1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 md.c : Multiple Devices driver for Linux
4 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5
6 completely rewritten, based on the MD driver code from Marc Zyngier
7
8 Changes:
9
10 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
11 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
12 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
13 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
14 - kmod support by: Cyrus Durgin
15 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
16 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17
18 - lots of fixes and improvements to the RAID1/RAID5 and generic
19 RAID code (such as request based resynchronization):
20
21 Neil Brown <neilb@cse.unsw.edu.au>.
22
23 - persistent bitmap code
24 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25
26
27 Errors, Warnings, etc.
28 Please use:
29 pr_crit() for error conditions that risk data loss
30 pr_err() for error conditions that are unexpected, like an IO error
31 or internal inconsistency
32 pr_warn() for error conditions that could have been predicated, like
33 adding a device to an array when it has incompatible metadata
34 pr_info() for every interesting, very rare events, like an array starting
35 or stopping, or resync starting or stopping
36 pr_debug() for everything else.
37
38 */
39
40 #include <linux/sched/mm.h>
41 #include <linux/sched/signal.h>
42 #include <linux/kthread.h>
43 #include <linux/blkdev.h>
44 #include <linux/blk-integrity.h>
45 #include <linux/badblocks.h>
46 #include <linux/sysctl.h>
47 #include <linux/seq_file.h>
48 #include <linux/fs.h>
49 #include <linux/poll.h>
50 #include <linux/ctype.h>
51 #include <linux/string.h>
52 #include <linux/hdreg.h>
53 #include <linux/proc_fs.h>
54 #include <linux/random.h>
55 #include <linux/major.h>
56 #include <linux/module.h>
57 #include <linux/reboot.h>
58 #include <linux/file.h>
59 #include <linux/compat.h>
60 #include <linux/delay.h>
61 #include <linux/raid/md_p.h>
62 #include <linux/raid/md_u.h>
63 #include <linux/raid/detect.h>
64 #include <linux/slab.h>
65 #include <linux/percpu-refcount.h>
66 #include <linux/part_stat.h>
67
68 #include <trace/events/block.h>
69 #include "md.h"
70 #include "md-bitmap.h"
71 #include "md-cluster.h"
72
73 /* pers_list is a list of registered personalities protected by pers_lock. */
74 static LIST_HEAD(pers_list);
75 static DEFINE_SPINLOCK(pers_lock);
76
77 static const struct kobj_type md_ktype;
78
79 struct md_cluster_operations *md_cluster_ops;
80 EXPORT_SYMBOL(md_cluster_ops);
81 static struct module *md_cluster_mod;
82
83 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
84 static struct workqueue_struct *md_wq;
85 static struct workqueue_struct *md_misc_wq;
86 struct workqueue_struct *md_bitmap_wq;
87
88 static int remove_and_add_spares(struct mddev *mddev,
89 struct md_rdev *this);
90 static void mddev_detach(struct mddev *mddev);
91 static void export_rdev(struct md_rdev *rdev, struct mddev *mddev);
92 static void md_wakeup_thread_directly(struct md_thread __rcu *thread);
93
94 /*
95 * Default number of read corrections we'll attempt on an rdev
96 * before ejecting it from the array. We divide the read error
97 * count by 2 for every hour elapsed between read errors.
98 */
99 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
100 /* Default safemode delay: 200 msec */
101 #define DEFAULT_SAFEMODE_DELAY ((200 * HZ)/1000 +1)
102 /*
103 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
104 * is 1000 KB/sec, so the extra system load does not show up that much.
105 * Increase it if you want to have more _guaranteed_ speed. Note that
106 * the RAID driver will use the maximum available bandwidth if the IO
107 * subsystem is idle. There is also an 'absolute maximum' reconstruction
108 * speed limit - in case reconstruction slows down your system despite
109 * idle IO detection.
110 *
111 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
112 * or /sys/block/mdX/md/sync_speed_{min,max}
113 */
114
115 static int sysctl_speed_limit_min = 1000;
116 static int sysctl_speed_limit_max = 200000;
speed_min(struct mddev * mddev)117 static inline int speed_min(struct mddev *mddev)
118 {
119 return mddev->sync_speed_min ?
120 mddev->sync_speed_min : sysctl_speed_limit_min;
121 }
122
speed_max(struct mddev * mddev)123 static inline int speed_max(struct mddev *mddev)
124 {
125 return mddev->sync_speed_max ?
126 mddev->sync_speed_max : sysctl_speed_limit_max;
127 }
128
rdev_uninit_serial(struct md_rdev * rdev)129 static void rdev_uninit_serial(struct md_rdev *rdev)
130 {
131 if (!test_and_clear_bit(CollisionCheck, &rdev->flags))
132 return;
133
134 kvfree(rdev->serial);
135 rdev->serial = NULL;
136 }
137
rdevs_uninit_serial(struct mddev * mddev)138 static void rdevs_uninit_serial(struct mddev *mddev)
139 {
140 struct md_rdev *rdev;
141
142 rdev_for_each(rdev, mddev)
143 rdev_uninit_serial(rdev);
144 }
145
rdev_init_serial(struct md_rdev * rdev)146 static int rdev_init_serial(struct md_rdev *rdev)
147 {
148 /* serial_nums equals with BARRIER_BUCKETS_NR */
149 int i, serial_nums = 1 << ((PAGE_SHIFT - ilog2(sizeof(atomic_t))));
150 struct serial_in_rdev *serial = NULL;
151
152 if (test_bit(CollisionCheck, &rdev->flags))
153 return 0;
154
155 serial = kvmalloc(sizeof(struct serial_in_rdev) * serial_nums,
156 GFP_KERNEL);
157 if (!serial)
158 return -ENOMEM;
159
160 for (i = 0; i < serial_nums; i++) {
161 struct serial_in_rdev *serial_tmp = &serial[i];
162
163 spin_lock_init(&serial_tmp->serial_lock);
164 serial_tmp->serial_rb = RB_ROOT_CACHED;
165 init_waitqueue_head(&serial_tmp->serial_io_wait);
166 }
167
168 rdev->serial = serial;
169 set_bit(CollisionCheck, &rdev->flags);
170
171 return 0;
172 }
173
rdevs_init_serial(struct mddev * mddev)174 static int rdevs_init_serial(struct mddev *mddev)
175 {
176 struct md_rdev *rdev;
177 int ret = 0;
178
179 rdev_for_each(rdev, mddev) {
180 ret = rdev_init_serial(rdev);
181 if (ret)
182 break;
183 }
184
185 /* Free all resources if pool is not existed */
186 if (ret && !mddev->serial_info_pool)
187 rdevs_uninit_serial(mddev);
188
189 return ret;
190 }
191
192 /*
193 * rdev needs to enable serial stuffs if it meets the conditions:
194 * 1. it is multi-queue device flaged with writemostly.
195 * 2. the write-behind mode is enabled.
196 */
rdev_need_serial(struct md_rdev * rdev)197 static int rdev_need_serial(struct md_rdev *rdev)
198 {
199 return (rdev && rdev->mddev->bitmap_info.max_write_behind > 0 &&
200 rdev->bdev->bd_disk->queue->nr_hw_queues != 1 &&
201 test_bit(WriteMostly, &rdev->flags));
202 }
203
204 /*
205 * Init resource for rdev(s), then create serial_info_pool if:
206 * 1. rdev is the first device which return true from rdev_enable_serial.
207 * 2. rdev is NULL, means we want to enable serialization for all rdevs.
208 */
mddev_create_serial_pool(struct mddev * mddev,struct md_rdev * rdev,bool is_suspend)209 void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev,
210 bool is_suspend)
211 {
212 int ret = 0;
213
214 if (rdev && !rdev_need_serial(rdev) &&
215 !test_bit(CollisionCheck, &rdev->flags))
216 return;
217
218 if (!is_suspend)
219 mddev_suspend(mddev);
220
221 if (!rdev)
222 ret = rdevs_init_serial(mddev);
223 else
224 ret = rdev_init_serial(rdev);
225 if (ret)
226 goto abort;
227
228 if (mddev->serial_info_pool == NULL) {
229 /*
230 * already in memalloc noio context by
231 * mddev_suspend()
232 */
233 mddev->serial_info_pool =
234 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
235 sizeof(struct serial_info));
236 if (!mddev->serial_info_pool) {
237 rdevs_uninit_serial(mddev);
238 pr_err("can't alloc memory pool for serialization\n");
239 }
240 }
241
242 abort:
243 if (!is_suspend)
244 mddev_resume(mddev);
245 }
246
247 /*
248 * Free resource from rdev(s), and destroy serial_info_pool under conditions:
249 * 1. rdev is the last device flaged with CollisionCheck.
250 * 2. when bitmap is destroyed while policy is not enabled.
251 * 3. for disable policy, the pool is destroyed only when no rdev needs it.
252 */
mddev_destroy_serial_pool(struct mddev * mddev,struct md_rdev * rdev,bool is_suspend)253 void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev,
254 bool is_suspend)
255 {
256 if (rdev && !test_bit(CollisionCheck, &rdev->flags))
257 return;
258
259 if (mddev->serial_info_pool) {
260 struct md_rdev *temp;
261 int num = 0; /* used to track if other rdevs need the pool */
262
263 if (!is_suspend)
264 mddev_suspend(mddev);
265 rdev_for_each(temp, mddev) {
266 if (!rdev) {
267 if (!mddev->serialize_policy ||
268 !rdev_need_serial(temp))
269 rdev_uninit_serial(temp);
270 else
271 num++;
272 } else if (temp != rdev &&
273 test_bit(CollisionCheck, &temp->flags))
274 num++;
275 }
276
277 if (rdev)
278 rdev_uninit_serial(rdev);
279
280 if (num)
281 pr_info("The mempool could be used by other devices\n");
282 else {
283 mempool_destroy(mddev->serial_info_pool);
284 mddev->serial_info_pool = NULL;
285 }
286 if (!is_suspend)
287 mddev_resume(mddev);
288 }
289 }
290
291 static struct ctl_table_header *raid_table_header;
292
293 static struct ctl_table raid_table[] = {
294 {
295 .procname = "speed_limit_min",
296 .data = &sysctl_speed_limit_min,
297 .maxlen = sizeof(int),
298 .mode = S_IRUGO|S_IWUSR,
299 .proc_handler = proc_dointvec,
300 },
301 {
302 .procname = "speed_limit_max",
303 .data = &sysctl_speed_limit_max,
304 .maxlen = sizeof(int),
305 .mode = S_IRUGO|S_IWUSR,
306 .proc_handler = proc_dointvec,
307 },
308 { }
309 };
310
311 static int start_readonly;
312
313 /*
314 * The original mechanism for creating an md device is to create
315 * a device node in /dev and to open it. This causes races with device-close.
316 * The preferred method is to write to the "new_array" module parameter.
317 * This can avoid races.
318 * Setting create_on_open to false disables the original mechanism
319 * so all the races disappear.
320 */
321 static bool create_on_open = true;
322
323 /*
324 * We have a system wide 'event count' that is incremented
325 * on any 'interesting' event, and readers of /proc/mdstat
326 * can use 'poll' or 'select' to find out when the event
327 * count increases.
328 *
329 * Events are:
330 * start array, stop array, error, add device, remove device,
331 * start build, activate spare
332 */
333 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
334 static atomic_t md_event_count;
md_new_event(void)335 void md_new_event(void)
336 {
337 atomic_inc(&md_event_count);
338 wake_up(&md_event_waiters);
339 }
340 EXPORT_SYMBOL_GPL(md_new_event);
341
342 /*
343 * Enables to iterate over all existing md arrays
344 * all_mddevs_lock protects this list.
345 */
346 static LIST_HEAD(all_mddevs);
347 static DEFINE_SPINLOCK(all_mddevs_lock);
348
349 /* Rather than calling directly into the personality make_request function,
350 * IO requests come here first so that we can check if the device is
351 * being suspended pending a reconfiguration.
352 * We hold a refcount over the call to ->make_request. By the time that
353 * call has finished, the bio has been linked into some internal structure
354 * and so is visible to ->quiesce(), so we don't need the refcount any more.
355 */
is_suspended(struct mddev * mddev,struct bio * bio)356 static bool is_suspended(struct mddev *mddev, struct bio *bio)
357 {
358 if (is_md_suspended(mddev))
359 return true;
360 if (bio_data_dir(bio) != WRITE)
361 return false;
362 if (mddev->suspend_lo >= mddev->suspend_hi)
363 return false;
364 if (bio->bi_iter.bi_sector >= mddev->suspend_hi)
365 return false;
366 if (bio_end_sector(bio) < mddev->suspend_lo)
367 return false;
368 return true;
369 }
370
md_handle_request(struct mddev * mddev,struct bio * bio)371 void md_handle_request(struct mddev *mddev, struct bio *bio)
372 {
373 check_suspended:
374 if (is_suspended(mddev, bio)) {
375 DEFINE_WAIT(__wait);
376 /* Bail out if REQ_NOWAIT is set for the bio */
377 if (bio->bi_opf & REQ_NOWAIT) {
378 bio_wouldblock_error(bio);
379 return;
380 }
381 for (;;) {
382 prepare_to_wait(&mddev->sb_wait, &__wait,
383 TASK_UNINTERRUPTIBLE);
384 if (!is_suspended(mddev, bio))
385 break;
386 schedule();
387 }
388 finish_wait(&mddev->sb_wait, &__wait);
389 }
390 if (!percpu_ref_tryget_live(&mddev->active_io))
391 goto check_suspended;
392
393 if (!mddev->pers->make_request(mddev, bio)) {
394 percpu_ref_put(&mddev->active_io);
395 goto check_suspended;
396 }
397
398 percpu_ref_put(&mddev->active_io);
399 }
400 EXPORT_SYMBOL(md_handle_request);
401
md_submit_bio(struct bio * bio)402 static void md_submit_bio(struct bio *bio)
403 {
404 const int rw = bio_data_dir(bio);
405 struct mddev *mddev = bio->bi_bdev->bd_disk->private_data;
406
407 if (mddev == NULL || mddev->pers == NULL) {
408 bio_io_error(bio);
409 return;
410 }
411
412 if (unlikely(test_bit(MD_BROKEN, &mddev->flags)) && (rw == WRITE)) {
413 bio_io_error(bio);
414 return;
415 }
416
417 bio = bio_split_to_limits(bio);
418 if (!bio)
419 return;
420
421 if (mddev->ro == MD_RDONLY && unlikely(rw == WRITE)) {
422 if (bio_sectors(bio) != 0)
423 bio->bi_status = BLK_STS_IOERR;
424 bio_endio(bio);
425 return;
426 }
427
428 /* bio could be mergeable after passing to underlayer */
429 bio->bi_opf &= ~REQ_NOMERGE;
430
431 md_handle_request(mddev, bio);
432 }
433
434 /* mddev_suspend makes sure no new requests are submitted
435 * to the device, and that any requests that have been submitted
436 * are completely handled.
437 * Once mddev_detach() is called and completes, the module will be
438 * completely unused.
439 */
mddev_suspend(struct mddev * mddev)440 void mddev_suspend(struct mddev *mddev)
441 {
442 struct md_thread *thread = rcu_dereference_protected(mddev->thread,
443 lockdep_is_held(&mddev->reconfig_mutex));
444
445 WARN_ON_ONCE(thread && current == thread->tsk);
446 if (mddev->suspended++)
447 return;
448 wake_up(&mddev->sb_wait);
449 set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags);
450 percpu_ref_kill(&mddev->active_io);
451
452 if (mddev->pers && mddev->pers->prepare_suspend)
453 mddev->pers->prepare_suspend(mddev);
454
455 wait_event(mddev->sb_wait, percpu_ref_is_zero(&mddev->active_io));
456 clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags);
457 wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags));
458
459 /* restrict memory reclaim I/O during raid array is suspend */
460 mddev->noio_flag = memalloc_noio_save();
461 }
462 EXPORT_SYMBOL_GPL(mddev_suspend);
463
mddev_resume(struct mddev * mddev)464 void mddev_resume(struct mddev *mddev)
465 {
466 lockdep_assert_held(&mddev->reconfig_mutex);
467 if (--mddev->suspended)
468 return;
469
470 /* entred the memalloc scope from mddev_suspend() */
471 memalloc_noio_restore(mddev->noio_flag);
472
473 percpu_ref_resurrect(&mddev->active_io);
474 wake_up(&mddev->sb_wait);
475
476 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
477 md_wakeup_thread(mddev->thread);
478 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
479 }
480 EXPORT_SYMBOL_GPL(mddev_resume);
481
482 /*
483 * Generic flush handling for md
484 */
485
md_end_flush(struct bio * bio)486 static void md_end_flush(struct bio *bio)
487 {
488 struct md_rdev *rdev = bio->bi_private;
489 struct mddev *mddev = rdev->mddev;
490
491 bio_put(bio);
492
493 rdev_dec_pending(rdev, mddev);
494
495 if (atomic_dec_and_test(&mddev->flush_pending))
496 /* The pre-request flush has finished */
497 queue_work(md_wq, &mddev->flush_work);
498 }
499
500 static void md_submit_flush_data(struct work_struct *ws);
501
submit_flushes(struct work_struct * ws)502 static void submit_flushes(struct work_struct *ws)
503 {
504 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
505 struct md_rdev *rdev;
506
507 mddev->start_flush = ktime_get_boottime();
508 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
509 atomic_set(&mddev->flush_pending, 1);
510 rcu_read_lock();
511 rdev_for_each_rcu(rdev, mddev)
512 if (rdev->raid_disk >= 0 &&
513 !test_bit(Faulty, &rdev->flags)) {
514 struct bio *bi;
515
516 atomic_inc(&rdev->nr_pending);
517 rcu_read_unlock();
518 bi = bio_alloc_bioset(rdev->bdev, 0,
519 REQ_OP_WRITE | REQ_PREFLUSH,
520 GFP_NOIO, &mddev->bio_set);
521 bi->bi_end_io = md_end_flush;
522 bi->bi_private = rdev;
523 atomic_inc(&mddev->flush_pending);
524 submit_bio(bi);
525 rcu_read_lock();
526 }
527 rcu_read_unlock();
528 if (atomic_dec_and_test(&mddev->flush_pending))
529 queue_work(md_wq, &mddev->flush_work);
530 }
531
md_submit_flush_data(struct work_struct * ws)532 static void md_submit_flush_data(struct work_struct *ws)
533 {
534 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
535 struct bio *bio = mddev->flush_bio;
536
537 /*
538 * must reset flush_bio before calling into md_handle_request to avoid a
539 * deadlock, because other bios passed md_handle_request suspend check
540 * could wait for this and below md_handle_request could wait for those
541 * bios because of suspend check
542 */
543 spin_lock_irq(&mddev->lock);
544 mddev->prev_flush_start = mddev->start_flush;
545 mddev->flush_bio = NULL;
546 spin_unlock_irq(&mddev->lock);
547 wake_up(&mddev->sb_wait);
548
549 if (bio->bi_iter.bi_size == 0) {
550 /* an empty barrier - all done */
551 bio_endio(bio);
552 } else {
553 bio->bi_opf &= ~REQ_PREFLUSH;
554
555 /*
556 * make_requst() will never return error here, it only
557 * returns error in raid5_make_request() by dm-raid.
558 * Since dm always splits data and flush operation into
559 * two separate io, io size of flush submitted by dm
560 * always is 0, make_request() will not be called here.
561 */
562 if (WARN_ON_ONCE(!mddev->pers->make_request(mddev, bio)))
563 bio_io_error(bio);;
564 }
565
566 /* The pair is percpu_ref_get() from md_flush_request() */
567 percpu_ref_put(&mddev->active_io);
568 }
569
570 /*
571 * Manages consolidation of flushes and submitting any flushes needed for
572 * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is
573 * being finished in another context. Returns false if the flushing is
574 * complete but still needs the I/O portion of the bio to be processed.
575 */
md_flush_request(struct mddev * mddev,struct bio * bio)576 bool md_flush_request(struct mddev *mddev, struct bio *bio)
577 {
578 ktime_t req_start = ktime_get_boottime();
579 spin_lock_irq(&mddev->lock);
580 /* flush requests wait until ongoing flush completes,
581 * hence coalescing all the pending requests.
582 */
583 wait_event_lock_irq(mddev->sb_wait,
584 !mddev->flush_bio ||
585 ktime_before(req_start, mddev->prev_flush_start),
586 mddev->lock);
587 /* new request after previous flush is completed */
588 if (ktime_after(req_start, mddev->prev_flush_start)) {
589 WARN_ON(mddev->flush_bio);
590 /*
591 * Grab a reference to make sure mddev_suspend() will wait for
592 * this flush to be done.
593 *
594 * md_flush_reqeust() is called under md_handle_request() and
595 * 'active_io' is already grabbed, hence percpu_ref_is_zero()
596 * won't pass, percpu_ref_tryget_live() can't be used because
597 * percpu_ref_kill() can be called by mddev_suspend()
598 * concurrently.
599 */
600 WARN_ON(percpu_ref_is_zero(&mddev->active_io));
601 percpu_ref_get(&mddev->active_io);
602 mddev->flush_bio = bio;
603 bio = NULL;
604 }
605 spin_unlock_irq(&mddev->lock);
606
607 if (!bio) {
608 INIT_WORK(&mddev->flush_work, submit_flushes);
609 queue_work(md_wq, &mddev->flush_work);
610 } else {
611 /* flush was performed for some other bio while we waited. */
612 if (bio->bi_iter.bi_size == 0)
613 /* an empty barrier - all done */
614 bio_endio(bio);
615 else {
616 bio->bi_opf &= ~REQ_PREFLUSH;
617 return false;
618 }
619 }
620 return true;
621 }
622 EXPORT_SYMBOL(md_flush_request);
623
mddev_get(struct mddev * mddev)624 static inline struct mddev *mddev_get(struct mddev *mddev)
625 {
626 lockdep_assert_held(&all_mddevs_lock);
627
628 if (test_bit(MD_DELETED, &mddev->flags))
629 return NULL;
630 atomic_inc(&mddev->active);
631 return mddev;
632 }
633
634 static void mddev_delayed_delete(struct work_struct *ws);
635
__mddev_put(struct mddev * mddev)636 static void __mddev_put(struct mddev *mddev)
637 {
638 if (mddev->raid_disks || !list_empty(&mddev->disks) ||
639 mddev->ctime || mddev->hold_active)
640 return;
641
642 /* Array is not configured at all, and not held active, so destroy it */
643 set_bit(MD_DELETED, &mddev->flags);
644
645 /*
646 * Call queue_work inside the spinlock so that flush_workqueue() after
647 * mddev_find will succeed in waiting for the work to be done.
648 */
649 queue_work(md_misc_wq, &mddev->del_work);
650 }
651
mddev_put(struct mddev * mddev)652 void mddev_put(struct mddev *mddev)
653 {
654 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
655 return;
656
657 __mddev_put(mddev);
658 spin_unlock(&all_mddevs_lock);
659 }
660
661 static void md_safemode_timeout(struct timer_list *t);
662 static void md_start_sync(struct work_struct *ws);
663
mddev_init(struct mddev * mddev)664 void mddev_init(struct mddev *mddev)
665 {
666 mutex_init(&mddev->open_mutex);
667 mutex_init(&mddev->reconfig_mutex);
668 mutex_init(&mddev->sync_mutex);
669 mutex_init(&mddev->bitmap_info.mutex);
670 INIT_LIST_HEAD(&mddev->disks);
671 INIT_LIST_HEAD(&mddev->all_mddevs);
672 INIT_LIST_HEAD(&mddev->deleting);
673 timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0);
674 atomic_set(&mddev->active, 1);
675 atomic_set(&mddev->openers, 0);
676 atomic_set(&mddev->sync_seq, 0);
677 spin_lock_init(&mddev->lock);
678 atomic_set(&mddev->flush_pending, 0);
679 init_waitqueue_head(&mddev->sb_wait);
680 init_waitqueue_head(&mddev->recovery_wait);
681 mddev->reshape_position = MaxSector;
682 mddev->reshape_backwards = 0;
683 mddev->last_sync_action = "none";
684 mddev->resync_min = 0;
685 mddev->resync_max = MaxSector;
686 mddev->level = LEVEL_NONE;
687
688 INIT_WORK(&mddev->sync_work, md_start_sync);
689 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
690 }
691 EXPORT_SYMBOL_GPL(mddev_init);
692
mddev_find_locked(dev_t unit)693 static struct mddev *mddev_find_locked(dev_t unit)
694 {
695 struct mddev *mddev;
696
697 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
698 if (mddev->unit == unit)
699 return mddev;
700
701 return NULL;
702 }
703
704 /* find an unused unit number */
mddev_alloc_unit(void)705 static dev_t mddev_alloc_unit(void)
706 {
707 static int next_minor = 512;
708 int start = next_minor;
709 bool is_free = 0;
710 dev_t dev = 0;
711
712 while (!is_free) {
713 dev = MKDEV(MD_MAJOR, next_minor);
714 next_minor++;
715 if (next_minor > MINORMASK)
716 next_minor = 0;
717 if (next_minor == start)
718 return 0; /* Oh dear, all in use. */
719 is_free = !mddev_find_locked(dev);
720 }
721
722 return dev;
723 }
724
mddev_alloc(dev_t unit)725 static struct mddev *mddev_alloc(dev_t unit)
726 {
727 struct mddev *new;
728 int error;
729
730 if (unit && MAJOR(unit) != MD_MAJOR)
731 unit &= ~((1 << MdpMinorShift) - 1);
732
733 new = kzalloc(sizeof(*new), GFP_KERNEL);
734 if (!new)
735 return ERR_PTR(-ENOMEM);
736 mddev_init(new);
737
738 spin_lock(&all_mddevs_lock);
739 if (unit) {
740 error = -EEXIST;
741 if (mddev_find_locked(unit))
742 goto out_free_new;
743 new->unit = unit;
744 if (MAJOR(unit) == MD_MAJOR)
745 new->md_minor = MINOR(unit);
746 else
747 new->md_minor = MINOR(unit) >> MdpMinorShift;
748 new->hold_active = UNTIL_IOCTL;
749 } else {
750 error = -ENODEV;
751 new->unit = mddev_alloc_unit();
752 if (!new->unit)
753 goto out_free_new;
754 new->md_minor = MINOR(new->unit);
755 new->hold_active = UNTIL_STOP;
756 }
757
758 list_add(&new->all_mddevs, &all_mddevs);
759 spin_unlock(&all_mddevs_lock);
760 return new;
761 out_free_new:
762 spin_unlock(&all_mddevs_lock);
763 kfree(new);
764 return ERR_PTR(error);
765 }
766
mddev_free(struct mddev * mddev)767 static void mddev_free(struct mddev *mddev)
768 {
769 spin_lock(&all_mddevs_lock);
770 list_del(&mddev->all_mddevs);
771 spin_unlock(&all_mddevs_lock);
772
773 kfree(mddev);
774 }
775
776 static const struct attribute_group md_redundancy_group;
777
mddev_unlock(struct mddev * mddev)778 void mddev_unlock(struct mddev *mddev)
779 {
780 struct md_rdev *rdev;
781 struct md_rdev *tmp;
782 LIST_HEAD(delete);
783
784 if (!list_empty(&mddev->deleting))
785 list_splice_init(&mddev->deleting, &delete);
786
787 if (mddev->to_remove) {
788 /* These cannot be removed under reconfig_mutex as
789 * an access to the files will try to take reconfig_mutex
790 * while holding the file unremovable, which leads to
791 * a deadlock.
792 * So hold set sysfs_active while the remove in happeing,
793 * and anything else which might set ->to_remove or my
794 * otherwise change the sysfs namespace will fail with
795 * -EBUSY if sysfs_active is still set.
796 * We set sysfs_active under reconfig_mutex and elsewhere
797 * test it under the same mutex to ensure its correct value
798 * is seen.
799 */
800 const struct attribute_group *to_remove = mddev->to_remove;
801 mddev->to_remove = NULL;
802 mddev->sysfs_active = 1;
803 mutex_unlock(&mddev->reconfig_mutex);
804
805 if (mddev->kobj.sd) {
806 if (to_remove != &md_redundancy_group)
807 sysfs_remove_group(&mddev->kobj, to_remove);
808 if (mddev->pers == NULL ||
809 mddev->pers->sync_request == NULL) {
810 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
811 if (mddev->sysfs_action)
812 sysfs_put(mddev->sysfs_action);
813 if (mddev->sysfs_completed)
814 sysfs_put(mddev->sysfs_completed);
815 if (mddev->sysfs_degraded)
816 sysfs_put(mddev->sysfs_degraded);
817 mddev->sysfs_action = NULL;
818 mddev->sysfs_completed = NULL;
819 mddev->sysfs_degraded = NULL;
820 }
821 }
822 mddev->sysfs_active = 0;
823 } else
824 mutex_unlock(&mddev->reconfig_mutex);
825
826 md_wakeup_thread(mddev->thread);
827 wake_up(&mddev->sb_wait);
828
829 list_for_each_entry_safe(rdev, tmp, &delete, same_set) {
830 list_del_init(&rdev->same_set);
831 kobject_del(&rdev->kobj);
832 export_rdev(rdev, mddev);
833 }
834 }
835 EXPORT_SYMBOL_GPL(mddev_unlock);
836
md_find_rdev_nr_rcu(struct mddev * mddev,int nr)837 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
838 {
839 struct md_rdev *rdev;
840
841 rdev_for_each_rcu(rdev, mddev)
842 if (rdev->desc_nr == nr)
843 return rdev;
844
845 return NULL;
846 }
847 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
848
find_rdev(struct mddev * mddev,dev_t dev)849 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
850 {
851 struct md_rdev *rdev;
852
853 rdev_for_each(rdev, mddev)
854 if (rdev->bdev->bd_dev == dev)
855 return rdev;
856
857 return NULL;
858 }
859
md_find_rdev_rcu(struct mddev * mddev,dev_t dev)860 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev)
861 {
862 struct md_rdev *rdev;
863
864 rdev_for_each_rcu(rdev, mddev)
865 if (rdev->bdev->bd_dev == dev)
866 return rdev;
867
868 return NULL;
869 }
870 EXPORT_SYMBOL_GPL(md_find_rdev_rcu);
871
find_pers(int level,char * clevel)872 static struct md_personality *find_pers(int level, char *clevel)
873 {
874 struct md_personality *pers;
875 list_for_each_entry(pers, &pers_list, list) {
876 if (level != LEVEL_NONE && pers->level == level)
877 return pers;
878 if (strcmp(pers->name, clevel)==0)
879 return pers;
880 }
881 return NULL;
882 }
883
884 /* return the offset of the super block in 512byte sectors */
calc_dev_sboffset(struct md_rdev * rdev)885 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
886 {
887 return MD_NEW_SIZE_SECTORS(bdev_nr_sectors(rdev->bdev));
888 }
889
alloc_disk_sb(struct md_rdev * rdev)890 static int alloc_disk_sb(struct md_rdev *rdev)
891 {
892 rdev->sb_page = alloc_page(GFP_KERNEL);
893 if (!rdev->sb_page)
894 return -ENOMEM;
895 return 0;
896 }
897
md_rdev_clear(struct md_rdev * rdev)898 void md_rdev_clear(struct md_rdev *rdev)
899 {
900 if (rdev->sb_page) {
901 put_page(rdev->sb_page);
902 rdev->sb_loaded = 0;
903 rdev->sb_page = NULL;
904 rdev->sb_start = 0;
905 rdev->sectors = 0;
906 }
907 if (rdev->bb_page) {
908 put_page(rdev->bb_page);
909 rdev->bb_page = NULL;
910 }
911 badblocks_exit(&rdev->badblocks);
912 }
913 EXPORT_SYMBOL_GPL(md_rdev_clear);
914
super_written(struct bio * bio)915 static void super_written(struct bio *bio)
916 {
917 struct md_rdev *rdev = bio->bi_private;
918 struct mddev *mddev = rdev->mddev;
919
920 if (bio->bi_status) {
921 pr_err("md: %s gets error=%d\n", __func__,
922 blk_status_to_errno(bio->bi_status));
923 md_error(mddev, rdev);
924 if (!test_bit(Faulty, &rdev->flags)
925 && (bio->bi_opf & MD_FAILFAST)) {
926 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
927 set_bit(LastDev, &rdev->flags);
928 }
929 } else
930 clear_bit(LastDev, &rdev->flags);
931
932 bio_put(bio);
933
934 rdev_dec_pending(rdev, mddev);
935
936 if (atomic_dec_and_test(&mddev->pending_writes))
937 wake_up(&mddev->sb_wait);
938 }
939
md_super_write(struct mddev * mddev,struct md_rdev * rdev,sector_t sector,int size,struct page * page)940 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
941 sector_t sector, int size, struct page *page)
942 {
943 /* write first size bytes of page to sector of rdev
944 * Increment mddev->pending_writes before returning
945 * and decrement it on completion, waking up sb_wait
946 * if zero is reached.
947 * If an error occurred, call md_error
948 */
949 struct bio *bio;
950
951 if (!page)
952 return;
953
954 if (test_bit(Faulty, &rdev->flags))
955 return;
956
957 bio = bio_alloc_bioset(rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev,
958 1,
959 REQ_OP_WRITE | REQ_SYNC | REQ_IDLE | REQ_META
960 | REQ_PREFLUSH | REQ_FUA,
961 GFP_NOIO, &mddev->sync_set);
962
963 atomic_inc(&rdev->nr_pending);
964
965 bio->bi_iter.bi_sector = sector;
966 __bio_add_page(bio, page, size, 0);
967 bio->bi_private = rdev;
968 bio->bi_end_io = super_written;
969
970 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
971 test_bit(FailFast, &rdev->flags) &&
972 !test_bit(LastDev, &rdev->flags))
973 bio->bi_opf |= MD_FAILFAST;
974
975 atomic_inc(&mddev->pending_writes);
976 submit_bio(bio);
977 }
978
md_super_wait(struct mddev * mddev)979 int md_super_wait(struct mddev *mddev)
980 {
981 /* wait for all superblock writes that were scheduled to complete */
982 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
983 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
984 return -EAGAIN;
985 return 0;
986 }
987
sync_page_io(struct md_rdev * rdev,sector_t sector,int size,struct page * page,blk_opf_t opf,bool metadata_op)988 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
989 struct page *page, blk_opf_t opf, bool metadata_op)
990 {
991 struct bio bio;
992 struct bio_vec bvec;
993
994 if (metadata_op && rdev->meta_bdev)
995 bio_init(&bio, rdev->meta_bdev, &bvec, 1, opf);
996 else
997 bio_init(&bio, rdev->bdev, &bvec, 1, opf);
998
999 if (metadata_op)
1000 bio.bi_iter.bi_sector = sector + rdev->sb_start;
1001 else if (rdev->mddev->reshape_position != MaxSector &&
1002 (rdev->mddev->reshape_backwards ==
1003 (sector >= rdev->mddev->reshape_position)))
1004 bio.bi_iter.bi_sector = sector + rdev->new_data_offset;
1005 else
1006 bio.bi_iter.bi_sector = sector + rdev->data_offset;
1007 __bio_add_page(&bio, page, size, 0);
1008
1009 submit_bio_wait(&bio);
1010
1011 return !bio.bi_status;
1012 }
1013 EXPORT_SYMBOL_GPL(sync_page_io);
1014
read_disk_sb(struct md_rdev * rdev,int size)1015 static int read_disk_sb(struct md_rdev *rdev, int size)
1016 {
1017 if (rdev->sb_loaded)
1018 return 0;
1019
1020 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, true))
1021 goto fail;
1022 rdev->sb_loaded = 1;
1023 return 0;
1024
1025 fail:
1026 pr_err("md: disabled device %pg, could not read superblock.\n",
1027 rdev->bdev);
1028 return -EINVAL;
1029 }
1030
md_uuid_equal(mdp_super_t * sb1,mdp_super_t * sb2)1031 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1032 {
1033 return sb1->set_uuid0 == sb2->set_uuid0 &&
1034 sb1->set_uuid1 == sb2->set_uuid1 &&
1035 sb1->set_uuid2 == sb2->set_uuid2 &&
1036 sb1->set_uuid3 == sb2->set_uuid3;
1037 }
1038
md_sb_equal(mdp_super_t * sb1,mdp_super_t * sb2)1039 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1040 {
1041 int ret;
1042 mdp_super_t *tmp1, *tmp2;
1043
1044 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
1045 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
1046
1047 if (!tmp1 || !tmp2) {
1048 ret = 0;
1049 goto abort;
1050 }
1051
1052 *tmp1 = *sb1;
1053 *tmp2 = *sb2;
1054
1055 /*
1056 * nr_disks is not constant
1057 */
1058 tmp1->nr_disks = 0;
1059 tmp2->nr_disks = 0;
1060
1061 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
1062 abort:
1063 kfree(tmp1);
1064 kfree(tmp2);
1065 return ret;
1066 }
1067
md_csum_fold(u32 csum)1068 static u32 md_csum_fold(u32 csum)
1069 {
1070 csum = (csum & 0xffff) + (csum >> 16);
1071 return (csum & 0xffff) + (csum >> 16);
1072 }
1073
calc_sb_csum(mdp_super_t * sb)1074 static unsigned int calc_sb_csum(mdp_super_t *sb)
1075 {
1076 u64 newcsum = 0;
1077 u32 *sb32 = (u32*)sb;
1078 int i;
1079 unsigned int disk_csum, csum;
1080
1081 disk_csum = sb->sb_csum;
1082 sb->sb_csum = 0;
1083
1084 for (i = 0; i < MD_SB_BYTES/4 ; i++)
1085 newcsum += sb32[i];
1086 csum = (newcsum & 0xffffffff) + (newcsum>>32);
1087
1088 #ifdef CONFIG_ALPHA
1089 /* This used to use csum_partial, which was wrong for several
1090 * reasons including that different results are returned on
1091 * different architectures. It isn't critical that we get exactly
1092 * the same return value as before (we always csum_fold before
1093 * testing, and that removes any differences). However as we
1094 * know that csum_partial always returned a 16bit value on
1095 * alphas, do a fold to maximise conformity to previous behaviour.
1096 */
1097 sb->sb_csum = md_csum_fold(disk_csum);
1098 #else
1099 sb->sb_csum = disk_csum;
1100 #endif
1101 return csum;
1102 }
1103
1104 /*
1105 * Handle superblock details.
1106 * We want to be able to handle multiple superblock formats
1107 * so we have a common interface to them all, and an array of
1108 * different handlers.
1109 * We rely on user-space to write the initial superblock, and support
1110 * reading and updating of superblocks.
1111 * Interface methods are:
1112 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1113 * loads and validates a superblock on dev.
1114 * if refdev != NULL, compare superblocks on both devices
1115 * Return:
1116 * 0 - dev has a superblock that is compatible with refdev
1117 * 1 - dev has a superblock that is compatible and newer than refdev
1118 * so dev should be used as the refdev in future
1119 * -EINVAL superblock incompatible or invalid
1120 * -othererror e.g. -EIO
1121 *
1122 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1123 * Verify that dev is acceptable into mddev.
1124 * The first time, mddev->raid_disks will be 0, and data from
1125 * dev should be merged in. Subsequent calls check that dev
1126 * is new enough. Return 0 or -EINVAL
1127 *
1128 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1129 * Update the superblock for rdev with data in mddev
1130 * This does not write to disc.
1131 *
1132 */
1133
1134 struct super_type {
1135 char *name;
1136 struct module *owner;
1137 int (*load_super)(struct md_rdev *rdev,
1138 struct md_rdev *refdev,
1139 int minor_version);
1140 int (*validate_super)(struct mddev *mddev,
1141 struct md_rdev *freshest,
1142 struct md_rdev *rdev);
1143 void (*sync_super)(struct mddev *mddev,
1144 struct md_rdev *rdev);
1145 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1146 sector_t num_sectors);
1147 int (*allow_new_offset)(struct md_rdev *rdev,
1148 unsigned long long new_offset);
1149 };
1150
1151 /*
1152 * Check that the given mddev has no bitmap.
1153 *
1154 * This function is called from the run method of all personalities that do not
1155 * support bitmaps. It prints an error message and returns non-zero if mddev
1156 * has a bitmap. Otherwise, it returns 0.
1157 *
1158 */
md_check_no_bitmap(struct mddev * mddev)1159 int md_check_no_bitmap(struct mddev *mddev)
1160 {
1161 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1162 return 0;
1163 pr_warn("%s: bitmaps are not supported for %s\n",
1164 mdname(mddev), mddev->pers->name);
1165 return 1;
1166 }
1167 EXPORT_SYMBOL(md_check_no_bitmap);
1168
1169 /*
1170 * load_super for 0.90.0
1171 */
super_90_load(struct md_rdev * rdev,struct md_rdev * refdev,int minor_version)1172 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1173 {
1174 mdp_super_t *sb;
1175 int ret;
1176 bool spare_disk = true;
1177
1178 /*
1179 * Calculate the position of the superblock (512byte sectors),
1180 * it's at the end of the disk.
1181 *
1182 * It also happens to be a multiple of 4Kb.
1183 */
1184 rdev->sb_start = calc_dev_sboffset(rdev);
1185
1186 ret = read_disk_sb(rdev, MD_SB_BYTES);
1187 if (ret)
1188 return ret;
1189
1190 ret = -EINVAL;
1191
1192 sb = page_address(rdev->sb_page);
1193
1194 if (sb->md_magic != MD_SB_MAGIC) {
1195 pr_warn("md: invalid raid superblock magic on %pg\n",
1196 rdev->bdev);
1197 goto abort;
1198 }
1199
1200 if (sb->major_version != 0 ||
1201 sb->minor_version < 90 ||
1202 sb->minor_version > 91) {
1203 pr_warn("Bad version number %d.%d on %pg\n",
1204 sb->major_version, sb->minor_version, rdev->bdev);
1205 goto abort;
1206 }
1207
1208 if (sb->raid_disks <= 0)
1209 goto abort;
1210
1211 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1212 pr_warn("md: invalid superblock checksum on %pg\n", rdev->bdev);
1213 goto abort;
1214 }
1215
1216 rdev->preferred_minor = sb->md_minor;
1217 rdev->data_offset = 0;
1218 rdev->new_data_offset = 0;
1219 rdev->sb_size = MD_SB_BYTES;
1220 rdev->badblocks.shift = -1;
1221
1222 if (sb->level == LEVEL_MULTIPATH)
1223 rdev->desc_nr = -1;
1224 else
1225 rdev->desc_nr = sb->this_disk.number;
1226
1227 /* not spare disk, or LEVEL_MULTIPATH */
1228 if (sb->level == LEVEL_MULTIPATH ||
1229 (rdev->desc_nr >= 0 &&
1230 rdev->desc_nr < MD_SB_DISKS &&
1231 sb->disks[rdev->desc_nr].state &
1232 ((1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))))
1233 spare_disk = false;
1234
1235 if (!refdev) {
1236 if (!spare_disk)
1237 ret = 1;
1238 else
1239 ret = 0;
1240 } else {
1241 __u64 ev1, ev2;
1242 mdp_super_t *refsb = page_address(refdev->sb_page);
1243 if (!md_uuid_equal(refsb, sb)) {
1244 pr_warn("md: %pg has different UUID to %pg\n",
1245 rdev->bdev, refdev->bdev);
1246 goto abort;
1247 }
1248 if (!md_sb_equal(refsb, sb)) {
1249 pr_warn("md: %pg has same UUID but different superblock to %pg\n",
1250 rdev->bdev, refdev->bdev);
1251 goto abort;
1252 }
1253 ev1 = md_event(sb);
1254 ev2 = md_event(refsb);
1255
1256 if (!spare_disk && ev1 > ev2)
1257 ret = 1;
1258 else
1259 ret = 0;
1260 }
1261 rdev->sectors = rdev->sb_start;
1262 /* Limit to 4TB as metadata cannot record more than that.
