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[PATCH] md: break out of a loop that doesn't need to run to completion
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / md / md.c
CommitLineData
1da177e4
LT		 1/*
2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
4
5 completely rewritten, based on the MD driver code from Marc Zyngier
6
7 Changes:
8
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
16
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
19
20 Neil Brown <neilb@cse.unsw.edu.au>.
21
32a7627c
N		 22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
24
1da177e4
LT		 25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
28 any later version.
29
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
33*/
34
35#include <linux/module.h>
36#include <linux/config.h>
a6fb0934 37#include <linux/kthread.h>
1da177e4
LT		 38#include <linux/linkage.h>
39#include <linux/raid/md.h>
32a7627c 40#include <linux/raid/bitmap.h>
1da177e4
LT		 41#include <linux/sysctl.h>
42#include <linux/devfs_fs_kernel.h>
43#include <linux/buffer_head.h> /* for invalidate_bdev */
44#include <linux/suspend.h>
d7603b7e 45#include <linux/poll.h>
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
71static mdk_personality_t *pers[MAX_PERSONALITY];
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 */
147DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
148static atomic_t md_event_count;
149void md_new_event(mddev_t *mddev)
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
282mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
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
77933d72 306static inline sector_t calc_dev_sboffset(struct block_device *bdev)
1da177e4
LT		 307{
308 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
309 return MD_NEW_SIZE_BLOCKS(size);
310}
311
312static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
313{
314 sector_t size;
315
316 size = rdev->sb_offset;
317
318 if (chunk_size)
319 size &= ~((sector_t)chunk_size/1024 - 1);
320 return size;
321}
322
323static int alloc_disk_sb(mdk_rdev_t * rdev)
324{
325 if (rdev->sb_page)
326 MD_BUG();
327
328 rdev->sb_page = alloc_page(GFP_KERNEL);
329 if (!rdev->sb_page) {
330 printk(KERN_ALERT "md: out of memory.\n");
331 return -EINVAL;
332 }
333
334 return 0;
335}
336
337static void free_disk_sb(mdk_rdev_t * rdev)
338{
339 if (rdev->sb_page) {
2d1f3b5d 340 put_page(rdev->sb_page);
1da177e4
LT		 341 rdev->sb_loaded = 0;
342 rdev->sb_page = NULL;
343 rdev->sb_offset = 0;
344 rdev->size = 0;
345 }
346}
347
348
7bfa19f2
N		 349static int super_written(struct bio *bio, unsigned int bytes_done, int error)
350{
351 mdk_rdev_t *rdev = bio->bi_private;
a9701a30 352 mddev_t *mddev = rdev->mddev;
7bfa19f2
N		 353 if (bio->bi_size)
354 return 1;
355
356 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags))
a9701a30 357 md_error(mddev, rdev);
7bfa19f2 358
a9701a30
N		 359 if (atomic_dec_and_test(&mddev->pending_writes))
360 wake_up(&mddev->sb_wait);
f8b58edf 361 bio_put(bio);
7bfa19f2
N		 362 return 0;
363}
364
a9701a30
N		 365static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
366{
367 struct bio *bio2 = bio->bi_private;
368 mdk_rdev_t *rdev = bio2->bi_private;
369 mddev_t *mddev = rdev->mddev;
370 if (bio->bi_size)
371 return 1;
372
373 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
374 error == -EOPNOTSUPP) {
375 unsigned long flags;
376 /* barriers don't appear to be supported :-( */
377 set_bit(BarriersNotsupp, &rdev->flags);
378 mddev->barriers_work = 0;
379 spin_lock_irqsave(&mddev->write_lock, flags);
380 bio2->bi_next = mddev->biolist;
381 mddev->biolist = bio2;
382 spin_unlock_irqrestore(&mddev->write_lock, flags);
383 wake_up(&mddev->sb_wait);
384 bio_put(bio);
385 return 0;
386 }
387 bio_put(bio2);
388 bio->bi_private = rdev;
389 return super_written(bio, bytes_done, error);
390}
391
7bfa19f2
N		 392void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
393 sector_t sector, int size, struct page *page)
394{
395 /* write first size bytes of page to sector of rdev
396 * Increment mddev->pending_writes before returning
397 * and decrement it on completion, waking up sb_wait
398 * if zero is reached.
399 * If an error occurred, call md_error
a9701a30
N		 400 *
401 * As we might need to resubmit the request if BIO_RW_BARRIER
402 * causes ENOTSUPP, we allocate a spare bio...
7bfa19f2
N		 403 */
404 struct bio *bio = bio_alloc(GFP_NOIO, 1);
a9701a30 405 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
7bfa19f2
N		 406
407 bio->bi_bdev = rdev->bdev;
408 bio->bi_sector = sector;
409 bio_add_page(bio, page, size, 0);
410 bio->bi_private = rdev;
411 bio->bi_end_io = super_written;
a9701a30
N		 412 bio->bi_rw = rw;
413
7bfa19f2 414 atomic_inc(&mddev->pending_writes);
a9701a30
N		 415 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
416 struct bio *rbio;
417 rw |= (1<<BIO_RW_BARRIER);
418 rbio = bio_clone(bio, GFP_NOIO);
419 rbio->bi_private = bio;
420 rbio->bi_end_io = super_written_barrier;
421 submit_bio(rw, rbio);
422 } else
423 submit_bio(rw, bio);
424}
425
426void md_super_wait(mddev_t *mddev)
427{
428 /* wait for all superblock writes that were scheduled to complete.
429 * if any had to be retried (due to BARRIER problems), retry them
430 */
431 DEFINE_WAIT(wq);
432 for(;;) {
433 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
434 if (atomic_read(&mddev->pending_writes)==0)
435 break;
436 while (mddev->biolist) {
437 struct bio *bio;
438 spin_lock_irq(&mddev->write_lock);
439 bio = mddev->biolist;
440 mddev->biolist = bio->bi_next ;
441 bio->bi_next = NULL;
442 spin_unlock_irq(&mddev->write_lock);
443 submit_bio(bio->bi_rw, bio);
444 }
445 schedule();
446 }
447 finish_wait(&mddev->sb_wait, &wq);
7bfa19f2
N		 448}
449
1da177e4
LT		 450static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
451{
452 if (bio->bi_size)
453 return 1;
454
455 complete((struct completion*)bio->bi_private);
456 return 0;
457}
458
a654b9d8 459int sync_page_io(struct block_device *bdev, sector_t sector, int size,
1da177e4
LT		 460 struct page *page, int rw)
461{
baaa2c51 462 struct bio *bio = bio_alloc(GFP_NOIO, 1);
1da177e4
LT		 463 struct completion event;
464 int ret;
465
466 rw |= (1 << BIO_RW_SYNC);
467
468 bio->bi_bdev = bdev;
469 bio->bi_sector = sector;
470 bio_add_page(bio, page, size, 0);
471 init_completion(&event);
472 bio->bi_private = &event;
473 bio->bi_end_io = bi_complete;
474 submit_bio(rw, bio);
475 wait_for_completion(&event);
476
477 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
478 bio_put(bio);
479 return ret;
480}
a8745db2 481EXPORT_SYMBOL_GPL(sync_page_io);
1da177e4 482
0002b271 483static int read_disk_sb(mdk_rdev_t * rdev, int size)
1da177e4
LT		 484{
485 char b[BDEVNAME_SIZE];
486 if (!rdev->sb_page) {
487 MD_BUG();
488 return -EINVAL;
489 }
490 if (rdev->sb_loaded)
491 return 0;
492
493
0002b271 494 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
1da177e4
LT		 495 goto fail;
496 rdev->sb_loaded = 1;
497 return 0;
498
499fail:
500 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
501 bdevname(rdev->bdev,b));
502 return -EINVAL;
503}
504
505static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
506{
507 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
508 (sb1->set_uuid1 == sb2->set_uuid1) &&
509 (sb1->set_uuid2 == sb2->set_uuid2) &&
510 (sb1->set_uuid3 == sb2->set_uuid3))
511
512 return 1;
513
514 return 0;
515}
516
517
518static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
519{
520 int ret;
521 mdp_super_t *tmp1, *tmp2;
522
523 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
524 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
525
526 if (!tmp1 || !tmp2) {
527 ret = 0;
528 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
529 goto abort;
530 }
531
532 *tmp1 = *sb1;
533 *tmp2 = *sb2;
534
535 /*
536 * nr_disks is not constant
537 */
538 tmp1->nr_disks = 0;
539 tmp2->nr_disks = 0;
540
541 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
542 ret = 0;
543 else
544 ret = 1;
545
546abort:
990a8baf
JJ		 547 kfree(tmp1);
548 kfree(tmp2);
1da177e4
LT		 549 return ret;
550}
551
552static unsigned int calc_sb_csum(mdp_super_t * sb)
553{
554 unsigned int disk_csum, csum;
555
556 disk_csum = sb->sb_csum;
557 sb->sb_csum = 0;
558 csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
559 sb->sb_csum = disk_csum;
560 return csum;
561}
562
563
564/*
565 * Handle superblock details.
566 * We want to be able to handle multiple superblock formats
567 * so we have a common interface to them all, and an array of
568 * different handlers.
569 * We rely on user-space to write the initial superblock, and support
570 * reading and updating of superblocks.
571 * Interface methods are:
572 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
573 * loads and validates a superblock on dev.
574 * if refdev != NULL, compare superblocks on both devices
575 * Return:
576 * 0 - dev has a superblock that is compatible with refdev
577 * 1 - dev has a superblock that is compatible and newer than refdev
578 * so dev should be used as the refdev in future
579 * -EINVAL superblock incompatible or invalid
580 * -othererror e.g. -EIO
581 *
582 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
583 * Verify that dev is acceptable into mddev.
584 * The first time, mddev->raid_disks will be 0, and data from
585 * dev should be merged in. Subsequent calls check that dev
586 * is new enough. Return 0 or -EINVAL
587 *
588 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
589 * Update the superblock for rdev with data in mddev
590 * This does not write to disc.
591 *
592 */
593
594struct super_type {
595 char *name;
596 struct module *owner;
597 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
598 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
599 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
600};
601
602/*
603 * load_super for 0.90.0
604 */
605static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
606{
607 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
608 mdp_super_t *sb;
609 int ret;
610 sector_t sb_offset;
611
612 /*
613 * Calculate the position of the superblock,
614 * it's at the end of the disk.
615 *
616 * It also happens to be a multiple of 4Kb.
617 */
618 sb_offset = calc_dev_sboffset(rdev->bdev);
619 rdev->sb_offset = sb_offset;
620
0002b271 621 ret = read_disk_sb(rdev, MD_SB_BYTES);
1da177e4
LT		 622 if (ret) return ret;
623
624 ret = -EINVAL;
625
626 bdevname(rdev->bdev, b);
627 sb = (mdp_super_t*)page_address(rdev->sb_page);
628
629 if (sb->md_magic != MD_SB_MAGIC) {
630 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
631 b);
632 goto abort;
633 }
634
635 if (sb->major_version != 0 ||
636 sb->minor_version != 90) {
637 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
638 sb->major_version, sb->minor_version,
639 b);
640 goto abort;
641 }
642
643 if (sb->raid_disks <= 0)
644 goto abort;
645
646 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
647 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
648 b);
649 goto abort;
650 }
651
652 rdev->preferred_minor = sb->md_minor;
653 rdev->data_offset = 0;
0002b271 654 rdev->sb_size = MD_SB_BYTES;
1da177e4
LT		 655
656 if (sb->level == LEVEL_MULTIPATH)
657 rdev->desc_nr = -1;
658 else
659 rdev->desc_nr = sb->this_disk.number;
660
661 if (refdev == 0)
662 ret = 1;
663 else {
664 __u64 ev1, ev2;
665 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
666 if (!uuid_equal(refsb, sb)) {
667 printk(KERN_WARNING "md: %s has different UUID to %s\n",
668 b, bdevname(refdev->bdev,b2));
669 goto abort;
670 }
671 if (!sb_equal(refsb, sb)) {
672 printk(KERN_WARNING "md: %s has same UUID"
673 " but different superblock to %s\n",
674 b, bdevname(refdev->bdev, b2));
675 goto abort;
676 }
677 ev1 = md_event(sb);
678 ev2 = md_event(refsb);
679 if (ev1 > ev2)
680 ret = 1;
681 else
682 ret = 0;
683 }
684 rdev->size = calc_dev_size(rdev, sb->chunk_size);
685
686 abort:
687 return ret;
688}
689
690/*
691 * validate_super for 0.90.0
692 */
693static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
694{
695 mdp_disk_t *desc;
696 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
697
41158c7e 698 rdev->raid_disk = -1;
b2d444d7 699 rdev->flags = 0;
1da177e4
LT		 700 if (mddev->raid_disks == 0) {
701 mddev->major_version = 0;
702 mddev->minor_version = sb->minor_version;
703 mddev->patch_version = sb->patch_version;
704 mddev->persistent = ! sb->not_persistent;
705 mddev->chunk_size = sb->chunk_size;
706 mddev->ctime = sb->ctime;
707 mddev->utime = sb->utime;
708 mddev->level = sb->level;
709 mddev->layout = sb->layout;
710 mddev->raid_disks = sb->raid_disks;
711 mddev->size = sb->size;
712 mddev->events = md_event(sb);
9223214e 713 mddev->bitmap_offset = 0;
36fa3063 714 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
1da177e4
LT		 715
716 if (sb->state & (1<<MD_SB_CLEAN))
717 mddev->recovery_cp = MaxSector;
718 else {
719 if (sb->events_hi == sb->cp_events_hi &&
720 sb->events_lo == sb->cp_events_lo) {
721 mddev->recovery_cp = sb->recovery_cp;
722 } else
723 mddev->recovery_cp = 0;
724 }
725
726 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
727 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
728 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
729 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
730
731 mddev->max_disks = MD_SB_DISKS;
a654b9d8
N		 732
733 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
734 mddev->bitmap_file == NULL) {
6cce3b23
N		 735 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
736 && mddev->level != 10) {
a654b9d8 737 /* FIXME use a better test */
6cce3b23 738 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
a654b9d8
N		 739 return -EINVAL;
740 }
36fa3063 741 mddev->bitmap_offset = mddev->default_bitmap_offset;
a654b9d8
N		 742 }
743
41158c7e
N		 744 } else if (mddev->pers == NULL) {
745 /* Insist on good event counter while assembling */
746 __u64 ev1 = md_event(sb);
1da177e4
LT		 747 ++ev1;
748 if (ev1 < mddev->events)
749 return -EINVAL;
41158c7e
N		 750 } else if (mddev->bitmap) {
751 /* if adding to array with a bitmap, then we can accept an
752 * older device ... but not too old.
753 */
754 __u64 ev1 = md_event(sb);
755 if (ev1 < mddev->bitmap->events_cleared)
756 return 0;
757 } else /* just a hot-add of a new device, leave raid_disk at -1 */
758 return 0;
759
1da177e4 760 if (mddev->level != LEVEL_MULTIPATH) {
1da177e4
LT		 761 desc = sb->disks + rdev->desc_nr;
762
763 if (desc->state & (1<<MD_DISK_FAULTY))
b2d444d7 764 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 765 else if (desc->state & (1<<MD_DISK_SYNC) &&
766 desc->raid_disk < mddev->raid_disks) {
b2d444d7 767 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 768 rdev->raid_disk = desc->raid_disk;
769 }
8ddf9efe
N		 770 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
771 set_bit(WriteMostly, &rdev->flags);
41158c7e 772 } else /* MULTIPATH are always insync */
b2d444d7 773 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 774 return 0;
775}
776
777/*
778 * sync_super for 0.90.0
779 */
780static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
781{
782 mdp_super_t *sb;
783 struct list_head *tmp;
784 mdk_rdev_t *rdev2;
785 int next_spare = mddev->raid_disks;
19133a42 786
1da177e4
LT		 787
788 /* make rdev->sb match mddev data..
789 *
790 * 1/ zero out disks
791 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
792 * 3/ any empty disks < next_spare become removed
793 *
794 * disks[0] gets initialised to REMOVED because
795 * we cannot be sure from other fields if it has
796 * been initialised or not.
