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md: tidy up status_resync to handle large arrays.
[linux-2.6/mini2440.git] / drivers / md / md.c
blob5eb01a4d27ba53e14e2601f297dca45ff56fab2a
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/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
39 #include <linux/buffer_head.h> /* for invalidate_bdev */
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/hdreg.h>
43 #include <linux/proc_fs.h>
44 #include <linux/random.h>
45 #include <linux/reboot.h>
46 #include <linux/file.h>
47 #include <linux/delay.h>
48 #include <linux/raid/md_p.h>
49 #include <linux/raid/md_u.h>
50 #include "md.h"
51 #include "bitmap.h"
52
53 #define DEBUG 0
54 #define dprintk(x...) ((void)(DEBUG && printk(x)))
55
56
57 #ifndef MODULE
58 static void autostart_arrays(int part);
59 #endif
60
61 static LIST_HEAD(pers_list);
62 static DEFINE_SPINLOCK(pers_lock);
63
64 static void md_print_devices(void);
65
66 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
67
68 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
69
70 /*
71 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
72 * is 1000 KB/sec, so the extra system load does not show up that much.
73 * Increase it if you want to have more _guaranteed_ speed. Note that
74 * the RAID driver will use the maximum available bandwidth if the IO
75 * subsystem is idle. There is also an 'absolute maximum' reconstruction
76 * speed limit - in case reconstruction slows down your system despite
77 * idle IO detection.
78 *
79 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
80 * or /sys/block/mdX/md/sync_speed_{min,max}
81 */
82
83 static int sysctl_speed_limit_min = 1000;
84 static int sysctl_speed_limit_max = 200000;
85 static inline int speed_min(mddev_t *mddev)
86 {
87 return mddev->sync_speed_min ?
88 mddev->sync_speed_min : sysctl_speed_limit_min;
89 }
90
91 static inline int speed_max(mddev_t *mddev)
92 {
93 return mddev->sync_speed_max ?
94 mddev->sync_speed_max : sysctl_speed_limit_max;
95 }
96
97 static struct ctl_table_header *raid_table_header;
98
99 static ctl_table raid_table[] = {
100 {
101 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
102 .procname = "speed_limit_min",
103 .data = &sysctl_speed_limit_min,
104 .maxlen = sizeof(int),
105 .mode = S_IRUGO|S_IWUSR,
106 .proc_handler = &proc_dointvec,
107 },
108 {
109 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
110 .procname = "speed_limit_max",
111 .data = &sysctl_speed_limit_max,
112 .maxlen = sizeof(int),
113 .mode = S_IRUGO|S_IWUSR,
114 .proc_handler = &proc_dointvec,
115 },
116 { .ctl_name = 0 }
117 };
118
119 static ctl_table raid_dir_table[] = {
120 {
121 .ctl_name = DEV_RAID,
122 .procname = "raid",
123 .maxlen = 0,
124 .mode = S_IRUGO|S_IXUGO,
125 .child = raid_table,
126 },
127 { .ctl_name = 0 }
128 };
129
130 static ctl_table raid_root_table[] = {
131 {
132 .ctl_name = CTL_DEV,
133 .procname = "dev",
134 .maxlen = 0,
135 .mode = 0555,
136 .child = raid_dir_table,
137 },
138 { .ctl_name = 0 }
139 };
140
141 static struct block_device_operations md_fops;
142
143 static int start_readonly;
144
145 /*
146 * We have a system wide 'event count' that is incremented
147 * on any 'interesting' event, and readers of /proc/mdstat
148 * can use 'poll' or 'select' to find out when the event
149 * count increases.
150 *
151 * Events are:
152 * start array, stop array, error, add device, remove device,
153 * start build, activate spare
154 */
155 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
156 static atomic_t md_event_count;
157 void md_new_event(mddev_t *mddev)
158 {
159 atomic_inc(&md_event_count);
160 wake_up(&md_event_waiters);
161 }
162 EXPORT_SYMBOL_GPL(md_new_event);
163
164 /* Alternate version that can be called from interrupts
165 * when calling sysfs_notify isn't needed.
166 */
167 static void md_new_event_inintr(mddev_t *mddev)
168 {
169 atomic_inc(&md_event_count);
170 wake_up(&md_event_waiters);
171 }
172
173 /*
174 * Enables to iterate over all existing md arrays
175 * all_mddevs_lock protects this list.
176 */
177 static LIST_HEAD(all_mddevs);
178 static DEFINE_SPINLOCK(all_mddevs_lock);
179
180
181 /*
182 * iterates through all used mddevs in the system.
183 * We take care to grab the all_mddevs_lock whenever navigating
184 * the list, and to always hold a refcount when unlocked.
185 * Any code which breaks out of this loop while own
186 * a reference to the current mddev and must mddev_put it.
187 */
188 #define for_each_mddev(mddev,tmp) \
189 \
190 for (({ spin_lock(&all_mddevs_lock); \
191 tmp = all_mddevs.next; \
192 mddev = NULL;}); \
193 ({ if (tmp != &all_mddevs) \
194 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
195 spin_unlock(&all_mddevs_lock); \
196 if (mddev) mddev_put(mddev); \
197 mddev = list_entry(tmp, mddev_t, all_mddevs); \
198 tmp != &all_mddevs;}); \
199 ({ spin_lock(&all_mddevs_lock); \
200 tmp = tmp->next;}) \
201 )
202
203
204 /* Rather than calling directly into the personality make_request function,
205 * IO requests come here first so that we can check if the device is
206 * being suspended pending a reconfiguration.
207 * We hold a refcount over the call to ->make_request. By the time that
208 * call has finished, the bio has been linked into some internal structure
209 * and so is visible to ->quiesce(), so we don't need the refcount any more.
210 */
211 static int md_make_request(struct request_queue *q, struct bio *bio)
212 {
213 mddev_t *mddev = q->queuedata;
214 int rv;
215 if (mddev == NULL || mddev->pers == NULL) {
216 bio_io_error(bio);
217 return 0;
218 }
219 rcu_read_lock();
220 if (mddev->suspended) {
221 DEFINE_WAIT(__wait);
222 for (;;) {
223 prepare_to_wait(&mddev->sb_wait, &__wait,
224 TASK_UNINTERRUPTIBLE);
225 if (!mddev->suspended)
226 break;
227 rcu_read_unlock();
228 schedule();
229 rcu_read_lock();
230 }
231 finish_wait(&mddev->sb_wait, &__wait);
232 }
233 atomic_inc(&mddev->active_io);
234 rcu_read_unlock();
235 rv = mddev->pers->make_request(q, bio);
236 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
237 wake_up(&mddev->sb_wait);
238
239 return rv;
240 }
241
242 static void mddev_suspend(mddev_t *mddev)
243 {
244 BUG_ON(mddev->suspended);
245 mddev->suspended = 1;
246 synchronize_rcu();
247 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
248 mddev->pers->quiesce(mddev, 1);
249 md_unregister_thread(mddev->thread);
250 mddev->thread = NULL;
251 /* we now know that no code is executing in the personality module,
252 * except possibly the tail end of a ->bi_end_io function, but that
253 * is certain to complete before the module has a chance to get
254 * unloaded
255 */
256 }
257
258 static void mddev_resume(mddev_t *mddev)
259 {
260 mddev->suspended = 0;
261 wake_up(&mddev->sb_wait);
262 mddev->pers->quiesce(mddev, 0);
263 }
264
265
266 static inline mddev_t *mddev_get(mddev_t *mddev)
267 {
268 atomic_inc(&mddev->active);
269 return mddev;
270 }
271
272 static void mddev_delayed_delete(struct work_struct *ws);
273
274 static void mddev_put(mddev_t *mddev)
275 {
276 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
277 return;
278 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
279 !mddev->hold_active) {
280 list_del(&mddev->all_mddevs);
281 if (mddev->gendisk) {
282 /* we did a probe so need to clean up.
283 * Call schedule_work inside the spinlock
284 * so that flush_scheduled_work() after
285 * mddev_find will succeed in waiting for the
286 * work to be done.
287 */
288 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
289 schedule_work(&mddev->del_work);
290 } else
291 kfree(mddev);
292 }
293 spin_unlock(&all_mddevs_lock);
294 }
295
296 static mddev_t * mddev_find(dev_t unit)
297 {
298 mddev_t *mddev, *new = NULL;
299
300 retry:
301 spin_lock(&all_mddevs_lock);
302
303 if (unit) {
304 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
305 if (mddev->unit == unit) {
306 mddev_get(mddev);
307 spin_unlock(&all_mddevs_lock);
308 kfree(new);
309 return mddev;
310 }
311
312 if (new) {
313 list_add(&new->all_mddevs, &all_mddevs);
314 spin_unlock(&all_mddevs_lock);
315 new->hold_active = UNTIL_IOCTL;
316 return new;
317 }
318 } else if (new) {
319 /* find an unused unit number */
320 static int next_minor = 512;
321 int start = next_minor;
322 int is_free = 0;
323 int dev = 0;
324 while (!is_free) {
325 dev = MKDEV(MD_MAJOR, next_minor);
326 next_minor++;
327 if (next_minor > MINORMASK)
328 next_minor = 0;
329 if (next_minor == start) {
330 /* Oh dear, all in use. */
331 spin_unlock(&all_mddevs_lock);
332 kfree(new);
333 return NULL;
334 }
335
336 is_free = 1;
337 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
338 if (mddev->unit == dev) {
339 is_free = 0;
340 break;
341 }
342 }
343 new->unit = dev;
344 new->md_minor = MINOR(dev);
345 new->hold_active = UNTIL_STOP;
346 list_add(&new->all_mddevs, &all_mddevs);
347 spin_unlock(&all_mddevs_lock);
348 return new;
349 }
350 spin_unlock(&all_mddevs_lock);
351
352 new = kzalloc(sizeof(*new), GFP_KERNEL);
353 if (!new)
354 return NULL;
355
356 new->unit = unit;
357 if (MAJOR(unit) == MD_MAJOR)
358 new->md_minor = MINOR(unit);
359 else
360 new->md_minor = MINOR(unit) >> MdpMinorShift;
361
362 mutex_init(&new->reconfig_mutex);
363 INIT_LIST_HEAD(&new->disks);
364 INIT_LIST_HEAD(&new->all_mddevs);
365 init_timer(&new->safemode_timer);
366 atomic_set(&new->active, 1);
367 atomic_set(&new->openers, 0);
368 atomic_set(&new->active_io, 0);
369 spin_lock_init(&new->write_lock);
370 init_waitqueue_head(&new->sb_wait);
371 init_waitqueue_head(&new->recovery_wait);
372 new->reshape_position = MaxSector;
373 new->resync_min = 0;
374 new->resync_max = MaxSector;
375 new->level = LEVEL_NONE;
376
377 goto retry;
378 }
379
380 static inline int mddev_lock(mddev_t * mddev)
381 {
382 return mutex_lock_interruptible(&mddev->reconfig_mutex);
383 }
384
385 static inline int mddev_is_locked(mddev_t *mddev)
386 {
387 return mutex_is_locked(&mddev->reconfig_mutex);
388 }
389
390 static inline int mddev_trylock(mddev_t * mddev)
391 {
392 return mutex_trylock(&mddev->reconfig_mutex);
393 }
394
395 static inline void mddev_unlock(mddev_t * mddev)
396 {
397 mutex_unlock(&mddev->reconfig_mutex);
398
399 md_wakeup_thread(mddev->thread);
400 }
401
402 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
403 {
404 mdk_rdev_t *rdev;
405
406 list_for_each_entry(rdev, &mddev->disks, same_set)
407 if (rdev->desc_nr == nr)
408 return rdev;
409
410 return NULL;
411 }
412
413 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
414 {
415 mdk_rdev_t *rdev;
416
417 list_for_each_entry(rdev, &mddev->disks, same_set)
418 if (rdev->bdev->bd_dev == dev)
419 return rdev;
420
421 return NULL;
422 }
423
424 static struct mdk_personality *find_pers(int level, char *clevel)
425 {
426 struct mdk_personality *pers;
427 list_for_each_entry(pers, &pers_list, list) {
428 if (level != LEVEL_NONE && pers->level == level)
429 return pers;
430 if (strcmp(pers->name, clevel)==0)
431 return pers;
432 }
433 return NULL;
434 }
435
436 /* return the offset of the super block in 512byte sectors */
437 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
438 {
439 sector_t num_sectors = bdev->bd_inode->i_size / 512;
440 return MD_NEW_SIZE_SECTORS(num_sectors);
441 }
442
443 static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size)
444 {
445 sector_t num_sectors = rdev->sb_start;
446
447 if (chunk_size)
448 num_sectors &= ~((sector_t)chunk_size/512 - 1);
449 return num_sectors;
450 }
451
452 static int alloc_disk_sb(mdk_rdev_t * rdev)
453 {
454 if (rdev->sb_page)
455 MD_BUG();
456
457 rdev->sb_page = alloc_page(GFP_KERNEL);
458 if (!rdev->sb_page) {
459 printk(KERN_ALERT "md: out of memory.\n");
460 return -ENOMEM;
461 }
462
463 return 0;
464 }
465
466 static void free_disk_sb(mdk_rdev_t * rdev)
467 {
468 if (rdev->sb_page) {
469 put_page(rdev->sb_page);
470 rdev->sb_loaded = 0;
471 rdev->sb_page = NULL;
472 rdev->sb_start = 0;
473 rdev->sectors = 0;
474 }
475 }
476
477
478 static void super_written(struct bio *bio, int error)
479 {
480 mdk_rdev_t *rdev = bio->bi_private;
481 mddev_t *mddev = rdev->mddev;
482
483 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
484 printk("md: super_written gets error=%d, uptodate=%d\n",
485 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
486 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
487 md_error(mddev, rdev);
488 }
489
490 if (atomic_dec_and_test(&mddev->pending_writes))
491 wake_up(&mddev->sb_wait);
492 bio_put(bio);
493 }
494
495 static void super_written_barrier(struct bio *bio, int error)
496 {
497 struct bio *bio2 = bio->bi_private;
498 mdk_rdev_t *rdev = bio2->bi_private;
499 mddev_t *mddev = rdev->mddev;
500
501 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
502 error == -EOPNOTSUPP) {
503 unsigned long flags;
504 /* barriers don't appear to be supported :-( */
505 set_bit(BarriersNotsupp, &rdev->flags);
506 mddev->barriers_work = 0;
507 spin_lock_irqsave(&mddev->write_lock, flags);
508 bio2->bi_next = mddev->biolist;
509 mddev->biolist = bio2;
510 spin_unlock_irqrestore(&mddev->write_lock, flags);
511 wake_up(&mddev->sb_wait);
512 bio_put(bio);
513 } else {
514 bio_put(bio2);
515 bio->bi_private = rdev;
516 super_written(bio, error);
517 }
518 }
519
520 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
521 sector_t sector, int size, struct page *page)
522 {
523 /* write first size bytes of page to sector of rdev
524 * Increment mddev->pending_writes before returning
525 * and decrement it on completion, waking up sb_wait
526 * if zero is reached.
527 * If an error occurred, call md_error
528 *
529 * As we might need to resubmit the request if BIO_RW_BARRIER
530 * causes ENOTSUPP, we allocate a spare bio...
531 */
532 struct bio *bio = bio_alloc(GFP_NOIO, 1);
533 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG);
534
535 bio->bi_bdev = rdev->bdev;
536 bio->bi_sector = sector;
537 bio_add_page(bio, page, size, 0);
538 bio->bi_private = rdev;
539 bio->bi_end_io = super_written;
540 bio->bi_rw = rw;
541
542 atomic_inc(&mddev->pending_writes);
543 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
544 struct bio *rbio;
545 rw |= (1<<BIO_RW_BARRIER);
546 rbio = bio_clone(bio, GFP_NOIO);
547 rbio->bi_private = bio;
548 rbio->bi_end_io = super_written_barrier;
549 submit_bio(rw, rbio);
550 } else
551 submit_bio(rw, bio);
552 }
553
554 void md_super_wait(mddev_t *mddev)
555 {
556 /* wait for all superblock writes that were scheduled to complete.
557 * if any had to be retried (due to BARRIER problems), retry them
558 */
559 DEFINE_WAIT(wq);
560 for(;;) {
561 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
562 if (atomic_read(&mddev->pending_writes)==0)
563 break;
564 while (mddev->biolist) {
565 struct bio *bio;
566 spin_lock_irq(&mddev->write_lock);
567 bio = mddev->biolist;
568 mddev->biolist = bio->bi_next ;
569 bio->bi_next = NULL;
570 spin_unlock_irq(&mddev->write_lock);
571 submit_bio(bio->bi_rw, bio);
572 }
573 schedule();
574 }
575 finish_wait(&mddev->sb_wait, &wq);
576 }
577
578 static void bi_complete(struct bio *bio, int error)
579 {
580 complete((struct completion*)bio->bi_private);
581 }
582
583 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
584 struct page *page, int rw)
585 {
586 struct bio *bio = bio_alloc(GFP_NOIO, 1);
587 struct completion event;
588 int ret;
589
590 rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
591
592 bio->bi_bdev = bdev;
593 bio->bi_sector = sector;
594 bio_add_page(bio, page, size, 0);
595 init_completion(&event);
596 bio->bi_private = &event;
597 bio->bi_end_io = bi_complete;
598 submit_bio(rw, bio);
599 wait_for_completion(&event);
600
601 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
602 bio_put(bio);
603 return ret;
604 }
605 EXPORT_SYMBOL_GPL(sync_page_io);
606
607 static int read_disk_sb(mdk_rdev_t * rdev, int size)
608 {
609 char b[BDEVNAME_SIZE];
610 if (!rdev->sb_page) {
611 MD_BUG();
612 return -EINVAL;
613 }
614 if (rdev->sb_loaded)
615 return 0;
616
617
618 if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ))
619 goto fail;
620 rdev->sb_loaded = 1;
621 return 0;
622
623 fail:
624 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
625 bdevname(rdev->bdev,b));
626 return -EINVAL;
627 }
628
629 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
630 {
631 return sb1->set_uuid0 == sb2->set_uuid0 &&
632 sb1->set_uuid1 == sb2->set_uuid1 &&
633 sb1->set_uuid2 == sb2->set_uuid2 &&
634 sb1->set_uuid3 == sb2->set_uuid3;
635 }
636
637 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
638 {
639 int ret;
640 mdp_super_t *tmp1, *tmp2;
641
642 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
643 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
644
645 if (!tmp1 || !tmp2) {
646 ret = 0;
647 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
648 goto abort;
649 }
650
651 *tmp1 = *sb1;
652 *tmp2 = *sb2;
653
654 /*
655 * nr_disks is not constant
656 */
657 tmp1->nr_disks = 0;
658 tmp2->nr_disks = 0;
659
660 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
661 abort:
662 kfree(tmp1);
663 kfree(tmp2);
664 return ret;
665 }
666
667
668 static u32 md_csum_fold(u32 csum)
669 {
670 csum = (csum & 0xffff) + (csum >> 16);
671 return (csum & 0xffff) + (csum >> 16);
672 }
673
674 static unsigned int calc_sb_csum(mdp_super_t * sb)
675 {
676 u64 newcsum = 0;
677 u32 *sb32 = (u32*)sb;
678 int i;
679 unsigned int disk_csum, csum;
680
681 disk_csum = sb->sb_csum;
682 sb->sb_csum = 0;
683
684 for (i = 0; i < MD_SB_BYTES/4 ; i++)
685 newcsum += sb32[i];
686 csum = (newcsum & 0xffffffff) + (newcsum>>32);
687
688
689 #ifdef CONFIG_ALPHA
690 /* This used to use csum_partial, which was wrong for several
691 * reasons including that different results are returned on
692 * different architectures. It isn't critical that we get exactly
693 * the same return value as before (we always csum_fold before
694 * testing, and that removes any differences). However as we
695 * know that csum_partial always returned a 16bit value on
696 * alphas, do a fold to maximise conformity to previous behaviour.
697 */
698 sb->sb_csum = md_csum_fold(disk_csum);
699 #else
700 sb->sb_csum = disk_csum;
701 #endif
702 return csum;
703 }
704
705
706 /*
707 * Handle superblock details.
708 * We want to be able to handle multiple superblock formats
709 * so we have a common interface to them all, and an array of
710 * different handlers.
711 * We rely on user-space to write the initial superblock, and support
712 * reading and updating of superblocks.
713 * Interface methods are:
714 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
715 * loads and validates a superblock on dev.
716 * if refdev != NULL, compare superblocks on both devices
717 * Return:
718 * 0 - dev has a superblock that is compatible with refdev
719 * 1 - dev has a superblock that is compatible and newer than refdev
720 * so dev should be used as the refdev in future
721 * -EINVAL superblock incompatible or invalid
722 * -othererror e.g. -EIO
723 *
724 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
725 * Verify that dev is acceptable into mddev.
726 * The first time, mddev->raid_disks will be 0, and data from
727 * dev should be merged in. Subsequent calls check that dev
728 * is new enough. Return 0 or -EINVAL
729 *
730 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
731 * Update the superblock for rdev with data in mddev
732 * This does not write to disc.
733 *
734 */
735
736 struct super_type {
737 char *name;
738 struct module *owner;
739 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
740 int minor_version);
741 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
742 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
743 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
744 sector_t num_sectors);
745 };
746
747 /*
748 * load_super for 0.90.0
749 */
750 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
751 {
752 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
753 mdp_super_t *sb;
754 int ret;
755
756 /*
757 * Calculate the position of the superblock (512byte sectors),
758 * it's at the end of the disk.
759 *
760 * It also happens to be a multiple of 4Kb.
761 */
762 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
763
764 ret = read_disk_sb(rdev, MD_SB_BYTES);
765 if (ret) return ret;
766
767 ret = -EINVAL;
768
769 bdevname(rdev->bdev, b);
770 sb = (mdp_super_t*)page_address(rdev->sb_page);
771
772 if (sb->md_magic != MD_SB_MAGIC) {
773 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
774 b);
775 goto abort;
776 }
777
778 if (sb->major_version != 0 ||
779 sb->minor_version < 90 ||
780 sb->minor_version > 91) {
781 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
782 sb->major_version, sb->minor_version,
783 b);
784 goto abort;
785 }
786
787 if (sb->raid_disks <= 0)
788 goto abort;
789
790 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
791 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
792 b);
793 goto abort;
794 }
795
796 rdev->preferred_minor = sb->md_minor;
797 rdev->data_offset = 0;
798 rdev->sb_size = MD_SB_BYTES;
799
800 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
801 if (sb->level != 1 && sb->level != 4
802 && sb->level != 5 && sb->level != 6
803 && sb->level != 10) {
804 /* FIXME use a better test */
805 printk(KERN_WARNING
806 "md: bitmaps not supported for this level.\n");
807 goto abort;
808 }
809 }
810
811 if (sb->level == LEVEL_MULTIPATH)
812 rdev->desc_nr = -1;
813 else
814 rdev->desc_nr = sb->this_disk.number;
815
816 if (!refdev) {
817 ret = 1;
818 } else {
819 __u64 ev1, ev2;
820 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
821 if (!uuid_equal(refsb, sb)) {
822 printk(KERN_WARNING "md: %s has different UUID to %s\n",
823 b, bdevname(refdev->bdev,b2));
824 goto abort;
825 }
826 if (!sb_equal(refsb, sb)) {
827 printk(KERN_WARNING "md: %s has same UUID"
828 " but different superblock to %s\n",
829 b, bdevname(refdev->bdev, b2));
830 goto abort;
831 }
832 ev1 = md_event(sb);
833 ev2 = md_event(refsb);
834 if (ev1 > ev2)
835 ret = 1;
836 else
837 ret = 0;
838 }
839 rdev->sectors = calc_num_sectors(rdev, sb->chunk_size);
840
841 if (rdev->sectors < sb->size * 2 && sb->level > 1)
842 /* "this cannot possibly happen" ... */
843 ret = -EINVAL;
844
845 abort:
846 return ret;
847 }
848
849 /*
850 * validate_super for 0.90.0
851 */
852 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
853 {
854 mdp_disk_t *desc;
855 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
856 __u64 ev1 = md_event(sb);
857
858 rdev->raid_disk = -1;
859 clear_bit(Faulty, &rdev->flags);
860 clear_bit(In_sync, &rdev->flags);
861 clear_bit(WriteMostly, &rdev->flags);
862 clear_bit(BarriersNotsupp, &rdev->flags);
863
864 if (mddev->raid_disks == 0) {
865 mddev->major_version = 0;
866 mddev->minor_version = sb->minor_version;
867 mddev->patch_version = sb->patch_version;
868 mddev->external = 0;
869 mddev->chunk_size = sb->chunk_size;
870 mddev->ctime = sb->ctime;
871 mddev->utime = sb->utime;
872 mddev->level = sb->level;
873 mddev->clevel[0] = 0;
874 mddev->layout = sb->layout;
875 mddev->raid_disks = sb->raid_disks;
876 mddev->dev_sectors = sb->size * 2;
877 mddev->events = ev1;
878 mddev->bitmap_offset = 0;
879 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
880
881 if (mddev->minor_version >= 91) {
882 mddev->reshape_position = sb->reshape_position;
883 mddev->delta_disks = sb->delta_disks;
884 mddev->new_level = sb->new_level;
885 mddev->new_layout = sb->new_layout;
886 mddev->new_chunk = sb->new_chunk;
887 } else {
888 mddev->reshape_position = MaxSector;
889 mddev->delta_disks = 0;
890 mddev->new_level = mddev->level;
891 mddev->new_layout = mddev->layout;
892 mddev->new_chunk = mddev->chunk_size;
893 }
894
895 if (sb->state & (1<<MD_SB_CLEAN))
896 mddev->recovery_cp = MaxSector;
897 else {
898 if (sb->events_hi == sb->cp_events_hi &&
899 sb->events_lo == sb->cp_events_lo) {
900 mddev->recovery_cp = sb->recovery_cp;
901 } else
902 mddev->recovery_cp = 0;
903 }
904
905 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
906 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
907 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
908 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
909
910 mddev->max_disks = MD_SB_DISKS;
911
912 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
913 mddev->bitmap_file == NULL)
914 mddev->bitmap_offset = mddev->default_bitmap_offset;
915
916 } else if (mddev->pers == NULL) {
917 /* Insist on good event counter while assembling */
918 ++ev1;
919 if (ev1 < mddev->events)
920 return -EINVAL;
921 } else if (mddev->bitmap) {
922 /* if adding to array with a bitmap, then we can accept an
923 * older device ... but not too old.
924 */
925 if (ev1 < mddev->bitmap->events_cleared)
926 return 0;
927 } else {
928 if (ev1 < mddev->events)
929 /* just a hot-add of a new device, leave raid_disk at -1 */
930 return 0;
931 }
932
933 if (mddev->level != LEVEL_MULTIPATH) {
934 desc = sb->disks + rdev->desc_nr;
935
936 if (desc->state & (1<<MD_DISK_FAULTY))
937 set_bit(Faulty, &rdev->flags);
938 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
939 desc->raid_disk < mddev->raid_disks */) {
940 set_bit(In_sync, &rdev->flags);
941 rdev->raid_disk = desc->raid_disk;
942 }
943 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
944 set_bit(WriteMostly, &rdev->flags);
945 } else /* MULTIPATH are always insync */
946 set_bit(In_sync, &rdev->flags);
947 return 0;
948 }
949
950 /*
951 * sync_super for 0.90.0
952 */
953 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
954 {
955 mdp_super_t *sb;
956 mdk_rdev_t *rdev2;
957 int next_spare = mddev->raid_disks;
958
959
960 /* make rdev->sb match mddev data..