1263 * (not needed for Linear and RAID0 as metadata doesn't
1264 * record this size)
1265 */
1266 if ((u64)rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1267 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1268
1269 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1270 /* "this cannot possibly happen" ... */
1271 ret = -EINVAL;
1272
1273 abort:
1274 return ret;
1275 }
1276
1277 /*
1278 * validate_super for 0.90.0
1279 * note: we are not using "freshest" for 0.9 superblock
1280 */
super_90_validate(struct mddev * mddev,struct md_rdev * freshest,struct md_rdev * rdev)1281 static int super_90_validate(struct mddev *mddev, struct md_rdev *freshest, struct md_rdev *rdev)
1282 {
1283 mdp_disk_t *desc;
1284 mdp_super_t *sb = page_address(rdev->sb_page);
1285 __u64 ev1 = md_event(sb);
1286
1287 rdev->raid_disk = -1;
1288 clear_bit(Faulty, &rdev->flags);
1289 clear_bit(In_sync, &rdev->flags);
1290 clear_bit(Bitmap_sync, &rdev->flags);
1291 clear_bit(WriteMostly, &rdev->flags);
1292
1293 if (mddev->raid_disks == 0) {
1294 mddev->major_version = 0;
1295 mddev->minor_version = sb->minor_version;
1296 mddev->patch_version = sb->patch_version;
1297 mddev->external = 0;
1298 mddev->chunk_sectors = sb->chunk_size >> 9;
1299 mddev->ctime = sb->ctime;
1300 mddev->utime = sb->utime;
1301 mddev->level = sb->level;
1302 mddev->clevel[0] = 0;
1303 mddev->layout = sb->layout;
1304 mddev->raid_disks = sb->raid_disks;
1305 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1306 mddev->events = ev1;
1307 mddev->bitmap_info.offset = 0;
1308 mddev->bitmap_info.space = 0;
1309 /* bitmap can use 60 K after the 4K superblocks */
1310 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1311 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1312 mddev->reshape_backwards = 0;
1313
1314 if (mddev->minor_version >= 91) {
1315 mddev->reshape_position = sb->reshape_position;
1316 mddev->delta_disks = sb->delta_disks;
1317 mddev->new_level = sb->new_level;
1318 mddev->new_layout = sb->new_layout;
1319 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1320 if (mddev->delta_disks < 0)
1321 mddev->reshape_backwards = 1;
1322 } else {
1323 mddev->reshape_position = MaxSector;
1324 mddev->delta_disks = 0;
1325 mddev->new_level = mddev->level;
1326 mddev->new_layout = mddev->layout;
1327 mddev->new_chunk_sectors = mddev->chunk_sectors;
1328 }
1329 if (mddev->level == 0)
1330 mddev->layout = -1;
1331
1332 if (sb->state & (1<<MD_SB_CLEAN))
1333 mddev->recovery_cp = MaxSector;
1334 else {
1335 if (sb->events_hi == sb->cp_events_hi &&
1336 sb->events_lo == sb->cp_events_lo) {
1337 mddev->recovery_cp = sb->recovery_cp;
1338 } else
1339 mddev->recovery_cp = 0;
1340 }
1341
1342 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1343 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1344 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1345 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1346
1347 mddev->max_disks = MD_SB_DISKS;
1348
1349 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1350 mddev->bitmap_info.file == NULL) {
1351 mddev->bitmap_info.offset =
1352 mddev->bitmap_info.default_offset;
1353 mddev->bitmap_info.space =
1354 mddev->bitmap_info.default_space;
1355 }
1356
1357 } else if (mddev->pers == NULL) {
1358 /* Insist on good event counter while assembling, except
1359 * for spares (which don't need an event count) */
1360 ++ev1;
1361 if (sb->disks[rdev->desc_nr].state & (
1362 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1363 if (ev1 < mddev->events)
1364 return -EINVAL;
1365 } else if (mddev->bitmap) {
1366 /* if adding to array with a bitmap, then we can accept an
1367 * older device ... but not too old.
1368 */
1369 if (ev1 < mddev->bitmap->events_cleared)
1370 return 0;
1371 if (ev1 < mddev->events)
1372 set_bit(Bitmap_sync, &rdev->flags);
1373 } else {
1374 if (ev1 < mddev->events)
1375 /* just a hot-add of a new device, leave raid_disk at -1 */
1376 return 0;
1377 }
1378
1379 if (mddev->level != LEVEL_MULTIPATH) {
1380 desc = sb->disks + rdev->desc_nr;
1381
1382 if (desc->state & (1<<MD_DISK_FAULTY))
1383 set_bit(Faulty, &rdev->flags);
1384 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1385 desc->raid_disk < mddev->raid_disks */) {
1386 set_bit(In_sync, &rdev->flags);
1387 rdev->raid_disk = desc->raid_disk;
1388 rdev->saved_raid_disk = desc->raid_disk;
1389 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1390 /* active but not in sync implies recovery up to
1391 * reshape position. We don't know exactly where
1392 * that is, so set to zero for now */
1393 if (mddev->minor_version >= 91) {
1394 rdev->recovery_offset = 0;
1395 rdev->raid_disk = desc->raid_disk;
1396 }
1397 }
1398 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1399 set_bit(WriteMostly, &rdev->flags);
1400 if (desc->state & (1<<MD_DISK_FAILFAST))
1401 set_bit(FailFast, &rdev->flags);
1402 } else /* MULTIPATH are always insync */
1403 set_bit(In_sync, &rdev->flags);
1404 return 0;
1405 }
1406
1407 /*
1408 * sync_super for 0.90.0
1409 */
super_90_sync(struct mddev * mddev,struct md_rdev * rdev)1410 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1411 {
1412 mdp_super_t *sb;
1413 struct md_rdev *rdev2;
1414 int next_spare = mddev->raid_disks;
1415
1416 /* make rdev->sb match mddev data..
1417 *
1418 * 1/ zero out disks
1419 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1420 * 3/ any empty disks < next_spare become removed
1421 *
1422 * disks[0] gets initialised to REMOVED because
1423 * we cannot be sure from other fields if it has
1424 * been initialised or not.
1425 */
1426 int i;
1427 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1428
1429 rdev->sb_size = MD_SB_BYTES;
1430
1431 sb = page_address(rdev->sb_page);
1432
1433 memset(sb, 0, sizeof(*sb));
1434
1435 sb->md_magic = MD_SB_MAGIC;
1436 sb->major_version = mddev->major_version;
1437 sb->patch_version = mddev->patch_version;
1438 sb->gvalid_words = 0; /* ignored */
1439 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1440 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1441 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1442 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1443
1444 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1445 sb->level = mddev->level;
1446 sb->size = mddev->dev_sectors / 2;
1447 sb->raid_disks = mddev->raid_disks;
1448 sb->md_minor = mddev->md_minor;
1449 sb->not_persistent = 0;
1450 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1451 sb->state = 0;
1452 sb->events_hi = (mddev->events>>32);
1453 sb->events_lo = (u32)mddev->events;
1454
1455 if (mddev->reshape_position == MaxSector)
1456 sb->minor_version = 90;
1457 else {
1458 sb->minor_version = 91;
1459 sb->reshape_position = mddev->reshape_position;
1460 sb->new_level = mddev->new_level;
1461 sb->delta_disks = mddev->delta_disks;
1462 sb->new_layout = mddev->new_layout;
1463 sb->new_chunk = mddev->new_chunk_sectors << 9;
1464 }
1465 mddev->minor_version = sb->minor_version;
1466 if (mddev->in_sync)
1467 {
1468 sb->recovery_cp = mddev->recovery_cp;
1469 sb->cp_events_hi = (mddev->events>>32);
1470 sb->cp_events_lo = (u32)mddev->events;
1471 if (mddev->recovery_cp == MaxSector)
1472 sb->state = (1<< MD_SB_CLEAN);
1473 } else
1474 sb->recovery_cp = 0;
1475
1476 sb->layout = mddev->layout;
1477 sb->chunk_size = mddev->chunk_sectors << 9;
1478
1479 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1480 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1481
1482 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1483 rdev_for_each(rdev2, mddev) {
1484 mdp_disk_t *d;
1485 int desc_nr;
1486 int is_active = test_bit(In_sync, &rdev2->flags);
1487
1488 if (rdev2->raid_disk >= 0 &&
1489 sb->minor_version >= 91)
1490 /* we have nowhere to store the recovery_offset,
1491 * but if it is not below the reshape_position,
1492 * we can piggy-back on that.
1493 */
1494 is_active = 1;
1495 if (rdev2->raid_disk < 0 ||
1496 test_bit(Faulty, &rdev2->flags))
1497 is_active = 0;
1498 if (is_active)
1499 desc_nr = rdev2->raid_disk;
1500 else
1501 desc_nr = next_spare++;
1502 rdev2->desc_nr = desc_nr;
1503 d = &sb->disks[rdev2->desc_nr];
1504 nr_disks++;
1505 d->number = rdev2->desc_nr;
1506 d->major = MAJOR(rdev2->bdev->bd_dev);
1507 d->minor = MINOR(rdev2->bdev->bd_dev);
1508 if (is_active)
1509 d->raid_disk = rdev2->raid_disk;
1510 else
1511 d->raid_disk = rdev2->desc_nr; /* compatibility */
1512 if (test_bit(Faulty, &rdev2->flags))
1513 d->state = (1<<MD_DISK_FAULTY);
1514 else if (is_active) {
1515 d->state = (1<<MD_DISK_ACTIVE);
1516 if (test_bit(In_sync, &rdev2->flags))
1517 d->state |= (1<<MD_DISK_SYNC);
1518 active++;
1519 working++;
1520 } else {
1521 d->state = 0;
1522 spare++;
1523 working++;
1524 }
1525 if (test_bit(WriteMostly, &rdev2->flags))
1526 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1527 if (test_bit(FailFast, &rdev2->flags))
1528 d->state |= (1<<MD_DISK_FAILFAST);
1529 }
1530 /* now set the "removed" and "faulty" bits on any missing devices */
1531 for (i=0 ; i < mddev->raid_disks ; i++) {
1532 mdp_disk_t *d = &sb->disks[i];
1533 if (d->state == 0 && d->number == 0) {
1534 d->number = i;
1535 d->raid_disk = i;
1536 d->state = (1<<MD_DISK_REMOVED);
1537 d->state |= (1<<MD_DISK_FAULTY);
1538 failed++;
1539 }
1540 }
1541 sb->nr_disks = nr_disks;
1542 sb->active_disks = active;
1543 sb->working_disks = working;
1544 sb->failed_disks = failed;
1545 sb->spare_disks = spare;
1546
1547 sb->this_disk = sb->disks[rdev->desc_nr];
1548 sb->sb_csum = calc_sb_csum(sb);
1549 }
1550
1551 /*
1552 * rdev_size_change for 0.90.0
1553 */
1554 static unsigned long long
super_90_rdev_size_change(struct md_rdev * rdev,sector_t num_sectors)1555 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1556 {
1557 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1558 return 0; /* component must fit device */
1559 if (rdev->mddev->bitmap_info.offset)
1560 return 0; /* can't move bitmap */
1561 rdev->sb_start = calc_dev_sboffset(rdev);
1562 if (!num_sectors || num_sectors > rdev->sb_start)
1563 num_sectors = rdev->sb_start;
1564 /* Limit to 4TB as metadata cannot record more than that.
1565 * 4TB == 2^32 KB, or 2*2^32 sectors.
1566 */
1567 if ((u64)num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1568 num_sectors = (sector_t)(2ULL << 32) - 2;
1569 do {
1570 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1571 rdev->sb_page);
1572 } while (md_super_wait(rdev->mddev) < 0);
1573 return num_sectors;
1574 }
1575
1576 static int
super_90_allow_new_offset(struct md_rdev * rdev,unsigned long long new_offset)1577 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1578 {
1579 /* non-zero offset changes not possible with v0.90 */
1580 return new_offset == 0;
1581 }
1582
1583 /*
1584 * version 1 superblock
1585 */
1586
calc_sb_1_csum(struct mdp_superblock_1 * sb)1587 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1588 {
1589 __le32 disk_csum;
1590 u32 csum;
1591 unsigned long long newcsum;
1592 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1593 __le32 *isuper = (__le32*)sb;
1594
1595 disk_csum = sb->sb_csum;
1596 sb->sb_csum = 0;
1597 newcsum = 0;
1598 for (; size >= 4; size -= 4)
1599 newcsum += le32_to_cpu(*isuper++);
1600
1601 if (size == 2)
1602 newcsum += le16_to_cpu(*(__le16*) isuper);
1603
1604 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1605 sb->sb_csum = disk_csum;
1606 return cpu_to_le32(csum);
1607 }
1608
super_1_load(struct md_rdev * rdev,struct md_rdev * refdev,int minor_version)1609 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1610 {
1611 struct mdp_superblock_1 *sb;
1612 int ret;
1613 sector_t sb_start;
1614 sector_t sectors;
1615 int bmask;
1616 bool spare_disk = true;
1617
1618 /*
1619 * Calculate the position of the superblock in 512byte sectors.
1620 * It is always aligned to a 4K boundary and
1621 * depeding on minor_version, it can be:
1622 * 0: At least 8K, but less than 12K, from end of device
1623 * 1: At start of device
1624 * 2: 4K from start of device.
1625 */
1626 switch(minor_version) {
1627 case 0:
1628 sb_start = bdev_nr_sectors(rdev->bdev) - 8 * 2;
1629 sb_start &= ~(sector_t)(4*2-1);
1630 break;
1631 case 1:
1632 sb_start = 0;
1633 break;
1634 case 2:
1635 sb_start = 8;
1636 break;
1637 default:
1638 return -EINVAL;
1639 }
1640 rdev->sb_start = sb_start;
1641
1642 /* superblock is rarely larger than 1K, but it can be larger,
1643 * and it is safe to read 4k, so we do that
1644 */
1645 ret = read_disk_sb(rdev, 4096);
1646 if (ret) return ret;
1647
1648 sb = page_address(rdev->sb_page);
1649
1650 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1651 sb->major_version != cpu_to_le32(1) ||
1652 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1653 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1654 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1655 return -EINVAL;
1656
1657 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1658 pr_warn("md: invalid superblock checksum on %pg\n",
1659 rdev->bdev);
1660 return -EINVAL;
1661 }
1662 if (le64_to_cpu(sb->data_size) < 10) {
1663 pr_warn("md: data_size too small on %pg\n",
1664 rdev->bdev);
1665 return -EINVAL;
1666 }
1667 if (sb->pad0 ||
1668 sb->pad3[0] ||
1669 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1670 /* Some padding is non-zero, might be a new feature */
1671 return -EINVAL;
1672
1673 rdev->preferred_minor = 0xffff;
1674 rdev->data_offset = le64_to_cpu(sb->data_offset);
1675 rdev->new_data_offset = rdev->data_offset;
1676 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1677 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1678 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1679 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1680
1681 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1682 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1683 if (rdev->sb_size & bmask)
1684 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1685
1686 if (minor_version
1687 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1688 return -EINVAL;
1689 if (minor_version
1690 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1691 return -EINVAL;
1692
1693 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1694 rdev->desc_nr = -1;
1695 else
1696 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1697
1698 if (!rdev->bb_page) {
1699 rdev->bb_page = alloc_page(GFP_KERNEL);
1700 if (!rdev->bb_page)
1701 return -ENOMEM;
1702 }
1703 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1704 rdev->badblocks.count == 0) {
1705 /* need to load the bad block list.
1706 * Currently we limit it to one page.
1707 */
1708 s32 offset;
1709 sector_t bb_sector;
1710 __le64 *bbp;
1711 int i;
1712 int sectors = le16_to_cpu(sb->bblog_size);
1713 if (sectors > (PAGE_SIZE / 512))
1714 return -EINVAL;
1715 offset = le32_to_cpu(sb->bblog_offset);
1716 if (offset == 0)
1717 return -EINVAL;
1718 bb_sector = (long long)offset;
1719 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1720 rdev->bb_page, REQ_OP_READ, true))
1721 return -EIO;
1722 bbp = (__le64 *)page_address(rdev->bb_page);
1723 rdev->badblocks.shift = sb->bblog_shift;
1724 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1725 u64 bb = le64_to_cpu(*bbp);
1726 int count = bb & (0x3ff);
1727 u64 sector = bb >> 10;
1728 sector <<= sb->bblog_shift;
1729 count <<= sb->bblog_shift;
1730 if (bb + 1 == 0)
1731 break;
1732 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1733 return -EINVAL;
1734 }
1735 } else if (sb->bblog_offset != 0)
1736 rdev->badblocks.shift = 0;
1737
1738 if ((le32_to_cpu(sb->feature_map) &
1739 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
1740 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
1741 rdev->ppl.size = le16_to_cpu(sb->ppl.size);
1742 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
1743 }
1744
1745 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) &&
1746 sb->level != 0)
1747 return -EINVAL;
1748
1749 /* not spare disk, or LEVEL_MULTIPATH */
1750 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH) ||
1751 (rdev->desc_nr >= 0 &&
1752 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1753 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1754 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)))
1755 spare_disk = false;
1756
1757 if (!refdev) {
1758 if (!spare_disk)
1759 ret = 1;
1760 else
1761 ret = 0;
1762 } else {
1763 __u64 ev1, ev2;
1764 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1765
1766 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1767 sb->level != refsb->level ||
1768 sb->layout != refsb->layout ||
1769 sb->chunksize != refsb->chunksize) {
1770 pr_warn("md: %pg has strangely different superblock to %pg\n",
1771 rdev->bdev,
1772 refdev->bdev);
1773 return -EINVAL;
1774 }
1775 ev1 = le64_to_cpu(sb->events);
1776 ev2 = le64_to_cpu(refsb->events);
1777
1778 if (!spare_disk && ev1 > ev2)
1779 ret = 1;
1780 else
1781 ret = 0;
1782 }
1783 if (minor_version)
1784 sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
1785 else
1786 sectors = rdev->sb_start;
1787 if (sectors < le64_to_cpu(sb->data_size))
1788 return -EINVAL;
1789 rdev->sectors = le64_to_cpu(sb->data_size);
1790 return ret;
1791 }
1792
super_1_validate(struct mddev * mddev,struct md_rdev * freshest,struct md_rdev * rdev)1793 static int super_1_validate(struct mddev *mddev, struct md_rdev *freshest, struct md_rdev *rdev)
1794 {
1795 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1796 __u64 ev1 = le64_to_cpu(sb->events);
1797
1798 rdev->raid_disk = -1;
1799 clear_bit(Faulty, &rdev->flags);
1800 clear_bit(In_sync, &rdev->flags);
1801 clear_bit(Bitmap_sync, &rdev->flags);
1802 clear_bit(WriteMostly, &rdev->flags);
1803
1804 if (mddev->raid_disks == 0) {
1805 mddev->major_version = 1;
1806 mddev->patch_version = 0;
1807 mddev->external = 0;
1808 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1809 mddev->ctime = le64_to_cpu(sb->ctime);
1810 mddev->utime = le64_to_cpu(sb->utime);
1811 mddev->level = le32_to_cpu(sb->level);
1812 mddev->clevel[0] = 0;
1813 mddev->layout = le32_to_cpu(sb->layout);
1814 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1815 mddev->dev_sectors = le64_to_cpu(sb->size);
1816 mddev->events = ev1;
1817 mddev->bitmap_info.offset = 0;
1818 mddev->bitmap_info.space = 0;
1819 /* Default location for bitmap is 1K after superblock
1820 * using 3K - total of 4K
1821 */
1822 mddev->bitmap_info.default_offset = 1024 >> 9;
1823 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1824 mddev->reshape_backwards = 0;
1825
1826 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1827 memcpy(mddev->uuid, sb->set_uuid, 16);
1828
1829 mddev->max_disks = (4096-256)/2;
1830
1831 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1832 mddev->bitmap_info.file == NULL) {
1833 mddev->bitmap_info.offset =
1834 (__s32)le32_to_cpu(sb->bitmap_offset);
1835 /* Metadata doesn't record how much space is available.
1836 * For 1.0, we assume we can use up to the superblock
1837 * if before, else to 4K beyond superblock.
1838 * For others, assume no change is possible.
1839 */
1840 if (mddev->minor_version > 0)
1841 mddev->bitmap_info.space = 0;
1842 else if (mddev->bitmap_info.offset > 0)
1843 mddev->bitmap_info.space =
1844 8 - mddev->bitmap_info.offset;
1845 else
1846 mddev->bitmap_info.space =
1847 -mddev->bitmap_info.offset;
1848 }
1849
1850 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1851 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1852 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1853 mddev->new_level = le32_to_cpu(sb->new_level);
1854 mddev->new_layout = le32_to_cpu(sb->new_layout);
1855 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1856 if (mddev->delta_disks < 0 ||
1857 (mddev->delta_disks == 0 &&
1858 (le32_to_cpu(sb->feature_map)
1859 & MD_FEATURE_RESHAPE_BACKWARDS)))
1860 mddev->reshape_backwards = 1;
1861 } else {
1862 mddev->reshape_position = MaxSector;
1863 mddev->delta_disks = 0;
1864 mddev->new_level = mddev->level;
1865 mddev->new_layout = mddev->layout;
1866 mddev->new_chunk_sectors = mddev->chunk_sectors;
1867 }
1868
1869 if (mddev->level == 0 &&
1870 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT))
1871 mddev->layout = -1;
1872
1873 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1874 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1875
1876 if (le32_to_cpu(sb->feature_map) &
1877 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1878 if (le32_to_cpu(sb->feature_map) &
1879 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1880 return -EINVAL;
1881 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1882 (le32_to_cpu(sb->feature_map) &
1883 MD_FEATURE_MULTIPLE_PPLS))
1884 return -EINVAL;
1885 set_bit(MD_HAS_PPL, &mddev->flags);
1886 }
1887 } else if (mddev->pers == NULL) {
1888 /* Insist of good event counter while assembling, except for
1889 * spares (which don't need an event count).
1890 * Similar to mdadm, we allow event counter difference of 1
1891 * from the freshest device.
1892 */
1893 if (rdev->desc_nr >= 0 &&
1894 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1895 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1896 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1897 if (ev1 + 1 < mddev->events)
1898 return -EINVAL;
1899 } else if (mddev->bitmap) {
1900 /* If adding to array with a bitmap, then we can accept an
1901 * older device, but not too old.
1902 */
1903 if (ev1 < mddev->bitmap->events_cleared)
1904 return 0;
1905 if (ev1 < mddev->events)
1906 set_bit(Bitmap_sync, &rdev->flags);
1907 } else {
1908 if (ev1 < mddev->events)
1909 /* just a hot-add of a new device, leave raid_disk at -1 */
1910 return 0;
1911 }
1912 if (mddev->level != LEVEL_MULTIPATH) {
1913 int role;
1914 if (rdev->desc_nr < 0 ||
1915 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1916 role = MD_DISK_ROLE_SPARE;
1917 rdev->desc_nr = -1;
1918 } else if (mddev->pers == NULL && freshest && ev1 < mddev->events) {
1919 /*
1920 * If we are assembling, and our event counter is smaller than the
1921 * highest event counter, we cannot trust our superblock about the role.
1922 * It could happen that our rdev was marked as Faulty, and all other
1923 * superblocks were updated with +1 event counter.
1924 * Then, before the next superblock update, which typically happens when
1925 * remove_and_add_spares() removes the device from the array, there was
1926 * a crash or reboot.
1927 * If we allow current rdev without consulting the freshest superblock,
1928 * we could cause data corruption.
1929 * Note that in this case our event counter is smaller by 1 than the
1930 * highest, otherwise, this rdev would not be allowed into array;
1931 * both kernel and mdadm allow event counter difference of 1.
1932 */
1933 struct mdp_superblock_1 *freshest_sb = page_address(freshest->sb_page);
1934 u32 freshest_max_dev = le32_to_cpu(freshest_sb->max_dev);
1935
1936 if (rdev->desc_nr >= freshest_max_dev) {
1937 /* this is unexpected, better not proceed */
1938 pr_warn("md: %s: rdev[%pg]: desc_nr(%d) >= freshest(%pg)->sb->max_dev(%u)\n",
1939 mdname(mddev), rdev->bdev, rdev->desc_nr,
1940 freshest->bdev, freshest_max_dev);
1941 return -EUCLEAN;
1942 }
1943
1944 role = le16_to_cpu(freshest_sb->dev_roles[rdev->desc_nr]);
1945 pr_debug("md: %s: rdev[%pg]: role=%d(0x%x) according to freshest %pg\n",
1946 mdname(mddev), rdev->bdev, role, role, freshest->bdev);
1947 } else {
1948 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1949 }
1950 switch(role) {
1951 case MD_DISK_ROLE_SPARE: /* spare */
1952 break;
1953 case MD_DISK_ROLE_FAULTY: /* faulty */
1954 set_bit(Faulty, &rdev->flags);
1955 break;
1956 case MD_DISK_ROLE_JOURNAL: /* journal device */
1957 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1958 /* journal device without journal feature */
1959 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1960 return -EINVAL;
1961 }
1962 set_bit(Journal, &rdev->flags);
1963 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1964 rdev->raid_disk = 0;
1965 break;
1966 default:
1967 rdev->saved_raid_disk = role;
1968 if ((le32_to_cpu(sb->feature_map) &
1969 MD_FEATURE_RECOVERY_OFFSET)) {
1970 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1971 if (!(le32_to_cpu(sb->feature_map) &
1972 MD_FEATURE_RECOVERY_BITMAP))
1973 rdev->saved_raid_disk = -1;
1974 } else {
1975 /*
1976 * If the array is FROZEN, then the device can't
1977 * be in_sync with rest of array.
1978 */
1979 if (!test_bit(MD_RECOVERY_FROZEN,
1980 &mddev->recovery))
1981 set_bit(In_sync, &rdev->flags);
1982 }
1983 rdev->raid_disk = role;
1984 break;
1985 }
1986 if (sb->devflags & WriteMostly1)
1987 set_bit(WriteMostly, &rdev->flags);
1988 if (sb->devflags & FailFast1)
1989 set_bit(FailFast, &rdev->flags);
1990 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1991 set_bit(Replacement, &rdev->flags);
1992 } else /* MULTIPATH are always insync */
1993 set_bit(In_sync, &rdev->flags);
1994
1995 return 0;
1996 }
1997
super_1_sync(struct mddev * mddev,struct md_rdev * rdev)1998 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1999 {
2000 struct mdp_superblock_1 *sb;
2001 struct md_rdev *rdev2;
2002 int max_dev, i;
2003 /* make rdev->sb match mddev and rdev data. */
2004
2005 sb = page_address(rdev->sb_page);
2006
2007 sb->feature_map = 0;
2008 sb->pad0 = 0;
2009 sb->recovery_offset = cpu_to_le64(0);
2010 memset(sb->pad3, 0, sizeof(sb->pad3));
2011
2012 sb->utime = cpu_to_le64((__u64)mddev->utime);
2013 sb->events = cpu_to_le64(mddev->events);
2014 if (mddev->in_sync)
2015 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
2016 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
2017 sb->resync_offset = cpu_to_le64(MaxSector);
2018 else
2019 sb->resync_offset = cpu_to_le64(0);
2020
2021 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
2022
2023 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
2024 sb->size = cpu_to_le64(mddev->dev_sectors);
2025 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
2026 sb->level = cpu_to_le32(mddev->level);
2027 sb->layout = cpu_to_le32(mddev->layout);
2028 if (test_bit(FailFast, &rdev->flags))
2029 sb->devflags |= FailFast1;
2030 else
2031 sb->devflags &= ~FailFast1;
2032
2033 if (test_bit(WriteMostly, &rdev->flags))
2034 sb->devflags |= WriteMostly1;
2035 else
2036 sb->devflags &= ~WriteMostly1;
2037 sb->data_offset = cpu_to_le64(rdev->data_offset);
2038 sb->data_size = cpu_to_le64(rdev->sectors);
2039
2040 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
2041 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
2042 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
2043 }
2044
2045 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
2046 !test_bit(In_sync, &rdev->flags)) {
2047 sb->feature_map |=
2048 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
2049 sb->recovery_offset =
2050 cpu_to_le64(rdev->recovery_offset);
2051 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
2052 sb->feature_map |=
2053 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
2054 }
2055 /* Note: recovery_offset and journal_tail share space */
2056 if (test_bit(Journal, &rdev->flags))
2057 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
2058 if (test_bit(Replacement, &rdev->flags))
2059 sb->feature_map |=
2060 cpu_to_le32(MD_FEATURE_REPLACEMENT);
2061
2062 if (mddev->reshape_position != MaxSector) {
2063 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
2064 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
2065 sb->new_layout = cpu_to_le32(mddev->new_layout);
2066 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
2067 sb->new_level = cpu_to_le32(mddev->new_level);
2068 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
2069 if (mddev->delta_disks == 0 &&
2070 mddev->reshape_backwards)
2071 sb->feature_map
2072 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
2073 if (rdev->new_data_offset != rdev->data_offset) {
2074 sb->feature_map
2075 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
2076 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
2077 - rdev->data_offset));
2078 }
2079 }
2080
2081 if (mddev_is_clustered(mddev))
2082 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
2083
2084 if (rdev->badblocks.count == 0)
2085 /* Nothing to do for bad blocks*/ ;
2086 else if (sb->bblog_offset == 0)
2087 /* Cannot record bad blocks on this device */
2088 md_error(mddev, rdev);
2089 else {
2090 struct badblocks *bb = &rdev->badblocks;
2091 __le64 *bbp = (__le64 *)page_address(rdev->bb_page);
2092 u64 *p = bb->page;
2093 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
2094 if (bb->changed) {
2095 unsigned seq;
2096
2097 retry:
2098 seq = read_seqbegin(&bb->lock);
2099
2100 memset(bbp, 0xff, PAGE_SIZE);
2101
2102 for (i = 0 ; i < bb->count ; i++) {
2103 u64 internal_bb = p[i];
2104 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
2105 | BB_LEN(internal_bb));
2106 bbp[i] = cpu_to_le64(store_bb);
2107 }
2108 bb->changed = 0;
2109 if (read_seqretry(&bb->lock, seq))
2110 goto retry;
2111
2112 bb->sector = (rdev->sb_start +
2113 (int)le32_to_cpu(sb->bblog_offset));
2114 bb->size = le16_to_cpu(sb->bblog_size);
2115 }
2116 }
2117
2118 max_dev = 0;
2119 rdev_for_each(rdev2, mddev)
2120 if (rdev2->desc_nr+1 > max_dev)
2121 max_dev = rdev2->desc_nr+1;
2122
2123 if (max_dev > le32_to_cpu(sb->max_dev)) {
2124 int bmask;
2125 sb->max_dev = cpu_to_le32(max_dev);
2126 rdev->sb_size = max_dev * 2 + 256;
2127 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
2128 if (rdev->sb_size & bmask)
2129 rdev->sb_size = (rdev->sb_size | bmask) + 1;
2130 } else
2131 max_dev = le32_to_cpu(sb->max_dev);
2132
2133 for (i=0; i<max_dev;i++)
2134 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2135
2136 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
2137 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
2138
2139 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
2140 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
2141 sb->feature_map |=
2142 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
2143 else
2144 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
2145 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
2146 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
2147 }
2148
2149 rdev_for_each(rdev2, mddev) {
2150 i = rdev2->desc_nr;
2151 if (test_bit(Faulty, &rdev2->flags))
2152 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
2153 else if (test_bit(In_sync, &rdev2->flags))
2154 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2155 else if (test_bit(Journal, &rdev2->flags))
2156 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
2157 else if (rdev2->raid_disk >= 0)
2158 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2159 else
2160 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2161 }
2162
2163 sb->sb_csum = calc_sb_1_csum(sb);
2164 }
2165
super_1_choose_bm_space(sector_t dev_size)2166 static sector_t super_1_choose_bm_space(sector_t dev_size)
2167 {
2168 sector_t bm_space;
2169
2170 /* if the device is bigger than 8Gig, save 64k for bitmap
2171 * usage, if bigger than 200Gig, save 128k
2172 */
2173 if (dev_size < 64*2)
2174 bm_space = 0;
2175 else if (dev_size - 64*2 >= 200*1024*1024*2)
2176 bm_space = 128*2;
2177 else if (dev_size - 4*2 > 8*1024*1024*2)
2178 bm_space = 64*2;
2179 else
2180 bm_space = 4*2;
2181 return bm_space;
2182 }
2183
2184 static unsigned long long
super_1_rdev_size_change(struct md_rdev * rdev,sector_t num_sectors)2185 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
2186 {
2187 struct mdp_superblock_1 *sb;
2188 sector_t max_sectors;
2189 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
2190 return 0; /* component must fit device */
2191 if (rdev->data_offset != rdev->new_data_offset)
2192 return 0; /* too confusing */
2193 if (rdev->sb_start < rdev->data_offset) {
2194 /* minor versions 1 and 2; superblock before data */
2195 max_sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
2196 if (!num_sectors || num_sectors > max_sectors)
2197 num_sectors = max_sectors;
2198 } else if (rdev->mddev->bitmap_info.offset) {
2199 /* minor version 0 with bitmap we can't move */
2200 return 0;
2201 } else {
2202 /* minor version 0; superblock after data */
2203 sector_t sb_start, bm_space;
2204 sector_t dev_size = bdev_nr_sectors(rdev->bdev);
2205
2206 /* 8K is for superblock */
2207 sb_start = dev_size - 8*2;
2208 sb_start &= ~(sector_t)(4*2 - 1);
2209
2210 bm_space = super_1_choose_bm_space(dev_size);
2211
2212 /* Space that can be used to store date needs to decrease
2213 * superblock bitmap space and bad block space(4K)
2214 */
2215 max_sectors = sb_start - bm_space - 4*2;
2216
2217 if (!num_sectors || num_sectors > max_sectors)
2218 num_sectors = max_sectors;
2219 rdev->sb_start = sb_start;
2220 }
2221 sb = page_address(rdev->sb_page);
2222 sb->data_size = cpu_to_le64(num_sectors);
2223 sb->super_offset = cpu_to_le64(rdev->sb_start);
2224 sb->sb_csum = calc_sb_1_csum(sb);
2225 do {
2226 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
2227 rdev->sb_page);
2228 } while (md_super_wait(rdev->mddev) < 0);
2229 return num_sectors;
2230
2231 }
2232
2233 static int
super_1_allow_new_offset(struct md_rdev * rdev,unsigned long long new_offset)2234 super_1_allow_new_offset(struct md_rdev *rdev,
2235 unsigned long long new_offset)
2236 {
2237 /* All necessary checks on new >= old have been done */
2238 struct bitmap *bitmap;
2239 if (new_offset >= rdev->data_offset)
2240 return 1;
2241
2242 /* with 1.0 metadata, there is no metadata to tread on
2243 * so we can always move back */
2244 if (rdev->mddev->minor_version == 0)
2245 return 1;
2246
2247 /* otherwise we must be sure not to step on
2248 * any metadata, so stay:
2249 * 36K beyond start of superblock
2250 * beyond end of badblocks
2251 * beyond write-intent bitmap
2252 */
2253 if (rdev->sb_start + (32+4)*2 > new_offset)
2254 return 0;
2255 bitmap = rdev->mddev->bitmap;
2256 if (bitmap && !rdev->mddev->bitmap_info.file &&
2257 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2258 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2259 return 0;
2260 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2261 return 0;
2262
2263 return 1;
2264 }
2265
2266 static struct super_type super_types[] = {
2267 [0] = {
2268 .name = "0.90.0",
2269 .owner = THIS_MODULE,
2270 .load_super = super_90_load,
2271 .validate_super = super_90_validate,
2272 .sync_super = super_90_sync,
2273 .rdev_size_change = super_90_rdev_size_change,
2274 .allow_new_offset = super_90_allow_new_offset,
2275 },
2276 [1] = {
2277 .name = "md-1",
2278 .owner = THIS_MODULE,
2279 .load_super = super_1_load,
2280 .validate_super = super_1_validate,
2281 .sync_super = super_1_sync,
2282 .rdev_size_change = super_1_rdev_size_change,
2283 .allow_new_offset = super_1_allow_new_offset,
2284 },
2285 };
2286
sync_super(struct mddev * mddev,struct md_rdev * rdev)2287 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2288 {
2289 if (mddev->sync_super) {
2290 mddev->sync_super(mddev, rdev);
2291 return;
2292 }
2293
2294 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2295
2296 super_types[mddev->major_version].sync_super(mddev, rdev);
2297 }
2298
match_mddev_units(struct mddev * mddev1,struct mddev * mddev2)2299 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2300 {
2301 struct md_rdev *rdev, *rdev2;
2302
2303 rcu_read_lock();
2304 rdev_for_each_rcu(rdev, mddev1) {
2305 if (test_bit(Faulty, &rdev->flags) ||
2306 test_bit(Journal, &rdev->flags) ||
2307 rdev->raid_disk == -1)
2308 continue;
2309 rdev_for_each_rcu(rdev2, mddev2) {
2310 if (test_bit(Faulty, &rdev2->flags) ||
2311 test_bit(Journal, &rdev2->flags) ||
2312 rdev2->raid_disk == -1)
2313 continue;
2314 if (rdev->bdev->bd_disk == rdev2->bdev->bd_disk) {
2315 rcu_read_unlock();
2316 return 1;
2317 }
2318 }
2319 }
2320 rcu_read_unlock();
2321 return 0;
2322 }
2323
2324 static LIST_HEAD(pending_raid_disks);
2325
2326 /*
2327 * Try to register data integrity profile for an mddev
2328 *
2329 * This is called when an array is started and after a disk has been kicked
2330 * from the array. It only succeeds if all working and active component devices
2331 * are integrity capable with matching profiles.
2332 */
md_integrity_register(struct mddev * mddev)2333 int md_integrity_register(struct mddev *mddev)
2334 {
2335 struct md_rdev *rdev, *reference = NULL;
2336
2337 if (list_empty(&mddev->disks))
2338 return 0; /* nothing to do */
2339 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2340 return 0; /* shouldn't register, or already is */
2341 rdev_for_each(rdev, mddev) {
2342 /* skip spares and non-functional disks */
2343 if (test_bit(Faulty, &rdev->flags))
2344 continue;
2345 if (rdev->raid_disk < 0)
2346 continue;
2347 if (!reference) {
2348 /* Use the first rdev as the reference */
2349 reference = rdev;
2350 continue;
2351 }
2352 /* does this rdev's profile match the reference profile? */
2353 if (blk_integrity_compare(reference->bdev->bd_disk,
2354 rdev->bdev->bd_disk) < 0)
2355 return -EINVAL;
2356 }
2357 if (!reference || !bdev_get_integrity(reference->bdev))
2358 return 0;
2359 /*
2360 * All component devices are integrity capable and have matching
2361 * profiles, register the common profile for the md device.
2362 */
2363 blk_integrity_register(mddev->gendisk,
2364 bdev_get_integrity(reference->bdev));
2365
2366 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2367 if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE) ||
2368 (mddev->level != 1 && mddev->level != 10 &&
2369 bioset_integrity_create(&mddev->io_clone_set, BIO_POOL_SIZE))) {
2370 /*
2371 * No need to handle the failure of bioset_integrity_create,
2372 * because the function is called by md_run() -> pers->run(),
2373 * md_run calls bioset_exit -> bioset_integrity_free in case
2374 * of failure case.
2375 */
2376 pr_err("md: failed to create integrity pool for %s\n",
2377 mdname(mddev));
2378 return -EINVAL;
2379 }
2380 return 0;
2381 }
2382 EXPORT_SYMBOL(md_integrity_register);
2383
2384 /*
2385 * Attempt to add an rdev, but only if it is consistent with the current
2386 * integrity profile
2387 */
md_integrity_add_rdev(struct md_rdev * rdev,struct mddev * mddev)2388 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2389 {
2390 struct blk_integrity *bi_mddev;
2391
2392 if (!mddev->gendisk)
2393 return 0;
2394
2395 bi_mddev = blk_get_integrity(mddev->gendisk);
2396
2397 if (!bi_mddev) /* nothing to do */
2398 return 0;
2399
2400 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2401 pr_err("%s: incompatible integrity profile for %pg\n",
2402 mdname(mddev), rdev->bdev);
2403 return -ENXIO;
2404 }
2405
2406 return 0;
2407 }
2408 EXPORT_SYMBOL(md_integrity_add_rdev);
2409
rdev_read_only(struct md_rdev * rdev)2410 static bool rdev_read_only(struct md_rdev *rdev)
2411 {
2412 return bdev_read_only(rdev->bdev) ||
2413 (rdev->meta_bdev && bdev_read_only(rdev->meta_bdev));
2414 }
2415
bind_rdev_to_array(struct md_rdev * rdev,struct mddev * mddev)2416 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2417 {
2418 char b[BDEVNAME_SIZE];
2419 int err;
2420
2421 /* prevent duplicates */
2422 if (find_rdev(mddev, rdev->bdev->bd_dev))
2423 return -EEXIST;
2424
2425 if (rdev_read_only(rdev) && mddev->pers)
2426 return -EROFS;
2427
2428 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2429 if (!test_bit(Journal, &rdev->flags) &&
2430 rdev->sectors &&
2431 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2432 if (mddev->pers) {
2433 /* Cannot change size, so fail
2434 * If mddev->level <= 0, then we don't care
2435 * about aligning sizes (e.g. linear)
2436 */
2437 if (mddev->level > 0)
2438 return -ENOSPC;
2439 } else
2440 mddev->dev_sectors = rdev->sectors;
2441 }
2442
2443 /* Verify rdev->desc_nr is unique.
