projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[PATCH] md: Remove attempt to use dynamic names in sysfs for component devices on...
[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>
45
46#include <linux/init.h>
47
32a7627c
N		 48#include <linux/file.h>
49
1da177e4
LT		 50#ifdef CONFIG_KMOD
51#include <linux/kmod.h>
52#endif
53
54#include <asm/unaligned.h>
55
56#define MAJOR_NR MD_MAJOR
57#define MD_DRIVER
58
59/* 63 partitions with the alternate major number (mdp) */
60#define MdpMinorShift 6
61
62#define DEBUG 0
63#define dprintk(x...) ((void)(DEBUG && printk(x)))
64
65
66#ifndef MODULE
67static void autostart_arrays (int part);
68#endif
69
70static mdk_personality_t *pers[MAX_PERSONALITY];
71static DEFINE_SPINLOCK(pers_lock);
72
73/*
74 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
75 * is 1000 KB/sec, so the extra system load does not show up that much.
76 * Increase it if you want to have more _guaranteed_ speed. Note that
338cec32 77 * the RAID driver will use the maximum available bandwidth if the IO
1da177e4
LT		 78 * subsystem is idle. There is also an 'absolute maximum' reconstruction
79 * speed limit - in case reconstruction slows down your system despite
80 * idle IO detection.
81 *
82 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
83 */
84
85static int sysctl_speed_limit_min = 1000;
86static int sysctl_speed_limit_max = 200000;
87
88static struct ctl_table_header *raid_table_header;
89
90static ctl_table raid_table[] = {
91 {
92 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
93 .procname = "speed_limit_min",
94 .data = &sysctl_speed_limit_min,
95 .maxlen = sizeof(int),
96 .mode = 0644,
97 .proc_handler = &proc_dointvec,
98 },
99 {
100 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
101 .procname = "speed_limit_max",
102 .data = &sysctl_speed_limit_max,
103 .maxlen = sizeof(int),
104 .mode = 0644,
105 .proc_handler = &proc_dointvec,
106 },
107 { .ctl_name = 0 }
108};
109
110static ctl_table raid_dir_table[] = {
111 {
112 .ctl_name = DEV_RAID,
113 .procname = "raid",
114 .maxlen = 0,
115 .mode = 0555,
116 .child = raid_table,
117 },
118 { .ctl_name = 0 }
119};
120
121static ctl_table raid_root_table[] = {
122 {
123 .ctl_name = CTL_DEV,
124 .procname = "dev",
125 .maxlen = 0,
126 .mode = 0555,
127 .child = raid_dir_table,
128 },
129 { .ctl_name = 0 }
130};
131
132static struct block_device_operations md_fops;
133
134/*
135 * Enables to iterate over all existing md arrays
136 * all_mddevs_lock protects this list.
137 */
138static LIST_HEAD(all_mddevs);
139static DEFINE_SPINLOCK(all_mddevs_lock);
140
141
142/*
143 * iterates through all used mddevs in the system.
144 * We take care to grab the all_mddevs_lock whenever navigating
145 * the list, and to always hold a refcount when unlocked.
146 * Any code which breaks out of this loop while own
147 * a reference to the current mddev and must mddev_put it.
148 */
149#define ITERATE_MDDEV(mddev,tmp) \
150 \
151 for (({ spin_lock(&all_mddevs_lock); \
152 tmp = all_mddevs.next; \
153 mddev = NULL;}); \
154 ({ if (tmp != &all_mddevs) \
155 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
156 spin_unlock(&all_mddevs_lock); \
157 if (mddev) mddev_put(mddev); \
158 mddev = list_entry(tmp, mddev_t, all_mddevs); \
159 tmp != &all_mddevs;}); \
160 ({ spin_lock(&all_mddevs_lock); \
161 tmp = tmp->next;}) \
162 )
163
164
165static int md_fail_request (request_queue_t *q, struct bio *bio)
166{
167 bio_io_error(bio, bio->bi_size);
168 return 0;
169}
170
171static inline mddev_t *mddev_get(mddev_t *mddev)
172{
173 atomic_inc(&mddev->active);
174 return mddev;
175}
176
177static void mddev_put(mddev_t *mddev)
178{
179 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
180 return;
181 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
182 list_del(&mddev->all_mddevs);
183 blk_put_queue(mddev->queue);
eae1701f 184 kobject_unregister(&mddev->kobj);
1da177e4
LT		 185 }
186 spin_unlock(&all_mddevs_lock);
187}
188
189static mddev_t * mddev_find(dev_t unit)
190{
191 mddev_t *mddev, *new = NULL;
192
193 retry:
194 spin_lock(&all_mddevs_lock);
195 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
196 if (mddev->unit == unit) {
197 mddev_get(mddev);
198 spin_unlock(&all_mddevs_lock);
990a8baf 199 kfree(new);
1da177e4
LT		 200 return mddev;
201 }
202
203 if (new) {
204 list_add(&new->all_mddevs, &all_mddevs);
205 spin_unlock(&all_mddevs_lock);
206 return new;
207 }
208 spin_unlock(&all_mddevs_lock);
209
210 new = (mddev_t *) kmalloc(sizeof(*new), GFP_KERNEL);
211 if (!new)
212 return NULL;
213
214 memset(new, 0, sizeof(*new));
215
216 new->unit = unit;
217 if (MAJOR(unit) == MD_MAJOR)
218 new->md_minor = MINOR(unit);
219 else
220 new->md_minor = MINOR(unit) >> MdpMinorShift;
221
222 init_MUTEX(&new->reconfig_sem);
223 INIT_LIST_HEAD(&new->disks);
224 INIT_LIST_HEAD(&new->all_mddevs);
225 init_timer(&new->safemode_timer);
226 atomic_set(&new->active, 1);
06d91a5f 227 spin_lock_init(&new->write_lock);
3d310eb7 228 init_waitqueue_head(&new->sb_wait);
1da177e4
LT		 229
230 new->queue = blk_alloc_queue(GFP_KERNEL);
231 if (!new->queue) {
232 kfree(new);
233 return NULL;
234 }
235
236 blk_queue_make_request(new->queue, md_fail_request);
237
238 goto retry;
239}
240
241static inline int mddev_lock(mddev_t * mddev)
242{
243 return down_interruptible(&mddev->reconfig_sem);
244}
245
246static inline void mddev_lock_uninterruptible(mddev_t * mddev)
247{
248 down(&mddev->reconfig_sem);
249}
250
251static inline int mddev_trylock(mddev_t * mddev)
252{
253 return down_trylock(&mddev->reconfig_sem);
254}
255
256static inline void mddev_unlock(mddev_t * mddev)
257{
258 up(&mddev->reconfig_sem);
259
005eca5e 260 md_wakeup_thread(mddev->thread);
1da177e4
LT		 261}
262
263mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
264{
265 mdk_rdev_t * rdev;
266 struct list_head *tmp;
267
268 ITERATE_RDEV(mddev,rdev,tmp) {
269 if (rdev->desc_nr == nr)
270 return rdev;
271 }
272 return NULL;
273}
274
275static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
276{
277 struct list_head *tmp;
278 mdk_rdev_t *rdev;
279
280 ITERATE_RDEV(mddev,rdev,tmp) {
281 if (rdev->bdev->bd_dev == dev)
282 return rdev;
283 }
284 return NULL;
285}
286
77933d72 287static inline sector_t calc_dev_sboffset(struct block_device *bdev)
1da177e4
LT		 288{
289 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
290 return MD_NEW_SIZE_BLOCKS(size);
291}
292
293static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
294{
295 sector_t size;
296
297 size = rdev->sb_offset;
298
299 if (chunk_size)
300 size &= ~((sector_t)chunk_size/1024 - 1);
301 return size;
302}
303
304static int alloc_disk_sb(mdk_rdev_t * rdev)
305{
306 if (rdev->sb_page)
307 MD_BUG();
308
309 rdev->sb_page = alloc_page(GFP_KERNEL);
310 if (!rdev->sb_page) {
311 printk(KERN_ALERT "md: out of memory.\n");
312 return -EINVAL;
313 }
314
315 return 0;
316}
317
318static void free_disk_sb(mdk_rdev_t * rdev)
319{
320 if (rdev->sb_page) {
321 page_cache_release(rdev->sb_page);
322 rdev->sb_loaded = 0;
323 rdev->sb_page = NULL;
324 rdev->sb_offset = 0;
325 rdev->size = 0;
326 }
327}
328
329
7bfa19f2
N		 330static int super_written(struct bio *bio, unsigned int bytes_done, int error)
331{
332 mdk_rdev_t *rdev = bio->bi_private;
a9701a30 333 mddev_t *mddev = rdev->mddev;
7bfa19f2
N		 334 if (bio->bi_size)
335 return 1;
336
337 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags))
a9701a30 338 md_error(mddev, rdev);
7bfa19f2 339
a9701a30
N		 340 if (atomic_dec_and_test(&mddev->pending_writes))
341 wake_up(&mddev->sb_wait);
f8b58edf 342 bio_put(bio);
7bfa19f2
N		 343 return 0;
344}
345
a9701a30
N		 346static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
347{
348 struct bio *bio2 = bio->bi_private;
349 mdk_rdev_t *rdev = bio2->bi_private;
350 mddev_t *mddev = rdev->mddev;
351 if (bio->bi_size)
352 return 1;
353
354 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
355 error == -EOPNOTSUPP) {
356 unsigned long flags;
357 /* barriers don't appear to be supported :-( */
358 set_bit(BarriersNotsupp, &rdev->flags);
359 mddev->barriers_work = 0;
360 spin_lock_irqsave(&mddev->write_lock, flags);
361 bio2->bi_next = mddev->biolist;
362 mddev->biolist = bio2;
363 spin_unlock_irqrestore(&mddev->write_lock, flags);
364 wake_up(&mddev->sb_wait);
365 bio_put(bio);
366 return 0;
367 }
368 bio_put(bio2);
369 bio->bi_private = rdev;
370 return super_written(bio, bytes_done, error);
371}
372
7bfa19f2
N		 373void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
374 sector_t sector, int size, struct page *page)
375{
376 /* write first size bytes of page to sector of rdev
377 * Increment mddev->pending_writes before returning
378 * and decrement it on completion, waking up sb_wait
379 * if zero is reached.
380 * If an error occurred, call md_error
a9701a30
N		 381 *
382 * As we might need to resubmit the request if BIO_RW_BARRIER
383 * causes ENOTSUPP, we allocate a spare bio...
7bfa19f2
N		 384 */
385 struct bio *bio = bio_alloc(GFP_NOIO, 1);
a9701a30 386 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
7bfa19f2
N		 387
388 bio->bi_bdev = rdev->bdev;
389 bio->bi_sector = sector;
390 bio_add_page(bio, page, size, 0);
391 bio->bi_private = rdev;
392 bio->bi_end_io = super_written;
a9701a30
N		 393 bio->bi_rw = rw;
394
7bfa19f2 395 atomic_inc(&mddev->pending_writes);
a9701a30
N		 396 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
397 struct bio *rbio;
398 rw |= (1<<BIO_RW_BARRIER);
399 rbio = bio_clone(bio, GFP_NOIO);
400 rbio->bi_private = bio;
401 rbio->bi_end_io = super_written_barrier;
402 submit_bio(rw, rbio);
403 } else
404 submit_bio(rw, bio);
405}
406
407void md_super_wait(mddev_t *mddev)
408{
409 /* wait for all superblock writes that were scheduled to complete.
410 * if any had to be retried (due to BARRIER problems), retry them
411 */
412 DEFINE_WAIT(wq);
413 for(;;) {
414 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
415 if (atomic_read(&mddev->pending_writes)==0)
416 break;
417 while (mddev->biolist) {
418 struct bio *bio;
419 spin_lock_irq(&mddev->write_lock);
420 bio = mddev->biolist;
421 mddev->biolist = bio->bi_next ;
422 bio->bi_next = NULL;
423 spin_unlock_irq(&mddev->write_lock);
424 submit_bio(bio->bi_rw, bio);
425 }
426 schedule();
427 }
428 finish_wait(&mddev->sb_wait, &wq);
7bfa19f2
N		 429}
430
1da177e4
LT		 431static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
432{
433 if (bio->bi_size)
434 return 1;
435
436 complete((struct completion*)bio->bi_private);
437 return 0;
438}
439
a654b9d8 440int sync_page_io(struct block_device *bdev, sector_t sector, int size,
1da177e4
LT		 441 struct page *page, int rw)
442{
baaa2c51 443 struct bio *bio = bio_alloc(GFP_NOIO, 1);
1da177e4
LT		 444 struct completion event;
445 int ret;
446
447 rw |= (1 << BIO_RW_SYNC);
448
449 bio->bi_bdev = bdev;
450 bio->bi_sector = sector;
451 bio_add_page(bio, page, size, 0);
452 init_completion(&event);
453 bio->bi_private = &event;
454 bio->bi_end_io = bi_complete;
455 submit_bio(rw, bio);
456 wait_for_completion(&event);
457
458 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
459 bio_put(bio);
460 return ret;
461}
462
0002b271 463static int read_disk_sb(mdk_rdev_t * rdev, int size)
1da177e4
LT		 464{
465 char b[BDEVNAME_SIZE];
466 if (!rdev->sb_page) {
467 MD_BUG();
468 return -EINVAL;
469 }
470 if (rdev->sb_loaded)
471 return 0;
472
473
0002b271 474 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
1da177e4
LT		 475 goto fail;
476 rdev->sb_loaded = 1;
477 return 0;
478
479fail:
480 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
481 bdevname(rdev->bdev,b));
482 return -EINVAL;
483}
484
485static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
486{
487 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
488 (sb1->set_uuid1 == sb2->set_uuid1) &&
489 (sb1->set_uuid2 == sb2->set_uuid2) &&
490 (sb1->set_uuid3 == sb2->set_uuid3))
491
492 return 1;
493
494 return 0;
495}
496
497
498static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
499{
500 int ret;
501 mdp_super_t *tmp1, *tmp2;
502
503 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
504 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
505
506 if (!tmp1 || !tmp2) {
507 ret = 0;
508 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
509 goto abort;
510 }
511
512 *tmp1 = *sb1;
513 *tmp2 = *sb2;
514
515 /*
516 * nr_disks is not constant
517 */
518 tmp1->nr_disks = 0;
519 tmp2->nr_disks = 0;
520
521 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
522 ret = 0;
523 else
524 ret = 1;
525
526abort:
990a8baf
JJ		 527 kfree(tmp1);
528 kfree(tmp2);
1da177e4
LT		 529 return ret;
530}
531
532static unsigned int calc_sb_csum(mdp_super_t * sb)
533{
534 unsigned int disk_csum, csum;
535
536 disk_csum = sb->sb_csum;
537 sb->sb_csum = 0;
538 csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
539 sb->sb_csum = disk_csum;
540 return csum;
541}
542
543
544/*
545 * Handle superblock details.
546 * We want to be able to handle multiple superblock formats
547 * so we have a common interface to them all, and an array of
548 * different handlers.
549 * We rely on user-space to write the initial superblock, and support
550 * reading and updating of superblocks.
551 * Interface methods are:
552 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
553 * loads and validates a superblock on dev.
554 * if refdev != NULL, compare superblocks on both devices
555 * Return:
556 * 0 - dev has a superblock that is compatible with refdev
557 * 1 - dev has a superblock that is compatible and newer than refdev
558 * so dev should be used as the refdev in future
559 * -EINVAL superblock incompatible or invalid
560 * -othererror e.g. -EIO
561 *
562 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
563 * Verify that dev is acceptable into mddev.
564 * The first time, mddev->raid_disks will be 0, and data from
565 * dev should be merged in. Subsequent calls check that dev
566 * is new enough. Return 0 or -EINVAL
567 *
568 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
569 * Update the superblock for rdev with data in mddev
570 * This does not write to disc.
571 *
572 */
573
574struct super_type {
575 char *name;
576 struct module *owner;
577 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
578 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
579 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
580};
581
582/*
583 * load_super for 0.90.0
584 */
585static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
586{
587 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
588 mdp_super_t *sb;
589 int ret;
590 sector_t sb_offset;
591
592 /*
593 * Calculate the position of the superblock,
594 * it's at the end of the disk.
595 *
596 * It also happens to be a multiple of 4Kb.
