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[PATCH] md: expose md metadata format in sysfs
[mirror_ubuntu-eoan-kernel.git] / drivers / md / md.c
CommitLineData
1da177e4
LT		 1/*
2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
4
5 completely rewritten, based on the MD driver code from Marc Zyngier
6
7 Changes:
8
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
16
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
19
20 Neil Brown <neilb@cse.unsw.edu.au>.
21
32a7627c
N		 22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
24
1da177e4
LT		 25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
28 any later version.
29
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
33*/
34
35#include <linux/module.h>
36#include <linux/config.h>
a6fb0934 37#include <linux/kthread.h>
1da177e4
LT		 38#include <linux/linkage.h>
39#include <linux/raid/md.h>
32a7627c 40#include <linux/raid/bitmap.h>
1da177e4
LT		 41#include <linux/sysctl.h>
42#include <linux/devfs_fs_kernel.h>
43#include <linux/buffer_head.h> /* for invalidate_bdev */
44#include <linux/suspend.h>
d7603b7e 45#include <linux/poll.h>
1da177e4
LT		 46
47#include <linux/init.h>
48
32a7627c
N		 49#include <linux/file.h>
50
1da177e4
LT		 51#ifdef CONFIG_KMOD
52#include <linux/kmod.h>
53#endif
54
55#include <asm/unaligned.h>
56
57#define MAJOR_NR MD_MAJOR
58#define MD_DRIVER
59
60/* 63 partitions with the alternate major number (mdp) */
61#define MdpMinorShift 6
62
63#define DEBUG 0
64#define dprintk(x...) ((void)(DEBUG && printk(x)))
65
66
67#ifndef MODULE
68static void autostart_arrays (int part);
69#endif
70
2604b703 71static LIST_HEAD(pers_list);
1da177e4
LT		 72static DEFINE_SPINLOCK(pers_lock);
73
74/*
75 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
76 * is 1000 KB/sec, so the extra system load does not show up that much.
77 * Increase it if you want to have more _guaranteed_ speed. Note that
338cec32 78 * the RAID driver will use the maximum available bandwidth if the IO
1da177e4
LT		 79 * subsystem is idle. There is also an 'absolute maximum' reconstruction
80 * speed limit - in case reconstruction slows down your system despite
81 * idle IO detection.
82 *
83 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
84 */
85
86static int sysctl_speed_limit_min = 1000;
87static int sysctl_speed_limit_max = 200000;
88
89static struct ctl_table_header *raid_table_header;
90
91static ctl_table raid_table[] = {
92 {
93 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
94 .procname = "speed_limit_min",
95 .data = &sysctl_speed_limit_min,
96 .maxlen = sizeof(int),
97 .mode = 0644,
98 .proc_handler = &proc_dointvec,
99 },
100 {
101 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
102 .procname = "speed_limit_max",
103 .data = &sysctl_speed_limit_max,
104 .maxlen = sizeof(int),
105 .mode = 0644,
106 .proc_handler = &proc_dointvec,
107 },
108 { .ctl_name = 0 }
109};
110
111static ctl_table raid_dir_table[] = {
112 {
113 .ctl_name = DEV_RAID,
114 .procname = "raid",
115 .maxlen = 0,
116 .mode = 0555,
117 .child = raid_table,
118 },
119 { .ctl_name = 0 }
120};
121
122static ctl_table raid_root_table[] = {
123 {
124 .ctl_name = CTL_DEV,
125 .procname = "dev",
126 .maxlen = 0,
127 .mode = 0555,
128 .child = raid_dir_table,
129 },
130 { .ctl_name = 0 }
131};
132
133static struct block_device_operations md_fops;
134
f91de92e
N		 135static int start_readonly;
136
d7603b7e
N		 137/*
138 * We have a system wide 'event count' that is incremented
139 * on any 'interesting' event, and readers of /proc/mdstat
140 * can use 'poll' or 'select' to find out when the event
141 * count increases.
142 *
143 * Events are:
144 * start array, stop array, error, add device, remove device,
145 * start build, activate spare
146 */
2989ddbd 147static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
d7603b7e 148static atomic_t md_event_count;
07dbd377 149static void md_new_event(mddev_t *mddev)
d7603b7e
N		 150{
151 atomic_inc(&md_event_count);
152 wake_up(&md_event_waiters);
153}
154
1da177e4
LT		 155/*
156 * Enables to iterate over all existing md arrays
157 * all_mddevs_lock protects this list.
158 */
159static LIST_HEAD(all_mddevs);
160static DEFINE_SPINLOCK(all_mddevs_lock);
161
162
163/*
164 * iterates through all used mddevs in the system.
165 * We take care to grab the all_mddevs_lock whenever navigating
166 * the list, and to always hold a refcount when unlocked.
167 * Any code which breaks out of this loop while own
168 * a reference to the current mddev and must mddev_put it.
169 */
170#define ITERATE_MDDEV(mddev,tmp) \
171 \
172 for (({ spin_lock(&all_mddevs_lock); \
173 tmp = all_mddevs.next; \
174 mddev = NULL;}); \
175 ({ if (tmp != &all_mddevs) \
176 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
177 spin_unlock(&all_mddevs_lock); \
178 if (mddev) mddev_put(mddev); \
179 mddev = list_entry(tmp, mddev_t, all_mddevs); \
180 tmp != &all_mddevs;}); \
181 ({ spin_lock(&all_mddevs_lock); \
182 tmp = tmp->next;}) \
183 )
184
185
186static int md_fail_request (request_queue_t *q, struct bio *bio)
187{
188 bio_io_error(bio, bio->bi_size);
189 return 0;
190}
191
192static inline mddev_t *mddev_get(mddev_t *mddev)
193{
194 atomic_inc(&mddev->active);
195 return mddev;
196}
197
198static void mddev_put(mddev_t *mddev)
199{
200 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
201 return;
202 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
203 list_del(&mddev->all_mddevs);
204 blk_put_queue(mddev->queue);
eae1701f 205 kobject_unregister(&mddev->kobj);
1da177e4
LT		 206 }
207 spin_unlock(&all_mddevs_lock);
208}
209
210static mddev_t * mddev_find(dev_t unit)
211{
212 mddev_t *mddev, *new = NULL;
213
214 retry:
215 spin_lock(&all_mddevs_lock);
216 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
217 if (mddev->unit == unit) {
218 mddev_get(mddev);
219 spin_unlock(&all_mddevs_lock);
990a8baf 220 kfree(new);
1da177e4
LT		 221 return mddev;
222 }
223
224 if (new) {
225 list_add(&new->all_mddevs, &all_mddevs);
226 spin_unlock(&all_mddevs_lock);
227 return new;
228 }
229 spin_unlock(&all_mddevs_lock);
230
9ffae0cf 231 new = kzalloc(sizeof(*new), GFP_KERNEL);
1da177e4
LT		 232 if (!new)
233 return NULL;
234
1da177e4
LT		 235 new->unit = unit;
236 if (MAJOR(unit) == MD_MAJOR)
237 new->md_minor = MINOR(unit);
238 else
239 new->md_minor = MINOR(unit) >> MdpMinorShift;
240
241 init_MUTEX(&new->reconfig_sem);
242 INIT_LIST_HEAD(&new->disks);
243 INIT_LIST_HEAD(&new->all_mddevs);
244 init_timer(&new->safemode_timer);
245 atomic_set(&new->active, 1);
06d91a5f 246 spin_lock_init(&new->write_lock);
3d310eb7 247 init_waitqueue_head(&new->sb_wait);
1da177e4
LT		 248
249 new->queue = blk_alloc_queue(GFP_KERNEL);
250 if (!new->queue) {
251 kfree(new);
252 return NULL;
253 }
254
255 blk_queue_make_request(new->queue, md_fail_request);
256
257 goto retry;
258}
259
260static inline int mddev_lock(mddev_t * mddev)
261{
262 return down_interruptible(&mddev->reconfig_sem);
263}
264
265static inline void mddev_lock_uninterruptible(mddev_t * mddev)
266{
267 down(&mddev->reconfig_sem);
268}
269
270static inline int mddev_trylock(mddev_t * mddev)
271{
272 return down_trylock(&mddev->reconfig_sem);
273}
274
275static inline void mddev_unlock(mddev_t * mddev)
276{
277 up(&mddev->reconfig_sem);
278
005eca5e 279 md_wakeup_thread(mddev->thread);
1da177e4
LT		 280}
281
2989ddbd 282static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
1da177e4
LT		 283{
284 mdk_rdev_t * rdev;
285 struct list_head *tmp;
286
287 ITERATE_RDEV(mddev,rdev,tmp) {
288 if (rdev->desc_nr == nr)
289 return rdev;
290 }
291 return NULL;
292}
293
294static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
295{
296 struct list_head *tmp;
297 mdk_rdev_t *rdev;
298
299 ITERATE_RDEV(mddev,rdev,tmp) {
300 if (rdev->bdev->bd_dev == dev)
301 return rdev;
302 }
303 return NULL;
304}
305
2604b703
N		 306static struct mdk_personality *find_pers(int level)
307{
308 struct mdk_personality *pers;
309 list_for_each_entry(pers, &pers_list, list)
310 if (pers->level == level)
311 return pers;
312 return NULL;
313}
314
77933d72 315static inline sector_t calc_dev_sboffset(struct block_device *bdev)
1da177e4
LT		 316{
317 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
318 return MD_NEW_SIZE_BLOCKS(size);
319}
320
321static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
322{
323 sector_t size;
324
325 size = rdev->sb_offset;
326
327 if (chunk_size)
328 size &= ~((sector_t)chunk_size/1024 - 1);
329 return size;
330}
331
332static int alloc_disk_sb(mdk_rdev_t * rdev)
333{
334 if (rdev->sb_page)
335 MD_BUG();
336
337 rdev->sb_page = alloc_page(GFP_KERNEL);
338 if (!rdev->sb_page) {
339 printk(KERN_ALERT "md: out of memory.\n");
340 return -EINVAL;
341 }
342
343 return 0;
344}
345
346static void free_disk_sb(mdk_rdev_t * rdev)
347{
348 if (rdev->sb_page) {
2d1f3b5d 349 put_page(rdev->sb_page);
1da177e4
LT		 350 rdev->sb_loaded = 0;
351 rdev->sb_page = NULL;
352 rdev->sb_offset = 0;
353 rdev->size = 0;
354 }
355}
356
357
7bfa19f2
N		 358static int super_written(struct bio *bio, unsigned int bytes_done, int error)
359{
360 mdk_rdev_t *rdev = bio->bi_private;
a9701a30 361 mddev_t *mddev = rdev->mddev;
7bfa19f2
N		 362 if (bio->bi_size)
363 return 1;
364
365 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags))
a9701a30 366 md_error(mddev, rdev);
7bfa19f2 367
a9701a30
N		 368 if (atomic_dec_and_test(&mddev->pending_writes))
369 wake_up(&mddev->sb_wait);
f8b58edf 370 bio_put(bio);
7bfa19f2
N		 371 return 0;
372}
373
a9701a30
N		 374static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
375{
376 struct bio *bio2 = bio->bi_private;
377 mdk_rdev_t *rdev = bio2->bi_private;
378 mddev_t *mddev = rdev->mddev;
379 if (bio->bi_size)
380 return 1;
381
382 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
383 error == -EOPNOTSUPP) {
384 unsigned long flags;
385 /* barriers don't appear to be supported :-( */
386 set_bit(BarriersNotsupp, &rdev->flags);
387 mddev->barriers_work = 0;
388 spin_lock_irqsave(&mddev->write_lock, flags);
389 bio2->bi_next = mddev->biolist;
390 mddev->biolist = bio2;
391 spin_unlock_irqrestore(&mddev->write_lock, flags);
392 wake_up(&mddev->sb_wait);
393 bio_put(bio);
394 return 0;
395 }
396 bio_put(bio2);
397 bio->bi_private = rdev;
398 return super_written(bio, bytes_done, error);
399}
400
7bfa19f2
N		 401void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
402 sector_t sector, int size, struct page *page)
403{
404 /* write first size bytes of page to sector of rdev
405 * Increment mddev->pending_writes before returning
406 * and decrement it on completion, waking up sb_wait
407 * if zero is reached.
408 * If an error occurred, call md_error
a9701a30
N		 409 *
410 * As we might need to resubmit the request if BIO_RW_BARRIER
411 * causes ENOTSUPP, we allocate a spare bio...
7bfa19f2
N		 412 */
413 struct bio *bio = bio_alloc(GFP_NOIO, 1);
a9701a30 414 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
7bfa19f2
N		 415
416 bio->bi_bdev = rdev->bdev;
417 bio->bi_sector = sector;
418 bio_add_page(bio, page, size, 0);
419 bio->bi_private = rdev;
420 bio->bi_end_io = super_written;
a9701a30
N		 421 bio->bi_rw = rw;
422
7bfa19f2 423 atomic_inc(&mddev->pending_writes);
a9701a30
N		 424 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
425 struct bio *rbio;
426 rw |= (1<<BIO_RW_BARRIER);
427 rbio = bio_clone(bio, GFP_NOIO);
428 rbio->bi_private = bio;
429 rbio->bi_end_io = super_written_barrier;
430 submit_bio(rw, rbio);
431 } else
432 submit_bio(rw, bio);
433}
434
435void md_super_wait(mddev_t *mddev)
436{
437 /* wait for all superblock writes that were scheduled to complete.
438 * if any had to be retried (due to BARRIER problems), retry them
439 */
440 DEFINE_WAIT(wq);
441 for(;;) {
442 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
443 if (atomic_read(&mddev->pending_writes)==0)
444 break;
445 while (mddev->biolist) {
446 struct bio *bio;
447 spin_lock_irq(&mddev->write_lock);
448 bio = mddev->biolist;
449 mddev->biolist = bio->bi_next ;
450 bio->bi_next = NULL;
451 spin_unlock_irq(&mddev->write_lock);
452 submit_bio(bio->bi_rw, bio);
453 }
454 schedule();
455 }
456 finish_wait(&mddev->sb_wait, &wq);
7bfa19f2
N		 457}
458
1da177e4
LT		 459static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
460{
461 if (bio->bi_size)
462 return 1;
463
464 complete((struct completion*)bio->bi_private);
465 return 0;
466}
467
a654b9d8 468int sync_page_io(struct block_device *bdev, sector_t sector, int size,
1da177e4
LT		 469 struct page *page, int rw)
470{
baaa2c51 471 struct bio *bio = bio_alloc(GFP_NOIO, 1);
1da177e4
LT		 472 struct completion event;
473 int ret;
474
475 rw |= (1 << BIO_RW_SYNC);
476
477 bio->bi_bdev = bdev;
478 bio->bi_sector = sector;
479 bio_add_page(bio, page, size, 0);
480 init_completion(&event);
481 bio->bi_private = &event;
482 bio->bi_end_io = bi_complete;
483 submit_bio(rw, bio);
484 wait_for_completion(&event);
485
486 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
487 bio_put(bio);
488 return ret;
489}
a8745db2 490EXPORT_SYMBOL_GPL(sync_page_io);
1da177e4 491
0002b271 492static int read_disk_sb(mdk_rdev_t * rdev, int size)
1da177e4
LT		 493{
494 char b[BDEVNAME_SIZE];
495 if (!rdev->sb_page) {
496 MD_BUG();
497 return -EINVAL;
498 }
499 if (rdev->sb_loaded)
500 return 0;
501
502
0002b271 503 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
1da177e4
LT		 504 goto fail;
505 rdev->sb_loaded = 1;
506 return 0;
507
508fail:
509 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
510 bdevname(rdev->bdev,b));
511 return -EINVAL;
512}
513
514static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
515{
516 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
517 (sb1->set_uuid1 == sb2->set_uuid1) &&
518 (sb1->set_uuid2 == sb2->set_uuid2) &&
519 (sb1->set_uuid3 == sb2->set_uuid3))
520
521 return 1;
522
523 return 0;
524}
525
526
527static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
528{
529 int ret;
530 mdp_super_t *tmp1, *tmp2;
531
532 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
533 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
534
535 if (!tmp1 || !tmp2) {
536 ret = 0;
537 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
538 goto abort;
539 }
540
541 *tmp1 = *sb1;
542 *tmp2 = *sb2;
543
544 /*
545 * nr_disks is not constant
546 */
547 tmp1->nr_disks = 0;
548 tmp2->nr_disks = 0;
549
550 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
551 ret = 0;
552 else
553 ret = 1;
554
555abort:
990a8baf
JJ		 556 kfree(tmp1);
557 kfree(tmp2);
1da177e4
LT		 558 return ret;
559}
560
561static unsigned int calc_sb_csum(mdp_super_t * sb)
562{
563 unsigned int disk_csum, csum;
564
565 disk_csum = sb->sb_csum;
566 sb->sb_csum = 0;
567 csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
568 sb->sb_csum = disk_csum;
569 return csum;
570}
571
572
573/*
574 * Handle superblock details.
575 * We want to be able to handle multiple superblock formats
576 * so we have a common interface to them all, and an array of
577 * different handlers.
578 * We rely on user-space to write the initial superblock, and support
579 * reading and updating of superblocks.
580 * Interface methods are:
581 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
582 * loads and validates a superblock on dev.
583 * if refdev != NULL, compare superblocks on both devices
584 * Return:
585 * 0 - dev has a superblock that is compatible with refdev
586 * 1 - dev has a superblock that is compatible and newer than refdev
587 * so dev should be used as the refdev in future
588 * -EINVAL superblock incompatible or invalid
589 * -othererror e.g. -EIO
590 *
591 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
592 * Verify that dev is acceptable into mddev.
593 * The first time, mddev->raid_disks will be 0, and data from
594 * dev should be merged in. Subsequent calls check that dev
595 * is new enough. Return 0 or -EINVAL
596 *
597 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
598 * Update the superblock for rdev with data in mddev
599 * This does not write to disc.
600 *
601 */
602
603struct super_type {
604 char *name;
605 struct module *owner;
606 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
607 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
608 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
609};
610
611/*
612 * load_super for 0.90.0
613 */
614static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
615{
616 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
617 mdp_super_t *sb;
618 int ret;
619 sector_t sb_offset;
620
621 /*
622 * Calculate the position of the superblock,
623 * it's at the end of the disk.
624 *
625 * It also happens to be a multiple of 4Kb.
