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[PATCH] md: add another COMPAT_IOCTL for md
[linux-2.6-block.git] / drivers / md / md.c
CommitLineData
1da177e4
LT		 1/*
2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
4
5 completely rewritten, based on the MD driver code from Marc Zyngier
6
7 Changes:
8
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
16
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
19
20 Neil Brown <neilb@cse.unsw.edu.au>.
21
32a7627c
N		 22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
24
1da177e4
LT		 25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
28 any later version.
29
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
33*/
34
35#include <linux/module.h>
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
3a0f5bbb
N		 392 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
393 printk("md: super_written gets error=%d, uptodate=%d\n",
394 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
395 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
a9701a30 396 md_error(mddev, rdev);
3a0f5bbb 397 }
7bfa19f2 398
a9701a30
N		 399 if (atomic_dec_and_test(&mddev->pending_writes))
400 wake_up(&mddev->sb_wait);
f8b58edf 401 bio_put(bio);
7bfa19f2
N		 402 return 0;
403}
404
a9701a30
N		 405static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
406{
407 struct bio *bio2 = bio->bi_private;
408 mdk_rdev_t *rdev = bio2->bi_private;
409 mddev_t *mddev = rdev->mddev;
410 if (bio->bi_size)
411 return 1;
412
413 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
414 error == -EOPNOTSUPP) {
415 unsigned long flags;
416 /* barriers don't appear to be supported :-( */
417 set_bit(BarriersNotsupp, &rdev->flags);
418 mddev->barriers_work = 0;
419 spin_lock_irqsave(&mddev->write_lock, flags);
420 bio2->bi_next = mddev->biolist;
421 mddev->biolist = bio2;
422 spin_unlock_irqrestore(&mddev->write_lock, flags);
423 wake_up(&mddev->sb_wait);
424 bio_put(bio);
425 return 0;
426 }
427 bio_put(bio2);
428 bio->bi_private = rdev;
429 return super_written(bio, bytes_done, error);
430}
431
7bfa19f2
N		 432void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
433 sector_t sector, int size, struct page *page)
434{
435 /* write first size bytes of page to sector of rdev
436 * Increment mddev->pending_writes before returning
437 * and decrement it on completion, waking up sb_wait
438 * if zero is reached.
439 * If an error occurred, call md_error
a9701a30
N		 440 *
441 * As we might need to resubmit the request if BIO_RW_BARRIER
442 * causes ENOTSUPP, we allocate a spare bio...
7bfa19f2
N		 443 */
444 struct bio *bio = bio_alloc(GFP_NOIO, 1);
a9701a30 445 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
7bfa19f2
N		 446
447 bio->bi_bdev = rdev->bdev;
448 bio->bi_sector = sector;
449 bio_add_page(bio, page, size, 0);
450 bio->bi_private = rdev;
451 bio->bi_end_io = super_written;
a9701a30
N		 452 bio->bi_rw = rw;
453
7bfa19f2 454 atomic_inc(&mddev->pending_writes);
a9701a30
N		 455 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
456 struct bio *rbio;
457 rw |= (1<<BIO_RW_BARRIER);
458 rbio = bio_clone(bio, GFP_NOIO);
459 rbio->bi_private = bio;
460 rbio->bi_end_io = super_written_barrier;
461 submit_bio(rw, rbio);
462 } else
463 submit_bio(rw, bio);
464}
465
466void md_super_wait(mddev_t *mddev)
467{
468 /* wait for all superblock writes that were scheduled to complete.
469 * if any had to be retried (due to BARRIER problems), retry them
470 */
471 DEFINE_WAIT(wq);
472 for(;;) {
473 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
474 if (atomic_read(&mddev->pending_writes)==0)
475 break;
476 while (mddev->biolist) {
477 struct bio *bio;
478 spin_lock_irq(&mddev->write_lock);
479 bio = mddev->biolist;
480 mddev->biolist = bio->bi_next ;
481 bio->bi_next = NULL;
482 spin_unlock_irq(&mddev->write_lock);
483 submit_bio(bio->bi_rw, bio);
484 }
485 schedule();
486 }
487 finish_wait(&mddev->sb_wait, &wq);
7bfa19f2
N		 488}
489
1da177e4
LT		 490static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
491{
492 if (bio->bi_size)
493 return 1;
494
495 complete((struct completion*)bio->bi_private);
496 return 0;
497}
498
a654b9d8 499int sync_page_io(struct block_device *bdev, sector_t sector, int size,
1da177e4
LT		 500 struct page *page, int rw)
501{
baaa2c51 502 struct bio *bio = bio_alloc(GFP_NOIO, 1);
1da177e4
LT		 503 struct completion event;
504 int ret;
505
506 rw |= (1 << BIO_RW_SYNC);
507
508 bio->bi_bdev = bdev;
509 bio->bi_sector = sector;
510 bio_add_page(bio, page, size, 0);
511 init_completion(&event);
512 bio->bi_private = &event;
513 bio->bi_end_io = bi_complete;
514 submit_bio(rw, bio);
515 wait_for_completion(&event);
516
517 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
518 bio_put(bio);
519 return ret;
520}
a8745db2 521EXPORT_SYMBOL_GPL(sync_page_io);
1da177e4 522
0002b271 523static int read_disk_sb(mdk_rdev_t * rdev, int size)
1da177e4
LT		 524{
525 char b[BDEVNAME_SIZE];
526 if (!rdev->sb_page) {
527 MD_BUG();
528 return -EINVAL;
529 }
530 if (rdev->sb_loaded)
531 return 0;
532
533
0002b271 534 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
1da177e4
LT		 535 goto fail;
536 rdev->sb_loaded = 1;
537 return 0;
538
539fail:
540 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
541 bdevname(rdev->bdev,b));
542 return -EINVAL;
543}
544
545static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
546{
547 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
548 (sb1->set_uuid1 == sb2->set_uuid1) &&
549 (sb1->set_uuid2 == sb2->set_uuid2) &&
550 (sb1->set_uuid3 == sb2->set_uuid3))
551
552 return 1;
553
554 return 0;
555}
556
557
558static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
559{
560 int ret;
561 mdp_super_t *tmp1, *tmp2;
562
563 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
564 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
565
566 if (!tmp1 || !tmp2) {
567 ret = 0;
568 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
569 goto abort;
570 }
571
572 *tmp1 = *sb1;
573 *tmp2 = *sb2;
574
575 /*
576 * nr_disks is not constant
577 */
578 tmp1->nr_disks = 0;
579 tmp2->nr_disks = 0;
580
581 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
582 ret = 0;
583 else
584 ret = 1;
585
586abort:
990a8baf
JJ		 587 kfree(tmp1);
588 kfree(tmp2);
1da177e4
LT		 589 return ret;
590}
591
592static unsigned int calc_sb_csum(mdp_super_t * sb)
593{
594 unsigned int disk_csum, csum;
595
596 disk_csum = sb->sb_csum;
597 sb->sb_csum = 0;
598 csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
599 sb->sb_csum = disk_csum;
600 return csum;
601}
602
603
604/*
605 * Handle superblock details.
606 * We want to be able to handle multiple superblock formats
607 * so we have a common interface to them all, and an array of
608 * different handlers.
609 * We rely on user-space to write the initial superblock, and support
610 * reading and updating of superblocks.
611 * Interface methods are:
612 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
613 * loads and validates a superblock on dev.
614 * if refdev != NULL, compare superblocks on both devices
615 * Return:
616 * 0 - dev has a superblock that is compatible with refdev
617 * 1 - dev has a superblock that is compatible and newer than refdev
618 * so dev should be used as the refdev in future
619 * -EINVAL superblock incompatible or invalid
620 * -othererror e.g. -EIO
621 *
622 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
623 * Verify that dev is acceptable into mddev.
624 * The first time, mddev->raid_disks will be 0, and data from
625 * dev should be merged in. Subsequent calls check that dev
626 * is new enough. Return 0 or -EINVAL
627 *
628 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
629 * Update the superblock for rdev with data in mddev
630 * This does not write to disc.
631 *
632 */
633
634struct super_type {
635 char *name;
636 struct module *owner;
637 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
638 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
639 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
640};
641
642/*
643 * load_super for 0.90.0
644 */
645static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
646{
647 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
648 mdp_super_t *sb;
649 int ret;
650 sector_t sb_offset;
651
652 /*
653 * Calculate the position of the superblock,
654 * it's at the end of the disk.
655 *
656 * It also happens to be a multiple of 4Kb.
657 */
658 sb_offset = calc_dev_sboffset(rdev->bdev);
659 rdev->sb_offset = sb_offset;
660
0002b271 661 ret = read_disk_sb(rdev, MD_SB_BYTES);
1da177e4
LT		 662 if (ret) return ret;
663
664 ret = -EINVAL;
665
666 bdevname(rdev->bdev, b);
667 sb = (mdp_super_t*)page_address(rdev->sb_page);
668
669 if (sb->md_magic != MD_SB_MAGIC) {
670 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
671 b);
672 goto abort;
673 }
674
675 if (sb->major_version != 0 ||
f6705578
N		 676 sb->minor_version < 90 ||
677 sb->minor_version > 91) {
1da177e4
LT		 678 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
679 sb->major_version, sb->minor_version,
680 b);
681 goto abort;
682 }
683
684 if (sb->raid_disks <= 0)
685 goto abort;
686
687 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
688 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
689 b);
690 goto abort;
691 }
692
693 rdev->preferred_minor = sb->md_minor;
694 rdev->data_offset = 0;
0002b271 695 rdev->sb_size = MD_SB_BYTES;
1da177e4
LT		 696
697 if (sb->level == LEVEL_MULTIPATH)
698 rdev->desc_nr = -1;
699 else
700 rdev->desc_nr = sb->this_disk.number;
701
702 if (refdev == 0)
703 ret = 1;
704 else {
705 __u64 ev1, ev2;
706 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
707 if (!uuid_equal(refsb, sb)) {
708 printk(KERN_WARNING "md: %s has different UUID to %s\n",
709 b, bdevname(refdev->bdev,b2));
710 goto abort;
711 }
712 if (!sb_equal(refsb, sb)) {
713 printk(KERN_WARNING "md: %s has same UUID"
714 " but different superblock to %s\n",
715 b, bdevname(refdev->bdev, b2));
716 goto abort;
717 }
718 ev1 = md_event(sb);
719 ev2 = md_event(refsb);
720 if (ev1 > ev2)
721 ret = 1;
722 else
723 ret = 0;
724 }
725 rdev->size = calc_dev_size(rdev, sb->chunk_size);
726
2bf071bf
N		 727 if (rdev->size < sb->size && sb->level > 1)
728 /* "this cannot possibly happen" ... */
729 ret = -EINVAL;
730
1da177e4
LT		 731 abort:
732 return ret;
733}
734
735/*
736 * validate_super for 0.90.0
737 */
738static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
739{
740 mdp_disk_t *desc;
741 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
07d84d10 742 __u64 ev1 = md_event(sb);
1da177e4 743
41158c7e 744 rdev->raid_disk = -1;
b2d444d7 745 rdev->flags = 0;
1da177e4
LT		 746 if (mddev->raid_disks == 0) {
747 mddev->major_version = 0;
748 mddev->minor_version = sb->minor_version;
749 mddev->patch_version = sb->patch_version;
750 mddev->persistent = ! sb->not_persistent;
751 mddev->chunk_size = sb->chunk_size;
752 mddev->ctime = sb->ctime;
753 mddev->utime = sb->utime;
754 mddev->level = sb->level;
d9d166c2 755 mddev->clevel[0] = 0;
1da177e4
LT		 756 mddev->layout = sb->layout;
757 mddev->raid_disks = sb->raid_disks;
758 mddev->size = sb->size;
07d84d10 759 mddev->events = ev1;
9223214e 760 mddev->bitmap_offset = 0;
36fa3063 761 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
1da177e4 762
f6705578
N		 763 if (mddev->minor_version >= 91) {
764 mddev->reshape_position = sb->reshape_position;
765 mddev->delta_disks = sb->delta_disks;
766 mddev->new_level = sb->new_level;
767 mddev->new_layout = sb->new_layout;
768 mddev->new_chunk = sb->new_chunk;
769 } else {
770 mddev->reshape_position = MaxSector;
771 mddev->delta_disks = 0;
772 mddev->new_level = mddev->level;
773 mddev->new_layout = mddev->layout;
774 mddev->new_chunk = mddev->chunk_size;
775 }
776
1da177e4
LT		 777 if (sb->state & (1<<MD_SB_CLEAN))
778 mddev->recovery_cp = MaxSector;
779 else {
780 if (sb->events_hi == sb->cp_events_hi &&
781 sb->events_lo == sb->cp_events_lo) {
782 mddev->recovery_cp = sb->recovery_cp;
783 } else
784 mddev->recovery_cp = 0;
785 }
786
787 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
788 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
789 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
790 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
791
792 mddev->max_disks = MD_SB_DISKS;
a654b9d8
N		 793
794 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
795 mddev->bitmap_file == NULL) {
c5a10f62
N		 796 if (mddev->level != 1 && mddev->level != 4
797 && mddev->level != 5 && mddev->level != 6
6cce3b23 798 && mddev->level != 10) {
a654b9d8 799 /* FIXME use a better test */
6cce3b23 800 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
a654b9d8
N		 801 return -EINVAL;
802 }
36fa3063 803 mddev->bitmap_offset = mddev->default_bitmap_offset;
a654b9d8
N		 804 }
805
41158c7e
N		 806 } else if (mddev->pers == NULL) {
807 /* Insist on good event counter while assembling */
1da177e4
LT		 808 ++ev1;
809 if (ev1 < mddev->events)
810 return -EINVAL;
41158c7e
N		 811 } else if (mddev->bitmap) {
812 /* if adding to array with a bitmap, then we can accept an
813 * older device ... but not too old.
814 */
41158c7e
N		 815 if (ev1 < mddev->bitmap->events_cleared)
816 return 0;
07d84d10
N		 817 } else {
818 if (ev1 < mddev->events)
819 /* just a hot-add of a new device, leave raid_disk at -1 */
820 return 0;
821 }
41158c7e 822
1da177e4 823 if (mddev->level != LEVEL_MULTIPATH) {
1da177e4
LT		 824 desc = sb->disks + rdev->desc_nr;
825
826 if (desc->state & (1<<MD_DISK_FAULTY))
b2d444d7 827 set_bit(Faulty, &rdev->flags);
7c7546cc
N		 828 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
829 desc->raid_disk < mddev->raid_disks */) {
b2d444d7 830 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 831 rdev->raid_disk = desc->raid_disk;
832 }
8ddf9efe
N		 833 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
834 set_bit(WriteMostly, &rdev->flags);
41158c7e 835 } else /* MULTIPATH are always insync */
b2d444d7 836 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 837 return 0;
838}
839
840/*
841 * sync_super for 0.90.0
842 */
843static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
844{
845 mdp_super_t *sb;
846 struct list_head *tmp;
847 mdk_rdev_t *rdev2;
848 int next_spare = mddev->raid_disks;
19133a42 849
1da177e4
LT		 850
851 /* make rdev->sb match mddev data..
852 *
853 * 1/ zero out disks
854 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
855 * 3/ any empty disks < next_spare become removed
856 *
857 * disks[0] gets initialised to REMOVED because
858 * we cannot be sure from other fields if it has
859 * been initialised or not.
860 */
861 int i;
862 int active=0, working=0,failed=0,spare=0,nr_disks=0;
863
61181565
N		 864 rdev->sb_size = MD_SB_BYTES;
865
1da177e4
LT		 866 sb = (mdp_super_t*)page_address(rdev->sb_page);
867
868 memset(sb, 0, sizeof(*sb));
869
870 sb->md_magic = MD_SB_MAGIC;
871 sb->major_version = mddev->major_version;
1da177e4
LT		 872 sb->patch_version = mddev->patch_version;
873 sb->gvalid_words = 0; /* ignored */
874 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
875 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
876 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
877 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
878
879 sb->ctime = mddev->ctime;
880 sb->level = mddev->level;
881 sb->size = mddev->size;
882 sb->raid_disks = mddev->raid_disks;
883 sb->md_minor = mddev->md_minor;
884 sb->not_persistent = !mddev->persistent;
885 sb->utime = mddev->utime;
886 sb->state = 0;
887 sb->events_hi = (mddev->events>>32);
888 sb->events_lo = (u32)mddev->events;
889
f6705578
N		 890 if (mddev->reshape_position == MaxSector)
891 sb->minor_version = 90;
892 else {
893 sb->minor_version = 91;
894 sb->reshape_position = mddev->reshape_position;
895 sb->new_level = mddev->new_level;
896 sb->delta_disks = mddev->delta_disks;
897 sb->new_layout = mddev->new_layout;
898 sb->new_chunk = mddev->new_chunk;
899 }
900 mddev->minor_version = sb->minor_version;
1da177e4
LT		 901 if (mddev->in_sync)
902 {
903 sb->recovery_cp = mddev->recovery_cp;
904 sb->cp_events_hi = (mddev->events>>32);
905 sb->cp_events_lo = (u32)mddev->events;
906 if (mddev->recovery_cp == MaxSector)
907 sb->state = (1<< MD_SB_CLEAN);
908 } else
909 sb->recovery_cp = 0;
910
911 sb->layout = mddev->layout;
912 sb->chunk_size = mddev->chunk_size;
913
a654b9d8
N		 914 if (mddev->bitmap && mddev->bitmap_file == NULL)
915 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
916
1da177e4
LT		 917 sb->disks[0].state = (1<<MD_DISK_REMOVED);
918 ITERATE_RDEV(mddev,rdev2,tmp) {
919 mdp_disk_t *d;
86e6ffdd 920 int desc_nr;
b2d444d7
N		 921 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
922 && !test_bit(Faulty, &rdev2->flags))
86e6ffdd 923 desc_nr = rdev2->raid_disk;
1da177e4 924 else
86e6ffdd 925 desc_nr = next_spare++;
19133a42 926 rdev2->desc_nr = desc_nr;
1da177e4
LT		 927 d = &sb->disks[rdev2->desc_nr];
928 nr_disks++;
929 d->number = rdev2->desc_nr;
930 d->major = MAJOR(rdev2->bdev->bd_dev);
931 d->minor = MINOR(rdev2->bdev->bd_dev);
b2d444d7
N		 932 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
933 && !test_bit(Faulty, &rdev2->flags))
1da177e4
LT		 934 d->raid_disk = rdev2->raid_disk;
935 else
936 d->raid_disk = rdev2->desc_nr; /* compatibility */
1be7892f 937 if (test_bit(Faulty, &rdev2->flags))
1da177e4 938 d->state = (1<<MD_DISK_FAULTY);
1be7892f 939 else if (test_bit(In_sync, &rdev2->flags)) {
1da177e4
LT		 940 d->state = (1<<MD_DISK_ACTIVE);
941 d->state |= (1<<MD_DISK_SYNC);
942 active++;
943 working++;
944 } else {
945 d->state = 0;
946 spare++;
947 working++;
948 }
8ddf9efe
N		 949 if (test_bit(WriteMostly, &rdev2->flags))
950 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4 951 }
1da177e4
LT		 952 /* now set the "removed" and "faulty" bits on any missing devices */
953 for (i=0 ; i < mddev->raid_disks ; i++) {
954 mdp_disk_t *d = &sb->disks[i];
955 if (d->state == 0 && d->number == 0) {
956 d->number = i;
957 d->raid_disk = i;
958 d->state = (1<<MD_DISK_REMOVED);
959 d->state |= (1<<MD_DISK_FAULTY);
960 failed++;
961 }
962 }
963 sb->nr_disks = nr_disks;
964 sb->active_disks = active;
965 sb->working_disks = working;
966 sb->failed_disks = failed;
967 sb->spare_disks = spare;
968
969 sb->this_disk = sb->disks[rdev->desc_nr];
970 sb->sb_csum = calc_sb_csum(sb);
971}
972
973/*
974 * version 1 superblock
975 */
976
977static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
978{
979 unsigned int disk_csum, csum;
980 unsigned long long newcsum;
981 int size = 256 + le32_to_cpu(sb->max_dev)*2;
982 unsigned int *isuper = (unsigned int*)sb;
983 int i;
984
985 disk_csum = sb->sb_csum;
986 sb->sb_csum = 0;
987 newcsum = 0;
988 for (i=0; size>=4; size -= 4 )
989 newcsum += le32_to_cpu(*isuper++);
990
991 if (size == 2)
992 newcsum += le16_to_cpu(*(unsigned short*) isuper);
993
994 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
995 sb->sb_csum = disk_csum;
996 return cpu_to_le32(csum);
997}
998
999static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1000{
1001 struct mdp_superblock_1 *sb;
1002 int ret;
1003 sector_t sb_offset;
1004 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 1005 int bmask;
1da177e4
LT		 1006
1007 /*
1008 * Calculate the position of the superblock.
1009 * It is always aligned to a 4K boundary and
1010 * depeding on minor_version, it can be:
1011 * 0: At least 8K, but less than 12K, from end of device
1012 * 1: At start of device
1013 * 2: 4K from start of device.
