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mm: madvise avoid exclusive mmap_sem
[GitHub/mt8127/android_kernel_alcatel_ttab.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 41#include <linux/buffer_head.h> /* for invalidate_bdev */
d7603b7e 42#include <linux/poll.h>
48c9c27b 43#include <linux/mutex.h>
16f17b39 44#include <linux/ctype.h>
7dfb7103 45#include <linux/freezer.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
1c05b4bc 977static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1da177e4 978{
1c05b4bc
N		 979 __le32 disk_csum;
980 u32 csum;
1da177e4
LT		 981 unsigned long long newcsum;
982 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1c05b4bc 983 __le32 *isuper = (__le32*)sb;
1da177e4
LT		 984 int i;
985
986 disk_csum = sb->sb_csum;
987 sb->sb_csum = 0;
988 newcsum = 0;
989 for (i=0; size>=4; size -= 4 )
990 newcsum += le32_to_cpu(*isuper++);
991
992 if (size == 2)
1c05b4bc 993 newcsum += le16_to_cpu(*(__le16*) isuper);
1da177e4
LT		 994
995 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
996 sb->sb_csum = disk_csum;
997 return cpu_to_le32(csum);
998}
999
1000static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1001{
1002 struct mdp_superblock_1 *sb;
1003 int ret;
1004 sector_t sb_offset;
1005 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 1006 int bmask;
1da177e4
LT		 1007
1008 /*
1009 * Calculate the position of the superblock.
1010 * It is always aligned to a 4K boundary and
1011 * depeding on minor_version, it can be:
1012 * 0: At least 8K, but less than 12K, from end of device
1013 * 1: At start of device
1014 * 2: 4K from start of device.
1015 */
1016 switch(minor_version) {
1017 case 0:
1018 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1019 sb_offset -= 8*2;
39730960 1020 sb_offset &= ~(sector_t)(4*2-1);
1da177e4
LT		 1021 /* convert from sectors to K */
1022 sb_offset /= 2;
1023 break;
1024 case 1:
1025 sb_offset = 0;
1026 break;
1027 case 2:
1028 sb_offset = 4;
1029 break;
1030 default:
1031 return -EINVAL;
1032 }
1033 rdev->sb_offset = sb_offset;
1034
0002b271
N		 1035 /* superblock is rarely larger than 1K, but it can be larger,
1036 * and it is safe to read 4k, so we do that
1037 */
1038 ret = read_disk_sb(rdev, 4096);
1da177e4
LT		 1039 if (ret) return ret;
1040
1041
1042 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1043
1044 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1045 sb->major_version != cpu_to_le32(1) ||
1046 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1047 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
71c0805c 1048 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT		 1049 return -EINVAL;
1050
1051 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1052 printk("md: invalid superblock checksum on %s\n",
1053 bdevname(rdev->bdev,b));
1054 return -EINVAL;
1055 }
1056 if (le64_to_cpu(sb->data_size) < 10) {
1057 printk("md: data_size too small on %s\n",
1058 bdevname(rdev->bdev,b));
1059 return -EINVAL;
1060 }
1061 rdev->preferred_minor = 0xffff;
1062 rdev->data_offset = le64_to_cpu(sb->data_offset);
4dbcdc75 1063 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1da177e4 1064
0002b271 1065 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
720a3dc3 1066 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
0002b271
N		 1067 if (rdev->sb_size & bmask)
1068 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1069
31b65a0d
N		 1070 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1071 rdev->desc_nr = -1;
1072 else
1073 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1074
1da177e4 1075 if (refdev == 0)
8ed75463 1076 ret = 1;
1da177e4
LT		 1077 else {
1078 __u64 ev1, ev2;
1079 struct mdp_superblock_1 *refsb =
1080 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1081
1082 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1083 sb->level != refsb->level ||
1084 sb->layout != refsb->layout ||
1085 sb->chunksize != refsb->chunksize) {
1086 printk(KERN_WARNING "md: %s has strangely different"
1087 " superblock to %s\n",
1088 bdevname(rdev->bdev,b),
1089 bdevname(refdev->bdev,b2));
1090 return -EINVAL;
1091 }
1092 ev1 = le64_to_cpu(sb->events);
1093 ev2 = le64_to_cpu(refsb->events);
1094
1095 if (ev1 > ev2)
8ed75463
N		 1096 ret = 1;
1097 else
1098 ret = 0;
1da177e4
LT		 1099 }
1100 if (minor_version)
1101 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1102 else
1103 rdev->size = rdev->sb_offset;
1104 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1105 return -EINVAL;
1106 rdev->size = le64_to_cpu(sb->data_size)/2;
1107 if (le32_to_cpu(sb->chunksize))
1108 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
2bf071bf 1109
1c05b4bc 1110 if (le64_to_cpu(sb->size) > rdev->size*2)
2bf071bf 1111 return -EINVAL;
8ed75463 1112 return ret;
1da177e4
LT		 1113}
1114
1115static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1116{
1117 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
07d84d10 1118 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4 1119
41158c7e 1120 rdev->raid_disk = -1;
b2d444d7 1121 rdev->flags = 0;
1da177e4
LT		 1122 if (mddev->raid_disks == 0) {
1123 mddev->major_version = 1;
1124 mddev->patch_version = 0;
1125 mddev->persistent = 1;
1126 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1127 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1128 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1129 mddev->level = le32_to_cpu(sb->level);
d9d166c2 1130 mddev->clevel[0] = 0;
1da177e4
LT		 1131 mddev->layout = le32_to_cpu(sb->layout);
1132 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1133 mddev->size = le64_to_cpu(sb->size)/2;
07d84d10 1134 mddev->events = ev1;
9223214e 1135 mddev->bitmap_offset = 0;
29fc7e3e 1136 mddev->default_bitmap_offset = 1024 >> 9;
1da177e4
LT		 1137
1138 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1139 memcpy(mddev->uuid, sb->set_uuid, 16);
1140
1141 mddev->max_disks = (4096-256)/2;
a654b9d8 1142
71c0805c 1143 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
a654b9d8 1144 mddev->bitmap_file == NULL ) {
6cce3b23
N		 1145 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
1146 && mddev->level != 10) {
1147 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
a654b9d8
N		 1148 return -EINVAL;
1149 }
1150 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1151 }
f6705578
N		 1152 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1153 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1154 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1155 mddev->new_level = le32_to_cpu(sb->new_level);
1156 mddev->new_layout = le32_to_cpu(sb->new_layout);
1157 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1158 } else {
1159 mddev->reshape_position = MaxSector;
1160 mddev->delta_disks = 0;
1161 mddev->new_level = mddev->level;
1162 mddev->new_layout = mddev->layout;
1163 mddev->new_chunk = mddev->chunk_size;
1164 }
1165
41158c7e
N		 1166 } else if (mddev->pers == NULL) {
1167 /* Insist of good event counter while assembling */
1da177e4
LT		 1168 ++ev1;
1169 if (ev1 < mddev->events)
1170 return -EINVAL;
41158c7e
N		 1171 } else if (mddev->bitmap) {
1172 /* If adding to array with a bitmap, then we can accept an
1173 * older device, but not too old.
1174 */
41158c7e
N		 1175 if (ev1 < mddev->bitmap->events_cleared)
1176 return 0;
07d84d10
N		 1177 } else {
1178 if (ev1 < mddev->events)
1179 /* just a hot-add of a new device, leave raid_disk at -1 */
1180 return 0;
1181 }
1da177e4
LT		 1182 if (mddev->level != LEVEL_MULTIPATH) {
1183 int role;
1da177e4
LT		 1184 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1185 switch(role) {
1186 case 0xffff: /* spare */
1da177e4
LT		 1187 break;
1188 case 0xfffe: /* faulty */
b2d444d7 1189 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 1190 break;
1191 default:
5fd6c1dc
N		 1192 if ((le32_to_cpu(sb->feature_map) &
1193 MD_FEATURE_RECOVERY_OFFSET))
1194 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1195 else
1196 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1197 rdev->raid_disk = role;
1198 break;
1199 }
8ddf9efe
N		 1200 if (sb->devflags & WriteMostly1)
1201 set_bit(WriteMostly, &rdev->flags);
41158c7e 1202 } else /* MULTIPATH are always insync */
b2d444d7 1203 set_bit(In_sync, &rdev->flags);
41158c7e 1204
1da177e4
LT		 1205 return 0;
1206}
1207
1208static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1209{
1210 struct mdp_superblock_1 *sb;
1211 struct list_head *tmp;
1212 mdk_rdev_t *rdev2;
1213 int max_dev, i;
1214 /* make rdev->sb match mddev and rdev data. */
1215
1216 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1217
1218 sb->feature_map = 0;
1219 sb->pad0 = 0;
5fd6c1dc 1220 sb->recovery_offset = cpu_to_le64(0);
1da177e4
LT		 1221 memset(sb->pad1, 0, sizeof(sb->pad1));
1222 memset(sb->pad2, 0, sizeof(sb->pad2));
1223 memset(sb->pad3, 0, sizeof(sb->pad3));
1224
1225 sb->utime = cpu_to_le64((__u64)mddev->utime);
1226 sb->events = cpu_to_le64(mddev->events);
1227 if (mddev->in_sync)
1228 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1229 else
1230 sb->resync_offset = cpu_to_le64(0);
1231
1c05b4bc 1232 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
4dbcdc75 1233
f0ca340c 1234 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
29fc7e3e 1235 sb->size = cpu_to_le64(mddev->size<<1);
f0ca340c 1236
a654b9d8
N		 1237 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1238 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
71c0805c 1239 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8 1240 }
5fd6c1dc
N		 1241
1242 if (rdev->raid_disk >= 0 &&
1243 !test_bit(In_sync, &rdev->flags) &&
1244 rdev->recovery_offset > 0) {
1245 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1246 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1247 }
1248
f6705578
N		 1249 if (mddev->reshape_position != MaxSector) {
1250 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1251 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1252 sb->new_layout = cpu_to_le32(mddev->new_layout);
1253 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1254 sb->new_level = cpu_to_le32(mddev->new_level);
1255 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1256 }
a654b9d8 1257
1da177e4
LT		 1258 max_dev = 0;
1259 ITERATE_RDEV(mddev,rdev2,tmp)
1260 if (rdev2->desc_nr+1 > max_dev)
1261 max_dev = rdev2->desc_nr+1;
1262
1263 sb->max_dev = cpu_to_le32(max_dev);
1264 for (i=0; i<max_dev;i++)
1265 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1266
1267 ITERATE_RDEV(mddev,rdev2,tmp) {
1268 i = rdev2->desc_nr;
b2d444d7 1269 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1270 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1271 else if (test_bit(In_sync, &rdev2->flags))
1da177e4 1272 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
5fd6c1dc
N		 1273 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1274 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1da177e4
LT		 1275 else
1276 sb->dev_roles[i] = cpu_to_le16(0xffff);
1277 }
1278
1da177e4
LT		 1279 sb->sb_csum = calc_sb_1_csum(sb);
1280}
1281
1282
75c96f85 1283static struct super_type super_types[] = {
1da177e4
LT		 1284 [0] = {
1285 .name = "0.90.0",
1286 .owner = THIS_MODULE,
1287 .load_super = super_90_load,
1288 .validate_super = super_90_validate,
1289 .sync_super = super_90_sync,
1290 },
1291 [1] = {
1292 .name = "md-1",
1293 .owner = THIS_MODULE,
1294 .load_super = super_1_load,
1295 .validate_super = super_1_validate,
1296 .sync_super = super_1_sync,
1297 },
1298};
1da177e4
LT		 1299
1300static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1301{
7dd5e7c3
N		 1302 struct list_head *tmp, *tmp2;
1303 mdk_rdev_t *rdev, *rdev2;
1da177e4
LT		 1304
1305 ITERATE_RDEV(mddev1,rdev,tmp)
7dd5e7c3
N		 1306 ITERATE_RDEV(mddev2, rdev2, tmp2)
1307 if (rdev->bdev->bd_contains ==
1308 rdev2->bdev->bd_contains)
1309 return 1;
1da177e4
LT		 1310
1311 return 0;
1312}
1313
1314static LIST_HEAD(pending_raid_disks);
1315
1316static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1317{
7dd5e7c3 1318 char b[BDEVNAME_SIZE];
f637b9f9 1319 struct kobject *ko;
1edf80d3 1320 char *s;
5e55e2f5 1321 int err;
1da177e4
LT		 1322
1323 if (rdev->mddev) {
1324 MD_BUG();
1325 return -EINVAL;
1326 }
2bf071bf
N		 1327 /* make sure rdev->size exceeds mddev->size */
1328 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1329 if (mddev->pers)
1330 /* Cannot change size, so fail */
1331 return -ENOSPC;
1332 else
1333 mddev->size = rdev->size;
1334 }
1da177e4
LT		 1335
1336 /* Verify rdev->desc_nr is unique.
1337 * If it is -1, assign a free number, else
1338 * check number is not in use
1339 */
1340 if (rdev->desc_nr < 0) {
1341 int choice = 0;
1342 if (mddev->pers) choice = mddev->raid_disks;
1343 while (find_rdev_nr(mddev, choice))
1344 choice++;
1345 rdev->desc_nr = choice;
1346 } else {
1347 if (find_rdev_nr(mddev, rdev->desc_nr))
1348 return -EBUSY;
1349 }
19133a42
N		 1350 bdevname(rdev->bdev,b);
1351 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1352 return -ENOMEM;
1edf80d3
NB		 1353 while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
1354 *s = '!';
1da177e4 1355
1da177e4 1356 rdev->mddev = mddev;
19133a42 1357 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 1358
9c791977 1359 rdev->kobj.parent = &mddev->kobj;
5e55e2f5
N		 1360 if ((err = kobject_add(&rdev->kobj)))
1361 goto fail;
86e6ffdd 1362
f637b9f9
N		 1363 if (rdev->bdev->bd_part)
1364 ko = &rdev->bdev->bd_part->kobj;
1365 else
1366 ko = &rdev->bdev->bd_disk->kobj;
5e55e2f5
N		 1367 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1368 kobject_del(&rdev->kobj);
1369 goto fail;
1370 }
1371 list_add(&rdev->same_set, &mddev->disks);
5463c790 1372 bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
1da177e4 1373 return 0;
5e55e2f5
N		 1374
1375 fail:
1376 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1377 b, mdname(mddev));
1378 return err;
1da177e4
LT		 1379}
1380
5792a285
N		 1381static void delayed_delete(struct work_struct *ws)
1382{
1383 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1384 kobject_del(&rdev->kobj);
1385}
1386
1da177e4
LT		 1387static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1388{
1389 char b[BDEVNAME_SIZE];
1390 if (!rdev->mddev) {
1391 MD_BUG();
1392 return;
1393 }
5463c790 1394 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1da177e4
LT		 1395 list_del_init(&rdev->same_set);
1396 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1397 rdev->mddev = NULL;
86e6ffdd 1398 sysfs_remove_link(&rdev->kobj, "block");
5792a285
N		 1399
1400 /* We need to delay this, otherwise we can deadlock when
1401 * writing to 'remove' to "dev/state"
1402 */
1403 INIT_WORK(&rdev->del_work, delayed_delete);
1404 schedule_work(&rdev->del_work);
1da177e4
LT		 1405}
1406
1407/*
1408 * prevent the device from being mounted, repartitioned or
1409 * otherwise reused by a RAID array (or any other kernel
1410 * subsystem), by bd_claiming the device.
1411 */
1412static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1413{
1414 int err = 0;
1415 struct block_device *bdev;
1416 char b[BDEVNAME_SIZE];
1417
2e7b651d 1418 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1da177e4
LT		 1419 if (IS_ERR(bdev)) {
1420 printk(KERN_ERR "md: could not open %s.\n",
1421 __bdevname(dev, b));
1422 return PTR_ERR(bdev);
1423 }
1424 err = bd_claim(bdev, rdev);
1425 if (err) {
1426 printk(KERN_ERR "md: could not bd_claim %s.\n",
1427 bdevname(bdev, b));
2e7b651d 1428 blkdev_put(bdev);
1da177e4
LT		 1429 return err;
1430 }
1431 rdev->bdev = bdev;
1432 return err;
1433}
1434
1435static void unlock_rdev(mdk_rdev_t *rdev)
1436{
1437 struct block_device *bdev = rdev->bdev;
1438 rdev->bdev = NULL;
1439 if (!bdev)
1440 MD_BUG();
1441 bd_release(bdev);
2e7b651d 1442 blkdev_put(bdev);
1da177e4
LT		 1443}
1444
1445void md_autodetect_dev(dev_t dev);
1446
1447static void export_rdev(mdk_rdev_t * rdev)
1448{
1449 char b[BDEVNAME_SIZE];
1450 printk(KERN_INFO "md: export_rdev(%s)\n",
1451 bdevname(rdev->bdev,b));
1452 if (rdev->mddev)
1453 MD_BUG();
1454 free_disk_sb(rdev);
1455 list_del_init(&rdev->same_set);
1456#ifndef MODULE
1457 md_autodetect_dev(rdev->bdev->bd_dev);
1458#endif
1459 unlock_rdev(rdev);
86e6ffdd 1460 kobject_put(&rdev->kobj);
1da177e4
LT		 1461}
1462
1463static void kick_rdev_from_array(mdk_rdev_t * rdev)
1464{
1465 unbind_rdev_from_array(rdev);
1466 export_rdev(rdev);
1467}
1468
1469static void export_array(mddev_t *mddev)
1470{
1471 struct list_head *tmp;
1472 mdk_rdev_t *rdev;
1473
1474 ITERATE_RDEV(mddev,rdev,tmp) {
1475 if (!rdev->mddev) {
1476 MD_BUG();
1477 continue;
1478 }
1479 kick_rdev_from_array(rdev);
1480 }
1481 if (!list_empty(&mddev->disks))
1482 MD_BUG();
1483 mddev->raid_disks = 0;
1484 mddev->major_version = 0;
1485}
1486
1487static void print_desc(mdp_disk_t *desc)
1488{
1489 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1490 desc->major,desc->minor,desc->raid_disk,desc->state);
1491}
1492
1493static void print_sb(mdp_super_t *sb)
1494{
1495 int i;
1496
1497 printk(KERN_INFO
1498 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1499 sb->major_version, sb->minor_version, sb->patch_version,
1500 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1501 sb->ctime);
1502 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1503 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1504 sb->md_minor, sb->layout, sb->chunk_size);
1505 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1506 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1507 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1508 sb->failed_disks, sb->spare_disks,
1509 sb->sb_csum, (unsigned long)sb->events_lo);
1510
1511 printk(KERN_INFO);
1512 for (i = 0; i < MD_SB_DISKS; i++) {
1513 mdp_disk_t *desc;
1514
1515 desc = sb->disks + i;
1516 if (desc->number || desc->major || desc->minor ||
1517 desc->raid_disk || (desc->state && (desc->state != 4))) {
1518 printk(" D %2d: ", i);
1519 print_desc(desc);
1520 }
1521 }
1522 printk(KERN_INFO "md: THIS: ");
1523 print_desc(&sb->this_disk);
1524
1525}
1526
1527static void print_rdev(mdk_rdev_t *rdev)
1528{
1529 char b[BDEVNAME_SIZE];
1530 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1531 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
b2d444d7
N		 1532 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1533 rdev->desc_nr);
1da177e4
LT		 1534 if (rdev->sb_loaded) {
1535 printk(KERN_INFO "md: rdev superblock:\n");
1536 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1537 } else
1538 printk(KERN_INFO "md: no rdev superblock!\n");
1539}
1540
5e56341d 1541static void md_print_devices(void)
1da177e4
LT		 1542{
1543 struct list_head *tmp, *tmp2;
1544 mdk_rdev_t *rdev;
1545 mddev_t *mddev;
1546 char b[BDEVNAME_SIZE];
1547
1548 printk("\n");
1549 printk("md: **********************************\n");
1550 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1551 printk("md: **********************************\n");
1552 ITERATE_MDDEV(mddev,tmp) {
1da177e4 1553
32a7627c
N		 1554 if (mddev->bitmap)
1555 bitmap_print_sb(mddev->bitmap);
1556 else
1557 printk("%s: ", mdname(mddev));
1da177e4
LT		 1558 ITERATE_RDEV(mddev,rdev,tmp2)
1559 printk("<%s>", bdevname(rdev->bdev,b));
1560 printk("\n");
1561
1562 ITERATE_RDEV(mddev,rdev,tmp2)
1563 print_rdev(rdev);
1564 }
1565 printk("md: **********************************\n");
1566 printk("\n");
1567}
1568
1569
42543769 1570static void sync_sbs(mddev_t * mddev, int nospares)
1da177e4 1571{
42543769
N		 1572 /* Update each superblock (in-memory image), but
1573 * if we are allowed to, skip spares which already
1574 * have the right event counter, or have one earlier
1575 * (which would mean they aren't being marked as dirty
1576 * with the rest of the array)
1577 */
1da177e4
LT		 1578 mdk_rdev_t *rdev;
1579 struct list_head *tmp;
1580
1581 ITERATE_RDEV(mddev,rdev,tmp) {
42543769
N		 1582 if (rdev->sb_events == mddev->events ||
1583 (nospares &&
1584 rdev->raid_disk < 0 &&
1585 (rdev->sb_events&1)==0 &&
1586 rdev->sb_events+1 == mddev->events)) {
1587 /* Don't update this superblock */
1588 rdev->sb_loaded = 2;
1589 } else {
1590 super_types[mddev->major_version].