597 */
598 sb_offset = calc_dev_sboffset(rdev->bdev);
599 rdev->sb_offset = sb_offset;
600
0002b271 601 ret = read_disk_sb(rdev, MD_SB_BYTES);
1da177e4
LT		 602 if (ret) return ret;
603
604 ret = -EINVAL;
605
606 bdevname(rdev->bdev, b);
607 sb = (mdp_super_t*)page_address(rdev->sb_page);
608
609 if (sb->md_magic != MD_SB_MAGIC) {
610 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
611 b);
612 goto abort;
613 }
614
615 if (sb->major_version != 0 ||
616 sb->minor_version != 90) {
617 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
618 sb->major_version, sb->minor_version,
619 b);
620 goto abort;
621 }
622
623 if (sb->raid_disks <= 0)
624 goto abort;
625
626 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
627 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
628 b);
629 goto abort;
630 }
631
632 rdev->preferred_minor = sb->md_minor;
633 rdev->data_offset = 0;
0002b271 634 rdev->sb_size = MD_SB_BYTES;
1da177e4
LT		 635
636 if (sb->level == LEVEL_MULTIPATH)
637 rdev->desc_nr = -1;
638 else
639 rdev->desc_nr = sb->this_disk.number;
640
641 if (refdev == 0)
642 ret = 1;
643 else {
644 __u64 ev1, ev2;
645 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
646 if (!uuid_equal(refsb, sb)) {
647 printk(KERN_WARNING "md: %s has different UUID to %s\n",
648 b, bdevname(refdev->bdev,b2));
649 goto abort;
650 }
651 if (!sb_equal(refsb, sb)) {
652 printk(KERN_WARNING "md: %s has same UUID"
653 " but different superblock to %s\n",
654 b, bdevname(refdev->bdev, b2));
655 goto abort;
656 }
657 ev1 = md_event(sb);
658 ev2 = md_event(refsb);
659 if (ev1 > ev2)
660 ret = 1;
661 else
662 ret = 0;
663 }
664 rdev->size = calc_dev_size(rdev, sb->chunk_size);
665
666 abort:
667 return ret;
668}
669
670/*
671 * validate_super for 0.90.0
672 */
673static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
674{
675 mdp_disk_t *desc;
676 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
677
41158c7e 678 rdev->raid_disk = -1;
b2d444d7 679 rdev->flags = 0;
1da177e4
LT		 680 if (mddev->raid_disks == 0) {
681 mddev->major_version = 0;
682 mddev->minor_version = sb->minor_version;
683 mddev->patch_version = sb->patch_version;
684 mddev->persistent = ! sb->not_persistent;
685 mddev->chunk_size = sb->chunk_size;
686 mddev->ctime = sb->ctime;
687 mddev->utime = sb->utime;
688 mddev->level = sb->level;
689 mddev->layout = sb->layout;
690 mddev->raid_disks = sb->raid_disks;
691 mddev->size = sb->size;
692 mddev->events = md_event(sb);
9223214e 693 mddev->bitmap_offset = 0;
36fa3063 694 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
1da177e4
LT		 695
696 if (sb->state & (1<<MD_SB_CLEAN))
697 mddev->recovery_cp = MaxSector;
698 else {
699 if (sb->events_hi == sb->cp_events_hi &&
700 sb->events_lo == sb->cp_events_lo) {
701 mddev->recovery_cp = sb->recovery_cp;
702 } else
703 mddev->recovery_cp = 0;
704 }
705
706 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
707 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
708 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
709 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
710
711 mddev->max_disks = MD_SB_DISKS;
a654b9d8
N		 712
713 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
714 mddev->bitmap_file == NULL) {
934ce7c8 715 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6) {
a654b9d8
N		 716 /* FIXME use a better test */
717 printk(KERN_WARNING "md: bitmaps only support for raid1\n");
718 return -EINVAL;
719 }
36fa3063 720 mddev->bitmap_offset = mddev->default_bitmap_offset;
a654b9d8
N		 721 }
722
41158c7e
N		 723 } else if (mddev->pers == NULL) {
724 /* Insist on good event counter while assembling */
725 __u64 ev1 = md_event(sb);
1da177e4
LT		 726 ++ev1;
727 if (ev1 < mddev->events)
728 return -EINVAL;
41158c7e
N		 729 } else if (mddev->bitmap) {
730 /* if adding to array with a bitmap, then we can accept an
731 * older device ... but not too old.
732 */
733 __u64 ev1 = md_event(sb);
734 if (ev1 < mddev->bitmap->events_cleared)
735 return 0;
736 } else /* just a hot-add of a new device, leave raid_disk at -1 */
737 return 0;
738
1da177e4 739 if (mddev->level != LEVEL_MULTIPATH) {
1da177e4
LT		 740 desc = sb->disks + rdev->desc_nr;
741
742 if (desc->state & (1<<MD_DISK_FAULTY))
b2d444d7 743 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 744 else if (desc->state & (1<<MD_DISK_SYNC) &&
745 desc->raid_disk < mddev->raid_disks) {
b2d444d7 746 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 747 rdev->raid_disk = desc->raid_disk;
748 }
8ddf9efe
N		 749 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
750 set_bit(WriteMostly, &rdev->flags);
41158c7e 751 } else /* MULTIPATH are always insync */
b2d444d7 752 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 753 return 0;
754}
755
756/*
757 * sync_super for 0.90.0
758 */
759static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
760{
761 mdp_super_t *sb;
762 struct list_head *tmp;
763 mdk_rdev_t *rdev2;
764 int next_spare = mddev->raid_disks;
19133a42 765
1da177e4
LT		 766
767 /* make rdev->sb match mddev data..
768 *
769 * 1/ zero out disks
770 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
771 * 3/ any empty disks < next_spare become removed
772 *
773 * disks[0] gets initialised to REMOVED because
774 * we cannot be sure from other fields if it has
775 * been initialised or not.
776 */
777 int i;
778 int active=0, working=0,failed=0,spare=0,nr_disks=0;
779
61181565
N		 780 rdev->sb_size = MD_SB_BYTES;
781
1da177e4
LT		 782 sb = (mdp_super_t*)page_address(rdev->sb_page);
783
784 memset(sb, 0, sizeof(*sb));
785
786 sb->md_magic = MD_SB_MAGIC;
787 sb->major_version = mddev->major_version;
788 sb->minor_version = mddev->minor_version;
789 sb->patch_version = mddev->patch_version;
790 sb->gvalid_words = 0; /* ignored */
791 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
792 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
793 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
794 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
795
796 sb->ctime = mddev->ctime;
797 sb->level = mddev->level;
798 sb->size = mddev->size;
799 sb->raid_disks = mddev->raid_disks;
800 sb->md_minor = mddev->md_minor;
801 sb->not_persistent = !mddev->persistent;
802 sb->utime = mddev->utime;
803 sb->state = 0;
804 sb->events_hi = (mddev->events>>32);
805 sb->events_lo = (u32)mddev->events;
806
807 if (mddev->in_sync)
808 {
809 sb->recovery_cp = mddev->recovery_cp;
810 sb->cp_events_hi = (mddev->events>>32);
811 sb->cp_events_lo = (u32)mddev->events;
812 if (mddev->recovery_cp == MaxSector)
813 sb->state = (1<< MD_SB_CLEAN);
814 } else
815 sb->recovery_cp = 0;
816
817 sb->layout = mddev->layout;
818 sb->chunk_size = mddev->chunk_size;
819
a654b9d8
N		 820 if (mddev->bitmap && mddev->bitmap_file == NULL)
821 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
822
1da177e4
LT		 823 sb->disks[0].state = (1<<MD_DISK_REMOVED);
824 ITERATE_RDEV(mddev,rdev2,tmp) {
825 mdp_disk_t *d;
86e6ffdd 826 int desc_nr;
b2d444d7
N		 827 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
828 && !test_bit(Faulty, &rdev2->flags))
86e6ffdd 829 desc_nr = rdev2->raid_disk;
1da177e4 830 else
86e6ffdd 831 desc_nr = next_spare++;
19133a42 832 rdev2->desc_nr = desc_nr;
1da177e4
LT		 833 d = &sb->disks[rdev2->desc_nr];
834 nr_disks++;
835 d->number = rdev2->desc_nr;
836 d->major = MAJOR(rdev2->bdev->bd_dev);
837 d->minor = MINOR(rdev2->bdev->bd_dev);
b2d444d7
N		 838 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
839 && !test_bit(Faulty, &rdev2->flags))
1da177e4
LT		 840 d->raid_disk = rdev2->raid_disk;
841 else
842 d->raid_disk = rdev2->desc_nr; /* compatibility */
b2d444d7 843 if (test_bit(Faulty, &rdev2->flags)) {
1da177e4
LT		 844 d->state = (1<<MD_DISK_FAULTY);
845 failed++;
b2d444d7 846 } else if (test_bit(In_sync, &rdev2->flags)) {
1da177e4
LT		 847 d->state = (1<<MD_DISK_ACTIVE);
848 d->state |= (1<<MD_DISK_SYNC);
849 active++;
850 working++;
851 } else {
852 d->state = 0;
853 spare++;
854 working++;
855 }
8ddf9efe
N		 856 if (test_bit(WriteMostly, &rdev2->flags))
857 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4 858 }
1da177e4
LT		 859 /* now set the "removed" and "faulty" bits on any missing devices */
860 for (i=0 ; i < mddev->raid_disks ; i++) {
861 mdp_disk_t *d = &sb->disks[i];
862 if (d->state == 0 && d->number == 0) {
863 d->number = i;
864 d->raid_disk = i;
865 d->state = (1<<MD_DISK_REMOVED);
866 d->state |= (1<<MD_DISK_FAULTY);
867 failed++;
868 }
869 }
870 sb->nr_disks = nr_disks;
871 sb->active_disks = active;
872 sb->working_disks = working;
873 sb->failed_disks = failed;
874 sb->spare_disks = spare;
875
876 sb->this_disk = sb->disks[rdev->desc_nr];
877 sb->sb_csum = calc_sb_csum(sb);
878}
879
880/*
881 * version 1 superblock
882 */
883
884static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
885{
886 unsigned int disk_csum, csum;
887 unsigned long long newcsum;
888 int size = 256 + le32_to_cpu(sb->max_dev)*2;
889 unsigned int *isuper = (unsigned int*)sb;
890 int i;
891
892 disk_csum = sb->sb_csum;
893 sb->sb_csum = 0;
894 newcsum = 0;
895 for (i=0; size>=4; size -= 4 )
896 newcsum += le32_to_cpu(*isuper++);
897
898 if (size == 2)
899 newcsum += le16_to_cpu(*(unsigned short*) isuper);
900
901 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
902 sb->sb_csum = disk_csum;
903 return cpu_to_le32(csum);
904}
905
906static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
907{
908 struct mdp_superblock_1 *sb;
909 int ret;
910 sector_t sb_offset;
911 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 912 int bmask;
1da177e4
LT		 913
914 /*
915 * Calculate the position of the superblock.
916 * It is always aligned to a 4K boundary and
917 * depeding on minor_version, it can be:
918 * 0: At least 8K, but less than 12K, from end of device
919 * 1: At start of device
920 * 2: 4K from start of device.
921 */
922 switch(minor_version) {
923 case 0:
924 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
925 sb_offset -= 8*2;
39730960 926 sb_offset &= ~(sector_t)(4*2-1);
1da177e4
LT		 927 /* convert from sectors to K */
928 sb_offset /= 2;
929 break;
930 case 1:
931 sb_offset = 0;
932 break;
933 case 2:
934 sb_offset = 4;
935 break;
936 default:
937 return -EINVAL;
938 }
939 rdev->sb_offset = sb_offset;
940
0002b271
N		 941 /* superblock is rarely larger than 1K, but it can be larger,
942 * and it is safe to read 4k, so we do that
943 */
944 ret = read_disk_sb(rdev, 4096);
1da177e4
LT		 945 if (ret) return ret;
946
947
948 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
949
950 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
951 sb->major_version != cpu_to_le32(1) ||
952 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
953 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
71c0805c 954 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT		 955 return -EINVAL;
956
957 if (calc_sb_1_csum(sb) != sb->sb_csum) {
958 printk("md: invalid superblock checksum on %s\n",
959 bdevname(rdev->bdev,b));
960 return -EINVAL;
961 }
962 if (le64_to_cpu(sb->data_size) < 10) {
963 printk("md: data_size too small on %s\n",
964 bdevname(rdev->bdev,b));
965 return -EINVAL;
966 }
967 rdev->preferred_minor = 0xffff;
968 rdev->data_offset = le64_to_cpu(sb->data_offset);
969
0002b271 970 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
720a3dc3 971 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
0002b271
N		 972 if (rdev->sb_size & bmask)
973 rdev-> sb_size = (rdev->sb_size | bmask)+1;
974
1da177e4
LT		 975 if (refdev == 0)
976 return 1;
977 else {
978 __u64 ev1, ev2;
979 struct mdp_superblock_1 *refsb =
980 (struct mdp_superblock_1*)page_address(refdev->sb_page);
981
982 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
983 sb->level != refsb->level ||
984 sb->layout != refsb->layout ||
985 sb->chunksize != refsb->chunksize) {
986 printk(KERN_WARNING "md: %s has strangely different"
987 " superblock to %s\n",
988 bdevname(rdev->bdev,b),
989 bdevname(refdev->bdev,b2));
990 return -EINVAL;
991 }
992 ev1 = le64_to_cpu(sb->events);
993 ev2 = le64_to_cpu(refsb->events);
994
995 if (ev1 > ev2)
996 return 1;
997 }
998 if (minor_version)
999 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1000 else
1001 rdev->size = rdev->sb_offset;
1002 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1003 return -EINVAL;
1004 rdev->size = le64_to_cpu(sb->data_size)/2;
1005 if (le32_to_cpu(sb->chunksize))
1006 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1007 return 0;
1008}
1009
1010static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1011{
1012 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1013
41158c7e 1014 rdev->raid_disk = -1;
b2d444d7 1015 rdev->flags = 0;
1da177e4
LT		 1016 if (mddev->raid_disks == 0) {
1017 mddev->major_version = 1;
1018 mddev->patch_version = 0;
1019 mddev->persistent = 1;
1020 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1021 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1022 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1023 mddev->level = le32_to_cpu(sb->level);
1024 mddev->layout = le32_to_cpu(sb->layout);
1025 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1026 mddev->size = le64_to_cpu(sb->size)/2;
1027 mddev->events = le64_to_cpu(sb->events);
9223214e 1028 mddev->bitmap_offset = 0;
36fa3063 1029 mddev->default_bitmap_offset = 0;
53e87fbb 1030 mddev->default_bitmap_offset = 1024;
1da177e4
LT		 1031
1032 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1033 memcpy(mddev->uuid, sb->set_uuid, 16);
1034
1035 mddev->max_disks = (4096-256)/2;
a654b9d8 1036
71c0805c 1037 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
a654b9d8
N		 1038 mddev->bitmap_file == NULL ) {
1039 if (mddev->level != 1) {
1040 printk(KERN_WARNING "md: bitmaps only supported for raid1\n");
1041 return -EINVAL;
1042 }
1043 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1044 }
41158c7e
N		 1045 } else if (mddev->pers == NULL) {
1046 /* Insist of good event counter while assembling */
1047 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4
LT		 1048 ++ev1;
1049 if (ev1 < mddev->events)
1050 return -EINVAL;
41158c7e
N		 1051 } else if (mddev->bitmap) {
1052 /* If adding to array with a bitmap, then we can accept an
1053 * older device, but not too old.
1054 */
1055 __u64 ev1 = le64_to_cpu(sb->events);
1056 if (ev1 < mddev->bitmap->events_cleared)
1057 return 0;
1058 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1059 return 0;
1da177e4
LT		 1060
1061 if (mddev->level != LEVEL_MULTIPATH) {
1062 int role;
1063 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1064 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1065 switch(role) {
1066 case 0xffff: /* spare */
1da177e4
LT		 1067 break;
1068 case 0xfffe: /* faulty */
b2d444d7 1069 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 1070 break;
1071 default:
b2d444d7 1072 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1073 rdev->raid_disk = role;
1074 break;
1075 }
8ddf9efe
N		 1076 if (sb->devflags & WriteMostly1)
1077 set_bit(WriteMostly, &rdev->flags);
41158c7e 1078 } else /* MULTIPATH are always insync */
b2d444d7 1079 set_bit(In_sync, &rdev->flags);
41158c7e 1080
1da177e4
LT		 1081 return 0;
1082}
1083
1084static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1085{
1086 struct mdp_superblock_1 *sb;
1087 struct list_head *tmp;
1088 mdk_rdev_t *rdev2;
1089 int max_dev, i;
1090 /* make rdev->sb match mddev and rdev data. */
1091
1092 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1093
1094 sb->feature_map = 0;
1095 sb->pad0 = 0;
1096 memset(sb->pad1, 0, sizeof(sb->pad1));
1097 memset(sb->pad2, 0, sizeof(sb->pad2));
1098 memset(sb->pad3, 0, sizeof(sb->pad3));
1099
1100 sb->utime = cpu_to_le64((__u64)mddev->utime);
1101 sb->events = cpu_to_le64(mddev->events);
1102 if (mddev->in_sync)
1103 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1104 else
1105 sb->resync_offset = cpu_to_le64(0);
1106
a654b9d8
N		 1107 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1108 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
71c0805c 1109 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8
N		 1110 }
1111
1da177e4
LT		 1112 max_dev = 0;
1113 ITERATE_RDEV(mddev,rdev2,tmp)
1114 if (rdev2->desc_nr+1 > max_dev)
1115 max_dev = rdev2->desc_nr+1;
1116
1117 sb->max_dev = cpu_to_le32(max_dev);
1118 for (i=0; i<max_dev;i++)
1119 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1120
1121 ITERATE_RDEV(mddev,rdev2,tmp) {
1122 i = rdev2->desc_nr;
b2d444d7 1123 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1124 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1125 else if (test_bit(In_sync, &rdev2->flags))
1da177e4
LT		 1126 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1127 else
1128 sb->dev_roles[i] = cpu_to_le16(0xffff);
1129 }
1130
1131 sb->recovery_offset = cpu_to_le64(0); /* not supported yet */
1132 sb->sb_csum = calc_sb_1_csum(sb);
1133}
1134
1135
75c96f85 1136static struct super_type super_types[] = {
1da177e4
LT		 1137 [0] = {
1138 .name = "0.90.0",
1139 .owner = THIS_MODULE,
1140 .load_super = super_90_load,
1141 .validate_super = super_90_validate,
1142 .sync_super = super_90_sync,
1143 },
1144 [1] = {
1145 .name = "md-1",
1146 .owner = THIS_MODULE,
1147 .load_super = super_1_load,
1148 .validate_super = super_1_validate,
1149 .sync_super = super_1_sync,
1150 },
1151};
1152
1153static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1154{
1155 struct list_head *tmp;
1156 mdk_rdev_t *rdev;
1157
1158 ITERATE_RDEV(mddev,rdev,tmp)
1159 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1160 return rdev;
1161
1162 return NULL;
1163}
1164
1165static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1166{
1167 struct list_head *tmp;
1168 mdk_rdev_t *rdev;
1169
1170 ITERATE_RDEV(mddev1,rdev,tmp)
1171 if (match_dev_unit(mddev2, rdev))
1172 return 1;
1173
1174 return 0;
1175}
1176
1177static LIST_HEAD(pending_raid_disks);
1178
1179static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1180{
1181 mdk_rdev_t *same_pdev;
1182 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1183
1184 if (rdev->mddev) {
1185 MD_BUG();
1186 return -EINVAL;
1187 }
1188 same_pdev = match_dev_unit(mddev, rdev);
1189 if (same_pdev)
1190 printk(KERN_WARNING
1191 "%s: WARNING: %s appears to be on the same physical"
1192 " disk as %s. True\n protection against single-disk"
1193 " failure might be compromised.\n",
1194 mdname(mddev), bdevname(rdev->bdev,b),
1195 bdevname(same_pdev->bdev,b2));
1196
1197 /* Verify rdev->desc_nr is unique.
