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[PATCH] md: fix rdev->pending counts in raid1
[net-next-2.6.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
24dd469d 1797static ssize_t
7eec314d 1798action_show(mddev_t *mddev, char *page)
24dd469d 1799{
7eec314d 1800 char *type = "idle";
31399d9e
N		 1801 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
1802 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
1803 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N		 1804 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
1805 type = "resync";
1806 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
1807 type = "check";
1808 else
1809 type = "repair";
1810 } else
1811 type = "recover";
1812 }
1813 return sprintf(page, "%s\n", type);
1814}
1815
1816static ssize_t
7eec314d 1817action_store(mddev_t *mddev, const char *page, size_t len)
24dd469d 1818{
7eec314d
N		 1819 if (!mddev->pers || !mddev->pers->sync_request)
1820 return -EINVAL;
1821
bce74dac 1822 if (cmd_match(page, "idle")) {
7eec314d
N		 1823 if (mddev->sync_thread) {
1824 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1825 md_unregister_thread(mddev->sync_thread);
1826 mddev->sync_thread = NULL;
1827 mddev->recovery = 0;
1828 }
03c902e1
N		 1829 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
1830 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 1831 return -EBUSY;
03c902e1 1832 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
7eec314d
N		 1833 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
1834 else {
bce74dac 1835 if (cmd_match(page, "check"))
7eec314d 1836 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
bce74dac 1837 else if (cmd_match(page, "repair"))
7eec314d
N		 1838 return -EINVAL;
1839 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
1840 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7eec314d 1841 }
03c902e1 1842 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d
N		 1843 md_wakeup_thread(mddev->thread);
1844 return len;
1845}
1846
9d88883e 1847static ssize_t
96de1e66 1848mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 1849{
1850 return sprintf(page, "%llu\n",
1851 (unsigned long long) mddev->resync_mismatches);
1852}
1853
96de1e66 1854static struct md_sysfs_entry
7eec314d 1855md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 1856
96de1e66
N		 1857
1858static struct md_sysfs_entry
1859md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 1860
eae1701f
N		 1861static struct attribute *md_default_attrs[] = {
1862 &md_level.attr,
1863 &md_raid_disks.attr,
411036fa
N		 1864 NULL,
1865};
1866
1867static struct attribute *md_redundancy_attrs[] = {
24dd469d 1868 &md_scan_mode.attr,
9d88883e 1869 &md_mismatches.attr,
eae1701f
N		 1870 NULL,
1871};
411036fa
N		 1872static struct attribute_group md_redundancy_group = {
1873 .name = NULL,
1874 .attrs = md_redundancy_attrs,
1875};
1876
eae1701f
N		 1877
1878static ssize_t
1879md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1880{
1881 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
1882 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 1883 ssize_t rv;
eae1701f
N		 1884
1885 if (!entry->show)
1886 return -EIO;
96de1e66
N		 1887 mddev_lock(mddev);
1888 rv = entry->show(mddev, page);
1889 mddev_unlock(mddev);
1890 return rv;
eae1701f
N		 1891}
1892
1893static ssize_t
1894md_attr_store(struct kobject *kobj, struct attribute *attr,
1895 const char *page, size_t length)
1896{
1897 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
1898 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 1899 ssize_t rv;
eae1701f
N		 1900
1901 if (!entry->store)
1902 return -EIO;
96de1e66
N		 1903 mddev_lock(mddev);
1904 rv = entry->store(mddev, page, length);
1905 mddev_unlock(mddev);
1906 return rv;
eae1701f
N		 1907}
1908
1909static void md_free(struct kobject *ko)
1910{
1911 mddev_t *mddev = container_of(ko, mddev_t, kobj);
1912 kfree(mddev);
1913}
1914
1915static struct sysfs_ops md_sysfs_ops = {
1916 .show = md_attr_show,
1917 .store = md_attr_store,
1918};
1919static struct kobj_type md_ktype = {
1920 .release = md_free,
1921 .sysfs_ops = &md_sysfs_ops,
1922 .default_attrs = md_default_attrs,
1923};
1924
1da177e4
LT		 1925int mdp_major = 0;
1926
1927static struct kobject *md_probe(dev_t dev, int *part, void *data)
1928{
1929 static DECLARE_MUTEX(disks_sem);
1930 mddev_t *mddev = mddev_find(dev);
1931 struct gendisk *disk;
1932 int partitioned = (MAJOR(dev) != MD_MAJOR);
1933 int shift = partitioned ? MdpMinorShift : 0;
1934 int unit = MINOR(dev) >> shift;
1935
1936 if (!mddev)
1937 return NULL;
1938
1939 down(&disks_sem);
1940 if (mddev->gendisk) {
1941 up(&disks_sem);
1942 mddev_put(mddev);
1943 return NULL;
1944 }
1945 disk = alloc_disk(1 << shift);
1946 if (!disk) {
1947 up(&disks_sem);
1948 mddev_put(mddev);
1949 return NULL;
1950 }
1951 disk->major = MAJOR(dev);
1952 disk->first_minor = unit << shift;
1953 if (partitioned) {
1954 sprintf(disk->disk_name, "md_d%d", unit);
1955 sprintf(disk->devfs_name, "md/d%d", unit);
1956 } else {
1957 sprintf(disk->disk_name, "md%d", unit);
1958 sprintf(disk->devfs_name, "md/%d", unit);
1959 }
1960 disk->fops = &md_fops;
1961 disk->private_data = mddev;
1962 disk->queue = mddev->queue;
1963 add_disk(disk);
1964 mddev->gendisk = disk;
1965 up(&disks_sem);
9c791977 1966 mddev->kobj.parent = &disk->kobj;
eae1701f
N		 1967 mddev->kobj.k_name = NULL;
1968 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
1969 mddev->kobj.ktype = &md_ktype;
1970 kobject_register(&mddev->kobj);
1da177e4
LT		 1971 return NULL;
1972}
1973
1974void md_wakeup_thread(mdk_thread_t *thread);
1975
1976static void md_safemode_timeout(unsigned long data)
1977{
1978 mddev_t *mddev = (mddev_t *) data;
1979
1980 mddev->safemode = 1;
1981 md_wakeup_thread(mddev->thread);
1982}
1983
6ff8d8ec 1984static int start_dirty_degraded;
1da177e4
LT		 1985
1986static int do_md_run(mddev_t * mddev)
1987{
2604b703 1988 int err;
1da177e4
LT		 1989 int chunk_size;
1990 struct list_head *tmp;
1991 mdk_rdev_t *rdev;
1992 struct gendisk *disk;
2604b703 1993 struct mdk_personality *pers;
1da177e4
LT		 1994 char b[BDEVNAME_SIZE];
1995
a757e64c
N		 1996 if (list_empty(&mddev->disks))
1997 /* cannot run an array with no devices.. */
1da177e4 1998 return -EINVAL;
1da177e4
LT		 1999
2000 if (mddev->pers)
2001 return -EBUSY;
2002
2003 /*
2004 * Analyze all RAID superblock(s)
2005 */
a757e64c
N		 2006 if (!mddev->raid_disks)
2007 analyze_sbs(mddev);
1da177e4
LT		 2008
2009 chunk_size = mddev->chunk_size;
2604b703
N		 2010
2011 if (chunk_size) {
1da177e4
LT		 2012 if (chunk_size > MAX_CHUNK_SIZE) {
2013 printk(KERN_ERR "too big chunk_size: %d > %d\n",
2014 chunk_size, MAX_CHUNK_SIZE);
2015 return -EINVAL;
2016 }
2017 /*
2018 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2019 */
2020 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 2021 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 2022 return -EINVAL;
2023 }
2024 if (chunk_size < PAGE_SIZE) {
2025 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
2026 chunk_size, PAGE_SIZE);
2027 return -EINVAL;
2028 }
2029
2030 /* devices must have minimum size of one chunk */
2031 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2032 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2033 continue;
2034 if (rdev->size < chunk_size / 1024) {
2035 printk(KERN_WARNING
2036 "md: Dev %s smaller than chunk_size:"
2037 " %lluk < %dk\n",
2038 bdevname(rdev->bdev,b),
2039 (unsigned long long)rdev->size,
2040 chunk_size / 1024);
2041 return -EINVAL;
2042 }
2043 }
2044 }
2045
1da177e4 2046#ifdef CONFIG_KMOD
2604b703 2047 request_module("md-level-%d", mddev->level);
1da177e4
LT		 2048#endif
2049
2050 /*
2051 * Drop all container device buffers, from now on
2052 * the only valid external interface is through the md
2053 * device.
2054 * Also find largest hardsector size
2055 */
2056 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2057 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2058 continue;
2059 sync_blockdev(rdev->bdev);
2060 invalidate_bdev(rdev->bdev, 0);
2061 }
2062
2063 md_probe(mddev->unit, NULL, NULL);
2064 disk = mddev->gendisk;
2065 if (!disk)
2066 return -ENOMEM;
2067
2068 spin_lock(&pers_lock);
2604b703
N		 2069 pers = find_pers(mddev->level);
2070 if (!pers || !try_module_get(pers->owner)) {
1da177e4 2071 spin_unlock(&pers_lock);
2604b703
N		 2072 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
2073 mddev->level);
1da177e4
LT		 2074 return -EINVAL;
2075 }
2604b703 2076 mddev->pers = pers;
1da177e4
LT		 2077 spin_unlock(&pers_lock);
2078
657390d2 2079 mddev->recovery = 0;
1da177e4 2080 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 2081 mddev->barriers_work = 1;
6ff8d8ec 2082 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 2083
f91de92e
N		 2084 if (start_readonly)
2085 mddev->ro = 2; /* read-only, but switch on first write */
2086
b15c2e57
N		 2087 err = mddev->pers->run(mddev);
2088 if (!err && mddev->pers->sync_request) {
2089 err = bitmap_create(mddev);
2090 if (err) {
2091 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
2092 mdname(mddev), err);
2093 mddev->pers->stop(mddev);
2094 }
2095 }
1da177e4
LT		 2096 if (err) {
2097 printk(KERN_ERR "md: pers->run() failed ...\n");
2098 module_put(mddev->pers->owner);
2099 mddev->pers = NULL;
32a7627c
N		 2100 bitmap_destroy(mddev);
2101 return err;
1da177e4 2102 }
411036fa
N		 2103 if (mddev->pers->sync_request)
2104 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
fd9d49ca
N		 2105 else if (mddev->ro == 2) /* auto-readonly not meaningful */
2106 mddev->ro = 0;
2107
1da177e4
LT		 2108 atomic_set(&mddev->writes_pending,0);
2109 mddev->safemode = 0;
2110 mddev->safemode_timer.function = md_safemode_timeout;
2111 mddev->safemode_timer.data = (unsigned long) mddev;
2112 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */
2113 mddev->in_sync = 1;
86e6ffdd
N		 2114
2115 ITERATE_RDEV(mddev,rdev,tmp)
2116 if (rdev->raid_disk >= 0) {
2117 char nm[20];
2118 sprintf(nm, "rd%d", rdev->raid_disk);
2119 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2120 }
1da177e4
LT		 2121
2122 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 2123 md_wakeup_thread(mddev->thread);
1da177e4
LT		 2124
2125 if (mddev->sb_dirty)
2126 md_update_sb(mddev);
2127
2128 set_capacity(disk, mddev->array_size<<1);
2129
2130 /* If we call blk_queue_make_request here, it will
2131 * re-initialise max_sectors etc which may have been
2132 * refined inside -> run. So just set the bits we need to set.
2133 * Most initialisation happended when we called
2134 * blk_queue_make_request(..., md_fail_request)
2135 * earlier.
