971 return -EINVAL;
1972 }
1973 /*
1974 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
1975 */
1976 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 1977 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 1978 return -EINVAL;
1979 }
1980 if (chunk_size < PAGE_SIZE) {
1981 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
1982 chunk_size, PAGE_SIZE);
1983 return -EINVAL;
1984 }
1985
1986 /* devices must have minimum size of one chunk */
1987 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 1988 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1989 continue;
1990 if (rdev->size < chunk_size / 1024) {
1991 printk(KERN_WARNING
1992 "md: Dev %s smaller than chunk_size:"
1993 " %lluk < %dk\n",
1994 bdevname(rdev->bdev,b),
1995 (unsigned long long)rdev->size,
1996 chunk_size / 1024);
1997 return -EINVAL;
1998 }
1999 }
2000 }
2001
1da177e4
LT		 2002#ifdef CONFIG_KMOD
2003 if (!pers[pnum])
2004 {
2005 request_module("md-personality-%d", pnum);
2006 }
2007#endif
2008
2009 /*
2010 * Drop all container device buffers, from now on
2011 * the only valid external interface is through the md
2012 * device.
2013 * Also find largest hardsector size
2014 */
2015 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2016 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2017 continue;
2018 sync_blockdev(rdev->bdev);
2019 invalidate_bdev(rdev->bdev, 0);
2020 }
2021
2022 md_probe(mddev->unit, NULL, NULL);
2023 disk = mddev->gendisk;
2024 if (!disk)
2025 return -ENOMEM;
2026
2027 spin_lock(&pers_lock);
2028 if (!pers[pnum] || !try_module_get(pers[pnum]->owner)) {
2029 spin_unlock(&pers_lock);
2030 printk(KERN_WARNING "md: personality %d is not loaded!\n",
2031 pnum);
2032 return -EINVAL;
2033 }
2034
2035 mddev->pers = pers[pnum];
2036 spin_unlock(&pers_lock);
2037
657390d2 2038 mddev->recovery = 0;
1da177e4 2039 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 2040 mddev->barriers_work = 1;
1da177e4 2041
f91de92e
N		 2042 if (start_readonly)
2043 mddev->ro = 2; /* read-only, but switch on first write */
2044
32a7627c
N		 2045 /* before we start the array running, initialise the bitmap */
2046 err = bitmap_create(mddev);
2047 if (err)
2048 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
2049 mdname(mddev), err);
2050 else
2051 err = mddev->pers->run(mddev);
1da177e4
LT		 2052 if (err) {
2053 printk(KERN_ERR "md: pers->run() failed ...\n");
2054 module_put(mddev->pers->owner);
2055 mddev->pers = NULL;
32a7627c
N		 2056 bitmap_destroy(mddev);
2057 return err;
1da177e4 2058 }
411036fa
N		 2059 if (mddev->pers->sync_request)
2060 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
fd9d49ca
N		 2061 else if (mddev->ro == 2) /* auto-readonly not meaningful */
2062 mddev->ro = 0;
2063
1da177e4
LT		 2064 atomic_set(&mddev->writes_pending,0);
2065 mddev->safemode = 0;
2066 mddev->safemode_timer.function = md_safemode_timeout;
2067 mddev->safemode_timer.data = (unsigned long) mddev;
2068 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */
2069 mddev->in_sync = 1;
86e6ffdd
N		 2070
2071 ITERATE_RDEV(mddev,rdev,tmp)
2072 if (rdev->raid_disk >= 0) {
2073 char nm[20];
2074 sprintf(nm, "rd%d", rdev->raid_disk);
2075 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2076 }
1da177e4
LT		 2077
2078 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 2079 md_wakeup_thread(mddev->thread);
1da177e4
LT		 2080
2081 if (mddev->sb_dirty)
2082 md_update_sb(mddev);
2083
2084 set_capacity(disk, mddev->array_size<<1);
2085
2086 /* If we call blk_queue_make_request here, it will
2087 * re-initialise max_sectors etc which may have been
2088 * refined inside -> run. So just set the bits we need to set.
2089 * Most initialisation happended when we called
2090 * blk_queue_make_request(..., md_fail_request)
2091 * earlier.
2092 */
2093 mddev->queue->queuedata = mddev;
2094 mddev->queue->make_request_fn = mddev->pers->make_request;
2095
2096 mddev->changed = 1;
2097 return 0;
2098}
2099
2100static int restart_array(mddev_t *mddev)
2101{
2102 struct gendisk *disk = mddev->gendisk;
2103 int err;
2104
2105 /*
2106 * Complain if it has no devices
2107 */
2108 err = -ENXIO;
2109 if (list_empty(&mddev->disks))
2110 goto out;
2111
2112 if (mddev->pers) {
2113 err = -EBUSY;
2114 if (!mddev->ro)
2115 goto out;
2116
2117 mddev->safemode = 0;
2118 mddev->ro = 0;
2119 set_disk_ro(disk, 0);
2120
2121 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2122 mdname(mddev));
2123 /*
2124 * Kick recovery or resync if necessary
2125 */
2126 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2127 md_wakeup_thread(mddev->thread);
2128 err = 0;
2129 } else {
2130 printk(KERN_ERR "md: %s has no personality assigned.\n",
2131 mdname(mddev));
2132 err = -EINVAL;
2133 }
2134
2135out:
2136 return err;
2137}
2138
2139static int do_md_stop(mddev_t * mddev, int ro)
2140{
2141 int err = 0;
2142 struct gendisk *disk = mddev->gendisk;
2143
2144 if (mddev->pers) {
2145 if (atomic_read(&mddev->active)>2) {
2146 printk("md: %s still in use.\n",mdname(mddev));
2147 return -EBUSY;
2148 }
2149
2150 if (mddev->sync_thread) {
2151 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2152 md_unregister_thread(mddev->sync_thread);
2153 mddev->sync_thread = NULL;
2154 }
2155
2156 del_timer_sync(&mddev->safemode_timer);
2157
2158 invalidate_partition(disk, 0);
2159
2160 if (ro) {
2161 err = -ENXIO;
f91de92e 2162 if (mddev->ro==1)
1da177e4
LT		 2163 goto out;
2164 mddev->ro = 1;
2165 } else {
6b8b3e8a 2166 bitmap_flush(mddev);
a9701a30 2167 md_super_wait(mddev);
1da177e4
LT		 2168 if (mddev->ro)
2169 set_disk_ro(disk, 0);
2170 blk_queue_make_request(mddev->queue, md_fail_request);
2171 mddev->pers->stop(mddev);
411036fa
N		 2172 if (mddev->pers->sync_request)
2173 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
2174
1da177e4
LT		 2175 module_put(mddev->pers->owner);
2176 mddev->pers = NULL;
2177 if (mddev->ro)
2178 mddev->ro = 0;
2179 }
2180 if (!mddev->in_sync) {
2181 /* mark array as shutdown cleanly */
2182 mddev->in_sync = 1;
2183 md_update_sb(mddev);
2184 }
2185 if (ro)
2186 set_disk_ro(disk, 1);
2187 }
32a7627c
N		 2188
2189 bitmap_destroy(mddev);
2190 if (mddev->bitmap_file) {
2191 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
2192 fput(mddev->bitmap_file);
2193 mddev->bitmap_file = NULL;
2194 }
9223214e 2195 mddev->bitmap_offset = 0;
32a7627c 2196
1da177e4
LT		 2197 /*
2198 * Free resources if final stop
2199 */
2200 if (!ro) {
86e6ffdd
N		 2201 mdk_rdev_t *rdev;
2202 struct list_head *tmp;
1da177e4
LT		 2203 struct gendisk *disk;
2204 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
2205
86e6ffdd
N		 2206 ITERATE_RDEV(mddev,rdev,tmp)
2207 if (rdev->raid_disk >= 0) {
2208 char nm[20];
2209 sprintf(nm, "rd%d", rdev->raid_disk);
2210 sysfs_remove_link(&mddev->kobj, nm);
2211 }
2212
1da177e4
LT		 2213 export_array(mddev);
2214
2215 mddev->array_size = 0;
2216 disk = mddev->gendisk;
2217 if (disk)
2218 set_capacity(disk, 0);
2219 mddev->changed = 1;
2220 } else
2221 printk(KERN_INFO "md: %s switched to read-only mode.\n",
2222 mdname(mddev));
2223 err = 0;
2224out:
2225 return err;
2226}
2227
2228static void autorun_array(mddev_t *mddev)
2229{
2230 mdk_rdev_t *rdev;
2231 struct list_head *tmp;
2232 int err;
2233
a757e64c 2234 if (list_empty(&mddev->disks))
1da177e4 2235 return;
1da177e4
LT		 2236
2237 printk(KERN_INFO "md: running: ");
2238
2239 ITERATE_RDEV(mddev,rdev,tmp) {
2240 char b[BDEVNAME_SIZE];
2241 printk("<%s>", bdevname(rdev->bdev,b));
2242 }
2243 printk("\n");
2244
2245 err = do_md_run (mddev);
2246 if (err) {
2247 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
2248 do_md_stop (mddev, 0);
2249 }
2250}
2251
2252/*
2253 * lets try to run arrays based on all disks that have arrived
2254 * until now. (those are in pending_raid_disks)
2255 *
2256 * the method: pick the first pending disk, collect all disks with
2257 * the same UUID, remove all from the pending list and put them into
2258 * the 'same_array' list. Then order this list based on superblock
2259 * update time (freshest comes first), kick out 'old' disks and
2260 * compare superblocks. If everything's fine then run it.