1198 * If it is -1, assign a free number, else
1199 * check number is not in use
1200 */
1201 if (rdev->desc_nr < 0) {
1202 int choice = 0;
1203 if (mddev->pers) choice = mddev->raid_disks;
1204 while (find_rdev_nr(mddev, choice))
1205 choice++;
1206 rdev->desc_nr = choice;
1207 } else {
1208 if (find_rdev_nr(mddev, rdev->desc_nr))
1209 return -EBUSY;
1210 }
19133a42
N		 1211 bdevname(rdev->bdev,b);
1212 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1213 return -ENOMEM;
1da177e4
LT		 1214
1215 list_add(&rdev->same_set, &mddev->disks);
1216 rdev->mddev = mddev;
19133a42 1217 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 1218
9c791977 1219 rdev->kobj.parent = &mddev->kobj;
86e6ffdd
N		 1220 kobject_add(&rdev->kobj);
1221
1222 sysfs_create_link(&rdev->kobj, &rdev->bdev->bd_disk->kobj, "block");
1da177e4
LT		 1223 return 0;
1224}
1225
1226static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1227{
1228 char b[BDEVNAME_SIZE];
1229 if (!rdev->mddev) {
1230 MD_BUG();
1231 return;
1232 }
1233 list_del_init(&rdev->same_set);
1234 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1235 rdev->mddev = NULL;
86e6ffdd
N		 1236 sysfs_remove_link(&rdev->kobj, "block");
1237 kobject_del(&rdev->kobj);
1da177e4
LT		 1238}
1239
1240/*
1241 * prevent the device from being mounted, repartitioned or
1242 * otherwise reused by a RAID array (or any other kernel
1243 * subsystem), by bd_claiming the device.
1244 */
1245static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1246{
1247 int err = 0;
1248 struct block_device *bdev;
1249 char b[BDEVNAME_SIZE];
1250
1251 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1252 if (IS_ERR(bdev)) {
1253 printk(KERN_ERR "md: could not open %s.\n",
1254 __bdevname(dev, b));
1255 return PTR_ERR(bdev);
1256 }
1257 err = bd_claim(bdev, rdev);
1258 if (err) {
1259 printk(KERN_ERR "md: could not bd_claim %s.\n",
1260 bdevname(bdev, b));
1261 blkdev_put(bdev);
1262 return err;
1263 }
1264 rdev->bdev = bdev;
1265 return err;
1266}
1267
1268static void unlock_rdev(mdk_rdev_t *rdev)
1269{
1270 struct block_device *bdev = rdev->bdev;
1271 rdev->bdev = NULL;
1272 if (!bdev)
1273 MD_BUG();
1274 bd_release(bdev);
1275 blkdev_put(bdev);
1276}
1277
1278void md_autodetect_dev(dev_t dev);
1279
1280static void export_rdev(mdk_rdev_t * rdev)
1281{
1282 char b[BDEVNAME_SIZE];
1283 printk(KERN_INFO "md: export_rdev(%s)\n",
1284 bdevname(rdev->bdev,b));
1285 if (rdev->mddev)
1286 MD_BUG();
1287 free_disk_sb(rdev);
1288 list_del_init(&rdev->same_set);
1289#ifndef MODULE
1290 md_autodetect_dev(rdev->bdev->bd_dev);
1291#endif
1292 unlock_rdev(rdev);
86e6ffdd 1293 kobject_put(&rdev->kobj);
1da177e4
LT		 1294}
1295
1296static void kick_rdev_from_array(mdk_rdev_t * rdev)
1297{
1298 unbind_rdev_from_array(rdev);
1299 export_rdev(rdev);
1300}
1301
1302static void export_array(mddev_t *mddev)
1303{
1304 struct list_head *tmp;
1305 mdk_rdev_t *rdev;
1306
1307 ITERATE_RDEV(mddev,rdev,tmp) {
1308 if (!rdev->mddev) {
1309 MD_BUG();
1310 continue;
1311 }
1312 kick_rdev_from_array(rdev);
1313 }
1314 if (!list_empty(&mddev->disks))
1315 MD_BUG();
1316 mddev->raid_disks = 0;
1317 mddev->major_version = 0;
1318}
1319
1320static void print_desc(mdp_disk_t *desc)
1321{
1322 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1323 desc->major,desc->minor,desc->raid_disk,desc->state);
1324}
1325
1326static void print_sb(mdp_super_t *sb)
1327{
1328 int i;
1329
1330 printk(KERN_INFO
1331 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1332 sb->major_version, sb->minor_version, sb->patch_version,
1333 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1334 sb->ctime);
1335 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1336 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1337 sb->md_minor, sb->layout, sb->chunk_size);
1338 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1339 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1340 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1341 sb->failed_disks, sb->spare_disks,
1342 sb->sb_csum, (unsigned long)sb->events_lo);
1343
1344 printk(KERN_INFO);
1345 for (i = 0; i < MD_SB_DISKS; i++) {
1346 mdp_disk_t *desc;
1347
1348 desc = sb->disks + i;
1349 if (desc->number || desc->major || desc->minor ||
1350 desc->raid_disk || (desc->state && (desc->state != 4))) {
1351 printk(" D %2d: ", i);
1352 print_desc(desc);
1353 }
1354 }
1355 printk(KERN_INFO "md: THIS: ");
1356 print_desc(&sb->this_disk);
1357
1358}
1359
1360static void print_rdev(mdk_rdev_t *rdev)
1361{
1362 char b[BDEVNAME_SIZE];
1363 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1364 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
b2d444d7
N		 1365 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1366 rdev->desc_nr);
1da177e4
LT		 1367 if (rdev->sb_loaded) {
1368 printk(KERN_INFO "md: rdev superblock:\n");
1369 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1370 } else
1371 printk(KERN_INFO "md: no rdev superblock!\n");
1372}
1373
1374void md_print_devices(void)
1375{
1376 struct list_head *tmp, *tmp2;
1377 mdk_rdev_t *rdev;
1378 mddev_t *mddev;
1379 char b[BDEVNAME_SIZE];
1380
1381 printk("\n");
1382 printk("md: **********************************\n");
1383 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1384 printk("md: **********************************\n");
1385 ITERATE_MDDEV(mddev,tmp) {
1da177e4 1386
32a7627c
N		 1387 if (mddev->bitmap)
1388 bitmap_print_sb(mddev->bitmap);
1389 else
1390 printk("%s: ", mdname(mddev));
1da177e4
LT		 1391 ITERATE_RDEV(mddev,rdev,tmp2)
1392 printk("<%s>", bdevname(rdev->bdev,b));
1393 printk("\n");
1394
1395 ITERATE_RDEV(mddev,rdev,tmp2)
1396 print_rdev(rdev);
1397 }
1398 printk("md: **********************************\n");
1399 printk("\n");
1400}
1401
1402
1da177e4
LT		 1403static void sync_sbs(mddev_t * mddev)
1404{
1405 mdk_rdev_t *rdev;
1406 struct list_head *tmp;
1407
1408 ITERATE_RDEV(mddev,rdev,tmp) {
1409 super_types[mddev->major_version].
1410 sync_super(mddev, rdev);
1411 rdev->sb_loaded = 1;
1412 }
1413}
1414
1415static void md_update_sb(mddev_t * mddev)
1416{
7bfa19f2 1417 int err;
1da177e4
LT		 1418 struct list_head *tmp;
1419 mdk_rdev_t *rdev;
06d91a5f 1420 int sync_req;
1da177e4 1421
1da177e4 1422repeat:
a9701a30 1423 spin_lock_irq(&mddev->write_lock);
06d91a5f 1424 sync_req = mddev->in_sync;
1da177e4
LT		 1425 mddev->utime = get_seconds();
1426 mddev->events ++;
1427
1428 if (!mddev->events) {
1429 /*
1430 * oops, this 64-bit counter should never wrap.
1431 * Either we are in around ~1 trillion A.C., assuming
1432 * 1 reboot per second, or we have a bug:
1433 */
1434 MD_BUG();
1435 mddev->events --;
1436 }
7bfa19f2 1437 mddev->sb_dirty = 2;
1da177e4
LT		 1438 sync_sbs(mddev);
1439
1440 /*
1441 * do not write anything to disk if using
1442 * nonpersistent superblocks
1443 */
06d91a5f
N		 1444 if (!mddev->persistent) {
1445 mddev->sb_dirty = 0;
a9701a30 1446 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1447 wake_up(&mddev->sb_wait);
1da177e4 1448 return;
06d91a5f 1449 }
a9701a30 1450 spin_unlock_irq(&mddev->write_lock);
1da177e4
LT		 1451
1452 dprintk(KERN_INFO
1453 "md: updating %s RAID superblock on device (in sync %d)\n",
1454 mdname(mddev),mddev->in_sync);
1455
32a7627c 1456 err = bitmap_update_sb(mddev->bitmap);
1da177e4
LT		 1457 ITERATE_RDEV(mddev,rdev,tmp) {
1458 char b[BDEVNAME_SIZE];
1459 dprintk(KERN_INFO "md: ");
b2d444d7 1460 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1461 dprintk("(skipping faulty ");
1462
1463 dprintk("%s ", bdevname(rdev->bdev,b));
b2d444d7 1464 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 1465 md_super_write(mddev,rdev,
0002b271 1466 rdev->sb_offset<<1, rdev->sb_size,
7bfa19f2
N		 1467 rdev->sb_page);
1468 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1469 bdevname(rdev->bdev,b),
1470 (unsigned long long)rdev->sb_offset);
1471
1da177e4
LT		 1472 } else
1473 dprintk(")\n");
7bfa19f2 1474 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT		 1475 /* only need to write one superblock... */
1476 break;
1477 }
a9701a30 1478 md_super_wait(mddev);
7bfa19f2
N		 1479 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1480
a9701a30 1481 spin_lock_irq(&mddev->write_lock);
7bfa19f2 1482 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
06d91a5f 1483 /* have to write it out again */
a9701a30 1484 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N		 1485 goto repeat;
1486 }
1487 mddev->sb_dirty = 0;
a9701a30 1488 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1489 wake_up(&mddev->sb_wait);
06d91a5f 1490
1da177e4
LT		 1491}
1492
86e6ffdd
N		 1493struct rdev_sysfs_entry {
1494 struct attribute attr;
1495 ssize_t (*show)(mdk_rdev_t *, char *);
1496 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1497};
1498
1499static ssize_t
1500rdev_show_state(mdk_rdev_t *rdev, char *page)
1501{
1502 char *sep = "";
1503 int len=0;
1504
b2d444d7 1505 if (test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 1506 len+= sprintf(page+len, "%sfaulty",sep);
1507 sep = ",";
1508 }
b2d444d7 1509 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1510 len += sprintf(page+len, "%sin_sync",sep);
1511 sep = ",";
1512 }
b2d444d7
N		 1513 if (!test_bit(Faulty, &rdev->flags) &&
1514 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1515 len += sprintf(page+len, "%sspare", sep);
1516 sep = ",";
1517 }
1518 return len+sprintf(page+len, "\n");
1519}
1520
1521static struct rdev_sysfs_entry rdev_state = {
1522 .attr = {.name = "state", .mode = S_IRUGO },
1523 .show = rdev_show_state,
1524};
1525
1526static ssize_t
1527rdev_show_super(mdk_rdev_t *rdev, char *page)
1528{
1529 if (rdev->sb_loaded && rdev->sb_size) {
1530 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1531 return rdev->sb_size;
1532 } else
1533 return 0;
1534}
1535static struct rdev_sysfs_entry rdev_super = {
1536 .attr = {.name = "super", .mode = S_IRUGO },
1537 .show = rdev_show_super,
1538};
1539static struct attribute *rdev_default_attrs[] = {
1540 &rdev_state.attr,
1541 &rdev_super.attr,
1542 NULL,
1543};
1544static ssize_t
1545rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1546{
1547 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1548 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1549
1550 if (!entry->show)
1551 return -EIO;
1552 return entry->show(rdev, page);
1553}
1554
1555static ssize_t
1556rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1557 const char *page, size_t length)
1558{
1559 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1560 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1561
1562 if (!entry->store)
1563 return -EIO;
1564 return entry->store(rdev, page, length);
1565}
1566
1567static void rdev_free(struct kobject *ko)
1568{
1569 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1570 kfree(rdev);
1571}
1572static struct sysfs_ops rdev_sysfs_ops = {
1573 .show = rdev_attr_show,
1574 .store = rdev_attr_store,
1575};
1576static struct kobj_type rdev_ktype = {
1577 .release = rdev_free,
1578 .sysfs_ops = &rdev_sysfs_ops,
1579 .default_attrs = rdev_default_attrs,
1580};
1581
1da177e4
LT		 1582/*
1583 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1584 *
1585 * mark the device faulty if:
1586 *
1587 * - the device is nonexistent (zero size)
1588 * - the device has no valid superblock
1589 *
1590 * a faulty rdev _never_ has rdev->sb set.
1591 */
1592static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1593{
1594 char b[BDEVNAME_SIZE];
1595 int err;
1596 mdk_rdev_t *rdev;
1597 sector_t size;
1598
1599 rdev = (mdk_rdev_t *) kmalloc(sizeof(*rdev), GFP_KERNEL);
1600 if (!rdev) {
1601 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1602 return ERR_PTR(-ENOMEM);
1603 }
1604 memset(rdev, 0, sizeof(*rdev));
1605
1606 if ((err = alloc_disk_sb(rdev)))
1607 goto abort_free;
1608
1609 err = lock_rdev(rdev, newdev);
1610 if (err)
1611 goto abort_free;
1612
86e6ffdd
N		 1613 rdev->kobj.parent = NULL;
1614 rdev->kobj.ktype = &rdev_ktype;
1615 kobject_init(&rdev->kobj);
1616
1da177e4 1617 rdev->desc_nr = -1;
b2d444d7 1618 rdev->flags = 0;
1da177e4
LT		 1619 rdev->data_offset = 0;
1620 atomic_set(&rdev->nr_pending, 0);
ba22dcbf 1621 atomic_set(&rdev->read_errors, 0);
1da177e4
LT		 1622
1623 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
1624 if (!size) {
1625 printk(KERN_WARNING
1626 "md: %s has zero or unknown size, marking faulty!\n",
1627 bdevname(rdev->bdev,b));
1628 err = -EINVAL;
1629 goto abort_free;
1630 }
1631
1632 if (super_format >= 0) {
1633 err = super_types[super_format].
1634 load_super(rdev, NULL, super_minor);
1635 if (err == -EINVAL) {
1636 printk(KERN_WARNING
1637 "md: %s has invalid sb, not importing!\n",
1638 bdevname(rdev->bdev,b));
1639 goto abort_free;
1640 }
1641 if (err < 0) {
1642 printk(KERN_WARNING
1643 "md: could not read %s's sb, not importing!\n",
1644 bdevname(rdev->bdev,b));
1645 goto abort_free;
1646 }
1647 }
1648 INIT_LIST_HEAD(&rdev->same_set);
1649
1650 return rdev;
1651
1652abort_free:
1653 if (rdev->sb_page) {
1654 if (rdev->bdev)
1655 unlock_rdev(rdev);
1656 free_disk_sb(rdev);
1657 }
1658 kfree(rdev);
1659 return ERR_PTR(err);
1660}
1661
1662/*
1663 * Check a full RAID array for plausibility
1664 */
1665
1666
a757e64c 1667static void analyze_sbs(mddev_t * mddev)
1da177e4
LT		 1668{
1669 int i;
1670 struct list_head *tmp;
1671 mdk_rdev_t *rdev, *freshest;
1672 char b[BDEVNAME_SIZE];
1673
1674 freshest = NULL;
1675 ITERATE_RDEV(mddev,rdev,tmp)
1676 switch (super_types[mddev->major_version].
1677 load_super(rdev, freshest, mddev->minor_version)) {
1678 case 1:
1679 freshest = rdev;
1680 break;
1681 case 0:
1682 break;
1683 default:
1684 printk( KERN_ERR \
1685 "md: fatal superblock inconsistency in %s"
1686 " -- removing from array\n",
1687 bdevname(rdev->bdev,b));
1688 kick_rdev_from_array(rdev);
1689 }
1690
1691
1692 super_types[mddev->major_version].
1693 validate_super(mddev, freshest);
1694
1695 i = 0;
1696 ITERATE_RDEV(mddev,rdev,tmp) {
1697 if (rdev != freshest)
1698 if (super_types[mddev->major_version].