626 */
627 sb_offset = calc_dev_sboffset(rdev->bdev);
628 rdev->sb_offset = sb_offset;
629
0002b271 630 ret = read_disk_sb(rdev, MD_SB_BYTES);
1da177e4
LT		 631 if (ret) return ret;
632
633 ret = -EINVAL;
634
635 bdevname(rdev->bdev, b);
636 sb = (mdp_super_t*)page_address(rdev->sb_page);
637
638 if (sb->md_magic != MD_SB_MAGIC) {
639 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
640 b);
641 goto abort;
642 }
643
644 if (sb->major_version != 0 ||
645 sb->minor_version != 90) {
646 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
647 sb->major_version, sb->minor_version,
648 b);
649 goto abort;
650 }
651
652 if (sb->raid_disks <= 0)
653 goto abort;
654
655 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
656 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
657 b);
658 goto abort;
659 }
660
661 rdev->preferred_minor = sb->md_minor;
662 rdev->data_offset = 0;
0002b271 663 rdev->sb_size = MD_SB_BYTES;
1da177e4
LT		 664
665 if (sb->level == LEVEL_MULTIPATH)
666 rdev->desc_nr = -1;
667 else
668 rdev->desc_nr = sb->this_disk.number;
669
670 if (refdev == 0)
671 ret = 1;
672 else {
673 __u64 ev1, ev2;
674 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
675 if (!uuid_equal(refsb, sb)) {
676 printk(KERN_WARNING "md: %s has different UUID to %s\n",
677 b, bdevname(refdev->bdev,b2));
678 goto abort;
679 }
680 if (!sb_equal(refsb, sb)) {
681 printk(KERN_WARNING "md: %s has same UUID"
682 " but different superblock to %s\n",
683 b, bdevname(refdev->bdev, b2));
684 goto abort;
685 }
686 ev1 = md_event(sb);
687 ev2 = md_event(refsb);
688 if (ev1 > ev2)
689 ret = 1;
690 else
691 ret = 0;
692 }
693 rdev->size = calc_dev_size(rdev, sb->chunk_size);
694
695 abort:
696 return ret;
697}
698
699/*
700 * validate_super for 0.90.0
701 */
702static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
703{
704 mdp_disk_t *desc;
705 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
706
41158c7e 707 rdev->raid_disk = -1;
b2d444d7 708 rdev->flags = 0;
1da177e4
LT		 709 if (mddev->raid_disks == 0) {
710 mddev->major_version = 0;
711 mddev->minor_version = sb->minor_version;
712 mddev->patch_version = sb->patch_version;
713 mddev->persistent = ! sb->not_persistent;
714 mddev->chunk_size = sb->chunk_size;
715 mddev->ctime = sb->ctime;
716 mddev->utime = sb->utime;
717 mddev->level = sb->level;
718 mddev->layout = sb->layout;
719 mddev->raid_disks = sb->raid_disks;
720 mddev->size = sb->size;
721 mddev->events = md_event(sb);
9223214e 722 mddev->bitmap_offset = 0;
36fa3063 723 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
1da177e4
LT		 724
725 if (sb->state & (1<<MD_SB_CLEAN))
726 mddev->recovery_cp = MaxSector;
727 else {
728 if (sb->events_hi == sb->cp_events_hi &&
729 sb->events_lo == sb->cp_events_lo) {
730 mddev->recovery_cp = sb->recovery_cp;
731 } else
732 mddev->recovery_cp = 0;
733 }
734
735 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
736 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
737 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
738 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
739
740 mddev->max_disks = MD_SB_DISKS;
a654b9d8
N		 741
742 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
743 mddev->bitmap_file == NULL) {
6cce3b23
N		 744 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
745 && mddev->level != 10) {
a654b9d8 746 /* FIXME use a better test */
6cce3b23 747 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
a654b9d8
N		 748 return -EINVAL;
749 }
36fa3063 750 mddev->bitmap_offset = mddev->default_bitmap_offset;
a654b9d8
N		 751 }
752
41158c7e
N		 753 } else if (mddev->pers == NULL) {
754 /* Insist on good event counter while assembling */
755 __u64 ev1 = md_event(sb);
1da177e4
LT		 756 ++ev1;
757 if (ev1 < mddev->events)
758 return -EINVAL;
41158c7e
N		 759 } else if (mddev->bitmap) {
760 /* if adding to array with a bitmap, then we can accept an
761 * older device ... but not too old.
762 */
763 __u64 ev1 = md_event(sb);
764 if (ev1 < mddev->bitmap->events_cleared)
765 return 0;
766 } else /* just a hot-add of a new device, leave raid_disk at -1 */
767 return 0;
768
1da177e4 769 if (mddev->level != LEVEL_MULTIPATH) {
1da177e4
LT		 770 desc = sb->disks + rdev->desc_nr;
771
772 if (desc->state & (1<<MD_DISK_FAULTY))
b2d444d7 773 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 774 else if (desc->state & (1<<MD_DISK_SYNC) &&
775 desc->raid_disk < mddev->raid_disks) {
b2d444d7 776 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 777 rdev->raid_disk = desc->raid_disk;
778 }
8ddf9efe
N		 779 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
780 set_bit(WriteMostly, &rdev->flags);
41158c7e 781 } else /* MULTIPATH are always insync */
b2d444d7 782 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 783 return 0;
784}
785
786/*
787 * sync_super for 0.90.0
788 */
789static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
790{
791 mdp_super_t *sb;
792 struct list_head *tmp;
793 mdk_rdev_t *rdev2;
794 int next_spare = mddev->raid_disks;
19133a42 795
1da177e4
LT		 796
797 /* make rdev->sb match mddev data..
798 *
799 * 1/ zero out disks
800 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
801 * 3/ any empty disks < next_spare become removed
802 *
803 * disks[0] gets initialised to REMOVED because
804 * we cannot be sure from other fields if it has
805 * been initialised or not.
806 */
807 int i;
808 int active=0, working=0,failed=0,spare=0,nr_disks=0;
809
61181565
N		 810 rdev->sb_size = MD_SB_BYTES;
811
1da177e4
LT		 812 sb = (mdp_super_t*)page_address(rdev->sb_page);
813
814 memset(sb, 0, sizeof(*sb));
815
816 sb->md_magic = MD_SB_MAGIC;
817 sb->major_version = mddev->major_version;
818 sb->minor_version = mddev->minor_version;
819 sb->patch_version = mddev->patch_version;
820 sb->gvalid_words = 0; /* ignored */
821 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
822 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
823 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
824 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
825
826 sb->ctime = mddev->ctime;
827 sb->level = mddev->level;
828 sb->size = mddev->size;
829 sb->raid_disks = mddev->raid_disks;
830 sb->md_minor = mddev->md_minor;
831 sb->not_persistent = !mddev->persistent;
832 sb->utime = mddev->utime;
833 sb->state = 0;
834 sb->events_hi = (mddev->events>>32);
835 sb->events_lo = (u32)mddev->events;
836
837 if (mddev->in_sync)
838 {
839 sb->recovery_cp = mddev->recovery_cp;
840 sb->cp_events_hi = (mddev->events>>32);
841 sb->cp_events_lo = (u32)mddev->events;
842 if (mddev->recovery_cp == MaxSector)
843 sb->state = (1<< MD_SB_CLEAN);
844 } else
845 sb->recovery_cp = 0;
846
847 sb->layout = mddev->layout;
848 sb->chunk_size = mddev->chunk_size;
849
a654b9d8
N		 850 if (mddev->bitmap && mddev->bitmap_file == NULL)
851 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
852
1da177e4
LT		 853 sb->disks[0].state = (1<<MD_DISK_REMOVED);
854 ITERATE_RDEV(mddev,rdev2,tmp) {
855 mdp_disk_t *d;
86e6ffdd 856 int desc_nr;
b2d444d7
N		 857 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
858 && !test_bit(Faulty, &rdev2->flags))
86e6ffdd 859 desc_nr = rdev2->raid_disk;
1da177e4 860 else
86e6ffdd 861 desc_nr = next_spare++;
19133a42 862 rdev2->desc_nr = desc_nr;
1da177e4
LT		 863 d = &sb->disks[rdev2->desc_nr];
864 nr_disks++;
865 d->number = rdev2->desc_nr;
866 d->major = MAJOR(rdev2->bdev->bd_dev);
867 d->minor = MINOR(rdev2->bdev->bd_dev);
b2d444d7
N		 868 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
869 && !test_bit(Faulty, &rdev2->flags))
1da177e4
LT		 870 d->raid_disk = rdev2->raid_disk;
871 else
872 d->raid_disk = rdev2->desc_nr; /* compatibility */
b2d444d7 873 if (test_bit(Faulty, &rdev2->flags)) {
1da177e4
LT		 874 d->state = (1<<MD_DISK_FAULTY);
875 failed++;
b2d444d7 876 } else if (test_bit(In_sync, &rdev2->flags)) {
1da177e4
LT		 877 d->state = (1<<MD_DISK_ACTIVE);
878 d->state |= (1<<MD_DISK_SYNC);
879 active++;
880 working++;
881 } else {
882 d->state = 0;
883 spare++;
884 working++;
885 }
8ddf9efe
N		 886 if (test_bit(WriteMostly, &rdev2->flags))
887 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4 888 }
1da177e4
LT		 889 /* now set the "removed" and "faulty" bits on any missing devices */
890 for (i=0 ; i < mddev->raid_disks ; i++) {
891 mdp_disk_t *d = &sb->disks[i];
892 if (d->state == 0 && d->number == 0) {
893 d->number = i;
894 d->raid_disk = i;
895 d->state = (1<<MD_DISK_REMOVED);
896 d->state |= (1<<MD_DISK_FAULTY);
897 failed++;
898 }
899 }
900 sb->nr_disks = nr_disks;
901 sb->active_disks = active;
902 sb->working_disks = working;
903 sb->failed_disks = failed;
904 sb->spare_disks = spare;
905
906 sb->this_disk = sb->disks[rdev->desc_nr];
907 sb->sb_csum = calc_sb_csum(sb);
908}
909
910/*
911 * version 1 superblock
912 */
913
914static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
915{
916 unsigned int disk_csum, csum;
917 unsigned long long newcsum;
918 int size = 256 + le32_to_cpu(sb->max_dev)*2;
919 unsigned int *isuper = (unsigned int*)sb;
920 int i;
921
922 disk_csum = sb->sb_csum;
923 sb->sb_csum = 0;
924 newcsum = 0;
925 for (i=0; size>=4; size -= 4 )
926 newcsum += le32_to_cpu(*isuper++);
927
928 if (size == 2)
929 newcsum += le16_to_cpu(*(unsigned short*) isuper);
930
931 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
932 sb->sb_csum = disk_csum;
933 return cpu_to_le32(csum);
934}
935
936static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
937{
938 struct mdp_superblock_1 *sb;
939 int ret;
940 sector_t sb_offset;
941 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 942 int bmask;
1da177e4
LT		 943
944 /*
945 * Calculate the position of the superblock.
946 * It is always aligned to a 4K boundary and
947 * depeding on minor_version, it can be:
948 * 0: At least 8K, but less than 12K, from end of device
949 * 1: At start of device
950 * 2: 4K from start of device.
951 */
952 switch(minor_version) {
953 case 0:
954 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
955 sb_offset -= 8*2;
39730960 956 sb_offset &= ~(sector_t)(4*2-1);
1da177e4
LT		 957 /* convert from sectors to K */
958 sb_offset /= 2;
959 break;
960 case 1:
961 sb_offset = 0;
962 break;
963 case 2:
964 sb_offset = 4;
965 break;
966 default:
967 return -EINVAL;
968 }
969 rdev->sb_offset = sb_offset;
970
0002b271
N		 971 /* superblock is rarely larger than 1K, but it can be larger,
972 * and it is safe to read 4k, so we do that
973 */
974 ret = read_disk_sb(rdev, 4096);
1da177e4
LT		 975 if (ret) return ret;
976
977
978 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
979
980 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
981 sb->major_version != cpu_to_le32(1) ||
982 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
983 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
71c0805c 984 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT		 985 return -EINVAL;
986
987 if (calc_sb_1_csum(sb) != sb->sb_csum) {
988 printk("md: invalid superblock checksum on %s\n",
989 bdevname(rdev->bdev,b));
990 return -EINVAL;
991 }
992 if (le64_to_cpu(sb->data_size) < 10) {
993 printk("md: data_size too small on %s\n",
994 bdevname(rdev->bdev,b));
995 return -EINVAL;
996 }
997 rdev->preferred_minor = 0xffff;
998 rdev->data_offset = le64_to_cpu(sb->data_offset);
999
0002b271 1000 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
720a3dc3 1001 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
0002b271
N		 1002 if (rdev->sb_size & bmask)
1003 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1004
1da177e4
LT		 1005 if (refdev == 0)
1006 return 1;
1007 else {
1008 __u64 ev1, ev2;
1009 struct mdp_superblock_1 *refsb =
1010 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1011
1012 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1013 sb->level != refsb->level ||
1014 sb->layout != refsb->layout ||
1015 sb->chunksize != refsb->chunksize) {
1016 printk(KERN_WARNING "md: %s has strangely different"
1017 " superblock to %s\n",
1018 bdevname(rdev->bdev,b),
1019 bdevname(refdev->bdev,b2));
1020 return -EINVAL;
1021 }
1022 ev1 = le64_to_cpu(sb->events);
1023 ev2 = le64_to_cpu(refsb->events);
1024
1025 if (ev1 > ev2)
1026 return 1;
1027 }
1028 if (minor_version)
1029 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1030 else
1031 rdev->size = rdev->sb_offset;
1032 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1033 return -EINVAL;
1034 rdev->size = le64_to_cpu(sb->data_size)/2;
1035 if (le32_to_cpu(sb->chunksize))
1036 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1037 return 0;
1038}
1039
1040static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1041{
1042 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1043
41158c7e 1044 rdev->raid_disk = -1;
b2d444d7 1045 rdev->flags = 0;
1da177e4
LT		 1046 if (mddev->raid_disks == 0) {
1047 mddev->major_version = 1;
1048 mddev->patch_version = 0;
1049 mddev->persistent = 1;
1050 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1051 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1052 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1053 mddev->level = le32_to_cpu(sb->level);
1054 mddev->layout = le32_to_cpu(sb->layout);
1055 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1056 mddev->size = le64_to_cpu(sb->size)/2;
1057 mddev->events = le64_to_cpu(sb->events);
9223214e 1058 mddev->bitmap_offset = 0;
53e87fbb 1059 mddev->default_bitmap_offset = 1024;
1da177e4
LT		 1060
1061 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1062 memcpy(mddev->uuid, sb->set_uuid, 16);
1063
1064 mddev->max_disks = (4096-256)/2;
a654b9d8 1065
71c0805c 1066 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
a654b9d8 1067 mddev->bitmap_file == NULL ) {
6cce3b23
N		 1068 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
1069 && mddev->level != 10) {
1070 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
a654b9d8
N		 1071 return -EINVAL;
1072 }
1073 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1074 }
41158c7e
N		 1075 } else if (mddev->pers == NULL) {
1076 /* Insist of good event counter while assembling */
1077 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4
LT		 1078 ++ev1;
1079 if (ev1 < mddev->events)
1080 return -EINVAL;
41158c7e
N		 1081 } else if (mddev->bitmap) {
1082 /* If adding to array with a bitmap, then we can accept an
1083 * older device, but not too old.
1084 */
1085 __u64 ev1 = le64_to_cpu(sb->events);
1086 if (ev1 < mddev->bitmap->events_cleared)
1087 return 0;
1088 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1089 return 0;
1da177e4
LT		 1090
1091 if (mddev->level != LEVEL_MULTIPATH) {
1092 int role;
1093 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1094 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1095 switch(role) {
1096 case 0xffff: /* spare */
1da177e4
LT		 1097 break;
1098 case 0xfffe: /* faulty */
b2d444d7 1099 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 1100 break;
1101 default:
b2d444d7 1102 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1103 rdev->raid_disk = role;
1104 break;
1105 }
8ddf9efe
N		 1106 if (sb->devflags & WriteMostly1)
1107 set_bit(WriteMostly, &rdev->flags);
41158c7e 1108 } else /* MULTIPATH are always insync */
b2d444d7 1109 set_bit(In_sync, &rdev->flags);
41158c7e 1110
1da177e4
LT		 1111 return 0;
1112}
1113
1114static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1115{
1116 struct mdp_superblock_1 *sb;
1117 struct list_head *tmp;
1118 mdk_rdev_t *rdev2;
1119 int max_dev, i;
1120 /* make rdev->sb match mddev and rdev data. */
1121
1122 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1123
1124 sb->feature_map = 0;
1125 sb->pad0 = 0;
1126 memset(sb->pad1, 0, sizeof(sb->pad1));
1127 memset(sb->pad2, 0, sizeof(sb->pad2));
1128 memset(sb->pad3, 0, sizeof(sb->pad3));
1129
1130 sb->utime = cpu_to_le64((__u64)mddev->utime);
1131 sb->events = cpu_to_le64(mddev->events);
1132 if (mddev->in_sync)
1133 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1134 else
1135 sb->resync_offset = cpu_to_le64(0);
1136
a654b9d8
N		 1137 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1138 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
71c0805c 1139 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8
N		 1140 }
1141
1da177e4
LT		 1142 max_dev = 0;
1143 ITERATE_RDEV(mddev,rdev2,tmp)
1144 if (rdev2->desc_nr+1 > max_dev)
1145 max_dev = rdev2->desc_nr+1;
1146
1147 sb->max_dev = cpu_to_le32(max_dev);
1148 for (i=0; i<max_dev;i++)
1149 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1150
1151 ITERATE_RDEV(mddev,rdev2,tmp) {
1152 i = rdev2->desc_nr;
b2d444d7 1153 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1154 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1155 else if (test_bit(In_sync, &rdev2->flags))
1da177e4
LT		 1156 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1157 else
1158 sb->dev_roles[i] = cpu_to_le16(0xffff);
1159 }
1160
1161 sb->recovery_offset = cpu_to_le64(0); /* not supported yet */
1162 sb->sb_csum = calc_sb_1_csum(sb);
1163}
1164
1165
75c96f85 1166static struct super_type super_types[] = {
1da177e4
LT		 1167 [0] = {
1168 .name = "0.90.0",
1169 .owner = THIS_MODULE,
1170 .load_super = super_90_load,
1171 .validate_super = super_90_validate,
1172 .sync_super = super_90_sync,
1173 },
1174 [1] = {
1175 .name = "md-1",
1176 .owner = THIS_MODULE,
1177 .load_super = super_1_load,
1178 .validate_super = super_1_validate,
1179 .sync_super = super_1_sync,
1180 },
1181};
1182
1183static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1184{
1185 struct list_head *tmp;
1186 mdk_rdev_t *rdev;
1187
1188 ITERATE_RDEV(mddev,rdev,tmp)
1189 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1190 return rdev;
1191
1192 return NULL;
1193}
1194
1195static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1196{
1197 struct list_head *tmp;
1198 mdk_rdev_t *rdev;
1199
1200 ITERATE_RDEV(mddev1,rdev,tmp)
1201 if (match_dev_unit(mddev2, rdev))
1202 return 1;
1203
1204 return 0;
1205}
1206
1207static LIST_HEAD(pending_raid_disks);
1208
1209static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1210{
1211 mdk_rdev_t *same_pdev;
1212 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
f637b9f9 1213 struct kobject *ko;
1da177e4
LT		 1214
1215 if (rdev->mddev) {
1216 MD_BUG();
1217 return -EINVAL;
1218 }
1219 same_pdev = match_dev_unit(mddev, rdev);
1220 if (same_pdev)
1221 printk(KERN_WARNING
1222 "%s: WARNING: %s appears to be on the same physical"
1223 " disk as %s. True\n protection against single-disk"
1224 " failure might be compromised.\n",
1225 mdname(mddev), bdevname(rdev->bdev,b),
1226 bdevname(same_pdev->bdev,b2));
1227
1228 /* Verify rdev->desc_nr is unique.
