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[PATCH] devfs: Remove the miscdevice devfs_name field as it's no longer needed
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / md / md.c
CommitLineData
1da177e4
LT		 1/*
2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
4
5 completely rewritten, based on the MD driver code from Marc Zyngier
6
7 Changes:
8
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
16
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
19
20 Neil Brown <neilb@cse.unsw.edu.au>.
21
32a7627c
N		 22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
24
1da177e4
LT		 25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
28 any later version.
29
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
33*/
34
35#include <linux/module.h>
36#include <linux/config.h>
a6fb0934 37#include <linux/kthread.h>
1da177e4
LT		 38#include <linux/linkage.h>
39#include <linux/raid/md.h>
32a7627c 40#include <linux/raid/bitmap.h>
1da177e4 41#include <linux/sysctl.h>
1da177e4
LT		 42#include <linux/buffer_head.h> /* for invalidate_bdev */
43#include <linux/suspend.h>
d7603b7e 44#include <linux/poll.h>
48c9c27b 45#include <linux/mutex.h>
16f17b39 46#include <linux/ctype.h>
1da177e4
LT		 47
48#include <linux/init.h>
49
32a7627c
N		 50#include <linux/file.h>
51
1da177e4
LT		 52#ifdef CONFIG_KMOD
53#include <linux/kmod.h>
54#endif
55
56#include <asm/unaligned.h>
57
58#define MAJOR_NR MD_MAJOR
59#define MD_DRIVER
60
61/* 63 partitions with the alternate major number (mdp) */
62#define MdpMinorShift 6
63
64#define DEBUG 0
65#define dprintk(x...) ((void)(DEBUG && printk(x)))
66
67
68#ifndef MODULE
69static void autostart_arrays (int part);
70#endif
71
2604b703 72static LIST_HEAD(pers_list);
1da177e4
LT		 73static DEFINE_SPINLOCK(pers_lock);
74
5e56341d
AB		 75static void md_print_devices(void);
76
77#define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
78
1da177e4
LT		 79/*
80 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
81 * is 1000 KB/sec, so the extra system load does not show up that much.
82 * Increase it if you want to have more _guaranteed_ speed. Note that
338cec32 83 * the RAID driver will use the maximum available bandwidth if the IO
1da177e4
LT		 84 * subsystem is idle. There is also an 'absolute maximum' reconstruction
85 * speed limit - in case reconstruction slows down your system despite
86 * idle IO detection.
87 *
88 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
88202a0c 89 * or /sys/block/mdX/md/sync_speed_{min,max}
1da177e4
LT		 90 */
91
92static int sysctl_speed_limit_min = 1000;
93static int sysctl_speed_limit_max = 200000;
88202a0c
N		 94static inline int speed_min(mddev_t *mddev)
95{
96 return mddev->sync_speed_min ?
97 mddev->sync_speed_min : sysctl_speed_limit_min;
98}
99
100static inline int speed_max(mddev_t *mddev)
101{
102 return mddev->sync_speed_max ?
103 mddev->sync_speed_max : sysctl_speed_limit_max;
104}
1da177e4
LT		 105
106static struct ctl_table_header *raid_table_header;
107
108static ctl_table raid_table[] = {
109 {
110 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
111 .procname = "speed_limit_min",
112 .data = &sysctl_speed_limit_min,
113 .maxlen = sizeof(int),
114 .mode = 0644,
115 .proc_handler = &proc_dointvec,
116 },
117 {
118 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
119 .procname = "speed_limit_max",
120 .data = &sysctl_speed_limit_max,
121 .maxlen = sizeof(int),
122 .mode = 0644,
123 .proc_handler = &proc_dointvec,
124 },
125 { .ctl_name = 0 }
126};
127
128static ctl_table raid_dir_table[] = {
129 {
130 .ctl_name = DEV_RAID,
131 .procname = "raid",
132 .maxlen = 0,
133 .mode = 0555,
134 .child = raid_table,
135 },
136 { .ctl_name = 0 }
137};
138
139static ctl_table raid_root_table[] = {
140 {
141 .ctl_name = CTL_DEV,
142 .procname = "dev",
143 .maxlen = 0,
144 .mode = 0555,
145 .child = raid_dir_table,
146 },
147 { .ctl_name = 0 }
148};
149
150static struct block_device_operations md_fops;
151
f91de92e
N		 152static int start_readonly;
153
d7603b7e
N		 154/*
155 * We have a system wide 'event count' that is incremented
156 * on any 'interesting' event, and readers of /proc/mdstat
157 * can use 'poll' or 'select' to find out when the event
158 * count increases.
159 *
160 * Events are:
161 * start array, stop array, error, add device, remove device,
162 * start build, activate spare
163 */
2989ddbd 164static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
d7603b7e 165static atomic_t md_event_count;
29269553 166void md_new_event(mddev_t *mddev)
d7603b7e
N		 167{
168 atomic_inc(&md_event_count);
169 wake_up(&md_event_waiters);
4508a7a7 170 sysfs_notify(&mddev->kobj, NULL, "sync_action");
d7603b7e 171}
29269553 172EXPORT_SYMBOL_GPL(md_new_event);
d7603b7e 173
c331eb04
N		 174/* Alternate version that can be called from interrupts
175 * when calling sysfs_notify isn't needed.
176 */
05381954 177static void md_new_event_inintr(mddev_t *mddev)
c331eb04
N		 178{
179 atomic_inc(&md_event_count);
180 wake_up(&md_event_waiters);
181}
182
1da177e4
LT		 183/*
184 * Enables to iterate over all existing md arrays
185 * all_mddevs_lock protects this list.
186 */
187static LIST_HEAD(all_mddevs);
188static DEFINE_SPINLOCK(all_mddevs_lock);
189
190
191/*
192 * iterates through all used mddevs in the system.
193 * We take care to grab the all_mddevs_lock whenever navigating
194 * the list, and to always hold a refcount when unlocked.
195 * Any code which breaks out of this loop while own
196 * a reference to the current mddev and must mddev_put it.
197 */
198#define ITERATE_MDDEV(mddev,tmp) \
199 \
200 for (({ spin_lock(&all_mddevs_lock); \
201 tmp = all_mddevs.next; \
202 mddev = NULL;}); \
203 ({ if (tmp != &all_mddevs) \
204 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
205 spin_unlock(&all_mddevs_lock); \
206 if (mddev) mddev_put(mddev); \
207 mddev = list_entry(tmp, mddev_t, all_mddevs); \
208 tmp != &all_mddevs;}); \
209 ({ spin_lock(&all_mddevs_lock); \
210 tmp = tmp->next;}) \
211 )
212
213
214static int md_fail_request (request_queue_t *q, struct bio *bio)
215{
216 bio_io_error(bio, bio->bi_size);
217 return 0;
218}
219
220static inline mddev_t *mddev_get(mddev_t *mddev)
221{
222 atomic_inc(&mddev->active);
223 return mddev;
224}
225
226static void mddev_put(mddev_t *mddev)
227{
228 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
229 return;
230 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
231 list_del(&mddev->all_mddevs);
926ce2d8 232 spin_unlock(&all_mddevs_lock);
1312f40e 233 blk_cleanup_queue(mddev->queue);
eae1701f 234 kobject_unregister(&mddev->kobj);
926ce2d8
N		 235 } else
236 spin_unlock(&all_mddevs_lock);
1da177e4
LT		 237}
238
239static mddev_t * mddev_find(dev_t unit)
240{
241 mddev_t *mddev, *new = NULL;
242
243 retry:
244 spin_lock(&all_mddevs_lock);
245 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
246 if (mddev->unit == unit) {
247 mddev_get(mddev);
248 spin_unlock(&all_mddevs_lock);
990a8baf 249 kfree(new);
1da177e4
LT		 250 return mddev;
251 }
252
253 if (new) {
254 list_add(&new->all_mddevs, &all_mddevs);
255 spin_unlock(&all_mddevs_lock);
256 return new;
257 }
258 spin_unlock(&all_mddevs_lock);
259
9ffae0cf 260 new = kzalloc(sizeof(*new), GFP_KERNEL);
1da177e4
LT		 261 if (!new)
262 return NULL;
263
1da177e4
LT		 264 new->unit = unit;
265 if (MAJOR(unit) == MD_MAJOR)
266 new->md_minor = MINOR(unit);
267 else
268 new->md_minor = MINOR(unit) >> MdpMinorShift;
269
df5b89b3 270 mutex_init(&new->reconfig_mutex);
1da177e4
LT		 271 INIT_LIST_HEAD(&new->disks);
272 INIT_LIST_HEAD(&new->all_mddevs);
273 init_timer(&new->safemode_timer);
274 atomic_set(&new->active, 1);
06d91a5f 275 spin_lock_init(&new->write_lock);
3d310eb7 276 init_waitqueue_head(&new->sb_wait);
1da177e4
LT		 277
278 new->queue = blk_alloc_queue(GFP_KERNEL);
279 if (!new->queue) {
280 kfree(new);
281 return NULL;
282 }
89e5c8b5 283 set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags);
1da177e4
LT		 284
285 blk_queue_make_request(new->queue, md_fail_request);
286
287 goto retry;
288}
289
290static inline int mddev_lock(mddev_t * mddev)
291{
df5b89b3 292 return mutex_lock_interruptible(&mddev->reconfig_mutex);
1da177e4
LT		 293}
294
1da177e4
LT		 295static inline int mddev_trylock(mddev_t * mddev)
296{
df5b89b3 297 return mutex_trylock(&mddev->reconfig_mutex);
1da177e4
LT		 298}
299
300static inline void mddev_unlock(mddev_t * mddev)
301{
df5b89b3 302 mutex_unlock(&mddev->reconfig_mutex);
1da177e4 303
005eca5e 304 md_wakeup_thread(mddev->thread);
1da177e4
LT		 305}
306
2989ddbd 307static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
1da177e4
LT		 308{
309 mdk_rdev_t * rdev;
310 struct list_head *tmp;
311
312 ITERATE_RDEV(mddev,rdev,tmp) {
313 if (rdev->desc_nr == nr)
314 return rdev;
315 }
316 return NULL;
317}
318
319static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
320{
321 struct list_head *tmp;
322 mdk_rdev_t *rdev;
323
324 ITERATE_RDEV(mddev,rdev,tmp) {
325 if (rdev->bdev->bd_dev == dev)
326 return rdev;
327 }
328 return NULL;
329}
330
d9d166c2 331static struct mdk_personality *find_pers(int level, char *clevel)
2604b703
N		 332{
333 struct mdk_personality *pers;
d9d166c2
N		 334 list_for_each_entry(pers, &pers_list, list) {
335 if (level != LEVEL_NONE && pers->level == level)
2604b703 336 return pers;
d9d166c2
N		 337 if (strcmp(pers->name, clevel)==0)
338 return pers;
339 }
2604b703
N		 340 return NULL;
341}
342
77933d72 343static inline sector_t calc_dev_sboffset(struct block_device *bdev)
1da177e4
LT		 344{
345 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
346 return MD_NEW_SIZE_BLOCKS(size);
347}
348
349static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
350{
351 sector_t size;
352
353 size = rdev->sb_offset;
354
355 if (chunk_size)
356 size &= ~((sector_t)chunk_size/1024 - 1);
357 return size;
358}
359
360static int alloc_disk_sb(mdk_rdev_t * rdev)
361{
362 if (rdev->sb_page)
363 MD_BUG();
364
365 rdev->sb_page = alloc_page(GFP_KERNEL);
366 if (!rdev->sb_page) {
367 printk(KERN_ALERT "md: out of memory.\n");
368 return -EINVAL;
369 }
370
371 return 0;
372}
373
374static void free_disk_sb(mdk_rdev_t * rdev)
375{
376 if (rdev->sb_page) {
2d1f3b5d 377 put_page(rdev->sb_page);
1da177e4
LT		 378 rdev->sb_loaded = 0;
379 rdev->sb_page = NULL;
380 rdev->sb_offset = 0;
381 rdev->size = 0;
382 }
383}
384
385
7bfa19f2
N		 386static int super_written(struct bio *bio, unsigned int bytes_done, int error)
387{
388 mdk_rdev_t *rdev = bio->bi_private;
a9701a30 389 mddev_t *mddev = rdev->mddev;
7bfa19f2
N		 390 if (bio->bi_size)
391 return 1;
392
393 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags))
a9701a30 394 md_error(mddev, rdev);
7bfa19f2 395
a9701a30
N		 396 if (atomic_dec_and_test(&mddev->pending_writes))
397 wake_up(&mddev->sb_wait);
f8b58edf 398 bio_put(bio);
7bfa19f2
N		 399 return 0;
400}
401
a9701a30
N		 402static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
403{
404 struct bio *bio2 = bio->bi_private;
405 mdk_rdev_t *rdev = bio2->bi_private;
406 mddev_t *mddev = rdev->mddev;
407 if (bio->bi_size)
408 return 1;
409
410 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
411 error == -EOPNOTSUPP) {
412 unsigned long flags;
413 /* barriers don't appear to be supported :-( */
414 set_bit(BarriersNotsupp, &rdev->flags);
415 mddev->barriers_work = 0;
416 spin_lock_irqsave(&mddev->write_lock, flags);
417 bio2->bi_next = mddev->biolist;
418 mddev->biolist = bio2;
419 spin_unlock_irqrestore(&mddev->write_lock, flags);
420 wake_up(&mddev->sb_wait);
421 bio_put(bio);
422 return 0;
423 }
424 bio_put(bio2);
425 bio->bi_private = rdev;
426 return super_written(bio, bytes_done, error);
427}
428
7bfa19f2
N		 429void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
430 sector_t sector, int size, struct page *page)
431{
432 /* write first size bytes of page to sector of rdev
433 * Increment mddev->pending_writes before returning
434 * and decrement it on completion, waking up sb_wait
435 * if zero is reached.
436 * If an error occurred, call md_error
a9701a30
N		 437 *
438 * As we might need to resubmit the request if BIO_RW_BARRIER
439 * causes ENOTSUPP, we allocate a spare bio...
7bfa19f2
N		 440 */
441 struct bio *bio = bio_alloc(GFP_NOIO, 1);
a9701a30 442 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
7bfa19f2
N		 443
444 bio->bi_bdev = rdev->bdev;
445 bio->bi_sector = sector;
446 bio_add_page(bio, page, size, 0);
447 bio->bi_private = rdev;
448 bio->bi_end_io = super_written;
a9701a30
N		 449 bio->bi_rw = rw;
450
7bfa19f2 451 atomic_inc(&mddev->pending_writes);
a9701a30
N		 452 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
453 struct bio *rbio;
454 rw |= (1<<BIO_RW_BARRIER);
455 rbio = bio_clone(bio, GFP_NOIO);
456 rbio->bi_private = bio;
457 rbio->bi_end_io = super_written_barrier;
458 submit_bio(rw, rbio);
459 } else
460 submit_bio(rw, bio);
461}
462
463void md_super_wait(mddev_t *mddev)
464{
465 /* wait for all superblock writes that were scheduled to complete.
466 * if any had to be retried (due to BARRIER problems), retry them
467 */
468 DEFINE_WAIT(wq);
469 for(;;) {
470 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
471 if (atomic_read(&mddev->pending_writes)==0)
472 break;
473 while (mddev->biolist) {
474 struct bio *bio;
475 spin_lock_irq(&mddev->write_lock);
476 bio = mddev->biolist;
477 mddev->biolist = bio->bi_next ;
478 bio->bi_next = NULL;
479 spin_unlock_irq(&mddev->write_lock);
480 submit_bio(bio->bi_rw, bio);
481 }
482 schedule();
483 }
484 finish_wait(&mddev->sb_wait, &wq);
7bfa19f2
N		 485}
486
1da177e4
LT		 487static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
488{
489 if (bio->bi_size)
490 return 1;
491
492 complete((struct completion*)bio->bi_private);
493 return 0;
494}
495
a654b9d8 496int sync_page_io(struct block_device *bdev, sector_t sector, int size,
1da177e4
LT		 497 struct page *page, int rw)
498{
baaa2c51 499 struct bio *bio = bio_alloc(GFP_NOIO, 1);
1da177e4
LT		 500 struct completion event;
501 int ret;
502
503 rw |= (1 << BIO_RW_SYNC);
504
505 bio->bi_bdev = bdev;
506 bio->bi_sector = sector;
507 bio_add_page(bio, page, size, 0);
508 init_completion(&event);
509 bio->bi_private = &event;
510 bio->bi_end_io = bi_complete;
511 submit_bio(rw, bio);
512 wait_for_completion(&event);
513
514 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
515 bio_put(bio);
516 return ret;
517}
a8745db2 518EXPORT_SYMBOL_GPL(sync_page_io);
1da177e4 519
0002b271 520static int read_disk_sb(mdk_rdev_t * rdev, int size)
1da177e4
LT		 521{
522 char b[BDEVNAME_SIZE];
523 if (!rdev->sb_page) {
524 MD_BUG();
525 return -EINVAL;
526 }
527 if (rdev->sb_loaded)
528 return 0;
529
530
0002b271 531 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
1da177e4
LT		 532 goto fail;
533 rdev->sb_loaded = 1;
534 return 0;
535
536fail:
537 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
538 bdevname(rdev->bdev,b));
539 return -EINVAL;
540}
541
542static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
543{
544 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
545 (sb1->set_uuid1 == sb2->set_uuid1) &&
546 (sb1->set_uuid2 == sb2->set_uuid2) &&
547 (sb1->set_uuid3 == sb2->set_uuid3))
548
549 return 1;
550
551 return 0;
552}
553
554
555static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
556{
557 int ret;
558 mdp_super_t *tmp1, *tmp2;
559
560 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
561 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
562
563 if (!tmp1 || !tmp2) {
564 ret = 0;
565 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
566 goto abort;
567 }
568
569 *tmp1 = *sb1;
570 *tmp2 = *sb2;
571
572 /*
573 * nr_disks is not constant
574 */
575 tmp1->nr_disks = 0;
576 tmp2->nr_disks = 0;
577
578 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
579 ret = 0;
580 else
581 ret = 1;
582
583abort:
990a8baf
JJ		 584 kfree(tmp1);
585 kfree(tmp2);
1da177e4
LT		 586 return ret;
587}
588
589static unsigned int calc_sb_csum(mdp_super_t * sb)
590{
591 unsigned int disk_csum, csum;
592
593 disk_csum = sb->sb_csum;
594 sb->sb_csum = 0;
595 csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
596 sb->sb_csum = disk_csum;
597 return csum;
598}
599
600
601/*
602 * Handle superblock details.
603 * We want to be able to handle multiple superblock formats
604 * so we have a common interface to them all, and an array of
605 * different handlers.
606 * We rely on user-space to write the initial superblock, and support
607 * reading and updating of superblocks.
608 * Interface methods are:
609 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
610 * loads and validates a superblock on dev.
611 * if refdev != NULL, compare superblocks on both devices
612 * Return:
613 * 0 - dev has a superblock that is compatible with refdev
614 * 1 - dev has a superblock that is compatible and newer than refdev
615 * so dev should be used as the refdev in future
616 * -EINVAL superblock incompatible or invalid
617 * -othererror e.g. -EIO
618 *
619 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
620 * Verify that dev is acceptable into mddev.
621 * The first time, mddev->raid_disks will be 0, and data from
622 * dev should be merged in. Subsequent calls check that dev
623 * is new enough. Return 0 or -EINVAL
624 *
625 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
626 * Update the superblock for rdev with data in mddev
627 * This does not write to disc.
628 *
629 */
630
631struct super_type {
632 char *name;
633 struct module *owner;
634 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
635 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
636 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
637};
638
639/*
640 * load_super for 0.90.0
641 */
642static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
643{
644 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
645 mdp_super_t *sb;
646 int ret;
647 sector_t sb_offset;
648
649 /*
650 * Calculate the position of the superblock,
651 * it's at the end of the disk.
652 *
653 * It also happens to be a multiple of 4Kb.
654 */
655 sb_offset = calc_dev_sboffset(rdev->bdev);
656 rdev->sb_offset = sb_offset;
657
0002b271 658 ret = read_disk_sb(rdev, MD_SB_BYTES);
1da177e4
LT		 659 if (ret) return ret;
660
661 ret = -EINVAL;
662
663 bdevname(rdev->bdev, b);
664 sb = (mdp_super_t*)page_address(rdev->sb_page);
665
666 if (sb->md_magic != MD_SB_MAGIC) {
667 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
668 b);
669 goto abort;
670 }
671
672 if (sb->major_version != 0 ||
f6705578
N		 673 sb->minor_version < 90 ||
674 sb->minor_version > 91) {
1da177e4
LT		 675 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
676 sb->major_version, sb->minor_version,
677 b);
678 goto abort;
679 }
680
681 if (sb->raid_disks <= 0)
682 goto abort;
683
684 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
685 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
686 b);
687 goto abort;
688 }
689
690 rdev->preferred_minor = sb->md_minor;
691 rdev->data_offset = 0;
0002b271 692 rdev->sb_size = MD_SB_BYTES;
1da177e4
LT		 693
694 if (sb->level == LEVEL_MULTIPATH)
695 rdev->desc_nr = -1;
696 else
697 rdev->desc_nr = sb->this_disk.number;
698
699 if (refdev == 0)
700 ret = 1;
701 else {
702 __u64 ev1, ev2;
703 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
704 if (!uuid_equal(refsb, sb)) {
705 printk(KERN_WARNING "md: %s has different UUID to %s\n",
706 b, bdevname(refdev->bdev,b2));
707 goto abort;
708 }
709 if (!sb_equal(refsb, sb)) {
710 printk(KERN_WARNING "md: %s has same UUID"
711 " but different superblock to %s\n",
712 b, bdevname(refdev->bdev, b2));
713 goto abort;
714 }
715 ev1 = md_event(sb);
716 ev2 = md_event(refsb);
717 if (ev1 > ev2)
718 ret = 1;
719 else
720 ret = 0;
721 }
722 rdev->size = calc_dev_size(rdev, sb->chunk_size);
723
2bf071bf
N		 724 if (rdev->size < sb->size && sb->level > 1)
725 /* "this cannot possibly happen" ... */
726 ret = -EINVAL;
727
1da177e4
LT		 728 abort:
729 return ret;
730}
731
732/*
733 * validate_super for 0.90.0
734 */
735static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
736{
737 mdp_disk_t *desc;
738 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
07d84d10 739 __u64 ev1 = md_event(sb);
1da177e4 740
41158c7e 741 rdev->raid_disk = -1;
b2d444d7 742 rdev->flags = 0;
1da177e4
LT		 743 if (mddev->raid_disks == 0) {
744 mddev->major_version = 0;
745 mddev->minor_version = sb->minor_version;
746 mddev->patch_version = sb->patch_version;
747 mddev->persistent = ! sb->not_persistent;
748 mddev->chunk_size = sb->chunk_size;
749 mddev->ctime = sb->ctime;
750 mddev->utime = sb->utime;
751 mddev->level = sb->level;
d9d166c2 752 mddev->clevel[0] = 0;
1da177e4
LT		 753 mddev->layout = sb->layout;
754 mddev->raid_disks = sb->raid_disks;
755 mddev->size = sb->size;
07d84d10 756 mddev->events = ev1;
9223214e 757 mddev->bitmap_offset = 0;
36fa3063 758 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
1da177e4 759
f6705578
N		 760 if (mddev->minor_version >= 91) {
761 mddev->reshape_position = sb->reshape_position;
762 mddev->delta_disks = sb->delta_disks;
763 mddev->new_level = sb->new_level;
764 mddev->new_layout = sb->new_layout;
765 mddev->new_chunk = sb->new_chunk;
766 } else {
767 mddev->reshape_position = MaxSector;
768 mddev->delta_disks = 0;
769 mddev->new_level = mddev->level;
770 mddev->new_layout = mddev->layout;
771 mddev->new_chunk = mddev->chunk_size;
772 }
773
1da177e4
LT		 774 if (sb->state & (1<<MD_SB_CLEAN))
775 mddev->recovery_cp = MaxSector;
776 else {
777 if (sb->events_hi == sb->cp_events_hi &&
778 sb->events_lo == sb->cp_events_lo) {
779 mddev->recovery_cp = sb->recovery_cp;
780 } else
781 mddev->recovery_cp = 0;
782 }
783
784 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
785 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
786 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
787 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
788
789 mddev->max_disks = MD_SB_DISKS;
a654b9d8
N		 790
791 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
792 mddev->bitmap_file == NULL) {
c5a10f62
N		 793 if (mddev->level != 1 && mddev->level != 4
794 && mddev->level != 5 && mddev->level != 6
6cce3b23 795 && mddev->level != 10) {
a654b9d8 796 /* FIXME use a better test */
6cce3b23 797 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
a654b9d8
N		 798 return -EINVAL;
799 }
36fa3063 800 mddev->bitmap_offset = mddev->default_bitmap_offset;
a654b9d8
N		 801 }
802
41158c7e
N		 803 } else if (mddev->pers == NULL) {
804 /* Insist on good event counter while assembling */
1da177e4
LT		 805 ++ev1;
806 if (ev1 < mddev->events)
807 return -EINVAL;
41158c7e
N		 808 } else if (mddev->bitmap) {
809 /* if adding to array with a bitmap, then we can accept an
810 * older device ... but not too old.