2444 * If it is -1, assign a free number, else
2445 * check number is not in use
2446 */
2447 rcu_read_lock();
2448 if (rdev->desc_nr < 0) {
2449 int choice = 0;
2450 if (mddev->pers)
2451 choice = mddev->raid_disks;
2452 while (md_find_rdev_nr_rcu(mddev, choice))
2453 choice++;
2454 rdev->desc_nr = choice;
2455 } else {
2456 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2457 rcu_read_unlock();
2458 return -EBUSY;
2459 }
2460 }
2461 rcu_read_unlock();
2462 if (!test_bit(Journal, &rdev->flags) &&
2463 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2464 pr_warn("md: %s: array is limited to %d devices\n",
2465 mdname(mddev), mddev->max_disks);
2466 return -EBUSY;
2467 }
2468 snprintf(b, sizeof(b), "%pg", rdev->bdev);
2469 strreplace(b, '/', '!');
2470
2471 rdev->mddev = mddev;
2472 pr_debug("md: bind<%s>\n", b);
2473
2474 if (mddev->raid_disks)
2475 mddev_create_serial_pool(mddev, rdev, false);
2476
2477 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2478 goto fail;
2479
2480 /* failure here is OK */
2481 err = sysfs_create_link(&rdev->kobj, bdev_kobj(rdev->bdev), "block");
2482 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2483 rdev->sysfs_unack_badblocks =
2484 sysfs_get_dirent_safe(rdev->kobj.sd, "unacknowledged_bad_blocks");
2485 rdev->sysfs_badblocks =
2486 sysfs_get_dirent_safe(rdev->kobj.sd, "bad_blocks");
2487
2488 list_add_rcu(&rdev->same_set, &mddev->disks);
2489 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2490
2491 /* May as well allow recovery to be retried once */
2492 mddev->recovery_disabled++;
2493
2494 return 0;
2495
2496 fail:
2497 pr_warn("md: failed to register dev-%s for %s\n",
2498 b, mdname(mddev));
2499 mddev_destroy_serial_pool(mddev, rdev, false);
2500 return err;
2501 }
2502
2503 void md_autodetect_dev(dev_t dev);
2504
2505 /* just for claiming the bdev */
2506 static struct md_rdev claim_rdev;
2507
export_rdev(struct md_rdev * rdev,struct mddev * mddev)2508 static void export_rdev(struct md_rdev *rdev, struct mddev *mddev)
2509 {
2510 pr_debug("md: export_rdev(%pg)\n", rdev->bdev);
2511 md_rdev_clear(rdev);
2512 #ifndef MODULE
2513 if (test_bit(AutoDetected, &rdev->flags))
2514 md_autodetect_dev(rdev->bdev->bd_dev);
2515 #endif
2516 blkdev_put(rdev->bdev,
2517 test_bit(Holder, &rdev->flags) ? rdev : &claim_rdev);
2518 rdev->bdev = NULL;
2519 kobject_put(&rdev->kobj);
2520 }
2521
md_kick_rdev_from_array(struct md_rdev * rdev)2522 static void md_kick_rdev_from_array(struct md_rdev *rdev)
2523 {
2524 struct mddev *mddev = rdev->mddev;
2525
2526 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2527 list_del_rcu(&rdev->same_set);
2528 pr_debug("md: unbind<%pg>\n", rdev->bdev);
2529 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
2530 rdev->mddev = NULL;
2531 sysfs_remove_link(&rdev->kobj, "block");
2532 sysfs_put(rdev->sysfs_state);
2533 sysfs_put(rdev->sysfs_unack_badblocks);
2534 sysfs_put(rdev->sysfs_badblocks);
2535 rdev->sysfs_state = NULL;
2536 rdev->sysfs_unack_badblocks = NULL;
2537 rdev->sysfs_badblocks = NULL;
2538 rdev->badblocks.count = 0;
2539
2540 synchronize_rcu();
2541
2542 /*
2543 * kobject_del() will wait for all in progress writers to be done, where
2544 * reconfig_mutex is held, hence it can't be called under
2545 * reconfig_mutex and it's delayed to mddev_unlock().
2546 */
2547 list_add(&rdev->same_set, &mddev->deleting);
2548 }
2549
export_array(struct mddev * mddev)2550 static void export_array(struct mddev *mddev)
2551 {
2552 struct md_rdev *rdev;
2553
2554 while (!list_empty(&mddev->disks)) {
2555 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2556 same_set);
2557 md_kick_rdev_from_array(rdev);
2558 }
2559 mddev->raid_disks = 0;
2560 mddev->major_version = 0;
2561 }
2562
set_in_sync(struct mddev * mddev)2563 static bool set_in_sync(struct mddev *mddev)
2564 {
2565 lockdep_assert_held(&mddev->lock);
2566 if (!mddev->in_sync) {
2567 mddev->sync_checkers++;
2568 spin_unlock(&mddev->lock);
2569 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2570 spin_lock(&mddev->lock);
2571 if (!mddev->in_sync &&
2572 percpu_ref_is_zero(&mddev->writes_pending)) {
2573 mddev->in_sync = 1;
2574 /*
2575 * Ensure ->in_sync is visible before we clear
2576 * ->sync_checkers.
2577 */
2578 smp_mb();
2579 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2580 sysfs_notify_dirent_safe(mddev->sysfs_state);
2581 }
2582 if (--mddev->sync_checkers == 0)
2583 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2584 }
2585 if (mddev->safemode == 1)
2586 mddev->safemode = 0;
2587 return mddev->in_sync;
2588 }
2589
sync_sbs(struct mddev * mddev,int nospares)2590 static void sync_sbs(struct mddev *mddev, int nospares)
2591 {
2592 /* Update each superblock (in-memory image), but
2593 * if we are allowed to, skip spares which already
2594 * have the right event counter, or have one earlier
2595 * (which would mean they aren't being marked as dirty
2596 * with the rest of the array)
2597 */
2598 struct md_rdev *rdev;
2599 rdev_for_each(rdev, mddev) {
2600 if (rdev->sb_events == mddev->events ||
2601 (nospares &&
2602 rdev->raid_disk < 0 &&
2603 rdev->sb_events+1 == mddev->events)) {
2604 /* Don't update this superblock */
2605 rdev->sb_loaded = 2;
2606 } else {
2607 sync_super(mddev, rdev);
2608 rdev->sb_loaded = 1;
2609 }
2610 }
2611 }
2612
does_sb_need_changing(struct mddev * mddev)2613 static bool does_sb_need_changing(struct mddev *mddev)
2614 {
2615 struct md_rdev *rdev = NULL, *iter;
2616 struct mdp_superblock_1 *sb;
2617 int role;
2618
2619 /* Find a good rdev */
2620 rdev_for_each(iter, mddev)
2621 if ((iter->raid_disk >= 0) && !test_bit(Faulty, &iter->flags)) {
2622 rdev = iter;
2623 break;
2624 }
2625
2626 /* No good device found. */
2627 if (!rdev)
2628 return false;
2629
2630 sb = page_address(rdev->sb_page);
2631 /* Check if a device has become faulty or a spare become active */
2632 rdev_for_each(rdev, mddev) {
2633 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2634 /* Device activated? */
2635 if (role == MD_DISK_ROLE_SPARE && rdev->raid_disk >= 0 &&
2636 !test_bit(Faulty, &rdev->flags))
2637 return true;
2638 /* Device turned faulty? */
2639 if (test_bit(Faulty, &rdev->flags) && (role < MD_DISK_ROLE_MAX))
2640 return true;
2641 }
2642
2643 /* Check if any mddev parameters have changed */
2644 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2645 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2646 (mddev->layout != le32_to_cpu(sb->layout)) ||
2647 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2648 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2649 return true;
2650
2651 return false;
2652 }
2653
md_update_sb(struct mddev * mddev,int force_change)2654 void md_update_sb(struct mddev *mddev, int force_change)
2655 {
2656 struct md_rdev *rdev;
2657 int sync_req;
2658 int nospares = 0;
2659 int any_badblocks_changed = 0;
2660 int ret = -1;
2661
2662 if (!md_is_rdwr(mddev)) {
2663 if (force_change)
2664 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2665 return;
2666 }
2667
2668 repeat:
2669 if (mddev_is_clustered(mddev)) {
2670 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2671 force_change = 1;
2672 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2673 nospares = 1;
2674 ret = md_cluster_ops->metadata_update_start(mddev);
2675 /* Has someone else has updated the sb */
2676 if (!does_sb_need_changing(mddev)) {
2677 if (ret == 0)
2678 md_cluster_ops->metadata_update_cancel(mddev);
2679 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2680 BIT(MD_SB_CHANGE_DEVS) |
2681 BIT(MD_SB_CHANGE_CLEAN));
2682 return;
2683 }
2684 }
2685
2686 /*
2687 * First make sure individual recovery_offsets are correct
2688 * curr_resync_completed can only be used during recovery.
2689 * During reshape/resync it might use array-addresses rather
2690 * that device addresses.
2691 */
2692 rdev_for_each(rdev, mddev) {
2693 if (rdev->raid_disk >= 0 &&
2694 mddev->delta_disks >= 0 &&
2695 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
2696 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
2697 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
2698 !test_bit(Journal, &rdev->flags) &&
2699 !test_bit(In_sync, &rdev->flags) &&
2700 mddev->curr_resync_completed > rdev->recovery_offset)
2701 rdev->recovery_offset = mddev->curr_resync_completed;
2702
2703 }
2704 if (!mddev->persistent) {
2705 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2706 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2707 if (!mddev->external) {
2708 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2709 rdev_for_each(rdev, mddev) {
2710 if (rdev->badblocks.changed) {
2711 rdev->badblocks.changed = 0;
2712 ack_all_badblocks(&rdev->badblocks);
2713 md_error(mddev, rdev);
2714 }
2715 clear_bit(Blocked, &rdev->flags);
2716 clear_bit(BlockedBadBlocks, &rdev->flags);
2717 wake_up(&rdev->blocked_wait);
2718 }
2719 }
2720 wake_up(&mddev->sb_wait);
2721 return;
2722 }
2723
2724 spin_lock(&mddev->lock);
2725
2726 mddev->utime = ktime_get_real_seconds();
2727
2728 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2729 force_change = 1;
2730 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2731 /* just a clean<-> dirty transition, possibly leave spares alone,
2732 * though if events isn't the right even/odd, we will have to do
2733 * spares after all
2734 */
2735 nospares = 1;
2736 if (force_change)
2737 nospares = 0;
2738 if (mddev->degraded)
2739 /* If the array is degraded, then skipping spares is both
2740 * dangerous and fairly pointless.
2741 * Dangerous because a device that was removed from the array
2742 * might have a event_count that still looks up-to-date,
2743 * so it can be re-added without a resync.
2744 * Pointless because if there are any spares to skip,
2745 * then a recovery will happen and soon that array won't
2746 * be degraded any more and the spare can go back to sleep then.
2747 */
2748 nospares = 0;
2749
2750 sync_req = mddev->in_sync;
2751
2752 /* If this is just a dirty<->clean transition, and the array is clean
2753 * and 'events' is odd, we can roll back to the previous clean state */
2754 if (nospares
2755 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2756 && mddev->can_decrease_events
2757 && mddev->events != 1) {
2758 mddev->events--;
2759 mddev->can_decrease_events = 0;
2760 } else {
2761 /* otherwise we have to go forward and ... */
2762 mddev->events ++;
2763 mddev->can_decrease_events = nospares;
2764 }
2765
2766 /*
2767 * This 64-bit counter should never wrap.
2768 * Either we are in around ~1 trillion A.C., assuming
2769 * 1 reboot per second, or we have a bug...
2770 */
2771 WARN_ON(mddev->events == 0);
2772
2773 rdev_for_each(rdev, mddev) {
2774 if (rdev->badblocks.changed)
2775 any_badblocks_changed++;
2776 if (test_bit(Faulty, &rdev->flags))
2777 set_bit(FaultRecorded, &rdev->flags);
2778 }
2779
2780 sync_sbs(mddev, nospares);
2781 spin_unlock(&mddev->lock);
2782
2783 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2784 mdname(mddev), mddev->in_sync);
2785
2786 if (mddev->queue)
2787 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2788 rewrite:
2789 md_bitmap_update_sb(mddev->bitmap);
2790 rdev_for_each(rdev, mddev) {
2791 if (rdev->sb_loaded != 1)
2792 continue; /* no noise on spare devices */
2793
2794 if (!test_bit(Faulty, &rdev->flags)) {
2795 md_super_write(mddev,rdev,
2796 rdev->sb_start, rdev->sb_size,
2797 rdev->sb_page);
2798 pr_debug("md: (write) %pg's sb offset: %llu\n",
2799 rdev->bdev,
2800 (unsigned long long)rdev->sb_start);
2801 rdev->sb_events = mddev->events;
2802 if (rdev->badblocks.size) {
2803 md_super_write(mddev, rdev,
2804 rdev->badblocks.sector,
2805 rdev->badblocks.size << 9,
2806 rdev->bb_page);
2807 rdev->badblocks.size = 0;
2808 }
2809
2810 } else
2811 pr_debug("md: %pg (skipping faulty)\n",
2812 rdev->bdev);
2813
2814 if (mddev->level == LEVEL_MULTIPATH)
2815 /* only need to write one superblock... */
2816 break;
2817 }
2818 if (md_super_wait(mddev) < 0)
2819 goto rewrite;
2820 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2821
2822 if (mddev_is_clustered(mddev) && ret == 0)
2823 md_cluster_ops->metadata_update_finish(mddev);
2824
2825 if (mddev->in_sync != sync_req ||
2826 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2827 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2828 /* have to write it out again */
2829 goto repeat;
2830 wake_up(&mddev->sb_wait);
2831 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2832 sysfs_notify_dirent_safe(mddev->sysfs_completed);
2833
2834 rdev_for_each(rdev, mddev) {
2835 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2836 clear_bit(Blocked, &rdev->flags);
2837
2838 if (any_badblocks_changed)
2839 ack_all_badblocks(&rdev->badblocks);
2840 clear_bit(BlockedBadBlocks, &rdev->flags);
2841 wake_up(&rdev->blocked_wait);
2842 }
2843 }
2844 EXPORT_SYMBOL(md_update_sb);
2845
add_bound_rdev(struct md_rdev * rdev)2846 static int add_bound_rdev(struct md_rdev *rdev)
2847 {
2848 struct mddev *mddev = rdev->mddev;
2849 int err = 0;
2850 bool add_journal = test_bit(Journal, &rdev->flags);
2851
2852 if (!mddev->pers->hot_remove_disk || add_journal) {
2853 /* If there is hot_add_disk but no hot_remove_disk
2854 * then added disks for geometry changes,
2855 * and should be added immediately.
2856 */
2857 super_types[mddev->major_version].
2858 validate_super(mddev, NULL/*freshest*/, rdev);
2859 if (add_journal)
2860 mddev_suspend(mddev);
2861 err = mddev->pers->hot_add_disk(mddev, rdev);
2862 if (add_journal)
2863 mddev_resume(mddev);
2864 if (err) {
2865 md_kick_rdev_from_array(rdev);
2866 return err;
2867 }
2868 }
2869 sysfs_notify_dirent_safe(rdev->sysfs_state);
2870
2871 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2872 if (mddev->degraded)
2873 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2874 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2875 md_new_event();
2876 md_wakeup_thread(mddev->thread);
2877 return 0;
2878 }
2879
2880 /* words written to sysfs files may, or may not, be \n terminated.
2881 * We want to accept with case. For this we use cmd_match.
2882 */
cmd_match(const char * cmd,const char * str)2883 static int cmd_match(const char *cmd, const char *str)
2884 {
2885 /* See if cmd, written into a sysfs file, matches
2886 * str. They must either be the same, or cmd can
2887 * have a trailing newline
2888 */
2889 while (*cmd && *str && *cmd == *str) {
2890 cmd++;
2891 str++;
2892 }
2893 if (*cmd == '\n')
2894 cmd++;
2895 if (*str || *cmd)
2896 return 0;
2897 return 1;
2898 }
2899
2900 struct rdev_sysfs_entry {
2901 struct attribute attr;
2902 ssize_t (*show)(struct md_rdev *, char *);
2903 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2904 };
2905
2906 static ssize_t
state_show(struct md_rdev * rdev,char * page)2907 state_show(struct md_rdev *rdev, char *page)
2908 {
2909 char *sep = ",";
2910 size_t len = 0;
2911 unsigned long flags = READ_ONCE(rdev->flags);
2912
2913 if (test_bit(Faulty, &flags) ||
2914 (!test_bit(ExternalBbl, &flags) &&
2915 rdev->badblocks.unacked_exist))
2916 len += sprintf(page+len, "faulty%s", sep);
2917 if (test_bit(In_sync, &flags))
2918 len += sprintf(page+len, "in_sync%s", sep);
2919 if (test_bit(Journal, &flags))
2920 len += sprintf(page+len, "journal%s", sep);
2921 if (test_bit(WriteMostly, &flags))
2922 len += sprintf(page+len, "write_mostly%s", sep);
2923 if (test_bit(Blocked, &flags) ||
2924 (rdev->badblocks.unacked_exist
2925 && !test_bit(Faulty, &flags)))
2926 len += sprintf(page+len, "blocked%s", sep);
2927 if (!test_bit(Faulty, &flags) &&
2928 !test_bit(Journal, &flags) &&
2929 !test_bit(In_sync, &flags))
2930 len += sprintf(page+len, "spare%s", sep);
2931 if (test_bit(WriteErrorSeen, &flags))
2932 len += sprintf(page+len, "write_error%s", sep);
2933 if (test_bit(WantReplacement, &flags))
2934 len += sprintf(page+len, "want_replacement%s", sep);
2935 if (test_bit(Replacement, &flags))
2936 len += sprintf(page+len, "replacement%s", sep);
2937 if (test_bit(ExternalBbl, &flags))
2938 len += sprintf(page+len, "external_bbl%s", sep);
2939 if (test_bit(FailFast, &flags))
2940 len += sprintf(page+len, "failfast%s", sep);
2941
2942 if (len)
2943 len -= strlen(sep);
2944
2945 return len+sprintf(page+len, "\n");
2946 }
2947
2948 static ssize_t
state_store(struct md_rdev * rdev,const char * buf,size_t len)2949 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2950 {
2951 /* can write
2952 * faulty - simulates an error
2953 * remove - disconnects the device
2954 * writemostly - sets write_mostly
2955 * -writemostly - clears write_mostly
2956 * blocked - sets the Blocked flags
2957 * -blocked - clears the Blocked and possibly simulates an error
2958 * insync - sets Insync providing device isn't active
2959 * -insync - clear Insync for a device with a slot assigned,
2960 * so that it gets rebuilt based on bitmap
2961 * write_error - sets WriteErrorSeen
2962 * -write_error - clears WriteErrorSeen
2963 * {,-}failfast - set/clear FailFast
2964 */
2965
2966 struct mddev *mddev = rdev->mddev;
2967 int err = -EINVAL;
2968 bool need_update_sb = false;
2969
2970 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2971 md_error(rdev->mddev, rdev);
2972
2973 if (test_bit(MD_BROKEN, &rdev->mddev->flags))
2974 err = -EBUSY;
2975 else
2976 err = 0;
2977 } else if (cmd_match(buf, "remove")) {
2978 if (rdev->mddev->pers) {
2979 clear_bit(Blocked, &rdev->flags);
2980 remove_and_add_spares(rdev->mddev, rdev);
2981 }
2982 if (rdev->raid_disk >= 0)
2983 err = -EBUSY;
2984 else {
2985 err = 0;
2986 if (mddev_is_clustered(mddev))
2987 err = md_cluster_ops->remove_disk(mddev, rdev);
2988
2989 if (err == 0) {
2990 md_kick_rdev_from_array(rdev);
2991 if (mddev->pers) {
2992 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2993 md_wakeup_thread(mddev->thread);
2994 }
2995 md_new_event();
2996 }
2997 }
2998 } else if (cmd_match(buf, "writemostly")) {
2999 set_bit(WriteMostly, &rdev->flags);
3000 mddev_create_serial_pool(rdev->mddev, rdev, false);
3001 need_update_sb = true;
3002 err = 0;
3003 } else if (cmd_match(buf, "-writemostly")) {
3004 mddev_destroy_serial_pool(rdev->mddev, rdev, false);
3005 clear_bit(WriteMostly, &rdev->flags);
3006 need_update_sb = true;
3007 err = 0;
3008 } else if (cmd_match(buf, "blocked")) {
3009 set_bit(Blocked, &rdev->flags);
3010 err = 0;
3011 } else if (cmd_match(buf, "-blocked")) {
3012 if (!test_bit(Faulty, &rdev->flags) &&
3013 !test_bit(ExternalBbl, &rdev->flags) &&
3014 rdev->badblocks.unacked_exist) {
3015 /* metadata handler doesn't understand badblocks,
3016 * so we need to fail the device
3017 */
3018 md_error(rdev->mddev, rdev);
3019 }
3020 clear_bit(Blocked, &rdev->flags);
3021 clear_bit(BlockedBadBlocks, &rdev->flags);
3022 wake_up(&rdev->blocked_wait);
3023 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3024 md_wakeup_thread(rdev->mddev->thread);
3025
3026 err = 0;
3027 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
3028 set_bit(In_sync, &rdev->flags);
3029 err = 0;
3030 } else if (cmd_match(buf, "failfast")) {
3031 set_bit(FailFast, &rdev->flags);
3032 need_update_sb = true;
3033 err = 0;
3034 } else if (cmd_match(buf, "-failfast")) {
3035 clear_bit(FailFast, &rdev->flags);
3036 need_update_sb = true;
3037 err = 0;
3038 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
3039 !test_bit(Journal, &rdev->flags)) {
3040 if (rdev->mddev->pers == NULL) {
3041 clear_bit(In_sync, &rdev->flags);
3042 rdev->saved_raid_disk = rdev->raid_disk;
3043 rdev->raid_disk = -1;
3044 err = 0;
3045 }
3046 } else if (cmd_match(buf, "write_error")) {
3047 set_bit(WriteErrorSeen, &rdev->flags);
3048 err = 0;
3049 } else if (cmd_match(buf, "-write_error")) {
3050 clear_bit(WriteErrorSeen, &rdev->flags);
3051 err = 0;
3052 } else if (cmd_match(buf, "want_replacement")) {
3053 /* Any non-spare device that is not a replacement can
3054 * become want_replacement at any time, but we then need to
3055 * check if recovery is needed.
3056 */
3057 if (rdev->raid_disk >= 0 &&
3058 !test_bit(Journal, &rdev->flags) &&
3059 !test_bit(Replacement, &rdev->flags))
3060 set_bit(WantReplacement, &rdev->flags);
3061 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3062 md_wakeup_thread(rdev->mddev->thread);
3063 err = 0;
3064 } else if (cmd_match(buf, "-want_replacement")) {
3065 /* Clearing 'want_replacement' is always allowed.
3066 * Once replacements starts it is too late though.
3067 */
3068 err = 0;
3069 clear_bit(WantReplacement, &rdev->flags);
3070 } else if (cmd_match(buf, "replacement")) {
3071 /* Can only set a device as a replacement when array has not
3072 * yet been started. Once running, replacement is automatic
3073 * from spares, or by assigning 'slot'.
3074 */
3075 if (rdev->mddev->pers)
3076 err = -EBUSY;
3077 else {
3078 set_bit(Replacement, &rdev->flags);
3079 err = 0;
3080 }
3081 } else if (cmd_match(buf, "-replacement")) {
3082 /* Similarly, can only clear Replacement before start */
3083 if (rdev->mddev->pers)
3084 err = -EBUSY;
3085 else {
3086 clear_bit(Replacement, &rdev->flags);
3087 err = 0;
3088 }
3089 } else if (cmd_match(buf, "re-add")) {
3090 if (!rdev->mddev->pers)
3091 err = -EINVAL;
3092 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
3093 rdev->saved_raid_disk >= 0) {
3094 /* clear_bit is performed _after_ all the devices
3095 * have their local Faulty bit cleared. If any writes
3096 * happen in the meantime in the local node, they
3097 * will land in the local bitmap, which will be synced
3098 * by this node eventually
3099 */
3100 if (!mddev_is_clustered(rdev->mddev) ||
3101 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
3102 clear_bit(Faulty, &rdev->flags);
3103 err = add_bound_rdev(rdev);
3104 }
3105 } else
3106 err = -EBUSY;
3107 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
3108 set_bit(ExternalBbl, &rdev->flags);
3109 rdev->badblocks.shift = 0;
3110 err = 0;
3111 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
3112 clear_bit(ExternalBbl, &rdev->flags);
3113 err = 0;
3114 }
3115 if (need_update_sb)
3116 md_update_sb(mddev, 1);
3117 if (!err)
3118 sysfs_notify_dirent_safe(rdev->sysfs_state);
3119 return err ? err : len;
3120 }
3121 static struct rdev_sysfs_entry rdev_state =
3122 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
3123
3124 static ssize_t
errors_show(struct md_rdev * rdev,char * page)3125 errors_show(struct md_rdev *rdev, char *page)
3126 {
3127 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
3128 }
3129
3130 static ssize_t
errors_store(struct md_rdev * rdev,const char * buf,size_t len)3131 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
3132 {
3133 unsigned int n;
3134 int rv;
3135
3136 rv = kstrtouint(buf, 10, &n);
3137 if (rv < 0)
3138 return rv;
3139 atomic_set(&rdev->corrected_errors, n);
3140 return len;
3141 }
3142 static struct rdev_sysfs_entry rdev_errors =
3143 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
3144
3145 static ssize_t
slot_show(struct md_rdev * rdev,char * page)3146 slot_show(struct md_rdev *rdev, char *page)
3147 {
3148 if (test_bit(Journal, &rdev->flags))
3149 return sprintf(page, "journal\n");
3150 else if (rdev->raid_disk < 0)
3151 return sprintf(page, "none\n");
3152 else
3153 return sprintf(page, "%d\n", rdev->raid_disk);
3154 }
3155
3156 static ssize_t
slot_store(struct md_rdev * rdev,const char * buf,size_t len)3157 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
3158 {
3159 int slot;
3160 int err;
3161
3162 if (test_bit(Journal, &rdev->flags))
3163 return -EBUSY;
3164 if (strncmp(buf, "none", 4)==0)
3165 slot = -1;
3166 else {
3167 err = kstrtouint(buf, 10, (unsigned int *)&slot);
3168 if (err < 0)
3169 return err;
3170 if (slot < 0)
3171 /* overflow */
3172 return -ENOSPC;
3173 }
3174 if (rdev->mddev->pers && slot == -1) {
3175 /* Setting 'slot' on an active array requires also
3176 * updating the 'rd%d' link, and communicating
3177 * with the personality with ->hot_*_disk.
3178 * For now we only support removing
3179 * failed/spare devices. This normally happens automatically,
3180 * but not when the metadata is externally managed.
3181 */
3182 if (rdev->raid_disk == -1)
3183 return -EEXIST;
3184 /* personality does all needed checks */
3185 if (rdev->mddev->pers->hot_remove_disk == NULL)
3186 return -EINVAL;
3187 clear_bit(Blocked, &rdev->flags);
3188 remove_and_add_spares(rdev->mddev, rdev);
3189 if (rdev->raid_disk >= 0)
3190 return -EBUSY;
3191 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3192 md_wakeup_thread(rdev->mddev->thread);
3193 } else if (rdev->mddev->pers) {
3194 /* Activating a spare .. or possibly reactivating
3195 * if we ever get bitmaps working here.
3196 */
3197 int err;
3198
3199 if (rdev->raid_disk != -1)
3200 return -EBUSY;
3201
3202 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
3203 return -EBUSY;
3204
3205 if (rdev->mddev->pers->hot_add_disk == NULL)
3206 return -EINVAL;
3207
3208 if (slot >= rdev->mddev->raid_disks &&
3209 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3210 return -ENOSPC;
3211
3212 rdev->raid_disk = slot;
3213 if (test_bit(In_sync, &rdev->flags))
3214 rdev->saved_raid_disk = slot;
3215 else
3216 rdev->saved_raid_disk = -1;
3217 clear_bit(In_sync, &rdev->flags);
3218 clear_bit(Bitmap_sync, &rdev->flags);
3219 err = rdev->mddev->pers->hot_add_disk(rdev->mddev, rdev);
3220 if (err) {
3221 rdev->raid_disk = -1;
3222 return err;
3223 } else
3224 sysfs_notify_dirent_safe(rdev->sysfs_state);
3225 /* failure here is OK */;
3226 sysfs_link_rdev(rdev->mddev, rdev);
3227 /* don't wakeup anyone, leave that to userspace. */
3228 } else {
3229 if (slot >= rdev->mddev->raid_disks &&
3230 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3231 return -ENOSPC;
3232 rdev->raid_disk = slot;
3233 /* assume it is working */
3234 clear_bit(Faulty, &rdev->flags);
3235 clear_bit(WriteMostly, &rdev->flags);
3236 set_bit(In_sync, &rdev->flags);
3237 sysfs_notify_dirent_safe(rdev->sysfs_state);
3238 }
3239 return len;
3240 }
3241
3242 static struct rdev_sysfs_entry rdev_slot =
3243 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3244
3245 static ssize_t
offset_show(struct md_rdev * rdev,char * page)3246 offset_show(struct md_rdev *rdev, char *page)
3247 {
3248 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3249 }
3250
3251 static ssize_t
offset_store(struct md_rdev * rdev,const char * buf,size_t len)3252 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3253 {
3254 unsigned long long offset;
3255 if (kstrtoull(buf, 10, &offset) < 0)
3256 return -EINVAL;
3257 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3258 return -EBUSY;
3259 if (rdev->sectors && rdev->mddev->external)
3260 /* Must set offset before size, so overlap checks
3261 * can be sane */
3262 return -EBUSY;
3263 rdev->data_offset = offset;
3264 rdev->new_data_offset = offset;
3265 return len;
3266 }
3267
3268 static struct rdev_sysfs_entry rdev_offset =
3269 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3270
new_offset_show(struct md_rdev * rdev,char * page)3271 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3272 {
3273 return sprintf(page, "%llu\n",
3274 (unsigned long long)rdev->new_data_offset);
3275 }
3276
new_offset_store(struct md_rdev * rdev,const char * buf,size_t len)3277 static ssize_t new_offset_store(struct md_rdev *rdev,
3278 const char *buf, size_t len)
3279 {
3280 unsigned long long new_offset;
3281 struct mddev *mddev = rdev->mddev;
3282
3283 if (kstrtoull(buf, 10, &new_offset) < 0)
3284 return -EINVAL;
3285
3286 if (mddev->sync_thread ||
3287 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
3288 return -EBUSY;
3289 if (new_offset == rdev->data_offset)
3290 /* reset is always permitted */
3291 ;
3292 else if (new_offset > rdev->data_offset) {
3293 /* must not push array size beyond rdev_sectors */
3294 if (new_offset - rdev->data_offset
3295 + mddev->dev_sectors > rdev->sectors)
3296 return -E2BIG;
3297 }
3298 /* Metadata worries about other space details. */
3299
3300 /* decreasing the offset is inconsistent with a backwards
3301 * reshape.
3302 */
3303 if (new_offset < rdev->data_offset &&
3304 mddev->reshape_backwards)
3305 return -EINVAL;
3306 /* Increasing offset is inconsistent with forwards
3307 * reshape. reshape_direction should be set to
3308 * 'backwards' first.
3309 */
3310 if (new_offset > rdev->data_offset &&
3311 !mddev->reshape_backwards)
3312 return -EINVAL;
3313
3314 if (mddev->pers && mddev->persistent &&
3315 !super_types[mddev->major_version]
3316 .allow_new_offset(rdev, new_offset))
3317 return -E2BIG;
3318 rdev->new_data_offset = new_offset;
3319 if (new_offset > rdev->data_offset)
3320 mddev->reshape_backwards = 1;
3321 else if (new_offset < rdev->data_offset)
3322 mddev->reshape_backwards = 0;
3323
3324 return len;
3325 }
3326 static struct rdev_sysfs_entry rdev_new_offset =
3327 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3328
3329 static ssize_t
rdev_size_show(struct md_rdev * rdev,char * page)3330 rdev_size_show(struct md_rdev *rdev, char *page)
3331 {
3332 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3333 }
3334
md_rdevs_overlap(struct md_rdev * a,struct md_rdev * b)3335 static int md_rdevs_overlap(struct md_rdev *a, struct md_rdev *b)
3336 {
3337 /* check if two start/length pairs overlap */
3338 if (a->data_offset + a->sectors <= b->data_offset)
3339 return false;
3340 if (b->data_offset + b->sectors <= a->data_offset)
3341 return false;
3342 return true;
3343 }
3344
md_rdev_overlaps(struct md_rdev * rdev)3345 static bool md_rdev_overlaps(struct md_rdev *rdev)
3346 {
3347 struct mddev *mddev;
3348 struct md_rdev *rdev2;
3349
3350 spin_lock(&all_mddevs_lock);
3351 list_for_each_entry(mddev, &all_mddevs, all_mddevs) {
3352 if (test_bit(MD_DELETED, &mddev->flags))
3353 continue;
3354 rdev_for_each(rdev2, mddev) {
3355 if (rdev != rdev2 && rdev->bdev == rdev2->bdev &&
3356 md_rdevs_overlap(rdev, rdev2)) {
3357 spin_unlock(&all_mddevs_lock);
3358 return true;
3359 }
3360 }
3361 }
3362 spin_unlock(&all_mddevs_lock);
3363 return false;
3364 }
3365
strict_blocks_to_sectors(const char * buf,sector_t * sectors)3366 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3367 {
3368 unsigned long long blocks;
3369 sector_t new;
3370
3371 if (kstrtoull(buf, 10, &blocks) < 0)
3372 return -EINVAL;
3373
3374 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3375 return -EINVAL; /* sector conversion overflow */
3376
3377 new = blocks * 2;
3378 if (new != blocks * 2)
3379 return -EINVAL; /* unsigned long long to sector_t overflow */
3380
3381 *sectors = new;
3382 return 0;
3383 }
3384
3385 static ssize_t
rdev_size_store(struct md_rdev * rdev,const char * buf,size_t len)3386 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3387 {
3388 struct mddev *my_mddev = rdev->mddev;
3389 sector_t oldsectors = rdev->sectors;
3390 sector_t sectors;
3391
3392 if (test_bit(Journal, &rdev->flags))
3393 return -EBUSY;
3394 if (strict_blocks_to_sectors(buf, §ors) < 0)
3395 return -EINVAL;
3396 if (rdev->data_offset != rdev->new_data_offset)
3397 return -EINVAL; /* too confusing */
3398 if (my_mddev->pers && rdev->raid_disk >= 0) {
3399 if (my_mddev->persistent) {
3400 sectors = super_types[my_mddev->major_version].
3401 rdev_size_change(rdev, sectors);
3402 if (!sectors)
3403 return -EBUSY;
3404 } else if (!sectors)
3405 sectors = bdev_nr_sectors(rdev->bdev) -
3406 rdev->data_offset;
3407 if (!my_mddev->pers->resize)
3408 /* Cannot change size for RAID0 or Linear etc */
3409 return -EINVAL;
3410 }
3411 if (sectors < my_mddev->dev_sectors)
3412 return -EINVAL; /* component must fit device */
3413
3414 rdev->sectors = sectors;
3415
3416 /*
3417 * Check that all other rdevs with the same bdev do not overlap. This
3418 * check does not provide a hard guarantee, it just helps avoid
3419 * dangerous mistakes.
3420 */
3421 if (sectors > oldsectors && my_mddev->external &&
3422 md_rdev_overlaps(rdev)) {
3423 /*
3424 * Someone else could have slipped in a size change here, but
3425 * doing so is just silly. We put oldsectors back because we
3426 * know it is safe, and trust userspace not to race with itself.
3427 */
3428 rdev->sectors = oldsectors;
3429 return -EBUSY;
3430 }
3431 return len;
3432 }
3433
3434 static struct rdev_sysfs_entry rdev_size =
3435 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3436
recovery_start_show(struct md_rdev * rdev,char * page)3437 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3438 {
3439 unsigned long long recovery_start = rdev->recovery_offset;
3440
3441 if (test_bit(In_sync, &rdev->flags) ||
3442 recovery_start == MaxSector)
3443 return sprintf(page, "none\n");
3444
3445 return sprintf(page, "%llu\n", recovery_start);
3446 }
3447
recovery_start_store(struct md_rdev * rdev,const char * buf,size_t len)3448 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3449 {
3450 unsigned long long recovery_start;
3451
3452 if (cmd_match(buf, "none"))
3453 recovery_start = MaxSector;
3454 else if (kstrtoull(buf, 10, &recovery_start))
3455 return -EINVAL;
3456
3457 if (rdev->mddev->pers &&
3458 rdev->raid_disk >= 0)
3459 return -EBUSY;
3460
3461 rdev->recovery_offset = recovery_start;
3462 if (recovery_start == MaxSector)
3463 set_bit(In_sync, &rdev->flags);
3464 else
3465 clear_bit(In_sync, &rdev->flags);
3466 return len;
3467 }
3468
3469 static struct rdev_sysfs_entry rdev_recovery_start =
3470 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3471
3472 /* sysfs access to bad-blocks list.
3473 * We present two files.
3474 * 'bad-blocks' lists sector numbers and lengths of ranges that
3475 * are recorded as bad. The list is truncated to fit within
3476 * the one-page limit of sysfs.
3477 * Writing "sector length" to this file adds an acknowledged
3478 * bad block list.
3479 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3480 * been acknowledged. Writing to this file adds bad blocks
3481 * without acknowledging them. This is largely for testing.
3482 */
bb_show(struct md_rdev * rdev,char * page)3483 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3484 {
3485 return badblocks_show(&rdev->badblocks, page, 0);
3486 }
bb_store(struct md_rdev * rdev,const char * page,size_t len)3487 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3488 {
3489 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3490 /* Maybe that ack was all we needed */
3491 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3492 wake_up(&rdev->blocked_wait);
3493 return rv;
3494 }
3495 static struct rdev_sysfs_entry rdev_bad_blocks =
3496 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3497
ubb_show(struct md_rdev * rdev,char * page)3498 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3499 {
3500 return badblocks_show(&rdev->badblocks, page, 1);
3501 }
ubb_store(struct md_rdev * rdev,const char * page,size_t len)3502 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3503 {
3504 return badblocks_store(&rdev->badblocks, page, len, 1);
3505 }
3506 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3507 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3508
3509 static ssize_t
ppl_sector_show(struct md_rdev * rdev,char * page)3510 ppl_sector_show(struct md_rdev *rdev, char *page)
3511 {
3512 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3513 }
3514
3515 static ssize_t
ppl_sector_store(struct md_rdev * rdev,const char * buf,size_t len)3516 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3517 {
3518 unsigned long long sector;
3519
3520 if (kstrtoull(buf, 10, §or) < 0)
3521 return -EINVAL;
3522 if (sector != (sector_t)sector)
3523 return -EINVAL;
3524
3525 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3526 rdev->raid_disk >= 0)
3527 return -EBUSY;
3528
3529 if (rdev->mddev->persistent) {
3530 if (rdev->mddev->major_version == 0)
3531 return -EINVAL;
3532 if ((sector > rdev->sb_start &&
3533 sector - rdev->sb_start > S16_MAX) ||
3534 (sector < rdev->sb_start &&
3535 rdev->sb_start - sector > -S16_MIN))
3536 return -EINVAL;
3537 rdev->ppl.offset = sector - rdev->sb_start;
3538 } else if (!rdev->mddev->external) {
3539 return -EBUSY;
3540 }
3541 rdev->ppl.sector = sector;
3542 return len;
3543 }
3544
3545 static struct rdev_sysfs_entry rdev_ppl_sector =
3546 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3547
3548 static ssize_t
ppl_size_show(struct md_rdev * rdev,char * page)3549 ppl_size_show(struct md_rdev *rdev, char *page)
3550 {
3551 return sprintf(page, "%u\n", rdev->ppl.size);
3552 }
3553
3554 static ssize_t
ppl_size_store(struct md_rdev * rdev,const char * buf,size_t len)3555 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3556 {
3557 unsigned int size;
3558
3559 if (kstrtouint(buf, 10, &size) < 0)
3560 return -EINVAL;
3561
3562 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3563 rdev->raid_disk >= 0)
3564 return -EBUSY;
3565
3566 if (rdev->mddev->persistent) {
3567 if (rdev->mddev->major_version == 0)
3568 return -EINVAL;
3569 if (size > U16_MAX)
3570 return -EINVAL;
3571 } else if (!rdev->mddev->external) {
3572 return -EBUSY;
3573 }
3574 rdev->ppl.size = size;
3575 return len;
3576 }
3577
3578 static struct rdev_sysfs_entry rdev_ppl_size =
3579 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3580
3581 static struct attribute *rdev_default_attrs[] = {
3582 &rdev_state.attr,
3583 &rdev_errors.attr,
3584 &rdev_slot.attr,
3585 &rdev_offset.attr,
3586 &rdev_new_offset.attr,
3587 &rdev_size.attr,
3588 &rdev_recovery_start.attr,
3589 &rdev_bad_blocks.attr,
3590 &rdev_unack_bad_blocks.attr,
3591 &rdev_ppl_sector.attr,
3592 &rdev_ppl_size.attr,
3593 NULL,
3594 };
3595 ATTRIBUTE_GROUPS(rdev_default);
3596 static ssize_t
rdev_attr_show(struct kobject * kobj,struct attribute * attr,char * page)3597 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3598 {
3599 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3600 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3601
3602 if (!entry->show)
3603 return -EIO;
3604 if (!rdev->mddev)
3605 return -ENODEV;
3606 return entry->show(rdev, page);
3607 }
3608
3609 static ssize_t
rdev_attr_store(struct kobject * kobj,struct attribute * attr,const char * page,size_t length)3610 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3611 const char *page, size_t length)
3612 {
3613 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3614 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3615 struct kernfs_node *kn = NULL;
3616 ssize_t rv;
3617 struct mddev *mddev = rdev->mddev;
3618
3619 if (!entry->store)
3620 return -EIO;
3621 if (!capable(CAP_SYS_ADMIN))
3622 return -EACCES;
3623
3624 if (entry->store == state_store && cmd_match(page, "remove"))
3625 kn = sysfs_break_active_protection(kobj, attr);
3626
3627 rv = mddev ? mddev_lock(mddev) : -ENODEV;
3628 if (!rv) {
3629 if (rdev->mddev == NULL)
3630 rv = -ENODEV;
3631 else
3632 rv = entry->store(rdev, page, length);
3633 mddev_unlock(mddev);
3634 }
3635
3636 if (kn)
3637 sysfs_unbreak_active_protection(kn);
3638
3639 return rv;
3640 }
3641
rdev_free(struct kobject * ko)3642 static void rdev_free(struct kobject *ko)
3643 {
3644 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3645 kfree(rdev);
3646 }
3647 static const struct sysfs_ops rdev_sysfs_ops = {
3648 .show = rdev_attr_show,
3649 .store = rdev_attr_store,
3650 };
3651 static const struct kobj_type rdev_ktype = {
3652 .release = rdev_free,
3653 .sysfs_ops = &rdev_sysfs_ops,
3654 .default_groups = rdev_default_groups,
3655 };
3656
md_rdev_init(struct md_rdev * rdev)3657 int md_rdev_init(struct md_rdev *rdev)
3658 {
3659 rdev->desc_nr = -1;
3660 rdev->saved_raid_disk = -1;
3661 rdev->raid_disk = -1;
3662 rdev->flags = 0;
3663 rdev->data_offset = 0;
3664 rdev->new_data_offset = 0;
3665 rdev->sb_events = 0;
3666 rdev->last_read_error = 0;
3667 rdev->sb_loaded = 0;
3668 rdev->bb_page = NULL;
3669 atomic_set(&rdev->nr_pending, 0);
3670 atomic_set(&rdev->read_errors, 0);
3671 atomic_set(&rdev->corrected_errors, 0);
3672
3673 INIT_LIST_HEAD(&rdev->same_set);
3674 init_waitqueue_head(&rdev->blocked_wait);
3675
3676 /* Add space to store bad block list.
3677 * This reserves the space even on arrays where it cannot
3678 * be used - I wonder if that matters
3679 */
3680 return badblocks_init(&rdev->badblocks, 0);
3681 }
3682 EXPORT_SYMBOL_GPL(md_rdev_init);
3683
3684 /*
3685 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3686 *
3687 * mark the device faulty if:
3688 *
3689 * - the device is nonexistent (zero size)
3690 * - the device has no valid superblock
3691 *
3692 * a faulty rdev _never_ has rdev->sb set.