1699 validate_super(mddev, rdev)) {
1700 printk(KERN_WARNING "md: kicking non-fresh %s"
1701 " from array!\n",
1702 bdevname(rdev->bdev,b));
1703 kick_rdev_from_array(rdev);
1704 continue;
1705 }
1706 if (mddev->level == LEVEL_MULTIPATH) {
1707 rdev->desc_nr = i++;
1708 rdev->raid_disk = rdev->desc_nr;
b2d444d7 1709 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1710 }
1711 }
1712
1713
1714
1715 if (mddev->recovery_cp != MaxSector &&
1716 mddev->level >= 1)
1717 printk(KERN_ERR "md: %s: raid array is not clean"
1718 " -- starting background reconstruction\n",
1719 mdname(mddev));
1720
1da177e4
LT		 1721}
1722
eae1701f
N		 1723static ssize_t
1724md_show_level(mddev_t *mddev, char *page)
1725{
1726 mdk_personality_t *p = mddev->pers;
1727 if (p == NULL)
1728 return 0;
1729 if (mddev->level >= 0)
1730 return sprintf(page, "RAID-%d\n", mddev->level);
1731 else
1732 return sprintf(page, "%s\n", p->name);
1733}
1734
1735static struct md_sysfs_entry md_level = {
1736 .attr = {.name = "level", .mode = S_IRUGO },
1737 .show = md_show_level,
1738};
1739
1740static ssize_t
1741md_show_rdisks(mddev_t *mddev, char *page)
1742{
1743 return sprintf(page, "%d\n", mddev->raid_disks);
1744}
1745
1746static struct md_sysfs_entry md_raid_disks = {
1747 .attr = {.name = "raid_disks", .mode = S_IRUGO },
1748 .show = md_show_rdisks,
1749};
1750
24dd469d
N		 1751static ssize_t
1752md_show_scan(mddev_t *mddev, char *page)
1753{
1754 char *type = "none";
31399d9e
N		 1755 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
1756 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
1757 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N		 1758 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
1759 type = "resync";
1760 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
1761 type = "check";
1762 else
1763 type = "repair";
1764 } else
1765 type = "recover";
1766 }
1767 return sprintf(page, "%s\n", type);
1768}
1769
1770static ssize_t
1771md_store_scan(mddev_t *mddev, const char *page, size_t len)
1772{
1773 int canscan=0;
31399d9e
N		 1774
1775 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
1776 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d
N		 1777 return -EBUSY;
1778 down(&mddev->reconfig_sem);
1779 if (mddev->pers && mddev->pers->sync_request)
1780 canscan=1;
1781 up(&mddev->reconfig_sem);
1782 if (!canscan)
1783 return -EINVAL;
1784
1785 if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0)
1786 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
1787 else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0)
1788 return -EINVAL;
1789 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
1790 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
1791 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
1792 md_wakeup_thread(mddev->thread);
1793 return len;
1794}
1795
9d88883e
N		 1796static ssize_t
1797md_show_mismatch(mddev_t *mddev, char *page)
1798{
1799 return sprintf(page, "%llu\n",
1800 (unsigned long long) mddev->resync_mismatches);
1801}
1802
24dd469d
N		 1803static struct md_sysfs_entry md_scan_mode = {
1804 .attr = {.name = "scan_mode", .mode = S_IRUGO|S_IWUSR },
1805 .show = md_show_scan,
1806 .store = md_store_scan,
1807};
1808
9d88883e
N		 1809static struct md_sysfs_entry md_mismatches = {
1810 .attr = {.name = "mismatch_cnt", .mode = S_IRUGO },
1811 .show = md_show_mismatch,
1812};
1813
eae1701f
N		 1814static struct attribute *md_default_attrs[] = {
1815 &md_level.attr,
1816 &md_raid_disks.attr,
24dd469d 1817 &md_scan_mode.attr,
9d88883e 1818 &md_mismatches.attr,
eae1701f
N		 1819 NULL,
1820};
1821
1822static ssize_t
1823md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1824{
1825 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
1826 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
1827
1828 if (!entry->show)
1829 return -EIO;
1830 return entry->show(mddev, page);
1831}
1832
1833static ssize_t
1834md_attr_store(struct kobject *kobj, struct attribute *attr,
1835 const char *page, size_t length)
1836{
1837 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
1838 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
1839
1840 if (!entry->store)
1841 return -EIO;
1842 return entry->store(mddev, page, length);
1843}
1844
1845static void md_free(struct kobject *ko)
1846{
1847 mddev_t *mddev = container_of(ko, mddev_t, kobj);
1848 kfree(mddev);
1849}
1850
1851static struct sysfs_ops md_sysfs_ops = {
1852 .show = md_attr_show,
1853 .store = md_attr_store,
1854};
1855static struct kobj_type md_ktype = {
1856 .release = md_free,
1857 .sysfs_ops = &md_sysfs_ops,
1858 .default_attrs = md_default_attrs,
1859};
1860
1da177e4
LT		 1861int mdp_major = 0;
1862
1863static struct kobject *md_probe(dev_t dev, int *part, void *data)
1864{
1865 static DECLARE_MUTEX(disks_sem);
1866 mddev_t *mddev = mddev_find(dev);
1867 struct gendisk *disk;
1868 int partitioned = (MAJOR(dev) != MD_MAJOR);
1869 int shift = partitioned ? MdpMinorShift : 0;
1870 int unit = MINOR(dev) >> shift;
1871
1872 if (!mddev)
1873 return NULL;
1874
1875 down(&disks_sem);
1876 if (mddev->gendisk) {
1877 up(&disks_sem);
1878 mddev_put(mddev);
1879 return NULL;
1880 }
1881 disk = alloc_disk(1 << shift);
1882 if (!disk) {
1883 up(&disks_sem);
1884 mddev_put(mddev);
1885 return NULL;
1886 }
1887 disk->major = MAJOR(dev);
1888 disk->first_minor = unit << shift;
1889 if (partitioned) {
1890 sprintf(disk->disk_name, "md_d%d", unit);
1891 sprintf(disk->devfs_name, "md/d%d", unit);
1892 } else {
1893 sprintf(disk->disk_name, "md%d", unit);
1894 sprintf(disk->devfs_name, "md/%d", unit);
1895 }
1896 disk->fops = &md_fops;
1897 disk->private_data = mddev;
1898 disk->queue = mddev->queue;
1899 add_disk(disk);
1900 mddev->gendisk = disk;
1901 up(&disks_sem);
9c791977 1902 mddev->kobj.parent = &disk->kobj;
eae1701f
N		 1903 mddev->kobj.k_name = NULL;
1904 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
1905 mddev->kobj.ktype = &md_ktype;
1906 kobject_register(&mddev->kobj);
1da177e4
LT		 1907 return NULL;
1908}
1909
1910void md_wakeup_thread(mdk_thread_t *thread);
1911
1912static void md_safemode_timeout(unsigned long data)
1913{
1914 mddev_t *mddev = (mddev_t *) data;
1915
1916 mddev->safemode = 1;
1917 md_wakeup_thread(mddev->thread);
1918}
1919
1920
1921static int do_md_run(mddev_t * mddev)
1922{
1923 int pnum, err;
1924 int chunk_size;
1925 struct list_head *tmp;
1926 mdk_rdev_t *rdev;
1927 struct gendisk *disk;
1928 char b[BDEVNAME_SIZE];
1929
a757e64c
N		 1930 if (list_empty(&mddev->disks))
1931 /* cannot run an array with no devices.. */
1da177e4 1932 return -EINVAL;
1da177e4
LT		 1933
1934 if (mddev->pers)
1935 return -EBUSY;
1936
1937 /*
1938 * Analyze all RAID superblock(s)
1939 */
a757e64c
N		 1940 if (!mddev->raid_disks)
1941 analyze_sbs(mddev);
1da177e4
LT		 1942
1943 chunk_size = mddev->chunk_size;
1944 pnum = level_to_pers(mddev->level);
1945
1946 if ((pnum != MULTIPATH) && (pnum != RAID1)) {
1947 if (!chunk_size) {
1948 /*
1949 * 'default chunksize' in the old md code used to
1950 * be PAGE_SIZE, baaad.
1951 * we abort here to be on the safe side. We don't
1952 * want to continue the bad practice.
1953 */
1954 printk(KERN_ERR
1955 "no chunksize specified, see 'man raidtab'\n");
1956 return -EINVAL;
1957 }
1958 if (chunk_size > MAX_CHUNK_SIZE) {
1959 printk(KERN_ERR "too big chunk_size: %d > %d\n",
1960 chunk_size, MAX_CHUNK_SIZE);
1961 return -EINVAL;
1962 }
1963 /*
1964 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
1965 */
1966 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 1967 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 1968 return -EINVAL;
1969 }
1970 if (chunk_size < PAGE_SIZE) {
1971 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
1972 chunk_size, PAGE_SIZE);
1973 return -EINVAL;
1974 }
1975
1976 /* devices must have minimum size of one chunk */
1977 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 1978 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1979 continue;
1980 if (rdev->size < chunk_size / 1024) {
1981 printk(KERN_WARNING
1982 "md: Dev %s smaller than chunk_size:"
1983 " %lluk < %dk\n",
1984 bdevname(rdev->bdev,b),
1985 (unsigned long long)rdev->size,
1986 chunk_size / 1024);
1987 return -EINVAL;
1988 }
1989 }
1990 }
1991
1da177e4
LT		 1992#ifdef CONFIG_KMOD
1993 if (!pers[pnum])
1994 {
1995 request_module("md-personality-%d", pnum);
1996 }
1997#endif
1998
1999 /*
2000 * Drop all container device buffers, from now on
2001 * the only valid external interface is through the md
2002 * device.
2003 * Also find largest hardsector size
2004 */
2005 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2006 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2007 continue;
2008 sync_blockdev(rdev->bdev);
2009 invalidate_bdev(rdev->bdev, 0);
2010 }
2011
2012 md_probe(mddev->unit, NULL, NULL);
2013 disk = mddev->gendisk;
2014 if (!disk)
2015 return -ENOMEM;
2016
2017 spin_lock(&pers_lock);
2018 if (!pers[pnum] || !try_module_get(pers[pnum]->owner)) {
2019 spin_unlock(&pers_lock);
2020 printk(KERN_WARNING "md: personality %d is not loaded!\n",
2021 pnum);
2022 return -EINVAL;
2023 }
2024
2025 mddev->pers = pers[pnum];
2026 spin_unlock(&pers_lock);
2027
657390d2 2028 mddev->recovery = 0;
1da177e4 2029 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 2030 mddev->barriers_work = 1;
1da177e4 2031
32a7627c
N		 2032 /* before we start the array running, initialise the bitmap */
2033 err = bitmap_create(mddev);
2034 if (err)
2035 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
2036 mdname(mddev), err);
2037 else
2038 err = mddev->pers->run(mddev);
1da177e4
LT		 2039 if (err) {
2040 printk(KERN_ERR "md: pers->run() failed ...\n");
2041 module_put(mddev->pers->owner);
2042 mddev->pers = NULL;
32a7627c
N		 2043 bitmap_destroy(mddev);
2044 return err;
1da177e4
LT		 2045 }
2046 atomic_set(&mddev->writes_pending,0);
2047 mddev->safemode = 0;
2048 mddev->safemode_timer.function = md_safemode_timeout;
2049 mddev->safemode_timer.data = (unsigned long) mddev;
2050 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */
2051 mddev->in_sync = 1;
86e6ffdd
N		 2052
2053 ITERATE_RDEV(mddev,rdev,tmp)
2054 if (rdev->raid_disk >= 0) {
2055 char nm[20];
2056 sprintf(nm, "rd%d", rdev->raid_disk);
2057 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2058 }
1da177e4
LT		 2059
2060 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 2061 md_wakeup_thread(mddev->thread);
1da177e4
LT		 2062
2063 if (mddev->sb_dirty)
2064 md_update_sb(mddev);
2065
2066 set_capacity(disk, mddev->array_size<<1);
2067
2068 /* If we call blk_queue_make_request here, it will
2069 * re-initialise max_sectors etc which may have been
2070 * refined inside -> run. So just set the bits we need to set.
2071 * Most initialisation happended when we called
2072 * blk_queue_make_request(..., md_fail_request)
2073 * earlier.
2074 */
2075 mddev->queue->queuedata = mddev;
2076 mddev->queue->make_request_fn = mddev->pers->make_request;
2077
2078 mddev->changed = 1;
2079 return 0;
2080}
2081
2082static int restart_array(mddev_t *mddev)
2083{
2084 struct gendisk *disk = mddev->gendisk;
2085 int err;
2086
2087 /*
2088 * Complain if it has no devices
2089 */
2090 err = -ENXIO;
2091 if (list_empty(&mddev->disks))
2092 goto out;
2093
2094 if (mddev->pers) {
2095 err = -EBUSY;
2096 if (!mddev->ro)
2097 goto out;
2098
2099 mddev->safemode = 0;
2100 mddev->ro = 0;
2101 set_disk_ro(disk, 0);
2102
2103 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2104 mdname(mddev));
2105 /*
2106 * Kick recovery or resync if necessary
2107 */
2108 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2109 md_wakeup_thread(mddev->thread);
2110 err = 0;
2111 } else {
2112 printk(KERN_ERR "md: %s has no personality assigned.\n",
2113 mdname(mddev));
2114 err = -EINVAL;
2115 }
2116
2117out:
2118 return err;
2119}
2120
2121static int do_md_stop(mddev_t * mddev, int ro)
2122{
2123 int err = 0;
2124 struct gendisk *disk = mddev->gendisk;
2125
2126 if (mddev->pers) {
2127 if (atomic_read(&mddev->active)>2) {
2128 printk("md: %s still in use.\n",mdname(mddev));
2129 return -EBUSY;
2130 }
2131
2132 if (mddev->sync_thread) {
2133 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2134 md_unregister_thread(mddev->sync_thread);
2135 mddev->sync_thread = NULL;
2136 }
2137
2138 del_timer_sync(&mddev->safemode_timer);
2139
2140 invalidate_partition(disk, 0);
2141
2142 if (ro) {
2143 err = -ENXIO;
2144 if (mddev->ro)
2145 goto out;
2146 mddev->ro = 1;
2147 } else {
6b8b3e8a 2148 bitmap_flush(mddev);
a9701a30 2149 md_super_wait(mddev);
1da177e4
LT		 2150 if (mddev->ro)
2151 set_disk_ro(disk, 0);
2152 blk_queue_make_request(mddev->queue, md_fail_request);
2153 mddev->pers->stop(mddev);
2154 module_put(mddev->pers->owner);
2155 mddev->pers = NULL;
2156 if (mddev->ro)
2157 mddev->ro = 0;
2158 }
2159 if (!mddev->in_sync) {
2160 /* mark array as shutdown cleanly */
2161 mddev->in_sync = 1;
2162 md_update_sb(mddev);
2163 }
2164 if (ro)
2165 set_disk_ro(disk, 1);
2166 }
32a7627c
N		 2167
2168 bitmap_destroy(mddev);
2169 if (mddev->bitmap_file) {
2170 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
2171 fput(mddev->bitmap_file);
2172 mddev->bitmap_file = NULL;
2173 }
9223214e 2174 mddev->bitmap_offset = 0;
32a7627c 2175
1da177e4
LT		 2176 /*
2177 * Free resources if final stop
2178 */
2179 if (!ro) {
86e6ffdd
N		 2180 mdk_rdev_t *rdev;
2181 struct list_head *tmp;
1da177e4
LT		 2182 struct gendisk *disk;
2183 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
2184
86e6ffdd
N		 2185 ITERATE_RDEV(mddev,rdev,tmp)
2186 if (rdev->raid_disk >= 0) {
2187 char nm[20];
2188 sprintf(nm, "rd%d", rdev->raid_disk);
2189 sysfs_remove_link(&mddev->kobj, nm);
2190 }
2191
1da177e4
LT		 2192 export_array(mddev);
2193
2194 mddev->array_size = 0;
2195 disk = mddev->gendisk;
2196 if (disk)
2197 set_capacity(disk, 0);
2198 mddev->changed = 1;
2199 } else
2200 printk(KERN_INFO "md: %s switched to read-only mode.\n",
2201 mdname(mddev));
2202 err = 0;
2203out:
2204 return err;
2205}
2206
2207static void autorun_array(mddev_t *mddev)
2208{
2209 mdk_rdev_t *rdev;
2210 struct list_head *tmp;
2211 int err;
2212
a757e64c 2213 if (list_empty(&mddev->disks))
1da177e4 2214 return;
1da177e4
LT		 2215
2216 printk(KERN_INFO "md: running: ");
2217
2218 ITERATE_RDEV(mddev,rdev,tmp) {
2219 char b[BDEVNAME_SIZE];
2220 printk("<%s>", bdevname(rdev->bdev,b));
2221 }
2222 printk("\n");
2223
2224 err = do_md_run (mddev);
2225 if (err) {
2226 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
2227 do_md_stop (mddev, 0);
2228 }
2229}
2230
2231/*
2232 * lets try to run arrays based on all disks that have arrived
2233 * until now. (those are in pending_raid_disks)
2234 *
2235 * the method: pick the first pending disk, collect all disks with
2236 * the same UUID, remove all from the pending list and put them into
2237 * the 'same_array' list. Then order this list based on superblock
2238 * update time (freshest comes first), kick out 'old' disks and
2239 * compare superblocks. If everything's fine then run it.
2240 *
2241 * If "unit" is allocated, then bump its reference count
2242 */
2243static void autorun_devices(int part)
2244{
2245 struct list_head candidates;
2246 struct list_head *tmp;
2247 mdk_rdev_t *rdev0, *rdev;
2248 mddev_t *mddev;
2249 char b[BDEVNAME_SIZE];
2250
2251 printk(KERN_INFO "md: autorun ...\n");
2252 while (!list_empty(&pending_raid_disks)) {
2253 dev_t dev;
2254 rdev0 = list_entry(pending_raid_disks.next,
2255 mdk_rdev_t, same_set);
2256
2257 printk(KERN_INFO "md: considering %s ...\n",
2258 bdevname(rdev0->bdev,b));
2259 INIT_LIST_HEAD(&candidates);
2260 ITERATE_RDEV_PENDING(rdev,tmp)
2261 if (super_90_load(rdev, rdev0, 0) >= 0) {
2262 printk(KERN_INFO "md: adding %s ...\n",
2263 bdevname(rdev->bdev,b));
2264 list_move(&rdev->same_set, &candidates);
2265 }
2266 /*
2267 * now we have a set of devices, with all of them having
2268 * mostly sane superblocks. It's time to allocate the
2269 * mddev.
