?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6/mini2440.git] / drivers / md / md.c
blob5b98bea4ff9b36ccd132398dd9f8cc5e5568b8f4
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 int alloc_disk_sb(mdk_rdev_t * rdev)
444 {
445 if (rdev->sb_page)
446 MD_BUG();
447
448 rdev->sb_page = alloc_page(GFP_KERNEL);
449 if (!rdev->sb_page) {
450 printk(KERN_ALERT "md: out of memory.\n");
451 return -ENOMEM;
452 }
453
454 return 0;
455 }
456
457 static void free_disk_sb(mdk_rdev_t * rdev)
458 {
459 if (rdev->sb_page) {
460 put_page(rdev->sb_page);
461 rdev->sb_loaded = 0;
462 rdev->sb_page = NULL;
463 rdev->sb_start = 0;
464 rdev->sectors = 0;
465 }
466 }
467
468
469 static void super_written(struct bio *bio, int error)
470 {
471 mdk_rdev_t *rdev = bio->bi_private;
472 mddev_t *mddev = rdev->mddev;
473
474 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
475 printk("md: super_written gets error=%d, uptodate=%d\n",
476 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
477 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
478 md_error(mddev, rdev);
479 }
480
481 if (atomic_dec_and_test(&mddev->pending_writes))
482 wake_up(&mddev->sb_wait);
483 bio_put(bio);
484 }
485
486 static void super_written_barrier(struct bio *bio, int error)
487 {
488 struct bio *bio2 = bio->bi_private;
489 mdk_rdev_t *rdev = bio2->bi_private;
490 mddev_t *mddev = rdev->mddev;
491
492 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
493 error == -EOPNOTSUPP) {
494 unsigned long flags;
495 /* barriers don't appear to be supported :-( */
496 set_bit(BarriersNotsupp, &rdev->flags);
497 mddev->barriers_work = 0;
498 spin_lock_irqsave(&mddev->write_lock, flags);
499 bio2->bi_next = mddev->biolist;
500 mddev->biolist = bio2;
501 spin_unlock_irqrestore(&mddev->write_lock, flags);
502 wake_up(&mddev->sb_wait);
503 bio_put(bio);
504 } else {
505 bio_put(bio2);
506 bio->bi_private = rdev;
507 super_written(bio, error);
508 }
509 }
510
511 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
512 sector_t sector, int size, struct page *page)
513 {
514 /* write first size bytes of page to sector of rdev
515 * Increment mddev->pending_writes before returning
516 * and decrement it on completion, waking up sb_wait
517 * if zero is reached.
518 * If an error occurred, call md_error
519 *
520 * As we might need to resubmit the request if BIO_RW_BARRIER
521 * causes ENOTSUPP, we allocate a spare bio...
522 */
523 struct bio *bio = bio_alloc(GFP_NOIO, 1);
524 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG);
525
526 bio->bi_bdev = rdev->bdev;
527 bio->bi_sector = sector;
528 bio_add_page(bio, page, size, 0);
529 bio->bi_private = rdev;
530 bio->bi_end_io = super_written;
531 bio->bi_rw = rw;
532
533 atomic_inc(&mddev->pending_writes);
534 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
535 struct bio *rbio;
536 rw |= (1<<BIO_RW_BARRIER);
537 rbio = bio_clone(bio, GFP_NOIO);
538 rbio->bi_private = bio;
539 rbio->bi_end_io = super_written_barrier;
540 submit_bio(rw, rbio);
541 } else
542 submit_bio(rw, bio);
543 }
544
545 void md_super_wait(mddev_t *mddev)
546 {
547 /* wait for all superblock writes that were scheduled to complete.
548 * if any had to be retried (due to BARRIER problems), retry them
549 */
550 DEFINE_WAIT(wq);
551 for(;;) {
552 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
553 if (atomic_read(&mddev->pending_writes)==0)
554 break;
555 while (mddev->biolist) {
556 struct bio *bio;
557 spin_lock_irq(&mddev->write_lock);
558 bio = mddev->biolist;
559 mddev->biolist = bio->bi_next ;
560 bio->bi_next = NULL;
561 spin_unlock_irq(&mddev->write_lock);
562 submit_bio(bio->bi_rw, bio);
563 }
564 schedule();
565 }
566 finish_wait(&mddev->sb_wait, &wq);
567 }
568
569 static void bi_complete(struct bio *bio, int error)
570 {
571 complete((struct completion*)bio->bi_private);
572 }
573
574 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
575 struct page *page, int rw)
576 {
577 struct bio *bio = bio_alloc(GFP_NOIO, 1);
578 struct completion event;
579 int ret;
580
581 rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
582
583 bio->bi_bdev = bdev;
584 bio->bi_sector = sector;
585 bio_add_page(bio, page, size, 0);
586 init_completion(&event);
587 bio->bi_private = &event;
588 bio->bi_end_io = bi_complete;
589 submit_bio(rw, bio);
590 wait_for_completion(&event);
591
592 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
593 bio_put(bio);
594 return ret;
595 }
596 EXPORT_SYMBOL_GPL(sync_page_io);
597
598 static int read_disk_sb(mdk_rdev_t * rdev, int size)
599 {
600 char b[BDEVNAME_SIZE];
601 if (!rdev->sb_page) {
602 MD_BUG();
603 return -EINVAL;
604 }
605 if (rdev->sb_loaded)
606 return 0;
607
608
609 if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ))
610 goto fail;
611 rdev->sb_loaded = 1;
612 return 0;
613
614 fail:
615 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
616 bdevname(rdev->bdev,b));
617 return -EINVAL;
618 }
619
620 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
621 {
622 return sb1->set_uuid0 == sb2->set_uuid0 &&
623 sb1->set_uuid1 == sb2->set_uuid1 &&
624 sb1->set_uuid2 == sb2->set_uuid2 &&
625 sb1->set_uuid3 == sb2->set_uuid3;
626 }
627
628 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
629 {
630 int ret;
631 mdp_super_t *tmp1, *tmp2;
632
633 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
634 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
635
636 if (!tmp1 || !tmp2) {
637 ret = 0;
638 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
639 goto abort;
640 }
641
642 *tmp1 = *sb1;
643 *tmp2 = *sb2;
644
645 /*
646 * nr_disks is not constant
647 */
648 tmp1->nr_disks = 0;
649 tmp2->nr_disks = 0;
650
651 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
652 abort:
653 kfree(tmp1);
654 kfree(tmp2);
655 return ret;
656 }
657
658
659 static u32 md_csum_fold(u32 csum)
660 {
661 csum = (csum & 0xffff) + (csum >> 16);
662 return (csum & 0xffff) + (csum >> 16);
663 }
664
665 static unsigned int calc_sb_csum(mdp_super_t * sb)
666 {
667 u64 newcsum = 0;
668 u32 *sb32 = (u32*)sb;
669 int i;
670 unsigned int disk_csum, csum;
671
672 disk_csum = sb->sb_csum;
673 sb->sb_csum = 0;
674
675 for (i = 0; i < MD_SB_BYTES/4 ; i++)
676 newcsum += sb32[i];
677 csum = (newcsum & 0xffffffff) + (newcsum>>32);
678
679
680 #ifdef CONFIG_ALPHA
681 /* This used to use csum_partial, which was wrong for several
682 * reasons including that different results are returned on
683 * different architectures. It isn't critical that we get exactly
684 * the same return value as before (we always csum_fold before
685 * testing, and that removes any differences). However as we
686 * know that csum_partial always returned a 16bit value on
687 * alphas, do a fold to maximise conformity to previous behaviour.
688 */
689 sb->sb_csum = md_csum_fold(disk_csum);
690 #else
691 sb->sb_csum = disk_csum;
692 #endif
693 return csum;
694 }
695
696
697 /*
698 * Handle superblock details.
699 * We want to be able to handle multiple superblock formats
700 * so we have a common interface to them all, and an array of
701 * different handlers.
702 * We rely on user-space to write the initial superblock, and support
703 * reading and updating of superblocks.
704 * Interface methods are:
705 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
706 * loads and validates a superblock on dev.
707 * if refdev != NULL, compare superblocks on both devices
708 * Return:
709 * 0 - dev has a superblock that is compatible with refdev
710 * 1 - dev has a superblock that is compatible and newer than refdev
711 * so dev should be used as the refdev in future
712 * -EINVAL superblock incompatible or invalid
713 * -othererror e.g. -EIO
714 *
715 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
716 * Verify that dev is acceptable into mddev.
717 * The first time, mddev->raid_disks will be 0, and data from
718 * dev should be merged in. Subsequent calls check that dev
719 * is new enough. Return 0 or -EINVAL
720 *
721 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
722 * Update the superblock for rdev with data in mddev
723 * This does not write to disc.
724 *
725 */
726
727 struct super_type {
728 char *name;
729 struct module *owner;
730 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
731 int minor_version);
732 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
733 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
734 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
735 sector_t num_sectors);
736 };
737
738 /*
739 * Check that the given mddev has no bitmap.
740 *
741 * This function is called from the run method of all personalities that do not
742 * support bitmaps. It prints an error message and returns non-zero if mddev
743 * has a bitmap. Otherwise, it returns 0.
744 *
745 */
746 int md_check_no_bitmap(mddev_t *mddev)
747 {
748 if (!mddev->bitmap_file && !mddev->bitmap_offset)
749 return 0;
750 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
751 mdname(mddev), mddev->pers->name);
752 return 1;
753 }
754 EXPORT_SYMBOL(md_check_no_bitmap);
755
756 /*
757 * load_super for 0.90.0
758 */
759 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
760 {
761 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
762 mdp_super_t *sb;
763 int ret;
764
765 /*
766 * Calculate the position of the superblock (512byte sectors),
767 * it's at the end of the disk.
768 *
769 * It also happens to be a multiple of 4Kb.
770 */
771 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
772
773 ret = read_disk_sb(rdev, MD_SB_BYTES);
774 if (ret) return ret;
775
776 ret = -EINVAL;
777
778 bdevname(rdev->bdev, b);
779 sb = (mdp_super_t*)page_address(rdev->sb_page);
780
781 if (sb->md_magic != MD_SB_MAGIC) {
782 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
783 b);
784 goto abort;
785 }
786
787 if (sb->major_version != 0 ||
788 sb->minor_version < 90 ||
789 sb->minor_version > 91) {
790 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
791 sb->major_version, sb->minor_version,
792 b);
793 goto abort;
794 }
795
796 if (sb->raid_disks <= 0)
797 goto abort;
798
799 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
800 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
801 b);
802 goto abort;
803 }
804
805 rdev->preferred_minor = sb->md_minor;
806 rdev->data_offset = 0;
807 rdev->sb_size = MD_SB_BYTES;
808
809 if (sb->level == LEVEL_MULTIPATH)
810 rdev->desc_nr = -1;
811 else
812 rdev->desc_nr = sb->this_disk.number;
813
814 if (!refdev) {
815 ret = 1;
816 } else {
817 __u64 ev1, ev2;
818 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
819 if (!uuid_equal(refsb, sb)) {
820 printk(KERN_WARNING "md: %s has different UUID to %s\n",
821 b, bdevname(refdev->bdev,b2));
822 goto abort;
823 }
824 if (!sb_equal(refsb, sb)) {
825 printk(KERN_WARNING "md: %s has same UUID"
826 " but different superblock to %s\n",
827 b, bdevname(refdev->bdev, b2));
828 goto abort;
829 }
830 ev1 = md_event(sb);
831 ev2 = md_event(refsb);
832 if (ev1 > ev2)
833 ret = 1;
834 else
835 ret = 0;
836 }
837 rdev->sectors = rdev->sb_start;
838
839 if (rdev->sectors < sb->size * 2 && sb->level > 1)
840 /* "this cannot possibly happen" ... */
841 ret = -EINVAL;
842
843 abort:
844 return ret;
845 }
846
847 /*
848 * validate_super for 0.90.0
849 */
850 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
851 {
852 mdp_disk_t *desc;
853 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
854 __u64 ev1 = md_event(sb);
855
856 rdev->raid_disk = -1;
857 clear_bit(Faulty, &rdev->flags);
858 clear_bit(In_sync, &rdev->flags);
859 clear_bit(WriteMostly, &rdev->flags);
860 clear_bit(BarriersNotsupp, &rdev->flags);
861
862 if (mddev->raid_disks == 0) {
863 mddev->major_version = 0;
864 mddev->minor_version = sb->minor_version;
865 mddev->patch_version = sb->patch_version;
866 mddev->external = 0;
867 mddev->chunk_sectors = sb->chunk_size >> 9;
868 mddev->ctime = sb->ctime;
869 mddev->utime = sb->utime;
870 mddev->level = sb->level;
871 mddev->clevel[0] = 0;
872 mddev->layout = sb->layout;
873 mddev->raid_disks = sb->raid_disks;
874 mddev->dev_sectors = sb->size * 2;
875 mddev->events = ev1;
876 mddev->bitmap_offset = 0;
877 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
878
879 if (mddev->minor_version >= 91) {
880 mddev->reshape_position = sb->reshape_position;
881 mddev->delta_disks = sb->delta_disks;
882 mddev->new_level = sb->new_level;
883 mddev->new_layout = sb->new_layout;
884 mddev->new_chunk_sectors = sb->new_chunk >> 9;
885 } else {
886 mddev->reshape_position = MaxSector;
887 mddev->delta_disks = 0;
888 mddev->new_level = mddev->level;
889 mddev->new_layout = mddev->layout;
890 mddev->new_chunk_sectors = mddev->chunk_sectors;
891 }
892
893 if (sb->state & (1<<MD_SB_CLEAN))
894 mddev->recovery_cp = MaxSector;
895 else {
896 if (sb->events_hi == sb->cp_events_hi &&
897 sb->events_lo == sb->cp_events_lo) {
898 mddev->recovery_cp = sb->recovery_cp;
899 } else
900 mddev->recovery_cp = 0;
901 }
902
903 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
904 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
905 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
906 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
907
908 mddev->max_disks = MD_SB_DISKS;
909
910 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
911 mddev->bitmap_file == NULL)
912 mddev->bitmap_offset = mddev->default_bitmap_offset;
913
914 } else if (mddev->pers == NULL) {
915 /* Insist on good event counter while assembling */
916 ++ev1;
917 if (ev1 < mddev->events)
918 return -EINVAL;
919 } else if (mddev->bitmap) {
920 /* if adding to array with a bitmap, then we can accept an
921 * older device ... but not too old.
922 */
923 if (ev1 < mddev->bitmap->events_cleared)
924 return 0;
925 } else {
926 if (ev1 < mddev->events)
927 /* just a hot-add of a new device, leave raid_disk at -1 */
928 return 0;
929 }
930
931 if (mddev->level != LEVEL_MULTIPATH) {
932 desc = sb->disks + rdev->desc_nr;
933
934 if (desc->state & (1<<MD_DISK_FAULTY))
935 set_bit(Faulty, &rdev->flags);
936 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
937 desc->raid_disk < mddev->raid_disks */) {
938 set_bit(In_sync, &rdev->flags);
939 rdev->raid_disk = desc->raid_disk;
940 }
941 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
942 set_bit(WriteMostly, &rdev->flags);
943 } else /* MULTIPATH are always insync */
944 set_bit(In_sync, &rdev->flags);
945 return 0;
946 }
947
948 /*
949 * sync_super for 0.90.0
950 */
951 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
952 {
953 mdp_super_t *sb;
954 mdk_rdev_t *rdev2;
955 int next_spare = mddev->raid_disks;
956
957
958 /* make rdev->sb match mddev data..
959 *
960 * 1/ zero out disks
961 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
962 * 3/ any empty disks < next_spare become removed
963 *
964 * disks[0] gets initialised to REMOVED because
965 * we cannot be sure from other fields if it has
966 * been initialised or not.
967 */
968 int i;
969 int active=0, working=0,failed=0,spare=0,nr_disks=0;
970
971 rdev->sb_size = MD_SB_BYTES;
972
973 sb = (mdp_super_t*)page_address(rdev->sb_page);
974
975 memset(sb, 0, sizeof(*sb));
976
977 sb->md_magic = MD_SB_MAGIC;
978 sb->major_version = mddev->major_version;
979 sb->patch_version = mddev->patch_version;
980 sb->gvalid_words = 0; /* ignored */
981 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
982 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
983 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
984 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
985
986 sb->ctime = mddev->ctime;
987 sb->level = mddev->level;
988 sb->size = mddev->dev_sectors / 2;
989 sb->raid_disks = mddev->raid_disks;
990 sb->md_minor = mddev->md_minor;
991 sb->not_persistent = 0;
992 sb->utime = mddev->utime;
993 sb->state = 0;
994 sb->events_hi = (mddev->events>>32);
995 sb->events_lo = (u32)mddev->events;
996
997 if (mddev->reshape_position == MaxSector)
998 sb->minor_version = 90;
999 else {
1000 sb->minor_version = 91;
1001 sb->reshape_position = mddev->reshape_position;
1002 sb->new_level = mddev->new_level;
1003 sb->delta_disks = mddev->delta_disks;
1004 sb->new_layout = mddev->new_layout;
1005 sb->new_chunk = mddev->new_chunk_sectors << 9;
1006 }
1007 mddev->minor_version = sb->minor_version;
1008 if (mddev->in_sync)
1009 {
1010 sb->recovery_cp = mddev->recovery_cp;
1011 sb->cp_events_hi = (mddev->events>>32);
1012 sb->cp_events_lo = (u32)mddev->events;
1013 if (mddev->recovery_cp == MaxSector)
1014 sb->state = (1<< MD_SB_CLEAN);
1015 } else
1016 sb->recovery_cp = 0;
1017
1018 sb->layout = mddev->layout;
1019 sb->chunk_size = mddev->chunk_sectors << 9;
1020
1021 if (mddev->bitmap && mddev->bitmap_file == NULL)
1022 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1023
1024 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1025 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1026 mdp_disk_t *d;
1027 int desc_nr;
1028 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
1029 && !test_bit(Faulty, &rdev2->flags))
1030 desc_nr = rdev2->raid_disk;
1031 else
1032 desc_nr = next_spare++;
1033 rdev2->desc_nr = desc_nr;
1034 d = &sb->disks[rdev2->desc_nr];
1035 nr_disks++;
1036 d->number = rdev2->desc_nr;
1037 d->major = MAJOR(rdev2->bdev->bd_dev);
1038 d->minor = MINOR(rdev2->bdev->bd_dev);
1039 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
1040 && !test_bit(Faulty, &rdev2->flags))
1041 d->raid_disk = rdev2->raid_disk;
1042 else
1043 d->raid_disk = rdev2->desc_nr; /* compatibility */
1044 if (test_bit(Faulty, &rdev2->flags))
1045 d->state = (1<<MD_DISK_FAULTY);
1046 else if (test_bit(In_sync, &rdev2->flags)) {
1047 d->state = (1<<MD_DISK_ACTIVE);
1048 d->state |= (1<<MD_DISK_SYNC);
1049 active++;
1050 working++;
1051 } else {
1052 d->state = 0;
1053 spare++;
1054 working++;
1055 }
1056 if (test_bit(WriteMostly, &rdev2->flags))
1057 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1058 }
1059 /* now set the "removed" and "faulty" bits on any missing devices */
1060 for (i=0 ; i < mddev->raid_disks ; i++) {
1061 mdp_disk_t *d = &sb->disks[i];
1062 if (d->state == 0 && d->number == 0) {
1063 d->number = i;
1064 d->raid_disk = i;
1065 d->state = (1<<MD_DISK_REMOVED);
1066 d->state |= (1<<MD_DISK_FAULTY);
1067 failed++;
1068 }
1069 }
1070 sb->nr_disks = nr_disks;
1071 sb->active_disks = active;
1072 sb->working_disks = working;
1073 sb->failed_disks = failed;
1074 sb->spare_disks = spare;
1075
1076 sb->this_disk = sb->disks[rdev->desc_nr];
1077 sb->sb_csum = calc_sb_csum(sb);
1078 }
1079
1080 /*
1081 * rdev_size_change for 0.90.0
1082 */
1083 static unsigned long long
1084 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1085 {
1086 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1087 return 0; /* component must fit device */
1088 if (rdev->mddev->bitmap_offset)
1089 return 0; /* can't move bitmap */
1090 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
1091 if (!num_sectors || num_sectors > rdev->sb_start)
1092 num_sectors = rdev->sb_start;
1093 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1094 rdev->sb_page);
1095 md_super_wait(rdev->mddev);
1096 return num_sectors / 2; /* kB for sysfs */
1097 }
1098
1099
1100 /*
1101 * version 1 superblock
1102 */
1103
1104 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1105 {
1106 __le32 disk_csum;
1107 u32 csum;
1108 unsigned long long newcsum;
1109 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1110 __le32 *isuper = (__le32*)sb;
1111 int i;
1112
1113 disk_csum = sb->sb_csum;
1114 sb->sb_csum = 0;
1115 newcsum = 0;
1116 for (i=0; size>=4; size -= 4 )
1117 newcsum += le32_to_cpu(*isuper++);
1118
1119 if (size == 2)
1120 newcsum += le16_to_cpu(*(__le16*) isuper);
1121
1122 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1123 sb->sb_csum = disk_csum;
1124 return cpu_to_le32(csum);
1125 }
1126
1127 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1128 {
1129 struct mdp_superblock_1 *sb;
1130 int ret;
1131 sector_t sb_start;
1132 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1133 int bmask;
1134
1135 /*
1136 * Calculate the position of the superblock in 512byte sectors.
