2 * raid5.c : Multiple Devices driver for Linux
3 * Copyright (C) 1996, 1997 Ingo Molnar, Miguel de Icaza, Gadi Oxman
4 * Copyright (C) 1999, 2000 Ingo Molnar
5 * Copyright (C) 2002, 2003 H. Peter Anvin
7 * RAID-4/5/6 management functions.
8 * Thanks to Penguin Computing for making the RAID-6 development possible
9 * by donating a test server!
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2, or (at your option)
16 * You should have received a copy of the GNU General Public License
17 * (for example /usr/src/linux/COPYING); if not, write to the Free
18 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 * The sequencing for updating the bitmap reliably is a little
25 * subtle (and I got it wrong the first time) so it deserves some
28 * We group bitmap updates into batches. Each batch has a number.
29 * We may write out several batches at once, but that isn't very important.
30 * conf->seq_write is the number of the last batch successfully written.
31 * conf->seq_flush is the number of the last batch that was closed to
33 * When we discover that we will need to write to any block in a stripe
34 * (in add_stripe_bio) we update the in-memory bitmap and record in sh->bm_seq
35 * the number of the batch it will be in. This is seq_flush+1.
36 * When we are ready to do a write, if that batch hasn't been written yet,
37 * we plug the array and queue the stripe for later.
38 * When an unplug happens, we increment bm_flush, thus closing the current
40 * When we notice that bm_flush > bm_write, we write out all pending updates
41 * to the bitmap, and advance bm_write to where bm_flush was.
42 * This may occasionally write a bit out twice, but is sure never to
46 #include <linux/blkdev.h>
47 #include <linux/kthread.h>
48 #include <linux/raid/pq.h>
49 #include <linux/async_tx.h>
50 #include <linux/module.h>
51 #include <linux/async.h>
52 #include <linux/seq_file.h>
53 #include <linux/cpu.h>
54 #include <linux/slab.h>
55 #include <linux/ratelimit.h>
56 #include <linux/nodemask.h>
57 #include <linux/flex_array.h>
58 #include <linux/sched/signal.h>
60 #include <trace/events/block.h>
67 #define UNSUPPORTED_MDDEV_FLAGS (1L << MD_FAILFAST_SUPPORTED)
69 #define cpu_to_group(cpu) cpu_to_node(cpu)
70 #define ANY_GROUP NUMA_NO_NODE
72 static bool devices_handle_discard_safely
= false;
73 module_param(devices_handle_discard_safely
, bool, 0644);
74 MODULE_PARM_DESC(devices_handle_discard_safely
,
75 "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions");
76 static struct workqueue_struct
*raid5_wq
;
78 static inline struct hlist_head
*stripe_hash(struct r5conf
*conf
, sector_t sect
)
80 int hash
= (sect
>> STRIPE_SHIFT
) & HASH_MASK
;
81 return &conf
->stripe_hashtbl
[hash
];
84 static inline int stripe_hash_locks_hash(sector_t sect
)
86 return (sect
>> STRIPE_SHIFT
) & STRIPE_HASH_LOCKS_MASK
;
89 static inline void lock_device_hash_lock(struct r5conf
*conf
, int hash
)
91 spin_lock_irq(conf
->hash_locks
+ hash
);
92 spin_lock(&conf
->device_lock
);
95 static inline void unlock_device_hash_lock(struct r5conf
*conf
, int hash
)
97 spin_unlock(&conf
->device_lock
);
98 spin_unlock_irq(conf
->hash_locks
+ hash
);
101 static inline void lock_all_device_hash_locks_irq(struct r5conf
*conf
)
105 spin_lock(conf
->hash_locks
);
106 for (i
= 1; i
< NR_STRIPE_HASH_LOCKS
; i
++)
107 spin_lock_nest_lock(conf
->hash_locks
+ i
, conf
->hash_locks
);
108 spin_lock(&conf
->device_lock
);
111 static inline void unlock_all_device_hash_locks_irq(struct r5conf
*conf
)
114 spin_unlock(&conf
->device_lock
);
115 for (i
= NR_STRIPE_HASH_LOCKS
; i
; i
--)
116 spin_unlock(conf
->hash_locks
+ i
- 1);
120 /* Find first data disk in a raid6 stripe */
121 static inline int raid6_d0(struct stripe_head
*sh
)
124 /* ddf always start from first device */
126 /* md starts just after Q block */
127 if (sh
->qd_idx
== sh
->disks
- 1)
130 return sh
->qd_idx
+ 1;
132 static inline int raid6_next_disk(int disk
, int raid_disks
)
135 return (disk
< raid_disks
) ? disk
: 0;
138 /* When walking through the disks in a raid5, starting at raid6_d0,
139 * We need to map each disk to a 'slot', where the data disks are slot
140 * 0 .. raid_disks-3, the parity disk is raid_disks-2 and the Q disk
141 * is raid_disks-1. This help does that mapping.
143 static int raid6_idx_to_slot(int idx
, struct stripe_head
*sh
,
144 int *count
, int syndrome_disks
)
150 if (idx
== sh
->pd_idx
)
151 return syndrome_disks
;
152 if (idx
== sh
->qd_idx
)
153 return syndrome_disks
+ 1;
159 static void return_io(struct bio_list
*return_bi
)
162 while ((bi
= bio_list_pop(return_bi
)) != NULL
) {
163 bi
->bi_iter
.bi_size
= 0;
164 trace_block_bio_complete(bdev_get_queue(bi
->bi_bdev
),
170 static void print_raid5_conf (struct r5conf
*conf
);
172 static int stripe_operations_active(struct stripe_head
*sh
)
174 return sh
->check_state
|| sh
->reconstruct_state
||
175 test_bit(STRIPE_BIOFILL_RUN
, &sh
->state
) ||
176 test_bit(STRIPE_COMPUTE_RUN
, &sh
->state
);
179 static void raid5_wakeup_stripe_thread(struct stripe_head
*sh
)
181 struct r5conf
*conf
= sh
->raid_conf
;
182 struct r5worker_group
*group
;
184 int i
, cpu
= sh
->cpu
;
186 if (!cpu_online(cpu
)) {
187 cpu
= cpumask_any(cpu_online_mask
);
191 if (list_empty(&sh
->lru
)) {
192 struct r5worker_group
*group
;
193 group
= conf
->worker_groups
+ cpu_to_group(cpu
);
194 list_add_tail(&sh
->lru
, &group
->handle_list
);
195 group
->stripes_cnt
++;
199 if (conf
->worker_cnt_per_group
== 0) {
200 md_wakeup_thread(conf
->mddev
->thread
);
204 group
= conf
->worker_groups
+ cpu_to_group(sh
->cpu
);
206 group
->workers
[0].working
= true;
207 /* at least one worker should run to avoid race */
208 queue_work_on(sh
->cpu
, raid5_wq
, &group
->workers
[0].work
);
210 thread_cnt
= group
->stripes_cnt
/ MAX_STRIPE_BATCH
- 1;
211 /* wakeup more workers */
212 for (i
= 1; i
< conf
->worker_cnt_per_group
&& thread_cnt
> 0; i
++) {
213 if (group
->workers
[i
].working
== false) {
214 group
->workers
[i
].working
= true;
215 queue_work_on(sh
->cpu
, raid5_wq
,
216 &group
->workers
[i
].work
);
222 static void do_release_stripe(struct r5conf
*conf
, struct stripe_head
*sh
,
223 struct list_head
*temp_inactive_list
)
226 int injournal
= 0; /* number of date pages with R5_InJournal */
228 BUG_ON(!list_empty(&sh
->lru
));
229 BUG_ON(atomic_read(&conf
->active_stripes
)==0);
231 if (r5c_is_writeback(conf
->log
))
232 for (i
= sh
->disks
; i
--; )
233 if (test_bit(R5_InJournal
, &sh
->dev
[i
].flags
))
236 * When quiesce in r5c write back, set STRIPE_HANDLE for stripes with
237 * data in journal, so they are not released to cached lists
239 if (conf
->quiesce
&& r5c_is_writeback(conf
->log
) &&
240 !test_bit(STRIPE_HANDLE
, &sh
->state
) && injournal
!= 0) {
241 if (test_bit(STRIPE_R5C_CACHING
, &sh
->state
))
242 r5c_make_stripe_write_out(sh
);
243 set_bit(STRIPE_HANDLE
, &sh
->state
);
246 if (test_bit(STRIPE_HANDLE
, &sh
->state
)) {
247 if (test_bit(STRIPE_DELAYED
, &sh
->state
) &&
248 !test_bit(STRIPE_PREREAD_ACTIVE
, &sh
->state
))
249 list_add_tail(&sh
->lru
, &conf
->delayed_list
);
250 else if (test_bit(STRIPE_BIT_DELAY
, &sh
->state
) &&
251 sh
->bm_seq
- conf
->seq_write
> 0)
252 list_add_tail(&sh
->lru
, &conf
->bitmap_list
);
254 clear_bit(STRIPE_DELAYED
, &sh
->state
);
255 clear_bit(STRIPE_BIT_DELAY
, &sh
->state
);
256 if (conf
->worker_cnt_per_group
== 0) {
257 list_add_tail(&sh
->lru
, &conf
->handle_list
);
259 raid5_wakeup_stripe_thread(sh
);
263 md_wakeup_thread(conf
->mddev
->thread
);
265 BUG_ON(stripe_operations_active(sh
));
266 if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE
, &sh
->state
))
267 if (atomic_dec_return(&conf
->preread_active_stripes
)
269 md_wakeup_thread(conf
->mddev
->thread
);
270 atomic_dec(&conf
->active_stripes
);
271 if (!test_bit(STRIPE_EXPANDING
, &sh
->state
)) {
272 if (!r5c_is_writeback(conf
->log
))
273 list_add_tail(&sh
->lru
, temp_inactive_list
);
275 WARN_ON(test_bit(R5_InJournal
, &sh
->dev
[sh
->pd_idx
].flags
));
277 list_add_tail(&sh
->lru
, temp_inactive_list
);
278 else if (injournal
== conf
->raid_disks
- conf
->max_degraded
) {
280 if (!test_and_set_bit(STRIPE_R5C_FULL_STRIPE
, &sh
->state
))
281 atomic_inc(&conf
->r5c_cached_full_stripes
);
282 if (test_and_clear_bit(STRIPE_R5C_PARTIAL_STRIPE
, &sh
->state
))
283 atomic_dec(&conf
->r5c_cached_partial_stripes
);
284 list_add_tail(&sh
->lru
, &conf
->r5c_full_stripe_list
);
285 r5c_check_cached_full_stripe(conf
);
288 * STRIPE_R5C_PARTIAL_STRIPE is set in
289 * r5c_try_caching_write(). No need to
292 list_add_tail(&sh
->lru
, &conf
->r5c_partial_stripe_list
);
298 static void __release_stripe(struct r5conf
*conf
, struct stripe_head
*sh
,
299 struct list_head
*temp_inactive_list
)
301 if (atomic_dec_and_test(&sh
->count
))
302 do_release_stripe(conf
, sh
, temp_inactive_list
);
306 * @hash could be NR_STRIPE_HASH_LOCKS, then we have a list of inactive_list
308 * Be careful: Only one task can add/delete stripes from temp_inactive_list at
309 * given time. Adding stripes only takes device lock, while deleting stripes
310 * only takes hash lock.