797 */
798 int i;
799 int active=0, working=0,failed=0,spare=0,nr_disks=0;
800
61181565
N		 801 rdev->sb_size = MD_SB_BYTES;
802
1da177e4
LT		 803 sb = (mdp_super_t*)page_address(rdev->sb_page);
804
805 memset(sb, 0, sizeof(*sb));
806
807 sb->md_magic = MD_SB_MAGIC;
808 sb->major_version = mddev->major_version;
809 sb->minor_version = mddev->minor_version;
810 sb->patch_version = mddev->patch_version;
811 sb->gvalid_words = 0; /* ignored */
812 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
813 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
814 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
815 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
816
817 sb->ctime = mddev->ctime;
818 sb->level = mddev->level;
819 sb->size = mddev->size;
820 sb->raid_disks = mddev->raid_disks;
821 sb->md_minor = mddev->md_minor;
822 sb->not_persistent = !mddev->persistent;
823 sb->utime = mddev->utime;
824 sb->state = 0;
825 sb->events_hi = (mddev->events>>32);
826 sb->events_lo = (u32)mddev->events;
827
828 if (mddev->in_sync)
829 {
830 sb->recovery_cp = mddev->recovery_cp;
831 sb->cp_events_hi = (mddev->events>>32);
832 sb->cp_events_lo = (u32)mddev->events;
833 if (mddev->recovery_cp == MaxSector)
834 sb->state = (1<< MD_SB_CLEAN);
835 } else
836 sb->recovery_cp = 0;
837
838 sb->layout = mddev->layout;
839 sb->chunk_size = mddev->chunk_size;
840
a654b9d8
N		 841 if (mddev->bitmap && mddev->bitmap_file == NULL)
842 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
843
1da177e4
LT		 844 sb->disks[0].state = (1<<MD_DISK_REMOVED);
845 ITERATE_RDEV(mddev,rdev2,tmp) {
846 mdp_disk_t *d;
86e6ffdd 847 int desc_nr;
b2d444d7
N		 848 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
849 && !test_bit(Faulty, &rdev2->flags))
86e6ffdd 850 desc_nr = rdev2->raid_disk;
1da177e4 851 else
86e6ffdd 852 desc_nr = next_spare++;
19133a42 853 rdev2->desc_nr = desc_nr;
1da177e4
LT		 854 d = &sb->disks[rdev2->desc_nr];
855 nr_disks++;
856 d->number = rdev2->desc_nr;
857 d->major = MAJOR(rdev2->bdev->bd_dev);
858 d->minor = MINOR(rdev2->bdev->bd_dev);
b2d444d7
N		 859 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
860 && !test_bit(Faulty, &rdev2->flags))
1da177e4
LT		 861 d->raid_disk = rdev2->raid_disk;
862 else
863 d->raid_disk = rdev2->desc_nr; /* compatibility */
b2d444d7 864 if (test_bit(Faulty, &rdev2->flags)) {
1da177e4
LT		 865 d->state = (1<<MD_DISK_FAULTY);
866 failed++;
b2d444d7 867 } else if (test_bit(In_sync, &rdev2->flags)) {
1da177e4
LT		 868 d->state = (1<<MD_DISK_ACTIVE);
869 d->state |= (1<<MD_DISK_SYNC);
870 active++;
871 working++;
872 } else {
873 d->state = 0;
874 spare++;
875 working++;
876 }
8ddf9efe
N		 877 if (test_bit(WriteMostly, &rdev2->flags))
878 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4 879 }
1da177e4
LT		 880 /* now set the "removed" and "faulty" bits on any missing devices */
881 for (i=0 ; i < mddev->raid_disks ; i++) {
882 mdp_disk_t *d = &sb->disks[i];
883 if (d->state == 0 && d->number == 0) {
884 d->number = i;
885 d->raid_disk = i;
886 d->state = (1<<MD_DISK_REMOVED);
887 d->state |= (1<<MD_DISK_FAULTY);
888 failed++;
889 }
890 }
891 sb->nr_disks = nr_disks;
892 sb->active_disks = active;
893 sb->working_disks = working;
894 sb->failed_disks = failed;
895 sb->spare_disks = spare;
896
897 sb->this_disk = sb->disks[rdev->desc_nr];
898 sb->sb_csum = calc_sb_csum(sb);
899}
900
901/*
902 * version 1 superblock
903 */
904
905static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
906{
907 unsigned int disk_csum, csum;
908 unsigned long long newcsum;
909 int size = 256 + le32_to_cpu(sb->max_dev)*2;
910 unsigned int *isuper = (unsigned int*)sb;
911 int i;
912
913 disk_csum = sb->sb_csum;
914 sb->sb_csum = 0;
915 newcsum = 0;
916 for (i=0; size>=4; size -= 4 )
917 newcsum += le32_to_cpu(*isuper++);
918
919 if (size == 2)
920 newcsum += le16_to_cpu(*(unsigned short*) isuper);
921
922 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
923 sb->sb_csum = disk_csum;
924 return cpu_to_le32(csum);
925}
926
927static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
928{
929 struct mdp_superblock_1 *sb;
930 int ret;
931 sector_t sb_offset;
932 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 933 int bmask;
1da177e4
LT		 934
935 /*
936 * Calculate the position of the superblock.
937 * It is always aligned to a 4K boundary and
938 * depeding on minor_version, it can be:
939 * 0: At least 8K, but less than 12K, from end of device
940 * 1: At start of device
941 * 2: 4K from start of device.
942 */
943 switch(minor_version) {
944 case 0:
945 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
946 sb_offset -= 8*2;
39730960 947 sb_offset &= ~(sector_t)(4*2-1);
1da177e4
LT		 948 /* convert from sectors to K */
949 sb_offset /= 2;
950 break;
951 case 1:
952 sb_offset = 0;
953 break;
954 case 2:
955 sb_offset = 4;
956 break;
957 default:
958 return -EINVAL;
959 }
960 rdev->sb_offset = sb_offset;
961
0002b271
N		 962 /* superblock is rarely larger than 1K, but it can be larger,
963 * and it is safe to read 4k, so we do that
964 */
965 ret = read_disk_sb(rdev, 4096);
1da177e4
LT		 966 if (ret) return ret;
967
968
969 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
970
971 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
972 sb->major_version != cpu_to_le32(1) ||
973 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
974 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
71c0805c 975 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT		 976 return -EINVAL;
977
978 if (calc_sb_1_csum(sb) != sb->sb_csum) {
979 printk("md: invalid superblock checksum on %s\n",
980 bdevname(rdev->bdev,b));
981 return -EINVAL;
982 }
983 if (le64_to_cpu(sb->data_size) < 10) {
984 printk("md: data_size too small on %s\n",
985 bdevname(rdev->bdev,b));
986 return -EINVAL;
987 }
988 rdev->preferred_minor = 0xffff;
989 rdev->data_offset = le64_to_cpu(sb->data_offset);
990
0002b271 991 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
720a3dc3 992 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
0002b271
N		 993 if (rdev->sb_size & bmask)
994 rdev-> sb_size = (rdev->sb_size | bmask)+1;
995
1da177e4
LT		 996 if (refdev == 0)
997 return 1;
998 else {
999 __u64 ev1, ev2;
1000 struct mdp_superblock_1 *refsb =
1001 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1002
1003 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1004 sb->level != refsb->level ||
1005 sb->layout != refsb->layout ||
1006 sb->chunksize != refsb->chunksize) {
1007 printk(KERN_WARNING "md: %s has strangely different"
1008 " superblock to %s\n",
1009 bdevname(rdev->bdev,b),
1010 bdevname(refdev->bdev,b2));
1011 return -EINVAL;
1012 }
1013 ev1 = le64_to_cpu(sb->events);
1014 ev2 = le64_to_cpu(refsb->events);
1015
1016 if (ev1 > ev2)
1017 return 1;
1018 }
1019 if (minor_version)
1020 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1021 else
1022 rdev->size = rdev->sb_offset;
1023 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1024 return -EINVAL;
1025 rdev->size = le64_to_cpu(sb->data_size)/2;
1026 if (le32_to_cpu(sb->chunksize))
1027 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1028 return 0;
1029}
1030
1031static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1032{
1033 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1034
41158c7e 1035 rdev->raid_disk = -1;
b2d444d7 1036 rdev->flags = 0;
1da177e4
LT		 1037 if (mddev->raid_disks == 0) {
1038 mddev->major_version = 1;
1039 mddev->patch_version = 0;
1040 mddev->persistent = 1;
1041 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1042 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1043 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1044 mddev->level = le32_to_cpu(sb->level);
1045 mddev->layout = le32_to_cpu(sb->layout);
1046 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1047 mddev->size = le64_to_cpu(sb->size)/2;
1048 mddev->events = le64_to_cpu(sb->events);
9223214e 1049 mddev->bitmap_offset = 0;
53e87fbb 1050 mddev->default_bitmap_offset = 1024;
1da177e4
LT		 1051
1052 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1053 memcpy(mddev->uuid, sb->set_uuid, 16);
1054
1055 mddev->max_disks = (4096-256)/2;
a654b9d8 1056
71c0805c 1057 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
a654b9d8 1058 mddev->bitmap_file == NULL ) {
6cce3b23
N		 1059 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
1060 && mddev->level != 10) {
1061 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
a654b9d8
N		 1062 return -EINVAL;
1063 }
1064 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1065 }
41158c7e
N		 1066 } else if (mddev->pers == NULL) {
1067 /* Insist of good event counter while assembling */
1068 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4
LT		 1069 ++ev1;
1070 if (ev1 < mddev->events)
1071 return -EINVAL;
41158c7e
N		 1072 } else if (mddev->bitmap) {
1073 /* If adding to array with a bitmap, then we can accept an
1074 * older device, but not too old.
1075 */
1076 __u64 ev1 = le64_to_cpu(sb->events);
1077 if (ev1 < mddev->bitmap->events_cleared)
1078 return 0;
1079 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1080 return 0;
1da177e4
LT		 1081
1082 if (mddev->level != LEVEL_MULTIPATH) {
1083 int role;
1084 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1085 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1086 switch(role) {
1087 case 0xffff: /* spare */
1da177e4
LT		 1088 break;
1089 case 0xfffe: /* faulty */
b2d444d7 1090 set_bit(Faulty, &rdev->flags);
1da177e4
LT		 1091 break;
1092 default:
b2d444d7 1093 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1094 rdev->raid_disk = role;
1095 break;
1096 }
8ddf9efe
N		 1097 if (sb->devflags & WriteMostly1)
1098 set_bit(WriteMostly, &rdev->flags);
41158c7e 1099 } else /* MULTIPATH are always insync */
b2d444d7 1100 set_bit(In_sync, &rdev->flags);
41158c7e 1101
1da177e4
LT		 1102 return 0;
1103}
1104
1105static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1106{
1107 struct mdp_superblock_1 *sb;
1108 struct list_head *tmp;
1109 mdk_rdev_t *rdev2;
1110 int max_dev, i;
1111 /* make rdev->sb match mddev and rdev data. */
1112
1113 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1114
1115 sb->feature_map = 0;
1116 sb->pad0 = 0;
1117 memset(sb->pad1, 0, sizeof(sb->pad1));
1118 memset(sb->pad2, 0, sizeof(sb->pad2));
1119 memset(sb->pad3, 0, sizeof(sb->pad3));
1120
1121 sb->utime = cpu_to_le64((__u64)mddev->utime);
1122 sb->events = cpu_to_le64(mddev->events);
1123 if (mddev->in_sync)
1124 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1125 else
1126 sb->resync_offset = cpu_to_le64(0);
1127
a654b9d8
N		 1128 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1129 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
71c0805c 1130 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8
N		 1131 }
1132
1da177e4
LT		 1133 max_dev = 0;
1134 ITERATE_RDEV(mddev,rdev2,tmp)
1135 if (rdev2->desc_nr+1 > max_dev)
1136 max_dev = rdev2->desc_nr+1;
1137
1138 sb->max_dev = cpu_to_le32(max_dev);
1139 for (i=0; i<max_dev;i++)
1140 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1141
1142 ITERATE_RDEV(mddev,rdev2,tmp) {
1143 i = rdev2->desc_nr;
b2d444d7 1144 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1145 sb->dev_roles[i] = cpu_to_le16(0xfffe);
b2d444d7 1146 else if (test_bit(In_sync, &rdev2->flags))
1da177e4
LT		 1147 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1148 else
1149 sb->dev_roles[i] = cpu_to_le16(0xffff);
1150 }
1151
1152 sb->recovery_offset = cpu_to_le64(0); /* not supported yet */
1153 sb->sb_csum = calc_sb_1_csum(sb);
1154}
1155
1156
75c96f85 1157static struct super_type super_types[] = {
1da177e4
LT		 1158 [0] = {
1159 .name = "0.90.0",
1160 .owner = THIS_MODULE,
1161 .load_super = super_90_load,
1162 .validate_super = super_90_validate,
1163 .sync_super = super_90_sync,
1164 },
1165 [1] = {
1166 .name = "md-1",
1167 .owner = THIS_MODULE,
1168 .load_super = super_1_load,
1169 .validate_super = super_1_validate,
1170 .sync_super = super_1_sync,
1171 },
1172};
1173
1174static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1175{
1176 struct list_head *tmp;
1177 mdk_rdev_t *rdev;
1178
1179 ITERATE_RDEV(mddev,rdev,tmp)
1180 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1181 return rdev;
1182
1183 return NULL;
1184}
1185
1186static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1187{
1188 struct list_head *tmp;
1189 mdk_rdev_t *rdev;
1190
1191 ITERATE_RDEV(mddev1,rdev,tmp)
1192 if (match_dev_unit(mddev2, rdev))
1193 return 1;
1194
1195 return 0;
1196}
1197
1198static LIST_HEAD(pending_raid_disks);
1199
1200static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1201{
1202 mdk_rdev_t *same_pdev;
1203 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
f637b9f9 1204 struct kobject *ko;
1da177e4
LT		 1205
1206 if (rdev->mddev) {
1207 MD_BUG();
1208 return -EINVAL;
1209 }
1210 same_pdev = match_dev_unit(mddev, rdev);
1211 if (same_pdev)
1212 printk(KERN_WARNING
1213 "%s: WARNING: %s appears to be on the same physical"
1214 " disk as %s. True\n protection against single-disk"
1215 " failure might be compromised.\n",
1216 mdname(mddev), bdevname(rdev->bdev,b),
1217 bdevname(same_pdev->bdev,b2));
1218
1219 /* Verify rdev->desc_nr is unique.
1220 * If it is -1, assign a free number, else
1221 * check number is not in use
1222 */
1223 if (rdev->desc_nr < 0) {
1224 int choice = 0;
1225 if (mddev->pers) choice = mddev->raid_disks;
1226 while (find_rdev_nr(mddev, choice))
1227 choice++;
1228 rdev->desc_nr = choice;
1229 } else {
1230 if (find_rdev_nr(mddev, rdev->desc_nr))
1231 return -EBUSY;
1232 }
19133a42
N		 1233 bdevname(rdev->bdev,b);
1234 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1235 return -ENOMEM;
1da177e4
LT		 1236
1237 list_add(&rdev->same_set, &mddev->disks);
1238 rdev->mddev = mddev;
19133a42 1239 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 1240
9c791977 1241 rdev->kobj.parent = &mddev->kobj;
86e6ffdd
N		 1242 kobject_add(&rdev->kobj);
1243
f637b9f9
N		 1244 if (rdev->bdev->bd_part)
1245 ko = &rdev->bdev->bd_part->kobj;
1246 else
1247 ko = &rdev->bdev->bd_disk->kobj;
1248 sysfs_create_link(&rdev->kobj, ko, "block");
1da177e4
LT		 1249 return 0;
1250}
1251
1252static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1253{
1254 char b[BDEVNAME_SIZE];
1255 if (!rdev->mddev) {
1256 MD_BUG();
1257 return;
1258 }
1259 list_del_init(&rdev->same_set);
1260 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1261 rdev->mddev = NULL;
86e6ffdd
N		 1262 sysfs_remove_link(&rdev->kobj, "block");
1263 kobject_del(&rdev->kobj);
1da177e4
LT		 1264}
1265
1266/*
1267 * prevent the device from being mounted, repartitioned or
1268 * otherwise reused by a RAID array (or any other kernel
1269 * subsystem), by bd_claiming the device.
1270 */
1271static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1272{
1273 int err = 0;
1274 struct block_device *bdev;
1275 char b[BDEVNAME_SIZE];
1276
1277 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1278 if (IS_ERR(bdev)) {
1279 printk(KERN_ERR "md: could not open %s.\n",
1280 __bdevname(dev, b));
1281 return PTR_ERR(bdev);
1282 }
1283 err = bd_claim(bdev, rdev);
1284 if (err) {
1285 printk(KERN_ERR "md: could not bd_claim %s.\n",
1286 bdevname(bdev, b));
1287 blkdev_put(bdev);
1288 return err;
1289 }
1290 rdev->bdev = bdev;
1291 return err;
1292}
1293
1294static void unlock_rdev(mdk_rdev_t *rdev)
1295{
1296 struct block_device *bdev = rdev->bdev;
1297 rdev->bdev = NULL;
1298 if (!bdev)
1299 MD_BUG();
1300 bd_release(bdev);
1301 blkdev_put(bdev);
1302}
1303
1304void md_autodetect_dev(dev_t dev);
1305
1306static void export_rdev(mdk_rdev_t * rdev)
1307{
1308 char b[BDEVNAME_SIZE];
1309 printk(KERN_INFO "md: export_rdev(%s)\n",
1310 bdevname(rdev->bdev,b));
1311 if (rdev->mddev)
1312 MD_BUG();
1313 free_disk_sb(rdev);
1314 list_del_init(&rdev->same_set);
1315#ifndef MODULE
1316 md_autodetect_dev(rdev->bdev->bd_dev);
1317#endif
1318 unlock_rdev(rdev);
86e6ffdd 1319 kobject_put(&rdev->kobj);
1da177e4
LT		 1320}
1321
1322static void kick_rdev_from_array(mdk_rdev_t * rdev)
1323{
1324 unbind_rdev_from_array(rdev);
1325 export_rdev(rdev);
1326}
1327
1328static void export_array(mddev_t *mddev)
1329{
1330 struct list_head *tmp;
1331 mdk_rdev_t *rdev;
1332
1333 ITERATE_RDEV(mddev,rdev,tmp) {
1334 if (!rdev->mddev) {
1335 MD_BUG();
1336 continue;
1337 }
1338 kick_rdev_from_array(rdev);
1339 }
1340 if (!list_empty(&mddev->disks))
1341 MD_BUG();
1342 mddev->raid_disks = 0;
1343 mddev->major_version = 0;
1344}
1345
1346static void print_desc(mdp_disk_t *desc)
1347{
1348 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1349 desc->major,desc->minor,desc->raid_disk,desc->state);
1350}
1351
1352static void print_sb(mdp_super_t *sb)
1353{
1354 int i;
1355
1356 printk(KERN_INFO
1357 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1358 sb->major_version, sb->minor_version, sb->patch_version,
1359 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1360 sb->ctime);
1361 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1362 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1363 sb->md_minor, sb->layout, sb->chunk_size);
1364 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1365 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1366 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1367 sb->failed_disks, sb->spare_disks,
1368 sb->sb_csum, (unsigned long)sb->events_lo);
1369
1370 printk(KERN_INFO);
1371 for (i = 0; i < MD_SB_DISKS; i++) {
1372 mdp_disk_t *desc;
1373
1374 desc = sb->disks + i;
1375 if (desc->number || desc->major || desc->minor ||
1376 desc->raid_disk || (desc->state && (desc->state != 4))) {
1377 printk(" D %2d: ", i);
1378 print_desc(desc);
1379 }
1380 }
1381 printk(KERN_INFO "md: THIS: ");
1382 print_desc(&sb->this_disk);
1383
1384}
1385
1386static void print_rdev(mdk_rdev_t *rdev)
1387{
1388 char b[BDEVNAME_SIZE];
1389 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1390 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
b2d444d7
N		 1391 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1392 rdev->desc_nr);
1da177e4
LT		 1393 if (rdev->sb_loaded) {
1394 printk(KERN_INFO "md: rdev superblock:\n");
1395 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1396 } else
1397 printk(KERN_INFO "md: no rdev superblock!\n");
1398}
1399
1400void md_print_devices(void)
1401{
1402 struct list_head *tmp, *tmp2;
1403 mdk_rdev_t *rdev;
1404 mddev_t *mddev;
1405 char b[BDEVNAME_SIZE];
1406
1407 printk("\n");
1408 printk("md: **********************************\n");
1409 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1410 printk("md: **********************************\n");
1411 ITERATE_MDDEV(mddev,tmp) {
1da177e4 1412
32a7627c
N		 1413 if (mddev->bitmap)
1414 bitmap_print_sb(mddev->bitmap);
1415 else
1416 printk("%s: ", mdname(mddev));
1da177e4
LT		 1417 ITERATE_RDEV(mddev,rdev,tmp2)
1418 printk("<%s>", bdevname(rdev->bdev,b));
1419 printk("\n");
1420
1421 ITERATE_RDEV(mddev,rdev,tmp2)
1422 print_rdev(rdev);
1423 }
1424 printk("md: **********************************\n");
1425 printk("\n");
1426}
1427
1428
1da177e4
LT		 1429static void sync_sbs(mddev_t * mddev)
1430{
1431 mdk_rdev_t *rdev;
1432 struct list_head *tmp;
1433
1434 ITERATE_RDEV(mddev,rdev,tmp) {
1435 super_types[mddev->major_version].
