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fs: move exportfs since it is not a networking filesystem
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / md / md.c
blob225815197a3d69fba134433ab269d0c9a255681b
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/mutex.h>
40 #include <linux/buffer_head.h> /* for invalidate_bdev */
41 #include <linux/poll.h>
42 #include <linux/ctype.h>
43 #include <linux/string.h>
44 #include <linux/hdreg.h>
45 #include <linux/proc_fs.h>
46 #include <linux/random.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
54 #include "md.h"
55 #include "bitmap.h"
56
57 #define DEBUG 0
58 #define dprintk(x...) ((void)(DEBUG && printk(x)))
59
60 static DEFINE_MUTEX(md_mutex);
61
62 #ifndef MODULE
63 static void autostart_arrays(int part);
64 #endif
65
66 static LIST_HEAD(pers_list);
67 static DEFINE_SPINLOCK(pers_lock);
68
69 static void md_print_devices(void);
70
71 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
72
73 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
74
75 /*
76 * Default number of read corrections we'll attempt on an rdev
77 * before ejecting it from the array. We divide the read error
78 * count by 2 for every hour elapsed between read errors.
79 */
80 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
81 /*
82 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
83 * is 1000 KB/sec, so the extra system load does not show up that much.
84 * Increase it if you want to have more _guaranteed_ speed. Note that
85 * the RAID driver will use the maximum available bandwidth if the IO
86 * subsystem is idle. There is also an 'absolute maximum' reconstruction
87 * speed limit - in case reconstruction slows down your system despite
88 * idle IO detection.
89 *
90 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
91 * or /sys/block/mdX/md/sync_speed_{min,max}
92 */
93
94 static int sysctl_speed_limit_min = 1000;
95 static int sysctl_speed_limit_max = 200000;
96 static inline int speed_min(mddev_t *mddev)
97 {
98 return mddev->sync_speed_min ?
99 mddev->sync_speed_min : sysctl_speed_limit_min;
100 }
101
102 static inline int speed_max(mddev_t *mddev)
103 {
104 return mddev->sync_speed_max ?
105 mddev->sync_speed_max : sysctl_speed_limit_max;
106 }
107
108 static struct ctl_table_header *raid_table_header;
109
110 static ctl_table raid_table[] = {
111 {
112 .procname = "speed_limit_min",
113 .data = &sysctl_speed_limit_min,
114 .maxlen = sizeof(int),
115 .mode = S_IRUGO|S_IWUSR,
116 .proc_handler = proc_dointvec,
117 },
118 {
119 .procname = "speed_limit_max",
120 .data = &sysctl_speed_limit_max,
121 .maxlen = sizeof(int),
122 .mode = S_IRUGO|S_IWUSR,
123 .proc_handler = proc_dointvec,
124 },
125 { }
126 };
127
128 static ctl_table raid_dir_table[] = {
129 {
130 .procname = "raid",
131 .maxlen = 0,
132 .mode = S_IRUGO|S_IXUGO,
133 .child = raid_table,
134 },
135 { }
136 };
137
138 static ctl_table raid_root_table[] = {
139 {
140 .procname = "dev",
141 .maxlen = 0,
142 .mode = 0555,
143 .child = raid_dir_table,
144 },
145 { }
146 };
147
148 static const struct block_device_operations md_fops;
149
150 static int start_readonly;
151
152 /*
153 * We have a system wide 'event count' that is incremented
154 * on any 'interesting' event, and readers of /proc/mdstat
155 * can use 'poll' or 'select' to find out when the event
156 * count increases.
157 *
158 * Events are:
159 * start array, stop array, error, add device, remove device,
160 * start build, activate spare
161 */
162 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
163 static atomic_t md_event_count;
164 void md_new_event(mddev_t *mddev)
165 {
166 atomic_inc(&md_event_count);
167 wake_up(&md_event_waiters);
168 }
169 EXPORT_SYMBOL_GPL(md_new_event);
170
171 /* Alternate version that can be called from interrupts
172 * when calling sysfs_notify isn't needed.
173 */
174 static void md_new_event_inintr(mddev_t *mddev)
175 {
176 atomic_inc(&md_event_count);
177 wake_up(&md_event_waiters);
178 }
179
180 /*
181 * Enables to iterate over all existing md arrays
182 * all_mddevs_lock protects this list.
183 */
184 static LIST_HEAD(all_mddevs);
185 static DEFINE_SPINLOCK(all_mddevs_lock);
186
187
188 /*
189 * iterates through all used mddevs in the system.
190 * We take care to grab the all_mddevs_lock whenever navigating
191 * the list, and to always hold a refcount when unlocked.
192 * Any code which breaks out of this loop while own
193 * a reference to the current mddev and must mddev_put it.
194 */
195 #define for_each_mddev(mddev,tmp) \
196 \
197 for (({ spin_lock(&all_mddevs_lock); \
198 tmp = all_mddevs.next; \
199 mddev = NULL;}); \
200 ({ if (tmp != &all_mddevs) \
201 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
202 spin_unlock(&all_mddevs_lock); \
203 if (mddev) mddev_put(mddev); \
204 mddev = list_entry(tmp, mddev_t, all_mddevs); \
205 tmp != &all_mddevs;}); \
206 ({ spin_lock(&all_mddevs_lock); \
207 tmp = tmp->next;}) \
208 )
209
210
211 /* Rather than calling directly into the personality make_request function,
212 * IO requests come here first so that we can check if the device is
213 * being suspended pending a reconfiguration.
214 * We hold a refcount over the call to ->make_request. By the time that
215 * call has finished, the bio has been linked into some internal structure
216 * and so is visible to ->quiesce(), so we don't need the refcount any more.
217 */
218 static int md_make_request(struct request_queue *q, struct bio *bio)
219 {
220 const int rw = bio_data_dir(bio);
221 mddev_t *mddev = q->queuedata;
222 int rv;
223 int cpu;
224
225 if (mddev == NULL || mddev->pers == NULL) {
226 bio_io_error(bio);
227 return 0;
228 }
229 rcu_read_lock();
230 if (mddev->suspended) {
231 DEFINE_WAIT(__wait);
232 for (;;) {
233 prepare_to_wait(&mddev->sb_wait, &__wait,
234 TASK_UNINTERRUPTIBLE);
235 if (!mddev->suspended)
236 break;
237 rcu_read_unlock();
238 schedule();
239 rcu_read_lock();
240 }
241 finish_wait(&mddev->sb_wait, &__wait);
242 }
243 atomic_inc(&mddev->active_io);
244 rcu_read_unlock();
245
246 rv = mddev->pers->make_request(mddev, bio);
247
248 cpu = part_stat_lock();
249 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
250 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
251 bio_sectors(bio));
252 part_stat_unlock();
253
254 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
255 wake_up(&mddev->sb_wait);
256
257 return rv;
258 }
259
260 /* mddev_suspend makes sure no new requests are submitted
261 * to the device, and that any requests that have been submitted
262 * are completely handled.
263 * Once ->stop is called and completes, the module will be completely
264 * unused.
265 */
266 void mddev_suspend(mddev_t *mddev)
267 {
268 BUG_ON(mddev->suspended);
269 mddev->suspended = 1;
270 synchronize_rcu();
271 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
272 mddev->pers->quiesce(mddev, 1);
273 }
274 EXPORT_SYMBOL_GPL(mddev_suspend);
275
276 void mddev_resume(mddev_t *mddev)
277 {
278 mddev->suspended = 0;
279 wake_up(&mddev->sb_wait);
280 mddev->pers->quiesce(mddev, 0);
281 }
282 EXPORT_SYMBOL_GPL(mddev_resume);
283
284 int mddev_congested(mddev_t *mddev, int bits)
285 {
286 return mddev->suspended;
287 }
288 EXPORT_SYMBOL(mddev_congested);
289
290 /*
291 * Generic flush handling for md
292 */
293
294 static void md_end_flush(struct bio *bio, int err)
295 {
296 mdk_rdev_t *rdev = bio->bi_private;
297 mddev_t *mddev = rdev->mddev;
298
299 rdev_dec_pending(rdev, mddev);
300
301 if (atomic_dec_and_test(&mddev->flush_pending)) {
302 /* The pre-request flush has finished */
303 schedule_work(&mddev->flush_work);
304 }
305 bio_put(bio);
306 }
307
308 static void submit_flushes(mddev_t *mddev)
309 {
310 mdk_rdev_t *rdev;
311
312 rcu_read_lock();
313 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
314 if (rdev->raid_disk >= 0 &&
315 !test_bit(Faulty, &rdev->flags)) {
316 /* Take two references, one is dropped
317 * when request finishes, one after
318 * we reclaim rcu_read_lock
319 */
320 struct bio *bi;
321 atomic_inc(&rdev->nr_pending);
322 atomic_inc(&rdev->nr_pending);
323 rcu_read_unlock();
324 bi = bio_alloc(GFP_KERNEL, 0);
325 bi->bi_end_io = md_end_flush;
326 bi->bi_private = rdev;
327 bi->bi_bdev = rdev->bdev;
328 atomic_inc(&mddev->flush_pending);
329 submit_bio(WRITE_FLUSH, bi);
330 rcu_read_lock();
331 rdev_dec_pending(rdev, mddev);
332 }
333 rcu_read_unlock();
334 }
335
336 static void md_submit_flush_data(struct work_struct *ws)
337 {
338 mddev_t *mddev = container_of(ws, mddev_t, flush_work);
339 struct bio *bio = mddev->flush_bio;
340
341 atomic_set(&mddev->flush_pending, 1);
342
343 if (bio->bi_size == 0)
344 /* an empty barrier - all done */
345 bio_endio(bio, 0);
346 else {
347 bio->bi_rw &= ~REQ_FLUSH;
348 if (mddev->pers->make_request(mddev, bio))
349 generic_make_request(bio);
350 }
351 if (atomic_dec_and_test(&mddev->flush_pending)) {
352 mddev->flush_bio = NULL;
353 wake_up(&mddev->sb_wait);
354 }
355 }
356
357 void md_flush_request(mddev_t *mddev, struct bio *bio)
358 {
359 spin_lock_irq(&mddev->write_lock);
360 wait_event_lock_irq(mddev->sb_wait,
361 !mddev->flush_bio,
362 mddev->write_lock, /*nothing*/);
363 mddev->flush_bio = bio;
364 spin_unlock_irq(&mddev->write_lock);
365
366 atomic_set(&mddev->flush_pending, 1);
367 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
368
369 submit_flushes(mddev);
370
371 if (atomic_dec_and_test(&mddev->flush_pending))
372 schedule_work(&mddev->flush_work);
373 }
374 EXPORT_SYMBOL(md_flush_request);
375
376 /* Support for plugging.
377 * This mirrors the plugging support in request_queue, but does not
378 * require having a whole queue
379 */
380 static void plugger_work(struct work_struct *work)
381 {
382 struct plug_handle *plug =
383 container_of(work, struct plug_handle, unplug_work);
384 plug->unplug_fn(plug);
385 }
386 static void plugger_timeout(unsigned long data)
387 {
388 struct plug_handle *plug = (void *)data;
389 kblockd_schedule_work(NULL, &plug->unplug_work);
390 }
391 void plugger_init(struct plug_handle *plug,
392 void (*unplug_fn)(struct plug_handle *))
393 {
394 plug->unplug_flag = 0;
395 plug->unplug_fn = unplug_fn;
396 init_timer(&plug->unplug_timer);
397 plug->unplug_timer.function = plugger_timeout;
398 plug->unplug_timer.data = (unsigned long)plug;
399 INIT_WORK(&plug->unplug_work, plugger_work);
400 }
401 EXPORT_SYMBOL_GPL(plugger_init);
402
403 void plugger_set_plug(struct plug_handle *plug)
404 {
405 if (!test_and_set_bit(PLUGGED_FLAG, &plug->unplug_flag))
406 mod_timer(&plug->unplug_timer, jiffies + msecs_to_jiffies(3)+1);
407 }
408 EXPORT_SYMBOL_GPL(plugger_set_plug);
409
410 int plugger_remove_plug(struct plug_handle *plug)
411 {
412 if (test_and_clear_bit(PLUGGED_FLAG, &plug->unplug_flag)) {
413 del_timer(&plug->unplug_timer);
414 return 1;
415 } else
416 return 0;
417 }
418 EXPORT_SYMBOL_GPL(plugger_remove_plug);
419
420
421 static inline mddev_t *mddev_get(mddev_t *mddev)
422 {
423 atomic_inc(&mddev->active);
424 return mddev;
425 }
426
427 static void mddev_delayed_delete(struct work_struct *ws);
428
429 static void mddev_put(mddev_t *mddev)
430 {
431 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
432 return;
433 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
434 mddev->ctime == 0 && !mddev->hold_active) {
435 /* Array is not configured at all, and not held active,
436 * so destroy it */
437 list_del(&mddev->all_mddevs);
438 if (mddev->gendisk) {
439 /* we did a probe so need to clean up.
440 * Call schedule_work inside the spinlock
441 * so that flush_scheduled_work() after
442 * mddev_find will succeed in waiting for the
443 * work to be done.
444 */
445 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
446 schedule_work(&mddev->del_work);
447 } else
448 kfree(mddev);
449 }
450 spin_unlock(&all_mddevs_lock);
451 }
452
453 void mddev_init(mddev_t *mddev)
454 {
455 mutex_init(&mddev->open_mutex);
456 mutex_init(&mddev->reconfig_mutex);
457 mutex_init(&mddev->bitmap_info.mutex);
458 INIT_LIST_HEAD(&mddev->disks);
459 INIT_LIST_HEAD(&mddev->all_mddevs);
460 init_timer(&mddev->safemode_timer);
461 atomic_set(&mddev->active, 1);
462 atomic_set(&mddev->openers, 0);
463 atomic_set(&mddev->active_io, 0);
464 spin_lock_init(&mddev->write_lock);
465 atomic_set(&mddev->flush_pending, 0);
466 init_waitqueue_head(&mddev->sb_wait);
467 init_waitqueue_head(&mddev->recovery_wait);
468 mddev->reshape_position = MaxSector;
469 mddev->resync_min = 0;
470 mddev->resync_max = MaxSector;
471 mddev->level = LEVEL_NONE;
472 }
473 EXPORT_SYMBOL_GPL(mddev_init);
474
475 static mddev_t * mddev_find(dev_t unit)
476 {
477 mddev_t *mddev, *new = NULL;
478
479 retry:
480 spin_lock(&all_mddevs_lock);
481
482 if (unit) {
483 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
484 if (mddev->unit == unit) {
485 mddev_get(mddev);
486 spin_unlock(&all_mddevs_lock);
487 kfree(new);
488 return mddev;
489 }
490
491 if (new) {
492 list_add(&new->all_mddevs, &all_mddevs);
493 spin_unlock(&all_mddevs_lock);
494 new->hold_active = UNTIL_IOCTL;
495 return new;
496 }
497 } else if (new) {
498 /* find an unused unit number */
499 static int next_minor = 512;
500 int start = next_minor;
501 int is_free = 0;
502 int dev = 0;
503 while (!is_free) {
504 dev = MKDEV(MD_MAJOR, next_minor);
505 next_minor++;
506 if (next_minor > MINORMASK)
507 next_minor = 0;
508 if (next_minor == start) {
509 /* Oh dear, all in use. */
510 spin_unlock(&all_mddevs_lock);
511 kfree(new);
512 return NULL;
513 }
514
515 is_free = 1;
516 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
517 if (mddev->unit == dev) {
518 is_free = 0;
519 break;
520 }
521 }
522 new->unit = dev;
523 new->md_minor = MINOR(dev);
524 new->hold_active = UNTIL_STOP;
525 list_add(&new->all_mddevs, &all_mddevs);
526 spin_unlock(&all_mddevs_lock);
527 return new;
528 }
529 spin_unlock(&all_mddevs_lock);
530
531 new = kzalloc(sizeof(*new), GFP_KERNEL);
532 if (!new)
533 return NULL;
534
535 new->unit = unit;
536 if (MAJOR(unit) == MD_MAJOR)
537 new->md_minor = MINOR(unit);
538 else
539 new->md_minor = MINOR(unit) >> MdpMinorShift;
540
541 mddev_init(new);
542
543 goto retry;
544 }
545
546 static inline int mddev_lock(mddev_t * mddev)
547 {
548 return mutex_lock_interruptible(&mddev->reconfig_mutex);
549 }
550
551 static inline int mddev_is_locked(mddev_t *mddev)
552 {
553 return mutex_is_locked(&mddev->reconfig_mutex);
554 }
555
556 static inline int mddev_trylock(mddev_t * mddev)
557 {
558 return mutex_trylock(&mddev->reconfig_mutex);
559 }
560
561 static struct attribute_group md_redundancy_group;
562
563 static void mddev_unlock(mddev_t * mddev)
564 {
565 if (mddev->to_remove) {
566 /* These cannot be removed under reconfig_mutex as
567 * an access to the files will try to take reconfig_mutex
568 * while holding the file unremovable, which leads to
569 * a deadlock.
570 * So hold set sysfs_active while the remove in happeing,
571 * and anything else which might set ->to_remove or my
572 * otherwise change the sysfs namespace will fail with
573 * -EBUSY if sysfs_active is still set.
574 * We set sysfs_active under reconfig_mutex and elsewhere
575 * test it under the same mutex to ensure its correct value
576 * is seen.
577 */
578 struct attribute_group *to_remove = mddev->to_remove;
579 mddev->to_remove = NULL;
580 mddev->sysfs_active = 1;
581 mutex_unlock(&mddev->reconfig_mutex);
582
583 if (mddev->kobj.sd) {
584 if (to_remove != &md_redundancy_group)
585 sysfs_remove_group(&mddev->kobj, to_remove);
586 if (mddev->pers == NULL ||
587 mddev->pers->sync_request == NULL) {
588 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
589 if (mddev->sysfs_action)
590 sysfs_put(mddev->sysfs_action);
591 mddev->sysfs_action = NULL;
592 }
593 }
594 mddev->sysfs_active = 0;
595 } else
596 mutex_unlock(&mddev->reconfig_mutex);
597
598 md_wakeup_thread(mddev->thread);
599 }
600
601 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
602 {
603 mdk_rdev_t *rdev;
604
605 list_for_each_entry(rdev, &mddev->disks, same_set)
606 if (rdev->desc_nr == nr)
607 return rdev;
608
609 return NULL;
610 }
611
612 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
613 {
614 mdk_rdev_t *rdev;
615
616 list_for_each_entry(rdev, &mddev->disks, same_set)
617 if (rdev->bdev->bd_dev == dev)
618 return rdev;
619
620 return NULL;
621 }
622
623 static struct mdk_personality *find_pers(int level, char *clevel)
624 {
625 struct mdk_personality *pers;
626 list_for_each_entry(pers, &pers_list, list) {
627 if (level != LEVEL_NONE && pers->level == level)
628 return pers;
629 if (strcmp(pers->name, clevel)==0)
630 return pers;
631 }
632 return NULL;
633 }
634
635 /* return the offset of the super block in 512byte sectors */
636 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
637 {
638 sector_t num_sectors = bdev->bd_inode->i_size / 512;
639 return MD_NEW_SIZE_SECTORS(num_sectors);
640 }
641
642 static int alloc_disk_sb(mdk_rdev_t * rdev)
643 {
644 if (rdev->sb_page)
645 MD_BUG();
646
647 rdev->sb_page = alloc_page(GFP_KERNEL);
648 if (!rdev->sb_page) {
649 printk(KERN_ALERT "md: out of memory.\n");
650 return -ENOMEM;
651 }
652
653 return 0;
654 }
655
656 static void free_disk_sb(mdk_rdev_t * rdev)
657 {
658 if (rdev->sb_page) {
659 put_page(rdev->sb_page);
660 rdev->sb_loaded = 0;
661 rdev->sb_page = NULL;
662 rdev->sb_start = 0;
663 rdev->sectors = 0;
664 }
665 }
666
667
668 static void super_written(struct bio *bio, int error)
669 {
670 mdk_rdev_t *rdev = bio->bi_private;
671 mddev_t *mddev = rdev->mddev;
672
673 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
674 printk("md: super_written gets error=%d, uptodate=%d\n",
675 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
676 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
677 md_error(mddev, rdev);
678 }
679
680 if (atomic_dec_and_test(&mddev->pending_writes))
681 wake_up(&mddev->sb_wait);
682 bio_put(bio);
683 }
684
685 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
686 sector_t sector, int size, struct page *page)
687 {
688 /* write first size bytes of page to sector of rdev
689 * Increment mddev->pending_writes before returning
690 * and decrement it on completion, waking up sb_wait
691 * if zero is reached.
692 * If an error occurred, call md_error
693 */
694 struct bio *bio = bio_alloc(GFP_NOIO, 1);
695
696 bio->bi_bdev = rdev->bdev;
697 bio->bi_sector = sector;
698 bio_add_page(bio, page, size, 0);
699 bio->bi_private = rdev;
700 bio->bi_end_io = super_written;
701
702 atomic_inc(&mddev->pending_writes);
703 submit_bio(REQ_WRITE | REQ_SYNC | REQ_UNPLUG | REQ_FLUSH | REQ_FUA,
704 bio);
705 }
706
707 void md_super_wait(mddev_t *mddev)
708 {
709 /* wait for all superblock writes that were scheduled to complete */
710 DEFINE_WAIT(wq);
711 for(;;) {
712 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
713 if (atomic_read(&mddev->pending_writes)==0)
714 break;
715 schedule();
716 }
717 finish_wait(&mddev->sb_wait, &wq);
718 }
719
720 static void bi_complete(struct bio *bio, int error)
721 {
722 complete((struct completion*)bio->bi_private);
723 }
724
725 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
726 struct page *page, int rw)
727 {
728 struct bio *bio = bio_alloc(GFP_NOIO, 1);
729 struct completion event;
730 int ret;
731
732 rw |= REQ_SYNC | REQ_UNPLUG;
733
734 bio->bi_bdev = bdev;
735 bio->bi_sector = sector;
736 bio_add_page(bio, page, size, 0);
737 init_completion(&event);
738 bio->bi_private = &event;
739 bio->bi_end_io = bi_complete;
740 submit_bio(rw, bio);
741 wait_for_completion(&event);
742
743 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
744 bio_put(bio);
745 return ret;
746 }
747 EXPORT_SYMBOL_GPL(sync_page_io);
748
749 static int read_disk_sb(mdk_rdev_t * rdev, int size)
750 {
751 char b[BDEVNAME_SIZE];
752 if (!rdev->sb_page) {
753 MD_BUG();
754 return -EINVAL;
755 }
756 if (rdev->sb_loaded)
757 return 0;
758
759
760 if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ))
761 goto fail;
762 rdev->sb_loaded = 1;
763 return 0;
764
765 fail:
766 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
767 bdevname(rdev->bdev,b));
768 return -EINVAL;
769 }
770
771 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
772 {
773 return sb1->set_uuid0 == sb2->set_uuid0 &&
774 sb1->set_uuid1 == sb2->set_uuid1 &&
775 sb1->set_uuid2 == sb2->set_uuid2 &&
776 sb1->set_uuid3 == sb2->set_uuid3;
777 }
778
779 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
780 {
781 int ret;
782 mdp_super_t *tmp1, *tmp2;
783
784 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
785 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
786
787 if (!tmp1 || !tmp2) {
788 ret = 0;
789 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
790 goto abort;
791 }
792
793 *tmp1 = *sb1;
794 *tmp2 = *sb2;
795
796 /*
797 * nr_disks is not constant
798 */
799 tmp1->nr_disks = 0;
800 tmp2->nr_disks = 0;
801
802 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
803 abort:
804 kfree(tmp1);
805 kfree(tmp2);
806 return ret;
807 }
808
809
810 static u32 md_csum_fold(u32 csum)
811 {
812 csum = (csum & 0xffff) + (csum >> 16);
813 return (csum & 0xffff) + (csum >> 16);
814 }
815
816 static unsigned int calc_sb_csum(mdp_super_t * sb)
817 {
818 u64 newcsum = 0;
819 u32 *sb32 = (u32*)sb;
820 int i;
821 unsigned int disk_csum, csum;
822
823 disk_csum = sb->sb_csum;
824 sb->sb_csum = 0;
825
826 for (i = 0; i < MD_SB_BYTES/4 ; i++)
827 newcsum += sb32[i];
828 csum = (newcsum & 0xffffffff) + (newcsum>>32);
829
830
831 #ifdef CONFIG_ALPHA
832 /* This used to use csum_partial, which was wrong for several
833 * reasons including that different results are returned on
834 * different architectures. It isn't critical that we get exactly
835 * the same return value as before (we always csum_fold before
836 * testing, and that removes any differences). However as we
837 * know that csum_partial always returned a 16bit value on
838 * alphas, do a fold to maximise conformity to previous behaviour.
839 */
840 sb->sb_csum = md_csum_fold(disk_csum);
841 #else
842 sb->sb_csum = disk_csum;
843 #endif
844 return csum;
845 }
846
847
848 /*
849 * Handle superblock details.
850 * We want to be able to handle multiple superblock formats
851 * so we have a common interface to them all, and an array of
852 * different handlers.
853 * We rely on user-space to write the initial superblock, and support
854 * reading and updating of superblocks.
855 * Interface methods are:
856 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
857 * loads and validates a superblock on dev.
858 * if refdev != NULL, compare superblocks on both devices
859 * Return:
860 * 0 - dev has a superblock that is compatible with refdev
861 * 1 - dev has a superblock that is compatible and newer than refdev
862 * so dev should be used as the refdev in future
863 * -EINVAL superblock incompatible or invalid
864 * -othererror e.g. -EIO
865 *
866 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
867 * Verify that dev is acceptable into mddev.
868 * The first time, mddev->raid_disks will be 0, and data from
869 * dev should be merged in. Subsequent calls check that dev
870 * is new enough. Return 0 or -EINVAL
871 *
872 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
873 * Update the superblock for rdev with data in mddev
874 * This does not write to disc.
875 *
876 */
877
878 struct super_type {
879 char *name;
880 struct module *owner;
881 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
882 int minor_version);
883 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
884 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
885 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
886 sector_t num_sectors);
887 };
888
889 /*
890 * Check that the given mddev has no bitmap.
891 *
892 * This function is called from the run method of all personalities that do not
893 * support bitmaps. It prints an error message and returns non-zero if mddev
894 * has a bitmap. Otherwise, it returns 0.
895 *
896 */
897 int md_check_no_bitmap(mddev_t *mddev)
898 {
899 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
900 return 0;
901 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
902 mdname(mddev), mddev->pers->name);
903 return 1;
904 }
905 EXPORT_SYMBOL(md_check_no_bitmap);
906
907 /*
908 * load_super for 0.90.0
909 */
910 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
911 {
912 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
913 mdp_super_t *sb;
914 int ret;
915
916 /*
917 * Calculate the position of the superblock (512byte sectors),
918 * it's at the end of the disk.
919 *
920 * It also happens to be a multiple of 4Kb.