3693 */
md_import_device(dev_t newdev,int super_format,int super_minor)3694 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3695 {
3696 struct md_rdev *rdev;
3697 struct md_rdev *holder;
3698 sector_t size;
3699 int err;
3700
3701 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3702 if (!rdev)
3703 return ERR_PTR(-ENOMEM);
3704
3705 err = md_rdev_init(rdev);
3706 if (err)
3707 goto out_free_rdev;
3708 err = alloc_disk_sb(rdev);
3709 if (err)
3710 goto out_clear_rdev;
3711
3712 if (super_format == -2) {
3713 holder = &claim_rdev;
3714 } else {
3715 holder = rdev;
3716 set_bit(Holder, &rdev->flags);
3717 }
3718
3719 rdev->bdev = blkdev_get_by_dev(newdev, BLK_OPEN_READ | BLK_OPEN_WRITE,
3720 holder, NULL);
3721 if (IS_ERR(rdev->bdev)) {
3722 pr_warn("md: could not open device unknown-block(%u,%u).\n",
3723 MAJOR(newdev), MINOR(newdev));
3724 err = PTR_ERR(rdev->bdev);
3725 goto out_clear_rdev;
3726 }
3727
3728 kobject_init(&rdev->kobj, &rdev_ktype);
3729
3730 size = bdev_nr_bytes(rdev->bdev) >> BLOCK_SIZE_BITS;
3731 if (!size) {
3732 pr_warn("md: %pg has zero or unknown size, marking faulty!\n",
3733 rdev->bdev);
3734 err = -EINVAL;
3735 goto out_blkdev_put;
3736 }
3737
3738 if (super_format >= 0) {
3739 err = super_types[super_format].
3740 load_super(rdev, NULL, super_minor);
3741 if (err == -EINVAL) {
3742 pr_warn("md: %pg does not have a valid v%d.%d superblock, not importing!\n",
3743 rdev->bdev,
3744 super_format, super_minor);
3745 goto out_blkdev_put;
3746 }
3747 if (err < 0) {
3748 pr_warn("md: could not read %pg's sb, not importing!\n",
3749 rdev->bdev);
3750 goto out_blkdev_put;
3751 }
3752 }
3753
3754 return rdev;
3755
3756 out_blkdev_put:
3757 blkdev_put(rdev->bdev, holder);
3758 out_clear_rdev:
3759 md_rdev_clear(rdev);
3760 out_free_rdev:
3761 kfree(rdev);
3762 return ERR_PTR(err);
3763 }
3764
3765 /*
3766 * Check a full RAID array for plausibility
3767 */
3768
analyze_sbs(struct mddev * mddev)3769 static int analyze_sbs(struct mddev *mddev)
3770 {
3771 int i;
3772 struct md_rdev *rdev, *freshest, *tmp;
3773
3774 freshest = NULL;
3775 rdev_for_each_safe(rdev, tmp, mddev)
3776 switch (super_types[mddev->major_version].
3777 load_super(rdev, freshest, mddev->minor_version)) {
3778 case 1:
3779 freshest = rdev;
3780 break;
3781 case 0:
3782 break;
3783 default:
3784 pr_warn("md: fatal superblock inconsistency in %pg -- removing from array\n",
3785 rdev->bdev);
3786 md_kick_rdev_from_array(rdev);
3787 }
3788
3789 /* Cannot find a valid fresh disk */
3790 if (!freshest) {
3791 pr_warn("md: cannot find a valid disk\n");
3792 return -EINVAL;
3793 }
3794
3795 super_types[mddev->major_version].
3796 validate_super(mddev, NULL/*freshest*/, freshest);
3797
3798 i = 0;
3799 rdev_for_each_safe(rdev, tmp, mddev) {
3800 if (mddev->max_disks &&
3801 (rdev->desc_nr >= mddev->max_disks ||
3802 i > mddev->max_disks)) {
3803 pr_warn("md: %s: %pg: only %d devices permitted\n",
3804 mdname(mddev), rdev->bdev,
3805 mddev->max_disks);
3806 md_kick_rdev_from_array(rdev);
3807 continue;
3808 }
3809 if (rdev != freshest) {
3810 if (super_types[mddev->major_version].
3811 validate_super(mddev, freshest, rdev)) {
3812 pr_warn("md: kicking non-fresh %pg from array!\n",
3813 rdev->bdev);
3814 md_kick_rdev_from_array(rdev);
3815 continue;
3816 }
3817 }
3818 if (mddev->level == LEVEL_MULTIPATH) {
3819 rdev->desc_nr = i++;
3820 rdev->raid_disk = rdev->desc_nr;
3821 set_bit(In_sync, &rdev->flags);
3822 } else if (rdev->raid_disk >=
3823 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3824 !test_bit(Journal, &rdev->flags)) {
3825 rdev->raid_disk = -1;
3826 clear_bit(In_sync, &rdev->flags);
3827 }
3828 }
3829
3830 return 0;
3831 }
3832
3833 /* Read a fixed-point number.
3834 * Numbers in sysfs attributes should be in "standard" units where
3835 * possible, so time should be in seconds.
3836 * However we internally use a a much smaller unit such as
3837 * milliseconds or jiffies.
3838 * This function takes a decimal number with a possible fractional
3839 * component, and produces an integer which is the result of
3840 * multiplying that number by 10^'scale'.
3841 * all without any floating-point arithmetic.
3842 */
strict_strtoul_scaled(const char * cp,unsigned long * res,int scale)3843 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3844 {
3845 unsigned long result = 0;
3846 long decimals = -1;
3847 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3848 if (*cp == '.')
3849 decimals = 0;
3850 else if (decimals < scale) {
3851 unsigned int value;
3852 value = *cp - '0';
3853 result = result * 10 + value;
3854 if (decimals >= 0)
3855 decimals++;
3856 }
3857 cp++;
3858 }
3859 if (*cp == '\n')
3860 cp++;
3861 if (*cp)
3862 return -EINVAL;
3863 if (decimals < 0)
3864 decimals = 0;
3865 *res = result * int_pow(10, scale - decimals);
3866 return 0;
3867 }
3868
3869 static ssize_t
safe_delay_show(struct mddev * mddev,char * page)3870 safe_delay_show(struct mddev *mddev, char *page)
3871 {
3872 unsigned int msec = ((unsigned long)mddev->safemode_delay*1000)/HZ;
3873
3874 return sprintf(page, "%u.%03u\n", msec/1000, msec%1000);
3875 }
3876 static ssize_t
safe_delay_store(struct mddev * mddev,const char * cbuf,size_t len)3877 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3878 {
3879 unsigned long msec;
3880
3881 if (mddev_is_clustered(mddev)) {
3882 pr_warn("md: Safemode is disabled for clustered mode\n");
3883 return -EINVAL;
3884 }
3885
3886 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0 || msec > UINT_MAX / HZ)
3887 return -EINVAL;
3888 if (msec == 0)
3889 mddev->safemode_delay = 0;
3890 else {
3891 unsigned long old_delay = mddev->safemode_delay;
3892 unsigned long new_delay = (msec*HZ)/1000;
3893
3894 if (new_delay == 0)
3895 new_delay = 1;
3896 mddev->safemode_delay = new_delay;
3897 if (new_delay < old_delay || old_delay == 0)
3898 mod_timer(&mddev->safemode_timer, jiffies+1);
3899 }
3900 return len;
3901 }
3902 static struct md_sysfs_entry md_safe_delay =
3903 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3904
3905 static ssize_t
level_show(struct mddev * mddev,char * page)3906 level_show(struct mddev *mddev, char *page)
3907 {
3908 struct md_personality *p;
3909 int ret;
3910 spin_lock(&mddev->lock);
3911 p = mddev->pers;
3912 if (p)
3913 ret = sprintf(page, "%s\n", p->name);
3914 else if (mddev->clevel[0])
3915 ret = sprintf(page, "%s\n", mddev->clevel);
3916 else if (mddev->level != LEVEL_NONE)
3917 ret = sprintf(page, "%d\n", mddev->level);
3918 else
3919 ret = 0;
3920 spin_unlock(&mddev->lock);
3921 return ret;
3922 }
3923
3924 static ssize_t
level_store(struct mddev * mddev,const char * buf,size_t len)3925 level_store(struct mddev *mddev, const char *buf, size_t len)
3926 {
3927 char clevel[16];
3928 ssize_t rv;
3929 size_t slen = len;
3930 struct md_personality *pers, *oldpers;
3931 long level;
3932 void *priv, *oldpriv;
3933 struct md_rdev *rdev;
3934
3935 if (slen == 0 || slen >= sizeof(clevel))
3936 return -EINVAL;
3937
3938 rv = mddev_lock(mddev);
3939 if (rv)
3940 return rv;
3941
3942 if (mddev->pers == NULL) {
3943 strncpy(mddev->clevel, buf, slen);
3944 if (mddev->clevel[slen-1] == '\n')
3945 slen--;
3946 mddev->clevel[slen] = 0;
3947 mddev->level = LEVEL_NONE;
3948 rv = len;
3949 goto out_unlock;
3950 }
3951 rv = -EROFS;
3952 if (!md_is_rdwr(mddev))
3953 goto out_unlock;
3954
3955 /* request to change the personality. Need to ensure:
3956 * - array is not engaged in resync/recovery/reshape
3957 * - old personality can be suspended
3958 * - new personality will access other array.
3959 */
3960
3961 rv = -EBUSY;
3962 if (mddev->sync_thread ||
3963 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3964 mddev->reshape_position != MaxSector ||
3965 mddev->sysfs_active)
3966 goto out_unlock;
3967
3968 rv = -EINVAL;
3969 if (!mddev->pers->quiesce) {
3970 pr_warn("md: %s: %s does not support online personality change\n",
3971 mdname(mddev), mddev->pers->name);
3972 goto out_unlock;
3973 }
3974
3975 /* Now find the new personality */
3976 strncpy(clevel, buf, slen);
3977 if (clevel[slen-1] == '\n')
3978 slen--;
3979 clevel[slen] = 0;
3980 if (kstrtol(clevel, 10, &level))
3981 level = LEVEL_NONE;
3982
3983 if (request_module("md-%s", clevel) != 0)
3984 request_module("md-level-%s", clevel);
3985 spin_lock(&pers_lock);
3986 pers = find_pers(level, clevel);
3987 if (!pers || !try_module_get(pers->owner)) {
3988 spin_unlock(&pers_lock);
3989 pr_warn("md: personality %s not loaded\n", clevel);
3990 rv = -EINVAL;
3991 goto out_unlock;
3992 }
3993 spin_unlock(&pers_lock);
3994
3995 if (pers == mddev->pers) {
3996 /* Nothing to do! */
3997 module_put(pers->owner);
3998 rv = len;
3999 goto out_unlock;
4000 }
4001 if (!pers->takeover) {
4002 module_put(pers->owner);
4003 pr_warn("md: %s: %s does not support personality takeover\n",
4004 mdname(mddev), clevel);
4005 rv = -EINVAL;
4006 goto out_unlock;
4007 }
4008
4009 rdev_for_each(rdev, mddev)
4010 rdev->new_raid_disk = rdev->raid_disk;
4011
4012 /* ->takeover must set new_* and/or delta_disks
4013 * if it succeeds, and may set them when it fails.
4014 */
4015 priv = pers->takeover(mddev);
4016 if (IS_ERR(priv)) {
4017 mddev->new_level = mddev->level;
4018 mddev->new_layout = mddev->layout;
4019 mddev->new_chunk_sectors = mddev->chunk_sectors;
4020 mddev->raid_disks -= mddev->delta_disks;
4021 mddev->delta_disks = 0;
4022 mddev->reshape_backwards = 0;
4023 module_put(pers->owner);
4024 pr_warn("md: %s: %s would not accept array\n",
4025 mdname(mddev), clevel);
4026 rv = PTR_ERR(priv);
4027 goto out_unlock;
4028 }
4029
4030 /* Looks like we have a winner */
4031 mddev_suspend(mddev);
4032 mddev_detach(mddev);
4033
4034 spin_lock(&mddev->lock);
4035 oldpers = mddev->pers;
4036 oldpriv = mddev->private;
4037 mddev->pers = pers;
4038 mddev->private = priv;
4039 strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4040 mddev->level = mddev->new_level;
4041 mddev->layout = mddev->new_layout;
4042 mddev->chunk_sectors = mddev->new_chunk_sectors;
4043 mddev->delta_disks = 0;
4044 mddev->reshape_backwards = 0;
4045 mddev->degraded = 0;
4046 spin_unlock(&mddev->lock);
4047
4048 if (oldpers->sync_request == NULL &&
4049 mddev->external) {
4050 /* We are converting from a no-redundancy array
4051 * to a redundancy array and metadata is managed
4052 * externally so we need to be sure that writes
4053 * won't block due to a need to transition
4054 * clean->dirty
4055 * until external management is started.
4056 */
4057 mddev->in_sync = 0;
4058 mddev->safemode_delay = 0;
4059 mddev->safemode = 0;
4060 }
4061
4062 oldpers->free(mddev, oldpriv);
4063
4064 if (oldpers->sync_request == NULL &&
4065 pers->sync_request != NULL) {
4066 /* need to add the md_redundancy_group */
4067 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4068 pr_warn("md: cannot register extra attributes for %s\n",
4069 mdname(mddev));
4070 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4071 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
4072 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
4073 }
4074 if (oldpers->sync_request != NULL &&
4075 pers->sync_request == NULL) {
4076 /* need to remove the md_redundancy_group */
4077 if (mddev->to_remove == NULL)
4078 mddev->to_remove = &md_redundancy_group;
4079 }
4080
4081 module_put(oldpers->owner);
4082
4083 rdev_for_each(rdev, mddev) {
4084 if (rdev->raid_disk < 0)
4085 continue;
4086 if (rdev->new_raid_disk >= mddev->raid_disks)
4087 rdev->new_raid_disk = -1;
4088 if (rdev->new_raid_disk == rdev->raid_disk)
4089 continue;
4090 sysfs_unlink_rdev(mddev, rdev);
4091 }
4092 rdev_for_each(rdev, mddev) {
4093 if (rdev->raid_disk < 0)
4094 continue;
4095 if (rdev->new_raid_disk == rdev->raid_disk)
4096 continue;
4097 rdev->raid_disk = rdev->new_raid_disk;
4098 if (rdev->raid_disk < 0)
4099 clear_bit(In_sync, &rdev->flags);
4100 else {
4101 if (sysfs_link_rdev(mddev, rdev))
4102 pr_warn("md: cannot register rd%d for %s after level change\n",
4103 rdev->raid_disk, mdname(mddev));
4104 }
4105 }
4106
4107 if (pers->sync_request == NULL) {
4108 /* this is now an array without redundancy, so
4109 * it must always be in_sync
4110 */
4111 mddev->in_sync = 1;
4112 del_timer_sync(&mddev->safemode_timer);
4113 }
4114 blk_set_stacking_limits(&mddev->queue->limits);
4115 pers->run(mddev);
4116 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
4117 mddev_resume(mddev);
4118 if (!mddev->thread)
4119 md_update_sb(mddev, 1);
4120 sysfs_notify_dirent_safe(mddev->sysfs_level);
4121 md_new_event();
4122 rv = len;
4123 out_unlock:
4124 mddev_unlock(mddev);
4125 return rv;
4126 }
4127
4128 static struct md_sysfs_entry md_level =
4129 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
4130
4131 static ssize_t
layout_show(struct mddev * mddev,char * page)4132 layout_show(struct mddev *mddev, char *page)
4133 {
4134 /* just a number, not meaningful for all levels */
4135 if (mddev->reshape_position != MaxSector &&
4136 mddev->layout != mddev->new_layout)
4137 return sprintf(page, "%d (%d)\n",
4138 mddev->new_layout, mddev->layout);
4139 return sprintf(page, "%d\n", mddev->layout);
4140 }
4141
4142 static ssize_t
layout_store(struct mddev * mddev,const char * buf,size_t len)4143 layout_store(struct mddev *mddev, const char *buf, size_t len)
4144 {
4145 unsigned int n;
4146 int err;
4147
4148 err = kstrtouint(buf, 10, &n);
4149 if (err < 0)
4150 return err;
4151 err = mddev_lock(mddev);
4152 if (err)
4153 return err;
4154
4155 if (mddev->pers) {
4156 if (mddev->pers->check_reshape == NULL)
4157 err = -EBUSY;
4158 else if (!md_is_rdwr(mddev))
4159 err = -EROFS;
4160 else {
4161 mddev->new_layout = n;
4162 err = mddev->pers->check_reshape(mddev);
4163 if (err)
4164 mddev->new_layout = mddev->layout;
4165 }
4166 } else {
4167 mddev->new_layout = n;
4168 if (mddev->reshape_position == MaxSector)
4169 mddev->layout = n;
4170 }
4171 mddev_unlock(mddev);
4172 return err ?: len;
4173 }
4174 static struct md_sysfs_entry md_layout =
4175 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
4176
4177 static ssize_t
raid_disks_show(struct mddev * mddev,char * page)4178 raid_disks_show(struct mddev *mddev, char *page)
4179 {
4180 if (mddev->raid_disks == 0)
4181 return 0;
4182 if (mddev->reshape_position != MaxSector &&
4183 mddev->delta_disks != 0)
4184 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
4185 mddev->raid_disks - mddev->delta_disks);
4186 return sprintf(page, "%d\n", mddev->raid_disks);
4187 }
4188
4189 static int update_raid_disks(struct mddev *mddev, int raid_disks);
4190
4191 static ssize_t
raid_disks_store(struct mddev * mddev,const char * buf,size_t len)4192 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
4193 {
4194 unsigned int n;
4195 int err;
4196
4197 err = kstrtouint(buf, 10, &n);
4198 if (err < 0)
4199 return err;
4200
4201 err = mddev_lock(mddev);
4202 if (err)
4203 return err;
4204 if (mddev->pers)
4205 err = update_raid_disks(mddev, n);
4206 else if (mddev->reshape_position != MaxSector) {
4207 struct md_rdev *rdev;
4208 int olddisks = mddev->raid_disks - mddev->delta_disks;
4209
4210 err = -EINVAL;
4211 rdev_for_each(rdev, mddev) {
4212 if (olddisks < n &&
4213 rdev->data_offset < rdev->new_data_offset)
4214 goto out_unlock;
4215 if (olddisks > n &&
4216 rdev->data_offset > rdev->new_data_offset)
4217 goto out_unlock;
4218 }
4219 err = 0;
4220 mddev->delta_disks = n - olddisks;
4221 mddev->raid_disks = n;
4222 mddev->reshape_backwards = (mddev->delta_disks < 0);
4223 } else
4224 mddev->raid_disks = n;
4225 out_unlock:
4226 mddev_unlock(mddev);
4227 return err ? err : len;
4228 }
4229 static struct md_sysfs_entry md_raid_disks =
4230 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
4231
4232 static ssize_t
uuid_show(struct mddev * mddev,char * page)4233 uuid_show(struct mddev *mddev, char *page)
4234 {
4235 return sprintf(page, "%pU\n", mddev->uuid);
4236 }
4237 static struct md_sysfs_entry md_uuid =
4238 __ATTR(uuid, S_IRUGO, uuid_show, NULL);
4239
4240 static ssize_t
chunk_size_show(struct mddev * mddev,char * page)4241 chunk_size_show(struct mddev *mddev, char *page)
4242 {
4243 if (mddev->reshape_position != MaxSector &&
4244 mddev->chunk_sectors != mddev->new_chunk_sectors)
4245 return sprintf(page, "%d (%d)\n",
4246 mddev->new_chunk_sectors << 9,
4247 mddev->chunk_sectors << 9);
4248 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
4249 }
4250
4251 static ssize_t
chunk_size_store(struct mddev * mddev,const char * buf,size_t len)4252 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
4253 {
4254 unsigned long n;
4255 int err;
4256
4257 err = kstrtoul(buf, 10, &n);
4258 if (err < 0)
4259 return err;
4260
4261 err = mddev_lock(mddev);
4262 if (err)
4263 return err;
4264 if (mddev->pers) {
4265 if (mddev->pers->check_reshape == NULL)
4266 err = -EBUSY;
4267 else if (!md_is_rdwr(mddev))
4268 err = -EROFS;
4269 else {
4270 mddev->new_chunk_sectors = n >> 9;
4271 err = mddev->pers->check_reshape(mddev);
4272 if (err)
4273 mddev->new_chunk_sectors = mddev->chunk_sectors;
4274 }
4275 } else {
4276 mddev->new_chunk_sectors = n >> 9;
4277 if (mddev->reshape_position == MaxSector)
4278 mddev->chunk_sectors = n >> 9;
4279 }
4280 mddev_unlock(mddev);
4281 return err ?: len;
4282 }
4283 static struct md_sysfs_entry md_chunk_size =
4284 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4285
4286 static ssize_t
resync_start_show(struct mddev * mddev,char * page)4287 resync_start_show(struct mddev *mddev, char *page)
4288 {
4289 if (mddev->recovery_cp == MaxSector)
4290 return sprintf(page, "none\n");
4291 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4292 }
4293
4294 static ssize_t
resync_start_store(struct mddev * mddev,const char * buf,size_t len)4295 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4296 {
4297 unsigned long long n;
4298 int err;
4299
4300 if (cmd_match(buf, "none"))
4301 n = MaxSector;
4302 else {
4303 err = kstrtoull(buf, 10, &n);
4304 if (err < 0)
4305 return err;
4306 if (n != (sector_t)n)
4307 return -EINVAL;
4308 }
4309
4310 err = mddev_lock(mddev);
4311 if (err)
4312 return err;
4313 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4314 err = -EBUSY;
4315
4316 if (!err) {
4317 mddev->recovery_cp = n;
4318 if (mddev->pers)
4319 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4320 }
4321 mddev_unlock(mddev);
4322 return err ?: len;
4323 }
4324 static struct md_sysfs_entry md_resync_start =
4325 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4326 resync_start_show, resync_start_store);
4327
4328 /*
4329 * The array state can be:
4330 *
4331 * clear
4332 * No devices, no size, no level
4333 * Equivalent to STOP_ARRAY ioctl
4334 * inactive
4335 * May have some settings, but array is not active
4336 * all IO results in error
4337 * When written, doesn't tear down array, but just stops it
4338 * suspended (not supported yet)
4339 * All IO requests will block. The array can be reconfigured.
4340 * Writing this, if accepted, will block until array is quiescent
4341 * readonly
4342 * no resync can happen. no superblocks get written.
4343 * write requests fail
4344 * read-auto
4345 * like readonly, but behaves like 'clean' on a write request.
4346 *
4347 * clean - no pending writes, but otherwise active.
4348 * When written to inactive array, starts without resync
4349 * If a write request arrives then
4350 * if metadata is known, mark 'dirty' and switch to 'active'.
4351 * if not known, block and switch to write-pending
4352 * If written to an active array that has pending writes, then fails.
4353 * active
4354 * fully active: IO and resync can be happening.
4355 * When written to inactive array, starts with resync
4356 *
4357 * write-pending
4358 * clean, but writes are blocked waiting for 'active' to be written.
4359 *
4360 * active-idle
4361 * like active, but no writes have been seen for a while (100msec).
4362 *
4363 * broken
4364 * Array is failed. It's useful because mounted-arrays aren't stopped
4365 * when array is failed, so this state will at least alert the user that
4366 * something is wrong.
4367 */
4368 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4369 write_pending, active_idle, broken, bad_word};
4370 static char *array_states[] = {
4371 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4372 "write-pending", "active-idle", "broken", NULL };
4373
match_word(const char * word,char ** list)4374 static int match_word(const char *word, char **list)
4375 {
4376 int n;
4377 for (n=0; list[n]; n++)
4378 if (cmd_match(word, list[n]))
4379 break;
4380 return n;
4381 }
4382
4383 static ssize_t
array_state_show(struct mddev * mddev,char * page)4384 array_state_show(struct mddev *mddev, char *page)
4385 {
4386 enum array_state st = inactive;
4387
4388 if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags)) {
4389 switch(mddev->ro) {
4390 case MD_RDONLY:
4391 st = readonly;
4392 break;
4393 case MD_AUTO_READ:
4394 st = read_auto;
4395 break;
4396 case MD_RDWR:
4397 spin_lock(&mddev->lock);
4398 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4399 st = write_pending;
4400 else if (mddev->in_sync)
4401 st = clean;
4402 else if (mddev->safemode)
4403 st = active_idle;
4404 else
4405 st = active;
4406 spin_unlock(&mddev->lock);
4407 }
4408
4409 if (test_bit(MD_BROKEN, &mddev->flags) && st == clean)
4410 st = broken;
4411 } else {
4412 if (list_empty(&mddev->disks) &&
4413 mddev->raid_disks == 0 &&
4414 mddev->dev_sectors == 0)
4415 st = clear;
4416 else
4417 st = inactive;
4418 }
4419 return sprintf(page, "%s\n", array_states[st]);
4420 }
4421
4422 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4423 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4424 static int restart_array(struct mddev *mddev);
4425
4426 static ssize_t
array_state_store(struct mddev * mddev,const char * buf,size_t len)4427 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4428 {
4429 int err = 0;
4430 enum array_state st = match_word(buf, array_states);
4431
4432 if (mddev->pers && (st == active || st == clean) &&
4433 mddev->ro != MD_RDONLY) {
4434 /* don't take reconfig_mutex when toggling between
4435 * clean and active
4436 */
4437 spin_lock(&mddev->lock);
4438 if (st == active) {
4439 restart_array(mddev);
4440 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4441 md_wakeup_thread(mddev->thread);
4442 wake_up(&mddev->sb_wait);
4443 } else /* st == clean */ {
4444 restart_array(mddev);
4445 if (!set_in_sync(mddev))
4446 err = -EBUSY;
4447 }
4448 if (!err)
4449 sysfs_notify_dirent_safe(mddev->sysfs_state);
4450 spin_unlock(&mddev->lock);
4451 return err ?: len;
4452 }
4453 err = mddev_lock(mddev);
4454 if (err)
4455 return err;
4456 err = -EINVAL;
4457 switch(st) {
4458 case bad_word:
4459 break;
4460 case clear:
4461 /* stopping an active array */
4462 err = do_md_stop(mddev, 0, NULL);
4463 break;
4464 case inactive:
4465 /* stopping an active array */
4466 if (mddev->pers)
4467 err = do_md_stop(mddev, 2, NULL);
4468 else
4469 err = 0; /* already inactive */
4470 break;
4471 case suspended:
4472 break; /* not supported yet */
4473 case readonly:
4474 if (mddev->pers)
4475 err = md_set_readonly(mddev, NULL);
4476 else {
4477 mddev->ro = MD_RDONLY;
4478 set_disk_ro(mddev->gendisk, 1);
4479 err = do_md_run(mddev);
4480 }
4481 break;
4482 case read_auto:
4483 if (mddev->pers) {
4484 if (md_is_rdwr(mddev))
4485 err = md_set_readonly(mddev, NULL);
4486 else if (mddev->ro == MD_RDONLY)
4487 err = restart_array(mddev);
4488 if (err == 0) {
4489 mddev->ro = MD_AUTO_READ;
4490 set_disk_ro(mddev->gendisk, 0);
4491 }
4492 } else {
4493 mddev->ro = MD_AUTO_READ;
4494 err = do_md_run(mddev);
4495 }
4496 break;
4497 case clean:
4498 if (mddev->pers) {
4499 err = restart_array(mddev);
4500 if (err)
4501 break;
4502 spin_lock(&mddev->lock);
4503 if (!set_in_sync(mddev))
4504 err = -EBUSY;
4505 spin_unlock(&mddev->lock);
4506 } else
4507 err = -EINVAL;
4508 break;
4509 case active:
4510 if (mddev->pers) {
4511 err = restart_array(mddev);
4512 if (err)
4513 break;
4514 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4515 wake_up(&mddev->sb_wait);
4516 err = 0;
4517 } else {
4518 mddev->ro = MD_RDWR;
4519 set_disk_ro(mddev->gendisk, 0);
4520 err = do_md_run(mddev);
4521 }
4522 break;
4523 case write_pending:
4524 case active_idle:
4525 case broken:
4526 /* these cannot be set */
4527 break;
4528 }
4529
4530 if (!err) {
4531 if (mddev->hold_active == UNTIL_IOCTL)
4532 mddev->hold_active = 0;
4533 sysfs_notify_dirent_safe(mddev->sysfs_state);
4534 }
4535 mddev_unlock(mddev);
4536 return err ?: len;
4537 }
4538 static struct md_sysfs_entry md_array_state =
4539 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4540
4541 static ssize_t
max_corrected_read_errors_show(struct mddev * mddev,char * page)4542 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4543 return sprintf(page, "%d\n",
4544 atomic_read(&mddev->max_corr_read_errors));
4545 }
4546
4547 static ssize_t
max_corrected_read_errors_store(struct mddev * mddev,const char * buf,size_t len)4548 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4549 {
4550 unsigned int n;
4551 int rv;
4552
4553 rv = kstrtouint(buf, 10, &n);
4554 if (rv < 0)
4555 return rv;
4556 if (n > INT_MAX)
4557 return -EINVAL;
4558 atomic_set(&mddev->max_corr_read_errors, n);
4559 return len;
4560 }
4561
4562 static struct md_sysfs_entry max_corr_read_errors =
4563 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4564 max_corrected_read_errors_store);
4565
4566 static ssize_t
null_show(struct mddev * mddev,char * page)4567 null_show(struct mddev *mddev, char *page)
4568 {
4569 return -EINVAL;
4570 }
4571
4572 static ssize_t
new_dev_store(struct mddev * mddev,const char * buf,size_t len)4573 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4574 {
4575 /* buf must be %d:%d\n? giving major and minor numbers */
4576 /* The new device is added to the array.
4577 * If the array has a persistent superblock, we read the
4578 * superblock to initialise info and check validity.
4579 * Otherwise, only checking done is that in bind_rdev_to_array,
4580 * which mainly checks size.
4581 */
4582 char *e;
4583 int major = simple_strtoul(buf, &e, 10);
4584 int minor;
4585 dev_t dev;
4586 struct md_rdev *rdev;
4587 int err;
4588
4589 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4590 return -EINVAL;
4591 minor = simple_strtoul(e+1, &e, 10);
4592 if (*e && *e != '\n')
4593 return -EINVAL;
4594 dev = MKDEV(major, minor);
4595 if (major != MAJOR(dev) ||
4596 minor != MINOR(dev))
4597 return -EOVERFLOW;
4598
4599 err = mddev_lock(mddev);
4600 if (err)
4601 return err;
4602 if (mddev->persistent) {
4603 rdev = md_import_device(dev, mddev->major_version,
4604 mddev->minor_version);
4605 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4606 struct md_rdev *rdev0
4607 = list_entry(mddev->disks.next,
4608 struct md_rdev, same_set);
4609 err = super_types[mddev->major_version]
4610 .load_super(rdev, rdev0, mddev->minor_version);
4611 if (err < 0)
4612 goto out;
4613 }
4614 } else if (mddev->external)
4615 rdev = md_import_device(dev, -2, -1);
4616 else
4617 rdev = md_import_device(dev, -1, -1);
4618
4619 if (IS_ERR(rdev)) {
4620 mddev_unlock(mddev);
4621 return PTR_ERR(rdev);
4622 }
4623 err = bind_rdev_to_array(rdev, mddev);
4624 out:
4625 if (err)
4626 export_rdev(rdev, mddev);
4627 mddev_unlock(mddev);
4628 if (!err)
4629 md_new_event();
4630 return err ? err : len;
4631 }
4632
4633 static struct md_sysfs_entry md_new_device =
4634 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4635
4636 static ssize_t
bitmap_store(struct mddev * mddev,const char * buf,size_t len)4637 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4638 {
4639 char *end;
4640 unsigned long chunk, end_chunk;
4641 int err;
4642
4643 err = mddev_lock(mddev);
4644 if (err)
4645 return err;
4646 if (!mddev->bitmap)
4647 goto out;
4648 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4649 while (*buf) {
4650 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4651 if (buf == end) break;
4652 if (*end == '-') { /* range */
4653 buf = end + 1;
4654 end_chunk = simple_strtoul(buf, &end, 0);
4655 if (buf == end) break;
4656 }
4657 if (*end && !isspace(*end)) break;
4658 md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4659 buf = skip_spaces(end);
4660 }
4661 md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4662 out:
4663 mddev_unlock(mddev);
4664 return len;
4665 }
4666
4667 static struct md_sysfs_entry md_bitmap =
4668 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4669
4670 static ssize_t
size_show(struct mddev * mddev,char * page)4671 size_show(struct mddev *mddev, char *page)
4672 {
4673 return sprintf(page, "%llu\n",
4674 (unsigned long long)mddev->dev_sectors / 2);
4675 }
4676
4677 static int update_size(struct mddev *mddev, sector_t num_sectors);
4678
4679 static ssize_t
size_store(struct mddev * mddev,const char * buf,size_t len)4680 size_store(struct mddev *mddev, const char *buf, size_t len)
4681 {
4682 /* If array is inactive, we can reduce the component size, but
4683 * not increase it (except from 0).
4684 * If array is active, we can try an on-line resize
4685 */
4686 sector_t sectors;
4687 int err = strict_blocks_to_sectors(buf, §ors);
4688
4689 if (err < 0)
4690 return err;
4691 err = mddev_lock(mddev);
4692 if (err)
4693 return err;
4694 if (mddev->pers) {
4695 err = update_size(mddev, sectors);
4696 if (err == 0)
4697 md_update_sb(mddev, 1);
4698 } else {
4699 if (mddev->dev_sectors == 0 ||
4700 mddev->dev_sectors > sectors)
4701 mddev->dev_sectors = sectors;
4702 else
4703 err = -ENOSPC;
4704 }
4705 mddev_unlock(mddev);
4706 return err ? err : len;
4707 }
4708
4709 static struct md_sysfs_entry md_size =
4710 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4711
4712 /* Metadata version.
4713 * This is one of
4714 * 'none' for arrays with no metadata (good luck...)
4715 * 'external' for arrays with externally managed metadata,
4716 * or N.M for internally known formats
4717 */
4718 static ssize_t
metadata_show(struct mddev * mddev,char * page)4719 metadata_show(struct mddev *mddev, char *page)
4720 {
4721 if (mddev->persistent)
4722 return sprintf(page, "%d.%d\n",
4723 mddev->major_version, mddev->minor_version);
4724 else if (mddev->external)
4725 return sprintf(page, "external:%s\n", mddev->metadata_type);
4726 else
4727 return sprintf(page, "none\n");
4728 }
4729
4730 static ssize_t
metadata_store(struct mddev * mddev,const char * buf,size_t len)4731 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4732 {
4733 int major, minor;
4734 char *e;
4735 int err;
4736 /* Changing the details of 'external' metadata is
4737 * always permitted. Otherwise there must be
4738 * no devices attached to the array.
4739 */
4740
4741 err = mddev_lock(mddev);
4742 if (err)
4743 return err;
4744 err = -EBUSY;
4745 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4746 ;
4747 else if (!list_empty(&mddev->disks))
4748 goto out_unlock;
4749
4750 err = 0;
4751 if (cmd_match(buf, "none")) {
4752 mddev->persistent = 0;
4753 mddev->external = 0;
4754 mddev->major_version = 0;
4755 mddev->minor_version = 90;
4756 goto out_unlock;
4757 }
4758 if (strncmp(buf, "external:", 9) == 0) {
4759 size_t namelen = len-9;
4760 if (namelen >= sizeof(mddev->metadata_type))
4761 namelen = sizeof(mddev->metadata_type)-1;
4762 strncpy(mddev->metadata_type, buf+9, namelen);
4763 mddev->metadata_type[namelen] = 0;
4764 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4765 mddev->metadata_type[--namelen] = 0;
4766 mddev->persistent = 0;
4767 mddev->external = 1;
4768 mddev->major_version = 0;
4769 mddev->minor_version = 90;
4770 goto out_unlock;
4771 }
4772 major = simple_strtoul(buf, &e, 10);
4773 err = -EINVAL;
4774 if (e==buf || *e != '.')
4775 goto out_unlock;
4776 buf = e+1;
4777 minor = simple_strtoul(buf, &e, 10);
4778 if (e==buf || (*e && *e != '\n') )
4779 goto out_unlock;
4780 err = -ENOENT;
4781 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4782 goto out_unlock;
4783 mddev->major_version = major;
4784 mddev->minor_version = minor;
4785 mddev->persistent = 1;
4786 mddev->external = 0;
4787 err = 0;
4788 out_unlock:
4789 mddev_unlock(mddev);
4790 return err ?: len;
4791 }
4792
4793 static struct md_sysfs_entry md_metadata =
4794 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4795
4796 static ssize_t
action_show(struct mddev * mddev,char * page)4797 action_show(struct mddev *mddev, char *page)
4798 {
4799 char *type = "idle";
4800 unsigned long recovery = mddev->recovery;
4801 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4802 type = "frozen";
4803 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4804 (md_is_rdwr(mddev) && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4805 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4806 type = "reshape";
4807 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4808 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4809 type = "resync";
4810 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4811 type = "check";
4812 else
4813 type = "repair";
4814 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4815 type = "recover";
4816 else if (mddev->reshape_position != MaxSector)
4817 type = "reshape";
4818 }
4819 return sprintf(page, "%s\n", type);
4820 }
4821
stop_sync_thread(struct mddev * mddev)4822 static void stop_sync_thread(struct mddev *mddev)
4823 {
4824 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4825 return;
4826
4827 if (mddev_lock(mddev))
4828 return;
4829
4830 /*
4831 * Check again in case MD_RECOVERY_RUNNING is cleared before lock is
4832 * held.
4833 */
4834 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
4835 mddev_unlock(mddev);
4836 return;
4837 }
4838
4839 if (work_pending(&mddev->sync_work))
4840 flush_workqueue(md_misc_wq);
4841
4842 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4843 /*
4844 * Thread might be blocked waiting for metadata update which will now
4845 * never happen
4846 */
4847 md_wakeup_thread_directly(mddev->sync_thread);
4848
4849 mddev_unlock(mddev);
4850 }
4851
idle_sync_thread(struct mddev * mddev)4852 static void idle_sync_thread(struct mddev *mddev)
4853 {
4854 int sync_seq = atomic_read(&mddev->sync_seq);
4855
4856 mutex_lock(&mddev->sync_mutex);
4857 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4858 stop_sync_thread(mddev);
4859
4860 wait_event(resync_wait, sync_seq != atomic_read(&mddev->sync_seq) ||
4861 !test_bit(MD_RECOVERY_RUNNING, &mddev->recovery));
4862
4863 mutex_unlock(&mddev->sync_mutex);
4864 }
4865
frozen_sync_thread(struct mddev * mddev)4866 static void frozen_sync_thread(struct mddev *mddev)
4867 {
4868 mutex_lock(&mddev->sync_mutex);
4869 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4870 stop_sync_thread(mddev);
4871
4872 wait_event(resync_wait, mddev->sync_thread == NULL &&
4873 !test_bit(MD_RECOVERY_RUNNING, &mddev->recovery));
4874
4875 mutex_unlock(&mddev->sync_mutex);
4876 }
4877
4878 static ssize_t
action_store(struct mddev * mddev,const char * page,size_t len)4879 action_store(struct mddev *mddev, const char *page, size_t len)
4880 {
4881 if (!mddev->pers || !mddev->pers->sync_request)
4882 return -EINVAL;
4883
4884
4885 if (cmd_match(page, "idle"))
4886 idle_sync_thread(mddev);
4887 else if (cmd_match(page, "frozen"))
4888 frozen_sync_thread(mddev);
4889 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4890 return -EBUSY;
4891 else if (cmd_match(page, "resync"))
4892 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4893 else if (cmd_match(page, "recover")) {
4894 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4895 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4896 } else if (cmd_match(page, "reshape")) {
4897 int err;
4898 if (mddev->pers->start_reshape == NULL)
4899 return -EINVAL;
4900 err = mddev_lock(mddev);
4901 if (!err) {
4902 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
4903 err = -EBUSY;
4904 } else if (mddev->reshape_position == MaxSector ||
4905 mddev->pers->check_reshape == NULL ||
4906 mddev->pers->check_reshape(mddev)) {
4907 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4908 err = mddev->pers->start_reshape(mddev);
4909 } else {
4910 /*
4911 * If reshape is still in progress, and
4912 * md_check_recovery() can continue to reshape,
4913 * don't restart reshape because data can be
4914 * corrupted for raid456.