1436 sync_super(mddev, rdev);
1437 rdev->sb_loaded = 1;
1438 }
1439}
1440
1441static void md_update_sb(mddev_t * mddev)
1442{
7bfa19f2 1443 int err;
1da177e4
LT		 1444 struct list_head *tmp;
1445 mdk_rdev_t *rdev;
06d91a5f 1446 int sync_req;
1da177e4 1447
1da177e4 1448repeat:
a9701a30 1449 spin_lock_irq(&mddev->write_lock);
06d91a5f 1450 sync_req = mddev->in_sync;
1da177e4
LT		 1451 mddev->utime = get_seconds();
1452 mddev->events ++;
1453
1454 if (!mddev->events) {
1455 /*
1456 * oops, this 64-bit counter should never wrap.
1457 * Either we are in around ~1 trillion A.C., assuming
1458 * 1 reboot per second, or we have a bug:
1459 */
1460 MD_BUG();
1461 mddev->events --;
1462 }
7bfa19f2 1463 mddev->sb_dirty = 2;
1da177e4
LT		 1464 sync_sbs(mddev);
1465
1466 /*
1467 * do not write anything to disk if using
1468 * nonpersistent superblocks
1469 */
06d91a5f
N		 1470 if (!mddev->persistent) {
1471 mddev->sb_dirty = 0;
a9701a30 1472 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1473 wake_up(&mddev->sb_wait);
1da177e4 1474 return;
06d91a5f 1475 }
a9701a30 1476 spin_unlock_irq(&mddev->write_lock);
1da177e4
LT		 1477
1478 dprintk(KERN_INFO
1479 "md: updating %s RAID superblock on device (in sync %d)\n",
1480 mdname(mddev),mddev->in_sync);
1481
32a7627c 1482 err = bitmap_update_sb(mddev->bitmap);
1da177e4
LT		 1483 ITERATE_RDEV(mddev,rdev,tmp) {
1484 char b[BDEVNAME_SIZE];
1485 dprintk(KERN_INFO "md: ");
b2d444d7 1486 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 1487 dprintk("(skipping faulty ");
1488
1489 dprintk("%s ", bdevname(rdev->bdev,b));
b2d444d7 1490 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 1491 md_super_write(mddev,rdev,
0002b271 1492 rdev->sb_offset<<1, rdev->sb_size,
7bfa19f2
N		 1493 rdev->sb_page);
1494 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1495 bdevname(rdev->bdev,b),
1496 (unsigned long long)rdev->sb_offset);
1497
1da177e4
LT		 1498 } else
1499 dprintk(")\n");
7bfa19f2 1500 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT		 1501 /* only need to write one superblock... */
1502 break;
1503 }
a9701a30 1504 md_super_wait(mddev);
7bfa19f2
N		 1505 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1506
a9701a30 1507 spin_lock_irq(&mddev->write_lock);
7bfa19f2 1508 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
06d91a5f 1509 /* have to write it out again */
a9701a30 1510 spin_unlock_irq(&mddev->write_lock);
06d91a5f
N		 1511 goto repeat;
1512 }
1513 mddev->sb_dirty = 0;
a9701a30 1514 spin_unlock_irq(&mddev->write_lock);
3d310eb7 1515 wake_up(&mddev->sb_wait);
06d91a5f 1516
1da177e4
LT		 1517}
1518
86e6ffdd
N		 1519struct rdev_sysfs_entry {
1520 struct attribute attr;
1521 ssize_t (*show)(mdk_rdev_t *, char *);
1522 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1523};
1524
1525static ssize_t
96de1e66 1526state_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1527{
1528 char *sep = "";
1529 int len=0;
1530
b2d444d7 1531 if (test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 1532 len+= sprintf(page+len, "%sfaulty",sep);
1533 sep = ",";
1534 }
b2d444d7 1535 if (test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1536 len += sprintf(page+len, "%sin_sync",sep);
1537 sep = ",";
1538 }
b2d444d7
N		 1539 if (!test_bit(Faulty, &rdev->flags) &&
1540 !test_bit(In_sync, &rdev->flags)) {
86e6ffdd
N		 1541 len += sprintf(page+len, "%sspare", sep);
1542 sep = ",";
1543 }
1544 return len+sprintf(page+len, "\n");
1545}
1546
96de1e66
N		 1547static struct rdev_sysfs_entry
1548rdev_state = __ATTR_RO(state);
86e6ffdd
N		 1549
1550static ssize_t
96de1e66 1551super_show(mdk_rdev_t *rdev, char *page)
86e6ffdd
N		 1552{
1553 if (rdev->sb_loaded && rdev->sb_size) {
1554 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1555 return rdev->sb_size;
1556 } else
1557 return 0;
1558}
96de1e66
N		 1559static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1560
86e6ffdd
N		 1561static struct attribute *rdev_default_attrs[] = {
1562 &rdev_state.attr,
1563 &rdev_super.attr,
1564 NULL,
1565};
1566static ssize_t
1567rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1568{
1569 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1570 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1571
1572 if (!entry->show)
1573 return -EIO;
1574 return entry->show(rdev, page);
1575}
1576
1577static ssize_t
1578rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1579 const char *page, size_t length)
1580{
1581 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1582 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1583
1584 if (!entry->store)
1585 return -EIO;
1586 return entry->store(rdev, page, length);
1587}
1588
1589static void rdev_free(struct kobject *ko)
1590{
1591 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1592 kfree(rdev);
1593}
1594static struct sysfs_ops rdev_sysfs_ops = {
1595 .show = rdev_attr_show,
1596 .store = rdev_attr_store,
1597};
1598static struct kobj_type rdev_ktype = {
1599 .release = rdev_free,
1600 .sysfs_ops = &rdev_sysfs_ops,
1601 .default_attrs = rdev_default_attrs,
1602};
1603
1da177e4
LT		 1604/*
1605 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1606 *
1607 * mark the device faulty if:
1608 *
1609 * - the device is nonexistent (zero size)
1610 * - the device has no valid superblock
1611 *
1612 * a faulty rdev _never_ has rdev->sb set.
1613 */
1614static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1615{
1616 char b[BDEVNAME_SIZE];
1617 int err;
1618 mdk_rdev_t *rdev;
1619 sector_t size;
1620
9ffae0cf 1621 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1da177e4
LT		 1622 if (!rdev) {
1623 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1624 return ERR_PTR(-ENOMEM);
1625 }
1da177e4
LT		 1626
1627 if ((err = alloc_disk_sb(rdev)))
1628 goto abort_free;
1629
1630 err = lock_rdev(rdev, newdev);
1631 if (err)
1632 goto abort_free;
1633
86e6ffdd
N		 1634 rdev->kobj.parent = NULL;
1635 rdev->kobj.ktype = &rdev_ktype;
1636 kobject_init(&rdev->kobj);
1637
1da177e4 1638 rdev->desc_nr = -1;
b2d444d7 1639 rdev->flags = 0;
1da177e4
LT		 1640 rdev->data_offset = 0;
1641 atomic_set(&rdev->nr_pending, 0);
ba22dcbf 1642 atomic_set(&rdev->read_errors, 0);
1da177e4
LT		 1643
1644 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
1645 if (!size) {
1646 printk(KERN_WARNING
1647 "md: %s has zero or unknown size, marking faulty!\n",
1648 bdevname(rdev->bdev,b));
1649 err = -EINVAL;
1650 goto abort_free;
1651 }
1652
1653 if (super_format >= 0) {
1654 err = super_types[super_format].
1655 load_super(rdev, NULL, super_minor);
1656 if (err == -EINVAL) {
1657 printk(KERN_WARNING
1658 "md: %s has invalid sb, not importing!\n",
1659 bdevname(rdev->bdev,b));
1660 goto abort_free;
1661 }
1662 if (err < 0) {
1663 printk(KERN_WARNING
1664 "md: could not read %s's sb, not importing!\n",
1665 bdevname(rdev->bdev,b));
1666 goto abort_free;
1667 }
1668 }
1669 INIT_LIST_HEAD(&rdev->same_set);
1670
1671 return rdev;
1672
1673abort_free:
1674 if (rdev->sb_page) {
1675 if (rdev->bdev)
1676 unlock_rdev(rdev);
1677 free_disk_sb(rdev);
1678 }
1679 kfree(rdev);
1680 return ERR_PTR(err);
1681}
1682
1683/*
1684 * Check a full RAID array for plausibility
1685 */
1686
1687
a757e64c 1688static void analyze_sbs(mddev_t * mddev)
1da177e4
LT		 1689{
1690 int i;
1691 struct list_head *tmp;
1692 mdk_rdev_t *rdev, *freshest;
1693 char b[BDEVNAME_SIZE];
1694
1695 freshest = NULL;
1696 ITERATE_RDEV(mddev,rdev,tmp)
1697 switch (super_types[mddev->major_version].
1698 load_super(rdev, freshest, mddev->minor_version)) {
1699 case 1:
1700 freshest = rdev;
1701 break;
1702 case 0:
1703 break;
1704 default:
1705 printk( KERN_ERR \
1706 "md: fatal superblock inconsistency in %s"
1707 " -- removing from array\n",
1708 bdevname(rdev->bdev,b));
1709 kick_rdev_from_array(rdev);
1710 }
1711
1712
1713 super_types[mddev->major_version].
1714 validate_super(mddev, freshest);
1715
1716 i = 0;
1717 ITERATE_RDEV(mddev,rdev,tmp) {
1718 if (rdev != freshest)
1719 if (super_types[mddev->major_version].
1720 validate_super(mddev, rdev)) {
1721 printk(KERN_WARNING "md: kicking non-fresh %s"
1722 " from array!\n",
1723 bdevname(rdev->bdev,b));
1724 kick_rdev_from_array(rdev);
1725 continue;
1726 }
1727 if (mddev->level == LEVEL_MULTIPATH) {
1728 rdev->desc_nr = i++;
1729 rdev->raid_disk = rdev->desc_nr;
b2d444d7 1730 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1731 }
1732 }
1733
1734
1735
1736 if (mddev->recovery_cp != MaxSector &&
1737 mddev->level >= 1)
1738 printk(KERN_ERR "md: %s: raid array is not clean"
1739 " -- starting background reconstruction\n",
1740 mdname(mddev));
1741
1da177e4
LT		 1742}
1743
eae1701f 1744static ssize_t
96de1e66 1745level_show(mddev_t *mddev, char *page)
eae1701f
N		 1746{
1747 mdk_personality_t *p = mddev->pers;
bb636547 1748 if (p == NULL && mddev->raid_disks == 0)
eae1701f
N		 1749 return 0;
1750 if (mddev->level >= 0)
bcb97940 1751 return sprintf(page, "raid%d\n", mddev->level);
eae1701f
N		 1752 else
1753 return sprintf(page, "%s\n", p->name);
1754}
1755
96de1e66 1756static struct md_sysfs_entry md_level = __ATTR_RO(level);
eae1701f
N		 1757
1758static ssize_t
96de1e66 1759raid_disks_show(mddev_t *mddev, char *page)
eae1701f 1760{
bb636547
N		 1761 if (mddev->raid_disks == 0)
1762 return 0;
eae1701f
N		 1763 return sprintf(page, "%d\n", mddev->raid_disks);
1764}
1765
96de1e66 1766static struct md_sysfs_entry md_raid_disks = __ATTR_RO(raid_disks);
eae1701f 1767
24dd469d 1768static ssize_t
7eec314d 1769action_show(mddev_t *mddev, char *page)
24dd469d 1770{
7eec314d 1771 char *type = "idle";
31399d9e
N		 1772 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
1773 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
1774 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
24dd469d
N		 1775 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
1776 type = "resync";
1777 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
1778 type = "check";
1779 else
1780 type = "repair";
1781 } else
1782 type = "recover";
1783 }
1784 return sprintf(page, "%s\n", type);
1785}
1786
1787static ssize_t
7eec314d 1788action_store(mddev_t *mddev, const char *page, size_t len)
24dd469d 1789{
7eec314d
N		 1790 if (!mddev->pers || !mddev->pers->sync_request)
1791 return -EINVAL;
1792
1793 if (strcmp(page, "idle")==0 || strcmp(page, "idle\n")==0) {
1794 if (mddev->sync_thread) {
1795 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1796 md_unregister_thread(mddev->sync_thread);
1797 mddev->sync_thread = NULL;
1798 mddev->recovery = 0;
1799 }
1800 return len;
1801 }
31399d9e
N		 1802
1803 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
1804 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
24dd469d 1805 return -EBUSY;
7eec314d
N		 1806 if (strcmp(page, "resync")==0 || strcmp(page, "resync\n")==0 ||
1807 strcmp(page, "recover")==0 || strcmp(page, "recover\n")==0)
1808 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
1809 else {
1810 if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0)
1811 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
1812 else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0)
1813 return -EINVAL;
1814 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
1815 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
1816 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
1817 }
24dd469d
N		 1818 md_wakeup_thread(mddev->thread);
1819 return len;
1820}
1821
9d88883e 1822static ssize_t
96de1e66 1823mismatch_cnt_show(mddev_t *mddev, char *page)
9d88883e
N		 1824{
1825 return sprintf(page, "%llu\n",
1826 (unsigned long long) mddev->resync_mismatches);
1827}
1828
96de1e66 1829static struct md_sysfs_entry
7eec314d 1830md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
24dd469d 1831
96de1e66
N		 1832
1833static struct md_sysfs_entry
1834md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 1835
eae1701f
N		 1836static struct attribute *md_default_attrs[] = {
1837 &md_level.attr,
1838 &md_raid_disks.attr,
411036fa
N		 1839 NULL,
1840};
1841
1842static struct attribute *md_redundancy_attrs[] = {
24dd469d 1843 &md_scan_mode.attr,
9d88883e 1844 &md_mismatches.attr,
eae1701f
N		 1845 NULL,
1846};
411036fa
N		 1847static struct attribute_group md_redundancy_group = {
1848 .name = NULL,
1849 .attrs = md_redundancy_attrs,
1850};
1851
eae1701f
N		 1852
1853static ssize_t
1854md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1855{
1856 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
1857 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 1858 ssize_t rv;
eae1701f
N		 1859
1860 if (!entry->show)
1861 return -EIO;
96de1e66
N		 1862 mddev_lock(mddev);
1863 rv = entry->show(mddev, page);
1864 mddev_unlock(mddev);
1865 return rv;
eae1701f
N		 1866}
1867
1868static ssize_t
1869md_attr_store(struct kobject *kobj, struct attribute *attr,
1870 const char *page, size_t length)
1871{
1872 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
1873 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
96de1e66 1874 ssize_t rv;
eae1701f
N		 1875
1876 if (!entry->store)
1877 return -EIO;
96de1e66
N		 1878 mddev_lock(mddev);
1879 rv = entry->store(mddev, page, length);
1880 mddev_unlock(mddev);
1881 return rv;
eae1701f
N		 1882}
1883
1884static void md_free(struct kobject *ko)
1885{
1886 mddev_t *mddev = container_of(ko, mddev_t, kobj);
1887 kfree(mddev);
1888}
1889
1890static struct sysfs_ops md_sysfs_ops = {
1891 .show = md_attr_show,
1892 .store = md_attr_store,
1893};
1894static struct kobj_type md_ktype = {
1895 .release = md_free,
1896 .sysfs_ops = &md_sysfs_ops,
1897 .default_attrs = md_default_attrs,
1898};
1899
1da177e4
LT		 1900int mdp_major = 0;
1901
1902static struct kobject *md_probe(dev_t dev, int *part, void *data)
1903{
1904 static DECLARE_MUTEX(disks_sem);
1905 mddev_t *mddev = mddev_find(dev);
1906 struct gendisk *disk;
1907 int partitioned = (MAJOR(dev) != MD_MAJOR);
1908 int shift = partitioned ? MdpMinorShift : 0;
1909 int unit = MINOR(dev) >> shift;
1910
1911 if (!mddev)
1912 return NULL;
1913
1914 down(&disks_sem);
1915 if (mddev->gendisk) {
1916 up(&disks_sem);
1917 mddev_put(mddev);
1918 return NULL;
1919 }
1920 disk = alloc_disk(1 << shift);
1921 if (!disk) {
1922 up(&disks_sem);
1923 mddev_put(mddev);
1924 return NULL;
1925 }
1926 disk->major = MAJOR(dev);
1927 disk->first_minor = unit << shift;
1928 if (partitioned) {
1929 sprintf(disk->disk_name, "md_d%d", unit);
1930 sprintf(disk->devfs_name, "md/d%d", unit);
1931 } else {
1932 sprintf(disk->disk_name, "md%d", unit);
1933 sprintf(disk->devfs_name, "md/%d", unit);
1934 }
1935 disk->fops = &md_fops;
1936 disk->private_data = mddev;
1937 disk->queue = mddev->queue;
1938 add_disk(disk);
1939 mddev->gendisk = disk;
1940 up(&disks_sem);
9c791977 1941 mddev->kobj.parent = &disk->kobj;
eae1701f
N		 1942 mddev->kobj.k_name = NULL;
1943 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
1944 mddev->kobj.ktype = &md_ktype;
1945 kobject_register(&mddev->kobj);
1da177e4
LT		 1946 return NULL;
1947}
1948
1949void md_wakeup_thread(mdk_thread_t *thread);
1950
1951static void md_safemode_timeout(unsigned long data)
1952{
1953 mddev_t *mddev = (mddev_t *) data;
1954
1955 mddev->safemode = 1;
1956 md_wakeup_thread(mddev->thread);
1957}
1958
6ff8d8ec 1959static int start_dirty_degraded;
1da177e4
LT		 1960
1961static int do_md_run(mddev_t * mddev)
1962{
1963 int pnum, err;
1964 int chunk_size;
1965 struct list_head *tmp;
1966 mdk_rdev_t *rdev;
1967 struct gendisk *disk;
1968 char b[BDEVNAME_SIZE];
1969
a757e64c
N		 1970 if (list_empty(&mddev->disks))
1971 /* cannot run an array with no devices.. */
1da177e4 1972 return -EINVAL;
1da177e4
LT		 1973
1974 if (mddev->pers)
1975 return -EBUSY;
1976
1977 /*
1978 * Analyze all RAID superblock(s)
1979 */
a757e64c
N		 1980 if (!mddev->raid_disks)
1981 analyze_sbs(mddev);
1da177e4
LT		 1982
1983 chunk_size = mddev->chunk_size;
1984 pnum = level_to_pers(mddev->level);
1985
1986 if ((pnum != MULTIPATH) && (pnum != RAID1)) {
1987 if (!chunk_size) {
1988 /*
1989 * 'default chunksize' in the old md code used to
1990 * be PAGE_SIZE, baaad.
