blob: adf960d8a7c98d1430c2e51b7e0250674b98abff [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
NeilBrown32a76272005-06-21 17:17:14 -070022 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
24
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 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>
NeilBrowna6fb0932005-09-09 16:23:56 -070037#include <linux/kthread.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <linux/linkage.h>
39#include <linux/raid/md.h>
NeilBrown32a76272005-06-21 17:17:14 -070040#include <linux/raid/bitmap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <linux/sysctl.h>
42#include <linux/devfs_fs_kernel.h>
43#include <linux/buffer_head.h> /* for invalidate_bdev */
44#include <linux/suspend.h>
45
46#include <linux/init.h>
47
NeilBrown32a76272005-06-21 17:17:14 -070048#include <linux/file.h>
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#ifdef CONFIG_KMOD
51#include <linux/kmod.h>
52#endif
53
54#include <asm/unaligned.h>
55
56#define MAJOR_NR MD_MAJOR
57#define MD_DRIVER
58
59/* 63 partitions with the alternate major number (mdp) */
60#define MdpMinorShift 6
61
62#define DEBUG 0
63#define dprintk(x...) ((void)(DEBUG && printk(x)))
64
65
66#ifndef MODULE
67static void autostart_arrays (int part);
68#endif
69
70static mdk_personality_t *pers[MAX_PERSONALITY];
71static DEFINE_SPINLOCK(pers_lock);
72
73/*
74 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
75 * is 1000 KB/sec, so the extra system load does not show up that much.
76 * Increase it if you want to have more _guaranteed_ speed. Note that
Adrian Bunk338cec32005-09-10 00:26:54 -070077 * the RAID driver will use the maximum available bandwidth if the IO
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 * subsystem is idle. There is also an 'absolute maximum' reconstruction
79 * speed limit - in case reconstruction slows down your system despite
80 * idle IO detection.
81 *
82 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
83 */
84
85static int sysctl_speed_limit_min = 1000;
86static int sysctl_speed_limit_max = 200000;
87
88static struct ctl_table_header *raid_table_header;
89
90static ctl_table raid_table[] = {
91 {
92 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
93 .procname = "speed_limit_min",
94 .data = &sysctl_speed_limit_min,
95 .maxlen = sizeof(int),
96 .mode = 0644,
97 .proc_handler = &proc_dointvec,
98 },
99 {
100 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
101 .procname = "speed_limit_max",
102 .data = &sysctl_speed_limit_max,
103 .maxlen = sizeof(int),
104 .mode = 0644,
105 .proc_handler = &proc_dointvec,
106 },
107 { .ctl_name = 0 }
108};
109
110static ctl_table raid_dir_table[] = {
111 {
112 .ctl_name = DEV_RAID,
113 .procname = "raid",
114 .maxlen = 0,
115 .mode = 0555,
116 .child = raid_table,
117 },
118 { .ctl_name = 0 }
119};
120
121static ctl_table raid_root_table[] = {
122 {
123 .ctl_name = CTL_DEV,
124 .procname = "dev",
125 .maxlen = 0,
126 .mode = 0555,
127 .child = raid_dir_table,
128 },
129 { .ctl_name = 0 }
130};
131
132static struct block_device_operations md_fops;
133
NeilBrownf91de922005-11-08 21:39:36 -0800134static int start_readonly;
135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136/*
137 * Enables to iterate over all existing md arrays
138 * all_mddevs_lock protects this list.
139 */
140static LIST_HEAD(all_mddevs);
141static DEFINE_SPINLOCK(all_mddevs_lock);
142
143
144/*
145 * iterates through all used mddevs in the system.
146 * We take care to grab the all_mddevs_lock whenever navigating
147 * the list, and to always hold a refcount when unlocked.
148 * Any code which breaks out of this loop while own
149 * a reference to the current mddev and must mddev_put it.
150 */
151#define ITERATE_MDDEV(mddev,tmp) \
152 \
153 for (({ spin_lock(&all_mddevs_lock); \
154 tmp = all_mddevs.next; \
155 mddev = NULL;}); \
156 ({ if (tmp != &all_mddevs) \
157 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
158 spin_unlock(&all_mddevs_lock); \
159 if (mddev) mddev_put(mddev); \
160 mddev = list_entry(tmp, mddev_t, all_mddevs); \
161 tmp != &all_mddevs;}); \
162 ({ spin_lock(&all_mddevs_lock); \
163 tmp = tmp->next;}) \
164 )
165
166
167static int md_fail_request (request_queue_t *q, struct bio *bio)
168{
169 bio_io_error(bio, bio->bi_size);
170 return 0;
171}
172
173static inline mddev_t *mddev_get(mddev_t *mddev)
174{
175 atomic_inc(&mddev->active);
176 return mddev;
177}
178
179static void mddev_put(mddev_t *mddev)
180{
181 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
182 return;
183 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
184 list_del(&mddev->all_mddevs);
185 blk_put_queue(mddev->queue);
NeilBrowneae17012005-11-08 21:39:23 -0800186 kobject_unregister(&mddev->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 }
188 spin_unlock(&all_mddevs_lock);
189}
190
191static mddev_t * mddev_find(dev_t unit)
192{
193 mddev_t *mddev, *new = NULL;
194
195 retry:
196 spin_lock(&all_mddevs_lock);
197 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
198 if (mddev->unit == unit) {
199 mddev_get(mddev);
200 spin_unlock(&all_mddevs_lock);
Jesper Juhl990a8ba2005-06-21 17:17:30 -0700201 kfree(new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 return mddev;
203 }
204
205 if (new) {
206 list_add(&new->all_mddevs, &all_mddevs);
207 spin_unlock(&all_mddevs_lock);
208 return new;
209 }
210 spin_unlock(&all_mddevs_lock);
211
212 new = (mddev_t *) kmalloc(sizeof(*new), GFP_KERNEL);
213 if (!new)
214 return NULL;
215
216 memset(new, 0, sizeof(*new));
217
218 new->unit = unit;
219 if (MAJOR(unit) == MD_MAJOR)
220 new->md_minor = MINOR(unit);
221 else
222 new->md_minor = MINOR(unit) >> MdpMinorShift;
223
224 init_MUTEX(&new->reconfig_sem);
225 INIT_LIST_HEAD(&new->disks);
226 INIT_LIST_HEAD(&new->all_mddevs);
227 init_timer(&new->safemode_timer);
228 atomic_set(&new->active, 1);
NeilBrown06d91a52005-06-21 17:17:12 -0700229 spin_lock_init(&new->write_lock);
NeilBrown3d310eb2005-06-21 17:17:26 -0700230 init_waitqueue_head(&new->sb_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
232 new->queue = blk_alloc_queue(GFP_KERNEL);
233 if (!new->queue) {
234 kfree(new);
235 return NULL;
236 }
237
238 blk_queue_make_request(new->queue, md_fail_request);
239
240 goto retry;
241}
242
243static inline int mddev_lock(mddev_t * mddev)
244{
245 return down_interruptible(&mddev->reconfig_sem);
246}
247
248static inline void mddev_lock_uninterruptible(mddev_t * mddev)
249{
250 down(&mddev->reconfig_sem);
251}
252
253static inline int mddev_trylock(mddev_t * mddev)
254{
255 return down_trylock(&mddev->reconfig_sem);
256}
257
258static inline void mddev_unlock(mddev_t * mddev)
259{
260 up(&mddev->reconfig_sem);
261
NeilBrown005eca52005-08-22 13:11:08 -0700262 md_wakeup_thread(mddev->thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263}
264
265mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
266{
267 mdk_rdev_t * rdev;
268 struct list_head *tmp;
269
270 ITERATE_RDEV(mddev,rdev,tmp) {
271 if (rdev->desc_nr == nr)
272 return rdev;
273 }
274 return NULL;
275}
276
277static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
278{
279 struct list_head *tmp;
280 mdk_rdev_t *rdev;
281
282 ITERATE_RDEV(mddev,rdev,tmp) {
283 if (rdev->bdev->bd_dev == dev)
284 return rdev;
285 }
286 return NULL;
287}
288
Jesper Juhl77933d72005-07-27 11:46:09 -0700289static inline sector_t calc_dev_sboffset(struct block_device *bdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290{
291 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
292 return MD_NEW_SIZE_BLOCKS(size);
293}
294
295static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
296{
297 sector_t size;
298
299 size = rdev->sb_offset;
300
301 if (chunk_size)
302 size &= ~((sector_t)chunk_size/1024 - 1);
303 return size;
304}
305
306static int alloc_disk_sb(mdk_rdev_t * rdev)
307{
308 if (rdev->sb_page)
309 MD_BUG();
310
311 rdev->sb_page = alloc_page(GFP_KERNEL);
312 if (!rdev->sb_page) {
313 printk(KERN_ALERT "md: out of memory.\n");
314 return -EINVAL;
315 }
316
317 return 0;
318}
319
320static void free_disk_sb(mdk_rdev_t * rdev)
321{
322 if (rdev->sb_page) {
323 page_cache_release(rdev->sb_page);
324 rdev->sb_loaded = 0;
325 rdev->sb_page = NULL;
326 rdev->sb_offset = 0;
327 rdev->size = 0;
328 }
329}
330
331
NeilBrown7bfa19f2005-06-21 17:17:28 -0700332static int super_written(struct bio *bio, unsigned int bytes_done, int error)
333{
334 mdk_rdev_t *rdev = bio->bi_private;
NeilBrowna9701a32005-11-08 21:39:34 -0800335 mddev_t *mddev = rdev->mddev;
NeilBrown7bfa19f2005-06-21 17:17:28 -0700336 if (bio->bi_size)
337 return 1;
338
339 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags))
NeilBrowna9701a32005-11-08 21:39:34 -0800340 md_error(mddev, rdev);
NeilBrown7bfa19f2005-06-21 17:17:28 -0700341
NeilBrowna9701a32005-11-08 21:39:34 -0800342 if (atomic_dec_and_test(&mddev->pending_writes))
343 wake_up(&mddev->sb_wait);
Neil Brownf8b58ed2005-06-27 22:29:34 -0700344 bio_put(bio);
NeilBrown7bfa19f2005-06-21 17:17:28 -0700345 return 0;
346}
347
NeilBrowna9701a32005-11-08 21:39:34 -0800348static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
349{
350 struct bio *bio2 = bio->bi_private;
351 mdk_rdev_t *rdev = bio2->bi_private;
352 mddev_t *mddev = rdev->mddev;
353 if (bio->bi_size)
354 return 1;
355
356 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
357 error == -EOPNOTSUPP) {
358 unsigned long flags;
359 /* barriers don't appear to be supported :-( */
360 set_bit(BarriersNotsupp, &rdev->flags);
361 mddev->barriers_work = 0;
362 spin_lock_irqsave(&mddev->write_lock, flags);
363 bio2->bi_next = mddev->biolist;
364 mddev->biolist = bio2;
365 spin_unlock_irqrestore(&mddev->write_lock, flags);
366 wake_up(&mddev->sb_wait);
367 bio_put(bio);
368 return 0;
369 }
370 bio_put(bio2);
371 bio->bi_private = rdev;
372 return super_written(bio, bytes_done, error);
373}
374
NeilBrown7bfa19f2005-06-21 17:17:28 -0700375void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
376 sector_t sector, int size, struct page *page)
377{
378 /* write first size bytes of page to sector of rdev
379 * Increment mddev->pending_writes before returning
380 * and decrement it on completion, waking up sb_wait
381 * if zero is reached.
382 * If an error occurred, call md_error
NeilBrowna9701a32005-11-08 21:39:34 -0800383 *
384 * As we might need to resubmit the request if BIO_RW_BARRIER
385 * causes ENOTSUPP, we allocate a spare bio...
NeilBrown7bfa19f2005-06-21 17:17:28 -0700386 */
387 struct bio *bio = bio_alloc(GFP_NOIO, 1);
NeilBrowna9701a32005-11-08 21:39:34 -0800388 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
NeilBrown7bfa19f2005-06-21 17:17:28 -0700389
390 bio->bi_bdev = rdev->bdev;
391 bio->bi_sector = sector;
392 bio_add_page(bio, page, size, 0);
393 bio->bi_private = rdev;
394 bio->bi_end_io = super_written;
NeilBrowna9701a32005-11-08 21:39:34 -0800395 bio->bi_rw = rw;
396
NeilBrown7bfa19f2005-06-21 17:17:28 -0700397 atomic_inc(&mddev->pending_writes);
NeilBrowna9701a32005-11-08 21:39:34 -0800398 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
399 struct bio *rbio;
400 rw |= (1<<BIO_RW_BARRIER);
401 rbio = bio_clone(bio, GFP_NOIO);
402 rbio->bi_private = bio;
403 rbio->bi_end_io = super_written_barrier;
404 submit_bio(rw, rbio);
405 } else
406 submit_bio(rw, bio);
407}
408
409void md_super_wait(mddev_t *mddev)
410{
411 /* wait for all superblock writes that were scheduled to complete.
412 * if any had to be retried (due to BARRIER problems), retry them
413 */
414 DEFINE_WAIT(wq);
415 for(;;) {
416 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
417 if (atomic_read(&mddev->pending_writes)==0)
418 break;
419 while (mddev->biolist) {
420 struct bio *bio;
421 spin_lock_irq(&mddev->write_lock);
422 bio = mddev->biolist;
423 mddev->biolist = bio->bi_next ;
424 bio->bi_next = NULL;
425 spin_unlock_irq(&mddev->write_lock);
426 submit_bio(bio->bi_rw, bio);
427 }
428 schedule();
429 }
430 finish_wait(&mddev->sb_wait, &wq);
NeilBrown7bfa19f2005-06-21 17:17:28 -0700431}
432
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
434{
435 if (bio->bi_size)
436 return 1;
437
438 complete((struct completion*)bio->bi_private);
439 return 0;
440}
441
NeilBrowna654b9d82005-06-21 17:17:27 -0700442int sync_page_io(struct block_device *bdev, sector_t sector, int size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 struct page *page, int rw)
444{
Neil Brownbaaa2c52005-04-16 15:23:54 -0700445 struct bio *bio = bio_alloc(GFP_NOIO, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 struct completion event;
447 int ret;
448
449 rw |= (1 << BIO_RW_SYNC);
450
451 bio->bi_bdev = bdev;
452 bio->bi_sector = sector;
453 bio_add_page(bio, page, size, 0);
454 init_completion(&event);
455 bio->bi_private = &event;
456 bio->bi_end_io = bi_complete;
457 submit_bio(rw, bio);
458 wait_for_completion(&event);
459
460 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
461 bio_put(bio);
462 return ret;
463}
464
NeilBrown0002b272005-09-09 16:23:53 -0700465static int read_disk_sb(mdk_rdev_t * rdev, int size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466{
467 char b[BDEVNAME_SIZE];
468 if (!rdev->sb_page) {
469 MD_BUG();
470 return -EINVAL;
471 }
472 if (rdev->sb_loaded)
473 return 0;
474
475
NeilBrown0002b272005-09-09 16:23:53 -0700476 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 goto fail;
478 rdev->sb_loaded = 1;
479 return 0;
480
481fail:
482 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
483 bdevname(rdev->bdev,b));
484 return -EINVAL;
485}
486
487static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
488{
489 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
490 (sb1->set_uuid1 == sb2->set_uuid1) &&
491 (sb1->set_uuid2 == sb2->set_uuid2) &&
492 (sb1->set_uuid3 == sb2->set_uuid3))
493
494 return 1;
495
496 return 0;
497}
498
499
500static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
501{
502 int ret;
503 mdp_super_t *tmp1, *tmp2;
504
505 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
506 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
507
508 if (!tmp1 || !tmp2) {
509 ret = 0;
510 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
511 goto abort;
512 }
513
514 *tmp1 = *sb1;
515 *tmp2 = *sb2;
516
517 /*
518 * nr_disks is not constant
519 */
520 tmp1->nr_disks = 0;
521 tmp2->nr_disks = 0;
522
523 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
524 ret = 0;
525 else
526 ret = 1;
527
528abort:
Jesper Juhl990a8ba2005-06-21 17:17:30 -0700529 kfree(tmp1);
530 kfree(tmp2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 return ret;
532}
533
534static unsigned int calc_sb_csum(mdp_super_t * sb)
535{
536 unsigned int disk_csum, csum;
537
538 disk_csum = sb->sb_csum;
539 sb->sb_csum = 0;
540 csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
541 sb->sb_csum = disk_csum;
542 return csum;
543}
544
545
546/*
547 * Handle superblock details.
548 * We want to be able to handle multiple superblock formats
549 * so we have a common interface to them all, and an array of
550 * different handlers.
551 * We rely on user-space to write the initial superblock, and support
552 * reading and updating of superblocks.
553 * Interface methods are:
554 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
555 * loads and validates a superblock on dev.
556 * if refdev != NULL, compare superblocks on both devices
557 * Return:
558 * 0 - dev has a superblock that is compatible with refdev
559 * 1 - dev has a superblock that is compatible and newer than refdev
560 * so dev should be used as the refdev in future
561 * -EINVAL superblock incompatible or invalid
562 * -othererror e.g. -EIO
563 *
564 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
565 * Verify that dev is acceptable into mddev.
566 * The first time, mddev->raid_disks will be 0, and data from
567 * dev should be merged in. Subsequent calls check that dev
568 * is new enough. Return 0 or -EINVAL
569 *
570 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
571 * Update the superblock for rdev with data in mddev
572 * This does not write to disc.
573 *
574 */
575
576struct super_type {
577 char *name;
578 struct module *owner;
579 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
580 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
581 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
582};
583
584/*
585 * load_super for 0.90.0
586 */
587static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
588{
589 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
590 mdp_super_t *sb;
591 int ret;
592 sector_t sb_offset;
593
594 /*
595 * Calculate the position of the superblock,
596 * it's at the end of the disk.
597 *
598 * It also happens to be a multiple of 4Kb.
599 */
600 sb_offset = calc_dev_sboffset(rdev->bdev);
601 rdev->sb_offset = sb_offset;
602
NeilBrown0002b272005-09-09 16:23:53 -0700603 ret = read_disk_sb(rdev, MD_SB_BYTES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 if (ret) return ret;
605
606 ret = -EINVAL;
607
608 bdevname(rdev->bdev, b);
609 sb = (mdp_super_t*)page_address(rdev->sb_page);
610
611 if (sb->md_magic != MD_SB_MAGIC) {
612 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
613 b);
614 goto abort;
615 }
616
617 if (sb->major_version != 0 ||
618 sb->minor_version != 90) {
619 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
620 sb->major_version, sb->minor_version,
621 b);
622 goto abort;
623 }
624
625 if (sb->raid_disks <= 0)
626 goto abort;
627
628 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
629 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
630 b);
631 goto abort;
632 }
633
634 rdev->preferred_minor = sb->md_minor;
635 rdev->data_offset = 0;
NeilBrown0002b272005-09-09 16:23:53 -0700636 rdev->sb_size = MD_SB_BYTES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637
638 if (sb->level == LEVEL_MULTIPATH)
639 rdev->desc_nr = -1;
640 else
641 rdev->desc_nr = sb->this_disk.number;
642
643 if (refdev == 0)
644 ret = 1;
645 else {
646 __u64 ev1, ev2;
647 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
648 if (!uuid_equal(refsb, sb)) {
649 printk(KERN_WARNING "md: %s has different UUID to %s\n",
650 b, bdevname(refdev->bdev,b2));
651 goto abort;
652 }
653 if (!sb_equal(refsb, sb)) {
654 printk(KERN_WARNING "md: %s has same UUID"
655 " but different superblock to %s\n",
656 b, bdevname(refdev->bdev, b2));
657 goto abort;
658 }
659 ev1 = md_event(sb);
660 ev2 = md_event(refsb);
661 if (ev1 > ev2)
662 ret = 1;
663 else
664 ret = 0;
665 }
666 rdev->size = calc_dev_size(rdev, sb->chunk_size);
667
668 abort:
669 return ret;
670}
671
672/*
673 * validate_super for 0.90.0
674 */
675static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
676{
677 mdp_disk_t *desc;
678 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
679
NeilBrown41158c72005-06-21 17:17:25 -0700680 rdev->raid_disk = -1;
NeilBrownb2d444d2005-11-08 21:39:31 -0800681 rdev->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 if (mddev->raid_disks == 0) {
683 mddev->major_version = 0;
684 mddev->minor_version = sb->minor_version;
685 mddev->patch_version = sb->patch_version;
686 mddev->persistent = ! sb->not_persistent;
687 mddev->chunk_size = sb->chunk_size;
688 mddev->ctime = sb->ctime;
689 mddev->utime = sb->utime;
690 mddev->level = sb->level;
691 mddev->layout = sb->layout;
692 mddev->raid_disks = sb->raid_disks;
693 mddev->size = sb->size;
694 mddev->events = md_event(sb);
NeilBrown92232142005-08-18 11:24:16 -0700695 mddev->bitmap_offset = 0;
NeilBrown36fa3062005-09-09 16:23:45 -0700696 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697
698 if (sb->state & (1<<MD_SB_CLEAN))
699 mddev->recovery_cp = MaxSector;
700 else {
701 if (sb->events_hi == sb->cp_events_hi &&
702 sb->events_lo == sb->cp_events_lo) {
703 mddev->recovery_cp = sb->recovery_cp;
704 } else
705 mddev->recovery_cp = 0;
706 }
707
708 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
709 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
710 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
711 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
712
713 mddev->max_disks = MD_SB_DISKS;
NeilBrowna654b9d82005-06-21 17:17:27 -0700714
715 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
716 mddev->bitmap_file == NULL) {
NeilBrown934ce7c2005-09-09 16:23:55 -0700717 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6) {
NeilBrowna654b9d82005-06-21 17:17:27 -0700718 /* FIXME use a better test */
719 printk(KERN_WARNING "md: bitmaps only support for raid1\n");
720 return -EINVAL;
721 }
NeilBrown36fa3062005-09-09 16:23:45 -0700722 mddev->bitmap_offset = mddev->default_bitmap_offset;
NeilBrowna654b9d82005-06-21 17:17:27 -0700723 }
724
NeilBrown41158c72005-06-21 17:17:25 -0700725 } else if (mddev->pers == NULL) {
726 /* Insist on good event counter while assembling */
727 __u64 ev1 = md_event(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 ++ev1;
729 if (ev1 < mddev->events)
730 return -EINVAL;
NeilBrown41158c72005-06-21 17:17:25 -0700731 } else if (mddev->bitmap) {
732 /* if adding to array with a bitmap, then we can accept an
733 * older device ... but not too old.