1229 * If it is -1, assign a free number, else
1230 * check number is not in use
1231 */
1232 if (rdev->desc_nr < 0) {
1233 int choice = 0;
1234 if (mddev->pers) choice = mddev->raid_disks;
1235 while (find_rdev_nr(mddev, choice))
1236 choice++;
1237 rdev->desc_nr = choice;
1238 } else {
1239 if (find_rdev_nr(mddev, rdev->desc_nr))
1240 return -EBUSY;
1241 }
19133a42
N		 1242 bdevname(rdev->bdev,b);
1243 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1244 return -ENOMEM;
1da177e4
LT		 1245
1246 list_add(&rdev->same_set, &mddev->disks);
1247 rdev->mddev = mddev;
19133a42 1248 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 1249
9c791977 1250 rdev->kobj.parent = &mddev->kobj;
86e6ffdd
N		 1251 kobject_add(&rdev->kobj);
1252
f637b9f9
N		 1253 if (rdev->bdev->bd_part)
1254 ko = &rdev->bdev->bd_part->kobj;
1255 else
1256 ko = &rdev->bdev->bd_disk->kobj;
1257 sysfs_create_link(&rdev->kobj, ko, "block");
1da177e4
LT		 1258 return 0;
1259}
1260
1261static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1262{
1263 char b[BDEVNAME_SIZE];
1264 if (!rdev->mddev) {
1265 MD_BUG();
1266 return;
1267 }
1268 list_del_init(&rdev->same_set);
1269 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1270 rdev->mddev = NULL;
86e6ffdd
N		 1271 sysfs_remove_link(&rdev->kobj, "block");
1272 kobject_del(&rdev->kobj);
1da177e4
LT		 1273}
1274
1275/*
1276 * prevent the device from being mounted, repartitioned or
1277 * otherwise reused by a RAID array (or any other kernel
1278 * subsystem), by bd_claiming the device.
1279 */
1280static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1281{
1282 int err = 0;
1283 struct block_device *bdev;
1284 char b[BDEVNAME_SIZE];
1285
1286 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1287 if (IS_ERR(bdev)) {
1288 printk(KERN_ERR "md: could not open %s.\n",
1289 __bdevname(dev, b));
1290 return PTR_ERR(bdev);
1291 }
1292 err = bd_claim(bdev, rdev);
1293 if (err) {
1294 printk(KERN_ERR "md: could not bd_claim %s.\n",
1295 bdevname(bdev, b));
1296 blkdev_put(bdev);
1297 return err;
1298 }
1299 rdev->bdev = bdev;
1300 return err;
1301}
1302
1303static void unlock_rdev(mdk_rdev_t *rdev)
1304{
1305 struct block_device *bdev = rdev->bdev;
1306 rdev->bdev = NULL;
1307 if (!bdev)
1308 MD_BUG();
1309 bd_release(bdev);
1310 blkdev_put(bdev);
1311}
1312
1313void md_autodetect_dev(dev_t dev);
1314
1315static void export_rdev(mdk_rdev_t * rdev)
1316{
1317 char b[BDEVNAME_SIZE];
1318 printk(KERN_INFO "md: export_rdev(%s)\n",
1319 bdevname(rdev->bdev,b));
1320 if (rdev->mddev)
1321 MD_BUG();
1322 free_disk_sb(rdev);
1323 list_del_init(&rdev->same_set);
1324#ifndef MODULE
1325 md_autodetect_dev(rdev->bdev->bd_dev);
1326#endif
1327 unlock_rdev(rdev);
86e6ffdd 1328 kobject_put(&rdev->kobj);
1da177e4
LT		 1329}
1330
1331static void kick_rdev_from_array(mdk_rdev_t * rdev)
1332{
1333 unbind_rdev_from_array(rdev);
1334 export_rdev(rdev);
1335}
1336
1337static void export_array(mddev_t *mddev)
1338{
1339 struct list_head *tmp;
1340 mdk_rdev_t *rdev;
1341
1342 ITERATE_RDEV(mddev,rdev,tmp) {
1343 if (!rdev->mddev) {
1344 MD_BUG();
1345 continue;
1346 }
1347 kick_rdev_from_array(rdev);
1348 }
1349 if (!list_empty(&mddev->disks))
1350 MD_BUG();
1351 mddev->raid_disks = 0;
1352 mddev->major_version = 0;
1353}
1354
1355static void print_desc(mdp_disk_t *desc)
1356{
1357 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1358 desc->major,desc->minor,desc->raid_disk,desc->state);
1359}
1360
1361static void print_sb(mdp_super_t *sb)
1362{
1363 int i;
1364
1365 printk(KERN_INFO
1366 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1367 sb->major_version, sb->minor_version, sb->patch_version,
1368 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1369 sb->ctime);
1370 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1371 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1372 sb->md_minor, sb->layout, sb->chunk_size);
1373 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1374 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1375 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1376 sb->failed_disks, sb->spare_disks,
1377 sb->sb_csum, (unsigned long)sb->events_lo);
1378
1379 printk(KERN_INFO);
1380 for (i = 0; i < MD_SB_DISKS; i++) {
1381 mdp_disk_t *desc;
1382
1383 desc = sb->disks + i;
1384 if (desc->number || desc->major || desc->minor ||
1385 desc->raid_disk || (desc->state && (desc->state != 4))) {
1386 printk(" D %2d: ", i);
1387 print_desc(desc);
1388 }
1389 }
1390 printk(KERN_INFO "md: THIS: ");
1391 print_desc(&sb->this_disk);
1392
1393}
1394
1395static void print_rdev(mdk_rdev_t *rdev)
1396{
1397 char b[BDEVNAME_SIZE];
1398 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1399 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
b2d444d7
N		 1400 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1401 rdev->desc_nr);
1da177e4
LT		 1402 if (rdev->sb_loaded) {
1403 printk(KERN_INFO "md: rdev superblock:\n");
1404 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1405 } else
1406 printk(KERN_INFO "md: no rdev superblock!\n");
1407}
1408
1409void md_print_devices(void)
1410{
1411 struct list_head *tmp, *tmp2;
1412 mdk_rdev_t *rdev;
1413 mddev_t *mddev;
1414 char b[BDEVNAME_SIZE];
1415
1416 printk("\n");
1417 printk("md: **********************************\n");
1418 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1419 printk("md: **********************************\n");
1420 ITERATE_MDDEV(mddev,tmp) {
1da177e4 1421
32a7627c
N		 1422 if (mddev->bitmap)
1423 bitmap_print_sb(mddev->bitmap);
1424 else
1425 printk("%s: ", mdname(mddev));
1da177e4
LT		 1426 ITERATE_RDEV(mddev,rdev,tmp2)
1427 printk("<%s>", bdevname(rdev->bdev,b));
1428 printk("\n");
1429
1430 ITERATE_RDEV(mddev,rdev,tmp2)
1431 print_rdev(rdev);
1432 }
1433 printk("md: **********************************\n");
1434 printk("\n");
1435}
1436
1437
1da177e4
LT		 1438static void sync_sbs(mddev_t * mddev)
1439{
1440 mdk_rdev_t *rdev;
1441 struct list_head *tmp;
1442
1443 ITERATE_RDEV(mddev,rdev,tmp) {
1444 super_types[mddev->major_version].
1445 sync_super(mddev, rdev);
1446 rdev->sb_loaded = 1;
1447 }
1448}
1449
1450static void md_update_sb(mddev_t * mddev)
1451{
7bfa19f2 1452 int err;
1da177e4
LT		 1453 struct list_head *tmp;
1454 mdk_rdev_t *rdev;
06d91a5f 1455 int sync_req;
1da177e4 1456
1da177e4 1457repeat:
a9701a30 1458 spin_lock_irq(&mddev->write_lock);
06d91a5f 1459 sync_req = mddev->in_sync;
1da177e4
LT		 1460 mddev->utime = get_seconds();
1461 mddev->events ++;
1462
1463 if (!mddev->events) {
1464 /*
1465 * oops, this 64-bit counter should never wrap.
1466 * Either we are in around ~1 trillion A.C., assuming
1467 * 1 reboot per second, or we have a bug:
1468 */
1469 MD_BUG();
1470 mddev->events --;
1471 }
7bfa19f2 1472 mddev->sb_dirty = 2;
1da177e4
LT		 1473 sync_sbs(mddev);
1474
1475 /*
1476 * do not write anything to disk if using
1477 * nonpersistent superblocks
1478 */
06d91a5f
N		 1479 if (!mddev->persistent) {
1480 mddev->sb_dirty = 0;
a9701a30 1481 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1482 wake_up(&mddev->sb_wait);
1da177e4 1483 return;
06d91a5f 1484 }
a9701a30 1485 spin_unlock_irq(&mddev->write_lock);
1da177e4
LT		 1486
1487 dprintk(KERN_INFO
1488 "md: updating %s RAID superblock on device (in sync %d)\n",
1489 mdname(mddev),mddev->in_sync);
1490
32a7627c 1491 err = bitmap_update_sb(mddev->bitmap);
1da177e4
LT		 1492 ITERATE_RDEV(mddev,rdev,tmp) {
1493 char b[BDEVNAME_SIZE];
1494 dprintk(KERN_INFO "md: ");
b2d444d7 1495 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1496 dprintk("(skipping faulty ");
1497
1498 dprintk("%s ", bdevname(rdev->bdev,b));
b2d444d7 1499 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 1500 md_super_write(mddev,rdev,
0002b271 1501 rdev->sb_offset<<1, rdev->sb_size,
7bfa19f2
N		 1502 rdev->sb_page);
1503 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1504 bdevname(rdev->bdev,b),
1505 (unsigned long long)rdev->sb_offset);
1506
1da177e4
LT		 1507 } else
1508 dprintk(")\n");
7bfa19f2 1509 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT		 1510 /* only need to write one superblock... */
1511 break;
1512 }
a9701a30 1513 md_super_wait(mddev);
7bfa19f2
N		 1514 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1515
a9701a30 1516 spin_lock_irq(&mddev->write_lock);
7bfa19f2 1517 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
06d91a5f 1518 /* have to write it out again */
a9701a30 1519 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N		 1520 goto repeat;
1521 }
1522 mddev->sb_dirty = 0;
a9701a30 1523 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1524 wake_up(&mddev->sb_wait);
06d91a5f 1525
1da177e4
LT		 1526}
1527
bce74dac
N		 1528/* words written to sysfs files may, or my not, be \n terminated.
1529 * We want to accept with case. For this we use cmd_match.
1530 */
1531static int cmd_match(const char *cmd, const char *str)
1532{
1533 /* See if cmd, written into a sysfs file, matches
1534 * str. They must either be the same, or cmd can
1535 * have a trailing newline
1536 */
1537 while (*cmd && *str && *cmd == *str) {
1538 cmd++;
1539 str++;
1540 }
1541 if (*cmd == '\n')
1542 cmd++;
1543 if (*str || *cmd)
1544 return 0;
1545 return 1;
1546}
1547
86e6ffdd
N		 1548struct rdev_sysfs_entry {
1549 struct attribute attr;
1550 ssize_t (*show)(mdk_rdev_t *, char *);
1551 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1552};
1553
1554static ssize_t
96de1e66 1555state_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1556{
1557 char *sep = "";
1558 int len=0;
1559
b2d444d7 1560 if (test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 1561 len+= sprintf(page+len, "%sfaulty",sep);
1562 sep = ",";
1563 }
b2d444d7 1564 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1565 len += sprintf(page+len, "%sin_sync",sep);
1566 sep = ",";
1567 }
b2d444d7
N		 1568 if (!test_bit(Faulty, &rdev->flags) &&
1569 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1570 len += sprintf(page+len, "%sspare", sep);
1571 sep = ",";
1572 }
1573 return len+sprintf(page+len, "\n");
1574}
1575
96de1e66
N		 1576static struct rdev_sysfs_entry
1577rdev_state = __ATTR_RO(state);
86e6ffdd
N		 1578
1579static ssize_t
96de1e66 1580super_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1581{
1582 if (rdev->sb_loaded && rdev->sb_size) {
1583 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1584 return rdev->sb_size;
1585 } else
1586 return 0;
1587}
96de1e66
N		 1588static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1589
86e6ffdd
N		 1590static struct attribute *rdev_default_attrs[] = {
1591 &rdev_state.attr,
1592 &rdev_super.attr,
1593 NULL,
1594};
1595static ssize_t
1596rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1597{
1598 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1599 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1600
1601 if (!entry->show)
1602 return -EIO;
1603 return entry->show(rdev, page);
1604}
1605
1606static ssize_t
1607rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1608 const char *page, size_t length)
1609{
1610 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1611 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1612
1613 if (!entry->store)
1614 return -EIO;
1615 return entry->store(rdev, page, length);
1616}
1617
1618static void rdev_free(struct kobject *ko)
1619{
1620 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1621 kfree(rdev);
1622}
1623static struct sysfs_ops rdev_sysfs_ops = {
1624 .show = rdev_attr_show,
1625 .store = rdev_attr_store,
1626};
1627static struct kobj_type rdev_ktype = {
1628 .release = rdev_free,
1629 .sysfs_ops = &rdev_sysfs_ops,
1630 .default_attrs = rdev_default_attrs,
1631};
1632
1da177e4
LT		 1633/*
1634 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1635 *
1636 * mark the device faulty if:
1637 *
1638 * - the device is nonexistent (zero size)
1639 * - the device has no valid superblock
1640 *
1641 * a faulty rdev _never_ has rdev->sb set.
1642 */
1643static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1644{
1645 char b[BDEVNAME_SIZE];
1646 int err;
1647 mdk_rdev_t *rdev;
1648 sector_t size;
1649
9ffae0cf 1650 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1da177e4
LT		 1651 if (!rdev) {
1652 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1653 return ERR_PTR(-ENOMEM);
1654 }
1da177e4
LT		 1655
1656 if ((err = alloc_disk_sb(rdev)))
1657 goto abort_free;
1658
1659 err = lock_rdev(rdev, newdev);
1660 if (err)
1661 goto abort_free;
1662
86e6ffdd
N		 1663 rdev->kobj.parent = NULL;
1664 rdev->kobj.ktype = &rdev_ktype;
1665 kobject_init(&rdev->kobj);
1666
1da177e4 1667 rdev->desc_nr = -1;
b2d444d7 1668 rdev->flags = 0;
1da177e4
LT		 1669 rdev->data_offset = 0;
1670 atomic_set(&rdev->nr_pending, 0);
ba22dcbf 1671 atomic_set(&rdev->read_errors, 0);
1da177e4
LT		 1672
1673 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
1674 if (!size) {
1675 printk(KERN_WARNING
1676 "md: %s has zero or unknown size, marking faulty!\n",
1677 bdevname(rdev->bdev,b));
1678 err = -EINVAL;
1679 goto abort_free;
1680 }
1681
1682 if (super_format >= 0) {
1683 err = super_types[super_format].
1684 load_super(rdev, NULL, super_minor);
1685 if (err == -EINVAL) {
1686 printk(KERN_WARNING
1687 "md: %s has invalid sb, not importing!\n",
1688 bdevname(rdev->bdev,b));
1689 goto abort_free;
1690 }
1691 if (err < 0) {
1692 printk(KERN_WARNING
1693 "md: could not read %s's sb, not importing!\n",
1694 bdevname(rdev->bdev,b));
1695 goto abort_free;
1696 }
1697 }
1698 INIT_LIST_HEAD(&rdev->same_set);
1699
1700 return rdev;
1701
1702abort_free:
1703 if (rdev->sb_page) {
1704 if (rdev->bdev)
1705 unlock_rdev(rdev);
1706 free_disk_sb(rdev);
1707 }
1708 kfree(rdev);
1709 return ERR_PTR(err);
1710}
1711
1712/*
1713 * Check a full RAID array for plausibility
1714 */
1715
1716
a757e64c 1717static void analyze_sbs(mddev_t * mddev)
1da177e4
LT		 1718{
1719 int i;
1720 struct list_head *tmp;
1721 mdk_rdev_t *rdev, *freshest;
1722 char b[BDEVNAME_SIZE];
1723
1724 freshest = NULL;
1725 ITERATE_RDEV(mddev,rdev,tmp)
1726 switch (super_types[mddev->major_version].
1727 load_super(rdev, freshest, mddev->minor_version)) {
1728 case 1:
1729 freshest = rdev;
1730 break;
1731 case 0:
1732 break;
1733 default:
1734 printk( KERN_ERR \
1735 "md: fatal superblock inconsistency in %s"
1736 " -- removing from array\n",
1737 bdevname(rdev->bdev,b));
1738 kick_rdev_from_array(rdev);
1739 }
1740
1741
1742 super_types[mddev->major_version].
1743 validate_super(mddev, freshest);
1744
1745 i = 0;
1746 ITERATE_RDEV(mddev,rdev,tmp) {
1747 if (rdev != freshest)
1748 if (super_types[mddev->major_version].
1749 validate_super(mddev, rdev)) {
1750 printk(KERN_WARNING "md: kicking non-fresh %s"
1751 " from array!\n",
1752 bdevname(rdev->bdev,b));
1753 kick_rdev_from_array(rdev);
1754 continue;
1755 }
1756 if (mddev->level == LEVEL_MULTIPATH) {
1757 rdev->desc_nr = i++;
1758 rdev->raid_disk = rdev->desc_nr;
b2d444d7 1759 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1760 }
1761 }
1762
1763
1764
1765 if (mddev->recovery_cp != MaxSector &&
1766 mddev->level >= 1)
1767 printk(KERN_ERR "md: %s: raid array is not clean"
1768 " -- starting background reconstruction\n",
1769 mdname(mddev));
1770
1da177e4
LT		 1771}
1772
eae1701f 1773static ssize_t
96de1e66 1774level_show(mddev_t *mddev, char *page)
eae1701f 1775{
2604b703 1776 struct mdk_personality *p = mddev->pers;
bb636547 1777 if (p == NULL && mddev->raid_disks == 0)
eae1701f
N		 1778 return 0;
1779 if (mddev->level >= 0)
bcb97940 1780 return sprintf(page, "raid%d\n", mddev->level);
eae1701f
N		 1781 else
1782 return sprintf(page, "%s\n", p->name);
1783}
1784
96de1e66 1785static struct md_sysfs_entry md_level = __ATTR_RO(level);
eae1701f
N		 1786
1787static ssize_t
96de1e66 1788raid_disks_show(mddev_t *mddev, char *page)
eae1701f 1789{
bb636547
N		 1790 if (mddev->raid_disks == 0)
1791 return 0;
eae1701f
N		 1792 return sprintf(page, "%d\n", mddev->raid_disks);
1793}
1794
96de1e66 1795static struct md_sysfs_entry md_raid_disks = __ATTR_RO(raid_disks);
eae1701f 1796
3b34380a
N		 1797static ssize_t
1798chunk_size_show(mddev_t *mddev, char *page)
1799{
1800 return sprintf(page, "%d\n", mddev->chunk_size);
1801}
1802
1803static ssize_t
1804chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
1805{
1806 /* can only set chunk_size if array is not yet active */
1807 char *e;
1808 unsigned long n = simple_strtoul(buf, &e, 10);
1809
1810 if (mddev->pers)
1811 return -EBUSY;
1812 if (!*buf || (*e && *e != '\n'))
1813 return -EINVAL;
1814
1815 mddev->chunk_size = n;
1816 return len;
1817}
1818static struct md_sysfs_entry md_chunk_size =
1819__ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
1820
1821
a35b0d69
N		 1822static ssize_t
1823size_show(mddev_t *mddev, char *page)
1824{
1825 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
1826}
1827
1828static int update_size(mddev_t *mddev, unsigned long size);
1829
1830static ssize_t
1831size_store(mddev_t *mddev, const char *buf, size_t len)
1832{
1833 /* If array is inactive, we can reduce the component size, but
1834 * not increase it (except from 0).
