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[PATCH] sgiioc4: use mmio ops instead of port io
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / md / md.c
CommitLineData
1da177e4
LT		 1/*
2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
4
5 completely rewritten, based on the MD driver code from Marc Zyngier
6
7 Changes:
8
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
16
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
19
20 Neil Brown <neilb@cse.unsw.edu.au>.
21
32a7627c
N		 22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
24
1da177e4
LT		 25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
28 any later version.
29
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
33*/
34
35#include <linux/module.h>
36#include <linux/config.h>
a6fb0934 37#include <linux/kthread.h>
1da177e4
LT		 38#include <linux/linkage.h>
39#include <linux/raid/md.h>
32a7627c 40#include <linux/raid/bitmap.h>
1da177e4
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
1da177e4
LT		 282static inline int mddev_trylock(mddev_t * mddev)
283{
df5b89b3 284 return mutex_trylock(&mddev->reconfig_mutex);
1da177e4
LT		 285}
286
287static inline void mddev_unlock(mddev_t * mddev)
288{
df5b89b3 289 mutex_unlock(&mddev->reconfig_mutex);
1da177e4 290
005eca5e 291 md_wakeup_thread(mddev->thread);
1da177e4
LT		 292}
293
2989ddbd 294static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
1da177e4
LT		 295{
296 mdk_rdev_t * rdev;
297 struct list_head *tmp;
298
299 ITERATE_RDEV(mddev,rdev,tmp) {
300 if (rdev->desc_nr == nr)
301 return rdev;
302 }
303 return NULL;
304}
305
306static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
307{
308 struct list_head *tmp;
309 mdk_rdev_t *rdev;
310
311 ITERATE_RDEV(mddev,rdev,tmp) {
312 if (rdev->bdev->bd_dev == dev)
313 return rdev;
314 }
315 return NULL;
316}
317
d9d166c2 318static struct mdk_personality *find_pers(int level, char *clevel)
2604b703
N		 319{
320 struct mdk_personality *pers;
d9d166c2
N		 321 list_for_each_entry(pers, &pers_list, list) {
322 if (level != LEVEL_NONE && pers->level == level)
2604b703 323 return pers;
d9d166c2
N		 324 if (strcmp(pers->name, clevel)==0)
325 return pers;
326 }
2604b703
N		 327 return NULL;
328}
329
77933d72 330static inline sector_t calc_dev_sboffset(struct block_device *bdev)
1da177e4
LT		 331{
332 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
333 return MD_NEW_SIZE_BLOCKS(size);
334}
335
336static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
337{
338 sector_t size;
339
340 size = rdev->sb_offset;
341
342 if (chunk_size)
343 size &= ~((sector_t)chunk_size/1024 - 1);
344 return size;
345}
346
347static int alloc_disk_sb(mdk_rdev_t * rdev)
348{
349 if (rdev->sb_page)
350 MD_BUG();
351
352 rdev->sb_page = alloc_page(GFP_KERNEL);
353 if (!rdev->sb_page) {
354 printk(KERN_ALERT "md: out of memory.\n");
355 return -EINVAL;
356 }
357
358 return 0;
359}
360
361static void free_disk_sb(mdk_rdev_t * rdev)
362{
363 if (rdev->sb_page) {
2d1f3b5d 364 put_page(rdev->sb_page);
1da177e4
LT		 365 rdev->sb_loaded = 0;
366 rdev->sb_page = NULL;
367 rdev->sb_offset = 0;
368 rdev->size = 0;
369 }
370}
371
372
7bfa19f2
N		 373static int super_written(struct bio *bio, unsigned int bytes_done, int error)
374{
375 mdk_rdev_t *rdev = bio->bi_private;
a9701a30 376 mddev_t *mddev = rdev->mddev;
7bfa19f2
N		 377 if (bio->bi_size)
378 return 1;
379
380 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags))
a9701a30 381 md_error(mddev, rdev);
7bfa19f2 382
a9701a30
N		 383 if (atomic_dec_and_test(&mddev->pending_writes))
384 wake_up(&mddev->sb_wait);
f8b58edf 385 bio_put(bio);
7bfa19f2
N		 386 return 0;
387}
388
a9701a30
N		 389static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
390{
391 struct bio *bio2 = bio->bi_private;
392 mdk_rdev_t *rdev = bio2->bi_private;
393 mddev_t *mddev = rdev->mddev;
394 if (bio->bi_size)
395 return 1;
396
397 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
398 error == -EOPNOTSUPP) {
399 unsigned long flags;
400 /* barriers don't appear to be supported :-( */
401 set_bit(BarriersNotsupp, &rdev->flags);
402 mddev->barriers_work = 0;
403 spin_lock_irqsave(&mddev->write_lock, flags);
404 bio2->bi_next = mddev->biolist;
405 mddev->biolist = bio2;
406 spin_unlock_irqrestore(&mddev->write_lock, flags);
407 wake_up(&mddev->sb_wait);
408 bio_put(bio);
409 return 0;
410 }
411 bio_put(bio2);
412 bio->bi_private = rdev;
413 return super_written(bio, bytes_done, error);
414}
415
7bfa19f2
N		 416void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
417 sector_t sector, int size, struct page *page)
418{
419 /* write first size bytes of page to sector of rdev
420 * Increment mddev->pending_writes before returning
421 * and decrement it on completion, waking up sb_wait
422 * if zero is reached.
423 * If an error occurred, call md_error
a9701a30
N		 424 *
425 * As we might need to resubmit the request if BIO_RW_BARRIER
426 * causes ENOTSUPP, we allocate a spare bio...
7bfa19f2
N		 427 */
428 struct bio *bio = bio_alloc(GFP_NOIO, 1);
a9701a30 429 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
7bfa19f2
N		 430
431 bio->bi_bdev = rdev->bdev;
432 bio->bi_sector = sector;
433 bio_add_page(bio, page, size, 0);
434 bio->bi_private = rdev;
435 bio->bi_end_io = super_written;
a9701a30
N		 436 bio->bi_rw = rw;
437
7bfa19f2 438 atomic_inc(&mddev->pending_writes);
a9701a30
N		 439 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
440 struct bio *rbio;
441 rw |= (1<<BIO_RW_BARRIER);
442 rbio = bio_clone(bio, GFP_NOIO);
443 rbio->bi_private = bio;
444 rbio->bi_end_io = super_written_barrier;
445 submit_bio(rw, rbio);
446 } else
447 submit_bio(rw, bio);
448}
449
450void md_super_wait(mddev_t *mddev)
451{
452 /* wait for all superblock writes that were scheduled to complete.
453 * if any had to be retried (due to BARRIER problems), retry them
454 */
455 DEFINE_WAIT(wq);
456 for(;;) {
457 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
458 if (atomic_read(&mddev->pending_writes)==0)
459 break;
460 while (mddev->biolist) {
461 struct bio *bio;
462 spin_lock_irq(&mddev->write_lock);
463 bio = mddev->biolist;
464 mddev->biolist = bio->bi_next ;
465 bio->bi_next = NULL;
466 spin_unlock_irq(&mddev->write_lock);
467 submit_bio(bio->bi_rw, bio);
468 }
469 schedule();
470 }
471 finish_wait(&mddev->sb_wait, &wq);
7bfa19f2
N		 472}
473
1da177e4
LT		 474static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
475{
476 if (bio->bi_size)
477 return 1;
478
479 complete((struct completion*)bio->bi_private);
480 return 0;
481}
482
a654b9d8 483int sync_page_io(struct block_device *bdev, sector_t sector, int size,
1da177e4
LT		 484 struct page *page, int rw)
485{
baaa2c51 486 struct bio *bio = bio_alloc(GFP_NOIO, 1);
1da177e4
LT		 487 struct completion event;
488 int ret;
489
490 rw |= (1 << BIO_RW_SYNC);
491
492 bio->bi_bdev = bdev;
493 bio->bi_sector = sector;
494 bio_add_page(bio, page, size, 0);
495 init_completion(&event);
496 bio->bi_private = &event;
497 bio->bi_end_io = bi_complete;
498 submit_bio(rw, bio);
499 wait_for_completion(&event);
500
501 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
502 bio_put(bio);
503 return ret;
504}
a8745db2 505EXPORT_SYMBOL_GPL(sync_page_io);
1da177e4 506
0002b271 507static int read_disk_sb(mdk_rdev_t * rdev, int size)
1da177e4
LT		 508{
509 char b[BDEVNAME_SIZE];
510 if (!rdev->sb_page) {
511 MD_BUG();
512 return -EINVAL;
513 }
514 if (rdev->sb_loaded)
515 return 0;
516
517
0002b271 518 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
1da177e4
LT		 519 goto fail;
520 rdev->sb_loaded = 1;
521 return 0;
522
523fail:
524 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
525 bdevname(rdev->bdev,b));
526 return -EINVAL;
527}
528
529static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
530{
531 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
532 (sb1->set_uuid1 == sb2->set_uuid1) &&
533 (sb1->set_uuid2 == sb2->set_uuid2) &&
534 (sb1->set_uuid3 == sb2->set_uuid3))
535
536 return 1;
537
538 return 0;
539}
540
541
542static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
543{
544 int ret;
545 mdp_super_t *tmp1, *tmp2;
546
547 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
548 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
549
550 if (!tmp1 || !tmp2) {
551 ret = 0;
552 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
553 goto abort;
554 }
555
556 *tmp1 = *sb1;
557 *tmp2 = *sb2;
558
559 /*
560 * nr_disks is not constant
561 */
562 tmp1->nr_disks = 0;
563 tmp2->nr_disks = 0;
564
565 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
566 ret = 0;
567 else
568 ret = 1;
569
570abort:
990a8baf
JJ		 571 kfree(tmp1);
572 kfree(tmp2);
1da177e4
LT		 573 return ret;
574}
575
576static unsigned int calc_sb_csum(mdp_super_t * sb)
577{
578 unsigned int disk_csum, csum;
579
580 disk_csum = sb->sb_csum;
581 sb->sb_csum = 0;
582 csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
583 sb->sb_csum = disk_csum;
584 return csum;
585}
586
587
588/*
589 * Handle superblock details.
590 * We want to be able to handle multiple superblock formats
591 * so we have a common interface to them all, and an array of
592 * different handlers.
593 * We rely on user-space to write the initial superblock, and support
594 * reading and updating of superblocks.
595 * Interface methods are:
596 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
597 * loads and validates a superblock on dev.
598 * if refdev != NULL, compare superblocks on both devices
599 * Return:
600 * 0 - dev has a superblock that is compatible with refdev
601 * 1 - dev has a superblock that is compatible and newer than refdev
602 * so dev should be used as the refdev in future
603 * -EINVAL superblock incompatible or invalid
604 * -othererror e.g. -EIO
605 *
606 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
607 * Verify that dev is acceptable into mddev.
608 * The first time, mddev->raid_disks will be 0, and data from
609 * dev should be merged in. Subsequent calls check that dev
610 * is new enough. Return 0 or -EINVAL
611 *
612 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
613 * Update the superblock for rdev with data in mddev
614 * This does not write to disc.
615 *
616 */
617
618struct super_type {
619 char *name;
620 struct module *owner;
621 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
622 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
623 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
624};
625
626/*
627 * load_super for 0.90.0
628 */
629static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
630{
631 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
632 mdp_super_t *sb;
633 int ret;
634 sector_t sb_offset;
635
636 /*
637 * Calculate the position of the superblock,
638 * it's at the end of the disk.
639 *
640 * It also happens to be a multiple of 4Kb.
641 */
642 sb_offset = calc_dev_sboffset(rdev->bdev);
643 rdev->sb_offset = sb_offset;
644
0002b271 645 ret = read_disk_sb(rdev, MD_SB_BYTES);
1da177e4
LT		 646 if (ret) return ret;
647
648 ret = -EINVAL;
649
650 bdevname(rdev->bdev, b);
651 sb = (mdp_super_t*)page_address(rdev->sb_page);
652
653 if (sb->md_magic != MD_SB_MAGIC) {
654 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
655 b);
656 goto abort;
657 }
658
659 if (sb->major_version != 0 ||
f6705578
N		 660 sb->minor_version < 90 ||
661 sb->minor_version > 91) {
1da177e4
LT		 662 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
663 sb->major_version, sb->minor_version,
664 b);
665 goto abort;
666 }
667
668 if (sb->raid_disks <= 0)
669 goto abort;
670
671 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
672 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
673 b);
674 goto abort;
675 }
676
677 rdev->preferred_minor = sb->md_minor;
678 rdev->data_offset = 0;
0002b271 679 rdev->sb_size = MD_SB_BYTES;
1da177e4
LT		 680
681 if (sb->level == LEVEL_MULTIPATH)
682 rdev->desc_nr = -1;
683 else
684 rdev->desc_nr = sb->this_disk.number;
685
686 if (refdev == 0)
687 ret = 1;
688 else {
689 __u64 ev1, ev2;
690 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
691 if (!uuid_equal(refsb, sb)) {
692 printk(KERN_WARNING "md: %s has different UUID to %s\n",
693 b, bdevname(refdev->bdev,b2));
694 goto abort;
695 }
696 if (!sb_equal(refsb, sb)) {
697 printk(KERN_WARNING "md: %s has same UUID"
698 " but different superblock to %s\n",
699 b, bdevname(refdev->bdev, b2));
700 goto abort;
701 }
702 ev1 = md_event(sb);
703 ev2 = md_event(refsb);
704 if (ev1 > ev2)
705 ret = 1;
706 else
707 ret = 0;
708 }
709 rdev->size = calc_dev_size(rdev, sb->chunk_size);
710
2bf071bf
N		 711 if (rdev->size < sb->size && sb->level > 1)
712 /* "this cannot possibly happen" ... */
713 ret = -EINVAL;
714
1da177e4
LT		 715 abort:
716 return ret;
717}
718
719/*
720 * validate_super for 0.90.0
721 */
722static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
723{
724 mdp_disk_t *desc;
725 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
726
41158c7e 727 rdev->raid_disk = -1;
b2d444d7 728 rdev->flags = 0;
1da177e4
LT		 729 if (mddev->raid_disks == 0) {
730 mddev->major_version = 0;
731 mddev->minor_version = sb->minor_version;
732 mddev->patch_version = sb->patch_version;
733 mddev->persistent = ! sb->not_persistent;
734 mddev->chunk_size = sb->chunk_size;
735 mddev->ctime = sb->ctime;
736 mddev->utime = sb->utime;
737 mddev->level = sb->level;
d9d166c2 738 mddev->clevel[0] = 0;
1da177e4
LT		 739 mddev->layout = sb->layout;
740 mddev->raid_disks = sb->raid_disks;
741 mddev->size = sb->size;
742 mddev->events = md_event(sb);
9223214e 743 mddev->bitmap_offset = 0;
36fa3063 744 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
1da177e4 745
f6705578
N		 746 if (mddev->minor_version >= 91) {
747 mddev->reshape_position = sb->reshape_position;
748 mddev->delta_disks = sb->delta_disks;
749 mddev->new_level = sb->new_level;
750 mddev->new_layout = sb->new_layout;
751 mddev->new_chunk = sb->new_chunk;
752 } else {
753 mddev->reshape_position = MaxSector;
754 mddev->delta_disks = 0;
755 mddev->new_level = mddev->level;
756 mddev->new_layout = mddev->layout;
757 mddev->new_chunk = mddev->chunk_size;
758 }
759
1da177e4
LT		 760 if (sb->state & (1<<MD_SB_CLEAN))
761 mddev->recovery_cp = MaxSector;
762 else {
763 if (sb->events_hi == sb->cp_events_hi &&
764 sb->events_lo == sb->cp_events_lo) {
765 mddev->recovery_cp = sb->recovery_cp;
766 } else
767 mddev->recovery_cp = 0;
768 }
769
770 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
771 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
772 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
773 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
774
775 mddev->max_disks = MD_SB_DISKS;
a654b9d8
N		 776
777 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
778 mddev->bitmap_file == NULL) {
c5a10f62
N		 779 if (mddev->level != 1 && mddev->level != 4
780 && mddev->level != 5 && mddev->level != 6
6cce3b23 781 && mddev->level != 10) {
a654b9d8 782 /* FIXME use a better test */
6cce3b23 783 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
a654b9d8
N		 784 return -EINVAL;
785 }
36fa3063 786 mddev->bitmap_offset = mddev->default_bitmap_offset;
a654b9d8
N		 787 }
788
41158c7e
N		 789 } else if (mddev->pers == NULL) {
790 /* Insist on good event counter while assembling */
791 __u64 ev1 = md_event(sb);
1da177e4
LT		 792 ++ev1;
793 if (ev1 < mddev->events)
794 return -EINVAL;
41158c7e
N		 795 } else if (mddev->bitmap) {
796 /* if adding to array with a bitmap, then we can accept an
797 * older device ... but not too old.
798 */
799 __u64 ev1 = md_event(sb);
800 if (ev1 < mddev->bitmap->events_cleared)
801 return 0;
802 } else /* just a hot-add of a new device, leave raid_disk at -1 */
803 return 0;
804
1da177e4 805 if (mddev->level != LEVEL_MULTIPATH) {
1da177e4
LT		 806 desc = sb->disks + rdev->desc_nr;
807
808 if (desc->state & (1<<MD_DISK_FAULTY))
b2d444d7 809 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 810 else if (desc->state & (1<<MD_DISK_SYNC) &&
811 desc->raid_disk < mddev->raid_disks) {
b2d444d7 812 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 813 rdev->raid_disk = desc->raid_disk;
814 }
8ddf9efe
N		 815 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
816 set_bit(WriteMostly, &rdev->flags);
41158c7e 817 } else /* MULTIPATH are always insync */
b2d444d7 818 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 819 return 0;
820}
821
822/*
823 * sync_super for 0.90.0
824 */
825static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
826{
827 mdp_super_t *sb;
828 struct list_head *tmp;
829 mdk_rdev_t *rdev2;
830 int next_spare = mddev->raid_disks;
19133a42 831
1da177e4
LT		 832
833 /* make rdev->sb match mddev data..