1014 */
1015 switch(minor_version) {
1016 case 0:
1017 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1018 sb_offset -= 8*2;
39730960 1019 sb_offset &= ~(sector_t)(4*2-1);
1da177e4
LT		 1020 /* convert from sectors to K */
1021 sb_offset /= 2;
1022 break;
1023 case 1:
1024 sb_offset = 0;
1025 break;
1026 case 2:
1027 sb_offset = 4;
1028 break;
1029 default:
1030 return -EINVAL;
1031 }
1032 rdev->sb_offset = sb_offset;
1033
0002b271
N		 1034 /* superblock is rarely larger than 1K, but it can be larger,
1035 * and it is safe to read 4k, so we do that
1036 */
1037 ret = read_disk_sb(rdev, 4096);
1da177e4
LT		 1038 if (ret) return ret;
1039
1040
1041 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1042
1043 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1044 sb->major_version != cpu_to_le32(1) ||
1045 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1046 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
71c0805c 1047 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT		 1048 return -EINVAL;
1049
1050 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1051 printk("md: invalid superblock checksum on %s\n",
1052 bdevname(rdev->bdev,b));
1053 return -EINVAL;
1054 }
1055 if (le64_to_cpu(sb->data_size) < 10) {
1056 printk("md: data_size too small on %s\n",
1057 bdevname(rdev->bdev,b));
1058 return -EINVAL;
1059 }
1060 rdev->preferred_minor = 0xffff;
1061 rdev->data_offset = le64_to_cpu(sb->data_offset);
4dbcdc75 1062 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1da177e4 1063
0002b271 1064 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
720a3dc3 1065 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
0002b271
N		 1066 if (rdev->sb_size & bmask)
1067 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1068
31b65a0d
N		 1069 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1070 rdev->desc_nr = -1;
1071 else
1072 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1073
1da177e4 1074 if (refdev == 0)
8ed75463 1075 ret = 1;
1da177e4
LT		 1076 else {
1077 __u64 ev1, ev2;
1078 struct mdp_superblock_1 *refsb =
1079 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1080
1081 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1082 sb->level != refsb->level ||
1083 sb->layout != refsb->layout ||
1084 sb->chunksize != refsb->chunksize) {
1085 printk(KERN_WARNING "md: %s has strangely different"
1086 " superblock to %s\n",
1087 bdevname(rdev->bdev,b),
1088 bdevname(refdev->bdev,b2));
1089 return -EINVAL;
1090 }
1091 ev1 = le64_to_cpu(sb->events);
1092 ev2 = le64_to_cpu(refsb->events);
1093
1094 if (ev1 > ev2)
8ed75463
N		 1095 ret = 1;
1096 else
1097 ret = 0;
1da177e4
LT		 1098 }
1099 if (minor_version)
1100 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1101 else
1102 rdev->size = rdev->sb_offset;
1103 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1104 return -EINVAL;
1105 rdev->size = le64_to_cpu(sb->data_size)/2;
1106 if (le32_to_cpu(sb->chunksize))
1107 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
2bf071bf
N		 1108
1109 if (le32_to_cpu(sb->size) > rdev->size*2)
1110 return -EINVAL;
8ed75463 1111 return ret;
1da177e4
LT		 1112}
1113
1114static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1115{
1116 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
07d84d10 1117 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4 1118
41158c7e 1119 rdev->raid_disk = -1;
b2d444d7 1120 rdev->flags = 0;
1da177e4
LT		 1121 if (mddev->raid_disks == 0) {
1122 mddev->major_version = 1;
1123 mddev->patch_version = 0;
1124 mddev->persistent = 1;
1125 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1126 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1127 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1128 mddev->level = le32_to_cpu(sb->level);
d9d166c2 1129 mddev->clevel[0] = 0;
1da177e4
LT		 1130 mddev->layout = le32_to_cpu(sb->layout);
1131 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1132 mddev->size = le64_to_cpu(sb->size)/2;
07d84d10 1133 mddev->events = ev1;
9223214e 1134 mddev->bitmap_offset = 0;
29fc7e3e 1135 mddev->default_bitmap_offset = 1024 >> 9;
1da177e4
LT		 1136
1137 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1138 memcpy(mddev->uuid, sb->set_uuid, 16);
1139
1140 mddev->max_disks = (4096-256)/2;
a654b9d8 1141
71c0805c 1142 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
a654b9d8 1143 mddev->bitmap_file == NULL ) {
6cce3b23
N		 1144 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
1145 && mddev->level != 10) {
1146 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
a654b9d8
N		 1147 return -EINVAL;
1148 }
1149 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1150 }
f6705578
N		 1151 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1152 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1153 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1154 mddev->new_level = le32_to_cpu(sb->new_level);
1155 mddev->new_layout = le32_to_cpu(sb->new_layout);
1156 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1157 } else {
1158 mddev->reshape_position = MaxSector;
1159 mddev->delta_disks = 0;
1160 mddev->new_level = mddev->level;
1161 mddev->new_layout = mddev->layout;
1162 mddev->new_chunk = mddev->chunk_size;
1163 }
1164
41158c7e
N		 1165 } else if (mddev->pers == NULL) {
1166 /* Insist of good event counter while assembling */
1da177e4
LT		 1167 ++ev1;
1168 if (ev1 < mddev->events)
1169 return -EINVAL;
41158c7e
N		 1170 } else if (mddev->bitmap) {
1171 /* If adding to array with a bitmap, then we can accept an
1172 * older device, but not too old.
1173 */
41158c7e
N		 1174 if (ev1 < mddev->bitmap->events_cleared)
1175 return 0;
07d84d10
N		 1176 } else {
1177 if (ev1 < mddev->events)
1178 /* just a hot-add of a new device, leave raid_disk at -1 */
1179 return 0;
1180 }
1da177e4
LT		 1181 if (mddev->level != LEVEL_MULTIPATH) {
1182 int role;
1da177e4
LT		 1183 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1184 switch(role) {
1185 case 0xffff: /* spare */
1da177e4
LT		 1186 break;
1187 case 0xfffe: /* faulty */
b2d444d7 1188 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 1189 break;
1190 default:
5fd6c1dc
N		 1191 if ((le32_to_cpu(sb->feature_map) &
1192 MD_FEATURE_RECOVERY_OFFSET))
1193 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1194 else
1195 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1196 rdev->raid_disk = role;
1197 break;
1198 }
8ddf9efe
N		 1199 if (sb->devflags & WriteMostly1)
1200 set_bit(WriteMostly, &rdev->flags);
41158c7e 1201 } else /* MULTIPATH are always insync */
b2d444d7 1202 set_bit(In_sync, &rdev->flags);
41158c7e 1203
1da177e4
LT		 1204 return 0;
1205}
1206
1207static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1208{
1209 struct mdp_superblock_1 *sb;
1210 struct list_head *tmp;
1211 mdk_rdev_t *rdev2;
1212 int max_dev, i;
1213 /* make rdev->sb match mddev and rdev data. */
1214
1215 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1216
1217 sb->feature_map = 0;
1218 sb->pad0 = 0;
5fd6c1dc 1219 sb->recovery_offset = cpu_to_le64(0);
1da177e4
LT		 1220 memset(sb->pad1, 0, sizeof(sb->pad1));
1221 memset(sb->pad2, 0, sizeof(sb->pad2));
1222 memset(sb->pad3, 0, sizeof(sb->pad3));
1223
1224 sb->utime = cpu_to_le64((__u64)mddev->utime);
1225 sb->events = cpu_to_le64(mddev->events);
1226 if (mddev->in_sync)
1227 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1228 else
1229 sb->resync_offset = cpu_to_le64(0);
1230
4dbcdc75
N		 1231 sb->cnt_corrected_read = atomic_read(&rdev->corrected_errors);
1232
f0ca340c 1233 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
29fc7e3e 1234 sb->size = cpu_to_le64(mddev->size<<1);
f0ca340c 1235
a654b9d8
N		 1236 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1237 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
71c0805c 1238 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8 1239 }
5fd6c1dc
N		 1240
1241 if (rdev->raid_disk >= 0 &&
1242 !test_bit(In_sync, &rdev->flags) &&
1243 rdev->recovery_offset > 0) {
1244 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1245 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1246 }
1247
f6705578
N		 1248 if (mddev->reshape_position != MaxSector) {
1249 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1250 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1251 sb->new_layout = cpu_to_le32(mddev->new_layout);
1252 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1253 sb->new_level = cpu_to_le32(mddev->new_level);
1254 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1255 }
a654b9d8 1256
1da177e4
LT		 1257 max_dev = 0;
1258 ITERATE_RDEV(mddev,rdev2,tmp)
1259 if (rdev2->desc_nr+1 > max_dev)
1260 max_dev = rdev2->desc_nr+1;
1261
1262 sb->max_dev = cpu_to_le32(max_dev);
1263 for (i=0; i<max_dev;i++)
1264 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1265
1266 ITERATE_RDEV(mddev,rdev2,tmp) {
1267 i = rdev2->desc_nr;
b2d444d7 1268 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1269 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1270 else if (test_bit(In_sync, &rdev2->flags))
1da177e4 1271 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
5fd6c1dc
N		 1272 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1273 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1da177e4
LT		 1274 else
1275 sb->dev_roles[i] = cpu_to_le16(0xffff);
1276 }
1277
1da177e4
LT		 1278 sb->sb_csum = calc_sb_1_csum(sb);
1279}
1280
1281
75c96f85 1282static struct super_type super_types[] = {
1da177e4
LT		 1283 [0] = {
1284 .name = "0.90.0",
1285 .owner = THIS_MODULE,
1286 .load_super = super_90_load,
1287 .validate_super = super_90_validate,
1288 .sync_super = super_90_sync,
1289 },
1290 [1] = {
1291 .name = "md-1",
1292 .owner = THIS_MODULE,
1293 .load_super = super_1_load,
1294 .validate_super = super_1_validate,
1295 .sync_super = super_1_sync,
1296 },
1297};
1298
1299static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1300{
1301 struct list_head *tmp;
1302 mdk_rdev_t *rdev;
1303
1304 ITERATE_RDEV(mddev,rdev,tmp)
1305 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1306 return rdev;
1307
1308 return NULL;
1309}
1310
1311static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1312{
1313 struct list_head *tmp;
1314 mdk_rdev_t *rdev;
1315
1316 ITERATE_RDEV(mddev1,rdev,tmp)
1317 if (match_dev_unit(mddev2, rdev))
1318 return 1;
1319
1320 return 0;
1321}
1322
1323static LIST_HEAD(pending_raid_disks);
1324
1325static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1326{
1327 mdk_rdev_t *same_pdev;
1328 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
f637b9f9 1329 struct kobject *ko;
1edf80d3 1330 char *s;
1da177e4
LT		 1331
1332 if (rdev->mddev) {
1333 MD_BUG();
1334 return -EINVAL;
1335 }
2bf071bf
N		 1336 /* make sure rdev->size exceeds mddev->size */
1337 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1338 if (mddev->pers)
1339 /* Cannot change size, so fail */
1340 return -ENOSPC;
1341 else
1342 mddev->size = rdev->size;
1343 }
1da177e4
LT		 1344 same_pdev = match_dev_unit(mddev, rdev);
1345 if (same_pdev)
1346 printk(KERN_WARNING
1347 "%s: WARNING: %s appears to be on the same physical"
1348 " disk as %s. True\n protection against single-disk"
1349 " failure might be compromised.\n",
1350 mdname(mddev), bdevname(rdev->bdev,b),
1351 bdevname(same_pdev->bdev,b2));
1352
1353 /* Verify rdev->desc_nr is unique.
1354 * If it is -1, assign a free number, else
1355 * check number is not in use
1356 */
1357 if (rdev->desc_nr < 0) {
1358 int choice = 0;
1359 if (mddev->pers) choice = mddev->raid_disks;
1360 while (find_rdev_nr(mddev, choice))
1361 choice++;
1362 rdev->desc_nr = choice;
1363 } else {
1364 if (find_rdev_nr(mddev, rdev->desc_nr))
1365 return -EBUSY;
1366 }
19133a42
N		 1367 bdevname(rdev->bdev,b);
1368 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1369 return -ENOMEM;
1edf80d3
NB		 1370 while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
1371 *s = '!';
1da177e4
LT		 1372
1373 list_add(&rdev->same_set, &mddev->disks);
1374 rdev->mddev = mddev;
19133a42 1375 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 1376
9c791977 1377 rdev->kobj.parent = &mddev->kobj;
86e6ffdd
N		 1378 kobject_add(&rdev->kobj);
1379
f637b9f9
N		 1380 if (rdev->bdev->bd_part)
1381 ko = &rdev->bdev->bd_part->kobj;
1382 else
1383 ko = &rdev->bdev->bd_disk->kobj;
1384 sysfs_create_link(&rdev->kobj, ko, "block");
5463c790 1385 bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
1da177e4
LT		 1386 return 0;
1387}
1388
1389static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1390{
1391 char b[BDEVNAME_SIZE];
1392 if (!rdev->mddev) {
1393 MD_BUG();
1394 return;
1395 }
5463c790 1396 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1da177e4
LT		 1397 list_del_init(&rdev->same_set);
1398 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1399 rdev->mddev = NULL;
86e6ffdd
N		 1400 sysfs_remove_link(&rdev->kobj, "block");
1401 kobject_del(&rdev->kobj);
1da177e4
LT		 1402}
1403
1404/*
1405 * prevent the device from being mounted, repartitioned or
1406 * otherwise reused by a RAID array (or any other kernel
1407 * subsystem), by bd_claiming the device.
1408 */
1409static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1410{
1411 int err = 0;
1412 struct block_device *bdev;
1413 char b[BDEVNAME_SIZE];
1414
663d440e 1415 bdev = open_partition_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1da177e4
LT		 1416 if (IS_ERR(bdev)) {
1417 printk(KERN_ERR "md: could not open %s.\n",
1418 __bdevname(dev, b));
1419 return PTR_ERR(bdev);
1420 }
1421 err = bd_claim(bdev, rdev);
1422 if (err) {
1423 printk(KERN_ERR "md: could not bd_claim %s.\n",
1424 bdevname(bdev, b));
663d440e 1425 blkdev_put_partition(bdev);
1da177e4
LT		 1426 return err;
1427 }
1428 rdev->bdev = bdev;
1429 return err;
1430}
1431
1432static void unlock_rdev(mdk_rdev_t *rdev)
1433{
1434 struct block_device *bdev = rdev->bdev;
1435 rdev->bdev = NULL;
1436 if (!bdev)
1437 MD_BUG();
1438 bd_release(bdev);
663d440e 1439 blkdev_put_partition(bdev);
1da177e4
LT		 1440}
1441
1442void md_autodetect_dev(dev_t dev);
1443
1444static void export_rdev(mdk_rdev_t * rdev)
1445{
1446 char b[BDEVNAME_SIZE];
1447 printk(KERN_INFO "md: export_rdev(%s)\n",
1448 bdevname(rdev->bdev,b));
1449 if (rdev->mddev)
1450 MD_BUG();
1451 free_disk_sb(rdev);
1452 list_del_init(&rdev->same_set);
1453#ifndef MODULE
1454 md_autodetect_dev(rdev->bdev->bd_dev);
1455#endif
1456 unlock_rdev(rdev);
86e6ffdd 1457 kobject_put(&rdev->kobj);
1da177e4
LT		 1458}
1459
1460static void kick_rdev_from_array(mdk_rdev_t * rdev)
1461{
1462 unbind_rdev_from_array(rdev);
1463 export_rdev(rdev);
1464}
1465
1466static void export_array(mddev_t *mddev)
1467{
1468 struct list_head *tmp;
1469 mdk_rdev_t *rdev;
1470
1471 ITERATE_RDEV(mddev,rdev,tmp) {
1472 if (!rdev->mddev) {
1473 MD_BUG();
1474 continue;
1475 }
1476 kick_rdev_from_array(rdev);
1477 }
1478 if (!list_empty(&mddev->disks))
1479 MD_BUG();
1480 mddev->raid_disks = 0;
1481 mddev->major_version = 0;
1482}
1483
1484static void print_desc(mdp_disk_t *desc)
1485{
1486 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1487 desc->major,desc->minor,desc->raid_disk,desc->state);
1488}
1489
1490static void print_sb(mdp_super_t *sb)
1491{
1492 int i;
1493
1494 printk(KERN_INFO
1495 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1496 sb->major_version, sb->minor_version, sb->patch_version,
1497 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1498 sb->ctime);
1499 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1500 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1501 sb->md_minor, sb->layout, sb->chunk_size);
1502 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1503 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1504 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1505 sb->failed_disks, sb->spare_disks,
1506 sb->sb_csum, (unsigned long)sb->events_lo);
1507
1508 printk(KERN_INFO);
1509 for (i = 0; i < MD_SB_DISKS; i++) {
1510 mdp_disk_t *desc;
1511
1512 desc = sb->disks + i;
1513 if (desc->number || desc->major || desc->minor ||
1514 desc->raid_disk || (desc->state && (desc->state != 4))) {
1515 printk(" D %2d: ", i);
1516 print_desc(desc);
1517 }
1518 }
1519 printk(KERN_INFO "md: THIS: ");
1520 print_desc(&sb->this_disk);
1521
1522}
1523
1524static void print_rdev(mdk_rdev_t *rdev)
1525{
1526 char b[BDEVNAME_SIZE];
1527 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1528 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
b2d444d7
N		 1529 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1530 rdev->desc_nr);
1da177e4
LT		 1531 if (rdev->sb_loaded) {
1532 printk(KERN_INFO "md: rdev superblock:\n");
1533 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1534 } else
1535 printk(KERN_INFO "md: no rdev superblock!\n");
1536}
1537
5e56341d 1538static void md_print_devices(void)
1da177e4
LT		 1539{
1540 struct list_head *tmp, *tmp2;
1541 mdk_rdev_t *rdev;
1542 mddev_t *mddev;
1543 char b[BDEVNAME_SIZE];
1544
1545 printk("\n");
1546 printk("md: **********************************\n");
1547 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1548 printk("md: **********************************\n");
1549 ITERATE_MDDEV(mddev,tmp) {
1da177e4 1550
32a7627c
N		 1551 if (mddev->bitmap)
1552 bitmap_print_sb(mddev->bitmap);
1553 else
1554 printk("%s: ", mdname(mddev));
1da177e4
LT		 1555 ITERATE_RDEV(mddev,rdev,tmp2)
1556 printk("<%s>", bdevname(rdev->bdev,b));
1557 printk("\n");
1558
1559 ITERATE_RDEV(mddev,rdev,tmp2)
1560 print_rdev(rdev);
1561 }
1562 printk("md: **********************************\n");
1563 printk("\n");
1564}
1565
1566
42543769 1567static void sync_sbs(mddev_t * mddev, int nospares)
1da177e4 1568{
42543769
N		 1569 /* Update each superblock (in-memory image), but
1570 * if we are allowed to, skip spares which already
1571 * have the right event counter, or have one earlier
1572 * (which would mean they aren't being marked as dirty
1573 * with the rest of the array)
1574 */
1da177e4
LT		 1575 mdk_rdev_t *rdev;
1576 struct list_head *tmp;
1577
1578 ITERATE_RDEV(mddev,rdev,tmp) {
42543769
N		 1579 if (rdev->sb_events == mddev->events ||
1580 (nospares &&
1581 rdev->raid_disk < 0 &&
1582 (rdev->sb_events&1)==0 &&
1583 rdev->sb_events+1 == mddev->events)) {
1584 /* Don't update this superblock */
1585 rdev->sb_loaded = 2;
1586 } else {
1587 super_types[mddev->major_version].
1588 sync_super(mddev, rdev);
1589 rdev->sb_loaded = 1;
1590 }
1da177e4
LT		 1591 }
1592}
1593
850b2b42 1594static void md_update_sb(mddev_t * mddev, int force_change)
1da177e4 1595{
7bfa19f2 1596 int err;
1da177e4
LT		 1597 struct list_head *tmp;
1598 mdk_rdev_t *rdev;
06d91a5f 1599 int sync_req;
42543769 1600 int nospares = 0;
1da177e4 1601
1da177e4 1602repeat:
a9701a30 1603 spin_lock_irq(&mddev->write_lock);
84692195 1604
850b2b42
N		 1605 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1606 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1607 force_change = 1;
1608 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1609 /* just a clean<-> dirty transition, possibly leave spares alone,
1610 * though if events isn't the right even/odd, we will have to do
1611 * spares after all
1612 */
1613 nospares = 1;
1614 if (force_change)
1615 nospares = 0;
1616 if (mddev->degraded)
84692195
N		 1617 /* If the array is degraded, then skipping spares is both
1618 * dangerous and fairly pointless.
1619 * Dangerous because a device that was removed from the array
1620 * might have a event_count that still looks up-to-date,
1621 * so it can be re-added without a resync.
1622 * Pointless because if there are any spares to skip,
1623 * then a recovery will happen and soon that array won't
1624 * be degraded any more and the spare can go back to sleep then.
1625 */
850b2b42 1626 nospares = 0;
84692195 1627
06d91a5f 1628 sync_req = mddev->in_sync;
1da177e4 1629 mddev->utime = get_seconds();
42543769
N		 1630
1631 /* If this is just a dirty<->clean transition, and the array is clean
1632 * and 'events' is odd, we can roll back to the previous clean state */
850b2b42 1633 if (nospares
42543769
N		 1634 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1635 && (mddev->events & 1))
1636 mddev->events--;
1637 else {
1638 /* otherwise we have to go forward and ... */
1639 mddev->events ++;
1640 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1641 /* .. if the array isn't clean, insist on an odd 'events' */
1642 if ((mddev->events&1)==0) {
1643 mddev->events++;
1644 nospares = 0;
1645 }
1646 } else {
1647 /* otherwise insist on an even 'events' (for clean states) */
1648 if ((mddev->events&1)) {
1649 mddev->events++;
1650 nospares = 0;
1651 }
1652 }
1653 }
1da177e4
LT		 1654
1655 if (!mddev->events) {
1656 /*
1657 * oops, this 64-bit counter should never wrap.