1835 * If array is active, we can try an on-line resize
1836 */
1837 char *e;
1838 int err = 0;
1839 unsigned long long size = simple_strtoull(buf, &e, 10);
1840 if (!*buf || *buf == '\n' ||
1841 (*e && *e != '\n'))
1842 return -EINVAL;
1843
1844 if (mddev->pers) {
1845 err = update_size(mddev, size);
1846 md_update_sb(mddev);
1847 } else {
1848 if (mddev->size == 0 ||
1849 mddev->size > size)
1850 mddev->size = size;
1851 else
1852 err = -ENOSPC;
1853 }
1854 return err ? err : len;
1855}
1856
1857static struct md_sysfs_entry md_size =
1858__ATTR(component_size, 0644, size_show, size_store);
1859
8bb93aac
N		 1860
1861/* Metdata version.
1862 * This is either 'none' for arrays with externally managed metadata,
1863 * or N.M for internally known formats
1864 */
1865static ssize_t
1866metadata_show(mddev_t *mddev, char *page)
1867{
1868 if (mddev->persistent)
1869 return sprintf(page, "%d.%d\n",
1870 mddev->major_version, mddev->minor_version);
1871 else
1872 return sprintf(page, "none\n");
1873}
1874
1875static ssize_t
1876metadata_store(mddev_t *mddev, const char *buf, size_t len)
1877{
1878 int major, minor;
1879 char *e;
1880 if (!list_empty(&mddev->disks))
1881 return -EBUSY;
1882
1883 if (cmd_match(buf, "none")) {
1884 mddev->persistent = 0;
1885 mddev->major_version = 0;
1886 mddev->minor_version = 90;
1887 return len;
1888 }
1889 major = simple_strtoul(buf, &e, 10);
1890 if (e==buf || *e != '.')
1891 return -EINVAL;
1892 buf = e+1;
1893 minor = simple_strtoul(buf, &e, 10);
1894 if (e==buf || *e != '\n')
1895 return -EINVAL;
1896 if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
1897 super_types[major].name == NULL)
1898 return -ENOENT;
1899 mddev->major_version = major;
1900 mddev->minor_version = minor;
1901 mddev->persistent = 1;
1902 return len;
1903}
1904
1905static struct md_sysfs_entry md_metadata =
1906__ATTR(metadata_version, 0644, metadata_show, metadata_store);
1907
24dd469d 1908static ssize_t
7eec314d 1909action_show(mddev_t *mddev, char *page)
24dd469d 1910{
7eec314d 1911 char *type = "idle";
31399d9e
N		 1912 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
1913 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
1914 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N		 1915 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
1916 type = "resync";
1917 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
1918 type = "check";
1919 else
1920 type = "repair";
1921 } else
1922 type = "recover";
1923 }
1924 return sprintf(page, "%s\n", type);
1925}
1926
1927static ssize_t
7eec314d 1928action_store(mddev_t *mddev, const char *page, size_t len)
24dd469d 1929{
7eec314d
N		 1930 if (!mddev->pers || !mddev->pers->sync_request)
1931 return -EINVAL;
1932
bce74dac 1933 if (cmd_match(page, "idle")) {
7eec314d
N		 1934 if (mddev->sync_thread) {
1935 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1936 md_unregister_thread(mddev->sync_thread);
1937 mddev->sync_thread = NULL;
1938 mddev->recovery = 0;
1939 }
03c902e1
N		 1940 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
1941 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 1942 return -EBUSY;
03c902e1 1943 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
7eec314d
N		 1944 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
1945 else {
bce74dac 1946 if (cmd_match(page, "check"))
7eec314d 1947 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
bce74dac 1948 else if (cmd_match(page, "repair"))
7eec314d
N		 1949 return -EINVAL;
1950 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
1951 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7eec314d 1952 }
03c902e1 1953 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d
N		 1954 md_wakeup_thread(mddev->thread);
1955 return len;
1956}
1957
9d88883e 1958static ssize_t
96de1e66 1959mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 1960{
1961 return sprintf(page, "%llu\n",
1962 (unsigned long long) mddev->resync_mismatches);
1963}
1964
96de1e66 1965static struct md_sysfs_entry
7eec314d 1966md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 1967
96de1e66
N		 1968
1969static struct md_sysfs_entry
1970md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 1971
eae1701f
N		 1972static struct attribute *md_default_attrs[] = {
1973 &md_level.attr,
1974 &md_raid_disks.attr,
3b34380a 1975 &md_chunk_size.attr,
a35b0d69 1976 &md_size.attr,
8bb93aac 1977 &md_metadata.attr,
411036fa
N		 1978 NULL,
1979};
1980
1981static struct attribute *md_redundancy_attrs[] = {
24dd469d 1982 &md_scan_mode.attr,
9d88883e 1983 &md_mismatches.attr,
eae1701f
N		 1984 NULL,
1985};
411036fa
N		 1986static struct attribute_group md_redundancy_group = {
1987 .name = NULL,
1988 .attrs = md_redundancy_attrs,
1989};
1990
eae1701f
N		 1991
1992static ssize_t
1993md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1994{
1995 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
1996 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 1997 ssize_t rv;
eae1701f
N		 1998
1999 if (!entry->show)
2000 return -EIO;
96de1e66
N		 2001 mddev_lock(mddev);
2002 rv = entry->show(mddev, page);
2003 mddev_unlock(mddev);
2004 return rv;
eae1701f
N		 2005}
2006
2007static ssize_t
2008md_attr_store(struct kobject *kobj, struct attribute *attr,
2009 const char *page, size_t length)
2010{
2011 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2012 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 2013 ssize_t rv;
eae1701f
N		 2014
2015 if (!entry->store)
2016 return -EIO;
96de1e66
N		 2017 mddev_lock(mddev);
2018 rv = entry->store(mddev, page, length);
2019 mddev_unlock(mddev);
2020 return rv;
eae1701f
N		 2021}
2022
2023static void md_free(struct kobject *ko)
2024{
2025 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2026 kfree(mddev);
2027}
2028
2029static struct sysfs_ops md_sysfs_ops = {
2030 .show = md_attr_show,
2031 .store = md_attr_store,
2032};
2033static struct kobj_type md_ktype = {
2034 .release = md_free,
2035 .sysfs_ops = &md_sysfs_ops,
2036 .default_attrs = md_default_attrs,
2037};
2038
1da177e4
LT		 2039int mdp_major = 0;
2040
2041static struct kobject *md_probe(dev_t dev, int *part, void *data)
2042{
2043 static DECLARE_MUTEX(disks_sem);
2044 mddev_t *mddev = mddev_find(dev);
2045 struct gendisk *disk;
2046 int partitioned = (MAJOR(dev) != MD_MAJOR);
2047 int shift = partitioned ? MdpMinorShift : 0;
2048 int unit = MINOR(dev) >> shift;
2049
2050 if (!mddev)
2051 return NULL;
2052
2053 down(&disks_sem);
2054 if (mddev->gendisk) {
2055 up(&disks_sem);
2056 mddev_put(mddev);
2057 return NULL;
2058 }
2059 disk = alloc_disk(1 << shift);
2060 if (!disk) {
2061 up(&disks_sem);
2062 mddev_put(mddev);
2063 return NULL;
2064 }
2065 disk->major = MAJOR(dev);
2066 disk->first_minor = unit << shift;
2067 if (partitioned) {
2068 sprintf(disk->disk_name, "md_d%d", unit);
2069 sprintf(disk->devfs_name, "md/d%d", unit);
2070 } else {
2071 sprintf(disk->disk_name, "md%d", unit);
2072 sprintf(disk->devfs_name, "md/%d", unit);
2073 }
2074 disk->fops = &md_fops;
2075 disk->private_data = mddev;
2076 disk->queue = mddev->queue;
2077 add_disk(disk);
2078 mddev->gendisk = disk;
2079 up(&disks_sem);
9c791977 2080 mddev->kobj.parent = &disk->kobj;
eae1701f
N		 2081 mddev->kobj.k_name = NULL;
2082 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
2083 mddev->kobj.ktype = &md_ktype;
2084 kobject_register(&mddev->kobj);
1da177e4
LT		 2085 return NULL;
2086}
2087
2088void md_wakeup_thread(mdk_thread_t *thread);
2089
2090static void md_safemode_timeout(unsigned long data)
2091{
2092 mddev_t *mddev = (mddev_t *) data;
2093
2094 mddev->safemode = 1;
2095 md_wakeup_thread(mddev->thread);
2096}
2097
6ff8d8ec 2098static int start_dirty_degraded;
1da177e4
LT		 2099
2100static int do_md_run(mddev_t * mddev)
2101{
2604b703 2102 int err;
1da177e4
LT		 2103 int chunk_size;
2104 struct list_head *tmp;
2105 mdk_rdev_t *rdev;
2106 struct gendisk *disk;
2604b703 2107 struct mdk_personality *pers;
1da177e4
LT		 2108 char b[BDEVNAME_SIZE];
2109
a757e64c
N		 2110 if (list_empty(&mddev->disks))
2111 /* cannot run an array with no devices.. */
1da177e4 2112 return -EINVAL;
1da177e4
LT		 2113
2114 if (mddev->pers)
2115 return -EBUSY;
2116
2117 /*
2118 * Analyze all RAID superblock(s)
2119 */
a757e64c
N		 2120 if (!mddev->raid_disks)
2121 analyze_sbs(mddev);
1da177e4
LT		 2122
2123 chunk_size = mddev->chunk_size;
2604b703
N		 2124
2125 if (chunk_size) {
1da177e4
LT		 2126 if (chunk_size > MAX_CHUNK_SIZE) {
2127 printk(KERN_ERR "too big chunk_size: %d > %d\n",
2128 chunk_size, MAX_CHUNK_SIZE);
2129 return -EINVAL;
2130 }
2131 /*
2132 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2133 */
2134 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 2135 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 2136 return -EINVAL;
2137 }
2138 if (chunk_size < PAGE_SIZE) {
2139 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
2140 chunk_size, PAGE_SIZE);
2141 return -EINVAL;
2142 }
2143
2144 /* devices must have minimum size of one chunk */
2145 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2146 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2147 continue;
2148 if (rdev->size < chunk_size / 1024) {
2149 printk(KERN_WARNING
2150 "md: Dev %s smaller than chunk_size:"
2151 " %lluk < %dk\n",
2152 bdevname(rdev->bdev,b),
2153 (unsigned long long)rdev->size,
2154 chunk_size / 1024);
2155 return -EINVAL;
2156 }
2157 }
2158 }
2159
1da177e4 2160#ifdef CONFIG_KMOD
2604b703 2161 request_module("md-level-%d", mddev->level);
1da177e4
LT		 2162#endif
2163
2164 /*
2165 * Drop all container device buffers, from now on
2166 * the only valid external interface is through the md
2167 * device.
2168 * Also find largest hardsector size
2169 */
2170 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2171 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2172 continue;
2173 sync_blockdev(rdev->bdev);
2174 invalidate_bdev(rdev->bdev, 0);
2175 }
2176
2177 md_probe(mddev->unit, NULL, NULL);
2178 disk = mddev->gendisk;
2179 if (!disk)
2180 return -ENOMEM;
2181
2182 spin_lock(&pers_lock);
2604b703
N		 2183 pers = find_pers(mddev->level);
2184 if (!pers || !try_module_get(pers->owner)) {
1da177e4 2185 spin_unlock(&pers_lock);
2604b703
N		 2186 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
2187 mddev->level);
1da177e4
LT		 2188 return -EINVAL;
2189 }
2604b703 2190 mddev->pers = pers;
1da177e4
LT		 2191 spin_unlock(&pers_lock);
2192
657390d2 2193 mddev->recovery = 0;
1da177e4 2194 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 2195 mddev->barriers_work = 1;
6ff8d8ec 2196 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 2197
f91de92e
N		 2198 if (start_readonly)
2199 mddev->ro = 2; /* read-only, but switch on first write */
2200
b15c2e57
N		 2201 err = mddev->pers->run(mddev);
2202 if (!err && mddev->pers->sync_request) {
2203 err = bitmap_create(mddev);
2204 if (err) {
2205 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
2206 mdname(mddev), err);
2207 mddev->pers->stop(mddev);
2208 }
2209 }
1da177e4
LT		 2210 if (err) {
2211 printk(KERN_ERR "md: pers->run() failed ...\n");
2212 module_put(mddev->pers->owner);
2213 mddev->pers = NULL;
32a7627c
N		 2214 bitmap_destroy(mddev);
2215 return err;
1da177e4 2216 }
411036fa
N		 2217 if (mddev->pers->sync_request)
2218 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
fd9d49ca
N		 2219 else if (mddev->ro == 2) /* auto-readonly not meaningful */
2220 mddev->ro = 0;
2221
1da177e4
LT		 2222 atomic_set(&mddev->writes_pending,0);
2223 mddev->safemode = 0;
2224 mddev->safemode_timer.function = md_safemode_timeout;
2225 mddev->safemode_timer.data = (unsigned long) mddev;
2226 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */
2227 mddev->in_sync = 1;
86e6ffdd
N		 2228
2229 ITERATE_RDEV(mddev,rdev,tmp)
2230 if (rdev->raid_disk >= 0) {
2231 char nm[20];
2232 sprintf(nm, "rd%d", rdev->raid_disk);
2233 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2234 }
1da177e4
LT		 2235
2236 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 2237 md_wakeup_thread(mddev->thread);
1da177e4
LT		 2238
2239 if (mddev->sb_dirty)
2240 md_update_sb(mddev);
2241
2242 set_capacity(disk, mddev->array_size<<1);
2243
2244 /* If we call blk_queue_make_request here, it will
2245 * re-initialise max_sectors etc which may have been
2246 * refined inside -> run. So just set the bits we need to set.
2247 * Most initialisation happended when we called
2248 * blk_queue_make_request(..., md_fail_request)
2249 * earlier.
2250 */
2251 mddev->queue->queuedata = mddev;
2252 mddev->queue->make_request_fn = mddev->pers->make_request;
2253
2254 mddev->changed = 1;
d7603b7e 2255 md_new_event(mddev);
1da177e4
LT		 2256 return 0;
2257}
2258
2259static int restart_array(mddev_t *mddev)
2260{
2261 struct gendisk *disk = mddev->gendisk;
2262 int err;
2263
2264 /*
2265 * Complain if it has no devices
2266 */
2267 err = -ENXIO;
2268 if (list_empty(&mddev->disks))
2269 goto out;
2270
2271 if (mddev->pers) {
2272 err = -EBUSY;
2273 if (!mddev->ro)
2274 goto out;
2275
2276 mddev->safemode = 0;
2277 mddev->ro = 0;
2278 set_disk_ro(disk, 0);
2279
2280 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2281 mdname(mddev));
2282 /*
2283 * Kick recovery or resync if necessary
2284 */
2285 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2286 md_wakeup_thread(mddev->thread);
2287 err = 0;
2288 } else {
2289 printk(KERN_ERR "md: %s has no personality assigned.\n",
2290 mdname(mddev));
2291 err = -EINVAL;
2292 }
2293
2294out:
2295 return err;
2296}
2297
2298static int do_md_stop(mddev_t * mddev, int ro)
2299{
2300 int err = 0;
2301 struct gendisk *disk = mddev->gendisk;
2302
2303 if (mddev->pers) {
2304 if (atomic_read(&mddev->active)>2) {
2305 printk("md: %s still in use.\n",mdname(mddev));
2306 return -EBUSY;
2307 }
2308
2309 if (mddev->sync_thread) {
2310 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2311 md_unregister_thread(mddev->sync_thread);
2312 mddev->sync_thread = NULL;
2313 }
2314
2315 del_timer_sync(&mddev->safemode_timer);
2316
2317 invalidate_partition(disk, 0);
2318
2319 if (ro) {
2320 err = -ENXIO;
f91de92e 2321 if (mddev->ro==1)
1da177e4
LT		 2322 goto out;
2323 mddev->ro = 1;
2324 } else {
6b8b3e8a 2325 bitmap_flush(mddev);
a9701a30 2326 md_super_wait(mddev);
1da177e4
LT		 2327 if (mddev->ro)
2328 set_disk_ro(disk, 0);
2329 blk_queue_make_request(mddev->queue, md_fail_request);
2330 mddev->pers->stop(mddev);
411036fa
N		 2331 if (mddev->pers->sync_request)
2332 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
2333
1da177e4
LT		 2334 module_put(mddev->pers->owner);
2335 mddev->pers = NULL;
2336 if (mddev->ro)
2337 mddev->ro = 0;
2338 }
2339 if (!mddev->in_sync) {
2340 /* mark array as shutdown cleanly */
2341 mddev->in_sync = 1;
2342 md_update_sb(mddev);
2343 }
2344 if (ro)
2345 set_disk_ro(disk, 1);
2346 }
32a7627c
N		 2347
2348 bitmap_destroy(mddev);
2349 if (mddev->bitmap_file) {
2350 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
2351 fput(mddev->bitmap_file);
2352 mddev->bitmap_file = NULL;
2353 }
9223214e 2354 mddev->bitmap_offset = 0;
32a7627c 2355
1da177e4
LT		 2356 /*
2357 * Free resources if final stop
2358 */
2359 if (!ro) {
86e6ffdd
N		 2360 mdk_rdev_t *rdev;
2361 struct list_head *tmp;
1da177e4
LT		 2362 struct gendisk *disk;
2363 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
2364
86e6ffdd
N		 2365 ITERATE_RDEV(mddev,rdev,tmp)
2366 if (rdev->raid_disk >= 0) {
2367 char nm[20];
2368 sprintf(nm, "rd%d", rdev->raid_disk);
2369 sysfs_remove_link(&mddev->kobj, nm);
2370 }
2371
1da177e4
LT		 2372 export_array(mddev);
2373
2374 mddev->array_size = 0;
2375 disk = mddev->gendisk;
2376 if (disk)
2377 set_capacity(disk, 0);
2378 mddev->changed = 1;
2379 } else
2380 printk(KERN_INFO "md: %s switched to read-only mode.\n",
2381 mdname(mddev));
2382 err = 0;
d7603b7e 2383 md_new_event(mddev);
1da177e4
LT		 2384out:
2385 return err;
2386}
2387
2388static void autorun_array(mddev_t *mddev)
2389{
2390 mdk_rdev_t *rdev;
2391 struct list_head *tmp;
2392 int err;
2393
a757e64c 2394 if (list_empty(&mddev->disks))
1da177e4 2395 return;
1da177e4
LT		 2396
2397 printk(KERN_INFO "md: running: ");
2398
2399 ITERATE_RDEV(mddev,rdev,tmp) {
2400 char b[BDEVNAME_SIZE];
2401 printk("<%s>", bdevname(rdev->bdev,b));
2402 }
2403 printk("\n");
2404
2405 err = do_md_run (mddev);
2406 if (err) {
2407 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
2408 do_md_stop (mddev, 0);
2409 }
2410}
2411
2412/*
2413 * lets try to run arrays based on all disks that have arrived
2414 * until now. (those are in pending_raid_disks)
2415 *
2416 * the method: pick the first pending disk, collect all disks with
2417 * the same UUID, remove all from the pending list and put them into
2418 * the 'same_array' list. Then order this list based on superblock
2419 * update time (freshest comes first), kick out 'old' disks and
2420 * compare superblocks. If everything's fine then run it.
