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[PATCH] md: make sure bitmap updates are visible through filesystem
[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 }
1829 return len;
1830 }
31399d9e
N		 1831
1832 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
1833 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 1834 return -EBUSY;
bce74dac 1835 if (cmd_match(page, "resync") || cmd_match(page, "recover"))
7eec314d
N		 1836 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
1837 else {
bce74dac 1838 if (cmd_match(page, "check"))
7eec314d 1839 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
bce74dac 1840 else if (cmd_match(page, "repair"))
7eec314d
N		 1841 return -EINVAL;
1842 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
1843 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
1844 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
1845 }
24dd469d
N		 1846 md_wakeup_thread(mddev->thread);
1847 return len;
1848}
1849
9d88883e 1850static ssize_t
96de1e66 1851mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 1852{
1853 return sprintf(page, "%llu\n",
1854 (unsigned long long) mddev->resync_mismatches);
1855}
1856
96de1e66 1857static struct md_sysfs_entry
7eec314d 1858md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 1859
96de1e66
N		 1860
1861static struct md_sysfs_entry
1862md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 1863
eae1701f
N		 1864static struct attribute *md_default_attrs[] = {
1865 &md_level.attr,
1866 &md_raid_disks.attr,
411036fa
N		 1867 NULL,
1868};
1869
1870static struct attribute *md_redundancy_attrs[] = {
24dd469d 1871 &md_scan_mode.attr,
9d88883e 1872 &md_mismatches.attr,
eae1701f
N		 1873 NULL,
1874};
411036fa
N		 1875static struct attribute_group md_redundancy_group = {
1876 .name = NULL,
1877 .attrs = md_redundancy_attrs,
1878};
1879
eae1701f
N		 1880
1881static ssize_t
1882md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1883{
1884 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
1885 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 1886 ssize_t rv;
eae1701f
N		 1887
1888 if (!entry->show)
1889 return -EIO;
96de1e66
N		 1890 mddev_lock(mddev);
1891 rv = entry->show(mddev, page);
1892 mddev_unlock(mddev);
1893 return rv;
eae1701f
N		 1894}
1895
1896static ssize_t
1897md_attr_store(struct kobject *kobj, struct attribute *attr,
1898 const char *page, size_t length)
1899{
1900 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
1901 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 1902 ssize_t rv;
eae1701f
N		 1903
1904 if (!entry->store)
1905 return -EIO;
96de1e66
N		 1906 mddev_lock(mddev);
1907 rv = entry->store(mddev, page, length);
1908 mddev_unlock(mddev);
1909 return rv;
eae1701f
N		 1910}
1911
1912static void md_free(struct kobject *ko)
1913{
1914 mddev_t *mddev = container_of(ko, mddev_t, kobj);
1915 kfree(mddev);
1916}
1917
1918static struct sysfs_ops md_sysfs_ops = {
1919 .show = md_attr_show,
1920 .store = md_attr_store,
1921};
1922static struct kobj_type md_ktype = {
1923 .release = md_free,
1924 .sysfs_ops = &md_sysfs_ops,
1925 .default_attrs = md_default_attrs,
1926};
1927
1da177e4
LT		 1928int mdp_major = 0;
1929
1930static struct kobject *md_probe(dev_t dev, int *part, void *data)
1931{
1932 static DECLARE_MUTEX(disks_sem);
1933 mddev_t *mddev = mddev_find(dev);
1934 struct gendisk *disk;
1935 int partitioned = (MAJOR(dev) != MD_MAJOR);
1936 int shift = partitioned ? MdpMinorShift : 0;
1937 int unit = MINOR(dev) >> shift;
1938
1939 if (!mddev)
1940 return NULL;
1941
1942 down(&disks_sem);
1943 if (mddev->gendisk) {
1944 up(&disks_sem);
1945 mddev_put(mddev);
1946 return NULL;
1947 }
1948 disk = alloc_disk(1 << shift);
1949 if (!disk) {
1950 up(&disks_sem);
1951 mddev_put(mddev);
1952 return NULL;
1953 }
1954 disk->major = MAJOR(dev);
1955 disk->first_minor = unit << shift;
1956 if (partitioned) {
1957 sprintf(disk->disk_name, "md_d%d", unit);
1958 sprintf(disk->devfs_name, "md/d%d", unit);
1959 } else {
1960 sprintf(disk->disk_name, "md%d", unit);
1961 sprintf(disk->devfs_name, "md/%d", unit);
1962 }
1963 disk->fops = &md_fops;
1964 disk->private_data = mddev;
1965 disk->queue = mddev->queue;
1966 add_disk(disk);
1967 mddev->gendisk = disk;
1968 up(&disks_sem);
9c791977 1969 mddev->kobj.parent = &disk->kobj;
eae1701f
N		 1970 mddev->kobj.k_name = NULL;
1971 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
1972 mddev->kobj.ktype = &md_ktype;
1973 kobject_register(&mddev->kobj);
1da177e4
LT		 1974 return NULL;
1975}
1976
1977void md_wakeup_thread(mdk_thread_t *thread);
1978
1979static void md_safemode_timeout(unsigned long data)
1980{
1981 mddev_t *mddev = (mddev_t *) data;
1982
1983 mddev->safemode = 1;
1984 md_wakeup_thread(mddev->thread);
1985}
1986
6ff8d8ec 1987static int start_dirty_degraded;
1da177e4
LT		 1988
1989static int do_md_run(mddev_t * mddev)
1990{
2604b703 1991 int err;
1da177e4
LT		 1992 int chunk_size;
1993 struct list_head *tmp;
1994 mdk_rdev_t *rdev;
1995 struct gendisk *disk;
2604b703 1996 struct mdk_personality *pers;
1da177e4
LT		 1997 char b[BDEVNAME_SIZE];
1998
a757e64c
N		 1999 if (list_empty(&mddev->disks))
2000 /* cannot run an array with no devices.. */
1da177e4 2001 return -EINVAL;
1da177e4
LT		 2002
2003 if (mddev->pers)
2004 return -EBUSY;
2005
2006 /*
2007 * Analyze all RAID superblock(s)
2008 */
a757e64c
N		 2009 if (!mddev->raid_disks)
2010 analyze_sbs(mddev);
1da177e4
LT		 2011
2012 chunk_size = mddev->chunk_size;
2604b703
N		 2013
2014 if (chunk_size) {
1da177e4
LT		 2015 if (chunk_size > MAX_CHUNK_SIZE) {
2016 printk(KERN_ERR "too big chunk_size: %d > %d\n",
2017 chunk_size, MAX_CHUNK_SIZE);
2018 return -EINVAL;
2019 }
2020 /*
2021 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2022 */
2023 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 2024 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 2025 return -EINVAL;
2026 }
2027 if (chunk_size < PAGE_SIZE) {
2028 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
2029 chunk_size, PAGE_SIZE);
2030 return -EINVAL;
2031 }
2032
2033 /* devices must have minimum size of one chunk */
2034 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2035 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2036 continue;
2037 if (rdev->size < chunk_size / 1024) {
2038 printk(KERN_WARNING
2039 "md: Dev %s smaller than chunk_size:"
2040 " %lluk < %dk\n",
2041 bdevname(rdev->bdev,b),
2042 (unsigned long long)rdev->size,
2043 chunk_size / 1024);
2044 return -EINVAL;
2045 }
2046 }
2047 }
2048
1da177e4 2049#ifdef CONFIG_KMOD
2604b703 2050 request_module("md-level-%d", mddev->level);
1da177e4
LT		 2051#endif
2052
2053 /*
2054 * Drop all container device buffers, from now on
2055 * the only valid external interface is through the md
2056 * device.
2057 * Also find largest hardsector size
2058 */
2059 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2060 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2061 continue;
2062 sync_blockdev(rdev->bdev);
2063 invalidate_bdev(rdev->bdev, 0);
2064 }
2065
2066 md_probe(mddev->unit, NULL, NULL);
2067 disk = mddev->gendisk;
2068 if (!disk)
2069 return -ENOMEM;
2070
2071 spin_lock(&pers_lock);
2604b703
N		 2072 pers = find_pers(mddev->level);
2073 if (!pers || !try_module_get(pers->owner)) {
1da177e4 2074 spin_unlock(&pers_lock);
2604b703
N		 2075 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
2076 mddev->level);
1da177e4
LT		 2077 return -EINVAL;
2078 }
2604b703 2079 mddev->pers = pers;
1da177e4
LT		 2080 spin_unlock(&pers_lock);
2081
657390d2 2082 mddev->recovery = 0;
1da177e4 2083 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 2084 mddev->barriers_work = 1;
6ff8d8ec 2085 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 2086
f91de92e
N		 2087 if (start_readonly)
2088 mddev->ro = 2; /* read-only, but switch on first write */
2089
b15c2e57
N		 2090 err = mddev->pers->run(mddev);
2091 if (!err && mddev->pers->sync_request) {
2092 err = bitmap_create(mddev);
2093 if (err) {
2094 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
2095 mdname(mddev), err);
2096 mddev->pers->stop(mddev);
2097 }
2098 }
1da177e4
LT		 2099 if (err) {
2100 printk(KERN_ERR "md: pers->run() failed ...\n");
2101 module_put(mddev->pers->owner);
2102 mddev->pers = NULL;
32a7627c
N		 2103 bitmap_destroy(mddev);
2104 return err;
1da177e4 2105 }
411036fa
N		 2106 if (mddev->pers->sync_request)
2107 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
fd9d49ca
N		 2108 else if (mddev->ro == 2) /* auto-readonly not meaningful */
2109 mddev->ro = 0;
2110
1da177e4
LT		 2111 atomic_set(&mddev->writes_pending,0);
2112 mddev->safemode = 0;
2113 mddev->safemode_timer.function = md_safemode_timeout;
2114 mddev->safemode_timer.data = (unsigned long) mddev;
2115 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */
2116 mddev->in_sync = 1;
86e6ffdd
N		 2117
2118 ITERATE_RDEV(mddev,rdev,tmp)
2119 if (rdev->raid_disk >= 0) {
2120 char nm[20];
2121 sprintf(nm, "rd%d", rdev->raid_disk);
2122 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2123 }
1da177e4
LT		 2124
2125 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 2126 md_wakeup_thread(mddev->thread);
1da177e4
LT		 2127
2128 if (mddev->sb_dirty)
2129 md_update_sb(mddev);
2130
2131 set_capacity(disk, mddev->array_size<<1);
2132
2133 /* If we call blk_queue_make_request here, it will
2134 * re-initialise max_sectors etc which may have been
2135 * refined inside -> run. So just set the bits we need to set.
2136 * Most initialisation happended when we called
2137 * blk_queue_make_request(..., md_fail_request)
2138 * earlier.