2261 *
2262 * If "unit" is allocated, then bump its reference count
2263 */
2264static void autorun_devices(int part)
2265{
2266 struct list_head candidates;
2267 struct list_head *tmp;
2268 mdk_rdev_t *rdev0, *rdev;
2269 mddev_t *mddev;
2270 char b[BDEVNAME_SIZE];
2271
2272 printk(KERN_INFO "md: autorun ...\n");
2273 while (!list_empty(&pending_raid_disks)) {
2274 dev_t dev;
2275 rdev0 = list_entry(pending_raid_disks.next,
2276 mdk_rdev_t, same_set);
2277
2278 printk(KERN_INFO "md: considering %s ...\n",
2279 bdevname(rdev0->bdev,b));
2280 INIT_LIST_HEAD(&candidates);
2281 ITERATE_RDEV_PENDING(rdev,tmp)
2282 if (super_90_load(rdev, rdev0, 0) >= 0) {
2283 printk(KERN_INFO "md: adding %s ...\n",
2284 bdevname(rdev->bdev,b));
2285 list_move(&rdev->same_set, &candidates);
2286 }
2287 /*
2288 * now we have a set of devices, with all of them having
2289 * mostly sane superblocks. It's time to allocate the
2290 * mddev.
2291 */
2292 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
2293 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
2294 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
2295 break;
2296 }
2297 if (part)
2298 dev = MKDEV(mdp_major,
2299 rdev0->preferred_minor << MdpMinorShift);
2300 else
2301 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
2302
2303 md_probe(dev, NULL, NULL);
2304 mddev = mddev_find(dev);
2305 if (!mddev) {
2306 printk(KERN_ERR
2307 "md: cannot allocate memory for md drive.\n");
2308 break;
2309 }
2310 if (mddev_lock(mddev))
2311 printk(KERN_WARNING "md: %s locked, cannot run\n",
2312 mdname(mddev));
2313 else if (mddev->raid_disks || mddev->major_version
2314 || !list_empty(&mddev->disks)) {
2315 printk(KERN_WARNING
2316 "md: %s already running, cannot run %s\n",
2317 mdname(mddev), bdevname(rdev0->bdev,b));
2318 mddev_unlock(mddev);
2319 } else {
2320 printk(KERN_INFO "md: created %s\n", mdname(mddev));
2321 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
2322 list_del_init(&rdev->same_set);
2323 if (bind_rdev_to_array(rdev, mddev))
2324 export_rdev(rdev);
2325 }
2326 autorun_array(mddev);
2327 mddev_unlock(mddev);
2328 }
2329 /* on success, candidates will be empty, on error
2330 * it won't...
2331 */
2332 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
2333 export_rdev(rdev);
2334 mddev_put(mddev);
2335 }
2336 printk(KERN_INFO "md: ... autorun DONE.\n");
2337}
2338
2339/*
2340 * import RAID devices based on one partition
2341 * if possible, the array gets run as well.
2342 */
2343
2344static int autostart_array(dev_t startdev)
2345{
2346 char b[BDEVNAME_SIZE];
2347 int err = -EINVAL, i;
2348 mdp_super_t *sb = NULL;
2349 mdk_rdev_t *start_rdev = NULL, *rdev;
2350
2351 start_rdev = md_import_device(startdev, 0, 0);
2352 if (IS_ERR(start_rdev))
2353 return err;
2354
2355
2356 /* NOTE: this can only work for 0.90.0 superblocks */
2357 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
2358 if (sb->major_version != 0 ||
2359 sb->minor_version != 90 ) {
2360 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
2361 export_rdev(start_rdev);
2362 return err;
2363 }
2364
b2d444d7 2365 if (test_bit(Faulty, &start_rdev->flags)) {
1da177e4
LT		 2366 printk(KERN_WARNING
2367 "md: can not autostart based on faulty %s!\n",
2368 bdevname(start_rdev->bdev,b));
2369 export_rdev(start_rdev);
2370 return err;
2371 }
2372 list_add(&start_rdev->same_set, &pending_raid_disks);
2373
2374 for (i = 0; i < MD_SB_DISKS; i++) {
2375 mdp_disk_t *desc = sb->disks + i;
2376 dev_t dev = MKDEV(desc->major, desc->minor);
2377
2378 if (!dev)
2379 continue;
2380 if (dev == startdev)
2381 continue;
2382 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
2383 continue;
2384 rdev = md_import_device(dev, 0, 0);
2385 if (IS_ERR(rdev))
2386 continue;
2387
2388 list_add(&rdev->same_set, &pending_raid_disks);
2389 }
2390
2391 /*
2392 * possibly return codes
2393 */
2394 autorun_devices(0);
2395 return 0;
2396
2397}
2398
2399
2400static int get_version(void __user * arg)
2401{
2402 mdu_version_t ver;
2403
2404 ver.major = MD_MAJOR_VERSION;
2405 ver.minor = MD_MINOR_VERSION;
2406 ver.patchlevel = MD_PATCHLEVEL_VERSION;
2407
2408 if (copy_to_user(arg, &ver, sizeof(ver)))
2409 return -EFAULT;
2410
2411 return 0;
2412}
2413
2414static int get_array_info(mddev_t * mddev, void __user * arg)
2415{
2416 mdu_array_info_t info;
2417 int nr,working,active,failed,spare;
2418 mdk_rdev_t *rdev;
2419 struct list_head *tmp;
2420
2421 nr=working=active=failed=spare=0;
2422 ITERATE_RDEV(mddev,rdev,tmp) {
2423 nr++;
b2d444d7 2424 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2425 failed++;
2426 else {
2427 working++;
b2d444d7 2428 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 2429 active++;
2430 else
2431 spare++;
2432 }
2433 }
2434
2435 info.major_version = mddev->major_version;
2436 info.minor_version = mddev->minor_version;
2437 info.patch_version = MD_PATCHLEVEL_VERSION;
2438 info.ctime = mddev->ctime;
2439 info.level = mddev->level;
2440 info.size = mddev->size;
2441 info.nr_disks = nr;
2442 info.raid_disks = mddev->raid_disks;
2443 info.md_minor = mddev->md_minor;
2444 info.not_persistent= !mddev->persistent;
2445
2446 info.utime = mddev->utime;
2447 info.state = 0;
2448 if (mddev->in_sync)
2449 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 2450 if (mddev->bitmap && mddev->bitmap_offset)
2451 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 2452 info.active_disks = active;
2453 info.working_disks = working;
2454 info.failed_disks = failed;
2455 info.spare_disks = spare;
2456
2457 info.layout = mddev->layout;
2458 info.chunk_size = mddev->chunk_size;
2459
2460 if (copy_to_user(arg, &info, sizeof(info)))
2461 return -EFAULT;
2462
2463 return 0;
2464}
2465
87162a28 2466static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 2467{
2468 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
2469 char *ptr, *buf = NULL;
2470 int err = -ENOMEM;
2471
2472 file = kmalloc(sizeof(*file), GFP_KERNEL);
2473 if (!file)
2474 goto out;
2475
2476 /* bitmap disabled, zero the first byte and copy out */
2477 if (!mddev->bitmap || !mddev->bitmap->file) {
2478 file->pathname[0] = '\0';
2479 goto copy_out;
2480 }
2481
2482 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
2483 if (!buf)
2484 goto out;
2485
2486 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
2487 if (!ptr)
2488 goto out;
2489
2490 strcpy(file->pathname, ptr);
2491
2492copy_out:
2493 err = 0;
2494 if (copy_to_user(arg, file, sizeof(*file)))
2495 err = -EFAULT;
2496out:
2497 kfree(buf);
2498 kfree(file);
2499 return err;
2500}
2501
1da177e4
LT		 2502static int get_disk_info(mddev_t * mddev, void __user * arg)
2503{
2504 mdu_disk_info_t info;
2505 unsigned int nr;
2506 mdk_rdev_t *rdev;
2507
2508 if (copy_from_user(&info, arg, sizeof(info)))
2509 return -EFAULT;
2510
2511 nr = info.number;
2512
2513 rdev = find_rdev_nr(mddev, nr);
2514 if (rdev) {
2515 info.major = MAJOR(rdev->bdev->bd_dev);
2516 info.minor = MINOR(rdev->bdev->bd_dev);
2517 info.raid_disk = rdev->raid_disk;
2518 info.state = 0;
b2d444d7 2519 if (test_bit(Faulty, &rdev->flags))