1137 * It is always aligned to a 4K boundary and
1138 * depeding on minor_version, it can be:
1139 * 0: At least 8K, but less than 12K, from end of device
1140 * 1: At start of device
1141 * 2: 4K from start of device.
1142 */
1143 switch(minor_version) {
1144 case 0:
1145 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1146 sb_start -= 8*2;
1147 sb_start &= ~(sector_t)(4*2-1);
1148 break;
1149 case 1:
1150 sb_start = 0;
1151 break;
1152 case 2:
1153 sb_start = 8;
1154 break;
1155 default:
1156 return -EINVAL;
1157 }
1158 rdev->sb_start = sb_start;
1159
1160 /* superblock is rarely larger than 1K, but it can be larger,
1161 * and it is safe to read 4k, so we do that
1162 */
1163 ret = read_disk_sb(rdev, 4096);
1164 if (ret) return ret;
1165
1166
1167 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1168
1169 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1170 sb->major_version != cpu_to_le32(1) ||
1171 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1172 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1173 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1174 return -EINVAL;
1175
1176 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1177 printk("md: invalid superblock checksum on %s\n",
1178 bdevname(rdev->bdev,b));
1179 return -EINVAL;
1180 }
1181 if (le64_to_cpu(sb->data_size) < 10) {
1182 printk("md: data_size too small on %s\n",
1183 bdevname(rdev->bdev,b));
1184 return -EINVAL;
1185 }
1186
1187 rdev->preferred_minor = 0xffff;
1188 rdev->data_offset = le64_to_cpu(sb->data_offset);
1189 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1190
1191 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1192 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1193 if (rdev->sb_size & bmask)
1194 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1195
1196 if (minor_version
1197 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1198 return -EINVAL;
1199
1200 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1201 rdev->desc_nr = -1;
1202 else
1203 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1204
1205 if (!refdev) {
1206 ret = 1;
1207 } else {
1208 __u64 ev1, ev2;
1209 struct mdp_superblock_1 *refsb =
1210 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1211
1212 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1213 sb->level != refsb->level ||
1214 sb->layout != refsb->layout ||
1215 sb->chunksize != refsb->chunksize) {
1216 printk(KERN_WARNING "md: %s has strangely different"
1217 " superblock to %s\n",
1218 bdevname(rdev->bdev,b),
1219 bdevname(refdev->bdev,b2));
1220 return -EINVAL;
1221 }
1222 ev1 = le64_to_cpu(sb->events);
1223 ev2 = le64_to_cpu(refsb->events);
1224
1225 if (ev1 > ev2)
1226 ret = 1;
1227 else
1228 ret = 0;
1229 }
1230 if (minor_version)
1231 rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) -
1232 le64_to_cpu(sb->data_offset);
1233 else
1234 rdev->sectors = rdev->sb_start;
1235 if (rdev->sectors < le64_to_cpu(sb->data_size))
1236 return -EINVAL;
1237 rdev->sectors = le64_to_cpu(sb->data_size);
1238 if (le64_to_cpu(sb->size) > rdev->sectors)
1239 return -EINVAL;
1240 return ret;
1241 }
1242
1243 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1244 {
1245 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1246 __u64 ev1 = le64_to_cpu(sb->events);
1247
1248 rdev->raid_disk = -1;
1249 clear_bit(Faulty, &rdev->flags);
1250 clear_bit(In_sync, &rdev->flags);
1251 clear_bit(WriteMostly, &rdev->flags);
1252 clear_bit(BarriersNotsupp, &rdev->flags);
1253
1254 if (mddev->raid_disks == 0) {
1255 mddev->major_version = 1;
1256 mddev->patch_version = 0;
1257 mddev->external = 0;
1258 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1259 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1260 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1261 mddev->level = le32_to_cpu(sb->level);
1262 mddev->clevel[0] = 0;
1263 mddev->layout = le32_to_cpu(sb->layout);
1264 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1265 mddev->dev_sectors = le64_to_cpu(sb->size);
1266 mddev->events = ev1;
1267 mddev->bitmap_offset = 0;
1268 mddev->default_bitmap_offset = 1024 >> 9;
1269
1270 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1271 memcpy(mddev->uuid, sb->set_uuid, 16);
1272
1273 mddev->max_disks = (4096-256)/2;
1274
1275 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1276 mddev->bitmap_file == NULL )
1277 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1278
1279 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1280 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1281 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1282 mddev->new_level = le32_to_cpu(sb->new_level);
1283 mddev->new_layout = le32_to_cpu(sb->new_layout);
1284 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1285 } else {
1286 mddev->reshape_position = MaxSector;
1287 mddev->delta_disks = 0;
1288 mddev->new_level = mddev->level;
1289 mddev->new_layout = mddev->layout;
1290 mddev->new_chunk_sectors = mddev->chunk_sectors;
1291 }
1292
1293 } else if (mddev->pers == NULL) {
1294 /* Insist of good event counter while assembling */
1295 ++ev1;
1296 if (ev1 < mddev->events)
1297 return -EINVAL;
1298 } else if (mddev->bitmap) {
1299 /* If adding to array with a bitmap, then we can accept an
1300 * older device, but not too old.
1301 */
1302 if (ev1 < mddev->bitmap->events_cleared)
1303 return 0;
1304 } else {
1305 if (ev1 < mddev->events)
1306 /* just a hot-add of a new device, leave raid_disk at -1 */
1307 return 0;
1308 }
1309 if (mddev->level != LEVEL_MULTIPATH) {
1310 int role;
1311 if (rdev->desc_nr < 0 ||
1312 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1313 role = 0xffff;
1314 rdev->desc_nr = -1;
1315 } else
1316 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1317 switch(role) {
1318 case 0xffff: /* spare */
1319 break;
1320 case 0xfffe: /* faulty */
1321 set_bit(Faulty, &rdev->flags);
1322 break;
1323 default:
1324 if ((le32_to_cpu(sb->feature_map) &
1325 MD_FEATURE_RECOVERY_OFFSET))
1326 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1327 else
1328 set_bit(In_sync, &rdev->flags);
1329 rdev->raid_disk = role;
1330 break;
1331 }
1332 if (sb->devflags & WriteMostly1)
1333 set_bit(WriteMostly, &rdev->flags);
1334 } else /* MULTIPATH are always insync */
1335 set_bit(In_sync, &rdev->flags);
1336
1337 return 0;
1338 }
1339
1340 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1341 {
1342 struct mdp_superblock_1 *sb;
1343 mdk_rdev_t *rdev2;
1344 int max_dev, i;
1345 /* make rdev->sb match mddev and rdev data. */
1346
1347 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1348
1349 sb->feature_map = 0;
1350 sb->pad0 = 0;
1351 sb->recovery_offset = cpu_to_le64(0);
1352 memset(sb->pad1, 0, sizeof(sb->pad1));
1353 memset(sb->pad2, 0, sizeof(sb->pad2));
1354 memset(sb->pad3, 0, sizeof(sb->pad3));
1355
1356 sb->utime = cpu_to_le64((__u64)mddev->utime);
1357 sb->events = cpu_to_le64(mddev->events);
1358 if (mddev->in_sync)
1359 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1360 else
1361 sb->resync_offset = cpu_to_le64(0);
1362
1363 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1364
1365 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1366 sb->size = cpu_to_le64(mddev->dev_sectors);
1367 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1368 sb->level = cpu_to_le32(mddev->level);
1369 sb->layout = cpu_to_le32(mddev->layout);
1370
1371 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1372 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1373 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1374 }
1375
1376 if (rdev->raid_disk >= 0 &&
1377 !test_bit(In_sync, &rdev->flags)) {
1378 if (mddev->curr_resync_completed > rdev->recovery_offset)
1379 rdev->recovery_offset = mddev->curr_resync_completed;
1380 if (rdev->recovery_offset > 0) {
1381 sb->feature_map |=
1382 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1383 sb->recovery_offset =
1384 cpu_to_le64(rdev->recovery_offset);
1385 }
1386 }
1387
1388 if (mddev->reshape_position != MaxSector) {
1389 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1390 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1391 sb->new_layout = cpu_to_le32(mddev->new_layout);
1392 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1393 sb->new_level = cpu_to_le32(mddev->new_level);
1394 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1395 }
1396
1397 max_dev = 0;
1398 list_for_each_entry(rdev2, &mddev->disks, same_set)
1399 if (rdev2->desc_nr+1 > max_dev)
1400 max_dev = rdev2->desc_nr+1;
1401
1402 if (max_dev > le32_to_cpu(sb->max_dev)) {
1403 int bmask;
1404 sb->max_dev = cpu_to_le32(max_dev);
1405 rdev->sb_size = max_dev * 2 + 256;
1406 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1407 if (rdev->sb_size & bmask)
1408 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1409 }
1410 for (i=0; i<max_dev;i++)
1411 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1412
1413 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1414 i = rdev2->desc_nr;
1415 if (test_bit(Faulty, &rdev2->flags))
1416 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1417 else if (test_bit(In_sync, &rdev2->flags))
1418 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1419 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1420 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1421 else
1422 sb->dev_roles[i] = cpu_to_le16(0xffff);
1423 }
1424
1425 sb->sb_csum = calc_sb_1_csum(sb);
1426 }
1427
1428 static unsigned long long
1429 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1430 {
1431 struct mdp_superblock_1 *sb;
1432 sector_t max_sectors;
1433 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1434 return 0; /* component must fit device */
1435 if (rdev->sb_start < rdev->data_offset) {
1436 /* minor versions 1 and 2; superblock before data */
1437 max_sectors = rdev->bdev->bd_inode->i_size >> 9;
1438 max_sectors -= rdev->data_offset;
1439 if (!num_sectors || num_sectors > max_sectors)
1440 num_sectors = max_sectors;
1441 } else if (rdev->mddev->bitmap_offset) {
1442 /* minor version 0 with bitmap we can't move */
1443 return 0;
1444 } else {
1445 /* minor version 0; superblock after data */
1446 sector_t sb_start;
1447 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1448 sb_start &= ~(sector_t)(4*2 - 1);
1449 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1450 if (!num_sectors || num_sectors > max_sectors)
1451 num_sectors = max_sectors;
1452 rdev->sb_start = sb_start;
1453 }
1454 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1455 sb->data_size = cpu_to_le64(num_sectors);
1456 sb->super_offset = rdev->sb_start;
1457 sb->sb_csum = calc_sb_1_csum(sb);
1458 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1459 rdev->sb_page);
1460 md_super_wait(rdev->mddev);
1461 return num_sectors / 2; /* kB for sysfs */
1462 }
1463
1464 static struct super_type super_types[] = {
1465 [0] = {
1466 .name = "0.90.0",
1467 .owner = THIS_MODULE,
1468 .load_super = super_90_load,
1469 .validate_super = super_90_validate,
1470 .sync_super = super_90_sync,
1471 .rdev_size_change = super_90_rdev_size_change,
1472 },
1473 [1] = {
1474 .name = "md-1",
1475 .owner = THIS_MODULE,
1476 .load_super = super_1_load,
1477 .validate_super = super_1_validate,
1478 .sync_super = super_1_sync,
1479 .rdev_size_change = super_1_rdev_size_change,
1480 },
1481 };
1482
1483 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1484 {
1485 mdk_rdev_t *rdev, *rdev2;
1486
1487 rcu_read_lock();
1488 rdev_for_each_rcu(rdev, mddev1)
1489 rdev_for_each_rcu(rdev2, mddev2)
1490 if (rdev->bdev->bd_contains ==
1491 rdev2->bdev->bd_contains) {
1492 rcu_read_unlock();
1493 return 1;
1494 }
1495 rcu_read_unlock();
1496 return 0;
1497 }
1498
1499 static LIST_HEAD(pending_raid_disks);
1500
1501 /*
1502 * Try to register data integrity profile for an mddev
1503 *
1504 * This is called when an array is started and after a disk has been kicked
1505 * from the array. It only succeeds if all working and active component devices
1506 * are integrity capable with matching profiles.
1507 */
1508 int md_integrity_register(mddev_t *mddev)
1509 {
1510 mdk_rdev_t *rdev, *reference = NULL;
1511
1512 if (list_empty(&mddev->disks))
1513 return 0; /* nothing to do */
1514 if (blk_get_integrity(mddev->gendisk))
1515 return 0; /* already registered */
1516 list_for_each_entry(rdev, &mddev->disks, same_set) {
1517 /* skip spares and non-functional disks */
1518 if (test_bit(Faulty, &rdev->flags))
1519 continue;
1520 if (rdev->raid_disk < 0)
1521 continue;
1522 /*
1523 * If at least one rdev is not integrity capable, we can not
1524 * enable data integrity for the md device.
1525 */
1526 if (!bdev_get_integrity(rdev->bdev))
1527 return -EINVAL;
1528 if (!reference) {
1529 /* Use the first rdev as the reference */
1530 reference = rdev;
1531 continue;
1532 }
1533 /* does this rdev's profile match the reference profile? */
1534 if (blk_integrity_compare(reference->bdev->bd_disk,
1535 rdev->bdev->bd_disk) < 0)
1536 return -EINVAL;
1537 }
1538 /*
1539 * All component devices are integrity capable and have matching
1540 * profiles, register the common profile for the md device.
1541 */
1542 if (blk_integrity_register(mddev->gendisk,
1543 bdev_get_integrity(reference->bdev)) != 0) {
1544 printk(KERN_ERR "md: failed to register integrity for %s\n",
1545 mdname(mddev));
1546 return -EINVAL;
1547 }
1548 printk(KERN_NOTICE "md: data integrity on %s enabled\n",
1549 mdname(mddev));
1550 return 0;
1551 }
1552 EXPORT_SYMBOL(md_integrity_register);
1553
1554 /* Disable data integrity if non-capable/non-matching disk is being added */
1555 void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
1556 {
1557 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1558 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
1559
1560 if (!bi_mddev) /* nothing to do */
1561 return;
1562 if (rdev->raid_disk < 0) /* skip spares */
1563 return;
1564 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1565 rdev->bdev->bd_disk) >= 0)
1566 return;
1567 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
1568 blk_integrity_unregister(mddev->gendisk);
1569 }
1570 EXPORT_SYMBOL(md_integrity_add_rdev);
1571
1572 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1573 {
1574 char b[BDEVNAME_SIZE];
1575 struct kobject *ko;
1576 char *s;
1577 int err;
1578
1579 if (rdev->mddev) {
1580 MD_BUG();
1581 return -EINVAL;
1582 }
1583
1584 /* prevent duplicates */
1585 if (find_rdev(mddev, rdev->bdev->bd_dev))
1586 return -EEXIST;
1587
1588 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1589 if (rdev->sectors && (mddev->dev_sectors == 0 ||
1590 rdev->sectors < mddev->dev_sectors)) {
1591 if (mddev->pers) {
1592 /* Cannot change size, so fail
1593 * If mddev->level <= 0, then we don't care
1594 * about aligning sizes (e.g. linear)
1595 */
1596 if (mddev->level > 0)
1597 return -ENOSPC;
1598 } else
1599 mddev->dev_sectors = rdev->sectors;
1600 }
1601
1602 /* Verify rdev->desc_nr is unique.
1603 * If it is -1, assign a free number, else
1604 * check number is not in use
1605 */
1606 if (rdev->desc_nr < 0) {
1607 int choice = 0;
1608 if (mddev->pers) choice = mddev->raid_disks;
1609 while (find_rdev_nr(mddev, choice))
1610 choice++;
1611 rdev->desc_nr = choice;
1612 } else {
1613 if (find_rdev_nr(mddev, rdev->desc_nr))
1614 return -EBUSY;
1615 }
1616 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1617 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1618 mdname(mddev), mddev->max_disks);
1619 return -EBUSY;
1620 }
1621 bdevname(rdev->bdev,b);
1622 while ( (s=strchr(b, '/')) != NULL)
1623 *s = '!';
1624
1625 rdev->mddev = mddev;
1626 printk(KERN_INFO "md: bind<%s>\n", b);
1627
1628 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1629 goto fail;
1630
1631 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1632 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1633 kobject_del(&rdev->kobj);
1634 goto fail;
1635 }
1636 rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state");
1637
1638 list_add_rcu(&rdev->same_set, &mddev->disks);
1639 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1640
1641 /* May as well allow recovery to be retried once */
1642 mddev->recovery_disabled = 0;
1643
1644 return 0;
1645
1646 fail:
1647 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1648 b, mdname(mddev));
1649 return err;
1650 }
1651
1652 static void md_delayed_delete(struct work_struct *ws)
1653 {
1654 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1655 kobject_del(&rdev->kobj);
1656 kobject_put(&rdev->kobj);
1657 }
1658
1659 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1660 {
1661 char b[BDEVNAME_SIZE];
1662 if (!rdev->mddev) {
1663 MD_BUG();
1664 return;
1665 }
1666 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1667 list_del_rcu(&rdev->same_set);
1668 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1669 rdev->mddev = NULL;
1670 sysfs_remove_link(&rdev->kobj, "block");
1671 sysfs_put(rdev->sysfs_state);
1672 rdev->sysfs_state = NULL;
1673 /* We need to delay this, otherwise we can deadlock when
1674 * writing to 'remove' to "dev/state". We also need
1675 * to delay it due to rcu usage.
1676 */
1677 synchronize_rcu();
1678 INIT_WORK(&rdev->del_work, md_delayed_delete);
1679 kobject_get(&rdev->kobj);
1680 schedule_work(&rdev->del_work);
1681 }
1682
1683 /*
1684 * prevent the device from being mounted, repartitioned or
1685 * otherwise reused by a RAID array (or any other kernel
1686 * subsystem), by bd_claiming the device.