921 */
922 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
923
924 ret = read_disk_sb(rdev, MD_SB_BYTES);
925 if (ret) return ret;
926
927 ret = -EINVAL;
928
929 bdevname(rdev->bdev, b);
930 sb = (mdp_super_t*)page_address(rdev->sb_page);
931
932 if (sb->md_magic != MD_SB_MAGIC) {
933 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
934 b);
935 goto abort;
936 }
937
938 if (sb->major_version != 0 ||
939 sb->minor_version < 90 ||
940 sb->minor_version > 91) {
941 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
942 sb->major_version, sb->minor_version,
943 b);
944 goto abort;
945 }
946
947 if (sb->raid_disks <= 0)
948 goto abort;
949
950 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
951 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
952 b);
953 goto abort;
954 }
955
956 rdev->preferred_minor = sb->md_minor;
957 rdev->data_offset = 0;
958 rdev->sb_size = MD_SB_BYTES;
959
960 if (sb->level == LEVEL_MULTIPATH)
961 rdev->desc_nr = -1;
962 else
963 rdev->desc_nr = sb->this_disk.number;
964
965 if (!refdev) {
966 ret = 1;
967 } else {
968 __u64 ev1, ev2;
969 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
970 if (!uuid_equal(refsb, sb)) {
971 printk(KERN_WARNING "md: %s has different UUID to %s\n",
972 b, bdevname(refdev->bdev,b2));
973 goto abort;
974 }
975 if (!sb_equal(refsb, sb)) {
976 printk(KERN_WARNING "md: %s has same UUID"
977 " but different superblock to %s\n",
978 b, bdevname(refdev->bdev, b2));
979 goto abort;
980 }
981 ev1 = md_event(sb);
982 ev2 = md_event(refsb);
983 if (ev1 > ev2)
984 ret = 1;
985 else
986 ret = 0;
987 }
988 rdev->sectors = rdev->sb_start;
989
990 if (rdev->sectors < sb->size * 2 && sb->level > 1)
991 /* "this cannot possibly happen" ... */
992 ret = -EINVAL;
993
994 abort:
995 return ret;
996 }
997
998 /*
999 * validate_super for 0.90.0
1000 */
1001 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1002 {
1003 mdp_disk_t *desc;
1004 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
1005 __u64 ev1 = md_event(sb);
1006
1007 rdev->raid_disk = -1;
1008 clear_bit(Faulty, &rdev->flags);
1009 clear_bit(In_sync, &rdev->flags);
1010 clear_bit(WriteMostly, &rdev->flags);
1011
1012 if (mddev->raid_disks == 0) {
1013 mddev->major_version = 0;
1014 mddev->minor_version = sb->minor_version;
1015 mddev->patch_version = sb->patch_version;
1016 mddev->external = 0;
1017 mddev->chunk_sectors = sb->chunk_size >> 9;
1018 mddev->ctime = sb->ctime;
1019 mddev->utime = sb->utime;
1020 mddev->level = sb->level;
1021 mddev->clevel[0] = 0;
1022 mddev->layout = sb->layout;
1023 mddev->raid_disks = sb->raid_disks;
1024 mddev->dev_sectors = sb->size * 2;
1025 mddev->events = ev1;
1026 mddev->bitmap_info.offset = 0;
1027 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1028
1029 if (mddev->minor_version >= 91) {
1030 mddev->reshape_position = sb->reshape_position;
1031 mddev->delta_disks = sb->delta_disks;
1032 mddev->new_level = sb->new_level;
1033 mddev->new_layout = sb->new_layout;
1034 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1035 } else {
1036 mddev->reshape_position = MaxSector;
1037 mddev->delta_disks = 0;
1038 mddev->new_level = mddev->level;
1039 mddev->new_layout = mddev->layout;
1040 mddev->new_chunk_sectors = mddev->chunk_sectors;
1041 }
1042
1043 if (sb->state & (1<<MD_SB_CLEAN))
1044 mddev->recovery_cp = MaxSector;
1045 else {
1046 if (sb->events_hi == sb->cp_events_hi &&
1047 sb->events_lo == sb->cp_events_lo) {
1048 mddev->recovery_cp = sb->recovery_cp;
1049 } else
1050 mddev->recovery_cp = 0;
1051 }
1052
1053 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1054 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1055 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1056 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1057
1058 mddev->max_disks = MD_SB_DISKS;
1059
1060 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1061 mddev->bitmap_info.file == NULL)
1062 mddev->bitmap_info.offset =
1063 mddev->bitmap_info.default_offset;
1064
1065 } else if (mddev->pers == NULL) {
1066 /* Insist on good event counter while assembling, except
1067 * for spares (which don't need an event count) */
1068 ++ev1;
1069 if (sb->disks[rdev->desc_nr].state & (
1070 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1071 if (ev1 < mddev->events)
1072 return -EINVAL;
1073 } else if (mddev->bitmap) {
1074 /* if adding to array with a bitmap, then we can accept an
1075 * older device ... but not too old.
1076 */
1077 if (ev1 < mddev->bitmap->events_cleared)
1078 return 0;
1079 } else {
1080 if (ev1 < mddev->events)
1081 /* just a hot-add of a new device, leave raid_disk at -1 */
1082 return 0;
1083 }
1084
1085 if (mddev->level != LEVEL_MULTIPATH) {
1086 desc = sb->disks + rdev->desc_nr;
1087
1088 if (desc->state & (1<<MD_DISK_FAULTY))
1089 set_bit(Faulty, &rdev->flags);
1090 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1091 desc->raid_disk < mddev->raid_disks */) {
1092 set_bit(In_sync, &rdev->flags);
1093 rdev->raid_disk = desc->raid_disk;
1094 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1095 /* active but not in sync implies recovery up to
1096 * reshape position. We don't know exactly where
1097 * that is, so set to zero for now */
1098 if (mddev->minor_version >= 91) {
1099 rdev->recovery_offset = 0;
1100 rdev->raid_disk = desc->raid_disk;
1101 }
1102 }
1103 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1104 set_bit(WriteMostly, &rdev->flags);
1105 } else /* MULTIPATH are always insync */
1106 set_bit(In_sync, &rdev->flags);
1107 return 0;
1108 }
1109
1110 /*
1111 * sync_super for 0.90.0
1112 */
1113 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1114 {
1115 mdp_super_t *sb;
1116 mdk_rdev_t *rdev2;
1117 int next_spare = mddev->raid_disks;
1118
1119
1120 /* make rdev->sb match mddev data..
1121 *
1122 * 1/ zero out disks
1123 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1124 * 3/ any empty disks < next_spare become removed
1125 *
1126 * disks[0] gets initialised to REMOVED because
1127 * we cannot be sure from other fields if it has
1128 * been initialised or not.
1129 */
1130 int i;
1131 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1132
1133 rdev->sb_size = MD_SB_BYTES;
1134
1135 sb = (mdp_super_t*)page_address(rdev->sb_page);
1136
1137 memset(sb, 0, sizeof(*sb));
1138
1139 sb->md_magic = MD_SB_MAGIC;
1140 sb->major_version = mddev->major_version;
1141 sb->patch_version = mddev->patch_version;
1142 sb->gvalid_words = 0; /* ignored */
1143 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1144 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1145 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1146 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1147
1148 sb->ctime = mddev->ctime;
1149 sb->level = mddev->level;
1150 sb->size = mddev->dev_sectors / 2;
1151 sb->raid_disks = mddev->raid_disks;
1152 sb->md_minor = mddev->md_minor;
1153 sb->not_persistent = 0;
1154 sb->utime = mddev->utime;
1155 sb->state = 0;
1156 sb->events_hi = (mddev->events>>32);
1157 sb->events_lo = (u32)mddev->events;
1158
1159 if (mddev->reshape_position == MaxSector)
1160 sb->minor_version = 90;
1161 else {
1162 sb->minor_version = 91;
1163 sb->reshape_position = mddev->reshape_position;
1164 sb->new_level = mddev->new_level;
1165 sb->delta_disks = mddev->delta_disks;
1166 sb->new_layout = mddev->new_layout;
1167 sb->new_chunk = mddev->new_chunk_sectors << 9;
1168 }
1169 mddev->minor_version = sb->minor_version;
1170 if (mddev->in_sync)
1171 {
1172 sb->recovery_cp = mddev->recovery_cp;
1173 sb->cp_events_hi = (mddev->events>>32);
1174 sb->cp_events_lo = (u32)mddev->events;
1175 if (mddev->recovery_cp == MaxSector)
1176 sb->state = (1<< MD_SB_CLEAN);
1177 } else
1178 sb->recovery_cp = 0;
1179
1180 sb->layout = mddev->layout;
1181 sb->chunk_size = mddev->chunk_sectors << 9;
1182
1183 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1184 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1185
1186 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1187 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1188 mdp_disk_t *d;
1189 int desc_nr;
1190 int is_active = test_bit(In_sync, &rdev2->flags);
1191
1192 if (rdev2->raid_disk >= 0 &&
1193 sb->minor_version >= 91)
1194 /* we have nowhere to store the recovery_offset,
1195 * but if it is not below the reshape_position,
1196 * we can piggy-back on that.
1197 */
1198 is_active = 1;
1199 if (rdev2->raid_disk < 0 ||
1200 test_bit(Faulty, &rdev2->flags))
1201 is_active = 0;
1202 if (is_active)
1203 desc_nr = rdev2->raid_disk;
1204 else
1205 desc_nr = next_spare++;
1206 rdev2->desc_nr = desc_nr;
1207 d = &sb->disks[rdev2->desc_nr];
1208 nr_disks++;
1209 d->number = rdev2->desc_nr;
1210 d->major = MAJOR(rdev2->bdev->bd_dev);
1211 d->minor = MINOR(rdev2->bdev->bd_dev);
1212 if (is_active)
1213 d->raid_disk = rdev2->raid_disk;
1214 else
1215 d->raid_disk = rdev2->desc_nr; /* compatibility */
1216 if (test_bit(Faulty, &rdev2->flags))
1217 d->state = (1<<MD_DISK_FAULTY);
1218 else if (is_active) {
1219 d->state = (1<<MD_DISK_ACTIVE);
1220 if (test_bit(In_sync, &rdev2->flags))
1221 d->state |= (1<<MD_DISK_SYNC);
1222 active++;
1223 working++;
1224 } else {
1225 d->state = 0;
1226 spare++;
1227 working++;
1228 }
1229 if (test_bit(WriteMostly, &rdev2->flags))
1230 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1231 }
1232 /* now set the "removed" and "faulty" bits on any missing devices */
1233 for (i=0 ; i < mddev->raid_disks ; i++) {
1234 mdp_disk_t *d = &sb->disks[i];
1235 if (d->state == 0 && d->number == 0) {
1236 d->number = i;
1237 d->raid_disk = i;
1238 d->state = (1<<MD_DISK_REMOVED);
1239 d->state |= (1<<MD_DISK_FAULTY);
1240 failed++;
1241 }
1242 }
1243 sb->nr_disks = nr_disks;
1244 sb->active_disks = active;
1245 sb->working_disks = working;
1246 sb->failed_disks = failed;
1247 sb->spare_disks = spare;
1248
1249 sb->this_disk = sb->disks[rdev->desc_nr];
1250 sb->sb_csum = calc_sb_csum(sb);
1251 }
1252
1253 /*
1254 * rdev_size_change for 0.90.0
1255 */
1256 static unsigned long long
1257 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1258 {
1259 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1260 return 0; /* component must fit device */
1261 if (rdev->mddev->bitmap_info.offset)
1262 return 0; /* can't move bitmap */
1263 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
1264 if (!num_sectors || num_sectors > rdev->sb_start)
1265 num_sectors = rdev->sb_start;
1266 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1267 rdev->sb_page);
1268 md_super_wait(rdev->mddev);
1269 return num_sectors / 2; /* kB for sysfs */
1270 }
1271
1272
1273 /*
1274 * version 1 superblock
1275 */
1276
1277 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1278 {
1279 __le32 disk_csum;
1280 u32 csum;
1281 unsigned long long newcsum;
1282 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1283 __le32 *isuper = (__le32*)sb;
1284 int i;
1285
1286 disk_csum = sb->sb_csum;
1287 sb->sb_csum = 0;
1288 newcsum = 0;
1289 for (i=0; size>=4; size -= 4 )
1290 newcsum += le32_to_cpu(*isuper++);
1291
1292 if (size == 2)
1293 newcsum += le16_to_cpu(*(__le16*) isuper);
1294
1295 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1296 sb->sb_csum = disk_csum;
1297 return cpu_to_le32(csum);
1298 }
1299
1300 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1301 {
1302 struct mdp_superblock_1 *sb;
1303 int ret;
1304 sector_t sb_start;
1305 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1306 int bmask;
1307
1308 /*
1309 * Calculate the position of the superblock in 512byte sectors.
1310 * It is always aligned to a 4K boundary and
1311 * depeding on minor_version, it can be:
1312 * 0: At least 8K, but less than 12K, from end of device
1313 * 1: At start of device
1314 * 2: 4K from start of device.
1315 */
1316 switch(minor_version) {
1317 case 0:
1318 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1319 sb_start -= 8*2;
1320 sb_start &= ~(sector_t)(4*2-1);
1321 break;
1322 case 1:
1323 sb_start = 0;
1324 break;
1325 case 2:
1326 sb_start = 8;
1327 break;
1328 default:
1329 return -EINVAL;
1330 }
1331 rdev->sb_start = sb_start;
1332
1333 /* superblock is rarely larger than 1K, but it can be larger,
1334 * and it is safe to read 4k, so we do that
1335 */
1336 ret = read_disk_sb(rdev, 4096);
1337 if (ret) return ret;
1338
1339
1340 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1341
1342 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1343 sb->major_version != cpu_to_le32(1) ||
1344 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1345 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1346 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1347 return -EINVAL;
1348
1349 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1350 printk("md: invalid superblock checksum on %s\n",
1351 bdevname(rdev->bdev,b));
1352 return -EINVAL;
1353 }
1354 if (le64_to_cpu(sb->data_size) < 10) {
1355 printk("md: data_size too small on %s\n",
1356 bdevname(rdev->bdev,b));
1357 return -EINVAL;
1358 }
1359
1360 rdev->preferred_minor = 0xffff;
1361 rdev->data_offset = le64_to_cpu(sb->data_offset);
1362 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1363
1364 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1365 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1366 if (rdev->sb_size & bmask)
1367 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1368
1369 if (minor_version
1370 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1371 return -EINVAL;
1372
1373 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1374 rdev->desc_nr = -1;
1375 else
1376 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1377
1378 if (!refdev) {
1379 ret = 1;
1380 } else {
1381 __u64 ev1, ev2;
1382 struct mdp_superblock_1 *refsb =
1383 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1384
1385 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1386 sb->level != refsb->level ||
1387 sb->layout != refsb->layout ||
1388 sb->chunksize != refsb->chunksize) {
1389 printk(KERN_WARNING "md: %s has strangely different"
1390 " superblock to %s\n",
1391 bdevname(rdev->bdev,b),
1392 bdevname(refdev->bdev,b2));
1393 return -EINVAL;
1394 }
1395 ev1 = le64_to_cpu(sb->events);
1396 ev2 = le64_to_cpu(refsb->events);
1397
1398 if (ev1 > ev2)
1399 ret = 1;
1400 else
1401 ret = 0;
1402 }
1403 if (minor_version)
1404 rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) -
1405 le64_to_cpu(sb->data_offset);
1406 else
1407 rdev->sectors = rdev->sb_start;
1408 if (rdev->sectors < le64_to_cpu(sb->data_size))
1409 return -EINVAL;
1410 rdev->sectors = le64_to_cpu(sb->data_size);
1411 if (le64_to_cpu(sb->size) > rdev->sectors)
1412 return -EINVAL;
1413 return ret;
1414 }
1415
1416 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1417 {
1418 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1419 __u64 ev1 = le64_to_cpu(sb->events);
1420
1421 rdev->raid_disk = -1;
1422 clear_bit(Faulty, &rdev->flags);
1423 clear_bit(In_sync, &rdev->flags);
1424 clear_bit(WriteMostly, &rdev->flags);
1425
1426 if (mddev->raid_disks == 0) {
1427 mddev->major_version = 1;
1428 mddev->patch_version = 0;
1429 mddev->external = 0;
1430 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1431 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1432 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1433 mddev->level = le32_to_cpu(sb->level);
1434 mddev->clevel[0] = 0;
1435 mddev->layout = le32_to_cpu(sb->layout);
1436 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1437 mddev->dev_sectors = le64_to_cpu(sb->size);
1438 mddev->events = ev1;
1439 mddev->bitmap_info.offset = 0;
1440 mddev->bitmap_info.default_offset = 1024 >> 9;
1441
1442 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1443 memcpy(mddev->uuid, sb->set_uuid, 16);
1444
1445 mddev->max_disks = (4096-256)/2;
1446
1447 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1448 mddev->bitmap_info.file == NULL )
1449 mddev->bitmap_info.offset =
1450 (__s32)le32_to_cpu(sb->bitmap_offset);
1451
1452 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1453 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1454 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1455 mddev->new_level = le32_to_cpu(sb->new_level);
1456 mddev->new_layout = le32_to_cpu(sb->new_layout);
1457 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1458 } else {
1459 mddev->reshape_position = MaxSector;
1460 mddev->delta_disks = 0;
1461 mddev->new_level = mddev->level;
1462 mddev->new_layout = mddev->layout;
1463 mddev->new_chunk_sectors = mddev->chunk_sectors;
1464 }
1465
1466 } else if (mddev->pers == NULL) {
1467 /* Insist of good event counter while assembling, except for
1468 * spares (which don't need an event count) */
1469 ++ev1;
1470 if (rdev->desc_nr >= 0 &&
1471 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1472 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1473 if (ev1 < mddev->events)
1474 return -EINVAL;
1475 } else if (mddev->bitmap) {
1476 /* If adding to array with a bitmap, then we can accept an
1477 * older device, but not too old.
1478 */
1479 if (ev1 < mddev->bitmap->events_cleared)
1480 return 0;
1481 } else {
1482 if (ev1 < mddev->events)
1483 /* just a hot-add of a new device, leave raid_disk at -1 */
1484 return 0;
1485 }
1486 if (mddev->level != LEVEL_MULTIPATH) {
1487 int role;
1488 if (rdev->desc_nr < 0 ||
1489 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1490 role = 0xffff;
1491 rdev->desc_nr = -1;
1492 } else
1493 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1494 switch(role) {
1495 case 0xffff: /* spare */
1496 break;
1497 case 0xfffe: /* faulty */
1498 set_bit(Faulty, &rdev->flags);
1499 break;
1500 default:
1501 if ((le32_to_cpu(sb->feature_map) &
1502 MD_FEATURE_RECOVERY_OFFSET))
1503 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1504 else
1505 set_bit(In_sync, &rdev->flags);
1506 rdev->raid_disk = role;
1507 break;
1508 }
1509 if (sb->devflags & WriteMostly1)
1510 set_bit(WriteMostly, &rdev->flags);
1511 } else /* MULTIPATH are always insync */
1512 set_bit(In_sync, &rdev->flags);
1513
1514 return 0;
1515 }
1516
1517 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1518 {
1519 struct mdp_superblock_1 *sb;
1520 mdk_rdev_t *rdev2;
1521 int max_dev, i;
1522 /* make rdev->sb match mddev and rdev data. */
1523
1524 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1525
1526 sb->feature_map = 0;
1527 sb->pad0 = 0;
1528 sb->recovery_offset = cpu_to_le64(0);
1529 memset(sb->pad1, 0, sizeof(sb->pad1));
1530 memset(sb->pad2, 0, sizeof(sb->pad2));
1531 memset(sb->pad3, 0, sizeof(sb->pad3));
1532
1533 sb->utime = cpu_to_le64((__u64)mddev->utime);
1534 sb->events = cpu_to_le64(mddev->events);
1535 if (mddev->in_sync)
1536 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1537 else
1538 sb->resync_offset = cpu_to_le64(0);
1539
1540 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1541
1542 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1543 sb->size = cpu_to_le64(mddev->dev_sectors);
1544 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1545 sb->level = cpu_to_le32(mddev->level);
1546 sb->layout = cpu_to_le32(mddev->layout);
1547
1548 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1549 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1550 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1551 }
1552
1553 if (rdev->raid_disk >= 0 &&
1554 !test_bit(In_sync, &rdev->flags)) {
1555 sb->feature_map |=
1556 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1557 sb->recovery_offset =
1558 cpu_to_le64(rdev->recovery_offset);
1559 }
1560
1561 if (mddev->reshape_position != MaxSector) {
1562 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1563 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1564 sb->new_layout = cpu_to_le32(mddev->new_layout);
1565 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1566 sb->new_level = cpu_to_le32(mddev->new_level);
1567 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1568 }
1569
1570 max_dev = 0;
1571 list_for_each_entry(rdev2, &mddev->disks, same_set)
1572 if (rdev2->desc_nr+1 > max_dev)
1573 max_dev = rdev2->desc_nr+1;
1574
1575 if (max_dev > le32_to_cpu(sb->max_dev)) {
1576 int bmask;
1577 sb->max_dev = cpu_to_le32(max_dev);
1578 rdev->sb_size = max_dev * 2 + 256;
1579 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1580 if (rdev->sb_size & bmask)
1581 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1582 } else
1583 max_dev = le32_to_cpu(sb->max_dev);
1584
1585 for (i=0; i<max_dev;i++)
1586 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1587
1588 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1589 i = rdev2->desc_nr;
1590 if (test_bit(Faulty, &rdev2->flags))
1591 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1592 else if (test_bit(In_sync, &rdev2->flags))
1593 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1594 else if (rdev2->raid_disk >= 0)
1595 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1596 else
1597 sb->dev_roles[i] = cpu_to_le16(0xffff);
1598 }
1599
1600 sb->sb_csum = calc_sb_1_csum(sb);
1601 }
1602
1603 static unsigned long long
1604 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1605 {
1606 struct mdp_superblock_1 *sb;
1607 sector_t max_sectors;
1608 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1609 return 0; /* component must fit device */
1610 if (rdev->sb_start < rdev->data_offset) {
1611 /* minor versions 1 and 2; superblock before data */
1612 max_sectors = rdev->bdev->bd_inode->i_size >> 9;
1613 max_sectors -= rdev->data_offset;
1614 if (!num_sectors || num_sectors > max_sectors)
1615 num_sectors = max_sectors;
1616 } else if (rdev->mddev->bitmap_info.offset) {
1617 /* minor version 0 with bitmap we can't move */
1618 return 0;
1619 } else {
1620 /* minor version 0; superblock after data */
1621 sector_t sb_start;
1622 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1623 sb_start &= ~(sector_t)(4*2 - 1);
1624 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1625 if (!num_sectors || num_sectors > max_sectors)
1626 num_sectors = max_sectors;
1627 rdev->sb_start = sb_start;
1628 }
1629 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1630 sb->data_size = cpu_to_le64(num_sectors);
1631 sb->super_offset = rdev->sb_start;
1632 sb->sb_csum = calc_sb_1_csum(sb);
1633 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1634 rdev->sb_page);
1635 md_super_wait(rdev->mddev);
1636 return num_sectors / 2; /* kB for sysfs */
1637 }
1638
1639 static struct super_type super_types[] = {
1640 [0] = {
1641 .name = "0.90.0",
1642 .owner = THIS_MODULE,
1643 .load_super = super_90_load,
1644 .validate_super = super_90_validate,
1645 .sync_super = super_90_sync,
1646 .rdev_size_change = super_90_rdev_size_change,
1647 },
1648 [1] = {
1649 .name = "md-1",
1650 .owner = THIS_MODULE,
1651 .load_super = super_1_load,
1652 .validate_super = super_1_validate,
1653 .sync_super = super_1_sync,
1654 .rdev_size_change = super_1_rdev_size_change,
1655 },
1656 };
1657
1658 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1659 {
1660 mdk_rdev_t *rdev, *rdev2;
1661
1662 rcu_read_lock();
1663 rdev_for_each_rcu(rdev, mddev1)
1664 rdev_for_each_rcu(rdev2, mddev2)
1665 if (rdev->bdev->bd_contains ==
1666 rdev2->bdev->bd_contains) {
1667 rcu_read_unlock();
1668 return 1;
1669 }
1670 rcu_read_unlock();
1671 return 0;
1672 }
1673
1674 static LIST_HEAD(pending_raid_disks);
1675
1676 /*
1677 * Try to register data integrity profile for an mddev
1678 *
1679 * This is called when an array is started and after a disk has been kicked
1680 * from the array. It only succeeds if all working and active component devices
1681 * are integrity capable with matching profiles.
1682 */
1683 int md_integrity_register(mddev_t *mddev)
1684 {
1685 mdk_rdev_t *rdev, *reference = NULL;
1686
1687 if (list_empty(&mddev->disks))
1688 return 0; /* nothing to do */
1689 if (blk_get_integrity(mddev->gendisk))
1690 return 0; /* already registered */
1691 list_for_each_entry(rdev, &mddev->disks, same_set) {
1692 /* skip spares and non-functional disks */
1693 if (test_bit(Faulty, &rdev->flags))
1694 continue;
1695 if (rdev->raid_disk < 0)
1696 continue;
1697 /*
1698 * If at least one rdev is not integrity capable, we can not
1699 * enable data integrity for the md device.
1700 */
1701 if (!bdev_get_integrity(rdev->bdev))
1702 return -EINVAL;
1703 if (!reference) {
1704 /* Use the first rdev as the reference */
1705 reference = rdev;
1706 continue;
1707 }
1708 /* does this rdev's profile match the reference profile? */
1709 if (blk_integrity_compare(reference->bdev->bd_disk,
1710 rdev->bdev->bd_disk) < 0)
1711 return -EINVAL;
1712 }
1713 /*
1714 * All component devices are integrity capable and have matching
1715 * profiles, register the common profile for the md device.
1716 */
1717 if (blk_integrity_register(mddev->gendisk,
1718 bdev_get_integrity(reference->bdev)) != 0) {
1719 printk(KERN_ERR "md: failed to register integrity for %s\n",
1720 mdname(mddev));
1721 return -EINVAL;
1722 }
1723 printk(KERN_NOTICE "md: data integrity on %s enabled\n",
1724 mdname(mddev));
1725 return 0;
1726 }
1727 EXPORT_SYMBOL(md_integrity_register);
1728
1729 /* Disable data integrity if non-capable/non-matching disk is being added */
1730 void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
1731 {
1732 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1733 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
1734
1735 if (!bi_mddev) /* nothing to do */
1736 return;
1737 if (rdev->raid_disk < 0) /* skip spares */
1738 return;
1739 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1740 rdev->bdev->bd_disk) >= 0)
1741 return;
1742 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
1743 blk_integrity_unregister(mddev->gendisk);
1744 }
1745 EXPORT_SYMBOL(md_integrity_add_rdev);
1746
1747 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1748 {
1749 char b[BDEVNAME_SIZE];
1750 struct kobject *ko;
1751 char *s;
1752 int err;
1753
1754 if (rdev->mddev) {
1755 MD_BUG();
1756 return -EINVAL;
1757 }
1758
1759 /* prevent duplicates */
1760 if (find_rdev(mddev, rdev->bdev->bd_dev))
1761 return -EEXIST;
1762
1763 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1764 if (rdev->sectors && (mddev->dev_sectors == 0 ||
1765 rdev->sectors < mddev->dev_sectors)) {
1766 if (mddev->pers) {
1767 /* Cannot change size, so fail
1768 * If mddev->level <= 0, then we don't care
1769 * about aligning sizes (e.g. linear)
1770 */
1771 if (mddev->level > 0)
1772 return -ENOSPC;
1773 } else
1774 mddev->dev_sectors = rdev->sectors;
1775 }
1776
1777 /* Verify rdev->desc_nr is unique.
1778 * If it is -1, assign a free number, else
1779 * check number is not in use
1780 */
1781 if (rdev->desc_nr < 0) {
1782 int choice = 0;
1783 if (mddev->pers) choice = mddev->raid_disks;
1784 while (find_rdev_nr(mddev, choice))
1785 choice++;
1786 rdev->desc_nr = choice;
1787 } else {
1788 if (find_rdev_nr(mddev, rdev->desc_nr))
1789 return -EBUSY;
1790 }
1791 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1792 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1793 mdname(mddev), mddev->max_disks);
1794 return -EBUSY;
1795 }
1796 bdevname(rdev->bdev,b);
1797 while ( (s=strchr(b, '/')) != NULL)
1798 *s = '!';
1799
1800 rdev->mddev = mddev;
1801 printk(KERN_INFO "md: bind<%s>\n", b);
1802
1803 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1804 goto fail;
1805
1806 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1807 if (sysfs_create_link(&rdev->kobj, ko, "block"))
1808 /* failure here is OK */;
1809 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
1810
1811 list_add_rcu(&rdev->same_set, &mddev->disks);
1812 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1813
1814 /* May as well allow recovery to be retried once */
1815 mddev->recovery_disabled = 0;
1816
1817 return 0;
1818
1819 fail:
1820 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1821 b, mdname(mddev));
1822 return err;
1823 }
1824
1825 static void md_delayed_delete(struct work_struct *ws)
1826 {
1827 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1828 kobject_del(&rdev->kobj);
1829 kobject_put(&rdev->kobj);
1830 }
1831
1832 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1833 {
1834 char b[BDEVNAME_SIZE];
1835 if (!rdev->mddev) {
1836 MD_BUG();
1837 return;
1838 }
1839 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1840 list_del_rcu(&rdev->same_set);
1841 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1842 rdev->mddev = NULL;
1843 sysfs_remove_link(&rdev->kobj, "block");
1844 sysfs_put(rdev->sysfs_state);
1845 rdev->sysfs_state = NULL;
1846 /* We need to delay this, otherwise we can deadlock when
1847 * writing to 'remove' to "dev/state". We also need
1848 * to delay it due to rcu usage.
1849 */
1850 synchronize_rcu();
1851 INIT_WORK(&rdev->del_work, md_delayed_delete);
1852 kobject_get(&rdev->kobj);
1853 schedule_work(&rdev->del_work);
1854 }
1855
1856 /*
1857 * prevent the device from being mounted, repartitioned or
1858 * otherwise reused by a RAID array (or any other kernel
1859 * subsystem), by bd_claiming the device.