834 *
835 * 1/ zero out disks
836 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
837 * 3/ any empty disks < next_spare become removed
838 *
839 * disks[0] gets initialised to REMOVED because
840 * we cannot be sure from other fields if it has
841 * been initialised or not.
842 */
843 int i;
844 int active=0, working=0,failed=0,spare=0,nr_disks=0;
845
61181565
N		 846 rdev->sb_size = MD_SB_BYTES;
847
1da177e4
LT		 848 sb = (mdp_super_t*)page_address(rdev->sb_page);
849
850 memset(sb, 0, sizeof(*sb));
851
852 sb->md_magic = MD_SB_MAGIC;
853 sb->major_version = mddev->major_version;
1da177e4
LT		 854 sb->patch_version = mddev->patch_version;
855 sb->gvalid_words = 0; /* ignored */
856 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
857 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
858 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
859 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
860
861 sb->ctime = mddev->ctime;
862 sb->level = mddev->level;
863 sb->size = mddev->size;
864 sb->raid_disks = mddev->raid_disks;
865 sb->md_minor = mddev->md_minor;
866 sb->not_persistent = !mddev->persistent;
867 sb->utime = mddev->utime;
868 sb->state = 0;
869 sb->events_hi = (mddev->events>>32);
870 sb->events_lo = (u32)mddev->events;
871
f6705578
N		 872 if (mddev->reshape_position == MaxSector)
873 sb->minor_version = 90;
874 else {
875 sb->minor_version = 91;
876 sb->reshape_position = mddev->reshape_position;
877 sb->new_level = mddev->new_level;
878 sb->delta_disks = mddev->delta_disks;
879 sb->new_layout = mddev->new_layout;
880 sb->new_chunk = mddev->new_chunk;
881 }
882 mddev->minor_version = sb->minor_version;
1da177e4
LT		 883 if (mddev->in_sync)
884 {
885 sb->recovery_cp = mddev->recovery_cp;
886 sb->cp_events_hi = (mddev->events>>32);
887 sb->cp_events_lo = (u32)mddev->events;
888 if (mddev->recovery_cp == MaxSector)
889 sb->state = (1<< MD_SB_CLEAN);
890 } else
891 sb->recovery_cp = 0;
892
893 sb->layout = mddev->layout;
894 sb->chunk_size = mddev->chunk_size;
895
a654b9d8
N		 896 if (mddev->bitmap && mddev->bitmap_file == NULL)
897 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
898
1da177e4
LT		 899 sb->disks[0].state = (1<<MD_DISK_REMOVED);
900 ITERATE_RDEV(mddev,rdev2,tmp) {
901 mdp_disk_t *d;
86e6ffdd 902 int desc_nr;
b2d444d7
N		 903 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
904 && !test_bit(Faulty, &rdev2->flags))
86e6ffdd 905 desc_nr = rdev2->raid_disk;
1da177e4 906 else
86e6ffdd 907 desc_nr = next_spare++;
19133a42 908 rdev2->desc_nr = desc_nr;
1da177e4
LT		 909 d = &sb->disks[rdev2->desc_nr];
910 nr_disks++;
911 d->number = rdev2->desc_nr;
912 d->major = MAJOR(rdev2->bdev->bd_dev);
913 d->minor = MINOR(rdev2->bdev->bd_dev);
b2d444d7
N		 914 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
915 && !test_bit(Faulty, &rdev2->flags))
1da177e4
LT		 916 d->raid_disk = rdev2->raid_disk;
917 else
918 d->raid_disk = rdev2->desc_nr; /* compatibility */
1be7892f 919 if (test_bit(Faulty, &rdev2->flags))
1da177e4 920 d->state = (1<<MD_DISK_FAULTY);
1be7892f 921 else if (test_bit(In_sync, &rdev2->flags)) {
1da177e4
LT		 922 d->state = (1<<MD_DISK_ACTIVE);
923 d->state |= (1<<MD_DISK_SYNC);
924 active++;
925 working++;
926 } else {
927 d->state = 0;
928 spare++;
929 working++;
930 }
8ddf9efe
N		 931 if (test_bit(WriteMostly, &rdev2->flags))
932 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4 933 }
1da177e4
LT		 934 /* now set the "removed" and "faulty" bits on any missing devices */
935 for (i=0 ; i < mddev->raid_disks ; i++) {
936 mdp_disk_t *d = &sb->disks[i];
937 if (d->state == 0 && d->number == 0) {
938 d->number = i;
939 d->raid_disk = i;
940 d->state = (1<<MD_DISK_REMOVED);
941 d->state |= (1<<MD_DISK_FAULTY);
942 failed++;
943 }
944 }
945 sb->nr_disks = nr_disks;
946 sb->active_disks = active;
947 sb->working_disks = working;
948 sb->failed_disks = failed;
949 sb->spare_disks = spare;
950
951 sb->this_disk = sb->disks[rdev->desc_nr];
952 sb->sb_csum = calc_sb_csum(sb);
953}
954
955/*
956 * version 1 superblock
957 */
958
959static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
960{
961 unsigned int disk_csum, csum;
962 unsigned long long newcsum;
963 int size = 256 + le32_to_cpu(sb->max_dev)*2;
964 unsigned int *isuper = (unsigned int*)sb;
965 int i;
966
967 disk_csum = sb->sb_csum;
968 sb->sb_csum = 0;
969 newcsum = 0;
970 for (i=0; size>=4; size -= 4 )
971 newcsum += le32_to_cpu(*isuper++);
972
973 if (size == 2)
974 newcsum += le16_to_cpu(*(unsigned short*) isuper);
975
976 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
977 sb->sb_csum = disk_csum;
978 return cpu_to_le32(csum);
979}
980
981static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
982{
983 struct mdp_superblock_1 *sb;
984 int ret;
985 sector_t sb_offset;
986 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 987 int bmask;
1da177e4
LT		 988
989 /*
990 * Calculate the position of the superblock.
991 * It is always aligned to a 4K boundary and
992 * depeding on minor_version, it can be:
993 * 0: At least 8K, but less than 12K, from end of device
994 * 1: At start of device
995 * 2: 4K from start of device.
996 */
997 switch(minor_version) {
998 case 0:
999 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1000 sb_offset -= 8*2;
39730960 1001 sb_offset &= ~(sector_t)(4*2-1);
1da177e4
LT		 1002 /* convert from sectors to K */
1003 sb_offset /= 2;
1004 break;
1005 case 1:
1006 sb_offset = 0;
1007 break;
1008 case 2:
1009 sb_offset = 4;
1010 break;
1011 default:
1012 return -EINVAL;
1013 }
1014 rdev->sb_offset = sb_offset;
1015
0002b271
N		 1016 /* superblock is rarely larger than 1K, but it can be larger,
1017 * and it is safe to read 4k, so we do that
1018 */
1019 ret = read_disk_sb(rdev, 4096);
1da177e4
LT		 1020 if (ret) return ret;
1021
1022
1023 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1024
1025 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1026 sb->major_version != cpu_to_le32(1) ||
1027 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1028 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
71c0805c 1029 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT		 1030 return -EINVAL;
1031
1032 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1033 printk("md: invalid superblock checksum on %s\n",
1034 bdevname(rdev->bdev,b));
1035 return -EINVAL;
1036 }
1037 if (le64_to_cpu(sb->data_size) < 10) {
1038 printk("md: data_size too small on %s\n",
1039 bdevname(rdev->bdev,b));
1040 return -EINVAL;
1041 }
1042 rdev->preferred_minor = 0xffff;
1043 rdev->data_offset = le64_to_cpu(sb->data_offset);
4dbcdc75 1044 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1da177e4 1045
0002b271 1046 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
720a3dc3 1047 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
0002b271
N		 1048 if (rdev->sb_size & bmask)
1049 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1050
1da177e4 1051 if (refdev == 0)
8ed75463 1052 ret = 1;
1da177e4
LT		 1053 else {
1054 __u64 ev1, ev2;
1055 struct mdp_superblock_1 *refsb =
1056 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1057
1058 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1059 sb->level != refsb->level ||
1060 sb->layout != refsb->layout ||
1061 sb->chunksize != refsb->chunksize) {
1062 printk(KERN_WARNING "md: %s has strangely different"
1063 " superblock to %s\n",
1064 bdevname(rdev->bdev,b),
1065 bdevname(refdev->bdev,b2));
1066 return -EINVAL;
1067 }
1068 ev1 = le64_to_cpu(sb->events);
1069 ev2 = le64_to_cpu(refsb->events);
1070
1071 if (ev1 > ev2)
8ed75463
N		 1072 ret = 1;
1073 else
1074 ret = 0;
1da177e4
LT		 1075 }
1076 if (minor_version)
1077 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1078 else
1079 rdev->size = rdev->sb_offset;
1080 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1081 return -EINVAL;
1082 rdev->size = le64_to_cpu(sb->data_size)/2;
1083 if (le32_to_cpu(sb->chunksize))
1084 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
2bf071bf
N		 1085
1086 if (le32_to_cpu(sb->size) > rdev->size*2)
1087 return -EINVAL;
8ed75463 1088 return ret;
1da177e4
LT		 1089}
1090
1091static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1092{
1093 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1094
41158c7e 1095 rdev->raid_disk = -1;
b2d444d7 1096 rdev->flags = 0;
1da177e4
LT		 1097 if (mddev->raid_disks == 0) {
1098 mddev->major_version = 1;
1099 mddev->patch_version = 0;
1100 mddev->persistent = 1;
1101 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1102 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1103 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1104 mddev->level = le32_to_cpu(sb->level);
d9d166c2 1105 mddev->clevel[0] = 0;
1da177e4
LT		 1106 mddev->layout = le32_to_cpu(sb->layout);
1107 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1108 mddev->size = le64_to_cpu(sb->size)/2;
1109 mddev->events = le64_to_cpu(sb->events);
9223214e 1110 mddev->bitmap_offset = 0;
29fc7e3e 1111 mddev->default_bitmap_offset = 1024 >> 9;
1da177e4
LT		 1112
1113 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1114 memcpy(mddev->uuid, sb->set_uuid, 16);
1115
1116 mddev->max_disks = (4096-256)/2;
a654b9d8 1117
71c0805c 1118 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
a654b9d8 1119 mddev->bitmap_file == NULL ) {
6cce3b23
N		 1120 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
1121 && mddev->level != 10) {
1122 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
a654b9d8
N		 1123 return -EINVAL;
1124 }
1125 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1126 }
f6705578
N		 1127 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1128 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1129 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1130 mddev->new_level = le32_to_cpu(sb->new_level);
1131 mddev->new_layout = le32_to_cpu(sb->new_layout);
1132 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1133 } else {
1134 mddev->reshape_position = MaxSector;
1135 mddev->delta_disks = 0;
1136 mddev->new_level = mddev->level;
1137 mddev->new_layout = mddev->layout;
1138 mddev->new_chunk = mddev->chunk_size;
1139 }
1140
41158c7e
N		 1141 } else if (mddev->pers == NULL) {
1142 /* Insist of good event counter while assembling */
1143 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4
LT		 1144 ++ev1;
1145 if (ev1 < mddev->events)
1146 return -EINVAL;
41158c7e
N		 1147 } else if (mddev->bitmap) {
1148 /* If adding to array with a bitmap, then we can accept an
1149 * older device, but not too old.
1150 */
1151 __u64 ev1 = le64_to_cpu(sb->events);
1152 if (ev1 < mddev->bitmap->events_cleared)
1153 return 0;
1154 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1155 return 0;
1da177e4
LT		 1156
1157 if (mddev->level != LEVEL_MULTIPATH) {
1158 int role;
1159 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1160 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1161 switch(role) {
1162 case 0xffff: /* spare */
1da177e4
LT		 1163 break;
1164 case 0xfffe: /* faulty */
b2d444d7 1165 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 1166 break;
1167 default:
b2d444d7 1168 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1169 rdev->raid_disk = role;
1170 break;
1171 }
8ddf9efe
N		 1172 if (sb->devflags & WriteMostly1)
1173 set_bit(WriteMostly, &rdev->flags);
41158c7e 1174 } else /* MULTIPATH are always insync */
b2d444d7 1175 set_bit(In_sync, &rdev->flags);
41158c7e 1176
1da177e4
LT		 1177 return 0;
1178}
1179
1180static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1181{
1182 struct mdp_superblock_1 *sb;
1183 struct list_head *tmp;
1184 mdk_rdev_t *rdev2;
1185 int max_dev, i;
1186 /* make rdev->sb match mddev and rdev data. */
1187
1188 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1189
1190 sb->feature_map = 0;
1191 sb->pad0 = 0;
1192 memset(sb->pad1, 0, sizeof(sb->pad1));
1193 memset(sb->pad2, 0, sizeof(sb->pad2));
1194 memset(sb->pad3, 0, sizeof(sb->pad3));
1195
1196 sb->utime = cpu_to_le64((__u64)mddev->utime);
1197 sb->events = cpu_to_le64(mddev->events);
1198 if (mddev->in_sync)
1199 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1200 else
1201 sb->resync_offset = cpu_to_le64(0);
1202
4dbcdc75
N		 1203 sb->cnt_corrected_read = atomic_read(&rdev->corrected_errors);
1204
f0ca340c 1205 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
29fc7e3e 1206 sb->size = cpu_to_le64(mddev->size<<1);
f0ca340c 1207
a654b9d8
N		 1208 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1209 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
71c0805c 1210 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8 1211 }
f6705578
N		 1212 if (mddev->reshape_position != MaxSector) {
1213 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1214 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1215 sb->new_layout = cpu_to_le32(mddev->new_layout);
1216 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1217 sb->new_level = cpu_to_le32(mddev->new_level);
1218 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1219 }
a654b9d8 1220
1da177e4
LT		 1221 max_dev = 0;
1222 ITERATE_RDEV(mddev,rdev2,tmp)
1223 if (rdev2->desc_nr+1 > max_dev)
1224 max_dev = rdev2->desc_nr+1;
1225
1226 sb->max_dev = cpu_to_le32(max_dev);
1227 for (i=0; i<max_dev;i++)
1228 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1229
1230 ITERATE_RDEV(mddev,rdev2,tmp) {
1231 i = rdev2->desc_nr;
b2d444d7 1232 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1233 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1234 else if (test_bit(In_sync, &rdev2->flags))
1da177e4
LT		 1235 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1236 else
1237 sb->dev_roles[i] = cpu_to_le16(0xffff);
1238 }
1239
1240 sb->recovery_offset = cpu_to_le64(0); /* not supported yet */
1241 sb->sb_csum = calc_sb_1_csum(sb);
1242}
1243
1244
75c96f85 1245static struct super_type super_types[] = {
1da177e4
LT		 1246 [0] = {
1247 .name = "0.90.0",
1248 .owner = THIS_MODULE,
1249 .load_super = super_90_load,
1250 .validate_super = super_90_validate,
1251 .sync_super = super_90_sync,
1252 },
1253 [1] = {
1254 .name = "md-1",
1255 .owner = THIS_MODULE,
1256 .load_super = super_1_load,
1257 .validate_super = super_1_validate,
1258 .sync_super = super_1_sync,
1259 },
1260};
1261
1262static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1263{
1264 struct list_head *tmp;
1265 mdk_rdev_t *rdev;
1266
1267 ITERATE_RDEV(mddev,rdev,tmp)
1268 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1269 return rdev;
1270
1271 return NULL;
1272}
1273
1274static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1275{
1276 struct list_head *tmp;
1277 mdk_rdev_t *rdev;
1278
1279 ITERATE_RDEV(mddev1,rdev,tmp)
1280 if (match_dev_unit(mddev2, rdev))
1281 return 1;
1282
1283 return 0;
1284}
1285
1286static LIST_HEAD(pending_raid_disks);
1287
1288static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1289{
1290 mdk_rdev_t *same_pdev;
1291 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
f637b9f9 1292 struct kobject *ko;
1edf80d3 1293 char *s;
1da177e4
LT		 1294
1295 if (rdev->mddev) {
1296 MD_BUG();
1297 return -EINVAL;
1298 }
2bf071bf
N		 1299 /* make sure rdev->size exceeds mddev->size */
1300 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1301 if (mddev->pers)
1302 /* Cannot change size, so fail */
1303 return -ENOSPC;
1304 else
1305 mddev->size = rdev->size;
1306 }
1da177e4
LT		 1307 same_pdev = match_dev_unit(mddev, rdev);
1308 if (same_pdev)
1309 printk(KERN_WARNING
1310 "%s: WARNING: %s appears to be on the same physical"
1311 " disk as %s. True\n protection against single-disk"
1312 " failure might be compromised.\n",
1313 mdname(mddev), bdevname(rdev->bdev,b),
1314 bdevname(same_pdev->bdev,b2));
1315
1316 /* Verify rdev->desc_nr is unique.