2421 *
2422 * If "unit" is allocated, then bump its reference count
2423 */
2424static void autorun_devices(int part)
2425{
2426 struct list_head candidates;
2427 struct list_head *tmp;
2428 mdk_rdev_t *rdev0, *rdev;
2429 mddev_t *mddev;
2430 char b[BDEVNAME_SIZE];
2431
2432 printk(KERN_INFO "md: autorun ...\n");
2433 while (!list_empty(&pending_raid_disks)) {
2434 dev_t dev;
2435 rdev0 = list_entry(pending_raid_disks.next,
2436 mdk_rdev_t, same_set);
2437
2438 printk(KERN_INFO "md: considering %s ...\n",
2439 bdevname(rdev0->bdev,b));
2440 INIT_LIST_HEAD(&candidates);
2441 ITERATE_RDEV_PENDING(rdev,tmp)
2442 if (super_90_load(rdev, rdev0, 0) >= 0) {
2443 printk(KERN_INFO "md: adding %s ...\n",
2444 bdevname(rdev->bdev,b));
2445 list_move(&rdev->same_set, &candidates);
2446 }
2447 /*
2448 * now we have a set of devices, with all of them having
2449 * mostly sane superblocks. It's time to allocate the
2450 * mddev.
2451 */
2452 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
2453 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
2454 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
2455 break;
2456 }
2457 if (part)
2458 dev = MKDEV(mdp_major,
2459 rdev0->preferred_minor << MdpMinorShift);
2460 else
2461 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
2462
2463 md_probe(dev, NULL, NULL);
2464 mddev = mddev_find(dev);
2465 if (!mddev) {
2466 printk(KERN_ERR
2467 "md: cannot allocate memory for md drive.\n");
2468 break;
2469 }
2470 if (mddev_lock(mddev))
2471 printk(KERN_WARNING "md: %s locked, cannot run\n",
2472 mdname(mddev));
2473 else if (mddev->raid_disks || mddev->major_version
2474 || !list_empty(&mddev->disks)) {
2475 printk(KERN_WARNING
2476 "md: %s already running, cannot run %s\n",
2477 mdname(mddev), bdevname(rdev0->bdev,b));
2478 mddev_unlock(mddev);
2479 } else {
2480 printk(KERN_INFO "md: created %s\n", mdname(mddev));
2481 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
2482 list_del_init(&rdev->same_set);
2483 if (bind_rdev_to_array(rdev, mddev))
2484 export_rdev(rdev);
2485 }
2486 autorun_array(mddev);
2487 mddev_unlock(mddev);
2488 }
2489 /* on success, candidates will be empty, on error
2490 * it won't...
2491 */
2492 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
2493 export_rdev(rdev);
2494 mddev_put(mddev);
2495 }
2496 printk(KERN_INFO "md: ... autorun DONE.\n");
2497}
2498
2499/*
2500 * import RAID devices based on one partition
2501 * if possible, the array gets run as well.
2502 */
2503
2504static int autostart_array(dev_t startdev)
2505{
2506 char b[BDEVNAME_SIZE];
2507 int err = -EINVAL, i;
2508 mdp_super_t *sb = NULL;
2509 mdk_rdev_t *start_rdev = NULL, *rdev;
2510
2511 start_rdev = md_import_device(startdev, 0, 0);
2512 if (IS_ERR(start_rdev))
2513 return err;
2514
2515
2516 /* NOTE: this can only work for 0.90.0 superblocks */
2517 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
2518 if (sb->major_version != 0 ||
2519 sb->minor_version != 90 ) {
2520 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
2521 export_rdev(start_rdev);
2522 return err;
2523 }
2524
b2d444d7 2525 if (test_bit(Faulty, &start_rdev->flags)) {
1da177e4
LT		 2526 printk(KERN_WARNING
2527 "md: can not autostart based on faulty %s!\n",
2528 bdevname(start_rdev->bdev,b));
2529 export_rdev(start_rdev);
2530 return err;
2531 }
2532 list_add(&start_rdev->same_set, &pending_raid_disks);
2533
2534 for (i = 0; i < MD_SB_DISKS; i++) {
2535 mdp_disk_t *desc = sb->disks + i;
2536 dev_t dev = MKDEV(desc->major, desc->minor);
2537
2538 if (!dev)
2539 continue;
2540 if (dev == startdev)
2541 continue;
2542 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
2543 continue;
2544 rdev = md_import_device(dev, 0, 0);
2545 if (IS_ERR(rdev))
2546 continue;
2547
2548 list_add(&rdev->same_set, &pending_raid_disks);
2549 }
2550
2551 /*
2552 * possibly return codes
2553 */
2554 autorun_devices(0);
2555 return 0;
2556
2557}
2558
2559
2560static int get_version(void __user * arg)
2561{
2562 mdu_version_t ver;
2563
2564 ver.major = MD_MAJOR_VERSION;
2565 ver.minor = MD_MINOR_VERSION;
2566 ver.patchlevel = MD_PATCHLEVEL_VERSION;
2567
2568 if (copy_to_user(arg, &ver, sizeof(ver)))
2569 return -EFAULT;
2570
2571 return 0;
2572}
2573
2574static int get_array_info(mddev_t * mddev, void __user * arg)
2575{
2576 mdu_array_info_t info;
2577 int nr,working,active,failed,spare;
2578 mdk_rdev_t *rdev;
2579 struct list_head *tmp;
2580
2581 nr=working=active=failed=spare=0;
2582 ITERATE_RDEV(mddev,rdev,tmp) {
2583 nr++;
b2d444d7 2584 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2585 failed++;
2586 else {
2587 working++;
b2d444d7 2588 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 2589 active++;
2590 else
2591 spare++;
2592 }
2593 }
2594
2595 info.major_version = mddev->major_version;
2596 info.minor_version = mddev->minor_version;
2597 info.patch_version = MD_PATCHLEVEL_VERSION;
2598 info.ctime = mddev->ctime;
2599 info.level = mddev->level;
2600 info.size = mddev->size;
2601 info.nr_disks = nr;
2602 info.raid_disks = mddev->raid_disks;
2603 info.md_minor = mddev->md_minor;
2604 info.not_persistent= !mddev->persistent;
2605
2606 info.utime = mddev->utime;
2607 info.state = 0;
2608 if (mddev->in_sync)
2609 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 2610 if (mddev->bitmap && mddev->bitmap_offset)
2611 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 2612 info.active_disks = active;
2613 info.working_disks = working;
2614 info.failed_disks = failed;
2615 info.spare_disks = spare;
2616
2617 info.layout = mddev->layout;
2618 info.chunk_size = mddev->chunk_size;
2619
2620 if (copy_to_user(arg, &info, sizeof(info)))
2621 return -EFAULT;
2622
2623 return 0;
2624}
2625
87162a28 2626static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 2627{
2628 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
2629 char *ptr, *buf = NULL;
2630 int err = -ENOMEM;
2631
2632 file = kmalloc(sizeof(*file), GFP_KERNEL);
2633 if (!file)
2634 goto out;
2635
2636 /* bitmap disabled, zero the first byte and copy out */
2637 if (!mddev->bitmap || !mddev->bitmap->file) {
2638 file->pathname[0] = '\0';
2639 goto copy_out;
2640 }
2641
2642 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
2643 if (!buf)
2644 goto out;
2645
2646 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
2647 if (!ptr)
2648 goto out;
2649
2650 strcpy(file->pathname, ptr);
2651
2652copy_out:
2653 err = 0;
2654 if (copy_to_user(arg, file, sizeof(*file)))
2655 err = -EFAULT;
2656out:
2657 kfree(buf);
2658 kfree(file);
2659 return err;
2660}
2661
1da177e4
LT		 2662static int get_disk_info(mddev_t * mddev, void __user * arg)
2663{
2664 mdu_disk_info_t info;
2665 unsigned int nr;
2666 mdk_rdev_t *rdev;
2667
2668 if (copy_from_user(&info, arg, sizeof(info)))
2669 return -EFAULT;
2670
2671 nr = info.number;
2672
2673 rdev = find_rdev_nr(mddev, nr);
2674 if (rdev) {
2675 info.major = MAJOR(rdev->bdev->bd_dev);
2676 info.minor = MINOR(rdev->bdev->bd_dev);
2677 info.raid_disk = rdev->raid_disk;
2678 info.state = 0;
b2d444d7 2679 if (test_bit(Faulty, &rdev->flags))
1da177e4 2680 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 2681 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 2682 info.state |= (1<<MD_DISK_ACTIVE);
2683 info.state |= (1<<MD_DISK_SYNC);
2684 }
8ddf9efe
N		 2685 if (test_bit(WriteMostly, &rdev->flags))
2686 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 2687 } else {
2688 info.major = info.minor = 0;
2689 info.raid_disk = -1;
2690 info.state = (1<<MD_DISK_REMOVED);
2691 }
2692
2693 if (copy_to_user(arg, &info, sizeof(info)))
2694 return -EFAULT;
2695
2696 return 0;
2697}
2698
2699static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
2700{
2701 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
2702 mdk_rdev_t *rdev;
2703 dev_t dev = MKDEV(info->major,info->minor);
2704
2705 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
2706 return -EOVERFLOW;
2707
2708 if (!mddev->raid_disks) {
2709 int err;
2710 /* expecting a device which has a superblock */
2711 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
2712 if (IS_ERR(rdev)) {
2713 printk(KERN_WARNING
2714 "md: md_import_device returned %ld\n",
2715 PTR_ERR(rdev));
2716 return PTR_ERR(rdev);
2717 }
2718 if (!list_empty(&mddev->disks)) {
2719 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2720 mdk_rdev_t, same_set);
2721 int err = super_types[mddev->major_version]
2722 .load_super(rdev, rdev0, mddev->minor_version);
2723 if (err < 0) {
2724 printk(KERN_WARNING
2725 "md: %s has different UUID to %s\n",
2726 bdevname(rdev->bdev,b),
2727 bdevname(rdev0->bdev,b2));
2728 export_rdev(rdev);
2729 return -EINVAL;
2730 }
2731 }
2732 err = bind_rdev_to_array(rdev, mddev);
2733 if (err)
2734 export_rdev(rdev);
2735 return err;
2736 }
2737
2738 /*
2739 * add_new_disk can be used once the array is assembled
2740 * to add "hot spares". They must already have a superblock
2741 * written
2742 */
2743 if (mddev->pers) {
2744 int err;
2745 if (!mddev->pers->hot_add_disk) {
2746 printk(KERN_WARNING
2747 "%s: personality does not support diskops!\n",
2748 mdname(mddev));
2749 return -EINVAL;
2750 }
7b1e35f6
N		 2751 if (mddev->persistent)
2752 rdev = md_import_device(dev, mddev->major_version,
2753 mddev->minor_version);
2754 else
2755 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 2756 if (IS_ERR(rdev)) {
2757 printk(KERN_WARNING
2758 "md: md_import_device returned %ld\n",
2759 PTR_ERR(rdev));
2760 return PTR_ERR(rdev);
2761 }
41158c7e
N		 2762 /* set save_raid_disk if appropriate */
2763 if (!mddev->persistent) {
2764 if (info->state & (1<<MD_DISK_SYNC) &&
2765 info->raid_disk < mddev->raid_disks)
2766 rdev->raid_disk = info->raid_disk;
2767 else
2768 rdev->raid_disk = -1;
2769 } else
2770 super_types[mddev->major_version].
2771 validate_super(mddev, rdev);
2772 rdev->saved_raid_disk = rdev->raid_disk;
2773
b2d444d7 2774 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 2775 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
2776 set_bit(WriteMostly, &rdev->flags);
2777
1da177e4
LT		 2778 rdev->raid_disk = -1;
2779 err = bind_rdev_to_array(rdev, mddev);
2780 if (err)
2781 export_rdev(rdev);
c361777f
N		 2782
2783 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 2784 md_wakeup_thread(mddev->thread);
1da177e4
LT		 2785 return err;
2786 }
2787
2788 /* otherwise, add_new_disk is only allowed
2789 * for major_version==0 superblocks
2790 */
2791 if (mddev->major_version != 0) {
2792 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
2793 mdname(mddev));
2794 return -EINVAL;
2795 }
2796
2797 if (!(info->state & (1<<MD_DISK_FAULTY))) {
2798 int err;
2799 rdev = md_import_device (dev, -1, 0);
2800 if (IS_ERR(rdev)) {
2801 printk(KERN_WARNING
2802 "md: error, md_import_device() returned %ld\n",
2803 PTR_ERR(rdev));
2804 return PTR_ERR(rdev);
2805 }
2806 rdev->desc_nr = info->number;
2807 if (info->raid_disk < mddev->raid_disks)
2808 rdev->raid_disk = info->raid_disk;
2809 else
2810 rdev->raid_disk = -1;
2811
b2d444d7
N		 2812 rdev->flags = 0;
2813
1da177e4 2814 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 2815 if (info->state & (1<<MD_DISK_SYNC))
2816 set_bit(In_sync, &rdev->flags);
1da177e4 2817
8ddf9efe
N		 2818 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
2819 set_bit(WriteMostly, &rdev->flags);
2820
1da177e4
LT		 2821 err = bind_rdev_to_array(rdev, mddev);
2822 if (err) {
2823 export_rdev(rdev);
2824 return err;
2825 }
2826
2827 if (!mddev->persistent) {
2828 printk(KERN_INFO "md: nonpersistent superblock ...\n");
2829 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2830 } else
2831 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
2832 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
2833
2834 if (!mddev->size || (mddev->size > rdev->size))
2835 mddev->size = rdev->size;
2836 }
2837
2838 return 0;
2839}
2840
2841static int hot_remove_disk(mddev_t * mddev, dev_t dev)
2842{
2843 char b[BDEVNAME_SIZE];
2844 mdk_rdev_t *rdev;
2845
2846 if (!mddev->pers)
2847 return -ENODEV;
2848
2849 rdev = find_rdev(mddev, dev);
2850 if (!rdev)
2851 return -ENXIO;
2852
2853 if (rdev->raid_disk >= 0)
2854 goto busy;
2855
2856 kick_rdev_from_array(rdev);
2857 md_update_sb(mddev);
d7603b7e 2858 md_new_event(mddev);
1da177e4
LT		 2859
2860 return 0;
2861busy:
2862 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
2863 bdevname(rdev->bdev,b), mdname(mddev));
2864 return -EBUSY;
2865}
2866
2867static int hot_add_disk(mddev_t * mddev, dev_t dev)
2868{
2869 char b[BDEVNAME_SIZE];
2870 int err;
2871 unsigned int size;
2872 mdk_rdev_t *rdev;
2873
2874 if (!mddev->pers)
2875 return -ENODEV;
2876
2877 if (mddev->major_version != 0) {
2878 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
2879 " version-0 superblocks.\n",
2880 mdname(mddev));
2881 return -EINVAL;
2882 }
2883 if (!mddev->pers->hot_add_disk) {
2884 printk(KERN_WARNING
2885 "%s: personality does not support diskops!\n",
2886 mdname(mddev));
2887 return -EINVAL;
2888 }
2889
2890 rdev = md_import_device (dev, -1, 0);
2891 if (IS_ERR(rdev)) {
2892 printk(KERN_WARNING
2893 "md: error, md_import_device() returned %ld\n",
2894 PTR_ERR(rdev));
2895 return -EINVAL;
2896 }
2897
2898 if (mddev->persistent)
2899 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
2900 else
2901 rdev->sb_offset =
2902 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2903
2904 size = calc_dev_size(rdev, mddev->chunk_size);
2905 rdev->size = size;
2906
2907 if (size < mddev->size) {
2908 printk(KERN_WARNING
2909 "%s: disk size %llu blocks < array size %llu\n",
2910 mdname(mddev), (unsigned long long)size,
2911 (unsigned long long)mddev->size);
2912 err = -ENOSPC;
2913 goto abort_export;
2914 }
2915
b2d444d7 2916 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 2917 printk(KERN_WARNING
2918 "md: can not hot-add faulty %s disk to %s!\n",
2919 bdevname(rdev->bdev,b), mdname(mddev));
2920 err = -EINVAL;
2921 goto abort_export;
2922 }
b2d444d7 2923 clear_bit(In_sync, &rdev->flags);
1da177e4
LT		 2924 rdev->desc_nr = -1;
2925 bind_rdev_to_array(rdev, mddev);
2926
2927 /*
2928 * The rest should better be atomic, we can have disk failures
2929 * noticed in interrupt contexts ...
2930 */
2931
2932 if (rdev->desc_nr == mddev->max_disks) {
2933 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
2934 mdname(mddev));
2935 err = -EBUSY;
2936 goto abort_unbind_export;
2937 }
2938
2939 rdev->raid_disk = -1;
2940
2941 md_update_sb(mddev);
2942
2943 /*
2944 * Kick recovery, maybe this spare has to be added to the
2945 * array immediately.