1860 */
1861 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1862 {
1863 int err = 0;
1864 struct block_device *bdev;
1865 char b[BDEVNAME_SIZE];
1866
1867 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1868 if (IS_ERR(bdev)) {
1869 printk(KERN_ERR "md: could not open %s.\n",
1870 __bdevname(dev, b));
1871 return PTR_ERR(bdev);
1872 }
1873 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1874 if (err) {
1875 printk(KERN_ERR "md: could not bd_claim %s.\n",
1876 bdevname(bdev, b));
1877 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1878 return err;
1879 }
1880 if (!shared)
1881 set_bit(AllReserved, &rdev->flags);
1882 rdev->bdev = bdev;
1883 return err;
1884 }
1885
1886 static void unlock_rdev(mdk_rdev_t *rdev)
1887 {
1888 struct block_device *bdev = rdev->bdev;
1889 rdev->bdev = NULL;
1890 if (!bdev)
1891 MD_BUG();
1892 bd_release(bdev);
1893 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1894 }
1895
1896 void md_autodetect_dev(dev_t dev);
1897
1898 static void export_rdev(mdk_rdev_t * rdev)
1899 {
1900 char b[BDEVNAME_SIZE];
1901 printk(KERN_INFO "md: export_rdev(%s)\n",
1902 bdevname(rdev->bdev,b));
1903 if (rdev->mddev)
1904 MD_BUG();
1905 free_disk_sb(rdev);
1906 #ifndef MODULE
1907 if (test_bit(AutoDetected, &rdev->flags))
1908 md_autodetect_dev(rdev->bdev->bd_dev);
1909 #endif
1910 unlock_rdev(rdev);
1911 kobject_put(&rdev->kobj);
1912 }
1913
1914 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1915 {
1916 unbind_rdev_from_array(rdev);
1917 export_rdev(rdev);
1918 }
1919
1920 static void export_array(mddev_t *mddev)
1921 {
1922 mdk_rdev_t *rdev, *tmp;
1923
1924 rdev_for_each(rdev, tmp, mddev) {
1925 if (!rdev->mddev) {
1926 MD_BUG();
1927 continue;
1928 }
1929 kick_rdev_from_array(rdev);
1930 }
1931 if (!list_empty(&mddev->disks))
1932 MD_BUG();
1933 mddev->raid_disks = 0;
1934 mddev->major_version = 0;
1935 }
1936
1937 static void print_desc(mdp_disk_t *desc)
1938 {
1939 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1940 desc->major,desc->minor,desc->raid_disk,desc->state);
1941 }
1942
1943 static void print_sb_90(mdp_super_t *sb)
1944 {
1945 int i;
1946
1947 printk(KERN_INFO
1948 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1949 sb->major_version, sb->minor_version, sb->patch_version,
1950 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1951 sb->ctime);
1952 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1953 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1954 sb->md_minor, sb->layout, sb->chunk_size);
1955 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1956 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1957 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1958 sb->failed_disks, sb->spare_disks,
1959 sb->sb_csum, (unsigned long)sb->events_lo);
1960
1961 printk(KERN_INFO);
1962 for (i = 0; i < MD_SB_DISKS; i++) {
1963 mdp_disk_t *desc;
1964
1965 desc = sb->disks + i;
1966 if (desc->number || desc->major || desc->minor ||
1967 desc->raid_disk || (desc->state && (desc->state != 4))) {
1968 printk(" D %2d: ", i);
1969 print_desc(desc);
1970 }
1971 }
1972 printk(KERN_INFO "md: THIS: ");
1973 print_desc(&sb->this_disk);
1974 }
1975
1976 static void print_sb_1(struct mdp_superblock_1 *sb)
1977 {
1978 __u8 *uuid;
1979
1980 uuid = sb->set_uuid;
1981 printk(KERN_INFO
1982 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
1983 "md: Name: \"%s\" CT:%llu\n",
1984 le32_to_cpu(sb->major_version),
1985 le32_to_cpu(sb->feature_map),
1986 uuid,
1987 sb->set_name,
1988 (unsigned long long)le64_to_cpu(sb->ctime)
1989 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
1990
1991 uuid = sb->device_uuid;
1992 printk(KERN_INFO
1993 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1994 " RO:%llu\n"
1995 "md: Dev:%08x UUID: %pU\n"
1996 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1997 "md: (MaxDev:%u) \n",
1998 le32_to_cpu(sb->level),
1999 (unsigned long long)le64_to_cpu(sb->size),
2000 le32_to_cpu(sb->raid_disks),
2001 le32_to_cpu(sb->layout),
2002 le32_to_cpu(sb->chunksize),
2003 (unsigned long long)le64_to_cpu(sb->data_offset),
2004 (unsigned long long)le64_to_cpu(sb->data_size),
2005 (unsigned long long)le64_to_cpu(sb->super_offset),
2006 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2007 le32_to_cpu(sb->dev_number),
2008 uuid,
2009 sb->devflags,
2010 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2011 (unsigned long long)le64_to_cpu(sb->events),
2012 (unsigned long long)le64_to_cpu(sb->resync_offset),
2013 le32_to_cpu(sb->sb_csum),
2014 le32_to_cpu(sb->max_dev)
2015 );
2016 }
2017
2018 static void print_rdev(mdk_rdev_t *rdev, int major_version)
2019 {
2020 char b[BDEVNAME_SIZE];
2021 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2022 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
2023 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2024 rdev->desc_nr);
2025 if (rdev->sb_loaded) {
2026 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2027 switch (major_version) {
2028 case 0:
2029 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
2030 break;
2031 case 1:
2032 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
2033 break;
2034 }
2035 } else
2036 printk(KERN_INFO "md: no rdev superblock!\n");
2037 }
2038
2039 static void md_print_devices(void)
2040 {
2041 struct list_head *tmp;
2042 mdk_rdev_t *rdev;
2043 mddev_t *mddev;
2044 char b[BDEVNAME_SIZE];
2045
2046 printk("\n");
2047 printk("md: **********************************\n");
2048 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2049 printk("md: **********************************\n");
2050 for_each_mddev(mddev, tmp) {
2051
2052 if (mddev->bitmap)
2053 bitmap_print_sb(mddev->bitmap);
2054 else
2055 printk("%s: ", mdname(mddev));
2056 list_for_each_entry(rdev, &mddev->disks, same_set)
2057 printk("<%s>", bdevname(rdev->bdev,b));
2058 printk("\n");
2059
2060 list_for_each_entry(rdev, &mddev->disks, same_set)
2061 print_rdev(rdev, mddev->major_version);
2062 }
2063 printk("md: **********************************\n");
2064 printk("\n");
2065 }
2066
2067
2068 static void sync_sbs(mddev_t * mddev, int nospares)
2069 {
2070 /* Update each superblock (in-memory image), but
2071 * if we are allowed to, skip spares which already
2072 * have the right event counter, or have one earlier
2073 * (which would mean they aren't being marked as dirty
2074 * with the rest of the array)
2075 */
2076 mdk_rdev_t *rdev;
2077 list_for_each_entry(rdev, &mddev->disks, same_set) {
2078 if (rdev->sb_events == mddev->events ||
2079 (nospares &&
2080 rdev->raid_disk < 0 &&
2081 rdev->sb_events+1 == mddev->events)) {
2082 /* Don't update this superblock */
2083 rdev->sb_loaded = 2;
2084 } else {
2085 super_types[mddev->major_version].
2086 sync_super(mddev, rdev);
2087 rdev->sb_loaded = 1;
2088 }
2089 }
2090 }
2091
2092 static void md_update_sb(mddev_t * mddev, int force_change)
2093 {
2094 mdk_rdev_t *rdev;
2095 int sync_req;
2096 int nospares = 0;
2097
2098 repeat:
2099 /* First make sure individual recovery_offsets are correct */
2100 list_for_each_entry(rdev, &mddev->disks, same_set) {
2101 if (rdev->raid_disk >= 0 &&
2102 mddev->delta_disks >= 0 &&
2103 !test_bit(In_sync, &rdev->flags) &&
2104 mddev->curr_resync_completed > rdev->recovery_offset)
2105 rdev->recovery_offset = mddev->curr_resync_completed;
2106
2107 }
2108 if (!mddev->persistent) {
2109 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2110 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2111 wake_up(&mddev->sb_wait);
2112 return;
2113 }
2114
2115 spin_lock_irq(&mddev->write_lock);
2116
2117 mddev->utime = get_seconds();
2118
2119 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2120 force_change = 1;
2121 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2122 /* just a clean<-> dirty transition, possibly leave spares alone,
2123 * though if events isn't the right even/odd, we will have to do
2124 * spares after all
2125 */
2126 nospares = 1;
2127 if (force_change)
2128 nospares = 0;
2129 if (mddev->degraded)
2130 /* If the array is degraded, then skipping spares is both
2131 * dangerous and fairly pointless.
2132 * Dangerous because a device that was removed from the array
2133 * might have a event_count that still looks up-to-date,
2134 * so it can be re-added without a resync.
2135 * Pointless because if there are any spares to skip,
2136 * then a recovery will happen and soon that array won't
2137 * be degraded any more and the spare can go back to sleep then.
2138 */
2139 nospares = 0;
2140
2141 sync_req = mddev->in_sync;
2142
2143 /* If this is just a dirty<->clean transition, and the array is clean
2144 * and 'events' is odd, we can roll back to the previous clean state */
2145 if (nospares
2146 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2147 && mddev->can_decrease_events
2148 && mddev->events != 1) {
2149 mddev->events--;
2150 mddev->can_decrease_events = 0;
2151 } else {
2152 /* otherwise we have to go forward and ... */
2153 mddev->events ++;
2154 mddev->can_decrease_events = nospares;
2155 }
2156
2157 if (!mddev->events) {
2158 /*
2159 * oops, this 64-bit counter should never wrap.
2160 * Either we are in around ~1 trillion A.C., assuming
2161 * 1 reboot per second, or we have a bug:
2162 */
2163 MD_BUG();
2164 mddev->events --;
2165 }
2166 sync_sbs(mddev, nospares);
2167 spin_unlock_irq(&mddev->write_lock);
2168
2169 dprintk(KERN_INFO
2170 "md: updating %s RAID superblock on device (in sync %d)\n",
2171 mdname(mddev),mddev->in_sync);
2172
2173 bitmap_update_sb(mddev->bitmap);
2174 list_for_each_entry(rdev, &mddev->disks, same_set) {
2175 char b[BDEVNAME_SIZE];
2176 dprintk(KERN_INFO "md: ");
2177 if (rdev->sb_loaded != 1)
2178 continue; /* no noise on spare devices */
2179 if (test_bit(Faulty, &rdev->flags))
2180 dprintk("(skipping faulty ");
2181
2182 dprintk("%s ", bdevname(rdev->bdev,b));
2183 if (!test_bit(Faulty, &rdev->flags)) {
2184 md_super_write(mddev,rdev,
2185 rdev->sb_start, rdev->sb_size,
2186 rdev->sb_page);
2187 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2188 bdevname(rdev->bdev,b),
2189 (unsigned long long)rdev->sb_start);
2190 rdev->sb_events = mddev->events;
2191
2192 } else
2193 dprintk(")\n");
2194 if (mddev->level == LEVEL_MULTIPATH)
2195 /* only need to write one superblock... */
2196 break;
2197 }
2198 md_super_wait(mddev);
2199 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2200
2201 spin_lock_irq(&mddev->write_lock);
2202 if (mddev->in_sync != sync_req ||
2203 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2204 /* have to write it out again */
2205 spin_unlock_irq(&mddev->write_lock);
2206 goto repeat;
2207 }
2208 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2209 spin_unlock_irq(&mddev->write_lock);
2210 wake_up(&mddev->sb_wait);
2211 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2212 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2213
2214 }
2215
2216 /* words written to sysfs files may, or may not, be \n terminated.
2217 * We want to accept with case. For this we use cmd_match.
2218 */
2219 static int cmd_match(const char *cmd, const char *str)
2220 {
2221 /* See if cmd, written into a sysfs file, matches
2222 * str. They must either be the same, or cmd can
2223 * have a trailing newline
2224 */
2225 while (*cmd && *str && *cmd == *str) {
2226 cmd++;
2227 str++;
2228 }
2229 if (*cmd == '\n')
2230 cmd++;
2231 if (*str || *cmd)
2232 return 0;
2233 return 1;
2234 }
2235
2236 struct rdev_sysfs_entry {
2237 struct attribute attr;
2238 ssize_t (*show)(mdk_rdev_t *, char *);
2239 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2240 };
2241
2242 static ssize_t
2243 state_show(mdk_rdev_t *rdev, char *page)
2244 {
2245 char *sep = "";
2246 size_t len = 0;
2247
2248 if (test_bit(Faulty, &rdev->flags)) {
2249 len+= sprintf(page+len, "%sfaulty",sep);
2250 sep = ",";
2251 }
2252 if (test_bit(In_sync, &rdev->flags)) {
2253 len += sprintf(page+len, "%sin_sync",sep);
2254 sep = ",";
2255 }
2256 if (test_bit(WriteMostly, &rdev->flags)) {
2257 len += sprintf(page+len, "%swrite_mostly",sep);
2258 sep = ",";
2259 }
2260 if (test_bit(Blocked, &rdev->flags)) {
2261 len += sprintf(page+len, "%sblocked", sep);
2262 sep = ",";
2263 }
2264 if (!test_bit(Faulty, &rdev->flags) &&
2265 !test_bit(In_sync, &rdev->flags)) {
2266 len += sprintf(page+len, "%sspare", sep);
2267 sep = ",";
2268 }
2269 return len+sprintf(page+len, "\n");
2270 }
2271
2272 static ssize_t
2273 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2274 {
2275 /* can write
2276 * faulty - simulates and error
2277 * remove - disconnects the device
2278 * writemostly - sets write_mostly
2279 * -writemostly - clears write_mostly
2280 * blocked - sets the Blocked flag
2281 * -blocked - clears the Blocked flag
2282 * insync - sets Insync providing device isn't active
2283 */
2284 int err = -EINVAL;
2285 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2286 md_error(rdev->mddev, rdev);
2287 err = 0;
2288 } else if (cmd_match(buf, "remove")) {
2289 if (rdev->raid_disk >= 0)
2290 err = -EBUSY;
2291 else {
2292 mddev_t *mddev = rdev->mddev;
2293 kick_rdev_from_array(rdev);
2294 if (mddev->pers)
2295 md_update_sb(mddev, 1);
2296 md_new_event(mddev);
2297 err = 0;
2298 }
2299 } else if (cmd_match(buf, "writemostly")) {
2300 set_bit(WriteMostly, &rdev->flags);
2301 err = 0;
2302 } else if (cmd_match(buf, "-writemostly")) {
2303 clear_bit(WriteMostly, &rdev->flags);
2304 err = 0;
2305 } else if (cmd_match(buf, "blocked")) {
2306 set_bit(Blocked, &rdev->flags);
2307 err = 0;
2308 } else if (cmd_match(buf, "-blocked")) {
2309 clear_bit(Blocked, &rdev->flags);
2310 wake_up(&rdev->blocked_wait);
2311 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2312 md_wakeup_thread(rdev->mddev->thread);
2313
2314 err = 0;
2315 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2316 set_bit(In_sync, &rdev->flags);
2317 err = 0;
2318 }
2319 if (!err)
2320 sysfs_notify_dirent_safe(rdev->sysfs_state);
2321 return err ? err : len;
2322 }
2323 static struct rdev_sysfs_entry rdev_state =
2324 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2325
2326 static ssize_t
2327 errors_show(mdk_rdev_t *rdev, char *page)
2328 {
2329 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2330 }
2331
2332 static ssize_t
2333 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2334 {
2335 char *e;
2336 unsigned long n = simple_strtoul(buf, &e, 10);
2337 if (*buf && (*e == 0 || *e == '\n')) {
2338 atomic_set(&rdev->corrected_errors, n);
2339 return len;
2340 }
2341 return -EINVAL;
2342 }
2343 static struct rdev_sysfs_entry rdev_errors =
2344 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2345
2346 static ssize_t
2347 slot_show(mdk_rdev_t *rdev, char *page)
2348 {
2349 if (rdev->raid_disk < 0)
2350 return sprintf(page, "none\n");
2351 else
2352 return sprintf(page, "%d\n", rdev->raid_disk);
2353 }
2354
2355 static ssize_t
2356 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2357 {
2358 char *e;
2359 int err;
2360 char nm[20];
2361 int slot = simple_strtoul(buf, &e, 10);
2362 if (strncmp(buf, "none", 4)==0)
2363 slot = -1;
2364 else if (e==buf || (*e && *e!= '\n'))
2365 return -EINVAL;
2366 if (rdev->mddev->pers && slot == -1) {
2367 /* Setting 'slot' on an active array requires also
2368 * updating the 'rd%d' link, and communicating
2369 * with the personality with ->hot_*_disk.
2370 * For now we only support removing
2371 * failed/spare devices. This normally happens automatically,
2372 * but not when the metadata is externally managed.
2373 */
2374 if (rdev->raid_disk == -1)
2375 return -EEXIST;
2376 /* personality does all needed checks */
2377 if (rdev->mddev->pers->hot_add_disk == NULL)
2378 return -EINVAL;
2379 err = rdev->mddev->pers->
2380 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2381 if (err)
2382 return err;
2383 sprintf(nm, "rd%d", rdev->raid_disk);
2384 sysfs_remove_link(&rdev->mddev->kobj, nm);
2385 rdev->raid_disk = -1;
2386 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2387 md_wakeup_thread(rdev->mddev->thread);
2388 } else if (rdev->mddev->pers) {
2389 mdk_rdev_t *rdev2;
2390 /* Activating a spare .. or possibly reactivating
2391 * if we ever get bitmaps working here.
2392 */
2393
2394 if (rdev->raid_disk != -1)
2395 return -EBUSY;
2396
2397 if (rdev->mddev->pers->hot_add_disk == NULL)
2398 return -EINVAL;
2399
2400 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2401 if (rdev2->raid_disk == slot)
2402 return -EEXIST;
2403
2404 rdev->raid_disk = slot;
2405 if (test_bit(In_sync, &rdev->flags))
2406 rdev->saved_raid_disk = slot;
2407 else
2408 rdev->saved_raid_disk = -1;
2409 err = rdev->mddev->pers->
2410 hot_add_disk(rdev->mddev, rdev);
2411 if (err) {
2412 rdev->raid_disk = -1;
2413 return err;
2414 } else
2415 sysfs_notify_dirent_safe(rdev->sysfs_state);
2416 sprintf(nm, "rd%d", rdev->raid_disk);
2417 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2418 /* failure here is OK */;
2419 /* don't wakeup anyone, leave that to userspace. */
2420 } else {
2421 if (slot >= rdev->mddev->raid_disks)
2422 return -ENOSPC;
2423 rdev->raid_disk = slot;
2424 /* assume it is working */
2425 clear_bit(Faulty, &rdev->flags);
2426 clear_bit(WriteMostly, &rdev->flags);
2427 set_bit(In_sync, &rdev->flags);
2428 sysfs_notify_dirent_safe(rdev->sysfs_state);
2429 }
2430 return len;
2431 }
2432
2433
2434 static struct rdev_sysfs_entry rdev_slot =
2435 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2436
2437 static ssize_t
2438 offset_show(mdk_rdev_t *rdev, char *page)
2439 {
2440 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2441 }
2442
2443 static ssize_t
2444 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2445 {
2446 char *e;
2447 unsigned long long offset = simple_strtoull(buf, &e, 10);
2448 if (e==buf || (*e && *e != '\n'))
2449 return -EINVAL;
2450 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2451 return -EBUSY;
2452 if (rdev->sectors && rdev->mddev->external)
2453 /* Must set offset before size, so overlap checks
2454 * can be sane */
2455 return -EBUSY;
2456 rdev->data_offset = offset;
2457 return len;
2458 }
2459
2460 static struct rdev_sysfs_entry rdev_offset =
2461 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2462
2463 static ssize_t
2464 rdev_size_show(mdk_rdev_t *rdev, char *page)
2465 {
2466 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2467 }
2468
2469 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2470 {
2471 /* check if two start/length pairs overlap */
2472 if (s1+l1 <= s2)
2473 return 0;
2474 if (s2+l2 <= s1)
2475 return 0;
2476 return 1;
2477 }
2478
2479 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2480 {
2481 unsigned long long blocks;
2482 sector_t new;
2483
2484 if (strict_strtoull(buf, 10, &blocks) < 0)
2485 return -EINVAL;
2486
2487 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2488 return -EINVAL; /* sector conversion overflow */
2489
2490 new = blocks * 2;
2491 if (new != blocks * 2)
2492 return -EINVAL; /* unsigned long long to sector_t overflow */
2493
2494 *sectors = new;
2495 return 0;
2496 }
2497
2498 static ssize_t
2499 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2500 {
2501 mddev_t *my_mddev = rdev->mddev;
2502 sector_t oldsectors = rdev->sectors;
2503 sector_t sectors;
2504
2505 if (strict_blocks_to_sectors(buf, &sectors) < 0)
2506 return -EINVAL;
2507 if (my_mddev->pers && rdev->raid_disk >= 0) {
2508 if (my_mddev->persistent) {
2509 sectors = super_types[my_mddev->major_version].
2510 rdev_size_change(rdev, sectors);
2511 if (!sectors)
2512 return -EBUSY;
2513 } else if (!sectors)
2514 sectors = (rdev->bdev->bd_inode->i_size >> 9) -
2515 rdev->data_offset;
2516 }
2517 if (sectors < my_mddev->dev_sectors)
2518 return -EINVAL; /* component must fit device */
2519
2520 rdev->sectors = sectors;
2521 if (sectors > oldsectors && my_mddev->external) {
2522 /* need to check that all other rdevs with the same ->bdev
2523 * do not overlap. We need to unlock the mddev to avoid
2524 * a deadlock. We have already changed rdev->sectors, and if
2525 * we have to change it back, we will have the lock again.
2526 */
2527 mddev_t *mddev;
2528 int overlap = 0;
2529 struct list_head *tmp;
2530
2531 mddev_unlock(my_mddev);
2532 for_each_mddev(mddev, tmp) {
2533 mdk_rdev_t *rdev2;
2534
2535 mddev_lock(mddev);
2536 list_for_each_entry(rdev2, &mddev->disks, same_set)
2537 if (test_bit(AllReserved, &rdev2->flags) ||
2538 (rdev->bdev == rdev2->bdev &&
2539 rdev != rdev2 &&
2540 overlaps(rdev->data_offset, rdev->sectors,
2541 rdev2->data_offset,
2542 rdev2->sectors))) {
2543 overlap = 1;
2544 break;
2545 }
2546 mddev_unlock(mddev);
2547 if (overlap) {
2548 mddev_put(mddev);
2549 break;
2550 }
2551 }
2552 mddev_lock(my_mddev);
2553 if (overlap) {
2554 /* Someone else could have slipped in a size
2555 * change here, but doing so is just silly.
2556 * We put oldsectors back because we *know* it is
2557 * safe, and trust userspace not to race with
2558 * itself
2559 */
2560 rdev->sectors = oldsectors;
2561 return -EBUSY;
2562 }
2563 }
2564 return len;
2565 }
2566
2567 static struct rdev_sysfs_entry rdev_size =
2568 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2569
2570
2571 static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page)
2572 {
2573 unsigned long long recovery_start = rdev->recovery_offset;
2574
2575 if (test_bit(In_sync, &rdev->flags) ||
2576 recovery_start == MaxSector)
2577 return sprintf(page, "none\n");
2578
2579 return sprintf(page, "%llu\n", recovery_start);
2580 }
2581
2582 static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2583 {
2584 unsigned long long recovery_start;
2585
2586 if (cmd_match(buf, "none"))
2587 recovery_start = MaxSector;
2588 else if (strict_strtoull(buf, 10, &recovery_start))
2589 return -EINVAL;
2590
2591 if (rdev->mddev->pers &&
2592 rdev->raid_disk >= 0)
2593 return -EBUSY;
2594
2595 rdev->recovery_offset = recovery_start;
2596 if (recovery_start == MaxSector)
2597 set_bit(In_sync, &rdev->flags);
2598 else
2599 clear_bit(In_sync, &rdev->flags);
2600 return len;
2601 }
2602
2603 static struct rdev_sysfs_entry rdev_recovery_start =
2604 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
2605
2606 static struct attribute *rdev_default_attrs[] = {
2607 &rdev_state.attr,
2608 &rdev_errors.attr,
2609 &rdev_slot.attr,
2610 &rdev_offset.attr,
2611 &rdev_size.attr,
2612 &rdev_recovery_start.attr,
2613 NULL,
2614 };
2615 static ssize_t
2616 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2617 {
2618 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2619 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2620 mddev_t *mddev = rdev->mddev;
2621 ssize_t rv;
2622
2623 if (!entry->show)
2624 return -EIO;
2625
2626 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2627 if (!rv) {
2628 if (rdev->mddev == NULL)
2629 rv = -EBUSY;
2630 else
2631 rv = entry->show(rdev, page);
2632 mddev_unlock(mddev);
2633 }
2634 return rv;
2635 }
2636
2637 static ssize_t
2638 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2639 const char *page, size_t length)
2640 {
2641 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2642 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2643 ssize_t rv;
2644 mddev_t *mddev = rdev->mddev;
2645
2646 if (!entry->store)
2647 return -EIO;
2648 if (!capable(CAP_SYS_ADMIN))
2649 return -EACCES;
2650 rv = mddev ? mddev_lock(mddev): -EBUSY;
2651 if (!rv) {
2652 if (rdev->mddev == NULL)
2653 rv = -EBUSY;
2654 else
2655 rv = entry->store(rdev, page, length);
2656 mddev_unlock(mddev);
2657 }
2658 return rv;
2659 }
2660
2661 static void rdev_free(struct kobject *ko)
2662 {
2663 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2664 kfree(rdev);
2665 }
2666 static const struct sysfs_ops rdev_sysfs_ops = {
2667 .show = rdev_attr_show,
2668 .store = rdev_attr_store,
2669 };
2670 static struct kobj_type rdev_ktype = {
2671 .release = rdev_free,
2672 .sysfs_ops = &rdev_sysfs_ops,
2673 .default_attrs = rdev_default_attrs,
2674 };
2675
2676 void md_rdev_init(mdk_rdev_t *rdev)
2677 {
2678 rdev->desc_nr = -1;
2679 rdev->saved_raid_disk = -1;
2680 rdev->raid_disk = -1;
2681 rdev->flags = 0;
2682 rdev->data_offset = 0;
2683 rdev->sb_events = 0;
2684 rdev->last_read_error.tv_sec = 0;
2685 rdev->last_read_error.tv_nsec = 0;
2686 atomic_set(&rdev->nr_pending, 0);
2687 atomic_set(&rdev->read_errors, 0);
2688 atomic_set(&rdev->corrected_errors, 0);
2689
2690 INIT_LIST_HEAD(&rdev->same_set);
2691 init_waitqueue_head(&rdev->blocked_wait);
2692 }
2693 EXPORT_SYMBOL_GPL(md_rdev_init);
2694 /*
2695 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2696 *
2697 * mark the device faulty if:
2698 *
2699 * - the device is nonexistent (zero size)
2700 * - the device has no valid superblock
2701 *
2702 * a faulty rdev _never_ has rdev->sb set.
2703 */
2704 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2705 {
2706 char b[BDEVNAME_SIZE];
2707 int err;
2708 mdk_rdev_t *rdev;
2709 sector_t size;
2710
2711 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2712 if (!rdev) {
2713 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2714 return ERR_PTR(-ENOMEM);
2715 }
2716
2717 md_rdev_init(rdev);
2718 if ((err = alloc_disk_sb(rdev)))
2719 goto abort_free;
2720
2721 err = lock_rdev(rdev, newdev, super_format == -2);
2722 if (err)
2723 goto abort_free;
2724
2725 kobject_init(&rdev->kobj, &rdev_ktype);
2726
2727 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2728 if (!size) {
2729 printk(KERN_WARNING
2730 "md: %s has zero or unknown size, marking faulty!\n",
2731 bdevname(rdev->bdev,b));
2732 err = -EINVAL;
2733 goto abort_free;
2734 }
2735
2736 if (super_format >= 0) {
2737 err = super_types[super_format].
2738 load_super(rdev, NULL, super_minor);
2739 if (err == -EINVAL) {
2740 printk(KERN_WARNING
2741 "md: %s does not have a valid v%d.%d "
2742 "superblock, not importing!\n",
2743 bdevname(rdev->bdev,b),
2744 super_format, super_minor);
2745 goto abort_free;
2746 }
2747 if (err < 0) {
2748 printk(KERN_WARNING
2749 "md: could not read %s's sb, not importing!\n",
2750 bdevname(rdev->bdev,b));
2751 goto abort_free;
2752 }
2753 }
2754
2755 return rdev;
2756
2757 abort_free:
2758 if (rdev->sb_page) {
2759 if (rdev->bdev)
2760 unlock_rdev(rdev);
2761 free_disk_sb(rdev);
2762 }
2763 kfree(rdev);
2764 return ERR_PTR(err);
2765 }
2766
2767 /*
2768 * Check a full RAID array for plausibility
2769 */
2770
2771
2772 static void analyze_sbs(mddev_t * mddev)
2773 {
2774 int i;
2775 mdk_rdev_t *rdev, *freshest, *tmp;
2776 char b[BDEVNAME_SIZE];
2777
2778 freshest = NULL;
2779 rdev_for_each(rdev, tmp, mddev)
2780 switch (super_types[mddev->major_version].