1687 */
1688 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1689 {
1690 int err = 0;
1691 struct block_device *bdev;
1692 char b[BDEVNAME_SIZE];
1693
1694 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1695 if (IS_ERR(bdev)) {
1696 printk(KERN_ERR "md: could not open %s.\n",
1697 __bdevname(dev, b));
1698 return PTR_ERR(bdev);
1699 }
1700 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1701 if (err) {
1702 printk(KERN_ERR "md: could not bd_claim %s.\n",
1703 bdevname(bdev, b));
1704 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1705 return err;
1706 }
1707 if (!shared)
1708 set_bit(AllReserved, &rdev->flags);
1709 rdev->bdev = bdev;
1710 return err;
1711 }
1712
1713 static void unlock_rdev(mdk_rdev_t *rdev)
1714 {
1715 struct block_device *bdev = rdev->bdev;
1716 rdev->bdev = NULL;
1717 if (!bdev)
1718 MD_BUG();
1719 bd_release(bdev);
1720 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1721 }
1722
1723 void md_autodetect_dev(dev_t dev);
1724
1725 static void export_rdev(mdk_rdev_t * rdev)
1726 {
1727 char b[BDEVNAME_SIZE];
1728 printk(KERN_INFO "md: export_rdev(%s)\n",
1729 bdevname(rdev->bdev,b));
1730 if (rdev->mddev)
1731 MD_BUG();
1732 free_disk_sb(rdev);
1733 #ifndef MODULE
1734 if (test_bit(AutoDetected, &rdev->flags))
1735 md_autodetect_dev(rdev->bdev->bd_dev);
1736 #endif
1737 unlock_rdev(rdev);
1738 kobject_put(&rdev->kobj);
1739 }
1740
1741 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1742 {
1743 unbind_rdev_from_array(rdev);
1744 export_rdev(rdev);
1745 }
1746
1747 static void export_array(mddev_t *mddev)
1748 {
1749 mdk_rdev_t *rdev, *tmp;
1750
1751 rdev_for_each(rdev, tmp, mddev) {
1752 if (!rdev->mddev) {
1753 MD_BUG();
1754 continue;
1755 }
1756 kick_rdev_from_array(rdev);
1757 }
1758 if (!list_empty(&mddev->disks))
1759 MD_BUG();
1760 mddev->raid_disks = 0;
1761 mddev->major_version = 0;
1762 }
1763
1764 static void print_desc(mdp_disk_t *desc)
1765 {
1766 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1767 desc->major,desc->minor,desc->raid_disk,desc->state);
1768 }
1769
1770 static void print_sb_90(mdp_super_t *sb)
1771 {
1772 int i;
1773
1774 printk(KERN_INFO
1775 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1776 sb->major_version, sb->minor_version, sb->patch_version,
1777 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1778 sb->ctime);
1779 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1780 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1781 sb->md_minor, sb->layout, sb->chunk_size);
1782 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1783 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1784 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1785 sb->failed_disks, sb->spare_disks,
1786 sb->sb_csum, (unsigned long)sb->events_lo);
1787
1788 printk(KERN_INFO);
1789 for (i = 0; i < MD_SB_DISKS; i++) {
1790 mdp_disk_t *desc;
1791
1792 desc = sb->disks + i;
1793 if (desc->number || desc->major || desc->minor ||
1794 desc->raid_disk || (desc->state && (desc->state != 4))) {
1795 printk(" D %2d: ", i);
1796 print_desc(desc);
1797 }
1798 }
1799 printk(KERN_INFO "md: THIS: ");
1800 print_desc(&sb->this_disk);
1801 }
1802
1803 static void print_sb_1(struct mdp_superblock_1 *sb)
1804 {
1805 __u8 *uuid;
1806
1807 uuid = sb->set_uuid;
1808 printk(KERN_INFO
1809 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x"
1810 ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n"
1811 "md: Name: \"%s\" CT:%llu\n",
1812 le32_to_cpu(sb->major_version),
1813 le32_to_cpu(sb->feature_map),
1814 uuid[0], uuid[1], uuid[2], uuid[3],
1815 uuid[4], uuid[5], uuid[6], uuid[7],
1816 uuid[8], uuid[9], uuid[10], uuid[11],
1817 uuid[12], uuid[13], uuid[14], uuid[15],
1818 sb->set_name,
1819 (unsigned long long)le64_to_cpu(sb->ctime)
1820 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
1821
1822 uuid = sb->device_uuid;
1823 printk(KERN_INFO
1824 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1825 " RO:%llu\n"
1826 "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x"
1827 ":%02x%02x%02x%02x%02x%02x\n"
1828 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1829 "md: (MaxDev:%u) \n",
1830 le32_to_cpu(sb->level),
1831 (unsigned long long)le64_to_cpu(sb->size),
1832 le32_to_cpu(sb->raid_disks),
1833 le32_to_cpu(sb->layout),
1834 le32_to_cpu(sb->chunksize),
1835 (unsigned long long)le64_to_cpu(sb->data_offset),
1836 (unsigned long long)le64_to_cpu(sb->data_size),
1837 (unsigned long long)le64_to_cpu(sb->super_offset),
1838 (unsigned long long)le64_to_cpu(sb->recovery_offset),
1839 le32_to_cpu(sb->dev_number),
1840 uuid[0], uuid[1], uuid[2], uuid[3],
1841 uuid[4], uuid[5], uuid[6], uuid[7],
1842 uuid[8], uuid[9], uuid[10], uuid[11],
1843 uuid[12], uuid[13], uuid[14], uuid[15],
1844 sb->devflags,
1845 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
1846 (unsigned long long)le64_to_cpu(sb->events),
1847 (unsigned long long)le64_to_cpu(sb->resync_offset),
1848 le32_to_cpu(sb->sb_csum),
1849 le32_to_cpu(sb->max_dev)
1850 );
1851 }
1852
1853 static void print_rdev(mdk_rdev_t *rdev, int major_version)
1854 {
1855 char b[BDEVNAME_SIZE];
1856 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
1857 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
1858 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1859 rdev->desc_nr);
1860 if (rdev->sb_loaded) {
1861 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
1862 switch (major_version) {
1863 case 0:
1864 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
1865 break;
1866 case 1:
1867 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
1868 break;
1869 }
1870 } else
1871 printk(KERN_INFO "md: no rdev superblock!\n");
1872 }
1873
1874 static void md_print_devices(void)
1875 {
1876 struct list_head *tmp;
1877 mdk_rdev_t *rdev;
1878 mddev_t *mddev;
1879 char b[BDEVNAME_SIZE];
1880
1881 printk("\n");
1882 printk("md: **********************************\n");
1883 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1884 printk("md: **********************************\n");
1885 for_each_mddev(mddev, tmp) {
1886
1887 if (mddev->bitmap)
1888 bitmap_print_sb(mddev->bitmap);
1889 else
1890 printk("%s: ", mdname(mddev));
1891 list_for_each_entry(rdev, &mddev->disks, same_set)
1892 printk("<%s>", bdevname(rdev->bdev,b));
1893 printk("\n");
1894
1895 list_for_each_entry(rdev, &mddev->disks, same_set)
1896 print_rdev(rdev, mddev->major_version);
1897 }
1898 printk("md: **********************************\n");
1899 printk("\n");
1900 }
1901
1902
1903 static void sync_sbs(mddev_t * mddev, int nospares)
1904 {
1905 /* Update each superblock (in-memory image), but
1906 * if we are allowed to, skip spares which already
1907 * have the right event counter, or have one earlier
1908 * (which would mean they aren't being marked as dirty
1909 * with the rest of the array)
1910 */
1911 mdk_rdev_t *rdev;
1912
1913 list_for_each_entry(rdev, &mddev->disks, same_set) {
1914 if (rdev->sb_events == mddev->events ||
1915 (nospares &&
1916 rdev->raid_disk < 0 &&
1917 (rdev->sb_events&1)==0 &&
1918 rdev->sb_events+1 == mddev->events)) {
1919 /* Don't update this superblock */
1920 rdev->sb_loaded = 2;
1921 } else {
1922 super_types[mddev->major_version].
1923 sync_super(mddev, rdev);
1924 rdev->sb_loaded = 1;
1925 }
1926 }
1927 }
1928
1929 static void md_update_sb(mddev_t * mddev, int force_change)
1930 {
1931 mdk_rdev_t *rdev;
1932 int sync_req;
1933 int nospares = 0;
1934
1935 mddev->utime = get_seconds();
1936 if (mddev->external)
1937 return;
1938 repeat:
1939 spin_lock_irq(&mddev->write_lock);
1940
1941 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1942 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1943 force_change = 1;
1944 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1945 /* just a clean<-> dirty transition, possibly leave spares alone,
1946 * though if events isn't the right even/odd, we will have to do
1947 * spares after all
1948 */
1949 nospares = 1;
1950 if (force_change)
1951 nospares = 0;
1952 if (mddev->degraded)
1953 /* If the array is degraded, then skipping spares is both
1954 * dangerous and fairly pointless.
1955 * Dangerous because a device that was removed from the array
1956 * might have a event_count that still looks up-to-date,
1957 * so it can be re-added without a resync.
1958 * Pointless because if there are any spares to skip,
1959 * then a recovery will happen and soon that array won't
1960 * be degraded any more and the spare can go back to sleep then.
1961 */
1962 nospares = 0;
1963
1964 sync_req = mddev->in_sync;
1965
1966 /* If this is just a dirty<->clean transition, and the array is clean
1967 * and 'events' is odd, we can roll back to the previous clean state */
1968 if (nospares
1969 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1970 && (mddev->events & 1)
1971 && mddev->events != 1)
1972 mddev->events--;
1973 else {
1974 /* otherwise we have to go forward and ... */
1975 mddev->events ++;
1976 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1977 /* .. if the array isn't clean, insist on an odd 'events' */
1978 if ((mddev->events&1)==0) {
1979 mddev->events++;
1980 nospares = 0;
1981 }
1982 } else {
1983 /* otherwise insist on an even 'events' (for clean states) */
1984 if ((mddev->events&1)) {
1985 mddev->events++;
1986 nospares = 0;
1987 }
1988 }
1989 }
1990
1991 if (!mddev->events) {
1992 /*
1993 * oops, this 64-bit counter should never wrap.
1994 * Either we are in around ~1 trillion A.C., assuming
1995 * 1 reboot per second, or we have a bug:
1996 */
1997 MD_BUG();
1998 mddev->events --;
1999 }
2000
2001 /*
2002 * do not write anything to disk if using
2003 * nonpersistent superblocks
2004 */
2005 if (!mddev->persistent) {
2006 if (!mddev->external)
2007 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2008
2009 spin_unlock_irq(&mddev->write_lock);
2010 wake_up(&mddev->sb_wait);
2011 return;
2012 }
2013 sync_sbs(mddev, nospares);
2014 spin_unlock_irq(&mddev->write_lock);
2015
2016 dprintk(KERN_INFO
2017 "md: updating %s RAID superblock on device (in sync %d)\n",
2018 mdname(mddev),mddev->in_sync);
2019
2020 bitmap_update_sb(mddev->bitmap);
2021 list_for_each_entry(rdev, &mddev->disks, same_set) {
2022 char b[BDEVNAME_SIZE];
2023 dprintk(KERN_INFO "md: ");
2024 if (rdev->sb_loaded != 1)
2025 continue; /* no noise on spare devices */
2026 if (test_bit(Faulty, &rdev->flags))
2027 dprintk("(skipping faulty ");
2028
2029 dprintk("%s ", bdevname(rdev->bdev,b));
2030 if (!test_bit(Faulty, &rdev->flags)) {
2031 md_super_write(mddev,rdev,
2032 rdev->sb_start, rdev->sb_size,
2033 rdev->sb_page);
2034 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2035 bdevname(rdev->bdev,b),
2036 (unsigned long long)rdev->sb_start);
2037 rdev->sb_events = mddev->events;
2038
2039 } else
2040 dprintk(")\n");
2041 if (mddev->level == LEVEL_MULTIPATH)
2042 /* only need to write one superblock... */
2043 break;
2044 }
2045 md_super_wait(mddev);
2046 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2047
2048 spin_lock_irq(&mddev->write_lock);
2049 if (mddev->in_sync != sync_req ||
2050 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2051 /* have to write it out again */
2052 spin_unlock_irq(&mddev->write_lock);
2053 goto repeat;
2054 }
2055 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2056 spin_unlock_irq(&mddev->write_lock);
2057 wake_up(&mddev->sb_wait);
2058 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2059 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2060
2061 }
2062
2063 /* words written to sysfs files may, or may not, be \n terminated.
2064 * We want to accept with case. For this we use cmd_match.
2065 */
2066 static int cmd_match(const char *cmd, const char *str)
2067 {
2068 /* See if cmd, written into a sysfs file, matches
2069 * str. They must either be the same, or cmd can
2070 * have a trailing newline
2071 */
2072 while (*cmd && *str && *cmd == *str) {
2073 cmd++;
2074 str++;
2075 }
2076 if (*cmd == '\n')
2077 cmd++;
2078 if (*str || *cmd)
2079 return 0;
2080 return 1;
2081 }
2082
2083 struct rdev_sysfs_entry {
2084 struct attribute attr;
2085 ssize_t (*show)(mdk_rdev_t *, char *);
2086 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2087 };
2088
2089 static ssize_t
2090 state_show(mdk_rdev_t *rdev, char *page)
2091 {
2092 char *sep = "";
2093 size_t len = 0;
2094
2095 if (test_bit(Faulty, &rdev->flags)) {
2096 len+= sprintf(page+len, "%sfaulty",sep);
2097 sep = ",";
2098 }
2099 if (test_bit(In_sync, &rdev->flags)) {
2100 len += sprintf(page+len, "%sin_sync",sep);
2101 sep = ",";
2102 }
2103 if (test_bit(WriteMostly, &rdev->flags)) {
2104 len += sprintf(page+len, "%swrite_mostly",sep);
2105 sep = ",";
2106 }
2107 if (test_bit(Blocked, &rdev->flags)) {
2108 len += sprintf(page+len, "%sblocked", sep);
2109 sep = ",";
2110 }
2111 if (!test_bit(Faulty, &rdev->flags) &&
2112 !test_bit(In_sync, &rdev->flags)) {
2113 len += sprintf(page+len, "%sspare", sep);
2114 sep = ",";
2115 }
2116 return len+sprintf(page+len, "\n");
2117 }
2118
2119 static ssize_t
2120 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2121 {
2122 /* can write
2123 * faulty - simulates and error
2124 * remove - disconnects the device
2125 * writemostly - sets write_mostly
2126 * -writemostly - clears write_mostly
2127 * blocked - sets the Blocked flag
2128 * -blocked - clears the Blocked flag
2129 * insync - sets Insync providing device isn't active
2130 */
2131 int err = -EINVAL;
2132 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2133 md_error(rdev->mddev, rdev);
2134 err = 0;
2135 } else if (cmd_match(buf, "remove")) {
2136 if (rdev->raid_disk >= 0)
2137 err = -EBUSY;
2138 else {
2139 mddev_t *mddev = rdev->mddev;
2140 kick_rdev_from_array(rdev);
2141 if (mddev->pers)
2142 md_update_sb(mddev, 1);
2143 md_new_event(mddev);
2144 err = 0;
2145 }
2146 } else if (cmd_match(buf, "writemostly")) {
2147 set_bit(WriteMostly, &rdev->flags);
2148 err = 0;
2149 } else if (cmd_match(buf, "-writemostly")) {
2150 clear_bit(WriteMostly, &rdev->flags);
2151 err = 0;
2152 } else if (cmd_match(buf, "blocked")) {
2153 set_bit(Blocked, &rdev->flags);
2154 err = 0;
2155 } else if (cmd_match(buf, "-blocked")) {
2156 clear_bit(Blocked, &rdev->flags);
2157 wake_up(&rdev->blocked_wait);
2158 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2159 md_wakeup_thread(rdev->mddev->thread);
2160
2161 err = 0;
2162 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2163 set_bit(In_sync, &rdev->flags);
2164 err = 0;
2165 }
2166 if (!err && rdev->sysfs_state)
2167 sysfs_notify_dirent(rdev->sysfs_state);
2168 return err ? err : len;
2169 }
2170 static struct rdev_sysfs_entry rdev_state =
2171 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2172
2173 static ssize_t
2174 errors_show(mdk_rdev_t *rdev, char *page)
2175 {
2176 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2177 }
2178
2179 static ssize_t
2180 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2181 {
2182 char *e;
2183 unsigned long n = simple_strtoul(buf, &e, 10);
2184 if (*buf && (*e == 0 || *e == '\n')) {
2185 atomic_set(&rdev->corrected_errors, n);
2186 return len;
2187 }
2188 return -EINVAL;
2189 }
2190 static struct rdev_sysfs_entry rdev_errors =
2191 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2192
2193 static ssize_t
2194 slot_show(mdk_rdev_t *rdev, char *page)
2195 {
2196 if (rdev->raid_disk < 0)
2197 return sprintf(page, "none\n");
2198 else
2199 return sprintf(page, "%d\n", rdev->raid_disk);
2200 }
2201
2202 static ssize_t
2203 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2204 {
2205 char *e;
2206 int err;
2207 char nm[20];
2208 int slot = simple_strtoul(buf, &e, 10);
2209 if (strncmp(buf, "none", 4)==0)
2210 slot = -1;
2211 else if (e==buf || (*e && *e!= '\n'))
2212 return -EINVAL;
2213 if (rdev->mddev->pers && slot == -1) {
2214 /* Setting 'slot' on an active array requires also
2215 * updating the 'rd%d' link, and communicating
2216 * with the personality with ->hot_*_disk.
2217 * For now we only support removing
2218 * failed/spare devices. This normally happens automatically,
2219 * but not when the metadata is externally managed.
2220 */
2221 if (rdev->raid_disk == -1)
2222 return -EEXIST;
2223 /* personality does all needed checks */
2224 if (rdev->mddev->pers->hot_add_disk == NULL)
2225 return -EINVAL;
2226 err = rdev->mddev->pers->
2227 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2228 if (err)
2229 return err;
2230 sprintf(nm, "rd%d", rdev->raid_disk);
2231 sysfs_remove_link(&rdev->mddev->kobj, nm);
2232 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2233 md_wakeup_thread(rdev->mddev->thread);
2234 } else if (rdev->mddev->pers) {
2235 mdk_rdev_t *rdev2;
2236 /* Activating a spare .. or possibly reactivating
2237 * if we ever get bitmaps working here.
2238 */
2239
2240 if (rdev->raid_disk != -1)
2241 return -EBUSY;
2242
2243 if (rdev->mddev->pers->hot_add_disk == NULL)
2244 return -EINVAL;
2245
2246 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2247 if (rdev2->raid_disk == slot)
2248 return -EEXIST;
2249
2250 rdev->raid_disk = slot;
2251 if (test_bit(In_sync, &rdev->flags))
2252 rdev->saved_raid_disk = slot;
2253 else
2254 rdev->saved_raid_disk = -1;
2255 err = rdev->mddev->pers->
2256 hot_add_disk(rdev->mddev, rdev);
2257 if (err) {
2258 rdev->raid_disk = -1;
2259 return err;
2260 } else
2261 sysfs_notify_dirent(rdev->sysfs_state);
2262 sprintf(nm, "rd%d", rdev->raid_disk);
2263 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2264 printk(KERN_WARNING
2265 "md: cannot register "
2266 "%s for %s\n",
2267 nm, mdname(rdev->mddev));
2268
2269 /* don't wakeup anyone, leave that to userspace. */
2270 } else {
2271 if (slot >= rdev->mddev->raid_disks)
2272 return -ENOSPC;
2273 rdev->raid_disk = slot;
2274 /* assume it is working */
2275 clear_bit(Faulty, &rdev->flags);
2276 clear_bit(WriteMostly, &rdev->flags);
2277 set_bit(In_sync, &rdev->flags);
2278 sysfs_notify_dirent(rdev->sysfs_state);
2279 }
2280 return len;
2281 }
2282
2283
2284 static struct rdev_sysfs_entry rdev_slot =
2285 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2286
2287 static ssize_t
2288 offset_show(mdk_rdev_t *rdev, char *page)
2289 {
2290 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2291 }
2292
2293 static ssize_t
2294 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2295 {
2296 char *e;
2297 unsigned long long offset = simple_strtoull(buf, &e, 10);
2298 if (e==buf || (*e && *e != '\n'))
2299 return -EINVAL;
2300 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2301 return -EBUSY;
2302 if (rdev->sectors && rdev->mddev->external)
2303 /* Must set offset before size, so overlap checks
2304 * can be sane */
2305 return -EBUSY;
2306 rdev->data_offset = offset;
2307 return len;
2308 }
2309
2310 static struct rdev_sysfs_entry rdev_offset =
2311 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2312
2313 static ssize_t
2314 rdev_size_show(mdk_rdev_t *rdev, char *page)
2315 {
2316 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2317 }
2318
2319 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2320 {
2321 /* check if two start/length pairs overlap */
2322 if (s1+l1 <= s2)
2323 return 0;
2324 if (s2+l2 <= s1)
2325 return 0;
2326 return 1;
2327 }
2328
2329 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2330 {
2331 unsigned long long blocks;
2332 sector_t new;
2333
2334 if (strict_strtoull(buf, 10, &blocks) < 0)
2335 return -EINVAL;
2336
2337 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2338 return -EINVAL; /* sector conversion overflow */
2339
2340 new = blocks * 2;
2341 if (new != blocks * 2)
2342 return -EINVAL; /* unsigned long long to sector_t overflow */
2343
2344 *sectors = new;
2345 return 0;
2346 }
2347
2348 static ssize_t
2349 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2350 {
2351 mddev_t *my_mddev = rdev->mddev;
2352 sector_t oldsectors = rdev->sectors;
2353 sector_t sectors;
2354
2355 if (strict_blocks_to_sectors(buf, &sectors) < 0)
2356 return -EINVAL;
2357 if (my_mddev->pers && rdev->raid_disk >= 0) {
2358 if (my_mddev->persistent) {
2359 sectors = super_types[my_mddev->major_version].
2360 rdev_size_change(rdev, sectors);
2361 if (!sectors)
2362 return -EBUSY;
2363 } else if (!sectors)
2364 sectors = (rdev->bdev->bd_inode->i_size >> 9) -
2365 rdev->data_offset;
2366 }
2367 if (sectors < my_mddev->dev_sectors)
2368 return -EINVAL; /* component must fit device */
2369
2370 rdev->sectors = sectors;
2371 if (sectors > oldsectors && my_mddev->external) {
2372 /* need to check that all other rdevs with the same ->bdev
2373 * do not overlap. We need to unlock the mddev to avoid
2374 * a deadlock. We have already changed rdev->sectors, and if
2375 * we have to change it back, we will have the lock again.
2376 */
2377 mddev_t *mddev;
2378 int overlap = 0;
2379 struct list_head *tmp;
2380
2381 mddev_unlock(my_mddev);
2382 for_each_mddev(mddev, tmp) {
2383 mdk_rdev_t *rdev2;
2384
2385 mddev_lock(mddev);
2386 list_for_each_entry(rdev2, &mddev->disks, same_set)
2387 if (test_bit(AllReserved, &rdev2->flags) ||
2388 (rdev->bdev == rdev2->bdev &&
2389 rdev != rdev2 &&
2390 overlaps(rdev->data_offset, rdev->sectors,
2391 rdev2->data_offset,
2392 rdev2->sectors))) {
2393 overlap = 1;
2394 break;
2395 }
2396 mddev_unlock(mddev);
2397 if (overlap) {
2398 mddev_put(mddev);
2399 break;
2400 }
2401 }
2402 mddev_lock(my_mddev);
2403 if (overlap) {
2404 /* Someone else could have slipped in a size
2405 * change here, but doing so is just silly.