2139 */
2140 mddev->queue->queuedata = mddev;
2141 mddev->queue->make_request_fn = mddev->pers->make_request;
2142
2143 mddev->changed = 1;
d7603b7e 2144 md_new_event(mddev);
1da177e4
LT		 2145 return 0;
2146}
2147
2148static int restart_array(mddev_t *mddev)
2149{
2150 struct gendisk *disk = mddev->gendisk;
2151 int err;
2152
2153 /*
2154 * Complain if it has no devices
2155 */
2156 err = -ENXIO;
2157 if (list_empty(&mddev->disks))
2158 goto out;
2159
2160 if (mddev->pers) {
2161 err = -EBUSY;
2162 if (!mddev->ro)
2163 goto out;
2164
2165 mddev->safemode = 0;
2166 mddev->ro = 0;
2167 set_disk_ro(disk, 0);
2168
2169 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2170 mdname(mddev));
2171 /*
2172 * Kick recovery or resync if necessary
2173 */
2174 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2175 md_wakeup_thread(mddev->thread);
2176 err = 0;
2177 } else {
2178 printk(KERN_ERR "md: %s has no personality assigned.\n",
2179 mdname(mddev));
2180 err = -EINVAL;
2181 }
2182
2183out:
2184 return err;
2185}
2186
2187static int do_md_stop(mddev_t * mddev, int ro)
2188{
2189 int err = 0;
2190 struct gendisk *disk = mddev->gendisk;
2191
2192 if (mddev->pers) {
2193 if (atomic_read(&mddev->active)>2) {
2194 printk("md: %s still in use.\n",mdname(mddev));
2195 return -EBUSY;
2196 }
2197
2198 if (mddev->sync_thread) {
2199 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2200 md_unregister_thread(mddev->sync_thread);
2201 mddev->sync_thread = NULL;
2202 }
2203
2204 del_timer_sync(&mddev->safemode_timer);
2205
2206 invalidate_partition(disk, 0);
2207
2208 if (ro) {
2209 err = -ENXIO;
f91de92e 2210 if (mddev->ro==1)
1da177e4
LT		 2211 goto out;
2212 mddev->ro = 1;
2213 } else {
6b8b3e8a 2214 bitmap_flush(mddev);
a9701a30 2215 md_super_wait(mddev);
1da177e4
LT		 2216 if (mddev->ro)
2217 set_disk_ro(disk, 0);
2218 blk_queue_make_request(mddev->queue, md_fail_request);
2219 mddev->pers->stop(mddev);
411036fa
N		 2220 if (mddev->pers->sync_request)
2221 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
2222
1da177e4
LT		 2223 module_put(mddev->pers->owner);
2224 mddev->pers = NULL;
2225 if (mddev->ro)
2226 mddev->ro = 0;
2227 }
2228 if (!mddev->in_sync) {
2229 /* mark array as shutdown cleanly */
2230 mddev->in_sync = 1;
2231 md_update_sb(mddev);
2232 }
2233 if (ro)
2234 set_disk_ro(disk, 1);
2235 }
32a7627c
N		 2236
2237 bitmap_destroy(mddev);
2238 if (mddev->bitmap_file) {
2239 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
2240 fput(mddev->bitmap_file);
2241 mddev->bitmap_file = NULL;
2242 }
9223214e 2243 mddev->bitmap_offset = 0;
32a7627c 2244
1da177e4
LT		 2245 /*
2246 * Free resources if final stop
2247 */
2248 if (!ro) {
86e6ffdd
N		 2249 mdk_rdev_t *rdev;
2250 struct list_head *tmp;
1da177e4
LT		 2251 struct gendisk *disk;
2252 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
2253
86e6ffdd
N		 2254 ITERATE_RDEV(mddev,rdev,tmp)
2255 if (rdev->raid_disk >= 0) {
2256 char nm[20];
2257 sprintf(nm, "rd%d", rdev->raid_disk);
2258 sysfs_remove_link(&mddev->kobj, nm);
2259 }
2260
1da177e4
LT		 2261 export_array(mddev);
2262
2263 mddev->array_size = 0;
2264 disk = mddev->gendisk;
2265 if (disk)
2266 set_capacity(disk, 0);
2267 mddev->changed = 1;
2268 } else
2269 printk(KERN_INFO "md: %s switched to read-only mode.\n",
2270 mdname(mddev));
2271 err = 0;
d7603b7e 2272 md_new_event(mddev);
1da177e4
LT		 2273out:
2274 return err;
2275}
2276
2277static void autorun_array(mddev_t *mddev)
2278{
2279 mdk_rdev_t *rdev;
2280 struct list_head *tmp;
2281 int err;
2282
a757e64c 2283 if (list_empty(&mddev->disks))
1da177e4 2284 return;
1da177e4
LT		 2285
2286 printk(KERN_INFO "md: running: ");
2287
2288 ITERATE_RDEV(mddev,rdev,tmp) {
2289 char b[BDEVNAME_SIZE];
2290 printk("<%s>", bdevname(rdev->bdev,b));
2291 }
2292 printk("\n");
2293
2294 err = do_md_run (mddev);
2295 if (err) {
2296 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
2297 do_md_stop (mddev, 0);
2298 }
2299}
2300
2301/*
2302 * lets try to run arrays based on all disks that have arrived
2303 * until now. (those are in pending_raid_disks)
2304 *
2305 * the method: pick the first pending disk, collect all disks with
2306 * the same UUID, remove all from the pending list and put them into
2307 * the 'same_array' list. Then order this list based on superblock
2308 * update time (freshest comes first), kick out 'old' disks and
2309 * compare superblocks. If everything's fine then run it.
2310 *
2311 * If "unit" is allocated, then bump its reference count
2312 */
2313static void autorun_devices(int part)
2314{
2315 struct list_head candidates;
2316 struct list_head *tmp;
2317 mdk_rdev_t *rdev0, *rdev;
2318 mddev_t *mddev;
2319 char b[BDEVNAME_SIZE];
2320
2321 printk(KERN_INFO "md: autorun ...\n");
2322 while (!list_empty(&pending_raid_disks)) {
2323 dev_t dev;
2324 rdev0 = list_entry(pending_raid_disks.next,
2325 mdk_rdev_t, same_set);
2326
2327 printk(KERN_INFO "md: considering %s ...\n",
2328 bdevname(rdev0->bdev,b));
2329 INIT_LIST_HEAD(&candidates);
2330 ITERATE_RDEV_PENDING(rdev,tmp)
2331 if (super_90_load(rdev, rdev0, 0) >= 0) {
2332 printk(KERN_INFO "md: adding %s ...\n",
2333 bdevname(rdev->bdev,b));
2334 list_move(&rdev->same_set, &candidates);
2335 }
2336 /*
2337 * now we have a set of devices, with all of them having
2338 * mostly sane superblocks. It's time to allocate the
2339 * mddev.
2340 */
2341 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
2342 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
2343 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
2344 break;
2345 }
2346 if (part)
2347 dev = MKDEV(mdp_major,
2348 rdev0->preferred_minor << MdpMinorShift);
2349 else
2350 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
2351
2352 md_probe(dev, NULL, NULL);
2353 mddev = mddev_find(dev);
2354 if (!mddev) {
2355 printk(KERN_ERR
2356 "md: cannot allocate memory for md drive.\n");
2357 break;
2358 }
2359 if (mddev_lock(mddev))
2360 printk(KERN_WARNING "md: %s locked, cannot run\n",
2361 mdname(mddev));
2362 else if (mddev->raid_disks || mddev->major_version
2363 || !list_empty(&mddev->disks)) {
2364 printk(KERN_WARNING
2365 "md: %s already running, cannot run %s\n",
2366 mdname(mddev), bdevname(rdev0->bdev,b));
2367 mddev_unlock(mddev);
2368 } else {
2369 printk(KERN_INFO "md: created %s\n", mdname(mddev));
2370 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
2371 list_del_init(&rdev->same_set);
2372 if (bind_rdev_to_array(rdev, mddev))
2373 export_rdev(rdev);
2374 }
2375 autorun_array(mddev);
2376 mddev_unlock(mddev);
2377 }
2378 /* on success, candidates will be empty, on error
2379 * it won't...
2380 */
2381 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
2382 export_rdev(rdev);
2383 mddev_put(mddev);
2384 }
2385 printk(KERN_INFO "md: ... autorun DONE.\n");
2386}
2387
2388/*
2389 * import RAID devices based on one partition
2390 * if possible, the array gets run as well.
2391 */
2392
2393static int autostart_array(dev_t startdev)
2394{
2395 char b[BDEVNAME_SIZE];
2396 int err = -EINVAL, i;
2397 mdp_super_t *sb = NULL;
2398 mdk_rdev_t *start_rdev = NULL, *rdev;
2399
2400 start_rdev = md_import_device(startdev, 0, 0);
2401 if (IS_ERR(start_rdev))
2402 return err;
2403
2404
2405 /* NOTE: this can only work for 0.90.0 superblocks */
2406 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
2407 if (sb->major_version != 0 ||
2408 sb->minor_version != 90 ) {
2409 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
2410 export_rdev(start_rdev);
2411 return err;
2412 }
2413
b2d444d7 2414 if (test_bit(Faulty, &start_rdev->flags)) {
1da177e4
LT		 2415 printk(KERN_WARNING
2416 "md: can not autostart based on faulty %s!\n",
2417 bdevname(start_rdev->bdev,b));
2418 export_rdev(start_rdev);
2419 return err;
2420 }
2421 list_add(&start_rdev->same_set, &pending_raid_disks);
2422
2423 for (i = 0; i < MD_SB_DISKS; i++) {
2424 mdp_disk_t *desc = sb->disks + i;
2425 dev_t dev = MKDEV(desc->major, desc->minor);
2426
2427 if (!dev)
2428 continue;
2429 if (dev == startdev)
2430 continue;
2431 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
2432 continue;
2433 rdev = md_import_device(dev, 0, 0);
2434 if (IS_ERR(rdev))
2435 continue;
2436
2437 list_add(&rdev->same_set, &pending_raid_disks);
2438 }
2439
2440 /*
2441 * possibly return codes
2442 */
2443 autorun_devices(0);
2444 return 0;
2445
2446}
2447
2448
2449static int get_version(void __user * arg)
2450{
2451 mdu_version_t ver;
2452
2453 ver.major = MD_MAJOR_VERSION;
2454 ver.minor = MD_MINOR_VERSION;
2455 ver.patchlevel = MD_PATCHLEVEL_VERSION;
2456
2457 if (copy_to_user(arg, &ver, sizeof(ver)))
2458 return -EFAULT;
2459
2460 return 0;
2461}
2462
2463static int get_array_info(mddev_t * mddev, void __user * arg)
2464{
2465 mdu_array_info_t info;
2466 int nr,working,active,failed,spare;
2467 mdk_rdev_t *rdev;
2468 struct list_head *tmp;
2469
2470 nr=working=active=failed=spare=0;
2471 ITERATE_RDEV(mddev,rdev,tmp) {
2472 nr++;
b2d444d7 2473 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2474 failed++;
2475 else {
2476 working++;
b2d444d7 2477 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 2478 active++;
2479 else
2480 spare++;
2481 }
2482 }
2483
2484 info.major_version = mddev->major_version;
2485 info.minor_version = mddev->minor_version;
2486 info.patch_version = MD_PATCHLEVEL_VERSION;
2487 info.ctime = mddev->ctime;
2488 info.level = mddev->level;
2489 info.size = mddev->size;
2490 info.nr_disks = nr;
2491 info.raid_disks = mddev->raid_disks;