2270 */
2271 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
2272 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
2273 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
2274 break;
2275 }
2276 if (part)
2277 dev = MKDEV(mdp_major,
2278 rdev0->preferred_minor << MdpMinorShift);
2279 else
2280 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
2281
2282 md_probe(dev, NULL, NULL);
2283 mddev = mddev_find(dev);
2284 if (!mddev) {
2285 printk(KERN_ERR
2286 "md: cannot allocate memory for md drive.\n");
2287 break;
2288 }
2289 if (mddev_lock(mddev))
2290 printk(KERN_WARNING "md: %s locked, cannot run\n",
2291 mdname(mddev));
2292 else if (mddev->raid_disks || mddev->major_version
2293 || !list_empty(&mddev->disks)) {
2294 printk(KERN_WARNING
2295 "md: %s already running, cannot run %s\n",
2296 mdname(mddev), bdevname(rdev0->bdev,b));
2297 mddev_unlock(mddev);
2298 } else {
2299 printk(KERN_INFO "md: created %s\n", mdname(mddev));
2300 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
2301 list_del_init(&rdev->same_set);
2302 if (bind_rdev_to_array(rdev, mddev))
2303 export_rdev(rdev);
2304 }
2305 autorun_array(mddev);
2306 mddev_unlock(mddev);
2307 }
2308 /* on success, candidates will be empty, on error
2309 * it won't...
2310 */
2311 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
2312 export_rdev(rdev);
2313 mddev_put(mddev);
2314 }
2315 printk(KERN_INFO "md: ... autorun DONE.\n");
2316}
2317
2318/*
2319 * import RAID devices based on one partition
2320 * if possible, the array gets run as well.
2321 */
2322
2323static int autostart_array(dev_t startdev)
2324{
2325 char b[BDEVNAME_SIZE];
2326 int err = -EINVAL, i;
2327 mdp_super_t *sb = NULL;
2328 mdk_rdev_t *start_rdev = NULL, *rdev;
2329
2330 start_rdev = md_import_device(startdev, 0, 0);
2331 if (IS_ERR(start_rdev))
2332 return err;
2333
2334
2335 /* NOTE: this can only work for 0.90.0 superblocks */
2336 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
2337 if (sb->major_version != 0 ||
2338 sb->minor_version != 90 ) {
2339 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
2340 export_rdev(start_rdev);
2341 return err;
2342 }
2343
b2d444d7 2344 if (test_bit(Faulty, &start_rdev->flags)) {
1da177e4
LT		 2345 printk(KERN_WARNING
2346 "md: can not autostart based on faulty %s!\n",
2347 bdevname(start_rdev->bdev,b));
2348 export_rdev(start_rdev);
2349 return err;
2350 }
2351 list_add(&start_rdev->same_set, &pending_raid_disks);
2352
2353 for (i = 0; i < MD_SB_DISKS; i++) {
2354 mdp_disk_t *desc = sb->disks + i;
2355 dev_t dev = MKDEV(desc->major, desc->minor);
2356
2357 if (!dev)
2358 continue;
2359 if (dev == startdev)
2360 continue;
2361 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
2362 continue;
2363 rdev = md_import_device(dev, 0, 0);
2364 if (IS_ERR(rdev))
2365 continue;
2366
2367 list_add(&rdev->same_set, &pending_raid_disks);
2368 }
2369
2370 /*
2371 * possibly return codes
2372 */
2373 autorun_devices(0);
2374 return 0;
2375
2376}
2377
2378
2379static int get_version(void __user * arg)
2380{
2381 mdu_version_t ver;
2382
2383 ver.major = MD_MAJOR_VERSION;
2384 ver.minor = MD_MINOR_VERSION;
2385 ver.patchlevel = MD_PATCHLEVEL_VERSION;
2386
2387 if (copy_to_user(arg, &ver, sizeof(ver)))
2388 return -EFAULT;
2389
2390 return 0;
2391}
2392
2393static int get_array_info(mddev_t * mddev, void __user * arg)
2394{
2395 mdu_array_info_t info;
2396 int nr,working,active,failed,spare;
2397 mdk_rdev_t *rdev;
2398 struct list_head *tmp;
2399
2400 nr=working=active=failed=spare=0;
2401 ITERATE_RDEV(mddev,rdev,tmp) {
2402 nr++;
b2d444d7 2403 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2404 failed++;
2405 else {
2406 working++;
b2d444d7 2407 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 2408 active++;
2409 else
2410 spare++;
2411 }
2412 }
2413
2414 info.major_version = mddev->major_version;
2415 info.minor_version = mddev->minor_version;
2416 info.patch_version = MD_PATCHLEVEL_VERSION;
2417 info.ctime = mddev->ctime;
2418 info.level = mddev->level;
2419 info.size = mddev->size;
2420 info.nr_disks = nr;
2421 info.raid_disks = mddev->raid_disks;
2422 info.md_minor = mddev->md_minor;
2423 info.not_persistent= !mddev->persistent;
2424
2425 info.utime = mddev->utime;
2426 info.state = 0;
2427 if (mddev->in_sync)
2428 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 2429 if (mddev->bitmap && mddev->bitmap_offset)
2430 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 2431 info.active_disks = active;
2432 info.working_disks = working;
2433 info.failed_disks = failed;
2434 info.spare_disks = spare;
2435
2436 info.layout = mddev->layout;
2437 info.chunk_size = mddev->chunk_size;
2438
2439 if (copy_to_user(arg, &info, sizeof(info)))
2440 return -EFAULT;
2441
2442 return 0;
2443}
2444
87162a28 2445static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 2446{
2447 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
2448 char *ptr, *buf = NULL;
2449 int err = -ENOMEM;
2450
2451 file = kmalloc(sizeof(*file), GFP_KERNEL);
2452 if (!file)
2453 goto out;
2454
2455 /* bitmap disabled, zero the first byte and copy out */
2456 if (!mddev->bitmap || !mddev->bitmap->file) {
2457 file->pathname[0] = '\0';
2458 goto copy_out;
2459 }
2460
2461 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
2462 if (!buf)
2463 goto out;
2464
2465 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
2466 if (!ptr)
2467 goto out;
2468
2469 strcpy(file->pathname, ptr);
2470
2471copy_out:
2472 err = 0;
2473 if (copy_to_user(arg, file, sizeof(*file)))
2474 err = -EFAULT;
2475out:
2476 kfree(buf);
2477 kfree(file);
2478 return err;
2479}
2480
1da177e4
LT		 2481static int get_disk_info(mddev_t * mddev, void __user * arg)
2482{
2483 mdu_disk_info_t info;
2484 unsigned int nr;
2485 mdk_rdev_t *rdev;
2486
2487 if (copy_from_user(&info, arg, sizeof(info)))
2488 return -EFAULT;
2489
2490 nr = info.number;
2491
2492 rdev = find_rdev_nr(mddev, nr);
2493 if (rdev) {
2494 info.major = MAJOR(rdev->bdev->bd_dev);
2495 info.minor = MINOR(rdev->bdev->bd_dev);
2496 info.raid_disk = rdev->raid_disk;
2497 info.state = 0;
b2d444d7 2498 if (test_bit(Faulty, &rdev->flags))
1da177e4 2499 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 2500 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 2501 info.state |= (1<<MD_DISK_ACTIVE);
2502 info.state |= (1<<MD_DISK_SYNC);
2503 }
8ddf9efe
N		 2504 if (test_bit(WriteMostly, &rdev->flags))
2505 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 2506 } else {
2507 info.major = info.minor = 0;
2508 info.raid_disk = -1;
2509 info.state = (1<<MD_DISK_REMOVED);
2510 }
2511
2512 if (copy_to_user(arg, &info, sizeof(info)))
2513 return -EFAULT;
2514
2515 return 0;
2516}
2517
2518static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
2519{
2520 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
2521 mdk_rdev_t *rdev;
2522 dev_t dev = MKDEV(info->major,info->minor);
2523
2524 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
2525 return -EOVERFLOW;
2526
2527 if (!mddev->raid_disks) {
2528 int err;
2529 /* expecting a device which has a superblock */
2530 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
2531 if (IS_ERR(rdev)) {
2532 printk(KERN_WARNING
2533 "md: md_import_device returned %ld\n",
2534 PTR_ERR(rdev));
2535 return PTR_ERR(rdev);
2536 }
2537 if (!list_empty(&mddev->disks)) {
2538 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2539 mdk_rdev_t, same_set);
2540 int err = super_types[mddev->major_version]
2541 .load_super(rdev, rdev0, mddev->minor_version);
2542 if (err < 0) {
2543 printk(KERN_WARNING
2544 "md: %s has different UUID to %s\n",
2545 bdevname(rdev->bdev,b),
2546 bdevname(rdev0->bdev,b2));
2547 export_rdev(rdev);
2548 return -EINVAL;
2549 }
2550 }
2551 err = bind_rdev_to_array(rdev, mddev);
2552 if (err)
2553 export_rdev(rdev);
2554 return err;
2555 }
2556
2557 /*
2558 * add_new_disk can be used once the array is assembled
2559 * to add "hot spares". They must already have a superblock
2560 * written
2561 */
2562 if (mddev->pers) {
2563 int err;
2564 if (!mddev->pers->hot_add_disk) {
2565 printk(KERN_WARNING
2566 "%s: personality does not support diskops!\n",
2567 mdname(mddev));
2568 return -EINVAL;
2569 }
7b1e35f6
N		 2570 if (mddev->persistent)
2571 rdev = md_import_device(dev, mddev->major_version,
2572 mddev->minor_version);
2573 else
2574 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 2575 if (IS_ERR(rdev)) {
2576 printk(KERN_WARNING
2577 "md: md_import_device returned %ld\n",
2578 PTR_ERR(rdev));
2579 return PTR_ERR(rdev);
2580 }
41158c7e
N		 2581 /* set save_raid_disk if appropriate */
2582 if (!mddev->persistent) {
2583 if (info->state & (1<<MD_DISK_SYNC) &&
2584 info->raid_disk < mddev->raid_disks)
2585 rdev->raid_disk = info->raid_disk;
2586 else
2587 rdev->raid_disk = -1;
2588 } else
2589 super_types[mddev->major_version].
2590 validate_super(mddev, rdev);
2591 rdev->saved_raid_disk = rdev->raid_disk;
2592
b2d444d7 2593 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 2594 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
2595 set_bit(WriteMostly, &rdev->flags);
2596
1da177e4
LT		 2597 rdev->raid_disk = -1;
2598 err = bind_rdev_to_array(rdev, mddev);
2599 if (err)
2600 export_rdev(rdev);
c361777f
N		 2601
2602 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 2603 md_wakeup_thread(mddev->thread);
1da177e4
LT		 2604 return err;
2605 }
2606
2607 /* otherwise, add_new_disk is only allowed
2608 * for major_version==0 superblocks
2609 */
2610 if (mddev->major_version != 0) {
2611 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
2612 mdname(mddev));
2613 return -EINVAL;
2614 }
2615
2616 if (!(info->state & (1<<MD_DISK_FAULTY))) {
2617 int err;
2618 rdev = md_import_device (dev, -1, 0);
2619 if (IS_ERR(rdev)) {
2620 printk(KERN_WARNING
2621 "md: error, md_import_device() returned %ld\n",
2622 PTR_ERR(rdev));
2623 return PTR_ERR(rdev);
2624 }
2625 rdev->desc_nr = info->number;
2626 if (info->raid_disk < mddev->raid_disks)
2627 rdev->raid_disk = info->raid_disk;
2628 else
2629 rdev->raid_disk = -1;
2630
b2d444d7
N		 2631 rdev->flags = 0;
2632
1da177e4 2633 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 2634 if (info->state & (1<<MD_DISK_SYNC))
2635 set_bit(In_sync, &rdev->flags);
1da177e4 2636
8ddf9efe
N		 2637 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
2638 set_bit(WriteMostly, &rdev->flags);
2639
1da177e4
LT		 2640 err = bind_rdev_to_array(rdev, mddev);
2641 if (err) {
2642 export_rdev(rdev);
2643 return err;
2644 }
2645
2646 if (!mddev->persistent) {
2647 printk(KERN_INFO "md: nonpersistent superblock ...\n");
2648 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2649 } else
2650 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
2651 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
2652
2653 if (!mddev->size || (mddev->size > rdev->size))
2654 mddev->size = rdev->size;
2655 }
2656
2657 return 0;
2658}
2659
2660static int hot_remove_disk(mddev_t * mddev, dev_t dev)
2661{
2662 char b[BDEVNAME_SIZE];
2663 mdk_rdev_t *rdev;
2664
2665 if (!mddev->pers)
2666 return -ENODEV;
2667
2668 rdev = find_rdev(mddev, dev);
2669 if (!rdev)
2670 return -ENXIO;
2671
2672 if (rdev->raid_disk >= 0)
2673 goto busy;
2674
2675 kick_rdev_from_array(rdev);
2676 md_update_sb(mddev);
2677
2678 return 0;
2679busy:
2680 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
2681 bdevname(rdev->bdev,b), mdname(mddev));
2682 return -EBUSY;
2683}
2684
2685static int hot_add_disk(mddev_t * mddev, dev_t dev)
2686{
2687 char b[BDEVNAME_SIZE];
2688 int err;
2689 unsigned int size;
2690 mdk_rdev_t *rdev;
2691
2692 if (!mddev->pers)
2693 return -ENODEV;
2694
2695 if (mddev->major_version != 0) {
2696 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
2697 " version-0 superblocks.\n",
2698 mdname(mddev));
2699 return -EINVAL;
2700 }
2701 if (!mddev->pers->hot_add_disk) {
2702 printk(KERN_WARNING
2703 "%s: personality does not support diskops!\n",
2704 mdname(mddev));
2705 return -EINVAL;
2706 }
2707
2708 rdev = md_import_device (dev, -1, 0);
2709 if (IS_ERR(rdev)) {
2710 printk(KERN_WARNING
2711 "md: error, md_import_device() returned %ld\n",
2712 PTR_ERR(rdev));
2713 return -EINVAL;
2714 }
2715
2716 if (mddev->persistent)
2717 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
2718 else
2719 rdev->sb_offset =
2720 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2721
2722 size = calc_dev_size(rdev, mddev->chunk_size);
2723 rdev->size = size;
2724
2725 if (size < mddev->size) {
2726 printk(KERN_WARNING
2727 "%s: disk size %llu blocks < array size %llu\n",
2728 mdname(mddev), (unsigned long long)size,
2729 (unsigned long long)mddev->size);
2730 err = -ENOSPC;
2731 goto abort_export;
2732 }
2733
b2d444d7 2734 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 2735 printk(KERN_WARNING
2736 "md: can not hot-add faulty %s disk to %s!\n",
2737 bdevname(rdev->bdev,b), mdname(mddev));
2738 err = -EINVAL;
2739 goto abort_export;
2740 }
b2d444d7 2741 clear_bit(In_sync, &rdev->flags);
1da177e4
LT		 2742 rdev->desc_nr = -1;
2743 bind_rdev_to_array(rdev, mddev);
2744
2745 /*
2746 * The rest should better be atomic, we can have disk failures
2747 * noticed in interrupt contexts ...
2748 */
2749
2750 if (rdev->desc_nr == mddev->max_disks) {
2751 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
2752 mdname(mddev));
2753 err = -EBUSY;
2754 goto abort_unbind_export;
2755 }
2756
2757 rdev->raid_disk = -1;
2758
2759 md_update_sb(mddev);
2760
2761 /*
2762 * Kick recovery, maybe this spare has to be added to the
2763 * array immediately.
2764 */
2765 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2766 md_wakeup_thread(mddev->thread);
2767
2768 return 0;
2769
2770abort_unbind_export:
2771 unbind_rdev_from_array(rdev);
2772
2773abort_export:
2774 export_rdev(rdev);
2775 return err;
2776}
2777
32a7627c
N		 2778/* similar to deny_write_access, but accounts for our holding a reference
2779 * to the file ourselves */
2780static int deny_bitmap_write_access(struct file * file)
2781{
2782 struct inode *inode = file->f_mapping->host;
2783
2784 spin_lock(&inode->i_lock);
2785 if (atomic_read(&inode->i_writecount) > 1) {
2786 spin_unlock(&inode->i_lock);
2787 return -ETXTBSY;
2788 }
2789 atomic_set(&inode->i_writecount, -1);
2790 spin_unlock(&inode->i_lock);
2791
2792 return 0;
2793}
2794
2795static int set_bitmap_file(mddev_t *mddev, int fd)
2796{
2797 int err;
2798
36fa3063
N		 2799 if (mddev->pers) {
2800 if (!mddev->pers->quiesce)
2801 return -EBUSY;
2802 if (mddev->recovery || mddev->sync_thread)
2803 return -EBUSY;
2804 /* we should be able to change the bitmap.. */
2805 }
32a7627c 2806
32a7627c 2807
36fa3063
N		 2808 if (fd >= 0) {
2809 if (mddev->bitmap)
2810 return -EEXIST; /* cannot add when bitmap is present */
2811 mddev->bitmap_file = fget(fd);
32a7627c 2812
36fa3063
N		 2813 if (mddev->bitmap_file == NULL) {
2814 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
2815 mdname(mddev));
2816 return -EBADF;
2817 }
2818
2819 err = deny_bitmap_write_access(mddev->bitmap_file);
2820 if (err) {
2821 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
2822 mdname(mddev));
2823 fput(mddev->bitmap_file);
2824 mddev->bitmap_file = NULL;
2825 return err;
2826 }
a654b9d8 2827 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 2828 } else if (mddev->bitmap == NULL)
2829 return -ENOENT; /* cannot remove what isn't there */
2830 err = 0;
2831 if (mddev->pers) {
2832 mddev->pers->quiesce(mddev, 1);
2833 if (fd >= 0)
2834 err = bitmap_create(mddev);
2835 if (fd < 0 || err)
2836 bitmap_destroy(mddev);
2837 mddev->pers->quiesce(mddev, 0);
2838 } else if (fd < 0) {
2839 if (mddev->bitmap_file)
2840 fput(mddev->bitmap_file);
2841 mddev->bitmap_file = NULL;
2842 }
2843
32a7627c
N		 2844 return err;
2845}
2846
1da177e4
LT		 2847/*
2848 * set_array_info is used two different ways
2849 * The original usage is when creating a new array.
