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