2781 load_super(rdev, freshest, mddev->minor_version)) {
2782 case 1:
2783 freshest = rdev;
2784 break;
2785 case 0:
2786 break;
2787 default:
2788 printk( KERN_ERR \
2789 "md: fatal superblock inconsistency in %s"
2790 " -- removing from array\n",
2791 bdevname(rdev->bdev,b));
2792 kick_rdev_from_array(rdev);
2793 }
2794
2795
2796 super_types[mddev->major_version].
2797 validate_super(mddev, freshest);
2798
2799 i = 0;
2800 rdev_for_each(rdev, tmp, mddev) {
2801 if (mddev->max_disks &&
2802 (rdev->desc_nr >= mddev->max_disks ||
2803 i > mddev->max_disks)) {
2804 printk(KERN_WARNING
2805 "md: %s: %s: only %d devices permitted\n",
2806 mdname(mddev), bdevname(rdev->bdev, b),
2807 mddev->max_disks);
2808 kick_rdev_from_array(rdev);
2809 continue;
2810 }
2811 if (rdev != freshest)
2812 if (super_types[mddev->major_version].
2813 validate_super(mddev, rdev)) {
2814 printk(KERN_WARNING "md: kicking non-fresh %s"
2815 " from array!\n",
2816 bdevname(rdev->bdev,b));
2817 kick_rdev_from_array(rdev);
2818 continue;
2819 }
2820 if (mddev->level == LEVEL_MULTIPATH) {
2821 rdev->desc_nr = i++;
2822 rdev->raid_disk = rdev->desc_nr;
2823 set_bit(In_sync, &rdev->flags);
2824 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
2825 rdev->raid_disk = -1;
2826 clear_bit(In_sync, &rdev->flags);
2827 }
2828 }
2829 }
2830
2831 /* Read a fixed-point number.
2832 * Numbers in sysfs attributes should be in "standard" units where
2833 * possible, so time should be in seconds.
2834 * However we internally use a a much smaller unit such as
2835 * milliseconds or jiffies.
2836 * This function takes a decimal number with a possible fractional
2837 * component, and produces an integer which is the result of
2838 * multiplying that number by 10^'scale'.
2839 * all without any floating-point arithmetic.
2840 */
2841 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
2842 {
2843 unsigned long result = 0;
2844 long decimals = -1;
2845 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
2846 if (*cp == '.')
2847 decimals = 0;
2848 else if (decimals < scale) {
2849 unsigned int value;
2850 value = *cp - '0';
2851 result = result * 10 + value;
2852 if (decimals >= 0)
2853 decimals++;
2854 }
2855 cp++;
2856 }
2857 if (*cp == '\n')
2858 cp++;
2859 if (*cp)
2860 return -EINVAL;
2861 if (decimals < 0)
2862 decimals = 0;
2863 while (decimals < scale) {
2864 result *= 10;
2865 decimals ++;
2866 }
2867 *res = result;
2868 return 0;
2869 }
2870
2871
2872 static void md_safemode_timeout(unsigned long data);
2873
2874 static ssize_t
2875 safe_delay_show(mddev_t *mddev, char *page)
2876 {
2877 int msec = (mddev->safemode_delay*1000)/HZ;
2878 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2879 }
2880 static ssize_t
2881 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2882 {
2883 unsigned long msec;
2884
2885 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
2886 return -EINVAL;
2887 if (msec == 0)
2888 mddev->safemode_delay = 0;
2889 else {
2890 unsigned long old_delay = mddev->safemode_delay;
2891 mddev->safemode_delay = (msec*HZ)/1000;
2892 if (mddev->safemode_delay == 0)
2893 mddev->safemode_delay = 1;
2894 if (mddev->safemode_delay < old_delay)
2895 md_safemode_timeout((unsigned long)mddev);
2896 }
2897 return len;
2898 }
2899 static struct md_sysfs_entry md_safe_delay =
2900 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2901
2902 static ssize_t
2903 level_show(mddev_t *mddev, char *page)
2904 {
2905 struct mdk_personality *p = mddev->pers;
2906 if (p)
2907 return sprintf(page, "%s\n", p->name);
2908 else if (mddev->clevel[0])
2909 return sprintf(page, "%s\n", mddev->clevel);
2910 else if (mddev->level != LEVEL_NONE)
2911 return sprintf(page, "%d\n", mddev->level);
2912 else
2913 return 0;
2914 }
2915
2916 static ssize_t
2917 level_store(mddev_t *mddev, const char *buf, size_t len)
2918 {
2919 char clevel[16];
2920 ssize_t rv = len;
2921 struct mdk_personality *pers;
2922 long level;
2923 void *priv;
2924 mdk_rdev_t *rdev;
2925
2926 if (mddev->pers == NULL) {
2927 if (len == 0)
2928 return 0;
2929 if (len >= sizeof(mddev->clevel))
2930 return -ENOSPC;
2931 strncpy(mddev->clevel, buf, len);
2932 if (mddev->clevel[len-1] == '\n')
2933 len--;
2934 mddev->clevel[len] = 0;
2935 mddev->level = LEVEL_NONE;
2936 return rv;
2937 }
2938
2939 /* request to change the personality. Need to ensure:
2940 * - array is not engaged in resync/recovery/reshape
2941 * - old personality can be suspended
2942 * - new personality will access other array.
2943 */
2944
2945 if (mddev->sync_thread ||
2946 mddev->reshape_position != MaxSector ||
2947 mddev->sysfs_active)
2948 return -EBUSY;
2949
2950 if (!mddev->pers->quiesce) {
2951 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
2952 mdname(mddev), mddev->pers->name);
2953 return -EINVAL;
2954 }
2955
2956 /* Now find the new personality */
2957 if (len == 0 || len >= sizeof(clevel))
2958 return -EINVAL;
2959 strncpy(clevel, buf, len);
2960 if (clevel[len-1] == '\n')
2961 len--;
2962 clevel[len] = 0;
2963 if (strict_strtol(clevel, 10, &level))
2964 level = LEVEL_NONE;
2965
2966 if (request_module("md-%s", clevel) != 0)
2967 request_module("md-level-%s", clevel);
2968 spin_lock(&pers_lock);
2969 pers = find_pers(level, clevel);
2970 if (!pers || !try_module_get(pers->owner)) {
2971 spin_unlock(&pers_lock);
2972 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
2973 return -EINVAL;
2974 }
2975 spin_unlock(&pers_lock);
2976
2977 if (pers == mddev->pers) {
2978 /* Nothing to do! */
2979 module_put(pers->owner);
2980 return rv;
2981 }
2982 if (!pers->takeover) {
2983 module_put(pers->owner);
2984 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
2985 mdname(mddev), clevel);
2986 return -EINVAL;
2987 }
2988
2989 list_for_each_entry(rdev, &mddev->disks, same_set)
2990 rdev->new_raid_disk = rdev->raid_disk;
2991
2992 /* ->takeover must set new_* and/or delta_disks
2993 * if it succeeds, and may set them when it fails.
2994 */
2995 priv = pers->takeover(mddev);
2996 if (IS_ERR(priv)) {
2997 mddev->new_level = mddev->level;
2998 mddev->new_layout = mddev->layout;
2999 mddev->new_chunk_sectors = mddev->chunk_sectors;
3000 mddev->raid_disks -= mddev->delta_disks;
3001 mddev->delta_disks = 0;
3002 module_put(pers->owner);
3003 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3004 mdname(mddev), clevel);
3005 return PTR_ERR(priv);
3006 }
3007
3008 /* Looks like we have a winner */
3009 mddev_suspend(mddev);
3010 mddev->pers->stop(mddev);
3011
3012 if (mddev->pers->sync_request == NULL &&
3013 pers->sync_request != NULL) {
3014 /* need to add the md_redundancy_group */
3015 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3016 printk(KERN_WARNING
3017 "md: cannot register extra attributes for %s\n",
3018 mdname(mddev));
3019 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action");
3020 }
3021 if (mddev->pers->sync_request != NULL &&
3022 pers->sync_request == NULL) {
3023 /* need to remove the md_redundancy_group */
3024 if (mddev->to_remove == NULL)
3025 mddev->to_remove = &md_redundancy_group;
3026 }
3027
3028 if (mddev->pers->sync_request == NULL &&
3029 mddev->external) {
3030 /* We are converting from a no-redundancy array
3031 * to a redundancy array and metadata is managed
3032 * externally so we need to be sure that writes
3033 * won't block due to a need to transition
3034 * clean->dirty
3035 * until external management is started.
3036 */
3037 mddev->in_sync = 0;
3038 mddev->safemode_delay = 0;
3039 mddev->safemode = 0;
3040 }
3041
3042 list_for_each_entry(rdev, &mddev->disks, same_set) {
3043 char nm[20];
3044 if (rdev->raid_disk < 0)
3045 continue;
3046 if (rdev->new_raid_disk > mddev->raid_disks)
3047 rdev->new_raid_disk = -1;
3048 if (rdev->new_raid_disk == rdev->raid_disk)
3049 continue;
3050 sprintf(nm, "rd%d", rdev->raid_disk);
3051 sysfs_remove_link(&mddev->kobj, nm);
3052 }
3053 list_for_each_entry(rdev, &mddev->disks, same_set) {
3054 if (rdev->raid_disk < 0)
3055 continue;
3056 if (rdev->new_raid_disk == rdev->raid_disk)
3057 continue;
3058 rdev->raid_disk = rdev->new_raid_disk;
3059 if (rdev->raid_disk < 0)
3060 clear_bit(In_sync, &rdev->flags);
3061 else {
3062 char nm[20];
3063 sprintf(nm, "rd%d", rdev->raid_disk);
3064 if(sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3065 printk("md: cannot register %s for %s after level change\n",
3066 nm, mdname(mddev));
3067 }
3068 }
3069
3070 module_put(mddev->pers->owner);
3071 mddev->pers = pers;
3072 mddev->private = priv;
3073 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3074 mddev->level = mddev->new_level;
3075 mddev->layout = mddev->new_layout;
3076 mddev->chunk_sectors = mddev->new_chunk_sectors;
3077 mddev->delta_disks = 0;
3078 if (mddev->pers->sync_request == NULL) {
3079 /* this is now an array without redundancy, so
3080 * it must always be in_sync
3081 */
3082 mddev->in_sync = 1;
3083 del_timer_sync(&mddev->safemode_timer);
3084 }
3085 pers->run(mddev);
3086 mddev_resume(mddev);
3087 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3088 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3089 md_wakeup_thread(mddev->thread);
3090 sysfs_notify(&mddev->kobj, NULL, "level");
3091 md_new_event(mddev);
3092 return rv;
3093 }
3094
3095 static struct md_sysfs_entry md_level =
3096 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3097
3098
3099 static ssize_t
3100 layout_show(mddev_t *mddev, char *page)
3101 {
3102 /* just a number, not meaningful for all levels */
3103 if (mddev->reshape_position != MaxSector &&
3104 mddev->layout != mddev->new_layout)
3105 return sprintf(page, "%d (%d)\n",
3106 mddev->new_layout, mddev->layout);
3107 return sprintf(page, "%d\n", mddev->layout);
3108 }
3109
3110 static ssize_t
3111 layout_store(mddev_t *mddev, const char *buf, size_t len)
3112 {
3113 char *e;
3114 unsigned long n = simple_strtoul(buf, &e, 10);
3115
3116 if (!*buf || (*e && *e != '\n'))
3117 return -EINVAL;
3118
3119 if (mddev->pers) {
3120 int err;
3121 if (mddev->pers->check_reshape == NULL)
3122 return -EBUSY;
3123 mddev->new_layout = n;
3124 err = mddev->pers->check_reshape(mddev);
3125 if (err) {
3126 mddev->new_layout = mddev->layout;
3127 return err;
3128 }
3129 } else {
3130 mddev->new_layout = n;
3131 if (mddev->reshape_position == MaxSector)
3132 mddev->layout = n;
3133 }
3134 return len;
3135 }
3136 static struct md_sysfs_entry md_layout =
3137 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3138
3139
3140 static ssize_t
3141 raid_disks_show(mddev_t *mddev, char *page)
3142 {
3143 if (mddev->raid_disks == 0)
3144 return 0;
3145 if (mddev->reshape_position != MaxSector &&
3146 mddev->delta_disks != 0)
3147 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3148 mddev->raid_disks - mddev->delta_disks);
3149 return sprintf(page, "%d\n", mddev->raid_disks);
3150 }
3151
3152 static int update_raid_disks(mddev_t *mddev, int raid_disks);
3153
3154 static ssize_t
3155 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
3156 {
3157 char *e;
3158 int rv = 0;
3159 unsigned long n = simple_strtoul(buf, &e, 10);
3160
3161 if (!*buf || (*e && *e != '\n'))
3162 return -EINVAL;
3163
3164 if (mddev->pers)
3165 rv = update_raid_disks(mddev, n);
3166 else if (mddev->reshape_position != MaxSector) {
3167 int olddisks = mddev->raid_disks - mddev->delta_disks;
3168 mddev->delta_disks = n - olddisks;
3169 mddev->raid_disks = n;
3170 } else
3171 mddev->raid_disks = n;
3172 return rv ? rv : len;
3173 }
3174 static struct md_sysfs_entry md_raid_disks =
3175 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3176
3177 static ssize_t
3178 chunk_size_show(mddev_t *mddev, char *page)
3179 {
3180 if (mddev->reshape_position != MaxSector &&
3181 mddev->chunk_sectors != mddev->new_chunk_sectors)
3182 return sprintf(page, "%d (%d)\n",
3183 mddev->new_chunk_sectors << 9,
3184 mddev->chunk_sectors << 9);
3185 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3186 }
3187
3188 static ssize_t
3189 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
3190 {
3191 char *e;
3192 unsigned long n = simple_strtoul(buf, &e, 10);
3193
3194 if (!*buf || (*e && *e != '\n'))
3195 return -EINVAL;
3196
3197 if (mddev->pers) {
3198 int err;
3199 if (mddev->pers->check_reshape == NULL)
3200 return -EBUSY;
3201 mddev->new_chunk_sectors = n >> 9;
3202 err = mddev->pers->check_reshape(mddev);
3203 if (err) {
3204 mddev->new_chunk_sectors = mddev->chunk_sectors;
3205 return err;
3206 }
3207 } else {
3208 mddev->new_chunk_sectors = n >> 9;
3209 if (mddev->reshape_position == MaxSector)
3210 mddev->chunk_sectors = n >> 9;
3211 }
3212 return len;
3213 }
3214 static struct md_sysfs_entry md_chunk_size =
3215 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3216
3217 static ssize_t
3218 resync_start_show(mddev_t *mddev, char *page)
3219 {
3220 if (mddev->recovery_cp == MaxSector)
3221 return sprintf(page, "none\n");
3222 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3223 }
3224
3225 static ssize_t
3226 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
3227 {
3228 char *e;
3229 unsigned long long n = simple_strtoull(buf, &e, 10);
3230
3231 if (mddev->pers)
3232 return -EBUSY;
3233 if (cmd_match(buf, "none"))
3234 n = MaxSector;
3235 else if (!*buf || (*e && *e != '\n'))
3236 return -EINVAL;
3237
3238 mddev->recovery_cp = n;
3239 return len;
3240 }
3241 static struct md_sysfs_entry md_resync_start =
3242 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3243
3244 /*
3245 * The array state can be:
3246 *
3247 * clear
3248 * No devices, no size, no level
3249 * Equivalent to STOP_ARRAY ioctl
3250 * inactive
3251 * May have some settings, but array is not active
3252 * all IO results in error
3253 * When written, doesn't tear down array, but just stops it
3254 * suspended (not supported yet)
3255 * All IO requests will block. The array can be reconfigured.
3256 * Writing this, if accepted, will block until array is quiescent
3257 * readonly
3258 * no resync can happen. no superblocks get written.
3259 * write requests fail
3260 * read-auto
3261 * like readonly, but behaves like 'clean' on a write request.
3262 *
3263 * clean - no pending writes, but otherwise active.
3264 * When written to inactive array, starts without resync
3265 * If a write request arrives then
3266 * if metadata is known, mark 'dirty' and switch to 'active'.
3267 * if not known, block and switch to write-pending
3268 * If written to an active array that has pending writes, then fails.
3269 * active
3270 * fully active: IO and resync can be happening.
3271 * When written to inactive array, starts with resync
3272 *
3273 * write-pending
3274 * clean, but writes are blocked waiting for 'active' to be written.
3275 *
3276 * active-idle
3277 * like active, but no writes have been seen for a while (100msec).
3278 *
3279 */
3280 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3281 write_pending, active_idle, bad_word};
3282 static char *array_states[] = {
3283 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3284 "write-pending", "active-idle", NULL };
3285
3286 static int match_word(const char *word, char **list)
3287 {
3288 int n;
3289 for (n=0; list[n]; n++)
3290 if (cmd_match(word, list[n]))
3291 break;
3292 return n;
3293 }
3294
3295 static ssize_t
3296 array_state_show(mddev_t *mddev, char *page)
3297 {
3298 enum array_state st = inactive;
3299
3300 if (mddev->pers)
3301 switch(mddev->ro) {
3302 case 1:
3303 st = readonly;
3304 break;
3305 case 2:
3306 st = read_auto;
3307 break;
3308 case 0:
3309 if (mddev->in_sync)
3310 st = clean;
3311 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3312 st = write_pending;
3313 else if (mddev->safemode)
3314 st = active_idle;
3315 else
3316 st = active;
3317 }
3318 else {
3319 if (list_empty(&mddev->disks) &&
3320 mddev->raid_disks == 0 &&
3321 mddev->dev_sectors == 0)
3322 st = clear;
3323 else
3324 st = inactive;
3325 }
3326 return sprintf(page, "%s\n", array_states[st]);
3327 }
3328
3329 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
3330 static int md_set_readonly(mddev_t * mddev, int is_open);
3331 static int do_md_run(mddev_t * mddev);
3332 static int restart_array(mddev_t *mddev);
3333
3334 static ssize_t
3335 array_state_store(mddev_t *mddev, const char *buf, size_t len)
3336 {
3337 int err = -EINVAL;
3338 enum array_state st = match_word(buf, array_states);
3339 switch(st) {
3340 case bad_word:
3341 break;
3342 case clear:
3343 /* stopping an active array */
3344 if (atomic_read(&mddev->openers) > 0)
3345 return -EBUSY;
3346 err = do_md_stop(mddev, 0, 0);
3347 break;
3348 case inactive:
3349 /* stopping an active array */
3350 if (mddev->pers) {
3351 if (atomic_read(&mddev->openers) > 0)
3352 return -EBUSY;
3353 err = do_md_stop(mddev, 2, 0);
3354 } else
3355 err = 0; /* already inactive */
3356 break;
3357 case suspended:
3358 break; /* not supported yet */
3359 case readonly:
3360 if (mddev->pers)
3361 err = md_set_readonly(mddev, 0);
3362 else {
3363 mddev->ro = 1;
3364 set_disk_ro(mddev->gendisk, 1);
3365 err = do_md_run(mddev);
3366 }
3367 break;
3368 case read_auto:
3369 if (mddev->pers) {
3370 if (mddev->ro == 0)
3371 err = md_set_readonly(mddev, 0);
3372 else if (mddev->ro == 1)
3373 err = restart_array(mddev);
3374 if (err == 0) {
3375 mddev->ro = 2;
3376 set_disk_ro(mddev->gendisk, 0);
3377 }
3378 } else {
3379 mddev->ro = 2;
3380 err = do_md_run(mddev);
3381 }
3382 break;
3383 case clean:
3384 if (mddev->pers) {
3385 restart_array(mddev);
3386 spin_lock_irq(&mddev->write_lock);
3387 if (atomic_read(&mddev->writes_pending) == 0) {
3388 if (mddev->in_sync == 0) {
3389 mddev->in_sync = 1;
3390 if (mddev->safemode == 1)
3391 mddev->safemode = 0;
3392 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3393 }
3394 err = 0;
3395 } else
3396 err = -EBUSY;
3397 spin_unlock_irq(&mddev->write_lock);
3398 } else
3399 err = -EINVAL;
3400 break;
3401 case active:
3402 if (mddev->pers) {
3403 restart_array(mddev);
3404 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3405 wake_up(&mddev->sb_wait);
3406 err = 0;
3407 } else {
3408 mddev->ro = 0;
3409 set_disk_ro(mddev->gendisk, 0);
3410 err = do_md_run(mddev);
3411 }
3412 break;
3413 case write_pending:
3414 case active_idle:
3415 /* these cannot be set */
3416 break;
3417 }
3418 if (err)
3419 return err;
3420 else {
3421 sysfs_notify_dirent_safe(mddev->sysfs_state);
3422 return len;
3423 }
3424 }
3425 static struct md_sysfs_entry md_array_state =
3426 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3427
3428 static ssize_t
3429 max_corrected_read_errors_show(mddev_t *mddev, char *page) {
3430 return sprintf(page, "%d\n",
3431 atomic_read(&mddev->max_corr_read_errors));
3432 }
3433
3434 static ssize_t
3435 max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len)
3436 {
3437 char *e;
3438 unsigned long n = simple_strtoul(buf, &e, 10);
3439
3440 if (*buf && (*e == 0 || *e == '\n')) {
3441 atomic_set(&mddev->max_corr_read_errors, n);
3442 return len;
3443 }
3444 return -EINVAL;
3445 }
3446
3447 static struct md_sysfs_entry max_corr_read_errors =
3448 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3449 max_corrected_read_errors_store);
3450
3451 static ssize_t
3452 null_show(mddev_t *mddev, char *page)
3453 {
3454 return -EINVAL;
3455 }
3456
3457 static ssize_t
3458 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3459 {
3460 /* buf must be %d:%d\n? giving major and minor numbers */
3461 /* The new device is added to the array.
3462 * If the array has a persistent superblock, we read the
3463 * superblock to initialise info and check validity.
3464 * Otherwise, only checking done is that in bind_rdev_to_array,
3465 * which mainly checks size.
3466 */
3467 char *e;
3468 int major = simple_strtoul(buf, &e, 10);
3469 int minor;
3470 dev_t dev;
3471 mdk_rdev_t *rdev;
3472 int err;
3473
3474 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3475 return -EINVAL;
3476 minor = simple_strtoul(e+1, &e, 10);
3477 if (*e && *e != '\n')
3478 return -EINVAL;
3479 dev = MKDEV(major, minor);
3480 if (major != MAJOR(dev) ||
3481 minor != MINOR(dev))
3482 return -EOVERFLOW;
3483
3484
3485 if (mddev->persistent) {
3486 rdev = md_import_device(dev, mddev->major_version,
3487 mddev->minor_version);
3488 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3489 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3490 mdk_rdev_t, same_set);
3491 err = super_types[mddev->major_version]
3492 .load_super(rdev, rdev0, mddev->minor_version);
3493 if (err < 0)
3494 goto out;
3495 }
3496 } else if (mddev->external)
3497 rdev = md_import_device(dev, -2, -1);
3498 else
3499 rdev = md_import_device(dev, -1, -1);
3500
3501 if (IS_ERR(rdev))
3502 return PTR_ERR(rdev);
3503 err = bind_rdev_to_array(rdev, mddev);
3504 out:
3505 if (err)
3506 export_rdev(rdev);
3507 return err ? err : len;
3508 }
3509
3510 static struct md_sysfs_entry md_new_device =
3511 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3512
3513 static ssize_t
3514 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3515 {
3516 char *end;
3517 unsigned long chunk, end_chunk;
3518
3519 if (!mddev->bitmap)
3520 goto out;
3521 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3522 while (*buf) {
3523 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3524 if (buf == end) break;
3525 if (*end == '-') { /* range */
3526 buf = end + 1;
3527 end_chunk = simple_strtoul(buf, &end, 0);
3528 if (buf == end) break;
3529 }
3530 if (*end && !isspace(*end)) break;
3531 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3532 buf = skip_spaces(end);
3533 }
3534 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3535 out:
3536 return len;
3537 }
3538
3539 static struct md_sysfs_entry md_bitmap =
3540 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3541
3542 static ssize_t
3543 size_show(mddev_t *mddev, char *page)
3544 {
3545 return sprintf(page, "%llu\n",
3546 (unsigned long long)mddev->dev_sectors / 2);
3547 }
3548
3549 static int update_size(mddev_t *mddev, sector_t num_sectors);
3550
3551 static ssize_t
3552 size_store(mddev_t *mddev, const char *buf, size_t len)
3553 {
3554 /* If array is inactive, we can reduce the component size, but
3555 * not increase it (except from 0).
3556 * If array is active, we can try an on-line resize
3557 */
3558 sector_t sectors;
3559 int err = strict_blocks_to_sectors(buf, &sectors);
3560
3561 if (err < 0)
3562 return err;
3563 if (mddev->pers) {
3564 err = update_size(mddev, sectors);
3565 md_update_sb(mddev, 1);
3566 } else {
3567 if (mddev->dev_sectors == 0 ||
3568 mddev->dev_sectors > sectors)
3569 mddev->dev_sectors = sectors;
3570 else
3571 err = -ENOSPC;
3572 }
3573 return err ? err : len;
3574 }
3575
3576 static struct md_sysfs_entry md_size =
3577 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3578
3579
3580 /* Metdata version.
3581 * This is one of
3582 * 'none' for arrays with no metadata (good luck...)
3583 * 'external' for arrays with externally managed metadata,
3584 * or N.M for internally known formats
3585 */
3586 static ssize_t
3587 metadata_show(mddev_t *mddev, char *page)
3588 {
3589 if (mddev->persistent)
3590 return sprintf(page, "%d.%d\n",
3591 mddev->major_version, mddev->minor_version);
3592 else if (mddev->external)
3593 return sprintf(page, "external:%s\n", mddev->metadata_type);
3594 else
3595 return sprintf(page, "none\n");
3596 }
3597
3598 static ssize_t
3599 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3600 {
3601 int major, minor;
3602 char *e;
3603 /* Changing the details of 'external' metadata is
3604 * always permitted. Otherwise there must be
3605 * no devices attached to the array.
3606 */
3607 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3608 ;
3609 else if (!list_empty(&mddev->disks))
3610 return -EBUSY;
3611
3612 if (cmd_match(buf, "none")) {
3613 mddev->persistent = 0;
3614 mddev->external = 0;
3615 mddev->major_version = 0;
3616 mddev->minor_version = 90;
3617 return len;
3618 }
3619 if (strncmp(buf, "external:", 9) == 0) {
3620 size_t namelen = len-9;
3621 if (namelen >= sizeof(mddev->metadata_type))
3622 namelen = sizeof(mddev->metadata_type)-1;
3623 strncpy(mddev->metadata_type, buf+9, namelen);
3624 mddev->metadata_type[namelen] = 0;
3625 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3626 mddev->metadata_type[--namelen] = 0;
3627 mddev->persistent = 0;
3628 mddev->external = 1;
3629 mddev->major_version = 0;
3630 mddev->minor_version = 90;
3631 return len;
3632 }
3633 major = simple_strtoul(buf, &e, 10);
3634 if (e==buf || *e != '.')