2406 * We put oldsectors back because we *know* it is
2407 * safe, and trust userspace not to race with
2408 * itself
2409 */
2410 rdev->sectors = oldsectors;
2411 return -EBUSY;
2412 }
2413 }
2414 return len;
2415 }
2416
2417 static struct rdev_sysfs_entry rdev_size =
2418 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2419
2420 static struct attribute *rdev_default_attrs[] = {
2421 &rdev_state.attr,
2422 &rdev_errors.attr,
2423 &rdev_slot.attr,
2424 &rdev_offset.attr,
2425 &rdev_size.attr,
2426 NULL,
2427 };
2428 static ssize_t
2429 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2430 {
2431 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2432 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2433 mddev_t *mddev = rdev->mddev;
2434 ssize_t rv;
2435
2436 if (!entry->show)
2437 return -EIO;
2438
2439 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2440 if (!rv) {
2441 if (rdev->mddev == NULL)
2442 rv = -EBUSY;
2443 else
2444 rv = entry->show(rdev, page);
2445 mddev_unlock(mddev);
2446 }
2447 return rv;
2448 }
2449
2450 static ssize_t
2451 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2452 const char *page, size_t length)
2453 {
2454 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2455 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2456 ssize_t rv;
2457 mddev_t *mddev = rdev->mddev;
2458
2459 if (!entry->store)
2460 return -EIO;
2461 if (!capable(CAP_SYS_ADMIN))
2462 return -EACCES;
2463 rv = mddev ? mddev_lock(mddev): -EBUSY;
2464 if (!rv) {
2465 if (rdev->mddev == NULL)
2466 rv = -EBUSY;
2467 else
2468 rv = entry->store(rdev, page, length);
2469 mddev_unlock(mddev);
2470 }
2471 return rv;
2472 }
2473
2474 static void rdev_free(struct kobject *ko)
2475 {
2476 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2477 kfree(rdev);
2478 }
2479 static struct sysfs_ops rdev_sysfs_ops = {
2480 .show = rdev_attr_show,
2481 .store = rdev_attr_store,
2482 };
2483 static struct kobj_type rdev_ktype = {
2484 .release = rdev_free,
2485 .sysfs_ops = &rdev_sysfs_ops,
2486 .default_attrs = rdev_default_attrs,
2487 };
2488
2489 /*
2490 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2491 *
2492 * mark the device faulty if:
2493 *
2494 * - the device is nonexistent (zero size)
2495 * - the device has no valid superblock
2496 *
2497 * a faulty rdev _never_ has rdev->sb set.
2498 */
2499 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2500 {
2501 char b[BDEVNAME_SIZE];
2502 int err;
2503 mdk_rdev_t *rdev;
2504 sector_t size;
2505
2506 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2507 if (!rdev) {
2508 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2509 return ERR_PTR(-ENOMEM);
2510 }
2511
2512 if ((err = alloc_disk_sb(rdev)))
2513 goto abort_free;
2514
2515 err = lock_rdev(rdev, newdev, super_format == -2);
2516 if (err)
2517 goto abort_free;
2518
2519 kobject_init(&rdev->kobj, &rdev_ktype);
2520
2521 rdev->desc_nr = -1;
2522 rdev->saved_raid_disk = -1;
2523 rdev->raid_disk = -1;
2524 rdev->flags = 0;
2525 rdev->data_offset = 0;
2526 rdev->sb_events = 0;
2527 atomic_set(&rdev->nr_pending, 0);
2528 atomic_set(&rdev->read_errors, 0);
2529 atomic_set(&rdev->corrected_errors, 0);
2530
2531 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2532 if (!size) {
2533 printk(KERN_WARNING
2534 "md: %s has zero or unknown size, marking faulty!\n",
2535 bdevname(rdev->bdev,b));
2536 err = -EINVAL;
2537 goto abort_free;
2538 }
2539
2540 if (super_format >= 0) {
2541 err = super_types[super_format].
2542 load_super(rdev, NULL, super_minor);
2543 if (err == -EINVAL) {
2544 printk(KERN_WARNING
2545 "md: %s does not have a valid v%d.%d "
2546 "superblock, not importing!\n",
2547 bdevname(rdev->bdev,b),
2548 super_format, super_minor);
2549 goto abort_free;
2550 }
2551 if (err < 0) {
2552 printk(KERN_WARNING
2553 "md: could not read %s's sb, not importing!\n",
2554 bdevname(rdev->bdev,b));
2555 goto abort_free;
2556 }
2557 }
2558
2559 INIT_LIST_HEAD(&rdev->same_set);
2560 init_waitqueue_head(&rdev->blocked_wait);
2561
2562 return rdev;
2563
2564 abort_free:
2565 if (rdev->sb_page) {
2566 if (rdev->bdev)
2567 unlock_rdev(rdev);
2568 free_disk_sb(rdev);
2569 }
2570 kfree(rdev);
2571 return ERR_PTR(err);
2572 }
2573
2574 /*
2575 * Check a full RAID array for plausibility
2576 */
2577
2578
2579 static void analyze_sbs(mddev_t * mddev)
2580 {
2581 int i;
2582 mdk_rdev_t *rdev, *freshest, *tmp;
2583 char b[BDEVNAME_SIZE];
2584
2585 freshest = NULL;
2586 rdev_for_each(rdev, tmp, mddev)
2587 switch (super_types[mddev->major_version].
2588 load_super(rdev, freshest, mddev->minor_version)) {
2589 case 1:
2590 freshest = rdev;
2591 break;
2592 case 0:
2593 break;
2594 default:
2595 printk( KERN_ERR \
2596 "md: fatal superblock inconsistency in %s"
2597 " -- removing from array\n",
2598 bdevname(rdev->bdev,b));
2599 kick_rdev_from_array(rdev);
2600 }
2601
2602
2603 super_types[mddev->major_version].
2604 validate_super(mddev, freshest);
2605
2606 i = 0;
2607 rdev_for_each(rdev, tmp, mddev) {
2608 if (rdev->desc_nr >= mddev->max_disks ||
2609 i > mddev->max_disks) {
2610 printk(KERN_WARNING
2611 "md: %s: %s: only %d devices permitted\n",
2612 mdname(mddev), bdevname(rdev->bdev, b),
2613 mddev->max_disks);
2614 kick_rdev_from_array(rdev);
2615 continue;
2616 }
2617 if (rdev != freshest)
2618 if (super_types[mddev->major_version].
2619 validate_super(mddev, rdev)) {
2620 printk(KERN_WARNING "md: kicking non-fresh %s"
2621 " from array!\n",
2622 bdevname(rdev->bdev,b));
2623 kick_rdev_from_array(rdev);
2624 continue;
2625 }
2626 if (mddev->level == LEVEL_MULTIPATH) {
2627 rdev->desc_nr = i++;
2628 rdev->raid_disk = rdev->desc_nr;
2629 set_bit(In_sync, &rdev->flags);
2630 } else if (rdev->raid_disk >= mddev->raid_disks) {
2631 rdev->raid_disk = -1;
2632 clear_bit(In_sync, &rdev->flags);
2633 }
2634 }
2635 }
2636
2637 static void md_safemode_timeout(unsigned long data);
2638
2639 static ssize_t
2640 safe_delay_show(mddev_t *mddev, char *page)
2641 {
2642 int msec = (mddev->safemode_delay*1000)/HZ;
2643 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2644 }
2645 static ssize_t
2646 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2647 {
2648 int scale=1;
2649 int dot=0;
2650 int i;
2651 unsigned long msec;
2652 char buf[30];
2653
2654 /* remove a period, and count digits after it */
2655 if (len >= sizeof(buf))
2656 return -EINVAL;
2657 strlcpy(buf, cbuf, sizeof(buf));
2658 for (i=0; i<len; i++) {
2659 if (dot) {
2660 if (isdigit(buf[i])) {
2661 buf[i-1] = buf[i];
2662 scale *= 10;
2663 }
2664 buf[i] = 0;
2665 } else if (buf[i] == '.') {
2666 dot=1;
2667 buf[i] = 0;
2668 }
2669 }
2670 if (strict_strtoul(buf, 10, &msec) < 0)
2671 return -EINVAL;
2672 msec = (msec * 1000) / scale;
2673 if (msec == 0)
2674 mddev->safemode_delay = 0;
2675 else {
2676 unsigned long old_delay = mddev->safemode_delay;
2677 mddev->safemode_delay = (msec*HZ)/1000;
2678 if (mddev->safemode_delay == 0)
2679 mddev->safemode_delay = 1;
2680 if (mddev->safemode_delay < old_delay)
2681 md_safemode_timeout((unsigned long)mddev);
2682 }
2683 return len;
2684 }
2685 static struct md_sysfs_entry md_safe_delay =
2686 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2687
2688 static ssize_t
2689 level_show(mddev_t *mddev, char *page)
2690 {
2691 struct mdk_personality *p = mddev->pers;
2692 if (p)
2693 return sprintf(page, "%s\n", p->name);
2694 else if (mddev->clevel[0])
2695 return sprintf(page, "%s\n", mddev->clevel);
2696 else if (mddev->level != LEVEL_NONE)
2697 return sprintf(page, "%d\n", mddev->level);
2698 else
2699 return 0;
2700 }
2701
2702 static ssize_t
2703 level_store(mddev_t *mddev, const char *buf, size_t len)
2704 {
2705 char level[16];
2706 ssize_t rv = len;
2707 struct mdk_personality *pers;
2708 void *priv;
2709 mdk_rdev_t *rdev;
2710
2711 if (mddev->pers == NULL) {
2712 if (len == 0)
2713 return 0;
2714 if (len >= sizeof(mddev->clevel))
2715 return -ENOSPC;
2716 strncpy(mddev->clevel, buf, len);
2717 if (mddev->clevel[len-1] == '\n')
2718 len--;
2719 mddev->clevel[len] = 0;
2720 mddev->level = LEVEL_NONE;
2721 return rv;
2722 }
2723
2724 /* request to change the personality. Need to ensure:
2725 * - array is not engaged in resync/recovery/reshape
2726 * - old personality can be suspended
2727 * - new personality will access other array.
2728 */
2729
2730 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
2731 return -EBUSY;
2732
2733 if (!mddev->pers->quiesce) {
2734 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
2735 mdname(mddev), mddev->pers->name);
2736 return -EINVAL;
2737 }
2738
2739 /* Now find the new personality */
2740 if (len == 0 || len >= sizeof(level))
2741 return -EINVAL;
2742 strncpy(level, buf, len);
2743 if (level[len-1] == '\n')
2744 len--;
2745 level[len] = 0;
2746
2747 request_module("md-%s", level);
2748 spin_lock(&pers_lock);
2749 pers = find_pers(LEVEL_NONE, level);
2750 if (!pers || !try_module_get(pers->owner)) {
2751 spin_unlock(&pers_lock);
2752 printk(KERN_WARNING "md: personality %s not loaded\n", level);
2753 return -EINVAL;
2754 }
2755 spin_unlock(&pers_lock);
2756
2757 if (pers == mddev->pers) {
2758 /* Nothing to do! */
2759 module_put(pers->owner);
2760 return rv;
2761 }
2762 if (!pers->takeover) {
2763 module_put(pers->owner);
2764 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
2765 mdname(mddev), level);
2766 return -EINVAL;
2767 }
2768
2769 /* ->takeover must set new_* and/or delta_disks
2770 * if it succeeds, and may set them when it fails.
2771 */
2772 priv = pers->takeover(mddev);
2773 if (IS_ERR(priv)) {
2774 mddev->new_level = mddev->level;
2775 mddev->new_layout = mddev->layout;
2776 mddev->new_chunk_sectors = mddev->chunk_sectors;
2777 mddev->raid_disks -= mddev->delta_disks;
2778 mddev->delta_disks = 0;
2779 module_put(pers->owner);
2780 printk(KERN_WARNING "md: %s: %s would not accept array\n",
2781 mdname(mddev), level);
2782 return PTR_ERR(priv);
2783 }
2784
2785 /* Looks like we have a winner */
2786 mddev_suspend(mddev);
2787 mddev->pers->stop(mddev);
2788 module_put(mddev->pers->owner);
2789 /* Invalidate devices that are now superfluous */
2790 list_for_each_entry(rdev, &mddev->disks, same_set)
2791 if (rdev->raid_disk >= mddev->raid_disks) {
2792 rdev->raid_disk = -1;
2793 clear_bit(In_sync, &rdev->flags);
2794 }
2795 mddev->pers = pers;
2796 mddev->private = priv;
2797 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
2798 mddev->level = mddev->new_level;
2799 mddev->layout = mddev->new_layout;
2800 mddev->chunk_sectors = mddev->new_chunk_sectors;
2801 mddev->delta_disks = 0;
2802 pers->run(mddev);
2803 mddev_resume(mddev);
2804 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2805 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2806 md_wakeup_thread(mddev->thread);
2807 return rv;
2808 }
2809
2810 static struct md_sysfs_entry md_level =
2811 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2812
2813
2814 static ssize_t
2815 layout_show(mddev_t *mddev, char *page)
2816 {
2817 /* just a number, not meaningful for all levels */
2818 if (mddev->reshape_position != MaxSector &&
2819 mddev->layout != mddev->new_layout)
2820 return sprintf(page, "%d (%d)\n",
2821 mddev->new_layout, mddev->layout);
2822 return sprintf(page, "%d\n", mddev->layout);
2823 }
2824
2825 static ssize_t
2826 layout_store(mddev_t *mddev, const char *buf, size_t len)
2827 {
2828 char *e;
2829 unsigned long n = simple_strtoul(buf, &e, 10);
2830
2831 if (!*buf || (*e && *e != '\n'))
2832 return -EINVAL;
2833
2834 if (mddev->pers) {
2835 int err;
2836 if (mddev->pers->check_reshape == NULL)
2837 return -EBUSY;
2838 mddev->new_layout = n;
2839 err = mddev->pers->check_reshape(mddev);
2840 if (err) {
2841 mddev->new_layout = mddev->layout;
2842 return err;
2843 }
2844 } else {
2845 mddev->new_layout = n;
2846 if (mddev->reshape_position == MaxSector)
2847 mddev->layout = n;
2848 }
2849 return len;
2850 }
2851 static struct md_sysfs_entry md_layout =
2852 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2853
2854
2855 static ssize_t
2856 raid_disks_show(mddev_t *mddev, char *page)
2857 {
2858 if (mddev->raid_disks == 0)
2859 return 0;
2860 if (mddev->reshape_position != MaxSector &&
2861 mddev->delta_disks != 0)
2862 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2863 mddev->raid_disks - mddev->delta_disks);
2864 return sprintf(page, "%d\n", mddev->raid_disks);
2865 }
2866
2867 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2868
2869 static ssize_t
2870 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2871 {
2872 char *e;
2873 int rv = 0;
2874 unsigned long n = simple_strtoul(buf, &e, 10);
2875
2876 if (!*buf || (*e && *e != '\n'))
2877 return -EINVAL;
2878
2879 if (mddev->pers)
2880 rv = update_raid_disks(mddev, n);
2881 else if (mddev->reshape_position != MaxSector) {
2882 int olddisks = mddev->raid_disks - mddev->delta_disks;
2883 mddev->delta_disks = n - olddisks;
2884 mddev->raid_disks = n;
2885 } else
2886 mddev->raid_disks = n;
2887 return rv ? rv : len;
2888 }
2889 static struct md_sysfs_entry md_raid_disks =
2890 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2891
2892 static ssize_t
2893 chunk_size_show(mddev_t *mddev, char *page)
2894 {
2895 if (mddev->reshape_position != MaxSector &&
2896 mddev->chunk_sectors != mddev->new_chunk_sectors)
2897 return sprintf(page, "%d (%d)\n",
2898 mddev->new_chunk_sectors << 9,
2899 mddev->chunk_sectors << 9);
2900 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
2901 }
2902
2903 static ssize_t
2904 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2905 {
2906 char *e;
2907 unsigned long n = simple_strtoul(buf, &e, 10);
2908
2909 if (!*buf || (*e && *e != '\n'))
2910 return -EINVAL;
2911
2912 if (mddev->pers) {
2913 int err;
2914 if (mddev->pers->check_reshape == NULL)
2915 return -EBUSY;
2916 mddev->new_chunk_sectors = n >> 9;
2917 err = mddev->pers->check_reshape(mddev);
2918 if (err) {
2919 mddev->new_chunk_sectors = mddev->chunk_sectors;
2920 return err;
2921 }
2922 } else {
2923 mddev->new_chunk_sectors = n >> 9;
2924 if (mddev->reshape_position == MaxSector)
2925 mddev->chunk_sectors = n >> 9;
2926 }
2927 return len;
2928 }
2929 static struct md_sysfs_entry md_chunk_size =
2930 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2931
2932 static ssize_t
2933 resync_start_show(mddev_t *mddev, char *page)
2934 {
2935 if (mddev->recovery_cp == MaxSector)
2936 return sprintf(page, "none\n");
2937 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2938 }
2939
2940 static ssize_t
2941 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2942 {
2943 char *e;
2944 unsigned long long n = simple_strtoull(buf, &e, 10);
2945
2946 if (mddev->pers)
2947 return -EBUSY;
2948 if (!*buf || (*e && *e != '\n'))
2949 return -EINVAL;
2950
2951 mddev->recovery_cp = n;
2952 return len;
2953 }
2954 static struct md_sysfs_entry md_resync_start =
2955 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2956
2957 /*
2958 * The array state can be:
2959 *
2960 * clear
2961 * No devices, no size, no level
2962 * Equivalent to STOP_ARRAY ioctl
2963 * inactive
2964 * May have some settings, but array is not active
2965 * all IO results in error
2966 * When written, doesn't tear down array, but just stops it
2967 * suspended (not supported yet)
2968 * All IO requests will block. The array can be reconfigured.
2969 * Writing this, if accepted, will block until array is quiescent
2970 * readonly
2971 * no resync can happen. no superblocks get written.
2972 * write requests fail
2973 * read-auto
2974 * like readonly, but behaves like 'clean' on a write request.
2975 *
2976 * clean - no pending writes, but otherwise active.
2977 * When written to inactive array, starts without resync
2978 * If a write request arrives then
2979 * if metadata is known, mark 'dirty' and switch to 'active'.
2980 * if not known, block and switch to write-pending
2981 * If written to an active array that has pending writes, then fails.
2982 * active
2983 * fully active: IO and resync can be happening.
2984 * When written to inactive array, starts with resync
2985 *
2986 * write-pending
2987 * clean, but writes are blocked waiting for 'active' to be written.
2988 *
2989 * active-idle
2990 * like active, but no writes have been seen for a while (100msec).
2991 *
2992 */
2993 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2994 write_pending, active_idle, bad_word};
2995 static char *array_states[] = {
2996 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2997 "write-pending", "active-idle", NULL };
2998
2999 static int match_word(const char *word, char **list)
3000 {
3001 int n;
3002 for (n=0; list[n]; n++)
3003 if (cmd_match(word, list[n]))
3004 break;
3005 return n;
3006 }
3007
3008 static ssize_t
3009 array_state_show(mddev_t *mddev, char *page)
3010 {
3011 enum array_state st = inactive;
3012
3013 if (mddev->pers)
3014 switch(mddev->ro) {
3015 case 1:
3016 st = readonly;
3017 break;
3018 case 2:
3019 st = read_auto;
3020 break;
3021 case 0:
3022 if (mddev->in_sync)
3023 st = clean;
3024 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
3025 st = write_pending;
3026 else if (mddev->safemode)
3027 st = active_idle;
3028 else
3029 st = active;
3030 }
3031 else {
3032 if (list_empty(&mddev->disks) &&
3033 mddev->raid_disks == 0 &&
3034 mddev->dev_sectors == 0)
3035 st = clear;
3036 else
3037 st = inactive;
3038 }
3039 return sprintf(page, "%s\n", array_states[st]);
3040 }
3041
3042 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
3043 static int do_md_run(mddev_t * mddev);
3044 static int restart_array(mddev_t *mddev);
3045
3046 static ssize_t
3047 array_state_store(mddev_t *mddev, const char *buf, size_t len)
3048 {
3049 int err = -EINVAL;
3050 enum array_state st = match_word(buf, array_states);
3051 switch(st) {
3052 case bad_word:
3053 break;
3054 case clear:
3055 /* stopping an active array */
3056 if (atomic_read(&mddev->openers) > 0)
3057 return -EBUSY;
3058 err = do_md_stop(mddev, 0, 0);
3059 break;
3060 case inactive:
3061 /* stopping an active array */
3062 if (mddev->pers) {
3063 if (atomic_read(&mddev->openers) > 0)
3064 return -EBUSY;
3065 err = do_md_stop(mddev, 2, 0);
3066 } else
3067 err = 0; /* already inactive */
3068 break;
3069 case suspended:
3070 break; /* not supported yet */
3071 case readonly:
3072 if (mddev->pers)
3073 err = do_md_stop(mddev, 1, 0);
3074 else {
3075 mddev->ro = 1;
3076 set_disk_ro(mddev->gendisk, 1);
3077 err = do_md_run(mddev);
3078 }
3079 break;
3080 case read_auto:
3081 if (mddev->pers) {
3082 if (mddev->ro == 0)
3083 err = do_md_stop(mddev, 1, 0);
3084 else if (mddev->ro == 1)
3085 err = restart_array(mddev);
3086 if (err == 0) {
3087 mddev->ro = 2;
3088 set_disk_ro(mddev->gendisk, 0);
3089 }
3090 } else {
3091 mddev->ro = 2;
3092 err = do_md_run(mddev);
3093 }
3094 break;
3095 case clean:
3096 if (mddev->pers) {
3097 restart_array(mddev);
3098 spin_lock_irq(&mddev->write_lock);
3099 if (atomic_read(&mddev->writes_pending) == 0) {
3100 if (mddev->in_sync == 0) {
3101 mddev->in_sync = 1;
3102 if (mddev->safemode == 1)
3103 mddev->safemode = 0;
3104 if (mddev->persistent)
3105 set_bit(MD_CHANGE_CLEAN,
3106 &mddev->flags);
3107 }
3108 err = 0;
3109 } else
3110 err = -EBUSY;
3111 spin_unlock_irq(&mddev->write_lock);
3112 } else
3113 err = -EINVAL;
3114 break;
3115 case active:
3116 if (mddev->pers) {
3117 restart_array(mddev);
3118 if (mddev->external)
3119 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
3120 wake_up(&mddev->sb_wait);
3121 err = 0;
3122 } else {
3123 mddev->ro = 0;
3124 set_disk_ro(mddev->gendisk, 0);
3125 err = do_md_run(mddev);
3126 }
3127 break;
3128 case write_pending:
3129 case active_idle:
3130 /* these cannot be set */
3131 break;
3132 }
3133 if (err)
3134 return err;
3135 else {
3136 sysfs_notify_dirent(mddev->sysfs_state);
3137 return len;
3138 }
3139 }
3140 static struct md_sysfs_entry md_array_state =
3141 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3142
3143 static ssize_t
3144 null_show(mddev_t *mddev, char *page)
3145 {
3146 return -EINVAL;
3147 }
3148
3149 static ssize_t
3150 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3151 {
3152 /* buf must be %d:%d\n? giving major and minor numbers */
3153 /* The new device is added to the array.