2136 */
2137 mddev->queue->queuedata = mddev;
2138 mddev->queue->make_request_fn = mddev->pers->make_request;
2139
2140 mddev->changed = 1;
d7603b7e 2141 md_new_event(mddev);
1da177e4
LT		 2142 return 0;
2143}
2144
2145static int restart_array(mddev_t *mddev)
2146{
2147 struct gendisk *disk = mddev->gendisk;
2148 int err;
2149
2150 /*
2151 * Complain if it has no devices
2152 */
2153 err = -ENXIO;
2154 if (list_empty(&mddev->disks))
2155 goto out;
2156
2157 if (mddev->pers) {
2158 err = -EBUSY;
2159 if (!mddev->ro)
2160 goto out;
2161
2162 mddev->safemode = 0;
2163 mddev->ro = 0;
2164 set_disk_ro(disk, 0);
2165
2166 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2167 mdname(mddev));
2168 /*
2169 * Kick recovery or resync if necessary
2170 */
2171 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2172 md_wakeup_thread(mddev->thread);
2173 err = 0;
2174 } else {
2175 printk(KERN_ERR "md: %s has no personality assigned.\n",
2176 mdname(mddev));
2177 err = -EINVAL;
2178 }
2179
2180out:
2181 return err;
2182}
2183
2184static int do_md_stop(mddev_t * mddev, int ro)
2185{
2186 int err = 0;
2187 struct gendisk *disk = mddev->gendisk;
2188
2189 if (mddev->pers) {
2190 if (atomic_read(&mddev->active)>2) {
2191 printk("md: %s still in use.\n",mdname(mddev));
2192 return -EBUSY;
2193 }
2194
2195 if (mddev->sync_thread) {
2196 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2197 md_unregister_thread(mddev->sync_thread);
2198 mddev->sync_thread = NULL;
2199 }
2200
2201 del_timer_sync(&mddev->safemode_timer);
2202
2203 invalidate_partition(disk, 0);
2204
2205 if (ro) {
2206 err = -ENXIO;
f91de92e 2207 if (mddev->ro==1)
1da177e4
LT		 2208 goto out;
2209 mddev->ro = 1;
2210 } else {
6b8b3e8a 2211 bitmap_flush(mddev);
a9701a30 2212 md_super_wait(mddev);
1da177e4
LT		 2213 if (mddev->ro)
2214 set_disk_ro(disk, 0);
2215 blk_queue_make_request(mddev->queue, md_fail_request);
2216 mddev->pers->stop(mddev);
411036fa
N		 2217 if (mddev->pers->sync_request)
2218 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
2219
1da177e4
LT		 2220 module_put(mddev->pers->owner);
2221 mddev->pers = NULL;
2222 if (mddev->ro)
2223 mddev->ro = 0;
2224 }
2225 if (!mddev->in_sync) {
2226 /* mark array as shutdown cleanly */
2227 mddev->in_sync = 1;
2228 md_update_sb(mddev);
2229 }
2230 if (ro)
2231 set_disk_ro(disk, 1);
2232 }
32a7627c
N		 2233
2234 bitmap_destroy(mddev);
2235 if (mddev->bitmap_file) {
2236 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
2237 fput(mddev->bitmap_file);
2238 mddev->bitmap_file = NULL;
2239 }
9223214e 2240 mddev->bitmap_offset = 0;
32a7627c 2241
1da177e4
LT		 2242 /*
2243 * Free resources if final stop
2244 */
2245 if (!ro) {
86e6ffdd
N		 2246 mdk_rdev_t *rdev;
2247 struct list_head *tmp;
1da177e4
LT		 2248 struct gendisk *disk;
2249 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
2250
86e6ffdd
N		 2251 ITERATE_RDEV(mddev,rdev,tmp)
2252 if (rdev->raid_disk >= 0) {
2253 char nm[20];
2254 sprintf(nm, "rd%d", rdev->raid_disk);
2255 sysfs_remove_link(&mddev->kobj, nm);
2256 }
2257
1da177e4
LT		 2258 export_array(mddev);
2259
2260 mddev->array_size = 0;
2261 disk = mddev->gendisk;
2262 if (disk)
2263 set_capacity(disk, 0);
2264 mddev->changed = 1;
2265 } else
2266 printk(KERN_INFO "md: %s switched to read-only mode.\n",
2267 mdname(mddev));
2268 err = 0;
d7603b7e 2269 md_new_event(mddev);
1da177e4
LT		 2270out:
2271 return err;
2272}
2273
2274static void autorun_array(mddev_t *mddev)
2275{
2276 mdk_rdev_t *rdev;
2277 struct list_head *tmp;
2278 int err;
2279
a757e64c 2280 if (list_empty(&mddev->disks))
1da177e4 2281 return;
1da177e4
LT		 2282
2283 printk(KERN_INFO "md: running: ");
2284
2285 ITERATE_RDEV(mddev,rdev,tmp) {
2286 char b[BDEVNAME_SIZE];
2287 printk("<%s>", bdevname(rdev->bdev,b));
2288 }
2289 printk("\n");
2290
2291 err = do_md_run (mddev);
2292 if (err) {
2293 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
2294 do_md_stop (mddev, 0);
2295 }
2296}
2297
2298/*
2299 * lets try to run arrays based on all disks that have arrived
2300 * until now. (those are in pending_raid_disks)
2301 *
2302 * the method: pick the first pending disk, collect all disks with
2303 * the same UUID, remove all from the pending list and put them into
2304 * the 'same_array' list. Then order this list based on superblock
2305 * update time (freshest comes first), kick out 'old' disks and
2306 * compare superblocks. If everything's fine then run it.
2307 *
2308 * If "unit" is allocated, then bump its reference count
2309 */
2310static void autorun_devices(int part)
2311{
2312 struct list_head candidates;
2313 struct list_head *tmp;
2314 mdk_rdev_t *rdev0, *rdev;
2315 mddev_t *mddev;
2316 char b[BDEVNAME_SIZE];
2317
2318 printk(KERN_INFO "md: autorun ...\n");
2319 while (!list_empty(&pending_raid_disks)) {
2320 dev_t dev;
2321 rdev0 = list_entry(pending_raid_disks.next,
2322 mdk_rdev_t, same_set);
2323
2324 printk(KERN_INFO "md: considering %s ...\n",
2325 bdevname(rdev0->bdev,b));
2326 INIT_LIST_HEAD(&candidates);
2327 ITERATE_RDEV_PENDING(rdev,tmp)
2328 if (super_90_load(rdev, rdev0, 0) >= 0) {
2329 printk(KERN_INFO "md: adding %s ...\n",
2330 bdevname(rdev->bdev,b));
2331 list_move(&rdev->same_set, &candidates);
2332 }
2333 /*
2334 * now we have a set of devices, with all of them having
2335 * mostly sane superblocks. It's time to allocate the
2336 * mddev.
2337 */
2338 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
2339 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
2340 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
2341 break;
2342 }
2343 if (part)
2344 dev = MKDEV(mdp_major,
2345 rdev0->preferred_minor << MdpMinorShift);
2346 else
2347 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
2348
2349 md_probe(dev, NULL, NULL);
2350 mddev = mddev_find(dev);
2351 if (!mddev) {
2352 printk(KERN_ERR
2353 "md: cannot allocate memory for md drive.\n");
2354 break;
2355 }
2356 if (mddev_lock(mddev))
2357 printk(KERN_WARNING "md: %s locked, cannot run\n",
2358 mdname(mddev));
2359 else if (mddev->raid_disks || mddev->major_version
2360 || !list_empty(&mddev->disks)) {
2361 printk(KERN_WARNING
2362 "md: %s already running, cannot run %s\n",
2363 mdname(mddev), bdevname(rdev0->bdev,b));
2364 mddev_unlock(mddev);
2365 } else {
2366 printk(KERN_INFO "md: created %s\n", mdname(mddev));
2367 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
2368 list_del_init(&rdev->same_set);
2369 if (bind_rdev_to_array(rdev, mddev))
2370 export_rdev(rdev);
2371 }
2372 autorun_array(mddev);
2373 mddev_unlock(mddev);
2374 }
2375 /* on success, candidates will be empty, on error
2376 * it won't...
2377 */
2378 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
2379 export_rdev(rdev);
2380 mddev_put(mddev);
2381 }
2382 printk(KERN_INFO "md: ... autorun DONE.\n");
2383}
2384
2385/*
2386 * import RAID devices based on one partition
2387 * if possible, the array gets run as well.