3635 return -EINVAL;
3636 buf = e+1;
3637 minor = simple_strtoul(buf, &e, 10);
3638 if (e==buf || (*e && *e != '\n') )
3639 return -EINVAL;
3640 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3641 return -ENOENT;
3642 mddev->major_version = major;
3643 mddev->minor_version = minor;
3644 mddev->persistent = 1;
3645 mddev->external = 0;
3646 return len;
3647 }
3648
3649 static struct md_sysfs_entry md_metadata =
3650 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3651
3652 static ssize_t
3653 action_show(mddev_t *mddev, char *page)
3654 {
3655 char *type = "idle";
3656 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3657 type = "frozen";
3658 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3659 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3660 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3661 type = "reshape";
3662 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3663 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3664 type = "resync";
3665 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3666 type = "check";
3667 else
3668 type = "repair";
3669 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3670 type = "recover";
3671 }
3672 return sprintf(page, "%s\n", type);
3673 }
3674
3675 static ssize_t
3676 action_store(mddev_t *mddev, const char *page, size_t len)
3677 {
3678 if (!mddev->pers || !mddev->pers->sync_request)
3679 return -EINVAL;
3680
3681 if (cmd_match(page, "frozen"))
3682 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3683 else
3684 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3685
3686 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
3687 if (mddev->sync_thread) {
3688 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3689 md_unregister_thread(mddev->sync_thread);
3690 mddev->sync_thread = NULL;
3691 mddev->recovery = 0;
3692 }
3693 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3694 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3695 return -EBUSY;
3696 else if (cmd_match(page, "resync"))
3697 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3698 else if (cmd_match(page, "recover")) {
3699 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3700 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3701 } else if (cmd_match(page, "reshape")) {
3702 int err;
3703 if (mddev->pers->start_reshape == NULL)
3704 return -EINVAL;
3705 err = mddev->pers->start_reshape(mddev);
3706 if (err)
3707 return err;
3708 sysfs_notify(&mddev->kobj, NULL, "degraded");
3709 } else {
3710 if (cmd_match(page, "check"))
3711 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3712 else if (!cmd_match(page, "repair"))
3713 return -EINVAL;
3714 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3715 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3716 }
3717 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3718 md_wakeup_thread(mddev->thread);
3719 sysfs_notify_dirent_safe(mddev->sysfs_action);
3720 return len;
3721 }
3722
3723 static ssize_t
3724 mismatch_cnt_show(mddev_t *mddev, char *page)
3725 {
3726 return sprintf(page, "%llu\n",
3727 (unsigned long long) mddev->resync_mismatches);
3728 }
3729
3730 static struct md_sysfs_entry md_scan_mode =
3731 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3732
3733
3734 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3735
3736 static ssize_t
3737 sync_min_show(mddev_t *mddev, char *page)
3738 {
3739 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3740 mddev->sync_speed_min ? "local": "system");
3741 }
3742
3743 static ssize_t
3744 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3745 {
3746 int min;
3747 char *e;
3748 if (strncmp(buf, "system", 6)==0) {
3749 mddev->sync_speed_min = 0;
3750 return len;
3751 }
3752 min = simple_strtoul(buf, &e, 10);
3753 if (buf == e || (*e && *e != '\n') || min <= 0)
3754 return -EINVAL;
3755 mddev->sync_speed_min = min;
3756 return len;
3757 }
3758
3759 static struct md_sysfs_entry md_sync_min =
3760 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3761
3762 static ssize_t
3763 sync_max_show(mddev_t *mddev, char *page)
3764 {
3765 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3766 mddev->sync_speed_max ? "local": "system");
3767 }
3768
3769 static ssize_t
3770 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3771 {
3772 int max;
3773 char *e;
3774 if (strncmp(buf, "system", 6)==0) {
3775 mddev->sync_speed_max = 0;
3776 return len;
3777 }
3778 max = simple_strtoul(buf, &e, 10);
3779 if (buf == e || (*e && *e != '\n') || max <= 0)
3780 return -EINVAL;
3781 mddev->sync_speed_max = max;
3782 return len;
3783 }
3784
3785 static struct md_sysfs_entry md_sync_max =
3786 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3787
3788 static ssize_t
3789 degraded_show(mddev_t *mddev, char *page)
3790 {
3791 return sprintf(page, "%d\n", mddev->degraded);
3792 }
3793 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3794
3795 static ssize_t
3796 sync_force_parallel_show(mddev_t *mddev, char *page)
3797 {
3798 return sprintf(page, "%d\n", mddev->parallel_resync);
3799 }
3800
3801 static ssize_t
3802 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3803 {
3804 long n;
3805
3806 if (strict_strtol(buf, 10, &n))
3807 return -EINVAL;
3808
3809 if (n != 0 && n != 1)
3810 return -EINVAL;
3811
3812 mddev->parallel_resync = n;
3813
3814 if (mddev->sync_thread)
3815 wake_up(&resync_wait);
3816
3817 return len;
3818 }
3819
3820 /* force parallel resync, even with shared block devices */
3821 static struct md_sysfs_entry md_sync_force_parallel =
3822 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3823 sync_force_parallel_show, sync_force_parallel_store);
3824
3825 static ssize_t
3826 sync_speed_show(mddev_t *mddev, char *page)
3827 {
3828 unsigned long resync, dt, db;
3829 if (mddev->curr_resync == 0)
3830 return sprintf(page, "none\n");
3831 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3832 dt = (jiffies - mddev->resync_mark) / HZ;
3833 if (!dt) dt++;
3834 db = resync - mddev->resync_mark_cnt;
3835 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3836 }
3837
3838 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3839
3840 static ssize_t
3841 sync_completed_show(mddev_t *mddev, char *page)
3842 {
3843 unsigned long max_sectors, resync;
3844
3845 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3846 return sprintf(page, "none\n");
3847
3848 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3849 max_sectors = mddev->resync_max_sectors;
3850 else
3851 max_sectors = mddev->dev_sectors;
3852
3853 resync = mddev->curr_resync_completed;
3854 return sprintf(page, "%lu / %lu\n", resync, max_sectors);
3855 }
3856
3857 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3858
3859 static ssize_t
3860 min_sync_show(mddev_t *mddev, char *page)
3861 {
3862 return sprintf(page, "%llu\n",
3863 (unsigned long long)mddev->resync_min);
3864 }
3865 static ssize_t
3866 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3867 {
3868 unsigned long long min;
3869 if (strict_strtoull(buf, 10, &min))
3870 return -EINVAL;
3871 if (min > mddev->resync_max)
3872 return -EINVAL;
3873 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3874 return -EBUSY;
3875
3876 /* Must be a multiple of chunk_size */
3877 if (mddev->chunk_sectors) {
3878 sector_t temp = min;
3879 if (sector_div(temp, mddev->chunk_sectors))
3880 return -EINVAL;
3881 }
3882 mddev->resync_min = min;
3883
3884 return len;
3885 }
3886
3887 static struct md_sysfs_entry md_min_sync =
3888 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3889
3890 static ssize_t
3891 max_sync_show(mddev_t *mddev, char *page)
3892 {
3893 if (mddev->resync_max == MaxSector)
3894 return sprintf(page, "max\n");
3895 else
3896 return sprintf(page, "%llu\n",
3897 (unsigned long long)mddev->resync_max);
3898 }
3899 static ssize_t
3900 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3901 {
3902 if (strncmp(buf, "max", 3) == 0)
3903 mddev->resync_max = MaxSector;
3904 else {
3905 unsigned long long max;
3906 if (strict_strtoull(buf, 10, &max))
3907 return -EINVAL;
3908 if (max < mddev->resync_min)
3909 return -EINVAL;
3910 if (max < mddev->resync_max &&
3911 mddev->ro == 0 &&
3912 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3913 return -EBUSY;
3914
3915 /* Must be a multiple of chunk_size */
3916 if (mddev->chunk_sectors) {
3917 sector_t temp = max;
3918 if (sector_div(temp, mddev->chunk_sectors))
3919 return -EINVAL;
3920 }
3921 mddev->resync_max = max;
3922 }
3923 wake_up(&mddev->recovery_wait);
3924 return len;
3925 }
3926
3927 static struct md_sysfs_entry md_max_sync =
3928 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3929
3930 static ssize_t
3931 suspend_lo_show(mddev_t *mddev, char *page)
3932 {
3933 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3934 }
3935
3936 static ssize_t
3937 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3938 {
3939 char *e;
3940 unsigned long long new = simple_strtoull(buf, &e, 10);
3941
3942 if (mddev->pers == NULL ||
3943 mddev->pers->quiesce == NULL)
3944 return -EINVAL;
3945 if (buf == e || (*e && *e != '\n'))
3946 return -EINVAL;
3947 if (new >= mddev->suspend_hi ||
3948 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3949 mddev->suspend_lo = new;
3950 mddev->pers->quiesce(mddev, 2);
3951 return len;
3952 } else
3953 return -EINVAL;
3954 }
3955 static struct md_sysfs_entry md_suspend_lo =
3956 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3957
3958
3959 static ssize_t
3960 suspend_hi_show(mddev_t *mddev, char *page)
3961 {
3962 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3963 }
3964
3965 static ssize_t
3966 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3967 {
3968 char *e;
3969 unsigned long long new = simple_strtoull(buf, &e, 10);
3970
3971 if (mddev->pers == NULL ||
3972 mddev->pers->quiesce == NULL)
3973 return -EINVAL;
3974 if (buf == e || (*e && *e != '\n'))
3975 return -EINVAL;
3976 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3977 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3978 mddev->suspend_hi = new;
3979 mddev->pers->quiesce(mddev, 1);
3980 mddev->pers->quiesce(mddev, 0);
3981 return len;
3982 } else
3983 return -EINVAL;
3984 }
3985 static struct md_sysfs_entry md_suspend_hi =
3986 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3987
3988 static ssize_t
3989 reshape_position_show(mddev_t *mddev, char *page)
3990 {
3991 if (mddev->reshape_position != MaxSector)
3992 return sprintf(page, "%llu\n",
3993 (unsigned long long)mddev->reshape_position);
3994 strcpy(page, "none\n");
3995 return 5;
3996 }
3997
3998 static ssize_t
3999 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
4000 {
4001 char *e;
4002 unsigned long long new = simple_strtoull(buf, &e, 10);
4003 if (mddev->pers)
4004 return -EBUSY;
4005 if (buf == e || (*e && *e != '\n'))
4006 return -EINVAL;
4007 mddev->reshape_position = new;
4008 mddev->delta_disks = 0;
4009 mddev->new_level = mddev->level;
4010 mddev->new_layout = mddev->layout;
4011 mddev->new_chunk_sectors = mddev->chunk_sectors;
4012 return len;
4013 }
4014
4015 static struct md_sysfs_entry md_reshape_position =
4016 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4017 reshape_position_store);
4018
4019 static ssize_t
4020 array_size_show(mddev_t *mddev, char *page)
4021 {
4022 if (mddev->external_size)
4023 return sprintf(page, "%llu\n",
4024 (unsigned long long)mddev->array_sectors/2);
4025 else
4026 return sprintf(page, "default\n");
4027 }
4028
4029 static ssize_t
4030 array_size_store(mddev_t *mddev, const char *buf, size_t len)
4031 {
4032 sector_t sectors;
4033
4034 if (strncmp(buf, "default", 7) == 0) {
4035 if (mddev->pers)
4036 sectors = mddev->pers->size(mddev, 0, 0);
4037 else
4038 sectors = mddev->array_sectors;
4039
4040 mddev->external_size = 0;
4041 } else {
4042 if (strict_blocks_to_sectors(buf, &sectors) < 0)
4043 return -EINVAL;
4044 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4045 return -E2BIG;
4046
4047 mddev->external_size = 1;
4048 }
4049
4050 mddev->array_sectors = sectors;
4051 set_capacity(mddev->gendisk, mddev->array_sectors);
4052 if (mddev->pers)
4053 revalidate_disk(mddev->gendisk);
4054
4055 return len;
4056 }
4057
4058 static struct md_sysfs_entry md_array_size =
4059 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4060 array_size_store);
4061
4062 static struct attribute *md_default_attrs[] = {
4063 &md_level.attr,
4064 &md_layout.attr,
4065 &md_raid_disks.attr,
4066 &md_chunk_size.attr,
4067 &md_size.attr,
4068 &md_resync_start.attr,
4069 &md_metadata.attr,
4070 &md_new_device.attr,
4071 &md_safe_delay.attr,
4072 &md_array_state.attr,
4073 &md_reshape_position.attr,
4074 &md_array_size.attr,
4075 &max_corr_read_errors.attr,
4076 NULL,
4077 };
4078
4079 static struct attribute *md_redundancy_attrs[] = {
4080 &md_scan_mode.attr,
4081 &md_mismatches.attr,
4082 &md_sync_min.attr,
4083 &md_sync_max.attr,
4084 &md_sync_speed.attr,
4085 &md_sync_force_parallel.attr,
4086 &md_sync_completed.attr,
4087 &md_min_sync.attr,
4088 &md_max_sync.attr,
4089 &md_suspend_lo.attr,
4090 &md_suspend_hi.attr,
4091 &md_bitmap.attr,
4092 &md_degraded.attr,
4093 NULL,
4094 };
4095 static struct attribute_group md_redundancy_group = {
4096 .name = NULL,
4097 .attrs = md_redundancy_attrs,
4098 };
4099
4100
4101 static ssize_t
4102 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4103 {
4104 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4105 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4106 ssize_t rv;
4107
4108 if (!entry->show)
4109 return -EIO;
4110 rv = mddev_lock(mddev);
4111 if (!rv) {
4112 rv = entry->show(mddev, page);
4113 mddev_unlock(mddev);
4114 }
4115 return rv;
4116 }
4117
4118 static ssize_t
4119 md_attr_store(struct kobject *kobj, struct attribute *attr,
4120 const char *page, size_t length)
4121 {
4122 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4123 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4124 ssize_t rv;
4125
4126 if (!entry->store)
4127 return -EIO;
4128 if (!capable(CAP_SYS_ADMIN))
4129 return -EACCES;
4130 rv = mddev_lock(mddev);
4131 if (mddev->hold_active == UNTIL_IOCTL)
4132 mddev->hold_active = 0;
4133 if (!rv) {
4134 rv = entry->store(mddev, page, length);
4135 mddev_unlock(mddev);
4136 }
4137 return rv;
4138 }
4139
4140 static void md_free(struct kobject *ko)
4141 {
4142 mddev_t *mddev = container_of(ko, mddev_t, kobj);
4143
4144 if (mddev->sysfs_state)
4145 sysfs_put(mddev->sysfs_state);
4146
4147 if (mddev->gendisk) {
4148 del_gendisk(mddev->gendisk);
4149 put_disk(mddev->gendisk);
4150 }
4151 if (mddev->queue)
4152 blk_cleanup_queue(mddev->queue);
4153
4154 kfree(mddev);
4155 }
4156
4157 static const struct sysfs_ops md_sysfs_ops = {
4158 .show = md_attr_show,
4159 .store = md_attr_store,
4160 };
4161 static struct kobj_type md_ktype = {
4162 .release = md_free,
4163 .sysfs_ops = &md_sysfs_ops,
4164 .default_attrs = md_default_attrs,
4165 };
4166
4167 int mdp_major = 0;
4168
4169 static void mddev_delayed_delete(struct work_struct *ws)
4170 {
4171 mddev_t *mddev = container_of(ws, mddev_t, del_work);
4172
4173 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4174 kobject_del(&mddev->kobj);
4175 kobject_put(&mddev->kobj);
4176 }
4177
4178 static int md_alloc(dev_t dev, char *name)
4179 {
4180 static DEFINE_MUTEX(disks_mutex);
4181 mddev_t *mddev = mddev_find(dev);
4182 struct gendisk *disk;
4183 int partitioned;
4184 int shift;
4185 int unit;
4186 int error;
4187
4188 if (!mddev)
4189 return -ENODEV;
4190
4191 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4192 shift = partitioned ? MdpMinorShift : 0;
4193 unit = MINOR(mddev->unit) >> shift;
4194
4195 /* wait for any previous instance if this device
4196 * to be completed removed (mddev_delayed_delete).
4197 */
4198 flush_scheduled_work();
4199
4200 mutex_lock(&disks_mutex);
4201 error = -EEXIST;
4202 if (mddev->gendisk)
4203 goto abort;
4204
4205 if (name) {
4206 /* Need to ensure that 'name' is not a duplicate.
4207 */
4208 mddev_t *mddev2;
4209 spin_lock(&all_mddevs_lock);
4210
4211 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4212 if (mddev2->gendisk &&
4213 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4214 spin_unlock(&all_mddevs_lock);
4215 goto abort;
4216 }
4217 spin_unlock(&all_mddevs_lock);
4218 }
4219
4220 error = -ENOMEM;
4221 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4222 if (!mddev->queue)
4223 goto abort;
4224 mddev->queue->queuedata = mddev;
4225
4226 /* Can be unlocked because the queue is new: no concurrency */
4227 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue);
4228
4229 blk_queue_make_request(mddev->queue, md_make_request);
4230
4231 disk = alloc_disk(1 << shift);
4232 if (!disk) {
4233 blk_cleanup_queue(mddev->queue);
4234 mddev->queue = NULL;
4235 goto abort;
4236 }
4237 disk->major = MAJOR(mddev->unit);
4238 disk->first_minor = unit << shift;
4239 if (name)
4240 strcpy(disk->disk_name, name);
4241 else if (partitioned)
4242 sprintf(disk->disk_name, "md_d%d", unit);
4243 else
4244 sprintf(disk->disk_name, "md%d", unit);
4245 disk->fops = &md_fops;
4246 disk->private_data = mddev;
4247 disk->queue = mddev->queue;
4248 /* Allow extended partitions. This makes the
4249 * 'mdp' device redundant, but we can't really
4250 * remove it now.
4251 */
4252 disk->flags |= GENHD_FL_EXT_DEVT;
4253 add_disk(disk);
4254 mddev->gendisk = disk;
4255 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4256 &disk_to_dev(disk)->kobj, "%s", "md");
4257 if (error) {
4258 /* This isn't possible, but as kobject_init_and_add is marked
4259 * __must_check, we must do something with the result
4260 */
4261 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4262 disk->disk_name);
4263 error = 0;
4264 }
4265 if (mddev->kobj.sd &&
4266 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4267 printk(KERN_DEBUG "pointless warning\n");
4268 abort:
4269 mutex_unlock(&disks_mutex);
4270 if (!error && mddev->kobj.sd) {
4271 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4272 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
4273 }
4274 mddev_put(mddev);
4275 return error;
4276 }
4277
4278 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4279 {
4280 md_alloc(dev, NULL);
4281 return NULL;
4282 }
4283
4284 static int add_named_array(const char *val, struct kernel_param *kp)
4285 {
4286 /* val must be "md_*" where * is not all digits.
4287 * We allocate an array with a large free minor number, and
4288 * set the name to val. val must not already be an active name.
4289 */
4290 int len = strlen(val);
4291 char buf[DISK_NAME_LEN];
4292
4293 while (len && val[len-1] == '\n')
4294 len--;
4295 if (len >= DISK_NAME_LEN)
4296 return -E2BIG;
4297 strlcpy(buf, val, len+1);
4298 if (strncmp(buf, "md_", 3) != 0)
4299 return -EINVAL;
4300 return md_alloc(0, buf);
4301 }
4302
4303 static void md_safemode_timeout(unsigned long data)
4304 {
4305 mddev_t *mddev = (mddev_t *) data;
4306
4307 if (!atomic_read(&mddev->writes_pending)) {
4308 mddev->safemode = 1;
4309 if (mddev->external)
4310 sysfs_notify_dirent_safe(mddev->sysfs_state);
4311 }
4312 md_wakeup_thread(mddev->thread);
4313 }
4314
4315 static int start_dirty_degraded;
4316
4317 int md_run(mddev_t *mddev)
4318 {
4319 int err;
4320 mdk_rdev_t *rdev;
4321 struct mdk_personality *pers;
4322
4323 if (list_empty(&mddev->disks))
4324 /* cannot run an array with no devices.. */
4325 return -EINVAL;
4326
4327 if (mddev->pers)
4328 return -EBUSY;
4329 /* Cannot run until previous stop completes properly */
4330 if (mddev->sysfs_active)
4331 return -EBUSY;
4332
4333 /*
4334 * Analyze all RAID superblock(s)
4335 */
4336 if (!mddev->raid_disks) {
4337 if (!mddev->persistent)
4338 return -EINVAL;
4339 analyze_sbs(mddev);
4340 }
4341
4342 if (mddev->level != LEVEL_NONE)
4343 request_module("md-level-%d", mddev->level);
4344 else if (mddev->clevel[0])
4345 request_module("md-%s", mddev->clevel);
4346
4347 /*
4348 * Drop all container device buffers, from now on
4349 * the only valid external interface is through the md
4350 * device.
4351 */
4352 list_for_each_entry(rdev, &mddev->disks, same_set) {
4353 if (test_bit(Faulty, &rdev->flags))
4354 continue;
4355 sync_blockdev(rdev->bdev);
4356 invalidate_bdev(rdev->bdev);
4357
4358 /* perform some consistency tests on the device.
4359 * We don't want the data to overlap the metadata,
4360 * Internal Bitmap issues have been handled elsewhere.
4361 */
4362 if (rdev->data_offset < rdev->sb_start) {
4363 if (mddev->dev_sectors &&
4364 rdev->data_offset + mddev->dev_sectors
4365 > rdev->sb_start) {
4366 printk("md: %s: data overlaps metadata\n",
4367 mdname(mddev));
4368 return -EINVAL;
4369 }
4370 } else {
4371 if (rdev->sb_start + rdev->sb_size/512
4372 > rdev->data_offset) {
4373 printk("md: %s: metadata overlaps data\n",
4374 mdname(mddev));
4375 return -EINVAL;
4376 }
4377 }
4378 sysfs_notify_dirent_safe(rdev->sysfs_state);
4379 }
4380
4381 spin_lock(&pers_lock);
4382 pers = find_pers(mddev->level, mddev->clevel);
4383 if (!pers || !try_module_get(pers->owner)) {
4384 spin_unlock(&pers_lock);
4385 if (mddev->level != LEVEL_NONE)
4386 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4387 mddev->level);
4388 else
4389 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4390 mddev->clevel);
4391 return -EINVAL;
4392 }
4393 mddev->pers = pers;
4394 spin_unlock(&pers_lock);
4395 if (mddev->level != pers->level) {
4396 mddev->level = pers->level;
4397 mddev->new_level = pers->level;
4398 }
4399 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4400
4401 if (mddev->reshape_position != MaxSector &&
4402 pers->start_reshape == NULL) {
4403 /* This personality cannot handle reshaping... */
4404 mddev->pers = NULL;
4405 module_put(pers->owner);
4406 return -EINVAL;
4407 }
4408
4409 if (pers->sync_request) {
4410 /* Warn if this is a potentially silly
4411 * configuration.
4412 */
4413 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4414 mdk_rdev_t *rdev2;
4415 int warned = 0;
4416
4417 list_for_each_entry(rdev, &mddev->disks, same_set)
4418 list_for_each_entry(rdev2, &mddev->disks, same_set) {
4419 if (rdev < rdev2 &&
4420 rdev->bdev->bd_contains ==
4421 rdev2->bdev->bd_contains) {
4422 printk(KERN_WARNING
4423 "%s: WARNING: %s appears to be"
4424 " on the same physical disk as"
4425 " %s.\n",
4426 mdname(mddev),
4427 bdevname(rdev->bdev,b),
4428 bdevname(rdev2->bdev,b2));
4429 warned = 1;
4430 }
4431 }
4432
4433 if (warned)
4434 printk(KERN_WARNING
4435 "True protection against single-disk"
4436 " failure might be compromised.\n");
4437 }
4438
4439 mddev->recovery = 0;
4440 /* may be over-ridden by personality */
4441 mddev->resync_max_sectors = mddev->dev_sectors;
4442
4443 mddev->ok_start_degraded = start_dirty_degraded;
4444
4445 if (start_readonly && mddev->ro == 0)
4446 mddev->ro = 2; /* read-only, but switch on first write */
4447
4448 err = mddev->pers->run(mddev);
4449 if (err)
4450 printk(KERN_ERR "md: pers->run() failed ...\n");
4451 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4452 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4453 " but 'external_size' not in effect?\n", __func__);
4454 printk(KERN_ERR
4455 "md: invalid array_size %llu > default size %llu\n",
4456 (unsigned long long)mddev->array_sectors / 2,
4457 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4458 err = -EINVAL;
4459 mddev->pers->stop(mddev);
4460 }
4461 if (err == 0 && mddev->pers->sync_request) {
4462 err = bitmap_create(mddev);
4463 if (err) {
4464 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4465 mdname(mddev), err);
4466 mddev->pers->stop(mddev);
4467 }
4468 }
4469 if (err) {
4470 module_put(mddev->pers->owner);
4471 mddev->pers = NULL;
4472 bitmap_destroy(mddev);
4473 return err;
4474 }
4475 if (mddev->pers->sync_request) {
4476 if (mddev->kobj.sd &&
4477 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4478 printk(KERN_WARNING
4479 "md: cannot register extra attributes for %s\n",
4480 mdname(mddev));
4481 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
4482 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4483 mddev->ro = 0;
4484
4485 atomic_set(&mddev->writes_pending,0);
4486 atomic_set(&mddev->max_corr_read_errors,
4487 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
4488 mddev->safemode = 0;
4489 mddev->safemode_timer.function = md_safemode_timeout;
4490 mddev->safemode_timer.data = (unsigned long) mddev;
4491 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4492 mddev->in_sync = 1;
4493
4494 list_for_each_entry(rdev, &mddev->disks, same_set)
4495 if (rdev->raid_disk >= 0) {
4496 char nm[20];
4497 sprintf(nm, "rd%d", rdev->raid_disk);
4498 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
4499 /* failure here is OK */;
4500 }
4501
4502 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4503
4504 if (mddev->flags)
4505 md_update_sb(mddev, 0);
4506
4507 md_wakeup_thread(mddev->thread);
4508 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4509
4510 md_new_event(mddev);
4511 sysfs_notify_dirent_safe(mddev->sysfs_state);
4512 sysfs_notify_dirent_safe(mddev->sysfs_action);
4513 sysfs_notify(&mddev->kobj, NULL, "degraded");
4514 return 0;
4515 }
4516 EXPORT_SYMBOL_GPL(md_run);
4517
4518 static int do_md_run(mddev_t *mddev)
4519 {
4520 int err;
4521
4522 err = md_run(mddev);
4523 if (err)
4524 goto out;
4525 err = bitmap_load(mddev);
4526 if (err) {
4527 bitmap_destroy(mddev);
4528 goto out;
4529 }
4530 set_capacity(mddev->gendisk, mddev->array_sectors);
4531 revalidate_disk(mddev->gendisk);
4532 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4533 out:
4534 return err;
4535 }
4536
4537 static int restart_array(mddev_t *mddev)
4538 {
4539 struct gendisk *disk = mddev->gendisk;
4540
4541 /* Complain if it has no devices */
4542 if (list_empty(&mddev->disks))
4543 return -ENXIO;
4544 if (!mddev->pers)
4545 return -EINVAL;
4546 if (!mddev->ro)
4547 return -EBUSY;
4548 mddev->safemode = 0;
4549 mddev->ro = 0;
4550 set_disk_ro(disk, 0);
4551 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4552 mdname(mddev));
4553 /* Kick recovery or resync if necessary */
4554 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4555 md_wakeup_thread(mddev->thread);
4556 md_wakeup_thread(mddev->sync_thread);
4557 sysfs_notify_dirent_safe(mddev->sysfs_state);
4558 return 0;
4559 }
4560
4561 /* similar to deny_write_access, but accounts for our holding a reference
4562 * to the file ourselves */
4563 static int deny_bitmap_write_access(struct file * file)
4564 {
4565 struct inode *inode = file->f_mapping->host;
4566
4567 spin_lock(&inode->i_lock);
4568 if (atomic_read(&inode->i_writecount) > 1) {
4569 spin_unlock(&inode->i_lock);
4570 return -ETXTBSY;
4571 }
4572 atomic_set(&inode->i_writecount, -1);
4573 spin_unlock(&inode->i_lock);
4574
4575 return 0;
4576 }
4577
4578 void restore_bitmap_write_access(struct file *file)
4579 {
4580 struct inode *inode = file->f_mapping->host;
4581
4582 spin_lock(&inode->i_lock);
4583 atomic_set(&inode->i_writecount, 1);
4584 spin_unlock(&inode->i_lock);
4585 }
4586
4587 static void md_clean(mddev_t *mddev)
4588 {
4589 mddev->array_sectors = 0;
4590 mddev->external_size = 0;
4591 mddev->dev_sectors = 0;
4592 mddev->raid_disks = 0;
4593 mddev->recovery_cp = 0;
4594 mddev->resync_min = 0;
4595 mddev->resync_max = MaxSector;
4596 mddev->reshape_position = MaxSector;
4597 mddev->external = 0;
4598 mddev->persistent = 0;
4599 mddev->level = LEVEL_NONE;
4600 mddev->clevel[0] = 0;
4601 mddev->flags = 0;
4602 mddev->ro = 0;
4603 mddev->metadata_type[0] = 0;
4604 mddev->chunk_sectors = 0;
4605 mddev->ctime = mddev->utime = 0;
4606 mddev->layout = 0;
4607 mddev->max_disks = 0;
4608 mddev->events = 0;
4609 mddev->can_decrease_events = 0;
4610 mddev->delta_disks = 0;
4611 mddev->new_level = LEVEL_NONE;
4612 mddev->new_layout = 0;
4613 mddev->new_chunk_sectors = 0;
4614 mddev->curr_resync = 0;
4615 mddev->resync_mismatches = 0;
4616 mddev->suspend_lo = mddev->suspend_hi = 0;
4617 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4618 mddev->recovery = 0;
4619 mddev->in_sync = 0;
4620 mddev->degraded = 0;
4621 mddev->safemode = 0;
4622 mddev->bitmap_info.offset = 0;
4623 mddev->bitmap_info.default_offset = 0;
4624 mddev->bitmap_info.chunksize = 0;
4625 mddev->bitmap_info.daemon_sleep = 0;
4626 mddev->bitmap_info.max_write_behind = 0;
4627 mddev->plug = NULL;
4628 }
4629
4630 void md_stop_writes(mddev_t *mddev)
4631 {
4632 if (mddev->sync_thread) {
4633 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4634 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4635 md_unregister_thread(mddev->sync_thread);
4636 mddev->sync_thread = NULL;
4637 }
4638
4639 del_timer_sync(&mddev->safemode_timer);
4640
4641 bitmap_flush(mddev);
4642 md_super_wait(mddev);
4643
4644 if (!mddev->in_sync || mddev->flags) {
4645 /* mark array as shutdown cleanly */
4646 mddev->in_sync = 1;
4647 md_update_sb(mddev, 1);
4648 }
4649 }
4650 EXPORT_SYMBOL_GPL(md_stop_writes);
4651
4652 void md_stop(mddev_t *mddev)
4653 {
4654 mddev->pers->stop(mddev);
4655 if (mddev->pers->sync_request && mddev->to_remove == NULL)
4656 mddev->to_remove = &md_redundancy_group;
4657 module_put(mddev->pers->owner);
4658 mddev->pers = NULL;
4659 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4660 }
4661 EXPORT_SYMBOL_GPL(md_stop);
4662
4663 static int md_set_readonly(mddev_t *mddev, int is_open)
4664 {
4665 int err = 0;
4666 mutex_lock(&mddev->open_mutex);
4667 if (atomic_read(&mddev->openers) > is_open) {
4668 printk("md: %s still in use.\n",mdname(mddev));
4669 err = -EBUSY;
4670 goto out;
4671 }
4672 if (mddev->pers) {
4673 md_stop_writes(mddev);
4674
4675 err = -ENXIO;
4676 if (mddev->ro==1)
4677 goto out;
4678 mddev->ro = 1;
4679 set_disk_ro(mddev->gendisk, 1);
4680 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4681 sysfs_notify_dirent_safe(mddev->sysfs_state);
4682 err = 0;
4683 }
4684 out:
4685 mutex_unlock(&mddev->open_mutex);
4686 return err;
4687 }
4688
4689 /* mode:
4690 * 0 - completely stop and dis-assemble array
4691 * 2 - stop but do not disassemble array
4692 */
4693 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4694 {
4695 struct gendisk *disk = mddev->gendisk;
4696 mdk_rdev_t *rdev;
4697
4698 mutex_lock(&mddev->open_mutex);
4699 if (atomic_read(&mddev->openers) > is_open ||
4700 mddev->sysfs_active) {
4701 printk("md: %s still in use.\n",mdname(mddev));
4702 mutex_unlock(&mddev->open_mutex);
4703 return -EBUSY;
4704 }
4705
4706 if (mddev->pers) {
4707 if (mddev->ro)
4708 set_disk_ro(disk, 0);
4709
4710 md_stop_writes(mddev);
4711 md_stop(mddev);
4712 mddev->queue->merge_bvec_fn = NULL;
4713 mddev->queue->unplug_fn = NULL;
4714 mddev->queue->backing_dev_info.congested_fn = NULL;
4715
4716 /* tell userspace to handle 'inactive' */
4717 sysfs_notify_dirent_safe(mddev->sysfs_state);
4718
4719 list_for_each_entry(rdev, &mddev->disks, same_set)
4720 if (rdev->raid_disk >= 0) {
4721 char nm[20];
4722 sprintf(nm, "rd%d", rdev->raid_disk);
4723 sysfs_remove_link(&mddev->kobj, nm);
4724 }
4725
4726 set_capacity(disk, 0);
4727 mutex_unlock(&mddev->open_mutex);
4728 revalidate_disk(disk);
4729
4730 if (mddev->ro)
4731 mddev->ro = 0;
4732 } else
4733 mutex_unlock(&mddev->open_mutex);
4734 /*
4735 * Free resources if final stop
4736 */
4737 if (mode == 0) {
4738 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4739
4740 bitmap_destroy(mddev);
4741 if (mddev->bitmap_info.file) {
4742 restore_bitmap_write_access(mddev->bitmap_info.file);
4743 fput(mddev->bitmap_info.file);
4744 mddev->bitmap_info.file = NULL;
4745 }
4746 mddev->bitmap_info.offset = 0;
4747
4748 export_array(mddev);
4749
4750 md_clean(mddev);
4751 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4752 if (mddev->hold_active == UNTIL_STOP)
4753 mddev->hold_active = 0;
4754 }
4755 blk_integrity_unregister(disk);
4756 md_new_event(mddev);
4757 sysfs_notify_dirent_safe(mddev->sysfs_state);
4758 return 0;
4759 }
4760
4761 #ifndef MODULE
4762 static void autorun_array(mddev_t *mddev)
4763 {
4764 mdk_rdev_t *rdev;
4765 int err;
4766
4767 if (list_empty(&mddev->disks))
4768 return;
4769
4770 printk(KERN_INFO "md: running: ");
4771
4772 list_for_each_entry(rdev, &mddev->disks, same_set) {
4773 char b[BDEVNAME_SIZE];
4774 printk("<%s>", bdevname(rdev->bdev,b));
4775 }
4776 printk("\n");
4777
4778 err = do_md_run(mddev);
4779 if (err) {
4780 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4781 do_md_stop(mddev, 0, 0);
4782 }
4783 }
4784
4785 /*
4786 * lets try to run arrays based on all disks that have arrived
4787 * until now. (those are in pending_raid_disks)
4788 *
4789 * the method: pick the first pending disk, collect all disks with
4790 * the same UUID, remove all from the pending list and put them into
4791 * the 'same_array' list. Then order this list based on superblock
4792 * update time (freshest comes first), kick out 'old' disks and
4793 * compare superblocks. If everything's fine then run it.