1658 * Either we are in around ~1 trillion A.C., assuming
1659 * 1 reboot per second, or we have a bug:
1660 */
1661 MD_BUG();
1662 mddev->events --;
1663 }
42543769 1664 sync_sbs(mddev, nospares);
1da177e4
LT		 1665
1666 /*
1667 * do not write anything to disk if using
1668 * nonpersistent superblocks
1669 */
06d91a5f 1670 if (!mddev->persistent) {
850b2b42 1671 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
a9701a30 1672 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1673 wake_up(&mddev->sb_wait);
1da177e4 1674 return;
06d91a5f 1675 }
a9701a30 1676 spin_unlock_irq(&mddev->write_lock);
1da177e4
LT		 1677
1678 dprintk(KERN_INFO
1679 "md: updating %s RAID superblock on device (in sync %d)\n",
1680 mdname(mddev),mddev->in_sync);
1681
32a7627c 1682 err = bitmap_update_sb(mddev->bitmap);
1da177e4
LT		 1683 ITERATE_RDEV(mddev,rdev,tmp) {
1684 char b[BDEVNAME_SIZE];
1685 dprintk(KERN_INFO "md: ");
42543769
N		 1686 if (rdev->sb_loaded != 1)
1687 continue; /* no noise on spare devices */
b2d444d7 1688 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1689 dprintk("(skipping faulty ");
1690
1691 dprintk("%s ", bdevname(rdev->bdev,b));
b2d444d7 1692 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 1693 md_super_write(mddev,rdev,
0002b271 1694 rdev->sb_offset<<1, rdev->sb_size,
7bfa19f2
N		 1695 rdev->sb_page);
1696 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1697 bdevname(rdev->bdev,b),
1698 (unsigned long long)rdev->sb_offset);
42543769 1699 rdev->sb_events = mddev->events;
7bfa19f2 1700
1da177e4
LT		 1701 } else
1702 dprintk(")\n");
7bfa19f2 1703 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT		 1704 /* only need to write one superblock... */
1705 break;
1706 }
a9701a30 1707 md_super_wait(mddev);
850b2b42 1708 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
7bfa19f2 1709
a9701a30 1710 spin_lock_irq(&mddev->write_lock);
850b2b42
N		 1711 if (mddev->in_sync != sync_req ||
1712 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
06d91a5f 1713 /* have to write it out again */
a9701a30 1714 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N		 1715 goto repeat;
1716 }
850b2b42 1717 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
a9701a30 1718 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1719 wake_up(&mddev->sb_wait);
06d91a5f 1720
1da177e4
LT		 1721}
1722
bce74dac
N		 1723/* words written to sysfs files may, or my not, be \n terminated.
1724 * We want to accept with case. For this we use cmd_match.
1725 */
1726static int cmd_match(const char *cmd, const char *str)
1727{
1728 /* See if cmd, written into a sysfs file, matches
1729 * str. They must either be the same, or cmd can
1730 * have a trailing newline
1731 */
1732 while (*cmd && *str && *cmd == *str) {
1733 cmd++;
1734 str++;
1735 }
1736 if (*cmd == '\n')
1737 cmd++;
1738 if (*str || *cmd)
1739 return 0;
1740 return 1;
1741}
1742
86e6ffdd
N		 1743struct rdev_sysfs_entry {
1744 struct attribute attr;
1745 ssize_t (*show)(mdk_rdev_t *, char *);
1746 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1747};
1748
1749static ssize_t
96de1e66 1750state_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1751{
1752 char *sep = "";
1753 int len=0;
1754
b2d444d7 1755 if (test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 1756 len+= sprintf(page+len, "%sfaulty",sep);
1757 sep = ",";
1758 }
b2d444d7 1759 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1760 len += sprintf(page+len, "%sin_sync",sep);
1761 sep = ",";
1762 }
f655675b
N		 1763 if (test_bit(WriteMostly, &rdev->flags)) {
1764 len += sprintf(page+len, "%swrite_mostly",sep);
1765 sep = ",";
1766 }
b2d444d7
N		 1767 if (!test_bit(Faulty, &rdev->flags) &&
1768 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1769 len += sprintf(page+len, "%sspare", sep);
1770 sep = ",";
1771 }
1772 return len+sprintf(page+len, "\n");
1773}
1774
45dc2de1
N		 1775static ssize_t
1776state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1777{
1778 /* can write
1779 * faulty - simulates and error
1780 * remove - disconnects the device
f655675b
N		 1781 * writemostly - sets write_mostly
1782 * -writemostly - clears write_mostly
45dc2de1
N		 1783 */
1784 int err = -EINVAL;
1785 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1786 md_error(rdev->mddev, rdev);
1787 err = 0;
1788 } else if (cmd_match(buf, "remove")) {
1789 if (rdev->raid_disk >= 0)
1790 err = -EBUSY;
1791 else {
1792 mddev_t *mddev = rdev->mddev;
1793 kick_rdev_from_array(rdev);
850b2b42 1794 md_update_sb(mddev, 1);
45dc2de1
N		 1795 md_new_event(mddev);
1796 err = 0;
1797 }
f655675b
N		 1798 } else if (cmd_match(buf, "writemostly")) {
1799 set_bit(WriteMostly, &rdev->flags);
1800 err = 0;
1801 } else if (cmd_match(buf, "-writemostly")) {
1802 clear_bit(WriteMostly, &rdev->flags);
1803 err = 0;
45dc2de1
N		 1804 }
1805 return err ? err : len;
1806}
80ca3a44
N		 1807static struct rdev_sysfs_entry rdev_state =
1808__ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
86e6ffdd
N		 1809
1810static ssize_t
96de1e66 1811super_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1812{
1813 if (rdev->sb_loaded && rdev->sb_size) {
1814 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1815 return rdev->sb_size;
1816 } else
1817 return 0;
1818}
96de1e66
N		 1819static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1820
4dbcdc75
N		 1821static ssize_t
1822errors_show(mdk_rdev_t *rdev, char *page)
1823{
1824 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1825}
1826
1827static ssize_t
1828errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1829{
1830 char *e;
1831 unsigned long n = simple_strtoul(buf, &e, 10);
1832 if (*buf && (*e == 0 || *e == '\n')) {
1833 atomic_set(&rdev->corrected_errors, n);
1834 return len;
1835 }
1836 return -EINVAL;
1837}
1838static struct rdev_sysfs_entry rdev_errors =
80ca3a44 1839__ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
4dbcdc75 1840
014236d2
N		 1841static ssize_t
1842slot_show(mdk_rdev_t *rdev, char *page)
1843{
1844 if (rdev->raid_disk < 0)
1845 return sprintf(page, "none\n");
1846 else
1847 return sprintf(page, "%d\n", rdev->raid_disk);
1848}
1849
1850static ssize_t
1851slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1852{
1853 char *e;
1854 int slot = simple_strtoul(buf, &e, 10);
1855 if (strncmp(buf, "none", 4)==0)
1856 slot = -1;
1857 else if (e==buf || (*e && *e!= '\n'))
1858 return -EINVAL;
1859 if (rdev->mddev->pers)
1860 /* Cannot set slot in active array (yet) */
1861 return -EBUSY;
1862 if (slot >= rdev->mddev->raid_disks)
1863 return -ENOSPC;
1864 rdev->raid_disk = slot;
1865 /* assume it is working */
1866 rdev->flags = 0;
1867 set_bit(In_sync, &rdev->flags);
1868 return len;
1869}
1870
1871
1872static struct rdev_sysfs_entry rdev_slot =
80ca3a44 1873__ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
014236d2 1874
93c8cad0
N		 1875static ssize_t
1876offset_show(mdk_rdev_t *rdev, char *page)
1877{
6961ece4 1878 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
93c8cad0
N		 1879}
1880
1881static ssize_t
1882offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1883{
1884 char *e;
1885 unsigned long long offset = simple_strtoull(buf, &e, 10);
1886 if (e==buf || (*e && *e != '\n'))
1887 return -EINVAL;
1888 if (rdev->mddev->pers)
1889 return -EBUSY;
1890 rdev->data_offset = offset;
1891 return len;
1892}
1893
1894static struct rdev_sysfs_entry rdev_offset =
80ca3a44 1895__ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
93c8cad0 1896
83303b61
N		 1897static ssize_t
1898rdev_size_show(mdk_rdev_t *rdev, char *page)
1899{
1900 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1901}
1902
1903static ssize_t
1904rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1905{
1906 char *e;
1907 unsigned long long size = simple_strtoull(buf, &e, 10);
1908 if (e==buf || (*e && *e != '\n'))
1909 return -EINVAL;
1910 if (rdev->mddev->pers)
1911 return -EBUSY;
1912 rdev->size = size;
1913 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1914 rdev->mddev->size = size;
1915 return len;
1916}
1917
1918static struct rdev_sysfs_entry rdev_size =
80ca3a44 1919__ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
83303b61 1920
86e6ffdd
N		 1921static struct attribute *rdev_default_attrs[] = {
1922 &rdev_state.attr,
1923 &rdev_super.attr,
4dbcdc75 1924 &rdev_errors.attr,
014236d2 1925 &rdev_slot.attr,
93c8cad0 1926 &rdev_offset.attr,
83303b61 1927 &rdev_size.attr,
86e6ffdd
N		 1928 NULL,
1929};
1930static ssize_t
1931rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1932{
1933 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1934 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1935
1936 if (!entry->show)
1937 return -EIO;
1938 return entry->show(rdev, page);
1939}
1940
1941static ssize_t
1942rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1943 const char *page, size_t length)
1944{
1945 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1946 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1947
1948 if (!entry->store)
1949 return -EIO;
67463acb
N		 1950 if (!capable(CAP_SYS_ADMIN))
1951 return -EACCES;
86e6ffdd
N		 1952 return entry->store(rdev, page, length);
1953}
1954
1955static void rdev_free(struct kobject *ko)
1956{
1957 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1958 kfree(rdev);
1959}
1960static struct sysfs_ops rdev_sysfs_ops = {
1961 .show = rdev_attr_show,
1962 .store = rdev_attr_store,
1963};
1964static struct kobj_type rdev_ktype = {
1965 .release = rdev_free,
1966 .sysfs_ops = &rdev_sysfs_ops,
1967 .default_attrs = rdev_default_attrs,
1968};
1969
1da177e4
LT		 1970/*
1971 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1972 *
1973 * mark the device faulty if:
1974 *
1975 * - the device is nonexistent (zero size)
1976 * - the device has no valid superblock
1977 *
1978 * a faulty rdev _never_ has rdev->sb set.
1979 */
1980static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1981{
1982 char b[BDEVNAME_SIZE];
1983 int err;
1984 mdk_rdev_t *rdev;
1985 sector_t size;
1986
9ffae0cf 1987 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1da177e4
LT		 1988 if (!rdev) {
1989 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1990 return ERR_PTR(-ENOMEM);
1991 }
1da177e4
LT		 1992
1993 if ((err = alloc_disk_sb(rdev)))
1994 goto abort_free;
1995
1996 err = lock_rdev(rdev, newdev);
1997 if (err)
1998 goto abort_free;
1999
86e6ffdd
N		 2000 rdev->kobj.parent = NULL;
2001 rdev->kobj.ktype = &rdev_ktype;
2002 kobject_init(&rdev->kobj);
2003
1da177e4 2004 rdev->desc_nr = -1;
b2d444d7 2005 rdev->flags = 0;
1da177e4 2006 rdev->data_offset = 0;
42543769 2007 rdev->sb_events = 0;
1da177e4 2008 atomic_set(&rdev->nr_pending, 0);
ba22dcbf 2009 atomic_set(&rdev->read_errors, 0);
4dbcdc75 2010 atomic_set(&rdev->corrected_errors, 0);
1da177e4
LT		 2011
2012 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2013 if (!size) {
2014 printk(KERN_WARNING
2015 "md: %s has zero or unknown size, marking faulty!\n",
2016 bdevname(rdev->bdev,b));
2017 err = -EINVAL;
2018 goto abort_free;
2019 }
2020
2021 if (super_format >= 0) {
2022 err = super_types[super_format].
2023 load_super(rdev, NULL, super_minor);
2024 if (err == -EINVAL) {
2025 printk(KERN_WARNING
2026 "md: %s has invalid sb, not importing!\n",
2027 bdevname(rdev->bdev,b));
2028 goto abort_free;
2029 }
2030 if (err < 0) {
2031 printk(KERN_WARNING
2032 "md: could not read %s's sb, not importing!\n",
2033 bdevname(rdev->bdev,b));
2034 goto abort_free;
2035 }
2036 }
2037 INIT_LIST_HEAD(&rdev->same_set);
2038
2039 return rdev;
2040
2041abort_free:
2042 if (rdev->sb_page) {
2043 if (rdev->bdev)
2044 unlock_rdev(rdev);
2045 free_disk_sb(rdev);
2046 }
2047 kfree(rdev);
2048 return ERR_PTR(err);
2049}
2050
2051/*
2052 * Check a full RAID array for plausibility
2053 */
2054
2055
a757e64c 2056static void analyze_sbs(mddev_t * mddev)
1da177e4
LT		 2057{
2058 int i;
2059 struct list_head *tmp;
2060 mdk_rdev_t *rdev, *freshest;
2061 char b[BDEVNAME_SIZE];
2062
2063 freshest = NULL;
2064 ITERATE_RDEV(mddev,rdev,tmp)
2065 switch (super_types[mddev->major_version].
2066 load_super(rdev, freshest, mddev->minor_version)) {
2067 case 1:
2068 freshest = rdev;
2069 break;
2070 case 0:
2071 break;
2072 default:
2073 printk( KERN_ERR \
2074 "md: fatal superblock inconsistency in %s"
2075 " -- removing from array\n",
2076 bdevname(rdev->bdev,b));
2077 kick_rdev_from_array(rdev);
2078 }
2079
2080
2081 super_types[mddev->major_version].
2082 validate_super(mddev, freshest);
2083
2084 i = 0;
2085 ITERATE_RDEV(mddev,rdev,tmp) {
2086 if (rdev != freshest)
2087 if (super_types[mddev->major_version].
2088 validate_super(mddev, rdev)) {
2089 printk(KERN_WARNING "md: kicking non-fresh %s"
2090 " from array!\n",
2091 bdevname(rdev->bdev,b));
2092 kick_rdev_from_array(rdev);
2093 continue;
2094 }
2095 if (mddev->level == LEVEL_MULTIPATH) {
2096 rdev->desc_nr = i++;
2097 rdev->raid_disk = rdev->desc_nr;
b2d444d7 2098 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 2099 }
2100 }
2101
2102
2103
2104 if (mddev->recovery_cp != MaxSector &&
2105 mddev->level >= 1)
2106 printk(KERN_ERR "md: %s: raid array is not clean"
2107 " -- starting background reconstruction\n",
2108 mdname(mddev));
2109
1da177e4
LT		 2110}
2111
16f17b39
N		 2112static ssize_t
2113safe_delay_show(mddev_t *mddev, char *page)
2114{
2115 int msec = (mddev->safemode_delay*1000)/HZ;
2116 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2117}
2118static ssize_t
2119safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2120{
2121 int scale=1;
2122 int dot=0;
2123 int i;
2124 unsigned long msec;
2125 char buf[30];
2126 char *e;
2127 /* remove a period, and count digits after it */
2128 if (len >= sizeof(buf))
2129 return -EINVAL;
2130 strlcpy(buf, cbuf, len);
2131 buf[len] = 0;
2132 for (i=0; i<len; i++) {
2133 if (dot) {
2134 if (isdigit(buf[i])) {
2135 buf[i-1] = buf[i];
2136 scale *= 10;
2137 }
2138 buf[i] = 0;
2139 } else if (buf[i] == '.') {
2140 dot=1;
2141 buf[i] = 0;
2142 }
2143 }
2144 msec = simple_strtoul(buf, &e, 10);
2145 if (e == buf || (*e && *e != '\n'))
2146 return -EINVAL;
2147 msec = (msec * 1000) / scale;
2148 if (msec == 0)
2149 mddev->safemode_delay = 0;
2150 else {
2151 mddev->safemode_delay = (msec*HZ)/1000;
2152 if (mddev->safemode_delay == 0)
2153 mddev->safemode_delay = 1;
2154 }
2155 return len;
2156}
2157static struct md_sysfs_entry md_safe_delay =
80ca3a44 2158__ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
16f17b39 2159
eae1701f 2160static ssize_t
96de1e66 2161level_show(mddev_t *mddev, char *page)
eae1701f 2162{
2604b703 2163 struct mdk_personality *p = mddev->pers;
d9d166c2 2164 if (p)
eae1701f 2165 return sprintf(page, "%s\n", p->name);
d9d166c2
N		 2166 else if (mddev->clevel[0])
2167 return sprintf(page, "%s\n", mddev->clevel);
2168 else if (mddev->level != LEVEL_NONE)
2169 return sprintf(page, "%d\n", mddev->level);
2170 else
2171 return 0;
eae1701f
N		 2172}
2173
d9d166c2
N		 2174static ssize_t
2175level_store(mddev_t *mddev, const char *buf, size_t len)
2176{
2177 int rv = len;
2178 if (mddev->pers)
2179 return -EBUSY;
2180 if (len == 0)
2181 return 0;
2182 if (len >= sizeof(mddev->clevel))
2183 return -ENOSPC;
2184 strncpy(mddev->clevel, buf, len);
2185 if (mddev->clevel[len-1] == '\n')
2186 len--;
2187 mddev->clevel[len] = 0;
2188 mddev->level = LEVEL_NONE;
2189 return rv;
2190}
2191
2192static struct md_sysfs_entry md_level =
80ca3a44 2193__ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
eae1701f 2194
d4dbd025
N		 2195
2196static ssize_t
2197layout_show(mddev_t *mddev, char *page)
2198{
2199 /* just a number, not meaningful for all levels */
2200 return sprintf(page, "%d\n", mddev->layout);
2201}
2202
2203static ssize_t
2204layout_store(mddev_t *mddev, const char *buf, size_t len)
2205{
2206 char *e;
2207 unsigned long n = simple_strtoul(buf, &e, 10);
2208 if (mddev->pers)
2209 return -EBUSY;
2210
2211 if (!*buf || (*e && *e != '\n'))
2212 return -EINVAL;
2213
2214 mddev->layout = n;
2215 return len;
2216}
2217static struct md_sysfs_entry md_layout =
80ca3a44 2218__ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
d4dbd025
N		 2219
2220
eae1701f 2221static ssize_t
96de1e66 2222raid_disks_show(mddev_t *mddev, char *page)
eae1701f 2223{
bb636547
N		 2224 if (mddev->raid_disks == 0)
2225 return 0;
eae1701f
N		 2226 return sprintf(page, "%d\n", mddev->raid_disks);
2227}
2228
da943b99
N		 2229static int update_raid_disks(mddev_t *mddev, int raid_disks);
2230
2231static ssize_t
2232raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2233{
2234 /* can only set raid_disks if array is not yet active */
2235 char *e;
2236 int rv = 0;
2237 unsigned long n = simple_strtoul(buf, &e, 10);
2238
2239 if (!*buf || (*e && *e != '\n'))
2240 return -EINVAL;
2241
2242 if (mddev->pers)
2243 rv = update_raid_disks(mddev, n);
2244 else
2245 mddev->raid_disks = n;
2246 return rv ? rv : len;
2247}
2248static struct md_sysfs_entry md_raid_disks =
80ca3a44 2249__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
eae1701f 2250
3b34380a
N		 2251static ssize_t
2252chunk_size_show(mddev_t *mddev, char *page)
2253{
2254 return sprintf(page, "%d\n", mddev->chunk_size);
2255}
2256
2257static ssize_t
2258chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2259{
2260 /* can only set chunk_size if array is not yet active */
2261 char *e;
2262 unsigned long n = simple_strtoul(buf, &e, 10);
2263
2264 if (mddev->pers)
2265 return -EBUSY;
2266 if (!*buf || (*e && *e != '\n'))
2267 return -EINVAL;
2268
2269 mddev->chunk_size = n;
2270 return len;
2271}
2272static struct md_sysfs_entry md_chunk_size =
80ca3a44 2273__ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3b34380a 2274
a94213b1
N		 2275static ssize_t
2276resync_start_show(mddev_t *mddev, char *page)
2277{
2278 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2279}
2280
2281static ssize_t
2282resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2283{
2284 /* can only set chunk_size if array is not yet active */
2285 char *e;
2286 unsigned long long n = simple_strtoull(buf, &e, 10);
2287
2288 if (mddev->pers)
2289 return -EBUSY;
2290 if (!*buf || (*e && *e != '\n'))
2291 return -EINVAL;
2292
2293 mddev->recovery_cp = n;
2294 return len;
2295}
2296static struct md_sysfs_entry md_resync_start =
80ca3a44 2297__ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
a94213b1 2298
9e653b63
N		 2299/*
2300 * The array state can be:
2301 *
2302 * clear
2303 * No devices, no size, no level
2304 * Equivalent to STOP_ARRAY ioctl
2305 * inactive
2306 * May have some settings, but array is not active
2307 * all IO results in error
2308 * When written, doesn't tear down array, but just stops it
2309 * suspended (not supported yet)
2310 * All IO requests will block. The array can be reconfigured.
2311 * Writing this, if accepted, will block until array is quiessent
2312 * readonly
2313 * no resync can happen. no superblocks get written.
2314 * write requests fail
2315 * read-auto
2316 * like readonly, but behaves like 'clean' on a write request.
2317 *
2318 * clean - no pending writes, but otherwise active.
2319 * When written to inactive array, starts without resync
2320 * If a write request arrives then
2321 * if metadata is known, mark 'dirty' and switch to 'active'.
2322 * if not known, block and switch to write-pending
2323 * If written to an active array that has pending writes, then fails.
2324 * active
2325 * fully active: IO and resync can be happening.
2326 * When written to inactive array, starts with resync
2327 *
2328 * write-pending
2329 * clean, but writes are blocked waiting for 'active' to be written.
2330 *
2331 * active-idle
2332 * like active, but no writes have been seen for a while (100msec).