2492 info.md_minor = mddev->md_minor;
2493 info.not_persistent= !mddev->persistent;
2494
2495 info.utime = mddev->utime;
2496 info.state = 0;
2497 if (mddev->in_sync)
2498 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 2499 if (mddev->bitmap && mddev->bitmap_offset)
2500 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 2501 info.active_disks = active;
2502 info.working_disks = working;
2503 info.failed_disks = failed;
2504 info.spare_disks = spare;
2505
2506 info.layout = mddev->layout;
2507 info.chunk_size = mddev->chunk_size;
2508
2509 if (copy_to_user(arg, &info, sizeof(info)))
2510 return -EFAULT;
2511
2512 return 0;
2513}
2514
87162a28 2515static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 2516{
2517 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
2518 char *ptr, *buf = NULL;
2519 int err = -ENOMEM;
2520
2521 file = kmalloc(sizeof(*file), GFP_KERNEL);
2522 if (!file)
2523 goto out;
2524
2525 /* bitmap disabled, zero the first byte and copy out */
2526 if (!mddev->bitmap || !mddev->bitmap->file) {
2527 file->pathname[0] = '\0';
2528 goto copy_out;
2529 }
2530
2531 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
2532 if (!buf)
2533 goto out;
2534
2535 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
2536 if (!ptr)
2537 goto out;
2538
2539 strcpy(file->pathname, ptr);
2540
2541copy_out:
2542 err = 0;
2543 if (copy_to_user(arg, file, sizeof(*file)))
2544 err = -EFAULT;
2545out:
2546 kfree(buf);
2547 kfree(file);
2548 return err;
2549}
2550
1da177e4
LT		 2551static int get_disk_info(mddev_t * mddev, void __user * arg)
2552{
2553 mdu_disk_info_t info;
2554 unsigned int nr;
2555 mdk_rdev_t *rdev;
2556
2557 if (copy_from_user(&info, arg, sizeof(info)))
2558 return -EFAULT;
2559
2560 nr = info.number;
2561
2562 rdev = find_rdev_nr(mddev, nr);
2563 if (rdev) {
2564 info.major = MAJOR(rdev->bdev->bd_dev);
2565 info.minor = MINOR(rdev->bdev->bd_dev);
2566 info.raid_disk = rdev->raid_disk;
2567 info.state = 0;
b2d444d7 2568 if (test_bit(Faulty, &rdev->flags))
1da177e4 2569 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 2570 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 2571 info.state |= (1<<MD_DISK_ACTIVE);
2572 info.state |= (1<<MD_DISK_SYNC);
2573 }
8ddf9efe
N		 2574 if (test_bit(WriteMostly, &rdev->flags))
2575 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 2576 } else {
2577 info.major = info.minor = 0;
2578 info.raid_disk = -1;
2579 info.state = (1<<MD_DISK_REMOVED);
2580 }
2581
2582 if (copy_to_user(arg, &info, sizeof(info)))
2583 return -EFAULT;
2584
2585 return 0;
2586}
2587
2588static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
2589{
2590 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
2591 mdk_rdev_t *rdev;
2592 dev_t dev = MKDEV(info->major,info->minor);
2593
2594 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
2595 return -EOVERFLOW;
2596
2597 if (!mddev->raid_disks) {
2598 int err;
2599 /* expecting a device which has a superblock */
2600 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
2601 if (IS_ERR(rdev)) {
2602 printk(KERN_WARNING
2603 "md: md_import_device returned %ld\n",
2604 PTR_ERR(rdev));
2605 return PTR_ERR(rdev);
2606 }
2607 if (!list_empty(&mddev->disks)) {
2608 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2609 mdk_rdev_t, same_set);
2610 int err = super_types[mddev->major_version]
2611 .load_super(rdev, rdev0, mddev->minor_version);
2612 if (err < 0) {
2613 printk(KERN_WARNING
2614 "md: %s has different UUID to %s\n",
2615 bdevname(rdev->bdev,b),
2616 bdevname(rdev0->bdev,b2));
2617 export_rdev(rdev);
2618 return -EINVAL;
2619 }
2620 }
2621 err = bind_rdev_to_array(rdev, mddev);
2622 if (err)
2623 export_rdev(rdev);
2624 return err;
2625 }
2626
2627 /*
2628 * add_new_disk can be used once the array is assembled
2629 * to add "hot spares". They must already have a superblock
2630 * written
2631 */
2632 if (mddev->pers) {
2633 int err;
2634 if (!mddev->pers->hot_add_disk) {
2635 printk(KERN_WARNING
2636 "%s: personality does not support diskops!\n",
2637 mdname(mddev));
2638 return -EINVAL;
2639 }
7b1e35f6
N		 2640 if (mddev->persistent)
2641 rdev = md_import_device(dev, mddev->major_version,
2642 mddev->minor_version);
2643 else
2644 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 2645 if (IS_ERR(rdev)) {
2646 printk(KERN_WARNING
2647 "md: md_import_device returned %ld\n",
2648 PTR_ERR(rdev));
2649 return PTR_ERR(rdev);
2650 }
41158c7e
N		 2651 /* set save_raid_disk if appropriate */
2652 if (!mddev->persistent) {
2653 if (info->state & (1<<MD_DISK_SYNC) &&
2654 info->raid_disk < mddev->raid_disks)
2655 rdev->raid_disk = info->raid_disk;
2656 else
2657 rdev->raid_disk = -1;
2658 } else
2659 super_types[mddev->major_version].
2660 validate_super(mddev, rdev);
2661 rdev->saved_raid_disk = rdev->raid_disk;
2662
b2d444d7 2663 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 2664 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
2665 set_bit(WriteMostly, &rdev->flags);
2666
1da177e4
LT		 2667 rdev->raid_disk = -1;
2668 err = bind_rdev_to_array(rdev, mddev);
2669 if (err)
2670 export_rdev(rdev);
c361777f
N		 2671
2672 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 2673 md_wakeup_thread(mddev->thread);
1da177e4
LT		 2674 return err;
2675 }
2676
2677 /* otherwise, add_new_disk is only allowed
2678 * for major_version==0 superblocks
2679 */
2680 if (mddev->major_version != 0) {
2681 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
2682 mdname(mddev));
2683 return -EINVAL;
2684 }
2685
2686 if (!(info->state & (1<<MD_DISK_FAULTY))) {
2687 int err;
2688 rdev = md_import_device (dev, -1, 0);
2689 if (IS_ERR(rdev)) {
2690 printk(KERN_WARNING
2691 "md: error, md_import_device() returned %ld\n",
2692 PTR_ERR(rdev));
2693 return PTR_ERR(rdev);
2694 }
2695 rdev->desc_nr = info->number;
2696 if (info->raid_disk < mddev->raid_disks)
2697 rdev->raid_disk = info->raid_disk;
2698 else
2699 rdev->raid_disk = -1;
2700
b2d444d7
N		 2701 rdev->flags = 0;
2702
1da177e4 2703 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 2704 if (info->state & (1<<MD_DISK_SYNC))
2705 set_bit(In_sync, &rdev->flags);
1da177e4 2706
8ddf9efe
N		 2707 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
2708 set_bit(WriteMostly, &rdev->flags);
2709
1da177e4
LT		 2710 err = bind_rdev_to_array(rdev, mddev);
2711 if (err) {
2712 export_rdev(rdev);
2713 return err;
2714 }
2715
2716 if (!mddev->persistent) {
2717 printk(KERN_INFO "md: nonpersistent superblock ...\n");
2718 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2719 } else
2720 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
2721 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
2722
2723 if (!mddev->size || (mddev->size > rdev->size))
2724 mddev->size = rdev->size;
2725 }
2726
2727 return 0;
2728}
2729
2730static int hot_remove_disk(mddev_t * mddev, dev_t dev)
2731{
2732 char b[BDEVNAME_SIZE];
2733 mdk_rdev_t *rdev;
2734
2735 if (!mddev->pers)
2736 return -ENODEV;
2737
2738 rdev = find_rdev(mddev, dev);
2739 if (!rdev)
2740 return -ENXIO;
2741
2742 if (rdev->raid_disk >= 0)
2743 goto busy;
2744
2745 kick_rdev_from_array(rdev);
2746 md_update_sb(mddev);
d7603b7e 2747 md_new_event(mddev);
1da177e4
LT		 2748
2749 return 0;
2750busy:
2751 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
2752 bdevname(rdev->bdev,b), mdname(mddev));
2753 return -EBUSY;
2754}
2755
2756static int hot_add_disk(mddev_t * mddev, dev_t dev)
2757{
2758 char b[BDEVNAME_SIZE];
2759 int err;
2760 unsigned int size;
2761 mdk_rdev_t *rdev;
2762
2763 if (!mddev->pers)
2764 return -ENODEV;
2765
2766 if (mddev->major_version != 0) {
2767 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
2768 " version-0 superblocks.\n",
2769 mdname(mddev));
2770 return -EINVAL;
2771 }
2772 if (!mddev->pers->hot_add_disk) {
2773 printk(KERN_WARNING
2774 "%s: personality does not support diskops!\n",
2775 mdname(mddev));
2776 return -EINVAL;
2777 }
2778
2779 rdev = md_import_device (dev, -1, 0);
2780 if (IS_ERR(rdev)) {
2781 printk(KERN_WARNING
2782 "md: error, md_import_device() returned %ld\n",
2783 PTR_ERR(rdev));
2784 return -EINVAL;
2785 }
2786
2787 if (mddev->persistent)
2788 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
2789 else
2790 rdev->sb_offset =
2791 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2792
2793 size = calc_dev_size(rdev, mddev->chunk_size);
2794 rdev->size = size;
2795
2796 if (size < mddev->size) {
2797 printk(KERN_WARNING
2798 "%s: disk size %llu blocks < array size %llu\n",
2799 mdname(mddev), (unsigned long long)size,
2800 (unsigned long long)mddev->size);
2801 err = -ENOSPC;
2802 goto abort_export;
2803 }
2804
b2d444d7 2805 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 2806 printk(KERN_WARNING
2807 "md: can not hot-add faulty %s disk to %s!\n",
2808 bdevname(rdev->bdev,b), mdname(mddev));
2809 err = -EINVAL;
2810 goto abort_export;
2811 }
b2d444d7 2812 clear_bit(In_sync, &rdev->flags);
1da177e4
LT		 2813 rdev->desc_nr = -1;
2814 bind_rdev_to_array(rdev, mddev);
2815
2816 /*
2817 * The rest should better be atomic, we can have disk failures
2818 * noticed in interrupt contexts ...
2819 */
2820
2821 if (rdev->desc_nr == mddev->max_disks) {
2822 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
2823 mdname(mddev));
2824 err = -EBUSY;
2825 goto abort_unbind_export;
2826 }
2827
2828 rdev->raid_disk = -1;
2829
2830 md_update_sb(mddev);
2831
2832 /*
2833 * Kick recovery, maybe this spare has to be added to the
2834 * array immediately.