3154 * If the array has a persistent superblock, we read the
3155 * superblock to initialise info and check validity.
3156 * Otherwise, only checking done is that in bind_rdev_to_array,
3157 * which mainly checks size.
3158 */
3159 char *e;
3160 int major = simple_strtoul(buf, &e, 10);
3161 int minor;
3162 dev_t dev;
3163 mdk_rdev_t *rdev;
3164 int err;
3165
3166 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3167 return -EINVAL;
3168 minor = simple_strtoul(e+1, &e, 10);
3169 if (*e && *e != '\n')
3170 return -EINVAL;
3171 dev = MKDEV(major, minor);
3172 if (major != MAJOR(dev) ||
3173 minor != MINOR(dev))
3174 return -EOVERFLOW;
3175
3176
3177 if (mddev->persistent) {
3178 rdev = md_import_device(dev, mddev->major_version,
3179 mddev->minor_version);
3180 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3181 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3182 mdk_rdev_t, same_set);
3183 err = super_types[mddev->major_version]
3184 .load_super(rdev, rdev0, mddev->minor_version);
3185 if (err < 0)
3186 goto out;
3187 }
3188 } else if (mddev->external)
3189 rdev = md_import_device(dev, -2, -1);
3190 else
3191 rdev = md_import_device(dev, -1, -1);
3192
3193 if (IS_ERR(rdev))
3194 return PTR_ERR(rdev);
3195 err = bind_rdev_to_array(rdev, mddev);
3196 out:
3197 if (err)
3198 export_rdev(rdev);
3199 return err ? err : len;
3200 }
3201
3202 static struct md_sysfs_entry md_new_device =
3203 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3204
3205 static ssize_t
3206 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3207 {
3208 char *end;
3209 unsigned long chunk, end_chunk;
3210
3211 if (!mddev->bitmap)
3212 goto out;
3213 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3214 while (*buf) {
3215 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3216 if (buf == end) break;
3217 if (*end == '-') { /* range */
3218 buf = end + 1;
3219 end_chunk = simple_strtoul(buf, &end, 0);
3220 if (buf == end) break;
3221 }
3222 if (*end && !isspace(*end)) break;
3223 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3224 buf = end;
3225 while (isspace(*buf)) buf++;
3226 }
3227 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3228 out:
3229 return len;
3230 }
3231
3232 static struct md_sysfs_entry md_bitmap =
3233 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3234
3235 static ssize_t
3236 size_show(mddev_t *mddev, char *page)
3237 {
3238 return sprintf(page, "%llu\n",
3239 (unsigned long long)mddev->dev_sectors / 2);
3240 }
3241
3242 static int update_size(mddev_t *mddev, sector_t num_sectors);
3243
3244 static ssize_t
3245 size_store(mddev_t *mddev, const char *buf, size_t len)
3246 {
3247 /* If array is inactive, we can reduce the component size, but
3248 * not increase it (except from 0).
3249 * If array is active, we can try an on-line resize
3250 */
3251 sector_t sectors;
3252 int err = strict_blocks_to_sectors(buf, &sectors);
3253
3254 if (err < 0)
3255 return err;
3256 if (mddev->pers) {
3257 err = update_size(mddev, sectors);
3258 md_update_sb(mddev, 1);
3259 } else {
3260 if (mddev->dev_sectors == 0 ||
3261 mddev->dev_sectors > sectors)
3262 mddev->dev_sectors = sectors;
3263 else
3264 err = -ENOSPC;
3265 }
3266 return err ? err : len;
3267 }
3268
3269 static struct md_sysfs_entry md_size =
3270 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3271
3272
3273 /* Metdata version.
3274 * This is one of
3275 * 'none' for arrays with no metadata (good luck...)
3276 * 'external' for arrays with externally managed metadata,
3277 * or N.M for internally known formats
3278 */
3279 static ssize_t
3280 metadata_show(mddev_t *mddev, char *page)
3281 {
3282 if (mddev->persistent)
3283 return sprintf(page, "%d.%d\n",
3284 mddev->major_version, mddev->minor_version);
3285 else if (mddev->external)
3286 return sprintf(page, "external:%s\n", mddev->metadata_type);
3287 else
3288 return sprintf(page, "none\n");
3289 }
3290
3291 static ssize_t
3292 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3293 {
3294 int major, minor;
3295 char *e;
3296 /* Changing the details of 'external' metadata is
3297 * always permitted. Otherwise there must be
3298 * no devices attached to the array.
3299 */
3300 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3301 ;
3302 else if (!list_empty(&mddev->disks))
3303 return -EBUSY;
3304
3305 if (cmd_match(buf, "none")) {
3306 mddev->persistent = 0;
3307 mddev->external = 0;
3308 mddev->major_version = 0;
3309 mddev->minor_version = 90;
3310 return len;
3311 }
3312 if (strncmp(buf, "external:", 9) == 0) {
3313 size_t namelen = len-9;
3314 if (namelen >= sizeof(mddev->metadata_type))
3315 namelen = sizeof(mddev->metadata_type)-1;
3316 strncpy(mddev->metadata_type, buf+9, namelen);
3317 mddev->metadata_type[namelen] = 0;
3318 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3319 mddev->metadata_type[--namelen] = 0;
3320 mddev->persistent = 0;
3321 mddev->external = 1;
3322 mddev->major_version = 0;
3323 mddev->minor_version = 90;
3324 return len;
3325 }
3326 major = simple_strtoul(buf, &e, 10);
3327 if (e==buf || *e != '.')
3328 return -EINVAL;
3329 buf = e+1;
3330 minor = simple_strtoul(buf, &e, 10);
3331 if (e==buf || (*e && *e != '\n') )
3332 return -EINVAL;
3333 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3334 return -ENOENT;
3335 mddev->major_version = major;
3336 mddev->minor_version = minor;
3337 mddev->persistent = 1;
3338 mddev->external = 0;
3339 return len;
3340 }
3341
3342 static struct md_sysfs_entry md_metadata =
3343 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3344
3345 static ssize_t
3346 action_show(mddev_t *mddev, char *page)
3347 {
3348 char *type = "idle";
3349 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3350 type = "frozen";
3351 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3352 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3353 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3354 type = "reshape";
3355 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3356 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3357 type = "resync";
3358 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3359 type = "check";
3360 else
3361 type = "repair";
3362 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3363 type = "recover";
3364 }
3365 return sprintf(page, "%s\n", type);
3366 }
3367
3368 static ssize_t
3369 action_store(mddev_t *mddev, const char *page, size_t len)
3370 {
3371 if (!mddev->pers || !mddev->pers->sync_request)
3372 return -EINVAL;
3373
3374 if (cmd_match(page, "frozen"))
3375 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3376 else
3377 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3378
3379 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
3380 if (mddev->sync_thread) {
3381 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3382 md_unregister_thread(mddev->sync_thread);
3383 mddev->sync_thread = NULL;
3384 mddev->recovery = 0;
3385 }
3386 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3387 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3388 return -EBUSY;
3389 else if (cmd_match(page, "resync"))
3390 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3391 else if (cmd_match(page, "recover")) {
3392 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3393 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3394 } else if (cmd_match(page, "reshape")) {
3395 int err;
3396 if (mddev->pers->start_reshape == NULL)
3397 return -EINVAL;
3398 err = mddev->pers->start_reshape(mddev);
3399 if (err)
3400 return err;
3401 sysfs_notify(&mddev->kobj, NULL, "degraded");
3402 } else {
3403 if (cmd_match(page, "check"))
3404 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3405 else if (!cmd_match(page, "repair"))
3406 return -EINVAL;
3407 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3408 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3409 }
3410 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3411 md_wakeup_thread(mddev->thread);
3412 sysfs_notify_dirent(mddev->sysfs_action);
3413 return len;
3414 }
3415
3416 static ssize_t
3417 mismatch_cnt_show(mddev_t *mddev, char *page)
3418 {
3419 return sprintf(page, "%llu\n",
3420 (unsigned long long) mddev->resync_mismatches);
3421 }
3422
3423 static struct md_sysfs_entry md_scan_mode =
3424 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3425
3426
3427 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3428
3429 static ssize_t
3430 sync_min_show(mddev_t *mddev, char *page)
3431 {
3432 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3433 mddev->sync_speed_min ? "local": "system");
3434 }
3435
3436 static ssize_t
3437 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3438 {
3439 int min;
3440 char *e;
3441 if (strncmp(buf, "system", 6)==0) {
3442 mddev->sync_speed_min = 0;
3443 return len;
3444 }
3445 min = simple_strtoul(buf, &e, 10);
3446 if (buf == e || (*e && *e != '\n') || min <= 0)
3447 return -EINVAL;
3448 mddev->sync_speed_min = min;
3449 return len;
3450 }
3451
3452 static struct md_sysfs_entry md_sync_min =
3453 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3454
3455 static ssize_t
3456 sync_max_show(mddev_t *mddev, char *page)
3457 {
3458 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3459 mddev->sync_speed_max ? "local": "system");
3460 }
3461
3462 static ssize_t
3463 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3464 {
3465 int max;
3466 char *e;
3467 if (strncmp(buf, "system", 6)==0) {
3468 mddev->sync_speed_max = 0;
3469 return len;
3470 }
3471 max = simple_strtoul(buf, &e, 10);
3472 if (buf == e || (*e && *e != '\n') || max <= 0)
3473 return -EINVAL;
3474 mddev->sync_speed_max = max;
3475 return len;
3476 }
3477
3478 static struct md_sysfs_entry md_sync_max =
3479 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3480
3481 static ssize_t
3482 degraded_show(mddev_t *mddev, char *page)
3483 {
3484 return sprintf(page, "%d\n", mddev->degraded);
3485 }
3486 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3487
3488 static ssize_t
3489 sync_force_parallel_show(mddev_t *mddev, char *page)
3490 {
3491 return sprintf(page, "%d\n", mddev->parallel_resync);
3492 }
3493
3494 static ssize_t
3495 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3496 {
3497 long n;
3498
3499 if (strict_strtol(buf, 10, &n))
3500 return -EINVAL;
3501
3502 if (n != 0 && n != 1)
3503 return -EINVAL;
3504
3505 mddev->parallel_resync = n;
3506
3507 if (mddev->sync_thread)
3508 wake_up(&resync_wait);
3509
3510 return len;
3511 }
3512
3513 /* force parallel resync, even with shared block devices */
3514 static struct md_sysfs_entry md_sync_force_parallel =
3515 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3516 sync_force_parallel_show, sync_force_parallel_store);
3517
3518 static ssize_t
3519 sync_speed_show(mddev_t *mddev, char *page)
3520 {
3521 unsigned long resync, dt, db;
3522 if (mddev->curr_resync == 0)
3523 return sprintf(page, "none\n");
3524 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3525 dt = (jiffies - mddev->resync_mark) / HZ;
3526 if (!dt) dt++;
3527 db = resync - mddev->resync_mark_cnt;
3528 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3529 }
3530
3531 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3532
3533 static ssize_t
3534 sync_completed_show(mddev_t *mddev, char *page)
3535 {
3536 unsigned long max_sectors, resync;
3537
3538 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3539 return sprintf(page, "none\n");
3540
3541 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3542 max_sectors = mddev->resync_max_sectors;
3543 else
3544 max_sectors = mddev->dev_sectors;
3545
3546 resync = mddev->curr_resync_completed;
3547 return sprintf(page, "%lu / %lu\n", resync, max_sectors);
3548 }
3549
3550 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3551
3552 static ssize_t
3553 min_sync_show(mddev_t *mddev, char *page)
3554 {
3555 return sprintf(page, "%llu\n",
3556 (unsigned long long)mddev->resync_min);
3557 }
3558 static ssize_t
3559 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3560 {
3561 unsigned long long min;
3562 if (strict_strtoull(buf, 10, &min))
3563 return -EINVAL;
3564 if (min > mddev->resync_max)
3565 return -EINVAL;
3566 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3567 return -EBUSY;
3568
3569 /* Must be a multiple of chunk_size */
3570 if (mddev->chunk_sectors) {
3571 sector_t temp = min;
3572 if (sector_div(temp, mddev->chunk_sectors))
3573 return -EINVAL;
3574 }
3575 mddev->resync_min = min;
3576
3577 return len;
3578 }
3579
3580 static struct md_sysfs_entry md_min_sync =
3581 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3582
3583 static ssize_t
3584 max_sync_show(mddev_t *mddev, char *page)
3585 {
3586 if (mddev->resync_max == MaxSector)
3587 return sprintf(page, "max\n");
3588 else
3589 return sprintf(page, "%llu\n",
3590 (unsigned long long)mddev->resync_max);
3591 }
3592 static ssize_t
3593 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3594 {
3595 if (strncmp(buf, "max", 3) == 0)
3596 mddev->resync_max = MaxSector;
3597 else {
3598 unsigned long long max;
3599 if (strict_strtoull(buf, 10, &max))
3600 return -EINVAL;
3601 if (max < mddev->resync_min)
3602 return -EINVAL;
3603 if (max < mddev->resync_max &&
3604 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3605 return -EBUSY;
3606
3607 /* Must be a multiple of chunk_size */
3608 if (mddev->chunk_sectors) {
3609 sector_t temp = max;
3610 if (sector_div(temp, mddev->chunk_sectors))
3611 return -EINVAL;
3612 }
3613 mddev->resync_max = max;
3614 }
3615 wake_up(&mddev->recovery_wait);
3616 return len;
3617 }
3618
3619 static struct md_sysfs_entry md_max_sync =
3620 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3621
3622 static ssize_t
3623 suspend_lo_show(mddev_t *mddev, char *page)
3624 {
3625 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3626 }
3627
3628 static ssize_t
3629 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3630 {
3631 char *e;
3632 unsigned long long new = simple_strtoull(buf, &e, 10);
3633
3634 if (mddev->pers == NULL ||
3635 mddev->pers->quiesce == NULL)
3636 return -EINVAL;
3637 if (buf == e || (*e && *e != '\n'))
3638 return -EINVAL;
3639 if (new >= mddev->suspend_hi ||
3640 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3641 mddev->suspend_lo = new;
3642 mddev->pers->quiesce(mddev, 2);
3643 return len;
3644 } else
3645 return -EINVAL;
3646 }
3647 static struct md_sysfs_entry md_suspend_lo =
3648 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3649
3650
3651 static ssize_t
3652 suspend_hi_show(mddev_t *mddev, char *page)
3653 {
3654 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3655 }
3656
3657 static ssize_t
3658 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3659 {
3660 char *e;
3661 unsigned long long new = simple_strtoull(buf, &e, 10);
3662
3663 if (mddev->pers == NULL ||
3664 mddev->pers->quiesce == NULL)
3665 return -EINVAL;
3666 if (buf == e || (*e && *e != '\n'))
3667 return -EINVAL;
3668 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3669 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3670 mddev->suspend_hi = new;
3671 mddev->pers->quiesce(mddev, 1);
3672 mddev->pers->quiesce(mddev, 0);
3673 return len;
3674 } else
3675 return -EINVAL;
3676 }
3677 static struct md_sysfs_entry md_suspend_hi =
3678 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3679
3680 static ssize_t
3681 reshape_position_show(mddev_t *mddev, char *page)
3682 {
3683 if (mddev->reshape_position != MaxSector)
3684 return sprintf(page, "%llu\n",
3685 (unsigned long long)mddev->reshape_position);
3686 strcpy(page, "none\n");
3687 return 5;
3688 }
3689
3690 static ssize_t
3691 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3692 {
3693 char *e;
3694 unsigned long long new = simple_strtoull(buf, &e, 10);
3695 if (mddev->pers)
3696 return -EBUSY;
3697 if (buf == e || (*e && *e != '\n'))
3698 return -EINVAL;
3699 mddev->reshape_position = new;
3700 mddev->delta_disks = 0;
3701 mddev->new_level = mddev->level;
3702 mddev->new_layout = mddev->layout;
3703 mddev->new_chunk_sectors = mddev->chunk_sectors;
3704 return len;
3705 }
3706
3707 static struct md_sysfs_entry md_reshape_position =
3708 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3709 reshape_position_store);
3710
3711 static ssize_t
3712 array_size_show(mddev_t *mddev, char *page)
3713 {
3714 if (mddev->external_size)
3715 return sprintf(page, "%llu\n",
3716 (unsigned long long)mddev->array_sectors/2);
3717 else
3718 return sprintf(page, "default\n");
3719 }
3720
3721 static ssize_t
3722 array_size_store(mddev_t *mddev, const char *buf, size_t len)
3723 {
3724 sector_t sectors;
3725
3726 if (strncmp(buf, "default", 7) == 0) {
3727 if (mddev->pers)
3728 sectors = mddev->pers->size(mddev, 0, 0);
3729 else
3730 sectors = mddev->array_sectors;
3731
3732 mddev->external_size = 0;
3733 } else {
3734 if (strict_blocks_to_sectors(buf, &sectors) < 0)
3735 return -EINVAL;
3736 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
3737 return -E2BIG;
3738
3739 mddev->external_size = 1;
3740 }
3741
3742 mddev->array_sectors = sectors;
3743 set_capacity(mddev->gendisk, mddev->array_sectors);
3744 if (mddev->pers)
3745 revalidate_disk(mddev->gendisk);
3746
3747 return len;
3748 }
3749
3750 static struct md_sysfs_entry md_array_size =
3751 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
3752 array_size_store);
3753
3754 static struct attribute *md_default_attrs[] = {
3755 &md_level.attr,
3756 &md_layout.attr,
3757 &md_raid_disks.attr,
3758 &md_chunk_size.attr,
3759 &md_size.attr,
3760 &md_resync_start.attr,
3761 &md_metadata.attr,
3762 &md_new_device.attr,
3763 &md_safe_delay.attr,
3764 &md_array_state.attr,
3765 &md_reshape_position.attr,
3766 &md_array_size.attr,
3767 NULL,
3768 };
3769
3770 static struct attribute *md_redundancy_attrs[] = {
3771 &md_scan_mode.attr,
3772 &md_mismatches.attr,
3773 &md_sync_min.attr,
3774 &md_sync_max.attr,
3775 &md_sync_speed.attr,
3776 &md_sync_force_parallel.attr,
3777 &md_sync_completed.attr,
3778 &md_min_sync.attr,
3779 &md_max_sync.attr,
3780 &md_suspend_lo.attr,
3781 &md_suspend_hi.attr,
3782 &md_bitmap.attr,
3783 &md_degraded.attr,
3784 NULL,
3785 };
3786 static struct attribute_group md_redundancy_group = {
3787 .name = NULL,
3788 .attrs = md_redundancy_attrs,
3789 };
3790
3791
3792 static ssize_t
3793 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3794 {
3795 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3796 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3797 ssize_t rv;
3798
3799 if (!entry->show)
3800 return -EIO;
3801 rv = mddev_lock(mddev);
3802 if (!rv) {
3803 rv = entry->show(mddev, page);
3804 mddev_unlock(mddev);
3805 }
3806 return rv;
3807 }
3808
3809 static ssize_t
3810 md_attr_store(struct kobject *kobj, struct attribute *attr,
3811 const char *page, size_t length)
3812 {
3813 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3814 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3815 ssize_t rv;
3816
3817 if (!entry->store)
3818 return -EIO;
3819 if (!capable(CAP_SYS_ADMIN))
3820 return -EACCES;
3821 rv = mddev_lock(mddev);
3822 if (mddev->hold_active == UNTIL_IOCTL)
3823 mddev->hold_active = 0;
3824 if (!rv) {
3825 rv = entry->store(mddev, page, length);
3826 mddev_unlock(mddev);
3827 }
3828 return rv;
3829 }
3830
3831 static void md_free(struct kobject *ko)
3832 {
3833 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3834
3835 if (mddev->sysfs_state)
3836 sysfs_put(mddev->sysfs_state);
3837
3838 if (mddev->gendisk) {
3839 del_gendisk(mddev->gendisk);
3840 put_disk(mddev->gendisk);
3841 }
3842 if (mddev->queue)
3843 blk_cleanup_queue(mddev->queue);
3844
3845 kfree(mddev);
3846 }
3847
3848 static struct sysfs_ops md_sysfs_ops = {
3849 .show = md_attr_show,
3850 .store = md_attr_store,
3851 };
3852 static struct kobj_type md_ktype = {
3853 .release = md_free,
3854 .sysfs_ops = &md_sysfs_ops,
3855 .default_attrs = md_default_attrs,
3856 };
3857
3858 int mdp_major = 0;
3859
3860 static void mddev_delayed_delete(struct work_struct *ws)
3861 {
3862 mddev_t *mddev = container_of(ws, mddev_t, del_work);
3863
3864 if (mddev->private == &md_redundancy_group) {
3865 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3866 if (mddev->sysfs_action)
3867 sysfs_put(mddev->sysfs_action);
3868 mddev->sysfs_action = NULL;
3869 mddev->private = NULL;
3870 }
3871 kobject_del(&mddev->kobj);
3872 kobject_put(&mddev->kobj);
3873 }
3874
3875 static int md_alloc(dev_t dev, char *name)
3876 {
3877 static DEFINE_MUTEX(disks_mutex);
3878 mddev_t *mddev = mddev_find(dev);
3879 struct gendisk *disk;
3880 int partitioned;
3881 int shift;
3882 int unit;
3883 int error;
3884
3885 if (!mddev)
3886 return -ENODEV;
3887
3888 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
3889 shift = partitioned ? MdpMinorShift : 0;
3890 unit = MINOR(mddev->unit) >> shift;
3891
3892 /* wait for any previous instance if this device
3893 * to be completed removed (mddev_delayed_delete).