1da177e4 2520 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 2521 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 2522 info.state |= (1<<MD_DISK_ACTIVE);
2523 info.state |= (1<<MD_DISK_SYNC);
2524 }
8ddf9efe
N		 2525 if (test_bit(WriteMostly, &rdev->flags))
2526 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 2527 } else {
2528 info.major = info.minor = 0;
2529 info.raid_disk = -1;
2530 info.state = (1<<MD_DISK_REMOVED);
2531 }
2532
2533 if (copy_to_user(arg, &info, sizeof(info)))
2534 return -EFAULT;
2535
2536 return 0;
2537}
2538
2539static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
2540{
2541 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
2542 mdk_rdev_t *rdev;
2543 dev_t dev = MKDEV(info->major,info->minor);
2544
2545 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
2546 return -EOVERFLOW;
2547
2548 if (!mddev->raid_disks) {
2549 int err;
2550 /* expecting a device which has a superblock */
2551 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
2552 if (IS_ERR(rdev)) {
2553 printk(KERN_WARNING
2554 "md: md_import_device returned %ld\n",
2555 PTR_ERR(rdev));
2556 return PTR_ERR(rdev);
2557 }
2558 if (!list_empty(&mddev->disks)) {
2559 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2560 mdk_rdev_t, same_set);
2561 int err = super_types[mddev->major_version]
2562 .load_super(rdev, rdev0, mddev->minor_version);
2563 if (err < 0) {
2564 printk(KERN_WARNING
2565 "md: %s has different UUID to %s\n",
2566 bdevname(rdev->bdev,b),
2567 bdevname(rdev0->bdev,b2));
2568 export_rdev(rdev);
2569 return -EINVAL;
2570 }
2571 }
2572 err = bind_rdev_to_array(rdev, mddev);
2573 if (err)
2574 export_rdev(rdev);
2575 return err;
2576 }
2577
2578 /*
2579 * add_new_disk can be used once the array is assembled
2580 * to add "hot spares". They must already have a superblock
2581 * written
2582 */
2583 if (mddev->pers) {
2584 int err;
2585 if (!mddev->pers->hot_add_disk) {
2586 printk(KERN_WARNING
2587 "%s: personality does not support diskops!\n",
2588 mdname(mddev));
2589 return -EINVAL;
2590 }
7b1e35f6
N		 2591 if (mddev->persistent)
2592 rdev = md_import_device(dev, mddev->major_version,
2593 mddev->minor_version);
2594 else
2595 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 2596 if (IS_ERR(rdev)) {
2597 printk(KERN_WARNING
2598 "md: md_import_device returned %ld\n",
2599 PTR_ERR(rdev));
2600 return PTR_ERR(rdev);
2601 }
41158c7e
N		 2602 /* set save_raid_disk if appropriate */
2603 if (!mddev->persistent) {
2604 if (info->state & (1<<MD_DISK_SYNC) &&
2605 info->raid_disk < mddev->raid_disks)
2606 rdev->raid_disk = info->raid_disk;
2607 else
2608 rdev->raid_disk = -1;
2609 } else
2610 super_types[mddev->major_version].
2611 validate_super(mddev, rdev);
2612 rdev->saved_raid_disk = rdev->raid_disk;
2613
b2d444d7 2614 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 2615 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
2616 set_bit(WriteMostly, &rdev->flags);
2617
1da177e4
LT		 2618 rdev->raid_disk = -1;
2619 err = bind_rdev_to_array(rdev, mddev);
2620 if (err)
2621 export_rdev(rdev);
c361777f
N		 2622
2623 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 2624 md_wakeup_thread(mddev->thread);
1da177e4
LT		 2625 return err;
2626 }
2627
2628 /* otherwise, add_new_disk is only allowed
2629 * for major_version==0 superblocks
2630 */
2631 if (mddev->major_version != 0) {
2632 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
2633 mdname(mddev));
2634 return -EINVAL;
2635 }
2636
2637 if (!(info->state & (1<<MD_DISK_FAULTY))) {
2638 int err;
2639 rdev = md_import_device (dev, -1, 0);
2640 if (IS_ERR(rdev)) {
2641 printk(KERN_WARNING
2642 "md: error, md_import_device() returned %ld\n",
2643 PTR_ERR(rdev));
2644 return PTR_ERR(rdev);
2645 }
2646 rdev->desc_nr = info->number;
2647 if (info->raid_disk < mddev->raid_disks)
2648 rdev->raid_disk = info->raid_disk;
2649 else
2650 rdev->raid_disk = -1;
2651
b2d444d7
N		 2652 rdev->flags = 0;
2653
1da177e4 2654 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 2655 if (info->state & (1<<MD_DISK_SYNC))
2656 set_bit(In_sync, &rdev->flags);
1da177e4 2657
8ddf9efe
N		 2658 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
2659 set_bit(WriteMostly, &rdev->flags);
2660
1da177e4
LT		 2661 err = bind_rdev_to_array(rdev, mddev);
2662 if (err) {
2663 export_rdev(rdev);
2664 return err;
2665 }
2666
2667 if (!mddev->persistent) {
2668 printk(KERN_INFO "md: nonpersistent superblock ...\n");
2669 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2670 } else
2671 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
2672 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
2673
2674 if (!mddev->size || (mddev->size > rdev->size))
2675 mddev->size = rdev->size;
2676 }
2677
2678 return 0;
2679}
2680
2681static int hot_remove_disk(mddev_t * mddev, dev_t dev)
2682{
2683 char b[BDEVNAME_SIZE];
2684 mdk_rdev_t *rdev;
2685
2686 if (!mddev->pers)
2687 return -ENODEV;
2688
2689 rdev = find_rdev(mddev, dev);
2690 if (!rdev)
2691 return -ENXIO;
2692
2693 if (rdev->raid_disk >= 0)
2694 goto busy;
2695
2696 kick_rdev_from_array(rdev);
2697 md_update_sb(mddev);
2698
2699 return 0;
2700busy:
2701 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
2702 bdevname(rdev->bdev,b), mdname(mddev));
2703 return -EBUSY;
2704}
2705
2706static int hot_add_disk(mddev_t * mddev, dev_t dev)
2707{
2708 char b[BDEVNAME_SIZE];
2709 int err;
2710 unsigned int size;
2711 mdk_rdev_t *rdev;
2712
2713 if (!mddev->pers)
2714 return -ENODEV;
2715
2716 if (mddev->major_version != 0) {
2717 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
2718 " version-0 superblocks.\n",
2719 mdname(mddev));
2720 return -EINVAL;
2721 }
2722 if (!mddev->pers->hot_add_disk) {
2723 printk(KERN_WARNING
2724 "%s: personality does not support diskops!\n",
2725 mdname(mddev));
2726 return -EINVAL;
2727 }
2728
2729 rdev = md_import_device (dev, -1, 0);
2730 if (IS_ERR(rdev)) {
2731 printk(KERN_WARNING
2732 "md: error, md_import_device() returned %ld\n",
2733 PTR_ERR(rdev));
2734 return -EINVAL;
2735 }
2736
2737 if (mddev->persistent)
2738 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
2739 else
2740 rdev->sb_offset =
2741 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2742
2743 size = calc_dev_size(rdev, mddev->chunk_size);
2744 rdev->size = size;
2745
2746 if (size < mddev->size) {
2747 printk(KERN_WARNING
2748 "%s: disk size %llu blocks < array size %llu\n",
2749 mdname(mddev), (unsigned long long)size,
2750 (unsigned long long)mddev->size);
2751 err = -ENOSPC;
2752 goto abort_export;
2753 }
2754
b2d444d7 2755 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 2756 printk(KERN_WARNING
2757 "md: can not hot-add faulty %s disk to %s!\n",
2758 bdevname(rdev->bdev,b), mdname(mddev));
2759 err = -EINVAL;
2760 goto abort_export;
2761 }
b2d444d7 2762 clear_bit(In_sync, &rdev->flags);
1da177e4
LT		 2763 rdev->desc_nr = -1;
2764 bind_rdev_to_array(rdev, mddev);
2765
2766 /*
2767 * The rest should better be atomic, we can have disk failures
2768 * noticed in interrupt contexts ...