811 */
41158c7e
N		 812 if (ev1 < mddev->bitmap->events_cleared)
813 return 0;
07d84d10
N		 814 } else {
815 if (ev1 < mddev->events)
816 /* just a hot-add of a new device, leave raid_disk at -1 */
817 return 0;
818 }
41158c7e 819
1da177e4 820 if (mddev->level != LEVEL_MULTIPATH) {
1da177e4
LT		 821 desc = sb->disks + rdev->desc_nr;
822
823 if (desc->state & (1<<MD_DISK_FAULTY))
b2d444d7 824 set_bit(Faulty, &rdev->flags);
7c7546cc
N		 825 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
826 desc->raid_disk < mddev->raid_disks */) {
b2d444d7 827 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 828 rdev->raid_disk = desc->raid_disk;
829 }
8ddf9efe
N		 830 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
831 set_bit(WriteMostly, &rdev->flags);
41158c7e 832 } else /* MULTIPATH are always insync */
b2d444d7 833 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 834 return 0;
835}
836
837/*
838 * sync_super for 0.90.0
839 */
840static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
841{
842 mdp_super_t *sb;
843 struct list_head *tmp;
844 mdk_rdev_t *rdev2;
845 int next_spare = mddev->raid_disks;
19133a42 846
1da177e4
LT		 847
848 /* make rdev->sb match mddev data..
849 *
850 * 1/ zero out disks
851 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
852 * 3/ any empty disks < next_spare become removed
853 *
854 * disks[0] gets initialised to REMOVED because
855 * we cannot be sure from other fields if it has
856 * been initialised or not.
857 */
858 int i;
859 int active=0, working=0,failed=0,spare=0,nr_disks=0;
860
61181565
N		 861 rdev->sb_size = MD_SB_BYTES;
862
1da177e4
LT		 863 sb = (mdp_super_t*)page_address(rdev->sb_page);
864
865 memset(sb, 0, sizeof(*sb));
866
867 sb->md_magic = MD_SB_MAGIC;
868 sb->major_version = mddev->major_version;
1da177e4
LT		 869 sb->patch_version = mddev->patch_version;
870 sb->gvalid_words = 0; /* ignored */
871 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
872 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
873 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
874 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
875
876 sb->ctime = mddev->ctime;
877 sb->level = mddev->level;
878 sb->size = mddev->size;
879 sb->raid_disks = mddev->raid_disks;
880 sb->md_minor = mddev->md_minor;
881 sb->not_persistent = !mddev->persistent;
882 sb->utime = mddev->utime;
883 sb->state = 0;
884 sb->events_hi = (mddev->events>>32);
885 sb->events_lo = (u32)mddev->events;
886
f6705578
N		 887 if (mddev->reshape_position == MaxSector)
888 sb->minor_version = 90;
889 else {
890 sb->minor_version = 91;
891 sb->reshape_position = mddev->reshape_position;
892 sb->new_level = mddev->new_level;
893 sb->delta_disks = mddev->delta_disks;
894 sb->new_layout = mddev->new_layout;
895 sb->new_chunk = mddev->new_chunk;
896 }
897 mddev->minor_version = sb->minor_version;
1da177e4
LT		 898 if (mddev->in_sync)
899 {
900 sb->recovery_cp = mddev->recovery_cp;
901 sb->cp_events_hi = (mddev->events>>32);
902 sb->cp_events_lo = (u32)mddev->events;
903 if (mddev->recovery_cp == MaxSector)
904 sb->state = (1<< MD_SB_CLEAN);
905 } else
906 sb->recovery_cp = 0;
907
908 sb->layout = mddev->layout;
909 sb->chunk_size = mddev->chunk_size;
910
a654b9d8
N		 911 if (mddev->bitmap && mddev->bitmap_file == NULL)
912 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
913
1da177e4
LT		 914 sb->disks[0].state = (1<<MD_DISK_REMOVED);
915 ITERATE_RDEV(mddev,rdev2,tmp) {
916 mdp_disk_t *d;
86e6ffdd 917 int desc_nr;
b2d444d7
N		 918 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
919 && !test_bit(Faulty, &rdev2->flags))
86e6ffdd 920 desc_nr = rdev2->raid_disk;
1da177e4 921 else
86e6ffdd 922 desc_nr = next_spare++;
19133a42 923 rdev2->desc_nr = desc_nr;
1da177e4
LT		 924 d = &sb->disks[rdev2->desc_nr];
925 nr_disks++;
926 d->number = rdev2->desc_nr;
927 d->major = MAJOR(rdev2->bdev->bd_dev);
928 d->minor = MINOR(rdev2->bdev->bd_dev);
b2d444d7
N		 929 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
930 && !test_bit(Faulty, &rdev2->flags))
1da177e4
LT		 931 d->raid_disk = rdev2->raid_disk;
932 else
933 d->raid_disk = rdev2->desc_nr; /* compatibility */
1be7892f 934 if (test_bit(Faulty, &rdev2->flags))
1da177e4 935 d->state = (1<<MD_DISK_FAULTY);
1be7892f 936 else if (test_bit(In_sync, &rdev2->flags)) {
1da177e4
LT		 937 d->state = (1<<MD_DISK_ACTIVE);
938 d->state |= (1<<MD_DISK_SYNC);
939 active++;
940 working++;
941 } else {
942 d->state = 0;
943 spare++;
944 working++;
945 }
8ddf9efe
N		 946 if (test_bit(WriteMostly, &rdev2->flags))
947 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4 948 }
1da177e4
LT		 949 /* now set the "removed" and "faulty" bits on any missing devices */
950 for (i=0 ; i < mddev->raid_disks ; i++) {
951 mdp_disk_t *d = &sb->disks[i];
952 if (d->state == 0 && d->number == 0) {
953 d->number = i;
954 d->raid_disk = i;
955 d->state = (1<<MD_DISK_REMOVED);
956 d->state |= (1<<MD_DISK_FAULTY);
957 failed++;
958 }
959 }
960 sb->nr_disks = nr_disks;
961 sb->active_disks = active;
962 sb->working_disks = working;
963 sb->failed_disks = failed;
964 sb->spare_disks = spare;
965
966 sb->this_disk = sb->disks[rdev->desc_nr];
967 sb->sb_csum = calc_sb_csum(sb);
968}
969
970/*
971 * version 1 superblock
972 */
973
974static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
975{
976 unsigned int disk_csum, csum;
977 unsigned long long newcsum;
978 int size = 256 + le32_to_cpu(sb->max_dev)*2;
979 unsigned int *isuper = (unsigned int*)sb;
980 int i;
981
982 disk_csum = sb->sb_csum;
983 sb->sb_csum = 0;
984 newcsum = 0;
985 for (i=0; size>=4; size -= 4 )
986 newcsum += le32_to_cpu(*isuper++);
987
988 if (size == 2)
989 newcsum += le16_to_cpu(*(unsigned short*) isuper);
990
991 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
992 sb->sb_csum = disk_csum;
993 return cpu_to_le32(csum);
994}
995
996static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
997{
998 struct mdp_superblock_1 *sb;
999 int ret;
1000 sector_t sb_offset;
1001 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 1002 int bmask;
1da177e4
LT		 1003
1004 /*
1005 * Calculate the position of the superblock.
1006 * It is always aligned to a 4K boundary and
1007 * depeding on minor_version, it can be:
1008 * 0: At least 8K, but less than 12K, from end of device
1009 * 1: At start of device
1010 * 2: 4K from start of device.
1011 */
1012 switch(minor_version) {
1013 case 0:
1014 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1015 sb_offset -= 8*2;
39730960 1016 sb_offset &= ~(sector_t)(4*2-1);
1da177e4
LT		 1017 /* convert from sectors to K */
1018 sb_offset /= 2;
1019 break;
1020 case 1:
1021 sb_offset = 0;
1022 break;
1023 case 2:
1024 sb_offset = 4;
1025 break;
1026 default:
1027 return -EINVAL;
1028 }
1029 rdev->sb_offset = sb_offset;
1030
0002b271
N		 1031 /* superblock is rarely larger than 1K, but it can be larger,
1032 * and it is safe to read 4k, so we do that
1033 */
1034 ret = read_disk_sb(rdev, 4096);
1da177e4
LT		 1035 if (ret) return ret;
1036
1037
1038 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1039
1040 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1041 sb->major_version != cpu_to_le32(1) ||
1042 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1043 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
71c0805c 1044 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT		 1045 return -EINVAL;
1046
1047 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1048 printk("md: invalid superblock checksum on %s\n",
1049 bdevname(rdev->bdev,b));
1050 return -EINVAL;
1051 }
1052 if (le64_to_cpu(sb->data_size) < 10) {
1053 printk("md: data_size too small on %s\n",
1054 bdevname(rdev->bdev,b));
1055 return -EINVAL;
1056 }
1057 rdev->preferred_minor = 0xffff;
1058 rdev->data_offset = le64_to_cpu(sb->data_offset);
4dbcdc75 1059 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1da177e4 1060
0002b271 1061 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
720a3dc3 1062 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
0002b271
N		 1063 if (rdev->sb_size & bmask)
1064 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1065
1da177e4 1066 if (refdev == 0)
8ed75463 1067 ret = 1;
1da177e4
LT		 1068 else {
1069 __u64 ev1, ev2;
1070 struct mdp_superblock_1 *refsb =
1071 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1072
1073 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1074 sb->level != refsb->level ||
1075 sb->layout != refsb->layout ||
1076 sb->chunksize != refsb->chunksize) {
1077 printk(KERN_WARNING "md: %s has strangely different"
1078 " superblock to %s\n",
1079 bdevname(rdev->bdev,b),
1080 bdevname(refdev->bdev,b2));
1081 return -EINVAL;
1082 }
1083 ev1 = le64_to_cpu(sb->events);
1084 ev2 = le64_to_cpu(refsb->events);
1085
1086 if (ev1 > ev2)
8ed75463
N		 1087 ret = 1;
1088 else
1089 ret = 0;
1da177e4
LT		 1090 }
1091 if (minor_version)
1092 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1093 else
1094 rdev->size = rdev->sb_offset;
1095 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1096 return -EINVAL;
1097 rdev->size = le64_to_cpu(sb->data_size)/2;
1098 if (le32_to_cpu(sb->chunksize))
1099 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
2bf071bf
N		 1100
1101 if (le32_to_cpu(sb->size) > rdev->size*2)
1102 return -EINVAL;
8ed75463 1103 return ret;
1da177e4
LT		 1104}
1105
1106static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1107{
1108 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
07d84d10 1109 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4 1110
41158c7e 1111 rdev->raid_disk = -1;
b2d444d7 1112 rdev->flags = 0;
1da177e4
LT		 1113 if (mddev->raid_disks == 0) {
1114 mddev->major_version = 1;
1115 mddev->patch_version = 0;
1116 mddev->persistent = 1;
1117 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1118 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1119 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1120 mddev->level = le32_to_cpu(sb->level);
d9d166c2 1121 mddev->clevel[0] = 0;
1da177e4
LT		 1122 mddev->layout = le32_to_cpu(sb->layout);
1123 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1124 mddev->size = le64_to_cpu(sb->size)/2;
07d84d10 1125 mddev->events = ev1;
9223214e 1126 mddev->bitmap_offset = 0;
29fc7e3e 1127 mddev->default_bitmap_offset = 1024 >> 9;
1da177e4
LT		 1128
1129 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1130 memcpy(mddev->uuid, sb->set_uuid, 16);
1131
1132 mddev->max_disks = (4096-256)/2;
a654b9d8 1133
71c0805c 1134 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
a654b9d8 1135 mddev->bitmap_file == NULL ) {
6cce3b23
N		 1136 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
1137 && mddev->level != 10) {
1138 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
a654b9d8
N		 1139 return -EINVAL;
1140 }
1141 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1142 }
f6705578
N		 1143 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1144 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1145 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1146 mddev->new_level = le32_to_cpu(sb->new_level);
1147 mddev->new_layout = le32_to_cpu(sb->new_layout);
1148 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1149 } else {
1150 mddev->reshape_position = MaxSector;
1151 mddev->delta_disks = 0;
1152 mddev->new_level = mddev->level;
1153 mddev->new_layout = mddev->layout;
1154 mddev->new_chunk = mddev->chunk_size;
1155 }
1156
41158c7e
N		 1157 } else if (mddev->pers == NULL) {
1158 /* Insist of good event counter while assembling */
1da177e4
LT		 1159 ++ev1;
1160 if (ev1 < mddev->events)
1161 return -EINVAL;
41158c7e
N		 1162 } else if (mddev->bitmap) {
1163 /* If adding to array with a bitmap, then we can accept an
1164 * older device, but not too old.
1165 */
41158c7e
N		 1166 if (ev1 < mddev->bitmap->events_cleared)
1167 return 0;
07d84d10
N		 1168 } else {
1169 if (ev1 < mddev->events)
1170 /* just a hot-add of a new device, leave raid_disk at -1 */
1171 return 0;
1172 }
1da177e4
LT		 1173 if (mddev->level != LEVEL_MULTIPATH) {
1174 int role;
1175 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1176 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1177 switch(role) {
1178 case 0xffff: /* spare */
1da177e4
LT		 1179 break;
1180 case 0xfffe: /* faulty */
b2d444d7 1181 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 1182 break;
1183 default:
5fd6c1dc
N		 1184 if ((le32_to_cpu(sb->feature_map) &
1185 MD_FEATURE_RECOVERY_OFFSET))
1186 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1187 else
1188 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1189 rdev->raid_disk = role;
1190 break;
1191 }
8ddf9efe
N		 1192 if (sb->devflags & WriteMostly1)
1193 set_bit(WriteMostly, &rdev->flags);
41158c7e 1194 } else /* MULTIPATH are always insync */
b2d444d7 1195 set_bit(In_sync, &rdev->flags);
41158c7e 1196
1da177e4
LT		 1197 return 0;
1198}
1199
1200static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1201{
1202 struct mdp_superblock_1 *sb;
1203 struct list_head *tmp;
1204 mdk_rdev_t *rdev2;
1205 int max_dev, i;
1206 /* make rdev->sb match mddev and rdev data. */
1207
1208 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1209
1210 sb->feature_map = 0;
1211 sb->pad0 = 0;
5fd6c1dc 1212 sb->recovery_offset = cpu_to_le64(0);
1da177e4
LT		 1213 memset(sb->pad1, 0, sizeof(sb->pad1));
1214 memset(sb->pad2, 0, sizeof(sb->pad2));
1215 memset(sb->pad3, 0, sizeof(sb->pad3));
1216
1217 sb->utime = cpu_to_le64((__u64)mddev->utime);
1218 sb->events = cpu_to_le64(mddev->events);
1219 if (mddev->in_sync)
1220 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1221 else
1222 sb->resync_offset = cpu_to_le64(0);
1223
4dbcdc75
N		 1224 sb->cnt_corrected_read = atomic_read(&rdev->corrected_errors);
1225
f0ca340c 1226 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
29fc7e3e 1227 sb->size = cpu_to_le64(mddev->size<<1);
f0ca340c 1228
a654b9d8
N		 1229 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1230 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
71c0805c 1231 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8 1232 }
5fd6c1dc
N		 1233
1234 if (rdev->raid_disk >= 0 &&
1235 !test_bit(In_sync, &rdev->flags) &&
1236 rdev->recovery_offset > 0) {
1237 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1238 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1239 }
1240
f6705578
N		 1241 if (mddev->reshape_position != MaxSector) {
1242 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1243 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1244 sb->new_layout = cpu_to_le32(mddev->new_layout);
1245 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1246 sb->new_level = cpu_to_le32(mddev->new_level);
1247 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1248 }
a654b9d8 1249
1da177e4
LT		 1250 max_dev = 0;
1251 ITERATE_RDEV(mddev,rdev2,tmp)
1252 if (rdev2->desc_nr+1 > max_dev)
1253 max_dev = rdev2->desc_nr+1;
1254
1255 sb->max_dev = cpu_to_le32(max_dev);
1256 for (i=0; i<max_dev;i++)
1257 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1258
1259 ITERATE_RDEV(mddev,rdev2,tmp) {
1260 i = rdev2->desc_nr;
b2d444d7 1261 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1262 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1263 else if (test_bit(In_sync, &rdev2->flags))
1da177e4 1264 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
5fd6c1dc
N		 1265 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1266 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1da177e4
LT		 1267 else
1268 sb->dev_roles[i] = cpu_to_le16(0xffff);
1269 }
1270
1da177e4
LT		 1271 sb->sb_csum = calc_sb_1_csum(sb);
1272}
1273
1274
75c96f85 1275static struct super_type super_types[] = {
1da177e4
LT		 1276 [0] = {
1277 .name = "0.90.0",
1278 .owner = THIS_MODULE,
1279 .load_super = super_90_load,
1280 .validate_super = super_90_validate,
1281 .sync_super = super_90_sync,
1282 },
1283 [1] = {
1284 .name = "md-1",
1285 .owner = THIS_MODULE,
1286 .load_super = super_1_load,
1287 .validate_super = super_1_validate,
1288 .sync_super = super_1_sync,
1289 },
1290};
1291
1292static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1293{
1294 struct list_head *tmp;
1295 mdk_rdev_t *rdev;
1296
1297 ITERATE_RDEV(mddev,rdev,tmp)
1298 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1299 return rdev;
1300
1301 return NULL;
1302}
1303
1304static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1305{
1306 struct list_head *tmp;
1307 mdk_rdev_t *rdev;
1308
1309 ITERATE_RDEV(mddev1,rdev,tmp)
1310 if (match_dev_unit(mddev2, rdev))
1311 return 1;
1312
1313 return 0;
1314}
1315
1316static LIST_HEAD(pending_raid_disks);
1317
1318static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1319{
1320 mdk_rdev_t *same_pdev;
1321 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
f637b9f9 1322 struct kobject *ko;
1edf80d3 1323 char *s;
1da177e4
LT		 1324
1325 if (rdev->mddev) {
1326 MD_BUG();
1327 return -EINVAL;
1328 }
2bf071bf
N		 1329 /* make sure rdev->size exceeds mddev->size */
1330 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1331 if (mddev->pers)
1332 /* Cannot change size, so fail */
1333 return -ENOSPC;
1334 else
1335 mddev->size = rdev->size;
1336 }
1da177e4
LT		 1337 same_pdev = match_dev_unit(mddev, rdev);
1338 if (same_pdev)
1339 printk(KERN_WARNING
1340 "%s: WARNING: %s appears to be on the same physical"
1341 " disk as %s. True\n protection against single-disk"
1342 " failure might be compromised.\n",
1343 mdname(mddev), bdevname(rdev->bdev,b),
1344 bdevname(same_pdev->bdev,b2));
1345
1346 /* Verify rdev->desc_nr is unique.
1347 * If it is -1, assign a free number, else
1348 * check number is not in use
1349 */
1350 if (rdev->desc_nr < 0) {
1351 int choice = 0;
1352 if (mddev->pers) choice = mddev->raid_disks;
1353 while (find_rdev_nr(mddev, choice))
1354 choice++;
1355 rdev->desc_nr = choice;
1356 } else {
1357 if (find_rdev_nr(mddev, rdev->desc_nr))
1358 return -EBUSY;
1359 }
19133a42
N		 1360 bdevname(rdev->bdev,b);
1361 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1362 return -ENOMEM;
1edf80d3
NB		 1363 while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
1364 *s = '!';
1da177e4
LT		 1365
1366 list_add(&rdev->same_set, &mddev->disks);
1367 rdev->mddev = mddev;
19133a42 1368 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 1369
9c791977 1370 rdev->kobj.parent = &mddev->kobj;
86e6ffdd
N		 1371 kobject_add(&rdev->kobj);
1372
f637b9f9
N		 1373 if (rdev->bdev->bd_part)
1374 ko = &rdev->bdev->bd_part->kobj;
1375 else
1376 ko = &rdev->bdev->bd_disk->kobj;
1377 sysfs_create_link(&rdev->kobj, ko, "block");
5463c790 1378 bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
1da177e4
LT		 1379 return 0;
1380}
1381
1382static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1383{
1384 char b[BDEVNAME_SIZE];
1385 if (!rdev->mddev) {
1386 MD_BUG();
1387 return;
1388 }
5463c790 1389 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1da177e4
LT		 1390 list_del_init(&rdev->same_set);
1391 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1392 rdev->mddev = NULL;
86e6ffdd
N		 1393 sysfs_remove_link(&rdev->kobj, "block");
1394 kobject_del(&rdev->kobj);
1da177e4
LT		 1395}
1396
1397/*
1398 * prevent the device from being mounted, repartitioned or
1399 * otherwise reused by a RAID array (or any other kernel
1400 * subsystem), by bd_claiming the device.