3894 */
3895 flush_scheduled_work();
3896
3897 mutex_lock(&disks_mutex);
3898 error = -EEXIST;
3899 if (mddev->gendisk)
3900 goto abort;
3901
3902 if (name) {
3903 /* Need to ensure that 'name' is not a duplicate.
3904 */
3905 mddev_t *mddev2;
3906 spin_lock(&all_mddevs_lock);
3907
3908 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
3909 if (mddev2->gendisk &&
3910 strcmp(mddev2->gendisk->disk_name, name) == 0) {
3911 spin_unlock(&all_mddevs_lock);
3912 goto abort;
3913 }
3914 spin_unlock(&all_mddevs_lock);
3915 }
3916
3917 error = -ENOMEM;
3918 mddev->queue = blk_alloc_queue(GFP_KERNEL);
3919 if (!mddev->queue)
3920 goto abort;
3921 mddev->queue->queuedata = mddev;
3922
3923 /* Can be unlocked because the queue is new: no concurrency */
3924 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue);
3925
3926 blk_queue_make_request(mddev->queue, md_make_request);
3927
3928 disk = alloc_disk(1 << shift);
3929 if (!disk) {
3930 blk_cleanup_queue(mddev->queue);
3931 mddev->queue = NULL;
3932 goto abort;
3933 }
3934 disk->major = MAJOR(mddev->unit);
3935 disk->first_minor = unit << shift;
3936 if (name)
3937 strcpy(disk->disk_name, name);
3938 else if (partitioned)
3939 sprintf(disk->disk_name, "md_d%d", unit);
3940 else
3941 sprintf(disk->disk_name, "md%d", unit);
3942 disk->fops = &md_fops;
3943 disk->private_data = mddev;
3944 disk->queue = mddev->queue;
3945 /* Allow extended partitions. This makes the
3946 * 'mdp' device redundant, but we can't really
3947 * remove it now.
3948 */
3949 disk->flags |= GENHD_FL_EXT_DEVT;
3950 add_disk(disk);
3951 mddev->gendisk = disk;
3952 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
3953 &disk_to_dev(disk)->kobj, "%s", "md");
3954 if (error) {
3955 /* This isn't possible, but as kobject_init_and_add is marked
3956 * __must_check, we must do something with the result
3957 */
3958 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3959 disk->disk_name);
3960 error = 0;
3961 }
3962 abort:
3963 mutex_unlock(&disks_mutex);
3964 if (!error) {
3965 kobject_uevent(&mddev->kobj, KOBJ_ADD);
3966 mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state");
3967 }
3968 mddev_put(mddev);
3969 return error;
3970 }
3971
3972 static struct kobject *md_probe(dev_t dev, int *part, void *data)
3973 {
3974 md_alloc(dev, NULL);
3975 return NULL;
3976 }
3977
3978 static int add_named_array(const char *val, struct kernel_param *kp)
3979 {
3980 /* val must be "md_*" where * is not all digits.
3981 * We allocate an array with a large free minor number, and
3982 * set the name to val. val must not already be an active name.
3983 */
3984 int len = strlen(val);
3985 char buf[DISK_NAME_LEN];
3986
3987 while (len && val[len-1] == '\n')
3988 len--;
3989 if (len >= DISK_NAME_LEN)
3990 return -E2BIG;
3991 strlcpy(buf, val, len+1);
3992 if (strncmp(buf, "md_", 3) != 0)
3993 return -EINVAL;
3994 return md_alloc(0, buf);
3995 }
3996
3997 static void md_safemode_timeout(unsigned long data)
3998 {
3999 mddev_t *mddev = (mddev_t *) data;
4000
4001 if (!atomic_read(&mddev->writes_pending)) {
4002 mddev->safemode = 1;
4003 if (mddev->external)
4004 sysfs_notify_dirent(mddev->sysfs_state);
4005 }
4006 md_wakeup_thread(mddev->thread);
4007 }
4008
4009 static int start_dirty_degraded;
4010
4011 static int do_md_run(mddev_t * mddev)
4012 {
4013 int err;
4014 mdk_rdev_t *rdev;
4015 struct gendisk *disk;
4016 struct mdk_personality *pers;
4017
4018 if (list_empty(&mddev->disks))
4019 /* cannot run an array with no devices.. */
4020 return -EINVAL;
4021
4022 if (mddev->pers)
4023 return -EBUSY;
4024
4025 /*
4026 * Analyze all RAID superblock(s)
4027 */
4028 if (!mddev->raid_disks) {
4029 if (!mddev->persistent)
4030 return -EINVAL;
4031 analyze_sbs(mddev);
4032 }
4033
4034 if (mddev->level != LEVEL_NONE)
4035 request_module("md-level-%d", mddev->level);
4036 else if (mddev->clevel[0])
4037 request_module("md-%s", mddev->clevel);
4038
4039 /*
4040 * Drop all container device buffers, from now on
4041 * the only valid external interface is through the md
4042 * device.
4043 */
4044 list_for_each_entry(rdev, &mddev->disks, same_set) {
4045 if (test_bit(Faulty, &rdev->flags))
4046 continue;
4047 sync_blockdev(rdev->bdev);
4048 invalidate_bdev(rdev->bdev);
4049
4050 /* perform some consistency tests on the device.
4051 * We don't want the data to overlap the metadata,
4052 * Internal Bitmap issues have been handled elsewhere.
4053 */
4054 if (rdev->data_offset < rdev->sb_start) {
4055 if (mddev->dev_sectors &&
4056 rdev->data_offset + mddev->dev_sectors
4057 > rdev->sb_start) {
4058 printk("md: %s: data overlaps metadata\n",
4059 mdname(mddev));
4060 return -EINVAL;
4061 }
4062 } else {
4063 if (rdev->sb_start + rdev->sb_size/512
4064 > rdev->data_offset) {
4065 printk("md: %s: metadata overlaps data\n",
4066 mdname(mddev));
4067 return -EINVAL;
4068 }
4069 }
4070 sysfs_notify_dirent(rdev->sysfs_state);
4071 }
4072
4073 md_probe(mddev->unit, NULL, NULL);
4074 disk = mddev->gendisk;
4075 if (!disk)
4076 return -ENOMEM;
4077
4078 spin_lock(&pers_lock);
4079 pers = find_pers(mddev->level, mddev->clevel);
4080 if (!pers || !try_module_get(pers->owner)) {
4081 spin_unlock(&pers_lock);
4082 if (mddev->level != LEVEL_NONE)
4083 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4084 mddev->level);
4085 else
4086 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4087 mddev->clevel);
4088 return -EINVAL;
4089 }
4090 mddev->pers = pers;
4091 spin_unlock(&pers_lock);
4092 if (mddev->level != pers->level) {
4093 mddev->level = pers->level;
4094 mddev->new_level = pers->level;
4095 }
4096 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4097
4098 if (mddev->reshape_position != MaxSector &&
4099 pers->start_reshape == NULL) {
4100 /* This personality cannot handle reshaping... */
4101 mddev->pers = NULL;
4102 module_put(pers->owner);
4103 return -EINVAL;
4104 }
4105
4106 if (pers->sync_request) {
4107 /* Warn if this is a potentially silly
4108 * configuration.
4109 */
4110 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4111 mdk_rdev_t *rdev2;
4112 int warned = 0;
4113
4114 list_for_each_entry(rdev, &mddev->disks, same_set)
4115 list_for_each_entry(rdev2, &mddev->disks, same_set) {
4116 if (rdev < rdev2 &&
4117 rdev->bdev->bd_contains ==
4118 rdev2->bdev->bd_contains) {
4119 printk(KERN_WARNING
4120 "%s: WARNING: %s appears to be"
4121 " on the same physical disk as"
4122 " %s.\n",
4123 mdname(mddev),
4124 bdevname(rdev->bdev,b),
4125 bdevname(rdev2->bdev,b2));
4126 warned = 1;
4127 }
4128 }
4129
4130 if (warned)
4131 printk(KERN_WARNING
4132 "True protection against single-disk"
4133 " failure might be compromised.\n");
4134 }
4135
4136 mddev->recovery = 0;
4137 /* may be over-ridden by personality */
4138 mddev->resync_max_sectors = mddev->dev_sectors;
4139
4140 mddev->barriers_work = 1;
4141 mddev->ok_start_degraded = start_dirty_degraded;
4142
4143 if (start_readonly)
4144 mddev->ro = 2; /* read-only, but switch on first write */
4145
4146 err = mddev->pers->run(mddev);
4147 if (err)
4148 printk(KERN_ERR "md: pers->run() failed ...\n");
4149 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4150 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4151 " but 'external_size' not in effect?\n", __func__);
4152 printk(KERN_ERR
4153 "md: invalid array_size %llu > default size %llu\n",
4154 (unsigned long long)mddev->array_sectors / 2,
4155 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4156 err = -EINVAL;
4157 mddev->pers->stop(mddev);
4158 }
4159 if (err == 0 && mddev->pers->sync_request) {
4160 err = bitmap_create(mddev);
4161 if (err) {
4162 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4163 mdname(mddev), err);
4164 mddev->pers->stop(mddev);
4165 }
4166 }
4167 if (err) {
4168 module_put(mddev->pers->owner);
4169 mddev->pers = NULL;
4170 bitmap_destroy(mddev);
4171 return err;
4172 }
4173 if (mddev->pers->sync_request) {
4174 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4175 printk(KERN_WARNING
4176 "md: cannot register extra attributes for %s\n",
4177 mdname(mddev));
4178 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4179 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4180 mddev->ro = 0;
4181
4182 atomic_set(&mddev->writes_pending,0);
4183 mddev->safemode = 0;
4184 mddev->safemode_timer.function = md_safemode_timeout;
4185 mddev->safemode_timer.data = (unsigned long) mddev;
4186 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4187 mddev->in_sync = 1;
4188
4189 list_for_each_entry(rdev, &mddev->disks, same_set)
4190 if (rdev->raid_disk >= 0) {
4191 char nm[20];
4192 sprintf(nm, "rd%d", rdev->raid_disk);
4193 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
4194 printk("md: cannot register %s for %s\n",
4195 nm, mdname(mddev));
4196 }
4197
4198 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4199
4200 if (mddev->flags)
4201 md_update_sb(mddev, 0);
4202
4203 set_capacity(disk, mddev->array_sectors);
4204
4205 /* If there is a partially-recovered drive we need to
4206 * start recovery here. If we leave it to md_check_recovery,
4207 * it will remove the drives and not do the right thing
4208 */
4209 if (mddev->degraded && !mddev->sync_thread) {
4210 int spares = 0;
4211 list_for_each_entry(rdev, &mddev->disks, same_set)
4212 if (rdev->raid_disk >= 0 &&
4213 !test_bit(In_sync, &rdev->flags) &&
4214 !test_bit(Faulty, &rdev->flags))
4215 /* complete an interrupted recovery */
4216 spares++;
4217 if (spares && mddev->pers->sync_request) {
4218 mddev->recovery = 0;
4219 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
4220 mddev->sync_thread = md_register_thread(md_do_sync,
4221 mddev,
4222 "%s_resync");
4223 if (!mddev->sync_thread) {
4224 printk(KERN_ERR "%s: could not start resync"
4225 " thread...\n",
4226 mdname(mddev));
4227 /* leave the spares where they are, it shouldn't hurt */
4228 mddev->recovery = 0;
4229 }
4230 }
4231 }
4232 md_wakeup_thread(mddev->thread);
4233 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4234
4235 revalidate_disk(mddev->gendisk);
4236 mddev->changed = 1;
4237 md_new_event(mddev);
4238 sysfs_notify_dirent(mddev->sysfs_state);
4239 if (mddev->sysfs_action)
4240 sysfs_notify_dirent(mddev->sysfs_action);
4241 sysfs_notify(&mddev->kobj, NULL, "degraded");
4242 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4243 return 0;
4244 }
4245
4246 static int restart_array(mddev_t *mddev)
4247 {
4248 struct gendisk *disk = mddev->gendisk;
4249
4250 /* Complain if it has no devices */
4251 if (list_empty(&mddev->disks))
4252 return -ENXIO;
4253 if (!mddev->pers)
4254 return -EINVAL;
4255 if (!mddev->ro)
4256 return -EBUSY;
4257 mddev->safemode = 0;
4258 mddev->ro = 0;
4259 set_disk_ro(disk, 0);
4260 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4261 mdname(mddev));
4262 /* Kick recovery or resync if necessary */
4263 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4264 md_wakeup_thread(mddev->thread);
4265 md_wakeup_thread(mddev->sync_thread);
4266 sysfs_notify_dirent(mddev->sysfs_state);
4267 return 0;
4268 }
4269
4270 /* similar to deny_write_access, but accounts for our holding a reference
4271 * to the file ourselves */
4272 static int deny_bitmap_write_access(struct file * file)
4273 {
4274 struct inode *inode = file->f_mapping->host;
4275
4276 spin_lock(&inode->i_lock);
4277 if (atomic_read(&inode->i_writecount) > 1) {
4278 spin_unlock(&inode->i_lock);
4279 return -ETXTBSY;
4280 }
4281 atomic_set(&inode->i_writecount, -1);
4282 spin_unlock(&inode->i_lock);
4283
4284 return 0;
4285 }
4286
4287 static void restore_bitmap_write_access(struct file *file)
4288 {
4289 struct inode *inode = file->f_mapping->host;
4290
4291 spin_lock(&inode->i_lock);
4292 atomic_set(&inode->i_writecount, 1);
4293 spin_unlock(&inode->i_lock);
4294 }
4295
4296 /* mode:
4297 * 0 - completely stop and dis-assemble array
4298 * 1 - switch to readonly
4299 * 2 - stop but do not disassemble array
4300 */
4301 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4302 {
4303 int err = 0;
4304 struct gendisk *disk = mddev->gendisk;
4305 mdk_rdev_t *rdev;
4306
4307 if (atomic_read(&mddev->openers) > is_open) {
4308 printk("md: %s still in use.\n",mdname(mddev));
4309 return -EBUSY;
4310 }
4311
4312 if (mddev->pers) {
4313
4314 if (mddev->sync_thread) {
4315 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4316 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4317 md_unregister_thread(mddev->sync_thread);
4318 mddev->sync_thread = NULL;
4319 }
4320
4321 del_timer_sync(&mddev->safemode_timer);
4322
4323 switch(mode) {
4324 case 1: /* readonly */
4325 err = -ENXIO;
4326 if (mddev->ro==1)
4327 goto out;
4328 mddev->ro = 1;
4329 break;
4330 case 0: /* disassemble */
4331 case 2: /* stop */
4332 bitmap_flush(mddev);
4333 md_super_wait(mddev);
4334 if (mddev->ro)
4335 set_disk_ro(disk, 0);
4336
4337 mddev->pers->stop(mddev);
4338 mddev->queue->merge_bvec_fn = NULL;
4339 mddev->queue->unplug_fn = NULL;
4340 mddev->queue->backing_dev_info.congested_fn = NULL;
4341 module_put(mddev->pers->owner);
4342 if (mddev->pers->sync_request)
4343 mddev->private = &md_redundancy_group;
4344 mddev->pers = NULL;
4345 /* tell userspace to handle 'inactive' */
4346 sysfs_notify_dirent(mddev->sysfs_state);
4347
4348 list_for_each_entry(rdev, &mddev->disks, same_set)
4349 if (rdev->raid_disk >= 0) {
4350 char nm[20];
4351 sprintf(nm, "rd%d", rdev->raid_disk);
4352 sysfs_remove_link(&mddev->kobj, nm);
4353 }
4354
4355 set_capacity(disk, 0);
4356 mddev->changed = 1;
4357
4358 if (mddev->ro)
4359 mddev->ro = 0;
4360 }
4361 if (!mddev->in_sync || mddev->flags) {
4362 /* mark array as shutdown cleanly */
4363 mddev->in_sync = 1;
4364 md_update_sb(mddev, 1);
4365 }
4366 if (mode == 1)
4367 set_disk_ro(disk, 1);
4368 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4369 }
4370
4371 /*
4372 * Free resources if final stop
4373 */
4374 if (mode == 0) {
4375
4376 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4377
4378 bitmap_destroy(mddev);
4379 if (mddev->bitmap_file) {
4380 restore_bitmap_write_access(mddev->bitmap_file);
4381 fput(mddev->bitmap_file);
4382 mddev->bitmap_file = NULL;
4383 }
4384 mddev->bitmap_offset = 0;
4385
4386 /* make sure all md_delayed_delete calls have finished */
4387 flush_scheduled_work();
4388
4389 export_array(mddev);
4390
4391 mddev->array_sectors = 0;
4392 mddev->external_size = 0;
4393 mddev->dev_sectors = 0;
4394 mddev->raid_disks = 0;
4395 mddev->recovery_cp = 0;
4396 mddev->resync_min = 0;
4397 mddev->resync_max = MaxSector;
4398 mddev->reshape_position = MaxSector;
4399 mddev->external = 0;
4400 mddev->persistent = 0;
4401 mddev->level = LEVEL_NONE;
4402 mddev->clevel[0] = 0;
4403 mddev->flags = 0;
4404 mddev->ro = 0;
4405 mddev->metadata_type[0] = 0;
4406 mddev->chunk_sectors = 0;
4407 mddev->ctime = mddev->utime = 0;
4408 mddev->layout = 0;
4409 mddev->max_disks = 0;
4410 mddev->events = 0;
4411 mddev->delta_disks = 0;
4412 mddev->new_level = LEVEL_NONE;
4413 mddev->new_layout = 0;
4414 mddev->new_chunk_sectors = 0;
4415 mddev->curr_resync = 0;
4416 mddev->resync_mismatches = 0;
4417 mddev->suspend_lo = mddev->suspend_hi = 0;
4418 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4419 mddev->recovery = 0;
4420 mddev->in_sync = 0;
4421 mddev->changed = 0;
4422 mddev->degraded = 0;
4423 mddev->barriers_work = 0;
4424 mddev->safemode = 0;
4425 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4426 if (mddev->hold_active == UNTIL_STOP)
4427 mddev->hold_active = 0;
4428
4429 } else if (mddev->pers)
4430 printk(KERN_INFO "md: %s switched to read-only mode.\n",
4431 mdname(mddev));
4432 err = 0;
4433 blk_integrity_unregister(disk);
4434 md_new_event(mddev);
4435 sysfs_notify_dirent(mddev->sysfs_state);
4436 out:
4437 return err;
4438 }
4439
4440 #ifndef MODULE
4441 static void autorun_array(mddev_t *mddev)
4442 {
4443 mdk_rdev_t *rdev;
4444 int err;
4445
4446 if (list_empty(&mddev->disks))
4447 return;
4448
4449 printk(KERN_INFO "md: running: ");
4450
4451 list_for_each_entry(rdev, &mddev->disks, same_set) {
4452 char b[BDEVNAME_SIZE];
4453 printk("<%s>", bdevname(rdev->bdev,b));
4454 }
4455 printk("\n");
4456
4457 err = do_md_run(mddev);
4458 if (err) {
4459 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4460 do_md_stop(mddev, 0, 0);
4461 }
4462 }
4463
4464 /*
4465 * lets try to run arrays based on all disks that have arrived
4466 * until now. (those are in pending_raid_disks)
4467 *
4468 * the method: pick the first pending disk, collect all disks with
4469 * the same UUID, remove all from the pending list and put them into
4470 * the 'same_array' list. Then order this list based on superblock
4471 * update time (freshest comes first), kick out 'old' disks and
4472 * compare superblocks. If everything's fine then run it.
4473 *
4474 * If "unit" is allocated, then bump its reference count
4475 */
4476 static void autorun_devices(int part)
4477 {
4478 mdk_rdev_t *rdev0, *rdev, *tmp;
4479 mddev_t *mddev;
4480 char b[BDEVNAME_SIZE];
4481
4482 printk(KERN_INFO "md: autorun ...\n");
4483 while (!list_empty(&pending_raid_disks)) {
4484 int unit;
4485 dev_t dev;
4486 LIST_HEAD(candidates);
4487 rdev0 = list_entry(pending_raid_disks.next,
4488 mdk_rdev_t, same_set);
4489
4490 printk(KERN_INFO "md: considering %s ...\n",
4491 bdevname(rdev0->bdev,b));
4492 INIT_LIST_HEAD(&candidates);
4493 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4494 if (super_90_load(rdev, rdev0, 0) >= 0) {
4495 printk(KERN_INFO "md: adding %s ...\n",
4496 bdevname(rdev->bdev,b));
4497 list_move(&rdev->same_set, &candidates);
4498 }
4499 /*
4500 * now we have a set of devices, with all of them having
4501 * mostly sane superblocks. It's time to allocate the
4502 * mddev.
4503 */
4504 if (part) {
4505 dev = MKDEV(mdp_major,
4506 rdev0->preferred_minor << MdpMinorShift);
4507 unit = MINOR(dev) >> MdpMinorShift;
4508 } else {
4509 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4510 unit = MINOR(dev);
4511 }
4512 if (rdev0->preferred_minor != unit) {
4513 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4514 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4515 break;
4516 }
4517
4518 md_probe(dev, NULL, NULL);
4519 mddev = mddev_find(dev);
4520 if (!mddev || !mddev->gendisk) {
4521 if (mddev)
4522 mddev_put(mddev);
4523 printk(KERN_ERR
4524 "md: cannot allocate memory for md drive.\n");
4525 break;
4526 }
4527 if (mddev_lock(mddev))
4528 printk(KERN_WARNING "md: %s locked, cannot run\n",
4529 mdname(mddev));
4530 else if (mddev->raid_disks || mddev->major_version
4531 || !list_empty(&mddev->disks)) {
4532 printk(KERN_WARNING
4533 "md: %s already running, cannot run %s\n",
4534 mdname(mddev), bdevname(rdev0->bdev,b));
4535 mddev_unlock(mddev);
4536 } else {
4537 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4538 mddev->persistent = 1;
4539 rdev_for_each_list(rdev, tmp, &candidates) {
4540 list_del_init(&rdev->same_set);
4541 if (bind_rdev_to_array(rdev, mddev))
4542 export_rdev(rdev);
4543 }
4544 autorun_array(mddev);
4545 mddev_unlock(mddev);
4546 }
4547 /* on success, candidates will be empty, on error
4548 * it won't...
4549 */
4550 rdev_for_each_list(rdev, tmp, &candidates) {
4551 list_del_init(&rdev->same_set);
4552 export_rdev(rdev);
4553 }
4554 mddev_put(mddev);
4555 }
4556 printk(KERN_INFO "md: ... autorun DONE.\n");
4557 }
4558 #endif /* !MODULE */
4559
4560 static int get_version(void __user * arg)
4561 {
4562 mdu_version_t ver;
4563
4564 ver.major = MD_MAJOR_VERSION;
4565 ver.minor = MD_MINOR_VERSION;
4566 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4567
4568 if (copy_to_user(arg, &ver, sizeof(ver)))
4569 return -EFAULT;
4570
4571 return 0;
4572 }
4573
4574 static int get_array_info(mddev_t * mddev, void __user * arg)
4575 {
4576 mdu_array_info_t info;
4577 int nr,working,active,failed,spare;
4578 mdk_rdev_t *rdev;
4579
4580 nr=working=active=failed=spare=0;
4581 list_for_each_entry(rdev, &mddev->disks, same_set) {
4582 nr++;
4583 if (test_bit(Faulty, &rdev->flags))
4584 failed++;
4585 else {
4586 working++;
4587 if (test_bit(In_sync, &rdev->flags))
4588 active++;
4589 else
4590 spare++;
4591 }
4592 }
4593
4594 info.major_version = mddev->major_version;
4595 info.minor_version = mddev->minor_version;
4596 info.patch_version = MD_PATCHLEVEL_VERSION;
4597 info.ctime = mddev->ctime;
4598 info.level = mddev->level;
4599 info.size = mddev->dev_sectors / 2;
4600 if (info.size != mddev->dev_sectors / 2) /* overflow */
4601 info.size = -1;
4602 info.nr_disks = nr;
4603 info.raid_disks = mddev->raid_disks;
4604 info.md_minor = mddev->md_minor;
4605 info.not_persistent= !mddev->persistent;
4606
4607 info.utime = mddev->utime;
4608 info.state = 0;
4609 if (mddev->in_sync)
4610 info.state = (1<<MD_SB_CLEAN);
4611 if (mddev->bitmap && mddev->bitmap_offset)
4612 info.state = (1<<MD_SB_BITMAP_PRESENT);
4613 info.active_disks = active;
4614 info.working_disks = working;
4615 info.failed_disks = failed;
4616 info.spare_disks = spare;
4617
4618 info.layout = mddev->layout;
4619 info.chunk_size = mddev->chunk_sectors << 9;
4620
4621 if (copy_to_user(arg, &info, sizeof(info)))
4622 return -EFAULT;
4623
4624 return 0;
4625 }
4626
4627 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4628 {
4629 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4630 char *ptr, *buf = NULL;
4631 int err = -ENOMEM;
4632
4633 if (md_allow_write(mddev))
4634 file = kmalloc(sizeof(*file), GFP_NOIO);
4635 else
4636 file = kmalloc(sizeof(*file), GFP_KERNEL);
4637
4638 if (!file)
4639 goto out;
4640
4641 /* bitmap disabled, zero the first byte and copy out */
4642 if (!mddev->bitmap || !mddev->bitmap->file) {
4643 file->pathname[0] = '\0';
4644 goto copy_out;
4645 }
4646
4647 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4648 if (!buf)
4649 goto out;
4650
4651 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4652 if (IS_ERR(ptr))
4653 goto out;
4654
4655 strcpy(file->pathname, ptr);
4656
4657 copy_out:
4658 err = 0;
4659 if (copy_to_user(arg, file, sizeof(*file)))
4660 err = -EFAULT;
4661 out:
4662 kfree(buf);
4663 kfree(file);
4664 return err;
4665 }
4666
4667 static int get_disk_info(mddev_t * mddev, void __user * arg)
4668 {
4669 mdu_disk_info_t info;
4670 mdk_rdev_t *rdev;
4671
4672 if (copy_from_user(&info, arg, sizeof(info)))
4673 return -EFAULT;
4674
4675 rdev = find_rdev_nr(mddev, info.number);
4676 if (rdev) {
4677 info.major = MAJOR(rdev->bdev->bd_dev);
4678 info.minor = MINOR(rdev->bdev->bd_dev);
4679 info.raid_disk = rdev->raid_disk;
4680 info.state = 0;
4681 if (test_bit(Faulty, &rdev->flags))
4682 info.state |= (1<<MD_DISK_FAULTY);
4683 else if (test_bit(In_sync, &rdev->flags)) {
4684 info.state |= (1<<MD_DISK_ACTIVE);
4685 info.state |= (1<<MD_DISK_SYNC);
4686 }
4687 if (test_bit(WriteMostly, &rdev->flags))
4688 info.state |= (1<<MD_DISK_WRITEMOSTLY);
4689 } else {
4690 info.major = info.minor = 0;
4691 info.raid_disk = -1;
4692 info.state = (1<<MD_DISK_REMOVED);
4693 }
4694
4695 if (copy_to_user(arg, &info, sizeof(info)))
4696 return -EFAULT;
4697
4698 return 0;
4699 }
4700
4701 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4702 {
4703 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4704 mdk_rdev_t *rdev;
4705 dev_t dev = MKDEV(info->major,info->minor);
4706
4707 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4708 return -EOVERFLOW;
4709
4710 if (!mddev->raid_disks) {
4711 int err;
4712 /* expecting a device which has a superblock */
4713 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4714 if (IS_ERR(rdev)) {
4715 printk(KERN_WARNING
4716 "md: md_import_device returned %ld\n",
4717 PTR_ERR(rdev));
4718 return PTR_ERR(rdev);
4719 }
4720 if (!list_empty(&mddev->disks)) {
4721 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4722 mdk_rdev_t, same_set);
4723 int err = super_types[mddev->major_version]
4724 .load_super(rdev, rdev0, mddev->minor_version);
4725 if (err < 0) {
4726 printk(KERN_WARNING
4727 "md: %s has different UUID to %s\n",
4728 bdevname(rdev->bdev,b),
4729 bdevname(rdev0->bdev,b2));
4730 export_rdev(rdev);
4731 return -EINVAL;
4732 }
4733 }
4734 err = bind_rdev_to_array(rdev, mddev);
4735 if (err)
4736 export_rdev(rdev);
4737 return err;
4738 }
4739
4740 /*
4741 * add_new_disk can be used once the array is assembled
4742 * to add "hot spares". They must already have a superblock
4743 * written
4744 */
4745 if (mddev->pers) {
4746 int err;
4747 if (!mddev->pers->hot_add_disk) {
4748 printk(KERN_WARNING
4749 "%s: personality does not support diskops!\n",
4750 mdname(mddev));
4751 return -EINVAL;
4752 }
4753 if (mddev->persistent)
4754 rdev = md_import_device(dev, mddev->major_version,
4755 mddev->minor_version);
4756 else
4757 rdev = md_import_device(dev, -1, -1);
4758 if (IS_ERR(rdev)) {
4759 printk(KERN_WARNING
4760 "md: md_import_device returned %ld\n",
4761 PTR_ERR(rdev));
4762 return PTR_ERR(rdev);
4763 }
4764 /* set save_raid_disk if appropriate */
4765 if (!mddev->persistent) {
4766 if (info->state & (1<<MD_DISK_SYNC) &&
4767 info->raid_disk < mddev->raid_disks)
4768 rdev->raid_disk = info->raid_disk;
4769 else
4770 rdev->raid_disk = -1;
4771 } else
4772 super_types[mddev->major_version].
4773 validate_super(mddev, rdev);
4774 rdev->saved_raid_disk = rdev->raid_disk;
4775
4776 clear_bit(In_sync, &rdev->flags); /* just to be sure */
4777 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4778 set_bit(WriteMostly, &rdev->flags);
4779 else
4780 clear_bit(WriteMostly, &rdev->flags);
4781
4782 rdev->raid_disk = -1;
4783 err = bind_rdev_to_array(rdev, mddev);
4784 if (!err && !mddev->pers->hot_remove_disk) {
4785 /* If there is hot_add_disk but no hot_remove_disk
4786 * then added disks for geometry changes,
4787 * and should be added immediately.
4788 */
4789 super_types[mddev->major_version].
4790 validate_super(mddev, rdev);
4791 err = mddev->pers->hot_add_disk(mddev, rdev);
4792 if (err)
4793 unbind_rdev_from_array(rdev);
4794 }
4795 if (err)
4796 export_rdev(rdev);
4797 else
4798 sysfs_notify_dirent(rdev->sysfs_state);
4799
4800 md_update_sb(mddev, 1);
4801 if (mddev->degraded)
4802 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4803 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4804 md_wakeup_thread(mddev->thread);
4805 return err;
4806 }
4807
4808 /* otherwise, add_new_disk is only allowed
4809 * for major_version==0 superblocks
4810 */
4811 if (mddev->major_version != 0) {
4812 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4813 mdname(mddev));
4814 return -EINVAL;
4815 }
4816
4817 if (!(info->state & (1<<MD_DISK_FAULTY))) {
4818 int err;
4819 rdev = md_import_device(dev, -1, 0);
4820 if (IS_ERR(rdev)) {
4821 printk(KERN_WARNING
4822 "md: error, md_import_device() returned %ld\n",
4823 PTR_ERR(rdev));
4824 return PTR_ERR(rdev);
4825 }
4826 rdev->desc_nr = info->number;
4827 if (info->raid_disk < mddev->raid_disks)
4828 rdev->raid_disk = info->raid_disk;
4829 else
4830 rdev->raid_disk = -1;
4831
4832 if (rdev->raid_disk < mddev->raid_disks)
4833 if (info->state & (1<<MD_DISK_SYNC))
4834 set_bit(In_sync, &rdev->flags);
4835
4836 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4837 set_bit(WriteMostly, &rdev->flags);
4838
4839 if (!mddev->persistent) {
4840 printk(KERN_INFO "md: nonpersistent superblock ...\n");
4841 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4842 } else
4843 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4844 rdev->sectors = rdev->sb_start;
4845
4846 err = bind_rdev_to_array(rdev, mddev);
4847 if (err) {
4848 export_rdev(rdev);
4849 return err;
4850 }
4851 }
4852
4853 return 0;
4854 }
4855
4856 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4857 {
4858 char b[BDEVNAME_SIZE];
4859 mdk_rdev_t *rdev;
4860
4861 rdev = find_rdev(mddev, dev);
4862 if (!rdev)
4863 return -ENXIO;
4864
4865 if (rdev->raid_disk >= 0)
4866 goto busy;
4867
4868 kick_rdev_from_array(rdev);
4869 md_update_sb(mddev, 1);
4870 md_new_event(mddev);
4871
4872 return 0;
4873 busy:
4874 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
4875 bdevname(rdev->bdev,b), mdname(mddev));
4876 return -EBUSY;
4877 }
4878
4879 static int hot_add_disk(mddev_t * mddev, dev_t dev)
4880 {
4881 char b[BDEVNAME_SIZE];
4882 int err;
4883 mdk_rdev_t *rdev;
4884
4885 if (!mddev->pers)
4886 return -ENODEV;
4887
4888 if (mddev->major_version != 0) {
4889 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4890 " version-0 superblocks.\n",
4891 mdname(mddev));
4892 return -EINVAL;
4893 }
4894 if (!mddev->pers->hot_add_disk) {
4895 printk(KERN_WARNING
4896 "%s: personality does not support diskops!\n",
4897 mdname(mddev));
4898 return -EINVAL;
4899 }
4900
4901 rdev = md_import_device(dev, -1, 0);
4902 if (IS_ERR(rdev)) {
4903 printk(KERN_WARNING
4904 "md: error, md_import_device() returned %ld\n",
4905 PTR_ERR(rdev));
4906 return -EINVAL;
4907 }
4908
4909 if (mddev->persistent)
4910 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4911 else
4912 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4913
4914 rdev->sectors = rdev->sb_start;
4915
4916 if (test_bit(Faulty, &rdev->flags)) {
4917 printk(KERN_WARNING
4918 "md: can not hot-add faulty %s disk to %s!\n",
4919 bdevname(rdev->bdev,b), mdname(mddev));
4920 err = -EINVAL;
4921 goto abort_export;
4922 }
4923 clear_bit(In_sync, &rdev->flags);
4924 rdev->desc_nr = -1;
4925 rdev->saved_raid_disk = -1;
4926 err = bind_rdev_to_array(rdev, mddev);
4927 if (err)
4928 goto abort_export;
4929
4930 /*
4931 * The rest should better be atomic, we can have disk failures
4932 * noticed in interrupt contexts ...
4933 */
4934
4935 rdev->raid_disk = -1;
4936
4937 md_update_sb(mddev, 1);
4938
4939 /*
4940 * Kick recovery, maybe this spare has to be added to the
4941 * array immediately.
4942 */
4943 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4944 md_wakeup_thread(mddev->thread);
4945 md_new_event(mddev);
4946 return 0;
4947
4948 abort_export:
4949 export_rdev(rdev);
4950 return err;
4951 }
4952
4953 static int set_bitmap_file(mddev_t *mddev, int fd)
4954 {
4955 int err;
4956
4957 if (mddev->pers) {
4958 if (!mddev->pers->quiesce)
4959 return -EBUSY;
4960 if (mddev->recovery || mddev->sync_thread)
4961 return -EBUSY;
4962 /* we should be able to change the bitmap.. */
4963 }
4964
4965
4966 if (fd >= 0) {
4967 if (mddev->bitmap)
4968 return -EEXIST; /* cannot add when bitmap is present */
4969 mddev->bitmap_file = fget(fd);
4970
4971 if (mddev->bitmap_file == NULL) {
4972 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4973 mdname(mddev));
4974 return -EBADF;
4975 }
4976
4977 err = deny_bitmap_write_access(mddev->bitmap_file);
4978 if (err) {
4979 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4980 mdname(mddev));
4981 fput(mddev->bitmap_file);
4982 mddev->bitmap_file = NULL;
4983 return err;
4984 }
4985 mddev->bitmap_offset = 0; /* file overrides offset */
4986 } else if (mddev->bitmap == NULL)
4987 return -ENOENT; /* cannot remove what isn't there */
4988 err = 0;
4989 if (mddev->pers) {
4990 mddev->pers->quiesce(mddev, 1);
4991 if (fd >= 0)
4992 err = bitmap_create(mddev);
4993 if (fd < 0 || err) {
4994 bitmap_destroy(mddev);
4995 fd = -1; /* make sure to put the file */
4996 }
4997 mddev->pers->quiesce(mddev, 0);
4998 }
4999 if (fd < 0) {
5000 if (mddev->bitmap_file) {
5001 restore_bitmap_write_access(mddev->bitmap_file);
5002 fput(mddev->bitmap_file);
5003 }
5004 mddev->bitmap_file = NULL;
5005 }
5006
5007 return err;
5008 }
5009
5010 /*
5011 * set_array_info is used two different ways
5012 * The original usage is when creating a new array.
5013 * In this usage, raid_disks is > 0 and it together with
5014 * level, size, not_persistent,layout,chunksize determine the
5015 * shape of the array.
5016 * This will always create an array with a type-0.90.0 superblock.
5017 * The newer usage is when assembling an array.
5018 * In this case raid_disks will be 0, and the major_version field is
5019 * use to determine which style super-blocks are to be found on the devices.
5020 * The minor and patch _version numbers are also kept incase the
5021 * super_block handler wishes to interpret them.
5022 */
5023 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5024 {
5025
5026 if (info->raid_disks == 0) {
5027 /* just setting version number for superblock loading */
5028 if (info->major_version < 0 ||
5029 info->major_version >= ARRAY_SIZE(super_types) ||
5030 super_types[info->major_version].name == NULL) {
5031 /* maybe try to auto-load a module? */
5032 printk(KERN_INFO
5033 "md: superblock version %d not known\n",
5034 info->major_version);
5035 return -EINVAL;
5036 }
5037 mddev->major_version = info->major_version;
5038 mddev->minor_version = info->minor_version;
5039 mddev->patch_version = info->patch_version;
5040 mddev->persistent = !info->not_persistent;
5041 return 0;
5042 }
5043 mddev->major_version = MD_MAJOR_VERSION;
5044 mddev->minor_version = MD_MINOR_VERSION;
5045 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5046 mddev->ctime = get_seconds();
5047
5048 mddev->level = info->level;
5049 mddev->clevel[0] = 0;
5050 mddev->dev_sectors = 2 * (sector_t)info->size;
5051 mddev->raid_disks = info->raid_disks;
5052 /* don't set md_minor, it is determined by which /dev/md* was
5053 * openned
5054 */
5055 if (info->state & (1<<MD_SB_CLEAN))
5056 mddev->recovery_cp = MaxSector;
5057 else
5058 mddev->recovery_cp = 0;
5059 mddev->persistent = ! info->not_persistent;
5060 mddev->external = 0;
5061
5062 mddev->layout = info->layout;
5063 mddev->chunk_sectors = info->chunk_size >> 9;
5064
5065 mddev->max_disks = MD_SB_DISKS;
5066
5067 if (mddev->persistent)
5068 mddev->flags = 0;
5069 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5070
5071 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
5072 mddev->bitmap_offset = 0;
5073
5074 mddev->reshape_position = MaxSector;
5075
5076 /*
5077 * Generate a 128 bit UUID
5078 */
5079 get_random_bytes(mddev->uuid, 16);
5080
5081 mddev->new_level = mddev->level;
5082 mddev->new_chunk_sectors = mddev->chunk_sectors;
5083 mddev->new_layout = mddev->layout;
5084 mddev->delta_disks = 0;
5085
5086 return 0;
5087 }
5088
5089 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5090 {
5091 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5092
5093 if (mddev->external_size)
5094 return;
5095
5096 mddev->array_sectors = array_sectors;
5097 }
5098 EXPORT_SYMBOL(md_set_array_sectors);
5099
5100 static int update_size(mddev_t *mddev, sector_t num_sectors)
5101 {
5102 mdk_rdev_t *rdev;
5103 int rv;
5104 int fit = (num_sectors == 0);
5105
5106 if (mddev->pers->resize == NULL)
5107 return -EINVAL;
5108 /* The "num_sectors" is the number of sectors of each device that
5109 * is used. This can only make sense for arrays with redundancy.
5110 * linear and raid0 always use whatever space is available. We can only
5111 * consider changing this number if no resync or reconstruction is
5112 * happening, and if the new size is acceptable. It must fit before the
5113 * sb_start or, if that is <data_offset, it must fit before the size
5114 * of each device. If num_sectors is zero, we find the largest size
5115 * that fits.
5116
5117 */
5118 if (mddev->sync_thread)
5119 return -EBUSY;
5120 if (mddev->bitmap)
5121 /* Sorry, cannot grow a bitmap yet, just remove it,
5122 * grow, and re-add.
5123 */
5124 return -EBUSY;
5125 list_for_each_entry(rdev, &mddev->disks, same_set) {
5126 sector_t avail = rdev->sectors;
5127
5128 if (fit && (num_sectors == 0 || num_sectors > avail))
5129 num_sectors = avail;
5130 if (avail < num_sectors)
5131 return -ENOSPC;
5132 }
5133 rv = mddev->pers->resize(mddev, num_sectors);
5134 if (!rv)
5135 revalidate_disk(mddev->gendisk);
5136 return rv;
5137 }
5138
5139 static int update_raid_disks(mddev_t *mddev, int raid_disks)
5140 {
5141 int rv;
5142 /* change the number of raid disks */
5143 if (mddev->pers->check_reshape == NULL)
5144 return -EINVAL;
5145 if (raid_disks <= 0 ||
5146 raid_disks >= mddev->max_disks)
5147 return -EINVAL;
5148 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5149 return -EBUSY;
5150 mddev->delta_disks = raid_disks - mddev->raid_disks;
5151
5152 rv = mddev->pers->check_reshape(mddev);
5153 return rv;
5154 }
5155
5156
5157 /*
5158 * update_array_info is used to change the configuration of an
5159 * on-line array.