734 */
735 __u64 ev1 = md_event(sb);
736 if (ev1 < mddev->bitmap->events_cleared)
737 return 0;
738 } else /* just a hot-add of a new device, leave raid_disk at -1 */
739 return 0;
740
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 if (mddev->level != LEVEL_MULTIPATH) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 desc = sb->disks + rdev->desc_nr;
743
744 if (desc->state & (1<<MD_DISK_FAULTY))
NeilBrownb2d444d2005-11-08 21:39:31 -0800745 set_bit(Faulty, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 else if (desc->state & (1<<MD_DISK_SYNC) &&
747 desc->raid_disk < mddev->raid_disks) {
NeilBrownb2d444d2005-11-08 21:39:31 -0800748 set_bit(In_sync, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 rdev->raid_disk = desc->raid_disk;
750 }
NeilBrown8ddf9ef2005-09-09 16:23:45 -0700751 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
752 set_bit(WriteMostly, &rdev->flags);
NeilBrown41158c72005-06-21 17:17:25 -0700753 } else /* MULTIPATH are always insync */
NeilBrownb2d444d2005-11-08 21:39:31 -0800754 set_bit(In_sync, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 return 0;
756}
757
758/*
759 * sync_super for 0.90.0
760 */
761static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
762{
763 mdp_super_t *sb;
764 struct list_head *tmp;
765 mdk_rdev_t *rdev2;
766 int next_spare = mddev->raid_disks;
NeilBrown19133a42005-11-08 21:39:35 -0800767
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768
769 /* make rdev->sb match mddev data..
770 *
771 * 1/ zero out disks
772 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
773 * 3/ any empty disks < next_spare become removed
774 *
775 * disks[0] gets initialised to REMOVED because
776 * we cannot be sure from other fields if it has
777 * been initialised or not.
778 */
779 int i;
780 int active=0, working=0,failed=0,spare=0,nr_disks=0;
781
NeilBrown61181562005-09-09 16:24:02 -0700782 rdev->sb_size = MD_SB_BYTES;
783
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 sb = (mdp_super_t*)page_address(rdev->sb_page);
785
786 memset(sb, 0, sizeof(*sb));
787
788 sb->md_magic = MD_SB_MAGIC;
789 sb->major_version = mddev->major_version;
790 sb->minor_version = mddev->minor_version;
791 sb->patch_version = mddev->patch_version;
792 sb->gvalid_words = 0; /* ignored */
793 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
794 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
795 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
796 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
797
798 sb->ctime = mddev->ctime;
799 sb->level = mddev->level;
800 sb->size = mddev->size;
801 sb->raid_disks = mddev->raid_disks;
802 sb->md_minor = mddev->md_minor;
803 sb->not_persistent = !mddev->persistent;
804 sb->utime = mddev->utime;
805 sb->state = 0;
806 sb->events_hi = (mddev->events>>32);
807 sb->events_lo = (u32)mddev->events;
808
809 if (mddev->in_sync)
810 {
811 sb->recovery_cp = mddev->recovery_cp;
812 sb->cp_events_hi = (mddev->events>>32);
813 sb->cp_events_lo = (u32)mddev->events;
814 if (mddev->recovery_cp == MaxSector)
815 sb->state = (1<< MD_SB_CLEAN);
816 } else
817 sb->recovery_cp = 0;
818
819 sb->layout = mddev->layout;
820 sb->chunk_size = mddev->chunk_size;
821
NeilBrowna654b9d82005-06-21 17:17:27 -0700822 if (mddev->bitmap && mddev->bitmap_file == NULL)
823 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
824
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 sb->disks[0].state = (1<<MD_DISK_REMOVED);
826 ITERATE_RDEV(mddev,rdev2,tmp) {
827 mdp_disk_t *d;
NeilBrown86e6ffd2005-11-08 21:39:24 -0800828 int desc_nr;
NeilBrownb2d444d2005-11-08 21:39:31 -0800829 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
830 && !test_bit(Faulty, &rdev2->flags))
NeilBrown86e6ffd2005-11-08 21:39:24 -0800831 desc_nr = rdev2->raid_disk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 else
NeilBrown86e6ffd2005-11-08 21:39:24 -0800833 desc_nr = next_spare++;
NeilBrown19133a42005-11-08 21:39:35 -0800834 rdev2->desc_nr = desc_nr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 d = &sb->disks[rdev2->desc_nr];
836 nr_disks++;
837 d->number = rdev2->desc_nr;
838 d->major = MAJOR(rdev2->bdev->bd_dev);
839 d->minor = MINOR(rdev2->bdev->bd_dev);
NeilBrownb2d444d2005-11-08 21:39:31 -0800840 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
841 && !test_bit(Faulty, &rdev2->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 d->raid_disk = rdev2->raid_disk;
843 else
844 d->raid_disk = rdev2->desc_nr; /* compatibility */
NeilBrownb2d444d2005-11-08 21:39:31 -0800845 if (test_bit(Faulty, &rdev2->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 d->state = (1<<MD_DISK_FAULTY);
847 failed++;
NeilBrownb2d444d2005-11-08 21:39:31 -0800848 } else if (test_bit(In_sync, &rdev2->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 d->state = (1<<MD_DISK_ACTIVE);
850 d->state |= (1<<MD_DISK_SYNC);
851 active++;
852 working++;
853 } else {
854 d->state = 0;
855 spare++;
856 working++;
857 }
NeilBrown8ddf9ef2005-09-09 16:23:45 -0700858 if (test_bit(WriteMostly, &rdev2->flags))
859 d->state |= (1<<MD_DISK_WRITEMOSTLY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 /* now set the "removed" and "faulty" bits on any missing devices */
862 for (i=0 ; i < mddev->raid_disks ; i++) {
863 mdp_disk_t *d = &sb->disks[i];
864 if (d->state == 0 && d->number == 0) {
865 d->number = i;
866 d->raid_disk = i;
867 d->state = (1<<MD_DISK_REMOVED);
868 d->state |= (1<<MD_DISK_FAULTY);
869 failed++;
870 }
871 }
872 sb->nr_disks = nr_disks;
873 sb->active_disks = active;
874 sb->working_disks = working;
875 sb->failed_disks = failed;
876 sb->spare_disks = spare;
877
878 sb->this_disk = sb->disks[rdev->desc_nr];
879 sb->sb_csum = calc_sb_csum(sb);
880}
881
882/*
883 * version 1 superblock
884 */
885
886static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
887{
888 unsigned int disk_csum, csum;
889 unsigned long long newcsum;
890 int size = 256 + le32_to_cpu(sb->max_dev)*2;
891 unsigned int *isuper = (unsigned int*)sb;
892 int i;
893
894 disk_csum = sb->sb_csum;
895 sb->sb_csum = 0;
896 newcsum = 0;
897 for (i=0; size>=4; size -= 4 )
898 newcsum += le32_to_cpu(*isuper++);
899
900 if (size == 2)
901 newcsum += le16_to_cpu(*(unsigned short*) isuper);
902
903 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
904 sb->sb_csum = disk_csum;
905 return cpu_to_le32(csum);
906}
907
908static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
909{
910 struct mdp_superblock_1 *sb;
911 int ret;
912 sector_t sb_offset;
913 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
NeilBrown0002b272005-09-09 16:23:53 -0700914 int bmask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915
916 /*
917 * Calculate the position of the superblock.
918 * It is always aligned to a 4K boundary and
919 * depeding on minor_version, it can be:
920 * 0: At least 8K, but less than 12K, from end of device
921 * 1: At start of device
922 * 2: 4K from start of device.
923 */
924 switch(minor_version) {
925 case 0:
926 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
927 sb_offset -= 8*2;
NeilBrown39730962005-06-21 17:17:28 -0700928 sb_offset &= ~(sector_t)(4*2-1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 /* convert from sectors to K */
930 sb_offset /= 2;
931 break;
932 case 1:
933 sb_offset = 0;
934 break;
935 case 2:
936 sb_offset = 4;
937 break;
938 default:
939 return -EINVAL;
940 }
941 rdev->sb_offset = sb_offset;
942
NeilBrown0002b272005-09-09 16:23:53 -0700943 /* superblock is rarely larger than 1K, but it can be larger,
944 * and it is safe to read 4k, so we do that
945 */
946 ret = read_disk_sb(rdev, 4096);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 if (ret) return ret;
948
949
950 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
951
952 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
953 sb->major_version != cpu_to_le32(1) ||
954 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
955 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
NeilBrown71c08052005-09-09 16:23:51 -0700956 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 return -EINVAL;
958
959 if (calc_sb_1_csum(sb) != sb->sb_csum) {
960 printk("md: invalid superblock checksum on %s\n",
961 bdevname(rdev->bdev,b));
962 return -EINVAL;
963 }
964 if (le64_to_cpu(sb->data_size) < 10) {
965 printk("md: data_size too small on %s\n",
966 bdevname(rdev->bdev,b));
967 return -EINVAL;
968 }
969 rdev->preferred_minor = 0xffff;
970 rdev->data_offset = le64_to_cpu(sb->data_offset);
971
NeilBrown0002b272005-09-09 16:23:53 -0700972 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
NeilBrown720a3dc2005-09-09 16:23:59 -0700973 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
NeilBrown0002b272005-09-09 16:23:53 -0700974 if (rdev->sb_size & bmask)
975 rdev-> sb_size = (rdev->sb_size | bmask)+1;
976
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 if (refdev == 0)
978 return 1;
979 else {
980 __u64 ev1, ev2;
981 struct mdp_superblock_1 *refsb =
982 (struct mdp_superblock_1*)page_address(refdev->sb_page);
983
984 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
985 sb->level != refsb->level ||
986 sb->layout != refsb->layout ||
987 sb->chunksize != refsb->chunksize) {
988 printk(KERN_WARNING "md: %s has strangely different"
989 " superblock to %s\n",
990 bdevname(rdev->bdev,b),
991 bdevname(refdev->bdev,b2));
992 return -EINVAL;
993 }
994 ev1 = le64_to_cpu(sb->events);
995 ev2 = le64_to_cpu(refsb->events);
996
997 if (ev1 > ev2)
998 return 1;
999 }
1000 if (minor_version)
1001 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1002 else
1003 rdev->size = rdev->sb_offset;
1004 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1005 return -EINVAL;
1006 rdev->size = le64_to_cpu(sb->data_size)/2;
1007 if (le32_to_cpu(sb->chunksize))
1008 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1009 return 0;
1010}
1011
1012static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1013{
1014 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1015
NeilBrown41158c72005-06-21 17:17:25 -07001016 rdev->raid_disk = -1;
NeilBrownb2d444d2005-11-08 21:39:31 -08001017 rdev->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 if (mddev->raid_disks == 0) {
1019 mddev->major_version = 1;
1020 mddev->patch_version = 0;
1021 mddev->persistent = 1;
1022 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1023 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1024 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1025 mddev->level = le32_to_cpu(sb->level);
1026 mddev->layout = le32_to_cpu(sb->layout);
1027 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1028 mddev->size = le64_to_cpu(sb->size)/2;
1029 mddev->events = le64_to_cpu(sb->events);
NeilBrown92232142005-08-18 11:24:16 -07001030 mddev->bitmap_offset = 0;
NeilBrown36fa3062005-09-09 16:23:45 -07001031 mddev->default_bitmap_offset = 0;
NeilBrown53e87fb2005-09-09 16:23:58 -07001032 mddev->default_bitmap_offset = 1024;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033
1034 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1035 memcpy(mddev->uuid, sb->set_uuid, 16);
1036
1037 mddev->max_disks = (4096-256)/2;
NeilBrowna654b9d82005-06-21 17:17:27 -07001038
NeilBrown71c08052005-09-09 16:23:51 -07001039 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
NeilBrowna654b9d82005-06-21 17:17:27 -07001040 mddev->bitmap_file == NULL ) {
1041 if (mddev->level != 1) {
1042 printk(KERN_WARNING "md: bitmaps only supported for raid1\n");
1043 return -EINVAL;
1044 }
1045 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1046 }
NeilBrown41158c72005-06-21 17:17:25 -07001047 } else if (mddev->pers == NULL) {
1048 /* Insist of good event counter while assembling */
1049 __u64 ev1 = le64_to_cpu(sb->events);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 ++ev1;
1051 if (ev1 < mddev->events)
1052 return -EINVAL;
NeilBrown41158c72005-06-21 17:17:25 -07001053 } else if (mddev->bitmap) {
1054 /* If adding to array with a bitmap, then we can accept an
1055 * older device, but not too old.
1056 */
1057 __u64 ev1 = le64_to_cpu(sb->events);
1058 if (ev1 < mddev->bitmap->events_cleared)
1059 return 0;
1060 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1061 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062
1063 if (mddev->level != LEVEL_MULTIPATH) {
1064 int role;
1065 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1066 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1067 switch(role) {
1068 case 0xffff: /* spare */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 break;
1070 case 0xfffe: /* faulty */
NeilBrownb2d444d2005-11-08 21:39:31 -08001071 set_bit(Faulty, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 break;
1073 default:
NeilBrownb2d444d2005-11-08 21:39:31 -08001074 set_bit(In_sync, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 rdev->raid_disk = role;
1076 break;
1077 }
NeilBrown8ddf9ef2005-09-09 16:23:45 -07001078 if (sb->devflags & WriteMostly1)
1079 set_bit(WriteMostly, &rdev->flags);
NeilBrown41158c72005-06-21 17:17:25 -07001080 } else /* MULTIPATH are always insync */
NeilBrownb2d444d2005-11-08 21:39:31 -08001081 set_bit(In_sync, &rdev->flags);
NeilBrown41158c72005-06-21 17:17:25 -07001082
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 return 0;
1084}
1085
1086static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1087{
1088 struct mdp_superblock_1 *sb;
1089 struct list_head *tmp;
1090 mdk_rdev_t *rdev2;
1091 int max_dev, i;
1092 /* make rdev->sb match mddev and rdev data. */
1093
1094 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1095
1096 sb->feature_map = 0;
1097 sb->pad0 = 0;
1098 memset(sb->pad1, 0, sizeof(sb->pad1));
1099 memset(sb->pad2, 0, sizeof(sb->pad2));
1100 memset(sb->pad3, 0, sizeof(sb->pad3));
1101
1102 sb->utime = cpu_to_le64((__u64)mddev->utime);
1103 sb->events = cpu_to_le64(mddev->events);
1104 if (mddev->in_sync)
1105 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1106 else
1107 sb->resync_offset = cpu_to_le64(0);
1108
NeilBrowna654b9d82005-06-21 17:17:27 -07001109 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1110 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
NeilBrown71c08052005-09-09 16:23:51 -07001111 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
NeilBrowna654b9d82005-06-21 17:17:27 -07001112 }
1113
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 max_dev = 0;
1115 ITERATE_RDEV(mddev,rdev2,tmp)
1116 if (rdev2->desc_nr+1 > max_dev)
1117 max_dev = rdev2->desc_nr+1;
1118
1119 sb->max_dev = cpu_to_le32(max_dev);
1120 for (i=0; i<max_dev;i++)
1121 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1122
1123 ITERATE_RDEV(mddev,rdev2,tmp) {
1124 i = rdev2->desc_nr;
NeilBrownb2d444d2005-11-08 21:39:31 -08001125 if (test_bit(Faulty, &rdev2->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 sb->dev_roles[i] = cpu_to_le16(0xfffe);
NeilBrownb2d444d2005-11-08 21:39:31 -08001127 else if (test_bit(In_sync, &rdev2->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1129 else
1130 sb->dev_roles[i] = cpu_to_le16(0xffff);
1131 }
1132
1133 sb->recovery_offset = cpu_to_le64(0); /* not supported yet */
1134 sb->sb_csum = calc_sb_1_csum(sb);
1135}
1136
1137
Adrian Bunk75c96f82005-05-05 16:16:09 -07001138static struct super_type super_types[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 [0] = {
1140 .name = "0.90.0",
1141 .owner = THIS_MODULE,
1142 .load_super = super_90_load,
1143 .validate_super = super_90_validate,
1144 .sync_super = super_90_sync,
1145 },
1146 [1] = {
1147 .name = "md-1",
1148 .owner = THIS_MODULE,
1149 .load_super = super_1_load,
1150 .validate_super = super_1_validate,
1151 .sync_super = super_1_sync,
1152 },
1153};
1154
1155static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1156{
1157 struct list_head *tmp;
1158 mdk_rdev_t *rdev;
1159
1160 ITERATE_RDEV(mddev,rdev,tmp)
1161 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1162 return rdev;
1163
1164 return NULL;
1165}
1166
1167static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1168{
1169 struct list_head *tmp;
1170 mdk_rdev_t *rdev;
1171
1172 ITERATE_RDEV(mddev1,rdev,tmp)
1173 if (match_dev_unit(mddev2, rdev))
1174 return 1;
1175
1176 return 0;
1177}
1178
1179static LIST_HEAD(pending_raid_disks);
1180
1181static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1182{
1183 mdk_rdev_t *same_pdev;
1184 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
NeilBrownf637b9f2005-11-08 21:39:37 -08001185 struct kobject *ko;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186
1187 if (rdev->mddev) {
1188 MD_BUG();
1189 return -EINVAL;
1190 }
1191 same_pdev = match_dev_unit(mddev, rdev);
1192 if (same_pdev)
1193 printk(KERN_WARNING
1194 "%s: WARNING: %s appears to be on the same physical"
1195 " disk as %s. True\n protection against single-disk"
1196 " failure might be compromised.\n",
1197 mdname(mddev), bdevname(rdev->bdev,b),
1198 bdevname(same_pdev->bdev,b2));
1199
1200 /* Verify rdev->desc_nr is unique.