312 static void release_inactive_stripe_list(struct r5conf
*conf
,
313 struct list_head
*temp_inactive_list
,
317 bool do_wakeup
= false;
320 if (hash
== NR_STRIPE_HASH_LOCKS
) {
321 size
= NR_STRIPE_HASH_LOCKS
;
322 hash
= NR_STRIPE_HASH_LOCKS
- 1;
326 struct list_head
*list
= &temp_inactive_list
[size
- 1];
329 * We don't hold any lock here yet, raid5_get_active_stripe() might
330 * remove stripes from the list
332 if (!list_empty_careful(list
)) {
333 spin_lock_irqsave(conf
->hash_locks
+ hash
, flags
);
334 if (list_empty(conf
->inactive_list
+ hash
) &&
336 atomic_dec(&conf
->empty_inactive_list_nr
);
337 list_splice_tail_init(list
, conf
->inactive_list
+ hash
);
339 spin_unlock_irqrestore(conf
->hash_locks
+ hash
, flags
);
346 wake_up(&conf
->wait_for_stripe
);
347 if (atomic_read(&conf
->active_stripes
) == 0)
348 wake_up(&conf
->wait_for_quiescent
);
349 if (conf
->retry_read_aligned
)
350 md_wakeup_thread(conf
->mddev
->thread
);
354 /* should hold conf->device_lock already */
355 static int release_stripe_list(struct r5conf
*conf
,
356 struct list_head
*temp_inactive_list
)
358 struct stripe_head
*sh
, *t
;
360 struct llist_node
*head
;
362 head
= llist_del_all(&conf
->released_stripes
);
363 head
= llist_reverse_order(head
);
364 llist_for_each_entry_safe(sh
, t
, head
, release_list
) {
367 /* sh could be readded after STRIPE_ON_RELEASE_LIST is cleard */
369 clear_bit(STRIPE_ON_RELEASE_LIST
, &sh
->state
);
371 * Don't worry the bit is set here, because if the bit is set
372 * again, the count is always > 1. This is true for
373 * STRIPE_ON_UNPLUG_LIST bit too.
375 hash
= sh
->hash_lock_index
;
376 __release_stripe(conf
, sh
, &temp_inactive_list
[hash
]);
383 void raid5_release_stripe(struct stripe_head
*sh
)
385 struct r5conf
*conf
= sh
->raid_conf
;
387 struct list_head list
;
391 /* Avoid release_list until the last reference.
393 if (atomic_add_unless(&sh
->count
, -1, 1))
396 if (unlikely(!conf
->mddev
->thread
) ||
397 test_and_set_bit(STRIPE_ON_RELEASE_LIST
, &sh
->state
))
399 wakeup
= llist_add(&sh
->release_list
, &conf
->released_stripes
);
401 md_wakeup_thread(conf
->mddev
->thread
);
404 local_irq_save(flags
);
405 /* we are ok here if STRIPE_ON_RELEASE_LIST is set or not */
406 if (atomic_dec_and_lock(&sh
->count
, &conf
->device_lock
)) {
407 INIT_LIST_HEAD(&list
);
408 hash
= sh
->hash_lock_index
;
409 do_release_stripe(conf
, sh
, &list
);
410 spin_unlock(&conf
->device_lock
);
411 release_inactive_stripe_list(conf
, &list
, hash
);
413 local_irq_restore(flags
);
416 static inline void remove_hash(struct stripe_head
*sh
)
418 pr_debug("remove_hash(), stripe %llu\n",
419 (unsigned long long)sh
->sector
);
421 hlist_del_init(&sh
->hash
);
424 static inline void insert_hash(struct r5conf
*conf
, struct stripe_head
*sh
)
426 struct hlist_head
*hp
= stripe_hash(conf
, sh
->sector
);
428 pr_debug("insert_hash(), stripe %llu\n",
429 (unsigned long long)sh
->sector
);
431 hlist_add_head(&sh
->hash
, hp
);
434 /* find an idle stripe, make sure it is unhashed, and return it. */
435 static struct stripe_head
*get_free_stripe(struct r5conf
*conf
, int hash
)
437 struct stripe_head
*sh
= NULL
;
438 struct list_head
*first
;
440 if (list_empty(conf
->inactive_list
+ hash
))
442 first
= (conf
->inactive_list
+ hash
)->next
;
443 sh
= list_entry(first
, struct stripe_head
, lru
);
444 list_del_init(first
);
446 atomic_inc(&conf
->active_stripes
);
447 BUG_ON(hash
!= sh
->hash_lock_index
);
448 if (list_empty(conf
->inactive_list
+ hash
))
449 atomic_inc(&conf
->empty_inactive_list_nr
);
454 static void shrink_buffers(struct stripe_head
*sh
)
458 int num
= sh
->raid_conf
->pool_size
;
460 for (i
= 0; i
< num
; i
++) {
461 WARN_ON(sh
->dev
[i
].page
!= sh
->dev
[i
].orig_page
);
465 sh
->dev
[i
].page
= NULL
;
470 static int grow_buffers(struct stripe_head
*sh
, gfp_t gfp
)
473 int num
= sh
->raid_conf
->pool_size
;
475 for (i
= 0; i
< num
; i
++) {
478 if (!(page
= alloc_page(gfp
))) {
481 sh
->dev
[i
].page
= page
;
482 sh
->dev
[i
].orig_page
= page
;
487 static void raid5_build_block(struct stripe_head
*sh
, int i
, int previous
);
488 static void stripe_set_idx(sector_t stripe
, struct r5conf
*conf
, int previous
,
489 struct stripe_head
*sh
);
491 static void init_stripe(struct stripe_head
*sh
, sector_t sector
, int previous
)
493 struct r5conf
*conf
= sh
->raid_conf
;
496 BUG_ON(atomic_read(&sh
->count
) != 0);
497 BUG_ON(test_bit(STRIPE_HANDLE
, &sh
->state
));
498 BUG_ON(stripe_operations_active(sh
));
499 BUG_ON(sh
->batch_head
);
501 pr_debug("init_stripe called, stripe %llu\n",
502 (unsigned long long)sector
);
504 seq
= read_seqcount_begin(&conf
->gen_lock
);
505 sh
->generation
= conf
->generation
- previous
;
506 sh
->disks
= previous
? conf
->previous_raid_disks
: conf
->raid_disks
;
508 stripe_set_idx(sector
, conf
, previous
, sh
);
511 for (i
= sh
->disks
; i
--; ) {
512 struct r5dev
*dev
= &sh
->dev
[i
];
514 if (dev
->toread
|| dev
->read
|| dev
->towrite
|| dev
->written
||
515 test_bit(R5_LOCKED
, &dev
->flags
)) {
516 pr_err("sector=%llx i=%d %p %p %p %p %d\n",
517 (unsigned long long)sh
->sector
, i
, dev
->toread
,
518 dev
->read
, dev
->towrite
, dev
->written
,
519 test_bit(R5_LOCKED
, &dev
->flags
));
523 raid5_build_block(sh
, i
, previous
);
525 if (read_seqcount_retry(&conf
->gen_lock
, seq
))
527 sh
->overwrite_disks
= 0;
528 insert_hash(conf
, sh
);
529 sh
->cpu
= smp_processor_id();
530 set_bit(STRIPE_BATCH_READY
, &sh
->state
);
533 static struct stripe_head
*__find_stripe(struct r5conf
*conf
, sector_t sector
,
536 struct stripe_head
*sh
;
538 pr_debug("__find_stripe, sector %llu\n", (unsigned long long)sector
);
539 hlist_for_each_entry(sh
, stripe_hash(conf
, sector
), hash
)
540 if (sh
->sector
== sector
&& sh
->generation
== generation
)
542 pr_debug("__stripe %llu not in cache\n", (unsigned long long)sector
);
547 * Need to check if array has failed when deciding whether to:
549 * - remove non-faulty devices
552 * This determination is simple when no reshape is happening.
553 * However if there is a reshape, we need to carefully check
554 * both the before and after sections.
555 * This is because some failed devices may only affect one
556 * of the two sections, and some non-in_sync devices may
557 * be insync in the section most affected by failed devices.
559 int raid5_calc_degraded(struct r5conf
*conf
)
561 int degraded
, degraded2
;
566 for (i
= 0; i
< conf
->previous_raid_disks
; i
++) {
567 struct md_rdev
*rdev
= rcu_dereference(conf
->disks
[i
].rdev
);
568 if (rdev
&& test_bit(Faulty
, &rdev
->flags
))
569 rdev
= rcu_dereference(conf
->disks
[i
].replacement
);
570 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
572 else if (test_bit(In_sync
, &rdev
->flags
))
575 /* not in-sync or faulty.
576 * If the reshape increases the number of devices,
577 * this is being recovered by the reshape, so
578 * this 'previous' section is not in_sync.
579 * If the number of devices is being reduced however,
580 * the device can only be part of the array if
581 * we are reverting a reshape, so this section will
584 if (conf
->raid_disks
>= conf
->previous_raid_disks
)
588 if (conf
->raid_disks
== conf
->previous_raid_disks
)
592 for (i
= 0; i
< conf
->raid_disks
; i
++) {
593 struct md_rdev
*rdev
= rcu_dereference(conf
->disks
[i
].rdev
);
594 if (rdev
&& test_bit(Faulty
, &rdev
->flags
))
595 rdev
= rcu_dereference(conf
->disks
[i
].replacement
);
596 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
598 else if (test_bit(In_sync
, &rdev
->flags
))
601 /* not in-sync or faulty.
602 * If reshape increases the number of devices, this
603 * section has already been recovered, else it
604 * almost certainly hasn't.