1401 */
1402static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1403{
1404 int err = 0;
1405 struct block_device *bdev;
1406 char b[BDEVNAME_SIZE];
1407
1408 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1409 if (IS_ERR(bdev)) {
1410 printk(KERN_ERR "md: could not open %s.\n",
1411 __bdevname(dev, b));
1412 return PTR_ERR(bdev);
1413 }
1414 err = bd_claim(bdev, rdev);
1415 if (err) {
1416 printk(KERN_ERR "md: could not bd_claim %s.\n",
1417 bdevname(bdev, b));
1418 blkdev_put(bdev);
1419 return err;
1420 }
1421 rdev->bdev = bdev;
1422 return err;
1423}
1424
1425static void unlock_rdev(mdk_rdev_t *rdev)
1426{
1427 struct block_device *bdev = rdev->bdev;
1428 rdev->bdev = NULL;
1429 if (!bdev)
1430 MD_BUG();
1431 bd_release(bdev);
1432 blkdev_put(bdev);
1433}
1434
1435void md_autodetect_dev(dev_t dev);
1436
1437static void export_rdev(mdk_rdev_t * rdev)
1438{
1439 char b[BDEVNAME_SIZE];
1440 printk(KERN_INFO "md: export_rdev(%s)\n",
1441 bdevname(rdev->bdev,b));
1442 if (rdev->mddev)
1443 MD_BUG();
1444 free_disk_sb(rdev);
1445 list_del_init(&rdev->same_set);
1446#ifndef MODULE
1447 md_autodetect_dev(rdev->bdev->bd_dev);
1448#endif
1449 unlock_rdev(rdev);
86e6ffdd 1450 kobject_put(&rdev->kobj);
1da177e4
LT		 1451}
1452
1453static void kick_rdev_from_array(mdk_rdev_t * rdev)
1454{
1455 unbind_rdev_from_array(rdev);
1456 export_rdev(rdev);
1457}
1458
1459static void export_array(mddev_t *mddev)
1460{
1461 struct list_head *tmp;
1462 mdk_rdev_t *rdev;
1463
1464 ITERATE_RDEV(mddev,rdev,tmp) {
1465 if (!rdev->mddev) {
1466 MD_BUG();
1467 continue;
1468 }
1469 kick_rdev_from_array(rdev);
1470 }
1471 if (!list_empty(&mddev->disks))
1472 MD_BUG();
1473 mddev->raid_disks = 0;
1474 mddev->major_version = 0;
1475}
1476
1477static void print_desc(mdp_disk_t *desc)
1478{
1479 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1480 desc->major,desc->minor,desc->raid_disk,desc->state);
1481}
1482
1483static void print_sb(mdp_super_t *sb)
1484{
1485 int i;
1486
1487 printk(KERN_INFO
1488 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1489 sb->major_version, sb->minor_version, sb->patch_version,
1490 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1491 sb->ctime);
1492 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1493 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1494 sb->md_minor, sb->layout, sb->chunk_size);
1495 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1496 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1497 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1498 sb->failed_disks, sb->spare_disks,
1499 sb->sb_csum, (unsigned long)sb->events_lo);
1500
1501 printk(KERN_INFO);
1502 for (i = 0; i < MD_SB_DISKS; i++) {
1503 mdp_disk_t *desc;
1504
1505 desc = sb->disks + i;
1506 if (desc->number || desc->major || desc->minor ||
1507 desc->raid_disk || (desc->state && (desc->state != 4))) {
1508 printk(" D %2d: ", i);
1509 print_desc(desc);
1510 }
1511 }
1512 printk(KERN_INFO "md: THIS: ");
1513 print_desc(&sb->this_disk);
1514
1515}
1516
1517static void print_rdev(mdk_rdev_t *rdev)
1518{
1519 char b[BDEVNAME_SIZE];
1520 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1521 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
b2d444d7
N		 1522 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1523 rdev->desc_nr);
1da177e4
LT		 1524 if (rdev->sb_loaded) {
1525 printk(KERN_INFO "md: rdev superblock:\n");
1526 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1527 } else
1528 printk(KERN_INFO "md: no rdev superblock!\n");
1529}
1530
5e56341d 1531static void md_print_devices(void)
1da177e4
LT		 1532{
1533 struct list_head *tmp, *tmp2;
1534 mdk_rdev_t *rdev;
1535 mddev_t *mddev;
1536 char b[BDEVNAME_SIZE];
1537
1538 printk("\n");
1539 printk("md: **********************************\n");
1540 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1541 printk("md: **********************************\n");
1542 ITERATE_MDDEV(mddev,tmp) {
1da177e4 1543
32a7627c
N		 1544 if (mddev->bitmap)
1545 bitmap_print_sb(mddev->bitmap);
1546 else
1547 printk("%s: ", mdname(mddev));
1da177e4
LT		 1548 ITERATE_RDEV(mddev,rdev,tmp2)
1549 printk("<%s>", bdevname(rdev->bdev,b));
1550 printk("\n");
1551
1552 ITERATE_RDEV(mddev,rdev,tmp2)
1553 print_rdev(rdev);
1554 }
1555 printk("md: **********************************\n");
1556 printk("\n");
1557}
1558
1559
42543769 1560static void sync_sbs(mddev_t * mddev, int nospares)
1da177e4 1561{
42543769
N		 1562 /* Update each superblock (in-memory image), but
1563 * if we are allowed to, skip spares which already
1564 * have the right event counter, or have one earlier
1565 * (which would mean they aren't being marked as dirty
1566 * with the rest of the array)
1567 */
1da177e4
LT		 1568 mdk_rdev_t *rdev;
1569 struct list_head *tmp;
1570
1571 ITERATE_RDEV(mddev,rdev,tmp) {
42543769
N		 1572 if (rdev->sb_events == mddev->events ||
1573 (nospares &&
1574 rdev->raid_disk < 0 &&
1575 (rdev->sb_events&1)==0 &&
1576 rdev->sb_events+1 == mddev->events)) {
1577 /* Don't update this superblock */
1578 rdev->sb_loaded = 2;
1579 } else {
1580 super_types[mddev->major_version].
1581 sync_super(mddev, rdev);
1582 rdev->sb_loaded = 1;
1583 }
1da177e4
LT		 1584 }
1585}
1586
f6705578 1587void md_update_sb(mddev_t * mddev)
1da177e4 1588{
7bfa19f2 1589 int err;
1da177e4
LT		 1590 struct list_head *tmp;
1591 mdk_rdev_t *rdev;
06d91a5f 1592 int sync_req;
42543769 1593 int nospares = 0;
1da177e4 1594
1da177e4 1595repeat:
a9701a30 1596 spin_lock_irq(&mddev->write_lock);
06d91a5f 1597 sync_req = mddev->in_sync;
1da177e4 1598 mddev->utime = get_seconds();
42543769
N		 1599 if (mddev->sb_dirty == 3)
1600 /* just a clean<-> dirty transition, possibly leave spares alone,
1601 * though if events isn't the right even/odd, we will have to do
1602 * spares after all
1603 */
1604 nospares = 1;
1605
1606 /* If this is just a dirty<->clean transition, and the array is clean
1607 * and 'events' is odd, we can roll back to the previous clean state */
1608 if (mddev->sb_dirty == 3
1609 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1610 && (mddev->events & 1))
1611 mddev->events--;
1612 else {
1613 /* otherwise we have to go forward and ... */
1614 mddev->events ++;
1615 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1616 /* .. if the array isn't clean, insist on an odd 'events' */
1617 if ((mddev->events&1)==0) {
1618 mddev->events++;
1619 nospares = 0;
1620 }
1621 } else {
1622 /* otherwise insist on an even 'events' (for clean states) */
1623 if ((mddev->events&1)) {
1624 mddev->events++;
1625 nospares = 0;
1626 }
1627 }
1628 }
1da177e4
LT		 1629
1630 if (!mddev->events) {
1631 /*
1632 * oops, this 64-bit counter should never wrap.
1633 * Either we are in around ~1 trillion A.C., assuming
1634 * 1 reboot per second, or we have a bug:
1635 */
1636 MD_BUG();
1637 mddev->events --;
1638 }
7bfa19f2 1639 mddev->sb_dirty = 2;
42543769 1640 sync_sbs(mddev, nospares);
1da177e4
LT		 1641
1642 /*
1643 * do not write anything to disk if using
1644 * nonpersistent superblocks
1645 */
06d91a5f
N		 1646 if (!mddev->persistent) {
1647 mddev->sb_dirty = 0;
a9701a30 1648 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1649 wake_up(&mddev->sb_wait);
1da177e4 1650 return;
06d91a5f 1651 }
a9701a30 1652 spin_unlock_irq(&mddev->write_lock);
1da177e4
LT		 1653
1654 dprintk(KERN_INFO
1655 "md: updating %s RAID superblock on device (in sync %d)\n",
1656 mdname(mddev),mddev->in_sync);
1657
32a7627c 1658 err = bitmap_update_sb(mddev->bitmap);
1da177e4
LT		 1659 ITERATE_RDEV(mddev,rdev,tmp) {
1660 char b[BDEVNAME_SIZE];
1661 dprintk(KERN_INFO "md: ");
42543769
N		 1662 if (rdev->sb_loaded != 1)
1663 continue; /* no noise on spare devices */
b2d444d7 1664 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1665 dprintk("(skipping faulty ");
1666
1667 dprintk("%s ", bdevname(rdev->bdev,b));
b2d444d7 1668 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 1669 md_super_write(mddev,rdev,
0002b271 1670 rdev->sb_offset<<1, rdev->sb_size,
7bfa19f2
N		 1671 rdev->sb_page);
1672 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1673 bdevname(rdev->bdev,b),
1674 (unsigned long long)rdev->sb_offset);
42543769 1675 rdev->sb_events = mddev->events;
7bfa19f2 1676
1da177e4
LT		 1677 } else
1678 dprintk(")\n");
7bfa19f2 1679 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT		 1680 /* only need to write one superblock... */
1681 break;
1682 }
a9701a30 1683 md_super_wait(mddev);
7bfa19f2
N		 1684 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1685
a9701a30 1686 spin_lock_irq(&mddev->write_lock);
7bfa19f2 1687 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
06d91a5f 1688 /* have to write it out again */
a9701a30 1689 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N		 1690 goto repeat;
1691 }
1692 mddev->sb_dirty = 0;
a9701a30 1693 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1694 wake_up(&mddev->sb_wait);
06d91a5f 1695
1da177e4 1696}
f6705578 1697EXPORT_SYMBOL_GPL(md_update_sb);
1da177e4 1698
bce74dac
N		 1699/* words written to sysfs files may, or my not, be \n terminated.
1700 * We want to accept with case. For this we use cmd_match.
1701 */
1702static int cmd_match(const char *cmd, const char *str)
1703{
1704 /* See if cmd, written into a sysfs file, matches
1705 * str. They must either be the same, or cmd can
1706 * have a trailing newline
1707 */
1708 while (*cmd && *str && *cmd == *str) {
1709 cmd++;
1710 str++;
1711 }
1712 if (*cmd == '\n')
1713 cmd++;
1714 if (*str || *cmd)
1715 return 0;
1716 return 1;
1717}
1718
86e6ffdd
N		 1719struct rdev_sysfs_entry {
1720 struct attribute attr;
1721 ssize_t (*show)(mdk_rdev_t *, char *);
1722 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1723};
1724
1725static ssize_t
96de1e66 1726state_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1727{
1728 char *sep = "";
1729 int len=0;
1730
b2d444d7 1731 if (test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 1732 len+= sprintf(page+len, "%sfaulty",sep);
1733 sep = ",";
1734 }
b2d444d7 1735 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1736 len += sprintf(page+len, "%sin_sync",sep);
1737 sep = ",";
1738 }
f655675b
N		 1739 if (test_bit(WriteMostly, &rdev->flags)) {
1740 len += sprintf(page+len, "%swrite_mostly",sep);
1741 sep = ",";
1742 }
b2d444d7
N		 1743 if (!test_bit(Faulty, &rdev->flags) &&
1744 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1745 len += sprintf(page+len, "%sspare", sep);
1746 sep = ",";
1747 }
1748 return len+sprintf(page+len, "\n");
1749}
1750
45dc2de1
N		 1751static ssize_t
1752state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1753{
1754 /* can write
1755 * faulty - simulates and error
1756 * remove - disconnects the device
f655675b
N		 1757 * writemostly - sets write_mostly
1758 * -writemostly - clears write_mostly
45dc2de1
N		 1759 */
1760 int err = -EINVAL;
1761 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1762 md_error(rdev->mddev, rdev);
1763 err = 0;
1764 } else if (cmd_match(buf, "remove")) {
1765 if (rdev->raid_disk >= 0)
1766 err = -EBUSY;
1767 else {
1768 mddev_t *mddev = rdev->mddev;
1769 kick_rdev_from_array(rdev);
1770 md_update_sb(mddev);
1771 md_new_event(mddev);
1772 err = 0;
1773 }
f655675b
N		 1774 } else if (cmd_match(buf, "writemostly")) {
1775 set_bit(WriteMostly, &rdev->flags);
1776 err = 0;
1777 } else if (cmd_match(buf, "-writemostly")) {
1778 clear_bit(WriteMostly, &rdev->flags);
1779 err = 0;
45dc2de1
N		 1780 }
1781 return err ? err : len;
1782}
96de1e66 1783static struct rdev_sysfs_entry
45dc2de1 1784rdev_state = __ATTR(state, 0644, state_show, state_store);
86e6ffdd
N		 1785
1786static ssize_t
96de1e66 1787super_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1788{
1789 if (rdev->sb_loaded && rdev->sb_size) {
1790 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1791 return rdev->sb_size;
1792 } else
1793 return 0;
1794}
96de1e66
N		 1795static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1796
4dbcdc75
N		 1797static ssize_t
1798errors_show(mdk_rdev_t *rdev, char *page)
1799{
1800 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1801}
1802
1803static ssize_t
1804errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1805{
1806 char *e;
1807 unsigned long n = simple_strtoul(buf, &e, 10);
1808 if (*buf && (*e == 0 || *e == '\n')) {
1809 atomic_set(&rdev->corrected_errors, n);
1810 return len;
1811 }
1812 return -EINVAL;
1813}
1814static struct rdev_sysfs_entry rdev_errors =
1815__ATTR(errors, 0644, errors_show, errors_store);
1816
014236d2
N		 1817static ssize_t
1818slot_show(mdk_rdev_t *rdev, char *page)
1819{
1820 if (rdev->raid_disk < 0)
1821 return sprintf(page, "none\n");
1822 else
1823 return sprintf(page, "%d\n", rdev->raid_disk);
1824}
1825
1826static ssize_t
1827slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1828{
1829 char *e;
1830 int slot = simple_strtoul(buf, &e, 10);
1831 if (strncmp(buf, "none", 4)==0)
1832 slot = -1;
1833 else if (e==buf || (*e && *e!= '\n'))
1834 return -EINVAL;
1835 if (rdev->mddev->pers)
1836 /* Cannot set slot in active array (yet) */
1837 return -EBUSY;
1838 if (slot >= rdev->mddev->raid_disks)
1839 return -ENOSPC;
1840 rdev->raid_disk = slot;
1841 /* assume it is working */
1842 rdev->flags = 0;
1843 set_bit(In_sync, &rdev->flags);
1844 return len;
1845}
1846
1847
1848static struct rdev_sysfs_entry rdev_slot =
1849__ATTR(slot, 0644, slot_show, slot_store);
1850
93c8cad0
N		 1851static ssize_t
1852offset_show(mdk_rdev_t *rdev, char *page)
1853{
6961ece4 1854 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
93c8cad0
N		 1855}
1856
1857static ssize_t
1858offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1859{
1860 char *e;
1861 unsigned long long offset = simple_strtoull(buf, &e, 10);
1862 if (e==buf || (*e && *e != '\n'))
1863 return -EINVAL;
1864 if (rdev->mddev->pers)
1865 return -EBUSY;
1866 rdev->data_offset = offset;
1867 return len;
1868}
1869
1870static struct rdev_sysfs_entry rdev_offset =
1871__ATTR(offset, 0644, offset_show, offset_store);
1872
83303b61
N		 1873static ssize_t
1874rdev_size_show(mdk_rdev_t *rdev, char *page)
1875{
1876 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1877}
1878
1879static ssize_t
1880rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1881{
1882 char *e;
1883 unsigned long long size = simple_strtoull(buf, &e, 10);
1884 if (e==buf || (*e && *e != '\n'))
1885 return -EINVAL;
1886 if (rdev->mddev->pers)
1887 return -EBUSY;
1888 rdev->size = size;
1889 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1890 rdev->mddev->size = size;
1891 return len;
1892}
1893
1894static struct rdev_sysfs_entry rdev_size =
1895__ATTR(size, 0644, rdev_size_show, rdev_size_store);
1896
86e6ffdd
N		 1897static struct attribute *rdev_default_attrs[] = {
1898 &rdev_state.attr,
1899 &rdev_super.attr,
4dbcdc75 1900 &rdev_errors.attr,
014236d2 1901 &rdev_slot.attr,
93c8cad0 1902 &rdev_offset.attr,
83303b61 1903 &rdev_size.attr,
86e6ffdd
N		 1904 NULL,
1905};
1906static ssize_t
1907rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1908{
1909 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1910 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1911
1912 if (!entry->show)
1913 return -EIO;
1914 return entry->show(rdev, page);
1915}
1916
1917static ssize_t
1918rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1919 const char *page, size_t length)
1920{
1921 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1922 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1923
1924 if (!entry->store)
1925 return -EIO;
1926 return entry->store(rdev, page, length);
1927}
1928
1929static void rdev_free(struct kobject *ko)
1930{
1931 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1932 kfree(rdev);
1933}
1934static struct sysfs_ops rdev_sysfs_ops = {
1935 .show = rdev_attr_show,
1936 .store = rdev_attr_store,
1937};
1938static struct kobj_type rdev_ktype = {
1939 .release = rdev_free,
1940 .sysfs_ops = &rdev_sysfs_ops,
1941 .default_attrs = rdev_default_attrs,
1942};
1943
1da177e4
LT		 1944/*
1945 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1946 *
1947 * mark the device faulty if:
1948 *
1949 * - the device is nonexistent (zero size)
1950 * - the device has no valid superblock
1951 *
1952 * a faulty rdev _never_ has rdev->sb set.
1953 */
1954static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1955{
1956 char b[BDEVNAME_SIZE];
1957 int err;
1958 mdk_rdev_t *rdev;
1959 sector_t size;
1960
9ffae0cf 1961 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1da177e4
LT		 1962 if (!rdev) {
1963 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1964 return ERR_PTR(-ENOMEM);
1965 }
1da177e4
LT		 1966
1967 if ((err = alloc_disk_sb(rdev)))
1968 goto abort_free;
1969
1970 err = lock_rdev(rdev, newdev);
1971 if (err)
1972 goto abort_free;
1973
86e6ffdd
N		 1974 rdev->kobj.parent = NULL;
1975 rdev->kobj.ktype = &rdev_ktype;
1976 kobject_init(&rdev->kobj);
1977
1da177e4 1978 rdev->desc_nr = -1;
b2d444d7 1979 rdev->flags = 0;
1da177e4 1980 rdev->data_offset = 0;
42543769 1981 rdev->sb_events = 0;
1da177e4 1982 atomic_set(&rdev->nr_pending, 0);
ba22dcbf 1983 atomic_set(&rdev->read_errors, 0);
4dbcdc75 1984 atomic_set(&rdev->corrected_errors, 0);
1da177e4
LT		 1985
1986 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
1987 if (!size) {
1988 printk(KERN_WARNING
1989 "md: %s has zero or unknown size, marking faulty!\n",
1990 bdevname(rdev->bdev,b));
1991 err = -EINVAL;
1992 goto abort_free;
1993 }
1994
1995 if (super_format >= 0) {
1996 err = super_types[super_format].
1997 load_super(rdev, NULL, super_minor);
1998 if (err == -EINVAL) {
1999 printk(KERN_WARNING
2000 "md: %s has invalid sb, not importing!\n",
2001 bdevname(rdev->bdev,b));
2002 goto abort_free;
2003 }
2004 if (err < 0) {
2005 printk(KERN_WARNING
2006 "md: could not read %s's sb, not importing!\n",
2007 bdevname(rdev->bdev,b));
2008 goto abort_free;
2009 }
2010 }
2011 INIT_LIST_HEAD(&rdev->same_set);
2012
2013 return rdev;
2014
2015abort_free:
2016 if (rdev->sb_page) {
2017 if (rdev->bdev)
2018 unlock_rdev(rdev);
2019 free_disk_sb(rdev);
2020 }
2021 kfree(rdev);
2022 return ERR_PTR(err);
2023}
2024
2025/*
2026 * Check a full RAID array for plausibility
2027 */
2028
2029
a757e64c 2030static void analyze_sbs(mddev_t * mddev)
1da177e4
LT		 2031{
2032 int i;
2033 struct list_head *tmp;
2034 mdk_rdev_t *rdev, *freshest;
2035 char b[BDEVNAME_SIZE];
2036
2037 freshest = NULL;
2038 ITERATE_RDEV(mddev,rdev,tmp)
2039 switch (super_types[mddev->major_version].
2040 load_super(rdev, freshest, mddev->minor_version)) {
2041 case 1:
2042 freshest = rdev;
2043 break;
2044 case 0:
2045 break;
2046 default:
2047 printk( KERN_ERR \
2048 "md: fatal superblock inconsistency in %s"
2049 " -- removing from array\n",
2050 bdevname(rdev->bdev,b));
2051 kick_rdev_from_array(rdev);
2052 }
2053
2054
2055 super_types[mddev->major_version].
2056 validate_super(mddev, freshest);
2057
2058 i = 0;
2059 ITERATE_RDEV(mddev,rdev,tmp) {
2060 if (rdev != freshest)
2061 if (super_types[mddev->major_version].