1991 * we abort here to be on the safe side. We don't
1992 * want to continue the bad practice.
1993 */
1994 printk(KERN_ERR
1995 "no chunksize specified, see 'man raidtab'\n");
1996 return -EINVAL;
1997 }
1998 if (chunk_size > MAX_CHUNK_SIZE) {
1999 printk(KERN_ERR "too big chunk_size: %d > %d\n",
2000 chunk_size, MAX_CHUNK_SIZE);
2001 return -EINVAL;
2002 }
2003 /*
2004 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2005 */
2006 if ( (1 << ffz(~chunk_size)) != chunk_size) {
a757e64c 2007 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1da177e4
LT		 2008 return -EINVAL;
2009 }
2010 if (chunk_size < PAGE_SIZE) {
2011 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
2012 chunk_size, PAGE_SIZE);
2013 return -EINVAL;
2014 }
2015
2016 /* devices must have minimum size of one chunk */
2017 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2018 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2019 continue;
2020 if (rdev->size < chunk_size / 1024) {
2021 printk(KERN_WARNING
2022 "md: Dev %s smaller than chunk_size:"
2023 " %lluk < %dk\n",
2024 bdevname(rdev->bdev,b),
2025 (unsigned long long)rdev->size,
2026 chunk_size / 1024);
2027 return -EINVAL;
2028 }
2029 }
2030 }
2031
1da177e4
LT		 2032#ifdef CONFIG_KMOD
2033 if (!pers[pnum])
2034 {
2035 request_module("md-personality-%d", pnum);
2036 }
2037#endif
2038
2039 /*
2040 * Drop all container device buffers, from now on
2041 * the only valid external interface is through the md
2042 * device.
2043 * Also find largest hardsector size
2044 */
2045 ITERATE_RDEV(mddev,rdev,tmp) {
b2d444d7 2046 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2047 continue;
2048 sync_blockdev(rdev->bdev);
2049 invalidate_bdev(rdev->bdev, 0);
2050 }
2051
2052 md_probe(mddev->unit, NULL, NULL);
2053 disk = mddev->gendisk;
2054 if (!disk)
2055 return -ENOMEM;
2056
2057 spin_lock(&pers_lock);
2058 if (!pers[pnum] || !try_module_get(pers[pnum]->owner)) {
2059 spin_unlock(&pers_lock);
2060 printk(KERN_WARNING "md: personality %d is not loaded!\n",
2061 pnum);
2062 return -EINVAL;
2063 }
2064
2065 mddev->pers = pers[pnum];
2066 spin_unlock(&pers_lock);
2067
657390d2 2068 mddev->recovery = 0;
1da177e4 2069 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
a9701a30 2070 mddev->barriers_work = 1;
6ff8d8ec 2071 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 2072
f91de92e
N		 2073 if (start_readonly)
2074 mddev->ro = 2; /* read-only, but switch on first write */
2075
b15c2e57
N		 2076 err = mddev->pers->run(mddev);
2077 if (!err && mddev->pers->sync_request) {
2078 err = bitmap_create(mddev);
2079 if (err) {
2080 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
2081 mdname(mddev), err);
2082 mddev->pers->stop(mddev);
2083 }
2084 }
1da177e4
LT		 2085 if (err) {
2086 printk(KERN_ERR "md: pers->run() failed ...\n");
2087 module_put(mddev->pers->owner);
2088 mddev->pers = NULL;
32a7627c
N		 2089 bitmap_destroy(mddev);
2090 return err;
1da177e4 2091 }
411036fa
N		 2092 if (mddev->pers->sync_request)
2093 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
fd9d49ca
N		 2094 else if (mddev->ro == 2) /* auto-readonly not meaningful */
2095 mddev->ro = 0;
2096
1da177e4
LT		 2097 atomic_set(&mddev->writes_pending,0);
2098 mddev->safemode = 0;
2099 mddev->safemode_timer.function = md_safemode_timeout;
2100 mddev->safemode_timer.data = (unsigned long) mddev;
2101 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */
2102 mddev->in_sync = 1;
86e6ffdd
N		 2103
2104 ITERATE_RDEV(mddev,rdev,tmp)
2105 if (rdev->raid_disk >= 0) {
2106 char nm[20];
2107 sprintf(nm, "rd%d", rdev->raid_disk);
2108 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2109 }
1da177e4
LT		 2110
2111 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 2112 md_wakeup_thread(mddev->thread);
1da177e4
LT		 2113
2114 if (mddev->sb_dirty)
2115 md_update_sb(mddev);
2116
2117 set_capacity(disk, mddev->array_size<<1);
2118
2119 /* If we call blk_queue_make_request here, it will
2120 * re-initialise max_sectors etc which may have been
2121 * refined inside -> run. So just set the bits we need to set.
2122 * Most initialisation happended when we called
2123 * blk_queue_make_request(..., md_fail_request)
2124 * earlier.
2125 */
2126 mddev->queue->queuedata = mddev;
2127 mddev->queue->make_request_fn = mddev->pers->make_request;
2128
2129 mddev->changed = 1;
d7603b7e 2130 md_new_event(mddev);
1da177e4
LT		 2131 return 0;
2132}
2133
2134static int restart_array(mddev_t *mddev)
2135{
2136 struct gendisk *disk = mddev->gendisk;
2137 int err;
2138
2139 /*
2140 * Complain if it has no devices
2141 */
2142 err = -ENXIO;
2143 if (list_empty(&mddev->disks))
2144 goto out;
2145
2146 if (mddev->pers) {
2147 err = -EBUSY;
2148 if (!mddev->ro)
2149 goto out;
2150
2151 mddev->safemode = 0;
2152 mddev->ro = 0;
2153 set_disk_ro(disk, 0);
2154
2155 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2156 mdname(mddev));
2157 /*
2158 * Kick recovery or resync if necessary
2159 */
2160 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2161 md_wakeup_thread(mddev->thread);
2162 err = 0;
2163 } else {
2164 printk(KERN_ERR "md: %s has no personality assigned.\n",
2165 mdname(mddev));
2166 err = -EINVAL;
2167 }
2168
2169out:
2170 return err;
2171}
2172
2173static int do_md_stop(mddev_t * mddev, int ro)
2174{
2175 int err = 0;
2176 struct gendisk *disk = mddev->gendisk;
2177
2178 if (mddev->pers) {
2179 if (atomic_read(&mddev->active)>2) {
2180 printk("md: %s still in use.\n",mdname(mddev));
2181 return -EBUSY;
2182 }
2183
2184 if (mddev->sync_thread) {
2185 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2186 md_unregister_thread(mddev->sync_thread);
2187 mddev->sync_thread = NULL;
2188 }
2189
2190 del_timer_sync(&mddev->safemode_timer);
2191
2192 invalidate_partition(disk, 0);
2193
2194 if (ro) {
2195 err = -ENXIO;
f91de92e 2196 if (mddev->ro==1)
1da177e4
LT		 2197 goto out;
2198 mddev->ro = 1;
2199 } else {
6b8b3e8a 2200 bitmap_flush(mddev);
a9701a30 2201 md_super_wait(mddev);
1da177e4
LT		 2202 if (mddev->ro)
2203 set_disk_ro(disk, 0);
2204 blk_queue_make_request(mddev->queue, md_fail_request);
2205 mddev->pers->stop(mddev);
411036fa
N		 2206 if (mddev->pers->sync_request)
2207 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
2208
1da177e4
LT		 2209 module_put(mddev->pers->owner);
2210 mddev->pers = NULL;
2211 if (mddev->ro)
2212 mddev->ro = 0;
2213 }
2214 if (!mddev->in_sync) {
2215 /* mark array as shutdown cleanly */
2216 mddev->in_sync = 1;
2217 md_update_sb(mddev);
2218 }
2219 if (ro)
2220 set_disk_ro(disk, 1);
2221 }
32a7627c
N		 2222
2223 bitmap_destroy(mddev);
2224 if (mddev->bitmap_file) {
2225 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
2226 fput(mddev->bitmap_file);
2227 mddev->bitmap_file = NULL;
2228 }
9223214e 2229 mddev->bitmap_offset = 0;
32a7627c 2230
1da177e4
LT		 2231 /*
2232 * Free resources if final stop
2233 */
2234 if (!ro) {
86e6ffdd
N		 2235 mdk_rdev_t *rdev;
2236 struct list_head *tmp;
1da177e4
LT		 2237 struct gendisk *disk;
2238 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
2239
86e6ffdd
N		 2240 ITERATE_RDEV(mddev,rdev,tmp)
2241 if (rdev->raid_disk >= 0) {
2242 char nm[20];
2243 sprintf(nm, "rd%d", rdev->raid_disk);
2244 sysfs_remove_link(&mddev->kobj, nm);
2245 }
2246
1da177e4
LT		 2247 export_array(mddev);
2248
2249 mddev->array_size = 0;
2250 disk = mddev->gendisk;
2251 if (disk)
2252 set_capacity(disk, 0);
2253 mddev->changed = 1;
2254 } else
2255 printk(KERN_INFO "md: %s switched to read-only mode.\n",
2256 mdname(mddev));
2257 err = 0;
d7603b7e 2258 md_new_event(mddev);
1da177e4
LT		 2259out:
2260 return err;
2261}
2262
2263static void autorun_array(mddev_t *mddev)
2264{
2265 mdk_rdev_t *rdev;
2266 struct list_head *tmp;
2267 int err;
2268
a757e64c 2269 if (list_empty(&mddev->disks))
1da177e4 2270 return;
1da177e4
LT		 2271
2272 printk(KERN_INFO "md: running: ");
2273
2274 ITERATE_RDEV(mddev,rdev,tmp) {
2275 char b[BDEVNAME_SIZE];
2276 printk("<%s>", bdevname(rdev->bdev,b));
2277 }
2278 printk("\n");
2279
2280 err = do_md_run (mddev);
2281 if (err) {
2282 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
2283 do_md_stop (mddev, 0);
2284 }
2285}
2286
2287/*
2288 * lets try to run arrays based on all disks that have arrived
2289 * until now. (those are in pending_raid_disks)
2290 *
2291 * the method: pick the first pending disk, collect all disks with
2292 * the same UUID, remove all from the pending list and put them into
2293 * the 'same_array' list. Then order this list based on superblock
2294 * update time (freshest comes first), kick out 'old' disks and
2295 * compare superblocks. If everything's fine then run it.
2296 *
2297 * If "unit" is allocated, then bump its reference count
2298 */
2299static void autorun_devices(int part)
2300{
2301 struct list_head candidates;
2302 struct list_head *tmp;
2303 mdk_rdev_t *rdev0, *rdev;
2304 mddev_t *mddev;
2305 char b[BDEVNAME_SIZE];
2306
2307 printk(KERN_INFO "md: autorun ...\n");
2308 while (!list_empty(&pending_raid_disks)) {
2309 dev_t dev;
2310 rdev0 = list_entry(pending_raid_disks.next,
2311 mdk_rdev_t, same_set);
2312
2313 printk(KERN_INFO "md: considering %s ...\n",
2314 bdevname(rdev0->bdev,b));
2315 INIT_LIST_HEAD(&candidates);
2316 ITERATE_RDEV_PENDING(rdev,tmp)
2317 if (super_90_load(rdev, rdev0, 0) >= 0) {
2318 printk(KERN_INFO "md: adding %s ...\n",
2319 bdevname(rdev->bdev,b));
2320 list_move(&rdev->same_set, &candidates);
2321 }
2322 /*
2323 * now we have a set of devices, with all of them having
2324 * mostly sane superblocks. It's time to allocate the
2325 * mddev.
2326 */
2327 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
2328 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
2329 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
2330 break;
2331 }
2332 if (part)
2333 dev = MKDEV(mdp_major,
2334 rdev0->preferred_minor << MdpMinorShift);
2335 else
2336 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
2337
2338 md_probe(dev, NULL, NULL);
2339 mddev = mddev_find(dev);
2340 if (!mddev) {
2341 printk(KERN_ERR
2342 "md: cannot allocate memory for md drive.\n");
2343 break;
2344 }
2345 if (mddev_lock(mddev))
2346 printk(KERN_WARNING "md: %s locked, cannot run\n",
2347 mdname(mddev));
2348 else if (mddev->raid_disks || mddev->major_version
2349 || !list_empty(&mddev->disks)) {
2350 printk(KERN_WARNING
2351 "md: %s already running, cannot run %s\n",
2352 mdname(mddev), bdevname(rdev0->bdev,b));
2353 mddev_unlock(mddev);
2354 } else {
2355 printk(KERN_INFO "md: created %s\n", mdname(mddev));
2356 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
2357 list_del_init(&rdev->same_set);
2358 if (bind_rdev_to_array(rdev, mddev))
2359 export_rdev(rdev);
2360 }
2361 autorun_array(mddev);
2362 mddev_unlock(mddev);
2363 }
2364 /* on success, candidates will be empty, on error
2365 * it won't...
2366 */
2367 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
2368 export_rdev(rdev);
2369 mddev_put(mddev);
2370 }
2371 printk(KERN_INFO "md: ... autorun DONE.\n");
2372}
2373
2374/*
2375 * import RAID devices based on one partition
2376 * if possible, the array gets run as well.