606 if (conf
->raid_disks
<= conf
->previous_raid_disks
)
610 if (degraded2
> degraded
)
615 static int has_failed(struct r5conf
*conf
)
619 if (conf
->mddev
->reshape_position
== MaxSector
)
620 return conf
->mddev
->degraded
> conf
->max_degraded
;
622 degraded
= raid5_calc_degraded(conf
);
623 if (degraded
> conf
->max_degraded
)
629 raid5_get_active_stripe(struct r5conf
*conf
, sector_t sector
,
630 int previous
, int noblock
, int noquiesce
)
632 struct stripe_head
*sh
;
633 int hash
= stripe_hash_locks_hash(sector
);
634 int inc_empty_inactive_list_flag
;
636 pr_debug("get_stripe, sector %llu\n", (unsigned long long)sector
);
638 spin_lock_irq(conf
->hash_locks
+ hash
);
641 wait_event_lock_irq(conf
->wait_for_quiescent
,
642 conf
->quiesce
== 0 || noquiesce
,
643 *(conf
->hash_locks
+ hash
));
644 sh
= __find_stripe(conf
, sector
, conf
->generation
- previous
);
646 if (!test_bit(R5_INACTIVE_BLOCKED
, &conf
->cache_state
)) {
647 sh
= get_free_stripe(conf
, hash
);
648 if (!sh
&& !test_bit(R5_DID_ALLOC
,
650 set_bit(R5_ALLOC_MORE
,
653 if (noblock
&& sh
== NULL
)
656 r5c_check_stripe_cache_usage(conf
);
658 set_bit(R5_INACTIVE_BLOCKED
,
660 r5l_wake_reclaim(conf
->log
, 0);
662 conf
->wait_for_stripe
,
663 !list_empty(conf
->inactive_list
+ hash
) &&
664 (atomic_read(&conf
->active_stripes
)
665 < (conf
->max_nr_stripes
* 3 / 4)
666 || !test_bit(R5_INACTIVE_BLOCKED
,
667 &conf
->cache_state
)),
668 *(conf
->hash_locks
+ hash
));
669 clear_bit(R5_INACTIVE_BLOCKED
,
672 init_stripe(sh
, sector
, previous
);
673 atomic_inc(&sh
->count
);
675 } else if (!atomic_inc_not_zero(&sh
->count
)) {
676 spin_lock(&conf
->device_lock
);
677 if (!atomic_read(&sh
->count
)) {
678 if (!test_bit(STRIPE_HANDLE
, &sh
->state
))
679 atomic_inc(&conf
->active_stripes
);
680 BUG_ON(list_empty(&sh
->lru
) &&
681 !test_bit(STRIPE_EXPANDING
, &sh
->state
));
682 inc_empty_inactive_list_flag
= 0;
683 if (!list_empty(conf
->inactive_list
+ hash
))
684 inc_empty_inactive_list_flag
= 1;
685 list_del_init(&sh
->lru
);
686 if (list_empty(conf
->inactive_list
+ hash
) && inc_empty_inactive_list_flag
)
687 atomic_inc(&conf
->empty_inactive_list_nr
);
689 sh
->group
->stripes_cnt
--;
693 atomic_inc(&sh
->count
);
694 spin_unlock(&conf
->device_lock
);
696 } while (sh
== NULL
);
698 spin_unlock_irq(conf
->hash_locks
+ hash
);
702 static bool is_full_stripe_write(struct stripe_head
*sh
)
704 BUG_ON(sh
->overwrite_disks
> (sh
->disks
- sh
->raid_conf
->max_degraded
));
705 return sh
->overwrite_disks
== (sh
->disks
- sh
->raid_conf
->max_degraded
);
708 static void lock_two_stripes(struct stripe_head
*sh1
, struct stripe_head
*sh2
)
712 spin_lock(&sh2
->stripe_lock
);
713 spin_lock_nested(&sh1
->stripe_lock
, 1);
715 spin_lock(&sh1
->stripe_lock
);
716 spin_lock_nested(&sh2
->stripe_lock
, 1);
720 static void unlock_two_stripes(struct stripe_head
*sh1
, struct stripe_head
*sh2
)
722 spin_unlock(&sh1
->stripe_lock
);
723 spin_unlock(&sh2
->stripe_lock
);
727 /* Only freshly new full stripe normal write stripe can be added to a batch list */
728 static bool stripe_can_batch(struct stripe_head
*sh
)
730 struct r5conf
*conf
= sh
->raid_conf
;
734 return test_bit(STRIPE_BATCH_READY
, &sh
->state
) &&
735 !test_bit(STRIPE_BITMAP_PENDING
, &sh
->state
) &&
736 is_full_stripe_write(sh
);
739 /* we only do back search */
740 static void stripe_add_to_batch_list(struct r5conf
*conf
, struct stripe_head
*sh
)
742 struct stripe_head
*head
;
743 sector_t head_sector
, tmp_sec
;
746 int inc_empty_inactive_list_flag
;
748 /* Don't cross chunks, so stripe pd_idx/qd_idx is the same */
749 tmp_sec
= sh
->sector
;
750 if (!sector_div(tmp_sec
, conf
->chunk_sectors
))
752 head_sector
= sh
->sector
- STRIPE_SECTORS
;
754 hash
= stripe_hash_locks_hash(head_sector
);
755 spin_lock_irq(conf
->hash_locks
+ hash
);
756 head
= __find_stripe(conf
, head_sector
, conf
->generation
);
757 if (head
&& !atomic_inc_not_zero(&head
->count
)) {
758 spin_lock(&conf
->device_lock
);
759 if (!atomic_read(&head
->count
)) {
760 if (!test_bit(STRIPE_HANDLE
, &head
->state
))
761 atomic_inc(&conf
->active_stripes
);
762 BUG_ON(list_empty(&head
->lru
) &&
763 !test_bit(STRIPE_EXPANDING
, &head
->state
));
764 inc_empty_inactive_list_flag
= 0;
765 if (!list_empty(conf
->inactive_list
+ hash
))
766 inc_empty_inactive_list_flag
= 1;
767 list_del_init(&head
->lru
);
768 if (list_empty(conf
->inactive_list
+ hash
) && inc_empty_inactive_list_flag
)
769 atomic_inc(&conf
->empty_inactive_list_nr
);
771 head
->group
->stripes_cnt
--;
775 atomic_inc(&head
->count
);
776 spin_unlock(&conf
->device_lock
);
778 spin_unlock_irq(conf
->hash_locks
+ hash
);
782 if (!stripe_can_batch(head
))
785 lock_two_stripes(head
, sh
);
786 /* clear_batch_ready clear the flag */
787 if (!stripe_can_batch(head
) || !stripe_can_batch(sh
))
794 while (dd_idx
== sh
->pd_idx
|| dd_idx
== sh
->qd_idx
)
796 if (head
->dev
[dd_idx
].towrite
->bi_opf
!= sh
->dev
[dd_idx
].towrite
->bi_opf
||
797 bio_op(head
->dev
[dd_idx
].towrite
) != bio_op(sh
->dev
[dd_idx
].towrite
))
800 if (head
->batch_head
) {
801 spin_lock(&head
->batch_head
->batch_lock
);
802 /* This batch list is already running */
803 if (!stripe_can_batch(head
)) {
804 spin_unlock(&head
->batch_head
->batch_lock
);
809 * at this point, head's BATCH_READY could be cleared, but we
810 * can still add the stripe to batch list
812 list_add(&sh
->batch_list
, &head
->batch_list
);
813 spin_unlock(&head
->batch_head
->batch_lock
);
815 sh
->batch_head
= head
->batch_head
;
817 head
->batch_head
= head
;
818 sh
->batch_head
= head
->batch_head
;
819 spin_lock(&head
->batch_lock
);
820 list_add_tail(&sh
->batch_list
, &head
->batch_list
);
821 spin_unlock(&head
->batch_lock
);
824 if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE
, &sh
->state
))
825 if (atomic_dec_return(&conf
->preread_active_stripes
)
827 md_wakeup_thread(conf
->mddev
->thread
);
829 if (test_and_clear_bit(STRIPE_BIT_DELAY
, &sh
->state
)) {
830 int seq
= sh
->bm_seq
;
831 if (test_bit(STRIPE_BIT_DELAY
, &sh
->batch_head
->state
) &&
832 sh
->batch_head
->bm_seq
> seq
)
833 seq
= sh
->batch_head
->bm_seq
;
834 set_bit(STRIPE_BIT_DELAY
, &sh
->batch_head
->state
);
835 sh
->batch_head
->bm_seq
= seq
;
838 atomic_inc(&sh
->count
);
840 unlock_two_stripes(head
, sh
);
842 raid5_release_stripe(head
);
845 /* Determine if 'data_offset' or 'new_data_offset' should be used
846 * in this stripe_head.
848 static int use_new_offset(struct r5conf
*conf
, struct stripe_head
*sh
)
850 sector_t progress
= conf
->reshape_progress
;
851 /* Need a memory barrier to make sure we see the value
852 * of conf->generation, or ->data_offset that was set before
853 * reshape_progress was updated.
856 if (progress
== MaxSector
)
858 if (sh
->generation
== conf
->generation
- 1)
860 /* We are in a reshape, and this is a new-generation stripe,
861 * so use new_data_offset.
866 static void flush_deferred_bios(struct r5conf
*conf
)
871 if (!conf
->batch_bio_dispatch
|| !conf
->group_cnt
)
875 spin_lock(&conf
->pending_bios_lock
);
876 bio_list_merge(&tmp
, &conf
->pending_bios
);
877 bio_list_init(&conf
->pending_bios
);
878 spin_unlock(&conf
->pending_bios_lock
);
880 while ((bio
= bio_list_pop(&tmp
)))
881 generic_make_request(bio
);
884 static void defer_bio_issue(struct r5conf
*conf
, struct bio
*bio
)
887 * change group_cnt will drain all bios, so this is safe
889 * A read generally means a read-modify-write, which usually means a
890 * randwrite, so we don't delay it
892 if (!conf
->batch_bio_dispatch
|| !conf
->group_cnt
||
893 bio_op(bio
) == REQ_OP_READ
) {
894 generic_make_request(bio
);
897 spin_lock(&conf
->pending_bios_lock
);
898 bio_list_add(&conf
->pending_bios
, bio
);
899 spin_unlock(&conf
->pending_bios_lock
);
900 md_wakeup_thread(conf
->mddev
->thread
);
904 raid5_end_read_request(struct bio
*bi
);
906 raid5_end_write_request(struct bio
*bi
);
908 static void ops_run_io(struct stripe_head
*sh
, struct stripe_head_state
*s
)
910 struct r5conf
*conf
= sh
->raid_conf
;
911 int i
, disks
= sh
->disks
;
912 struct stripe_head
*head_sh
= sh
;
916 if (!test_bit(STRIPE_R5C_CACHING
, &sh
->state
)) {
917 /* writing out phase */
918 if (s
->waiting_extra_page
)
920 if (r5l_write_stripe(conf
->log
, sh
) == 0)
922 } else { /* caching phase */
923 if (test_bit(STRIPE_LOG_TRAPPED
, &sh
->state
)) {
924 r5c_cache_data(conf
->log
, sh
, s
);
929 for (i
= disks
; i
--; ) {
930 int op
, op_flags
= 0;
931 int replace_only
= 0;
932 struct bio
*bi
, *rbi
;
933 struct md_rdev
*rdev
, *rrdev
= NULL
;
936 if (test_and_clear_bit(R5_Wantwrite
, &sh
->dev
[i
].flags
)) {
938 if (test_and_clear_bit(R5_WantFUA
, &sh
->dev
[i
].flags
))
940 if (test_bit(R5_Discard
, &sh
->dev
[i
].flags
))
942 } else if (test_and_clear_bit(R5_Wantread
, &sh
->dev
[i
].flags
))
944 else if (test_and_clear_bit(R5_WantReplace
,
945 &sh
->dev
[i
].flags
)) {
950 if (test_and_clear_bit(R5_SyncIO
, &sh
->dev
[i
].flags
))
951 op_flags
|= REQ_SYNC
;
954 bi
= &sh
->dev
[i
].req
;
955 rbi
= &sh
->dev
[i
].rreq
; /* For writing to replacement */
958 rrdev
= rcu_dereference(conf
->disks
[i
].replacement
);
959 smp_mb(); /* Ensure that if rrdev is NULL, rdev won't be */
960 rdev
= rcu_dereference(conf
->disks
[i
].rdev
);
965 if (op_is_write(op
)) {
969 /* We raced and saw duplicates */
972 if (test_bit(R5_ReadRepl
, &head_sh
->dev
[i
].flags
) && rrdev
)
977 if (rdev
&& test_bit(Faulty
, &rdev
->flags
))
980 atomic_inc(&rdev
->nr_pending
);
981 if (rrdev
&& test_bit(Faulty
, &rrdev
->flags
))
984 atomic_inc(&rrdev
->nr_pending
);
987 /* We have already checked bad blocks for reads. Now
988 * need to check for writes. We never accept write errors
989 * on the replacement, so we don't to check rrdev.