961 *
962 * 1/ zero out disks
963 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
964 * 3/ any empty disks < next_spare become removed
965 *
966 * disks[0] gets initialised to REMOVED because
967 * we cannot be sure from other fields if it has
968 * been initialised or not.
969 */
970 int i;
971 int active=0, working=0,failed=0,spare=0,nr_disks=0;
972
973 rdev->sb_size = MD_SB_BYTES;
974
975 sb = (mdp_super_t*)page_address(rdev->sb_page);
976
977 memset(sb, 0, sizeof(*sb));
978
979 sb->md_magic = MD_SB_MAGIC;
980 sb->major_version = mddev->major_version;
981 sb->patch_version = mddev->patch_version;
982 sb->gvalid_words = 0; /* ignored */
983 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
984 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
985 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
986 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
987
988 sb->ctime = mddev->ctime;
989 sb->level = mddev->level;
990 sb->size = mddev->dev_sectors / 2;
991 sb->raid_disks = mddev->raid_disks;
992 sb->md_minor = mddev->md_minor;
993 sb->not_persistent = 0;
994 sb->utime = mddev->utime;
995 sb->state = 0;
996 sb->events_hi = (mddev->events>>32);
997 sb->events_lo = (u32)mddev->events;
998
999 if (mddev->reshape_position == MaxSector)
1000 sb->minor_version = 90;
1001 else {
1002 sb->minor_version = 91;
1003 sb->reshape_position = mddev->reshape_position;
1004 sb->new_level = mddev->new_level;
1005 sb->delta_disks = mddev->delta_disks;
1006 sb->new_layout = mddev->new_layout;
1007 sb->new_chunk = mddev->new_chunk;
1008 }
1009 mddev->minor_version = sb->minor_version;
1010 if (mddev->in_sync)
1011 {
1012 sb->recovery_cp = mddev->recovery_cp;
1013 sb->cp_events_hi = (mddev->events>>32);
1014 sb->cp_events_lo = (u32)mddev->events;
1015 if (mddev->recovery_cp == MaxSector)
1016 sb->state = (1<< MD_SB_CLEAN);
1017 } else
1018 sb->recovery_cp = 0;
1019
1020 sb->layout = mddev->layout;
1021 sb->chunk_size = mddev->chunk_size;
1022
1023 if (mddev->bitmap && mddev->bitmap_file == NULL)
1024 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1025
1026 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1027 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1028 mdp_disk_t *d;
1029 int desc_nr;
1030 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
1031 && !test_bit(Faulty, &rdev2->flags))
1032 desc_nr = rdev2->raid_disk;
1033 else
1034 desc_nr = next_spare++;
1035 rdev2->desc_nr = desc_nr;
1036 d = &sb->disks[rdev2->desc_nr];
1037 nr_disks++;
1038 d->number = rdev2->desc_nr;
1039 d->major = MAJOR(rdev2->bdev->bd_dev);
1040 d->minor = MINOR(rdev2->bdev->bd_dev);
1041 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
1042 && !test_bit(Faulty, &rdev2->flags))
1043 d->raid_disk = rdev2->raid_disk;
1044 else
1045 d->raid_disk = rdev2->desc_nr; /* compatibility */
1046 if (test_bit(Faulty, &rdev2->flags))
1047 d->state = (1<<MD_DISK_FAULTY);
1048 else if (test_bit(In_sync, &rdev2->flags)) {
1049 d->state = (1<<MD_DISK_ACTIVE);
1050 d->state |= (1<<MD_DISK_SYNC);
1051 active++;
1052 working++;
1053 } else {
1054 d->state = 0;
1055 spare++;
1056 working++;
1057 }
1058 if (test_bit(WriteMostly, &rdev2->flags))
1059 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1060 }
1061 /* now set the "removed" and "faulty" bits on any missing devices */
1062 for (i=0 ; i < mddev->raid_disks ; i++) {
1063 mdp_disk_t *d = &sb->disks[i];
1064 if (d->state == 0 && d->number == 0) {
1065 d->number = i;
1066 d->raid_disk = i;
1067 d->state = (1<<MD_DISK_REMOVED);
1068 d->state |= (1<<MD_DISK_FAULTY);
1069 failed++;
1070 }
1071 }
1072 sb->nr_disks = nr_disks;
1073 sb->active_disks = active;
1074 sb->working_disks = working;
1075 sb->failed_disks = failed;
1076 sb->spare_disks = spare;
1077
1078 sb->this_disk = sb->disks[rdev->desc_nr];
1079 sb->sb_csum = calc_sb_csum(sb);
1080 }
1081
1082 /*
1083 * rdev_size_change for 0.90.0
1084 */
1085 static unsigned long long
1086 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1087 {
1088 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1089 return 0; /* component must fit device */
1090 if (rdev->mddev->bitmap_offset)
1091 return 0; /* can't move bitmap */
1092 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
1093 if (!num_sectors || num_sectors > rdev->sb_start)
1094 num_sectors = rdev->sb_start;
1095 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1096 rdev->sb_page);
1097 md_super_wait(rdev->mddev);
1098 return num_sectors / 2; /* kB for sysfs */
1099 }
1100
1101
1102 /*
1103 * version 1 superblock
1104 */
1105
1106 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1107 {
1108 __le32 disk_csum;
1109 u32 csum;
1110 unsigned long long newcsum;
1111 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1112 __le32 *isuper = (__le32*)sb;
1113 int i;
1114
1115 disk_csum = sb->sb_csum;
1116 sb->sb_csum = 0;
1117 newcsum = 0;
1118 for (i=0; size>=4; size -= 4 )
1119 newcsum += le32_to_cpu(*isuper++);
1120
1121 if (size == 2)
1122 newcsum += le16_to_cpu(*(__le16*) isuper);
1123
1124 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1125 sb->sb_csum = disk_csum;
1126 return cpu_to_le32(csum);
1127 }
1128
1129 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1130 {
1131 struct mdp_superblock_1 *sb;
1132 int ret;
1133 sector_t sb_start;
1134 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1135 int bmask;
1136
1137 /*
1138 * Calculate the position of the superblock in 512byte sectors.
1139 * It is always aligned to a 4K boundary and
1140 * depeding on minor_version, it can be:
1141 * 0: At least 8K, but less than 12K, from end of device
1142 * 1: At start of device
1143 * 2: 4K from start of device.
1144 */
1145 switch(minor_version) {
1146 case 0:
1147 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1148 sb_start -= 8*2;
1149 sb_start &= ~(sector_t)(4*2-1);
1150 break;
1151 case 1:
1152 sb_start = 0;
1153 break;
1154 case 2:
1155 sb_start = 8;
1156 break;
1157 default:
1158 return -EINVAL;
1159 }
1160 rdev->sb_start = sb_start;
1161
1162 /* superblock is rarely larger than 1K, but it can be larger,
1163 * and it is safe to read 4k, so we do that
1164 */
1165 ret = read_disk_sb(rdev, 4096);
1166 if (ret) return ret;
1167
1168
1169 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1170
1171 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1172 sb->major_version != cpu_to_le32(1) ||
1173 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1174 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1175 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1176 return -EINVAL;
1177
1178 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1179 printk("md: invalid superblock checksum on %s\n",
1180 bdevname(rdev->bdev,b));
1181 return -EINVAL;
1182 }
1183 if (le64_to_cpu(sb->data_size) < 10) {
1184 printk("md: data_size too small on %s\n",
1185 bdevname(rdev->bdev,b));
1186 return -EINVAL;
1187 }
1188 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1189 if (sb->level != cpu_to_le32(1) &&
1190 sb->level != cpu_to_le32(4) &&
1191 sb->level != cpu_to_le32(5) &&
1192 sb->level != cpu_to_le32(6) &&
1193 sb->level != cpu_to_le32(10)) {
1194 printk(KERN_WARNING
1195 "md: bitmaps not supported for this level.\n");
1196 return -EINVAL;
1197 }
1198 }
1199
1200 rdev->preferred_minor = 0xffff;
1201 rdev->data_offset = le64_to_cpu(sb->data_offset);
1202 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1203
1204 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1205 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1206 if (rdev->sb_size & bmask)
1207 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1208
1209 if (minor_version
1210 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1211 return -EINVAL;
1212
1213 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1214 rdev->desc_nr = -1;
1215 else
1216 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1217
1218 if (!refdev) {
1219 ret = 1;
1220 } else {
1221 __u64 ev1, ev2;
1222 struct mdp_superblock_1 *refsb =
1223 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1224
1225 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1226 sb->level != refsb->level ||
1227 sb->layout != refsb->layout ||
1228 sb->chunksize != refsb->chunksize) {
1229 printk(KERN_WARNING "md: %s has strangely different"
1230 " superblock to %s\n",
1231 bdevname(rdev->bdev,b),
1232 bdevname(refdev->bdev,b2));
1233 return -EINVAL;
1234 }
1235 ev1 = le64_to_cpu(sb->events);
1236 ev2 = le64_to_cpu(refsb->events);
1237
1238 if (ev1 > ev2)
1239 ret = 1;
1240 else
1241 ret = 0;
1242 }
1243 if (minor_version)
1244 rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) -
1245 le64_to_cpu(sb->data_offset);
1246 else
1247 rdev->sectors = rdev->sb_start;
1248 if (rdev->sectors < le64_to_cpu(sb->data_size))
1249 return -EINVAL;
1250 rdev->sectors = le64_to_cpu(sb->data_size);
1251 if (le32_to_cpu(sb->chunksize))
1252 rdev->sectors &= ~((sector_t)le32_to_cpu(sb->chunksize) - 1);
1253
1254 if (le64_to_cpu(sb->size) > rdev->sectors)
1255 return -EINVAL;
1256 return ret;
1257 }
1258
1259 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1260 {
1261 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1262 __u64 ev1 = le64_to_cpu(sb->events);
1263
1264 rdev->raid_disk = -1;
1265 clear_bit(Faulty, &rdev->flags);
1266 clear_bit(In_sync, &rdev->flags);
1267 clear_bit(WriteMostly, &rdev->flags);
1268 clear_bit(BarriersNotsupp, &rdev->flags);
1269
1270 if (mddev->raid_disks == 0) {
1271 mddev->major_version = 1;
1272 mddev->patch_version = 0;
1273 mddev->external = 0;
1274 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1275 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1276 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1277 mddev->level = le32_to_cpu(sb->level);
1278 mddev->clevel[0] = 0;
1279 mddev->layout = le32_to_cpu(sb->layout);
1280 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1281 mddev->dev_sectors = le64_to_cpu(sb->size);
1282 mddev->events = ev1;
1283 mddev->bitmap_offset = 0;
1284 mddev->default_bitmap_offset = 1024 >> 9;
1285
1286 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1287 memcpy(mddev->uuid, sb->set_uuid, 16);
1288
1289 mddev->max_disks = (4096-256)/2;
1290
1291 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1292 mddev->bitmap_file == NULL )
1293 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1294
1295 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1296 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1297 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1298 mddev->new_level = le32_to_cpu(sb->new_level);
1299 mddev->new_layout = le32_to_cpu(sb->new_layout);
1300 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1301 } else {
1302 mddev->reshape_position = MaxSector;
1303 mddev->delta_disks = 0;
1304 mddev->new_level = mddev->level;
1305 mddev->new_layout = mddev->layout;
1306 mddev->new_chunk = mddev->chunk_size;
1307 }
1308
1309 } else if (mddev->pers == NULL) {
1310 /* Insist of good event counter while assembling */
1311 ++ev1;
1312 if (ev1 < mddev->events)
1313 return -EINVAL;
1314 } else if (mddev->bitmap) {
1315 /* If adding to array with a bitmap, then we can accept an
1316 * older device, but not too old.
1317 */
1318 if (ev1 < mddev->bitmap->events_cleared)
1319 return 0;
1320 } else {
1321 if (ev1 < mddev->events)
1322 /* just a hot-add of a new device, leave raid_disk at -1 */
1323 return 0;
1324 }
1325 if (mddev->level != LEVEL_MULTIPATH) {
1326 int role;
1327 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1328 switch(role) {
1329 case 0xffff: /* spare */
1330 break;
1331 case 0xfffe: /* faulty */
1332 set_bit(Faulty, &rdev->flags);
1333 break;
1334 default:
1335 if ((le32_to_cpu(sb->feature_map) &
1336 MD_FEATURE_RECOVERY_OFFSET))
1337 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1338 else
1339 set_bit(In_sync, &rdev->flags);
1340 rdev->raid_disk = role;
1341 break;
1342 }
1343 if (sb->devflags & WriteMostly1)
1344 set_bit(WriteMostly, &rdev->flags);
1345 } else /* MULTIPATH are always insync */
1346 set_bit(In_sync, &rdev->flags);
1347
1348 return 0;
1349 }
1350
1351 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1352 {
1353 struct mdp_superblock_1 *sb;
1354 mdk_rdev_t *rdev2;
1355 int max_dev, i;
1356 /* make rdev->sb match mddev and rdev data. */
1357
1358 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1359
1360 sb->feature_map = 0;
1361 sb->pad0 = 0;
1362 sb->recovery_offset = cpu_to_le64(0);
1363 memset(sb->pad1, 0, sizeof(sb->pad1));
1364 memset(sb->pad2, 0, sizeof(sb->pad2));
1365 memset(sb->pad3, 0, sizeof(sb->pad3));
1366
1367 sb->utime = cpu_to_le64((__u64)mddev->utime);
1368 sb->events = cpu_to_le64(mddev->events);
1369 if (mddev->in_sync)
1370 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1371 else
1372 sb->resync_offset = cpu_to_le64(0);
1373
1374 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1375
1376 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1377 sb->size = cpu_to_le64(mddev->dev_sectors);
1378
1379 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1380 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1381 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1382 }
1383
1384 if (rdev->raid_disk >= 0 &&
1385 !test_bit(In_sync, &rdev->flags)) {
1386 if (mddev->curr_resync_completed > rdev->recovery_offset)
1387 rdev->recovery_offset = mddev->curr_resync_completed;
1388 if (rdev->recovery_offset > 0) {
1389 sb->feature_map |=
1390 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1391 sb->recovery_offset =
1392 cpu_to_le64(rdev->recovery_offset);
1393 }
1394 }
1395
1396 if (mddev->reshape_position != MaxSector) {
1397 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1398 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1399 sb->new_layout = cpu_to_le32(mddev->new_layout);
1400 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1401 sb->new_level = cpu_to_le32(mddev->new_level);
1402 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1403 }
1404
1405 max_dev = 0;
1406 list_for_each_entry(rdev2, &mddev->disks, same_set)
1407 if (rdev2->desc_nr+1 > max_dev)
1408 max_dev = rdev2->desc_nr+1;
1409
1410 if (max_dev > le32_to_cpu(sb->max_dev))
1411 sb->max_dev = cpu_to_le32(max_dev);
1412 for (i=0; i<max_dev;i++)
1413 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1414
1415 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1416 i = rdev2->desc_nr;
1417 if (test_bit(Faulty, &rdev2->flags))
1418 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1419 else if (test_bit(In_sync, &rdev2->flags))
1420 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1421 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1422 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1423 else
1424 sb->dev_roles[i] = cpu_to_le16(0xffff);
1425 }
1426
1427 sb->sb_csum = calc_sb_1_csum(sb);
1428 }
1429
1430 static unsigned long long
1431 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1432 {
1433 struct mdp_superblock_1 *sb;
1434 sector_t max_sectors;
1435 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1436 return 0; /* component must fit device */
1437 if (rdev->sb_start < rdev->data_offset) {
1438 /* minor versions 1 and 2; superblock before data */
1439 max_sectors = rdev->bdev->bd_inode->i_size >> 9;
1440 max_sectors -= rdev->data_offset;
1441 if (!num_sectors || num_sectors > max_sectors)
1442 num_sectors = max_sectors;
1443 } else if (rdev->mddev->bitmap_offset) {
1444 /* minor version 0 with bitmap we can't move */
1445 return 0;
1446 } else {
1447 /* minor version 0; superblock after data */
1448 sector_t sb_start;
1449 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1450 sb_start &= ~(sector_t)(4*2 - 1);
1451 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1452 if (!num_sectors || num_sectors > max_sectors)
1453 num_sectors = max_sectors;
1454 rdev->sb_start = sb_start;
1455 }
1456 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1457 sb->data_size = cpu_to_le64(num_sectors);
1458 sb->super_offset = rdev->sb_start;
1459 sb->sb_csum = calc_sb_1_csum(sb);
1460 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1461 rdev->sb_page);
1462 md_super_wait(rdev->mddev);
1463 return num_sectors / 2; /* kB for sysfs */
1464 }
1465
1466 static struct super_type super_types[] = {
1467 [0] = {
1468 .name = "0.90.0",
1469 .owner = THIS_MODULE,
1470 .load_super = super_90_load,
1471 .validate_super = super_90_validate,
1472 .sync_super = super_90_sync,
1473 .rdev_size_change = super_90_rdev_size_change,
1474 },
1475 [1] = {
1476 .name = "md-1",
1477 .owner = THIS_MODULE,
1478 .load_super = super_1_load,
1479 .validate_super = super_1_validate,
1480 .sync_super = super_1_sync,
1481 .rdev_size_change = super_1_rdev_size_change,
1482 },
1483 };
1484
1485 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1486 {
1487 mdk_rdev_t *rdev, *rdev2;
1488
1489 rcu_read_lock();
1490 rdev_for_each_rcu(rdev, mddev1)
1491 rdev_for_each_rcu(rdev2, mddev2)
1492 if (rdev->bdev->bd_contains ==
1493 rdev2->bdev->bd_contains) {
1494 rcu_read_unlock();
1495 return 1;
1496 }
1497 rcu_read_unlock();
1498 return 0;
1499 }
1500
1501 static LIST_HEAD(pending_raid_disks);
1502
1503 static void md_integrity_check(mdk_rdev_t *rdev, mddev_t *mddev)
1504 {
1505 struct mdk_personality *pers = mddev->pers;
1506 struct gendisk *disk = mddev->gendisk;
1507 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1508 struct blk_integrity *bi_mddev = blk_get_integrity(disk);
1509
1510 /* Data integrity passthrough not supported on RAID 4, 5 and 6 */
1511 if (pers && pers->level >= 4 && pers->level <= 6)
1512 return;
1513
1514 /* If rdev is integrity capable, register profile for mddev */
1515 if (!bi_mddev && bi_rdev) {
1516 if (blk_integrity_register(disk, bi_rdev))
1517 printk(KERN_ERR "%s: %s Could not register integrity!\n",
1518 __func__, disk->disk_name);
1519 else
1520 printk(KERN_NOTICE "Enabling data integrity on %s\n",
1521 disk->disk_name);
1522 return;
1523 }
1524
1525 /* Check that mddev and rdev have matching profiles */
1526 if (blk_integrity_compare(disk, rdev->bdev->bd_disk) < 0) {
1527 printk(KERN_ERR "%s: %s/%s integrity mismatch!\n", __func__,
1528 disk->disk_name, rdev->bdev->bd_disk->disk_name);
1529 printk(KERN_NOTICE "Disabling data integrity on %s\n",
1530 disk->disk_name);
1531 blk_integrity_unregister(disk);
1532 }
1533 }
1534
1535 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1536 {
1537 char b[BDEVNAME_SIZE];
1538 struct kobject *ko;
1539 char *s;
1540 int err;
1541
1542 if (rdev->mddev) {
1543 MD_BUG();
1544 return -EINVAL;
1545 }
1546
1547 /* prevent duplicates */
1548 if (find_rdev(mddev, rdev->bdev->bd_dev))
1549 return -EEXIST;
1550
1551 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1552 if (rdev->sectors && (mddev->dev_sectors == 0 ||
1553 rdev->sectors < mddev->dev_sectors)) {
1554 if (mddev->pers) {
1555 /* Cannot change size, so fail
1556 * If mddev->level <= 0, then we don't care
1557 * about aligning sizes (e.g. linear)
1558 */
1559 if (mddev->level > 0)
1560 return -ENOSPC;
1561 } else
1562 mddev->dev_sectors = rdev->sectors;
1563 }
1564
1565 /* Verify rdev->desc_nr is unique.
1566 * If it is -1, assign a free number, else
1567 * check number is not in use
1568 */
1569 if (rdev->desc_nr < 0) {
1570 int choice = 0;
1571 if (mddev->pers) choice = mddev->raid_disks;
1572 while (find_rdev_nr(mddev, choice))
1573 choice++;
1574 rdev->desc_nr = choice;
1575 } else {
1576 if (find_rdev_nr(mddev, rdev->desc_nr))
1577 return -EBUSY;
1578 }
1579 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1580 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1581 mdname(mddev), mddev->max_disks);
1582 return -EBUSY;
1583 }
1584 bdevname(rdev->bdev,b);
1585 while ( (s=strchr(b, '/')) != NULL)
1586 *s = '!';
1587
1588 rdev->mddev = mddev;
1589 printk(KERN_INFO "md: bind<%s>\n", b);
1590
1591 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1592 goto fail;
1593
1594 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1595 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1596 kobject_del(&rdev->kobj);
1597 goto fail;
1598 }
1599 rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state");
1600
1601 list_add_rcu(&rdev->same_set, &mddev->disks);
1602 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1603
1604 /* May as well allow recovery to be retried once */
1605 mddev->recovery_disabled = 0;
1606
1607 md_integrity_check(rdev, mddev);
1608 return 0;
1609
1610 fail:
1611 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1612 b, mdname(mddev));
1613 return err;
1614 }
1615
1616 static void md_delayed_delete(struct work_struct *ws)
1617 {
1618 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1619 kobject_del(&rdev->kobj);
1620 kobject_put(&rdev->kobj);
1621 }
1622
1623 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1624 {
1625 char b[BDEVNAME_SIZE];
1626 if (!rdev->mddev) {
1627 MD_BUG();
1628 return;
1629 }
1630 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1631 list_del_rcu(&rdev->same_set);
1632 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1633 rdev->mddev = NULL;
1634 sysfs_remove_link(&rdev->kobj, "block");
1635 sysfs_put(rdev->sysfs_state);
1636 rdev->sysfs_state = NULL;
1637 /* We need to delay this, otherwise we can deadlock when
1638 * writing to 'remove' to "dev/state". We also need
1639 * to delay it due to rcu usage.
1640 */
1641 synchronize_rcu();
1642 INIT_WORK(&rdev->del_work, md_delayed_delete);
1643 kobject_get(&rdev->kobj);
1644 schedule_work(&rdev->del_work);
1645 }
1646
1647 /*
1648 * prevent the device from being mounted, repartitioned or
1649 * otherwise reused by a RAID array (or any other kernel
1650 * subsystem), by bd_claiming the device.
1651 */
1652 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1653 {
1654 int err = 0;
1655 struct block_device *bdev;
1656 char b[BDEVNAME_SIZE];
1657
1658 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1659 if (IS_ERR(bdev)) {
1660 printk(KERN_ERR "md: could not open %s.\n",
1661 __bdevname(dev, b));
1662 return PTR_ERR(bdev);
1663 }
1664 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1665 if (err) {
1666 printk(KERN_ERR "md: could not bd_claim %s.\n",
1667 bdevname(bdev, b));
1668 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1669 return err;
1670 }
1671 if (!shared)
1672 set_bit(AllReserved, &rdev->flags);
1673 rdev->bdev = bdev;
1674 return err;
1675 }
1676
1677 static void unlock_rdev(mdk_rdev_t *rdev)
1678 {
1679 struct block_device *bdev = rdev->bdev;
1680 rdev->bdev = NULL;
1681 if (!bdev)
1682 MD_BUG();
1683 bd_release(bdev);
1684 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1685 }
1686
1687 void md_autodetect_dev(dev_t dev);
1688
1689 static void export_rdev(mdk_rdev_t * rdev)
1690 {
1691 char b[BDEVNAME_SIZE];
1692 printk(KERN_INFO "md: export_rdev(%s)\n",
1693 bdevname(rdev->bdev,b));
1694 if (rdev->mddev)
1695 MD_BUG();
1696 free_disk_sb(rdev);
1697 #ifndef MODULE
1698 if (test_bit(AutoDetected, &rdev->flags))
1699 md_autodetect_dev(rdev->bdev->bd_dev);
1700 #endif
1701 unlock_rdev(rdev);
1702 kobject_put(&rdev->kobj);
1703 }
1704
1705 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1706 {
1707 unbind_rdev_from_array(rdev);
1708 export_rdev(rdev);
1709 }
1710
1711 static void export_array(mddev_t *mddev)
1712 {
1713 mdk_rdev_t *rdev, *tmp;
1714
1715 rdev_for_each(rdev, tmp, mddev) {
1716 if (!rdev->mddev) {
1717 MD_BUG();
1718 continue;
1719 }
1720 kick_rdev_from_array(rdev);
1721 }
1722 if (!list_empty(&mddev->disks))
1723 MD_BUG();
1724 mddev->raid_disks = 0;
1725 mddev->major_version = 0;
1726 }
1727
1728 static void print_desc(mdp_disk_t *desc)
1729 {
1730 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1731 desc->major,desc->minor,desc->raid_disk,desc->state);
1732 }
1733
1734 static void print_sb_90(mdp_super_t *sb)
1735 {
1736 int i;
1737
1738 printk(KERN_INFO
1739 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1740 sb->major_version, sb->minor_version, sb->patch_version,
1741 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1742 sb->ctime);
1743 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1744 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1745 sb->md_minor, sb->layout, sb->chunk_size);
1746 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1747 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1748 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1749 sb->failed_disks, sb->spare_disks,
1750 sb->sb_csum, (unsigned long)sb->events_lo);
1751
1752 printk(KERN_INFO);
1753 for (i = 0; i < MD_SB_DISKS; i++) {
1754 mdp_disk_t *desc;
1755
1756 desc = sb->disks + i;
1757 if (desc->number || desc->major || desc->minor ||
1758 desc->raid_disk || (desc->state && (desc->state != 4))) {
1759 printk(" D %2d: ", i);
1760 print_desc(desc);
1761 }
1762 }
1763 printk(KERN_INFO "md: THIS: ");
1764 print_desc(&sb->this_disk);
1765 }
1766
1767 static void print_sb_1(struct mdp_superblock_1 *sb)
1768 {
1769 __u8 *uuid;
1770
1771 uuid = sb->set_uuid;
1772 printk(KERN_INFO "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x"
1773 ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n"
1774 KERN_INFO "md: Name: \"%s\" CT:%llu\n",
1775 le32_to_cpu(sb->major_version),
1776 le32_to_cpu(sb->feature_map),
1777 uuid[0], uuid[1], uuid[2], uuid[3],
1778 uuid[4], uuid[5], uuid[6], uuid[7],
1779 uuid[8], uuid[9], uuid[10], uuid[11],
1780 uuid[12], uuid[13], uuid[14], uuid[15],
1781 sb->set_name,
1782 (unsigned long long)le64_to_cpu(sb->ctime)
1783 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
1784
1785 uuid = sb->device_uuid;
1786 printk(KERN_INFO "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1787 " RO:%llu\n"
1788 KERN_INFO "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x"
1789 ":%02x%02x%02x%02x%02x%02x\n"
1790 KERN_INFO "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1791 KERN_INFO "md: (MaxDev:%u) \n",
1792 le32_to_cpu(sb->level),
1793 (unsigned long long)le64_to_cpu(sb->size),
1794 le32_to_cpu(sb->raid_disks),
1795 le32_to_cpu(sb->layout),
1796 le32_to_cpu(sb->chunksize),
1797 (unsigned long long)le64_to_cpu(sb->data_offset),
1798 (unsigned long long)le64_to_cpu(sb->data_size),
1799 (unsigned long long)le64_to_cpu(sb->super_offset),
1800 (unsigned long long)le64_to_cpu(sb->recovery_offset),
1801 le32_to_cpu(sb->dev_number),
1802 uuid[0], uuid[1], uuid[2], uuid[3],
1803 uuid[4], uuid[5], uuid[6], uuid[7],
1804 uuid[8], uuid[9], uuid[10], uuid[11],
1805 uuid[12], uuid[13], uuid[14], uuid[15],
1806 sb->devflags,
1807 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
1808 (unsigned long long)le64_to_cpu(sb->events),
1809 (unsigned long long)le64_to_cpu(sb->resync_offset),
1810 le32_to_cpu(sb->sb_csum),
1811 le32_to_cpu(sb->max_dev)
1812 );
1813 }
1814
1815 static void print_rdev(mdk_rdev_t *rdev, int major_version)
1816 {
1817 char b[BDEVNAME_SIZE];
1818 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
1819 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
1820 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1821 rdev->desc_nr);
1822 if (rdev->sb_loaded) {
1823 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
1824 switch (major_version) {
1825 case 0:
1826 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
1827 break;
1828 case 1:
1829 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
1830 break;
1831 }
1832 } else
1833 printk(KERN_INFO "md: no rdev superblock!\n");
1834 }
1835
1836 static void md_print_devices(void)
1837 {
1838 struct list_head *tmp;
1839 mdk_rdev_t *rdev;
1840 mddev_t *mddev;
1841 char b[BDEVNAME_SIZE];
1842
1843 printk("\n");
1844 printk("md: **********************************\n");
1845 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1846 printk("md: **********************************\n");
1847 for_each_mddev(mddev, tmp) {
1848
1849 if (mddev->bitmap)
1850 bitmap_print_sb(mddev->bitmap);
1851 else
1852 printk("%s: ", mdname(mddev));
1853 list_for_each_entry(rdev, &mddev->disks, same_set)
1854 printk("<%s>", bdevname(rdev->bdev,b));
1855 printk("\n");
1856
1857 list_for_each_entry(rdev, &mddev->disks, same_set)
1858 print_rdev(rdev, mddev->major_version);
1859 }
1860 printk("md: **********************************\n");
1861 printk("\n");
1862 }
1863
1864
1865 static void sync_sbs(mddev_t * mddev, int nospares)
1866 {
1867 /* Update each superblock (in-memory image), but
1868 * if we are allowed to, skip spares which already
1869 * have the right event counter, or have one earlier
1870 * (which would mean they aren't being marked as dirty
1871 * with the rest of the array)
1872 */
1873 mdk_rdev_t *rdev;
1874
1875 list_for_each_entry(rdev, &mddev->disks, same_set) {
1876 if (rdev->sb_events == mddev->events ||
1877 (nospares &&
1878 rdev->raid_disk < 0 &&
1879 (rdev->sb_events&1)==0 &&
1880 rdev->sb_events+1 == mddev->events)) {
1881 /* Don't update this superblock */
1882 rdev->sb_loaded = 2;
1883 } else {
1884 super_types[mddev->major_version].