4915 */
4916 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4917 }
4918 mddev_unlock(mddev);
4919 }
4920 if (err)
4921 return err;
4922 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
4923 } else {
4924 if (cmd_match(page, "check"))
4925 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4926 else if (!cmd_match(page, "repair"))
4927 return -EINVAL;
4928 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4929 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4930 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4931 }
4932 if (mddev->ro == MD_AUTO_READ) {
4933 /* A write to sync_action is enough to justify
4934 * canceling read-auto mode
4935 */
4936 mddev->ro = MD_RDWR;
4937 md_wakeup_thread(mddev->sync_thread);
4938 }
4939 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4940 md_wakeup_thread(mddev->thread);
4941 sysfs_notify_dirent_safe(mddev->sysfs_action);
4942 return len;
4943 }
4944
4945 static struct md_sysfs_entry md_scan_mode =
4946 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4947
4948 static ssize_t
last_sync_action_show(struct mddev * mddev,char * page)4949 last_sync_action_show(struct mddev *mddev, char *page)
4950 {
4951 return sprintf(page, "%s\n", mddev->last_sync_action);
4952 }
4953
4954 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4955
4956 static ssize_t
mismatch_cnt_show(struct mddev * mddev,char * page)4957 mismatch_cnt_show(struct mddev *mddev, char *page)
4958 {
4959 return sprintf(page, "%llu\n",
4960 (unsigned long long)
4961 atomic64_read(&mddev->resync_mismatches));
4962 }
4963
4964 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4965
4966 static ssize_t
sync_min_show(struct mddev * mddev,char * page)4967 sync_min_show(struct mddev *mddev, char *page)
4968 {
4969 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4970 mddev->sync_speed_min ? "local": "system");
4971 }
4972
4973 static ssize_t
sync_min_store(struct mddev * mddev,const char * buf,size_t len)4974 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4975 {
4976 unsigned int min;
4977 int rv;
4978
4979 if (strncmp(buf, "system", 6)==0) {
4980 min = 0;
4981 } else {
4982 rv = kstrtouint(buf, 10, &min);
4983 if (rv < 0)
4984 return rv;
4985 if (min == 0)
4986 return -EINVAL;
4987 }
4988 mddev->sync_speed_min = min;
4989 return len;
4990 }
4991
4992 static struct md_sysfs_entry md_sync_min =
4993 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4994
4995 static ssize_t
sync_max_show(struct mddev * mddev,char * page)4996 sync_max_show(struct mddev *mddev, char *page)
4997 {
4998 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4999 mddev->sync_speed_max ? "local": "system");
5000 }
5001
5002 static ssize_t
sync_max_store(struct mddev * mddev,const char * buf,size_t len)5003 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
5004 {
5005 unsigned int max;
5006 int rv;
5007
5008 if (strncmp(buf, "system", 6)==0) {
5009 max = 0;
5010 } else {
5011 rv = kstrtouint(buf, 10, &max);
5012 if (rv < 0)
5013 return rv;
5014 if (max == 0)
5015 return -EINVAL;
5016 }
5017 mddev->sync_speed_max = max;
5018 return len;
5019 }
5020
5021 static struct md_sysfs_entry md_sync_max =
5022 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
5023
5024 static ssize_t
degraded_show(struct mddev * mddev,char * page)5025 degraded_show(struct mddev *mddev, char *page)
5026 {
5027 return sprintf(page, "%d\n", mddev->degraded);
5028 }
5029 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
5030
5031 static ssize_t
sync_force_parallel_show(struct mddev * mddev,char * page)5032 sync_force_parallel_show(struct mddev *mddev, char *page)
5033 {
5034 return sprintf(page, "%d\n", mddev->parallel_resync);
5035 }
5036
5037 static ssize_t
sync_force_parallel_store(struct mddev * mddev,const char * buf,size_t len)5038 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
5039 {
5040 long n;
5041
5042 if (kstrtol(buf, 10, &n))
5043 return -EINVAL;
5044
5045 if (n != 0 && n != 1)
5046 return -EINVAL;
5047
5048 mddev->parallel_resync = n;
5049
5050 if (mddev->sync_thread)
5051 wake_up(&resync_wait);
5052
5053 return len;
5054 }
5055
5056 /* force parallel resync, even with shared block devices */
5057 static struct md_sysfs_entry md_sync_force_parallel =
5058 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
5059 sync_force_parallel_show, sync_force_parallel_store);
5060
5061 static ssize_t
sync_speed_show(struct mddev * mddev,char * page)5062 sync_speed_show(struct mddev *mddev, char *page)
5063 {
5064 unsigned long resync, dt, db;
5065 if (mddev->curr_resync == MD_RESYNC_NONE)
5066 return sprintf(page, "none\n");
5067 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
5068 dt = (jiffies - mddev->resync_mark) / HZ;
5069 if (!dt) dt++;
5070 db = resync - mddev->resync_mark_cnt;
5071 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
5072 }
5073
5074 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
5075
5076 static ssize_t
sync_completed_show(struct mddev * mddev,char * page)5077 sync_completed_show(struct mddev *mddev, char *page)
5078 {
5079 unsigned long long max_sectors, resync;
5080
5081 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5082 return sprintf(page, "none\n");
5083
5084 if (mddev->curr_resync == MD_RESYNC_YIELDED ||
5085 mddev->curr_resync == MD_RESYNC_DELAYED)
5086 return sprintf(page, "delayed\n");
5087
5088 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
5089 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5090 max_sectors = mddev->resync_max_sectors;
5091 else
5092 max_sectors = mddev->dev_sectors;
5093
5094 resync = mddev->curr_resync_completed;
5095 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
5096 }
5097
5098 static struct md_sysfs_entry md_sync_completed =
5099 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
5100
5101 static ssize_t
min_sync_show(struct mddev * mddev,char * page)5102 min_sync_show(struct mddev *mddev, char *page)
5103 {
5104 return sprintf(page, "%llu\n",
5105 (unsigned long long)mddev->resync_min);
5106 }
5107 static ssize_t
min_sync_store(struct mddev * mddev,const char * buf,size_t len)5108 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
5109 {
5110 unsigned long long min;
5111 int err;
5112
5113 if (kstrtoull(buf, 10, &min))
5114 return -EINVAL;
5115
5116 spin_lock(&mddev->lock);
5117 err = -EINVAL;
5118 if (min > mddev->resync_max)
5119 goto out_unlock;
5120
5121 err = -EBUSY;
5122 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5123 goto out_unlock;
5124
5125 /* Round down to multiple of 4K for safety */
5126 mddev->resync_min = round_down(min, 8);
5127 err = 0;
5128
5129 out_unlock:
5130 spin_unlock(&mddev->lock);
5131 return err ?: len;
5132 }
5133
5134 static struct md_sysfs_entry md_min_sync =
5135 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
5136
5137 static ssize_t
max_sync_show(struct mddev * mddev,char * page)5138 max_sync_show(struct mddev *mddev, char *page)
5139 {
5140 if (mddev->resync_max == MaxSector)
5141 return sprintf(page, "max\n");
5142 else
5143 return sprintf(page, "%llu\n",
5144 (unsigned long long)mddev->resync_max);
5145 }
5146 static ssize_t
max_sync_store(struct mddev * mddev,const char * buf,size_t len)5147 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
5148 {
5149 int err;
5150 spin_lock(&mddev->lock);
5151 if (strncmp(buf, "max", 3) == 0)
5152 mddev->resync_max = MaxSector;
5153 else {
5154 unsigned long long max;
5155 int chunk;
5156
5157 err = -EINVAL;
5158 if (kstrtoull(buf, 10, &max))
5159 goto out_unlock;
5160 if (max < mddev->resync_min)
5161 goto out_unlock;
5162
5163 err = -EBUSY;
5164 if (max < mddev->resync_max && md_is_rdwr(mddev) &&
5165 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5166 goto out_unlock;
5167
5168 /* Must be a multiple of chunk_size */
5169 chunk = mddev->chunk_sectors;
5170 if (chunk) {
5171 sector_t temp = max;
5172
5173 err = -EINVAL;
5174 if (sector_div(temp, chunk))
5175 goto out_unlock;
5176 }
5177 mddev->resync_max = max;
5178 }
5179 wake_up(&mddev->recovery_wait);
5180 err = 0;
5181 out_unlock:
5182 spin_unlock(&mddev->lock);
5183 return err ?: len;
5184 }
5185
5186 static struct md_sysfs_entry md_max_sync =
5187 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
5188
5189 static ssize_t
suspend_lo_show(struct mddev * mddev,char * page)5190 suspend_lo_show(struct mddev *mddev, char *page)
5191 {
5192 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
5193 }
5194
5195 static ssize_t
suspend_lo_store(struct mddev * mddev,const char * buf,size_t len)5196 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
5197 {
5198 unsigned long long new;
5199 int err;
5200
5201 err = kstrtoull(buf, 10, &new);
5202 if (err < 0)
5203 return err;
5204 if (new != (sector_t)new)
5205 return -EINVAL;
5206
5207 err = mddev_lock(mddev);
5208 if (err)
5209 return err;
5210 err = -EINVAL;
5211 if (mddev->pers == NULL ||
5212 mddev->pers->quiesce == NULL)
5213 goto unlock;
5214 mddev_suspend(mddev);
5215 mddev->suspend_lo = new;
5216 mddev_resume(mddev);
5217
5218 err = 0;
5219 unlock:
5220 mddev_unlock(mddev);
5221 return err ?: len;
5222 }
5223 static struct md_sysfs_entry md_suspend_lo =
5224 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
5225
5226 static ssize_t
suspend_hi_show(struct mddev * mddev,char * page)5227 suspend_hi_show(struct mddev *mddev, char *page)
5228 {
5229 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
5230 }
5231
5232 static ssize_t
suspend_hi_store(struct mddev * mddev,const char * buf,size_t len)5233 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
5234 {
5235 unsigned long long new;
5236 int err;
5237
5238 err = kstrtoull(buf, 10, &new);
5239 if (err < 0)
5240 return err;
5241 if (new != (sector_t)new)
5242 return -EINVAL;
5243
5244 err = mddev_lock(mddev);
5245 if (err)
5246 return err;
5247 err = -EINVAL;
5248 if (mddev->pers == NULL)
5249 goto unlock;
5250
5251 mddev_suspend(mddev);
5252 mddev->suspend_hi = new;
5253 mddev_resume(mddev);
5254
5255 err = 0;
5256 unlock:
5257 mddev_unlock(mddev);
5258 return err ?: len;
5259 }
5260 static struct md_sysfs_entry md_suspend_hi =
5261 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
5262
5263 static ssize_t
reshape_position_show(struct mddev * mddev,char * page)5264 reshape_position_show(struct mddev *mddev, char *page)
5265 {
5266 if (mddev->reshape_position != MaxSector)
5267 return sprintf(page, "%llu\n",
5268 (unsigned long long)mddev->reshape_position);
5269 strcpy(page, "none\n");
5270 return 5;
5271 }
5272
5273 static ssize_t
reshape_position_store(struct mddev * mddev,const char * buf,size_t len)5274 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
5275 {
5276 struct md_rdev *rdev;
5277 unsigned long long new;
5278 int err;
5279
5280 err = kstrtoull(buf, 10, &new);
5281 if (err < 0)
5282 return err;
5283 if (new != (sector_t)new)
5284 return -EINVAL;
5285 err = mddev_lock(mddev);
5286 if (err)
5287 return err;
5288 err = -EBUSY;
5289 if (mddev->pers)
5290 goto unlock;
5291 mddev->reshape_position = new;
5292 mddev->delta_disks = 0;
5293 mddev->reshape_backwards = 0;
5294 mddev->new_level = mddev->level;
5295 mddev->new_layout = mddev->layout;
5296 mddev->new_chunk_sectors = mddev->chunk_sectors;
5297 rdev_for_each(rdev, mddev)
5298 rdev->new_data_offset = rdev->data_offset;
5299 err = 0;
5300 unlock:
5301 mddev_unlock(mddev);
5302 return err ?: len;
5303 }
5304
5305 static struct md_sysfs_entry md_reshape_position =
5306 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
5307 reshape_position_store);
5308
5309 static ssize_t
reshape_direction_show(struct mddev * mddev,char * page)5310 reshape_direction_show(struct mddev *mddev, char *page)
5311 {
5312 return sprintf(page, "%s\n",
5313 mddev->reshape_backwards ? "backwards" : "forwards");
5314 }
5315
5316 static ssize_t
reshape_direction_store(struct mddev * mddev,const char * buf,size_t len)5317 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
5318 {
5319 int backwards = 0;
5320 int err;
5321
5322 if (cmd_match(buf, "forwards"))
5323 backwards = 0;
5324 else if (cmd_match(buf, "backwards"))
5325 backwards = 1;
5326 else
5327 return -EINVAL;
5328 if (mddev->reshape_backwards == backwards)
5329 return len;
5330
5331 err = mddev_lock(mddev);
5332 if (err)
5333 return err;
5334 /* check if we are allowed to change */
5335 if (mddev->delta_disks)
5336 err = -EBUSY;
5337 else if (mddev->persistent &&
5338 mddev->major_version == 0)
5339 err = -EINVAL;
5340 else
5341 mddev->reshape_backwards = backwards;
5342 mddev_unlock(mddev);
5343 return err ?: len;
5344 }
5345
5346 static struct md_sysfs_entry md_reshape_direction =
5347 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5348 reshape_direction_store);
5349
5350 static ssize_t
array_size_show(struct mddev * mddev,char * page)5351 array_size_show(struct mddev *mddev, char *page)
5352 {
5353 if (mddev->external_size)
5354 return sprintf(page, "%llu\n",
5355 (unsigned long long)mddev->array_sectors/2);
5356 else
5357 return sprintf(page, "default\n");
5358 }
5359
5360 static ssize_t
array_size_store(struct mddev * mddev,const char * buf,size_t len)5361 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5362 {
5363 sector_t sectors;
5364 int err;
5365
5366 err = mddev_lock(mddev);
5367 if (err)
5368 return err;
5369
5370 /* cluster raid doesn't support change array_sectors */
5371 if (mddev_is_clustered(mddev)) {
5372 mddev_unlock(mddev);
5373 return -EINVAL;
5374 }
5375
5376 if (strncmp(buf, "default", 7) == 0) {
5377 if (mddev->pers)
5378 sectors = mddev->pers->size(mddev, 0, 0);
5379 else
5380 sectors = mddev->array_sectors;
5381
5382 mddev->external_size = 0;
5383 } else {
5384 if (strict_blocks_to_sectors(buf, §ors) < 0)
5385 err = -EINVAL;
5386 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5387 err = -E2BIG;
5388 else
5389 mddev->external_size = 1;
5390 }
5391
5392 if (!err) {
5393 mddev->array_sectors = sectors;
5394 if (mddev->pers)
5395 set_capacity_and_notify(mddev->gendisk,
5396 mddev->array_sectors);
5397 }
5398 mddev_unlock(mddev);
5399 return err ?: len;
5400 }
5401
5402 static struct md_sysfs_entry md_array_size =
5403 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5404 array_size_store);
5405
5406 static ssize_t
consistency_policy_show(struct mddev * mddev,char * page)5407 consistency_policy_show(struct mddev *mddev, char *page)
5408 {
5409 int ret;
5410
5411 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5412 ret = sprintf(page, "journal\n");
5413 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5414 ret = sprintf(page, "ppl\n");
5415 } else if (mddev->bitmap) {
5416 ret = sprintf(page, "bitmap\n");
5417 } else if (mddev->pers) {
5418 if (mddev->pers->sync_request)
5419 ret = sprintf(page, "resync\n");
5420 else
5421 ret = sprintf(page, "none\n");
5422 } else {
5423 ret = sprintf(page, "unknown\n");
5424 }
5425
5426 return ret;
5427 }
5428
5429 static ssize_t
consistency_policy_store(struct mddev * mddev,const char * buf,size_t len)5430 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5431 {
5432 int err = 0;
5433
5434 if (mddev->pers) {
5435 if (mddev->pers->change_consistency_policy)
5436 err = mddev->pers->change_consistency_policy(mddev, buf);
5437 else
5438 err = -EBUSY;
5439 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5440 set_bit(MD_HAS_PPL, &mddev->flags);
5441 } else {
5442 err = -EINVAL;
5443 }
5444
5445 return err ? err : len;
5446 }
5447
5448 static struct md_sysfs_entry md_consistency_policy =
5449 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5450 consistency_policy_store);
5451
fail_last_dev_show(struct mddev * mddev,char * page)5452 static ssize_t fail_last_dev_show(struct mddev *mddev, char *page)
5453 {
5454 return sprintf(page, "%d\n", mddev->fail_last_dev);
5455 }
5456
5457 /*
5458 * Setting fail_last_dev to true to allow last device to be forcibly removed
5459 * from RAID1/RAID10.
5460 */
5461 static ssize_t
fail_last_dev_store(struct mddev * mddev,const char * buf,size_t len)5462 fail_last_dev_store(struct mddev *mddev, const char *buf, size_t len)
5463 {
5464 int ret;
5465 bool value;
5466
5467 ret = kstrtobool(buf, &value);
5468 if (ret)
5469 return ret;
5470
5471 if (value != mddev->fail_last_dev)
5472 mddev->fail_last_dev = value;
5473
5474 return len;
5475 }
5476 static struct md_sysfs_entry md_fail_last_dev =
5477 __ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show,
5478 fail_last_dev_store);
5479
serialize_policy_show(struct mddev * mddev,char * page)5480 static ssize_t serialize_policy_show(struct mddev *mddev, char *page)
5481 {
5482 if (mddev->pers == NULL || (mddev->pers->level != 1))
5483 return sprintf(page, "n/a\n");
5484 else
5485 return sprintf(page, "%d\n", mddev->serialize_policy);
5486 }
5487
5488 /*
5489 * Setting serialize_policy to true to enforce write IO is not reordered
5490 * for raid1.
5491 */
5492 static ssize_t
serialize_policy_store(struct mddev * mddev,const char * buf,size_t len)5493 serialize_policy_store(struct mddev *mddev, const char *buf, size_t len)
5494 {
5495 int err;
5496 bool value;
5497
5498 err = kstrtobool(buf, &value);
5499 if (err)
5500 return err;
5501
5502 if (value == mddev->serialize_policy)
5503 return len;
5504
5505 err = mddev_lock(mddev);
5506 if (err)
5507 return err;
5508 if (mddev->pers == NULL || (mddev->pers->level != 1)) {
5509 pr_err("md: serialize_policy is only effective for raid1\n");
5510 err = -EINVAL;
5511 goto unlock;
5512 }
5513
5514 mddev_suspend(mddev);
5515 if (value)
5516 mddev_create_serial_pool(mddev, NULL, true);
5517 else
5518 mddev_destroy_serial_pool(mddev, NULL, true);
5519 mddev->serialize_policy = value;
5520 mddev_resume(mddev);
5521 unlock:
5522 mddev_unlock(mddev);
5523 return err ?: len;
5524 }
5525
5526 static struct md_sysfs_entry md_serialize_policy =
5527 __ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show,
5528 serialize_policy_store);
5529
5530
5531 static struct attribute *md_default_attrs[] = {
5532 &md_level.attr,
5533 &md_layout.attr,
5534 &md_raid_disks.attr,
5535 &md_uuid.attr,
5536 &md_chunk_size.attr,
5537 &md_size.attr,
5538 &md_resync_start.attr,
5539 &md_metadata.attr,
5540 &md_new_device.attr,
5541 &md_safe_delay.attr,
5542 &md_array_state.attr,
5543 &md_reshape_position.attr,
5544 &md_reshape_direction.attr,
5545 &md_array_size.attr,
5546 &max_corr_read_errors.attr,
5547 &md_consistency_policy.attr,
5548 &md_fail_last_dev.attr,
5549 &md_serialize_policy.attr,
5550 NULL,
5551 };
5552
5553 static const struct attribute_group md_default_group = {
5554 .attrs = md_default_attrs,
5555 };
5556
5557 static struct attribute *md_redundancy_attrs[] = {
5558 &md_scan_mode.attr,
5559 &md_last_scan_mode.attr,
5560 &md_mismatches.attr,
5561 &md_sync_min.attr,
5562 &md_sync_max.attr,
5563 &md_sync_speed.attr,
5564 &md_sync_force_parallel.attr,
5565 &md_sync_completed.attr,
5566 &md_min_sync.attr,
5567 &md_max_sync.attr,
5568 &md_suspend_lo.attr,
5569 &md_suspend_hi.attr,
5570 &md_bitmap.attr,
5571 &md_degraded.attr,
5572 NULL,
5573 };
5574 static const struct attribute_group md_redundancy_group = {
5575 .name = NULL,
5576 .attrs = md_redundancy_attrs,
5577 };
5578
5579 static const struct attribute_group *md_attr_groups[] = {
5580 &md_default_group,
5581 &md_bitmap_group,
5582 NULL,
5583 };
5584
5585 static ssize_t
md_attr_show(struct kobject * kobj,struct attribute * attr,char * page)5586 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5587 {
5588 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5589 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5590 ssize_t rv;
5591
5592 if (!entry->show)
5593 return -EIO;
5594 spin_lock(&all_mddevs_lock);
5595 if (!mddev_get(mddev)) {
5596 spin_unlock(&all_mddevs_lock);
5597 return -EBUSY;
5598 }
5599 spin_unlock(&all_mddevs_lock);
5600
5601 rv = entry->show(mddev, page);
5602 mddev_put(mddev);
5603 return rv;
5604 }
5605
5606 static ssize_t
md_attr_store(struct kobject * kobj,struct attribute * attr,const char * page,size_t length)5607 md_attr_store(struct kobject *kobj, struct attribute *attr,
5608 const char *page, size_t length)
5609 {
5610 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5611 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5612 ssize_t rv;
5613
5614 if (!entry->store)
5615 return -EIO;
5616 if (!capable(CAP_SYS_ADMIN))
5617 return -EACCES;
5618 spin_lock(&all_mddevs_lock);
5619 if (!mddev_get(mddev)) {
5620 spin_unlock(&all_mddevs_lock);
5621 return -EBUSY;
5622 }
5623 spin_unlock(&all_mddevs_lock);
5624 rv = entry->store(mddev, page, length);
5625 mddev_put(mddev);
5626 return rv;
5627 }
5628
md_kobj_release(struct kobject * ko)5629 static void md_kobj_release(struct kobject *ko)
5630 {
5631 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5632
5633 if (mddev->sysfs_state)
5634 sysfs_put(mddev->sysfs_state);
5635 if (mddev->sysfs_level)
5636 sysfs_put(mddev->sysfs_level);
5637
5638 del_gendisk(mddev->gendisk);
5639 put_disk(mddev->gendisk);
5640 }
5641
5642 static const struct sysfs_ops md_sysfs_ops = {
5643 .show = md_attr_show,
5644 .store = md_attr_store,
5645 };
5646 static const struct kobj_type md_ktype = {
5647 .release = md_kobj_release,
5648 .sysfs_ops = &md_sysfs_ops,
5649 .default_groups = md_attr_groups,
5650 };
5651
5652 int mdp_major = 0;
5653
mddev_delayed_delete(struct work_struct * ws)5654 static void mddev_delayed_delete(struct work_struct *ws)
5655 {
5656 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5657
5658 kobject_put(&mddev->kobj);
5659 }
5660
no_op(struct percpu_ref * r)5661 static void no_op(struct percpu_ref *r) {}
5662
mddev_init_writes_pending(struct mddev * mddev)5663 int mddev_init_writes_pending(struct mddev *mddev)
5664 {
5665 if (mddev->writes_pending.percpu_count_ptr)
5666 return 0;
5667 if (percpu_ref_init(&mddev->writes_pending, no_op,
5668 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL) < 0)
5669 return -ENOMEM;
5670 /* We want to start with the refcount at zero */
5671 percpu_ref_put(&mddev->writes_pending);
5672 return 0;
5673 }
5674 EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
5675
md_alloc(dev_t dev,char * name)5676 struct mddev *md_alloc(dev_t dev, char *name)
5677 {
5678 /*
5679 * If dev is zero, name is the name of a device to allocate with
5680 * an arbitrary minor number. It will be "md_???"
5681 * If dev is non-zero it must be a device number with a MAJOR of
5682 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5683 * the device is being created by opening a node in /dev.
5684 * If "name" is not NULL, the device is being created by
5685 * writing to /sys/module/md_mod/parameters/new_array.
5686 */
5687 static DEFINE_MUTEX(disks_mutex);
5688 struct mddev *mddev;
5689 struct gendisk *disk;
5690 int partitioned;
5691 int shift;
5692 int unit;
5693 int error ;
5694
5695 /*
5696 * Wait for any previous instance of this device to be completely
5697 * removed (mddev_delayed_delete).
5698 */
5699 flush_workqueue(md_misc_wq);
5700
5701 mutex_lock(&disks_mutex);
5702 mddev = mddev_alloc(dev);
5703 if (IS_ERR(mddev)) {
5704 error = PTR_ERR(mddev);
5705 goto out_unlock;
5706 }
5707
5708 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5709 shift = partitioned ? MdpMinorShift : 0;
5710 unit = MINOR(mddev->unit) >> shift;
5711
5712 if (name && !dev) {
5713 /* Need to ensure that 'name' is not a duplicate.
5714 */
5715 struct mddev *mddev2;
5716 spin_lock(&all_mddevs_lock);
5717
5718 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5719 if (mddev2->gendisk &&
5720 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5721 spin_unlock(&all_mddevs_lock);
5722 error = -EEXIST;
5723 goto out_free_mddev;
5724 }
5725 spin_unlock(&all_mddevs_lock);
5726 }
5727 if (name && dev)
5728 /*
5729 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5730 */
5731 mddev->hold_active = UNTIL_STOP;
5732
5733 error = -ENOMEM;
5734 disk = blk_alloc_disk(NUMA_NO_NODE);
5735 if (!disk)
5736 goto out_free_mddev;
5737
5738 disk->major = MAJOR(mddev->unit);
5739 disk->first_minor = unit << shift;
5740 disk->minors = 1 << shift;
5741 if (name)
5742 strcpy(disk->disk_name, name);
5743 else if (partitioned)
5744 sprintf(disk->disk_name, "md_d%d", unit);
5745 else
5746 sprintf(disk->disk_name, "md%d", unit);
5747 disk->fops = &md_fops;
5748 disk->private_data = mddev;
5749
5750 mddev->queue = disk->queue;
5751 blk_set_stacking_limits(&mddev->queue->limits);
5752 blk_queue_write_cache(mddev->queue, true, true);
5753 disk->events |= DISK_EVENT_MEDIA_CHANGE;
5754 mddev->gendisk = disk;
5755 error = add_disk(disk);
5756 if (error)
5757 goto out_put_disk;
5758
5759 kobject_init(&mddev->kobj, &md_ktype);
5760 error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
5761 if (error) {
5762 /*
5763 * The disk is already live at this point. Clear the hold flag
5764 * and let mddev_put take care of the deletion, as it isn't any
5765 * different from a normal close on last release now.
5766 */
5767 mddev->hold_active = 0;
5768 mutex_unlock(&disks_mutex);
5769 mddev_put(mddev);
5770 return ERR_PTR(error);
5771 }
5772
5773 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5774 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5775 mddev->sysfs_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level");
5776 mutex_unlock(&disks_mutex);
5777 return mddev;
5778
5779 out_put_disk:
5780 put_disk(disk);
5781 out_free_mddev:
5782 mddev_free(mddev);
5783 out_unlock:
5784 mutex_unlock(&disks_mutex);
5785 return ERR_PTR(error);
5786 }
5787
md_alloc_and_put(dev_t dev,char * name)5788 static int md_alloc_and_put(dev_t dev, char *name)
5789 {
5790 struct mddev *mddev = md_alloc(dev, name);
5791
5792 if (IS_ERR(mddev))
5793 return PTR_ERR(mddev);
5794 mddev_put(mddev);
5795 return 0;
5796 }
5797
md_probe(dev_t dev)5798 static void md_probe(dev_t dev)
5799 {
5800 if (MAJOR(dev) == MD_MAJOR && MINOR(dev) >= 512)
5801 return;
5802 if (create_on_open)
5803 md_alloc_and_put(dev, NULL);
5804 }
5805
add_named_array(const char * val,const struct kernel_param * kp)5806 static int add_named_array(const char *val, const struct kernel_param *kp)
5807 {
5808 /*
5809 * val must be "md_*" or "mdNNN".
5810 * For "md_*" we allocate an array with a large free minor number, and
5811 * set the name to val. val must not already be an active name.
5812 * For "mdNNN" we allocate an array with the minor number NNN
5813 * which must not already be in use.
5814 */
5815 int len = strlen(val);
5816 char buf[DISK_NAME_LEN];
5817 unsigned long devnum;
5818
5819 while (len && val[len-1] == '\n')
5820 len--;
5821 if (len >= DISK_NAME_LEN)
5822 return -E2BIG;
5823 strscpy(buf, val, len+1);
5824 if (strncmp(buf, "md_", 3) == 0)
5825 return md_alloc_and_put(0, buf);
5826 if (strncmp(buf, "md", 2) == 0 &&
5827 isdigit(buf[2]) &&
5828 kstrtoul(buf+2, 10, &devnum) == 0 &&
5829 devnum <= MINORMASK)
5830 return md_alloc_and_put(MKDEV(MD_MAJOR, devnum), NULL);
5831
5832 return -EINVAL;
5833 }
5834
md_safemode_timeout(struct timer_list * t)5835 static void md_safemode_timeout(struct timer_list *t)
5836 {
5837 struct mddev *mddev = from_timer(mddev, t, safemode_timer);
5838
5839 mddev->safemode = 1;
5840 if (mddev->external)
5841 sysfs_notify_dirent_safe(mddev->sysfs_state);
5842
5843 md_wakeup_thread(mddev->thread);
5844 }
5845
5846 static int start_dirty_degraded;
active_io_release(struct percpu_ref * ref)5847 static void active_io_release(struct percpu_ref *ref)
5848 {
5849 struct mddev *mddev = container_of(ref, struct mddev, active_io);
5850
5851 wake_up(&mddev->sb_wait);
5852 }
5853
md_run(struct mddev * mddev)5854 int md_run(struct mddev *mddev)
5855 {
5856 int err;
5857 struct md_rdev *rdev;
5858 struct md_personality *pers;
5859 bool nowait = true;
5860
5861 if (list_empty(&mddev->disks))
5862 /* cannot run an array with no devices.. */
5863 return -EINVAL;
5864
5865 if (mddev->pers)
5866 return -EBUSY;
5867 /* Cannot run until previous stop completes properly */
5868 if (mddev->sysfs_active)
5869 return -EBUSY;
5870
5871 /*
5872 * Analyze all RAID superblock(s)
5873 */
5874 if (!mddev->raid_disks) {
5875 if (!mddev->persistent)
5876 return -EINVAL;
5877 err = analyze_sbs(mddev);
5878 if (err)
5879 return -EINVAL;
5880 }
5881
5882 if (mddev->level != LEVEL_NONE)
5883 request_module("md-level-%d", mddev->level);
5884 else if (mddev->clevel[0])
5885 request_module("md-%s", mddev->clevel);
5886
5887 /*
5888 * Drop all container device buffers, from now on
5889 * the only valid external interface is through the md
5890 * device.
5891 */
5892 mddev->has_superblocks = false;
5893 rdev_for_each(rdev, mddev) {
5894 if (test_bit(Faulty, &rdev->flags))
5895 continue;
5896 sync_blockdev(rdev->bdev);
5897 invalidate_bdev(rdev->bdev);
5898 if (mddev->ro != MD_RDONLY && rdev_read_only(rdev)) {
5899 mddev->ro = MD_RDONLY;
5900 if (mddev->gendisk)
5901 set_disk_ro(mddev->gendisk, 1);
5902 }
5903
5904 if (rdev->sb_page)
5905 mddev->has_superblocks = true;
5906
5907 /* perform some consistency tests on the device.
5908 * We don't want the data to overlap the metadata,
5909 * Internal Bitmap issues have been handled elsewhere.
5910 */
5911 if (rdev->meta_bdev) {
5912 /* Nothing to check */;
5913 } else if (rdev->data_offset < rdev->sb_start) {
5914 if (mddev->dev_sectors &&
5915 rdev->data_offset + mddev->dev_sectors
5916 > rdev->sb_start) {
5917 pr_warn("md: %s: data overlaps metadata\n",
5918 mdname(mddev));
5919 return -EINVAL;
5920 }
5921 } else {
5922 if (rdev->sb_start + rdev->sb_size/512
5923 > rdev->data_offset) {
5924 pr_warn("md: %s: metadata overlaps data\n",
5925 mdname(mddev));
5926 return -EINVAL;
5927 }
5928 }
5929 sysfs_notify_dirent_safe(rdev->sysfs_state);
5930 nowait = nowait && bdev_nowait(rdev->bdev);
5931 }
5932
5933 err = percpu_ref_init(&mddev->active_io, active_io_release,
5934 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL);
5935 if (err)
5936 return err;
5937
5938 if (!bioset_initialized(&mddev->bio_set)) {
5939 err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5940 if (err)
5941 goto exit_active_io;
5942 }
5943 if (!bioset_initialized(&mddev->sync_set)) {
5944 err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5945 if (err)
5946 goto exit_bio_set;
5947 }
5948
5949 if (!bioset_initialized(&mddev->io_clone_set)) {
5950 err = bioset_init(&mddev->io_clone_set, BIO_POOL_SIZE,
5951 offsetof(struct md_io_clone, bio_clone), 0);
5952 if (err)
5953 goto exit_sync_set;
5954 }
5955
5956 spin_lock(&pers_lock);
5957 pers = find_pers(mddev->level, mddev->clevel);
5958 if (!pers || !try_module_get(pers->owner)) {
5959 spin_unlock(&pers_lock);
5960 if (mddev->level != LEVEL_NONE)
5961 pr_warn("md: personality for level %d is not loaded!\n",
5962 mddev->level);
5963 else
5964 pr_warn("md: personality for level %s is not loaded!\n",
5965 mddev->clevel);
5966 err = -EINVAL;
5967 goto abort;
5968 }
5969 spin_unlock(&pers_lock);
5970 if (mddev->level != pers->level) {
5971 mddev->level = pers->level;
5972 mddev->new_level = pers->level;
5973 }
5974 strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5975
5976 if (mddev->reshape_position != MaxSector &&
5977 pers->start_reshape == NULL) {
5978 /* This personality cannot handle reshaping... */
5979 module_put(pers->owner);
5980 err = -EINVAL;
5981 goto abort;
5982 }
5983
5984 if (pers->sync_request) {
5985 /* Warn if this is a potentially silly
5986 * configuration.
5987 */
5988 struct md_rdev *rdev2;
5989 int warned = 0;
5990
5991 rdev_for_each(rdev, mddev)
5992 rdev_for_each(rdev2, mddev) {
5993 if (rdev < rdev2 &&
5994 rdev->bdev->bd_disk ==
5995 rdev2->bdev->bd_disk) {
5996 pr_warn("%s: WARNING: %pg appears to be on the same physical disk as %pg.\n",
5997 mdname(mddev),
5998 rdev->bdev,
5999 rdev2->bdev);
6000 warned = 1;
6001 }
6002 }
6003
6004 if (warned)
6005 pr_warn("True protection against single-disk failure might be compromised.\n");
6006 }
6007
6008 mddev->recovery = 0;
6009 /* may be over-ridden by personality */
6010 mddev->resync_max_sectors = mddev->dev_sectors;
6011
6012 mddev->ok_start_degraded = start_dirty_degraded;
6013
6014 if (start_readonly && md_is_rdwr(mddev))
6015 mddev->ro = MD_AUTO_READ; /* read-only, but switch on first write */
6016
6017 err = pers->run(mddev);
6018 if (err)
6019 pr_warn("md: pers->run() failed ...\n");
6020 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
6021 WARN_ONCE(!mddev->external_size,
6022 "%s: default size too small, but 'external_size' not in effect?\n",
6023 __func__);
6024 pr_warn("md: invalid array_size %llu > default size %llu\n",
6025 (unsigned long long)mddev->array_sectors / 2,
6026 (unsigned long long)pers->size(mddev, 0, 0) / 2);
6027 err = -EINVAL;
6028 }
6029 if (err == 0 && pers->sync_request &&
6030 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
6031 struct bitmap *bitmap;
6032
6033 bitmap = md_bitmap_create(mddev, -1);
6034 if (IS_ERR(bitmap)) {
6035 err = PTR_ERR(bitmap);
6036 pr_warn("%s: failed to create bitmap (%d)\n",
6037 mdname(mddev), err);
6038 } else
6039 mddev->bitmap = bitmap;
6040
6041 }
6042 if (err)
6043 goto bitmap_abort;
6044
6045 if (mddev->bitmap_info.max_write_behind > 0) {
6046 bool create_pool = false;
6047
6048 rdev_for_each(rdev, mddev) {
6049 if (test_bit(WriteMostly, &rdev->flags) &&
6050 rdev_init_serial(rdev))
6051 create_pool = true;
6052 }
6053 if (create_pool && mddev->serial_info_pool == NULL) {
6054 mddev->serial_info_pool =
6055 mempool_create_kmalloc_pool(NR_SERIAL_INFOS,
6056 sizeof(struct serial_info));
6057 if (!mddev->serial_info_pool) {
6058 err = -ENOMEM;
6059 goto bitmap_abort;
6060 }
6061 }
6062 }
6063
6064 if (mddev->queue) {
6065 bool nonrot = true;
6066
6067 rdev_for_each(rdev, mddev) {
6068 if (rdev->raid_disk >= 0 && !bdev_nonrot(rdev->bdev)) {
6069 nonrot = false;
6070 break;
6071 }
6072 }
6073 if (mddev->degraded)
6074 nonrot = false;
6075 if (nonrot)
6076 blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
6077 else
6078 blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
6079 blk_queue_flag_set(QUEUE_FLAG_IO_STAT, mddev->queue);
6080
6081 /* Set the NOWAIT flags if all underlying devices support it */
6082 if (nowait)
6083 blk_queue_flag_set(QUEUE_FLAG_NOWAIT, mddev->queue);
6084 }
6085 if (pers->sync_request) {
6086 if (mddev->kobj.sd &&
6087 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
6088 pr_warn("md: cannot register extra attributes for %s\n",
6089 mdname(mddev));
6090 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
6091 mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
6092 mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
6093 } else if (mddev->ro == MD_AUTO_READ)
6094 mddev->ro = MD_RDWR;
6095
6096 atomic_set(&mddev->max_corr_read_errors,
6097 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
6098 mddev->safemode = 0;
6099 if (mddev_is_clustered(mddev))
6100 mddev->safemode_delay = 0;
6101 else
6102 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
6103 mddev->in_sync = 1;
6104 smp_wmb();
6105 spin_lock(&mddev->lock);
6106 mddev->pers = pers;
6107 spin_unlock(&mddev->lock);
6108 rdev_for_each(rdev, mddev)
6109 if (rdev->raid_disk >= 0)
6110 sysfs_link_rdev(mddev, rdev); /* failure here is OK */
6111
6112 if (mddev->degraded && md_is_rdwr(mddev))
6113 /* This ensures that recovering status is reported immediately
6114 * via sysfs - until a lack of spares is confirmed.
6115 */
6116 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6117 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6118
6119 if (mddev->sb_flags)
6120 md_update_sb(mddev, 0);
6121
6122 md_new_event();
6123 return 0;
6124
6125 bitmap_abort:
6126 mddev_detach(mddev);
6127 if (mddev->private)
6128 pers->free(mddev, mddev->private);
6129 mddev->private = NULL;
6130 module_put(pers->owner);
6131 md_bitmap_destroy(mddev);
6132 abort:
6133 bioset_exit(&mddev->io_clone_set);
6134 exit_sync_set:
6135 bioset_exit(&mddev->sync_set);
6136 exit_bio_set:
6137 bioset_exit(&mddev->bio_set);
6138 exit_active_io:
6139 percpu_ref_exit(&mddev->active_io);
6140 return err;
6141 }
6142 EXPORT_SYMBOL_GPL(md_run);
6143
do_md_run(struct mddev * mddev)6144 int do_md_run(struct mddev *mddev)
6145 {
6146 int err;
6147
6148 set_bit(MD_NOT_READY, &mddev->flags);
6149 err = md_run(mddev);
6150 if (err)
6151 goto out;
6152 err = md_bitmap_load(mddev);
6153 if (err) {
6154 md_bitmap_destroy(mddev);
6155 goto out;
6156 }
6157
6158 if (mddev_is_clustered(mddev))
6159 md_allow_write(mddev);
6160
6161 /* run start up tasks that require md_thread */
6162 md_start(mddev);
6163
6164 md_wakeup_thread(mddev->thread);
6165 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
6166
6167 set_capacity_and_notify(mddev->gendisk, mddev->array_sectors);
6168 clear_bit(MD_NOT_READY, &mddev->flags);
6169 mddev->changed = 1;
6170 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
6171 sysfs_notify_dirent_safe(mddev->sysfs_state);
6172 sysfs_notify_dirent_safe(mddev->sysfs_action);
6173 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
6174 out:
6175 clear_bit(MD_NOT_READY, &mddev->flags);
6176 return err;
6177 }
6178
md_start(struct mddev * mddev)6179 int md_start(struct mddev *mddev)
6180 {
6181 int ret = 0;
6182
6183 if (mddev->pers->start) {
6184 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6185 md_wakeup_thread(mddev->thread);
6186 ret = mddev->pers->start(mddev);
6187 clear_bit(MD_RECOVERY_WAIT, &mddev->recovery);
6188 md_wakeup_thread(mddev->sync_thread);
6189 }
6190 return ret;
6191 }
6192 EXPORT_SYMBOL_GPL(md_start);
6193
restart_array(struct mddev * mddev)6194 static int restart_array(struct mddev *mddev)
6195 {
6196 struct gendisk *disk = mddev->gendisk;
6197 struct md_rdev *rdev;
6198 bool has_journal = false;
6199 bool has_readonly = false;
6200
6201 /* Complain if it has no devices */
6202 if (list_empty(&mddev->disks))
6203 return -ENXIO;
6204 if (!mddev->pers)
6205 return -EINVAL;
6206 if (md_is_rdwr(mddev))
6207 return -EBUSY;
6208
6209 rcu_read_lock();
6210 rdev_for_each_rcu(rdev, mddev) {
6211 if (test_bit(Journal, &rdev->flags) &&
6212 !test_bit(Faulty, &rdev->flags))
6213 has_journal = true;
6214 if (rdev_read_only(rdev))
6215 has_readonly = true;
6216 }
6217 rcu_read_unlock();
6218 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
6219 /* Don't restart rw with journal missing/faulty */
6220 return -EINVAL;
6221 if (has_readonly)
6222 return -EROFS;
6223
6224 mddev->safemode = 0;
6225 mddev->ro = MD_RDWR;
6226 set_disk_ro(disk, 0);
6227 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
6228 /* Kick recovery or resync if necessary */
6229 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6230 md_wakeup_thread(mddev->thread);
6231 md_wakeup_thread(mddev->sync_thread);
6232 sysfs_notify_dirent_safe(mddev->sysfs_state);
6233 return 0;
6234 }
6235
md_clean(struct mddev * mddev)6236 static void md_clean(struct mddev *mddev)
6237 {
6238 mddev->array_sectors = 0;
6239 mddev->external_size = 0;
6240 mddev->dev_sectors = 0;
6241 mddev->raid_disks = 0;
6242 mddev->recovery_cp = 0;
6243 mddev->resync_min = 0;
6244 mddev->resync_max = MaxSector;
6245 mddev->reshape_position = MaxSector;
6246 /* we still need mddev->external in export_rdev, do not clear it yet */
6247 mddev->persistent = 0;
6248 mddev->level = LEVEL_NONE;
6249 mddev->clevel[0] = 0;
6250 /*
6251 * Don't clear MD_CLOSING, or mddev can be opened again.
6252 * 'hold_active != 0' means mddev is still in the creation
6253 * process and will be used later.
6254 */
6255 if (mddev->hold_active)
6256 mddev->flags = 0;
6257 else
6258 mddev->flags &= BIT_ULL_MASK(MD_CLOSING);
6259 mddev->sb_flags = 0;
6260 mddev->ro = MD_RDWR;
6261 mddev->metadata_type[0] = 0;
6262 mddev->chunk_sectors = 0;
6263 mddev->ctime = mddev->utime = 0;
6264 mddev->layout = 0;
6265 mddev->max_disks = 0;
6266 mddev->events = 0;
6267 mddev->can_decrease_events = 0;
6268 mddev->delta_disks = 0;
6269 mddev->reshape_backwards = 0;
6270 mddev->new_level = LEVEL_NONE;
6271 mddev->new_layout = 0;
6272 mddev->new_chunk_sectors = 0;
6273 mddev->curr_resync = MD_RESYNC_NONE;
6274 atomic64_set(&mddev->resync_mismatches, 0);
6275 mddev->suspend_lo = mddev->suspend_hi = 0;
6276 mddev->sync_speed_min = mddev->sync_speed_max = 0;
6277 mddev->recovery = 0;
6278 mddev->in_sync = 0;
6279 mddev->changed = 0;
6280 mddev->degraded = 0;
6281 mddev->safemode = 0;
6282 mddev->private = NULL;
6283 mddev->cluster_info = NULL;
6284 mddev->bitmap_info.offset = 0;
6285 mddev->bitmap_info.default_offset = 0;
6286 mddev->bitmap_info.default_space = 0;
6287 mddev->bitmap_info.chunksize = 0;
6288 mddev->bitmap_info.daemon_sleep = 0;
6289 mddev->bitmap_info.max_write_behind = 0;
6290 mddev->bitmap_info.nodes = 0;
6291 }
6292
__md_stop_writes(struct mddev * mddev)6293 static void __md_stop_writes(struct mddev *mddev)
6294 {
6295 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6296 if (work_pending(&mddev->sync_work))
6297 flush_workqueue(md_misc_wq);
6298 if (mddev->sync_thread) {
6299 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6300 md_reap_sync_thread(mddev);
6301 }
6302
6303 del_timer_sync(&mddev->safemode_timer);
6304
6305 if (mddev->pers && mddev->pers->quiesce) {
6306 mddev->pers->quiesce(mddev, 1);
6307 mddev->pers->quiesce(mddev, 0);
6308 }
6309 md_bitmap_flush(mddev);
6310
6311 if (md_is_rdwr(mddev) &&
6312 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
6313 mddev->sb_flags)) {
6314 /* mark array as shutdown cleanly */
6315 if (!mddev_is_clustered(mddev))
6316 mddev->in_sync = 1;
6317 md_update_sb(mddev, 1);
6318 }
6319 /* disable policy to guarantee rdevs free resources for serialization */
6320 mddev->serialize_policy = 0;
6321 mddev_destroy_serial_pool(mddev, NULL, true);
6322 }
6323
md_stop_writes(struct mddev * mddev)6324 void md_stop_writes(struct mddev *mddev)
6325 {
6326 mddev_lock_nointr(mddev);
6327 __md_stop_writes(mddev);
6328 mddev_unlock(mddev);
6329 }
6330 EXPORT_SYMBOL_GPL(md_stop_writes);
6331
mddev_detach(struct mddev * mddev)6332 static void mddev_detach(struct mddev *mddev)
6333 {
6334 md_bitmap_wait_behind_writes(mddev);
6335 if (mddev->pers && mddev->pers->quiesce && !is_md_suspended(mddev)) {
6336 mddev->pers->quiesce(mddev, 1);
6337 mddev->pers->quiesce(mddev, 0);
6338 }
6339 md_unregister_thread(mddev, &mddev->thread);
6340 if (mddev->queue)
6341 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
6342 }
6343
__md_stop(struct mddev * mddev)6344 static void __md_stop(struct mddev *mddev)
6345 {
6346 struct md_personality *pers = mddev->pers;
6347 md_bitmap_destroy(mddev);
6348 mddev_detach(mddev);
6349 /* Ensure ->event_work is done */
6350 if (mddev->event_work.func)
6351 flush_workqueue(md_misc_wq);
6352 spin_lock(&mddev->lock);
6353 mddev->pers = NULL;
6354 spin_unlock(&mddev->lock);
6355 if (mddev->private)
6356 pers->free(mddev, mddev->private);
6357 mddev->private = NULL;
6358 if (pers->sync_request && mddev->to_remove == NULL)
6359 mddev->to_remove = &md_redundancy_group;
6360 module_put(pers->owner);
6361 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6362
6363 percpu_ref_exit(&mddev->active_io);
6364 bioset_exit(&mddev->bio_set);
6365 bioset_exit(&mddev->sync_set);
6366 bioset_exit(&mddev->io_clone_set);
6367 }
6368
md_stop(struct mddev * mddev)6369 void md_stop(struct mddev *mddev)
6370 {
6371 lockdep_assert_held(&mddev->reconfig_mutex);
6372
6373 /* stop the array and free an attached data structures.
