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[PATCH] md: fix duplicity of levels in md.txt
[linux.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 <[email protected]>
11 - boot support for linear and striped mode by Harald Hoyer <[email protected]>
12 - kerneld support by Boris Tobotras <[email protected]>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <[email protected]>
15 - Devfs support by Richard Gooch <[email protected]>
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 <[email protected]>.
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>
a6fb0934 36#include <linux/kthread.h>
1da177e4
LT		 37#include <linux/linkage.h>
38#include <linux/raid/md.h>
32a7627c 39#include <linux/raid/bitmap.h>
1da177e4 40#include <linux/sysctl.h>
1da177e4
LT		 41#include <linux/buffer_head.h> /* for invalidate_bdev */
42#include <linux/suspend.h>
d7603b7e 43#include <linux/poll.h>
48c9c27b 44#include <linux/mutex.h>
16f17b39 45#include <linux/ctype.h>
1da177e4
LT		 46
47#include <linux/init.h>
48
32a7627c
N		 49#include <linux/file.h>
50
1da177e4
LT		 51#ifdef CONFIG_KMOD
52#include <linux/kmod.h>
53#endif
54
55#include <asm/unaligned.h>
56
57#define MAJOR_NR MD_MAJOR
58#define MD_DRIVER
59
60/* 63 partitions with the alternate major number (mdp) */
61#define MdpMinorShift 6
62
63#define DEBUG 0
64#define dprintk(x...) ((void)(DEBUG && printk(x)))
65
66
67#ifndef MODULE
68static void autostart_arrays (int part);
69#endif
70
2604b703 71static LIST_HEAD(pers_list);
1da177e4
LT		 72static DEFINE_SPINLOCK(pers_lock);
73
5e56341d
AB		 74static void md_print_devices(void);
75
76#define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
77
1da177e4
LT		 78/*
79 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
80 * is 1000 KB/sec, so the extra system load does not show up that much.
81 * Increase it if you want to have more _guaranteed_ speed. Note that
338cec32 82 * the RAID driver will use the maximum available bandwidth if the IO
1da177e4
LT		 83 * subsystem is idle. There is also an 'absolute maximum' reconstruction
84 * speed limit - in case reconstruction slows down your system despite
85 * idle IO detection.
86 *
87 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
88202a0c 88 * or /sys/block/mdX/md/sync_speed_{min,max}
1da177e4
LT		 89 */
90
91static int sysctl_speed_limit_min = 1000;
92static int sysctl_speed_limit_max = 200000;
88202a0c
N		 93static inline int speed_min(mddev_t *mddev)
94{
95 return mddev->sync_speed_min ?
96 mddev->sync_speed_min : sysctl_speed_limit_min;
97}
98
99static inline int speed_max(mddev_t *mddev)
100{
101 return mddev->sync_speed_max ?
102 mddev->sync_speed_max : sysctl_speed_limit_max;
103}
1da177e4
LT		 104
105static struct ctl_table_header *raid_table_header;
106
107static ctl_table raid_table[] = {
108 {
109 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
110 .procname = "speed_limit_min",
111 .data = &sysctl_speed_limit_min,
112 .maxlen = sizeof(int),
80ca3a44 113 .mode = S_IRUGO|S_IWUSR,
1da177e4
LT		 114 .proc_handler = &proc_dointvec,
115 },
116 {
117 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
118 .procname = "speed_limit_max",
119 .data = &sysctl_speed_limit_max,
120 .maxlen = sizeof(int),
80ca3a44 121 .mode = S_IRUGO|S_IWUSR,
1da177e4
LT		 122 .proc_handler = &proc_dointvec,
123 },
124 { .ctl_name = 0 }
125};
126
127static ctl_table raid_dir_table[] = {
128 {
129 .ctl_name = DEV_RAID,
130 .procname = "raid",
131 .maxlen = 0,
80ca3a44 132 .mode = S_IRUGO|S_IXUGO,
1da177e4
LT		 133 .child = raid_table,
134 },
135 { .ctl_name = 0 }
136};
137
138static ctl_table raid_root_table[] = {
139 {
140 .ctl_name = CTL_DEV,
141 .procname = "dev",
142 .maxlen = 0,
143 .mode = 0555,
144 .child = raid_dir_table,
145 },
146 { .ctl_name = 0 }
147};
148
149static struct block_device_operations md_fops;
150
f91de92e
N		 151static int start_readonly;
152
d7603b7e
N		 153/*
154 * We have a system wide 'event count' that is incremented
155 * on any 'interesting' event, and readers of /proc/mdstat
156 * can use 'poll' or 'select' to find out when the event
157 * count increases.
158 *
159 * Events are:
160 * start array, stop array, error, add device, remove device,
161 * start build, activate spare
162 */
2989ddbd 163static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
d7603b7e 164static atomic_t md_event_count;
29269553 165void md_new_event(mddev_t *mddev)
d7603b7e
N		 166{
167 atomic_inc(&md_event_count);
168 wake_up(&md_event_waiters);
4508a7a7 169 sysfs_notify(&mddev->kobj, NULL, "sync_action");
d7603b7e 170}
29269553 171EXPORT_SYMBOL_GPL(md_new_event);
d7603b7e 172
c331eb04
N		 173/* Alternate version that can be called from interrupts
174 * when calling sysfs_notify isn't needed.
175 */
05381954 176static void md_new_event_inintr(mddev_t *mddev)
c331eb04
N		 177{
178 atomic_inc(&md_event_count);
179 wake_up(&md_event_waiters);
180}
181
1da177e4
LT		 182/*
183 * Enables to iterate over all existing md arrays
184 * all_mddevs_lock protects this list.
185 */
186static LIST_HEAD(all_mddevs);
187static DEFINE_SPINLOCK(all_mddevs_lock);
188
189
190/*
191 * iterates through all used mddevs in the system.
192 * We take care to grab the all_mddevs_lock whenever navigating
193 * the list, and to always hold a refcount when unlocked.
194 * Any code which breaks out of this loop while own
195 * a reference to the current mddev and must mddev_put it.
196 */
197#define ITERATE_MDDEV(mddev,tmp) \
198 \
199 for (({ spin_lock(&all_mddevs_lock); \
200 tmp = all_mddevs.next; \
201 mddev = NULL;}); \
202 ({ if (tmp != &all_mddevs) \
203 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
204 spin_unlock(&all_mddevs_lock); \
205 if (mddev) mddev_put(mddev); \
206 mddev = list_entry(tmp, mddev_t, all_mddevs); \
207 tmp != &all_mddevs;}); \
208 ({ spin_lock(&all_mddevs_lock); \
209 tmp = tmp->next;}) \
210 )
211
212
213static int md_fail_request (request_queue_t *q, struct bio *bio)
214{
215 bio_io_error(bio, bio->bi_size);
216 return 0;
217}
218
219static inline mddev_t *mddev_get(mddev_t *mddev)
220{
221 atomic_inc(&mddev->active);
222 return mddev;
223}
224
225static void mddev_put(mddev_t *mddev)
226{
227 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
228 return;
229 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
230 list_del(&mddev->all_mddevs);
926ce2d8 231 spin_unlock(&all_mddevs_lock);
1312f40e 232 blk_cleanup_queue(mddev->queue);
eae1701f 233 kobject_unregister(&mddev->kobj);
926ce2d8
N		 234 } else
235 spin_unlock(&all_mddevs_lock);
1da177e4
LT		 236}
237
238static mddev_t * mddev_find(dev_t unit)
239{
240 mddev_t *mddev, *new = NULL;
241
242 retry:
243 spin_lock(&all_mddevs_lock);
244 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
245 if (mddev->unit == unit) {
246 mddev_get(mddev);
247 spin_unlock(&all_mddevs_lock);
990a8baf 248 kfree(new);
1da177e4
LT		 249 return mddev;
250 }
251
252 if (new) {
253 list_add(&new->all_mddevs, &all_mddevs);
254 spin_unlock(&all_mddevs_lock);
255 return new;
256 }
257 spin_unlock(&all_mddevs_lock);
258
9ffae0cf 259 new = kzalloc(sizeof(*new), GFP_KERNEL);
1da177e4
LT		 260 if (!new)
261 return NULL;
262
1da177e4
LT		 263 new->unit = unit;
264 if (MAJOR(unit) == MD_MAJOR)
265 new->md_minor = MINOR(unit);
266 else
267 new->md_minor = MINOR(unit) >> MdpMinorShift;
268
df5b89b3 269 mutex_init(&new->reconfig_mutex);
1da177e4
LT		 270 INIT_LIST_HEAD(&new->disks);
271 INIT_LIST_HEAD(&new->all_mddevs);
272 init_timer(&new->safemode_timer);
273 atomic_set(&new->active, 1);
06d91a5f 274 spin_lock_init(&new->write_lock);
3d310eb7 275 init_waitqueue_head(&new->sb_wait);
1da177e4
LT		 276
277 new->queue = blk_alloc_queue(GFP_KERNEL);
278 if (!new->queue) {
279 kfree(new);
280 return NULL;
281 }
89e5c8b5 282 set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags);
1da177e4
LT		 283
284 blk_queue_make_request(new->queue, md_fail_request);
285
286 goto retry;
287}
288
289static inline int mddev_lock(mddev_t * mddev)
290{
df5b89b3 291 return mutex_lock_interruptible(&mddev->reconfig_mutex);
1da177e4
LT		 292}
293
1da177e4
LT		 294static inline int mddev_trylock(mddev_t * mddev)
295{
df5b89b3 296 return mutex_trylock(&mddev->reconfig_mutex);
1da177e4
LT		 297}
298
299static inline void mddev_unlock(mddev_t * mddev)
300{
df5b89b3 301 mutex_unlock(&mddev->reconfig_mutex);
1da177e4 302
005eca5e 303 md_wakeup_thread(mddev->thread);
1da177e4
LT		 304}
305
2989ddbd 306static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
1da177e4
LT		 307{
308 mdk_rdev_t * rdev;
309 struct list_head *tmp;
310
311 ITERATE_RDEV(mddev,rdev,tmp) {
312 if (rdev->desc_nr == nr)
313 return rdev;
314 }
315 return NULL;
316}
317
318static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
319{
320 struct list_head *tmp;
321 mdk_rdev_t *rdev;
322
323 ITERATE_RDEV(mddev,rdev,tmp) {
324 if (rdev->bdev->bd_dev == dev)
325 return rdev;
326 }
327 return NULL;
328}
329
d9d166c2 330static struct mdk_personality *find_pers(int level, char *clevel)
2604b703
N		 331{
332 struct mdk_personality *pers;
d9d166c2
N		 333 list_for_each_entry(pers, &pers_list, list) {
334 if (level != LEVEL_NONE && pers->level == level)
2604b703 335 return pers;
d9d166c2
N		 336 if (strcmp(pers->name, clevel)==0)
337 return pers;
338 }
2604b703
N		 339 return NULL;
340}
341
77933d72 342static inline sector_t calc_dev_sboffset(struct block_device *bdev)
1da177e4
LT		 343{
344 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
345 return MD_NEW_SIZE_BLOCKS(size);
346}
347
348static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
349{
350 sector_t size;
351
352 size = rdev->sb_offset;
353
354 if (chunk_size)
355 size &= ~((sector_t)chunk_size/1024 - 1);
356 return size;
357}
358
359static int alloc_disk_sb(mdk_rdev_t * rdev)
360{
361 if (rdev->sb_page)
362 MD_BUG();
363
364 rdev->sb_page = alloc_page(GFP_KERNEL);
365 if (!rdev->sb_page) {
366 printk(KERN_ALERT "md: out of memory.\n");
367 return -EINVAL;
368 }
369
370 return 0;
371}
372
373static void free_disk_sb(mdk_rdev_t * rdev)
374{
375 if (rdev->sb_page) {
2d1f3b5d 376 put_page(rdev->sb_page);
1da177e4
LT		 377 rdev->sb_loaded = 0;
378 rdev->sb_page = NULL;
379 rdev->sb_offset = 0;
380 rdev->size = 0;
381 }
382}
383
384
7bfa19f2
N		 385static int super_written(struct bio *bio, unsigned int bytes_done, int error)
386{
387 mdk_rdev_t *rdev = bio->bi_private;
a9701a30 388 mddev_t *mddev = rdev->mddev;
7bfa19f2
N		 389 if (bio->bi_size)
390 return 1;
391
392 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags))
a9701a30 393 md_error(mddev, rdev);
7bfa19f2 394
a9701a30
N		 395 if (atomic_dec_and_test(&mddev->pending_writes))
396 wake_up(&mddev->sb_wait);
f8b58edf 397 bio_put(bio);
7bfa19f2
N		 398 return 0;
399}
400
a9701a30
N		 401static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
402{
403 struct bio *bio2 = bio->bi_private;
404 mdk_rdev_t *rdev = bio2->bi_private;
405 mddev_t *mddev = rdev->mddev;
406 if (bio->bi_size)
407 return 1;
408
409 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
410 error == -EOPNOTSUPP) {
411 unsigned long flags;
412 /* barriers don't appear to be supported :-( */
413 set_bit(BarriersNotsupp, &rdev->flags);
414 mddev->barriers_work = 0;
415 spin_lock_irqsave(&mddev->write_lock, flags);
416 bio2->bi_next = mddev->biolist;
417 mddev->biolist = bio2;
418 spin_unlock_irqrestore(&mddev->write_lock, flags);
419 wake_up(&mddev->sb_wait);
420 bio_put(bio);
421 return 0;
422 }
423 bio_put(bio2);
424 bio->bi_private = rdev;
425 return super_written(bio, bytes_done, error);
426}
427
7bfa19f2
N		 428void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
429 sector_t sector, int size, struct page *page)
430{
431 /* write first size bytes of page to sector of rdev
432 * Increment mddev->pending_writes before returning
433 * and decrement it on completion, waking up sb_wait
434 * if zero is reached.
435 * If an error occurred, call md_error
a9701a30
N		 436 *
437 * As we might need to resubmit the request if BIO_RW_BARRIER
438 * causes ENOTSUPP, we allocate a spare bio...
7bfa19f2
N		 439 */
440 struct bio *bio = bio_alloc(GFP_NOIO, 1);
a9701a30 441 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
7bfa19f2
N		 442
443 bio->bi_bdev = rdev->bdev;
444 bio->bi_sector = sector;
445 bio_add_page(bio, page, size, 0);
446 bio->bi_private = rdev;
447 bio->bi_end_io = super_written;
a9701a30
N		 448 bio->bi_rw = rw;
449
7bfa19f2 450 atomic_inc(&mddev->pending_writes);
a9701a30
N		 451 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
452 struct bio *rbio;
453 rw |= (1<<BIO_RW_BARRIER);
454 rbio = bio_clone(bio, GFP_NOIO);
455 rbio->bi_private = bio;
456 rbio->bi_end_io = super_written_barrier;
457 submit_bio(rw, rbio);
458 } else
459 submit_bio(rw, bio);
460}
461
462void md_super_wait(mddev_t *mddev)
463{
464 /* wait for all superblock writes that were scheduled to complete.
465 * if any had to be retried (due to BARRIER problems), retry them
466 */
467 DEFINE_WAIT(wq);
468 for(;;) {
469 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
470 if (atomic_read(&mddev->pending_writes)==0)
471 break;
472 while (mddev->biolist) {
473 struct bio *bio;
474 spin_lock_irq(&mddev->write_lock);
475 bio = mddev->biolist;
476 mddev->biolist = bio->bi_next ;
477 bio->bi_next = NULL;
478 spin_unlock_irq(&mddev->write_lock);
479 submit_bio(bio->bi_rw, bio);
480 }
481 schedule();
482 }
483 finish_wait(&mddev->sb_wait, &wq);
7bfa19f2
N		 484}
485
1da177e4
LT		 486static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
487{
488 if (bio->bi_size)
489 return 1;
490
491 complete((struct completion*)bio->bi_private);
492 return 0;
493}
494
a654b9d8 495int sync_page_io(struct block_device *bdev, sector_t sector, int size,
1da177e4
LT		 496 struct page *page, int rw)
497{
baaa2c51 498 struct bio *bio = bio_alloc(GFP_NOIO, 1);
1da177e4
LT		 499 struct completion event;
500 int ret;
501
502 rw |= (1 << BIO_RW_SYNC);
503
504 bio->bi_bdev = bdev;
505 bio->bi_sector = sector;
506 bio_add_page(bio, page, size, 0);
507 init_completion(&event);
508 bio->bi_private = &event;
509 bio->bi_end_io = bi_complete;
510 submit_bio(rw, bio);
511 wait_for_completion(&event);
512
513 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
514 bio_put(bio);
515 return ret;
516}
a8745db2 517EXPORT_SYMBOL_GPL(sync_page_io);
1da177e4 518
0002b271 519static int read_disk_sb(mdk_rdev_t * rdev, int size)
1da177e4
LT		 520{
521 char b[BDEVNAME_SIZE];
522 if (!rdev->sb_page) {
523 MD_BUG();
524 return -EINVAL;
525 }
526 if (rdev->sb_loaded)
527 return 0;
528
529
0002b271 530 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
1da177e4
LT		 531 goto fail;
532 rdev->sb_loaded = 1;
533 return 0;
534
535fail:
536 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
537 bdevname(rdev->bdev,b));
538 return -EINVAL;
539}
540
541static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
542{
543 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
544 (sb1->set_uuid1 == sb2->set_uuid1) &&
545 (sb1->set_uuid2 == sb2->set_uuid2) &&
546 (sb1->set_uuid3 == sb2->set_uuid3))
547
548 return 1;
549
550 return 0;
551}
552
553
554static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
555{
556 int ret;
557 mdp_super_t *tmp1, *tmp2;
558
559 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
560 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
561
562 if (!tmp1 || !tmp2) {
563 ret = 0;
564 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
565 goto abort;
566 }
567
568 *tmp1 = *sb1;
569 *tmp2 = *sb2;
570
571 /*
572 * nr_disks is not constant
573 */
574 tmp1->nr_disks = 0;
575 tmp2->nr_disks = 0;
576
577 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
578 ret = 0;
579 else
580 ret = 1;
581
582abort:
990a8baf
JJ		 583 kfree(tmp1);
584 kfree(tmp2);
1da177e4
LT		 585 return ret;
586}
587
588static unsigned int calc_sb_csum(mdp_super_t * sb)
589{
590 unsigned int disk_csum, csum;
591
592 disk_csum = sb->sb_csum;
593 sb->sb_csum = 0;
594 csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
595 sb->sb_csum = disk_csum;
596 return csum;
597}
598
599
600/*
601 * Handle superblock details.
602 * We want to be able to handle multiple superblock formats
603 * so we have a common interface to them all, and an array of
604 * different handlers.
605 * We rely on user-space to write the initial superblock, and support
606 * reading and updating of superblocks.
607 * Interface methods are:
608 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
609 * loads and validates a superblock on dev.
610 * if refdev != NULL, compare superblocks on both devices
611 * Return:
612 * 0 - dev has a superblock that is compatible with refdev
613 * 1 - dev has a superblock that is compatible and newer than refdev
614 * so dev should be used as the refdev in future
615 * -EINVAL superblock incompatible or invalid
616 * -othererror e.g. -EIO
617 *
618 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
619 * Verify that dev is acceptable into mddev.
620 * The first time, mddev->raid_disks will be 0, and data from
621 * dev should be merged in. Subsequent calls check that dev
622 * is new enough. Return 0 or -EINVAL
623 *
624 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
625 * Update the superblock for rdev with data in mddev
626 * This does not write to disc.
627 *
628 */
629
630struct super_type {
631 char *name;
632 struct module *owner;
633 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
634 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
635 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
636};
637
638/*
639 * load_super for 0.90.0
640 */
641static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
642{
643 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
644 mdp_super_t *sb;
645 int ret;
646 sector_t sb_offset;
647
648 /*
649 * Calculate the position of the superblock,
650 * it's at the end of the disk.
651 *
652 * It also happens to be a multiple of 4Kb.
653 */
654 sb_offset = calc_dev_sboffset(rdev->bdev);
655 rdev->sb_offset = sb_offset;
656
0002b271 657 ret = read_disk_sb(rdev, MD_SB_BYTES);
1da177e4
LT		 658 if (ret) return ret;
659
660 ret = -EINVAL;
661
662 bdevname(rdev->bdev, b);
663 sb = (mdp_super_t*)page_address(rdev->sb_page);
664
665 if (sb->md_magic != MD_SB_MAGIC) {
666 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
667 b);
668 goto abort;
669 }
670
671 if (sb->major_version != 0 ||
f6705578
N		 672 sb->minor_version < 90 ||
673 sb->minor_version > 91) {
1da177e4
LT		 674 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
675 sb->major_version, sb->minor_version,
676 b);
677 goto abort;
678 }
679
680 if (sb->raid_disks <= 0)
681 goto abort;
682
683 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
684 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
685 b);
686 goto abort;
687 }
688
689 rdev->preferred_minor = sb->md_minor;
690 rdev->data_offset = 0;
0002b271 691 rdev->sb_size = MD_SB_BYTES;
1da177e4
LT		 692
693 if (sb->level == LEVEL_MULTIPATH)
694 rdev->desc_nr = -1;
695 else
696 rdev->desc_nr = sb->this_disk.number;
697
698 if (refdev == 0)
699 ret = 1;
700 else {
701 __u64 ev1, ev2;
702 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
703 if (!uuid_equal(refsb, sb)) {
704 printk(KERN_WARNING "md: %s has different UUID to %s\n",
705 b, bdevname(refdev->bdev,b2));
706 goto abort;
707 }
708 if (!sb_equal(refsb, sb)) {
709 printk(KERN_WARNING "md: %s has same UUID"
710 " but different superblock to %s\n",
711 b, bdevname(refdev->bdev, b2));
712 goto abort;
713 }
714 ev1 = md_event(sb);
715 ev2 = md_event(refsb);
716 if (ev1 > ev2)
717 ret = 1;
718 else
719 ret = 0;
720 }
721 rdev->size = calc_dev_size(rdev, sb->chunk_size);
722
2bf071bf
N		 723 if (rdev->size < sb->size && sb->level > 1)
724 /* "this cannot possibly happen" ... */
725 ret = -EINVAL;
726
1da177e4
LT		 727 abort:
728 return ret;
729}
730
731/*
732 * validate_super for 0.90.0
733 */
734static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
735{
736 mdp_disk_t *desc;
737 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
07d84d10 738 __u64 ev1 = md_event(sb);
1da177e4 739
41158c7e 740 rdev->raid_disk = -1;
b2d444d7 741 rdev->flags = 0;
1da177e4
LT		 742 if (mddev->raid_disks == 0) {
743 mddev->major_version = 0;
744 mddev->minor_version = sb->minor_version;
745 mddev->patch_version = sb->patch_version;
746 mddev->persistent = ! sb->not_persistent;
747 mddev->chunk_size = sb->chunk_size;
748 mddev->ctime = sb->ctime;
749 mddev->utime = sb->utime;
750 mddev->level = sb->level;
d9d166c2 751 mddev->clevel[0] = 0;
1da177e4
LT		 752 mddev->layout = sb->layout;
753 mddev->raid_disks = sb->raid_disks;
754 mddev->size = sb->size;
07d84d10 755 mddev->events = ev1;
9223214e 756 mddev->bitmap_offset = 0;
36fa3063 757 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
1da177e4 758
f6705578
N		 759 if (mddev->minor_version >= 91) {
760 mddev->reshape_position = sb->reshape_position;
761 mddev->delta_disks = sb->delta_disks;
762 mddev->new_level = sb->new_level;
763 mddev->new_layout = sb->new_layout;
764 mddev->new_chunk = sb->new_chunk;
765 } else {
766 mddev->reshape_position = MaxSector;
767 mddev->delta_disks = 0;
768 mddev->new_level = mddev->level;
769 mddev->new_layout = mddev->layout;
770 mddev->new_chunk = mddev->chunk_size;
771 }
772
1da177e4
LT		 773 if (sb->state & (1<<MD_SB_CLEAN))
774 mddev->recovery_cp = MaxSector;
775 else {
776 if (sb->events_hi == sb->cp_events_hi &&
777 sb->events_lo == sb->cp_events_lo) {
778 mddev->recovery_cp = sb->recovery_cp;
779 } else
780 mddev->recovery_cp = 0;
781 }
782
783 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
784 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
785 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
786 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
787
788 mddev->max_disks = MD_SB_DISKS;
a654b9d8
N		 789
790 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
791 mddev->bitmap_file == NULL) {
c5a10f62
N		 792 if (mddev->level != 1 && mddev->level != 4
793 && mddev->level != 5 && mddev->level != 6
6cce3b23 794 && mddev->level != 10) {
a654b9d8 795 /* FIXME use a better test */
6cce3b23 796 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
a654b9d8
N		 797 return -EINVAL;
798 }
36fa3063 799 mddev->bitmap_offset = mddev->default_bitmap_offset;
a654b9d8
N		 800 }
801
41158c7e
N		 802 } else if (mddev->pers == NULL) {
803 /* Insist on good event counter while assembling */
1da177e4
LT		 804 ++ev1;
805 if (ev1 < mddev->events)
806 return -EINVAL;
41158c7e
N		 807 } else if (mddev->bitmap) {
808 /* if adding to array with a bitmap, then we can accept an
809 * older device ... but not too old.