1317 * If it is -1, assign a free number, else
1318 * check number is not in use
1319 */
1320 if (rdev->desc_nr < 0) {
1321 int choice = 0;
1322 if (mddev->pers) choice = mddev->raid_disks;
1323 while (find_rdev_nr(mddev, choice))
1324 choice++;
1325 rdev->desc_nr = choice;
1326 } else {
1327 if (find_rdev_nr(mddev, rdev->desc_nr))
1328 return -EBUSY;
1329 }
19133a42
N		 1330 bdevname(rdev->bdev,b);
1331 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1332 return -ENOMEM;
1edf80d3
NB		 1333 while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
1334 *s = '!';
1da177e4
LT		 1335
1336 list_add(&rdev->same_set, &mddev->disks);
1337 rdev->mddev = mddev;
19133a42 1338 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 1339
9c791977 1340 rdev->kobj.parent = &mddev->kobj;
86e6ffdd
N		 1341 kobject_add(&rdev->kobj);
1342
f637b9f9
N		 1343 if (rdev->bdev->bd_part)
1344 ko = &rdev->bdev->bd_part->kobj;
1345 else
1346 ko = &rdev->bdev->bd_disk->kobj;
1347 sysfs_create_link(&rdev->kobj, ko, "block");
5463c790 1348 bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
1da177e4
LT		 1349 return 0;
1350}
1351
1352static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1353{
1354 char b[BDEVNAME_SIZE];
1355 if (!rdev->mddev) {
1356 MD_BUG();
1357 return;
1358 }
5463c790 1359 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1da177e4
LT		 1360 list_del_init(&rdev->same_set);
1361 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1362 rdev->mddev = NULL;
86e6ffdd
N		 1363 sysfs_remove_link(&rdev->kobj, "block");
1364 kobject_del(&rdev->kobj);
1da177e4
LT		 1365}
1366
1367/*
1368 * prevent the device from being mounted, repartitioned or
1369 * otherwise reused by a RAID array (or any other kernel
1370 * subsystem), by bd_claiming the device.
1371 */
1372static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1373{
1374 int err = 0;
1375 struct block_device *bdev;
1376 char b[BDEVNAME_SIZE];
1377
1378 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1379 if (IS_ERR(bdev)) {
1380 printk(KERN_ERR "md: could not open %s.\n",
1381 __bdevname(dev, b));
1382 return PTR_ERR(bdev);
1383 }
1384 err = bd_claim(bdev, rdev);
1385 if (err) {
1386 printk(KERN_ERR "md: could not bd_claim %s.\n",
1387 bdevname(bdev, b));
1388 blkdev_put(bdev);
1389 return err;
1390 }
1391 rdev->bdev = bdev;
1392 return err;
1393}
1394
1395static void unlock_rdev(mdk_rdev_t *rdev)
1396{
1397 struct block_device *bdev = rdev->bdev;
1398 rdev->bdev = NULL;
1399 if (!bdev)
1400 MD_BUG();
1401 bd_release(bdev);
1402 blkdev_put(bdev);
1403}
1404
1405void md_autodetect_dev(dev_t dev);
1406
1407static void export_rdev(mdk_rdev_t * rdev)
1408{
1409 char b[BDEVNAME_SIZE];
1410 printk(KERN_INFO "md: export_rdev(%s)\n",
1411 bdevname(rdev->bdev,b));
1412 if (rdev->mddev)
1413 MD_BUG();
1414 free_disk_sb(rdev);
1415 list_del_init(&rdev->same_set);
1416#ifndef MODULE
1417 md_autodetect_dev(rdev->bdev->bd_dev);
1418#endif
1419 unlock_rdev(rdev);
86e6ffdd 1420 kobject_put(&rdev->kobj);
1da177e4
LT		 1421}
1422
1423static void kick_rdev_from_array(mdk_rdev_t * rdev)
1424{
1425 unbind_rdev_from_array(rdev);
1426 export_rdev(rdev);
1427}
1428
1429static void export_array(mddev_t *mddev)
1430{
1431 struct list_head *tmp;
1432 mdk_rdev_t *rdev;
1433
1434 ITERATE_RDEV(mddev,rdev,tmp) {
1435 if (!rdev->mddev) {
1436 MD_BUG();
1437 continue;
1438 }
1439 kick_rdev_from_array(rdev);
1440 }
1441 if (!list_empty(&mddev->disks))
1442 MD_BUG();
1443 mddev->raid_disks = 0;
1444 mddev->major_version = 0;
1445}
1446
1447static void print_desc(mdp_disk_t *desc)
1448{
1449 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1450 desc->major,desc->minor,desc->raid_disk,desc->state);
1451}
1452
1453static void print_sb(mdp_super_t *sb)
1454{
1455 int i;
1456
1457 printk(KERN_INFO
1458 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1459 sb->major_version, sb->minor_version, sb->patch_version,
1460 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1461 sb->ctime);
1462 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1463 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1464 sb->md_minor, sb->layout, sb->chunk_size);
1465 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1466 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1467 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1468 sb->failed_disks, sb->spare_disks,
1469 sb->sb_csum, (unsigned long)sb->events_lo);
1470
1471 printk(KERN_INFO);
1472 for (i = 0; i < MD_SB_DISKS; i++) {
1473 mdp_disk_t *desc;
1474
1475 desc = sb->disks + i;
1476 if (desc->number || desc->major || desc->minor ||
1477 desc->raid_disk || (desc->state && (desc->state != 4))) {
1478 printk(" D %2d: ", i);
1479 print_desc(desc);
1480 }
1481 }
1482 printk(KERN_INFO "md: THIS: ");
1483 print_desc(&sb->this_disk);
1484
1485}
1486
1487static void print_rdev(mdk_rdev_t *rdev)
1488{
1489 char b[BDEVNAME_SIZE];
1490 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1491 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
b2d444d7
N		 1492 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1493 rdev->desc_nr);
1da177e4
LT		 1494 if (rdev->sb_loaded) {
1495 printk(KERN_INFO "md: rdev superblock:\n");
1496 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1497 } else
1498 printk(KERN_INFO "md: no rdev superblock!\n");
1499}
1500
1501void md_print_devices(void)
1502{
1503 struct list_head *tmp, *tmp2;
1504 mdk_rdev_t *rdev;
1505 mddev_t *mddev;
1506 char b[BDEVNAME_SIZE];
1507
1508 printk("\n");
1509 printk("md: **********************************\n");
1510 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1511 printk("md: **********************************\n");
1512 ITERATE_MDDEV(mddev,tmp) {
1da177e4 1513
32a7627c
N		 1514 if (mddev->bitmap)
1515 bitmap_print_sb(mddev->bitmap);
1516 else
1517 printk("%s: ", mdname(mddev));
1da177e4
LT		 1518 ITERATE_RDEV(mddev,rdev,tmp2)
1519 printk("<%s>", bdevname(rdev->bdev,b));
1520 printk("\n");
1521
1522 ITERATE_RDEV(mddev,rdev,tmp2)
1523 print_rdev(rdev);
1524 }
1525 printk("md: **********************************\n");
1526 printk("\n");
1527}
1528
1529
1da177e4
LT		 1530static void sync_sbs(mddev_t * mddev)
1531{
1532 mdk_rdev_t *rdev;
1533 struct list_head *tmp;
1534
1535 ITERATE_RDEV(mddev,rdev,tmp) {
1536 super_types[mddev->major_version].
1537 sync_super(mddev, rdev);
1538 rdev->sb_loaded = 1;
1539 }
1540}
1541
f6705578 1542void md_update_sb(mddev_t * mddev)
1da177e4 1543{
7bfa19f2 1544 int err;
1da177e4
LT		 1545 struct list_head *tmp;
1546 mdk_rdev_t *rdev;
06d91a5f 1547 int sync_req;
1da177e4 1548
1da177e4 1549repeat:
a9701a30 1550 spin_lock_irq(&mddev->write_lock);
06d91a5f 1551 sync_req = mddev->in_sync;
1da177e4
LT		 1552 mddev->utime = get_seconds();
1553 mddev->events ++;
1554
1555 if (!mddev->events) {
1556 /*
1557 * oops, this 64-bit counter should never wrap.
1558 * Either we are in around ~1 trillion A.C., assuming
1559 * 1 reboot per second, or we have a bug:
1560 */
1561 MD_BUG();
1562 mddev->events --;
1563 }
7bfa19f2 1564 mddev->sb_dirty = 2;
1da177e4
LT		 1565 sync_sbs(mddev);
1566
1567 /*
1568 * do not write anything to disk if using
1569 * nonpersistent superblocks
1570 */
06d91a5f
N		 1571 if (!mddev->persistent) {
1572 mddev->sb_dirty = 0;
a9701a30 1573 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1574 wake_up(&mddev->sb_wait);
1da177e4 1575 return;
06d91a5f 1576 }
a9701a30 1577 spin_unlock_irq(&mddev->write_lock);
1da177e4
LT		 1578
1579 dprintk(KERN_INFO
1580 "md: updating %s RAID superblock on device (in sync %d)\n",
1581 mdname(mddev),mddev->in_sync);
1582
32a7627c 1583 err = bitmap_update_sb(mddev->bitmap);
1da177e4
LT		 1584 ITERATE_RDEV(mddev,rdev,tmp) {
1585 char b[BDEVNAME_SIZE];
1586 dprintk(KERN_INFO "md: ");
b2d444d7 1587 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1588 dprintk("(skipping faulty ");
1589
1590 dprintk("%s ", bdevname(rdev->bdev,b));
b2d444d7 1591 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 1592 md_super_write(mddev,rdev,
0002b271 1593 rdev->sb_offset<<1, rdev->sb_size,
7bfa19f2
N		 1594 rdev->sb_page);
1595 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1596 bdevname(rdev->bdev,b),
1597 (unsigned long long)rdev->sb_offset);
1598
1da177e4
LT		 1599 } else
1600 dprintk(")\n");
7bfa19f2 1601 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT		 1602 /* only need to write one superblock... */
1603 break;
1604 }
a9701a30 1605 md_super_wait(mddev);
7bfa19f2
N		 1606 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1607
a9701a30 1608 spin_lock_irq(&mddev->write_lock);
7bfa19f2 1609 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
06d91a5f 1610 /* have to write it out again */
a9701a30 1611 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N		 1612 goto repeat;
1613 }
1614 mddev->sb_dirty = 0;
a9701a30 1615 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1616 wake_up(&mddev->sb_wait);
06d91a5f 1617
1da177e4 1618}
f6705578 1619EXPORT_SYMBOL_GPL(md_update_sb);
1da177e4 1620
bce74dac
N		 1621/* words written to sysfs files may, or my not, be \n terminated.
1622 * We want to accept with case. For this we use cmd_match.
1623 */
1624static int cmd_match(const char *cmd, const char *str)
1625{
1626 /* See if cmd, written into a sysfs file, matches
1627 * str. They must either be the same, or cmd can
1628 * have a trailing newline
1629 */
1630 while (*cmd && *str && *cmd == *str) {
1631 cmd++;
1632 str++;
1633 }
1634 if (*cmd == '\n')
1635 cmd++;
1636 if (*str || *cmd)
1637 return 0;
1638 return 1;
1639}
1640
86e6ffdd
N		 1641struct rdev_sysfs_entry {
1642 struct attribute attr;
1643 ssize_t (*show)(mdk_rdev_t *, char *);
1644 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1645};
1646
1647static ssize_t
96de1e66 1648state_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1649{
1650 char *sep = "";
1651 int len=0;
1652
b2d444d7 1653 if (test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 1654 len+= sprintf(page+len, "%sfaulty",sep);
1655 sep = ",";
1656 }
b2d444d7 1657 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1658 len += sprintf(page+len, "%sin_sync",sep);
1659 sep = ",";
1660 }
b2d444d7
N		 1661 if (!test_bit(Faulty, &rdev->flags) &&
1662 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1663 len += sprintf(page+len, "%sspare", sep);
1664 sep = ",";
1665 }
1666 return len+sprintf(page+len, "\n");
1667}
1668
96de1e66
N		 1669static struct rdev_sysfs_entry
1670rdev_state = __ATTR_RO(state);
86e6ffdd
N		 1671
1672static ssize_t
96de1e66 1673super_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1674{
1675 if (rdev->sb_loaded && rdev->sb_size) {
1676 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1677 return rdev->sb_size;
1678 } else
1679 return 0;
1680}
96de1e66
N		 1681static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1682
4dbcdc75
N		 1683static ssize_t
1684errors_show(mdk_rdev_t *rdev, char *page)
1685{
1686 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1687}
1688
1689static ssize_t
1690errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1691{
1692 char *e;
1693 unsigned long n = simple_strtoul(buf, &e, 10);
1694 if (*buf && (*e == 0 || *e == '\n')) {
1695 atomic_set(&rdev->corrected_errors, n);
1696 return len;
1697 }
1698 return -EINVAL;
1699}
1700static struct rdev_sysfs_entry rdev_errors =
1701__ATTR(errors, 0644, errors_show, errors_store);
1702
014236d2
N		 1703static ssize_t
1704slot_show(mdk_rdev_t *rdev, char *page)
1705{
1706 if (rdev->raid_disk < 0)
1707 return sprintf(page, "none\n");
1708 else
1709 return sprintf(page, "%d\n", rdev->raid_disk);
1710}
1711
1712static ssize_t
1713slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1714{
1715 char *e;
1716 int slot = simple_strtoul(buf, &e, 10);
1717 if (strncmp(buf, "none", 4)==0)
1718 slot = -1;
1719 else if (e==buf || (*e && *e!= '\n'))
1720 return -EINVAL;
1721 if (rdev->mddev->pers)
1722 /* Cannot set slot in active array (yet) */
1723 return -EBUSY;
1724 if (slot >= rdev->mddev->raid_disks)
1725 return -ENOSPC;
1726 rdev->raid_disk = slot;
1727 /* assume it is working */
1728 rdev->flags = 0;
1729 set_bit(In_sync, &rdev->flags);
1730 return len;
1731}
1732
1733
1734static struct rdev_sysfs_entry rdev_slot =
1735__ATTR(slot, 0644, slot_show, slot_store);
1736
93c8cad0
N		 1737static ssize_t
1738offset_show(mdk_rdev_t *rdev, char *page)
1739{
6961ece4 1740 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
93c8cad0
N		 1741}
1742
1743static ssize_t
1744offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1745{
1746 char *e;
1747 unsigned long long offset = simple_strtoull(buf, &e, 10);
1748 if (e==buf || (*e && *e != '\n'))
1749 return -EINVAL;
1750 if (rdev->mddev->pers)
1751 return -EBUSY;
1752 rdev->data_offset = offset;
1753 return len;
1754}
1755
1756static struct rdev_sysfs_entry rdev_offset =
1757__ATTR(offset, 0644, offset_show, offset_store);
1758
83303b61
N		 1759static ssize_t
1760rdev_size_show(mdk_rdev_t *rdev, char *page)
1761{
1762 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1763}
1764
1765static ssize_t
1766rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1767{
1768 char *e;
1769 unsigned long long size = simple_strtoull(buf, &e, 10);
1770 if (e==buf || (*e && *e != '\n'))
1771 return -EINVAL;
1772 if (rdev->mddev->pers)
1773 return -EBUSY;
1774 rdev->size = size;
1775 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1776 rdev->mddev->size = size;
1777 return len;
1778}
1779
1780static struct rdev_sysfs_entry rdev_size =
1781__ATTR(size, 0644, rdev_size_show, rdev_size_store);
1782
86e6ffdd
N		 1783static struct attribute *rdev_default_attrs[] = {
1784 &rdev_state.attr,
1785 &rdev_super.attr,
4dbcdc75 1786 &rdev_errors.attr,
014236d2 1787 &rdev_slot.attr,
93c8cad0 1788 &rdev_offset.attr,
83303b61 1789 &rdev_size.attr,
86e6ffdd
N		 1790 NULL,
1791};
1792static ssize_t
1793rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1794{
1795 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1796 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1797
1798 if (!entry->show)
1799 return -EIO;
1800 return entry->show(rdev, page);
1801}
1802
1803static ssize_t
1804rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1805 const char *page, size_t length)
1806{
1807 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1808 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1809
1810 if (!entry->store)
1811 return -EIO;
1812 return entry->store(rdev, page, length);
1813}
1814
1815static void rdev_free(struct kobject *ko)
1816{
1817 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1818 kfree(rdev);
1819}
1820static struct sysfs_ops rdev_sysfs_ops = {
1821 .show = rdev_attr_show,
1822 .store = rdev_attr_store,
1823};
1824static struct kobj_type rdev_ktype = {
1825 .release = rdev_free,
1826 .sysfs_ops = &rdev_sysfs_ops,
1827 .default_attrs = rdev_default_attrs,
1828};
1829
1da177e4
LT		 1830/*
1831 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1832 *
1833 * mark the device faulty if:
1834 *
1835 * - the device is nonexistent (zero size)
1836 * - the device has no valid superblock
1837 *
1838 * a faulty rdev _never_ has rdev->sb set.