2062 validate_super(mddev, rdev)) {
2063 printk(KERN_WARNING "md: kicking non-fresh %s"
2064 " from array!\n",
2065 bdevname(rdev->bdev,b));
2066 kick_rdev_from_array(rdev);
2067 continue;
2068 }
2069 if (mddev->level == LEVEL_MULTIPATH) {
2070 rdev->desc_nr = i++;
2071 rdev->raid_disk = rdev->desc_nr;
b2d444d7 2072 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 2073 }
2074 }
2075
2076
2077
2078 if (mddev->recovery_cp != MaxSector &&
2079 mddev->level >= 1)
2080 printk(KERN_ERR "md: %s: raid array is not clean"
2081 " -- starting background reconstruction\n",
2082 mdname(mddev));
2083
1da177e4
LT		 2084}
2085
16f17b39
N		 2086static ssize_t
2087safe_delay_show(mddev_t *mddev, char *page)
2088{
2089 int msec = (mddev->safemode_delay*1000)/HZ;
2090 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2091}
2092static ssize_t
2093safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2094{
2095 int scale=1;
2096 int dot=0;
2097 int i;
2098 unsigned long msec;
2099 char buf[30];
2100 char *e;
2101 /* remove a period, and count digits after it */
2102 if (len >= sizeof(buf))
2103 return -EINVAL;
2104 strlcpy(buf, cbuf, len);
2105 buf[len] = 0;
2106 for (i=0; i<len; i++) {
2107 if (dot) {
2108 if (isdigit(buf[i])) {
2109 buf[i-1] = buf[i];
2110 scale *= 10;
2111 }
2112 buf[i] = 0;
2113 } else if (buf[i] == '.') {
2114 dot=1;
2115 buf[i] = 0;
2116 }
2117 }
2118 msec = simple_strtoul(buf, &e, 10);
2119 if (e == buf || (*e && *e != '\n'))
2120 return -EINVAL;
2121 msec = (msec * 1000) / scale;
2122 if (msec == 0)
2123 mddev->safemode_delay = 0;
2124 else {
2125 mddev->safemode_delay = (msec*HZ)/1000;
2126 if (mddev->safemode_delay == 0)
2127 mddev->safemode_delay = 1;
2128 }
2129 return len;
2130}
2131static struct md_sysfs_entry md_safe_delay =
2132__ATTR(safe_mode_delay, 0644,safe_delay_show, safe_delay_store);
2133
eae1701f 2134static ssize_t
96de1e66 2135level_show(mddev_t *mddev, char *page)
eae1701f 2136{
2604b703 2137 struct mdk_personality *p = mddev->pers;
d9d166c2 2138 if (p)
eae1701f 2139 return sprintf(page, "%s\n", p->name);
d9d166c2
N		 2140 else if (mddev->clevel[0])
2141 return sprintf(page, "%s\n", mddev->clevel);
2142 else if (mddev->level != LEVEL_NONE)
2143 return sprintf(page, "%d\n", mddev->level);
2144 else
2145 return 0;
eae1701f
N		 2146}
2147
d9d166c2
N		 2148static ssize_t
2149level_store(mddev_t *mddev, const char *buf, size_t len)
2150{
2151 int rv = len;
2152 if (mddev->pers)
2153 return -EBUSY;
2154 if (len == 0)
2155 return 0;
2156 if (len >= sizeof(mddev->clevel))
2157 return -ENOSPC;
2158 strncpy(mddev->clevel, buf, len);
2159 if (mddev->clevel[len-1] == '\n')
2160 len--;
2161 mddev->clevel[len] = 0;
2162 mddev->level = LEVEL_NONE;
2163 return rv;
2164}
2165
2166static struct md_sysfs_entry md_level =
2167__ATTR(level, 0644, level_show, level_store);
eae1701f 2168
d4dbd025
N		 2169
2170static ssize_t
2171layout_show(mddev_t *mddev, char *page)
2172{
2173 /* just a number, not meaningful for all levels */
2174 return sprintf(page, "%d\n", mddev->layout);
2175}
2176
2177static ssize_t
2178layout_store(mddev_t *mddev, const char *buf, size_t len)
2179{
2180 char *e;
2181 unsigned long n = simple_strtoul(buf, &e, 10);
2182 if (mddev->pers)
2183 return -EBUSY;
2184
2185 if (!*buf || (*e && *e != '\n'))
2186 return -EINVAL;
2187
2188 mddev->layout = n;
2189 return len;
2190}
2191static struct md_sysfs_entry md_layout =
2192__ATTR(layout, 0655, layout_show, layout_store);
2193
2194
eae1701f 2195static ssize_t
96de1e66 2196raid_disks_show(mddev_t *mddev, char *page)
eae1701f 2197{
bb636547
N		 2198 if (mddev->raid_disks == 0)
2199 return 0;
eae1701f
N		 2200 return sprintf(page, "%d\n", mddev->raid_disks);
2201}
2202
da943b99
N		 2203static int update_raid_disks(mddev_t *mddev, int raid_disks);
2204
2205static ssize_t
2206raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2207{
2208 /* can only set raid_disks if array is not yet active */
2209 char *e;
2210 int rv = 0;
2211 unsigned long n = simple_strtoul(buf, &e, 10);
2212
2213 if (!*buf || (*e && *e != '\n'))
2214 return -EINVAL;
2215
2216 if (mddev->pers)
2217 rv = update_raid_disks(mddev, n);
2218 else
2219 mddev->raid_disks = n;
2220 return rv ? rv : len;
2221}
2222static struct md_sysfs_entry md_raid_disks =
2223__ATTR(raid_disks, 0644, raid_disks_show, raid_disks_store);
eae1701f 2224
3b34380a
N		 2225static ssize_t
2226chunk_size_show(mddev_t *mddev, char *page)
2227{
2228 return sprintf(page, "%d\n", mddev->chunk_size);
2229}
2230
2231static ssize_t
2232chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2233{
2234 /* can only set chunk_size if array is not yet active */
2235 char *e;
2236 unsigned long n = simple_strtoul(buf, &e, 10);
2237
2238 if (mddev->pers)
2239 return -EBUSY;
2240 if (!*buf || (*e && *e != '\n'))
2241 return -EINVAL;
2242
2243 mddev->chunk_size = n;
2244 return len;
2245}
2246static struct md_sysfs_entry md_chunk_size =
2247__ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
2248
a94213b1
N		 2249static ssize_t
2250resync_start_show(mddev_t *mddev, char *page)
2251{
2252 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2253}
2254
2255static ssize_t
2256resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2257{
2258 /* can only set chunk_size if array is not yet active */
2259 char *e;
2260 unsigned long long n = simple_strtoull(buf, &e, 10);
2261
2262 if (mddev->pers)
2263 return -EBUSY;
2264 if (!*buf || (*e && *e != '\n'))
2265 return -EINVAL;
2266
2267 mddev->recovery_cp = n;
2268 return len;
2269}
2270static struct md_sysfs_entry md_resync_start =
2271__ATTR(resync_start, 0644, resync_start_show, resync_start_store);
2272
9e653b63
N		 2273/*
2274 * The array state can be:
2275 *
2276 * clear
2277 * No devices, no size, no level
2278 * Equivalent to STOP_ARRAY ioctl
2279 * inactive
2280 * May have some settings, but array is not active
2281 * all IO results in error
2282 * When written, doesn't tear down array, but just stops it
2283 * suspended (not supported yet)
2284 * All IO requests will block. The array can be reconfigured.
2285 * Writing this, if accepted, will block until array is quiessent
2286 * readonly
2287 * no resync can happen. no superblocks get written.
2288 * write requests fail
2289 * read-auto
2290 * like readonly, but behaves like 'clean' on a write request.
2291 *
2292 * clean - no pending writes, but otherwise active.
2293 * When written to inactive array, starts without resync
2294 * If a write request arrives then
2295 * if metadata is known, mark 'dirty' and switch to 'active'.
2296 * if not known, block and switch to write-pending
2297 * If written to an active array that has pending writes, then fails.
2298 * active
2299 * fully active: IO and resync can be happening.
2300 * When written to inactive array, starts with resync
2301 *
2302 * write-pending
2303 * clean, but writes are blocked waiting for 'active' to be written.
2304 *
2305 * active-idle
2306 * like active, but no writes have been seen for a while (100msec).
2307 *
2308 */
2309enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2310 write_pending, active_idle, bad_word};
05381954 2311static char *array_states[] = {
9e653b63
N		 2312 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2313 "write-pending", "active-idle", NULL };
2314
2315static int match_word(const char *word, char **list)
2316{
2317 int n;
2318 for (n=0; list[n]; n++)
2319 if (cmd_match(word, list[n]))
2320 break;
2321 return n;
2322}
2323
2324static ssize_t
2325array_state_show(mddev_t *mddev, char *page)
2326{
2327 enum array_state st = inactive;
2328
2329 if (mddev->pers)
2330 switch(mddev->ro) {
2331 case 1:
2332 st = readonly;
2333 break;
2334 case 2:
2335 st = read_auto;
2336 break;
2337 case 0:
2338 if (mddev->in_sync)
2339 st = clean;
2340 else if (mddev->safemode)
2341 st = active_idle;
2342 else
2343 st = active;
2344 }
2345 else {
2346 if (list_empty(&mddev->disks) &&
2347 mddev->raid_disks == 0 &&
2348 mddev->size == 0)
2349 st = clear;
2350 else
2351 st = inactive;
2352 }
2353 return sprintf(page, "%s\n", array_states[st]);
2354}
2355
2356static int do_md_stop(mddev_t * mddev, int ro);
2357static int do_md_run(mddev_t * mddev);
2358static int restart_array(mddev_t *mddev);
2359
2360static ssize_t
2361array_state_store(mddev_t *mddev, const char *buf, size_t len)
2362{
2363 int err = -EINVAL;
2364 enum array_state st = match_word(buf, array_states);
2365 switch(st) {
2366 case bad_word:
2367 break;
2368 case clear:
2369 /* stopping an active array */
2370 if (mddev->pers) {
2371 if (atomic_read(&mddev->active) > 1)
2372 return -EBUSY;
2373 err = do_md_stop(mddev, 0);
2374 }
2375 break;
2376 case inactive:
2377 /* stopping an active array */
2378 if (mddev->pers) {
2379 if (atomic_read(&mddev->active) > 1)
2380 return -EBUSY;
2381 err = do_md_stop(mddev, 2);
2382 }
2383 break;
2384 case suspended:
2385 break; /* not supported yet */
2386 case readonly:
2387 if (mddev->pers)
2388 err = do_md_stop(mddev, 1);
2389 else {
2390 mddev->ro = 1;
2391 err = do_md_run(mddev);
2392 }
2393 break;
2394 case read_auto:
2395 /* stopping an active array */
2396 if (mddev->pers) {
2397 err = do_md_stop(mddev, 1);
2398 if (err == 0)
2399 mddev->ro = 2; /* FIXME mark devices writable */
2400 } else {
2401 mddev->ro = 2;
2402 err = do_md_run(mddev);
2403 }
2404 break;
2405 case clean:
2406 if (mddev->pers) {
2407 restart_array(mddev);
2408 spin_lock_irq(&mddev->write_lock);
2409 if (atomic_read(&mddev->writes_pending) == 0) {
2410 mddev->in_sync = 1;
2411 mddev->sb_dirty = 1;
2412 }
2413 spin_unlock_irq(&mddev->write_lock);
2414 } else {
2415 mddev->ro = 0;
2416 mddev->recovery_cp = MaxSector;
2417 err = do_md_run(mddev);
2418 }
2419 break;
2420 case active:
2421 if (mddev->pers) {
2422 restart_array(mddev);
2423 mddev->sb_dirty = 0;
2424 wake_up(&mddev->sb_wait);
2425 err = 0;
2426 } else {
2427 mddev->ro = 0;
2428 err = do_md_run(mddev);
2429 }
2430 break;
2431 case write_pending:
2432 case active_idle:
2433 /* these cannot be set */
2434 break;
2435 }
2436 if (err)
2437 return err;
2438 else
2439 return len;
2440}
2441static struct md_sysfs_entry md_array_state = __ATTR(array_state, 0644, array_state_show, array_state_store);
2442
6d7ff738
N		 2443static ssize_t
2444null_show(mddev_t *mddev, char *page)
2445{
2446 return -EINVAL;
2447}
2448
2449static ssize_t
2450new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2451{
2452 /* buf must be %d:%d\n? giving major and minor numbers */
2453 /* The new device is added to the array.
2454 * If the array has a persistent superblock, we read the
2455 * superblock to initialise info and check validity.
2456 * Otherwise, only checking done is that in bind_rdev_to_array,
2457 * which mainly checks size.
2458 */
2459 char *e;
2460 int major = simple_strtoul(buf, &e, 10);
2461 int minor;
2462 dev_t dev;
2463 mdk_rdev_t *rdev;
2464 int err;
2465
2466 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2467 return -EINVAL;
2468 minor = simple_strtoul(e+1, &e, 10);
2469 if (*e && *e != '\n')
2470 return -EINVAL;
2471 dev = MKDEV(major, minor);
2472 if (major != MAJOR(dev) ||
2473 minor != MINOR(dev))
2474 return -EOVERFLOW;
2475
2476
2477 if (mddev->persistent) {
2478 rdev = md_import_device(dev, mddev->major_version,
2479 mddev->minor_version);
2480 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2481 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2482 mdk_rdev_t, same_set);
2483 err = super_types[mddev->major_version]
2484 .load_super(rdev, rdev0, mddev->minor_version);
2485 if (err < 0)
2486 goto out;
2487 }
2488 } else
2489 rdev = md_import_device(dev, -1, -1);
2490
2491 if (IS_ERR(rdev))
2492 return PTR_ERR(rdev);
2493 err = bind_rdev_to_array(rdev, mddev);
2494 out:
2495 if (err)
2496 export_rdev(rdev);
2497 return err ? err : len;
2498}
2499
2500static struct md_sysfs_entry md_new_device =
2501__ATTR(new_dev, 0200, null_show, new_dev_store);
3b34380a 2502
a35b0d69
N		 2503static ssize_t
2504size_show(mddev_t *mddev, char *page)
2505{
2506 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2507}
2508
2509static int update_size(mddev_t *mddev, unsigned long size);
2510
2511static ssize_t
2512size_store(mddev_t *mddev, const char *buf, size_t len)
2513{
2514 /* If array is inactive, we can reduce the component size, but
2515 * not increase it (except from 0).
2516 * If array is active, we can try an on-line resize
2517 */
2518 char *e;
2519 int err = 0;
2520 unsigned long long size = simple_strtoull(buf, &e, 10);
2521 if (!*buf || *buf == '\n' ||
2522 (*e && *e != '\n'))
2523 return -EINVAL;
2524
2525 if (mddev->pers) {
2526 err = update_size(mddev, size);
2527 md_update_sb(mddev);
2528 } else {
2529 if (mddev->size == 0 ||
2530 mddev->size > size)
2531 mddev->size = size;
2532 else
2533 err = -ENOSPC;
2534 }
2535 return err ? err : len;
2536}
2537
2538static struct md_sysfs_entry md_size =
2539__ATTR(component_size, 0644, size_show, size_store);
2540
8bb93aac
N		 2541
2542/* Metdata version.
2543 * This is either 'none' for arrays with externally managed metadata,
2544 * or N.M for internally known formats
2545 */
2546static ssize_t
2547metadata_show(mddev_t *mddev, char *page)
2548{
2549 if (mddev->persistent)
2550 return sprintf(page, "%d.%d\n",
2551 mddev->major_version, mddev->minor_version);
2552 else
2553 return sprintf(page, "none\n");
2554}
2555
2556static ssize_t
2557metadata_store(mddev_t *mddev, const char *buf, size_t len)
2558{
2559 int major, minor;
2560 char *e;
2561 if (!list_empty(&mddev->disks))
2562 return -EBUSY;
2563
2564 if (cmd_match(buf, "none")) {
2565 mddev->persistent = 0;
2566 mddev->major_version = 0;
2567 mddev->minor_version = 90;
2568 return len;
2569 }
2570 major = simple_strtoul(buf, &e, 10);
2571 if (e==buf || *e != '.')
2572 return -EINVAL;
2573 buf = e+1;
2574 minor = simple_strtoul(buf, &e, 10);
2575 if (e==buf || *e != '\n')
2576 return -EINVAL;
2577 if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
2578 super_types[major].name == NULL)
2579 return -ENOENT;
2580 mddev->major_version = major;
2581 mddev->minor_version = minor;
2582 mddev->persistent = 1;
2583 return len;
2584}
2585
2586static struct md_sysfs_entry md_metadata =
2587__ATTR(metadata_version, 0644, metadata_show, metadata_store);
2588
24dd469d 2589static ssize_t
7eec314d 2590action_show(mddev_t *mddev, char *page)
24dd469d 2591{
7eec314d 2592 char *type = "idle";
31399d9e
N		 2593 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2594 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
ccfcc3c1
N		 2595 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2596 type = "reshape";
2597 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N		 2598 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2599 type = "resync";
2600 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2601 type = "check";
2602 else
2603 type = "repair";
2604 } else
2605 type = "recover";
2606 }
2607 return sprintf(page, "%s\n", type);
2608}
2609
2610static ssize_t
7eec314d 2611action_store(mddev_t *mddev, const char *page, size_t len)
24dd469d 2612{
7eec314d
N		 2613 if (!mddev->pers || !mddev->pers->sync_request)
2614 return -EINVAL;
2615
bce74dac 2616 if (cmd_match(page, "idle")) {
7eec314d
N		 2617 if (mddev->sync_thread) {
2618 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2619 md_unregister_thread(mddev->sync_thread);
2620 mddev->sync_thread = NULL;
2621 mddev->recovery = 0;
2622 }
03c902e1
N		 2623 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2624 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 2625 return -EBUSY;
03c902e1 2626 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
7eec314d 2627 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
16484bf5
N		 2628 else if (cmd_match(page, "reshape")) {
2629 int err;
2630 if (mddev->pers->start_reshape == NULL)
2631 return -EINVAL;
2632 err = mddev->pers->start_reshape(mddev);
2633 if (err)
2634 return err;
2635 } else {
bce74dac 2636 if (cmd_match(page, "check"))
7eec314d 2637 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2adc7d47 2638 else if (!cmd_match(page, "repair"))
7eec314d
N		 2639 return -EINVAL;
2640 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2641 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7eec314d 2642 }
03c902e1 2643 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d
N		 2644 md_wakeup_thread(mddev->thread);
2645 return len;
2646}
2647
9d88883e 2648static ssize_t
96de1e66 2649mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 2650{
2651 return sprintf(page, "%llu\n",
2652 (unsigned long long) mddev->resync_mismatches);
2653}
2654
96de1e66 2655static struct md_sysfs_entry
7eec314d 2656md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 2657
96de1e66
N		 2658
2659static struct md_sysfs_entry
2660md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 2661
88202a0c
N		 2662static ssize_t
2663sync_min_show(mddev_t *mddev, char *page)
2664{
2665 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2666 mddev->sync_speed_min ? "local": "system");
2667}
2668
2669static ssize_t
2670sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2671{
2672 int min;
2673 char *e;
2674 if (strncmp(buf, "system", 6)==0) {
2675 mddev->sync_speed_min = 0;
2676 return len;
2677 }
2678 min = simple_strtoul(buf, &e, 10);
2679 if (buf == e || (*e && *e != '\n') || min <= 0)
2680 return -EINVAL;
2681 mddev->sync_speed_min = min;
2682 return len;
2683}
2684
2685static struct md_sysfs_entry md_sync_min =
2686__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2687
2688static ssize_t
2689sync_max_show(mddev_t *mddev, char *page)
2690{
2691 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2692 mddev->sync_speed_max ? "local": "system");
2693}
2694
2695static ssize_t
2696sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2697{
2698 int max;
2699 char *e;
2700 if (strncmp(buf, "system", 6)==0) {
2701 mddev->sync_speed_max = 0;
2702 return len;
2703 }
2704 max = simple_strtoul(buf, &e, 10);
2705 if (buf == e || (*e && *e != '\n') || max <= 0)
2706 return -EINVAL;
2707 mddev->sync_speed_max = max;
2708 return len;
2709}
2710
2711static struct md_sysfs_entry md_sync_max =
2712__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2713
2714
2715static ssize_t
2716sync_speed_show(mddev_t *mddev, char *page)
2717{
2718 unsigned long resync, dt, db;
2719 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2720 dt = ((jiffies - mddev->resync_mark) / HZ);
2721 if (!dt) dt++;
2722 db = resync - (mddev->resync_mark_cnt);
2723 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2724}
2725
2726static struct md_sysfs_entry
2727md_sync_speed = __ATTR_RO(sync_speed);
2728
2729static ssize_t
2730sync_completed_show(mddev_t *mddev, char *page)
2731{
2732 unsigned long max_blocks, resync;
2733
2734 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2735 max_blocks = mddev->resync_max_sectors;
2736 else
2737 max_blocks = mddev->size << 1;
2738
2739 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2740 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2741}
2742
2743static struct md_sysfs_entry
2744md_sync_completed = __ATTR_RO(sync_completed);
2745
e464eafd
N		 2746static ssize_t
2747suspend_lo_show(mddev_t *mddev, char *page)
2748{
2749 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
2750}
2751
2752static ssize_t
2753suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
2754{
2755 char *e;
2756 unsigned long long new = simple_strtoull(buf, &e, 10);
2757
2758 if (mddev->pers->quiesce == NULL)
2759 return -EINVAL;
2760 if (buf == e || (*e && *e != '\n'))
2761 return -EINVAL;
2762 if (new >= mddev->suspend_hi ||
2763 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
2764 mddev->suspend_lo = new;
2765 mddev->pers->quiesce(mddev, 2);
2766 return len;
2767 } else
2768 return -EINVAL;
2769}
2770static struct md_sysfs_entry md_suspend_lo =
2771__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
2772
2773
2774static ssize_t
2775suspend_hi_show(mddev_t *mddev, char *page)
2776{
2777 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
2778}
2779
2780static ssize_t
2781suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
2782{
2783 char *e;
2784 unsigned long long new = simple_strtoull(buf, &e, 10);
2785
2786 if (mddev->pers->quiesce == NULL)
2787 return -EINVAL;
2788 if (buf == e || (*e && *e != '\n'))
2789 return -EINVAL;
2790 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
2791 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
2792 mddev->suspend_hi = new;
2793 mddev->pers->quiesce(mddev, 1);
2794 mddev->pers->quiesce(mddev, 0);
2795 return len;
2796 } else
2797 return -EINVAL;
2798}
2799static struct md_sysfs_entry md_suspend_hi =
2800__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
2801
2802
eae1701f
N		 2803static struct attribute *md_default_attrs[] = {
2804 &md_level.attr,
d4dbd025 2805 &md_layout.attr,
eae1701f 2806 &md_raid_disks.attr,
3b34380a 2807 &md_chunk_size.attr,
a35b0d69 2808 &md_size.attr,
a94213b1 2809 &md_resync_start.attr,
8bb93aac 2810 &md_metadata.attr,
6d7ff738 2811 &md_new_device.attr,
16f17b39 2812 &md_safe_delay.attr,
9e653b63 2813 &md_array_state.attr,
411036fa
N		 2814 NULL,
2815};
2816
2817static struct attribute *md_redundancy_attrs[] = {
24dd469d 2818 &md_scan_mode.attr,
9d88883e 2819 &md_mismatches.attr,
88202a0c
N		 2820 &md_sync_min.attr,
2821 &md_sync_max.attr,
2822 &md_sync_speed.attr,
2823 &md_sync_completed.attr,
e464eafd
N		 2824 &md_suspend_lo.attr,
2825 &md_suspend_hi.attr,
eae1701f
N		 2826 NULL,
2827};
411036fa
N		 2828static struct attribute_group md_redundancy_group = {
2829 .name = NULL,
2830 .attrs = md_redundancy_attrs,
2831};
2832
eae1701f
N		 2833
2834static ssize_t
2835md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2836{
2837 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2838 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2839 ssize_t rv;
eae1701f
N		 2840
2841 if (!entry->show)
2842 return -EIO;
5dc5cf7d
IM		 2843 rv = mddev_lock(mddev);
2844 if (!rv) {
2845 rv = entry->show(mddev, page);
2846 mddev_unlock(mddev);
2847 }
96de1e66 2848 return rv;
eae1701f
N		 2849}
2850
2851static ssize_t
2852md_attr_store(struct kobject *kobj, struct attribute *attr,
2853 const char *page, size_t length)
2854{
2855 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2856 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2857 ssize_t rv;
eae1701f
N		 2858
2859 if (!entry->store)
2860 return -EIO;
5dc5cf7d
IM		 2861 rv = mddev_lock(mddev);
2862 if (!rv) {
2863 rv = entry->store(mddev, page, length);
2864 mddev_unlock(mddev);
2865 }
96de1e66 2866 return rv;
eae1701f
N		 2867}
2868
2869static void md_free(struct kobject *ko)
2870{
2871 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2872 kfree(mddev);
2873}
2874
2875static struct sysfs_ops md_sysfs_ops = {
2876 .show = md_attr_show,
2877 .store = md_attr_store,
2878};
2879static struct kobj_type md_ktype = {
2880 .release = md_free,
2881 .sysfs_ops = &md_sysfs_ops,
2882 .default_attrs = md_default_attrs,
2883};
2884
1da177e4
LT		 2885int mdp_major = 0;
2886
2887static struct kobject *md_probe(dev_t dev, int *part, void *data)
2888{
48c9c27b 2889 static DEFINE_MUTEX(disks_mutex);
1da177e4
LT		 2890 mddev_t *mddev = mddev_find(dev);
2891 struct gendisk *disk;
2892 int partitioned = (MAJOR(dev) != MD_MAJOR);
2893 int shift = partitioned ? MdpMinorShift : 0;
2894 int unit = MINOR(dev) >> shift;
2895
2896 if (!mddev)
2897 return NULL;
2898
48c9c27b 2899 mutex_lock(&disks_mutex);
1da177e4 2900 if (mddev->gendisk) {
48c9c27b 2901 mutex_unlock(&disks_mutex);
1da177e4
LT		 2902 mddev_put(mddev);
2903 return NULL;
2904 }
2905 disk = alloc_disk(1 << shift);
2906 if (!disk) {
48c9c27b 2907 mutex_unlock(&disks_mutex);
1da177e4
LT		 2908 mddev_put(mddev);
2909 return NULL;
2910 }
2911 disk->major = MAJOR(dev);
2912 disk->first_minor = unit << shift;
2913 if (partitioned) {
2914 sprintf(disk->disk_name, "md_d%d", unit);
2915 sprintf(disk->devfs_name, "md/d%d", unit);
2916 } else {
2917 sprintf(disk->disk_name, "md%d", unit);
2918 sprintf(disk->devfs_name, "md/%d", unit);
2919 }
2920 disk->fops = &md_fops;
2921 disk->private_data = mddev;
2922 disk->queue = mddev->queue;
2923 add_disk(disk);
2924 mddev->gendisk = disk;
48c9c27b 2925 mutex_unlock(&disks_mutex);
9c791977 2926 mddev->kobj.parent = &disk->kobj;
eae1701f
N		 2927 mddev->kobj.k_name = NULL;
2928 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
2929 mddev->kobj.ktype = &md_ktype;
2930 kobject_register(&mddev->kobj);
1da177e4
LT		 2931 return NULL;
2932}
2933
1da177e4
LT		 2934static void md_safemode_timeout(unsigned long data)
2935{
2936 mddev_t *mddev = (mddev_t *) data;
2937
2938 mddev->safemode = 1;
2939 md_wakeup_thread(mddev->thread);
2940}
2941
6ff8d8ec 2942static int start_dirty_degraded;
1da177e4
LT		 2943
2944static int do_md_run(mddev_t * mddev)
2945{
2604b703 2946 int err;
1da177e4
LT		 2947 int chunk_size;
2948 struct list_head *tmp;
2949 mdk_rdev_t *rdev;
2950 struct gendisk *disk;
2604b703 2951 struct mdk_personality *pers;
1da177e4
LT		 2952 char b[BDEVNAME_SIZE];
2953
a757e64c
N		 2954 if (list_empty(&mddev->disks))
2955 /* cannot run an array with no devices.. */
1da177e4 2956 return -EINVAL;
1da177e4
LT		 2957
2958 if (mddev->pers)
2959 return -EBUSY;
2960
2961 /*
2962 * Analyze all RAID superblock(s)
2963 */
a757e64c
N		 2964 if (!mddev->raid_disks)
2965 analyze_sbs(mddev);
1da177e4
LT		 2966
2967 chunk_size = mddev->chunk_size;
2604b703
N		 2968
2969 if (chunk_size) {
1da177e4
LT		 2970 if (chunk_size > MAX_CHUNK_SIZE) {
2971 printk(KERN_ERR "too big chunk_size: %d > %d\n",
2972 chunk_size, MAX_CHUNK_SIZE);
2973 return -EINVAL;
2974 }
2975 /*
2976 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2977 */
2978 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 2979 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 2980 return -EINVAL;
2981 }
2982 if (chunk_size < PAGE_SIZE) {
2983 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
2984 chunk_size, PAGE_SIZE);
2985 return -EINVAL;
2986 }
2987
2988 /* devices must have minimum size of one chunk */
2989 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2990 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2991 continue;
2992 if (rdev->size < chunk_size / 1024) {
2993 printk(KERN_WARNING
2994 "md: Dev %s smaller than chunk_size:"
2995 " %lluk < %dk\n",
2996 bdevname(rdev->bdev,b),
2997 (unsigned long long)rdev->size,
2998 chunk_size / 1024);
2999 return -EINVAL;
3000 }
3001 }
3002 }
3003
1da177e4 3004#ifdef CONFIG_KMOD
d9d166c2
N		 3005 if (mddev->level != LEVEL_NONE)
3006 request_module("md-level-%d", mddev->level);
3007 else if (mddev->clevel[0])
3008 request_module("md-%s", mddev->clevel);
1da177e4
LT		 3009#endif
3010
3011 /*
3012 * Drop all container device buffers, from now on
3013 * the only valid external interface is through the md
3014 * device.