810 */
41158c7e
N		 811 if (ev1 < mddev->bitmap->events_cleared)
812 return 0;
07d84d10
N		 813 } else {
814 if (ev1 < mddev->events)
815 /* just a hot-add of a new device, leave raid_disk at -1 */
816 return 0;
817 }
41158c7e 818
1da177e4 819 if (mddev->level != LEVEL_MULTIPATH) {
1da177e4
LT		 820 desc = sb->disks + rdev->desc_nr;
821
822 if (desc->state & (1<<MD_DISK_FAULTY))
b2d444d7 823 set_bit(Faulty, &rdev->flags);
7c7546cc
N		 824 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
825 desc->raid_disk < mddev->raid_disks */) {
b2d444d7 826 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 827 rdev->raid_disk = desc->raid_disk;
828 }
8ddf9efe
N		 829 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
830 set_bit(WriteMostly, &rdev->flags);
41158c7e 831 } else /* MULTIPATH are always insync */
b2d444d7 832 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 833 return 0;
834}
835
836/*
837 * sync_super for 0.90.0
838 */
839static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
840{
841 mdp_super_t *sb;
842 struct list_head *tmp;
843 mdk_rdev_t *rdev2;
844 int next_spare = mddev->raid_disks;
19133a42 845
1da177e4
LT		 846
847 /* make rdev->sb match mddev data..
848 *
849 * 1/ zero out disks
850 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
851 * 3/ any empty disks < next_spare become removed
852 *
853 * disks[0] gets initialised to REMOVED because
854 * we cannot be sure from other fields if it has
855 * been initialised or not.
856 */
857 int i;
858 int active=0, working=0,failed=0,spare=0,nr_disks=0;
859
61181565
N		 860 rdev->sb_size = MD_SB_BYTES;
861
1da177e4
LT		 862 sb = (mdp_super_t*)page_address(rdev->sb_page);
863
864 memset(sb, 0, sizeof(*sb));
865
866 sb->md_magic = MD_SB_MAGIC;
867 sb->major_version = mddev->major_version;
1da177e4
LT		 868 sb->patch_version = mddev->patch_version;
869 sb->gvalid_words = 0; /* ignored */
870 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
871 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
872 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
873 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
874
875 sb->ctime = mddev->ctime;
876 sb->level = mddev->level;
877 sb->size = mddev->size;
878 sb->raid_disks = mddev->raid_disks;
879 sb->md_minor = mddev->md_minor;
880 sb->not_persistent = !mddev->persistent;
881 sb->utime = mddev->utime;
882 sb->state = 0;
883 sb->events_hi = (mddev->events>>32);
884 sb->events_lo = (u32)mddev->events;
885
f6705578
N		 886 if (mddev->reshape_position == MaxSector)
887 sb->minor_version = 90;
888 else {
889 sb->minor_version = 91;
890 sb->reshape_position = mddev->reshape_position;
891 sb->new_level = mddev->new_level;
892 sb->delta_disks = mddev->delta_disks;
893 sb->new_layout = mddev->new_layout;
894 sb->new_chunk = mddev->new_chunk;
895 }
896 mddev->minor_version = sb->minor_version;
1da177e4
LT		 897 if (mddev->in_sync)
898 {
899 sb->recovery_cp = mddev->recovery_cp;
900 sb->cp_events_hi = (mddev->events>>32);
901 sb->cp_events_lo = (u32)mddev->events;
902 if (mddev->recovery_cp == MaxSector)
903 sb->state = (1<< MD_SB_CLEAN);
904 } else
905 sb->recovery_cp = 0;
906
907 sb->layout = mddev->layout;
908 sb->chunk_size = mddev->chunk_size;
909
a654b9d8
N		 910 if (mddev->bitmap && mddev->bitmap_file == NULL)
911 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
912
1da177e4
LT		 913 sb->disks[0].state = (1<<MD_DISK_REMOVED);
914 ITERATE_RDEV(mddev,rdev2,tmp) {
915 mdp_disk_t *d;
86e6ffdd 916 int desc_nr;
b2d444d7
N		 917 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
918 && !test_bit(Faulty, &rdev2->flags))
86e6ffdd 919 desc_nr = rdev2->raid_disk;
1da177e4 920 else
86e6ffdd 921 desc_nr = next_spare++;
19133a42 922 rdev2->desc_nr = desc_nr;
1da177e4
LT		 923 d = &sb->disks[rdev2->desc_nr];
924 nr_disks++;
925 d->number = rdev2->desc_nr;
926 d->major = MAJOR(rdev2->bdev->bd_dev);
927 d->minor = MINOR(rdev2->bdev->bd_dev);
b2d444d7
N		 928 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
929 && !test_bit(Faulty, &rdev2->flags))
1da177e4
LT		 930 d->raid_disk = rdev2->raid_disk;
931 else
932 d->raid_disk = rdev2->desc_nr; /* compatibility */
1be7892f 933 if (test_bit(Faulty, &rdev2->flags))
1da177e4 934 d->state = (1<<MD_DISK_FAULTY);
1be7892f 935 else if (test_bit(In_sync, &rdev2->flags)) {
1da177e4
LT		 936 d->state = (1<<MD_DISK_ACTIVE);
937 d->state |= (1<<MD_DISK_SYNC);
938 active++;
939 working++;
940 } else {
941 d->state = 0;
942 spare++;
943 working++;
944 }
8ddf9efe
N		 945 if (test_bit(WriteMostly, &rdev2->flags))
946 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4 947 }
1da177e4
LT		 948 /* now set the "removed" and "faulty" bits on any missing devices */
949 for (i=0 ; i < mddev->raid_disks ; i++) {
950 mdp_disk_t *d = &sb->disks[i];
951 if (d->state == 0 && d->number == 0) {
952 d->number = i;
953 d->raid_disk = i;
954 d->state = (1<<MD_DISK_REMOVED);
955 d->state |= (1<<MD_DISK_FAULTY);
956 failed++;
957 }
958 }
959 sb->nr_disks = nr_disks;
960 sb->active_disks = active;
961 sb->working_disks = working;
962 sb->failed_disks = failed;
963 sb->spare_disks = spare;
964
965 sb->this_disk = sb->disks[rdev->desc_nr];
966 sb->sb_csum = calc_sb_csum(sb);
967}
968
969/*
970 * version 1 superblock
971 */
972
973static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
974{
975 unsigned int disk_csum, csum;
976 unsigned long long newcsum;
977 int size = 256 + le32_to_cpu(sb->max_dev)*2;
978 unsigned int *isuper = (unsigned int*)sb;
979 int i;
980
981 disk_csum = sb->sb_csum;
982 sb->sb_csum = 0;
983 newcsum = 0;
984 for (i=0; size>=4; size -= 4 )
985 newcsum += le32_to_cpu(*isuper++);
986
987 if (size == 2)
988 newcsum += le16_to_cpu(*(unsigned short*) isuper);
989
990 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
991 sb->sb_csum = disk_csum;
992 return cpu_to_le32(csum);
993}
994
995static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
996{
997 struct mdp_superblock_1 *sb;
998 int ret;
999 sector_t sb_offset;
1000 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 1001 int bmask;
1da177e4
LT		 1002
1003 /*
1004 * Calculate the position of the superblock.
1005 * It is always aligned to a 4K boundary and
1006 * depeding on minor_version, it can be:
1007 * 0: At least 8K, but less than 12K, from end of device
1008 * 1: At start of device
1009 * 2: 4K from start of device.
1010 */
1011 switch(minor_version) {
1012 case 0:
1013 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1014 sb_offset -= 8*2;
39730960 1015 sb_offset &= ~(sector_t)(4*2-1);
1da177e4
LT		 1016 /* convert from sectors to K */
1017 sb_offset /= 2;
1018 break;
1019 case 1:
1020 sb_offset = 0;
1021 break;
1022 case 2:
1023 sb_offset = 4;
1024 break;
1025 default:
1026 return -EINVAL;
1027 }
1028 rdev->sb_offset = sb_offset;
1029
0002b271
N		 1030 /* superblock is rarely larger than 1K, but it can be larger,
1031 * and it is safe to read 4k, so we do that
1032 */
1033 ret = read_disk_sb(rdev, 4096);
1da177e4
LT		 1034 if (ret) return ret;
1035
1036
1037 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1038
1039 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1040 sb->major_version != cpu_to_le32(1) ||
1041 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1042 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
71c0805c 1043 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT		 1044 return -EINVAL;
1045
1046 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1047 printk("md: invalid superblock checksum on %s\n",
1048 bdevname(rdev->bdev,b));
1049 return -EINVAL;
1050 }
1051 if (le64_to_cpu(sb->data_size) < 10) {
1052 printk("md: data_size too small on %s\n",
1053 bdevname(rdev->bdev,b));
1054 return -EINVAL;
1055 }
1056 rdev->preferred_minor = 0xffff;
1057 rdev->data_offset = le64_to_cpu(sb->data_offset);
4dbcdc75 1058 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1da177e4 1059
0002b271 1060 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
720a3dc3 1061 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
0002b271
N		 1062 if (rdev->sb_size & bmask)
1063 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1064
31b65a0d
N		 1065 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1066 rdev->desc_nr = -1;
1067 else
1068 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1069
1da177e4 1070 if (refdev == 0)
8ed75463 1071 ret = 1;
1da177e4
LT		 1072 else {
1073 __u64 ev1, ev2;
1074 struct mdp_superblock_1 *refsb =
1075 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1076
1077 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1078 sb->level != refsb->level ||
1079 sb->layout != refsb->layout ||
1080 sb->chunksize != refsb->chunksize) {
1081 printk(KERN_WARNING "md: %s has strangely different"
1082 " superblock to %s\n",
1083 bdevname(rdev->bdev,b),
1084 bdevname(refdev->bdev,b2));
1085 return -EINVAL;
1086 }
1087 ev1 = le64_to_cpu(sb->events);
1088 ev2 = le64_to_cpu(refsb->events);
1089
1090 if (ev1 > ev2)
8ed75463
N		 1091 ret = 1;
1092 else
1093 ret = 0;
1da177e4
LT		 1094 }
1095 if (minor_version)
1096 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1097 else
1098 rdev->size = rdev->sb_offset;
1099 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1100 return -EINVAL;
1101 rdev->size = le64_to_cpu(sb->data_size)/2;
1102 if (le32_to_cpu(sb->chunksize))
1103 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
2bf071bf
N		 1104
1105 if (le32_to_cpu(sb->size) > rdev->size*2)
1106 return -EINVAL;
8ed75463 1107 return ret;
1da177e4
LT		 1108}
1109
1110static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1111{
1112 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
07d84d10 1113 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4 1114
41158c7e 1115 rdev->raid_disk = -1;
b2d444d7 1116 rdev->flags = 0;
1da177e4
LT		 1117 if (mddev->raid_disks == 0) {
1118 mddev->major_version = 1;
1119 mddev->patch_version = 0;
1120 mddev->persistent = 1;
1121 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1122 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1123 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1124 mddev->level = le32_to_cpu(sb->level);
d9d166c2 1125 mddev->clevel[0] = 0;
1da177e4
LT		 1126 mddev->layout = le32_to_cpu(sb->layout);
1127 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1128 mddev->size = le64_to_cpu(sb->size)/2;
07d84d10 1129 mddev->events = ev1;
9223214e 1130 mddev->bitmap_offset = 0;
29fc7e3e 1131 mddev->default_bitmap_offset = 1024 >> 9;
1da177e4
LT		 1132
1133 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1134 memcpy(mddev->uuid, sb->set_uuid, 16);
1135
1136 mddev->max_disks = (4096-256)/2;
a654b9d8 1137
71c0805c 1138 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
a654b9d8 1139 mddev->bitmap_file == NULL ) {
6cce3b23
N		 1140 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
1141 && mddev->level != 10) {
1142 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
a654b9d8
N		 1143 return -EINVAL;
1144 }
1145 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1146 }
f6705578
N		 1147 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1148 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1149 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1150 mddev->new_level = le32_to_cpu(sb->new_level);
1151 mddev->new_layout = le32_to_cpu(sb->new_layout);
1152 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1153 } else {
1154 mddev->reshape_position = MaxSector;
1155 mddev->delta_disks = 0;
1156 mddev->new_level = mddev->level;
1157 mddev->new_layout = mddev->layout;
1158 mddev->new_chunk = mddev->chunk_size;
1159 }
1160
41158c7e
N		 1161 } else if (mddev->pers == NULL) {
1162 /* Insist of good event counter while assembling */
1da177e4
LT		 1163 ++ev1;
1164 if (ev1 < mddev->events)
1165 return -EINVAL;
41158c7e
N		 1166 } else if (mddev->bitmap) {
1167 /* If adding to array with a bitmap, then we can accept an
1168 * older device, but not too old.
1169 */
41158c7e
N		 1170 if (ev1 < mddev->bitmap->events_cleared)
1171 return 0;
07d84d10
N		 1172 } else {
1173 if (ev1 < mddev->events)
1174 /* just a hot-add of a new device, leave raid_disk at -1 */
1175 return 0;
1176 }
1da177e4
LT		 1177 if (mddev->level != LEVEL_MULTIPATH) {
1178 int role;
1da177e4
LT		 1179 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1180 switch(role) {
1181 case 0xffff: /* spare */
1da177e4
LT		 1182 break;
1183 case 0xfffe: /* faulty */
b2d444d7 1184 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 1185 break;
1186 default:
5fd6c1dc
N		 1187 if ((le32_to_cpu(sb->feature_map) &
1188 MD_FEATURE_RECOVERY_OFFSET))
1189 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1190 else
1191 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1192 rdev->raid_disk = role;
1193 break;
1194 }
8ddf9efe
N		 1195 if (sb->devflags & WriteMostly1)
1196 set_bit(WriteMostly, &rdev->flags);
41158c7e 1197 } else /* MULTIPATH are always insync */
b2d444d7 1198 set_bit(In_sync, &rdev->flags);
41158c7e 1199
1da177e4
LT		 1200 return 0;
1201}
1202
1203static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1204{
1205 struct mdp_superblock_1 *sb;
1206 struct list_head *tmp;
1207 mdk_rdev_t *rdev2;
1208 int max_dev, i;
1209 /* make rdev->sb match mddev and rdev data. */
1210
1211 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1212
1213 sb->feature_map = 0;
1214 sb->pad0 = 0;
5fd6c1dc 1215 sb->recovery_offset = cpu_to_le64(0);
1da177e4
LT		 1216 memset(sb->pad1, 0, sizeof(sb->pad1));
1217 memset(sb->pad2, 0, sizeof(sb->pad2));
1218 memset(sb->pad3, 0, sizeof(sb->pad3));
1219
1220 sb->utime = cpu_to_le64((__u64)mddev->utime);
1221 sb->events = cpu_to_le64(mddev->events);
1222 if (mddev->in_sync)
1223 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1224 else
1225 sb->resync_offset = cpu_to_le64(0);
1226
4dbcdc75
N		 1227 sb->cnt_corrected_read = atomic_read(&rdev->corrected_errors);
1228
f0ca340c 1229 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
29fc7e3e 1230 sb->size = cpu_to_le64(mddev->size<<1);
f0ca340c 1231
a654b9d8
N		 1232 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1233 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
71c0805c 1234 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8 1235 }
5fd6c1dc
N		 1236
1237 if (rdev->raid_disk >= 0 &&
1238 !test_bit(In_sync, &rdev->flags) &&
1239 rdev->recovery_offset > 0) {
1240 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1241 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1242 }
1243
f6705578
N		 1244 if (mddev->reshape_position != MaxSector) {
1245 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1246 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1247 sb->new_layout = cpu_to_le32(mddev->new_layout);
1248 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1249 sb->new_level = cpu_to_le32(mddev->new_level);
1250 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1251 }
a654b9d8 1252
1da177e4
LT		 1253 max_dev = 0;
1254 ITERATE_RDEV(mddev,rdev2,tmp)
1255 if (rdev2->desc_nr+1 > max_dev)
1256 max_dev = rdev2->desc_nr+1;
1257
1258 sb->max_dev = cpu_to_le32(max_dev);
1259 for (i=0; i<max_dev;i++)
1260 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1261
1262 ITERATE_RDEV(mddev,rdev2,tmp) {
1263 i = rdev2->desc_nr;
b2d444d7 1264 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1265 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1266 else if (test_bit(In_sync, &rdev2->flags))
1da177e4 1267 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
5fd6c1dc
N		 1268 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1269 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1da177e4
LT		 1270 else
1271 sb->dev_roles[i] = cpu_to_le16(0xffff);
1272 }
1273
1da177e4
LT		 1274 sb->sb_csum = calc_sb_1_csum(sb);
1275}
1276
1277
75c96f85 1278static struct super_type super_types[] = {
1da177e4
LT		 1279 [0] = {
1280 .name = "0.90.0",
1281 .owner = THIS_MODULE,
1282 .load_super = super_90_load,
1283 .validate_super = super_90_validate,
1284 .sync_super = super_90_sync,
1285 },
1286 [1] = {
1287 .name = "md-1",
1288 .owner = THIS_MODULE,
1289 .load_super = super_1_load,
1290 .validate_super = super_1_validate,
1291 .sync_super = super_1_sync,
1292 },
1293};
1294
1295static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1296{
1297 struct list_head *tmp;
1298 mdk_rdev_t *rdev;
1299
1300 ITERATE_RDEV(mddev,rdev,tmp)
1301 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1302 return rdev;
1303
1304 return NULL;
1305}
1306
1307static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1308{
1309 struct list_head *tmp;
1310 mdk_rdev_t *rdev;
1311
1312 ITERATE_RDEV(mddev1,rdev,tmp)
1313 if (match_dev_unit(mddev2, rdev))
1314 return 1;
1315
1316 return 0;
1317}
1318
1319static LIST_HEAD(pending_raid_disks);
1320
1321static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1322{
1323 mdk_rdev_t *same_pdev;
1324 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
f637b9f9 1325 struct kobject *ko;
1edf80d3 1326 char *s;
1da177e4
LT		 1327
1328 if (rdev->mddev) {
1329 MD_BUG();
1330 return -EINVAL;
1331 }
2bf071bf
N		 1332 /* make sure rdev->size exceeds mddev->size */
1333 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1334 if (mddev->pers)
1335 /* Cannot change size, so fail */
1336 return -ENOSPC;
1337 else
1338 mddev->size = rdev->size;
1339 }
1da177e4
LT		 1340 same_pdev = match_dev_unit(mddev, rdev);
1341 if (same_pdev)
1342 printk(KERN_WARNING
1343 "%s: WARNING: %s appears to be on the same physical"
1344 " disk as %s. True\n protection against single-disk"
1345 " failure might be compromised.\n",
1346 mdname(mddev), bdevname(rdev->bdev,b),
1347 bdevname(same_pdev->bdev,b2));
1348
1349 /* Verify rdev->desc_nr is unique.
1350 * If it is -1, assign a free number, else
1351 * check number is not in use
1352 */
1353 if (rdev->desc_nr < 0) {
1354 int choice = 0;
1355 if (mddev->pers) choice = mddev->raid_disks;
1356 while (find_rdev_nr(mddev, choice))
1357 choice++;
1358 rdev->desc_nr = choice;
1359 } else {
1360 if (find_rdev_nr(mddev, rdev->desc_nr))
1361 return -EBUSY;
1362 }
19133a42
N		 1363 bdevname(rdev->bdev,b);
1364 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1365 return -ENOMEM;
1edf80d3
NB		 1366 while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
1367 *s = '!';
1da177e4
LT		 1368
1369 list_add(&rdev->same_set, &mddev->disks);
1370 rdev->mddev = mddev;
19133a42 1371 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 1372
9c791977 1373 rdev->kobj.parent = &mddev->kobj;
86e6ffdd
N		 1374 kobject_add(&rdev->kobj);
1375
f637b9f9
N		 1376 if (rdev->bdev->bd_part)
1377 ko = &rdev->bdev->bd_part->kobj;
1378 else
1379 ko = &rdev->bdev->bd_disk->kobj;
1380 sysfs_create_link(&rdev->kobj, ko, "block");
5463c790 1381 bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
1da177e4
LT		 1382 return 0;
1383}
1384
1385static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1386{
1387 char b[BDEVNAME_SIZE];
1388 if (!rdev->mddev) {
1389 MD_BUG();
1390 return;
1391 }
5463c790 1392 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1da177e4
LT		 1393 list_del_init(&rdev->same_set);
1394 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1395 rdev->mddev = NULL;
86e6ffdd
N		 1396 sysfs_remove_link(&rdev->kobj, "block");
1397 kobject_del(&rdev->kobj);
1da177e4
LT		 1398}
1399
1400/*
1401 * prevent the device from being mounted, repartitioned or
1402 * otherwise reused by a RAID array (or any other kernel
1403 * subsystem), by bd_claiming the device.