2769 */
2770
2771 if (rdev->desc_nr == mddev->max_disks) {
2772 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
2773 mdname(mddev));
2774 err = -EBUSY;
2775 goto abort_unbind_export;
2776 }
2777
2778 rdev->raid_disk = -1;
2779
2780 md_update_sb(mddev);
2781
2782 /*
2783 * Kick recovery, maybe this spare has to be added to the
2784 * array immediately.
2785 */
2786 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2787 md_wakeup_thread(mddev->thread);
2788
2789 return 0;
2790
2791abort_unbind_export:
2792 unbind_rdev_from_array(rdev);
2793
2794abort_export:
2795 export_rdev(rdev);
2796 return err;
2797}
2798
32a7627c
N		 2799/* similar to deny_write_access, but accounts for our holding a reference
2800 * to the file ourselves */
2801static int deny_bitmap_write_access(struct file * file)
2802{
2803 struct inode *inode = file->f_mapping->host;
2804
2805 spin_lock(&inode->i_lock);
2806 if (atomic_read(&inode->i_writecount) > 1) {
2807 spin_unlock(&inode->i_lock);
2808 return -ETXTBSY;
2809 }
2810 atomic_set(&inode->i_writecount, -1);
2811 spin_unlock(&inode->i_lock);
2812
2813 return 0;
2814}
2815
2816static int set_bitmap_file(mddev_t *mddev, int fd)
2817{
2818 int err;
2819
36fa3063
N		 2820 if (mddev->pers) {
2821 if (!mddev->pers->quiesce)
2822 return -EBUSY;
2823 if (mddev->recovery || mddev->sync_thread)
2824 return -EBUSY;
2825 /* we should be able to change the bitmap.. */
2826 }
32a7627c 2827
32a7627c 2828
36fa3063
N		 2829 if (fd >= 0) {
2830 if (mddev->bitmap)
2831 return -EEXIST; /* cannot add when bitmap is present */
2832 mddev->bitmap_file = fget(fd);
32a7627c 2833
36fa3063
N		 2834 if (mddev->bitmap_file == NULL) {
2835 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
2836 mdname(mddev));
2837 return -EBADF;
2838 }
2839
2840 err = deny_bitmap_write_access(mddev->bitmap_file);
2841 if (err) {
2842 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
2843 mdname(mddev));
2844 fput(mddev->bitmap_file);
2845 mddev->bitmap_file = NULL;
2846 return err;
2847 }
a654b9d8 2848 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 2849 } else if (mddev->bitmap == NULL)
2850 return -ENOENT; /* cannot remove what isn't there */
2851 err = 0;
2852 if (mddev->pers) {
2853 mddev->pers->quiesce(mddev, 1);
2854 if (fd >= 0)
2855 err = bitmap_create(mddev);
2856 if (fd < 0 || err)
2857 bitmap_destroy(mddev);
2858 mddev->pers->quiesce(mddev, 0);
2859 } else if (fd < 0) {
2860 if (mddev->bitmap_file)
2861 fput(mddev->bitmap_file);
2862 mddev->bitmap_file = NULL;
2863 }
2864
32a7627c
N		 2865 return err;
2866}
2867
1da177e4
LT		 2868/*
2869 * set_array_info is used two different ways
2870 * The original usage is when creating a new array.
2871 * In this usage, raid_disks is > 0 and it together with
2872 * level, size, not_persistent,layout,chunksize determine the
2873 * shape of the array.
2874 * This will always create an array with a type-0.90.0 superblock.
2875 * The newer usage is when assembling an array.
2876 * In this case raid_disks will be 0, and the major_version field is
2877 * use to determine which style super-blocks are to be found on the devices.
2878 * The minor and patch _version numbers are also kept incase the
2879 * super_block handler wishes to interpret them.
2880 */
2881static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
2882{
2883
2884 if (info->raid_disks == 0) {
2885 /* just setting version number for superblock loading */
2886 if (info->major_version < 0 ||
2887 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
2888 super_types[info->major_version].name == NULL) {
2889 /* maybe try to auto-load a module? */
2890 printk(KERN_INFO
2891 "md: superblock version %d not known\n",
2892 info->major_version);
2893 return -EINVAL;
2894 }
2895 mddev->major_version = info->major_version;
2896 mddev->minor_version = info->minor_version;
2897 mddev->patch_version = info->patch_version;
2898 return 0;
2899 }
2900 mddev->major_version = MD_MAJOR_VERSION;
2901 mddev->minor_version = MD_MINOR_VERSION;
2902 mddev->patch_version = MD_PATCHLEVEL_VERSION;
2903 mddev->ctime = get_seconds();
2904
2905 mddev->level = info->level;
2906 mddev->size = info->size;
2907 mddev->raid_disks = info->raid_disks;
2908 /* don't set md_minor, it is determined by which /dev/md* was
2909 * openned
2910 */
2911 if (info->state & (1<<MD_SB_CLEAN))
2912 mddev->recovery_cp = MaxSector;
2913 else
2914 mddev->recovery_cp = 0;
2915 mddev->persistent = ! info->not_persistent;
2916
2917 mddev->layout = info->layout;
2918 mddev->chunk_size = info->chunk_size;
2919
2920 mddev->max_disks = MD_SB_DISKS;
2921
2922 mddev->sb_dirty = 1;
2923
2924 /*
2925 * Generate a 128 bit UUID
2926 */
2927 get_random_bytes(mddev->uuid, 16);
2928
2929 return 0;
2930}
2931
2932/*
2933 * update_array_info is used to change the configuration of an
2934 * on-line array.
2935 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
2936 * fields in the info are checked against the array.
2937 * Any differences that cannot be handled will cause an error.
2938 * Normally, only one change can be managed at a time.
2939 */
2940static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
2941{
2942 int rv = 0;
2943 int cnt = 0;
36fa3063
N		 2944 int state = 0;
2945
2946 /* calculate expected state,ignoring low bits */
2947 if (mddev->bitmap && mddev->bitmap_offset)
2948 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 2949
2950 if (mddev->major_version != info->major_version ||
2951 mddev->minor_version != info->minor_version ||
2952/* mddev->patch_version != info->patch_version || */
2953 mddev->ctime != info->ctime ||
2954 mddev->level != info->level ||
2955/* mddev->layout != info->layout || */
2956 !mddev->persistent != info->not_persistent||
36fa3063
N		 2957 mddev->chunk_size != info->chunk_size ||
2958 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
2959 ((state^info->state) & 0xfffffe00)
2960 )
1da177e4
LT		 2961 return -EINVAL;
2962 /* Check there is only one change */
2963 if (mddev->size != info->size) cnt++;
2964 if (mddev->raid_disks != info->raid_disks) cnt++;
2965 if (mddev->layout != info->layout) cnt++;
36fa3063 2966 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 2967 if (cnt == 0) return 0;
2968 if (cnt > 1) return -EINVAL;
2969
2970 if (mddev->layout != info->layout) {
2971 /* Change layout
2972 * we don't need to do anything at the md level, the
2973 * personality will take care of it all.
2974 */
2975 if (mddev->pers->reconfig == NULL)
2976 return -EINVAL;
2977 else
2978 return mddev->pers->reconfig(mddev, info->layout, -1);
2979 }
2980 if (mddev->size != info->size) {
2981 mdk_rdev_t * rdev;
2982 struct list_head *tmp;
2983 if (mddev->pers->resize == NULL)
2984 return -EINVAL;
2985 /* The "size" is the amount of each device that is used.
2986 * This can only make sense for arrays with redundancy.
2987 * linear and raid0 always use whatever space is available
2988 * We can only consider changing the size if no resync
2989 * or reconstruction is happening, and if the new size
2990 * is acceptable. It must fit before the sb_offset or,
2991 * if that is <data_offset, it must fit before the
2992 * size of each device.
2993 * If size is zero, we find the largest size that fits.
2994 */
2995 if (mddev->sync_thread)
2996 return -EBUSY;
2997 ITERATE_RDEV(mddev,rdev,tmp) {
2998 sector_t avail;
2999 int fit = (info->size == 0);
3000 if (rdev->sb_offset > rdev->data_offset)
3001 avail = (rdev->sb_offset*2) - rdev->data_offset;
3002 else
3003 avail = get_capacity(rdev->bdev->bd_disk)
3004 - rdev->data_offset;
3005 if (fit && (info->size == 0 || info->size > avail/2))
3006 info->size = avail/2;
3007 if (avail < ((sector_t)info->size << 1))
3008 return -ENOSPC;
3009 }
3010 rv = mddev->pers->resize(mddev, (sector_t)info->size *2);
3011 if (!rv) {
3012 struct block_device *bdev;
3013
3014 bdev = bdget_disk(mddev->gendisk, 0);
3015 if (bdev) {
3016 down(&bdev->bd_inode->i_sem);
3017 i_size_write(bdev->bd_inode, mddev->array_size << 10);
3018 up(&bdev->bd_inode->i_sem);
3019 bdput(bdev);
3020 }
3021 }
3022 }
3023 if (mddev->raid_disks != info->raid_disks) {
3024 /* change the number of raid disks */
3025 if (mddev->pers->reshape == NULL)
3026 return -EINVAL;
3027 if (info->raid_disks <= 0 ||
3028 info->raid_disks >= mddev->max_disks)
3029 return -EINVAL;
3030 if (mddev->sync_thread)
3031 return -EBUSY;
3032 rv = mddev->pers->reshape(mddev, info->raid_disks);
3033 if (!rv) {
3034 struct block_device *bdev;
3035
3036 bdev = bdget_disk(mddev->gendisk, 0);
3037 if (bdev) {
3038 down(&bdev->bd_inode->i_sem);
3039 i_size_write(bdev->bd_inode, mddev->array_size << 10);
3040 up(&bdev->bd_inode->i_sem);
3041 bdput(bdev);
3042 }
3043 }
3044 }
36fa3063
N		 3045 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
3046 if (mddev->pers->quiesce == NULL)
3047 return -EINVAL;
3048 if (mddev->recovery || mddev->sync_thread)
3049 return -EBUSY;
3050 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
3051 /* add the bitmap */
3052 if (mddev->bitmap)
3053 return -EEXIST;
3054 if (mddev->default_bitmap_offset == 0)
3055 return -EINVAL;
3056 mddev->bitmap_offset = mddev->default_bitmap_offset;
3057 mddev->pers->quiesce(mddev, 1);
3058 rv = bitmap_create(mddev);
3059 if (rv)
3060 bitmap_destroy(mddev);
3061 mddev->pers->quiesce(mddev, 0);
3062 } else {
3063 /* remove the bitmap */
3064 if (!mddev->bitmap)
3065 return -ENOENT;
3066 if (mddev->bitmap->file)
3067 return -EINVAL;
3068 mddev->pers->quiesce(mddev, 1);
3069 bitmap_destroy(mddev);
3070 mddev->pers->quiesce(mddev, 0);
3071 mddev->bitmap_offset = 0;
3072 }
3073 }
1da177e4
LT		 3074 md_update_sb(mddev);
3075 return rv;
3076}
3077
3078static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3079{
3080 mdk_rdev_t *rdev;
3081
3082 if (mddev->pers == NULL)
3083 return -ENODEV;
3084
3085 rdev = find_rdev(mddev, dev);
3086 if (!rdev)
3087 return -ENODEV;
3088
3089 md_error(mddev, rdev);
3090 return 0;
3091}
3092
3093static int md_ioctl(struct inode *inode, struct file *file,
3094 unsigned int cmd, unsigned long arg)
3095{
3096 int err = 0;
3097 void __user *argp = (void __user *)arg;
3098 struct hd_geometry __user *loc = argp;
3099 mddev_t *mddev = NULL;
3100
3101 if (!capable(CAP_SYS_ADMIN))
3102 return -EACCES;
3103
3104 /*
3105 * Commands dealing with the RAID driver but not any
3106 * particular array:
3107 */
3108 switch (cmd)
3109 {
3110 case RAID_VERSION:
3111 err = get_version(argp);
3112 goto done;
3113
3114 case PRINT_RAID_DEBUG:
3115 err = 0;
3116 md_print_devices();
3117 goto done;
3118
3119#ifndef MODULE
3120 case RAID_AUTORUN:
3121 err = 0;
3122 autostart_arrays(arg);
3123 goto done;
3124#endif
3125 default:;
3126 }
3127
3128 /*
3129 * Commands creating/starting a new array:
3130 */
3131
3132 mddev = inode->i_bdev->bd_disk->private_data;
3133
3134 if (!mddev) {
3135 BUG();
3136 goto abort;
3137 }
3138
3139
3140 if (cmd == START_ARRAY) {
3141 /* START_ARRAY doesn't need to lock the array as autostart_array
3142 * does the locking, and it could even be a different array
3143 */
3144 static int cnt = 3;
3145 if (cnt > 0 ) {
3146 printk(KERN_WARNING
3147 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
3148 "This will not be supported beyond 2.6\n",
3149 current->comm, current->pid);
3150 cnt--;
3151 }
3152 err = autostart_array(new_decode_dev(arg));
3153 if (err) {
3154 printk(KERN_WARNING "md: autostart failed!\n");
3155 goto abort;
3156 }
3157 goto done;
3158 }
3159
3160 err = mddev_lock(mddev);
3161 if (err) {
3162 printk(KERN_INFO
3163 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3164 err, cmd);
3165 goto abort;
3166 }
3167
3168 switch (cmd)
3169 {
3170 case SET_ARRAY_INFO:
3171 {
3172 mdu_array_info_t info;
3173 if (!arg)
3174 memset(&info, 0, sizeof(info));
3175 else if (copy_from_user(&info, argp, sizeof(info))) {
3176 err = -EFAULT;
3177 goto abort_unlock;
3178 }
3179 if (mddev->pers) {
3180 err = update_array_info(mddev, &info);
3181 if (err) {
3182 printk(KERN_WARNING "md: couldn't update"
3183 " array info. %d\n", err);
3184 goto abort_unlock;
3185 }
3186 goto done_unlock;
3187 }
3188 if (!list_empty(&mddev->disks)) {
3189 printk(KERN_WARNING
3190 "md: array %s already has disks!\n",
3191 mdname(mddev));
3192 err = -EBUSY;
3193 goto abort_unlock;
3194 }
3195 if (mddev->raid_disks) {
3196 printk(KERN_WARNING
3197 "md: array %s already initialised!\n",
3198 mdname(mddev));
3199 err = -EBUSY;
3200 goto abort_unlock;
3201 }
3202 err = set_array_info(mddev, &info);
3203 if (err) {
3204 printk(KERN_WARNING "md: couldn't set"
3205 " array info. %d\n", err);
3206 goto abort_unlock;
3207 }
3208 }
3209 goto done_unlock;
3210
3211 default:;
3212 }
3213
3214 /*
3215 * Commands querying/configuring an existing array:
3216 */
32a7627c
N		 3217 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3218 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3219 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3220 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
1da177e4
LT		 3221 err = -ENODEV;
3222 goto abort_unlock;
3223 }
3224
3225 /*
3226 * Commands even a read-only array can execute:
3227 */
3228 switch (cmd)
3229 {
3230 case GET_ARRAY_INFO:
3231 err = get_array_info(mddev, argp);
3232 goto done_unlock;
3233
32a7627c 3234 case GET_BITMAP_FILE:
87162a28 3235 err = get_bitmap_file(mddev, argp);
32a7627c
N		 3236 goto done_unlock;
3237
1da177e4
LT		 3238 case GET_DISK_INFO:
3239 err = get_disk_info(mddev, argp);
3240 goto done_unlock;
3241
3242 case RESTART_ARRAY_RW:
3243 err = restart_array(mddev);
3244 goto done_unlock;
3245
3246 case STOP_ARRAY:
3247 err = do_md_stop (mddev, 0);
3248 goto done_unlock;
3249
3250 case STOP_ARRAY_RO:
3251 err = do_md_stop (mddev, 1);
3252 goto done_unlock;
3253
3254 /*
3255 * We have a problem here : there is no easy way to give a CHS
3256 * virtual geometry. We currently pretend that we have a 2 heads
3257 * 4 sectors (with a BIG number of cylinders...). This drives
3258 * dosfs just mad... ;-)
3259 */
3260 case HDIO_GETGEO:
3261 if (!loc) {
3262 err = -EINVAL;
3263 goto abort_unlock;
3264 }
3265 err = put_user (2, (char __user *) &loc->heads);
3266 if (err)
3267 goto abort_unlock;
3268 err = put_user (4, (char __user *) &loc->sectors);
3269 if (err)
3270 goto abort_unlock;
3271 err = put_user(get_capacity(mddev->gendisk)/8,
3272 (short __user *) &loc->cylinders);
3273 if (err)
3274 goto abort_unlock;
3275 err = put_user (get_start_sect(inode->i_bdev),
3276 (long __user *) &loc->start);
3277 goto done_unlock;
3278 }
3279
3280 /*
3281 * The remaining ioctls are changing the state of the
f91de92e
N		 3282 * superblock, so we do not allow them on read-only arrays.
3283 * However non-MD ioctls (e.g. get-size) will still come through
3284 * here and hit the 'default' below, so only disallow
3285 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 3286 */
f91de92e
N		 3287 if (_IOC_TYPE(cmd) == MD_MAJOR &&
3288 mddev->ro && mddev->pers) {
3289 if (mddev->ro == 2) {
3290 mddev->ro = 0;
3291 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3292 md_wakeup_thread(mddev->thread);
3293
3294 } else {
3295 err = -EROFS;
3296 goto abort_unlock;
3297 }
1da177e4
LT		 3298 }
3299
3300 switch (cmd)
3301 {
3302 case ADD_NEW_DISK:
3303 {
3304 mdu_disk_info_t info;
3305 if (copy_from_user(&info, argp, sizeof(info)))
3306 err = -EFAULT;
3307 else
3308 err = add_new_disk(mddev, &info);
3309 goto done_unlock;
3310 }
3311
3312 case HOT_REMOVE_DISK:
3313 err = hot_remove_disk(mddev, new_decode_dev(arg));
3314 goto done_unlock;
3315
3316 case HOT_ADD_DISK:
3317 err = hot_add_disk(mddev, new_decode_dev(arg));
3318 goto done_unlock;
3319
3320 case SET_DISK_FAULTY:
3321 err = set_disk_faulty(mddev, new_decode_dev(arg));
3322 goto done_unlock;
3323
3324 case RUN_ARRAY:
3325 err = do_md_run (mddev);
3326 goto done_unlock;
3327
32a7627c
N		 3328 case SET_BITMAP_FILE:
3329 err = set_bitmap_file(mddev, (int)arg);
3330 goto done_unlock;
3331
1da177e4
LT		 3332 default:
3333 if (_IOC_TYPE(cmd) == MD_MAJOR)
3334 printk(KERN_WARNING "md: %s(pid %d) used"
3335 " obsolete MD ioctl, upgrade your"
3336 " software to use new ictls.\n",
3337 current->comm, current->pid);
3338 err = -EINVAL;
3339 goto abort_unlock;
3340 }
3341
3342done_unlock:
3343abort_unlock:
3344 mddev_unlock(mddev);
3345
3346 return err;
3347done:
3348 if (err)
3349 MD_BUG();
3350abort:
3351 return err;
3352}
3353
3354static int md_open(struct inode *inode, struct file *file)
3355{
3356 /*
3357 * Succeed if we can lock the mddev, which confirms that
3358 * it isn't being stopped right now.
3359 */
3360 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3361 int err;
3362
3363 if ((err = mddev_lock(mddev)))
3364 goto out;
3365
3366 err = 0;
3367 mddev_get(mddev);
3368 mddev_unlock(mddev);
3369
3370 check_disk_change(inode->i_bdev);
3371 out:
3372 return err;
3373}
3374
3375static int md_release(struct inode *inode, struct file * file)
3376{
3377 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3378
3379 if (!mddev)
3380 BUG();
3381 mddev_put(mddev);
3382
3383 return 0;
3384}
3385
3386static int md_media_changed(struct gendisk *disk)
3387{
3388 mddev_t *mddev = disk->private_data;
3389
3390 return mddev->changed;
3391}
3392
3393static int md_revalidate(struct gendisk *disk)
3394{
3395 mddev_t *mddev = disk->private_data;
3396
3397 mddev->changed = 0;
3398 return 0;
3399}
3400static struct block_device_operations md_fops =
3401{
3402 .owner = THIS_MODULE,
3403 .open = md_open,
3404 .release = md_release,
3405 .ioctl = md_ioctl,
3406 .media_changed = md_media_changed,
3407 .revalidate_disk= md_revalidate,
3408};
3409
75c96f85 3410static int md_thread(void * arg)
1da177e4
LT		 3411{
3412 mdk_thread_t *thread = arg;
3413
1da177e4
LT		 3414 /*
3415 * md_thread is a 'system-thread', it's priority should be very
3416 * high. We avoid resource deadlocks individually in each
3417 * raid personality. (RAID5 does preallocation) We also use RR and
3418 * the very same RT priority as kswapd, thus we will never get
3419 * into a priority inversion deadlock.
3420 *
3421 * we definitely have to have equal or higher priority than
3422 * bdflush, otherwise bdflush will deadlock if there are too
3423 * many dirty RAID5 blocks.
3424 */
1da177e4 3425
6985c43f 3426 allow_signal(SIGKILL);
1da177e4 3427 complete(thread->event);
a6fb0934 3428 while (!kthread_should_stop()) {
1da177e4
LT		 3429 void (*run)(mddev_t *);
3430
32a7627c 3431 wait_event_interruptible_timeout(thread->wqueue,
a6fb0934
N		 3432 test_bit(THREAD_WAKEUP, &thread->flags)
3433 || kthread_should_stop(),
32a7627c 3434 thread->timeout);
3e1d1d28 3435 try_to_freeze();
1da177e4
LT		 3436
3437 clear_bit(THREAD_WAKEUP, &thread->flags);
3438
3439 run = thread->run;
3440 if (run)
3441 run(thread->mddev);
1da177e4 3442 }
a6fb0934 3443
1da177e4
LT		 3444 return 0;
3445}
3446
3447void md_wakeup_thread(mdk_thread_t *thread)
3448{
3449 if (thread) {
3450 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
3451 set_bit(THREAD_WAKEUP, &thread->flags);
3452 wake_up(&thread->wqueue);
3453 }
3454}
3455
3456mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
3457 const char *name)
3458{
3459 mdk_thread_t *thread;
1da177e4
LT		 3460 struct completion event;
3461
a6fb0934 3462 thread = kmalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 3463 if (!thread)
3464 return NULL;
3465
3466 memset(thread, 0, sizeof(mdk_thread_t));
3467 init_waitqueue_head(&thread->wqueue);
3468
3469 init_completion(&event);
3470 thread->event = &event;
3471 thread->run = run;
3472 thread->mddev = mddev;
3473 thread->name = name;
32a7627c 3474 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 3475 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 3476 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 3477 kfree(thread);
3478 return NULL;
3479 }
3480 wait_for_completion(&event);
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:
8712e553
N		 3944 if (signal_pending(current) ||
3945 kthread_should_stop()) {
1da177e4 3946 flush_signals(current);
6985c43f 3947 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 3948 goto skip;
3949 }
3950 ITERATE_MDDEV(mddev2,tmp) {
1da177e4
LT		 3951 if (mddev2 == mddev)
3952 continue;
3953 if (mddev2->curr_resync &&
3954 match_mddev_units(mddev,mddev2)) {
3955 DEFINE_WAIT(wq);
3956 if (mddev < mddev2 && mddev->curr_resync == 2) {
3957 /* arbitrarily yield */
3958 mddev->curr_resync = 1;
3959 wake_up(&resync_wait);
3960 }
3961 if (mddev > mddev2 && mddev->curr_resync == 1)
3962 /* no need to wait here, we can wait the next
3963 * time 'round when curr_resync == 2
3964 */
3965 continue;
3966 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8712e553
N		 3967 if (!signal_pending(current) &&
3968 !kthread_should_stop() &&
3969 mddev2->curr_resync >= mddev->curr_resync) {
1da177e4
LT		 3970 printk(KERN_INFO "md: delaying resync of %s"
3971 " until %s has finished resync (they"
3972 " share one or more physical units)\n",
3973 mdname(mddev), mdname(mddev2));
3974 mddev_put(mddev2);
3975 schedule();
3976 finish_wait(&resync_wait, &wq);
3977 goto try_again;
3978 }
3979 finish_wait(&resync_wait, &wq);
3980 }
3981 }
3982 } while (mddev->curr_resync < 2);
3983
9d88883e 3984 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 3985 /* resync follows the size requested by the personality,
57afd89f 3986 * which defaults to physical size, but can be virtual size
1da177e4
LT		 3987 */
3988 max_sectors = mddev->resync_max_sectors;
9d88883e
N		 3989 mddev->resync_mismatches = 0;
3990 } else
1da177e4
LT		 3991 /* recovery follows the physical size of devices */
3992 max_sectors = mddev->size << 1;
3993
3994 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
3995 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
3996 " %d KB/sec/disc.\n", sysctl_speed_limit_min);
338cec32 3997 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
1da177e4
LT		 3998 "(but not more than %d KB/sec) for reconstruction.\n",
3999 sysctl_speed_limit_max);
4000
4001 is_mddev_idle(mddev); /* this also initializes IO event counters */
32a7627c 4002 /* we don't use the checkpoint if there's a bitmap */
24dd469d
N		 4003 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap
4004 && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
1da177e4
LT		 4005 j = mddev->recovery_cp;
4006 else
4007 j = 0;
57afd89f 4008 io_sectors = 0;
1da177e4
LT		 4009 for (m = 0; m < SYNC_MARKS; m++) {
4010 mark[m] = jiffies;
57afd89f 4011 mark_cnt[m] = io_sectors;
1da177e4
LT		 4012 }