4794 *
4795 * If "unit" is allocated, then bump its reference count
4796 */
4797 static void autorun_devices(int part)
4798 {
4799 mdk_rdev_t *rdev0, *rdev, *tmp;
4800 mddev_t *mddev;
4801 char b[BDEVNAME_SIZE];
4802
4803 printk(KERN_INFO "md: autorun ...\n");
4804 while (!list_empty(&pending_raid_disks)) {
4805 int unit;
4806 dev_t dev;
4807 LIST_HEAD(candidates);
4808 rdev0 = list_entry(pending_raid_disks.next,
4809 mdk_rdev_t, same_set);
4810
4811 printk(KERN_INFO "md: considering %s ...\n",
4812 bdevname(rdev0->bdev,b));
4813 INIT_LIST_HEAD(&candidates);
4814 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4815 if (super_90_load(rdev, rdev0, 0) >= 0) {
4816 printk(KERN_INFO "md: adding %s ...\n",
4817 bdevname(rdev->bdev,b));
4818 list_move(&rdev->same_set, &candidates);
4819 }
4820 /*
4821 * now we have a set of devices, with all of them having
4822 * mostly sane superblocks. It's time to allocate the
4823 * mddev.
4824 */
4825 if (part) {
4826 dev = MKDEV(mdp_major,
4827 rdev0->preferred_minor << MdpMinorShift);
4828 unit = MINOR(dev) >> MdpMinorShift;
4829 } else {
4830 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4831 unit = MINOR(dev);
4832 }
4833 if (rdev0->preferred_minor != unit) {
4834 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4835 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4836 break;
4837 }
4838
4839 md_probe(dev, NULL, NULL);
4840 mddev = mddev_find(dev);
4841 if (!mddev || !mddev->gendisk) {
4842 if (mddev)
4843 mddev_put(mddev);
4844 printk(KERN_ERR
4845 "md: cannot allocate memory for md drive.\n");
4846 break;
4847 }
4848 if (mddev_lock(mddev))
4849 printk(KERN_WARNING "md: %s locked, cannot run\n",
4850 mdname(mddev));
4851 else if (mddev->raid_disks || mddev->major_version
4852 || !list_empty(&mddev->disks)) {
4853 printk(KERN_WARNING
4854 "md: %s already running, cannot run %s\n",
4855 mdname(mddev), bdevname(rdev0->bdev,b));
4856 mddev_unlock(mddev);
4857 } else {
4858 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4859 mddev->persistent = 1;
4860 rdev_for_each_list(rdev, tmp, &candidates) {
4861 list_del_init(&rdev->same_set);
4862 if (bind_rdev_to_array(rdev, mddev))
4863 export_rdev(rdev);
4864 }
4865 autorun_array(mddev);
4866 mddev_unlock(mddev);
4867 }
4868 /* on success, candidates will be empty, on error
4869 * it won't...
4870 */
4871 rdev_for_each_list(rdev, tmp, &candidates) {
4872 list_del_init(&rdev->same_set);
4873 export_rdev(rdev);
4874 }
4875 mddev_put(mddev);
4876 }
4877 printk(KERN_INFO "md: ... autorun DONE.\n");
4878 }
4879 #endif /* !MODULE */
4880
4881 static int get_version(void __user * arg)
4882 {
4883 mdu_version_t ver;
4884
4885 ver.major = MD_MAJOR_VERSION;
4886 ver.minor = MD_MINOR_VERSION;
4887 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4888
4889 if (copy_to_user(arg, &ver, sizeof(ver)))
4890 return -EFAULT;
4891
4892 return 0;
4893 }
4894
4895 static int get_array_info(mddev_t * mddev, void __user * arg)
4896 {
4897 mdu_array_info_t info;
4898 int nr,working,insync,failed,spare;
4899 mdk_rdev_t *rdev;
4900
4901 nr=working=insync=failed=spare=0;
4902 list_for_each_entry(rdev, &mddev->disks, same_set) {
4903 nr++;
4904 if (test_bit(Faulty, &rdev->flags))
4905 failed++;
4906 else {
4907 working++;
4908 if (test_bit(In_sync, &rdev->flags))
4909 insync++;
4910 else
4911 spare++;
4912 }
4913 }
4914
4915 info.major_version = mddev->major_version;
4916 info.minor_version = mddev->minor_version;
4917 info.patch_version = MD_PATCHLEVEL_VERSION;
4918 info.ctime = mddev->ctime;
4919 info.level = mddev->level;
4920 info.size = mddev->dev_sectors / 2;
4921 if (info.size != mddev->dev_sectors / 2) /* overflow */
4922 info.size = -1;
4923 info.nr_disks = nr;
4924 info.raid_disks = mddev->raid_disks;
4925 info.md_minor = mddev->md_minor;
4926 info.not_persistent= !mddev->persistent;
4927
4928 info.utime = mddev->utime;
4929 info.state = 0;
4930 if (mddev->in_sync)
4931 info.state = (1<<MD_SB_CLEAN);
4932 if (mddev->bitmap && mddev->bitmap_info.offset)
4933 info.state = (1<<MD_SB_BITMAP_PRESENT);
4934 info.active_disks = insync;
4935 info.working_disks = working;
4936 info.failed_disks = failed;
4937 info.spare_disks = spare;
4938
4939 info.layout = mddev->layout;
4940 info.chunk_size = mddev->chunk_sectors << 9;
4941
4942 if (copy_to_user(arg, &info, sizeof(info)))
4943 return -EFAULT;
4944
4945 return 0;
4946 }
4947
4948 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4949 {
4950 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4951 char *ptr, *buf = NULL;
4952 int err = -ENOMEM;
4953
4954 if (md_allow_write(mddev))
4955 file = kmalloc(sizeof(*file), GFP_NOIO);
4956 else
4957 file = kmalloc(sizeof(*file), GFP_KERNEL);
4958
4959 if (!file)
4960 goto out;
4961
4962 /* bitmap disabled, zero the first byte and copy out */
4963 if (!mddev->bitmap || !mddev->bitmap->file) {
4964 file->pathname[0] = '\0';
4965 goto copy_out;
4966 }
4967
4968 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4969 if (!buf)
4970 goto out;
4971
4972 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4973 if (IS_ERR(ptr))
4974 goto out;
4975
4976 strcpy(file->pathname, ptr);
4977
4978 copy_out:
4979 err = 0;
4980 if (copy_to_user(arg, file, sizeof(*file)))
4981 err = -EFAULT;
4982 out:
4983 kfree(buf);
4984 kfree(file);
4985 return err;
4986 }
4987
4988 static int get_disk_info(mddev_t * mddev, void __user * arg)
4989 {
4990 mdu_disk_info_t info;
4991 mdk_rdev_t *rdev;
4992
4993 if (copy_from_user(&info, arg, sizeof(info)))
4994 return -EFAULT;
4995
4996 rdev = find_rdev_nr(mddev, info.number);
4997 if (rdev) {
4998 info.major = MAJOR(rdev->bdev->bd_dev);
4999 info.minor = MINOR(rdev->bdev->bd_dev);
5000 info.raid_disk = rdev->raid_disk;
5001 info.state = 0;
5002 if (test_bit(Faulty, &rdev->flags))
5003 info.state |= (1<<MD_DISK_FAULTY);
5004 else if (test_bit(In_sync, &rdev->flags)) {
5005 info.state |= (1<<MD_DISK_ACTIVE);
5006 info.state |= (1<<MD_DISK_SYNC);
5007 }
5008 if (test_bit(WriteMostly, &rdev->flags))
5009 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5010 } else {
5011 info.major = info.minor = 0;
5012 info.raid_disk = -1;
5013 info.state = (1<<MD_DISK_REMOVED);
5014 }
5015
5016 if (copy_to_user(arg, &info, sizeof(info)))
5017 return -EFAULT;
5018
5019 return 0;
5020 }
5021
5022 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
5023 {
5024 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5025 mdk_rdev_t *rdev;
5026 dev_t dev = MKDEV(info->major,info->minor);
5027
5028 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5029 return -EOVERFLOW;
5030
5031 if (!mddev->raid_disks) {
5032 int err;
5033 /* expecting a device which has a superblock */
5034 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5035 if (IS_ERR(rdev)) {
5036 printk(KERN_WARNING
5037 "md: md_import_device returned %ld\n",
5038 PTR_ERR(rdev));
5039 return PTR_ERR(rdev);
5040 }
5041 if (!list_empty(&mddev->disks)) {
5042 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
5043 mdk_rdev_t, same_set);
5044 err = super_types[mddev->major_version]
5045 .load_super(rdev, rdev0, mddev->minor_version);
5046 if (err < 0) {
5047 printk(KERN_WARNING
5048 "md: %s has different UUID to %s\n",
5049 bdevname(rdev->bdev,b),
5050 bdevname(rdev0->bdev,b2));
5051 export_rdev(rdev);
5052 return -EINVAL;
5053 }
5054 }
5055 err = bind_rdev_to_array(rdev, mddev);
5056 if (err)
5057 export_rdev(rdev);
5058 return err;
5059 }
5060
5061 /*
5062 * add_new_disk can be used once the array is assembled
5063 * to add "hot spares". They must already have a superblock
5064 * written
5065 */
5066 if (mddev->pers) {
5067 int err;
5068 if (!mddev->pers->hot_add_disk) {
5069 printk(KERN_WARNING
5070 "%s: personality does not support diskops!\n",
5071 mdname(mddev));
5072 return -EINVAL;
5073 }
5074 if (mddev->persistent)
5075 rdev = md_import_device(dev, mddev->major_version,
5076 mddev->minor_version);
5077 else
5078 rdev = md_import_device(dev, -1, -1);
5079 if (IS_ERR(rdev)) {
5080 printk(KERN_WARNING
5081 "md: md_import_device returned %ld\n",
5082 PTR_ERR(rdev));
5083 return PTR_ERR(rdev);
5084 }
5085 /* set save_raid_disk if appropriate */
5086 if (!mddev->persistent) {
5087 if (info->state & (1<<MD_DISK_SYNC) &&
5088 info->raid_disk < mddev->raid_disks)
5089 rdev->raid_disk = info->raid_disk;
5090 else
5091 rdev->raid_disk = -1;
5092 } else
5093 super_types[mddev->major_version].
5094 validate_super(mddev, rdev);
5095 rdev->saved_raid_disk = rdev->raid_disk;
5096
5097 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5098 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5099 set_bit(WriteMostly, &rdev->flags);
5100 else
5101 clear_bit(WriteMostly, &rdev->flags);
5102
5103 rdev->raid_disk = -1;
5104 err = bind_rdev_to_array(rdev, mddev);
5105 if (!err && !mddev->pers->hot_remove_disk) {
5106 /* If there is hot_add_disk but no hot_remove_disk
5107 * then added disks for geometry changes,
5108 * and should be added immediately.
5109 */
5110 super_types[mddev->major_version].
5111 validate_super(mddev, rdev);
5112 err = mddev->pers->hot_add_disk(mddev, rdev);
5113 if (err)
5114 unbind_rdev_from_array(rdev);
5115 }
5116 if (err)
5117 export_rdev(rdev);
5118 else
5119 sysfs_notify_dirent_safe(rdev->sysfs_state);
5120
5121 md_update_sb(mddev, 1);
5122 if (mddev->degraded)
5123 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5124 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5125 md_wakeup_thread(mddev->thread);
5126 return err;
5127 }
5128
5129 /* otherwise, add_new_disk is only allowed
5130 * for major_version==0 superblocks
5131 */
5132 if (mddev->major_version != 0) {
5133 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5134 mdname(mddev));
5135 return -EINVAL;
5136 }
5137
5138 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5139 int err;
5140 rdev = md_import_device(dev, -1, 0);
5141 if (IS_ERR(rdev)) {
5142 printk(KERN_WARNING
5143 "md: error, md_import_device() returned %ld\n",
5144 PTR_ERR(rdev));
5145 return PTR_ERR(rdev);
5146 }
5147 rdev->desc_nr = info->number;
5148 if (info->raid_disk < mddev->raid_disks)
5149 rdev->raid_disk = info->raid_disk;
5150 else
5151 rdev->raid_disk = -1;
5152
5153 if (rdev->raid_disk < mddev->raid_disks)
5154 if (info->state & (1<<MD_DISK_SYNC))
5155 set_bit(In_sync, &rdev->flags);
5156
5157 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5158 set_bit(WriteMostly, &rdev->flags);
5159
5160 if (!mddev->persistent) {
5161 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5162 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
5163 } else
5164 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
5165 rdev->sectors = rdev->sb_start;
5166
5167 err = bind_rdev_to_array(rdev, mddev);
5168 if (err) {
5169 export_rdev(rdev);
5170 return err;
5171 }
5172 }
5173
5174 return 0;
5175 }
5176
5177 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
5178 {
5179 char b[BDEVNAME_SIZE];
5180 mdk_rdev_t *rdev;
5181
5182 rdev = find_rdev(mddev, dev);
5183 if (!rdev)
5184 return -ENXIO;
5185
5186 if (rdev->raid_disk >= 0)
5187 goto busy;
5188
5189 kick_rdev_from_array(rdev);
5190 md_update_sb(mddev, 1);
5191 md_new_event(mddev);
5192
5193 return 0;
5194 busy:
5195 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5196 bdevname(rdev->bdev,b), mdname(mddev));
5197 return -EBUSY;
5198 }
5199
5200 static int hot_add_disk(mddev_t * mddev, dev_t dev)
5201 {
5202 char b[BDEVNAME_SIZE];
5203 int err;
5204 mdk_rdev_t *rdev;
5205
5206 if (!mddev->pers)
5207 return -ENODEV;
5208
5209 if (mddev->major_version != 0) {
5210 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5211 " version-0 superblocks.\n",
5212 mdname(mddev));
5213 return -EINVAL;
5214 }
5215 if (!mddev->pers->hot_add_disk) {
5216 printk(KERN_WARNING
5217 "%s: personality does not support diskops!\n",
5218 mdname(mddev));
5219 return -EINVAL;
5220 }
5221
5222 rdev = md_import_device(dev, -1, 0);
5223 if (IS_ERR(rdev)) {
5224 printk(KERN_WARNING
5225 "md: error, md_import_device() returned %ld\n",
5226 PTR_ERR(rdev));
5227 return -EINVAL;
5228 }
5229
5230 if (mddev->persistent)
5231 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
5232 else
5233 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
5234
5235 rdev->sectors = rdev->sb_start;
5236
5237 if (test_bit(Faulty, &rdev->flags)) {
5238 printk(KERN_WARNING
5239 "md: can not hot-add faulty %s disk to %s!\n",
5240 bdevname(rdev->bdev,b), mdname(mddev));
5241 err = -EINVAL;
5242 goto abort_export;
5243 }
5244 clear_bit(In_sync, &rdev->flags);
5245 rdev->desc_nr = -1;
5246 rdev->saved_raid_disk = -1;
5247 err = bind_rdev_to_array(rdev, mddev);
5248 if (err)
5249 goto abort_export;
5250
5251 /*
5252 * The rest should better be atomic, we can have disk failures
5253 * noticed in interrupt contexts ...
5254 */
5255
5256 rdev->raid_disk = -1;
5257
5258 md_update_sb(mddev, 1);
5259
5260 /*
5261 * Kick recovery, maybe this spare has to be added to the
5262 * array immediately.
5263 */
5264 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5265 md_wakeup_thread(mddev->thread);
5266 md_new_event(mddev);
5267 return 0;
5268
5269 abort_export:
5270 export_rdev(rdev);
5271 return err;
5272 }
5273
5274 static int set_bitmap_file(mddev_t *mddev, int fd)
5275 {
5276 int err;
5277
5278 if (mddev->pers) {
5279 if (!mddev->pers->quiesce)
5280 return -EBUSY;
5281 if (mddev->recovery || mddev->sync_thread)
5282 return -EBUSY;
5283 /* we should be able to change the bitmap.. */
5284 }
5285
5286
5287 if (fd >= 0) {
5288 if (mddev->bitmap)
5289 return -EEXIST; /* cannot add when bitmap is present */
5290 mddev->bitmap_info.file = fget(fd);
5291
5292 if (mddev->bitmap_info.file == NULL) {
5293 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5294 mdname(mddev));
5295 return -EBADF;
5296 }
5297
5298 err = deny_bitmap_write_access(mddev->bitmap_info.file);
5299 if (err) {
5300 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5301 mdname(mddev));
5302 fput(mddev->bitmap_info.file);
5303 mddev->bitmap_info.file = NULL;
5304 return err;
5305 }
5306 mddev->bitmap_info.offset = 0; /* file overrides offset */
5307 } else if (mddev->bitmap == NULL)
5308 return -ENOENT; /* cannot remove what isn't there */
5309 err = 0;
5310 if (mddev->pers) {
5311 mddev->pers->quiesce(mddev, 1);
5312 if (fd >= 0) {
5313 err = bitmap_create(mddev);
5314 if (!err)
5315 err = bitmap_load(mddev);
5316 }
5317 if (fd < 0 || err) {
5318 bitmap_destroy(mddev);
5319 fd = -1; /* make sure to put the file */
5320 }
5321 mddev->pers->quiesce(mddev, 0);
5322 }
5323 if (fd < 0) {
5324 if (mddev->bitmap_info.file) {
5325 restore_bitmap_write_access(mddev->bitmap_info.file);
5326 fput(mddev->bitmap_info.file);
5327 }
5328 mddev->bitmap_info.file = NULL;
5329 }
5330
5331 return err;
5332 }
5333
5334 /*
5335 * set_array_info is used two different ways
5336 * The original usage is when creating a new array.
5337 * In this usage, raid_disks is > 0 and it together with
5338 * level, size, not_persistent,layout,chunksize determine the
5339 * shape of the array.
5340 * This will always create an array with a type-0.90.0 superblock.
5341 * The newer usage is when assembling an array.
5342 * In this case raid_disks will be 0, and the major_version field is
5343 * use to determine which style super-blocks are to be found on the devices.
5344 * The minor and patch _version numbers are also kept incase the
5345 * super_block handler wishes to interpret them.
5346 */
5347 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5348 {
5349
5350 if (info->raid_disks == 0) {
5351 /* just setting version number for superblock loading */
5352 if (info->major_version < 0 ||
5353 info->major_version >= ARRAY_SIZE(super_types) ||
5354 super_types[info->major_version].name == NULL) {
5355 /* maybe try to auto-load a module? */
5356 printk(KERN_INFO
5357 "md: superblock version %d not known\n",
5358 info->major_version);
5359 return -EINVAL;
5360 }
5361 mddev->major_version = info->major_version;
5362 mddev->minor_version = info->minor_version;
5363 mddev->patch_version = info->patch_version;
5364 mddev->persistent = !info->not_persistent;
5365 /* ensure mddev_put doesn't delete this now that there
5366 * is some minimal configuration.
5367 */
5368 mddev->ctime = get_seconds();
5369 return 0;
5370 }
5371 mddev->major_version = MD_MAJOR_VERSION;
5372 mddev->minor_version = MD_MINOR_VERSION;
5373 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5374 mddev->ctime = get_seconds();
5375
5376 mddev->level = info->level;
5377 mddev->clevel[0] = 0;
5378 mddev->dev_sectors = 2 * (sector_t)info->size;
5379 mddev->raid_disks = info->raid_disks;
5380 /* don't set md_minor, it is determined by which /dev/md* was
5381 * openned
5382 */
5383 if (info->state & (1<<MD_SB_CLEAN))
5384 mddev->recovery_cp = MaxSector;
5385 else
5386 mddev->recovery_cp = 0;
5387 mddev->persistent = ! info->not_persistent;
5388 mddev->external = 0;
5389
5390 mddev->layout = info->layout;
5391 mddev->chunk_sectors = info->chunk_size >> 9;
5392
5393 mddev->max_disks = MD_SB_DISKS;
5394
5395 if (mddev->persistent)
5396 mddev->flags = 0;
5397 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5398
5399 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
5400 mddev->bitmap_info.offset = 0;
5401
5402 mddev->reshape_position = MaxSector;
5403
5404 /*
5405 * Generate a 128 bit UUID
5406 */
5407 get_random_bytes(mddev->uuid, 16);
5408
5409 mddev->new_level = mddev->level;
5410 mddev->new_chunk_sectors = mddev->chunk_sectors;
5411 mddev->new_layout = mddev->layout;
5412 mddev->delta_disks = 0;
5413
5414 return 0;
5415 }
5416
5417 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5418 {
5419 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5420
5421 if (mddev->external_size)
5422 return;
5423
5424 mddev->array_sectors = array_sectors;
5425 }
5426 EXPORT_SYMBOL(md_set_array_sectors);
5427
5428 static int update_size(mddev_t *mddev, sector_t num_sectors)
5429 {
5430 mdk_rdev_t *rdev;
5431 int rv;
5432 int fit = (num_sectors == 0);
5433
5434 if (mddev->pers->resize == NULL)
5435 return -EINVAL;
5436 /* The "num_sectors" is the number of sectors of each device that
5437 * is used. This can only make sense for arrays with redundancy.
5438 * linear and raid0 always use whatever space is available. We can only
5439 * consider changing this number if no resync or reconstruction is
5440 * happening, and if the new size is acceptable. It must fit before the
5441 * sb_start or, if that is <data_offset, it must fit before the size
5442 * of each device. If num_sectors is zero, we find the largest size
5443 * that fits.
5444
5445 */
5446 if (mddev->sync_thread)
5447 return -EBUSY;
5448 if (mddev->bitmap)
5449 /* Sorry, cannot grow a bitmap yet, just remove it,
5450 * grow, and re-add.
5451 */
5452 return -EBUSY;
5453 list_for_each_entry(rdev, &mddev->disks, same_set) {
5454 sector_t avail = rdev->sectors;
5455
5456 if (fit && (num_sectors == 0 || num_sectors > avail))
5457 num_sectors = avail;
5458 if (avail < num_sectors)
5459 return -ENOSPC;
5460 }
5461 rv = mddev->pers->resize(mddev, num_sectors);
5462 if (!rv)
5463 revalidate_disk(mddev->gendisk);
5464 return rv;
5465 }
5466
5467 static int update_raid_disks(mddev_t *mddev, int raid_disks)
5468 {
5469 int rv;
5470 /* change the number of raid disks */
5471 if (mddev->pers->check_reshape == NULL)
5472 return -EINVAL;
5473 if (raid_disks <= 0 ||
5474 (mddev->max_disks && raid_disks >= mddev->max_disks))
5475 return -EINVAL;
5476 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5477 return -EBUSY;
5478 mddev->delta_disks = raid_disks - mddev->raid_disks;
5479
5480 rv = mddev->pers->check_reshape(mddev);
5481 return rv;
5482 }
5483
5484
5485 /*
5486 * update_array_info is used to change the configuration of an
5487 * on-line array.
5488 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5489 * fields in the info are checked against the array.
5490 * Any differences that cannot be handled will cause an error.
5491 * Normally, only one change can be managed at a time.
