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