991 while (op_is_write(op
) && rdev
&&
992 test_bit(WriteErrorSeen
, &rdev
->flags
)) {
995 int bad
= is_badblock(rdev
, sh
->sector
, STRIPE_SECTORS
,
996 &first_bad
, &bad_sectors
);
1001 set_bit(BlockedBadBlocks
, &rdev
->flags
);
1002 if (!conf
->mddev
->external
&&
1003 conf
->mddev
->sb_flags
) {
1004 /* It is very unlikely, but we might
1005 * still need to write out the
1006 * bad block log - better give it
1008 md_check_recovery(conf
->mddev
);
1011 * Because md_wait_for_blocked_rdev
1012 * will dec nr_pending, we must
1013 * increment it first.
1015 atomic_inc(&rdev
->nr_pending
);
1016 md_wait_for_blocked_rdev(rdev
, conf
->mddev
);
1018 /* Acknowledged bad block - skip the write */
1019 rdev_dec_pending(rdev
, conf
->mddev
);
1025 if (s
->syncing
|| s
->expanding
|| s
->expanded
1027 md_sync_acct(rdev
->bdev
, STRIPE_SECTORS
);
1029 set_bit(STRIPE_IO_STARTED
, &sh
->state
);
1031 bi
->bi_bdev
= rdev
->bdev
;
1032 bio_set_op_attrs(bi
, op
, op_flags
);
1033 bi
->bi_end_io
= op_is_write(op
)
1034 ? raid5_end_write_request
1035 : raid5_end_read_request
;
1036 bi
->bi_private
= sh
;
1038 pr_debug("%s: for %llu schedule op %d on disc %d\n",
1039 __func__
, (unsigned long long)sh
->sector
,
1041 atomic_inc(&sh
->count
);
1043 atomic_inc(&head_sh
->count
);
1044 if (use_new_offset(conf
, sh
))
1045 bi
->bi_iter
.bi_sector
= (sh
->sector
1046 + rdev
->new_data_offset
);
1048 bi
->bi_iter
.bi_sector
= (sh
->sector
1049 + rdev
->data_offset
);
1050 if (test_bit(R5_ReadNoMerge
, &head_sh
->dev
[i
].flags
))
1051 bi
->bi_opf
|= REQ_NOMERGE
;
1053 if (test_bit(R5_SkipCopy
, &sh
->dev
[i
].flags
))
1054 WARN_ON(test_bit(R5_UPTODATE
, &sh
->dev
[i
].flags
));
1056 if (!op_is_write(op
) &&
1057 test_bit(R5_InJournal
, &sh
->dev
[i
].flags
))
1059 * issuing read for a page in journal, this
1060 * must be preparing for prexor in rmw; read
1061 * the data into orig_page
1063 sh
->dev
[i
].vec
.bv_page
= sh
->dev
[i
].orig_page
;
1065 sh
->dev
[i
].vec
.bv_page
= sh
->dev
[i
].page
;
1067 bi
->bi_io_vec
[0].bv_len
= STRIPE_SIZE
;
1068 bi
->bi_io_vec
[0].bv_offset
= 0;
1069 bi
->bi_iter
.bi_size
= STRIPE_SIZE
;
1071 * If this is discard request, set bi_vcnt 0. We don't
1072 * want to confuse SCSI because SCSI will replace payload
1074 if (op
== REQ_OP_DISCARD
)
1077 set_bit(R5_DOUBLE_LOCKED
, &sh
->dev
[i
].flags
);
1079 if (conf
->mddev
->gendisk
)
1080 trace_block_bio_remap(bdev_get_queue(bi
->bi_bdev
),
1081 bi
, disk_devt(conf
->mddev
->gendisk
),
1083 defer_bio_issue(conf
, bi
);
1086 if (s
->syncing
|| s
->expanding
|| s
->expanded
1088 md_sync_acct(rrdev
->bdev
, STRIPE_SECTORS
);
1090 set_bit(STRIPE_IO_STARTED
, &sh
->state
);
1092 rbi
->bi_bdev
= rrdev
->bdev
;
1093 bio_set_op_attrs(rbi
, op
, op_flags
);
1094 BUG_ON(!op_is_write(op
));
1095 rbi
->bi_end_io
= raid5_end_write_request
;
1096 rbi
->bi_private
= sh
;
1098 pr_debug("%s: for %llu schedule op %d on "
1099 "replacement disc %d\n",
1100 __func__
, (unsigned long long)sh
->sector
,
1102 atomic_inc(&sh
->count
);
1104 atomic_inc(&head_sh
->count
);
1105 if (use_new_offset(conf
, sh
))
1106 rbi
->bi_iter
.bi_sector
= (sh
->sector
1107 + rrdev
->new_data_offset
);
1109 rbi
->bi_iter
.bi_sector
= (sh
->sector
1110 + rrdev
->data_offset
);
1111 if (test_bit(R5_SkipCopy
, &sh
->dev
[i
].flags
))
1112 WARN_ON(test_bit(R5_UPTODATE
, &sh
->dev
[i
].flags
));
1113 sh
->dev
[i
].rvec
.bv_page
= sh
->dev
[i
].page
;
1115 rbi
->bi_io_vec
[0].bv_len
= STRIPE_SIZE
;
1116 rbi
->bi_io_vec
[0].bv_offset
= 0;
1117 rbi
->bi_iter
.bi_size
= STRIPE_SIZE
;
1119 * If this is discard request, set bi_vcnt 0. We don't
1120 * want to confuse SCSI because SCSI will replace payload
1122 if (op
== REQ_OP_DISCARD
)
1124 if (conf
->mddev
->gendisk
)
1125 trace_block_bio_remap(bdev_get_queue(rbi
->bi_bdev
),
1126 rbi
, disk_devt(conf
->mddev
->gendisk
),
1128 defer_bio_issue(conf
, rbi
);
1130 if (!rdev
&& !rrdev
) {
1131 if (op_is_write(op
))
1132 set_bit(STRIPE_DEGRADED
, &sh
->state
);
1133 pr_debug("skip op %d on disc %d for sector %llu\n",
1134 bi
->bi_opf
, i
, (unsigned long long)sh
->sector
);
1135 clear_bit(R5_LOCKED
, &sh
->dev
[i
].flags
);
1136 set_bit(STRIPE_HANDLE
, &sh
->state
);
1139 if (!head_sh
->batch_head
)
1141 sh
= list_first_entry(&sh
->batch_list
, struct stripe_head
,
1148 static struct dma_async_tx_descriptor
*
1149 async_copy_data(int frombio
, struct bio
*bio
, struct page
**page
,
1150 sector_t sector
, struct dma_async_tx_descriptor
*tx
,
1151 struct stripe_head
*sh
, int no_skipcopy
)
1154 struct bvec_iter iter
;
1155 struct page
*bio_page
;
1157 struct async_submit_ctl submit
;
1158 enum async_tx_flags flags
= 0;
1160 if (bio
->bi_iter
.bi_sector
>= sector
)
1161 page_offset
= (signed)(bio
->bi_iter
.bi_sector
- sector
) * 512;
1163 page_offset
= (signed)(sector
- bio
->bi_iter
.bi_sector
) * -512;
1166 flags
|= ASYNC_TX_FENCE
;
1167 init_async_submit(&submit
, flags
, tx
, NULL
, NULL
, NULL
);
1169 bio_for_each_segment(bvl
, bio
, iter
) {
1170 int len
= bvl
.bv_len
;
1174 if (page_offset
< 0) {
1175 b_offset
= -page_offset
;
1176 page_offset
+= b_offset
;
1180 if (len
> 0 && page_offset
+ len
> STRIPE_SIZE
)
1181 clen
= STRIPE_SIZE
- page_offset
;
1186 b_offset
+= bvl
.bv_offset
;
1187 bio_page
= bvl
.bv_page
;
1189 if (sh
->raid_conf
->skip_copy
&&
1190 b_offset
== 0 && page_offset
== 0 &&
1191 clen
== STRIPE_SIZE
&&
1195 tx
= async_memcpy(*page
, bio_page
, page_offset
,
1196 b_offset
, clen
, &submit
);
1198 tx
= async_memcpy(bio_page
, *page
, b_offset
,
1199 page_offset
, clen
, &submit
);
1201 /* chain the operations */
1202 submit
.depend_tx
= tx
;
1204 if (clen
< len
) /* hit end of page */
1212 static void ops_complete_biofill(void *stripe_head_ref
)
1214 struct stripe_head
*sh
= stripe_head_ref
;
1215 struct bio_list return_bi
= BIO_EMPTY_LIST
;
1218 pr_debug("%s: stripe %llu\n", __func__
,
1219 (unsigned long long)sh
->sector
);
1221 /* clear completed biofills */
1222 for (i
= sh
->disks
; i
--; ) {
1223 struct r5dev
*dev
= &sh
->dev
[i
];
1225 /* acknowledge completion of a biofill operation */
1226 /* and check if we need to reply to a read request,
1227 * new R5_Wantfill requests are held off until
1228 * !STRIPE_BIOFILL_RUN
1230 if (test_and_clear_bit(R5_Wantfill
, &dev
->flags
)) {
1231 struct bio
*rbi
, *rbi2
;
1236 while (rbi
&& rbi
->bi_iter
.bi_sector
<
1237 dev
->sector
+ STRIPE_SECTORS
) {
1238 rbi2
= r5_next_bio(rbi
, dev
->sector
);
1239 if (!raid5_dec_bi_active_stripes(rbi
))
1240 bio_list_add(&return_bi
, rbi
);
1245 clear_bit(STRIPE_BIOFILL_RUN
, &sh
->state
);
1247 return_io(&return_bi
);
1249 set_bit(STRIPE_HANDLE
, &sh
->state
);
1250 raid5_release_stripe(sh
);
1253 static void ops_run_biofill(struct stripe_head
*sh
)
1255 struct dma_async_tx_descriptor
*tx
= NULL
;
1256 struct async_submit_ctl submit
;
1259 BUG_ON(sh
->batch_head
);
1260 pr_debug("%s: stripe %llu\n", __func__
,
1261 (unsigned long long)sh
->sector
);
1263 for (i
= sh
->disks
; i
--; ) {
1264 struct r5dev
*dev
= &sh
->dev
[i
];
1265 if (test_bit(R5_Wantfill
, &dev
->flags
)) {
1267 spin_lock_irq(&sh
->stripe_lock
);
1268 dev
->read
= rbi
= dev
->toread
;
1270 spin_unlock_irq(&sh
->stripe_lock
);
1271 while (rbi
&& rbi
->bi_iter
.bi_sector
<
1272 dev
->sector
+ STRIPE_SECTORS
) {
1273 tx
= async_copy_data(0, rbi
, &dev
->page
,
1274 dev
->sector
, tx
, sh
, 0);
1275 rbi
= r5_next_bio(rbi
, dev
->sector
);
1280 atomic_inc(&sh
->count
);
1281 init_async_submit(&submit
, ASYNC_TX_ACK
, tx
, ops_complete_biofill
, sh
, NULL
);
1282 async_trigger_callback(&submit
);
1285 static void mark_target_uptodate(struct stripe_head
*sh
, int target
)
1292 tgt
= &sh
->dev
[target
];
1293 set_bit(R5_UPTODATE
, &tgt
->flags
);
1294 BUG_ON(!test_bit(R5_Wantcompute
, &tgt
->flags
));
1295 clear_bit(R5_Wantcompute
, &tgt
->flags
);
1298 static void ops_complete_compute(void *stripe_head_ref
)
1300 struct stripe_head
*sh
= stripe_head_ref
;
1302 pr_debug("%s: stripe %llu\n", __func__
,
1303 (unsigned long long)sh
->sector
);
1305 /* mark the computed target(s) as uptodate */
1306 mark_target_uptodate(sh