5492 */
5493 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5494 {
5495 int rv = 0;
5496 int cnt = 0;
5497 int state = 0;
5498
5499 /* calculate expected state,ignoring low bits */
5500 if (mddev->bitmap && mddev->bitmap_info.offset)
5501 state |= (1 << MD_SB_BITMAP_PRESENT);
5502
5503 if (mddev->major_version != info->major_version ||
5504 mddev->minor_version != info->minor_version ||
5505 /* mddev->patch_version != info->patch_version || */
5506 mddev->ctime != info->ctime ||
5507 mddev->level != info->level ||
5508 /* mddev->layout != info->layout || */
5509 !mddev->persistent != info->not_persistent||
5510 mddev->chunk_sectors != info->chunk_size >> 9 ||
5511 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5512 ((state^info->state) & 0xfffffe00)
5513 )
5514 return -EINVAL;
5515 /* Check there is only one change */
5516 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5517 cnt++;
5518 if (mddev->raid_disks != info->raid_disks)
5519 cnt++;
5520 if (mddev->layout != info->layout)
5521 cnt++;
5522 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5523 cnt++;
5524 if (cnt == 0)
5525 return 0;
5526 if (cnt > 1)
5527 return -EINVAL;
5528
5529 if (mddev->layout != info->layout) {
5530 /* Change layout
5531 * we don't need to do anything at the md level, the
5532 * personality will take care of it all.
5533 */
5534 if (mddev->pers->check_reshape == NULL)
5535 return -EINVAL;
5536 else {
5537 mddev->new_layout = info->layout;
5538 rv = mddev->pers->check_reshape(mddev);
5539 if (rv)
5540 mddev->new_layout = mddev->layout;
5541 return rv;
5542 }
5543 }
5544 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5545 rv = update_size(mddev, (sector_t)info->size * 2);
5546
5547 if (mddev->raid_disks != info->raid_disks)
5548 rv = update_raid_disks(mddev, info->raid_disks);
5549
5550 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5551 if (mddev->pers->quiesce == NULL)
5552 return -EINVAL;
5553 if (mddev->recovery || mddev->sync_thread)
5554 return -EBUSY;
5555 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5556 /* add the bitmap */
5557 if (mddev->bitmap)
5558 return -EEXIST;
5559 if (mddev->bitmap_info.default_offset == 0)
5560 return -EINVAL;
5561 mddev->bitmap_info.offset =
5562 mddev->bitmap_info.default_offset;
5563 mddev->pers->quiesce(mddev, 1);
5564 rv = bitmap_create(mddev);
5565 if (!rv)
5566 rv = bitmap_load(mddev);
5567 if (rv)
5568 bitmap_destroy(mddev);
5569 mddev->pers->quiesce(mddev, 0);
5570 } else {
5571 /* remove the bitmap */
5572 if (!mddev->bitmap)
5573 return -ENOENT;
5574 if (mddev->bitmap->file)
5575 return -EINVAL;
5576 mddev->pers->quiesce(mddev, 1);
5577 bitmap_destroy(mddev);
5578 mddev->pers->quiesce(mddev, 0);
5579 mddev->bitmap_info.offset = 0;
5580 }
5581 }
5582 md_update_sb(mddev, 1);
5583 return rv;
5584 }
5585
5586 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5587 {
5588 mdk_rdev_t *rdev;
5589
5590 if (mddev->pers == NULL)
5591 return -ENODEV;
5592
5593 rdev = find_rdev(mddev, dev);
5594 if (!rdev)
5595 return -ENODEV;
5596
5597 md_error(mddev, rdev);
5598 return 0;
5599 }
5600
5601 /*
5602 * We have a problem here : there is no easy way to give a CHS
5603 * virtual geometry. We currently pretend that we have a 2 heads
5604 * 4 sectors (with a BIG number of cylinders...). This drives
5605 * dosfs just mad... ;-)
5606 */
5607 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5608 {
5609 mddev_t *mddev = bdev->bd_disk->private_data;
5610
5611 geo->heads = 2;
5612 geo->sectors = 4;
5613 geo->cylinders = mddev->array_sectors / 8;
5614 return 0;
5615 }
5616
5617 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5618 unsigned int cmd, unsigned long arg)
5619 {
5620 int err = 0;
5621 void __user *argp = (void __user *)arg;
5622 mddev_t *mddev = NULL;
5623 int ro;
5624
5625 if (!capable(CAP_SYS_ADMIN))
5626 return -EACCES;
5627
5628 /*
5629 * Commands dealing with the RAID driver but not any
5630 * particular array:
5631 */
5632 switch (cmd)
5633 {
5634 case RAID_VERSION:
5635 err = get_version(argp);
5636 goto done;
5637
5638 case PRINT_RAID_DEBUG:
5639 err = 0;
5640 md_print_devices();
5641 goto done;
5642
5643 #ifndef MODULE
5644 case RAID_AUTORUN:
5645 err = 0;
5646 autostart_arrays(arg);
5647 goto done;
5648 #endif
5649 default:;
5650 }
5651
5652 /*
5653 * Commands creating/starting a new array:
5654 */
5655
5656 mddev = bdev->bd_disk->private_data;
5657
5658 if (!mddev) {
5659 BUG();
5660 goto abort;
5661 }
5662
5663 err = mddev_lock(mddev);
5664 if (err) {
5665 printk(KERN_INFO
5666 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5667 err, cmd);
5668 goto abort;
5669 }
5670
5671 switch (cmd)
5672 {
5673 case SET_ARRAY_INFO:
5674 {
5675 mdu_array_info_t info;
5676 if (!arg)
5677 memset(&info, 0, sizeof(info));
5678 else if (copy_from_user(&info, argp, sizeof(info))) {
5679 err = -EFAULT;
5680 goto abort_unlock;
5681 }
5682 if (mddev->pers) {
5683 err = update_array_info(mddev, &info);
5684 if (err) {
5685 printk(KERN_WARNING "md: couldn't update"
5686 " array info. %d\n", err);
5687 goto abort_unlock;
5688 }
5689 goto done_unlock;
5690 }
5691 if (!list_empty(&mddev->disks)) {
5692 printk(KERN_WARNING
5693 "md: array %s already has disks!\n",
5694 mdname(mddev));
5695 err = -EBUSY;
5696 goto abort_unlock;
5697 }
5698 if (mddev->raid_disks) {
5699 printk(KERN_WARNING
5700 "md: array %s already initialised!\n",
5701 mdname(mddev));
5702 err = -EBUSY;
5703 goto abort_unlock;
5704 }
5705 err = set_array_info(mddev, &info);
5706 if (err) {
5707 printk(KERN_WARNING "md: couldn't set"
5708 " array info. %d\n", err);
5709 goto abort_unlock;
5710 }
5711 }
5712 goto done_unlock;
5713
5714 default:;
5715 }
5716
5717 /*
5718 * Commands querying/configuring an existing array:
5719 */
5720 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5721 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5722 if ((!mddev->raid_disks && !mddev->external)
5723 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5724 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5725 && cmd != GET_BITMAP_FILE) {
5726 err = -ENODEV;
5727 goto abort_unlock;
5728 }
5729
5730 /*
5731 * Commands even a read-only array can execute:
5732 */
5733 switch (cmd)
5734 {
5735 case GET_ARRAY_INFO:
5736 err = get_array_info(mddev, argp);
5737 goto done_unlock;
5738
5739 case GET_BITMAP_FILE:
5740 err = get_bitmap_file(mddev, argp);
5741 goto done_unlock;
5742
5743 case GET_DISK_INFO:
5744 err = get_disk_info(mddev, argp);
5745 goto done_unlock;
5746
5747 case RESTART_ARRAY_RW:
5748 err = restart_array(mddev);
5749 goto done_unlock;
5750
5751 case STOP_ARRAY:
5752 err = do_md_stop(mddev, 0, 1);
5753 goto done_unlock;
5754
5755 case STOP_ARRAY_RO:
5756 err = md_set_readonly(mddev, 1);
5757 goto done_unlock;
5758
5759 case BLKROSET:
5760 if (get_user(ro, (int __user *)(arg))) {
5761 err = -EFAULT;
5762 goto done_unlock;
5763 }
5764 err = -EINVAL;
5765
5766 /* if the bdev is going readonly the value of mddev->ro
5767 * does not matter, no writes are coming
5768 */
5769 if (ro)
5770 goto done_unlock;
5771
5772 /* are we are already prepared for writes? */
5773 if (mddev->ro != 1)
5774 goto done_unlock;
5775
5776 /* transitioning to readauto need only happen for
5777 * arrays that call md_write_start
5778 */
5779 if (mddev->pers) {
5780 err = restart_array(mddev);
5781 if (err == 0) {
5782 mddev->ro = 2;
5783 set_disk_ro(mddev->gendisk, 0);
5784 }
5785 }
5786 goto done_unlock;
5787 }
5788
5789 /*
5790 * The remaining ioctls are changing the state of the
5791 * superblock, so we do not allow them on read-only arrays.
5792 * However non-MD ioctls (e.g. get-size) will still come through
5793 * here and hit the 'default' below, so only disallow
5794 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5795 */
5796 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5797 if (mddev->ro == 2) {
5798 mddev->ro = 0;
5799 sysfs_notify_dirent_safe(mddev->sysfs_state);
5800 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5801 md_wakeup_thread(mddev->thread);
5802 } else {
5803 err = -EROFS;
5804 goto abort_unlock;
5805 }
5806 }
5807
5808 switch (cmd)
5809 {
5810 case ADD_NEW_DISK:
5811 {
5812 mdu_disk_info_t info;
5813 if (copy_from_user(&info, argp, sizeof(info)))
5814 err = -EFAULT;
5815 else
5816 err = add_new_disk(mddev, &info);
5817 goto done_unlock;
5818 }
5819
5820 case HOT_REMOVE_DISK:
5821 err = hot_remove_disk(mddev, new_decode_dev(arg));
5822 goto done_unlock;
5823
5824 case HOT_ADD_DISK:
5825 err = hot_add_disk(mddev, new_decode_dev(arg));
5826 goto done_unlock;
5827
5828 case SET_DISK_FAULTY:
5829 err = set_disk_faulty(mddev, new_decode_dev(arg));
5830 goto done_unlock;
5831
5832 case RUN_ARRAY:
5833 err = do_md_run(mddev);
5834 goto done_unlock;
5835
5836 case SET_BITMAP_FILE:
5837 err = set_bitmap_file(mddev, (int)arg);
5838 goto done_unlock;
5839
5840 default:
5841 err = -EINVAL;
5842 goto abort_unlock;
5843 }
5844
5845 done_unlock:
5846 abort_unlock:
5847 if (mddev->hold_active == UNTIL_IOCTL &&
5848 err != -EINVAL)
5849 mddev->hold_active = 0;
5850 mddev_unlock(mddev);
5851
5852 return err;
5853 done:
5854 if (err)
5855 MD_BUG();
5856 abort:
5857 return err;
5858 }
5859 #ifdef CONFIG_COMPAT
5860 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
5861 unsigned int cmd, unsigned long arg)
5862 {
5863 switch (cmd) {
5864 case HOT_REMOVE_DISK:
5865 case HOT_ADD_DISK:
5866 case SET_DISK_FAULTY:
5867 case SET_BITMAP_FILE:
5868 /* These take in integer arg, do not convert */
5869 break;
5870 default:
5871 arg = (unsigned long)compat_ptr(arg);
5872 break;
5873 }
5874
5875 return md_ioctl(bdev, mode, cmd, arg);
5876 }
5877 #endif /* CONFIG_COMPAT */
5878
5879 static int md_open(struct block_device *bdev, fmode_t mode)
5880 {
5881 /*
5882 * Succeed if we can lock the mddev, which confirms that
5883 * it isn't being stopped right now.
5884 */
5885 mddev_t *mddev = mddev_find(bdev->bd_dev);
5886 int err;
5887
5888 mutex_lock(&md_mutex);
5889 if (mddev->gendisk != bdev->bd_disk) {
5890 /* we are racing with mddev_put which is discarding this
5891 * bd_disk.
5892 */
5893 mddev_put(mddev);
5894 /* Wait until bdev->bd_disk is definitely gone */
5895 flush_scheduled_work();
5896 /* Then retry the open from the top */
5897 mutex_unlock(&md_mutex);
5898 return -ERESTARTSYS;
5899 }
5900 BUG_ON(mddev != bdev->bd_disk->private_data);
5901
5902 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
5903 goto out;
5904
5905 err = 0;
5906 atomic_inc(&mddev->openers);
5907 mutex_unlock(&mddev->open_mutex);
5908
5909 check_disk_size_change(mddev->gendisk, bdev);
5910 out:
5911 mutex_unlock(&md_mutex);
5912 return err;
5913 }
5914
5915 static int md_release(struct gendisk *disk, fmode_t mode)
5916 {
5917 mddev_t *mddev = disk->private_data;
5918
5919 BUG_ON(!mddev);
5920 mutex_lock(&md_mutex);
5921 atomic_dec(&mddev->openers);
5922 mddev_put(mddev);
5923 mutex_unlock(&md_mutex);
5924
5925 return 0;
5926 }
5927 static const struct block_device_operations md_fops =
5928 {
5929 .owner = THIS_MODULE,
5930 .open = md_open,
5931 .release = md_release,
5932 .ioctl = md_ioctl,
5933 #ifdef CONFIG_COMPAT
5934 .compat_ioctl = md_compat_ioctl,
5935 #endif
5936 .getgeo = md_getgeo,
5937 };
5938
5939 static int md_thread(void * arg)
5940 {
5941 mdk_thread_t *thread = arg;
5942
5943 /*
5944 * md_thread is a 'system-thread', it's priority should be very
5945 * high. We avoid resource deadlocks individually in each
5946 * raid personality. (RAID5 does preallocation) We also use RR and
5947 * the very same RT priority as kswapd, thus we will never get
5948 * into a priority inversion deadlock.
5949 *
5950 * we definitely have to have equal or higher priority than
5951 * bdflush, otherwise bdflush will deadlock if there are too
5952 * many dirty RAID5 blocks.
5953 */
5954
5955 allow_signal(SIGKILL);
5956 while (!kthread_should_stop()) {
5957
5958 /* We need to wait INTERRUPTIBLE so that
5959 * we don't add to the load-average.
5960 * That means we need to be sure no signals are
5961 * pending
5962 */
5963 if (signal_pending(current))
5964 flush_signals(current);
5965
5966 wait_event_interruptible_timeout
5967 (thread->wqueue,
5968 test_bit(THREAD_WAKEUP, &thread->flags)
5969 || kthread_should_stop(),
5970 thread->timeout);
5971
5972 clear_bit(THREAD_WAKEUP, &thread->flags);
5973
5974 thread->run(thread->mddev);
5975 }
5976
5977 return 0;
5978 }
5979
5980 void md_wakeup_thread(mdk_thread_t *thread)
5981 {
5982 if (thread) {
5983 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5984 set_bit(THREAD_WAKEUP, &thread->flags);
5985 wake_up(&thread->wqueue);
5986 }
5987 }
5988
5989 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5990 const char *name)
5991 {
5992 mdk_thread_t *thread;
5993
5994 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5995 if (!thread)
5996 return NULL;
5997
5998 init_waitqueue_head(&thread->wqueue);
5999
6000 thread->run = run;
6001 thread->mddev = mddev;
6002 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6003 thread->tsk = kthread_run(md_thread, thread,
6004 "%s_%s",
6005 mdname(thread->mddev),
6006 name ?: mddev->pers->name);
6007 if (IS_ERR(thread->tsk)) {
6008 kfree(thread);
6009 return NULL;
6010 }
6011 return thread;
6012 }
6013
6014 void md_unregister_thread(mdk_thread_t *thread)
6015 {
6016 if (!thread)
6017 return;
6018 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
6019
6020 kthread_stop(thread->tsk);
6021 kfree(thread);
6022 }
6023
6024 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
6025 {
6026 if (!mddev) {
6027 MD_BUG();
6028 return;
6029 }
6030
6031 if (!rdev || test_bit(Faulty, &rdev->flags))
6032 return;
6033
6034 if (mddev->external)
6035 set_bit(Blocked, &rdev->flags);
6036 /*
6037 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6038 mdname(mddev),
6039 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6040 __builtin_return_address(0),__builtin_return_address(1),
6041 __builtin_return_address(2),__builtin_return_address(3));
6042 */
6043 if (!mddev->pers)
6044 return;
6045 if (!mddev->pers->error_handler)
6046 return;
6047 mddev->pers->error_handler(mddev,rdev);
6048 if (mddev->degraded)
6049 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6050 sysfs_notify_dirent_safe(rdev->sysfs_state);
6051 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6052 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6053 md_wakeup_thread(mddev->thread);
6054 if (mddev->event_work.func)
6055 schedule_work(&mddev->event_work);
6056 md_new_event_inintr(mddev);
6057 }
6058
6059 /* seq_file implementation /proc/mdstat */
6060
6061 static void status_unused(struct seq_file *seq)
6062 {
6063 int i = 0;
6064 mdk_rdev_t *rdev;
6065
6066 seq_printf(seq, "unused devices: ");
6067
6068 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
6069 char b[BDEVNAME_SIZE];
6070 i++;
6071 seq_printf(seq, "%s ",
6072 bdevname(rdev->bdev,b));
6073 }
6074 if (!i)
6075 seq_printf(seq, "<none>");
6076
6077 seq_printf(seq, "\n");
6078 }
6079
6080
6081 static void status_resync(struct seq_file *seq, mddev_t * mddev)
6082 {
6083 sector_t max_sectors, resync, res;
6084 unsigned long dt, db;
6085 sector_t rt;
6086 int scale;
6087 unsigned int per_milli;
6088
6089 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
6090
6091 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6092 max_sectors = mddev->resync_max_sectors;
6093 else
6094 max_sectors = mddev->dev_sectors;
6095
6096 /*
6097 * Should not happen.
6098 */
6099 if (!max_sectors) {
6100 MD_BUG();
6101 return;
6102 }
6103 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6104 * in a sector_t, and (max_sectors>>scale) will fit in a
6105 * u32, as those are the requirements for sector_div.
6106 * Thus 'scale' must be at least 10
6107 */
6108 scale = 10;
6109 if (sizeof(sector_t) > sizeof(unsigned long)) {
6110 while ( max_sectors/2 > (1ULL<<(scale+32)))
6111 scale++;
6112 }
6113 res = (resync>>scale)*1000;
6114 sector_div(res, (u32)((max_sectors>>scale)+1));
6115
6116 per_milli = res;
6117 {
6118 int i, x = per_milli/50, y = 20-x;
6119 seq_printf(seq, "[");
6120 for (i = 0; i < x; i++)
6121 seq_printf(seq, "=");
6122 seq_printf(seq, ">");
6123 for (i = 0; i < y; i++)
6124 seq_printf(seq, ".");
6125 seq_printf(seq, "] ");
6126 }
6127 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6128 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6129 "reshape" :
6130 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6131 "check" :
6132 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6133 "resync" : "recovery"))),
6134 per_milli/10, per_milli % 10,
6135 (unsigned long long) resync/2,
6136 (unsigned long long) max_sectors/2);
6137
6138 /*
6139 * dt: time from mark until now
6140 * db: blocks written from mark until now
6141 * rt: remaining time
6142 *
6143 * rt is a sector_t, so could be 32bit or 64bit.
6144 * So we divide before multiply in case it is 32bit and close
6145 * to the limit.
6146 * We scale the divisor (db) by 32 to avoid loosing precision
6147 * near the end of resync when the number of remaining sectors
6148 * is close to 'db'.
6149 * We then divide rt by 32 after multiplying by db to compensate.
6150 * The '+1' avoids division by zero if db is very small.
6151 */
6152 dt = ((jiffies - mddev->resync_mark) / HZ);
6153 if (!dt) dt++;
6154 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6155 - mddev->resync_mark_cnt;
6156
6157 rt = max_sectors - resync; /* number of remaining sectors */
6158 sector_div(rt, db/32+1);
6159 rt *= dt;
6160 rt >>= 5;
6161
6162 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6163 ((unsigned long)rt % 60)/6);
6164
6165 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6166 }
6167
6168 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6169 {
6170 struct list_head *tmp;
6171 loff_t l = *pos;
6172 mddev_t *mddev;
6173
6174 if (l >= 0x10000)
6175 return NULL;
6176 if (!l--)
6177 /* header */
6178 return (void*)1;
6179
6180 spin_lock(&all_mddevs_lock);
6181 list_for_each(tmp,&all_mddevs)
6182 if (!l--) {
6183 mddev = list_entry(tmp, mddev_t, all_mddevs);
6184 mddev_get(mddev);
6185 spin_unlock(&all_mddevs_lock);
6186 return mddev;
6187 }
6188 spin_unlock(&all_mddevs_lock);
6189 if (!l--)
6190 return (void*)2;/* tail */
6191 return NULL;
6192 }
6193
6194 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6195 {
6196 struct list_head *tmp;
6197 mddev_t *next_mddev, *mddev = v;
6198
6199 ++*pos;
6200 if (v == (void*)2)
6201 return NULL;
6202
6203 spin_lock(&all_mddevs_lock);
6204 if (v == (void*)1)
6205 tmp = all_mddevs.next;
6206 else
6207 tmp = mddev->all_mddevs.next;
6208 if (tmp != &all_mddevs)
6209 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
6210 else {
6211 next_mddev = (void*)2;
6212 *pos = 0x10000;
6213 }
6214 spin_unlock(&all_mddevs_lock);
6215
6216 if (v != (void*)1)
6217 mddev_put(mddev);
6218 return next_mddev;
6219
6220 }
6221
6222 static void md_seq_stop(struct seq_file *seq, void *v)
6223 {
6224 mddev_t *mddev = v;
6225
6226 if (mddev && v != (void*)1 && v != (void*)2)
6227 mddev_put(mddev);
6228 }
6229
6230 struct mdstat_info {
6231 int event;
6232 };
6233
6234 static int md_seq_show(struct seq_file *seq, void *v)
6235 {
6236 mddev_t *mddev = v;
6237 sector_t sectors;
6238 mdk_rdev_t *rdev;
6239 struct mdstat_info *mi = seq->private;
6240 struct bitmap *bitmap;
6241
6242 if (v == (void*)1) {
6243 struct mdk_personality *pers;
6244 seq_printf(seq, "Personalities : ");
6245 spin_lock(&pers_lock);
6246 list_for_each_entry(pers, &pers_list, list)
6247 seq_printf(seq, "[%s] ", pers->name);
6248
6249 spin_unlock(&pers_lock);
6250 seq_printf(seq, "\n");
6251 mi->event = atomic_read(&md_event_count);
6252 return 0;
6253 }
6254 if (v == (void*)2) {
6255 status_unused(seq);
6256 return 0;
6257 }
6258
6259 if (mddev_lock(mddev) < 0)
6260 return -EINTR;
6261
6262 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
6263 seq_printf(seq, "%s : %sactive", mdname(mddev),
6264 mddev->pers ? "" : "in");
6265 if (mddev->pers) {
6266 if (mddev->ro==1)
6267 seq_printf(seq, " (read-only)");
6268 if (mddev->ro==2)
6269 seq_printf(seq, " (auto-read-only)");
6270 seq_printf(seq, " %s", mddev->pers->name);
6271 }
6272
6273 sectors = 0;
6274 list_for_each_entry(rdev, &mddev->disks, same_set) {
6275 char b[BDEVNAME_SIZE];
6276 seq_printf(seq, " %s[%d]",
6277 bdevname(rdev->bdev,b), rdev->desc_nr);
6278 if (test_bit(WriteMostly, &rdev->flags))
6279 seq_printf(seq, "(W)");
6280 if (test_bit(Faulty, &rdev->flags)) {
6281 seq_printf(seq, "(F)");
6282 continue;
6283 } else if (rdev->raid_disk < 0)
6284 seq_printf(seq, "(S)"); /* spare */
6285 sectors += rdev->sectors;
6286 }
6287
6288 if (!list_empty(&mddev->disks)) {
6289 if (mddev->pers)
6290 seq_printf(seq, "\n %llu blocks",
6291 (unsigned long long)
6292 mddev->array_sectors / 2);
6293 else
6294 seq_printf(seq, "\n %llu blocks",
6295 (unsigned long long)sectors / 2);
6296 }
6297 if (mddev->persistent) {
6298 if (mddev->major_version != 0 ||
6299 mddev->minor_version != 90) {
6300 seq_printf(seq," super %d.%d",
6301 mddev->major_version,
6302 mddev->minor_version);
6303 }
6304 } else if (mddev->external)
6305 seq_printf(seq, " super external:%s",
6306 mddev->metadata_type);
6307 else
6308 seq_printf(seq, " super non-persistent");
6309
6310 if (mddev->pers) {
6311 mddev->pers->status(seq, mddev);
6312 seq_printf(seq, "\n ");
6313 if (mddev->pers->sync_request) {
6314 if (mddev->curr_resync > 2) {
6315 status_resync(seq, mddev);
6316 seq_printf(seq, "\n ");
6317 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
6318 seq_printf(seq, "\tresync=DELAYED\n ");
6319 else if (mddev->recovery_cp < MaxSector)
6320 seq_printf(seq, "\tresync=PENDING\n ");
6321 }
6322 } else
6323 seq_printf(seq, "\n ");
6324
6325 if ((bitmap = mddev->bitmap)) {
6326 unsigned long chunk_kb;
6327 unsigned long flags;
6328 spin_lock_irqsave(&bitmap->lock, flags);
6329 chunk_kb = mddev->bitmap_info.chunksize >> 10;
6330 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
6331 "%lu%s chunk",
6332 bitmap->pages - bitmap->missing_pages,
6333 bitmap->pages,
6334 (bitmap->pages - bitmap->missing_pages)
6335 << (PAGE_SHIFT - 10),
6336 chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize,
6337 chunk_kb ? "KB" : "B");
6338 if (bitmap->file) {
6339 seq_printf(seq, ", file: ");
6340 seq_path(seq, &bitmap->file->f_path, " \t\n");
6341 }
6342
6343 seq_printf(seq, "\n");
6344 spin_unlock_irqrestore(&bitmap->lock, flags);
6345 }
6346
6347 seq_printf(seq, "\n");
6348 }
6349 mddev_unlock(mddev);
6350
6351 return 0;
6352 }
6353
6354 static const struct seq_operations md_seq_ops = {
6355 .start = md_seq_start,
6356 .next = md_seq_next,
6357 .stop = md_seq_stop,
6358 .show = md_seq_show,
6359 };
6360
6361 static int md_seq_open(struct inode *inode, struct file *file)
6362 {
6363 int error;
6364 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
6365 if (mi == NULL)
6366 return -ENOMEM;
6367
6368 error = seq_open(file, &md_seq_ops);
6369 if (error)
6370 kfree(mi);
6371 else {
6372 struct seq_file *p = file->private_data;
6373 p->private = mi;
6374 mi->event = atomic_read(&md_event_count);
6375 }
6376 return error;
6377 }
6378
6379 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6380 {
6381 struct seq_file *m = filp->private_data;
6382 struct mdstat_info *mi = m->private;
6383 int mask;
6384
6385 poll_wait(filp, &md_event_waiters, wait);
6386
6387 /* always allow read */
6388 mask = POLLIN | POLLRDNORM;
6389
6390 if (mi->event != atomic_read(&md_event_count))
6391 mask |= POLLERR | POLLPRI;
6392 return mask;
6393 }
6394
6395 static const struct file_operations md_seq_fops = {
6396 .owner = THIS_MODULE,
6397 .open = md_seq_open,
6398 .read = seq_read,
6399 .llseek = seq_lseek,
6400 .release = seq_release_private,
6401 .poll = mdstat_poll,
6402 };
6403
6404 int register_md_personality(struct mdk_personality *p)
6405 {
6406 spin_lock(&pers_lock);
6407 list_add_tail(&p->list, &pers_list);
6408 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
6409 spin_unlock(&pers_lock);
6410 return 0;
6411 }
6412
6413 int unregister_md_personality(struct mdk_personality *p)
6414 {
6415 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
6416 spin_lock(&pers_lock);
6417 list_del_init(&p->list);
6418 spin_unlock(&pers_lock);
6419 return 0;
6420 }
6421
6422 static int is_mddev_idle(mddev_t *mddev, int init)
6423 {
6424 mdk_rdev_t * rdev;
6425 int idle;
6426 int curr_events;
6427
6428 idle = 1;
6429 rcu_read_lock();
6430 rdev_for_each_rcu(rdev, mddev) {
6431 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
6432 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6433 (int)part_stat_read(&disk->part0, sectors[1]) -
6434 atomic_read(&disk->sync_io);
6435 /* sync IO will cause sync_io to increase before the disk_stats
6436 * as sync_io is counted when a request starts, and
6437 * disk_stats is counted when it completes.
6438 * So resync activity will cause curr_events to be smaller than
6439 * when there was no such activity.
6440 * non-sync IO will cause disk_stat to increase without
6441 * increasing sync_io so curr_events will (eventually)
6442 * be larger than it was before. Once it becomes
6443 * substantially larger, the test below will cause
6444 * the array to appear non-idle, and resync will slow
6445 * down.