3015 * Also find largest hardsector size
3016 */
3017 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 3018 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3019 continue;
3020 sync_blockdev(rdev->bdev);
3021 invalidate_bdev(rdev->bdev, 0);
3022 }
3023
3024 md_probe(mddev->unit, NULL, NULL);
3025 disk = mddev->gendisk;
3026 if (!disk)
3027 return -ENOMEM;
3028
3029 spin_lock(&pers_lock);
d9d166c2 3030 pers = find_pers(mddev->level, mddev->clevel);
2604b703 3031 if (!pers || !try_module_get(pers->owner)) {
1da177e4 3032 spin_unlock(&pers_lock);
d9d166c2
N		 3033 if (mddev->level != LEVEL_NONE)
3034 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3035 mddev->level);
3036 else
3037 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3038 mddev->clevel);
1da177e4
LT		 3039 return -EINVAL;
3040 }
2604b703 3041 mddev->pers = pers;
1da177e4 3042 spin_unlock(&pers_lock);
d9d166c2
N		 3043 mddev->level = pers->level;
3044 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
1da177e4 3045
f6705578 3046 if (mddev->reshape_position != MaxSector &&
63c70c4f 3047 pers->start_reshape == NULL) {
f6705578
N		 3048 /* This personality cannot handle reshaping... */
3049 mddev->pers = NULL;
3050 module_put(pers->owner);
3051 return -EINVAL;
3052 }
3053
657390d2 3054 mddev->recovery = 0;
1da177e4 3055 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 3056 mddev->barriers_work = 1;
6ff8d8ec 3057 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 3058
f91de92e
N		 3059 if (start_readonly)
3060 mddev->ro = 2; /* read-only, but switch on first write */
3061
b15c2e57
N		 3062 err = mddev->pers->run(mddev);
3063 if (!err && mddev->pers->sync_request) {
3064 err = bitmap_create(mddev);
3065 if (err) {
3066 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3067 mdname(mddev), err);
3068 mddev->pers->stop(mddev);
3069 }
3070 }
1da177e4
LT		 3071 if (err) {
3072 printk(KERN_ERR "md: pers->run() failed ...\n");
3073 module_put(mddev->pers->owner);
3074 mddev->pers = NULL;
32a7627c
N		 3075 bitmap_destroy(mddev);
3076 return err;
1da177e4 3077 }
411036fa
N		 3078 if (mddev->pers->sync_request)
3079 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
fd9d49ca
N		 3080 else if (mddev->ro == 2) /* auto-readonly not meaningful */
3081 mddev->ro = 0;
3082
1da177e4
LT		 3083 atomic_set(&mddev->writes_pending,0);
3084 mddev->safemode = 0;
3085 mddev->safemode_timer.function = md_safemode_timeout;
3086 mddev->safemode_timer.data = (unsigned long) mddev;
16f17b39 3087 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
1da177e4 3088 mddev->in_sync = 1;
86e6ffdd
N		 3089
3090 ITERATE_RDEV(mddev,rdev,tmp)
3091 if (rdev->raid_disk >= 0) {
3092 char nm[20];
3093 sprintf(nm, "rd%d", rdev->raid_disk);
3094 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
3095 }
1da177e4
LT		 3096
3097 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 3098 md_wakeup_thread(mddev->thread);
1da177e4
LT		 3099
3100 if (mddev->sb_dirty)
3101 md_update_sb(mddev);
3102
3103 set_capacity(disk, mddev->array_size<<1);
3104
3105 /* If we call blk_queue_make_request here, it will
3106 * re-initialise max_sectors etc which may have been
3107 * refined inside -> run. So just set the bits we need to set.
3108 * Most initialisation happended when we called
3109 * blk_queue_make_request(..., md_fail_request)
3110 * earlier.
3111 */
3112 mddev->queue->queuedata = mddev;
3113 mddev->queue->make_request_fn = mddev->pers->make_request;
3114
5fd6c1dc
N		 3115 /* If there is a partially-recovered drive we need to
3116 * start recovery here. If we leave it to md_check_recovery,
3117 * it will remove the drives and not do the right thing
3118 */
3119 if (mddev->degraded) {
3120 struct list_head *rtmp;
3121 int spares = 0;
3122 ITERATE_RDEV(mddev,rdev,rtmp)
3123 if (rdev->raid_disk >= 0 &&
3124 !test_bit(In_sync, &rdev->flags) &&
3125 !test_bit(Faulty, &rdev->flags))
3126 /* complete an interrupted recovery */
3127 spares++;
3128 if (spares && mddev->pers->sync_request) {
3129 mddev->recovery = 0;
3130 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3131 mddev->sync_thread = md_register_thread(md_do_sync,
3132 mddev,
3133 "%s_resync");
3134 if (!mddev->sync_thread) {
3135 printk(KERN_ERR "%s: could not start resync"
3136 " thread...\n",
3137 mdname(mddev));
3138 /* leave the spares where they are, it shouldn't hurt */
3139 mddev->recovery = 0;
3140 } else
3141 md_wakeup_thread(mddev->sync_thread);
3142 }
3143 }
3144
1da177e4 3145 mddev->changed = 1;
d7603b7e 3146 md_new_event(mddev);
1da177e4
LT		 3147 return 0;
3148}
3149
3150static int restart_array(mddev_t *mddev)
3151{
3152 struct gendisk *disk = mddev->gendisk;
3153 int err;
3154
3155 /*
3156 * Complain if it has no devices
3157 */
3158 err = -ENXIO;
3159 if (list_empty(&mddev->disks))
3160 goto out;
3161
3162 if (mddev->pers) {
3163 err = -EBUSY;
3164 if (!mddev->ro)
3165 goto out;
3166
3167 mddev->safemode = 0;
3168 mddev->ro = 0;
3169 set_disk_ro(disk, 0);
3170
3171 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3172 mdname(mddev));
3173 /*
3174 * Kick recovery or resync if necessary
3175 */
3176 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3177 md_wakeup_thread(mddev->thread);
5fd6c1dc 3178 md_wakeup_thread(mddev->sync_thread);
1da177e4 3179 err = 0;
9e653b63 3180 } else
1da177e4 3181 err = -EINVAL;
1da177e4
LT		 3182
3183out:
3184 return err;
3185}
3186
acc55e22
N		 3187/* similar to deny_write_access, but accounts for our holding a reference
3188 * to the file ourselves */
3189static int deny_bitmap_write_access(struct file * file)
3190{
3191 struct inode *inode = file->f_mapping->host;
3192
3193 spin_lock(&inode->i_lock);
3194 if (atomic_read(&inode->i_writecount) > 1) {
3195 spin_unlock(&inode->i_lock);
3196 return -ETXTBSY;
3197 }
3198 atomic_set(&inode->i_writecount, -1);
3199 spin_unlock(&inode->i_lock);
3200
3201 return 0;
3202}
3203
3204static void restore_bitmap_write_access(struct file *file)
3205{
3206 struct inode *inode = file->f_mapping->host;
3207
3208 spin_lock(&inode->i_lock);
3209 atomic_set(&inode->i_writecount, 1);
3210 spin_unlock(&inode->i_lock);
3211}
3212
9e653b63
N		 3213/* mode:
3214 * 0 - completely stop and dis-assemble array
3215 * 1 - switch to readonly
3216 * 2 - stop but do not disassemble array
3217 */
3218static int do_md_stop(mddev_t * mddev, int mode)
1da177e4
LT		 3219{
3220 int err = 0;
3221 struct gendisk *disk = mddev->gendisk;
3222
3223 if (mddev->pers) {
3224 if (atomic_read(&mddev->active)>2) {
3225 printk("md: %s still in use.\n",mdname(mddev));
3226 return -EBUSY;
3227 }
3228
3229 if (mddev->sync_thread) {
5fd6c1dc 3230 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4
LT		 3231 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3232 md_unregister_thread(mddev->sync_thread);
3233 mddev->sync_thread = NULL;
3234 }
3235
3236 del_timer_sync(&mddev->safemode_timer);
3237
3238 invalidate_partition(disk, 0);
3239
9e653b63
N		 3240 switch(mode) {
3241 case 1: /* readonly */
1da177e4 3242 err = -ENXIO;
f91de92e 3243 if (mddev->ro==1)
1da177e4
LT		 3244 goto out;
3245 mddev->ro = 1;
9e653b63
N		 3246 break;
3247 case 0: /* disassemble */
3248 case 2: /* stop */
6b8b3e8a 3249 bitmap_flush(mddev);
a9701a30 3250 md_super_wait(mddev);
1da177e4
LT		 3251 if (mddev->ro)
3252 set_disk_ro(disk, 0);
3253 blk_queue_make_request(mddev->queue, md_fail_request);
3254 mddev->pers->stop(mddev);
411036fa
N		 3255 if (mddev->pers->sync_request)
3256 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3257
1da177e4
LT		 3258 module_put(mddev->pers->owner);
3259 mddev->pers = NULL;
3260 if (mddev->ro)
3261 mddev->ro = 0;
3262 }
5fd6c1dc 3263 if (!mddev->in_sync || mddev->sb_dirty) {
1da177e4
LT		 3264 /* mark array as shutdown cleanly */
3265 mddev->in_sync = 1;
3266 md_update_sb(mddev);
3267 }
9e653b63 3268 if (mode == 1)
1da177e4 3269 set_disk_ro(disk, 1);
5fd6c1dc 3270 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1da177e4 3271 }
32a7627c 3272
1da177e4
LT		 3273 /*
3274 * Free resources if final stop
3275 */
9e653b63 3276 if (mode == 0) {
86e6ffdd
N		 3277 mdk_rdev_t *rdev;
3278 struct list_head *tmp;
1da177e4
LT		 3279 struct gendisk *disk;
3280 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3281
978f946b
N		 3282 bitmap_destroy(mddev);
3283 if (mddev->bitmap_file) {
acc55e22 3284 restore_bitmap_write_access(mddev->bitmap_file);
978f946b
N		 3285 fput(mddev->bitmap_file);
3286 mddev->bitmap_file = NULL;
3287 }
3288 mddev->bitmap_offset = 0;
3289
86e6ffdd
N		 3290 ITERATE_RDEV(mddev,rdev,tmp)
3291 if (rdev->raid_disk >= 0) {
3292 char nm[20];
3293 sprintf(nm, "rd%d", rdev->raid_disk);
3294 sysfs_remove_link(&mddev->kobj, nm);
3295 }
3296
1da177e4
LT		 3297 export_array(mddev);
3298
3299 mddev->array_size = 0;
9e653b63
N		 3300 mddev->size = 0;
3301 mddev->raid_disks = 0;
a94213b1 3302 mddev->recovery_cp = 0;
9e653b63 3303
1da177e4
LT		 3304 disk = mddev->gendisk;
3305 if (disk)
3306 set_capacity(disk, 0);
3307 mddev->changed = 1;
a8a55c38 3308 } else if (mddev->pers)
1da177e4
LT		 3309 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3310 mdname(mddev));
3311 err = 0;
d7603b7e 3312 md_new_event(mddev);
1da177e4
LT		 3313out:
3314 return err;
3315}
3316
3317static void autorun_array(mddev_t *mddev)
3318{
3319 mdk_rdev_t *rdev;
3320 struct list_head *tmp;
3321 int err;
3322
a757e64c 3323 if (list_empty(&mddev->disks))
1da177e4 3324 return;
1da177e4
LT		 3325
3326 printk(KERN_INFO "md: running: ");
3327
3328 ITERATE_RDEV(mddev,rdev,tmp) {
3329 char b[BDEVNAME_SIZE];
3330 printk("<%s>", bdevname(rdev->bdev,b));
3331 }
3332 printk("\n");
3333
3334 err = do_md_run (mddev);
3335 if (err) {
3336 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3337 do_md_stop (mddev, 0);
3338 }
3339}
3340
3341/*
3342 * lets try to run arrays based on all disks that have arrived
3343 * until now. (those are in pending_raid_disks)
3344 *
3345 * the method: pick the first pending disk, collect all disks with
3346 * the same UUID, remove all from the pending list and put them into
3347 * the 'same_array' list. Then order this list based on superblock
3348 * update time (freshest comes first), kick out 'old' disks and
3349 * compare superblocks. If everything's fine then run it.
3350 *
3351 * If "unit" is allocated, then bump its reference count
3352 */
3353static void autorun_devices(int part)
3354{
1da177e4
LT		 3355 struct list_head *tmp;
3356 mdk_rdev_t *rdev0, *rdev;
3357 mddev_t *mddev;
3358 char b[BDEVNAME_SIZE];
3359
3360 printk(KERN_INFO "md: autorun ...\n");
3361 while (!list_empty(&pending_raid_disks)) {
3362 dev_t dev;
ad01c9e3 3363 LIST_HEAD(candidates);
1da177e4
LT		 3364 rdev0 = list_entry(pending_raid_disks.next,
3365 mdk_rdev_t, same_set);
3366
3367 printk(KERN_INFO "md: considering %s ...\n",
3368 bdevname(rdev0->bdev,b));
3369 INIT_LIST_HEAD(&candidates);
3370 ITERATE_RDEV_PENDING(rdev,tmp)
3371 if (super_90_load(rdev, rdev0, 0) >= 0) {
3372 printk(KERN_INFO "md: adding %s ...\n",
3373 bdevname(rdev->bdev,b));
3374 list_move(&rdev->same_set, &candidates);
3375 }
3376 /*
3377 * now we have a set of devices, with all of them having
3378 * mostly sane superblocks. It's time to allocate the
3379 * mddev.
3380 */
3381 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
3382 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3383 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3384 break;
3385 }
3386 if (part)
3387 dev = MKDEV(mdp_major,
3388 rdev0->preferred_minor << MdpMinorShift);
3389 else
3390 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3391
3392 md_probe(dev, NULL, NULL);
3393 mddev = mddev_find(dev);
3394 if (!mddev) {
3395 printk(KERN_ERR
3396 "md: cannot allocate memory for md drive.\n");
3397 break;
3398 }
3399 if (mddev_lock(mddev))
3400 printk(KERN_WARNING "md: %s locked, cannot run\n",
3401 mdname(mddev));
3402 else if (mddev->raid_disks || mddev->major_version
3403 || !list_empty(&mddev->disks)) {
3404 printk(KERN_WARNING
3405 "md: %s already running, cannot run %s\n",
3406 mdname(mddev), bdevname(rdev0->bdev,b));
3407 mddev_unlock(mddev);
3408 } else {
3409 printk(KERN_INFO "md: created %s\n", mdname(mddev));
3410 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
3411 list_del_init(&rdev->same_set);
3412 if (bind_rdev_to_array(rdev, mddev))
3413 export_rdev(rdev);
3414 }
3415 autorun_array(mddev);
3416 mddev_unlock(mddev);
3417 }
3418 /* on success, candidates will be empty, on error
3419 * it won't...
3420 */
3421 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
3422 export_rdev(rdev);
3423 mddev_put(mddev);
3424 }
3425 printk(KERN_INFO "md: ... autorun DONE.\n");
3426}
3427
3428/*
3429 * import RAID devices based on one partition
3430 * if possible, the array gets run as well.
3431 */
3432
3433static int autostart_array(dev_t startdev)
3434{
3435 char b[BDEVNAME_SIZE];
3436 int err = -EINVAL, i;
3437 mdp_super_t *sb = NULL;
3438 mdk_rdev_t *start_rdev = NULL, *rdev;
3439
3440 start_rdev = md_import_device(startdev, 0, 0);
3441 if (IS_ERR(start_rdev))
3442 return err;
3443
3444
3445 /* NOTE: this can only work for 0.90.0 superblocks */
3446 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
3447 if (sb->major_version != 0 ||
3448 sb->minor_version != 90 ) {
3449 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
3450 export_rdev(start_rdev);
3451 return err;
3452 }
3453
b2d444d7 3454 if (test_bit(Faulty, &start_rdev->flags)) {
1da177e4
LT		 3455 printk(KERN_WARNING
3456 "md: can not autostart based on faulty %s!\n",
3457 bdevname(start_rdev->bdev,b));
3458 export_rdev(start_rdev);
3459 return err;
3460 }
3461 list_add(&start_rdev->same_set, &pending_raid_disks);
3462
3463 for (i = 0; i < MD_SB_DISKS; i++) {
3464 mdp_disk_t *desc = sb->disks + i;
3465 dev_t dev = MKDEV(desc->major, desc->minor);
3466
3467 if (!dev)
3468 continue;
3469 if (dev == startdev)
3470 continue;
3471 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
3472 continue;
3473 rdev = md_import_device(dev, 0, 0);
3474 if (IS_ERR(rdev))
3475 continue;
3476
3477 list_add(&rdev->same_set, &pending_raid_disks);
3478 }
3479
3480 /*
3481 * possibly return codes
3482 */
3483 autorun_devices(0);
3484 return 0;
3485
3486}
3487
3488
3489static int get_version(void __user * arg)
3490{
3491 mdu_version_t ver;
3492
3493 ver.major = MD_MAJOR_VERSION;
3494 ver.minor = MD_MINOR_VERSION;
3495 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3496
3497 if (copy_to_user(arg, &ver, sizeof(ver)))
3498 return -EFAULT;
3499
3500 return 0;
3501}
3502
3503static int get_array_info(mddev_t * mddev, void __user * arg)
3504{
3505 mdu_array_info_t info;
3506 int nr,working,active,failed,spare;
3507 mdk_rdev_t *rdev;
3508 struct list_head *tmp;
3509
3510 nr=working=active=failed=spare=0;
3511 ITERATE_RDEV(mddev,rdev,tmp) {
3512 nr++;
b2d444d7 3513 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3514 failed++;
3515 else {
3516 working++;
b2d444d7 3517 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 3518 active++;
3519 else
3520 spare++;
3521 }
3522 }
3523
3524 info.major_version = mddev->major_version;
3525 info.minor_version = mddev->minor_version;
3526 info.patch_version = MD_PATCHLEVEL_VERSION;
3527 info.ctime = mddev->ctime;
3528 info.level = mddev->level;
3529 info.size = mddev->size;
284ae7ca
N		 3530 if (info.size != mddev->size) /* overflow */
3531 info.size = -1;
1da177e4
LT		 3532 info.nr_disks = nr;
3533 info.raid_disks = mddev->raid_disks;
3534 info.md_minor = mddev->md_minor;
3535 info.not_persistent= !mddev->persistent;
3536
3537 info.utime = mddev->utime;
3538 info.state = 0;
3539 if (mddev->in_sync)
3540 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 3541 if (mddev->bitmap && mddev->bitmap_offset)
3542 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 3543 info.active_disks = active;
3544 info.working_disks = working;
3545 info.failed_disks = failed;
3546 info.spare_disks = spare;
3547
3548 info.layout = mddev->layout;
3549 info.chunk_size = mddev->chunk_size;
3550
3551 if (copy_to_user(arg, &info, sizeof(info)))
3552 return -EFAULT;
3553
3554 return 0;
3555}
3556
87162a28 3557static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 3558{
3559 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3560 char *ptr, *buf = NULL;
3561 int err = -ENOMEM;
3562
3563 file = kmalloc(sizeof(*file), GFP_KERNEL);
3564 if (!file)
3565 goto out;
3566
3567 /* bitmap disabled, zero the first byte and copy out */
3568 if (!mddev->bitmap || !mddev->bitmap->file) {
3569 file->pathname[0] = '\0';
3570 goto copy_out;
3571 }
3572
3573 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3574 if (!buf)
3575 goto out;
3576
3577 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3578 if (!ptr)
3579 goto out;
3580
3581 strcpy(file->pathname, ptr);
3582
3583copy_out:
3584 err = 0;
3585 if (copy_to_user(arg, file, sizeof(*file)))
3586 err = -EFAULT;
3587out:
3588 kfree(buf);
3589 kfree(file);
3590 return err;
3591}
3592
1da177e4
LT		 3593static int get_disk_info(mddev_t * mddev, void __user * arg)
3594{
3595 mdu_disk_info_t info;
3596 unsigned int nr;
3597 mdk_rdev_t *rdev;
3598
3599 if (copy_from_user(&info, arg, sizeof(info)))
3600 return -EFAULT;
3601
3602 nr = info.number;
3603
3604 rdev = find_rdev_nr(mddev, nr);
3605 if (rdev) {
3606 info.major = MAJOR(rdev->bdev->bd_dev);
3607 info.minor = MINOR(rdev->bdev->bd_dev);
3608 info.raid_disk = rdev->raid_disk;
3609 info.state = 0;
b2d444d7 3610 if (test_bit(Faulty, &rdev->flags))
1da177e4 3611 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 3612 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 3613 info.state |= (1<<MD_DISK_ACTIVE);
3614 info.state |= (1<<MD_DISK_SYNC);
3615 }
8ddf9efe
N		 3616 if (test_bit(WriteMostly, &rdev->flags))
3617 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 3618 } else {
3619 info.major = info.minor = 0;
3620 info.raid_disk = -1;
3621 info.state = (1<<MD_DISK_REMOVED);
3622 }
3623
3624 if (copy_to_user(arg, &info, sizeof(info)))
3625 return -EFAULT;
3626
3627 return 0;
3628}
3629
3630static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3631{
3632 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3633 mdk_rdev_t *rdev;
3634 dev_t dev = MKDEV(info->major,info->minor);
3635
3636 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3637 return -EOVERFLOW;
3638
3639 if (!mddev->raid_disks) {
3640 int err;
3641 /* expecting a device which has a superblock */
3642 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3643 if (IS_ERR(rdev)) {
3644 printk(KERN_WARNING
3645 "md: md_import_device returned %ld\n",
3646 PTR_ERR(rdev));
3647 return PTR_ERR(rdev);
3648 }
3649 if (!list_empty(&mddev->disks)) {
3650 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3651 mdk_rdev_t, same_set);
3652 int err = super_types[mddev->major_version]
3653 .load_super(rdev, rdev0, mddev->minor_version);
3654 if (err < 0) {
3655 printk(KERN_WARNING
3656 "md: %s has different UUID to %s\n",
3657 bdevname(rdev->bdev,b),
3658 bdevname(rdev0->bdev,b2));
3659 export_rdev(rdev);
3660 return -EINVAL;
3661 }
3662 }
3663 err = bind_rdev_to_array(rdev, mddev);
3664 if (err)
3665 export_rdev(rdev);
3666 return err;
3667 }
3668
3669 /*
3670 * add_new_disk can be used once the array is assembled
3671 * to add "hot spares". They must already have a superblock
3672 * written
3673 */
3674 if (mddev->pers) {
3675 int err;
3676 if (!mddev->pers->hot_add_disk) {
3677 printk(KERN_WARNING
3678 "%s: personality does not support diskops!\n",
3679 mdname(mddev));
3680 return -EINVAL;
3681 }
7b1e35f6
N		 3682 if (mddev->persistent)
3683 rdev = md_import_device(dev, mddev->major_version,
3684 mddev->minor_version);
3685 else
3686 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 3687 if (IS_ERR(rdev)) {
3688 printk(KERN_WARNING
3689 "md: md_import_device returned %ld\n",
3690 PTR_ERR(rdev));
3691 return PTR_ERR(rdev);
3692 }
41158c7e
N		 3693 /* set save_raid_disk if appropriate */
3694 if (!mddev->persistent) {
3695 if (info->state & (1<<MD_DISK_SYNC) &&
3696 info->raid_disk < mddev->raid_disks)
3697 rdev->raid_disk = info->raid_disk;
3698 else
3699 rdev->raid_disk = -1;
3700 } else
3701 super_types[mddev->major_version].