1591 sync_super(mddev, rdev);
1592 rdev->sb_loaded = 1;
1593 }
1da177e4
LT		 1594 }
1595}
1596
850b2b42 1597static void md_update_sb(mddev_t * mddev, int force_change)
1da177e4 1598{
7bfa19f2 1599 int err;
1da177e4
LT		 1600 struct list_head *tmp;
1601 mdk_rdev_t *rdev;
06d91a5f 1602 int sync_req;
42543769 1603 int nospares = 0;
1da177e4 1604
1da177e4 1605repeat:
a9701a30 1606 spin_lock_irq(&mddev->write_lock);
84692195 1607
850b2b42
N		 1608 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1609 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1610 force_change = 1;
1611 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1612 /* just a clean<-> dirty transition, possibly leave spares alone,
1613 * though if events isn't the right even/odd, we will have to do
1614 * spares after all
1615 */
1616 nospares = 1;
1617 if (force_change)
1618 nospares = 0;
1619 if (mddev->degraded)
84692195
N		 1620 /* If the array is degraded, then skipping spares is both
1621 * dangerous and fairly pointless.
1622 * Dangerous because a device that was removed from the array
1623 * might have a event_count that still looks up-to-date,
1624 * so it can be re-added without a resync.
1625 * Pointless because if there are any spares to skip,
1626 * then a recovery will happen and soon that array won't
1627 * be degraded any more and the spare can go back to sleep then.
1628 */
850b2b42 1629 nospares = 0;
84692195 1630
06d91a5f 1631 sync_req = mddev->in_sync;
1da177e4 1632 mddev->utime = get_seconds();
42543769
N		 1633
1634 /* If this is just a dirty<->clean transition, and the array is clean
1635 * and 'events' is odd, we can roll back to the previous clean state */
850b2b42 1636 if (nospares
42543769 1637 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1031be7a
N		 1638 && (mddev->events & 1)
1639 && mddev->events != 1)
42543769
N		 1640 mddev->events--;
1641 else {
1642 /* otherwise we have to go forward and ... */
1643 mddev->events ++;
1644 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1645 /* .. if the array isn't clean, insist on an odd 'events' */
1646 if ((mddev->events&1)==0) {
1647 mddev->events++;
1648 nospares = 0;
1649 }
1650 } else {
1651 /* otherwise insist on an even 'events' (for clean states) */
1652 if ((mddev->events&1)) {
1653 mddev->events++;
1654 nospares = 0;
1655 }
1656 }
1657 }
1da177e4
LT		 1658
1659 if (!mddev->events) {
1660 /*
1661 * oops, this 64-bit counter should never wrap.
1662 * Either we are in around ~1 trillion A.C., assuming
1663 * 1 reboot per second, or we have a bug:
1664 */
1665 MD_BUG();
1666 mddev->events --;
1667 }
42543769 1668 sync_sbs(mddev, nospares);
1da177e4
LT		 1669
1670 /*
1671 * do not write anything to disk if using
1672 * nonpersistent superblocks
1673 */
06d91a5f 1674 if (!mddev->persistent) {
850b2b42 1675 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
a9701a30 1676 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1677 wake_up(&mddev->sb_wait);
1da177e4 1678 return;
06d91a5f 1679 }
a9701a30 1680 spin_unlock_irq(&mddev->write_lock);
1da177e4
LT		 1681
1682 dprintk(KERN_INFO
1683 "md: updating %s RAID superblock on device (in sync %d)\n",
1684 mdname(mddev),mddev->in_sync);
1685
32a7627c 1686 err = bitmap_update_sb(mddev->bitmap);
1da177e4
LT		 1687 ITERATE_RDEV(mddev,rdev,tmp) {
1688 char b[BDEVNAME_SIZE];
1689 dprintk(KERN_INFO "md: ");
42543769
N		 1690 if (rdev->sb_loaded != 1)
1691 continue; /* no noise on spare devices */
b2d444d7 1692 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1693 dprintk("(skipping faulty ");
1694
1695 dprintk("%s ", bdevname(rdev->bdev,b));
b2d444d7 1696 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 1697 md_super_write(mddev,rdev,
0002b271 1698 rdev->sb_offset<<1, rdev->sb_size,
7bfa19f2
N		 1699 rdev->sb_page);
1700 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1701 bdevname(rdev->bdev,b),
1702 (unsigned long long)rdev->sb_offset);
42543769 1703 rdev->sb_events = mddev->events;
7bfa19f2 1704
1da177e4
LT		 1705 } else
1706 dprintk(")\n");
7bfa19f2 1707 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT		 1708 /* only need to write one superblock... */
1709 break;
1710 }
a9701a30 1711 md_super_wait(mddev);
850b2b42 1712 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
7bfa19f2 1713
a9701a30 1714 spin_lock_irq(&mddev->write_lock);
850b2b42
N		 1715 if (mddev->in_sync != sync_req ||
1716 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
06d91a5f 1717 /* have to write it out again */
a9701a30 1718 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N		 1719 goto repeat;
1720 }
850b2b42 1721 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
a9701a30 1722 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1723 wake_up(&mddev->sb_wait);
06d91a5f 1724
1da177e4
LT		 1725}
1726
bce74dac
N		 1727/* words written to sysfs files may, or my not, be \n terminated.
1728 * We want to accept with case. For this we use cmd_match.
1729 */
1730static int cmd_match(const char *cmd, const char *str)
1731{
1732 /* See if cmd, written into a sysfs file, matches
1733 * str. They must either be the same, or cmd can
1734 * have a trailing newline
1735 */
1736 while (*cmd && *str && *cmd == *str) {
1737 cmd++;
1738 str++;
1739 }
1740 if (*cmd == '\n')
1741 cmd++;
1742 if (*str || *cmd)
1743 return 0;
1744 return 1;
1745}
1746
86e6ffdd
N		 1747struct rdev_sysfs_entry {
1748 struct attribute attr;
1749 ssize_t (*show)(mdk_rdev_t *, char *);
1750 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1751};
1752
1753static ssize_t
96de1e66 1754state_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1755{
1756 char *sep = "";
1757 int len=0;
1758
b2d444d7 1759 if (test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 1760 len+= sprintf(page+len, "%sfaulty",sep);
1761 sep = ",";
1762 }
b2d444d7 1763 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1764 len += sprintf(page+len, "%sin_sync",sep);
1765 sep = ",";
1766 }
f655675b
N		 1767 if (test_bit(WriteMostly, &rdev->flags)) {
1768 len += sprintf(page+len, "%swrite_mostly",sep);
1769 sep = ",";
1770 }
b2d444d7
N		 1771 if (!test_bit(Faulty, &rdev->flags) &&
1772 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1773 len += sprintf(page+len, "%sspare", sep);
1774 sep = ",";
1775 }
1776 return len+sprintf(page+len, "\n");
1777}
1778
45dc2de1
N		 1779static ssize_t
1780state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1781{
1782 /* can write
1783 * faulty - simulates and error
1784 * remove - disconnects the device
f655675b
N		 1785 * writemostly - sets write_mostly
1786 * -writemostly - clears write_mostly
45dc2de1
N		 1787 */
1788 int err = -EINVAL;
1789 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1790 md_error(rdev->mddev, rdev);
1791 err = 0;
1792 } else if (cmd_match(buf, "remove")) {
1793 if (rdev->raid_disk >= 0)
1794 err = -EBUSY;
1795 else {
1796 mddev_t *mddev = rdev->mddev;
1797 kick_rdev_from_array(rdev);
3f9d7b0d
N		 1798 if (mddev->pers)
1799 md_update_sb(mddev, 1);
45dc2de1
N		 1800 md_new_event(mddev);
1801 err = 0;
1802 }
f655675b
N		 1803 } else if (cmd_match(buf, "writemostly")) {
1804 set_bit(WriteMostly, &rdev->flags);
1805 err = 0;
1806 } else if (cmd_match(buf, "-writemostly")) {
1807 clear_bit(WriteMostly, &rdev->flags);
1808 err = 0;
45dc2de1
N		 1809 }
1810 return err ? err : len;
1811}
80ca3a44
N		 1812static struct rdev_sysfs_entry rdev_state =
1813__ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
86e6ffdd
N		 1814
1815static ssize_t
96de1e66 1816super_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1817{
1818 if (rdev->sb_loaded && rdev->sb_size) {
1819 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1820 return rdev->sb_size;
1821 } else
1822 return 0;
1823}
96de1e66
N		 1824static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1825
4dbcdc75
N		 1826static ssize_t
1827errors_show(mdk_rdev_t *rdev, char *page)
1828{
1829 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1830}
1831
1832static ssize_t
1833errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1834{
1835 char *e;
1836 unsigned long n = simple_strtoul(buf, &e, 10);
1837 if (*buf && (*e == 0 || *e == '\n')) {
1838 atomic_set(&rdev->corrected_errors, n);
1839 return len;
1840 }
1841 return -EINVAL;
1842}
1843static struct rdev_sysfs_entry rdev_errors =
80ca3a44 1844__ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
4dbcdc75 1845
014236d2
N		 1846static ssize_t
1847slot_show(mdk_rdev_t *rdev, char *page)
1848{
1849 if (rdev->raid_disk < 0)
1850 return sprintf(page, "none\n");
1851 else
1852 return sprintf(page, "%d\n", rdev->raid_disk);
1853}
1854
1855static ssize_t
1856slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1857{
1858 char *e;
1859 int slot = simple_strtoul(buf, &e, 10);
1860 if (strncmp(buf, "none", 4)==0)
1861 slot = -1;
1862 else if (e==buf || (*e && *e!= '\n'))
1863 return -EINVAL;
1864 if (rdev->mddev->pers)
1865 /* Cannot set slot in active array (yet) */
1866 return -EBUSY;
1867 if (slot >= rdev->mddev->raid_disks)
1868 return -ENOSPC;
1869 rdev->raid_disk = slot;
1870 /* assume it is working */
1871 rdev->flags = 0;
1872 set_bit(In_sync, &rdev->flags);
1873 return len;
1874}
1875
1876
1877static struct rdev_sysfs_entry rdev_slot =
80ca3a44 1878__ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
014236d2 1879
93c8cad0
N		 1880static ssize_t
1881offset_show(mdk_rdev_t *rdev, char *page)
1882{
6961ece4 1883 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
93c8cad0
N		 1884}
1885
1886static ssize_t
1887offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1888{
1889 char *e;
1890 unsigned long long offset = simple_strtoull(buf, &e, 10);
1891 if (e==buf || (*e && *e != '\n'))
1892 return -EINVAL;
1893 if (rdev->mddev->pers)
1894 return -EBUSY;
1895 rdev->data_offset = offset;
1896 return len;
1897}
1898
1899static struct rdev_sysfs_entry rdev_offset =
80ca3a44 1900__ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
93c8cad0 1901
83303b61
N		 1902static ssize_t
1903rdev_size_show(mdk_rdev_t *rdev, char *page)
1904{
1905 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1906}
1907
1908static ssize_t
1909rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1910{
1911 char *e;
1912 unsigned long long size = simple_strtoull(buf, &e, 10);
1913 if (e==buf || (*e && *e != '\n'))
1914 return -EINVAL;
1915 if (rdev->mddev->pers)
1916 return -EBUSY;
1917 rdev->size = size;
1918 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1919 rdev->mddev->size = size;
1920 return len;
1921}
1922
1923static struct rdev_sysfs_entry rdev_size =
80ca3a44 1924__ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
83303b61 1925
86e6ffdd
N		 1926static struct attribute *rdev_default_attrs[] = {
1927 &rdev_state.attr,
1928 &rdev_super.attr,
4dbcdc75 1929 &rdev_errors.attr,
014236d2 1930 &rdev_slot.attr,
93c8cad0 1931 &rdev_offset.attr,
83303b61 1932 &rdev_size.attr,
86e6ffdd
N		 1933 NULL,
1934};
1935static ssize_t
1936rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1937{
1938 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1939 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1940
1941 if (!entry->show)
1942 return -EIO;
1943 return entry->show(rdev, page);
1944}
1945
1946static ssize_t
1947rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1948 const char *page, size_t length)
1949{
1950 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1951 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1952
1953 if (!entry->store)
1954 return -EIO;
67463acb
N		 1955 if (!capable(CAP_SYS_ADMIN))
1956 return -EACCES;
86e6ffdd
N		 1957 return entry->store(rdev, page, length);
1958}
1959
1960static void rdev_free(struct kobject *ko)
1961{
1962 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1963 kfree(rdev);
1964}
1965static struct sysfs_ops rdev_sysfs_ops = {
1966 .show = rdev_attr_show,
1967 .store = rdev_attr_store,
1968};
1969static struct kobj_type rdev_ktype = {
1970 .release = rdev_free,
1971 .sysfs_ops = &rdev_sysfs_ops,
1972 .default_attrs = rdev_default_attrs,
1973};
1974
1da177e4
LT		 1975/*
1976 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1977 *
1978 * mark the device faulty if:
1979 *
1980 * - the device is nonexistent (zero size)
1981 * - the device has no valid superblock
1982 *
1983 * a faulty rdev _never_ has rdev->sb set.
1984 */
1985static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1986{
1987 char b[BDEVNAME_SIZE];
1988 int err;
1989 mdk_rdev_t *rdev;
1990 sector_t size;
1991
9ffae0cf 1992 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1da177e4
LT		 1993 if (!rdev) {
1994 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1995 return ERR_PTR(-ENOMEM);
1996 }
1da177e4
LT		 1997
1998 if ((err = alloc_disk_sb(rdev)))
1999 goto abort_free;
2000
2001 err = lock_rdev(rdev, newdev);
2002 if (err)
2003 goto abort_free;
2004
86e6ffdd
N		 2005 rdev->kobj.parent = NULL;
2006 rdev->kobj.ktype = &rdev_ktype;
2007 kobject_init(&rdev->kobj);
2008
1da177e4 2009 rdev->desc_nr = -1;
2b6e8459 2010 rdev->saved_raid_disk = -1;
3f9d7b0d 2011 rdev->raid_disk = -1;
b2d444d7 2012 rdev->flags = 0;
1da177e4 2013 rdev->data_offset = 0;
42543769 2014 rdev->sb_events = 0;
1da177e4 2015 atomic_set(&rdev->nr_pending, 0);
ba22dcbf 2016 atomic_set(&rdev->read_errors, 0);
4dbcdc75 2017 atomic_set(&rdev->corrected_errors, 0);
1da177e4
LT		 2018
2019 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2020 if (!size) {
2021 printk(KERN_WARNING
2022 "md: %s has zero or unknown size, marking faulty!\n",
2023 bdevname(rdev->bdev,b));
2024 err = -EINVAL;
2025 goto abort_free;
2026 }
2027
2028 if (super_format >= 0) {
2029 err = super_types[super_format].
2030 load_super(rdev, NULL, super_minor);
2031 if (err == -EINVAL) {
2032 printk(KERN_WARNING
2033 "md: %s has invalid sb, not importing!\n",
2034 bdevname(rdev->bdev,b));
2035 goto abort_free;
2036 }
2037 if (err < 0) {
2038 printk(KERN_WARNING
2039 "md: could not read %s's sb, not importing!\n",
2040 bdevname(rdev->bdev,b));
2041 goto abort_free;
2042 }
2043 }
2044 INIT_LIST_HEAD(&rdev->same_set);
2045
2046 return rdev;
2047
2048abort_free:
2049 if (rdev->sb_page) {
2050 if (rdev->bdev)
2051 unlock_rdev(rdev);
2052 free_disk_sb(rdev);
2053 }
2054 kfree(rdev);
2055 return ERR_PTR(err);
2056}
2057
2058/*
2059 * Check a full RAID array for plausibility
2060 */
2061
2062
a757e64c 2063static void analyze_sbs(mddev_t * mddev)
1da177e4
LT		 2064{
2065 int i;
2066 struct list_head *tmp;
2067 mdk_rdev_t *rdev, *freshest;
2068 char b[BDEVNAME_SIZE];
2069
2070 freshest = NULL;
2071 ITERATE_RDEV(mddev,rdev,tmp)
2072 switch (super_types[mddev->major_version].
2073 load_super(rdev, freshest, mddev->minor_version)) {
2074 case 1:
2075 freshest = rdev;
2076 break;
2077 case 0:
2078 break;
2079 default:
2080 printk( KERN_ERR \
2081 "md: fatal superblock inconsistency in %s"
2082 " -- removing from array\n",
2083 bdevname(rdev->bdev,b));
2084 kick_rdev_from_array(rdev);
2085 }
2086
2087
2088 super_types[mddev->major_version].
2089 validate_super(mddev, freshest);
2090
2091 i = 0;
2092 ITERATE_RDEV(mddev,rdev,tmp) {
2093 if (rdev != freshest)
2094 if (super_types[mddev->major_version].
2095 validate_super(mddev, rdev)) {
2096 printk(KERN_WARNING "md: kicking non-fresh %s"
2097 " from array!\n",
2098 bdevname(rdev->bdev,b));
2099 kick_rdev_from_array(rdev);
2100 continue;
2101 }
2102 if (mddev->level == LEVEL_MULTIPATH) {
2103 rdev->desc_nr = i++;
2104 rdev->raid_disk = rdev->desc_nr;
b2d444d7 2105 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 2106 }
2107 }
2108
2109
2110
2111 if (mddev->recovery_cp != MaxSector &&
2112 mddev->level >= 1)
2113 printk(KERN_ERR "md: %s: raid array is not clean"
2114 " -- starting background reconstruction\n",
2115 mdname(mddev));
2116
1da177e4
LT		 2117}
2118
16f17b39
N		 2119static ssize_t
2120safe_delay_show(mddev_t *mddev, char *page)
2121{
2122 int msec = (mddev->safemode_delay*1000)/HZ;
2123 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2124}
2125static ssize_t
2126safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2127{
2128 int scale=1;
2129 int dot=0;
2130 int i;
2131 unsigned long msec;
2132 char buf[30];
2133 char *e;
2134 /* remove a period, and count digits after it */
2135 if (len >= sizeof(buf))
2136 return -EINVAL;
2137 strlcpy(buf, cbuf, len);
2138 buf[len] = 0;
2139 for (i=0; i<len; i++) {
2140 if (dot) {
2141 if (isdigit(buf[i])) {
2142 buf[i-1] = buf[i];
2143 scale *= 10;
2144 }
2145 buf[i] = 0;
2146 } else if (buf[i] == '.') {
2147 dot=1;
2148 buf[i] = 0;
2149 }
2150 }
2151 msec = simple_strtoul(buf, &e, 10);
2152 if (e == buf || (*e && *e != '\n'))
2153 return -EINVAL;
2154 msec = (msec * 1000) / scale;
2155 if (msec == 0)
2156 mddev->safemode_delay = 0;
2157 else {
2158 mddev->safemode_delay = (msec*HZ)/1000;
2159 if (mddev->safemode_delay == 0)
2160 mddev->safemode_delay = 1;
2161 }
2162 return len;
2163}
2164static struct md_sysfs_entry md_safe_delay =
80ca3a44 2165__ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
16f17b39 2166
eae1701f 2167static ssize_t
96de1e66 2168level_show(mddev_t *mddev, char *page)
eae1701f 2169{
2604b703 2170 struct mdk_personality *p = mddev->pers;
d9d166c2 2171 if (p)
eae1701f 2172 return sprintf(page, "%s\n", p->name);
d9d166c2
N		 2173 else if (mddev->clevel[0])
2174 return sprintf(page, "%s\n", mddev->clevel);
2175 else if (mddev->level != LEVEL_NONE)
2176 return sprintf(page, "%d\n", mddev->level);
2177 else
2178 return 0;
eae1701f
N		 2179}
2180
d9d166c2
N		 2181static ssize_t
2182level_store(mddev_t *mddev, const char *buf, size_t len)
2183{
2184 int rv = len;
2185 if (mddev->pers)
2186 return -EBUSY;
2187 if (len == 0)
2188 return 0;
2189 if (len >= sizeof(mddev->clevel))
2190 return -ENOSPC;
2191 strncpy(mddev->clevel, buf, len);
2192 if (mddev->clevel[len-1] == '\n')
2193 len--;
2194 mddev->clevel[len] = 0;
2195 mddev->level = LEVEL_NONE;
2196 return rv;
2197}
2198
2199static struct md_sysfs_entry md_level =
80ca3a44 2200__ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
eae1701f 2201
d4dbd025
N		 2202
2203static ssize_t
2204layout_show(mddev_t *mddev, char *page)
2205{
2206 /* just a number, not meaningful for all levels */
2207 return sprintf(page, "%d\n", mddev->layout);
2208}
2209
2210static ssize_t
2211layout_store(mddev_t *mddev, const char *buf, size_t len)
2212{
2213 char *e;
2214 unsigned long n = simple_strtoul(buf, &e, 10);
2215 if (mddev->pers)
2216 return -EBUSY;
2217
2218 if (!*buf || (*e && *e != '\n'))
2219 return -EINVAL;
2220
2221 mddev->layout = n;
2222 return len;
2223}
2224static struct md_sysfs_entry md_layout =
80ca3a44 2225__ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
d4dbd025
N		 2226
2227
eae1701f 2228static ssize_t
96de1e66 2229raid_disks_show(mddev_t *mddev, char *page)
eae1701f 2230{
bb636547
N		 2231 if (mddev->raid_disks == 0)
2232 return 0;
eae1701f
N		 2233 return sprintf(page, "%d\n", mddev->raid_disks);
2234}
2235
da943b99
N		 2236static int update_raid_disks(mddev_t *mddev, int raid_disks);
2237
2238static ssize_t
2239raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2240{
da943b99
N		 2241 char *e;
2242 int rv = 0;
2243 unsigned long n = simple_strtoul(buf, &e, 10);
2244
2245 if (!*buf || (*e && *e != '\n'))
2246 return -EINVAL;
2247
2248 if (mddev->pers)
2249 rv = update_raid_disks(mddev, n);
2250 else
2251 mddev->raid_disks = n;
2252 return rv ? rv : len;
2253}
2254static struct md_sysfs_entry md_raid_disks =
80ca3a44 2255__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
eae1701f 2256
3b34380a
N		 2257static ssize_t
2258chunk_size_show(mddev_t *mddev, char *page)
2259{
2260 return sprintf(page, "%d\n", mddev->chunk_size);
2261}
2262
2263static ssize_t
2264chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2265{
2266 /* can only set chunk_size if array is not yet active */
2267 char *e;
2268 unsigned long n = simple_strtoul(buf, &e, 10);
2269
2270 if (mddev->pers)
2271 return -EBUSY;
2272 if (!*buf || (*e && *e != '\n'))
2273 return -EINVAL;
2274
2275 mddev->chunk_size = n;
2276 return len;
2277}
2278static struct md_sysfs_entry md_chunk_size =
80ca3a44 2279__ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3b34380a 2280
a94213b1
N		 2281static ssize_t
2282resync_start_show(mddev_t *mddev, char *page)
2283{
2284 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2285}
2286
2287static ssize_t
2288resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2289{
2290 /* can only set chunk_size if array is not yet active */
2291 char *e;
2292 unsigned long long n = simple_strtoull(buf, &e, 10);
2293
2294 if (mddev->pers)
2295 return -EBUSY;
2296 if (!*buf || (*e && *e != '\n'))
2297 return -EINVAL;
2298
2299 mddev->recovery_cp = n;
2300 return len;
2301}
2302static struct md_sysfs_entry md_resync_start =
80ca3a44 2303__ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
a94213b1 2304
9e653b63
N		 2305/*
2306 * The array state can be:
2307 *
2308 * clear
2309 * No devices, no size, no level
2310 * Equivalent to STOP_ARRAY ioctl
2311 * inactive
2312 * May have some settings, but array is not active
2313 * all IO results in error
2314 * When written, doesn't tear down array, but just stops it
2315 * suspended (not supported yet)
2316 * All IO requests will block. The array can be reconfigured.
2317 * Writing this, if accepted, will block until array is quiessent
2318 * readonly
2319 * no resync can happen. no superblocks get written.
2320 * write requests fail
2321 * read-auto
2322 * like readonly, but behaves like 'clean' on a write request.
2323 *
2324 * clean - no pending writes, but otherwise active.
2325 * When written to inactive array, starts without resync
2326 * If a write request arrives then
2327 * if metadata is known, mark 'dirty' and switch to 'active'.
2328 * if not known, block and switch to write-pending
2329 * If written to an active array that has pending writes, then fails.
2330 * active
2331 * fully active: IO and resync can be happening.
2332 * When written to inactive array, starts with resync
2333 *
2334 * write-pending
2335 * clean, but writes are blocked waiting for 'active' to be written.
2336 *
2337 * active-idle
2338 * like active, but no writes have been seen for a while (100msec).
2339 *
2340 */
2341enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2342 write_pending, active_idle, bad_word};
05381954 2343static char *array_states[] = {
9e653b63
N		 2344 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2345 "write-pending", "active-idle", NULL };
2346
2347static int match_word(const char *word, char **list)
2348{
2349 int n;
2350 for (n=0; list[n]; n++)
2351 if (cmd_match(word, list[n]))
2352 break;
2353 return n;
2354}
2355
2356static ssize_t
2357array_state_show(mddev_t *mddev, char *page)
2358{
2359 enum array_state st = inactive;
2360
2361 if (mddev->pers)
2362 switch(mddev->ro) {
2363 case 1:
2364 st = readonly;
2365 break;
2366 case 2:
2367 st = read_auto;
2368 break;
2369 case 0:
2370 if (mddev->in_sync)
2371 st = clean;
2372 else if (mddev->safemode)
2373 st = active_idle;
2374 else
2375 st = active;
2376 }
2377 else {
2378 if (list_empty(&mddev->disks) &&
2379 mddev->raid_disks == 0 &&
2380 mddev->size == 0)
2381 st = clear;
2382 else
2383 st = inactive;
2384 }
2385 return sprintf(page, "%s\n", array_states[st]);
2386}
2387
2388static int do_md_stop(mddev_t * mddev, int ro);
2389static int do_md_run(mddev_t * mddev);
2390static int restart_array(mddev_t *mddev);
2391
2392static ssize_t
2393array_state_store(mddev_t *mddev, const char *buf, size_t len)
2394{
2395 int err = -EINVAL;
2396 enum array_state st = match_word(buf, array_states);
2397 switch(st) {
2398 case bad_word:
2399 break;
2400 case clear:
2401 /* stopping an active array */
2402 if (mddev->pers) {
2403 if (atomic_read(&mddev->active) > 1)
2404 return -EBUSY;
2405 err = do_md_stop(mddev, 0);
2406 }
2407 break;
2408 case inactive:
2409 /* stopping an active array */
2410 if (mddev->pers) {
2411 if (atomic_read(&mddev->active) > 1)
2412 return -EBUSY;
2413 err = do_md_stop(mddev, 2);
2414 }
2415 break;
2416 case suspended:
2417 break; /* not supported yet */
2418 case readonly:
2419 if (mddev->pers)
2420 err = do_md_stop(mddev, 1);
2421 else {
2422 mddev->ro = 1;
2423 err = do_md_run(mddev);
2424 }
2425 break;
2426 case read_auto:
2427 /* stopping an active array */
2428 if (mddev->pers) {
2429 err = do_md_stop(mddev, 1);
2430 if (err == 0)
2431 mddev->ro = 2; /* FIXME mark devices writable */
2432 } else {
2433 mddev->ro = 2;
2434 err = do_md_run(mddev);
2435 }
2436 break;
2437 case clean:
2438 if (mddev->pers) {
2439 restart_array(mddev);
2440 spin_lock_irq(&mddev->write_lock);
2441 if (atomic_read(&mddev->writes_pending) == 0) {
2442 mddev->in_sync = 1;
850b2b42 2443 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
9e653b63
N		 2444 }
2445 spin_unlock_irq(&mddev->write_lock);
2446 } else {
2447 mddev->ro = 0;
2448 mddev->recovery_cp = MaxSector;
2449 err = do_md_run(mddev);
2450 }
2451 break;
2452 case active:
2453 if (mddev->pers) {
2454 restart_array(mddev);
850b2b42 2455 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
9e653b63
N		 2456 wake_up(&mddev->sb_wait);
2457 err = 0;
2458 } else {
2459 mddev->ro = 0;
2460 err = do_md_run(mddev);
2461 }
2462 break;
2463 case write_pending:
2464 case active_idle:
2465 /* these cannot be set */
2466 break;
2467 }
2468 if (err)
2469 return err;
2470 else
2471 return len;
2472}
80ca3a44
N		 2473static struct md_sysfs_entry md_array_state =
2474__ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
9e653b63 2475
6d7ff738
N		 2476static ssize_t
2477null_show(mddev_t *mddev, char *page)
2478{
2479 return -EINVAL;
2480}
2481
2482static ssize_t
2483new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2484{
2485 /* buf must be %d:%d\n? giving major and minor numbers */
2486 /* The new device is added to the array.
2487 * If the array has a persistent superblock, we read the
2488 * superblock to initialise info and check validity.
2489 * Otherwise, only checking done is that in bind_rdev_to_array,
2490 * which mainly checks size.
2491 */
2492 char *e;
2493 int major = simple_strtoul(buf, &e, 10);
2494 int minor;
2495 dev_t dev;
2496 mdk_rdev_t *rdev;
2497 int err;
2498
2499 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2500 return -EINVAL;
2501 minor = simple_strtoul(e+1, &e, 10);
2502 if (*e && *e != '\n')
2503 return -EINVAL;
2504 dev = MKDEV(major, minor);
2505 if (major != MAJOR(dev) ||
2506 minor != MINOR(dev))
2507 return -EOVERFLOW;
2508
2509
2510 if (mddev->persistent) {
2511 rdev = md_import_device(dev, mddev->major_version,
2512 mddev->minor_version);
2513 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2514 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2515 mdk_rdev_t, same_set);
2516 err = super_types[mddev->major_version]
2517 .load_super(rdev, rdev0, mddev->minor_version);
2518 if (err < 0)
2519 goto out;
2520 }
2521 } else
2522 rdev = md_import_device(dev, -1, -1);
2523
2524 if (IS_ERR(rdev))
2525 return PTR_ERR(rdev);
2526 err = bind_rdev_to_array(rdev, mddev);
2527 out:
2528 if (err)
2529 export_rdev(rdev);
2530 return err ? err : len;
2531}
2532
2533static struct md_sysfs_entry md_new_device =
80ca3a44 2534__ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3b34380a 2535
9b1d1dac
PC		 2536static ssize_t
2537bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2538{
2539 char *end;
2540 unsigned long chunk, end_chunk;
2541
2542 if (!mddev->bitmap)
2543 goto out;
2544 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2545 while (*buf) {
2546 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2547 if (buf == end) break;
2548 if (*end == '-') { /* range */
2549 buf = end + 1;
2550 end_chunk = simple_strtoul(buf, &end, 0);
2551 if (buf == end) break;
2552 }
2553 if (*end && !isspace(*end)) break;
2554 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2555 buf = end;
2556 while (isspace(*buf)) buf++;
2557 }
2558 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2559out:
2560 return len;
2561}
2562
2563static struct md_sysfs_entry md_bitmap =
2564__ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2565
a35b0d69
N		 2566static ssize_t
2567size_show(mddev_t *mddev, char *page)
2568{
2569 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2570}
2571
2572static int update_size(mddev_t *mddev, unsigned long size);
2573
2574static ssize_t
2575size_store(mddev_t *mddev, const char *buf, size_t len)
2576{
2577 /* If array is inactive, we can reduce the component size, but
2578 * not increase it (except from 0).
2579 * If array is active, we can try an on-line resize
2580 */
2581 char *e;
2582 int err = 0;
2583 unsigned long long size = simple_strtoull(buf, &e, 10);
2584 if (!*buf || *buf == '\n' ||
2585 (*e && *e != '\n'))
2586 return -EINVAL;
2587
2588 if (mddev->pers) {
2589 err = update_size(mddev, size);
850b2b42 2590 md_update_sb(mddev, 1);
a35b0d69
N		 2591 } else {
2592 if (mddev->size == 0 ||
2593 mddev->size > size)
2594 mddev->size = size;
2595 else
2596 err = -ENOSPC;
2597 }
2598 return err ? err : len;
2599}
2600
2601static struct md_sysfs_entry md_size =
80ca3a44 2602__ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
a35b0d69 2603
8bb93aac
N		 2604
2605/* Metdata version.
2606 * This is either 'none' for arrays with externally managed metadata,
2607 * or N.M for internally known formats
2608 */
2609static ssize_t
2610metadata_show(mddev_t *mddev, char *page)
2611{
2612 if (mddev->persistent)
2613 return sprintf(page, "%d.%d\n",
2614 mddev->major_version, mddev->minor_version);
2615 else
2616 return sprintf(page, "none\n");
2617}
2618
2619static ssize_t
2620metadata_store(mddev_t *mddev, const char *buf, size_t len)
2621{
2622 int major, minor;
2623 char *e;
2624 if (!list_empty(&mddev->disks))
2625 return -EBUSY;
2626
2627 if (cmd_match(buf, "none")) {
2628 mddev->persistent = 0;
2629 mddev->major_version = 0;
2630 mddev->minor_version = 90;
2631 return len;
2632 }
2633 major = simple_strtoul(buf, &e, 10);
2634 if (e==buf || *e != '.')
2635 return -EINVAL;
2636 buf = e+1;
2637 minor = simple_strtoul(buf, &e, 10);
3f9d7b0d 2638 if (e==buf || (*e && *e != '\n') )
8bb93aac
N		 2639 return -EINVAL;
2640 if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
2641 super_types[major].name == NULL)
2642 return -ENOENT;
2643 mddev->major_version = major;
2644 mddev->minor_version = minor;
2645 mddev->persistent = 1;
2646 return len;
2647}
2648
2649static struct md_sysfs_entry md_metadata =
80ca3a44 2650__ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
8bb93aac 2651
24dd469d 2652static ssize_t
7eec314d 2653action_show(mddev_t *mddev, char *page)
24dd469d 2654{
7eec314d 2655 char *type = "idle";
31399d9e
N		 2656 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2657 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
ccfcc3c1
N		 2658 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2659 type = "reshape";
2660 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N		 2661 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2662 type = "resync";
2663 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2664 type = "check";
2665 else
2666 type = "repair";
2667 } else
2668 type = "recover";
2669 }
2670 return sprintf(page, "%s\n", type);
2671}
2672
2673static ssize_t
7eec314d 2674action_store(mddev_t *mddev, const char *page, size_t len)
24dd469d 2675{
7eec314d
N		 2676 if (!mddev->pers || !mddev->pers->sync_request)
2677 return -EINVAL;
2678
bce74dac 2679 if (cmd_match(page, "idle")) {
7eec314d
N		 2680 if (mddev->sync_thread) {
2681 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2682 md_unregister_thread(mddev->sync_thread);
2683 mddev->sync_thread = NULL;
2684 mddev->recovery = 0;
2685 }
03c902e1
N		 2686 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2687 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 2688 return -EBUSY;
03c902e1 2689 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
7eec314d 2690 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
16484bf5
N		 2691 else if (cmd_match(page, "reshape")) {
2692 int err;
2693 if (mddev->pers->start_reshape == NULL)
2694 return -EINVAL;
2695 err = mddev->pers->start_reshape(mddev);
2696 if (err)
2697 return err;
2698 } else {
bce74dac 2699 if (cmd_match(page, "check"))
7eec314d 2700 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2adc7d47 2701 else if (!cmd_match(page, "repair"))
7eec314d
N		 2702 return -EINVAL;
2703 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2704 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7eec314d 2705 }
03c902e1 2706 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d
N		 2707 md_wakeup_thread(mddev->thread);
2708 return len;
2709}
2710
9d88883e 2711static ssize_t
96de1e66 2712mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 2713{
2714 return sprintf(page, "%llu\n",
2715 (unsigned long long) mddev->resync_mismatches);
2716}
2717
80ca3a44
N		 2718static struct md_sysfs_entry md_scan_mode =
2719__ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 2720
96de1e66 2721
80ca3a44 2722static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 2723
88202a0c
N		 2724static ssize_t
2725sync_min_show(mddev_t *mddev, char *page)
2726{
2727 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2728 mddev->sync_speed_min ? "local": "system");
2729}
2730
2731static ssize_t
2732sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2733{
2734 int min;
2735 char *e;
2736 if (strncmp(buf, "system", 6)==0) {
2737 mddev->sync_speed_min = 0;
2738 return len;
2739 }
2740 min = simple_strtoul(buf, &e, 10);
2741 if (buf == e || (*e && *e != '\n') || min <= 0)
2742 return -EINVAL;
2743 mddev->sync_speed_min = min;
2744 return len;
2745}
2746
2747static struct md_sysfs_entry md_sync_min =
2748__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2749
2750static ssize_t
2751sync_max_show(mddev_t *mddev, char *page)
2752{
2753 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2754 mddev->sync_speed_max ? "local": "system");
2755}
2756
2757static ssize_t
2758sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2759{
2760 int max;
2761 char *e;
2762 if (strncmp(buf, "system", 6)==0) {
2763 mddev->sync_speed_max = 0;
2764 return len;
2765 }
2766 max = simple_strtoul(buf, &e, 10);
2767 if (buf == e || (*e && *e != '\n') || max <= 0)
2768 return -EINVAL;
2769 mddev->sync_speed_max = max;
2770 return len;
2771}
2772
2773static struct md_sysfs_entry md_sync_max =
2774__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2775
2776
2777static ssize_t
2778sync_speed_show(mddev_t *mddev, char *page)
2779{
2780 unsigned long resync, dt, db;
ff4e8d9a 2781 resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active));
88202a0c
N		 2782 dt = ((jiffies - mddev->resync_mark) / HZ);
2783 if (!dt) dt++;
2784 db = resync - (mddev->resync_mark_cnt);
2785 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2786}
2787
80ca3a44 2788static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
88202a0c
N		 2789
2790static ssize_t
2791sync_completed_show(mddev_t *mddev, char *page)
2792{
2793 unsigned long max_blocks, resync;
2794
2795 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2796 max_blocks = mddev->resync_max_sectors;
2797 else
2798 max_blocks = mddev->size << 1;
2799
2800 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2801 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2802}
2803
80ca3a44 2804static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
88202a0c 2805
e464eafd
N		 2806static ssize_t
2807suspend_lo_show(mddev_t *mddev, char *page)
2808{
2809 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
2810}
2811
2812static ssize_t
2813suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
2814{
2815 char *e;
2816 unsigned long long new = simple_strtoull(buf, &e, 10);
2817
2818 if (mddev->pers->quiesce == NULL)
2819 return -EINVAL;
2820 if (buf == e || (*e && *e != '\n'))
2821 return -EINVAL;
2822 if (new >= mddev->suspend_hi ||
2823 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
2824 mddev->suspend_lo = new;
2825 mddev->pers->quiesce(mddev, 2);
2826 return len;
2827 } else
2828 return -EINVAL;
2829}
2830static struct md_sysfs_entry md_suspend_lo =
2831__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
2832
2833
2834static ssize_t
2835suspend_hi_show(mddev_t *mddev, char *page)
2836{
2837 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
2838}
2839
2840static ssize_t
2841suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
2842{
2843 char *e;
2844 unsigned long long new = simple_strtoull(buf, &e, 10);
2845
2846 if (mddev->pers->quiesce == NULL)
2847 return -EINVAL;
2848 if (buf == e || (*e && *e != '\n'))
2849 return -EINVAL;
2850 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
2851 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
2852 mddev->suspend_hi = new;
2853 mddev->pers->quiesce(mddev, 1);
2854 mddev->pers->quiesce(mddev, 0);
2855 return len;
2856 } else
2857 return -EINVAL;
2858}
2859static struct md_sysfs_entry md_suspend_hi =
2860__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
2861
2862
eae1701f
N		 2863static struct attribute *md_default_attrs[] = {
2864 &md_level.attr,
d4dbd025 2865 &md_layout.attr,
eae1701f 2866 &md_raid_disks.attr,
3b34380a 2867 &md_chunk_size.attr,
a35b0d69 2868 &md_size.attr,
a94213b1 2869 &md_resync_start.attr,
8bb93aac 2870 &md_metadata.attr,
6d7ff738 2871 &md_new_device.attr,
16f17b39 2872 &md_safe_delay.attr,
9e653b63 2873 &md_array_state.attr,
411036fa
N		 2874 NULL,
2875};
2876
2877static struct attribute *md_redundancy_attrs[] = {
24dd469d 2878 &md_scan_mode.attr,
9d88883e 2879 &md_mismatches.attr,
88202a0c
N		 2880 &md_sync_min.attr,
2881 &md_sync_max.attr,
2882 &md_sync_speed.attr,
2883 &md_sync_completed.attr,
e464eafd
N		 2884 &md_suspend_lo.attr,
2885 &md_suspend_hi.attr,
9b1d1dac 2886 &md_bitmap.attr,
eae1701f
N		 2887 NULL,
2888};
411036fa
N		 2889static struct attribute_group md_redundancy_group = {
2890 .name = NULL,
2891 .attrs = md_redundancy_attrs,
2892};
2893
eae1701f
N		 2894
2895static ssize_t
2896md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2897{
2898 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2899 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2900 ssize_t rv;
eae1701f
N		 2901
2902 if (!entry->show)
2903 return -EIO;
5dc5cf7d
IM		 2904 rv = mddev_lock(mddev);
2905 if (!rv) {
2906 rv = entry->show(mddev, page);
2907 mddev_unlock(mddev);
2908 }
96de1e66 2909 return rv;
eae1701f
N		 2910}
2911
2912static ssize_t
2913md_attr_store(struct kobject *kobj, struct attribute *attr,
2914 const char *page, size_t length)
2915{
2916 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2917 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2918 ssize_t rv;
eae1701f
N		 2919
2920 if (!entry->store)
2921 return -EIO;
67463acb
N		 2922 if (!capable(CAP_SYS_ADMIN))
2923 return -EACCES;
5dc5cf7d
IM		 2924 rv = mddev_lock(mddev);
2925 if (!rv) {
2926 rv = entry->store(mddev, page, length);
2927 mddev_unlock(mddev);
2928 }
96de1e66 2929 return rv;
eae1701f
N		 2930}
2931
2932static void md_free(struct kobject *ko)
2933{
2934 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2935 kfree(mddev);
2936}
2937
2938static struct sysfs_ops md_sysfs_ops = {
2939 .show = md_attr_show,
2940 .store = md_attr_store,
2941};
2942static struct kobj_type md_ktype = {
2943 .release = md_free,
2944 .sysfs_ops = &md_sysfs_ops,
2945 .default_attrs = md_default_attrs,
2946};
2947
1da177e4
LT		 2948int mdp_major = 0;
2949
2950static struct kobject *md_probe(dev_t dev, int *part, void *data)
2951{
48c9c27b 2952 static DEFINE_MUTEX(disks_mutex);
1da177e4
LT		 2953 mddev_t *mddev = mddev_find(dev);
2954 struct gendisk *disk;
2955 int partitioned = (MAJOR(dev) != MD_MAJOR);
2956 int shift = partitioned ? MdpMinorShift : 0;
2957 int unit = MINOR(dev) >> shift;
2958
2959 if (!mddev)
2960 return NULL;
2961
48c9c27b 2962 mutex_lock(&disks_mutex);
1da177e4 2963 if (mddev->gendisk) {
48c9c27b 2964 mutex_unlock(&disks_mutex);
1da177e4
LT		 2965 mddev_put(mddev);
2966 return NULL;
2967 }
2968 disk = alloc_disk(1 << shift);
2969 if (!disk) {
48c9c27b 2970 mutex_unlock(&disks_mutex);
1da177e4
LT		 2971 mddev_put(mddev);
2972 return NULL;
2973 }
2974 disk->major = MAJOR(dev);
2975 disk->first_minor = unit << shift;
ce7b0f46 2976 if (partitioned)
1da177e4 2977 sprintf(disk->disk_name, "md_d%d", unit);
ce7b0f46 2978 else
1da177e4 2979 sprintf(disk->disk_name, "md%d", unit);
1da177e4
LT		 2980 disk->fops = &md_fops;
2981 disk->private_data = mddev;
2982 disk->queue = mddev->queue;
2983 add_disk(disk);
2984 mddev->gendisk = disk;
48c9c27b 2985 mutex_unlock(&disks_mutex);
9c791977 2986 mddev->kobj.parent = &disk->kobj;
eae1701f
N		 2987 mddev->kobj.k_name = NULL;
2988 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
2989 mddev->kobj.ktype = &md_ktype;
5e55e2f5
N		 2990 if (kobject_register(&mddev->kobj))
2991 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
2992 disk->disk_name);
1da177e4
LT		 2993 return NULL;
2994}
2995
1da177e4
LT		 2996static void md_safemode_timeout(unsigned long data)
2997{
2998 mddev_t *mddev = (mddev_t *) data;
2999
3000 mddev->safemode = 1;
3001 md_wakeup_thread(mddev->thread);
3002}
3003
6ff8d8ec 3004static int start_dirty_degraded;
1da177e4
LT		 3005
3006static int do_md_run(mddev_t * mddev)
3007{
2604b703 3008 int err;
1da177e4
LT		 3009 int chunk_size;
3010 struct list_head *tmp;
3011 mdk_rdev_t *rdev;
3012 struct gendisk *disk;
2604b703 3013 struct mdk_personality *pers;
1da177e4
LT		 3014 char b[BDEVNAME_SIZE];
3015
a757e64c
N		 3016 if (list_empty(&mddev->disks))
3017 /* cannot run an array with no devices.. */
1da177e4 3018 return -EINVAL;
1da177e4
LT		 3019
3020 if (mddev->pers)
3021 return -EBUSY;
3022
3023 /*
3024 * Analyze all RAID superblock(s)
3025 */
a757e64c
N		 3026 if (!mddev->raid_disks)
3027 analyze_sbs(mddev);
1da177e4
LT		 3028
3029 chunk_size = mddev->chunk_size;
2604b703
N		 3030
3031 if (chunk_size) {
1da177e4
LT		 3032 if (chunk_size > MAX_CHUNK_SIZE) {
3033 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3034 chunk_size, MAX_CHUNK_SIZE);
3035 return -EINVAL;
3036 }
3037 /*
3038 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3039 */
3040 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 3041 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 3042 return -EINVAL;
3043 }
3044 if (chunk_size < PAGE_SIZE) {
3045 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
3046 chunk_size, PAGE_SIZE);
3047 return -EINVAL;
3048 }
3049
3050 /* devices must have minimum size of one chunk */
3051 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 3052 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3053 continue;
3054 if (rdev->size < chunk_size / 1024) {
3055 printk(KERN_WARNING
3056 "md: Dev %s smaller than chunk_size:"
3057 " %lluk < %dk\n",
3058 bdevname(rdev->bdev,b),
3059 (unsigned long long)rdev->size,
3060 chunk_size / 1024);
3061 return -EINVAL;
3062 }
3063 }
3064 }
3065
1da177e4 3066#ifdef CONFIG_KMOD
d9d166c2
N		 3067 if (mddev->level != LEVEL_NONE)
3068 request_module("md-level-%d", mddev->level);
3069 else if (mddev->clevel[0])
3070 request_module("md-%s", mddev->clevel);
1da177e4
LT		 3071#endif
3072
3073 /*
3074 * Drop all container device buffers, from now on
3075 * the only valid external interface is through the md
3076 * device.
3077 * Also find largest hardsector size
3078 */
3079 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 3080 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3081 continue;
3082 sync_blockdev(rdev->bdev);
3083 invalidate_bdev(rdev->bdev, 0);
3084 }
3085
3086 md_probe(mddev->unit, NULL, NULL);
3087 disk = mddev->gendisk;
3088 if (!disk)
3089 return -ENOMEM;
3090
3091 spin_lock(&pers_lock);
d9d166c2 3092 pers = find_pers(mddev->level, mddev->clevel);
2604b703 3093 if (!pers || !try_module_get(pers->owner)) {
1da177e4 3094 spin_unlock(&pers_lock);
d9d166c2
N		 3095 if (mddev->level != LEVEL_NONE)
3096 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3097 mddev->level);
3098 else
3099 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3100 mddev->clevel);
1da177e4
LT		 3101 return -EINVAL;
3102 }
2604b703 3103 mddev->pers = pers;
1da177e4 3104 spin_unlock(&pers_lock);
d9d166c2
N		 3105 mddev->level = pers->level;
3106 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
1da177e4 3107
f6705578 3108 if (mddev->reshape_position != MaxSector &&
63c70c4f 3109 pers->start_reshape == NULL) {
f6705578
N		 3110 /* This personality cannot handle reshaping... */
3111 mddev->pers = NULL;
3112 module_put(pers->owner);
3113 return -EINVAL;
3114 }
3115
7dd5e7c3
N		 3116 if (pers->sync_request) {
3117 /* Warn if this is a potentially silly
3118 * configuration.
3119 */
3120 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3121 mdk_rdev_t *rdev2;
3122 struct list_head *tmp2;
3123 int warned = 0;
3124 ITERATE_RDEV(mddev, rdev, tmp) {
3125 ITERATE_RDEV(mddev, rdev2, tmp2) {
3126 if (rdev < rdev2 &&
3127 rdev->bdev->bd_contains ==
3128 rdev2->bdev->bd_contains) {
3129 printk(KERN_WARNING
3130 "%s: WARNING: %s appears to be"
3131 " on the same physical disk as"
3132 " %s.\n",
3133 mdname(mddev),
3134 bdevname(rdev->bdev,b),
3135 bdevname(rdev2->bdev,b2));
3136 warned = 1;
3137 }
3138 }
3139 }
3140 if (warned)
3141 printk(KERN_WARNING
3142 "True protection against single-disk"
3143 " failure might be compromised.\n");
3144 }
3145
657390d2 3146 mddev->recovery = 0;
1da177e4 3147 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 3148 mddev->barriers_work = 1;
6ff8d8ec 3149 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 3150
f91de92e
N		 3151 if (start_readonly)
3152 mddev->ro = 2; /* read-only, but switch on first write */
3153
b15c2e57
N		 3154 err = mddev->pers->run(mddev);
3155 if (!err && mddev->pers->sync_request) {
3156 err = bitmap_create(mddev);
3157 if (err) {
3158 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3159 mdname(mddev), err);
3160 mddev->pers->stop(mddev);
3161 }
3162 }
1da177e4
LT		 3163 if (err) {
3164 printk(KERN_ERR "md: pers->run() failed ...\n");
3165 module_put(mddev->pers->owner);
3166 mddev->pers = NULL;
32a7627c
N		 3167 bitmap_destroy(mddev);
3168 return err;
1da177e4 3169 }
5e55e2f5
N		 3170 if (mddev->pers->sync_request) {
3171 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3172 printk(KERN_WARNING
3173 "md: cannot register extra attributes for %s\n",
3174 mdname(mddev));
3175 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
fd9d49ca
N		 3176 mddev->ro = 0;
3177
1da177e4
LT		 3178 atomic_set(&mddev->writes_pending,0);
3179 mddev->safemode = 0;
3180 mddev->safemode_timer.function = md_safemode_timeout;
3181 mddev->safemode_timer.data = (unsigned long) mddev;
16f17b39 3182 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
1da177e4 3183 mddev->in_sync = 1;
86e6ffdd
N		 3184
3185 ITERATE_RDEV(mddev,rdev,tmp)
3186 if (rdev->raid_disk >= 0) {
3187 char nm[20];
3188 sprintf(nm, "rd%d", rdev->raid_disk);
5e55e2f5
N		 3189 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3190 printk("md: cannot register %s for %s\n",
3191 nm, mdname(mddev));
86e6ffdd 3192 }
1da177e4
LT		 3193
3194 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3195
850b2b42
N		 3196 if (mddev->flags)
3197 md_update_sb(mddev, 0);
1da177e4
LT		 3198
3199 set_capacity(disk, mddev->array_size<<1);
3200
3201 /* If we call blk_queue_make_request here, it will
3202 * re-initialise max_sectors etc which may have been
3203 * refined inside -> run. So just set the bits we need to set.
3204 * Most initialisation happended when we called
3205 * blk_queue_make_request(..., md_fail_request)
3206 * earlier.
3207 */
3208 mddev->queue->queuedata = mddev;
3209 mddev->queue->make_request_fn = mddev->pers->make_request;
3210
5fd6c1dc
N		 3211 /* If there is a partially-recovered drive we need to
3212 * start recovery here. If we leave it to md_check_recovery,
3213 * it will remove the drives and not do the right thing
3214 */
0b8c9de0 3215 if (mddev->degraded && !mddev->sync_thread) {
5fd6c1dc
N		 3216 struct list_head *rtmp;
3217 int spares = 0;
3218 ITERATE_RDEV(mddev,rdev,rtmp)
3219 if (rdev->raid_disk >= 0 &&
3220 !test_bit(In_sync, &rdev->flags) &&
3221 !test_bit(Faulty, &rdev->flags))
3222 /* complete an interrupted recovery */
3223 spares++;
3224 if (spares && mddev->pers->sync_request) {
3225 mddev->recovery = 0;
3226 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3227 mddev->sync_thread = md_register_thread(md_do_sync,
3228 mddev,
3229 "%s_resync");
3230 if (!mddev->sync_thread) {
3231 printk(KERN_ERR "%s: could not start resync"
3232 " thread...\n",
3233 mdname(mddev));
3234 /* leave the spares where they are, it shouldn't hurt */
3235 mddev->recovery = 0;
0b8c9de0 3236 }
5fd6c1dc
N		 3237 }
3238 }
0b8c9de0
N		 3239 md_wakeup_thread(mddev->thread);
3240 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5fd6c1dc 3241
1da177e4 3242 mddev->changed = 1;
d7603b7e 3243 md_new_event(mddev);
2f471303 3244 kobject_uevent(&mddev->gendisk->kobj, KOBJ_CHANGE);
1da177e4
LT		 3245 return 0;
3246}
3247
3248static int restart_array(mddev_t *mddev)
3249{
3250 struct gendisk *disk = mddev->gendisk;
3251 int err;
3252
3253 /*
3254 * Complain if it has no devices
3255 */
3256 err = -ENXIO;
3257 if (list_empty(&mddev->disks))
3258 goto out;
3259
3260 if (mddev->pers) {
3261 err = -EBUSY;
3262 if (!mddev->ro)
3263 goto out;
3264
3265 mddev->safemode = 0;
3266 mddev->ro = 0;
3267 set_disk_ro(disk, 0);
3268
3269 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3270 mdname(mddev));
3271 /*
3272 * Kick recovery or resync if necessary
3273 */
3274 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3275 md_wakeup_thread(mddev->thread);
5fd6c1dc 3276 md_wakeup_thread(mddev->sync_thread);
1da177e4 3277 err = 0;
9e653b63 3278 } else
1da177e4 3279 err = -EINVAL;
1da177e4
LT		 3280
3281out:
3282 return err;
3283}
3284
acc55e22
N		 3285/* similar to deny_write_access, but accounts for our holding a reference
3286 * to the file ourselves */
3287static int deny_bitmap_write_access(struct file * file)
3288{
3289 struct inode *inode = file->f_mapping->host;
3290
3291 spin_lock(&inode->i_lock);
3292 if (atomic_read(&inode->i_writecount) > 1) {
3293 spin_unlock(&inode->i_lock);
3294 return -ETXTBSY;
3295 }
3296 atomic_set(&inode->i_writecount, -1);
3297 spin_unlock(&inode->i_lock);
3298
3299 return 0;
3300}
3301
3302static void restore_bitmap_write_access(struct file *file)
3303{
3304 struct inode *inode = file->f_mapping->host;
3305
3306 spin_lock(&inode->i_lock);
3307 atomic_set(&inode->i_writecount, 1);
3308 spin_unlock(&inode->i_lock);
3309}
3310
9e653b63
N		 3311/* mode:
3312 * 0 - completely stop and dis-assemble array
3313 * 1 - switch to readonly
3314 * 2 - stop but do not disassemble array
3315 */
3316static int do_md_stop(mddev_t * mddev, int mode)
1da177e4
LT		 3317{
3318 int err = 0;
3319 struct gendisk *disk = mddev->gendisk;
3320
3321 if (mddev->pers) {
3322 if (atomic_read(&mddev->active)>2) {
3323 printk("md: %s still in use.\n",mdname(mddev));
3324 return -EBUSY;
3325 }
3326
3327 if (mddev->sync_thread) {
5fd6c1dc 3328 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4
LT		 3329 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3330 md_unregister_thread(mddev->sync_thread);
3331 mddev->sync_thread = NULL;
3332 }
3333
3334 del_timer_sync(&mddev->safemode_timer);
3335
3336 invalidate_partition(disk, 0);
3337
9e653b63
N		 3338 switch(mode) {
3339 case 1: /* readonly */
1da177e4 3340 err = -ENXIO;
f91de92e 3341 if (mddev->ro==1)
1da177e4
LT		 3342 goto out;
3343 mddev->ro = 1;
9e653b63
N		 3344 break;
3345 case 0: /* disassemble */
3346 case 2: /* stop */
6b8b3e8a 3347 bitmap_flush(mddev);
a9701a30 3348 md_super_wait(mddev);
1da177e4
LT		 3349 if (mddev->ro)
3350 set_disk_ro(disk, 0);
3351 blk_queue_make_request(mddev->queue, md_fail_request);
3352 mddev->pers->stop(mddev);
d1b5380c
N		 3353 mddev->queue->merge_bvec_fn = NULL;
3354 mddev->queue->unplug_fn = NULL;
3355 mddev->queue->issue_flush_fn = NULL;
041ae52e 3356 mddev->queue->backing_dev_info.congested_fn = NULL;
411036fa
N		 3357 if (mddev->pers->sync_request)
3358 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3359
1da177e4
LT		 3360 module_put(mddev->pers->owner);
3361 mddev->pers = NULL;
0d4ca600
N		 3362
3363 set_capacity(disk, 0);
3364 mddev->changed = 1;
3365
1da177e4
LT		 3366 if (mddev->ro)
3367 mddev->ro = 0;
3368 }
850b2b42 3369 if (!mddev->in_sync || mddev->flags) {
1da177e4
LT		 3370 /* mark array as shutdown cleanly */
3371 mddev->in_sync = 1;
850b2b42 3372 md_update_sb(mddev, 1);
1da177e4 3373 }
9e653b63 3374 if (mode == 1)
1da177e4 3375 set_disk_ro(disk, 1);
5fd6c1dc 3376 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4 3377 }
32a7627c 3378
1da177e4
LT		 3379 /*
3380 * Free resources if final stop
3381 */
9e653b63 3382 if (mode == 0) {
86e6ffdd
N		 3383 mdk_rdev_t *rdev;
3384 struct list_head *tmp;
0d4ca600 3385
1da177e4
LT		 3386 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3387
978f946b
N		 3388 bitmap_destroy(mddev);
3389 if (mddev->bitmap_file) {
acc55e22 3390 restore_bitmap_write_access(mddev->bitmap_file);
978f946b
N		 3391 fput(mddev->bitmap_file);
3392 mddev->bitmap_file = NULL;
3393 }
3394 mddev->bitmap_offset = 0;
3395
86e6ffdd
N		 3396 ITERATE_RDEV(mddev,rdev,tmp)
3397 if (rdev->raid_disk >= 0) {
3398 char nm[20];
3399 sprintf(nm, "rd%d", rdev->raid_disk);
3400 sysfs_remove_link(&mddev->kobj, nm);
3401 }
3402
5792a285
N		 3403 /* make sure all delayed_delete calls have finished */
3404 flush_scheduled_work();
3405
1da177e4
LT		 3406 export_array(mddev);
3407
3408 mddev->array_size = 0;
9e653b63
N		 3409 mddev->size = 0;
3410 mddev->raid_disks = 0;
a94213b1 3411 mddev->recovery_cp = 0;
9e653b63 3412
a8a55c38 3413 } else if (mddev->pers)
1da177e4
LT		 3414 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3415 mdname(mddev));
3416 err = 0;
d7603b7e 3417 md_new_event(mddev);
1da177e4
LT		 3418out:
3419 return err;
3420}
3421
fdee8ae4 3422#ifndef MODULE
1da177e4
LT		 3423static void autorun_array(mddev_t *mddev)
3424{
3425 mdk_rdev_t *rdev;
3426 struct list_head *tmp;
3427 int err;
3428
a757e64c 3429 if (list_empty(&mddev->disks))
1da177e4 3430 return;
1da177e4
LT		 3431
3432 printk(KERN_INFO "md: running: ");
3433
3434 ITERATE_RDEV(mddev,rdev,tmp) {
3435 char b[BDEVNAME_SIZE];
3436 printk("<%s>", bdevname(rdev->bdev,b));
3437 }
3438 printk("\n");
3439
3440 err = do_md_run (mddev);
3441 if (err) {
3442 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3443 do_md_stop (mddev, 0);
3444 }
3445}
3446
3447/*
3448 * lets try to run arrays based on all disks that have arrived
3449 * until now. (those are in pending_raid_disks)
3450 *
3451 * the method: pick the first pending disk, collect all disks with
3452 * the same UUID, remove all from the pending list and put them into
3453 * the 'same_array' list. Then order this list based on superblock
3454 * update time (freshest comes first), kick out 'old' disks and
3455 * compare superblocks. If everything's fine then run it.