6446 * If there is a lot of outstanding resync activity when
6447 * we set last_event to curr_events, then all that activity
6448 * completing might cause the array to appear non-idle
6449 * and resync will be slowed down even though there might
6450 * not have been non-resync activity. This will only
6451 * happen once though. 'last_events' will soon reflect
6452 * the state where there is little or no outstanding
6453 * resync requests, and further resync activity will
6454 * always make curr_events less than last_events.
6455 *
6456 */
6457 if (init || curr_events - rdev->last_events > 64) {
6458 rdev->last_events = curr_events;
6459 idle = 0;
6460 }
6461 }
6462 rcu_read_unlock();
6463 return idle;
6464 }
6465
6466 void md_done_sync(mddev_t *mddev, int blocks, int ok)
6467 {
6468 /* another "blocks" (512byte) blocks have been synced */
6469 atomic_sub(blocks, &mddev->recovery_active);
6470 wake_up(&mddev->recovery_wait);
6471 if (!ok) {
6472 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6473 md_wakeup_thread(mddev->thread);
6474 // stop recovery, signal do_sync ....
6475 }
6476 }
6477
6478
6479 /* md_write_start(mddev, bi)
6480 * If we need to update some array metadata (e.g. 'active' flag
6481 * in superblock) before writing, schedule a superblock update
6482 * and wait for it to complete.
6483 */
6484 void md_write_start(mddev_t *mddev, struct bio *bi)
6485 {
6486 int did_change = 0;
6487 if (bio_data_dir(bi) != WRITE)
6488 return;
6489
6490 BUG_ON(mddev->ro == 1);
6491 if (mddev->ro == 2) {
6492 /* need to switch to read/write */
6493 mddev->ro = 0;
6494 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6495 md_wakeup_thread(mddev->thread);
6496 md_wakeup_thread(mddev->sync_thread);
6497 did_change = 1;
6498 }
6499 atomic_inc(&mddev->writes_pending);
6500 if (mddev->safemode == 1)
6501 mddev->safemode = 0;
6502 if (mddev->in_sync) {
6503 spin_lock_irq(&mddev->write_lock);
6504 if (mddev->in_sync) {
6505 mddev->in_sync = 0;
6506 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6507 set_bit(MD_CHANGE_PENDING, &mddev->flags);
6508 md_wakeup_thread(mddev->thread);
6509 did_change = 1;
6510 }
6511 spin_unlock_irq(&mddev->write_lock);
6512 }
6513 if (did_change)
6514 sysfs_notify_dirent_safe(mddev->sysfs_state);
6515 wait_event(mddev->sb_wait,
6516 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6517 }
6518
6519 void md_write_end(mddev_t *mddev)
6520 {
6521 if (atomic_dec_and_test(&mddev->writes_pending)) {
6522 if (mddev->safemode == 2)
6523 md_wakeup_thread(mddev->thread);
6524 else if (mddev->safemode_delay)
6525 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6526 }
6527 }
6528
6529 /* md_allow_write(mddev)
6530 * Calling this ensures that the array is marked 'active' so that writes
6531 * may proceed without blocking. It is important to call this before
6532 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6533 * Must be called with mddev_lock held.
6534 *
6535 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6536 * is dropped, so return -EAGAIN after notifying userspace.
6537 */
6538 int md_allow_write(mddev_t *mddev)
6539 {
6540 if (!mddev->pers)
6541 return 0;
6542 if (mddev->ro)
6543 return 0;
6544 if (!mddev->pers->sync_request)
6545 return 0;
6546
6547 spin_lock_irq(&mddev->write_lock);
6548 if (mddev->in_sync) {
6549 mddev->in_sync = 0;
6550 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6551 set_bit(MD_CHANGE_PENDING, &mddev->flags);
6552 if (mddev->safemode_delay &&
6553 mddev->safemode == 0)
6554 mddev->safemode = 1;
6555 spin_unlock_irq(&mddev->write_lock);
6556 md_update_sb(mddev, 0);
6557 sysfs_notify_dirent_safe(mddev->sysfs_state);
6558 } else
6559 spin_unlock_irq(&mddev->write_lock);
6560
6561 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
6562 return -EAGAIN;
6563 else
6564 return 0;
6565 }
6566 EXPORT_SYMBOL_GPL(md_allow_write);
6567
6568 void md_unplug(mddev_t *mddev)
6569 {
6570 if (mddev->queue)
6571 blk_unplug(mddev->queue);
6572 if (mddev->plug)
6573 mddev->plug->unplug_fn(mddev->plug);
6574 }
6575
6576 #define SYNC_MARKS 10
6577 #define SYNC_MARK_STEP (3*HZ)
6578 void md_do_sync(mddev_t *mddev)
6579 {
6580 mddev_t *mddev2;
6581 unsigned int currspeed = 0,
6582 window;
6583 sector_t max_sectors,j, io_sectors;
6584 unsigned long mark[SYNC_MARKS];
6585 sector_t mark_cnt[SYNC_MARKS];
6586 int last_mark,m;
6587 struct list_head *tmp;
6588 sector_t last_check;
6589 int skipped = 0;
6590 mdk_rdev_t *rdev;
6591 char *desc;
6592
6593 /* just incase thread restarts... */
6594 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6595 return;
6596 if (mddev->ro) /* never try to sync a read-only array */
6597 return;
6598
6599 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6600 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6601 desc = "data-check";
6602 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6603 desc = "requested-resync";
6604 else
6605 desc = "resync";
6606 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6607 desc = "reshape";
6608 else
6609 desc = "recovery";
6610
6611 /* we overload curr_resync somewhat here.
6612 * 0 == not engaged in resync at all
6613 * 2 == checking that there is no conflict with another sync
6614 * 1 == like 2, but have yielded to allow conflicting resync to
6615 * commense
6616 * other == active in resync - this many blocks
6617 *
6618 * Before starting a resync we must have set curr_resync to
6619 * 2, and then checked that every "conflicting" array has curr_resync
6620 * less than ours. When we find one that is the same or higher
6621 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6622 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6623 * This will mean we have to start checking from the beginning again.
6624 *
6625 */
6626
6627 do {
6628 mddev->curr_resync = 2;
6629
6630 try_again:
6631 if (kthread_should_stop())
6632 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6633
6634 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6635 goto skip;
6636 for_each_mddev(mddev2, tmp) {
6637 if (mddev2 == mddev)
6638 continue;
6639 if (!mddev->parallel_resync
6640 && mddev2->curr_resync
6641 && match_mddev_units(mddev, mddev2)) {
6642 DEFINE_WAIT(wq);
6643 if (mddev < mddev2 && mddev->curr_resync == 2) {
6644 /* arbitrarily yield */
6645 mddev->curr_resync = 1;
6646 wake_up(&resync_wait);
6647 }
6648 if (mddev > mddev2 && mddev->curr_resync == 1)
6649 /* no need to wait here, we can wait the next
6650 * time 'round when curr_resync == 2
6651 */
6652 continue;
6653 /* We need to wait 'interruptible' so as not to
6654 * contribute to the load average, and not to
6655 * be caught by 'softlockup'
6656 */
6657 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
6658 if (!kthread_should_stop() &&
6659 mddev2->curr_resync >= mddev->curr_resync) {
6660 printk(KERN_INFO "md: delaying %s of %s"
6661 " until %s has finished (they"
6662 " share one or more physical units)\n",
6663 desc, mdname(mddev), mdname(mddev2));
6664 mddev_put(mddev2);
6665 if (signal_pending(current))
6666 flush_signals(current);
6667 schedule();
6668 finish_wait(&resync_wait, &wq);
6669 goto try_again;
6670 }
6671 finish_wait(&resync_wait, &wq);
6672 }
6673 }
6674 } while (mddev->curr_resync < 2);
6675
6676 j = 0;
6677 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6678 /* resync follows the size requested by the personality,
6679 * which defaults to physical size, but can be virtual size
6680 */
6681 max_sectors = mddev->resync_max_sectors;
6682 mddev->resync_mismatches = 0;
6683 /* we don't use the checkpoint if there's a bitmap */
6684 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6685 j = mddev->resync_min;
6686 else if (!mddev->bitmap)
6687 j = mddev->recovery_cp;
6688
6689 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6690 max_sectors = mddev->dev_sectors;
6691 else {
6692 /* recovery follows the physical size of devices */
6693 max_sectors = mddev->dev_sectors;
6694 j = MaxSector;
6695 rcu_read_lock();
6696 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6697 if (rdev->raid_disk >= 0 &&
6698 !test_bit(Faulty, &rdev->flags) &&
6699 !test_bit(In_sync, &rdev->flags) &&
6700 rdev->recovery_offset < j)
6701 j = rdev->recovery_offset;
6702 rcu_read_unlock();
6703 }
6704
6705 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6706 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6707 " %d KB/sec/disk.\n", speed_min(mddev));
6708 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6709 "(but not more than %d KB/sec) for %s.\n",
6710 speed_max(mddev), desc);
6711
6712 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6713
6714 io_sectors = 0;
6715 for (m = 0; m < SYNC_MARKS; m++) {
6716 mark[m] = jiffies;
6717 mark_cnt[m] = io_sectors;
6718 }
6719 last_mark = 0;
6720 mddev->resync_mark = mark[last_mark];
6721 mddev->resync_mark_cnt = mark_cnt[last_mark];
6722
6723 /*
6724 * Tune reconstruction:
6725 */
6726 window = 32*(PAGE_SIZE/512);
6727 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
6728 window/2,(unsigned long long) max_sectors/2);
6729
6730 atomic_set(&mddev->recovery_active, 0);
6731 last_check = 0;
6732
6733 if (j>2) {
6734 printk(KERN_INFO
6735 "md: resuming %s of %s from checkpoint.\n",
6736 desc, mdname(mddev));
6737 mddev->curr_resync = j;
6738 }
6739 mddev->curr_resync_completed = mddev->curr_resync;
6740
6741 while (j < max_sectors) {
6742 sector_t sectors;
6743
6744 skipped = 0;
6745
6746 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6747 ((mddev->curr_resync > mddev->curr_resync_completed &&
6748 (mddev->curr_resync - mddev->curr_resync_completed)
6749 > (max_sectors >> 4)) ||
6750 (j - mddev->curr_resync_completed)*2
6751 >= mddev->resync_max - mddev->curr_resync_completed
6752 )) {
6753 /* time to update curr_resync_completed */
6754 md_unplug(mddev);
6755 wait_event(mddev->recovery_wait,
6756 atomic_read(&mddev->recovery_active) == 0);
6757 mddev->curr_resync_completed =
6758 mddev->curr_resync;
6759 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6760 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6761 }
6762
6763 while (j >= mddev->resync_max && !kthread_should_stop()) {
6764 /* As this condition is controlled by user-space,
6765 * we can block indefinitely, so use '_interruptible'
6766 * to avoid triggering warnings.
6767 */
6768 flush_signals(current); /* just in case */
6769 wait_event_interruptible(mddev->recovery_wait,
6770 mddev->resync_max > j
6771 || kthread_should_stop());
6772 }
6773
6774 if (kthread_should_stop())
6775 goto interrupted;
6776
6777 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6778 currspeed < speed_min(mddev));
6779 if (sectors == 0) {
6780 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6781 goto out;
6782 }
6783
6784 if (!skipped) { /* actual IO requested */
6785 io_sectors += sectors;
6786 atomic_add(sectors, &mddev->recovery_active);
6787 }
6788
6789 j += sectors;
6790 if (j>1) mddev->curr_resync = j;
6791 mddev->curr_mark_cnt = io_sectors;
6792 if (last_check == 0)
6793 /* this is the earliers that rebuilt will be
6794 * visible in /proc/mdstat
6795 */
6796 md_new_event(mddev);
6797
6798 if (last_check + window > io_sectors || j == max_sectors)
6799 continue;
6800
6801 last_check = io_sectors;
6802
6803 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6804 break;
6805
6806 repeat:
6807 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6808 /* step marks */
6809 int next = (last_mark+1) % SYNC_MARKS;
6810
6811 mddev->resync_mark = mark[next];
6812 mddev->resync_mark_cnt = mark_cnt[next];
6813 mark[next] = jiffies;
6814 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
6815 last_mark = next;
6816 }
6817
6818
6819 if (kthread_should_stop())
6820 goto interrupted;
6821
6822
6823 /*
6824 * this loop exits only if either when we are slower than
6825 * the 'hard' speed limit, or the system was IO-idle for
6826 * a jiffy.
6827 * the system might be non-idle CPU-wise, but we only care
6828 * about not overloading the IO subsystem. (things like an
6829 * e2fsck being done on the RAID array should execute fast)
6830 */
6831 md_unplug(mddev);
6832 cond_resched();
6833
6834 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6835 /((jiffies-mddev->resync_mark)/HZ +1) +1;
6836
6837 if (currspeed > speed_min(mddev)) {
6838 if ((currspeed > speed_max(mddev)) ||
6839 !is_mddev_idle(mddev, 0)) {
6840 msleep(500);
6841 goto repeat;
6842 }
6843 }
6844 }
6845 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
6846 /*
6847 * this also signals 'finished resyncing' to md_stop
6848 */
6849 out:
6850 md_unplug(mddev);
6851
6852 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6853
6854 /* tell personality that we are finished */
6855 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
6856
6857 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
6858 mddev->curr_resync > 2) {
6859 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6860 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6861 if (mddev->curr_resync >= mddev->recovery_cp) {
6862 printk(KERN_INFO
6863 "md: checkpointing %s of %s.\n",
6864 desc, mdname(mddev));
6865 mddev->recovery_cp = mddev->curr_resync;
6866 }
6867 } else
6868 mddev->recovery_cp = MaxSector;
6869 } else {
6870 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6871 mddev->curr_resync = MaxSector;
6872 rcu_read_lock();
6873 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6874 if (rdev->raid_disk >= 0 &&
6875 mddev->delta_disks >= 0 &&
6876 !test_bit(Faulty, &rdev->flags) &&
6877 !test_bit(In_sync, &rdev->flags) &&
6878 rdev->recovery_offset < mddev->curr_resync)
6879 rdev->recovery_offset = mddev->curr_resync;
6880 rcu_read_unlock();
6881 }
6882 }
6883 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6884
6885 skip:
6886 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6887 /* We completed so min/max setting can be forgotten if used. */
6888 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6889 mddev->resync_min = 0;
6890 mddev->resync_max = MaxSector;
6891 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6892 mddev->resync_min = mddev->curr_resync_completed;
6893 mddev->curr_resync = 0;
6894 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6895 mddev->curr_resync_completed = 0;
6896 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6897 wake_up(&resync_wait);
6898 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6899 md_wakeup_thread(mddev->thread);
6900 return;
6901
6902 interrupted:
6903 /*
6904 * got a signal, exit.
6905 */
6906 printk(KERN_INFO
6907 "md: md_do_sync() got signal ... exiting\n");
6908 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6909 goto out;
6910
6911 }
6912 EXPORT_SYMBOL_GPL(md_do_sync);
6913
6914
6915 static int remove_and_add_spares(mddev_t *mddev)
6916 {
6917 mdk_rdev_t *rdev;
6918 int spares = 0;
6919
6920 mddev->curr_resync_completed = 0;
6921
6922 list_for_each_entry(rdev, &mddev->disks, same_set)
6923 if (rdev->raid_disk >= 0 &&
6924 !test_bit(Blocked, &rdev->flags) &&
6925 (test_bit(Faulty, &rdev->flags) ||
6926 ! test_bit(In_sync, &rdev->flags)) &&
6927 atomic_read(&rdev->nr_pending)==0) {
6928 if (mddev->pers->hot_remove_disk(
6929 mddev, rdev->raid_disk)==0) {
6930 char nm[20];
6931 sprintf(nm,"rd%d", rdev->raid_disk);
6932 sysfs_remove_link(&mddev->kobj, nm);
6933 rdev->raid_disk = -1;
6934 }
6935 }
6936
6937 if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) {
6938 list_for_each_entry(rdev, &mddev->disks, same_set) {
6939 if (rdev->raid_disk >= 0 &&
6940 !test_bit(In_sync, &rdev->flags) &&
6941 !test_bit(Blocked, &rdev->flags))
6942 spares++;
6943 if (rdev->raid_disk < 0
6944 && !test_bit(Faulty, &rdev->flags)) {
6945 rdev->recovery_offset = 0;
6946 if (mddev->pers->
6947 hot_add_disk(mddev, rdev) == 0) {
6948 char nm[20];
6949 sprintf(nm, "rd%d", rdev->raid_disk);
6950 if (sysfs_create_link(&mddev->kobj,
6951 &rdev->kobj, nm))
6952 /* failure here is OK */;
6953 spares++;
6954 md_new_event(mddev);
6955 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6956 } else
6957 break;
6958 }
6959 }
6960 }
6961 return spares;
6962 }
6963 /*
6964 * This routine is regularly called by all per-raid-array threads to
6965 * deal with generic issues like resync and super-block update.
6966 * Raid personalities that don't have a thread (linear/raid0) do not
6967 * need this as they never do any recovery or update the superblock.
6968 *
6969 * It does not do any resync itself, but rather "forks" off other threads
6970 * to do that as needed.
6971 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6972 * "->recovery" and create a thread at ->sync_thread.
6973 * When the thread finishes it sets MD_RECOVERY_DONE
6974 * and wakeups up this thread which will reap the thread and finish up.
6975 * This thread also removes any faulty devices (with nr_pending == 0).
6976 *
6977 * The overall approach is:
6978 * 1/ if the superblock needs updating, update it.
6979 * 2/ If a recovery thread is running, don't do anything else.
6980 * 3/ If recovery has finished, clean up, possibly marking spares active.
6981 * 4/ If there are any faulty devices, remove them.
6982 * 5/ If array is degraded, try to add spares devices
6983 * 6/ If array has spares or is not in-sync, start a resync thread.
6984 */
6985 void md_check_recovery(mddev_t *mddev)
6986 {
6987 mdk_rdev_t *rdev;
6988
6989
6990 if (mddev->bitmap)
6991 bitmap_daemon_work(mddev);
6992
6993 if (mddev->ro)
6994 return;
6995
6996 if (signal_pending(current)) {
6997 if (mddev->pers->sync_request && !mddev->external) {
6998 printk(KERN_INFO "md: %s in immediate safe mode\n",
6999 mdname(mddev));
7000 mddev->safemode = 2;
7001 }
7002 flush_signals(current);
7003 }
7004
7005 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
7006 return;
7007 if ( ! (
7008 (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) ||
7009 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7010 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
7011 (mddev->external == 0 && mddev->safemode == 1) ||
7012 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
7013 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
7014 ))
7015 return;
7016
7017 if (mddev_trylock(mddev)) {
7018 int spares = 0;
7019
7020 if (mddev->ro) {
7021 /* Only thing we do on a ro array is remove
7022 * failed devices.
7023 */
7024 remove_and_add_spares(mddev);
7025 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7026 goto unlock;
7027 }
7028
7029 if (!mddev->external) {
7030 int did_change = 0;
7031 spin_lock_irq(&mddev->write_lock);
7032 if (mddev->safemode &&
7033 !atomic_read(&mddev->writes_pending) &&
7034 !mddev->in_sync &&
7035 mddev->recovery_cp == MaxSector) {
7036 mddev->in_sync = 1;
7037 did_change = 1;
7038 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7039 }
7040 if (mddev->safemode == 1)
7041 mddev->safemode = 0;
7042 spin_unlock_irq(&mddev->write_lock);
7043 if (did_change)
7044 sysfs_notify_dirent_safe(mddev->sysfs_state);
7045 }
7046
7047 if (mddev->flags)
7048 md_update_sb(mddev, 0);
7049
7050 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7051 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7052 /* resync/recovery still happening */
7053 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7054 goto unlock;
7055 }
7056 if (mddev->sync_thread) {
7057 /* resync has finished, collect result */
7058 md_unregister_thread(mddev->sync_thread);
7059 mddev->sync_thread = NULL;
7060 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7061 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7062 /* success...*/
7063 /* activate any spares */
7064 if (mddev->pers->spare_active(mddev))
7065 sysfs_notify(&mddev->kobj, NULL,
7066 "degraded");
7067 }
7068 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7069 mddev->pers->finish_reshape)
7070 mddev->pers->finish_reshape(mddev);
7071 md_update_sb(mddev, 1);
7072
7073 /* if array is no-longer degraded, then any saved_raid_disk
7074 * information must be scrapped
7075 */
7076 if (!mddev->degraded)
7077 list_for_each_entry(rdev, &mddev->disks, same_set)
7078 rdev->saved_raid_disk = -1;
7079
7080 mddev->recovery = 0;
7081 /* flag recovery needed just to double check */
7082 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7083 sysfs_notify_dirent_safe(mddev->sysfs_action);
7084 md_new_event(mddev);
7085 goto unlock;
7086 }
7087 /* Set RUNNING before clearing NEEDED to avoid
7088 * any transients in the value of "sync_action".
7089 */
7090 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7091 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7092 /* Clear some bits that don't mean anything, but
7093 * might be left set
7094 */
7095 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7096 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7097
7098 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7099 goto unlock;
7100 /* no recovery is running.
7101 * remove any failed drives, then
7102 * add spares if possible.
7103 * Spare are also removed and re-added, to allow
7104 * the personality to fail the re-add.
7105 */
7106
7107 if (mddev->reshape_position != MaxSector) {
7108 if (mddev->pers->check_reshape == NULL ||
7109 mddev->pers->check_reshape(mddev) != 0)
7110 /* Cannot proceed */
7111 goto unlock;
7112 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7113 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7114 } else if ((spares = remove_and_add_spares(mddev))) {
7115 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7116 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7117 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7118 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7119 } else if (mddev->recovery_cp < MaxSector) {
7120 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7121 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7122 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7123 /* nothing to be done ... */
7124 goto unlock;
7125
7126 if (mddev->pers->sync_request) {
7127 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
7128 /* We are adding a device or devices to an array
7129 * which has the bitmap stored on all devices.
7130 * So make sure all bitmap pages get written
7131 */
7132 bitmap_write_all(mddev->bitmap);
7133 }
7134 mddev->sync_thread = md_register_thread(md_do_sync,
7135 mddev,
7136 "resync");
7137 if (!mddev->sync_thread) {
7138 printk(KERN_ERR "%s: could not start resync"
7139 " thread...\n",
7140 mdname(mddev));
7141 /* leave the spares where they are, it shouldn't hurt */
7142 mddev->recovery = 0;
7143 } else
7144 md_wakeup_thread(mddev->sync_thread);
7145 sysfs_notify_dirent_safe(mddev->sysfs_action);
7146 md_new_event(mddev);
7147 }
7148 unlock:
7149 if (!mddev->sync_thread) {
7150 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7151 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7152 &mddev->recovery))
7153 if (mddev->sysfs_action)
7154 sysfs_notify_dirent_safe(mddev->sysfs_action);
7155 }
7156 mddev_unlock(mddev);
7157 }
7158 }
7159
7160 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
7161 {
7162 sysfs_notify_dirent_safe(rdev->sysfs_state);
7163 wait_event_timeout(rdev->blocked_wait,
7164 !test_bit(Blocked, &rdev->flags),
7165 msecs_to_jiffies(5000));
7166 rdev_dec_pending(rdev, mddev);
7167 }
7168 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7169
7170 static int md_notify_reboot(struct notifier_block *this,
7171 unsigned long code, void *x)
7172 {
7173 struct list_head *tmp;
7174 mddev_t *mddev;
7175
7176 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
7177
7178 printk(KERN_INFO "md: stopping all md devices.\n");
7179
7180 for_each_mddev(mddev, tmp)
7181 if (mddev_trylock(mddev)) {
7182 /* Force a switch to readonly even array
7183 * appears to still be in use. Hence
7184 * the '100'.
7185 */
7186 md_set_readonly(mddev, 100);
7187 mddev_unlock(mddev);
7188 }
7189 /*
7190 * certain more exotic SCSI devices are known to be
7191 * volatile wrt too early system reboots. While the
7192 * right place to handle this issue is the given
7193 * driver, we do want to have a safe RAID driver ...
7194 */
7195 mdelay(1000*1);
7196 }
7197 return NOTIFY_DONE;
7198 }
7199
7200 static struct notifier_block md_notifier = {
7201 .notifier_call = md_notify_reboot,
7202 .next = NULL,
7203 .priority = INT_MAX, /* before any real devices */
7204 };
7205
7206 static void md_geninit(void)
7207 {
7208 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
7209
7210 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
7211 }
7212
7213 static int __init md_init(void)
7214 {
7215 if (register_blkdev(MD_MAJOR, "md"))
7216 return -1;
7217 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
7218 unregister_blkdev(MD_MAJOR, "md");
7219 return -1;
7220 }
7221 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
7222 md_probe, NULL, NULL);
7223 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
7224 md_probe, NULL, NULL);
7225
7226 register_reboot_notifier(&md_notifier);
7227 raid_table_header = register_sysctl_table(raid_root_table);
7228
7229 md_geninit();
7230 return 0;
7231 }
7232
7233
7234 #ifndef MODULE
7235
7236 /*
7237 * Searches all registered partitions for autorun RAID arrays
7238 * at boot time.
7239 */
7240
7241 static LIST_HEAD(all_detected_devices);
7242 struct detected_devices_node {
7243 struct list_head list;
7244 dev_t dev;
7245 };
7246
7247 void md_autodetect_dev(dev_t dev)
7248 {
7249 struct detected_devices_node *node_detected_dev;
7250
7251 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
7252 if (node_detected_dev) {
7253 node_detected_dev->dev = dev;
7254 list_add_tail(&node_detected_dev->list, &all_detected_devices);
7255 } else {
7256 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
7257 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
7258 }
7259 }
7260
7261
7262 static void autostart_arrays(int part)
7263 {
7264 mdk_rdev_t *rdev;
7265 struct detected_devices_node *node_detected_dev;
7266 dev_t dev;
7267 int i_scanned, i_passed;
7268
7269 i_scanned = 0;
7270 i_passed = 0;
7271
7272 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
7273
7274 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
7275 i_scanned++;
7276 node_detected_dev = list_entry(all_detected_devices.next,
7277 struct detected_devices_node, list);
7278 list_del(&node_detected_dev->list);
7279 dev = node_detected_dev->dev;
7280 kfree(node_detected_dev);
7281 rdev = md_import_device(dev,0, 90);
7282 if (IS_ERR(rdev))
7283 continue;
7284
7285 if (test_bit(Faulty, &rdev->flags)) {
7286 MD_BUG();
7287 continue;
7288 }
7289 set_bit(AutoDetected, &rdev->flags);
7290 list_add(&rdev->same_set, &pending_raid_disks);
7291 i_passed++;
7292 }
7293
7294 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
7295 i_scanned, i_passed);
7296
7297 autorun_devices(part);
7298 }
7299
7300 #endif /* !MODULE */
7301
7302 static __exit void md_exit(void)
7303 {
7304 mddev_t *mddev;
7305 struct list_head *tmp;
7306
7307 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
7308 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
7309
7310 unregister_blkdev(MD_MAJOR,"md");
7311 unregister_blkdev(mdp_major, "mdp");
7312 unregister_reboot_notifier(&md_notifier);
7313 unregister_sysctl_table(raid_table_header);
7314 remove_proc_entry("mdstat", NULL);
7315 for_each_mddev(mddev, tmp) {
7316 export_array(mddev);
7317 mddev->hold_active = 0;
7318 }
7319 }
7320
7321 subsys_initcall(md_init);
7322 module_exit(md_exit)
7323
7324 static int get_ro(char *buffer, struct kernel_param *kp)
7325 {
7326 return sprintf(buffer, "%d", start_readonly);
7327 }
7328 static int set_ro(const char *val, struct kernel_param *kp)
7329 {
7330 char *e;
7331 int num = simple_strtoul(val, &e, 10);
7332 if (*val && (*e == '\0' || *e == '\n')) {
7333 start_readonly = num;
7334 return 0;
7335 }
7336 return -EINVAL;
7337 }
7338
7339 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
7340 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
7341
7342 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
7343
7344 EXPORT_SYMBOL(register_md_personality);
7345 EXPORT_SYMBOL(unregister_md_personality);
7346 EXPORT_SYMBOL(md_error);
7347 EXPORT_SYMBOL(md_done_sync);
7348 EXPORT_SYMBOL(md_write_start);
7349 EXPORT_SYMBOL(md_write_end);
7350 EXPORT_SYMBOL(md_register_thread);
7351 EXPORT_SYMBOL(md_unregister_thread);
7352 EXPORT_SYMBOL(md_wakeup_thread);
7353 EXPORT_SYMBOL(md_check_recovery);
7354 MODULE_LICENSE("GPL");
7355 MODULE_DESCRIPTION("MD RAID framework");
7356 MODULE_ALIAS("md");
7357 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree