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[PATCH] md: Make sure QUEUE_FLAG_CLUSTER is set properly for md.
[linux-2.6/mini2440.git] / drivers / md / md.c
blob3254ff1a5cc95ecb979c24258c61ef00157be4ec
1 /*
2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
4
5 completely rewritten, based on the MD driver code from Marc Zyngier
6
7 Changes:
8
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
16
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
19
20 Neil Brown <neilb@cse.unsw.edu.au>.
21
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
24
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
28 any later version.
29
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
33 */
34
35 #include <linux/module.h>
36 #include <linux/config.h>
37 #include <linux/kthread.h>
38 #include <linux/linkage.h>
39 #include <linux/raid/md.h>
40 #include <linux/raid/bitmap.h>
41 #include <linux/sysctl.h>
42 #include <linux/devfs_fs_kernel.h>
43 #include <linux/buffer_head.h> /* for invalidate_bdev */
44 #include <linux/suspend.h>
45 #include <linux/poll.h>
46
47 #include <linux/init.h>
48
49 #include <linux/file.h>
50
51 #ifdef CONFIG_KMOD
52 #include <linux/kmod.h>
53 #endif
54
55 #include <asm/unaligned.h>
56
57 #define MAJOR_NR MD_MAJOR
58 #define MD_DRIVER
59
60 /* 63 partitions with the alternate major number (mdp) */
61 #define MdpMinorShift 6
62
63 #define DEBUG 0
64 #define dprintk(x...) ((void)(DEBUG && printk(x)))
65
66
67 #ifndef MODULE
68 static void autostart_arrays (int part);
69 #endif
70
71 static LIST_HEAD(pers_list);
72 static DEFINE_SPINLOCK(pers_lock);
73
74 /*
75 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
76 * is 1000 KB/sec, so the extra system load does not show up that much.
77 * Increase it if you want to have more _guaranteed_ speed. Note that
78 * the RAID driver will use the maximum available bandwidth if the IO
79 * subsystem is idle. There is also an 'absolute maximum' reconstruction
80 * speed limit - in case reconstruction slows down your system despite
81 * idle IO detection.
82 *
83 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
84 * or /sys/block/mdX/md/sync_speed_{min,max}
85 */
86
87 static int sysctl_speed_limit_min = 1000;
88 static int sysctl_speed_limit_max = 200000;
89 static inline int speed_min(mddev_t *mddev)
90 {
91 return mddev->sync_speed_min ?
92 mddev->sync_speed_min : sysctl_speed_limit_min;
93 }
94
95 static inline int speed_max(mddev_t *mddev)
96 {
97 return mddev->sync_speed_max ?
98 mddev->sync_speed_max : sysctl_speed_limit_max;
99 }
100
101 static struct ctl_table_header *raid_table_header;
102
103 static ctl_table raid_table[] = {
104 {
105 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
106 .procname = "speed_limit_min",
107 .data = &sysctl_speed_limit_min,
108 .maxlen = sizeof(int),
109 .mode = 0644,
110 .proc_handler = &proc_dointvec,
111 },
112 {
113 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
114 .procname = "speed_limit_max",
115 .data = &sysctl_speed_limit_max,
116 .maxlen = sizeof(int),
117 .mode = 0644,
118 .proc_handler = &proc_dointvec,
119 },
120 { .ctl_name = 0 }
121 };
122
123 static ctl_table raid_dir_table[] = {
124 {
125 .ctl_name = DEV_RAID,
126 .procname = "raid",
127 .maxlen = 0,
128 .mode = 0555,
129 .child = raid_table,
130 },
131 { .ctl_name = 0 }
132 };
133
134 static ctl_table raid_root_table[] = {
135 {
136 .ctl_name = CTL_DEV,
137 .procname = "dev",
138 .maxlen = 0,
139 .mode = 0555,
140 .child = raid_dir_table,
141 },
142 { .ctl_name = 0 }
143 };
144
145 static struct block_device_operations md_fops;
146
147 static int start_readonly;
148
149 /*
150 * We have a system wide 'event count' that is incremented
151 * on any 'interesting' event, and readers of /proc/mdstat
152 * can use 'poll' or 'select' to find out when the event
153 * count increases.
154 *
155 * Events are:
156 * start array, stop array, error, add device, remove device,
157 * start build, activate spare
158 */
159 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
160 static atomic_t md_event_count;
161 static void md_new_event(mddev_t *mddev)
162 {
163 atomic_inc(&md_event_count);
164 wake_up(&md_event_waiters);
165 }
166
167 /*
168 * Enables to iterate over all existing md arrays
169 * all_mddevs_lock protects this list.
170 */
171 static LIST_HEAD(all_mddevs);
172 static DEFINE_SPINLOCK(all_mddevs_lock);
173
174
175 /*
176 * iterates through all used mddevs in the system.
177 * We take care to grab the all_mddevs_lock whenever navigating
178 * the list, and to always hold a refcount when unlocked.
179 * Any code which breaks out of this loop while own
180 * a reference to the current mddev and must mddev_put it.
181 */
182 #define ITERATE_MDDEV(mddev,tmp) \
183 \
184 for (({ spin_lock(&all_mddevs_lock); \
185 tmp = all_mddevs.next; \
186 mddev = NULL;}); \
187 ({ if (tmp != &all_mddevs) \
188 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
189 spin_unlock(&all_mddevs_lock); \
190 if (mddev) mddev_put(mddev); \
191 mddev = list_entry(tmp, mddev_t, all_mddevs); \
192 tmp != &all_mddevs;}); \
193 ({ spin_lock(&all_mddevs_lock); \
194 tmp = tmp->next;}) \
195 )
196
197
198 static int md_fail_request (request_queue_t *q, struct bio *bio)
199 {
200 bio_io_error(bio, bio->bi_size);
201 return 0;
202 }
203
204 static inline mddev_t *mddev_get(mddev_t *mddev)
205 {
206 atomic_inc(&mddev->active);
207 return mddev;
208 }
209
210 static void mddev_put(mddev_t *mddev)
211 {
212 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
213 return;
214 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
215 list_del(&mddev->all_mddevs);
216 /* that blocks */
217 blk_cleanup_queue(mddev->queue);
218 /* that also blocks */
219 kobject_unregister(&mddev->kobj);
220 /* result blows... */
221 }
222 spin_unlock(&all_mddevs_lock);
223 }
224
225 static mddev_t * mddev_find(dev_t unit)
226 {
227 mddev_t *mddev, *new = NULL;
228
229 retry:
230 spin_lock(&all_mddevs_lock);
231 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
232 if (mddev->unit == unit) {
233 mddev_get(mddev);
234 spin_unlock(&all_mddevs_lock);
235 kfree(new);
236 return mddev;
237 }
238
239 if (new) {
240 list_add(&new->all_mddevs, &all_mddevs);
241 spin_unlock(&all_mddevs_lock);
242 return new;
243 }
244 spin_unlock(&all_mddevs_lock);
245
246 new = kzalloc(sizeof(*new), GFP_KERNEL);
247 if (!new)
248 return NULL;
249
250 new->unit = unit;
251 if (MAJOR(unit) == MD_MAJOR)
252 new->md_minor = MINOR(unit);
253 else
254 new->md_minor = MINOR(unit) >> MdpMinorShift;
255
256 init_MUTEX(&new->reconfig_sem);
257 INIT_LIST_HEAD(&new->disks);
258 INIT_LIST_HEAD(&new->all_mddevs);
259 init_timer(&new->safemode_timer);
260 atomic_set(&new->active, 1);
261 spin_lock_init(&new->write_lock);
262 init_waitqueue_head(&new->sb_wait);
263
264 new->queue = blk_alloc_queue(GFP_KERNEL);
265 if (!new->queue) {
266 kfree(new);
267 return NULL;
268 }
269 set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags);
270
271 blk_queue_make_request(new->queue, md_fail_request);
272
273 goto retry;
274 }
275
276 static inline int mddev_lock(mddev_t * mddev)
277 {
278 return down_interruptible(&mddev->reconfig_sem);
279 }
280
281 static inline void mddev_lock_uninterruptible(mddev_t * mddev)
282 {
283 down(&mddev->reconfig_sem);
284 }
285
286 static inline int mddev_trylock(mddev_t * mddev)
287 {
288 return down_trylock(&mddev->reconfig_sem);
289 }
290
291 static inline void mddev_unlock(mddev_t * mddev)
292 {
293 up(&mddev->reconfig_sem);
294
295 md_wakeup_thread(mddev->thread);
296 }
297
298 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
299 {
300 mdk_rdev_t * rdev;
301 struct list_head *tmp;
302
303 ITERATE_RDEV(mddev,rdev,tmp) {
304 if (rdev->desc_nr == nr)
305 return rdev;
306 }
307 return NULL;
308 }
309
310 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
311 {
312 struct list_head *tmp;
313 mdk_rdev_t *rdev;
314
315 ITERATE_RDEV(mddev,rdev,tmp) {
316 if (rdev->bdev->bd_dev == dev)
317 return rdev;
318 }
319 return NULL;
320 }
321
322 static struct mdk_personality *find_pers(int level, char *clevel)
323 {
324 struct mdk_personality *pers;
325 list_for_each_entry(pers, &pers_list, list) {
326 if (level != LEVEL_NONE && pers->level == level)
327 return pers;
328 if (strcmp(pers->name, clevel)==0)
329 return pers;
330 }
331 return NULL;
332 }
333
334 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
335 {
336 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
337 return MD_NEW_SIZE_BLOCKS(size);
338 }
339
340 static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
341 {
342 sector_t size;
343
344 size = rdev->sb_offset;
345
346 if (chunk_size)
347 size &= ~((sector_t)chunk_size/1024 - 1);
348 return size;
349 }
350
351 static int alloc_disk_sb(mdk_rdev_t * rdev)
352 {
353 if (rdev->sb_page)
354 MD_BUG();
355
356 rdev->sb_page = alloc_page(GFP_KERNEL);
357 if (!rdev->sb_page) {
358 printk(KERN_ALERT "md: out of memory.\n");
359 return -EINVAL;
360 }
361
362 return 0;
363 }
364
365 static void free_disk_sb(mdk_rdev_t * rdev)
366 {
367 if (rdev->sb_page) {
368 put_page(rdev->sb_page);
369 rdev->sb_loaded = 0;
370 rdev->sb_page = NULL;
371 rdev->sb_offset = 0;
372 rdev->size = 0;
373 }
374 }
375
376
377 static int super_written(struct bio *bio, unsigned int bytes_done, int error)
378 {
379 mdk_rdev_t *rdev = bio->bi_private;
380 mddev_t *mddev = rdev->mddev;
381 if (bio->bi_size)
382 return 1;
383
384 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags))
385 md_error(mddev, rdev);
386
387 if (atomic_dec_and_test(&mddev->pending_writes))
388 wake_up(&mddev->sb_wait);
389 bio_put(bio);
390 return 0;
391 }
392
393 static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
394 {
395 struct bio *bio2 = bio->bi_private;
396 mdk_rdev_t *rdev = bio2->bi_private;
397 mddev_t *mddev = rdev->mddev;
398 if (bio->bi_size)
399 return 1;
400
401 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
402 error == -EOPNOTSUPP) {
403 unsigned long flags;
404 /* barriers don't appear to be supported :-( */
405 set_bit(BarriersNotsupp, &rdev->flags);
406 mddev->barriers_work = 0;
407 spin_lock_irqsave(&mddev->write_lock, flags);
408 bio2->bi_next = mddev->biolist;
409 mddev->biolist = bio2;
410 spin_unlock_irqrestore(&mddev->write_lock, flags);
411 wake_up(&mddev->sb_wait);
412 bio_put(bio);
413 return 0;
414 }
415 bio_put(bio2);
416 bio->bi_private = rdev;
417 return super_written(bio, bytes_done, error);
418 }
419
420 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
421 sector_t sector, int size, struct page *page)
422 {
423 /* write first size bytes of page to sector of rdev
424 * Increment mddev->pending_writes before returning
425 * and decrement it on completion, waking up sb_wait
426 * if zero is reached.
427 * If an error occurred, call md_error
428 *
429 * As we might need to resubmit the request if BIO_RW_BARRIER
430 * causes ENOTSUPP, we allocate a spare bio...
431 */
432 struct bio *bio = bio_alloc(GFP_NOIO, 1);
433 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
434
435 bio->bi_bdev = rdev->bdev;
436 bio->bi_sector = sector;
437 bio_add_page(bio, page, size, 0);
438 bio->bi_private = rdev;
439 bio->bi_end_io = super_written;
440 bio->bi_rw = rw;
441
442 atomic_inc(&mddev->pending_writes);
443 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
444 struct bio *rbio;
445 rw |= (1<<BIO_RW_BARRIER);
446 rbio = bio_clone(bio, GFP_NOIO);
447 rbio->bi_private = bio;
448 rbio->bi_end_io = super_written_barrier;
449 submit_bio(rw, rbio);
450 } else
451 submit_bio(rw, bio);
452 }
453
454 void md_super_wait(mddev_t *mddev)
455 {
456 /* wait for all superblock writes that were scheduled to complete.
457 * if any had to be retried (due to BARRIER problems), retry them
458 */
459 DEFINE_WAIT(wq);
460 for(;;) {
461 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
462 if (atomic_read(&mddev->pending_writes)==0)
463 break;
464 while (mddev->biolist) {
465 struct bio *bio;
466 spin_lock_irq(&mddev->write_lock);
467 bio = mddev->biolist;
468 mddev->biolist = bio->bi_next ;
469 bio->bi_next = NULL;
470 spin_unlock_irq(&mddev->write_lock);
471 submit_bio(bio->bi_rw, bio);
472 }
473 schedule();
474 }
475 finish_wait(&mddev->sb_wait, &wq);
476 }
477
478 static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
479 {
480 if (bio->bi_size)
481 return 1;
482
483 complete((struct completion*)bio->bi_private);
484 return 0;
485 }
486
487 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
488 struct page *page, int rw)
489 {
490 struct bio *bio = bio_alloc(GFP_NOIO, 1);
491 struct completion event;
492 int ret;
493
494 rw |= (1 << BIO_RW_SYNC);
495
496 bio->bi_bdev = bdev;
497 bio->bi_sector = sector;
498 bio_add_page(bio, page, size, 0);
499 init_completion(&event);
500 bio->bi_private = &event;
501 bio->bi_end_io = bi_complete;
502 submit_bio(rw, bio);
503 wait_for_completion(&event);
504
505 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
506 bio_put(bio);
507 return ret;
508 }
509 EXPORT_SYMBOL_GPL(sync_page_io);
510
511 static int read_disk_sb(mdk_rdev_t * rdev, int size)
512 {
513 char b[BDEVNAME_SIZE];
514 if (!rdev->sb_page) {
515 MD_BUG();
516 return -EINVAL;
517 }
518 if (rdev->sb_loaded)
519 return 0;
520
521
522 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
523 goto fail;
524 rdev->sb_loaded = 1;
525 return 0;
526
527 fail:
528 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
529 bdevname(rdev->bdev,b));
530 return -EINVAL;
531 }
532
533 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
534 {
535 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
536 (sb1->set_uuid1 == sb2->set_uuid1) &&
537 (sb1->set_uuid2 == sb2->set_uuid2) &&
538 (sb1->set_uuid3 == sb2->set_uuid3))
539
540 return 1;
541
542 return 0;
543 }
544
545
546 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
547 {
548 int ret;
549 mdp_super_t *tmp1, *tmp2;
550
551 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
552 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
553
554 if (!tmp1 || !tmp2) {
555 ret = 0;
556 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
557 goto abort;
558 }
559
560 *tmp1 = *sb1;
561 *tmp2 = *sb2;
562
563 /*
564 * nr_disks is not constant
565 */
566 tmp1->nr_disks = 0;
567 tmp2->nr_disks = 0;
568
569 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
570 ret = 0;
571 else
572 ret = 1;
573
574 abort:
575 kfree(tmp1);
576 kfree(tmp2);
577 return ret;
578 }
579
580 static unsigned int calc_sb_csum(mdp_super_t * sb)
581 {
582 unsigned int disk_csum, csum;
583
584 disk_csum = sb->sb_csum;
585 sb->sb_csum = 0;
586 csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
587 sb->sb_csum = disk_csum;
588 return csum;
589 }
590
591
592 /*
593 * Handle superblock details.
594 * We want to be able to handle multiple superblock formats
595 * so we have a common interface to them all, and an array of
596 * different handlers.
597 * We rely on user-space to write the initial superblock, and support
598 * reading and updating of superblocks.
599 * Interface methods are:
600 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
601 * loads and validates a superblock on dev.
602 * if refdev != NULL, compare superblocks on both devices
603 * Return:
604 * 0 - dev has a superblock that is compatible with refdev
605 * 1 - dev has a superblock that is compatible and newer than refdev
606 * so dev should be used as the refdev in future
607 * -EINVAL superblock incompatible or invalid
608 * -othererror e.g. -EIO
609 *
610 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
611 * Verify that dev is acceptable into mddev.
612 * The first time, mddev->raid_disks will be 0, and data from
613 * dev should be merged in. Subsequent calls check that dev
614 * is new enough. Return 0 or -EINVAL
615 *
616 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
617 * Update the superblock for rdev with data in mddev
618 * This does not write to disc.
619 *
620 */
621
622 struct super_type {
623 char *name;
624 struct module *owner;
625 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
626 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
627 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
628 };
629
630 /*
631 * load_super for 0.90.0
632 */
633 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
634 {
635 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
636 mdp_super_t *sb;
637 int ret;
638 sector_t sb_offset;
639
640 /*
641 * Calculate the position of the superblock,
642 * it's at the end of the disk.
643 *
644 * It also happens to be a multiple of 4Kb.
645 */
646 sb_offset = calc_dev_sboffset(rdev->bdev);
647 rdev->sb_offset = sb_offset;
648
649 ret = read_disk_sb(rdev, MD_SB_BYTES);
650 if (ret) return ret;
651
652 ret = -EINVAL;
653
654 bdevname(rdev->bdev, b);
655 sb = (mdp_super_t*)page_address(rdev->sb_page);
656
657 if (sb->md_magic != MD_SB_MAGIC) {
658 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
659 b);
660 goto abort;
661 }
662
663 if (sb->major_version != 0 ||
664 sb->minor_version != 90) {
665 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
666 sb->major_version, sb->minor_version,
667 b);
668 goto abort;
669 }
670
671 if (sb->raid_disks <= 0)
672 goto abort;
673
674 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
675 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
676 b);
677 goto abort;
678 }
679
680 rdev->preferred_minor = sb->md_minor;
681 rdev->data_offset = 0;
682 rdev->sb_size = MD_SB_BYTES;
683
684 if (sb->level == LEVEL_MULTIPATH)
685 rdev->desc_nr = -1;
686 else
687 rdev->desc_nr = sb->this_disk.number;
688
689 if (refdev == 0)
690 ret = 1;
691 else {
692 __u64 ev1, ev2;
693 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
694 if (!uuid_equal(refsb, sb)) {
695 printk(KERN_WARNING "md: %s has different UUID to %s\n",
696 b, bdevname(refdev->bdev,b2));
697 goto abort;
698 }
699 if (!sb_equal(refsb, sb)) {
700 printk(KERN_WARNING "md: %s has same UUID"
701 " but different superblock to %s\n",
702 b, bdevname(refdev->bdev, b2));
703 goto abort;
704 }
705 ev1 = md_event(sb);
706 ev2 = md_event(refsb);
707 if (ev1 > ev2)
708 ret = 1;
709 else
710 ret = 0;
711 }
712 rdev->size = calc_dev_size(rdev, sb->chunk_size);
713
714 if (rdev->size < sb->size && sb->level > 1)
715 /* "this cannot possibly happen" ... */
716 ret = -EINVAL;
717
718 abort:
719 return ret;
720 }
721
722 /*
723 * validate_super for 0.90.0
724 */
725 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
726 {
727 mdp_disk_t *desc;
728 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
729
730 rdev->raid_disk = -1;
731 rdev->flags = 0;
732 if (mddev->raid_disks == 0) {
733 mddev->major_version = 0;
734 mddev->minor_version = sb->minor_version;
735 mddev->patch_version = sb->patch_version;
736 mddev->persistent = ! sb->not_persistent;
737 mddev->chunk_size = sb->chunk_size;
738 mddev->ctime = sb->ctime;
739 mddev->utime = sb->utime;
740 mddev->level = sb->level;
741 mddev->clevel[0] = 0;
742 mddev->layout = sb->layout;
743 mddev->raid_disks = sb->raid_disks;
744 mddev->size = sb->size;
745 mddev->events = md_event(sb);
746 mddev->bitmap_offset = 0;
747 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
748
749 if (sb->state & (1<<MD_SB_CLEAN))
750 mddev->recovery_cp = MaxSector;
751 else {
752 if (sb->events_hi == sb->cp_events_hi &&
753 sb->events_lo == sb->cp_events_lo) {
754 mddev->recovery_cp = sb->recovery_cp;
755 } else
756 mddev->recovery_cp = 0;
757 }
758
759 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
760 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
761 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
762 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
763
764 mddev->max_disks = MD_SB_DISKS;
765
766 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
767 mddev->bitmap_file == NULL) {
768 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
769 && mddev->level != 10) {
770 /* FIXME use a better test */
771 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
772 return -EINVAL;
773 }
774 mddev->bitmap_offset = mddev->default_bitmap_offset;
775 }
776
777 } else if (mddev->pers == NULL) {
778 /* Insist on good event counter while assembling */
779 __u64 ev1 = md_event(sb);
780 ++ev1;
781 if (ev1 < mddev->events)
782 return -EINVAL;
783 } else if (mddev->bitmap) {
784 /* if adding to array with a bitmap, then we can accept an
785 * older device ... but not too old.
786 */
787 __u64 ev1 = md_event(sb);
788 if (ev1 < mddev->bitmap->events_cleared)
789 return 0;
790 } else /* just a hot-add of a new device, leave raid_disk at -1 */
791 return 0;
792
793 if (mddev->level != LEVEL_MULTIPATH) {
794 desc = sb->disks + rdev->desc_nr;
795
796 if (desc->state & (1<<MD_DISK_FAULTY))
797 set_bit(Faulty, &rdev->flags);
798 else if (desc->state & (1<<MD_DISK_SYNC) &&
799 desc->raid_disk < mddev->raid_disks) {
800 set_bit(In_sync, &rdev->flags);
801 rdev->raid_disk = desc->raid_disk;
802 }
803 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
804 set_bit(WriteMostly, &rdev->flags);
805 } else /* MULTIPATH are always insync */
806 set_bit(In_sync, &rdev->flags);
807 return 0;
808 }
809
810 /*
811 * sync_super for 0.90.0
812 */
813 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
814 {
815 mdp_super_t *sb;
816 struct list_head *tmp;
817 mdk_rdev_t *rdev2;
818 int next_spare = mddev->raid_disks;
819
820
821 /* make rdev->sb match mddev data..
822 *
823 * 1/ zero out disks
824 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
825 * 3/ any empty disks < next_spare become removed
826 *
827 * disks[0] gets initialised to REMOVED because
828 * we cannot be sure from other fields if it has
829 * been initialised or not.
830 */
831 int i;
832 int active=0, working=0,failed=0,spare=0,nr_disks=0;
833
834 rdev->sb_size = MD_SB_BYTES;
835
836 sb = (mdp_super_t*)page_address(rdev->sb_page);
837
838 memset(sb, 0, sizeof(*sb));
839
840 sb->md_magic = MD_SB_MAGIC;
841 sb->major_version = mddev->major_version;
842 sb->minor_version = mddev->minor_version;
843 sb->patch_version = mddev->patch_version;
844 sb->gvalid_words = 0; /* ignored */
845 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
846 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
847 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
848 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
849
850 sb->ctime = mddev->ctime;
851 sb->level = mddev->level;
852 sb->size = mddev->size;
853 sb->raid_disks = mddev->raid_disks;
854 sb->md_minor = mddev->md_minor;
855 sb->not_persistent = !mddev->persistent;
856 sb->utime = mddev->utime;
857 sb->state = 0;
858 sb->events_hi = (mddev->events>>32);
859 sb->events_lo = (u32)mddev->events;
860
861 if (mddev->in_sync)
862 {
863 sb->recovery_cp = mddev->recovery_cp;
864 sb->cp_events_hi = (mddev->events>>32);
865 sb->cp_events_lo = (u32)mddev->events;
866 if (mddev->recovery_cp == MaxSector)
867 sb->state = (1<< MD_SB_CLEAN);
868 } else
869 sb->recovery_cp = 0;
870
871 sb->layout = mddev->layout;
872 sb->chunk_size = mddev->chunk_size;
873
874 if (mddev->bitmap && mddev->bitmap_file == NULL)
875 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
876
877 sb->disks[0].state = (1<<MD_DISK_REMOVED);
878 ITERATE_RDEV(mddev,rdev2,tmp) {
879 mdp_disk_t *d;
880 int desc_nr;
881 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
882 && !test_bit(Faulty, &rdev2->flags))
883 desc_nr = rdev2->raid_disk;
884 else
885 desc_nr = next_spare++;
886 rdev2->desc_nr = desc_nr;
887 d = &sb->disks[rdev2->desc_nr];
888 nr_disks++;
889 d->number = rdev2->desc_nr;
890 d->major = MAJOR(rdev2->bdev->bd_dev);
891 d->minor = MINOR(rdev2->bdev->bd_dev);
892 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
893 && !test_bit(Faulty, &rdev2->flags))
894 d->raid_disk = rdev2->raid_disk;
895 else
896 d->raid_disk = rdev2->desc_nr; /* compatibility */
897 if (test_bit(Faulty, &rdev2->flags)) {
898 d->state = (1<<MD_DISK_FAULTY);
899 failed++;
900 } else if (test_bit(In_sync, &rdev2->flags)) {
901 d->state = (1<<MD_DISK_ACTIVE);
902 d->state |= (1<<MD_DISK_SYNC);
903 active++;
904 working++;
905 } else {
906 d->state = 0;
907 spare++;
908 working++;
909 }
910 if (test_bit(WriteMostly, &rdev2->flags))
911 d->state |= (1<<MD_DISK_WRITEMOSTLY);
912 }
913 /* now set the "removed" and "faulty" bits on any missing devices */
914 for (i=0 ; i < mddev->raid_disks ; i++) {
915 mdp_disk_t *d = &sb->disks[i];
916 if (d->state == 0 && d->number == 0) {
917 d->number = i;
918 d->raid_disk = i;
919 d->state = (1<<MD_DISK_REMOVED);
920 d->state |= (1<<MD_DISK_FAULTY);
921 failed++;
922 }
923 }
924 sb->nr_disks = nr_disks;
925 sb->active_disks = active;
926 sb->working_disks = working;
927 sb->failed_disks = failed;
928 sb->spare_disks = spare;
929
930 sb->this_disk = sb->disks[rdev->desc_nr];
931 sb->sb_csum = calc_sb_csum(sb);
932 }
933
934 /*
935 * version 1 superblock
936 */
937
938 static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
939 {
940 unsigned int disk_csum, csum;
941 unsigned long long newcsum;
942 int size = 256 + le32_to_cpu(sb->max_dev)*2;
943 unsigned int *isuper = (unsigned int*)sb;
944 int i;
945
946 disk_csum = sb->sb_csum;
947 sb->sb_csum = 0;
948 newcsum = 0;
949 for (i=0; size>=4; size -= 4 )
950 newcsum += le32_to_cpu(*isuper++);
951
952 if (size == 2)
953 newcsum += le16_to_cpu(*(unsigned short*) isuper);
954
955 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
956 sb->sb_csum = disk_csum;
957 return cpu_to_le32(csum);
958 }
959
960 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
961 {
962 struct mdp_superblock_1 *sb;
963 int ret;
964 sector_t sb_offset;
965 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
966 int bmask;
967
968 /*
969 * Calculate the position of the superblock.
970 * It is always aligned to a 4K boundary and
971 * depeding on minor_version, it can be:
972 * 0: At least 8K, but less than 12K, from end of device
973 * 1: At start of device
974 * 2: 4K from start of device.
975 */
976 switch(minor_version) {
977 case 0:
978 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
979 sb_offset -= 8*2;
980 sb_offset &= ~(sector_t)(4*2-1);
981 /* convert from sectors to K */
982 sb_offset /= 2;
983 break;
984 case 1:
985 sb_offset = 0;
986 break;
987 case 2:
988 sb_offset = 4;
989 break;
990 default:
991 return -EINVAL;
992 }
993 rdev->sb_offset = sb_offset;
994
995 /* superblock is rarely larger than 1K, but it can be larger,
996 * and it is safe to read 4k, so we do that
997 */
998 ret = read_disk_sb(rdev, 4096);
999 if (ret) return ret;
1000
1001
1002 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1003
1004 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1005 sb->major_version != cpu_to_le32(1) ||
1006 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1007 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
1008 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1009 return -EINVAL;
1010
1011 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1012 printk("md: invalid superblock checksum on %s\n",
1013 bdevname(rdev->bdev,b));
1014 return -EINVAL;
1015 }
1016 if (le64_to_cpu(sb->data_size) < 10) {
1017 printk("md: data_size too small on %s\n",
1018 bdevname(rdev->bdev,b));
1019 return -EINVAL;
1020 }
1021 rdev->preferred_minor = 0xffff;
1022 rdev->data_offset = le64_to_cpu(sb->data_offset);
1023 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1024
1025 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1026 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1027 if (rdev->sb_size & bmask)
1028 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1029
1030 if (refdev == 0)
1031 ret = 1;
1032 else {
1033 __u64 ev1, ev2;
1034 struct mdp_superblock_1 *refsb =
1035 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1036
1037 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1038 sb->level != refsb->level ||
1039 sb->layout != refsb->layout ||
1040 sb->chunksize != refsb->chunksize) {
1041 printk(KERN_WARNING "md: %s has strangely different"
1042 " superblock to %s\n",
1043 bdevname(rdev->bdev,b),
1044 bdevname(refdev->bdev,b2));
1045 return -EINVAL;
1046 }
1047 ev1 = le64_to_cpu(sb->events);
1048 ev2 = le64_to_cpu(refsb->events);
1049
1050 if (ev1 > ev2)
1051 ret = 1;
1052 else
1053 ret = 0;
1054 }
1055 if (minor_version)
1056 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1057 else
1058 rdev->size = rdev->sb_offset;
1059 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1060 return -EINVAL;
1061 rdev->size = le64_to_cpu(sb->data_size)/2;
1062 if (le32_to_cpu(sb->chunksize))
1063 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1064
1065 if (le32_to_cpu(sb->size) > rdev->size*2)
1066 return -EINVAL;
1067 return ret;
1068 }
1069
1070 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1071 {
1072 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1073
1074 rdev->raid_disk = -1;
1075 rdev->flags = 0;
1076 if (mddev->raid_disks == 0) {
1077 mddev->major_version = 1;
1078 mddev->patch_version = 0;
1079 mddev->persistent = 1;
1080 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1081 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1082 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1083 mddev->level = le32_to_cpu(sb->level);
1084 mddev->clevel[0] = 0;
1085 mddev->layout = le32_to_cpu(sb->layout);
1086 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1087 mddev->size = le64_to_cpu(sb->size)/2;
1088 mddev->events = le64_to_cpu(sb->events);
1089 mddev->bitmap_offset = 0;
1090 mddev->default_bitmap_offset = 1024 >> 9;
1091
1092 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1093 memcpy(mddev->uuid, sb->set_uuid, 16);
1094
1095 mddev->max_disks = (4096-256)/2;
1096
1097 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1098 mddev->bitmap_file == NULL ) {
1099 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
1100 && mddev->level != 10) {
1101 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
1102 return -EINVAL;
1103 }
1104 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1105 }
1106 } else if (mddev->pers == NULL) {
1107 /* Insist of good event counter while assembling */
1108 __u64 ev1 = le64_to_cpu(sb->events);
1109 ++ev1;
1110 if (ev1 < mddev->events)
1111 return -EINVAL;
1112 } else if (mddev->bitmap) {
1113 /* If adding to array with a bitmap, then we can accept an
1114 * older device, but not too old.
1115 */
1116 __u64 ev1 = le64_to_cpu(sb->events);
1117 if (ev1 < mddev->bitmap->events_cleared)
1118 return 0;
1119 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1120 return 0;
1121
1122 if (mddev->level != LEVEL_MULTIPATH) {
1123 int role;
1124 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1125 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1126 switch(role) {
1127 case 0xffff: /* spare */
1128 break;
1129 case 0xfffe: /* faulty */
1130 set_bit(Faulty, &rdev->flags);
1131 break;
1132 default:
1133 set_bit(In_sync, &rdev->flags);
1134 rdev->raid_disk = role;
1135 break;
1136 }
1137 if (sb->devflags & WriteMostly1)
1138 set_bit(WriteMostly, &rdev->flags);
1139 } else /* MULTIPATH are always insync */
1140 set_bit(In_sync, &rdev->flags);
1141
1142 return 0;
1143 }
1144
1145 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1146 {
1147 struct mdp_superblock_1 *sb;
1148 struct list_head *tmp;
1149 mdk_rdev_t *rdev2;
1150 int max_dev, i;
1151 /* make rdev->sb match mddev and rdev data. */
1152
1153 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1154
1155 sb->feature_map = 0;
1156 sb->pad0 = 0;
1157 memset(sb->pad1, 0, sizeof(sb->pad1));
1158 memset(sb->pad2, 0, sizeof(sb->pad2));
1159 memset(sb->pad3, 0, sizeof(sb->pad3));
1160
1161 sb->utime = cpu_to_le64((__u64)mddev->utime);
1162 sb->events = cpu_to_le64(mddev->events);
1163 if (mddev->in_sync)
1164 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1165 else
1166 sb->resync_offset = cpu_to_le64(0);
1167
1168 sb->cnt_corrected_read = atomic_read(&rdev->corrected_errors);
1169
1170 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1171 sb->size = cpu_to_le64(mddev->size<<1);
1172
1173 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1174 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1175 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1176 }
1177
1178 max_dev = 0;
1179 ITERATE_RDEV(mddev,rdev2,tmp)
1180 if (rdev2->desc_nr+1 > max_dev)
1181 max_dev = rdev2->desc_nr+1;
1182
1183 sb->max_dev = cpu_to_le32(max_dev);
1184 for (i=0; i<max_dev;i++)
1185 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1186
1187 ITERATE_RDEV(mddev,rdev2,tmp) {
1188 i = rdev2->desc_nr;
1189 if (test_bit(Faulty, &rdev2->flags))
1190 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1191 else if (test_bit(In_sync, &rdev2->flags))
1192 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1193 else
1194 sb->dev_roles[i] = cpu_to_le16(0xffff);
1195 }
1196
1197 sb->recovery_offset = cpu_to_le64(0); /* not supported yet */
1198 sb->sb_csum = calc_sb_1_csum(sb);
1199 }
1200
1201
1202 static struct super_type super_types[] = {
1203 [0] = {
1204 .name = "0.90.0",
1205 .owner = THIS_MODULE,
1206 .load_super = super_90_load,
1207 .validate_super = super_90_validate,
1208 .sync_super = super_90_sync,
1209 },
1210 [1] = {
1211 .name = "md-1",
1212 .owner = THIS_MODULE,
1213 .load_super = super_1_load,
1214 .validate_super = super_1_validate,
1215 .sync_super = super_1_sync,
1216 },
1217 };
1218
1219 static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1220 {
1221 struct list_head *tmp;
1222 mdk_rdev_t *rdev;
1223
1224 ITERATE_RDEV(mddev,rdev,tmp)
1225 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1226 return rdev;
1227
1228 return NULL;
1229 }
1230
1231 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1232 {
1233 struct list_head *tmp;
1234 mdk_rdev_t *rdev;
1235
1236 ITERATE_RDEV(mddev1,rdev,tmp)
1237 if (match_dev_unit(mddev2, rdev))
1238 return 1;
1239
1240 return 0;
1241 }
1242
1243 static LIST_HEAD(pending_raid_disks);
1244
1245 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1246 {
1247 mdk_rdev_t *same_pdev;
1248 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1249 struct kobject *ko;
1250 char *s;
1251
1252 if (rdev->mddev) {
1253 MD_BUG();
1254 return -EINVAL;
1255 }
1256 /* make sure rdev->size exceeds mddev->size */
1257 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1258 if (mddev->pers)
1259 /* Cannot change size, so fail */
1260 return -ENOSPC;
1261 else
1262 mddev->size = rdev->size;
1263 }
1264 same_pdev = match_dev_unit(mddev, rdev);
1265 if (same_pdev)
1266 printk(KERN_WARNING
1267 "%s: WARNING: %s appears to be on the same physical"
1268 " disk as %s. True\n protection against single-disk"
1269 " failure might be compromised.\n",
1270 mdname(mddev), bdevname(rdev->bdev,b),
1271 bdevname(same_pdev->bdev,b2));
1272
1273 /* Verify rdev->desc_nr is unique.
1274 * If it is -1, assign a free number, else
1275 * check number is not in use
1276 */
1277 if (rdev->desc_nr < 0) {
1278 int choice = 0;
1279 if (mddev->pers) choice = mddev->raid_disks;
1280 while (find_rdev_nr(mddev, choice))
1281 choice++;
1282 rdev->desc_nr = choice;
1283 } else {
1284 if (find_rdev_nr(mddev, rdev->desc_nr))
1285 return -EBUSY;
1286 }
1287 bdevname(rdev->bdev,b);
1288 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1289 return -ENOMEM;
1290 while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
1291 *s = '!';
1292
1293 list_add(&rdev->same_set, &mddev->disks);
1294 rdev->mddev = mddev;
1295 printk(KERN_INFO "md: bind<%s>\n", b);
1296
1297 rdev->kobj.parent = &mddev->kobj;
1298 kobject_add(&rdev->kobj);
1299
1300 if (rdev->bdev->bd_part)
1301 ko = &rdev->bdev->bd_part->kobj;
1302 else
1303 ko = &rdev->bdev->bd_disk->kobj;
1304 sysfs_create_link(&rdev->kobj, ko, "block");
1305 bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
1306 return 0;
1307 }
1308
1309 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1310 {
1311 char b[BDEVNAME_SIZE];
1312 if (!rdev->mddev) {
1313 MD_BUG();
1314 return;
1315 }
1316 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1317 list_del_init(&rdev->same_set);
1318 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1319 rdev->mddev = NULL;
1320 sysfs_remove_link(&rdev->kobj, "block");
1321 kobject_del(&rdev->kobj);
1322 }
1323
1324 /*
1325 * prevent the device from being mounted, repartitioned or
1326 * otherwise reused by a RAID array (or any other kernel
1327 * subsystem), by bd_claiming the device.
1328 */
1329 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1330 {
1331 int err = 0;
1332 struct block_device *bdev;
1333 char b[BDEVNAME_SIZE];
1334
1335 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1336 if (IS_ERR(bdev)) {
1337 printk(KERN_ERR "md: could not open %s.\n",
1338 __bdevname(dev, b));
1339 return PTR_ERR(bdev);
1340 }
1341 err = bd_claim(bdev, rdev);
1342 if (err) {
1343 printk(KERN_ERR "md: could not bd_claim %s.\n",
1344 bdevname(bdev, b));
1345 blkdev_put(bdev);
1346 return err;
1347 }
1348 rdev->bdev = bdev;
1349 return err;
1350 }
1351
1352 static void unlock_rdev(mdk_rdev_t *rdev)
1353 {
1354 struct block_device *bdev = rdev->bdev;
1355 rdev->bdev = NULL;
1356 if (!bdev)
1357 MD_BUG();
1358 bd_release(bdev);
1359 blkdev_put(bdev);
1360 }
1361
1362 void md_autodetect_dev(dev_t dev);
1363
1364 static void export_rdev(mdk_rdev_t * rdev)
1365 {
1366 char b[BDEVNAME_SIZE];
1367 printk(KERN_INFO "md: export_rdev(%s)\n",
1368 bdevname(rdev->bdev,b));
1369 if (rdev->mddev)
1370 MD_BUG();
1371 free_disk_sb(rdev);
1372 list_del_init(&rdev->same_set);
1373 #ifndef MODULE
1374 md_autodetect_dev(rdev->bdev->bd_dev);
1375 #endif
1376 unlock_rdev(rdev);
1377 kobject_put(&rdev->kobj);
1378 }
1379
1380 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1381 {
1382 unbind_rdev_from_array(rdev);
1383 export_rdev(rdev);
1384 }
1385
1386 static void export_array(mddev_t *mddev)
1387 {
1388 struct list_head *tmp;
1389 mdk_rdev_t *rdev;
1390
1391 ITERATE_RDEV(mddev,rdev,tmp) {
1392 if (!rdev->mddev) {
1393 MD_BUG();
1394 continue;
1395 }
1396 kick_rdev_from_array(rdev);
1397 }
1398 if (!list_empty(&mddev->disks))
1399 MD_BUG();
1400 mddev->raid_disks = 0;
1401 mddev->major_version = 0;
1402 }
1403
1404 static void print_desc(mdp_disk_t *desc)
1405 {
1406 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1407 desc->major,desc->minor,desc->raid_disk,desc->state);
1408 }
1409
1410 static void print_sb(mdp_super_t *sb)
1411 {
1412 int i;
1413
1414 printk(KERN_INFO
1415 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1416 sb->major_version, sb->minor_version, sb->patch_version,
1417 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1418 sb->ctime);
1419 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1420 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1421 sb->md_minor, sb->layout, sb->chunk_size);
1422 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1423 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1424 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1425 sb->failed_disks, sb->spare_disks,
1426 sb->sb_csum, (unsigned long)sb->events_lo);
1427
1428 printk(KERN_INFO);
1429 for (i = 0; i < MD_SB_DISKS; i++) {
1430 mdp_disk_t *desc;
1431
1432 desc = sb->disks + i;
1433 if (desc->number || desc->major || desc->minor ||
1434 desc->raid_disk || (desc->state && (desc->state != 4))) {
1435 printk(" D %2d: ", i);
1436 print_desc(desc);
1437 }
1438 }
1439 printk(KERN_INFO "md: THIS: ");
1440 print_desc(&sb->this_disk);
1441
1442 }
1443
1444 static void print_rdev(mdk_rdev_t *rdev)
1445 {
1446 char b[BDEVNAME_SIZE];
1447 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1448 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1449 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1450 rdev->desc_nr);
1451 if (rdev->sb_loaded) {
1452 printk(KERN_INFO "md: rdev superblock:\n");
1453 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1454 } else
1455 printk(KERN_INFO "md: no rdev superblock!\n");
1456 }
1457
1458 void md_print_devices(void)
1459 {
1460 struct list_head *tmp, *tmp2;
1461 mdk_rdev_t *rdev;
1462 mddev_t *mddev;
1463 char b[BDEVNAME_SIZE];
1464
1465 printk("\n");
1466 printk("md: **********************************\n");
1467 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1468 printk("md: **********************************\n");
1469 ITERATE_MDDEV(mddev,tmp) {
1470
1471 if (mddev->bitmap)
1472 bitmap_print_sb(mddev->bitmap);
1473 else
1474 printk("%s: ", mdname(mddev));
1475 ITERATE_RDEV(mddev,rdev,tmp2)
1476 printk("<%s>", bdevname(rdev->bdev,b));
1477 printk("\n");
1478
1479 ITERATE_RDEV(mddev,rdev,tmp2)
1480 print_rdev(rdev);
1481 }
1482 printk("md: **********************************\n");
1483 printk("\n");
1484 }
1485
1486
1487 static void sync_sbs(mddev_t * mddev)
1488 {
1489 mdk_rdev_t *rdev;
1490 struct list_head *tmp;
1491
1492 ITERATE_RDEV(mddev,rdev,tmp) {
1493 super_types[mddev->major_version].
1494 sync_super(mddev, rdev);
1495 rdev->sb_loaded = 1;
1496 }
1497 }
1498
1499 static void md_update_sb(mddev_t * mddev)
1500 {
1501 int err;
1502 struct list_head *tmp;
1503 mdk_rdev_t *rdev;
1504 int sync_req;
1505
1506 repeat:
1507 spin_lock_irq(&mddev->write_lock);
1508 sync_req = mddev->in_sync;
1509 mddev->utime = get_seconds();
1510 mddev->events ++;
1511
1512 if (!mddev->events) {
1513 /*
1514 * oops, this 64-bit counter should never wrap.
1515 * Either we are in around ~1 trillion A.C., assuming
1516 * 1 reboot per second, or we have a bug:
1517 */
1518 MD_BUG();
1519 mddev->events --;
1520 }
1521 mddev->sb_dirty = 2;
1522 sync_sbs(mddev);
1523
1524 /*
1525 * do not write anything to disk if using
1526 * nonpersistent superblocks
1527 */
1528 if (!mddev->persistent) {
1529 mddev->sb_dirty = 0;
1530 spin_unlock_irq(&mddev->write_lock);
1531 wake_up(&mddev->sb_wait);
1532 return;
1533 }
1534 spin_unlock_irq(&mddev->write_lock);
1535
1536 dprintk(KERN_INFO
1537 "md: updating %s RAID superblock on device (in sync %d)\n",
1538 mdname(mddev),mddev->in_sync);
1539
1540 err = bitmap_update_sb(mddev->bitmap);
1541 ITERATE_RDEV(mddev,rdev,tmp) {
1542 char b[BDEVNAME_SIZE];
1543 dprintk(KERN_INFO "md: ");
1544 if (test_bit(Faulty, &rdev->flags))
1545 dprintk("(skipping faulty ");
1546
1547 dprintk("%s ", bdevname(rdev->bdev,b));
1548 if (!test_bit(Faulty, &rdev->flags)) {
1549 md_super_write(mddev,rdev,
1550 rdev->sb_offset<<1, rdev->sb_size,
1551 rdev->sb_page);
1552 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1553 bdevname(rdev->bdev,b),
1554 (unsigned long long)rdev->sb_offset);
1555
1556 } else
1557 dprintk(")\n");
1558 if (mddev->level == LEVEL_MULTIPATH)
1559 /* only need to write one superblock... */
1560 break;
1561 }
1562 md_super_wait(mddev);
1563 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1564
1565 spin_lock_irq(&mddev->write_lock);
1566 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
1567 /* have to write it out again */
1568 spin_unlock_irq(&mddev->write_lock);
1569 goto repeat;
1570 }
1571 mddev->sb_dirty = 0;
1572 spin_unlock_irq(&mddev->write_lock);
1573 wake_up(&mddev->sb_wait);
1574
1575 }
1576
1577 /* words written to sysfs files may, or my not, be \n terminated.
1578 * We want to accept with case. For this we use cmd_match.
1579 */
1580 static int cmd_match(const char *cmd, const char *str)
1581 {
1582 /* See if cmd, written into a sysfs file, matches
1583 * str. They must either be the same, or cmd can
1584 * have a trailing newline
1585 */
1586 while (*cmd && *str && *cmd == *str) {
1587 cmd++;
1588 str++;
1589 }
1590 if (*cmd == '\n')
1591 cmd++;
1592 if (*str || *cmd)
1593 return 0;
1594 return 1;
1595 }
1596
1597 struct rdev_sysfs_entry {
1598 struct attribute attr;
1599 ssize_t (*show)(mdk_rdev_t *, char *);
1600 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1601 };
1602
1603 static ssize_t
1604 state_show(mdk_rdev_t *rdev, char *page)
1605 {
1606 char *sep = "";
1607 int len=0;
1608
1609 if (test_bit(Faulty, &rdev->flags)) {
1610 len+= sprintf(page+len, "%sfaulty",sep);
1611 sep = ",";
1612 }
1613 if (test_bit(In_sync, &rdev->flags)) {
1614 len += sprintf(page+len, "%sin_sync",sep);
1615 sep = ",";
1616 }
1617 if (!test_bit(Faulty, &rdev->flags) &&
1618 !test_bit(In_sync, &rdev->flags)) {
1619 len += sprintf(page+len, "%sspare", sep);
1620 sep = ",";
1621 }
1622 return len+sprintf(page+len, "\n");
1623 }
1624
1625 static struct rdev_sysfs_entry
1626 rdev_state = __ATTR_RO(state);
1627
1628 static ssize_t
1629 super_show(mdk_rdev_t *rdev, char *page)
1630 {
1631 if (rdev->sb_loaded && rdev->sb_size) {
1632 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1633 return rdev->sb_size;
1634 } else
1635 return 0;
1636 }
1637 static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1638
1639 static ssize_t
1640 errors_show(mdk_rdev_t *rdev, char *page)
1641 {
1642 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1643 }
1644
1645 static ssize_t
1646 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1647 {
1648 char *e;
1649 unsigned long n = simple_strtoul(buf, &e, 10);
1650 if (*buf && (*e == 0 || *e == '\n')) {
1651 atomic_set(&rdev->corrected_errors, n);
1652 return len;
1653 }
1654 return -EINVAL;
1655 }
1656 static struct rdev_sysfs_entry rdev_errors =
1657 __ATTR(errors, 0644, errors_show, errors_store);
1658
1659 static ssize_t
1660 slot_show(mdk_rdev_t *rdev, char *page)
1661 {
1662 if (rdev->raid_disk < 0)
1663 return sprintf(page, "none\n");
1664 else
1665 return sprintf(page, "%d\n", rdev->raid_disk);
1666 }
1667
1668 static ssize_t
1669 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1670 {
1671 char *e;
1672 int slot = simple_strtoul(buf, &e, 10);
1673 if (strncmp(buf, "none", 4)==0)
1674 slot = -1;
1675 else if (e==buf || (*e && *e!= '\n'))
1676 return -EINVAL;
1677 if (rdev->mddev->pers)
1678 /* Cannot set slot in active array (yet) */
1679 return -EBUSY;
1680 if (slot >= rdev->mddev->raid_disks)
1681 return -ENOSPC;
1682 rdev->raid_disk = slot;
1683 /* assume it is working */
1684 rdev->flags = 0;
1685 set_bit(In_sync, &rdev->flags);
1686 return len;
1687 }
1688
1689
1690 static struct rdev_sysfs_entry rdev_slot =
1691 __ATTR(slot, 0644, slot_show, slot_store);
1692
1693 static ssize_t
1694 offset_show(mdk_rdev_t *rdev, char *page)
1695 {
1696 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
1697 }
1698
1699 static ssize_t
1700 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1701 {
1702 char *e;
1703 unsigned long long offset = simple_strtoull(buf, &e, 10);
1704 if (e==buf || (*e && *e != '\n'))
1705 return -EINVAL;
1706 if (rdev->mddev->pers)
1707 return -EBUSY;
1708 rdev->data_offset = offset;
1709 return len;
1710 }
1711
1712 static struct rdev_sysfs_entry rdev_offset =
1713 __ATTR(offset, 0644, offset_show, offset_store);
1714
1715 static ssize_t
1716 rdev_size_show(mdk_rdev_t *rdev, char *page)
1717 {
1718 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1719 }
1720
1721 static ssize_t
1722 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1723 {
1724 char *e;
1725 unsigned long long size = simple_strtoull(buf, &e, 10);
1726 if (e==buf || (*e && *e != '\n'))
1727 return -EINVAL;
1728 if (rdev->mddev->pers)
1729 return -EBUSY;
1730 rdev->size = size;
1731 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1732 rdev->mddev->size = size;
1733 return len;
1734 }
1735
1736 static struct rdev_sysfs_entry rdev_size =
1737 __ATTR(size, 0644, rdev_size_show, rdev_size_store);
1738
1739 static struct attribute *rdev_default_attrs[] = {
1740 &rdev_state.attr,
1741 &rdev_super.attr,
1742 &rdev_errors.attr,
1743 &rdev_slot.attr,
1744 &rdev_offset.attr,
1745 &rdev_size.attr,
1746 NULL,
1747 };
1748 static ssize_t
1749 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1750 {
1751 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1752 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1753
1754 if (!entry->show)
1755 return -EIO;
1756 return entry->show(rdev, page);
1757 }
1758
1759 static ssize_t
1760 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1761 const char *page, size_t length)
1762 {
1763 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1764 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1765
1766 if (!entry->store)
1767 return -EIO;
1768 return entry->store(rdev, page, length);
1769 }
1770
1771 static void rdev_free(struct kobject *ko)
1772 {
1773 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1774 kfree(rdev);
1775 }
1776 static struct sysfs_ops rdev_sysfs_ops = {
1777 .show = rdev_attr_show,
1778 .store = rdev_attr_store,
1779 };
1780 static struct kobj_type rdev_ktype = {
1781 .release = rdev_free,
1782 .sysfs_ops = &rdev_sysfs_ops,
1783 .default_attrs = rdev_default_attrs,
1784 };
1785
1786 /*
1787 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1788 *
1789 * mark the device faulty if:
1790 *
1791 * - the device is nonexistent (zero size)
1792 * - the device has no valid superblock
1793 *
1794 * a faulty rdev _never_ has rdev->sb set.
1795 */
1796 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1797 {
1798 char b[BDEVNAME_SIZE];
1799 int err;
1800 mdk_rdev_t *rdev;
1801 sector_t size;
1802
1803 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1804 if (!rdev) {
1805 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1806 return ERR_PTR(-ENOMEM);
1807 }
1808
1809 if ((err = alloc_disk_sb(rdev)))
1810 goto abort_free;
1811
1812 err = lock_rdev(rdev, newdev);
1813 if (err)
1814 goto abort_free;
1815
1816 rdev->kobj.parent = NULL;
1817 rdev->kobj.ktype = &rdev_ktype;
1818 kobject_init(&rdev->kobj);
1819
1820 rdev->desc_nr = -1;
1821 rdev->flags = 0;
1822 rdev->data_offset = 0;
1823 atomic_set(&rdev->nr_pending, 0);
1824 atomic_set(&rdev->read_errors, 0);
1825 atomic_set(&rdev->corrected_errors, 0);
1826
1827 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
1828 if (!size) {
1829 printk(KERN_WARNING
1830 "md: %s has zero or unknown size, marking faulty!\n",
1831 bdevname(rdev->bdev,b));
1832 err = -EINVAL;
1833 goto abort_free;
1834 }
1835
1836 if (super_format >= 0) {
1837 err = super_types[super_format].
1838 load_super(rdev, NULL, super_minor);
1839 if (err == -EINVAL) {
1840 printk(KERN_WARNING
1841 "md: %s has invalid sb, not importing!\n",
1842 bdevname(rdev->bdev,b));
1843 goto abort_free;
1844 }
1845 if (err < 0) {
1846 printk(KERN_WARNING
1847 "md: could not read %s's sb, not importing!\n",
1848 bdevname(rdev->bdev,b));
1849 goto abort_free;
1850 }
1851 }
1852 INIT_LIST_HEAD(&rdev->same_set);
1853
1854 return rdev;
1855
1856 abort_free:
1857 if (rdev->sb_page) {
1858 if (rdev->bdev)
1859 unlock_rdev(rdev);
1860 free_disk_sb(rdev);
1861 }
1862 kfree(rdev);
1863 return ERR_PTR(err);
1864 }
1865
1866 /*
1867 * Check a full RAID array for plausibility
1868 */
1869
1870
1871 static void analyze_sbs(mddev_t * mddev)
1872 {
1873 int i;
1874 struct list_head *tmp;
1875 mdk_rdev_t *rdev, *freshest;
1876 char b[BDEVNAME_SIZE];
1877
1878 freshest = NULL;
1879 ITERATE_RDEV(mddev,rdev,tmp)
1880 switch (super_types[mddev->major_version].
1881 load_super(rdev, freshest, mddev->minor_version)) {
1882 case 1:
1883 freshest = rdev;
1884 break;
1885 case 0:
1886 break;
1887 default:
1888 printk( KERN_ERR \
1889 "md: fatal superblock inconsistency in %s"
1890 " -- removing from array\n",
1891 bdevname(rdev->bdev,b));
1892 kick_rdev_from_array(rdev);
1893 }
1894
1895
1896 super_types[mddev->major_version].
1897 validate_super(mddev, freshest);
1898
1899 i = 0;
1900 ITERATE_RDEV(mddev,rdev,tmp) {
1901 if (rdev != freshest)
1902 if (super_types[mddev->major_version].
1903 validate_super(mddev, rdev)) {
1904 printk(KERN_WARNING "md: kicking non-fresh %s"
1905 " from array!\n",
1906 bdevname(rdev->bdev,b));
1907 kick_rdev_from_array(rdev);
1908 continue;
1909 }
1910 if (mddev->level == LEVEL_MULTIPATH) {
1911 rdev->desc_nr = i++;
1912 rdev->raid_disk = rdev->desc_nr;
1913 set_bit(In_sync, &rdev->flags);
1914 }
1915 }
1916
1917
1918
1919 if (mddev->recovery_cp != MaxSector &&
1920 mddev->level >= 1)
1921 printk(KERN_ERR "md: %s: raid array is not clean"
1922 " -- starting background reconstruction\n",
1923 mdname(mddev));
1924
1925 }
1926
1927 static ssize_t
1928 level_show(mddev_t *mddev, char *page)
1929 {
1930 struct mdk_personality *p = mddev->pers;
1931 if (p)
1932 return sprintf(page, "%s\n", p->name);
1933 else if (mddev->clevel[0])
1934 return sprintf(page, "%s\n", mddev->clevel);
1935 else if (mddev->level != LEVEL_NONE)
1936 return sprintf(page, "%d\n", mddev->level);
1937 else
1938 return 0;
1939 }
1940
1941 static ssize_t
1942 level_store(mddev_t *mddev, const char *buf, size_t len)
1943 {
1944 int rv = len;
1945 if (mddev->pers)
1946 return -EBUSY;
1947 if (len == 0)
1948 return 0;
1949 if (len >= sizeof(mddev->clevel))
1950 return -ENOSPC;
1951 strncpy(mddev->clevel, buf, len);
1952 if (mddev->clevel[len-1] == '\n')
1953 len--;
1954 mddev->clevel[len] = 0;
1955 mddev->level = LEVEL_NONE;
1956 return rv;
1957 }
1958
1959 static struct md_sysfs_entry md_level =
1960 __ATTR(level, 0644, level_show, level_store);
1961
1962 static ssize_t
1963 raid_disks_show(mddev_t *mddev, char *page)
1964 {
1965 if (mddev->raid_disks == 0)
1966 return 0;
1967 return sprintf(page, "%d\n", mddev->raid_disks);
1968 }
1969
1970 static int update_raid_disks(mddev_t *mddev, int raid_disks);
1971
1972 static ssize_t
1973 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
1974 {
1975 /* can only set raid_disks if array is not yet active */
1976 char *e;
1977 int rv = 0;
1978 unsigned long n = simple_strtoul(buf, &e, 10);
1979
1980 if (!*buf || (*e && *e != '\n'))
1981 return -EINVAL;
1982
1983 if (mddev->pers)
1984 rv = update_raid_disks(mddev, n);
1985 else
1986 mddev->raid_disks = n;
1987 return rv ? rv : len;
1988 }
1989 static struct md_sysfs_entry md_raid_disks =
1990 __ATTR(raid_disks, 0644, raid_disks_show, raid_disks_store);
1991
1992 static ssize_t
1993 chunk_size_show(mddev_t *mddev, char *page)
1994 {
1995 return sprintf(page, "%d\n", mddev->chunk_size);
1996 }
1997
1998 static ssize_t
1999 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2000 {
2001 /* can only set chunk_size if array is not yet active */
2002 char *e;
2003 unsigned long n = simple_strtoul(buf, &e, 10);
2004
2005 if (mddev->pers)
2006 return -EBUSY;
2007 if (!*buf || (*e && *e != '\n'))
2008 return -EINVAL;
2009
2010 mddev->chunk_size = n;
2011 return len;
2012 }
2013 static struct md_sysfs_entry md_chunk_size =
2014 __ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
2015
2016 static ssize_t
2017 null_show(mddev_t *mddev, char *page)
2018 {
2019 return -EINVAL;
2020 }
2021
2022 static ssize_t
2023 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2024 {
2025 /* buf must be %d:%d\n? giving major and minor numbers */
2026 /* The new device is added to the array.
2027 * If the array has a persistent superblock, we read the
2028 * superblock to initialise info and check validity.
2029 * Otherwise, only checking done is that in bind_rdev_to_array,
2030 * which mainly checks size.
2031 */
2032 char *e;
2033 int major = simple_strtoul(buf, &e, 10);
2034 int minor;
2035 dev_t dev;
2036 mdk_rdev_t *rdev;
2037 int err;
2038
2039 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2040 return -EINVAL;
2041 minor = simple_strtoul(e+1, &e, 10);
2042 if (*e && *e != '\n')
2043 return -EINVAL;
2044 dev = MKDEV(major, minor);
2045 if (major != MAJOR(dev) ||
2046 minor != MINOR(dev))
2047 return -EOVERFLOW;
2048
2049
2050 if (mddev->persistent) {
2051 rdev = md_import_device(dev, mddev->major_version,
2052 mddev->minor_version);
2053 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2054 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2055 mdk_rdev_t, same_set);
2056 err = super_types[mddev->major_version]
2057 .load_super(rdev, rdev0, mddev->minor_version);
2058 if (err < 0)
2059 goto out;
2060 }
2061 } else
2062 rdev = md_import_device(dev, -1, -1);
2063
2064 if (IS_ERR(rdev))
2065 return PTR_ERR(rdev);
2066 err = bind_rdev_to_array(rdev, mddev);
2067 out:
2068 if (err)
2069 export_rdev(rdev);
2070 return err ? err : len;
2071 }
2072
2073 static struct md_sysfs_entry md_new_device =
2074 __ATTR(new_dev, 0200, null_show, new_dev_store);
2075
2076 static ssize_t
2077 size_show(mddev_t *mddev, char *page)
2078 {
2079 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2080 }
2081
2082 static int update_size(mddev_t *mddev, unsigned long size);
2083
2084 static ssize_t
2085 size_store(mddev_t *mddev, const char *buf, size_t len)
2086 {
2087 /* If array is inactive, we can reduce the component size, but
2088 * not increase it (except from 0).
2089 * If array is active, we can try an on-line resize
2090 */
2091 char *e;
2092 int err = 0;
2093 unsigned long long size = simple_strtoull(buf, &e, 10);
2094 if (!*buf || *buf == '\n' ||
2095 (*e && *e != '\n'))
2096 return -EINVAL;
2097
2098 if (mddev->pers) {
2099 err = update_size(mddev, size);
2100 md_update_sb(mddev);
2101 } else {
2102 if (mddev->size == 0 ||
2103 mddev->size > size)
2104 mddev->size = size;
2105 else
2106 err = -ENOSPC;
2107 }
2108 return err ? err : len;
2109 }
2110
2111 static struct md_sysfs_entry md_size =
2112 __ATTR(component_size, 0644, size_show, size_store);
2113
2114
2115 /* Metdata version.
2116 * This is either 'none' for arrays with externally managed metadata,
2117 * or N.M for internally known formats
2118 */
2119 static ssize_t
2120 metadata_show(mddev_t *mddev, char *page)
2121 {
2122 if (mddev->persistent)
2123 return sprintf(page, "%d.%d\n",
2124 mddev->major_version, mddev->minor_version);
2125 else
2126 return sprintf(page, "none\n");
2127 }
2128
2129 static ssize_t
2130 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2131 {
2132 int major, minor;
2133 char *e;
2134 if (!list_empty(&mddev->disks))
2135 return -EBUSY;
2136
2137 if (cmd_match(buf, "none")) {
2138 mddev->persistent = 0;
2139 mddev->major_version = 0;
2140 mddev->minor_version = 90;
2141 return len;
2142 }
2143 major = simple_strtoul(buf, &e, 10);
2144 if (e==buf || *e != '.')
2145 return -EINVAL;
2146 buf = e+1;
2147 minor = simple_strtoul(buf, &e, 10);
2148 if (e==buf || *e != '\n')
2149 return -EINVAL;
2150 if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
2151 super_types[major].name == NULL)
2152 return -ENOENT;
2153 mddev->major_version = major;
2154 mddev->minor_version = minor;
2155 mddev->persistent = 1;
2156 return len;
2157 }
2158
2159 static struct md_sysfs_entry md_metadata =
2160 __ATTR(metadata_version, 0644, metadata_show, metadata_store);
2161
2162 static ssize_t
2163 action_show(mddev_t *mddev, char *page)
2164 {
2165 char *type = "idle";
2166 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2167 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
2168 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2169 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2170 type = "resync";
2171 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2172 type = "check";
2173 else
2174 type = "repair";
2175 } else
2176 type = "recover";
2177 }
2178 return sprintf(page, "%s\n", type);
2179 }
2180
2181 static ssize_t
2182 action_store(mddev_t *mddev, const char *page, size_t len)
2183 {
2184 if (!mddev->pers || !mddev->pers->sync_request)
2185 return -EINVAL;
2186
2187 if (cmd_match(page, "idle")) {
2188 if (mddev->sync_thread) {
2189 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2190 md_unregister_thread(mddev->sync_thread);
2191 mddev->sync_thread = NULL;
2192 mddev->recovery = 0;
2193 }
2194 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2195 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
2196 return -EBUSY;
2197 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
2198 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2199 else {
2200 if (cmd_match(page, "check"))
2201 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2202 else if (cmd_match(page, "repair"))
2203 return -EINVAL;
2204 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2205 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
2206 }
2207 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2208 md_wakeup_thread(mddev->thread);
2209 return len;
2210 }
2211
2212 static ssize_t
2213 mismatch_cnt_show(mddev_t *mddev, char *page)
2214 {
2215 return sprintf(page, "%llu\n",
2216 (unsigned long long) mddev->resync_mismatches);
2217 }
2218
2219 static struct md_sysfs_entry
2220 md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
2221
2222
2223 static struct md_sysfs_entry
2224 md_mismatches = __ATTR_RO(mismatch_cnt);
2225
2226 static ssize_t
2227 sync_min_show(mddev_t *mddev, char *page)
2228 {
2229 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2230 mddev->sync_speed_min ? "local": "system");
2231 }
2232
2233 static ssize_t
2234 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2235 {
2236 int min;
2237 char *e;
2238 if (strncmp(buf, "system", 6)==0) {
2239 mddev->sync_speed_min = 0;
2240 return len;
2241 }
2242 min = simple_strtoul(buf, &e, 10);
2243 if (buf == e || (*e && *e != '\n') || min <= 0)
2244 return -EINVAL;
2245 mddev->sync_speed_min = min;
2246 return len;
2247 }
2248
2249 static struct md_sysfs_entry md_sync_min =
2250 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2251
2252 static ssize_t
2253 sync_max_show(mddev_t *mddev, char *page)
2254 {
2255 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2256 mddev->sync_speed_max ? "local": "system");
2257 }
2258
2259 static ssize_t
2260 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2261 {
2262 int max;
2263 char *e;
2264 if (strncmp(buf, "system", 6)==0) {
2265 mddev->sync_speed_max = 0;
2266 return len;
2267 }
2268 max = simple_strtoul(buf, &e, 10);
2269 if (buf == e || (*e && *e != '\n') || max <= 0)
2270 return -EINVAL;
2271 mddev->sync_speed_max = max;
2272 return len;
2273 }
2274
2275 static struct md_sysfs_entry md_sync_max =
2276 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2277
2278
2279 static ssize_t
2280 sync_speed_show(mddev_t *mddev, char *page)
2281 {
2282 unsigned long resync, dt, db;
2283 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2284 dt = ((jiffies - mddev->resync_mark) / HZ);
2285 if (!dt) dt++;
2286 db = resync - (mddev->resync_mark_cnt);
2287 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2288 }
2289
2290 static struct md_sysfs_entry
2291 md_sync_speed = __ATTR_RO(sync_speed);
2292
2293 static ssize_t
2294 sync_completed_show(mddev_t *mddev, char *page)
2295 {
2296 unsigned long max_blocks, resync;
2297
2298 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2299 max_blocks = mddev->resync_max_sectors;
2300 else
2301 max_blocks = mddev->size << 1;
2302
2303 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2304 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2305 }
2306
2307 static struct md_sysfs_entry
2308 md_sync_completed = __ATTR_RO(sync_completed);
2309
2310 static struct attribute *md_default_attrs[] = {
2311 &md_level.attr,
2312 &md_raid_disks.attr,
2313 &md_chunk_size.attr,
2314 &md_size.attr,
2315 &md_metadata.attr,
2316 &md_new_device.attr,
2317 NULL,
2318 };
2319
2320 static struct attribute *md_redundancy_attrs[] = {
2321 &md_scan_mode.attr,
2322 &md_mismatches.attr,
2323 &md_sync_min.attr,
2324 &md_sync_max.attr,
2325 &md_sync_speed.attr,
2326 &md_sync_completed.attr,
2327 NULL,
2328 };
2329 static struct attribute_group md_redundancy_group = {
2330 .name = NULL,
2331 .attrs = md_redundancy_attrs,
2332 };
2333
2334
2335 static ssize_t
2336 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2337 {
2338 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2339 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
2340 ssize_t rv;
2341
2342 if (!entry->show)
2343 return -EIO;
2344 mddev_lock(mddev);
2345 rv = entry->show(mddev, page);
2346 mddev_unlock(mddev);
2347 return rv;
2348 }
2349
2350 static ssize_t
2351 md_attr_store(struct kobject *kobj, struct attribute *attr,
2352 const char *page, size_t length)
2353 {
2354 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2355 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
2356 ssize_t rv;
2357
2358 if (!entry->store)
2359 return -EIO;
2360 mddev_lock(mddev);
2361 rv = entry->store(mddev, page, length);
2362 mddev_unlock(mddev);
2363 return rv;
2364 }
2365
2366 static void md_free(struct kobject *ko)
2367 {
2368 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2369 kfree(mddev);
2370 }
2371
2372 static struct sysfs_ops md_sysfs_ops = {
2373 .show = md_attr_show,
2374 .store = md_attr_store,
2375 };
2376 static struct kobj_type md_ktype = {
2377 .release = md_free,
2378 .sysfs_ops = &md_sysfs_ops,
2379 .default_attrs = md_default_attrs,
2380 };
2381
2382 int mdp_major = 0;
2383
2384 static struct kobject *md_probe(dev_t dev, int *part, void *data)
2385 {
2386 static DECLARE_MUTEX(disks_sem);
2387 mddev_t *mddev = mddev_find(dev);
2388 struct gendisk *disk;
2389 int partitioned = (MAJOR(dev) != MD_MAJOR);
2390 int shift = partitioned ? MdpMinorShift : 0;
2391 int unit = MINOR(dev) >> shift;
2392
2393 if (!mddev)
2394 return NULL;
2395
2396 down(&disks_sem);
2397 if (mddev->gendisk) {
2398 up(&disks_sem);
2399 mddev_put(mddev);
2400 return NULL;
2401 }
2402 disk = alloc_disk(1 << shift);
2403 if (!disk) {
2404 up(&disks_sem);
2405 mddev_put(mddev);
2406 return NULL;
2407 }
2408 disk->major = MAJOR(dev);
2409 disk->first_minor = unit << shift;
2410 if (partitioned) {
2411 sprintf(disk->disk_name, "md_d%d", unit);
2412 sprintf(disk->devfs_name, "md/d%d", unit);
2413 } else {
2414 sprintf(disk->disk_name, "md%d", unit);
2415 sprintf(disk->devfs_name, "md/%d", unit);
2416 }
2417 disk->fops = &md_fops;
2418 disk->private_data = mddev;
2419 disk->queue = mddev->queue;
2420 add_disk(disk);
2421 mddev->gendisk = disk;
2422 up(&disks_sem);
2423 mddev->kobj.parent = &disk->kobj;
2424 mddev->kobj.k_name = NULL;
2425 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
2426 mddev->kobj.ktype = &md_ktype;
2427 kobject_register(&mddev->kobj);
2428 return NULL;
2429 }
2430
2431 void md_wakeup_thread(mdk_thread_t *thread);
2432
2433 static void md_safemode_timeout(unsigned long data)
2434 {
2435 mddev_t *mddev = (mddev_t *) data;
2436
2437 mddev->safemode = 1;
2438 md_wakeup_thread(mddev->thread);
2439 }
2440
2441 static int start_dirty_degraded;
2442
2443 static int do_md_run(mddev_t * mddev)
2444 {
2445 int err;
2446 int chunk_size;
2447 struct list_head *tmp;
2448 mdk_rdev_t *rdev;
2449 struct gendisk *disk;
2450 struct mdk_personality *pers;
2451 char b[BDEVNAME_SIZE];
2452
2453 if (list_empty(&mddev->disks))
2454 /* cannot run an array with no devices.. */
2455 return -EINVAL;
2456
2457 if (mddev->pers)
2458 return -EBUSY;
2459
2460 /*
2461 * Analyze all RAID superblock(s)
2462 */
2463 if (!mddev->raid_disks)
2464 analyze_sbs(mddev);
2465
2466 chunk_size = mddev->chunk_size;
2467
2468 if (chunk_size) {
2469 if (chunk_size > MAX_CHUNK_SIZE) {
2470 printk(KERN_ERR "too big chunk_size: %d > %d\n",
2471 chunk_size, MAX_CHUNK_SIZE);
2472 return -EINVAL;
2473 }
2474 /*
2475 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2476 */
2477 if ( (1 << ffz(~chunk_size)) != chunk_size) {
2478 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
2479 return -EINVAL;
2480 }
2481 if (chunk_size < PAGE_SIZE) {
2482 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
2483 chunk_size, PAGE_SIZE);
2484 return -EINVAL;
2485 }
2486
2487 /* devices must have minimum size of one chunk */
2488 ITERATE_RDEV(mddev,rdev,tmp) {
2489 if (test_bit(Faulty, &rdev->flags))
2490 continue;
2491 if (rdev->size < chunk_size / 1024) {
2492 printk(KERN_WARNING
2493 "md: Dev %s smaller than chunk_size:"
2494 " %lluk < %dk\n",
2495 bdevname(rdev->bdev,b),
2496 (unsigned long long)rdev->size,
2497 chunk_size / 1024);
2498 return -EINVAL;
2499 }
2500 }
2501 }
2502
2503 #ifdef CONFIG_KMOD
2504 if (mddev->level != LEVEL_NONE)
2505 request_module("md-level-%d", mddev->level);
2506 else if (mddev->clevel[0])
2507 request_module("md-%s", mddev->clevel);
2508 #endif
2509
2510 /*
2511 * Drop all container device buffers, from now on
2512 * the only valid external interface is through the md
2513 * device.
2514 * Also find largest hardsector size
2515 */
2516 ITERATE_RDEV(mddev,rdev,tmp) {
2517 if (test_bit(Faulty, &rdev->flags))
2518 continue;
2519 sync_blockdev(rdev->bdev);
2520 invalidate_bdev(rdev->bdev, 0);
2521 }
2522
2523 md_probe(mddev->unit, NULL, NULL);
2524 disk = mddev->gendisk;
2525 if (!disk)
2526 return -ENOMEM;
2527
2528 spin_lock(&pers_lock);
2529 pers = find_pers(mddev->level, mddev->clevel);
2530 if (!pers || !try_module_get(pers->owner)) {
2531 spin_unlock(&pers_lock);
2532 if (mddev->level != LEVEL_NONE)
2533 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
2534 mddev->level);
2535 else
2536 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
2537 mddev->clevel);
2538 return -EINVAL;
2539 }
2540 mddev->pers = pers;
2541 spin_unlock(&pers_lock);
2542 mddev->level = pers->level;
2543 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
2544
2545 mddev->recovery = 0;
2546 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
2547 mddev->barriers_work = 1;
2548 mddev->ok_start_degraded = start_dirty_degraded;
2549
2550 if (start_readonly)
2551 mddev->ro = 2; /* read-only, but switch on first write */
2552
2553 err = mddev->pers->run(mddev);
2554 if (!err && mddev->pers->sync_request) {
2555 err = bitmap_create(mddev);
2556 if (err) {
2557 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
2558 mdname(mddev), err);
2559 mddev->pers->stop(mddev);
2560 }
2561 }
2562 if (err) {
2563 printk(KERN_ERR "md: pers->run() failed ...\n");
2564 module_put(mddev->pers->owner);
2565 mddev->pers = NULL;
2566 bitmap_destroy(mddev);
2567 return err;
2568 }
2569 if (mddev->pers->sync_request)
2570 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
2571 else if (mddev->ro == 2) /* auto-readonly not meaningful */
2572 mddev->ro = 0;
2573
2574 atomic_set(&mddev->writes_pending,0);
2575 mddev->safemode = 0;
2576 mddev->safemode_timer.function = md_safemode_timeout;
2577 mddev->safemode_timer.data = (unsigned long) mddev;
2578 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */
2579 mddev->in_sync = 1;
2580
2581 ITERATE_RDEV(mddev,rdev,tmp)
2582 if (rdev->raid_disk >= 0) {
2583 char nm[20];
2584 sprintf(nm, "rd%d", rdev->raid_disk);
2585 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2586 }
2587
2588 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2589 md_wakeup_thread(mddev->thread);
2590
2591 if (mddev->sb_dirty)
2592 md_update_sb(mddev);
2593
2594 set_capacity(disk, mddev->array_size<<1);
2595
2596 /* If we call blk_queue_make_request here, it will
2597 * re-initialise max_sectors etc which may have been
2598 * refined inside -> run. So just set the bits we need to set.
2599 * Most initialisation happended when we called
2600 * blk_queue_make_request(..., md_fail_request)
2601 * earlier.
2602 */
2603 mddev->queue->queuedata = mddev;
2604 mddev->queue->make_request_fn = mddev->pers->make_request;
2605
2606 mddev->changed = 1;
2607 md_new_event(mddev);
2608 return 0;
2609 }
2610
2611 static int restart_array(mddev_t *mddev)
2612 {
2613 struct gendisk *disk = mddev->gendisk;
2614 int err;
2615
2616 /*
2617 * Complain if it has no devices
2618 */
2619 err = -ENXIO;
2620 if (list_empty(&mddev->disks))
2621 goto out;
2622
2623 if (mddev->pers) {
2624 err = -EBUSY;
2625 if (!mddev->ro)
2626 goto out;
2627
2628 mddev->safemode = 0;
2629 mddev->ro = 0;
2630 set_disk_ro(disk, 0);
2631
2632 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2633 mdname(mddev));
2634 /*
2635 * Kick recovery or resync if necessary
2636 */
2637 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2638 md_wakeup_thread(mddev->thread);
2639 err = 0;
2640 } else {
2641 printk(KERN_ERR "md: %s has no personality assigned.\n",
2642 mdname(mddev));
2643 err = -EINVAL;
2644 }
2645
2646 out:
2647 return err;
2648 }
2649
2650 static int do_md_stop(mddev_t * mddev, int ro)
2651 {
2652 int err = 0;
2653 struct gendisk *disk = mddev->gendisk;
2654
2655 if (mddev->pers) {
2656 if (atomic_read(&mddev->active)>2) {
2657 printk("md: %s still in use.\n",mdname(mddev));
2658 return -EBUSY;
2659 }
2660
2661 if (mddev->sync_thread) {
2662 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2663 md_unregister_thread(mddev->sync_thread);
2664 mddev->sync_thread = NULL;
2665 }
2666
2667 del_timer_sync(&mddev->safemode_timer);
2668
2669 invalidate_partition(disk, 0);
2670
2671 if (ro) {
2672 err = -ENXIO;
2673 if (mddev->ro==1)
2674 goto out;
2675 mddev->ro = 1;
2676 } else {
2677 bitmap_flush(mddev);
2678 md_super_wait(mddev);
2679 if (mddev->ro)
2680 set_disk_ro(disk, 0);
2681 blk_queue_make_request(mddev->queue, md_fail_request);
2682 mddev->pers->stop(mddev);
2683 if (mddev->pers->sync_request)
2684 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
2685
2686 module_put(mddev->pers->owner);
2687 mddev->pers = NULL;
2688 if (mddev->ro)
2689 mddev->ro = 0;
2690 }
2691 if (!mddev->in_sync) {
2692 /* mark array as shutdown cleanly */
2693 mddev->in_sync = 1;
2694 md_update_sb(mddev);
2695 }
2696 if (ro)
2697 set_disk_ro(disk, 1);
2698 }
2699
2700 /*
2701 * Free resources if final stop
2702 */
2703 if (!ro) {
2704 mdk_rdev_t *rdev;
2705 struct list_head *tmp;
2706 struct gendisk *disk;
2707 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
2708
2709 bitmap_destroy(mddev);
2710 if (mddev->bitmap_file) {
2711 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
2712 fput(mddev->bitmap_file);
2713 mddev->bitmap_file = NULL;
2714 }
2715 mddev->bitmap_offset = 0;
2716
2717 ITERATE_RDEV(mddev,rdev,tmp)
2718 if (rdev->raid_disk >= 0) {
2719 char nm[20];
2720 sprintf(nm, "rd%d", rdev->raid_disk);
2721 sysfs_remove_link(&mddev->kobj, nm);
2722 }
2723
2724 export_array(mddev);
2725
2726 mddev->array_size = 0;
2727 disk = mddev->gendisk;
2728 if (disk)
2729 set_capacity(disk, 0);
2730 mddev->changed = 1;
2731 } else
2732 printk(KERN_INFO "md: %s switched to read-only mode.\n",
2733 mdname(mddev));
2734 err = 0;
2735 md_new_event(mddev);
2736 out:
2737 return err;
2738 }
2739
2740 static void autorun_array(mddev_t *mddev)
2741 {
2742 mdk_rdev_t *rdev;
2743 struct list_head *tmp;
2744 int err;
2745
2746 if (list_empty(&mddev->disks))
2747 return;
2748
2749 printk(KERN_INFO "md: running: ");
2750
2751 ITERATE_RDEV(mddev,rdev,tmp) {
2752 char b[BDEVNAME_SIZE];
2753 printk("<%s>", bdevname(rdev->bdev,b));
2754 }
2755 printk("\n");
2756
2757 err = do_md_run (mddev);
2758 if (err) {
2759 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
2760 do_md_stop (mddev, 0);
2761 }
2762 }
2763
2764 /*
2765 * lets try to run arrays based on all disks that have arrived
2766 * until now. (those are in pending_raid_disks)
2767 *
2768 * the method: pick the first pending disk, collect all disks with
2769 * the same UUID, remove all from the pending list and put them into
2770 * the 'same_array' list. Then order this list based on superblock
2771 * update time (freshest comes first), kick out 'old' disks and
2772 * compare superblocks. If everything's fine then run it.
2773 *
2774 * If "unit" is allocated, then bump its reference count
2775 */
2776 static void autorun_devices(int part)
2777 {
2778 struct list_head candidates;
2779 struct list_head *tmp;
2780 mdk_rdev_t *rdev0, *rdev;
2781 mddev_t *mddev;
2782 char b[BDEVNAME_SIZE];
2783
2784 printk(KERN_INFO "md: autorun ...\n");
2785 while (!list_empty(&pending_raid_disks)) {
2786 dev_t dev;
2787 rdev0 = list_entry(pending_raid_disks.next,
2788 mdk_rdev_t, same_set);
2789
2790 printk(KERN_INFO "md: considering %s ...\n",
2791 bdevname(rdev0->bdev,b));
2792 INIT_LIST_HEAD(&candidates);
2793 ITERATE_RDEV_PENDING(rdev,tmp)
2794 if (super_90_load(rdev, rdev0, 0) >= 0) {
2795 printk(KERN_INFO "md: adding %s ...\n",
2796 bdevname(rdev->bdev,b));
2797 list_move(&rdev->same_set, &candidates);
2798 }
2799 /*
2800 * now we have a set of devices, with all of them having
2801 * mostly sane superblocks. It's time to allocate the
2802 * mddev.
2803 */
2804 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
2805 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
2806 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
2807 break;
2808 }
2809 if (part)
2810 dev = MKDEV(mdp_major,
2811 rdev0->preferred_minor << MdpMinorShift);
2812 else
2813 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
2814
2815 md_probe(dev, NULL, NULL);
2816 mddev = mddev_find(dev);
2817 if (!mddev) {
2818 printk(KERN_ERR
2819 "md: cannot allocate memory for md drive.\n");
2820 break;
2821 }
2822 if (mddev_lock(mddev))
2823 printk(KERN_WARNING "md: %s locked, cannot run\n",
2824 mdname(mddev));
2825 else if (mddev->raid_disks || mddev->major_version
2826 || !list_empty(&mddev->disks)) {
2827 printk(KERN_WARNING
2828 "md: %s already running, cannot run %s\n",
2829 mdname(mddev), bdevname(rdev0->bdev,b));
2830 mddev_unlock(mddev);
2831 } else {
2832 printk(KERN_INFO "md: created %s\n", mdname(mddev));
2833 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
2834 list_del_init(&rdev->same_set);
2835 if (bind_rdev_to_array(rdev, mddev))
2836 export_rdev(rdev);
2837 }
2838 autorun_array(mddev);
2839 mddev_unlock(mddev);
2840 }
2841 /* on success, candidates will be empty, on error
2842 * it won't...
2843 */
2844 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
2845 export_rdev(rdev);
2846 mddev_put(mddev);
2847 }
2848 printk(KERN_INFO "md: ... autorun DONE.\n");
2849 }
2850
2851 /*
2852 * import RAID devices based on one partition
2853 * if possible, the array gets run as well.
2854 */
2855
2856 static int autostart_array(dev_t startdev)
2857 {
2858 char b[BDEVNAME_SIZE];
2859 int err = -EINVAL, i;
2860 mdp_super_t *sb = NULL;
2861 mdk_rdev_t *start_rdev = NULL, *rdev;
2862
2863 start_rdev = md_import_device(startdev, 0, 0);
2864 if (IS_ERR(start_rdev))
2865 return err;
2866
2867
2868 /* NOTE: this can only work for 0.90.0 superblocks */
2869 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
2870 if (sb->major_version != 0 ||
2871 sb->minor_version != 90 ) {
2872 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
2873 export_rdev(start_rdev);
2874 return err;
2875 }
2876
2877 if (test_bit(Faulty, &start_rdev->flags)) {
2878 printk(KERN_WARNING
2879 "md: can not autostart based on faulty %s!\n",
2880 bdevname(start_rdev->bdev,b));
2881 export_rdev(start_rdev);
2882 return err;
2883 }
2884 list_add(&start_rdev->same_set, &pending_raid_disks);
2885
2886 for (i = 0; i < MD_SB_DISKS; i++) {
2887 mdp_disk_t *desc = sb->disks + i;
2888 dev_t dev = MKDEV(desc->major, desc->minor);
2889
2890 if (!dev)
2891 continue;
2892 if (dev == startdev)
2893 continue;
2894 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
2895 continue;
2896 rdev = md_import_device(dev, 0, 0);
2897 if (IS_ERR(rdev))
2898 continue;
2899
2900 list_add(&rdev->same_set, &pending_raid_disks);
2901 }
2902
2903 /*
2904 * possibly return codes
2905 */
2906 autorun_devices(0);
2907 return 0;
2908
2909 }
2910
2911
2912 static int get_version(void __user * arg)
2913 {
2914 mdu_version_t ver;
2915
2916 ver.major = MD_MAJOR_VERSION;
2917 ver.minor = MD_MINOR_VERSION;
2918 ver.patchlevel = MD_PATCHLEVEL_VERSION;
2919
2920 if (copy_to_user(arg, &ver, sizeof(ver)))
2921 return -EFAULT;
2922
2923 return 0;
2924 }
2925
2926 static int get_array_info(mddev_t * mddev, void __user * arg)
2927 {
2928 mdu_array_info_t info;
2929 int nr,working,active,failed,spare;
2930 mdk_rdev_t *rdev;
2931 struct list_head *tmp;
2932
2933 nr=working=active=failed=spare=0;
2934 ITERATE_RDEV(mddev,rdev,tmp) {
2935 nr++;
2936 if (test_bit(Faulty, &rdev->flags))
2937 failed++;
2938 else {
2939 working++;
2940 if (test_bit(In_sync, &rdev->flags))
2941 active++;
2942 else
2943 spare++;
2944 }
2945 }
2946
2947 info.major_version = mddev->major_version;
2948 info.minor_version = mddev->minor_version;
2949 info.patch_version = MD_PATCHLEVEL_VERSION;
2950 info.ctime = mddev->ctime;
2951 info.level = mddev->level;
2952 info.size = mddev->size;
2953 if (info.size != mddev->size) /* overflow */
2954 info.size = -1;
2955 info.nr_disks = nr;
2956 info.raid_disks = mddev->raid_disks;
2957 info.md_minor = mddev->md_minor;
2958 info.not_persistent= !mddev->persistent;
2959
2960 info.utime = mddev->utime;
2961 info.state = 0;
2962 if (mddev->in_sync)
2963 info.state = (1<<MD_SB_CLEAN);
2964 if (mddev->bitmap && mddev->bitmap_offset)
2965 info.state = (1<<MD_SB_BITMAP_PRESENT);
2966 info.active_disks = active;
2967 info.working_disks = working;
2968 info.failed_disks = failed;
2969 info.spare_disks = spare;
2970
2971 info.layout = mddev->layout;
2972 info.chunk_size = mddev->chunk_size;
2973
2974 if (copy_to_user(arg, &info, sizeof(info)))
2975 return -EFAULT;
2976
2977 return 0;
2978 }
2979
2980 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
2981 {
2982 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
2983 char *ptr, *buf = NULL;
2984 int err = -ENOMEM;
2985
2986 file = kmalloc(sizeof(*file), GFP_KERNEL);
2987 if (!file)
2988 goto out;
2989
2990 /* bitmap disabled, zero the first byte and copy out */
2991 if (!mddev->bitmap || !mddev->bitmap->file) {
2992 file->pathname[0] = '\0';
2993 goto copy_out;
2994 }
2995
2996 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
2997 if (!buf)
2998 goto out;
2999
3000 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3001 if (!ptr)
3002 goto out;
3003
3004 strcpy(file->pathname, ptr);
3005
3006 copy_out:
3007 err = 0;
3008 if (copy_to_user(arg, file, sizeof(*file)))
3009 err = -EFAULT;
3010 out:
3011 kfree(buf);
3012 kfree(file);
3013 return err;
3014 }
3015
3016 static int get_disk_info(mddev_t * mddev, void __user * arg)
3017 {
3018 mdu_disk_info_t info;
3019 unsigned int nr;
3020 mdk_rdev_t *rdev;
3021
3022 if (copy_from_user(&info, arg, sizeof(info)))
3023 return -EFAULT;
3024
3025 nr = info.number;
3026
3027 rdev = find_rdev_nr(mddev, nr);
3028 if (rdev) {
3029 info.major = MAJOR(rdev->bdev->bd_dev);
3030 info.minor = MINOR(rdev->bdev->bd_dev);
3031 info.raid_disk = rdev->raid_disk;
3032 info.state = 0;
3033 if (test_bit(Faulty, &rdev->flags))
3034 info.state |= (1<<MD_DISK_FAULTY);
3035 else if (test_bit(In_sync, &rdev->flags)) {
3036 info.state |= (1<<MD_DISK_ACTIVE);
3037 info.state |= (1<<MD_DISK_SYNC);
3038 }
3039 if (test_bit(WriteMostly, &rdev->flags))
3040 info.state |= (1<<MD_DISK_WRITEMOSTLY);
3041 } else {
3042 info.major = info.minor = 0;
3043 info.raid_disk = -1;
3044 info.state = (1<<MD_DISK_REMOVED);
3045 }
3046
3047 if (copy_to_user(arg, &info, sizeof(info)))
3048 return -EFAULT;
3049
3050 return 0;
3051 }
3052
3053 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3054 {
3055 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3056 mdk_rdev_t *rdev;
3057 dev_t dev = MKDEV(info->major,info->minor);
3058
3059 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3060 return -EOVERFLOW;
3061
3062 if (!mddev->raid_disks) {
3063 int err;
3064 /* expecting a device which has a superblock */
3065 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3066 if (IS_ERR(rdev)) {
3067 printk(KERN_WARNING
3068 "md: md_import_device returned %ld\n",
3069 PTR_ERR(rdev));
3070 return PTR_ERR(rdev);
3071 }
3072 if (!list_empty(&mddev->disks)) {
3073 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3074 mdk_rdev_t, same_set);
3075 int err = super_types[mddev->major_version]
3076 .load_super(rdev, rdev0, mddev->minor_version);
3077 if (err < 0) {
3078 printk(KERN_WARNING
3079 "md: %s has different UUID to %s\n",
3080 bdevname(rdev->bdev,b),
3081 bdevname(rdev0->bdev,b2));
3082 export_rdev(rdev);
3083 return -EINVAL;
3084 }
3085 }
3086 err = bind_rdev_to_array(rdev, mddev);
3087 if (err)
3088 export_rdev(rdev);
3089 return err;
3090 }
3091
3092 /*
3093 * add_new_disk can be used once the array is assembled
3094 * to add "hot spares". They must already have a superblock
3095 * written
3096 */
3097 if (mddev->pers) {
3098 int err;
3099 if (!mddev->pers->hot_add_disk) {
3100 printk(KERN_WARNING
3101 "%s: personality does not support diskops!\n",
3102 mdname(mddev));
3103 return -EINVAL;
3104 }
3105 if (mddev->persistent)
3106 rdev = md_import_device(dev, mddev->major_version,
3107 mddev->minor_version);
3108 else
3109 rdev = md_import_device(dev, -1, -1);
3110 if (IS_ERR(rdev)) {
3111 printk(KERN_WARNING
3112 "md: md_import_device returned %ld\n",
3113 PTR_ERR(rdev));
3114 return PTR_ERR(rdev);
3115 }
3116 /* set save_raid_disk if appropriate */
3117 if (!mddev->persistent) {
3118 if (info->state & (1<<MD_DISK_SYNC) &&
3119 info->raid_disk < mddev->raid_disks)
3120 rdev->raid_disk = info->raid_disk;
3121 else
3122 rdev->raid_disk = -1;
3123 } else
3124 super_types[mddev->major_version].
3125 validate_super(mddev, rdev);
3126 rdev->saved_raid_disk = rdev->raid_disk;
3127
3128 clear_bit(In_sync, &rdev->flags); /* just to be sure */
3129 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3130 set_bit(WriteMostly, &rdev->flags);
3131
3132 rdev->raid_disk = -1;
3133 err = bind_rdev_to_array(rdev, mddev);
3134 if (err)
3135 export_rdev(rdev);
3136
3137 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3138 md_wakeup_thread(mddev->thread);
3139 return err;
3140 }
3141
3142 /* otherwise, add_new_disk is only allowed
3143 * for major_version==0 superblocks
3144 */
3145 if (mddev->major_version != 0) {
3146 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3147 mdname(mddev));
3148 return -EINVAL;
3149 }
3150
3151 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3152 int err;
3153 rdev = md_import_device (dev, -1, 0);
3154 if (IS_ERR(rdev)) {
3155 printk(KERN_WARNING
3156 "md: error, md_import_device() returned %ld\n",
3157 PTR_ERR(rdev));
3158 return PTR_ERR(rdev);
3159 }
3160 rdev->desc_nr = info->number;
3161 if (info->raid_disk < mddev->raid_disks)
3162 rdev->raid_disk = info->raid_disk;
3163 else
3164 rdev->raid_disk = -1;
3165
3166 rdev->flags = 0;
3167
3168 if (rdev->raid_disk < mddev->raid_disks)
3169 if (info->state & (1<<MD_DISK_SYNC))
3170 set_bit(In_sync, &rdev->flags);
3171
3172 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3173 set_bit(WriteMostly, &rdev->flags);
3174
3175 if (!mddev->persistent) {
3176 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3177 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3178 } else
3179 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3180 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3181
3182 err = bind_rdev_to_array(rdev, mddev);
3183 if (err) {
3184 export_rdev(rdev);
3185 return err;
3186 }
3187 }
3188
3189 return 0;
3190 }
3191
3192 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3193 {
3194 char b[BDEVNAME_SIZE];
3195 mdk_rdev_t *rdev;
3196
3197 if (!mddev->pers)
3198 return -ENODEV;
3199
3200 rdev = find_rdev(mddev, dev);
3201 if (!rdev)
3202 return -ENXIO;
3203
3204 if (rdev->raid_disk >= 0)
3205 goto busy;
3206
3207 kick_rdev_from_array(rdev);
3208 md_update_sb(mddev);
3209 md_new_event(mddev);
3210
3211 return 0;
3212 busy:
3213 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3214 bdevname(rdev->bdev,b), mdname(mddev));
3215 return -EBUSY;
3216 }
3217
3218 static int hot_add_disk(mddev_t * mddev, dev_t dev)
3219 {
3220 char b[BDEVNAME_SIZE];
3221 int err;
3222 unsigned int size;
3223 mdk_rdev_t *rdev;
3224
3225 if (!mddev->pers)
3226 return -ENODEV;
3227
3228 if (mddev->major_version != 0) {
3229 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3230 " version-0 superblocks.\n",
3231 mdname(mddev));
3232 return -EINVAL;
3233 }
3234 if (!mddev->pers->hot_add_disk) {
3235 printk(KERN_WARNING
3236 "%s: personality does not support diskops!\n",
3237 mdname(mddev));
3238 return -EINVAL;
3239 }
3240
3241 rdev = md_import_device (dev, -1, 0);
3242 if (IS_ERR(rdev)) {
3243 printk(KERN_WARNING
3244 "md: error, md_import_device() returned %ld\n",
3245 PTR_ERR(rdev));
3246 return -EINVAL;
3247 }
3248
3249 if (mddev->persistent)
3250 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3251 else
3252 rdev->sb_offset =
3253 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3254
3255 size = calc_dev_size(rdev, mddev->chunk_size);
3256 rdev->size = size;
3257
3258 if (test_bit(Faulty, &rdev->flags)) {
3259 printk(KERN_WARNING
3260 "md: can not hot-add faulty %s disk to %s!\n",
3261 bdevname(rdev->bdev,b), mdname(mddev));
3262 err = -EINVAL;
3263 goto abort_export;
3264 }
3265 clear_bit(In_sync, &rdev->flags);
3266 rdev->desc_nr = -1;
3267 err = bind_rdev_to_array(rdev, mddev);
3268 if (err)
3269 goto abort_export;
3270
3271 /*
3272 * The rest should better be atomic, we can have disk failures
3273 * noticed in interrupt contexts ...
3274 */
3275
3276 if (rdev->desc_nr == mddev->max_disks) {
3277 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
3278 mdname(mddev));
3279 err = -EBUSY;
3280 goto abort_unbind_export;
3281 }
3282
3283 rdev->raid_disk = -1;
3284
3285 md_update_sb(mddev);
3286
3287 /*
3288 * Kick recovery, maybe this spare has to be added to the
3289 * array immediately.
3290 */
3291 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3292 md_wakeup_thread(mddev->thread);
3293 md_new_event(mddev);
3294 return 0;
3295
3296 abort_unbind_export:
3297 unbind_rdev_from_array(rdev);
3298
3299 abort_export:
3300 export_rdev(rdev);
3301 return err;
3302 }
3303
3304 /* similar to deny_write_access, but accounts for our holding a reference
3305 * to the file ourselves */
3306 static int deny_bitmap_write_access(struct file * file)
3307 {
3308 struct inode *inode = file->f_mapping->host;
3309
3310 spin_lock(&inode->i_lock);
3311 if (atomic_read(&inode->i_writecount) > 1) {
3312 spin_unlock(&inode->i_lock);
3313 return -ETXTBSY;
3314 }
3315 atomic_set(&inode->i_writecount, -1);
3316 spin_unlock(&inode->i_lock);
3317
3318 return 0;
3319 }
3320
3321 static int set_bitmap_file(mddev_t *mddev, int fd)
3322 {
3323 int err;
3324
3325 if (mddev->pers) {
3326 if (!mddev->pers->quiesce)
3327 return -EBUSY;
3328 if (mddev->recovery || mddev->sync_thread)
3329 return -EBUSY;
3330 /* we should be able to change the bitmap.. */
3331 }
3332
3333
3334 if (fd >= 0) {
3335 if (mddev->bitmap)
3336 return -EEXIST; /* cannot add when bitmap is present */
3337 mddev->bitmap_file = fget(fd);
3338
3339 if (mddev->bitmap_file == NULL) {
3340 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
3341 mdname(mddev));
3342 return -EBADF;
3343 }
3344
3345 err = deny_bitmap_write_access(mddev->bitmap_file);
3346 if (err) {
3347 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
3348 mdname(mddev));
3349 fput(mddev->bitmap_file);
3350 mddev->bitmap_file = NULL;
3351 return err;
3352 }
3353 mddev->bitmap_offset = 0; /* file overrides offset */
3354 } else if (mddev->bitmap == NULL)
3355 return -ENOENT; /* cannot remove what isn't there */
3356 err = 0;
3357 if (mddev->pers) {
3358 mddev->pers->quiesce(mddev, 1);
3359 if (fd >= 0)
3360 err = bitmap_create(mddev);
3361 if (fd < 0 || err)
3362 bitmap_destroy(mddev);
3363 mddev->pers->quiesce(mddev, 0);
3364 } else if (fd < 0) {
3365 if (mddev->bitmap_file)
3366 fput(mddev->bitmap_file);
3367 mddev->bitmap_file = NULL;
3368 }
3369
3370 return err;
3371 }
3372
3373 /*
3374 * set_array_info is used two different ways
3375 * The original usage is when creating a new array.
3376 * In this usage, raid_disks is > 0 and it together with
3377 * level, size, not_persistent,layout,chunksize determine the
3378 * shape of the array.
3379 * This will always create an array with a type-0.90.0 superblock.
3380 * The newer usage is when assembling an array.
3381 * In this case raid_disks will be 0, and the major_version field is
3382 * use to determine which style super-blocks are to be found on the devices.
3383 * The minor and patch _version numbers are also kept incase the
3384 * super_block handler wishes to interpret them.
3385 */
3386 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
3387 {
3388
3389 if (info->raid_disks == 0) {
3390 /* just setting version number for superblock loading */
3391 if (info->major_version < 0 ||
3392 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
3393 super_types[info->major_version].name == NULL) {
3394 /* maybe try to auto-load a module? */
3395 printk(KERN_INFO
3396 "md: superblock version %d not known\n",
3397 info->major_version);
3398 return -EINVAL;
3399 }
3400 mddev->major_version = info->major_version;
3401 mddev->minor_version = info->minor_version;
3402 mddev->patch_version = info->patch_version;
3403 return 0;
3404 }
3405 mddev->major_version = MD_MAJOR_VERSION;
3406 mddev->minor_version = MD_MINOR_VERSION;
3407 mddev->patch_version = MD_PATCHLEVEL_VERSION;
3408 mddev->ctime = get_seconds();
3409
3410 mddev->level = info->level;
3411 mddev->clevel[0] = 0;
3412 mddev->size = info->size;
3413 mddev->raid_disks = info->raid_disks;
3414 /* don't set md_minor, it is determined by which /dev/md* was
3415 * openned
3416 */
3417 if (info->state & (1<<MD_SB_CLEAN))
3418 mddev->recovery_cp = MaxSector;
3419 else
3420 mddev->recovery_cp = 0;
3421 mddev->persistent = ! info->not_persistent;
3422
3423 mddev->layout = info->layout;
3424 mddev->chunk_size = info->chunk_size;
3425
3426 mddev->max_disks = MD_SB_DISKS;
3427
3428 mddev->sb_dirty = 1;
3429
3430 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
3431 mddev->bitmap_offset = 0;
3432
3433 /*
3434 * Generate a 128 bit UUID
3435 */
3436 get_random_bytes(mddev->uuid, 16);
3437
3438 return 0;
3439 }
3440
3441 static int update_size(mddev_t *mddev, unsigned long size)
3442 {
3443 mdk_rdev_t * rdev;
3444 int rv;
3445 struct list_head *tmp;
3446
3447 if (mddev->pers->resize == NULL)
3448 return -EINVAL;
3449 /* The "size" is the amount of each device that is used.
3450 * This can only make sense for arrays with redundancy.
3451 * linear and raid0 always use whatever space is available
3452 * We can only consider changing the size if no resync
3453 * or reconstruction is happening, and if the new size
3454 * is acceptable. It must fit before the sb_offset or,
3455 * if that is <data_offset, it must fit before the
3456 * size of each device.
3457 * If size is zero, we find the largest size that fits.
3458 */
3459 if (mddev->sync_thread)
3460 return -EBUSY;
3461 ITERATE_RDEV(mddev,rdev,tmp) {
3462 sector_t avail;
3463 int fit = (size == 0);
3464 if (rdev->sb_offset > rdev->data_offset)
3465 avail = (rdev->sb_offset*2) - rdev->data_offset;
3466 else
3467 avail = get_capacity(rdev->bdev->bd_disk)
3468 - rdev->data_offset;
3469 if (fit && (size == 0 || size > avail/2))
3470 size = avail/2;
3471 if (avail < ((sector_t)size << 1))
3472 return -ENOSPC;
3473 }
3474 rv = mddev->pers->resize(mddev, (sector_t)size *2);
3475 if (!rv) {
3476 struct block_device *bdev;
3477
3478 bdev = bdget_disk(mddev->gendisk, 0);
3479 if (bdev) {
3480 mutex_lock(&bdev->bd_inode->i_mutex);
3481 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
3482 mutex_unlock(&bdev->bd_inode->i_mutex);
3483 bdput(bdev);
3484 }
3485 }
3486 return rv;
3487 }
3488
3489 static int update_raid_disks(mddev_t *mddev, int raid_disks)
3490 {
3491 int rv;
3492 /* change the number of raid disks */
3493 if (mddev->pers->reshape == NULL)
3494 return -EINVAL;
3495 if (raid_disks <= 0 ||
3496 raid_disks >= mddev->max_disks)
3497 return -EINVAL;
3498 if (mddev->sync_thread)
3499 return -EBUSY;
3500 rv = mddev->pers->reshape(mddev, raid_disks);
3501 return rv;
3502 }
3503
3504
3505 /*
3506 * update_array_info is used to change the configuration of an
3507 * on-line array.
3508 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
3509 * fields in the info are checked against the array.
3510 * Any differences that cannot be handled will cause an error.
3511 * Normally, only one change can be managed at a time.
3512 */
3513 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
3514 {
3515 int rv = 0;
3516 int cnt = 0;
3517 int state = 0;
3518
3519 /* calculate expected state,ignoring low bits */
3520 if (mddev->bitmap && mddev->bitmap_offset)
3521 state |= (1 << MD_SB_BITMAP_PRESENT);
3522
3523 if (mddev->major_version != info->major_version ||
3524 mddev->minor_version != info->minor_version ||
3525 /* mddev->patch_version != info->patch_version || */
3526 mddev->ctime != info->ctime ||
3527 mddev->level != info->level ||
3528 /* mddev->layout != info->layout || */
3529 !mddev->persistent != info->not_persistent||
3530 mddev->chunk_size != info->chunk_size ||
3531 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
3532 ((state^info->state) & 0xfffffe00)
3533 )
3534 return -EINVAL;
3535 /* Check there is only one change */
3536 if (info->size >= 0 && mddev->size != info->size) cnt++;
3537 if (mddev->raid_disks != info->raid_disks) cnt++;
3538 if (mddev->layout != info->layout) cnt++;
3539 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
3540 if (cnt == 0) return 0;
3541 if (cnt > 1) return -EINVAL;
3542
3543 if (mddev->layout != info->layout) {
3544 /* Change layout
3545 * we don't need to do anything at the md level, the
3546 * personality will take care of it all.
3547 */
3548 if (mddev->pers->reconfig == NULL)
3549 return -EINVAL;
3550 else
3551 return mddev->pers->reconfig(mddev, info->layout, -1);
3552 }
3553 if (info->size >= 0 && mddev->size != info->size)
3554 rv = update_size(mddev, info->size);
3555
3556 if (mddev->raid_disks != info->raid_disks)
3557 rv = update_raid_disks(mddev, info->raid_disks);
3558
3559 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
3560 if (mddev->pers->quiesce == NULL)
3561 return -EINVAL;
3562 if (mddev->recovery || mddev->sync_thread)
3563 return -EBUSY;
3564 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
3565 /* add the bitmap */
3566 if (mddev->bitmap)
3567 return -EEXIST;
3568 if (mddev->default_bitmap_offset == 0)
3569 return -EINVAL;
3570 mddev->bitmap_offset = mddev->default_bitmap_offset;
3571 mddev->pers->quiesce(mddev, 1);
3572 rv = bitmap_create(mddev);
3573 if (rv)
3574 bitmap_destroy(mddev);
3575 mddev->pers->quiesce(mddev, 0);
3576 } else {
3577 /* remove the bitmap */
3578 if (!mddev->bitmap)
3579 return -ENOENT;
3580 if (mddev->bitmap->file)
3581 return -EINVAL;
3582 mddev->pers->quiesce(mddev, 1);
3583 bitmap_destroy(mddev);
3584 mddev->pers->quiesce(mddev, 0);
3585 mddev->bitmap_offset = 0;
3586 }
3587 }
3588 md_update_sb(mddev);
3589 return rv;
3590 }
3591
3592 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3593 {
3594 mdk_rdev_t *rdev;
3595
3596 if (mddev->pers == NULL)
3597 return -ENODEV;
3598
3599 rdev = find_rdev(mddev, dev);
3600 if (!rdev)
3601 return -ENODEV;
3602
3603 md_error(mddev, rdev);
3604 return 0;
3605 }
3606
3607 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3608 {
3609 mddev_t *mddev = bdev->bd_disk->private_data;
3610
3611 geo->heads = 2;
3612 geo->sectors = 4;
3613 geo->cylinders = get_capacity(mddev->gendisk) / 8;
3614 return 0;
3615 }
3616
3617 static int md_ioctl(struct inode *inode, struct file *file,
3618 unsigned int cmd, unsigned long arg)
3619 {
3620 int err = 0;
3621 void __user *argp = (void __user *)arg;
3622 mddev_t *mddev = NULL;
3623
3624 if (!capable(CAP_SYS_ADMIN))
3625 return -EACCES;
3626
3627 /*
3628 * Commands dealing with the RAID driver but not any
3629 * particular array:
3630 */
3631 switch (cmd)
3632 {
3633 case RAID_VERSION:
3634 err = get_version(argp);
3635 goto done;
3636
3637 case PRINT_RAID_DEBUG:
3638 err = 0;
3639 md_print_devices();
3640 goto done;
3641
3642 #ifndef MODULE
3643 case RAID_AUTORUN:
3644 err = 0;
3645 autostart_arrays(arg);
3646 goto done;
3647 #endif
3648 default:;
3649 }
3650
3651 /*
3652 * Commands creating/starting a new array:
3653 */
3654
3655 mddev = inode->i_bdev->bd_disk->private_data;
3656
3657 if (!mddev) {
3658 BUG();
3659 goto abort;
3660 }
3661
3662
3663 if (cmd == START_ARRAY) {
3664 /* START_ARRAY doesn't need to lock the array as autostart_array
3665 * does the locking, and it could even be a different array
3666 */
3667 static int cnt = 3;
3668 if (cnt > 0 ) {
3669 printk(KERN_WARNING
3670 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
3671 "This will not be supported beyond July 2006\n",
3672 current->comm, current->pid);
3673 cnt--;
3674 }
3675 err = autostart_array(new_decode_dev(arg));
3676 if (err) {
3677 printk(KERN_WARNING "md: autostart failed!\n");
3678 goto abort;
3679 }
3680 goto done;
3681 }
3682
3683 err = mddev_lock(mddev);
3684 if (err) {
3685 printk(KERN_INFO
3686 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3687 err, cmd);
3688 goto abort;
3689 }
3690
3691 switch (cmd)
3692 {
3693 case SET_ARRAY_INFO:
3694 {
3695 mdu_array_info_t info;
3696 if (!arg)
3697 memset(&info, 0, sizeof(info));
3698 else if (copy_from_user(&info, argp, sizeof(info))) {
3699 err = -EFAULT;
3700 goto abort_unlock;
3701 }
3702 if (mddev->pers) {
3703 err = update_array_info(mddev, &info);
3704 if (err) {
3705 printk(KERN_WARNING "md: couldn't update"
3706 " array info. %d\n", err);
3707 goto abort_unlock;
3708 }
3709 goto done_unlock;
3710 }
3711 if (!list_empty(&mddev->disks)) {
3712 printk(KERN_WARNING
3713 "md: array %s already has disks!\n",
3714 mdname(mddev));
3715 err = -EBUSY;
3716 goto abort_unlock;
3717 }
3718 if (mddev->raid_disks) {
3719 printk(KERN_WARNING
3720 "md: array %s already initialised!\n",
3721 mdname(mddev));
3722 err = -EBUSY;
3723 goto abort_unlock;
3724 }
3725 err = set_array_info(mddev, &info);
3726 if (err) {
3727 printk(KERN_WARNING "md: couldn't set"
3728 " array info. %d\n", err);
3729 goto abort_unlock;
3730 }
3731 }
3732 goto done_unlock;
3733
3734 default:;
3735 }
3736
3737 /*
3738 * Commands querying/configuring an existing array:
3739 */
3740 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3741 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3742 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3743 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
3744 err = -ENODEV;
3745 goto abort_unlock;
3746 }
3747
3748 /*
3749 * Commands even a read-only array can execute:
3750 */
3751 switch (cmd)
3752 {
3753 case GET_ARRAY_INFO:
3754 err = get_array_info(mddev, argp);
3755 goto done_unlock;
3756
3757 case GET_BITMAP_FILE:
3758 err = get_bitmap_file(mddev, argp);
3759 goto done_unlock;
3760
3761 case GET_DISK_INFO:
3762 err = get_disk_info(mddev, argp);
3763 goto done_unlock;
3764
3765 case RESTART_ARRAY_RW:
3766 err = restart_array(mddev);
3767 goto done_unlock;
3768
3769 case STOP_ARRAY:
3770 err = do_md_stop (mddev, 0);
3771 goto done_unlock;
3772
3773 case STOP_ARRAY_RO:
3774 err = do_md_stop (mddev, 1);
3775 goto done_unlock;
3776
3777 /*
3778 * We have a problem here : there is no easy way to give a CHS
3779 * virtual geometry. We currently pretend that we have a 2 heads
3780 * 4 sectors (with a BIG number of cylinders...). This drives
3781 * dosfs just mad... ;-)
3782 */
3783 }
3784
3785 /*
3786 * The remaining ioctls are changing the state of the
3787 * superblock, so we do not allow them on read-only arrays.
3788 * However non-MD ioctls (e.g. get-size) will still come through
3789 * here and hit the 'default' below, so only disallow
3790 * 'md' ioctls, and switch to rw mode if started auto-readonly.
3791 */
3792 if (_IOC_TYPE(cmd) == MD_MAJOR &&
3793 mddev->ro && mddev->pers) {
3794 if (mddev->ro == 2) {
3795 mddev->ro = 0;
3796 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3797 md_wakeup_thread(mddev->thread);
3798
3799 } else {
3800 err = -EROFS;
3801 goto abort_unlock;
3802 }
3803 }
3804
3805 switch (cmd)
3806 {
3807 case ADD_NEW_DISK:
3808 {
3809 mdu_disk_info_t info;
3810 if (copy_from_user(&info, argp, sizeof(info)))
3811 err = -EFAULT;
3812 else
3813 err = add_new_disk(mddev, &info);
3814 goto done_unlock;
3815 }
3816
3817 case HOT_REMOVE_DISK:
3818 err = hot_remove_disk(mddev, new_decode_dev(arg));
3819 goto done_unlock;
3820
3821 case HOT_ADD_DISK:
3822 err = hot_add_disk(mddev, new_decode_dev(arg));
3823 goto done_unlock;
3824
3825 case SET_DISK_FAULTY:
3826 err = set_disk_faulty(mddev, new_decode_dev(arg));
3827 goto done_unlock;
3828
3829 case RUN_ARRAY:
3830 err = do_md_run (mddev);
3831 goto done_unlock;
3832
3833 case SET_BITMAP_FILE:
3834 err = set_bitmap_file(mddev, (int)arg);
3835 goto done_unlock;
3836
3837 default:
3838 if (_IOC_TYPE(cmd) == MD_MAJOR)
3839 printk(KERN_WARNING "md: %s(pid %d) used"
3840 " obsolete MD ioctl, upgrade your"
3841 " software to use new ictls.\n",
3842 current->comm, current->pid);
3843 err = -EINVAL;
3844 goto abort_unlock;
3845 }
3846
3847 done_unlock:
3848 abort_unlock:
3849 mddev_unlock(mddev);
3850
3851 return err;
3852 done:
3853 if (err)
3854 MD_BUG();
3855 abort:
3856 return err;
3857 }
3858
3859 static int md_open(struct inode *inode, struct file *file)
3860 {
3861 /*
3862 * Succeed if we can lock the mddev, which confirms that
3863 * it isn't being stopped right now.
3864 */
3865 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3866 int err;
3867
3868 if ((err = mddev_lock(mddev)))
3869 goto out;
3870
3871 err = 0;
3872 mddev_get(mddev);
3873 mddev_unlock(mddev);
3874
3875 check_disk_change(inode->i_bdev);
3876 out:
3877 return err;
3878 }
3879
3880 static int md_release(struct inode *inode, struct file * file)
3881 {
3882 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3883
3884 if (!mddev)
3885 BUG();
3886 mddev_put(mddev);
3887
3888 return 0;
3889 }
3890
3891 static int md_media_changed(struct gendisk *disk)
3892 {
3893 mddev_t *mddev = disk->private_data;
3894
3895 return mddev->changed;
3896 }
3897
3898 static int md_revalidate(struct gendisk *disk)
3899 {
3900 mddev_t *mddev = disk->private_data;
3901
3902 mddev->changed = 0;
3903 return 0;
3904 }
3905 static struct block_device_operations md_fops =
3906 {
3907 .owner = THIS_MODULE,
3908 .open = md_open,
3909 .release = md_release,
3910 .ioctl = md_ioctl,
3911 .getgeo = md_getgeo,
3912 .media_changed = md_media_changed,
3913 .revalidate_disk= md_revalidate,
3914 };
3915
3916 static int md_thread(void * arg)
3917 {
3918 mdk_thread_t *thread = arg;
3919
3920 /*
3921 * md_thread is a 'system-thread', it's priority should be very
3922 * high. We avoid resource deadlocks individually in each
3923 * raid personality. (RAID5 does preallocation) We also use RR and
3924 * the very same RT priority as kswapd, thus we will never get
3925 * into a priority inversion deadlock.
3926 *
3927 * we definitely have to have equal or higher priority than
3928 * bdflush, otherwise bdflush will deadlock if there are too
3929 * many dirty RAID5 blocks.
3930 */
3931
3932 allow_signal(SIGKILL);
3933 while (!kthread_should_stop()) {
3934
3935 /* We need to wait INTERRUPTIBLE so that
3936 * we don't add to the load-average.
3937 * That means we need to be sure no signals are
3938 * pending
3939 */
3940 if (signal_pending(current))
3941 flush_signals(current);
3942
3943 wait_event_interruptible_timeout
3944 (thread->wqueue,
3945 test_bit(THREAD_WAKEUP, &thread->flags)
3946 || kthread_should_stop(),
3947 thread->timeout);
3948 try_to_freeze();
3949
3950 clear_bit(THREAD_WAKEUP, &thread->flags);
3951
3952 thread->run(thread->mddev);
3953 }
3954
3955 return 0;
3956 }
3957
3958 void md_wakeup_thread(mdk_thread_t *thread)
3959 {
3960 if (thread) {
3961 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
3962 set_bit(THREAD_WAKEUP, &thread->flags);
3963 wake_up(&thread->wqueue);
3964 }
3965 }
3966
3967 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
3968 const char *name)
3969 {
3970 mdk_thread_t *thread;
3971
3972 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
3973 if (!thread)
3974 return NULL;
3975
3976 init_waitqueue_head(&thread->wqueue);
3977
3978 thread->run = run;
3979 thread->mddev = mddev;
3980 thread->timeout = MAX_SCHEDULE_TIMEOUT;
3981 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
3982 if (IS_ERR(thread->tsk)) {
3983 kfree(thread);
3984 return NULL;
3985 }
3986 return thread;
3987 }
3988
3989 void md_unregister_thread(mdk_thread_t *thread)
3990 {
3991 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
3992
3993 kthread_stop(thread->tsk);
3994 kfree(thread);
3995 }
3996
3997 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
3998 {
3999 if (!mddev) {
4000 MD_BUG();
4001 return;
4002 }
4003
4004 if (!rdev || test_bit(Faulty, &rdev->flags))
4005 return;
4006 /*
4007 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4008 mdname(mddev),
4009 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4010 __builtin_return_address(0),__builtin_return_address(1),
4011 __builtin_return_address(2),__builtin_return_address(3));
4012 */
4013 if (!mddev->pers->error_handler)
4014 return;
4015 mddev->pers->error_handler(mddev,rdev);
4016 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4017 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4018 md_wakeup_thread(mddev->thread);
4019 md_new_event(mddev);
4020 }
4021
4022 /* seq_file implementation /proc/mdstat */
4023
4024 static void status_unused(struct seq_file *seq)
4025 {
4026 int i = 0;
4027 mdk_rdev_t *rdev;
4028 struct list_head *tmp;
4029
4030 seq_printf(seq, "unused devices: ");
4031
4032 ITERATE_RDEV_PENDING(rdev,tmp) {
4033 char b[BDEVNAME_SIZE];
4034 i++;
4035 seq_printf(seq, "%s ",
4036 bdevname(rdev->bdev,b));
4037 }
4038 if (!i)
4039 seq_printf(seq, "<none>");
4040
4041 seq_printf(seq, "\n");
4042 }
4043
4044
4045 static void status_resync(struct seq_file *seq, mddev_t * mddev)
4046 {
4047 unsigned long max_blocks, resync, res, dt, db, rt;
4048
4049 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4050
4051 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4052 max_blocks = mddev->resync_max_sectors >> 1;
4053 else
4054 max_blocks = mddev->size;
4055
4056 /*
4057 * Should not happen.
4058 */
4059 if (!max_blocks) {
4060 MD_BUG();
4061 return;
4062 }
4063 res = (resync/1024)*1000/(max_blocks/1024 + 1);
4064 {
4065 int i, x = res/50, y = 20-x;
4066 seq_printf(seq, "[");
4067 for (i = 0; i < x; i++)
4068 seq_printf(seq, "=");
4069 seq_printf(seq, ">");
4070 for (i = 0; i < y; i++)
4071 seq_printf(seq, ".");
4072 seq_printf(seq, "] ");
4073 }
4074 seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)",
4075 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4076 "resync" : "recovery"),
4077 res/10, res % 10, resync, max_blocks);
4078
4079 /*
4080 * We do not want to overflow, so the order of operands and
4081 * the * 100 / 100 trick are important. We do a +1 to be
4082 * safe against division by zero. We only estimate anyway.
4083 *
4084 * dt: time from mark until now
4085 * db: blocks written from mark until now
4086 * rt: remaining time
4087 */
4088 dt = ((jiffies - mddev->resync_mark) / HZ);
4089 if (!dt) dt++;
4090 db = resync - (mddev->resync_mark_cnt/2);
4091 rt = (dt * ((max_blocks-resync) / (db/100+1)))/100;
4092
4093 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4094
4095 seq_printf(seq, " speed=%ldK/sec", db/dt);
4096 }
4097
4098 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4099 {
4100 struct list_head *tmp;
4101 loff_t l = *pos;
4102 mddev_t *mddev;
4103
4104 if (l >= 0x10000)
4105 return NULL;
4106 if (!l--)
4107 /* header */
4108 return (void*)1;
4109
4110 spin_lock(&all_mddevs_lock);
4111 list_for_each(tmp,&all_mddevs)
4112 if (!l--) {
4113 mddev = list_entry(tmp, mddev_t, all_mddevs);
4114 mddev_get(mddev);
4115 spin_unlock(&all_mddevs_lock);
4116 return mddev;
4117 }
4118 spin_unlock(&all_mddevs_lock);
4119 if (!l--)
4120 return (void*)2;/* tail */
4121 return NULL;
4122 }
4123
4124 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4125 {
4126 struct list_head *tmp;
4127 mddev_t *next_mddev, *mddev = v;
4128
4129 ++*pos;
4130 if (v == (void*)2)
4131 return NULL;
4132
4133 spin_lock(&all_mddevs_lock);
4134 if (v == (void*)1)
4135 tmp = all_mddevs.next;
4136 else
4137 tmp = mddev->all_mddevs.next;
4138 if (tmp != &all_mddevs)
4139 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4140 else {
4141 next_mddev = (void*)2;
4142 *pos = 0x10000;
4143 }
4144 spin_unlock(&all_mddevs_lock);
4145
4146 if (v != (void*)1)
4147 mddev_put(mddev);
4148 return next_mddev;
4149
4150 }
4151
4152 static void md_seq_stop(struct seq_file *seq, void *v)
4153 {
4154 mddev_t *mddev = v;
4155
4156 if (mddev && v != (void*)1 && v != (void*)2)
4157 mddev_put(mddev);
4158 }
4159
4160 struct mdstat_info {
4161 int event;
4162 };
4163
4164 static int md_seq_show(struct seq_file *seq, void *v)
4165 {
4166 mddev_t *mddev = v;
4167 sector_t size;
4168 struct list_head *tmp2;
4169 mdk_rdev_t *rdev;
4170 struct mdstat_info *mi = seq->private;
4171 struct bitmap *bitmap;
4172
4173 if (v == (void*)1) {
4174 struct mdk_personality *pers;
4175 seq_printf(seq, "Personalities : ");
4176 spin_lock(&pers_lock);
4177 list_for_each_entry(pers, &pers_list, list)
4178 seq_printf(seq, "[%s] ", pers->name);
4179
4180 spin_unlock(&pers_lock);
4181 seq_printf(seq, "\n");
4182 mi->event = atomic_read(&md_event_count);
4183 return 0;
4184 }
4185 if (v == (void*)2) {
4186 status_unused(seq);
4187 return 0;
4188 }
4189
4190 if (mddev_lock(mddev)!=0)
4191 return -EINTR;
4192 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4193 seq_printf(seq, "%s : %sactive", mdname(mddev),
4194 mddev->pers ? "" : "in");
4195 if (mddev->pers) {
4196 if (mddev->ro==1)
4197 seq_printf(seq, " (read-only)");
4198 if (mddev->ro==2)
4199 seq_printf(seq, "(auto-read-only)");
4200 seq_printf(seq, " %s", mddev->pers->name);
4201 }
4202
4203 size = 0;
4204 ITERATE_RDEV(mddev,rdev,tmp2) {
4205 char b[BDEVNAME_SIZE];
4206 seq_printf(seq, " %s[%d]",
4207 bdevname(rdev->bdev,b), rdev->desc_nr);
4208 if (test_bit(WriteMostly, &rdev->flags))
4209 seq_printf(seq, "(W)");
4210 if (test_bit(Faulty, &rdev->flags)) {
4211 seq_printf(seq, "(F)");
4212 continue;
4213 } else if (rdev->raid_disk < 0)
4214 seq_printf(seq, "(S)"); /* spare */
4215 size += rdev->size;
4216 }
4217
4218 if (!list_empty(&mddev->disks)) {
4219 if (mddev->pers)
4220 seq_printf(seq, "\n %llu blocks",
4221 (unsigned long long)mddev->array_size);
4222 else
4223 seq_printf(seq, "\n %llu blocks",
4224 (unsigned long long)size);
4225 }
4226 if (mddev->persistent) {
4227 if (mddev->major_version != 0 ||
4228 mddev->minor_version != 90) {
4229 seq_printf(seq," super %d.%d",
4230 mddev->major_version,
4231 mddev->minor_version);
4232 }
4233 } else
4234 seq_printf(seq, " super non-persistent");
4235
4236 if (mddev->pers) {
4237 mddev->pers->status (seq, mddev);
4238 seq_printf(seq, "\n ");
4239 if (mddev->pers->sync_request) {
4240 if (mddev->curr_resync > 2) {
4241 status_resync (seq, mddev);
4242 seq_printf(seq, "\n ");
4243 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4244 seq_printf(seq, "\tresync=DELAYED\n ");
4245 else if (mddev->recovery_cp < MaxSector)
4246 seq_printf(seq, "\tresync=PENDING\n ");
4247 }
4248 } else
4249 seq_printf(seq, "\n ");
4250
4251 if ((bitmap = mddev->bitmap)) {
4252 unsigned long chunk_kb;
4253 unsigned long flags;
4254 spin_lock_irqsave(&bitmap->lock, flags);
4255 chunk_kb = bitmap->chunksize >> 10;
4256 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
4257 "%lu%s chunk",
4258 bitmap->pages - bitmap->missing_pages,
4259 bitmap->pages,
4260 (bitmap->pages - bitmap->missing_pages)
4261 << (PAGE_SHIFT - 10),
4262 chunk_kb ? chunk_kb : bitmap->chunksize,
4263 chunk_kb ? "KB" : "B");
4264 if (bitmap->file) {
4265 seq_printf(seq, ", file: ");
4266 seq_path(seq, bitmap->file->f_vfsmnt,
4267 bitmap->file->f_dentry," \t\n");
4268 }
4269
4270 seq_printf(seq, "\n");
4271 spin_unlock_irqrestore(&bitmap->lock, flags);
4272 }
4273
4274 seq_printf(seq, "\n");
4275 }
4276 mddev_unlock(mddev);
4277
4278 return 0;
4279 }
4280
4281 static struct seq_operations md_seq_ops = {
4282 .start = md_seq_start,
4283 .next = md_seq_next,
4284 .stop = md_seq_stop,
4285 .show = md_seq_show,
4286 };
4287
4288 static int md_seq_open(struct inode *inode, struct file *file)
4289 {
4290 int error;
4291 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
4292 if (mi == NULL)
4293 return -ENOMEM;
4294
4295 error = seq_open(file, &md_seq_ops);
4296 if (error)
4297 kfree(mi);
4298 else {
4299 struct seq_file *p = file->private_data;
4300 p->private = mi;
4301 mi->event = atomic_read(&md_event_count);
4302 }
4303 return error;
4304 }
4305
4306 static int md_seq_release(struct inode *inode, struct file *file)
4307 {
4308 struct seq_file *m = file->private_data;
4309 struct mdstat_info *mi = m->private;
4310 m->private = NULL;
4311 kfree(mi);
4312 return seq_release(inode, file);
4313 }
4314
4315 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
4316 {
4317 struct seq_file *m = filp->private_data;
4318 struct mdstat_info *mi = m->private;
4319 int mask;
4320
4321 poll_wait(filp, &md_event_waiters, wait);
4322
4323 /* always allow read */
4324 mask = POLLIN | POLLRDNORM;
4325
4326 if (mi->event != atomic_read(&md_event_count))
4327 mask |= POLLERR | POLLPRI;
4328 return mask;
4329 }
4330
4331 static struct file_operations md_seq_fops = {
4332 .open = md_seq_open,
4333 .read = seq_read,
4334 .llseek = seq_lseek,
4335 .release = md_seq_release,
4336 .poll = mdstat_poll,
4337 };
4338
4339 int register_md_personality(struct mdk_personality *p)
4340 {
4341 spin_lock(&pers_lock);
4342 list_add_tail(&p->list, &pers_list);
4343 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
4344 spin_unlock(&pers_lock);
4345 return 0;
4346 }
4347
4348 int unregister_md_personality(struct mdk_personality *p)
4349 {
4350 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
4351 spin_lock(&pers_lock);
4352 list_del_init(&p->list);
4353 spin_unlock(&pers_lock);
4354 return 0;
4355 }
4356
4357 static int is_mddev_idle(mddev_t *mddev)
4358 {
4359 mdk_rdev_t * rdev;
4360 struct list_head *tmp;
4361 int idle;
4362 unsigned long curr_events;
4363
4364 idle = 1;
4365 ITERATE_RDEV(mddev,rdev,tmp) {
4366 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
4367 curr_events = disk_stat_read(disk, sectors[0]) +
4368 disk_stat_read(disk, sectors[1]) -
4369 atomic_read(&disk->sync_io);
4370 /* The difference between curr_events and last_events
4371 * will be affected by any new non-sync IO (making
4372 * curr_events bigger) and any difference in the amount of
4373 * in-flight syncio (making current_events bigger or smaller)
4374 * The amount in-flight is currently limited to
4375 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4376 * which is at most 4096 sectors.
4377 * These numbers are fairly fragile and should be made
4378 * more robust, probably by enforcing the
4379 * 'window size' that md_do_sync sort-of uses.
4380 *
4381 * Note: the following is an unsigned comparison.
4382 */
4383 if ((curr_events - rdev->last_events + 4096) > 8192) {
4384 rdev->last_events = curr_events;
4385 idle = 0;
4386 }
4387 }
4388 return idle;
4389 }
4390
4391 void md_done_sync(mddev_t *mddev, int blocks, int ok)
4392 {
4393 /* another "blocks" (512byte) blocks have been synced */
4394 atomic_sub(blocks, &mddev->recovery_active);
4395 wake_up(&mddev->recovery_wait);
4396 if (!ok) {
4397 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4398 md_wakeup_thread(mddev->thread);
4399 // stop recovery, signal do_sync ....
4400 }
4401 }
4402
4403
4404 /* md_write_start(mddev, bi)
4405 * If we need to update some array metadata (e.g. 'active' flag
4406 * in superblock) before writing, schedule a superblock update
4407 * and wait for it to complete.
4408 */
4409 void md_write_start(mddev_t *mddev, struct bio *bi)
4410 {
4411 if (bio_data_dir(bi) != WRITE)
4412 return;
4413
4414 BUG_ON(mddev->ro == 1);
4415 if (mddev->ro == 2) {
4416 /* need to switch to read/write */
4417 mddev->ro = 0;
4418 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4419 md_wakeup_thread(mddev->thread);
4420 }
4421 atomic_inc(&mddev->writes_pending);
4422 if (mddev->in_sync) {
4423 spin_lock_irq(&mddev->write_lock);
4424 if (mddev->in_sync) {
4425 mddev->in_sync = 0;
4426 mddev->sb_dirty = 1;
4427 md_wakeup_thread(mddev->thread);
4428 }
4429 spin_unlock_irq(&mddev->write_lock);
4430 }
4431 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
4432 }
4433
4434 void md_write_end(mddev_t *mddev)
4435 {
4436 if (atomic_dec_and_test(&mddev->writes_pending)) {
4437 if (mddev->safemode == 2)
4438 md_wakeup_thread(mddev->thread);
4439 else
4440 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
4441 }
4442 }
4443
4444 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
4445
4446 #define SYNC_MARKS 10
4447 #define SYNC_MARK_STEP (3*HZ)
4448 static void md_do_sync(mddev_t *mddev)
4449 {
4450 mddev_t *mddev2;
4451 unsigned int currspeed = 0,
4452 window;
4453 sector_t max_sectors,j, io_sectors;
4454 unsigned long mark[SYNC_MARKS];
4455 sector_t mark_cnt[SYNC_MARKS];
4456 int last_mark,m;
4457 struct list_head *tmp;
4458 sector_t last_check;
4459 int skipped = 0;
4460
4461 /* just incase thread restarts... */
4462 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
4463 return;
4464
4465 /* we overload curr_resync somewhat here.
4466 * 0 == not engaged in resync at all
4467 * 2 == checking that there is no conflict with another sync
4468 * 1 == like 2, but have yielded to allow conflicting resync to
4469 * commense
4470 * other == active in resync - this many blocks
4471 *
4472 * Before starting a resync we must have set curr_resync to
4473 * 2, and then checked that every "conflicting" array has curr_resync
4474 * less than ours. When we find one that is the same or higher
4475 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
4476 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
4477 * This will mean we have to start checking from the beginning again.
4478 *
4479 */
4480
4481 do {
4482 mddev->curr_resync = 2;
4483
4484 try_again:
4485 if (kthread_should_stop()) {
4486 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4487 goto skip;
4488 }
4489 ITERATE_MDDEV(mddev2,tmp) {
4490 if (mddev2 == mddev)
4491 continue;
4492 if (mddev2->curr_resync &&
4493 match_mddev_units(mddev,mddev2)) {
4494 DEFINE_WAIT(wq);
4495 if (mddev < mddev2 && mddev->curr_resync == 2) {
4496 /* arbitrarily yield */
4497 mddev->curr_resync = 1;
4498 wake_up(&resync_wait);
4499 }
4500 if (mddev > mddev2 && mddev->curr_resync == 1)
4501 /* no need to wait here, we can wait the next
4502 * time 'round when curr_resync == 2
4503 */
4504 continue;
4505 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
4506 if (!kthread_should_stop() &&
4507 mddev2->curr_resync >= mddev->curr_resync) {
4508 printk(KERN_INFO "md: delaying resync of %s"
4509 " until %s has finished resync (they"
4510 " share one or more physical units)\n",
4511 mdname(mddev), mdname(mddev2));
4512 mddev_put(mddev2);
4513 schedule();
4514 finish_wait(&resync_wait, &wq);
4515 goto try_again;
4516 }
4517 finish_wait(&resync_wait, &wq);
4518 }
4519 }
4520 } while (mddev->curr_resync < 2);
4521
4522 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
4523 /* resync follows the size requested by the personality,
4524 * which defaults to physical size, but can be virtual size
4525 */
4526 max_sectors = mddev->resync_max_sectors;
4527 mddev->resync_mismatches = 0;
4528 } else
4529 /* recovery follows the physical size of devices */
4530 max_sectors = mddev->size << 1;
4531
4532 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
4533 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
4534 " %d KB/sec/disc.\n", speed_min(mddev));
4535 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
4536 "(but not more than %d KB/sec) for reconstruction.\n",
4537 speed_max(mddev));
4538
4539 is_mddev_idle(mddev); /* this also initializes IO event counters */
4540 /* we don't use the checkpoint if there's a bitmap */
4541 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap
4542 && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
4543 j = mddev->recovery_cp;
4544 else
4545 j = 0;
4546 io_sectors = 0;
4547 for (m = 0; m < SYNC_MARKS; m++) {
4548 mark[m] = jiffies;
4549 mark_cnt[m] = io_sectors;
4550 }
4551 last_mark = 0;
4552 mddev->resync_mark = mark[last_mark];
4553 mddev->resync_mark_cnt = mark_cnt[last_mark];
4554
4555 /*
4556 * Tune reconstruction:
4557 */
4558 window = 32*(PAGE_SIZE/512);
4559 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
4560 window/2,(unsigned long long) max_sectors/2);
4561
4562 atomic_set(&mddev->recovery_active, 0);
4563 init_waitqueue_head(&mddev->recovery_wait);
4564 last_check = 0;
4565
4566 if (j>2) {
4567 printk(KERN_INFO
4568 "md: resuming recovery of %s from checkpoint.\n",
4569 mdname(mddev));
4570 mddev->curr_resync = j;
4571 }
4572
4573 while (j < max_sectors) {
4574 sector_t sectors;
4575
4576 skipped = 0;
4577 sectors = mddev->pers->sync_request(mddev, j, &skipped,
4578 currspeed < speed_min(mddev));
4579 if (sectors == 0) {
4580 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4581 goto out;
4582 }
4583
4584 if (!skipped) { /* actual IO requested */
4585 io_sectors += sectors;
4586 atomic_add(sectors, &mddev->recovery_active);
4587 }
4588
4589 j += sectors;
4590 if (j>1) mddev->curr_resync = j;
4591 if (last_check == 0)
4592 /* this is the earliers that rebuilt will be
4593 * visible in /proc/mdstat
4594 */
4595 md_new_event(mddev);
4596
4597 if (last_check + window > io_sectors || j == max_sectors)
4598 continue;
4599
4600 last_check = io_sectors;
4601
4602 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
4603 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
4604 break;
4605
4606 repeat:
4607 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
4608 /* step marks */
4609 int next = (last_mark+1) % SYNC_MARKS;
4610
4611 mddev->resync_mark = mark[next];
4612 mddev->resync_mark_cnt = mark_cnt[next];
4613 mark[next] = jiffies;
4614 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
4615 last_mark = next;
4616 }
4617
4618
4619 if (kthread_should_stop()) {
4620 /*
4621 * got a signal, exit.
4622 */
4623 printk(KERN_INFO
4624 "md: md_do_sync() got signal ... exiting\n");
4625 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4626 goto out;
4627 }
4628
4629 /*
4630 * this loop exits only if either when we are slower than
4631 * the 'hard' speed limit, or the system was IO-idle for
4632 * a jiffy.
4633 * the system might be non-idle CPU-wise, but we only care
4634 * about not overloading the IO subsystem. (things like an
4635 * e2fsck being done on the RAID array should execute fast)
4636 */
4637 mddev->queue->unplug_fn(mddev->queue);
4638 cond_resched();
4639
4640 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
4641 /((jiffies-mddev->resync_mark)/HZ +1) +1;
4642
4643 if (currspeed > speed_min(mddev)) {
4644 if ((currspeed > speed_max(mddev)) ||
4645 !is_mddev_idle(mddev)) {
4646 msleep(500);
4647 goto repeat;
4648 }
4649 }
4650 }
4651 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
4652 /*
4653 * this also signals 'finished resyncing' to md_stop
4654 */
4655 out:
4656 mddev->queue->unplug_fn(mddev->queue);
4657
4658 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
4659
4660 /* tell personality that we are finished */
4661 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
4662
4663 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4664 mddev->curr_resync > 2 &&
4665 mddev->curr_resync >= mddev->recovery_cp) {
4666 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4667 printk(KERN_INFO
4668 "md: checkpointing recovery of %s.\n",
4669 mdname(mddev));
4670 mddev->recovery_cp = mddev->curr_resync;
4671 } else
4672 mddev->recovery_cp = MaxSector;
4673 }
4674
4675 skip:
4676 mddev->curr_resync = 0;
4677 wake_up(&resync_wait);
4678 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
4679 md_wakeup_thread(mddev->thread);
4680 }
4681
4682
4683 /*
4684 * This routine is regularly called by all per-raid-array threads to
4685 * deal with generic issues like resync and super-block update.
4686 * Raid personalities that don't have a thread (linear/raid0) do not
4687 * need this as they never do any recovery or update the superblock.
4688 *
4689 * It does not do any resync itself, but rather "forks" off other threads
4690 * to do that as needed.
4691 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4692 * "->recovery" and create a thread at ->sync_thread.
4693 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4694 * and wakeups up this thread which will reap the thread and finish up.
4695 * This thread also removes any faulty devices (with nr_pending == 0).
4696 *
4697 * The overall approach is:
4698 * 1/ if the superblock needs updating, update it.
4699 * 2/ If a recovery thread is running, don't do anything else.
4700 * 3/ If recovery has finished, clean up, possibly marking spares active.
4701 * 4/ If there are any faulty devices, remove them.
4702 * 5/ If array is degraded, try to add spares devices
4703 * 6/ If array has spares or is not in-sync, start a resync thread.
4704 */
4705 void md_check_recovery(mddev_t *mddev)
4706 {
4707 mdk_rdev_t *rdev;
4708 struct list_head *rtmp;
4709
4710
4711 if (mddev->bitmap)
4712 bitmap_daemon_work(mddev->bitmap);
4713
4714 if (mddev->ro)
4715 return;
4716
4717 if (signal_pending(current)) {
4718 if (mddev->pers->sync_request) {
4719 printk(KERN_INFO "md: %s in immediate safe mode\n",
4720 mdname(mddev));
4721 mddev->safemode = 2;
4722 }
4723 flush_signals(current);
4724 }
4725
4726 if ( ! (
4727 mddev->sb_dirty ||
4728 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
4729 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
4730 (mddev->safemode == 1) ||
4731 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
4732 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
4733 ))
4734 return;
4735
4736 if (mddev_trylock(mddev)==0) {
4737 int spares =0;
4738
4739 spin_lock_irq(&mddev->write_lock);
4740 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
4741 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
4742 mddev->in_sync = 1;
4743 mddev->sb_dirty = 1;
4744 }
4745 if (mddev->safemode == 1)
4746 mddev->safemode = 0;
4747 spin_unlock_irq(&mddev->write_lock);
4748
4749 if (mddev->sb_dirty)
4750 md_update_sb(mddev);
4751
4752
4753 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4754 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
4755 /* resync/recovery still happening */
4756 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4757 goto unlock;
4758 }
4759 if (mddev->sync_thread) {
4760 /* resync has finished, collect result */
4761 md_unregister_thread(mddev->sync_thread);
4762 mddev->sync_thread = NULL;
4763 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4764 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4765 /* success...*/
4766 /* activate any spares */
4767 mddev->pers->spare_active(mddev);
4768 }
4769 md_update_sb(mddev);
4770
4771 /* if array is no-longer degraded, then any saved_raid_disk
4772 * information must be scrapped
4773 */
4774 if (!mddev->degraded)
4775 ITERATE_RDEV(mddev,rdev,rtmp)
4776 rdev->saved_raid_disk = -1;
4777
4778 mddev->recovery = 0;
4779 /* flag recovery needed just to double check */
4780 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4781 md_new_event(mddev);
4782 goto unlock;
4783 }
4784 /* Clear some bits that don't mean anything, but
4785 * might be left set
4786 */
4787 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4788 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
4789 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
4790 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
4791
4792 /* no recovery is running.
4793 * remove any failed drives, then
4794 * add spares if possible.
4795 * Spare are also removed and re-added, to allow
4796 * the personality to fail the re-add.
4797 */
4798 ITERATE_RDEV(mddev,rdev,rtmp)
4799 if (rdev->raid_disk >= 0 &&
4800 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
4801 atomic_read(&rdev->nr_pending)==0) {
4802 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
4803 char nm[20];
4804 sprintf(nm,"rd%d", rdev->raid_disk);
4805 sysfs_remove_link(&mddev->kobj, nm);
4806 rdev->raid_disk = -1;
4807 }
4808 }
4809
4810 if (mddev->degraded) {
4811 ITERATE_RDEV(mddev,rdev,rtmp)
4812 if (rdev->raid_disk < 0
4813 && !test_bit(Faulty, &rdev->flags)) {
4814 if (mddev->pers->hot_add_disk(mddev,rdev)) {
4815 char nm[20];
4816 sprintf(nm, "rd%d", rdev->raid_disk);
4817 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
4818 spares++;
4819 md_new_event(mddev);
4820 } else
4821 break;
4822 }
4823 }
4824
4825 if (spares) {
4826 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4827 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4828 } else if (mddev->recovery_cp < MaxSector) {
4829 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4830 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4831 /* nothing to be done ... */
4832 goto unlock;
4833
4834 if (mddev->pers->sync_request) {
4835 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
4836 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
4837 /* We are adding a device or devices to an array
4838 * which has the bitmap stored on all devices.
4839 * So make sure all bitmap pages get written
4840 */
4841 bitmap_write_all(mddev->bitmap);
4842 }
4843 mddev->sync_thread = md_register_thread(md_do_sync,
4844 mddev,
4845 "%s_resync");
4846 if (!mddev->sync_thread) {
4847 printk(KERN_ERR "%s: could not start resync"
4848 " thread...\n",
4849 mdname(mddev));
4850 /* leave the spares where they are, it shouldn't hurt */
4851 mddev->recovery = 0;
4852 } else
4853 md_wakeup_thread(mddev->sync_thread);
4854 md_new_event(mddev);
4855 }
4856 unlock:
4857 mddev_unlock(mddev);
4858 }
4859 }
4860
4861 static int md_notify_reboot(struct notifier_block *this,
4862 unsigned long code, void *x)
4863 {
4864 struct list_head *tmp;
4865 mddev_t *mddev;
4866
4867 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
4868
4869 printk(KERN_INFO "md: stopping all md devices.\n");
4870
4871 ITERATE_MDDEV(mddev,tmp)
4872 if (mddev_trylock(mddev)==0)
4873 do_md_stop (mddev, 1);
4874 /*
4875 * certain more exotic SCSI devices are known to be
4876 * volatile wrt too early system reboots. While the
4877 * right place to handle this issue is the given
4878 * driver, we do want to have a safe RAID driver ...
4879 */
4880 mdelay(1000*1);
4881 }
4882 return NOTIFY_DONE;
4883 }
4884
4885 static struct notifier_block md_notifier = {
4886 .notifier_call = md_notify_reboot,
4887 .next = NULL,
4888 .priority = INT_MAX, /* before any real devices */
4889 };
4890
4891 static void md_geninit(void)
4892 {
4893 struct proc_dir_entry *p;
4894
4895 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
4896
4897 p = create_proc_entry("mdstat", S_IRUGO, NULL);
4898 if (p)
4899 p->proc_fops = &md_seq_fops;
4900 }
4901
4902 static int __init md_init(void)
4903 {
4904 int minor;
4905
4906 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4907 " MD_SB_DISKS=%d\n",
4908 MD_MAJOR_VERSION, MD_MINOR_VERSION,
4909 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
4910 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
4911 BITMAP_MINOR);
4912
4913 if (register_blkdev(MAJOR_NR, "md"))
4914 return -1;
4915 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
4916 unregister_blkdev(MAJOR_NR, "md");
4917 return -1;
4918 }
4919 devfs_mk_dir("md");
4920 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
4921 md_probe, NULL, NULL);
4922 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
4923 md_probe, NULL, NULL);
4924
4925 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4926 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
4927 S_IFBLK|S_IRUSR|S_IWUSR,
4928 "md/%d", minor);
4929
4930 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4931 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
4932 S_IFBLK|S_IRUSR|S_IWUSR,
4933 "md/mdp%d", minor);
4934
4935
4936 register_reboot_notifier(&md_notifier);
4937 raid_table_header = register_sysctl_table(raid_root_table, 1);
4938
4939 md_geninit();
4940 return (0);
4941 }
4942
4943
4944 #ifndef MODULE
4945
4946 /*
4947 * Searches all registered partitions for autorun RAID arrays
4948 * at boot time.
4949 */
4950 static dev_t detected_devices[128];
4951 static int dev_cnt;
4952
4953 void md_autodetect_dev(dev_t dev)
4954 {
4955 if (dev_cnt >= 0 && dev_cnt < 127)
4956 detected_devices[dev_cnt++] = dev;
4957 }
4958
4959
4960 static void autostart_arrays(int part)
4961 {
4962 mdk_rdev_t *rdev;
4963 int i;
4964
4965 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
4966
4967 for (i = 0; i < dev_cnt; i++) {
4968 dev_t dev = detected_devices[i];
4969
4970 rdev = md_import_device(dev,0, 0);
4971 if (IS_ERR(rdev))
4972 continue;
4973
4974 if (test_bit(Faulty, &rdev->flags)) {
4975 MD_BUG();
4976 continue;
4977 }
4978 list_add(&rdev->same_set, &pending_raid_disks);
4979 }
4980 dev_cnt = 0;
4981
4982 autorun_devices(part);
4983 }
4984
4985 #endif
4986
4987 static __exit void md_exit(void)
4988 {
4989 mddev_t *mddev;
4990 struct list_head *tmp;
4991 int i;
4992 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
4993 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
4994 for (i=0; i < MAX_MD_DEVS; i++)
4995 devfs_remove("md/%d", i);
4996 for (i=0; i < MAX_MD_DEVS; i++)
4997 devfs_remove("md/d%d", i);
4998
4999 devfs_remove("md");
5000
5001 unregister_blkdev(MAJOR_NR,"md");
5002 unregister_blkdev(mdp_major, "mdp");
5003 unregister_reboot_notifier(&md_notifier);
5004 unregister_sysctl_table(raid_table_header);
5005 remove_proc_entry("mdstat", NULL);
5006 ITERATE_MDDEV(mddev,tmp) {
5007 struct gendisk *disk = mddev->gendisk;
5008 if (!disk)
5009 continue;
5010 export_array(mddev);
5011 del_gendisk(disk);
5012 put_disk(disk);
5013 mddev->gendisk = NULL;
5014 mddev_put(mddev);
5015 }
5016 }
5017
5018 module_init(md_init)
5019 module_exit(md_exit)
5020
5021 static int get_ro(char *buffer, struct kernel_param *kp)
5022 {
5023 return sprintf(buffer, "%d", start_readonly);
5024 }
5025 static int set_ro(const char *val, struct kernel_param *kp)
5026 {
5027 char *e;
5028 int num = simple_strtoul(val, &e, 10);
5029 if (*val && (*e == '\0' || *e == '\n')) {
5030 start_readonly = num;
5031 return 0;
5032 }
5033 return -EINVAL;
5034 }
5035
5036 module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
5037 module_param(start_dirty_degraded, int, 0644);
5038
5039
5040 EXPORT_SYMBOL(register_md_personality);
5041 EXPORT_SYMBOL(unregister_md_personality);
5042 EXPORT_SYMBOL(md_error);
5043 EXPORT_SYMBOL(md_done_sync);
5044 EXPORT_SYMBOL(md_write_start);
5045 EXPORT_SYMBOL(md_write_end);
5046 EXPORT_SYMBOL(md_register_thread);
5047 EXPORT_SYMBOL(md_unregister_thread);
5048 EXPORT_SYMBOL(md_wakeup_thread);
5049 EXPORT_SYMBOL(md_print_devices);
5050 EXPORT_SYMBOL(md_check_recovery);
5051 MODULE_LICENSE("GPL");
5052 MODULE_ALIAS("md");
5053 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
Support for the Chinese Samsung S3C2440 based development boards