1404 */
1405static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1406{
1407 int err = 0;
1408 struct block_device *bdev;
1409 char b[BDEVNAME_SIZE];
1410
663d440e 1411 bdev = open_partition_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1da177e4
LT		 1412 if (IS_ERR(bdev)) {
1413 printk(KERN_ERR "md: could not open %s.\n",
1414 __bdevname(dev, b));
1415 return PTR_ERR(bdev);
1416 }
1417 err = bd_claim(bdev, rdev);
1418 if (err) {
1419 printk(KERN_ERR "md: could not bd_claim %s.\n",
1420 bdevname(bdev, b));
663d440e 1421 blkdev_put_partition(bdev);
1da177e4
LT		 1422 return err;
1423 }
1424 rdev->bdev = bdev;
1425 return err;
1426}
1427
1428static void unlock_rdev(mdk_rdev_t *rdev)
1429{
1430 struct block_device *bdev = rdev->bdev;
1431 rdev->bdev = NULL;
1432 if (!bdev)
1433 MD_BUG();
1434 bd_release(bdev);
663d440e 1435 blkdev_put_partition(bdev);
1da177e4
LT		 1436}
1437
1438void md_autodetect_dev(dev_t dev);
1439
1440static void export_rdev(mdk_rdev_t * rdev)
1441{
1442 char b[BDEVNAME_SIZE];
1443 printk(KERN_INFO "md: export_rdev(%s)\n",
1444 bdevname(rdev->bdev,b));
1445 if (rdev->mddev)
1446 MD_BUG();
1447 free_disk_sb(rdev);
1448 list_del_init(&rdev->same_set);
1449#ifndef MODULE
1450 md_autodetect_dev(rdev->bdev->bd_dev);
1451#endif
1452 unlock_rdev(rdev);
86e6ffdd 1453 kobject_put(&rdev->kobj);
1da177e4
LT		 1454}
1455
1456static void kick_rdev_from_array(mdk_rdev_t * rdev)
1457{
1458 unbind_rdev_from_array(rdev);
1459 export_rdev(rdev);
1460}
1461
1462static void export_array(mddev_t *mddev)
1463{
1464 struct list_head *tmp;
1465 mdk_rdev_t *rdev;
1466
1467 ITERATE_RDEV(mddev,rdev,tmp) {
1468 if (!rdev->mddev) {
1469 MD_BUG();
1470 continue;
1471 }
1472 kick_rdev_from_array(rdev);
1473 }
1474 if (!list_empty(&mddev->disks))
1475 MD_BUG();
1476 mddev->raid_disks = 0;
1477 mddev->major_version = 0;
1478}
1479
1480static void print_desc(mdp_disk_t *desc)
1481{
1482 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1483 desc->major,desc->minor,desc->raid_disk,desc->state);
1484}
1485
1486static void print_sb(mdp_super_t *sb)
1487{
1488 int i;
1489
1490 printk(KERN_INFO
1491 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1492 sb->major_version, sb->minor_version, sb->patch_version,
1493 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1494 sb->ctime);
1495 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1496 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1497 sb->md_minor, sb->layout, sb->chunk_size);
1498 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1499 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1500 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1501 sb->failed_disks, sb->spare_disks,
1502 sb->sb_csum, (unsigned long)sb->events_lo);
1503
1504 printk(KERN_INFO);
1505 for (i = 0; i < MD_SB_DISKS; i++) {
1506 mdp_disk_t *desc;
1507
1508 desc = sb->disks + i;
1509 if (desc->number || desc->major || desc->minor ||
1510 desc->raid_disk || (desc->state && (desc->state != 4))) {
1511 printk(" D %2d: ", i);
1512 print_desc(desc);
1513 }
1514 }
1515 printk(KERN_INFO "md: THIS: ");
1516 print_desc(&sb->this_disk);
1517
1518}
1519
1520static void print_rdev(mdk_rdev_t *rdev)
1521{
1522 char b[BDEVNAME_SIZE];
1523 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1524 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
b2d444d7
N		 1525 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1526 rdev->desc_nr);
1da177e4
LT		 1527 if (rdev->sb_loaded) {
1528 printk(KERN_INFO "md: rdev superblock:\n");
1529 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1530 } else
1531 printk(KERN_INFO "md: no rdev superblock!\n");
1532}
1533
5e56341d 1534static void md_print_devices(void)
1da177e4
LT		 1535{
1536 struct list_head *tmp, *tmp2;
1537 mdk_rdev_t *rdev;
1538 mddev_t *mddev;
1539 char b[BDEVNAME_SIZE];
1540
1541 printk("\n");
1542 printk("md: **********************************\n");
1543 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1544 printk("md: **********************************\n");
1545 ITERATE_MDDEV(mddev,tmp) {
1da177e4 1546
32a7627c
N		 1547 if (mddev->bitmap)
1548 bitmap_print_sb(mddev->bitmap);
1549 else
1550 printk("%s: ", mdname(mddev));
1da177e4
LT		 1551 ITERATE_RDEV(mddev,rdev,tmp2)
1552 printk("<%s>", bdevname(rdev->bdev,b));
1553 printk("\n");
1554
1555 ITERATE_RDEV(mddev,rdev,tmp2)
1556 print_rdev(rdev);
1557 }
1558 printk("md: **********************************\n");
1559 printk("\n");
1560}
1561
1562
42543769 1563static void sync_sbs(mddev_t * mddev, int nospares)
1da177e4 1564{
42543769
N		 1565 /* Update each superblock (in-memory image), but
1566 * if we are allowed to, skip spares which already
1567 * have the right event counter, or have one earlier
1568 * (which would mean they aren't being marked as dirty
1569 * with the rest of the array)
1570 */
1da177e4
LT		 1571 mdk_rdev_t *rdev;
1572 struct list_head *tmp;
1573
1574 ITERATE_RDEV(mddev,rdev,tmp) {
42543769
N		 1575 if (rdev->sb_events == mddev->events ||
1576 (nospares &&
1577 rdev->raid_disk < 0 &&
1578 (rdev->sb_events&1)==0 &&
1579 rdev->sb_events+1 == mddev->events)) {
1580 /* Don't update this superblock */
1581 rdev->sb_loaded = 2;
1582 } else {
1583 super_types[mddev->major_version].
1584 sync_super(mddev, rdev);
1585 rdev->sb_loaded = 1;
1586 }
1da177e4
LT		 1587 }
1588}
1589
850b2b42 1590static void md_update_sb(mddev_t * mddev, int force_change)
1da177e4 1591{
7bfa19f2 1592 int err;
1da177e4
LT		 1593 struct list_head *tmp;
1594 mdk_rdev_t *rdev;
06d91a5f 1595 int sync_req;
42543769 1596 int nospares = 0;
1da177e4 1597
1da177e4 1598repeat:
a9701a30 1599 spin_lock_irq(&mddev->write_lock);
84692195 1600
850b2b42
N		 1601 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1602 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1603 force_change = 1;
1604 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1605 /* just a clean<-> dirty transition, possibly leave spares alone,
1606 * though if events isn't the right even/odd, we will have to do
1607 * spares after all
1608 */
1609 nospares = 1;
1610 if (force_change)
1611 nospares = 0;
1612 if (mddev->degraded)
84692195
N		 1613 /* If the array is degraded, then skipping spares is both
1614 * dangerous and fairly pointless.
1615 * Dangerous because a device that was removed from the array
1616 * might have a event_count that still looks up-to-date,
1617 * so it can be re-added without a resync.
1618 * Pointless because if there are any spares to skip,
1619 * then a recovery will happen and soon that array won't
1620 * be degraded any more and the spare can go back to sleep then.
1621 */
850b2b42 1622 nospares = 0;
84692195 1623
06d91a5f 1624 sync_req = mddev->in_sync;
1da177e4 1625 mddev->utime = get_seconds();
42543769
N		 1626
1627 /* If this is just a dirty<->clean transition, and the array is clean
1628 * and 'events' is odd, we can roll back to the previous clean state */
850b2b42 1629 if (nospares
42543769
N		 1630 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1631 && (mddev->events & 1))
1632 mddev->events--;
1633 else {
1634 /* otherwise we have to go forward and ... */
1635 mddev->events ++;
1636 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1637 /* .. if the array isn't clean, insist on an odd 'events' */
1638 if ((mddev->events&1)==0) {
1639 mddev->events++;
1640 nospares = 0;
1641 }
1642 } else {
1643 /* otherwise insist on an even 'events' (for clean states) */
1644 if ((mddev->events&1)) {
1645 mddev->events++;
1646 nospares = 0;
1647 }
1648 }
1649 }
1da177e4
LT		 1650
1651 if (!mddev->events) {
1652 /*
1653 * oops, this 64-bit counter should never wrap.
1654 * Either we are in around ~1 trillion A.C., assuming
1655 * 1 reboot per second, or we have a bug:
1656 */
1657 MD_BUG();
1658 mddev->events --;
1659 }
42543769 1660 sync_sbs(mddev, nospares);
1da177e4
LT		 1661
1662 /*
1663 * do not write anything to disk if using
1664 * nonpersistent superblocks
1665 */
06d91a5f 1666 if (!mddev->persistent) {
850b2b42 1667 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
a9701a30 1668 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1669 wake_up(&mddev->sb_wait);
1da177e4 1670 return;
06d91a5f 1671 }
a9701a30 1672 spin_unlock_irq(&mddev->write_lock);
1da177e4
LT		 1673
1674 dprintk(KERN_INFO
1675 "md: updating %s RAID superblock on device (in sync %d)\n",
1676 mdname(mddev),mddev->in_sync);
1677
32a7627c 1678 err = bitmap_update_sb(mddev->bitmap);
1da177e4
LT		 1679 ITERATE_RDEV(mddev,rdev,tmp) {
1680 char b[BDEVNAME_SIZE];
1681 dprintk(KERN_INFO "md: ");
42543769
N		 1682 if (rdev->sb_loaded != 1)
1683 continue; /* no noise on spare devices */
b2d444d7 1684 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1685 dprintk("(skipping faulty ");
1686
1687 dprintk("%s ", bdevname(rdev->bdev,b));
b2d444d7 1688 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 1689 md_super_write(mddev,rdev,
0002b271 1690 rdev->sb_offset<<1, rdev->sb_size,
7bfa19f2
N		 1691 rdev->sb_page);
1692 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1693 bdevname(rdev->bdev,b),
1694 (unsigned long long)rdev->sb_offset);
42543769 1695 rdev->sb_events = mddev->events;
7bfa19f2 1696
1da177e4
LT		 1697 } else
1698 dprintk(")\n");
7bfa19f2 1699 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT		 1700 /* only need to write one superblock... */
1701 break;
1702 }
a9701a30 1703 md_super_wait(mddev);
850b2b42 1704 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
7bfa19f2 1705
a9701a30 1706 spin_lock_irq(&mddev->write_lock);
850b2b42
N		 1707 if (mddev->in_sync != sync_req ||
1708 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
06d91a5f 1709 /* have to write it out again */
a9701a30 1710 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N		 1711 goto repeat;
1712 }
850b2b42 1713 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
a9701a30 1714 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1715 wake_up(&mddev->sb_wait);
06d91a5f 1716
1da177e4
LT		 1717}
1718
bce74dac
N		 1719/* words written to sysfs files may, or my not, be \n terminated.
1720 * We want to accept with case. For this we use cmd_match.
1721 */
1722static int cmd_match(const char *cmd, const char *str)
1723{
1724 /* See if cmd, written into a sysfs file, matches
1725 * str. They must either be the same, or cmd can
1726 * have a trailing newline
1727 */
1728 while (*cmd && *str && *cmd == *str) {
1729 cmd++;
1730 str++;
1731 }
1732 if (*cmd == '\n')
1733 cmd++;
1734 if (*str || *cmd)
1735 return 0;
1736 return 1;
1737}
1738
86e6ffdd
N		 1739struct rdev_sysfs_entry {
1740 struct attribute attr;
1741 ssize_t (*show)(mdk_rdev_t *, char *);
1742 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1743};
1744
1745static ssize_t
96de1e66 1746state_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1747{
1748 char *sep = "";
1749 int len=0;
1750
b2d444d7 1751 if (test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 1752 len+= sprintf(page+len, "%sfaulty",sep);
1753 sep = ",";
1754 }
b2d444d7 1755 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1756 len += sprintf(page+len, "%sin_sync",sep);
1757 sep = ",";
1758 }
f655675b
N		 1759 if (test_bit(WriteMostly, &rdev->flags)) {
1760 len += sprintf(page+len, "%swrite_mostly",sep);
1761 sep = ",";
1762 }
b2d444d7
N		 1763 if (!test_bit(Faulty, &rdev->flags) &&
1764 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1765 len += sprintf(page+len, "%sspare", sep);
1766 sep = ",";
1767 }
1768 return len+sprintf(page+len, "\n");
1769}
1770
45dc2de1
N		 1771static ssize_t
1772state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1773{
1774 /* can write
1775 * faulty - simulates and error
1776 * remove - disconnects the device
f655675b
N		 1777 * writemostly - sets write_mostly
1778 * -writemostly - clears write_mostly
45dc2de1
N		 1779 */
1780 int err = -EINVAL;
1781 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1782 md_error(rdev->mddev, rdev);
1783 err = 0;
1784 } else if (cmd_match(buf, "remove")) {
1785 if (rdev->raid_disk >= 0)
1786 err = -EBUSY;
1787 else {
1788 mddev_t *mddev = rdev->mddev;
1789 kick_rdev_from_array(rdev);
850b2b42 1790 md_update_sb(mddev, 1);
45dc2de1
N		 1791 md_new_event(mddev);
1792 err = 0;
1793 }
f655675b
N		 1794 } else if (cmd_match(buf, "writemostly")) {
1795 set_bit(WriteMostly, &rdev->flags);
1796 err = 0;
1797 } else if (cmd_match(buf, "-writemostly")) {
1798 clear_bit(WriteMostly, &rdev->flags);
1799 err = 0;
45dc2de1
N		 1800 }
1801 return err ? err : len;
1802}
80ca3a44
N		 1803static struct rdev_sysfs_entry rdev_state =
1804__ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
86e6ffdd
N		 1805
1806static ssize_t
96de1e66 1807super_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1808{
1809 if (rdev->sb_loaded && rdev->sb_size) {
1810 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1811 return rdev->sb_size;
1812 } else
1813 return 0;
1814}
96de1e66
N		 1815static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1816
4dbcdc75
N		 1817static ssize_t
1818errors_show(mdk_rdev_t *rdev, char *page)
1819{
1820 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1821}
1822
1823static ssize_t
1824errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1825{
1826 char *e;
1827 unsigned long n = simple_strtoul(buf, &e, 10);
1828 if (*buf && (*e == 0 || *e == '\n')) {
1829 atomic_set(&rdev->corrected_errors, n);
1830 return len;
1831 }
1832 return -EINVAL;
1833}
1834static struct rdev_sysfs_entry rdev_errors =
80ca3a44 1835__ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
4dbcdc75 1836
014236d2
N		 1837static ssize_t
1838slot_show(mdk_rdev_t *rdev, char *page)
1839{
1840 if (rdev->raid_disk < 0)
1841 return sprintf(page, "none\n");
1842 else
1843 return sprintf(page, "%d\n", rdev->raid_disk);
1844}
1845
1846static ssize_t
1847slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1848{
1849 char *e;
1850 int slot = simple_strtoul(buf, &e, 10);
1851 if (strncmp(buf, "none", 4)==0)
1852 slot = -1;
1853 else if (e==buf || (*e && *e!= '\n'))
1854 return -EINVAL;
1855 if (rdev->mddev->pers)
1856 /* Cannot set slot in active array (yet) */
1857 return -EBUSY;
1858 if (slot >= rdev->mddev->raid_disks)
1859 return -ENOSPC;
1860 rdev->raid_disk = slot;
1861 /* assume it is working */
1862 rdev->flags = 0;
1863 set_bit(In_sync, &rdev->flags);
1864 return len;
1865}
1866
1867
1868static struct rdev_sysfs_entry rdev_slot =
80ca3a44 1869__ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
014236d2 1870
93c8cad0
N		 1871static ssize_t
1872offset_show(mdk_rdev_t *rdev, char *page)
1873{
6961ece4 1874 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
93c8cad0
N		 1875}
1876
1877static ssize_t
1878offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1879{
1880 char *e;
1881 unsigned long long offset = simple_strtoull(buf, &e, 10);
1882 if (e==buf || (*e && *e != '\n'))
1883 return -EINVAL;
1884 if (rdev->mddev->pers)
1885 return -EBUSY;
1886 rdev->data_offset = offset;
1887 return len;
1888}
1889
1890static struct rdev_sysfs_entry rdev_offset =
80ca3a44 1891__ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
93c8cad0 1892
83303b61
N		 1893static ssize_t
1894rdev_size_show(mdk_rdev_t *rdev, char *page)
1895{
1896 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1897}
1898
1899static ssize_t
1900rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1901{
1902 char *e;
1903 unsigned long long size = simple_strtoull(buf, &e, 10);
1904 if (e==buf || (*e && *e != '\n'))
1905 return -EINVAL;
1906 if (rdev->mddev->pers)
1907 return -EBUSY;
1908 rdev->size = size;
1909 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1910 rdev->mddev->size = size;
1911 return len;
1912}
1913
1914static struct rdev_sysfs_entry rdev_size =
80ca3a44 1915__ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
83303b61 1916
86e6ffdd
N		 1917static struct attribute *rdev_default_attrs[] = {
1918 &rdev_state.attr,
1919 &rdev_super.attr,
4dbcdc75 1920 &rdev_errors.attr,
014236d2 1921 &rdev_slot.attr,
93c8cad0 1922 &rdev_offset.attr,
83303b61 1923 &rdev_size.attr,
86e6ffdd
N		 1924 NULL,
1925};
1926static ssize_t
1927rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1928{
1929 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1930 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1931
1932 if (!entry->show)
1933 return -EIO;
1934 return entry->show(rdev, page);
1935}
1936
1937static ssize_t
1938rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1939 const char *page, size_t length)
1940{
1941 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1942 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1943
1944 if (!entry->store)
1945 return -EIO;
67463acb
N		 1946 if (!capable(CAP_SYS_ADMIN))
1947 return -EACCES;
86e6ffdd
N		 1948 return entry->store(rdev, page, length);
1949}
1950
1951static void rdev_free(struct kobject *ko)
1952{
1953 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1954 kfree(rdev);
1955}
1956static struct sysfs_ops rdev_sysfs_ops = {
1957 .show = rdev_attr_show,
1958 .store = rdev_attr_store,
1959};
1960static struct kobj_type rdev_ktype = {
1961 .release = rdev_free,
1962 .sysfs_ops = &rdev_sysfs_ops,
1963 .default_attrs = rdev_default_attrs,
1964};
1965
1da177e4
LT		 1966/*
1967 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1968 *
1969 * mark the device faulty if:
1970 *
1971 * - the device is nonexistent (zero size)
1972 * - the device has no valid superblock
1973 *
1974 * a faulty rdev _never_ has rdev->sb set.
1975 */
1976static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1977{
1978 char b[BDEVNAME_SIZE];
1979 int err;
1980 mdk_rdev_t *rdev;
1981 sector_t size;
1982
9ffae0cf 1983 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1da177e4
LT		 1984 if (!rdev) {
1985 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1986 return ERR_PTR(-ENOMEM);
1987 }
1da177e4
LT		 1988
1989 if ((err = alloc_disk_sb(rdev)))
1990 goto abort_free;
1991
1992 err = lock_rdev(rdev, newdev);
1993 if (err)
1994 goto abort_free;
1995
86e6ffdd
N		 1996 rdev->kobj.parent = NULL;
1997 rdev->kobj.ktype = &rdev_ktype;
1998 kobject_init(&rdev->kobj);
1999
1da177e4 2000 rdev->desc_nr = -1;
b2d444d7 2001 rdev->flags = 0;
1da177e4 2002 rdev->data_offset = 0;
42543769 2003 rdev->sb_events = 0;
1da177e4 2004 atomic_set(&rdev->nr_pending, 0);
ba22dcbf 2005 atomic_set(&rdev->read_errors, 0);
4dbcdc75 2006 atomic_set(&rdev->corrected_errors, 0);
1da177e4
LT		 2007
2008 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2009 if (!size) {
2010 printk(KERN_WARNING
2011 "md: %s has zero or unknown size, marking faulty!\n",
2012 bdevname(rdev->bdev,b));
2013 err = -EINVAL;
2014 goto abort_free;
2015 }
2016
2017 if (super_format >= 0) {
2018 err = super_types[super_format].
2019 load_super(rdev, NULL, super_minor);
2020 if (err == -EINVAL) {
2021 printk(KERN_WARNING
2022 "md: %s has invalid sb, not importing!\n",
2023 bdevname(rdev->bdev,b));
2024 goto abort_free;
2025 }
2026 if (err < 0) {
2027 printk(KERN_WARNING
2028 "md: could not read %s's sb, not importing!\n",
2029 bdevname(rdev->bdev,b));
2030 goto abort_free;
2031 }
2032 }
2033 INIT_LIST_HEAD(&rdev->same_set);
2034
2035 return rdev;
2036
2037abort_free:
2038 if (rdev->sb_page) {
2039 if (rdev->bdev)
2040 unlock_rdev(rdev);
2041 free_disk_sb(rdev);
2042 }
2043 kfree(rdev);
2044 return ERR_PTR(err);
2045}
2046
2047/*
2048 * Check a full RAID array for plausibility
2049 */
2050
2051
a757e64c 2052static void analyze_sbs(mddev_t * mddev)
1da177e4
LT		 2053{
2054 int i;
2055 struct list_head *tmp;
2056 mdk_rdev_t *rdev, *freshest;
2057 char b[BDEVNAME_SIZE];
2058
2059 freshest = NULL;
2060 ITERATE_RDEV(mddev,rdev,tmp)
2061 switch (super_types[mddev->major_version].
2062 load_super(rdev, freshest, mddev->minor_version)) {
2063 case 1:
2064 freshest = rdev;
2065 break;
2066 case 0:
2067 break;
2068 default:
2069 printk( KERN_ERR \
2070 "md: fatal superblock inconsistency in %s"
2071 " -- removing from array\n",
2072 bdevname(rdev->bdev,b));
2073 kick_rdev_from_array(rdev);
2074 }
2075
2076
2077 super_types[mddev->major_version].
2078 validate_super(mddev, freshest);
2079
2080 i = 0;
2081 ITERATE_RDEV(mddev,rdev,tmp) {
2082 if (rdev != freshest)
2083 if (super_types[mddev->major_version].