, sh
->ops
.target
);
1307 mark_target_uptodate(sh
, sh
->ops
.target2
);
1309 clear_bit(STRIPE_COMPUTE_RUN
, &sh
->state
);
1310 if (sh
->check_state
== check_state_compute_run
)
1311 sh
->check_state
= check_state_compute_result
;
1312 set_bit(STRIPE_HANDLE
, &sh
->state
);
1313 raid5_release_stripe(sh
);
1316 /* return a pointer to the address conversion region of the scribble buffer */
1317 static addr_conv_t
*to_addr_conv(struct stripe_head
*sh
,
1318 struct raid5_percpu
*percpu
, int i
)
1322 addr
= flex_array_get(percpu
->scribble
, i
);
1323 return addr
+ sizeof(struct page
*) * (sh
->disks
+ 2);
1326 /* return a pointer to the address conversion region of the scribble buffer */
1327 static struct page
**to_addr_page(struct raid5_percpu
*percpu
, int i
)
1331 addr
= flex_array_get(percpu
->scribble
, i
);
1335 static struct dma_async_tx_descriptor
*
1336 ops_run_compute5(struct stripe_head
*sh
, struct raid5_percpu
*percpu
)
1338 int disks
= sh
->disks
;
1339 struct page
**xor_srcs
= to_addr_page(percpu
, 0);
1340 int target
= sh
->ops
.target
;
1341 struct r5dev
*tgt
= &sh
->dev
[target
];
1342 struct page
*xor_dest
= tgt
->page
;
1344 struct dma_async_tx_descriptor
*tx
;
1345 struct async_submit_ctl submit
;
1348 BUG_ON(sh
->batch_head
);
1350 pr_debug("%s: stripe %llu block: %d\n",
1351 __func__
, (unsigned long long)sh
->sector
, target
);
1352 BUG_ON(!test_bit(R5_Wantcompute
, &tgt
->flags
));
1354 for (i
= disks
; i
--; )
1356 xor_srcs
[count
++] = sh
->dev
[i
].page
;
1358 atomic_inc(&sh
->count
);
1360 init_async_submit(&submit
, ASYNC_TX_FENCE
|ASYNC_TX_XOR_ZERO_DST
, NULL
,
1361 ops_complete_compute
, sh
, to_addr_conv(sh
, percpu
, 0));
1362 if (unlikely(count
== 1))
1363 tx
= async_memcpy(xor_dest
, xor_srcs
[0], 0, 0, STRIPE_SIZE
, &submit
);
1365 tx
= async_xor(xor_dest
, xor_srcs
, 0, count
, STRIPE_SIZE
, &submit
);
1370 /* set_syndrome_sources - populate source buffers for gen_syndrome
1371 * @srcs - (struct page *) array of size sh->disks
1372 * @sh - stripe_head to parse
1374 * Populates srcs in proper layout order for the stripe and returns the
1375 * 'count' of sources to be used in a call to async_gen_syndrome. The P
1376 * destination buffer is recorded in srcs[count] and the Q destination
1377 * is recorded in srcs[count+1]].
1379 static int set_syndrome_sources(struct page
**srcs
,
1380 struct stripe_head
*sh
,
1383 int disks
= sh
->disks
;
1384 int syndrome_disks
= sh
->ddf_layout
? disks
: (disks
- 2);
1385 int d0_idx
= raid6_d0(sh
);
1389 for (i
= 0; i
< disks
; i
++)
1395 int slot
= raid6_idx_to_slot(i
, sh
, &count
, syndrome_disks
);
1396 struct r5dev
*dev
= &sh
->dev
[i
];
1398 if (i
== sh
->qd_idx
|| i
== sh
->pd_idx
||
1399 (srctype
== SYNDROME_SRC_ALL
) ||
1400 (srctype
== SYNDROME_SRC_WANT_DRAIN
&&
1401 (test_bit(R5_Wantdrain
, &dev
->flags
) ||
1402 test_bit(R5_InJournal
, &dev
->flags
))) ||
1403 (srctype
== SYNDROME_SRC_WRITTEN
&&
1405 test_bit(R5_InJournal
, &dev
->flags
)))) {
1406 if (test_bit(R5_InJournal
, &dev
->flags
))
1407 srcs
[slot
] = sh
->dev
[i
].orig_page
;
1409 srcs
[slot
] = sh
->dev
[i
].page
;
1411 i
= raid6_next_disk(i
, disks
);
1412 } while (i
!= d0_idx
);
1414 return syndrome_disks
;
1417 static struct dma_async_tx_descriptor
*
1418 ops_run_compute6_1(struct stripe_head
*sh
, struct raid5_percpu
*percpu
)
1420 int disks
= sh
->disks
;
1421 struct page
**blocks
= to_addr_page(percpu
, 0);
1423 int qd_idx
= sh
->qd_idx
;
1424 struct dma_async_tx_descriptor
*tx
;
1425 struct async_submit_ctl submit
;
1431 BUG_ON(sh
->batch_head
);
1432 if (sh
->ops
.target
< 0)
1433 target
= sh
->ops
.target2
;
1434 else if (sh
->ops
.target2
< 0)
1435 target
= sh
->ops
.target
;
1437 /* we should only have one valid target */
1440 pr_debug("%s: stripe %llu block: %d\n",
1441 __func__
, (unsigned long long)sh
->sector
, target
);
1443 tgt
= &sh
->dev
[target
];
1444 BUG_ON(!test_bit(R5_Wantcompute
, &tgt
->flags
));
1447 atomic_inc(&sh
->count
);
1449 if (target
== qd_idx
) {
1450 count
= set_syndrome_sources(blocks
, sh
, SYNDROME_SRC_ALL
);
1451 blocks
[count
] = NULL
; /* regenerating p is not necessary */
1452 BUG_ON(blocks
[count
+1] != dest
); /* q should already be set */
1453 init_async_submit(&submit
, ASYNC_TX_FENCE
, NULL
,
1454 ops_complete_compute
, sh
,
1455 to_addr_conv(sh
, percpu
, 0));
1456 tx
= async_gen_syndrome(blocks
, 0, count
+2, STRIPE_SIZE
, &submit
);
1458 /* Compute any data- or p-drive using XOR */
1460 for (i
= disks
; i
-- ; ) {
1461 if (i
== target
|| i
== qd_idx
)
1463 blocks
[count
++] = sh
->dev
[i
].page
;
1466 init_async_submit(&submit
, ASYNC_TX_FENCE
|ASYNC_TX_XOR_ZERO_DST
,
1467 NULL
, ops_complete_compute
, sh
,
1468 to_addr_conv(sh
, percpu
, 0));
1469 tx
= async_xor(dest
, blocks
, 0, count
, STRIPE_SIZE
, &submit
);
1475 static struct dma_async_tx_descriptor
*
1476 ops_run_compute6_2(struct stripe_head
*sh
, struct raid5_percpu
*percpu
)
1478 int i
, count
, disks
= sh
->disks
;
1479 int syndrome_disks
= sh
->ddf_layout
? disks
: disks
-2;
1480 int d0_idx
= raid6_d0(sh
);
1481 int faila
= -1, failb
= -1;
1482 int target
= sh
->ops
.target
;
1483 int target2
= sh
->ops
.target2
;
1484 struct r5dev
*tgt
= &sh
->dev
[target
];
1485 struct r5dev
*tgt2
= &sh
->dev
[target2
];
1486 struct dma_async_tx_descriptor
*tx
;
1487 struct page
**blocks
= to_addr_page(percpu
, 0);
1488 struct async_submit_ctl submit
;
1490 BUG_ON(sh
->batch_head
);
1491 pr_debug("%s: stripe %llu block1: %d block2: %d\n",
1492 __func__
, (unsigned long long)sh
->sector
, target
, target2
);
1493 BUG_ON(target
< 0 || target2
< 0);
1494 BUG_ON(!test_bit(R5_Wantcompute
, &tgt
->flags
));
1495 BUG_ON(!test_bit(R5_Wantcompute
, &tgt2
->flags
));
1497 /* we need to open-code set_syndrome_sources to handle the
1498 * slot number conversion for 'faila' and 'failb'
1500 for (i
= 0; i
< disks
; i
++)
1505 int slot
= raid6_idx_to_slot(i
, sh
, &count
, syndrome_disks
);
1507 blocks
[slot
] = sh
->dev
[i
].page
;
1513 i
= raid6_next_disk(i
, disks
);
1514 } while (i
!= d0_idx
);
1516 BUG_ON(faila
== failb
);
1519 pr_debug("%s: stripe: %llu faila: %d failb: %d\n",
1520 __func__
, (unsigned long long)sh
->sector
, faila
, failb
);
1522 atomic_inc(&sh
->count
);
1524 if (failb
== syndrome_disks
+1) {
1525 /* Q disk is one of the missing disks */
1526 if (faila
== syndrome_disks
) {
1527 /* Missing P+Q, just recompute */
1528 init_async_submit(&submit
, ASYNC_TX_FENCE
, NULL
,
1529 ops_complete_compute
, sh
,
1530 to_addr_conv(sh
, percpu
, 0));
1531 return async_gen_syndrome(blocks
, 0, syndrome_disks
+2,
1532 STRIPE_SIZE
, &submit
);
1536 int qd_idx
= sh
->qd_idx
;
1538 /* Missing D+Q: recompute D from P, then recompute Q */
1539 if (target
== qd_idx
)
1540 data_target
= target2
;
1542 data_target
= target
;
1545 for (i
= disks
; i
-- ; ) {
1546 if (i
== data_target
|| i
== qd_idx
)
1548 blocks
[count
++] = sh
->dev
[i
].page
;
1550 dest
= sh
->dev
[data_target
].page
;
1551 init_async_submit(&submit
,
1552 ASYNC_TX_FENCE
|ASYNC_TX_XOR_ZERO_DST
,
1554 to_addr_conv(sh
, percpu
, 0));
1555 tx
= async_xor(dest
, blocks
, 0, count
, STRIPE_SIZE
,
1558 count
= set_syndrome_sources(blocks
, sh
, SYNDROME_SRC_ALL
);
1559 init_async_submit(&submit
, ASYNC_TX_FENCE
, tx
,
1560 ops_complete_compute
, sh
,
1561 to_addr_conv(sh
, percpu
, 0));
1562 return async_gen_syndrome(blocks
, 0, count
+2,
1563 STRIPE_SIZE
, &submit
);
1566 init_async_submit(&submit
, ASYNC_TX_FENCE
, NULL
,
1567 ops_complete_compute
, sh
,
1568 to_addr_conv(sh
, percpu
, 0));
1569 if (failb
== syndrome_disks
) {
1570 /* We're missing D+P. */
1571 return async_raid6_datap_recov(syndrome_disks
+2,
1575 /* We're missing D+D. */
1576 return async_raid6_2data_recov(syndrome_disks
+2,
1577 STRIPE_SIZE
, faila
, failb
,
1583 static void ops_complete_prexor(void *stripe_head_ref
)
1585 struct stripe_head
*sh
= stripe_head_ref
;
1587 pr_debug("%s: stripe %llu\n", __func__
,
1588 (unsigned long long)sh
->sector
);
1590 if (r5c_is_writeback(sh
->raid_conf
->log
))
1592 * raid5-cache write back uses orig_page during prexor.