5160 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5161 * fields in the info are checked against the array.
5162 * Any differences that cannot be handled will cause an error.
5163 * Normally, only one change can be managed at a time.
5164 */
5165 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5166 {
5167 int rv = 0;
5168 int cnt = 0;
5169 int state = 0;
5170
5171 /* calculate expected state,ignoring low bits */
5172 if (mddev->bitmap && mddev->bitmap_offset)
5173 state |= (1 << MD_SB_BITMAP_PRESENT);
5174
5175 if (mddev->major_version != info->major_version ||
5176 mddev->minor_version != info->minor_version ||
5177 /* mddev->patch_version != info->patch_version || */
5178 mddev->ctime != info->ctime ||
5179 mddev->level != info->level ||
5180 /* mddev->layout != info->layout || */
5181 !mddev->persistent != info->not_persistent||
5182 mddev->chunk_sectors != info->chunk_size >> 9 ||
5183 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5184 ((state^info->state) & 0xfffffe00)
5185 )
5186 return -EINVAL;
5187 /* Check there is only one change */
5188 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5189 cnt++;
5190 if (mddev->raid_disks != info->raid_disks)
5191 cnt++;
5192 if (mddev->layout != info->layout)
5193 cnt++;
5194 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5195 cnt++;
5196 if (cnt == 0)
5197 return 0;
5198 if (cnt > 1)
5199 return -EINVAL;
5200
5201 if (mddev->layout != info->layout) {
5202 /* Change layout
5203 * we don't need to do anything at the md level, the
5204 * personality will take care of it all.
5205 */
5206 if (mddev->pers->check_reshape == NULL)
5207 return -EINVAL;
5208 else {
5209 mddev->new_layout = info->layout;
5210 rv = mddev->pers->check_reshape(mddev);
5211 if (rv)
5212 mddev->new_layout = mddev->layout;
5213 return rv;
5214 }
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 .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 const 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 (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6359 ((mddev->curr_resync > mddev->curr_resync_completed &&
6360 (mddev->curr_resync - mddev->curr_resync_completed)
6361 > (max_sectors >> 4)) ||
6362 (j - mddev->curr_resync_completed)*2
6363 >= mddev->resync_max - mddev->curr_resync_completed
6364 )) {
6365 /* time to update curr_resync_completed */
6366 blk_unplug(mddev->queue);
6367 wait_event(mddev->recovery_wait,
6368 atomic_read(&mddev->recovery_active) == 0);
6369 mddev->curr_resync_completed =
6370 mddev->curr_resync;
6371 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6372 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6373 }
6374
6375 while (j >= mddev->resync_max && !kthread_should_stop()) {
6376 /* As this condition is controlled by user-space,
6377 * we can block indefinitely, so use '_interruptible'
6378 * to avoid triggering warnings.
6379 */
6380 flush_signals(current); /* just in case */
6381 wait_event_interruptible(mddev->recovery_wait,
6382 mddev->resync_max > j
6383 || kthread_should_stop());
6384 }
6385
6386 if (kthread_should_stop())
6387 goto interrupted;
6388
6389 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6390 currspeed < speed_min(mddev));
6391 if (sectors == 0) {
6392 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6393 goto out;
6394 }
6395
6396 if (!skipped) { /* actual IO requested */
6397 io_sectors += sectors;
6398 atomic_add(sectors, &mddev->recovery_active);
6399 }
6400
6401 j += sectors;
6402 if (j>1) mddev->curr_resync = j;
6403 mddev->curr_mark_cnt = io_sectors;
6404 if (last_check == 0)
6405 /* this is the earliers that rebuilt will be
6406 * visible in /proc/mdstat
6407 */
6408 md_new_event(mddev);
6409
6410 if (last_check + window > io_sectors || j == max_sectors)
6411 continue;
6412
6413 last_check = io_sectors;
6414
6415 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6416 break;
6417
6418 repeat:
6419 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6420 /* step marks */
6421 int next = (last_mark+1) % SYNC_MARKS;
6422
6423 mddev->resync_mark = mark[next];
6424 mddev->resync_mark_cnt = mark_cnt[next];
6425 mark[next] = jiffies;
6426 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
6427 last_mark = next;
6428 }
6429
6430
6431 if (kthread_should_stop())
6432 goto interrupted;
6433
6434
6435 /*
6436 * this loop exits only if either when we are slower than
6437 * the 'hard' speed limit, or the system was IO-idle for
6438 * a jiffy.
6439 * the system might be non-idle CPU-wise, but we only care
6440 * about not overloading the IO subsystem. (things like an
6441 * e2fsck being done on the RAID array should execute fast)
6442 */
6443 blk_unplug(mddev->queue);
6444 cond_resched();
6445
6446 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6447 /((jiffies-mddev->resync_mark)/HZ +1) +1;
6448
6449 if (currspeed > speed_min(mddev)) {
6450 if ((currspeed > speed_max(mddev)) ||
6451 !is_mddev_idle(mddev, 0)) {
6452 msleep(500);
6453 goto repeat;
6454 }
6455 }
6456 }
6457 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
6458 /*
6459 * this also signals 'finished resyncing' to md_stop
6460 */
6461 out:
6462 blk_unplug(mddev->queue);
6463
6464 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6465
6466 /* tell personality that we are finished */
6467 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
6468
6469 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
6470 mddev->curr_resync > 2) {
6471 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6472 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6473 if (mddev->curr_resync >= mddev->recovery_cp) {
6474 printk(KERN_INFO
6475 "md: checkpointing %s of %s.\n",
6476 desc, mdname(mddev));
6477 mddev->recovery_cp = mddev->curr_resync;
6478 }
6479 } else
6480 mddev->recovery_cp = MaxSector;
6481 } else {
6482 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6483 mddev->curr_resync = MaxSector;
6484 list_for_each_entry(rdev, &mddev->disks, same_set)
6485 if (rdev->raid_disk >= 0 &&
6486 !test_bit(Faulty, &rdev->flags) &&
6487 !test_bit(In_sync, &rdev->flags) &&
6488 rdev->recovery_offset < mddev->curr_resync)
6489 rdev->recovery_offset = mddev->curr_resync;
6490 }
6491 }
6492 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6493
6494 skip:
6495 mddev->curr_resync = 0;
6496 mddev->curr_resync_completed = 0;
6497 mddev->resync_min = 0;
6498 mddev->resync_max = MaxSector;
6499 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6500 wake_up(&resync_wait);
6501 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6502 md_wakeup_thread(mddev->thread);
6503 return;
6504
6505 interrupted:
6506 /*
6507 * got a signal, exit.
6508 */
6509 printk(KERN_INFO
6510 "md: md_do_sync() got signal ... exiting\n");
6511 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6512 goto out;
6513
6514 }
6515 EXPORT_SYMBOL_GPL(md_do_sync);
6516
6517
6518 static int remove_and_add_spares(mddev_t *mddev)
6519 {
6520 mdk_rdev_t *rdev;
6521 int spares = 0;
6522
6523 mddev->curr_resync_completed = 0;
6524
6525 list_for_each_entry(rdev, &mddev->disks, same_set)
6526 if (rdev->raid_disk >= 0 &&
6527 !test_bit(Blocked, &rdev->flags) &&
6528 (test_bit(Faulty, &rdev->flags) ||
6529 ! test_bit(In_sync, &rdev->flags)) &&
6530 atomic_read(&rdev->nr_pending)==0) {
6531 if (mddev->pers->hot_remove_disk(
6532 mddev, rdev->raid_disk)==0) {
6533 char nm[20];
6534 sprintf(nm,"rd%d", rdev->raid_disk);
6535 sysfs_remove_link(&mddev->kobj, nm);
6536 rdev->raid_disk = -1;
6537 }
6538 }
6539
6540 if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) {
6541 list_for_each_entry(rdev, &mddev->disks, same_set) {
6542 if (rdev->raid_disk >= 0 &&
6543 !test_bit(In_sync, &rdev->flags) &&
6544 !test_bit(Blocked, &rdev->flags))
6545 spares++;
6546 if (rdev->raid_disk < 0
6547 && !test_bit(Faulty, &rdev->flags)) {
6548 rdev->recovery_offset = 0;
6549 if (mddev->pers->
6550 hot_add_disk(mddev, rdev) == 0) {
6551 char nm[20];
6552 sprintf(nm, "rd%d", rdev->raid_disk);
6553 if (sysfs_create_link(&mddev->kobj,
6554 &rdev->kobj, nm))
6555 printk(KERN_WARNING
6556 "md: cannot register "
6557 "%s for %s\n",
6558 nm, mdname(mddev));
6559 spares++;
6560 md_new_event(mddev);
6561 } else
6562 break;
6563 }
6564 }
6565 }
6566 return spares;
6567 }
6568 /*
6569 * This routine is regularly called by all per-raid-array threads to
6570 * deal with generic issues like resync and super-block update.
6571 * Raid personalities that don't have a thread (linear/raid0) do not
6572 * need this as they never do any recovery or update the superblock.
6573 *
6574 * It does not do any resync itself, but rather "forks" off other threads
6575 * to do that as needed.
6576 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6577 * "->recovery" and create a thread at ->sync_thread.
6578 * When the thread finishes it sets MD_RECOVERY_DONE
6579 * and wakeups up this thread which will reap the thread and finish up.
6580 * This thread also removes any faulty devices (with nr_pending == 0).
6581 *
6582 * The overall approach is:
6583 * 1/ if the superblock needs updating, update it.
6584 * 2/ If a recovery thread is running, don't do anything else.
6585 * 3/ If recovery has finished, clean up, possibly marking spares active.
6586 * 4/ If there are any faulty devices, remove them.
6587 * 5/ If array is degraded, try to add spares devices
6588 * 6/ If array has spares or is not in-sync, start a resync thread.
6589 */
6590 void md_check_recovery(mddev_t *mddev)
6591 {
6592 mdk_rdev_t *rdev;
6593
6594
6595 if (mddev->bitmap)
6596 bitmap_daemon_work(mddev->bitmap);
6597
6598 if (mddev->ro)
6599 return;
6600
6601 if (signal_pending(current)) {
6602 if (mddev->pers->sync_request && !mddev->external) {
6603 printk(KERN_INFO "md: %s in immediate safe mode\n",
6604 mdname(mddev));
6605 mddev->safemode = 2;
6606 }
6607 flush_signals(current);
6608 }
6609
6610 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
6611 return;
6612 if ( ! (
6613 (mddev->flags && !mddev->external) ||
6614 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
6615 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
6616 (mddev->external == 0 && mddev->safemode == 1) ||
6617 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6618 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
6619 ))
6620 return;
6621
6622 if (mddev_trylock(mddev)) {
6623 int spares = 0;
6624
6625 if (mddev->ro) {
6626 /* Only thing we do on a ro array is remove
6627 * failed devices.
6628 */
6629 remove_and_add_spares(mddev);
6630 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6631 goto unlock;
6632 }
6633
6634 if (!mddev->external) {
6635 int did_change = 0;
6636 spin_lock_irq(&mddev->write_lock);
6637 if (mddev->safemode &&
6638 !atomic_read(&mddev->writes_pending) &&
6639 !mddev->in_sync &&
6640 mddev->recovery_cp == MaxSector) {
6641 mddev->in_sync = 1;
6642 did_change = 1;
6643 if (mddev->persistent)
6644 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6645 }
6646 if (mddev->safemode == 1)
6647 mddev->safemode = 0;
6648 spin_unlock_irq(&mddev->write_lock);
6649 if (did_change)
6650 sysfs_notify_dirent(mddev->sysfs_state);
6651 }
6652
6653 if (mddev->flags)
6654 md_update_sb(mddev, 0);
6655
6656 list_for_each_entry(rdev, &mddev->disks, same_set)
6657 if (test_and_clear_bit(StateChanged, &rdev->flags))
6658 sysfs_notify_dirent(rdev->sysfs_state);
6659
6660
6661 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6662 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6663 /* resync/recovery still happening */
6664 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6665 goto unlock;
6666 }
6667 if (mddev->sync_thread) {
6668 /* resync has finished, collect result */
6669 md_unregister_thread(mddev->sync_thread);
6670 mddev->sync_thread = NULL;
6671 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
6672 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
6673 /* success...*/
6674 /* activate any spares */
6675 if (mddev->pers->spare_active(mddev))
6676 sysfs_notify(&mddev->kobj, NULL,
6677 "degraded");
6678 }
6679 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6680 mddev->pers->finish_reshape)
6681 mddev->pers->finish_reshape(mddev);
6682 md_update_sb(mddev, 1);
6683
6684 /* if array is no-longer degraded, then any saved_raid_disk
6685 * information must be scrapped
6686 */
6687 if (!mddev->degraded)
6688 list_for_each_entry(rdev, &mddev->disks, same_set)
6689 rdev->saved_raid_disk = -1;
6690
6691 mddev->recovery = 0;
6692 /* flag recovery needed just to double check */
6693 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6694 sysfs_notify_dirent(mddev->sysfs_action);
6695 md_new_event(mddev);
6696 goto unlock;
6697 }
6698 /* Set RUNNING before clearing NEEDED to avoid
6699 * any transients in the value of "sync_action".
6700 */
6701 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6702 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6703 /* Clear some bits that don't mean anything, but
6704 * might be left set
6705 */
6706 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6707 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
6708
6709 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6710 goto unlock;
6711 /* no recovery is running.
6712 * remove any failed drives, then
6713 * add spares if possible.
6714 * Spare are also removed and re-added, to allow
6715 * the personality to fail the re-add.
6716 */
6717
6718 if (mddev->reshape_position != MaxSector) {
6719 if (mddev->pers->check_reshape == NULL ||
6720 mddev->pers->check_reshape(mddev) != 0)
6721 /* Cannot proceed */
6722 goto unlock;
6723 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
6724 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6725 } else if ((spares = remove_and_add_spares(mddev))) {
6726 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6727 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
6728 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
6729 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6730 } else if (mddev->recovery_cp < MaxSector) {
6731 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6732 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6733 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6734 /* nothing to be done ... */
6735 goto unlock;
6736
6737 if (mddev->pers->sync_request) {
6738 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
6739 /* We are adding a device or devices to an array
6740 * which has the bitmap stored on all devices.
6741 * So make sure all bitmap pages get written
6742 */
6743 bitmap_write_all(mddev->bitmap);
6744 }
6745 mddev->sync_thread = md_register_thread(md_do_sync,
6746 mddev,
6747 "%s_resync");
6748 if (!mddev->sync_thread) {
6749 printk(KERN_ERR "%s: could not start resync"
6750 " thread...\n",
6751 mdname(mddev));
6752 /* leave the spares where they are, it shouldn't hurt */
6753 mddev->recovery = 0;
6754 } else
6755 md_wakeup_thread(mddev->sync_thread);
6756 sysfs_notify_dirent(mddev->sysfs_action);
6757 md_new_event(mddev);
6758 }
6759 unlock:
6760 if (!mddev->sync_thread) {
6761 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6762 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
6763 &mddev->recovery))
6764 if (mddev->sysfs_action)
6765 sysfs_notify_dirent(mddev->sysfs_action);
6766 }
6767 mddev_unlock(mddev);
6768 }
6769 }
6770
6771 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
6772 {
6773 sysfs_notify_dirent(rdev->sysfs_state);
6774 wait_event_timeout(rdev->blocked_wait,
6775 !test_bit(Blocked, &rdev->flags),
6776 msecs_to_jiffies(5000));
6777 rdev_dec_pending(rdev, mddev);
6778 }
6779 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
6780
6781 static int md_notify_reboot(struct notifier_block *this,
6782 unsigned long code, void *x)
6783 {
6784 struct list_head *tmp;
6785 mddev_t *mddev;
6786
6787 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
6788
6789 printk(KERN_INFO "md: stopping all md devices.\n");
6790
6791 for_each_mddev(mddev, tmp)
6792 if (mddev_trylock(mddev)) {
6793 /* Force a switch to readonly even array
6794 * appears to still be in use. Hence
6795 * the '100'.
6796 */
6797 do_md_stop(mddev, 1, 100);
6798 mddev_unlock(mddev);
6799 }
6800 /*
6801 * certain more exotic SCSI devices are known to be
6802 * volatile wrt too early system reboots. While the
6803 * right place to handle this issue is the given
6804 * driver, we do want to have a safe RAID driver ...
6805 */
6806 mdelay(1000*1);
6807 }
6808 return NOTIFY_DONE;
6809 }
6810
6811 static struct notifier_block md_notifier = {
6812 .notifier_call = md_notify_reboot,
6813 .next = NULL,
6814 .priority = INT_MAX, /* before any real devices */
6815 };
6816
6817 static void md_geninit(void)
6818 {
6819 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
6820
6821 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
6822 }
6823
6824 static int __init md_init(void)
6825 {
6826 if (register_blkdev(MD_MAJOR, "md"))
6827 return -1;
6828 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
6829 unregister_blkdev(MD_MAJOR, "md");
6830 return -1;
6831 }
6832 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
6833 md_probe, NULL, NULL);
6834 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
6835 md_probe, NULL, NULL);
6836
6837 register_reboot_notifier(&md_notifier);
6838 raid_table_header = register_sysctl_table(raid_root_table);
6839
6840 md_geninit();
6841 return 0;
6842 }
6843
6844
6845 #ifndef MODULE
6846
6847 /*
6848 * Searches all registered partitions for autorun RAID arrays
6849 * at boot time.
6850 */
6851
6852 static LIST_HEAD(all_detected_devices);
6853 struct detected_devices_node {
6854 struct list_head list;
6855 dev_t dev;
6856 };
6857
6858 void md_autodetect_dev(dev_t dev)
6859 {
6860 struct detected_devices_node *node_detected_dev;
6861
6862 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
6863 if (node_detected_dev) {
6864 node_detected_dev->dev = dev;
6865 list_add_tail(&node_detected_dev->list, &all_detected_devices);
6866 } else {
6867 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
6868 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
6869 }
6870 }
6871
6872
6873 static void autostart_arrays(int part)
6874 {
6875 mdk_rdev_t *rdev;
6876 struct detected_devices_node *node_detected_dev;
6877 dev_t dev;
6878 int i_scanned, i_passed;
6879
6880 i_scanned = 0;
6881 i_passed = 0;
6882
6883 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
6884
6885 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6886 i_scanned++;
6887 node_detected_dev = list_entry(all_detected_devices.next,
6888 struct detected_devices_node, list);
6889 list_del(&node_detected_dev->list);
6890 dev = node_detected_dev->dev;
6891 kfree(node_detected_dev);
6892 rdev = md_import_device(dev,0, 90);
6893 if (IS_ERR(rdev))
6894 continue;
6895
6896 if (test_bit(Faulty, &rdev->flags)) {
6897 MD_BUG();
6898 continue;
6899 }
6900 set_bit(AutoDetected, &rdev->flags);
6901 list_add(&rdev->same_set, &pending_raid_disks);
6902 i_passed++;
6903 }
6904
6905 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6906 i_scanned, i_passed);
6907
6908 autorun_devices(part);
6909 }
6910
6911 #endif /* !MODULE */
6912
6913 static __exit void md_exit(void)
6914 {
6915 mddev_t *mddev;
6916 struct list_head *tmp;
6917
6918 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
6919 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
6920
6921 unregister_blkdev(MD_MAJOR,"md");
6922 unregister_blkdev(mdp_major, "mdp");
6923 unregister_reboot_notifier(&md_notifier);
6924 unregister_sysctl_table(raid_table_header);
6925 remove_proc_entry("mdstat", NULL);
6926 for_each_mddev(mddev, tmp) {
6927 export_array(mddev);
6928 mddev->hold_active = 0;
6929 }
6930 }
6931
6932 subsys_initcall(md_init);
6933 module_exit(md_exit)
6934
6935 static int get_ro(char *buffer, struct kernel_param *kp)
6936 {
6937 return sprintf(buffer, "%d", start_readonly);
6938 }
6939 static int set_ro(const char *val, struct kernel_param *kp)
6940 {
6941 char *e;
6942 int num = simple_strtoul(val, &e, 10);
6943 if (*val && (*e == '\0' || *e == '\n')) {
6944 start_readonly = num;
6945 return 0;
6946 }
6947 return -EINVAL;
6948 }
6949
6950 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6951 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6952
6953 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
6954
6955 EXPORT_SYMBOL(register_md_personality);
6956 EXPORT_SYMBOL(unregister_md_personality);
6957 EXPORT_SYMBOL(md_error);
6958 EXPORT_SYMBOL(md_done_sync);
6959 EXPORT_SYMBOL(md_write_start);
6960 EXPORT_SYMBOL(md_write_end);
6961 EXPORT_SYMBOL(md_register_thread);
6962 EXPORT_SYMBOL(md_unregister_thread);
6963 EXPORT_SYMBOL(md_wakeup_thread);
6964 EXPORT_SYMBOL(md_check_recovery);
6965 MODULE_LICENSE("GPL");
6966 MODULE_ALIAS("md");
6967 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
Support for the Chinese Samsung S3C2440 based development boards