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[PATCH] md: Allow raid 'layout' to be read and set via sysfs
[linux-2.6-block.git] / drivers / md / md.c
CommitLineData
1da177e4
LT		 1/*
2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
4
5 completely rewritten, based on the MD driver code from Marc Zyngier
6
7 Changes:
8
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
16
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
19
20 Neil Brown <neilb@cse.unsw.edu.au>.
21
32a7627c
N		 22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
24
1da177e4
LT		 25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
28 any later version.
29
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
33*/
34
35#include <linux/module.h>
36#include <linux/config.h>
a6fb0934 37#include <linux/kthread.h>
1da177e4
LT		 38#include <linux/linkage.h>
39#include <linux/raid/md.h>
32a7627c 40#include <linux/raid/bitmap.h>
1da177e4
LT		 41#include <linux/sysctl.h>
42#include <linux/devfs_fs_kernel.h>
43#include <linux/buffer_head.h> /* for invalidate_bdev */
44#include <linux/suspend.h>
d7603b7e 45#include <linux/poll.h>
48c9c27b 46#include <linux/mutex.h>
16f17b39 47#include <linux/ctype.h>
1da177e4
LT		 48
49#include <linux/init.h>
50
32a7627c
N		 51#include <linux/file.h>
52
1da177e4
LT		 53#ifdef CONFIG_KMOD
54#include <linux/kmod.h>
55#endif
56
57#include <asm/unaligned.h>
58
59#define MAJOR_NR MD_MAJOR
60#define MD_DRIVER
61
62/* 63 partitions with the alternate major number (mdp) */
63#define MdpMinorShift 6
64
65#define DEBUG 0
66#define dprintk(x...) ((void)(DEBUG && printk(x)))
67
68
69#ifndef MODULE
70static void autostart_arrays (int part);
71#endif
72
2604b703 73static LIST_HEAD(pers_list);
1da177e4
LT		 74static DEFINE_SPINLOCK(pers_lock);
75
5e56341d
AB		 76static void md_print_devices(void);
77
78#define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
79
1da177e4
LT		 80/*
81 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
82 * is 1000 KB/sec, so the extra system load does not show up that much.
83 * Increase it if you want to have more _guaranteed_ speed. Note that
338cec32 84 * the RAID driver will use the maximum available bandwidth if the IO
1da177e4
LT		 85 * subsystem is idle. There is also an 'absolute maximum' reconstruction
86 * speed limit - in case reconstruction slows down your system despite
87 * idle IO detection.
88 *
89 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
88202a0c 90 * or /sys/block/mdX/md/sync_speed_{min,max}
1da177e4
LT		 91 */
92
93static int sysctl_speed_limit_min = 1000;
94static int sysctl_speed_limit_max = 200000;
88202a0c
N		 95static inline int speed_min(mddev_t *mddev)
96{
97 return mddev->sync_speed_min ?
98 mddev->sync_speed_min : sysctl_speed_limit_min;
99}
100
101static inline int speed_max(mddev_t *mddev)
102{
103 return mddev->sync_speed_max ?
104 mddev->sync_speed_max : sysctl_speed_limit_max;
105}
1da177e4
LT		 106
107static struct ctl_table_header *raid_table_header;
108
109static ctl_table raid_table[] = {
110 {
111 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
112 .procname = "speed_limit_min",
113 .data = &sysctl_speed_limit_min,
114 .maxlen = sizeof(int),
115 .mode = 0644,
116 .proc_handler = &proc_dointvec,
117 },
118 {
119 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
120 .procname = "speed_limit_max",
121 .data = &sysctl_speed_limit_max,
122 .maxlen = sizeof(int),
123 .mode = 0644,
124 .proc_handler = &proc_dointvec,
125 },
126 { .ctl_name = 0 }
127};
128
129static ctl_table raid_dir_table[] = {
130 {
131 .ctl_name = DEV_RAID,
132 .procname = "raid",
133 .maxlen = 0,
134 .mode = 0555,
135 .child = raid_table,
136 },
137 { .ctl_name = 0 }
138};
139
140static ctl_table raid_root_table[] = {
141 {
142 .ctl_name = CTL_DEV,
143 .procname = "dev",
144 .maxlen = 0,
145 .mode = 0555,
146 .child = raid_dir_table,
147 },
148 { .ctl_name = 0 }
149};
150
151static struct block_device_operations md_fops;
152
f91de92e
N		 153static int start_readonly;
154
d7603b7e
N		 155/*
156 * We have a system wide 'event count' that is incremented
157 * on any 'interesting' event, and readers of /proc/mdstat
158 * can use 'poll' or 'select' to find out when the event
159 * count increases.
160 *
161 * Events are:
162 * start array, stop array, error, add device, remove device,
163 * start build, activate spare
164 */
2989ddbd 165static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
d7603b7e 166static atomic_t md_event_count;
29269553 167void md_new_event(mddev_t *mddev)
d7603b7e
N		 168{
169 atomic_inc(&md_event_count);
170 wake_up(&md_event_waiters);
4508a7a7 171 sysfs_notify(&mddev->kobj, NULL, "sync_action");
d7603b7e 172}
29269553 173EXPORT_SYMBOL_GPL(md_new_event);
d7603b7e 174
c331eb04
N		 175/* Alternate version that can be called from interrupts
176 * when calling sysfs_notify isn't needed.
177 */
178void md_new_event_inintr(mddev_t *mddev)
179{
180 atomic_inc(&md_event_count);
181 wake_up(&md_event_waiters);
182}
183
1da177e4
LT		 184/*
185 * Enables to iterate over all existing md arrays
186 * all_mddevs_lock protects this list.
187 */
188static LIST_HEAD(all_mddevs);
189static DEFINE_SPINLOCK(all_mddevs_lock);
190
191
192/*
193 * iterates through all used mddevs in the system.
194 * We take care to grab the all_mddevs_lock whenever navigating
195 * the list, and to always hold a refcount when unlocked.
196 * Any code which breaks out of this loop while own
197 * a reference to the current mddev and must mddev_put it.
198 */
199#define ITERATE_MDDEV(mddev,tmp) \
200 \
201 for (({ spin_lock(&all_mddevs_lock); \
202 tmp = all_mddevs.next; \
203 mddev = NULL;}); \
204 ({ if (tmp != &all_mddevs) \
205 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
206 spin_unlock(&all_mddevs_lock); \
207 if (mddev) mddev_put(mddev); \
208 mddev = list_entry(tmp, mddev_t, all_mddevs); \
209 tmp != &all_mddevs;}); \
210 ({ spin_lock(&all_mddevs_lock); \
211 tmp = tmp->next;}) \
212 )
213
214
215static int md_fail_request (request_queue_t *q, struct bio *bio)
216{
217 bio_io_error(bio, bio->bi_size);
218 return 0;
219}
220
221static inline mddev_t *mddev_get(mddev_t *mddev)
222{
223 atomic_inc(&mddev->active);
224 return mddev;
225}
226
227static void mddev_put(mddev_t *mddev)
228{
229 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
230 return;
231 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
232 list_del(&mddev->all_mddevs);
926ce2d8 233 spin_unlock(&all_mddevs_lock);
1312f40e 234 blk_cleanup_queue(mddev->queue);
eae1701f 235 kobject_unregister(&mddev->kobj);
926ce2d8
N		 236 } else
237 spin_unlock(&all_mddevs_lock);
1da177e4
LT		 238}
239
240static mddev_t * mddev_find(dev_t unit)
241{
242 mddev_t *mddev, *new = NULL;
243
244 retry:
245 spin_lock(&all_mddevs_lock);
246 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
247 if (mddev->unit == unit) {
248 mddev_get(mddev);
249 spin_unlock(&all_mddevs_lock);
990a8baf 250 kfree(new);
1da177e4
LT		 251 return mddev;
252 }
253
254 if (new) {
255 list_add(&new->all_mddevs, &all_mddevs);
256 spin_unlock(&all_mddevs_lock);
257 return new;
258 }
259 spin_unlock(&all_mddevs_lock);
260
9ffae0cf 261 new = kzalloc(sizeof(*new), GFP_KERNEL);
1da177e4
LT		 262 if (!new)
263 return NULL;
264
1da177e4
LT		 265 new->unit = unit;
266 if (MAJOR(unit) == MD_MAJOR)
267 new->md_minor = MINOR(unit);
268 else
269 new->md_minor = MINOR(unit) >> MdpMinorShift;
270
df5b89b3 271 mutex_init(&new->reconfig_mutex);
1da177e4
LT		 272 INIT_LIST_HEAD(&new->disks);
273 INIT_LIST_HEAD(&new->all_mddevs);
274 init_timer(&new->safemode_timer);
275 atomic_set(&new->active, 1);
06d91a5f 276 spin_lock_init(&new->write_lock);
3d310eb7 277 init_waitqueue_head(&new->sb_wait);
1da177e4
LT		 278
279 new->queue = blk_alloc_queue(GFP_KERNEL);
280 if (!new->queue) {
281 kfree(new);
282 return NULL;
283 }
89e5c8b5 284 set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags);
1da177e4
LT		 285
286 blk_queue_make_request(new->queue, md_fail_request);
287
288 goto retry;
289}
290
291static inline int mddev_lock(mddev_t * mddev)
292{
df5b89b3 293 return mutex_lock_interruptible(&mddev->reconfig_mutex);
1da177e4
LT		 294}
295
1da177e4
LT		 296static inline int mddev_trylock(mddev_t * mddev)
297{
df5b89b3 298 return mutex_trylock(&mddev->reconfig_mutex);
1da177e4
LT		 299}
300
301static inline void mddev_unlock(mddev_t * mddev)
302{
df5b89b3 303 mutex_unlock(&mddev->reconfig_mutex);
1da177e4 304
005eca5e 305 md_wakeup_thread(mddev->thread);
1da177e4
LT		 306}
307
2989ddbd 308static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
1da177e4
LT		 309{
310 mdk_rdev_t * rdev;
311 struct list_head *tmp;
312
313 ITERATE_RDEV(mddev,rdev,tmp) {
314 if (rdev->desc_nr == nr)
315 return rdev;
316 }
317 return NULL;
318}
319
320static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
321{
322 struct list_head *tmp;
323 mdk_rdev_t *rdev;
324
325 ITERATE_RDEV(mddev,rdev,tmp) {
326 if (rdev->bdev->bd_dev == dev)
327 return rdev;
328 }
329 return NULL;
330}
331
d9d166c2 332static struct mdk_personality *find_pers(int level, char *clevel)
2604b703
N		 333{
334 struct mdk_personality *pers;
d9d166c2
N		 335 list_for_each_entry(pers, &pers_list, list) {
336 if (level != LEVEL_NONE && pers->level == level)
2604b703 337 return pers;
d9d166c2
N		 338 if (strcmp(pers->name, clevel)==0)
339 return pers;
340 }
2604b703
N		 341 return NULL;
342}
343
77933d72 344static inline sector_t calc_dev_sboffset(struct block_device *bdev)
1da177e4
LT		 345{
346 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
347 return MD_NEW_SIZE_BLOCKS(size);
348}
349
350static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
351{
352 sector_t size;
353
354 size = rdev->sb_offset;
355
356 if (chunk_size)
357 size &= ~((sector_t)chunk_size/1024 - 1);
358 return size;
359}
360
361static int alloc_disk_sb(mdk_rdev_t * rdev)
362{
363 if (rdev->sb_page)
364 MD_BUG();
365
366 rdev->sb_page = alloc_page(GFP_KERNEL);
367 if (!rdev->sb_page) {
368 printk(KERN_ALERT "md: out of memory.\n");
369 return -EINVAL;
370 }
371
372 return 0;
373}
374
375static void free_disk_sb(mdk_rdev_t * rdev)
376{
377 if (rdev->sb_page) {
2d1f3b5d 378 put_page(rdev->sb_page);
1da177e4
LT		 379 rdev->sb_loaded = 0;
380 rdev->sb_page = NULL;
381 rdev->sb_offset = 0;
382 rdev->size = 0;
383 }
384}
385
386
7bfa19f2
N		 387static int super_written(struct bio *bio, unsigned int bytes_done, int error)
388{
389 mdk_rdev_t *rdev = bio->bi_private;
a9701a30 390 mddev_t *mddev = rdev->mddev;
7bfa19f2
N		 391 if (bio->bi_size)
392 return 1;
393
394 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags))
a9701a30 395 md_error(mddev, rdev);
7bfa19f2 396
a9701a30
N		 397 if (atomic_dec_and_test(&mddev->pending_writes))
398 wake_up(&mddev->sb_wait);
f8b58edf 399 bio_put(bio);
7bfa19f2
N		 400 return 0;
401}
402
a9701a30
N		 403static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
404{
405 struct bio *bio2 = bio->bi_private;
406 mdk_rdev_t *rdev = bio2->bi_private;
407 mddev_t *mddev = rdev->mddev;
408 if (bio->bi_size)
409 return 1;
410
411 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
412 error == -EOPNOTSUPP) {
413 unsigned long flags;
414 /* barriers don't appear to be supported :-( */
415 set_bit(BarriersNotsupp, &rdev->flags);
416 mddev->barriers_work = 0;
417 spin_lock_irqsave(&mddev->write_lock, flags);
418 bio2->bi_next = mddev->biolist;
419 mddev->biolist = bio2;
420 spin_unlock_irqrestore(&mddev->write_lock, flags);
421 wake_up(&mddev->sb_wait);
422 bio_put(bio);
423 return 0;
424 }
425 bio_put(bio2);
426 bio->bi_private = rdev;
427 return super_written(bio, bytes_done, error);
428}
429
7bfa19f2
N		 430void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
431 sector_t sector, int size, struct page *page)
432{
433 /* write first size bytes of page to sector of rdev
434 * Increment mddev->pending_writes before returning
435 * and decrement it on completion, waking up sb_wait
436 * if zero is reached.
437 * If an error occurred, call md_error
a9701a30
N		 438 *
439 * As we might need to resubmit the request if BIO_RW_BARRIER
440 * causes ENOTSUPP, we allocate a spare bio...
7bfa19f2
N		 441 */
442 struct bio *bio = bio_alloc(GFP_NOIO, 1);
a9701a30 443 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
7bfa19f2
N		 444
445 bio->bi_bdev = rdev->bdev;
446 bio->bi_sector = sector;
447 bio_add_page(bio, page, size, 0);
448 bio->bi_private = rdev;
449 bio->bi_end_io = super_written;
a9701a30
N		 450 bio->bi_rw = rw;
451
7bfa19f2 452 atomic_inc(&mddev->pending_writes);
a9701a30
N		 453 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
454 struct bio *rbio;
455 rw |= (1<<BIO_RW_BARRIER);
456 rbio = bio_clone(bio, GFP_NOIO);
457 rbio->bi_private = bio;
458 rbio->bi_end_io = super_written_barrier;
459 submit_bio(rw, rbio);
460 } else
461 submit_bio(rw, bio);
462}
463
464void md_super_wait(mddev_t *mddev)
465{
466 /* wait for all superblock writes that were scheduled to complete.
467 * if any had to be retried (due to BARRIER problems), retry them
468 */
469 DEFINE_WAIT(wq);
470 for(;;) {
471 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
472 if (atomic_read(&mddev->pending_writes)==0)
473 break;
474 while (mddev->biolist) {
475 struct bio *bio;
476 spin_lock_irq(&mddev->write_lock);
477 bio = mddev->biolist;
478 mddev->biolist = bio->bi_next ;
479 bio->bi_next = NULL;
480 spin_unlock_irq(&mddev->write_lock);
481 submit_bio(bio->bi_rw, bio);
482 }
483 schedule();
484 }
485 finish_wait(&mddev->sb_wait, &wq);
7bfa19f2
N		 486}
487
1da177e4
LT		 488static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
489{
490 if (bio->bi_size)
491 return 1;
492
493 complete((struct completion*)bio->bi_private);
494 return 0;
495}
496
a654b9d8 497int sync_page_io(struct block_device *bdev, sector_t sector, int size,
1da177e4
LT		 498 struct page *page, int rw)
499{
baaa2c51 500 struct bio *bio = bio_alloc(GFP_NOIO, 1);
1da177e4
LT		 501 struct completion event;
502 int ret;
503
504 rw |= (1 << BIO_RW_SYNC);
505
506 bio->bi_bdev = bdev;
507 bio->bi_sector = sector;
508 bio_add_page(bio, page, size, 0);
509 init_completion(&event);
510 bio->bi_private = &event;
511 bio->bi_end_io = bi_complete;
512 submit_bio(rw, bio);
513 wait_for_completion(&event);
514
515 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
516 bio_put(bio);
517 return ret;
518}
a8745db2 519EXPORT_SYMBOL_GPL(sync_page_io);
1da177e4 520
0002b271 521static int read_disk_sb(mdk_rdev_t * rdev, int size)
1da177e4
LT		 522{
523 char b[BDEVNAME_SIZE];
524 if (!rdev->sb_page) {
525 MD_BUG();
526 return -EINVAL;
527 }
528 if (rdev->sb_loaded)
529 return 0;
530
531
0002b271 532 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
1da177e4
LT		 533 goto fail;
534 rdev->sb_loaded = 1;
535 return 0;
536
537fail:
538 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
539 bdevname(rdev->bdev,b));
540 return -EINVAL;
541}
542
543static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
544{
545 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
546 (sb1->set_uuid1 == sb2->set_uuid1) &&
547 (sb1->set_uuid2 == sb2->set_uuid2) &&
548 (sb1->set_uuid3 == sb2->set_uuid3))
549
550 return 1;
551
552 return 0;
553}
554
555
556static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
557{
558 int ret;
559 mdp_super_t *tmp1, *tmp2;
560
561 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
562 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
563
564 if (!tmp1 || !tmp2) {
565 ret = 0;
566 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
567 goto abort;
568 }
569
570 *tmp1 = *sb1;
571 *tmp2 = *sb2;
572
573 /*
574 * nr_disks is not constant
575 */
576 tmp1->nr_disks = 0;
577 tmp2->nr_disks = 0;
578
579 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
580 ret = 0;
581 else
582 ret = 1;
583
584abort:
990a8baf
JJ		 585 kfree(tmp1);
586 kfree(tmp2);
1da177e4
LT		 587 return ret;
588}
589
590static unsigned int calc_sb_csum(mdp_super_t * sb)
591{
592 unsigned int disk_csum, csum;
593
594 disk_csum = sb->sb_csum;
595 sb->sb_csum = 0;
596 csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
597 sb->sb_csum = disk_csum;
598 return csum;
599}
600
601
602/*
603 * Handle superblock details.
604 * We want to be able to handle multiple superblock formats
605 * so we have a common interface to them all, and an array of
606 * different handlers.
607 * We rely on user-space to write the initial superblock, and support
608 * reading and updating of superblocks.
609 * Interface methods are:
610 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
611 * loads and validates a superblock on dev.
612 * if refdev != NULL, compare superblocks on both devices
613 * Return:
614 * 0 - dev has a superblock that is compatible with refdev
615 * 1 - dev has a superblock that is compatible and newer than refdev
616 * so dev should be used as the refdev in future
617 * -EINVAL superblock incompatible or invalid
618 * -othererror e.g. -EIO
619 *
620 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
621 * Verify that dev is acceptable into mddev.
622 * The first time, mddev->raid_disks will be 0, and data from
623 * dev should be merged in. Subsequent calls check that dev
624 * is new enough. Return 0 or -EINVAL
625 *
626 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
627 * Update the superblock for rdev with data in mddev
628 * This does not write to disc.
629 *
630 */
631
632struct super_type {
633 char *name;
634 struct module *owner;
635 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
636 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
637 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
638};
639
640/*
641 * load_super for 0.90.0
642 */
643static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
644{
645 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
646 mdp_super_t *sb;
647 int ret;
648 sector_t sb_offset;
649
650 /*
651 * Calculate the position of the superblock,
652 * it's at the end of the disk.
653 *
654 * It also happens to be a multiple of 4Kb.
655 */
656 sb_offset = calc_dev_sboffset(rdev->bdev);
657 rdev->sb_offset = sb_offset;
658
0002b271 659 ret = read_disk_sb(rdev, MD_SB_BYTES);
1da177e4
LT		 660 if (ret) return ret;
661
662 ret = -EINVAL;
663
664 bdevname(rdev->bdev, b);
665 sb = (mdp_super_t*)page_address(rdev->sb_page);
666
667 if (sb->md_magic != MD_SB_MAGIC) {
668 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
669 b);
670 goto abort;
671 }
672
673 if (sb->major_version != 0 ||
f6705578
N		 674 sb->minor_version < 90 ||
675 sb->minor_version > 91) {
1da177e4
LT		 676 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
677 sb->major_version, sb->minor_version,
678 b);
679 goto abort;
680 }
681
682 if (sb->raid_disks <= 0)
683 goto abort;
684
685 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
686 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
687 b);
688 goto abort;
689 }
690
691 rdev->preferred_minor = sb->md_minor;
692 rdev->data_offset = 0;
0002b271 693 rdev->sb_size = MD_SB_BYTES;
1da177e4
LT		 694
695 if (sb->level == LEVEL_MULTIPATH)
696 rdev->desc_nr = -1;
697 else
698 rdev->desc_nr = sb->this_disk.number;
699
700 if (refdev == 0)
701 ret = 1;
702 else {
703 __u64 ev1, ev2;
704 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
705 if (!uuid_equal(refsb, sb)) {
706 printk(KERN_WARNING "md: %s has different UUID to %s\n",
707 b, bdevname(refdev->bdev,b2));
708 goto abort;
709 }
710 if (!sb_equal(refsb, sb)) {
711 printk(KERN_WARNING "md: %s has same UUID"
712 " but different superblock to %s\n",
713 b, bdevname(refdev->bdev, b2));
714 goto abort;
715 }
716 ev1 = md_event(sb);
717 ev2 = md_event(refsb);
718 if (ev1 > ev2)
719 ret = 1;
720 else
721 ret = 0;
722 }
723 rdev->size = calc_dev_size(rdev, sb->chunk_size);
724
2bf071bf
N		 725 if (rdev->size < sb->size && sb->level > 1)
726 /* "this cannot possibly happen" ... */
727 ret = -EINVAL;
728
1da177e4
LT		 729 abort:
730 return ret;
731}
732
733/*
734 * validate_super for 0.90.0
735 */
736static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
737{
738 mdp_disk_t *desc;
739 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
07d84d10 740 __u64 ev1 = md_event(sb);
1da177e4 741
41158c7e 742 rdev->raid_disk = -1;
b2d444d7 743 rdev->flags = 0;
1da177e4
LT		 744 if (mddev->raid_disks == 0) {
745 mddev->major_version = 0;
746 mddev->minor_version = sb->minor_version;
747 mddev->patch_version = sb->patch_version;
748 mddev->persistent = ! sb->not_persistent;
749 mddev->chunk_size = sb->chunk_size;
750 mddev->ctime = sb->ctime;
751 mddev->utime = sb->utime;
752 mddev->level = sb->level;
d9d166c2 753 mddev->clevel[0] = 0;
1da177e4
LT		 754 mddev->layout = sb->layout;
755 mddev->raid_disks = sb->raid_disks;
756 mddev->size = sb->size;
07d84d10 757 mddev->events = ev1;
9223214e 758 mddev->bitmap_offset = 0;
36fa3063 759 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
1da177e4 760
f6705578
N		 761 if (mddev->minor_version >= 91) {
762 mddev->reshape_position = sb->reshape_position;
763 mddev->delta_disks = sb->delta_disks;
764 mddev->new_level = sb->new_level;
765 mddev->new_layout = sb->new_layout;
766 mddev->new_chunk = sb->new_chunk;
767 } else {
768 mddev->reshape_position = MaxSector;
769 mddev->delta_disks = 0;
770 mddev->new_level = mddev->level;
771 mddev->new_layout = mddev->layout;
772 mddev->new_chunk = mddev->chunk_size;
773 }
774
1da177e4
LT		 775 if (sb->state & (1<<MD_SB_CLEAN))
776 mddev->recovery_cp = MaxSector;
777 else {
778 if (sb->events_hi == sb->cp_events_hi &&
779 sb->events_lo == sb->cp_events_lo) {
780 mddev->recovery_cp = sb->recovery_cp;
781 } else
782 mddev->recovery_cp = 0;
783 }
784
785 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
786 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
787 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
788 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
789
790 mddev->max_disks = MD_SB_DISKS;
a654b9d8
N		 791
792 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
793 mddev->bitmap_file == NULL) {
c5a10f62
N		 794 if (mddev->level != 1 && mddev->level != 4
795 && mddev->level != 5 && mddev->level != 6
6cce3b23 796 && mddev->level != 10) {
a654b9d8 797 /* FIXME use a better test */
6cce3b23 798 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
a654b9d8
N		 799 return -EINVAL;
800 }
36fa3063 801 mddev->bitmap_offset = mddev->default_bitmap_offset;
a654b9d8
N		 802 }
803
41158c7e
N		 804 } else if (mddev->pers == NULL) {
805 /* Insist on good event counter while assembling */
1da177e4
LT		 806 ++ev1;
807 if (ev1 < mddev->events)
808 return -EINVAL;
41158c7e
N		 809 } else if (mddev->bitmap) {
810 /* if adding to array with a bitmap, then we can accept an
811 * older device ... but not too old.
812 */
41158c7e
N		 813 if (ev1 < mddev->bitmap->events_cleared)
814 return 0;
07d84d10
N		 815 } else {
816 if (ev1 < mddev->events)
817 /* just a hot-add of a new device, leave raid_disk at -1 */
818 return 0;
819 }
41158c7e 820
1da177e4 821 if (mddev->level != LEVEL_MULTIPATH) {
1da177e4
LT		 822 desc = sb->disks + rdev->desc_nr;
823
824 if (desc->state & (1<<MD_DISK_FAULTY))
b2d444d7 825 set_bit(Faulty, &rdev->flags);
7c7546cc
N		 826 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
827 desc->raid_disk < mddev->raid_disks */) {
b2d444d7 828 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 829 rdev->raid_disk = desc->raid_disk;
830 }
8ddf9efe
N		 831 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
832 set_bit(WriteMostly, &rdev->flags);
41158c7e 833 } else /* MULTIPATH are always insync */
b2d444d7 834 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 835 return 0;
836}
837
838/*
839 * sync_super for 0.90.0
840 */
841static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
842{
843 mdp_super_t *sb;
844 struct list_head *tmp;
845 mdk_rdev_t *rdev2;
846 int next_spare = mddev->raid_disks;
19133a42 847
1da177e4
LT		 848
849 /* make rdev->sb match mddev data..
850 *
851 * 1/ zero out disks
852 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
853 * 3/ any empty disks < next_spare become removed
854 *
855 * disks[0] gets initialised to REMOVED because
856 * we cannot be sure from other fields if it has
857 * been initialised or not.
858 */
859 int i;
860 int active=0, working=0,failed=0,spare=0,nr_disks=0;
861
61181565
N		 862 rdev->sb_size = MD_SB_BYTES;
863
1da177e4
LT		 864 sb = (mdp_super_t*)page_address(rdev->sb_page);
865
866 memset(sb, 0, sizeof(*sb));
867
868 sb->md_magic = MD_SB_MAGIC;
869 sb->major_version = mddev->major_version;
1da177e4
LT		 870 sb->patch_version = mddev->patch_version;
871 sb->gvalid_words = 0; /* ignored */
872 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
873 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
874 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
875 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
876
877 sb->ctime = mddev->ctime;
878 sb->level = mddev->level;
879 sb->size = mddev->size;
880 sb->raid_disks = mddev->raid_disks;
881 sb->md_minor = mddev->md_minor;
882 sb->not_persistent = !mddev->persistent;
883 sb->utime = mddev->utime;
884 sb->state = 0;
885 sb->events_hi = (mddev->events>>32);
886 sb->events_lo = (u32)mddev->events;
887
f6705578
N		 888 if (mddev->reshape_position == MaxSector)
889 sb->minor_version = 90;
890 else {
891 sb->minor_version = 91;
892 sb->reshape_position = mddev->reshape_position;
893 sb->new_level = mddev->new_level;
894 sb->delta_disks = mddev->delta_disks;
895 sb->new_layout = mddev->new_layout;
896 sb->new_chunk = mddev->new_chunk;
897 }
898 mddev->minor_version = sb->minor_version;
1da177e4
LT		 899 if (mddev->in_sync)
900 {
901 sb->recovery_cp = mddev->recovery_cp;
902 sb->cp_events_hi = (mddev->events>>32);
903 sb->cp_events_lo = (u32)mddev->events;
904 if (mddev->recovery_cp == MaxSector)
905 sb->state = (1<< MD_SB_CLEAN);
906 } else
907 sb->recovery_cp = 0;
908
909 sb->layout = mddev->layout;
910 sb->chunk_size = mddev->chunk_size;
911
a654b9d8
N		 912 if (mddev->bitmap && mddev->bitmap_file == NULL)
913 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
914
1da177e4
LT		 915 sb->disks[0].state = (1<<MD_DISK_REMOVED);
916 ITERATE_RDEV(mddev,rdev2,tmp) {
917 mdp_disk_t *d;
86e6ffdd 918 int desc_nr;
b2d444d7
N		 919 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
920 && !test_bit(Faulty, &rdev2->flags))
86e6ffdd 921 desc_nr = rdev2->raid_disk;
1da177e4 922 else
86e6ffdd 923 desc_nr = next_spare++;
19133a42 924 rdev2->desc_nr = desc_nr;
1da177e4
LT		 925 d = &sb->disks[rdev2->desc_nr];
926 nr_disks++;
927 d->number = rdev2->desc_nr;
928 d->major = MAJOR(rdev2->bdev->bd_dev);
929 d->minor = MINOR(rdev2->bdev->bd_dev);
b2d444d7
N		 930 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
931 && !test_bit(Faulty, &rdev2->flags))
1da177e4
LT		 932 d->raid_disk = rdev2->raid_disk;
933 else
934 d->raid_disk = rdev2->desc_nr; /* compatibility */
1be7892f 935 if (test_bit(Faulty, &rdev2->flags))
1da177e4 936 d->state = (1<<MD_DISK_FAULTY);
1be7892f 937 else if (test_bit(In_sync, &rdev2->flags)) {
1da177e4
LT		 938 d->state = (1<<MD_DISK_ACTIVE);
939 d->state |= (1<<MD_DISK_SYNC);
940 active++;
941 working++;
942 } else {
943 d->state = 0;
944 spare++;
945 working++;
946 }
8ddf9efe
N		 947 if (test_bit(WriteMostly, &rdev2->flags))
948 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4 949 }
1da177e4
LT		 950 /* now set the "removed" and "faulty" bits on any missing devices */
951 for (i=0 ; i < mddev->raid_disks ; i++) {
952 mdp_disk_t *d = &sb->disks[i];
953 if (d->state == 0 && d->number == 0) {
954 d->number = i;
955 d->raid_disk = i;
956 d->state = (1<<MD_DISK_REMOVED);
957 d->state |= (1<<MD_DISK_FAULTY);
958 failed++;
959 }
960 }
961 sb->nr_disks = nr_disks;
962 sb->active_disks = active;
963 sb->working_disks = working;
964 sb->failed_disks = failed;
965 sb->spare_disks = spare;
966
967 sb->this_disk = sb->disks[rdev->desc_nr];
968 sb->sb_csum = calc_sb_csum(sb);
969}
970
971/*
972 * version 1 superblock
973 */
974
975static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
976{
977 unsigned int disk_csum, csum;
978 unsigned long long newcsum;
979 int size = 256 + le32_to_cpu(sb->max_dev)*2;
980 unsigned int *isuper = (unsigned int*)sb;
981 int i;
982
983 disk_csum = sb->sb_csum;
984 sb->sb_csum = 0;
985 newcsum = 0;
986 for (i=0; size>=4; size -= 4 )
987 newcsum += le32_to_cpu(*isuper++);
988
989 if (size == 2)
990 newcsum += le16_to_cpu(*(unsigned short*) isuper);
991
992 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
993 sb->sb_csum = disk_csum;
994 return cpu_to_le32(csum);
995}
996
997static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
998{
999 struct mdp_superblock_1 *sb;
1000 int ret;
1001 sector_t sb_offset;
1002 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 1003 int bmask;
1da177e4
LT		 1004
1005 /*
1006 * Calculate the position of the superblock.
1007 * It is always aligned to a 4K boundary and
1008 * depeding on minor_version, it can be:
1009 * 0: At least 8K, but less than 12K, from end of device
1010 * 1: At start of device
1011 * 2: 4K from start of device.
1012 */
1013 switch(minor_version) {
1014 case 0:
1015 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1016 sb_offset -= 8*2;
39730960 1017 sb_offset &= ~(sector_t)(4*2-1);
1da177e4
LT		 1018 /* convert from sectors to K */
1019 sb_offset /= 2;
1020 break;
1021 case 1:
1022 sb_offset = 0;
1023 break;
1024 case 2:
1025 sb_offset = 4;
1026 break;
1027 default:
1028 return -EINVAL;
1029 }
1030 rdev->sb_offset = sb_offset;
1031
0002b271
N		 1032 /* superblock is rarely larger than 1K, but it can be larger,
1033 * and it is safe to read 4k, so we do that
1034 */
1035 ret = read_disk_sb(rdev, 4096);
1da177e4
LT		 1036 if (ret) return ret;
1037
1038
1039 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1040
1041 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1042 sb->major_version != cpu_to_le32(1) ||
1043 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1044 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
71c0805c 1045 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT		 1046 return -EINVAL;
1047
1048 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1049 printk("md: invalid superblock checksum on %s\n",
1050 bdevname(rdev->bdev,b));
1051 return -EINVAL;
1052 }
1053 if (le64_to_cpu(sb->data_size) < 10) {
1054 printk("md: data_size too small on %s\n",
1055 bdevname(rdev->bdev,b));
1056 return -EINVAL;
1057 }
1058 rdev->preferred_minor = 0xffff;
1059 rdev->data_offset = le64_to_cpu(sb->data_offset);
4dbcdc75 1060 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1da177e4 1061
0002b271 1062 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
720a3dc3 1063 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
0002b271
N		 1064 if (rdev->sb_size & bmask)
1065 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1066
1da177e4 1067 if (refdev == 0)
8ed75463 1068 ret = 1;
1da177e4
LT		 1069 else {
1070 __u64 ev1, ev2;
1071 struct mdp_superblock_1 *refsb =
1072 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1073
1074 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1075 sb->level != refsb->level ||
1076 sb->layout != refsb->layout ||
1077 sb->chunksize != refsb->chunksize) {
1078 printk(KERN_WARNING "md: %s has strangely different"
1079 " superblock to %s\n",
1080 bdevname(rdev->bdev,b),
1081 bdevname(refdev->bdev,b2));
1082 return -EINVAL;
1083 }
1084 ev1 = le64_to_cpu(sb->events);
1085 ev2 = le64_to_cpu(refsb->events);
1086
1087 if (ev1 > ev2)
8ed75463
N		 1088 ret = 1;
1089 else
1090 ret = 0;
1da177e4
LT		 1091 }
1092 if (minor_version)
1093 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1094 else
1095 rdev->size = rdev->sb_offset;
1096 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1097 return -EINVAL;
1098 rdev->size = le64_to_cpu(sb->data_size)/2;
1099 if (le32_to_cpu(sb->chunksize))
1100 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
2bf071bf
N		 1101
1102 if (le32_to_cpu(sb->size) > rdev->size*2)
1103 return -EINVAL;
8ed75463 1104 return ret;
1da177e4
LT		 1105}
1106
1107static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1108{
1109 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
07d84d10 1110 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4 1111
41158c7e 1112 rdev->raid_disk = -1;
b2d444d7 1113 rdev->flags = 0;
1da177e4
LT		 1114 if (mddev->raid_disks == 0) {
1115 mddev->major_version = 1;
1116 mddev->patch_version = 0;
1117 mddev->persistent = 1;
1118 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1119 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1120 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1121 mddev->level = le32_to_cpu(sb->level);
d9d166c2 1122 mddev->clevel[0] = 0;
1da177e4
LT		 1123 mddev->layout = le32_to_cpu(sb->layout);
1124 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1125 mddev->size = le64_to_cpu(sb->size)/2;
07d84d10 1126 mddev->events = ev1;
9223214e 1127 mddev->bitmap_offset = 0;
29fc7e3e 1128 mddev->default_bitmap_offset = 1024 >> 9;
1da177e4
LT		 1129
1130 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1131 memcpy(mddev->uuid, sb->set_uuid, 16);
1132
1133 mddev->max_disks = (4096-256)/2;
a654b9d8 1134
71c0805c 1135 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
a654b9d8 1136 mddev->bitmap_file == NULL ) {
6cce3b23
N		 1137 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
1138 && mddev->level != 10) {
1139 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
a654b9d8
N		 1140 return -EINVAL;
1141 }
1142 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1143 }
f6705578
N		 1144 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1145 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1146 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1147 mddev->new_level = le32_to_cpu(sb->new_level);
1148 mddev->new_layout = le32_to_cpu(sb->new_layout);
1149 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1150 } else {
1151 mddev->reshape_position = MaxSector;
1152 mddev->delta_disks = 0;
1153 mddev->new_level = mddev->level;
1154 mddev->new_layout = mddev->layout;
1155 mddev->new_chunk = mddev->chunk_size;
1156 }
1157
41158c7e
N		 1158 } else if (mddev->pers == NULL) {
1159 /* Insist of good event counter while assembling */
1da177e4
LT		 1160 ++ev1;
1161 if (ev1 < mddev->events)
1162 return -EINVAL;
41158c7e
N		 1163 } else if (mddev->bitmap) {
1164 /* If adding to array with a bitmap, then we can accept an
1165 * older device, but not too old.
1166 */
41158c7e
N		 1167 if (ev1 < mddev->bitmap->events_cleared)
1168 return 0;
07d84d10
N		 1169 } else {
1170 if (ev1 < mddev->events)
1171 /* just a hot-add of a new device, leave raid_disk at -1 */
1172 return 0;
1173 }
1da177e4
LT		 1174 if (mddev->level != LEVEL_MULTIPATH) {
1175 int role;
1176 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1177 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1178 switch(role) {
1179 case 0xffff: /* spare */
1da177e4
LT		 1180 break;
1181 case 0xfffe: /* faulty */
b2d444d7 1182 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 1183 break;
1184 default:
5fd6c1dc
N		 1185 if ((le32_to_cpu(sb->feature_map) &
1186 MD_FEATURE_RECOVERY_OFFSET))
1187 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1188 else
1189 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1190 rdev->raid_disk = role;
1191 break;
1192 }
8ddf9efe
N		 1193 if (sb->devflags & WriteMostly1)
1194 set_bit(WriteMostly, &rdev->flags);
41158c7e 1195 } else /* MULTIPATH are always insync */
b2d444d7 1196 set_bit(In_sync, &rdev->flags);
41158c7e 1197
1da177e4
LT		 1198 return 0;
1199}
1200
1201static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1202{
1203 struct mdp_superblock_1 *sb;
1204 struct list_head *tmp;
1205 mdk_rdev_t *rdev2;
1206 int max_dev, i;
1207 /* make rdev->sb match mddev and rdev data. */
1208
1209 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1210
1211 sb->feature_map = 0;
1212 sb->pad0 = 0;
5fd6c1dc 1213 sb->recovery_offset = cpu_to_le64(0);
1da177e4
LT		 1214 memset(sb->pad1, 0, sizeof(sb->pad1));
1215 memset(sb->pad2, 0, sizeof(sb->pad2));
1216 memset(sb->pad3, 0, sizeof(sb->pad3));
1217
1218 sb->utime = cpu_to_le64((__u64)mddev->utime);
1219 sb->events = cpu_to_le64(mddev->events);
1220 if (mddev->in_sync)
1221 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1222 else
1223 sb->resync_offset = cpu_to_le64(0);
1224
4dbcdc75
N		 1225 sb->cnt_corrected_read = atomic_read(&rdev->corrected_errors);
1226
f0ca340c 1227 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
29fc7e3e 1228 sb->size = cpu_to_le64(mddev->size<<1);
f0ca340c 1229
a654b9d8
N		 1230 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1231 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
71c0805c 1232 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8 1233 }
5fd6c1dc
N		 1234
1235 if (rdev->raid_disk >= 0 &&
1236 !test_bit(In_sync, &rdev->flags) &&
1237 rdev->recovery_offset > 0) {
1238 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1239 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1240 }
1241
f6705578
N		 1242 if (mddev->reshape_position != MaxSector) {
1243 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1244 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1245 sb->new_layout = cpu_to_le32(mddev->new_layout);
1246 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1247 sb->new_level = cpu_to_le32(mddev->new_level);
1248 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1249 }
a654b9d8 1250
1da177e4
LT		 1251 max_dev = 0;
1252 ITERATE_RDEV(mddev,rdev2,tmp)
1253 if (rdev2->desc_nr+1 > max_dev)
1254 max_dev = rdev2->desc_nr+1;
1255
1256 sb->max_dev = cpu_to_le32(max_dev);
1257 for (i=0; i<max_dev;i++)
1258 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1259
1260 ITERATE_RDEV(mddev,rdev2,tmp) {
1261 i = rdev2->desc_nr;
b2d444d7 1262 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1263 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1264 else if (test_bit(In_sync, &rdev2->flags))
1da177e4 1265 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
5fd6c1dc
N		 1266 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1267 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1da177e4
LT		 1268 else
1269 sb->dev_roles[i] = cpu_to_le16(0xffff);
1270 }
1271
1da177e4
LT		 1272 sb->sb_csum = calc_sb_1_csum(sb);
1273}
1274
1275
75c96f85 1276static struct super_type super_types[] = {
1da177e4
LT		 1277 [0] = {
1278 .name = "0.90.0",
1279 .owner = THIS_MODULE,
1280 .load_super = super_90_load,
1281 .validate_super = super_90_validate,
1282 .sync_super = super_90_sync,
1283 },
1284 [1] = {
1285 .name = "md-1",
1286 .owner = THIS_MODULE,
1287 .load_super = super_1_load,
1288 .validate_super = super_1_validate,
1289 .sync_super = super_1_sync,
1290 },
1291};
1292
1293static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1294{
1295 struct list_head *tmp;
1296 mdk_rdev_t *rdev;
1297
1298 ITERATE_RDEV(mddev,rdev,tmp)
1299 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1300 return rdev;
1301
1302 return NULL;
1303}
1304
1305static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1306{
1307 struct list_head *tmp;
1308 mdk_rdev_t *rdev;
1309
1310 ITERATE_RDEV(mddev1,rdev,tmp)
1311 if (match_dev_unit(mddev2, rdev))
1312 return 1;
1313
1314 return 0;
1315}
1316
1317static LIST_HEAD(pending_raid_disks);
1318
1319static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1320{
1321 mdk_rdev_t *same_pdev;
1322 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
f637b9f9 1323 struct kobject *ko;
1edf80d3 1324 char *s;
1da177e4
LT		 1325
1326 if (rdev->mddev) {
1327 MD_BUG();
1328 return -EINVAL;
1329 }
2bf071bf
N		 1330 /* make sure rdev->size exceeds mddev->size */
1331 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1332 if (mddev->pers)
1333 /* Cannot change size, so fail */
1334 return -ENOSPC;
1335 else
1336 mddev->size = rdev->size;
1337 }
1da177e4
LT		 1338 same_pdev = match_dev_unit(mddev, rdev);
1339 if (same_pdev)
1340 printk(KERN_WARNING
1341 "%s: WARNING: %s appears to be on the same physical"
1342 " disk as %s. True\n protection against single-disk"
1343 " failure might be compromised.\n",
1344 mdname(mddev), bdevname(rdev->bdev,b),
1345 bdevname(same_pdev->bdev,b2));
1346
1347 /* Verify rdev->desc_nr is unique.
1348 * If it is -1, assign a free number, else
1349 * check number is not in use
1350 */
1351 if (rdev->desc_nr < 0) {
1352 int choice = 0;
1353 if (mddev->pers) choice = mddev->raid_disks;
1354 while (find_rdev_nr(mddev, choice))
1355 choice++;
1356 rdev->desc_nr = choice;
1357 } else {
1358 if (find_rdev_nr(mddev, rdev->desc_nr))
1359 return -EBUSY;
1360 }
19133a42
N		 1361 bdevname(rdev->bdev,b);
1362 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1363 return -ENOMEM;
1edf80d3
NB		 1364 while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
1365 *s = '!';
1da177e4
LT		 1366
1367 list_add(&rdev->same_set, &mddev->disks);
1368 rdev->mddev = mddev;
19133a42 1369 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 1370
9c791977 1371 rdev->kobj.parent = &mddev->kobj;
86e6ffdd
N		 1372 kobject_add(&rdev->kobj);
1373
f637b9f9
N		 1374 if (rdev->bdev->bd_part)
1375 ko = &rdev->bdev->bd_part->kobj;
1376 else
1377 ko = &rdev->bdev->bd_disk->kobj;
1378 sysfs_create_link(&rdev->kobj, ko, "block");
5463c790 1379 bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
1da177e4
LT		 1380 return 0;
1381}
1382
1383static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1384{
1385 char b[BDEVNAME_SIZE];
1386 if (!rdev->mddev) {
1387 MD_BUG();
1388 return;
1389 }
5463c790 1390 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1da177e4
LT		 1391 list_del_init(&rdev->same_set);
1392 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1393 rdev->mddev = NULL;
86e6ffdd
N		 1394 sysfs_remove_link(&rdev->kobj, "block");
1395 kobject_del(&rdev->kobj);
1da177e4
LT		 1396}
1397
1398/*
1399 * prevent the device from being mounted, repartitioned or
1400 * otherwise reused by a RAID array (or any other kernel
1401 * subsystem), by bd_claiming the device.
1402 */
1403static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1404{
1405 int err = 0;
1406 struct block_device *bdev;
1407 char b[BDEVNAME_SIZE];
1408
1409 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1410 if (IS_ERR(bdev)) {
1411 printk(KERN_ERR "md: could not open %s.\n",
1412 __bdevname(dev, b));
1413 return PTR_ERR(bdev);
1414 }
1415 err = bd_claim(bdev, rdev);
1416 if (err) {
1417 printk(KERN_ERR "md: could not bd_claim %s.\n",
1418 bdevname(bdev, b));
1419 blkdev_put(bdev);
1420 return err;
1421 }
1422 rdev->bdev = bdev;
1423 return err;
1424}
1425
1426static void unlock_rdev(mdk_rdev_t *rdev)
1427{
1428 struct block_device *bdev = rdev->bdev;
1429 rdev->bdev = NULL;
1430 if (!bdev)
1431 MD_BUG();
1432 bd_release(bdev);
1433 blkdev_put(bdev);
1434}
1435
1436void md_autodetect_dev(dev_t dev);
1437
1438static void export_rdev(mdk_rdev_t * rdev)
1439{
1440 char b[BDEVNAME_SIZE];
1441 printk(KERN_INFO "md: export_rdev(%s)\n",
1442 bdevname(rdev->bdev,b));
1443 if (rdev->mddev)
1444 MD_BUG();
1445 free_disk_sb(rdev);
1446 list_del_init(&rdev->same_set);
1447#ifndef MODULE
1448 md_autodetect_dev(rdev->bdev->bd_dev);
1449#endif
1450 unlock_rdev(rdev);
86e6ffdd 1451 kobject_put(&rdev->kobj);
1da177e4
LT		 1452}
1453
1454static void kick_rdev_from_array(mdk_rdev_t * rdev)
1455{
1456 unbind_rdev_from_array(rdev);
1457 export_rdev(rdev);
1458}
1459
1460static void export_array(mddev_t *mddev)
1461{
1462 struct list_head *tmp;
1463 mdk_rdev_t *rdev;
1464
1465 ITERATE_RDEV(mddev,rdev,tmp) {
1466 if (!rdev->mddev) {
1467 MD_BUG();
1468 continue;
1469 }
1470 kick_rdev_from_array(rdev);
1471 }
1472 if (!list_empty(&mddev->disks))
1473 MD_BUG();
1474 mddev->raid_disks = 0;
1475 mddev->major_version = 0;
1476}
1477
1478static void print_desc(mdp_disk_t *desc)
1479{
1480 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1481 desc->major,desc->minor,desc->raid_disk,desc->state);
1482}
1483
1484static void print_sb(mdp_super_t *sb)
1485{
1486 int i;
1487
1488 printk(KERN_INFO
1489 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1490 sb->major_version, sb->minor_version, sb->patch_version,
1491 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1492 sb->ctime);
1493 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1494 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1495 sb->md_minor, sb->layout, sb->chunk_size);
1496 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1497 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1498 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1499 sb->failed_disks, sb->spare_disks,
1500 sb->sb_csum, (unsigned long)sb->events_lo);
1501
1502 printk(KERN_INFO);
1503 for (i = 0; i < MD_SB_DISKS; i++) {
1504 mdp_disk_t *desc;
1505
1506 desc = sb->disks + i;
1507 if (desc->number || desc->major || desc->minor ||
1508 desc->raid_disk || (desc->state && (desc->state != 4))) {
1509 printk(" D %2d: ", i);
1510 print_desc(desc);
1511 }
1512 }
1513 printk(KERN_INFO "md: THIS: ");
1514 print_desc(&sb->this_disk);
1515
1516}
1517
1518static void print_rdev(mdk_rdev_t *rdev)
1519{
1520 char b[BDEVNAME_SIZE];
1521 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1522 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
b2d444d7
N		 1523 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1524 rdev->desc_nr);
1da177e4
LT		 1525 if (rdev->sb_loaded) {
1526 printk(KERN_INFO "md: rdev superblock:\n");
1527 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1528 } else
1529 printk(KERN_INFO "md: no rdev superblock!\n");
1530}
1531
5e56341d 1532static void md_print_devices(void)
1da177e4
LT		 1533{
1534 struct list_head *tmp, *tmp2;
1535 mdk_rdev_t *rdev;
1536 mddev_t *mddev;
1537 char b[BDEVNAME_SIZE];
1538
1539 printk("\n");
1540 printk("md: **********************************\n");
1541 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1542 printk("md: **********************************\n");
1543 ITERATE_MDDEV(mddev,tmp) {
1da177e4 1544
32a7627c
N		 1545 if (mddev->bitmap)
1546 bitmap_print_sb(mddev->bitmap);
1547 else
1548 printk("%s: ", mdname(mddev));
1da177e4
LT		 1549 ITERATE_RDEV(mddev,rdev,tmp2)
1550 printk("<%s>", bdevname(rdev->bdev,b));
1551 printk("\n");
1552
1553 ITERATE_RDEV(mddev,rdev,tmp2)
1554 print_rdev(rdev);
1555 }
1556 printk("md: **********************************\n");
1557 printk("\n");
1558}
1559
1560
42543769 1561static void sync_sbs(mddev_t * mddev, int nospares)
1da177e4 1562{
42543769
N		 1563 /* Update each superblock (in-memory image), but
1564 * if we are allowed to, skip spares which already
1565 * have the right event counter, or have one earlier
1566 * (which would mean they aren't being marked as dirty
1567 * with the rest of the array)
1568 */
1da177e4
LT		 1569 mdk_rdev_t *rdev;
1570 struct list_head *tmp;
1571
1572 ITERATE_RDEV(mddev,rdev,tmp) {
42543769
N		 1573 if (rdev->sb_events == mddev->events ||
1574 (nospares &&
1575 rdev->raid_disk < 0 &&
1576 (rdev->sb_events&1)==0 &&
1577 rdev->sb_events+1 == mddev->events)) {
1578 /* Don't update this superblock */
1579 rdev->sb_loaded = 2;
1580 } else {
1581 super_types[mddev->major_version].
1582 sync_super(mddev, rdev);
1583 rdev->sb_loaded = 1;
1584 }
1da177e4
LT		 1585 }
1586}
1587
f6705578 1588void md_update_sb(mddev_t * mddev)
1da177e4 1589{
7bfa19f2 1590 int err;
1da177e4
LT		 1591 struct list_head *tmp;
1592 mdk_rdev_t *rdev;
06d91a5f 1593 int sync_req;
42543769 1594 int nospares = 0;
1da177e4 1595
1da177e4 1596repeat:
a9701a30 1597 spin_lock_irq(&mddev->write_lock);
06d91a5f 1598 sync_req = mddev->in_sync;
1da177e4 1599 mddev->utime = get_seconds();
42543769
N		 1600 if (mddev->sb_dirty == 3)
1601 /* just a clean<-> dirty transition, possibly leave spares alone,
1602 * though if events isn't the right even/odd, we will have to do
1603 * spares after all
1604 */
1605 nospares = 1;
1606
1607 /* If this is just a dirty<->clean transition, and the array is clean
1608 * and 'events' is odd, we can roll back to the previous clean state */
1609 if (mddev->sb_dirty == 3
1610 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1611 && (mddev->events & 1))
1612 mddev->events--;
1613 else {
1614 /* otherwise we have to go forward and ... */
1615 mddev->events ++;
1616 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1617 /* .. if the array isn't clean, insist on an odd 'events' */
1618 if ((mddev->events&1)==0) {
1619 mddev->events++;
1620 nospares = 0;
1621 }
1622 } else {
1623 /* otherwise insist on an even 'events' (for clean states) */
1624 if ((mddev->events&1)) {
1625 mddev->events++;
1626 nospares = 0;
1627 }
1628 }
1629 }
1da177e4
LT		 1630
1631 if (!mddev->events) {
1632 /*
1633 * oops, this 64-bit counter should never wrap.
1634 * Either we are in around ~1 trillion A.C., assuming
1635 * 1 reboot per second, or we have a bug:
1636 */
1637 MD_BUG();
1638 mddev->events --;
1639 }
7bfa19f2 1640 mddev->sb_dirty = 2;
42543769 1641 sync_sbs(mddev, nospares);
1da177e4
LT		 1642
1643 /*
1644 * do not write anything to disk if using
1645 * nonpersistent superblocks
1646 */
06d91a5f
N		 1647 if (!mddev->persistent) {
1648 mddev->sb_dirty = 0;
a9701a30 1649 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1650 wake_up(&mddev->sb_wait);
1da177e4 1651 return;
06d91a5f 1652 }
a9701a30 1653 spin_unlock_irq(&mddev->write_lock);
1da177e4
LT		 1654
1655 dprintk(KERN_INFO
1656 "md: updating %s RAID superblock on device (in sync %d)\n",
1657 mdname(mddev),mddev->in_sync);
1658
32a7627c 1659 err = bitmap_update_sb(mddev->bitmap);
1da177e4
LT		 1660 ITERATE_RDEV(mddev,rdev,tmp) {
1661 char b[BDEVNAME_SIZE];
1662 dprintk(KERN_INFO "md: ");
42543769
N		 1663 if (rdev->sb_loaded != 1)
1664 continue; /* no noise on spare devices */
b2d444d7 1665 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1666 dprintk("(skipping faulty ");
1667
1668 dprintk("%s ", bdevname(rdev->bdev,b));
b2d444d7 1669 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 1670 md_super_write(mddev,rdev,
0002b271 1671 rdev->sb_offset<<1, rdev->sb_size,
7bfa19f2
N		 1672 rdev->sb_page);
1673 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1674 bdevname(rdev->bdev,b),
1675 (unsigned long long)rdev->sb_offset);
42543769 1676 rdev->sb_events = mddev->events;
7bfa19f2 1677
1da177e4
LT		 1678 } else
1679 dprintk(")\n");
7bfa19f2 1680 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT		 1681 /* only need to write one superblock... */
1682 break;
1683 }
a9701a30 1684 md_super_wait(mddev);
7bfa19f2
N		 1685 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1686
a9701a30 1687 spin_lock_irq(&mddev->write_lock);
7bfa19f2 1688 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
06d91a5f 1689 /* have to write it out again */
a9701a30 1690 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N		 1691 goto repeat;
1692 }
1693 mddev->sb_dirty = 0;
a9701a30 1694 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1695 wake_up(&mddev->sb_wait);
06d91a5f 1696
1da177e4 1697}
f6705578 1698EXPORT_SYMBOL_GPL(md_update_sb);
1da177e4 1699
bce74dac
N		 1700/* words written to sysfs files may, or my not, be \n terminated.
1701 * We want to accept with case. For this we use cmd_match.
1702 */
1703static int cmd_match(const char *cmd, const char *str)
1704{
1705 /* See if cmd, written into a sysfs file, matches
1706 * str. They must either be the same, or cmd can
1707 * have a trailing newline
1708 */
1709 while (*cmd && *str && *cmd == *str) {
1710 cmd++;
1711 str++;
1712 }
1713 if (*cmd == '\n')
1714 cmd++;
1715 if (*str || *cmd)
1716 return 0;
1717 return 1;
1718}
1719
86e6ffdd
N		 1720struct rdev_sysfs_entry {
1721 struct attribute attr;
1722 ssize_t (*show)(mdk_rdev_t *, char *);
1723 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1724};
1725
1726static ssize_t
96de1e66 1727state_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1728{
1729 char *sep = "";
1730 int len=0;
1731
b2d444d7 1732 if (test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 1733 len+= sprintf(page+len, "%sfaulty",sep);
1734 sep = ",";
1735 }
b2d444d7 1736 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1737 len += sprintf(page+len, "%sin_sync",sep);
1738 sep = ",";
1739 }
b2d444d7
N		 1740 if (!test_bit(Faulty, &rdev->flags) &&
1741 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1742 len += sprintf(page+len, "%sspare", sep);
1743 sep = ",";
1744 }
1745 return len+sprintf(page+len, "\n");
1746}
1747
45dc2de1
N		 1748static ssize_t
1749state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1750{
1751 /* can write
1752 * faulty - simulates and error
1753 * remove - disconnects the device
1754 */
1755 int err = -EINVAL;
1756 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1757 md_error(rdev->mddev, rdev);
1758 err = 0;
1759 } else if (cmd_match(buf, "remove")) {
1760 if (rdev->raid_disk >= 0)
1761 err = -EBUSY;
1762 else {
1763 mddev_t *mddev = rdev->mddev;
1764 kick_rdev_from_array(rdev);
1765 md_update_sb(mddev);
1766 md_new_event(mddev);
1767 err = 0;
1768 }
1769 }
1770 return err ? err : len;
1771}
96de1e66 1772static struct rdev_sysfs_entry
45dc2de1 1773rdev_state = __ATTR(state, 0644, state_show, state_store);
86e6ffdd
N		 1774
1775static ssize_t
96de1e66 1776super_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1777{
1778 if (rdev->sb_loaded && rdev->sb_size) {
1779 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1780 return rdev->sb_size;
1781 } else
1782 return 0;
1783}
96de1e66
N		 1784static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1785
4dbcdc75
N		 1786static ssize_t
1787errors_show(mdk_rdev_t *rdev, char *page)
1788{
1789 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1790}
1791
1792static ssize_t
1793errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1794{
1795 char *e;
1796 unsigned long n = simple_strtoul(buf, &e, 10);
1797 if (*buf && (*e == 0 || *e == '\n')) {
1798 atomic_set(&rdev->corrected_errors, n);
1799 return len;
1800 }
1801 return -EINVAL;
1802}
1803static struct rdev_sysfs_entry rdev_errors =
1804__ATTR(errors, 0644, errors_show, errors_store);
1805
014236d2
N		 1806static ssize_t
1807slot_show(mdk_rdev_t *rdev, char *page)
1808{
1809 if (rdev->raid_disk < 0)
1810 return sprintf(page, "none\n");
1811 else
1812 return sprintf(page, "%d\n", rdev->raid_disk);
1813}
1814
1815static ssize_t
1816slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1817{
1818 char *e;
1819 int slot = simple_strtoul(buf, &e, 10);
1820 if (strncmp(buf, "none", 4)==0)
1821 slot = -1;
1822 else if (e==buf || (*e && *e!= '\n'))
1823 return -EINVAL;
1824 if (rdev->mddev->pers)
1825 /* Cannot set slot in active array (yet) */
1826 return -EBUSY;
1827 if (slot >= rdev->mddev->raid_disks)
1828 return -ENOSPC;
1829 rdev->raid_disk = slot;
1830 /* assume it is working */
1831 rdev->flags = 0;
1832 set_bit(In_sync, &rdev->flags);
1833 return len;
1834}
1835
1836
1837static struct rdev_sysfs_entry rdev_slot =
1838__ATTR(slot, 0644, slot_show, slot_store);
1839
93c8cad0
N		 1840static ssize_t
1841offset_show(mdk_rdev_t *rdev, char *page)
1842{
6961ece4 1843 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
93c8cad0
N		 1844}
1845
1846static ssize_t
1847offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1848{
1849 char *e;
1850 unsigned long long offset = simple_strtoull(buf, &e, 10);
1851 if (e==buf || (*e && *e != '\n'))
1852 return -EINVAL;
1853 if (rdev->mddev->pers)
1854 return -EBUSY;
1855 rdev->data_offset = offset;
1856 return len;
1857}
1858
1859static struct rdev_sysfs_entry rdev_offset =
1860__ATTR(offset, 0644, offset_show, offset_store);
1861
83303b61
N		 1862static ssize_t
1863rdev_size_show(mdk_rdev_t *rdev, char *page)
1864{
1865 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1866}
1867
1868static ssize_t
1869rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1870{
1871 char *e;
1872 unsigned long long size = simple_strtoull(buf, &e, 10);
1873 if (e==buf || (*e && *e != '\n'))
1874 return -EINVAL;
1875 if (rdev->mddev->pers)
1876 return -EBUSY;
1877 rdev->size = size;
1878 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1879 rdev->mddev->size = size;
1880 return len;
1881}
1882
1883static struct rdev_sysfs_entry rdev_size =
1884__ATTR(size, 0644, rdev_size_show, rdev_size_store);
1885
86e6ffdd
N		 1886static struct attribute *rdev_default_attrs[] = {
1887 &rdev_state.attr,
1888 &rdev_super.attr,
4dbcdc75 1889 &rdev_errors.attr,
014236d2 1890 &rdev_slot.attr,
93c8cad0 1891 &rdev_offset.attr,
83303b61 1892 &rdev_size.attr,
86e6ffdd
N		 1893 NULL,
1894};
1895static ssize_t
1896rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1897{
1898 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1899 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1900
1901 if (!entry->show)
1902 return -EIO;
1903 return entry->show(rdev, page);
1904}
1905
1906static ssize_t
1907rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1908 const char *page, size_t length)
1909{
1910 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1911 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1912
1913 if (!entry->store)
1914 return -EIO;
1915 return entry->store(rdev, page, length);
1916}
1917
1918static void rdev_free(struct kobject *ko)
1919{
1920 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1921 kfree(rdev);
1922}
1923static struct sysfs_ops rdev_sysfs_ops = {
1924 .show = rdev_attr_show,
1925 .store = rdev_attr_store,
1926};
1927static struct kobj_type rdev_ktype = {
1928 .release = rdev_free,
1929 .sysfs_ops = &rdev_sysfs_ops,
1930 .default_attrs = rdev_default_attrs,
1931};
1932
1da177e4
LT		 1933/*
1934 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1935 *
1936 * mark the device faulty if:
1937 *
1938 * - the device is nonexistent (zero size)
1939 * - the device has no valid superblock
1940 *
1941 * a faulty rdev _never_ has rdev->sb set.
1942 */
1943static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1944{
1945 char b[BDEVNAME_SIZE];
1946 int err;
1947 mdk_rdev_t *rdev;
1948 sector_t size;
1949
9ffae0cf 1950 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1da177e4
LT		 1951 if (!rdev) {
1952 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1953 return ERR_PTR(-ENOMEM);
1954 }
1da177e4
LT		 1955
1956 if ((err = alloc_disk_sb(rdev)))
1957 goto abort_free;
1958
1959 err = lock_rdev(rdev, newdev);
1960 if (err)
1961 goto abort_free;
1962
86e6ffdd
N		 1963 rdev->kobj.parent = NULL;
1964 rdev->kobj.ktype = &rdev_ktype;
1965 kobject_init(&rdev->kobj);
1966
1da177e4 1967 rdev->desc_nr = -1;
b2d444d7 1968 rdev->flags = 0;
1da177e4 1969 rdev->data_offset = 0;
42543769 1970 rdev->sb_events = 0;
1da177e4 1971 atomic_set(&rdev->nr_pending, 0);
ba22dcbf 1972 atomic_set(&rdev->read_errors, 0);
4dbcdc75 1973 atomic_set(&rdev->corrected_errors, 0);
1da177e4
LT		 1974
1975 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
1976 if (!size) {
1977 printk(KERN_WARNING
1978 "md: %s has zero or unknown size, marking faulty!\n",
1979 bdevname(rdev->bdev,b));
1980 err = -EINVAL;
1981 goto abort_free;
1982 }
1983
1984 if (super_format >= 0) {
1985 err = super_types[super_format].
1986 load_super(rdev, NULL, super_minor);
1987 if (err == -EINVAL) {
1988 printk(KERN_WARNING
1989 "md: %s has invalid sb, not importing!\n",
1990 bdevname(rdev->bdev,b));
1991 goto abort_free;
1992 }
1993 if (err < 0) {
1994 printk(KERN_WARNING
1995 "md: could not read %s's sb, not importing!\n",
1996 bdevname(rdev->bdev,b));
1997 goto abort_free;
1998 }
1999 }
2000 INIT_LIST_HEAD(&rdev->same_set);
2001
2002 return rdev;
2003
2004abort_free:
2005 if (rdev->sb_page) {
2006 if (rdev->bdev)
2007 unlock_rdev(rdev);
2008 free_disk_sb(rdev);
2009 }
2010 kfree(rdev);
2011 return ERR_PTR(err);
2012}
2013
2014/*
2015 * Check a full RAID array for plausibility
2016 */
2017
2018
a757e64c 2019static void analyze_sbs(mddev_t * mddev)
1da177e4
LT		 2020{
2021 int i;
2022 struct list_head *tmp;
2023 mdk_rdev_t *rdev, *freshest;
2024 char b[BDEVNAME_SIZE];
2025
2026 freshest = NULL;
2027 ITERATE_RDEV(mddev,rdev,tmp)
2028 switch (super_types[mddev->major_version].
2029 load_super(rdev, freshest, mddev->minor_version)) {
2030 case 1:
2031 freshest = rdev;
2032 break;
2033 case 0:
2034 break;
2035 default:
2036 printk( KERN_ERR \
2037 "md: fatal superblock inconsistency in %s"
2038 " -- removing from array\n",
2039 bdevname(rdev->bdev,b));
2040 kick_rdev_from_array(rdev);
2041 }
2042
2043
2044 super_types[mddev->major_version].
2045 validate_super(mddev, freshest);
2046
2047 i = 0;
2048 ITERATE_RDEV(mddev,rdev,tmp) {
2049 if (rdev != freshest)
2050 if (super_types[mddev->major_version].
2051 validate_super(mddev, rdev)) {
2052 printk(KERN_WARNING "md: kicking non-fresh %s"
2053 " from array!\n",
2054 bdevname(rdev->bdev,b));
2055 kick_rdev_from_array(rdev);
2056 continue;
2057 }
2058 if (mddev->level == LEVEL_MULTIPATH) {
2059 rdev->desc_nr = i++;
2060 rdev->raid_disk = rdev->desc_nr;
b2d444d7 2061 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 2062 }
2063 }
2064
2065
2066
2067 if (mddev->recovery_cp != MaxSector &&
2068 mddev->level >= 1)
2069 printk(KERN_ERR "md: %s: raid array is not clean"
2070 " -- starting background reconstruction\n",
2071 mdname(mddev));
2072
1da177e4
LT		 2073}
2074
16f17b39
N		 2075static ssize_t
2076safe_delay_show(mddev_t *mddev, char *page)
2077{
2078 int msec = (mddev->safemode_delay*1000)/HZ;
2079 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2080}
2081static ssize_t
2082safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2083{
2084 int scale=1;
2085 int dot=0;
2086 int i;
2087 unsigned long msec;
2088 char buf[30];
2089 char *e;
2090 /* remove a period, and count digits after it */
2091 if (len >= sizeof(buf))
2092 return -EINVAL;
2093 strlcpy(buf, cbuf, len);
2094 buf[len] = 0;
2095 for (i=0; i<len; i++) {
2096 if (dot) {
2097 if (isdigit(buf[i])) {
2098 buf[i-1] = buf[i];
2099 scale *= 10;
2100 }
2101 buf[i] = 0;
2102 } else if (buf[i] == '.') {
2103 dot=1;
2104 buf[i] = 0;
2105 }
2106 }
2107 msec = simple_strtoul(buf, &e, 10);
2108 if (e == buf || (*e && *e != '\n'))
2109 return -EINVAL;
2110 msec = (msec * 1000) / scale;
2111 if (msec == 0)
2112 mddev->safemode_delay = 0;
2113 else {
2114 mddev->safemode_delay = (msec*HZ)/1000;
2115 if (mddev->safemode_delay == 0)
2116 mddev->safemode_delay = 1;
2117 }
2118 return len;
2119}
2120static struct md_sysfs_entry md_safe_delay =
2121__ATTR(safe_mode_delay, 0644,safe_delay_show, safe_delay_store);
2122
eae1701f 2123static ssize_t
96de1e66 2124level_show(mddev_t *mddev, char *page)
eae1701f 2125{
2604b703 2126 struct mdk_personality *p = mddev->pers;
d9d166c2 2127 if (p)
eae1701f 2128 return sprintf(page, "%s\n", p->name);
d9d166c2
N		 2129 else if (mddev->clevel[0])
2130 return sprintf(page, "%s\n", mddev->clevel);
2131 else if (mddev->level != LEVEL_NONE)
2132 return sprintf(page, "%d\n", mddev->level);
2133 else
2134 return 0;
eae1701f
N		 2135}
2136
d9d166c2
N		 2137static ssize_t
2138level_store(mddev_t *mddev, const char *buf, size_t len)
2139{
2140 int rv = len;
2141 if (mddev->pers)
2142 return -EBUSY;
2143 if (len == 0)
2144 return 0;
2145 if (len >= sizeof(mddev->clevel))
2146 return -ENOSPC;
2147 strncpy(mddev->clevel, buf, len);
2148 if (mddev->clevel[len-1] == '\n')
2149 len--;
2150 mddev->clevel[len] = 0;
2151 mddev->level = LEVEL_NONE;
2152 return rv;
2153}
2154
2155static struct md_sysfs_entry md_level =
2156__ATTR(level, 0644, level_show, level_store);
eae1701f 2157
d4dbd025
N		 2158
2159static ssize_t
2160layout_show(mddev_t *mddev, char *page)
2161{
2162 /* just a number, not meaningful for all levels */
2163 return sprintf(page, "%d\n", mddev->layout);
2164}
2165
2166static ssize_t
2167layout_store(mddev_t *mddev, const char *buf, size_t len)
2168{
2169 char *e;
2170 unsigned long n = simple_strtoul(buf, &e, 10);
2171 if (mddev->pers)
2172 return -EBUSY;
2173
2174 if (!*buf || (*e && *e != '\n'))
2175 return -EINVAL;
2176
2177 mddev->layout = n;
2178 return len;
2179}
2180static struct md_sysfs_entry md_layout =
2181__ATTR(layout, 0655, layout_show, layout_store);
2182
2183
eae1701f 2184static ssize_t
96de1e66 2185raid_disks_show(mddev_t *mddev, char *page)
eae1701f 2186{
bb636547
N		 2187 if (mddev->raid_disks == 0)
2188 return 0;
eae1701f
N		 2189 return sprintf(page, "%d\n", mddev->raid_disks);
2190}
2191
da943b99
N		 2192static int update_raid_disks(mddev_t *mddev, int raid_disks);
2193
2194static ssize_t
2195raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2196{
2197 /* can only set raid_disks if array is not yet active */
2198 char *e;
2199 int rv = 0;
2200 unsigned long n = simple_strtoul(buf, &e, 10);
2201
2202 if (!*buf || (*e && *e != '\n'))
2203 return -EINVAL;
2204
2205 if (mddev->pers)
2206 rv = update_raid_disks(mddev, n);
2207 else
2208 mddev->raid_disks = n;
2209 return rv ? rv : len;
2210}
2211static struct md_sysfs_entry md_raid_disks =
2212__ATTR(raid_disks, 0644, raid_disks_show, raid_disks_store);
eae1701f 2213
3b34380a
N		 2214static ssize_t
2215chunk_size_show(mddev_t *mddev, char *page)
2216{
2217 return sprintf(page, "%d\n", mddev->chunk_size);
2218}
2219
2220static ssize_t
2221chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2222{
2223 /* can only set chunk_size if array is not yet active */
2224 char *e;
2225 unsigned long n = simple_strtoul(buf, &e, 10);
2226
2227 if (mddev->pers)
2228 return -EBUSY;
2229 if (!*buf || (*e && *e != '\n'))
2230 return -EINVAL;
2231
2232 mddev->chunk_size = n;
2233 return len;
2234}
2235static struct md_sysfs_entry md_chunk_size =
2236__ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
2237
9e653b63
N		 2238/*
2239 * The array state can be:
2240 *
2241 * clear
2242 * No devices, no size, no level
2243 * Equivalent to STOP_ARRAY ioctl
2244 * inactive
2245 * May have some settings, but array is not active
2246 * all IO results in error
2247 * When written, doesn't tear down array, but just stops it
2248 * suspended (not supported yet)
2249 * All IO requests will block. The array can be reconfigured.
2250 * Writing this, if accepted, will block until array is quiessent
2251 * readonly
2252 * no resync can happen. no superblocks get written.
2253 * write requests fail
2254 * read-auto
2255 * like readonly, but behaves like 'clean' on a write request.
2256 *
2257 * clean - no pending writes, but otherwise active.
2258 * When written to inactive array, starts without resync
2259 * If a write request arrives then
2260 * if metadata is known, mark 'dirty' and switch to 'active'.
2261 * if not known, block and switch to write-pending
2262 * If written to an active array that has pending writes, then fails.
2263 * active
2264 * fully active: IO and resync can be happening.
2265 * When written to inactive array, starts with resync
2266 *
2267 * write-pending
2268 * clean, but writes are blocked waiting for 'active' to be written.
2269 *
2270 * active-idle
2271 * like active, but no writes have been seen for a while (100msec).
2272 *
2273 */
2274enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2275 write_pending, active_idle, bad_word};
2276char *array_states[] = {
2277 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2278 "write-pending", "active-idle", NULL };
2279
2280static int match_word(const char *word, char **list)
2281{
2282 int n;
2283 for (n=0; list[n]; n++)
2284 if (cmd_match(word, list[n]))
2285 break;
2286 return n;
2287}
2288
2289static ssize_t
2290array_state_show(mddev_t *mddev, char *page)
2291{
2292 enum array_state st = inactive;
2293
2294 if (mddev->pers)
2295 switch(mddev->ro) {
2296 case 1:
2297 st = readonly;
2298 break;
2299 case 2:
2300 st = read_auto;
2301 break;
2302 case 0:
2303 if (mddev->in_sync)
2304 st = clean;
2305 else if (mddev->safemode)
2306 st = active_idle;
2307 else
2308 st = active;
2309 }
2310 else {
2311 if (list_empty(&mddev->disks) &&
2312 mddev->raid_disks == 0 &&
2313 mddev->size == 0)
2314 st = clear;
2315 else
2316 st = inactive;
2317 }
2318 return sprintf(page, "%s\n", array_states[st]);
2319}
2320
2321static int do_md_stop(mddev_t * mddev, int ro);
2322static int do_md_run(mddev_t * mddev);
2323static int restart_array(mddev_t *mddev);
2324
2325static ssize_t
2326array_state_store(mddev_t *mddev, const char *buf, size_t len)
2327{
2328 int err = -EINVAL;
2329 enum array_state st = match_word(buf, array_states);
2330 switch(st) {
2331 case bad_word:
2332 break;
2333 case clear:
2334 /* stopping an active array */
2335 if (mddev->pers) {
2336 if (atomic_read(&mddev->active) > 1)
2337 return -EBUSY;
2338 err = do_md_stop(mddev, 0);
2339 }
2340 break;
2341 case inactive:
2342 /* stopping an active array */
2343 if (mddev->pers) {
2344 if (atomic_read(&mddev->active) > 1)
2345 return -EBUSY;
2346 err = do_md_stop(mddev, 2);
2347 }
2348 break;
2349 case suspended:
2350 break; /* not supported yet */
2351 case readonly:
2352 if (mddev->pers)
2353 err = do_md_stop(mddev, 1);
2354 else {
2355 mddev->ro = 1;
2356 err = do_md_run(mddev);
2357 }
2358 break;
2359 case read_auto:
2360 /* stopping an active array */
2361 if (mddev->pers) {
2362 err = do_md_stop(mddev, 1);
2363 if (err == 0)
2364 mddev->ro = 2; /* FIXME mark devices writable */
2365 } else {
2366 mddev->ro = 2;
2367 err = do_md_run(mddev);
2368 }
2369 break;
2370 case clean:
2371 if (mddev->pers) {
2372 restart_array(mddev);
2373 spin_lock_irq(&mddev->write_lock);
2374 if (atomic_read(&mddev->writes_pending) == 0) {
2375 mddev->in_sync = 1;
2376 mddev->sb_dirty = 1;
2377 }
2378 spin_unlock_irq(&mddev->write_lock);
2379 } else {
2380 mddev->ro = 0;
2381 mddev->recovery_cp = MaxSector;
2382 err = do_md_run(mddev);
2383 }
2384 break;
2385 case active:
2386 if (mddev->pers) {
2387 restart_array(mddev);
2388 mddev->sb_dirty = 0;
2389 wake_up(&mddev->sb_wait);
2390 err = 0;
2391 } else {
2392 mddev->ro = 0;
2393 err = do_md_run(mddev);
2394 }
2395 break;
2396 case write_pending:
2397 case active_idle:
2398 /* these cannot be set */
2399 break;
2400 }
2401 if (err)
2402 return err;
2403 else
2404 return len;
2405}
2406static struct md_sysfs_entry md_array_state = __ATTR(array_state, 0644, array_state_show, array_state_store);
2407
6d7ff738
N		 2408static ssize_t
2409null_show(mddev_t *mddev, char *page)
2410{
2411 return -EINVAL;
2412}
2413
2414static ssize_t
2415new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2416{
2417 /* buf must be %d:%d\n? giving major and minor numbers */
2418 /* The new device is added to the array.
2419 * If the array has a persistent superblock, we read the
2420 * superblock to initialise info and check validity.
2421 * Otherwise, only checking done is that in bind_rdev_to_array,
2422 * which mainly checks size.
2423 */
2424 char *e;
2425 int major = simple_strtoul(buf, &e, 10);
2426 int minor;
2427 dev_t dev;
2428 mdk_rdev_t *rdev;
2429 int err;
2430
2431 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2432 return -EINVAL;
2433 minor = simple_strtoul(e+1, &e, 10);
2434 if (*e && *e != '\n')
2435 return -EINVAL;
2436 dev = MKDEV(major, minor);
2437 if (major != MAJOR(dev) ||
2438 minor != MINOR(dev))
2439 return -EOVERFLOW;
2440
2441
2442 if (mddev->persistent) {
2443 rdev = md_import_device(dev, mddev->major_version,
2444 mddev->minor_version);
2445 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2446 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2447 mdk_rdev_t, same_set);
2448 err = super_types[mddev->major_version]
2449 .load_super(rdev, rdev0, mddev->minor_version);
2450 if (err < 0)
2451 goto out;
2452 }
2453 } else
2454 rdev = md_import_device(dev, -1, -1);
2455
2456 if (IS_ERR(rdev))
2457 return PTR_ERR(rdev);
2458 err = bind_rdev_to_array(rdev, mddev);
2459 out:
2460 if (err)
2461 export_rdev(rdev);
2462 return err ? err : len;
2463}
2464
2465static struct md_sysfs_entry md_new_device =
2466__ATTR(new_dev, 0200, null_show, new_dev_store);
3b34380a 2467
a35b0d69
N		 2468static ssize_t
2469size_show(mddev_t *mddev, char *page)
2470{
2471 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2472}
2473
2474static int update_size(mddev_t *mddev, unsigned long size);
2475
2476static ssize_t
2477size_store(mddev_t *mddev, const char *buf, size_t len)
2478{
2479 /* If array is inactive, we can reduce the component size, but
2480 * not increase it (except from 0).
2481 * If array is active, we can try an on-line resize
2482 */
2483 char *e;
2484 int err = 0;
2485 unsigned long long size = simple_strtoull(buf, &e, 10);
2486 if (!*buf || *buf == '\n' ||
2487 (*e && *e != '\n'))
2488 return -EINVAL;
2489
2490 if (mddev->pers) {
2491 err = update_size(mddev, size);
2492 md_update_sb(mddev);
2493 } else {
2494 if (mddev->size == 0 ||
2495 mddev->size > size)
2496 mddev->size = size;
2497 else
2498 err = -ENOSPC;
2499 }
2500 return err ? err : len;
2501}
2502
2503static struct md_sysfs_entry md_size =
2504__ATTR(component_size, 0644, size_show, size_store);
2505
8bb93aac
N		 2506
2507/* Metdata version.
2508 * This is either 'none' for arrays with externally managed metadata,
2509 * or N.M for internally known formats
2510 */
2511static ssize_t
2512metadata_show(mddev_t *mddev, char *page)
2513{
2514 if (mddev->persistent)
2515 return sprintf(page, "%d.%d\n",
2516 mddev->major_version, mddev->minor_version);
2517 else
2518 return sprintf(page, "none\n");
2519}
2520
2521static ssize_t
2522metadata_store(mddev_t *mddev, const char *buf, size_t len)
2523{
2524 int major, minor;
2525 char *e;
2526 if (!list_empty(&mddev->disks))
2527 return -EBUSY;
2528
2529 if (cmd_match(buf, "none")) {
2530 mddev->persistent = 0;
2531 mddev->major_version = 0;
2532 mddev->minor_version = 90;
2533 return len;
2534 }
2535 major = simple_strtoul(buf, &e, 10);
2536 if (e==buf || *e != '.')
2537 return -EINVAL;
2538 buf = e+1;
2539 minor = simple_strtoul(buf, &e, 10);
2540 if (e==buf || *e != '\n')
2541 return -EINVAL;
2542 if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
2543 super_types[major].name == NULL)
2544 return -ENOENT;
2545 mddev->major_version = major;
2546 mddev->minor_version = minor;
2547 mddev->persistent = 1;
2548 return len;
2549}
2550
2551static struct md_sysfs_entry md_metadata =
2552__ATTR(metadata_version, 0644, metadata_show, metadata_store);
2553
24dd469d 2554static ssize_t
7eec314d 2555action_show(mddev_t *mddev, char *page)
24dd469d 2556{
7eec314d 2557 char *type = "idle";
31399d9e
N		 2558 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2559 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
ccfcc3c1
N		 2560 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2561 type = "reshape";
2562 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N		 2563 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2564 type = "resync";
2565 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2566 type = "check";
2567 else
2568 type = "repair";
2569 } else
2570 type = "recover";
2571 }
2572 return sprintf(page, "%s\n", type);
2573}
2574
2575static ssize_t
7eec314d 2576action_store(mddev_t *mddev, const char *page, size_t len)
24dd469d 2577{
7eec314d
N		 2578 if (!mddev->pers || !mddev->pers->sync_request)
2579 return -EINVAL;
2580
bce74dac 2581 if (cmd_match(page, "idle")) {
7eec314d
N		 2582 if (mddev->sync_thread) {
2583 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2584 md_unregister_thread(mddev->sync_thread);
2585 mddev->sync_thread = NULL;
2586 mddev->recovery = 0;
2587 }
03c902e1
N		 2588 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2589 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 2590 return -EBUSY;
03c902e1 2591 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
7eec314d 2592 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
16484bf5
N		 2593 else if (cmd_match(page, "reshape")) {
2594 int err;
2595 if (mddev->pers->start_reshape == NULL)
2596 return -EINVAL;
2597 err = mddev->pers->start_reshape(mddev);
2598 if (err)
2599 return err;
2600 } else {
bce74dac 2601 if (cmd_match(page, "check"))
7eec314d 2602 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2adc7d47 2603 else if (!cmd_match(page, "repair"))
7eec314d
N		 2604 return -EINVAL;
2605 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2606 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7eec314d 2607 }
03c902e1 2608 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d
N		 2609 md_wakeup_thread(mddev->thread);
2610 return len;
2611}
2612
9d88883e 2613static ssize_t
96de1e66 2614mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 2615{
2616 return sprintf(page, "%llu\n",
2617 (unsigned long long) mddev->resync_mismatches);
2618}
2619
96de1e66 2620static struct md_sysfs_entry
7eec314d 2621md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 2622
96de1e66
N		 2623
2624static struct md_sysfs_entry
2625md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 2626
88202a0c
N		 2627static ssize_t
2628sync_min_show(mddev_t *mddev, char *page)
2629{
2630 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2631 mddev->sync_speed_min ? "local": "system");
2632}
2633
2634static ssize_t
2635sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2636{
2637 int min;
2638 char *e;
2639 if (strncmp(buf, "system", 6)==0) {
2640 mddev->sync_speed_min = 0;
2641 return len;
2642 }
2643 min = simple_strtoul(buf, &e, 10);
2644 if (buf == e || (*e && *e != '\n') || min <= 0)
2645 return -EINVAL;
2646 mddev->sync_speed_min = min;
2647 return len;
2648}
2649
2650static struct md_sysfs_entry md_sync_min =
2651__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2652
2653static ssize_t
2654sync_max_show(mddev_t *mddev, char *page)
2655{
2656 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2657 mddev->sync_speed_max ? "local": "system");
2658}
2659
2660static ssize_t
2661sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2662{
2663 int max;
2664 char *e;
2665 if (strncmp(buf, "system", 6)==0) {
2666 mddev->sync_speed_max = 0;
2667 return len;
2668 }
2669 max = simple_strtoul(buf, &e, 10);
2670 if (buf == e || (*e && *e != '\n') || max <= 0)
2671 return -EINVAL;
2672 mddev->sync_speed_max = max;
2673 return len;
2674}
2675
2676static struct md_sysfs_entry md_sync_max =
2677__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2678
2679
2680static ssize_t
2681sync_speed_show(mddev_t *mddev, char *page)
2682{
2683 unsigned long resync, dt, db;
2684 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2685 dt = ((jiffies - mddev->resync_mark) / HZ);
2686 if (!dt) dt++;
2687 db = resync - (mddev->resync_mark_cnt);
2688 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2689}
2690
2691static struct md_sysfs_entry
2692md_sync_speed = __ATTR_RO(sync_speed);
2693
2694static ssize_t
2695sync_completed_show(mddev_t *mddev, char *page)
2696{
2697 unsigned long max_blocks, resync;
2698
2699 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2700 max_blocks = mddev->resync_max_sectors;
2701 else
2702 max_blocks = mddev->size << 1;
2703
2704 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2705 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2706}
2707
2708static struct md_sysfs_entry
2709md_sync_completed = __ATTR_RO(sync_completed);
2710
e464eafd
N		 2711static ssize_t
2712suspend_lo_show(mddev_t *mddev, char *page)
2713{
2714 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
2715}
2716
2717static ssize_t
2718suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
2719{
2720 char *e;
2721 unsigned long long new = simple_strtoull(buf, &e, 10);
2722
2723 if (mddev->pers->quiesce == NULL)
2724 return -EINVAL;
2725 if (buf == e || (*e && *e != '\n'))
2726 return -EINVAL;
2727 if (new >= mddev->suspend_hi ||
2728 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
2729 mddev->suspend_lo = new;
2730 mddev->pers->quiesce(mddev, 2);
2731 return len;
2732 } else
2733 return -EINVAL;
2734}
2735static struct md_sysfs_entry md_suspend_lo =
2736__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
2737
2738
2739static ssize_t
2740suspend_hi_show(mddev_t *mddev, char *page)
2741{
2742 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
2743}
2744
2745static ssize_t
2746suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
2747{
2748 char *e;
2749 unsigned long long new = simple_strtoull(buf, &e, 10);
2750
2751 if (mddev->pers->quiesce == NULL)
2752 return -EINVAL;
2753 if (buf == e || (*e && *e != '\n'))
2754 return -EINVAL;
2755 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
2756 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
2757 mddev->suspend_hi = new;
2758 mddev->pers->quiesce(mddev, 1);
2759 mddev->pers->quiesce(mddev, 0);
2760 return len;
2761 } else
2762 return -EINVAL;
2763}
2764static struct md_sysfs_entry md_suspend_hi =
2765__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
2766
2767
eae1701f
N		 2768static struct attribute *md_default_attrs[] = {
2769 &md_level.attr,
d4dbd025 2770 &md_layout.attr,
eae1701f 2771 &md_raid_disks.attr,
3b34380a 2772 &md_chunk_size.attr,
a35b0d69 2773 &md_size.attr,
8bb93aac 2774 &md_metadata.attr,
6d7ff738 2775 &md_new_device.attr,
16f17b39 2776 &md_safe_delay.attr,
9e653b63 2777 &md_array_state.attr,
411036fa
N		 2778 NULL,
2779};
2780
2781static struct attribute *md_redundancy_attrs[] = {
24dd469d 2782 &md_scan_mode.attr,
9d88883e 2783 &md_mismatches.attr,
88202a0c
N		 2784 &md_sync_min.attr,
2785 &md_sync_max.attr,
2786 &md_sync_speed.attr,
2787 &md_sync_completed.attr,
e464eafd
N		 2788 &md_suspend_lo.attr,
2789 &md_suspend_hi.attr,
eae1701f
N		 2790 NULL,
2791};
411036fa
N		 2792static struct attribute_group md_redundancy_group = {
2793 .name = NULL,
2794 .attrs = md_redundancy_attrs,
2795};
2796
eae1701f
N		 2797
2798static ssize_t
2799md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2800{
2801 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2802 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2803 ssize_t rv;
eae1701f
N		 2804
2805 if (!entry->show)
2806 return -EIO;
5dc5cf7d
IM		 2807 rv = mddev_lock(mddev);
2808 if (!rv) {
2809 rv = entry->show(mddev, page);
2810 mddev_unlock(mddev);
2811 }
96de1e66 2812 return rv;
eae1701f
N		 2813}
2814
2815static ssize_t
2816md_attr_store(struct kobject *kobj, struct attribute *attr,
2817 const char *page, size_t length)
2818{
2819 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2820 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2821 ssize_t rv;
eae1701f
N		 2822
2823 if (!entry->store)
2824 return -EIO;
5dc5cf7d
IM		 2825 rv = mddev_lock(mddev);
2826 if (!rv) {
2827 rv = entry->store(mddev, page, length);
2828 mddev_unlock(mddev);
2829 }
96de1e66 2830 return rv;
eae1701f
N		 2831}
2832
2833static void md_free(struct kobject *ko)
2834{
2835 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2836 kfree(mddev);
2837}
2838
2839static struct sysfs_ops md_sysfs_ops = {
2840 .show = md_attr_show,
2841 .store = md_attr_store,
2842};
2843static struct kobj_type md_ktype = {
2844 .release = md_free,
2845 .sysfs_ops = &md_sysfs_ops,
2846 .default_attrs = md_default_attrs,
2847};
2848
1da177e4
LT		 2849int mdp_major = 0;
2850
2851static struct kobject *md_probe(dev_t dev, int *part, void *data)
2852{
48c9c27b 2853 static DEFINE_MUTEX(disks_mutex);
1da177e4
LT		 2854 mddev_t *mddev = mddev_find(dev);
2855 struct gendisk *disk;
2856 int partitioned = (MAJOR(dev) != MD_MAJOR);
2857 int shift = partitioned ? MdpMinorShift : 0;
2858 int unit = MINOR(dev) >> shift;
2859
2860 if (!mddev)
2861 return NULL;
2862
48c9c27b 2863 mutex_lock(&disks_mutex);
1da177e4 2864 if (mddev->gendisk) {
48c9c27b 2865 mutex_unlock(&disks_mutex);
1da177e4
LT		 2866 mddev_put(mddev);
2867 return NULL;
2868 }
2869 disk = alloc_disk(1 << shift);
2870 if (!disk) {
48c9c27b 2871 mutex_unlock(&disks_mutex);
1da177e4
LT		 2872 mddev_put(mddev);
2873 return NULL;
2874 }
2875 disk->major = MAJOR(dev);
2876 disk->first_minor = unit << shift;
2877 if (partitioned) {
2878 sprintf(disk->disk_name, "md_d%d", unit);
2879 sprintf(disk->devfs_name, "md/d%d", unit);
2880 } else {
2881 sprintf(disk->disk_name, "md%d", unit);
2882 sprintf(disk->devfs_name, "md/%d", unit);
2883 }
2884 disk->fops = &md_fops;
2885 disk->private_data = mddev;
2886 disk->queue = mddev->queue;
2887 add_disk(disk);
2888 mddev->gendisk = disk;
48c9c27b 2889 mutex_unlock(&disks_mutex);
9c791977 2890 mddev->kobj.parent = &disk->kobj;
eae1701f
N		 2891 mddev->kobj.k_name = NULL;
2892 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
2893 mddev->kobj.ktype = &md_ktype;
2894 kobject_register(&mddev->kobj);
1da177e4
LT		 2895 return NULL;
2896}
2897
1da177e4
LT		 2898static void md_safemode_timeout(unsigned long data)
2899{
2900 mddev_t *mddev = (mddev_t *) data;
2901
2902 mddev->safemode = 1;
2903 md_wakeup_thread(mddev->thread);
2904}
2905
6ff8d8ec 2906static int start_dirty_degraded;
1da177e4
LT		 2907
2908static int do_md_run(mddev_t * mddev)
2909{
2604b703 2910 int err;
1da177e4
LT		 2911 int chunk_size;
2912 struct list_head *tmp;
2913 mdk_rdev_t *rdev;
2914 struct gendisk *disk;
2604b703 2915 struct mdk_personality *pers;
1da177e4
LT		 2916 char b[BDEVNAME_SIZE];
2917
a757e64c
N		 2918 if (list_empty(&mddev->disks))
2919 /* cannot run an array with no devices.. */
1da177e4 2920 return -EINVAL;
1da177e4
LT		 2921
2922 if (mddev->pers)
2923 return -EBUSY;
2924
2925 /*
2926 * Analyze all RAID superblock(s)
2927 */
a757e64c
N		 2928 if (!mddev->raid_disks)
2929 analyze_sbs(mddev);
1da177e4
LT		 2930
2931 chunk_size = mddev->chunk_size;
2604b703
N		 2932
2933 if (chunk_size) {
1da177e4
LT		 2934 if (chunk_size > MAX_CHUNK_SIZE) {
2935 printk(KERN_ERR "too big chunk_size: %d > %d\n",
2936 chunk_size, MAX_CHUNK_SIZE);
2937 return -EINVAL;
2938 }
2939 /*
2940 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2941 */
2942 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 2943 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 2944 return -EINVAL;
2945 }
2946 if (chunk_size < PAGE_SIZE) {
2947 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
2948 chunk_size, PAGE_SIZE);
2949 return -EINVAL;
2950 }
2951
2952 /* devices must have minimum size of one chunk */
2953 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2954 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2955 continue;
2956 if (rdev->size < chunk_size / 1024) {
2957 printk(KERN_WARNING
2958 "md: Dev %s smaller than chunk_size:"
2959 " %lluk < %dk\n",
2960 bdevname(rdev->bdev,b),
2961 (unsigned long long)rdev->size,
2962 chunk_size / 1024);
2963 return -EINVAL;
2964 }
2965 }
2966 }
2967
1da177e4 2968#ifdef CONFIG_KMOD
d9d166c2
N		 2969 if (mddev->level != LEVEL_NONE)
2970 request_module("md-level-%d", mddev->level);
2971 else if (mddev->clevel[0])
2972 request_module("md-%s", mddev->clevel);
1da177e4
LT		 2973#endif
2974
2975 /*
2976 * Drop all container device buffers, from now on
2977 * the only valid external interface is through the md
2978 * device.
2979 * Also find largest hardsector size
2980 */
2981 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2982 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2983 continue;
2984 sync_blockdev(rdev->bdev);
2985 invalidate_bdev(rdev->bdev, 0);
2986 }
2987
2988 md_probe(mddev->unit, NULL, NULL);
2989 disk = mddev->gendisk;
2990 if (!disk)
2991 return -ENOMEM;
2992
2993 spin_lock(&pers_lock);
d9d166c2 2994 pers = find_pers(mddev->level, mddev->clevel);
2604b703 2995 if (!pers || !try_module_get(pers->owner)) {
1da177e4 2996 spin_unlock(&pers_lock);
d9d166c2
N		 2997 if (mddev->level != LEVEL_NONE)
2998 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
2999 mddev->level);
3000 else
3001 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3002 mddev->clevel);
1da177e4
LT		 3003 return -EINVAL;
3004 }
2604b703 3005 mddev->pers = pers;
1da177e4 3006 spin_unlock(&pers_lock);
d9d166c2
N		 3007 mddev->level = pers->level;
3008 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
1da177e4 3009
f6705578 3010 if (mddev->reshape_position != MaxSector &&
63c70c4f 3011 pers->start_reshape == NULL) {
f6705578
N		 3012 /* This personality cannot handle reshaping... */
3013 mddev->pers = NULL;
3014 module_put(pers->owner);
3015 return -EINVAL;
3016 }
3017
657390d2 3018 mddev->recovery = 0;
1da177e4 3019 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 3020 mddev->barriers_work = 1;
6ff8d8ec 3021 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 3022
f91de92e
N		 3023 if (start_readonly)
3024 mddev->ro = 2; /* read-only, but switch on first write */
3025
b15c2e57
N		 3026 err = mddev->pers->run(mddev);
3027 if (!err && mddev->pers->sync_request) {
3028 err = bitmap_create(mddev);
3029 if (err) {
3030 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3031 mdname(mddev), err);
3032 mddev->pers->stop(mddev);
3033 }
3034 }
1da177e4
LT		 3035 if (err) {
3036 printk(KERN_ERR "md: pers->run() failed ...\n");
3037 module_put(mddev->pers->owner);
3038 mddev->pers = NULL;
32a7627c
N		 3039 bitmap_destroy(mddev);
3040 return err;
1da177e4 3041 }
411036fa
N		 3042 if (mddev->pers->sync_request)
3043 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
fd9d49ca
N		 3044 else if (mddev->ro == 2) /* auto-readonly not meaningful */
3045 mddev->ro = 0;
3046
1da177e4
LT		 3047 atomic_set(&mddev->writes_pending,0);
3048 mddev->safemode = 0;
3049 mddev->safemode_timer.function = md_safemode_timeout;
3050 mddev->safemode_timer.data = (unsigned long) mddev;
16f17b39 3051 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
1da177e4 3052 mddev->in_sync = 1;
86e6ffdd
N		 3053
3054 ITERATE_RDEV(mddev,rdev,tmp)
3055 if (rdev->raid_disk >= 0) {
3056 char nm[20];
3057 sprintf(nm, "rd%d", rdev->raid_disk);
3058 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
3059 }
1da177e4
LT		 3060
3061 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 3062 md_wakeup_thread(mddev->thread);
1da177e4
LT		 3063
3064 if (mddev->sb_dirty)
3065 md_update_sb(mddev);
3066
3067 set_capacity(disk, mddev->array_size<<1);
3068
3069 /* If we call blk_queue_make_request here, it will
3070 * re-initialise max_sectors etc which may have been
3071 * refined inside -> run. So just set the bits we need to set.
3072 * Most initialisation happended when we called
3073 * blk_queue_make_request(..., md_fail_request)
3074 * earlier.
3075 */
3076 mddev->queue->queuedata = mddev;
3077 mddev->queue->make_request_fn = mddev->pers->make_request;
3078
5fd6c1dc
N		 3079 /* If there is a partially-recovered drive we need to
3080 * start recovery here. If we leave it to md_check_recovery,
3081 * it will remove the drives and not do the right thing
3082 */
3083 if (mddev->degraded) {
3084 struct list_head *rtmp;
3085 int spares = 0;
3086 ITERATE_RDEV(mddev,rdev,rtmp)
3087 if (rdev->raid_disk >= 0 &&
3088 !test_bit(In_sync, &rdev->flags) &&
3089 !test_bit(Faulty, &rdev->flags))
3090 /* complete an interrupted recovery */
3091 spares++;
3092 if (spares && mddev->pers->sync_request) {
3093 mddev->recovery = 0;
3094 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3095 mddev->sync_thread = md_register_thread(md_do_sync,
3096 mddev,
3097 "%s_resync");
3098 if (!mddev->sync_thread) {
3099 printk(KERN_ERR "%s: could not start resync"
3100 " thread...\n",
3101 mdname(mddev));
3102 /* leave the spares where they are, it shouldn't hurt */
3103 mddev->recovery = 0;
3104 } else
3105 md_wakeup_thread(mddev->sync_thread);
3106 }
3107 }
3108
1da177e4 3109 mddev->changed = 1;
d7603b7e 3110 md_new_event(mddev);
1da177e4
LT		 3111 return 0;
3112}
3113
3114static int restart_array(mddev_t *mddev)
3115{
3116 struct gendisk *disk = mddev->gendisk;
3117 int err;
3118
3119 /*
3120 * Complain if it has no devices
3121 */
3122 err = -ENXIO;
3123 if (list_empty(&mddev->disks))
3124 goto out;
3125
3126 if (mddev->pers) {
3127 err = -EBUSY;
3128 if (!mddev->ro)
3129 goto out;
3130
3131 mddev->safemode = 0;
3132 mddev->ro = 0;
3133 set_disk_ro(disk, 0);
3134
3135 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3136 mdname(mddev));
3137 /*
3138 * Kick recovery or resync if necessary
3139 */
3140 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3141 md_wakeup_thread(mddev->thread);
5fd6c1dc 3142 md_wakeup_thread(mddev->sync_thread);
1da177e4 3143 err = 0;
9e653b63 3144 } else
1da177e4 3145 err = -EINVAL;
1da177e4
LT		 3146
3147out:
3148 return err;
3149}
3150
acc55e22
N		 3151/* similar to deny_write_access, but accounts for our holding a reference
3152 * to the file ourselves */
3153static int deny_bitmap_write_access(struct file * file)
3154{
3155 struct inode *inode = file->f_mapping->host;
3156
3157 spin_lock(&inode->i_lock);
3158 if (atomic_read(&inode->i_writecount) > 1) {
3159 spin_unlock(&inode->i_lock);
3160 return -ETXTBSY;
3161 }
3162 atomic_set(&inode->i_writecount, -1);
3163 spin_unlock(&inode->i_lock);
3164
3165 return 0;
3166}
3167
3168static void restore_bitmap_write_access(struct file *file)
3169{
3170 struct inode *inode = file->f_mapping->host;
3171
3172 spin_lock(&inode->i_lock);
3173 atomic_set(&inode->i_writecount, 1);
3174 spin_unlock(&inode->i_lock);
3175}
3176
9e653b63
N		 3177/* mode:
3178 * 0 - completely stop and dis-assemble array
3179 * 1 - switch to readonly
3180 * 2 - stop but do not disassemble array
3181 */
3182static int do_md_stop(mddev_t * mddev, int mode)
1da177e4
LT		 3183{
3184 int err = 0;
3185 struct gendisk *disk = mddev->gendisk;
3186
3187 if (mddev->pers) {
3188 if (atomic_read(&mddev->active)>2) {
3189 printk("md: %s still in use.\n",mdname(mddev));
3190 return -EBUSY;
3191 }
3192
3193 if (mddev->sync_thread) {
5fd6c1dc 3194 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4
LT		 3195 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3196 md_unregister_thread(mddev->sync_thread);
3197 mddev->sync_thread = NULL;
3198 }
3199
3200 del_timer_sync(&mddev->safemode_timer);
3201
3202 invalidate_partition(disk, 0);
3203
9e653b63
N		 3204 switch(mode) {
3205 case 1: /* readonly */
1da177e4 3206 err = -ENXIO;
f91de92e 3207 if (mddev->ro==1)
1da177e4
LT		 3208 goto out;
3209 mddev->ro = 1;
9e653b63
N		 3210 break;
3211 case 0: /* disassemble */
3212 case 2: /* stop */
6b8b3e8a 3213 bitmap_flush(mddev);
a9701a30 3214 md_super_wait(mddev);
1da177e4
LT		 3215 if (mddev->ro)
3216 set_disk_ro(disk, 0);
3217 blk_queue_make_request(mddev->queue, md_fail_request);
3218 mddev->pers->stop(mddev);
411036fa
N		 3219 if (mddev->pers->sync_request)
3220 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3221
1da177e4
LT		 3222 module_put(mddev->pers->owner);
3223 mddev->pers = NULL;
3224 if (mddev->ro)
3225 mddev->ro = 0;
3226 }
5fd6c1dc 3227 if (!mddev->in_sync || mddev->sb_dirty) {
1da177e4
LT		 3228 /* mark array as shutdown cleanly */
3229 mddev->in_sync = 1;
3230 md_update_sb(mddev);
3231 }
9e653b63 3232 if (mode == 1)
1da177e4 3233 set_disk_ro(disk, 1);
5fd6c1dc 3234 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4 3235 }
32a7627c 3236
1da177e4
LT		 3237 /*
3238 * Free resources if final stop
3239 */
9e653b63 3240 if (mode == 0) {
86e6ffdd
N		 3241 mdk_rdev_t *rdev;
3242 struct list_head *tmp;
1da177e4
LT		 3243 struct gendisk *disk;
3244 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3245
978f946b
N		 3246 bitmap_destroy(mddev);
3247 if (mddev->bitmap_file) {
acc55e22 3248 restore_bitmap_write_access(mddev->bitmap_file);
978f946b
N		 3249 fput(mddev->bitmap_file);
3250 mddev->bitmap_file = NULL;
3251 }
3252 mddev->bitmap_offset = 0;
3253
86e6ffdd
N		 3254 ITERATE_RDEV(mddev,rdev,tmp)
3255 if (rdev->raid_disk >= 0) {
3256 char nm[20];
3257 sprintf(nm, "rd%d", rdev->raid_disk);
3258 sysfs_remove_link(&mddev->kobj, nm);
3259 }
3260
1da177e4
LT		 3261 export_array(mddev);
3262
3263 mddev->array_size = 0;
9e653b63
N		 3264 mddev->size = 0;
3265 mddev->raid_disks = 0;
3266
1da177e4
LT		 3267 disk = mddev->gendisk;
3268 if (disk)
3269 set_capacity(disk, 0);
3270 mddev->changed = 1;
a8a55c38 3271 } else if (mddev->pers)
1da177e4
LT		 3272 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3273 mdname(mddev));
3274 err = 0;
d7603b7e 3275 md_new_event(mddev);
1da177e4
LT		 3276out:
3277 return err;
3278}
3279
3280static void autorun_array(mddev_t *mddev)
3281{
3282 mdk_rdev_t *rdev;
3283 struct list_head *tmp;
3284 int err;
3285
a757e64c 3286 if (list_empty(&mddev->disks))
1da177e4 3287 return;
1da177e4
LT		 3288
3289 printk(KERN_INFO "md: running: ");
3290
3291 ITERATE_RDEV(mddev,rdev,tmp) {
3292 char b[BDEVNAME_SIZE];
3293 printk("<%s>", bdevname(rdev->bdev,b));
3294 }
3295 printk("\n");
3296
3297 err = do_md_run (mddev);
3298 if (err) {
3299 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3300 do_md_stop (mddev, 0);
3301 }
3302}
3303
3304/*
3305 * lets try to run arrays based on all disks that have arrived
3306 * until now. (those are in pending_raid_disks)
3307 *
3308 * the method: pick the first pending disk, collect all disks with
3309 * the same UUID, remove all from the pending list and put them into
3310 * the 'same_array' list. Then order this list based on superblock
3311 * update time (freshest comes first), kick out 'old' disks and
3312 * compare superblocks. If everything's fine then run it.
3313 *
3314 * If "unit" is allocated, then bump its reference count
3315 */
3316static void autorun_devices(int part)
3317{
1da177e4
LT		 3318 struct list_head *tmp;
3319 mdk_rdev_t *rdev0, *rdev;
3320 mddev_t *mddev;
3321 char b[BDEVNAME_SIZE];
3322
3323 printk(KERN_INFO "md: autorun ...\n");
3324 while (!list_empty(&pending_raid_disks)) {
3325 dev_t dev;
ad01c9e3 3326 LIST_HEAD(candidates);
1da177e4
LT		 3327 rdev0 = list_entry(pending_raid_disks.next,
3328 mdk_rdev_t, same_set);
3329
3330 printk(KERN_INFO "md: considering %s ...\n",
3331 bdevname(rdev0->bdev,b));
3332 INIT_LIST_HEAD(&candidates);
3333 ITERATE_RDEV_PENDING(rdev,tmp)
3334 if (super_90_load(rdev, rdev0, 0) >= 0) {
3335 printk(KERN_INFO "md: adding %s ...\n",
3336 bdevname(rdev->bdev,b));
3337 list_move(&rdev->same_set, &candidates);
3338 }
3339 /*
3340 * now we have a set of devices, with all of them having
3341 * mostly sane superblocks. It's time to allocate the
3342 * mddev.
3343 */
3344 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
3345 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3346 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3347 break;
3348 }
3349 if (part)
3350 dev = MKDEV(mdp_major,
3351 rdev0->preferred_minor << MdpMinorShift);
3352 else
3353 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3354
3355 md_probe(dev, NULL, NULL);
3356 mddev = mddev_find(dev);
3357 if (!mddev) {
3358 printk(KERN_ERR
3359 "md: cannot allocate memory for md drive.\n");
3360 break;
3361 }
3362 if (mddev_lock(mddev))
3363 printk(KERN_WARNING "md: %s locked, cannot run\n",
3364 mdname(mddev));
3365 else if (mddev->raid_disks || mddev->major_version
3366 || !list_empty(&mddev->disks)) {
3367 printk(KERN_WARNING
3368 "md: %s already running, cannot run %s\n",
3369 mdname(mddev), bdevname(rdev0->bdev,b));
3370 mddev_unlock(mddev);
3371 } else {
3372 printk(KERN_INFO "md: created %s\n", mdname(mddev));
3373 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
3374 list_del_init(&rdev->same_set);
3375 if (bind_rdev_to_array(rdev, mddev))
3376 export_rdev(rdev);
3377 }
3378 autorun_array(mddev);
3379 mddev_unlock(mddev);
3380 }
3381 /* on success, candidates will be empty, on error
3382 * it won't...
3383 */
3384 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
3385 export_rdev(rdev);
3386 mddev_put(mddev);
3387 }
3388 printk(KERN_INFO "md: ... autorun DONE.\n");
3389}
3390
3391/*
3392 * import RAID devices based on one partition
3393 * if possible, the array gets run as well.
3394 */
3395
3396static int autostart_array(dev_t startdev)
3397{
3398 char b[BDEVNAME_SIZE];
3399 int err = -EINVAL, i;
3400 mdp_super_t *sb = NULL;
3401 mdk_rdev_t *start_rdev = NULL, *rdev;
3402
3403 start_rdev = md_import_device(startdev, 0, 0);
3404 if (IS_ERR(start_rdev))
3405 return err;
3406
3407
3408 /* NOTE: this can only work for 0.90.0 superblocks */
3409 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
3410 if (sb->major_version != 0 ||
3411 sb->minor_version != 90 ) {
3412 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
3413 export_rdev(start_rdev);
3414 return err;
3415 }
3416
b2d444d7 3417 if (test_bit(Faulty, &start_rdev->flags)) {
1da177e4
LT		 3418 printk(KERN_WARNING
3419 "md: can not autostart based on faulty %s!\n",
3420 bdevname(start_rdev->bdev,b));
3421 export_rdev(start_rdev);
3422 return err;
3423 }
3424 list_add(&start_rdev->same_set, &pending_raid_disks);
3425
3426 for (i = 0; i < MD_SB_DISKS; i++) {
3427 mdp_disk_t *desc = sb->disks + i;
3428 dev_t dev = MKDEV(desc->major, desc->minor);
3429
3430 if (!dev)
3431 continue;
3432 if (dev == startdev)
3433 continue;
3434 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
3435 continue;
3436 rdev = md_import_device(dev, 0, 0);
3437 if (IS_ERR(rdev))
3438 continue;
3439
3440 list_add(&rdev->same_set, &pending_raid_disks);
3441 }
3442
3443 /*
3444 * possibly return codes
3445 */
3446 autorun_devices(0);
3447 return 0;
3448
3449}
3450
3451
3452static int get_version(void __user * arg)
3453{
3454 mdu_version_t ver;
3455
3456 ver.major = MD_MAJOR_VERSION;
3457 ver.minor = MD_MINOR_VERSION;
3458 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3459
3460 if (copy_to_user(arg, &ver, sizeof(ver)))
3461 return -EFAULT;
3462
3463 return 0;
3464}
3465
3466static int get_array_info(mddev_t * mddev, void __user * arg)
3467{
3468 mdu_array_info_t info;
3469 int nr,working,active,failed,spare;
3470 mdk_rdev_t *rdev;
3471 struct list_head *tmp;
3472
3473 nr=working=active=failed=spare=0;
3474 ITERATE_RDEV(mddev,rdev,tmp) {
3475 nr++;
b2d444d7 3476 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3477 failed++;
3478 else {
3479 working++;
b2d444d7 3480 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 3481 active++;
3482 else
3483 spare++;
3484 }
3485 }
3486
3487 info.major_version = mddev->major_version;
3488 info.minor_version = mddev->minor_version;
3489 info.patch_version = MD_PATCHLEVEL_VERSION;
3490 info.ctime = mddev->ctime;
3491 info.level = mddev->level;
3492 info.size = mddev->size;
284ae7ca
N		 3493 if (info.size != mddev->size) /* overflow */
3494 info.size = -1;
1da177e4
LT		 3495 info.nr_disks = nr;
3496 info.raid_disks = mddev->raid_disks;
3497 info.md_minor = mddev->md_minor;
3498 info.not_persistent= !mddev->persistent;
3499
3500 info.utime = mddev->utime;
3501 info.state = 0;
3502 if (mddev->in_sync)
3503 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 3504 if (mddev->bitmap && mddev->bitmap_offset)
3505 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 3506 info.active_disks = active;
3507 info.working_disks = working;
3508 info.failed_disks = failed;
3509 info.spare_disks = spare;
3510
3511 info.layout = mddev->layout;
3512 info.chunk_size = mddev->chunk_size;
3513
3514 if (copy_to_user(arg, &info, sizeof(info)))
3515 return -EFAULT;
3516
3517 return 0;
3518}
3519
87162a28 3520static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 3521{
3522 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3523 char *ptr, *buf = NULL;
3524 int err = -ENOMEM;
3525
3526 file = kmalloc(sizeof(*file), GFP_KERNEL);
3527 if (!file)
3528 goto out;
3529
3530 /* bitmap disabled, zero the first byte and copy out */
3531 if (!mddev->bitmap || !mddev->bitmap->file) {
3532 file->pathname[0] = '\0';
3533 goto copy_out;
3534 }
3535
3536 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3537 if (!buf)
3538 goto out;
3539
3540 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3541 if (!ptr)
3542 goto out;
3543
3544 strcpy(file->pathname, ptr);
3545
3546copy_out:
3547 err = 0;
3548 if (copy_to_user(arg, file, sizeof(*file)))
3549 err = -EFAULT;
3550out:
3551 kfree(buf);
3552 kfree(file);
3553 return err;
3554}
3555
1da177e4
LT		 3556static int get_disk_info(mddev_t * mddev, void __user * arg)
3557{
3558 mdu_disk_info_t info;
3559 unsigned int nr;
3560 mdk_rdev_t *rdev;
3561
3562 if (copy_from_user(&info, arg, sizeof(info)))
3563 return -EFAULT;
3564
3565 nr = info.number;
3566
3567 rdev = find_rdev_nr(mddev, nr);
3568 if (rdev) {
3569 info.major = MAJOR(rdev->bdev->bd_dev);
3570 info.minor = MINOR(rdev->bdev->bd_dev);
3571 info.raid_disk = rdev->raid_disk;
3572 info.state = 0;
b2d444d7 3573 if (test_bit(Faulty, &rdev->flags))
1da177e4 3574 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 3575 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 3576 info.state |= (1<<MD_DISK_ACTIVE);
3577 info.state |= (1<<MD_DISK_SYNC);
3578 }
8ddf9efe
N		 3579 if (test_bit(WriteMostly, &rdev->flags))
3580 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 3581 } else {
3582 info.major = info.minor = 0;
3583 info.raid_disk = -1;
3584 info.state = (1<<MD_DISK_REMOVED);
3585 }
3586
3587 if (copy_to_user(arg, &info, sizeof(info)))
3588 return -EFAULT;
3589
3590 return 0;
3591}
3592
3593static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3594{
3595 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3596 mdk_rdev_t *rdev;
3597 dev_t dev = MKDEV(info->major,info->minor);
3598
3599 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3600 return -EOVERFLOW;
3601
3602 if (!mddev->raid_disks) {
3603 int err;
3604 /* expecting a device which has a superblock */
3605 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3606 if (IS_ERR(rdev)) {
3607 printk(KERN_WARNING
3608 "md: md_import_device returned %ld\n",
3609 PTR_ERR(rdev));
3610 return PTR_ERR(rdev);
3611 }
3612 if (!list_empty(&mddev->disks)) {
3613 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3614 mdk_rdev_t, same_set);
3615 int err = super_types[mddev->major_version]
3616 .load_super(rdev, rdev0, mddev->minor_version);
3617 if (err < 0) {
3618 printk(KERN_WARNING
3619 "md: %s has different UUID to %s\n",
3620 bdevname(rdev->bdev,b),
3621 bdevname(rdev0->bdev,b2));
3622 export_rdev(rdev);
3623 return -EINVAL;
3624 }
3625 }
3626 err = bind_rdev_to_array(rdev, mddev);
3627 if (err)
3628 export_rdev(rdev);
3629 return err;
3630 }
3631
3632 /*
3633 * add_new_disk can be used once the array is assembled
3634 * to add "hot spares". They must already have a superblock
3635 * written
3636 */
3637 if (mddev->pers) {
3638 int err;
3639 if (!mddev->pers->hot_add_disk) {
3640 printk(KERN_WARNING
3641 "%s: personality does not support diskops!\n",
3642 mdname(mddev));
3643 return -EINVAL;
3644 }
7b1e35f6
N		 3645 if (mddev->persistent)
3646 rdev = md_import_device(dev, mddev->major_version,
3647 mddev->minor_version);
3648 else
3649 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 3650 if (IS_ERR(rdev)) {
3651 printk(KERN_WARNING
3652 "md: md_import_device returned %ld\n",
3653 PTR_ERR(rdev));
3654 return PTR_ERR(rdev);
3655 }
41158c7e
N		 3656 /* set save_raid_disk if appropriate */
3657 if (!mddev->persistent) {
3658 if (info->state & (1<<MD_DISK_SYNC) &&
3659 info->raid_disk < mddev->raid_disks)
3660 rdev->raid_disk = info->raid_disk;
3661 else
3662 rdev->raid_disk = -1;
3663 } else
3664 super_types[mddev->major_version].
3665 validate_super(mddev, rdev);
3666 rdev->saved_raid_disk = rdev->raid_disk;
3667
b2d444d7 3668 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 3669 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3670 set_bit(WriteMostly, &rdev->flags);
3671
1da177e4
LT		 3672 rdev->raid_disk = -1;
3673 err = bind_rdev_to_array(rdev, mddev);
7c7546cc
N		 3674 if (!err && !mddev->pers->hot_remove_disk) {
3675 /* If there is hot_add_disk but no hot_remove_disk
3676 * then added disks for geometry changes,
3677 * and should be added immediately.
3678 */
3679 super_types[mddev->major_version].
3680 validate_super(mddev, rdev);
3681 err = mddev->pers->hot_add_disk(mddev, rdev);
3682 if (err)
3683 unbind_rdev_from_array(rdev);
3684 }
1da177e4
LT		 3685 if (err)
3686 export_rdev(rdev);
c361777f
N		 3687
3688 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 3689 md_wakeup_thread(mddev->thread);
1da177e4
LT		 3690 return err;
3691 }
3692
3693 /* otherwise, add_new_disk is only allowed
3694 * for major_version==0 superblocks
3695 */
3696 if (mddev->major_version != 0) {
3697 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3698 mdname(mddev));
3699 return -EINVAL;
3700 }
3701
3702 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3703 int err;
3704 rdev = md_import_device (dev, -1, 0);
3705 if (IS_ERR(rdev)) {
3706 printk(KERN_WARNING
3707 "md: error, md_import_device() returned %ld\n",
3708 PTR_ERR(rdev));
3709 return PTR_ERR(rdev);
3710 }
3711 rdev->desc_nr = info->number;
3712 if (info->raid_disk < mddev->raid_disks)
3713 rdev->raid_disk = info->raid_disk;
3714 else
3715 rdev->raid_disk = -1;
3716
b2d444d7
N		 3717 rdev->flags = 0;
3718
1da177e4 3719 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 3720 if (info->state & (1<<MD_DISK_SYNC))
3721 set_bit(In_sync, &rdev->flags);
1da177e4 3722
8ddf9efe
N		 3723 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3724 set_bit(WriteMostly, &rdev->flags);
3725
1da177e4
LT		 3726 if (!mddev->persistent) {
3727 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3728 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3729 } else
3730 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3731 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3732
2bf071bf
N		 3733 err = bind_rdev_to_array(rdev, mddev);
3734 if (err) {
3735 export_rdev(rdev);
3736 return err;
3737 }
1da177e4
LT		 3738 }
3739
3740 return 0;
3741}
3742
3743static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3744{
3745 char b[BDEVNAME_SIZE];
3746 mdk_rdev_t *rdev;
3747
3748 if (!mddev->pers)
3749 return -ENODEV;
3750
3751 rdev = find_rdev(mddev, dev);
3752 if (!rdev)
3753 return -ENXIO;
3754
3755 if (rdev->raid_disk >= 0)
3756 goto busy;
3757
3758 kick_rdev_from_array(rdev);
3759 md_update_sb(mddev);
d7603b7e 3760 md_new_event(mddev);
1da177e4
LT		 3761
3762 return 0;
3763busy:
3764 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3765 bdevname(rdev->bdev,b), mdname(mddev));
3766 return -EBUSY;
3767}
3768
3769static int hot_add_disk(mddev_t * mddev, dev_t dev)
3770{
3771 char b[BDEVNAME_SIZE];
3772 int err;
3773 unsigned int size;
3774 mdk_rdev_t *rdev;
3775
3776 if (!mddev->pers)
3777 return -ENODEV;
3778
3779 if (mddev->major_version != 0) {
3780 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3781 " version-0 superblocks.\n",
3782 mdname(mddev));
3783 return -EINVAL;
3784 }
3785 if (!mddev->pers->hot_add_disk) {
3786 printk(KERN_WARNING
3787 "%s: personality does not support diskops!\n",
3788 mdname(mddev));
3789 return -EINVAL;
3790 }
3791
3792 rdev = md_import_device (dev, -1, 0);
3793 if (IS_ERR(rdev)) {
3794 printk(KERN_WARNING
3795 "md: error, md_import_device() returned %ld\n",
3796 PTR_ERR(rdev));
3797 return -EINVAL;
3798 }
3799
3800 if (mddev->persistent)
3801 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3802 else
3803 rdev->sb_offset =
3804 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3805
3806 size = calc_dev_size(rdev, mddev->chunk_size);
3807 rdev->size = size;
3808
b2d444d7 3809 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 3810 printk(KERN_WARNING
3811 "md: can not hot-add faulty %s disk to %s!\n",
3812 bdevname(rdev->bdev,b), mdname(mddev));
3813 err = -EINVAL;
3814 goto abort_export;
3815 }
b2d444d7 3816 clear_bit(In_sync, &rdev->flags);
1da177e4 3817 rdev->desc_nr = -1;
2bf071bf
N		 3818 err = bind_rdev_to_array(rdev, mddev);
3819 if (err)
3820 goto abort_export;
1da177e4
LT		 3821
3822 /*
3823 * The rest should better be atomic, we can have disk failures
3824 * noticed in interrupt contexts ...
3825 */
3826
3827 if (rdev->desc_nr == mddev->max_disks) {
3828 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
3829 mdname(mddev));
3830 err = -EBUSY;
3831 goto abort_unbind_export;
3832 }
3833
3834 rdev->raid_disk = -1;
3835
3836 md_update_sb(mddev);
3837
3838 /*
3839 * Kick recovery, maybe this spare has to be added to the
3840 * array immediately.
3841 */
3842 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3843 md_wakeup_thread(mddev->thread);
d7603b7e 3844 md_new_event(mddev);
1da177e4
LT		 3845 return 0;
3846
3847abort_unbind_export:
3848 unbind_rdev_from_array(rdev);
3849
3850abort_export:
3851 export_rdev(rdev);
3852 return err;
3853}
3854
32a7627c
N		 3855static int set_bitmap_file(mddev_t *mddev, int fd)
3856{
3857 int err;
3858
36fa3063
N		 3859 if (mddev->pers) {
3860 if (!mddev->pers->quiesce)
3861 return -EBUSY;
3862 if (mddev->recovery || mddev->sync_thread)
3863 return -EBUSY;
3864 /* we should be able to change the bitmap.. */
3865 }
32a7627c 3866
32a7627c 3867
36fa3063
N		 3868 if (fd >= 0) {
3869 if (mddev->bitmap)
3870 return -EEXIST; /* cannot add when bitmap is present */
3871 mddev->bitmap_file = fget(fd);
32a7627c 3872
36fa3063
N		 3873 if (mddev->bitmap_file == NULL) {
3874 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
3875 mdname(mddev));
3876 return -EBADF;
3877 }
3878
3879 err = deny_bitmap_write_access(mddev->bitmap_file);
3880 if (err) {
3881 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
3882 mdname(mddev));
3883 fput(mddev->bitmap_file);
3884 mddev->bitmap_file = NULL;
3885 return err;
3886 }
a654b9d8 3887 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 3888 } else if (mddev->bitmap == NULL)
3889 return -ENOENT; /* cannot remove what isn't there */
3890 err = 0;
3891 if (mddev->pers) {
3892 mddev->pers->quiesce(mddev, 1);
3893 if (fd >= 0)
3894 err = bitmap_create(mddev);
d7375ab3 3895 if (fd < 0 || err) {
36fa3063 3896 bitmap_destroy(mddev);
d7375ab3
N		 3897 fd = -1; /* make sure to put the file */
3898 }
36fa3063 3899 mddev->pers->quiesce(mddev, 0);
d7375ab3
N		 3900 }
3901 if (fd < 0) {
acc55e22
N		 3902 if (mddev->bitmap_file) {
3903 restore_bitmap_write_access(mddev->bitmap_file);
36fa3063 3904 fput(mddev->bitmap_file);
acc55e22 3905 }
36fa3063
N		 3906 mddev->bitmap_file = NULL;
3907 }
3908
32a7627c
N		 3909 return err;
3910}
3911
1da177e4
LT		 3912/*
3913 * set_array_info is used two different ways
3914 * The original usage is when creating a new array.
3915 * In this usage, raid_disks is > 0 and it together with
3916 * level, size, not_persistent,layout,chunksize determine the
3917 * shape of the array.
3918 * This will always create an array with a type-0.90.0 superblock.
3919 * The newer usage is when assembling an array.
3920 * In this case raid_disks will be 0, and the major_version field is
3921 * use to determine which style super-blocks are to be found on the devices.
3922 * The minor and patch _version numbers are also kept incase the
3923 * super_block handler wishes to interpret them.
3924 */
3925static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
3926{
3927
3928 if (info->raid_disks == 0) {
3929 /* just setting version number for superblock loading */
3930 if (info->major_version < 0 ||
3931 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
3932 super_types[info->major_version].name == NULL) {
3933 /* maybe try to auto-load a module? */
3934 printk(KERN_INFO
3935 "md: superblock version %d not known\n",
3936 info->major_version);
3937 return -EINVAL;
3938 }
3939 mddev->major_version = info->major_version;
3940 mddev->minor_version = info->minor_version;
3941 mddev->patch_version = info->patch_version;
3942 return 0;
3943 }
3944 mddev->major_version = MD_MAJOR_VERSION;
3945 mddev->minor_version = MD_MINOR_VERSION;
3946 mddev->patch_version = MD_PATCHLEVEL_VERSION;
3947 mddev->ctime = get_seconds();
3948
3949 mddev->level = info->level;
17115e03 3950 mddev->clevel[0] = 0;
1da177e4
LT		 3951 mddev->size = info->size;
3952 mddev->raid_disks = info->raid_disks;
3953 /* don't set md_minor, it is determined by which /dev/md* was
3954 * openned
3955 */
3956 if (info->state & (1<<MD_SB_CLEAN))
3957 mddev->recovery_cp = MaxSector;
3958 else
3959 mddev->recovery_cp = 0;
3960 mddev->persistent = ! info->not_persistent;
3961
3962 mddev->layout = info->layout;
3963 mddev->chunk_size = info->chunk_size;
3964
3965 mddev->max_disks = MD_SB_DISKS;
3966
3967 mddev->sb_dirty = 1;
3968
b2a2703c
N		 3969 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
3970 mddev->bitmap_offset = 0;
3971
f6705578
N		 3972 mddev->reshape_position = MaxSector;
3973
1da177e4
LT		 3974 /*
3975 * Generate a 128 bit UUID
3976 */
3977 get_random_bytes(mddev->uuid, 16);
3978
f6705578
N		 3979 mddev->new_level = mddev->level;
3980 mddev->new_chunk = mddev->chunk_size;
3981 mddev->new_layout = mddev->layout;
3982 mddev->delta_disks = 0;
3983
1da177e4
LT		 3984 return 0;
3985}
3986
a35b0d69
N		 3987static int update_size(mddev_t *mddev, unsigned long size)
3988{
3989 mdk_rdev_t * rdev;
3990 int rv;
3991 struct list_head *tmp;
8ddeeae5 3992 int fit = (size == 0);
a35b0d69
N		 3993
3994 if (mddev->pers->resize == NULL)
3995 return -EINVAL;
3996 /* The "size" is the amount of each device that is used.
3997 * This can only make sense for arrays with redundancy.
3998 * linear and raid0 always use whatever space is available
3999 * We can only consider changing the size if no resync
4000 * or reconstruction is happening, and if the new size
4001 * is acceptable. It must fit before the sb_offset or,
4002 * if that is <data_offset, it must fit before the
4003 * size of each device.
4004 * If size is zero, we find the largest size that fits.
4005 */
4006 if (mddev->sync_thread)
4007 return -EBUSY;
4008 ITERATE_RDEV(mddev,rdev,tmp) {
4009 sector_t avail;
a35b0d69
N		 4010 if (rdev->sb_offset > rdev->data_offset)
4011 avail = (rdev->sb_offset*2) - rdev->data_offset;
4012 else
4013 avail = get_capacity(rdev->bdev->bd_disk)
4014 - rdev->data_offset;
4015 if (fit && (size == 0 || size > avail/2))
4016 size = avail/2;
4017 if (avail < ((sector_t)size << 1))
4018 return -ENOSPC;
4019 }
4020 rv = mddev->pers->resize(mddev, (sector_t)size *2);
4021 if (!rv) {
4022 struct block_device *bdev;
4023
4024 bdev = bdget_disk(mddev->gendisk, 0);
4025 if (bdev) {
1b1dcc1b 4026 mutex_lock(&bdev->bd_inode->i_mutex);
6d89332b 4027 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
1b1dcc1b 4028 mutex_unlock(&bdev->bd_inode->i_mutex);
a35b0d69
N		 4029 bdput(bdev);
4030 }
4031 }
4032 return rv;
4033}
4034
da943b99
N		 4035static int update_raid_disks(mddev_t *mddev, int raid_disks)
4036{
4037 int rv;
4038 /* change the number of raid disks */
63c70c4f 4039 if (mddev->pers->check_reshape == NULL)
da943b99
N		 4040 return -EINVAL;
4041 if (raid_disks <= 0 ||
4042 raid_disks >= mddev->max_disks)
4043 return -EINVAL;
63c70c4f 4044 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
da943b99 4045 return -EBUSY;
63c70c4f
N		 4046 mddev->delta_disks = raid_disks - mddev->raid_disks;
4047
4048 rv = mddev->pers->check_reshape(mddev);
da943b99
N		 4049 return rv;
4050}
4051
4052
1da177e4
LT		 4053/*
4054 * update_array_info is used to change the configuration of an
4055 * on-line array.
4056 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4057 * fields in the info are checked against the array.
4058 * Any differences that cannot be handled will cause an error.
4059 * Normally, only one change can be managed at a time.
4060 */
4061static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4062{
4063 int rv = 0;
4064 int cnt = 0;
36fa3063
N		 4065 int state = 0;
4066
4067 /* calculate expected state,ignoring low bits */
4068 if (mddev->bitmap && mddev->bitmap_offset)
4069 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 4070
4071 if (mddev->major_version != info->major_version ||
4072 mddev->minor_version != info->minor_version ||
4073/* mddev->patch_version != info->patch_version || */
4074 mddev->ctime != info->ctime ||
4075 mddev->level != info->level ||
4076/* mddev->layout != info->layout || */
4077 !mddev->persistent != info->not_persistent||
36fa3063
N		 4078 mddev->chunk_size != info->chunk_size ||
4079 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4080 ((state^info->state) & 0xfffffe00)
4081 )
1da177e4
LT		 4082 return -EINVAL;
4083 /* Check there is only one change */
284ae7ca 4084 if (info->size >= 0 && mddev->size != info->size) cnt++;
1da177e4
LT		 4085 if (mddev->raid_disks != info->raid_disks) cnt++;
4086 if (mddev->layout != info->layout) cnt++;
36fa3063 4087 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 4088 if (cnt == 0) return 0;
4089 if (cnt > 1) return -EINVAL;
4090
4091 if (mddev->layout != info->layout) {
4092 /* Change layout
4093 * we don't need to do anything at the md level, the
4094 * personality will take care of it all.
4095 */
4096 if (mddev->pers->reconfig == NULL)
4097 return -EINVAL;
4098 else
4099 return mddev->pers->reconfig(mddev, info->layout, -1);
4100 }
284ae7ca 4101 if (info->size >= 0 && mddev->size != info->size)
a35b0d69
N		 4102 rv = update_size(mddev, info->size);
4103
da943b99
N		 4104 if (mddev->raid_disks != info->raid_disks)
4105 rv = update_raid_disks(mddev, info->raid_disks);
4106
36fa3063
N		 4107 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4108 if (mddev->pers->quiesce == NULL)
4109 return -EINVAL;
4110 if (mddev->recovery || mddev->sync_thread)
4111 return -EBUSY;
4112 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4113 /* add the bitmap */
4114 if (mddev->bitmap)
4115 return -EEXIST;
4116 if (mddev->default_bitmap_offset == 0)
4117 return -EINVAL;
4118 mddev->bitmap_offset = mddev->default_bitmap_offset;
4119 mddev->pers->quiesce(mddev, 1);
4120 rv = bitmap_create(mddev);
4121 if (rv)
4122 bitmap_destroy(mddev);
4123 mddev->pers->quiesce(mddev, 0);
4124 } else {
4125 /* remove the bitmap */
4126 if (!mddev->bitmap)
4127 return -ENOENT;
4128 if (mddev->bitmap->file)
4129 return -EINVAL;
4130 mddev->pers->quiesce(mddev, 1);
4131 bitmap_destroy(mddev);
4132 mddev->pers->quiesce(mddev, 0);
4133 mddev->bitmap_offset = 0;
4134 }
4135 }
1da177e4
LT		 4136 md_update_sb(mddev);
4137 return rv;
4138}
4139
4140static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4141{
4142 mdk_rdev_t *rdev;
4143
4144 if (mddev->pers == NULL)
4145 return -ENODEV;
4146
4147 rdev = find_rdev(mddev, dev);
4148 if (!rdev)
4149 return -ENODEV;
4150
4151 md_error(mddev, rdev);
4152 return 0;
4153}
4154
a885c8c4
CH		 4155static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4156{
4157 mddev_t *mddev = bdev->bd_disk->private_data;
4158
4159 geo->heads = 2;
4160 geo->sectors = 4;
4161 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4162 return 0;
4163}
4164
1da177e4
LT		 4165static int md_ioctl(struct inode *inode, struct file *file,
4166 unsigned int cmd, unsigned long arg)
4167{
4168 int err = 0;
4169 void __user *argp = (void __user *)arg;
1da177e4
LT		 4170 mddev_t *mddev = NULL;
4171
4172 if (!capable(CAP_SYS_ADMIN))
4173 return -EACCES;
4174
4175 /*
4176 * Commands dealing with the RAID driver but not any
4177 * particular array:
4178 */
4179 switch (cmd)
4180 {
4181 case RAID_VERSION:
4182 err = get_version(argp);
4183 goto done;
4184
4185 case PRINT_RAID_DEBUG:
4186 err = 0;
4187 md_print_devices();
4188 goto done;
4189
4190#ifndef MODULE
4191 case RAID_AUTORUN:
4192 err = 0;
4193 autostart_arrays(arg);
4194 goto done;
4195#endif
4196 default:;
4197 }
4198
4199 /*
4200 * Commands creating/starting a new array:
4201 */
4202
4203 mddev = inode->i_bdev->bd_disk->private_data;
4204
4205 if (!mddev) {
4206 BUG();
4207 goto abort;
4208 }
4209
4210
4211 if (cmd == START_ARRAY) {
4212 /* START_ARRAY doesn't need to lock the array as autostart_array
4213 * does the locking, and it could even be a different array
4214 */
4215 static int cnt = 3;
4216 if (cnt > 0 ) {
4217 printk(KERN_WARNING
4218 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
e8a00334 4219 "This will not be supported beyond July 2006\n",
1da177e4
LT		 4220 current->comm, current->pid);
4221 cnt--;
4222 }
4223 err = autostart_array(new_decode_dev(arg));
4224 if (err) {
4225 printk(KERN_WARNING "md: autostart failed!\n");
4226 goto abort;
4227 }
4228 goto done;
4229 }
4230
4231 err = mddev_lock(mddev);
4232 if (err) {
4233 printk(KERN_INFO
4234 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4235 err, cmd);
4236 goto abort;
4237 }
4238
4239 switch (cmd)
4240 {
4241 case SET_ARRAY_INFO:
4242 {
4243 mdu_array_info_t info;
4244 if (!arg)
4245 memset(&info, 0, sizeof(info));
4246 else if (copy_from_user(&info, argp, sizeof(info))) {
4247 err = -EFAULT;
4248 goto abort_unlock;
4249 }
4250 if (mddev->pers) {
4251 err = update_array_info(mddev, &info);
4252 if (err) {
4253 printk(KERN_WARNING "md: couldn't update"
4254 " array info. %d\n", err);
4255 goto abort_unlock;
4256 }
4257 goto done_unlock;
4258 }
4259 if (!list_empty(&mddev->disks)) {
4260 printk(KERN_WARNING
4261 "md: array %s already has disks!\n",
4262 mdname(mddev));
4263 err = -EBUSY;
4264 goto abort_unlock;
4265 }
4266 if (mddev->raid_disks) {
4267 printk(KERN_WARNING
4268 "md: array %s already initialised!\n",
4269 mdname(mddev));
4270 err = -EBUSY;
4271 goto abort_unlock;
4272 }
4273 err = set_array_info(mddev, &info);
4274 if (err) {
4275 printk(KERN_WARNING "md: couldn't set"
4276 " array info. %d\n", err);
4277 goto abort_unlock;
4278 }
4279 }
4280 goto done_unlock;
4281
4282 default:;
4283 }
4284
4285 /*
4286 * Commands querying/configuring an existing array:
4287 */
32a7627c
N		 4288 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4289 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
4290 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4291 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
1da177e4
LT		 4292 err = -ENODEV;
4293 goto abort_unlock;
4294 }
4295
4296 /*
4297 * Commands even a read-only array can execute:
4298 */
4299 switch (cmd)
4300 {
4301 case GET_ARRAY_INFO:
4302 err = get_array_info(mddev, argp);
4303 goto done_unlock;
4304
32a7627c 4305 case GET_BITMAP_FILE:
87162a28 4306 err = get_bitmap_file(mddev, argp);
32a7627c
N		 4307 goto done_unlock;
4308
1da177e4
LT		 4309 case GET_DISK_INFO:
4310 err = get_disk_info(mddev, argp);
4311 goto done_unlock;
4312
4313 case RESTART_ARRAY_RW:
4314 err = restart_array(mddev);
4315 goto done_unlock;
4316
4317 case STOP_ARRAY:
4318 err = do_md_stop (mddev, 0);
4319 goto done_unlock;
4320
4321 case STOP_ARRAY_RO:
4322 err = do_md_stop (mddev, 1);
4323 goto done_unlock;
4324
4325 /*
4326 * We have a problem here : there is no easy way to give a CHS
4327 * virtual geometry. We currently pretend that we have a 2 heads
4328 * 4 sectors (with a BIG number of cylinders...). This drives
4329 * dosfs just mad... ;-)
4330 */
1da177e4
LT		 4331 }
4332
4333 /*
4334 * The remaining ioctls are changing the state of the
f91de92e
N		 4335 * superblock, so we do not allow them on read-only arrays.
4336 * However non-MD ioctls (e.g. get-size) will still come through
4337 * here and hit the 'default' below, so only disallow
4338 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 4339 */
f91de92e
N		 4340 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4341 mddev->ro && mddev->pers) {
4342 if (mddev->ro == 2) {
4343 mddev->ro = 0;
4344 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4345 md_wakeup_thread(mddev->thread);
4346
4347 } else {
4348 err = -EROFS;
4349 goto abort_unlock;
4350 }
1da177e4
LT		 4351 }
4352
4353 switch (cmd)
4354 {
4355 case ADD_NEW_DISK:
4356 {
4357 mdu_disk_info_t info;
4358 if (copy_from_user(&info, argp, sizeof(info)))
4359 err = -EFAULT;
4360 else
4361 err = add_new_disk(mddev, &info);
4362 goto done_unlock;
4363 }
4364
4365 case HOT_REMOVE_DISK:
4366 err = hot_remove_disk(mddev, new_decode_dev(arg));
4367 goto done_unlock;
4368
4369 case HOT_ADD_DISK:
4370 err = hot_add_disk(mddev, new_decode_dev(arg));
4371 goto done_unlock;
4372
4373 case SET_DISK_FAULTY:
4374 err = set_disk_faulty(mddev, new_decode_dev(arg));
4375 goto done_unlock;
4376
4377 case RUN_ARRAY:
4378 err = do_md_run (mddev);
4379 goto done_unlock;
4380
32a7627c
N		 4381 case SET_BITMAP_FILE:
4382 err = set_bitmap_file(mddev, (int)arg);
4383 goto done_unlock;
4384
1da177e4 4385 default:
1da177e4
LT		 4386 err = -EINVAL;
4387 goto abort_unlock;
4388 }
4389
4390done_unlock:
4391abort_unlock:
4392 mddev_unlock(mddev);
4393
4394 return err;
4395done:
4396 if (err)
4397 MD_BUG();
4398abort:
4399 return err;
4400}
4401
4402static int md_open(struct inode *inode, struct file *file)
4403{
4404 /*
4405 * Succeed if we can lock the mddev, which confirms that
4406 * it isn't being stopped right now.
4407 */
4408 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4409 int err;
4410
4411 if ((err = mddev_lock(mddev)))
4412 goto out;
4413
4414 err = 0;
4415 mddev_get(mddev);
4416 mddev_unlock(mddev);
4417
4418 check_disk_change(inode->i_bdev);
4419 out:
4420 return err;
4421}
4422
4423static int md_release(struct inode *inode, struct file * file)
4424{
4425 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4426
4427 if (!mddev)
4428 BUG();
4429 mddev_put(mddev);
4430
4431 return 0;
4432}
4433
4434static int md_media_changed(struct gendisk *disk)
4435{
4436 mddev_t *mddev = disk->private_data;
4437
4438 return mddev->changed;
4439}
4440
4441static int md_revalidate(struct gendisk *disk)
4442{
4443 mddev_t *mddev = disk->private_data;
4444
4445 mddev->changed = 0;
4446 return 0;
4447}
4448static struct block_device_operations md_fops =
4449{
4450 .owner = THIS_MODULE,
4451 .open = md_open,
4452 .release = md_release,
4453 .ioctl = md_ioctl,
a885c8c4 4454 .getgeo = md_getgeo,
1da177e4
LT		 4455 .media_changed = md_media_changed,
4456 .revalidate_disk= md_revalidate,
4457};
4458
75c96f85 4459static int md_thread(void * arg)
1da177e4
LT		 4460{
4461 mdk_thread_t *thread = arg;
4462
1da177e4
LT		 4463 /*
4464 * md_thread is a 'system-thread', it's priority should be very
4465 * high. We avoid resource deadlocks individually in each
4466 * raid personality. (RAID5 does preallocation) We also use RR and
4467 * the very same RT priority as kswapd, thus we will never get
4468 * into a priority inversion deadlock.
4469 *
4470 * we definitely have to have equal or higher priority than
4471 * bdflush, otherwise bdflush will deadlock if there are too
4472 * many dirty RAID5 blocks.
4473 */
1da177e4 4474
6985c43f 4475 allow_signal(SIGKILL);
a6fb0934 4476 while (!kthread_should_stop()) {
1da177e4 4477
93588e22
N		 4478 /* We need to wait INTERRUPTIBLE so that
4479 * we don't add to the load-average.
4480 * That means we need to be sure no signals are
4481 * pending
4482 */
4483 if (signal_pending(current))
4484 flush_signals(current);
4485
4486 wait_event_interruptible_timeout
4487 (thread->wqueue,
4488 test_bit(THREAD_WAKEUP, &thread->flags)
4489 || kthread_should_stop(),
4490 thread->timeout);
3e1d1d28 4491 try_to_freeze();
1da177e4
LT		 4492
4493 clear_bit(THREAD_WAKEUP, &thread->flags);
4494
787453c2 4495 thread->run(thread->mddev);
1da177e4 4496 }
a6fb0934 4497
1da177e4
LT		 4498 return 0;
4499}
4500
4501void md_wakeup_thread(mdk_thread_t *thread)
4502{
4503 if (thread) {
4504 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4505 set_bit(THREAD_WAKEUP, &thread->flags);
4506 wake_up(&thread->wqueue);
4507 }
4508}
4509
4510mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4511 const char *name)
4512{
4513 mdk_thread_t *thread;
1da177e4 4514
9ffae0cf 4515 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 4516 if (!thread)
4517 return NULL;
4518
1da177e4
LT		 4519 init_waitqueue_head(&thread->wqueue);
4520
1da177e4
LT		 4521 thread->run = run;
4522 thread->mddev = mddev;
32a7627c 4523 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 4524 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 4525 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 4526 kfree(thread);
4527 return NULL;
4528 }
1da177e4
LT		 4529 return thread;
4530}
4531
1da177e4
LT		 4532void md_unregister_thread(mdk_thread_t *thread)
4533{
d28446fe 4534 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
a6fb0934
N		 4535
4536 kthread_stop(thread->tsk);
1da177e4
LT		 4537 kfree(thread);
4538}
4539
4540void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4541{
4542 if (!mddev) {
4543 MD_BUG();
4544 return;
4545 }
4546
b2d444d7 4547 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 4548 return;
32a7627c 4549/*
1da177e4
LT		 4550 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4551 mdname(mddev),
4552 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4553 __builtin_return_address(0),__builtin_return_address(1),
4554 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 4555*/
1da177e4
LT		 4556 if (!mddev->pers->error_handler)
4557 return;
4558 mddev->pers->error_handler(mddev,rdev);
4559 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4560 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4561 md_wakeup_thread(mddev->thread);
c331eb04 4562 md_new_event_inintr(mddev);
1da177e4
LT		 4563}
4564
4565/* seq_file implementation /proc/mdstat */
4566
4567static void status_unused(struct seq_file *seq)
4568{
4569 int i = 0;
4570 mdk_rdev_t *rdev;
4571 struct list_head *tmp;
4572
4573 seq_printf(seq, "unused devices: ");
4574
4575 ITERATE_RDEV_PENDING(rdev,tmp) {
4576 char b[BDEVNAME_SIZE];
4577 i++;
4578 seq_printf(seq, "%s ",
4579 bdevname(rdev->bdev,b));
4580 }
4581 if (!i)
4582 seq_printf(seq, "<none>");
4583
4584 seq_printf(seq, "\n");
4585}
4586
4587
4588static void status_resync(struct seq_file *seq, mddev_t * mddev)
4589{
4588b42e
N		 4590 sector_t max_blocks, resync, res;
4591 unsigned long dt, db, rt;
4592 int scale;
4593 unsigned int per_milli;
1da177e4
LT		 4594
4595 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4596
4597 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4598 max_blocks = mddev->resync_max_sectors >> 1;
4599 else
4600 max_blocks = mddev->size;
4601
4602 /*
4603 * Should not happen.
4604 */
4605 if (!max_blocks) {
4606 MD_BUG();
4607 return;
4608 }
4588b42e
N		 4609 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4610 * in a sector_t, and (max_blocks>>scale) will fit in a
4611 * u32, as those are the requirements for sector_div.
4612 * Thus 'scale' must be at least 10
4613 */
4614 scale = 10;
4615 if (sizeof(sector_t) > sizeof(unsigned long)) {
4616 while ( max_blocks/2 > (1ULL<<(scale+32)))
4617 scale++;
4618 }
4619 res = (resync>>scale)*1000;
4620 sector_div(res, (u32)((max_blocks>>scale)+1));
4621
4622 per_milli = res;
1da177e4 4623 {
4588b42e 4624 int i, x = per_milli/50, y = 20-x;
1da177e4
LT		 4625 seq_printf(seq, "[");
4626 for (i = 0; i < x; i++)
4627 seq_printf(seq, "=");
4628 seq_printf(seq, ">");
4629 for (i = 0; i < y; i++)
4630 seq_printf(seq, ".");
4631 seq_printf(seq, "] ");
4632 }
4588b42e 4633 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
ccfcc3c1
N		 4634 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
4635 "reshape" :
1da177e4 4636 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
ccfcc3c1 4637 "resync" : "recovery")),
4588b42e
N		 4638 per_milli/10, per_milli % 10,
4639 (unsigned long long) resync,
4640 (unsigned long long) max_blocks);
1da177e4
LT		 4641
4642 /*
4643 * We do not want to overflow, so the order of operands and
4644 * the * 100 / 100 trick are important. We do a +1 to be
4645 * safe against division by zero. We only estimate anyway.
4646 *
4647 * dt: time from mark until now
4648 * db: blocks written from mark until now
4649 * rt: remaining time
4650 */
4651 dt = ((jiffies - mddev->resync_mark) / HZ);
4652 if (!dt) dt++;
4653 db = resync - (mddev->resync_mark_cnt/2);
4588b42e 4654 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/100+1)))/100;
1da177e4
LT		 4655
4656 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4657
4658 seq_printf(seq, " speed=%ldK/sec", db/dt);
4659}
4660
4661static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4662{
4663 struct list_head *tmp;
4664 loff_t l = *pos;
4665 mddev_t *mddev;
4666
4667 if (l >= 0x10000)
4668 return NULL;
4669 if (!l--)
4670 /* header */
4671 return (void*)1;
4672
4673 spin_lock(&all_mddevs_lock);
4674 list_for_each(tmp,&all_mddevs)
4675 if (!l--) {
4676 mddev = list_entry(tmp, mddev_t, all_mddevs);
4677 mddev_get(mddev);
4678 spin_unlock(&all_mddevs_lock);
4679 return mddev;
4680 }
4681 spin_unlock(&all_mddevs_lock);
4682 if (!l--)
4683 return (void*)2;/* tail */
4684 return NULL;
4685}
4686
4687static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4688{
4689 struct list_head *tmp;
4690 mddev_t *next_mddev, *mddev = v;
4691
4692 ++*pos;
4693 if (v == (void*)2)
4694 return NULL;
4695
4696 spin_lock(&all_mddevs_lock);
4697 if (v == (void*)1)
4698 tmp = all_mddevs.next;
4699 else
4700 tmp = mddev->all_mddevs.next;
4701 if (tmp != &all_mddevs)
4702 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4703 else {
4704 next_mddev = (void*)2;
4705 *pos = 0x10000;
4706 }
4707 spin_unlock(&all_mddevs_lock);
4708
4709 if (v != (void*)1)
4710 mddev_put(mddev);
4711 return next_mddev;
4712
4713}
4714
4715static void md_seq_stop(struct seq_file *seq, void *v)
4716{
4717 mddev_t *mddev = v;
4718
4719 if (mddev && v != (void*)1 && v != (void*)2)
4720 mddev_put(mddev);
4721}
4722
d7603b7e
N		 4723struct mdstat_info {
4724 int event;
4725};
4726
1da177e4
LT		 4727static int md_seq_show(struct seq_file *seq, void *v)
4728{
4729 mddev_t *mddev = v;
4730 sector_t size;
4731 struct list_head *tmp2;
4732 mdk_rdev_t *rdev;
d7603b7e 4733 struct mdstat_info *mi = seq->private;
32a7627c 4734 struct bitmap *bitmap;
1da177e4
LT		 4735
4736 if (v == (void*)1) {
2604b703 4737 struct mdk_personality *pers;
1da177e4
LT		 4738 seq_printf(seq, "Personalities : ");
4739 spin_lock(&pers_lock);
2604b703
N		 4740 list_for_each_entry(pers, &pers_list, list)
4741 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT		 4742
4743 spin_unlock(&pers_lock);
4744 seq_printf(seq, "\n");
d7603b7e 4745 mi->event = atomic_read(&md_event_count);
1da177e4
LT		 4746 return 0;
4747 }
4748 if (v == (void*)2) {
4749 status_unused(seq);
4750 return 0;
4751 }
4752
5dc5cf7d 4753 if (mddev_lock(mddev) < 0)
1da177e4 4754 return -EINTR;
5dc5cf7d 4755
1da177e4
LT		 4756 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4757 seq_printf(seq, "%s : %sactive", mdname(mddev),
4758 mddev->pers ? "" : "in");
4759 if (mddev->pers) {
f91de92e 4760 if (mddev->ro==1)
1da177e4 4761 seq_printf(seq, " (read-only)");
f91de92e
N		 4762 if (mddev->ro==2)
4763 seq_printf(seq, "(auto-read-only)");
1da177e4
LT		 4764 seq_printf(seq, " %s", mddev->pers->name);
4765 }
4766
4767 size = 0;
4768 ITERATE_RDEV(mddev,rdev,tmp2) {
4769 char b[BDEVNAME_SIZE];
4770 seq_printf(seq, " %s[%d]",
4771 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 4772 if (test_bit(WriteMostly, &rdev->flags))
4773 seq_printf(seq, "(W)");
b2d444d7 4774 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4775 seq_printf(seq, "(F)");
4776 continue;
b325a32e
N		 4777 } else if (rdev->raid_disk < 0)
4778 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 4779 size += rdev->size;
4780 }
4781
4782 if (!list_empty(&mddev->disks)) {
4783 if (mddev->pers)
4784 seq_printf(seq, "\n %llu blocks",
4785 (unsigned long long)mddev->array_size);
4786 else
4787 seq_printf(seq, "\n %llu blocks",
4788 (unsigned long long)size);
4789 }
1cd6bf19
N		 4790 if (mddev->persistent) {
4791 if (mddev->major_version != 0 ||
4792 mddev->minor_version != 90) {
4793 seq_printf(seq," super %d.%d",
4794 mddev->major_version,
4795 mddev->minor_version);
4796 }
4797 } else
4798 seq_printf(seq, " super non-persistent");
1da177e4
LT		 4799
4800 if (mddev->pers) {
4801 mddev->pers->status (seq, mddev);
4802 seq_printf(seq, "\n ");
8e1b39d6
N		 4803 if (mddev->pers->sync_request) {
4804 if (mddev->curr_resync > 2) {
4805 status_resync (seq, mddev);
4806 seq_printf(seq, "\n ");
4807 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4808 seq_printf(seq, "\tresync=DELAYED\n ");
4809 else if (mddev->recovery_cp < MaxSector)
4810 seq_printf(seq, "\tresync=PENDING\n ");
4811 }
32a7627c
N		 4812 } else
4813 seq_printf(seq, "\n ");
4814
4815 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 4816 unsigned long chunk_kb;
4817 unsigned long flags;
32a7627c
N		 4818 spin_lock_irqsave(&bitmap->lock, flags);
4819 chunk_kb = bitmap->chunksize >> 10;
4820 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
4821 "%lu%s chunk",
4822 bitmap->pages - bitmap->missing_pages,
4823 bitmap->pages,
4824 (bitmap->pages - bitmap->missing_pages)
4825 << (PAGE_SHIFT - 10),
4826 chunk_kb ? chunk_kb : bitmap->chunksize,
4827 chunk_kb ? "KB" : "B");
78d742d8
N		 4828 if (bitmap->file) {
4829 seq_printf(seq, ", file: ");
4830 seq_path(seq, bitmap->file->f_vfsmnt,
4831 bitmap->file->f_dentry," \t\n");
32a7627c 4832 }
78d742d8 4833
32a7627c
N		 4834 seq_printf(seq, "\n");
4835 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 4836 }
4837
4838 seq_printf(seq, "\n");
4839 }
4840 mddev_unlock(mddev);
4841
4842 return 0;
4843}
4844
4845static struct seq_operations md_seq_ops = {
4846 .start = md_seq_start,
4847 .next = md_seq_next,
4848 .stop = md_seq_stop,
4849 .show = md_seq_show,
4850};
4851
4852static int md_seq_open(struct inode *inode, struct file *file)
4853{
4854 int error;
d7603b7e
N		 4855 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
4856 if (mi == NULL)
4857 return -ENOMEM;
1da177e4
LT		 4858
4859 error = seq_open(file, &md_seq_ops);
d7603b7e
N		 4860 if (error)
4861 kfree(mi);
4862 else {
4863 struct seq_file *p = file->private_data;
4864 p->private = mi;
4865 mi->event = atomic_read(&md_event_count);
4866 }
1da177e4
LT		 4867 return error;
4868}
4869
d7603b7e
N		 4870static int md_seq_release(struct inode *inode, struct file *file)
4871{
4872 struct seq_file *m = file->private_data;
4873 struct mdstat_info *mi = m->private;
4874 m->private = NULL;
4875 kfree(mi);
4876 return seq_release(inode, file);
4877}
4878
4879static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
4880{
4881 struct seq_file *m = filp->private_data;
4882 struct mdstat_info *mi = m->private;
4883 int mask;
4884
4885 poll_wait(filp, &md_event_waiters, wait);
4886
4887 /* always allow read */
4888 mask = POLLIN | POLLRDNORM;
4889
4890 if (mi->event != atomic_read(&md_event_count))
4891 mask |= POLLERR | POLLPRI;
4892 return mask;
4893}
4894
1da177e4
LT		 4895static struct file_operations md_seq_fops = {
4896 .open = md_seq_open,
4897 .read = seq_read,
4898 .llseek = seq_lseek,
d7603b7e
N		 4899 .release = md_seq_release,
4900 .poll = mdstat_poll,
1da177e4
LT		 4901};
4902
2604b703 4903int register_md_personality(struct mdk_personality *p)
1da177e4 4904{
1da177e4 4905 spin_lock(&pers_lock);
2604b703
N		 4906 list_add_tail(&p->list, &pers_list);
4907 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
1da177e4
LT		 4908 spin_unlock(&pers_lock);
4909 return 0;
4910}
4911
2604b703 4912int unregister_md_personality(struct mdk_personality *p)
1da177e4 4913{
2604b703 4914 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 4915 spin_lock(&pers_lock);
2604b703 4916 list_del_init(&p->list);
1da177e4
LT		 4917 spin_unlock(&pers_lock);
4918 return 0;
4919}
4920
4921static int is_mddev_idle(mddev_t *mddev)
4922{
4923 mdk_rdev_t * rdev;
4924 struct list_head *tmp;
4925 int idle;
4926 unsigned long curr_events;
4927
4928 idle = 1;
4929 ITERATE_RDEV(mddev,rdev,tmp) {
4930 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 4931 curr_events = disk_stat_read(disk, sectors[0]) +
4932 disk_stat_read(disk, sectors[1]) -
1da177e4 4933 atomic_read(&disk->sync_io);
c0e48521
N		 4934 /* The difference between curr_events and last_events
4935 * will be affected by any new non-sync IO (making
4936 * curr_events bigger) and any difference in the amount of
4937 * in-flight syncio (making current_events bigger or smaller)
4938 * The amount in-flight is currently limited to
4939 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4940 * which is at most 4096 sectors.
4941 * These numbers are fairly fragile and should be made
4942 * more robust, probably by enforcing the
4943 * 'window size' that md_do_sync sort-of uses.
4944 *
1da177e4
LT		 4945 * Note: the following is an unsigned comparison.
4946 */
c0e48521 4947 if ((curr_events - rdev->last_events + 4096) > 8192) {
1da177e4
LT		 4948 rdev->last_events = curr_events;
4949 idle = 0;
4950 }
4951 }
4952 return idle;
4953}
4954
4955void md_done_sync(mddev_t *mddev, int blocks, int ok)
4956{
4957 /* another "blocks" (512byte) blocks have been synced */
4958 atomic_sub(blocks, &mddev->recovery_active);
4959 wake_up(&mddev->recovery_wait);
4960 if (!ok) {
4961 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4962 md_wakeup_thread(mddev->thread);
4963 // stop recovery, signal do_sync ....
4964 }
4965}
4966
4967
06d91a5f
N		 4968/* md_write_start(mddev, bi)
4969 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 4970 * in superblock) before writing, schedule a superblock update
4971 * and wait for it to complete.