1593 * After prexor, it is time to free orig_page
1595 r5c_release_extra_page(sh
);
1598 static struct dma_async_tx_descriptor
*
1599 ops_run_prexor5(struct stripe_head
*sh
, struct raid5_percpu
*percpu
,
1600 struct dma_async_tx_descriptor
*tx
)
1602 int disks
= sh
->disks
;
1603 struct page
**xor_srcs
= to_addr_page(percpu
, 0);
1604 int count
= 0, pd_idx
= sh
->pd_idx
, i
;
1605 struct async_submit_ctl submit
;
1607 /* existing parity data subtracted */
1608 struct page
*xor_dest
= xor_srcs
[count
++] = sh
->dev
[pd_idx
].page
;
1610 BUG_ON(sh
->batch_head
);
1611 pr_debug("%s: stripe %llu\n", __func__
,
1612 (unsigned long long)sh
->sector
);
1614 for (i
= disks
; i
--; ) {
1615 struct r5dev
*dev
= &sh
->dev
[i
];
1616 /* Only process blocks that are known to be uptodate */
1617 if (test_bit(R5_InJournal
, &dev
->flags
))
1618 xor_srcs
[count
++] = dev
->orig_page
;
1619 else if (test_bit(R5_Wantdrain
, &dev
->flags
))
1620 xor_srcs
[count
++] = dev
->page
;
1623 init_async_submit(&submit
, ASYNC_TX_FENCE
|ASYNC_TX_XOR_DROP_DST
, tx
,
1624 ops_complete_prexor
, sh
, to_addr_conv(sh
, percpu
, 0));
1625 tx
= async_xor(xor_dest
, xor_srcs
, 0, count
, STRIPE_SIZE
, &submit
);
1630 static struct dma_async_tx_descriptor
*
1631 ops_run_prexor6(struct stripe_head
*sh
, struct raid5_percpu
*percpu
,
1632 struct dma_async_tx_descriptor
*tx
)
1634 struct page
**blocks
= to_addr_page(percpu
, 0);
1636 struct async_submit_ctl submit
;
1638 pr_debug("%s: stripe %llu\n", __func__
,
1639 (unsigned long long)sh
->sector
);
1641 count
= set_syndrome_sources(blocks
, sh
, SYNDROME_SRC_WANT_DRAIN
);
1643 init_async_submit(&submit
, ASYNC_TX_FENCE
|ASYNC_TX_PQ_XOR_DST
, tx
,
1644 ops_complete_prexor
, sh
, to_addr_conv(sh
, percpu
, 0));
1645 tx
= async_gen_syndrome(blocks
, 0, count
+2, STRIPE_SIZE
, &submit
);
1650 static struct dma_async_tx_descriptor
*
1651 ops_run_biodrain(struct stripe_head
*sh
, struct dma_async_tx_descriptor
*tx
)
1653 struct r5conf
*conf
= sh
->raid_conf
;
1654 int disks
= sh
->disks
;
1656 struct stripe_head
*head_sh
= sh
;
1658 pr_debug("%s: stripe %llu\n", __func__
,
1659 (unsigned long long)sh
->sector
);
1661 for (i
= disks
; i
--; ) {
1666 if (test_and_clear_bit(R5_Wantdrain
, &head_sh
->dev
[i
].flags
)) {
1672 * clear R5_InJournal, so when rewriting a page in
1673 * journal, it is not skipped by r5l_log_stripe()
1675 clear_bit(R5_InJournal
, &dev
->flags
);
1676 spin_lock_irq(&sh
->stripe_lock
);
1677 chosen
= dev
->towrite
;
1678 dev
->towrite
= NULL
;
1679 sh
->overwrite_disks
= 0;
1680 BUG_ON(dev
->written
);
1681 wbi
= dev
->written
= chosen
;
1682 spin_unlock_irq(&sh
->stripe_lock
);
1683 WARN_ON(dev
->page
!= dev
->orig_page
);
1685 while (wbi
&& wbi
->bi_iter
.bi_sector
<
1686 dev
->sector
+ STRIPE_SECTORS
) {
1687 if (wbi
->bi_opf
& REQ_FUA
)
1688 set_bit(R5_WantFUA
, &dev
->flags
);
1689 if (wbi
->bi_opf
& REQ_SYNC
)
1690 set_bit(R5_SyncIO
, &dev
->flags
);
1691 if (bio_op(wbi
) == REQ_OP_DISCARD
)
1692 set_bit(R5_Discard
, &dev
->flags
);
1694 tx
= async_copy_data(1, wbi
, &dev
->page
,
1695 dev
->sector
, tx
, sh
,
1696 r5c_is_writeback(conf
->log
));
1697 if (dev
->page
!= dev
->orig_page
&&
1698 !r5c_is_writeback(conf
->log
)) {
1699 set_bit(R5_SkipCopy
, &dev
->flags
);
1700 clear_bit(R5_UPTODATE
, &dev
->flags
);
1701 clear_bit(R5_OVERWRITE
, &dev
->flags
);
1704 wbi
= r5_next_bio(wbi
, dev
->sector
);
1707 if (head_sh
->batch_head
) {
1708 sh
= list_first_entry(&sh
->batch_list
,
1721 static void ops_complete_reconstruct(void *stripe_head_ref
)
1723 struct stripe_head
*sh
= stripe_head_ref
;
1724 int disks
= sh
->disks
;
1725 int pd_idx
= sh
->pd_idx
;
1726 int qd_idx
= sh
->qd_idx
;
1728 bool fua
= false, sync
= false, discard
= false;
1730 pr_debug("%s: stripe %llu\n", __func__
,
1731 (unsigned long long)sh
->sector
);
1733 for (i
= disks
; i
--; ) {
1734 fua
|= test_bit(R5_WantFUA
, &sh
->dev
[i
].flags
);
1735 sync
|= test_bit(R5_SyncIO
, &sh
->dev
[i
].flags
);
1736 discard
|= test_bit(R5_Discard
, &sh
->dev
[i
].flags
);
1739 for (i
= disks
; i
--; ) {
1740 struct r5dev
*dev
= &sh
->dev
[i
];
1742 if (dev
->written
|| i
== pd_idx
|| i
== qd_idx
) {
1743 if (!discard
&& !test_bit(R5_SkipCopy
, &dev
->flags
))
1744 set_bit(R5_UPTODATE
, &dev
->flags
);
1746 set_bit(R5_WantFUA
, &dev
->flags
);
1748 set_bit(R5_SyncIO
, &dev
->flags
);
1752 if (sh
->reconstruct_state
== reconstruct_state_drain_run
)
1753 sh
->reconstruct_state
= reconstruct_state_drain_result
;
1754 else if (sh
->reconstruct_state
== reconstruct_state_prexor_drain_run
)
1755 sh
->reconstruct_state
= reconstruct_state_prexor_drain_result
;
1757 BUG_ON(sh
->reconstruct_state
!= reconstruct_state_run
);
1758 sh
->reconstruct_state
= reconstruct_state_result
;
1761 set_bit(STRIPE_HANDLE
, &sh
->state
);
1762 raid5_release_stripe(sh
);
1766 ops_run_reconstruct5(struct stripe_head
*sh
, struct raid5_percpu
*percpu
,
1767 struct dma_async_tx_descriptor
*tx
)
1769 int disks
= sh
->disks
;
1770 struct page
**xor_srcs
;
1771 struct async_submit_ctl submit
;
1772 int count
, pd_idx
= sh
->pd_idx
, i
;
1773 struct page
*xor_dest
;
1775 unsigned long flags
;
1777 struct stripe_head
*head_sh
= sh
;
1780 pr_debug("%s: stripe %llu\n", __func__
,
1781 (unsigned long long)sh
->sector
);
1783 for (i
= 0; i
< sh
->disks
; i
++) {
1786 if (!test_bit(R5_Discard
, &sh
->dev
[i
].flags
))
1789 if (i
>= sh
->disks
) {
1790 atomic_inc(&sh
->count
);
1791 set_bit(R5_Discard
, &sh
->dev
[pd_idx
].flags
);
1792 ops_complete_reconstruct(sh
);
1797 xor_srcs
= to_addr_page(percpu
, j
);
1798 /* check if prexor is active which means only process blocks
1799 * that are part of a read-modify-write (written)
1801 if (head_sh
->reconstruct_state
== reconstruct_state_prexor_drain_run
) {
1803 xor_dest
= xor_srcs
[count
++] = sh
->dev
[pd_idx
].page
;
1804 for (i
= disks
; i
--; ) {
1805 struct r5dev
*dev
= &sh
->dev
[i
];
1806 if (head_sh
->dev
[i
].written
||
1807 test_bit(R5_InJournal
, &head_sh
->dev
[i
].flags
))
1808 xor_srcs
[count
++] = dev
->page
;
1811 xor_dest
= sh
->dev
[pd_idx
].page
;
1812 for (i
= disks
; i
--; ) {
1813 struct r5dev
*dev
= &sh
->dev
[i
];
1815 xor_srcs
[count
++] = dev
->page
;
1819 /* 1/ if we prexor'd then the dest is reused as a source
1820 * 2/ if we did not prexor then we are redoing the parity
1821 * set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST
1822 * for the synchronous xor case
1824 last_stripe
= !head_sh
->batch_head
||
1825 list_first_entry(&sh
->batch_list
,
1826 struct stripe_head
, batch_list
) == head_sh
;
1828 flags
= ASYNC_TX_ACK
|
1829 (prexor
? ASYNC_TX_XOR_DROP_DST
: ASYNC_TX_XOR_ZERO_DST
);
1831 atomic_inc(&head_sh
->count
);
1832 init_async_submit(&submit
, flags
, tx
, ops_complete_reconstruct
, head_sh
,
1833 to_addr_conv(sh
, percpu
, j
));
1835 flags
= prexor
? ASYNC_TX_XOR_DROP_DST
: ASYNC_TX_XOR_ZERO_DST
;
1836 init_async_submit(&submit
, flags
, tx
, NULL
, NULL
,
1837 to_addr_conv(sh
, percpu
, j
));
1840 if (unlikely(count
== 1))
1841 tx
= async_memcpy(xor_dest
, xor_srcs
[0], 0, 0, STRIPE_SIZE
, &submit
);
1843 tx
= async_xor(xor_dest
, xor_srcs
, 0, count
, STRIPE_SIZE
, &submit
);
1846 sh
= list_first_entry(&sh
->batch_list
, struct stripe_head
,
1853 ops_run_reconstruct6(struct stripe_head
*sh
, struct raid5_percpu
*percpu
,
1854 struct dma_async_tx_descriptor
*tx
)
1856 struct async_submit_ctl submit
;
1857 struct page
**blocks
;
1858 int count
, i
, j
= 0;
1859 struct stripe_head
*head_sh
= sh
;