2084 validate_super(mddev, rdev)) {
2085 printk(KERN_WARNING "md: kicking non-fresh %s"
2086 " from array!\n",
2087 bdevname(rdev->bdev,b));
2088 kick_rdev_from_array(rdev);
2089 continue;
2090 }
2091 if (mddev->level == LEVEL_MULTIPATH) {
2092 rdev->desc_nr = i++;
2093 rdev->raid_disk = rdev->desc_nr;
b2d444d7 2094 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 2095 }
2096 }
2097
2098
2099
2100 if (mddev->recovery_cp != MaxSector &&
2101 mddev->level >= 1)
2102 printk(KERN_ERR "md: %s: raid array is not clean"
2103 " -- starting background reconstruction\n",
2104 mdname(mddev));
2105
1da177e4
LT		 2106}
2107
16f17b39
N		 2108static ssize_t
2109safe_delay_show(mddev_t *mddev, char *page)
2110{
2111 int msec = (mddev->safemode_delay*1000)/HZ;
2112 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2113}
2114static ssize_t
2115safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2116{
2117 int scale=1;
2118 int dot=0;
2119 int i;
2120 unsigned long msec;
2121 char buf[30];
2122 char *e;
2123 /* remove a period, and count digits after it */
2124 if (len >= sizeof(buf))
2125 return -EINVAL;
2126 strlcpy(buf, cbuf, len);
2127 buf[len] = 0;
2128 for (i=0; i<len; i++) {
2129 if (dot) {
2130 if (isdigit(buf[i])) {
2131 buf[i-1] = buf[i];
2132 scale *= 10;
2133 }
2134 buf[i] = 0;
2135 } else if (buf[i] == '.') {
2136 dot=1;
2137 buf[i] = 0;
2138 }
2139 }
2140 msec = simple_strtoul(buf, &e, 10);
2141 if (e == buf || (*e && *e != '\n'))
2142 return -EINVAL;
2143 msec = (msec * 1000) / scale;
2144 if (msec == 0)
2145 mddev->safemode_delay = 0;
2146 else {
2147 mddev->safemode_delay = (msec*HZ)/1000;
2148 if (mddev->safemode_delay == 0)
2149 mddev->safemode_delay = 1;
2150 }
2151 return len;
2152}
2153static struct md_sysfs_entry md_safe_delay =
80ca3a44 2154__ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
16f17b39 2155
eae1701f 2156static ssize_t
96de1e66 2157level_show(mddev_t *mddev, char *page)
eae1701f 2158{
2604b703 2159 struct mdk_personality *p = mddev->pers;
d9d166c2 2160 if (p)
eae1701f 2161 return sprintf(page, "%s\n", p->name);
d9d166c2
N		 2162 else if (mddev->clevel[0])
2163 return sprintf(page, "%s\n", mddev->clevel);
2164 else if (mddev->level != LEVEL_NONE)
2165 return sprintf(page, "%d\n", mddev->level);
2166 else
2167 return 0;
eae1701f
N		 2168}
2169
d9d166c2
N		 2170static ssize_t
2171level_store(mddev_t *mddev, const char *buf, size_t len)
2172{
2173 int rv = len;
2174 if (mddev->pers)
2175 return -EBUSY;
2176 if (len == 0)
2177 return 0;
2178 if (len >= sizeof(mddev->clevel))
2179 return -ENOSPC;
2180 strncpy(mddev->clevel, buf, len);
2181 if (mddev->clevel[len-1] == '\n')
2182 len--;
2183 mddev->clevel[len] = 0;
2184 mddev->level = LEVEL_NONE;
2185 return rv;
2186}
2187
2188static struct md_sysfs_entry md_level =
80ca3a44 2189__ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
eae1701f 2190
d4dbd025
N		 2191
2192static ssize_t
2193layout_show(mddev_t *mddev, char *page)
2194{
2195 /* just a number, not meaningful for all levels */
2196 return sprintf(page, "%d\n", mddev->layout);
2197}
2198
2199static ssize_t
2200layout_store(mddev_t *mddev, const char *buf, size_t len)
2201{
2202 char *e;
2203 unsigned long n = simple_strtoul(buf, &e, 10);
2204 if (mddev->pers)
2205 return -EBUSY;
2206
2207 if (!*buf || (*e && *e != '\n'))
2208 return -EINVAL;
2209
2210 mddev->layout = n;
2211 return len;
2212}
2213static struct md_sysfs_entry md_layout =
80ca3a44 2214__ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
d4dbd025
N		 2215
2216
eae1701f 2217static ssize_t
96de1e66 2218raid_disks_show(mddev_t *mddev, char *page)
eae1701f 2219{
bb636547
N		 2220 if (mddev->raid_disks == 0)
2221 return 0;
eae1701f
N		 2222 return sprintf(page, "%d\n", mddev->raid_disks);
2223}
2224
da943b99
N		 2225static int update_raid_disks(mddev_t *mddev, int raid_disks);
2226
2227static ssize_t
2228raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2229{
2230 /* can only set raid_disks if array is not yet active */
2231 char *e;
2232 int rv = 0;
2233 unsigned long n = simple_strtoul(buf, &e, 10);
2234
2235 if (!*buf || (*e && *e != '\n'))
2236 return -EINVAL;
2237
2238 if (mddev->pers)
2239 rv = update_raid_disks(mddev, n);
2240 else
2241 mddev->raid_disks = n;
2242 return rv ? rv : len;
2243}
2244static struct md_sysfs_entry md_raid_disks =
80ca3a44 2245__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
eae1701f 2246
3b34380a
N		 2247static ssize_t
2248chunk_size_show(mddev_t *mddev, char *page)
2249{
2250 return sprintf(page, "%d\n", mddev->chunk_size);
2251}
2252
2253static ssize_t
2254chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2255{
2256 /* can only set chunk_size if array is not yet active */
2257 char *e;
2258 unsigned long n = simple_strtoul(buf, &e, 10);
2259
2260 if (mddev->pers)
2261 return -EBUSY;
2262 if (!*buf || (*e && *e != '\n'))
2263 return -EINVAL;
2264
2265 mddev->chunk_size = n;
2266 return len;
2267}
2268static struct md_sysfs_entry md_chunk_size =
80ca3a44 2269__ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3b34380a 2270
a94213b1
N		 2271static ssize_t
2272resync_start_show(mddev_t *mddev, char *page)
2273{
2274 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2275}
2276
2277static ssize_t
2278resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2279{
2280 /* can only set chunk_size if array is not yet active */
2281 char *e;
2282 unsigned long long n = simple_strtoull(buf, &e, 10);
2283
2284 if (mddev->pers)
2285 return -EBUSY;
2286 if (!*buf || (*e && *e != '\n'))
2287 return -EINVAL;
2288
2289 mddev->recovery_cp = n;
2290 return len;
2291}
2292static struct md_sysfs_entry md_resync_start =
80ca3a44 2293__ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
a94213b1 2294
9e653b63
N		 2295/*
2296 * The array state can be:
2297 *
2298 * clear
2299 * No devices, no size, no level
2300 * Equivalent to STOP_ARRAY ioctl
2301 * inactive
2302 * May have some settings, but array is not active
2303 * all IO results in error
2304 * When written, doesn't tear down array, but just stops it
2305 * suspended (not supported yet)
2306 * All IO requests will block. The array can be reconfigured.
2307 * Writing this, if accepted, will block until array is quiessent
2308 * readonly
2309 * no resync can happen. no superblocks get written.
2310 * write requests fail
2311 * read-auto
2312 * like readonly, but behaves like 'clean' on a write request.
2313 *
2314 * clean - no pending writes, but otherwise active.
2315 * When written to inactive array, starts without resync
2316 * If a write request arrives then
2317 * if metadata is known, mark 'dirty' and switch to 'active'.
2318 * if not known, block and switch to write-pending
2319 * If written to an active array that has pending writes, then fails.
2320 * active
2321 * fully active: IO and resync can be happening.
2322 * When written to inactive array, starts with resync
2323 *
2324 * write-pending
2325 * clean, but writes are blocked waiting for 'active' to be written.
2326 *
2327 * active-idle
2328 * like active, but no writes have been seen for a while (100msec).
2329 *
2330 */
2331enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2332 write_pending, active_idle, bad_word};
05381954 2333static char *array_states[] = {
9e653b63
N		 2334 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2335 "write-pending", "active-idle", NULL };
2336
2337static int match_word(const char *word, char **list)
2338{
2339 int n;
2340 for (n=0; list[n]; n++)
2341 if (cmd_match(word, list[n]))
2342 break;
2343 return n;
2344}
2345
2346static ssize_t
2347array_state_show(mddev_t *mddev, char *page)
2348{
2349 enum array_state st = inactive;
2350
2351 if (mddev->pers)
2352 switch(mddev->ro) {
2353 case 1:
2354 st = readonly;
2355 break;
2356 case 2:
2357 st = read_auto;
2358 break;
2359 case 0:
2360 if (mddev->in_sync)
2361 st = clean;
2362 else if (mddev->safemode)
2363 st = active_idle;
2364 else
2365 st = active;
2366 }
2367 else {
2368 if (list_empty(&mddev->disks) &&
2369 mddev->raid_disks == 0 &&
2370 mddev->size == 0)
2371 st = clear;
2372 else
2373 st = inactive;
2374 }
2375 return sprintf(page, "%s\n", array_states[st]);
2376}
2377
2378static int do_md_stop(mddev_t * mddev, int ro);
2379static int do_md_run(mddev_t * mddev);
2380static int restart_array(mddev_t *mddev);
2381
2382static ssize_t
2383array_state_store(mddev_t *mddev, const char *buf, size_t len)
2384{
2385 int err = -EINVAL;
2386 enum array_state st = match_word(buf, array_states);
2387 switch(st) {
2388 case bad_word:
2389 break;
2390 case clear:
2391 /* stopping an active array */
2392 if (mddev->pers) {
2393 if (atomic_read(&mddev->active) > 1)
2394 return -EBUSY;
2395 err = do_md_stop(mddev, 0);
2396 }
2397 break;
2398 case inactive:
2399 /* stopping an active array */
2400 if (mddev->pers) {
2401 if (atomic_read(&mddev->active) > 1)
2402 return -EBUSY;
2403 err = do_md_stop(mddev, 2);
2404 }
2405 break;
2406 case suspended:
2407 break; /* not supported yet */
2408 case readonly:
2409 if (mddev->pers)
2410 err = do_md_stop(mddev, 1);
2411 else {
2412 mddev->ro = 1;
2413 err = do_md_run(mddev);
2414 }
2415 break;
2416 case read_auto:
2417 /* stopping an active array */
2418 if (mddev->pers) {
2419 err = do_md_stop(mddev, 1);
2420 if (err == 0)
2421 mddev->ro = 2; /* FIXME mark devices writable */
2422 } else {
2423 mddev->ro = 2;
2424 err = do_md_run(mddev);
2425 }
2426 break;
2427 case clean:
2428 if (mddev->pers) {
2429 restart_array(mddev);
2430 spin_lock_irq(&mddev->write_lock);
2431 if (atomic_read(&mddev->writes_pending) == 0) {
2432 mddev->in_sync = 1;
850b2b42 2433 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
9e653b63
N		 2434 }
2435 spin_unlock_irq(&mddev->write_lock);
2436 } else {
2437 mddev->ro = 0;
2438 mddev->recovery_cp = MaxSector;
2439 err = do_md_run(mddev);
2440 }
2441 break;
2442 case active:
2443 if (mddev->pers) {
2444 restart_array(mddev);
850b2b42 2445 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
9e653b63
N		 2446 wake_up(&mddev->sb_wait);
2447 err = 0;
2448 } else {
2449 mddev->ro = 0;
2450 err = do_md_run(mddev);
2451 }
2452 break;
2453 case write_pending:
2454 case active_idle:
2455 /* these cannot be set */
2456 break;
2457 }
2458 if (err)
2459 return err;
2460 else
2461 return len;
2462}
80ca3a44
N		 2463static struct md_sysfs_entry md_array_state =
2464__ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
9e653b63 2465
6d7ff738
N		 2466static ssize_t
2467null_show(mddev_t *mddev, char *page)
2468{
2469 return -EINVAL;
2470}
2471
2472static ssize_t
2473new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2474{
2475 /* buf must be %d:%d\n? giving major and minor numbers */
2476 /* The new device is added to the array.
2477 * If the array has a persistent superblock, we read the
2478 * superblock to initialise info and check validity.
2479 * Otherwise, only checking done is that in bind_rdev_to_array,
2480 * which mainly checks size.
2481 */
2482 char *e;
2483 int major = simple_strtoul(buf, &e, 10);
2484 int minor;
2485 dev_t dev;
2486 mdk_rdev_t *rdev;
2487 int err;
2488
2489 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2490 return -EINVAL;
2491 minor = simple_strtoul(e+1, &e, 10);
2492 if (*e && *e != '\n')
2493 return -EINVAL;
2494 dev = MKDEV(major, minor);
2495 if (major != MAJOR(dev) ||
2496 minor != MINOR(dev))
2497 return -EOVERFLOW;
2498
2499
2500 if (mddev->persistent) {
2501 rdev = md_import_device(dev, mddev->major_version,
2502 mddev->minor_version);
2503 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2504 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2505 mdk_rdev_t, same_set);
2506 err = super_types[mddev->major_version]
2507 .load_super(rdev, rdev0, mddev->minor_version);
2508 if (err < 0)
2509 goto out;
2510 }
2511 } else
2512 rdev = md_import_device(dev, -1, -1);
2513
2514 if (IS_ERR(rdev))
2515 return PTR_ERR(rdev);
2516 err = bind_rdev_to_array(rdev, mddev);
2517 out:
2518 if (err)
2519 export_rdev(rdev);
2520 return err ? err : len;
2521}
2522
2523static struct md_sysfs_entry md_new_device =
80ca3a44 2524__ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3b34380a 2525
9b1d1dac
PC		 2526static ssize_t
2527bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2528{
2529 char *end;
2530 unsigned long chunk, end_chunk;
2531
2532 if (!mddev->bitmap)
2533 goto out;
2534 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2535 while (*buf) {
2536 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2537 if (buf == end) break;
2538 if (*end == '-') { /* range */
2539 buf = end + 1;
2540 end_chunk = simple_strtoul(buf, &end, 0);
2541 if (buf == end) break;
2542 }
2543 if (*end && !isspace(*end)) break;
2544 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2545 buf = end;
2546 while (isspace(*buf)) buf++;
2547 }
2548 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2549out:
2550 return len;
2551}
2552
2553static struct md_sysfs_entry md_bitmap =
2554__ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2555
a35b0d69
N		 2556static ssize_t
2557size_show(mddev_t *mddev, char *page)
2558{
2559 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2560}
2561
2562static int update_size(mddev_t *mddev, unsigned long size);
2563
2564static ssize_t
2565size_store(mddev_t *mddev, const char *buf, size_t len)
2566{
2567 /* If array is inactive, we can reduce the component size, but
2568 * not increase it (except from 0).
2569 * If array is active, we can try an on-line resize
2570 */
2571 char *e;
2572 int err = 0;
2573 unsigned long long size = simple_strtoull(buf, &e, 10);
2574 if (!*buf || *buf == '\n' ||
2575 (*e && *e != '\n'))
2576 return -EINVAL;
2577
2578 if (mddev->pers) {
2579 err = update_size(mddev, size);
850b2b42 2580 md_update_sb(mddev, 1);
a35b0d69
N		 2581 } else {
2582 if (mddev->size == 0 ||
2583 mddev->size > size)
2584 mddev->size = size;
2585 else
2586 err = -ENOSPC;
2587 }
2588 return err ? err : len;
2589}
2590
2591static struct md_sysfs_entry md_size =
80ca3a44 2592__ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
a35b0d69 2593
8bb93aac
N		 2594
2595/* Metdata version.
2596 * This is either 'none' for arrays with externally managed metadata,
2597 * or N.M for internally known formats
2598 */
2599static ssize_t
2600metadata_show(mddev_t *mddev, char *page)
2601{
2602 if (mddev->persistent)
2603 return sprintf(page, "%d.%d\n",
2604 mddev->major_version, mddev->minor_version);
2605 else
2606 return sprintf(page, "none\n");
2607}
2608
2609static ssize_t
2610metadata_store(mddev_t *mddev, const char *buf, size_t len)
2611{
2612 int major, minor;
2613 char *e;
2614 if (!list_empty(&mddev->disks))
2615 return -EBUSY;
2616
2617 if (cmd_match(buf, "none")) {
2618 mddev->persistent = 0;
2619 mddev->major_version = 0;
2620 mddev->minor_version = 90;
2621 return len;
2622 }
2623 major = simple_strtoul(buf, &e, 10);
2624 if (e==buf || *e != '.')
2625 return -EINVAL;
2626 buf = e+1;
2627 minor = simple_strtoul(buf, &e, 10);
2628 if (e==buf || *e != '\n')
2629 return -EINVAL;
2630 if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
2631 super_types[major].name == NULL)
2632 return -ENOENT;
2633 mddev->major_version = major;
2634 mddev->minor_version = minor;
2635 mddev->persistent = 1;
2636 return len;
2637}
2638
2639static struct md_sysfs_entry md_metadata =
80ca3a44 2640__ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
8bb93aac 2641
24dd469d 2642static ssize_t
7eec314d 2643action_show(mddev_t *mddev, char *page)
24dd469d 2644{
7eec314d 2645 char *type = "idle";
31399d9e
N		 2646 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2647 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
ccfcc3c1
N		 2648 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2649 type = "reshape";
2650 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N		 2651 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2652 type = "resync";
2653 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2654 type = "check";
2655 else
2656 type = "repair";
2657 } else
2658 type = "recover";
2659 }
2660 return sprintf(page, "%s\n", type);
2661}
2662
2663static ssize_t
7eec314d 2664action_store(mddev_t *mddev, const char *page, size_t len)
24dd469d 2665{
7eec314d
N		 2666 if (!mddev->pers || !mddev->pers->sync_request)
2667 return -EINVAL;
2668
bce74dac 2669 if (cmd_match(page, "idle")) {
7eec314d
N		 2670 if (mddev->sync_thread) {
2671 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2672 md_unregister_thread(mddev->sync_thread);
2673 mddev->sync_thread = NULL;
2674 mddev->recovery = 0;
2675 }
03c902e1
N		 2676 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2677 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 2678 return -EBUSY;
03c902e1 2679 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
7eec314d 2680 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
16484bf5
N		 2681 else if (cmd_match(page, "reshape")) {
2682 int err;
2683 if (mddev->pers->start_reshape == NULL)
2684 return -EINVAL;
2685 err = mddev->pers->start_reshape(mddev);
2686 if (err)
2687 return err;
2688 } else {
bce74dac 2689 if (cmd_match(page, "check"))
7eec314d 2690 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2adc7d47 2691 else if (!cmd_match(page, "repair"))
7eec314d
N		 2692 return -EINVAL;
2693 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2694 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7eec314d 2695 }
03c902e1 2696 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d
N		 2697 md_wakeup_thread(mddev->thread);
2698 return len;
2699}
2700
9d88883e 2701static ssize_t
96de1e66 2702mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 2703{
2704 return sprintf(page, "%llu\n",
2705 (unsigned long long) mddev->resync_mismatches);
2706}
2707
80ca3a44
N		 2708static struct md_sysfs_entry md_scan_mode =
2709__ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 2710
96de1e66 2711
80ca3a44 2712static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 2713
88202a0c
N		 2714static ssize_t
2715sync_min_show(mddev_t *mddev, char *page)
2716{
2717 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2718 mddev->sync_speed_min ? "local": "system");
2719}
2720
2721static ssize_t
2722sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2723{
2724 int min;
2725 char *e;
2726 if (strncmp(buf, "system", 6)==0) {
2727 mddev->sync_speed_min = 0;
2728 return len;
2729 }
2730 min = simple_strtoul(buf, &e, 10);
2731 if (buf == e || (*e && *e != '\n') || min <= 0)
2732 return -EINVAL;
2733 mddev->sync_speed_min = min;
2734 return len;
2735}
2736
2737static struct md_sysfs_entry md_sync_min =
2738__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2739
2740static ssize_t
2741sync_max_show(mddev_t *mddev, char *page)
2742{
2743 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2744 mddev->sync_speed_max ? "local": "system");
2745}
2746
2747static ssize_t
2748sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2749{
2750 int max;
2751 char *e;
2752 if (strncmp(buf, "system", 6)==0) {
2753 mddev->sync_speed_max = 0;
2754 return len;
2755 }
2756 max = simple_strtoul(buf, &e, 10);
2757 if (buf == e || (*e && *e != '\n') || max <= 0)
2758 return -EINVAL;
2759 mddev->sync_speed_max = max;
2760 return len;
2761}
2762
2763static struct md_sysfs_entry md_sync_max =
2764__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2765
2766
2767static ssize_t
2768sync_speed_show(mddev_t *mddev, char *page)
2769{
2770 unsigned long resync, dt, db;
ff4e8d9a 2771 resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active));
88202a0c
N		 2772 dt = ((jiffies - mddev->resync_mark) / HZ);
2773 if (!dt) dt++;
2774 db = resync - (mddev->resync_mark_cnt);
2775 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2776}
2777
80ca3a44 2778static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
88202a0c
N		 2779
2780static ssize_t
2781sync_completed_show(mddev_t *mddev, char *page)
2782{
2783 unsigned long max_blocks, resync;
2784
2785 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2786 max_blocks = mddev->resync_max_sectors;
2787 else
2788 max_blocks = mddev->size << 1;
2789
2790 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2791 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2792}
2793
80ca3a44 2794static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
88202a0c 2795
e464eafd
N		 2796static ssize_t
2797suspend_lo_show(mddev_t *mddev, char *page)
2798{
2799 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
2800}
2801
2802static ssize_t
2803suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
2804{
2805 char *e;
2806 unsigned long long new = simple_strtoull(buf, &e, 10);
2807
2808 if (mddev->pers->quiesce == NULL)
2809 return -EINVAL;
2810 if (buf == e || (*e && *e != '\n'))
2811 return -EINVAL;
2812 if (new >= mddev->suspend_hi ||
2813 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
2814 mddev->suspend_lo = new;
2815 mddev->pers->quiesce(mddev, 2);
2816 return len;
2817 } else
2818 return -EINVAL;
2819}
2820static struct md_sysfs_entry md_suspend_lo =
2821__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
2822
2823
2824static ssize_t
2825suspend_hi_show(mddev_t *mddev, char *page)
2826{
2827 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
2828}
2829
2830static ssize_t
2831suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
2832{
2833 char *e;
2834 unsigned long long new = simple_strtoull(buf, &e, 10);
2835
2836 if (mddev->pers->quiesce == NULL)
2837 return -EINVAL;
2838 if (buf == e || (*e && *e != '\n'))
2839 return -EINVAL;
2840 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
2841 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
2842 mddev->suspend_hi = new;
2843 mddev->pers->quiesce(mddev, 1);
2844 mddev->pers->quiesce(mddev, 0);
2845 return len;
2846 } else
2847 return -EINVAL;
2848}
2849static struct md_sysfs_entry md_suspend_hi =
2850__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
2851
2852
eae1701f
N		 2853static struct attribute *md_default_attrs[] = {
2854 &md_level.attr,
d4dbd025 2855 &md_layout.attr,
eae1701f 2856 &md_raid_disks.attr,
3b34380a 2857 &md_chunk_size.attr,
a35b0d69 2858 &md_size.attr,
a94213b1 2859 &md_resync_start.attr,
8bb93aac 2860 &md_metadata.attr,
6d7ff738 2861 &md_new_device.attr,
16f17b39 2862 &md_safe_delay.attr,
9e653b63 2863 &md_array_state.attr,
411036fa
N		 2864 NULL,
2865};
2866
2867static struct attribute *md_redundancy_attrs[] = {
24dd469d 2868 &md_scan_mode.attr,
9d88883e 2869 &md_mismatches.attr,
88202a0c
N		 2870 &md_sync_min.attr,
2871 &md_sync_max.attr,
2872 &md_sync_speed.attr,
2873 &md_sync_completed.attr,
e464eafd
N		 2874 &md_suspend_lo.attr,
2875 &md_suspend_hi.attr,
9b1d1dac 2876 &md_bitmap.attr,
eae1701f
N		 2877 NULL,
2878};
411036fa
N		 2879static struct attribute_group md_redundancy_group = {
2880 .name = NULL,
2881 .attrs = md_redundancy_attrs,
2882};
2883
eae1701f
N		 2884
2885static ssize_t
2886md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2887{
2888 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2889 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2890 ssize_t rv;
eae1701f
N		 2891
2892 if (!entry->show)
2893 return -EIO;
5dc5cf7d
IM		 2894 rv = mddev_lock(mddev);
2895 if (!rv) {
2896 rv = entry->show(mddev, page);
2897 mddev_unlock(mddev);
2898 }
96de1e66 2899 return rv;
eae1701f
N		 2900}
2901
2902static ssize_t
2903md_attr_store(struct kobject *kobj, struct attribute *attr,
2904 const char *page, size_t length)
2905{
2906 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2907 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2908 ssize_t rv;
eae1701f
N		 2909
2910 if (!entry->store)
2911 return -EIO;
67463acb
N		 2912 if (!capable(CAP_SYS_ADMIN))
2913 return -EACCES;
5dc5cf7d
IM		 2914 rv = mddev_lock(mddev);
2915 if (!rv) {
2916 rv = entry->store(mddev, page, length);
2917 mddev_unlock(mddev);
2918 }
96de1e66 2919 return rv;
eae1701f
N		 2920}
2921
2922static void md_free(struct kobject *ko)
2923{
2924 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2925 kfree(mddev);
2926}
2927
2928static struct sysfs_ops md_sysfs_ops = {
2929 .show = md_attr_show,
2930 .store = md_attr_store,
2931};
2932static struct kobj_type md_ktype = {
2933 .release = md_free,
2934 .sysfs_ops = &md_sysfs_ops,
2935 .default_attrs = md_default_attrs,
2936};
2937
1da177e4
LT		 2938int mdp_major = 0;
2939
2940static struct kobject *md_probe(dev_t dev, int *part, void *data)
2941{
48c9c27b 2942 static DEFINE_MUTEX(disks_mutex);
1da177e4
LT		 2943 mddev_t *mddev = mddev_find(dev);
2944 struct gendisk *disk;
2945 int partitioned = (MAJOR(dev) != MD_MAJOR);
2946 int shift = partitioned ? MdpMinorShift : 0;
2947 int unit = MINOR(dev) >> shift;
2948
2949 if (!mddev)
2950 return NULL;
2951
48c9c27b 2952 mutex_lock(&disks_mutex);
1da177e4 2953 if (mddev->gendisk) {
48c9c27b 2954 mutex_unlock(&disks_mutex);
1da177e4
LT		 2955 mddev_put(mddev);
2956 return NULL;
2957 }
2958 disk = alloc_disk(1 << shift);
2959 if (!disk) {
48c9c27b 2960 mutex_unlock(&disks_mutex);
1da177e4
LT		 2961 mddev_put(mddev);
2962 return NULL;
2963 }
2964 disk->major = MAJOR(dev);
2965 disk->first_minor = unit << shift;
ce7b0f46 2966 if (partitioned)
1da177e4 2967 sprintf(disk->disk_name, "md_d%d", unit);
ce7b0f46 2968 else
1da177e4 2969 sprintf(disk->disk_name, "md%d", unit);
1da177e4
LT		 2970 disk->fops = &md_fops;
2971 disk->private_data = mddev;
2972 disk->queue = mddev->queue;
2973 add_disk(disk);
2974 mddev->gendisk = disk;
48c9c27b 2975 mutex_unlock(&disks_mutex);
9c791977 2976 mddev->kobj.parent = &disk->kobj;
eae1701f
N		 2977 mddev->kobj.k_name = NULL;
2978 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
2979 mddev->kobj.ktype = &md_ktype;
2980 kobject_register(&mddev->kobj);
1da177e4
LT		 2981 return NULL;
2982}
2983
1da177e4
LT		 2984static void md_safemode_timeout(unsigned long data)
2985{
2986 mddev_t *mddev = (mddev_t *) data;
2987
2988 mddev->safemode = 1;
2989 md_wakeup_thread(mddev->thread);
2990}
2991
6ff8d8ec 2992static int start_dirty_degraded;
1da177e4
LT		 2993
2994static int do_md_run(mddev_t * mddev)
2995{
2604b703 2996 int err;
1da177e4
LT		 2997 int chunk_size;
2998 struct list_head *tmp;
2999 mdk_rdev_t *rdev;
3000 struct gendisk *disk;
2604b703 3001 struct mdk_personality *pers;
1da177e4
LT		 3002 char b[BDEVNAME_SIZE];
3003
a757e64c
N		 3004 if (list_empty(&mddev->disks))
3005 /* cannot run an array with no devices.. */
1da177e4 3006 return -EINVAL;
1da177e4
LT		 3007
3008 if (mddev->pers)
3009 return -EBUSY;
3010
3011 /*
3012 * Analyze all RAID superblock(s)
3013 */
a757e64c
N		 3014 if (!mddev->raid_disks)
3015 analyze_sbs(mddev);
1da177e4
LT		 3016
3017 chunk_size = mddev->chunk_size;
2604b703
N		 3018
3019 if (chunk_size) {
1da177e4
LT		 3020 if (chunk_size > MAX_CHUNK_SIZE) {
3021 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3022 chunk_size, MAX_CHUNK_SIZE);
3023 return -EINVAL;
3024 }
3025 /*
3026 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3027 */
3028 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 3029 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 3030 return -EINVAL;
3031 }
3032 if (chunk_size < PAGE_SIZE) {
3033 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
3034 chunk_size, PAGE_SIZE);
3035 return -EINVAL;
3036 }
3037
3038 /* devices must have minimum size of one chunk */
3039 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 3040 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3041 continue;
3042 if (rdev->size < chunk_size / 1024) {
3043 printk(KERN_WARNING
3044 "md: Dev %s smaller than chunk_size:"
3045 " %lluk < %dk\n",
3046 bdevname(rdev->bdev,b),
3047 (unsigned long long)rdev->size,
3048 chunk_size / 1024);
3049 return -EINVAL;
3050 }
3051 }
3052 }
3053
1da177e4 3054#ifdef CONFIG_KMOD
d9d166c2
N		 3055 if (mddev->level != LEVEL_NONE)
3056 request_module("md-level-%d", mddev->level);
3057 else if (mddev->clevel[0])
3058 request_module("md-%s", mddev->clevel);
1da177e4
LT		 3059#endif
3060
3061 /*
3062 * Drop all container device buffers, from now on
3063 * the only valid external interface is through the md
3064 * device.