1885 sync_super(mddev, rdev);
1886 rdev->sb_loaded = 1;
1887 }
1888 }
1889 }
1890
1891 static void md_update_sb(mddev_t * mddev, int force_change)
1892 {
1893 mdk_rdev_t *rdev;
1894 int sync_req;
1895 int nospares = 0;
1896
1897 if (mddev->external)
1898 return;
1899 repeat:
1900 spin_lock_irq(&mddev->write_lock);
1901
1902 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1903 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1904 force_change = 1;
1905 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1906 /* just a clean<-> dirty transition, possibly leave spares alone,
1907 * though if events isn't the right even/odd, we will have to do
1908 * spares after all
1909 */
1910 nospares = 1;
1911 if (force_change)
1912 nospares = 0;
1913 if (mddev->degraded)
1914 /* If the array is degraded, then skipping spares is both
1915 * dangerous and fairly pointless.
1916 * Dangerous because a device that was removed from the array
1917 * might have a event_count that still looks up-to-date,
1918 * so it can be re-added without a resync.
1919 * Pointless because if there are any spares to skip,
1920 * then a recovery will happen and soon that array won't
1921 * be degraded any more and the spare can go back to sleep then.
1922 */
1923 nospares = 0;
1924
1925 sync_req = mddev->in_sync;
1926 mddev->utime = get_seconds();
1927
1928 /* If this is just a dirty<->clean transition, and the array is clean
1929 * and 'events' is odd, we can roll back to the previous clean state */
1930 if (nospares
1931 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1932 && (mddev->events & 1)
1933 && mddev->events != 1)
1934 mddev->events--;
1935 else {
1936 /* otherwise we have to go forward and ... */
1937 mddev->events ++;
1938 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1939 /* .. if the array isn't clean, insist on an odd 'events' */
1940 if ((mddev->events&1)==0) {
1941 mddev->events++;
1942 nospares = 0;
1943 }
1944 } else {
1945 /* otherwise insist on an even 'events' (for clean states) */
1946 if ((mddev->events&1)) {
1947 mddev->events++;
1948 nospares = 0;
1949 }
1950 }
1951 }
1952
1953 if (!mddev->events) {
1954 /*
1955 * oops, this 64-bit counter should never wrap.
1956 * Either we are in around ~1 trillion A.C., assuming
1957 * 1 reboot per second, or we have a bug:
1958 */
1959 MD_BUG();
1960 mddev->events --;
1961 }
1962
1963 /*
1964 * do not write anything to disk if using
1965 * nonpersistent superblocks
1966 */
1967 if (!mddev->persistent) {
1968 if (!mddev->external)
1969 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1970
1971 spin_unlock_irq(&mddev->write_lock);
1972 wake_up(&mddev->sb_wait);
1973 return;
1974 }
1975 sync_sbs(mddev, nospares);
1976 spin_unlock_irq(&mddev->write_lock);
1977
1978 dprintk(KERN_INFO
1979 "md: updating %s RAID superblock on device (in sync %d)\n",
1980 mdname(mddev),mddev->in_sync);
1981
1982 bitmap_update_sb(mddev->bitmap);
1983 list_for_each_entry(rdev, &mddev->disks, same_set) {
1984 char b[BDEVNAME_SIZE];
1985 dprintk(KERN_INFO "md: ");
1986 if (rdev->sb_loaded != 1)
1987 continue; /* no noise on spare devices */
1988 if (test_bit(Faulty, &rdev->flags))
1989 dprintk("(skipping faulty ");
1990
1991 dprintk("%s ", bdevname(rdev->bdev,b));
1992 if (!test_bit(Faulty, &rdev->flags)) {
1993 md_super_write(mddev,rdev,
1994 rdev->sb_start, rdev->sb_size,
1995 rdev->sb_page);
1996 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1997 bdevname(rdev->bdev,b),
1998 (unsigned long long)rdev->sb_start);
1999 rdev->sb_events = mddev->events;
2000
2001 } else
2002 dprintk(")\n");
2003 if (mddev->level == LEVEL_MULTIPATH)
2004 /* only need to write one superblock... */
2005 break;
2006 }
2007 md_super_wait(mddev);
2008 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2009
2010 spin_lock_irq(&mddev->write_lock);
2011 if (mddev->in_sync != sync_req ||
2012 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2013 /* have to write it out again */
2014 spin_unlock_irq(&mddev->write_lock);
2015 goto repeat;
2016 }
2017 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2018 spin_unlock_irq(&mddev->write_lock);
2019 wake_up(&mddev->sb_wait);
2020 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2021 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2022
2023 }
2024
2025 /* words written to sysfs files may, or may not, be \n terminated.
2026 * We want to accept with case. For this we use cmd_match.
2027 */
2028 static int cmd_match(const char *cmd, const char *str)
2029 {
2030 /* See if cmd, written into a sysfs file, matches
2031 * str. They must either be the same, or cmd can
2032 * have a trailing newline
2033 */
2034 while (*cmd && *str && *cmd == *str) {
2035 cmd++;
2036 str++;
2037 }
2038 if (*cmd == '\n')
2039 cmd++;
2040 if (*str || *cmd)
2041 return 0;
2042 return 1;
2043 }
2044
2045 struct rdev_sysfs_entry {
2046 struct attribute attr;
2047 ssize_t (*show)(mdk_rdev_t *, char *);
2048 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2049 };
2050
2051 static ssize_t
2052 state_show(mdk_rdev_t *rdev, char *page)
2053 {
2054 char *sep = "";
2055 size_t len = 0;
2056
2057 if (test_bit(Faulty, &rdev->flags)) {
2058 len+= sprintf(page+len, "%sfaulty",sep);
2059 sep = ",";
2060 }
2061 if (test_bit(In_sync, &rdev->flags)) {
2062 len += sprintf(page+len, "%sin_sync",sep);
2063 sep = ",";
2064 }
2065 if (test_bit(WriteMostly, &rdev->flags)) {
2066 len += sprintf(page+len, "%swrite_mostly",sep);
2067 sep = ",";
2068 }
2069 if (test_bit(Blocked, &rdev->flags)) {
2070 len += sprintf(page+len, "%sblocked", sep);
2071 sep = ",";
2072 }
2073 if (!test_bit(Faulty, &rdev->flags) &&
2074 !test_bit(In_sync, &rdev->flags)) {
2075 len += sprintf(page+len, "%sspare", sep);
2076 sep = ",";
2077 }
2078 return len+sprintf(page+len, "\n");
2079 }
2080
2081 static ssize_t
2082 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2083 {
2084 /* can write
2085 * faulty - simulates and error
2086 * remove - disconnects the device
2087 * writemostly - sets write_mostly
2088 * -writemostly - clears write_mostly
2089 * blocked - sets the Blocked flag
2090 * -blocked - clears the Blocked flag
2091 * insync - sets Insync providing device isn't active
2092 */
2093 int err = -EINVAL;
2094 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2095 md_error(rdev->mddev, rdev);
2096 err = 0;
2097 } else if (cmd_match(buf, "remove")) {
2098 if (rdev->raid_disk >= 0)
2099 err = -EBUSY;
2100 else {
2101 mddev_t *mddev = rdev->mddev;
2102 kick_rdev_from_array(rdev);
2103 if (mddev->pers)
2104 md_update_sb(mddev, 1);
2105 md_new_event(mddev);
2106 err = 0;
2107 }
2108 } else if (cmd_match(buf, "writemostly")) {
2109 set_bit(WriteMostly, &rdev->flags);
2110 err = 0;
2111 } else if (cmd_match(buf, "-writemostly")) {
2112 clear_bit(WriteMostly, &rdev->flags);
2113 err = 0;
2114 } else if (cmd_match(buf, "blocked")) {
2115 set_bit(Blocked, &rdev->flags);
2116 err = 0;
2117 } else if (cmd_match(buf, "-blocked")) {
2118 clear_bit(Blocked, &rdev->flags);
2119 wake_up(&rdev->blocked_wait);
2120 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2121 md_wakeup_thread(rdev->mddev->thread);
2122
2123 err = 0;
2124 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2125 set_bit(In_sync, &rdev->flags);
2126 err = 0;
2127 }
2128 if (!err && rdev->sysfs_state)
2129 sysfs_notify_dirent(rdev->sysfs_state);
2130 return err ? err : len;
2131 }
2132 static struct rdev_sysfs_entry rdev_state =
2133 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2134
2135 static ssize_t
2136 errors_show(mdk_rdev_t *rdev, char *page)
2137 {
2138 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2139 }
2140
2141 static ssize_t
2142 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2143 {
2144 char *e;
2145 unsigned long n = simple_strtoul(buf, &e, 10);
2146 if (*buf && (*e == 0 || *e == '\n')) {
2147 atomic_set(&rdev->corrected_errors, n);
2148 return len;
2149 }
2150 return -EINVAL;
2151 }
2152 static struct rdev_sysfs_entry rdev_errors =
2153 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2154
2155 static ssize_t
2156 slot_show(mdk_rdev_t *rdev, char *page)
2157 {
2158 if (rdev->raid_disk < 0)
2159 return sprintf(page, "none\n");
2160 else
2161 return sprintf(page, "%d\n", rdev->raid_disk);
2162 }
2163
2164 static ssize_t
2165 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2166 {
2167 char *e;
2168 int err;
2169 char nm[20];
2170 int slot = simple_strtoul(buf, &e, 10);
2171 if (strncmp(buf, "none", 4)==0)
2172 slot = -1;
2173 else if (e==buf || (*e && *e!= '\n'))
2174 return -EINVAL;
2175 if (rdev->mddev->pers && slot == -1) {
2176 /* Setting 'slot' on an active array requires also
2177 * updating the 'rd%d' link, and communicating
2178 * with the personality with ->hot_*_disk.
2179 * For now we only support removing
2180 * failed/spare devices. This normally happens automatically,
2181 * but not when the metadata is externally managed.
2182 */
2183 if (rdev->raid_disk == -1)
2184 return -EEXIST;
2185 /* personality does all needed checks */
2186 if (rdev->mddev->pers->hot_add_disk == NULL)
2187 return -EINVAL;
2188 err = rdev->mddev->pers->
2189 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2190 if (err)
2191 return err;
2192 sprintf(nm, "rd%d", rdev->raid_disk);
2193 sysfs_remove_link(&rdev->mddev->kobj, nm);
2194 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2195 md_wakeup_thread(rdev->mddev->thread);
2196 } else if (rdev->mddev->pers) {
2197 mdk_rdev_t *rdev2;
2198 /* Activating a spare .. or possibly reactivating
2199 * if we ever get bitmaps working here.
2200 */
2201
2202 if (rdev->raid_disk != -1)
2203 return -EBUSY;
2204
2205 if (rdev->mddev->pers->hot_add_disk == NULL)
2206 return -EINVAL;
2207
2208 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2209 if (rdev2->raid_disk == slot)
2210 return -EEXIST;
2211
2212 rdev->raid_disk = slot;
2213 if (test_bit(In_sync, &rdev->flags))
2214 rdev->saved_raid_disk = slot;
2215 else
2216 rdev->saved_raid_disk = -1;
2217 err = rdev->mddev->pers->
2218 hot_add_disk(rdev->mddev, rdev);
2219 if (err) {
2220 rdev->raid_disk = -1;
2221 return err;
2222 } else
2223 sysfs_notify_dirent(rdev->sysfs_state);
2224 sprintf(nm, "rd%d", rdev->raid_disk);
2225 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2226 printk(KERN_WARNING
2227 "md: cannot register "
2228 "%s for %s\n",
2229 nm, mdname(rdev->mddev));
2230
2231 /* don't wakeup anyone, leave that to userspace. */
2232 } else {
2233 if (slot >= rdev->mddev->raid_disks)
2234 return -ENOSPC;
2235 rdev->raid_disk = slot;
2236 /* assume it is working */
2237 clear_bit(Faulty, &rdev->flags);
2238 clear_bit(WriteMostly, &rdev->flags);
2239 set_bit(In_sync, &rdev->flags);
2240 sysfs_notify_dirent(rdev->sysfs_state);
2241 }
2242 return len;
2243 }
2244
2245
2246 static struct rdev_sysfs_entry rdev_slot =
2247 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2248
2249 static ssize_t
2250 offset_show(mdk_rdev_t *rdev, char *page)
2251 {
2252 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2253 }
2254
2255 static ssize_t
2256 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2257 {
2258 char *e;
2259 unsigned long long offset = simple_strtoull(buf, &e, 10);
2260 if (e==buf || (*e && *e != '\n'))
2261 return -EINVAL;
2262 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2263 return -EBUSY;
2264 if (rdev->sectors && rdev->mddev->external)
2265 /* Must set offset before size, so overlap checks
2266 * can be sane */
2267 return -EBUSY;
2268 rdev->data_offset = offset;
2269 return len;
2270 }
2271
2272 static struct rdev_sysfs_entry rdev_offset =
2273 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2274
2275 static ssize_t
2276 rdev_size_show(mdk_rdev_t *rdev, char *page)
2277 {
2278 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2279 }
2280
2281 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2282 {
2283 /* check if two start/length pairs overlap */
2284 if (s1+l1 <= s2)
2285 return 0;
2286 if (s2+l2 <= s1)
2287 return 0;
2288 return 1;
2289 }
2290
2291 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2292 {
2293 unsigned long long blocks;
2294 sector_t new;
2295
2296 if (strict_strtoull(buf, 10, &blocks) < 0)
2297 return -EINVAL;
2298
2299 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2300 return -EINVAL; /* sector conversion overflow */
2301
2302 new = blocks * 2;
2303 if (new != blocks * 2)
2304 return -EINVAL; /* unsigned long long to sector_t overflow */
2305
2306 *sectors = new;
2307 return 0;
2308 }
2309
2310 static ssize_t
2311 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2312 {
2313 mddev_t *my_mddev = rdev->mddev;
2314 sector_t oldsectors = rdev->sectors;
2315 sector_t sectors;
2316
2317 if (strict_blocks_to_sectors(buf, &sectors) < 0)
2318 return -EINVAL;
2319 if (my_mddev->pers && rdev->raid_disk >= 0) {
2320 if (my_mddev->persistent) {
2321 sectors = super_types[my_mddev->major_version].
2322 rdev_size_change(rdev, sectors);
2323 if (!sectors)
2324 return -EBUSY;
2325 } else if (!sectors)
2326 sectors = (rdev->bdev->bd_inode->i_size >> 9) -
2327 rdev->data_offset;
2328 }
2329 if (sectors < my_mddev->dev_sectors)
2330 return -EINVAL; /* component must fit device */
2331
2332 rdev->sectors = sectors;
2333 if (sectors > oldsectors && my_mddev->external) {
2334 /* need to check that all other rdevs with the same ->bdev
2335 * do not overlap. We need to unlock the mddev to avoid
2336 * a deadlock. We have already changed rdev->sectors, and if
2337 * we have to change it back, we will have the lock again.
2338 */
2339 mddev_t *mddev;
2340 int overlap = 0;
2341 struct list_head *tmp;
2342
2343 mddev_unlock(my_mddev);
2344 for_each_mddev(mddev, tmp) {
2345 mdk_rdev_t *rdev2;
2346
2347 mddev_lock(mddev);
2348 list_for_each_entry(rdev2, &mddev->disks, same_set)
2349 if (test_bit(AllReserved, &rdev2->flags) ||
2350 (rdev->bdev == rdev2->bdev &&
2351 rdev != rdev2 &&
2352 overlaps(rdev->data_offset, rdev->sectors,
2353 rdev2->data_offset,
2354 rdev2->sectors))) {
2355 overlap = 1;
2356 break;
2357 }
2358 mddev_unlock(mddev);
2359 if (overlap) {
2360 mddev_put(mddev);
2361 break;
2362 }
2363 }
2364 mddev_lock(my_mddev);
2365 if (overlap) {
2366 /* Someone else could have slipped in a size
2367 * change here, but doing so is just silly.
2368 * We put oldsectors back because we *know* it is
2369 * safe, and trust userspace not to race with
2370 * itself
2371 */
2372 rdev->sectors = oldsectors;
2373 return -EBUSY;
2374 }
2375 }
2376 return len;
2377 }
2378
2379 static struct rdev_sysfs_entry rdev_size =
2380 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2381
2382 static struct attribute *rdev_default_attrs[] = {
2383 &rdev_state.attr,
2384 &rdev_errors.attr,
2385 &rdev_slot.attr,
2386 &rdev_offset.attr,
2387 &rdev_size.attr,
2388 NULL,
2389 };
2390 static ssize_t
2391 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2392 {
2393 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2394 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2395 mddev_t *mddev = rdev->mddev;
2396 ssize_t rv;
2397
2398 if (!entry->show)
2399 return -EIO;
2400
2401 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2402 if (!rv) {
2403 if (rdev->mddev == NULL)
2404 rv = -EBUSY;
2405 else
2406 rv = entry->show(rdev, page);
2407 mddev_unlock(mddev);
2408 }
2409 return rv;
2410 }
2411
2412 static ssize_t
2413 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2414 const char *page, size_t length)
2415 {
2416 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2417 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2418 ssize_t rv;
2419 mddev_t *mddev = rdev->mddev;
2420
2421 if (!entry->store)
2422 return -EIO;
2423 if (!capable(CAP_SYS_ADMIN))
2424 return -EACCES;
2425 rv = mddev ? mddev_lock(mddev): -EBUSY;
2426 if (!rv) {
2427 if (rdev->mddev == NULL)
2428 rv = -EBUSY;
2429 else
2430 rv = entry->store(rdev, page, length);
2431 mddev_unlock(mddev);
2432 }
2433 return rv;
2434 }
2435
2436 static void rdev_free(struct kobject *ko)
2437 {
2438 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2439 kfree(rdev);
2440 }
2441 static struct sysfs_ops rdev_sysfs_ops = {
2442 .show = rdev_attr_show,
2443 .store = rdev_attr_store,
2444 };
2445 static struct kobj_type rdev_ktype = {
2446 .release = rdev_free,
2447 .sysfs_ops = &rdev_sysfs_ops,
2448 .default_attrs = rdev_default_attrs,
2449 };
2450
2451 /*
2452 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2453 *
2454 * mark the device faulty if:
2455 *
2456 * - the device is nonexistent (zero size)
2457 * - the device has no valid superblock
2458 *
2459 * a faulty rdev _never_ has rdev->sb set.
2460 */
2461 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2462 {
2463 char b[BDEVNAME_SIZE];
2464 int err;
2465 mdk_rdev_t *rdev;
2466 sector_t size;
2467
2468 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2469 if (!rdev) {
2470 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2471 return ERR_PTR(-ENOMEM);
2472 }
2473
2474 if ((err = alloc_disk_sb(rdev)))
2475 goto abort_free;
2476
2477 err = lock_rdev(rdev, newdev, super_format == -2);
2478 if (err)
2479 goto abort_free;
2480
2481 kobject_init(&rdev->kobj, &rdev_ktype);
2482
2483 rdev->desc_nr = -1;
2484 rdev->saved_raid_disk = -1;
2485 rdev->raid_disk = -1;
2486 rdev->flags = 0;
2487 rdev->data_offset = 0;
2488 rdev->sb_events = 0;
2489 atomic_set(&rdev->nr_pending, 0);
2490 atomic_set(&rdev->read_errors, 0);
2491 atomic_set(&rdev->corrected_errors, 0);
2492
2493 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2494 if (!size) {
2495 printk(KERN_WARNING
2496 "md: %s has zero or unknown size, marking faulty!\n",
2497 bdevname(rdev->bdev,b));
2498 err = -EINVAL;
2499 goto abort_free;
2500 }
2501
2502 if (super_format >= 0) {
2503 err = super_types[super_format].
2504 load_super(rdev, NULL, super_minor);
2505 if (err == -EINVAL) {
2506 printk(KERN_WARNING
2507 "md: %s does not have a valid v%d.%d "
2508 "superblock, not importing!\n",
2509 bdevname(rdev->bdev,b),
2510 super_format, super_minor);
2511 goto abort_free;
2512 }
2513 if (err < 0) {
2514 printk(KERN_WARNING
2515 "md: could not read %s's sb, not importing!\n",
2516 bdevname(rdev->bdev,b));
2517 goto abort_free;
2518 }
2519 }
2520
2521 INIT_LIST_HEAD(&rdev->same_set);
2522 init_waitqueue_head(&rdev->blocked_wait);
2523
2524 return rdev;
2525
2526 abort_free:
2527 if (rdev->sb_page) {
2528 if (rdev->bdev)
2529 unlock_rdev(rdev);
2530 free_disk_sb(rdev);
2531 }
2532 kfree(rdev);
2533 return ERR_PTR(err);
2534 }
2535
2536 /*
2537 * Check a full RAID array for plausibility
2538 */
2539
2540
2541 static void analyze_sbs(mddev_t * mddev)
2542 {
2543 int i;
2544 mdk_rdev_t *rdev, *freshest, *tmp;
2545 char b[BDEVNAME_SIZE];
2546
2547 freshest = NULL;
2548 rdev_for_each(rdev, tmp, mddev)
2549 switch (super_types[mddev->major_version].
2550 load_super(rdev, freshest, mddev->minor_version)) {
2551 case 1:
2552 freshest = rdev;
2553 break;
2554 case 0:
2555 break;
2556 default:
2557 printk( KERN_ERR \
2558 "md: fatal superblock inconsistency in %s"
2559 " -- removing from array\n",
2560 bdevname(rdev->bdev,b));
2561 kick_rdev_from_array(rdev);
2562 }
2563
2564
2565 super_types[mddev->major_version].
2566 validate_super(mddev, freshest);
2567
2568 i = 0;
2569 rdev_for_each(rdev, tmp, mddev) {
2570 if (rdev->desc_nr >= mddev->max_disks ||
2571 i > mddev->max_disks) {
2572 printk(KERN_WARNING
2573 "md: %s: %s: only %d devices permitted\n",
2574 mdname(mddev), bdevname(rdev->bdev, b),
2575 mddev->max_disks);
2576 kick_rdev_from_array(rdev);
2577 continue;
2578 }
2579 if (rdev != freshest)
2580 if (super_types[mddev->major_version].