1862 unsigned long txflags
;
1864 pr_debug("%s: stripe %llu\n", __func__
, (unsigned long long)sh
->sector
);
1866 for (i
= 0; i
< sh
->disks
; i
++) {
1867 if (sh
->pd_idx
== i
|| sh
->qd_idx
== i
)
1869 if (!test_bit(R5_Discard
, &sh
->dev
[i
].flags
))
1872 if (i
>= sh
->disks
) {
1873 atomic_inc(&sh
->count
);
1874 set_bit(R5_Discard
, &sh
->dev
[sh
->pd_idx
].flags
);
1875 set_bit(R5_Discard
, &sh
->dev
[sh
->qd_idx
].flags
);
1876 ops_complete_reconstruct(sh
);
1881 blocks
= to_addr_page(percpu
, j
);
1883 if (sh
->reconstruct_state
== reconstruct_state_prexor_drain_run
) {
1884 synflags
= SYNDROME_SRC_WRITTEN
;
1885 txflags
= ASYNC_TX_ACK
| ASYNC_TX_PQ_XOR_DST
;
1887 synflags
= SYNDROME_SRC_ALL
;
1888 txflags
= ASYNC_TX_ACK
;
1891 count
= set_syndrome_sources(blocks
, sh
, synflags
);
1892 last_stripe
= !head_sh
->batch_head
||
1893 list_first_entry(&sh
->batch_list
,
1894 struct stripe_head
, batch_list
) == head_sh
;
1897 atomic_inc(&head_sh
->count
);
1898 init_async_submit(&submit
, txflags
, tx
, ops_complete_reconstruct
,
1899 head_sh
, to_addr_conv(sh
, percpu
, j
));
1901 init_async_submit(&submit
, 0, tx
, NULL
, NULL
,
1902 to_addr_conv(sh
, percpu
, j
));
1903 tx
= async_gen_syndrome(blocks
, 0, count
+2, STRIPE_SIZE
, &submit
);
1906 sh
= list_first_entry(&sh
->batch_list
, struct stripe_head
,
1912 static void ops_complete_check(void *stripe_head_ref
)
1914 struct stripe_head
*sh
= stripe_head_ref
;
1916 pr_debug("%s: stripe %llu\n", __func__
,
1917 (unsigned long long)sh
->sector
);
1919 sh
->check_state
= check_state_check_result
;
1920 set_bit(STRIPE_HANDLE
, &sh
->state
);
1921 raid5_release_stripe(sh
);
1924 static void ops_run_check_p(struct stripe_head
*sh
, struct raid5_percpu
*percpu
)
1926 int disks
= sh
->disks
;
1927 int pd_idx
= sh
->pd_idx
;
1928 int qd_idx
= sh
->qd_idx
;
1929 struct page
*xor_dest
;
1930 struct page
**xor_srcs
= to_addr_page(percpu
, 0);
1931 struct dma_async_tx_descriptor
*tx
;
1932 struct async_submit_ctl submit
;
1936 pr_debug("%s: stripe %llu\n", __func__
,
1937 (unsigned long long)sh
->sector
);
1939 BUG_ON(sh
->batch_head
);
1941 xor_dest
= sh
->dev
[pd_idx
].page
;
1942 xor_srcs
[count
++] = xor_dest
;
1943 for (i
= disks
; i
--; ) {
1944 if (i
== pd_idx
|| i
== qd_idx
)
1946 xor_srcs
[count
++] = sh
->dev
[i
].page
;
1949 init_async_submit(&submit
, 0, NULL
, NULL
, NULL
,
1950 to_addr_conv(sh
, percpu
, 0));
1951 tx
= async_xor_val(xor_dest
, xor_srcs
, 0, count
, STRIPE_SIZE
,
1952 &sh
->ops
.zero_sum_result
, &submit
);
1954 atomic_inc(&sh
->count
);
1955 init_async_submit(&submit
, ASYNC_TX_ACK
, tx
, ops_complete_check
, sh
, NULL
);
1956 tx
= async_trigger_callback(&submit
);
1959 static void ops_run_check_pq(struct stripe_head
*sh
, struct raid5_percpu
*percpu
, int checkp
)
1961 struct page
**srcs
= to_addr_page(percpu
, 0);
1962 struct async_submit_ctl submit
;
1965 pr_debug("%s: stripe %llu checkp: %d\n", __func__
,
1966 (unsigned long long)sh
->sector
, checkp
);
1968 BUG_ON(sh
->batch_head
);
1969 count
= set_syndrome_sources(srcs
, sh
, SYNDROME_SRC_ALL
);
1973 atomic_inc(&sh
->count
);
1974 init_async_submit(&submit
, ASYNC_TX_ACK
, NULL
, ops_complete_check
,
1975 sh
, to_addr_conv(sh
, percpu
, 0));
1976 async_syndrome_val(srcs
, 0, count
+2, STRIPE_SIZE
,
1977 &sh
->ops
.zero_sum_result
, percpu
->spare_page
, &submit
);
1980 static void raid_run_ops(struct stripe_head
*sh
, unsigned long ops_request
)
1982 int overlap_clear
= 0, i
, disks
= sh
->disks
;
1983 struct dma_async_tx_descriptor
*tx
= NULL
;
1984 struct r5conf
*conf
= sh
->raid_conf
;
1985 int level
= conf
->level
;
1986 struct raid5_percpu
*percpu
;
1990 percpu
= per_cpu_ptr(conf
->percpu
, cpu
);
1991 if (test_bit(STRIPE_OP_BIOFILL
, &ops_request
)) {
1992 ops_run_biofill(sh
);
1996 if (test_bit(STRIPE_OP_COMPUTE_BLK
, &ops_request
)) {
1998 tx
= ops_run_compute5(sh
, percpu
);
2000 if (sh
->ops
.target2
< 0 || sh
->ops
.target
< 0)
2001 tx
= ops_run_compute6_1(sh
, percpu
);
2003 tx
= ops_run_compute6_2(sh
, percpu
);
2005 /* terminate the chain if reconstruct is not set to be run */
2006 if (tx
&& !test_bit(STRIPE_OP_RECONSTRUCT
, &ops_request
))
2010 if (test_bit(STRIPE_OP_PREXOR
, &ops_request
)) {
2012 tx
= ops_run_prexor5(sh
, percpu
, tx
);
2014 tx
= ops_run_prexor6(sh
, percpu
, tx
);
2017 if (test_bit(STRIPE_OP_BIODRAIN
, &ops_request
)) {
2018 tx
= ops_run_biodrain(sh
, tx
);
2022 if (test_bit(STRIPE_OP_RECONSTRUCT
, &ops_request
)) {
2024 ops_run_reconstruct5(sh
, percpu
, tx
);
2026 ops_run_reconstruct6(sh
, percpu
, tx
);
2029 if (test_bit(STRIPE_OP_CHECK
, &ops_request
)) {
2030 if (sh
->check_state
== check_state_run
)
2031 ops_run_check_p(sh
, percpu
);
2032 else if (sh
->check_state
== check_state_run_q
)
2033 ops_run_check_pq(sh
, percpu
, 0);
2034 else if (sh
->check_state
== check_state_run_pq
)
2035 ops_run_check_pq(sh
, percpu
, 1);
2040 if (overlap_clear
&& !sh
->batch_head
)
2041 for (i
= disks
; i
--; ) {
2042 struct r5dev
*dev
= &sh
->dev
[i
];
2043 if (test_and_clear_bit(R5_Overlap
, &dev
->flags
))
2044 wake_up(&sh
->raid_conf
->wait_for_overlap
);
2049 static struct stripe_head
*alloc_stripe(struct kmem_cache
*sc
, gfp_t gfp
,
2052 struct stripe_head
*sh
;
2055 sh
= kmem_cache_zalloc(sc
, gfp
);
2057 spin_lock_init(&sh
->stripe_lock
);
2058 spin_lock_init(&sh
->batch_lock
);
2059 INIT_LIST_HEAD(&sh
->batch_list
);
2060 INIT_LIST_HEAD(&sh
->lru
);
2061 INIT_LIST_HEAD(&sh
->r5c
);
2062 INIT_LIST_HEAD(&sh
->log_list
);
2063 atomic_set(&sh
->count
, 1);
2064 sh
->log_start
= MaxSector
;
2065 for (i
= 0; i
< disks
; i
++) {
2066 struct r5dev
*dev
= &sh
->dev
[i
];
2068 bio_init(&dev
->req
, &dev
->vec
, 1);
2069 bio_init(&dev
->rreq
, &dev
->rvec
, 1);
2074 static int grow_one_stripe(struct r5conf
*conf
, gfp_t gfp
)
2076 struct stripe_head
*sh
;
2078 sh
= alloc_stripe(conf
->slab_cache
, gfp
, conf
->pool_size
);
2082 sh
->raid_conf
= conf
;
2084 if (grow_buffers(sh
, gfp
)) {
2086 kmem_cache_free(conf
->slab_cache
, sh
);
2089 sh
->hash_lock_index
=
2090 conf
->max_nr_stripes
% NR_STRIPE_HASH_LOCKS
;
2091 /* we just created an active stripe so... */
2092 atomic_inc(&conf
->active_stripes
);
2094 raid5_release_stripe(sh
);
2095 conf
->max_nr_stripes
++;
2099 static int grow_stripes(struct r5conf
*conf
, int num
)
2101 struct kmem_cache
*sc
;
2102 int devs
= max(conf
->raid_disks
, conf
->previous_raid_disks
);
2104 if (conf
->mddev
->gendisk
)
2105 sprintf(conf
->cache_name
[0],
2106 "raid%d-%s", conf
->level
, mdname(conf
->mddev
));
2108 sprintf(conf
->cache_name
[0],
2109 "raid%d-%p", conf
->level
, conf
->mddev
);
2110 sprintf(conf
->cache_name
[1], "%s-alt", conf
->cache_name
[0]);
2112 conf
->active_name
= 0;
2113 sc
= kmem_cache_create(conf
->cache_name
[conf
->active_name
],
2114 sizeof(struct stripe_head
)+(devs
-1)*sizeof(struct r5dev
),
2118 conf
->slab_cache
= sc
;
2119 conf
->pool_size
= devs
;
2121 if (!grow_one_stripe(conf
, GFP_KERNEL
))
2128 * scribble_len - return the required size of the scribble region
2129 * @num - total number of disks in the array
2131 * The size must be enough to contain:
2132 * 1/ a struct page pointer for each device in the array +2
2133 * 2/ room to convert each entry in (1) to its corresponding dma
2134 * (dma_map_page()) or page (page_address()) address.
2136 * Note: the +2 is for the destination buffers of the ddf/raid6 case where we
2137 * calculate over all devices (not just the data blocks), using zeros in place
2138 * of the P and Q blocks.