2835 */
2836 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2837 md_wakeup_thread(mddev->thread);
d7603b7e 2838 md_new_event(mddev);
1da177e4
LT		 2839 return 0;
2840
2841abort_unbind_export:
2842 unbind_rdev_from_array(rdev);
2843
2844abort_export:
2845 export_rdev(rdev);
2846 return err;
2847}
2848
32a7627c
N		 2849/* similar to deny_write_access, but accounts for our holding a reference
2850 * to the file ourselves */
2851static int deny_bitmap_write_access(struct file * file)
2852{
2853 struct inode *inode = file->f_mapping->host;
2854
2855 spin_lock(&inode->i_lock);
2856 if (atomic_read(&inode->i_writecount) > 1) {
2857 spin_unlock(&inode->i_lock);
2858 return -ETXTBSY;
2859 }
2860 atomic_set(&inode->i_writecount, -1);
2861 spin_unlock(&inode->i_lock);
2862
2863 return 0;
2864}
2865
2866static int set_bitmap_file(mddev_t *mddev, int fd)
2867{
2868 int err;
2869
36fa3063
N		 2870 if (mddev->pers) {
2871 if (!mddev->pers->quiesce)
2872 return -EBUSY;
2873 if (mddev->recovery || mddev->sync_thread)
2874 return -EBUSY;
2875 /* we should be able to change the bitmap.. */
2876 }
32a7627c 2877
32a7627c 2878
36fa3063
N		 2879 if (fd >= 0) {
2880 if (mddev->bitmap)
2881 return -EEXIST; /* cannot add when bitmap is present */
2882 mddev->bitmap_file = fget(fd);
32a7627c 2883
36fa3063
N		 2884 if (mddev->bitmap_file == NULL) {
2885 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
2886 mdname(mddev));
2887 return -EBADF;
2888 }
2889
2890 err = deny_bitmap_write_access(mddev->bitmap_file);
2891 if (err) {
2892 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
2893 mdname(mddev));
2894 fput(mddev->bitmap_file);
2895 mddev->bitmap_file = NULL;
2896 return err;
2897 }
a654b9d8 2898 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 2899 } else if (mddev->bitmap == NULL)
2900 return -ENOENT; /* cannot remove what isn't there */
2901 err = 0;
2902 if (mddev->pers) {
2903 mddev->pers->quiesce(mddev, 1);
2904 if (fd >= 0)
2905 err = bitmap_create(mddev);
2906 if (fd < 0 || err)
2907 bitmap_destroy(mddev);
2908 mddev->pers->quiesce(mddev, 0);
2909 } else if (fd < 0) {
2910 if (mddev->bitmap_file)
2911 fput(mddev->bitmap_file);
2912 mddev->bitmap_file = NULL;
2913 }
2914
32a7627c
N		 2915 return err;
2916}
2917
1da177e4
LT		 2918/*
2919 * set_array_info is used two different ways
2920 * The original usage is when creating a new array.
2921 * In this usage, raid_disks is > 0 and it together with
2922 * level, size, not_persistent,layout,chunksize determine the
2923 * shape of the array.
2924 * This will always create an array with a type-0.90.0 superblock.
2925 * The newer usage is when assembling an array.
2926 * In this case raid_disks will be 0, and the major_version field is
2927 * use to determine which style super-blocks are to be found on the devices.
2928 * The minor and patch _version numbers are also kept incase the
2929 * super_block handler wishes to interpret them.
2930 */
2931static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
2932{
2933
2934 if (info->raid_disks == 0) {
2935 /* just setting version number for superblock loading */
2936 if (info->major_version < 0 ||
2937 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
2938 super_types[info->major_version].name == NULL) {
2939 /* maybe try to auto-load a module? */
2940 printk(KERN_INFO
2941 "md: superblock version %d not known\n",
2942 info->major_version);
2943 return -EINVAL;
2944 }
2945 mddev->major_version = info->major_version;
2946 mddev->minor_version = info->minor_version;
2947 mddev->patch_version = info->patch_version;
2948 return 0;
2949 }
2950 mddev->major_version = MD_MAJOR_VERSION;
2951 mddev->minor_version = MD_MINOR_VERSION;
2952 mddev->patch_version = MD_PATCHLEVEL_VERSION;
2953 mddev->ctime = get_seconds();
2954
2955 mddev->level = info->level;
2956 mddev->size = info->size;
2957 mddev->raid_disks = info->raid_disks;
2958 /* don't set md_minor, it is determined by which /dev/md* was
2959 * openned
2960 */
2961 if (info->state & (1<<MD_SB_CLEAN))
2962 mddev->recovery_cp = MaxSector;
2963 else
2964 mddev->recovery_cp = 0;
2965 mddev->persistent = ! info->not_persistent;
2966
2967 mddev->layout = info->layout;
2968 mddev->chunk_size = info->chunk_size;
2969
2970 mddev->max_disks = MD_SB_DISKS;
2971
2972 mddev->sb_dirty = 1;
2973
b2a2703c
N		 2974 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
2975 mddev->bitmap_offset = 0;
2976
1da177e4
LT		 2977 /*
2978 * Generate a 128 bit UUID
2979 */
2980 get_random_bytes(mddev->uuid, 16);
2981
2982 return 0;
2983}
2984
2985/*
2986 * update_array_info is used to change the configuration of an
2987 * on-line array.
2988 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
2989 * fields in the info are checked against the array.
2990 * Any differences that cannot be handled will cause an error.
2991 * Normally, only one change can be managed at a time.
2992 */
2993static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
2994{
2995 int rv = 0;
2996 int cnt = 0;
36fa3063
N		 2997 int state = 0;
2998
2999 /* calculate expected state,ignoring low bits */
3000 if (mddev->bitmap && mddev->bitmap_offset)
3001 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 3002
3003 if (mddev->major_version != info->major_version ||
3004 mddev->minor_version != info->minor_version ||
3005/* mddev->patch_version != info->patch_version || */
3006 mddev->ctime != info->ctime ||
3007 mddev->level != info->level ||
3008/* mddev->layout != info->layout || */
3009 !mddev->persistent != info->not_persistent||
36fa3063
N		 3010 mddev->chunk_size != info->chunk_size ||
3011 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
3012 ((state^info->state) & 0xfffffe00)
3013 )
1da177e4
LT		 3014 return -EINVAL;
3015 /* Check there is only one change */
3016 if (mddev->size != info->size) cnt++;
3017 if (mddev->raid_disks != info->raid_disks) cnt++;
3018 if (mddev->layout != info->layout) cnt++;
36fa3063 3019 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 3020 if (cnt == 0) return 0;
3021 if (cnt > 1) return -EINVAL;
3022
3023 if (mddev->layout != info->layout) {
3024 /* Change layout
3025 * we don't need to do anything at the md level, the
3026 * personality will take care of it all.
3027 */
3028 if (mddev->pers->reconfig == NULL)
3029 return -EINVAL;
3030 else
3031 return mddev->pers->reconfig(mddev, info->layout, -1);
3032 }
3033 if (mddev->size != info->size) {
3034 mdk_rdev_t * rdev;
3035 struct list_head *tmp;
3036 if (mddev->pers->resize == NULL)
3037 return -EINVAL;
3038 /* The "size" is the amount of each device that is used.
3039 * This can only make sense for arrays with redundancy.
3040 * linear and raid0 always use whatever space is available
3041 * We can only consider changing the size if no resync
3042 * or reconstruction is happening, and if the new size
3043 * is acceptable. It must fit before the sb_offset or,
3044 * if that is <data_offset, it must fit before the
3045 * size of each device.
3046 * If size is zero, we find the largest size that fits.
3047 */
3048 if (mddev->sync_thread)
3049 return -EBUSY;
3050 ITERATE_RDEV(mddev,rdev,tmp) {
3051 sector_t avail;
3052 int fit = (info->size == 0);
3053 if (rdev->sb_offset > rdev->data_offset)
3054 avail = (rdev->sb_offset*2) - rdev->data_offset;
3055 else
3056 avail = get_capacity(rdev->bdev->bd_disk)
3057 - rdev->data_offset;
3058 if (fit && (info->size == 0 || info->size > avail/2))
3059 info->size = avail/2;
3060 if (avail < ((sector_t)info->size << 1))
3061 return -ENOSPC;
3062 }
3063 rv = mddev->pers->resize(mddev, (sector_t)info->size *2);
3064 if (!rv) {
3065 struct block_device *bdev;
3066
3067 bdev = bdget_disk(mddev->gendisk, 0);
3068 if (bdev) {
3069 down(&bdev->bd_inode->i_sem);
3070 i_size_write(bdev->bd_inode, mddev->array_size << 10);
3071 up(&bdev->bd_inode->i_sem);
3072 bdput(bdev);
3073 }
3074 }
3075 }
3076 if (mddev->raid_disks != info->raid_disks) {
3077 /* change the number of raid disks */
3078 if (mddev->pers->reshape == NULL)
3079 return -EINVAL;
3080 if (info->raid_disks <= 0 ||
3081 info->raid_disks >= mddev->max_disks)
3082 return -EINVAL;
3083 if (mddev->sync_thread)
3084 return -EBUSY;
3085 rv = mddev->pers->reshape(mddev, info->raid_disks);
3086 if (!rv) {
3087 struct block_device *bdev;
3088
3089 bdev = bdget_disk(mddev->gendisk, 0);
3090 if (bdev) {
3091 down(&bdev->bd_inode->i_sem);
3092 i_size_write(bdev->bd_inode, mddev->array_size << 10);
3093 up(&bdev->bd_inode->i_sem);
3094 bdput(bdev);
3095 }
3096 }
3097 }
36fa3063
N		 3098 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
3099 if (mddev->pers->quiesce == NULL)
3100 return -EINVAL;
3101 if (mddev->recovery || mddev->sync_thread)
3102 return -EBUSY;
3103 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
3104 /* add the bitmap */
3105 if (mddev->bitmap)
3106 return -EEXIST;
3107 if (mddev->default_bitmap_offset == 0)
3108 return -EINVAL;
3109 mddev->bitmap_offset = mddev->default_bitmap_offset;
3110 mddev->pers->quiesce(mddev, 1);
3111 rv = bitmap_create(mddev);
3112 if (rv)
3113 bitmap_destroy(mddev);
3114 mddev->pers->quiesce(mddev, 0);
3115 } else {
3116 /* remove the bitmap */
3117 if (!mddev->bitmap)
3118 return -ENOENT;
3119 if (mddev->bitmap->file)
3120 return -EINVAL;
3121 mddev->pers->quiesce(mddev, 1);
3122 bitmap_destroy(mddev);
3123 mddev->pers->quiesce(mddev, 0);
3124 mddev->bitmap_offset = 0;
3125 }
3126 }
1da177e4
LT		 3127 md_update_sb(mddev);
3128 return rv;
3129}
3130
3131static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3132{
3133 mdk_rdev_t *rdev;
3134
3135 if (mddev->pers == NULL)
3136 return -ENODEV;
3137
3138 rdev = find_rdev(mddev, dev);
3139 if (!rdev)
3140 return -ENODEV;
3141
3142 md_error(mddev, rdev);
3143 return 0;
3144}
3145
3146static int md_ioctl(struct inode *inode, struct file *file,
3147 unsigned int cmd, unsigned long arg)
3148{
3149 int err = 0;
3150 void __user *argp = (void __user *)arg;
3151 struct hd_geometry __user *loc = argp;
3152 mddev_t *mddev = NULL;
3153
3154 if (!capable(CAP_SYS_ADMIN))
3155 return -EACCES;
3156
3157 /*
3158 * Commands dealing with the RAID driver but not any
3159 * particular array:
3160 */
3161 switch (cmd)
3162 {
3163 case RAID_VERSION:
3164 err = get_version(argp);
3165 goto done;
3166
3167 case PRINT_RAID_DEBUG:
3168 err = 0;
3169 md_print_devices();
3170 goto done;
3171
3172#ifndef MODULE
3173 case RAID_AUTORUN:
3174 err = 0;
3175 autostart_arrays(arg);
3176 goto done;
3177#endif
3178 default:;
3179 }
3180
3181 /*
3182 * Commands creating/starting a new array:
3183 */
3184
3185 mddev = inode->i_bdev->bd_disk->private_data;
3186
3187 if (!mddev) {
3188 BUG();
3189 goto abort;
3190 }
3191
3192
3193 if (cmd == START_ARRAY) {
3194 /* START_ARRAY doesn't need to lock the array as autostart_array