2581 validate_super(mddev, rdev)) {
2582 printk(KERN_WARNING "md: kicking non-fresh %s"
2583 " from array!\n",
2584 bdevname(rdev->bdev,b));
2585 kick_rdev_from_array(rdev);
2586 continue;
2587 }
2588 if (mddev->level == LEVEL_MULTIPATH) {
2589 rdev->desc_nr = i++;
2590 rdev->raid_disk = rdev->desc_nr;
2591 set_bit(In_sync, &rdev->flags);
2592 } else if (rdev->raid_disk >= mddev->raid_disks) {
2593 rdev->raid_disk = -1;
2594 clear_bit(In_sync, &rdev->flags);
2595 }
2596 }
2597
2598
2599
2600 if (mddev->recovery_cp != MaxSector &&
2601 mddev->level >= 1)
2602 printk(KERN_ERR "md: %s: raid array is not clean"
2603 " -- starting background reconstruction\n",
2604 mdname(mddev));
2605
2606 }
2607
2608 static void md_safemode_timeout(unsigned long data);
2609
2610 static ssize_t
2611 safe_delay_show(mddev_t *mddev, char *page)
2612 {
2613 int msec = (mddev->safemode_delay*1000)/HZ;
2614 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2615 }
2616 static ssize_t
2617 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2618 {
2619 int scale=1;
2620 int dot=0;
2621 int i;
2622 unsigned long msec;
2623 char buf[30];
2624
2625 /* remove a period, and count digits after it */
2626 if (len >= sizeof(buf))
2627 return -EINVAL;
2628 strlcpy(buf, cbuf, sizeof(buf));
2629 for (i=0; i<len; i++) {
2630 if (dot) {
2631 if (isdigit(buf[i])) {
2632 buf[i-1] = buf[i];
2633 scale *= 10;
2634 }
2635 buf[i] = 0;
2636 } else if (buf[i] == '.') {
2637 dot=1;
2638 buf[i] = 0;
2639 }
2640 }
2641 if (strict_strtoul(buf, 10, &msec) < 0)
2642 return -EINVAL;
2643 msec = (msec * 1000) / scale;
2644 if (msec == 0)
2645 mddev->safemode_delay = 0;
2646 else {
2647 unsigned long old_delay = mddev->safemode_delay;
2648 mddev->safemode_delay = (msec*HZ)/1000;
2649 if (mddev->safemode_delay == 0)
2650 mddev->safemode_delay = 1;
2651 if (mddev->safemode_delay < old_delay)
2652 md_safemode_timeout((unsigned long)mddev);
2653 }
2654 return len;
2655 }
2656 static struct md_sysfs_entry md_safe_delay =
2657 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2658
2659 static ssize_t
2660 level_show(mddev_t *mddev, char *page)
2661 {
2662 struct mdk_personality *p = mddev->pers;
2663 if (p)
2664 return sprintf(page, "%s\n", p->name);
2665 else if (mddev->clevel[0])
2666 return sprintf(page, "%s\n", mddev->clevel);
2667 else if (mddev->level != LEVEL_NONE)
2668 return sprintf(page, "%d\n", mddev->level);
2669 else
2670 return 0;
2671 }
2672
2673 static ssize_t
2674 level_store(mddev_t *mddev, const char *buf, size_t len)
2675 {
2676 char level[16];
2677 ssize_t rv = len;
2678 struct mdk_personality *pers;
2679 void *priv;
2680
2681 if (mddev->pers == NULL) {
2682 if (len == 0)
2683 return 0;
2684 if (len >= sizeof(mddev->clevel))
2685 return -ENOSPC;
2686 strncpy(mddev->clevel, buf, len);
2687 if (mddev->clevel[len-1] == '\n')
2688 len--;
2689 mddev->clevel[len] = 0;
2690 mddev->level = LEVEL_NONE;
2691 return rv;
2692 }
2693
2694 /* request to change the personality. Need to ensure:
2695 * - array is not engaged in resync/recovery/reshape
2696 * - old personality can be suspended
2697 * - new personality will access other array.
2698 */
2699
2700 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
2701 return -EBUSY;
2702
2703 if (!mddev->pers->quiesce) {
2704 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
2705 mdname(mddev), mddev->pers->name);
2706 return -EINVAL;
2707 }
2708
2709 /* Now find the new personality */
2710 if (len == 0 || len >= sizeof(level))
2711 return -EINVAL;
2712 strncpy(level, buf, len);
2713 if (level[len-1] == '\n')
2714 len--;
2715 level[len] = 0;
2716
2717 request_module("md-%s", level);
2718 spin_lock(&pers_lock);
2719 pers = find_pers(LEVEL_NONE, level);
2720 if (!pers || !try_module_get(pers->owner)) {
2721 spin_unlock(&pers_lock);
2722 printk(KERN_WARNING "md: personality %s not loaded\n", level);
2723 return -EINVAL;
2724 }
2725 spin_unlock(&pers_lock);
2726
2727 if (pers == mddev->pers) {
2728 /* Nothing to do! */
2729 module_put(pers->owner);
2730 return rv;
2731 }
2732 if (!pers->takeover) {
2733 module_put(pers->owner);
2734 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
2735 mdname(mddev), level);
2736 return -EINVAL;
2737 }
2738
2739 /* ->takeover must set new_* and/or delta_disks
2740 * if it succeeds, and may set them when it fails.
2741 */
2742 priv = pers->takeover(mddev);
2743 if (IS_ERR(priv)) {
2744 mddev->new_level = mddev->level;
2745 mddev->new_layout = mddev->layout;
2746 mddev->new_chunk = mddev->chunk_size;
2747 mddev->raid_disks -= mddev->delta_disks;
2748 mddev->delta_disks = 0;
2749 module_put(pers->owner);
2750 printk(KERN_WARNING "md: %s: %s would not accept array\n",
2751 mdname(mddev), level);
2752 return PTR_ERR(priv);
2753 }
2754
2755 /* Looks like we have a winner */
2756 mddev_suspend(mddev);
2757 mddev->pers->stop(mddev);
2758 module_put(mddev->pers->owner);
2759 mddev->pers = pers;
2760 mddev->private = priv;
2761 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
2762 mddev->level = mddev->new_level;
2763 mddev->layout = mddev->new_layout;
2764 mddev->chunk_size = mddev->new_chunk;
2765 mddev->delta_disks = 0;
2766 pers->run(mddev);
2767 mddev_resume(mddev);
2768 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2769 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2770 md_wakeup_thread(mddev->thread);
2771 return rv;
2772 }
2773
2774 static struct md_sysfs_entry md_level =
2775 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2776
2777
2778 static ssize_t
2779 layout_show(mddev_t *mddev, char *page)
2780 {
2781 /* just a number, not meaningful for all levels */
2782 if (mddev->reshape_position != MaxSector &&
2783 mddev->layout != mddev->new_layout)
2784 return sprintf(page, "%d (%d)\n",
2785 mddev->new_layout, mddev->layout);
2786 return sprintf(page, "%d\n", mddev->layout);
2787 }
2788
2789 static ssize_t
2790 layout_store(mddev_t *mddev, const char *buf, size_t len)
2791 {
2792 char *e;
2793 unsigned long n = simple_strtoul(buf, &e, 10);
2794
2795 if (!*buf || (*e && *e != '\n'))
2796 return -EINVAL;
2797
2798 if (mddev->pers) {
2799 int err;
2800 if (mddev->pers->reconfig == NULL)
2801 return -EBUSY;
2802 err = mddev->pers->reconfig(mddev, n, -1);
2803 if (err)
2804 return err;
2805 } else {
2806 mddev->new_layout = n;
2807 if (mddev->reshape_position == MaxSector)
2808 mddev->layout = n;
2809 }
2810 return len;
2811 }
2812 static struct md_sysfs_entry md_layout =
2813 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2814
2815
2816 static ssize_t
2817 raid_disks_show(mddev_t *mddev, char *page)
2818 {
2819 if (mddev->raid_disks == 0)
2820 return 0;
2821 if (mddev->reshape_position != MaxSector &&
2822 mddev->delta_disks != 0)
2823 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2824 mddev->raid_disks - mddev->delta_disks);
2825 return sprintf(page, "%d\n", mddev->raid_disks);
2826 }
2827
2828 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2829
2830 static ssize_t
2831 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2832 {
2833 char *e;
2834 int rv = 0;
2835 unsigned long n = simple_strtoul(buf, &e, 10);
2836
2837 if (!*buf || (*e && *e != '\n'))
2838 return -EINVAL;
2839
2840 if (mddev->pers)
2841 rv = update_raid_disks(mddev, n);
2842 else if (mddev->reshape_position != MaxSector) {
2843 int olddisks = mddev->raid_disks - mddev->delta_disks;
2844 mddev->delta_disks = n - olddisks;
2845 mddev->raid_disks = n;
2846 } else
2847 mddev->raid_disks = n;
2848 return rv ? rv : len;
2849 }
2850 static struct md_sysfs_entry md_raid_disks =
2851 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2852
2853 static ssize_t
2854 chunk_size_show(mddev_t *mddev, char *page)
2855 {
2856 if (mddev->reshape_position != MaxSector &&
2857 mddev->chunk_size != mddev->new_chunk)
2858 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2859 mddev->chunk_size);
2860 return sprintf(page, "%d\n", mddev->chunk_size);
2861 }
2862
2863 static ssize_t
2864 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2865 {
2866 char *e;
2867 unsigned long n = simple_strtoul(buf, &e, 10);
2868
2869 if (!*buf || (*e && *e != '\n'))
2870 return -EINVAL;
2871
2872 if (mddev->pers) {
2873 int err;
2874 if (mddev->pers->reconfig == NULL)
2875 return -EBUSY;
2876 err = mddev->pers->reconfig(mddev, -1, n);
2877 if (err)
2878 return err;
2879 } else {
2880 mddev->new_chunk = n;
2881 if (mddev->reshape_position == MaxSector)
2882 mddev->chunk_size = n;
2883 }
2884 return len;
2885 }
2886 static struct md_sysfs_entry md_chunk_size =
2887 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2888
2889 static ssize_t
2890 resync_start_show(mddev_t *mddev, char *page)
2891 {
2892 if (mddev->recovery_cp == MaxSector)
2893 return sprintf(page, "none\n");
2894 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2895 }
2896
2897 static ssize_t
2898 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2899 {
2900 char *e;
2901 unsigned long long n = simple_strtoull(buf, &e, 10);
2902
2903 if (mddev->pers)
2904 return -EBUSY;
2905 if (!*buf || (*e && *e != '\n'))
2906 return -EINVAL;
2907
2908 mddev->recovery_cp = n;
2909 return len;
2910 }
2911 static struct md_sysfs_entry md_resync_start =
2912 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2913
2914 /*
2915 * The array state can be:
2916 *
2917 * clear
2918 * No devices, no size, no level
2919 * Equivalent to STOP_ARRAY ioctl
2920 * inactive
2921 * May have some settings, but array is not active
2922 * all IO results in error
2923 * When written, doesn't tear down array, but just stops it
2924 * suspended (not supported yet)
2925 * All IO requests will block. The array can be reconfigured.
2926 * Writing this, if accepted, will block until array is quiescent
2927 * readonly
2928 * no resync can happen. no superblocks get written.
2929 * write requests fail
2930 * read-auto
2931 * like readonly, but behaves like 'clean' on a write request.
2932 *
2933 * clean - no pending writes, but otherwise active.
2934 * When written to inactive array, starts without resync
2935 * If a write request arrives then
2936 * if metadata is known, mark 'dirty' and switch to 'active'.
2937 * if not known, block and switch to write-pending
2938 * If written to an active array that has pending writes, then fails.
2939 * active
2940 * fully active: IO and resync can be happening.
2941 * When written to inactive array, starts with resync
2942 *
2943 * write-pending
2944 * clean, but writes are blocked waiting for 'active' to be written.
2945 *
2946 * active-idle
2947 * like active, but no writes have been seen for a while (100msec).
2948 *
2949 */
2950 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2951 write_pending, active_idle, bad_word};
2952 static char *array_states[] = {
2953 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2954 "write-pending", "active-idle", NULL };
2955
2956 static int match_word(const char *word, char **list)
2957 {
2958 int n;
2959 for (n=0; list[n]; n++)
2960 if (cmd_match(word, list[n]))
2961 break;
2962 return n;
2963 }
2964
2965 static ssize_t
2966 array_state_show(mddev_t *mddev, char *page)
2967 {
2968 enum array_state st = inactive;
2969
2970 if (mddev->pers)
2971 switch(mddev->ro) {
2972 case 1:
2973 st = readonly;
2974 break;
2975 case 2:
2976 st = read_auto;
2977 break;
2978 case 0:
2979 if (mddev->in_sync)
2980 st = clean;
2981 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
2982 st = write_pending;
2983 else if (mddev->safemode)
2984 st = active_idle;
2985 else
2986 st = active;
2987 }
2988 else {
2989 if (list_empty(&mddev->disks) &&
2990 mddev->raid_disks == 0 &&
2991 mddev->dev_sectors == 0)
2992 st = clear;
2993 else
2994 st = inactive;
2995 }
2996 return sprintf(page, "%s\n", array_states[st]);
2997 }
2998
2999 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
3000 static int do_md_run(mddev_t * mddev);
3001 static int restart_array(mddev_t *mddev);
3002
3003 static ssize_t
3004 array_state_store(mddev_t *mddev, const char *buf, size_t len)
3005 {
3006 int err = -EINVAL;
3007 enum array_state st = match_word(buf, array_states);
3008 switch(st) {
3009 case bad_word:
3010 break;
3011 case clear:
3012 /* stopping an active array */
3013 if (atomic_read(&mddev->openers) > 0)
3014 return -EBUSY;
3015 err = do_md_stop(mddev, 0, 0);
3016 break;
3017 case inactive:
3018 /* stopping an active array */
3019 if (mddev->pers) {
3020 if (atomic_read(&mddev->openers) > 0)
3021 return -EBUSY;
3022 err = do_md_stop(mddev, 2, 0);
3023 } else
3024 err = 0; /* already inactive */
3025 break;
3026 case suspended:
3027 break; /* not supported yet */
3028 case readonly:
3029 if (mddev->pers)
3030 err = do_md_stop(mddev, 1, 0);
3031 else {
3032 mddev->ro = 1;
3033 set_disk_ro(mddev->gendisk, 1);
3034 err = do_md_run(mddev);
3035 }
3036 break;
3037 case read_auto:
3038 if (mddev->pers) {
3039 if (mddev->ro == 0)
3040 err = do_md_stop(mddev, 1, 0);
3041 else if (mddev->ro == 1)
3042 err = restart_array(mddev);
3043 if (err == 0) {
3044 mddev->ro = 2;
3045 set_disk_ro(mddev->gendisk, 0);
3046 }
3047 } else {
3048 mddev->ro = 2;
3049 err = do_md_run(mddev);
3050 }
3051 break;
3052 case clean:
3053 if (mddev->pers) {
3054 restart_array(mddev);
3055 spin_lock_irq(&mddev->write_lock);
3056 if (atomic_read(&mddev->writes_pending) == 0) {
3057 if (mddev->in_sync == 0) {
3058 mddev->in_sync = 1;
3059 if (mddev->safemode == 1)
3060 mddev->safemode = 0;
3061 if (mddev->persistent)
3062 set_bit(MD_CHANGE_CLEAN,
3063 &mddev->flags);
3064 }
3065 err = 0;
3066 } else
3067 err = -EBUSY;
3068 spin_unlock_irq(&mddev->write_lock);
3069 } else {
3070 mddev->ro = 0;
3071 mddev->recovery_cp = MaxSector;
3072 err = do_md_run(mddev);
3073 }
3074 break;
3075 case active:
3076 if (mddev->pers) {
3077 restart_array(mddev);
3078 if (mddev->external)
3079 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
3080 wake_up(&mddev->sb_wait);
3081 err = 0;
3082 } else {
3083 mddev->ro = 0;
3084 set_disk_ro(mddev->gendisk, 0);
3085 err = do_md_run(mddev);
3086 }
3087 break;
3088 case write_pending:
3089 case active_idle:
3090 /* these cannot be set */
3091 break;
3092 }
3093 if (err)
3094 return err;
3095 else {
3096 sysfs_notify_dirent(mddev->sysfs_state);
3097 return len;
3098 }
3099 }
3100 static struct md_sysfs_entry md_array_state =
3101 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3102
3103 static ssize_t
3104 null_show(mddev_t *mddev, char *page)
3105 {
3106 return -EINVAL;
3107 }
3108
3109 static ssize_t
3110 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3111 {
3112 /* buf must be %d:%d\n? giving major and minor numbers */
3113 /* The new device is added to the array.
3114 * If the array has a persistent superblock, we read the
3115 * superblock to initialise info and check validity.
3116 * Otherwise, only checking done is that in bind_rdev_to_array,
3117 * which mainly checks size.
3118 */
3119 char *e;
3120 int major = simple_strtoul(buf, &e, 10);
3121 int minor;
3122 dev_t dev;
3123 mdk_rdev_t *rdev;
3124 int err;
3125
3126 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3127 return -EINVAL;
3128 minor = simple_strtoul(e+1, &e, 10);
3129 if (*e && *e != '\n')
3130 return -EINVAL;
3131 dev = MKDEV(major, minor);
3132 if (major != MAJOR(dev) ||
3133 minor != MINOR(dev))
3134 return -EOVERFLOW;
3135
3136
3137 if (mddev->persistent) {
3138 rdev = md_import_device(dev, mddev->major_version,
3139 mddev->minor_version);
3140 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3141 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3142 mdk_rdev_t, same_set);
3143 err = super_types[mddev->major_version]
3144 .load_super(rdev, rdev0, mddev->minor_version);
3145 if (err < 0)
3146 goto out;
3147 }
3148 } else if (mddev->external)
3149 rdev = md_import_device(dev, -2, -1);
3150 else
3151 rdev = md_import_device(dev, -1, -1);
3152
3153 if (IS_ERR(rdev))
3154 return PTR_ERR(rdev);
3155 err = bind_rdev_to_array(rdev, mddev);
3156 out:
3157 if (err)
3158 export_rdev(rdev);
3159 return err ? err : len;
3160 }
3161
3162 static struct md_sysfs_entry md_new_device =
3163 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3164
3165 static ssize_t
3166 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3167 {
3168 char *end;
3169 unsigned long chunk, end_chunk;
3170
3171 if (!mddev->bitmap)
3172 goto out;
3173 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3174 while (*buf) {
3175 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3176 if (buf == end) break;
3177 if (*end == '-') { /* range */
3178 buf = end + 1;
3179 end_chunk = simple_strtoul(buf, &end, 0);
3180 if (buf == end) break;
3181 }
3182 if (*end && !isspace(*end)) break;
3183 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3184 buf = end;
3185 while (isspace(*buf)) buf++;
3186 }
3187 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3188 out:
3189 return len;
3190 }
3191
3192 static struct md_sysfs_entry md_bitmap =
3193 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3194
3195 static ssize_t
3196 size_show(mddev_t *mddev, char *page)
3197 {
3198 return sprintf(page, "%llu\n",
3199 (unsigned long long)mddev->dev_sectors / 2);
3200 }
3201
3202 static int update_size(mddev_t *mddev, sector_t num_sectors);
3203
3204 static ssize_t
3205 size_store(mddev_t *mddev, const char *buf, size_t len)
3206 {
3207 /* If array is inactive, we can reduce the component size, but
3208 * not increase it (except from 0).
3209 * If array is active, we can try an on-line resize
3210 */
3211 sector_t sectors;
3212 int err = strict_blocks_to_sectors(buf, &sectors);
3213
3214 if (err < 0)
3215 return err;
3216 if (mddev->pers) {
3217 err = update_size(mddev, sectors);
3218 md_update_sb(mddev, 1);
3219 } else {
3220 if (mddev->dev_sectors == 0 ||
3221 mddev->dev_sectors > sectors)
3222 mddev->dev_sectors = sectors;
3223 else
3224 err = -ENOSPC;
3225 }
3226 return err ? err : len;
3227 }
3228
3229 static struct md_sysfs_entry md_size =
3230 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3231
3232
3233 /* Metdata version.
3234 * This is one of
3235 * 'none' for arrays with no metadata (good luck...)
3236 * 'external' for arrays with externally managed metadata,
3237 * or N.M for internally known formats
3238 */
3239 static ssize_t
3240 metadata_show(mddev_t *mddev, char *page)
3241 {
3242 if (mddev->persistent)
3243 return sprintf(page, "%d.%d\n",
3244 mddev->major_version, mddev->minor_version);
3245 else if (mddev->external)
3246 return sprintf(page, "external:%s\n", mddev->metadata_type);
3247 else
3248 return sprintf(page, "none\n");
3249 }
3250
3251 static ssize_t
3252 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3253 {
3254 int major, minor;
3255 char *e;
3256 /* Changing the details of 'external' metadata is
3257 * always permitted. Otherwise there must be
3258 * no devices attached to the array.
3259 */
3260 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3261 ;
3262 else if (!list_empty(&mddev->disks))
3263 return -EBUSY;
3264
3265 if (cmd_match(buf, "none")) {
3266 mddev->persistent = 0;
3267 mddev->external = 0;
3268 mddev->major_version = 0;
3269 mddev->minor_version = 90;
3270 return len;
3271 }
3272 if (strncmp(buf, "external:", 9) == 0) {
3273 size_t namelen = len-9;
3274 if (namelen >= sizeof(mddev->metadata_type))
3275 namelen = sizeof(mddev->metadata_type)-1;
3276 strncpy(mddev->metadata_type, buf+9, namelen);
3277 mddev->metadata_type[namelen] = 0;
3278 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3279 mddev->metadata_type[--namelen] = 0;
3280 mddev->persistent = 0;
3281 mddev->external = 1;
3282 mddev->major_version = 0;
3283 mddev->minor_version = 90;
3284 return len;
3285 }
3286 major = simple_strtoul(buf, &e, 10);
3287 if (e==buf || *e != '.')