2333 *
2334 */
2335enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2336 write_pending, active_idle, bad_word};
05381954 2337static char *array_states[] = {
9e653b63
N		 2338 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2339 "write-pending", "active-idle", NULL };
2340
2341static int match_word(const char *word, char **list)
2342{
2343 int n;
2344 for (n=0; list[n]; n++)
2345 if (cmd_match(word, list[n]))
2346 break;
2347 return n;
2348}
2349
2350static ssize_t
2351array_state_show(mddev_t *mddev, char *page)
2352{
2353 enum array_state st = inactive;
2354
2355 if (mddev->pers)
2356 switch(mddev->ro) {
2357 case 1:
2358 st = readonly;
2359 break;
2360 case 2:
2361 st = read_auto;
2362 break;
2363 case 0:
2364 if (mddev->in_sync)
2365 st = clean;
2366 else if (mddev->safemode)
2367 st = active_idle;
2368 else
2369 st = active;
2370 }
2371 else {
2372 if (list_empty(&mddev->disks) &&
2373 mddev->raid_disks == 0 &&
2374 mddev->size == 0)
2375 st = clear;
2376 else
2377 st = inactive;
2378 }
2379 return sprintf(page, "%s\n", array_states[st]);
2380}
2381
2382static int do_md_stop(mddev_t * mddev, int ro);
2383static int do_md_run(mddev_t * mddev);
2384static int restart_array(mddev_t *mddev);
2385
2386static ssize_t
2387array_state_store(mddev_t *mddev, const char *buf, size_t len)
2388{
2389 int err = -EINVAL;
2390 enum array_state st = match_word(buf, array_states);
2391 switch(st) {
2392 case bad_word:
2393 break;
2394 case clear:
2395 /* stopping an active array */
2396 if (mddev->pers) {
2397 if (atomic_read(&mddev->active) > 1)
2398 return -EBUSY;
2399 err = do_md_stop(mddev, 0);
2400 }
2401 break;
2402 case inactive:
2403 /* stopping an active array */
2404 if (mddev->pers) {
2405 if (atomic_read(&mddev->active) > 1)
2406 return -EBUSY;
2407 err = do_md_stop(mddev, 2);
2408 }
2409 break;
2410 case suspended:
2411 break; /* not supported yet */
2412 case readonly:
2413 if (mddev->pers)
2414 err = do_md_stop(mddev, 1);
2415 else {
2416 mddev->ro = 1;
2417 err = do_md_run(mddev);
2418 }
2419 break;
2420 case read_auto:
2421 /* stopping an active array */
2422 if (mddev->pers) {
2423 err = do_md_stop(mddev, 1);
2424 if (err == 0)
2425 mddev->ro = 2; /* FIXME mark devices writable */
2426 } else {
2427 mddev->ro = 2;
2428 err = do_md_run(mddev);
2429 }
2430 break;
2431 case clean:
2432 if (mddev->pers) {
2433 restart_array(mddev);
2434 spin_lock_irq(&mddev->write_lock);
2435 if (atomic_read(&mddev->writes_pending) == 0) {
2436 mddev->in_sync = 1;
850b2b42 2437 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
9e653b63
N		 2438 }
2439 spin_unlock_irq(&mddev->write_lock);
2440 } else {
2441 mddev->ro = 0;
2442 mddev->recovery_cp = MaxSector;
2443 err = do_md_run(mddev);
2444 }
2445 break;
2446 case active:
2447 if (mddev->pers) {
2448 restart_array(mddev);
850b2b42 2449 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
9e653b63
N		 2450 wake_up(&mddev->sb_wait);
2451 err = 0;
2452 } else {
2453 mddev->ro = 0;
2454 err = do_md_run(mddev);
2455 }
2456 break;
2457 case write_pending:
2458 case active_idle:
2459 /* these cannot be set */
2460 break;
2461 }
2462 if (err)
2463 return err;
2464 else
2465 return len;
2466}
80ca3a44
N		 2467static struct md_sysfs_entry md_array_state =
2468__ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
9e653b63 2469
6d7ff738
N		 2470static ssize_t
2471null_show(mddev_t *mddev, char *page)
2472{
2473 return -EINVAL;
2474}
2475
2476static ssize_t
2477new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2478{
2479 /* buf must be %d:%d\n? giving major and minor numbers */
2480 /* The new device is added to the array.
2481 * If the array has a persistent superblock, we read the
2482 * superblock to initialise info and check validity.
2483 * Otherwise, only checking done is that in bind_rdev_to_array,
2484 * which mainly checks size.
2485 */
2486 char *e;
2487 int major = simple_strtoul(buf, &e, 10);
2488 int minor;
2489 dev_t dev;
2490 mdk_rdev_t *rdev;
2491 int err;
2492
2493 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2494 return -EINVAL;
2495 minor = simple_strtoul(e+1, &e, 10);
2496 if (*e && *e != '\n')
2497 return -EINVAL;
2498 dev = MKDEV(major, minor);
2499 if (major != MAJOR(dev) ||
2500 minor != MINOR(dev))
2501 return -EOVERFLOW;
2502
2503
2504 if (mddev->persistent) {
2505 rdev = md_import_device(dev, mddev->major_version,
2506 mddev->minor_version);
2507 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2508 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2509 mdk_rdev_t, same_set);
2510 err = super_types[mddev->major_version]
2511 .load_super(rdev, rdev0, mddev->minor_version);
2512 if (err < 0)
2513 goto out;
2514 }
2515 } else
2516 rdev = md_import_device(dev, -1, -1);
2517
2518 if (IS_ERR(rdev))
2519 return PTR_ERR(rdev);
2520 err = bind_rdev_to_array(rdev, mddev);
2521 out:
2522 if (err)
2523 export_rdev(rdev);
2524 return err ? err : len;
2525}
2526
2527static struct md_sysfs_entry md_new_device =
80ca3a44 2528__ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3b34380a 2529
9b1d1dac
PC		 2530static ssize_t
2531bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2532{
2533 char *end;
2534 unsigned long chunk, end_chunk;
2535
2536 if (!mddev->bitmap)
2537 goto out;
2538 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2539 while (*buf) {
2540 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2541 if (buf == end) break;
2542 if (*end == '-') { /* range */
2543 buf = end + 1;
2544 end_chunk = simple_strtoul(buf, &end, 0);
2545 if (buf == end) break;
2546 }
2547 if (*end && !isspace(*end)) break;
2548 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2549 buf = end;
2550 while (isspace(*buf)) buf++;
2551 }
2552 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2553out:
2554 return len;
2555}
2556
2557static struct md_sysfs_entry md_bitmap =
2558__ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2559
a35b0d69
N		 2560static ssize_t
2561size_show(mddev_t *mddev, char *page)
2562{
2563 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2564}
2565
2566static int update_size(mddev_t *mddev, unsigned long size);
2567
2568static ssize_t
2569size_store(mddev_t *mddev, const char *buf, size_t len)
2570{
2571 /* If array is inactive, we can reduce the component size, but
2572 * not increase it (except from 0).
2573 * If array is active, we can try an on-line resize
2574 */
2575 char *e;
2576 int err = 0;
2577 unsigned long long size = simple_strtoull(buf, &e, 10);
2578 if (!*buf || *buf == '\n' ||
2579 (*e && *e != '\n'))
2580 return -EINVAL;
2581
2582 if (mddev->pers) {
2583 err = update_size(mddev, size);
850b2b42 2584 md_update_sb(mddev, 1);
a35b0d69
N		 2585 } else {
2586 if (mddev->size == 0 ||
2587 mddev->size > size)
2588 mddev->size = size;
2589 else
2590 err = -ENOSPC;
2591 }
2592 return err ? err : len;
2593}
2594
2595static struct md_sysfs_entry md_size =
80ca3a44 2596__ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
a35b0d69 2597
8bb93aac
N		 2598
2599/* Metdata version.
2600 * This is either 'none' for arrays with externally managed metadata,
2601 * or N.M for internally known formats
2602 */
2603static ssize_t
2604metadata_show(mddev_t *mddev, char *page)
2605{
2606 if (mddev->persistent)
2607 return sprintf(page, "%d.%d\n",
2608 mddev->major_version, mddev->minor_version);
2609 else
2610 return sprintf(page, "none\n");
2611}
2612
2613static ssize_t
2614metadata_store(mddev_t *mddev, const char *buf, size_t len)
2615{
2616 int major, minor;
2617 char *e;
2618 if (!list_empty(&mddev->disks))
2619 return -EBUSY;
2620
2621 if (cmd_match(buf, "none")) {
2622 mddev->persistent = 0;
2623 mddev->major_version = 0;
2624 mddev->minor_version = 90;
2625 return len;
2626 }
2627 major = simple_strtoul(buf, &e, 10);
2628 if (e==buf || *e != '.')
2629 return -EINVAL;
2630 buf = e+1;
2631 minor = simple_strtoul(buf, &e, 10);
2632 if (e==buf || *e != '\n')
2633 return -EINVAL;
2634 if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
2635 super_types[major].name == NULL)
2636 return -ENOENT;
2637 mddev->major_version = major;
2638 mddev->minor_version = minor;
2639 mddev->persistent = 1;
2640 return len;
2641}
2642
2643static struct md_sysfs_entry md_metadata =
80ca3a44 2644__ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
8bb93aac 2645
24dd469d 2646static ssize_t
7eec314d 2647action_show(mddev_t *mddev, char *page)
24dd469d 2648{
7eec314d 2649 char *type = "idle";
31399d9e
N		 2650 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2651 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
ccfcc3c1
N		 2652 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2653 type = "reshape";
2654 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N		 2655 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2656 type = "resync";
2657 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2658 type = "check";
2659 else
2660 type = "repair";
2661 } else
2662 type = "recover";
2663 }
2664 return sprintf(page, "%s\n", type);
2665}
2666
2667static ssize_t
7eec314d 2668action_store(mddev_t *mddev, const char *page, size_t len)
24dd469d 2669{
7eec314d
N		 2670 if (!mddev->pers || !mddev->pers->sync_request)
2671 return -EINVAL;
2672
bce74dac 2673 if (cmd_match(page, "idle")) {
7eec314d
N		 2674 if (mddev->sync_thread) {
2675 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2676 md_unregister_thread(mddev->sync_thread);
2677 mddev->sync_thread = NULL;
2678 mddev->recovery = 0;
2679 }
03c902e1
N		 2680 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2681 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 2682 return -EBUSY;
03c902e1 2683 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
7eec314d 2684 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
16484bf5
N		 2685 else if (cmd_match(page, "reshape")) {
2686 int err;
2687 if (mddev->pers->start_reshape == NULL)
2688 return -EINVAL;
2689 err = mddev->pers->start_reshape(mddev);
2690 if (err)
2691 return err;
2692 } else {
bce74dac 2693 if (cmd_match(page, "check"))
7eec314d 2694 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2adc7d47 2695 else if (!cmd_match(page, "repair"))
7eec314d
N		 2696 return -EINVAL;
2697 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2698 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7eec314d 2699 }
03c902e1 2700 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d
N		 2701 md_wakeup_thread(mddev->thread);
2702 return len;
2703}
2704
9d88883e 2705static ssize_t
96de1e66 2706mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 2707{
2708 return sprintf(page, "%llu\n",
2709 (unsigned long long) mddev->resync_mismatches);
2710}
2711
80ca3a44
N		 2712static struct md_sysfs_entry md_scan_mode =
2713__ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 2714
96de1e66 2715
80ca3a44 2716static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 2717
88202a0c
N		 2718static ssize_t
2719sync_min_show(mddev_t *mddev, char *page)
2720{
2721 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2722 mddev->sync_speed_min ? "local": "system");
2723}
2724
2725static ssize_t
2726sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2727{
2728 int min;
2729 char *e;
2730 if (strncmp(buf, "system", 6)==0) {
2731 mddev->sync_speed_min = 0;
2732 return len;
2733 }
2734 min = simple_strtoul(buf, &e, 10);
2735 if (buf == e || (*e && *e != '\n') || min <= 0)
2736 return -EINVAL;
2737 mddev->sync_speed_min = min;
2738 return len;
2739}
2740
2741static struct md_sysfs_entry md_sync_min =
2742__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2743
2744static ssize_t
2745sync_max_show(mddev_t *mddev, char *page)
2746{
2747 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2748 mddev->sync_speed_max ? "local": "system");
2749}
2750
2751static ssize_t
2752sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2753{
2754 int max;
2755 char *e;
2756 if (strncmp(buf, "system", 6)==0) {
2757 mddev->sync_speed_max = 0;
2758 return len;
2759 }
2760 max = simple_strtoul(buf, &e, 10);
2761 if (buf == e || (*e && *e != '\n') || max <= 0)
2762 return -EINVAL;
2763 mddev->sync_speed_max = max;
2764 return len;
2765}
2766
2767static struct md_sysfs_entry md_sync_max =
2768__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2769
2770
2771static ssize_t
2772sync_speed_show(mddev_t *mddev, char *page)
2773{
2774 unsigned long resync, dt, db;
ff4e8d9a 2775 resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active));
88202a0c
N		 2776 dt = ((jiffies - mddev->resync_mark) / HZ);
2777 if (!dt) dt++;
2778 db = resync - (mddev->resync_mark_cnt);
2779 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2780}
2781
80ca3a44 2782static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
88202a0c
N		 2783
2784static ssize_t
2785sync_completed_show(mddev_t *mddev, char *page)
2786{
2787 unsigned long max_blocks, resync;
2788
2789 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2790 max_blocks = mddev->resync_max_sectors;
2791 else
2792 max_blocks = mddev->size << 1;
2793
2794 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2795 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2796}
2797
80ca3a44 2798static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
88202a0c 2799
e464eafd
N		 2800static ssize_t
2801suspend_lo_show(mddev_t *mddev, char *page)
2802{
2803 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
2804}
2805
2806static ssize_t
2807suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
2808{
2809 char *e;
2810 unsigned long long new = simple_strtoull(buf, &e, 10);
2811
2812 if (mddev->pers->quiesce == NULL)
2813 return -EINVAL;
2814 if (buf == e || (*e && *e != '\n'))
2815 return -EINVAL;
2816 if (new >= mddev->suspend_hi ||
2817 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
2818 mddev->suspend_lo = new;
2819 mddev->pers->quiesce(mddev, 2);
2820 return len;
2821 } else
2822 return -EINVAL;
2823}
2824static struct md_sysfs_entry md_suspend_lo =
2825__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
2826
2827
2828static ssize_t
2829suspend_hi_show(mddev_t *mddev, char *page)
2830{
2831 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
2832}
2833
2834static ssize_t
2835suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
2836{
2837 char *e;
2838 unsigned long long new = simple_strtoull(buf, &e, 10);
2839
2840 if (mddev->pers->quiesce == NULL)
2841 return -EINVAL;
2842 if (buf == e || (*e && *e != '\n'))
2843 return -EINVAL;
2844 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
2845 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
2846 mddev->suspend_hi = new;
2847 mddev->pers->quiesce(mddev, 1);
2848 mddev->pers->quiesce(mddev, 0);
2849 return len;
2850 } else
2851 return -EINVAL;
2852}
2853static struct md_sysfs_entry md_suspend_hi =
2854__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
2855
2856
eae1701f
N		 2857static struct attribute *md_default_attrs[] = {
2858 &md_level.attr,
d4dbd025 2859 &md_layout.attr,
eae1701f 2860 &md_raid_disks.attr,
3b34380a 2861 &md_chunk_size.attr,
a35b0d69 2862 &md_size.attr,
a94213b1 2863 &md_resync_start.attr,
8bb93aac 2864 &md_metadata.attr,
6d7ff738 2865 &md_new_device.attr,
16f17b39 2866 &md_safe_delay.attr,
9e653b63 2867 &md_array_state.attr,
411036fa
N		 2868 NULL,
2869};
2870
2871static struct attribute *md_redundancy_attrs[] = {
24dd469d 2872 &md_scan_mode.attr,
9d88883e 2873 &md_mismatches.attr,
88202a0c
N		 2874 &md_sync_min.attr,
2875 &md_sync_max.attr,
2876 &md_sync_speed.attr,
2877 &md_sync_completed.attr,
e464eafd
N		 2878 &md_suspend_lo.attr,
2879 &md_suspend_hi.attr,
9b1d1dac 2880 &md_bitmap.attr,
eae1701f
N		 2881 NULL,
2882};
411036fa
N		 2883static struct attribute_group md_redundancy_group = {
2884 .name = NULL,
2885 .attrs = md_redundancy_attrs,
2886};
2887
eae1701f
N		 2888
2889static ssize_t
2890md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2891{
2892 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2893 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2894 ssize_t rv;
eae1701f
N		 2895
2896 if (!entry->show)
2897 return -EIO;
5dc5cf7d
IM		 2898 rv = mddev_lock(mddev);
2899 if (!rv) {
2900 rv = entry->show(mddev, page);
2901 mddev_unlock(mddev);
2902 }
96de1e66 2903 return rv;
eae1701f
N		 2904}
2905
2906static ssize_t
2907md_attr_store(struct kobject *kobj, struct attribute *attr,
2908 const char *page, size_t length)
2909{
2910 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2911 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2912 ssize_t rv;
eae1701f
N		 2913
2914 if (!entry->store)
2915 return -EIO;
67463acb
N		 2916 if (!capable(CAP_SYS_ADMIN))
2917 return -EACCES;
5dc5cf7d
IM		 2918 rv = mddev_lock(mddev);
2919 if (!rv) {
2920 rv = entry->store(mddev, page, length);
2921 mddev_unlock(mddev);
2922 }
96de1e66 2923 return rv;
eae1701f
N		 2924}
2925
2926static void md_free(struct kobject *ko)
2927{
2928 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2929 kfree(mddev);
2930}
2931
2932static struct sysfs_ops md_sysfs_ops = {
2933 .show = md_attr_show,
2934 .store = md_attr_store,
2935};
2936static struct kobj_type md_ktype = {
2937 .release = md_free,
2938 .sysfs_ops = &md_sysfs_ops,
2939 .default_attrs = md_default_attrs,
2940};
2941
1da177e4
LT		 2942int mdp_major = 0;
2943
2944static struct kobject *md_probe(dev_t dev, int *part, void *data)
2945{
48c9c27b 2946 static DEFINE_MUTEX(disks_mutex);
1da177e4
LT		 2947 mddev_t *mddev = mddev_find(dev);
2948 struct gendisk *disk;
2949 int partitioned = (MAJOR(dev) != MD_MAJOR);
2950 int shift = partitioned ? MdpMinorShift : 0;
2951 int unit = MINOR(dev) >> shift;
2952
2953 if (!mddev)
2954 return NULL;
2955
48c9c27b 2956 mutex_lock(&disks_mutex);
1da177e4 2957 if (mddev->gendisk) {
48c9c27b 2958 mutex_unlock(&disks_mutex);
1da177e4
LT		 2959 mddev_put(mddev);
2960 return NULL;
2961 }
2962 disk = alloc_disk(1 << shift);
2963 if (!disk) {
48c9c27b 2964 mutex_unlock(&disks_mutex);
1da177e4
LT		 2965 mddev_put(mddev);
2966 return NULL;
2967 }
2968 disk->major = MAJOR(dev);
2969 disk->first_minor = unit << shift;
ce7b0f46 2970 if (partitioned)
1da177e4 2971 sprintf(disk->disk_name, "md_d%d", unit);
ce7b0f46 2972 else
1da177e4 2973 sprintf(disk->disk_name, "md%d", unit);
1da177e4
LT		 2974 disk->fops = &md_fops;
2975 disk->private_data = mddev;
2976 disk->queue = mddev->queue;
2977 add_disk(disk);
2978 mddev->gendisk = disk;
48c9c27b 2979 mutex_unlock(&disks_mutex);
9c791977 2980 mddev->kobj.parent = &disk->kobj;
eae1701f
N		 2981 mddev->kobj.k_name = NULL;
2982 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
2983 mddev->kobj.ktype = &md_ktype;
2984 kobject_register(&mddev->kobj);
1da177e4
LT		 2985 return NULL;
2986}
2987
1da177e4
LT		 2988static void md_safemode_timeout(unsigned long data)
2989{
2990 mddev_t *mddev = (mddev_t *) data;
2991
2992 mddev->safemode = 1;
2993 md_wakeup_thread(mddev->thread);
2994}
2995
6ff8d8ec 2996static int start_dirty_degraded;
1da177e4
LT		 2997
2998static int do_md_run(mddev_t * mddev)
2999{
2604b703 3000 int err;
1da177e4
LT		 3001 int chunk_size;
3002 struct list_head *tmp;
3003 mdk_rdev_t *rdev;
3004 struct gendisk *disk;
2604b703 3005 struct mdk_personality *pers;
1da177e4
LT		 3006 char b[BDEVNAME_SIZE];
3007
a757e64c
N		 3008 if (list_empty(&mddev->disks))
3009 /* cannot run an array with no devices.. */
1da177e4 3010 return -EINVAL;
1da177e4
LT		 3011
3012 if (mddev->pers)
3013 return -EBUSY;
3014
3015 /*
3016 * Analyze all RAID superblock(s)
3017 */
a757e64c
N		 3018 if (!mddev->raid_disks)
3019 analyze_sbs(mddev);
1da177e4
LT		 3020
3021 chunk_size = mddev->chunk_size;
2604b703
N		 3022
3023 if (chunk_size) {
1da177e4
LT		 3024 if (chunk_size > MAX_CHUNK_SIZE) {
3025 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3026 chunk_size, MAX_CHUNK_SIZE);
3027 return -EINVAL;
3028 }
3029 /*
3030 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3031 */
3032 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 3033 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 3034 return -EINVAL;
3035 }
3036 if (chunk_size < PAGE_SIZE) {
3037 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
3038 chunk_size, PAGE_SIZE);
3039 return -EINVAL;
3040 }
3041
3042 /* devices must have minimum size of one chunk */
3043 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 3044 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3045 continue;
3046 if (rdev->size < chunk_size / 1024) {
3047 printk(KERN_WARNING
3048 "md: Dev %s smaller than chunk_size:"
3049 " %lluk < %dk\n",
3050 bdevname(rdev->bdev,b),
3051 (unsigned long long)rdev->size,
3052 chunk_size / 1024);
3053 return -EINVAL;
3054 }
3055 }
3056 }
3057
1da177e4 3058#ifdef CONFIG_KMOD
d9d166c2
N		 3059 if (mddev->level != LEVEL_NONE)
3060 request_module("md-level-%d", mddev->level);
3061 else if (mddev->clevel[0])
3062 request_module("md-%s", mddev->clevel);
1da177e4
LT		 3063#endif
3064
3065 /*
3066 * Drop all container device buffers, from now on
3067 * the only valid external interface is through the md
3068 * device.