3702 validate_super(mddev, rdev);
3703 rdev->saved_raid_disk = rdev->raid_disk;
3704
b2d444d7 3705 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 3706 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3707 set_bit(WriteMostly, &rdev->flags);
3708
1da177e4
LT		 3709 rdev->raid_disk = -1;
3710 err = bind_rdev_to_array(rdev, mddev);
7c7546cc
N		 3711 if (!err && !mddev->pers->hot_remove_disk) {
3712 /* If there is hot_add_disk but no hot_remove_disk
3713 * then added disks for geometry changes,
3714 * and should be added immediately.
3715 */
3716 super_types[mddev->major_version].
3717 validate_super(mddev, rdev);
3718 err = mddev->pers->hot_add_disk(mddev, rdev);
3719 if (err)
3720 unbind_rdev_from_array(rdev);
3721 }
1da177e4
LT		 3722 if (err)
3723 export_rdev(rdev);
c361777f
N		 3724
3725 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 3726 md_wakeup_thread(mddev->thread);
1da177e4
LT		 3727 return err;
3728 }
3729
3730 /* otherwise, add_new_disk is only allowed
3731 * for major_version==0 superblocks
3732 */
3733 if (mddev->major_version != 0) {
3734 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3735 mdname(mddev));
3736 return -EINVAL;
3737 }
3738
3739 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3740 int err;
3741 rdev = md_import_device (dev, -1, 0);
3742 if (IS_ERR(rdev)) {
3743 printk(KERN_WARNING
3744 "md: error, md_import_device() returned %ld\n",
3745 PTR_ERR(rdev));
3746 return PTR_ERR(rdev);
3747 }
3748 rdev->desc_nr = info->number;
3749 if (info->raid_disk < mddev->raid_disks)
3750 rdev->raid_disk = info->raid_disk;
3751 else
3752 rdev->raid_disk = -1;
3753
b2d444d7
N		 3754 rdev->flags = 0;
3755
1da177e4 3756 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 3757 if (info->state & (1<<MD_DISK_SYNC))
3758 set_bit(In_sync, &rdev->flags);
1da177e4 3759
8ddf9efe
N		 3760 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3761 set_bit(WriteMostly, &rdev->flags);
3762
1da177e4
LT		 3763 if (!mddev->persistent) {
3764 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3765 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3766 } else
3767 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3768 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3769
2bf071bf
N		 3770 err = bind_rdev_to_array(rdev, mddev);
3771 if (err) {
3772 export_rdev(rdev);
3773 return err;
3774 }
1da177e4
LT		 3775 }
3776
3777 return 0;
3778}
3779
3780static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3781{
3782 char b[BDEVNAME_SIZE];
3783 mdk_rdev_t *rdev;
3784
3785 if (!mddev->pers)
3786 return -ENODEV;
3787
3788 rdev = find_rdev(mddev, dev);
3789 if (!rdev)
3790 return -ENXIO;
3791
3792 if (rdev->raid_disk >= 0)
3793 goto busy;
3794
3795 kick_rdev_from_array(rdev);
3796 md_update_sb(mddev);
d7603b7e 3797 md_new_event(mddev);
1da177e4
LT		 3798
3799 return 0;
3800busy:
3801 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3802 bdevname(rdev->bdev,b), mdname(mddev));
3803 return -EBUSY;
3804}
3805
3806static int hot_add_disk(mddev_t * mddev, dev_t dev)
3807{
3808 char b[BDEVNAME_SIZE];
3809 int err;
3810 unsigned int size;
3811 mdk_rdev_t *rdev;
3812
3813 if (!mddev->pers)
3814 return -ENODEV;
3815
3816 if (mddev->major_version != 0) {
3817 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3818 " version-0 superblocks.\n",
3819 mdname(mddev));
3820 return -EINVAL;
3821 }
3822 if (!mddev->pers->hot_add_disk) {
3823 printk(KERN_WARNING
3824 "%s: personality does not support diskops!\n",
3825 mdname(mddev));
3826 return -EINVAL;
3827 }
3828
3829 rdev = md_import_device (dev, -1, 0);
3830 if (IS_ERR(rdev)) {
3831 printk(KERN_WARNING
3832 "md: error, md_import_device() returned %ld\n",
3833 PTR_ERR(rdev));
3834 return -EINVAL;
3835 }
3836
3837 if (mddev->persistent)
3838 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3839 else
3840 rdev->sb_offset =
3841 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3842
3843 size = calc_dev_size(rdev, mddev->chunk_size);
3844 rdev->size = size;
3845
b2d444d7 3846 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 3847 printk(KERN_WARNING
3848 "md: can not hot-add faulty %s disk to %s!\n",
3849 bdevname(rdev->bdev,b), mdname(mddev));
3850 err = -EINVAL;
3851 goto abort_export;
3852 }
b2d444d7 3853 clear_bit(In_sync, &rdev->flags);
1da177e4 3854 rdev->desc_nr = -1;
2bf071bf
N		 3855 err = bind_rdev_to_array(rdev, mddev);
3856 if (err)
3857 goto abort_export;
1da177e4
LT		 3858
3859 /*
3860 * The rest should better be atomic, we can have disk failures
3861 * noticed in interrupt contexts ...
3862 */
3863
3864 if (rdev->desc_nr == mddev->max_disks) {
3865 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
3866 mdname(mddev));
3867 err = -EBUSY;
3868 goto abort_unbind_export;
3869 }
3870
3871 rdev->raid_disk = -1;
3872
3873 md_update_sb(mddev);
3874
3875 /*
3876 * Kick recovery, maybe this spare has to be added to the
3877 * array immediately.
3878 */
3879 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3880 md_wakeup_thread(mddev->thread);
d7603b7e 3881 md_new_event(mddev);
1da177e4
LT		 3882 return 0;
3883
3884abort_unbind_export:
3885 unbind_rdev_from_array(rdev);
3886
3887abort_export:
3888 export_rdev(rdev);
3889 return err;
3890}
3891
32a7627c
N		 3892static int set_bitmap_file(mddev_t *mddev, int fd)
3893{
3894 int err;
3895
36fa3063
N		 3896 if (mddev->pers) {
3897 if (!mddev->pers->quiesce)
3898 return -EBUSY;
3899 if (mddev->recovery || mddev->sync_thread)
3900 return -EBUSY;
3901 /* we should be able to change the bitmap.. */
3902 }
32a7627c 3903
32a7627c 3904
36fa3063
N		 3905 if (fd >= 0) {
3906 if (mddev->bitmap)
3907 return -EEXIST; /* cannot add when bitmap is present */
3908 mddev->bitmap_file = fget(fd);
32a7627c 3909
36fa3063
N		 3910 if (mddev->bitmap_file == NULL) {
3911 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
3912 mdname(mddev));
3913 return -EBADF;
3914 }
3915
3916 err = deny_bitmap_write_access(mddev->bitmap_file);
3917 if (err) {
3918 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
3919 mdname(mddev));
3920 fput(mddev->bitmap_file);
3921 mddev->bitmap_file = NULL;
3922 return err;
3923 }
a654b9d8 3924 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 3925 } else if (mddev->bitmap == NULL)
3926 return -ENOENT; /* cannot remove what isn't there */
3927 err = 0;
3928 if (mddev->pers) {
3929 mddev->pers->quiesce(mddev, 1);
3930 if (fd >= 0)
3931 err = bitmap_create(mddev);
d7375ab3 3932 if (fd < 0 || err) {
36fa3063 3933 bitmap_destroy(mddev);
d7375ab3
N		 3934 fd = -1; /* make sure to put the file */
3935 }
36fa3063 3936 mddev->pers->quiesce(mddev, 0);
d7375ab3
N		 3937 }
3938 if (fd < 0) {
acc55e22
N		 3939 if (mddev->bitmap_file) {
3940 restore_bitmap_write_access(mddev->bitmap_file);
36fa3063 3941 fput(mddev->bitmap_file);
acc55e22 3942 }
36fa3063
N		 3943 mddev->bitmap_file = NULL;
3944 }
3945
32a7627c
N		 3946 return err;
3947}
3948
1da177e4
LT		 3949/*
3950 * set_array_info is used two different ways
3951 * The original usage is when creating a new array.
3952 * In this usage, raid_disks is > 0 and it together with
3953 * level, size, not_persistent,layout,chunksize determine the
3954 * shape of the array.
3955 * This will always create an array with a type-0.90.0 superblock.
3956 * The newer usage is when assembling an array.
3957 * In this case raid_disks will be 0, and the major_version field is
3958 * use to determine which style super-blocks are to be found on the devices.
3959 * The minor and patch _version numbers are also kept incase the
3960 * super_block handler wishes to interpret them.
3961 */
3962static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
3963{
3964
3965 if (info->raid_disks == 0) {
3966 /* just setting version number for superblock loading */
3967 if (info->major_version < 0 ||
3968 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
3969 super_types[info->major_version].name == NULL) {
3970 /* maybe try to auto-load a module? */
3971 printk(KERN_INFO
3972 "md: superblock version %d not known\n",
3973 info->major_version);
3974 return -EINVAL;
3975 }
3976 mddev->major_version = info->major_version;
3977 mddev->minor_version = info->minor_version;
3978 mddev->patch_version = info->patch_version;
3979 return 0;
3980 }
3981 mddev->major_version = MD_MAJOR_VERSION;
3982 mddev->minor_version = MD_MINOR_VERSION;
3983 mddev->patch_version = MD_PATCHLEVEL_VERSION;
3984 mddev->ctime = get_seconds();
3985
3986 mddev->level = info->level;
17115e03 3987 mddev->clevel[0] = 0;
1da177e4
LT		 3988 mddev->size = info->size;
3989 mddev->raid_disks = info->raid_disks;
3990 /* don't set md_minor, it is determined by which /dev/md* was
3991 * openned
3992 */
3993 if (info->state & (1<<MD_SB_CLEAN))
3994 mddev->recovery_cp = MaxSector;
3995 else
3996 mddev->recovery_cp = 0;
3997 mddev->persistent = ! info->not_persistent;
3998
3999 mddev->layout = info->layout;
4000 mddev->chunk_size = info->chunk_size;
4001
4002 mddev->max_disks = MD_SB_DISKS;
4003
4004 mddev->sb_dirty = 1;
4005
b2a2703c
N		 4006 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4007 mddev->bitmap_offset = 0;
4008
f6705578
N		 4009 mddev->reshape_position = MaxSector;
4010
1da177e4
LT		 4011 /*
4012 * Generate a 128 bit UUID
4013 */
4014 get_random_bytes(mddev->uuid, 16);
4015
f6705578
N		 4016 mddev->new_level = mddev->level;
4017 mddev->new_chunk = mddev->chunk_size;
4018 mddev->new_layout = mddev->layout;
4019 mddev->delta_disks = 0;
4020
1da177e4
LT		 4021 return 0;
4022}
4023
a35b0d69
N		 4024static int update_size(mddev_t *mddev, unsigned long size)
4025{
4026 mdk_rdev_t * rdev;
4027 int rv;
4028 struct list_head *tmp;
8ddeeae5 4029 int fit = (size == 0);
a35b0d69
N		 4030
4031 if (mddev->pers->resize == NULL)
4032 return -EINVAL;
4033 /* The "size" is the amount of each device that is used.
4034 * This can only make sense for arrays with redundancy.
4035 * linear and raid0 always use whatever space is available
4036 * We can only consider changing the size if no resync
4037 * or reconstruction is happening, and if the new size
4038 * is acceptable. It must fit before the sb_offset or,
4039 * if that is <data_offset, it must fit before the
4040 * size of each device.
4041 * If size is zero, we find the largest size that fits.
4042 */
4043 if (mddev->sync_thread)
4044 return -EBUSY;
4045 ITERATE_RDEV(mddev,rdev,tmp) {
4046 sector_t avail;
a35b0d69
N		 4047 if (rdev->sb_offset > rdev->data_offset)
4048 avail = (rdev->sb_offset*2) - rdev->data_offset;
4049 else
4050 avail = get_capacity(rdev->bdev->bd_disk)
4051 - rdev->data_offset;
4052 if (fit && (size == 0 || size > avail/2))
4053 size = avail/2;
4054 if (avail < ((sector_t)size << 1))
4055 return -ENOSPC;
4056 }
4057 rv = mddev->pers->resize(mddev, (sector_t)size *2);
4058 if (!rv) {
4059 struct block_device *bdev;
4060
4061 bdev = bdget_disk(mddev->gendisk, 0);
4062 if (bdev) {
1b1dcc1b 4063 mutex_lock(&bdev->bd_inode->i_mutex);
6d89332b 4064 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
1b1dcc1b 4065 mutex_unlock(&bdev->bd_inode->i_mutex);
a35b0d69
N		 4066 bdput(bdev);
4067 }
4068 }
4069 return rv;
4070}
4071
da943b99
N		 4072static int update_raid_disks(mddev_t *mddev, int raid_disks)
4073{
4074 int rv;
4075 /* change the number of raid disks */
63c70c4f 4076 if (mddev->pers->check_reshape == NULL)
da943b99
N		 4077 return -EINVAL;
4078 if (raid_disks <= 0 ||
4079 raid_disks >= mddev->max_disks)
4080 return -EINVAL;
63c70c4f 4081 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
da943b99 4082 return -EBUSY;
63c70c4f
N		 4083 mddev->delta_disks = raid_disks - mddev->raid_disks;
4084
4085 rv = mddev->pers->check_reshape(mddev);
da943b99
N		 4086 return rv;
4087}
4088
4089
1da177e4
LT		 4090/*
4091 * update_array_info is used to change the configuration of an
4092 * on-line array.
4093 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4094 * fields in the info are checked against the array.
4095 * Any differences that cannot be handled will cause an error.
4096 * Normally, only one change can be managed at a time.
4097 */
4098static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4099{
4100 int rv = 0;
4101 int cnt = 0;
36fa3063
N		 4102 int state = 0;
4103
4104 /* calculate expected state,ignoring low bits */
4105 if (mddev->bitmap && mddev->bitmap_offset)
4106 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 4107
4108 if (mddev->major_version != info->major_version ||
4109 mddev->minor_version != info->minor_version ||
4110/* mddev->patch_version != info->patch_version || */
4111 mddev->ctime != info->ctime ||
4112 mddev->level != info->level ||
4113/* mddev->layout != info->layout || */
4114 !mddev->persistent != info->not_persistent||
36fa3063
N		 4115 mddev->chunk_size != info->chunk_size ||
4116 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4117 ((state^info->state) & 0xfffffe00)
4118 )
1da177e4
LT		 4119 return -EINVAL;
4120 /* Check there is only one change */
284ae7ca 4121 if (info->size >= 0 && mddev->size != info->size) cnt++;
1da177e4
LT		 4122 if (mddev->raid_disks != info->raid_disks) cnt++;
4123 if (mddev->layout != info->layout) cnt++;
36fa3063 4124 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 4125 if (cnt == 0) return 0;
4126 if (cnt > 1) return -EINVAL;
4127
4128 if (mddev->layout != info->layout) {
4129 /* Change layout
4130 * we don't need to do anything at the md level, the
4131 * personality will take care of it all.
4132 */
4133 if (mddev->pers->reconfig == NULL)
4134 return -EINVAL;
4135 else
4136 return mddev->pers->reconfig(mddev, info->layout, -1);
4137 }
284ae7ca 4138 if (info->size >= 0 && mddev->size != info->size)
a35b0d69
N		 4139 rv = update_size(mddev, info->size);
4140
da943b99
N		 4141 if (mddev->raid_disks != info->raid_disks)
4142 rv = update_raid_disks(mddev, info->raid_disks);
4143
36fa3063
N		 4144 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4145 if (mddev->pers->quiesce == NULL)
4146 return -EINVAL;
4147 if (mddev->recovery || mddev->sync_thread)
4148 return -EBUSY;
4149 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4150 /* add the bitmap */
4151 if (mddev->bitmap)
4152 return -EEXIST;
4153 if (mddev->default_bitmap_offset == 0)
4154 return -EINVAL;
4155 mddev->bitmap_offset = mddev->default_bitmap_offset;
4156 mddev->pers->quiesce(mddev, 1);
4157 rv = bitmap_create(mddev);
4158 if (rv)
4159 bitmap_destroy(mddev);
4160 mddev->pers->quiesce(mddev, 0);
4161 } else {
4162 /* remove the bitmap */
4163 if (!mddev->bitmap)
4164 return -ENOENT;
4165 if (mddev->bitmap->file)
4166 return -EINVAL;
4167 mddev->pers->quiesce(mddev, 1);
4168 bitmap_destroy(mddev);
4169 mddev->pers->quiesce(mddev, 0);
4170 mddev->bitmap_offset = 0;
4171 }
4172 }
1da177e4
LT		 4173 md_update_sb(mddev);
4174 return rv;
4175}
4176
4177static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4178{
4179 mdk_rdev_t *rdev;
4180
4181 if (mddev->pers == NULL)
4182 return -ENODEV;
4183
4184 rdev = find_rdev(mddev, dev);
4185 if (!rdev)
4186 return -ENODEV;
4187
4188 md_error(mddev, rdev);
4189 return 0;
4190}
4191
a885c8c4
CH		 4192static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4193{
4194 mddev_t *mddev = bdev->bd_disk->private_data;
4195
4196 geo->heads = 2;
4197 geo->sectors = 4;
4198 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4199 return 0;
4200}
4201
1da177e4
LT		 4202static int md_ioctl(struct inode *inode, struct file *file,
4203 unsigned int cmd, unsigned long arg)
4204{
4205 int err = 0;
4206 void __user *argp = (void __user *)arg;
1da177e4
LT		 4207 mddev_t *mddev = NULL;
4208
4209 if (!capable(CAP_SYS_ADMIN))
4210 return -EACCES;
4211
4212 /*
4213 * Commands dealing with the RAID driver but not any
4214 * particular array:
4215 */
4216 switch (cmd)
4217 {
4218 case RAID_VERSION:
4219 err = get_version(argp);
4220 goto done;
4221
4222 case PRINT_RAID_DEBUG:
4223 err = 0;
4224 md_print_devices();
4225 goto done;
4226
4227#ifndef MODULE
4228 case RAID_AUTORUN:
4229 err = 0;
4230 autostart_arrays(arg);
4231 goto done;
4232#endif
4233 default:;
4234 }
4235
4236 /*
4237 * Commands creating/starting a new array:
4238 */
4239
4240 mddev = inode->i_bdev->bd_disk->private_data;
4241
4242 if (!mddev) {
4243 BUG();
4244 goto abort;
4245 }
4246
4247
4248 if (cmd == START_ARRAY) {
4249 /* START_ARRAY doesn't need to lock the array as autostart_array
4250 * does the locking, and it could even be a different array
4251 */
4252 static int cnt = 3;
4253 if (cnt > 0 ) {
4254 printk(KERN_WARNING
4255 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
e8a00334 4256 "This will not be supported beyond July 2006\n",
1da177e4
LT		 4257 current->comm, current->pid);
4258 cnt--;
4259 }
4260 err = autostart_array(new_decode_dev(arg));
4261 if (err) {
4262 printk(KERN_WARNING "md: autostart failed!\n");
4263 goto abort;
4264 }
4265 goto done;
4266 }
4267
4268 err = mddev_lock(mddev);
4269 if (err) {
4270 printk(KERN_INFO
4271 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4272 err, cmd);
4273 goto abort;
4274 }
4275
4276 switch (cmd)
4277 {
4278 case SET_ARRAY_INFO:
4279 {
4280 mdu_array_info_t info;
4281 if (!arg)
4282 memset(&info, 0, sizeof(info));
4283 else if (copy_from_user(&info, argp, sizeof(info))) {
4284 err = -EFAULT;
4285 goto abort_unlock;
4286 }
4287 if (mddev->pers) {
4288 err = update_array_info(mddev, &info);
4289 if (err) {
4290 printk(KERN_WARNING "md: couldn't update"
4291 " array info. %d\n", err);
4292 goto abort_unlock;
4293 }
4294 goto done_unlock;
4295 }
4296 if (!list_empty(&mddev->disks)) {
4297 printk(KERN_WARNING
4298 "md: array %s already has disks!\n",
4299 mdname(mddev));
4300 err = -EBUSY;
4301 goto abort_unlock;
4302 }
4303 if (mddev->raid_disks) {
4304 printk(KERN_WARNING
4305 "md: array %s already initialised!\n",
4306 mdname(mddev));
4307 err = -EBUSY;
4308 goto abort_unlock;
4309 }
4310 err = set_array_info(mddev, &info);
4311 if (err) {
4312 printk(KERN_WARNING "md: couldn't set"
4313 " array info. %d\n", err);
4314 goto abort_unlock;
4315 }
4316 }
4317 goto done_unlock;
4318
4319 default:;
4320 }
4321
4322 /*
4323 * Commands querying/configuring an existing array:
4324 */
32a7627c
N		 4325 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4326 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
4327 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4328 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
1da177e4
LT		 4329 err = -ENODEV;
4330 goto abort_unlock;
4331 }
4332
4333 /*
4334 * Commands even a read-only array can execute:
4335 */
4336 switch (cmd)
4337 {
4338 case GET_ARRAY_INFO:
4339 err = get_array_info(mddev, argp);
4340 goto done_unlock;
4341
32a7627c 4342 case GET_BITMAP_FILE:
87162a28 4343 err = get_bitmap_file(mddev, argp);
32a7627c
N		 4344 goto done_unlock;
4345
1da177e4
LT		 4346 case GET_DISK_INFO:
4347 err = get_disk_info(mddev, argp);
4348 goto done_unlock;
4349
4350 case RESTART_ARRAY_RW:
4351 err = restart_array(mddev);
4352 goto done_unlock;
4353
4354 case STOP_ARRAY:
4355 err = do_md_stop (mddev, 0);
4356 goto done_unlock;
4357
4358 case STOP_ARRAY_RO:
4359 err = do_md_stop (mddev, 1);
4360 goto done_unlock;
4361
4362 /*
4363 * We have a problem here : there is no easy way to give a CHS
4364 * virtual geometry. We currently pretend that we have a 2 heads
4365 * 4 sectors (with a BIG number of cylinders...). This drives
4366 * dosfs just mad... ;-)
4367 */
1da177e4
LT		 4368 }
4369
4370 /*
4371 * The remaining ioctls are changing the state of the
f91de92e
N		 4372 * superblock, so we do not allow them on read-only arrays.