3288 return -EINVAL;
3289 buf = e+1;
3290 minor = simple_strtoul(buf, &e, 10);
3291 if (e==buf || (*e && *e != '\n') )
3292 return -EINVAL;
3293 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3294 return -ENOENT;
3295 mddev->major_version = major;
3296 mddev->minor_version = minor;
3297 mddev->persistent = 1;
3298 mddev->external = 0;
3299 return len;
3300 }
3301
3302 static struct md_sysfs_entry md_metadata =
3303 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3304
3305 static ssize_t
3306 action_show(mddev_t *mddev, char *page)
3307 {
3308 char *type = "idle";
3309 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3310 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3311 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3312 type = "reshape";
3313 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3314 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3315 type = "resync";
3316 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3317 type = "check";
3318 else
3319 type = "repair";
3320 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3321 type = "recover";
3322 }
3323 return sprintf(page, "%s\n", type);
3324 }
3325
3326 static ssize_t
3327 action_store(mddev_t *mddev, const char *page, size_t len)
3328 {
3329 if (!mddev->pers || !mddev->pers->sync_request)
3330 return -EINVAL;
3331
3332 if (cmd_match(page, "idle")) {
3333 if (mddev->sync_thread) {
3334 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3335 md_unregister_thread(mddev->sync_thread);
3336 mddev->sync_thread = NULL;
3337 mddev->recovery = 0;
3338 }
3339 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3340 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3341 return -EBUSY;
3342 else if (cmd_match(page, "resync"))
3343 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3344 else if (cmd_match(page, "recover")) {
3345 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3346 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3347 } else if (cmd_match(page, "reshape")) {
3348 int err;
3349 if (mddev->pers->start_reshape == NULL)
3350 return -EINVAL;
3351 err = mddev->pers->start_reshape(mddev);
3352 if (err)
3353 return err;
3354 sysfs_notify(&mddev->kobj, NULL, "degraded");
3355 } else {
3356 if (cmd_match(page, "check"))
3357 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3358 else if (!cmd_match(page, "repair"))
3359 return -EINVAL;
3360 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3361 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3362 }
3363 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3364 md_wakeup_thread(mddev->thread);
3365 sysfs_notify_dirent(mddev->sysfs_action);
3366 return len;
3367 }
3368
3369 static ssize_t
3370 mismatch_cnt_show(mddev_t *mddev, char *page)
3371 {
3372 return sprintf(page, "%llu\n",
3373 (unsigned long long) mddev->resync_mismatches);
3374 }
3375
3376 static struct md_sysfs_entry md_scan_mode =
3377 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3378
3379
3380 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3381
3382 static ssize_t
3383 sync_min_show(mddev_t *mddev, char *page)
3384 {
3385 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3386 mddev->sync_speed_min ? "local": "system");
3387 }
3388
3389 static ssize_t
3390 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3391 {
3392 int min;
3393 char *e;
3394 if (strncmp(buf, "system", 6)==0) {
3395 mddev->sync_speed_min = 0;
3396 return len;
3397 }
3398 min = simple_strtoul(buf, &e, 10);
3399 if (buf == e || (*e && *e != '\n') || min <= 0)
3400 return -EINVAL;
3401 mddev->sync_speed_min = min;
3402 return len;
3403 }
3404
3405 static struct md_sysfs_entry md_sync_min =
3406 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3407
3408 static ssize_t
3409 sync_max_show(mddev_t *mddev, char *page)
3410 {
3411 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3412 mddev->sync_speed_max ? "local": "system");
3413 }
3414
3415 static ssize_t
3416 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3417 {
3418 int max;
3419 char *e;
3420 if (strncmp(buf, "system", 6)==0) {
3421 mddev->sync_speed_max = 0;
3422 return len;
3423 }
3424 max = simple_strtoul(buf, &e, 10);
3425 if (buf == e || (*e && *e != '\n') || max <= 0)
3426 return -EINVAL;
3427 mddev->sync_speed_max = max;
3428 return len;
3429 }
3430
3431 static struct md_sysfs_entry md_sync_max =
3432 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3433
3434 static ssize_t
3435 degraded_show(mddev_t *mddev, char *page)
3436 {
3437 return sprintf(page, "%d\n", mddev->degraded);
3438 }
3439 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3440
3441 static ssize_t
3442 sync_force_parallel_show(mddev_t *mddev, char *page)
3443 {
3444 return sprintf(page, "%d\n", mddev->parallel_resync);
3445 }
3446
3447 static ssize_t
3448 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3449 {
3450 long n;
3451
3452 if (strict_strtol(buf, 10, &n))
3453 return -EINVAL;
3454
3455 if (n != 0 && n != 1)
3456 return -EINVAL;
3457
3458 mddev->parallel_resync = n;
3459
3460 if (mddev->sync_thread)
3461 wake_up(&resync_wait);
3462
3463 return len;
3464 }
3465
3466 /* force parallel resync, even with shared block devices */
3467 static struct md_sysfs_entry md_sync_force_parallel =
3468 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3469 sync_force_parallel_show, sync_force_parallel_store);
3470
3471 static ssize_t
3472 sync_speed_show(mddev_t *mddev, char *page)
3473 {
3474 unsigned long resync, dt, db;
3475 if (mddev->curr_resync == 0)
3476 return sprintf(page, "none\n");
3477 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3478 dt = (jiffies - mddev->resync_mark) / HZ;
3479 if (!dt) dt++;
3480 db = resync - mddev->resync_mark_cnt;
3481 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3482 }
3483
3484 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3485
3486 static ssize_t
3487 sync_completed_show(mddev_t *mddev, char *page)
3488 {
3489 unsigned long max_sectors, resync;
3490
3491 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3492 return sprintf(page, "none\n");
3493
3494 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3495 max_sectors = mddev->resync_max_sectors;
3496 else
3497 max_sectors = mddev->dev_sectors;
3498
3499 resync = mddev->curr_resync_completed;
3500 return sprintf(page, "%lu / %lu\n", resync, max_sectors);
3501 }
3502
3503 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3504
3505 static ssize_t
3506 min_sync_show(mddev_t *mddev, char *page)
3507 {
3508 return sprintf(page, "%llu\n",
3509 (unsigned long long)mddev->resync_min);
3510 }
3511 static ssize_t
3512 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3513 {
3514 unsigned long long min;
3515 if (strict_strtoull(buf, 10, &min))
3516 return -EINVAL;
3517 if (min > mddev->resync_max)
3518 return -EINVAL;
3519 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3520 return -EBUSY;
3521
3522 /* Must be a multiple of chunk_size */
3523 if (mddev->chunk_size) {
3524 if (min & (sector_t)((mddev->chunk_size>>9)-1))
3525 return -EINVAL;
3526 }
3527 mddev->resync_min = min;
3528
3529 return len;
3530 }
3531
3532 static struct md_sysfs_entry md_min_sync =
3533 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3534
3535 static ssize_t
3536 max_sync_show(mddev_t *mddev, char *page)
3537 {
3538 if (mddev->resync_max == MaxSector)
3539 return sprintf(page, "max\n");
3540 else
3541 return sprintf(page, "%llu\n",
3542 (unsigned long long)mddev->resync_max);
3543 }
3544 static ssize_t
3545 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3546 {
3547 if (strncmp(buf, "max", 3) == 0)
3548 mddev->resync_max = MaxSector;
3549 else {
3550 unsigned long long max;
3551 if (strict_strtoull(buf, 10, &max))
3552 return -EINVAL;
3553 if (max < mddev->resync_min)
3554 return -EINVAL;
3555 if (max < mddev->resync_max &&
3556 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3557 return -EBUSY;
3558
3559 /* Must be a multiple of chunk_size */
3560 if (mddev->chunk_size) {
3561 if (max & (sector_t)((mddev->chunk_size>>9)-1))
3562 return -EINVAL;
3563 }
3564 mddev->resync_max = max;
3565 }
3566 wake_up(&mddev->recovery_wait);
3567 return len;
3568 }
3569
3570 static struct md_sysfs_entry md_max_sync =
3571 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3572
3573 static ssize_t
3574 suspend_lo_show(mddev_t *mddev, char *page)
3575 {
3576 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3577 }
3578
3579 static ssize_t
3580 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3581 {
3582 char *e;
3583 unsigned long long new = simple_strtoull(buf, &e, 10);
3584
3585 if (mddev->pers->quiesce == NULL)
3586 return -EINVAL;
3587 if (buf == e || (*e && *e != '\n'))
3588 return -EINVAL;
3589 if (new >= mddev->suspend_hi ||
3590 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3591 mddev->suspend_lo = new;
3592 mddev->pers->quiesce(mddev, 2);
3593 return len;
3594 } else
3595 return -EINVAL;
3596 }
3597 static struct md_sysfs_entry md_suspend_lo =
3598 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3599
3600
3601 static ssize_t
3602 suspend_hi_show(mddev_t *mddev, char *page)
3603 {
3604 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3605 }
3606
3607 static ssize_t
3608 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3609 {
3610 char *e;
3611 unsigned long long new = simple_strtoull(buf, &e, 10);
3612
3613 if (mddev->pers->quiesce == NULL)
3614 return -EINVAL;
3615 if (buf == e || (*e && *e != '\n'))
3616 return -EINVAL;
3617 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3618 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3619 mddev->suspend_hi = new;
3620 mddev->pers->quiesce(mddev, 1);
3621 mddev->pers->quiesce(mddev, 0);
3622 return len;
3623 } else
3624 return -EINVAL;
3625 }
3626 static struct md_sysfs_entry md_suspend_hi =
3627 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3628
3629 static ssize_t
3630 reshape_position_show(mddev_t *mddev, char *page)
3631 {
3632 if (mddev->reshape_position != MaxSector)
3633 return sprintf(page, "%llu\n",
3634 (unsigned long long)mddev->reshape_position);
3635 strcpy(page, "none\n");
3636 return 5;
3637 }
3638
3639 static ssize_t
3640 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3641 {
3642 char *e;
3643 unsigned long long new = simple_strtoull(buf, &e, 10);
3644 if (mddev->pers)
3645 return -EBUSY;
3646 if (buf == e || (*e && *e != '\n'))
3647 return -EINVAL;
3648 mddev->reshape_position = new;
3649 mddev->delta_disks = 0;
3650 mddev->new_level = mddev->level;
3651 mddev->new_layout = mddev->layout;
3652 mddev->new_chunk = mddev->chunk_size;
3653 return len;
3654 }
3655
3656 static struct md_sysfs_entry md_reshape_position =
3657 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3658 reshape_position_store);
3659
3660 static ssize_t
3661 array_size_show(mddev_t *mddev, char *page)
3662 {
3663 if (mddev->external_size)
3664 return sprintf(page, "%llu\n",
3665 (unsigned long long)mddev->array_sectors/2);
3666 else
3667 return sprintf(page, "default\n");
3668 }
3669
3670 static ssize_t
3671 array_size_store(mddev_t *mddev, const char *buf, size_t len)
3672 {
3673 sector_t sectors;
3674
3675 if (strncmp(buf, "default", 7) == 0) {
3676 if (mddev->pers)
3677 sectors = mddev->pers->size(mddev, 0, 0);
3678 else
3679 sectors = mddev->array_sectors;
3680
3681 mddev->external_size = 0;
3682 } else {
3683 if (strict_blocks_to_sectors(buf, &sectors) < 0)
3684 return -EINVAL;
3685 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
3686 return -EINVAL;
3687
3688 mddev->external_size = 1;
3689 }
3690
3691 mddev->array_sectors = sectors;
3692 set_capacity(mddev->gendisk, mddev->array_sectors);
3693 if (mddev->pers) {
3694 struct block_device *bdev = bdget_disk(mddev->gendisk, 0);
3695
3696 if (bdev) {
3697 mutex_lock(&bdev->bd_inode->i_mutex);
3698 i_size_write(bdev->bd_inode,
3699 (loff_t)mddev->array_sectors << 9);
3700 mutex_unlock(&bdev->bd_inode->i_mutex);
3701 bdput(bdev);
3702 }
3703 }
3704
3705 return len;
3706 }
3707
3708 static struct md_sysfs_entry md_array_size =
3709 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
3710 array_size_store);
3711
3712 static struct attribute *md_default_attrs[] = {
3713 &md_level.attr,
3714 &md_layout.attr,
3715 &md_raid_disks.attr,
3716 &md_chunk_size.attr,
3717 &md_size.attr,
3718 &md_resync_start.attr,
3719 &md_metadata.attr,
3720 &md_new_device.attr,
3721 &md_safe_delay.attr,
3722 &md_array_state.attr,
3723 &md_reshape_position.attr,
3724 &md_array_size.attr,
3725 NULL,
3726 };
3727
3728 static struct attribute *md_redundancy_attrs[] = {
3729 &md_scan_mode.attr,
3730 &md_mismatches.attr,
3731 &md_sync_min.attr,
3732 &md_sync_max.attr,
3733 &md_sync_speed.attr,
3734 &md_sync_force_parallel.attr,
3735 &md_sync_completed.attr,
3736 &md_min_sync.attr,
3737 &md_max_sync.attr,
3738 &md_suspend_lo.attr,
3739 &md_suspend_hi.attr,
3740 &md_bitmap.attr,
3741 &md_degraded.attr,
3742 NULL,
3743 };
3744 static struct attribute_group md_redundancy_group = {
3745 .name = NULL,
3746 .attrs = md_redundancy_attrs,
3747 };
3748
3749
3750 static ssize_t
3751 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3752 {
3753 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3754 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3755 ssize_t rv;
3756
3757 if (!entry->show)
3758 return -EIO;
3759 rv = mddev_lock(mddev);
3760 if (!rv) {
3761 rv = entry->show(mddev, page);
3762 mddev_unlock(mddev);
3763 }
3764 return rv;
3765 }
3766
3767 static ssize_t
3768 md_attr_store(struct kobject *kobj, struct attribute *attr,
3769 const char *page, size_t length)
3770 {
3771 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3772 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3773 ssize_t rv;
3774
3775 if (!entry->store)
3776 return -EIO;
3777 if (!capable(CAP_SYS_ADMIN))
3778 return -EACCES;
3779 rv = mddev_lock(mddev);
3780 if (mddev->hold_active == UNTIL_IOCTL)
3781 mddev->hold_active = 0;
3782 if (!rv) {
3783 rv = entry->store(mddev, page, length);
3784 mddev_unlock(mddev);
3785 }
3786 return rv;
3787 }
3788
3789 static void md_free(struct kobject *ko)
3790 {
3791 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3792
3793 if (mddev->sysfs_state)
3794 sysfs_put(mddev->sysfs_state);
3795
3796 if (mddev->gendisk) {
3797 del_gendisk(mddev->gendisk);
3798 put_disk(mddev->gendisk);
3799 }
3800 if (mddev->queue)
3801 blk_cleanup_queue(mddev->queue);
3802
3803 kfree(mddev);
3804 }
3805
3806 static struct sysfs_ops md_sysfs_ops = {
3807 .show = md_attr_show,
3808 .store = md_attr_store,
3809 };
3810 static struct kobj_type md_ktype = {
3811 .release = md_free,
3812 .sysfs_ops = &md_sysfs_ops,
3813 .default_attrs = md_default_attrs,
3814 };
3815
3816 int mdp_major = 0;
3817
3818 static void mddev_delayed_delete(struct work_struct *ws)
3819 {
3820 mddev_t *mddev = container_of(ws, mddev_t, del_work);
3821
3822 if (mddev->private == &md_redundancy_group) {
3823 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3824 if (mddev->sysfs_action)
3825 sysfs_put(mddev->sysfs_action);
3826 mddev->sysfs_action = NULL;
3827 mddev->private = NULL;
3828 }
3829 kobject_del(&mddev->kobj);
3830 kobject_put(&mddev->kobj);
3831 }
3832
3833 static int md_alloc(dev_t dev, char *name)
3834 {
3835 static DEFINE_MUTEX(disks_mutex);
3836 mddev_t *mddev = mddev_find(dev);
3837 struct gendisk *disk;
3838 int partitioned;
3839 int shift;
3840 int unit;
3841 int error;
3842
3843 if (!mddev)
3844 return -ENODEV;
3845
3846 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
3847 shift = partitioned ? MdpMinorShift : 0;
3848 unit = MINOR(mddev->unit) >> shift;
3849
3850 /* wait for any previous instance if this device
3851 * to be completed removed (mddev_delayed_delete).
3852 */
3853 flush_scheduled_work();
3854
3855 mutex_lock(&disks_mutex);
3856 if (mddev->gendisk) {
3857 mutex_unlock(&disks_mutex);
3858 mddev_put(mddev);
3859 return -EEXIST;
3860 }
3861
3862 if (name) {
3863 /* Need to ensure that 'name' is not a duplicate.
3864 */
3865 mddev_t *mddev2;
3866 spin_lock(&all_mddevs_lock);
3867
3868 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
3869 if (mddev2->gendisk &&
3870 strcmp(mddev2->gendisk->disk_name, name) == 0) {
3871 spin_unlock(&all_mddevs_lock);
3872 return -EEXIST;
3873 }
3874 spin_unlock(&all_mddevs_lock);
3875 }
3876
3877 mddev->queue = blk_alloc_queue(GFP_KERNEL);
3878 if (!mddev->queue) {
3879 mutex_unlock(&disks_mutex);
3880 mddev_put(mddev);
3881 return -ENOMEM;
3882 }
3883 mddev->queue->queuedata = mddev;
3884
3885 /* Can be unlocked because the queue is new: no concurrency */
3886 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue);
3887
3888 blk_queue_make_request(mddev->queue, md_make_request);
3889
3890 disk = alloc_disk(1 << shift);
3891 if (!disk) {
3892 mutex_unlock(&disks_mutex);
3893 blk_cleanup_queue(mddev->queue);
3894 mddev->queue = NULL;
3895 mddev_put(mddev);
3896 return -ENOMEM;
3897 }
3898 disk->major = MAJOR(mddev->unit);
3899 disk->first_minor = unit << shift;
3900 if (name)
3901 strcpy(disk->disk_name, name);
3902 else if (partitioned)
3903 sprintf(disk->disk_name, "md_d%d", unit);
3904 else
3905 sprintf(disk->disk_name, "md%d", unit);
3906 disk->fops = &md_fops;
3907 disk->private_data = mddev;
3908 disk->queue = mddev->queue;
3909 /* Allow extended partitions. This makes the
3910 * 'mdp' device redundant, but we can't really
3911 * remove it now.
3912 */
3913 disk->flags |= GENHD_FL_EXT_DEVT;
3914 add_disk(disk);
3915 mddev->gendisk = disk;
3916 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
3917 &disk_to_dev(disk)->kobj, "%s", "md");
3918 mutex_unlock(&disks_mutex);
3919 if (error)
3920 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3921 disk->disk_name);
3922 else {
3923 kobject_uevent(&mddev->kobj, KOBJ_ADD);
3924 mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state");
3925 }
3926 mddev_put(mddev);
3927 return 0;
3928 }
3929
3930 static struct kobject *md_probe(dev_t dev, int *part, void *data)
3931 {
3932 md_alloc(dev, NULL);
3933 return NULL;
3934 }
3935
3936 static int add_named_array(const char *val, struct kernel_param *kp)
3937 {
3938 /* val must be "md_*" where * is not all digits.
3939 * We allocate an array with a large free minor number, and
3940 * set the name to val. val must not already be an active name.
3941 */
3942 int len = strlen(val);
3943 char buf[DISK_NAME_LEN];
3944
3945 while (len && val[len-1] == '\n')
3946 len--;
3947 if (len >= DISK_NAME_LEN)
3948 return -E2BIG;
3949 strlcpy(buf, val, len+1);
3950 if (strncmp(buf, "md_", 3) != 0)
3951 return -EINVAL;
3952 return md_alloc(0, buf);
3953 }
3954
3955 static void md_safemode_timeout(unsigned long data)
3956 {
3957 mddev_t *mddev = (mddev_t *) data;
3958
3959 if (!atomic_read(&mddev->writes_pending)) {
3960 mddev->safemode = 1;
3961 if (mddev->external)
3962 sysfs_notify_dirent(mddev->sysfs_state);
3963 }
3964 md_wakeup_thread(mddev->thread);
3965 }
3966
3967 static int start_dirty_degraded;
3968
3969 static int do_md_run(mddev_t * mddev)
3970 {
3971 int err;
3972 int chunk_size;
3973 mdk_rdev_t *rdev;
3974 struct gendisk *disk;
3975 struct mdk_personality *pers;
3976 char b[BDEVNAME_SIZE];
3977
3978 if (list_empty(&mddev->disks))
3979 /* cannot run an array with no devices.. */
3980 return -EINVAL;
3981
3982 if (mddev->pers)
3983 return -EBUSY;
3984
3985 /*
3986 * Analyze all RAID superblock(s)
3987 */
3988 if (!mddev->raid_disks) {
3989 if (!mddev->persistent)
3990 return -EINVAL;
3991 analyze_sbs(mddev);
3992 }
3993
3994 chunk_size = mddev->chunk_size;
3995
3996 if (chunk_size) {
3997 if (chunk_size > MAX_CHUNK_SIZE) {
3998 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3999 chunk_size, MAX_CHUNK_SIZE);
4000 return -EINVAL;
4001 }
4002 /*
4003 * chunk-size has to be a power of 2
4004 */
4005 if ( (1 << ffz(~chunk_size)) != chunk_size) {
4006 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
4007 return -EINVAL;
4008 }
4009
4010 /* devices must have minimum size of one chunk */
4011 list_for_each_entry(rdev, &mddev->disks, same_set) {
4012 if (test_bit(Faulty, &rdev->flags))
4013 continue;
4014 if (rdev->sectors < chunk_size / 512) {
4015 printk(KERN_WARNING
4016 "md: Dev %s smaller than chunk_size:"
4017 " %llu < %d\n",
4018 bdevname(rdev->bdev,b),
4019 (unsigned long long)rdev->sectors,
4020 chunk_size / 512);
4021 return -EINVAL;
4022 }
4023 }
4024 }
4025
4026 if (mddev->level != LEVEL_NONE)
4027 request_module("md-level-%d", mddev->level);
4028 else if (mddev->clevel[0])
4029 request_module("md-%s", mddev->clevel);
4030
4031 /*
4032 * Drop all container device buffers, from now on
4033 * the only valid external interface is through the md
4034 * device.
4035 */
4036 list_for_each_entry(rdev, &mddev->disks, same_set) {
4037 if (test_bit(Faulty, &rdev->flags))
4038 continue;
4039 sync_blockdev(rdev->bdev);
4040 invalidate_bdev(rdev->bdev);
4041
4042 /* perform some consistency tests on the device.
4043 * We don't want the data to overlap the metadata,
4044 * Internal Bitmap issues have been handled elsewhere.
4045 */
4046 if (rdev->data_offset < rdev->sb_start) {
4047 if (mddev->dev_sectors &&
4048 rdev->data_offset + mddev->dev_sectors
4049 > rdev->sb_start) {
4050 printk("md: %s: data overlaps metadata\n",
4051 mdname(mddev));
4052 return -EINVAL;
4053 }
4054 } else {
4055 if (rdev->sb_start + rdev->sb_size/512
4056 > rdev->data_offset) {
4057 printk("md: %s: metadata overlaps data\n",
4058 mdname(mddev));
4059 return -EINVAL;
4060 }
4061 }
4062 sysfs_notify_dirent(rdev->sysfs_state);
4063 }
4064
4065 md_probe(mddev->unit, NULL, NULL);
4066 disk = mddev->gendisk;
4067 if (!disk)
4068 return -ENOMEM;
4069
4070 spin_lock(&pers_lock);
4071 pers = find_pers(mddev->level, mddev->clevel);
4072 if (!pers || !try_module_get(pers->owner)) {
4073 spin_unlock(&pers_lock);
4074 if (mddev->level != LEVEL_NONE)
4075 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4076 mddev->level);
4077 else
4078 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4079 mddev->clevel);
4080 return -EINVAL;
4081 }
4082 mddev->pers = pers;
4083 spin_unlock(&pers_lock);
4084 if (mddev->level != pers->level) {
4085 mddev->level = pers->level;
4086 mddev->new_level = pers->level;
4087 }
4088 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4089
4090 if (pers->level >= 4 && pers->level <= 6)
4091 /* Cannot support integrity (yet) */
4092 blk_integrity_unregister(mddev->gendisk);
4093
4094 if (mddev->reshape_position != MaxSector &&
4095 pers->start_reshape == NULL) {
4096 /* This personality cannot handle reshaping... */
4097 mddev->pers = NULL;
4098 module_put(pers->owner);
4099 return -EINVAL;
4100 }
4101
4102 if (pers->sync_request) {
4103 /* Warn if this is a potentially silly
4104 * configuration.
4105 */
4106 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4107 mdk_rdev_t *rdev2;
4108 int warned = 0;
4109
4110 list_for_each_entry(rdev, &mddev->disks, same_set)
4111 list_for_each_entry(rdev2, &mddev->disks, same_set) {
4112 if (rdev < rdev2 &&
4113 rdev->bdev->bd_contains ==
4114 rdev2->bdev->bd_contains) {
4115 printk(KERN_WARNING
4116 "%s: WARNING: %s appears to be"
4117 " on the same physical disk as"
4118 " %s.\n",
4119 mdname(mddev),
4120 bdevname(rdev->bdev,b),
4121 bdevname(rdev2->bdev,b2));
4122 warned = 1;
4123 }
4124 }
4125
4126 if (warned)
4127 printk(KERN_WARNING
4128 "True protection against single-disk"
4129 " failure might be compromised.\n");
4130 }
4131
4132 mddev->recovery = 0;
4133 /* may be over-ridden by personality */
4134 mddev->resync_max_sectors = mddev->dev_sectors;
4135
4136 mddev->barriers_work = 1;
4137 mddev->ok_start_degraded = start_dirty_degraded;
4138
4139 if (start_readonly)
4140 mddev->ro = 2; /* read-only, but switch on first write */
4141
4142 err = mddev->pers->run(mddev);
4143 if (err)
4144 printk(KERN_ERR "md: pers->run() failed ...\n");
4145 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4146 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4147 " but 'external_size' not in effect?\n", __func__);
4148 printk(KERN_ERR
4149 "md: invalid array_size %llu > default size %llu\n",
4150 (unsigned long long)mddev->array_sectors / 2,
4151 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4152 err = -EINVAL;
4153 mddev->pers->stop(mddev);
4154 }
4155 if (err == 0 && mddev->pers->sync_request) {
4156 err = bitmap_create(mddev);
4157 if (err) {
4158 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4159 mdname(mddev), err);
4160 mddev->pers->stop(mddev);
4161 }
4162 }
4163 if (err) {
4164 module_put(mddev->pers->owner);
4165 mddev->pers = NULL;
4166 bitmap_destroy(mddev);
4167 return err;
4168 }
4169 if (mddev->pers->sync_request) {
4170 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4171 printk(KERN_WARNING
4172 "md: cannot register extra attributes for %s\n",
4173 mdname(mddev));
4174 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4175 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4176 mddev->ro = 0;
4177
4178 atomic_set(&mddev->writes_pending,0);
4179 mddev->safemode = 0;
4180 mddev->safemode_timer.function = md_safemode_timeout;
4181 mddev->safemode_timer.data = (unsigned long) mddev;
4182 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4183 mddev->in_sync = 1;
4184
4185 list_for_each_entry(rdev, &mddev->disks, same_set)
4186 if (rdev->raid_disk >= 0) {
4187 char nm[20];
4188 sprintf(nm, "rd%d", rdev->raid_disk);
4189 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
4190 printk("md: cannot register %s for %s\n",
4191 nm, mdname(mddev));
4192 }
4193
4194 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4195
4196 if (mddev->flags)
4197 md_update_sb(mddev, 0);
4198
4199 set_capacity(disk, mddev->array_sectors);
4200
4201 /* If there is a partially-recovered drive we need to
4202 * start recovery here. If we leave it to md_check_recovery,
4203 * it will remove the drives and not do the right thing
4204 */
4205 if (mddev->degraded && !mddev->sync_thread) {
4206 int spares = 0;
4207 list_for_each_entry(rdev, &mddev->disks, same_set)
4208 if (rdev->raid_disk >= 0 &&
4209 !test_bit(In_sync, &rdev->flags) &&
4210 !test_bit(Faulty, &rdev->flags))
4211 /* complete an interrupted recovery */
4212 spares++;
4213 if (spares && mddev->pers->sync_request) {
4214 mddev->recovery = 0;
4215 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
4216 mddev->sync_thread = md_register_thread(md_do_sync,
4217 mddev,
4218 "%s_resync");
4219 if (!mddev->sync_thread) {
4220 printk(KERN_ERR "%s: could not start resync"
4221 " thread...\n",
4222 mdname(mddev));
4223 /* leave the spares where they are, it shouldn't hurt */
4224 mddev->recovery = 0;
4225 }
4226 }
4227 }
4228 md_wakeup_thread(mddev->thread);
4229 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4230
4231 mddev->changed = 1;
4232 md_new_event(mddev);
4233 sysfs_notify_dirent(mddev->sysfs_state);
4234 if (mddev->sysfs_action)
4235 sysfs_notify_dirent(mddev->sysfs_action);
4236 sysfs_notify(&mddev->kobj, NULL, "degraded");
4237 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4238 return 0;
4239 }
4240
4241 static int restart_array(mddev_t *mddev)
4242 {
4243 struct gendisk *disk = mddev->gendisk;
4244
4245 /* Complain if it has no devices */
4246 if (list_empty(&mddev->disks))
4247 return -ENXIO;
4248 if (!mddev->pers)
4249 return -EINVAL;
4250 if (!mddev->ro)
4251 return -EBUSY;
4252 mddev->safemode = 0;
4253 mddev->ro = 0;
4254 set_disk_ro(disk, 0);
4255 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4256 mdname(mddev));
4257 /* Kick recovery or resync if necessary */
4258 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4259 md_wakeup_thread(mddev->thread);
4260 md_wakeup_thread(mddev->sync_thread);
4261 sysfs_notify_dirent(mddev->sysfs_state);
4262 return 0;
4263 }
4264
4265 /* similar to deny_write_access, but accounts for our holding a reference
4266 * to the file ourselves */
4267 static int deny_bitmap_write_access(struct file * file)
4268 {
4269 struct inode *inode = file->f_mapping->host;
4270
4271 spin_lock(&inode->i_lock);
4272 if (atomic_read(&inode->i_writecount) > 1) {
4273 spin_unlock(&inode->i_lock);
4274 return -ETXTBSY;
4275 }
4276 atomic_set(&inode->i_writecount, -1);
4277 spin_unlock(&inode->i_lock);
4278
4279 return 0;
4280 }
4281
4282 static void restore_bitmap_write_access(struct file *file)
4283 {
4284 struct inode *inode = file->f_mapping->host;
4285
4286 spin_lock(&inode->i_lock);
4287 atomic_set(&inode->i_writecount, 1);
4288 spin_unlock(&inode->i_lock);
4289 }
4290
4291 /* mode:
4292 * 0 - completely stop and dis-assemble array
4293 * 1 - switch to readonly
4294 * 2 - stop but do not disassemble array
4295 */
4296 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4297 {
4298 int err = 0;
4299 struct gendisk *disk = mddev->gendisk;
4300
4301 if (atomic_read(&mddev->openers) > is_open) {
4302 printk("md: %s still in use.\n",mdname(mddev));
4303 return -EBUSY;
4304 }
4305
4306 if (mddev->pers) {
4307
4308 if (mddev->sync_thread) {
4309 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4310 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4311 md_unregister_thread(mddev->sync_thread);
4312 mddev->sync_thread = NULL;
4313 }
4314
4315 del_timer_sync(&mddev->safemode_timer);
4316
4317 switch(mode) {
4318 case 1: /* readonly */
4319 err = -ENXIO;
4320 if (mddev->ro==1)
4321 goto out;
4322 mddev->ro = 1;
4323 break;
4324 case 0: /* disassemble */
4325 case 2: /* stop */
4326 bitmap_flush(mddev);
4327 md_super_wait(mddev);
4328 if (mddev->ro)
4329 set_disk_ro(disk, 0);
4330
4331 mddev->pers->stop(mddev);
4332 mddev->queue->merge_bvec_fn = NULL;
4333 mddev->queue->unplug_fn = NULL;
4334 mddev->queue->backing_dev_info.congested_fn = NULL;
4335 module_put(mddev->pers->owner);
4336 if (mddev->pers->sync_request)
4337 mddev->private = &md_redundancy_group;
4338 mddev->pers = NULL;
4339 /* tell userspace to handle 'inactive' */
4340 sysfs_notify_dirent(mddev->sysfs_state);
4341
4342 set_capacity(disk, 0);
4343 mddev->changed = 1;
4344
4345 if (mddev->ro)
4346 mddev->ro = 0;
4347 }
4348 if (!mddev->in_sync || mddev->flags) {
4349 /* mark array as shutdown cleanly */
4350 mddev->in_sync = 1;
4351 md_update_sb(mddev, 1);
4352 }
4353 if (mode == 1)
4354 set_disk_ro(disk, 1);
4355 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4356 }
4357
4358 /*
4359 * Free resources if final stop
4360 */
4361 if (mode == 0) {
4362 mdk_rdev_t *rdev;
4363
4364 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4365
4366 bitmap_destroy(mddev);
4367 if (mddev->bitmap_file) {
4368 restore_bitmap_write_access(mddev->bitmap_file);
4369 fput(mddev->bitmap_file);
4370 mddev->bitmap_file = NULL;
4371 }
4372 mddev->bitmap_offset = 0;
4373
4374 list_for_each_entry(rdev, &mddev->disks, same_set)
4375 if (rdev->raid_disk >= 0) {
4376 char nm[20];
4377 sprintf(nm, "rd%d", rdev->raid_disk);
4378 sysfs_remove_link(&mddev->kobj, nm);
4379 }
4380
4381 /* make sure all md_delayed_delete calls have finished */
4382 flush_scheduled_work();
4383
4384 export_array(mddev);
4385
4386 mddev->array_sectors = 0;
4387 mddev->external_size = 0;
4388 mddev->dev_sectors = 0;
4389 mddev->raid_disks = 0;
4390 mddev->recovery_cp = 0;
4391 mddev->resync_min = 0;
4392 mddev->resync_max = MaxSector;
4393 mddev->reshape_position = MaxSector;
4394 mddev->external = 0;
4395 mddev->persistent = 0;
4396 mddev->level = LEVEL_NONE;
4397 mddev->clevel[0] = 0;
4398 mddev->flags = 0;
4399 mddev->ro = 0;
4400 mddev->metadata_type[0] = 0;
4401 mddev->chunk_size = 0;
4402 mddev->ctime = mddev->utime = 0;
4403 mddev->layout = 0;
4404 mddev->max_disks = 0;
4405 mddev->events = 0;
4406 mddev->delta_disks = 0;
4407 mddev->new_level = LEVEL_NONE;
4408 mddev->new_layout = 0;
4409 mddev->new_chunk = 0;
4410 mddev->curr_resync = 0;
4411 mddev->resync_mismatches = 0;
4412 mddev->suspend_lo = mddev->suspend_hi = 0;
4413 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4414 mddev->recovery = 0;
4415 mddev->in_sync = 0;
4416 mddev->changed = 0;
4417 mddev->degraded = 0;
4418 mddev->barriers_work = 0;
4419 mddev->safemode = 0;
4420 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4421 if (mddev->hold_active == UNTIL_STOP)
4422 mddev->hold_active = 0;
4423
4424 } else if (mddev->pers)
4425 printk(KERN_INFO "md: %s switched to read-only mode.\n",
4426 mdname(mddev));
4427 err = 0;
4428 blk_integrity_unregister(disk);
4429 md_new_event(mddev);
4430 sysfs_notify_dirent(mddev->sysfs_state);
4431 out:
4432 return err;
4433 }
4434
4435 #ifndef MODULE
4436 static void autorun_array(mddev_t *mddev)
4437 {
4438 mdk_rdev_t *rdev;
4439 int err;
4440
4441 if (list_empty(&mddev->disks))
4442 return;
4443
4444 printk(KERN_INFO "md: running: ");
4445
4446 list_for_each_entry(rdev, &mddev->disks, same_set) {
4447 char b[BDEVNAME_SIZE];
4448 printk("<%s>", bdevname(rdev->bdev,b));
4449 }
4450 printk("\n");
4451
4452 err = do_md_run(mddev);
4453 if (err) {
4454 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4455 do_md_stop(mddev, 0, 0);
4456 }
4457 }
4458
4459 /*
4460 * lets try to run arrays based on all disks that have arrived
4461 * until now. (those are in pending_raid_disks)
4462 *
4463 * the method: pick the first pending disk, collect all disks with
4464 * the same UUID, remove all from the pending list and put them into
4465 * the 'same_array' list. Then order this list based on superblock
4466 * update time (freshest comes first), kick out 'old' disks and
4467 * compare superblocks. If everything's fine then run it.