2946 */
2947 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2948 md_wakeup_thread(mddev->thread);
d7603b7e 2949 md_new_event(mddev);
1da177e4
LT		 2950 return 0;
2951
2952abort_unbind_export:
2953 unbind_rdev_from_array(rdev);
2954
2955abort_export:
2956 export_rdev(rdev);
2957 return err;
2958}
2959
32a7627c
N		 2960/* similar to deny_write_access, but accounts for our holding a reference
2961 * to the file ourselves */
2962static int deny_bitmap_write_access(struct file * file)
2963{
2964 struct inode *inode = file->f_mapping->host;
2965
2966 spin_lock(&inode->i_lock);
2967 if (atomic_read(&inode->i_writecount) > 1) {
2968 spin_unlock(&inode->i_lock);
2969 return -ETXTBSY;
2970 }
2971 atomic_set(&inode->i_writecount, -1);
2972 spin_unlock(&inode->i_lock);
2973
2974 return 0;
2975}
2976
2977static int set_bitmap_file(mddev_t *mddev, int fd)
2978{
2979 int err;
2980
36fa3063
N		 2981 if (mddev->pers) {
2982 if (!mddev->pers->quiesce)
2983 return -EBUSY;
2984 if (mddev->recovery || mddev->sync_thread)
2985 return -EBUSY;
2986 /* we should be able to change the bitmap.. */
2987 }
32a7627c 2988
32a7627c 2989
36fa3063
N		 2990 if (fd >= 0) {
2991 if (mddev->bitmap)
2992 return -EEXIST; /* cannot add when bitmap is present */
2993 mddev->bitmap_file = fget(fd);
32a7627c 2994
36fa3063
N		 2995 if (mddev->bitmap_file == NULL) {
2996 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
2997 mdname(mddev));
2998 return -EBADF;
2999 }
3000
3001 err = deny_bitmap_write_access(mddev->bitmap_file);
3002 if (err) {
3003 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
3004 mdname(mddev));
3005 fput(mddev->bitmap_file);
3006 mddev->bitmap_file = NULL;
3007 return err;
3008 }
a654b9d8 3009 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 3010 } else if (mddev->bitmap == NULL)
3011 return -ENOENT; /* cannot remove what isn't there */
3012 err = 0;
3013 if (mddev->pers) {
3014 mddev->pers->quiesce(mddev, 1);
3015 if (fd >= 0)
3016 err = bitmap_create(mddev);
3017 if (fd < 0 || err)
3018 bitmap_destroy(mddev);
3019 mddev->pers->quiesce(mddev, 0);
3020 } else if (fd < 0) {
3021 if (mddev->bitmap_file)
3022 fput(mddev->bitmap_file);
3023 mddev->bitmap_file = NULL;
3024 }
3025
32a7627c
N		 3026 return err;
3027}
3028
1da177e4
LT		 3029/*
3030 * set_array_info is used two different ways
3031 * The original usage is when creating a new array.
3032 * In this usage, raid_disks is > 0 and it together with
3033 * level, size, not_persistent,layout,chunksize determine the
3034 * shape of the array.
3035 * This will always create an array with a type-0.90.0 superblock.
3036 * The newer usage is when assembling an array.
3037 * In this case raid_disks will be 0, and the major_version field is
3038 * use to determine which style super-blocks are to be found on the devices.
3039 * The minor and patch _version numbers are also kept incase the
3040 * super_block handler wishes to interpret them.
3041 */
3042static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
3043{
3044
3045 if (info->raid_disks == 0) {
3046 /* just setting version number for superblock loading */
3047 if (info->major_version < 0 ||
3048 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
3049 super_types[info->major_version].name == NULL) {
3050 /* maybe try to auto-load a module? */
3051 printk(KERN_INFO
3052 "md: superblock version %d not known\n",
3053 info->major_version);
3054 return -EINVAL;
3055 }
3056 mddev->major_version = info->major_version;
3057 mddev->minor_version = info->minor_version;
3058 mddev->patch_version = info->patch_version;
3059 return 0;
3060 }
3061 mddev->major_version = MD_MAJOR_VERSION;
3062 mddev->minor_version = MD_MINOR_VERSION;
3063 mddev->patch_version = MD_PATCHLEVEL_VERSION;
3064 mddev->ctime = get_seconds();
3065
3066 mddev->level = info->level;
3067 mddev->size = info->size;
3068 mddev->raid_disks = info->raid_disks;
3069 /* don't set md_minor, it is determined by which /dev/md* was
3070 * openned
3071 */
3072 if (info->state & (1<<MD_SB_CLEAN))
3073 mddev->recovery_cp = MaxSector;
3074 else
3075 mddev->recovery_cp = 0;
3076 mddev->persistent = ! info->not_persistent;
3077
3078 mddev->layout = info->layout;
3079 mddev->chunk_size = info->chunk_size;
3080
3081 mddev->max_disks = MD_SB_DISKS;
3082
3083 mddev->sb_dirty = 1;
3084
b2a2703c
N		 3085 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
3086 mddev->bitmap_offset = 0;
3087
1da177e4
LT		 3088 /*
3089 * Generate a 128 bit UUID
3090 */
3091 get_random_bytes(mddev->uuid, 16);
3092
3093 return 0;
3094}
3095
a35b0d69
N		 3096static int update_size(mddev_t *mddev, unsigned long size)
3097{
3098 mdk_rdev_t * rdev;
3099 int rv;
3100 struct list_head *tmp;
3101
3102 if (mddev->pers->resize == NULL)
3103 return -EINVAL;
3104 /* The "size" is the amount of each device that is used.
3105 * This can only make sense for arrays with redundancy.
3106 * linear and raid0 always use whatever space is available
3107 * We can only consider changing the size if no resync
3108 * or reconstruction is happening, and if the new size
3109 * is acceptable. It must fit before the sb_offset or,
3110 * if that is <data_offset, it must fit before the
3111 * size of each device.
3112 * If size is zero, we find the largest size that fits.
3113 */
3114 if (mddev->sync_thread)
3115 return -EBUSY;
3116 ITERATE_RDEV(mddev,rdev,tmp) {
3117 sector_t avail;
3118 int fit = (size == 0);
3119 if (rdev->sb_offset > rdev->data_offset)
3120 avail = (rdev->sb_offset*2) - rdev->data_offset;
3121 else
3122 avail = get_capacity(rdev->bdev->bd_disk)
3123 - rdev->data_offset;
3124 if (fit && (size == 0 || size > avail/2))
3125 size = avail/2;
3126 if (avail < ((sector_t)size << 1))
3127 return -ENOSPC;
3128 }
3129 rv = mddev->pers->resize(mddev, (sector_t)size *2);
3130 if (!rv) {
3131 struct block_device *bdev;
3132
3133 bdev = bdget_disk(mddev->gendisk, 0);
3134 if (bdev) {
3135 down(&bdev->bd_inode->i_sem);
3136 i_size_write(bdev->bd_inode, mddev->array_size << 10);
3137 up(&bdev->bd_inode->i_sem);
3138 bdput(bdev);
3139 }
3140 }
3141 return rv;
3142}
3143
1da177e4
LT		 3144/*
3145 * update_array_info is used to change the configuration of an
3146 * on-line array.
3147 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
3148 * fields in the info are checked against the array.
3149 * Any differences that cannot be handled will cause an error.
3150 * Normally, only one change can be managed at a time.
3151 */
3152static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
3153{
3154 int rv = 0;
3155 int cnt = 0;
36fa3063
N		 3156 int state = 0;
3157
3158 /* calculate expected state,ignoring low bits */
3159 if (mddev->bitmap && mddev->bitmap_offset)
3160 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 3161
3162 if (mddev->major_version != info->major_version ||
3163 mddev->minor_version != info->minor_version ||
3164/* mddev->patch_version != info->patch_version || */
3165 mddev->ctime != info->ctime ||
3166 mddev->level != info->level ||
3167/* mddev->layout != info->layout || */
3168 !mddev->persistent != info->not_persistent||
36fa3063
N		 3169 mddev->chunk_size != info->chunk_size ||
3170 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
3171 ((state^info->state) & 0xfffffe00)
3172 )
1da177e4
LT		 3173 return -EINVAL;
3174 /* Check there is only one change */
3175 if (mddev->size != info->size) cnt++;
3176 if (mddev->raid_disks != info->raid_disks) cnt++;
3177 if (mddev->layout != info->layout) cnt++;
36fa3063 3178 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 3179 if (cnt == 0) return 0;
3180 if (cnt > 1) return -EINVAL;
3181
3182 if (mddev->layout != info->layout) {
3183 /* Change layout
3184 * we don't need to do anything at the md level, the
3185 * personality will take care of it all.
3186 */
3187 if (mddev->pers->reconfig == NULL)
3188 return -EINVAL;
3189 else
3190 return mddev->pers->reconfig(mddev, info->layout, -1);
3191 }
a35b0d69
N		 3192 if (mddev->size != info->size)
3193 rv = update_size(mddev, info->size);
3194
1da177e4
LT		 3195 if (mddev->raid_disks != info->raid_disks) {
3196 /* change the number of raid disks */
3197 if (mddev->pers->reshape == NULL)
3198 return -EINVAL;
3199 if (info->raid_disks <= 0 ||
3200 info->raid_disks >= mddev->max_disks)
3201 return -EINVAL;
3202 if (mddev->sync_thread)
3203 return -EBUSY;
3204 rv = mddev->pers->reshape(mddev, info->raid_disks);
3205 if (!rv) {
3206 struct block_device *bdev;
3207
3208 bdev = bdget_disk(mddev->gendisk, 0);
3209 if (bdev) {
3210 down(&bdev->bd_inode->i_sem);
3211 i_size_write(bdev->bd_inode, mddev->array_size << 10);
3212 up(&bdev->bd_inode->i_sem);
3213 bdput(bdev);
3214 }
3215 }
3216 }
36fa3063
N		 3217 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
3218 if (mddev->pers->quiesce == NULL)
3219 return -EINVAL;
3220 if (mddev->recovery || mddev->sync_thread)
3221 return -EBUSY;
3222 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
3223 /* add the bitmap */
3224 if (mddev->bitmap)
3225 return -EEXIST;
3226 if (mddev->default_bitmap_offset == 0)
3227 return -EINVAL;
3228 mddev->bitmap_offset = mddev->default_bitmap_offset;
3229 mddev->pers->quiesce(mddev, 1);
3230 rv = bitmap_create(mddev);
3231 if (rv)
3232 bitmap_destroy(mddev);
3233 mddev->pers->quiesce(mddev, 0);
3234 } else {
3235 /* remove the bitmap */
3236 if (!mddev->bitmap)
3237 return -ENOENT;
3238 if (mddev->bitmap->file)
3239 return -EINVAL;
3240 mddev->pers->quiesce(mddev, 1);
3241 bitmap_destroy(mddev);
3242 mddev->pers->quiesce(mddev, 0);
3243 mddev->bitmap_offset = 0;
3244 }
3245 }
1da177e4
LT		 3246 md_update_sb(mddev);
3247 return rv;
3248}
3249
3250static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3251{
3252 mdk_rdev_t *rdev;
3253
3254 if (mddev->pers == NULL)
3255 return -ENODEV;
3256
3257 rdev = find_rdev(mddev, dev);
3258 if (!rdev)
3259 return -ENODEV;
3260
3261 md_error(mddev, rdev);
3262 return 0;
3263}
3264
3265static int md_ioctl(struct inode *inode, struct file *file,
3266 unsigned int cmd, unsigned long arg)
3267{
3268 int err = 0;
3269 void __user *argp = (void __user *)arg;
3270 struct hd_geometry __user *loc = argp;
3271 mddev_t *mddev = NULL;
3272
3273 if (!capable(CAP_SYS_ADMIN))
3274 return -EACCES;
3275
3276 /*
3277 * Commands dealing with the RAID driver but not any
3278 * particular array:
3279 */
3280 switch (cmd)
3281 {
3282 case RAID_VERSION:
3283 err = get_version(argp);
3284 goto done;
3285
3286 case PRINT_RAID_DEBUG:
3287 err = 0;
3288 md_print_devices();
3289 goto done;
3290
3291#ifndef MODULE
3292 case RAID_AUTORUN:
3293 err = 0;
3294 autostart_arrays(arg);
3295 goto done;
3296#endif
3297 default:;
3298 }
3299
3300 /*
3301 * Commands creating/starting a new array:
3302 */
3303
3304 mddev = inode->i_bdev->bd_disk->private_data;
3305
3306 if (!mddev) {
3307 BUG();
3308 goto abort;
3309 }
3310
3311
3312 if (cmd == START_ARRAY) {
3313 /* START_ARRAY doesn't need to lock the array as autostart_array
3314 * does the locking, and it could even be a different array
3315 */
3316 static int cnt = 3;
3317 if (cnt > 0 ) {
3318 printk(KERN_WARNING
3319 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
e8a00334 3320 "This will not be supported beyond July 2006\n",
1da177e4
LT		 3321 current->comm, current->pid);
3322 cnt--;
3323 }
3324 err = autostart_array(new_decode_dev(arg));
3325 if (err) {
3326 printk(KERN_WARNING "md: autostart failed!\n");
3327 goto abort;
3328 }
3329 goto done;
3330 }
3331
3332 err = mddev_lock(mddev);
3333 if (err) {
3334 printk(KERN_INFO
3335 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3336 err, cmd);
3337 goto abort;
3338 }
3339
3340 switch (cmd)
3341 {
3342 case SET_ARRAY_INFO:
3343 {
3344 mdu_array_info_t info;
3345 if (!arg)
3346 memset(&info, 0, sizeof(info));
3347 else if (copy_from_user(&info, argp, sizeof(info))) {
3348 err = -EFAULT;
3349 goto abort_unlock;
3350 }
3351 if (mddev->pers) {
3352 err = update_array_info(mddev, &info);
3353 if (err) {
3354 printk(KERN_WARNING "md: couldn't update"
3355 " array info. %d\n", err);
3356 goto abort_unlock;
3357 }
3358 goto done_unlock;
3359 }
3360 if (!list_empty(&mddev->disks)) {
3361 printk(KERN_WARNING
3362 "md: array %s already has disks!\n",
3363 mdname(mddev));
3364 err = -EBUSY;
3365 goto abort_unlock;
3366 }
3367 if (mddev->raid_disks) {
3368 printk(KERN_WARNING
3369 "md: array %s already initialised!\n",
3370 mdname(mddev));
3371 err = -EBUSY;
3372 goto abort_unlock;
3373 }
3374 err = set_array_info(mddev, &info);
3375 if (err) {
3376 printk(KERN_WARNING "md: couldn't set"
3377 " array info. %d\n", err);
3378 goto abort_unlock;
3379 }
3380 }
3381 goto done_unlock;
3382
3383 default:;
3384 }
3385
3386 /*
3387 * Commands querying/configuring an existing array:
3388 */
32a7627c
N		 3389 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3390 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3391 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3392 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
1da177e4
LT		 3393 err = -ENODEV;
3394 goto abort_unlock;
3395 }
3396
3397 /*
3398 * Commands even a read-only array can execute:
3399 */
3400 switch (cmd)
3401 {
3402 case GET_ARRAY_INFO:
3403 err = get_array_info(mddev, argp);
3404 goto done_unlock;
3405
32a7627c 3406 case GET_BITMAP_FILE:
87162a28 3407 err = get_bitmap_file(mddev, argp);
32a7627c
N		 3408 goto done_unlock;
3409
1da177e4
LT		 3410 case GET_DISK_INFO:
3411 err = get_disk_info(mddev, argp);
3412 goto done_unlock;
3413
3414 case RESTART_ARRAY_RW:
3415 err = restart_array(mddev);
3416 goto done_unlock;
3417
3418 case STOP_ARRAY:
3419 err = do_md_stop (mddev, 0);
3420 goto done_unlock;
3421
3422 case STOP_ARRAY_RO:
3423 err = do_md_stop (mddev, 1);
3424 goto done_unlock;
3425
3426 /*
3427 * We have a problem here : there is no easy way to give a CHS
3428 * virtual geometry. We currently pretend that we have a 2 heads
3429 * 4 sectors (with a BIG number of cylinders...). This drives
3430 * dosfs just mad... ;-)
3431 */
3432 case HDIO_GETGEO:
3433 if (!loc) {
3434 err = -EINVAL;
3435 goto abort_unlock;
3436 }
3437 err = put_user (2, (char __user *) &loc->heads);
3438 if (err)
3439 goto abort_unlock;
3440 err = put_user (4, (char __user *) &loc->sectors);
3441 if (err)
3442 goto abort_unlock;
3443 err = put_user(get_capacity(mddev->gendisk)/8,
3444 (short __user *) &loc->cylinders);
3445 if (err)
3446 goto abort_unlock;
3447 err = put_user (get_start_sect(inode->i_bdev),
3448 (long __user *) &loc->start);
3449 goto done_unlock;
3450 }
3451
3452 /*
3453 * The remaining ioctls are changing the state of the
f91de92e
N		 3454 * superblock, so we do not allow them on read-only arrays.
3455 * However non-MD ioctls (e.g. get-size) will still come through
3456 * here and hit the 'default' below, so only disallow
3457 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 3458 */
f91de92e
N		 3459 if (_IOC_TYPE(cmd) == MD_MAJOR &&
3460 mddev->ro && mddev->pers) {
3461 if (mddev->ro == 2) {
3462 mddev->ro = 0;
3463 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3464 md_wakeup_thread(mddev->thread);
3465
3466 } else {
3467 err = -EROFS;
3468 goto abort_unlock;
3469 }
1da177e4
LT		 3470 }
3471
3472 switch (cmd)
3473 {
3474 case ADD_NEW_DISK:
3475 {
3476 mdu_disk_info_t info;
3477 if (copy_from_user(&info, argp, sizeof(info)))
3478 err = -EFAULT;
3479 else
3480 err = add_new_disk(mddev, &info);
3481 goto done_unlock;
3482 }
3483
3484 case HOT_REMOVE_DISK:
3485 err = hot_remove_disk(mddev, new_decode_dev(arg));
3486 goto done_unlock;
3487
3488 case HOT_ADD_DISK:
3489 err = hot_add_disk(mddev, new_decode_dev(arg));
3490 goto done_unlock;
3491
3492 case SET_DISK_FAULTY:
3493 err = set_disk_faulty(mddev, new_decode_dev(arg));
3494 goto done_unlock;
3495
3496 case RUN_ARRAY:
3497 err = do_md_run (mddev);
3498 goto done_unlock;
3499
32a7627c
N		 3500 case SET_BITMAP_FILE:
3501 err = set_bitmap_file(mddev, (int)arg);
3502 goto done_unlock;
3503
1da177e4
LT		 3504 default:
3505 if (_IOC_TYPE(cmd) == MD_MAJOR)
3506 printk(KERN_WARNING "md: %s(pid %d) used"
3507 " obsolete MD ioctl, upgrade your"
3508 " software to use new ictls.\n",
3509 current->comm, current->pid);
3510 err = -EINVAL;
3511 goto abort_unlock;
3512 }
3513
3514done_unlock:
3515abort_unlock:
3516 mddev_unlock(mddev);
3517
3518 return err;
3519done:
3520 if (err)
3521 MD_BUG();
3522abort:
3523 return err;
3524}
3525
3526static int md_open(struct inode *inode, struct file *file)
3527{
3528 /*
3529 * Succeed if we can lock the mddev, which confirms that
3530 * it isn't being stopped right now.
3531 */
3532 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3533 int err;
3534
3535 if ((err = mddev_lock(mddev)))
3536 goto out;
3537
3538 err = 0;
3539 mddev_get(mddev);
3540 mddev_unlock(mddev);
3541
3542 check_disk_change(inode->i_bdev);
3543 out:
3544 return err;
3545}
3546
3547static int md_release(struct inode *inode, struct file * file)
3548{
3549 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3550
3551 if (!mddev)
3552 BUG();
3553 mddev_put(mddev);
3554
3555 return 0;
3556}
3557
3558static int md_media_changed(struct gendisk *disk)
3559{
3560 mddev_t *mddev = disk->private_data;
3561
3562 return mddev->changed;
3563}
3564
3565static int md_revalidate(struct gendisk *disk)
3566{
3567 mddev_t *mddev = disk->private_data;
3568
3569 mddev->changed = 0;
3570 return 0;
3571}
3572static struct block_device_operations md_fops =
3573{
3574 .owner = THIS_MODULE,
3575 .open = md_open,
3576 .release = md_release,
3577 .ioctl = md_ioctl,
3578 .media_changed = md_media_changed,
3579 .revalidate_disk= md_revalidate,
3580};
3581
75c96f85 3582static int md_thread(void * arg)
1da177e4
LT		 3583{
3584 mdk_thread_t *thread = arg;
3585
1da177e4
LT		 3586 /*
3587 * md_thread is a 'system-thread', it's priority should be very
3588 * high. We avoid resource deadlocks individually in each
3589 * raid personality. (RAID5 does preallocation) We also use RR and
3590 * the very same RT priority as kswapd, thus we will never get
3591 * into a priority inversion deadlock.