3069 * Also find largest hardsector size
3070 */
3071 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 3072 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3073 continue;
3074 sync_blockdev(rdev->bdev);
3075 invalidate_bdev(rdev->bdev, 0);
3076 }
3077
3078 md_probe(mddev->unit, NULL, NULL);
3079 disk = mddev->gendisk;
3080 if (!disk)
3081 return -ENOMEM;
3082
3083 spin_lock(&pers_lock);
d9d166c2 3084 pers = find_pers(mddev->level, mddev->clevel);
2604b703 3085 if (!pers || !try_module_get(pers->owner)) {
1da177e4 3086 spin_unlock(&pers_lock);
d9d166c2
N		 3087 if (mddev->level != LEVEL_NONE)
3088 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3089 mddev->level);
3090 else
3091 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3092 mddev->clevel);
1da177e4
LT		 3093 return -EINVAL;
3094 }
2604b703 3095 mddev->pers = pers;
1da177e4 3096 spin_unlock(&pers_lock);
d9d166c2
N		 3097 mddev->level = pers->level;
3098 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
1da177e4 3099
f6705578 3100 if (mddev->reshape_position != MaxSector &&
63c70c4f 3101 pers->start_reshape == NULL) {
f6705578
N		 3102 /* This personality cannot handle reshaping... */
3103 mddev->pers = NULL;
3104 module_put(pers->owner);
3105 return -EINVAL;
3106 }
3107
657390d2 3108 mddev->recovery = 0;
1da177e4 3109 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 3110 mddev->barriers_work = 1;
6ff8d8ec 3111 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 3112
f91de92e
N		 3113 if (start_readonly)
3114 mddev->ro = 2; /* read-only, but switch on first write */
3115
b15c2e57
N		 3116 err = mddev->pers->run(mddev);
3117 if (!err && mddev->pers->sync_request) {
3118 err = bitmap_create(mddev);
3119 if (err) {
3120 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3121 mdname(mddev), err);
3122 mddev->pers->stop(mddev);
3123 }
3124 }
1da177e4
LT		 3125 if (err) {
3126 printk(KERN_ERR "md: pers->run() failed ...\n");
3127 module_put(mddev->pers->owner);
3128 mddev->pers = NULL;
32a7627c
N		 3129 bitmap_destroy(mddev);
3130 return err;
1da177e4 3131 }
411036fa
N		 3132 if (mddev->pers->sync_request)
3133 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
fd9d49ca
N		 3134 else if (mddev->ro == 2) /* auto-readonly not meaningful */
3135 mddev->ro = 0;
3136
1da177e4
LT		 3137 atomic_set(&mddev->writes_pending,0);
3138 mddev->safemode = 0;
3139 mddev->safemode_timer.function = md_safemode_timeout;
3140 mddev->safemode_timer.data = (unsigned long) mddev;
16f17b39 3141 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
1da177e4 3142 mddev->in_sync = 1;
86e6ffdd
N		 3143
3144 ITERATE_RDEV(mddev,rdev,tmp)
3145 if (rdev->raid_disk >= 0) {
3146 char nm[20];
3147 sprintf(nm, "rd%d", rdev->raid_disk);
3148 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
3149 }
1da177e4
LT		 3150
3151 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3152
850b2b42
N		 3153 if (mddev->flags)
3154 md_update_sb(mddev, 0);
1da177e4
LT		 3155
3156 set_capacity(disk, mddev->array_size<<1);
3157
3158 /* If we call blk_queue_make_request here, it will
3159 * re-initialise max_sectors etc which may have been
3160 * refined inside -> run. So just set the bits we need to set.
3161 * Most initialisation happended when we called
3162 * blk_queue_make_request(..., md_fail_request)
3163 * earlier.
3164 */
3165 mddev->queue->queuedata = mddev;
3166 mddev->queue->make_request_fn = mddev->pers->make_request;
3167
5fd6c1dc
N		 3168 /* If there is a partially-recovered drive we need to
3169 * start recovery here. If we leave it to md_check_recovery,
3170 * it will remove the drives and not do the right thing
3171 */
0b8c9de0 3172 if (mddev->degraded && !mddev->sync_thread) {
5fd6c1dc
N		 3173 struct list_head *rtmp;
3174 int spares = 0;
3175 ITERATE_RDEV(mddev,rdev,rtmp)
3176 if (rdev->raid_disk >= 0 &&
3177 !test_bit(In_sync, &rdev->flags) &&
3178 !test_bit(Faulty, &rdev->flags))
3179 /* complete an interrupted recovery */
3180 spares++;
3181 if (spares && mddev->pers->sync_request) {
3182 mddev->recovery = 0;
3183 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3184 mddev->sync_thread = md_register_thread(md_do_sync,
3185 mddev,
3186 "%s_resync");
3187 if (!mddev->sync_thread) {
3188 printk(KERN_ERR "%s: could not start resync"
3189 " thread...\n",
3190 mdname(mddev));
3191 /* leave the spares where they are, it shouldn't hurt */
3192 mddev->recovery = 0;
0b8c9de0 3193 }
5fd6c1dc
N		 3194 }
3195 }
0b8c9de0
N		 3196 md_wakeup_thread(mddev->thread);
3197 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5fd6c1dc 3198
1da177e4 3199 mddev->changed = 1;
d7603b7e 3200 md_new_event(mddev);
1da177e4
LT		 3201 return 0;
3202}
3203
3204static int restart_array(mddev_t *mddev)
3205{
3206 struct gendisk *disk = mddev->gendisk;
3207 int err;
3208
3209 /*
3210 * Complain if it has no devices
3211 */
3212 err = -ENXIO;
3213 if (list_empty(&mddev->disks))
3214 goto out;
3215
3216 if (mddev->pers) {
3217 err = -EBUSY;
3218 if (!mddev->ro)
3219 goto out;
3220
3221 mddev->safemode = 0;
3222 mddev->ro = 0;
3223 set_disk_ro(disk, 0);
3224
3225 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3226 mdname(mddev));
3227 /*
3228 * Kick recovery or resync if necessary
3229 */
3230 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3231 md_wakeup_thread(mddev->thread);
5fd6c1dc 3232 md_wakeup_thread(mddev->sync_thread);
1da177e4 3233 err = 0;
9e653b63 3234 } else
1da177e4 3235 err = -EINVAL;
1da177e4
LT		 3236
3237out:
3238 return err;
3239}
3240
acc55e22
N		 3241/* similar to deny_write_access, but accounts for our holding a reference
3242 * to the file ourselves */
3243static int deny_bitmap_write_access(struct file * file)
3244{
3245 struct inode *inode = file->f_mapping->host;
3246
3247 spin_lock(&inode->i_lock);
3248 if (atomic_read(&inode->i_writecount) > 1) {
3249 spin_unlock(&inode->i_lock);
3250 return -ETXTBSY;
3251 }
3252 atomic_set(&inode->i_writecount, -1);
3253 spin_unlock(&inode->i_lock);
3254
3255 return 0;
3256}
3257
3258static void restore_bitmap_write_access(struct file *file)
3259{
3260 struct inode *inode = file->f_mapping->host;
3261
3262 spin_lock(&inode->i_lock);
3263 atomic_set(&inode->i_writecount, 1);
3264 spin_unlock(&inode->i_lock);
3265}
3266
9e653b63
N		 3267/* mode:
3268 * 0 - completely stop and dis-assemble array
3269 * 1 - switch to readonly
3270 * 2 - stop but do not disassemble array
3271 */
3272static int do_md_stop(mddev_t * mddev, int mode)
1da177e4
LT		 3273{
3274 int err = 0;
3275 struct gendisk *disk = mddev->gendisk;
3276
3277 if (mddev->pers) {
3278 if (atomic_read(&mddev->active)>2) {
3279 printk("md: %s still in use.\n",mdname(mddev));
3280 return -EBUSY;
3281 }
3282
3283 if (mddev->sync_thread) {
5fd6c1dc 3284 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4
LT		 3285 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3286 md_unregister_thread(mddev->sync_thread);
3287 mddev->sync_thread = NULL;
3288 }
3289
3290 del_timer_sync(&mddev->safemode_timer);
3291
3292 invalidate_partition(disk, 0);
3293
9e653b63
N		 3294 switch(mode) {
3295 case 1: /* readonly */
1da177e4 3296 err = -ENXIO;
f91de92e 3297 if (mddev->ro==1)
1da177e4
LT		 3298 goto out;
3299 mddev->ro = 1;
9e653b63
N		 3300 break;
3301 case 0: /* disassemble */
3302 case 2: /* stop */
6b8b3e8a 3303 bitmap_flush(mddev);
a9701a30 3304 md_super_wait(mddev);
1da177e4
LT		 3305 if (mddev->ro)
3306 set_disk_ro(disk, 0);
3307 blk_queue_make_request(mddev->queue, md_fail_request);
3308 mddev->pers->stop(mddev);
411036fa
N		 3309 if (mddev->pers->sync_request)
3310 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3311
1da177e4
LT		 3312 module_put(mddev->pers->owner);
3313 mddev->pers = NULL;
3314 if (mddev->ro)
3315 mddev->ro = 0;
3316 }
850b2b42 3317 if (!mddev->in_sync || mddev->flags) {
1da177e4
LT		 3318 /* mark array as shutdown cleanly */
3319 mddev->in_sync = 1;
850b2b42 3320 md_update_sb(mddev, 1);
1da177e4 3321 }
9e653b63 3322 if (mode == 1)
1da177e4 3323 set_disk_ro(disk, 1);
5fd6c1dc 3324 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4 3325 }
32a7627c 3326
1da177e4
LT		 3327 /*
3328 * Free resources if final stop
3329 */
9e653b63 3330 if (mode == 0) {
86e6ffdd
N		 3331 mdk_rdev_t *rdev;
3332 struct list_head *tmp;
1da177e4
LT		 3333 struct gendisk *disk;
3334 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3335
978f946b
N		 3336 bitmap_destroy(mddev);
3337 if (mddev->bitmap_file) {
acc55e22 3338 restore_bitmap_write_access(mddev->bitmap_file);
978f946b
N		 3339 fput(mddev->bitmap_file);
3340 mddev->bitmap_file = NULL;
3341 }
3342 mddev->bitmap_offset = 0;
3343
86e6ffdd
N		 3344 ITERATE_RDEV(mddev,rdev,tmp)
3345 if (rdev->raid_disk >= 0) {
3346 char nm[20];
3347 sprintf(nm, "rd%d", rdev->raid_disk);
3348 sysfs_remove_link(&mddev->kobj, nm);
3349 }
3350
1da177e4
LT		 3351 export_array(mddev);
3352
3353 mddev->array_size = 0;
9e653b63
N		 3354 mddev->size = 0;
3355 mddev->raid_disks = 0;
a94213b1 3356 mddev->recovery_cp = 0;
9e653b63 3357
1da177e4
LT		 3358 disk = mddev->gendisk;
3359 if (disk)
3360 set_capacity(disk, 0);
3361 mddev->changed = 1;
a8a55c38 3362 } else if (mddev->pers)
1da177e4
LT		 3363 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3364 mdname(mddev));
3365 err = 0;
d7603b7e 3366 md_new_event(mddev);
1da177e4
LT		 3367out:
3368 return err;
3369}
3370
3371static void autorun_array(mddev_t *mddev)
3372{
3373 mdk_rdev_t *rdev;
3374 struct list_head *tmp;
3375 int err;
3376
a757e64c 3377 if (list_empty(&mddev->disks))
1da177e4 3378 return;
1da177e4
LT		 3379
3380 printk(KERN_INFO "md: running: ");
3381
3382 ITERATE_RDEV(mddev,rdev,tmp) {
3383 char b[BDEVNAME_SIZE];
3384 printk("<%s>", bdevname(rdev->bdev,b));
3385 }
3386 printk("\n");
3387
3388 err = do_md_run (mddev);
3389 if (err) {
3390 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3391 do_md_stop (mddev, 0);
3392 }
3393}
3394
3395/*
3396 * lets try to run arrays based on all disks that have arrived
3397 * until now. (those are in pending_raid_disks)
3398 *
3399 * the method: pick the first pending disk, collect all disks with
3400 * the same UUID, remove all from the pending list and put them into
3401 * the 'same_array' list. Then order this list based on superblock
3402 * update time (freshest comes first), kick out 'old' disks and
3403 * compare superblocks. If everything's fine then run it.
3404 *
3405 * If "unit" is allocated, then bump its reference count
3406 */
3407static void autorun_devices(int part)
3408{
1da177e4
LT		 3409 struct list_head *tmp;
3410 mdk_rdev_t *rdev0, *rdev;
3411 mddev_t *mddev;
3412 char b[BDEVNAME_SIZE];
3413
3414 printk(KERN_INFO "md: autorun ...\n");
3415 while (!list_empty(&pending_raid_disks)) {
e8703fe1 3416 int unit;
1da177e4 3417 dev_t dev;
ad01c9e3 3418 LIST_HEAD(candidates);
1da177e4
LT		 3419 rdev0 = list_entry(pending_raid_disks.next,
3420 mdk_rdev_t, same_set);
3421
3422 printk(KERN_INFO "md: considering %s ...\n",
3423 bdevname(rdev0->bdev,b));
3424 INIT_LIST_HEAD(&candidates);
3425 ITERATE_RDEV_PENDING(rdev,tmp)
3426 if (super_90_load(rdev, rdev0, 0) >= 0) {
3427 printk(KERN_INFO "md: adding %s ...\n",
3428 bdevname(rdev->bdev,b));
3429 list_move(&rdev->same_set, &candidates);
3430 }
3431 /*
3432 * now we have a set of devices, with all of them having
3433 * mostly sane superblocks. It's time to allocate the
3434 * mddev.
3435 */
e8703fe1
N		 3436 if (part) {
3437 dev = MKDEV(mdp_major,
3438 rdev0->preferred_minor << MdpMinorShift);
3439 unit = MINOR(dev) >> MdpMinorShift;
3440 } else {
3441 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3442 unit = MINOR(dev);
3443 }
3444 if (rdev0->preferred_minor != unit) {
1da177e4
LT		 3445 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3446 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3447 break;
3448 }
1da177e4
LT		 3449
3450 md_probe(dev, NULL, NULL);
3451 mddev = mddev_find(dev);
3452 if (!mddev) {
3453 printk(KERN_ERR
3454 "md: cannot allocate memory for md drive.\n");
3455 break;
3456 }
3457 if (mddev_lock(mddev))
3458 printk(KERN_WARNING "md: %s locked, cannot run\n",
3459 mdname(mddev));
3460 else if (mddev->raid_disks || mddev->major_version
3461 || !list_empty(&mddev->disks)) {
3462 printk(KERN_WARNING
3463 "md: %s already running, cannot run %s\n",
3464 mdname(mddev), bdevname(rdev0->bdev,b));
3465 mddev_unlock(mddev);
3466 } else {
3467 printk(KERN_INFO "md: created %s\n", mdname(mddev));
3468 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
3469 list_del_init(&rdev->same_set);
3470 if (bind_rdev_to_array(rdev, mddev))
3471 export_rdev(rdev);
3472 }
3473 autorun_array(mddev);
3474 mddev_unlock(mddev);
3475 }
3476 /* on success, candidates will be empty, on error
3477 * it won't...
3478 */
3479 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
3480 export_rdev(rdev);
3481 mddev_put(mddev);
3482 }
3483 printk(KERN_INFO "md: ... autorun DONE.\n");
3484}
3485
1da177e4
LT		 3486static int get_version(void __user * arg)
3487{
3488 mdu_version_t ver;
3489
3490 ver.major = MD_MAJOR_VERSION;
3491 ver.minor = MD_MINOR_VERSION;
3492 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3493
3494 if (copy_to_user(arg, &ver, sizeof(ver)))
3495 return -EFAULT;
3496
3497 return 0;
3498}
3499
3500static int get_array_info(mddev_t * mddev, void __user * arg)
3501{
3502 mdu_array_info_t info;
3503 int nr,working,active,failed,spare;
3504 mdk_rdev_t *rdev;
3505 struct list_head *tmp;
3506
3507 nr=working=active=failed=spare=0;
3508 ITERATE_RDEV(mddev,rdev,tmp) {
3509 nr++;
b2d444d7 3510 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3511 failed++;
3512 else {
3513 working++;
b2d444d7 3514 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 3515 active++;
3516 else
3517 spare++;
3518 }
3519 }
3520
3521 info.major_version = mddev->major_version;
3522 info.minor_version = mddev->minor_version;
3523 info.patch_version = MD_PATCHLEVEL_VERSION;
3524 info.ctime = mddev->ctime;
3525 info.level = mddev->level;
3526 info.size = mddev->size;
284ae7ca
N		 3527 if (info.size != mddev->size) /* overflow */
3528 info.size = -1;
1da177e4
LT		 3529 info.nr_disks = nr;
3530 info.raid_disks = mddev->raid_disks;
3531 info.md_minor = mddev->md_minor;
3532 info.not_persistent= !mddev->persistent;
3533
3534 info.utime = mddev->utime;
3535 info.state = 0;
3536 if (mddev->in_sync)
3537 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 3538 if (mddev->bitmap && mddev->bitmap_offset)
3539 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 3540 info.active_disks = active;
3541 info.working_disks = working;
3542 info.failed_disks = failed;
3543 info.spare_disks = spare;
3544
3545 info.layout = mddev->layout;
3546 info.chunk_size = mddev->chunk_size;
3547
3548 if (copy_to_user(arg, &info, sizeof(info)))
3549 return -EFAULT;
3550
3551 return 0;
3552}
3553
87162a28 3554static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 3555{
3556 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3557 char *ptr, *buf = NULL;
3558 int err = -ENOMEM;
3559
3560 file = kmalloc(sizeof(*file), GFP_KERNEL);
3561 if (!file)
3562 goto out;
3563
3564 /* bitmap disabled, zero the first byte and copy out */
3565 if (!mddev->bitmap || !mddev->bitmap->file) {
3566 file->pathname[0] = '\0';
3567 goto copy_out;
3568 }
3569
3570 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3571 if (!buf)
3572 goto out;
3573
3574 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3575 if (!ptr)
3576 goto out;
3577
3578 strcpy(file->pathname, ptr);
3579
3580copy_out:
3581 err = 0;
3582 if (copy_to_user(arg, file, sizeof(*file)))
3583 err = -EFAULT;
3584out:
3585 kfree(buf);
3586 kfree(file);
3587 return err;
3588}
3589
1da177e4
LT		 3590static int get_disk_info(mddev_t * mddev, void __user * arg)
3591{
3592 mdu_disk_info_t info;
3593 unsigned int nr;
3594 mdk_rdev_t *rdev;
3595
3596 if (copy_from_user(&info, arg, sizeof(info)))
3597 return -EFAULT;
3598
3599 nr = info.number;
3600
3601 rdev = find_rdev_nr(mddev, nr);
3602 if (rdev) {
3603 info.major = MAJOR(rdev->bdev->bd_dev);
3604 info.minor = MINOR(rdev->bdev->bd_dev);
3605 info.raid_disk = rdev->raid_disk;
3606 info.state = 0;
b2d444d7 3607 if (test_bit(Faulty, &rdev->flags))
1da177e4 3608 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 3609 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 3610 info.state |= (1<<MD_DISK_ACTIVE);
3611 info.state |= (1<<MD_DISK_SYNC);
3612 }
8ddf9efe
N		 3613 if (test_bit(WriteMostly, &rdev->flags))
3614 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 3615 } else {
3616 info.major = info.minor = 0;
3617 info.raid_disk = -1;
3618 info.state = (1<<MD_DISK_REMOVED);
3619 }
3620
3621 if (copy_to_user(arg, &info, sizeof(info)))
3622 return -EFAULT;
3623
3624 return 0;
3625}
3626
3627static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3628{
3629 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3630 mdk_rdev_t *rdev;
3631 dev_t dev = MKDEV(info->major,info->minor);
3632
3633 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3634 return -EOVERFLOW;
3635
3636 if (!mddev->raid_disks) {
3637 int err;
3638 /* expecting a device which has a superblock */
3639 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3640 if (IS_ERR(rdev)) {
3641 printk(KERN_WARNING
3642 "md: md_import_device returned %ld\n",
3643 PTR_ERR(rdev));
3644 return PTR_ERR(rdev);
3645 }
3646 if (!list_empty(&mddev->disks)) {
3647 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3648 mdk_rdev_t, same_set);
3649 int err = super_types[mddev->major_version]
3650 .load_super(rdev, rdev0, mddev->minor_version);
3651 if (err < 0) {
3652 printk(KERN_WARNING
3653 "md: %s has different UUID to %s\n",
3654 bdevname(rdev->bdev,b),
3655 bdevname(rdev0->bdev,b2));
3656 export_rdev(rdev);
3657 return -EINVAL;
3658 }
3659 }
3660 err = bind_rdev_to_array(rdev, mddev);
3661 if (err)
3662 export_rdev(rdev);
3663 return err;
3664 }
3665
3666 /*
3667 * add_new_disk can be used once the array is assembled
3668 * to add "hot spares". They must already have a superblock
3669 * written
3670 */
3671 if (mddev->pers) {
3672 int err;
3673 if (!mddev->pers->hot_add_disk) {
3674 printk(KERN_WARNING
3675 "%s: personality does not support diskops!\n",
3676 mdname(mddev));
3677 return -EINVAL;
3678 }
7b1e35f6
N		 3679 if (mddev->persistent)
3680 rdev = md_import_device(dev, mddev->major_version,
3681 mddev->minor_version);
3682 else
3683 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 3684 if (IS_ERR(rdev)) {
3685 printk(KERN_WARNING
3686 "md: md_import_device returned %ld\n",
3687 PTR_ERR(rdev));
3688 return PTR_ERR(rdev);
3689 }
41158c7e
N		 3690 /* set save_raid_disk if appropriate */
3691 if (!mddev->persistent) {
3692 if (info->state & (1<<MD_DISK_SYNC) &&
3693 info->raid_disk < mddev->raid_disks)
3694 rdev->raid_disk = info->raid_disk;
3695 else
3696 rdev->raid_disk = -1;
3697 } else
3698 super_types[mddev->major_version].