2377 */
2378
2379static int autostart_array(dev_t startdev)
2380{
2381 char b[BDEVNAME_SIZE];
2382 int err = -EINVAL, i;
2383 mdp_super_t *sb = NULL;
2384 mdk_rdev_t *start_rdev = NULL, *rdev;
2385
2386 start_rdev = md_import_device(startdev, 0, 0);
2387 if (IS_ERR(start_rdev))
2388 return err;
2389
2390
2391 /* NOTE: this can only work for 0.90.0 superblocks */
2392 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
2393 if (sb->major_version != 0 ||
2394 sb->minor_version != 90 ) {
2395 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
2396 export_rdev(start_rdev);
2397 return err;
2398 }
2399
b2d444d7 2400 if (test_bit(Faulty, &start_rdev->flags)) {
1da177e4
LT		 2401 printk(KERN_WARNING
2402 "md: can not autostart based on faulty %s!\n",
2403 bdevname(start_rdev->bdev,b));
2404 export_rdev(start_rdev);
2405 return err;
2406 }
2407 list_add(&start_rdev->same_set, &pending_raid_disks);
2408
2409 for (i = 0; i < MD_SB_DISKS; i++) {
2410 mdp_disk_t *desc = sb->disks + i;
2411 dev_t dev = MKDEV(desc->major, desc->minor);
2412
2413 if (!dev)
2414 continue;
2415 if (dev == startdev)
2416 continue;
2417 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
2418 continue;
2419 rdev = md_import_device(dev, 0, 0);
2420 if (IS_ERR(rdev))
2421 continue;
2422
2423 list_add(&rdev->same_set, &pending_raid_disks);
2424 }
2425
2426 /*
2427 * possibly return codes
2428 */
2429 autorun_devices(0);
2430 return 0;
2431
2432}
2433
2434
2435static int get_version(void __user * arg)
2436{
2437 mdu_version_t ver;
2438
2439 ver.major = MD_MAJOR_VERSION;
2440 ver.minor = MD_MINOR_VERSION;
2441 ver.patchlevel = MD_PATCHLEVEL_VERSION;
2442
2443 if (copy_to_user(arg, &ver, sizeof(ver)))
2444 return -EFAULT;
2445
2446 return 0;
2447}
2448
2449static int get_array_info(mddev_t * mddev, void __user * arg)
2450{
2451 mdu_array_info_t info;
2452 int nr,working,active,failed,spare;
2453 mdk_rdev_t *rdev;
2454 struct list_head *tmp;
2455
2456 nr=working=active=failed=spare=0;
2457 ITERATE_RDEV(mddev,rdev,tmp) {
2458 nr++;
b2d444d7 2459 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 2460 failed++;
2461 else {
2462 working++;
b2d444d7 2463 if (test_bit(In_sync, &rdev->flags))
1da177e4
LT		 2464 active++;
2465 else
2466 spare++;
2467 }
2468 }
2469
2470 info.major_version = mddev->major_version;
2471 info.minor_version = mddev->minor_version;
2472 info.patch_version = MD_PATCHLEVEL_VERSION;
2473 info.ctime = mddev->ctime;
2474 info.level = mddev->level;
2475 info.size = mddev->size;
2476 info.nr_disks = nr;
2477 info.raid_disks = mddev->raid_disks;
2478 info.md_minor = mddev->md_minor;
2479 info.not_persistent= !mddev->persistent;
2480
2481 info.utime = mddev->utime;
2482 info.state = 0;
2483 if (mddev->in_sync)
2484 info.state = (1<<MD_SB_CLEAN);
36fa3063
N		 2485 if (mddev->bitmap && mddev->bitmap_offset)
2486 info.state = (1<<MD_SB_BITMAP_PRESENT);
1da177e4
LT		 2487 info.active_disks = active;
2488 info.working_disks = working;
2489 info.failed_disks = failed;
2490 info.spare_disks = spare;
2491
2492 info.layout = mddev->layout;
2493 info.chunk_size = mddev->chunk_size;
2494
2495 if (copy_to_user(arg, &info, sizeof(info)))
2496 return -EFAULT;
2497
2498 return 0;
2499}
2500
87162a28 2501static int get_bitmap_file(mddev_t * mddev, void __user * arg)
32a7627c
N		 2502{
2503 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
2504 char *ptr, *buf = NULL;
2505 int err = -ENOMEM;
2506
2507 file = kmalloc(sizeof(*file), GFP_KERNEL);
2508 if (!file)
2509 goto out;
2510
2511 /* bitmap disabled, zero the first byte and copy out */
2512 if (!mddev->bitmap || !mddev->bitmap->file) {
2513 file->pathname[0] = '\0';
2514 goto copy_out;
2515 }
2516
2517 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
2518 if (!buf)
2519 goto out;
2520
2521 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
2522 if (!ptr)
2523 goto out;
2524
2525 strcpy(file->pathname, ptr);
2526
2527copy_out:
2528 err = 0;
2529 if (copy_to_user(arg, file, sizeof(*file)))
2530 err = -EFAULT;
2531out:
2532 kfree(buf);
2533 kfree(file);
2534 return err;
2535}
2536
1da177e4
LT		 2537static int get_disk_info(mddev_t * mddev, void __user * arg)
2538{
2539 mdu_disk_info_t info;
2540 unsigned int nr;
2541 mdk_rdev_t *rdev;
2542
2543 if (copy_from_user(&info, arg, sizeof(info)))
2544 return -EFAULT;
2545
2546 nr = info.number;
2547
2548 rdev = find_rdev_nr(mddev, nr);
2549 if (rdev) {
2550 info.major = MAJOR(rdev->bdev->bd_dev);
2551 info.minor = MINOR(rdev->bdev->bd_dev);
2552 info.raid_disk = rdev->raid_disk;
2553 info.state = 0;
b2d444d7 2554 if (test_bit(Faulty, &rdev->flags))
1da177e4 2555 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 2556 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 2557 info.state |= (1<<MD_DISK_ACTIVE);
2558 info.state |= (1<<MD_DISK_SYNC);
2559 }
8ddf9efe
N		 2560 if (test_bit(WriteMostly, &rdev->flags))
2561 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 2562 } else {
2563 info.major = info.minor = 0;
2564 info.raid_disk = -1;
2565 info.state = (1<<MD_DISK_REMOVED);
2566 }
2567
2568 if (copy_to_user(arg, &info, sizeof(info)))
2569 return -EFAULT;
2570
2571 return 0;
2572}
2573
2574static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
2575{
2576 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
2577 mdk_rdev_t *rdev;
2578 dev_t dev = MKDEV(info->major,info->minor);
2579
2580 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
2581 return -EOVERFLOW;
2582
2583 if (!mddev->raid_disks) {
2584 int err;
2585 /* expecting a device which has a superblock */
2586 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
2587 if (IS_ERR(rdev)) {
2588 printk(KERN_WARNING
2589 "md: md_import_device returned %ld\n",
2590 PTR_ERR(rdev));
2591 return PTR_ERR(rdev);
2592 }
2593 if (!list_empty(&mddev->disks)) {
2594 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2595 mdk_rdev_t, same_set);
2596 int err = super_types[mddev->major_version]
2597 .load_super(rdev, rdev0, mddev->minor_version);
2598 if (err < 0) {
2599 printk(KERN_WARNING
2600 "md: %s has different UUID to %s\n",
2601 bdevname(rdev->bdev,b),
2602 bdevname(rdev0->bdev,b2));
2603 export_rdev(rdev);
2604 return -EINVAL;
2605 }
2606 }
2607 err = bind_rdev_to_array(rdev, mddev);
2608 if (err)
2609 export_rdev(rdev);
2610 return err;
2611 }
2612
2613 /*
2614 * add_new_disk can be used once the array is assembled
2615 * to add "hot spares". They must already have a superblock
2616 * written
2617 */
2618 if (mddev->pers) {
2619 int err;
2620 if (!mddev->pers->hot_add_disk) {
2621 printk(KERN_WARNING
2622 "%s: personality does not support diskops!\n",
2623 mdname(mddev));
2624 return -EINVAL;
2625 }
7b1e35f6
N		 2626 if (mddev->persistent)
2627 rdev = md_import_device(dev, mddev->major_version,
2628 mddev->minor_version);
2629 else
2630 rdev = md_import_device(dev, -1, -1);
1da177e4
LT		 2631 if (IS_ERR(rdev)) {
2632 printk(KERN_WARNING
2633 "md: md_import_device returned %ld\n",
2634 PTR_ERR(rdev));
2635 return PTR_ERR(rdev);
2636 }
41158c7e
N		 2637 /* set save_raid_disk if appropriate */
2638 if (!mddev->persistent) {
2639 if (info->state & (1<<MD_DISK_SYNC) &&
2640 info->raid_disk < mddev->raid_disks)
2641 rdev->raid_disk = info->raid_disk;
2642 else
2643 rdev->raid_disk = -1;
2644 } else
2645 super_types[mddev->major_version].
2646 validate_super(mddev, rdev);
2647 rdev->saved_raid_disk = rdev->raid_disk;
2648
b2d444d7 2649 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 2650 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
2651 set_bit(WriteMostly, &rdev->flags);
2652
1da177e4
LT		 2653 rdev->raid_disk = -1;
2654 err = bind_rdev_to_array(rdev, mddev);
2655 if (err)
2656 export_rdev(rdev);
c361777f
N		 2657
2658 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
005eca5e 2659 md_wakeup_thread(mddev->thread);
1da177e4
LT		 2660 return err;
2661 }
2662
2663 /* otherwise, add_new_disk is only allowed
2664 * for major_version==0 superblocks
2665 */
2666 if (mddev->major_version != 0) {
2667 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
2668 mdname(mddev));
2669 return -EINVAL;
2670 }
2671
2672 if (!(info->state & (1<<MD_DISK_FAULTY))) {
2673 int err;
2674 rdev = md_import_device (dev, -1, 0);
2675 if (IS_ERR(rdev)) {
2676 printk(KERN_WARNING
2677 "md: error, md_import_device() returned %ld\n",
2678 PTR_ERR(rdev));
2679 return PTR_ERR(rdev);
2680 }
2681 rdev->desc_nr = info->number;
2682 if (info->raid_disk < mddev->raid_disks)
2683 rdev->raid_disk = info->raid_disk;
2684 else
2685 rdev->raid_disk = -1;
2686
b2d444d7
N		 2687 rdev->flags = 0;
2688
1da177e4 2689 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 2690 if (info->state & (1<<MD_DISK_SYNC))
2691 set_bit(In_sync, &rdev->flags);
1da177e4 2692
8ddf9efe
N		 2693 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
2694 set_bit(WriteMostly, &rdev->flags);
2695
1da177e4
LT		 2696 err = bind_rdev_to_array(rdev, mddev);
2697 if (err) {
2698 export_rdev(rdev);
2699 return err;
2700 }
2701
2702 if (!mddev->persistent) {
2703 printk(KERN_INFO "md: nonpersistent superblock ...\n");
2704 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2705 } else
2706 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
2707 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
2708
2709 if (!mddev->size || (mddev->size > rdev->size))
2710 mddev->size = rdev->size;
2711 }
2712
2713 return 0;
2714}
2715
2716static int hot_remove_disk(mddev_t * mddev, dev_t dev)
2717{
2718 char b[BDEVNAME_SIZE];
2719 mdk_rdev_t *rdev;
2720
2721 if (!mddev->pers)
2722 return -ENODEV;
2723
2724 rdev = find_rdev(mddev, dev);
2725 if (!rdev)
2726 return -ENXIO;
2727
2728 if (rdev->raid_disk >= 0)
2729 goto busy;
2730
2731 kick_rdev_from_array(rdev);
2732 md_update_sb(mddev);
d7603b7e 2733 md_new_event(mddev);
1da177e4
LT		 2734
2735 return 0;
2736busy:
2737 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
2738 bdevname(rdev->bdev,b), mdname(mddev));
2739 return -EBUSY;
2740}
2741
2742static int hot_add_disk(mddev_t * mddev, dev_t dev)
2743{
2744 char b[BDEVNAME_SIZE];
2745 int err;
2746 unsigned int size;
2747 mdk_rdev_t *rdev;
2748
2749 if (!mddev->pers)
2750 return -ENODEV;
2751
2752 if (mddev->major_version != 0) {
2753 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
2754 " version-0 superblocks.\n",
2755 mdname(mddev));
2756 return -EINVAL;
2757 }
2758 if (!mddev->pers->hot_add_disk) {
2759 printk(KERN_WARNING
2760 "%s: personality does not support diskops!\n",
2761 mdname(mddev));
2762 return -EINVAL;
2763 }
2764
2765 rdev = md_import_device (dev, -1, 0);
2766 if (IS_ERR(rdev)) {
2767 printk(KERN_WARNING
2768 "md: error, md_import_device() returned %ld\n",
2769 PTR_ERR(rdev));
2770 return -EINVAL;
2771 }
2772
2773 if (mddev->persistent)
2774 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
2775 else
2776 rdev->sb_offset =
2777 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2778
2779 size = calc_dev_size(rdev, mddev->chunk_size);
2780 rdev->size = size;
2781
2782 if (size < mddev->size) {
2783 printk(KERN_WARNING
2784 "%s: disk size %llu blocks < array size %llu\n",
2785 mdname(mddev), (unsigned long long)size,
2786 (unsigned long long)mddev->size);
2787 err = -ENOSPC;
2788 goto abort_export;
2789 }
2790
b2d444d7 2791 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 2792 printk(KERN_WARNING
2793 "md: can not hot-add faulty %s disk to %s!\n",
2794 bdevname(rdev->bdev,b), mdname(mddev));
2795 err = -EINVAL;
2796 goto abort_export;
2797 }
b2d444d7 2798 clear_bit(In_sync, &rdev->flags);
1da177e4
LT		 2799 rdev->desc_nr = -1;
2800 bind_rdev_to_array(rdev, mddev);
2801
2802 /*
2803 * The rest should better be atomic, we can have disk failures
2804 * noticed in interrupt contexts ...
2805 */
2806
2807 if (rdev->desc_nr == mddev->max_disks) {
2808 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
2809 mdname(mddev));
2810 err = -EBUSY;
2811 goto abort_unbind_export;
2812 }
2813
2814 rdev->raid_disk = -1;
2815
2816 md_update_sb(mddev);
2817
2818 /*
2819 * Kick recovery, maybe this spare has to be added to the
2820 * array immediately.
2821 */
2822 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2823 md_wakeup_thread(mddev->thread);
d7603b7e 2824 md_new_event(mddev);
1da177e4
LT		 2825 return 0;
2826
2827abort_unbind_export:
2828 unbind_rdev_from_array(rdev);
2829
2830abort_export:
2831 export_rdev(rdev);
2832 return err;
2833}
2834
32a7627c
N		 2835/* similar to deny_write_access, but accounts for our holding a reference
2836 * to the file ourselves */
2837static int deny_bitmap_write_access(struct file * file)
2838{
2839 struct inode *inode = file->f_mapping->host;
2840
2841 spin_lock(&inode->i_lock);
2842 if (atomic_read(&inode->i_writecount) > 1) {
2843 spin_unlock(&inode->i_lock);
2844 return -ETXTBSY;
2845 }
2846 atomic_set(&inode->i_writecount, -1);
2847 spin_unlock(&inode->i_lock);
2848
2849 return 0;
2850}
2851
2852static int set_bitmap_file(mddev_t *mddev, int fd)
2853{
2854 int err;
2855
36fa3063
N		 2856 if (mddev->pers) {
2857 if (!mddev->pers->quiesce)
2858 return -EBUSY;
2859 if (mddev->recovery || mddev->sync_thread)
2860 return -EBUSY;
2861 /* we should be able to change the bitmap.. */
2862 }
32a7627c 2863
32a7627c 2864
36fa3063
N		 2865 if (fd >= 0) {
2866 if (mddev->bitmap)
2867 return -EEXIST; /* cannot add when bitmap is present */
2868 mddev->bitmap_file = fget(fd);
32a7627c 2869
36fa3063
N		 2870 if (mddev->bitmap_file == NULL) {
2871 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
2872 mdname(mddev));
2873 return -EBADF;
2874 }
2875
2876 err = deny_bitmap_write_access(mddev->bitmap_file);
2877 if (err) {
2878 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
2879 mdname(mddev));
2880 fput(mddev->bitmap_file);
2881 mddev->bitmap_file = NULL;
2882 return err;
2883 }
a654b9d8 2884 mddev->bitmap_offset = 0; /* file overrides offset */
36fa3063
N		 2885 } else if (mddev->bitmap == NULL)
2886 return -ENOENT; /* cannot remove what isn't there */
2887 err = 0;
2888 if (mddev->pers) {
2889 mddev->pers->quiesce(mddev, 1);
2890 if (fd >= 0)
2891 err = bitmap_create(mddev);
2892 if (fd < 0 || err)
2893 bitmap_destroy(mddev);
2894 mddev->pers->quiesce(mddev, 0);
2895 } else if (fd < 0) {
2896 if (mddev->bitmap_file)
2897 fput(mddev->bitmap_file);
2898 mddev->bitmap_file = NULL;
2899 }
2900
32a7627c
N		 2901 return err;
2902}
2903
1da177e4
LT		 2904/*
2905 * set_array_info is used two different ways
2906 * The original usage is when creating a new array.
2907 * In this usage, raid_disks is > 0 and it together with
2908 * level, size, not_persistent,layout,chunksize determine the
2909 * shape of the array.
2910 * This will always create an array with a type-0.90.0 superblock.
2911 * The newer usage is when assembling an array.
2912 * In this case raid_disks will be 0, and the major_version field is
2913 * use to determine which style super-blocks are to be found on the devices.
2914 * The minor and patch _version numbers are also kept incase the
2915 * super_block handler wishes to interpret them.
2916 */
2917static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
2918{
2919
2920 if (info->raid_disks == 0) {
2921 /* just setting version number for superblock loading */
2922 if (info->major_version < 0 ||
2923 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
2924 super_types[info->major_version].name == NULL) {
2925 /* maybe try to auto-load a module? */
2926 printk(KERN_INFO
2927 "md: superblock version %d not known\n",
2928 info->major_version);
2929 return -EINVAL;
2930 }
2931 mddev->major_version = info->major_version;
2932 mddev->minor_version = info->minor_version;
2933 mddev->patch_version = info->patch_version;
2934 return 0;
2935 }
2936 mddev->major_version = MD_MAJOR_VERSION;
2937 mddev->minor_version = MD_MINOR_VERSION;
2938 mddev->patch_version = MD_PATCHLEVEL_VERSION;
2939 mddev->ctime = get_seconds();
2940
2941 mddev->level = info->level;
2942 mddev->size = info->size;
2943 mddev->raid_disks = info->raid_disks;
2944 /* don't set md_minor, it is determined by which /dev/md* was
2945 * openned
2946 */
2947 if (info->state & (1<<MD_SB_CLEAN))
2948 mddev->recovery_cp = MaxSector;
2949 else
2950 mddev->recovery_cp = 0;
2951 mddev->persistent = ! info->not_persistent;
2952
2953 mddev->layout = info->layout;
2954 mddev->chunk_size = info->chunk_size;
2955
2956 mddev->max_disks = MD_SB_DISKS;
2957
2958 mddev->sb_dirty = 1;
2959
b2a2703c
N		 2960 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
2961 mddev->bitmap_offset = 0;
2962
1da177e4
LT		 2963 /*
2964 * Generate a 128 bit UUID
2965 */
2966 get_random_bytes(mddev->uuid, 16);
2967
2968 return 0;
2969}
2970
2971/*
2972 * update_array_info is used to change the configuration of an
2973 * on-line array.
2974 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
2975 * fields in the info are checked against the array.
2976 * Any differences that cannot be handled will cause an error.
2977 * Normally, only one change can be managed at a time.
2978 */
2979static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
2980{
2981 int rv = 0;
2982 int cnt = 0;
36fa3063
N		 2983 int state = 0;
2984
2985 /* calculate expected state,ignoring low bits */
2986 if (mddev->bitmap && mddev->bitmap_offset)
2987 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 2988
2989 if (mddev->major_version != info->major_version ||
2990 mddev->minor_version != info->minor_version ||
2991/* mddev->patch_version != info->patch_version || */
2992 mddev->ctime != info->ctime ||
2993 mddev->level != info->level ||
2994/* mddev->layout != info->layout || */
2995 !mddev->persistent != info->not_persistent||
36fa3063
N		 2996 mddev->chunk_size != info->chunk_size ||
2997 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
2998 ((state^info->state) & 0xfffffe00)
2999 )
1da177e4
LT		 3000 return -EINVAL;
3001 /* Check there is only one change */
3002 if (mddev->size != info->size) cnt++;
3003 if (mddev->raid_disks != info->raid_disks) cnt++;
3004 if (mddev->layout != info->layout) cnt++;
36fa3063 3005 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
1da177e4
LT		 3006 if (cnt == 0) return 0;
3007 if (cnt > 1) return -EINVAL;
3008
3009 if (mddev->layout != info->layout) {
3010 /* Change layout
3011 * we don't need to do anything at the md level, the
3012 * personality will take care of it all.