3592 *
3593 * we definitely have to have equal or higher priority than
3594 * bdflush, otherwise bdflush will deadlock if there are too
3595 * many dirty RAID5 blocks.
3596 */
1da177e4 3597
6985c43f 3598 allow_signal(SIGKILL);
a6fb0934 3599 while (!kthread_should_stop()) {
1da177e4 3600
93588e22
N		 3601 /* We need to wait INTERRUPTIBLE so that
3602 * we don't add to the load-average.
3603 * That means we need to be sure no signals are
3604 * pending
3605 */
3606 if (signal_pending(current))
3607 flush_signals(current);
3608
3609 wait_event_interruptible_timeout
3610 (thread->wqueue,
3611 test_bit(THREAD_WAKEUP, &thread->flags)
3612 || kthread_should_stop(),
3613 thread->timeout);
3e1d1d28 3614 try_to_freeze();
1da177e4
LT		 3615
3616 clear_bit(THREAD_WAKEUP, &thread->flags);
3617
787453c2 3618 thread->run(thread->mddev);
1da177e4 3619 }
a6fb0934 3620
1da177e4
LT		 3621 return 0;
3622}
3623
3624void md_wakeup_thread(mdk_thread_t *thread)
3625{
3626 if (thread) {
3627 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
3628 set_bit(THREAD_WAKEUP, &thread->flags);
3629 wake_up(&thread->wqueue);
3630 }
3631}
3632
3633mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
3634 const char *name)
3635{
3636 mdk_thread_t *thread;
1da177e4 3637
9ffae0cf 3638 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 3639 if (!thread)
3640 return NULL;
3641
1da177e4
LT		 3642 init_waitqueue_head(&thread->wqueue);
3643
1da177e4
LT		 3644 thread->run = run;
3645 thread->mddev = mddev;
32a7627c 3646 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 3647 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 3648 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 3649 kfree(thread);
3650 return NULL;
3651 }
1da177e4
LT		 3652 return thread;
3653}
3654
1da177e4
LT		 3655void md_unregister_thread(mdk_thread_t *thread)
3656{
d28446fe 3657 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
a6fb0934
N		 3658
3659 kthread_stop(thread->tsk);
1da177e4
LT		 3660 kfree(thread);
3661}
3662
3663void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
3664{
3665 if (!mddev) {
3666 MD_BUG();
3667 return;
3668 }
3669
b2d444d7 3670 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 3671 return;
32a7627c 3672/*
1da177e4
LT		 3673 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
3674 mdname(mddev),
3675 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
3676 __builtin_return_address(0),__builtin_return_address(1),
3677 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 3678*/
1da177e4
LT		 3679 if (!mddev->pers->error_handler)
3680 return;
3681 mddev->pers->error_handler(mddev,rdev);
3682 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3683 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3684 md_wakeup_thread(mddev->thread);
d7603b7e 3685 md_new_event(mddev);
1da177e4
LT		 3686}
3687
3688/* seq_file implementation /proc/mdstat */
3689
3690static void status_unused(struct seq_file *seq)
3691{
3692 int i = 0;
3693 mdk_rdev_t *rdev;
3694 struct list_head *tmp;
3695
3696 seq_printf(seq, "unused devices: ");
3697
3698 ITERATE_RDEV_PENDING(rdev,tmp) {
3699 char b[BDEVNAME_SIZE];
3700 i++;
3701 seq_printf(seq, "%s ",
3702 bdevname(rdev->bdev,b));
3703 }
3704 if (!i)
3705 seq_printf(seq, "<none>");
3706
3707 seq_printf(seq, "\n");
3708}
3709
3710
3711static void status_resync(struct seq_file *seq, mddev_t * mddev)
3712{
3713 unsigned long max_blocks, resync, res, dt, db, rt;
3714
3715 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
3716
3717 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3718 max_blocks = mddev->resync_max_sectors >> 1;
3719 else
3720 max_blocks = mddev->size;
3721
3722 /*
3723 * Should not happen.
3724 */
3725 if (!max_blocks) {
3726 MD_BUG();
3727 return;
3728 }
3729 res = (resync/1024)*1000/(max_blocks/1024 + 1);
3730 {
3731 int i, x = res/50, y = 20-x;
3732 seq_printf(seq, "[");
3733 for (i = 0; i < x; i++)
3734 seq_printf(seq, "=");
3735 seq_printf(seq, ">");
3736 for (i = 0; i < y; i++)
3737 seq_printf(seq, ".");
3738 seq_printf(seq, "] ");
3739 }
3740 seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)",
3741 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
3742 "resync" : "recovery"),
3743 res/10, res % 10, resync, max_blocks);
3744
3745 /*
3746 * We do not want to overflow, so the order of operands and
3747 * the * 100 / 100 trick are important. We do a +1 to be
3748 * safe against division by zero. We only estimate anyway.
3749 *
3750 * dt: time from mark until now
3751 * db: blocks written from mark until now
3752 * rt: remaining time
3753 */
3754 dt = ((jiffies - mddev->resync_mark) / HZ);
3755 if (!dt) dt++;
3756 db = resync - (mddev->resync_mark_cnt/2);
3757 rt = (dt * ((max_blocks-resync) / (db/100+1)))/100;
3758
3759 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
3760
3761 seq_printf(seq, " speed=%ldK/sec", db/dt);
3762}
3763
3764static void *md_seq_start(struct seq_file *seq, loff_t *pos)
3765{
3766 struct list_head *tmp;
3767 loff_t l = *pos;
3768 mddev_t *mddev;
3769
3770 if (l >= 0x10000)
3771 return NULL;
3772 if (!l--)
3773 /* header */
3774 return (void*)1;
3775
3776 spin_lock(&all_mddevs_lock);
3777 list_for_each(tmp,&all_mddevs)
3778 if (!l--) {
3779 mddev = list_entry(tmp, mddev_t, all_mddevs);
3780 mddev_get(mddev);
3781 spin_unlock(&all_mddevs_lock);
3782 return mddev;
3783 }
3784 spin_unlock(&all_mddevs_lock);
3785 if (!l--)
3786 return (void*)2;/* tail */
3787 return NULL;
3788}
3789
3790static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3791{
3792 struct list_head *tmp;
3793 mddev_t *next_mddev, *mddev = v;
3794
3795 ++*pos;
3796 if (v == (void*)2)
3797 return NULL;
3798
3799 spin_lock(&all_mddevs_lock);
3800 if (v == (void*)1)
3801 tmp = all_mddevs.next;
3802 else
3803 tmp = mddev->all_mddevs.next;
3804 if (tmp != &all_mddevs)
3805 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
3806 else {
3807 next_mddev = (void*)2;
3808 *pos = 0x10000;
3809 }
3810 spin_unlock(&all_mddevs_lock);
3811
3812 if (v != (void*)1)
3813 mddev_put(mddev);
3814 return next_mddev;
3815
3816}
3817
3818static void md_seq_stop(struct seq_file *seq, void *v)
3819{
3820 mddev_t *mddev = v;
3821
3822 if (mddev && v != (void*)1 && v != (void*)2)
3823 mddev_put(mddev);
3824}
3825
d7603b7e
N		 3826struct mdstat_info {
3827 int event;
3828};
3829
1da177e4
LT		 3830static int md_seq_show(struct seq_file *seq, void *v)
3831{
3832 mddev_t *mddev = v;
3833 sector_t size;
3834 struct list_head *tmp2;
3835 mdk_rdev_t *rdev;
d7603b7e 3836 struct mdstat_info *mi = seq->private;
32a7627c 3837 struct bitmap *bitmap;
1da177e4
LT		 3838
3839 if (v == (void*)1) {
2604b703 3840 struct mdk_personality *pers;
1da177e4
LT		 3841 seq_printf(seq, "Personalities : ");
3842 spin_lock(&pers_lock);
2604b703
N		 3843 list_for_each_entry(pers, &pers_list, list)
3844 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT		 3845
3846 spin_unlock(&pers_lock);
3847 seq_printf(seq, "\n");
d7603b7e 3848 mi->event = atomic_read(&md_event_count);
1da177e4
LT		 3849 return 0;
3850 }
3851 if (v == (void*)2) {
3852 status_unused(seq);
3853 return 0;
3854 }
3855
3856 if (mddev_lock(mddev)!=0)
3857 return -EINTR;
3858 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
3859 seq_printf(seq, "%s : %sactive", mdname(mddev),
3860 mddev->pers ? "" : "in");
3861 if (mddev->pers) {
f91de92e 3862 if (mddev->ro==1)
1da177e4 3863 seq_printf(seq, " (read-only)");
f91de92e
N		 3864 if (mddev->ro==2)
3865 seq_printf(seq, "(auto-read-only)");
1da177e4
LT		 3866 seq_printf(seq, " %s", mddev->pers->name);
3867 }
3868
3869 size = 0;
3870 ITERATE_RDEV(mddev,rdev,tmp2) {
3871 char b[BDEVNAME_SIZE];
3872 seq_printf(seq, " %s[%d]",
3873 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 3874 if (test_bit(WriteMostly, &rdev->flags))
3875 seq_printf(seq, "(W)");
b2d444d7 3876 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 3877 seq_printf(seq, "(F)");
3878 continue;
b325a32e
N		 3879 } else if (rdev->raid_disk < 0)
3880 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 3881 size += rdev->size;
3882 }
3883
3884 if (!list_empty(&mddev->disks)) {
3885 if (mddev->pers)
3886 seq_printf(seq, "\n %llu blocks",
3887 (unsigned long long)mddev->array_size);
3888 else
3889 seq_printf(seq, "\n %llu blocks",
3890 (unsigned long long)size);
3891 }
1cd6bf19
N		 3892 if (mddev->persistent) {
3893 if (mddev->major_version != 0 ||
3894 mddev->minor_version != 90) {
3895 seq_printf(seq," super %d.%d",
3896 mddev->major_version,
3897 mddev->minor_version);
3898 }
3899 } else
3900 seq_printf(seq, " super non-persistent");
1da177e4
LT		 3901
3902 if (mddev->pers) {
3903 mddev->pers->status (seq, mddev);
3904 seq_printf(seq, "\n ");
8e1b39d6
N		 3905 if (mddev->pers->sync_request) {
3906 if (mddev->curr_resync > 2) {
3907 status_resync (seq, mddev);
3908 seq_printf(seq, "\n ");
3909 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
3910 seq_printf(seq, "\tresync=DELAYED\n ");
3911 else if (mddev->recovery_cp < MaxSector)
3912 seq_printf(seq, "\tresync=PENDING\n ");
3913 }
32a7627c
N		 3914 } else
3915 seq_printf(seq, "\n ");
3916
3917 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 3918 unsigned long chunk_kb;
3919 unsigned long flags;
32a7627c
N		 3920 spin_lock_irqsave(&bitmap->lock, flags);
3921 chunk_kb = bitmap->chunksize >> 10;
3922 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
3923 "%lu%s chunk",
3924 bitmap->pages - bitmap->missing_pages,
3925 bitmap->pages,
3926 (bitmap->pages - bitmap->missing_pages)
3927 << (PAGE_SHIFT - 10),
3928 chunk_kb ? chunk_kb : bitmap->chunksize,
3929 chunk_kb ? "KB" : "B");
78d742d8
N		 3930 if (bitmap->file) {
3931 seq_printf(seq, ", file: ");
3932 seq_path(seq, bitmap->file->f_vfsmnt,
3933 bitmap->file->f_dentry," \t\n");
32a7627c 3934 }
78d742d8 3935
32a7627c
N		 3936 seq_printf(seq, "\n");
3937 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 3938 }
3939
3940 seq_printf(seq, "\n");
3941 }
3942 mddev_unlock(mddev);
3943
3944 return 0;
3945}
3946
3947static struct seq_operations md_seq_ops = {
3948 .start = md_seq_start,
3949 .next = md_seq_next,
3950 .stop = md_seq_stop,
3951 .show = md_seq_show,
3952};
3953
3954static int md_seq_open(struct inode *inode, struct file *file)
3955{
3956 int error;
d7603b7e
N		 3957 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
3958 if (mi == NULL)
3959 return -ENOMEM;
1da177e4
LT		 3960
3961 error = seq_open(file, &md_seq_ops);
d7603b7e
N		 3962 if (error)
3963 kfree(mi);
3964 else {
3965 struct seq_file *p = file->private_data;
3966 p->private = mi;
3967 mi->event = atomic_read(&md_event_count);
3968 }
1da177e4
LT		 3969 return error;
3970}
3971
d7603b7e
N		 3972static int md_seq_release(struct inode *inode, struct file *file)
3973{
3974 struct seq_file *m = file->private_data;
3975 struct mdstat_info *mi = m->private;
3976 m->private = NULL;
3977 kfree(mi);
3978 return seq_release(inode, file);
3979}
3980
3981static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
3982{
3983 struct seq_file *m = filp->private_data;
3984 struct mdstat_info *mi = m->private;
3985 int mask;
3986
3987 poll_wait(filp, &md_event_waiters, wait);
3988
3989 /* always allow read */
3990 mask = POLLIN | POLLRDNORM;
3991
3992 if (mi->event != atomic_read(&md_event_count))
3993 mask |= POLLERR | POLLPRI;
3994 return mask;
3995}
3996
1da177e4
LT		 3997static struct file_operations md_seq_fops = {
3998 .open = md_seq_open,
3999 .read = seq_read,
4000 .llseek = seq_lseek,
d7603b7e
N		 4001 .release = md_seq_release,
4002 .poll = mdstat_poll,
1da177e4
LT		 4003};
4004
2604b703 4005int register_md_personality(struct mdk_personality *p)
1da177e4 4006{
1da177e4 4007 spin_lock(&pers_lock);
2604b703
N		 4008 list_add_tail(&p->list, &pers_list);
4009 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
1da177e4
LT		 4010 spin_unlock(&pers_lock);
4011 return 0;
4012}
4013
2604b703 4014int unregister_md_personality(struct mdk_personality *p)
1da177e4 4015{
2604b703 4016 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 4017 spin_lock(&pers_lock);
2604b703 4018 list_del_init(&p->list);
1da177e4
LT		 4019 spin_unlock(&pers_lock);
4020 return 0;
4021}
4022
4023static int is_mddev_idle(mddev_t *mddev)
4024{
4025 mdk_rdev_t * rdev;
4026 struct list_head *tmp;
4027 int idle;
4028 unsigned long curr_events;
4029
4030 idle = 1;
4031 ITERATE_RDEV(mddev,rdev,tmp) {
4032 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 4033 curr_events = disk_stat_read(disk, sectors[0]) +
4034 disk_stat_read(disk, sectors[1]) -
1da177e4 4035 atomic_read(&disk->sync_io);
c0e48521
N		 4036 /* The difference between curr_events and last_events
4037 * will be affected by any new non-sync IO (making
4038 * curr_events bigger) and any difference in the amount of
4039 * in-flight syncio (making current_events bigger or smaller)
4040 * The amount in-flight is currently limited to
4041 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4042 * which is at most 4096 sectors.
4043 * These numbers are fairly fragile and should be made
4044 * more robust, probably by enforcing the
4045 * 'window size' that md_do_sync sort-of uses.
4046 *
1da177e4
LT		 4047 * Note: the following is an unsigned comparison.
4048 */
c0e48521 4049 if ((curr_events - rdev->last_events + 4096) > 8192) {
1da177e4
LT		 4050 rdev->last_events = curr_events;
4051 idle = 0;
4052 }
4053 }
4054 return idle;
4055}
4056
4057void md_done_sync(mddev_t *mddev, int blocks, int ok)
4058{
4059 /* another "blocks" (512byte) blocks have been synced */
4060 atomic_sub(blocks, &mddev->recovery_active);
4061 wake_up(&mddev->recovery_wait);
4062 if (!ok) {
4063 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4064 md_wakeup_thread(mddev->thread);
4065 // stop recovery, signal do_sync ....
4066 }
4067}
4068
4069
06d91a5f
N		 4070/* md_write_start(mddev, bi)
4071 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 4072 * in superblock) before writing, schedule a superblock update
4073 * and wait for it to complete.
06d91a5f 4074 */
3d310eb7 4075void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 4076{
06d91a5f 4077 if (bio_data_dir(bi) != WRITE)
3d310eb7 4078 return;
06d91a5f 4079
f91de92e
N		 4080 BUG_ON(mddev->ro == 1);
4081 if (mddev->ro == 2) {
4082 /* need to switch to read/write */
4083 mddev->ro = 0;
4084 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4085 md_wakeup_thread(mddev->thread);
4086 }
06d91a5f 4087 atomic_inc(&mddev->writes_pending);
06d91a5f 4088 if (mddev->in_sync) {
a9701a30 4089 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 4090 if (mddev->in_sync) {
4091 mddev->in_sync = 0;
4092 mddev->sb_dirty = 1;
4093 md_wakeup_thread(mddev->thread);
4094 }
a9701a30 4095 spin_unlock_irq(&mddev->write_lock);
06d91a5f 4096 }
3d310eb7 4097 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
1da177e4
LT		 4098}
4099
4100void md_write_end(mddev_t *mddev)
4101{
4102 if (atomic_dec_and_test(&mddev->writes_pending)) {
4103 if (mddev->safemode == 2)
4104 md_wakeup_thread(mddev->thread);
4105 else
4106 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
4107 }
4108}
4109
75c96f85 4110static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
1da177e4
LT		 4111
4112#define SYNC_MARKS 10
4113#define SYNC_MARK_STEP (3*HZ)
4114static void md_do_sync(mddev_t *mddev)
4115{
4116 mddev_t *mddev2;
4117 unsigned int currspeed = 0,
4118 window;
57afd89f 4119 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 4120 unsigned long mark[SYNC_MARKS];
4121 sector_t mark_cnt[SYNC_MARKS];
4122 int last_mark,m;
4123 struct list_head *tmp;
4124 sector_t last_check;
57afd89f 4125 int skipped = 0;
1da177e4
LT		 4126
4127 /* just incase thread restarts... */
4128 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
4129 return;
4130
4131 /* we overload curr_resync somewhat here.
4132 * 0 == not engaged in resync at all
4133 * 2 == checking that there is no conflict with another sync
4134 * 1 == like 2, but have yielded to allow conflicting resync to
4135 * commense
4136 * other == active in resync - this many blocks
4137 *
4138 * Before starting a resync we must have set curr_resync to
4139 * 2, and then checked that every "conflicting" array has curr_resync
4140 * less than ours. When we find one that is the same or higher
4141 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
4142 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
4143 * This will mean we have to start checking from the beginning again.