6374 * This is called from dm-raid
6375 */
6376 __md_stop_writes(mddev);
6377 __md_stop(mddev);
6378 percpu_ref_exit(&mddev->writes_pending);
6379 }
6380
6381 EXPORT_SYMBOL_GPL(md_stop);
6382
md_set_readonly(struct mddev * mddev,struct block_device * bdev)6383 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
6384 {
6385 int err = 0;
6386 int did_freeze = 0;
6387
6388 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
6389 return -EBUSY;
6390
6391 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6392 did_freeze = 1;
6393 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6394 md_wakeup_thread(mddev->thread);
6395 }
6396 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6397 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6398
6399 /*
6400 * Thread might be blocked waiting for metadata update which will now
6401 * never happen
6402 */
6403 md_wakeup_thread_directly(mddev->sync_thread);
6404
6405 mddev_unlock(mddev);
6406 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
6407 &mddev->recovery));
6408 wait_event(mddev->sb_wait,
6409 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
6410 mddev_lock_nointr(mddev);
6411
6412 mutex_lock(&mddev->open_mutex);
6413 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6414 mddev->sync_thread ||
6415 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6416 pr_warn("md: %s still in use.\n",mdname(mddev));
6417 err = -EBUSY;
6418 goto out;
6419 }
6420
6421 if (mddev->pers) {
6422 __md_stop_writes(mddev);
6423
6424 if (mddev->ro == MD_RDONLY) {
6425 err = -ENXIO;
6426 goto out;
6427 }
6428
6429 mddev->ro = MD_RDONLY;
6430 set_disk_ro(mddev->gendisk, 1);
6431 }
6432
6433 out:
6434 if ((mddev->pers && !err) || did_freeze) {
6435 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6436 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6437 md_wakeup_thread(mddev->thread);
6438 sysfs_notify_dirent_safe(mddev->sysfs_state);
6439 }
6440
6441 mutex_unlock(&mddev->open_mutex);
6442 return err;
6443 }
6444
6445 /* mode:
6446 * 0 - completely stop and dis-assemble array
6447 * 2 - stop but do not disassemble array
6448 */
do_md_stop(struct mddev * mddev,int mode,struct block_device * bdev)6449 static int do_md_stop(struct mddev *mddev, int mode,
6450 struct block_device *bdev)
6451 {
6452 struct gendisk *disk = mddev->gendisk;
6453 struct md_rdev *rdev;
6454 int did_freeze = 0;
6455
6456 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6457 did_freeze = 1;
6458 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6459 md_wakeup_thread(mddev->thread);
6460 }
6461 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6462 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6463
6464 /*
6465 * Thread might be blocked waiting for metadata update which will now
6466 * never happen
6467 */
6468 md_wakeup_thread_directly(mddev->sync_thread);
6469
6470 mddev_unlock(mddev);
6471 wait_event(resync_wait, (mddev->sync_thread == NULL &&
6472 !test_bit(MD_RECOVERY_RUNNING,
6473 &mddev->recovery)));
6474 mddev_lock_nointr(mddev);
6475
6476 mutex_lock(&mddev->open_mutex);
6477 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6478 mddev->sysfs_active ||
6479 mddev->sync_thread ||
6480 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6481 pr_warn("md: %s still in use.\n",mdname(mddev));
6482 mutex_unlock(&mddev->open_mutex);
6483 if (did_freeze) {
6484 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6485 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6486 md_wakeup_thread(mddev->thread);
6487 }
6488 return -EBUSY;
6489 }
6490 if (mddev->pers) {
6491 if (!md_is_rdwr(mddev))
6492 set_disk_ro(disk, 0);
6493
6494 __md_stop_writes(mddev);
6495 __md_stop(mddev);
6496
6497 /* tell userspace to handle 'inactive' */
6498 sysfs_notify_dirent_safe(mddev->sysfs_state);
6499
6500 rdev_for_each(rdev, mddev)
6501 if (rdev->raid_disk >= 0)
6502 sysfs_unlink_rdev(mddev, rdev);
6503
6504 set_capacity_and_notify(disk, 0);
6505 mutex_unlock(&mddev->open_mutex);
6506 mddev->changed = 1;
6507
6508 if (!md_is_rdwr(mddev))
6509 mddev->ro = MD_RDWR;
6510 } else
6511 mutex_unlock(&mddev->open_mutex);
6512 /*
6513 * Free resources if final stop
6514 */
6515 if (mode == 0) {
6516 pr_info("md: %s stopped.\n", mdname(mddev));
6517
6518 if (mddev->bitmap_info.file) {
6519 struct file *f = mddev->bitmap_info.file;
6520 spin_lock(&mddev->lock);
6521 mddev->bitmap_info.file = NULL;
6522 spin_unlock(&mddev->lock);
6523 fput(f);
6524 }
6525 mddev->bitmap_info.offset = 0;
6526
6527 export_array(mddev);
6528
6529 md_clean(mddev);
6530 if (mddev->hold_active == UNTIL_STOP)
6531 mddev->hold_active = 0;
6532 }
6533 md_new_event();
6534 sysfs_notify_dirent_safe(mddev->sysfs_state);
6535 return 0;
6536 }
6537
6538 #ifndef MODULE
autorun_array(struct mddev * mddev)6539 static void autorun_array(struct mddev *mddev)
6540 {
6541 struct md_rdev *rdev;
6542 int err;
6543
6544 if (list_empty(&mddev->disks))
6545 return;
6546
6547 pr_info("md: running: ");
6548
6549 rdev_for_each(rdev, mddev) {
6550 pr_cont("<%pg>", rdev->bdev);
6551 }
6552 pr_cont("\n");
6553
6554 err = do_md_run(mddev);
6555 if (err) {
6556 pr_warn("md: do_md_run() returned %d\n", err);
6557 do_md_stop(mddev, 0, NULL);
6558 }
6559 }
6560
6561 /*
6562 * lets try to run arrays based on all disks that have arrived
6563 * until now. (those are in pending_raid_disks)
6564 *
6565 * the method: pick the first pending disk, collect all disks with
6566 * the same UUID, remove all from the pending list and put them into
6567 * the 'same_array' list. Then order this list based on superblock
6568 * update time (freshest comes first), kick out 'old' disks and
6569 * compare superblocks. If everything's fine then run it.
6570 *
6571 * If "unit" is allocated, then bump its reference count
6572 */
autorun_devices(int part)6573 static void autorun_devices(int part)
6574 {
6575 struct md_rdev *rdev0, *rdev, *tmp;
6576 struct mddev *mddev;
6577
6578 pr_info("md: autorun ...\n");
6579 while (!list_empty(&pending_raid_disks)) {
6580 int unit;
6581 dev_t dev;
6582 LIST_HEAD(candidates);
6583 rdev0 = list_entry(pending_raid_disks.next,
6584 struct md_rdev, same_set);
6585
6586 pr_debug("md: considering %pg ...\n", rdev0->bdev);
6587 INIT_LIST_HEAD(&candidates);
6588 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6589 if (super_90_load(rdev, rdev0, 0) >= 0) {
6590 pr_debug("md: adding %pg ...\n",
6591 rdev->bdev);
6592 list_move(&rdev->same_set, &candidates);
6593 }
6594 /*
6595 * now we have a set of devices, with all of them having
6596 * mostly sane superblocks. It's time to allocate the
6597 * mddev.
6598 */
6599 if (part) {
6600 dev = MKDEV(mdp_major,
6601 rdev0->preferred_minor << MdpMinorShift);
6602 unit = MINOR(dev) >> MdpMinorShift;
6603 } else {
6604 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6605 unit = MINOR(dev);
6606 }
6607 if (rdev0->preferred_minor != unit) {
6608 pr_warn("md: unit number in %pg is bad: %d\n",
6609 rdev0->bdev, rdev0->preferred_minor);
6610 break;
6611 }
6612
6613 mddev = md_alloc(dev, NULL);
6614 if (IS_ERR(mddev))
6615 break;
6616
6617 if (mddev_lock(mddev))
6618 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6619 else if (mddev->raid_disks || mddev->major_version
6620 || !list_empty(&mddev->disks)) {
6621 pr_warn("md: %s already running, cannot run %pg\n",
6622 mdname(mddev), rdev0->bdev);
6623 mddev_unlock(mddev);
6624 } else {
6625 pr_debug("md: created %s\n", mdname(mddev));
6626 mddev->persistent = 1;
6627 rdev_for_each_list(rdev, tmp, &candidates) {
6628 list_del_init(&rdev->same_set);
6629 if (bind_rdev_to_array(rdev, mddev))
6630 export_rdev(rdev, mddev);
6631 }
6632 autorun_array(mddev);
6633 mddev_unlock(mddev);
6634 }
6635 /* on success, candidates will be empty, on error
6636 * it won't...
6637 */
6638 rdev_for_each_list(rdev, tmp, &candidates) {
6639 list_del_init(&rdev->same_set);
6640 export_rdev(rdev, mddev);
6641 }
6642 mddev_put(mddev);
6643 }
6644 pr_info("md: ... autorun DONE.\n");
6645 }
6646 #endif /* !MODULE */
6647
get_version(void __user * arg)6648 static int get_version(void __user *arg)
6649 {
6650 mdu_version_t ver;
6651
6652 ver.major = MD_MAJOR_VERSION;
6653 ver.minor = MD_MINOR_VERSION;
6654 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6655
6656 if (copy_to_user(arg, &ver, sizeof(ver)))
6657 return -EFAULT;
6658
6659 return 0;
6660 }
6661
get_array_info(struct mddev * mddev,void __user * arg)6662 static int get_array_info(struct mddev *mddev, void __user *arg)
6663 {
6664 mdu_array_info_t info;
6665 int nr,working,insync,failed,spare;
6666 struct md_rdev *rdev;
6667
6668 nr = working = insync = failed = spare = 0;
6669 rcu_read_lock();
6670 rdev_for_each_rcu(rdev, mddev) {
6671 nr++;
6672 if (test_bit(Faulty, &rdev->flags))
6673 failed++;
6674 else {
6675 working++;
6676 if (test_bit(In_sync, &rdev->flags))
6677 insync++;
6678 else if (test_bit(Journal, &rdev->flags))
6679 /* TODO: add journal count to md_u.h */
6680 ;
6681 else
6682 spare++;
6683 }
6684 }
6685 rcu_read_unlock();
6686
6687 info.major_version = mddev->major_version;
6688 info.minor_version = mddev->minor_version;
6689 info.patch_version = MD_PATCHLEVEL_VERSION;
6690 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6691 info.level = mddev->level;
6692 info.size = mddev->dev_sectors / 2;
6693 if (info.size != mddev->dev_sectors / 2) /* overflow */
6694 info.size = -1;
6695 info.nr_disks = nr;
6696 info.raid_disks = mddev->raid_disks;
6697 info.md_minor = mddev->md_minor;
6698 info.not_persistent= !mddev->persistent;
6699
6700 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6701 info.state = 0;
6702 if (mddev->in_sync)
6703 info.state = (1<<MD_SB_CLEAN);
6704 if (mddev->bitmap && mddev->bitmap_info.offset)
6705 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6706 if (mddev_is_clustered(mddev))
6707 info.state |= (1<<MD_SB_CLUSTERED);
6708 info.active_disks = insync;
6709 info.working_disks = working;
6710 info.failed_disks = failed;
6711 info.spare_disks = spare;
6712
6713 info.layout = mddev->layout;
6714 info.chunk_size = mddev->chunk_sectors << 9;
6715
6716 if (copy_to_user(arg, &info, sizeof(info)))
6717 return -EFAULT;
6718
6719 return 0;
6720 }
6721
get_bitmap_file(struct mddev * mddev,void __user * arg)6722 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6723 {
6724 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6725 char *ptr;
6726 int err;
6727
6728 file = kzalloc(sizeof(*file), GFP_NOIO);
6729 if (!file)
6730 return -ENOMEM;
6731
6732 err = 0;
6733 spin_lock(&mddev->lock);
6734 /* bitmap enabled */
6735 if (mddev->bitmap_info.file) {
6736 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6737 sizeof(file->pathname));
6738 if (IS_ERR(ptr))
6739 err = PTR_ERR(ptr);
6740 else
6741 memmove(file->pathname, ptr,
6742 sizeof(file->pathname)-(ptr-file->pathname));
6743 }
6744 spin_unlock(&mddev->lock);
6745
6746 if (err == 0 &&
6747 copy_to_user(arg, file, sizeof(*file)))
6748 err = -EFAULT;
6749
6750 kfree(file);
6751 return err;
6752 }
6753
get_disk_info(struct mddev * mddev,void __user * arg)6754 static int get_disk_info(struct mddev *mddev, void __user * arg)
6755 {
6756 mdu_disk_info_t info;
6757 struct md_rdev *rdev;
6758
6759 if (copy_from_user(&info, arg, sizeof(info)))
6760 return -EFAULT;
6761
6762 rcu_read_lock();
6763 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6764 if (rdev) {
6765 info.major = MAJOR(rdev->bdev->bd_dev);
6766 info.minor = MINOR(rdev->bdev->bd_dev);
6767 info.raid_disk = rdev->raid_disk;
6768 info.state = 0;
6769 if (test_bit(Faulty, &rdev->flags))
6770 info.state |= (1<<MD_DISK_FAULTY);
6771 else if (test_bit(In_sync, &rdev->flags)) {
6772 info.state |= (1<<MD_DISK_ACTIVE);
6773 info.state |= (1<<MD_DISK_SYNC);
6774 }
6775 if (test_bit(Journal, &rdev->flags))
6776 info.state |= (1<<MD_DISK_JOURNAL);
6777 if (test_bit(WriteMostly, &rdev->flags))
6778 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6779 if (test_bit(FailFast, &rdev->flags))
6780 info.state |= (1<<MD_DISK_FAILFAST);
6781 } else {
6782 info.major = info.minor = 0;
6783 info.raid_disk = -1;
6784 info.state = (1<<MD_DISK_REMOVED);
6785 }
6786 rcu_read_unlock();
6787
6788 if (copy_to_user(arg, &info, sizeof(info)))
6789 return -EFAULT;
6790
6791 return 0;
6792 }
6793
md_add_new_disk(struct mddev * mddev,struct mdu_disk_info_s * info)6794 int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info)
6795 {
6796 struct md_rdev *rdev;
6797 dev_t dev = MKDEV(info->major,info->minor);
6798
6799 if (mddev_is_clustered(mddev) &&
6800 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6801 pr_warn("%s: Cannot add to clustered mddev.\n",
6802 mdname(mddev));
6803 return -EINVAL;
6804 }
6805
6806 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6807 return -EOVERFLOW;
6808
6809 if (!mddev->raid_disks) {
6810 int err;
6811 /* expecting a device which has a superblock */
6812 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6813 if (IS_ERR(rdev)) {
6814 pr_warn("md: md_import_device returned %ld\n",
6815 PTR_ERR(rdev));
6816 return PTR_ERR(rdev);
6817 }
6818 if (!list_empty(&mddev->disks)) {
6819 struct md_rdev *rdev0
6820 = list_entry(mddev->disks.next,
6821 struct md_rdev, same_set);
6822 err = super_types[mddev->major_version]
6823 .load_super(rdev, rdev0, mddev->minor_version);
6824 if (err < 0) {
6825 pr_warn("md: %pg has different UUID to %pg\n",
6826 rdev->bdev,
6827 rdev0->bdev);
6828 export_rdev(rdev, mddev);
6829 return -EINVAL;
6830 }
6831 }
6832 err = bind_rdev_to_array(rdev, mddev);
6833 if (err)
6834 export_rdev(rdev, mddev);
6835 return err;
6836 }
6837
6838 /*
6839 * md_add_new_disk can be used once the array is assembled
6840 * to add "hot spares". They must already have a superblock
6841 * written
6842 */
6843 if (mddev->pers) {
6844 int err;
6845 if (!mddev->pers->hot_add_disk) {
6846 pr_warn("%s: personality does not support diskops!\n",
6847 mdname(mddev));
6848 return -EINVAL;
6849 }
6850 if (mddev->persistent)
6851 rdev = md_import_device(dev, mddev->major_version,
6852 mddev->minor_version);
6853 else
6854 rdev = md_import_device(dev, -1, -1);
6855 if (IS_ERR(rdev)) {
6856 pr_warn("md: md_import_device returned %ld\n",
6857 PTR_ERR(rdev));
6858 return PTR_ERR(rdev);
6859 }
6860 /* set saved_raid_disk if appropriate */
6861 if (!mddev->persistent) {
6862 if (info->state & (1<<MD_DISK_SYNC) &&
6863 info->raid_disk < mddev->raid_disks) {
6864 rdev->raid_disk = info->raid_disk;
6865 clear_bit(Bitmap_sync, &rdev->flags);
6866 } else
6867 rdev->raid_disk = -1;
6868 rdev->saved_raid_disk = rdev->raid_disk;
6869 } else
6870 super_types[mddev->major_version].
6871 validate_super(mddev, NULL/*freshest*/, rdev);
6872 if ((info->state & (1<<MD_DISK_SYNC)) &&
6873 rdev->raid_disk != info->raid_disk) {
6874 /* This was a hot-add request, but events doesn't
6875 * match, so reject it.
6876 */
6877 export_rdev(rdev, mddev);
6878 return -EINVAL;
6879 }
6880
6881 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6882 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6883 set_bit(WriteMostly, &rdev->flags);
6884 else
6885 clear_bit(WriteMostly, &rdev->flags);
6886 if (info->state & (1<<MD_DISK_FAILFAST))
6887 set_bit(FailFast, &rdev->flags);
6888 else
6889 clear_bit(FailFast, &rdev->flags);
6890
6891 if (info->state & (1<<MD_DISK_JOURNAL)) {
6892 struct md_rdev *rdev2;
6893 bool has_journal = false;
6894
6895 /* make sure no existing journal disk */
6896 rdev_for_each(rdev2, mddev) {
6897 if (test_bit(Journal, &rdev2->flags)) {
6898 has_journal = true;
6899 break;
6900 }
6901 }
6902 if (has_journal || mddev->bitmap) {
6903 export_rdev(rdev, mddev);
6904 return -EBUSY;
6905 }
6906 set_bit(Journal, &rdev->flags);
6907 }
6908 /*
6909 * check whether the device shows up in other nodes
6910 */
6911 if (mddev_is_clustered(mddev)) {
6912 if (info->state & (1 << MD_DISK_CANDIDATE))
6913 set_bit(Candidate, &rdev->flags);
6914 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6915 /* --add initiated by this node */
6916 err = md_cluster_ops->add_new_disk(mddev, rdev);
6917 if (err) {
6918 export_rdev(rdev, mddev);
6919 return err;
6920 }
6921 }
6922 }
6923
6924 rdev->raid_disk = -1;
6925 err = bind_rdev_to_array(rdev, mddev);
6926
6927 if (err)
6928 export_rdev(rdev, mddev);
6929
6930 if (mddev_is_clustered(mddev)) {
6931 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6932 if (!err) {
6933 err = md_cluster_ops->new_disk_ack(mddev,
6934 err == 0);
6935 if (err)
6936 md_kick_rdev_from_array(rdev);
6937 }
6938 } else {
6939 if (err)
6940 md_cluster_ops->add_new_disk_cancel(mddev);
6941 else
6942 err = add_bound_rdev(rdev);
6943 }
6944
6945 } else if (!err)
6946 err = add_bound_rdev(rdev);
6947
6948 return err;
6949 }
6950
6951 /* otherwise, md_add_new_disk is only allowed
6952 * for major_version==0 superblocks
6953 */
6954 if (mddev->major_version != 0) {
6955 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6956 return -EINVAL;
6957 }
6958
6959 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6960 int err;
6961 rdev = md_import_device(dev, -1, 0);
6962 if (IS_ERR(rdev)) {
6963 pr_warn("md: error, md_import_device() returned %ld\n",
6964 PTR_ERR(rdev));
6965 return PTR_ERR(rdev);
6966 }
6967 rdev->desc_nr = info->number;
6968 if (info->raid_disk < mddev->raid_disks)
6969 rdev->raid_disk = info->raid_disk;
6970 else
6971 rdev->raid_disk = -1;
6972
6973 if (rdev->raid_disk < mddev->raid_disks)
6974 if (info->state & (1<<MD_DISK_SYNC))
6975 set_bit(In_sync, &rdev->flags);
6976
6977 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6978 set_bit(WriteMostly, &rdev->flags);
6979 if (info->state & (1<<MD_DISK_FAILFAST))
6980 set_bit(FailFast, &rdev->flags);
6981
6982 if (!mddev->persistent) {
6983 pr_debug("md: nonpersistent superblock ...\n");
6984 rdev->sb_start = bdev_nr_sectors(rdev->bdev);
6985 } else
6986 rdev->sb_start = calc_dev_sboffset(rdev);
6987 rdev->sectors = rdev->sb_start;
6988
6989 err = bind_rdev_to_array(rdev, mddev);
6990 if (err) {
6991 export_rdev(rdev, mddev);
6992 return err;
6993 }
6994 }
6995
6996 return 0;
6997 }
6998
hot_remove_disk(struct mddev * mddev,dev_t dev)6999 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
7000 {
7001 struct md_rdev *rdev;
7002
7003 if (!mddev->pers)
7004 return -ENODEV;
7005
7006 rdev = find_rdev(mddev, dev);
7007 if (!rdev)
7008 return -ENXIO;
7009
7010 if (rdev->raid_disk < 0)
7011 goto kick_rdev;
7012
7013 clear_bit(Blocked, &rdev->flags);
7014 remove_and_add_spares(mddev, rdev);
7015
7016 if (rdev->raid_disk >= 0)
7017 goto busy;
7018
7019 kick_rdev:
7020 if (mddev_is_clustered(mddev)) {
7021 if (md_cluster_ops->remove_disk(mddev, rdev))
7022 goto busy;
7023 }
7024
7025 md_kick_rdev_from_array(rdev);
7026 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7027 if (mddev->thread)
7028 md_wakeup_thread(mddev->thread);
7029 else
7030 md_update_sb(mddev, 1);
7031 md_new_event();
7032
7033 return 0;
7034 busy:
7035 pr_debug("md: cannot remove active disk %pg from %s ...\n",
7036 rdev->bdev, mdname(mddev));
7037 return -EBUSY;
7038 }
7039
hot_add_disk(struct mddev * mddev,dev_t dev)7040 static int hot_add_disk(struct mddev *mddev, dev_t dev)
7041 {
7042 int err;
7043 struct md_rdev *rdev;
7044
7045 if (!mddev->pers)
7046 return -ENODEV;
7047
7048 if (mddev->major_version != 0) {
7049 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
7050 mdname(mddev));
7051 return -EINVAL;
7052 }
7053 if (!mddev->pers->hot_add_disk) {
7054 pr_warn("%s: personality does not support diskops!\n",
7055 mdname(mddev));
7056 return -EINVAL;
7057 }
7058
7059 rdev = md_import_device(dev, -1, 0);
7060 if (IS_ERR(rdev)) {
7061 pr_warn("md: error, md_import_device() returned %ld\n",
7062 PTR_ERR(rdev));
7063 return -EINVAL;
7064 }
7065
7066 if (mddev->persistent)
7067 rdev->sb_start = calc_dev_sboffset(rdev);
7068 else
7069 rdev->sb_start = bdev_nr_sectors(rdev->bdev);
7070
7071 rdev->sectors = rdev->sb_start;
7072
7073 if (test_bit(Faulty, &rdev->flags)) {
7074 pr_warn("md: can not hot-add faulty %pg disk to %s!\n",
7075 rdev->bdev, mdname(mddev));
7076 err = -EINVAL;
7077 goto abort_export;
7078 }
7079
7080 clear_bit(In_sync, &rdev->flags);
7081 rdev->desc_nr = -1;
7082 rdev->saved_raid_disk = -1;
7083 err = bind_rdev_to_array(rdev, mddev);
7084 if (err)
7085 goto abort_export;
7086
7087 /*
7088 * The rest should better be atomic, we can have disk failures
7089 * noticed in interrupt contexts ...
7090 */
7091
7092 rdev->raid_disk = -1;
7093
7094 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7095 if (!mddev->thread)
7096 md_update_sb(mddev, 1);
7097 /*
7098 * If the new disk does not support REQ_NOWAIT,
7099 * disable on the whole MD.
7100 */
7101 if (!bdev_nowait(rdev->bdev)) {
7102 pr_info("%s: Disabling nowait because %pg does not support nowait\n",
7103 mdname(mddev), rdev->bdev);
7104 blk_queue_flag_clear(QUEUE_FLAG_NOWAIT, mddev->queue);
7105 }
7106 /*
7107 * Kick recovery, maybe this spare has to be added to the
7108 * array immediately.
7109 */
7110 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7111 md_wakeup_thread(mddev->thread);
7112 md_new_event();
7113 return 0;
7114
7115 abort_export:
7116 export_rdev(rdev, mddev);
7117 return err;
7118 }
7119
set_bitmap_file(struct mddev * mddev,int fd)7120 static int set_bitmap_file(struct mddev *mddev, int fd)
7121 {
7122 int err = 0;
7123
7124 if (mddev->pers) {
7125 if (!mddev->pers->quiesce || !mddev->thread)
7126 return -EBUSY;
7127 if (mddev->recovery || mddev->sync_thread)
7128 return -EBUSY;
7129 /* we should be able to change the bitmap.. */
7130 }
7131
7132 if (fd >= 0) {
7133 struct inode *inode;
7134 struct file *f;
7135
7136 if (mddev->bitmap || mddev->bitmap_info.file)
7137 return -EEXIST; /* cannot add when bitmap is present */
7138
7139 if (!IS_ENABLED(CONFIG_MD_BITMAP_FILE)) {
7140 pr_warn("%s: bitmap files not supported by this kernel\n",
7141 mdname(mddev));
7142 return -EINVAL;
7143 }
7144 pr_warn("%s: using deprecated bitmap file support\n",
7145 mdname(mddev));
7146
7147 f = fget(fd);
7148
7149 if (f == NULL) {
7150 pr_warn("%s: error: failed to get bitmap file\n",
7151 mdname(mddev));
7152 return -EBADF;
7153 }
7154
7155 inode = f->f_mapping->host;
7156 if (!S_ISREG(inode->i_mode)) {
7157 pr_warn("%s: error: bitmap file must be a regular file\n",
7158 mdname(mddev));
7159 err = -EBADF;
7160 } else if (!(f->f_mode & FMODE_WRITE)) {
7161 pr_warn("%s: error: bitmap file must open for write\n",
7162 mdname(mddev));
7163 err = -EBADF;
7164 } else if (atomic_read(&inode->i_writecount) != 1) {
7165 pr_warn("%s: error: bitmap file is already in use\n",
7166 mdname(mddev));
7167 err = -EBUSY;
7168 }
7169 if (err) {
7170 fput(f);
7171 return err;
7172 }
7173 mddev->bitmap_info.file = f;
7174 mddev->bitmap_info.offset = 0; /* file overrides offset */
7175 } else if (mddev->bitmap == NULL)
7176 return -ENOENT; /* cannot remove what isn't there */
7177 err = 0;
7178 if (mddev->pers) {
7179 if (fd >= 0) {
7180 struct bitmap *bitmap;
7181
7182 bitmap = md_bitmap_create(mddev, -1);
7183 mddev_suspend(mddev);
7184 if (!IS_ERR(bitmap)) {
7185 mddev->bitmap = bitmap;
7186 err = md_bitmap_load(mddev);
7187 } else
7188 err = PTR_ERR(bitmap);
7189 if (err) {
7190 md_bitmap_destroy(mddev);
7191 fd = -1;
7192 }
7193 mddev_resume(mddev);
7194 } else if (fd < 0) {
7195 mddev_suspend(mddev);
7196 md_bitmap_destroy(mddev);
7197 mddev_resume(mddev);
7198 }
7199 }
7200 if (fd < 0) {
7201 struct file *f = mddev->bitmap_info.file;
7202 if (f) {
7203 spin_lock(&mddev->lock);
7204 mddev->bitmap_info.file = NULL;
7205 spin_unlock(&mddev->lock);
7206 fput(f);
7207 }
7208 }
7209
7210 return err;
7211 }
7212
7213 /*
7214 * md_set_array_info is used two different ways
7215 * The original usage is when creating a new array.
7216 * In this usage, raid_disks is > 0 and it together with
7217 * level, size, not_persistent,layout,chunksize determine the
7218 * shape of the array.
7219 * This will always create an array with a type-0.90.0 superblock.
7220 * The newer usage is when assembling an array.
7221 * In this case raid_disks will be 0, and the major_version field is
7222 * use to determine which style super-blocks are to be found on the devices.
7223 * The minor and patch _version numbers are also kept incase the
7224 * super_block handler wishes to interpret them.
7225 */
md_set_array_info(struct mddev * mddev,struct mdu_array_info_s * info)7226 int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info)
7227 {
7228 if (info->raid_disks == 0) {
7229 /* just setting version number for superblock loading */
7230 if (info->major_version < 0 ||
7231 info->major_version >= ARRAY_SIZE(super_types) ||
7232 super_types[info->major_version].name == NULL) {
7233 /* maybe try to auto-load a module? */
7234 pr_warn("md: superblock version %d not known\n",
7235 info->major_version);
7236 return -EINVAL;
7237 }
7238 mddev->major_version = info->major_version;
7239 mddev->minor_version = info->minor_version;
7240 mddev->patch_version = info->patch_version;
7241 mddev->persistent = !info->not_persistent;
7242 /* ensure mddev_put doesn't delete this now that there
7243 * is some minimal configuration.
7244 */
7245 mddev->ctime = ktime_get_real_seconds();
7246 return 0;
7247 }
7248 mddev->major_version = MD_MAJOR_VERSION;
7249 mddev->minor_version = MD_MINOR_VERSION;
7250 mddev->patch_version = MD_PATCHLEVEL_VERSION;
7251 mddev->ctime = ktime_get_real_seconds();
7252
7253 mddev->level = info->level;
7254 mddev->clevel[0] = 0;
7255 mddev->dev_sectors = 2 * (sector_t)info->size;
7256 mddev->raid_disks = info->raid_disks;
7257 /* don't set md_minor, it is determined by which /dev/md* was
7258 * openned
7259 */
7260 if (info->state & (1<<MD_SB_CLEAN))
7261 mddev->recovery_cp = MaxSector;
7262 else
7263 mddev->recovery_cp = 0;
7264 mddev->persistent = ! info->not_persistent;
7265 mddev->external = 0;
7266
7267 mddev->layout = info->layout;
7268 if (mddev->level == 0)
7269 /* Cannot trust RAID0 layout info here */
7270 mddev->layout = -1;
7271 mddev->chunk_sectors = info->chunk_size >> 9;
7272
7273 if (mddev->persistent) {
7274 mddev->max_disks = MD_SB_DISKS;
7275 mddev->flags = 0;
7276 mddev->sb_flags = 0;
7277 }
7278 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
7279
7280 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
7281 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
7282 mddev->bitmap_info.offset = 0;
7283
7284 mddev->reshape_position = MaxSector;
7285
7286 /*
7287 * Generate a 128 bit UUID
7288 */
7289 get_random_bytes(mddev->uuid, 16);
7290
7291 mddev->new_level = mddev->level;
7292 mddev->new_chunk_sectors = mddev->chunk_sectors;
7293 mddev->new_layout = mddev->layout;
7294 mddev->delta_disks = 0;
7295 mddev->reshape_backwards = 0;
7296
7297 return 0;
7298 }
7299
md_set_array_sectors(struct mddev * mddev,sector_t array_sectors)7300 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
7301 {
7302 lockdep_assert_held(&mddev->reconfig_mutex);
7303
7304 if (mddev->external_size)
7305 return;
7306
7307 mddev->array_sectors = array_sectors;
7308 }
7309 EXPORT_SYMBOL(md_set_array_sectors);
7310
update_size(struct mddev * mddev,sector_t num_sectors)7311 static int update_size(struct mddev *mddev, sector_t num_sectors)
7312 {
7313 struct md_rdev *rdev;
7314 int rv;
7315 int fit = (num_sectors == 0);
7316 sector_t old_dev_sectors = mddev->dev_sectors;
7317
7318 if (mddev->pers->resize == NULL)
7319 return -EINVAL;
7320 /* The "num_sectors" is the number of sectors of each device that
7321 * is used. This can only make sense for arrays with redundancy.
7322 * linear and raid0 always use whatever space is available. We can only
7323 * consider changing this number if no resync or reconstruction is
7324 * happening, and if the new size is acceptable. It must fit before the
7325 * sb_start or, if that is <data_offset, it must fit before the size
7326 * of each device. If num_sectors is zero, we find the largest size
7327 * that fits.
7328 */
7329 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7330 mddev->sync_thread)
7331 return -EBUSY;
7332 if (!md_is_rdwr(mddev))
7333 return -EROFS;
7334
7335 rdev_for_each(rdev, mddev) {
7336 sector_t avail = rdev->sectors;
7337
7338 if (fit && (num_sectors == 0 || num_sectors > avail))
7339 num_sectors = avail;
7340 if (avail < num_sectors)
7341 return -ENOSPC;
7342 }
7343 rv = mddev->pers->resize(mddev, num_sectors);
7344 if (!rv) {
7345 if (mddev_is_clustered(mddev))
7346 md_cluster_ops->update_size(mddev, old_dev_sectors);
7347 else if (mddev->queue) {
7348 set_capacity_and_notify(mddev->gendisk,
7349 mddev->array_sectors);
7350 }
7351 }
7352 return rv;
7353 }
7354
update_raid_disks(struct mddev * mddev,int raid_disks)7355 static int update_raid_disks(struct mddev *mddev, int raid_disks)
7356 {
7357 int rv;
7358 struct md_rdev *rdev;
7359 /* change the number of raid disks */
7360 if (mddev->pers->check_reshape == NULL)
7361 return -EINVAL;
7362 if (!md_is_rdwr(mddev))
7363 return -EROFS;
7364 if (raid_disks <= 0 ||
7365 (mddev->max_disks && raid_disks >= mddev->max_disks))
7366 return -EINVAL;
7367 if (mddev->sync_thread ||
7368 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7369 test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) ||
7370 mddev->reshape_position != MaxSector)
7371 return -EBUSY;
7372
7373 rdev_for_each(rdev, mddev) {
7374 if (mddev->raid_disks < raid_disks &&
7375 rdev->data_offset < rdev->new_data_offset)
7376 return -EINVAL;
7377 if (mddev->raid_disks > raid_disks &&
7378 rdev->data_offset > rdev->new_data_offset)
7379 return -EINVAL;
7380 }
7381
7382 mddev->delta_disks = raid_disks - mddev->raid_disks;
7383 if (mddev->delta_disks < 0)
7384 mddev->reshape_backwards = 1;
7385 else if (mddev->delta_disks > 0)
7386 mddev->reshape_backwards = 0;
7387
7388 rv = mddev->pers->check_reshape(mddev);
7389 if (rv < 0) {
7390 mddev->delta_disks = 0;
7391 mddev->reshape_backwards = 0;
7392 }
7393 return rv;
7394 }
7395
7396 /*
7397 * update_array_info is used to change the configuration of an
7398 * on-line array.
7399 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
7400 * fields in the info are checked against the array.
7401 * Any differences that cannot be handled will cause an error.
7402 * Normally, only one change can be managed at a time.
7403 */
update_array_info(struct mddev * mddev,mdu_array_info_t * info)7404 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
7405 {
7406 int rv = 0;
7407 int cnt = 0;
7408 int state = 0;
7409
7410 /* calculate expected state,ignoring low bits */
7411 if (mddev->bitmap && mddev->bitmap_info.offset)
7412 state |= (1 << MD_SB_BITMAP_PRESENT);
7413
7414 if (mddev->major_version != info->major_version ||
7415 mddev->minor_version != info->minor_version ||
7416 /* mddev->patch_version != info->patch_version || */
7417 mddev->ctime != info->ctime ||
7418 mddev->level != info->level ||
7419 /* mddev->layout != info->layout || */
7420 mddev->persistent != !info->not_persistent ||
7421 mddev->chunk_sectors != info->chunk_size >> 9 ||
7422 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7423 ((state^info->state) & 0xfffffe00)
7424 )
7425 return -EINVAL;
7426 /* Check there is only one change */
7427 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7428 cnt++;
7429 if (mddev->raid_disks != info->raid_disks)
7430 cnt++;
7431 if (mddev->layout != info->layout)
7432 cnt++;
7433 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
7434 cnt++;
7435 if (cnt == 0)
7436 return 0;
7437 if (cnt > 1)
7438 return -EINVAL;
7439
7440 if (mddev->layout != info->layout) {
7441 /* Change layout
7442 * we don't need to do anything at the md level, the
7443 * personality will take care of it all.