3195 * does the locking, and it could even be a different array
3196 */
3197 static int cnt = 3;
3198 if (cnt > 0 ) {
3199 printk(KERN_WARNING
3200 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
e8a00334 3201 "This will not be supported beyond July 2006\n",
1da177e4
LT		 3202 current->comm, current->pid);
3203 cnt--;
3204 }
3205 err = autostart_array(new_decode_dev(arg));
3206 if (err) {
3207 printk(KERN_WARNING "md: autostart failed!\n");
3208 goto abort;
3209 }
3210 goto done;
3211 }
3212
3213 err = mddev_lock(mddev);
3214 if (err) {
3215 printk(KERN_INFO
3216 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3217 err, cmd);
3218 goto abort;
3219 }
3220
3221 switch (cmd)
3222 {
3223 case SET_ARRAY_INFO:
3224 {
3225 mdu_array_info_t info;
3226 if (!arg)
3227 memset(&info, 0, sizeof(info));
3228 else if (copy_from_user(&info, argp, sizeof(info))) {
3229 err = -EFAULT;
3230 goto abort_unlock;
3231 }
3232 if (mddev->pers) {
3233 err = update_array_info(mddev, &info);
3234 if (err) {
3235 printk(KERN_WARNING "md: couldn't update"
3236 " array info. %d\n", err);
3237 goto abort_unlock;
3238 }
3239 goto done_unlock;
3240 }
3241 if (!list_empty(&mddev->disks)) {
3242 printk(KERN_WARNING
3243 "md: array %s already has disks!\n",
3244 mdname(mddev));
3245 err = -EBUSY;
3246 goto abort_unlock;
3247 }
3248 if (mddev->raid_disks) {
3249 printk(KERN_WARNING
3250 "md: array %s already initialised!\n",
3251 mdname(mddev));
3252 err = -EBUSY;
3253 goto abort_unlock;
3254 }
3255 err = set_array_info(mddev, &info);
3256 if (err) {
3257 printk(KERN_WARNING "md: couldn't set"
3258 " array info. %d\n", err);
3259 goto abort_unlock;
3260 }
3261 }
3262 goto done_unlock;
3263
3264 default:;
3265 }
3266
3267 /*
3268 * Commands querying/configuring an existing array:
3269 */
32a7627c
N		 3270 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3271 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3272 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3273 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
1da177e4
LT		 3274 err = -ENODEV;
3275 goto abort_unlock;
3276 }
3277
3278 /*
3279 * Commands even a read-only array can execute:
3280 */
3281 switch (cmd)
3282 {
3283 case GET_ARRAY_INFO:
3284 err = get_array_info(mddev, argp);
3285 goto done_unlock;
3286
32a7627c 3287 case GET_BITMAP_FILE:
87162a28 3288 err = get_bitmap_file(mddev, argp);
32a7627c
N		 3289 goto done_unlock;
3290
1da177e4
LT		 3291 case GET_DISK_INFO:
3292 err = get_disk_info(mddev, argp);
3293 goto done_unlock;
3294
3295 case RESTART_ARRAY_RW:
3296 err = restart_array(mddev);
3297 goto done_unlock;
3298
3299 case STOP_ARRAY:
3300 err = do_md_stop (mddev, 0);
3301 goto done_unlock;
3302
3303 case STOP_ARRAY_RO:
3304 err = do_md_stop (mddev, 1);
3305 goto done_unlock;
3306
3307 /*
3308 * We have a problem here : there is no easy way to give a CHS
3309 * virtual geometry. We currently pretend that we have a 2 heads
3310 * 4 sectors (with a BIG number of cylinders...). This drives
3311 * dosfs just mad... ;-)
3312 */
3313 case HDIO_GETGEO:
3314 if (!loc) {
3315 err = -EINVAL;
3316 goto abort_unlock;
3317 }
3318 err = put_user (2, (char __user *) &loc->heads);
3319 if (err)
3320 goto abort_unlock;
3321 err = put_user (4, (char __user *) &loc->sectors);
3322 if (err)
3323 goto abort_unlock;
3324 err = put_user(get_capacity(mddev->gendisk)/8,
3325 (short __user *) &loc->cylinders);
3326 if (err)
3327 goto abort_unlock;
3328 err = put_user (get_start_sect(inode->i_bdev),
3329 (long __user *) &loc->start);
3330 goto done_unlock;
3331 }
3332
3333 /*
3334 * The remaining ioctls are changing the state of the
f91de92e
N		 3335 * superblock, so we do not allow them on read-only arrays.
3336 * However non-MD ioctls (e.g. get-size) will still come through
3337 * here and hit the 'default' below, so only disallow
3338 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 3339 */
f91de92e
N		 3340 if (_IOC_TYPE(cmd) == MD_MAJOR &&
3341 mddev->ro && mddev->pers) {
3342 if (mddev->ro == 2) {
3343 mddev->ro = 0;
3344 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3345 md_wakeup_thread(mddev->thread);
3346
3347 } else {
3348 err = -EROFS;
3349 goto abort_unlock;
3350 }
1da177e4
LT		 3351 }
3352
3353 switch (cmd)
3354 {
3355 case ADD_NEW_DISK:
3356 {
3357 mdu_disk_info_t info;
3358 if (copy_from_user(&info, argp, sizeof(info)))
3359 err = -EFAULT;
3360 else
3361 err = add_new_disk(mddev, &info);
3362 goto done_unlock;
3363 }
3364
3365 case HOT_REMOVE_DISK:
3366 err = hot_remove_disk(mddev, new_decode_dev(arg));
3367 goto done_unlock;
3368
3369 case HOT_ADD_DISK:
3370 err = hot_add_disk(mddev, new_decode_dev(arg));
3371 goto done_unlock;
3372
3373 case SET_DISK_FAULTY:
3374 err = set_disk_faulty(mddev, new_decode_dev(arg));
3375 goto done_unlock;
3376
3377 case RUN_ARRAY:
3378 err = do_md_run (mddev);
3379 goto done_unlock;
3380
32a7627c
N		 3381 case SET_BITMAP_FILE:
3382 err = set_bitmap_file(mddev, (int)arg);
3383 goto done_unlock;
3384
1da177e4
LT		 3385 default:
3386 if (_IOC_TYPE(cmd) == MD_MAJOR)
3387 printk(KERN_WARNING "md: %s(pid %d) used"
3388 " obsolete MD ioctl, upgrade your"
3389 " software to use new ictls.\n",
3390 current->comm, current->pid);
3391 err = -EINVAL;
3392 goto abort_unlock;
3393 }
3394
3395done_unlock:
3396abort_unlock:
3397 mddev_unlock(mddev);
3398
3399 return err;
3400done:
3401 if (err)
3402 MD_BUG();
3403abort:
3404 return err;
3405}
3406
3407static int md_open(struct inode *inode, struct file *file)
3408{
3409 /*
3410 * Succeed if we can lock the mddev, which confirms that
3411 * it isn't being stopped right now.
3412 */
3413 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3414 int err;
3415
3416 if ((err = mddev_lock(mddev)))
3417 goto out;
3418
3419 err = 0;
3420 mddev_get(mddev);
3421 mddev_unlock(mddev);
3422
3423 check_disk_change(inode->i_bdev);
3424 out:
3425 return err;
3426}
3427
3428static int md_release(struct inode *inode, struct file * file)
3429{
3430 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3431
3432 if (!mddev)
3433 BUG();
3434 mddev_put(mddev);
3435
3436 return 0;
3437}
3438
3439static int md_media_changed(struct gendisk *disk)
3440{
3441 mddev_t *mddev = disk->private_data;
3442
3443 return mddev->changed;
3444}
3445
3446static int md_revalidate(struct gendisk *disk)
3447{
3448 mddev_t *mddev = disk->private_data;
3449
3450 mddev->changed = 0;
3451 return 0;
3452}
3453static struct block_device_operations md_fops =
3454{
3455 .owner = THIS_MODULE,
3456 .open = md_open,
3457 .release = md_release,
3458 .ioctl = md_ioctl,
3459 .media_changed = md_media_changed,
3460 .revalidate_disk= md_revalidate,
3461};
3462
75c96f85 3463static int md_thread(void * arg)
1da177e4
LT		 3464{
3465 mdk_thread_t *thread = arg;
3466
1da177e4
LT		 3467 /*
3468 * md_thread is a 'system-thread', it's priority should be very
3469 * high. We avoid resource deadlocks individually in each
3470 * raid personality. (RAID5 does preallocation) We also use RR and
3471 * the very same RT priority as kswapd, thus we will never get
3472 * into a priority inversion deadlock.
3473 *
3474 * we definitely have to have equal or higher priority than
3475 * bdflush, otherwise bdflush will deadlock if there are too
3476 * many dirty RAID5 blocks.
3477 */
1da177e4 3478
6985c43f 3479 allow_signal(SIGKILL);
a6fb0934 3480 while (!kthread_should_stop()) {
1da177e4 3481
93588e22
N		 3482 /* We need to wait INTERRUPTIBLE so that
3483 * we don't add to the load-average.
3484 * That means we need to be sure no signals are
3485 * pending
3486 */
3487 if (signal_pending(current))
3488 flush_signals(current);
3489
3490 wait_event_interruptible_timeout
3491 (thread->wqueue,
3492 test_bit(THREAD_WAKEUP, &thread->flags)
3493 || kthread_should_stop(),
3494 thread->timeout);
3e1d1d28 3495 try_to_freeze();
1da177e4
LT		 3496
3497 clear_bit(THREAD_WAKEUP, &thread->flags);
3498
787453c2 3499 thread->run(thread->mddev);
1da177e4 3500 }
a6fb0934 3501
1da177e4
LT		 3502 return 0;
3503}
3504
3505void md_wakeup_thread(mdk_thread_t *thread)
3506{
3507 if (thread) {
3508 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
3509 set_bit(THREAD_WAKEUP, &thread->flags);
3510 wake_up(&thread->wqueue);
3511 }
3512}
3513
3514mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
3515 const char *name)
3516{
3517 mdk_thread_t *thread;
1da177e4 3518
9ffae0cf 3519 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 3520 if (!thread)
3521 return NULL;
3522
1da177e4
LT		 3523 init_waitqueue_head(&thread->wqueue);
3524
1da177e4
LT		 3525 thread->run = run;
3526 thread->mddev = mddev;
32a7627c 3527 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 3528 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 3529 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 3530 kfree(thread);
3531 return NULL;
3532 }
1da177e4
LT		 3533 return thread;
3534}
3535
1da177e4
LT		 3536void md_unregister_thread(mdk_thread_t *thread)
3537{
d28446fe 3538 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
a6fb0934
N		 3539
3540 kthread_stop(thread->tsk);
1da177e4
LT		 3541 kfree(thread);
3542}
3543
3544void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
3545{
3546 if (!mddev) {
3547 MD_BUG();
3548 return;
3549 }
3550
b2d444d7 3551 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 3552 return;
32a7627c 3553/*
1da177e4
LT		 3554 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
3555 mdname(mddev),
3556 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
3557 __builtin_return_address(0),__builtin_return_address(1),
3558 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 3559*/
1da177e4
LT		 3560 if (!mddev->pers->error_handler)
3561 return;
3562 mddev->pers->error_handler(mddev,rdev);
3563 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3564 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3565 md_wakeup_thread(mddev->thread);
d7603b7e 3566 md_new_event(mddev);
1da177e4
LT		 3567}
3568
3569/* seq_file implementation /proc/mdstat */
3570
3571static void status_unused(struct seq_file *seq)
3572{
3573 int i = 0;
3574 mdk_rdev_t *rdev;
3575 struct list_head *tmp;
3576
3577 seq_printf(seq, "unused devices: ");
3578
3579 ITERATE_RDEV_PENDING(rdev,tmp) {
3580 char b[BDEVNAME_SIZE];
3581 i++;
3582 seq_printf(seq, "%s ",
3583 bdevname(rdev->bdev,b));
3584 }
3585 if (!i)
3586 seq_printf(seq, "<none>");
3587
3588 seq_printf(seq, "\n");
3589}
3590
3591
3592static void status_resync(struct seq_file *seq, mddev_t * mddev)
3593{
3594 unsigned long max_blocks, resync, res, dt, db, rt;
3595
3596 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
3597
3598 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3599 max_blocks = mddev->resync_max_sectors >> 1;
3600 else
3601 max_blocks = mddev->size;
3602
3603 /*
3604 * Should not happen.
3605 */
3606 if (!max_blocks) {
3607 MD_BUG();
3608 return;
3609 }
3610 res = (resync/1024)*1000/(max_blocks/1024 + 1);
3611 {
3612 int i, x = res/50, y = 20-x;
3613 seq_printf(seq, "[");
3614 for (i = 0; i < x; i++)
3615 seq_printf(seq, "=");
3616 seq_printf(seq, ">");
3617 for (i = 0; i < y; i++)
3618 seq_printf(seq, ".");
3619 seq_printf(seq, "] ");
3620 }
3621 seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)",
3622 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
3623 "resync" : "recovery"),
3624 res/10, res % 10, resync, max_blocks);
3625
3626 /*
3627 * We do not want to overflow, so the order of operands and
3628 * the * 100 / 100 trick are important. We do a +1 to be
3629 * safe against division by zero. We only estimate anyway.
3630 *
3631 * dt: time from mark until now
3632 * db: blocks written from mark until now
3633 * rt: remaining time
3634 */
3635 dt = ((jiffies - mddev->resync_mark) / HZ);
3636 if (!dt) dt++;
3637 db = resync - (mddev->resync_mark_cnt/2);
3638 rt = (dt * ((max_blocks-resync) / (db/100+1)))/100;
3639
3640 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
3641
3642 seq_printf(seq, " speed=%ldK/sec", db/dt);
3643}
3644
3645static void *md_seq_start(struct seq_file *seq, loff_t *pos)
3646{
3647 struct list_head *tmp;
3648 loff_t l = *pos;
3649 mddev_t *mddev;
3650
3651 if (l >= 0x10000)
3652 return NULL;
3653 if (!l--)
3654 /* header */
3655 return (void*)1;
3656
3657 spin_lock(&all_mddevs_lock);
3658 list_for_each(tmp,&all_mddevs)
3659 if (!l--) {
3660 mddev = list_entry(tmp, mddev_t, all_mddevs);
3661 mddev_get(mddev);
3662 spin_unlock(&all_mddevs_lock);
3663 return mddev;
3664 }
3665 spin_unlock(&all_mddevs_lock);
3666 if (!l--)
3667 return (void*)2;/* tail */
3668 return NULL;
3669}
3670
3671static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3672{
3673 struct list_head *tmp;
3674 mddev_t *next_mddev, *mddev = v;
3675
3676 ++*pos;
3677 if (v == (void*)2)
3678 return NULL;
3679
3680 spin_lock(&all_mddevs_lock);
3681 if (v == (void*)1)
3682 tmp = all_mddevs.next;
3683 else
3684 tmp = mddev->all_mddevs.next;
3685 if (tmp != &all_mddevs)
3686 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
3687 else {
3688 next_mddev = (void*)2;
3689 *pos = 0x10000;
3690 }
3691 spin_unlock(&all_mddevs_lock);
3692
3693 if (v != (void*)1)
3694 mddev_put(mddev);
3695 return next_mddev;
3696
3697}
3698
3699static void md_seq_stop(struct seq_file *seq, void *v)
3700{
3701 mddev_t *mddev = v;
3702
3703 if (mddev && v != (void*)1 && v != (void*)2)
3704 mddev_put(mddev);
3705}
3706
d7603b7e
N		 3707struct mdstat_info {
3708 int event;
3709};
3710
1da177e4
LT		 3711static int md_seq_show(struct seq_file *seq, void *v)
3712{
3713 mddev_t *mddev = v;
3714 sector_t size;
3715 struct list_head *tmp2;
3716 mdk_rdev_t *rdev;
d7603b7e 3717 struct mdstat_info *mi = seq->private;
32a7627c 3718 struct bitmap *bitmap;
1da177e4
LT		 3719
3720 if (v == (void*)1) {
2604b703 3721 struct mdk_personality *pers;
1da177e4
LT		 3722 seq_printf(seq, "Personalities : ");
3723 spin_lock(&pers_lock);
2604b703
N		 3724 list_for_each_entry(pers, &pers_list, list)
3725 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT		 3726
3727 spin_unlock(&pers_lock);
3728 seq_printf(seq, "\n");
d7603b7e 3729 mi->event = atomic_read(&md_event_count);
1da177e4
LT		 3730 return 0;
3731 }
3732 if (v == (void*)2) {
3733 status_unused(seq);
3734 return 0;
3735 }
3736
3737 if (mddev_lock(mddev)!=0)
3738 return -EINTR;
3739 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
3740 seq_printf(seq, "%s : %sactive", mdname(mddev),
3741 mddev->pers ? "" : "in");
3742 if (mddev->pers) {
f91de92e 3743 if (mddev->ro==1)
1da177e4 3744 seq_printf(seq, " (read-only)");
f91de92e
N		 3745 if (mddev->ro==2)
3746 seq_printf(seq, "(auto-read-only)");
1da177e4
LT		 3747 seq_printf(seq, " %s", mddev->pers->name);
3748 }
3749
3750 size = 0;
3751 ITERATE_RDEV(mddev,rdev,tmp2) {
3752 char b[BDEVNAME_SIZE];
3753 seq_printf(seq, " %s[%d]",
3754 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 3755 if (test_bit(WriteMostly, &rdev->flags))
3756 seq_printf(seq, "(W)");
b2d444d7 3757 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 3758 seq_printf(seq, "(F)");
3759 continue;
b325a32e
N		 3760 } else if (rdev->raid_disk < 0)
3761 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 3762 size += rdev->size;
3763 }
3764
3765 if (!list_empty(&mddev->disks)) {
3766 if (mddev->pers)
3767 seq_printf(seq, "\n %llu blocks",
3768 (unsigned long long)mddev->array_size);
3769 else
3770 seq_printf(seq, "\n %llu blocks",
3771 (unsigned long long)size);
3772 }
1cd6bf19
N		 3773 if (mddev->persistent) {
3774 if (mddev->major_version != 0 ||
3775 mddev->minor_version != 90) {
3776 seq_printf(seq," super %d.%d",
3777 mddev->major_version,
3778 mddev->minor_version);
3779 }
3780 } else
3781 seq_printf(seq, " super non-persistent");
1da177e4
LT		 3782
3783 if (mddev->pers) {
3784 mddev->pers->status (seq, mddev);
3785 seq_printf(seq, "\n ");
8e1b39d6
N		 3786 if (mddev->pers->sync_request) {
3787 if (mddev->curr_resync > 2) {
3788 status_resync (seq, mddev);
3789 seq_printf(seq, "\n ");
3790 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
3791 seq_printf(seq, "\tresync=DELAYED\n ");
3792 else if (mddev->recovery_cp < MaxSector)
3793 seq_printf(seq, "\tresync=PENDING\n ");
3794 }
32a7627c
N		 3795 } else
3796 seq_printf(seq, "\n ");
3797
3798 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 3799 unsigned long chunk_kb;
3800 unsigned long flags;
32a7627c
N		 3801 spin_lock_irqsave(&bitmap->lock, flags);
3802 chunk_kb = bitmap->chunksize >> 10;
3803 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
3804 "%lu%s chunk",
3805 bitmap->pages - bitmap->missing_pages,
3806 bitmap->pages,
3807 (bitmap->pages - bitmap->missing_pages)
3808 << (PAGE_SHIFT - 10),
3809 chunk_kb ? chunk_kb : bitmap->chunksize,
3810 chunk_kb ? "KB" : "B");
78d742d8
N		 3811 if (bitmap->file) {
3812 seq_printf(seq, ", file: ");
3813 seq_path(seq, bitmap->file->f_vfsmnt,
3814 bitmap->file->f_dentry," \t\n");
32a7627c 3815 }
78d742d8 3816
32a7627c
N		 3817 seq_printf(seq, "\n");
3818 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 3819 }
3820
3821 seq_printf(seq, "\n");
3822 }
3823 mddev_unlock(mddev);
3824
3825 return 0;
3826}
3827
3828static struct seq_operations md_seq_ops = {
3829 .start = md_seq_start,
3830 .next = md_seq_next,
3831 .stop = md_seq_stop,
3832 .show = md_seq_show,
3833};
3834
3835static int md_seq_open(struct inode *inode, struct file *file)
3836{
3837 int error;
d7603b7e
N		 3838 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
3839 if (mi == NULL)
3840 return -ENOMEM;
1da177e4
LT		 3841
3842 error = seq_open(file, &md_seq_ops);
d7603b7e
N		 3843 if (error)
3844 kfree(mi);
3845 else {
3846 struct seq_file *p = file->private_data;
3847 p->private = mi;
3848 mi->event = atomic_read(&md_event_count);
3849 }
1da177e4
LT		 3850 return error;
3851}
3852
d7603b7e
N		 3853static int md_seq_release(struct inode *inode, struct file *file)
3854{
3855 struct seq_file *m = file->private_data;
3856 struct mdstat_info *mi = m->private;
3857 m->private = NULL;
3858 kfree(mi);
3859 return seq_release(inode, file);
3860}
3861
3862static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
3863{
3864 struct seq_file *m = filp->private_data;
3865 struct mdstat_info *mi = m->private;
3866 int mask;
3867
3868 poll_wait(filp, &md_event_waiters, wait);
3869
3870 /* always allow read */
3871 mask = POLLIN | POLLRDNORM;
3872
3873 if (mi->event != atomic_read(&md_event_count))
3874 mask |= POLLERR | POLLPRI;
3875 return mask;
3876}
3877
1da177e4
LT		 3878static struct file_operations md_seq_fops = {
3879 .open = md_seq_open,
3880 .read = seq_read,
3881 .llseek = seq_lseek,
d7603b7e
N		 3882 .release = md_seq_release,
3883 .poll = mdstat_poll,
1da177e4
LT		 3884};
3885
2604b703 3886int register_md_personality(struct mdk_personality *p)
1da177e4 3887{
1da177e4 3888 spin_lock(&pers_lock);
2604b703
N		 3889 list_add_tail(&p->list, &pers_list);
3890 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
1da177e4
LT		 3891 spin_unlock(&pers_lock);
3892 return 0;
3893}
3894
2604b703 3895int unregister_md_personality(struct mdk_personality *p)
1da177e4 3896{
2604b703 3897 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 3898 spin_lock(&pers_lock);
2604b703 3899 list_del_init(&p->list);
1da177e4
LT		 3900 spin_unlock(&pers_lock);
3901 return 0;
3902}
3903
3904static int is_mddev_idle(mddev_t *mddev)
3905{
3906 mdk_rdev_t * rdev;
3907 struct list_head *tmp;
3908 int idle;
3909 unsigned long curr_events;
3910
3911 idle = 1;
3912 ITERATE_RDEV(mddev,rdev,tmp) {
3913 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 3914 curr_events = disk_stat_read(disk, sectors[0]) +
3915 disk_stat_read(disk, sectors[1]) -
1da177e4 3916 atomic_read(&disk->sync_io);
c0e48521
N		 3917 /* The difference between curr_events and last_events
3918 * will be affected by any new non-sync IO (making
3919 * curr_events bigger) and any difference in the amount of
3920 * in-flight syncio (making current_events bigger or smaller)
3921 * The amount in-flight is currently limited to
3922 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
3923 * which is at most 4096 sectors.
3924 * These numbers are fairly fragile and should be made
3925 * more robust, probably by enforcing the
3926 * 'window size' that md_do_sync sort-of uses.
3927 *
1da177e4
LT		 3928 * Note: the following is an unsigned comparison.
3929 */
c0e48521 3930 if ((curr_events - rdev->last_events + 4096) > 8192) {
1da177e4
LT		 3931 rdev->last_events = curr_events;
3932 idle = 0;
3933 }
3934 }
3935 return idle;
3936}
3937
3938void md_done_sync(mddev_t *mddev, int blocks, int ok)
3939{
3940 /* another "blocks" (512byte) blocks have been synced */
3941 atomic_sub(blocks, &mddev->recovery_active);
3942 wake_up(&mddev->recovery_wait);
3943 if (!ok) {
3944 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
3945 md_wakeup_thread(mddev->thread);
3946 // stop recovery, signal do_sync ....
3947 }
3948}
3949
3950
06d91a5f
N		 3951/* md_write_start(mddev, bi)
3952 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 3953 * in superblock) before writing, schedule a superblock update
3954 * and wait for it to complete.
06d91a5f 3955 */
3d310eb7 3956void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 3957{
06d91a5f 3958 if (bio_data_dir(bi) != WRITE)
3d310eb7 3959 return;
06d91a5f 3960
f91de92e
N		 3961 BUG_ON(mddev->ro == 1);
3962 if (mddev->ro == 2) {
3963 /* need to switch to read/write */
3964 mddev->ro = 0;
3965 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3966 md_wakeup_thread(mddev->thread);
3967 }
06d91a5f 3968 atomic_inc(&mddev->writes_pending);
06d91a5f 3969 if (mddev->in_sync) {
a9701a30 3970 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 3971 if (mddev->in_sync) {
3972 mddev->in_sync = 0;
3973 mddev->sb_dirty = 1;
3974 md_wakeup_thread(mddev->thread);
3975 }
a9701a30 3976 spin_unlock_irq(&mddev->write_lock);
06d91a5f 3977 }
3d310eb7 3978 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
1da177e4
LT		 3979}
3980
3981void md_write_end(mddev_t *mddev)
3982{
3983 if (atomic_dec_and_test(&mddev->writes_pending)) {
3984 if (mddev->safemode == 2)
3985 md_wakeup_thread(mddev->thread);
3986 else
3987 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
3988 }
3989}
3990
75c96f85 3991static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
1da177e4
LT		 3992
3993#define SYNC_MARKS 10
3994#define SYNC_MARK_STEP (3*HZ)
3995static void md_do_sync(mddev_t *mddev)
3996{
3997 mddev_t *mddev2;
3998 unsigned int currspeed = 0,
3999 window;
57afd89f 4000 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 4001 unsigned long mark[SYNC_MARKS];
4002 sector_t mark_cnt[SYNC_MARKS];
4003 int last_mark,m;
4004 struct list_head *tmp;
4005 sector_t last_check;
57afd89f 4006 int skipped = 0;
1da177e4
LT		 4007
4008 /* just incase thread restarts... */
4009 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
4010 return;
4011
4012 /* we overload curr_resync somewhat here.
4013 * 0 == not engaged in resync at all
4014 * 2 == checking that there is no conflict with another sync
4015 * 1 == like 2, but have yielded to allow conflicting resync to
4016 * commense
4017 * other == active in resync - this many blocks
4018 *
4019 * Before starting a resync we must have set curr_resync to
4020 * 2, and then checked that every "conflicting" array has curr_resync
4021 * less than ours. When we find one that is the same or higher
4022 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
4023 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
4024 * This will mean we have to start checking from the beginning again.
4025 *
4026 */
4027
4028 do {
4029 mddev->curr_resync = 2;
4030
4031 try_again:
787453c2 4032 if (kthread_should_stop()) {
6985c43f 4033 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 4034 goto skip;
4035 }
4036 ITERATE_MDDEV(mddev2,tmp) {
1da177e4
LT		 4037 if (mddev2 == mddev)
4038 continue;
4039 if (mddev2->curr_resync &&
4040 match_mddev_units(mddev,mddev2)) {
4041 DEFINE_WAIT(wq);
4042 if (mddev < mddev2 && mddev->curr_resync == 2) {
4043 /* arbitrarily yield */
4044 mddev->curr_resync = 1;
4045 wake_up(&resync_wait);
4046 }
4047 if (mddev > mddev2 && mddev->curr_resync == 1)
4048 /* no need to wait here, we can wait the next
4049 * time 'round when curr_resync == 2
4050 */
4051 continue;
787453c2
N		 4052 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
4053 if (!kthread_should_stop() &&
8712e553 4054 mddev2->curr_resync >= mddev->curr_resync) {
1da177e4
LT		 4055 printk(KERN_INFO "md: delaying resync of %s"
4056 " until %s has finished resync (they"
4057 " share one or more physical units)\n",
4058 mdname(mddev), mdname(mddev2));
4059 mddev_put(mddev2);
4060 schedule();
4061 finish_wait(&resync_wait, &wq);
4062 goto try_again;
4063 }
4064 finish_wait(&resync_wait, &wq);
4065 }
4066 }
4067 } while (mddev->curr_resync < 2);
4068
9d88883e 4069 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 4070 /* resync follows the size requested by the personality,
57afd89f 4071 * which defaults to physical size, but can be virtual size
1da177e4
LT		 4072 */
4073 max_sectors = mddev->resync_max_sectors;
9d88883e
N		 4074 mddev->resync_mismatches = 0;
4075 } else
1da177e4
LT		 4076 /* recovery follows the physical size of devices */
4077 max_sectors = mddev->size << 1;
4078
4079 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
4080 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
4081 " %d KB/sec/disc.\n", sysctl_speed_limit_min);
338cec32 4082 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
1da177e4
LT		 4083 "(but not more than %d KB/sec) for reconstruction.\n",
4084 sysctl_speed_limit_max);
4085
4086 is_mddev_idle(mddev); /* this also initializes IO event counters */
32a7627c 4087 /* we don't use the checkpoint if there's a bitmap */
24dd469d
N		 4088 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap
4089 && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
1da177e4
LT		 4090 j = mddev->recovery_cp;
4091 else
4092 j = 0;
57afd89f 4093 io_sectors = 0;
1da177e4
LT		 4094 for (m = 0; m < SYNC_MARKS; m++) {
4095 mark[m] = jiffies;
57afd89f 4096 mark_cnt[m] = io_sectors;
1da177e4
LT		 4097 }
4098 last_mark = 0;
4099 mddev->resync_mark = mark[last_mark];
4100 mddev->resync_mark_cnt = mark_cnt[last_mark];
4101
4102 /*
4103 * Tune reconstruction:
4104 */
4105 window = 32*(PAGE_SIZE/512);
4106 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
4107 window/2,(unsigned long long) max_sectors/2);
4108
4109 atomic_set(&mddev->recovery_active, 0);
4110 init_waitqueue_head(&mddev->recovery_wait);
4111 last_check = 0;
4112
4113 if (j>2) {
4114 printk(KERN_INFO
4115 "md: resuming recovery of %s from checkpoint.\n",
4116 mdname(mddev));
4117 mddev->curr_resync = j;
4118 }
4119
4120 while (j < max_sectors) {
57afd89f 4121 sector_t sectors;
1da177e4 4122
57afd89f
N		 4123 skipped = 0;
4124 sectors = mddev->pers->sync_request(mddev, j, &skipped,
4125 currspeed < sysctl_speed_limit_min);
4126 if (sectors == 0) {
1da177e4
LT		 4127 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4128 goto out;
4129 }
57afd89f
N		 4130
4131 if (!skipped) { /* actual IO requested */
4132 io_sectors += sectors;
4133 atomic_add(sectors, &mddev->recovery_active);
4134 }
4135
1da177e4
LT		 4136 j += sectors;
4137 if (j>1) mddev->curr_resync = j;
d7603b7e
N		 4138 if (last_check == 0)
4139 /* this is the earliers that rebuilt will be
4140 * visible in /proc/mdstat
4141 */
4142 md_new_event(mddev);
57afd89f
N		 4143
4144 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 4145 continue;
4146
57afd89f 4147 last_check = io_sectors;
1da177e4
LT		 4148
4149 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
4150 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
4151 break;
4152
4153 repeat:
4154 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
4155 /* step marks */
4156 int next = (last_mark+1) % SYNC_MARKS;
4157
4158 mddev->resync_mark = mark[next];
4159 mddev->resync_mark_cnt = mark_cnt[next];
4160 mark[next] = jiffies;
57afd89f 4161 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 4162 last_mark = next;
4163 }
4164
4165
787453c2 4166 if (kthread_should_stop()) {
1da177e4
LT		 4167 /*
4168 * got a signal, exit.
4169 */
4170 printk(KERN_INFO
4171 "md: md_do_sync() got signal ... exiting\n");
1da177e4
LT		 4172 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4173 goto out;
4174 }
4175
4176 /*
4177 * this loop exits only if either when we are slower than
4178 * the 'hard' speed limit, or the system was IO-idle for
4179 * a jiffy.
4180 * the system might be non-idle CPU-wise, but we only care
4181 * about not overloading the IO subsystem. (things like an
4182 * e2fsck being done on the RAID array should execute fast)
4183 */
4184 mddev->queue->unplug_fn(mddev->queue);
4185 cond_resched();
4186
57afd89f
N		 4187 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
4188 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4
LT		 4189
4190 if (currspeed > sysctl_speed_limit_min) {
4191 if ((currspeed > sysctl_speed_limit_max) ||
4192 !is_mddev_idle(mddev)) {
c0e48521 4193 msleep(500);
1da177e4
LT		 4194 goto repeat;
4195 }
4196 }
4197 }
4198 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
4199 /*
4200 * this also signals 'finished resyncing' to md_stop
4201 */
4202 out:
4203 mddev->queue->unplug_fn(mddev->queue);
4204
4205 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
4206
4207 /* tell personality that we are finished */
57afd89f 4208 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 4209
4210 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4211 mddev->curr_resync > 2 &&
4212 mddev->curr_resync >= mddev->recovery_cp) {
4213 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4214 printk(KERN_INFO
4215 "md: checkpointing recovery of %s.\n",
4216 mdname(mddev));
4217 mddev->recovery_cp = mddev->curr_resync;
4218 } else
4219 mddev->recovery_cp = MaxSector;
4220 }
4221
1da177e4
LT		 4222 skip:
4223 mddev->curr_resync = 0;
4224 wake_up(&resync_wait);
4225 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
4226 md_wakeup_thread(mddev->thread);
4227}
4228
4229
4230/*
4231 * This routine is regularly called by all per-raid-array threads to
4232 * deal with generic issues like resync and super-block update.
4233 * Raid personalities that don't have a thread (linear/raid0) do not
4234 * need this as they never do any recovery or update the superblock.
4235 *
4236 * It does not do any resync itself, but rather "forks" off other threads
4237 * to do that as needed.
4238 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4239 * "->recovery" and create a thread at ->sync_thread.
4240 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4241 * and wakeups up this thread which will reap the thread and finish up.
4242 * This thread also removes any faulty devices (with nr_pending == 0).
4243 *
4244 * The overall approach is:
4245 * 1/ if the superblock needs updating, update it.
4246 * 2/ If a recovery thread is running, don't do anything else.
4247 * 3/ If recovery has finished, clean up, possibly marking spares active.