3065 * Also find largest hardsector size
3066 */
3067 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 3068 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3069 continue;
3070 sync_blockdev(rdev->bdev);
3071 invalidate_bdev(rdev->bdev, 0);
3072 }
3073
3074 md_probe(mddev->unit, NULL, NULL);
3075 disk = mddev->gendisk;
3076 if (!disk)
3077 return -ENOMEM;
3078
3079 spin_lock(&pers_lock);
d9d166c2 3080 pers = find_pers(mddev->level, mddev->clevel);
2604b703 3081 if (!pers || !try_module_get(pers->owner)) {
1da177e4 3082 spin_unlock(&pers_lock);
d9d166c2
N		 3083 if (mddev->level != LEVEL_NONE)
3084 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3085 mddev->level);
3086 else
3087 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3088 mddev->clevel);
1da177e4
LT		 3089 return -EINVAL;
3090 }
2604b703 3091 mddev->pers = pers;
1da177e4 3092 spin_unlock(&pers_lock);
d9d166c2
N		 3093 mddev->level = pers->level;
3094 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
1da177e4 3095
f6705578 3096 if (mddev->reshape_position != MaxSector &&
63c70c4f 3097 pers->start_reshape == NULL) {
f6705578
N		 3098 /* This personality cannot handle reshaping... */
3099 mddev->pers = NULL;
3100 module_put(pers->owner);
3101 return -EINVAL;
3102 }
3103
657390d2 3104 mddev->recovery = 0;
1da177e4 3105 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 3106 mddev->barriers_work = 1;
6ff8d8ec 3107 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 3108
f91de92e
N		 3109 if (start_readonly)
3110 mddev->ro = 2; /* read-only, but switch on first write */
3111
b15c2e57
N		 3112 err = mddev->pers->run(mddev);
3113 if (!err && mddev->pers->sync_request) {
3114 err = bitmap_create(mddev);
3115 if (err) {
3116 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3117 mdname(mddev), err);
3118 mddev->pers->stop(mddev);
3119 }
3120 }
1da177e4
LT		 3121 if (err) {
3122 printk(KERN_ERR "md: pers->run() failed ...\n");
3123 module_put(mddev->pers->owner);
3124 mddev->pers = NULL;
32a7627c
N		 3125 bitmap_destroy(mddev);
3126 return err;
1da177e4 3127 }
411036fa
N		 3128 if (mddev->pers->sync_request)
3129 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
fd9d49ca
N		 3130 else if (mddev->ro == 2) /* auto-readonly not meaningful */
3131 mddev->ro = 0;
3132
1da177e4
LT		 3133 atomic_set(&mddev->writes_pending,0);
3134 mddev->safemode = 0;
3135 mddev->safemode_timer.function = md_safemode_timeout;
3136 mddev->safemode_timer.data = (unsigned long) mddev;
16f17b39 3137 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
1da177e4 3138 mddev->in_sync = 1;
86e6ffdd
N		 3139
3140 ITERATE_RDEV(mddev,rdev,tmp)
3141 if (rdev->raid_disk >= 0) {
3142 char nm[20];
3143 sprintf(nm, "rd%d", rdev->raid_disk);
3144 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
3145 }
1da177e4
LT		 3146
3147 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3148
850b2b42
N		 3149 if (mddev->flags)
3150 md_update_sb(mddev, 0);
1da177e4
LT		 3151
3152 set_capacity(disk, mddev->array_size<<1);
3153
3154 /* If we call blk_queue_make_request here, it will
3155 * re-initialise max_sectors etc which may have been
3156 * refined inside -> run. So just set the bits we need to set.
3157 * Most initialisation happended when we called
3158 * blk_queue_make_request(..., md_fail_request)
3159 * earlier.
3160 */
3161 mddev->queue->queuedata = mddev;
3162 mddev->queue->make_request_fn = mddev->pers->make_request;
3163
5fd6c1dc
N		 3164 /* If there is a partially-recovered drive we need to
3165 * start recovery here. If we leave it to md_check_recovery,
3166 * it will remove the drives and not do the right thing
3167 */
0b8c9de0 3168 if (mddev->degraded && !mddev->sync_thread) {
5fd6c1dc
N		 3169 struct list_head *rtmp;
3170 int spares = 0;
3171 ITERATE_RDEV(mddev,rdev,rtmp)
3172 if (rdev->raid_disk >= 0 &&
3173 !test_bit(In_sync, &rdev->flags) &&
3174 !test_bit(Faulty, &rdev->flags))
3175 /* complete an interrupted recovery */
3176 spares++;
3177 if (spares && mddev->pers->sync_request) {
3178 mddev->recovery = 0;
3179 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3180 mddev->sync_thread = md_register_thread(md_do_sync,
3181 mddev,
3182 "%s_resync");
3183 if (!mddev->sync_thread) {
3184 printk(KERN_ERR "%s: could not start resync"
3185 " thread...\n",
3186 mdname(mddev));
3187 /* leave the spares where they are, it shouldn't hurt */
3188 mddev->recovery = 0;
0b8c9de0 3189 }
5fd6c1dc
N		 3190 }
3191 }
0b8c9de0
N		 3192 md_wakeup_thread(mddev->thread);
3193 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5fd6c1dc 3194
1da177e4 3195 mddev->changed = 1;
d7603b7e 3196 md_new_event(mddev);
1da177e4
LT		 3197 return 0;
3198}
3199
3200static int restart_array(mddev_t *mddev)
3201{
3202 struct gendisk *disk = mddev->gendisk;
3203 int err;
3204
3205 /*
3206 * Complain if it has no devices
3207 */
3208 err = -ENXIO;
3209 if (list_empty(&mddev->disks))
3210 goto out;
3211
3212 if (mddev->pers) {
3213 err = -EBUSY;
3214 if (!mddev->ro)
3215 goto out;
3216
3217 mddev->safemode = 0;
3218 mddev->ro = 0;
3219 set_disk_ro(disk, 0);
3220
3221 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3222 mdname(mddev));
3223 /*
3224 * Kick recovery or resync if necessary
3225 */
3226 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3227 md_wakeup_thread(mddev->thread);
5fd6c1dc 3228 md_wakeup_thread(mddev->sync_thread);
1da177e4 3229 err = 0;
9e653b63 3230 } else
1da177e4 3231 err = -EINVAL;
1da177e4
LT		 3232
3233out:
3234 return err;
3235}
3236
acc55e22
N		 3237/* similar to deny_write_access, but accounts for our holding a reference
3238 * to the file ourselves */
3239static int deny_bitmap_write_access(struct file * file)
3240{
3241 struct inode *inode = file->f_mapping->host;
3242
3243 spin_lock(&inode->i_lock);
3244 if (atomic_read(&inode->i_writecount) > 1) {
3245 spin_unlock(&inode->i_lock);
3246 return -ETXTBSY;
3247 }
3248 atomic_set(&inode->i_writecount, -1);
3249 spin_unlock(&inode->i_lock);
3250
3251 return 0;
3252}
3253
3254static void restore_bitmap_write_access(struct file *file)
3255{
3256 struct inode *inode = file->f_mapping->host;
3257
3258 spin_lock(&inode->i_lock);
3259 atomic_set(&inode->i_writecount, 1);
3260 spin_unlock(&inode->i_lock);
3261}
3262
9e653b63
N		 3263/* mode:
3264 * 0 - completely stop and dis-assemble array
3265 * 1 - switch to readonly
3266 * 2 - stop but do not disassemble array
3267 */
3268static int do_md_stop(mddev_t * mddev, int mode)
1da177e4
LT		 3269{
3270 int err = 0;
3271 struct gendisk *disk = mddev->gendisk;
3272
3273 if (mddev->pers) {
3274 if (atomic_read(&mddev->active)>2) {
3275 printk("md: %s still in use.\n",mdname(mddev));
3276 return -EBUSY;
3277 }
3278
3279 if (mddev->sync_thread) {
5fd6c1dc 3280 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4
LT		 3281 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3282 md_unregister_thread(mddev->sync_thread);
3283 mddev->sync_thread = NULL;
3284 }
3285
3286 del_timer_sync(&mddev->safemode_timer);
3287
3288 invalidate_partition(disk, 0);
3289
9e653b63
N		 3290 switch(mode) {
3291 case 1: /* readonly */
1da177e4 3292 err = -ENXIO;
f91de92e 3293 if (mddev->ro==1)
1da177e4
LT		 3294 goto out;
3295 mddev->ro = 1;
9e653b63
N		 3296 break;
3297 case 0: /* disassemble */
3298 case 2: /* stop */
6b8b3e8a 3299 bitmap_flush(mddev);
a9701a30 3300 md_super_wait(mddev);
1da177e4
LT		 3301 if (mddev->ro)
3302 set_disk_ro(disk, 0);
3303 blk_queue_make_request(mddev->queue, md_fail_request);
3304 mddev->pers->stop(mddev);
411036fa
N		 3305 if (mddev->pers->sync_request)
3306 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3307
1da177e4
LT		 3308 module_put(mddev->pers->owner);
3309 mddev->pers = NULL;
3310 if (mddev->ro)
3311 mddev->ro = 0;
3312 }
850b2b42 3313 if (!mddev->in_sync || mddev->flags) {
1da177e4
LT		 3314 /* mark array as shutdown cleanly */
3315 mddev->in_sync = 1;
850b2b42 3316 md_update_sb(mddev, 1);
1da177e4 3317 }
9e653b63 3318 if (mode == 1)
1da177e4 3319 set_disk_ro(disk, 1);
5fd6c1dc 3320 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4 3321 }
32a7627c 3322
1da177e4
LT		 3323 /*
3324 * Free resources if final stop
3325 */
9e653b63 3326 if (mode == 0) {
86e6ffdd
N		 3327 mdk_rdev_t *rdev;
3328 struct list_head *tmp;
1da177e4
LT		 3329 struct gendisk *disk;
3330 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3331
978f946b
N		 3332 bitmap_destroy(mddev);
3333 if (mddev->bitmap_file) {
acc55e22 3334 restore_bitmap_write_access(mddev->bitmap_file);
978f946b
N		 3335 fput(mddev->bitmap_file);
3336 mddev->bitmap_file = NULL;
3337 }
3338 mddev->bitmap_offset = 0;
3339
86e6ffdd
N		 3340 ITERATE_RDEV(mddev,rdev,tmp)
3341 if (rdev->raid_disk >= 0) {
3342 char nm[20];
3343 sprintf(nm, "rd%d", rdev->raid_disk);
3344 sysfs_remove_link(&mddev->kobj, nm);
3345 }
3346
1da177e4
LT		 3347 export_array(mddev);
3348
3349 mddev->array_size = 0;
9e653b63
N		 3350 mddev->size = 0;
3351 mddev->raid_disks = 0;
a94213b1 3352 mddev->recovery_cp = 0;
9e653b63 3353
1da177e4
LT		 3354 disk = mddev->gendisk;
3355 if (disk)
3356 set_capacity(disk, 0);
3357 mddev->changed = 1;
a8a55c38 3358 } else if (mddev->pers)
1da177e4
LT		 3359 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3360 mdname(mddev));
3361 err = 0;
d7603b7e 3362 md_new_event(mddev);
1da177e4
LT		 3363out:
3364 return err;
3365}
3366
3367static void autorun_array(mddev_t *mddev)
3368{
3369 mdk_rdev_t *rdev;
3370 struct list_head *tmp;
3371 int err;
3372
a757e64c 3373 if (list_empty(&mddev->disks))
1da177e4 3374 return;
1da177e4
LT		 3375
3376 printk(KERN_INFO "md: running: ");
3377
3378 ITERATE_RDEV(mddev,rdev,tmp) {
3379 char b[BDEVNAME_SIZE];
3380 printk("<%s>", bdevname(rdev->bdev,b));
3381 }
3382 printk("\n");
3383
3384 err = do_md_run (mddev);
3385 if (err) {
3386 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3387 do_md_stop (mddev, 0);
3388 }
3389}
3390
3391/*
3392 * lets try to run arrays based on all disks that have arrived
3393 * until now. (those are in pending_raid_disks)
3394 *
3395 * the method: pick the first pending disk, collect all disks with
3396 * the same UUID, remove all from the pending list and put them into
3397 * the 'same_array' list. Then order this list based on superblock
3398 * update time (freshest comes first), kick out 'old' disks and
3399 * compare superblocks. If everything's fine then run it.
3400 *
3401 * If "unit" is allocated, then bump its reference count
3402 */
3403static void autorun_devices(int part)
3404{
1da177e4
LT		 3405 struct list_head *tmp;
3406 mdk_rdev_t *rdev0, *rdev;
3407 mddev_t *mddev;
3408 char b[BDEVNAME_SIZE];
3409
3410 printk(KERN_INFO "md: autorun ...\n");
3411 while (!list_empty(&pending_raid_disks)) {
3412 dev_t dev;
ad01c9e3 3413 LIST_HEAD(candidates);
1da177e4
LT		 3414 rdev0 = list_entry(pending_raid_disks.next,
3415 mdk_rdev_t, same_set);
3416
3417 printk(KERN_INFO "md: considering %s ...\n",
3418 bdevname(rdev0->bdev,b));
3419 INIT_LIST_HEAD(&candidates);
3420 ITERATE_RDEV_PENDING(rdev,tmp)
3421 if (super_90_load(rdev, rdev0, 0) >= 0) {
3422 printk(KERN_INFO "md: adding %s ...\n",
3423 bdevname(rdev->bdev,b));
3424 list_move(&rdev->same_set, &candidates);
3425 }
3426 /*
3427 * now we have a set of devices, with all of them having
3428 * mostly sane superblocks. It's time to allocate the
3429 * mddev.
3430 */
3431 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
3432 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3433 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3434 break;
3435 }
3436 if (part)
3437 dev = MKDEV(mdp_major,
3438 rdev0->preferred_minor << MdpMinorShift);
3439 else
3440 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3441
3442 md_probe(dev, NULL, NULL);
3443 mddev = mddev_find(dev);
3444 if (!mddev) {
3445 printk(KERN_ERR
3446 "md: cannot allocate memory for md drive.\n");
3447 break;
3448 }
3449 if (mddev_lock(mddev))
3450 printk(KERN_WARNING "md: %s locked, cannot run\n",
3451 mdname(mddev));
3452 else if (mddev->raid_disks || mddev->major_version
3453 || !list_empty(&mddev->disks)) {
3454 printk(KERN_WARNING
3455 "md: %s already running, cannot run %s\n",
3456 mdname(mddev), bdevname(rdev0->bdev,b));
3457 mddev_unlock(mddev);
3458 } else {
3459 printk(KERN_INFO "md: created %s\n", mdname(mddev));
3460 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
3461 list_del_init(&rdev->same_set);
3462 if (bind_rdev_to_array(rdev, mddev))
3463 export_rdev(rdev);
3464 }
3465 autorun_array(mddev);
3466 mddev_unlock(mddev);
3467 }
3468 /* on success, candidates will be empty, on error
3469 * it won't...