3013 */
3014 if (mddev->pers->reconfig == NULL)
3015 return -EINVAL;
3016 else
3017 return mddev->pers->reconfig(mddev, info->layout, -1);
3018 }
3019 if (mddev->size != info->size) {
3020 mdk_rdev_t * rdev;
3021 struct list_head *tmp;
3022 if (mddev->pers->resize == NULL)
3023 return -EINVAL;
3024 /* The "size" is the amount of each device that is used.
3025 * This can only make sense for arrays with redundancy.
3026 * linear and raid0 always use whatever space is available
3027 * We can only consider changing the size if no resync
3028 * or reconstruction is happening, and if the new size
3029 * is acceptable. It must fit before the sb_offset or,
3030 * if that is <data_offset, it must fit before the
3031 * size of each device.
3032 * If size is zero, we find the largest size that fits.
3033 */
3034 if (mddev->sync_thread)
3035 return -EBUSY;
3036 ITERATE_RDEV(mddev,rdev,tmp) {
3037 sector_t avail;
3038 int fit = (info->size == 0);
3039 if (rdev->sb_offset > rdev->data_offset)
3040 avail = (rdev->sb_offset*2) - rdev->data_offset;
3041 else
3042 avail = get_capacity(rdev->bdev->bd_disk)
3043 - rdev->data_offset;
3044 if (fit && (info->size == 0 || info->size > avail/2))
3045 info->size = avail/2;
3046 if (avail < ((sector_t)info->size << 1))
3047 return -ENOSPC;
3048 }
3049 rv = mddev->pers->resize(mddev, (sector_t)info->size *2);
3050 if (!rv) {
3051 struct block_device *bdev;
3052
3053 bdev = bdget_disk(mddev->gendisk, 0);
3054 if (bdev) {
3055 down(&bdev->bd_inode->i_sem);
3056 i_size_write(bdev->bd_inode, mddev->array_size << 10);
3057 up(&bdev->bd_inode->i_sem);
3058 bdput(bdev);
3059 }
3060 }
3061 }
3062 if (mddev->raid_disks != info->raid_disks) {
3063 /* change the number of raid disks */
3064 if (mddev->pers->reshape == NULL)
3065 return -EINVAL;
3066 if (info->raid_disks <= 0 ||
3067 info->raid_disks >= mddev->max_disks)
3068 return -EINVAL;
3069 if (mddev->sync_thread)
3070 return -EBUSY;
3071 rv = mddev->pers->reshape(mddev, info->raid_disks);
3072 if (!rv) {
3073 struct block_device *bdev;
3074
3075 bdev = bdget_disk(mddev->gendisk, 0);
3076 if (bdev) {
3077 down(&bdev->bd_inode->i_sem);
3078 i_size_write(bdev->bd_inode, mddev->array_size << 10);
3079 up(&bdev->bd_inode->i_sem);
3080 bdput(bdev);
3081 }
3082 }
3083 }
36fa3063
N		 3084 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
3085 if (mddev->pers->quiesce == NULL)
3086 return -EINVAL;
3087 if (mddev->recovery || mddev->sync_thread)
3088 return -EBUSY;
3089 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
3090 /* add the bitmap */
3091 if (mddev->bitmap)
3092 return -EEXIST;
3093 if (mddev->default_bitmap_offset == 0)
3094 return -EINVAL;
3095 mddev->bitmap_offset = mddev->default_bitmap_offset;
3096 mddev->pers->quiesce(mddev, 1);
3097 rv = bitmap_create(mddev);
3098 if (rv)
3099 bitmap_destroy(mddev);
3100 mddev->pers->quiesce(mddev, 0);
3101 } else {
3102 /* remove the bitmap */
3103 if (!mddev->bitmap)
3104 return -ENOENT;
3105 if (mddev->bitmap->file)
3106 return -EINVAL;
3107 mddev->pers->quiesce(mddev, 1);
3108 bitmap_destroy(mddev);
3109 mddev->pers->quiesce(mddev, 0);
3110 mddev->bitmap_offset = 0;
3111 }
3112 }
1da177e4
LT		 3113 md_update_sb(mddev);
3114 return rv;
3115}
3116
3117static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3118{
3119 mdk_rdev_t *rdev;
3120
3121 if (mddev->pers == NULL)
3122 return -ENODEV;
3123
3124 rdev = find_rdev(mddev, dev);
3125 if (!rdev)
3126 return -ENODEV;
3127
3128 md_error(mddev, rdev);
3129 return 0;
3130}
3131
3132static int md_ioctl(struct inode *inode, struct file *file,
3133 unsigned int cmd, unsigned long arg)
3134{
3135 int err = 0;
3136 void __user *argp = (void __user *)arg;
3137 struct hd_geometry __user *loc = argp;
3138 mddev_t *mddev = NULL;
3139
3140 if (!capable(CAP_SYS_ADMIN))
3141 return -EACCES;
3142
3143 /*
3144 * Commands dealing with the RAID driver but not any
3145 * particular array:
3146 */
3147 switch (cmd)
3148 {
3149 case RAID_VERSION:
3150 err = get_version(argp);
3151 goto done;
3152
3153 case PRINT_RAID_DEBUG:
3154 err = 0;
3155 md_print_devices();
3156 goto done;
3157
3158#ifndef MODULE
3159 case RAID_AUTORUN:
3160 err = 0;
3161 autostart_arrays(arg);
3162 goto done;
3163#endif
3164 default:;
3165 }
3166
3167 /*
3168 * Commands creating/starting a new array:
3169 */
3170
3171 mddev = inode->i_bdev->bd_disk->private_data;
3172
3173 if (!mddev) {
3174 BUG();
3175 goto abort;
3176 }
3177
3178
3179 if (cmd == START_ARRAY) {
3180 /* START_ARRAY doesn't need to lock the array as autostart_array
3181 * does the locking, and it could even be a different array
3182 */
3183 static int cnt = 3;
3184 if (cnt > 0 ) {
3185 printk(KERN_WARNING
3186 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
e8a00334 3187 "This will not be supported beyond July 2006\n",
1da177e4
LT		 3188 current->comm, current->pid);
3189 cnt--;
3190 }
3191 err = autostart_array(new_decode_dev(arg));
3192 if (err) {
3193 printk(KERN_WARNING "md: autostart failed!\n");
3194 goto abort;
3195 }
3196 goto done;
3197 }
3198
3199 err = mddev_lock(mddev);
3200 if (err) {
3201 printk(KERN_INFO
3202 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3203 err, cmd);
3204 goto abort;
3205 }
3206
3207 switch (cmd)
3208 {
3209 case SET_ARRAY_INFO:
3210 {
3211 mdu_array_info_t info;
3212 if (!arg)
3213 memset(&info, 0, sizeof(info));
3214 else if (copy_from_user(&info, argp, sizeof(info))) {
3215 err = -EFAULT;
3216 goto abort_unlock;
3217 }
3218 if (mddev->pers) {
3219 err = update_array_info(mddev, &info);
3220 if (err) {
3221 printk(KERN_WARNING "md: couldn't update"
3222 " array info. %d\n", err);
3223 goto abort_unlock;
3224 }
3225 goto done_unlock;
3226 }
3227 if (!list_empty(&mddev->disks)) {
3228 printk(KERN_WARNING
3229 "md: array %s already has disks!\n",
3230 mdname(mddev));
3231 err = -EBUSY;
3232 goto abort_unlock;
3233 }
3234 if (mddev->raid_disks) {
3235 printk(KERN_WARNING
3236 "md: array %s already initialised!\n",
3237 mdname(mddev));
3238 err = -EBUSY;
3239 goto abort_unlock;
3240 }
3241 err = set_array_info(mddev, &info);
3242 if (err) {
3243 printk(KERN_WARNING "md: couldn't set"
3244 " array info. %d\n", err);
3245 goto abort_unlock;
3246 }
3247 }
3248 goto done_unlock;
3249
3250 default:;
3251 }
3252
3253 /*
3254 * Commands querying/configuring an existing array:
3255 */
32a7627c
N		 3256 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3257 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3258 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3259 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
1da177e4
LT		 3260 err = -ENODEV;
3261 goto abort_unlock;
3262 }
3263
3264 /*
3265 * Commands even a read-only array can execute:
3266 */
3267 switch (cmd)
3268 {
3269 case GET_ARRAY_INFO:
3270 err = get_array_info(mddev, argp);
3271 goto done_unlock;
3272
32a7627c 3273 case GET_BITMAP_FILE:
87162a28 3274 err = get_bitmap_file(mddev, argp);
32a7627c
N		 3275 goto done_unlock;
3276
1da177e4
LT		 3277 case GET_DISK_INFO:
3278 err = get_disk_info(mddev, argp);
3279 goto done_unlock;
3280
3281 case RESTART_ARRAY_RW:
3282 err = restart_array(mddev);
3283 goto done_unlock;
3284
3285 case STOP_ARRAY:
3286 err = do_md_stop (mddev, 0);
3287 goto done_unlock;
3288
3289 case STOP_ARRAY_RO:
3290 err = do_md_stop (mddev, 1);
3291 goto done_unlock;
3292
3293 /*
3294 * We have a problem here : there is no easy way to give a CHS
3295 * virtual geometry. We currently pretend that we have a 2 heads
3296 * 4 sectors (with a BIG number of cylinders...). This drives
3297 * dosfs just mad... ;-)
3298 */
3299 case HDIO_GETGEO:
3300 if (!loc) {
3301 err = -EINVAL;
3302 goto abort_unlock;
3303 }
3304 err = put_user (2, (char __user *) &loc->heads);
3305 if (err)
3306 goto abort_unlock;
3307 err = put_user (4, (char __user *) &loc->sectors);
3308 if (err)
3309 goto abort_unlock;
3310 err = put_user(get_capacity(mddev->gendisk)/8,
3311 (short __user *) &loc->cylinders);
3312 if (err)
3313 goto abort_unlock;
3314 err = put_user (get_start_sect(inode->i_bdev),
3315 (long __user *) &loc->start);
3316 goto done_unlock;
3317 }
3318
3319 /*
3320 * The remaining ioctls are changing the state of the
f91de92e
N		 3321 * superblock, so we do not allow them on read-only arrays.
3322 * However non-MD ioctls (e.g. get-size) will still come through
3323 * here and hit the 'default' below, so only disallow
3324 * 'md' ioctls, and switch to rw mode if started auto-readonly.
1da177e4 3325 */
f91de92e
N		 3326 if (_IOC_TYPE(cmd) == MD_MAJOR &&
3327 mddev->ro && mddev->pers) {
3328 if (mddev->ro == 2) {
3329 mddev->ro = 0;
3330 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3331 md_wakeup_thread(mddev->thread);
3332
3333 } else {
3334 err = -EROFS;
3335 goto abort_unlock;
3336 }
1da177e4
LT		 3337 }
3338
3339 switch (cmd)
3340 {
3341 case ADD_NEW_DISK:
3342 {
3343 mdu_disk_info_t info;
3344 if (copy_from_user(&info, argp, sizeof(info)))
3345 err = -EFAULT;
3346 else
3347 err = add_new_disk(mddev, &info);
3348 goto done_unlock;
3349 }
3350
3351 case HOT_REMOVE_DISK:
3352 err = hot_remove_disk(mddev, new_decode_dev(arg));
3353 goto done_unlock;
3354
3355 case HOT_ADD_DISK:
3356 err = hot_add_disk(mddev, new_decode_dev(arg));
3357 goto done_unlock;
3358
3359 case SET_DISK_FAULTY:
3360 err = set_disk_faulty(mddev, new_decode_dev(arg));
3361 goto done_unlock;
3362
3363 case RUN_ARRAY:
3364 err = do_md_run (mddev);
3365 goto done_unlock;
3366
32a7627c
N		 3367 case SET_BITMAP_FILE:
3368 err = set_bitmap_file(mddev, (int)arg);
3369 goto done_unlock;
3370
1da177e4
LT		 3371 default:
3372 if (_IOC_TYPE(cmd) == MD_MAJOR)
3373 printk(KERN_WARNING "md: %s(pid %d) used"
3374 " obsolete MD ioctl, upgrade your"
3375 " software to use new ictls.\n",
3376 current->comm, current->pid);
3377 err = -EINVAL;
3378 goto abort_unlock;
3379 }
3380
3381done_unlock:
3382abort_unlock:
3383 mddev_unlock(mddev);
3384
3385 return err;
3386done:
3387 if (err)
3388 MD_BUG();
3389abort:
3390 return err;
3391}
3392
3393static int md_open(struct inode *inode, struct file *file)
3394{
3395 /*
3396 * Succeed if we can lock the mddev, which confirms that
3397 * it isn't being stopped right now.
3398 */
3399 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3400 int err;
3401
3402 if ((err = mddev_lock(mddev)))
3403 goto out;
3404
3405 err = 0;
3406 mddev_get(mddev);
3407 mddev_unlock(mddev);
3408
3409 check_disk_change(inode->i_bdev);
3410 out:
3411 return err;
3412}
3413
3414static int md_release(struct inode *inode, struct file * file)
3415{
3416 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3417
3418 if (!mddev)
3419 BUG();
3420 mddev_put(mddev);
3421
3422 return 0;
3423}
3424
3425static int md_media_changed(struct gendisk *disk)
3426{
3427 mddev_t *mddev = disk->private_data;
3428
3429 return mddev->changed;
3430}
3431
3432static int md_revalidate(struct gendisk *disk)
3433{
3434 mddev_t *mddev = disk->private_data;
3435
3436 mddev->changed = 0;
3437 return 0;
3438}
3439static struct block_device_operations md_fops =
3440{
3441 .owner = THIS_MODULE,
3442 .open = md_open,
3443 .release = md_release,
3444 .ioctl = md_ioctl,
3445 .media_changed = md_media_changed,
3446 .revalidate_disk= md_revalidate,
3447};
3448
75c96f85 3449static int md_thread(void * arg)
1da177e4
LT		 3450{
3451 mdk_thread_t *thread = arg;
3452
1da177e4
LT		 3453 /*
3454 * md_thread is a 'system-thread', it's priority should be very
3455 * high. We avoid resource deadlocks individually in each
3456 * raid personality. (RAID5 does preallocation) We also use RR and
3457 * the very same RT priority as kswapd, thus we will never get
3458 * into a priority inversion deadlock.
3459 *
3460 * we definitely have to have equal or higher priority than
3461 * bdflush, otherwise bdflush will deadlock if there are too
3462 * many dirty RAID5 blocks.
3463 */
1da177e4 3464
6985c43f 3465 allow_signal(SIGKILL);
a6fb0934 3466 while (!kthread_should_stop()) {
1da177e4 3467
93588e22
N		 3468 /* We need to wait INTERRUPTIBLE so that
3469 * we don't add to the load-average.
3470 * That means we need to be sure no signals are
3471 * pending
3472 */
3473 if (signal_pending(current))
3474 flush_signals(current);
3475
3476 wait_event_interruptible_timeout
3477 (thread->wqueue,
3478 test_bit(THREAD_WAKEUP, &thread->flags)
3479 || kthread_should_stop(),
3480 thread->timeout);
3e1d1d28 3481 try_to_freeze();
1da177e4
LT		 3482
3483 clear_bit(THREAD_WAKEUP, &thread->flags);
3484
787453c2 3485 thread->run(thread->mddev);
1da177e4 3486 }
a6fb0934 3487
1da177e4
LT		 3488 return 0;
3489}
3490
3491void md_wakeup_thread(mdk_thread_t *thread)
3492{
3493 if (thread) {
3494 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
3495 set_bit(THREAD_WAKEUP, &thread->flags);
3496 wake_up(&thread->wqueue);
3497 }
3498}
3499
3500mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
3501 const char *name)
3502{
3503 mdk_thread_t *thread;
1da177e4 3504
9ffae0cf 3505 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
1da177e4
LT		 3506 if (!thread)
3507 return NULL;
3508
1da177e4
LT		 3509 init_waitqueue_head(&thread->wqueue);
3510
1da177e4
LT		 3511 thread->run = run;
3512 thread->mddev = mddev;
32a7627c 3513 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6985c43f 3514 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
a6fb0934 3515 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 3516 kfree(thread);
3517 return NULL;
3518 }
1da177e4
LT		 3519 return thread;
3520}
3521
1da177e4
LT		 3522void md_unregister_thread(mdk_thread_t *thread)
3523{
d28446fe 3524 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
a6fb0934
N		 3525
3526 kthread_stop(thread->tsk);
1da177e4
LT		 3527 kfree(thread);
3528}
3529
3530void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
3531{
3532 if (!mddev) {
3533 MD_BUG();
3534 return;
3535 }
3536
b2d444d7 3537 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 3538 return;
32a7627c 3539/*
1da177e4
LT		 3540 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
3541 mdname(mddev),
3542 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
3543 __builtin_return_address(0),__builtin_return_address(1),
3544 __builtin_return_address(2),__builtin_return_address(3));
32a7627c 3545*/
1da177e4
LT		 3546 if (!mddev->pers->error_handler)
3547 return;
3548 mddev->pers->error_handler(mddev,rdev);
3549 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3550 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3551 md_wakeup_thread(mddev->thread);
d7603b7e 3552 md_new_event(mddev);
1da177e4
LT		 3553}
3554
3555/* seq_file implementation /proc/mdstat */
3556
3557static void status_unused(struct seq_file *seq)
3558{
3559 int i = 0;
3560 mdk_rdev_t *rdev;
3561 struct list_head *tmp;
3562
3563 seq_printf(seq, "unused devices: ");
3564
3565 ITERATE_RDEV_PENDING(rdev,tmp) {
3566 char b[BDEVNAME_SIZE];
3567 i++;
3568 seq_printf(seq, "%s ",
3569 bdevname(rdev->bdev,b));
3570 }
3571 if (!i)
3572 seq_printf(seq, "<none>");
3573
3574 seq_printf(seq, "\n");
3575}
3576
3577
3578static void status_resync(struct seq_file *seq, mddev_t * mddev)
3579{
3580 unsigned long max_blocks, resync, res, dt, db, rt;
3581
3582 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
3583
3584 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3585 max_blocks = mddev->resync_max_sectors >> 1;
3586 else
3587 max_blocks = mddev->size;
3588
3589 /*
3590 * Should not happen.