2388 */
2389
2390static int autostart_array(dev_t startdev)
2391{
2392 char b[BDEVNAME_SIZE];
2393 int err = -EINVAL, i;
2394 mdp_super_t *sb = NULL;
2395 mdk_rdev_t *start_rdev = NULL, *rdev;
2396
2397 start_rdev = md_import_device(startdev, 0, 0);
2398 if (IS_ERR(start_rdev))
2399 return err;
2400
2401
2402 /* NOTE: this can only work for 0.90.0 superblocks */
2403 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
2404 if (sb->major_version != 0 ||
2405 sb->minor_version != 90 ) {
2406 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
2407 export_rdev(start_rdev);
2408 return err;
2409 }
2410
b2d444d7 2411 if (test_bit(Faulty, &start_rdev->flags)) {
1da177e4
LT		 2412 printk(KERN_WARNING
2413 "md: can not autostart based on faulty %s!\n",
2414 bdevname(start_rdev->bdev,b));
2415 export_rdev(start_rdev);
2416 return err;
2417 }
2418 list_add(&start_rdev->same_set, &pending_raid_disks);
2419
2420 for (i = 0; i < MD_SB_DISKS; i++) {
2421 mdp_disk_t *desc = sb->disks + i;
2422 dev_t dev = MKDEV(desc->major, desc->minor);
2423
2424 if (!dev)
2425 continue;
2426 if (dev == startdev)
2427 continue;
2428 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
2429 continue;
2430 rdev = md_import_device(dev, 0, 0);
2431 if (IS_ERR(rdev))
2432 continue;
2433
2434 list_add(&rdev->same_set, &pending_raid_disks);
2435 }
2436
2437 /*
2438 * possibly return codes
2439 */
2440 autorun_devices(0);
2441 return 0;
2442
2443}
2444
2445
2446static int get_version(void __user * arg)
2447{
2448 mdu_version_t ver;
2449
2450 ver.major = MD_MAJOR_VERSION;
2451 ver.minor = MD_MINOR_VERSION;
2452 ver.patchlevel = MD_PATCHLEVEL_VERSION;
2453
2454 if (copy_to_user(arg, &ver, sizeof(ver)))
2455 return -EFAULT;
2456
2457 return 0;
2458}
2459
2460static int get_array_info(mddev_t * mddev, void __user * arg)
2461{
2462 mdu_array_info_t info;
2463 int nr,working,active,failed,spare;
2464 mdk_rdev_t *rdev;
2465 struct list_head *tmp;
2466
2467 nr=working=active=failed=spare=0;
2468 ITERATE_RDEV(mddev,rdev,tmp) {
2469 nr++;
b2d444d7 2470 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2471 failed++;
2472 else {
2473 working++;
b2d444d7 2474 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 2475 active++;
2476 else
2477 spare++;
2478 }
2479 }
2480
2481 info.major_version = mddev->major_version;
2482 info.minor_version = mddev->minor_version;
2483 info.patch_version = MD_PATCHLEVEL_VERSION;
2484 info.ctime = mddev->ctime;
2485 info.level = mddev->level;
2486 info.size = mddev->size;
2487 info.nr_disks = nr;
2488 info.raid_disks = mddev->raid_disks;
2489 info.md_minor = mddev->md_minor;
2490 info.not_persistent= !mddev->persistent;
2491
2492 info.utime = mddev->utime;
2493 info.state = 0;
2494 if (mddev->in_sync)
2495 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 2496 if (mddev->bitmap && mddev->bitmap_offset)
2497 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 2498 info.active_disks = active;
2499 info.working_disks = working;
2500 info.failed_disks = failed;
2501 info.spare_disks = spare;
2502
2503 info.layout = mddev->layout;
2504 info.chunk_size = mddev->chunk_size;
2505
2506 if (copy_to_user(arg, &info, sizeof(info)))
2507 return -EFAULT;
2508
2509 return 0;
2510}
2511
87162a28 2512static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 2513{
2514 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
2515 char *ptr, *buf = NULL;
2516 int err = -ENOMEM;
2517
2518 file = kmalloc(sizeof(*file), GFP_KERNEL);
2519 if (!file)
2520 goto out;
2521
2522 /* bitmap disabled, zero the first byte and copy out */
2523 if (!mddev->bitmap || !mddev->bitmap->file) {
2524 file->pathname[0] = '\0';
2525 goto copy_out;
2526 }
2527
2528 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
2529 if (!buf)
2530 goto out;
2531
2532 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
2533 if (!ptr)
2534 goto out;
2535
2536 strcpy(file->pathname, ptr);
2537
2538copy_out:
2539 err = 0;
2540 if (copy_to_user(arg, file, sizeof(*file)))
2541 err = -EFAULT;
2542out:
2543 kfree(buf);
2544 kfree(file);
2545 return err;
2546}
2547
1da177e4
LT		 2548static int get_disk_info(mddev_t * mddev, void __user * arg)
2549{
2550 mdu_disk_info_t info;
2551 unsigned int nr;
2552 mdk_rdev_t *rdev;
2553
2554 if (copy_from_user(&info, arg, sizeof(info)))
2555 return -EFAULT;
2556
2557 nr = info.number;
2558
2559 rdev = find_rdev_nr(mddev, nr);
2560 if (rdev) {
2561 info.major = MAJOR(rdev->bdev->bd_dev);
2562 info.minor = MINOR(rdev->bdev->bd_dev);
2563 info.raid_disk = rdev->raid_disk;
2564 info.state = 0;
b2d444d7 2565 if (test_bit(Faulty, &rdev->flags))
1da177e4 2566 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 2567 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 2568 info.state |= (1<<MD_DISK_ACTIVE);
2569 info.state |= (1<<MD_DISK_SYNC);
2570 }
8ddf9efe
N		 2571 if (test_bit(WriteMostly, &rdev->flags))
2572 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 2573 } else {
2574 info.major = info.minor = 0;
2575 info.raid_disk = -1;
2576 info.state = (1<<MD_DISK_REMOVED);
2577 }
2578
2579 if (copy_to_user(arg, &info, sizeof(info)))
2580 return -EFAULT;
2581
2582 return 0;
2583}
2584
2585static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
2586{
2587 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
2588 mdk_rdev_t *rdev;
2589 dev_t dev = MKDEV(info->major,info->minor);
2590
2591 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
2592 return -EOVERFLOW;
2593
2594 if (!mddev->raid_disks) {
2595 int err;
2596 /* expecting a device which has a superblock */
2597 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
2598 if (IS_ERR(rdev)) {
2599 printk(KERN_WARNING
2600 "md: md_import_device returned %ld\n",
2601 PTR_ERR(rdev));
2602 return PTR_ERR(rdev);
2603 }
2604 if (!list_empty(&mddev->disks)) {
2605 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2606 mdk_rdev_t, same_set);
2607 int err = super_types[mddev->major_version]
2608 .load_super(rdev, rdev0, mddev->minor_version);
2609 if (err < 0) {
2610 printk(KERN_WARNING
2611 "md: %s has different UUID to %s\n",
2612 bdevname(rdev->bdev,b),
2613 bdevname(rdev0->bdev,b2));
2614 export_rdev(rdev);
2615 return -EINVAL;
2616 }
2617 }
2618 err = bind_rdev_to_array(rdev, mddev);
2619 if (err)
2620 export_rdev(rdev);
2621 return err;
2622 }
2623
2624 /*
2625 * add_new_disk can be used once the array is assembled
2626 * to add "hot spares". They must already have a superblock
2627 * written
2628 */
2629 if (mddev->pers) {
2630 int err;
2631 if (!mddev->pers->hot_add_disk) {
2632 printk(KERN_WARNING
2633 "%s: personality does not support diskops!\n",
2634 mdname(mddev));
2635 return -EINVAL;
2636 }
7b1e35f6
N		 2637 if (mddev->persistent)
2638 rdev = md_import_device(dev, mddev->major_version,
2639 mddev->minor_version);
2640 else
2641 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 2642 if (IS_ERR(rdev)) {
2643 printk(KERN_WARNING
2644 "md: md_import_device returned %ld\n",
2645 PTR_ERR(rdev));
2646 return PTR_ERR(rdev);
2647 }
41158c7e
N		 2648 /* set save_raid_disk if appropriate */
2649 if (!mddev->persistent) {
2650 if (info->state & (1<<MD_DISK_SYNC) &&
2651 info->raid_disk < mddev->raid_disks)
2652 rdev->raid_disk = info->raid_disk;
2653 else
2654 rdev->raid_disk = -1;
2655 } else
2656 super_types[mddev->major_version].
2657 validate_super(mddev, rdev);
2658 rdev->saved_raid_disk = rdev->raid_disk;
2659
b2d444d7 2660 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 2661 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
2662 set_bit(WriteMostly, &rdev->flags);
2663
1da177e4
LT		 2664 rdev->raid_disk = -1;
2665 err = bind_rdev_to_array(rdev, mddev);
2666 if (err)
2667 export_rdev(rdev);
c361777f
N		 2668
2669 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 2670 md_wakeup_thread(mddev->thread);
1da177e4
LT		 2671 return err;
2672 }
2673
2674 /* otherwise, add_new_disk is only allowed
2675 * for major_version==0 superblocks
2676 */
2677 if (mddev->major_version != 0) {
2678 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
2679 mdname(mddev));
2680 return -EINVAL;
2681 }
2682
2683 if (!(info->state & (1<<MD_DISK_FAULTY))) {
2684 int err;
2685 rdev = md_import_device (dev, -1, 0);
2686 if (IS_ERR(rdev)) {
2687 printk(KERN_WARNING
2688 "md: error, md_import_device() returned %ld\n",
2689 PTR_ERR(rdev));
2690 return PTR_ERR(rdev);
2691 }
2692 rdev->desc_nr = info->number;
2693 if (info->raid_disk < mddev->raid_disks)
2694 rdev->raid_disk = info->raid_disk;
2695 else
2696 rdev->raid_disk = -1;
2697
b2d444d7
N		 2698 rdev->flags = 0;
2699
1da177e4 2700 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 2701 if (info->state & (1<<MD_DISK_SYNC))
2702 set_bit(In_sync, &rdev->flags);
1da177e4 2703
8ddf9efe
N		 2704 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
2705 set_bit(WriteMostly, &rdev->flags);
2706
1da177e4
LT		 2707 err = bind_rdev_to_array(rdev, mddev);
2708 if (err) {
2709 export_rdev(rdev);
2710 return err;
2711 }
2712
2713 if (!mddev->persistent) {
2714 printk(KERN_INFO "md: nonpersistent superblock ...\n");
2715 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2716 } else
2717 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
2718 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
2719
2720 if (!mddev->size || (mddev->size > rdev->size))
2721 mddev->size = rdev->size;
2722 }
2723
2724 return 0;
2725}
2726
2727static int hot_remove_disk(mddev_t * mddev, dev_t dev)
2728{
2729 char b[BDEVNAME_SIZE];
2730 mdk_rdev_t *rdev;
2731
2732 if (!mddev->pers)
2733 return -ENODEV;
2734
2735 rdev = find_rdev(mddev, dev);
2736 if (!rdev)
2737 return -ENXIO;
2738
2739 if (rdev->raid_disk >= 0)
2740 goto busy;
2741
2742 kick_rdev_from_array(rdev);
2743 md_update_sb(mddev);
d7603b7e 2744 md_new_event(mddev);
1da177e4
LT		 2745
2746 return 0;
2747busy:
2748 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
2749 bdevname(rdev->bdev,b), mdname(mddev));
2750 return -EBUSY;
2751}
2752
2753static int hot_add_disk(mddev_t * mddev, dev_t dev)
2754{
2755 char b[BDEVNAME_SIZE];
2756 int err;
2757 unsigned int size;
2758 mdk_rdev_t *rdev;
2759
2760 if (!mddev->pers)
2761 return -ENODEV;
2762
2763 if (mddev->major_version != 0) {
2764 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
2765 " version-0 superblocks.\n",
2766 mdname(mddev));
2767 return -EINVAL;
2768 }
2769 if (!mddev->pers->hot_add_disk) {
2770 printk(KERN_WARNING
2771 "%s: personality does not support diskops!\n",
2772 mdname(mddev));
2773 return -EINVAL;
2774 }
2775
2776 rdev = md_import_device (dev, -1, 0);
2777 if (IS_ERR(rdev)) {
2778 printk(KERN_WARNING
2779 "md: error, md_import_device() returned %ld\n",
2780 PTR_ERR(rdev));
2781 return -EINVAL;
2782 }
2783
2784 if (mddev->persistent)
2785 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
2786 else
2787 rdev->sb_offset =
2788 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2789
2790 size = calc_dev_size(rdev, mddev->chunk_size);
2791 rdev->size = size;
2792
2793 if (size < mddev->size) {
2794 printk(KERN_WARNING
2795 "%s: disk size %llu blocks < array size %llu\n",
2796 mdname(mddev), (unsigned long long)size,
2797 (unsigned long long)mddev->size);
2798 err = -ENOSPC;
2799 goto abort_export;
2800 }
2801
b2d444d7 2802 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 2803 printk(KERN_WARNING
2804 "md: can not hot-add faulty %s disk to %s!\n",
2805 bdevname(rdev->bdev,b), mdname(mddev));
2806 err = -EINVAL;
2807 goto abort_export;
2808 }
b2d444d7 2809 clear_bit(In_sync, &rdev->flags);
1da177e4
LT		 2810 rdev->desc_nr = -1;
2811 bind_rdev_to_array(rdev, mddev);
2812
2813 /*
2814 * The rest should better be atomic, we can have disk failures
2815 * noticed in interrupt contexts ...
2816 */
2817
2818 if (rdev->desc_nr == mddev->max_disks) {
2819 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
2820 mdname(mddev));
2821 err = -EBUSY;
2822 goto abort_unbind_export;
2823 }
2824
2825 rdev->raid_disk = -1;
2826
2827 md_update_sb(mddev);
2828
2829 /*
2830 * Kick recovery, maybe this spare has to be added to the
2831 * array immediately.