7444 */
7445 if (mddev->pers->check_reshape == NULL)
7446 return -EINVAL;
7447 else {
7448 mddev->new_layout = info->layout;
7449 rv = mddev->pers->check_reshape(mddev);
7450 if (rv)
7451 mddev->new_layout = mddev->layout;
7452 return rv;
7453 }
7454 }
7455 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7456 rv = update_size(mddev, (sector_t)info->size * 2);
7457
7458 if (mddev->raid_disks != info->raid_disks)
7459 rv = update_raid_disks(mddev, info->raid_disks);
7460
7461 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
7462 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
7463 rv = -EINVAL;
7464 goto err;
7465 }
7466 if (mddev->recovery || mddev->sync_thread) {
7467 rv = -EBUSY;
7468 goto err;
7469 }
7470 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
7471 struct bitmap *bitmap;
7472 /* add the bitmap */
7473 if (mddev->bitmap) {
7474 rv = -EEXIST;
7475 goto err;
7476 }
7477 if (mddev->bitmap_info.default_offset == 0) {
7478 rv = -EINVAL;
7479 goto err;
7480 }
7481 mddev->bitmap_info.offset =
7482 mddev->bitmap_info.default_offset;
7483 mddev->bitmap_info.space =
7484 mddev->bitmap_info.default_space;
7485 bitmap = md_bitmap_create(mddev, -1);
7486 mddev_suspend(mddev);
7487 if (!IS_ERR(bitmap)) {
7488 mddev->bitmap = bitmap;
7489 rv = md_bitmap_load(mddev);
7490 } else
7491 rv = PTR_ERR(bitmap);
7492 if (rv)
7493 md_bitmap_destroy(mddev);
7494 mddev_resume(mddev);
7495 } else {
7496 /* remove the bitmap */
7497 if (!mddev->bitmap) {
7498 rv = -ENOENT;
7499 goto err;
7500 }
7501 if (mddev->bitmap->storage.file) {
7502 rv = -EINVAL;
7503 goto err;
7504 }
7505 if (mddev->bitmap_info.nodes) {
7506 /* hold PW on all the bitmap lock */
7507 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7508 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7509 rv = -EPERM;
7510 md_cluster_ops->unlock_all_bitmaps(mddev);
7511 goto err;
7512 }
7513
7514 mddev->bitmap_info.nodes = 0;
7515 md_cluster_ops->leave(mddev);
7516 module_put(md_cluster_mod);
7517 mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
7518 }
7519 mddev_suspend(mddev);
7520 md_bitmap_destroy(mddev);
7521 mddev_resume(mddev);
7522 mddev->bitmap_info.offset = 0;
7523 }
7524 }
7525 md_update_sb(mddev, 1);
7526 return rv;
7527 err:
7528 return rv;
7529 }
7530
set_disk_faulty(struct mddev * mddev,dev_t dev)7531 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7532 {
7533 struct md_rdev *rdev;
7534 int err = 0;
7535
7536 if (mddev->pers == NULL)
7537 return -ENODEV;
7538
7539 rcu_read_lock();
7540 rdev = md_find_rdev_rcu(mddev, dev);
7541 if (!rdev)
7542 err = -ENODEV;
7543 else {
7544 md_error(mddev, rdev);
7545 if (test_bit(MD_BROKEN, &mddev->flags))
7546 err = -EBUSY;
7547 }
7548 rcu_read_unlock();
7549 return err;
7550 }
7551
7552 /*
7553 * We have a problem here : there is no easy way to give a CHS
7554 * virtual geometry. We currently pretend that we have a 2 heads
7555 * 4 sectors (with a BIG number of cylinders...). This drives
7556 * dosfs just mad... ;-)
7557 */
md_getgeo(struct block_device * bdev,struct hd_geometry * geo)7558 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7559 {
7560 struct mddev *mddev = bdev->bd_disk->private_data;
7561
7562 geo->heads = 2;
7563 geo->sectors = 4;
7564 geo->cylinders = mddev->array_sectors / 8;
7565 return 0;
7566 }
7567
md_ioctl_valid(unsigned int cmd)7568 static inline bool md_ioctl_valid(unsigned int cmd)
7569 {
7570 switch (cmd) {
7571 case ADD_NEW_DISK:
7572 case GET_ARRAY_INFO:
7573 case GET_BITMAP_FILE:
7574 case GET_DISK_INFO:
7575 case HOT_ADD_DISK:
7576 case HOT_REMOVE_DISK:
7577 case RAID_VERSION:
7578 case RESTART_ARRAY_RW:
7579 case RUN_ARRAY:
7580 case SET_ARRAY_INFO:
7581 case SET_BITMAP_FILE:
7582 case SET_DISK_FAULTY:
7583 case STOP_ARRAY:
7584 case STOP_ARRAY_RO:
7585 case CLUSTERED_DISK_NACK:
7586 return true;
7587 default:
7588 return false;
7589 }
7590 }
7591
__md_set_array_info(struct mddev * mddev,void __user * argp)7592 static int __md_set_array_info(struct mddev *mddev, void __user *argp)
7593 {
7594 mdu_array_info_t info;
7595 int err;
7596
7597 if (!argp)
7598 memset(&info, 0, sizeof(info));
7599 else if (copy_from_user(&info, argp, sizeof(info)))
7600 return -EFAULT;
7601
7602 if (mddev->pers) {
7603 err = update_array_info(mddev, &info);
7604 if (err)
7605 pr_warn("md: couldn't update array info. %d\n", err);
7606 return err;
7607 }
7608
7609 if (!list_empty(&mddev->disks)) {
7610 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7611 return -EBUSY;
7612 }
7613
7614 if (mddev->raid_disks) {
7615 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7616 return -EBUSY;
7617 }
7618
7619 err = md_set_array_info(mddev, &info);
7620 if (err)
7621 pr_warn("md: couldn't set array info. %d\n", err);
7622
7623 return err;
7624 }
7625
md_ioctl(struct block_device * bdev,blk_mode_t mode,unsigned int cmd,unsigned long arg)7626 static int md_ioctl(struct block_device *bdev, blk_mode_t mode,
7627 unsigned int cmd, unsigned long arg)
7628 {
7629 int err = 0;
7630 void __user *argp = (void __user *)arg;
7631 struct mddev *mddev = NULL;
7632
7633 if (!md_ioctl_valid(cmd))
7634 return -ENOTTY;
7635
7636 switch (cmd) {
7637 case RAID_VERSION:
7638 case GET_ARRAY_INFO:
7639 case GET_DISK_INFO:
7640 break;
7641 default:
7642 if (!capable(CAP_SYS_ADMIN))
7643 return -EACCES;
7644 }
7645
7646 /*
7647 * Commands dealing with the RAID driver but not any
7648 * particular array:
7649 */
7650 switch (cmd) {
7651 case RAID_VERSION:
7652 err = get_version(argp);
7653 goto out;
7654 default:;
7655 }
7656
7657 /*
7658 * Commands creating/starting a new array:
7659 */
7660
7661 mddev = bdev->bd_disk->private_data;
7662
7663 /* Some actions do not requires the mutex */
7664 switch (cmd) {
7665 case GET_ARRAY_INFO:
7666 if (!mddev->raid_disks && !mddev->external)
7667 err = -ENODEV;
7668 else
7669 err = get_array_info(mddev, argp);
7670 goto out;
7671
7672 case GET_DISK_INFO:
7673 if (!mddev->raid_disks && !mddev->external)
7674 err = -ENODEV;
7675 else
7676 err = get_disk_info(mddev, argp);
7677 goto out;
7678
7679 case SET_DISK_FAULTY:
7680 err = set_disk_faulty(mddev, new_decode_dev(arg));
7681 goto out;
7682
7683 case GET_BITMAP_FILE:
7684 err = get_bitmap_file(mddev, argp);
7685 goto out;
7686
7687 }
7688
7689 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7690 /* Need to flush page cache, and ensure no-one else opens
7691 * and writes
7692 */
7693 mutex_lock(&mddev->open_mutex);
7694 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7695 mutex_unlock(&mddev->open_mutex);
7696 err = -EBUSY;
7697 goto out;
7698 }
7699 if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
7700 mutex_unlock(&mddev->open_mutex);
7701 err = -EBUSY;
7702 goto out;
7703 }
7704 mutex_unlock(&mddev->open_mutex);
7705 sync_blockdev(bdev);
7706 }
7707 err = mddev_lock(mddev);
7708 if (err) {
7709 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7710 err, cmd);
7711 goto out;
7712 }
7713
7714 if (cmd == SET_ARRAY_INFO) {
7715 err = __md_set_array_info(mddev, argp);
7716 goto unlock;
7717 }
7718
7719 /*
7720 * Commands querying/configuring an existing array:
7721 */
7722 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7723 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7724 if ((!mddev->raid_disks && !mddev->external)
7725 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7726 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7727 && cmd != GET_BITMAP_FILE) {
7728 err = -ENODEV;
7729 goto unlock;
7730 }
7731
7732 /*
7733 * Commands even a read-only array can execute:
7734 */
7735 switch (cmd) {
7736 case RESTART_ARRAY_RW:
7737 err = restart_array(mddev);
7738 goto unlock;
7739
7740 case STOP_ARRAY:
7741 err = do_md_stop(mddev, 0, bdev);
7742 goto unlock;
7743
7744 case STOP_ARRAY_RO:
7745 err = md_set_readonly(mddev, bdev);
7746 goto unlock;
7747
7748 case HOT_REMOVE_DISK:
7749 err = hot_remove_disk(mddev, new_decode_dev(arg));
7750 goto unlock;
7751
7752 case ADD_NEW_DISK:
7753 /* We can support ADD_NEW_DISK on read-only arrays
7754 * only if we are re-adding a preexisting device.
7755 * So require mddev->pers and MD_DISK_SYNC.
7756 */
7757 if (mddev->pers) {
7758 mdu_disk_info_t info;
7759 if (copy_from_user(&info, argp, sizeof(info)))
7760 err = -EFAULT;
7761 else if (!(info.state & (1<<MD_DISK_SYNC)))
7762 /* Need to clear read-only for this */
7763 break;
7764 else
7765 err = md_add_new_disk(mddev, &info);
7766 goto unlock;
7767 }
7768 break;
7769 }
7770
7771 /*
7772 * The remaining ioctls are changing the state of the
7773 * superblock, so we do not allow them on read-only arrays.
7774 */
7775 if (!md_is_rdwr(mddev) && mddev->pers) {
7776 if (mddev->ro != MD_AUTO_READ) {
7777 err = -EROFS;
7778 goto unlock;
7779 }
7780 mddev->ro = MD_RDWR;
7781 sysfs_notify_dirent_safe(mddev->sysfs_state);
7782 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7783 /* mddev_unlock will wake thread */
7784 /* If a device failed while we were read-only, we
7785 * need to make sure the metadata is updated now.
7786 */
7787 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7788 mddev_unlock(mddev);
7789 wait_event(mddev->sb_wait,
7790 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7791 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7792 mddev_lock_nointr(mddev);
7793 }
7794 }
7795
7796 switch (cmd) {
7797 case ADD_NEW_DISK:
7798 {
7799 mdu_disk_info_t info;
7800 if (copy_from_user(&info, argp, sizeof(info)))
7801 err = -EFAULT;
7802 else
7803 err = md_add_new_disk(mddev, &info);
7804 goto unlock;
7805 }
7806
7807 case CLUSTERED_DISK_NACK:
7808 if (mddev_is_clustered(mddev))
7809 md_cluster_ops->new_disk_ack(mddev, false);
7810 else
7811 err = -EINVAL;
7812 goto unlock;
7813
7814 case HOT_ADD_DISK:
7815 err = hot_add_disk(mddev, new_decode_dev(arg));
7816 goto unlock;
7817
7818 case RUN_ARRAY:
7819 err = do_md_run(mddev);
7820 goto unlock;
7821
7822 case SET_BITMAP_FILE:
7823 err = set_bitmap_file(mddev, (int)arg);
7824 goto unlock;
7825
7826 default:
7827 err = -EINVAL;
7828 goto unlock;
7829 }
7830
7831 unlock:
7832 if (mddev->hold_active == UNTIL_IOCTL &&
7833 err != -EINVAL)
7834 mddev->hold_active = 0;
7835 mddev_unlock(mddev);
7836 out:
7837 if (cmd == STOP_ARRAY_RO || (err && cmd == STOP_ARRAY))
7838 clear_bit(MD_CLOSING, &mddev->flags);
7839 return err;
7840 }
7841 #ifdef CONFIG_COMPAT
md_compat_ioctl(struct block_device * bdev,blk_mode_t mode,unsigned int cmd,unsigned long arg)7842 static int md_compat_ioctl(struct block_device *bdev, blk_mode_t mode,
7843 unsigned int cmd, unsigned long arg)
7844 {
7845 switch (cmd) {
7846 case HOT_REMOVE_DISK:
7847 case HOT_ADD_DISK:
7848 case SET_DISK_FAULTY:
7849 case SET_BITMAP_FILE:
7850 /* These take in integer arg, do not convert */
7851 break;
7852 default:
7853 arg = (unsigned long)compat_ptr(arg);
7854 break;
7855 }
7856
7857 return md_ioctl(bdev, mode, cmd, arg);
7858 }
7859 #endif /* CONFIG_COMPAT */
7860
md_set_read_only(struct block_device * bdev,bool ro)7861 static int md_set_read_only(struct block_device *bdev, bool ro)
7862 {
7863 struct mddev *mddev = bdev->bd_disk->private_data;
7864 int err;
7865
7866 err = mddev_lock(mddev);
7867 if (err)
7868 return err;
7869
7870 if (!mddev->raid_disks && !mddev->external) {
7871 err = -ENODEV;
7872 goto out_unlock;
7873 }
7874
7875 /*
7876 * Transitioning to read-auto need only happen for arrays that call
7877 * md_write_start and which are not ready for writes yet.
7878 */
7879 if (!ro && mddev->ro == MD_RDONLY && mddev->pers) {
7880 err = restart_array(mddev);
7881 if (err)
7882 goto out_unlock;
7883 mddev->ro = MD_AUTO_READ;
7884 }
7885
7886 out_unlock:
7887 mddev_unlock(mddev);
7888 return err;
7889 }
7890
md_open(struct gendisk * disk,blk_mode_t mode)7891 static int md_open(struct gendisk *disk, blk_mode_t mode)
7892 {
7893 struct mddev *mddev;
7894 int err;
7895
7896 spin_lock(&all_mddevs_lock);
7897 mddev = mddev_get(disk->private_data);
7898 spin_unlock(&all_mddevs_lock);
7899 if (!mddev)
7900 return -ENODEV;
7901
7902 err = mutex_lock_interruptible(&mddev->open_mutex);
7903 if (err)
7904 goto out;
7905
7906 err = -ENODEV;
7907 if (test_bit(MD_CLOSING, &mddev->flags))
7908 goto out_unlock;
7909
7910 atomic_inc(&mddev->openers);
7911 mutex_unlock(&mddev->open_mutex);
7912
7913 disk_check_media_change(disk);
7914 return 0;
7915
7916 out_unlock:
7917 mutex_unlock(&mddev->open_mutex);
7918 out:
7919 mddev_put(mddev);
7920 return err;
7921 }
7922
md_release(struct gendisk * disk)7923 static void md_release(struct gendisk *disk)
7924 {
7925 struct mddev *mddev = disk->private_data;
7926
7927 BUG_ON(!mddev);
7928 atomic_dec(&mddev->openers);
7929 mddev_put(mddev);
7930 }
7931
md_check_events(struct gendisk * disk,unsigned int clearing)7932 static unsigned int md_check_events(struct gendisk *disk, unsigned int clearing)
7933 {
7934 struct mddev *mddev = disk->private_data;
7935 unsigned int ret = 0;
7936
7937 if (mddev->changed)
7938 ret = DISK_EVENT_MEDIA_CHANGE;
7939 mddev->changed = 0;
7940 return ret;
7941 }
7942
md_free_disk(struct gendisk * disk)7943 static void md_free_disk(struct gendisk *disk)
7944 {
7945 struct mddev *mddev = disk->private_data;
7946
7947 percpu_ref_exit(&mddev->writes_pending);
7948 mddev_free(mddev);
7949 }
7950
7951 const struct block_device_operations md_fops =
7952 {
7953 .owner = THIS_MODULE,
7954 .submit_bio = md_submit_bio,
7955 .open = md_open,
7956 .release = md_release,
7957 .ioctl = md_ioctl,
7958 #ifdef CONFIG_COMPAT
7959 .compat_ioctl = md_compat_ioctl,
7960 #endif
7961 .getgeo = md_getgeo,
7962 .check_events = md_check_events,
7963 .set_read_only = md_set_read_only,
7964 .free_disk = md_free_disk,
7965 };
7966
md_thread(void * arg)7967 static int md_thread(void *arg)
7968 {
7969 struct md_thread *thread = arg;
7970
7971 /*
7972 * md_thread is a 'system-thread', it's priority should be very
7973 * high. We avoid resource deadlocks individually in each
7974 * raid personality. (RAID5 does preallocation) We also use RR and
7975 * the very same RT priority as kswapd, thus we will never get
7976 * into a priority inversion deadlock.
7977 *
7978 * we definitely have to have equal or higher priority than
7979 * bdflush, otherwise bdflush will deadlock if there are too
7980 * many dirty RAID5 blocks.
7981 */
7982
7983 allow_signal(SIGKILL);
7984 while (!kthread_should_stop()) {
7985
7986 /* We need to wait INTERRUPTIBLE so that
7987 * we don't add to the load-average.
7988 * That means we need to be sure no signals are
7989 * pending
7990 */
7991 if (signal_pending(current))
7992 flush_signals(current);
7993
7994 wait_event_interruptible_timeout
7995 (thread->wqueue,
7996 test_bit(THREAD_WAKEUP, &thread->flags)
7997 || kthread_should_stop() || kthread_should_park(),
7998 thread->timeout);
7999
8000 clear_bit(THREAD_WAKEUP, &thread->flags);
8001 if (kthread_should_park())
8002 kthread_parkme();
8003 if (!kthread_should_stop())
8004 thread->run(thread);
8005 }
8006
8007 return 0;
8008 }
8009
md_wakeup_thread_directly(struct md_thread __rcu * thread)8010 static void md_wakeup_thread_directly(struct md_thread __rcu *thread)
8011 {
8012 struct md_thread *t;
8013
8014 rcu_read_lock();
8015 t = rcu_dereference(thread);
8016 if (t)
8017 wake_up_process(t->tsk);
8018 rcu_read_unlock();
8019 }
8020
md_wakeup_thread(struct md_thread __rcu * thread)8021 void md_wakeup_thread(struct md_thread __rcu *thread)
8022 {
8023 struct md_thread *t;
8024
8025 rcu_read_lock();
8026 t = rcu_dereference(thread);
8027 if (t) {
8028 pr_debug("md: waking up MD thread %s.\n", t->tsk->comm);
8029 set_bit(THREAD_WAKEUP, &t->flags);
8030 wake_up(&t->wqueue);
8031 }
8032 rcu_read_unlock();
8033 }
8034 EXPORT_SYMBOL(md_wakeup_thread);
8035
md_register_thread(void (* run)(struct md_thread *),struct mddev * mddev,const char * name)8036 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
8037 struct mddev *mddev, const char *name)
8038 {
8039 struct md_thread *thread;
8040
8041 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
8042 if (!thread)
8043 return NULL;
8044
8045 init_waitqueue_head(&thread->wqueue);
8046
8047 thread->run = run;
8048 thread->mddev = mddev;
8049 thread->timeout = MAX_SCHEDULE_TIMEOUT;
8050 thread->tsk = kthread_run(md_thread, thread,
8051 "%s_%s",
8052 mdname(thread->mddev),
8053 name);
8054 if (IS_ERR(thread->tsk)) {
8055 kfree(thread);
8056 return NULL;
8057 }
8058 return thread;
8059 }
8060 EXPORT_SYMBOL(md_register_thread);
8061
md_unregister_thread(struct mddev * mddev,struct md_thread __rcu ** threadp)8062 void md_unregister_thread(struct mddev *mddev, struct md_thread __rcu **threadp)
8063 {
8064 struct md_thread *thread = rcu_dereference_protected(*threadp,
8065 lockdep_is_held(&mddev->reconfig_mutex));
8066
8067 if (!thread)
8068 return;
8069
8070 rcu_assign_pointer(*threadp, NULL);
8071 synchronize_rcu();
8072
8073 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
8074 kthread_stop(thread->tsk);
8075 kfree(thread);
8076 }
8077 EXPORT_SYMBOL(md_unregister_thread);
8078
md_error(struct mddev * mddev,struct md_rdev * rdev)8079 void md_error(struct mddev *mddev, struct md_rdev *rdev)
8080 {
8081 if (!rdev || test_bit(Faulty, &rdev->flags))
8082 return;
8083
8084 if (!mddev->pers || !mddev->pers->error_handler)
8085 return;
8086 mddev->pers->error_handler(mddev, rdev);
8087
8088 if (mddev->pers->level == 0 || mddev->pers->level == LEVEL_LINEAR)
8089 return;
8090
8091 if (mddev->degraded && !test_bit(MD_BROKEN, &mddev->flags))
8092 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8093 sysfs_notify_dirent_safe(rdev->sysfs_state);
8094 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8095 if (!test_bit(MD_BROKEN, &mddev->flags)) {
8096 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8097 md_wakeup_thread(mddev->thread);
8098 }
8099 if (mddev->event_work.func)
8100 queue_work(md_misc_wq, &mddev->event_work);
8101 md_new_event();
8102 }
8103 EXPORT_SYMBOL(md_error);
8104
8105 /* seq_file implementation /proc/mdstat */
8106
status_unused(struct seq_file * seq)8107 static void status_unused(struct seq_file *seq)
8108 {
8109 int i = 0;
8110 struct md_rdev *rdev;
8111
8112 seq_printf(seq, "unused devices: ");
8113
8114 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
8115 i++;
8116 seq_printf(seq, "%pg ", rdev->bdev);
8117 }
8118 if (!i)
8119 seq_printf(seq, "<none>");
8120
8121 seq_printf(seq, "\n");
8122 }
8123
status_personalities(struct seq_file * seq)8124 static void status_personalities(struct seq_file *seq)
8125 {
8126 struct md_personality *pers;
8127
8128 seq_puts(seq, "Personalities : ");
8129 spin_lock(&pers_lock);
8130 list_for_each_entry(pers, &pers_list, list)
8131 seq_printf(seq, "[%s] ", pers->name);
8132
8133 spin_unlock(&pers_lock);
8134 seq_puts(seq, "\n");
8135 }
8136
status_resync(struct seq_file * seq,struct mddev * mddev)8137 static int status_resync(struct seq_file *seq, struct mddev *mddev)
8138 {
8139 sector_t max_sectors, resync, res;
8140 unsigned long dt, db = 0;
8141 sector_t rt, curr_mark_cnt, resync_mark_cnt;
8142 int scale, recovery_active;
8143 unsigned int per_milli;
8144
8145 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8146 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8147 max_sectors = mddev->resync_max_sectors;
8148 else
8149 max_sectors = mddev->dev_sectors;
8150
8151 resync = mddev->curr_resync;
8152 if (resync < MD_RESYNC_ACTIVE) {
8153 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
8154 /* Still cleaning up */
8155 resync = max_sectors;
8156 } else if (resync > max_sectors) {
8157 resync = max_sectors;
8158 } else {
8159 res = atomic_read(&mddev->recovery_active);
8160 /*
8161 * Resync has started, but the subtraction has overflowed or
8162 * yielded one of the special values. Force it to active to
8163 * ensure the status reports an active resync.
8164 */
8165 if (resync < res || resync - res < MD_RESYNC_ACTIVE)
8166 resync = MD_RESYNC_ACTIVE;
8167 else
8168 resync -= res;
8169 }
8170
8171 if (resync == MD_RESYNC_NONE) {
8172 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) {
8173 struct md_rdev *rdev;
8174
8175 rdev_for_each(rdev, mddev)
8176 if (rdev->raid_disk >= 0 &&
8177 !test_bit(Faulty, &rdev->flags) &&
8178 rdev->recovery_offset != MaxSector &&
8179 rdev->recovery_offset) {
8180 seq_printf(seq, "\trecover=REMOTE");
8181 return 1;
8182 }
8183 if (mddev->reshape_position != MaxSector)
8184 seq_printf(seq, "\treshape=REMOTE");
8185 else
8186 seq_printf(seq, "\tresync=REMOTE");
8187 return 1;
8188 }
8189 if (mddev->recovery_cp < MaxSector) {
8190 seq_printf(seq, "\tresync=PENDING");
8191 return 1;
8192 }
8193 return 0;
8194 }
8195 if (resync < MD_RESYNC_ACTIVE) {
8196 seq_printf(seq, "\tresync=DELAYED");
8197 return 1;
8198 }
8199
8200 WARN_ON(max_sectors == 0);
8201 /* Pick 'scale' such that (resync>>scale)*1000 will fit
8202 * in a sector_t, and (max_sectors>>scale) will fit in a
8203 * u32, as those are the requirements for sector_div.
8204 * Thus 'scale' must be at least 10
8205 */
8206 scale = 10;
8207 if (sizeof(sector_t) > sizeof(unsigned long)) {
8208 while ( max_sectors/2 > (1ULL<<(scale+32)))
8209 scale++;
8210 }
8211 res = (resync>>scale)*1000;
8212 sector_div(res, (u32)((max_sectors>>scale)+1));
8213
8214 per_milli = res;
8215 {
8216 int i, x = per_milli/50, y = 20-x;
8217 seq_printf(seq, "[");
8218 for (i = 0; i < x; i++)
8219 seq_printf(seq, "=");
8220 seq_printf(seq, ">");
8221 for (i = 0; i < y; i++)
8222 seq_printf(seq, ".");
8223 seq_printf(seq, "] ");
8224 }
8225 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
8226 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
8227 "reshape" :
8228 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
8229 "check" :
8230 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
8231 "resync" : "recovery"))),
8232 per_milli/10, per_milli % 10,
8233 (unsigned long long) resync/2,
8234 (unsigned long long) max_sectors/2);
8235
8236 /*
8237 * dt: time from mark until now
8238 * db: blocks written from mark until now
8239 * rt: remaining time
8240 *
8241 * rt is a sector_t, which is always 64bit now. We are keeping
8242 * the original algorithm, but it is not really necessary.
8243 *
8244 * Original algorithm:
8245 * So we divide before multiply in case it is 32bit and close
8246 * to the limit.
8247 * We scale the divisor (db) by 32 to avoid losing precision
8248 * near the end of resync when the number of remaining sectors
8249 * is close to 'db'.
8250 * We then divide rt by 32 after multiplying by db to compensate.
8251 * The '+1' avoids division by zero if db is very small.
8252 */
8253 dt = ((jiffies - mddev->resync_mark) / HZ);
8254 if (!dt) dt++;
8255
8256 curr_mark_cnt = mddev->curr_mark_cnt;
8257 recovery_active = atomic_read(&mddev->recovery_active);
8258 resync_mark_cnt = mddev->resync_mark_cnt;
8259
8260 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
8261 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
8262
8263 rt = max_sectors - resync; /* number of remaining sectors */
8264 rt = div64_u64(rt, db/32+1);
8265 rt *= dt;
8266 rt >>= 5;
8267
8268 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
8269 ((unsigned long)rt % 60)/6);
8270
8271 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
8272 return 1;
8273 }
8274
md_seq_start(struct seq_file * seq,loff_t * pos)8275 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
8276 __acquires(&all_mddevs_lock)
8277 {
8278 seq->poll_event = atomic_read(&md_event_count);
8279 spin_lock(&all_mddevs_lock);
8280
8281 return seq_list_start_head(&all_mddevs, *pos);
8282 }
8283
md_seq_next(struct seq_file * seq,void * v,loff_t * pos)8284 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
8285 {
8286 return seq_list_next(v, &all_mddevs, pos);
8287 }
8288
md_seq_stop(struct seq_file * seq,void * v)8289 static void md_seq_stop(struct seq_file *seq, void *v)
8290 __releases(&all_mddevs_lock)
8291 {
8292 spin_unlock(&all_mddevs_lock);
8293 }
8294
md_bitmap_status(struct seq_file * seq,struct mddev * mddev)8295 static void md_bitmap_status(struct seq_file *seq, struct mddev *mddev)
8296 {
8297 struct md_bitmap_stats stats;
8298 unsigned long used_pages;
8299 unsigned long chunk_kb;
8300 int err;
8301
8302 err = md_bitmap_get_stats(mddev->bitmap, &stats);
8303 if (err)
8304 return;
8305
8306 chunk_kb = mddev->bitmap_info.chunksize >> 10;
8307 used_pages = stats.pages - stats.missing_pages;
8308
8309 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], %lu%s chunk",
8310 used_pages, stats.pages, used_pages << (PAGE_SHIFT - 10),
8311 chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize,
8312 chunk_kb ? "KB" : "B");
8313
8314 if (stats.file) {
8315 seq_puts(seq, ", file: ");
8316 seq_file_path(seq, stats.file, " \t\n");
8317 }
8318
8319 seq_putc(seq, '\n');
8320 }
8321
md_seq_show(struct seq_file * seq,void * v)8322 static int md_seq_show(struct seq_file *seq, void *v)
8323 {
8324 struct mddev *mddev;
8325 sector_t sectors;
8326 struct md_rdev *rdev;
8327
8328 if (v == &all_mddevs) {
8329 status_personalities(seq);
8330 if (list_empty(&all_mddevs))
8331 status_unused(seq);
8332 return 0;
8333 }
8334
8335 mddev = list_entry(v, struct mddev, all_mddevs);
8336 if (!mddev_get(mddev))
8337 return 0;
8338
8339 spin_unlock(&all_mddevs_lock);
8340
8341 /* prevent bitmap to be freed after checking */
8342 mutex_lock(&mddev->bitmap_info.mutex);
8343
8344 spin_lock(&mddev->lock);
8345 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
8346 seq_printf(seq, "%s : %sactive", mdname(mddev),
8347 mddev->pers ? "" : "in");
8348 if (mddev->pers) {
8349 if (mddev->ro == MD_RDONLY)
8350 seq_printf(seq, " (read-only)");
8351 if (mddev->ro == MD_AUTO_READ)
8352 seq_printf(seq, " (auto-read-only)");
8353 seq_printf(seq, " %s", mddev->pers->name);
8354 }
8355
8356 sectors = 0;
8357 rcu_read_lock();
8358 rdev_for_each_rcu(rdev, mddev) {
8359 seq_printf(seq, " %pg[%d]", rdev->bdev, rdev->desc_nr);
8360
8361 if (test_bit(WriteMostly, &rdev->flags))
8362 seq_printf(seq, "(W)");
8363 if (test_bit(Journal, &rdev->flags))
8364 seq_printf(seq, "(J)");
8365 if (test_bit(Faulty, &rdev->flags)) {
8366 seq_printf(seq, "(F)");
8367 continue;
8368 }
8369 if (rdev->raid_disk < 0)
8370 seq_printf(seq, "(S)"); /* spare */
8371 if (test_bit(Replacement, &rdev->flags))
8372 seq_printf(seq, "(R)");
8373 sectors += rdev->sectors;
8374 }
8375 rcu_read_unlock();
8376
8377 if (!list_empty(&mddev->disks)) {
8378 if (mddev->pers)
8379 seq_printf(seq, "\n %llu blocks",
8380 (unsigned long long)
8381 mddev->array_sectors / 2);
8382 else
8383 seq_printf(seq, "\n %llu blocks",
8384 (unsigned long long)sectors / 2);
8385 }
8386 if (mddev->persistent) {
8387 if (mddev->major_version != 0 ||
8388 mddev->minor_version != 90) {
8389 seq_printf(seq," super %d.%d",
8390 mddev->major_version,
8391 mddev->minor_version);
8392 }
8393 } else if (mddev->external)
8394 seq_printf(seq, " super external:%s",
8395 mddev->metadata_type);
8396 else
8397 seq_printf(seq, " super non-persistent");
8398
8399 if (mddev->pers) {
8400 mddev->pers->status(seq, mddev);
8401 seq_printf(seq, "\n ");
8402 if (mddev->pers->sync_request) {
8403 if (status_resync(seq, mddev))
8404 seq_printf(seq, "\n ");
8405 }
8406 } else
8407 seq_printf(seq, "\n ");
8408
8409 md_bitmap_status(seq, mddev);
8410
8411 seq_printf(seq, "\n");
8412 }
8413 spin_unlock(&mddev->lock);
8414 mutex_unlock(&mddev->bitmap_info.mutex);
8415 spin_lock(&all_mddevs_lock);
8416
8417 if (mddev == list_last_entry(&all_mddevs, struct mddev, all_mddevs))
8418 status_unused(seq);
8419
8420 if (atomic_dec_and_test(&mddev->active))
8421 __mddev_put(mddev);
8422
8423 return 0;
8424 }
8425
8426 static const struct seq_operations md_seq_ops = {
8427 .start = md_seq_start,
8428 .next = md_seq_next,
8429 .stop = md_seq_stop,
8430 .show = md_seq_show,
8431 };
8432
md_seq_open(struct inode * inode,struct file * file)8433 static int md_seq_open(struct inode *inode, struct file *file)
8434 {
8435 struct seq_file *seq;
8436 int error;
8437
8438 error = seq_open(file, &md_seq_ops);
8439 if (error)
8440 return error;
8441
8442 seq = file->private_data;
8443 seq->poll_event = atomic_read(&md_event_count);
8444 return error;
8445 }
8446
8447 static int md_unloading;
mdstat_poll(struct file * filp,poll_table * wait)8448 static __poll_t mdstat_poll(struct file *filp, poll_table *wait)
8449 {
8450 struct seq_file *seq = filp->private_data;
8451 __poll_t mask;
8452
8453 if (md_unloading)
8454 return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI;
8455 poll_wait(filp, &md_event_waiters, wait);
8456
8457 /* always allow read */
8458 mask = EPOLLIN | EPOLLRDNORM;
8459
8460 if (seq->poll_event != atomic_read(&md_event_count))
8461 mask |= EPOLLERR | EPOLLPRI;
8462 return mask;
8463 }
8464
8465 static const struct proc_ops mdstat_proc_ops = {
8466 .proc_open = md_seq_open,
8467 .proc_read = seq_read,
8468 .proc_lseek = seq_lseek,
8469 .proc_release = seq_release,
8470 .proc_poll = mdstat_poll,
8471 };
8472
register_md_personality(struct md_personality * p)8473 int register_md_personality(struct md_personality *p)
8474 {
8475 pr_debug("md: %s personality registered for level %d\n",
8476 p->name, p->level);
8477 spin_lock(&pers_lock);
8478 list_add_tail(&p->list, &pers_list);
8479 spin_unlock(&pers_lock);
8480 return 0;
8481 }
8482 EXPORT_SYMBOL(register_md_personality);
8483
unregister_md_personality(struct md_personality * p)8484 int unregister_md_personality(struct md_personality *p)
8485 {
8486 pr_debug("md: %s personality unregistered\n", p->name);
8487 spin_lock(&pers_lock);
8488 list_del_init(&p->list);
8489 spin_unlock(&pers_lock);
8490 return 0;
8491 }
8492 EXPORT_SYMBOL(unregister_md_personality);
8493
register_md_cluster_operations(struct md_cluster_operations * ops,struct module * module)8494 int register_md_cluster_operations(struct md_cluster_operations *ops,
8495 struct module *module)
8496 {
8497 int ret = 0;
8498 spin_lock(&pers_lock);
8499 if (md_cluster_ops != NULL)
8500 ret = -EALREADY;
8501 else {
8502 md_cluster_ops = ops;
8503 md_cluster_mod = module;
8504 }
8505 spin_unlock(&pers_lock);
8506 return ret;
8507 }
8508 EXPORT_SYMBOL(register_md_cluster_operations);
8509
unregister_md_cluster_operations(void)8510 int unregister_md_cluster_operations(void)
8511 {
8512 spin_lock(&pers_lock);
8513 md_cluster_ops = NULL;
8514 spin_unlock(&pers_lock);
8515 return 0;
8516 }
8517 EXPORT_SYMBOL(unregister_md_cluster_operations);
8518
md_setup_cluster(struct mddev * mddev,int nodes)8519 int md_setup_cluster(struct mddev *mddev, int nodes)
8520 {
8521 int ret;
8522 if (!md_cluster_ops)
8523 request_module("md-cluster");
8524 spin_lock(&pers_lock);
8525 /* ensure module won't be unloaded */
8526 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8527 pr_warn("can't find md-cluster module or get its reference.\n");
8528 spin_unlock(&pers_lock);
8529 return -ENOENT;
8530 }
8531 spin_unlock(&pers_lock);
8532
8533 ret = md_cluster_ops->join(mddev, nodes);
8534 if (!ret)
8535 mddev->safemode_delay = 0;
8536 return ret;
8537 }
8538
md_cluster_stop(struct mddev * mddev)8539 void md_cluster_stop(struct mddev *mddev)
8540 {
8541 if (!md_cluster_ops)
8542 return;
8543 md_cluster_ops->leave(mddev);
8544 module_put(md_cluster_mod);
8545 }
8546
is_mddev_idle(struct mddev * mddev,int init)8547 static int is_mddev_idle(struct mddev *mddev, int init)
8548 {
8549 struct md_rdev *rdev;
8550 int idle;
8551 int curr_events;
8552
8553 idle = 1;
8554 rcu_read_lock();
8555 rdev_for_each_rcu(rdev, mddev) {
8556 struct gendisk *disk = rdev->bdev->bd_disk;
8557 curr_events = (int)part_stat_read_accum(disk->part0, sectors) -
8558 atomic_read(&disk->sync_io);
8559 /* sync IO will cause sync_io to increase before the disk_stats
8560 * as sync_io is counted when a request starts, and
8561 * disk_stats is counted when it completes.
8562 * So resync activity will cause curr_events to be smaller than
8563 * when there was no such activity.
8564 * non-sync IO will cause disk_stat to increase without
8565 * increasing sync_io so curr_events will (eventually)
8566 * be larger than it was before. Once it becomes
8567 * substantially larger, the test below will cause
8568 * the array to appear non-idle, and resync will slow
8569 * down.
8570 * If there is a lot of outstanding resync activity when
8571 * we set last_event to curr_events, then all that activity
8572 * completing might cause the array to appear non-idle
8573 * and resync will be slowed down even though there might
8574 * not have been non-resync activity. This will only
8575 * happen once though. 'last_events' will soon reflect
8576 * the state where there is little or no outstanding
8577 * resync requests, and further resync activity will
8578 * always make curr_events less than last_events.
8579 *
8580 */
8581 if (init || curr_events - rdev->last_events > 64) {
8582 rdev->last_events = curr_events;
8583 idle = 0;
8584 }
8585 }
8586 rcu_read_unlock();
8587 return idle;
8588 }
8589
md_done_sync(struct mddev * mddev,int blocks,int ok)8590 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8591 {
8592 /* another "blocks" (512byte) blocks have been synced */
8593 atomic_sub(blocks, &mddev->recovery_active);
8594 wake_up(&mddev->recovery_wait);
8595 if (!ok) {
8596 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8597 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8598 md_wakeup_thread(mddev->thread);
8599 // stop recovery, signal do_sync ....
8600 }
8601 }
8602 EXPORT_SYMBOL(md_done_sync);
8603
8604 /* md_write_start(mddev, bi)
8605 * If we need to update some array metadata (e.g. 'active' flag
8606 * in superblock) before writing, schedule a superblock update
8607 * and wait for it to complete.
8608 * A return value of 'false' means that the write wasn't recorded
8609 * and cannot proceed as the array is being suspend.
8610 */
md_write_start(struct mddev * mddev,struct bio * bi)8611 bool md_write_start(struct mddev *mddev, struct bio *bi)
8612 {
8613 int did_change = 0;
8614
8615 if (bio_data_dir(bi) != WRITE)
8616 return true;
8617
8618 BUG_ON(mddev->ro == MD_RDONLY);
8619 if (mddev->ro == MD_AUTO_READ) {
8620 /* need to switch to read/write */
8621 mddev->ro = MD_RDWR;
8622 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8623 md_wakeup_thread(mddev->thread);
8624 md_wakeup_thread(mddev->sync_thread);
8625 did_change = 1;
8626 }
8627 rcu_read_lock();
8628 percpu_ref_get(&mddev->writes_pending);
8629 smp_mb(); /* Match smp_mb in set_in_sync() */
8630 if (mddev->safemode == 1)
8631 mddev->safemode = 0;
8632 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8633 if (mddev->in_sync || mddev->sync_checkers) {
8634 spin_lock(&mddev->lock);
8635 if (mddev->in_sync) {
8636 mddev->in_sync = 0;
8637 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8638 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8639 md_wakeup_thread(mddev->thread);
8640 did_change = 1;
8641 }
8642 spin_unlock(&mddev->lock);
8643 }
8644 rcu_read_unlock();
8645 if (did_change)
8646 sysfs_notify_dirent_safe(mddev->sysfs_state);
8647 if (!mddev->has_superblocks)
8648 return true;
8649 wait_event(mddev->sb_wait,
8650 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8651 is_md_suspended(mddev));
8652 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8653 percpu_ref_put(&mddev->writes_pending);
8654 return false;
8655 }
8656 return true;
8657 }
8658 EXPORT_SYMBOL(md_write_start);
8659
8660 /* md_write_inc can only be called when md_write_start() has
8661 * already been called at least once of the current request.
8662 * It increments the counter and is useful when a single request
8663 * is split into several parts. Each part causes an increment and
8664 * so needs a matching md_write_end().
8665 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8666 * a spinlocked region.
8667 */
md_write_inc(struct mddev * mddev,struct bio * bi)8668 void md_write_inc(struct mddev *mddev, struct bio *bi)
8669 {
8670 if (bio_data_dir(bi) != WRITE)
8671 return;
8672 WARN_ON_ONCE(mddev->in_sync || !md_is_rdwr(mddev));
8673 percpu_ref_get(&mddev->writes_pending);
8674 }
8675 EXPORT_SYMBOL(md_write_inc);
8676
md_write_end(struct mddev * mddev)8677 void md_write_end(struct mddev *mddev)
8678 {
8679 percpu_ref_put(&mddev->writes_pending);
8680
8681 if (mddev->safemode == 2)
8682 md_wakeup_thread(mddev->thread);
8683 else if (mddev->safemode_delay)
8684 /* The roundup() ensures this only performs locking once
8685 * every ->safemode_delay jiffies
8686 */
8687 mod_timer(&mddev->safemode_timer,
8688 roundup(jiffies, mddev->safemode_delay) +
8689 mddev->safemode_delay);
8690 }
8691
8692 EXPORT_SYMBOL(md_write_end);
8693
8694 /* This is used by raid0 and raid10 */
md_submit_discard_bio(struct mddev * mddev,struct md_rdev * rdev,struct bio * bio,sector_t start,sector_t size)8695 void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev,
8696 struct bio *bio, sector_t start, sector_t size)
8697 {
8698 struct bio *discard_bio = NULL;
8699
8700 if (__blkdev_issue_discard(rdev->bdev, start, size, GFP_NOIO,
8701 &discard_bio) || !discard_bio)
8702 return;
8703
8704 bio_chain(discard_bio, bio);
8705 bio_clone_blkg_association(discard_bio, bio);
8706 if (mddev->gendisk)
8707 trace_block_bio_remap(discard_bio,
8708 disk_devt(mddev->gendisk),
8709 bio->bi_iter.bi_sector);
8710 submit_bio_noacct(discard_bio);
8711 }
8712 EXPORT_SYMBOL_GPL(md_submit_discard_bio);
8713
md_bitmap_start(struct mddev * mddev,struct md_io_clone * md_io_clone)8714 static void md_bitmap_start(struct mddev *mddev,
8715 struct md_io_clone *md_io_clone)
8716 {
8717 if (mddev->pers->bitmap_sector)
8718 mddev->pers->bitmap_sector(mddev, &md_io_clone->offset,
8719 &md_io_clone->sectors);
8720
8721 md_bitmap_startwrite(mddev->bitmap, md_io_clone->offset,
8722 md_io_clone->sectors);
8723 }
8724
md_bitmap_end(struct mddev * mddev,struct md_io_clone * md_io_clone)8725 static void md_bitmap_end(struct mddev *mddev, struct md_io_clone *md_io_clone)
8726 {
8727 md_bitmap_endwrite(mddev->bitmap, md_io_clone->offset,
8728 md_io_clone->sectors);
8729 }
8730
md_end_clone_io(struct bio * bio)8731 static void md_end_clone_io(struct bio *bio)
8732 {
8733 struct md_io_clone *md_io_clone = bio->bi_private;
8734 struct bio *orig_bio = md_io_clone->orig_bio;
8735 struct mddev *mddev = md_io_clone->mddev;
8736
8737 if (bio_data_dir(orig_bio) == WRITE && mddev->bitmap)
8738 md_bitmap_end(mddev, md_io_clone);
8739
8740 if (bio->bi_status && !orig_bio->bi_status)
8741 orig_bio->bi_status = bio->bi_status;
8742
8743 if (md_io_clone->start_time)
8744 bio_end_io_acct(orig_bio, md_io_clone->start_time);
8745
8746 bio_put(bio);
8747 bio_endio(orig_bio);
8748 percpu_ref_put(&mddev->active_io);
8749 }
8750
md_clone_bio(struct mddev * mddev,struct bio ** bio)8751 static void md_clone_bio(struct mddev *mddev, struct bio **bio)
8752 {
8753 struct block_device *bdev = (*bio)->bi_bdev;
8754 struct md_io_clone *md_io_clone;
8755 struct bio *clone =
8756 bio_alloc_clone(bdev, *bio, GFP_NOIO, &mddev->io_clone_set);
8757
8758 md_io_clone = container_of(clone, struct md_io_clone, bio_clone);
8759 md_io_clone->orig_bio = *bio;
8760 md_io_clone->mddev = mddev;
8761 if (blk_queue_io_stat(bdev->bd_disk->queue))
8762 md_io_clone->start_time = bio_start_io_acct(*bio);
8763
8764 if (bio_data_dir(*bio) == WRITE && mddev->bitmap) {
8765 md_io_clone->offset = (*bio)->bi_iter.bi_sector;
8766 md_io_clone->sectors = bio_sectors(*bio);
8767 md_bitmap_start(mddev, md_io_clone);
8768 }
8769
8770 clone->bi_end_io = md_end_clone_io;
8771 clone->bi_private = md_io_clone;
8772 *bio = clone;
8773 }
8774
md_account_bio(struct mddev * mddev,struct bio ** bio)8775 void md_account_bio(struct mddev *mddev, struct bio **bio)
8776 {
8777 percpu_ref_get(&mddev->active_io);
8778 md_clone_bio(mddev, bio);
8779 }
8780 EXPORT_SYMBOL_GPL(md_account_bio);
8781
8782 /* md_allow_write(mddev)
8783 * Calling this ensures that the array is marked 'active' so that writes
8784 * may proceed without blocking. It is important to call this before
8785 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8786 * Must be called with mddev_lock held.