06d91a5f 4972 */
3d310eb7 4973void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 4974{
06d91a5f 4975 if (bio_data_dir(bi) != WRITE)
3d310eb7 4976 return;
06d91a5f 4977
f91de92e
N		 4978 BUG_ON(mddev->ro == 1);
4979 if (mddev->ro == 2) {
4980 /* need to switch to read/write */
4981 mddev->ro = 0;
4982 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4983 md_wakeup_thread(mddev->thread);
4984 }
06d91a5f 4985 atomic_inc(&mddev->writes_pending);
06d91a5f 4986 if (mddev->in_sync) {
a9701a30 4987 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 4988 if (mddev->in_sync) {
4989 mddev->in_sync = 0;
42543769 4990 mddev->sb_dirty = 3;
3d310eb7
N		 4991 md_wakeup_thread(mddev->thread);
4992 }
a9701a30 4993 spin_unlock_irq(&mddev->write_lock);
06d91a5f 4994 }
3d310eb7 4995 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
1da177e4
LT		 4996}
4997
4998void md_write_end(mddev_t *mddev)
4999{
5000 if (atomic_dec_and_test(&mddev->writes_pending)) {
5001 if (mddev->safemode == 2)
5002 md_wakeup_thread(mddev->thread);
16f17b39 5003 else if (mddev->safemode_delay)
1da177e4
LT		 5004 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5005 }
5006}
5007
75c96f85 5008static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
1da177e4
LT		 5009
5010#define SYNC_MARKS 10
5011#define SYNC_MARK_STEP (3*HZ)
29269553 5012void md_do_sync(mddev_t *mddev)
1da177e4
LT		 5013{
5014 mddev_t *mddev2;
5015 unsigned int currspeed = 0,
5016 window;
57afd89f 5017 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 5018 unsigned long mark[SYNC_MARKS];
5019 sector_t mark_cnt[SYNC_MARKS];
5020 int last_mark,m;
5021 struct list_head *tmp;
5022 sector_t last_check;
57afd89f 5023 int skipped = 0;
5fd6c1dc
N		 5024 struct list_head *rtmp;
5025 mdk_rdev_t *rdev;
1da177e4
LT		 5026
5027 /* just incase thread restarts... */
5028 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5029 return;
5fd6c1dc
N		 5030 if (mddev->ro) /* never try to sync a read-only array */
5031 return;
1da177e4
LT		 5032
5033 /* we overload curr_resync somewhat here.
5034 * 0 == not engaged in resync at all
5035 * 2 == checking that there is no conflict with another sync
5036 * 1 == like 2, but have yielded to allow conflicting resync to
5037 * commense
5038 * other == active in resync - this many blocks
5039 *
5040 * Before starting a resync we must have set curr_resync to
5041 * 2, and then checked that every "conflicting" array has curr_resync
5042 * less than ours. When we find one that is the same or higher
5043 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5044 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5045 * This will mean we have to start checking from the beginning again.
5046 *
5047 */
5048
5049 do {
5050 mddev->curr_resync = 2;
5051
5052 try_again:
787453c2 5053 if (kthread_should_stop()) {
6985c43f 5054 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 5055 goto skip;
5056 }
5057 ITERATE_MDDEV(mddev2,tmp) {
1da177e4
LT		 5058 if (mddev2 == mddev)
5059 continue;
5060 if (mddev2->curr_resync &&
5061 match_mddev_units(mddev,mddev2)) {
5062 DEFINE_WAIT(wq);
5063 if (mddev < mddev2 && mddev->curr_resync == 2) {
5064 /* arbitrarily yield */
5065 mddev->curr_resync = 1;
5066 wake_up(&resync_wait);
5067 }
5068 if (mddev > mddev2 && mddev->curr_resync == 1)
5069 /* no need to wait here, we can wait the next
5070 * time 'round when curr_resync == 2
5071 */
5072 continue;
787453c2
N		 5073 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5074 if (!kthread_should_stop() &&
8712e553 5075 mddev2->curr_resync >= mddev->curr_resync) {
1da177e4
LT		 5076 printk(KERN_INFO "md: delaying resync of %s"
5077 " until %s has finished resync (they"
5078 " share one or more physical units)\n",
5079 mdname(mddev), mdname(mddev2));
5080 mddev_put(mddev2);
5081 schedule();
5082 finish_wait(&resync_wait, &wq);
5083 goto try_again;
5084 }
5085 finish_wait(&resync_wait, &wq);
5086 }
5087 }
5088 } while (mddev->curr_resync < 2);
5089
5fd6c1dc 5090 j = 0;
9d88883e 5091 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 5092 /* resync follows the size requested by the personality,
57afd89f 5093 * which defaults to physical size, but can be virtual size
1da177e4
LT		 5094 */
5095 max_sectors = mddev->resync_max_sectors;
9d88883e 5096 mddev->resync_mismatches = 0;
5fd6c1dc
N		 5097 /* we don't use the checkpoint if there's a bitmap */
5098 if (!mddev->bitmap &&
5099 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5100 j = mddev->recovery_cp;
ccfcc3c1
N		 5101 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5102 max_sectors = mddev->size << 1;
5fd6c1dc 5103 else {
1da177e4
LT		 5104 /* recovery follows the physical size of devices */
5105 max_sectors = mddev->size << 1;
5fd6c1dc
N		 5106 j = MaxSector;
5107 ITERATE_RDEV(mddev,rdev,rtmp)
5108 if (rdev->raid_disk >= 0 &&
5109 !test_bit(Faulty, &rdev->flags) &&
5110 !test_bit(In_sync, &rdev->flags) &&
5111 rdev->recovery_offset < j)
5112 j = rdev->recovery_offset;
5113 }
1da177e4
LT		 5114
5115 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
5116 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
88202a0c 5117 " %d KB/sec/disc.\n", speed_min(mddev));
338cec32 5118 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
1da177e4 5119 "(but not more than %d KB/sec) for reconstruction.\n",
88202a0c 5120 speed_max(mddev));
1da177e4
LT		 5121
5122 is_mddev_idle(mddev); /* this also initializes IO event counters */
5fd6c1dc 5123
57afd89f 5124 io_sectors = 0;
1da177e4
LT		 5125 for (m = 0; m < SYNC_MARKS; m++) {
5126 mark[m] = jiffies;
57afd89f 5127 mark_cnt[m] = io_sectors;
1da177e4
LT		 5128 }
5129 last_mark = 0;
5130 mddev->resync_mark = mark[last_mark];
5131 mddev->resync_mark_cnt = mark_cnt[last_mark];
5132
5133 /*
5134 * Tune reconstruction:
5135 */
5136 window = 32*(PAGE_SIZE/512);
5137 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5138 window/2,(unsigned long long) max_sectors/2);
5139
5140 atomic_set(&mddev->recovery_active, 0);
5141 init_waitqueue_head(&mddev->recovery_wait);
5142 last_check = 0;
5143
5144 if (j>2) {
5145 printk(KERN_INFO
5146 "md: resuming recovery of %s from checkpoint.\n",
5147 mdname(mddev));
5148 mddev->curr_resync = j;
5149 }
5150
5151 while (j < max_sectors) {
57afd89f 5152 sector_t sectors;
1da177e4 5153
57afd89f
N		 5154 skipped = 0;
5155 sectors = mddev->pers->sync_request(mddev, j, &skipped,
88202a0c 5156 currspeed < speed_min(mddev));
57afd89f 5157 if (sectors == 0) {
1da177e4
LT		 5158 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5159 goto out;
5160 }
57afd89f
N		 5161
5162 if (!skipped) { /* actual IO requested */
5163 io_sectors += sectors;
5164 atomic_add(sectors, &mddev->recovery_active);
5165 }
5166
1da177e4
LT		 5167 j += sectors;
5168 if (j>1) mddev->curr_resync = j;
d7603b7e
N		 5169 if (last_check == 0)
5170 /* this is the earliers that rebuilt will be
5171 * visible in /proc/mdstat
5172 */
5173 md_new_event(mddev);
57afd89f
N		 5174
5175 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 5176 continue;
5177
57afd89f 5178 last_check = io_sectors;
1da177e4
LT		 5179
5180 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
5181 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
5182 break;
5183
5184 repeat:
5185 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5186 /* step marks */
5187 int next = (last_mark+1) % SYNC_MARKS;
5188
5189 mddev->resync_mark = mark[next];
5190 mddev->resync_mark_cnt = mark_cnt[next];
5191 mark[next] = jiffies;
57afd89f 5192 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 5193 last_mark = next;
5194 }
5195
5196
787453c2 5197 if (kthread_should_stop()) {
1da177e4
LT		 5198 /*
5199 * got a signal, exit.
5200 */
5201 printk(KERN_INFO
5202 "md: md_do_sync() got signal ... exiting\n");
1da177e4
LT		 5203 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5204 goto out;
5205 }
5206
5207 /*
5208 * this loop exits only if either when we are slower than
5209 * the 'hard' speed limit, or the system was IO-idle for
5210 * a jiffy.
5211 * the system might be non-idle CPU-wise, but we only care
5212 * about not overloading the IO subsystem. (things like an
5213 * e2fsck being done on the RAID array should execute fast)
5214 */
5215 mddev->queue->unplug_fn(mddev->queue);
5216 cond_resched();
5217
57afd89f
N		 5218 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5219 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4 5220
88202a0c
N		 5221 if (currspeed > speed_min(mddev)) {
5222 if ((currspeed > speed_max(mddev)) ||
1da177e4 5223 !is_mddev_idle(mddev)) {
c0e48521 5224 msleep(500);
1da177e4
LT		 5225 goto repeat;
5226 }
5227 }
5228 }
5229 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
5230 /*
5231 * this also signals 'finished resyncing' to md_stop
5232 */
5233 out:
5234 mddev->queue->unplug_fn(mddev->queue);
5235
5236 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5237
5238 /* tell personality that we are finished */
57afd89f 5239 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 5240
5241 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
ccfcc3c1
N		 5242 test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
5243 !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5fd6c1dc
N		 5244 mddev->curr_resync > 2) {
5245 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5246 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5247 if (mddev->curr_resync >= mddev->recovery_cp) {
5248 printk(KERN_INFO
5249 "md: checkpointing recovery of %s.\n",
5250 mdname(mddev));
5251 mddev->recovery_cp = mddev->curr_resync;
5252 }
5253 } else
5254 mddev->recovery_cp = MaxSector;
5255 } else {
5256 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5257 mddev->curr_resync = MaxSector;
5258 ITERATE_RDEV(mddev,rdev,rtmp)
5259 if (rdev->raid_disk >= 0 &&
5260 !test_bit(Faulty, &rdev->flags) &&
5261 !test_bit(In_sync, &rdev->flags) &&
5262 rdev->recovery_offset < mddev->curr_resync)
5263 rdev->recovery_offset = mddev->curr_resync;
5264 mddev->sb_dirty = 1;
5265 }
1da177e4
LT		 5266 }
5267
1da177e4
LT		 5268 skip:
5269 mddev->curr_resync = 0;
5270 wake_up(&resync_wait);
5271 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5272 md_wakeup_thread(mddev->thread);
5273}
29269553 5274EXPORT_SYMBOL_GPL(md_do_sync);
1da177e4
LT		 5275
5276
5277/*
5278 * This routine is regularly called by all per-raid-array threads to
5279 * deal with generic issues like resync and super-block update.
5280 * Raid personalities that don't have a thread (linear/raid0) do not
5281 * need this as they never do any recovery or update the superblock.
5282 *
5283 * It does not do any resync itself, but rather "forks" off other threads
5284 * to do that as needed.
5285 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5286 * "->recovery" and create a thread at ->sync_thread.
5287 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5288 * and wakeups up this thread which will reap the thread and finish up.
5289 * This thread also removes any faulty devices (with nr_pending == 0).
5290 *
5291 * The overall approach is:
5292 * 1/ if the superblock needs updating, update it.
5293 * 2/ If a recovery thread is running, don't do anything else.
5294 * 3/ If recovery has finished, clean up, possibly marking spares active.
5295 * 4/ If there are any faulty devices, remove them.
5296 * 5/ If array is degraded, try to add spares devices
5297 * 6/ If array has spares or is not in-sync, start a resync thread.
5298 */
5299void md_check_recovery(mddev_t *mddev)
5300{
5301 mdk_rdev_t *rdev;
5302 struct list_head *rtmp;
5303
5304
5f40402d
N		 5305 if (mddev->bitmap)
5306 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 5307
5308 if (mddev->ro)
5309 return;
fca4d848
N		 5310
5311 if (signal_pending(current)) {
5312 if (mddev->pers->sync_request) {
5313 printk(KERN_INFO "md: %s in immediate safe mode\n",
5314 mdname(mddev));
5315 mddev->safemode = 2;
5316 }
5317 flush_signals(current);
5318 }
5319
1da177e4
LT		 5320 if ( ! (
5321 mddev->sb_dirty ||
5322 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848
N		 5323 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
5324 (mddev->safemode == 1) ||
5325 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5326 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 5327 ))
5328 return;
fca4d848 5329
df5b89b3 5330 if (mddev_trylock(mddev)) {
1da177e4 5331 int spares =0;
fca4d848 5332
a9701a30 5333 spin_lock_irq(&mddev->write_lock);
fca4d848
N		 5334 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
5335 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
5336 mddev->in_sync = 1;
42543769 5337 mddev->sb_dirty = 3;
fca4d848
N		 5338 }
5339 if (mddev->safemode == 1)
5340 mddev->safemode = 0;
a9701a30 5341 spin_unlock_irq(&mddev->write_lock);
fca4d848 5342
1da177e4
LT		 5343 if (mddev->sb_dirty)
5344 md_update_sb(mddev);
06d91a5f 5345
06d91a5f 5346
1da177e4
LT		 5347 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
5348 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
5349 /* resync/recovery still happening */
5350 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5351 goto unlock;
5352 }
5353 if (mddev->sync_thread) {
5354 /* resync has finished, collect result */
5355 md_unregister_thread(mddev->sync_thread);
5356 mddev->sync_thread = NULL;
5357 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5358 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5359 /* success...*/
5360 /* activate any spares */
5361 mddev->pers->spare_active(mddev);
5362 }
5363 md_update_sb(mddev);
41158c7e
N		 5364
5365 /* if array is no-longer degraded, then any saved_raid_disk
5366 * information must be scrapped
5367 */
5368 if (!mddev->degraded)
5369 ITERATE_RDEV(mddev,rdev,rtmp)
5370 rdev->saved_raid_disk = -1;
5371
1da177e4
LT		 5372 mddev->recovery = 0;
5373 /* flag recovery needed just to double check */
5374 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
d7603b7e 5375 md_new_event(mddev);
1da177e4
LT		 5376 goto unlock;
5377 }
24dd469d
N		 5378 /* Clear some bits that don't mean anything, but
5379 * might be left set
5380 */
5381 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5382 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
5383 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
5384 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4 5385
5fd6c1dc
N		 5386 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5387 goto unlock;
1da177e4
LT		 5388 /* no recovery is running.
5389 * remove any failed drives, then
5390 * add spares if possible.
5391 * Spare are also removed and re-added, to allow
5392 * the personality to fail the re-add.
5393 */
5394 ITERATE_RDEV(mddev,rdev,rtmp)
5395 if (rdev->raid_disk >= 0 &&
b2d444d7 5396 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
1da177e4 5397 atomic_read(&rdev->nr_pending)==0) {
86e6ffdd
N		 5398 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
5399 char nm[20];
5400 sprintf(nm,"rd%d", rdev->raid_disk);
5401 sysfs_remove_link(&mddev->kobj, nm);
1da177e4 5402 rdev->raid_disk = -1;
86e6ffdd 5403 }
1da177e4
LT		 5404 }
5405
5406 if (mddev->degraded) {
5407 ITERATE_RDEV(mddev,rdev,rtmp)
5408 if (rdev->raid_disk < 0
b2d444d7 5409 && !test_bit(Faulty, &rdev->flags)) {
5fd6c1dc 5410 rdev->recovery_offset = 0;
86e6ffdd
N		 5411 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5412 char nm[20];
5413 sprintf(nm, "rd%d", rdev->raid_disk);
5414 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
1da177e4 5415 spares++;
d7603b7e 5416 md_new_event(mddev);
86e6ffdd 5417 } else
1da177e4
LT		 5418 break;
5419 }
5420 }
5421
24dd469d
N		 5422 if (spares) {
5423 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5424 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5425 } else if (mddev->recovery_cp < MaxSector) {
5426 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5427 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5428 /* nothing to be done ... */
1da177e4 5429 goto unlock;
24dd469d 5430
1da177e4
LT		 5431 if (mddev->pers->sync_request) {
5432 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 5433 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
5434 /* We are adding a device or devices to an array
5435 * which has the bitmap stored on all devices.
5436 * So make sure all bitmap pages get written
5437 */
5438 bitmap_write_all(mddev->bitmap);
5439 }
1da177e4
LT		 5440 mddev->sync_thread = md_register_thread(md_do_sync,
5441 mddev,
5442 "%s_resync");
5443 if (!mddev->sync_thread) {
5444 printk(KERN_ERR "%s: could not start resync"
5445 " thread...\n",
5446 mdname(mddev));
5447 /* leave the spares where they are, it shouldn't hurt */
5448 mddev->recovery = 0;
d7603b7e 5449 } else
1da177e4 5450 md_wakeup_thread(mddev->sync_thread);
d7603b7e 5451 md_new_event(mddev);
1da177e4
LT		 5452 }
5453 unlock:
5454 mddev_unlock(mddev);
5455 }
5456}
5457
75c96f85
AB		 5458static int md_notify_reboot(struct notifier_block *this,
5459 unsigned long code, void *x)
1da177e4
LT		 5460{
5461 struct list_head *tmp;
5462 mddev_t *mddev;
5463
5464 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
5465
5466 printk(KERN_INFO "md: stopping all md devices.\n");
5467
5468 ITERATE_MDDEV(mddev,tmp)
c71d4887 5469 if (mddev_trylock(mddev)) {
1da177e4 5470 do_md_stop (mddev, 1);
c71d4887
NB		 5471 mddev_unlock(mddev);
5472 }
1da177e4
LT		 5473 /*
5474 * certain more exotic SCSI devices are known to be
5475 * volatile wrt too early system reboots. While the
5476 * right place to handle this issue is the given
5477 * driver, we do want to have a safe RAID driver ...
5478 */
5479 mdelay(1000*1);
5480 }
5481 return NOTIFY_DONE;
5482}
5483
75c96f85 5484static struct notifier_block md_notifier = {
1da177e4
LT		 5485 .notifier_call = md_notify_reboot,
5486 .next = NULL,
5487 .priority = INT_MAX, /* before any real devices */
5488};
5489
5490static void md_geninit(void)
5491{
5492 struct proc_dir_entry *p;
5493
5494 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5495
5496 p = create_proc_entry("mdstat", S_IRUGO, NULL);
5497 if (p)
5498 p->proc_fops = &md_seq_fops;
5499}
5500
75c96f85 5501static int __init md_init(void)
1da177e4
LT		 5502{
5503 int minor;
5504
5505 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
5506 " MD_SB_DISKS=%d\n",
5507 MD_MAJOR_VERSION, MD_MINOR_VERSION,
5508 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
bd926c63 5509 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
32a7627c 5510 BITMAP_MINOR);
1da177e4
LT		 5511
5512 if (register_blkdev(MAJOR_NR, "md"))
5513 return -1;
5514 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
5515 unregister_blkdev(MAJOR_NR, "md");
5516 return -1;
5517 }
5518 devfs_mk_dir("md");
5519 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
5520 md_probe, NULL, NULL);
5521 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
5522 md_probe, NULL, NULL);
5523
5524 for (minor=0; minor < MAX_MD_DEVS; ++minor)
5525 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
5526 S_IFBLK|S_IRUSR|S_IWUSR,
5527 "md/%d", minor);
5528
5529 for (minor=0; minor < MAX_MD_DEVS; ++minor)
5530 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
5531 S_IFBLK|S_IRUSR|S_IWUSR,
5532 "md/mdp%d", minor);
5533
5534
5535 register_reboot_notifier(&md_notifier);
5536 raid_table_header = register_sysctl_table(raid_root_table, 1);
5537
5538 md_geninit();
5539 return (0);
5540}
5541
5542
5543#ifndef MODULE
5544
5545/*
5546 * Searches all registered partitions for autorun RAID arrays
5547 * at boot time.
5548 */
5549static dev_t detected_devices[128];
5550static int dev_cnt;
5551
5552void md_autodetect_dev(dev_t dev)
5553{
5554 if (dev_cnt >= 0 && dev_cnt < 127)
5555 detected_devices[dev_cnt++] = dev;
5556}
5557
5558
5559static void autostart_arrays(int part)
5560{
5561 mdk_rdev_t *rdev;
5562 int i;
5563
5564 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
5565
5566 for (i = 0; i < dev_cnt; i++) {
5567 dev_t dev = detected_devices[i];
5568
5569 rdev = md_import_device(dev,0, 0);
5570 if (IS_ERR(rdev))
5571 continue;
5572
b2d444d7 5573 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 5574 MD_BUG();
5575 continue;
5576 }
5577 list_add(&rdev->same_set, &pending_raid_disks);
5578 }
5579 dev_cnt = 0;
5580
5581 autorun_devices(part);
5582}
5583
5584#endif
5585
5586static __exit void md_exit(void)
5587{
5588 mddev_t *mddev;
5589 struct list_head *tmp;
5590 int i;
5591 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
5592 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
5593 for (i=0; i < MAX_MD_DEVS; i++)
5594 devfs_remove("md/%d", i);
5595 for (i=0; i < MAX_MD_DEVS; i++)
5596 devfs_remove("md/d%d", i);
5597
5598 devfs_remove("md");
5599
5600 unregister_blkdev(MAJOR_NR,"md");
5601 unregister_blkdev(mdp_major, "mdp");
5602 unregister_reboot_notifier(&md_notifier);
5603 unregister_sysctl_table(raid_table_header);
5604 remove_proc_entry("mdstat", NULL);
5605 ITERATE_MDDEV(mddev,tmp) {
5606 struct gendisk *disk = mddev->gendisk;
5607 if (!disk)
5608 continue;
5609 export_array(mddev);
5610 del_gendisk(disk);
5611 put_disk(disk);
5612 mddev->gendisk = NULL;
5613 mddev_put(mddev);
5614 }
5615}
5616
5617module_init(md_init)
5618module_exit(md_exit)
5619
f91de92e
N		 5620static int get_ro(char *buffer, struct kernel_param *kp)
5621{
5622 return sprintf(buffer, "%d", start_readonly);
5623}
5624static int set_ro(const char *val, struct kernel_param *kp)
5625{
5626 char *e;
5627 int num = simple_strtoul(val, &e, 10);
5628 if (*val && (*e == '\0' || *e == '\n')) {
5629 start_readonly = num;
4dbcdc75 5630 return 0;
f91de92e
N		 5631 }
5632 return -EINVAL;
5633}
5634
5635module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
6ff8d8ec
N		 5636module_param(start_dirty_degraded, int, 0644);
5637
f91de92e 5638
1da177e4
LT		 5639EXPORT_SYMBOL(register_md_personality);
5640EXPORT_SYMBOL(unregister_md_personality);
5641EXPORT_SYMBOL(md_error);
5642EXPORT_SYMBOL(md_done_sync);
5643EXPORT_SYMBOL(md_write_start);
5644EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 5645EXPORT_SYMBOL(md_register_thread);
5646EXPORT_SYMBOL(md_unregister_thread);
5647EXPORT_SYMBOL(md_wakeup_thread);
1da177e4
LT		 5648EXPORT_SYMBOL(md_check_recovery);
5649MODULE_LICENSE("GPL");
aa1595e9 5650MODULE_ALIAS("md");
72008652 5651MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
Linux 6.x block layer and io_uring tree(s)