3699 validate_super(mddev, rdev);
3700 rdev->saved_raid_disk = rdev->raid_disk;
3701
b2d444d7 3702 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 3703 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3704 set_bit(WriteMostly, &rdev->flags);
3705
1da177e4
LT		 3706 rdev->raid_disk = -1;
3707 err = bind_rdev_to_array(rdev, mddev);
7c7546cc
N		 3708 if (!err && !mddev->pers->hot_remove_disk) {
3709 /* If there is hot_add_disk but no hot_remove_disk
3710 * then added disks for geometry changes,
3711 * and should be added immediately.
3712 */
3713 super_types[mddev->major_version].
3714 validate_super(mddev, rdev);
3715 err = mddev->pers->hot_add_disk(mddev, rdev);
3716 if (err)
3717 unbind_rdev_from_array(rdev);
3718 }
1da177e4
LT		 3719 if (err)
3720 export_rdev(rdev);
c361777f
N		 3721
3722 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 3723 md_wakeup_thread(mddev->thread);
1da177e4
LT		 3724 return err;
3725 }
3726
3727 /* otherwise, add_new_disk is only allowed
3728 * for major_version==0 superblocks
3729 */
3730 if (mddev->major_version != 0) {
3731 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3732 mdname(mddev));
3733 return -EINVAL;
3734 }
3735
3736 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3737 int err;
3738 rdev = md_import_device (dev, -1, 0);
3739 if (IS_ERR(rdev)) {
3740 printk(KERN_WARNING
3741 "md: error, md_import_device() returned %ld\n",
3742 PTR_ERR(rdev));
3743 return PTR_ERR(rdev);
3744 }
3745 rdev->desc_nr = info->number;
3746 if (info->raid_disk < mddev->raid_disks)
3747 rdev->raid_disk = info->raid_disk;
3748 else
3749 rdev->raid_disk = -1;
3750
b2d444d7
N		 3751 rdev->flags = 0;
3752
1da177e4 3753 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 3754 if (info->state & (1<<MD_DISK_SYNC))
3755 set_bit(In_sync, &rdev->flags);
1da177e4 3756
8ddf9efe
N		 3757 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3758 set_bit(WriteMostly, &rdev->flags);
3759
1da177e4
LT		 3760 if (!mddev->persistent) {
3761 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3762 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3763 } else
3764 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3765 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3766
2bf071bf
N		 3767 err = bind_rdev_to_array(rdev, mddev);
3768 if (err) {
3769 export_rdev(rdev);
3770 return err;
3771 }
1da177e4
LT		 3772 }
3773
3774 return 0;
3775}
3776
3777static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3778{
3779 char b[BDEVNAME_SIZE];
3780 mdk_rdev_t *rdev;
3781
3782 if (!mddev->pers)
3783 return -ENODEV;
3784
3785 rdev = find_rdev(mddev, dev);
3786 if (!rdev)
3787 return -ENXIO;
3788
3789 if (rdev->raid_disk >= 0)
3790 goto busy;
3791
3792 kick_rdev_from_array(rdev);
850b2b42 3793 md_update_sb(mddev, 1);
d7603b7e 3794 md_new_event(mddev);
1da177e4
LT		 3795
3796 return 0;
3797busy:
3798 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3799 bdevname(rdev->bdev,b), mdname(mddev));
3800 return -EBUSY;
3801}
3802
3803static int hot_add_disk(mddev_t * mddev, dev_t dev)
3804{
3805 char b[BDEVNAME_SIZE];
3806 int err;
3807 unsigned int size;
3808 mdk_rdev_t *rdev;
3809
3810 if (!mddev->pers)
3811 return -ENODEV;
3812
3813 if (mddev->major_version != 0) {
3814 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3815 " version-0 superblocks.\n",
3816 mdname(mddev));
3817 return -EINVAL;
3818 }
3819 if (!mddev->pers->hot_add_disk) {
3820 printk(KERN_WARNING
3821 "%s: personality does not support diskops!\n",
3822 mdname(mddev));
3823 return -EINVAL;
3824 }
3825
3826 rdev = md_import_device (dev, -1, 0);
3827 if (IS_ERR(rdev)) {
3828 printk(KERN_WARNING
3829 "md: error, md_import_device() returned %ld\n",
3830 PTR_ERR(rdev));
3831 return -EINVAL;
3832 }
3833
3834 if (mddev->persistent)
3835 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3836 else
3837 rdev->sb_offset =
3838 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3839
3840 size = calc_dev_size(rdev, mddev->chunk_size);
3841 rdev->size = size;
3842
b2d444d7 3843 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 3844 printk(KERN_WARNING
3845 "md: can not hot-add faulty %s disk to %s!\n",
3846 bdevname(rdev->bdev,b), mdname(mddev));
3847 err = -EINVAL;
3848 goto abort_export;
3849 }
b2d444d7 3850 clear_bit(In_sync, &rdev->flags);
1da177e4 3851 rdev->desc_nr = -1;
5842730d 3852 rdev->saved_raid_disk = -1;
2bf071bf
N		 3853 err = bind_rdev_to_array(rdev, mddev);
3854 if (err)
3855 goto abort_export;
1da177e4
LT		 3856
3857 /*
3858 * The rest should better be atomic, we can have disk failures
3859 * noticed in interrupt contexts ...
3860 */
3861
3862 if (rdev->desc_nr == mddev->max_disks) {
3863 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
3864 mdname(mddev));
3865 err = -EBUSY;
3866 goto abort_unbind_export;
3867 }
3868
3869 rdev->raid_disk = -1;
3870
850b2b42 3871 md_update_sb(mddev, 1);
1da177e4
LT		 3872
3873 /*
3874 * Kick recovery, maybe this spare has to be added to the
3875 * array immediately.
3876 */
3877 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3878 md_wakeup_thread(mddev->thread);
d7603b7e 3879 md_new_event(mddev);
1da177e4
LT		 3880 return 0;
3881
3882abort_unbind_export:
3883 unbind_rdev_from_array(rdev);
3884
3885abort_export:
3886 export_rdev(rdev);
3887 return err;
3888}
3889
32a7627c
N		 3890static int set_bitmap_file(mddev_t *mddev, int fd)
3891{
3892 int err;
3893
36fa3063
N		 3894 if (mddev->pers) {
3895 if (!mddev->pers->quiesce)
3896 return -EBUSY;
3897 if (mddev->recovery || mddev->sync_thread)
3898 return -EBUSY;
3899 /* we should be able to change the bitmap.. */
3900 }
32a7627c 3901
32a7627c 3902
36fa3063
N		 3903 if (fd >= 0) {
3904 if (mddev->bitmap)
3905 return -EEXIST; /* cannot add when bitmap is present */
3906 mddev->bitmap_file = fget(fd);
32a7627c 3907
36fa3063
N		 3908 if (mddev->bitmap_file == NULL) {
3909 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
3910 mdname(mddev));
3911 return -EBADF;
3912 }
3913
3914 err = deny_bitmap_write_access(mddev->bitmap_file);
3915 if (err) {
3916 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
3917 mdname(mddev));
3918 fput(mddev->bitmap_file);
3919 mddev->bitmap_file = NULL;
3920 return err;
3921 }
a654b9d8 3922 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 3923 } else if (mddev->bitmap == NULL)
3924 return -ENOENT; /* cannot remove what isn't there */
3925 err = 0;
3926 if (mddev->pers) {
3927 mddev->pers->quiesce(mddev, 1);
3928 if (fd >= 0)
3929 err = bitmap_create(mddev);
d7375ab3 3930 if (fd < 0 || err) {
36fa3063 3931 bitmap_destroy(mddev);
d7375ab3
N		 3932 fd = -1; /* make sure to put the file */
3933 }
36fa3063 3934 mddev->pers->quiesce(mddev, 0);
d7375ab3
N		 3935 }
3936 if (fd < 0) {
acc55e22
N		 3937 if (mddev->bitmap_file) {
3938 restore_bitmap_write_access(mddev->bitmap_file);
36fa3063 3939 fput(mddev->bitmap_file);
acc55e22 3940 }
36fa3063
N		 3941 mddev->bitmap_file = NULL;
3942 }
3943
32a7627c
N		 3944 return err;
3945}
3946
1da177e4
LT		 3947/*
3948 * set_array_info is used two different ways
3949 * The original usage is when creating a new array.
3950 * In this usage, raid_disks is > 0 and it together with
3951 * level, size, not_persistent,layout,chunksize determine the
3952 * shape of the array.
3953 * This will always create an array with a type-0.90.0 superblock.
3954 * The newer usage is when assembling an array.
3955 * In this case raid_disks will be 0, and the major_version field is
3956 * use to determine which style super-blocks are to be found on the devices.
3957 * The minor and patch _version numbers are also kept incase the
3958 * super_block handler wishes to interpret them.
3959 */
3960static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
3961{
3962
3963 if (info->raid_disks == 0) {
3964 /* just setting version number for superblock loading */
3965 if (info->major_version < 0 ||
3966 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
3967 super_types[info->major_version].name == NULL) {
3968 /* maybe try to auto-load a module? */
3969 printk(KERN_INFO
3970 "md: superblock version %d not known\n",
3971 info->major_version);
3972 return -EINVAL;
3973 }
3974 mddev->major_version = info->major_version;
3975 mddev->minor_version = info->minor_version;
3976 mddev->patch_version = info->patch_version;
3977 return 0;
3978 }
3979 mddev->major_version = MD_MAJOR_VERSION;
3980 mddev->minor_version = MD_MINOR_VERSION;
3981 mddev->patch_version = MD_PATCHLEVEL_VERSION;
3982 mddev->ctime = get_seconds();
3983
3984 mddev->level = info->level;
17115e03 3985 mddev->clevel[0] = 0;
1da177e4
LT		 3986 mddev->size = info->size;
3987 mddev->raid_disks = info->raid_disks;
3988 /* don't set md_minor, it is determined by which /dev/md* was
3989 * openned
3990 */
3991 if (info->state & (1<<MD_SB_CLEAN))
3992 mddev->recovery_cp = MaxSector;
3993 else
3994 mddev->recovery_cp = 0;
3995 mddev->persistent = ! info->not_persistent;
3996
3997 mddev->layout = info->layout;
3998 mddev->chunk_size = info->chunk_size;
3999
4000 mddev->max_disks = MD_SB_DISKS;
4001
850b2b42
N		 4002 mddev->flags = 0;
4003 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 4004
b2a2703c
N		 4005 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4006 mddev->bitmap_offset = 0;
4007
f6705578
N		 4008 mddev->reshape_position = MaxSector;
4009
1da177e4
LT		 4010 /*
4011 * Generate a 128 bit UUID
4012 */
4013 get_random_bytes(mddev->uuid, 16);
4014
f6705578
N		 4015 mddev->new_level = mddev->level;
4016 mddev->new_chunk = mddev->chunk_size;
4017 mddev->new_layout = mddev->layout;
4018 mddev->delta_disks = 0;
4019
1da177e4
LT		 4020 return 0;
4021}
4022
a35b0d69
N		 4023static int update_size(mddev_t *mddev, unsigned long size)
4024{
4025 mdk_rdev_t * rdev;
4026 int rv;
4027 struct list_head *tmp;
8ddeeae5 4028 int fit = (size == 0);
a35b0d69
N		 4029
4030 if (mddev->pers->resize == NULL)
4031 return -EINVAL;
4032 /* The "size" is the amount of each device that is used.
4033 * This can only make sense for arrays with redundancy.
4034 * linear and raid0 always use whatever space is available
4035 * We can only consider changing the size if no resync
4036 * or reconstruction is happening, and if the new size
4037 * is acceptable. It must fit before the sb_offset or,
4038 * if that is <data_offset, it must fit before the
4039 * size of each device.
4040 * If size is zero, we find the largest size that fits.
4041 */
4042 if (mddev->sync_thread)
4043 return -EBUSY;
4044 ITERATE_RDEV(mddev,rdev,tmp) {
4045 sector_t avail;
a35b0d69
N		 4046 if (rdev->sb_offset > rdev->data_offset)
4047 avail = (rdev->sb_offset*2) - rdev->data_offset;
4048 else
4049 avail = get_capacity(rdev->bdev->bd_disk)
4050 - rdev->data_offset;
4051 if (fit && (size == 0 || size > avail/2))
4052 size = avail/2;
4053 if (avail < ((sector_t)size << 1))
4054 return -ENOSPC;
4055 }
4056 rv = mddev->pers->resize(mddev, (sector_t)size *2);
4057 if (!rv) {
4058 struct block_device *bdev;
4059
4060 bdev = bdget_disk(mddev->gendisk, 0);
4061 if (bdev) {
1b1dcc1b 4062 mutex_lock(&bdev->bd_inode->i_mutex);
6d89332b 4063 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
1b1dcc1b 4064 mutex_unlock(&bdev->bd_inode->i_mutex);
a35b0d69
N		 4065 bdput(bdev);
4066 }
4067 }
4068 return rv;
4069}
4070
da943b99
N		 4071static int update_raid_disks(mddev_t *mddev, int raid_disks)
4072{
4073 int rv;
4074 /* change the number of raid disks */
63c70c4f 4075 if (mddev->pers->check_reshape == NULL)
da943b99
N		 4076 return -EINVAL;
4077 if (raid_disks <= 0 ||
4078 raid_disks >= mddev->max_disks)
4079 return -EINVAL;
63c70c4f 4080 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
da943b99 4081 return -EBUSY;
63c70c4f
N		 4082 mddev->delta_disks = raid_disks - mddev->raid_disks;
4083
4084 rv = mddev->pers->check_reshape(mddev);
da943b99
N		 4085 return rv;
4086}
4087
4088
1da177e4
LT		 4089/*
4090 * update_array_info is used to change the configuration of an
4091 * on-line array.
4092 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4093 * fields in the info are checked against the array.
4094 * Any differences that cannot be handled will cause an error.
4095 * Normally, only one change can be managed at a time.
4096 */
4097static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4098{
4099 int rv = 0;
4100 int cnt = 0;
36fa3063
N		 4101 int state = 0;
4102
4103 /* calculate expected state,ignoring low bits */
4104 if (mddev->bitmap && mddev->bitmap_offset)
4105 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 4106
4107 if (mddev->major_version != info->major_version ||
4108 mddev->minor_version != info->minor_version ||
4109/* mddev->patch_version != info->patch_version || */
4110 mddev->ctime != info->ctime ||
4111 mddev->level != info->level ||
4112/* mddev->layout != info->layout || */
4113 !mddev->persistent != info->not_persistent||
36fa3063
N		 4114 mddev->chunk_size != info->chunk_size ||
4115 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4116 ((state^info->state) & 0xfffffe00)
4117 )
1da177e4
LT		 4118 return -EINVAL;
4119 /* Check there is only one change */
284ae7ca 4120 if (info->size >= 0 && mddev->size != info->size) cnt++;
1da177e4
LT		 4121 if (mddev->raid_disks != info->raid_disks) cnt++;
4122 if (mddev->layout != info->layout) cnt++;
36fa3063 4123 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 4124 if (cnt == 0) return 0;
4125 if (cnt > 1) return -EINVAL;
4126
4127 if (mddev->layout != info->layout) {
4128 /* Change layout
4129 * we don't need to do anything at the md level, the
4130 * personality will take care of it all.
4131 */
4132 if (mddev->pers->reconfig == NULL)
4133 return -EINVAL;
4134 else
4135 return mddev->pers->reconfig(mddev, info->layout, -1);
4136 }
284ae7ca 4137 if (info->size >= 0 && mddev->size != info->size)
a35b0d69
N		 4138 rv = update_size(mddev, info->size);
4139
da943b99
N		 4140 if (mddev->raid_disks != info->raid_disks)
4141 rv = update_raid_disks(mddev, info->raid_disks);
4142
36fa3063
N		 4143 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4144 if (mddev->pers->quiesce == NULL)
4145 return -EINVAL;
4146 if (mddev->recovery || mddev->sync_thread)
4147 return -EBUSY;
4148 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4149 /* add the bitmap */
4150 if (mddev->bitmap)
4151 return -EEXIST;
4152 if (mddev->default_bitmap_offset == 0)
4153 return -EINVAL;
4154 mddev->bitmap_offset = mddev->default_bitmap_offset;
4155 mddev->pers->quiesce(mddev, 1);
4156 rv = bitmap_create(mddev);
4157 if (rv)
4158 bitmap_destroy(mddev);
4159 mddev->pers->quiesce(mddev, 0);
4160 } else {
4161 /* remove the bitmap */
4162 if (!mddev->bitmap)
4163 return -ENOENT;
4164 if (mddev->bitmap->file)
4165 return -EINVAL;
4166 mddev->pers->quiesce(mddev, 1);
4167 bitmap_destroy(mddev);
4168 mddev->pers->quiesce(mddev, 0);
4169 mddev->bitmap_offset = 0;
4170 }
4171 }
850b2b42 4172 md_update_sb(mddev, 1);
1da177e4
LT		 4173 return rv;
4174}
4175
4176static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4177{
4178 mdk_rdev_t *rdev;
4179
4180 if (mddev->pers == NULL)
4181 return -ENODEV;
4182
4183 rdev = find_rdev(mddev, dev);
4184 if (!rdev)
4185 return -ENODEV;
4186
4187 md_error(mddev, rdev);
4188 return 0;
4189}
4190
a885c8c4
CH		 4191static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4192{
4193 mddev_t *mddev = bdev->bd_disk->private_data;
4194
4195 geo->heads = 2;
4196 geo->sectors = 4;
4197 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4198 return 0;
4199}
4200
1da177e4
LT		 4201static int md_ioctl(struct inode *inode, struct file *file,
4202 unsigned int cmd, unsigned long arg)
4203{
4204 int err = 0;
4205 void __user *argp = (void __user *)arg;
1da177e4
LT		 4206 mddev_t *mddev = NULL;
4207
4208 if (!capable(CAP_SYS_ADMIN))
4209 return -EACCES;
4210
4211 /*
4212 * Commands dealing with the RAID driver but not any
4213 * particular array:
4214 */
4215 switch (cmd)
4216 {
4217 case RAID_VERSION:
4218 err = get_version(argp);
4219 goto done;
4220
4221 case PRINT_RAID_DEBUG:
4222 err = 0;
4223 md_print_devices();
4224 goto done;
4225
4226#ifndef MODULE
4227 case RAID_AUTORUN:
4228 err = 0;
4229 autostart_arrays(arg);
4230 goto done;
4231#endif
4232 default:;
4233 }
4234
4235 /*
4236 * Commands creating/starting a new array:
4237 */
4238
4239 mddev = inode->i_bdev->bd_disk->private_data;
4240
4241 if (!mddev) {
4242 BUG();
4243 goto abort;
4244 }
4245
1da177e4
LT		 4246 err = mddev_lock(mddev);
4247 if (err) {
4248 printk(KERN_INFO
4249 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4250 err, cmd);
4251 goto abort;
4252 }
4253
4254 switch (cmd)
4255 {
4256 case SET_ARRAY_INFO:
4257 {
4258 mdu_array_info_t info;
4259 if (!arg)
4260 memset(&info, 0, sizeof(info));
4261 else if (copy_from_user(&info, argp, sizeof(info))) {
4262 err = -EFAULT;
4263 goto abort_unlock;
4264 }
4265 if (mddev->pers) {
4266 err = update_array_info(mddev, &info);
4267 if (err) {
4268 printk(KERN_WARNING "md: couldn't update"
4269 " array info. %d\n", err);
4270 goto abort_unlock;
4271 }
4272 goto done_unlock;
4273 }
4274 if (!list_empty(&mddev->disks)) {
4275 printk(KERN_WARNING
4276 "md: array %s already has disks!\n",
4277 mdname(mddev));
4278 err = -EBUSY;
4279 goto abort_unlock;
4280 }
4281 if (mddev->raid_disks) {
4282 printk(KERN_WARNING
4283 "md: array %s already initialised!\n",
4284 mdname(mddev));
4285 err = -EBUSY;
4286 goto abort_unlock;
4287 }
4288 err = set_array_info(mddev, &info);
4289 if (err) {
4290 printk(KERN_WARNING "md: couldn't set"
4291 " array info. %d\n", err);
4292 goto abort_unlock;
4293 }
4294 }
4295 goto done_unlock;
4296
4297 default:;
4298 }
4299
4300 /*
4301 * Commands querying/configuring an existing array:
4302 */
32a7627c
N		 4303 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4304 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
4305 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4306 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
1da177e4
LT		 4307 err = -ENODEV;
4308 goto abort_unlock;
4309 }
4310
4311 /*
4312 * Commands even a read-only array can execute:
4313 */
4314 switch (cmd)
4315 {
4316 case GET_ARRAY_INFO:
4317 err = get_array_info(mddev, argp);
4318 goto done_unlock;
4319
32a7627c 4320 case GET_BITMAP_FILE:
87162a28 4321 err = get_bitmap_file(mddev, argp);
32a7627c
N		 4322 goto done_unlock;
4323
1da177e4
LT		 4324 case GET_DISK_INFO:
4325 err = get_disk_info(mddev, argp);
4326 goto done_unlock;
4327
4328 case RESTART_ARRAY_RW:
4329 err = restart_array(mddev);
4330 goto done_unlock;
4331
4332 case STOP_ARRAY:
4333 err = do_md_stop (mddev, 0);
4334 goto done_unlock;
4335
4336 case STOP_ARRAY_RO:
4337 err = do_md_stop (mddev, 1);
4338 goto done_unlock;
4339
4340 /*
4341 * We have a problem here : there is no easy way to give a CHS
4342 * virtual geometry. We currently pretend that we have a 2 heads
4343 * 4 sectors (with a BIG number of cylinders...). This drives
4344 * dosfs just mad... ;-)
4345 */
1da177e4
LT		 4346 }
4347
4348 /*
4349 * The remaining ioctls are changing the state of the
f91de92e
N		 4350 * superblock, so we do not allow them on read-only arrays.