3591 */
3592 if (!max_blocks) {
3593 MD_BUG();
3594 return;
3595 }
3596 res = (resync/1024)*1000/(max_blocks/1024 + 1);
3597 {
3598 int i, x = res/50, y = 20-x;
3599 seq_printf(seq, "[");
3600 for (i = 0; i < x; i++)
3601 seq_printf(seq, "=");
3602 seq_printf(seq, ">");
3603 for (i = 0; i < y; i++)
3604 seq_printf(seq, ".");
3605 seq_printf(seq, "] ");
3606 }
3607 seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)",
3608 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
3609 "resync" : "recovery"),
3610 res/10, res % 10, resync, max_blocks);
3611
3612 /*
3613 * We do not want to overflow, so the order of operands and
3614 * the * 100 / 100 trick are important. We do a +1 to be
3615 * safe against division by zero. We only estimate anyway.
3616 *
3617 * dt: time from mark until now
3618 * db: blocks written from mark until now
3619 * rt: remaining time
3620 */
3621 dt = ((jiffies - mddev->resync_mark) / HZ);
3622 if (!dt) dt++;
3623 db = resync - (mddev->resync_mark_cnt/2);
3624 rt = (dt * ((max_blocks-resync) / (db/100+1)))/100;
3625
3626 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
3627
3628 seq_printf(seq, " speed=%ldK/sec", db/dt);
3629}
3630
3631static void *md_seq_start(struct seq_file *seq, loff_t *pos)
3632{
3633 struct list_head *tmp;
3634 loff_t l = *pos;
3635 mddev_t *mddev;
3636
3637 if (l >= 0x10000)
3638 return NULL;
3639 if (!l--)
3640 /* header */
3641 return (void*)1;
3642
3643 spin_lock(&all_mddevs_lock);
3644 list_for_each(tmp,&all_mddevs)
3645 if (!l--) {
3646 mddev = list_entry(tmp, mddev_t, all_mddevs);
3647 mddev_get(mddev);
3648 spin_unlock(&all_mddevs_lock);
3649 return mddev;
3650 }
3651 spin_unlock(&all_mddevs_lock);
3652 if (!l--)
3653 return (void*)2;/* tail */
3654 return NULL;
3655}
3656
3657static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3658{
3659 struct list_head *tmp;
3660 mddev_t *next_mddev, *mddev = v;
3661
3662 ++*pos;
3663 if (v == (void*)2)
3664 return NULL;
3665
3666 spin_lock(&all_mddevs_lock);
3667 if (v == (void*)1)
3668 tmp = all_mddevs.next;
3669 else
3670 tmp = mddev->all_mddevs.next;
3671 if (tmp != &all_mddevs)
3672 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
3673 else {
3674 next_mddev = (void*)2;
3675 *pos = 0x10000;
3676 }
3677 spin_unlock(&all_mddevs_lock);
3678
3679 if (v != (void*)1)
3680 mddev_put(mddev);
3681 return next_mddev;
3682
3683}
3684
3685static void md_seq_stop(struct seq_file *seq, void *v)
3686{
3687 mddev_t *mddev = v;
3688
3689 if (mddev && v != (void*)1 && v != (void*)2)
3690 mddev_put(mddev);
3691}
3692
d7603b7e
N		 3693struct mdstat_info {
3694 int event;
3695};
3696
1da177e4
LT		 3697static int md_seq_show(struct seq_file *seq, void *v)
3698{
3699 mddev_t *mddev = v;
3700 sector_t size;
3701 struct list_head *tmp2;
3702 mdk_rdev_t *rdev;
d7603b7e 3703 struct mdstat_info *mi = seq->private;
1da177e4 3704 int i;
32a7627c 3705 struct bitmap *bitmap;
1da177e4
LT		 3706
3707 if (v == (void*)1) {
3708 seq_printf(seq, "Personalities : ");
3709 spin_lock(&pers_lock);
3710 for (i = 0; i < MAX_PERSONALITY; i++)
3711 if (pers[i])
3712 seq_printf(seq, "[%s] ", pers[i]->name);
3713
3714 spin_unlock(&pers_lock);
3715 seq_printf(seq, "\n");
d7603b7e 3716 mi->event = atomic_read(&md_event_count);
1da177e4
LT		 3717 return 0;
3718 }
3719 if (v == (void*)2) {
3720 status_unused(seq);
3721 return 0;
3722 }
3723
3724 if (mddev_lock(mddev)!=0)
3725 return -EINTR;
3726 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
3727 seq_printf(seq, "%s : %sactive", mdname(mddev),
3728 mddev->pers ? "" : "in");
3729 if (mddev->pers) {
f91de92e 3730 if (mddev->ro==1)
1da177e4 3731 seq_printf(seq, " (read-only)");
f91de92e
N		 3732 if (mddev->ro==2)
3733 seq_printf(seq, "(auto-read-only)");
1da177e4
LT		 3734 seq_printf(seq, " %s", mddev->pers->name);
3735 }
3736
3737 size = 0;
3738 ITERATE_RDEV(mddev,rdev,tmp2) {
3739 char b[BDEVNAME_SIZE];
3740 seq_printf(seq, " %s[%d]",
3741 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 3742 if (test_bit(WriteMostly, &rdev->flags))
3743 seq_printf(seq, "(W)");
b2d444d7 3744 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 3745 seq_printf(seq, "(F)");
3746 continue;
b325a32e
N		 3747 } else if (rdev->raid_disk < 0)
3748 seq_printf(seq, "(S)"); /* spare */
1da177e4
LT		 3749 size += rdev->size;
3750 }
3751
3752 if (!list_empty(&mddev->disks)) {
3753 if (mddev->pers)
3754 seq_printf(seq, "\n %llu blocks",
3755 (unsigned long long)mddev->array_size);
3756 else
3757 seq_printf(seq, "\n %llu blocks",
3758 (unsigned long long)size);
3759 }
1cd6bf19
N		 3760 if (mddev->persistent) {
3761 if (mddev->major_version != 0 ||
3762 mddev->minor_version != 90) {
3763 seq_printf(seq," super %d.%d",
3764 mddev->major_version,
3765 mddev->minor_version);
3766 }
3767 } else
3768 seq_printf(seq, " super non-persistent");
1da177e4
LT		 3769
3770 if (mddev->pers) {
3771 mddev->pers->status (seq, mddev);
3772 seq_printf(seq, "\n ");
8e1b39d6
N		 3773 if (mddev->pers->sync_request) {
3774 if (mddev->curr_resync > 2) {
3775 status_resync (seq, mddev);
3776 seq_printf(seq, "\n ");
3777 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
3778 seq_printf(seq, "\tresync=DELAYED\n ");
3779 else if (mddev->recovery_cp < MaxSector)
3780 seq_printf(seq, "\tresync=PENDING\n ");
3781 }
32a7627c
N		 3782 } else
3783 seq_printf(seq, "\n ");
3784
3785 if ((bitmap = mddev->bitmap)) {
32a7627c
N		 3786 unsigned long chunk_kb;
3787 unsigned long flags;
32a7627c
N		 3788 spin_lock_irqsave(&bitmap->lock, flags);
3789 chunk_kb = bitmap->chunksize >> 10;
3790 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
3791 "%lu%s chunk",
3792 bitmap->pages - bitmap->missing_pages,
3793 bitmap->pages,
3794 (bitmap->pages - bitmap->missing_pages)
3795 << (PAGE_SHIFT - 10),
3796 chunk_kb ? chunk_kb : bitmap->chunksize,
3797 chunk_kb ? "KB" : "B");
78d742d8
N		 3798 if (bitmap->file) {
3799 seq_printf(seq, ", file: ");
3800 seq_path(seq, bitmap->file->f_vfsmnt,
3801 bitmap->file->f_dentry," \t\n");
32a7627c 3802 }
78d742d8 3803
32a7627c
N		 3804 seq_printf(seq, "\n");
3805 spin_unlock_irqrestore(&bitmap->lock, flags);
1da177e4
LT		 3806 }
3807
3808 seq_printf(seq, "\n");
3809 }
3810 mddev_unlock(mddev);
3811
3812 return 0;
3813}
3814
3815static struct seq_operations md_seq_ops = {
3816 .start = md_seq_start,
3817 .next = md_seq_next,
3818 .stop = md_seq_stop,
3819 .show = md_seq_show,
3820};
3821
3822static int md_seq_open(struct inode *inode, struct file *file)
3823{
3824 int error;
d7603b7e
N		 3825 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
3826 if (mi == NULL)
3827 return -ENOMEM;
1da177e4
LT		 3828
3829 error = seq_open(file, &md_seq_ops);
d7603b7e
N		 3830 if (error)
3831 kfree(mi);
3832 else {
3833 struct seq_file *p = file->private_data;
3834 p->private = mi;
3835 mi->event = atomic_read(&md_event_count);
3836 }
1da177e4
LT		 3837 return error;
3838}
3839
d7603b7e
N		 3840static int md_seq_release(struct inode *inode, struct file *file)
3841{
3842 struct seq_file *m = file->private_data;
3843 struct mdstat_info *mi = m->private;
3844 m->private = NULL;
3845 kfree(mi);
3846 return seq_release(inode, file);
3847}
3848
3849static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
3850{
3851 struct seq_file *m = filp->private_data;
3852 struct mdstat_info *mi = m->private;
3853 int mask;
3854
3855 poll_wait(filp, &md_event_waiters, wait);
3856
3857 /* always allow read */
3858 mask = POLLIN | POLLRDNORM;
3859
3860 if (mi->event != atomic_read(&md_event_count))
3861 mask |= POLLERR | POLLPRI;
3862 return mask;
3863}
3864
1da177e4
LT		 3865static struct file_operations md_seq_fops = {
3866 .open = md_seq_open,
3867 .read = seq_read,
3868 .llseek = seq_lseek,
d7603b7e
N		 3869 .release = md_seq_release,
3870 .poll = mdstat_poll,
1da177e4
LT		 3871};
3872
3873int register_md_personality(int pnum, mdk_personality_t *p)
3874{
3875 if (pnum >= MAX_PERSONALITY) {
3876 printk(KERN_ERR
3877 "md: tried to install personality %s as nr %d, but max is %lu\n",
3878 p->name, pnum, MAX_PERSONALITY-1);
3879 return -EINVAL;
3880 }
3881
3882 spin_lock(&pers_lock);
3883 if (pers[pnum]) {
3884 spin_unlock(&pers_lock);
1da177e4
LT		 3885 return -EBUSY;
3886 }
3887
3888 pers[pnum] = p;
3889 printk(KERN_INFO "md: %s personality registered as nr %d\n", p->name, pnum);
3890 spin_unlock(&pers_lock);
3891 return 0;
3892}
3893
3894int unregister_md_personality(int pnum)
3895{
a757e64c 3896 if (pnum >= MAX_PERSONALITY)
1da177e4 3897 return -EINVAL;
1da177e4
LT		 3898
3899 printk(KERN_INFO "md: %s personality unregistered\n", pers[pnum]->name);
3900 spin_lock(&pers_lock);
3901 pers[pnum] = NULL;
3902 spin_unlock(&pers_lock);
3903 return 0;
3904}
3905
3906static int is_mddev_idle(mddev_t *mddev)
3907{
3908 mdk_rdev_t * rdev;
3909 struct list_head *tmp;
3910 int idle;
3911 unsigned long curr_events;
3912
3913 idle = 1;
3914 ITERATE_RDEV(mddev,rdev,tmp) {
3915 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
a362357b
JA		 3916 curr_events = disk_stat_read(disk, sectors[0]) +
3917 disk_stat_read(disk, sectors[1]) -
1da177e4 3918 atomic_read(&disk->sync_io);
c0e48521
N		 3919 /* The difference between curr_events and last_events
3920 * will be affected by any new non-sync IO (making
3921 * curr_events bigger) and any difference in the amount of
3922 * in-flight syncio (making current_events bigger or smaller)
3923 * The amount in-flight is currently limited to
3924 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
3925 * which is at most 4096 sectors.
3926 * These numbers are fairly fragile and should be made
3927 * more robust, probably by enforcing the
3928 * 'window size' that md_do_sync sort-of uses.
3929 *
1da177e4
LT		 3930 * Note: the following is an unsigned comparison.
3931 */
c0e48521 3932 if ((curr_events - rdev->last_events + 4096) > 8192) {
1da177e4
LT		 3933 rdev->last_events = curr_events;
3934 idle = 0;
3935 }
3936 }
3937 return idle;
3938}
3939
3940void md_done_sync(mddev_t *mddev, int blocks, int ok)
3941{
3942 /* another "blocks" (512byte) blocks have been synced */
3943 atomic_sub(blocks, &mddev->recovery_active);
3944 wake_up(&mddev->recovery_wait);
3945 if (!ok) {
3946 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
3947 md_wakeup_thread(mddev->thread);
3948 // stop recovery, signal do_sync ....
3949 }
3950}
3951
3952
06d91a5f
N		 3953/* md_write_start(mddev, bi)
3954 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 3955 * in superblock) before writing, schedule a superblock update
3956 * and wait for it to complete.
06d91a5f 3957 */
3d310eb7 3958void md_write_start(mddev_t *mddev, struct bio *bi)
1da177e4 3959{
06d91a5f 3960 if (bio_data_dir(bi) != WRITE)
3d310eb7 3961 return;
06d91a5f 3962
f91de92e
N		 3963 BUG_ON(mddev->ro == 1);
3964 if (mddev->ro == 2) {
3965 /* need to switch to read/write */
3966 mddev->ro = 0;
3967 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3968 md_wakeup_thread(mddev->thread);
3969 }
06d91a5f 3970 atomic_inc(&mddev->writes_pending);
06d91a5f 3971 if (mddev->in_sync) {
a9701a30 3972 spin_lock_irq(&mddev->write_lock);
3d310eb7
N		 3973 if (mddev->in_sync) {
3974 mddev->in_sync = 0;
3975 mddev->sb_dirty = 1;
3976 md_wakeup_thread(mddev->thread);
3977 }
a9701a30 3978 spin_unlock_irq(&mddev->write_lock);
06d91a5f 3979 }
3d310eb7 3980 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
1da177e4
LT		 3981}
3982
3983void md_write_end(mddev_t *mddev)
3984{
3985 if (atomic_dec_and_test(&mddev->writes_pending)) {
3986 if (mddev->safemode == 2)
3987 md_wakeup_thread(mddev->thread);
3988 else
3989 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
3990 }
3991}
3992
75c96f85 3993static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
1da177e4
LT		 3994
3995#define SYNC_MARKS 10
3996#define SYNC_MARK_STEP (3*HZ)
3997static void md_do_sync(mddev_t *mddev)
3998{
3999 mddev_t *mddev2;
4000 unsigned int currspeed = 0,
4001 window;
57afd89f 4002 sector_t max_sectors,j, io_sectors;
1da177e4
LT		 4003 unsigned long mark[SYNC_MARKS];
4004 sector_t mark_cnt[SYNC_MARKS];
4005 int last_mark,m;
4006 struct list_head *tmp;
4007 sector_t last_check;
57afd89f 4008 int skipped = 0;
1da177e4
LT		 4009
4010 /* just incase thread restarts... */
4011 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
4012 return;
4013
4014 /* we overload curr_resync somewhat here.
4015 * 0 == not engaged in resync at all
4016 * 2 == checking that there is no conflict with another sync
4017 * 1 == like 2, but have yielded to allow conflicting resync to
4018 * commense
4019 * other == active in resync - this many blocks
4020 *
4021 * Before starting a resync we must have set curr_resync to
4022 * 2, and then checked that every "conflicting" array has curr_resync
4023 * less than ours. When we find one that is the same or higher
4024 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
4025 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
4026 * This will mean we have to start checking from the beginning again.
4027 *
4028 */
4029
4030 do {
4031 mddev->curr_resync = 2;
4032
4033 try_again:
787453c2 4034 if (kthread_should_stop()) {
6985c43f 4035 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1da177e4
LT		 4036 goto skip;
4037 }
4038 ITERATE_MDDEV(mddev2,tmp) {
1da177e4
LT		 4039 if (mddev2 == mddev)
4040 continue;
4041 if (mddev2->curr_resync &&
4042 match_mddev_units(mddev,mddev2)) {
4043 DEFINE_WAIT(wq);
4044 if (mddev < mddev2 && mddev->curr_resync == 2) {
4045 /* arbitrarily yield */
4046 mddev->curr_resync = 1;
4047 wake_up(&resync_wait);
4048 }
4049 if (mddev > mddev2 && mddev->curr_resync == 1)
4050 /* no need to wait here, we can wait the next
4051 * time 'round when curr_resync == 2
4052 */
4053 continue;
787453c2
N		 4054 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
4055 if (!kthread_should_stop() &&
8712e553 4056 mddev2->curr_resync >= mddev->curr_resync) {
1da177e4
LT		 4057 printk(KERN_INFO "md: delaying resync of %s"
4058 " until %s has finished resync (they"
4059 " share one or more physical units)\n",
4060 mdname(mddev), mdname(mddev2));
4061 mddev_put(mddev2);
4062 schedule();
4063 finish_wait(&resync_wait, &wq);
4064 goto try_again;
4065 }
4066 finish_wait(&resync_wait, &wq);
4067 }
4068 }
4069 } while (mddev->curr_resync < 2);
4070
9d88883e 4071 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 4072 /* resync follows the size requested by the personality,
57afd89f 4073 * which defaults to physical size, but can be virtual size
1da177e4
LT		 4074 */
4075 max_sectors = mddev->resync_max_sectors;
9d88883e
N		 4076 mddev->resync_mismatches = 0;
4077 } else
1da177e4
LT		 4078 /* recovery follows the physical size of devices */
4079 max_sectors = mddev->size << 1;
4080
4081 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
4082 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
4083 " %d KB/sec/disc.\n", sysctl_speed_limit_min);
338cec32 4084 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
1da177e4
LT		 4085 "(but not more than %d KB/sec) for reconstruction.\n",
4086 sysctl_speed_limit_max);
4087
4088 is_mddev_idle(mddev); /* this also initializes IO event counters */
32a7627c 4089 /* we don't use the checkpoint if there's a bitmap */
24dd469d
N		 4090 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap
4091 && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
1da177e4
LT		 4092 j = mddev->recovery_cp;
4093 else
4094 j = 0;
57afd89f 4095 io_sectors = 0;
1da177e4
LT		 4096 for (m = 0; m < SYNC_MARKS; m++) {
4097 mark[m] = jiffies;
57afd89f 4098 mark_cnt[m] = io_sectors;
1da177e4
LT		 4099 }
4100 last_mark = 0;
4101 mddev->resync_mark = mark[last_mark];
4102 mddev->resync_mark_cnt = mark_cnt[last_mark];
4103
4104 /*
4105 * Tune reconstruction:
4106 */
4107 window = 32*(PAGE_SIZE/512);
4108 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
4109 window/2,(unsigned long long) max_sectors/2);
4110
4111 atomic_set(&mddev->recovery_active, 0);
4112 init_waitqueue_head(&mddev->recovery_wait);
4113 last_check = 0;
4114
4115 if (j>2) {
4116 printk(KERN_INFO
4117 "md: resuming recovery of %s from checkpoint.\n",
4118 mdname(mddev));
4119 mddev->curr_resync = j;
4120 }
4121
4122 while (j < max_sectors) {
57afd89f 4123 sector_t sectors;
1da177e4 4124
57afd89f
N		 4125 skipped = 0;
4126 sectors = mddev->pers->sync_request(mddev, j, &skipped,
4127 currspeed < sysctl_speed_limit_min);
4128 if (sectors == 0) {
1da177e4
LT		 4129 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4130 goto out;
4131 }
57afd89f
N		 4132
4133 if (!skipped) { /* actual IO requested */
4134 io_sectors += sectors;
4135 atomic_add(sectors, &mddev->recovery_active);
4136 }
4137
1da177e4
LT		 4138 j += sectors;
4139 if (j>1) mddev->curr_resync = j;
d7603b7e
N		 4140 if (last_check == 0)
4141 /* this is the earliers that rebuilt will be
4142 * visible in /proc/mdstat
4143 */
4144 md_new_event(mddev);
57afd89f
N		 4145
4146 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 4147 continue;
4148
57afd89f 4149 last_check = io_sectors;
1da177e4
LT		 4150
4151 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
4152 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
4153 break;
4154
4155 repeat:
4156 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
4157 /* step marks */
4158 int next = (last_mark+1) % SYNC_MARKS;
4159
4160 mddev->resync_mark = mark[next];
4161 mddev->resync_mark_cnt = mark_cnt[next];
4162 mark[next] = jiffies;
57afd89f 4163 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 4164 last_mark = next;
4165 }
4166
4167
787453c2 4168 if (kthread_should_stop()) {
1da177e4
LT		 4169 /*
4170 * got a signal, exit.
4171 */
4172 printk(KERN_INFO
4173 "md: md_do_sync() got signal ... exiting\n");
1da177e4
LT		 4174 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4175 goto out;
4176 }
4177
4178 /*
4179 * this loop exits only if either when we are slower than
4180 * the 'hard' speed limit, or the system was IO-idle for
4181 * a jiffy.
4182 * the system might be non-idle CPU-wise, but we only care
4183 * about not overloading the IO subsystem. (things like an
4184 * e2fsck being done on the RAID array should execute fast)
4185 */
4186 mddev->queue->unplug_fn(mddev->queue);
4187 cond_resched();
4188
57afd89f
N		 4189 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
4190 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4
LT		 4191
4192 if (currspeed > sysctl_speed_limit_min) {
4193 if ((currspeed > sysctl_speed_limit_max) ||
4194 !is_mddev_idle(mddev)) {
c0e48521 4195 msleep(500);
1da177e4
LT		 4196 goto repeat;
4197 }
4198 }
4199 }
4200 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
4201 /*
4202 * this also signals 'finished resyncing' to md_stop
4203 */
4204 out:
4205 mddev->queue->unplug_fn(mddev->queue);
4206
4207 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
4208
4209 /* tell personality that we are finished */
57afd89f 4210 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
1da177e4
LT		 4211
4212 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4213 mddev->curr_resync > 2 &&
4214 mddev->curr_resync >= mddev->recovery_cp) {
4215 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4216 printk(KERN_INFO
4217 "md: checkpointing recovery of %s.\n",
4218 mdname(mddev));
4219 mddev->recovery_cp = mddev->curr_resync;
4220 } else
4221 mddev->recovery_cp = MaxSector;
4222 }
4223
1da177e4
LT		 4224 skip:
4225 mddev->curr_resync = 0;
4226 wake_up(&resync_wait);
4227 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
4228 md_wakeup_thread(mddev->thread);
4229}
4230
4231
4232/*
4233 * This routine is regularly called by all per-raid-array threads to
4234 * deal with generic issues like resync and super-block update.
4235 * Raid personalities that don't have a thread (linear/raid0) do not
4236 * need this as they never do any recovery or update the superblock.
4237 *
4238 * It does not do any resync itself, but rather "forks" off other threads
4239 * to do that as needed.
4240 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4241 * "->recovery" and create a thread at ->sync_thread.
4242 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4243 * and wakeups up this thread which will reap the thread and finish up.
4244 * This thread also removes any faulty devices (with nr_pending == 0).
4245 *
4246 * The overall approach is:
4247 * 1/ if the superblock needs updating, update it.
4248 * 2/ If a recovery thread is running, don't do anything else.
4249 * 3/ If recovery has finished, clean up, possibly marking spares active.
4250 * 4/ If there are any faulty devices, remove them.
4251 * 5/ If array is degraded, try to add spares devices
4252 * 6/ If array has spares or is not in-sync, start a resync thread.
4253 */
4254void md_check_recovery(mddev_t *mddev)
4255{
4256 mdk_rdev_t *rdev;
4257 struct list_head *rtmp;
4258
4259
5f40402d
N		 4260 if (mddev->bitmap)
4261 bitmap_daemon_work(mddev->bitmap);
1da177e4
LT		 4262
4263 if (mddev->ro)
4264 return;
fca4d848
N		 4265
4266 if (signal_pending(current)) {
4267 if (mddev->pers->sync_request) {
4268 printk(KERN_INFO "md: %s in immediate safe mode\n",
4269 mdname(mddev));
4270 mddev->safemode = 2;
4271 }
4272 flush_signals(current);
4273 }
4274
1da177e4
LT		 4275 if ( ! (
4276 mddev->sb_dirty ||
4277 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848
N		 4278 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
4279 (mddev->safemode == 1) ||
4280 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
4281 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 4282 ))
4283 return;
fca4d848 4284
1da177e4
LT		 4285 if (mddev_trylock(mddev)==0) {
4286 int spares =0;
fca4d848 4287
a9701a30 4288 spin_lock_irq(&mddev->write_lock);
fca4d848
N		 4289 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
4290 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
4291 mddev->in_sync = 1;
4292 mddev->sb_dirty = 1;
4293 }
4294 if (mddev->safemode == 1)
4295 mddev->safemode = 0;
a9701a30 4296 spin_unlock_irq(&mddev->write_lock);
fca4d848 4297
1da177e4
LT		 4298 if (mddev->sb_dirty)
4299 md_update_sb(mddev);
06d91a5f 4300
06d91a5f 4301
1da177e4
LT		 4302 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4303 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
4304 /* resync/recovery still happening */
4305 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4306 goto unlock;
4307 }
4308 if (mddev->sync_thread) {
4309 /* resync has finished, collect result */
4310 md_unregister_thread(mddev->sync_thread);
4311 mddev->sync_thread = NULL;
4312 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4313 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4314 /* success...*/
4315 /* activate any spares */
4316 mddev->pers->spare_active(mddev);
4317 }
4318 md_update_sb(mddev);
41158c7e
N		 4319
4320 /* if array is no-longer degraded, then any saved_raid_disk
4321 * information must be scrapped
4322 */
4323 if (!mddev->degraded)
4324 ITERATE_RDEV(mddev,rdev,rtmp)
4325 rdev->saved_raid_disk = -1;
4326
1da177e4
LT		 4327 mddev->recovery = 0;
4328 /* flag recovery needed just to double check */
4329 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
d7603b7e 4330 md_new_event(mddev);
1da177e4
LT		 4331 goto unlock;
4332 }
24dd469d
N		 4333 /* Clear some bits that don't mean anything, but
4334 * might be left set
4335 */
4336 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4337 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
4338 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
4339 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4
LT		 4340
4341 /* no recovery is running.
4342 * remove any failed drives, then
4343 * add spares if possible.
4344 * Spare are also removed and re-added, to allow
4345 * the personality to fail the re-add.
4346 */
4347 ITERATE_RDEV(mddev,rdev,rtmp)
4348 if (rdev->raid_disk >= 0 &&
b2d444d7 4349 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
1da177e4 4350 atomic_read(&rdev->nr_pending)==0) {
86e6ffdd
N		 4351 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
4352 char nm[20];
4353 sprintf(nm,"rd%d", rdev->raid_disk);
4354 sysfs_remove_link(&mddev->kobj, nm);
1da177e4 4355 rdev->raid_disk = -1;
86e6ffdd 4356 }
1da177e4
LT		 4357 }
4358
4359 if (mddev->degraded) {
4360 ITERATE_RDEV(mddev,rdev,rtmp)
4361 if (rdev->raid_disk < 0
b2d444d7 4362 && !test_bit(Faulty, &rdev->flags)) {
86e6ffdd
N		 4363 if (mddev->pers->hot_add_disk(mddev,rdev)) {
4364 char nm[20];
4365 sprintf(nm, "rd%d", rdev->raid_disk);
4366 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
1da177e4 4367 spares++;
d7603b7e 4368 md_new_event(mddev);
86e6ffdd 4369 } else
1da177e4
LT		 4370 break;
4371 }
4372 }
4373
24dd469d
N		 4374 if (spares) {
4375 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4376 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4377 } else if (mddev->recovery_cp < MaxSector) {
4378 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4379 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4380 /* nothing to be done ... */
1da177e4 4381 goto unlock;
24dd469d 4382
1da177e4
LT		 4383 if (mddev->pers->sync_request) {
4384 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
a654b9d8
N		 4385 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
4386 /* We are adding a device or devices to an array
4387 * which has the bitmap stored on all devices.
4388 * So make sure all bitmap pages get written
4389 */
4390 bitmap_write_all(mddev->bitmap);
4391 }
1da177e4
LT		 4392 mddev->sync_thread = md_register_thread(md_do_sync,
4393 mddev,
4394 "%s_resync");
4395 if (!mddev->sync_thread) {
4396 printk(KERN_ERR "%s: could not start resync"
4397 " thread...\n",
4398 mdname(mddev));
4399 /* leave the spares where they are, it shouldn't hurt */
4400 mddev->recovery = 0;
d7603b7e 4401 } else
1da177e4 4402 md_wakeup_thread(mddev->sync_thread);
d7603b7e 4403 md_new_event(mddev);
1da177e4
LT		 4404 }
4405 unlock:
4406 mddev_unlock(mddev);
4407 }
4408}
4409
75c96f85
AB		 4410static int md_notify_reboot(struct notifier_block *this,
4411 unsigned long code, void *x)
1da177e4
LT		 4412{
4413 struct list_head *tmp;
4414 mddev_t *mddev;
4415
4416 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
4417
4418 printk(KERN_INFO "md: stopping all md devices.\n");
4419
4420 ITERATE_MDDEV(mddev,tmp)
4421 if (mddev_trylock(mddev)==0)
4422 do_md_stop (mddev, 1);
4423 /*
4424 * certain more exotic SCSI devices are known to be
4425 * volatile wrt too early system reboots. While the
4426 * right place to handle this issue is the given
4427 * driver, we do want to have a safe RAID driver ...
4428 */
4429 mdelay(1000*1);
4430 }
4431 return NOTIFY_DONE;
4432}
4433
75c96f85 4434static struct notifier_block md_notifier = {
1da177e4
LT		 4435 .notifier_call = md_notify_reboot,
4436 .next = NULL,
4437 .priority = INT_MAX, /* before any real devices */
4438};
4439
4440static void md_geninit(void)
4441{
4442 struct proc_dir_entry *p;
4443
4444 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
4445
4446 p = create_proc_entry("mdstat", S_IRUGO, NULL);
4447 if (p)
4448 p->proc_fops = &md_seq_fops;
4449}
4450
75c96f85 4451static int __init md_init(void)
1da177e4
LT		 4452{
4453 int minor;
4454
4455 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4456 " MD_SB_DISKS=%d\n",
4457 MD_MAJOR_VERSION, MD_MINOR_VERSION,
4458 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
bd926c63 4459 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
32a7627c 4460 BITMAP_MINOR);
1da177e4
LT		 4461
4462 if (register_blkdev(MAJOR_NR, "md"))
4463 return -1;
4464 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
4465 unregister_blkdev(MAJOR_NR, "md");
4466 return -1;
4467 }
4468 devfs_mk_dir("md");
4469 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
4470 md_probe, NULL, NULL);
4471 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
4472 md_probe, NULL, NULL);
4473
4474 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4475 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
4476 S_IFBLK|S_IRUSR|S_IWUSR,
4477 "md/%d", minor);
4478
4479 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4480 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
4481 S_IFBLK|S_IRUSR|S_IWUSR,
4482 "md/mdp%d", minor);
4483
4484
4485 register_reboot_notifier(&md_notifier);
4486 raid_table_header = register_sysctl_table(raid_root_table, 1);
4487
4488 md_geninit();
4489 return (0);
4490}
4491
4492
4493#ifndef MODULE
4494
4495/*
4496 * Searches all registered partitions for autorun RAID arrays
4497 * at boot time.
4498 */
4499static dev_t detected_devices[128];
4500static int dev_cnt;
4501
4502void md_autodetect_dev(dev_t dev)
4503{
4504 if (dev_cnt >= 0 && dev_cnt < 127)
4505 detected_devices[dev_cnt++] = dev;
4506}
4507
4508
4509static void autostart_arrays(int part)
4510{
4511 mdk_rdev_t *rdev;
4512 int i;
4513
4514 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
4515
4516 for (i = 0; i < dev_cnt; i++) {
4517 dev_t dev = detected_devices[i];
4518
4519 rdev = md_import_device(dev,0, 0);
4520 if (IS_ERR(rdev))
4521 continue;
4522
b2d444d7 4523 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 4524 MD_BUG();
4525 continue;
4526 }
4527 list_add(&rdev->same_set, &pending_raid_disks);
4528 }
4529 dev_cnt = 0;
4530
4531 autorun_devices(part);
4532}
4533
4534#endif
4535
4536static __exit void md_exit(void)
4537{
4538 mddev_t *mddev;
4539 struct list_head *tmp;
4540 int i;
4541 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
4542 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
4543 for (i=0; i < MAX_MD_DEVS; i++)
4544 devfs_remove("md/%d", i);
4545 for (i=0; i < MAX_MD_DEVS; i++)
4546 devfs_remove("md/d%d", i);
4547
4548 devfs_remove("md");
4549
4550 unregister_blkdev(MAJOR_NR,"md");
4551 unregister_blkdev(mdp_major, "mdp");
4552 unregister_reboot_notifier(&md_notifier);
4553 unregister_sysctl_table(raid_table_header);
4554 remove_proc_entry("mdstat", NULL);
4555 ITERATE_MDDEV(mddev,tmp) {
4556 struct gendisk *disk = mddev->gendisk;
4557 if (!disk)
4558 continue;
4559 export_array(mddev);
4560 del_gendisk(disk);
4561 put_disk(disk);
4562 mddev->gendisk = NULL;
4563 mddev_put(mddev);
4564 }
4565}
4566
4567module_init(md_init)
4568module_exit(md_exit)
4569
f91de92e
N		 4570static int get_ro(char *buffer, struct kernel_param *kp)
4571{
4572 return sprintf(buffer, "%d", start_readonly);
4573}
4574static int set_ro(const char *val, struct kernel_param *kp)
4575{
4576 char *e;
4577 int num = simple_strtoul(val, &e, 10);
4578 if (*val && (*e == '\0' || *e == '\n')) {
4579 start_readonly = num;
4580 return 0;;
4581 }
4582 return -EINVAL;
4583}
4584
4585module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
6ff8d8ec
N		 4586module_param(start_dirty_degraded, int, 0644);
4587
f91de92e 4588
1da177e4
LT		 4589EXPORT_SYMBOL(register_md_personality);
4590EXPORT_SYMBOL(unregister_md_personality);
4591EXPORT_SYMBOL(md_error);
4592EXPORT_SYMBOL(md_done_sync);
4593EXPORT_SYMBOL(md_write_start);
4594EXPORT_SYMBOL(md_write_end);
1da177e4
LT		 4595EXPORT_SYMBOL(md_register_thread);
4596EXPORT_SYMBOL(md_unregister_thread);
4597EXPORT_SYMBOL(md_wakeup_thread);
4598EXPORT_SYMBOL(md_print_devices);
4599EXPORT_SYMBOL(md_check_recovery);
4600MODULE_LICENSE("GPL");
aa1595e9 4601MODULE_ALIAS("md");
72008652 4602MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
kernel source for telekom puls (alcatel/mediatek)