4144 *
4145 */
4146
4147 do {
4148 mddev->curr_resync = 2;
4149
4150 try_again:
787453c2 4151 if (kthread_should_stop()) {
6985c43f 4152 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 4153 goto skip;
4154 }
4155 ITERATE_MDDEV(mddev2,tmp) {
1da177e4
LT		 4156 if (mddev2 == mddev)
4157 continue;
4158 if (mddev2->curr_resync &&
4159 match_mddev_units(mddev,mddev2)) {
4160 DEFINE_WAIT(wq);
4161 if (mddev < mddev2 && mddev->curr_resync == 2) {
4162 /* arbitrarily yield */
4163 mddev->curr_resync = 1;
4164 wake_up(&resync_wait);
4165 }
4166 if (mddev > mddev2 && mddev->curr_resync == 1)
4167 /* no need to wait here, we can wait the next
4168 * time 'round when curr_resync == 2
4169 */
4170 continue;
787453c2
N		 4171 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
4172 if (!kthread_should_stop() &&
8712e553 4173 mddev2->curr_resync >= mddev->curr_resync) {
1da177e4
LT		 4174 printk(KERN_INFO "md: delaying resync of %s"
4175 " until %s has finished resync (they"
4176 " share one or more physical units)\n",
4177 mdname(mddev), mdname(mddev2));
4178 mddev_put(mddev2);
4179 schedule();
4180 finish_wait(&resync_wait, &wq);
4181 goto try_again;
4182 }
4183 finish_wait(&resync_wait, &wq);
4184 }
4185 }
4186 } while (mddev->curr_resync < 2);
4187
9d88883e 4188 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 4189 /* resync follows the size requested by the personality,
57afd89f 4190 * which defaults to physical size, but can be virtual size
1da177e4
LT		 4191 */
4192 max_sectors = mddev->resync_max_sectors;
9d88883e
N		 4193 mddev->resync_mismatches = 0;
4194 } else
1da177e4
LT		 4195 /* recovery follows the physical size of devices */
4196 max_sectors = mddev->size << 1;
4197
4198 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
4199 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
4200 " %d KB/sec/disc.\n", sysctl_speed_limit_min);
338cec32 4201 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
1da177e4
LT		 4202 "(but not more than %d KB/sec) for reconstruction.\n",
4203 sysctl_speed_limit_max);
4204
4205 is_mddev_idle(mddev); /* this also initializes IO event counters */
32a7627c 4206 /* we don't use the checkpoint if there's a bitmap */
24dd469d
N		 4207 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap
4208 && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
1da177e4
LT		 4209 j = mddev->recovery_cp;
4210 else
4211 j = 0;
57afd89f 4212 io_sectors = 0;
1da177e4
LT		 4213 for (m = 0; m < SYNC_MARKS; m++) {
4214 mark[m] = jiffies;
57afd89f 4215 mark_cnt[m] = io_sectors;
1da177e4
LT		 4216 }
4217 last_mark = 0;
4218 mddev->resync_mark = mark[last_mark];
4219 mddev->resync_mark_cnt = mark_cnt[last_mark];
4220
4221 /*
4222 * Tune reconstruction:
4223 */
4224 window = 32*(PAGE_SIZE/512);
4225 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
4226 window/2,(unsigned long long) max_sectors/2);
4227
4228 atomic_set(&mddev->recovery_active, 0);
4229 init_waitqueue_head(&mddev->recovery_wait);
4230 last_check = 0;
4231
4232 if (j>2) {
4233 printk(KERN_INFO
4234 "md: resuming recovery of %s from checkpoint.\n",
4235 mdname(mddev));
4236 mddev->curr_resync = j;
4237 }
4238
4239 while (j < max_sectors) {
57afd89f 4240 sector_t sectors;
1da177e4 4241
57afd89f
N		 4242 skipped = 0;
4243 sectors = mddev->pers->sync_request(mddev, j, &skipped,
4244 currspeed < sysctl_speed_limit_min);
4245 if (sectors == 0) {
1da177e4
LT		 4246 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4247 goto out;
4248 }
57afd89f
N		 4249
4250 if (!skipped) { /* actual IO requested */
4251 io_sectors += sectors;
4252 atomic_add(sectors, &mddev->recovery_active);
4253 }
4254
1da177e4
LT		 4255 j += sectors;
4256 if (j>1) mddev->curr_resync = j;
d7603b7e
N		 4257 if (last_check == 0)
4258 /* this is the earliers that rebuilt will be
4259 * visible in /proc/mdstat
4260 */
4261 md_new_event(mddev);
57afd89f
N		 4262
4263 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 4264 continue;
4265
57afd89f 4266 last_check = io_sectors;
1da177e4
LT		 4267
4268 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
4269 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
4270 break;
4271
4272 repeat:
4273 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
4274 /* step marks */
4275 int next = (last_mark+1) % SYNC_MARKS;
4276
4277 mddev->resync_mark = mark[next];
4278 mddev->resync_mark_cnt = mark_cnt[next];
4279 mark[next] = jiffies;
57afd89f 4280 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 4281 last_mark = next;
4282 }
4283
4284
787453c2 4285 if (kthread_should_stop()) {
1da177e4
LT		 4286 /*
4287 * got a signal, exit.
4288 */
4289 printk(KERN_INFO
4290 "md: md_do_sync() got signal ... exiting\n");
1da177e4
LT		 4291 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4292 goto out;
4293 }
4294
4295 /*
4296 * this loop exits only if either when we are slower than
4297 * the 'hard' speed limit, or the system was IO-idle for
4298 * a jiffy.
4299 * the system might be non-idle CPU-wise, but we only care
4300 * about not overloading the IO subsystem. (things like an
4301 * e2fsck being done on the RAID array should execute fast)
4302 */
4303 mddev->queue->unplug_fn(mddev->queue);
4304 cond_resched();
4305
57afd89f
N		 4306 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
4307 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4
LT		 4308
4309 if (currspeed > sysctl_speed_limit_min) {
4310 if ((currspeed > sysctl_speed_limit_max) ||
4311 !is_mddev_idle(mddev)) {
c0e48521 4312 msleep(500);
1da177e4
LT		 4313 goto repeat;
4314 }
4315 }
4316 }
4317 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
4318 /*
4319 * this also signals 'finished resyncing' to md_stop
4320 */
4321 out:
4322 mddev->queue->unplug_fn(mddev->queue);
4323
4324 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
4325
4326 /* tell personality that we are finished */
57afd89f 4327 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 4328
4329 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4330 mddev->curr_resync > 2 &&
4331 mddev->curr_resync >= mddev->recovery_cp) {
4332 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4333 printk(KERN_INFO
4334 "md: checkpointing recovery of %s.\n",
4335 mdname(mddev));
4336 mddev->recovery_cp = mddev->curr_resync;
4337 } else
4338 mddev->recovery_cp = MaxSector;
4339 }
4340
1da177e4
LT		 4341 skip:
4342 mddev->curr_resync = 0;
4343 wake_up(&resync_wait);
4344 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
4345 md_wakeup_thread(mddev->thread);
4346}
4347
4348
4349/*
4350 * This routine is regularly called by all per-raid-array threads to
4351 * deal with generic issues like resync and super-block update.
4352 * Raid personalities that don't have a thread (linear/raid0) do not
4353 * need this as they never do any recovery or update the superblock.
4354 *
4355 * It does not do any resync itself, but rather "forks" off other threads
4356 * to do that as needed.
4357 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4358 * "->recovery" and create a thread at ->sync_thread.
4359 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4360 * and wakeups up this thread which will reap the thread and finish up.
4361 * This thread also removes any faulty devices (with nr_pending == 0).
4362 *
4363 * The overall approach is:
4364 * 1/ if the superblock needs updating, update it.
4365 * 2/ If a recovery thread is running, don't do anything else.
4366 * 3/ If recovery has finished, clean up, possibly marking spares active.
4367 * 4/ If there are any faulty devices, remove them.
4368 * 5/ If array is degraded, try to add spares devices
4369 * 6/ If array has spares or is not in-sync, start a resync thread.
4370 */
4371void md_check_recovery(mddev_t *mddev)
4372{
4373 mdk_rdev_t *rdev;
4374 struct list_head *rtmp;
4375
4376
5f40402d
N		 4377 if (mddev->bitmap)
4378 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 4379
4380 if (mddev->ro)
4381 return;
fca4d848
N		 4382
4383 if (signal_pending(current)) {
4384 if (mddev->pers->sync_request) {
4385 printk(KERN_INFO "md: %s in immediate safe mode\n",
4386 mdname(mddev));
4387 mddev->safemode = 2;
4388 }
4389 flush_signals(current);
4390 }
4391
1da177e4
LT		 4392 if ( ! (
4393 mddev->sb_dirty ||
4394 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848
N		 4395 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
4396 (mddev->safemode == 1) ||
4397 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
4398 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 4399 ))
4400 return;
fca4d848 4401
1da177e4
LT		 4402 if (mddev_trylock(mddev)==0) {
4403 int spares =0;
fca4d848 4404
a9701a30 4405 spin_lock_irq(&mddev->write_lock);
fca4d848
N		 4406 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
4407 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
4408 mddev->in_sync = 1;
4409 mddev->sb_dirty = 1;
4410 }
4411 if (mddev->safemode == 1)
4412 mddev->safemode = 0;
a9701a30 4413 spin_unlock_irq(&mddev->write_lock);
fca4d848 4414
1da177e4
LT		 4415 if (mddev->sb_dirty)
4416 md_update_sb(mddev);
06d91a5f 4417
06d91a5f 4418
1da177e4
LT		 4419 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4420 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
4421 /* resync/recovery still happening */
4422 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4423 goto unlock;
4424 }
4425 if (mddev->sync_thread) {
4426 /* resync has finished, collect result */
4427 md_unregister_thread(mddev->sync_thread);
4428 mddev->sync_thread = NULL;
4429 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4430 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4431 /* success...*/
4432 /* activate any spares */
4433 mddev->pers->spare_active(mddev);
4434 }
4435 md_update_sb(mddev);
41158c7e
N		 4436
4437 /* if array is no-longer degraded, then any saved_raid_disk
4438 * information must be scrapped
4439 */
4440 if (!mddev->degraded)
4441 ITERATE_RDEV(mddev,rdev,rtmp)
4442 rdev->saved_raid_disk = -1;
4443
1da177e4
LT		 4444 mddev->recovery = 0;
4445 /* flag recovery needed just to double check */
4446 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
d7603b7e 4447 md_new_event(mddev);
1da177e4
LT		 4448 goto unlock;
4449 }
24dd469d
N		 4450 /* Clear some bits that don't mean anything, but
4451 * might be left set
4452 */
4453 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4454 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
4455 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
4456 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4
LT		 4457
4458 /* no recovery is running.
4459 * remove any failed drives, then
4460 * add spares if possible.
4461 * Spare are also removed and re-added, to allow
4462 * the personality to fail the re-add.
4463 */
4464 ITERATE_RDEV(mddev,rdev,rtmp)
4465 if (rdev->raid_disk >= 0 &&
b2d444d7 4466 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
1da177e4 4467 atomic_read(&rdev->nr_pending)==0) {
86e6ffdd
N		 4468 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
4469 char nm[20];
4470 sprintf(nm,"rd%d", rdev->raid_disk);
4471 sysfs_remove_link(&mddev->kobj, nm);
1da177e4 4472 rdev->raid_disk = -1;
86e6ffdd 4473 }
1da177e4
LT		 4474 }
4475
4476 if (mddev->degraded) {
4477 ITERATE_RDEV(mddev,rdev,rtmp)
4478 if (rdev->raid_disk < 0
b2d444d7 4479 && !test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 4480 if (mddev->pers->hot_add_disk(mddev,rdev)) {
4481 char nm[20];
4482 sprintf(nm, "rd%d", rdev->raid_disk);
4483 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
1da177e4 4484 spares++;
d7603b7e 4485 md_new_event(mddev);
86e6ffdd 4486 } else
1da177e4
LT		 4487 break;
4488 }
4489 }
4490
24dd469d
N		 4491 if (spares) {
4492 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4493 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4494 } else if (mddev->recovery_cp < MaxSector) {
4495 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4496 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4497 /* nothing to be done ... */
1da177e4 4498 goto unlock;
24dd469d 4499
1da177e4
LT		 4500 if (mddev->pers->sync_request) {
4501 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 4502 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
4503 /* We are adding a device or devices to an array
4504 * which has the bitmap stored on all devices.
4505 * So make sure all bitmap pages get written
4506 */
4507 bitmap_write_all(mddev->bitmap);
4508 }
1da177e4
LT		 4509 mddev->sync_thread = md_register_thread(md_do_sync,
4510 mddev,
4511 "%s_resync");
4512 if (!mddev->sync_thread) {
4513 printk(KERN_ERR "%s: could not start resync"
4514 " thread...\n",
4515 mdname(mddev));
4516 /* leave the spares where they are, it shouldn't hurt */
4517 mddev->recovery = 0;
d7603b7e 4518 } else
1da177e4 4519 md_wakeup_thread(mddev->sync_thread);
d7603b7e 4520 md_new_event(mddev);
1da177e4
LT		 4521 }
4522 unlock:
4523 mddev_unlock(mddev);
4524 }
4525}
4526
75c96f85
AB		 4527static int md_notify_reboot(struct notifier_block *this,
4528 unsigned long code, void *x)
1da177e4
LT		 4529{
4530 struct list_head *tmp;
4531 mddev_t *mddev;
4532
4533 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
4534
4535 printk(KERN_INFO "md: stopping all md devices.\n");
4536
4537 ITERATE_MDDEV(mddev,tmp)
4538 if (mddev_trylock(mddev)==0)
4539 do_md_stop (mddev, 1);
4540 /*
4541 * certain more exotic SCSI devices are known to be
4542 * volatile wrt too early system reboots. While the
4543 * right place to handle this issue is the given
4544 * driver, we do want to have a safe RAID driver ...
4545 */
4546 mdelay(1000*1);
4547 }
4548 return NOTIFY_DONE;
4549}
4550
75c96f85 4551static struct notifier_block md_notifier = {
1da177e4
LT		 4552 .notifier_call = md_notify_reboot,
4553 .next = NULL,
4554 .priority = INT_MAX, /* before any real devices */
4555};
4556
4557static void md_geninit(void)
4558{
4559 struct proc_dir_entry *p;
4560
4561 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
4562
4563 p = create_proc_entry("mdstat", S_IRUGO, NULL);
4564 if (p)
4565 p->proc_fops = &md_seq_fops;
4566}
4567
75c96f85 4568static int __init md_init(void)
1da177e4
LT		 4569{
4570 int minor;
4571
4572 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4573 " MD_SB_DISKS=%d\n",
4574 MD_MAJOR_VERSION, MD_MINOR_VERSION,
4575 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
bd926c63 4576 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
32a7627c 4577 BITMAP_MINOR);
1da177e4
LT		 4578
4579 if (register_blkdev(MAJOR_NR, "md"))
4580 return -1;
4581 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
4582 unregister_blkdev(MAJOR_NR, "md");
4583 return -1;
4584 }
4585 devfs_mk_dir("md");
4586 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
4587 md_probe, NULL, NULL);
4588 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
4589 md_probe, NULL, NULL);
4590
4591 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4592 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
4593 S_IFBLK|S_IRUSR|S_IWUSR,
4594 "md/%d", minor);
4595
4596 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4597 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
4598 S_IFBLK|S_IRUSR|S_IWUSR,
4599 "md/mdp%d", minor);
4600
4601
4602 register_reboot_notifier(&md_notifier);
4603 raid_table_header = register_sysctl_table(raid_root_table, 1);
4604
4605 md_geninit();
4606 return (0);
4607}
4608
4609
4610#ifndef MODULE
4611
4612/*
4613 * Searches all registered partitions for autorun RAID arrays
4614 * at boot time.
4615 */
4616static dev_t detected_devices[128];
4617static int dev_cnt;
4618
4619void md_autodetect_dev(dev_t dev)
4620{
4621 if (dev_cnt >= 0 && dev_cnt < 127)
4622 detected_devices[dev_cnt++] = dev;
4623}
4624
4625
4626static void autostart_arrays(int part)
4627{
4628 mdk_rdev_t *rdev;
4629 int i;
4630
4631 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
4632
4633 for (i = 0; i < dev_cnt; i++) {
4634 dev_t dev = detected_devices[i];
4635
4636 rdev = md_import_device(dev,0, 0);
4637 if (IS_ERR(rdev))
4638 continue;
4639
b2d444d7 4640 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4641 MD_BUG();
4642 continue;
4643 }
4644 list_add(&rdev->same_set, &pending_raid_disks);
4645 }
4646 dev_cnt = 0;
4647
4648 autorun_devices(part);
4649}
4650
4651#endif
4652
4653static __exit void md_exit(void)
4654{
4655 mddev_t *mddev;
4656 struct list_head *tmp;
4657 int i;
4658 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
4659 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
4660 for (i=0; i < MAX_MD_DEVS; i++)
4661 devfs_remove("md/%d", i);
4662 for (i=0; i < MAX_MD_DEVS; i++)
4663 devfs_remove("md/d%d", i);
4664
4665 devfs_remove("md");
4666
4667 unregister_blkdev(MAJOR_NR,"md");
4668 unregister_blkdev(mdp_major, "mdp");
4669 unregister_reboot_notifier(&md_notifier);
4670 unregister_sysctl_table(raid_table_header);
4671 remove_proc_entry("mdstat", NULL);
4672 ITERATE_MDDEV(mddev,tmp) {
4673 struct gendisk *disk = mddev->gendisk;
4674 if (!disk)
4675 continue;
4676 export_array(mddev);
4677 del_gendisk(disk);
4678 put_disk(disk);
4679 mddev->gendisk = NULL;
4680 mddev_put(mddev);
4681 }
4682}
4683
4684module_init(md_init)
4685module_exit(md_exit)
4686
f91de92e
N		 4687static int get_ro(char *buffer, struct kernel_param *kp)
4688{
4689 return sprintf(buffer, "%d", start_readonly);
4690}
4691static int set_ro(const char *val, struct kernel_param *kp)
4692{
4693 char *e;
4694 int num = simple_strtoul(val, &e, 10);
4695 if (*val && (*e == '\0' || *e == '\n')) {
4696 start_readonly = num;
4697 return 0;;
4698 }
4699 return -EINVAL;
4700}
4701
4702module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
6ff8d8ec
N		 4703module_param(start_dirty_degraded, int, 0644);
4704
f91de92e 4705
1da177e4
LT		 4706EXPORT_SYMBOL(register_md_personality);
4707EXPORT_SYMBOL(unregister_md_personality);
4708EXPORT_SYMBOL(md_error);
4709EXPORT_SYMBOL(md_done_sync);
4710EXPORT_SYMBOL(md_write_start);
4711EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 4712EXPORT_SYMBOL(md_register_thread);
4713EXPORT_SYMBOL(md_unregister_thread);
4714EXPORT_SYMBOL(md_wakeup_thread);
4715EXPORT_SYMBOL(md_print_devices);
4716EXPORT_SYMBOL(md_check_recovery);
4717MODULE_LICENSE("GPL");
aa1595e9 4718MODULE_ALIAS("md");
72008652 4719MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
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