4468 *
4469 * If "unit" is allocated, then bump its reference count
4470 */
4471 static void autorun_devices(int part)
4472 {
4473 mdk_rdev_t *rdev0, *rdev, *tmp;
4474 mddev_t *mddev;
4475 char b[BDEVNAME_SIZE];
4476
4477 printk(KERN_INFO "md: autorun ...\n");
4478 while (!list_empty(&pending_raid_disks)) {
4479 int unit;
4480 dev_t dev;
4481 LIST_HEAD(candidates);
4482 rdev0 = list_entry(pending_raid_disks.next,
4483 mdk_rdev_t, same_set);
4484
4485 printk(KERN_INFO "md: considering %s ...\n",
4486 bdevname(rdev0->bdev,b));
4487 INIT_LIST_HEAD(&candidates);
4488 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4489 if (super_90_load(rdev, rdev0, 0) >= 0) {
4490 printk(KERN_INFO "md: adding %s ...\n",
4491 bdevname(rdev->bdev,b));
4492 list_move(&rdev->same_set, &candidates);
4493 }
4494 /*
4495 * now we have a set of devices, with all of them having
4496 * mostly sane superblocks. It's time to allocate the
4497 * mddev.
4498 */
4499 if (part) {
4500 dev = MKDEV(mdp_major,
4501 rdev0->preferred_minor << MdpMinorShift);
4502 unit = MINOR(dev) >> MdpMinorShift;
4503 } else {
4504 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4505 unit = MINOR(dev);
4506 }
4507 if (rdev0->preferred_minor != unit) {
4508 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4509 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4510 break;
4511 }
4512
4513 md_probe(dev, NULL, NULL);
4514 mddev = mddev_find(dev);
4515 if (!mddev || !mddev->gendisk) {
4516 if (mddev)
4517 mddev_put(mddev);
4518 printk(KERN_ERR
4519 "md: cannot allocate memory for md drive.\n");
4520 break;
4521 }
4522 if (mddev_lock(mddev))
4523 printk(KERN_WARNING "md: %s locked, cannot run\n",
4524 mdname(mddev));
4525 else if (mddev->raid_disks || mddev->major_version
4526 || !list_empty(&mddev->disks)) {
4527 printk(KERN_WARNING
4528 "md: %s already running, cannot run %s\n",
4529 mdname(mddev), bdevname(rdev0->bdev,b));
4530 mddev_unlock(mddev);
4531 } else {
4532 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4533 mddev->persistent = 1;
4534 rdev_for_each_list(rdev, tmp, &candidates) {
4535 list_del_init(&rdev->same_set);
4536 if (bind_rdev_to_array(rdev, mddev))
4537 export_rdev(rdev);
4538 }
4539 autorun_array(mddev);
4540 mddev_unlock(mddev);
4541 }
4542 /* on success, candidates will be empty, on error
4543 * it won't...
4544 */
4545 rdev_for_each_list(rdev, tmp, &candidates) {
4546 list_del_init(&rdev->same_set);
4547 export_rdev(rdev);
4548 }
4549 mddev_put(mddev);
4550 }
4551 printk(KERN_INFO "md: ... autorun DONE.\n");
4552 }
4553 #endif /* !MODULE */
4554
4555 static int get_version(void __user * arg)
4556 {
4557 mdu_version_t ver;
4558
4559 ver.major = MD_MAJOR_VERSION;
4560 ver.minor = MD_MINOR_VERSION;
4561 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4562
4563 if (copy_to_user(arg, &ver, sizeof(ver)))
4564 return -EFAULT;
4565
4566 return 0;
4567 }
4568
4569 static int get_array_info(mddev_t * mddev, void __user * arg)
4570 {
4571 mdu_array_info_t info;
4572 int nr,working,active,failed,spare;
4573 mdk_rdev_t *rdev;
4574
4575 nr=working=active=failed=spare=0;
4576 list_for_each_entry(rdev, &mddev->disks, same_set) {
4577 nr++;
4578 if (test_bit(Faulty, &rdev->flags))
4579 failed++;
4580 else {
4581 working++;
4582 if (test_bit(In_sync, &rdev->flags))
4583 active++;
4584 else
4585 spare++;
4586 }
4587 }
4588
4589 info.major_version = mddev->major_version;
4590 info.minor_version = mddev->minor_version;
4591 info.patch_version = MD_PATCHLEVEL_VERSION;
4592 info.ctime = mddev->ctime;
4593 info.level = mddev->level;
4594 info.size = mddev->dev_sectors / 2;
4595 if (info.size != mddev->dev_sectors / 2) /* overflow */
4596 info.size = -1;
4597 info.nr_disks = nr;
4598 info.raid_disks = mddev->raid_disks;
4599 info.md_minor = mddev->md_minor;
4600 info.not_persistent= !mddev->persistent;
4601
4602 info.utime = mddev->utime;
4603 info.state = 0;
4604 if (mddev->in_sync)
4605 info.state = (1<<MD_SB_CLEAN);
4606 if (mddev->bitmap && mddev->bitmap_offset)
4607 info.state = (1<<MD_SB_BITMAP_PRESENT);
4608 info.active_disks = active;
4609 info.working_disks = working;
4610 info.failed_disks = failed;
4611 info.spare_disks = spare;
4612
4613 info.layout = mddev->layout;
4614 info.chunk_size = mddev->chunk_size;
4615
4616 if (copy_to_user(arg, &info, sizeof(info)))
4617 return -EFAULT;
4618
4619 return 0;
4620 }
4621
4622 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4623 {
4624 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4625 char *ptr, *buf = NULL;
4626 int err = -ENOMEM;
4627
4628 if (md_allow_write(mddev))
4629 file = kmalloc(sizeof(*file), GFP_NOIO);
4630 else
4631 file = kmalloc(sizeof(*file), GFP_KERNEL);
4632
4633 if (!file)
4634 goto out;
4635
4636 /* bitmap disabled, zero the first byte and copy out */
4637 if (!mddev->bitmap || !mddev->bitmap->file) {
4638 file->pathname[0] = '\0';
4639 goto copy_out;
4640 }
4641
4642 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4643 if (!buf)
4644 goto out;
4645
4646 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4647 if (IS_ERR(ptr))
4648 goto out;
4649
4650 strcpy(file->pathname, ptr);
4651
4652 copy_out:
4653 err = 0;
4654 if (copy_to_user(arg, file, sizeof(*file)))
4655 err = -EFAULT;
4656 out:
4657 kfree(buf);
4658 kfree(file);
4659 return err;
4660 }
4661
4662 static int get_disk_info(mddev_t * mddev, void __user * arg)
4663 {
4664 mdu_disk_info_t info;
4665 mdk_rdev_t *rdev;
4666
4667 if (copy_from_user(&info, arg, sizeof(info)))
4668 return -EFAULT;
4669
4670 rdev = find_rdev_nr(mddev, info.number);
4671 if (rdev) {
4672 info.major = MAJOR(rdev->bdev->bd_dev);
4673 info.minor = MINOR(rdev->bdev->bd_dev);
4674 info.raid_disk = rdev->raid_disk;
4675 info.state = 0;
4676 if (test_bit(Faulty, &rdev->flags))
4677 info.state |= (1<<MD_DISK_FAULTY);
4678 else if (test_bit(In_sync, &rdev->flags)) {
4679 info.state |= (1<<MD_DISK_ACTIVE);
4680 info.state |= (1<<MD_DISK_SYNC);
4681 }
4682 if (test_bit(WriteMostly, &rdev->flags))
4683 info.state |= (1<<MD_DISK_WRITEMOSTLY);
4684 } else {
4685 info.major = info.minor = 0;
4686 info.raid_disk = -1;
4687 info.state = (1<<MD_DISK_REMOVED);
4688 }
4689
4690 if (copy_to_user(arg, &info, sizeof(info)))
4691 return -EFAULT;
4692
4693 return 0;
4694 }
4695
4696 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4697 {
4698 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4699 mdk_rdev_t *rdev;
4700 dev_t dev = MKDEV(info->major,info->minor);
4701
4702 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4703 return -EOVERFLOW;
4704
4705 if (!mddev->raid_disks) {
4706 int err;
4707 /* expecting a device which has a superblock */
4708 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4709 if (IS_ERR(rdev)) {
4710 printk(KERN_WARNING
4711 "md: md_import_device returned %ld\n",
4712 PTR_ERR(rdev));
4713 return PTR_ERR(rdev);
4714 }
4715 if (!list_empty(&mddev->disks)) {
4716 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4717 mdk_rdev_t, same_set);
4718 int err = super_types[mddev->major_version]
4719 .load_super(rdev, rdev0, mddev->minor_version);
4720 if (err < 0) {
4721 printk(KERN_WARNING
4722 "md: %s has different UUID to %s\n",
4723 bdevname(rdev->bdev,b),
4724 bdevname(rdev0->bdev,b2));
4725 export_rdev(rdev);
4726 return -EINVAL;
4727 }
4728 }
4729 err = bind_rdev_to_array(rdev, mddev);
4730 if (err)
4731 export_rdev(rdev);
4732 return err;
4733 }
4734
4735 /*
4736 * add_new_disk can be used once the array is assembled
4737 * to add "hot spares". They must already have a superblock
4738 * written
4739 */
4740 if (mddev->pers) {
4741 int err;
4742 if (!mddev->pers->hot_add_disk) {
4743 printk(KERN_WARNING
4744 "%s: personality does not support diskops!\n",
4745 mdname(mddev));
4746 return -EINVAL;
4747 }
4748 if (mddev->persistent)
4749 rdev = md_import_device(dev, mddev->major_version,
4750 mddev->minor_version);
4751 else
4752 rdev = md_import_device(dev, -1, -1);
4753 if (IS_ERR(rdev)) {
4754 printk(KERN_WARNING
4755 "md: md_import_device returned %ld\n",
4756 PTR_ERR(rdev));
4757 return PTR_ERR(rdev);
4758 }
4759 /* set save_raid_disk if appropriate */
4760 if (!mddev->persistent) {
4761 if (info->state & (1<<MD_DISK_SYNC) &&
4762 info->raid_disk < mddev->raid_disks)
4763 rdev->raid_disk = info->raid_disk;
4764 else
4765 rdev->raid_disk = -1;
4766 } else
4767 super_types[mddev->major_version].
4768 validate_super(mddev, rdev);
4769 rdev->saved_raid_disk = rdev->raid_disk;
4770
4771 clear_bit(In_sync, &rdev->flags); /* just to be sure */
4772 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4773 set_bit(WriteMostly, &rdev->flags);
4774 else
4775 clear_bit(WriteMostly, &rdev->flags);
4776
4777 rdev->raid_disk = -1;
4778 err = bind_rdev_to_array(rdev, mddev);
4779 if (!err && !mddev->pers->hot_remove_disk) {
4780 /* If there is hot_add_disk but no hot_remove_disk
4781 * then added disks for geometry changes,
4782 * and should be added immediately.
4783 */
4784 super_types[mddev->major_version].
4785 validate_super(mddev, rdev);
4786 err = mddev->pers->hot_add_disk(mddev, rdev);
4787 if (err)
4788 unbind_rdev_from_array(rdev);
4789 }
4790 if (err)
4791 export_rdev(rdev);
4792 else
4793 sysfs_notify_dirent(rdev->sysfs_state);
4794
4795 md_update_sb(mddev, 1);
4796 if (mddev->degraded)
4797 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4798 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4799 md_wakeup_thread(mddev->thread);
4800 return err;
4801 }
4802
4803 /* otherwise, add_new_disk is only allowed
4804 * for major_version==0 superblocks
4805 */
4806 if (mddev->major_version != 0) {
4807 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4808 mdname(mddev));
4809 return -EINVAL;
4810 }
4811
4812 if (!(info->state & (1<<MD_DISK_FAULTY))) {
4813 int err;
4814 rdev = md_import_device(dev, -1, 0);
4815 if (IS_ERR(rdev)) {
4816 printk(KERN_WARNING
4817 "md: error, md_import_device() returned %ld\n",
4818 PTR_ERR(rdev));
4819 return PTR_ERR(rdev);
4820 }
4821 rdev->desc_nr = info->number;
4822 if (info->raid_disk < mddev->raid_disks)
4823 rdev->raid_disk = info->raid_disk;
4824 else
4825 rdev->raid_disk = -1;
4826
4827 if (rdev->raid_disk < mddev->raid_disks)
4828 if (info->state & (1<<MD_DISK_SYNC))
4829 set_bit(In_sync, &rdev->flags);
4830
4831 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4832 set_bit(WriteMostly, &rdev->flags);
4833
4834 if (!mddev->persistent) {
4835 printk(KERN_INFO "md: nonpersistent superblock ...\n");
4836 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4837 } else
4838 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4839 rdev->sectors = calc_num_sectors(rdev, mddev->chunk_size);
4840
4841 err = bind_rdev_to_array(rdev, mddev);
4842 if (err) {
4843 export_rdev(rdev);
4844 return err;
4845 }
4846 }
4847
4848 return 0;
4849 }
4850
4851 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4852 {
4853 char b[BDEVNAME_SIZE];
4854 mdk_rdev_t *rdev;
4855
4856 rdev = find_rdev(mddev, dev);
4857 if (!rdev)
4858 return -ENXIO;
4859
4860 if (rdev->raid_disk >= 0)
4861 goto busy;
4862
4863 kick_rdev_from_array(rdev);
4864 md_update_sb(mddev, 1);
4865 md_new_event(mddev);
4866
4867 return 0;
4868 busy:
4869 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
4870 bdevname(rdev->bdev,b), mdname(mddev));
4871 return -EBUSY;
4872 }
4873
4874 static int hot_add_disk(mddev_t * mddev, dev_t dev)
4875 {
4876 char b[BDEVNAME_SIZE];
4877 int err;
4878 mdk_rdev_t *rdev;
4879
4880 if (!mddev->pers)
4881 return -ENODEV;
4882
4883 if (mddev->major_version != 0) {
4884 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4885 " version-0 superblocks.\n",
4886 mdname(mddev));
4887 return -EINVAL;
4888 }
4889 if (!mddev->pers->hot_add_disk) {
4890 printk(KERN_WARNING
4891 "%s: personality does not support diskops!\n",
4892 mdname(mddev));
4893 return -EINVAL;
4894 }
4895
4896 rdev = md_import_device(dev, -1, 0);
4897 if (IS_ERR(rdev)) {
4898 printk(KERN_WARNING
4899 "md: error, md_import_device() returned %ld\n",
4900 PTR_ERR(rdev));
4901 return -EINVAL;
4902 }
4903
4904 if (mddev->persistent)
4905 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4906 else
4907 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4908
4909 rdev->sectors = calc_num_sectors(rdev, mddev->chunk_size);
4910
4911 if (test_bit(Faulty, &rdev->flags)) {
4912 printk(KERN_WARNING
4913 "md: can not hot-add faulty %s disk to %s!\n",
4914 bdevname(rdev->bdev,b), mdname(mddev));
4915 err = -EINVAL;
4916 goto abort_export;
4917 }
4918 clear_bit(In_sync, &rdev->flags);
4919 rdev->desc_nr = -1;
4920 rdev->saved_raid_disk = -1;
4921 err = bind_rdev_to_array(rdev, mddev);
4922 if (err)
4923 goto abort_export;
4924
4925 /*
4926 * The rest should better be atomic, we can have disk failures
4927 * noticed in interrupt contexts ...
4928 */
4929
4930 rdev->raid_disk = -1;
4931
4932 md_update_sb(mddev, 1);
4933
4934 /*
4935 * Kick recovery, maybe this spare has to be added to the
4936 * array immediately.
4937 */
4938 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4939 md_wakeup_thread(mddev->thread);
4940 md_new_event(mddev);
4941 return 0;
4942
4943 abort_export:
4944 export_rdev(rdev);
4945 return err;
4946 }
4947
4948 static int set_bitmap_file(mddev_t *mddev, int fd)
4949 {
4950 int err;
4951
4952 if (mddev->pers) {
4953 if (!mddev->pers->quiesce)
4954 return -EBUSY;
4955 if (mddev->recovery || mddev->sync_thread)
4956 return -EBUSY;
4957 /* we should be able to change the bitmap.. */
4958 }
4959
4960
4961 if (fd >= 0) {
4962 if (mddev->bitmap)
4963 return -EEXIST; /* cannot add when bitmap is present */
4964 mddev->bitmap_file = fget(fd);
4965
4966 if (mddev->bitmap_file == NULL) {
4967 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4968 mdname(mddev));
4969 return -EBADF;
4970 }
4971
4972 err = deny_bitmap_write_access(mddev->bitmap_file);
4973 if (err) {
4974 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4975 mdname(mddev));
4976 fput(mddev->bitmap_file);
4977 mddev->bitmap_file = NULL;
4978 return err;
4979 }
4980 mddev->bitmap_offset = 0; /* file overrides offset */
4981 } else if (mddev->bitmap == NULL)
4982 return -ENOENT; /* cannot remove what isn't there */
4983 err = 0;
4984 if (mddev->pers) {
4985 mddev->pers->quiesce(mddev, 1);
4986 if (fd >= 0)
4987 err = bitmap_create(mddev);
4988 if (fd < 0 || err) {
4989 bitmap_destroy(mddev);
4990 fd = -1; /* make sure to put the file */
4991 }
4992 mddev->pers->quiesce(mddev, 0);
4993 }
4994 if (fd < 0) {
4995 if (mddev->bitmap_file) {
4996 restore_bitmap_write_access(mddev->bitmap_file);
4997 fput(mddev->bitmap_file);
4998 }
4999 mddev->bitmap_file = NULL;
5000 }
5001
5002 return err;
5003 }
5004
5005 /*
5006 * set_array_info is used two different ways
5007 * The original usage is when creating a new array.
5008 * In this usage, raid_disks is > 0 and it together with
5009 * level, size, not_persistent,layout,chunksize determine the
5010 * shape of the array.
5011 * This will always create an array with a type-0.90.0 superblock.
5012 * The newer usage is when assembling an array.
5013 * In this case raid_disks will be 0, and the major_version field is
5014 * use to determine which style super-blocks are to be found on the devices.
5015 * The minor and patch _version numbers are also kept incase the
5016 * super_block handler wishes to interpret them.
5017 */
5018 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5019 {
5020
5021 if (info->raid_disks == 0) {
5022 /* just setting version number for superblock loading */
5023 if (info->major_version < 0 ||
5024 info->major_version >= ARRAY_SIZE(super_types) ||
5025 super_types[info->major_version].name == NULL) {
5026 /* maybe try to auto-load a module? */
5027 printk(KERN_INFO
5028 "md: superblock version %d not known\n",
5029 info->major_version);
5030 return -EINVAL;
5031 }
5032 mddev->major_version = info->major_version;
5033 mddev->minor_version = info->minor_version;
5034 mddev->patch_version = info->patch_version;
5035 mddev->persistent = !info->not_persistent;
5036 return 0;
5037 }
5038 mddev->major_version = MD_MAJOR_VERSION;
5039 mddev->minor_version = MD_MINOR_VERSION;
5040 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5041 mddev->ctime = get_seconds();
5042
5043 mddev->level = info->level;
5044 mddev->clevel[0] = 0;
5045 mddev->dev_sectors = 2 * (sector_t)info->size;
5046 mddev->raid_disks = info->raid_disks;
5047 /* don't set md_minor, it is determined by which /dev/md* was
5048 * openned
5049 */
5050 if (info->state & (1<<MD_SB_CLEAN))
5051 mddev->recovery_cp = MaxSector;
5052 else
5053 mddev->recovery_cp = 0;
5054 mddev->persistent = ! info->not_persistent;
5055 mddev->external = 0;
5056
5057 mddev->layout = info->layout;
5058 mddev->chunk_size = info->chunk_size;
5059
5060 mddev->max_disks = MD_SB_DISKS;
5061
5062 if (mddev->persistent)
5063 mddev->flags = 0;
5064 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5065
5066 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
5067 mddev->bitmap_offset = 0;
5068
5069 mddev->reshape_position = MaxSector;
5070
5071 /*
5072 * Generate a 128 bit UUID
5073 */
5074 get_random_bytes(mddev->uuid, 16);
5075
5076 mddev->new_level = mddev->level;
5077 mddev->new_chunk = mddev->chunk_size;
5078 mddev->new_layout = mddev->layout;
5079 mddev->delta_disks = 0;
5080
5081 return 0;
5082 }
5083
5084 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5085 {
5086 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5087
5088 if (mddev->external_size)
5089 return;
5090
5091 mddev->array_sectors = array_sectors;
5092 }
5093 EXPORT_SYMBOL(md_set_array_sectors);
5094
5095 static int update_size(mddev_t *mddev, sector_t num_sectors)
5096 {
5097 mdk_rdev_t *rdev;
5098 int rv;
5099 int fit = (num_sectors == 0);
5100
5101 if (mddev->pers->resize == NULL)
5102 return -EINVAL;
5103 /* The "num_sectors" is the number of sectors of each device that
5104 * is used. This can only make sense for arrays with redundancy.
5105 * linear and raid0 always use whatever space is available. We can only
5106 * consider changing this number if no resync or reconstruction is
5107 * happening, and if the new size is acceptable. It must fit before the
5108 * sb_start or, if that is <data_offset, it must fit before the size
5109 * of each device. If num_sectors is zero, we find the largest size
5110 * that fits.
5111
5112 */
5113 if (mddev->sync_thread)
5114 return -EBUSY;
5115 if (mddev->bitmap)
5116 /* Sorry, cannot grow a bitmap yet, just remove it,
5117 * grow, and re-add.
5118 */
5119 return -EBUSY;
5120 list_for_each_entry(rdev, &mddev->disks, same_set) {
5121 sector_t avail = rdev->sectors;
5122
5123 if (fit && (num_sectors == 0 || num_sectors > avail))
5124 num_sectors = avail;
5125 if (avail < num_sectors)
5126 return -ENOSPC;
5127 }
5128 rv = mddev->pers->resize(mddev, num_sectors);
5129 if (!rv) {
5130 struct block_device *bdev;
5131
5132 bdev = bdget_disk(mddev->gendisk, 0);
5133 if (bdev) {
5134 mutex_lock(&bdev->bd_inode->i_mutex);
5135 i_size_write(bdev->bd_inode,
5136 (loff_t)mddev->array_sectors << 9);
5137 mutex_unlock(&bdev->bd_inode->i_mutex);
5138 bdput(bdev);
5139 }
5140 }
5141 return rv;
5142 }
5143
5144 static int update_raid_disks(mddev_t *mddev, int raid_disks)
5145 {
5146 int rv;
5147 /* change the number of raid disks */
5148 if (mddev->pers->check_reshape == NULL)
5149 return -EINVAL;
5150 if (raid_disks <= 0 ||
5151 raid_disks >= mddev->max_disks)
5152 return -EINVAL;
5153 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5154 return -EBUSY;
5155 mddev->delta_disks = raid_disks - mddev->raid_disks;
5156
5157 rv = mddev->pers->check_reshape(mddev);
5158 return rv;
5159 }
5160
5161
5162 /*
5163 * update_array_info is used to change the configuration of an
5164 * on-line array.
5165 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5166 * fields in the info are checked against the array.
5167 * Any differences that cannot be handled will cause an error.
5168 * Normally, only one change can be managed at a time.
5169 */
5170 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5171 {
5172 int rv = 0;
5173 int cnt = 0;
5174 int state = 0;
5175
5176 /* calculate expected state,ignoring low bits */
5177 if (mddev->bitmap && mddev->bitmap_offset)
5178 state |= (1 << MD_SB_BITMAP_PRESENT);
5179
5180 if (mddev->major_version != info->major_version ||
5181 mddev->minor_version != info->minor_version ||
5182 /* mddev->patch_version != info->patch_version || */
5183 mddev->ctime != info->ctime ||
5184 mddev->level != info->level ||
5185 /* mddev->layout != info->layout || */
5186 !mddev->persistent != info->not_persistent||
5187 mddev->chunk_size != info->chunk_size ||
5188 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5189 ((state^info->state) & 0xfffffe00)
5190 )
5191 return -EINVAL;
5192 /* Check there is only one change */
5193 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5194 cnt++;
5195 if (mddev->raid_disks != info->raid_disks)
5196 cnt++;
5197 if (mddev->layout != info->layout)
5198 cnt++;
5199 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5200 cnt++;
5201 if (cnt == 0)
5202 return 0;
5203 if (cnt > 1)
5204 return -EINVAL;
5205
5206 if (mddev->layout != info->layout) {
5207 /* Change layout
5208 * we don't need to do anything at the md level, the
5209 * personality will take care of it all.