1839 */
1840static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1841{
1842 char b[BDEVNAME_SIZE];
1843 int err;
1844 mdk_rdev_t *rdev;
1845 sector_t size;
1846
9ffae0cf 1847 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1da177e4
LT		 1848 if (!rdev) {
1849 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1850 return ERR_PTR(-ENOMEM);
1851 }
1da177e4
LT		 1852
1853 if ((err = alloc_disk_sb(rdev)))
1854 goto abort_free;
1855
1856 err = lock_rdev(rdev, newdev);
1857 if (err)
1858 goto abort_free;
1859
86e6ffdd
N		 1860 rdev->kobj.parent = NULL;
1861 rdev->kobj.ktype = &rdev_ktype;
1862 kobject_init(&rdev->kobj);
1863
1da177e4 1864 rdev->desc_nr = -1;
b2d444d7 1865 rdev->flags = 0;
1da177e4
LT		 1866 rdev->data_offset = 0;
1867 atomic_set(&rdev->nr_pending, 0);
ba22dcbf 1868 atomic_set(&rdev->read_errors, 0);
4dbcdc75 1869 atomic_set(&rdev->corrected_errors, 0);
1da177e4
LT		 1870
1871 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
1872 if (!size) {
1873 printk(KERN_WARNING
1874 "md: %s has zero or unknown size, marking faulty!\n",
1875 bdevname(rdev->bdev,b));
1876 err = -EINVAL;
1877 goto abort_free;
1878 }
1879
1880 if (super_format >= 0) {
1881 err = super_types[super_format].
1882 load_super(rdev, NULL, super_minor);
1883 if (err == -EINVAL) {
1884 printk(KERN_WARNING
1885 "md: %s has invalid sb, not importing!\n",
1886 bdevname(rdev->bdev,b));
1887 goto abort_free;
1888 }
1889 if (err < 0) {
1890 printk(KERN_WARNING
1891 "md: could not read %s's sb, not importing!\n",
1892 bdevname(rdev->bdev,b));
1893 goto abort_free;
1894 }
1895 }
1896 INIT_LIST_HEAD(&rdev->same_set);
1897
1898 return rdev;
1899
1900abort_free:
1901 if (rdev->sb_page) {
1902 if (rdev->bdev)
1903 unlock_rdev(rdev);
1904 free_disk_sb(rdev);
1905 }
1906 kfree(rdev);
1907 return ERR_PTR(err);
1908}
1909
1910/*
1911 * Check a full RAID array for plausibility
1912 */
1913
1914
a757e64c 1915static void analyze_sbs(mddev_t * mddev)
1da177e4
LT		 1916{
1917 int i;
1918 struct list_head *tmp;
1919 mdk_rdev_t *rdev, *freshest;
1920 char b[BDEVNAME_SIZE];
1921
1922 freshest = NULL;
1923 ITERATE_RDEV(mddev,rdev,tmp)
1924 switch (super_types[mddev->major_version].
1925 load_super(rdev, freshest, mddev->minor_version)) {
1926 case 1:
1927 freshest = rdev;
1928 break;
1929 case 0:
1930 break;
1931 default:
1932 printk( KERN_ERR \
1933 "md: fatal superblock inconsistency in %s"
1934 " -- removing from array\n",
1935 bdevname(rdev->bdev,b));
1936 kick_rdev_from_array(rdev);
1937 }
1938
1939
1940 super_types[mddev->major_version].
1941 validate_super(mddev, freshest);
1942
1943 i = 0;
1944 ITERATE_RDEV(mddev,rdev,tmp) {
1945 if (rdev != freshest)
1946 if (super_types[mddev->major_version].
1947 validate_super(mddev, rdev)) {
1948 printk(KERN_WARNING "md: kicking non-fresh %s"
1949 " from array!\n",
1950 bdevname(rdev->bdev,b));
1951 kick_rdev_from_array(rdev);
1952 continue;
1953 }
1954 if (mddev->level == LEVEL_MULTIPATH) {
1955 rdev->desc_nr = i++;
1956 rdev->raid_disk = rdev->desc_nr;
b2d444d7 1957 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1958 }
1959 }
1960
1961
1962
1963 if (mddev->recovery_cp != MaxSector &&
1964 mddev->level >= 1)
1965 printk(KERN_ERR "md: %s: raid array is not clean"
1966 " -- starting background reconstruction\n",
1967 mdname(mddev));
1968
1da177e4
LT		 1969}
1970
eae1701f 1971static ssize_t
96de1e66 1972level_show(mddev_t *mddev, char *page)
eae1701f 1973{
2604b703 1974 struct mdk_personality *p = mddev->pers;
d9d166c2 1975 if (p)
eae1701f 1976 return sprintf(page, "%s\n", p->name);
d9d166c2
N		 1977 else if (mddev->clevel[0])
1978 return sprintf(page, "%s\n", mddev->clevel);
1979 else if (mddev->level != LEVEL_NONE)
1980 return sprintf(page, "%d\n", mddev->level);
1981 else
1982 return 0;
eae1701f
N		 1983}
1984
d9d166c2
N		 1985static ssize_t
1986level_store(mddev_t *mddev, const char *buf, size_t len)
1987{
1988 int rv = len;
1989 if (mddev->pers)
1990 return -EBUSY;
1991 if (len == 0)
1992 return 0;
1993 if (len >= sizeof(mddev->clevel))
1994 return -ENOSPC;
1995 strncpy(mddev->clevel, buf, len);
1996 if (mddev->clevel[len-1] == '\n')
1997 len--;
1998 mddev->clevel[len] = 0;
1999 mddev->level = LEVEL_NONE;
2000 return rv;
2001}
2002
2003static struct md_sysfs_entry md_level =
2004__ATTR(level, 0644, level_show, level_store);
eae1701f
N		 2005
2006static ssize_t
96de1e66 2007raid_disks_show(mddev_t *mddev, char *page)
eae1701f 2008{
bb636547
N		 2009 if (mddev->raid_disks == 0)
2010 return 0;
eae1701f
N		 2011 return sprintf(page, "%d\n", mddev->raid_disks);
2012}
2013
da943b99
N		 2014static int update_raid_disks(mddev_t *mddev, int raid_disks);
2015
2016static ssize_t
2017raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2018{
2019 /* can only set raid_disks if array is not yet active */
2020 char *e;
2021 int rv = 0;
2022 unsigned long n = simple_strtoul(buf, &e, 10);
2023
2024 if (!*buf || (*e && *e != '\n'))
2025 return -EINVAL;
2026
2027 if (mddev->pers)
2028 rv = update_raid_disks(mddev, n);
2029 else
2030 mddev->raid_disks = n;
2031 return rv ? rv : len;
2032}
2033static struct md_sysfs_entry md_raid_disks =
2034__ATTR(raid_disks, 0644, raid_disks_show, raid_disks_store);
eae1701f 2035
3b34380a
N		 2036static ssize_t
2037chunk_size_show(mddev_t *mddev, char *page)
2038{
2039 return sprintf(page, "%d\n", mddev->chunk_size);
2040}
2041
2042static ssize_t
2043chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2044{
2045 /* can only set chunk_size if array is not yet active */
2046 char *e;
2047 unsigned long n = simple_strtoul(buf, &e, 10);
2048
2049 if (mddev->pers)
2050 return -EBUSY;
2051 if (!*buf || (*e && *e != '\n'))
2052 return -EINVAL;
2053
2054 mddev->chunk_size = n;
2055 return len;
2056}
2057static struct md_sysfs_entry md_chunk_size =
2058__ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
2059
6d7ff738
N		 2060static ssize_t
2061null_show(mddev_t *mddev, char *page)
2062{
2063 return -EINVAL;
2064}
2065
2066static ssize_t
2067new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2068{
2069 /* buf must be %d:%d\n? giving major and minor numbers */
2070 /* The new device is added to the array.
2071 * If the array has a persistent superblock, we read the
2072 * superblock to initialise info and check validity.
2073 * Otherwise, only checking done is that in bind_rdev_to_array,
2074 * which mainly checks size.
2075 */
2076 char *e;
2077 int major = simple_strtoul(buf, &e, 10);
2078 int minor;
2079 dev_t dev;
2080 mdk_rdev_t *rdev;
2081 int err;
2082
2083 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2084 return -EINVAL;
2085 minor = simple_strtoul(e+1, &e, 10);
2086 if (*e && *e != '\n')
2087 return -EINVAL;
2088 dev = MKDEV(major, minor);
2089 if (major != MAJOR(dev) ||
2090 minor != MINOR(dev))
2091 return -EOVERFLOW;
2092
2093
2094 if (mddev->persistent) {
2095 rdev = md_import_device(dev, mddev->major_version,
2096 mddev->minor_version);
2097 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2098 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2099 mdk_rdev_t, same_set);
2100 err = super_types[mddev->major_version]
2101 .load_super(rdev, rdev0, mddev->minor_version);
2102 if (err < 0)
2103 goto out;
2104 }
2105 } else
2106 rdev = md_import_device(dev, -1, -1);
2107
2108 if (IS_ERR(rdev))
2109 return PTR_ERR(rdev);
2110 err = bind_rdev_to_array(rdev, mddev);
2111 out:
2112 if (err)
2113 export_rdev(rdev);
2114 return err ? err : len;
2115}
2116
2117static struct md_sysfs_entry md_new_device =
2118__ATTR(new_dev, 0200, null_show, new_dev_store);
3b34380a 2119
a35b0d69
N		 2120static ssize_t
2121size_show(mddev_t *mddev, char *page)
2122{
2123 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2124}
2125
2126static int update_size(mddev_t *mddev, unsigned long size);
2127
2128static ssize_t
2129size_store(mddev_t *mddev, const char *buf, size_t len)
2130{
2131 /* If array is inactive, we can reduce the component size, but
2132 * not increase it (except from 0).
2133 * If array is active, we can try an on-line resize
2134 */
2135 char *e;
2136 int err = 0;
2137 unsigned long long size = simple_strtoull(buf, &e, 10);
2138 if (!*buf || *buf == '\n' ||
2139 (*e && *e != '\n'))
2140 return -EINVAL;
2141
2142 if (mddev->pers) {
2143 err = update_size(mddev, size);
2144 md_update_sb(mddev);
2145 } else {
2146 if (mddev->size == 0 ||
2147 mddev->size > size)
2148 mddev->size = size;
2149 else
2150 err = -ENOSPC;
2151 }
2152 return err ? err : len;
2153}
2154
2155static struct md_sysfs_entry md_size =
2156__ATTR(component_size, 0644, size_show, size_store);
2157
8bb93aac
N		 2158
2159/* Metdata version.
2160 * This is either 'none' for arrays with externally managed metadata,
2161 * or N.M for internally known formats
2162 */
2163static ssize_t
2164metadata_show(mddev_t *mddev, char *page)
2165{
2166 if (mddev->persistent)
2167 return sprintf(page, "%d.%d\n",
2168 mddev->major_version, mddev->minor_version);
2169 else
2170 return sprintf(page, "none\n");
2171}
2172
2173static ssize_t
2174metadata_store(mddev_t *mddev, const char *buf, size_t len)
2175{
2176 int major, minor;
2177 char *e;
2178 if (!list_empty(&mddev->disks))
2179 return -EBUSY;
2180
2181 if (cmd_match(buf, "none")) {
2182 mddev->persistent = 0;
2183 mddev->major_version = 0;
2184 mddev->minor_version = 90;
2185 return len;
2186 }
2187 major = simple_strtoul(buf, &e, 10);
2188 if (e==buf || *e != '.')
2189 return -EINVAL;
2190 buf = e+1;
2191 minor = simple_strtoul(buf, &e, 10);
2192 if (e==buf || *e != '\n')
2193 return -EINVAL;
2194 if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
2195 super_types[major].name == NULL)
2196 return -ENOENT;
2197 mddev->major_version = major;
2198 mddev->minor_version = minor;
2199 mddev->persistent = 1;
2200 return len;
2201}
2202
2203static struct md_sysfs_entry md_metadata =
2204__ATTR(metadata_version, 0644, metadata_show, metadata_store);
2205
24dd469d 2206static ssize_t
7eec314d 2207action_show(mddev_t *mddev, char *page)
24dd469d 2208{
7eec314d 2209 char *type = "idle";
31399d9e
N		 2210 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2211 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
ccfcc3c1
N		 2212 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2213 type = "reshape";
2214 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N		 2215 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2216 type = "resync";
2217 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2218 type = "check";
2219 else
2220 type = "repair";
2221 } else
2222 type = "recover";
2223 }
2224 return sprintf(page, "%s\n", type);
2225}
2226
2227static ssize_t
7eec314d 2228action_store(mddev_t *mddev, const char *page, size_t len)
24dd469d 2229{
7eec314d
N		 2230 if (!mddev->pers || !mddev->pers->sync_request)
2231 return -EINVAL;
2232
bce74dac 2233 if (cmd_match(page, "idle")) {
7eec314d
N		 2234 if (mddev->sync_thread) {
2235 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2236 md_unregister_thread(mddev->sync_thread);
2237 mddev->sync_thread = NULL;
2238 mddev->recovery = 0;
2239 }
03c902e1
N		 2240 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2241 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 2242 return -EBUSY;
03c902e1 2243 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
7eec314d 2244 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
16484bf5
N		 2245 else if (cmd_match(page, "reshape")) {
2246 int err;
2247 if (mddev->pers->start_reshape == NULL)
2248 return -EINVAL;
2249 err = mddev->pers->start_reshape(mddev);
2250 if (err)
2251 return err;
2252 } else {
bce74dac 2253 if (cmd_match(page, "check"))
7eec314d 2254 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2adc7d47 2255 else if (!cmd_match(page, "repair"))
7eec314d
N		 2256 return -EINVAL;
2257 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2258 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7eec314d 2259 }
03c902e1 2260 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d
N		 2261 md_wakeup_thread(mddev->thread);
2262 return len;
2263}
2264
9d88883e 2265static ssize_t
96de1e66 2266mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 2267{
2268 return sprintf(page, "%llu\n",
2269 (unsigned long long) mddev->resync_mismatches);
2270}
2271
96de1e66 2272static struct md_sysfs_entry
7eec314d 2273md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 2274
96de1e66
N		 2275
2276static struct md_sysfs_entry
2277md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 2278
88202a0c
N		 2279static ssize_t
2280sync_min_show(mddev_t *mddev, char *page)
2281{
2282 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2283 mddev->sync_speed_min ? "local": "system");
2284}
2285
2286static ssize_t
2287sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2288{
2289 int min;
2290 char *e;
2291 if (strncmp(buf, "system", 6)==0) {
2292 mddev->sync_speed_min = 0;
2293 return len;
2294 }
2295 min = simple_strtoul(buf, &e, 10);
2296 if (buf == e || (*e && *e != '\n') || min <= 0)
2297 return -EINVAL;
2298 mddev->sync_speed_min = min;
2299 return len;
2300}
2301
2302static struct md_sysfs_entry md_sync_min =
2303__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2304
2305static ssize_t
2306sync_max_show(mddev_t *mddev, char *page)
2307{
2308 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2309 mddev->sync_speed_max ? "local": "system");
2310}
2311
2312static ssize_t
2313sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2314{
2315 int max;
2316 char *e;
2317 if (strncmp(buf, "system", 6)==0) {
2318 mddev->sync_speed_max = 0;
2319 return len;
2320 }
2321 max = simple_strtoul(buf, &e, 10);
2322 if (buf == e || (*e && *e != '\n') || max <= 0)
2323 return -EINVAL;
2324 mddev->sync_speed_max = max;
2325 return len;
2326}
2327
2328static struct md_sysfs_entry md_sync_max =
2329__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2330
2331
2332static ssize_t
2333sync_speed_show(mddev_t *mddev, char *page)
2334{
2335 unsigned long resync, dt, db;
2336 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2337 dt = ((jiffies - mddev->resync_mark) / HZ);
2338 if (!dt) dt++;
2339 db = resync - (mddev->resync_mark_cnt);
2340 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2341}
2342
2343static struct md_sysfs_entry
2344md_sync_speed = __ATTR_RO(sync_speed);
2345
2346static ssize_t
2347sync_completed_show(mddev_t *mddev, char *page)
2348{
2349 unsigned long max_blocks, resync;
2350
2351 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2352 max_blocks = mddev->resync_max_sectors;
2353 else
2354 max_blocks = mddev->size << 1;
2355
2356 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2357 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2358}
2359
2360static struct md_sysfs_entry
2361md_sync_completed = __ATTR_RO(sync_completed);
2362
e464eafd
N		 2363static ssize_t
2364suspend_lo_show(mddev_t *mddev, char *page)
2365{
2366 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
2367}
2368
2369static ssize_t
2370suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
2371{
2372 char *e;
2373 unsigned long long new = simple_strtoull(buf, &e, 10);
2374
2375 if (mddev->pers->quiesce == NULL)
2376 return -EINVAL;
2377 if (buf == e || (*e && *e != '\n'))
2378 return -EINVAL;
2379 if (new >= mddev->suspend_hi ||
2380 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
2381 mddev->suspend_lo = new;
2382 mddev->pers->quiesce(mddev, 2);
2383 return len;
2384 } else
2385 return -EINVAL;
2386}
2387static struct md_sysfs_entry md_suspend_lo =
2388__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
2389
2390