3470 */
3471 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
3472 export_rdev(rdev);
3473 mddev_put(mddev);
3474 }
3475 printk(KERN_INFO "md: ... autorun DONE.\n");
3476}
3477
1da177e4
LT		 3478static int get_version(void __user * arg)
3479{
3480 mdu_version_t ver;
3481
3482 ver.major = MD_MAJOR_VERSION;
3483 ver.minor = MD_MINOR_VERSION;
3484 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3485
3486 if (copy_to_user(arg, &ver, sizeof(ver)))
3487 return -EFAULT;
3488
3489 return 0;
3490}
3491
3492static int get_array_info(mddev_t * mddev, void __user * arg)
3493{
3494 mdu_array_info_t info;
3495 int nr,working,active,failed,spare;
3496 mdk_rdev_t *rdev;
3497 struct list_head *tmp;
3498
3499 nr=working=active=failed=spare=0;
3500 ITERATE_RDEV(mddev,rdev,tmp) {
3501 nr++;
b2d444d7 3502 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3503 failed++;
3504 else {
3505 working++;
b2d444d7 3506 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 3507 active++;
3508 else
3509 spare++;
3510 }
3511 }
3512
3513 info.major_version = mddev->major_version;
3514 info.minor_version = mddev->minor_version;
3515 info.patch_version = MD_PATCHLEVEL_VERSION;
3516 info.ctime = mddev->ctime;
3517 info.level = mddev->level;
3518 info.size = mddev->size;
284ae7ca
N		 3519 if (info.size != mddev->size) /* overflow */
3520 info.size = -1;
1da177e4
LT		 3521 info.nr_disks = nr;
3522 info.raid_disks = mddev->raid_disks;
3523 info.md_minor = mddev->md_minor;
3524 info.not_persistent= !mddev->persistent;
3525
3526 info.utime = mddev->utime;
3527 info.state = 0;
3528 if (mddev->in_sync)
3529 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 3530 if (mddev->bitmap && mddev->bitmap_offset)
3531 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 3532 info.active_disks = active;
3533 info.working_disks = working;
3534 info.failed_disks = failed;
3535 info.spare_disks = spare;
3536
3537 info.layout = mddev->layout;
3538 info.chunk_size = mddev->chunk_size;
3539
3540 if (copy_to_user(arg, &info, sizeof(info)))
3541 return -EFAULT;
3542
3543 return 0;
3544}
3545
87162a28 3546static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 3547{
3548 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3549 char *ptr, *buf = NULL;
3550 int err = -ENOMEM;
3551
3552 file = kmalloc(sizeof(*file), GFP_KERNEL);
3553 if (!file)
3554 goto out;
3555
3556 /* bitmap disabled, zero the first byte and copy out */
3557 if (!mddev->bitmap || !mddev->bitmap->file) {
3558 file->pathname[0] = '\0';
3559 goto copy_out;
3560 }
3561
3562 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3563 if (!buf)
3564 goto out;
3565
3566 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3567 if (!ptr)
3568 goto out;
3569
3570 strcpy(file->pathname, ptr);
3571
3572copy_out:
3573 err = 0;
3574 if (copy_to_user(arg, file, sizeof(*file)))
3575 err = -EFAULT;
3576out:
3577 kfree(buf);
3578 kfree(file);
3579 return err;
3580}
3581
1da177e4
LT		 3582static int get_disk_info(mddev_t * mddev, void __user * arg)
3583{
3584 mdu_disk_info_t info;
3585 unsigned int nr;
3586 mdk_rdev_t *rdev;
3587
3588 if (copy_from_user(&info, arg, sizeof(info)))
3589 return -EFAULT;
3590
3591 nr = info.number;
3592
3593 rdev = find_rdev_nr(mddev, nr);
3594 if (rdev) {
3595 info.major = MAJOR(rdev->bdev->bd_dev);
3596 info.minor = MINOR(rdev->bdev->bd_dev);
3597 info.raid_disk = rdev->raid_disk;
3598 info.state = 0;
b2d444d7 3599 if (test_bit(Faulty, &rdev->flags))
1da177e4 3600 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 3601 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 3602 info.state |= (1<<MD_DISK_ACTIVE);
3603 info.state |= (1<<MD_DISK_SYNC);
3604 }
8ddf9efe
N		 3605 if (test_bit(WriteMostly, &rdev->flags))
3606 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 3607 } else {
3608 info.major = info.minor = 0;
3609 info.raid_disk = -1;
3610 info.state = (1<<MD_DISK_REMOVED);
3611 }
3612
3613 if (copy_to_user(arg, &info, sizeof(info)))
3614 return -EFAULT;
3615
3616 return 0;
3617}
3618
3619static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3620{
3621 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3622 mdk_rdev_t *rdev;
3623 dev_t dev = MKDEV(info->major,info->minor);
3624
3625 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3626 return -EOVERFLOW;
3627
3628 if (!mddev->raid_disks) {
3629 int err;
3630 /* expecting a device which has a superblock */
3631 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3632 if (IS_ERR(rdev)) {
3633 printk(KERN_WARNING
3634 "md: md_import_device returned %ld\n",
3635 PTR_ERR(rdev));
3636 return PTR_ERR(rdev);
3637 }
3638 if (!list_empty(&mddev->disks)) {
3639 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3640 mdk_rdev_t, same_set);
3641 int err = super_types[mddev->major_version]
3642 .load_super(rdev, rdev0, mddev->minor_version);
3643 if (err < 0) {
3644 printk(KERN_WARNING
3645 "md: %s has different UUID to %s\n",
3646 bdevname(rdev->bdev,b),
3647 bdevname(rdev0->bdev,b2));
3648 export_rdev(rdev);
3649 return -EINVAL;
3650 }
3651 }
3652 err = bind_rdev_to_array(rdev, mddev);
3653 if (err)
3654 export_rdev(rdev);
3655 return err;
3656 }
3657
3658 /*
3659 * add_new_disk can be used once the array is assembled
3660 * to add "hot spares". They must already have a superblock
3661 * written
3662 */
3663 if (mddev->pers) {
3664 int err;
3665 if (!mddev->pers->hot_add_disk) {
3666 printk(KERN_WARNING
3667 "%s: personality does not support diskops!\n",
3668 mdname(mddev));
3669 return -EINVAL;
3670 }
7b1e35f6
N		 3671 if (mddev->persistent)
3672 rdev = md_import_device(dev, mddev->major_version,
3673 mddev->minor_version);
3674 else
3675 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 3676 if (IS_ERR(rdev)) {
3677 printk(KERN_WARNING
3678 "md: md_import_device returned %ld\n",
3679 PTR_ERR(rdev));
3680 return PTR_ERR(rdev);
3681 }
41158c7e
N		 3682 /* set save_raid_disk if appropriate */
3683 if (!mddev->persistent) {
3684 if (info->state & (1<<MD_DISK_SYNC) &&
3685 info->raid_disk < mddev->raid_disks)
3686 rdev->raid_disk = info->raid_disk;
3687 else
3688 rdev->raid_disk = -1;
3689 } else
3690 super_types[mddev->major_version].
3691 validate_super(mddev, rdev);
3692 rdev->saved_raid_disk = rdev->raid_disk;
3693
b2d444d7 3694 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 3695 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3696 set_bit(WriteMostly, &rdev->flags);
3697
1da177e4
LT		 3698 rdev->raid_disk = -1;
3699 err = bind_rdev_to_array(rdev, mddev);
7c7546cc
N		 3700 if (!err && !mddev->pers->hot_remove_disk) {
3701 /* If there is hot_add_disk but no hot_remove_disk
3702 * then added disks for geometry changes,
3703 * and should be added immediately.
3704 */
3705 super_types[mddev->major_version].
3706 validate_super(mddev, rdev);
3707 err = mddev->pers->hot_add_disk(mddev, rdev);
3708 if (err)
3709 unbind_rdev_from_array(rdev);
3710 }
1da177e4
LT		 3711 if (err)
3712 export_rdev(rdev);
c361777f
N		 3713
3714 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 3715 md_wakeup_thread(mddev->thread);
1da177e4
LT		 3716 return err;
3717 }
3718
3719 /* otherwise, add_new_disk is only allowed
3720 * for major_version==0 superblocks
3721 */
3722 if (mddev->major_version != 0) {
3723 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3724 mdname(mddev));
3725 return -EINVAL;
3726 }
3727
3728 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3729 int err;
3730 rdev = md_import_device (dev, -1, 0);
3731 if (IS_ERR(rdev)) {
3732 printk(KERN_WARNING
3733 "md: error, md_import_device() returned %ld\n",
3734 PTR_ERR(rdev));
3735 return PTR_ERR(rdev);
3736 }
3737 rdev->desc_nr = info->number;
3738 if (info->raid_disk < mddev->raid_disks)
3739 rdev->raid_disk = info->raid_disk;
3740 else
3741 rdev->raid_disk = -1;
3742
b2d444d7
N		 3743 rdev->flags = 0;
3744
1da177e4 3745 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 3746 if (info->state & (1<<MD_DISK_SYNC))
3747 set_bit(In_sync, &rdev->flags);
1da177e4 3748
8ddf9efe
N		 3749 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3750 set_bit(WriteMostly, &rdev->flags);
3751
1da177e4
LT		 3752 if (!mddev->persistent) {
3753 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3754 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3755 } else
3756 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3757 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3758
2bf071bf
N		 3759 err = bind_rdev_to_array(rdev, mddev);
3760 if (err) {
3761 export_rdev(rdev);
3762 return err;
3763 }
1da177e4
LT		 3764 }
3765
3766 return 0;
3767}
3768
3769static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3770{
3771 char b[BDEVNAME_SIZE];
3772 mdk_rdev_t *rdev;
3773
3774 if (!mddev->pers)
3775 return -ENODEV;
3776
3777 rdev = find_rdev(mddev, dev);
3778 if (!rdev)
3779 return -ENXIO;
3780
3781 if (rdev->raid_disk >= 0)
3782 goto busy;
3783
3784 kick_rdev_from_array(rdev);
850b2b42 3785 md_update_sb(mddev, 1);
d7603b7e 3786 md_new_event(mddev);
1da177e4
LT		 3787
3788 return 0;
3789busy:
3790 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3791 bdevname(rdev->bdev,b), mdname(mddev));
3792 return -EBUSY;
3793}
3794
3795static int hot_add_disk(mddev_t * mddev, dev_t dev)
3796{
3797 char b[BDEVNAME_SIZE];
3798 int err;
3799 unsigned int size;
3800 mdk_rdev_t *rdev;
3801
3802 if (!mddev->pers)
3803 return -ENODEV;
3804
3805 if (mddev->major_version != 0) {
3806 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3807 " version-0 superblocks.\n",
3808 mdname(mddev));
3809 return -EINVAL;
3810 }
3811 if (!mddev->pers->hot_add_disk) {
3812 printk(KERN_WARNING
3813 "%s: personality does not support diskops!\n",
3814 mdname(mddev));
3815 return -EINVAL;
3816 }
3817
3818 rdev = md_import_device (dev, -1, 0);
3819 if (IS_ERR(rdev)) {
3820 printk(KERN_WARNING
3821 "md: error, md_import_device() returned %ld\n",
3822 PTR_ERR(rdev));
3823 return -EINVAL;
3824 }
3825
3826 if (mddev->persistent)
3827 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3828 else
3829 rdev->sb_offset =
3830 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3831
3832 size = calc_dev_size(rdev, mddev->chunk_size);
3833 rdev->size = size;
3834
b2d444d7 3835 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 3836 printk(KERN_WARNING
3837 "md: can not hot-add faulty %s disk to %s!\n",
3838 bdevname(rdev->bdev,b), mdname(mddev));
3839 err = -EINVAL;
3840 goto abort_export;
3841 }
b2d444d7 3842 clear_bit(In_sync, &rdev->flags);
1da177e4 3843 rdev->desc_nr = -1;
2bf071bf
N		 3844 err = bind_rdev_to_array(rdev, mddev);
3845 if (err)
3846 goto abort_export;
1da177e4
LT		 3847
3848 /*
3849 * The rest should better be atomic, we can have disk failures
3850 * noticed in interrupt contexts ...
3851 */
3852
3853 if (rdev->desc_nr == mddev->max_disks) {
3854 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
3855 mdname(mddev));
3856 err = -EBUSY;
3857 goto abort_unbind_export;
3858 }
3859
3860 rdev->raid_disk = -1;
3861
850b2b42 3862 md_update_sb(mddev, 1);
1da177e4
LT		 3863
3864 /*
3865 * Kick recovery, maybe this spare has to be added to the
3866 * array immediately.
3867 */
3868 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3869 md_wakeup_thread(mddev->thread);
d7603b7e 3870 md_new_event(mddev);
1da177e4
LT		 3871 return 0;
3872
3873abort_unbind_export:
3874 unbind_rdev_from_array(rdev);
3875
3876abort_export:
3877 export_rdev(rdev);
3878 return err;
3879}
3880
32a7627c
N		 3881static int set_bitmap_file(mddev_t *mddev, int fd)
3882{
3883 int err;
3884
36fa3063
N		 3885 if (mddev->pers) {
3886 if (!mddev->pers->quiesce)
3887 return -EBUSY;
3888 if (mddev->recovery || mddev->sync_thread)
3889 return -EBUSY;
3890 /* we should be able to change the bitmap.. */
3891 }
32a7627c 3892
32a7627c 3893
36fa3063
N		 3894 if (fd >= 0) {
3895 if (mddev->bitmap)
3896 return -EEXIST; /* cannot add when bitmap is present */
3897 mddev->bitmap_file = fget(fd);
32a7627c 3898
36fa3063
N		 3899 if (mddev->bitmap_file == NULL) {
3900 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
3901 mdname(mddev));
3902 return -EBADF;
3903 }
3904
3905 err = deny_bitmap_write_access(mddev->bitmap_file);
3906 if (err) {
3907 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
3908 mdname(mddev));
3909 fput(mddev->bitmap_file);
3910 mddev->bitmap_file = NULL;
3911 return err;
3912 }
a654b9d8 3913 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 3914 } else if (mddev->bitmap == NULL)
3915 return -ENOENT; /* cannot remove what isn't there */
3916 err = 0;
3917 if (mddev->pers) {
3918 mddev->pers->quiesce(mddev, 1);
3919 if (fd >= 0)
3920 err = bitmap_create(mddev);
d7375ab3 3921 if (fd < 0 || err) {
36fa3063 3922 bitmap_destroy(mddev);
d7375ab3
N		 3923 fd = -1; /* make sure to put the file */
3924 }
36fa3063 3925 mddev->pers->quiesce(mddev, 0);
d7375ab3
N		 3926 }
3927 if (fd < 0) {
acc55e22
N		 3928 if (mddev->bitmap_file) {
3929 restore_bitmap_write_access(mddev->bitmap_file);
36fa3063 3930 fput(mddev->bitmap_file);
acc55e22 3931 }
36fa3063
N		 3932 mddev->bitmap_file = NULL;
3933 }
3934
32a7627c
N		 3935 return err;
3936}
3937
1da177e4
LT		 3938/*
3939 * set_array_info is used two different ways
3940 * The original usage is when creating a new array.
3941 * In this usage, raid_disks is > 0 and it together with
3942 * level, size, not_persistent,layout,chunksize determine the
3943 * shape of the array.
3944 * This will always create an array with a type-0.90.0 superblock.
3945 * The newer usage is when assembling an array.
3946 * In this case raid_disks will be 0, and the major_version field is
3947 * use to determine which style super-blocks are to be found on the devices.
3948 * The minor and patch _version numbers are also kept incase the
3949 * super_block handler wishes to interpret them.
3950 */
3951static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
3952{
3953
3954 if (info->raid_disks == 0) {
3955 /* just setting version number for superblock loading */
3956 if (info->major_version < 0 ||
3957 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
3958 super_types[info->major_version].name == NULL) {
3959 /* maybe try to auto-load a module? */
3960 printk(KERN_INFO
3961 "md: superblock version %d not known\n",
3962 info->major_version);
3963 return -EINVAL;
3964 }
3965 mddev->major_version = info->major_version;
3966 mddev->minor_version = info->minor_version;
3967 mddev->patch_version = info->patch_version;
3968 return 0;
3969 }
3970 mddev->major_version = MD_MAJOR_VERSION;
3971 mddev->minor_version = MD_MINOR_VERSION;
3972 mddev->patch_version = MD_PATCHLEVEL_VERSION;
3973 mddev->ctime = get_seconds();
3974
3975 mddev->level = info->level;
17115e03 3976 mddev->clevel[0] = 0;
1da177e4
LT		 3977 mddev->size = info->size;
3978 mddev->raid_disks = info->raid_disks;
3979 /* don't set md_minor, it is determined by which /dev/md* was
3980 * openned
3981 */
3982 if (info->state & (1<<MD_SB_CLEAN))
3983 mddev->recovery_cp = MaxSector;
3984 else
3985 mddev->recovery_cp = 0;
3986 mddev->persistent = ! info->not_persistent;
3987
3988 mddev->layout = info->layout;
3989 mddev->chunk_size = info->chunk_size;
3990
3991 mddev->max_disks = MD_SB_DISKS;
3992
850b2b42
N		 3993 mddev->flags = 0;
3994 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 3995
b2a2703c
N		 3996 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
3997 mddev->bitmap_offset = 0;
3998
f6705578
N		 3999 mddev->reshape_position = MaxSector;
4000
1da177e4
LT		 4001 /*
4002 * Generate a 128 bit UUID
4003 */
4004 get_random_bytes(mddev->uuid, 16);
4005
f6705578
N		 4006 mddev->new_level = mddev->level;
4007 mddev->new_chunk = mddev->chunk_size;
4008 mddev->new_layout = mddev->layout;
4009 mddev->delta_disks = 0;
4010
1da177e4
LT		 4011 return 0;
4012}
4013
a35b0d69
N		 4014static int update_size(mddev_t *mddev, unsigned long size)
4015{
4016 mdk_rdev_t * rdev;
4017 int rv;
4018 struct list_head *tmp;
8ddeeae5 4019 int fit = (size == 0);
a35b0d69
N		 4020
4021 if (mddev->pers->resize == NULL)
4022 return -EINVAL;
4023 /* The "size" is the amount of each device that is used.
4024 * This can only make sense for arrays with redundancy.
4025 * linear and raid0 always use whatever space is available
4026 * We can only consider changing the size if no resync
4027 * or reconstruction is happening, and if the new size
4028 * is acceptable. It must fit before the sb_offset or,
4029 * if that is <data_offset, it must fit before the
4030 * size of each device.
4031 * If size is zero, we find the largest size that fits.
4032 */
4033 if (mddev->sync_thread)
4034 return -EBUSY;
4035 ITERATE_RDEV(mddev,rdev,tmp) {
4036 sector_t avail;
a35b0d69
N		 4037 if (rdev->sb_offset > rdev->data_offset)
4038 avail = (rdev->sb_offset*2) - rdev->data_offset;
4039 else
4040 avail = get_capacity(rdev->bdev->bd_disk)
4041 - rdev->data_offset;
4042 if (fit && (size == 0 || size > avail/2))
4043 size = avail/2;
4044 if (avail < ((sector_t)size << 1))
4045 return -ENOSPC;
4046 }
4047 rv = mddev->pers->resize(mddev, (sector_t)size *2);
4048 if (!rv) {
4049 struct block_device *bdev;
4050
4051 bdev = bdget_disk(mddev->gendisk, 0);
4052 if (bdev) {
1b1dcc1b 4053 mutex_lock(&bdev->bd_inode->i_mutex);
6d89332b 4054 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
1b1dcc1b 4055 mutex_unlock(&bdev->bd_inode->i_mutex);
a35b0d69
N		 4056 bdput(bdev);
4057 }
4058 }
4059 return rv;
4060}
4061
da943b99
N		 4062static int update_raid_disks(mddev_t *mddev, int raid_disks)
4063{
4064 int rv;
4065 /* change the number of raid disks */
63c70c4f 4066 if (mddev->pers->check_reshape == NULL)
da943b99
N		 4067 return -EINVAL;
4068 if (raid_disks <= 0 ||
4069 raid_disks >= mddev->max_disks)
4070 return -EINVAL;
63c70c4f 4071 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
da943b99 4072 return -EBUSY;
63c70c4f
N		 4073 mddev->delta_disks = raid_disks - mddev->raid_disks;
4074
4075 rv = mddev->pers->check_reshape(mddev);
da943b99
N		 4076 return rv;
4077}
4078
4079
1da177e4
LT		 4080/*
4081 * update_array_info is used to change the configuration of an
4082 * on-line array.
4083 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4084 * fields in the info are checked against the array.
4085 * Any differences that cannot be handled will cause an error.
4086 * Normally, only one change can be managed at a time.
4087 */
4088static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4089{
4090 int rv = 0;
4091 int cnt = 0;
36fa3063
N		 4092 int state = 0;
4093
4094 /* calculate expected state,ignoring low bits */
4095 if (mddev->bitmap && mddev->bitmap_offset)
4096 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 4097
4098 if (mddev->major_version != info->major_version ||
4099 mddev->minor_version != info->minor_version ||
4100/* mddev->patch_version != info->patch_version || */
4101 mddev->ctime != info->ctime ||
4102 mddev->level != info->level ||
4103/* mddev->layout != info->layout || */
4104 !mddev->persistent != info->not_persistent||
36fa3063
N		 4105 mddev->chunk_size != info->chunk_size ||
4106 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4107 ((state^info->state) & 0xfffffe00)
4108 )
1da177e4
LT		 4109 return -EINVAL;
4110 /* Check there is only one change */
284ae7ca 4111 if (info->size >= 0 && mddev->size != info->size) cnt++;
1da177e4
LT		 4112 if (mddev->raid_disks != info->raid_disks) cnt++;
4113 if (mddev->layout != info->layout) cnt++;
36fa3063 4114 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 4115 if (cnt == 0) return 0;
4116 if (cnt > 1) return -EINVAL;
4117
4118 if (mddev->layout != info->layout) {
4119 /* Change layout
4120 * we don't need to do anything at the md level, the
4121 * personality will take care of it all.
4122 */
4123 if (mddev->pers->reconfig == NULL)
4124 return -EINVAL;
4125 else
4126 return mddev->pers->reconfig(mddev, info->layout, -1);
4127 }
284ae7ca 4128 if (info->size >= 0 && mddev->size != info->size)
a35b0d69
N		 4129 rv = update_size(mddev, info->size);
4130
da943b99
N		 4131 if (mddev->raid_disks != info->raid_disks)
4132 rv = update_raid_disks(mddev, info->raid_disks);
4133
36fa3063
N		 4134 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4135 if (mddev->pers->quiesce == NULL)
4136 return -EINVAL;
4137 if (mddev->recovery || mddev->sync_thread)
4138 return -EBUSY;
4139 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4140 /* add the bitmap */
4141 if (mddev->bitmap)
4142 return -EEXIST;
4143 if (mddev->default_bitmap_offset == 0)
4144 return -EINVAL;
4145 mddev->bitmap_offset = mddev->default_bitmap_offset;
4146 mddev->pers->quiesce(mddev, 1);
4147 rv = bitmap_create(mddev);
4148 if (rv)
4149 bitmap_destroy(mddev);
4150 mddev->pers->quiesce(mddev, 0);
4151 } else {
4152 /* remove the bitmap */
4153 if (!mddev->bitmap)
4154 return -ENOENT;
4155 if (mddev->bitmap->file)
4156 return -EINVAL;
4157 mddev->pers->quiesce(mddev, 1);
4158 bitmap_destroy(mddev);
4159 mddev->pers->quiesce(mddev, 0);
4160 mddev->bitmap_offset = 0;
4161 }
4162 }
850b2b42 4163 md_update_sb(mddev, 1);
1da177e4
LT		 4164 return rv;
4165}
4166
4167static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4168{
4169 mdk_rdev_t *rdev;
4170
4171 if (mddev->pers == NULL)
4172 return -ENODEV;
4173
4174 rdev = find_rdev(mddev, dev);
4175 if (!rdev)
4176 return -ENODEV;
4177
4178 md_error(mddev, rdev);
4179 return 0;
4180}
4181
a885c8c4
CH		 4182static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4183{
4184 mddev_t *mddev = bdev->bd_disk->private_data;
4185
4186 geo->heads = 2;
4187 geo->sectors = 4;
4188 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4189 return 0;
4190}
4191
1da177e4
LT		 4192static int md_ioctl(struct inode *inode, struct file *file,
4193 unsigned int cmd, unsigned long arg)
4194{
4195 int err = 0;
4196 void __user *argp = (void __user *)arg;
1da177e4
LT		 4197 mddev_t *mddev = NULL;
4198
4199 if (!capable(CAP_SYS_ADMIN))
4200 return -EACCES;
4201
4202 /*
4203 * Commands dealing with the RAID driver but not any
4204 * particular array:
4205 */
4206 switch (cmd)
4207 {
4208 case RAID_VERSION:
4209 err = get_version(argp);
4210 goto done;
4211
4212 case PRINT_RAID_DEBUG:
4213 err = 0;
4214 md_print_devices();
4215 goto done;
4216
4217#ifndef MODULE
4218 case RAID_AUTORUN:
4219 err = 0;
4220 autostart_arrays(arg);
4221 goto done;
4222#endif
4223 default:;
4224 }
4225
4226 /*
4227 * Commands creating/starting a new array:
4228 */
4229
4230 mddev = inode->i_bdev->bd_disk->private_data;
4231
4232 if (!mddev) {
4233 BUG();
4234 goto abort;
4235 }
4236
1da177e4
LT		 4237 err = mddev_lock(mddev);
4238 if (err) {
4239 printk(KERN_INFO
4240 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4241 err, cmd);
4242 goto abort;
4243 }
4244
4245 switch (cmd)
4246 {
4247 case SET_ARRAY_INFO:
4248 {
4249 mdu_array_info_t info;
4250 if (!arg)
4251 memset(&info, 0, sizeof(info));
4252 else if (copy_from_user(&info, argp, sizeof(info))) {
4253 err = -EFAULT;
4254 goto abort_unlock;
4255 }
4256 if (mddev->pers) {
4257 err = update_array_info(mddev, &info);
4258 if (err) {
4259 printk(KERN_WARNING "md: couldn't update"
4260 " array info. %d\n", err);
4261 goto abort_unlock;
4262 }
4263 goto done_unlock;
4264 }
4265 if (!list_empty(&mddev->disks)) {
4266 printk(KERN_WARNING
4267 "md: array %s already has disks!\n",
4268 mdname(mddev));
4269 err = -EBUSY;
4270 goto abort_unlock;
4271 }
4272 if (mddev->raid_disks) {
4273 printk(KERN_WARNING
4274 "md: array %s already initialised!\n",
4275 mdname(mddev));
4276 err = -EBUSY;
4277 goto abort_unlock;
4278 }
4279 err = set_array_info(mddev, &info);
4280 if (err) {
4281 printk(KERN_WARNING "md: couldn't set"
4282 " array info. %d\n", err);
4283 goto abort_unlock;
4284 }
4285 }
4286 goto done_unlock;
4287
4288 default:;
4289 }
4290
4291 /*
4292 * Commands querying/configuring an existing array:
4293 */
32a7627c
N		 4294 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4295 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
4296 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4297 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
1da177e4
LT		 4298 err = -ENODEV;
4299 goto abort_unlock;
4300 }
4301
4302 /*
4303 * Commands even a read-only array can execute:
4304 */
4305 switch (cmd)
4306 {
4307 case GET_ARRAY_INFO:
4308 err = get_array_info(mddev, argp);
4309 goto done_unlock;
4310
32a7627c 4311 case GET_BITMAP_FILE:
87162a28 4312 err = get_bitmap_file(mddev, argp);
32a7627c
N		 4313 goto done_unlock;
4314
1da177e4
LT		 4315 case GET_DISK_INFO:
4316 err = get_disk_info(mddev, argp);
4317 goto done_unlock;
4318
4319 case RESTART_ARRAY_RW:
4320 err = restart_array(mddev);
4321 goto done_unlock;
4322
4323 case STOP_ARRAY:
4324 err = do_md_stop (mddev, 0);
4325 goto done_unlock;
4326
4327 case STOP_ARRAY_RO:
4328 err = do_md_stop (mddev, 1);
4329 goto done_unlock;
4330
4331 /*
4332 * We have a problem here : there is no easy way to give a CHS
4333 * virtual geometry. We currently pretend that we have a 2 heads
4334 * 4 sectors (with a BIG number of cylinders...). This drives
4335 * dosfs just mad... ;-)
4336 */
1da177e4
LT		 4337 }
4338
4339 /*
4340 * The remaining ioctls are changing the state of the
f91de92e
N		 4341 * superblock, so we do not allow them on read-only arrays.