3456 *
3457 * If "unit" is allocated, then bump its reference count
3458 */
3459static void autorun_devices(int part)
3460{
1da177e4
LT		 3461 struct list_head *tmp;
3462 mdk_rdev_t *rdev0, *rdev;
3463 mddev_t *mddev;
3464 char b[BDEVNAME_SIZE];
3465
3466 printk(KERN_INFO "md: autorun ...\n");
3467 while (!list_empty(&pending_raid_disks)) {
e8703fe1 3468 int unit;
1da177e4 3469 dev_t dev;
ad01c9e3 3470 LIST_HEAD(candidates);
1da177e4
LT		 3471 rdev0 = list_entry(pending_raid_disks.next,
3472 mdk_rdev_t, same_set);
3473
3474 printk(KERN_INFO "md: considering %s ...\n",
3475 bdevname(rdev0->bdev,b));
3476 INIT_LIST_HEAD(&candidates);
3477 ITERATE_RDEV_PENDING(rdev,tmp)
3478 if (super_90_load(rdev, rdev0, 0) >= 0) {
3479 printk(KERN_INFO "md: adding %s ...\n",
3480 bdevname(rdev->bdev,b));
3481 list_move(&rdev->same_set, &candidates);
3482 }
3483 /*
3484 * now we have a set of devices, with all of them having
3485 * mostly sane superblocks. It's time to allocate the
3486 * mddev.
3487 */
e8703fe1
N		 3488 if (part) {
3489 dev = MKDEV(mdp_major,
3490 rdev0->preferred_minor << MdpMinorShift);
3491 unit = MINOR(dev) >> MdpMinorShift;
3492 } else {
3493 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3494 unit = MINOR(dev);
3495 }
3496 if (rdev0->preferred_minor != unit) {
1da177e4
LT		 3497 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3498 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3499 break;
3500 }
1da177e4
LT		 3501
3502 md_probe(dev, NULL, NULL);
3503 mddev = mddev_find(dev);
3504 if (!mddev) {
3505 printk(KERN_ERR
3506 "md: cannot allocate memory for md drive.\n");
3507 break;
3508 }
3509 if (mddev_lock(mddev))
3510 printk(KERN_WARNING "md: %s locked, cannot run\n",
3511 mdname(mddev));
3512 else if (mddev->raid_disks || mddev->major_version
3513 || !list_empty(&mddev->disks)) {
3514 printk(KERN_WARNING
3515 "md: %s already running, cannot run %s\n",
3516 mdname(mddev), bdevname(rdev0->bdev,b));
3517 mddev_unlock(mddev);
3518 } else {
3519 printk(KERN_INFO "md: created %s\n", mdname(mddev));
3520 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
3521 list_del_init(&rdev->same_set);
3522 if (bind_rdev_to_array(rdev, mddev))
3523 export_rdev(rdev);
3524 }
3525 autorun_array(mddev);
3526 mddev_unlock(mddev);
3527 }
3528 /* on success, candidates will be empty, on error
3529 * it won't...
3530 */
3531 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
3532 export_rdev(rdev);
3533 mddev_put(mddev);
3534 }
3535 printk(KERN_INFO "md: ... autorun DONE.\n");
3536}
fdee8ae4 3537#endif /* !MODULE */
1da177e4 3538
1da177e4
LT		 3539static int get_version(void __user * arg)
3540{
3541 mdu_version_t ver;
3542
3543 ver.major = MD_MAJOR_VERSION;
3544 ver.minor = MD_MINOR_VERSION;
3545 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3546
3547 if (copy_to_user(arg, &ver, sizeof(ver)))
3548 return -EFAULT;
3549
3550 return 0;
3551}
3552
3553static int get_array_info(mddev_t * mddev, void __user * arg)
3554{
3555 mdu_array_info_t info;
3556 int nr,working,active,failed,spare;
3557 mdk_rdev_t *rdev;
3558 struct list_head *tmp;
3559
3560 nr=working=active=failed=spare=0;
3561 ITERATE_RDEV(mddev,rdev,tmp) {
3562 nr++;
b2d444d7 3563 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3564 failed++;
3565 else {
3566 working++;
b2d444d7 3567 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 3568 active++;
3569 else
3570 spare++;
3571 }
3572 }
3573
3574 info.major_version = mddev->major_version;
3575 info.minor_version = mddev->minor_version;
3576 info.patch_version = MD_PATCHLEVEL_VERSION;
3577 info.ctime = mddev->ctime;
3578 info.level = mddev->level;
3579 info.size = mddev->size;
284ae7ca
N		 3580 if (info.size != mddev->size) /* overflow */
3581 info.size = -1;
1da177e4
LT		 3582 info.nr_disks = nr;
3583 info.raid_disks = mddev->raid_disks;
3584 info.md_minor = mddev->md_minor;
3585 info.not_persistent= !mddev->persistent;
3586
3587 info.utime = mddev->utime;
3588 info.state = 0;
3589 if (mddev->in_sync)
3590 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 3591 if (mddev->bitmap && mddev->bitmap_offset)
3592 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 3593 info.active_disks = active;
3594 info.working_disks = working;
3595 info.failed_disks = failed;
3596 info.spare_disks = spare;
3597
3598 info.layout = mddev->layout;
3599 info.chunk_size = mddev->chunk_size;
3600
3601 if (copy_to_user(arg, &info, sizeof(info)))
3602 return -EFAULT;
3603
3604 return 0;
3605}
3606
87162a28 3607static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 3608{
3609 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3610 char *ptr, *buf = NULL;
3611 int err = -ENOMEM;
3612
2a2275d6
N		 3613 md_allow_write(mddev);
3614
32a7627c
N		 3615 file = kmalloc(sizeof(*file), GFP_KERNEL);
3616 if (!file)
3617 goto out;
3618
3619 /* bitmap disabled, zero the first byte and copy out */
3620 if (!mddev->bitmap || !mddev->bitmap->file) {
3621 file->pathname[0] = '\0';
3622 goto copy_out;
3623 }
3624
3625 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3626 if (!buf)
3627 goto out;
3628
3629 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3630 if (!ptr)
3631 goto out;
3632
3633 strcpy(file->pathname, ptr);
3634
3635copy_out:
3636 err = 0;
3637 if (copy_to_user(arg, file, sizeof(*file)))
3638 err = -EFAULT;
3639out:
3640 kfree(buf);
3641 kfree(file);
3642 return err;
3643}
3644
1da177e4
LT		 3645static int get_disk_info(mddev_t * mddev, void __user * arg)
3646{
3647 mdu_disk_info_t info;
3648 unsigned int nr;
3649 mdk_rdev_t *rdev;
3650
3651 if (copy_from_user(&info, arg, sizeof(info)))
3652 return -EFAULT;
3653
3654 nr = info.number;
3655
3656 rdev = find_rdev_nr(mddev, nr);
3657 if (rdev) {
3658 info.major = MAJOR(rdev->bdev->bd_dev);
3659 info.minor = MINOR(rdev->bdev->bd_dev);
3660 info.raid_disk = rdev->raid_disk;
3661 info.state = 0;
b2d444d7 3662 if (test_bit(Faulty, &rdev->flags))
1da177e4 3663 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 3664 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 3665 info.state |= (1<<MD_DISK_ACTIVE);
3666 info.state |= (1<<MD_DISK_SYNC);
3667 }
8ddf9efe
N		 3668 if (test_bit(WriteMostly, &rdev->flags))
3669 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 3670 } else {
3671 info.major = info.minor = 0;
3672 info.raid_disk = -1;
3673 info.state = (1<<MD_DISK_REMOVED);
3674 }
3675
3676 if (copy_to_user(arg, &info, sizeof(info)))
3677 return -EFAULT;
3678
3679 return 0;
3680}
3681
3682static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3683{
3684 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3685 mdk_rdev_t *rdev;
3686 dev_t dev = MKDEV(info->major,info->minor);
3687
3688 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3689 return -EOVERFLOW;
3690
3691 if (!mddev->raid_disks) {
3692 int err;
3693 /* expecting a device which has a superblock */
3694 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3695 if (IS_ERR(rdev)) {
3696 printk(KERN_WARNING
3697 "md: md_import_device returned %ld\n",
3698 PTR_ERR(rdev));
3699 return PTR_ERR(rdev);
3700 }
3701 if (!list_empty(&mddev->disks)) {
3702 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3703 mdk_rdev_t, same_set);
3704 int err = super_types[mddev->major_version]
3705 .load_super(rdev, rdev0, mddev->minor_version);
3706 if (err < 0) {
3707 printk(KERN_WARNING
3708 "md: %s has different UUID to %s\n",
3709 bdevname(rdev->bdev,b),
3710 bdevname(rdev0->bdev,b2));
3711 export_rdev(rdev);
3712 return -EINVAL;
3713 }
3714 }
3715 err = bind_rdev_to_array(rdev, mddev);
3716 if (err)
3717 export_rdev(rdev);
3718 return err;
3719 }
3720
3721 /*
3722 * add_new_disk can be used once the array is assembled
3723 * to add "hot spares". They must already have a superblock
3724 * written
3725 */
3726 if (mddev->pers) {
3727 int err;
3728 if (!mddev->pers->hot_add_disk) {
3729 printk(KERN_WARNING
3730 "%s: personality does not support diskops!\n",
3731 mdname(mddev));
3732 return -EINVAL;
3733 }
7b1e35f6
N		 3734 if (mddev->persistent)
3735 rdev = md_import_device(dev, mddev->major_version,
3736 mddev->minor_version);
3737 else
3738 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 3739 if (IS_ERR(rdev)) {
3740 printk(KERN_WARNING
3741 "md: md_import_device returned %ld\n",
3742 PTR_ERR(rdev));
3743 return PTR_ERR(rdev);
3744 }
41158c7e
N		 3745 /* set save_raid_disk if appropriate */
3746 if (!mddev->persistent) {
3747 if (info->state & (1<<MD_DISK_SYNC) &&
3748 info->raid_disk < mddev->raid_disks)
3749 rdev->raid_disk = info->raid_disk;
3750 else
3751 rdev->raid_disk = -1;
3752 } else
3753 super_types[mddev->major_version].
3754 validate_super(mddev, rdev);
3755 rdev->saved_raid_disk = rdev->raid_disk;
3756
b2d444d7 3757 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 3758 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3759 set_bit(WriteMostly, &rdev->flags);
3760
1da177e4
LT		 3761 rdev->raid_disk = -1;
3762 err = bind_rdev_to_array(rdev, mddev);
7c7546cc
N		 3763 if (!err && !mddev->pers->hot_remove_disk) {
3764 /* If there is hot_add_disk but no hot_remove_disk
3765 * then added disks for geometry changes,
3766 * and should be added immediately.
3767 */
3768 super_types[mddev->major_version].
3769 validate_super(mddev, rdev);
3770 err = mddev->pers->hot_add_disk(mddev, rdev);
3771 if (err)
3772 unbind_rdev_from_array(rdev);
3773 }
1da177e4
LT		 3774 if (err)
3775 export_rdev(rdev);
c361777f 3776
17571284 3777 md_update_sb(mddev, 1);
c361777f 3778 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 3779 md_wakeup_thread(mddev->thread);
1da177e4
LT		 3780 return err;
3781 }
3782
3783 /* otherwise, add_new_disk is only allowed
3784 * for major_version==0 superblocks
3785 */
3786 if (mddev->major_version != 0) {
3787 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3788 mdname(mddev));
3789 return -EINVAL;
3790 }
3791
3792 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3793 int err;
3794 rdev = md_import_device (dev, -1, 0);
3795 if (IS_ERR(rdev)) {
3796 printk(KERN_WARNING
3797 "md: error, md_import_device() returned %ld\n",
3798 PTR_ERR(rdev));
3799 return PTR_ERR(rdev);
3800 }
3801 rdev->desc_nr = info->number;
3802 if (info->raid_disk < mddev->raid_disks)
3803 rdev->raid_disk = info->raid_disk;
3804 else
3805 rdev->raid_disk = -1;
3806
b2d444d7
N		 3807 rdev->flags = 0;
3808
1da177e4 3809 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 3810 if (info->state & (1<<MD_DISK_SYNC))
3811 set_bit(In_sync, &rdev->flags);
1da177e4 3812
8ddf9efe
N		 3813 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3814 set_bit(WriteMostly, &rdev->flags);
3815
1da177e4
LT		 3816 if (!mddev->persistent) {
3817 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3818 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3819 } else
3820 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3821 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3822
2bf071bf
N		 3823 err = bind_rdev_to_array(rdev, mddev);
3824 if (err) {
3825 export_rdev(rdev);
3826 return err;
3827 }
1da177e4
LT		 3828 }
3829
3830 return 0;
3831}
3832
3833static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3834{
3835 char b[BDEVNAME_SIZE];
3836 mdk_rdev_t *rdev;
3837
3838 if (!mddev->pers)
3839 return -ENODEV;
3840
3841 rdev = find_rdev(mddev, dev);
3842 if (!rdev)
3843 return -ENXIO;
3844
3845 if (rdev->raid_disk >= 0)
3846 goto busy;
3847
3848 kick_rdev_from_array(rdev);
850b2b42 3849 md_update_sb(mddev, 1);
d7603b7e 3850 md_new_event(mddev);
1da177e4
LT		 3851
3852 return 0;
3853busy:
3854 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3855 bdevname(rdev->bdev,b), mdname(mddev));
3856 return -EBUSY;
3857}
3858
3859static int hot_add_disk(mddev_t * mddev, dev_t dev)
3860{
3861 char b[BDEVNAME_SIZE];
3862 int err;
3863 unsigned int size;
3864 mdk_rdev_t *rdev;
3865
3866 if (!mddev->pers)
3867 return -ENODEV;
3868
3869 if (mddev->major_version != 0) {
3870 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3871 " version-0 superblocks.\n",
3872 mdname(mddev));
3873 return -EINVAL;
3874 }
3875 if (!mddev->pers->hot_add_disk) {
3876 printk(KERN_WARNING
3877 "%s: personality does not support diskops!\n",
3878 mdname(mddev));
3879 return -EINVAL;
3880 }
3881
3882 rdev = md_import_device (dev, -1, 0);
3883 if (IS_ERR(rdev)) {
3884 printk(KERN_WARNING
3885 "md: error, md_import_device() returned %ld\n",
3886 PTR_ERR(rdev));
3887 return -EINVAL;
3888 }
3889
3890 if (mddev->persistent)
3891 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3892 else
3893 rdev->sb_offset =
3894 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3895
3896 size = calc_dev_size(rdev, mddev->chunk_size);
3897 rdev->size = size;
3898
b2d444d7 3899 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 3900 printk(KERN_WARNING
3901 "md: can not hot-add faulty %s disk to %s!\n",
3902 bdevname(rdev->bdev,b), mdname(mddev));
3903 err = -EINVAL;
3904 goto abort_export;
3905 }
b2d444d7 3906 clear_bit(In_sync, &rdev->flags);
1da177e4 3907 rdev->desc_nr = -1;
5842730d 3908 rdev->saved_raid_disk = -1;
2bf071bf
N		 3909 err = bind_rdev_to_array(rdev, mddev);
3910 if (err)
3911 goto abort_export;
1da177e4
LT		 3912
3913 /*
3914 * The rest should better be atomic, we can have disk failures
3915 * noticed in interrupt contexts ...
3916 */
3917
3918 if (rdev->desc_nr == mddev->max_disks) {
3919 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
3920 mdname(mddev));
3921 err = -EBUSY;
3922 goto abort_unbind_export;
3923 }
3924
3925 rdev->raid_disk = -1;
3926
850b2b42 3927 md_update_sb(mddev, 1);
1da177e4
LT		 3928
3929 /*
3930 * Kick recovery, maybe this spare has to be added to the
3931 * array immediately.
3932 */
3933 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3934 md_wakeup_thread(mddev->thread);
d7603b7e 3935 md_new_event(mddev);
1da177e4
LT		 3936 return 0;
3937
3938abort_unbind_export:
3939 unbind_rdev_from_array(rdev);
3940
3941abort_export:
3942 export_rdev(rdev);
3943 return err;
3944}
3945
32a7627c
N		 3946static int set_bitmap_file(mddev_t *mddev, int fd)
3947{
3948 int err;
3949
36fa3063
N		 3950 if (mddev->pers) {
3951 if (!mddev->pers->quiesce)
3952 return -EBUSY;
3953 if (mddev->recovery || mddev->sync_thread)
3954 return -EBUSY;
3955 /* we should be able to change the bitmap.. */
3956 }
32a7627c 3957
32a7627c 3958
36fa3063
N		 3959 if (fd >= 0) {
3960 if (mddev->bitmap)
3961 return -EEXIST; /* cannot add when bitmap is present */
3962 mddev->bitmap_file = fget(fd);
32a7627c 3963
36fa3063
N		 3964 if (mddev->bitmap_file == NULL) {
3965 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
3966 mdname(mddev));
3967 return -EBADF;
3968 }
3969
3970 err = deny_bitmap_write_access(mddev->bitmap_file);
3971 if (err) {
3972 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
3973 mdname(mddev));
3974 fput(mddev->bitmap_file);
3975 mddev->bitmap_file = NULL;
3976 return err;
3977 }
a654b9d8 3978 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 3979 } else if (mddev->bitmap == NULL)
3980 return -ENOENT; /* cannot remove what isn't there */
3981 err = 0;
3982 if (mddev->pers) {
3983 mddev->pers->quiesce(mddev, 1);
3984 if (fd >= 0)
3985 err = bitmap_create(mddev);
d7375ab3 3986 if (fd < 0 || err) {
36fa3063 3987 bitmap_destroy(mddev);
d7375ab3
N		 3988 fd = -1; /* make sure to put the file */
3989 }
36fa3063 3990 mddev->pers->quiesce(mddev, 0);
d7375ab3
N		 3991 }
3992 if (fd < 0) {
acc55e22
N		 3993 if (mddev->bitmap_file) {
3994 restore_bitmap_write_access(mddev->bitmap_file);
36fa3063 3995 fput(mddev->bitmap_file);
acc55e22 3996 }
36fa3063
N		 3997 mddev->bitmap_file = NULL;
3998 }
3999
32a7627c
N		 4000 return err;
4001}
4002
1da177e4
LT		 4003/*
4004 * set_array_info is used two different ways
4005 * The original usage is when creating a new array.