2850 * In this usage, raid_disks is > 0 and it together with
2851 * level, size, not_persistent,layout,chunksize determine the
2852 * shape of the array.
2853 * This will always create an array with a type-0.90.0 superblock.
2854 * The newer usage is when assembling an array.
2855 * In this case raid_disks will be 0, and the major_version field is
2856 * use to determine which style super-blocks are to be found on the devices.
2857 * The minor and patch _version numbers are also kept incase the
2858 * super_block handler wishes to interpret them.
2859 */
2860static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
2861{
2862
2863 if (info->raid_disks == 0) {
2864 /* just setting version number for superblock loading */
2865 if (info->major_version < 0 ||
2866 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
2867 super_types[info->major_version].name == NULL) {
2868 /* maybe try to auto-load a module? */
2869 printk(KERN_INFO
2870 "md: superblock version %d not known\n",
2871 info->major_version);
2872 return -EINVAL;
2873 }
2874 mddev->major_version = info->major_version;
2875 mddev->minor_version = info->minor_version;
2876 mddev->patch_version = info->patch_version;
2877 return 0;
2878 }
2879 mddev->major_version = MD_MAJOR_VERSION;
2880 mddev->minor_version = MD_MINOR_VERSION;
2881 mddev->patch_version = MD_PATCHLEVEL_VERSION;
2882 mddev->ctime = get_seconds();
2883
2884 mddev->level = info->level;
2885 mddev->size = info->size;
2886 mddev->raid_disks = info->raid_disks;
2887 /* don't set md_minor, it is determined by which /dev/md* was
2888 * openned
2889 */
2890 if (info->state & (1<<MD_SB_CLEAN))
2891 mddev->recovery_cp = MaxSector;
2892 else
2893 mddev->recovery_cp = 0;
2894 mddev->persistent = ! info->not_persistent;
2895
2896 mddev->layout = info->layout;
2897 mddev->chunk_size = info->chunk_size;
2898
2899 mddev->max_disks = MD_SB_DISKS;
2900
2901 mddev->sb_dirty = 1;
2902
2903 /*
2904 * Generate a 128 bit UUID
2905 */
2906 get_random_bytes(mddev->uuid, 16);
2907
2908 return 0;
2909}
2910
2911/*
2912 * update_array_info is used to change the configuration of an
2913 * on-line array.
2914 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
2915 * fields in the info are checked against the array.
2916 * Any differences that cannot be handled will cause an error.
2917 * Normally, only one change can be managed at a time.
2918 */
2919static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
2920{
2921 int rv = 0;
2922 int cnt = 0;
36fa3063
N		 2923 int state = 0;
2924
2925 /* calculate expected state,ignoring low bits */
2926 if (mddev->bitmap && mddev->bitmap_offset)
2927 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 2928
2929 if (mddev->major_version != info->major_version ||
2930 mddev->minor_version != info->minor_version ||
2931/* mddev->patch_version != info->patch_version || */
2932 mddev->ctime != info->ctime ||
2933 mddev->level != info->level ||
2934/* mddev->layout != info->layout || */
2935 !mddev->persistent != info->not_persistent||
36fa3063
N		 2936 mddev->chunk_size != info->chunk_size ||
2937 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
2938 ((state^info->state) & 0xfffffe00)
2939 )
1da177e4
LT		 2940 return -EINVAL;
2941 /* Check there is only one change */
2942 if (mddev->size != info->size) cnt++;
2943 if (mddev->raid_disks != info->raid_disks) cnt++;
2944 if (mddev->layout != info->layout) cnt++;
36fa3063 2945 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 2946 if (cnt == 0) return 0;
2947 if (cnt > 1) return -EINVAL;
2948
2949 if (mddev->layout != info->layout) {
2950 /* Change layout
2951 * we don't need to do anything at the md level, the
2952 * personality will take care of it all.
2953 */
2954 if (mddev->pers->reconfig == NULL)
2955 return -EINVAL;
2956 else
2957 return mddev->pers->reconfig(mddev, info->layout, -1);
2958 }
2959 if (mddev->size != info->size) {
2960 mdk_rdev_t * rdev;
2961 struct list_head *tmp;
2962 if (mddev->pers->resize == NULL)
2963 return -EINVAL;
2964 /* The "size" is the amount of each device that is used.
2965 * This can only make sense for arrays with redundancy.
2966 * linear and raid0 always use whatever space is available
2967 * We can only consider changing the size if no resync
2968 * or reconstruction is happening, and if the new size
2969 * is acceptable. It must fit before the sb_offset or,
2970 * if that is <data_offset, it must fit before the
2971 * size of each device.
2972 * If size is zero, we find the largest size that fits.
2973 */
2974 if (mddev->sync_thread)
2975 return -EBUSY;
2976 ITERATE_RDEV(mddev,rdev,tmp) {
2977 sector_t avail;
2978 int fit = (info->size == 0);
2979 if (rdev->sb_offset > rdev->data_offset)
2980 avail = (rdev->sb_offset*2) - rdev->data_offset;
2981 else
2982 avail = get_capacity(rdev->bdev->bd_disk)
2983 - rdev->data_offset;
2984 if (fit && (info->size == 0 || info->size > avail/2))
2985 info->size = avail/2;
2986 if (avail < ((sector_t)info->size << 1))
2987 return -ENOSPC;
2988 }
2989 rv = mddev->pers->resize(mddev, (sector_t)info->size *2);
2990 if (!rv) {
2991 struct block_device *bdev;
2992
2993 bdev = bdget_disk(mddev->gendisk, 0);
2994 if (bdev) {
2995 down(&bdev->bd_inode->i_sem);
2996 i_size_write(bdev->bd_inode, mddev->array_size << 10);
2997 up(&bdev->bd_inode->i_sem);
2998 bdput(bdev);
2999 }
3000 }
3001 }
3002 if (mddev->raid_disks != info->raid_disks) {
3003 /* change the number of raid disks */
3004 if (mddev->pers->reshape == NULL)
3005 return -EINVAL;
3006 if (info->raid_disks <= 0 ||
3007 info->raid_disks >= mddev->max_disks)
3008 return -EINVAL;
3009 if (mddev->sync_thread)
3010 return -EBUSY;
3011 rv = mddev->pers->reshape(mddev, info->raid_disks);
3012 if (!rv) {
3013 struct block_device *bdev;
3014
3015 bdev = bdget_disk(mddev->gendisk, 0);
3016 if (bdev) {
3017 down(&bdev->bd_inode->i_sem);
3018 i_size_write(bdev->bd_inode, mddev->array_size << 10);
3019 up(&bdev->bd_inode->i_sem);
3020 bdput(bdev);
3021 }
3022 }
3023 }
36fa3063
N		 3024 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
3025 if (mddev->pers->quiesce == NULL)
3026 return -EINVAL;
3027 if (mddev->recovery || mddev->sync_thread)
3028 return -EBUSY;
3029 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
3030 /* add the bitmap */
3031 if (mddev->bitmap)
3032 return -EEXIST;
3033 if (mddev->default_bitmap_offset == 0)
3034 return -EINVAL;
3035 mddev->bitmap_offset = mddev->default_bitmap_offset;
3036 mddev->pers->quiesce(mddev, 1);
3037 rv = bitmap_create(mddev);
3038 if (rv)
3039 bitmap_destroy(mddev);
3040 mddev->pers->quiesce(mddev, 0);
3041 } else {
3042 /* remove the bitmap */
3043 if (!mddev->bitmap)
3044 return -ENOENT;
3045 if (mddev->bitmap->file)
3046 return -EINVAL;
3047 mddev->pers->quiesce(mddev, 1);
3048 bitmap_destroy(mddev);
3049 mddev->pers->quiesce(mddev, 0);
3050 mddev->bitmap_offset = 0;
3051 }
3052 }
1da177e4
LT		 3053 md_update_sb(mddev);
3054 return rv;
3055}
3056
3057static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3058{
3059 mdk_rdev_t *rdev;
3060
3061 if (mddev->pers == NULL)
3062 return -ENODEV;
3063
3064 rdev = find_rdev(mddev, dev);
3065 if (!rdev)
3066 return -ENODEV;
3067
3068 md_error(mddev, rdev);
3069 return 0;
3070}
3071
3072static int md_ioctl(struct inode *inode, struct file *file,
3073 unsigned int cmd, unsigned long arg)
3074{
3075 int err = 0;
3076 void __user *argp = (void __user *)arg;
3077 struct hd_geometry __user *loc = argp;
3078 mddev_t *mddev = NULL;
3079
3080 if (!capable(CAP_SYS_ADMIN))
3081 return -EACCES;
3082
3083 /*
3084 * Commands dealing with the RAID driver but not any
3085 * particular array:
3086 */
3087 switch (cmd)
3088 {
3089 case RAID_VERSION:
3090 err = get_version(argp);
3091 goto done;
3092
3093 case PRINT_RAID_DEBUG:
3094 err = 0;
3095 md_print_devices();
3096 goto done;
3097
3098#ifndef MODULE
3099 case RAID_AUTORUN:
3100 err = 0;
3101 autostart_arrays(arg);
3102 goto done;
3103#endif
3104 default:;
3105 }
3106
3107 /*
3108 * Commands creating/starting a new array:
3109 */
3110
3111 mddev = inode->i_bdev->bd_disk->private_data;
3112
3113 if (!mddev) {
3114 BUG();
3115 goto abort;
3116 }
3117
3118
3119 if (cmd == START_ARRAY) {
3120 /* START_ARRAY doesn't need to lock the array as autostart_array
3121 * does the locking, and it could even be a different array
3122 */
3123 static int cnt = 3;
3124 if (cnt > 0 ) {
3125 printk(KERN_WARNING
3126 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
3127 "This will not be supported beyond 2.6\n",
3128 current->comm, current->pid);
3129 cnt--;
3130 }
3131 err = autostart_array(new_decode_dev(arg));
3132 if (err) {
3133 printk(KERN_WARNING "md: autostart failed!\n");
3134 goto abort;
3135 }
3136 goto done;
3137 }
3138
3139 err = mddev_lock(mddev);
3140 if (err) {
3141 printk(KERN_INFO
3142 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3143 err, cmd);
3144 goto abort;
3145 }
3146
3147 switch (cmd)
3148 {
3149 case SET_ARRAY_INFO:
3150 {
3151 mdu_array_info_t info;
3152 if (!arg)
3153 memset(&info, 0, sizeof(info));
3154 else if (copy_from_user(&info, argp, sizeof(info))) {
3155 err = -EFAULT;
3156 goto abort_unlock;
3157 }
3158 if (mddev->pers) {
3159 err = update_array_info(mddev, &info);
3160 if (err) {
3161 printk(KERN_WARNING "md: couldn't update"
3162 " array info. %d\n", err);
3163 goto abort_unlock;
3164 }
3165 goto done_unlock;
3166 }
3167 if (!list_empty(&mddev->disks)) {
3168 printk(KERN_WARNING
3169 "md: array %s already has disks!\n",
3170 mdname(mddev));
3171 err = -EBUSY;
3172 goto abort_unlock;
3173 }
3174 if (mddev->raid_disks) {
3175 printk(KERN_WARNING
3176 "md: array %s already initialised!\n",
3177 mdname(mddev));
3178 err = -EBUSY;
3179 goto abort_unlock;
3180 }
3181 err = set_array_info(mddev, &info);
3182 if (err) {
3183 printk(KERN_WARNING "md: couldn't set"
3184 " array info. %d\n", err);
3185 goto abort_unlock;
3186 }
3187 }
3188 goto done_unlock;
3189
3190 default:;
3191 }
3192
3193 /*
3194 * Commands querying/configuring an existing array:
3195 */
32a7627c
N		 3196 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3197 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3198 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3199 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
1da177e4
LT		 3200 err = -ENODEV;
3201 goto abort_unlock;
3202 }
3203
3204 /*
3205 * Commands even a read-only array can execute:
3206 */
3207 switch (cmd)
3208 {
3209 case GET_ARRAY_INFO:
3210 err = get_array_info(mddev, argp);
3211 goto done_unlock;
3212
32a7627c 3213 case GET_BITMAP_FILE:
87162a28 3214 err = get_bitmap_file(mddev, argp);
32a7627c
N		 3215 goto done_unlock;
3216
1da177e4
LT		 3217 case GET_DISK_INFO:
3218 err = get_disk_info(mddev, argp);
3219 goto done_unlock;
3220
3221 case RESTART_ARRAY_RW:
3222 err = restart_array(mddev);
3223 goto done_unlock;
3224
3225 case STOP_ARRAY:
3226 err = do_md_stop (mddev, 0);
3227 goto done_unlock;
3228
3229 case STOP_ARRAY_RO:
3230 err = do_md_stop (mddev, 1);
3231 goto done_unlock;
3232
3233 /*
3234 * We have a problem here : there is no easy way to give a CHS
3235 * virtual geometry. We currently pretend that we have a 2 heads
3236 * 4 sectors (with a BIG number of cylinders...). This drives
3237 * dosfs just mad... ;-)
3238 */
3239 case HDIO_GETGEO:
3240 if (!loc) {
3241 err = -EINVAL;
3242 goto abort_unlock;
3243 }
3244 err = put_user (2, (char __user *) &loc->heads);
3245 if (err)
3246 goto abort_unlock;
3247 err = put_user (4, (char __user *) &loc->sectors);
3248 if (err)
3249 goto abort_unlock;
3250 err = put_user(get_capacity(mddev->gendisk)/8,
3251 (short __user *) &loc->cylinders);
3252 if (err)
3253 goto abort_unlock;
3254 err = put_user (get_start_sect(inode->i_bdev),
3255 (long __user *) &loc->start);
3256 goto done_unlock;
3257 }
3258
3259 /*
3260 * The remaining ioctls are changing the state of the
3261 * superblock, so we do not allow read-only arrays
3262 * here:
3263 */
3264 if (mddev->ro) {
3265 err = -EROFS;
3266 goto abort_unlock;
3267 }
3268
3269 switch (cmd)
3270 {
3271 case ADD_NEW_DISK:
3272 {
3273 mdu_disk_info_t info;
3274 if (copy_from_user(&info, argp, sizeof(info)))
3275 err = -EFAULT;
3276 else
3277 err = add_new_disk(mddev, &info);
3278 goto done_unlock;
3279 }
3280
3281 case HOT_REMOVE_DISK:
3282 err = hot_remove_disk(mddev, new_decode_dev(arg));
3283 goto done_unlock;
3284
3285 case HOT_ADD_DISK:
3286 err = hot_add_disk(mddev, new_decode_dev(arg));
3287 goto done_unlock;
3288
3289 case SET_DISK_FAULTY:
3290 err = set_disk_faulty(mddev, new_decode_dev(arg));
3291 goto done_unlock;
3292
3293 case RUN_ARRAY:
3294 err = do_md_run (mddev);
3295 goto done_unlock;
3296
32a7627c
N		 3297 case SET_BITMAP_FILE:
3298 err = set_bitmap_file(mddev, (int)arg);
3299 goto done_unlock;
3300
1da177e4
LT		 3301 default:
3302 if (_IOC_TYPE(cmd) == MD_MAJOR)
3303 printk(KERN_WARNING "md: %s(pid %d) used"
3304 " obsolete MD ioctl, upgrade your"
3305 " software to use new ictls.\n",
3306 current->comm, current->pid);
3307 err = -EINVAL;
3308 goto abort_unlock;
3309 }
3310
3311done_unlock:
3312abort_unlock:
3313 mddev_unlock(mddev);
3314
3315 return err;
3316done:
3317 if (err)
3318 MD_BUG();
3319abort:
3320 return err;
3321}
3322
3323static int md_open(struct inode *inode, struct file *file)
3324{
3325 /*
3326 * Succeed if we can lock the mddev, which confirms that
3327 * it isn't being stopped right now.
3328 */
3329 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3330 int err;
3331
3332 if ((err = mddev_lock(mddev)))
3333 goto out;
3334
3335 err = 0;
3336 mddev_get(mddev);
3337 mddev_unlock(mddev);
3338
3339 check_disk_change(inode->i_bdev);
3340 out:
3341 return err;
3342}
3343
3344static int md_release(struct inode *inode, struct file * file)
3345{
3346 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3347
3348 if (!mddev)
3349 BUG();
3350 mddev_put(mddev);
3351
3352 return 0;
3353}
3354
3355static int md_media_changed(struct gendisk *disk)
3356{
3357 mddev_t *mddev = disk->private_data;
3358
3359 return mddev->changed;
3360}
3361
3362static int md_revalidate(struct gendisk *disk)
3363{
3364 mddev_t *mddev = disk->private_data;
3365
3366 mddev->changed = 0;
3367 return 0;
3368}
3369static struct block_device_operations md_fops =
3370{
3371 .owner = THIS_MODULE,
3372 .open = md_open,
3373 .release = md_release,
3374 .ioctl = md_ioctl,
3375 .media_changed = md_media_changed,
3376 .revalidate_disk= md_revalidate,
3377};
3378
75c96f85 3379static int md_thread(void * arg)
1da177e4
LT		 3380{
3381 mdk_thread_t *thread = arg;
3382
1da177e4
LT		 3383 /*
3384 * md_thread is a 'system-thread', it's priority should be very
3385 * high. We avoid resource deadlocks individually in each
3386 * raid personality. (RAID5 does preallocation) We also use RR and
3387 * the very same RT priority as kswapd, thus we will never get
3388 * into a priority inversion deadlock.