2832 */
2833 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2834 md_wakeup_thread(mddev->thread);
d7603b7e 2835 md_new_event(mddev);
1da177e4
LT		 2836 return 0;
2837
2838abort_unbind_export:
2839 unbind_rdev_from_array(rdev);
2840
2841abort_export:
2842 export_rdev(rdev);
2843 return err;
2844}
2845
32a7627c
N		 2846/* similar to deny_write_access, but accounts for our holding a reference
2847 * to the file ourselves */
2848static int deny_bitmap_write_access(struct file * file)
2849{
2850 struct inode *inode = file->f_mapping->host;
2851
2852 spin_lock(&inode->i_lock);
2853 if (atomic_read(&inode->i_writecount) > 1) {
2854 spin_unlock(&inode->i_lock);
2855 return -ETXTBSY;
2856 }
2857 atomic_set(&inode->i_writecount, -1);
2858 spin_unlock(&inode->i_lock);
2859
2860 return 0;
2861}
2862
2863static int set_bitmap_file(mddev_t *mddev, int fd)
2864{
2865 int err;
2866
36fa3063
N		 2867 if (mddev->pers) {
2868 if (!mddev->pers->quiesce)
2869 return -EBUSY;
2870 if (mddev->recovery || mddev->sync_thread)
2871 return -EBUSY;
2872 /* we should be able to change the bitmap.. */
2873 }
32a7627c 2874
32a7627c 2875
36fa3063
N		 2876 if (fd >= 0) {
2877 if (mddev->bitmap)
2878 return -EEXIST; /* cannot add when bitmap is present */
2879 mddev->bitmap_file = fget(fd);
32a7627c 2880
36fa3063
N		 2881 if (mddev->bitmap_file == NULL) {
2882 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
2883 mdname(mddev));
2884 return -EBADF;
2885 }
2886
2887 err = deny_bitmap_write_access(mddev->bitmap_file);
2888 if (err) {
2889 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
2890 mdname(mddev));
2891 fput(mddev->bitmap_file);
2892 mddev->bitmap_file = NULL;
2893 return err;
2894 }
a654b9d8 2895 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 2896 } else if (mddev->bitmap == NULL)
2897 return -ENOENT; /* cannot remove what isn't there */
2898 err = 0;
2899 if (mddev->pers) {
2900 mddev->pers->quiesce(mddev, 1);
2901 if (fd >= 0)
2902 err = bitmap_create(mddev);
2903 if (fd < 0 || err)
2904 bitmap_destroy(mddev);
2905 mddev->pers->quiesce(mddev, 0);
2906 } else if (fd < 0) {
2907 if (mddev->bitmap_file)
2908 fput(mddev->bitmap_file);
2909 mddev->bitmap_file = NULL;
2910 }
2911
32a7627c
N		 2912 return err;
2913}
2914
1da177e4
LT		 2915/*
2916 * set_array_info is used two different ways
2917 * The original usage is when creating a new array.
2918 * In this usage, raid_disks is > 0 and it together with
2919 * level, size, not_persistent,layout,chunksize determine the
2920 * shape of the array.
2921 * This will always create an array with a type-0.90.0 superblock.
2922 * The newer usage is when assembling an array.
2923 * In this case raid_disks will be 0, and the major_version field is
2924 * use to determine which style super-blocks are to be found on the devices.
2925 * The minor and patch _version numbers are also kept incase the
2926 * super_block handler wishes to interpret them.
2927 */
2928static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
2929{
2930
2931 if (info->raid_disks == 0) {
2932 /* just setting version number for superblock loading */
2933 if (info->major_version < 0 ||
2934 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
2935 super_types[info->major_version].name == NULL) {
2936 /* maybe try to auto-load a module? */
2937 printk(KERN_INFO
2938 "md: superblock version %d not known\n",
2939 info->major_version);
2940 return -EINVAL;
2941 }
2942 mddev->major_version = info->major_version;
2943 mddev->minor_version = info->minor_version;
2944 mddev->patch_version = info->patch_version;
2945 return 0;
2946 }
2947 mddev->major_version = MD_MAJOR_VERSION;
2948 mddev->minor_version = MD_MINOR_VERSION;
2949 mddev->patch_version = MD_PATCHLEVEL_VERSION;
2950 mddev->ctime = get_seconds();
2951
2952 mddev->level = info->level;
2953 mddev->size = info->size;
2954 mddev->raid_disks = info->raid_disks;
2955 /* don't set md_minor, it is determined by which /dev/md* was
2956 * openned
2957 */
2958 if (info->state & (1<<MD_SB_CLEAN))
2959 mddev->recovery_cp = MaxSector;
2960 else
2961 mddev->recovery_cp = 0;
2962 mddev->persistent = ! info->not_persistent;
2963
2964 mddev->layout = info->layout;
2965 mddev->chunk_size = info->chunk_size;
2966
2967 mddev->max_disks = MD_SB_DISKS;
2968
2969 mddev->sb_dirty = 1;
2970
b2a2703c
N		 2971 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
2972 mddev->bitmap_offset = 0;
2973
1da177e4
LT		 2974 /*
2975 * Generate a 128 bit UUID
2976 */
2977 get_random_bytes(mddev->uuid, 16);
2978
2979 return 0;
2980}
2981
2982/*
2983 * update_array_info is used to change the configuration of an
2984 * on-line array.
2985 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
2986 * fields in the info are checked against the array.
2987 * Any differences that cannot be handled will cause an error.
2988 * Normally, only one change can be managed at a time.
2989 */
2990static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
2991{
2992 int rv = 0;
2993 int cnt = 0;
36fa3063
N		 2994 int state = 0;
2995
2996 /* calculate expected state,ignoring low bits */
2997 if (mddev->bitmap && mddev->bitmap_offset)
2998 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 2999
3000 if (mddev->major_version != info->major_version ||
3001 mddev->minor_version != info->minor_version ||
3002/* mddev->patch_version != info->patch_version || */
3003 mddev->ctime != info->ctime ||
3004 mddev->level != info->level ||
3005/* mddev->layout != info->layout || */
3006 !mddev->persistent != info->not_persistent||
36fa3063
N		 3007 mddev->chunk_size != info->chunk_size ||
3008 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
3009 ((state^info->state) & 0xfffffe00)
3010 )
1da177e4
LT		 3011 return -EINVAL;
3012 /* Check there is only one change */
3013 if (mddev->size != info->size) cnt++;
3014 if (mddev->raid_disks != info->raid_disks) cnt++;
3015 if (mddev->layout != info->layout) cnt++;
36fa3063 3016 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 3017 if (cnt == 0) return 0;
3018 if (cnt > 1) return -EINVAL;
3019
3020 if (mddev->layout != info->layout) {
3021 /* Change layout
3022 * we don't need to do anything at the md level, the
3023 * personality will take care of it all.
3024 */
3025 if (mddev->pers->reconfig == NULL)
3026 return -EINVAL;
3027 else
3028 return mddev->pers->reconfig(mddev, info->layout, -1);
3029 }
3030 if (mddev->size != info->size) {
3031 mdk_rdev_t * rdev;
3032 struct list_head *tmp;
3033 if (mddev->pers->resize == NULL)
3034 return -EINVAL;
3035 /* The "size" is the amount of each device that is used.
3036 * This can only make sense for arrays with redundancy.
3037 * linear and raid0 always use whatever space is available
3038 * We can only consider changing the size if no resync
3039 * or reconstruction is happening, and if the new size
3040 * is acceptable. It must fit before the sb_offset or,
3041 * if that is <data_offset, it must fit before the
3042 * size of each device.
3043 * If size is zero, we find the largest size that fits.
3044 */
3045 if (mddev->sync_thread)
3046 return -EBUSY;
3047 ITERATE_RDEV(mddev,rdev,tmp) {
3048 sector_t avail;
3049 int fit = (info->size == 0);
3050 if (rdev->sb_offset > rdev->data_offset)
3051 avail = (rdev->sb_offset*2) - rdev->data_offset;
3052 else
3053 avail = get_capacity(rdev->bdev->bd_disk)
3054 - rdev->data_offset;
3055 if (fit && (info->size == 0 || info->size > avail/2))
3056 info->size = avail/2;
3057 if (avail < ((sector_t)info->size << 1))
3058 return -ENOSPC;
3059 }
3060 rv = mddev->pers->resize(mddev, (sector_t)info->size *2);
3061 if (!rv) {
3062 struct block_device *bdev;
3063
3064 bdev = bdget_disk(mddev->gendisk, 0);
3065 if (bdev) {
3066 down(&bdev->bd_inode->i_sem);
3067 i_size_write(bdev->bd_inode, mddev->array_size << 10);
3068 up(&bdev->bd_inode->i_sem);
3069 bdput(bdev);
3070 }
3071 }
3072 }
3073 if (mddev->raid_disks != info->raid_disks) {
3074 /* change the number of raid disks */
3075 if (mddev->pers->reshape == NULL)
3076 return -EINVAL;
3077 if (info->raid_disks <= 0 ||
3078 info->raid_disks >= mddev->max_disks)
3079 return -EINVAL;
3080 if (mddev->sync_thread)
3081 return -EBUSY;
3082 rv = mddev->pers->reshape(mddev, info->raid_disks);
3083 if (!rv) {
3084 struct block_device *bdev;
3085
3086 bdev = bdget_disk(mddev->gendisk, 0);
3087 if (bdev) {
3088 down(&bdev->bd_inode->i_sem);
3089 i_size_write(bdev->bd_inode, mddev->array_size << 10);
3090 up(&bdev->bd_inode->i_sem);
3091 bdput(bdev);
3092 }
3093 }
3094 }
36fa3063
N		 3095 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
3096 if (mddev->pers->quiesce == NULL)
3097 return -EINVAL;
3098 if (mddev->recovery || mddev->sync_thread)
3099 return -EBUSY;
3100 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
3101 /* add the bitmap */
3102 if (mddev->bitmap)
3103 return -EEXIST;
3104 if (mddev->default_bitmap_offset == 0)
3105 return -EINVAL;
3106 mddev->bitmap_offset = mddev->default_bitmap_offset;
3107 mddev->pers->quiesce(mddev, 1);
3108 rv = bitmap_create(mddev);
3109 if (rv)
3110 bitmap_destroy(mddev);
3111 mddev->pers->quiesce(mddev, 0);
3112 } else {
3113 /* remove the bitmap */
3114 if (!mddev->bitmap)
3115 return -ENOENT;
3116 if (mddev->bitmap->file)
3117 return -EINVAL;
3118 mddev->pers->quiesce(mddev, 1);
3119 bitmap_destroy(mddev);
3120 mddev->pers->quiesce(mddev, 0);
3121 mddev->bitmap_offset = 0;
3122 }
3123 }
1da177e4
LT		 3124 md_update_sb(mddev);
3125 return rv;
3126}
3127
3128static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3129{
3130 mdk_rdev_t *rdev;
3131
3132 if (mddev->pers == NULL)
3133 return -ENODEV;
3134
3135 rdev = find_rdev(mddev, dev);
3136 if (!rdev)
3137 return -ENODEV;
3138
3139 md_error(mddev, rdev);
3140 return 0;
3141}
3142
3143static int md_ioctl(struct inode *inode, struct file *file,
3144 unsigned int cmd, unsigned long arg)
3145{
3146 int err = 0;
3147 void __user *argp = (void __user *)arg;
3148 struct hd_geometry __user *loc = argp;
3149 mddev_t *mddev = NULL;
3150
3151 if (!capable(CAP_SYS_ADMIN))
3152 return -EACCES;
3153
3154 /*
3155 * Commands dealing with the RAID driver but not any
3156 * particular array:
3157 */
3158 switch (cmd)
3159 {
3160 case RAID_VERSION:
3161 err = get_version(argp);
3162 goto done;
3163
3164 case PRINT_RAID_DEBUG:
3165 err = 0;
3166 md_print_devices();
3167 goto done;
3168
3169#ifndef MODULE
3170 case RAID_AUTORUN:
3171 err = 0;
3172 autostart_arrays(arg);
3173 goto done;
3174#endif
3175 default:;
3176 }
3177
3178 /*
3179 * Commands creating/starting a new array:
3180 */
3181
3182 mddev = inode->i_bdev->bd_disk->private_data;
3183
3184 if (!mddev) {
3185 BUG();
3186 goto abort;
3187 }
3188
3189
3190 if (cmd == START_ARRAY) {
3191 /* START_ARRAY doesn't need to lock the array as autostart_array