4351 * However non-MD ioctls (e.g. get-size) will still come through
4352 * here and hit the 'default' below, so only disallow
4353 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 4354 */
f91de92e
N		 4355 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4356 mddev->ro && mddev->pers) {
4357 if (mddev->ro == 2) {
4358 mddev->ro = 0;
4359 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4360 md_wakeup_thread(mddev->thread);
4361
4362 } else {
4363 err = -EROFS;
4364 goto abort_unlock;
4365 }
1da177e4
LT		 4366 }
4367
4368 switch (cmd)
4369 {
4370 case ADD_NEW_DISK:
4371 {
4372 mdu_disk_info_t info;
4373 if (copy_from_user(&info, argp, sizeof(info)))
4374 err = -EFAULT;
4375 else
4376 err = add_new_disk(mddev, &info);
4377 goto done_unlock;
4378 }
4379
4380 case HOT_REMOVE_DISK:
4381 err = hot_remove_disk(mddev, new_decode_dev(arg));
4382 goto done_unlock;
4383
4384 case HOT_ADD_DISK:
4385 err = hot_add_disk(mddev, new_decode_dev(arg));
4386 goto done_unlock;
4387
4388 case SET_DISK_FAULTY:
4389 err = set_disk_faulty(mddev, new_decode_dev(arg));
4390 goto done_unlock;
4391
4392 case RUN_ARRAY:
4393 err = do_md_run (mddev);
4394 goto done_unlock;
4395
32a7627c
N		 4396 case SET_BITMAP_FILE:
4397 err = set_bitmap_file(mddev, (int)arg);
4398 goto done_unlock;
4399
1da177e4 4400 default:
1da177e4
LT		 4401 err = -EINVAL;
4402 goto abort_unlock;
4403 }
4404
4405done_unlock:
4406abort_unlock:
4407 mddev_unlock(mddev);
4408
4409 return err;
4410done:
4411 if (err)
4412 MD_BUG();
4413abort:
4414 return err;
4415}
4416
4417static int md_open(struct inode *inode, struct file *file)
4418{
4419 /*
4420 * Succeed if we can lock the mddev, which confirms that
4421 * it isn't being stopped right now.
4422 */
4423 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4424 int err;
4425
4426 if ((err = mddev_lock(mddev)))
4427 goto out;
4428
4429 err = 0;
4430 mddev_get(mddev);
4431 mddev_unlock(mddev);
4432
4433 check_disk_change(inode->i_bdev);
4434 out:
4435 return err;
4436}
4437
4438static int md_release(struct inode *inode, struct file * file)
4439{
4440 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4441
52e5f9d1 4442 BUG_ON(!mddev);
1da177e4
LT		 4443 mddev_put(mddev);
4444
4445 return 0;
4446}
4447
4448static int md_media_changed(struct gendisk *disk)
4449{
4450 mddev_t *mddev = disk->private_data;
4451
4452 return mddev->changed;
4453}
4454
4455static int md_revalidate(struct gendisk *disk)
4456{
4457 mddev_t *mddev = disk->private_data;
4458
4459 mddev->changed = 0;
4460 return 0;
4461}
4462static struct block_device_operations md_fops =
4463{
4464 .owner = THIS_MODULE,
4465 .open = md_open,
4466 .release = md_release,
4467 .ioctl = md_ioctl,
a885c8c4 4468 .getgeo = md_getgeo,
1da177e4
LT		 4469 .media_changed = md_media_changed,
4470 .revalidate_disk= md_revalidate,
4471};
4472
75c96f85 4473static int md_thread(void * arg)
1da177e4
LT		 4474{
4475 mdk_thread_t *thread = arg;
4476
1da177e4
LT		 4477 /*
4478 * md_thread is a 'system-thread', it's priority should be very
4479 * high. We avoid resource deadlocks individually in each
4480 * raid personality. (RAID5 does preallocation) We also use RR and
4481 * the very same RT priority as kswapd, thus we will never get
4482 * into a priority inversion deadlock.
4483 *
4484 * we definitely have to have equal or higher priority than
4485 * bdflush, otherwise bdflush will deadlock if there are too
4486 * many dirty RAID5 blocks.
4487 */
1da177e4 4488
6985c43f 4489 allow_signal(SIGKILL);
a6fb0934 4490 while (!kthread_should_stop()) {
1da177e4 4491
93588e22
N		 4492 /* We need to wait INTERRUPTIBLE so that
4493 * we don't add to the load-average.
4494 * That means we need to be sure no signals are
4495 * pending
4496 */
4497 if (signal_pending(current))
4498 flush_signals(current);
4499
4500 wait_event_interruptible_timeout
4501 (thread->wqueue,
4502 test_bit(THREAD_WAKEUP, &thread->flags)
4503 || kthread_should_stop(),
4504 thread->timeout);
3e1d1d28 4505 try_to_freeze();
1da177e4
LT		 4506
4507 clear_bit(THREAD_WAKEUP, &thread->flags);
4508
787453c2 4509 thread->run(thread->mddev);
1da177e4 4510 }
a6fb0934 4511
1da177e4
LT		 4512 return 0;
4513}
4514
4515void md_wakeup_thread(mdk_thread_t *thread)
4516{
4517 if (thread) {
4518 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4519 set_bit(THREAD_WAKEUP, &thread->flags);
4520 wake_up(&thread->wqueue);
4521 }
4522}
4523
4524mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4525 const char *name)
4526{
4527 mdk_thread_t *thread;
1da177e4 4528
9ffae0cf 4529 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 4530 if (!thread)
4531 return NULL;
4532
1da177e4
LT		 4533 init_waitqueue_head(&thread->wqueue);
4534
1da177e4
LT		 4535 thread->run = run;
4536 thread->mddev = mddev;
32a7627c 4537 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 4538 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 4539 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 4540 kfree(thread);
4541 return NULL;
4542 }
1da177e4
LT		 4543 return thread;
4544}
4545
1da177e4
LT		 4546void md_unregister_thread(mdk_thread_t *thread)
4547{
d28446fe 4548 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
a6fb0934
N		 4549
4550 kthread_stop(thread->tsk);
1da177e4
LT		 4551 kfree(thread);
4552}
4553
4554void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4555{
4556 if (!mddev) {
4557 MD_BUG();
4558 return;
4559 }
4560
b2d444d7 4561 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 4562 return;
32a7627c 4563/*
1da177e4
LT		 4564 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4565 mdname(mddev),
4566 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4567 __builtin_return_address(0),__builtin_return_address(1),
4568 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 4569*/
d0a0a5ee
AM		 4570 if (!mddev->pers)
4571 return;
1da177e4
LT		 4572 if (!mddev->pers->error_handler)
4573 return;
4574 mddev->pers->error_handler(mddev,rdev);
4575 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4576 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4577 md_wakeup_thread(mddev->thread);
c331eb04 4578 md_new_event_inintr(mddev);
1da177e4
LT		 4579}
4580
4581/* seq_file implementation /proc/mdstat */
4582
4583static void status_unused(struct seq_file *seq)
4584{
4585 int i = 0;
4586 mdk_rdev_t *rdev;
4587 struct list_head *tmp;
4588
4589 seq_printf(seq, "unused devices: ");
4590
4591 ITERATE_RDEV_PENDING(rdev,tmp) {
4592 char b[BDEVNAME_SIZE];
4593 i++;
4594 seq_printf(seq, "%s ",
4595 bdevname(rdev->bdev,b));
4596 }
4597 if (!i)
4598 seq_printf(seq, "<none>");
4599
4600 seq_printf(seq, "\n");
4601}
4602
4603
4604static void status_resync(struct seq_file *seq, mddev_t * mddev)
4605{
4588b42e
N		 4606 sector_t max_blocks, resync, res;
4607 unsigned long dt, db, rt;
4608 int scale;
4609 unsigned int per_milli;
1da177e4
LT		 4610
4611 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4612
4613 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4614 max_blocks = mddev->resync_max_sectors >> 1;
4615 else
4616 max_blocks = mddev->size;
4617
4618 /*
4619 * Should not happen.
4620 */
4621 if (!max_blocks) {
4622 MD_BUG();
4623 return;
4624 }
4588b42e
N		 4625 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4626 * in a sector_t, and (max_blocks>>scale) will fit in a
4627 * u32, as those are the requirements for sector_div.
4628 * Thus 'scale' must be at least 10
4629 */
4630 scale = 10;
4631 if (sizeof(sector_t) > sizeof(unsigned long)) {
4632 while ( max_blocks/2 > (1ULL<<(scale+32)))
4633 scale++;
4634 }
4635 res = (resync>>scale)*1000;
4636 sector_div(res, (u32)((max_blocks>>scale)+1));
4637
4638 per_milli = res;
1da177e4 4639 {
4588b42e 4640 int i, x = per_milli/50, y = 20-x;
1da177e4
LT		 4641 seq_printf(seq, "[");
4642 for (i = 0; i < x; i++)
4643 seq_printf(seq, "=");
4644 seq_printf(seq, ">");
4645 for (i = 0; i < y; i++)
4646 seq_printf(seq, ".");
4647 seq_printf(seq, "] ");
4648 }
4588b42e 4649 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
ccfcc3c1
N		 4650 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
4651 "reshape" :
61df9d91
N		 4652 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
4653 "check" :
4654 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4655 "resync" : "recovery"))),
4656 per_milli/10, per_milli % 10,
4588b42e
N		 4657 (unsigned long long) resync,
4658 (unsigned long long) max_blocks);
1da177e4
LT		 4659
4660 /*
4661 * We do not want to overflow, so the order of operands and
4662 * the * 100 / 100 trick are important. We do a +1 to be
4663 * safe against division by zero. We only estimate anyway.
4664 *
4665 * dt: time from mark until now
4666 * db: blocks written from mark until now
4667 * rt: remaining time
4668 */
4669 dt = ((jiffies - mddev->resync_mark) / HZ);
4670 if (!dt) dt++;
ff4e8d9a
N		 4671 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
4672 - mddev->resync_mark_cnt;
4673 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
1da177e4
LT		 4674
4675 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4676
ff4e8d9a 4677 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
1da177e4
LT		 4678}
4679
4680static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4681{
4682 struct list_head *tmp;
4683 loff_t l = *pos;
4684 mddev_t *mddev;
4685
4686 if (l >= 0x10000)
4687 return NULL;
4688 if (!l--)
4689 /* header */
4690 return (void*)1;
4691
4692 spin_lock(&all_mddevs_lock);
4693 list_for_each(tmp,&all_mddevs)
4694 if (!l--) {
4695 mddev = list_entry(tmp, mddev_t, all_mddevs);
4696 mddev_get(mddev);
4697 spin_unlock(&all_mddevs_lock);
4698 return mddev;
4699 }
4700 spin_unlock(&all_mddevs_lock);
4701 if (!l--)
4702 return (void*)2;/* tail */
4703 return NULL;
4704}
4705
4706static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4707{
4708 struct list_head *tmp;
4709 mddev_t *next_mddev, *mddev = v;
4710
4711 ++*pos;
4712 if (v == (void*)2)
4713 return NULL;
4714
4715 spin_lock(&all_mddevs_lock);
4716 if (v == (void*)1)
4717 tmp = all_mddevs.next;
4718 else
4719 tmp = mddev->all_mddevs.next;
4720 if (tmp != &all_mddevs)
4721 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4722 else {
4723 next_mddev = (void*)2;
4724 *pos = 0x10000;
4725 }
4726 spin_unlock(&all_mddevs_lock);
4727
4728 if (v != (void*)1)
4729 mddev_put(mddev);
4730 return next_mddev;
4731
4732}
4733
4734static void md_seq_stop(struct seq_file *seq, void *v)
4735{
4736 mddev_t *mddev = v;
4737
4738 if (mddev && v != (void*)1 && v != (void*)2)
4739 mddev_put(mddev);
4740}
4741
d7603b7e
N		 4742struct mdstat_info {
4743 int event;
4744};
4745
1da177e4
LT		 4746static int md_seq_show(struct seq_file *seq, void *v)
4747{
4748 mddev_t *mddev = v;
4749 sector_t size;
4750 struct list_head *tmp2;
4751 mdk_rdev_t *rdev;
d7603b7e 4752 struct mdstat_info *mi = seq->private;
32a7627c 4753 struct bitmap *bitmap;
1da177e4
LT		 4754
4755 if (v == (void*)1) {
2604b703 4756 struct mdk_personality *pers;
1da177e4
LT		 4757 seq_printf(seq, "Personalities : ");
4758 spin_lock(&pers_lock);
2604b703
N		 4759 list_for_each_entry(pers, &pers_list, list)
4760 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT		 4761
4762 spin_unlock(&pers_lock);
4763 seq_printf(seq, "\n");
d7603b7e 4764 mi->event = atomic_read(&md_event_count);
1da177e4
LT		 4765 return 0;
4766 }
4767 if (v == (void*)2) {
4768 status_unused(seq);
4769 return 0;
4770 }
4771
5dc5cf7d 4772 if (mddev_lock(mddev) < 0)
1da177e4 4773 return -EINTR;
5dc5cf7d 4774
1da177e4
LT		 4775 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4776 seq_printf(seq, "%s : %sactive", mdname(mddev),
4777 mddev->pers ? "" : "in");
4778 if (mddev->pers) {
f91de92e 4779 if (mddev->ro==1)
1da177e4 4780 seq_printf(seq, " (read-only)");
f91de92e
N		 4781 if (mddev->ro==2)
4782 seq_printf(seq, "(auto-read-only)");
1da177e4
LT		 4783 seq_printf(seq, " %s", mddev->pers->name);
4784 }
4785
4786 size = 0;
4787 ITERATE_RDEV(mddev,rdev,tmp2) {
4788 char b[BDEVNAME_SIZE];
4789 seq_printf(seq, " %s[%d]",
4790 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 4791 if (test_bit(WriteMostly, &rdev->flags))
4792 seq_printf(seq, "(W)");
b2d444d7 4793 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4794 seq_printf(seq, "(F)");
4795 continue;
b325a32e
N		 4796 } else if (rdev->raid_disk < 0)
4797 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 4798 size += rdev->size;
4799 }
4800
4801 if (!list_empty(&mddev->disks)) {
4802 if (mddev->pers)
4803 seq_printf(seq, "\n %llu blocks",
4804 (unsigned long long)mddev->array_size);
4805 else
4806 seq_printf(seq, "\n %llu blocks",
4807 (unsigned long long)size);
4808 }
1cd6bf19
N		 4809 if (mddev->persistent) {
4810 if (mddev->major_version != 0 ||
4811 mddev->minor_version != 90) {
4812 seq_printf(seq," super %d.%d",
4813 mddev->major_version,
4814 mddev->minor_version);
4815 }
4816 } else
4817 seq_printf(seq, " super non-persistent");
1da177e4
LT		 4818
4819 if (mddev->pers) {
4820 mddev->pers->status (seq, mddev);
4821 seq_printf(seq, "\n ");
8e1b39d6
N		 4822 if (mddev->pers->sync_request) {
4823 if (mddev->curr_resync > 2) {
4824 status_resync (seq, mddev);
4825 seq_printf(seq, "\n ");
4826 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4827 seq_printf(seq, "\tresync=DELAYED\n ");
4828 else if (mddev->recovery_cp < MaxSector)
4829 seq_printf(seq, "\tresync=PENDING\n ");
4830 }
32a7627c
N		 4831 } else
4832 seq_printf(seq, "\n ");
4833
4834 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 4835 unsigned long chunk_kb;
4836 unsigned long flags;
32a7627c
N		 4837 spin_lock_irqsave(&bitmap->lock, flags);
4838 chunk_kb = bitmap->chunksize >> 10;
4839 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
4840 "%lu%s chunk",
4841 bitmap->pages - bitmap->missing_pages,
4842 bitmap->pages,
4843 (bitmap->pages - bitmap->missing_pages)
4844 << (PAGE_SHIFT - 10),
4845 chunk_kb ? chunk_kb : bitmap->chunksize,
4846 chunk_kb ? "KB" : "B");
78d742d8
N		 4847 if (bitmap->file) {
4848 seq_printf(seq, ", file: ");
4849 seq_path(seq, bitmap->file->f_vfsmnt,
4850 bitmap->file->f_dentry," \t\n");
32a7627c 4851 }
78d742d8 4852
32a7627c
N		 4853 seq_printf(seq, "\n");
4854 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 4855 }
4856
4857 seq_printf(seq, "\n");
4858 }
4859 mddev_unlock(mddev);
4860
4861 return 0;
4862}
4863
4864static struct seq_operations md_seq_ops = {
4865 .start = md_seq_start,
4866 .next = md_seq_next,
4867 .stop = md_seq_stop,
4868 .show = md_seq_show,
4869};
4870
4871static int md_seq_open(struct inode *inode, struct file *file)
4872{
4873 int error;
d7603b7e
N		 4874 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
4875 if (mi == NULL)
4876 return -ENOMEM;
1da177e4
LT		 4877
4878 error = seq_open(file, &md_seq_ops);
d7603b7e
N		 4879 if (error)
4880 kfree(mi);
4881 else {
4882 struct seq_file *p = file->private_data;
4883 p->private = mi;
4884 mi->event = atomic_read(&md_event_count);
4885 }
1da177e4
LT		 4886 return error;
4887}
4888
d7603b7e
N		 4889static int md_seq_release(struct inode *inode, struct file *file)
4890{
4891 struct seq_file *m = file->private_data;
4892 struct mdstat_info *mi = m->private;
4893 m->private = NULL;
4894 kfree(mi);
4895 return seq_release(inode, file);
4896}
4897
4898static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
4899{
4900 struct seq_file *m = filp->private_data;
4901 struct mdstat_info *mi = m->private;
4902 int mask;
4903
4904 poll_wait(filp, &md_event_waiters, wait);
4905
4906 /* always allow read */
4907 mask = POLLIN | POLLRDNORM;
4908
4909 if (mi->event != atomic_read(&md_event_count))
4910 mask |= POLLERR | POLLPRI;
4911 return mask;
4912}
4913
1da177e4 4914static struct file_operations md_seq_fops = {
e24650c2 4915 .owner = THIS_MODULE,
1da177e4
LT		 4916 .open = md_seq_open,
4917 .read = seq_read,
4918 .llseek = seq_lseek,
d7603b7e
N		 4919 .release = md_seq_release,
4920 .poll = mdstat_poll,
1da177e4
LT		 4921};
4922
2604b703 4923int register_md_personality(struct mdk_personality *p)
1da177e4 4924{
1da177e4 4925 spin_lock(&pers_lock);
2604b703
N		 4926 list_add_tail(&p->list, &pers_list);
4927 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
1da177e4
LT		 4928 spin_unlock(&pers_lock);
4929 return 0;
4930}
4931
2604b703 4932int unregister_md_personality(struct mdk_personality *p)
1da177e4 4933{
2604b703 4934 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 4935 spin_lock(&pers_lock);
2604b703 4936 list_del_init(&p->list);
1da177e4
LT		 4937 spin_unlock(&pers_lock);
4938 return 0;
4939}
4940
4941static int is_mddev_idle(mddev_t *mddev)
4942{
4943 mdk_rdev_t * rdev;
4944 struct list_head *tmp;
4945 int idle;
4946 unsigned long curr_events;
4947
4948 idle = 1;
4949 ITERATE_RDEV(mddev,rdev,tmp) {
4950 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 4951 curr_events = disk_stat_read(disk, sectors[0]) +
4952 disk_stat_read(disk, sectors[1]) -
1da177e4 4953 atomic_read(&disk->sync_io);
c0e48521
N		 4954 /* The difference between curr_events and last_events
4955 * will be affected by any new non-sync IO (making
4956 * curr_events bigger) and any difference in the amount of
4957 * in-flight syncio (making current_events bigger or smaller)
4958 * The amount in-flight is currently limited to
4959 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4960 * which is at most 4096 sectors.
4961 * These numbers are fairly fragile and should be made
4962 * more robust, probably by enforcing the
4963 * 'window size' that md_do_sync sort-of uses.
4964 *
1da177e4
LT		 4965 * Note: the following is an unsigned comparison.
4966 */
c0e48521 4967 if ((curr_events - rdev->last_events + 4096) > 8192) {
1da177e4
LT		 4968 rdev->last_events = curr_events;
4969 idle = 0;
4970 }
4971 }
4972 return idle;
4973}
4974
4975void md_done_sync(mddev_t *mddev, int blocks, int ok)
4976{
4977 /* another "blocks" (512byte) blocks have been synced */
4978 atomic_sub(blocks, &mddev->recovery_active);
4979 wake_up(&mddev->recovery_wait);
4980 if (!ok) {
4981 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4982 md_wakeup_thread(mddev->thread);
4983 // stop recovery, signal do_sync ....
4984 }
4985}
4986
4987
06d91a5f
N		 4988/* md_write_start(mddev, bi)
4989 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 4990 * in superblock) before writing, schedule a superblock update
4991 * and wait for it to complete.
06d91a5f 4992 */
3d310eb7 4993void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 4994{
06d91a5f 4995 if (bio_data_dir(bi) != WRITE)
3d310eb7 4996 return;
06d91a5f 4997
f91de92e
N		 4998 BUG_ON(mddev->ro == 1);
4999 if (mddev->ro == 2) {
5000 /* need to switch to read/write */
5001 mddev->ro = 0;
5002 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5003 md_wakeup_thread(mddev->thread);
5004 }
06d91a5f 5005 atomic_inc(&mddev->writes_pending);
06d91a5f 5006 if (mddev->in_sync) {
a9701a30 5007 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 5008 if (mddev->in_sync) {
5009 mddev->in_sync = 0;
850b2b42 5010 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3d310eb7
N		 5011 md_wakeup_thread(mddev->thread);
5012 }
a9701a30 5013 spin_unlock_irq(&mddev->write_lock);
06d91a5f 5014 }
850b2b42 5015 wait_event(mddev->sb_wait, mddev->flags==0);
1da177e4
LT		 5016}
5017
5018void md_write_end(mddev_t *mddev)
5019{
5020 if (atomic_dec_and_test(&mddev->writes_pending)) {
5021 if (mddev->safemode == 2)
5022 md_wakeup_thread(mddev->thread);
16f17b39 5023 else if (mddev->safemode_delay)
1da177e4
LT		 5024 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5025 }
5026}
5027
75c96f85 5028static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
1da177e4
LT		 5029
5030#define SYNC_MARKS 10
5031#define SYNC_MARK_STEP (3*HZ)
29269553 5032void md_do_sync(mddev_t *mddev)
1da177e4
LT		 5033{
5034 mddev_t *mddev2;
5035 unsigned int currspeed = 0,
5036 window;
57afd89f 5037 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 5038 unsigned long mark[SYNC_MARKS];
5039 sector_t mark_cnt[SYNC_MARKS];
5040 int last_mark,m;
5041 struct list_head *tmp;
5042 sector_t last_check;
57afd89f 5043 int skipped = 0;
5fd6c1dc
N		 5044 struct list_head *rtmp;
5045 mdk_rdev_t *rdev;
61df9d91 5046 char *desc;
1da177e4
LT		 5047
5048 /* just incase thread restarts... */
5049 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5050 return;
5fd6c1dc
N		 5051 if (mddev->ro) /* never try to sync a read-only array */
5052 return;
1da177e4 5053
61df9d91
N		 5054 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5055 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5056 desc = "data-check";
5057 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5058 desc = "requested-resync";
5059 else
5060 desc = "resync";
5061 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5062 desc = "reshape";
5063 else
5064 desc = "recovery";
5065
1da177e4
LT		 5066 /* we overload curr_resync somewhat here.