3389 *
3390 * we definitely have to have equal or higher priority than
3391 * bdflush, otherwise bdflush will deadlock if there are too
3392 * many dirty RAID5 blocks.
3393 */
1da177e4 3394
6985c43f 3395 allow_signal(SIGKILL);
1da177e4 3396 complete(thread->event);
a6fb0934 3397 while (!kthread_should_stop()) {
1da177e4
LT		 3398 void (*run)(mddev_t *);
3399
32a7627c 3400 wait_event_interruptible_timeout(thread->wqueue,
a6fb0934
N		 3401 test_bit(THREAD_WAKEUP, &thread->flags)
3402 || kthread_should_stop(),
32a7627c 3403 thread->timeout);
3e1d1d28 3404 try_to_freeze();
1da177e4
LT		 3405
3406 clear_bit(THREAD_WAKEUP, &thread->flags);
3407
3408 run = thread->run;
3409 if (run)
3410 run(thread->mddev);
1da177e4 3411 }
a6fb0934 3412
1da177e4
LT		 3413 return 0;
3414}
3415
3416void md_wakeup_thread(mdk_thread_t *thread)
3417{
3418 if (thread) {
3419 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
3420 set_bit(THREAD_WAKEUP, &thread->flags);
3421 wake_up(&thread->wqueue);
3422 }
3423}
3424
3425mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
3426 const char *name)
3427{
3428 mdk_thread_t *thread;
1da177e4
LT		 3429 struct completion event;
3430
a6fb0934 3431 thread = kmalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 3432 if (!thread)
3433 return NULL;
3434
3435 memset(thread, 0, sizeof(mdk_thread_t));
3436 init_waitqueue_head(&thread->wqueue);
3437
3438 init_completion(&event);
3439 thread->event = &event;
3440 thread->run = run;
3441 thread->mddev = mddev;
3442 thread->name = name;
32a7627c 3443 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 3444 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 3445 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 3446 kfree(thread);
3447 return NULL;
3448 }
3449 wait_for_completion(&event);
3450 return thread;
3451}
3452
1da177e4
LT		 3453void md_unregister_thread(mdk_thread_t *thread)
3454{
d28446fe 3455 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
a6fb0934
N		 3456
3457 kthread_stop(thread->tsk);
1da177e4
LT		 3458 kfree(thread);
3459}
3460
3461void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
3462{
3463 if (!mddev) {
3464 MD_BUG();
3465 return;
3466 }
3467
b2d444d7 3468 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 3469 return;
32a7627c 3470/*
1da177e4
LT		 3471 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
3472 mdname(mddev),
3473 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
3474 __builtin_return_address(0),__builtin_return_address(1),
3475 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 3476*/
1da177e4
LT		 3477 if (!mddev->pers->error_handler)
3478 return;
3479 mddev->pers->error_handler(mddev,rdev);
3480 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3481 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3482 md_wakeup_thread(mddev->thread);
3483}
3484
3485/* seq_file implementation /proc/mdstat */
3486
3487static void status_unused(struct seq_file *seq)
3488{
3489 int i = 0;
3490 mdk_rdev_t *rdev;
3491 struct list_head *tmp;
3492
3493 seq_printf(seq, "unused devices: ");
3494
3495 ITERATE_RDEV_PENDING(rdev,tmp) {
3496 char b[BDEVNAME_SIZE];
3497 i++;
3498 seq_printf(seq, "%s ",
3499 bdevname(rdev->bdev,b));
3500 }
3501 if (!i)
3502 seq_printf(seq, "<none>");
3503
3504 seq_printf(seq, "\n");
3505}
3506
3507
3508static void status_resync(struct seq_file *seq, mddev_t * mddev)
3509{
3510 unsigned long max_blocks, resync, res, dt, db, rt;
3511
3512 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
3513
3514 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3515 max_blocks = mddev->resync_max_sectors >> 1;
3516 else
3517 max_blocks = mddev->size;
3518
3519 /*
3520 * Should not happen.
3521 */
3522 if (!max_blocks) {
3523 MD_BUG();
3524 return;
3525 }
3526 res = (resync/1024)*1000/(max_blocks/1024 + 1);
3527 {
3528 int i, x = res/50, y = 20-x;
3529 seq_printf(seq, "[");
3530 for (i = 0; i < x; i++)
3531 seq_printf(seq, "=");
3532 seq_printf(seq, ">");
3533 for (i = 0; i < y; i++)
3534 seq_printf(seq, ".");
3535 seq_printf(seq, "] ");
3536 }
3537 seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)",
3538 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
3539 "resync" : "recovery"),
3540 res/10, res % 10, resync, max_blocks);
3541
3542 /*
3543 * We do not want to overflow, so the order of operands and
3544 * the * 100 / 100 trick are important. We do a +1 to be
3545 * safe against division by zero. We only estimate anyway.
3546 *
3547 * dt: time from mark until now
3548 * db: blocks written from mark until now
3549 * rt: remaining time
3550 */
3551 dt = ((jiffies - mddev->resync_mark) / HZ);
3552 if (!dt) dt++;
3553 db = resync - (mddev->resync_mark_cnt/2);
3554 rt = (dt * ((max_blocks-resync) / (db/100+1)))/100;
3555
3556 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
3557
3558 seq_printf(seq, " speed=%ldK/sec", db/dt);
3559}
3560
3561static void *md_seq_start(struct seq_file *seq, loff_t *pos)
3562{
3563 struct list_head *tmp;
3564 loff_t l = *pos;
3565 mddev_t *mddev;
3566
3567 if (l >= 0x10000)
3568 return NULL;
3569 if (!l--)
3570 /* header */
3571 return (void*)1;
3572
3573 spin_lock(&all_mddevs_lock);
3574 list_for_each(tmp,&all_mddevs)
3575 if (!l--) {
3576 mddev = list_entry(tmp, mddev_t, all_mddevs);
3577 mddev_get(mddev);
3578 spin_unlock(&all_mddevs_lock);
3579 return mddev;
3580 }
3581 spin_unlock(&all_mddevs_lock);
3582 if (!l--)
3583 return (void*)2;/* tail */
3584 return NULL;
3585}
3586
3587static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3588{
3589 struct list_head *tmp;
3590 mddev_t *next_mddev, *mddev = v;
3591
3592 ++*pos;
3593 if (v == (void*)2)
3594 return NULL;
3595
3596 spin_lock(&all_mddevs_lock);
3597 if (v == (void*)1)
3598 tmp = all_mddevs.next;
3599 else
3600 tmp = mddev->all_mddevs.next;
3601 if (tmp != &all_mddevs)
3602 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
3603 else {
3604 next_mddev = (void*)2;
3605 *pos = 0x10000;
3606 }
3607 spin_unlock(&all_mddevs_lock);
3608
3609 if (v != (void*)1)
3610 mddev_put(mddev);
3611 return next_mddev;
3612
3613}
3614
3615static void md_seq_stop(struct seq_file *seq, void *v)
3616{
3617 mddev_t *mddev = v;
3618
3619 if (mddev && v != (void*)1 && v != (void*)2)
3620 mddev_put(mddev);
3621}
3622
3623static int md_seq_show(struct seq_file *seq, void *v)
3624{
3625 mddev_t *mddev = v;
3626 sector_t size;
3627 struct list_head *tmp2;
3628 mdk_rdev_t *rdev;
3629 int i;
32a7627c 3630 struct bitmap *bitmap;
1da177e4
LT		 3631
3632 if (v == (void*)1) {
3633 seq_printf(seq, "Personalities : ");
3634 spin_lock(&pers_lock);
3635 for (i = 0; i < MAX_PERSONALITY; i++)
3636 if (pers[i])
3637 seq_printf(seq, "[%s] ", pers[i]->name);
3638
3639 spin_unlock(&pers_lock);
3640 seq_printf(seq, "\n");
3641 return 0;
3642 }
3643 if (v == (void*)2) {
3644 status_unused(seq);
3645 return 0;
3646 }
3647
3648 if (mddev_lock(mddev)!=0)
3649 return -EINTR;
3650 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
3651 seq_printf(seq, "%s : %sactive", mdname(mddev),
3652 mddev->pers ? "" : "in");
3653 if (mddev->pers) {
3654 if (mddev->ro)
3655 seq_printf(seq, " (read-only)");
3656 seq_printf(seq, " %s", mddev->pers->name);
3657 }
3658
3659 size = 0;
3660 ITERATE_RDEV(mddev,rdev,tmp2) {
3661 char b[BDEVNAME_SIZE];
3662 seq_printf(seq, " %s[%d]",
3663 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 3664 if (test_bit(WriteMostly, &rdev->flags))
3665 seq_printf(seq, "(W)");
b2d444d7 3666 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 3667 seq_printf(seq, "(F)");
3668 continue;
b325a32e
N		 3669 } else if (rdev->raid_disk < 0)
3670 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 3671 size += rdev->size;
3672 }
3673
3674 if (!list_empty(&mddev->disks)) {
3675 if (mddev->pers)
3676 seq_printf(seq, "\n %llu blocks",
3677 (unsigned long long)mddev->array_size);
3678 else
3679 seq_printf(seq, "\n %llu blocks",
3680 (unsigned long long)size);
3681 }
1cd6bf19
N		 3682 if (mddev->persistent) {
3683 if (mddev->major_version != 0 ||
3684 mddev->minor_version != 90) {
3685 seq_printf(seq," super %d.%d",
3686 mddev->major_version,
3687 mddev->minor_version);
3688 }
3689 } else
3690 seq_printf(seq, " super non-persistent");
1da177e4
LT		 3691
3692 if (mddev->pers) {
3693 mddev->pers->status (seq, mddev);
3694 seq_printf(seq, "\n ");
32a7627c 3695 if (mddev->curr_resync > 2) {
1da177e4 3696 status_resync (seq, mddev);
32a7627c
N		 3697 seq_printf(seq, "\n ");
3698 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
3699 seq_printf(seq, " resync=DELAYED\n ");
3700 } else
3701 seq_printf(seq, "\n ");
3702
3703 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 3704 unsigned long chunk_kb;
3705 unsigned long flags;
32a7627c
N		 3706 spin_lock_irqsave(&bitmap->lock, flags);
3707 chunk_kb = bitmap->chunksize >> 10;
3708 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
3709 "%lu%s chunk",
3710 bitmap->pages - bitmap->missing_pages,
3711 bitmap->pages,
3712 (bitmap->pages - bitmap->missing_pages)
3713 << (PAGE_SHIFT - 10),
3714 chunk_kb ? chunk_kb : bitmap->chunksize,
3715 chunk_kb ? "KB" : "B");
78d742d8
N		 3716 if (bitmap->file) {
3717 seq_printf(seq, ", file: ");
3718 seq_path(seq, bitmap->file->f_vfsmnt,
3719 bitmap->file->f_dentry," \t\n");
32a7627c 3720 }
78d742d8 3721
32a7627c
N		 3722 seq_printf(seq, "\n");
3723 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 3724 }
3725
3726 seq_printf(seq, "\n");
3727 }
3728 mddev_unlock(mddev);
3729
3730 return 0;
3731}
3732
3733static struct seq_operations md_seq_ops = {
3734 .start = md_seq_start,
3735 .next = md_seq_next,
3736 .stop = md_seq_stop,
3737 .show = md_seq_show,
3738};
3739
3740static int md_seq_open(struct inode *inode, struct file *file)
3741{
3742 int error;
3743
3744 error = seq_open(file, &md_seq_ops);
3745 return error;
3746}
3747
3748static struct file_operations md_seq_fops = {
3749 .open = md_seq_open,
3750 .read = seq_read,
3751 .llseek = seq_lseek,
3752 .release = seq_release,
3753};
3754
3755int register_md_personality(int pnum, mdk_personality_t *p)
3756{
3757 if (pnum >= MAX_PERSONALITY) {
3758 printk(KERN_ERR
3759 "md: tried to install personality %s as nr %d, but max is %lu\n",
3760 p->name, pnum, MAX_PERSONALITY-1);
3761 return -EINVAL;
3762 }
3763
3764 spin_lock(&pers_lock);
3765 if (pers[pnum]) {
3766 spin_unlock(&pers_lock);
1da177e4
LT		 3767 return -EBUSY;
3768 }
3769
3770 pers[pnum] = p;
3771 printk(KERN_INFO "md: %s personality registered as nr %d\n", p->name, pnum);
3772 spin_unlock(&pers_lock);
3773 return 0;
3774}
3775
3776int unregister_md_personality(int pnum)
3777{
a757e64c 3778 if (pnum >= MAX_PERSONALITY)
1da177e4 3779 return -EINVAL;
1da177e4
LT		 3780
3781 printk(KERN_INFO "md: %s personality unregistered\n", pers[pnum]->name);
3782 spin_lock(&pers_lock);
3783 pers[pnum] = NULL;
3784 spin_unlock(&pers_lock);
3785 return 0;
3786}
3787
3788static int is_mddev_idle(mddev_t *mddev)
3789{
3790 mdk_rdev_t * rdev;
3791 struct list_head *tmp;
3792 int idle;
3793 unsigned long curr_events;
3794
3795 idle = 1;
3796 ITERATE_RDEV(mddev,rdev,tmp) {
3797 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 3798 curr_events = disk_stat_read(disk, sectors[0]) +
3799 disk_stat_read(disk, sectors[1]) -
1da177e4
LT		 3800 atomic_read(&disk->sync_io);
3801 /* Allow some slack between valud of curr_events and last_events,
3802 * as there are some uninteresting races.
3803 * Note: the following is an unsigned comparison.
3804 */
3805 if ((curr_events - rdev->last_events + 32) > 64) {
3806 rdev->last_events = curr_events;
3807 idle = 0;
3808 }
3809 }
3810 return idle;
3811}
3812
3813void md_done_sync(mddev_t *mddev, int blocks, int ok)
3814{
3815 /* another "blocks" (512byte) blocks have been synced */
3816 atomic_sub(blocks, &mddev->recovery_active);
3817 wake_up(&mddev->recovery_wait);
3818 if (!ok) {
3819 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
3820 md_wakeup_thread(mddev->thread);
3821 // stop recovery, signal do_sync ....
3822 }
3823}
3824
3825
06d91a5f
N		 3826/* md_write_start(mddev, bi)
3827 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 3828 * in superblock) before writing, schedule a superblock update
3829 * and wait for it to complete.
06d91a5f 3830 */
3d310eb7 3831void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 3832{
06d91a5f 3833 if (bio_data_dir(bi) != WRITE)
3d310eb7 3834 return;
06d91a5f
N		 3835
3836 atomic_inc(&mddev->writes_pending);
06d91a5f 3837 if (mddev->in_sync) {
a9701a30 3838 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 3839 if (mddev->in_sync) {
3840 mddev->in_sync = 0;
3841 mddev->sb_dirty = 1;
3842 md_wakeup_thread(mddev->thread);
3843 }
a9701a30 3844 spin_unlock_irq(&mddev->write_lock);
06d91a5f 3845 }
3d310eb7 3846 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
1da177e4
LT		 3847}
3848
3849void md_write_end(mddev_t *mddev)
3850{
3851 if (atomic_dec_and_test(&mddev->writes_pending)) {
3852 if (mddev->safemode == 2)
3853 md_wakeup_thread(mddev->thread);
3854 else
3855 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
3856 }
3857}
3858
75c96f85 3859static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
1da177e4
LT		 3860
3861#define SYNC_MARKS 10
3862#define SYNC_MARK_STEP (3*HZ)
3863static void md_do_sync(mddev_t *mddev)
3864{
3865 mddev_t *mddev2;
3866 unsigned int currspeed = 0,
3867 window;
57afd89f 3868 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 3869 unsigned long mark[SYNC_MARKS];
3870 sector_t mark_cnt[SYNC_MARKS];
3871 int last_mark,m;
3872 struct list_head *tmp;
3873 sector_t last_check;
57afd89f 3874 int skipped = 0;
1da177e4
LT		 3875
3876 /* just incase thread restarts... */
3877 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
3878 return;
3879
3880 /* we overload curr_resync somewhat here.
3881 * 0 == not engaged in resync at all
3882 * 2 == checking that there is no conflict with another sync
3883 * 1 == like 2, but have yielded to allow conflicting resync to
3884 * commense
3885 * other == active in resync - this many blocks
3886 *
3887 * Before starting a resync we must have set curr_resync to
3888 * 2, and then checked that every "conflicting" array has curr_resync
3889 * less than ours. When we find one that is the same or higher
3890 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
3891 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
3892 * This will mean we have to start checking from the beginning again.