3192 * does the locking, and it could even be a different array
3193 */
3194 static int cnt = 3;
3195 if (cnt > 0 ) {
3196 printk(KERN_WARNING
3197 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
e8a00334 3198 "This will not be supported beyond July 2006\n",
1da177e4
LT		 3199 current->comm, current->pid);
3200 cnt--;
3201 }
3202 err = autostart_array(new_decode_dev(arg));
3203 if (err) {
3204 printk(KERN_WARNING "md: autostart failed!\n");
3205 goto abort;
3206 }
3207 goto done;
3208 }
3209
3210 err = mddev_lock(mddev);
3211 if (err) {
3212 printk(KERN_INFO
3213 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3214 err, cmd);
3215 goto abort;
3216 }
3217
3218 switch (cmd)
3219 {
3220 case SET_ARRAY_INFO:
3221 {
3222 mdu_array_info_t info;
3223 if (!arg)
3224 memset(&info, 0, sizeof(info));
3225 else if (copy_from_user(&info, argp, sizeof(info))) {
3226 err = -EFAULT;
3227 goto abort_unlock;
3228 }
3229 if (mddev->pers) {
3230 err = update_array_info(mddev, &info);
3231 if (err) {
3232 printk(KERN_WARNING "md: couldn't update"
3233 " array info. %d\n", err);
3234 goto abort_unlock;
3235 }
3236 goto done_unlock;
3237 }
3238 if (!list_empty(&mddev->disks)) {
3239 printk(KERN_WARNING
3240 "md: array %s already has disks!\n",
3241 mdname(mddev));
3242 err = -EBUSY;
3243 goto abort_unlock;
3244 }
3245 if (mddev->raid_disks) {
3246 printk(KERN_WARNING
3247 "md: array %s already initialised!\n",
3248 mdname(mddev));
3249 err = -EBUSY;
3250 goto abort_unlock;
3251 }
3252 err = set_array_info(mddev, &info);
3253 if (err) {
3254 printk(KERN_WARNING "md: couldn't set"
3255 " array info. %d\n", err);
3256 goto abort_unlock;
3257 }
3258 }
3259 goto done_unlock;
3260
3261 default:;
3262 }
3263
3264 /*
3265 * Commands querying/configuring an existing array:
3266 */
32a7627c
N		 3267 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3268 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3269 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3270 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
1da177e4
LT		 3271 err = -ENODEV;
3272 goto abort_unlock;
3273 }
3274
3275 /*
3276 * Commands even a read-only array can execute:
3277 */
3278 switch (cmd)
3279 {
3280 case GET_ARRAY_INFO:
3281 err = get_array_info(mddev, argp);
3282 goto done_unlock;
3283
32a7627c 3284 case GET_BITMAP_FILE:
87162a28 3285 err = get_bitmap_file(mddev, argp);
32a7627c
N		 3286 goto done_unlock;
3287
1da177e4
LT		 3288 case GET_DISK_INFO:
3289 err = get_disk_info(mddev, argp);
3290 goto done_unlock;
3291
3292 case RESTART_ARRAY_RW:
3293 err = restart_array(mddev);
3294 goto done_unlock;
3295
3296 case STOP_ARRAY:
3297 err = do_md_stop (mddev, 0);
3298 goto done_unlock;
3299
3300 case STOP_ARRAY_RO:
3301 err = do_md_stop (mddev, 1);
3302 goto done_unlock;
3303
3304 /*
3305 * We have a problem here : there is no easy way to give a CHS
3306 * virtual geometry. We currently pretend that we have a 2 heads
3307 * 4 sectors (with a BIG number of cylinders...). This drives
3308 * dosfs just mad... ;-)
3309 */
3310 case HDIO_GETGEO:
3311 if (!loc) {
3312 err = -EINVAL;
3313 goto abort_unlock;
3314 }
3315 err = put_user (2, (char __user *) &loc->heads);
3316 if (err)
3317 goto abort_unlock;
3318 err = put_user (4, (char __user *) &loc->sectors);
3319 if (err)
3320 goto abort_unlock;
3321 err = put_user(get_capacity(mddev->gendisk)/8,
3322 (short __user *) &loc->cylinders);
3323 if (err)
3324 goto abort_unlock;
3325 err = put_user (get_start_sect(inode->i_bdev),
3326 (long __user *) &loc->start);
3327 goto done_unlock;
3328 }
3329
3330 /*
3331 * The remaining ioctls are changing the state of the
f91de92e
N		 3332 * superblock, so we do not allow them on read-only arrays.
3333 * However non-MD ioctls (e.g. get-size) will still come through
3334 * here and hit the 'default' below, so only disallow
3335 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 3336 */
f91de92e
N		 3337 if (_IOC_TYPE(cmd) == MD_MAJOR &&
3338 mddev->ro && mddev->pers) {
3339 if (mddev->ro == 2) {
3340 mddev->ro = 0;
3341 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3342 md_wakeup_thread(mddev->thread);
3343
3344 } else {
3345 err = -EROFS;
3346 goto abort_unlock;
3347 }
1da177e4
LT		 3348 }
3349
3350 switch (cmd)
3351 {
3352 case ADD_NEW_DISK:
3353 {
3354 mdu_disk_info_t info;
3355 if (copy_from_user(&info, argp, sizeof(info)))
3356 err = -EFAULT;
3357 else
3358 err = add_new_disk(mddev, &info);
3359 goto done_unlock;
3360 }
3361
3362 case HOT_REMOVE_DISK:
3363 err = hot_remove_disk(mddev, new_decode_dev(arg));
3364 goto done_unlock;
3365
3366 case HOT_ADD_DISK:
3367 err = hot_add_disk(mddev, new_decode_dev(arg));
3368 goto done_unlock;
3369
3370 case SET_DISK_FAULTY:
3371 err = set_disk_faulty(mddev, new_decode_dev(arg));
3372 goto done_unlock;
3373
3374 case RUN_ARRAY:
3375 err = do_md_run (mddev);
3376 goto done_unlock;
3377
32a7627c
N		 3378 case SET_BITMAP_FILE:
3379 err = set_bitmap_file(mddev, (int)arg);
3380 goto done_unlock;
3381
1da177e4
LT		 3382 default:
3383 if (_IOC_TYPE(cmd) == MD_MAJOR)
3384 printk(KERN_WARNING "md: %s(pid %d) used"
3385 " obsolete MD ioctl, upgrade your"
3386 " software to use new ictls.\n",
3387 current->comm, current->pid);
3388 err = -EINVAL;
3389 goto abort_unlock;
3390 }
3391
3392done_unlock:
3393abort_unlock:
3394 mddev_unlock(mddev);
3395
3396 return err;
3397done:
3398 if (err)
3399 MD_BUG();
3400abort:
3401 return err;
3402}
3403
3404static int md_open(struct inode *inode, struct file *file)
3405{
3406 /*
3407 * Succeed if we can lock the mddev, which confirms that
3408 * it isn't being stopped right now.
3409 */
3410 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3411 int err;
3412
3413 if ((err = mddev_lock(mddev)))
3414 goto out;
3415
3416 err = 0;
3417 mddev_get(mddev);
3418 mddev_unlock(mddev);
3419
3420 check_disk_change(inode->i_bdev);
3421 out:
3422 return err;
3423}
3424
3425static int md_release(struct inode *inode, struct file * file)
3426{
3427 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3428
3429 if (!mddev)
3430 BUG();
3431 mddev_put(mddev);
3432
3433 return 0;
3434}
3435
3436static int md_media_changed(struct gendisk *disk)
3437{
3438 mddev_t *mddev = disk->private_data;
3439
3440 return mddev->changed;
3441}
3442
3443static int md_revalidate(struct gendisk *disk)
3444{
3445 mddev_t *mddev = disk->private_data;
3446
3447 mddev->changed = 0;
3448 return 0;
3449}
3450static struct block_device_operations md_fops =
3451{
3452 .owner = THIS_MODULE,
3453 .open = md_open,
3454 .release = md_release,
3455 .ioctl = md_ioctl,
3456 .media_changed = md_media_changed,
3457 .revalidate_disk= md_revalidate,
3458};
3459
75c96f85 3460static int md_thread(void * arg)
1da177e4
LT		 3461{
3462 mdk_thread_t *thread = arg;
3463
1da177e4
LT		 3464 /*
3465 * md_thread is a 'system-thread', it's priority should be very
3466 * high. We avoid resource deadlocks individually in each
3467 * raid personality. (RAID5 does preallocation) We also use RR and
3468 * the very same RT priority as kswapd, thus we will never get
3469 * into a priority inversion deadlock.
3470 *
3471 * we definitely have to have equal or higher priority than
3472 * bdflush, otherwise bdflush will deadlock if there are too
3473 * many dirty RAID5 blocks.
3474 */
1da177e4 3475
6985c43f 3476 allow_signal(SIGKILL);
a6fb0934 3477 while (!kthread_should_stop()) {
1da177e4 3478
93588e22
N		 3479 /* We need to wait INTERRUPTIBLE so that
3480 * we don't add to the load-average.
3481 * That means we need to be sure no signals are
3482 * pending
3483 */
3484 if (signal_pending(current))
3485 flush_signals(current);
3486
3487 wait_event_interruptible_timeout
3488 (thread->wqueue,
3489 test_bit(THREAD_WAKEUP, &thread->flags)
3490 || kthread_should_stop(),
3491 thread->timeout);
3e1d1d28 3492 try_to_freeze();
1da177e4
LT		 3493
3494 clear_bit(THREAD_WAKEUP, &thread->flags);
3495
787453c2 3496 thread->run(thread->mddev);
1da177e4 3497 }
a6fb0934 3498
1da177e4
LT		 3499 return 0;
3500}
3501
3502void md_wakeup_thread(mdk_thread_t *thread)
3503{
3504 if (thread) {
3505 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
3506 set_bit(THREAD_WAKEUP, &thread->flags);
3507 wake_up(&thread->wqueue);
3508 }
3509}
3510
3511mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
3512 const char *name)
3513{
3514 mdk_thread_t *thread;
1da177e4 3515
9ffae0cf 3516 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 3517 if (!thread)
3518 return NULL;
3519
1da177e4
LT		 3520 init_waitqueue_head(&thread->wqueue);
3521
1da177e4
LT		 3522 thread->run = run;
3523 thread->mddev = mddev;
32a7627c 3524 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 3525 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 3526 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 3527 kfree(thread);
3528 return NULL;
3529 }
1da177e4
LT		 3530 return thread;
3531}
3532
1da177e4
LT		 3533void md_unregister_thread(mdk_thread_t *thread)
3534{
d28446fe 3535 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
a6fb0934
N		 3536
3537 kthread_stop(thread->tsk);
1da177e4
LT		 3538 kfree(thread);
3539}
3540
3541void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
3542{
3543 if (!mddev) {
3544 MD_BUG();
3545 return;
3546 }
3547
b2d444d7 3548 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 3549 return;
32a7627c 3550/*
1da177e4
LT		 3551 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
3552 mdname(mddev),
3553 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
3554 __builtin_return_address(0),__builtin_return_address(1),
3555 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 3556*/
1da177e4
LT		 3557 if (!mddev->pers->error_handler)
3558 return;
3559 mddev->pers->error_handler(mddev,rdev);
3560 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3561 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3562 md_wakeup_thread(mddev->thread);
d7603b7e 3563 md_new_event(mddev);
1da177e4
LT		 3564}
3565
3566/* seq_file implementation /proc/mdstat */
3567
3568static void status_unused(struct seq_file *seq)
3569{
3570 int i = 0;
3571 mdk_rdev_t *rdev;
3572 struct list_head *tmp;
3573
3574 seq_printf(seq, "unused devices: ");
3575
3576 ITERATE_RDEV_PENDING(rdev,tmp) {
3577 char b[BDEVNAME_SIZE];
3578 i++;
3579 seq_printf(seq, "%s ",
3580 bdevname(rdev->bdev,b));
3581 }
3582 if (!i)
3583 seq_printf(seq, "<none>");
3584
3585 seq_printf(seq, "\n");
3586}
3587
3588
3589static void status_resync(struct seq_file *seq, mddev_t * mddev)
3590{
3591 unsigned long max_blocks, resync, res, dt, db, rt;
3592
3593 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
3594
3595 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3596 max_blocks = mddev->resync_max_sectors >> 1;
3597 else
3598 max_blocks = mddev->size;
3599
3600 /*
3601 * Should not happen.
3602 */
3603 if (!max_blocks) {
3604 MD_BUG();
3605 return;
3606 }
3607 res = (resync/1024)*1000/(max_blocks/1024 + 1);
3608 {
3609 int i, x = res/50, y = 20-x;
3610 seq_printf(seq, "[");
3611 for (i = 0; i < x; i++)
3612 seq_printf(seq, "=");
3613 seq_printf(seq, ">");
3614 for (i = 0; i < y; i++)
3615 seq_printf(seq, ".");
3616 seq_printf(seq, "] ");
3617 }
3618 seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)",
3619 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
3620 "resync" : "recovery"),
3621 res/10, res % 10, resync, max_blocks);
3622
3623 /*
3624 * We do not want to overflow, so the order of operands and
3625 * the * 100 / 100 trick are important. We do a +1 to be
3626 * safe against division by zero. We only estimate anyway.
3627 *
3628 * dt: time from mark until now
3629 * db: blocks written from mark until now
3630 * rt: remaining time
3631 */
3632 dt = ((jiffies - mddev->resync_mark) / HZ);
3633 if (!dt) dt++;
3634 db = resync - (mddev->resync_mark_cnt/2);
3635 rt = (dt * ((max_blocks-resync) / (db/100+1)))/100;
3636
3637 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
3638
3639 seq_printf(seq, " speed=%ldK/sec", db/dt);
3640}
3641
3642static void *md_seq_start(struct seq_file *seq, loff_t *pos)
3643{
3644 struct list_head *tmp;
3645 loff_t l = *pos;
3646 mddev_t *mddev;
3647
3648 if (l >= 0x10000)
3649 return NULL;
3650 if (!l--)
3651 /* header */
3652 return (void*)1;
3653
3654 spin_lock(&all_mddevs_lock);
3655 list_for_each(tmp,&all_mddevs)
3656 if (!l--) {
3657 mddev = list_entry(tmp, mddev_t, all_mddevs);
3658 mddev_get(mddev);
3659 spin_unlock(&all_mddevs_lock);
3660 return mddev;
3661 }
3662 spin_unlock(&all_mddevs_lock);
3663 if (!l--)
3664 return (void*)2;/* tail */
3665 return NULL;
3666}
3667
3668static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3669{
3670 struct list_head *tmp;
3671 mddev_t *next_mddev, *mddev = v;
3672
3673 ++*pos;
3674 if (v == (void*)2)
3675 return NULL;
3676
3677 spin_lock(&all_mddevs_lock);
3678 if (v == (void*)1)
3679 tmp = all_mddevs.next;
3680 else
3681 tmp = mddev->all_mddevs.next;
3682 if (tmp != &all_mddevs)
3683 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
3684 else {
3685 next_mddev = (void*)2;
3686 *pos = 0x10000;
3687 }
3688 spin_unlock(&all_mddevs_lock);
3689
3690 if (v != (void*)1)
3691 mddev_put(mddev);
3692 return next_mddev;
3693
3694}
3695
3696static void md_seq_stop(struct seq_file *seq, void *v)
3697{
3698 mddev_t *mddev = v;
3699
3700 if (mddev && v != (void*)1 && v != (void*)2)
3701 mddev_put(mddev);
3702}
3703
d7603b7e
N		 3704struct mdstat_info {
3705 int event;
3706};
3707
1da177e4
LT		 3708static int md_seq_show(struct seq_file *seq, void *v)
3709{
3710 mddev_t *mddev = v;
3711 sector_t size;
3712 struct list_head *tmp2;
3713 mdk_rdev_t *rdev;
d7603b7e 3714 struct mdstat_info *mi = seq->private;
32a7627c 3715 struct bitmap *bitmap;
1da177e4
LT		 3716
3717 if (v == (void*)1) {
2604b703 3718 struct mdk_personality *pers;
1da177e4
LT		 3719 seq_printf(seq, "Personalities : ");
3720 spin_lock(&pers_lock);
2604b703
N		 3721 list_for_each_entry(pers, &pers_list, list)
3722 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT		 3723
3724 spin_unlock(&pers_lock);
3725 seq_printf(seq, "\n");
d7603b7e 3726 mi->event = atomic_read(&md_event_count);
1da177e4
LT		 3727 return 0;
3728 }
3729 if (v == (void*)2) {
3730 status_unused(seq);
3731 return 0;
3732 }
3733
3734 if (mddev_lock(mddev)!=0)
3735 return -EINTR;
3736 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
3737 seq_printf(seq, "%s : %sactive", mdname(mddev),
3738 mddev->pers ? "" : "in");
3739 if (mddev->pers) {
f91de92e 3740 if (mddev->ro==1)
1da177e4 3741 seq_printf(seq, " (read-only)");
f91de92e
N		 3742 if (mddev->ro==2)
3743 seq_printf(seq, "(auto-read-only)");
1da177e4
LT		 3744 seq_printf(seq, " %s", mddev->pers->name);
3745 }
3746
3747 size = 0;
3748 ITERATE_RDEV(mddev,rdev,tmp2) {
3749 char b[BDEVNAME_SIZE];
3750 seq_printf(seq, " %s[%d]",
3751 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 3752 if (test_bit(WriteMostly, &rdev->flags))
3753 seq_printf(seq, "(W)");
b2d444d7 3754 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 3755 seq_printf(seq, "(F)");
3756 continue;
b325a32e
N		 3757 } else if (rdev->raid_disk < 0)
3758 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 3759 size += rdev->size;
3760 }
3761
3762 if (!list_empty(&mddev->disks)) {
3763 if (mddev->pers)
3764 seq_printf(seq, "\n %llu blocks",
3765 (unsigned long long)mddev->array_size);
3766 else
3767 seq_printf(seq, "\n %llu blocks",
3768 (unsigned long long)size);
3769 }
1cd6bf19
N		 3770 if (mddev->persistent) {
3771 if (mddev->major_version != 0 ||
3772 mddev->minor_version != 90) {
3773 seq_printf(seq," super %d.%d",
3774 mddev->major_version,
3775 mddev->minor_version);
3776 }
3777 } else
3778 seq_printf(seq, " super non-persistent");
1da177e4
LT		 3779
3780 if (mddev->pers) {
3781 mddev->pers->status (seq, mddev);
3782 seq_printf(seq, "\n ");
8e1b39d6
N		 3783 if (mddev->pers->sync_request) {
3784 if (mddev->curr_resync > 2) {
3785 status_resync (seq, mddev);
3786 seq_printf(seq, "\n ");
3787 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
3788 seq_printf(seq, "\tresync=DELAYED\n ");
3789 else if (mddev->recovery_cp < MaxSector)
3790 seq_printf(seq, "\tresync=PENDING\n ");
3791 }
32a7627c
N		 3792 } else
3793 seq_printf(seq, "\n ");
3794
3795 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 3796 unsigned long chunk_kb;
3797 unsigned long flags;
32a7627c
N		 3798 spin_lock_irqsave(&bitmap->lock, flags);
3799 chunk_kb = bitmap->chunksize >> 10;
3800 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
3801 "%lu%s chunk",
3802 bitmap->pages - bitmap->missing_pages,
3803 bitmap->pages,
3804 (bitmap->pages - bitmap->missing_pages)
3805 << (PAGE_SHIFT - 10),
3806 chunk_kb ? chunk_kb : bitmap->chunksize,
3807 chunk_kb ? "KB" : "B");
78d742d8
N		 3808 if (bitmap->file) {
3809 seq_printf(seq, ", file: ");
3810 seq_path(seq, bitmap->file->f_vfsmnt,
3811 bitmap->file->f_dentry," \t\n");
32a7627c 3812 }
78d742d8 3813
32a7627c
N		 3814 seq_printf(seq, "\n");
3815 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 3816 }
3817
3818 seq_printf(seq, "\n");
3819 }
3820 mddev_unlock(mddev);
3821
3822 return 0;
3823}
3824
3825static struct seq_operations md_seq_ops = {
3826 .start = md_seq_start,
3827 .next = md_seq_next,
3828 .stop = md_seq_stop,
3829 .show = md_seq_show,
3830};
3831
3832static int md_seq_open(struct inode *inode, struct file *file)
3833{
3834 int error;
d7603b7e
N		 3835 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
3836 if (mi == NULL)
3837 return -ENOMEM;
1da177e4
LT		 3838
3839 error = seq_open(file, &md_seq_ops);
d7603b7e
N		 3840 if (error)
3841 kfree(mi);
3842 else {
3843 struct seq_file *p = file->private_data;
3844 p->private = mi;
3845 mi->event = atomic_read(&md_event_count);
3846 }
1da177e4
LT		 3847 return error;
3848}
3849
d7603b7e
N		 3850static int md_seq_release(struct inode *inode, struct file *file)
3851{
3852 struct seq_file *m = file->private_data;
3853 struct mdstat_info *mi = m->private;
3854 m->private = NULL;
3855 kfree(mi);
3856 return seq_release(inode, file);
3857}
3858
3859static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
3860{
3861 struct seq_file *m = filp->private_data;
3862 struct mdstat_info *mi = m->private;
3863 int mask;
3864
3865 poll_wait(filp, &md_event_waiters, wait);
3866
3867 /* always allow read */
3868 mask = POLLIN | POLLRDNORM;
3869
3870 if (mi->event != atomic_read(&md_event_count))
3871 mask |= POLLERR | POLLPRI;
3872 return mask;
3873}
3874
1da177e4
LT		 3875static struct file_operations md_seq_fops = {
3876 .open = md_seq_open,
3877 .read = seq_read,
3878 .llseek = seq_lseek,
d7603b7e
N		 3879 .release = md_seq_release,
3880 .poll = mdstat_poll,
1da177e4
LT		 3881};
3882
2604b703 3883int register_md_personality(struct mdk_personality *p)
1da177e4 3884{
1da177e4 3885 spin_lock(&pers_lock);
2604b703
N		 3886 list_add_tail(&p->list, &pers_list);
3887 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
1da177e4
LT		 3888 spin_unlock(&pers_lock);
3889 return 0;
3890}
3891
2604b703 3892int unregister_md_personality(struct mdk_personality *p)
1da177e4 3893{
2604b703 3894 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 3895 spin_lock(&pers_lock);
2604b703 3896 list_del_init(&p->list);
1da177e4
LT		 3897 spin_unlock(&pers_lock);
3898 return 0;
3899}
3900
3901static int is_mddev_idle(mddev_t *mddev)
3902{
3903 mdk_rdev_t * rdev;
3904 struct list_head *tmp;
3905 int idle;
3906 unsigned long curr_events;
3907
3908 idle = 1;
3909 ITERATE_RDEV(mddev,rdev,tmp) {
3910 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 3911 curr_events = disk_stat_read(disk, sectors[0]) +
3912 disk_stat_read(disk, sectors[1]) -
1da177e4 3913 atomic_read(&disk->sync_io);
c0e48521
N		 3914 /* The difference between curr_events and last_events
3915 * will be affected by any new non-sync IO (making
3916 * curr_events bigger) and any difference in the amount of
3917 * in-flight syncio (making current_events bigger or smaller)
3918 * The amount in-flight is currently limited to
3919 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
3920 * which is at most 4096 sectors.