2391static ssize_t
2392suspend_hi_show(mddev_t *mddev, char *page)
2393{
2394 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
2395}
2396
2397static ssize_t
2398suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
2399{
2400 char *e;
2401 unsigned long long new = simple_strtoull(buf, &e, 10);
2402
2403 if (mddev->pers->quiesce == NULL)
2404 return -EINVAL;
2405 if (buf == e || (*e && *e != '\n'))
2406 return -EINVAL;
2407 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
2408 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
2409 mddev->suspend_hi = new;
2410 mddev->pers->quiesce(mddev, 1);
2411 mddev->pers->quiesce(mddev, 0);
2412 return len;
2413 } else
2414 return -EINVAL;
2415}
2416static struct md_sysfs_entry md_suspend_hi =
2417__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
2418
2419
eae1701f
N		 2420static struct attribute *md_default_attrs[] = {
2421 &md_level.attr,
2422 &md_raid_disks.attr,
3b34380a 2423 &md_chunk_size.attr,
a35b0d69 2424 &md_size.attr,
8bb93aac 2425 &md_metadata.attr,
6d7ff738 2426 &md_new_device.attr,
411036fa
N		 2427 NULL,
2428};
2429
2430static struct attribute *md_redundancy_attrs[] = {
24dd469d 2431 &md_scan_mode.attr,
9d88883e 2432 &md_mismatches.attr,
88202a0c
N		 2433 &md_sync_min.attr,
2434 &md_sync_max.attr,
2435 &md_sync_speed.attr,
2436 &md_sync_completed.attr,
e464eafd
N		 2437 &md_suspend_lo.attr,
2438 &md_suspend_hi.attr,
eae1701f
N		 2439 NULL,
2440};
411036fa
N		 2441static struct attribute_group md_redundancy_group = {
2442 .name = NULL,
2443 .attrs = md_redundancy_attrs,
2444};
2445
eae1701f
N		 2446
2447static ssize_t
2448md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2449{
2450 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2451 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2452 ssize_t rv;
eae1701f
N		 2453
2454 if (!entry->show)
2455 return -EIO;
5dc5cf7d
IM		 2456 rv = mddev_lock(mddev);
2457 if (!rv) {
2458 rv = entry->show(mddev, page);
2459 mddev_unlock(mddev);
2460 }
96de1e66 2461 return rv;
eae1701f
N		 2462}
2463
2464static ssize_t
2465md_attr_store(struct kobject *kobj, struct attribute *attr,
2466 const char *page, size_t length)
2467{
2468 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2469 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2470 ssize_t rv;
eae1701f
N		 2471
2472 if (!entry->store)
2473 return -EIO;
5dc5cf7d
IM		 2474 rv = mddev_lock(mddev);
2475 if (!rv) {
2476 rv = entry->store(mddev, page, length);
2477 mddev_unlock(mddev);
2478 }
96de1e66 2479 return rv;
eae1701f
N		 2480}
2481
2482static void md_free(struct kobject *ko)
2483{
2484 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2485 kfree(mddev);
2486}
2487
2488static struct sysfs_ops md_sysfs_ops = {
2489 .show = md_attr_show,
2490 .store = md_attr_store,
2491};
2492static struct kobj_type md_ktype = {
2493 .release = md_free,
2494 .sysfs_ops = &md_sysfs_ops,
2495 .default_attrs = md_default_attrs,
2496};
2497
1da177e4
LT		 2498int mdp_major = 0;
2499
2500static struct kobject *md_probe(dev_t dev, int *part, void *data)
2501{
48c9c27b 2502 static DEFINE_MUTEX(disks_mutex);
1da177e4
LT		 2503 mddev_t *mddev = mddev_find(dev);
2504 struct gendisk *disk;
2505 int partitioned = (MAJOR(dev) != MD_MAJOR);
2506 int shift = partitioned ? MdpMinorShift : 0;
2507 int unit = MINOR(dev) >> shift;
2508
2509 if (!mddev)
2510 return NULL;
2511
48c9c27b 2512 mutex_lock(&disks_mutex);
1da177e4 2513 if (mddev->gendisk) {
48c9c27b 2514 mutex_unlock(&disks_mutex);
1da177e4
LT		 2515 mddev_put(mddev);
2516 return NULL;
2517 }
2518 disk = alloc_disk(1 << shift);
2519 if (!disk) {
48c9c27b 2520 mutex_unlock(&disks_mutex);
1da177e4
LT		 2521 mddev_put(mddev);
2522 return NULL;
2523 }
2524 disk->major = MAJOR(dev);
2525 disk->first_minor = unit << shift;
2526 if (partitioned) {
2527 sprintf(disk->disk_name, "md_d%d", unit);
2528 sprintf(disk->devfs_name, "md/d%d", unit);
2529 } else {
2530 sprintf(disk->disk_name, "md%d", unit);
2531 sprintf(disk->devfs_name, "md/%d", unit);
2532 }
2533 disk->fops = &md_fops;
2534 disk->private_data = mddev;
2535 disk->queue = mddev->queue;
2536 add_disk(disk);
2537 mddev->gendisk = disk;
48c9c27b 2538 mutex_unlock(&disks_mutex);
9c791977 2539 mddev->kobj.parent = &disk->kobj;
eae1701f
N		 2540 mddev->kobj.k_name = NULL;
2541 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
2542 mddev->kobj.ktype = &md_ktype;
2543 kobject_register(&mddev->kobj);
1da177e4
LT		 2544 return NULL;
2545}
2546
2547void md_wakeup_thread(mdk_thread_t *thread);
2548
2549static void md_safemode_timeout(unsigned long data)
2550{
2551 mddev_t *mddev = (mddev_t *) data;
2552
2553 mddev->safemode = 1;
2554 md_wakeup_thread(mddev->thread);
2555}
2556
6ff8d8ec 2557static int start_dirty_degraded;
1da177e4
LT		 2558
2559static int do_md_run(mddev_t * mddev)
2560{
2604b703 2561 int err;
1da177e4
LT		 2562 int chunk_size;
2563 struct list_head *tmp;
2564 mdk_rdev_t *rdev;
2565 struct gendisk *disk;
2604b703 2566 struct mdk_personality *pers;
1da177e4
LT		 2567 char b[BDEVNAME_SIZE];
2568
a757e64c
N		 2569 if (list_empty(&mddev->disks))
2570 /* cannot run an array with no devices.. */
1da177e4 2571 return -EINVAL;
1da177e4
LT		 2572
2573 if (mddev->pers)
2574 return -EBUSY;
2575
2576 /*
2577 * Analyze all RAID superblock(s)
2578 */
a757e64c
N		 2579 if (!mddev->raid_disks)
2580 analyze_sbs(mddev);
1da177e4
LT		 2581
2582 chunk_size = mddev->chunk_size;
2604b703
N		 2583
2584 if (chunk_size) {
1da177e4
LT		 2585 if (chunk_size > MAX_CHUNK_SIZE) {
2586 printk(KERN_ERR "too big chunk_size: %d > %d\n",
2587 chunk_size, MAX_CHUNK_SIZE);
2588 return -EINVAL;
2589 }
2590 /*
2591 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2592 */
2593 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 2594 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 2595 return -EINVAL;
2596 }
2597 if (chunk_size < PAGE_SIZE) {
2598 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
2599 chunk_size, PAGE_SIZE);
2600 return -EINVAL;
2601 }
2602
2603 /* devices must have minimum size of one chunk */
2604 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2605 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2606 continue;
2607 if (rdev->size < chunk_size / 1024) {
2608 printk(KERN_WARNING
2609 "md: Dev %s smaller than chunk_size:"
2610 " %lluk < %dk\n",
2611 bdevname(rdev->bdev,b),
2612 (unsigned long long)rdev->size,
2613 chunk_size / 1024);
2614 return -EINVAL;
2615 }
2616 }
2617 }
2618
1da177e4 2619#ifdef CONFIG_KMOD
d9d166c2
N		 2620 if (mddev->level != LEVEL_NONE)
2621 request_module("md-level-%d", mddev->level);
2622 else if (mddev->clevel[0])
2623 request_module("md-%s", mddev->clevel);
1da177e4
LT		 2624#endif
2625
2626 /*
2627 * Drop all container device buffers, from now on
2628 * the only valid external interface is through the md
2629 * device.
2630 * Also find largest hardsector size
2631 */
2632 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2633 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2634 continue;
2635 sync_blockdev(rdev->bdev);
2636 invalidate_bdev(rdev->bdev, 0);
2637 }
2638
2639 md_probe(mddev->unit, NULL, NULL);
2640 disk = mddev->gendisk;
2641 if (!disk)
2642 return -ENOMEM;
2643
2644 spin_lock(&pers_lock);
d9d166c2 2645 pers = find_pers(mddev->level, mddev->clevel);
2604b703 2646 if (!pers || !try_module_get(pers->owner)) {
1da177e4 2647 spin_unlock(&pers_lock);
d9d166c2
N		 2648 if (mddev->level != LEVEL_NONE)
2649 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
2650 mddev->level);
2651 else
2652 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
2653 mddev->clevel);
1da177e4
LT		 2654 return -EINVAL;
2655 }
2604b703 2656 mddev->pers = pers;
1da177e4 2657 spin_unlock(&pers_lock);
d9d166c2
N		 2658 mddev->level = pers->level;
2659 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
1da177e4 2660
f6705578 2661 if (mddev->reshape_position != MaxSector &&
63c70c4f 2662 pers->start_reshape == NULL) {
f6705578
N		 2663 /* This personality cannot handle reshaping... */
2664 mddev->pers = NULL;
2665 module_put(pers->owner);
2666 return -EINVAL;
2667 }
2668
657390d2 2669 mddev->recovery = 0;
1da177e4 2670 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 2671 mddev->barriers_work = 1;
6ff8d8ec 2672 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 2673
f91de92e
N		 2674 if (start_readonly)
2675 mddev->ro = 2; /* read-only, but switch on first write */
2676
b15c2e57
N		 2677 err = mddev->pers->run(mddev);
2678 if (!err && mddev->pers->sync_request) {
2679 err = bitmap_create(mddev);
2680 if (err) {
2681 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
2682 mdname(mddev), err);
2683 mddev->pers->stop(mddev);
2684 }
2685 }
1da177e4
LT		 2686 if (err) {
2687 printk(KERN_ERR "md: pers->run() failed ...\n");
2688 module_put(mddev->pers->owner);
2689 mddev->pers = NULL;
32a7627c
N		 2690 bitmap_destroy(mddev);
2691 return err;
1da177e4 2692 }
411036fa
N		 2693 if (mddev->pers->sync_request)
2694 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
fd9d49ca
N		 2695 else if (mddev->ro == 2) /* auto-readonly not meaningful */
2696 mddev->ro = 0;
2697
1da177e4
LT		 2698 atomic_set(&mddev->writes_pending,0);
2699 mddev->safemode = 0;
2700 mddev->safemode_timer.function = md_safemode_timeout;
2701 mddev->safemode_timer.data = (unsigned long) mddev;
2702 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */
2703 mddev->in_sync = 1;
86e6ffdd
N		 2704
2705 ITERATE_RDEV(mddev,rdev,tmp)
2706 if (rdev->raid_disk >= 0) {
2707 char nm[20];
2708 sprintf(nm, "rd%d", rdev->raid_disk);
2709 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2710 }
1da177e4
LT		 2711
2712 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 2713 md_wakeup_thread(mddev->thread);
1da177e4
LT		 2714
2715 if (mddev->sb_dirty)
2716 md_update_sb(mddev);
2717
2718 set_capacity(disk, mddev->array_size<<1);
2719
2720 /* If we call blk_queue_make_request here, it will
2721 * re-initialise max_sectors etc which may have been
2722 * refined inside -> run. So just set the bits we need to set.
2723 * Most initialisation happended when we called
2724 * blk_queue_make_request(..., md_fail_request)
2725 * earlier.
2726 */
2727 mddev->queue->queuedata = mddev;
2728 mddev->queue->make_request_fn = mddev->pers->make_request;
2729
2730 mddev->changed = 1;
d7603b7e 2731 md_new_event(mddev);
1da177e4
LT		 2732 return 0;
2733}
2734
2735static int restart_array(mddev_t *mddev)
2736{
2737 struct gendisk *disk = mddev->gendisk;
2738 int err;
2739
2740 /*
2741 * Complain if it has no devices
2742 */
2743 err = -ENXIO;
2744 if (list_empty(&mddev->disks))
2745 goto out;
2746
2747 if (mddev->pers) {
2748 err = -EBUSY;
2749 if (!mddev->ro)
2750 goto out;
2751
2752 mddev->safemode = 0;
2753 mddev->ro = 0;
2754 set_disk_ro(disk, 0);
2755
2756 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2757 mdname(mddev));
2758 /*
2759 * Kick recovery or resync if necessary
2760 */
2761 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2762 md_wakeup_thread(mddev->thread);
2763 err = 0;
2764 } else {
2765 printk(KERN_ERR "md: %s has no personality assigned.\n",
2766 mdname(mddev));
2767 err = -EINVAL;
2768 }
2769
2770out:
2771 return err;
2772}
2773
2774static int do_md_stop(mddev_t * mddev, int ro)
2775{
2776 int err = 0;
2777 struct gendisk *disk = mddev->gendisk;
2778
2779 if (mddev->pers) {
2780 if (atomic_read(&mddev->active)>2) {
2781 printk("md: %s still in use.\n",mdname(mddev));
2782 return -EBUSY;
2783 }
2784
2785 if (mddev->sync_thread) {
2786 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2787 md_unregister_thread(mddev->sync_thread);
2788 mddev->sync_thread = NULL;
2789 }
2790
2791 del_timer_sync(&mddev->safemode_timer);
2792
2793 invalidate_partition(disk, 0);
2794
2795 if (ro) {
2796 err = -ENXIO;
f91de92e 2797 if (mddev->ro==1)
1da177e4
LT		 2798 goto out;
2799 mddev->ro = 1;
2800 } else {
6b8b3e8a 2801 bitmap_flush(mddev);
a9701a30 2802 md_super_wait(mddev);
1da177e4
LT		 2803 if (mddev->ro)
2804 set_disk_ro(disk, 0);
2805 blk_queue_make_request(mddev->queue, md_fail_request);
2806 mddev->pers->stop(mddev);
411036fa
N		 2807 if (mddev->pers->sync_request)
2808 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
2809
1da177e4
LT		 2810 module_put(mddev->pers->owner);
2811 mddev->pers = NULL;
2812 if (mddev->ro)
2813 mddev->ro = 0;
2814 }
2815 if (!mddev->in_sync) {
2816 /* mark array as shutdown cleanly */
2817 mddev->in_sync = 1;
2818 md_update_sb(mddev);
2819 }
2820 if (ro)
2821 set_disk_ro(disk, 1);
2822 }
32a7627c 2823
1da177e4
LT		 2824 /*
2825 * Free resources if final stop
2826 */
2827 if (!ro) {
86e6ffdd
N		 2828 mdk_rdev_t *rdev;
2829 struct list_head *tmp;
1da177e4
LT		 2830 struct gendisk *disk;
2831 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
2832
978f946b
N		 2833 bitmap_destroy(mddev);
2834 if (mddev->bitmap_file) {
2835 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
2836 fput(mddev->bitmap_file);
2837 mddev->bitmap_file = NULL;
2838 }
2839 mddev->bitmap_offset = 0;
2840
86e6ffdd
N		 2841 ITERATE_RDEV(mddev,rdev,tmp)
2842 if (rdev->raid_disk >= 0) {
2843 char nm[20];
2844 sprintf(nm, "rd%d", rdev->raid_disk);
2845 sysfs_remove_link(&mddev->kobj, nm);
2846 }
2847
1da177e4
LT		 2848 export_array(mddev);
2849
2850 mddev->array_size = 0;
2851 disk = mddev->gendisk;
2852 if (disk)
2853 set_capacity(disk, 0);
2854 mddev->changed = 1;
2855 } else
2856 printk(KERN_INFO "md: %s switched to read-only mode.\n",
2857 mdname(mddev));
2858 err = 0;
d7603b7e 2859 md_new_event(mddev);
1da177e4
LT		 2860out:
2861 return err;
2862}
2863
2864static void autorun_array(mddev_t *mddev)
2865{
2866 mdk_rdev_t *rdev;
2867 struct list_head *tmp;
2868 int err;
2869
a757e64c 2870 if (list_empty(&mddev->disks))
1da177e4 2871 return;
1da177e4
LT		 2872
2873 printk(KERN_INFO "md: running: ");
2874
2875 ITERATE_RDEV(mddev,rdev,tmp) {
2876 char b[BDEVNAME_SIZE];
2877 printk("<%s>", bdevname(rdev->bdev,b));
2878 }
2879 printk("\n");
2880
2881 err = do_md_run (mddev);
2882 if (err) {
2883 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
2884 do_md_stop (mddev, 0);
2885 }
2886}
2887
2888/*
2889 * lets try to run arrays based on all disks that have arrived
2890 * until now. (those are in pending_raid_disks)
2891 *
2892 * the method: pick the first pending disk, collect all disks with
2893 * the same UUID, remove all from the pending list and put them into
2894 * the 'same_array' list. Then order this list based on superblock
2895 * update time (freshest comes first), kick out 'old' disks and
2896 * compare superblocks. If everything's fine then run it.
2897 *
2898 * If "unit" is allocated, then bump its reference count
2899 */
2900static void autorun_devices(int part)
2901{
1da177e4
LT		 2902 struct list_head *tmp;
2903 mdk_rdev_t *rdev0, *rdev;
2904 mddev_t *mddev;
2905 char b[BDEVNAME_SIZE];
2906
2907 printk(KERN_INFO "md: autorun ...\n");
2908 while (!list_empty(&pending_raid_disks)) {
2909 dev_t dev;
ad01c9e3 2910 LIST_HEAD(candidates);
1da177e4
LT		 2911 rdev0 = list_entry(pending_raid_disks.next,
2912 mdk_rdev_t, same_set);
2913
2914 printk(KERN_INFO "md: considering %s ...\n",
2915 bdevname(rdev0->bdev,b));
2916 INIT_LIST_HEAD(&candidates);
2917 ITERATE_RDEV_PENDING(rdev,tmp)
2918 if (super_90_load(rdev, rdev0, 0) >= 0) {
2919 printk(KERN_INFO "md: adding %s ...\n",
2920 bdevname(rdev->bdev,b));
2921 list_move(&rdev->same_set, &candidates);
2922 }
2923 /*
2924 * now we have a set of devices, with all of them having
2925 * mostly sane superblocks. It's time to allocate the
2926 * mddev.