4006 * In this usage, raid_disks is > 0 and it together with
4007 * level, size, not_persistent,layout,chunksize determine the
4008 * shape of the array.
4009 * This will always create an array with a type-0.90.0 superblock.
4010 * The newer usage is when assembling an array.
4011 * In this case raid_disks will be 0, and the major_version field is
4012 * use to determine which style super-blocks are to be found on the devices.
4013 * The minor and patch _version numbers are also kept incase the
4014 * super_block handler wishes to interpret them.
4015 */
4016static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4017{
4018
4019 if (info->raid_disks == 0) {
4020 /* just setting version number for superblock loading */
4021 if (info->major_version < 0 ||
4022 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
4023 super_types[info->major_version].name == NULL) {
4024 /* maybe try to auto-load a module? */
4025 printk(KERN_INFO
4026 "md: superblock version %d not known\n",
4027 info->major_version);
4028 return -EINVAL;
4029 }
4030 mddev->major_version = info->major_version;
4031 mddev->minor_version = info->minor_version;
4032 mddev->patch_version = info->patch_version;
3f9d7b0d 4033 mddev->persistent = !info->not_persistent;
1da177e4
LT		 4034 return 0;
4035 }
4036 mddev->major_version = MD_MAJOR_VERSION;
4037 mddev->minor_version = MD_MINOR_VERSION;
4038 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4039 mddev->ctime = get_seconds();
4040
4041 mddev->level = info->level;
17115e03 4042 mddev->clevel[0] = 0;
1da177e4
LT		 4043 mddev->size = info->size;
4044 mddev->raid_disks = info->raid_disks;
4045 /* don't set md_minor, it is determined by which /dev/md* was
4046 * openned
4047 */
4048 if (info->state & (1<<MD_SB_CLEAN))
4049 mddev->recovery_cp = MaxSector;
4050 else
4051 mddev->recovery_cp = 0;
4052 mddev->persistent = ! info->not_persistent;
4053
4054 mddev->layout = info->layout;
4055 mddev->chunk_size = info->chunk_size;
4056
4057 mddev->max_disks = MD_SB_DISKS;
4058
850b2b42
N		 4059 mddev->flags = 0;
4060 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 4061
b2a2703c
N		 4062 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4063 mddev->bitmap_offset = 0;
4064
f6705578
N		 4065 mddev->reshape_position = MaxSector;
4066
1da177e4
LT		 4067 /*
4068 * Generate a 128 bit UUID
4069 */
4070 get_random_bytes(mddev->uuid, 16);
4071
f6705578
N		 4072 mddev->new_level = mddev->level;
4073 mddev->new_chunk = mddev->chunk_size;
4074 mddev->new_layout = mddev->layout;
4075 mddev->delta_disks = 0;
4076
1da177e4
LT		 4077 return 0;
4078}
4079
a35b0d69
N		 4080static int update_size(mddev_t *mddev, unsigned long size)
4081{
4082 mdk_rdev_t * rdev;
4083 int rv;
4084 struct list_head *tmp;
8ddeeae5 4085 int fit = (size == 0);
a35b0d69
N		 4086
4087 if (mddev->pers->resize == NULL)
4088 return -EINVAL;
4089 /* The "size" is the amount of each device that is used.
4090 * This can only make sense for arrays with redundancy.
4091 * linear and raid0 always use whatever space is available
4092 * We can only consider changing the size if no resync
4093 * or reconstruction is happening, and if the new size
4094 * is acceptable. It must fit before the sb_offset or,
4095 * if that is <data_offset, it must fit before the
4096 * size of each device.
4097 * If size is zero, we find the largest size that fits.
4098 */
4099 if (mddev->sync_thread)
4100 return -EBUSY;
4101 ITERATE_RDEV(mddev,rdev,tmp) {
4102 sector_t avail;
01ab5662
N		 4103 avail = rdev->size * 2;
4104
a35b0d69
N		 4105 if (fit && (size == 0 || size > avail/2))
4106 size = avail/2;
4107 if (avail < ((sector_t)size << 1))
4108 return -ENOSPC;
4109 }
4110 rv = mddev->pers->resize(mddev, (sector_t)size *2);
4111 if (!rv) {
4112 struct block_device *bdev;
4113
4114 bdev = bdget_disk(mddev->gendisk, 0);
4115 if (bdev) {
1b1dcc1b 4116 mutex_lock(&bdev->bd_inode->i_mutex);
6d89332b 4117 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
1b1dcc1b 4118 mutex_unlock(&bdev->bd_inode->i_mutex);
a35b0d69
N		 4119 bdput(bdev);
4120 }
4121 }
4122 return rv;
4123}
4124
da943b99
N		 4125static int update_raid_disks(mddev_t *mddev, int raid_disks)
4126{
4127 int rv;
4128 /* change the number of raid disks */
63c70c4f 4129 if (mddev->pers->check_reshape == NULL)
da943b99
N		 4130 return -EINVAL;
4131 if (raid_disks <= 0 ||
4132 raid_disks >= mddev->max_disks)
4133 return -EINVAL;
63c70c4f 4134 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
da943b99 4135 return -EBUSY;
63c70c4f
N		 4136 mddev->delta_disks = raid_disks - mddev->raid_disks;
4137
4138 rv = mddev->pers->check_reshape(mddev);
da943b99
N		 4139 return rv;
4140}
4141
4142
1da177e4
LT		 4143/*
4144 * update_array_info is used to change the configuration of an
4145 * on-line array.
4146 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4147 * fields in the info are checked against the array.
4148 * Any differences that cannot be handled will cause an error.
4149 * Normally, only one change can be managed at a time.
4150 */
4151static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4152{
4153 int rv = 0;
4154 int cnt = 0;
36fa3063
N		 4155 int state = 0;
4156
4157 /* calculate expected state,ignoring low bits */
4158 if (mddev->bitmap && mddev->bitmap_offset)
4159 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 4160
4161 if (mddev->major_version != info->major_version ||
4162 mddev->minor_version != info->minor_version ||
4163/* mddev->patch_version != info->patch_version || */
4164 mddev->ctime != info->ctime ||
4165 mddev->level != info->level ||
4166/* mddev->layout != info->layout || */
4167 !mddev->persistent != info->not_persistent||
36fa3063
N		 4168 mddev->chunk_size != info->chunk_size ||
4169 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4170 ((state^info->state) & 0xfffffe00)
4171 )
1da177e4
LT		 4172 return -EINVAL;
4173 /* Check there is only one change */
284ae7ca 4174 if (info->size >= 0 && mddev->size != info->size) cnt++;
1da177e4
LT		 4175 if (mddev->raid_disks != info->raid_disks) cnt++;
4176 if (mddev->layout != info->layout) cnt++;
36fa3063 4177 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 4178 if (cnt == 0) return 0;
4179 if (cnt > 1) return -EINVAL;
4180
4181 if (mddev->layout != info->layout) {
4182 /* Change layout
4183 * we don't need to do anything at the md level, the
4184 * personality will take care of it all.
4185 */
4186 if (mddev->pers->reconfig == NULL)
4187 return -EINVAL;
4188 else
4189 return mddev->pers->reconfig(mddev, info->layout, -1);
4190 }
284ae7ca 4191 if (info->size >= 0 && mddev->size != info->size)
a35b0d69
N		 4192 rv = update_size(mddev, info->size);
4193
da943b99
N		 4194 if (mddev->raid_disks != info->raid_disks)
4195 rv = update_raid_disks(mddev, info->raid_disks);
4196
36fa3063
N		 4197 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4198 if (mddev->pers->quiesce == NULL)
4199 return -EINVAL;
4200 if (mddev->recovery || mddev->sync_thread)
4201 return -EBUSY;
4202 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4203 /* add the bitmap */
4204 if (mddev->bitmap)
4205 return -EEXIST;
4206 if (mddev->default_bitmap_offset == 0)
4207 return -EINVAL;
4208 mddev->bitmap_offset = mddev->default_bitmap_offset;
4209 mddev->pers->quiesce(mddev, 1);
4210 rv = bitmap_create(mddev);
4211 if (rv)
4212 bitmap_destroy(mddev);
4213 mddev->pers->quiesce(mddev, 0);
4214 } else {
4215 /* remove the bitmap */
4216 if (!mddev->bitmap)
4217 return -ENOENT;
4218 if (mddev->bitmap->file)
4219 return -EINVAL;
4220 mddev->pers->quiesce(mddev, 1);
4221 bitmap_destroy(mddev);
4222 mddev->pers->quiesce(mddev, 0);
4223 mddev->bitmap_offset = 0;
4224 }
4225 }
850b2b42 4226 md_update_sb(mddev, 1);
1da177e4
LT		 4227 return rv;
4228}
4229
4230static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4231{
4232 mdk_rdev_t *rdev;
4233
4234 if (mddev->pers == NULL)
4235 return -ENODEV;
4236
4237 rdev = find_rdev(mddev, dev);
4238 if (!rdev)
4239 return -ENODEV;
4240
4241 md_error(mddev, rdev);
4242 return 0;
4243}
4244
a885c8c4
CH		 4245static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4246{
4247 mddev_t *mddev = bdev->bd_disk->private_data;
4248
4249 geo->heads = 2;
4250 geo->sectors = 4;
4251 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4252 return 0;
4253}
4254
1da177e4
LT		 4255static int md_ioctl(struct inode *inode, struct file *file,
4256 unsigned int cmd, unsigned long arg)
4257{
4258 int err = 0;
4259 void __user *argp = (void __user *)arg;
1da177e4
LT		 4260 mddev_t *mddev = NULL;
4261
4262 if (!capable(CAP_SYS_ADMIN))
4263 return -EACCES;
4264
4265 /*
4266 * Commands dealing with the RAID driver but not any
4267 * particular array:
4268 */
4269 switch (cmd)
4270 {
4271 case RAID_VERSION:
4272 err = get_version(argp);
4273 goto done;
4274
4275 case PRINT_RAID_DEBUG:
4276 err = 0;
4277 md_print_devices();
4278 goto done;
4279
4280#ifndef MODULE
4281 case RAID_AUTORUN:
4282 err = 0;
4283 autostart_arrays(arg);
4284 goto done;
4285#endif
4286 default:;
4287 }
4288
4289 /*
4290 * Commands creating/starting a new array:
4291 */
4292
4293 mddev = inode->i_bdev->bd_disk->private_data;
4294
4295 if (!mddev) {
4296 BUG();
4297 goto abort;
4298 }
4299
1da177e4
LT		 4300 err = mddev_lock(mddev);
4301 if (err) {
4302 printk(KERN_INFO
4303 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4304 err, cmd);
4305 goto abort;
4306 }
4307
4308 switch (cmd)
4309 {
4310 case SET_ARRAY_INFO:
4311 {
4312 mdu_array_info_t info;
4313 if (!arg)
4314 memset(&info, 0, sizeof(info));
4315 else if (copy_from_user(&info, argp, sizeof(info))) {
4316 err = -EFAULT;
4317 goto abort_unlock;
4318 }
4319 if (mddev->pers) {
4320 err = update_array_info(mddev, &info);
4321 if (err) {
4322 printk(KERN_WARNING "md: couldn't update"
4323 " array info. %d\n", err);
4324 goto abort_unlock;
4325 }
4326 goto done_unlock;
4327 }
4328 if (!list_empty(&mddev->disks)) {
4329 printk(KERN_WARNING
4330 "md: array %s already has disks!\n",
4331 mdname(mddev));
4332 err = -EBUSY;
4333 goto abort_unlock;
4334 }
4335 if (mddev->raid_disks) {
4336 printk(KERN_WARNING
4337 "md: array %s already initialised!\n",
4338 mdname(mddev));
4339 err = -EBUSY;
4340 goto abort_unlock;
4341 }
4342 err = set_array_info(mddev, &info);
4343 if (err) {
4344 printk(KERN_WARNING "md: couldn't set"
4345 " array info. %d\n", err);
4346 goto abort_unlock;
4347 }
4348 }
4349 goto done_unlock;
4350
4351 default:;
4352 }
4353
4354 /*
4355 * Commands querying/configuring an existing array:
4356 */
32a7627c 4357 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3f9d7b0d 4358 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
32a7627c 4359 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3f9d7b0d
N		 4360 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4361 && cmd != GET_BITMAP_FILE) {
1da177e4
LT		 4362 err = -ENODEV;
4363 goto abort_unlock;
4364 }
4365
4366 /*
4367 * Commands even a read-only array can execute:
4368 */
4369 switch (cmd)
4370 {
4371 case GET_ARRAY_INFO:
4372 err = get_array_info(mddev, argp);
4373 goto done_unlock;
4374
32a7627c 4375 case GET_BITMAP_FILE:
87162a28 4376 err = get_bitmap_file(mddev, argp);
32a7627c
N		 4377 goto done_unlock;
4378
1da177e4
LT		 4379 case GET_DISK_INFO:
4380 err = get_disk_info(mddev, argp);
4381 goto done_unlock;
4382
4383 case RESTART_ARRAY_RW:
4384 err = restart_array(mddev);
4385 goto done_unlock;
4386
4387 case STOP_ARRAY:
4388 err = do_md_stop (mddev, 0);
4389 goto done_unlock;
4390
4391 case STOP_ARRAY_RO:
4392 err = do_md_stop (mddev, 1);
4393 goto done_unlock;
4394
4395 /*
4396 * We have a problem here : there is no easy way to give a CHS
4397 * virtual geometry. We currently pretend that we have a 2 heads
4398 * 4 sectors (with a BIG number of cylinders...). This drives
4399 * dosfs just mad... ;-)
4400 */
1da177e4
LT		 4401 }
4402
4403 /*
4404 * The remaining ioctls are changing the state of the
f91de92e
N		 4405 * superblock, so we do not allow them on read-only arrays.
4406 * However non-MD ioctls (e.g. get-size) will still come through
4407 * here and hit the 'default' below, so only disallow
4408 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 4409 */
f91de92e
N		 4410 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4411 mddev->ro && mddev->pers) {
4412 if (mddev->ro == 2) {
4413 mddev->ro = 0;
4414 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4415 md_wakeup_thread(mddev->thread);
4416
4417 } else {
4418 err = -EROFS;
4419 goto abort_unlock;
4420 }
1da177e4
LT		 4421 }
4422
4423 switch (cmd)
4424 {
4425 case ADD_NEW_DISK:
4426 {
4427 mdu_disk_info_t info;
4428 if (copy_from_user(&info, argp, sizeof(info)))
4429 err = -EFAULT;
4430 else
4431 err = add_new_disk(mddev, &info);
4432 goto done_unlock;
4433 }
4434
4435 case HOT_REMOVE_DISK:
4436 err = hot_remove_disk(mddev, new_decode_dev(arg));
4437 goto done_unlock;
4438
4439 case HOT_ADD_DISK:
4440 err = hot_add_disk(mddev, new_decode_dev(arg));
4441 goto done_unlock;
4442
4443 case SET_DISK_FAULTY:
4444 err = set_disk_faulty(mddev, new_decode_dev(arg));
4445 goto done_unlock;
4446
4447 case RUN_ARRAY:
4448 err = do_md_run (mddev);
4449 goto done_unlock;
4450
32a7627c
N		 4451 case SET_BITMAP_FILE:
4452 err = set_bitmap_file(mddev, (int)arg);
4453 goto done_unlock;
4454
1da177e4 4455 default:
1da177e4
LT		 4456 err = -EINVAL;
4457 goto abort_unlock;
4458 }
4459
4460done_unlock:
4461abort_unlock:
4462 mddev_unlock(mddev);
4463
4464 return err;
4465done:
4466 if (err)
4467 MD_BUG();
4468abort:
4469 return err;
4470}
4471
4472static int md_open(struct inode *inode, struct file *file)
4473{
4474 /*
4475 * Succeed if we can lock the mddev, which confirms that
4476 * it isn't being stopped right now.
4477 */
4478 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4479 int err;
4480
d63a5a74 4481 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
1da177e4
LT		 4482 goto out;
4483
4484 err = 0;
4485 mddev_get(mddev);
4486 mddev_unlock(mddev);
4487
4488 check_disk_change(inode->i_bdev);
4489 out:
4490 return err;
4491}
4492
4493static int md_release(struct inode *inode, struct file * file)
4494{
4495 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4496
52e5f9d1 4497 BUG_ON(!mddev);
1da177e4
LT		 4498 mddev_put(mddev);
4499
4500 return 0;
4501}
4502
4503static int md_media_changed(struct gendisk *disk)
4504{
4505 mddev_t *mddev = disk->private_data;
4506
4507 return mddev->changed;
4508}
4509
4510static int md_revalidate(struct gendisk *disk)
4511{
4512 mddev_t *mddev = disk->private_data;
4513
4514 mddev->changed = 0;
4515 return 0;
4516}
4517static struct block_device_operations md_fops =
4518{
4519 .owner = THIS_MODULE,
4520 .open = md_open,
4521 .release = md_release,
4522 .ioctl = md_ioctl,
a885c8c4 4523 .getgeo = md_getgeo,
1da177e4
LT		 4524 .media_changed = md_media_changed,
4525 .revalidate_disk= md_revalidate,
4526};
4527
75c96f85 4528static int md_thread(void * arg)
1da177e4
LT		 4529{
4530 mdk_thread_t *thread = arg;
4531
1da177e4
LT		 4532 /*
4533 * md_thread is a 'system-thread', it's priority should be very
4534 * high. We avoid resource deadlocks individually in each
4535 * raid personality. (RAID5 does preallocation) We also use RR and
4536 * the very same RT priority as kswapd, thus we will never get
4537 * into a priority inversion deadlock.
4538 *
4539 * we definitely have to have equal or higher priority than
4540 * bdflush, otherwise bdflush will deadlock if there are too
4541 * many dirty RAID5 blocks.
4542 */
1da177e4 4543
4b438a23 4544 current->flags |= PF_NOFREEZE;
6985c43f 4545 allow_signal(SIGKILL);
a6fb0934 4546 while (!kthread_should_stop()) {
1da177e4 4547
93588e22
N		 4548 /* We need to wait INTERRUPTIBLE so that
4549 * we don't add to the load-average.