4013 last_mark = 0;
4014 mddev->resync_mark = mark[last_mark];
4015 mddev->resync_mark_cnt = mark_cnt[last_mark];
4016
4017 /*
4018 * Tune reconstruction:
4019 */
4020 window = 32*(PAGE_SIZE/512);
4021 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
4022 window/2,(unsigned long long) max_sectors/2);
4023
4024 atomic_set(&mddev->recovery_active, 0);
4025 init_waitqueue_head(&mddev->recovery_wait);
4026 last_check = 0;
4027
4028 if (j>2) {
4029 printk(KERN_INFO
4030 "md: resuming recovery of %s from checkpoint.\n",
4031 mdname(mddev));
4032 mddev->curr_resync = j;
4033 }
4034
4035 while (j < max_sectors) {
57afd89f 4036 sector_t sectors;
1da177e4 4037
57afd89f
N		 4038 skipped = 0;
4039 sectors = mddev->pers->sync_request(mddev, j, &skipped,
4040 currspeed < sysctl_speed_limit_min);
4041 if (sectors == 0) {
1da177e4
LT		 4042 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4043 goto out;
4044 }
57afd89f
N		 4045
4046 if (!skipped) { /* actual IO requested */
4047 io_sectors += sectors;
4048 atomic_add(sectors, &mddev->recovery_active);
4049 }
4050
1da177e4
LT		 4051 j += sectors;
4052 if (j>1) mddev->curr_resync = j;
4053
57afd89f
N		 4054
4055 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 4056 continue;
4057
57afd89f 4058 last_check = io_sectors;
1da177e4
LT		 4059
4060 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
4061 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
4062 break;
4063
4064 repeat:
4065 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
4066 /* step marks */
4067 int next = (last_mark+1) % SYNC_MARKS;
4068
4069 mddev->resync_mark = mark[next];
4070 mddev->resync_mark_cnt = mark_cnt[next];
4071 mark[next] = jiffies;
57afd89f 4072 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 4073 last_mark = next;
4074 }
4075
4076
8712e553 4077 if (signal_pending(current) || kthread_should_stop()) {
1da177e4
LT		 4078 /*
4079 * got a signal, exit.
4080 */
4081 printk(KERN_INFO
4082 "md: md_do_sync() got signal ... exiting\n");
4083 flush_signals(current);
4084 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4085 goto out;
4086 }
4087
4088 /*
4089 * this loop exits only if either when we are slower than
4090 * the 'hard' speed limit, or the system was IO-idle for
4091 * a jiffy.
4092 * the system might be non-idle CPU-wise, but we only care
4093 * about not overloading the IO subsystem. (things like an
4094 * e2fsck being done on the RAID array should execute fast)
4095 */
4096 mddev->queue->unplug_fn(mddev->queue);
4097 cond_resched();
4098
57afd89f
N		 4099 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
4100 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4
LT		 4101
4102 if (currspeed > sysctl_speed_limit_min) {
4103 if ((currspeed > sysctl_speed_limit_max) ||
4104 !is_mddev_idle(mddev)) {
4105 msleep_interruptible(250);
4106 goto repeat;
4107 }
4108 }
4109 }
4110 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
4111 /*
4112 * this also signals 'finished resyncing' to md_stop
4113 */
4114 out:
4115 mddev->queue->unplug_fn(mddev->queue);
4116
4117 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
4118
4119 /* tell personality that we are finished */
57afd89f 4120 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 4121
4122 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4123 mddev->curr_resync > 2 &&
4124 mddev->curr_resync >= mddev->recovery_cp) {
4125 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4126 printk(KERN_INFO
4127 "md: checkpointing recovery of %s.\n",
4128 mdname(mddev));
4129 mddev->recovery_cp = mddev->curr_resync;
4130 } else
4131 mddev->recovery_cp = MaxSector;
4132 }
4133
1da177e4
LT		 4134 skip:
4135 mddev->curr_resync = 0;
4136 wake_up(&resync_wait);
4137 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
4138 md_wakeup_thread(mddev->thread);
4139}
4140
4141
4142/*
4143 * This routine is regularly called by all per-raid-array threads to
4144 * deal with generic issues like resync and super-block update.
4145 * Raid personalities that don't have a thread (linear/raid0) do not
4146 * need this as they never do any recovery or update the superblock.
4147 *
4148 * It does not do any resync itself, but rather "forks" off other threads
4149 * to do that as needed.
4150 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4151 * "->recovery" and create a thread at ->sync_thread.
4152 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4153 * and wakeups up this thread which will reap the thread and finish up.
4154 * This thread also removes any faulty devices (with nr_pending == 0).
4155 *
4156 * The overall approach is:
4157 * 1/ if the superblock needs updating, update it.
4158 * 2/ If a recovery thread is running, don't do anything else.
4159 * 3/ If recovery has finished, clean up, possibly marking spares active.
4160 * 4/ If there are any faulty devices, remove them.
4161 * 5/ If array is degraded, try to add spares devices
4162 * 6/ If array has spares or is not in-sync, start a resync thread.
4163 */
4164void md_check_recovery(mddev_t *mddev)
4165{
4166 mdk_rdev_t *rdev;
4167 struct list_head *rtmp;
4168
4169
5f40402d
N		 4170 if (mddev->bitmap)
4171 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 4172
4173 if (mddev->ro)
4174 return;
fca4d848
N		 4175
4176 if (signal_pending(current)) {
4177 if (mddev->pers->sync_request) {
4178 printk(KERN_INFO "md: %s in immediate safe mode\n",
4179 mdname(mddev));
4180 mddev->safemode = 2;
4181 }
4182 flush_signals(current);
4183 }
4184
1da177e4
LT		 4185 if ( ! (
4186 mddev->sb_dirty ||
4187 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848
N		 4188 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
4189 (mddev->safemode == 1) ||
4190 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
4191 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 4192 ))
4193 return;
fca4d848 4194
1da177e4
LT		 4195 if (mddev_trylock(mddev)==0) {
4196 int spares =0;
fca4d848 4197
a9701a30 4198 spin_lock_irq(&mddev->write_lock);
fca4d848
N		 4199 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
4200 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
4201 mddev->in_sync = 1;
4202 mddev->sb_dirty = 1;
4203 }
4204 if (mddev->safemode == 1)
4205 mddev->safemode = 0;
a9701a30 4206 spin_unlock_irq(&mddev->write_lock);
fca4d848 4207
1da177e4
LT		 4208 if (mddev->sb_dirty)
4209 md_update_sb(mddev);
06d91a5f 4210
06d91a5f 4211
1da177e4
LT		 4212 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4213 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
4214 /* resync/recovery still happening */
4215 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4216 goto unlock;
4217 }
4218 if (mddev->sync_thread) {
4219 /* resync has finished, collect result */
4220 md_unregister_thread(mddev->sync_thread);
4221 mddev->sync_thread = NULL;
4222 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4223 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4224 /* success...*/
4225 /* activate any spares */
4226 mddev->pers->spare_active(mddev);
4227 }
4228 md_update_sb(mddev);
41158c7e
N		 4229
4230 /* if array is no-longer degraded, then any saved_raid_disk
4231 * information must be scrapped
4232 */
4233 if (!mddev->degraded)
4234 ITERATE_RDEV(mddev,rdev,rtmp)
4235 rdev->saved_raid_disk = -1;
4236
1da177e4
LT		 4237 mddev->recovery = 0;
4238 /* flag recovery needed just to double check */
4239 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4240 goto unlock;
4241 }
24dd469d
N		 4242 /* Clear some bits that don't mean anything, but
4243 * might be left set
4244 */
4245 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4246 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
4247 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
4248 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4
LT		 4249
4250 /* no recovery is running.