3921 * These numbers are fairly fragile and should be made
3922 * more robust, probably by enforcing the
3923 * 'window size' that md_do_sync sort-of uses.
3924 *
1da177e4
LT		 3925 * Note: the following is an unsigned comparison.
3926 */
c0e48521 3927 if ((curr_events - rdev->last_events + 4096) > 8192) {
1da177e4
LT		 3928 rdev->last_events = curr_events;
3929 idle = 0;
3930 }
3931 }
3932 return idle;
3933}
3934
3935void md_done_sync(mddev_t *mddev, int blocks, int ok)
3936{
3937 /* another "blocks" (512byte) blocks have been synced */
3938 atomic_sub(blocks, &mddev->recovery_active);
3939 wake_up(&mddev->recovery_wait);
3940 if (!ok) {
3941 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
3942 md_wakeup_thread(mddev->thread);
3943 // stop recovery, signal do_sync ....
3944 }
3945}
3946
3947
06d91a5f
N		 3948/* md_write_start(mddev, bi)
3949 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 3950 * in superblock) before writing, schedule a superblock update
3951 * and wait for it to complete.
06d91a5f 3952 */
3d310eb7 3953void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 3954{
06d91a5f 3955 if (bio_data_dir(bi) != WRITE)
3d310eb7 3956 return;
06d91a5f 3957
f91de92e
N		 3958 BUG_ON(mddev->ro == 1);
3959 if (mddev->ro == 2) {
3960 /* need to switch to read/write */
3961 mddev->ro = 0;
3962 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3963 md_wakeup_thread(mddev->thread);
3964 }
06d91a5f 3965 atomic_inc(&mddev->writes_pending);
06d91a5f 3966 if (mddev->in_sync) {
a9701a30 3967 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 3968 if (mddev->in_sync) {
3969 mddev->in_sync = 0;
3970 mddev->sb_dirty = 1;
3971 md_wakeup_thread(mddev->thread);
3972 }
a9701a30 3973 spin_unlock_irq(&mddev->write_lock);
06d91a5f 3974 }
3d310eb7 3975 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
1da177e4
LT		 3976}
3977
3978void md_write_end(mddev_t *mddev)
3979{
3980 if (atomic_dec_and_test(&mddev->writes_pending)) {
3981 if (mddev->safemode == 2)
3982 md_wakeup_thread(mddev->thread);
3983 else
3984 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
3985 }
3986}
3987
75c96f85 3988static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
1da177e4
LT		 3989
3990#define SYNC_MARKS 10
3991#define SYNC_MARK_STEP (3*HZ)
3992static void md_do_sync(mddev_t *mddev)
3993{
3994 mddev_t *mddev2;
3995 unsigned int currspeed = 0,
3996 window;
57afd89f 3997 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 3998 unsigned long mark[SYNC_MARKS];
3999 sector_t mark_cnt[SYNC_MARKS];
4000 int last_mark,m;
4001 struct list_head *tmp;
4002 sector_t last_check;
57afd89f 4003 int skipped = 0;
1da177e4
LT		 4004
4005 /* just incase thread restarts... */
4006 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
4007 return;
4008
4009 /* we overload curr_resync somewhat here.
4010 * 0 == not engaged in resync at all
4011 * 2 == checking that there is no conflict with another sync
4012 * 1 == like 2, but have yielded to allow conflicting resync to
4013 * commense
4014 * other == active in resync - this many blocks
4015 *
4016 * Before starting a resync we must have set curr_resync to
4017 * 2, and then checked that every "conflicting" array has curr_resync
4018 * less than ours. When we find one that is the same or higher
4019 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
4020 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
4021 * This will mean we have to start checking from the beginning again.
4022 *
4023 */
4024
4025 do {
4026 mddev->curr_resync = 2;
4027
4028 try_again:
787453c2 4029 if (kthread_should_stop()) {
6985c43f 4030 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 4031 goto skip;
4032 }
4033 ITERATE_MDDEV(mddev2,tmp) {
1da177e4
LT		 4034 if (mddev2 == mddev)
4035 continue;
4036 if (mddev2->curr_resync &&
4037 match_mddev_units(mddev,mddev2)) {
4038 DEFINE_WAIT(wq);
4039 if (mddev < mddev2 && mddev->curr_resync == 2) {
4040 /* arbitrarily yield */
4041 mddev->curr_resync = 1;
4042 wake_up(&resync_wait);
4043 }
4044 if (mddev > mddev2 && mddev->curr_resync == 1)
4045 /* no need to wait here, we can wait the next
4046 * time 'round when curr_resync == 2
4047 */
4048 continue;
787453c2
N		 4049 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
4050 if (!kthread_should_stop() &&
8712e553 4051 mddev2->curr_resync >= mddev->curr_resync) {
1da177e4
LT		 4052 printk(KERN_INFO "md: delaying resync of %s"
4053 " until %s has finished resync (they"
4054 " share one or more physical units)\n",
4055 mdname(mddev), mdname(mddev2));
4056 mddev_put(mddev2);
4057 schedule();
4058 finish_wait(&resync_wait, &wq);
4059 goto try_again;
4060 }
4061 finish_wait(&resync_wait, &wq);
4062 }
4063 }
4064 } while (mddev->curr_resync < 2);
4065
9d88883e 4066 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 4067 /* resync follows the size requested by the personality,
57afd89f 4068 * which defaults to physical size, but can be virtual size
1da177e4
LT		 4069 */
4070 max_sectors = mddev->resync_max_sectors;
9d88883e
N		 4071 mddev->resync_mismatches = 0;
4072 } else
1da177e4
LT		 4073 /* recovery follows the physical size of devices */
4074 max_sectors = mddev->size << 1;
4075
4076 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
4077 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
4078 " %d KB/sec/disc.\n", sysctl_speed_limit_min);
338cec32 4079 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
1da177e4
LT		 4080 "(but not more than %d KB/sec) for reconstruction.\n",
4081 sysctl_speed_limit_max);
4082
4083 is_mddev_idle(mddev); /* this also initializes IO event counters */
32a7627c 4084 /* we don't use the checkpoint if there's a bitmap */
24dd469d
N		 4085 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap
4086 && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
1da177e4
LT		 4087 j = mddev->recovery_cp;
4088 else
4089 j = 0;
57afd89f 4090 io_sectors = 0;
1da177e4
LT		 4091 for (m = 0; m < SYNC_MARKS; m++) {
4092 mark[m] = jiffies;
57afd89f 4093 mark_cnt[m] = io_sectors;
1da177e4
LT		 4094 }
4095 last_mark = 0;
4096 mddev->resync_mark = mark[last_mark];
4097 mddev->resync_mark_cnt = mark_cnt[last_mark];
4098
4099 /*
4100 * Tune reconstruction:
4101 */
4102 window = 32*(PAGE_SIZE/512);
4103 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
4104 window/2,(unsigned long long) max_sectors/2);
4105
4106 atomic_set(&mddev->recovery_active, 0);
4107 init_waitqueue_head(&mddev->recovery_wait);
4108 last_check = 0;
4109
4110 if (j>2) {
4111 printk(KERN_INFO
4112 "md: resuming recovery of %s from checkpoint.\n",
4113 mdname(mddev));
4114 mddev->curr_resync = j;
4115 }
4116
4117 while (j < max_sectors) {
57afd89f 4118 sector_t sectors;
1da177e4 4119
57afd89f
N		 4120 skipped = 0;
4121 sectors = mddev->pers->sync_request(mddev, j, &skipped,
4122 currspeed < sysctl_speed_limit_min);
4123 if (sectors == 0) {
1da177e4
LT		 4124 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4125 goto out;
4126 }
57afd89f
N		 4127
4128 if (!skipped) { /* actual IO requested */
4129 io_sectors += sectors;
4130 atomic_add(sectors, &mddev->recovery_active);
4131 }
4132
1da177e4
LT		 4133 j += sectors;
4134 if (j>1) mddev->curr_resync = j;
d7603b7e
N		 4135 if (last_check == 0)
4136 /* this is the earliers that rebuilt will be
4137 * visible in /proc/mdstat
4138 */
4139 md_new_event(mddev);
57afd89f
N		 4140
4141 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 4142 continue;
4143
57afd89f 4144 last_check = io_sectors;
1da177e4
LT		 4145
4146 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
4147 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
4148 break;
4149
4150 repeat:
4151 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
4152 /* step marks */
4153 int next = (last_mark+1) % SYNC_MARKS;
4154
4155 mddev->resync_mark = mark[next];
4156 mddev->resync_mark_cnt = mark_cnt[next];
4157 mark[next] = jiffies;
57afd89f 4158 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 4159 last_mark = next;
4160 }
4161
4162
787453c2 4163 if (kthread_should_stop()) {
1da177e4
LT		 4164 /*
4165 * got a signal, exit.
4166 */
4167 printk(KERN_INFO
4168 "md: md_do_sync() got signal ... exiting\n");
1da177e4
LT		 4169 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4170 goto out;
4171 }
4172
4173 /*
4174 * this loop exits only if either when we are slower than
4175 * the 'hard' speed limit, or the system was IO-idle for
4176 * a jiffy.
4177 * the system might be non-idle CPU-wise, but we only care
4178 * about not overloading the IO subsystem. (things like an
4179 * e2fsck being done on the RAID array should execute fast)
4180 */
4181 mddev->queue->unplug_fn(mddev->queue);
4182 cond_resched();
4183
57afd89f
N		 4184 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
4185 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4
LT		 4186
4187 if (currspeed > sysctl_speed_limit_min) {
4188 if ((currspeed > sysctl_speed_limit_max) ||
4189 !is_mddev_idle(mddev)) {
c0e48521 4190 msleep(500);
1da177e4
LT		 4191 goto repeat;
4192 }
4193 }
4194 }
4195 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
4196 /*
4197 * this also signals 'finished resyncing' to md_stop
4198 */
4199 out:
4200 mddev->queue->unplug_fn(mddev->queue);
4201
4202 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
4203
4204 /* tell personality that we are finished */
57afd89f 4205 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 4206
4207 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4208 mddev->curr_resync > 2 &&
4209 mddev->curr_resync >= mddev->recovery_cp) {
4210 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4211 printk(KERN_INFO
4212 "md: checkpointing recovery of %s.\n",
4213 mdname(mddev));
4214 mddev->recovery_cp = mddev->curr_resync;
4215 } else
4216 mddev->recovery_cp = MaxSector;
4217 }
4218
1da177e4
LT		 4219 skip:
4220 mddev->curr_resync = 0;
4221 wake_up(&resync_wait);
4222 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
4223 md_wakeup_thread(mddev->thread);
4224}
4225
4226
4227/*
4228 * This routine is regularly called by all per-raid-array threads to
4229 * deal with generic issues like resync and super-block update.
4230 * Raid personalities that don't have a thread (linear/raid0) do not
4231 * need this as they never do any recovery or update the superblock.
4232 *
4233 * It does not do any resync itself, but rather "forks" off other threads
4234 * to do that as needed.
4235 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4236 * "->recovery" and create a thread at ->sync_thread.
4237 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4238 * and wakeups up this thread which will reap the thread and finish up.
4239 * This thread also removes any faulty devices (with nr_pending == 0).
4240 *
4241 * The overall approach is:
4242 * 1/ if the superblock needs updating, update it.
4243 * 2/ If a recovery thread is running, don't do anything else.