4550 * That means we need to be sure no signals are
4551 * pending
4552 */
4553 if (signal_pending(current))
4554 flush_signals(current);
4555
4556 wait_event_interruptible_timeout
4557 (thread->wqueue,
4558 test_bit(THREAD_WAKEUP, &thread->flags)
4559 || kthread_should_stop(),
4560 thread->timeout);
1da177e4
LT		 4561
4562 clear_bit(THREAD_WAKEUP, &thread->flags);
4563
787453c2 4564 thread->run(thread->mddev);
1da177e4 4565 }
a6fb0934 4566
1da177e4
LT		 4567 return 0;
4568}
4569
4570void md_wakeup_thread(mdk_thread_t *thread)
4571{
4572 if (thread) {
4573 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4574 set_bit(THREAD_WAKEUP, &thread->flags);
4575 wake_up(&thread->wqueue);
4576 }
4577}
4578
4579mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4580 const char *name)
4581{
4582 mdk_thread_t *thread;
1da177e4 4583
9ffae0cf 4584 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 4585 if (!thread)
4586 return NULL;
4587
1da177e4
LT		 4588 init_waitqueue_head(&thread->wqueue);
4589
1da177e4
LT		 4590 thread->run = run;
4591 thread->mddev = mddev;
32a7627c 4592 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 4593 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 4594 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 4595 kfree(thread);
4596 return NULL;
4597 }
1da177e4
LT		 4598 return thread;
4599}
4600
1da177e4
LT		 4601void md_unregister_thread(mdk_thread_t *thread)
4602{
d28446fe 4603 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
a6fb0934
N		 4604
4605 kthread_stop(thread->tsk);
1da177e4
LT		 4606 kfree(thread);
4607}
4608
4609void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4610{
4611 if (!mddev) {
4612 MD_BUG();
4613 return;
4614 }
4615
b2d444d7 4616 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 4617 return;
32a7627c 4618/*
1da177e4
LT		 4619 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4620 mdname(mddev),
4621 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4622 __builtin_return_address(0),__builtin_return_address(1),
4623 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 4624*/
d0a0a5ee
AM		 4625 if (!mddev->pers)
4626 return;
1da177e4
LT		 4627 if (!mddev->pers->error_handler)
4628 return;
4629 mddev->pers->error_handler(mddev,rdev);
4630 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4631 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4632 md_wakeup_thread(mddev->thread);
c331eb04 4633 md_new_event_inintr(mddev);
1da177e4
LT		 4634}
4635
4636/* seq_file implementation /proc/mdstat */
4637
4638static void status_unused(struct seq_file *seq)
4639{
4640 int i = 0;
4641 mdk_rdev_t *rdev;
4642 struct list_head *tmp;
4643
4644 seq_printf(seq, "unused devices: ");
4645
4646 ITERATE_RDEV_PENDING(rdev,tmp) {
4647 char b[BDEVNAME_SIZE];
4648 i++;
4649 seq_printf(seq, "%s ",
4650 bdevname(rdev->bdev,b));
4651 }
4652 if (!i)
4653 seq_printf(seq, "<none>");
4654
4655 seq_printf(seq, "\n");
4656}
4657
4658
4659static void status_resync(struct seq_file *seq, mddev_t * mddev)
4660{
4588b42e
N		 4661 sector_t max_blocks, resync, res;
4662 unsigned long dt, db, rt;
4663 int scale;
4664 unsigned int per_milli;
1da177e4
LT		 4665
4666 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4667
4668 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4669 max_blocks = mddev->resync_max_sectors >> 1;
4670 else
4671 max_blocks = mddev->size;
4672
4673 /*
4674 * Should not happen.
4675 */
4676 if (!max_blocks) {
4677 MD_BUG();
4678 return;
4679 }
4588b42e
N		 4680 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4681 * in a sector_t, and (max_blocks>>scale) will fit in a
4682 * u32, as those are the requirements for sector_div.
4683 * Thus 'scale' must be at least 10
4684 */
4685 scale = 10;
4686 if (sizeof(sector_t) > sizeof(unsigned long)) {
4687 while ( max_blocks/2 > (1ULL<<(scale+32)))
4688 scale++;
4689 }
4690 res = (resync>>scale)*1000;
4691 sector_div(res, (u32)((max_blocks>>scale)+1));
4692
4693 per_milli = res;
1da177e4 4694 {
4588b42e 4695 int i, x = per_milli/50, y = 20-x;
1da177e4
LT		 4696 seq_printf(seq, "[");
4697 for (i = 0; i < x; i++)
4698 seq_printf(seq, "=");
4699 seq_printf(seq, ">");
4700 for (i = 0; i < y; i++)
4701 seq_printf(seq, ".");
4702 seq_printf(seq, "] ");
4703 }
4588b42e 4704 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
ccfcc3c1
N		 4705 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
4706 "reshape" :
61df9d91
N		 4707 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
4708 "check" :
4709 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4710 "resync" : "recovery"))),
4711 per_milli/10, per_milli % 10,
4588b42e
N		 4712 (unsigned long long) resync,
4713 (unsigned long long) max_blocks);
1da177e4
LT		 4714
4715 /*
4716 * We do not want to overflow, so the order of operands and
4717 * the * 100 / 100 trick are important. We do a +1 to be
4718 * safe against division by zero. We only estimate anyway.
4719 *
4720 * dt: time from mark until now
4721 * db: blocks written from mark until now
4722 * rt: remaining time
4723 */
4724 dt = ((jiffies - mddev->resync_mark) / HZ);
4725 if (!dt) dt++;
ff4e8d9a
N		 4726 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
4727 - mddev->resync_mark_cnt;
4728 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
1da177e4
LT		 4729
4730 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4731
ff4e8d9a 4732 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
1da177e4
LT		 4733}
4734
4735static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4736{
4737 struct list_head *tmp;
4738 loff_t l = *pos;
4739 mddev_t *mddev;
4740
4741 if (l >= 0x10000)
4742 return NULL;
4743 if (!l--)
4744 /* header */
4745 return (void*)1;
4746
4747 spin_lock(&all_mddevs_lock);
4748 list_for_each(tmp,&all_mddevs)
4749 if (!l--) {
4750 mddev = list_entry(tmp, mddev_t, all_mddevs);
4751 mddev_get(mddev);
4752 spin_unlock(&all_mddevs_lock);
4753 return mddev;
4754 }
4755 spin_unlock(&all_mddevs_lock);
4756 if (!l--)
4757 return (void*)2;/* tail */
4758 return NULL;
4759}
4760
4761static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4762{
4763 struct list_head *tmp;
4764 mddev_t *next_mddev, *mddev = v;
4765
4766 ++*pos;
4767 if (v == (void*)2)
4768 return NULL;
4769
4770 spin_lock(&all_mddevs_lock);
4771 if (v == (void*)1)
4772 tmp = all_mddevs.next;
4773 else
4774 tmp = mddev->all_mddevs.next;
4775 if (tmp != &all_mddevs)
4776 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4777 else {
4778 next_mddev = (void*)2;
4779 *pos = 0x10000;
4780 }
4781 spin_unlock(&all_mddevs_lock);
4782
4783 if (v != (void*)1)
4784 mddev_put(mddev);
4785 return next_mddev;
4786
4787}
4788
4789static void md_seq_stop(struct seq_file *seq, void *v)
4790{
4791 mddev_t *mddev = v;
4792
4793 if (mddev && v != (void*)1 && v != (void*)2)
4794 mddev_put(mddev);
4795}
4796
d7603b7e
N		 4797struct mdstat_info {
4798 int event;
4799};
4800
1da177e4
LT		 4801static int md_seq_show(struct seq_file *seq, void *v)
4802{
4803 mddev_t *mddev = v;
4804 sector_t size;
4805 struct list_head *tmp2;
4806 mdk_rdev_t *rdev;
d7603b7e 4807 struct mdstat_info *mi = seq->private;
32a7627c 4808 struct bitmap *bitmap;
1da177e4
LT		 4809
4810 if (v == (void*)1) {
2604b703 4811 struct mdk_personality *pers;
1da177e4
LT		 4812 seq_printf(seq, "Personalities : ");
4813 spin_lock(&pers_lock);
2604b703
N		 4814 list_for_each_entry(pers, &pers_list, list)
4815 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT		 4816
4817 spin_unlock(&pers_lock);
4818 seq_printf(seq, "\n");
d7603b7e 4819 mi->event = atomic_read(&md_event_count);
1da177e4
LT		 4820 return 0;
4821 }
4822 if (v == (void*)2) {
4823 status_unused(seq);
4824 return 0;
4825 }
4826
5dc5cf7d 4827 if (mddev_lock(mddev) < 0)
1da177e4 4828 return -EINTR;
5dc5cf7d 4829
1da177e4
LT		 4830 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4831 seq_printf(seq, "%s : %sactive", mdname(mddev),
4832 mddev->pers ? "" : "in");
4833 if (mddev->pers) {
f91de92e 4834 if (mddev->ro==1)
1da177e4 4835 seq_printf(seq, " (read-only)");
f91de92e
N		 4836 if (mddev->ro==2)
4837 seq_printf(seq, "(auto-read-only)");
1da177e4
LT		 4838 seq_printf(seq, " %s", mddev->pers->name);
4839 }
4840
4841 size = 0;
4842 ITERATE_RDEV(mddev,rdev,tmp2) {
4843 char b[BDEVNAME_SIZE];
4844 seq_printf(seq, " %s[%d]",
4845 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 4846 if (test_bit(WriteMostly, &rdev->flags))
4847 seq_printf(seq, "(W)");
b2d444d7 4848 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4849 seq_printf(seq, "(F)");
4850 continue;
b325a32e
N		 4851 } else if (rdev->raid_disk < 0)
4852 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 4853 size += rdev->size;
4854 }
4855
4856 if (!list_empty(&mddev->disks)) {
4857 if (mddev->pers)
4858 seq_printf(seq, "\n %llu blocks",
4859 (unsigned long long)mddev->array_size);
4860 else
4861 seq_printf(seq, "\n %llu blocks",
4862 (unsigned long long)size);
4863 }
1cd6bf19
N		 4864 if (mddev->persistent) {
4865 if (mddev->major_version != 0 ||
4866 mddev->minor_version != 90) {
4867 seq_printf(seq," super %d.%d",
4868 mddev->major_version,
4869 mddev->minor_version);
4870 }
4871 } else
4872 seq_printf(seq, " super non-persistent");
1da177e4
LT		 4873
4874 if (mddev->pers) {
4875 mddev->pers->status (seq, mddev);
4876 seq_printf(seq, "\n ");
8e1b39d6
N		 4877 if (mddev->pers->sync_request) {
4878 if (mddev->curr_resync > 2) {
4879 status_resync (seq, mddev);
4880 seq_printf(seq, "\n ");
4881 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4882 seq_printf(seq, "\tresync=DELAYED\n ");
4883 else if (mddev->recovery_cp < MaxSector)
4884 seq_printf(seq, "\tresync=PENDING\n ");
4885 }
32a7627c
N		 4886 } else
4887 seq_printf(seq, "\n ");
4888
4889 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 4890 unsigned long chunk_kb;
4891 unsigned long flags;
32a7627c
N		 4892 spin_lock_irqsave(&bitmap->lock, flags);
4893 chunk_kb = bitmap->chunksize >> 10;
4894 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
4895 "%lu%s chunk",
4896 bitmap->pages - bitmap->missing_pages,
4897 bitmap->pages,
4898 (bitmap->pages - bitmap->missing_pages)
4899 << (PAGE_SHIFT - 10),
4900 chunk_kb ? chunk_kb : bitmap->chunksize,
4901 chunk_kb ? "KB" : "B");
78d742d8
N		 4902 if (bitmap->file) {
4903 seq_printf(seq, ", file: ");
c649bb9c
JS		 4904 seq_path(seq, bitmap->file->f_path.mnt,
4905 bitmap->file->f_path.dentry," \t\n");
32a7627c 4906 }
78d742d8 4907
32a7627c
N		 4908 seq_printf(seq, "\n");
4909 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 4910 }
4911
4912 seq_printf(seq, "\n");
4913 }
4914 mddev_unlock(mddev);
4915
4916 return 0;
4917}
4918
4919static struct seq_operations md_seq_ops = {
4920 .start = md_seq_start,
4921 .next = md_seq_next,
4922 .stop = md_seq_stop,
4923 .show = md_seq_show,
4924};
4925
4926static int md_seq_open(struct inode *inode, struct file *file)
4927{
4928 int error;
d7603b7e
N		 4929 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
4930 if (mi == NULL)
4931 return -ENOMEM;
1da177e4
LT		 4932
4933 error = seq_open(file, &md_seq_ops);
d7603b7e
N		 4934 if (error)
4935 kfree(mi);
4936 else {
4937 struct seq_file *p = file->private_data;
4938 p->private = mi;
4939 mi->event = atomic_read(&md_event_count);
4940 }
1da177e4
LT		 4941 return error;
4942}
4943
d7603b7e
N		 4944static int md_seq_release(struct inode *inode, struct file *file)
4945{
4946 struct seq_file *m = file->private_data;
4947 struct mdstat_info *mi = m->private;
4948 m->private = NULL;
4949 kfree(mi);
4950 return seq_release(inode, file);
4951}
4952
4953static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
4954{
4955 struct seq_file *m = filp->private_data;
4956 struct mdstat_info *mi = m->private;
4957 int mask;
4958
4959 poll_wait(filp, &md_event_waiters, wait);
4960
4961 /* always allow read */
4962 mask = POLLIN | POLLRDNORM;
4963
4964 if (mi->event != atomic_read(&md_event_count))
4965 mask |= POLLERR | POLLPRI;
4966 return mask;
4967}
4968
fa027c2a 4969static const struct file_operations md_seq_fops = {
e24650c2 4970 .owner = THIS_MODULE,
1da177e4
LT		 4971 .open = md_seq_open,
4972 .read = seq_read,
4973 .llseek = seq_lseek,
d7603b7e
N		 4974 .release = md_seq_release,
4975 .poll = mdstat_poll,
1da177e4
LT		 4976};
4977
2604b703 4978int register_md_personality(struct mdk_personality *p)
1da177e4 4979{
1da177e4 4980 spin_lock(&pers_lock);
2604b703
N		 4981 list_add_tail(&p->list, &pers_list);
4982 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
1da177e4
LT		 4983 spin_unlock(&pers_lock);
4984 return 0;
4985}
4986
2604b703 4987int unregister_md_personality(struct mdk_personality *p)
1da177e4 4988{
2604b703 4989 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 4990 spin_lock(&pers_lock);
2604b703 4991 list_del_init(&p->list);
1da177e4
LT		 4992 spin_unlock(&pers_lock);
4993 return 0;
4994}
4995
4996static int is_mddev_idle(mddev_t *mddev)
4997{
4998 mdk_rdev_t * rdev;
4999 struct list_head *tmp;
5000 int idle;
5001 unsigned long curr_events;
5002
5003 idle = 1;
5004 ITERATE_RDEV(mddev,rdev,tmp) {
5005 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 5006 curr_events = disk_stat_read(disk, sectors[0]) +
5007 disk_stat_read(disk, sectors[1]) -
1da177e4 5008 atomic_read(&disk->sync_io);
c0e48521
N		 5009 /* The difference between curr_events and last_events
5010 * will be affected by any new non-sync IO (making
5011 * curr_events bigger) and any difference in the amount of
5012 * in-flight syncio (making current_events bigger or smaller)
5013 * The amount in-flight is currently limited to
5014 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
5015 * which is at most 4096 sectors.
5016 * These numbers are fairly fragile and should be made
5017 * more robust, probably by enforcing the
5018 * 'window size' that md_do_sync sort-of uses.
5019 *
1da177e4
LT		 5020 * Note: the following is an unsigned comparison.
5021 */
c0e48521 5022 if ((curr_events - rdev->last_events + 4096) > 8192) {
1da177e4
LT		 5023 rdev->last_events = curr_events;
5024 idle = 0;
5025 }
5026 }
5027 return idle;
5028}
5029
5030void md_done_sync(mddev_t *mddev, int blocks, int ok)
5031{
5032 /* another "blocks" (512byte) blocks have been synced */
5033 atomic_sub(blocks, &mddev->recovery_active);
5034 wake_up(&mddev->recovery_wait);
5035 if (!ok) {
5036 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5037 md_wakeup_thread(mddev->thread);
5038 // stop recovery, signal do_sync ....
5039 }
5040}
5041
5042
06d91a5f
N		 5043/* md_write_start(mddev, bi)
5044 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 5045 * in superblock) before writing, schedule a superblock update
5046 * and wait for it to complete.
06d91a5f 5047 */
3d310eb7 5048void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 5049{
06d91a5f 5050 if (bio_data_dir(bi) != WRITE)
3d310eb7 5051 return;
06d91a5f 5052
f91de92e
N		 5053 BUG_ON(mddev->ro == 1);
5054 if (mddev->ro == 2) {
5055 /* need to switch to read/write */
5056 mddev->ro = 0;
5057 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5058 md_wakeup_thread(mddev->thread);
5059 }
06d91a5f 5060 atomic_inc(&mddev->writes_pending);
06d91a5f 5061 if (mddev->in_sync) {
a9701a30 5062 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 5063 if (mddev->in_sync) {
5064 mddev->in_sync = 0;
850b2b42 5065 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3d310eb7
N		 5066 md_wakeup_thread(mddev->thread);
5067 }
a9701a30 5068 spin_unlock_irq(&mddev->write_lock);
06d91a5f 5069 }
850b2b42 5070 wait_event(mddev->sb_wait, mddev->flags==0);
1da177e4
LT		 5071}
5072
5073void md_write_end(mddev_t *mddev)
5074{
5075 if (atomic_dec_and_test(&mddev->writes_pending)) {
5076 if (mddev->safemode == 2)
5077 md_wakeup_thread(mddev->thread);
16f17b39 5078 else if (mddev->safemode_delay)
1da177e4
LT		 5079 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5080 }
5081}
5082
2a2275d6
N		 5083/* md_allow_write(mddev)
5084 * Calling this ensures that the array is marked 'active' so that writes
5085 * may proceed without blocking. It is important to call this before
5086 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5087 * Must be called with mddev_lock held.
5088 */
5089void md_allow_write(mddev_t *mddev)
5090{
5091 if (!mddev->pers)
5092 return;
5093 if (mddev->ro)
5094 return;
5095
5096 spin_lock_irq(&mddev->write_lock);
5097 if (mddev->in_sync) {
5098 mddev->in_sync = 0;
5099 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5100 if (mddev->safemode_delay &&
5101 mddev->safemode == 0)
5102 mddev->safemode = 1;
5103 spin_unlock_irq(&mddev->write_lock);
5104 md_update_sb(mddev, 0);
5105 } else
5106 spin_unlock_irq(&mddev->write_lock);
5107}
5108EXPORT_SYMBOL_GPL(md_allow_write);
5109
75c96f85 5110static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
1da177e4
LT		 5111
5112#define SYNC_MARKS 10
5113#define SYNC_MARK_STEP (3*HZ)
29269553 5114void md_do_sync(mddev_t *mddev)
1da177e4
LT		 5115{
5116 mddev_t *mddev2;
5117 unsigned int currspeed = 0,
5118 window;
57afd89f 5119 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 5120 unsigned long mark[SYNC_MARKS];
5121 sector_t mark_cnt[SYNC_MARKS];
5122 int last_mark,m;
5123 struct list_head *tmp;
5124 sector_t last_check;
57afd89f 5125 int skipped = 0;
5fd6c1dc
N		 5126 struct list_head *rtmp;
5127 mdk_rdev_t *rdev;
61df9d91 5128 char *desc;
1da177e4
LT		 5129
5130 /* just incase thread restarts... */
5131 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5132 return;
5fd6c1dc
N		 5133 if (mddev->ro) /* never try to sync a read-only array */
5134 return;
1da177e4 5135
61df9d91
N		 5136 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5137 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5138 desc = "data-check";
5139 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5140 desc = "requested-resync";
5141 else
5142 desc = "resync";
5143 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5144 desc = "reshape";
5145 else
5146 desc = "recovery";
5147
1da177e4
LT		 5148 /* we overload curr_resync somewhat here.
5149 * 0 == not engaged in resync at all
5150 * 2 == checking that there is no conflict with another sync
5151 * 1 == like 2, but have yielded to allow conflicting resync to
5152 * commense
5153 * other == active in resync - this many blocks
5154 *
5155 * Before starting a resync we must have set curr_resync to
5156 * 2, and then checked that every "conflicting" array has curr_resync
5157 * less than ours. When we find one that is the same or higher
5158 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5159 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5160 * This will mean we have to start checking from the beginning again.