5067 * 0 == not engaged in resync at all
5068 * 2 == checking that there is no conflict with another sync
5069 * 1 == like 2, but have yielded to allow conflicting resync to
5070 * commense
5071 * other == active in resync - this many blocks
5072 *
5073 * Before starting a resync we must have set curr_resync to
5074 * 2, and then checked that every "conflicting" array has curr_resync
5075 * less than ours. When we find one that is the same or higher
5076 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5077 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5078 * This will mean we have to start checking from the beginning again.
5079 *
5080 */
5081
5082 do {
5083 mddev->curr_resync = 2;
5084
5085 try_again:
787453c2 5086 if (kthread_should_stop()) {
6985c43f 5087 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 5088 goto skip;
5089 }
5090 ITERATE_MDDEV(mddev2,tmp) {
1da177e4
LT		 5091 if (mddev2 == mddev)
5092 continue;
5093 if (mddev2->curr_resync &&
5094 match_mddev_units(mddev,mddev2)) {
5095 DEFINE_WAIT(wq);
5096 if (mddev < mddev2 && mddev->curr_resync == 2) {
5097 /* arbitrarily yield */
5098 mddev->curr_resync = 1;
5099 wake_up(&resync_wait);
5100 }
5101 if (mddev > mddev2 && mddev->curr_resync == 1)
5102 /* no need to wait here, we can wait the next
5103 * time 'round when curr_resync == 2
5104 */
5105 continue;
787453c2
N		 5106 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5107 if (!kthread_should_stop() &&
8712e553 5108 mddev2->curr_resync >= mddev->curr_resync) {
61df9d91
N		 5109 printk(KERN_INFO "md: delaying %s of %s"
5110 " until %s has finished (they"
1da177e4 5111 " share one or more physical units)\n",
61df9d91 5112 desc, mdname(mddev), mdname(mddev2));
1da177e4
LT		 5113 mddev_put(mddev2);
5114 schedule();
5115 finish_wait(&resync_wait, &wq);
5116 goto try_again;
5117 }
5118 finish_wait(&resync_wait, &wq);
5119 }
5120 }
5121 } while (mddev->curr_resync < 2);
5122
5fd6c1dc 5123 j = 0;
9d88883e 5124 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 5125 /* resync follows the size requested by the personality,
57afd89f 5126 * which defaults to physical size, but can be virtual size
1da177e4
LT		 5127 */
5128 max_sectors = mddev->resync_max_sectors;
9d88883e 5129 mddev->resync_mismatches = 0;
5fd6c1dc
N		 5130 /* we don't use the checkpoint if there's a bitmap */
5131 if (!mddev->bitmap &&
5132 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5133 j = mddev->recovery_cp;
ccfcc3c1
N		 5134 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5135 max_sectors = mddev->size << 1;
5fd6c1dc 5136 else {
1da177e4
LT		 5137 /* recovery follows the physical size of devices */
5138 max_sectors = mddev->size << 1;
5fd6c1dc
N		 5139 j = MaxSector;
5140 ITERATE_RDEV(mddev,rdev,rtmp)
5141 if (rdev->raid_disk >= 0 &&
5142 !test_bit(Faulty, &rdev->flags) &&
5143 !test_bit(In_sync, &rdev->flags) &&
5144 rdev->recovery_offset < j)
5145 j = rdev->recovery_offset;
5146 }
1da177e4 5147
61df9d91
N		 5148 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5149 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5150 " %d KB/sec/disk.\n", speed_min(mddev));
338cec32 5151 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
61df9d91
N		 5152 "(but not more than %d KB/sec) for %s.\n",
5153 speed_max(mddev), desc);
1da177e4
LT		 5154
5155 is_mddev_idle(mddev); /* this also initializes IO event counters */
5fd6c1dc 5156
57afd89f 5157 io_sectors = 0;
1da177e4
LT		 5158 for (m = 0; m < SYNC_MARKS; m++) {
5159 mark[m] = jiffies;
57afd89f 5160 mark_cnt[m] = io_sectors;
1da177e4
LT		 5161 }
5162 last_mark = 0;
5163 mddev->resync_mark = mark[last_mark];
5164 mddev->resync_mark_cnt = mark_cnt[last_mark];
5165
5166 /*
5167 * Tune reconstruction:
5168 */
5169 window = 32*(PAGE_SIZE/512);
5170 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5171 window/2,(unsigned long long) max_sectors/2);
5172
5173 atomic_set(&mddev->recovery_active, 0);
5174 init_waitqueue_head(&mddev->recovery_wait);
5175 last_check = 0;
5176
5177 if (j>2) {
5178 printk(KERN_INFO
61df9d91
N		 5179 "md: resuming %s of %s from checkpoint.\n",
5180 desc, mdname(mddev));
1da177e4
LT		 5181 mddev->curr_resync = j;
5182 }
5183
5184 while (j < max_sectors) {
57afd89f 5185 sector_t sectors;
1da177e4 5186
57afd89f
N		 5187 skipped = 0;
5188 sectors = mddev->pers->sync_request(mddev, j, &skipped,
88202a0c 5189 currspeed < speed_min(mddev));
57afd89f 5190 if (sectors == 0) {
1da177e4
LT		 5191 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5192 goto out;
5193 }
57afd89f
N		 5194
5195 if (!skipped) { /* actual IO requested */
5196 io_sectors += sectors;
5197 atomic_add(sectors, &mddev->recovery_active);
5198 }
5199
1da177e4
LT		 5200 j += sectors;
5201 if (j>1) mddev->curr_resync = j;
ff4e8d9a 5202 mddev->curr_mark_cnt = io_sectors;
d7603b7e
N		 5203 if (last_check == 0)
5204 /* this is the earliers that rebuilt will be
5205 * visible in /proc/mdstat
5206 */
5207 md_new_event(mddev);
57afd89f
N		 5208
5209 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 5210 continue;
5211
57afd89f 5212 last_check = io_sectors;
1da177e4
LT		 5213
5214 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
5215 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
5216 break;
5217
5218 repeat:
5219 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5220 /* step marks */
5221 int next = (last_mark+1) % SYNC_MARKS;
5222
5223 mddev->resync_mark = mark[next];
5224 mddev->resync_mark_cnt = mark_cnt[next];
5225 mark[next] = jiffies;
57afd89f 5226 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 5227 last_mark = next;
5228 }
5229
5230
787453c2 5231 if (kthread_should_stop()) {
1da177e4
LT		 5232 /*
5233 * got a signal, exit.
5234 */
5235 printk(KERN_INFO
5236 "md: md_do_sync() got signal ... exiting\n");
1da177e4
LT		 5237 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5238 goto out;
5239 }
5240
5241 /*
5242 * this loop exits only if either when we are slower than
5243 * the 'hard' speed limit, or the system was IO-idle for
5244 * a jiffy.
5245 * the system might be non-idle CPU-wise, but we only care
5246 * about not overloading the IO subsystem. (things like an
5247 * e2fsck being done on the RAID array should execute fast)
5248 */
5249 mddev->queue->unplug_fn(mddev->queue);
5250 cond_resched();
5251
57afd89f
N		 5252 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5253 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4 5254
88202a0c
N		 5255 if (currspeed > speed_min(mddev)) {
5256 if ((currspeed > speed_max(mddev)) ||
1da177e4 5257 !is_mddev_idle(mddev)) {
c0e48521 5258 msleep(500);
1da177e4
LT		 5259 goto repeat;
5260 }
5261 }
5262 }
61df9d91 5263 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
1da177e4
LT		 5264 /*
5265 * this also signals 'finished resyncing' to md_stop
5266 */
5267 out:
5268 mddev->queue->unplug_fn(mddev->queue);
5269
5270 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5271
5272 /* tell personality that we are finished */
57afd89f 5273 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 5274
5275 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
ccfcc3c1
N		 5276 test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
5277 !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5fd6c1dc
N		 5278 mddev->curr_resync > 2) {
5279 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5280 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5281 if (mddev->curr_resync >= mddev->recovery_cp) {
5282 printk(KERN_INFO
61df9d91
N		 5283 "md: checkpointing %s of %s.\n",
5284 desc, mdname(mddev));
5fd6c1dc
N		 5285 mddev->recovery_cp = mddev->curr_resync;
5286 }
5287 } else
5288 mddev->recovery_cp = MaxSector;
5289 } else {
5290 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5291 mddev->curr_resync = MaxSector;
5292 ITERATE_RDEV(mddev,rdev,rtmp)
5293 if (rdev->raid_disk >= 0 &&
5294 !test_bit(Faulty, &rdev->flags) &&
5295 !test_bit(In_sync, &rdev->flags) &&
5296 rdev->recovery_offset < mddev->curr_resync)
5297 rdev->recovery_offset = mddev->curr_resync;
5fd6c1dc 5298 }
1da177e4
LT		 5299 }
5300
1da177e4
LT		 5301 skip:
5302 mddev->curr_resync = 0;
5303 wake_up(&resync_wait);
5304 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5305 md_wakeup_thread(mddev->thread);
5306}
29269553 5307EXPORT_SYMBOL_GPL(md_do_sync);
1da177e4
LT		 5308
5309
5310/*
5311 * This routine is regularly called by all per-raid-array threads to
5312 * deal with generic issues like resync and super-block update.
5313 * Raid personalities that don't have a thread (linear/raid0) do not
5314 * need this as they never do any recovery or update the superblock.
5315 *
5316 * It does not do any resync itself, but rather "forks" off other threads
5317 * to do that as needed.
5318 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5319 * "->recovery" and create a thread at ->sync_thread.
5320 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5321 * and wakeups up this thread which will reap the thread and finish up.
5322 * This thread also removes any faulty devices (with nr_pending == 0).
5323 *
5324 * The overall approach is:
5325 * 1/ if the superblock needs updating, update it.
5326 * 2/ If a recovery thread is running, don't do anything else.
5327 * 3/ If recovery has finished, clean up, possibly marking spares active.
5328 * 4/ If there are any faulty devices, remove them.
5329 * 5/ If array is degraded, try to add spares devices
5330 * 6/ If array has spares or is not in-sync, start a resync thread.
5331 */
5332void md_check_recovery(mddev_t *mddev)
5333{
5334 mdk_rdev_t *rdev;
5335 struct list_head *rtmp;
5336
5337
5f40402d
N		 5338 if (mddev->bitmap)
5339 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 5340
5341 if (mddev->ro)
5342 return;
fca4d848
N		 5343
5344 if (signal_pending(current)) {
5345 if (mddev->pers->sync_request) {
5346 printk(KERN_INFO "md: %s in immediate safe mode\n",
5347 mdname(mddev));
5348 mddev->safemode = 2;
5349 }
5350 flush_signals(current);
5351 }
5352
1da177e4 5353 if ( ! (
850b2b42 5354 mddev->flags ||
1da177e4 5355 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848
N		 5356 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
5357 (mddev->safemode == 1) ||
5358 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5359 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 5360 ))
5361 return;
fca4d848 5362
df5b89b3 5363 if (mddev_trylock(mddev)) {
1da177e4 5364 int spares =0;
fca4d848 5365
a9701a30 5366 spin_lock_irq(&mddev->write_lock);
fca4d848
N		 5367 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
5368 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
5369 mddev->in_sync = 1;
850b2b42 5370 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
fca4d848
N		 5371 }
5372 if (mddev->safemode == 1)
5373 mddev->safemode = 0;
a9701a30 5374 spin_unlock_irq(&mddev->write_lock);
fca4d848 5375
850b2b42
N		 5376 if (mddev->flags)
5377 md_update_sb(mddev, 0);
06d91a5f 5378
06d91a5f 5379
1da177e4
LT		 5380 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
5381 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
5382 /* resync/recovery still happening */
5383 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5384 goto unlock;
5385 }
5386 if (mddev->sync_thread) {
5387 /* resync has finished, collect result */
5388 md_unregister_thread(mddev->sync_thread);
5389 mddev->sync_thread = NULL;
5390 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5391 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5392 /* success...*/
5393 /* activate any spares */
5394 mddev->pers->spare_active(mddev);
5395 }
850b2b42 5396 md_update_sb(mddev, 1);
41158c7e
N		 5397
5398 /* if array is no-longer degraded, then any saved_raid_disk
5399 * information must be scrapped
5400 */
5401 if (!mddev->degraded)
5402 ITERATE_RDEV(mddev,rdev,rtmp)
5403 rdev->saved_raid_disk = -1;
5404
1da177e4
LT		 5405 mddev->recovery = 0;
5406 /* flag recovery needed just to double check */
5407 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
d7603b7e 5408 md_new_event(mddev);
1da177e4
LT		 5409 goto unlock;
5410 }
24dd469d
N		 5411 /* Clear some bits that don't mean anything, but
5412 * might be left set
5413 */
5414 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5415 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
5416 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
5417 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4 5418
5fd6c1dc
N		 5419 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5420 goto unlock;
1da177e4
LT		 5421 /* no recovery is running.
5422 * remove any failed drives, then
5423 * add spares if possible.
5424 * Spare are also removed and re-added, to allow
5425 * the personality to fail the re-add.
5426 */
5427 ITERATE_RDEV(mddev,rdev,rtmp)
5428 if (rdev->raid_disk >= 0 &&
b2d444d7 5429 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
1da177e4 5430 atomic_read(&rdev->nr_pending)==0) {
86e6ffdd
N		 5431 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
5432 char nm[20];
5433 sprintf(nm,"rd%d", rdev->raid_disk);
5434 sysfs_remove_link(&mddev->kobj, nm);
1da177e4 5435 rdev->raid_disk = -1;
86e6ffdd 5436 }
1da177e4
LT		 5437 }
5438
5439 if (mddev->degraded) {
5440 ITERATE_RDEV(mddev,rdev,rtmp)
5441 if (rdev->raid_disk < 0
b2d444d7 5442 && !test_bit(Faulty, &rdev->flags)) {
5fd6c1dc 5443 rdev->recovery_offset = 0;
86e6ffdd
N		 5444 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5445 char nm[20];
5446 sprintf(nm, "rd%d", rdev->raid_disk);
5447 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
1da177e4 5448 spares++;
d7603b7e 5449 md_new_event(mddev);
86e6ffdd 5450 } else
1da177e4
LT		 5451 break;
5452 }
5453 }
5454
24dd469d
N		 5455 if (spares) {
5456 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5457 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5458 } else if (mddev->recovery_cp < MaxSector) {
5459 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5460 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5461 /* nothing to be done ... */
1da177e4 5462 goto unlock;
24dd469d 5463
1da177e4
LT		 5464 if (mddev->pers->sync_request) {
5465 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 5466 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
5467 /* We are adding a device or devices to an array
5468 * which has the bitmap stored on all devices.
5469 * So make sure all bitmap pages get written
5470 */
5471 bitmap_write_all(mddev->bitmap);
5472 }
1da177e4
LT		 5473 mddev->sync_thread = md_register_thread(md_do_sync,
5474 mddev,
5475 "%s_resync");
5476 if (!mddev->sync_thread) {
5477 printk(KERN_ERR "%s: could not start resync"
5478 " thread...\n",
5479 mdname(mddev));
5480 /* leave the spares where they are, it shouldn't hurt */
5481 mddev->recovery = 0;
d7603b7e 5482 } else
1da177e4 5483 md_wakeup_thread(mddev->sync_thread);
d7603b7e 5484 md_new_event(mddev);
1da177e4
LT		 5485 }
5486 unlock:
5487 mddev_unlock(mddev);
5488 }
5489}
5490
75c96f85
AB		 5491static int md_notify_reboot(struct notifier_block *this,
5492 unsigned long code, void *x)
1da177e4
LT		 5493{
5494 struct list_head *tmp;
5495 mddev_t *mddev;
5496
5497 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
5498
5499 printk(KERN_INFO "md: stopping all md devices.\n");
5500
5501 ITERATE_MDDEV(mddev,tmp)
c71d4887 5502 if (mddev_trylock(mddev)) {
1da177e4 5503 do_md_stop (mddev, 1);
c71d4887
NB		 5504 mddev_unlock(mddev);
5505 }
1da177e4
LT		 5506 /*
5507 * certain more exotic SCSI devices are known to be
5508 * volatile wrt too early system reboots. While the
5509 * right place to handle this issue is the given
5510 * driver, we do want to have a safe RAID driver ...
5511 */
5512 mdelay(1000*1);
5513 }
5514 return NOTIFY_DONE;
5515}
5516
75c96f85 5517static struct notifier_block md_notifier = {
1da177e4
LT		 5518 .notifier_call = md_notify_reboot,
5519 .next = NULL,
5520 .priority = INT_MAX, /* before any real devices */
5521};
5522
5523static void md_geninit(void)
5524{
5525 struct proc_dir_entry *p;
5526
5527 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5528
5529 p = create_proc_entry("mdstat", S_IRUGO, NULL);
5530 if (p)
5531 p->proc_fops = &md_seq_fops;
5532}
5533
75c96f85 5534static int __init md_init(void)
1da177e4 5535{
1da177e4
LT		 5536 if (register_blkdev(MAJOR_NR, "md"))
5537 return -1;
5538 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
5539 unregister_blkdev(MAJOR_NR, "md");
5540 return -1;
5541 }
e8703fe1
N		 5542 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
5543 md_probe, NULL, NULL);
5544 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
1da177e4
LT		 5545 md_probe, NULL, NULL);
5546
1da177e4
LT		 5547 register_reboot_notifier(&md_notifier);
5548 raid_table_header = register_sysctl_table(raid_root_table, 1);
5549
5550 md_geninit();
5551 return (0);
5552}
5553
5554
5555#ifndef MODULE
5556
5557/*
5558 * Searches all registered partitions for autorun RAID arrays
5559 * at boot time.
5560 */
5561static dev_t detected_devices[128];
5562static int dev_cnt;
5563
5564void md_autodetect_dev(dev_t dev)
5565{
5566 if (dev_cnt >= 0 && dev_cnt < 127)
5567 detected_devices[dev_cnt++] = dev;
5568}
5569
5570
5571static void autostart_arrays(int part)
5572{
5573 mdk_rdev_t *rdev;
5574 int i;
5575
5576 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
5577
5578 for (i = 0; i < dev_cnt; i++) {
5579 dev_t dev = detected_devices[i];
5580
5581 rdev = md_import_device(dev,0, 0);
5582 if (IS_ERR(rdev))
5583 continue;
5584
b2d444d7 5585 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 5586 MD_BUG();
5587 continue;
5588 }
5589 list_add(&rdev->same_set, &pending_raid_disks);
5590 }
5591 dev_cnt = 0;
5592
5593 autorun_devices(part);
5594}
5595
5596#endif
5597
5598static __exit void md_exit(void)
5599{
5600 mddev_t *mddev;
5601 struct list_head *tmp;
8ab5e4c1 5602
e8703fe1
N		 5603 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
5604 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
1da177e4
LT		 5605
5606 unregister_blkdev(MAJOR_NR,"md");
5607 unregister_blkdev(mdp_major, "mdp");
5608 unregister_reboot_notifier(&md_notifier);
5609 unregister_sysctl_table(raid_table_header);
5610 remove_proc_entry("mdstat", NULL);
5611 ITERATE_MDDEV(mddev,tmp) {
5612 struct gendisk *disk = mddev->gendisk;
5613 if (!disk)
5614 continue;
5615 export_array(mddev);
5616 del_gendisk(disk);
5617 put_disk(disk);
5618 mddev->gendisk = NULL;
5619 mddev_put(mddev);
5620 }
5621}
5622
5623module_init(md_init)
5624module_exit(md_exit)
5625
f91de92e
N		 5626static int get_ro(char *buffer, struct kernel_param *kp)
5627{
5628 return sprintf(buffer, "%d", start_readonly);
5629}
5630static int set_ro(const char *val, struct kernel_param *kp)
5631{
5632 char *e;
5633 int num = simple_strtoul(val, &e, 10);
5634 if (*val && (*e == '\0' || *e == '\n')) {
5635 start_readonly = num;
4dbcdc75 5636 return 0;
f91de92e
N		 5637 }
5638 return -EINVAL;
5639}
5640
80ca3a44
N		 5641module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
5642module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6ff8d8ec 5643
f91de92e 5644
1da177e4
LT		 5645EXPORT_SYMBOL(register_md_personality);
5646EXPORT_SYMBOL(unregister_md_personality);
5647EXPORT_SYMBOL(md_error);
5648EXPORT_SYMBOL(md_done_sync);
5649EXPORT_SYMBOL(md_write_start);
5650EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 5651EXPORT_SYMBOL(md_register_thread);
5652EXPORT_SYMBOL(md_unregister_thread);
5653EXPORT_SYMBOL(md_wakeup_thread);
1da177e4
LT		 5654EXPORT_SYMBOL(md_check_recovery);
5655MODULE_LICENSE("GPL");
aa1595e9 5656MODULE_ALIAS("md");
72008652 5657MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
Linux 6.x block layer and io_uring tree(s)