4373 * However non-MD ioctls (e.g. get-size) will still come through
4374 * here and hit the 'default' below, so only disallow
4375 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 4376 */
f91de92e
N		 4377 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4378 mddev->ro && mddev->pers) {
4379 if (mddev->ro == 2) {
4380 mddev->ro = 0;
4381 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4382 md_wakeup_thread(mddev->thread);
4383
4384 } else {
4385 err = -EROFS;
4386 goto abort_unlock;
4387 }
1da177e4
LT		 4388 }
4389
4390 switch (cmd)
4391 {
4392 case ADD_NEW_DISK:
4393 {
4394 mdu_disk_info_t info;
4395 if (copy_from_user(&info, argp, sizeof(info)))
4396 err = -EFAULT;
4397 else
4398 err = add_new_disk(mddev, &info);
4399 goto done_unlock;
4400 }
4401
4402 case HOT_REMOVE_DISK:
4403 err = hot_remove_disk(mddev, new_decode_dev(arg));
4404 goto done_unlock;
4405
4406 case HOT_ADD_DISK:
4407 err = hot_add_disk(mddev, new_decode_dev(arg));
4408 goto done_unlock;
4409
4410 case SET_DISK_FAULTY:
4411 err = set_disk_faulty(mddev, new_decode_dev(arg));
4412 goto done_unlock;
4413
4414 case RUN_ARRAY:
4415 err = do_md_run (mddev);
4416 goto done_unlock;
4417
32a7627c
N		 4418 case SET_BITMAP_FILE:
4419 err = set_bitmap_file(mddev, (int)arg);
4420 goto done_unlock;
4421
1da177e4 4422 default:
1da177e4
LT		 4423 err = -EINVAL;
4424 goto abort_unlock;
4425 }
4426
4427done_unlock:
4428abort_unlock:
4429 mddev_unlock(mddev);
4430
4431 return err;
4432done:
4433 if (err)
4434 MD_BUG();
4435abort:
4436 return err;
4437}
4438
4439static int md_open(struct inode *inode, struct file *file)
4440{
4441 /*
4442 * Succeed if we can lock the mddev, which confirms that
4443 * it isn't being stopped right now.
4444 */
4445 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4446 int err;
4447
4448 if ((err = mddev_lock(mddev)))
4449 goto out;
4450
4451 err = 0;
4452 mddev_get(mddev);
4453 mddev_unlock(mddev);
4454
4455 check_disk_change(inode->i_bdev);
4456 out:
4457 return err;
4458}
4459
4460static int md_release(struct inode *inode, struct file * file)
4461{
4462 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4463
4464 if (!mddev)
4465 BUG();
4466 mddev_put(mddev);
4467
4468 return 0;
4469}
4470
4471static int md_media_changed(struct gendisk *disk)
4472{
4473 mddev_t *mddev = disk->private_data;
4474
4475 return mddev->changed;
4476}
4477
4478static int md_revalidate(struct gendisk *disk)
4479{
4480 mddev_t *mddev = disk->private_data;
4481
4482 mddev->changed = 0;
4483 return 0;
4484}
4485static struct block_device_operations md_fops =
4486{
4487 .owner = THIS_MODULE,
4488 .open = md_open,
4489 .release = md_release,
4490 .ioctl = md_ioctl,
a885c8c4 4491 .getgeo = md_getgeo,
1da177e4
LT		 4492 .media_changed = md_media_changed,
4493 .revalidate_disk= md_revalidate,
4494};
4495
75c96f85 4496static int md_thread(void * arg)
1da177e4
LT		 4497{
4498 mdk_thread_t *thread = arg;
4499
1da177e4
LT		 4500 /*
4501 * md_thread is a 'system-thread', it's priority should be very
4502 * high. We avoid resource deadlocks individually in each
4503 * raid personality. (RAID5 does preallocation) We also use RR and
4504 * the very same RT priority as kswapd, thus we will never get
4505 * into a priority inversion deadlock.
4506 *
4507 * we definitely have to have equal or higher priority than
4508 * bdflush, otherwise bdflush will deadlock if there are too
4509 * many dirty RAID5 blocks.
4510 */
1da177e4 4511
6985c43f 4512 allow_signal(SIGKILL);
a6fb0934 4513 while (!kthread_should_stop()) {
1da177e4 4514
93588e22
N		 4515 /* We need to wait INTERRUPTIBLE so that
4516 * we don't add to the load-average.
4517 * That means we need to be sure no signals are
4518 * pending
4519 */
4520 if (signal_pending(current))
4521 flush_signals(current);
4522
4523 wait_event_interruptible_timeout
4524 (thread->wqueue,
4525 test_bit(THREAD_WAKEUP, &thread->flags)
4526 || kthread_should_stop(),
4527 thread->timeout);
3e1d1d28 4528 try_to_freeze();
1da177e4
LT		 4529
4530 clear_bit(THREAD_WAKEUP, &thread->flags);
4531
787453c2 4532 thread->run(thread->mddev);
1da177e4 4533 }
a6fb0934 4534
1da177e4
LT		 4535 return 0;
4536}
4537
4538void md_wakeup_thread(mdk_thread_t *thread)
4539{
4540 if (thread) {
4541 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4542 set_bit(THREAD_WAKEUP, &thread->flags);
4543 wake_up(&thread->wqueue);
4544 }
4545}
4546
4547mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4548 const char *name)
4549{
4550 mdk_thread_t *thread;
1da177e4 4551
9ffae0cf 4552 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 4553 if (!thread)
4554 return NULL;
4555
1da177e4
LT		 4556 init_waitqueue_head(&thread->wqueue);
4557
1da177e4
LT		 4558 thread->run = run;
4559 thread->mddev = mddev;
32a7627c 4560 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 4561 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 4562 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 4563 kfree(thread);
4564 return NULL;
4565 }
1da177e4
LT		 4566 return thread;
4567}
4568
1da177e4
LT		 4569void md_unregister_thread(mdk_thread_t *thread)
4570{
d28446fe 4571 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
a6fb0934
N		 4572
4573 kthread_stop(thread->tsk);
1da177e4
LT		 4574 kfree(thread);
4575}
4576
4577void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4578{
4579 if (!mddev) {
4580 MD_BUG();
4581 return;
4582 }
4583
b2d444d7 4584 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 4585 return;
32a7627c 4586/*
1da177e4
LT		 4587 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4588 mdname(mddev),
4589 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4590 __builtin_return_address(0),__builtin_return_address(1),
4591 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 4592*/
1da177e4
LT		 4593 if (!mddev->pers->error_handler)
4594 return;
4595 mddev->pers->error_handler(mddev,rdev);
4596 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4597 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4598 md_wakeup_thread(mddev->thread);
c331eb04 4599 md_new_event_inintr(mddev);
1da177e4
LT		 4600}
4601
4602/* seq_file implementation /proc/mdstat */
4603
4604static void status_unused(struct seq_file *seq)
4605{
4606 int i = 0;
4607 mdk_rdev_t *rdev;
4608 struct list_head *tmp;
4609
4610 seq_printf(seq, "unused devices: ");
4611
4612 ITERATE_RDEV_PENDING(rdev,tmp) {
4613 char b[BDEVNAME_SIZE];
4614 i++;
4615 seq_printf(seq, "%s ",
4616 bdevname(rdev->bdev,b));
4617 }
4618 if (!i)
4619 seq_printf(seq, "<none>");
4620
4621 seq_printf(seq, "\n");
4622}
4623
4624
4625static void status_resync(struct seq_file *seq, mddev_t * mddev)
4626{
4588b42e
N		 4627 sector_t max_blocks, resync, res;
4628 unsigned long dt, db, rt;
4629 int scale;
4630 unsigned int per_milli;
1da177e4
LT		 4631
4632 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4633
4634 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4635 max_blocks = mddev->resync_max_sectors >> 1;
4636 else
4637 max_blocks = mddev->size;
4638
4639 /*
4640 * Should not happen.
4641 */
4642 if (!max_blocks) {
4643 MD_BUG();
4644 return;
4645 }
4588b42e
N		 4646 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4647 * in a sector_t, and (max_blocks>>scale) will fit in a
4648 * u32, as those are the requirements for sector_div.
4649 * Thus 'scale' must be at least 10
4650 */
4651 scale = 10;
4652 if (sizeof(sector_t) > sizeof(unsigned long)) {
4653 while ( max_blocks/2 > (1ULL<<(scale+32)))
4654 scale++;
4655 }
4656 res = (resync>>scale)*1000;
4657 sector_div(res, (u32)((max_blocks>>scale)+1));
4658
4659 per_milli = res;
1da177e4 4660 {
4588b42e 4661 int i, x = per_milli/50, y = 20-x;
1da177e4
LT		 4662 seq_printf(seq, "[");
4663 for (i = 0; i < x; i++)
4664 seq_printf(seq, "=");
4665 seq_printf(seq, ">");
4666 for (i = 0; i < y; i++)
4667 seq_printf(seq, ".");
4668 seq_printf(seq, "] ");
4669 }
4588b42e 4670 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
ccfcc3c1
N		 4671 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
4672 "reshape" :
1da177e4 4673 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
ccfcc3c1 4674 "resync" : "recovery")),
4588b42e
N		 4675 per_milli/10, per_milli % 10,
4676 (unsigned long long) resync,
4677 (unsigned long long) max_blocks);
1da177e4
LT		 4678
4679 /*
4680 * We do not want to overflow, so the order of operands and
4681 * the * 100 / 100 trick are important. We do a +1 to be
4682 * safe against division by zero. We only estimate anyway.
4683 *
4684 * dt: time from mark until now
4685 * db: blocks written from mark until now
4686 * rt: remaining time
4687 */
4688 dt = ((jiffies - mddev->resync_mark) / HZ);
4689 if (!dt) dt++;
4690 db = resync - (mddev->resync_mark_cnt/2);
4588b42e 4691 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/100+1)))/100;
1da177e4
LT		 4692
4693 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4694
4695 seq_printf(seq, " speed=%ldK/sec", db/dt);
4696}
4697
4698static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4699{
4700 struct list_head *tmp;
4701 loff_t l = *pos;
4702 mddev_t *mddev;
4703
4704 if (l >= 0x10000)
4705 return NULL;
4706 if (!l--)
4707 /* header */
4708 return (void*)1;
4709
4710 spin_lock(&all_mddevs_lock);
4711 list_for_each(tmp,&all_mddevs)
4712 if (!l--) {
4713 mddev = list_entry(tmp, mddev_t, all_mddevs);
4714 mddev_get(mddev);
4715 spin_unlock(&all_mddevs_lock);
4716 return mddev;
4717 }
4718 spin_unlock(&all_mddevs_lock);
4719 if (!l--)
4720 return (void*)2;/* tail */
4721 return NULL;
4722}
4723
4724static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4725{
4726 struct list_head *tmp;
4727 mddev_t *next_mddev, *mddev = v;
4728
4729 ++*pos;
4730 if (v == (void*)2)
4731 return NULL;
4732
4733 spin_lock(&all_mddevs_lock);
4734 if (v == (void*)1)
4735 tmp = all_mddevs.next;
4736 else
4737 tmp = mddev->all_mddevs.next;
4738 if (tmp != &all_mddevs)
4739 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4740 else {
4741 next_mddev = (void*)2;
4742 *pos = 0x10000;
4743 }
4744 spin_unlock(&all_mddevs_lock);
4745
4746 if (v != (void*)1)
4747 mddev_put(mddev);
4748 return next_mddev;
4749
4750}
4751
4752static void md_seq_stop(struct seq_file *seq, void *v)
4753{
4754 mddev_t *mddev = v;
4755
4756 if (mddev && v != (void*)1 && v != (void*)2)
4757 mddev_put(mddev);
4758}
4759
d7603b7e
N		 4760struct mdstat_info {
4761 int event;
4762};
4763
1da177e4
LT		 4764static int md_seq_show(struct seq_file *seq, void *v)
4765{
4766 mddev_t *mddev = v;
4767 sector_t size;
4768 struct list_head *tmp2;
4769 mdk_rdev_t *rdev;
d7603b7e 4770 struct mdstat_info *mi = seq->private;
32a7627c 4771 struct bitmap *bitmap;
1da177e4
LT		 4772
4773 if (v == (void*)1) {
2604b703 4774 struct mdk_personality *pers;
1da177e4
LT		 4775 seq_printf(seq, "Personalities : ");
4776 spin_lock(&pers_lock);
2604b703
N		 4777 list_for_each_entry(pers, &pers_list, list)
4778 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT		 4779
4780 spin_unlock(&pers_lock);
4781 seq_printf(seq, "\n");
d7603b7e 4782 mi->event = atomic_read(&md_event_count);
1da177e4
LT		 4783 return 0;
4784 }
4785 if (v == (void*)2) {
4786 status_unused(seq);
4787 return 0;
4788 }
4789
5dc5cf7d 4790 if (mddev_lock(mddev) < 0)
1da177e4 4791 return -EINTR;
5dc5cf7d 4792
1da177e4
LT		 4793 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4794 seq_printf(seq, "%s : %sactive", mdname(mddev),
4795 mddev->pers ? "" : "in");
4796 if (mddev->pers) {
f91de92e 4797 if (mddev->ro==1)
1da177e4 4798 seq_printf(seq, " (read-only)");
f91de92e
N		 4799 if (mddev->ro==2)
4800 seq_printf(seq, "(auto-read-only)");
1da177e4
LT		 4801 seq_printf(seq, " %s", mddev->pers->name);
4802 }
4803
4804 size = 0;
4805 ITERATE_RDEV(mddev,rdev,tmp2) {
4806 char b[BDEVNAME_SIZE];
4807 seq_printf(seq, " %s[%d]",
4808 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 4809 if (test_bit(WriteMostly, &rdev->flags))
4810 seq_printf(seq, "(W)");
b2d444d7 4811 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4812 seq_printf(seq, "(F)");
4813 continue;
b325a32e
N		 4814 } else if (rdev->raid_disk < 0)
4815 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 4816 size += rdev->size;
4817 }
4818
4819 if (!list_empty(&mddev->disks)) {
4820 if (mddev->pers)
4821 seq_printf(seq, "\n %llu blocks",
4822 (unsigned long long)mddev->array_size);
4823 else
4824 seq_printf(seq, "\n %llu blocks",
4825 (unsigned long long)size);
4826 }
1cd6bf19
N		 4827 if (mddev->persistent) {
4828 if (mddev->major_version != 0 ||
4829 mddev->minor_version != 90) {
4830 seq_printf(seq," super %d.%d",
4831 mddev->major_version,
4832 mddev->minor_version);
4833 }
4834 } else
4835 seq_printf(seq, " super non-persistent");
1da177e4
LT		 4836
4837 if (mddev->pers) {
4838 mddev->pers->status (seq, mddev);
4839 seq_printf(seq, "\n ");
8e1b39d6
N		 4840 if (mddev->pers->sync_request) {
4841 if (mddev->curr_resync > 2) {
4842 status_resync (seq, mddev);
4843 seq_printf(seq, "\n ");
4844 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4845 seq_printf(seq, "\tresync=DELAYED\n ");
4846 else if (mddev->recovery_cp < MaxSector)
4847 seq_printf(seq, "\tresync=PENDING\n ");
4848 }
32a7627c
N		 4849 } else
4850 seq_printf(seq, "\n ");
4851
4852 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 4853 unsigned long chunk_kb;
4854 unsigned long flags;
32a7627c
N		 4855 spin_lock_irqsave(&bitmap->lock, flags);
4856 chunk_kb = bitmap->chunksize >> 10;
4857 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
4858 "%lu%s chunk",
4859 bitmap->pages - bitmap->missing_pages,
4860 bitmap->pages,
4861 (bitmap->pages - bitmap->missing_pages)
4862 << (PAGE_SHIFT - 10),
4863 chunk_kb ? chunk_kb : bitmap->chunksize,
4864 chunk_kb ? "KB" : "B");
78d742d8
N		 4865 if (bitmap->file) {
4866 seq_printf(seq, ", file: ");
4867 seq_path(seq, bitmap->file->f_vfsmnt,
4868 bitmap->file->f_dentry," \t\n");
32a7627c 4869 }
78d742d8 4870
32a7627c
N		 4871 seq_printf(seq, "\n");
4872 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 4873 }
4874
4875 seq_printf(seq, "\n");
4876 }
4877 mddev_unlock(mddev);
4878
4879 return 0;
4880}
4881
4882static struct seq_operations md_seq_ops = {
4883 .start = md_seq_start,
4884 .next = md_seq_next,
4885 .stop = md_seq_stop,
4886 .show = md_seq_show,
4887};
4888
4889static int md_seq_open(struct inode *inode, struct file *file)
4890{
4891 int error;
d7603b7e
N		 4892 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
4893 if (mi == NULL)
4894 return -ENOMEM;
1da177e4
LT		 4895
4896 error = seq_open(file, &md_seq_ops);
d7603b7e
N		 4897 if (error)
4898 kfree(mi);
4899 else {
4900 struct seq_file *p = file->private_data;
4901 p->private = mi;
4902 mi->event = atomic_read(&md_event_count);
4903 }
1da177e4
LT		 4904 return error;
4905}
4906
d7603b7e
N		 4907static int md_seq_release(struct inode *inode, struct file *file)
4908{
4909 struct seq_file *m = file->private_data;
4910 struct mdstat_info *mi = m->private;
4911 m->private = NULL;
4912 kfree(mi);
4913 return seq_release(inode, file);
4914}
4915
4916static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
4917{
4918 struct seq_file *m = filp->private_data;
4919 struct mdstat_info *mi = m->private;
4920 int mask;
4921
4922 poll_wait(filp, &md_event_waiters, wait);
4923
4924 /* always allow read */
4925 mask = POLLIN | POLLRDNORM;
4926
4927 if (mi->event != atomic_read(&md_event_count))
4928 mask |= POLLERR | POLLPRI;
4929 return mask;
4930}
4931
1da177e4
LT		 4932static struct file_operations md_seq_fops = {
4933 .open = md_seq_open,
4934 .read = seq_read,
4935 .llseek = seq_lseek,
d7603b7e
N		 4936 .release = md_seq_release,
4937 .poll = mdstat_poll,
1da177e4
LT		 4938};
4939
2604b703 4940int register_md_personality(struct mdk_personality *p)
1da177e4 4941{
1da177e4 4942 spin_lock(&pers_lock);
2604b703
N		 4943 list_add_tail(&p->list, &pers_list);
4944 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
1da177e4
LT		 4945 spin_unlock(&pers_lock);
4946 return 0;
4947}
4948
2604b703 4949int unregister_md_personality(struct mdk_personality *p)
1da177e4 4950{
2604b703 4951 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 4952 spin_lock(&pers_lock);
2604b703 4953 list_del_init(&p->list);
1da177e4
LT		 4954 spin_unlock(&pers_lock);
4955 return 0;
4956}
4957
4958static int is_mddev_idle(mddev_t *mddev)
4959{
4960 mdk_rdev_t * rdev;
4961 struct list_head *tmp;
4962 int idle;
4963 unsigned long curr_events;
4964
4965 idle = 1;
4966 ITERATE_RDEV(mddev,rdev,tmp) {
4967 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 4968 curr_events = disk_stat_read(disk, sectors[0]) +
4969 disk_stat_read(disk, sectors[1]) -
1da177e4 4970 atomic_read(&disk->sync_io);
c0e48521
N		 4971 /* The difference between curr_events and last_events
4972 * will be affected by any new non-sync IO (making
4973 * curr_events bigger) and any difference in the amount of
4974 * in-flight syncio (making current_events bigger or smaller)
4975 * The amount in-flight is currently limited to
4976 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4977 * which is at most 4096 sectors.
4978 * These numbers are fairly fragile and should be made
4979 * more robust, probably by enforcing the
4980 * 'window size' that md_do_sync sort-of uses.
4981 *
1da177e4
LT		 4982 * Note: the following is an unsigned comparison.
4983 */
c0e48521 4984 if ((curr_events - rdev->last_events + 4096) > 8192) {
1da177e4
LT		 4985 rdev->last_events = curr_events;
4986 idle = 0;
4987 }
4988 }
4989 return idle;
4990}
4991
4992void md_done_sync(mddev_t *mddev, int blocks, int ok)
4993{
4994 /* another "blocks" (512byte) blocks have been synced */
4995 atomic_sub(blocks, &mddev->recovery_active);
4996 wake_up(&mddev->recovery_wait);
4997 if (!ok) {
4998 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4999 md_wakeup_thread(mddev->thread);
5000 // stop recovery, signal do_sync ....