4251 * remove any failed drives, then
4252 * add spares if possible.
4253 * Spare are also removed and re-added, to allow
4254 * the personality to fail the re-add.
4255 */
4256 ITERATE_RDEV(mddev,rdev,rtmp)
4257 if (rdev->raid_disk >= 0 &&
b2d444d7 4258 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
1da177e4 4259 atomic_read(&rdev->nr_pending)==0) {
86e6ffdd
N		 4260 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
4261 char nm[20];
4262 sprintf(nm,"rd%d", rdev->raid_disk);
4263 sysfs_remove_link(&mddev->kobj, nm);
1da177e4 4264 rdev->raid_disk = -1;
86e6ffdd 4265 }
1da177e4
LT		 4266 }
4267
4268 if (mddev->degraded) {
4269 ITERATE_RDEV(mddev,rdev,rtmp)
4270 if (rdev->raid_disk < 0
b2d444d7 4271 && !test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 4272 if (mddev->pers->hot_add_disk(mddev,rdev)) {
4273 char nm[20];
4274 sprintf(nm, "rd%d", rdev->raid_disk);
4275 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
1da177e4 4276 spares++;
86e6ffdd 4277 } else
1da177e4
LT		 4278 break;
4279 }
4280 }
4281
24dd469d
N		 4282 if (spares) {
4283 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4284 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4285 } else if (mddev->recovery_cp < MaxSector) {
4286 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4287 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4288 /* nothing to be done ... */
1da177e4 4289 goto unlock;
24dd469d 4290
1da177e4
LT		 4291 if (mddev->pers->sync_request) {
4292 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 4293 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
4294 /* We are adding a device or devices to an array
4295 * which has the bitmap stored on all devices.
4296 * So make sure all bitmap pages get written
4297 */
4298 bitmap_write_all(mddev->bitmap);
4299 }
1da177e4
LT		 4300 mddev->sync_thread = md_register_thread(md_do_sync,
4301 mddev,
4302 "%s_resync");
4303 if (!mddev->sync_thread) {
4304 printk(KERN_ERR "%s: could not start resync"
4305 " thread...\n",
4306 mdname(mddev));
4307 /* leave the spares where they are, it shouldn't hurt */
4308 mddev->recovery = 0;
4309 } else {
4310 md_wakeup_thread(mddev->sync_thread);
4311 }
4312 }
4313 unlock:
4314 mddev_unlock(mddev);
4315 }
4316}
4317
75c96f85
AB		 4318static int md_notify_reboot(struct notifier_block *this,
4319 unsigned long code, void *x)
1da177e4
LT		 4320{
4321 struct list_head *tmp;
4322 mddev_t *mddev;
4323
4324 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
4325
4326 printk(KERN_INFO "md: stopping all md devices.\n");
4327
4328 ITERATE_MDDEV(mddev,tmp)
4329 if (mddev_trylock(mddev)==0)
4330 do_md_stop (mddev, 1);
4331 /*
4332 * certain more exotic SCSI devices are known to be
4333 * volatile wrt too early system reboots. While the
4334 * right place to handle this issue is the given
4335 * driver, we do want to have a safe RAID driver ...
4336 */
4337 mdelay(1000*1);
4338 }
4339 return NOTIFY_DONE;
4340}
4341
75c96f85 4342static struct notifier_block md_notifier = {
1da177e4
LT		 4343 .notifier_call = md_notify_reboot,
4344 .next = NULL,
4345 .priority = INT_MAX, /* before any real devices */
4346};
4347
4348static void md_geninit(void)
4349{
4350 struct proc_dir_entry *p;
4351
4352 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
4353
4354 p = create_proc_entry("mdstat", S_IRUGO, NULL);
4355 if (p)
4356 p->proc_fops = &md_seq_fops;
4357}
4358
75c96f85 4359static int __init md_init(void)
1da177e4
LT		 4360{
4361 int minor;
4362
4363 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4364 " MD_SB_DISKS=%d\n",
4365 MD_MAJOR_VERSION, MD_MINOR_VERSION,
4366 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
bd926c63 4367 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
32a7627c 4368 BITMAP_MINOR);
1da177e4
LT		 4369
4370 if (register_blkdev(MAJOR_NR, "md"))
4371 return -1;
4372 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
4373 unregister_blkdev(MAJOR_NR, "md");
4374 return -1;
4375 }
4376 devfs_mk_dir("md");
4377 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
4378 md_probe, NULL, NULL);
4379 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
4380 md_probe, NULL, NULL);
4381
4382 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4383 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
4384 S_IFBLK|S_IRUSR|S_IWUSR,
4385 "md/%d", minor);
4386
4387 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4388 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
4389 S_IFBLK|S_IRUSR|S_IWUSR,
4390 "md/mdp%d", minor);
4391
4392
4393 register_reboot_notifier(&md_notifier);
4394 raid_table_header = register_sysctl_table(raid_root_table, 1);
4395
4396 md_geninit();
4397 return (0);
4398}
4399
4400
4401#ifndef MODULE
4402
4403/*
4404 * Searches all registered partitions for autorun RAID arrays
4405 * at boot time.
4406 */
4407static dev_t detected_devices[128];
4408static int dev_cnt;
4409
4410void md_autodetect_dev(dev_t dev)
4411{
4412 if (dev_cnt >= 0 && dev_cnt < 127)
4413 detected_devices[dev_cnt++] = dev;
4414}
4415
4416
4417static void autostart_arrays(int part)
4418{
4419 mdk_rdev_t *rdev;
4420 int i;
4421
4422 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
4423
4424 for (i = 0; i < dev_cnt; i++) {
4425 dev_t dev = detected_devices[i];
4426
4427 rdev = md_import_device(dev,0, 0);
4428 if (IS_ERR(rdev))
4429 continue;
4430
b2d444d7 4431 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4432 MD_BUG();
4433 continue;
4434 }
4435 list_add(&rdev->same_set, &pending_raid_disks);
4436 }
4437 dev_cnt = 0;
4438
4439 autorun_devices(part);
4440}
4441
4442#endif
4443
4444static __exit void md_exit(void)
4445{
4446 mddev_t *mddev;
4447 struct list_head *tmp;
4448 int i;
4449 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
4450 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
4451 for (i=0; i < MAX_MD_DEVS; i++)
4452 devfs_remove("md/%d", i);
4453 for (i=0; i < MAX_MD_DEVS; i++)
4454 devfs_remove("md/d%d", i);
4455
4456 devfs_remove("md");
4457
4458 unregister_blkdev(MAJOR_NR,"md");
4459 unregister_blkdev(mdp_major, "mdp");
4460 unregister_reboot_notifier(&md_notifier);
4461 unregister_sysctl_table(raid_table_header);
4462 remove_proc_entry("mdstat", NULL);
4463 ITERATE_MDDEV(mddev,tmp) {
4464 struct gendisk *disk = mddev->gendisk;
4465 if (!disk)
4466 continue;
4467 export_array(mddev);
4468 del_gendisk(disk);
4469 put_disk(disk);
4470 mddev->gendisk = NULL;
4471 mddev_put(mddev);
4472 }
4473}
4474
4475module_init(md_init)
4476module_exit(md_exit)
4477
f91de92e
N		 4478static int get_ro(char *buffer, struct kernel_param *kp)
4479{
4480 return sprintf(buffer, "%d", start_readonly);
4481}
4482static int set_ro(const char *val, struct kernel_param *kp)
4483{
4484 char *e;
4485 int num = simple_strtoul(val, &e, 10);
4486 if (*val && (*e == '\0' || *e == '\n')) {
4487 start_readonly = num;
4488 return 0;;
4489 }
4490 return -EINVAL;
4491}
4492
4493module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
4494
1da177e4
LT		 4495EXPORT_SYMBOL(register_md_personality);
4496EXPORT_SYMBOL(unregister_md_personality);
4497EXPORT_SYMBOL(md_error);
4498EXPORT_SYMBOL(md_done_sync);
4499EXPORT_SYMBOL(md_write_start);
4500EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 4501EXPORT_SYMBOL(md_register_thread);
4502EXPORT_SYMBOL(md_unregister_thread);
4503EXPORT_SYMBOL(md_wakeup_thread);
4504EXPORT_SYMBOL(md_print_devices);
4505EXPORT_SYMBOL(md_check_recovery);
4506MODULE_LICENSE("GPL");
aa1595e9 4507MODULE_ALIAS("md");
72008652 4508MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
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