5210 */
5211 if (mddev->pers->reconfig == NULL)
5212 return -EINVAL;
5213 else
5214 return mddev->pers->reconfig(mddev, info->layout, -1);
5215 }
5216 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5217 rv = update_size(mddev, (sector_t)info->size * 2);
5218
5219 if (mddev->raid_disks != info->raid_disks)
5220 rv = update_raid_disks(mddev, info->raid_disks);
5221
5222 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5223 if (mddev->pers->quiesce == NULL)
5224 return -EINVAL;
5225 if (mddev->recovery || mddev->sync_thread)
5226 return -EBUSY;
5227 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5228 /* add the bitmap */
5229 if (mddev->bitmap)
5230 return -EEXIST;
5231 if (mddev->default_bitmap_offset == 0)
5232 return -EINVAL;
5233 mddev->bitmap_offset = mddev->default_bitmap_offset;
5234 mddev->pers->quiesce(mddev, 1);
5235 rv = bitmap_create(mddev);
5236 if (rv)
5237 bitmap_destroy(mddev);
5238 mddev->pers->quiesce(mddev, 0);
5239 } else {
5240 /* remove the bitmap */
5241 if (!mddev->bitmap)
5242 return -ENOENT;
5243 if (mddev->bitmap->file)
5244 return -EINVAL;
5245 mddev->pers->quiesce(mddev, 1);
5246 bitmap_destroy(mddev);
5247 mddev->pers->quiesce(mddev, 0);
5248 mddev->bitmap_offset = 0;
5249 }
5250 }
5251 md_update_sb(mddev, 1);
5252 return rv;
5253 }
5254
5255 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5256 {
5257 mdk_rdev_t *rdev;
5258
5259 if (mddev->pers == NULL)
5260 return -ENODEV;
5261
5262 rdev = find_rdev(mddev, dev);
5263 if (!rdev)
5264 return -ENODEV;
5265
5266 md_error(mddev, rdev);
5267 return 0;
5268 }
5269
5270 /*
5271 * We have a problem here : there is no easy way to give a CHS
5272 * virtual geometry. We currently pretend that we have a 2 heads
5273 * 4 sectors (with a BIG number of cylinders...). This drives
5274 * dosfs just mad... ;-)
5275 */
5276 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5277 {
5278 mddev_t *mddev = bdev->bd_disk->private_data;
5279
5280 geo->heads = 2;
5281 geo->sectors = 4;
5282 geo->cylinders = get_capacity(mddev->gendisk) / 8;
5283 return 0;
5284 }
5285
5286 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5287 unsigned int cmd, unsigned long arg)
5288 {
5289 int err = 0;
5290 void __user *argp = (void __user *)arg;
5291 mddev_t *mddev = NULL;
5292
5293 if (!capable(CAP_SYS_ADMIN))
5294 return -EACCES;
5295
5296 /*
5297 * Commands dealing with the RAID driver but not any
5298 * particular array:
5299 */
5300 switch (cmd)
5301 {
5302 case RAID_VERSION:
5303 err = get_version(argp);
5304 goto done;
5305
5306 case PRINT_RAID_DEBUG:
5307 err = 0;
5308 md_print_devices();
5309 goto done;
5310
5311 #ifndef MODULE
5312 case RAID_AUTORUN:
5313 err = 0;
5314 autostart_arrays(arg);
5315 goto done;
5316 #endif
5317 default:;
5318 }
5319
5320 /*
5321 * Commands creating/starting a new array:
5322 */
5323
5324 mddev = bdev->bd_disk->private_data;
5325
5326 if (!mddev) {
5327 BUG();
5328 goto abort;
5329 }
5330
5331 err = mddev_lock(mddev);
5332 if (err) {
5333 printk(KERN_INFO
5334 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5335 err, cmd);
5336 goto abort;
5337 }
5338
5339 switch (cmd)
5340 {
5341 case SET_ARRAY_INFO:
5342 {
5343 mdu_array_info_t info;
5344 if (!arg)
5345 memset(&info, 0, sizeof(info));
5346 else if (copy_from_user(&info, argp, sizeof(info))) {
5347 err = -EFAULT;
5348 goto abort_unlock;
5349 }
5350 if (mddev->pers) {
5351 err = update_array_info(mddev, &info);
5352 if (err) {
5353 printk(KERN_WARNING "md: couldn't update"
5354 " array info. %d\n", err);
5355 goto abort_unlock;
5356 }
5357 goto done_unlock;
5358 }
5359 if (!list_empty(&mddev->disks)) {
5360 printk(KERN_WARNING
5361 "md: array %s already has disks!\n",
5362 mdname(mddev));
5363 err = -EBUSY;
5364 goto abort_unlock;
5365 }
5366 if (mddev->raid_disks) {
5367 printk(KERN_WARNING
5368 "md: array %s already initialised!\n",
5369 mdname(mddev));
5370 err = -EBUSY;
5371 goto abort_unlock;
5372 }
5373 err = set_array_info(mddev, &info);
5374 if (err) {
5375 printk(KERN_WARNING "md: couldn't set"
5376 " array info. %d\n", err);
5377 goto abort_unlock;
5378 }
5379 }
5380 goto done_unlock;
5381
5382 default:;
5383 }
5384
5385 /*
5386 * Commands querying/configuring an existing array:
5387 */
5388 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5389 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5390 if ((!mddev->raid_disks && !mddev->external)
5391 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5392 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5393 && cmd != GET_BITMAP_FILE) {
5394 err = -ENODEV;
5395 goto abort_unlock;
5396 }
5397
5398 /*
5399 * Commands even a read-only array can execute:
5400 */
5401 switch (cmd)
5402 {
5403 case GET_ARRAY_INFO:
5404 err = get_array_info(mddev, argp);
5405 goto done_unlock;
5406
5407 case GET_BITMAP_FILE:
5408 err = get_bitmap_file(mddev, argp);
5409 goto done_unlock;
5410
5411 case GET_DISK_INFO:
5412 err = get_disk_info(mddev, argp);
5413 goto done_unlock;
5414
5415 case RESTART_ARRAY_RW:
5416 err = restart_array(mddev);
5417 goto done_unlock;
5418
5419 case STOP_ARRAY:
5420 err = do_md_stop(mddev, 0, 1);
5421 goto done_unlock;
5422
5423 case STOP_ARRAY_RO:
5424 err = do_md_stop(mddev, 1, 1);
5425 goto done_unlock;
5426
5427 }
5428
5429 /*
5430 * The remaining ioctls are changing the state of the
5431 * superblock, so we do not allow them on read-only arrays.
5432 * However non-MD ioctls (e.g. get-size) will still come through
5433 * here and hit the 'default' below, so only disallow
5434 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5435 */
5436 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5437 if (mddev->ro == 2) {
5438 mddev->ro = 0;
5439 sysfs_notify_dirent(mddev->sysfs_state);
5440 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5441 md_wakeup_thread(mddev->thread);
5442 } else {
5443 err = -EROFS;
5444 goto abort_unlock;
5445 }
5446 }
5447
5448 switch (cmd)
5449 {
5450 case ADD_NEW_DISK:
5451 {
5452 mdu_disk_info_t info;
5453 if (copy_from_user(&info, argp, sizeof(info)))
5454 err = -EFAULT;
5455 else
5456 err = add_new_disk(mddev, &info);
5457 goto done_unlock;
5458 }
5459
5460 case HOT_REMOVE_DISK:
5461 err = hot_remove_disk(mddev, new_decode_dev(arg));
5462 goto done_unlock;
5463
5464 case HOT_ADD_DISK:
5465 err = hot_add_disk(mddev, new_decode_dev(arg));
5466 goto done_unlock;
5467
5468 case SET_DISK_FAULTY:
5469 err = set_disk_faulty(mddev, new_decode_dev(arg));
5470 goto done_unlock;
5471
5472 case RUN_ARRAY:
5473 err = do_md_run(mddev);
5474 goto done_unlock;
5475
5476 case SET_BITMAP_FILE:
5477 err = set_bitmap_file(mddev, (int)arg);
5478 goto done_unlock;
5479
5480 default:
5481 err = -EINVAL;
5482 goto abort_unlock;
5483 }
5484
5485 done_unlock:
5486 abort_unlock:
5487 if (mddev->hold_active == UNTIL_IOCTL &&
5488 err != -EINVAL)
5489 mddev->hold_active = 0;
5490 mddev_unlock(mddev);
5491
5492 return err;
5493 done:
5494 if (err)
5495 MD_BUG();
5496 abort:
5497 return err;
5498 }
5499
5500 static int md_open(struct block_device *bdev, fmode_t mode)
5501 {
5502 /*
5503 * Succeed if we can lock the mddev, which confirms that
5504 * it isn't being stopped right now.
5505 */
5506 mddev_t *mddev = mddev_find(bdev->bd_dev);
5507 int err;
5508
5509 if (mddev->gendisk != bdev->bd_disk) {
5510 /* we are racing with mddev_put which is discarding this
5511 * bd_disk.
5512 */
5513 mddev_put(mddev);
5514 /* Wait until bdev->bd_disk is definitely gone */
5515 flush_scheduled_work();
5516 /* Then retry the open from the top */
5517 return -ERESTARTSYS;
5518 }
5519 BUG_ON(mddev != bdev->bd_disk->private_data);
5520
5521 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
5522 goto out;
5523
5524 err = 0;
5525 atomic_inc(&mddev->openers);
5526 mddev_unlock(mddev);
5527
5528 check_disk_change(bdev);
5529 out:
5530 return err;
5531 }
5532
5533 static int md_release(struct gendisk *disk, fmode_t mode)
5534 {
5535 mddev_t *mddev = disk->private_data;
5536
5537 BUG_ON(!mddev);
5538 atomic_dec(&mddev->openers);
5539 mddev_put(mddev);
5540
5541 return 0;
5542 }
5543
5544 static int md_media_changed(struct gendisk *disk)
5545 {
5546 mddev_t *mddev = disk->private_data;
5547
5548 return mddev->changed;
5549 }
5550
5551 static int md_revalidate(struct gendisk *disk)
5552 {
5553 mddev_t *mddev = disk->private_data;
5554
5555 mddev->changed = 0;
5556 return 0;
5557 }
5558 static struct block_device_operations md_fops =
5559 {
5560 .owner = THIS_MODULE,
5561 .open = md_open,
5562 .release = md_release,
5563 .locked_ioctl = md_ioctl,
5564 .getgeo = md_getgeo,
5565 .media_changed = md_media_changed,
5566 .revalidate_disk= md_revalidate,
5567 };
5568
5569 static int md_thread(void * arg)
5570 {
5571 mdk_thread_t *thread = arg;
5572
5573 /*
5574 * md_thread is a 'system-thread', it's priority should be very
5575 * high. We avoid resource deadlocks individually in each
5576 * raid personality. (RAID5 does preallocation) We also use RR and
5577 * the very same RT priority as kswapd, thus we will never get
5578 * into a priority inversion deadlock.
5579 *
5580 * we definitely have to have equal or higher priority than
5581 * bdflush, otherwise bdflush will deadlock if there are too
5582 * many dirty RAID5 blocks.
5583 */
5584
5585 allow_signal(SIGKILL);
5586 while (!kthread_should_stop()) {
5587
5588 /* We need to wait INTERRUPTIBLE so that
5589 * we don't add to the load-average.
5590 * That means we need to be sure no signals are
5591 * pending
5592 */
5593 if (signal_pending(current))
5594 flush_signals(current);
5595
5596 wait_event_interruptible_timeout
5597 (thread->wqueue,
5598 test_bit(THREAD_WAKEUP, &thread->flags)
5599 || kthread_should_stop(),
5600 thread->timeout);
5601
5602 clear_bit(THREAD_WAKEUP, &thread->flags);
5603
5604 thread->run(thread->mddev);
5605 }
5606
5607 return 0;
5608 }
5609
5610 void md_wakeup_thread(mdk_thread_t *thread)
5611 {
5612 if (thread) {
5613 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5614 set_bit(THREAD_WAKEUP, &thread->flags);
5615 wake_up(&thread->wqueue);
5616 }
5617 }
5618
5619 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5620 const char *name)
5621 {
5622 mdk_thread_t *thread;
5623
5624 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5625 if (!thread)
5626 return NULL;
5627
5628 init_waitqueue_head(&thread->wqueue);
5629
5630 thread->run = run;
5631 thread->mddev = mddev;
5632 thread->timeout = MAX_SCHEDULE_TIMEOUT;
5633 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
5634 if (IS_ERR(thread->tsk)) {
5635 kfree(thread);
5636 return NULL;
5637 }
5638 return thread;
5639 }
5640
5641 void md_unregister_thread(mdk_thread_t *thread)
5642 {
5643 if (!thread)
5644 return;
5645 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
5646
5647 kthread_stop(thread->tsk);
5648 kfree(thread);
5649 }
5650
5651 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
5652 {
5653 if (!mddev) {
5654 MD_BUG();
5655 return;
5656 }
5657
5658 if (!rdev || test_bit(Faulty, &rdev->flags))
5659 return;
5660
5661 if (mddev->external)
5662 set_bit(Blocked, &rdev->flags);
5663 /*
5664 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5665 mdname(mddev),
5666 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5667 __builtin_return_address(0),__builtin_return_address(1),
5668 __builtin_return_address(2),__builtin_return_address(3));
5669 */
5670 if (!mddev->pers)
5671 return;
5672 if (!mddev->pers->error_handler)
5673 return;
5674 mddev->pers->error_handler(mddev,rdev);
5675 if (mddev->degraded)
5676 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5677 set_bit(StateChanged, &rdev->flags);
5678 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5679 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5680 md_wakeup_thread(mddev->thread);
5681 md_new_event_inintr(mddev);
5682 }
5683
5684 /* seq_file implementation /proc/mdstat */
5685
5686 static void status_unused(struct seq_file *seq)
5687 {
5688 int i = 0;
5689 mdk_rdev_t *rdev;
5690
5691 seq_printf(seq, "unused devices: ");
5692
5693 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
5694 char b[BDEVNAME_SIZE];
5695 i++;
5696 seq_printf(seq, "%s ",
5697 bdevname(rdev->bdev,b));
5698 }
5699 if (!i)
5700 seq_printf(seq, "<none>");
5701
5702 seq_printf(seq, "\n");
5703 }
5704
5705
5706 static void status_resync(struct seq_file *seq, mddev_t * mddev)
5707 {
5708 sector_t max_sectors, resync, res;
5709 unsigned long dt, db;
5710 sector_t rt;
5711 int scale;
5712 unsigned int per_milli;
5713
5714 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
5715
5716 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5717 max_sectors = mddev->resync_max_sectors;
5718 else
5719 max_sectors = mddev->dev_sectors;
5720
5721 /*
5722 * Should not happen.
5723 */
5724 if (!max_sectors) {
5725 MD_BUG();
5726 return;
5727 }
5728 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5729 * in a sector_t, and (max_sectors>>scale) will fit in a
5730 * u32, as those are the requirements for sector_div.
5731 * Thus 'scale' must be at least 10
5732 */
5733 scale = 10;
5734 if (sizeof(sector_t) > sizeof(unsigned long)) {
5735 while ( max_sectors/2 > (1ULL<<(scale+32)))
5736 scale++;
5737 }
5738 res = (resync>>scale)*1000;
5739 sector_div(res, (u32)((max_sectors>>scale)+1));
5740
5741 per_milli = res;
5742 {
5743 int i, x = per_milli/50, y = 20-x;
5744 seq_printf(seq, "[");
5745 for (i = 0; i < x; i++)
5746 seq_printf(seq, "=");
5747 seq_printf(seq, ">");
5748 for (i = 0; i < y; i++)
5749 seq_printf(seq, ".");
5750 seq_printf(seq, "] ");
5751 }
5752 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
5753 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5754 "reshape" :
5755 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5756 "check" :
5757 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5758 "resync" : "recovery"))),
5759 per_milli/10, per_milli % 10,
5760 (unsigned long long) resync/2,
5761 (unsigned long long) max_sectors/2);
5762
5763 /*
5764 * dt: time from mark until now
5765 * db: blocks written from mark until now
5766 * rt: remaining time
5767 *
5768 * rt is a sector_t, so could be 32bit or 64bit.
5769 * So we divide before multiply in case it is 32bit and close
5770 * to the limit.
5771 * We scale the divisor (db) by 32 to avoid loosing precision
5772 * near the end of resync when the number of remaining sectors
5773 * is close to 'db'.
5774 * We then divide rt by 32 after multiplying by db to compensate.
5775 * The '+1' avoids division by zero if db is very small.
5776 */
5777 dt = ((jiffies - mddev->resync_mark) / HZ);
5778 if (!dt) dt++;
5779 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5780 - mddev->resync_mark_cnt;
5781
5782 rt = max_sectors - resync; /* number of remaining sectors */
5783 sector_div(rt, db/32+1);
5784 rt *= dt;
5785 rt >>= 5;
5786
5787 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
5788 ((unsigned long)rt % 60)/6);
5789
5790 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
5791 }
5792
5793 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5794 {
5795 struct list_head *tmp;
5796 loff_t l = *pos;
5797 mddev_t *mddev;
5798
5799 if (l >= 0x10000)
5800 return NULL;
5801 if (!l--)
5802 /* header */
5803 return (void*)1;
5804
5805 spin_lock(&all_mddevs_lock);
5806 list_for_each(tmp,&all_mddevs)
5807 if (!l--) {
5808 mddev = list_entry(tmp, mddev_t, all_mddevs);
5809 mddev_get(mddev);
5810 spin_unlock(&all_mddevs_lock);
5811 return mddev;
5812 }
5813 spin_unlock(&all_mddevs_lock);
5814 if (!l--)
5815 return (void*)2;/* tail */
5816 return NULL;
5817 }
5818
5819 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
5820 {
5821 struct list_head *tmp;
5822 mddev_t *next_mddev, *mddev = v;
5823
5824 ++*pos;
5825 if (v == (void*)2)
5826 return NULL;
5827
5828 spin_lock(&all_mddevs_lock);
5829 if (v == (void*)1)
5830 tmp = all_mddevs.next;
5831 else
5832 tmp = mddev->all_mddevs.next;
5833 if (tmp != &all_mddevs)
5834 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
5835 else {
5836 next_mddev = (void*)2;
5837 *pos = 0x10000;
5838 }
5839 spin_unlock(&all_mddevs_lock);
5840
5841 if (v != (void*)1)
5842 mddev_put(mddev);
5843 return next_mddev;
5844
5845 }
5846
5847 static void md_seq_stop(struct seq_file *seq, void *v)
5848 {
5849 mddev_t *mddev = v;
5850
5851 if (mddev && v != (void*)1 && v != (void*)2)
5852 mddev_put(mddev);
5853 }
5854
5855 struct mdstat_info {
5856 int event;
5857 };
5858
5859 static int md_seq_show(struct seq_file *seq, void *v)
5860 {
5861 mddev_t *mddev = v;
5862 sector_t sectors;
5863 mdk_rdev_t *rdev;
5864 struct mdstat_info *mi = seq->private;
5865 struct bitmap *bitmap;
5866
5867 if (v == (void*)1) {
5868 struct mdk_personality *pers;
5869 seq_printf(seq, "Personalities : ");
5870 spin_lock(&pers_lock);
5871 list_for_each_entry(pers, &pers_list, list)
5872 seq_printf(seq, "[%s] ", pers->name);
5873
5874 spin_unlock(&pers_lock);
5875 seq_printf(seq, "\n");
5876 mi->event = atomic_read(&md_event_count);
5877 return 0;
5878 }
5879 if (v == (void*)2) {
5880 status_unused(seq);
5881 return 0;
5882 }
5883
5884 if (mddev_lock(mddev) < 0)
5885 return -EINTR;
5886
5887 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5888 seq_printf(seq, "%s : %sactive", mdname(mddev),
5889 mddev->pers ? "" : "in");
5890 if (mddev->pers) {
5891 if (mddev->ro==1)
5892 seq_printf(seq, " (read-only)");
5893 if (mddev->ro==2)
5894 seq_printf(seq, " (auto-read-only)");
5895 seq_printf(seq, " %s", mddev->pers->name);
5896 }
5897
5898 sectors = 0;
5899 list_for_each_entry(rdev, &mddev->disks, same_set) {
5900 char b[BDEVNAME_SIZE];
5901 seq_printf(seq, " %s[%d]",
5902 bdevname(rdev->bdev,b), rdev->desc_nr);
5903 if (test_bit(WriteMostly, &rdev->flags))
5904 seq_printf(seq, "(W)");
5905 if (test_bit(Faulty, &rdev->flags)) {
5906 seq_printf(seq, "(F)");
5907 continue;
5908 } else if (rdev->raid_disk < 0)
5909 seq_printf(seq, "(S)"); /* spare */
5910 sectors += rdev->sectors;
5911 }
5912
5913 if (!list_empty(&mddev->disks)) {
5914 if (mddev->pers)
5915 seq_printf(seq, "\n %llu blocks",
5916 (unsigned long long)
5917 mddev->array_sectors / 2);
5918 else
5919 seq_printf(seq, "\n %llu blocks",
5920 (unsigned long long)sectors / 2);
5921 }
5922 if (mddev->persistent) {
5923 if (mddev->major_version != 0 ||
5924 mddev->minor_version != 90) {
5925 seq_printf(seq," super %d.%d",
5926 mddev->major_version,
5927 mddev->minor_version);
5928 }
5929 } else if (mddev->external)
5930 seq_printf(seq, " super external:%s",
5931 mddev->metadata_type);
5932 else
5933 seq_printf(seq, " super non-persistent");
5934
5935 if (mddev->pers) {
5936 mddev->pers->status(seq, mddev);
5937 seq_printf(seq, "\n ");
5938 if (mddev->pers->sync_request) {
5939 if (mddev->curr_resync > 2) {
5940 status_resync(seq, mddev);
5941 seq_printf(seq, "\n ");
5942 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5943 seq_printf(seq, "\tresync=DELAYED\n ");
5944 else if (mddev->recovery_cp < MaxSector)
5945 seq_printf(seq, "\tresync=PENDING\n ");
5946 }
5947 } else
5948 seq_printf(seq, "\n ");
5949
5950 if ((bitmap = mddev->bitmap)) {
5951 unsigned long chunk_kb;
5952 unsigned long flags;
5953 spin_lock_irqsave(&bitmap->lock, flags);
5954 chunk_kb = bitmap->chunksize >> 10;
5955 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5956 "%lu%s chunk",
5957 bitmap->pages - bitmap->missing_pages,
5958 bitmap->pages,
5959 (bitmap->pages - bitmap->missing_pages)
5960 << (PAGE_SHIFT - 10),
5961 chunk_kb ? chunk_kb : bitmap->chunksize,
5962 chunk_kb ? "KB" : "B");
5963 if (bitmap->file) {
5964 seq_printf(seq, ", file: ");
5965 seq_path(seq, &bitmap->file->f_path, " \t\n");
5966 }
5967
5968 seq_printf(seq, "\n");
5969 spin_unlock_irqrestore(&bitmap->lock, flags);
5970 }
5971
5972 seq_printf(seq, "\n");
5973 }
5974 mddev_unlock(mddev);
5975
5976 return 0;
5977 }
5978
5979 static struct seq_operations md_seq_ops = {
5980 .start = md_seq_start,
5981 .next = md_seq_next,
5982 .stop = md_seq_stop,
5983 .show = md_seq_show,
5984 };
5985
5986 static int md_seq_open(struct inode *inode, struct file *file)
5987 {
5988 int error;
5989 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5990 if (mi == NULL)
5991 return -ENOMEM;
5992
5993 error = seq_open(file, &md_seq_ops);
5994 if (error)
5995 kfree(mi);
5996 else {
5997 struct seq_file *p = file->private_data;
5998 p->private = mi;
5999 mi->event = atomic_read(&md_event_count);
6000 }
6001 return error;
6002 }
6003
6004 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6005 {
6006 struct seq_file *m = filp->private_data;
6007 struct mdstat_info *mi = m->private;
6008 int mask;
6009
6010 poll_wait(filp, &md_event_waiters, wait);
6011
6012 /* always allow read */
6013 mask = POLLIN | POLLRDNORM;
6014
6015 if (mi->event != atomic_read(&md_event_count))
6016 mask |= POLLERR | POLLPRI;
6017 return mask;
6018 }
6019
6020 static const struct file_operations md_seq_fops = {
6021 .owner = THIS_MODULE,
6022 .open = md_seq_open,
6023 .read = seq_read,
6024 .llseek = seq_lseek,
6025 .release = seq_release_private,
6026 .poll = mdstat_poll,
6027 };
6028
6029 int register_md_personality(struct mdk_personality *p)
6030 {
6031 spin_lock(&pers_lock);
6032 list_add_tail(&p->list, &pers_list);
6033 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
6034 spin_unlock(&pers_lock);
6035 return 0;
6036 }
6037
6038 int unregister_md_personality(struct mdk_personality *p)
6039 {
6040 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
6041 spin_lock(&pers_lock);
6042 list_del_init(&p->list);
6043 spin_unlock(&pers_lock);
6044 return 0;
6045 }
6046
6047 static int is_mddev_idle(mddev_t *mddev, int init)
6048 {
6049 mdk_rdev_t * rdev;
6050 int idle;
6051 int curr_events;
6052
6053 idle = 1;
6054 rcu_read_lock();
6055 rdev_for_each_rcu(rdev, mddev) {
6056 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
6057 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6058 (int)part_stat_read(&disk->part0, sectors[1]) -
6059 atomic_read(&disk->sync_io);
6060 /* sync IO will cause sync_io to increase before the disk_stats
6061 * as sync_io is counted when a request starts, and
6062 * disk_stats is counted when it completes.
6063 * So resync activity will cause curr_events to be smaller than
6064 * when there was no such activity.
6065 * non-sync IO will cause disk_stat to increase without
6066 * increasing sync_io so curr_events will (eventually)
6067 * be larger than it was before. Once it becomes
6068 * substantially larger, the test below will cause
6069 * the array to appear non-idle, and resync will slow
6070 * down.
6071 * If there is a lot of outstanding resync activity when
6072 * we set last_event to curr_events, then all that activity
6073 * completing might cause the array to appear non-idle
6074 * and resync will be slowed down even though there might
6075 * not have been non-resync activity. This will only
6076 * happen once though. 'last_events' will soon reflect
6077 * the state where there is little or no outstanding
6078 * resync requests, and further resync activity will
6079 * always make curr_events less than last_events.
6080 *
6081 */
6082 if (init || curr_events - rdev->last_events > 64) {
6083 rdev->last_events = curr_events;
6084 idle = 0;
6085 }
6086 }
6087 rcu_read_unlock();
6088 return idle;
6089 }
6090
6091 void md_done_sync(mddev_t *mddev, int blocks, int ok)
6092 {
6093 /* another "blocks" (512byte) blocks have been synced */
6094 atomic_sub(blocks, &mddev->recovery_active);
6095 wake_up(&mddev->recovery_wait);
6096 if (!ok) {
6097 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6098 md_wakeup_thread(mddev->thread);
6099 // stop recovery, signal do_sync ....
6100 }
6101 }
6102
6103
6104 /* md_write_start(mddev, bi)
6105 * If we need to update some array metadata (e.g. 'active' flag
6106 * in superblock) before writing, schedule a superblock update
6107 * and wait for it to complete.
6108 */
6109 void md_write_start(mddev_t *mddev, struct bio *bi)
6110 {
6111 int did_change = 0;
6112 if (bio_data_dir(bi) != WRITE)
6113 return;
6114
6115 BUG_ON(mddev->ro == 1);
6116 if (mddev->ro == 2) {
6117 /* need to switch to read/write */
6118 mddev->ro = 0;
6119 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6120 md_wakeup_thread(mddev->thread);
6121 md_wakeup_thread(mddev->sync_thread);
6122 did_change = 1;
6123 }
6124 atomic_inc(&mddev->writes_pending);
6125 if (mddev->safemode == 1)
6126 mddev->safemode = 0;
6127 if (mddev->in_sync) {
6128 spin_lock_irq(&mddev->write_lock);
6129 if (mddev->in_sync) {
6130 mddev->in_sync = 0;
6131 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6132 md_wakeup_thread(mddev->thread);
6133 did_change = 1;
6134 }
6135 spin_unlock_irq(&mddev->write_lock);
6136 }
6137 if (did_change)
6138 sysfs_notify_dirent(mddev->sysfs_state);
6139 wait_event(mddev->sb_wait,
6140 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
6141 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6142 }
6143
6144 void md_write_end(mddev_t *mddev)
6145 {
6146 if (atomic_dec_and_test(&mddev->writes_pending)) {
6147 if (mddev->safemode == 2)
6148 md_wakeup_thread(mddev->thread);
6149 else if (mddev->safemode_delay)
6150 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6151 }
6152 }
6153
6154 /* md_allow_write(mddev)
6155 * Calling this ensures that the array is marked 'active' so that writes
6156 * may proceed without blocking. It is important to call this before
6157 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6158 * Must be called with mddev_lock held.
6159 *
6160 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6161 * is dropped, so return -EAGAIN after notifying userspace.
6162 */
6163 int md_allow_write(mddev_t *mddev)
6164 {
6165 if (!mddev->pers)
6166 return 0;
6167 if (mddev->ro)
6168 return 0;
6169 if (!mddev->pers->sync_request)
6170 return 0;
6171
6172 spin_lock_irq(&mddev->write_lock);
6173 if (mddev->in_sync) {
6174 mddev->in_sync = 0;
6175 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6176 if (mddev->safemode_delay &&
6177 mddev->safemode == 0)
6178 mddev->safemode = 1;
6179 spin_unlock_irq(&mddev->write_lock);
6180 md_update_sb(mddev, 0);
6181 sysfs_notify_dirent(mddev->sysfs_state);
6182 } else
6183 spin_unlock_irq(&mddev->write_lock);
6184
6185 if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
6186 return -EAGAIN;
6187 else
6188 return 0;
6189 }
6190 EXPORT_SYMBOL_GPL(md_allow_write);
6191
6192 #define SYNC_MARKS 10
6193 #define SYNC_MARK_STEP (3*HZ)
6194 void md_do_sync(mddev_t *mddev)
6195 {
6196 mddev_t *mddev2;
6197 unsigned int currspeed = 0,
6198 window;
6199 sector_t max_sectors,j, io_sectors;
6200 unsigned long mark[SYNC_MARKS];
6201 sector_t mark_cnt[SYNC_MARKS];
6202 int last_mark,m;
6203 struct list_head *tmp;
6204 sector_t last_check;
6205 int skipped = 0;
6206 mdk_rdev_t *rdev;
6207 char *desc;
6208
6209 /* just incase thread restarts... */
6210 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6211 return;
6212 if (mddev->ro) /* never try to sync a read-only array */
6213 return;
6214
6215 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6216 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6217 desc = "data-check";
6218 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6219 desc = "requested-resync";
6220 else
6221 desc = "resync";
6222 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6223 desc = "reshape";
6224 else
6225 desc = "recovery";
6226
6227 /* we overload curr_resync somewhat here.
6228 * 0 == not engaged in resync at all
6229 * 2 == checking that there is no conflict with another sync
6230 * 1 == like 2, but have yielded to allow conflicting resync to
6231 * commense
6232 * other == active in resync - this many blocks
6233 *
6234 * Before starting a resync we must have set curr_resync to
6235 * 2, and then checked that every "conflicting" array has curr_resync
6236 * less than ours. When we find one that is the same or higher
6237 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6238 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6239 * This will mean we have to start checking from the beginning again.
6240 *
6241 */
6242
6243 do {
6244 mddev->curr_resync = 2;
6245
6246 try_again:
6247 if (kthread_should_stop()) {
6248 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6249 goto skip;
6250 }
6251 for_each_mddev(mddev2, tmp) {
6252 if (mddev2 == mddev)
6253 continue;
6254 if (!mddev->parallel_resync
6255 && mddev2->curr_resync
6256 && match_mddev_units(mddev, mddev2)) {
6257 DEFINE_WAIT(wq);
6258 if (mddev < mddev2 && mddev->curr_resync == 2) {
6259 /* arbitrarily yield */
6260 mddev->curr_resync = 1;
6261 wake_up(&resync_wait);
6262 }
6263 if (mddev > mddev2 && mddev->curr_resync == 1)
6264 /* no need to wait here, we can wait the next
6265 * time 'round when curr_resync == 2
6266 */
6267 continue;
6268 /* We need to wait 'interruptible' so as not to
6269 * contribute to the load average, and not to
6270 * be caught by 'softlockup'
6271 */
6272 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
6273 if (!kthread_should_stop() &&
6274 mddev2->curr_resync >= mddev->curr_resync) {
6275 printk(KERN_INFO "md: delaying %s of %s"
6276 " until %s has finished (they"
6277 " share one or more physical units)\n",
6278 desc, mdname(mddev), mdname(mddev2));
6279 mddev_put(mddev2);
6280 if (signal_pending(current))
6281 flush_signals(current);
6282 schedule();
6283 finish_wait(&resync_wait, &wq);
6284 goto try_again;
6285 }
6286 finish_wait(&resync_wait, &wq);
6287 }
6288 }
6289 } while (mddev->curr_resync < 2);
6290
6291 j = 0;
6292 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6293 /* resync follows the size requested by the personality,
6294 * which defaults to physical size, but can be virtual size
6295 */
6296 max_sectors = mddev->resync_max_sectors;
6297 mddev->resync_mismatches = 0;
6298 /* we don't use the checkpoint if there's a bitmap */
6299 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6300 j = mddev->resync_min;
6301 else if (!mddev->bitmap)
6302 j = mddev->recovery_cp;
6303
6304 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6305 max_sectors = mddev->dev_sectors;
6306 else {
6307 /* recovery follows the physical size of devices */
6308 max_sectors = mddev->dev_sectors;
6309 j = MaxSector;
6310 list_for_each_entry(rdev, &mddev->disks, same_set)
6311 if (rdev->raid_disk >= 0 &&
6312 !test_bit(Faulty, &rdev->flags) &&
6313 !test_bit(In_sync, &rdev->flags) &&
6314 rdev->recovery_offset < j)
6315 j = rdev->recovery_offset;
6316 }
6317
6318 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6319 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6320 " %d KB/sec/disk.\n", speed_min(mddev));
6321 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6322 "(but not more than %d KB/sec) for %s.\n",
6323 speed_max(mddev), desc);
6324
6325 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6326
6327 io_sectors = 0;
6328 for (m = 0; m < SYNC_MARKS; m++) {
6329 mark[m] = jiffies;
6330 mark_cnt[m] = io_sectors;
6331 }
6332 last_mark = 0;
6333 mddev->resync_mark = mark[last_mark];
6334 mddev->resync_mark_cnt = mark_cnt[last_mark];
6335
6336 /*
6337 * Tune reconstruction:
6338 */
6339 window = 32*(PAGE_SIZE/512);
6340 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
6341 window/2,(unsigned long long) max_sectors/2);
6342
6343 atomic_set(&mddev->recovery_active, 0);
6344 last_check = 0;
6345
6346 if (j>2) {
6347 printk(KERN_INFO
6348 "md: resuming %s of %s from checkpoint.\n",
6349 desc, mdname(mddev));
6350 mddev->curr_resync = j;
6351 }
6352
6353 while (j < max_sectors) {
6354 sector_t sectors;
6355
6356 skipped = 0;
6357
6358 if ((mddev->curr_resync > mddev->curr_resync_completed &&
6359 (mddev->curr_resync - mddev->curr_resync_completed)
6360 > (max_sectors >> 4)) ||
6361 (j - mddev->curr_resync_completed)*2
6362 >= mddev->resync_max - mddev->curr_resync_completed
6363 ) {
6364 /* time to update curr_resync_completed */
6365 blk_unplug(mddev->queue);
6366 wait_event(mddev->recovery_wait,
6367 atomic_read(&mddev->recovery_active) == 0);
6368 mddev->curr_resync_completed =
6369 mddev->curr_resync;
6370 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6371 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6372 }
6373
6374 if (j >= mddev->resync_max)
6375 wait_event(mddev->recovery_wait,
6376 mddev->resync_max > j
6377 || kthread_should_stop());
6378
6379 if (kthread_should_stop())
6380 goto interrupted;
6381
6382 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6383 currspeed < speed_min(mddev));
6384 if (sectors == 0) {
6385 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6386 goto out;
6387 }
6388
6389 if (!skipped) { /* actual IO requested */
6390 io_sectors += sectors;
6391 atomic_add(sectors, &mddev->recovery_active);
6392 }
6393
6394 j += sectors;
6395 if (j>1) mddev->curr_resync = j;
6396 mddev->curr_mark_cnt = io_sectors;
6397 if (last_check == 0)
6398 /* this is the earliers that rebuilt will be
6399 * visible in /proc/mdstat
6400 */
6401 md_new_event(mddev);
6402
6403 if (last_check + window > io_sectors || j == max_sectors)
6404 continue;
6405
6406 last_check = io_sectors;
6407
6408 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6409 break;
6410
6411 repeat:
6412 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6413 /* step marks */
6414 int next = (last_mark+1) % SYNC_MARKS;
6415
6416 mddev->resync_mark = mark[next];
6417 mddev->resync_mark_cnt = mark_cnt[next];
6418 mark[next] = jiffies;
6419 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
6420 last_mark = next;
6421 }
6422
6423
6424 if (kthread_should_stop())
6425 goto interrupted;
6426
6427
6428 /*
6429 * this loop exits only if either when we are slower than
6430 * the 'hard' speed limit, or the system was IO-idle for
6431 * a jiffy.
6432 * the system might be non-idle CPU-wise, but we only care
6433 * about not overloading the IO subsystem. (things like an
6434 * e2fsck being done on the RAID array should execute fast)
6435 */
6436 blk_unplug(mddev->queue);
6437 cond_resched();
6438
6439 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6440 /((jiffies-mddev->resync_mark)/HZ +1) +1;
6441
6442 if (currspeed > speed_min(mddev)) {
6443 if ((currspeed > speed_max(mddev)) ||
6444 !is_mddev_idle(mddev, 0)) {
6445 msleep(500);
6446 goto repeat;
6447 }
6448 }
6449 }
6450 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
6451 /*
6452 * this also signals 'finished resyncing' to md_stop
6453 */
6454 out:
6455 blk_unplug(mddev->queue);
6456
6457 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6458
6459 /* tell personality that we are finished */
6460 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
6461
6462 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
6463 mddev->curr_resync > 2) {
6464 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6465 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6466 if (mddev->curr_resync >= mddev->recovery_cp) {
6467 printk(KERN_INFO
6468 "md: checkpointing %s of %s.\n",
6469 desc, mdname(mddev));
6470 mddev->recovery_cp = mddev->curr_resync;
6471 }
6472 } else
6473 mddev->recovery_cp = MaxSector;
6474 } else {
6475 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6476 mddev->curr_resync = MaxSector;
6477 list_for_each_entry(rdev, &mddev->disks, same_set)
6478 if (rdev->raid_disk >= 0 &&
6479 !test_bit(Faulty, &rdev->flags) &&
6480 !test_bit(In_sync, &rdev->flags) &&
6481 rdev->recovery_offset < mddev->curr_resync)
6482 rdev->recovery_offset = mddev->curr_resync;
6483 }
6484 }
6485 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6486
6487 skip:
6488 mddev->curr_resync = 0;
6489 mddev->curr_resync_completed = 0;
6490 mddev->resync_min = 0;
6491 mddev->resync_max = MaxSector;
6492 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6493 wake_up(&resync_wait);
6494 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6495 md_wakeup_thread(mddev->thread);
6496 return;
6497
6498 interrupted:
6499 /*
6500 * got a signal, exit.
6501 */
6502 printk(KERN_INFO
6503 "md: md_do_sync() got signal ... exiting\n");
6504 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6505 goto out;
6506
6507 }
6508 EXPORT_SYMBOL_GPL(md_do_sync);
6509
6510
6511 static int remove_and_add_spares(mddev_t *mddev)
6512 {
6513 mdk_rdev_t *rdev;
6514 int spares = 0;
6515
6516 mddev->curr_resync_completed = 0;
6517
6518 list_for_each_entry(rdev, &mddev->disks, same_set)
6519 if (rdev->raid_disk >= 0 &&
6520 !test_bit(Blocked, &rdev->flags) &&
6521 (test_bit(Faulty, &rdev->flags) ||
6522 ! test_bit(In_sync, &rdev->flags)) &&
6523 atomic_read(&rdev->nr_pending)==0) {
6524 if (mddev->pers->hot_remove_disk(
6525 mddev, rdev->raid_disk)==0) {
6526 char nm[20];
6527 sprintf(nm,"rd%d", rdev->raid_disk);
6528 sysfs_remove_link(&mddev->kobj, nm);
6529 rdev->raid_disk = -1;
6530 }
6531 }
6532
6533 if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) {
6534 list_for_each_entry(rdev, &mddev->disks, same_set) {
6535 if (rdev->raid_disk >= 0 &&
6536 !test_bit(In_sync, &rdev->flags) &&
6537 !test_bit(Blocked, &rdev->flags))
6538 spares++;
6539 if (rdev->raid_disk < 0
6540 && !test_bit(Faulty, &rdev->flags)) {
6541 rdev->recovery_offset = 0;
6542 if (mddev->pers->
6543 hot_add_disk(mddev, rdev) == 0) {
6544 char nm[20];
6545 sprintf(nm, "rd%d", rdev->raid_disk);
6546 if (sysfs_create_link(&mddev->kobj,
6547 &rdev->kobj, nm))
6548 printk(KERN_WARNING
6549 "md: cannot register "
6550 "%s for %s\n",
6551 nm, mdname(mddev));
6552 spares++;
6553 md_new_event(mddev);
6554 } else
6555 break;
6556 }
6557 }
6558 }
6559 return spares;
6560 }
6561 /*
6562 * This routine is regularly called by all per-raid-array threads to
6563 * deal with generic issues like resync and super-block update.
6564 * Raid personalities that don't have a thread (linear/raid0) do not
6565 * need this as they never do any recovery or update the superblock.
6566 *
6567 * It does not do any resync itself, but rather "forks" off other threads
6568 * to do that as needed.
6569 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6570 * "->recovery" and create a thread at ->sync_thread.
6571 * When the thread finishes it sets MD_RECOVERY_DONE
6572 * and wakeups up this thread which will reap the thread and finish up.
6573 * This thread also removes any faulty devices (with nr_pending == 0).
6574 *
6575 * The overall approach is:
6576 * 1/ if the superblock needs updating, update it.
6577 * 2/ If a recovery thread is running, don't do anything else.
6578 * 3/ If recovery has finished, clean up, possibly marking spares active.
6579 * 4/ If there are any faulty devices, remove them.
6580 * 5/ If array is degraded, try to add spares devices
6581 * 6/ If array has spares or is not in-sync, start a resync thread.
6582 */
6583 void md_check_recovery(mddev_t *mddev)
6584 {
6585 mdk_rdev_t *rdev;
6586
6587
6588 if (mddev->bitmap)
6589 bitmap_daemon_work(mddev->bitmap);
6590
6591 if (mddev->ro)
6592 return;
6593
6594 if (signal_pending(current)) {
6595 if (mddev->pers->sync_request && !mddev->external) {
6596 printk(KERN_INFO "md: %s in immediate safe mode\n",
6597 mdname(mddev));
6598 mddev->safemode = 2;
6599 }
6600 flush_signals(current);
6601 }
6602
6603 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
6604 return;
6605 if ( ! (
6606 (mddev->flags && !mddev->external) ||
6607 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
6608 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
6609 (mddev->external == 0 && mddev->safemode == 1) ||
6610 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6611 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
6612 ))
6613 return;
6614
6615 if (mddev_trylock(mddev)) {
6616 int spares = 0;
6617
6618 if (mddev->ro) {
6619 /* Only thing we do on a ro array is remove
6620 * failed devices.
6621 */
6622 remove_and_add_spares(mddev);
6623 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6624 goto unlock;
6625 }
6626
6627 if (!mddev->external) {
6628 int did_change = 0;
6629 spin_lock_irq(&mddev->write_lock);
6630 if (mddev->safemode &&
6631 !atomic_read(&mddev->writes_pending) &&
6632 !mddev->in_sync &&
6633 mddev->recovery_cp == MaxSector) {
6634 mddev->in_sync = 1;
6635 did_change = 1;
6636 if (mddev->persistent)
6637 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6638 }
6639 if (mddev->safemode == 1)
6640 mddev->safemode = 0;
6641 spin_unlock_irq(&mddev->write_lock);
6642 if (did_change)
6643 sysfs_notify_dirent(mddev->sysfs_state);
6644 }
6645
6646 if (mddev->flags)
6647 md_update_sb(mddev, 0);
6648
6649 list_for_each_entry(rdev, &mddev->disks, same_set)
6650 if (test_and_clear_bit(StateChanged, &rdev->flags))
6651 sysfs_notify_dirent(rdev->sysfs_state);
6652
6653
6654 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6655 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6656 /* resync/recovery still happening */
6657 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6658 goto unlock;
6659 }
6660 if (mddev->sync_thread) {
6661 /* resync has finished, collect result */
6662 md_unregister_thread(mddev->sync_thread);
6663 mddev->sync_thread = NULL;
6664 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
6665 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
6666 /* success...*/
6667 /* activate any spares */
6668 if (mddev->pers->spare_active(mddev))
6669 sysfs_notify(&mddev->kobj, NULL,
6670 "degraded");
6671 }
6672 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6673 mddev->pers->finish_reshape)
6674 mddev->pers->finish_reshape(mddev);
6675 md_update_sb(mddev, 1);
6676
6677 /* if array is no-longer degraded, then any saved_raid_disk
6678 * information must be scrapped
6679 */
6680 if (!mddev->degraded)
6681 list_for_each_entry(rdev, &mddev->disks, same_set)
6682 rdev->saved_raid_disk = -1;
6683
6684 mddev->recovery = 0;
6685 /* flag recovery needed just to double check */
6686 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6687 sysfs_notify_dirent(mddev->sysfs_action);
6688 md_new_event(mddev);
6689 goto unlock;
6690 }
6691 /* Set RUNNING before clearing NEEDED to avoid
6692 * any transients in the value of "sync_action".
6693 */
6694 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6695 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6696 /* Clear some bits that don't mean anything, but
6697 * might be left set
6698 */
6699 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6700 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
6701
6702 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6703 goto unlock;
6704 /* no recovery is running.
6705 * remove any failed drives, then
6706 * add spares if possible.
6707 * Spare are also removed and re-added, to allow
6708 * the personality to fail the re-add.
6709 */
6710
6711 if (mddev->reshape_position != MaxSector) {
6712 if (mddev->pers->check_reshape(mddev) != 0)
6713 /* Cannot proceed */
6714 goto unlock;
6715 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
6716 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6717 } else if ((spares = remove_and_add_spares(mddev))) {
6718 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6719 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
6720 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
6721 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6722 } else if (mddev->recovery_cp < MaxSector) {
6723 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6724 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6725 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6726 /* nothing to be done ... */
6727 goto unlock;
6728
6729 if (mddev->pers->sync_request) {
6730 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
6731 /* We are adding a device or devices to an array
6732 * which has the bitmap stored on all devices.
6733 * So make sure all bitmap pages get written
6734 */
6735 bitmap_write_all(mddev->bitmap);
6736 }
6737 mddev->sync_thread = md_register_thread(md_do_sync,
6738 mddev,
6739 "%s_resync");
6740 if (!mddev->sync_thread) {
6741 printk(KERN_ERR "%s: could not start resync"
6742 " thread...\n",
6743 mdname(mddev));
6744 /* leave the spares where they are, it shouldn't hurt */
6745 mddev->recovery = 0;
6746 } else
6747 md_wakeup_thread(mddev->sync_thread);
6748 sysfs_notify_dirent(mddev->sysfs_action);
6749 md_new_event(mddev);
6750 }
6751 unlock:
6752 if (!mddev->sync_thread) {
6753 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6754 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
6755 &mddev->recovery))
6756 if (mddev->sysfs_action)
6757 sysfs_notify_dirent(mddev->sysfs_action);
6758 }
6759 mddev_unlock(mddev);
6760 }
6761 }
6762
6763 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
6764 {
6765 sysfs_notify_dirent(rdev->sysfs_state);
6766 wait_event_timeout(rdev->blocked_wait,
6767 !test_bit(Blocked, &rdev->flags),
6768 msecs_to_jiffies(5000));
6769 rdev_dec_pending(rdev, mddev);
6770 }
6771 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
6772
6773 static int md_notify_reboot(struct notifier_block *this,
6774 unsigned long code, void *x)
6775 {
6776 struct list_head *tmp;
6777 mddev_t *mddev;
6778
6779 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
6780
6781 printk(KERN_INFO "md: stopping all md devices.\n");
6782
6783 for_each_mddev(mddev, tmp)
6784 if (mddev_trylock(mddev)) {
6785 /* Force a switch to readonly even array
6786 * appears to still be in use. Hence
6787 * the '100'.
6788 */
6789 do_md_stop(mddev, 1, 100);
6790 mddev_unlock(mddev);
6791 }
6792 /*
6793 * certain more exotic SCSI devices are known to be
6794 * volatile wrt too early system reboots. While the
6795 * right place to handle this issue is the given
6796 * driver, we do want to have a safe RAID driver ...
6797 */
6798 mdelay(1000*1);
6799 }
6800 return NOTIFY_DONE;
6801 }
6802
6803 static struct notifier_block md_notifier = {
6804 .notifier_call = md_notify_reboot,
6805 .next = NULL,
6806 .priority = INT_MAX, /* before any real devices */
6807 };
6808
6809 static void md_geninit(void)
6810 {
6811 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
6812
6813 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
6814 }
6815
6816 static int __init md_init(void)
6817 {
6818 if (register_blkdev(MD_MAJOR, "md"))
6819 return -1;
6820 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
6821 unregister_blkdev(MD_MAJOR, "md");
6822 return -1;
6823 }
6824 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
6825 md_probe, NULL, NULL);
6826 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
6827 md_probe, NULL, NULL);
6828
6829 register_reboot_notifier(&md_notifier);
6830 raid_table_header = register_sysctl_table(raid_root_table);
6831
6832 md_geninit();
6833 return 0;
6834 }
6835
6836
6837 #ifndef MODULE
6838
6839 /*
6840 * Searches all registered partitions for autorun RAID arrays
6841 * at boot time.
6842 */
6843
6844 static LIST_HEAD(all_detected_devices);
6845 struct detected_devices_node {
6846 struct list_head list;
6847 dev_t dev;
6848 };
6849
6850 void md_autodetect_dev(dev_t dev)
6851 {
6852 struct detected_devices_node *node_detected_dev;
6853
6854 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
6855 if (node_detected_dev) {
6856 node_detected_dev->dev = dev;
6857 list_add_tail(&node_detected_dev->list, &all_detected_devices);
6858 } else {
6859 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
6860 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
6861 }
6862 }
6863
6864
6865 static void autostart_arrays(int part)
6866 {
6867 mdk_rdev_t *rdev;
6868 struct detected_devices_node *node_detected_dev;
6869 dev_t dev;
6870 int i_scanned, i_passed;
6871
6872 i_scanned = 0;
6873 i_passed = 0;
6874
6875 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
6876
6877 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6878 i_scanned++;
6879 node_detected_dev = list_entry(all_detected_devices.next,
6880 struct detected_devices_node, list);
6881 list_del(&node_detected_dev->list);
6882 dev = node_detected_dev->dev;
6883 kfree(node_detected_dev);
6884 rdev = md_import_device(dev,0, 90);
6885 if (IS_ERR(rdev))
6886 continue;
6887
6888 if (test_bit(Faulty, &rdev->flags)) {
6889 MD_BUG();
6890 continue;
6891 }
6892 set_bit(AutoDetected, &rdev->flags);
6893 list_add(&rdev->same_set, &pending_raid_disks);
6894 i_passed++;
6895 }
6896
6897 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6898 i_scanned, i_passed);
6899
6900 autorun_devices(part);
6901 }
6902
6903 #endif /* !MODULE */
6904
6905 static __exit void md_exit(void)
6906 {
6907 mddev_t *mddev;
6908 struct list_head *tmp;
6909
6910 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
6911 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
6912
6913 unregister_blkdev(MD_MAJOR,"md");
6914 unregister_blkdev(mdp_major, "mdp");
6915 unregister_reboot_notifier(&md_notifier);
6916 unregister_sysctl_table(raid_table_header);
6917 remove_proc_entry("mdstat", NULL);
6918 for_each_mddev(mddev, tmp) {
6919 export_array(mddev);
6920 mddev->hold_active = 0;
6921 }
6922 }
6923
6924 subsys_initcall(md_init);
6925 module_exit(md_exit)
6926
6927 static int get_ro(char *buffer, struct kernel_param *kp)
6928 {
6929 return sprintf(buffer, "%d", start_readonly);
6930 }
6931 static int set_ro(const char *val, struct kernel_param *kp)
6932 {
6933 char *e;
6934 int num = simple_strtoul(val, &e, 10);
6935 if (*val && (*e == '\0' || *e == '\n')) {
6936 start_readonly = num;
6937 return 0;
6938 }
6939 return -EINVAL;
6940 }
6941
6942 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6943 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6944
6945 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
6946
6947 EXPORT_SYMBOL(register_md_personality);
6948 EXPORT_SYMBOL(unregister_md_personality);
6949 EXPORT_SYMBOL(md_error);
6950 EXPORT_SYMBOL(md_done_sync);
6951 EXPORT_SYMBOL(md_write_start);
6952 EXPORT_SYMBOL(md_write_end);
6953 EXPORT_SYMBOL(md_register_thread);
6954 EXPORT_SYMBOL(md_unregister_thread);
6955 EXPORT_SYMBOL(md_wakeup_thread);
6956 EXPORT_SYMBOL(md_check_recovery);
6957 MODULE_LICENSE("GPL");
6958 MODULE_ALIAS("md");
6959 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
Support for the Chinese Samsung S3C2440 based development boards