2927 */
2928 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
2929 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
2930 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
2931 break;
2932 }
2933 if (part)
2934 dev = MKDEV(mdp_major,
2935 rdev0->preferred_minor << MdpMinorShift);
2936 else
2937 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
2938
2939 md_probe(dev, NULL, NULL);
2940 mddev = mddev_find(dev);
2941 if (!mddev) {
2942 printk(KERN_ERR
2943 "md: cannot allocate memory for md drive.\n");
2944 break;
2945 }
2946 if (mddev_lock(mddev))
2947 printk(KERN_WARNING "md: %s locked, cannot run\n",
2948 mdname(mddev));
2949 else if (mddev->raid_disks || mddev->major_version
2950 || !list_empty(&mddev->disks)) {
2951 printk(KERN_WARNING
2952 "md: %s already running, cannot run %s\n",
2953 mdname(mddev), bdevname(rdev0->bdev,b));
2954 mddev_unlock(mddev);
2955 } else {
2956 printk(KERN_INFO "md: created %s\n", mdname(mddev));
2957 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
2958 list_del_init(&rdev->same_set);
2959 if (bind_rdev_to_array(rdev, mddev))
2960 export_rdev(rdev);
2961 }
2962 autorun_array(mddev);
2963 mddev_unlock(mddev);
2964 }
2965 /* on success, candidates will be empty, on error
2966 * it won't...
2967 */
2968 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
2969 export_rdev(rdev);
2970 mddev_put(mddev);
2971 }
2972 printk(KERN_INFO "md: ... autorun DONE.\n");
2973}
2974
2975/*
2976 * import RAID devices based on one partition
2977 * if possible, the array gets run as well.
2978 */
2979
2980static int autostart_array(dev_t startdev)
2981{
2982 char b[BDEVNAME_SIZE];
2983 int err = -EINVAL, i;
2984 mdp_super_t *sb = NULL;
2985 mdk_rdev_t *start_rdev = NULL, *rdev;
2986
2987 start_rdev = md_import_device(startdev, 0, 0);
2988 if (IS_ERR(start_rdev))
2989 return err;
2990
2991
2992 /* NOTE: this can only work for 0.90.0 superblocks */
2993 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
2994 if (sb->major_version != 0 ||
2995 sb->minor_version != 90 ) {
2996 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
2997 export_rdev(start_rdev);
2998 return err;
2999 }
3000
b2d444d7 3001 if (test_bit(Faulty, &start_rdev->flags)) {
1da177e4
LT		 3002 printk(KERN_WARNING
3003 "md: can not autostart based on faulty %s!\n",
3004 bdevname(start_rdev->bdev,b));
3005 export_rdev(start_rdev);
3006 return err;
3007 }
3008 list_add(&start_rdev->same_set, &pending_raid_disks);
3009
3010 for (i = 0; i < MD_SB_DISKS; i++) {
3011 mdp_disk_t *desc = sb->disks + i;
3012 dev_t dev = MKDEV(desc->major, desc->minor);
3013
3014 if (!dev)
3015 continue;
3016 if (dev == startdev)
3017 continue;
3018 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
3019 continue;
3020 rdev = md_import_device(dev, 0, 0);
3021 if (IS_ERR(rdev))
3022 continue;
3023
3024 list_add(&rdev->same_set, &pending_raid_disks);
3025 }
3026
3027 /*
3028 * possibly return codes
3029 */
3030 autorun_devices(0);
3031 return 0;
3032
3033}
3034
3035
3036static int get_version(void __user * arg)
3037{
3038 mdu_version_t ver;
3039
3040 ver.major = MD_MAJOR_VERSION;
3041 ver.minor = MD_MINOR_VERSION;
3042 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3043
3044 if (copy_to_user(arg, &ver, sizeof(ver)))
3045 return -EFAULT;
3046
3047 return 0;
3048}
3049
3050static int get_array_info(mddev_t * mddev, void __user * arg)
3051{
3052 mdu_array_info_t info;
3053 int nr,working,active,failed,spare;
3054 mdk_rdev_t *rdev;
3055 struct list_head *tmp;
3056
3057 nr=working=active=failed=spare=0;
3058 ITERATE_RDEV(mddev,rdev,tmp) {
3059 nr++;
b2d444d7 3060 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 3061 failed++;
3062 else {
3063 working++;
b2d444d7 3064 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 3065 active++;
3066 else
3067 spare++;
3068 }
3069 }
3070
3071 info.major_version = mddev->major_version;
3072 info.minor_version = mddev->minor_version;
3073 info.patch_version = MD_PATCHLEVEL_VERSION;
3074 info.ctime = mddev->ctime;
3075 info.level = mddev->level;
3076 info.size = mddev->size;
284ae7ca
N		 3077 if (info.size != mddev->size) /* overflow */
3078 info.size = -1;
1da177e4
LT		 3079 info.nr_disks = nr;
3080 info.raid_disks = mddev->raid_disks;
3081 info.md_minor = mddev->md_minor;
3082 info.not_persistent= !mddev->persistent;
3083
3084 info.utime = mddev->utime;
3085 info.state = 0;
3086 if (mddev->in_sync)
3087 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 3088 if (mddev->bitmap && mddev->bitmap_offset)
3089 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 3090 info.active_disks = active;
3091 info.working_disks = working;
3092 info.failed_disks = failed;
3093 info.spare_disks = spare;
3094
3095 info.layout = mddev->layout;
3096 info.chunk_size = mddev->chunk_size;
3097
3098 if (copy_to_user(arg, &info, sizeof(info)))
3099 return -EFAULT;
3100
3101 return 0;
3102}
3103
87162a28 3104static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 3105{
3106 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3107 char *ptr, *buf = NULL;
3108 int err = -ENOMEM;
3109
3110 file = kmalloc(sizeof(*file), GFP_KERNEL);
3111 if (!file)
3112 goto out;
3113
3114 /* bitmap disabled, zero the first byte and copy out */
3115 if (!mddev->bitmap || !mddev->bitmap->file) {
3116 file->pathname[0] = '\0';
3117 goto copy_out;
3118 }
3119
3120 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3121 if (!buf)
3122 goto out;
3123
3124 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3125 if (!ptr)
3126 goto out;
3127
3128 strcpy(file->pathname, ptr);
3129
3130copy_out:
3131 err = 0;
3132 if (copy_to_user(arg, file, sizeof(*file)))
3133 err = -EFAULT;
3134out:
3135 kfree(buf);
3136 kfree(file);
3137 return err;
3138}
3139
1da177e4
LT		 3140static int get_disk_info(mddev_t * mddev, void __user * arg)
3141{
3142 mdu_disk_info_t info;
3143 unsigned int nr;
3144 mdk_rdev_t *rdev;
3145
3146 if (copy_from_user(&info, arg, sizeof(info)))
3147 return -EFAULT;
3148
3149 nr = info.number;
3150
3151 rdev = find_rdev_nr(mddev, nr);
3152 if (rdev) {
3153 info.major = MAJOR(rdev->bdev->bd_dev);
3154 info.minor = MINOR(rdev->bdev->bd_dev);
3155 info.raid_disk = rdev->raid_disk;
3156 info.state = 0;
b2d444d7 3157 if (test_bit(Faulty, &rdev->flags))
1da177e4 3158 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 3159 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 3160 info.state |= (1<<MD_DISK_ACTIVE);
3161 info.state |= (1<<MD_DISK_SYNC);
3162 }
8ddf9efe
N		 3163 if (test_bit(WriteMostly, &rdev->flags))
3164 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 3165 } else {
3166 info.major = info.minor = 0;
3167 info.raid_disk = -1;
3168 info.state = (1<<MD_DISK_REMOVED);
3169 }
3170
3171 if (copy_to_user(arg, &info, sizeof(info)))
3172 return -EFAULT;
3173
3174 return 0;
3175}
3176
3177static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3178{
3179 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3180 mdk_rdev_t *rdev;
3181 dev_t dev = MKDEV(info->major,info->minor);
3182
3183 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3184 return -EOVERFLOW;
3185
3186 if (!mddev->raid_disks) {
3187 int err;
3188 /* expecting a device which has a superblock */
3189 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3190 if (IS_ERR(rdev)) {
3191 printk(KERN_WARNING
3192 "md: md_import_device returned %ld\n",
3193 PTR_ERR(rdev));
3194 return PTR_ERR(rdev);
3195 }
3196 if (!list_empty(&mddev->disks)) {
3197 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3198 mdk_rdev_t, same_set);
3199 int err = super_types[mddev->major_version]
3200 .load_super(rdev, rdev0, mddev->minor_version);
3201 if (err < 0) {
3202 printk(KERN_WARNING
3203 "md: %s has different UUID to %s\n",
3204 bdevname(rdev->bdev,b),
3205 bdevname(rdev0->bdev,b2));
3206 export_rdev(rdev);
3207 return -EINVAL;
3208 }
3209 }
3210 err = bind_rdev_to_array(rdev, mddev);
3211 if (err)
3212 export_rdev(rdev);
3213 return err;
3214 }
3215
3216 /*
3217 * add_new_disk can be used once the array is assembled
3218 * to add "hot spares". They must already have a superblock
3219 * written
3220 */
3221 if (mddev->pers) {
3222 int err;
3223 if (!mddev->pers->hot_add_disk) {
3224 printk(KERN_WARNING
3225 "%s: personality does not support diskops!\n",
3226 mdname(mddev));
3227 return -EINVAL;
3228 }
7b1e35f6
N		 3229 if (mddev->persistent)
3230 rdev = md_import_device(dev, mddev->major_version,
3231 mddev->minor_version);
3232 else
3233 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 3234 if (IS_ERR(rdev)) {
3235 printk(KERN_WARNING
3236 "md: md_import_device returned %ld\n",
3237 PTR_ERR(rdev));
3238 return PTR_ERR(rdev);
3239 }
41158c7e
N		 3240 /* set save_raid_disk if appropriate */
3241 if (!mddev->persistent) {
3242 if (info->state & (1<<MD_DISK_SYNC) &&
3243 info->raid_disk < mddev->raid_disks)
3244 rdev->raid_disk = info->raid_disk;
3245 else
3246 rdev->raid_disk = -1;
3247 } else
3248 super_types[mddev->major_version].
3249 validate_super(mddev, rdev);
3250 rdev->saved_raid_disk = rdev->raid_disk;
3251
b2d444d7 3252 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 3253 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3254 set_bit(WriteMostly, &rdev->flags);
3255
1da177e4
LT		 3256 rdev->raid_disk = -1;
3257 err = bind_rdev_to_array(rdev, mddev);
3258 if (err)
3259 export_rdev(rdev);
c361777f
N		 3260
3261 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 3262 md_wakeup_thread(mddev->thread);
1da177e4
LT		 3263 return err;
3264 }
3265
3266 /* otherwise, add_new_disk is only allowed
3267 * for major_version==0 superblocks
3268 */
3269 if (mddev->major_version != 0) {
3270 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3271 mdname(mddev));
3272 return -EINVAL;
3273 }
3274
3275 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3276 int err;
3277 rdev = md_import_device (dev, -1, 0);
3278 if (IS_ERR(rdev)) {
3279 printk(KERN_WARNING
3280 "md: error, md_import_device() returned %ld\n",
3281 PTR_ERR(rdev));
3282 return PTR_ERR(rdev);
3283 }
3284 rdev->desc_nr = info->number;
3285 if (info->raid_disk < mddev->raid_disks)
3286 rdev->raid_disk = info->raid_disk;
3287 else
3288 rdev->raid_disk = -1;
3289
b2d444d7
N		 3290 rdev->flags = 0;
3291
1da177e4 3292 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 3293 if (info->state & (1<<MD_DISK_SYNC))
3294 set_bit(In_sync, &rdev->flags);
1da177e4 3295
8ddf9efe
N		 3296 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3297 set_bit(WriteMostly, &rdev->flags);
3298
1da177e4
LT		 3299 if (!mddev->persistent) {
3300 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3301 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3302 } else
3303 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3304 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3305
2bf071bf
N		 3306 err = bind_rdev_to_array(rdev, mddev);
3307 if (err) {
3308 export_rdev(rdev);
3309 return err;
3310 }
1da177e4
LT		 3311 }
3312
3313 return 0;
3314}
3315
3316static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3317{
3318 char b[BDEVNAME_SIZE];
3319 mdk_rdev_t *rdev;
3320
3321 if (!mddev->pers)
3322 return -ENODEV;
3323
3324 rdev = find_rdev(mddev, dev);
3325 if (!rdev)
3326 return -ENXIO;
3327
3328 if (rdev->raid_disk >= 0)
3329 goto busy;
3330
3331 kick_rdev_from_array(rdev);
3332 md_update_sb(mddev);
d7603b7e 3333 md_new_event(mddev);
1da177e4
LT		 3334
3335 return 0;
3336busy:
3337 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3338 bdevname(rdev->bdev,b), mdname(mddev));
3339 return -EBUSY;
3340}
3341
3342static int hot_add_disk(mddev_t * mddev, dev_t dev)
3343{
3344 char b[BDEVNAME_SIZE];
3345 int err;
3346 unsigned int size;
3347 mdk_rdev_t *rdev;
3348
3349 if (!mddev->pers)
3350 return -ENODEV;
3351
3352 if (mddev->major_version != 0) {
3353 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3354 " version-0 superblocks.\n",
3355 mdname(mddev));
3356 return -EINVAL;
3357 }
3358 if (!mddev->pers->hot_add_disk) {
3359 printk(KERN_WARNING
3360 "%s: personality does not support diskops!\n",
3361 mdname(mddev));
3362 return -EINVAL;
3363 }
3364
3365 rdev = md_import_device (dev, -1, 0);
3366 if (IS_ERR(rdev)) {
3367 printk(KERN_WARNING
3368 "md: error, md_import_device() returned %ld\n",
3369 PTR_ERR(rdev));
3370 return -EINVAL;
3371 }
3372
3373 if (mddev->persistent)
3374 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3375 else
3376 rdev->sb_offset =
3377 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3378
3379 size = calc_dev_size(rdev, mddev->chunk_size);
3380 rdev->size = size;
3381
b2d444d7 3382 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 3383 printk(KERN_WARNING
3384 "md: can not hot-add faulty %s disk to %s!\n",
3385 bdevname(rdev->bdev,b), mdname(mddev));
3386 err = -EINVAL;
3387 goto abort_export;
3388 }
b2d444d7 3389 clear_bit(In_sync, &rdev->flags);
1da177e4 3390 rdev->desc_nr = -1;
2bf071bf
N		 3391 err = bind_rdev_to_array(rdev, mddev);
3392 if (err)
3393 goto abort_export;
1da177e4
LT		 3394
3395 /*
3396 * The rest should better be atomic, we can have disk failures
3397 * noticed in interrupt contexts ...
3398 */
3399
3400 if (rdev->desc_nr == mddev->max_disks) {
3401 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
3402 mdname(mddev));
3403 err = -EBUSY;
3404 goto abort_unbind_export;
3405 }
3406
3407 rdev->raid_disk = -1;
3408
3409 md_update_sb(mddev);
3410
3411 /*
3412 * Kick recovery, maybe this spare has to be added to the
3413 * array immediately.
3414 */
3415 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3416 md_wakeup_thread(mddev->thread);
d7603b7e 3417 md_new_event(mddev);
1da177e4
LT		 3418 return 0;
3419
3420abort_unbind_export:
3421 unbind_rdev_from_array(rdev);
3422
3423abort_export:
3424 export_rdev(rdev);
3425 return err;
3426}
3427
32a7627c
N		 3428/* similar to deny_write_access, but accounts for our holding a reference
3429 * to the file ourselves */
3430static int deny_bitmap_write_access(struct file * file)
3431{
3432 struct inode *inode = file->f_mapping->host;
3433
3434 spin_lock(&inode->i_lock);
3435 if (atomic_read(&inode->i_writecount) > 1) {
3436 spin_unlock(&inode->i_lock);
3437 return -ETXTBSY;
3438 }
3439 atomic_set(&inode->i_writecount, -1);
3440 spin_unlock(&inode->i_lock);
3441
3442 return 0;
3443}
3444
3445static int set_bitmap_file(mddev_t *mddev, int fd)
3446{
3447 int err;
3448
36fa3063
N		 3449 if (mddev->pers) {
3450 if (!mddev->pers->quiesce)
3451 return -EBUSY;
3452 if (mddev->recovery || mddev->sync_thread)
3453 return -EBUSY;
3454 /* we should be able to change the bitmap.. */
3455 }
32a7627c 3456
32a7627c 3457
36fa3063
N		 3458 if (fd >= 0) {
3459 if (mddev->bitmap)
3460 return -EEXIST; /* cannot add when bitmap is present */
3461 mddev->bitmap_file = fget(fd);
32a7627c 3462
36fa3063
N		 3463 if (mddev->bitmap_file == NULL) {
3464 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
3465 mdname(mddev));
3466 return -EBADF;
3467 }
3468
3469 err = deny_bitmap_write_access(mddev->bitmap_file);
3470 if (err) {
3471 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
3472 mdname(mddev));
3473 fput(mddev->bitmap_file);
3474 mddev->bitmap_file = NULL;
3475 return err;
3476 }
a654b9d8 3477 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 3478 } else if (mddev->bitmap == NULL)
3479 return -ENOENT; /* cannot remove what isn't there */
3480 err = 0;
3481 if (mddev->pers) {
3482 mddev->pers->quiesce(mddev, 1);
3483 if (fd >= 0)
3484 err = bitmap_create(mddev);
3485 if (fd < 0 || err)
3486 bitmap_destroy(mddev);
3487 mddev->pers->quiesce(mddev, 0);
3488 } else if (fd < 0) {
3489 if (mddev->bitmap_file)
3490 fput(mddev->bitmap_file);
3491 mddev->bitmap_file = NULL;
3492 }
3493
32a7627c
N		 3494 return err;
3495}
3496
1da177e4
LT		 3497/*
3498 * set_array_info is used two different ways
3499 * The original usage is when creating a new array.
3500 * In this usage, raid_disks is > 0 and it together with
3501 * level, size, not_persistent,layout,chunksize determine the
3502 * shape of the array.
3503 * This will always create an array with a type-0.90.0 superblock.
3504 * The newer usage is when assembling an array.
3505 * In this case raid_disks will be 0, and the major_version field is
3506 * use to determine which style super-blocks are to be found on the devices.
3507 * The minor and patch _version numbers are also kept incase the
3508 * super_block handler wishes to interpret them.
3509 */
3510static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
3511{
3512
3513 if (info->raid_disks == 0) {
3514 /* just setting version number for superblock loading */
3515 if (info->major_version < 0 ||
3516 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
3517 super_types[info->major_version].name == NULL) {
3518 /* maybe try to auto-load a module? */
3519 printk(KERN_INFO
3520 "md: superblock version %d not known\n",
3521 info->major_version);
3522 return -EINVAL;
3523 }
3524 mddev->major_version = info->major_version;
3525 mddev->minor_version = info->minor_version;
3526 mddev->patch_version = info->patch_version;
3527 return 0;
3528 }
3529 mddev->major_version = MD_MAJOR_VERSION;
3530 mddev->minor_version = MD_MINOR_VERSION;
3531 mddev->patch_version = MD_PATCHLEVEL_VERSION;
3532 mddev->ctime = get_seconds();
3533
3534 mddev->level = info->level;
17115e03 3535 mddev->clevel[0] = 0;
1da177e4
LT		 3536 mddev->size = info->size;
3537 mddev->raid_disks = info->raid_disks;
3538 /* don't set md_minor, it is determined by which /dev/md* was
3539 * openned
3540 */
3541 if (info->state & (1<<MD_SB_CLEAN))
3542 mddev->recovery_cp = MaxSector;
3543 else
3544 mddev->recovery_cp = 0;
3545 mddev->persistent = ! info->not_persistent;
3546
3547 mddev->layout = info->layout;
3548 mddev->chunk_size = info->chunk_size;
3549
3550 mddev->max_disks = MD_SB_DISKS;
3551
3552 mddev->sb_dirty = 1;
3553
b2a2703c
N		 3554 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
3555 mddev->bitmap_offset = 0;
3556
f6705578
N		 3557 mddev->reshape_position = MaxSector;
3558
1da177e4
LT		 3559 /*
3560 * Generate a 128 bit UUID
3561 */
3562 get_random_bytes(mddev->uuid, 16);
3563
f6705578
N		 3564 mddev->new_level = mddev->level;
3565 mddev->new_chunk = mddev->chunk_size;
3566 mddev->new_layout = mddev->layout;
3567 mddev->delta_disks = 0;
3568
1da177e4
LT		 3569 return 0;
3570}
3571
a35b0d69
N		 3572static int update_size(mddev_t *mddev, unsigned long size)
3573{
3574 mdk_rdev_t * rdev;
3575 int rv;
3576 struct list_head *tmp;
8ddeeae5 3577 int fit = (size == 0);
a35b0d69
N		 3578
3579 if (mddev->pers->resize == NULL)
3580 return -EINVAL;
3581 /* The "size" is the amount of each device that is used.
3582 * This can only make sense for arrays with redundancy.
3583 * linear and raid0 always use whatever space is available
3584 * We can only consider changing the size if no resync
3585 * or reconstruction is happening, and if the new size
3586 * is acceptable. It must fit before the sb_offset or,
3587 * if that is <data_offset, it must fit before the
3588 * size of each device.
3589 * If size is zero, we find the largest size that fits.
3590 */
3591 if (mddev->sync_thread)
3592 return -EBUSY;
3593 ITERATE_RDEV(mddev,rdev,tmp) {
3594 sector_t avail;
a35b0d69
N		 3595 if (rdev->sb_offset > rdev->data_offset)
3596 avail = (rdev->sb_offset*2) - rdev->data_offset;
3597 else
3598 avail = get_capacity(rdev->bdev->bd_disk)
3599 - rdev->data_offset;
3600 if (fit && (size == 0 || size > avail/2))
3601 size = avail/2;
3602 if (avail < ((sector_t)size << 1))
3603 return -ENOSPC;
3604 }
3605 rv = mddev->pers->resize(mddev, (sector_t)size *2);
3606 if (!rv) {
3607 struct block_device *bdev;
3608
3609 bdev = bdget_disk(mddev->gendisk, 0);
3610 if (bdev) {
1b1dcc1b 3611 mutex_lock(&bdev->bd_inode->i_mutex);
6d89332b 3612 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
1b1dcc1b 3613 mutex_unlock(&bdev->bd_inode->i_mutex);
a35b0d69
N		 3614 bdput(bdev);
3615 }
3616 }
3617 return rv;
3618}
3619
da943b99
N		 3620static int update_raid_disks(mddev_t *mddev, int raid_disks)
3621{
3622 int rv;
3623 /* change the number of raid disks */
63c70c4f 3624 if (mddev->pers->check_reshape == NULL)
da943b99
N		 3625 return -EINVAL;
3626 if (raid_disks <= 0 ||
3627 raid_disks >= mddev->max_disks)
3628 return -EINVAL;
63c70c4f 3629 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
da943b99 3630 return -EBUSY;
63c70c4f
N		 3631 mddev->delta_disks = raid_disks - mddev->raid_disks;
3632
3633 rv = mddev->pers->check_reshape(mddev);
da943b99
N		 3634 return rv;
3635}
3636
3637
1da177e4
LT		 3638/*
3639 * update_array_info is used to change the configuration of an
3640 * on-line array.
3641 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
3642 * fields in the info are checked against the array.
3643 * Any differences that cannot be handled will cause an error.
3644 * Normally, only one change can be managed at a time.
3645 */
3646static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
3647{
3648 int rv = 0;
3649 int cnt = 0;
36fa3063
N		 3650 int state = 0;
3651
3652 /* calculate expected state,ignoring low bits */
3653 if (mddev->bitmap && mddev->bitmap_offset)
3654 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 3655
3656 if (mddev->major_version != info->major_version ||
3657 mddev->minor_version != info->minor_version ||
3658/* mddev->patch_version != info->patch_version || */
3659 mddev->ctime != info->ctime ||
3660 mddev->level != info->level ||
3661/* mddev->layout != info->layout || */
3662 !mddev->persistent != info->not_persistent||
36fa3063
N		 3663 mddev->chunk_size != info->chunk_size ||
3664 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
3665 ((state^info->state) & 0xfffffe00)
3666 )
1da177e4
LT		 3667 return -EINVAL;
3668 /* Check there is only one change */
284ae7ca 3669 if (info->size >= 0 && mddev->size != info->size) cnt++;
1da177e4
LT		 3670 if (mddev->raid_disks != info->raid_disks) cnt++;
3671 if (mddev->layout != info->layout) cnt++;
36fa3063 3672 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 3673 if (cnt == 0) return 0;
3674 if (cnt > 1) return -EINVAL;
3675
3676 if (mddev->layout != info->layout) {
3677 /* Change layout
3678 * we don't need to do anything at the md level, the
3679 * personality will take care of it all.
3680 */
3681 if (mddev->pers->reconfig == NULL)
3682 return -EINVAL;
3683 else
3684 return mddev->pers->reconfig(mddev, info->layout, -1);
3685 }
284ae7ca 3686 if (info->size >= 0 && mddev->size != info->size)
a35b0d69
N		 3687 rv = update_size(mddev, info->size);
3688
da943b99
N		 3689 if (mddev->raid_disks != info->raid_disks)
3690 rv = update_raid_disks(mddev, info->raid_disks);
3691
36fa3063
N		 3692 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
3693 if (mddev->pers->quiesce == NULL)
3694 return -EINVAL;
3695 if (mddev->recovery || mddev->sync_thread)
3696 return -EBUSY;
3697 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
3698 /* add the bitmap */
3699 if (mddev->bitmap)
3700 return -EEXIST;
3701 if (mddev->default_bitmap_offset == 0)
3702 return -EINVAL;
3703 mddev->bitmap_offset = mddev->default_bitmap_offset;
3704 mddev->pers->quiesce(mddev, 1);
3705 rv = bitmap_create(mddev);
3706 if (rv)
3707 bitmap_destroy(mddev);
3708 mddev->pers->quiesce(mddev, 0);
3709 } else {
3710 /* remove the bitmap */
3711 if (!mddev->bitmap)
3712 return -ENOENT;
3713 if (mddev->bitmap->file)
3714 return -EINVAL;
3715 mddev->pers->quiesce(mddev, 1);
3716 bitmap_destroy(mddev);
3717 mddev->pers->quiesce(mddev, 0);
3718 mddev->bitmap_offset = 0;
3719 }
3720 }
1da177e4
LT		 3721 md_update_sb(mddev);
3722 return rv;
3723}
3724
3725static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3726{
3727 mdk_rdev_t *rdev;
3728
3729 if (mddev->pers == NULL)
3730 return -ENODEV;
3731
3732 rdev = find_rdev(mddev, dev);
3733 if (!rdev)
3734 return -ENODEV;
3735
3736 md_error(mddev, rdev);
3737 return 0;
3738}
3739
a885c8c4
CH		 3740static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3741{
3742 mddev_t *mddev = bdev->bd_disk->private_data;
3743
3744 geo->heads = 2;
3745 geo->sectors = 4;
3746 geo->cylinders = get_capacity(mddev->gendisk) / 8;
3747 return 0;
3748}
3749
1da177e4
LT		 3750static int md_ioctl(struct inode *inode, struct file *file,
3751 unsigned int cmd, unsigned long arg)
3752{
3753 int err = 0;
3754 void __user *argp = (void __user *)arg;
1da177e4
LT		 3755 mddev_t *mddev = NULL;
3756
3757 if (!capable(CAP_SYS_ADMIN))
3758 return -EACCES;
3759
3760 /*
3761 * Commands dealing with the RAID driver but not any
3762 * particular array:
3763 */
3764 switch (cmd)
3765 {
3766 case RAID_VERSION:
3767 err = get_version(argp);
3768 goto done;
3769
3770 case PRINT_RAID_DEBUG:
3771 err = 0;
3772 md_print_devices();
3773 goto done;
3774
3775#ifndef MODULE
3776 case RAID_AUTORUN:
3777 err = 0;
3778 autostart_arrays(arg);
3779 goto done;
3780#endif
3781 default:;
3782 }
3783
3784 /*
3785 * Commands creating/starting a new array:
3786 */
3787
3788 mddev = inode->i_bdev->bd_disk->private_data;
3789
3790 if (!mddev) {
3791 BUG();
3792 goto abort;
3793 }
3794
3795
3796 if (cmd == START_ARRAY) {
3797 /* START_ARRAY doesn't need to lock the array as autostart_array
3798 * does the locking, and it could even be a different array
3799 */
3800 static int cnt = 3;
3801 if (cnt > 0 ) {
3802 printk(KERN_WARNING
3803 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
e8a00334 3804 "This will not be supported beyond July 2006\n",
1da177e4
LT		 3805 current->comm, current->pid);
3806 cnt--;
3807 }
3808 err = autostart_array(new_decode_dev(arg));
3809 if (err) {
3810 printk(KERN_WARNING "md: autostart failed!\n");
3811 goto abort;
3812 }
3813 goto done;
3814 }
3815
3816 err = mddev_lock(mddev);
3817 if (err) {
3818 printk(KERN_INFO
3819 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3820 err, cmd);
3821 goto abort;
3822 }
3823
3824 switch (cmd)
3825 {
3826 case SET_ARRAY_INFO:
3827 {
3828 mdu_array_info_t info;
3829 if (!arg)
3830 memset(&info, 0, sizeof(info));
3831 else if (copy_from_user(&info, argp, sizeof(info))) {
3832 err = -EFAULT;
3833 goto abort_unlock;
3834 }
3835 if (mddev->pers) {
3836 err = update_array_info(mddev, &info);
3837 if (err) {
3838 printk(KERN_WARNING "md: couldn't update"
3839 " array info. %d\n", err);
3840 goto abort_unlock;
3841 }
3842 goto done_unlock;
3843 }
3844 if (!list_empty(&mddev->disks)) {
3845 printk(KERN_WARNING
3846 "md: array %s already has disks!\n",
3847 mdname(mddev));
3848 err = -EBUSY;
3849 goto abort_unlock;
3850 }
3851 if (mddev->raid_disks) {
3852 printk(KERN_WARNING
3853 "md: array %s already initialised!\n",
3854 mdname(mddev));
3855 err = -EBUSY;
3856 goto abort_unlock;
3857 }
3858 err = set_array_info(mddev, &info);
3859 if (err) {
3860 printk(KERN_WARNING "md: couldn't set"
3861 " array info. %d\n", err);
3862 goto abort_unlock;
3863 }
3864 }
3865 goto done_unlock;
3866
3867 default:;
3868 }
3869
3870 /*
3871 * Commands querying/configuring an existing array:
3872 */
32a7627c
N		 3873 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3874 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3875 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3876 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
1da177e4
LT		 3877 err = -ENODEV;
3878 goto abort_unlock;
3879 }
3880
3881 /*
3882 * Commands even a read-only array can execute:
3883 */
3884 switch (cmd)
3885 {
3886 case GET_ARRAY_INFO:
3887 err = get_array_info(mddev, argp);
3888 goto done_unlock;
3889
32a7627c 3890 case GET_BITMAP_FILE:
87162a28 3891 err = get_bitmap_file(mddev, argp);
32a7627c
N		 3892 goto done_unlock;
3893
1da177e4
LT		 3894 case GET_DISK_INFO:
3895 err = get_disk_info(mddev, argp);
3896 goto done_unlock;
3897
3898 case RESTART_ARRAY_RW:
3899 err = restart_array(mddev);
3900 goto done_unlock;
3901
3902 case STOP_ARRAY:
3903 err = do_md_stop (mddev, 0);
3904 goto done_unlock;
3905
3906 case STOP_ARRAY_RO:
3907 err = do_md_stop (mddev, 1);
3908 goto done_unlock;
3909
3910 /*
3911 * We have a problem here : there is no easy way to give a CHS
3912 * virtual geometry. We currently pretend that we have a 2 heads
3913 * 4 sectors (with a BIG number of cylinders...). This drives
3914 * dosfs just mad... ;-)
3915 */
1da177e4
LT		 3916 }
3917
3918 /*
3919 * The remaining ioctls are changing the state of the
f91de92e
N		 3920 * superblock, so we do not allow them on read-only arrays.
3921 * However non-MD ioctls (e.g. get-size) will still come through
3922 * here and hit the 'default' below, so only disallow
3923 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 3924 */
f91de92e
N		 3925 if (_IOC_TYPE(cmd) == MD_MAJOR &&
3926 mddev->ro && mddev->pers) {
3927 if (mddev->ro == 2) {
3928 mddev->ro = 0;
3929 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3930 md_wakeup_thread(mddev->thread);
3931
3932 } else {
3933 err = -EROFS;
3934 goto abort_unlock;
3935 }
1da177e4
LT		 3936 }
3937
3938 switch (cmd)
3939 {
3940 case ADD_NEW_DISK:
3941 {
3942 mdu_disk_info_t info;
3943 if (copy_from_user(&info, argp, sizeof(info)))
3944 err = -EFAULT;
3945 else
3946 err = add_new_disk(mddev, &info);
3947 goto done_unlock;
3948 }
3949
3950 case HOT_REMOVE_DISK:
3951 err = hot_remove_disk(mddev, new_decode_dev(arg));
3952 goto done_unlock;
3953
3954 case HOT_ADD_DISK:
3955 err = hot_add_disk(mddev, new_decode_dev(arg));
3956 goto done_unlock;
3957
3958 case SET_DISK_FAULTY:
3959 err = set_disk_faulty(mddev, new_decode_dev(arg));
3960 goto done_unlock;
3961
3962 case RUN_ARRAY:
3963 err = do_md_run (mddev);
3964 goto done_unlock;
3965
32a7627c
N		 3966 case SET_BITMAP_FILE:
3967 err = set_bitmap_file(mddev, (int)arg);
3968 goto done_unlock;
3969
1da177e4
LT		 3970 default:
3971 if (_IOC_TYPE(cmd) == MD_MAJOR)
3972 printk(KERN_WARNING "md: %s(pid %d) used"
3973 " obsolete MD ioctl, upgrade your"
3974 " software to use new ictls.\n",
3975 current->comm, current->pid);
3976 err = -EINVAL;
3977 goto abort_unlock;
3978 }
3979
3980done_unlock:
3981abort_unlock:
3982 mddev_unlock(mddev);
3983
3984 return err;
3985done:
3986 if (err)
3987 MD_BUG();
3988abort:
3989 return err;
3990}
3991
3992static int md_open(struct inode *inode, struct file *file)
3993{
3994 /*
3995 * Succeed if we can lock the mddev, which confirms that
3996 * it isn't being stopped right now.
3997 */
3998 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3999 int err;
4000
4001 if ((err = mddev_lock(mddev)))
4002 goto out;
4003
4004 err = 0;
4005 mddev_get(mddev);
4006 mddev_unlock(mddev);
4007
4008 check_disk_change(inode->i_bdev);
4009 out:
4010 return err;
4011}
4012
4013static int md_release(struct inode *inode, struct file * file)
4014{
4015 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4016
4017 if (!mddev)
4018 BUG();
4019 mddev_put(mddev);
4020
4021 return 0;
4022}
4023
4024static int md_media_changed(struct gendisk *disk)
4025{
4026 mddev_t *mddev = disk->private_data;
4027
4028 return mddev->changed;
4029}
4030
4031static int md_revalidate(struct gendisk *disk)
4032{
4033 mddev_t *mddev = disk->private_data;
4034
4035 mddev->changed = 0;
4036 return 0;
4037}
4038static struct block_device_operations md_fops =
4039{
4040 .owner = THIS_MODULE,
4041 .open = md_open,
4042 .release = md_release,
4043 .ioctl = md_ioctl,
a885c8c4 4044 .getgeo = md_getgeo,
1da177e4
LT		 4045 .media_changed = md_media_changed,
4046 .revalidate_disk= md_revalidate,
4047};
4048
75c96f85 4049static int md_thread(void * arg)
1da177e4
LT		 4050{
4051 mdk_thread_t *thread = arg;
4052
1da177e4
LT		 4053 /*
4054 * md_thread is a 'system-thread', it's priority should be very
4055 * high. We avoid resource deadlocks individually in each
4056 * raid personality. (RAID5 does preallocation) We also use RR and
4057 * the very same RT priority as kswapd, thus we will never get
4058 * into a priority inversion deadlock.
4059 *
4060 * we definitely have to have equal or higher priority than
4061 * bdflush, otherwise bdflush will deadlock if there are too
4062 * many dirty RAID5 blocks.
4063 */
1da177e4 4064
6985c43f 4065 allow_signal(SIGKILL);
a6fb0934 4066 while (!kthread_should_stop()) {
1da177e4 4067
93588e22
N		 4068 /* We need to wait INTERRUPTIBLE so that
4069 * we don't add to the load-average.
4070 * That means we need to be sure no signals are
4071 * pending
4072 */
4073 if (signal_pending(current))
4074 flush_signals(current);
4075
4076 wait_event_interruptible_timeout
4077 (thread->wqueue,
4078 test_bit(THREAD_WAKEUP, &thread->flags)
4079 || kthread_should_stop(),
4080 thread->timeout);
3e1d1d28 4081 try_to_freeze();
1da177e4
LT		 4082
4083 clear_bit(THREAD_WAKEUP, &thread->flags);
4084
787453c2 4085 thread->run(thread->mddev);
1da177e4 4086 }
a6fb0934 4087
1da177e4
LT		 4088 return 0;
4089}
4090
4091void md_wakeup_thread(mdk_thread_t *thread)
4092{
4093 if (thread) {
4094 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4095 set_bit(THREAD_WAKEUP, &thread->flags);
4096 wake_up(&thread->wqueue);
4097 }
4098}
4099
4100mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4101 const char *name)
4102{
4103 mdk_thread_t *thread;
1da177e4 4104
9ffae0cf 4105 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 4106 if (!thread)
4107 return NULL;
4108
1da177e4
LT		 4109 init_waitqueue_head(&thread->wqueue);
4110
1da177e4
LT		 4111 thread->run = run;
4112 thread->mddev = mddev;
32a7627c 4113 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 4114 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 4115 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 4116 kfree(thread);
4117 return NULL;
4118 }
1da177e4
LT		 4119 return thread;
4120}
4121
1da177e4
LT		 4122void md_unregister_thread(mdk_thread_t *thread)
4123{
d28446fe 4124 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
a6fb0934
N		 4125
4126 kthread_stop(thread->tsk);
1da177e4
LT		 4127 kfree(thread);
4128}
4129
4130void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4131{
4132 if (!mddev) {
4133 MD_BUG();
4134 return;
4135 }
4136
b2d444d7 4137 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 4138 return;
32a7627c 4139/*
1da177e4
LT		 4140 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4141 mdname(mddev),
4142 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4143 __builtin_return_address(0),__builtin_return_address(1),
4144 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 4145*/
1da177e4
LT		 4146 if (!mddev->pers->error_handler)
4147 return;
4148 mddev->pers->error_handler(mddev,rdev);
4149 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4150 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4151 md_wakeup_thread(mddev->thread);
d7603b7e 4152 md_new_event(mddev);
1da177e4
LT		 4153}
4154
4155/* seq_file implementation /proc/mdstat */
4156
4157static void status_unused(struct seq_file *seq)
4158{
4159 int i = 0;
4160 mdk_rdev_t *rdev;
4161 struct list_head *tmp;
4162
4163 seq_printf(seq, "unused devices: ");
4164
4165 ITERATE_RDEV_PENDING(rdev,tmp) {
4166 char b[BDEVNAME_SIZE];
4167 i++;
4168 seq_printf(seq, "%s ",
4169 bdevname(rdev->bdev,b));
4170 }
4171 if (!i)
4172 seq_printf(seq, "<none>");
4173
4174 seq_printf(seq, "\n");
4175}
4176
4177
4178static void status_resync(struct seq_file *seq, mddev_t * mddev)
4179{
4588b42e
N		 4180 sector_t max_blocks, resync, res;
4181 unsigned long dt, db, rt;
4182 int scale;
4183 unsigned int per_milli;
1da177e4
LT		 4184
4185 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4186
4187 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4188 max_blocks = mddev->resync_max_sectors >> 1;
4189 else
4190 max_blocks = mddev->size;
4191
4192 /*
4193 * Should not happen.
4194 */
4195 if (!max_blocks) {
4196 MD_BUG();
4197 return;
4198 }
4588b42e
N		 4199 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4200 * in a sector_t, and (max_blocks>>scale) will fit in a
4201 * u32, as those are the requirements for sector_div.
4202 * Thus 'scale' must be at least 10
4203 */
4204 scale = 10;
4205 if (sizeof(sector_t) > sizeof(unsigned long)) {
4206 while ( max_blocks/2 > (1ULL<<(scale+32)))
4207 scale++;
4208 }
4209 res = (resync>>scale)*1000;
4210 sector_div(res, (u32)((max_blocks>>scale)+1));
4211
4212 per_milli = res;
1da177e4 4213 {
4588b42e 4214 int i, x = per_milli/50, y = 20-x;
1da177e4
LT		 4215 seq_printf(seq, "[");
4216 for (i = 0; i < x; i++)
4217 seq_printf(seq, "=");
4218 seq_printf(seq, ">");
4219 for (i = 0; i < y; i++)
4220 seq_printf(seq, ".");
4221 seq_printf(seq, "] ");
4222 }
4588b42e 4223 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
ccfcc3c1
N		 4224 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
4225 "reshape" :
1da177e4 4226 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
ccfcc3c1 4227 "resync" : "recovery")),
4588b42e
N		 4228 per_milli/10, per_milli % 10,
4229 (unsigned long long) resync,
4230 (unsigned long long) max_blocks);
1da177e4
LT		 4231
4232 /*
4233 * We do not want to overflow, so the order of operands and
4234 * the * 100 / 100 trick are important. We do a +1 to be
4235 * safe against division by zero. We only estimate anyway.
4236 *
4237 * dt: time from mark until now
4238 * db: blocks written from mark until now
4239 * rt: remaining time
4240 */
4241 dt = ((jiffies - mddev->resync_mark) / HZ);
4242 if (!dt) dt++;
4243 db = resync - (mddev->resync_mark_cnt/2);
4588b42e 4244 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/100+1)))/100;
1da177e4
LT		 4245
4246 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4247
4248 seq_printf(seq, " speed=%ldK/sec", db/dt);
4249}
4250
4251static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4252{
4253 struct list_head *tmp;
4254 loff_t l = *pos;
4255 mddev_t *mddev;
4256
4257 if (l >= 0x10000)
4258 return NULL;
4259 if (!l--)
4260 /* header */
4261 return (void*)1;
4262
4263 spin_lock(&all_mddevs_lock);
4264 list_for_each(tmp,&all_mddevs)
4265 if (!l--) {
4266 mddev = list_entry(tmp, mddev_t, all_mddevs);
4267 mddev_get(mddev);
4268 spin_unlock(&all_mddevs_lock);
4269 return mddev;
4270 }
4271 spin_unlock(&all_mddevs_lock);
4272 if (!l--)
4273 return (void*)2;/* tail */
4274 return NULL;
4275}
4276
4277static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4278{
4279 struct list_head *tmp;
4280 mddev_t *next_mddev, *mddev = v;
4281
4282 ++*pos;
4283 if (v == (void*)2)
4284 return NULL;
4285
4286 spin_lock(&all_mddevs_lock);
4287 if (v == (void*)1)
4288 tmp = all_mddevs.next;
4289 else
4290 tmp = mddev->all_mddevs.next;
4291 if (tmp != &all_mddevs)
4292 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4293 else {
4294 next_mddev = (void*)2;
4295 *pos = 0x10000;
4296 }
4297 spin_unlock(&all_mddevs_lock);
4298
4299 if (v != (void*)1)
4300 mddev_put(mddev);
4301 return next_mddev;
4302
4303}
4304
4305static void md_seq_stop(struct seq_file *seq, void *v)
4306{
4307 mddev_t *mddev = v;
4308
4309 if (mddev && v != (void*)1 && v != (void*)2)
4310 mddev_put(mddev);
4311}
4312
d7603b7e
N		 4313struct mdstat_info {
4314 int event;
4315};
4316
1da177e4
LT		 4317static int md_seq_show(struct seq_file *seq, void *v)
4318{
4319 mddev_t *mddev = v;
4320 sector_t size;
4321 struct list_head *tmp2;
4322 mdk_rdev_t *rdev;
d7603b7e 4323 struct mdstat_info *mi = seq->private;
32a7627c 4324 struct bitmap *bitmap;
1da177e4
LT		 4325
4326 if (v == (void*)1) {
2604b703 4327 struct mdk_personality *pers;
1da177e4
LT		 4328 seq_printf(seq, "Personalities : ");
4329 spin_lock(&pers_lock);
2604b703
N		 4330 list_for_each_entry(pers, &pers_list, list)
4331 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT		 4332
4333 spin_unlock(&pers_lock);
4334 seq_printf(seq, "\n");
d7603b7e 4335 mi->event = atomic_read(&md_event_count);
1da177e4
LT		 4336 return 0;
4337 }
4338 if (v == (void*)2) {
4339 status_unused(seq);
4340 return 0;
4341 }
4342
5dc5cf7d 4343 if (mddev_lock(mddev) < 0)
1da177e4 4344 return -EINTR;
5dc5cf7d 4345
1da177e4
LT		 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)
c71d4887 5031 if (mddev_trylock(mddev)) {
1da177e4 5032 do_md_stop (mddev, 1);
c71d4887
NB		 5033 mddev_unlock(mddev);
5034 }
1da177e4
LT		 5035 /*
5036 * certain more exotic SCSI devices are known to be
5037 * volatile wrt too early system reboots. While the
5038 * right place to handle this issue is the given
5039 * driver, we do want to have a safe RAID driver ...
5040 */
5041 mdelay(1000*1);
5042 }
5043 return NOTIFY_DONE;
5044}
5045
75c96f85 5046static struct notifier_block md_notifier = {
1da177e4
LT		 5047 .notifier_call = md_notify_reboot,
5048 .next = NULL,
5049 .priority = INT_MAX, /* before any real devices */
5050};
5051
5052static void md_geninit(void)
5053{
5054 struct proc_dir_entry *p;
5055
5056 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5057
5058 p = create_proc_entry("mdstat", S_IRUGO, NULL);
5059 if (p)
5060 p->proc_fops = &md_seq_fops;
5061}
5062
75c96f85 5063static int __init md_init(void)
1da177e4
LT		 5064{
5065 int minor;
5066
5067 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
5068 " MD_SB_DISKS=%d\n",
5069 MD_MAJOR_VERSION, MD_MINOR_VERSION,
5070 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
bd926c63 5071 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
32a7627c 5072 BITMAP_MINOR);
1da177e4
LT		 5073
5074 if (register_blkdev(MAJOR_NR, "md"))
5075 return -1;
5076 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
5077 unregister_blkdev(MAJOR_NR, "md");
5078 return -1;
5079 }
5080 devfs_mk_dir("md");
5081 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
5082 md_probe, NULL, NULL);
5083 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
5084 md_probe, NULL, NULL);
5085
5086 for (minor=0; minor < MAX_MD_DEVS; ++minor)
5087 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
5088 S_IFBLK|S_IRUSR|S_IWUSR,
5089 "md/%d", minor);
5090
5091 for (minor=0; minor < MAX_MD_DEVS; ++minor)
5092 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
5093 S_IFBLK|S_IRUSR|S_IWUSR,
5094 "md/mdp%d", minor);
5095
5096
5097 register_reboot_notifier(&md_notifier);
5098 raid_table_header = register_sysctl_table(raid_root_table, 1);
5099
5100 md_geninit();
5101 return (0);
5102}
5103
5104
5105#ifndef MODULE
5106
5107/*
5108 * Searches all registered partitions for autorun RAID arrays
5109 * at boot time.
5110 */
5111static dev_t detected_devices[128];
5112static int dev_cnt;
5113
5114void md_autodetect_dev(dev_t dev)
5115{
5116 if (dev_cnt >= 0 && dev_cnt < 127)
5117 detected_devices[dev_cnt++] = dev;
5118}
5119
5120
5121static void autostart_arrays(int part)
5122{
5123 mdk_rdev_t *rdev;
5124 int i;
5125
5126 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
5127
5128 for (i = 0; i < dev_cnt; i++) {
5129 dev_t dev = detected_devices[i];
5130
5131 rdev = md_import_device(dev,0, 0);
5132 if (IS_ERR(rdev))
5133 continue;
5134
b2d444d7 5135 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 5136 MD_BUG();
5137 continue;
5138 }
5139 list_add(&rdev->same_set, &pending_raid_disks);
5140 }
5141 dev_cnt = 0;
5142
5143 autorun_devices(part);
5144}
5145
5146#endif
5147
5148static __exit void md_exit(void)
5149{
5150 mddev_t *mddev;
5151 struct list_head *tmp;
5152 int i;
5153 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
5154 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
5155 for (i=0; i < MAX_MD_DEVS; i++)
5156 devfs_remove("md/%d", i);
5157 for (i=0; i < MAX_MD_DEVS; i++)
5158 devfs_remove("md/d%d", i);
5159
5160 devfs_remove("md");
5161
5162 unregister_blkdev(MAJOR_NR,"md");
5163 unregister_blkdev(mdp_major, "mdp");
5164 unregister_reboot_notifier(&md_notifier);
5165 unregister_sysctl_table(raid_table_header);
5166 remove_proc_entry("mdstat", NULL);
5167 ITERATE_MDDEV(mddev,tmp) {
5168 struct gendisk *disk = mddev->gendisk;
5169 if (!disk)
5170 continue;
5171 export_array(mddev);
5172 del_gendisk(disk);
5173 put_disk(disk);
5174 mddev->gendisk = NULL;
5175 mddev_put(mddev);
5176 }
5177}
5178
5179module_init(md_init)
5180module_exit(md_exit)
5181
f91de92e
N		 5182static int get_ro(char *buffer, struct kernel_param *kp)
5183{
5184 return sprintf(buffer, "%d", start_readonly);
5185}
5186static int set_ro(const char *val, struct kernel_param *kp)
5187{
5188 char *e;
5189 int num = simple_strtoul(val, &e, 10);
5190 if (*val && (*e == '\0' || *e == '\n')) {
5191 start_readonly = num;
4dbcdc75 5192 return 0;
f91de92e
N		 5193 }
5194 return -EINVAL;
5195}
5196
5197module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
6ff8d8ec
N		 5198module_param(start_dirty_degraded, int, 0644);
5199
f91de92e 5200
1da177e4
LT		 5201EXPORT_SYMBOL(register_md_personality);
5202EXPORT_SYMBOL(unregister_md_personality);
5203EXPORT_SYMBOL(md_error);
5204EXPORT_SYMBOL(md_done_sync);
5205EXPORT_SYMBOL(md_write_start);
5206EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 5207EXPORT_SYMBOL(md_register_thread);
5208EXPORT_SYMBOL(md_unregister_thread);
5209EXPORT_SYMBOL(md_wakeup_thread);
5210EXPORT_SYMBOL(md_print_devices);
5211EXPORT_SYMBOL(md_check_recovery);
5212MODULE_LICENSE("GPL");
aa1595e9 5213MODULE_ALIAS("md");
72008652 5214MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
kernel source for telekom puls (alcatel/mediatek)