4342 * However non-MD ioctls (e.g. get-size) will still come through
4343 * here and hit the 'default' below, so only disallow
4344 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 4345 */
f91de92e
N		 4346 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4347 mddev->ro && mddev->pers) {
4348 if (mddev->ro == 2) {
4349 mddev->ro = 0;
4350 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4351 md_wakeup_thread(mddev->thread);
4352
4353 } else {
4354 err = -EROFS;
4355 goto abort_unlock;
4356 }
1da177e4
LT		 4357 }
4358
4359 switch (cmd)
4360 {
4361 case ADD_NEW_DISK:
4362 {
4363 mdu_disk_info_t info;
4364 if (copy_from_user(&info, argp, sizeof(info)))
4365 err = -EFAULT;
4366 else
4367 err = add_new_disk(mddev, &info);
4368 goto done_unlock;
4369 }
4370
4371 case HOT_REMOVE_DISK:
4372 err = hot_remove_disk(mddev, new_decode_dev(arg));
4373 goto done_unlock;
4374
4375 case HOT_ADD_DISK:
4376 err = hot_add_disk(mddev, new_decode_dev(arg));
4377 goto done_unlock;
4378
4379 case SET_DISK_FAULTY:
4380 err = set_disk_faulty(mddev, new_decode_dev(arg));
4381 goto done_unlock;
4382
4383 case RUN_ARRAY:
4384 err = do_md_run (mddev);
4385 goto done_unlock;
4386
32a7627c
N		 4387 case SET_BITMAP_FILE:
4388 err = set_bitmap_file(mddev, (int)arg);
4389 goto done_unlock;
4390
1da177e4 4391 default:
1da177e4
LT		 4392 err = -EINVAL;
4393 goto abort_unlock;
4394 }
4395
4396done_unlock:
4397abort_unlock:
4398 mddev_unlock(mddev);
4399
4400 return err;
4401done:
4402 if (err)
4403 MD_BUG();
4404abort:
4405 return err;
4406}
4407
4408static int md_open(struct inode *inode, struct file *file)
4409{
4410 /*
4411 * Succeed if we can lock the mddev, which confirms that
4412 * it isn't being stopped right now.
4413 */
4414 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4415 int err;
4416
4417 if ((err = mddev_lock(mddev)))
4418 goto out;
4419
4420 err = 0;
4421 mddev_get(mddev);
4422 mddev_unlock(mddev);
4423
4424 check_disk_change(inode->i_bdev);
4425 out:
4426 return err;
4427}
4428
4429static int md_release(struct inode *inode, struct file * file)
4430{
4431 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4432
4433 if (!mddev)
4434 BUG();
4435 mddev_put(mddev);
4436
4437 return 0;
4438}
4439
4440static int md_media_changed(struct gendisk *disk)
4441{
4442 mddev_t *mddev = disk->private_data;
4443
4444 return mddev->changed;
4445}
4446
4447static int md_revalidate(struct gendisk *disk)
4448{
4449 mddev_t *mddev = disk->private_data;
4450
4451 mddev->changed = 0;
4452 return 0;
4453}
4454static struct block_device_operations md_fops =
4455{
4456 .owner = THIS_MODULE,
4457 .open = md_open,
4458 .release = md_release,
4459 .ioctl = md_ioctl,
a885c8c4 4460 .getgeo = md_getgeo,
1da177e4
LT		 4461 .media_changed = md_media_changed,
4462 .revalidate_disk= md_revalidate,
4463};
4464
75c96f85 4465static int md_thread(void * arg)
1da177e4
LT		 4466{
4467 mdk_thread_t *thread = arg;
4468
1da177e4
LT		 4469 /*
4470 * md_thread is a 'system-thread', it's priority should be very
4471 * high. We avoid resource deadlocks individually in each
4472 * raid personality. (RAID5 does preallocation) We also use RR and
4473 * the very same RT priority as kswapd, thus we will never get
4474 * into a priority inversion deadlock.
4475 *
4476 * we definitely have to have equal or higher priority than
4477 * bdflush, otherwise bdflush will deadlock if there are too
4478 * many dirty RAID5 blocks.
4479 */
1da177e4 4480
6985c43f 4481 allow_signal(SIGKILL);
a6fb0934 4482 while (!kthread_should_stop()) {
1da177e4 4483
93588e22
N		 4484 /* We need to wait INTERRUPTIBLE so that
4485 * we don't add to the load-average.
4486 * That means we need to be sure no signals are
4487 * pending
4488 */
4489 if (signal_pending(current))
4490 flush_signals(current);
4491
4492 wait_event_interruptible_timeout
4493 (thread->wqueue,
4494 test_bit(THREAD_WAKEUP, &thread->flags)
4495 || kthread_should_stop(),
4496 thread->timeout);
3e1d1d28 4497 try_to_freeze();
1da177e4
LT		 4498
4499 clear_bit(THREAD_WAKEUP, &thread->flags);
4500
787453c2 4501 thread->run(thread->mddev);
1da177e4 4502 }
a6fb0934 4503
1da177e4
LT		 4504 return 0;
4505}
4506
4507void md_wakeup_thread(mdk_thread_t *thread)
4508{
4509 if (thread) {
4510 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4511 set_bit(THREAD_WAKEUP, &thread->flags);
4512 wake_up(&thread->wqueue);
4513 }
4514}
4515
4516mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4517 const char *name)
4518{
4519 mdk_thread_t *thread;
1da177e4 4520
9ffae0cf 4521 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 4522 if (!thread)
4523 return NULL;
4524
1da177e4
LT		 4525 init_waitqueue_head(&thread->wqueue);
4526
1da177e4
LT		 4527 thread->run = run;
4528 thread->mddev = mddev;
32a7627c 4529 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 4530 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 4531 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 4532 kfree(thread);
4533 return NULL;
4534 }
1da177e4
LT		 4535 return thread;
4536}
4537
1da177e4
LT		 4538void md_unregister_thread(mdk_thread_t *thread)
4539{
d28446fe 4540 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
a6fb0934
N		 4541
4542 kthread_stop(thread->tsk);
1da177e4
LT		 4543 kfree(thread);
4544}
4545
4546void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4547{
4548 if (!mddev) {
4549 MD_BUG();
4550 return;
4551 }
4552
b2d444d7 4553 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 4554 return;
32a7627c 4555/*
1da177e4
LT		 4556 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4557 mdname(mddev),
4558 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4559 __builtin_return_address(0),__builtin_return_address(1),
4560 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 4561*/
d0a0a5ee
AM		 4562 if (!mddev->pers)
4563 return;
1da177e4
LT		 4564 if (!mddev->pers->error_handler)
4565 return;
4566 mddev->pers->error_handler(mddev,rdev);
4567 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4568 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4569 md_wakeup_thread(mddev->thread);
c331eb04 4570 md_new_event_inintr(mddev);
1da177e4
LT		 4571}
4572
4573/* seq_file implementation /proc/mdstat */
4574
4575static void status_unused(struct seq_file *seq)
4576{
4577 int i = 0;
4578 mdk_rdev_t *rdev;
4579 struct list_head *tmp;
4580
4581 seq_printf(seq, "unused devices: ");
4582
4583 ITERATE_RDEV_PENDING(rdev,tmp) {
4584 char b[BDEVNAME_SIZE];
4585 i++;
4586 seq_printf(seq, "%s ",
4587 bdevname(rdev->bdev,b));
4588 }
4589 if (!i)
4590 seq_printf(seq, "<none>");
4591
4592 seq_printf(seq, "\n");
4593}
4594
4595
4596static void status_resync(struct seq_file *seq, mddev_t * mddev)
4597{
4588b42e
N		 4598 sector_t max_blocks, resync, res;
4599 unsigned long dt, db, rt;
4600 int scale;
4601 unsigned int per_milli;
1da177e4
LT		 4602
4603 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4604
4605 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4606 max_blocks = mddev->resync_max_sectors >> 1;
4607 else
4608 max_blocks = mddev->size;
4609
4610 /*
4611 * Should not happen.
4612 */
4613 if (!max_blocks) {
4614 MD_BUG();
4615 return;
4616 }
4588b42e
N		 4617 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4618 * in a sector_t, and (max_blocks>>scale) will fit in a
4619 * u32, as those are the requirements for sector_div.
4620 * Thus 'scale' must be at least 10
4621 */
4622 scale = 10;
4623 if (sizeof(sector_t) > sizeof(unsigned long)) {
4624 while ( max_blocks/2 > (1ULL<<(scale+32)))
4625 scale++;
4626 }
4627 res = (resync>>scale)*1000;
4628 sector_div(res, (u32)((max_blocks>>scale)+1));
4629
4630 per_milli = res;
1da177e4 4631 {
4588b42e 4632 int i, x = per_milli/50, y = 20-x;
1da177e4
LT		 4633 seq_printf(seq, "[");
4634 for (i = 0; i < x; i++)
4635 seq_printf(seq, "=");
4636 seq_printf(seq, ">");
4637 for (i = 0; i < y; i++)
4638 seq_printf(seq, ".");
4639 seq_printf(seq, "] ");
4640 }
4588b42e 4641 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
ccfcc3c1
N		 4642 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
4643 "reshape" :
61df9d91
N		 4644 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
4645 "check" :
4646 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4647 "resync" : "recovery"))),
4648 per_milli/10, per_milli % 10,
4588b42e
N		 4649 (unsigned long long) resync,
4650 (unsigned long long) max_blocks);
1da177e4
LT		 4651
4652 /*
4653 * We do not want to overflow, so the order of operands and
4654 * the * 100 / 100 trick are important. We do a +1 to be
4655 * safe against division by zero. We only estimate anyway.
4656 *
4657 * dt: time from mark until now
4658 * db: blocks written from mark until now
4659 * rt: remaining time
4660 */
4661 dt = ((jiffies - mddev->resync_mark) / HZ);
4662 if (!dt) dt++;
ff4e8d9a
N		 4663 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
4664 - mddev->resync_mark_cnt;
4665 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
1da177e4
LT		 4666
4667 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4668
ff4e8d9a 4669 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
1da177e4
LT		 4670}
4671
4672static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4673{
4674 struct list_head *tmp;
4675 loff_t l = *pos;
4676 mddev_t *mddev;
4677
4678 if (l >= 0x10000)
4679 return NULL;
4680 if (!l--)
4681 /* header */
4682 return (void*)1;
4683
4684 spin_lock(&all_mddevs_lock);
4685 list_for_each(tmp,&all_mddevs)
4686 if (!l--) {
4687 mddev = list_entry(tmp, mddev_t, all_mddevs);
4688 mddev_get(mddev);
4689 spin_unlock(&all_mddevs_lock);
4690 return mddev;
4691 }
4692 spin_unlock(&all_mddevs_lock);
4693 if (!l--)
4694 return (void*)2;/* tail */
4695 return NULL;
4696}
4697
4698static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4699{
4700 struct list_head *tmp;
4701 mddev_t *next_mddev, *mddev = v;
4702
4703 ++*pos;
4704 if (v == (void*)2)
4705 return NULL;
4706
4707 spin_lock(&all_mddevs_lock);
4708 if (v == (void*)1)
4709 tmp = all_mddevs.next;
4710 else
4711 tmp = mddev->all_mddevs.next;
4712 if (tmp != &all_mddevs)
4713 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4714 else {
4715 next_mddev = (void*)2;
4716 *pos = 0x10000;
4717 }
4718 spin_unlock(&all_mddevs_lock);
4719
4720 if (v != (void*)1)
4721 mddev_put(mddev);
4722 return next_mddev;
4723
4724}
4725
4726static void md_seq_stop(struct seq_file *seq, void *v)
4727{
4728 mddev_t *mddev = v;
4729
4730 if (mddev && v != (void*)1 && v != (void*)2)
4731 mddev_put(mddev);
4732}
4733
d7603b7e
N		 4734struct mdstat_info {
4735 int event;
4736};
4737
1da177e4
LT		 4738static int md_seq_show(struct seq_file *seq, void *v)
4739{
4740 mddev_t *mddev = v;
4741 sector_t size;
4742 struct list_head *tmp2;
4743 mdk_rdev_t *rdev;
d7603b7e 4744 struct mdstat_info *mi = seq->private;
32a7627c 4745 struct bitmap *bitmap;
1da177e4
LT		 4746
4747 if (v == (void*)1) {
2604b703 4748 struct mdk_personality *pers;
1da177e4
LT		 4749 seq_printf(seq, "Personalities : ");
4750 spin_lock(&pers_lock);
2604b703
N		 4751 list_for_each_entry(pers, &pers_list, list)
4752 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT		 4753
4754 spin_unlock(&pers_lock);
4755 seq_printf(seq, "\n");
d7603b7e 4756 mi->event = atomic_read(&md_event_count);
1da177e4
LT		 4757 return 0;
4758 }
4759 if (v == (void*)2) {
4760 status_unused(seq);
4761 return 0;
4762 }
4763
5dc5cf7d 4764 if (mddev_lock(mddev) < 0)
1da177e4 4765 return -EINTR;
5dc5cf7d 4766
1da177e4
LT		 4767 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4768 seq_printf(seq, "%s : %sactive", mdname(mddev),
4769 mddev->pers ? "" : "in");
4770 if (mddev->pers) {
f91de92e 4771 if (mddev->ro==1)
1da177e4 4772 seq_printf(seq, " (read-only)");
f91de92e
N		 4773 if (mddev->ro==2)
4774 seq_printf(seq, "(auto-read-only)");
1da177e4
LT		 4775 seq_printf(seq, " %s", mddev->pers->name);
4776 }
4777
4778 size = 0;
4779 ITERATE_RDEV(mddev,rdev,tmp2) {
4780 char b[BDEVNAME_SIZE];
4781 seq_printf(seq, " %s[%d]",
4782 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 4783 if (test_bit(WriteMostly, &rdev->flags))
4784 seq_printf(seq, "(W)");
b2d444d7 4785 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4786 seq_printf(seq, "(F)");
4787 continue;
b325a32e
N		 4788 } else if (rdev->raid_disk < 0)
4789 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 4790 size += rdev->size;
4791 }
4792
4793 if (!list_empty(&mddev->disks)) {
4794 if (mddev->pers)
4795 seq_printf(seq, "\n %llu blocks",
4796 (unsigned long long)mddev->array_size);
4797 else
4798 seq_printf(seq, "\n %llu blocks",
4799 (unsigned long long)size);
4800 }
1cd6bf19
N		 4801 if (mddev->persistent) {
4802 if (mddev->major_version != 0 ||
4803 mddev->minor_version != 90) {
4804 seq_printf(seq," super %d.%d",
4805 mddev->major_version,
4806 mddev->minor_version);
4807 }
4808 } else
4809 seq_printf(seq, " super non-persistent");
1da177e4
LT		 4810
4811 if (mddev->pers) {
4812 mddev->pers->status (seq, mddev);
4813 seq_printf(seq, "\n ");
8e1b39d6
N		 4814 if (mddev->pers->sync_request) {
4815 if (mddev->curr_resync > 2) {
4816 status_resync (seq, mddev);
4817 seq_printf(seq, "\n ");
4818 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4819 seq_printf(seq, "\tresync=DELAYED\n ");
4820 else if (mddev->recovery_cp < MaxSector)
4821 seq_printf(seq, "\tresync=PENDING\n ");
4822 }
32a7627c
N		 4823 } else
4824 seq_printf(seq, "\n ");
4825
4826 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 4827 unsigned long chunk_kb;
4828 unsigned long flags;
32a7627c
N		 4829 spin_lock_irqsave(&bitmap->lock, flags);
4830 chunk_kb = bitmap->chunksize >> 10;
4831 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
4832 "%lu%s chunk",
4833 bitmap->pages - bitmap->missing_pages,
4834 bitmap->pages,
4835 (bitmap->pages - bitmap->missing_pages)
4836 << (PAGE_SHIFT - 10),
4837 chunk_kb ? chunk_kb : bitmap->chunksize,
4838 chunk_kb ? "KB" : "B");
78d742d8
N		 4839 if (bitmap->file) {
4840 seq_printf(seq, ", file: ");
4841 seq_path(seq, bitmap->file->f_vfsmnt,
4842 bitmap->file->f_dentry," \t\n");
32a7627c 4843 }
78d742d8 4844
32a7627c
N		 4845 seq_printf(seq, "\n");
4846 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 4847 }
4848
4849 seq_printf(seq, "\n");
4850 }
4851 mddev_unlock(mddev);
4852
4853 return 0;
4854}
4855
4856static struct seq_operations md_seq_ops = {
4857 .start = md_seq_start,
4858 .next = md_seq_next,
4859 .stop = md_seq_stop,
4860 .show = md_seq_show,
4861};
4862
4863static int md_seq_open(struct inode *inode, struct file *file)
4864{
4865 int error;
d7603b7e
N		 4866 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
4867 if (mi == NULL)
4868 return -ENOMEM;
1da177e4
LT		 4869
4870 error = seq_open(file, &md_seq_ops);
d7603b7e
N		 4871 if (error)
4872 kfree(mi);
4873 else {
4874 struct seq_file *p = file->private_data;
4875 p->private = mi;
4876 mi->event = atomic_read(&md_event_count);
4877 }
1da177e4
LT		 4878 return error;
4879}
4880
d7603b7e
N		 4881static int md_seq_release(struct inode *inode, struct file *file)
4882{
4883 struct seq_file *m = file->private_data;
4884 struct mdstat_info *mi = m->private;
4885 m->private = NULL;
4886 kfree(mi);
4887 return seq_release(inode, file);
4888}
4889
4890static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
4891{
4892 struct seq_file *m = filp->private_data;
4893 struct mdstat_info *mi = m->private;
4894 int mask;
4895
4896 poll_wait(filp, &md_event_waiters, wait);
4897
4898 /* always allow read */
4899 mask = POLLIN | POLLRDNORM;
4900
4901 if (mi->event != atomic_read(&md_event_count))
4902 mask |= POLLERR | POLLPRI;
4903 return mask;
4904}
4905
1da177e4
LT		 4906static struct file_operations md_seq_fops = {
4907 .open = md_seq_open,
4908 .read = seq_read,
4909 .llseek = seq_lseek,
d7603b7e
N		 4910 .release = md_seq_release,
4911 .poll = mdstat_poll,
1da177e4
LT		 4912};
4913
2604b703 4914int register_md_personality(struct mdk_personality *p)
1da177e4 4915{
1da177e4 4916 spin_lock(&pers_lock);
2604b703
N		 4917 list_add_tail(&p->list, &pers_list);
4918 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
1da177e4
LT		 4919 spin_unlock(&pers_lock);
4920 return 0;
4921}
4922
2604b703 4923int unregister_md_personality(struct mdk_personality *p)
1da177e4 4924{
2604b703 4925 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 4926 spin_lock(&pers_lock);
2604b703 4927 list_del_init(&p->list);
1da177e4
LT		 4928 spin_unlock(&pers_lock);
4929 return 0;
4930}
4931
4932static int is_mddev_idle(mddev_t *mddev)
4933{
4934 mdk_rdev_t * rdev;
4935 struct list_head *tmp;
4936 int idle;
4937 unsigned long curr_events;
4938
4939 idle = 1;
4940 ITERATE_RDEV(mddev,rdev,tmp) {
4941 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 4942 curr_events = disk_stat_read(disk, sectors[0]) +
4943 disk_stat_read(disk, sectors[1]) -
1da177e4 4944 atomic_read(&disk->sync_io);
c0e48521
N		 4945 /* The difference between curr_events and last_events
4946 * will be affected by any new non-sync IO (making
4947 * curr_events bigger) and any difference in the amount of
4948 * in-flight syncio (making current_events bigger or smaller)
4949 * The amount in-flight is currently limited to
4950 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4951 * which is at most 4096 sectors.
4952 * These numbers are fairly fragile and should be made
4953 * more robust, probably by enforcing the
4954 * 'window size' that md_do_sync sort-of uses.
4955 *
1da177e4
LT		 4956 * Note: the following is an unsigned comparison.
4957 */
c0e48521 4958 if ((curr_events - rdev->last_events + 4096) > 8192) {
1da177e4
LT		 4959 rdev->last_events = curr_events;
4960 idle = 0;
4961 }
4962 }
4963 return idle;
4964}
4965
4966void md_done_sync(mddev_t *mddev, int blocks, int ok)
4967{
4968 /* another "blocks" (512byte) blocks have been synced */
4969 atomic_sub(blocks, &mddev->recovery_active);
4970 wake_up(&mddev->recovery_wait);
4971 if (!ok) {
4972 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4973 md_wakeup_thread(mddev->thread);
4974 // stop recovery, signal do_sync ....
4975 }
4976}
4977
4978
06d91a5f
N		 4979/* md_write_start(mddev, bi)
4980 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 4981 * in superblock) before writing, schedule a superblock update
4982 * and wait for it to complete.