5001 }
5002}
5003
5004
06d91a5f
N		 5005/* md_write_start(mddev, bi)
5006 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 5007 * in superblock) before writing, schedule a superblock update
5008 * and wait for it to complete.
06d91a5f 5009 */
3d310eb7 5010void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 5011{
06d91a5f 5012 if (bio_data_dir(bi) != WRITE)
3d310eb7 5013 return;
06d91a5f 5014
f91de92e
N		 5015 BUG_ON(mddev->ro == 1);
5016 if (mddev->ro == 2) {
5017 /* need to switch to read/write */
5018 mddev->ro = 0;
5019 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5020 md_wakeup_thread(mddev->thread);
5021 }
06d91a5f 5022 atomic_inc(&mddev->writes_pending);
06d91a5f 5023 if (mddev->in_sync) {
a9701a30 5024 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 5025 if (mddev->in_sync) {
5026 mddev->in_sync = 0;
42543769 5027 mddev->sb_dirty = 3;
3d310eb7
N		 5028 md_wakeup_thread(mddev->thread);
5029 }
a9701a30 5030 spin_unlock_irq(&mddev->write_lock);
06d91a5f 5031 }
3d310eb7 5032 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
1da177e4
LT		 5033}
5034
5035void md_write_end(mddev_t *mddev)
5036{
5037 if (atomic_dec_and_test(&mddev->writes_pending)) {
5038 if (mddev->safemode == 2)
5039 md_wakeup_thread(mddev->thread);
16f17b39 5040 else if (mddev->safemode_delay)
1da177e4
LT		 5041 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5042 }
5043}
5044
75c96f85 5045static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
1da177e4
LT		 5046
5047#define SYNC_MARKS 10
5048#define SYNC_MARK_STEP (3*HZ)
29269553 5049void md_do_sync(mddev_t *mddev)
1da177e4
LT		 5050{
5051 mddev_t *mddev2;
5052 unsigned int currspeed = 0,
5053 window;
57afd89f 5054 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 5055 unsigned long mark[SYNC_MARKS];
5056 sector_t mark_cnt[SYNC_MARKS];
5057 int last_mark,m;
5058 struct list_head *tmp;
5059 sector_t last_check;
57afd89f 5060 int skipped = 0;
5fd6c1dc
N		 5061 struct list_head *rtmp;
5062 mdk_rdev_t *rdev;
1da177e4
LT		 5063
5064 /* just incase thread restarts... */
5065 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5066 return;
5fd6c1dc
N		 5067 if (mddev->ro) /* never try to sync a read-only array */
5068 return;
1da177e4
LT		 5069
5070 /* we overload curr_resync somewhat here.
5071 * 0 == not engaged in resync at all
5072 * 2 == checking that there is no conflict with another sync
5073 * 1 == like 2, but have yielded to allow conflicting resync to
5074 * commense
5075 * other == active in resync - this many blocks
5076 *
5077 * Before starting a resync we must have set curr_resync to
5078 * 2, and then checked that every "conflicting" array has curr_resync
5079 * less than ours. When we find one that is the same or higher
5080 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5081 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5082 * This will mean we have to start checking from the beginning again.
5083 *
5084 */
5085
5086 do {
5087 mddev->curr_resync = 2;
5088
5089 try_again:
787453c2 5090 if (kthread_should_stop()) {
6985c43f 5091 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 5092 goto skip;
5093 }
5094 ITERATE_MDDEV(mddev2,tmp) {
1da177e4
LT		 5095 if (mddev2 == mddev)
5096 continue;
5097 if (mddev2->curr_resync &&
5098 match_mddev_units(mddev,mddev2)) {
5099 DEFINE_WAIT(wq);
5100 if (mddev < mddev2 && mddev->curr_resync == 2) {
5101 /* arbitrarily yield */
5102 mddev->curr_resync = 1;
5103 wake_up(&resync_wait);
5104 }
5105 if (mddev > mddev2 && mddev->curr_resync == 1)
5106 /* no need to wait here, we can wait the next
5107 * time 'round when curr_resync == 2
5108 */
5109 continue;
787453c2
N		 5110 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5111 if (!kthread_should_stop() &&
8712e553 5112 mddev2->curr_resync >= mddev->curr_resync) {
1da177e4
LT		 5113 printk(KERN_INFO "md: delaying resync of %s"
5114 " until %s has finished resync (they"
5115 " share one or more physical units)\n",
5116 mdname(mddev), mdname(mddev2));
5117 mddev_put(mddev2);
5118 schedule();
5119 finish_wait(&resync_wait, &wq);
5120 goto try_again;
5121 }
5122 finish_wait(&resync_wait, &wq);
5123 }
5124 }
5125 } while (mddev->curr_resync < 2);
5126
5fd6c1dc 5127 j = 0;
9d88883e 5128 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 5129 /* resync follows the size requested by the personality,
57afd89f 5130 * which defaults to physical size, but can be virtual size
1da177e4
LT		 5131 */
5132 max_sectors = mddev->resync_max_sectors;
9d88883e 5133 mddev->resync_mismatches = 0;
5fd6c1dc
N		 5134 /* we don't use the checkpoint if there's a bitmap */
5135 if (!mddev->bitmap &&
5136 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5137 j = mddev->recovery_cp;
ccfcc3c1
N		 5138 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5139 max_sectors = mddev->size << 1;
5fd6c1dc 5140 else {
1da177e4
LT		 5141 /* recovery follows the physical size of devices */
5142 max_sectors = mddev->size << 1;
5fd6c1dc
N		 5143 j = MaxSector;
5144 ITERATE_RDEV(mddev,rdev,rtmp)
5145 if (rdev->raid_disk >= 0 &&
5146 !test_bit(Faulty, &rdev->flags) &&
5147 !test_bit(In_sync, &rdev->flags) &&
5148 rdev->recovery_offset < j)
5149 j = rdev->recovery_offset;
5150 }
1da177e4
LT		 5151
5152 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
5153 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
88202a0c 5154 " %d KB/sec/disc.\n", speed_min(mddev));
338cec32 5155 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
1da177e4 5156 "(but not more than %d KB/sec) for reconstruction.\n",
88202a0c 5157 speed_max(mddev));
1da177e4
LT		 5158
5159 is_mddev_idle(mddev); /* this also initializes IO event counters */
5fd6c1dc 5160
57afd89f 5161 io_sectors = 0;
1da177e4
LT		 5162 for (m = 0; m < SYNC_MARKS; m++) {
5163 mark[m] = jiffies;
57afd89f 5164 mark_cnt[m] = io_sectors;
1da177e4
LT		 5165 }
5166 last_mark = 0;
5167 mddev->resync_mark = mark[last_mark];
5168 mddev->resync_mark_cnt = mark_cnt[last_mark];
5169
5170 /*
5171 * Tune reconstruction:
5172 */
5173 window = 32*(PAGE_SIZE/512);
5174 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5175 window/2,(unsigned long long) max_sectors/2);
5176
5177 atomic_set(&mddev->recovery_active, 0);
5178 init_waitqueue_head(&mddev->recovery_wait);
5179 last_check = 0;
5180
5181 if (j>2) {
5182 printk(KERN_INFO
5183 "md: resuming recovery of %s from checkpoint.\n",
5184 mdname(mddev));
5185 mddev->curr_resync = j;
5186 }
5187
5188 while (j < max_sectors) {
57afd89f 5189 sector_t sectors;
1da177e4 5190
57afd89f
N		 5191 skipped = 0;
5192 sectors = mddev->pers->sync_request(mddev, j, &skipped,
88202a0c 5193 currspeed < speed_min(mddev));
57afd89f 5194 if (sectors == 0) {
1da177e4
LT		 5195 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5196 goto out;
5197 }
57afd89f
N		 5198
5199 if (!skipped) { /* actual IO requested */
5200 io_sectors += sectors;
5201 atomic_add(sectors, &mddev->recovery_active);
5202 }
5203
1da177e4
LT		 5204 j += sectors;
5205 if (j>1) mddev->curr_resync = j;
d7603b7e
N		 5206 if (last_check == 0)
5207 /* this is the earliers that rebuilt will be
5208 * visible in /proc/mdstat
5209 */
5210 md_new_event(mddev);
57afd89f
N		 5211
5212 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 5213 continue;
5214
57afd89f 5215 last_check = io_sectors;
1da177e4
LT		 5216
5217 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
5218 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
5219 break;
5220
5221 repeat:
5222 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5223 /* step marks */
5224 int next = (last_mark+1) % SYNC_MARKS;
5225
5226 mddev->resync_mark = mark[next];
5227 mddev->resync_mark_cnt = mark_cnt[next];
5228 mark[next] = jiffies;
57afd89f 5229 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 5230 last_mark = next;
5231 }
5232
5233
787453c2 5234 if (kthread_should_stop()) {
1da177e4
LT		 5235 /*
5236 * got a signal, exit.
5237 */
5238 printk(KERN_INFO
5239 "md: md_do_sync() got signal ... exiting\n");
1da177e4
LT		 5240 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5241 goto out;
5242 }
5243
5244 /*
5245 * this loop exits only if either when we are slower than
5246 * the 'hard' speed limit, or the system was IO-idle for
5247 * a jiffy.
5248 * the system might be non-idle CPU-wise, but we only care
5249 * about not overloading the IO subsystem. (things like an
5250 * e2fsck being done on the RAID array should execute fast)
5251 */
5252 mddev->queue->unplug_fn(mddev->queue);
5253 cond_resched();
5254
57afd89f
N		 5255 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5256 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4 5257
88202a0c
N		 5258 if (currspeed > speed_min(mddev)) {
5259 if ((currspeed > speed_max(mddev)) ||
1da177e4 5260 !is_mddev_idle(mddev)) {
c0e48521 5261 msleep(500);
1da177e4
LT		 5262 goto repeat;
5263 }
5264 }
5265 }
5266 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
5267 /*
5268 * this also signals 'finished resyncing' to md_stop
5269 */
5270 out:
5271 mddev->queue->unplug_fn(mddev->queue);
5272
5273 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5274
5275 /* tell personality that we are finished */
57afd89f 5276 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 5277
5278 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
ccfcc3c1
N		 5279 test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
5280 !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5fd6c1dc
N		 5281 mddev->curr_resync > 2) {
5282 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5283 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5284 if (mddev->curr_resync >= mddev->recovery_cp) {
5285 printk(KERN_INFO
5286 "md: checkpointing recovery of %s.\n",
5287 mdname(mddev));
5288 mddev->recovery_cp = mddev->curr_resync;
5289 }
5290 } else
5291 mddev->recovery_cp = MaxSector;
5292 } else {
5293 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5294 mddev->curr_resync = MaxSector;
5295 ITERATE_RDEV(mddev,rdev,rtmp)
5296 if (rdev->raid_disk >= 0 &&
5297 !test_bit(Faulty, &rdev->flags) &&
5298 !test_bit(In_sync, &rdev->flags) &&
5299 rdev->recovery_offset < mddev->curr_resync)
5300 rdev->recovery_offset = mddev->curr_resync;
5301 mddev->sb_dirty = 1;
5302 }
1da177e4
LT		 5303 }
5304
1da177e4
LT		 5305 skip:
5306 mddev->curr_resync = 0;
5307 wake_up(&resync_wait);
5308 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5309 md_wakeup_thread(mddev->thread);
5310}
29269553 5311EXPORT_SYMBOL_GPL(md_do_sync);
1da177e4
LT		 5312
5313
5314/*
5315 * This routine is regularly called by all per-raid-array threads to
5316 * deal with generic issues like resync and super-block update.
5317 * Raid personalities that don't have a thread (linear/raid0) do not
5318 * need this as they never do any recovery or update the superblock.
5319 *
5320 * It does not do any resync itself, but rather "forks" off other threads
5321 * to do that as needed.
5322 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5323 * "->recovery" and create a thread at ->sync_thread.
5324 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5325 * and wakeups up this thread which will reap the thread and finish up.
5326 * This thread also removes any faulty devices (with nr_pending == 0).
5327 *
5328 * The overall approach is:
5329 * 1/ if the superblock needs updating, update it.
5330 * 2/ If a recovery thread is running, don't do anything else.
5331 * 3/ If recovery has finished, clean up, possibly marking spares active.
5332 * 4/ If there are any faulty devices, remove them.
5333 * 5/ If array is degraded, try to add spares devices
5334 * 6/ If array has spares or is not in-sync, start a resync thread.
5335 */
5336void md_check_recovery(mddev_t *mddev)
5337{
5338 mdk_rdev_t *rdev;
5339 struct list_head *rtmp;
5340
5341
5f40402d
N		 5342 if (mddev->bitmap)
5343 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 5344
5345 if (mddev->ro)
5346 return;
fca4d848
N		 5347
5348 if (signal_pending(current)) {
5349 if (mddev->pers->sync_request) {
5350 printk(KERN_INFO "md: %s in immediate safe mode\n",
5351 mdname(mddev));
5352 mddev->safemode = 2;
5353 }
5354 flush_signals(current);
5355 }
5356
1da177e4
LT		 5357 if ( ! (
5358 mddev->sb_dirty ||
5359 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848
N		 5360 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
5361 (mddev->safemode == 1) ||
5362 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5363 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 5364 ))
5365 return;
fca4d848 5366
df5b89b3 5367 if (mddev_trylock(mddev)) {
1da177e4 5368 int spares =0;
fca4d848 5369
a9701a30 5370 spin_lock_irq(&mddev->write_lock);
fca4d848
N		 5371 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
5372 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
5373 mddev->in_sync = 1;
42543769 5374 mddev->sb_dirty = 3;
fca4d848
N		 5375 }
5376 if (mddev->safemode == 1)
5377 mddev->safemode = 0;
a9701a30 5378 spin_unlock_irq(&mddev->write_lock);
fca4d848 5379
1da177e4
LT		 5380 if (mddev->sb_dirty)
5381 md_update_sb(mddev);
06d91a5f 5382
06d91a5f 5383
1da177e4
LT		 5384 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
5385 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
5386 /* resync/recovery still happening */
5387 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5388 goto unlock;
5389 }
5390 if (mddev->sync_thread) {
5391 /* resync has finished, collect result */
5392 md_unregister_thread(mddev->sync_thread);
5393 mddev->sync_thread = NULL;
5394 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5395 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5396 /* success...*/
5397 /* activate any spares */
5398 mddev->pers->spare_active(mddev);
5399 }
5400 md_update_sb(mddev);
41158c7e
N		 5401
5402 /* if array is no-longer degraded, then any saved_raid_disk
5403 * information must be scrapped
5404 */
5405 if (!mddev->degraded)
5406 ITERATE_RDEV(mddev,rdev,rtmp)
5407 rdev->saved_raid_disk = -1;
5408
1da177e4
LT		 5409 mddev->recovery = 0;
5410 /* flag recovery needed just to double check */
5411 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
d7603b7e 5412 md_new_event(mddev);
1da177e4
LT		 5413 goto unlock;
5414 }
24dd469d
N		 5415 /* Clear some bits that don't mean anything, but
5416 * might be left set
5417 */
5418 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5419 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
5420 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
5421 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4 5422
5fd6c1dc
N		 5423 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5424 goto unlock;
1da177e4
LT		 5425 /* no recovery is running.
5426 * remove any failed drives, then
5427 * add spares if possible.
5428 * Spare are also removed and re-added, to allow
5429 * the personality to fail the re-add.
5430 */
5431 ITERATE_RDEV(mddev,rdev,rtmp)
5432 if (rdev->raid_disk >= 0 &&
b2d444d7 5433 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
1da177e4 5434 atomic_read(&rdev->nr_pending)==0) {
86e6ffdd
N		 5435 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
5436 char nm[20];
5437 sprintf(nm,"rd%d", rdev->raid_disk);
5438 sysfs_remove_link(&mddev->kobj, nm);
1da177e4 5439 rdev->raid_disk = -1;
86e6ffdd 5440 }
1da177e4
LT		 5441 }
5442
5443 if (mddev->degraded) {
5444 ITERATE_RDEV(mddev,rdev,rtmp)
5445 if (rdev->raid_disk < 0
b2d444d7 5446 && !test_bit(Faulty, &rdev->flags)) {
5fd6c1dc 5447 rdev->recovery_offset = 0;
86e6ffdd
N		 5448 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5449 char nm[20];
5450 sprintf(nm, "rd%d", rdev->raid_disk);
5451 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
1da177e4 5452 spares++;
d7603b7e 5453 md_new_event(mddev);
86e6ffdd 5454 } else
1da177e4
LT		 5455 break;
5456 }
5457 }
5458
24dd469d
N		 5459 if (spares) {
5460 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5461 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5462 } else if (mddev->recovery_cp < MaxSector) {
5463 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5464 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5465 /* nothing to be done ... */
1da177e4 5466 goto unlock;
24dd469d 5467
1da177e4
LT		 5468 if (mddev->pers->sync_request) {
5469 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 5470 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
5471 /* We are adding a device or devices to an array
5472 * which has the bitmap stored on all devices.
5473 * So make sure all bitmap pages get written
5474 */
5475 bitmap_write_all(mddev->bitmap);
5476 }
1da177e4
LT		 5477 mddev->sync_thread = md_register_thread(md_do_sync,
5478 mddev,
5479 "%s_resync");
5480 if (!mddev->sync_thread) {
5481 printk(KERN_ERR "%s: could not start resync"
5482 " thread...\n",
5483 mdname(mddev));
5484 /* leave the spares where they are, it shouldn't hurt */
5485 mddev->recovery = 0;
d7603b7e 5486 } else
1da177e4 5487 md_wakeup_thread(mddev->sync_thread);
d7603b7e 5488 md_new_event(mddev);
1da177e4
LT		 5489 }
5490 unlock:
5491 mddev_unlock(mddev);
5492 }
5493}
5494
75c96f85
AB		 5495static int md_notify_reboot(struct notifier_block *this,
5496 unsigned long code, void *x)
1da177e4
LT		 5497{
5498 struct list_head *tmp;
5499 mddev_t *mddev;
5500
5501 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
5502
5503 printk(KERN_INFO "md: stopping all md devices.\n");
5504
5505 ITERATE_MDDEV(mddev,tmp)
c71d4887 5506 if (mddev_trylock(mddev)) {
1da177e4 5507 do_md_stop (mddev, 1);
c71d4887
NB		 5508 mddev_unlock(mddev);
5509 }
1da177e4
LT		 5510 /*
5511 * certain more exotic SCSI devices are known to be
5512 * volatile wrt too early system reboots. While the
5513 * right place to handle this issue is the given
5514 * driver, we do want to have a safe RAID driver ...
5515 */
5516 mdelay(1000*1);
5517 }
5518 return NOTIFY_DONE;
5519}
5520
75c96f85 5521static struct notifier_block md_notifier = {
1da177e4
LT		 5522 .notifier_call = md_notify_reboot,
5523 .next = NULL,
5524 .priority = INT_MAX, /* before any real devices */
5525};
5526
5527static void md_geninit(void)
5528{
5529 struct proc_dir_entry *p;
5530
5531 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5532
5533 p = create_proc_entry("mdstat", S_IRUGO, NULL);
5534 if (p)
5535 p->proc_fops = &md_seq_fops;
5536}
5537
75c96f85 5538static int __init md_init(void)
1da177e4 5539{
1da177e4
LT		 5540 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
5541 " MD_SB_DISKS=%d\n",
5542 MD_MAJOR_VERSION, MD_MINOR_VERSION,
5543 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
bd926c63 5544 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
32a7627c 5545 BITMAP_MINOR);
1da177e4
LT		 5546
5547 if (register_blkdev(MAJOR_NR, "md"))
5548 return -1;
5549 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
5550 unregister_blkdev(MAJOR_NR, "md");
5551 return -1;
5552 }
1da177e4
LT		 5553 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
5554 md_probe, NULL, NULL);
5555 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
5556 md_probe, NULL, NULL);
5557
1da177e4
LT		 5558 register_reboot_notifier(&md_notifier);
5559 raid_table_header = register_sysctl_table(raid_root_table, 1);
5560
5561 md_geninit();
5562 return (0);
5563}
5564
5565
5566#ifndef MODULE
5567
5568/*
5569 * Searches all registered partitions for autorun RAID arrays
5570 * at boot time.
5571 */
5572static dev_t detected_devices[128];
5573static int dev_cnt;
5574
5575void md_autodetect_dev(dev_t dev)
5576{
5577 if (dev_cnt >= 0 && dev_cnt < 127)
5578 detected_devices[dev_cnt++] = dev;
5579}
5580
5581
5582static void autostart_arrays(int part)
5583{
5584 mdk_rdev_t *rdev;
5585 int i;
5586
5587 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
5588
5589 for (i = 0; i < dev_cnt; i++) {
5590 dev_t dev = detected_devices[i];
5591
5592 rdev = md_import_device(dev,0, 0);
5593 if (IS_ERR(rdev))
5594 continue;
5595
b2d444d7 5596 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 5597 MD_BUG();
5598 continue;
5599 }
5600 list_add(&rdev->same_set, &pending_raid_disks);
5601 }
5602 dev_cnt = 0;
5603
5604 autorun_devices(part);
5605}
5606
5607#endif
5608
5609static __exit void md_exit(void)
5610{
5611 mddev_t *mddev;
5612 struct list_head *tmp;
8ab5e4c1 5613
1da177e4
LT		 5614 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
5615 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
1da177e4
LT		 5616
5617 unregister_blkdev(MAJOR_NR,"md");
5618 unregister_blkdev(mdp_major, "mdp");
5619 unregister_reboot_notifier(&md_notifier);
5620 unregister_sysctl_table(raid_table_header);
5621 remove_proc_entry("mdstat", NULL);
5622 ITERATE_MDDEV(mddev,tmp) {
5623 struct gendisk *disk = mddev->gendisk;
5624 if (!disk)
5625 continue;
5626 export_array(mddev);
5627 del_gendisk(disk);
5628 put_disk(disk);
5629 mddev->gendisk = NULL;
5630 mddev_put(mddev);
5631 }
5632}
5633
5634module_init(md_init)
5635module_exit(md_exit)
5636
f91de92e
N		 5637static int get_ro(char *buffer, struct kernel_param *kp)
5638{
5639 return sprintf(buffer, "%d", start_readonly);
5640}
5641static int set_ro(const char *val, struct kernel_param *kp)
5642{
5643 char *e;
5644 int num = simple_strtoul(val, &e, 10);
5645 if (*val && (*e == '\0' || *e == '\n')) {
5646 start_readonly = num;
4dbcdc75 5647 return 0;
f91de92e
N		 5648 }
5649 return -EINVAL;
5650}
5651
5652module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
6ff8d8ec
N		 5653module_param(start_dirty_degraded, int, 0644);
5654
f91de92e 5655
1da177e4
LT		 5656EXPORT_SYMBOL(register_md_personality);
5657EXPORT_SYMBOL(unregister_md_personality);
5658EXPORT_SYMBOL(md_error);
5659EXPORT_SYMBOL(md_done_sync);
5660EXPORT_SYMBOL(md_write_start);
5661EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 5662EXPORT_SYMBOL(md_register_thread);
5663EXPORT_SYMBOL(md_unregister_thread);
5664EXPORT_SYMBOL(md_wakeup_thread);
1da177e4
LT		 5665EXPORT_SYMBOL(md_check_recovery);
5666MODULE_LICENSE("GPL");
aa1595e9 5667MODULE_ALIAS("md");
72008652 5668MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
kernel source for telekom puls (alcatel/mediatek)