8787 */
md_allow_write(struct mddev * mddev)8788 void md_allow_write(struct mddev *mddev)
8789 {
8790 if (!mddev->pers)
8791 return;
8792 if (!md_is_rdwr(mddev))
8793 return;
8794 if (!mddev->pers->sync_request)
8795 return;
8796
8797 spin_lock(&mddev->lock);
8798 if (mddev->in_sync) {
8799 mddev->in_sync = 0;
8800 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8801 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8802 if (mddev->safemode_delay &&
8803 mddev->safemode == 0)
8804 mddev->safemode = 1;
8805 spin_unlock(&mddev->lock);
8806 md_update_sb(mddev, 0);
8807 sysfs_notify_dirent_safe(mddev->sysfs_state);
8808 /* wait for the dirty state to be recorded in the metadata */
8809 wait_event(mddev->sb_wait,
8810 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8811 } else
8812 spin_unlock(&mddev->lock);
8813 }
8814 EXPORT_SYMBOL_GPL(md_allow_write);
8815
8816 #define SYNC_MARKS 10
8817 #define SYNC_MARK_STEP (3*HZ)
8818 #define UPDATE_FREQUENCY (5*60*HZ)
md_do_sync(struct md_thread * thread)8819 void md_do_sync(struct md_thread *thread)
8820 {
8821 struct mddev *mddev = thread->mddev;
8822 struct mddev *mddev2;
8823 unsigned int currspeed = 0, window;
8824 sector_t max_sectors,j, io_sectors, recovery_done;
8825 unsigned long mark[SYNC_MARKS];
8826 unsigned long update_time;
8827 sector_t mark_cnt[SYNC_MARKS];
8828 int last_mark,m;
8829 sector_t last_check;
8830 int skipped = 0;
8831 struct md_rdev *rdev;
8832 char *desc, *action = NULL;
8833 struct blk_plug plug;
8834 int ret;
8835
8836 /* just incase thread restarts... */
8837 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8838 test_bit(MD_RECOVERY_WAIT, &mddev->recovery))
8839 return;
8840 if (!md_is_rdwr(mddev)) {/* never try to sync a read-only array */
8841 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8842 return;
8843 }
8844
8845 if (mddev_is_clustered(mddev)) {
8846 ret = md_cluster_ops->resync_start(mddev);
8847 if (ret)
8848 goto skip;
8849
8850 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8851 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8852 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8853 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8854 && ((unsigned long long)mddev->curr_resync_completed
8855 < (unsigned long long)mddev->resync_max_sectors))
8856 goto skip;
8857 }
8858
8859 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8860 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8861 desc = "data-check";
8862 action = "check";
8863 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8864 desc = "requested-resync";
8865 action = "repair";
8866 } else
8867 desc = "resync";
8868 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8869 desc = "reshape";
8870 else
8871 desc = "recovery";
8872
8873 mddev->last_sync_action = action ?: desc;
8874
8875 /*
8876 * Before starting a resync we must have set curr_resync to
8877 * 2, and then checked that every "conflicting" array has curr_resync
8878 * less than ours. When we find one that is the same or higher
8879 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8880 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8881 * This will mean we have to start checking from the beginning again.
8882 *
8883 */
8884
8885 do {
8886 int mddev2_minor = -1;
8887 mddev->curr_resync = MD_RESYNC_DELAYED;
8888
8889 try_again:
8890 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8891 goto skip;
8892 spin_lock(&all_mddevs_lock);
8893 list_for_each_entry(mddev2, &all_mddevs, all_mddevs) {
8894 if (test_bit(MD_DELETED, &mddev2->flags))
8895 continue;
8896 if (mddev2 == mddev)
8897 continue;
8898 if (!mddev->parallel_resync
8899 && mddev2->curr_resync
8900 && match_mddev_units(mddev, mddev2)) {
8901 DEFINE_WAIT(wq);
8902 if (mddev < mddev2 &&
8903 mddev->curr_resync == MD_RESYNC_DELAYED) {
8904 /* arbitrarily yield */
8905 mddev->curr_resync = MD_RESYNC_YIELDED;
8906 wake_up(&resync_wait);
8907 }
8908 if (mddev > mddev2 &&
8909 mddev->curr_resync == MD_RESYNC_YIELDED)
8910 /* no need to wait here, we can wait the next
8911 * time 'round when curr_resync == 2
8912 */
8913 continue;
8914 /* We need to wait 'interruptible' so as not to
8915 * contribute to the load average, and not to
8916 * be caught by 'softlockup'
8917 */
8918 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8919 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8920 mddev2->curr_resync >= mddev->curr_resync) {
8921 if (mddev2_minor != mddev2->md_minor) {
8922 mddev2_minor = mddev2->md_minor;
8923 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8924 desc, mdname(mddev),
8925 mdname(mddev2));
8926 }
8927 spin_unlock(&all_mddevs_lock);
8928
8929 if (signal_pending(current))
8930 flush_signals(current);
8931 schedule();
8932 finish_wait(&resync_wait, &wq);
8933 goto try_again;
8934 }
8935 finish_wait(&resync_wait, &wq);
8936 }
8937 }
8938 spin_unlock(&all_mddevs_lock);
8939 } while (mddev->curr_resync < MD_RESYNC_DELAYED);
8940
8941 j = 0;
8942 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8943 /* resync follows the size requested by the personality,
8944 * which defaults to physical size, but can be virtual size
8945 */
8946 max_sectors = mddev->resync_max_sectors;
8947 atomic64_set(&mddev->resync_mismatches, 0);
8948 /* we don't use the checkpoint if there's a bitmap */
8949 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8950 j = mddev->resync_min;
8951 else if (!mddev->bitmap)
8952 j = mddev->recovery_cp;
8953
8954 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
8955 max_sectors = mddev->resync_max_sectors;
8956 /*
8957 * If the original node aborts reshaping then we continue the
8958 * reshaping, so set j again to avoid restart reshape from the
8959 * first beginning
8960 */
8961 if (mddev_is_clustered(mddev) &&
8962 mddev->reshape_position != MaxSector)
8963 j = mddev->reshape_position;
8964 } else {
8965 /* recovery follows the physical size of devices */
8966 max_sectors = mddev->dev_sectors;
8967 j = MaxSector;
8968 rcu_read_lock();
8969 rdev_for_each_rcu(rdev, mddev)
8970 if (rdev->raid_disk >= 0 &&
8971 !test_bit(Journal, &rdev->flags) &&
8972 !test_bit(Faulty, &rdev->flags) &&
8973 !test_bit(In_sync, &rdev->flags) &&
8974 rdev->recovery_offset < j)
8975 j = rdev->recovery_offset;
8976 rcu_read_unlock();
8977
8978 /* If there is a bitmap, we need to make sure all
8979 * writes that started before we added a spare
8980 * complete before we start doing a recovery.
8981 * Otherwise the write might complete and (via
8982 * bitmap_endwrite) set a bit in the bitmap after the
8983 * recovery has checked that bit and skipped that
8984 * region.
8985 */
8986 if (mddev->bitmap) {
8987 mddev->pers->quiesce(mddev, 1);
8988 mddev->pers->quiesce(mddev, 0);
8989 }
8990 }
8991
8992 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8993 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8994 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8995 speed_max(mddev), desc);
8996
8997 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8998
8999 io_sectors = 0;
9000 for (m = 0; m < SYNC_MARKS; m++) {
9001 mark[m] = jiffies;
9002 mark_cnt[m] = io_sectors;
9003 }
9004 last_mark = 0;
9005 mddev->resync_mark = mark[last_mark];
9006 mddev->resync_mark_cnt = mark_cnt[last_mark];
9007
9008 /*
9009 * Tune reconstruction:
9010 */
9011 window = 32 * (PAGE_SIZE / 512);
9012 pr_debug("md: using %dk window, over a total of %lluk.\n",
9013 window/2, (unsigned long long)max_sectors/2);
9014
9015 atomic_set(&mddev->recovery_active, 0);
9016 last_check = 0;
9017
9018 if (j >= MD_RESYNC_ACTIVE) {
9019 pr_debug("md: resuming %s of %s from checkpoint.\n",
9020 desc, mdname(mddev));
9021 mddev->curr_resync = j;
9022 } else
9023 mddev->curr_resync = MD_RESYNC_ACTIVE; /* no longer delayed */
9024 mddev->curr_resync_completed = j;
9025 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9026 md_new_event();
9027 update_time = jiffies;
9028
9029 blk_start_plug(&plug);
9030 while (j < max_sectors) {
9031 sector_t sectors;
9032
9033 skipped = 0;
9034
9035 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9036 ((mddev->curr_resync > mddev->curr_resync_completed &&
9037 (mddev->curr_resync - mddev->curr_resync_completed)
9038 > (max_sectors >> 4)) ||
9039 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
9040 (j - mddev->curr_resync_completed)*2
9041 >= mddev->resync_max - mddev->curr_resync_completed ||
9042 mddev->curr_resync_completed > mddev->resync_max
9043 )) {
9044 /* time to update curr_resync_completed */
9045 wait_event(mddev->recovery_wait,
9046 atomic_read(&mddev->recovery_active) == 0);
9047 mddev->curr_resync_completed = j;
9048 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
9049 j > mddev->recovery_cp)
9050 mddev->recovery_cp = j;
9051 update_time = jiffies;
9052 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
9053 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9054 }
9055
9056 while (j >= mddev->resync_max &&
9057 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9058 /* As this condition is controlled by user-space,
9059 * we can block indefinitely, so use '_interruptible'
9060 * to avoid triggering warnings.
9061 */
9062 flush_signals(current); /* just in case */
9063 wait_event_interruptible(mddev->recovery_wait,
9064 mddev->resync_max > j
9065 || test_bit(MD_RECOVERY_INTR,
9066 &mddev->recovery));
9067 }
9068
9069 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9070 break;
9071
9072 sectors = mddev->pers->sync_request(mddev, j, &skipped);
9073 if (sectors == 0) {
9074 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
9075 break;
9076 }
9077
9078 if (!skipped) { /* actual IO requested */
9079 io_sectors += sectors;
9080 atomic_add(sectors, &mddev->recovery_active);
9081 }
9082
9083 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9084 break;
9085
9086 j += sectors;
9087 if (j > max_sectors)
9088 /* when skipping, extra large numbers can be returned. */
9089 j = max_sectors;
9090 if (j >= MD_RESYNC_ACTIVE)
9091 mddev->curr_resync = j;
9092 mddev->curr_mark_cnt = io_sectors;
9093 if (last_check == 0)
9094 /* this is the earliest that rebuild will be
9095 * visible in /proc/mdstat
9096 */
9097 md_new_event();
9098
9099 if (last_check + window > io_sectors || j == max_sectors)
9100 continue;
9101
9102 last_check = io_sectors;
9103 repeat:
9104 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
9105 /* step marks */
9106 int next = (last_mark+1) % SYNC_MARKS;
9107
9108 mddev->resync_mark = mark[next];
9109 mddev->resync_mark_cnt = mark_cnt[next];
9110 mark[next] = jiffies;
9111 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
9112 last_mark = next;
9113 }
9114
9115 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9116 break;
9117
9118 /*
9119 * this loop exits only if either when we are slower than
9120 * the 'hard' speed limit, or the system was IO-idle for
9121 * a jiffy.
9122 * the system might be non-idle CPU-wise, but we only care
9123 * about not overloading the IO subsystem. (things like an
9124 * e2fsck being done on the RAID array should execute fast)
9125 */
9126 cond_resched();
9127
9128 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
9129 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
9130 /((jiffies-mddev->resync_mark)/HZ +1) +1;
9131
9132 if (currspeed > speed_min(mddev)) {
9133 if (currspeed > speed_max(mddev)) {
9134 msleep(500);
9135 goto repeat;
9136 }
9137 if (!is_mddev_idle(mddev, 0)) {
9138 /*
9139 * Give other IO more of a chance.
9140 * The faster the devices, the less we wait.
9141 */
9142 wait_event(mddev->recovery_wait,
9143 !atomic_read(&mddev->recovery_active));
9144 }
9145 }
9146 }
9147 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
9148 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
9149 ? "interrupted" : "done");
9150 /*
9151 * this also signals 'finished resyncing' to md_stop
9152 */
9153 blk_finish_plug(&plug);
9154 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
9155
9156 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9157 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9158 mddev->curr_resync >= MD_RESYNC_ACTIVE) {
9159 mddev->curr_resync_completed = mddev->curr_resync;
9160 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9161 }
9162 mddev->pers->sync_request(mddev, max_sectors, &skipped);
9163
9164 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
9165 mddev->curr_resync > MD_RESYNC_ACTIVE) {
9166 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
9167 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9168 if (mddev->curr_resync >= mddev->recovery_cp) {
9169 pr_debug("md: checkpointing %s of %s.\n",
9170 desc, mdname(mddev));
9171 if (test_bit(MD_RECOVERY_ERROR,
9172 &mddev->recovery))
9173 mddev->recovery_cp =
9174 mddev->curr_resync_completed;
9175 else
9176 mddev->recovery_cp =
9177 mddev->curr_resync;
9178 }
9179 } else
9180 mddev->recovery_cp = MaxSector;
9181 } else {
9182 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
9183 mddev->curr_resync = MaxSector;
9184 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9185 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) {
9186 rcu_read_lock();
9187 rdev_for_each_rcu(rdev, mddev)
9188 if (rdev->raid_disk >= 0 &&
9189 mddev->delta_disks >= 0 &&
9190 !test_bit(Journal, &rdev->flags) &&
9191 !test_bit(Faulty, &rdev->flags) &&
9192 !test_bit(In_sync, &rdev->flags) &&
9193 rdev->recovery_offset < mddev->curr_resync)
9194 rdev->recovery_offset = mddev->curr_resync;
9195 rcu_read_unlock();
9196 }
9197 }
9198 }
9199 skip:
9200 /* set CHANGE_PENDING here since maybe another update is needed,
9201 * so other nodes are informed. It should be harmless for normal
9202 * raid */
9203 set_mask_bits(&mddev->sb_flags, 0,
9204 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
9205
9206 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9207 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9208 mddev->delta_disks > 0 &&
9209 mddev->pers->finish_reshape &&
9210 mddev->pers->size &&
9211 mddev->queue) {
9212 mddev_lock_nointr(mddev);
9213 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
9214 mddev_unlock(mddev);
9215 if (!mddev_is_clustered(mddev))
9216 set_capacity_and_notify(mddev->gendisk,
9217 mddev->array_sectors);
9218 }
9219
9220 spin_lock(&mddev->lock);
9221 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
9222 /* We completed so min/max setting can be forgotten if used. */
9223 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9224 mddev->resync_min = 0;
9225 mddev->resync_max = MaxSector;
9226 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
9227 mddev->resync_min = mddev->curr_resync_completed;
9228 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
9229 mddev->curr_resync = MD_RESYNC_NONE;
9230 spin_unlock(&mddev->lock);
9231
9232 wake_up(&resync_wait);
9233 wake_up(&mddev->sb_wait);
9234 md_wakeup_thread(mddev->thread);
9235 return;
9236 }
9237 EXPORT_SYMBOL_GPL(md_do_sync);
9238
remove_and_add_spares(struct mddev * mddev,struct md_rdev * this)9239 static int remove_and_add_spares(struct mddev *mddev,
9240 struct md_rdev *this)
9241 {
9242 struct md_rdev *rdev;
9243 int spares = 0;
9244 int removed = 0;
9245 bool remove_some = false;
9246
9247 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
9248 /* Mustn't remove devices when resync thread is running */
9249 return 0;
9250
9251 rdev_for_each(rdev, mddev) {
9252 if ((this == NULL || rdev == this) &&
9253 rdev->raid_disk >= 0 &&
9254 !test_bit(Blocked, &rdev->flags) &&
9255 test_bit(Faulty, &rdev->flags) &&
9256 atomic_read(&rdev->nr_pending)==0) {
9257 /* Faulty non-Blocked devices with nr_pending == 0
9258 * never get nr_pending incremented,
9259 * never get Faulty cleared, and never get Blocked set.
9260 * So we can synchronize_rcu now rather than once per device
9261 */
9262 remove_some = true;
9263 set_bit(RemoveSynchronized, &rdev->flags);
9264 }
9265 }
9266
9267 if (remove_some)
9268 synchronize_rcu();
9269 rdev_for_each(rdev, mddev) {
9270 if ((this == NULL || rdev == this) &&
9271 rdev->raid_disk >= 0 &&
9272 !test_bit(Blocked, &rdev->flags) &&
9273 ((test_bit(RemoveSynchronized, &rdev->flags) ||
9274 (!test_bit(In_sync, &rdev->flags) &&
9275 !test_bit(Journal, &rdev->flags))) &&
9276 atomic_read(&rdev->nr_pending)==0)) {
9277 if (mddev->pers->hot_remove_disk(
9278 mddev, rdev) == 0) {
9279 sysfs_unlink_rdev(mddev, rdev);
9280 rdev->saved_raid_disk = rdev->raid_disk;
9281 rdev->raid_disk = -1;
9282 removed++;
9283 }
9284 }
9285 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
9286 clear_bit(RemoveSynchronized, &rdev->flags);
9287 }
9288
9289 if (removed && mddev->kobj.sd)
9290 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9291
9292 if (this && removed)
9293 goto no_add;
9294
9295 rdev_for_each(rdev, mddev) {
9296 if (this && this != rdev)
9297 continue;
9298 if (test_bit(Candidate, &rdev->flags))
9299 continue;
9300 if (rdev->raid_disk >= 0 &&
9301 !test_bit(In_sync, &rdev->flags) &&
9302 !test_bit(Journal, &rdev->flags) &&
9303 !test_bit(Faulty, &rdev->flags))
9304 spares++;
9305 if (rdev->raid_disk >= 0)
9306 continue;
9307 if (test_bit(Faulty, &rdev->flags))
9308 continue;
9309 if (!test_bit(Journal, &rdev->flags)) {
9310 if (!md_is_rdwr(mddev) &&
9311 !(rdev->saved_raid_disk >= 0 &&
9312 !test_bit(Bitmap_sync, &rdev->flags)))
9313 continue;
9314
9315 rdev->recovery_offset = 0;
9316 }
9317 if (mddev->pers->hot_add_disk(mddev, rdev) == 0) {
9318 /* failure here is OK */
9319 sysfs_link_rdev(mddev, rdev);
9320 if (!test_bit(Journal, &rdev->flags))
9321 spares++;
9322 md_new_event();
9323 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9324 }
9325 }
9326 no_add:
9327 if (removed)
9328 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9329 return spares;
9330 }
9331
md_start_sync(struct work_struct * ws)9332 static void md_start_sync(struct work_struct *ws)
9333 {
9334 struct mddev *mddev = container_of(ws, struct mddev, sync_work);
9335
9336 rcu_assign_pointer(mddev->sync_thread,
9337 md_register_thread(md_do_sync, mddev, "resync"));
9338 if (!mddev->sync_thread) {
9339 pr_warn("%s: could not start resync thread...\n",
9340 mdname(mddev));
9341 /* leave the spares where they are, it shouldn't hurt */
9342 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9343 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9344 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9345 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9346 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9347 wake_up(&resync_wait);
9348 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9349 &mddev->recovery))
9350 if (mddev->sysfs_action)
9351 sysfs_notify_dirent_safe(mddev->sysfs_action);
9352 } else
9353 md_wakeup_thread(mddev->sync_thread);
9354 sysfs_notify_dirent_safe(mddev->sysfs_action);
9355 md_new_event();
9356 }
9357
9358 /*
9359 * This routine is regularly called by all per-raid-array threads to
9360 * deal with generic issues like resync and super-block update.
9361 * Raid personalities that don't have a thread (linear/raid0) do not
9362 * need this as they never do any recovery or update the superblock.
9363 *
9364 * It does not do any resync itself, but rather "forks" off other threads
9365 * to do that as needed.
9366 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
9367 * "->recovery" and create a thread at ->sync_thread.
9368 * When the thread finishes it sets MD_RECOVERY_DONE
9369 * and wakeups up this thread which will reap the thread and finish up.
9370 * This thread also removes any faulty devices (with nr_pending == 0).
9371 *
9372 * The overall approach is:
9373 * 1/ if the superblock needs updating, update it.
9374 * 2/ If a recovery thread is running, don't do anything else.
9375 * 3/ If recovery has finished, clean up, possibly marking spares active.
9376 * 4/ If there are any faulty devices, remove them.
9377 * 5/ If array is degraded, try to add spares devices
9378 * 6/ If array has spares or is not in-sync, start a resync thread.
9379 */
md_check_recovery(struct mddev * mddev)9380 void md_check_recovery(struct mddev *mddev)
9381 {
9382 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) {
9383 /* Write superblock - thread that called mddev_suspend()
9384 * holds reconfig_mutex for us.
9385 */
9386 set_bit(MD_UPDATING_SB, &mddev->flags);
9387 smp_mb__after_atomic();
9388 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags))
9389 md_update_sb(mddev, 0);
9390 clear_bit_unlock(MD_UPDATING_SB, &mddev->flags);
9391 wake_up(&mddev->sb_wait);
9392 }
9393
9394 if (is_md_suspended(mddev))
9395 return;
9396
9397 if (mddev->bitmap)
9398 md_bitmap_daemon_work(mddev);
9399
9400 if (signal_pending(current)) {
9401 if (mddev->pers->sync_request && !mddev->external) {
9402 pr_debug("md: %s in immediate safe mode\n",
9403 mdname(mddev));
9404 mddev->safemode = 2;
9405 }
9406 flush_signals(current);
9407 }
9408
9409 if (!md_is_rdwr(mddev) &&
9410 !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
9411 return;
9412 if ( ! (
9413 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
9414 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9415 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
9416 (mddev->external == 0 && mddev->safemode == 1) ||
9417 (mddev->safemode == 2
9418 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
9419 ))
9420 return;
9421
9422 if (mddev_trylock(mddev)) {
9423 int spares = 0;
9424 bool try_set_sync = mddev->safemode != 0;
9425
9426 if (!mddev->external && mddev->safemode == 1)
9427 mddev->safemode = 0;
9428
9429 if (!md_is_rdwr(mddev)) {
9430 struct md_rdev *rdev;
9431 if (!mddev->external && mddev->in_sync)
9432 /* 'Blocked' flag not needed as failed devices
9433 * will be recorded if array switched to read/write.
9434 * Leaving it set will prevent the device
9435 * from being removed.
9436 */
9437 rdev_for_each(rdev, mddev)
9438 clear_bit(Blocked, &rdev->flags);
9439 /* On a read-only array we can:
9440 * - remove failed devices
9441 * - add already-in_sync devices if the array itself
9442 * is in-sync.
9443 * As we only add devices that are already in-sync,
9444 * we can activate the spares immediately.
9445 */
9446 remove_and_add_spares(mddev, NULL);
9447 /* There is no thread, but we need to call
9448 * ->spare_active and clear saved_raid_disk
9449 */
9450 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
9451 md_reap_sync_thread(mddev);
9452 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9453 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9454 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
9455 goto unlock;
9456 }
9457
9458 if (mddev_is_clustered(mddev)) {
9459 struct md_rdev *rdev, *tmp;
9460 /* kick the device if another node issued a
9461 * remove disk.
9462 */
9463 rdev_for_each_safe(rdev, tmp, mddev) {
9464 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
9465 rdev->raid_disk < 0)
9466 md_kick_rdev_from_array(rdev);
9467 }
9468 }
9469
9470 if (try_set_sync && !mddev->external && !mddev->in_sync) {
9471 spin_lock(&mddev->lock);
9472 set_in_sync(mddev);
9473 spin_unlock(&mddev->lock);
9474 }
9475
9476 if (mddev->sb_flags)
9477 md_update_sb(mddev, 0);
9478
9479 /*
9480 * Never start a new sync thread if MD_RECOVERY_RUNNING is
9481 * still set.
9482 */
9483 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
9484 if (!test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
9485 /* resync/recovery still happening */
9486 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9487 goto unlock;
9488 }
9489
9490 if (WARN_ON_ONCE(!mddev->sync_thread))
9491 goto unlock;
9492
9493 md_reap_sync_thread(mddev);
9494 goto unlock;
9495 }
9496
9497 /* Set RUNNING before clearing NEEDED to avoid
9498 * any transients in the value of "sync_action".
9499 */
9500 mddev->curr_resync_completed = 0;
9501 spin_lock(&mddev->lock);
9502 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9503 spin_unlock(&mddev->lock);
9504 /* Clear some bits that don't mean anything, but
9505 * might be left set
9506 */
9507 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
9508 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9509
9510 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9511 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
9512 goto not_running;
9513 /* no recovery is running.
9514 * remove any failed drives, then
9515 * add spares if possible.
9516 * Spares are also removed and re-added, to allow
9517 * the personality to fail the re-add.
9518 */
9519
9520 if (mddev->reshape_position != MaxSector) {
9521 if (mddev->pers->check_reshape == NULL ||
9522 mddev->pers->check_reshape(mddev) != 0)
9523 /* Cannot proceed */
9524 goto not_running;
9525 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9526 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9527 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
9528 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9529 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9530 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9531 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9532 } else if (mddev->recovery_cp < MaxSector) {
9533 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9534 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9535 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
9536 /* nothing to be done ... */
9537 goto not_running;
9538
9539 if (mddev->pers->sync_request) {
9540 if (spares) {
9541 /* We are adding a device or devices to an array
9542 * which has the bitmap stored on all devices.
9543 * So make sure all bitmap pages get written
9544 */
9545 md_bitmap_write_all(mddev->bitmap);
9546 }
9547 queue_work(md_misc_wq, &mddev->sync_work);
9548 goto unlock;
9549 }
9550 not_running:
9551 if (!mddev->sync_thread) {
9552 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9553 wake_up(&resync_wait);
9554 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9555 &mddev->recovery))
9556 if (mddev->sysfs_action)
9557 sysfs_notify_dirent_safe(mddev->sysfs_action);
9558 }
9559 unlock:
9560 wake_up(&mddev->sb_wait);
9561 mddev_unlock(mddev);
9562 }
9563 }
9564 EXPORT_SYMBOL(md_check_recovery);
9565
md_reap_sync_thread(struct mddev * mddev)9566 void md_reap_sync_thread(struct mddev *mddev)
9567 {
9568 struct md_rdev *rdev;
9569 sector_t old_dev_sectors = mddev->dev_sectors;
9570 bool is_reshaped = false;
9571
9572 /* resync has finished, collect result */
9573 md_unregister_thread(mddev, &mddev->sync_thread);
9574 atomic_inc(&mddev->sync_seq);
9575
9576 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9577 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
9578 mddev->degraded != mddev->raid_disks) {
9579 /* success...*/
9580 /* activate any spares */
9581 if (mddev->pers->spare_active(mddev)) {
9582 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9583 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9584 }
9585 }
9586 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9587 mddev->pers->finish_reshape) {
9588 mddev->pers->finish_reshape(mddev);
9589 if (mddev_is_clustered(mddev))
9590 is_reshaped = true;
9591 }
9592
9593 /* If array is no-longer degraded, then any saved_raid_disk
9594 * information must be scrapped.
9595 */
9596 if (!mddev->degraded)
9597 rdev_for_each(rdev, mddev)
9598 rdev->saved_raid_disk = -1;
9599
9600 md_update_sb(mddev, 1);
9601 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9602 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9603 * clustered raid */
9604 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
9605 md_cluster_ops->resync_finish(mddev);
9606 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9607 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9608 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9609 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9610 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9611 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9612 /*
9613 * We call md_cluster_ops->update_size here because sync_size could
9614 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9615 * so it is time to update size across cluster.
9616 */
9617 if (mddev_is_clustered(mddev) && is_reshaped
9618 && !test_bit(MD_CLOSING, &mddev->flags))
9619 md_cluster_ops->update_size(mddev, old_dev_sectors);
9620 /* flag recovery needed just to double check */
9621 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9622 sysfs_notify_dirent_safe(mddev->sysfs_completed);
9623 sysfs_notify_dirent_safe(mddev->sysfs_action);
9624 md_new_event();
9625 if (mddev->event_work.func)
9626 queue_work(md_misc_wq, &mddev->event_work);
9627 wake_up(&resync_wait);
9628 }
9629 EXPORT_SYMBOL(md_reap_sync_thread);
9630
md_wait_for_blocked_rdev(struct md_rdev * rdev,struct mddev * mddev)9631 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9632 {
9633 sysfs_notify_dirent_safe(rdev->sysfs_state);
9634 wait_event_timeout(rdev->blocked_wait,
9635 !test_bit(Blocked, &rdev->flags) &&
9636 !test_bit(BlockedBadBlocks, &rdev->flags),
9637 msecs_to_jiffies(5000));
9638 rdev_dec_pending(rdev, mddev);
9639 }
9640 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9641
md_finish_reshape(struct mddev * mddev)9642 void md_finish_reshape(struct mddev *mddev)
9643 {
9644 /* called be personality module when reshape completes. */
9645 struct md_rdev *rdev;
9646
9647 rdev_for_each(rdev, mddev) {
9648 if (rdev->data_offset > rdev->new_data_offset)
9649 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9650 else
9651 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9652 rdev->data_offset = rdev->new_data_offset;
9653 }
9654 }
9655 EXPORT_SYMBOL(md_finish_reshape);
9656
9657 /* Bad block management */
9658
9659 /* Returns 1 on success, 0 on failure */
rdev_set_badblocks(struct md_rdev * rdev,sector_t s,int sectors,int is_new)9660 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9661 int is_new)
9662 {
9663 struct mddev *mddev = rdev->mddev;
9664 int rv;
9665 if (is_new)
9666 s += rdev->new_data_offset;
9667 else
9668 s += rdev->data_offset;
9669 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9670 if (rv == 0) {
9671 /* Make sure they get written out promptly */
9672 if (test_bit(ExternalBbl, &rdev->flags))
9673 sysfs_notify_dirent_safe(rdev->sysfs_unack_badblocks);
9674 sysfs_notify_dirent_safe(rdev->sysfs_state);
9675 set_mask_bits(&mddev->sb_flags, 0,
9676 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9677 md_wakeup_thread(rdev->mddev->thread);
9678 return 1;
9679 } else
9680 return 0;
9681 }
9682 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9683
rdev_clear_badblocks(struct md_rdev * rdev,sector_t s,int sectors,int is_new)9684 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9685 int is_new)
9686 {
9687 int rv;
9688 if (is_new)
9689 s += rdev->new_data_offset;
9690 else
9691 s += rdev->data_offset;
9692 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9693 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9694 sysfs_notify_dirent_safe(rdev->sysfs_badblocks);
9695 return rv;
9696 }
9697 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9698
md_notify_reboot(struct notifier_block * this,unsigned long code,void * x)9699 static int md_notify_reboot(struct notifier_block *this,
9700 unsigned long code, void *x)
9701 {
9702 struct mddev *mddev, *n;
9703 int need_delay = 0;
9704
9705 spin_lock(&all_mddevs_lock);
9706 list_for_each_entry_safe(mddev, n, &all_mddevs, all_mddevs) {
9707 if (!mddev_get(mddev))
9708 continue;
9709 spin_unlock(&all_mddevs_lock);
9710 if (mddev_trylock(mddev)) {
9711 if (mddev->pers)
9712 __md_stop_writes(mddev);
9713 if (mddev->persistent)
9714 mddev->safemode = 2;
9715 mddev_unlock(mddev);
9716 }
9717 need_delay = 1;
9718 mddev_put(mddev);
9719 spin_lock(&all_mddevs_lock);
9720 }
9721 spin_unlock(&all_mddevs_lock);
9722
9723 /*
9724 * certain more exotic SCSI devices are known to be
9725 * volatile wrt too early system reboots. While the
9726 * right place to handle this issue is the given
9727 * driver, we do want to have a safe RAID driver ...
9728 */
9729 if (need_delay)
9730 msleep(1000);
9731
9732 return NOTIFY_DONE;
9733 }
9734
9735 static struct notifier_block md_notifier = {
9736 .notifier_call = md_notify_reboot,
9737 .next = NULL,
9738 .priority = INT_MAX, /* before any real devices */
9739 };
9740
md_geninit(void)9741 static void md_geninit(void)
9742 {
9743 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9744
9745 proc_create("mdstat", S_IRUGO, NULL, &mdstat_proc_ops);
9746 }
9747
md_init(void)9748 static int __init md_init(void)
9749 {
9750 int ret = -ENOMEM;
9751
9752 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9753 if (!md_wq)
9754 goto err_wq;
9755
9756 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9757 if (!md_misc_wq)
9758 goto err_misc_wq;
9759
9760 md_bitmap_wq = alloc_workqueue("md_bitmap", WQ_MEM_RECLAIM | WQ_UNBOUND,
9761 0);
9762 if (!md_bitmap_wq)
9763 goto err_bitmap_wq;
9764
9765 ret = __register_blkdev(MD_MAJOR, "md", md_probe);
9766 if (ret < 0)
9767 goto err_md;
9768
9769 ret = __register_blkdev(0, "mdp", md_probe);
9770 if (ret < 0)
9771 goto err_mdp;
9772 mdp_major = ret;
9773
9774 register_reboot_notifier(&md_notifier);
9775 raid_table_header = register_sysctl("dev/raid", raid_table);
9776
9777 md_geninit();
9778 return 0;
9779
9780 err_mdp:
9781 unregister_blkdev(MD_MAJOR, "md");
9782 err_md:
9783 destroy_workqueue(md_bitmap_wq);
9784 err_bitmap_wq:
9785 destroy_workqueue(md_misc_wq);
9786 err_misc_wq:
9787 destroy_workqueue(md_wq);
9788 err_wq:
9789 return ret;
9790 }
9791
check_sb_changes(struct mddev * mddev,struct md_rdev * rdev)9792 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9793 {
9794 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9795 struct md_rdev *rdev2, *tmp;
9796 int role, ret;
9797
9798 /*
9799 * If size is changed in another node then we need to
9800 * do resize as well.
9801 */
9802 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9803 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9804 if (ret)
9805 pr_info("md-cluster: resize failed\n");
9806 else
9807 md_bitmap_update_sb(mddev->bitmap);
9808 }
9809
9810 /* Check for change of roles in the active devices */
9811 rdev_for_each_safe(rdev2, tmp, mddev) {
9812 if (test_bit(Faulty, &rdev2->flags))
9813 continue;
9814
9815 /* Check if the roles changed */
9816 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9817
9818 if (test_bit(Candidate, &rdev2->flags)) {
9819 if (role == MD_DISK_ROLE_FAULTY) {
9820 pr_info("md: Removing Candidate device %pg because add failed\n",
9821 rdev2->bdev);
9822 md_kick_rdev_from_array(rdev2);
9823 continue;
9824 }
9825 else
9826 clear_bit(Candidate, &rdev2->flags);
9827 }
9828
9829 if (role != rdev2->raid_disk) {
9830 /*
9831 * got activated except reshape is happening.
9832 */
9833 if (rdev2->raid_disk == -1 && role != MD_DISK_ROLE_SPARE &&
9834 !(le32_to_cpu(sb->feature_map) &
9835 MD_FEATURE_RESHAPE_ACTIVE)) {
9836 rdev2->saved_raid_disk = role;
9837 ret = remove_and_add_spares(mddev, rdev2);
9838 pr_info("Activated spare: %pg\n",
9839 rdev2->bdev);
9840 /* wakeup mddev->thread here, so array could
9841 * perform resync with the new activated disk */
9842 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9843 md_wakeup_thread(mddev->thread);
9844 }
9845 /* device faulty
9846 * We just want to do the minimum to mark the disk
9847 * as faulty. The recovery is performed by the
9848 * one who initiated the error.
9849 */
9850 if (role == MD_DISK_ROLE_FAULTY ||
9851 role == MD_DISK_ROLE_JOURNAL) {
9852 md_error(mddev, rdev2);
9853 clear_bit(Blocked, &rdev2->flags);
9854 }
9855 }
9856 }
9857
9858 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) {
9859 ret = update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9860 if (ret)
9861 pr_warn("md: updating array disks failed. %d\n", ret);
9862 }
9863
9864 /*
9865 * Since mddev->delta_disks has already updated in update_raid_disks,
9866 * so it is time to check reshape.
9867 */
9868 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9869 (le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9870 /*
9871 * reshape is happening in the remote node, we need to
9872 * update reshape_position and call start_reshape.
9873 */
9874 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
9875 if (mddev->pers->update_reshape_pos)
9876 mddev->pers->update_reshape_pos(mddev);
9877 if (mddev->pers->start_reshape)
9878 mddev->pers->start_reshape(mddev);
9879 } else if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9880 mddev->reshape_position != MaxSector &&
9881 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9882 /* reshape is just done in another node. */
9883 mddev->reshape_position = MaxSector;
9884 if (mddev->pers->update_reshape_pos)
9885 mddev->pers->update_reshape_pos(mddev);
9886 }
9887
9888 /* Finally set the event to be up to date */
9889 mddev->events = le64_to_cpu(sb->events);
9890 }
9891
read_rdev(struct mddev * mddev,struct md_rdev * rdev)9892 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9893 {
9894 int err;
9895 struct page *swapout = rdev->sb_page;
9896 struct mdp_superblock_1 *sb;
9897
9898 /* Store the sb page of the rdev in the swapout temporary
9899 * variable in case we err in the future
9900 */
9901 rdev->sb_page = NULL;
9902 err = alloc_disk_sb(rdev);
9903 if (err == 0) {
9904 ClearPageUptodate(rdev->sb_page);
9905 rdev->sb_loaded = 0;
9906 err = super_types[mddev->major_version].
9907 load_super(rdev, NULL, mddev->minor_version);
9908 }
9909 if (err < 0) {
9910 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9911 __func__, __LINE__, rdev->desc_nr, err);
9912 if (rdev->sb_page)
9913 put_page(rdev->sb_page);
9914 rdev->sb_page = swapout;
9915 rdev->sb_loaded = 1;
9916 return err;
9917 }
9918
9919 sb = page_address(rdev->sb_page);
9920 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9921 * is not set
9922 */
9923
9924 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9925 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9926
9927 /* The other node finished recovery, call spare_active to set
9928 * device In_sync and mddev->degraded
9929 */
9930 if (rdev->recovery_offset == MaxSector &&
9931 !test_bit(In_sync, &rdev->flags) &&
9932 mddev->pers->spare_active(mddev))
9933 sysfs_notify_dirent_safe(mddev->sysfs_degraded);
9934
9935 put_page(swapout);
9936 return 0;
9937 }
9938
md_reload_sb(struct mddev * mddev,int nr)9939 void md_reload_sb(struct mddev *mddev, int nr)
9940 {
9941 struct md_rdev *rdev = NULL, *iter;
9942 int err;
9943
9944 /* Find the rdev */
9945 rdev_for_each_rcu(iter, mddev) {
9946 if (iter->desc_nr == nr) {
9947 rdev = iter;
9948 break;
9949 }
9950 }
9951
9952 if (!rdev) {
9953 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9954 return;
9955 }
9956
9957 err = read_rdev(mddev, rdev);
9958 if (err < 0)
9959 return;
9960
9961 check_sb_changes(mddev, rdev);
9962
9963 /* Read all rdev's to update recovery_offset */
9964 rdev_for_each_rcu(rdev, mddev) {
9965 if (!test_bit(Faulty, &rdev->flags))
9966 read_rdev(mddev, rdev);
9967 }
9968 }
9969 EXPORT_SYMBOL(md_reload_sb);
9970
9971 #ifndef MODULE
9972
9973 /*
9974 * Searches all registered partitions for autorun RAID arrays
9975 * at boot time.
9976 */
9977
9978 static DEFINE_MUTEX(detected_devices_mutex);
9979 static LIST_HEAD(all_detected_devices);
9980 struct detected_devices_node {
9981 struct list_head list;
9982 dev_t dev;
9983 };
9984
md_autodetect_dev(dev_t dev)9985 void md_autodetect_dev(dev_t dev)
9986 {
9987 struct detected_devices_node *node_detected_dev;
9988
9989 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9990 if (node_detected_dev) {
9991 node_detected_dev->dev = dev;
9992 mutex_lock(&detected_devices_mutex);
9993 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9994 mutex_unlock(&detected_devices_mutex);
9995 }
9996 }
9997
md_autostart_arrays(int part)9998 void md_autostart_arrays(int part)
9999 {
10000 struct md_rdev *rdev;
10001 struct detected_devices_node *node_detected_dev;
10002 dev_t dev;
10003 int i_scanned, i_passed;
10004
10005 i_scanned = 0;
10006 i_passed = 0;
10007
10008 pr_info("md: Autodetecting RAID arrays.\n");
10009
10010 mutex_lock(&detected_devices_mutex);
10011 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
10012 i_scanned++;
10013 node_detected_dev = list_entry(all_detected_devices.next,
10014 struct detected_devices_node, list);
10015 list_del(&node_detected_dev->list);
10016 dev = node_detected_dev->dev;
10017 kfree(node_detected_dev);
10018 mutex_unlock(&detected_devices_mutex);
10019 rdev = md_import_device(dev,0, 90);
10020 mutex_lock(&detected_devices_mutex);
10021 if (IS_ERR(rdev))
10022 continue;
10023
10024 if (test_bit(Faulty, &rdev->flags))
10025 continue;
10026
10027 set_bit(AutoDetected, &rdev->flags);
10028 list_add(&rdev->same_set, &pending_raid_disks);
10029 i_passed++;
10030 }
10031 mutex_unlock(&detected_devices_mutex);
10032
10033 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
10034
10035 autorun_devices(part);
10036 }
10037
10038 #endif /* !MODULE */
10039
md_exit(void)10040 static __exit void md_exit(void)
10041 {
10042 struct mddev *mddev, *n;
10043 int delay = 1;
10044
10045 unregister_blkdev(MD_MAJOR,"md");
10046 unregister_blkdev(mdp_major, "mdp");
10047 unregister_reboot_notifier(&md_notifier);
10048 unregister_sysctl_table(raid_table_header);
10049
10050 /* We cannot unload the modules while some process is
10051 * waiting for us in select() or poll() - wake them up
10052 */
10053 md_unloading = 1;
10054 while (waitqueue_active(&md_event_waiters)) {
10055 /* not safe to leave yet */
10056 wake_up(&md_event_waiters);
10057 msleep(delay);
10058 delay += delay;
10059 }
10060 remove_proc_entry("mdstat", NULL);
10061
10062 spin_lock(&all_mddevs_lock);
10063 list_for_each_entry_safe(mddev, n, &all_mddevs, all_mddevs) {
10064 if (!mddev_get(mddev))
10065 continue;
10066 spin_unlock(&all_mddevs_lock);
10067 export_array(mddev);
10068 mddev->ctime = 0;
10069 mddev->hold_active = 0;
10070 /*
10071 * As the mddev is now fully clear, mddev_put will schedule
10072 * the mddev for destruction by a workqueue, and the
10073 * destroy_workqueue() below will wait for that to complete.
10074 */
10075 mddev_put(mddev);
10076 spin_lock(&all_mddevs_lock);
10077 }
10078 spin_unlock(&all_mddevs_lock);
10079
10080 destroy_workqueue(md_misc_wq);
10081 destroy_workqueue(md_bitmap_wq);
10082 destroy_workqueue(md_wq);
10083 }
10084
10085 subsys_initcall(md_init);
module_exit(md_exit)10086 module_exit(md_exit)
10087
10088 static int get_ro(char *buffer, const struct kernel_param *kp)
10089 {
10090 return sprintf(buffer, "%d\n", start_readonly);
10091 }
set_ro(const char * val,const struct kernel_param * kp)10092 static int set_ro(const char *val, const struct kernel_param *kp)
10093 {
10094 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
10095 }
10096
10097 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
10098 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
10099 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
10100 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
10101
10102 MODULE_LICENSE("GPL");
10103 MODULE_DESCRIPTION("MD RAID framework");
10104 MODULE_ALIAS("md");
10105 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
10106