1201 * If it is -1, assign a free number, else
1202 * check number is not in use
1203 */
1204 if (rdev->desc_nr < 0) {
1205 int choice = 0;
1206 if (mddev->pers) choice = mddev->raid_disks;
1207 while (find_rdev_nr(mddev, choice))
1208 choice++;
1209 rdev->desc_nr = choice;
1210 } else {
1211 if (find_rdev_nr(mddev, rdev->desc_nr))
1212 return -EBUSY;
1213 }
NeilBrown19133a42005-11-08 21:39:35 -08001214 bdevname(rdev->bdev,b);
1215 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1216 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217
1218 list_add(&rdev->same_set, &mddev->disks);
1219 rdev->mddev = mddev;
NeilBrown19133a42005-11-08 21:39:35 -08001220 printk(KERN_INFO "md: bind<%s>\n", b);
NeilBrown86e6ffd2005-11-08 21:39:24 -08001221
NeilBrown9c791972005-11-08 21:39:28 -08001222 rdev->kobj.parent = &mddev->kobj;
NeilBrown86e6ffd2005-11-08 21:39:24 -08001223 kobject_add(&rdev->kobj);
1224
NeilBrownf637b9f2005-11-08 21:39:37 -08001225 if (rdev->bdev->bd_part)
1226 ko = &rdev->bdev->bd_part->kobj;
1227 else
1228 ko = &rdev->bdev->bd_disk->kobj;
1229 sysfs_create_link(&rdev->kobj, ko, "block");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230 return 0;
1231}
1232
1233static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1234{
1235 char b[BDEVNAME_SIZE];
1236 if (!rdev->mddev) {
1237 MD_BUG();
1238 return;
1239 }
1240 list_del_init(&rdev->same_set);
1241 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1242 rdev->mddev = NULL;
NeilBrown86e6ffd2005-11-08 21:39:24 -08001243 sysfs_remove_link(&rdev->kobj, "block");
1244 kobject_del(&rdev->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245}
1246
1247/*
1248 * prevent the device from being mounted, repartitioned or
1249 * otherwise reused by a RAID array (or any other kernel
1250 * subsystem), by bd_claiming the device.
1251 */
1252static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1253{
1254 int err = 0;
1255 struct block_device *bdev;
1256 char b[BDEVNAME_SIZE];
1257
1258 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1259 if (IS_ERR(bdev)) {
1260 printk(KERN_ERR "md: could not open %s.\n",
1261 __bdevname(dev, b));
1262 return PTR_ERR(bdev);
1263 }
1264 err = bd_claim(bdev, rdev);
1265 if (err) {
1266 printk(KERN_ERR "md: could not bd_claim %s.\n",
1267 bdevname(bdev, b));
1268 blkdev_put(bdev);
1269 return err;
1270 }
1271 rdev->bdev = bdev;
1272 return err;
1273}
1274
1275static void unlock_rdev(mdk_rdev_t *rdev)
1276{
1277 struct block_device *bdev = rdev->bdev;
1278 rdev->bdev = NULL;
1279 if (!bdev)
1280 MD_BUG();
1281 bd_release(bdev);
1282 blkdev_put(bdev);
1283}
1284
1285void md_autodetect_dev(dev_t dev);
1286
1287static void export_rdev(mdk_rdev_t * rdev)
1288{
1289 char b[BDEVNAME_SIZE];
1290 printk(KERN_INFO "md: export_rdev(%s)\n",
1291 bdevname(rdev->bdev,b));
1292 if (rdev->mddev)
1293 MD_BUG();
1294 free_disk_sb(rdev);
1295 list_del_init(&rdev->same_set);
1296#ifndef MODULE
1297 md_autodetect_dev(rdev->bdev->bd_dev);
1298#endif
1299 unlock_rdev(rdev);
NeilBrown86e6ffd2005-11-08 21:39:24 -08001300 kobject_put(&rdev->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301}
1302
1303static void kick_rdev_from_array(mdk_rdev_t * rdev)
1304{
1305 unbind_rdev_from_array(rdev);
1306 export_rdev(rdev);
1307}
1308
1309static void export_array(mddev_t *mddev)
1310{
1311 struct list_head *tmp;
1312 mdk_rdev_t *rdev;
1313
1314 ITERATE_RDEV(mddev,rdev,tmp) {
1315 if (!rdev->mddev) {
1316 MD_BUG();
1317 continue;
1318 }
1319 kick_rdev_from_array(rdev);
1320 }
1321 if (!list_empty(&mddev->disks))
1322 MD_BUG();
1323 mddev->raid_disks = 0;
1324 mddev->major_version = 0;
1325}
1326
1327static void print_desc(mdp_disk_t *desc)
1328{
1329 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1330 desc->major,desc->minor,desc->raid_disk,desc->state);
1331}
1332
1333static void print_sb(mdp_super_t *sb)
1334{
1335 int i;
1336
1337 printk(KERN_INFO
1338 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1339 sb->major_version, sb->minor_version, sb->patch_version,
1340 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1341 sb->ctime);
1342 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1343 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1344 sb->md_minor, sb->layout, sb->chunk_size);
1345 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1346 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1347 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1348 sb->failed_disks, sb->spare_disks,
1349 sb->sb_csum, (unsigned long)sb->events_lo);
1350
1351 printk(KERN_INFO);
1352 for (i = 0; i < MD_SB_DISKS; i++) {
1353 mdp_disk_t *desc;
1354
1355 desc = sb->disks + i;
1356 if (desc->number || desc->major || desc->minor ||
1357 desc->raid_disk || (desc->state && (desc->state != 4))) {
1358 printk(" D %2d: ", i);
1359 print_desc(desc);
1360 }
1361 }
1362 printk(KERN_INFO "md: THIS: ");
1363 print_desc(&sb->this_disk);
1364
1365}
1366
1367static void print_rdev(mdk_rdev_t *rdev)
1368{
1369 char b[BDEVNAME_SIZE];
1370 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1371 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
NeilBrownb2d444d2005-11-08 21:39:31 -08001372 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1373 rdev->desc_nr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 if (rdev->sb_loaded) {
1375 printk(KERN_INFO "md: rdev superblock:\n");
1376 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1377 } else
1378 printk(KERN_INFO "md: no rdev superblock!\n");
1379}
1380
1381void md_print_devices(void)
1382{
1383 struct list_head *tmp, *tmp2;
1384 mdk_rdev_t *rdev;
1385 mddev_t *mddev;
1386 char b[BDEVNAME_SIZE];
1387
1388 printk("\n");
1389 printk("md: **********************************\n");
1390 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1391 printk("md: **********************************\n");
1392 ITERATE_MDDEV(mddev,tmp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393
NeilBrown32a76272005-06-21 17:17:14 -07001394 if (mddev->bitmap)
1395 bitmap_print_sb(mddev->bitmap);
1396 else
1397 printk("%s: ", mdname(mddev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 ITERATE_RDEV(mddev,rdev,tmp2)
1399 printk("<%s>", bdevname(rdev->bdev,b));
1400 printk("\n");
1401
1402 ITERATE_RDEV(mddev,rdev,tmp2)
1403 print_rdev(rdev);
1404 }
1405 printk("md: **********************************\n");
1406 printk("\n");
1407}
1408
1409
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410static void sync_sbs(mddev_t * mddev)
1411{
1412 mdk_rdev_t *rdev;
1413 struct list_head *tmp;
1414
1415 ITERATE_RDEV(mddev,rdev,tmp) {
1416 super_types[mddev->major_version].
1417 sync_super(mddev, rdev);
1418 rdev->sb_loaded = 1;
1419 }
1420}
1421
1422static void md_update_sb(mddev_t * mddev)
1423{
NeilBrown7bfa19f2005-06-21 17:17:28 -07001424 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425 struct list_head *tmp;
1426 mdk_rdev_t *rdev;
NeilBrown06d91a52005-06-21 17:17:12 -07001427 int sync_req;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429repeat:
NeilBrowna9701a32005-11-08 21:39:34 -08001430 spin_lock_irq(&mddev->write_lock);
NeilBrown06d91a52005-06-21 17:17:12 -07001431 sync_req = mddev->in_sync;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432 mddev->utime = get_seconds();
1433 mddev->events ++;
1434
1435 if (!mddev->events) {
1436 /*
1437 * oops, this 64-bit counter should never wrap.
1438 * Either we are in around ~1 trillion A.C., assuming
1439 * 1 reboot per second, or we have a bug:
1440 */
1441 MD_BUG();
1442 mddev->events --;
1443 }
NeilBrown7bfa19f2005-06-21 17:17:28 -07001444 mddev->sb_dirty = 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445 sync_sbs(mddev);
1446
1447 /*
1448 * do not write anything to disk if using
1449 * nonpersistent superblocks
1450 */
NeilBrown06d91a52005-06-21 17:17:12 -07001451 if (!mddev->persistent) {
1452 mddev->sb_dirty = 0;
NeilBrowna9701a32005-11-08 21:39:34 -08001453 spin_unlock_irq(&mddev->write_lock);
NeilBrown3d310eb2005-06-21 17:17:26 -07001454 wake_up(&mddev->sb_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455 return;
NeilBrown06d91a52005-06-21 17:17:12 -07001456 }
NeilBrowna9701a32005-11-08 21:39:34 -08001457 spin_unlock_irq(&mddev->write_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458
1459 dprintk(KERN_INFO
1460 "md: updating %s RAID superblock on device (in sync %d)\n",
1461 mdname(mddev),mddev->in_sync);
1462
NeilBrown32a76272005-06-21 17:17:14 -07001463 err = bitmap_update_sb(mddev->bitmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464 ITERATE_RDEV(mddev,rdev,tmp) {
1465 char b[BDEVNAME_SIZE];
1466 dprintk(KERN_INFO "md: ");
NeilBrownb2d444d2005-11-08 21:39:31 -08001467 if (test_bit(Faulty, &rdev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 dprintk("(skipping faulty ");
1469
1470 dprintk("%s ", bdevname(rdev->bdev,b));
NeilBrownb2d444d2005-11-08 21:39:31 -08001471 if (!test_bit(Faulty, &rdev->flags)) {
NeilBrown7bfa19f2005-06-21 17:17:28 -07001472 md_super_write(mddev,rdev,
NeilBrown0002b272005-09-09 16:23:53 -07001473 rdev->sb_offset<<1, rdev->sb_size,
NeilBrown7bfa19f2005-06-21 17:17:28 -07001474 rdev->sb_page);
1475 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1476 bdevname(rdev->bdev,b),
1477 (unsigned long long)rdev->sb_offset);
1478
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479 } else
1480 dprintk(")\n");
NeilBrown7bfa19f2005-06-21 17:17:28 -07001481 if (mddev->level == LEVEL_MULTIPATH)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482 /* only need to write one superblock... */
1483 break;
1484 }
NeilBrowna9701a32005-11-08 21:39:34 -08001485 md_super_wait(mddev);
NeilBrown7bfa19f2005-06-21 17:17:28 -07001486 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1487
NeilBrowna9701a32005-11-08 21:39:34 -08001488 spin_lock_irq(&mddev->write_lock);
NeilBrown7bfa19f2005-06-21 17:17:28 -07001489 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
NeilBrown06d91a52005-06-21 17:17:12 -07001490 /* have to write it out again */
NeilBrowna9701a32005-11-08 21:39:34 -08001491 spin_unlock_irq(&mddev->write_lock);
NeilBrown06d91a52005-06-21 17:17:12 -07001492 goto repeat;
1493 }
1494 mddev->sb_dirty = 0;
NeilBrowna9701a32005-11-08 21:39:34 -08001495 spin_unlock_irq(&mddev->write_lock);
NeilBrown3d310eb2005-06-21 17:17:26 -07001496 wake_up(&mddev->sb_wait);
NeilBrown06d91a52005-06-21 17:17:12 -07001497
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498}
1499
NeilBrown86e6ffd2005-11-08 21:39:24 -08001500struct rdev_sysfs_entry {
1501 struct attribute attr;
1502 ssize_t (*show)(mdk_rdev_t *, char *);
1503 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1504};
1505
1506static ssize_t
NeilBrown96de1e62005-11-08 21:39:39 -08001507state_show(mdk_rdev_t *rdev, char *page)
NeilBrown86e6ffd2005-11-08 21:39:24 -08001508{
1509 char *sep = "";
1510 int len=0;
1511
NeilBrownb2d444d2005-11-08 21:39:31 -08001512 if (test_bit(Faulty, &rdev->flags)) {
NeilBrown86e6ffd2005-11-08 21:39:24 -08001513 len+= sprintf(page+len, "%sfaulty",sep);
1514 sep = ",";
1515 }
NeilBrownb2d444d2005-11-08 21:39:31 -08001516 if (test_bit(In_sync, &rdev->flags)) {
NeilBrown86e6ffd2005-11-08 21:39:24 -08001517 len += sprintf(page+len, "%sin_sync",sep);
1518 sep = ",";
1519 }
NeilBrownb2d444d2005-11-08 21:39:31 -08001520 if (!test_bit(Faulty, &rdev->flags) &&
1521 !test_bit(In_sync, &rdev->flags)) {
NeilBrown86e6ffd2005-11-08 21:39:24 -08001522 len += sprintf(page+len, "%sspare", sep);
1523 sep = ",";
1524 }
1525 return len+sprintf(page+len, "\n");
1526}
1527
NeilBrown96de1e62005-11-08 21:39:39 -08001528static struct rdev_sysfs_entry
1529rdev_state = __ATTR_RO(state);
NeilBrown86e6ffd2005-11-08 21:39:24 -08001530
1531static ssize_t
NeilBrown96de1e62005-11-08 21:39:39 -08001532super_show(mdk_rdev_t *rdev, char *page)
NeilBrown86e6ffd2005-11-08 21:39:24 -08001533{
1534 if (rdev->sb_loaded && rdev->sb_size) {
1535 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1536 return rdev->sb_size;
1537 } else
1538 return 0;
1539}
NeilBrown96de1e62005-11-08 21:39:39 -08001540static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1541
NeilBrown86e6ffd2005-11-08 21:39:24 -08001542static struct attribute *rdev_default_attrs[] = {
1543 &rdev_state.attr,
1544 &rdev_super.attr,
1545 NULL,
1546};
1547static ssize_t
1548rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1549{
1550 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1551 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1552
1553 if (!entry->show)
1554 return -EIO;
1555 return entry->show(rdev, page);
1556}
1557
1558static ssize_t
1559rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1560 const char *page, size_t length)
1561{
1562 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1563 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1564
1565 if (!entry->store)
1566 return -EIO;
1567 return entry->store(rdev, page, length);
1568}
1569
1570static void rdev_free(struct kobject *ko)
1571{
1572 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1573 kfree(rdev);
1574}
1575static struct sysfs_ops rdev_sysfs_ops = {
1576 .show = rdev_attr_show,
1577 .store = rdev_attr_store,
1578};
1579static struct kobj_type rdev_ktype = {
1580 .release = rdev_free,
1581 .sysfs_ops = &rdev_sysfs_ops,
1582 .default_attrs = rdev_default_attrs,
1583};
1584
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585/*
1586 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1587 *
1588 * mark the device faulty if:
1589 *
1590 * - the device is nonexistent (zero size)
1591 * - the device has no valid superblock
1592 *
1593 * a faulty rdev _never_ has rdev->sb set.
1594 */
1595static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1596{
1597 char b[BDEVNAME_SIZE];
1598 int err;
1599 mdk_rdev_t *rdev;
1600 sector_t size;
1601
1602 rdev = (mdk_rdev_t *) kmalloc(sizeof(*rdev), GFP_KERNEL);
1603 if (!rdev) {
1604 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1605 return ERR_PTR(-ENOMEM);
1606 }
1607 memset(rdev, 0, sizeof(*rdev));
1608
1609 if ((err = alloc_disk_sb(rdev)))
1610 goto abort_free;
1611
1612 err = lock_rdev(rdev, newdev);
1613 if (err)
1614 goto abort_free;
1615
NeilBrown86e6ffd2005-11-08 21:39:24 -08001616 rdev->kobj.parent = NULL;
1617 rdev->kobj.ktype = &rdev_ktype;
1618 kobject_init(&rdev->kobj);
1619
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620 rdev->desc_nr = -1;
NeilBrownb2d444d2005-11-08 21:39:31 -08001621 rdev->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622 rdev->data_offset = 0;
1623 atomic_set(&rdev->nr_pending, 0);
NeilBrownba22dcb2005-11-08 21:39:31 -08001624 atomic_set(&rdev->read_errors, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001625
1626 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
1627 if (!size) {
1628 printk(KERN_WARNING
1629 "md: %s has zero or unknown size, marking faulty!\n",
1630 bdevname(rdev->bdev,b));
1631 err = -EINVAL;
1632 goto abort_free;
1633 }
1634
1635 if (super_format >= 0) {
1636 err = super_types[super_format].
1637 load_super(rdev, NULL, super_minor);
1638 if (err == -EINVAL) {
1639 printk(KERN_WARNING
1640 "md: %s has invalid sb, not importing!\n",
1641 bdevname(rdev->bdev,b));
1642 goto abort_free;
1643 }
1644 if (err < 0) {
1645 printk(KERN_WARNING
1646 "md: could not read %s's sb, not importing!\n",
1647 bdevname(rdev->bdev,b));
1648 goto abort_free;
1649 }
1650 }
1651 INIT_LIST_HEAD(&rdev->same_set);
1652
1653 return rdev;
1654
1655abort_free:
1656 if (rdev->sb_page) {
1657 if (rdev->bdev)
1658 unlock_rdev(rdev);
1659 free_disk_sb(rdev);
1660 }
1661 kfree(rdev);
1662 return ERR_PTR(err);
1663}
1664
1665/*
1666 * Check a full RAID array for plausibility
1667 */
1668
1669
NeilBrowna757e642005-04-16 15:26:42 -07001670static void analyze_sbs(mddev_t * mddev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671{
1672 int i;
1673 struct list_head *tmp;
1674 mdk_rdev_t *rdev, *freshest;
1675 char b[BDEVNAME_SIZE];
1676
1677 freshest = NULL;
1678 ITERATE_RDEV(mddev,rdev,tmp)
1679 switch (super_types[mddev->major_version].
1680 load_super(rdev, freshest, mddev->minor_version)) {
1681 case 1:
1682 freshest = rdev;
1683 break;
1684 case 0:
1685 break;
1686 default:
1687 printk( KERN_ERR \
1688 "md: fatal superblock inconsistency in %s"
1689 " -- removing from array\n",
1690 bdevname(rdev->bdev,b));
1691 kick_rdev_from_array(rdev);
1692 }
1693
1694
1695 super_types[mddev->major_version].
1696 validate_super(mddev, freshest);
1697
1698 i = 0;
1699 ITERATE_RDEV(mddev,rdev,tmp) {
1700 if (rdev != freshest)
1701 if (super_types[mddev->major_version].
1702 validate_super(mddev, rdev)) {
1703 printk(KERN_WARNING "md: kicking non-fresh %s"
1704 " from array!\n",
1705 bdevname(rdev->bdev,b));
1706 kick_rdev_from_array(rdev);
1707 continue;
1708 }
1709 if (mddev->level == LEVEL_MULTIPATH) {
1710 rdev->desc_nr = i++;
1711 rdev->raid_disk = rdev->desc_nr;
NeilBrownb2d444d2005-11-08 21:39:31 -08001712 set_bit(In_sync, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713 }
1714 }
1715
1716
1717
1718 if (mddev->recovery_cp != MaxSector &&
1719 mddev->level >= 1)
1720 printk(KERN_ERR "md: %s: raid array is not clean"
1721 " -- starting background reconstruction\n",
1722 mdname(mddev));
1723
Linus Torvalds1da177e2005-04-16 15:20:36 -07001724}
1725
NeilBrowneae17012005-11-08 21:39:23 -08001726static ssize_t
NeilBrown96de1e62005-11-08 21:39:39 -08001727level_show(mddev_t *mddev, char *page)
NeilBrowneae17012005-11-08 21:39:23 -08001728{
1729 mdk_personality_t *p = mddev->pers;
NeilBrownbb636542005-11-08 21:39:45 -08001730 if (p == NULL && mddev->raid_disks == 0)
NeilBrowneae17012005-11-08 21:39:23 -08001731 return 0;
1732 if (mddev->level >= 0)
1733 return sprintf(page, "RAID-%d\n", mddev->level);
1734 else
1735 return sprintf(page, "%s\n", p->name);
1736}
1737
NeilBrown96de1e62005-11-08 21:39:39 -08001738static struct md_sysfs_entry md_level = __ATTR_RO(level);
NeilBrowneae17012005-11-08 21:39:23 -08001739
1740static ssize_t
NeilBrown96de1e62005-11-08 21:39:39 -08001741raid_disks_show(mddev_t *mddev, char *page)
NeilBrowneae17012005-11-08 21:39:23 -08001742{
NeilBrownbb636542005-11-08 21:39:45 -08001743 if (mddev->raid_disks == 0)
1744 return 0;
NeilBrowneae17012005-11-08 21:39:23 -08001745 return sprintf(page, "%d\n", mddev->raid_disks);
1746}
1747
NeilBrown96de1e62005-11-08 21:39:39 -08001748static struct md_sysfs_entry md_raid_disks = __ATTR_RO(raid_disks);
NeilBrowneae17012005-11-08 21:39:23 -08001749
NeilBrown24dd4692005-11-08 21:39:26 -08001750static ssize_t
NeilBrown7eec3142005-11-08 21:39:44 -08001751action_show(mddev_t *mddev, char *page)
NeilBrown24dd4692005-11-08 21:39:26 -08001752{
NeilBrown7eec3142005-11-08 21:39:44 -08001753 char *type = "idle";
NeilBrown31399d92005-11-08 21:39:29 -08001754 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
1755 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
1756 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
NeilBrown24dd4692005-11-08 21:39:26 -08001757 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
1758 type = "resync";
1759 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
1760 type = "check";
1761 else
1762 type = "repair";
1763 } else
1764 type = "recover";
1765 }
1766 return sprintf(page, "%s\n", type);
1767}
1768
1769static ssize_t
NeilBrown7eec3142005-11-08 21:39:44 -08001770action_store(mddev_t *mddev, const char *page, size_t len)
NeilBrown24dd4692005-11-08 21:39:26 -08001771{
NeilBrown7eec3142005-11-08 21:39:44 -08001772 if (!mddev->pers || !mddev->pers->sync_request)
1773 return -EINVAL;
1774
1775 if (strcmp(page, "idle")==0 || strcmp(page, "idle\n")==0) {
1776 if (mddev->sync_thread) {
1777 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1778 md_unregister_thread(mddev->sync_thread);
1779 mddev->sync_thread = NULL;
1780 mddev->recovery = 0;
1781 }
1782 return len;
1783 }
NeilBrown31399d92005-11-08 21:39:29 -08001784
1785 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
1786 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
NeilBrown24dd4692005-11-08 21:39:26 -08001787 return -EBUSY;
NeilBrown7eec3142005-11-08 21:39:44 -08001788 if (strcmp(page, "resync")==0 || strcmp(page, "resync\n")==0 ||
1789 strcmp(page, "recover")==0 || strcmp(page, "recover\n")==0)
1790 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
1791 else {
1792 if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0)
1793 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
1794 else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0)
1795 return -EINVAL;
1796 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
1797 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
1798 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
1799 }
NeilBrown24dd4692005-11-08 21:39:26 -08001800 md_wakeup_thread(mddev->thread);
1801 return len;
1802}
1803
NeilBrown9d888832005-11-08 21:39:26 -08001804static ssize_t
NeilBrown96de1e62005-11-08 21:39:39 -08001805mismatch_cnt_show(mddev_t *mddev, char *page)
NeilBrown9d888832005-11-08 21:39:26 -08001806{
1807 return sprintf(page, "%llu\n",
1808 (unsigned long long) mddev->resync_mismatches);
1809}
1810
NeilBrown96de1e62005-11-08 21:39:39 -08001811static struct md_sysfs_entry
NeilBrown7eec3142005-11-08 21:39:44 -08001812md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
NeilBrown24dd4692005-11-08 21:39:26 -08001813
NeilBrown96de1e62005-11-08 21:39:39 -08001814
1815static struct md_sysfs_entry
1816md_mismatches = __ATTR_RO(mismatch_cnt);
NeilBrown9d888832005-11-08 21:39:26 -08001817
NeilBrowneae17012005-11-08 21:39:23 -08001818static struct attribute *md_default_attrs[] = {
1819 &md_level.attr,
1820 &md_raid_disks.attr,
NeilBrown411036f2005-11-08 21:39:40 -08001821 NULL,
1822};
1823
1824static struct attribute *md_redundancy_attrs[] = {
NeilBrown24dd4692005-11-08 21:39:26 -08001825 &md_scan_mode.attr,
NeilBrown9d888832005-11-08 21:39:26 -08001826 &md_mismatches.attr,
NeilBrowneae17012005-11-08 21:39:23 -08001827 NULL,
1828};
NeilBrown411036f2005-11-08 21:39:40 -08001829static struct attribute_group md_redundancy_group = {
1830 .name = NULL,
1831 .attrs = md_redundancy_attrs,
1832};
1833
NeilBrowneae17012005-11-08 21:39:23 -08001834
1835static ssize_t
1836md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1837{
1838 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
1839 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
NeilBrown96de1e62005-11-08 21:39:39 -08001840 ssize_t rv;
NeilBrowneae17012005-11-08 21:39:23 -08001841
1842 if (!entry->show)
1843 return -EIO;
NeilBrown96de1e62005-11-08 21:39:39 -08001844 mddev_lock(mddev);
1845 rv = entry->show(mddev, page);
1846 mddev_unlock(mddev);
1847 return rv;
NeilBrowneae17012005-11-08 21:39:23 -08001848}
1849
1850static ssize_t
1851md_attr_store(struct kobject *kobj, struct attribute *attr,
1852 const char *page, size_t length)
1853{
1854 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
1855 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
NeilBrown96de1e62005-11-08 21:39:39 -08001856 ssize_t rv;
NeilBrowneae17012005-11-08 21:39:23 -08001857
1858 if (!entry->store)
1859 return -EIO;
NeilBrown96de1e62005-11-08 21:39:39 -08001860 mddev_lock(mddev);
1861 rv = entry->store(mddev, page, length);
1862 mddev_unlock(mddev);
1863 return rv;
NeilBrowneae17012005-11-08 21:39:23 -08001864}
1865
1866static void md_free(struct kobject *ko)
1867{
1868 mddev_t *mddev = container_of(ko, mddev_t, kobj);
1869 kfree(mddev);
1870}
1871
1872static struct sysfs_ops md_sysfs_ops = {
1873 .show = md_attr_show,
1874 .store = md_attr_store,
1875};
1876static struct kobj_type md_ktype = {
1877 .release = md_free,
1878 .sysfs_ops = &md_sysfs_ops,
1879 .default_attrs = md_default_attrs,
1880};
1881
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882int mdp_major = 0;
1883
1884static struct kobject *md_probe(dev_t dev, int *part, void *data)
1885{
1886 static DECLARE_MUTEX(disks_sem);
1887 mddev_t *mddev = mddev_find(dev);
1888 struct gendisk *disk;
1889 int partitioned = (MAJOR(dev) != MD_MAJOR);
1890 int shift = partitioned ? MdpMinorShift : 0;
1891 int unit = MINOR(dev) >> shift;
1892
1893 if (!mddev)
1894 return NULL;
1895
1896 down(&disks_sem);
1897 if (mddev->gendisk) {
1898 up(&disks_sem);
1899 mddev_put(mddev);
1900 return NULL;
1901 }
1902 disk = alloc_disk(1 << shift);
1903 if (!disk) {
1904 up(&disks_sem);
1905 mddev_put(mddev);
1906 return NULL;
1907 }
1908 disk->major = MAJOR(dev);
1909 disk->first_minor = unit << shift;
1910 if (partitioned) {
1911 sprintf(disk->disk_name, "md_d%d", unit);
1912 sprintf(disk->devfs_name, "md/d%d", unit);
1913 } else {
1914 sprintf(disk->disk_name, "md%d", unit);
1915 sprintf(disk->devfs_name, "md/%d", unit);
1916 }
1917 disk->fops = &md_fops;
1918 disk->private_data = mddev;
1919 disk->queue = mddev->queue;
1920 add_disk(disk);
1921 mddev->gendisk = disk;
1922 up(&disks_sem);
NeilBrown9c791972005-11-08 21:39:28 -08001923 mddev->kobj.parent = &disk->kobj;
NeilBrowneae17012005-11-08 21:39:23 -08001924 mddev->kobj.k_name = NULL;
1925 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
1926 mddev->kobj.ktype = &md_ktype;
1927 kobject_register(&mddev->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001928 return NULL;
1929}
1930
1931void md_wakeup_thread(mdk_thread_t *thread);
1932
1933static void md_safemode_timeout(unsigned long data)
1934{
1935 mddev_t *mddev = (mddev_t *) data;
1936
1937 mddev->safemode = 1;
1938 md_wakeup_thread(mddev->thread);
1939}
1940
1941
1942static int do_md_run(mddev_t * mddev)
1943{
1944 int pnum, err;
1945 int chunk_size;
1946 struct list_head *tmp;
1947 mdk_rdev_t *rdev;
1948 struct gendisk *disk;
1949 char b[BDEVNAME_SIZE];
1950
NeilBrowna757e642005-04-16 15:26:42 -07001951 if (list_empty(&mddev->disks))
1952 /* cannot run an array with no devices.. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954
1955 if (mddev->pers)
1956 return -EBUSY;
1957
1958 /*
1959 * Analyze all RAID superblock(s)
1960 */
NeilBrowna757e642005-04-16 15:26:42 -07001961 if (!mddev->raid_disks)
1962 analyze_sbs(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001963
1964 chunk_size = mddev->chunk_size;
1965 pnum = level_to_pers(mddev->level);
1966
1967 if ((pnum != MULTIPATH) && (pnum != RAID1)) {
1968 if (!chunk_size) {
1969 /*
1970 * 'default chunksize' in the old md code used to
1971 * be PAGE_SIZE, baaad.
1972 * we abort here to be on the safe side. We don't
1973 * want to continue the bad practice.
1974 */
1975 printk(KERN_ERR
1976 "no chunksize specified, see 'man raidtab'\n");
1977 return -EINVAL;
1978 }
1979 if (chunk_size > MAX_CHUNK_SIZE) {
1980 printk(KERN_ERR "too big chunk_size: %d > %d\n",
1981 chunk_size, MAX_CHUNK_SIZE);
1982 return -EINVAL;
1983 }
1984 /*
1985 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
1986 */
1987 if ( (1 << ffz(~chunk_size)) != chunk_size) {
NeilBrowna757e642005-04-16 15:26:42 -07001988 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001989 return -EINVAL;
1990 }
1991 if (chunk_size < PAGE_SIZE) {
1992 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
1993 chunk_size, PAGE_SIZE);
1994 return -EINVAL;
1995 }
1996
1997 /* devices must have minimum size of one chunk */
1998 ITERATE_RDEV(mddev,rdev,tmp) {
NeilBrownb2d444d2005-11-08 21:39:31 -08001999 if (test_bit(Faulty, &rdev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000 continue;
2001 if (rdev->size < chunk_size / 1024) {
2002 printk(KERN_WARNING
2003 "md: Dev %s smaller than chunk_size:"
2004 " %lluk < %dk\n",
2005 bdevname(rdev->bdev,b),
2006 (unsigned long long)rdev->size,
2007 chunk_size / 1024);
2008 return -EINVAL;
2009 }
2010 }
2011 }
2012
Linus Torvalds1da177e2005-04-16 15:20:36 -07002013#ifdef CONFIG_KMOD
2014 if (!pers[pnum])
2015 {
2016 request_module("md-personality-%d", pnum);
2017 }
2018#endif
2019
2020 /*
2021 * Drop all container device buffers, from now on
2022 * the only valid external interface is through the md
2023 * device.
2024 * Also find largest hardsector size
2025 */
2026 ITERATE_RDEV(mddev,rdev,tmp) {
NeilBrownb2d444d2005-11-08 21:39:31 -08002027 if (test_bit(Faulty, &rdev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002028 continue;
2029 sync_blockdev(rdev->bdev);
2030 invalidate_bdev(rdev->bdev, 0);
2031 }
2032
2033 md_probe(mddev->unit, NULL, NULL);
2034 disk = mddev->gendisk;
2035 if (!disk)
2036 return -ENOMEM;
2037
2038 spin_lock(&pers_lock);
2039 if (!pers[pnum] || !try_module_get(pers[pnum]->owner)) {
2040 spin_unlock(&pers_lock);
2041 printk(KERN_WARNING "md: personality %d is not loaded!\n",
2042 pnum);
2043 return -EINVAL;
2044 }
2045
2046 mddev->pers = pers[pnum];
2047 spin_unlock(&pers_lock);
2048
NeilBrown657390d2005-08-26 18:34:16 -07002049 mddev->recovery = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002050 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
NeilBrowna9701a32005-11-08 21:39:34 -08002051 mddev->barriers_work = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002052
NeilBrownf91de922005-11-08 21:39:36 -08002053 if (start_readonly)
2054 mddev->ro = 2; /* read-only, but switch on first write */
2055
NeilBrown32a76272005-06-21 17:17:14 -07002056 /* before we start the array running, initialise the bitmap */
2057 err = bitmap_create(mddev);
2058 if (err)
2059 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
2060 mdname(mddev), err);
2061 else
2062 err = mddev->pers->run(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002063 if (err) {
2064 printk(KERN_ERR "md: pers->run() failed ...\n");
2065 module_put(mddev->pers->owner);
2066 mddev->pers = NULL;
NeilBrown32a76272005-06-21 17:17:14 -07002067 bitmap_destroy(mddev);
2068 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002069 }
NeilBrown411036f2005-11-08 21:39:40 -08002070 if (mddev->pers->sync_request)
2071 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
NeilBrownfd9d49c2005-11-08 21:39:42 -08002072 else if (mddev->ro == 2) /* auto-readonly not meaningful */
2073 mddev->ro = 0;
2074
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075 atomic_set(&mddev->writes_pending,0);
2076 mddev->safemode = 0;
2077 mddev->safemode_timer.function = md_safemode_timeout;
2078 mddev->safemode_timer.data = (unsigned long) mddev;
2079 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */
2080 mddev->in_sync = 1;
NeilBrown86e6ffd2005-11-08 21:39:24 -08002081
2082 ITERATE_RDEV(mddev,rdev,tmp)
2083 if (rdev->raid_disk >= 0) {
2084 char nm[20];
2085 sprintf(nm, "rd%d", rdev->raid_disk);
2086 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2087 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088
2089 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
NeilBrown005eca52005-08-22 13:11:08 -07002090 md_wakeup_thread(mddev->thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002091
2092 if (mddev->sb_dirty)
2093 md_update_sb(mddev);
2094
2095 set_capacity(disk, mddev->array_size<<1);
2096
2097 /* If we call blk_queue_make_request here, it will
2098 * re-initialise max_sectors etc which may have been
2099 * refined inside -> run. So just set the bits we need to set.
2100 * Most initialisation happended when we called
2101 * blk_queue_make_request(..., md_fail_request)
2102 * earlier.
2103 */
2104 mddev->queue->queuedata = mddev;
2105 mddev->queue->make_request_fn = mddev->pers->make_request;
2106
2107 mddev->changed = 1;
2108 return 0;
2109}
2110
2111static int restart_array(mddev_t *mddev)
2112{
2113 struct gendisk *disk = mddev->gendisk;
2114 int err;
2115
2116 /*
2117 * Complain if it has no devices
2118 */
2119 err = -ENXIO;
2120 if (list_empty(&mddev->disks))
2121 goto out;
2122
2123 if (mddev->pers) {
2124 err = -EBUSY;
2125 if (!mddev->ro)
2126 goto out;
2127
2128 mddev->safemode = 0;
2129 mddev->ro = 0;
2130 set_disk_ro(disk, 0);
2131
2132 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2133 mdname(mddev));
2134 /*
2135 * Kick recovery or resync if necessary
2136 */
2137 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2138 md_wakeup_thread(mddev->thread);
2139 err = 0;
2140 } else {
2141 printk(KERN_ERR "md: %s has no personality assigned.\n",
2142 mdname(mddev));
2143 err = -EINVAL;
2144 }
2145
2146out:
2147 return err;
2148}
2149
2150static int do_md_stop(mddev_t * mddev, int ro)
2151{
2152 int err = 0;
2153 struct gendisk *disk = mddev->gendisk;
2154
2155 if (mddev->pers) {
2156 if (atomic_read(&mddev->active)>2) {
2157 printk("md: %s still in use.\n",mdname(mddev));
2158 return -EBUSY;
2159 }
2160
2161 if (mddev->sync_thread) {
2162 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2163 md_unregister_thread(mddev->sync_thread);
2164 mddev->sync_thread = NULL;
2165 }
2166
2167 del_timer_sync(&mddev->safemode_timer);
2168
2169 invalidate_partition(disk, 0);
2170
2171 if (ro) {
2172 err = -ENXIO;
NeilBrownf91de922005-11-08 21:39:36 -08002173 if (mddev->ro==1)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002174 goto out;
2175 mddev->ro = 1;
2176 } else {
NeilBrown6b8b3e82005-08-04 12:53:35 -07002177 bitmap_flush(mddev);
NeilBrowna9701a32005-11-08 21:39:34 -08002178 md_super_wait(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002179 if (mddev->ro)
2180 set_disk_ro(disk, 0);
2181 blk_queue_make_request(mddev->queue, md_fail_request);
2182 mddev->pers->stop(mddev);
NeilBrown411036f2005-11-08 21:39:40 -08002183 if (mddev->pers->sync_request)
2184 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
2185
Linus Torvalds1da177e2005-04-16 15:20:36 -07002186 module_put(mddev->pers->owner);
2187 mddev->pers = NULL;
2188 if (mddev->ro)
2189 mddev->ro = 0;
2190 }
2191 if (!mddev->in_sync) {
2192 /* mark array as shutdown cleanly */
2193 mddev->in_sync = 1;
2194 md_update_sb(mddev);
2195 }
2196 if (ro)
2197 set_disk_ro(disk, 1);
2198 }
NeilBrown32a76272005-06-21 17:17:14 -07002199
2200 bitmap_destroy(mddev);
2201 if (mddev->bitmap_file) {
2202 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
2203 fput(mddev->bitmap_file);
2204 mddev->bitmap_file = NULL;
2205 }
NeilBrown92232142005-08-18 11:24:16 -07002206 mddev->bitmap_offset = 0;
NeilBrown32a76272005-06-21 17:17:14 -07002207
Linus Torvalds1da177e2005-04-16 15:20:36 -07002208 /*
2209 * Free resources if final stop
2210 */
2211 if (!ro) {
NeilBrown86e6ffd2005-11-08 21:39:24 -08002212 mdk_rdev_t *rdev;
2213 struct list_head *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002214 struct gendisk *disk;
2215 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
2216
NeilBrown86e6ffd2005-11-08 21:39:24 -08002217 ITERATE_RDEV(mddev,rdev,tmp)
2218 if (rdev->raid_disk >= 0) {
2219 char nm[20];
2220 sprintf(nm, "rd%d", rdev->raid_disk);
2221 sysfs_remove_link(&mddev->kobj, nm);
2222 }
2223
Linus Torvalds1da177e2005-04-16 15:20:36 -07002224 export_array(mddev);
2225
2226 mddev->array_size = 0;
2227 disk = mddev->gendisk;
2228 if (disk)
2229 set_capacity(disk, 0);
2230 mddev->changed = 1;
2231 } else
2232 printk(KERN_INFO "md: %s switched to read-only mode.\n",
2233 mdname(mddev));
2234 err = 0;
2235out:
2236 return err;
2237}
2238
2239static void autorun_array(mddev_t *mddev)
2240{
2241 mdk_rdev_t *rdev;
2242 struct list_head *tmp;
2243 int err;
2244
NeilBrowna757e642005-04-16 15:26:42 -07002245 if (list_empty(&mddev->disks))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002246 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002247
2248 printk(KERN_INFO "md: running: ");
2249
2250 ITERATE_RDEV(mddev,rdev,tmp) {
2251 char b[BDEVNAME_SIZE];
2252 printk("<%s>", bdevname(rdev->bdev,b));
2253 }
2254 printk("\n");
2255
2256 err = do_md_run (mddev);
2257 if (err) {
2258 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
2259 do_md_stop (mddev, 0);
2260 }
2261}
2262
2263/*
2264 * lets try to run arrays based on all disks that have arrived
2265 * until now. (those are in pending_raid_disks)
2266 *
2267 * the method: pick the first pending disk, collect all disks with
2268 * the same UUID, remove all from the pending list and put them into
2269 * the 'same_array' list. Then order this list based on superblock
2270 * update time (freshest comes first), kick out 'old' disks and
2271 * compare superblocks. If everything's fine then run it.
2272 *
2273 * If "unit" is allocated, then bump its reference count
2274 */
2275static void autorun_devices(int part)
2276{
2277 struct list_head candidates;
2278 struct list_head *tmp;
2279 mdk_rdev_t *rdev0, *rdev;
2280 mddev_t *mddev;
2281 char b[BDEVNAME_SIZE];
2282
2283 printk(KERN_INFO "md: autorun ...\n");
2284 while (!list_empty(&pending_raid_disks)) {
2285 dev_t dev;
2286 rdev0 = list_entry(pending_raid_disks.next,
2287 mdk_rdev_t, same_set);
2288
2289 printk(KERN_INFO "md: considering %s ...\n",
2290 bdevname(rdev0->bdev,b));
2291 INIT_LIST_HEAD(&candidates);
2292 ITERATE_RDEV_PENDING(rdev,tmp)
2293 if (super_90_load(rdev, rdev0, 0) >= 0) {
2294 printk(KERN_INFO "md: adding %s ...\n",
2295 bdevname(rdev->bdev,b));
2296 list_move(&rdev->same_set, &candidates);
2297 }
2298 /*
2299 * now we have a set of devices, with all of them having
2300 * mostly sane superblocks. It's time to allocate the
2301 * mddev.
2302 */
2303 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
2304 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
2305 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
2306 break;
2307 }
2308 if (part)
2309 dev = MKDEV(mdp_major,
2310 rdev0->preferred_minor << MdpMinorShift);
2311 else
2312 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
2313
2314 md_probe(dev, NULL, NULL);
2315 mddev = mddev_find(dev);
2316 if (!mddev) {
2317 printk(KERN_ERR
2318 "md: cannot allocate memory for md drive.\n");
2319 break;
2320 }
2321 if (mddev_lock(mddev))
2322 printk(KERN_WARNING "md: %s locked, cannot run\n",
2323 mdname(mddev));
2324 else if (mddev->raid_disks || mddev->major_version
2325 || !list_empty(&mddev->disks)) {
2326 printk(KERN_WARNING
2327 "md: %s already running, cannot run %s\n",
2328 mdname(mddev), bdevname(rdev0->bdev,b));
2329 mddev_unlock(mddev);
2330 } else {
2331 printk(KERN_INFO "md: created %s\n", mdname(mddev));
2332 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
2333 list_del_init(&rdev->same_set);
2334 if (bind_rdev_to_array(rdev, mddev))
2335 export_rdev(rdev);
2336 }
2337 autorun_array(mddev);
2338 mddev_unlock(mddev);
2339 }
2340 /* on success, candidates will be empty, on error
2341 * it won't...
2342 */
2343 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
2344 export_rdev(rdev);
2345 mddev_put(mddev);
2346 }
2347 printk(KERN_INFO "md: ... autorun DONE.\n");
2348}
2349
2350/*
2351 * import RAID devices based on one partition
2352 * if possible, the array gets run as well.
2353 */
2354
2355static int autostart_array(dev_t startdev)
2356{
2357 char b[BDEVNAME_SIZE];
2358 int err = -EINVAL, i;
2359 mdp_super_t *sb = NULL;
2360 mdk_rdev_t *start_rdev = NULL, *rdev;
2361
2362 start_rdev = md_import_device(startdev, 0, 0);
2363 if (IS_ERR(start_rdev))
2364 return err;
2365
2366
2367 /* NOTE: this can only work for 0.90.0 superblocks */
2368 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
2369 if (sb->major_version != 0 ||
2370 sb->minor_version != 90 ) {
2371 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
2372 export_rdev(start_rdev);
2373 return err;
2374 }
2375
NeilBrownb2d444d2005-11-08 21:39:31 -08002376 if (test_bit(Faulty, &start_rdev->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002377 printk(KERN_WARNING
2378 "md: can not autostart based on faulty %s!\n",
2379 bdevname(start_rdev->bdev,b));
2380 export_rdev(start_rdev);
2381 return err;
2382 }
2383 list_add(&start_rdev->same_set, &pending_raid_disks);
2384
2385 for (i = 0; i < MD_SB_DISKS; i++) {
2386 mdp_disk_t *desc = sb->disks + i;
2387 dev_t dev = MKDEV(desc->major, desc->minor);
2388
2389 if (!dev)
2390 continue;
2391 if (dev == startdev)
2392 continue;
2393 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
2394 continue;
2395 rdev = md_import_device(dev, 0, 0);
2396 if (IS_ERR(rdev))
2397 continue;
2398
2399 list_add(&rdev->same_set, &pending_raid_disks);
2400 }
2401
2402 /*
2403 * possibly return codes
2404 */
2405 autorun_devices(0);
2406 return 0;
2407
2408}
2409
2410
2411static int get_version(void __user * arg)
2412{
2413 mdu_version_t ver;
2414
2415 ver.major = MD_MAJOR_VERSION;
2416 ver.minor = MD_MINOR_VERSION;
2417 ver.patchlevel = MD_PATCHLEVEL_VERSION;
2418
2419 if (copy_to_user(arg, &ver, sizeof(ver)))
2420 return -EFAULT;
2421
2422 return 0;
2423}
2424
2425static int get_array_info(mddev_t * mddev, void __user * arg)
2426{
2427 mdu_array_info_t info;
2428 int nr,working,active,failed,spare;
2429 mdk_rdev_t *rdev;
2430 struct list_head *tmp;
2431
2432 nr=working=active=failed=spare=0;
2433 ITERATE_RDEV(mddev,rdev,tmp) {
2434 nr++;
NeilBrownb2d444d2005-11-08 21:39:31 -08002435 if (test_bit(Faulty, &rdev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002436 failed++;
2437 else {
2438 working++;
NeilBrownb2d444d2005-11-08 21:39:31 -08002439 if (test_bit(In_sync, &rdev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002440 active++;
2441 else
2442 spare++;
2443 }
2444 }
2445
2446 info.major_version = mddev->major_version;
2447 info.minor_version = mddev->minor_version;
2448 info.patch_version = MD_PATCHLEVEL_VERSION;
2449 info.ctime = mddev->ctime;
2450 info.level = mddev->level;
2451 info.size = mddev->size;
2452 info.nr_disks = nr;
2453 info.raid_disks = mddev->raid_disks;
2454 info.md_minor = mddev->md_minor;
2455 info.not_persistent= !mddev->persistent;
2456
2457 info.utime = mddev->utime;
2458 info.state = 0;
2459 if (mddev->in_sync)
2460 info.state = (1<<MD_SB_CLEAN);
NeilBrown36fa3062005-09-09 16:23:45 -07002461 if (mddev->bitmap && mddev->bitmap_offset)
2462 info.state = (1<<MD_SB_BITMAP_PRESENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002463 info.active_disks = active;
2464 info.working_disks = working;
2465 info.failed_disks = failed;
2466 info.spare_disks = spare;
2467
2468 info.layout = mddev->layout;
2469 info.chunk_size = mddev->chunk_size;
2470
2471 if (copy_to_user(arg, &info, sizeof(info)))
2472 return -EFAULT;
2473
2474 return 0;
2475}
2476
viro@ZenIV.linux.org.uk87162a22005-09-09 20:36:43 +01002477static int get_bitmap_file(mddev_t * mddev, void __user * arg)
NeilBrown32a76272005-06-21 17:17:14 -07002478{
2479 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
2480 char *ptr, *buf = NULL;
2481 int err = -ENOMEM;
2482
2483 file = kmalloc(sizeof(*file), GFP_KERNEL);
2484 if (!file)
2485 goto out;
2486
2487 /* bitmap disabled, zero the first byte and copy out */
2488 if (!mddev->bitmap || !mddev->bitmap->file) {
2489 file->pathname[0] = '\0';
2490 goto copy_out;
2491 }
2492
2493 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
2494 if (!buf)
2495 goto out;
2496
2497 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
2498 if (!ptr)
2499 goto out;
2500
2501 strcpy(file->pathname, ptr);
2502
2503copy_out:
2504 err = 0;
2505 if (copy_to_user(arg, file, sizeof(*file)))
2506 err = -EFAULT;
2507out:
2508 kfree(buf);
2509 kfree(file);
2510 return err;
2511}
2512
Linus Torvalds1da177e2005-04-16 15:20:36 -07002513static int get_disk_info(mddev_t * mddev, void __user * arg)
2514{
2515 mdu_disk_info_t info;
2516 unsigned int nr;
2517 mdk_rdev_t *rdev;
2518
2519 if (copy_from_user(&info, arg, sizeof(info)))
2520 return -EFAULT;
2521
2522 nr = info.number;
2523
2524 rdev = find_rdev_nr(mddev, nr);
2525 if (rdev) {
2526 info.major = MAJOR(rdev->bdev->bd_dev);
2527 info.minor = MINOR(rdev->bdev->bd_dev);
2528 info.raid_disk = rdev->raid_disk;
2529 info.state = 0;
NeilBrownb2d444d2005-11-08 21:39:31 -08002530 if (test_bit(Faulty, &rdev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002531 info.state |= (1<<MD_DISK_FAULTY);
NeilBrownb2d444d2005-11-08 21:39:31 -08002532 else if (test_bit(In_sync, &rdev->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002533 info.state |= (1<<MD_DISK_ACTIVE);
2534 info.state |= (1<<MD_DISK_SYNC);
2535 }
NeilBrown8ddf9ef2005-09-09 16:23:45 -07002536 if (test_bit(WriteMostly, &rdev->flags))
2537 info.state |= (1<<MD_DISK_WRITEMOSTLY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002538 } else {
2539 info.major = info.minor = 0;
2540 info.raid_disk = -1;
2541 info.state = (1<<MD_DISK_REMOVED);
2542 }
2543
2544 if (copy_to_user(arg, &info, sizeof(info)))
2545 return -EFAULT;
2546
2547 return 0;
2548}
2549
2550static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
2551{
2552 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
2553 mdk_rdev_t *rdev;
2554 dev_t dev = MKDEV(info->major,info->minor);
2555
2556 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
2557 return -EOVERFLOW;
2558
2559 if (!mddev->raid_disks) {
2560 int err;
2561 /* expecting a device which has a superblock */
2562 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
2563 if (IS_ERR(rdev)) {
2564 printk(KERN_WARNING
2565 "md: md_import_device returned %ld\n",
2566 PTR_ERR(rdev));
2567 return PTR_ERR(rdev);
2568 }
2569 if (!list_empty(&mddev->disks)) {
2570 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2571 mdk_rdev_t, same_set);
2572 int err = super_types[mddev->major_version]
2573 .load_super(rdev, rdev0, mddev->minor_version);
2574 if (err < 0) {
2575 printk(KERN_WARNING
2576 "md: %s has different UUID to %s\n",
2577 bdevname(rdev->bdev,b),
2578 bdevname(rdev0->bdev,b2));
2579 export_rdev(rdev);
2580 return -EINVAL;
2581 }
2582 }
2583 err = bind_rdev_to_array(rdev, mddev);
2584 if (err)
2585 export_rdev(rdev);
2586 return err;
2587 }
2588
2589 /*
2590 * add_new_disk can be used once the array is assembled
2591 * to add "hot spares". They must already have a superblock
2592 * written
2593 */
2594 if (mddev->pers) {
2595 int err;
2596 if (!mddev->pers->hot_add_disk) {
2597 printk(KERN_WARNING
2598 "%s: personality does not support diskops!\n",
2599 mdname(mddev));
2600 return -EINVAL;
2601 }
NeilBrown7b1e35f2005-09-09 16:23:50 -07002602 if (mddev->persistent)
2603 rdev = md_import_device(dev, mddev->major_version,
2604 mddev->minor_version);
2605 else
2606 rdev = md_import_device(dev, -1, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002607 if (IS_ERR(rdev)) {
2608 printk(KERN_WARNING
2609 "md: md_import_device returned %ld\n",
2610 PTR_ERR(rdev));
2611 return PTR_ERR(rdev);
2612 }
NeilBrown41158c72005-06-21 17:17:25 -07002613 /* set save_raid_disk if appropriate */
2614 if (!mddev->persistent) {
2615 if (info->state & (1<<MD_DISK_SYNC) &&
2616 info->raid_disk < mddev->raid_disks)
2617 rdev->raid_disk = info->raid_disk;
2618 else
2619 rdev->raid_disk = -1;
2620 } else
2621 super_types[mddev->major_version].
2622 validate_super(mddev, rdev);
2623 rdev->saved_raid_disk = rdev->raid_disk;
2624
NeilBrownb2d444d2005-11-08 21:39:31 -08002625 clear_bit(In_sync, &rdev->flags); /* just to be sure */
NeilBrown8ddf9ef2005-09-09 16:23:45 -07002626 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
2627 set_bit(WriteMostly, &rdev->flags);
2628
Linus Torvalds1da177e2005-04-16 15:20:36 -07002629 rdev->raid_disk = -1;
2630 err = bind_rdev_to_array(rdev, mddev);
2631 if (err)
2632 export_rdev(rdev);
NeilBrownc3617772005-06-21 17:17:10 -07002633
2634 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
NeilBrown005eca52005-08-22 13:11:08 -07002635 md_wakeup_thread(mddev->thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002636 return err;
2637 }
2638
2639 /* otherwise, add_new_disk is only allowed
2640 * for major_version==0 superblocks
2641 */
2642 if (mddev->major_version != 0) {
2643 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
2644 mdname(mddev));
2645 return -EINVAL;
2646 }
2647
2648 if (!(info->state & (1<<MD_DISK_FAULTY))) {
2649 int err;
2650 rdev = md_import_device (dev, -1, 0);
2651 if (IS_ERR(rdev)) {
2652 printk(KERN_WARNING
2653 "md: error, md_import_device() returned %ld\n",
2654 PTR_ERR(rdev));
2655 return PTR_ERR(rdev);
2656 }
2657 rdev->desc_nr = info->number;
2658 if (info->raid_disk < mddev->raid_disks)
2659 rdev->raid_disk = info->raid_disk;
2660 else
2661 rdev->raid_disk = -1;
2662
NeilBrownb2d444d2005-11-08 21:39:31 -08002663 rdev->flags = 0;
2664
Linus Torvalds1da177e2005-04-16 15:20:36 -07002665 if (rdev->raid_disk < mddev->raid_disks)
NeilBrownb2d444d2005-11-08 21:39:31 -08002666 if (info->state & (1<<MD_DISK_SYNC))
2667 set_bit(In_sync, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002668
NeilBrown8ddf9ef2005-09-09 16:23:45 -07002669 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
2670 set_bit(WriteMostly, &rdev->flags);
2671
Linus Torvalds1da177e2005-04-16 15:20:36 -07002672 err = bind_rdev_to_array(rdev, mddev);
2673 if (err) {
2674 export_rdev(rdev);
2675 return err;
2676 }
2677
2678 if (!mddev->persistent) {
2679 printk(KERN_INFO "md: nonpersistent superblock ...\n");
2680 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2681 } else
2682 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
2683 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
2684
2685 if (!mddev->size || (mddev->size > rdev->size))
2686 mddev->size = rdev->size;
2687 }
2688
2689 return 0;
2690}
2691
2692static int hot_remove_disk(mddev_t * mddev, dev_t dev)
2693{
2694 char b[BDEVNAME_SIZE];
2695 mdk_rdev_t *rdev;
2696
2697 if (!mddev->pers)
2698 return -ENODEV;
2699
2700 rdev = find_rdev(mddev, dev);
2701 if (!rdev)
2702 return -ENXIO;
2703
2704 if (rdev->raid_disk >= 0)
2705 goto busy;
2706
2707 kick_rdev_from_array(rdev);
2708 md_update_sb(mddev);
2709
2710 return 0;
2711busy:
2712 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
2713 bdevname(rdev->bdev,b), mdname(mddev));
2714 return -EBUSY;
2715}
2716
2717static int hot_add_disk(mddev_t * mddev, dev_t dev)
2718{
2719 char b[BDEVNAME_SIZE];
2720 int err;
2721 unsigned int size;
2722 mdk_rdev_t *rdev;
2723
2724 if (!mddev->pers)
2725 return -ENODEV;
2726
2727 if (mddev->major_version != 0) {
2728 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
2729 " version-0 superblocks.\n",
2730 mdname(mddev));
2731 return -EINVAL;
2732 }
2733 if (!mddev->pers->hot_add_disk) {
2734 printk(KERN_WARNING
2735 "%s: personality does not support diskops!\n",
2736 mdname(mddev));
2737 return -EINVAL;
2738 }
2739
2740 rdev = md_import_device (dev, -1, 0);
2741 if (IS_ERR(rdev)) {
2742 printk(KERN_WARNING
2743 "md: error, md_import_device() returned %ld\n",
2744 PTR_ERR(rdev));
2745 return -EINVAL;
2746 }
2747
2748 if (mddev->persistent)
2749 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
2750 else
2751 rdev->sb_offset =
2752 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2753
2754 size = calc_dev_size(rdev, mddev->chunk_size);
2755 rdev->size = size;
2756
2757 if (size < mddev->size) {
2758 printk(KERN_WARNING
2759 "%s: disk size %llu blocks < array size %llu\n",
2760 mdname(mddev), (unsigned long long)size,
2761 (unsigned long long)mddev->size);
2762 err = -ENOSPC;
2763 goto abort_export;
2764 }
2765
NeilBrownb2d444d2005-11-08 21:39:31 -08002766 if (test_bit(Faulty, &rdev->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002767 printk(KERN_WARNING
2768 "md: can not hot-add faulty %s disk to %s!\n",
2769 bdevname(rdev->bdev,b), mdname(mddev));
2770 err = -EINVAL;
2771 goto abort_export;
2772 }
NeilBrownb2d444d2005-11-08 21:39:31 -08002773 clear_bit(In_sync, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002774 rdev->desc_nr = -1;
2775 bind_rdev_to_array(rdev, mddev);
2776
2777 /*
2778 * The rest should better be atomic, we can have disk failures
2779 * noticed in interrupt contexts ...
2780 */
2781
2782 if (rdev->desc_nr == mddev->max_disks) {
2783 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
2784 mdname(mddev));
2785 err = -EBUSY;
2786 goto abort_unbind_export;
2787 }
2788
2789 rdev->raid_disk = -1;
2790
2791 md_update_sb(mddev);
2792
2793 /*
2794 * Kick recovery, maybe this spare has to be added to the
2795 * array immediately.
2796 */
2797 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2798 md_wakeup_thread(mddev->thread);
2799
2800 return 0;
2801
2802abort_unbind_export:
2803 unbind_rdev_from_array(rdev);
2804
2805abort_export:
2806 export_rdev(rdev);
2807 return err;
2808}
2809
NeilBrown32a76272005-06-21 17:17:14 -07002810/* similar to deny_write_access, but accounts for our holding a reference
2811 * to the file ourselves */
2812static int deny_bitmap_write_access(struct file * file)
2813{
2814 struct inode *inode = file->f_mapping->host;
2815
2816 spin_lock(&inode->i_lock);
2817 if (atomic_read(&inode->i_writecount) > 1) {
2818 spin_unlock(&inode->i_lock);
2819 return -ETXTBSY;
2820 }
2821 atomic_set(&inode->i_writecount, -1);
2822 spin_unlock(&inode->i_lock);
2823
2824 return 0;
2825}
2826
2827static int set_bitmap_file(mddev_t *mddev, int fd)
2828{
2829 int err;
2830
NeilBrown36fa3062005-09-09 16:23:45 -07002831 if (mddev->pers) {
2832 if (!mddev->pers->quiesce)
2833 return -EBUSY;
2834 if (mddev->recovery || mddev->sync_thread)
2835 return -EBUSY;
2836 /* we should be able to change the bitmap.. */
NeilBrown32a76272005-06-21 17:17:14 -07002837 }
2838
NeilBrown36fa3062005-09-09 16:23:45 -07002839
2840 if (fd >= 0) {
2841 if (mddev->bitmap)
2842 return -EEXIST; /* cannot add when bitmap is present */
2843 mddev->bitmap_file = fget(fd);
2844
2845 if (mddev->bitmap_file == NULL) {
2846 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
2847 mdname(mddev));
2848 return -EBADF;
2849 }
2850
2851 err = deny_bitmap_write_access(mddev->bitmap_file);
2852 if (err) {
2853 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
2854 mdname(mddev));
2855 fput(mddev->bitmap_file);
2856 mddev->bitmap_file = NULL;
2857 return err;
2858 }
NeilBrowna654b9d82005-06-21 17:17:27 -07002859 mddev->bitmap_offset = 0; /* file overrides offset */
NeilBrown36fa3062005-09-09 16:23:45 -07002860 } else if (mddev->bitmap == NULL)
2861 return -ENOENT; /* cannot remove what isn't there */
2862 err = 0;
2863 if (mddev->pers) {
2864 mddev->pers->quiesce(mddev, 1);
2865 if (fd >= 0)
2866 err = bitmap_create(mddev);
2867 if (fd < 0 || err)
2868 bitmap_destroy(mddev);
2869 mddev->pers->quiesce(mddev, 0);
2870 } else if (fd < 0) {
2871 if (mddev->bitmap_file)
2872 fput(mddev->bitmap_file);
2873 mddev->bitmap_file = NULL;
2874 }
2875
NeilBrown32a76272005-06-21 17:17:14 -07002876 return err;
2877}
2878
Linus Torvalds1da177e2005-04-16 15:20:36 -07002879/*
2880 * set_array_info is used two different ways
2881 * The original usage is when creating a new array.
2882 * In this usage, raid_disks is > 0 and it together with
2883 * level, size, not_persistent,layout,chunksize determine the
2884 * shape of the array.
2885 * This will always create an array with a type-0.90.0 superblock.
2886 * The newer usage is when assembling an array.
2887 * In this case raid_disks will be 0, and the major_version field is
2888 * use to determine which style super-blocks are to be found on the devices.
2889 * The minor and patch _version numbers are also kept incase the
2890 * super_block handler wishes to interpret them.
2891 */
2892static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
2893{
2894
2895 if (info->raid_disks == 0) {
2896 /* just setting version number for superblock loading */
2897 if (info->major_version < 0 ||
2898 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
2899 super_types[info->major_version].name == NULL) {
2900 /* maybe try to auto-load a module? */
2901 printk(KERN_INFO
2902 "md: superblock version %d not known\n",
2903 info->major_version);
2904 return -EINVAL;
2905 }
2906 mddev->major_version = info->major_version;
2907 mddev->minor_version = info->minor_version;
2908 mddev->patch_version = info->patch_version;
2909 return 0;
2910 }
2911 mddev->major_version = MD_MAJOR_VERSION;
2912 mddev->minor_version = MD_MINOR_VERSION;
2913 mddev->patch_version = MD_PATCHLEVEL_VERSION;
2914 mddev->ctime = get_seconds();
2915
2916 mddev->level = info->level;
2917 mddev->size = info->size;
2918 mddev->raid_disks = info->raid_disks;
2919 /* don't set md_minor, it is determined by which /dev/md* was
2920 * openned
2921 */
2922 if (info->state & (1<<MD_SB_CLEAN))
2923 mddev->recovery_cp = MaxSector;
2924 else
2925 mddev->recovery_cp = 0;
2926 mddev->persistent = ! info->not_persistent;
2927
2928 mddev->layout = info->layout;
2929 mddev->chunk_size = info->chunk_size;
2930
2931 mddev->max_disks = MD_SB_DISKS;
2932
2933 mddev->sb_dirty = 1;
2934
2935 /*
2936 * Generate a 128 bit UUID
2937 */
2938 get_random_bytes(mddev->uuid, 16);
2939
2940 return 0;
2941}
2942
2943/*
2944 * update_array_info is used to change the configuration of an
2945 * on-line array.
2946 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
2947 * fields in the info are checked against the array.
2948 * Any differences that cannot be handled will cause an error.
2949 * Normally, only one change can be managed at a time.
2950 */
2951static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
2952{
2953 int rv = 0;
2954 int cnt = 0;
NeilBrown36fa3062005-09-09 16:23:45 -07002955 int state = 0;
2956
2957 /* calculate expected state,ignoring low bits */
2958 if (mddev->bitmap && mddev->bitmap_offset)
2959 state |= (1 << MD_SB_BITMAP_PRESENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002960
2961 if (mddev->major_version != info->major_version ||
2962 mddev->minor_version != info->minor_version ||
2963/* mddev->patch_version != info->patch_version || */
2964 mddev->ctime != info->ctime ||
2965 mddev->level != info->level ||
2966/* mddev->layout != info->layout || */
2967 !mddev->persistent != info->not_persistent||
NeilBrown36fa3062005-09-09 16:23:45 -07002968 mddev->chunk_size != info->chunk_size ||
2969 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
2970 ((state^info->state) & 0xfffffe00)
2971 )
Linus Torvalds1da177e2005-04-16 15:20:36 -07002972 return -EINVAL;
2973 /* Check there is only one change */
2974 if (mddev->size != info->size) cnt++;
2975 if (mddev->raid_disks != info->raid_disks) cnt++;
2976 if (mddev->layout != info->layout) cnt++;
NeilBrown36fa3062005-09-09 16:23:45 -07002977 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002978 if (cnt == 0) return 0;
2979 if (cnt > 1) return -EINVAL;
2980
2981 if (mddev->layout != info->layout) {
2982 /* Change layout
2983 * we don't need to do anything at the md level, the
2984 * personality will take care of it all.
2985 */
2986 if (mddev->pers->reconfig == NULL)
2987 return -EINVAL;
2988 else
2989 return mddev->pers->reconfig(mddev, info->layout, -1);
2990 }
2991 if (mddev->size != info->size) {
2992 mdk_rdev_t * rdev;
2993 struct list_head *tmp;
2994 if (mddev->pers->resize == NULL)
2995 return -EINVAL;
2996 /* The "size" is the amount of each device that is used.
2997 * This can only make sense for arrays with redundancy.
2998 * linear and raid0 always use whatever space is available
2999 * We can only consider changing the size if no resync
3000 * or reconstruction is happening, and if the new size
3001 * is acceptable. It must fit before the sb_offset or,
3002 * if that is <data_offset, it must fit before the
3003 * size of each device.
3004 * If size is zero, we find the largest size that fits.
3005 */
3006 if (mddev->sync_thread)
3007 return -EBUSY;
3008 ITERATE_RDEV(mddev,rdev,tmp) {
3009 sector_t avail;
3010 int fit = (info->size == 0);
3011 if (rdev->sb_offset > rdev->data_offset)
3012 avail = (rdev->sb_offset*2) - rdev->data_offset;
3013 else
3014 avail = get_capacity(rdev->bdev->bd_disk)
3015 - rdev->data_offset;
3016 if (fit && (info->size == 0 || info->size > avail/2))
3017 info->size = avail/2;
3018 if (avail < ((sector_t)info->size << 1))
3019 return -ENOSPC;
3020 }
3021 rv = mddev->pers->resize(mddev, (sector_t)info->size *2);
3022 if (!rv) {
3023 struct block_device *bdev;
3024
3025 bdev = bdget_disk(mddev->gendisk, 0);
3026 if (bdev) {
3027 down(&bdev->bd_inode->i_sem);
3028 i_size_write(bdev->bd_inode, mddev->array_size << 10);
3029 up(&bdev->bd_inode->i_sem);
3030 bdput(bdev);
3031 }
3032 }
3033 }
3034 if (mddev->raid_disks != info->raid_disks) {
3035 /* change the number of raid disks */
3036 if (mddev->pers->reshape == NULL)
3037 return -EINVAL;
3038 if (info->raid_disks <= 0 ||
3039 info->raid_disks >= mddev->max_disks)
3040 return -EINVAL;
3041 if (mddev->sync_thread)
3042 return -EBUSY;
3043 rv = mddev->pers->reshape(mddev, info->raid_disks);
3044 if (!rv) {
3045 struct block_device *bdev;
3046
3047 bdev = bdget_disk(mddev->gendisk, 0);
3048 if (bdev) {
3049 down(&bdev->bd_inode->i_sem);
3050 i_size_write(bdev->bd_inode, mddev->array_size << 10);
3051 up(&bdev->bd_inode->i_sem);
3052 bdput(bdev);
3053 }
3054 }
3055 }
NeilBrown36fa3062005-09-09 16:23:45 -07003056 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
3057 if (mddev->pers->quiesce == NULL)
3058 return -EINVAL;
3059 if (mddev->recovery || mddev->sync_thread)
3060 return -EBUSY;
3061 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
3062 /* add the bitmap */
3063 if (mddev->bitmap)
3064 return -EEXIST;
3065 if (mddev->default_bitmap_offset == 0)
3066 return -EINVAL;
3067 mddev->bitmap_offset = mddev->default_bitmap_offset;
3068 mddev->pers->quiesce(mddev, 1);
3069 rv = bitmap_create(mddev);
3070 if (rv)
3071 bitmap_destroy(mddev);
3072 mddev->pers->quiesce(mddev, 0);
3073 } else {
3074 /* remove the bitmap */
3075 if (!mddev->bitmap)
3076 return -ENOENT;
3077 if (mddev->bitmap->file)
3078 return -EINVAL;
3079 mddev->pers->quiesce(mddev, 1);
3080 bitmap_destroy(mddev);
3081 mddev->pers->quiesce(mddev, 0);
3082 mddev->bitmap_offset = 0;
3083 }
3084 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003085 md_update_sb(mddev);
3086 return rv;
3087}
3088
3089static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3090{
3091 mdk_rdev_t *rdev;
3092
3093 if (mddev->pers == NULL)
3094 return -ENODEV;
3095
3096 rdev = find_rdev(mddev, dev);
3097 if (!rdev)
3098 return -ENODEV;
3099
3100 md_error(mddev, rdev);
3101 return 0;
3102}
3103
3104static int md_ioctl(struct inode *inode, struct file *file,
3105 unsigned int cmd, unsigned long arg)
3106{
3107 int err = 0;
3108 void __user *argp = (void __user *)arg;
3109 struct hd_geometry __user *loc = argp;
3110 mddev_t *mddev = NULL;
3111
3112 if (!capable(CAP_SYS_ADMIN))
3113 return -EACCES;
3114
3115 /*
3116 * Commands dealing with the RAID driver but not any
3117 * particular array:
3118 */
3119 switch (cmd)
3120 {
3121 case RAID_VERSION:
3122 err = get_version(argp);
3123 goto done;
3124
3125 case PRINT_RAID_DEBUG:
3126 err = 0;
3127 md_print_devices();
3128 goto done;
3129
3130#ifndef MODULE
3131 case RAID_AUTORUN:
3132 err = 0;
3133 autostart_arrays(arg);
3134 goto done;
3135#endif
3136 default:;
3137 }
3138
3139 /*
3140 * Commands creating/starting a new array:
3141 */
3142
3143 mddev = inode->i_bdev->bd_disk->private_data;
3144
3145 if (!mddev) {
3146 BUG();
3147 goto abort;
3148 }
3149
3150
3151 if (cmd == START_ARRAY) {
3152 /* START_ARRAY doesn't need to lock the array as autostart_array
3153 * does the locking, and it could even be a different array
3154 */
3155 static int cnt = 3;
3156 if (cnt > 0 ) {
3157 printk(KERN_WARNING
3158 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
3159 "This will not be supported beyond 2.6\n",
3160 current->comm, current->pid);
3161 cnt--;
3162 }
3163 err = autostart_array(new_decode_dev(arg));
3164 if (err) {
3165 printk(KERN_WARNING "md: autostart failed!\n");
3166 goto abort;
3167 }
3168 goto done;
3169 }
3170
3171 err = mddev_lock(mddev);
3172 if (err) {
3173 printk(KERN_INFO
3174 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3175 err, cmd);
3176 goto abort;
3177 }
3178
3179 switch (cmd)
3180 {
3181 case SET_ARRAY_INFO:
3182 {
3183 mdu_array_info_t info;
3184 if (!arg)
3185 memset(&info, 0, sizeof(info));
3186 else if (copy_from_user(&info, argp, sizeof(info))) {
3187 err = -EFAULT;
3188 goto abort_unlock;
3189 }
3190 if (mddev->pers) {
3191 err = update_array_info(mddev, &info);
3192 if (err) {
3193 printk(KERN_WARNING "md: couldn't update"
3194 " array info. %d\n", err);
3195 goto abort_unlock;
3196 }
3197 goto done_unlock;
3198 }
3199 if (!list_empty(&mddev->disks)) {
3200 printk(KERN_WARNING
3201 "md: array %s already has disks!\n",
3202 mdname(mddev));
3203 err = -EBUSY;
3204 goto abort_unlock;
3205 }
3206 if (mddev->raid_disks) {
3207 printk(KERN_WARNING
3208 "md: array %s already initialised!\n",
3209 mdname(mddev));
3210 err = -EBUSY;
3211 goto abort_unlock;
3212 }
3213 err = set_array_info(mddev, &info);
3214 if (err) {
3215 printk(KERN_WARNING "md: couldn't set"
3216 " array info. %d\n", err);
3217 goto abort_unlock;
3218 }
3219 }
3220 goto done_unlock;
3221
3222 default:;
3223 }
3224
3225 /*
3226 * Commands querying/configuring an existing array:
3227 */
NeilBrown32a76272005-06-21 17:17:14 -07003228 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3229 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3230 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3231 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003232 err = -ENODEV;
3233 goto abort_unlock;
3234 }
3235
3236 /*
3237 * Commands even a read-only array can execute:
3238 */
3239 switch (cmd)
3240 {
3241 case GET_ARRAY_INFO:
3242 err = get_array_info(mddev, argp);
3243 goto done_unlock;
3244
NeilBrown32a76272005-06-21 17:17:14 -07003245 case GET_BITMAP_FILE:
viro@ZenIV.linux.org.uk87162a22005-09-09 20:36:43 +01003246 err = get_bitmap_file(mddev, argp);
NeilBrown32a76272005-06-21 17:17:14 -07003247 goto done_unlock;
3248
Linus Torvalds1da177e2005-04-16 15:20:36 -07003249 case GET_DISK_INFO:
3250 err = get_disk_info(mddev, argp);
3251 goto done_unlock;
3252
3253 case RESTART_ARRAY_RW:
3254 err = restart_array(mddev);
3255 goto done_unlock;
3256
3257 case STOP_ARRAY:
3258 err = do_md_stop (mddev, 0);
3259 goto done_unlock;
3260
3261 case STOP_ARRAY_RO:
3262 err = do_md_stop (mddev, 1);
3263 goto done_unlock;
3264
3265 /*
3266 * We have a problem here : there is no easy way to give a CHS
3267 * virtual geometry. We currently pretend that we have a 2 heads
3268 * 4 sectors (with a BIG number of cylinders...). This drives
3269 * dosfs just mad... ;-)
3270 */
3271 case HDIO_GETGEO:
3272 if (!loc) {
3273 err = -EINVAL;
3274 goto abort_unlock;
3275 }
3276 err = put_user (2, (char __user *) &loc->heads);
3277 if (err)
3278 goto abort_unlock;
3279 err = put_user (4, (char __user *) &loc->sectors);
3280 if (err)
3281 goto abort_unlock;
3282 err = put_user(get_capacity(mddev->gendisk)/8,
3283 (short __user *) &loc->cylinders);
3284 if (err)
3285 goto abort_unlock;
3286 err = put_user (get_start_sect(inode->i_bdev),
3287 (long __user *) &loc->start);
3288 goto done_unlock;
3289 }
3290
3291 /*
3292 * The remaining ioctls are changing the state of the
NeilBrownf91de922005-11-08 21:39:36 -08003293 * superblock, so we do not allow them on read-only arrays.
3294 * However non-MD ioctls (e.g. get-size) will still come through
3295 * here and hit the 'default' below, so only disallow
3296 * 'md' ioctls, and switch to rw mode if started auto-readonly.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003297 */
NeilBrownf91de922005-11-08 21:39:36 -08003298 if (_IOC_TYPE(cmd) == MD_MAJOR &&
3299 mddev->ro && mddev->pers) {
3300 if (mddev->ro == 2) {
3301 mddev->ro = 0;
3302 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3303 md_wakeup_thread(mddev->thread);
3304
3305 } else {
3306 err = -EROFS;
3307 goto abort_unlock;
3308 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003309 }
3310
3311 switch (cmd)
3312 {
3313 case ADD_NEW_DISK:
3314 {
3315 mdu_disk_info_t info;
3316 if (copy_from_user(&info, argp, sizeof(info)))
3317 err = -EFAULT;
3318 else
3319 err = add_new_disk(mddev, &info);
3320 goto done_unlock;
3321 }
3322
3323 case HOT_REMOVE_DISK:
3324 err = hot_remove_disk(mddev, new_decode_dev(arg));
3325 goto done_unlock;
3326
3327 case HOT_ADD_DISK:
3328 err = hot_add_disk(mddev, new_decode_dev(arg));
3329 goto done_unlock;
3330
3331 case SET_DISK_FAULTY:
3332 err = set_disk_faulty(mddev, new_decode_dev(arg));
3333 goto done_unlock;
3334
3335 case RUN_ARRAY:
3336 err = do_md_run (mddev);
3337 goto done_unlock;
3338
NeilBrown32a76272005-06-21 17:17:14 -07003339 case SET_BITMAP_FILE:
3340 err = set_bitmap_file(mddev, (int)arg);
3341 goto done_unlock;
3342
Linus Torvalds1da177e2005-04-16 15:20:36 -07003343 default:
3344 if (_IOC_TYPE(cmd) == MD_MAJOR)
3345 printk(KERN_WARNING "md: %s(pid %d) used"
3346 " obsolete MD ioctl, upgrade your"
3347 " software to use new ictls.\n",
3348 current->comm, current->pid);
3349 err = -EINVAL;
3350 goto abort_unlock;
3351 }
3352
3353done_unlock:
3354abort_unlock:
3355 mddev_unlock(mddev);
3356
3357 return err;
3358done:
3359 if (err)
3360 MD_BUG();
3361abort:
3362 return err;
3363}
3364
3365static int md_open(struct inode *inode, struct file *file)
3366{
3367 /*
3368 * Succeed if we can lock the mddev, which confirms that
3369 * it isn't being stopped right now.
3370 */
3371 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3372 int err;
3373
3374 if ((err = mddev_lock(mddev)))
3375 goto out;
3376
3377 err = 0;
3378 mddev_get(mddev);
3379 mddev_unlock(mddev);
3380
3381 check_disk_change(inode->i_bdev);
3382 out:
3383 return err;
3384}
3385
3386static int md_release(struct inode *inode, struct file * file)
3387{
3388 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3389
3390 if (!mddev)
3391 BUG();
3392 mddev_put(mddev);
3393
3394 return 0;
3395}
3396
3397static int md_media_changed(struct gendisk *disk)
3398{
3399 mddev_t *mddev = disk->private_data;
3400
3401 return mddev->changed;
3402}
3403
3404static int md_revalidate(struct gendisk *disk)
3405{
3406 mddev_t *mddev = disk->private_data;
3407
3408 mddev->changed = 0;
3409 return 0;
3410}
3411static struct block_device_operations md_fops =
3412{
3413 .owner = THIS_MODULE,
3414 .open = md_open,
3415 .release = md_release,
3416 .ioctl = md_ioctl,
3417 .media_changed = md_media_changed,
3418 .revalidate_disk= md_revalidate,
3419};
3420
Adrian Bunk75c96f82005-05-05 16:16:09 -07003421static int md_thread(void * arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003422{
3423 mdk_thread_t *thread = arg;
3424
Linus Torvalds1da177e2005-04-16 15:20:36 -07003425 /*
3426 * md_thread is a 'system-thread', it's priority should be very
3427 * high. We avoid resource deadlocks individually in each
3428 * raid personality. (RAID5 does preallocation) We also use RR and
3429 * the very same RT priority as kswapd, thus we will never get
3430 * into a priority inversion deadlock.
3431 *
3432 * we definitely have to have equal or higher priority than
3433 * bdflush, otherwise bdflush will deadlock if there are too
3434 * many dirty RAID5 blocks.
3435 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003436
NeilBrown6985c432005-10-19 21:23:47 -07003437 allow_signal(SIGKILL);
NeilBrowna6fb0932005-09-09 16:23:56 -07003438 while (!kthread_should_stop()) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003439
NeilBrown787453c2005-11-08 21:39:43 -08003440 wait_event_timeout(thread->wqueue,
3441 test_bit(THREAD_WAKEUP, &thread->flags)
3442 || kthread_should_stop(),
3443 thread->timeout);
Christoph Lameter3e1d1d22005-06-24 23:13:50 -07003444 try_to_freeze();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003445
3446 clear_bit(THREAD_WAKEUP, &thread->flags);
3447
NeilBrown787453c2005-11-08 21:39:43 -08003448 thread->run(thread->mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003449 }
NeilBrowna6fb0932005-09-09 16:23:56 -07003450
Linus Torvalds1da177e2005-04-16 15:20:36 -07003451 return 0;
3452}
3453
3454void md_wakeup_thread(mdk_thread_t *thread)
3455{
3456 if (thread) {
3457 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
3458 set_bit(THREAD_WAKEUP, &thread->flags);
3459 wake_up(&thread->wqueue);
3460 }
3461}
3462
3463mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
3464 const char *name)
3465{
3466 mdk_thread_t *thread;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003467
NeilBrowna6fb0932005-09-09 16:23:56 -07003468 thread = kmalloc(sizeof(mdk_thread_t), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003469 if (!thread)
3470 return NULL;
3471
3472 memset(thread, 0, sizeof(mdk_thread_t));
3473 init_waitqueue_head(&thread->wqueue);
3474
Linus Torvalds1da177e2005-04-16 15:20:36 -07003475 thread->run = run;
3476 thread->mddev = mddev;
NeilBrown32a76272005-06-21 17:17:14 -07003477 thread->timeout = MAX_SCHEDULE_TIMEOUT;
NeilBrown6985c432005-10-19 21:23:47 -07003478 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
NeilBrowna6fb0932005-09-09 16:23:56 -07003479 if (IS_ERR(thread->tsk)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003480 kfree(thread);
3481 return NULL;
3482 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003483 return thread;
3484}
3485
Linus Torvalds1da177e2005-04-16 15:20:36 -07003486void md_unregister_thread(mdk_thread_t *thread)
3487{
NeilBrownd28446f2005-04-16 15:26:41 -07003488 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
NeilBrowna6fb0932005-09-09 16:23:56 -07003489
3490 kthread_stop(thread->tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003491 kfree(thread);
3492}
3493
3494void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
3495{
3496 if (!mddev) {
3497 MD_BUG();
3498 return;
3499 }
3500
NeilBrownb2d444d2005-11-08 21:39:31 -08003501 if (!rdev || test_bit(Faulty, &rdev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003502 return;
NeilBrown32a76272005-06-21 17:17:14 -07003503/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07003504 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
3505 mdname(mddev),
3506 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
3507 __builtin_return_address(0),__builtin_return_address(1),
3508 __builtin_return_address(2),__builtin_return_address(3));
NeilBrown32a76272005-06-21 17:17:14 -07003509*/
Linus Torvalds1da177e2005-04-16 15:20:36 -07003510 if (!mddev->pers->error_handler)
3511 return;
3512 mddev->pers->error_handler(mddev,rdev);
3513 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3514 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3515 md_wakeup_thread(mddev->thread);
3516}
3517
3518/* seq_file implementation /proc/mdstat */
3519
3520static void status_unused(struct seq_file *seq)
3521{
3522 int i = 0;
3523 mdk_rdev_t *rdev;
3524 struct list_head *tmp;
3525
3526 seq_printf(seq, "unused devices: ");
3527
3528 ITERATE_RDEV_PENDING(rdev,tmp) {
3529 char b[BDEVNAME_SIZE];
3530 i++;
3531 seq_printf(seq, "%s ",
3532 bdevname(rdev->bdev,b));
3533 }
3534 if (!i)
3535 seq_printf(seq, "<none>");
3536
3537 seq_printf(seq, "\n");
3538}
3539
3540
3541static void status_resync(struct seq_file *seq, mddev_t * mddev)
3542{
3543 unsigned long max_blocks, resync, res, dt, db, rt;
3544
3545 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
3546
3547 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3548 max_blocks = mddev->resync_max_sectors >> 1;
3549 else
3550 max_blocks = mddev->size;
3551
3552 /*
3553 * Should not happen.
3554 */
3555 if (!max_blocks) {
3556 MD_BUG();
3557 return;
3558 }
3559 res = (resync/1024)*1000/(max_blocks/1024 + 1);
3560 {
3561 int i, x = res/50, y = 20-x;
3562 seq_printf(seq, "[");
3563 for (i = 0; i < x; i++)
3564 seq_printf(seq, "=");
3565 seq_printf(seq, ">");
3566 for (i = 0; i < y; i++)
3567 seq_printf(seq, ".");
3568 seq_printf(seq, "] ");
3569 }
3570 seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)",
3571 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
3572 "resync" : "recovery"),
3573 res/10, res % 10, resync, max_blocks);
3574
3575 /*
3576 * We do not want to overflow, so the order of operands and
3577 * the * 100 / 100 trick are important. We do a +1 to be
3578 * safe against division by zero. We only estimate anyway.
3579 *
3580 * dt: time from mark until now
3581 * db: blocks written from mark until now
3582 * rt: remaining time
3583 */
3584 dt = ((jiffies - mddev->resync_mark) / HZ);
3585 if (!dt) dt++;
3586 db = resync - (mddev->resync_mark_cnt/2);
3587 rt = (dt * ((max_blocks-resync) / (db/100+1)))/100;
3588
3589 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
3590
3591 seq_printf(seq, " speed=%ldK/sec", db/dt);
3592}
3593
3594static void *md_seq_start(struct seq_file *seq, loff_t *pos)
3595{
3596 struct list_head *tmp;
3597 loff_t l = *pos;
3598 mddev_t *mddev;
3599
3600 if (l >= 0x10000)
3601 return NULL;
3602 if (!l--)
3603 /* header */
3604 return (void*)1;
3605
3606 spin_lock(&all_mddevs_lock);
3607 list_for_each(tmp,&all_mddevs)
3608 if (!l--) {
3609 mddev = list_entry(tmp, mddev_t, all_mddevs);
3610 mddev_get(mddev);
3611 spin_unlock(&all_mddevs_lock);
3612 return mddev;
3613 }
3614 spin_unlock(&all_mddevs_lock);
3615 if (!l--)
3616 return (void*)2;/* tail */
3617 return NULL;
3618}
3619
3620static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3621{
3622 struct list_head *tmp;
3623 mddev_t *next_mddev, *mddev = v;
3624
3625 ++*pos;
3626 if (v == (void*)2)
3627 return NULL;
3628
3629 spin_lock(&all_mddevs_lock);
3630 if (v == (void*)1)
3631 tmp = all_mddevs.next;
3632 else
3633 tmp = mddev->all_mddevs.next;
3634 if (tmp != &all_mddevs)
3635 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
3636 else {
3637 next_mddev = (void*)2;
3638 *pos = 0x10000;
3639 }
3640 spin_unlock(&all_mddevs_lock);
3641
3642 if (v != (void*)1)
3643 mddev_put(mddev);
3644 return next_mddev;
3645
3646}
3647
3648static void md_seq_stop(struct seq_file *seq, void *v)
3649{
3650 mddev_t *mddev = v;
3651
3652 if (mddev && v != (void*)1 && v != (void*)2)
3653 mddev_put(mddev);
3654}
3655
3656static int md_seq_show(struct seq_file *seq, void *v)
3657{
3658 mddev_t *mddev = v;
3659 sector_t size;
3660 struct list_head *tmp2;
3661 mdk_rdev_t *rdev;
3662 int i;
NeilBrown32a76272005-06-21 17:17:14 -07003663 struct bitmap *bitmap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003664
3665 if (v == (void*)1) {
3666 seq_printf(seq, "Personalities : ");
3667 spin_lock(&pers_lock);
3668 for (i = 0; i < MAX_PERSONALITY; i++)
3669 if (pers[i])
3670 seq_printf(seq, "[%s] ", pers[i]->name);
3671
3672 spin_unlock(&pers_lock);
3673 seq_printf(seq, "\n");
3674 return 0;
3675 }
3676 if (v == (void*)2) {
3677 status_unused(seq);
3678 return 0;
3679 }
3680
3681 if (mddev_lock(mddev)!=0)
3682 return -EINTR;
3683 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
3684 seq_printf(seq, "%s : %sactive", mdname(mddev),
3685 mddev->pers ? "" : "in");
3686 if (mddev->pers) {
NeilBrownf91de922005-11-08 21:39:36 -08003687 if (mddev->ro==1)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003688 seq_printf(seq, " (read-only)");
NeilBrownf91de922005-11-08 21:39:36 -08003689 if (mddev->ro==2)
3690 seq_printf(seq, "(auto-read-only)");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003691 seq_printf(seq, " %s", mddev->pers->name);
3692 }
3693
3694 size = 0;
3695 ITERATE_RDEV(mddev,rdev,tmp2) {
3696 char b[BDEVNAME_SIZE];
3697 seq_printf(seq, " %s[%d]",
3698 bdevname(rdev->bdev,b), rdev->desc_nr);
NeilBrown8ddf9ef2005-09-09 16:23:45 -07003699 if (test_bit(WriteMostly, &rdev->flags))
3700 seq_printf(seq, "(W)");
NeilBrownb2d444d2005-11-08 21:39:31 -08003701 if (test_bit(Faulty, &rdev->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003702 seq_printf(seq, "(F)");
3703 continue;
NeilBrownb325a322005-09-09 16:24:00 -07003704 } else if (rdev->raid_disk < 0)
3705 seq_printf(seq, "(S)"); /* spare */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003706 size += rdev->size;
3707 }
3708
3709 if (!list_empty(&mddev->disks)) {
3710 if (mddev->pers)
3711 seq_printf(seq, "\n %llu blocks",
3712 (unsigned long long)mddev->array_size);
3713 else
3714 seq_printf(seq, "\n %llu blocks",
3715 (unsigned long long)size);
3716 }
NeilBrown1cd6bf12005-09-09 16:24:00 -07003717 if (mddev->persistent) {
3718 if (mddev->major_version != 0 ||
3719 mddev->minor_version != 90) {
3720 seq_printf(seq," super %d.%d",
3721 mddev->major_version,
3722 mddev->minor_version);
3723 }
3724 } else
3725 seq_printf(seq, " super non-persistent");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003726
3727 if (mddev->pers) {
3728 mddev->pers->status (seq, mddev);
3729 seq_printf(seq, "\n ");
NeilBrown8e1b39d2005-11-08 21:39:41 -08003730 if (mddev->pers->sync_request) {
3731 if (mddev->curr_resync > 2) {
3732 status_resync (seq, mddev);
3733 seq_printf(seq, "\n ");
3734 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
3735 seq_printf(seq, "\tresync=DELAYED\n ");
3736 else if (mddev->recovery_cp < MaxSector)
3737 seq_printf(seq, "\tresync=PENDING\n ");
3738 }
NeilBrown32a76272005-06-21 17:17:14 -07003739 } else
3740 seq_printf(seq, "\n ");
3741
3742 if ((bitmap = mddev->bitmap)) {
NeilBrown32a76272005-06-21 17:17:14 -07003743 unsigned long chunk_kb;
3744 unsigned long flags;
NeilBrown32a76272005-06-21 17:17:14 -07003745 spin_lock_irqsave(&bitmap->lock, flags);
3746 chunk_kb = bitmap->chunksize >> 10;
3747 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
3748 "%lu%s chunk",
3749 bitmap->pages - bitmap->missing_pages,
3750 bitmap->pages,
3751 (bitmap->pages - bitmap->missing_pages)
3752 << (PAGE_SHIFT - 10),
3753 chunk_kb ? chunk_kb : bitmap->chunksize,
3754 chunk_kb ? "KB" : "B");
NeilBrown78d742d2005-06-21 17:17:15 -07003755 if (bitmap->file) {
3756 seq_printf(seq, ", file: ");
3757 seq_path(seq, bitmap->file->f_vfsmnt,
3758 bitmap->file->f_dentry," \t\n");
NeilBrown32a76272005-06-21 17:17:14 -07003759 }
NeilBrown78d742d2005-06-21 17:17:15 -07003760
NeilBrown32a76272005-06-21 17:17:14 -07003761 seq_printf(seq, "\n");
3762 spin_unlock_irqrestore(&bitmap->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003763 }
3764
3765 seq_printf(seq, "\n");
3766 }
3767 mddev_unlock(mddev);
3768
3769 return 0;
3770}
3771
3772static struct seq_operations md_seq_ops = {
3773 .start = md_seq_start,
3774 .next = md_seq_next,
3775 .stop = md_seq_stop,
3776 .show = md_seq_show,
3777};
3778
3779static int md_seq_open(struct inode *inode, struct file *file)
3780{
3781 int error;
3782
3783 error = seq_open(file, &md_seq_ops);
3784 return error;
3785}
3786
3787static struct file_operations md_seq_fops = {
3788 .open = md_seq_open,
3789 .read = seq_read,
3790 .llseek = seq_lseek,
3791 .release = seq_release,
3792};
3793
3794int register_md_personality(int pnum, mdk_personality_t *p)
3795{
3796 if (pnum >= MAX_PERSONALITY) {
3797 printk(KERN_ERR
3798 "md: tried to install personality %s as nr %d, but max is %lu\n",
3799 p->name, pnum, MAX_PERSONALITY-1);
3800 return -EINVAL;
3801 }
3802
3803 spin_lock(&pers_lock);
3804 if (pers[pnum]) {
3805 spin_unlock(&pers_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003806 return -EBUSY;
3807 }
3808
3809 pers[pnum] = p;
3810 printk(KERN_INFO "md: %s personality registered as nr %d\n", p->name, pnum);
3811 spin_unlock(&pers_lock);
3812 return 0;
3813}
3814
3815int unregister_md_personality(int pnum)
3816{
NeilBrowna757e642005-04-16 15:26:42 -07003817 if (pnum >= MAX_PERSONALITY)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003818 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003819
3820 printk(KERN_INFO "md: %s personality unregistered\n", pers[pnum]->name);
3821 spin_lock(&pers_lock);
3822 pers[pnum] = NULL;
3823 spin_unlock(&pers_lock);
3824 return 0;
3825}
3826
3827static int is_mddev_idle(mddev_t *mddev)
3828{
3829 mdk_rdev_t * rdev;
3830 struct list_head *tmp;
3831 int idle;
3832 unsigned long curr_events;
3833
3834 idle = 1;
3835 ITERATE_RDEV(mddev,rdev,tmp) {
3836 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
Jens Axboea3623572005-11-01 09:26:16 +01003837 curr_events = disk_stat_read(disk, sectors[0]) +
3838 disk_stat_read(disk, sectors[1]) -
Linus Torvalds1da177e2005-04-16 15:20:36 -07003839 atomic_read(&disk->sync_io);
3840 /* Allow some slack between valud of curr_events and last_events,
3841 * as there are some uninteresting races.
3842 * Note: the following is an unsigned comparison.
3843 */
3844 if ((curr_events - rdev->last_events + 32) > 64) {
3845 rdev->last_events = curr_events;
3846 idle = 0;
3847 }
3848 }
3849 return idle;
3850}
3851
3852void md_done_sync(mddev_t *mddev, int blocks, int ok)
3853{
3854 /* another "blocks" (512byte) blocks have been synced */
3855 atomic_sub(blocks, &mddev->recovery_active);
3856 wake_up(&mddev->recovery_wait);
3857 if (!ok) {
3858 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
3859 md_wakeup_thread(mddev->thread);
3860 // stop recovery, signal do_sync ....
3861 }
3862}
3863
3864
NeilBrown06d91a52005-06-21 17:17:12 -07003865/* md_write_start(mddev, bi)
3866 * If we need to update some array metadata (e.g. 'active' flag
NeilBrown3d310eb2005-06-21 17:17:26 -07003867 * in superblock) before writing, schedule a superblock update
3868 * and wait for it to complete.
NeilBrown06d91a52005-06-21 17:17:12 -07003869 */
NeilBrown3d310eb2005-06-21 17:17:26 -07003870void md_write_start(mddev_t *mddev, struct bio *bi)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003871{
NeilBrown06d91a52005-06-21 17:17:12 -07003872 if (bio_data_dir(bi) != WRITE)
NeilBrown3d310eb2005-06-21 17:17:26 -07003873 return;
NeilBrown06d91a52005-06-21 17:17:12 -07003874
NeilBrownf91de922005-11-08 21:39:36 -08003875 BUG_ON(mddev->ro == 1);
3876 if (mddev->ro == 2) {
3877 /* need to switch to read/write */
3878 mddev->ro = 0;
3879 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3880 md_wakeup_thread(mddev->thread);
3881 }
NeilBrown06d91a52005-06-21 17:17:12 -07003882 atomic_inc(&mddev->writes_pending);
NeilBrown06d91a52005-06-21 17:17:12 -07003883 if (mddev->in_sync) {
NeilBrowna9701a32005-11-08 21:39:34 -08003884 spin_lock_irq(&mddev->write_lock);
NeilBrown3d310eb2005-06-21 17:17:26 -07003885 if (mddev->in_sync) {
3886 mddev->in_sync = 0;
3887 mddev->sb_dirty = 1;
3888 md_wakeup_thread(mddev->thread);
3889 }
NeilBrowna9701a32005-11-08 21:39:34 -08003890 spin_unlock_irq(&mddev->write_lock);
NeilBrown06d91a52005-06-21 17:17:12 -07003891 }
NeilBrown3d310eb2005-06-21 17:17:26 -07003892 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003893}
3894
3895void md_write_end(mddev_t *mddev)
3896{
3897 if (atomic_dec_and_test(&mddev->writes_pending)) {
3898 if (mddev->safemode == 2)
3899 md_wakeup_thread(mddev->thread);
3900 else
3901 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
3902 }
3903}
3904
Adrian Bunk75c96f82005-05-05 16:16:09 -07003905static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003906
3907#define SYNC_MARKS 10
3908#define SYNC_MARK_STEP (3*HZ)
3909static void md_do_sync(mddev_t *mddev)
3910{
3911 mddev_t *mddev2;
3912 unsigned int currspeed = 0,
3913 window;
NeilBrown57afd892005-06-21 17:17:13 -07003914 sector_t max_sectors,j, io_sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003915 unsigned long mark[SYNC_MARKS];
3916 sector_t mark_cnt[SYNC_MARKS];
3917 int last_mark,m;
3918 struct list_head *tmp;
3919 sector_t last_check;
NeilBrown57afd892005-06-21 17:17:13 -07003920 int skipped = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003921
3922 /* just incase thread restarts... */
3923 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
3924 return;
3925
3926 /* we overload curr_resync somewhat here.
3927 * 0 == not engaged in resync at all
3928 * 2 == checking that there is no conflict with another sync
3929 * 1 == like 2, but have yielded to allow conflicting resync to
3930 * commense
3931 * other == active in resync - this many blocks
3932 *
3933 * Before starting a resync we must have set curr_resync to
3934 * 2, and then checked that every "conflicting" array has curr_resync
3935 * less than ours. When we find one that is the same or higher
3936 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
3937 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
3938 * This will mean we have to start checking from the beginning again.
3939 *
3940 */
3941
3942 do {
3943 mddev->curr_resync = 2;
3944
3945 try_again:
NeilBrown787453c2005-11-08 21:39:43 -08003946 if (kthread_should_stop()) {
NeilBrown6985c432005-10-19 21:23:47 -07003947 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003948 goto skip;
3949 }
3950 ITERATE_MDDEV(mddev2,tmp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003951 if (mddev2 == mddev)
3952 continue;
3953 if (mddev2->curr_resync &&
3954 match_mddev_units(mddev,mddev2)) {
3955 DEFINE_WAIT(wq);
3956 if (mddev < mddev2 && mddev->curr_resync == 2) {
3957 /* arbitrarily yield */
3958 mddev->curr_resync = 1;
3959 wake_up(&resync_wait);
3960 }
3961 if (mddev > mddev2 && mddev->curr_resync == 1)
3962 /* no need to wait here, we can wait the next
3963 * time 'round when curr_resync == 2
3964 */
3965 continue;
NeilBrown787453c2005-11-08 21:39:43 -08003966 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
3967 if (!kthread_should_stop() &&
NeilBrown8712e552005-10-26 01:58:58 -07003968 mddev2->curr_resync >= mddev->curr_resync) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003969 printk(KERN_INFO "md: delaying resync of %s"
3970 " until %s has finished resync (they"
3971 " share one or more physical units)\n",
3972 mdname(mddev), mdname(mddev2));
3973 mddev_put(mddev2);
3974 schedule();
3975 finish_wait(&resync_wait, &wq);
3976 goto try_again;
3977 }
3978 finish_wait(&resync_wait, &wq);
3979 }
3980 }
3981 } while (mddev->curr_resync < 2);
3982
NeilBrown9d888832005-11-08 21:39:26 -08003983 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003984 /* resync follows the size requested by the personality,
NeilBrown57afd892005-06-21 17:17:13 -07003985 * which defaults to physical size, but can be virtual size
Linus Torvalds1da177e2005-04-16 15:20:36 -07003986 */
3987 max_sectors = mddev->resync_max_sectors;
NeilBrown9d888832005-11-08 21:39:26 -08003988 mddev->resync_mismatches = 0;
3989 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07003990 /* recovery follows the physical size of devices */
3991 max_sectors = mddev->size << 1;
3992
3993 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
3994 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
3995 " %d KB/sec/disc.\n", sysctl_speed_limit_min);
Adrian Bunk338cec32005-09-10 00:26:54 -07003996 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
Linus Torvalds1da177e2005-04-16 15:20:36 -07003997 "(but not more than %d KB/sec) for reconstruction.\n",
3998 sysctl_speed_limit_max);
3999
4000 is_mddev_idle(mddev); /* this also initializes IO event counters */
NeilBrown32a76272005-06-21 17:17:14 -07004001 /* we don't use the checkpoint if there's a bitmap */
NeilBrown24dd4692005-11-08 21:39:26 -08004002 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap
4003 && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004004 j = mddev->recovery_cp;
4005 else
4006 j = 0;
NeilBrown57afd892005-06-21 17:17:13 -07004007 io_sectors = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004008 for (m = 0; m < SYNC_MARKS; m++) {
4009 mark[m] = jiffies;
NeilBrown57afd892005-06-21 17:17:13 -07004010 mark_cnt[m] = io_sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004011 }
4012 last_mark = 0;
4013 mddev->resync_mark = mark[last_mark];
4014 mddev->resync_mark_cnt = mark_cnt[last_mark];
4015
4016 /*
4017 * Tune reconstruction:
4018 */
4019 window = 32*(PAGE_SIZE/512);
4020 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
4021 window/2,(unsigned long long) max_sectors/2);
4022
4023 atomic_set(&mddev->recovery_active, 0);
4024 init_waitqueue_head(&mddev->recovery_wait);
4025 last_check = 0;
4026
4027 if (j>2) {
4028 printk(KERN_INFO
4029 "md: resuming recovery of %s from checkpoint.\n",
4030 mdname(mddev));
4031 mddev->curr_resync = j;
4032 }
4033
4034 while (j < max_sectors) {
NeilBrown57afd892005-06-21 17:17:13 -07004035 sector_t sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004036
NeilBrown57afd892005-06-21 17:17:13 -07004037 skipped = 0;
4038 sectors = mddev->pers->sync_request(mddev, j, &skipped,
4039 currspeed < sysctl_speed_limit_min);
4040 if (sectors == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004041 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4042 goto out;
4043 }
NeilBrown57afd892005-06-21 17:17:13 -07004044
4045 if (!skipped) { /* actual IO requested */
4046 io_sectors += sectors;
4047 atomic_add(sectors, &mddev->recovery_active);
4048 }
4049
Linus Torvalds1da177e2005-04-16 15:20:36 -07004050 j += sectors;
4051 if (j>1) mddev->curr_resync = j;
4052
NeilBrown57afd892005-06-21 17:17:13 -07004053
4054 if (last_check + window > io_sectors || j == max_sectors)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004055 continue;
4056
NeilBrown57afd892005-06-21 17:17:13 -07004057 last_check = io_sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004058
4059 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
4060 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
4061 break;
4062
4063 repeat:
4064 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
4065 /* step marks */
4066 int next = (last_mark+1) % SYNC_MARKS;
4067
4068 mddev->resync_mark = mark[next];
4069 mddev->resync_mark_cnt = mark_cnt[next];
4070 mark[next] = jiffies;
NeilBrown57afd892005-06-21 17:17:13 -07004071 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004072 last_mark = next;
4073 }
4074
4075
NeilBrown787453c2005-11-08 21:39:43 -08004076 if (kthread_should_stop()) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004077 /*
4078 * got a signal, exit.
4079 */
4080 printk(KERN_INFO
4081 "md: md_do_sync() got signal ... exiting\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07004082 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4083 goto out;
4084 }
4085
4086 /*
4087 * this loop exits only if either when we are slower than
4088 * the 'hard' speed limit, or the system was IO-idle for
4089 * a jiffy.
4090 * the system might be non-idle CPU-wise, but we only care
4091 * about not overloading the IO subsystem. (things like an
4092 * e2fsck being done on the RAID array should execute fast)
4093 */
4094 mddev->queue->unplug_fn(mddev->queue);
4095 cond_resched();
4096
NeilBrown57afd892005-06-21 17:17:13 -07004097 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
4098 /((jiffies-mddev->resync_mark)/HZ +1) +1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004099
4100 if (currspeed > sysctl_speed_limit_min) {
4101 if ((currspeed > sysctl_speed_limit_max) ||
4102 !is_mddev_idle(mddev)) {
NeilBrown787453c2005-11-08 21:39:43 -08004103 msleep(250);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004104 goto repeat;
4105 }
4106 }
4107 }
4108 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
4109 /*
4110 * this also signals 'finished resyncing' to md_stop
4111 */
4112 out:
4113 mddev->queue->unplug_fn(mddev->queue);
4114
4115 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
4116
4117 /* tell personality that we are finished */
NeilBrown57afd892005-06-21 17:17:13 -07004118 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004119
4120 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4121 mddev->curr_resync > 2 &&
4122 mddev->curr_resync >= mddev->recovery_cp) {
4123 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4124 printk(KERN_INFO
4125 "md: checkpointing recovery of %s.\n",
4126 mdname(mddev));
4127 mddev->recovery_cp = mddev->curr_resync;
4128 } else
4129 mddev->recovery_cp = MaxSector;
4130 }
4131
Linus Torvalds1da177e2005-04-16 15:20:36 -07004132 skip:
4133 mddev->curr_resync = 0;
4134 wake_up(&resync_wait);
4135 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
4136 md_wakeup_thread(mddev->thread);
4137}
4138
4139
4140/*
4141 * This routine is regularly called by all per-raid-array threads to
4142 * deal with generic issues like resync and super-block update.
4143 * Raid personalities that don't have a thread (linear/raid0) do not
4144 * need this as they never do any recovery or update the superblock.
4145 *
4146 * It does not do any resync itself, but rather "forks" off other threads
4147 * to do that as needed.
4148 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4149 * "->recovery" and create a thread at ->sync_thread.
4150 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4151 * and wakeups up this thread which will reap the thread and finish up.
4152 * This thread also removes any faulty devices (with nr_pending == 0).
4153 *
4154 * The overall approach is:
4155 * 1/ if the superblock needs updating, update it.
4156 * 2/ If a recovery thread is running, don't do anything else.
4157 * 3/ If recovery has finished, clean up, possibly marking spares active.
4158 * 4/ If there are any faulty devices, remove them.
4159 * 5/ If array is degraded, try to add spares devices
4160 * 6/ If array has spares or is not in-sync, start a resync thread.
4161 */
4162void md_check_recovery(mddev_t *mddev)
4163{
4164 mdk_rdev_t *rdev;
4165 struct list_head *rtmp;
4166
4167
NeilBrown5f404022005-06-21 17:17:16 -07004168 if (mddev->bitmap)
4169 bitmap_daemon_work(mddev->bitmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004170
4171 if (mddev->ro)
4172 return;
NeilBrownfca4d842005-06-21 17:17:11 -07004173
4174 if (signal_pending(current)) {
4175 if (mddev->pers->sync_request) {
4176 printk(KERN_INFO "md: %s in immediate safe mode\n",
4177 mdname(mddev));
4178 mddev->safemode = 2;
4179 }
4180 flush_signals(current);
4181 }
4182
Linus Torvalds1da177e2005-04-16 15:20:36 -07004183 if ( ! (
4184 mddev->sb_dirty ||
4185 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
NeilBrownfca4d842005-06-21 17:17:11 -07004186 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
4187 (mddev->safemode == 1) ||
4188 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
4189 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004190 ))
4191 return;
NeilBrownfca4d842005-06-21 17:17:11 -07004192
Linus Torvalds1da177e2005-04-16 15:20:36 -07004193 if (mddev_trylock(mddev)==0) {
4194 int spares =0;
NeilBrownfca4d842005-06-21 17:17:11 -07004195
NeilBrowna9701a32005-11-08 21:39:34 -08004196 spin_lock_irq(&mddev->write_lock);
NeilBrownfca4d842005-06-21 17:17:11 -07004197 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
4198 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
4199 mddev->in_sync = 1;
4200 mddev->sb_dirty = 1;
4201 }
4202 if (mddev->safemode == 1)
4203 mddev->safemode = 0;
NeilBrowna9701a32005-11-08 21:39:34 -08004204 spin_unlock_irq(&mddev->write_lock);
NeilBrownfca4d842005-06-21 17:17:11 -07004205
Linus Torvalds1da177e2005-04-16 15:20:36 -07004206 if (mddev->sb_dirty)
4207 md_update_sb(mddev);
NeilBrown06d91a52005-06-21 17:17:12 -07004208
NeilBrown06d91a52005-06-21 17:17:12 -07004209
Linus Torvalds1da177e2005-04-16 15:20:36 -07004210 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4211 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
4212 /* resync/recovery still happening */
4213 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4214 goto unlock;
4215 }
4216 if (mddev->sync_thread) {
4217 /* resync has finished, collect result */
4218 md_unregister_thread(mddev->sync_thread);
4219 mddev->sync_thread = NULL;
4220 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4221 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4222 /* success...*/
4223 /* activate any spares */
4224 mddev->pers->spare_active(mddev);
4225 }
4226 md_update_sb(mddev);
NeilBrown41158c72005-06-21 17:17:25 -07004227
4228 /* if array is no-longer degraded, then any saved_raid_disk
4229 * information must be scrapped
4230 */
4231 if (!mddev->degraded)
4232 ITERATE_RDEV(mddev,rdev,rtmp)
4233 rdev->saved_raid_disk = -1;
4234
Linus Torvalds1da177e2005-04-16 15:20:36 -07004235 mddev->recovery = 0;
4236 /* flag recovery needed just to double check */
4237 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4238 goto unlock;
4239 }
NeilBrown24dd4692005-11-08 21:39:26 -08004240 /* Clear some bits that don't mean anything, but
4241 * might be left set
4242 */
4243 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4244 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
4245 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
4246 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004247
4248 /* no recovery is running.
4249 * remove any failed drives, then
4250 * add spares if possible.
4251 * Spare are also removed and re-added, to allow
4252 * the personality to fail the re-add.
4253 */
4254 ITERATE_RDEV(mddev,rdev,rtmp)
4255 if (rdev->raid_disk >= 0 &&
NeilBrownb2d444d2005-11-08 21:39:31 -08004256 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07004257 atomic_read(&rdev->nr_pending)==0) {
NeilBrown86e6ffd2005-11-08 21:39:24 -08004258 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
4259 char nm[20];
4260 sprintf(nm,"rd%d", rdev->raid_disk);
4261 sysfs_remove_link(&mddev->kobj, nm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004262 rdev->raid_disk = -1;
NeilBrown86e6ffd2005-11-08 21:39:24 -08004263 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004264 }
4265
4266 if (mddev->degraded) {
4267 ITERATE_RDEV(mddev,rdev,rtmp)
4268 if (rdev->raid_disk < 0
NeilBrownb2d444d2005-11-08 21:39:31 -08004269 && !test_bit(Faulty, &rdev->flags)) {
NeilBrown86e6ffd2005-11-08 21:39:24 -08004270 if (mddev->pers->hot_add_disk(mddev,rdev)) {
4271 char nm[20];
4272 sprintf(nm, "rd%d", rdev->raid_disk);
4273 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004274 spares++;
NeilBrown86e6ffd2005-11-08 21:39:24 -08004275 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07004276 break;
4277 }
4278 }
4279
NeilBrown24dd4692005-11-08 21:39:26 -08004280 if (spares) {
4281 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4282 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4283 } else if (mddev->recovery_cp < MaxSector) {
4284 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4285 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4286 /* nothing to be done ... */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004287 goto unlock;
NeilBrown24dd4692005-11-08 21:39:26 -08004288
Linus Torvalds1da177e2005-04-16 15:20:36 -07004289 if (mddev->pers->sync_request) {
4290 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
NeilBrowna654b9d82005-06-21 17:17:27 -07004291 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
4292 /* We are adding a device or devices to an array
4293 * which has the bitmap stored on all devices.
4294 * So make sure all bitmap pages get written
4295 */
4296 bitmap_write_all(mddev->bitmap);
4297 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004298 mddev->sync_thread = md_register_thread(md_do_sync,
4299 mddev,
4300 "%s_resync");
4301 if (!mddev->sync_thread) {
4302 printk(KERN_ERR "%s: could not start resync"
4303 " thread...\n",
4304 mdname(mddev));
4305 /* leave the spares where they are, it shouldn't hurt */
4306 mddev->recovery = 0;
4307 } else {
4308 md_wakeup_thread(mddev->sync_thread);
4309 }
4310 }
4311 unlock:
4312 mddev_unlock(mddev);
4313 }
4314}
4315
Adrian Bunk75c96f82005-05-05 16:16:09 -07004316static int md_notify_reboot(struct notifier_block *this,
4317 unsigned long code, void *x)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004318{
4319 struct list_head *tmp;
4320 mddev_t *mddev;
4321
4322 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
4323
4324 printk(KERN_INFO "md: stopping all md devices.\n");
4325
4326 ITERATE_MDDEV(mddev,tmp)
4327 if (mddev_trylock(mddev)==0)
4328 do_md_stop (mddev, 1);
4329 /*
4330 * certain more exotic SCSI devices are known to be
4331 * volatile wrt too early system reboots. While the
4332 * right place to handle this issue is the given
4333 * driver, we do want to have a safe RAID driver ...
4334 */
4335 mdelay(1000*1);
4336 }
4337 return NOTIFY_DONE;
4338}
4339
Adrian Bunk75c96f82005-05-05 16:16:09 -07004340static struct notifier_block md_notifier = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004341 .notifier_call = md_notify_reboot,
4342 .next = NULL,
4343 .priority = INT_MAX, /* before any real devices */
4344};
4345
4346static void md_geninit(void)
4347{
4348 struct proc_dir_entry *p;
4349
4350 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
4351
4352 p = create_proc_entry("mdstat", S_IRUGO, NULL);
4353 if (p)
4354 p->proc_fops = &md_seq_fops;
4355}
4356
Adrian Bunk75c96f82005-05-05 16:16:09 -07004357static int __init md_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004358{
4359 int minor;
4360
4361 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4362 " MD_SB_DISKS=%d\n",
4363 MD_MAJOR_VERSION, MD_MINOR_VERSION,
4364 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
NeilBrownbd926c62005-11-08 21:39:32 -08004365 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
NeilBrown32a76272005-06-21 17:17:14 -07004366 BITMAP_MINOR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004367
4368 if (register_blkdev(MAJOR_NR, "md"))
4369 return -1;
4370 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
4371 unregister_blkdev(MAJOR_NR, "md");
4372 return -1;
4373 }
4374 devfs_mk_dir("md");
4375 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
4376 md_probe, NULL, NULL);
4377 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
4378 md_probe, NULL, NULL);
4379
4380 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4381 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
4382 S_IFBLK|S_IRUSR|S_IWUSR,
4383 "md/%d", minor);
4384
4385 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4386 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
4387 S_IFBLK|S_IRUSR|S_IWUSR,
4388 "md/mdp%d", minor);
4389
4390
4391 register_reboot_notifier(&md_notifier);
4392 raid_table_header = register_sysctl_table(raid_root_table, 1);
4393
4394 md_geninit();
4395 return (0);
4396}
4397
4398
4399#ifndef MODULE
4400
4401/*
4402 * Searches all registered partitions for autorun RAID arrays
4403 * at boot time.
4404 */
4405static dev_t detected_devices[128];
4406static int dev_cnt;
4407
4408void md_autodetect_dev(dev_t dev)
4409{
4410 if (dev_cnt >= 0 && dev_cnt < 127)
4411 detected_devices[dev_cnt++] = dev;
4412}
4413
4414
4415static void autostart_arrays(int part)
4416{
4417 mdk_rdev_t *rdev;
4418 int i;
4419
4420 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
4421
4422 for (i = 0; i < dev_cnt; i++) {
4423 dev_t dev = detected_devices[i];
4424
4425 rdev = md_import_device(dev,0, 0);
4426 if (IS_ERR(rdev))
4427 continue;
4428
NeilBrownb2d444d2005-11-08 21:39:31 -08004429 if (test_bit(Faulty, &rdev->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004430 MD_BUG();
4431 continue;
4432 }
4433 list_add(&rdev->same_set, &pending_raid_disks);
4434 }
4435 dev_cnt = 0;
4436
4437 autorun_devices(part);
4438}
4439
4440#endif
4441
4442static __exit void md_exit(void)
4443{
4444 mddev_t *mddev;
4445 struct list_head *tmp;
4446 int i;
4447 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
4448 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
4449 for (i=0; i < MAX_MD_DEVS; i++)
4450 devfs_remove("md/%d", i);
4451 for (i=0; i < MAX_MD_DEVS; i++)
4452 devfs_remove("md/d%d", i);
4453
4454 devfs_remove("md");
4455
4456 unregister_blkdev(MAJOR_NR,"md");
4457 unregister_blkdev(mdp_major, "mdp");
4458 unregister_reboot_notifier(&md_notifier);
4459 unregister_sysctl_table(raid_table_header);
4460 remove_proc_entry("mdstat", NULL);
4461 ITERATE_MDDEV(mddev,tmp) {
4462 struct gendisk *disk = mddev->gendisk;
4463 if (!disk)
4464 continue;
4465 export_array(mddev);
4466 del_gendisk(disk);
4467 put_disk(disk);
4468 mddev->gendisk = NULL;
4469 mddev_put(mddev);
4470 }
4471}
4472
4473module_init(md_init)
4474module_exit(md_exit)
4475
NeilBrownf91de922005-11-08 21:39:36 -08004476static int get_ro(char *buffer, struct kernel_param *kp)
4477{
4478 return sprintf(buffer, "%d", start_readonly);
4479}
4480static int set_ro(const char *val, struct kernel_param *kp)
4481{
4482 char *e;
4483 int num = simple_strtoul(val, &e, 10);
4484 if (*val && (*e == '\0' || *e == '\n')) {
4485 start_readonly = num;
4486 return 0;;
4487 }
4488 return -EINVAL;
4489}
4490
4491module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
4492
Linus Torvalds1da177e2005-04-16 15:20:36 -07004493EXPORT_SYMBOL(register_md_personality);
4494EXPORT_SYMBOL(unregister_md_personality);
4495EXPORT_SYMBOL(md_error);
4496EXPORT_SYMBOL(md_done_sync);
4497EXPORT_SYMBOL(md_write_start);
4498EXPORT_SYMBOL(md_write_end);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004499EXPORT_SYMBOL(md_register_thread);
4500EXPORT_SYMBOL(md_unregister_thread);
4501EXPORT_SYMBOL(md_wakeup_thread);
4502EXPORT_SYMBOL(md_print_devices);
4503EXPORT_SYMBOL(md_check_recovery);
4504MODULE_LICENSE("GPL");
NeilBrownaa1595e2005-08-04 12:53:32 -07004505MODULE_ALIAS("md");
NeilBrown72008652005-08-26 18:34:15 -07004506MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);