4248 * 4/ If there are any faulty devices, remove them.
4249 * 5/ If array is degraded, try to add spares devices
4250 * 6/ If array has spares or is not in-sync, start a resync thread.
4251 */
4252void md_check_recovery(mddev_t *mddev)
4253{
4254 mdk_rdev_t *rdev;
4255 struct list_head *rtmp;
4256
4257
5f40402d
N		 4258 if (mddev->bitmap)
4259 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 4260
4261 if (mddev->ro)
4262 return;
fca4d848
N		 4263
4264 if (signal_pending(current)) {
4265 if (mddev->pers->sync_request) {
4266 printk(KERN_INFO "md: %s in immediate safe mode\n",
4267 mdname(mddev));
4268 mddev->safemode = 2;
4269 }
4270 flush_signals(current);
4271 }
4272
1da177e4
LT		 4273 if ( ! (
4274 mddev->sb_dirty ||
4275 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848
N		 4276 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
4277 (mddev->safemode == 1) ||
4278 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
4279 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 4280 ))
4281 return;
fca4d848 4282
1da177e4
LT		 4283 if (mddev_trylock(mddev)==0) {
4284 int spares =0;
fca4d848 4285
a9701a30 4286 spin_lock_irq(&mddev->write_lock);
fca4d848
N		 4287 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
4288 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
4289 mddev->in_sync = 1;
4290 mddev->sb_dirty = 1;
4291 }
4292 if (mddev->safemode == 1)
4293 mddev->safemode = 0;
a9701a30 4294 spin_unlock_irq(&mddev->write_lock);
fca4d848 4295
1da177e4
LT		 4296 if (mddev->sb_dirty)
4297 md_update_sb(mddev);
06d91a5f 4298
06d91a5f 4299
1da177e4
LT		 4300 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4301 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
4302 /* resync/recovery still happening */
4303 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4304 goto unlock;
4305 }
4306 if (mddev->sync_thread) {
4307 /* resync has finished, collect result */
4308 md_unregister_thread(mddev->sync_thread);
4309 mddev->sync_thread = NULL;
4310 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4311 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4312 /* success...*/
4313 /* activate any spares */
4314 mddev->pers->spare_active(mddev);
4315 }
4316 md_update_sb(mddev);
41158c7e
N		 4317
4318 /* if array is no-longer degraded, then any saved_raid_disk
4319 * information must be scrapped
4320 */
4321 if (!mddev->degraded)
4322 ITERATE_RDEV(mddev,rdev,rtmp)
4323 rdev->saved_raid_disk = -1;
4324
1da177e4
LT		 4325 mddev->recovery = 0;
4326 /* flag recovery needed just to double check */
4327 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
d7603b7e 4328 md_new_event(mddev);
1da177e4
LT		 4329 goto unlock;
4330 }
24dd469d
N		 4331 /* Clear some bits that don't mean anything, but
4332 * might be left set
4333 */
4334 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4335 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
4336 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
4337 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4
LT		 4338
4339 /* no recovery is running.
4340 * remove any failed drives, then
4341 * add spares if possible.
4342 * Spare are also removed and re-added, to allow
4343 * the personality to fail the re-add.
4344 */
4345 ITERATE_RDEV(mddev,rdev,rtmp)
4346 if (rdev->raid_disk >= 0 &&
b2d444d7 4347 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
1da177e4 4348 atomic_read(&rdev->nr_pending)==0) {
86e6ffdd
N		 4349 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
4350 char nm[20];
4351 sprintf(nm,"rd%d", rdev->raid_disk);
4352 sysfs_remove_link(&mddev->kobj, nm);
1da177e4 4353 rdev->raid_disk = -1;
86e6ffdd 4354 }
1da177e4
LT		 4355 }
4356
4357 if (mddev->degraded) {
4358 ITERATE_RDEV(mddev,rdev,rtmp)
4359 if (rdev->raid_disk < 0
b2d444d7 4360 && !test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 4361 if (mddev->pers->hot_add_disk(mddev,rdev)) {
4362 char nm[20];
4363 sprintf(nm, "rd%d", rdev->raid_disk);
4364 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
1da177e4 4365 spares++;
d7603b7e 4366 md_new_event(mddev);
86e6ffdd 4367 } else
1da177e4
LT		 4368 break;
4369 }
4370 }
4371
24dd469d
N		 4372 if (spares) {
4373 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4374 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4375 } else if (mddev->recovery_cp < MaxSector) {
4376 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4377 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4378 /* nothing to be done ... */
1da177e4 4379 goto unlock;
24dd469d 4380
1da177e4
LT		 4381 if (mddev->pers->sync_request) {
4382 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 4383 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
4384 /* We are adding a device or devices to an array
4385 * which has the bitmap stored on all devices.
4386 * So make sure all bitmap pages get written
4387 */
4388 bitmap_write_all(mddev->bitmap);
4389 }
1da177e4
LT		 4390 mddev->sync_thread = md_register_thread(md_do_sync,
4391 mddev,
4392 "%s_resync");
4393 if (!mddev->sync_thread) {
4394 printk(KERN_ERR "%s: could not start resync"
4395 " thread...\n",
4396 mdname(mddev));
4397 /* leave the spares where they are, it shouldn't hurt */
4398 mddev->recovery = 0;
d7603b7e 4399 } else
1da177e4 4400 md_wakeup_thread(mddev->sync_thread);
d7603b7e 4401 md_new_event(mddev);
1da177e4
LT		 4402 }
4403 unlock:
4404 mddev_unlock(mddev);
4405 }
4406}
4407
75c96f85
AB		 4408static int md_notify_reboot(struct notifier_block *this,
4409 unsigned long code, void *x)
1da177e4
LT		 4410{
4411 struct list_head *tmp;
4412 mddev_t *mddev;
4413
4414 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
4415
4416 printk(KERN_INFO "md: stopping all md devices.\n");
4417
4418 ITERATE_MDDEV(mddev,tmp)
4419 if (mddev_trylock(mddev)==0)
4420 do_md_stop (mddev, 1);
4421 /*
4422 * certain more exotic SCSI devices are known to be
4423 * volatile wrt too early system reboots. While the
4424 * right place to handle this issue is the given
4425 * driver, we do want to have a safe RAID driver ...
4426 */
4427 mdelay(1000*1);
4428 }
4429 return NOTIFY_DONE;
4430}
4431
75c96f85 4432static struct notifier_block md_notifier = {
1da177e4
LT		 4433 .notifier_call = md_notify_reboot,
4434 .next = NULL,
4435 .priority = INT_MAX, /* before any real devices */
4436};
4437
4438static void md_geninit(void)
4439{
4440 struct proc_dir_entry *p;
4441
4442 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
4443
4444 p = create_proc_entry("mdstat", S_IRUGO, NULL);
4445 if (p)
4446 p->proc_fops = &md_seq_fops;
4447}
4448
75c96f85 4449static int __init md_init(void)
1da177e4
LT		 4450{
4451 int minor;
4452
4453 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4454 " MD_SB_DISKS=%d\n",
4455 MD_MAJOR_VERSION, MD_MINOR_VERSION,
4456 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
bd926c63 4457 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
32a7627c 4458 BITMAP_MINOR);
1da177e4
LT		 4459
4460 if (register_blkdev(MAJOR_NR, "md"))
4461 return -1;
4462 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
4463 unregister_blkdev(MAJOR_NR, "md");
4464 return -1;
4465 }
4466 devfs_mk_dir("md");
4467 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
4468 md_probe, NULL, NULL);
4469 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
4470 md_probe, NULL, NULL);
4471
4472 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4473 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
4474 S_IFBLK|S_IRUSR|S_IWUSR,
4475 "md/%d", minor);
4476
4477 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4478 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
4479 S_IFBLK|S_IRUSR|S_IWUSR,
4480 "md/mdp%d", minor);
4481
4482
4483 register_reboot_notifier(&md_notifier);
4484 raid_table_header = register_sysctl_table(raid_root_table, 1);
4485
4486 md_geninit();
4487 return (0);
4488}
4489
4490
4491#ifndef MODULE
4492
4493/*
4494 * Searches all registered partitions for autorun RAID arrays
4495 * at boot time.
4496 */
4497static dev_t detected_devices[128];
4498static int dev_cnt;
4499
4500void md_autodetect_dev(dev_t dev)
4501{
4502 if (dev_cnt >= 0 && dev_cnt < 127)
4503 detected_devices[dev_cnt++] = dev;
4504}
4505
4506
4507static void autostart_arrays(int part)
4508{
4509 mdk_rdev_t *rdev;
4510 int i;
4511
4512 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
4513
4514 for (i = 0; i < dev_cnt; i++) {
4515 dev_t dev = detected_devices[i];
4516
4517 rdev = md_import_device(dev,0, 0);
4518 if (IS_ERR(rdev))
4519 continue;
4520
b2d444d7 4521 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4522 MD_BUG();
4523 continue;
4524 }
4525 list_add(&rdev->same_set, &pending_raid_disks);
4526 }
4527 dev_cnt = 0;
4528
4529 autorun_devices(part);
4530}
4531
4532#endif
4533
4534static __exit void md_exit(void)
4535{
4536 mddev_t *mddev;
4537 struct list_head *tmp;
4538 int i;
4539 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
4540 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
4541 for (i=0; i < MAX_MD_DEVS; i++)
4542 devfs_remove("md/%d", i);
4543 for (i=0; i < MAX_MD_DEVS; i++)
4544 devfs_remove("md/d%d", i);
4545
4546 devfs_remove("md");
4547
4548 unregister_blkdev(MAJOR_NR,"md");
4549 unregister_blkdev(mdp_major, "mdp");
4550 unregister_reboot_notifier(&md_notifier);
4551 unregister_sysctl_table(raid_table_header);
4552 remove_proc_entry("mdstat", NULL);
4553 ITERATE_MDDEV(mddev,tmp) {
4554 struct gendisk *disk = mddev->gendisk;
4555 if (!disk)
4556 continue;
4557 export_array(mddev);
4558 del_gendisk(disk);
4559 put_disk(disk);
4560 mddev->gendisk = NULL;
4561 mddev_put(mddev);
4562 }
4563}
4564
4565module_init(md_init)
4566module_exit(md_exit)
4567
f91de92e
N		 4568static int get_ro(char *buffer, struct kernel_param *kp)
4569{
4570 return sprintf(buffer, "%d", start_readonly);
4571}
4572static int set_ro(const char *val, struct kernel_param *kp)
4573{
4574 char *e;
4575 int num = simple_strtoul(val, &e, 10);
4576 if (*val && (*e == '\0' || *e == '\n')) {
4577 start_readonly = num;
4578 return 0;;
4579 }
4580 return -EINVAL;
4581}
4582
4583module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
6ff8d8ec
N		 4584module_param(start_dirty_degraded, int, 0644);
4585
f91de92e 4586
1da177e4
LT		 4587EXPORT_SYMBOL(register_md_personality);
4588EXPORT_SYMBOL(unregister_md_personality);
4589EXPORT_SYMBOL(md_error);
4590EXPORT_SYMBOL(md_done_sync);
4591EXPORT_SYMBOL(md_write_start);
4592EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 4593EXPORT_SYMBOL(md_register_thread);
4594EXPORT_SYMBOL(md_unregister_thread);
4595EXPORT_SYMBOL(md_wakeup_thread);
4596EXPORT_SYMBOL(md_print_devices);
4597EXPORT_SYMBOL(md_check_recovery);
4598MODULE_LICENSE("GPL");
aa1595e9 4599MODULE_ALIAS("md");
72008652 4600MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
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