5161 *
5162 */
5163
5164 do {
5165 mddev->curr_resync = 2;
5166
5167 try_again:
787453c2 5168 if (kthread_should_stop()) {
6985c43f 5169 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 5170 goto skip;
5171 }
5172 ITERATE_MDDEV(mddev2,tmp) {
1da177e4
LT		 5173 if (mddev2 == mddev)
5174 continue;
5175 if (mddev2->curr_resync &&
5176 match_mddev_units(mddev,mddev2)) {
5177 DEFINE_WAIT(wq);
5178 if (mddev < mddev2 && mddev->curr_resync == 2) {
5179 /* arbitrarily yield */
5180 mddev->curr_resync = 1;
5181 wake_up(&resync_wait);
5182 }
5183 if (mddev > mddev2 && mddev->curr_resync == 1)
5184 /* no need to wait here, we can wait the next
5185 * time 'round when curr_resync == 2
5186 */
5187 continue;
787453c2
N		 5188 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5189 if (!kthread_should_stop() &&
8712e553 5190 mddev2->curr_resync >= mddev->curr_resync) {
61df9d91
N		 5191 printk(KERN_INFO "md: delaying %s of %s"
5192 " until %s has finished (they"
1da177e4 5193 " share one or more physical units)\n",
61df9d91 5194 desc, mdname(mddev), mdname(mddev2));
1da177e4
LT		 5195 mddev_put(mddev2);
5196 schedule();
5197 finish_wait(&resync_wait, &wq);
5198 goto try_again;
5199 }
5200 finish_wait(&resync_wait, &wq);
5201 }
5202 }
5203 } while (mddev->curr_resync < 2);
5204
5fd6c1dc 5205 j = 0;
9d88883e 5206 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 5207 /* resync follows the size requested by the personality,
57afd89f 5208 * which defaults to physical size, but can be virtual size
1da177e4
LT		 5209 */
5210 max_sectors = mddev->resync_max_sectors;
9d88883e 5211 mddev->resync_mismatches = 0;
5fd6c1dc
N		 5212 /* we don't use the checkpoint if there's a bitmap */
5213 if (!mddev->bitmap &&
5214 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5215 j = mddev->recovery_cp;
ccfcc3c1
N		 5216 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5217 max_sectors = mddev->size << 1;
5fd6c1dc 5218 else {
1da177e4
LT		 5219 /* recovery follows the physical size of devices */
5220 max_sectors = mddev->size << 1;
5fd6c1dc
N		 5221 j = MaxSector;
5222 ITERATE_RDEV(mddev,rdev,rtmp)
5223 if (rdev->raid_disk >= 0 &&
5224 !test_bit(Faulty, &rdev->flags) &&
5225 !test_bit(In_sync, &rdev->flags) &&
5226 rdev->recovery_offset < j)
5227 j = rdev->recovery_offset;
5228 }
1da177e4 5229
61df9d91
N		 5230 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5231 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5232 " %d KB/sec/disk.\n", speed_min(mddev));
338cec32 5233 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
61df9d91
N		 5234 "(but not more than %d KB/sec) for %s.\n",
5235 speed_max(mddev), desc);
1da177e4
LT		 5236
5237 is_mddev_idle(mddev); /* this also initializes IO event counters */
5fd6c1dc 5238
57afd89f 5239 io_sectors = 0;
1da177e4
LT		 5240 for (m = 0; m < SYNC_MARKS; m++) {
5241 mark[m] = jiffies;
57afd89f 5242 mark_cnt[m] = io_sectors;
1da177e4
LT		 5243 }
5244 last_mark = 0;
5245 mddev->resync_mark = mark[last_mark];
5246 mddev->resync_mark_cnt = mark_cnt[last_mark];
5247
5248 /*
5249 * Tune reconstruction:
5250 */
5251 window = 32*(PAGE_SIZE/512);
5252 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5253 window/2,(unsigned long long) max_sectors/2);
5254
5255 atomic_set(&mddev->recovery_active, 0);
5256 init_waitqueue_head(&mddev->recovery_wait);
5257 last_check = 0;
5258
5259 if (j>2) {
5260 printk(KERN_INFO
61df9d91
N		 5261 "md: resuming %s of %s from checkpoint.\n",
5262 desc, mdname(mddev));
1da177e4
LT		 5263 mddev->curr_resync = j;
5264 }
5265
5266 while (j < max_sectors) {
57afd89f 5267 sector_t sectors;
1da177e4 5268
57afd89f
N		 5269 skipped = 0;
5270 sectors = mddev->pers->sync_request(mddev, j, &skipped,
88202a0c 5271 currspeed < speed_min(mddev));
57afd89f 5272 if (sectors == 0) {
1da177e4
LT		 5273 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5274 goto out;
5275 }
57afd89f
N		 5276
5277 if (!skipped) { /* actual IO requested */
5278 io_sectors += sectors;
5279 atomic_add(sectors, &mddev->recovery_active);
5280 }
5281
1da177e4
LT		 5282 j += sectors;
5283 if (j>1) mddev->curr_resync = j;
ff4e8d9a 5284 mddev->curr_mark_cnt = io_sectors;
d7603b7e
N		 5285 if (last_check == 0)
5286 /* this is the earliers that rebuilt will be
5287 * visible in /proc/mdstat
5288 */
5289 md_new_event(mddev);
57afd89f
N		 5290
5291 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 5292 continue;
5293
57afd89f 5294 last_check = io_sectors;
1da177e4
LT		 5295
5296 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
5297 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
5298 break;
5299
5300 repeat:
5301 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5302 /* step marks */
5303 int next = (last_mark+1) % SYNC_MARKS;
5304
5305 mddev->resync_mark = mark[next];
5306 mddev->resync_mark_cnt = mark_cnt[next];
5307 mark[next] = jiffies;
57afd89f 5308 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 5309 last_mark = next;
5310 }
5311
5312
787453c2 5313 if (kthread_should_stop()) {
1da177e4
LT		 5314 /*
5315 * got a signal, exit.
5316 */
5317 printk(KERN_INFO
5318 "md: md_do_sync() got signal ... exiting\n");
1da177e4
LT		 5319 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5320 goto out;
5321 }
5322
5323 /*
5324 * this loop exits only if either when we are slower than
5325 * the 'hard' speed limit, or the system was IO-idle for
5326 * a jiffy.
5327 * the system might be non-idle CPU-wise, but we only care
5328 * about not overloading the IO subsystem. (things like an
5329 * e2fsck being done on the RAID array should execute fast)
5330 */
5331 mddev->queue->unplug_fn(mddev->queue);
5332 cond_resched();
5333
57afd89f
N		 5334 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5335 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4 5336
88202a0c
N		 5337 if (currspeed > speed_min(mddev)) {
5338 if ((currspeed > speed_max(mddev)) ||
1da177e4 5339 !is_mddev_idle(mddev)) {
c0e48521 5340 msleep(500);
1da177e4
LT		 5341 goto repeat;
5342 }
5343 }
5344 }
61df9d91 5345 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
1da177e4
LT		 5346 /*
5347 * this also signals 'finished resyncing' to md_stop
5348 */
5349 out:
5350 mddev->queue->unplug_fn(mddev->queue);
5351
5352 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5353
5354 /* tell personality that we are finished */
57afd89f 5355 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 5356
5357 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
ccfcc3c1 5358 !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5fd6c1dc
N		 5359 mddev->curr_resync > 2) {
5360 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5361 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5362 if (mddev->curr_resync >= mddev->recovery_cp) {
5363 printk(KERN_INFO
61df9d91
N		 5364 "md: checkpointing %s of %s.\n",
5365 desc, mdname(mddev));
5fd6c1dc
N		 5366 mddev->recovery_cp = mddev->curr_resync;
5367 }
5368 } else
5369 mddev->recovery_cp = MaxSector;
5370 } else {
5371 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5372 mddev->curr_resync = MaxSector;
5373 ITERATE_RDEV(mddev,rdev,rtmp)
5374 if (rdev->raid_disk >= 0 &&
5375 !test_bit(Faulty, &rdev->flags) &&
5376 !test_bit(In_sync, &rdev->flags) &&
5377 rdev->recovery_offset < mddev->curr_resync)
5378 rdev->recovery_offset = mddev->curr_resync;
5fd6c1dc 5379 }
1da177e4 5380 }
17571284 5381 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 5382
1da177e4
LT		 5383 skip:
5384 mddev->curr_resync = 0;
5385 wake_up(&resync_wait);
5386 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5387 md_wakeup_thread(mddev->thread);
5388}
29269553 5389EXPORT_SYMBOL_GPL(md_do_sync);
1da177e4
LT		 5390
5391
b4c4c7b8
N		 5392static int remove_and_add_spares(mddev_t *mddev)
5393{
5394 mdk_rdev_t *rdev;
5395 struct list_head *rtmp;
5396 int spares = 0;
5397
5398 ITERATE_RDEV(mddev,rdev,rtmp)
5399 if (rdev->raid_disk >= 0 &&
5400 (test_bit(Faulty, &rdev->flags) ||
5401 ! test_bit(In_sync, &rdev->flags)) &&
5402 atomic_read(&rdev->nr_pending)==0) {
5403 if (mddev->pers->hot_remove_disk(
5404 mddev, rdev->raid_disk)==0) {
5405 char nm[20];
5406 sprintf(nm,"rd%d", rdev->raid_disk);
5407 sysfs_remove_link(&mddev->kobj, nm);
5408 rdev->raid_disk = -1;
5409 }
5410 }
5411
5412 if (mddev->degraded) {
5413 ITERATE_RDEV(mddev,rdev,rtmp)
5414 if (rdev->raid_disk < 0
5415 && !test_bit(Faulty, &rdev->flags)) {
5416 rdev->recovery_offset = 0;
5417 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5418 char nm[20];
5419 sprintf(nm, "rd%d", rdev->raid_disk);
5e55e2f5
N		 5420 if (sysfs_create_link(&mddev->kobj,
5421 &rdev->kobj, nm))
5422 printk(KERN_WARNING
5423 "md: cannot register "
5424 "%s for %s\n",
5425 nm, mdname(mddev));
b4c4c7b8
N		 5426 spares++;
5427 md_new_event(mddev);
5428 } else
5429 break;
5430 }
5431 }
5432 return spares;
5433}
1da177e4
LT		 5434/*
5435 * This routine is regularly called by all per-raid-array threads to
5436 * deal with generic issues like resync and super-block update.
5437 * Raid personalities that don't have a thread (linear/raid0) do not
5438 * need this as they never do any recovery or update the superblock.
5439 *
5440 * It does not do any resync itself, but rather "forks" off other threads
5441 * to do that as needed.
5442 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5443 * "->recovery" and create a thread at ->sync_thread.
5444 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5445 * and wakeups up this thread which will reap the thread and finish up.
5446 * This thread also removes any faulty devices (with nr_pending == 0).
5447 *
5448 * The overall approach is:
5449 * 1/ if the superblock needs updating, update it.
5450 * 2/ If a recovery thread is running, don't do anything else.
5451 * 3/ If recovery has finished, clean up, possibly marking spares active.
5452 * 4/ If there are any faulty devices, remove them.
5453 * 5/ If array is degraded, try to add spares devices
5454 * 6/ If array has spares or is not in-sync, start a resync thread.
5455 */
5456void md_check_recovery(mddev_t *mddev)
5457{
5458 mdk_rdev_t *rdev;
5459 struct list_head *rtmp;
5460
5461
5f40402d
N		 5462 if (mddev->bitmap)
5463 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 5464
5465 if (mddev->ro)
5466 return;
fca4d848
N		 5467
5468 if (signal_pending(current)) {
5469 if (mddev->pers->sync_request) {
5470 printk(KERN_INFO "md: %s in immediate safe mode\n",
5471 mdname(mddev));
5472 mddev->safemode = 2;
5473 }
5474 flush_signals(current);
5475 }
5476
1da177e4 5477 if ( ! (
850b2b42 5478 mddev->flags ||
1da177e4 5479 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848
N		 5480 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
5481 (mddev->safemode == 1) ||
5482 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5483 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 5484 ))
5485 return;
fca4d848 5486
df5b89b3 5487 if (mddev_trylock(mddev)) {
b4c4c7b8 5488 int spares = 0;
fca4d848 5489
a9701a30 5490 spin_lock_irq(&mddev->write_lock);
fca4d848
N		 5491 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
5492 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
5493 mddev->in_sync = 1;
850b2b42 5494 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
fca4d848
N		 5495 }
5496 if (mddev->safemode == 1)
5497 mddev->safemode = 0;
a9701a30 5498 spin_unlock_irq(&mddev->write_lock);
fca4d848 5499
850b2b42
N		 5500 if (mddev->flags)
5501 md_update_sb(mddev, 0);
06d91a5f 5502
06d91a5f 5503
1da177e4
LT		 5504 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
5505 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
5506 /* resync/recovery still happening */
5507 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5508 goto unlock;
5509 }
5510 if (mddev->sync_thread) {
5511 /* resync has finished, collect result */
5512 md_unregister_thread(mddev->sync_thread);
5513 mddev->sync_thread = NULL;
5514 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5515 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5516 /* success...*/
5517 /* activate any spares */
5518 mddev->pers->spare_active(mddev);
5519 }
850b2b42 5520 md_update_sb(mddev, 1);
41158c7e
N		 5521
5522 /* if array is no-longer degraded, then any saved_raid_disk
5523 * information must be scrapped
5524 */
5525 if (!mddev->degraded)
5526 ITERATE_RDEV(mddev,rdev,rtmp)
5527 rdev->saved_raid_disk = -1;
5528
1da177e4
LT		 5529 mddev->recovery = 0;
5530 /* flag recovery needed just to double check */
5531 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
d7603b7e 5532 md_new_event(mddev);
1da177e4
LT		 5533 goto unlock;
5534 }
24dd469d
N		 5535 /* Clear some bits that don't mean anything, but
5536 * might be left set
5537 */
5538 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5539 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
5540 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
5541 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4 5542
5fd6c1dc
N		 5543 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5544 goto unlock;
1da177e4
LT		 5545 /* no recovery is running.
5546 * remove any failed drives, then
5547 * add spares if possible.
5548 * Spare are also removed and re-added, to allow
5549 * the personality to fail the re-add.
5550 */
1da177e4 5551
b4c4c7b8
N		 5552 if (mddev->reshape_position != MaxSector) {
5553 if (mddev->pers->check_reshape(mddev) != 0)
5554 /* Cannot proceed */
5555 goto unlock;
5556 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
5557 } else if ((spares = remove_and_add_spares(mddev))) {
24dd469d
N		 5558 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5559 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5560 } else if (mddev->recovery_cp < MaxSector) {
5561 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5562 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5563 /* nothing to be done ... */
1da177e4 5564 goto unlock;
24dd469d 5565
1da177e4
LT		 5566 if (mddev->pers->sync_request) {
5567 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 5568 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
5569 /* We are adding a device or devices to an array
5570 * which has the bitmap stored on all devices.
5571 * So make sure all bitmap pages get written
5572 */
5573 bitmap_write_all(mddev->bitmap);
5574 }
1da177e4
LT		 5575 mddev->sync_thread = md_register_thread(md_do_sync,
5576 mddev,
5577 "%s_resync");
5578 if (!mddev->sync_thread) {
5579 printk(KERN_ERR "%s: could not start resync"
5580 " thread...\n",
5581 mdname(mddev));
5582 /* leave the spares where they are, it shouldn't hurt */
5583 mddev->recovery = 0;
d7603b7e 5584 } else
1da177e4 5585 md_wakeup_thread(mddev->sync_thread);
d7603b7e 5586 md_new_event(mddev);
1da177e4
LT		 5587 }
5588 unlock:
5589 mddev_unlock(mddev);
5590 }
5591}
5592
75c96f85
AB		 5593static int md_notify_reboot(struct notifier_block *this,
5594 unsigned long code, void *x)
1da177e4
LT		 5595{
5596 struct list_head *tmp;
5597 mddev_t *mddev;
5598
5599 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
5600
5601 printk(KERN_INFO "md: stopping all md devices.\n");
5602
5603 ITERATE_MDDEV(mddev,tmp)
c71d4887 5604 if (mddev_trylock(mddev)) {
1da177e4 5605 do_md_stop (mddev, 1);
c71d4887
NB		 5606 mddev_unlock(mddev);
5607 }
1da177e4
LT		 5608 /*
5609 * certain more exotic SCSI devices are known to be
5610 * volatile wrt too early system reboots. While the
5611 * right place to handle this issue is the given
5612 * driver, we do want to have a safe RAID driver ...
5613 */
5614 mdelay(1000*1);
5615 }
5616 return NOTIFY_DONE;
5617}
5618
75c96f85 5619static struct notifier_block md_notifier = {
1da177e4
LT		 5620 .notifier_call = md_notify_reboot,
5621 .next = NULL,
5622 .priority = INT_MAX, /* before any real devices */
5623};
5624
5625static void md_geninit(void)
5626{
5627 struct proc_dir_entry *p;
5628
5629 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5630
5631 p = create_proc_entry("mdstat", S_IRUGO, NULL);
5632 if (p)
5633 p->proc_fops = &md_seq_fops;
5634}
5635
75c96f85 5636static int __init md_init(void)
1da177e4 5637{
1da177e4
LT		 5638 if (register_blkdev(MAJOR_NR, "md"))
5639 return -1;
5640 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
5641 unregister_blkdev(MAJOR_NR, "md");
5642 return -1;
5643 }
e8703fe1
N		 5644 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
5645 md_probe, NULL, NULL);
5646 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
1da177e4
LT		 5647 md_probe, NULL, NULL);
5648
1da177e4 5649 register_reboot_notifier(&md_notifier);
0b4d4147 5650 raid_table_header = register_sysctl_table(raid_root_table);
1da177e4
LT		 5651
5652 md_geninit();
5653 return (0);
5654}
5655
5656
5657#ifndef MODULE
5658
5659/*
5660 * Searches all registered partitions for autorun RAID arrays
5661 * at boot time.
5662 */
5663static dev_t detected_devices[128];
5664static int dev_cnt;
5665
5666void md_autodetect_dev(dev_t dev)
5667{
5668 if (dev_cnt >= 0 && dev_cnt < 127)
5669 detected_devices[dev_cnt++] = dev;
5670}
5671
5672
5673static void autostart_arrays(int part)
5674{
5675 mdk_rdev_t *rdev;
5676 int i;
5677
5678 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
5679
5680 for (i = 0; i < dev_cnt; i++) {
5681 dev_t dev = detected_devices[i];
5682
5683 rdev = md_import_device(dev,0, 0);
5684 if (IS_ERR(rdev))
5685 continue;
5686
b2d444d7 5687 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 5688 MD_BUG();
5689 continue;
5690 }
5691 list_add(&rdev->same_set, &pending_raid_disks);
5692 }
5693 dev_cnt = 0;
5694
5695 autorun_devices(part);
5696}
5697
fdee8ae4 5698#endif /* !MODULE */
1da177e4
LT		 5699
5700static __exit void md_exit(void)
5701{
5702 mddev_t *mddev;
5703 struct list_head *tmp;
8ab5e4c1 5704
e8703fe1
N		 5705 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
5706 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
1da177e4
LT		 5707
5708 unregister_blkdev(MAJOR_NR,"md");
5709 unregister_blkdev(mdp_major, "mdp");
5710 unregister_reboot_notifier(&md_notifier);
5711 unregister_sysctl_table(raid_table_header);
5712 remove_proc_entry("mdstat", NULL);
5713 ITERATE_MDDEV(mddev,tmp) {
5714 struct gendisk *disk = mddev->gendisk;
5715 if (!disk)
5716 continue;
5717 export_array(mddev);
5718 del_gendisk(disk);
5719 put_disk(disk);
5720 mddev->gendisk = NULL;
5721 mddev_put(mddev);
5722 }
5723}
5724
5725module_init(md_init)
5726module_exit(md_exit)
5727
f91de92e
N		 5728static int get_ro(char *buffer, struct kernel_param *kp)
5729{
5730 return sprintf(buffer, "%d", start_readonly);
5731}
5732static int set_ro(const char *val, struct kernel_param *kp)
5733{
5734 char *e;
5735 int num = simple_strtoul(val, &e, 10);
5736 if (*val && (*e == '\0' || *e == '\n')) {
5737 start_readonly = num;
4dbcdc75 5738 return 0;
f91de92e
N		 5739 }
5740 return -EINVAL;
5741}
5742
80ca3a44
N		 5743module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
5744module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6ff8d8ec 5745
f91de92e 5746
1da177e4
LT		 5747EXPORT_SYMBOL(register_md_personality);
5748EXPORT_SYMBOL(unregister_md_personality);
5749EXPORT_SYMBOL(md_error);
5750EXPORT_SYMBOL(md_done_sync);
5751EXPORT_SYMBOL(md_write_start);
5752EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 5753EXPORT_SYMBOL(md_register_thread);
5754EXPORT_SYMBOL(md_unregister_thread);
5755EXPORT_SYMBOL(md_wakeup_thread);
1da177e4
LT		 5756EXPORT_SYMBOL(md_check_recovery);
5757MODULE_LICENSE("GPL");
aa1595e9 5758MODULE_ALIAS("md");
72008652 5759MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
kernel source for telekom puls (alcatel/mediatek)