4244 * 3/ If recovery has finished, clean up, possibly marking spares active.
4245 * 4/ If there are any faulty devices, remove them.
4246 * 5/ If array is degraded, try to add spares devices
4247 * 6/ If array has spares or is not in-sync, start a resync thread.
4248 */
4249void md_check_recovery(mddev_t *mddev)
4250{
4251 mdk_rdev_t *rdev;
4252 struct list_head *rtmp;
4253
4254
5f40402d
N		 4255 if (mddev->bitmap)
4256 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 4257
4258 if (mddev->ro)
4259 return;
fca4d848
N		 4260
4261 if (signal_pending(current)) {
4262 if (mddev->pers->sync_request) {
4263 printk(KERN_INFO "md: %s in immediate safe mode\n",
4264 mdname(mddev));
4265 mddev->safemode = 2;
4266 }
4267 flush_signals(current);
4268 }
4269
1da177e4
LT		 4270 if ( ! (
4271 mddev->sb_dirty ||
4272 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848
N		 4273 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
4274 (mddev->safemode == 1) ||
4275 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
4276 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 4277 ))
4278 return;
fca4d848 4279
1da177e4
LT		 4280 if (mddev_trylock(mddev)==0) {
4281 int spares =0;
fca4d848 4282
a9701a30 4283 spin_lock_irq(&mddev->write_lock);
fca4d848
N		 4284 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
4285 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
4286 mddev->in_sync = 1;
4287 mddev->sb_dirty = 1;
4288 }
4289 if (mddev->safemode == 1)
4290 mddev->safemode = 0;
a9701a30 4291 spin_unlock_irq(&mddev->write_lock);
fca4d848 4292
1da177e4
LT		 4293 if (mddev->sb_dirty)
4294 md_update_sb(mddev);
06d91a5f 4295
06d91a5f 4296
1da177e4
LT		 4297 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4298 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
4299 /* resync/recovery still happening */
4300 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4301 goto unlock;
4302 }
4303 if (mddev->sync_thread) {
4304 /* resync has finished, collect result */
4305 md_unregister_thread(mddev->sync_thread);
4306 mddev->sync_thread = NULL;
4307 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4308 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4309 /* success...*/
4310 /* activate any spares */
4311 mddev->pers->spare_active(mddev);
4312 }
4313 md_update_sb(mddev);
41158c7e
N		 4314
4315 /* if array is no-longer degraded, then any saved_raid_disk
4316 * information must be scrapped
4317 */
4318 if (!mddev->degraded)
4319 ITERATE_RDEV(mddev,rdev,rtmp)
4320 rdev->saved_raid_disk = -1;
4321
1da177e4
LT		 4322 mddev->recovery = 0;
4323 /* flag recovery needed just to double check */
4324 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
d7603b7e 4325 md_new_event(mddev);
1da177e4
LT		 4326 goto unlock;
4327 }
24dd469d
N		 4328 /* Clear some bits that don't mean anything, but
4329 * might be left set
4330 */
4331 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4332 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
4333 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
4334 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4
LT		 4335
4336 /* no recovery is running.
4337 * remove any failed drives, then
4338 * add spares if possible.
4339 * Spare are also removed and re-added, to allow
4340 * the personality to fail the re-add.
4341 */
4342 ITERATE_RDEV(mddev,rdev,rtmp)
4343 if (rdev->raid_disk >= 0 &&
b2d444d7 4344 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
1da177e4 4345 atomic_read(&rdev->nr_pending)==0) {
86e6ffdd
N		 4346 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
4347 char nm[20];
4348 sprintf(nm,"rd%d", rdev->raid_disk);
4349 sysfs_remove_link(&mddev->kobj, nm);
1da177e4 4350 rdev->raid_disk = -1;
86e6ffdd 4351 }
1da177e4
LT		 4352 }
4353
4354 if (mddev->degraded) {
4355 ITERATE_RDEV(mddev,rdev,rtmp)
4356 if (rdev->raid_disk < 0
b2d444d7 4357 && !test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 4358 if (mddev->pers->hot_add_disk(mddev,rdev)) {
4359 char nm[20];
4360 sprintf(nm, "rd%d", rdev->raid_disk);
4361 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
1da177e4 4362 spares++;
d7603b7e 4363 md_new_event(mddev);
86e6ffdd 4364 } else
1da177e4
LT		 4365 break;
4366 }
4367 }
4368
24dd469d
N		 4369 if (spares) {
4370 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4371 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4372 } else if (mddev->recovery_cp < MaxSector) {
4373 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4374 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4375 /* nothing to be done ... */
1da177e4 4376 goto unlock;
24dd469d 4377
1da177e4
LT		 4378 if (mddev->pers->sync_request) {
4379 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 4380 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
4381 /* We are adding a device or devices to an array
4382 * which has the bitmap stored on all devices.
4383 * So make sure all bitmap pages get written
4384 */
4385 bitmap_write_all(mddev->bitmap);
4386 }
1da177e4
LT		 4387 mddev->sync_thread = md_register_thread(md_do_sync,
4388 mddev,
4389 "%s_resync");
4390 if (!mddev->sync_thread) {
4391 printk(KERN_ERR "%s: could not start resync"
4392 " thread...\n",
4393 mdname(mddev));
4394 /* leave the spares where they are, it shouldn't hurt */
4395 mddev->recovery = 0;
d7603b7e 4396 } else
1da177e4 4397 md_wakeup_thread(mddev->sync_thread);
d7603b7e 4398 md_new_event(mddev);
1da177e4
LT		 4399 }
4400 unlock:
4401 mddev_unlock(mddev);
4402 }
4403}
4404
75c96f85
AB		 4405static int md_notify_reboot(struct notifier_block *this,
4406 unsigned long code, void *x)
1da177e4
LT		 4407{
4408 struct list_head *tmp;
4409 mddev_t *mddev;
4410
4411 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
4412
4413 printk(KERN_INFO "md: stopping all md devices.\n");
4414
4415 ITERATE_MDDEV(mddev,tmp)
4416 if (mddev_trylock(mddev)==0)
4417 do_md_stop (mddev, 1);
4418 /*
4419 * certain more exotic SCSI devices are known to be
4420 * volatile wrt too early system reboots. While the
4421 * right place to handle this issue is the given
4422 * driver, we do want to have a safe RAID driver ...
4423 */
4424 mdelay(1000*1);
4425 }
4426 return NOTIFY_DONE;
4427}
4428
75c96f85 4429static struct notifier_block md_notifier = {
1da177e4
LT		 4430 .notifier_call = md_notify_reboot,
4431 .next = NULL,
4432 .priority = INT_MAX, /* before any real devices */
4433};
4434
4435static void md_geninit(void)
4436{
4437 struct proc_dir_entry *p;
4438
4439 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
4440
4441 p = create_proc_entry("mdstat", S_IRUGO, NULL);
4442 if (p)
4443 p->proc_fops = &md_seq_fops;
4444}
4445
75c96f85 4446static int __init md_init(void)
1da177e4
LT		 4447{
4448 int minor;
4449
4450 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4451 " MD_SB_DISKS=%d\n",
4452 MD_MAJOR_VERSION, MD_MINOR_VERSION,
4453 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
bd926c63 4454 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
32a7627c 4455 BITMAP_MINOR);
1da177e4
LT		 4456
4457 if (register_blkdev(MAJOR_NR, "md"))
4458 return -1;
4459 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
4460 unregister_blkdev(MAJOR_NR, "md");
4461 return -1;
4462 }
4463 devfs_mk_dir("md");
4464 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
4465 md_probe, NULL, NULL);
4466 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
4467 md_probe, NULL, NULL);
4468
4469 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4470 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
4471 S_IFBLK|S_IRUSR|S_IWUSR,
4472 "md/%d", minor);
4473
4474 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4475 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
4476 S_IFBLK|S_IRUSR|S_IWUSR,
4477 "md/mdp%d", minor);
4478
4479
4480 register_reboot_notifier(&md_notifier);
4481 raid_table_header = register_sysctl_table(raid_root_table, 1);
4482
4483 md_geninit();
4484 return (0);
4485}
4486
4487
4488#ifndef MODULE
4489
4490/*
4491 * Searches all registered partitions for autorun RAID arrays
4492 * at boot time.
4493 */
4494static dev_t detected_devices[128];
4495static int dev_cnt;
4496
4497void md_autodetect_dev(dev_t dev)
4498{
4499 if (dev_cnt >= 0 && dev_cnt < 127)
4500 detected_devices[dev_cnt++] = dev;
4501}
4502
4503
4504static void autostart_arrays(int part)
4505{
4506 mdk_rdev_t *rdev;
4507 int i;
4508
4509 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
4510
4511 for (i = 0; i < dev_cnt; i++) {
4512 dev_t dev = detected_devices[i];
4513
4514 rdev = md_import_device(dev,0, 0);
4515 if (IS_ERR(rdev))
4516 continue;
4517
b2d444d7 4518 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4519 MD_BUG();
4520 continue;
4521 }
4522 list_add(&rdev->same_set, &pending_raid_disks);
4523 }
4524 dev_cnt = 0;
4525
4526 autorun_devices(part);
4527}
4528
4529#endif
4530
4531static __exit void md_exit(void)
4532{
4533 mddev_t *mddev;
4534 struct list_head *tmp;
4535 int i;
4536 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
4537 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
4538 for (i=0; i < MAX_MD_DEVS; i++)
4539 devfs_remove("md/%d", i);
4540 for (i=0; i < MAX_MD_DEVS; i++)
4541 devfs_remove("md/d%d", i);
4542
4543 devfs_remove("md");
4544
4545 unregister_blkdev(MAJOR_NR,"md");
4546 unregister_blkdev(mdp_major, "mdp");
4547 unregister_reboot_notifier(&md_notifier);
4548 unregister_sysctl_table(raid_table_header);
4549 remove_proc_entry("mdstat", NULL);
4550 ITERATE_MDDEV(mddev,tmp) {
4551 struct gendisk *disk = mddev->gendisk;
4552 if (!disk)
4553 continue;
4554 export_array(mddev);
4555 del_gendisk(disk);
4556 put_disk(disk);
4557 mddev->gendisk = NULL;
4558 mddev_put(mddev);
4559 }
4560}
4561
4562module_init(md_init)
4563module_exit(md_exit)
4564
f91de92e
N		 4565static int get_ro(char *buffer, struct kernel_param *kp)
4566{
4567 return sprintf(buffer, "%d", start_readonly);
4568}
4569static int set_ro(const char *val, struct kernel_param *kp)
4570{
4571 char *e;
4572 int num = simple_strtoul(val, &e, 10);
4573 if (*val && (*e == '\0' || *e == '\n')) {
4574 start_readonly = num;
4575 return 0;;
4576 }
4577 return -EINVAL;
4578}
4579
4580module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
6ff8d8ec
N		 4581module_param(start_dirty_degraded, int, 0644);
4582
f91de92e 4583
1da177e4
LT		 4584EXPORT_SYMBOL(register_md_personality);
4585EXPORT_SYMBOL(unregister_md_personality);
4586EXPORT_SYMBOL(md_error);
4587EXPORT_SYMBOL(md_done_sync);
4588EXPORT_SYMBOL(md_write_start);
4589EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 4590EXPORT_SYMBOL(md_register_thread);
4591EXPORT_SYMBOL(md_unregister_thread);
4592EXPORT_SYMBOL(md_wakeup_thread);
4593EXPORT_SYMBOL(md_print_devices);
4594EXPORT_SYMBOL(md_check_recovery);
4595MODULE_LICENSE("GPL");
aa1595e9 4596MODULE_ALIAS("md");
72008652 4597MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
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