3893 *
3894 */
3895
3896 do {
3897 mddev->curr_resync = 2;
3898
3899 try_again:
8712e553
N		 3900 if (signal_pending(current) ||
3901 kthread_should_stop()) {
1da177e4 3902 flush_signals(current);
6985c43f 3903 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 3904 goto skip;
3905 }
3906 ITERATE_MDDEV(mddev2,tmp) {
1da177e4
LT		 3907 if (mddev2 == mddev)
3908 continue;
3909 if (mddev2->curr_resync &&
3910 match_mddev_units(mddev,mddev2)) {
3911 DEFINE_WAIT(wq);
3912 if (mddev < mddev2 && mddev->curr_resync == 2) {
3913 /* arbitrarily yield */
3914 mddev->curr_resync = 1;
3915 wake_up(&resync_wait);
3916 }
3917 if (mddev > mddev2 && mddev->curr_resync == 1)
3918 /* no need to wait here, we can wait the next
3919 * time 'round when curr_resync == 2
3920 */
3921 continue;
3922 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8712e553
N		 3923 if (!signal_pending(current) &&
3924 !kthread_should_stop() &&
3925 mddev2->curr_resync >= mddev->curr_resync) {
1da177e4
LT		 3926 printk(KERN_INFO "md: delaying resync of %s"
3927 " until %s has finished resync (they"
3928 " share one or more physical units)\n",
3929 mdname(mddev), mdname(mddev2));
3930 mddev_put(mddev2);
3931 schedule();
3932 finish_wait(&resync_wait, &wq);
3933 goto try_again;
3934 }
3935 finish_wait(&resync_wait, &wq);
3936 }
3937 }
3938 } while (mddev->curr_resync < 2);
3939
9d88883e 3940 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 3941 /* resync follows the size requested by the personality,
57afd89f 3942 * which defaults to physical size, but can be virtual size
1da177e4
LT		 3943 */
3944 max_sectors = mddev->resync_max_sectors;
9d88883e
N		 3945 mddev->resync_mismatches = 0;
3946 } else
1da177e4
LT		 3947 /* recovery follows the physical size of devices */
3948 max_sectors = mddev->size << 1;
3949
3950 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
3951 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
3952 " %d KB/sec/disc.\n", sysctl_speed_limit_min);
338cec32 3953 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
1da177e4
LT		 3954 "(but not more than %d KB/sec) for reconstruction.\n",
3955 sysctl_speed_limit_max);
3956
3957 is_mddev_idle(mddev); /* this also initializes IO event counters */
32a7627c 3958 /* we don't use the checkpoint if there's a bitmap */
24dd469d
N		 3959 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap
3960 && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
1da177e4
LT		 3961 j = mddev->recovery_cp;
3962 else
3963 j = 0;
57afd89f 3964 io_sectors = 0;
1da177e4
LT		 3965 for (m = 0; m < SYNC_MARKS; m++) {
3966 mark[m] = jiffies;
57afd89f 3967 mark_cnt[m] = io_sectors;
1da177e4
LT		 3968 }
3969 last_mark = 0;
3970 mddev->resync_mark = mark[last_mark];
3971 mddev->resync_mark_cnt = mark_cnt[last_mark];
3972
3973 /*
3974 * Tune reconstruction:
3975 */
3976 window = 32*(PAGE_SIZE/512);
3977 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
3978 window/2,(unsigned long long) max_sectors/2);
3979
3980 atomic_set(&mddev->recovery_active, 0);
3981 init_waitqueue_head(&mddev->recovery_wait);
3982 last_check = 0;
3983
3984 if (j>2) {
3985 printk(KERN_INFO
3986 "md: resuming recovery of %s from checkpoint.\n",
3987 mdname(mddev));
3988 mddev->curr_resync = j;
3989 }
3990
3991 while (j < max_sectors) {
57afd89f 3992 sector_t sectors;
1da177e4 3993
57afd89f
N		 3994 skipped = 0;
3995 sectors = mddev->pers->sync_request(mddev, j, &skipped,
3996 currspeed < sysctl_speed_limit_min);
3997 if (sectors == 0) {
1da177e4
LT		 3998 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
3999 goto out;
4000 }
57afd89f
N		 4001
4002 if (!skipped) { /* actual IO requested */
4003 io_sectors += sectors;
4004 atomic_add(sectors, &mddev->recovery_active);
4005 }
4006
1da177e4
LT		 4007 j += sectors;
4008 if (j>1) mddev->curr_resync = j;
4009
57afd89f
N		 4010
4011 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 4012 continue;
4013
57afd89f 4014 last_check = io_sectors;
1da177e4
LT		 4015
4016 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
4017 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
4018 break;
4019
4020 repeat:
4021 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
4022 /* step marks */
4023 int next = (last_mark+1) % SYNC_MARKS;
4024
4025 mddev->resync_mark = mark[next];
4026 mddev->resync_mark_cnt = mark_cnt[next];
4027 mark[next] = jiffies;
57afd89f 4028 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 4029 last_mark = next;
4030 }
4031
4032
8712e553 4033 if (signal_pending(current) || kthread_should_stop()) {
1da177e4
LT		 4034 /*
4035 * got a signal, exit.
4036 */
4037 printk(KERN_INFO
4038 "md: md_do_sync() got signal ... exiting\n");
4039 flush_signals(current);
4040 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4041 goto out;
4042 }
4043
4044 /*
4045 * this loop exits only if either when we are slower than
4046 * the 'hard' speed limit, or the system was IO-idle for
4047 * a jiffy.
4048 * the system might be non-idle CPU-wise, but we only care
4049 * about not overloading the IO subsystem. (things like an
4050 * e2fsck being done on the RAID array should execute fast)
4051 */
4052 mddev->queue->unplug_fn(mddev->queue);
4053 cond_resched();
4054
57afd89f
N		 4055 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
4056 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4
LT		 4057
4058 if (currspeed > sysctl_speed_limit_min) {
4059 if ((currspeed > sysctl_speed_limit_max) ||
4060 !is_mddev_idle(mddev)) {
4061 msleep_interruptible(250);
4062 goto repeat;
4063 }
4064 }
4065 }
4066 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
4067 /*
4068 * this also signals 'finished resyncing' to md_stop
4069 */
4070 out:
4071 mddev->queue->unplug_fn(mddev->queue);
4072
4073 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
4074
4075 /* tell personality that we are finished */
57afd89f 4076 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 4077
4078 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4079 mddev->curr_resync > 2 &&
4080 mddev->curr_resync >= mddev->recovery_cp) {
4081 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4082 printk(KERN_INFO
4083 "md: checkpointing recovery of %s.\n",
4084 mdname(mddev));
4085 mddev->recovery_cp = mddev->curr_resync;
4086 } else
4087 mddev->recovery_cp = MaxSector;
4088 }
4089
1da177e4
LT		 4090 skip:
4091 mddev->curr_resync = 0;
4092 wake_up(&resync_wait);
4093 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
4094 md_wakeup_thread(mddev->thread);
4095}
4096
4097
4098/*
4099 * This routine is regularly called by all per-raid-array threads to
4100 * deal with generic issues like resync and super-block update.
4101 * Raid personalities that don't have a thread (linear/raid0) do not
4102 * need this as they never do any recovery or update the superblock.
4103 *
4104 * It does not do any resync itself, but rather "forks" off other threads
4105 * to do that as needed.
4106 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4107 * "->recovery" and create a thread at ->sync_thread.
4108 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4109 * and wakeups up this thread which will reap the thread and finish up.
4110 * This thread also removes any faulty devices (with nr_pending == 0).
4111 *
4112 * The overall approach is:
4113 * 1/ if the superblock needs updating, update it.
4114 * 2/ If a recovery thread is running, don't do anything else.
4115 * 3/ If recovery has finished, clean up, possibly marking spares active.
4116 * 4/ If there are any faulty devices, remove them.
4117 * 5/ If array is degraded, try to add spares devices
4118 * 6/ If array has spares or is not in-sync, start a resync thread.
4119 */
4120void md_check_recovery(mddev_t *mddev)
4121{
4122 mdk_rdev_t *rdev;
4123 struct list_head *rtmp;
4124
4125
5f40402d
N		 4126 if (mddev->bitmap)
4127 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 4128
4129 if (mddev->ro)
4130 return;
fca4d848
N		 4131
4132 if (signal_pending(current)) {
4133 if (mddev->pers->sync_request) {
4134 printk(KERN_INFO "md: %s in immediate safe mode\n",
4135 mdname(mddev));
4136 mddev->safemode = 2;
4137 }
4138 flush_signals(current);
4139 }
4140
1da177e4
LT		 4141 if ( ! (
4142 mddev->sb_dirty ||
4143 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848
N		 4144 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
4145 (mddev->safemode == 1) ||
4146 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
4147 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 4148 ))
4149 return;
fca4d848 4150
1da177e4
LT		 4151 if (mddev_trylock(mddev)==0) {
4152 int spares =0;
fca4d848 4153
a9701a30 4154 spin_lock_irq(&mddev->write_lock);
fca4d848
N		 4155 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
4156 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
4157 mddev->in_sync = 1;
4158 mddev->sb_dirty = 1;
4159 }
4160 if (mddev->safemode == 1)
4161 mddev->safemode = 0;
a9701a30 4162 spin_unlock_irq(&mddev->write_lock);
fca4d848 4163
1da177e4
LT		 4164 if (mddev->sb_dirty)
4165 md_update_sb(mddev);
06d91a5f 4166
06d91a5f 4167
1da177e4
LT		 4168 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4169 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
4170 /* resync/recovery still happening */
4171 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4172 goto unlock;
4173 }
4174 if (mddev->sync_thread) {
4175 /* resync has finished, collect result */
4176 md_unregister_thread(mddev->sync_thread);
4177 mddev->sync_thread = NULL;
4178 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4179 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4180 /* success...*/
4181 /* activate any spares */
4182 mddev->pers->spare_active(mddev);
4183 }
4184 md_update_sb(mddev);
41158c7e
N		 4185
4186 /* if array is no-longer degraded, then any saved_raid_disk
4187 * information must be scrapped
4188 */
4189 if (!mddev->degraded)
4190 ITERATE_RDEV(mddev,rdev,rtmp)
4191 rdev->saved_raid_disk = -1;
4192
1da177e4
LT		 4193 mddev->recovery = 0;
4194 /* flag recovery needed just to double check */
4195 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4196 goto unlock;
4197 }
24dd469d
N		 4198 /* Clear some bits that don't mean anything, but
4199 * might be left set
4200 */
4201 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4202 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
4203 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
4204 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4
LT		 4205
4206 /* no recovery is running.
4207 * remove any failed drives, then
4208 * add spares if possible.
4209 * Spare are also removed and re-added, to allow
4210 * the personality to fail the re-add.
4211 */
4212 ITERATE_RDEV(mddev,rdev,rtmp)
4213 if (rdev->raid_disk >= 0 &&
b2d444d7 4214 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
1da177e4 4215 atomic_read(&rdev->nr_pending)==0) {
86e6ffdd
N		 4216 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
4217 char nm[20];
4218 sprintf(nm,"rd%d", rdev->raid_disk);
4219 sysfs_remove_link(&mddev->kobj, nm);
1da177e4 4220 rdev->raid_disk = -1;
86e6ffdd 4221 }
1da177e4
LT		 4222 }
4223
4224 if (mddev->degraded) {
4225 ITERATE_RDEV(mddev,rdev,rtmp)
4226 if (rdev->raid_disk < 0
b2d444d7 4227 && !test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 4228 if (mddev->pers->hot_add_disk(mddev,rdev)) {
4229 char nm[20];
4230 sprintf(nm, "rd%d", rdev->raid_disk);
4231 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
1da177e4 4232 spares++;
86e6ffdd 4233 } else
1da177e4
LT		 4234 break;
4235 }
4236 }
4237
24dd469d
N		 4238 if (spares) {
4239 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4240 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4241 } else if (mddev->recovery_cp < MaxSector) {
4242 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4243 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4244 /* nothing to be done ... */
1da177e4 4245 goto unlock;
24dd469d 4246
1da177e4
LT		 4247 if (mddev->pers->sync_request) {
4248 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 4249 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
4250 /* We are adding a device or devices to an array
4251 * which has the bitmap stored on all devices.
4252 * So make sure all bitmap pages get written
4253 */
4254 bitmap_write_all(mddev->bitmap);
4255 }
1da177e4
LT		 4256 mddev->sync_thread = md_register_thread(md_do_sync,
4257 mddev,
4258 "%s_resync");
4259 if (!mddev->sync_thread) {
4260 printk(KERN_ERR "%s: could not start resync"
4261 " thread...\n",
4262 mdname(mddev));
4263 /* leave the spares where they are, it shouldn't hurt */
4264 mddev->recovery = 0;
4265 } else {
4266 md_wakeup_thread(mddev->sync_thread);
4267 }
4268 }
4269 unlock:
4270 mddev_unlock(mddev);
4271 }
4272}
4273
75c96f85
AB		 4274static int md_notify_reboot(struct notifier_block *this,
4275 unsigned long code, void *x)
1da177e4
LT		 4276{
4277 struct list_head *tmp;
4278 mddev_t *mddev;
4279
4280 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
4281
4282 printk(KERN_INFO "md: stopping all md devices.\n");
4283
4284 ITERATE_MDDEV(mddev,tmp)
4285 if (mddev_trylock(mddev)==0)
4286 do_md_stop (mddev, 1);
4287 /*
4288 * certain more exotic SCSI devices are known to be
4289 * volatile wrt too early system reboots. While the
4290 * right place to handle this issue is the given
4291 * driver, we do want to have a safe RAID driver ...
4292 */
4293 mdelay(1000*1);
4294 }
4295 return NOTIFY_DONE;
4296}
4297
75c96f85 4298static struct notifier_block md_notifier = {
1da177e4
LT		 4299 .notifier_call = md_notify_reboot,
4300 .next = NULL,
4301 .priority = INT_MAX, /* before any real devices */
4302};
4303
4304static void md_geninit(void)
4305{
4306 struct proc_dir_entry *p;
4307
4308 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
4309
4310 p = create_proc_entry("mdstat", S_IRUGO, NULL);
4311 if (p)
4312 p->proc_fops = &md_seq_fops;
4313}
4314
75c96f85 4315static int __init md_init(void)
1da177e4
LT		 4316{
4317 int minor;
4318
4319 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4320 " MD_SB_DISKS=%d\n",
4321 MD_MAJOR_VERSION, MD_MINOR_VERSION,
4322 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
bd926c63 4323 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
32a7627c 4324 BITMAP_MINOR);
1da177e4
LT		 4325
4326 if (register_blkdev(MAJOR_NR, "md"))
4327 return -1;
4328 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
4329 unregister_blkdev(MAJOR_NR, "md");
4330 return -1;
4331 }
4332 devfs_mk_dir("md");
4333 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
4334 md_probe, NULL, NULL);
4335 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
4336 md_probe, NULL, NULL);
4337
4338 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4339 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
4340 S_IFBLK|S_IRUSR|S_IWUSR,
4341 "md/%d", minor);
4342
4343 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4344 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
4345 S_IFBLK|S_IRUSR|S_IWUSR,
4346 "md/mdp%d", minor);
4347
4348
4349 register_reboot_notifier(&md_notifier);
4350 raid_table_header = register_sysctl_table(raid_root_table, 1);
4351
4352 md_geninit();
4353 return (0);
4354}
4355
4356
4357#ifndef MODULE
4358
4359/*
4360 * Searches all registered partitions for autorun RAID arrays
4361 * at boot time.
4362 */
4363static dev_t detected_devices[128];
4364static int dev_cnt;
4365
4366void md_autodetect_dev(dev_t dev)
4367{
4368 if (dev_cnt >= 0 && dev_cnt < 127)
4369 detected_devices[dev_cnt++] = dev;
4370}
4371
4372
4373static void autostart_arrays(int part)
4374{
4375 mdk_rdev_t *rdev;
4376 int i;
4377
4378 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
4379
4380 for (i = 0; i < dev_cnt; i++) {
4381 dev_t dev = detected_devices[i];
4382
4383 rdev = md_import_device(dev,0, 0);
4384 if (IS_ERR(rdev))
4385 continue;
4386
b2d444d7 4387 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4388 MD_BUG();
4389 continue;
4390 }
4391 list_add(&rdev->same_set, &pending_raid_disks);
4392 }
4393 dev_cnt = 0;
4394
4395 autorun_devices(part);
4396}
4397
4398#endif
4399
4400static __exit void md_exit(void)
4401{
4402 mddev_t *mddev;
4403 struct list_head *tmp;
4404 int i;
4405 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
4406 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
4407 for (i=0; i < MAX_MD_DEVS; i++)
4408 devfs_remove("md/%d", i);
4409 for (i=0; i < MAX_MD_DEVS; i++)
4410 devfs_remove("md/d%d", i);
4411
4412 devfs_remove("md");
4413
4414 unregister_blkdev(MAJOR_NR,"md");
4415 unregister_blkdev(mdp_major, "mdp");
4416 unregister_reboot_notifier(&md_notifier);
4417 unregister_sysctl_table(raid_table_header);
4418 remove_proc_entry("mdstat", NULL);
4419 ITERATE_MDDEV(mddev,tmp) {
4420 struct gendisk *disk = mddev->gendisk;
4421 if (!disk)
4422 continue;
4423 export_array(mddev);
4424 del_gendisk(disk);
4425 put_disk(disk);
4426 mddev->gendisk = NULL;
4427 mddev_put(mddev);
4428 }
4429}
4430
4431module_init(md_init)
4432module_exit(md_exit)
4433
4434EXPORT_SYMBOL(register_md_personality);
4435EXPORT_SYMBOL(unregister_md_personality);
4436EXPORT_SYMBOL(md_error);
4437EXPORT_SYMBOL(md_done_sync);
4438EXPORT_SYMBOL(md_write_start);
4439EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 4440EXPORT_SYMBOL(md_register_thread);
4441EXPORT_SYMBOL(md_unregister_thread);
4442EXPORT_SYMBOL(md_wakeup_thread);
4443EXPORT_SYMBOL(md_print_devices);
4444EXPORT_SYMBOL(md_check_recovery);
4445MODULE_LICENSE("GPL");
aa1595e9 4446MODULE_ALIAS("md");
72008652 4447MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
kernel source for telekom puls (alcatel/mediatek)