06d91a5f 4983 */
3d310eb7 4984void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 4985{
06d91a5f 4986 if (bio_data_dir(bi) != WRITE)
3d310eb7 4987 return;
06d91a5f 4988
f91de92e
N		 4989 BUG_ON(mddev->ro == 1);
4990 if (mddev->ro == 2) {
4991 /* need to switch to read/write */
4992 mddev->ro = 0;
4993 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4994 md_wakeup_thread(mddev->thread);
4995 }
06d91a5f 4996 atomic_inc(&mddev->writes_pending);
06d91a5f 4997 if (mddev->in_sync) {
a9701a30 4998 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 4999 if (mddev->in_sync) {
5000 mddev->in_sync = 0;
850b2b42 5001 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3d310eb7
N		 5002 md_wakeup_thread(mddev->thread);
5003 }
a9701a30 5004 spin_unlock_irq(&mddev->write_lock);
06d91a5f 5005 }
850b2b42 5006 wait_event(mddev->sb_wait, mddev->flags==0);
1da177e4
LT		 5007}
5008
5009void md_write_end(mddev_t *mddev)
5010{
5011 if (atomic_dec_and_test(&mddev->writes_pending)) {
5012 if (mddev->safemode == 2)
5013 md_wakeup_thread(mddev->thread);
16f17b39 5014 else if (mddev->safemode_delay)
1da177e4
LT		 5015 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5016 }
5017}
5018
75c96f85 5019static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
1da177e4
LT		 5020
5021#define SYNC_MARKS 10
5022#define SYNC_MARK_STEP (3*HZ)
29269553 5023void md_do_sync(mddev_t *mddev)
1da177e4
LT		 5024{
5025 mddev_t *mddev2;
5026 unsigned int currspeed = 0,
5027 window;
57afd89f 5028 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 5029 unsigned long mark[SYNC_MARKS];
5030 sector_t mark_cnt[SYNC_MARKS];
5031 int last_mark,m;
5032 struct list_head *tmp;
5033 sector_t last_check;
57afd89f 5034 int skipped = 0;
5fd6c1dc
N		 5035 struct list_head *rtmp;
5036 mdk_rdev_t *rdev;
61df9d91 5037 char *desc;
1da177e4
LT		 5038
5039 /* just incase thread restarts... */
5040 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5041 return;
5fd6c1dc
N		 5042 if (mddev->ro) /* never try to sync a read-only array */
5043 return;
1da177e4 5044
61df9d91
N		 5045 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5046 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5047 desc = "data-check";
5048 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5049 desc = "requested-resync";
5050 else
5051 desc = "resync";
5052 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5053 desc = "reshape";
5054 else
5055 desc = "recovery";
5056
1da177e4
LT		 5057 /* we overload curr_resync somewhat here.
5058 * 0 == not engaged in resync at all
5059 * 2 == checking that there is no conflict with another sync
5060 * 1 == like 2, but have yielded to allow conflicting resync to
5061 * commense
5062 * other == active in resync - this many blocks
5063 *
5064 * Before starting a resync we must have set curr_resync to
5065 * 2, and then checked that every "conflicting" array has curr_resync
5066 * less than ours. When we find one that is the same or higher
5067 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5068 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5069 * This will mean we have to start checking from the beginning again.
5070 *
5071 */
5072
5073 do {
5074 mddev->curr_resync = 2;
5075
5076 try_again:
787453c2 5077 if (kthread_should_stop()) {
6985c43f 5078 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 5079 goto skip;
5080 }
5081 ITERATE_MDDEV(mddev2,tmp) {
1da177e4
LT		 5082 if (mddev2 == mddev)
5083 continue;
5084 if (mddev2->curr_resync &&
5085 match_mddev_units(mddev,mddev2)) {
5086 DEFINE_WAIT(wq);
5087 if (mddev < mddev2 && mddev->curr_resync == 2) {
5088 /* arbitrarily yield */
5089 mddev->curr_resync = 1;
5090 wake_up(&resync_wait);
5091 }
5092 if (mddev > mddev2 && mddev->curr_resync == 1)
5093 /* no need to wait here, we can wait the next
5094 * time 'round when curr_resync == 2
5095 */
5096 continue;
787453c2
N		 5097 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5098 if (!kthread_should_stop() &&
8712e553 5099 mddev2->curr_resync >= mddev->curr_resync) {
61df9d91
N		 5100 printk(KERN_INFO "md: delaying %s of %s"
5101 " until %s has finished (they"
1da177e4 5102 " share one or more physical units)\n",
61df9d91 5103 desc, mdname(mddev), mdname(mddev2));
1da177e4
LT		 5104 mddev_put(mddev2);
5105 schedule();
5106 finish_wait(&resync_wait, &wq);
5107 goto try_again;
5108 }
5109 finish_wait(&resync_wait, &wq);
5110 }
5111 }
5112 } while (mddev->curr_resync < 2);
5113
5fd6c1dc 5114 j = 0;
9d88883e 5115 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 5116 /* resync follows the size requested by the personality,
57afd89f 5117 * which defaults to physical size, but can be virtual size
1da177e4
LT		 5118 */
5119 max_sectors = mddev->resync_max_sectors;
9d88883e 5120 mddev->resync_mismatches = 0;
5fd6c1dc
N		 5121 /* we don't use the checkpoint if there's a bitmap */
5122 if (!mddev->bitmap &&
5123 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5124 j = mddev->recovery_cp;
ccfcc3c1
N		 5125 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5126 max_sectors = mddev->size << 1;
5fd6c1dc 5127 else {
1da177e4
LT		 5128 /* recovery follows the physical size of devices */
5129 max_sectors = mddev->size << 1;
5fd6c1dc
N		 5130 j = MaxSector;
5131 ITERATE_RDEV(mddev,rdev,rtmp)
5132 if (rdev->raid_disk >= 0 &&
5133 !test_bit(Faulty, &rdev->flags) &&
5134 !test_bit(In_sync, &rdev->flags) &&
5135 rdev->recovery_offset < j)
5136 j = rdev->recovery_offset;
5137 }
1da177e4 5138
61df9d91
N		 5139 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5140 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5141 " %d KB/sec/disk.\n", speed_min(mddev));
338cec32 5142 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
61df9d91
N		 5143 "(but not more than %d KB/sec) for %s.\n",
5144 speed_max(mddev), desc);
1da177e4
LT		 5145
5146 is_mddev_idle(mddev); /* this also initializes IO event counters */
5fd6c1dc 5147
57afd89f 5148 io_sectors = 0;
1da177e4
LT		 5149 for (m = 0; m < SYNC_MARKS; m++) {
5150 mark[m] = jiffies;
57afd89f 5151 mark_cnt[m] = io_sectors;
1da177e4
LT		 5152 }
5153 last_mark = 0;
5154 mddev->resync_mark = mark[last_mark];
5155 mddev->resync_mark_cnt = mark_cnt[last_mark];
5156
5157 /*
5158 * Tune reconstruction:
5159 */
5160 window = 32*(PAGE_SIZE/512);
5161 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5162 window/2,(unsigned long long) max_sectors/2);
5163
5164 atomic_set(&mddev->recovery_active, 0);
5165 init_waitqueue_head(&mddev->recovery_wait);
5166 last_check = 0;
5167
5168 if (j>2) {
5169 printk(KERN_INFO
61df9d91
N		 5170 "md: resuming %s of %s from checkpoint.\n",
5171 desc, mdname(mddev));
1da177e4
LT		 5172 mddev->curr_resync = j;
5173 }
5174
5175 while (j < max_sectors) {
57afd89f 5176 sector_t sectors;
1da177e4 5177
57afd89f
N		 5178 skipped = 0;
5179 sectors = mddev->pers->sync_request(mddev, j, &skipped,
88202a0c 5180 currspeed < speed_min(mddev));
57afd89f 5181 if (sectors == 0) {
1da177e4
LT		 5182 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5183 goto out;
5184 }
57afd89f
N		 5185
5186 if (!skipped) { /* actual IO requested */
5187 io_sectors += sectors;
5188 atomic_add(sectors, &mddev->recovery_active);
5189 }
5190
1da177e4
LT		 5191 j += sectors;
5192 if (j>1) mddev->curr_resync = j;
ff4e8d9a 5193 mddev->curr_mark_cnt = io_sectors;
d7603b7e
N		 5194 if (last_check == 0)
5195 /* this is the earliers that rebuilt will be
5196 * visible in /proc/mdstat
5197 */
5198 md_new_event(mddev);
57afd89f
N		 5199
5200 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 5201 continue;
5202
57afd89f 5203 last_check = io_sectors;
1da177e4
LT		 5204
5205 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
5206 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
5207 break;
5208
5209 repeat:
5210 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5211 /* step marks */
5212 int next = (last_mark+1) % SYNC_MARKS;
5213
5214 mddev->resync_mark = mark[next];
5215 mddev->resync_mark_cnt = mark_cnt[next];
5216 mark[next] = jiffies;
57afd89f 5217 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 5218 last_mark = next;
5219 }
5220
5221
787453c2 5222 if (kthread_should_stop()) {
1da177e4
LT		 5223 /*
5224 * got a signal, exit.
5225 */
5226 printk(KERN_INFO
5227 "md: md_do_sync() got signal ... exiting\n");
1da177e4
LT		 5228 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5229 goto out;
5230 }
5231
5232 /*
5233 * this loop exits only if either when we are slower than
5234 * the 'hard' speed limit, or the system was IO-idle for
5235 * a jiffy.
5236 * the system might be non-idle CPU-wise, but we only care
5237 * about not overloading the IO subsystem. (things like an
5238 * e2fsck being done on the RAID array should execute fast)
5239 */
5240 mddev->queue->unplug_fn(mddev->queue);
5241 cond_resched();
5242
57afd89f
N		 5243 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5244 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4 5245
88202a0c
N		 5246 if (currspeed > speed_min(mddev)) {
5247 if ((currspeed > speed_max(mddev)) ||
1da177e4 5248 !is_mddev_idle(mddev)) {
c0e48521 5249 msleep(500);
1da177e4
LT		 5250 goto repeat;
5251 }
5252 }
5253 }
61df9d91 5254 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
1da177e4
LT		 5255 /*
5256 * this also signals 'finished resyncing' to md_stop
5257 */
5258 out:
5259 mddev->queue->unplug_fn(mddev->queue);
5260
5261 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5262
5263 /* tell personality that we are finished */
57afd89f 5264 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 5265
5266 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
ccfcc3c1
N		 5267 test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
5268 !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5fd6c1dc
N		 5269 mddev->curr_resync > 2) {
5270 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5271 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5272 if (mddev->curr_resync >= mddev->recovery_cp) {
5273 printk(KERN_INFO
61df9d91
N		 5274 "md: checkpointing %s of %s.\n",
5275 desc, mdname(mddev));
5fd6c1dc
N		 5276 mddev->recovery_cp = mddev->curr_resync;
5277 }
5278 } else
5279 mddev->recovery_cp = MaxSector;
5280 } else {
5281 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5282 mddev->curr_resync = MaxSector;
5283 ITERATE_RDEV(mddev,rdev,rtmp)
5284 if (rdev->raid_disk >= 0 &&
5285 !test_bit(Faulty, &rdev->flags) &&
5286 !test_bit(In_sync, &rdev->flags) &&
5287 rdev->recovery_offset < mddev->curr_resync)
5288 rdev->recovery_offset = mddev->curr_resync;
5fd6c1dc 5289 }
1da177e4
LT		 5290 }
5291
1da177e4
LT		 5292 skip:
5293 mddev->curr_resync = 0;
5294 wake_up(&resync_wait);
5295 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5296 md_wakeup_thread(mddev->thread);
5297}
29269553 5298EXPORT_SYMBOL_GPL(md_do_sync);
1da177e4
LT		 5299
5300
5301/*
5302 * This routine is regularly called by all per-raid-array threads to
5303 * deal with generic issues like resync and super-block update.
5304 * Raid personalities that don't have a thread (linear/raid0) do not
5305 * need this as they never do any recovery or update the superblock.
5306 *
5307 * It does not do any resync itself, but rather "forks" off other threads
5308 * to do that as needed.
5309 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5310 * "->recovery" and create a thread at ->sync_thread.
5311 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5312 * and wakeups up this thread which will reap the thread and finish up.
5313 * This thread also removes any faulty devices (with nr_pending == 0).
5314 *
5315 * The overall approach is:
5316 * 1/ if the superblock needs updating, update it.
5317 * 2/ If a recovery thread is running, don't do anything else.
5318 * 3/ If recovery has finished, clean up, possibly marking spares active.
5319 * 4/ If there are any faulty devices, remove them.
5320 * 5/ If array is degraded, try to add spares devices
5321 * 6/ If array has spares or is not in-sync, start a resync thread.
5322 */
5323void md_check_recovery(mddev_t *mddev)
5324{
5325 mdk_rdev_t *rdev;
5326 struct list_head *rtmp;
5327
5328
5f40402d
N		 5329 if (mddev->bitmap)
5330 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 5331
5332 if (mddev->ro)
5333 return;
fca4d848
N		 5334
5335 if (signal_pending(current)) {
5336 if (mddev->pers->sync_request) {
5337 printk(KERN_INFO "md: %s in immediate safe mode\n",
5338 mdname(mddev));
5339 mddev->safemode = 2;
5340 }
5341 flush_signals(current);
5342 }
5343
1da177e4 5344 if ( ! (
850b2b42 5345 mddev->flags ||
1da177e4 5346 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848
N		 5347 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
5348 (mddev->safemode == 1) ||
5349 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5350 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 5351 ))
5352 return;
fca4d848 5353
df5b89b3 5354 if (mddev_trylock(mddev)) {
1da177e4 5355 int spares =0;
fca4d848 5356
a9701a30 5357 spin_lock_irq(&mddev->write_lock);
fca4d848
N		 5358 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
5359 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
5360 mddev->in_sync = 1;
850b2b42 5361 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
fca4d848
N		 5362 }
5363 if (mddev->safemode == 1)
5364 mddev->safemode = 0;
a9701a30 5365 spin_unlock_irq(&mddev->write_lock);
fca4d848 5366
850b2b42
N		 5367 if (mddev->flags)
5368 md_update_sb(mddev, 0);
06d91a5f 5369
06d91a5f 5370
1da177e4
LT		 5371 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
5372 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
5373 /* resync/recovery still happening */
5374 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5375 goto unlock;
5376 }
5377 if (mddev->sync_thread) {
5378 /* resync has finished, collect result */
5379 md_unregister_thread(mddev->sync_thread);
5380 mddev->sync_thread = NULL;
5381 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5382 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5383 /* success...*/
5384 /* activate any spares */
5385 mddev->pers->spare_active(mddev);
5386 }
850b2b42 5387 md_update_sb(mddev, 1);
41158c7e
N		 5388
5389 /* if array is no-longer degraded, then any saved_raid_disk
5390 * information must be scrapped
5391 */
5392 if (!mddev->degraded)
5393 ITERATE_RDEV(mddev,rdev,rtmp)
5394 rdev->saved_raid_disk = -1;
5395
1da177e4
LT		 5396 mddev->recovery = 0;
5397 /* flag recovery needed just to double check */
5398 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
d7603b7e 5399 md_new_event(mddev);
1da177e4
LT		 5400 goto unlock;
5401 }
24dd469d
N		 5402 /* Clear some bits that don't mean anything, but
5403 * might be left set
5404 */
5405 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5406 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
5407 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
5408 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4 5409
5fd6c1dc
N		 5410 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5411 goto unlock;
1da177e4
LT		 5412 /* no recovery is running.
5413 * remove any failed drives, then
5414 * add spares if possible.
5415 * Spare are also removed and re-added, to allow
5416 * the personality to fail the re-add.
5417 */
5418 ITERATE_RDEV(mddev,rdev,rtmp)
5419 if (rdev->raid_disk >= 0 &&
b2d444d7 5420 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
1da177e4 5421 atomic_read(&rdev->nr_pending)==0) {
86e6ffdd
N		 5422 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
5423 char nm[20];
5424 sprintf(nm,"rd%d", rdev->raid_disk);
5425 sysfs_remove_link(&mddev->kobj, nm);
1da177e4 5426 rdev->raid_disk = -1;
86e6ffdd 5427 }
1da177e4
LT		 5428 }
5429
5430 if (mddev->degraded) {
5431 ITERATE_RDEV(mddev,rdev,rtmp)
5432 if (rdev->raid_disk < 0
b2d444d7 5433 && !test_bit(Faulty, &rdev->flags)) {
5fd6c1dc 5434 rdev->recovery_offset = 0;
86e6ffdd
N		 5435 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5436 char nm[20];
5437 sprintf(nm, "rd%d", rdev->raid_disk);
5438 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
1da177e4 5439 spares++;
d7603b7e 5440 md_new_event(mddev);
86e6ffdd 5441 } else
1da177e4
LT		 5442 break;
5443 }
5444 }
5445
24dd469d
N		 5446 if (spares) {
5447 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5448 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5449 } else if (mddev->recovery_cp < MaxSector) {
5450 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5451 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5452 /* nothing to be done ... */
1da177e4 5453 goto unlock;
24dd469d 5454
1da177e4
LT		 5455 if (mddev->pers->sync_request) {
5456 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 5457 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
5458 /* We are adding a device or devices to an array
5459 * which has the bitmap stored on all devices.
5460 * So make sure all bitmap pages get written
5461 */
5462 bitmap_write_all(mddev->bitmap);
5463 }
1da177e4
LT		 5464 mddev->sync_thread = md_register_thread(md_do_sync,
5465 mddev,
5466 "%s_resync");
5467 if (!mddev->sync_thread) {
5468 printk(KERN_ERR "%s: could not start resync"
5469 " thread...\n",
5470 mdname(mddev));
5471 /* leave the spares where they are, it shouldn't hurt */
5472 mddev->recovery = 0;
d7603b7e 5473 } else
1da177e4 5474 md_wakeup_thread(mddev->sync_thread);
d7603b7e 5475 md_new_event(mddev);
1da177e4
LT		 5476 }
5477 unlock:
5478 mddev_unlock(mddev);
5479 }
5480}
5481
75c96f85
AB		 5482static int md_notify_reboot(struct notifier_block *this,
5483 unsigned long code, void *x)
1da177e4
LT		 5484{
5485 struct list_head *tmp;
5486 mddev_t *mddev;
5487
5488 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
5489
5490 printk(KERN_INFO "md: stopping all md devices.\n");
5491
5492 ITERATE_MDDEV(mddev,tmp)
c71d4887 5493 if (mddev_trylock(mddev)) {
1da177e4 5494 do_md_stop (mddev, 1);
c71d4887
NB		 5495 mddev_unlock(mddev);
5496 }
1da177e4
LT		 5497 /*
5498 * certain more exotic SCSI devices are known to be
5499 * volatile wrt too early system reboots. While the
5500 * right place to handle this issue is the given
5501 * driver, we do want to have a safe RAID driver ...
5502 */
5503 mdelay(1000*1);
5504 }
5505 return NOTIFY_DONE;
5506}
5507
75c96f85 5508static struct notifier_block md_notifier = {
1da177e4
LT		 5509 .notifier_call = md_notify_reboot,
5510 .next = NULL,
5511 .priority = INT_MAX, /* before any real devices */
5512};
5513
5514static void md_geninit(void)
5515{
5516 struct proc_dir_entry *p;
5517
5518 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5519
5520 p = create_proc_entry("mdstat", S_IRUGO, NULL);
5521 if (p)
5522 p->proc_fops = &md_seq_fops;
5523}
5524
75c96f85 5525static int __init md_init(void)
1da177e4 5526{
1da177e4
LT		 5527 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
5528 " MD_SB_DISKS=%d\n",
5529 MD_MAJOR_VERSION, MD_MINOR_VERSION,
5530 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
bd926c63 5531 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
32a7627c 5532 BITMAP_MINOR);
1da177e4
LT		 5533
5534 if (register_blkdev(MAJOR_NR, "md"))
5535 return -1;
5536 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
5537 unregister_blkdev(MAJOR_NR, "md");
5538 return -1;
5539 }
1da177e4
LT		 5540 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
5541 md_probe, NULL, NULL);
5542 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
5543 md_probe, NULL, NULL);
5544
1da177e4
LT		 5545 register_reboot_notifier(&md_notifier);
5546 raid_table_header = register_sysctl_table(raid_root_table, 1);
5547
5548 md_geninit();
5549 return (0);
5550}
5551
5552
5553#ifndef MODULE
5554
5555/*
5556 * Searches all registered partitions for autorun RAID arrays
5557 * at boot time.
5558 */
5559static dev_t detected_devices[128];
5560static int dev_cnt;
5561
5562void md_autodetect_dev(dev_t dev)
5563{
5564 if (dev_cnt >= 0 && dev_cnt < 127)
5565 detected_devices[dev_cnt++] = dev;
5566}
5567
5568
5569static void autostart_arrays(int part)
5570{
5571 mdk_rdev_t *rdev;
5572 int i;
5573
5574 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
5575
5576 for (i = 0; i < dev_cnt; i++) {
5577 dev_t dev = detected_devices[i];
5578
5579 rdev = md_import_device(dev,0, 0);
5580 if (IS_ERR(rdev))
5581 continue;
5582
b2d444d7 5583 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 5584 MD_BUG();
5585 continue;
5586 }
5587 list_add(&rdev->same_set, &pending_raid_disks);
5588 }
5589 dev_cnt = 0;
5590
5591 autorun_devices(part);
5592}
5593
5594#endif
5595
5596static __exit void md_exit(void)
5597{
5598 mddev_t *mddev;
5599 struct list_head *tmp;
8ab5e4c1 5600
1da177e4
LT		 5601 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
5602 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
1da177e4
LT		 5603
5604 unregister_blkdev(MAJOR_NR,"md");
5605 unregister_blkdev(mdp_major, "mdp");
5606 unregister_reboot_notifier(&md_notifier);
5607 unregister_sysctl_table(raid_table_header);
5608 remove_proc_entry("mdstat", NULL);
5609 ITERATE_MDDEV(mddev,tmp) {
5610 struct gendisk *disk = mddev->gendisk;
5611 if (!disk)
5612 continue;
5613 export_array(mddev);
5614 del_gendisk(disk);
5615 put_disk(disk);
5616 mddev->gendisk = NULL;
5617 mddev_put(mddev);
5618 }
5619}
5620
5621module_init(md_init)
5622module_exit(md_exit)
5623
f91de92e
N		 5624static int get_ro(char *buffer, struct kernel_param *kp)
5625{
5626 return sprintf(buffer, "%d", start_readonly);
5627}
5628static int set_ro(const char *val, struct kernel_param *kp)
5629{
5630 char *e;
5631 int num = simple_strtoul(val, &e, 10);
5632 if (*val && (*e == '\0' || *e == '\n')) {
5633 start_readonly = num;
4dbcdc75 5634 return 0;
f91de92e
N		 5635 }
5636 return -EINVAL;
5637}
5638
80ca3a44
N		 5639module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
5640module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6ff8d8ec 5641
f91de92e 5642
1da177e4
LT		 5643EXPORT_SYMBOL(register_md_personality);
5644EXPORT_SYMBOL(unregister_md_personality);
5645EXPORT_SYMBOL(md_error);
5646EXPORT_SYMBOL(md_done_sync);
5647EXPORT_SYMBOL(md_write_start);
5648EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 5649EXPORT_SYMBOL(md_register_thread);
5650EXPORT_SYMBOL(md_unregister_thread);
5651EXPORT_SYMBOL(md_wakeup_thread);
1da177e4
LT		 5652EXPORT_SYMBOL(md_check_recovery);
5653MODULE_LICENSE("GPL");
aa1595e9 5654MODULE_ALIAS("md");
72008652 5655MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
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