2140 static struct flex_array
*scribble_alloc(int num
, int cnt
, gfp_t flags
)
2142 struct flex_array
*ret
;
2145 len
= sizeof(struct page
*) * (num
+2) + sizeof(addr_conv_t
) * (num
+2);
2146 ret
= flex_array_alloc(len
, cnt
, flags
);
2149 /* always prealloc all elements, so no locking is required */
2150 if (flex_array_prealloc(ret
, 0, cnt
, flags
)) {
2151 flex_array_free(ret
);
2157 static int resize_chunks(struct r5conf
*conf
, int new_disks
, int new_sectors
)
2163 * Never shrink. And mddev_suspend() could deadlock if this is called
2164 * from raid5d. In that case, scribble_disks and scribble_sectors
2165 * should equal to new_disks and new_sectors
2167 if (conf
->scribble_disks
>= new_disks
&&
2168 conf
->scribble_sectors
>= new_sectors
)
2170 mddev_suspend(conf
->mddev
);
2172 for_each_present_cpu(cpu
) {
2173 struct raid5_percpu
*percpu
;
2174 struct flex_array
*scribble
;
2176 percpu
= per_cpu_ptr(conf
->percpu
, cpu
);
2177 scribble
= scribble_alloc(new_disks
,
2178 new_sectors
/ STRIPE_SECTORS
,
2182 flex_array_free(percpu
->scribble
);
2183 percpu
->scribble
= scribble
;
2190 mddev_resume(conf
->mddev
);
2192 conf
->scribble_disks
= new_disks
;
2193 conf
->scribble_sectors
= new_sectors
;
2198 static int resize_stripes(struct r5conf
*conf
, int newsize
)
2200 /* Make all the stripes able to hold 'newsize' devices.
2201 * New slots in each stripe get 'page' set to a new page.
2203 * This happens in stages:
2204 * 1/ create a new kmem_cache and allocate the required number of
2206 * 2/ gather all the old stripe_heads and transfer the pages across
2207 * to the new stripe_heads. This will have the side effect of
2208 * freezing the array as once all stripe_heads have been collected,
2209 * no IO will be possible. Old stripe heads are freed once their
2210 * pages have been transferred over, and the old kmem_cache is
2211 * freed when all stripes are done.
2212 * 3/ reallocate conf->disks to be suitable bigger. If this fails,
2213 * we simple return a failre status - no need to clean anything up.
2214 * 4/ allocate new pages for the new slots in the new stripe_heads.
2215 * If this fails, we don't bother trying the shrink the
2216 * stripe_heads down again, we just leave them as they are.
2217 * As each stripe_head is processed the new one is released into
2220 * Once step2 is started, we cannot afford to wait for a write,
2221 * so we use GFP_NOIO allocations.
2223 struct stripe_head
*osh
, *nsh
;
2224 LIST_HEAD(newstripes
);
2225 struct disk_info
*ndisks
;
2227 struct kmem_cache
*sc
;
2231 if (newsize
<= conf
->pool_size
)
2232 return 0; /* never bother to shrink */
2234 err
= md_allow_write(conf
->mddev
);
2239 sc
= kmem_cache_create(conf
->cache_name
[1-conf
->active_name
],
2240 sizeof(struct stripe_head
)+(newsize
-1)*sizeof(struct r5dev
),
2245 /* Need to ensure auto-resizing doesn't interfere */
2246 mutex_lock(&conf
->cache_size_mutex
);
2248 for (i
= conf
->max_nr_stripes
; i
; i
--) {
2249 nsh
= alloc_stripe(sc
, GFP_KERNEL
, newsize
);
2253 nsh
->raid_conf
= conf
;
2254 list_add(&nsh
->lru
, &newstripes
);
2257 /* didn't get enough, give up */
2258 while (!list_empty(&newstripes
)) {
2259 nsh
= list_entry(newstripes
.next
, struct stripe_head
, lru
);
2260 list_del(&nsh
->lru
);
2261 kmem_cache_free(sc
, nsh
);
2263 kmem_cache_destroy(sc
);
2264 mutex_unlock(&conf
->cache_size_mutex
);
2267 /* Step 2 - Must use GFP_NOIO now.
2268 * OK, we have enough stripes, start collecting inactive
2269 * stripes and copying them over
2273 list_for_each_entry(nsh
, &newstripes
, lru
) {
2274 lock_device_hash_lock(conf
, hash
);
2275 wait_event_cmd(conf
->wait_for_stripe
,
2276 !list_empty(conf
->inactive_list
+ hash
),
2277 unlock_device_hash_lock(conf
, hash
),
2278 lock_device_hash_lock(conf
, hash
));
2279 osh
= get_free_stripe(conf
, hash
);
2280 unlock_device_hash_lock(conf
, hash
);
2282 for(i
=0; i
<conf
->pool_size
; i
++) {
2283 nsh
->dev
[i
].page
= osh
->dev
[i
].page
;
2284 nsh
->dev
[i
].orig_page
= osh
->dev
[i
].page
;
2286 nsh
->hash_lock_index
= hash
;
2287 kmem_cache_free(conf
->slab_cache
, osh
);
2289 if (cnt
>= conf
->max_nr_stripes
/ NR_STRIPE_HASH_LOCKS
+
2290 !!((conf
->max_nr_stripes
% NR_STRIPE_HASH_LOCKS
) > hash
)) {
2295 kmem_cache_destroy(conf
->slab_cache
);
2298 * At this point, we are holding all the stripes so the array
2299 * is completely stalled, so now is a good time to resize
2300 * conf->disks and the scribble region
2302 ndisks
= kzalloc(newsize
* sizeof(struct disk_info
), GFP_NOIO
);
2304 for (i
= 0; i
< conf
->pool_size
; i
++)
2305 ndisks
[i
] = conf
->disks
[i
];
2307 for (i
= conf
->pool_size
; i
< newsize
; i
++) {
2308 ndisks
[i
].extra_page
= alloc_page(GFP_NOIO
);
2309 if (!ndisks
[i
].extra_page
)
2314 for (i
= conf
->pool_size
; i
< newsize
; i
++)
2315 if (ndisks
[i
].extra_page
)
2316 put_page(ndisks
[i
].extra_page
);
2320 conf
->disks
= ndisks
;
2325 mutex_unlock(&conf
->cache_size_mutex
);
2326 /* Step 4, return new stripes to service */
2327 while(!list_empty(&newstripes
)) {
2328 nsh
= list_entry(newstripes
.next
, struct stripe_head
, lru
);
2329 list_del_init(&nsh
->lru
);
2331 for (i
=conf
->raid_disks
; i
< newsize
; i
++)
2332 if (nsh
->dev
[i
].page
== NULL
) {
2333 struct page
*p
= alloc_page(GFP_NOIO
);
2334 nsh
->dev
[i
].page
= p
;
2335 nsh
->dev
[i
].orig_page
= p
;
2339 raid5_release_stripe(nsh
);
2341 /* critical section pass, GFP_NOIO no longer needed */
2343 conf
->slab_cache
= sc
;
2344 conf
->active_name
= 1-conf
->active_name
;
2346 conf
->pool_size
= newsize
;
2350 static int drop_one_stripe(struct r5conf
*conf
)
2352 struct stripe_head
*sh
;
2353 int hash
= (conf
->max_nr_stripes
- 1) & STRIPE_HASH_LOCKS_MASK
;
2355 spin_lock_irq(conf
->hash_locks
+ hash
);
2356 sh
= get_free_stripe(conf
, hash
);
2357 spin_unlock_irq(conf
->hash_locks
+ hash
);
2360 BUG_ON(atomic_read(&sh
->count
));
2362 kmem_cache_free(conf
->slab_cache
, sh
);
2363 atomic_dec(&conf
->active_stripes
);
2364 conf
->max_nr_stripes
--;
2368 static void shrink_stripes(struct r5conf
*conf
)
2370 while (conf
->max_nr_stripes
&&
2371 drop_one_stripe(conf
))
2374 kmem_cache_destroy(conf
->slab_cache
);
2375 conf
->slab_cache
= NULL
;
2378 static void raid5_end_read_request(struct bio
* bi
)
2380 struct stripe_head
*sh
= bi
->bi_private
;
2381 struct r5conf
*conf
= sh
->raid_conf
;
2382 int disks
= sh
->disks
, i
;
2383 char b
[BDEVNAME_SIZE
];
2384 struct md_rdev
*rdev
= NULL
;
2387 for (i
=0 ; i
<disks
; i
++)
2388 if (bi
== &sh
->dev
[i
].req
)
2391 pr_debug("end_read_request %llu/%d, count: %d, error %d.\n",
2392 (unsigned long long)sh
->sector
, i
, atomic_read(&sh
->count
),
2399 if (test_bit(R5_ReadRepl
, &sh
->dev
[i
].flags
))
2400 /* If replacement finished while this request was outstanding,
2401 * 'replacement' might be NULL already.
2402 * In that case it moved down to 'rdev'.
2403 * rdev is not removed until all requests are finished.
2405 rdev
= conf
->disks
[i
].replacement
;
2407 rdev
= conf
->disks
[i
].rdev
;
2409 if (use_new_offset(conf
, sh
))
2410 s
= sh
->sector
+ rdev
->new_data_offset
;
2412 s
= sh
->sector
+ rdev
->data_offset
;
2413 if (!bi
->bi_error
) {
2414 set_bit(R5_UPTODATE
, &sh
->dev
[i
].flags
);
2415 if (test_bit(R5_ReadError
, &sh
->dev
[i
].flags
)) {
2416 /* Note that this cannot happen on a
2417 * replacement device. We just fail those on
2420 pr_info_ratelimited(
2421 "md/raid:%s: read error corrected (%lu sectors at %llu on %s)\n",
2422 mdname(conf
->mddev
), STRIPE_SECTORS
,
2423 (unsigned long long)s
,
2424 bdevname(rdev
->bdev
, b
));
2425 atomic_add(STRIPE_SECTORS
, &rdev
->corrected_errors
);
2426 clear_bit(R5_ReadError
, &sh
->dev
[i
].flags
);
2427 clear_bit(R5_ReWrite
, &sh
->dev
[i
].flags
);
2428 } else if (test_bit(R5_ReadNoMerge
, &sh
->dev
[i
].flags
))
2429 clear_bit(R5_ReadNoMerge
, &sh
->dev
[i
].flags
);
2431 if (test_bit(R5_InJournal
, &sh
->dev
[i
].flags
))
2433 * end read for a page in journal, this
2434 * must be preparing for prexor in rmw
2436 set_bit(R5_OrigPageUPTDODATE
, &sh
->dev
[i
].flags
);
2438 if (atomic_read(&rdev
->read_errors
))
2439 atomic_set(&rdev
->read_errors
, 0);
2441 const char *bdn
= bdevname(rdev
->bdev
, b
);
2445 clear_bit(R5_UPTODATE
, &sh
->dev
[i
].flags
);
2446 atomic_inc(&rdev
->read_errors
);
2447 if (test_bit(R5_ReadRepl
, &sh
->dev
[i
].flags
))
2448 pr_warn_ratelimited(
2449 "md/raid:%s: read error on replacement device (sector %llu on %s).\n",
2450 mdname(conf
->mddev
),
2451 (unsigned long long)s
,
2453 else if (conf
->mddev
->degraded
>= conf
->max_degraded
) {
2455 pr_warn_ratelimited(
2456 "md/raid:%s: read error not correctable (sector %llu on %s).\n",
2457 mdname(conf
->mddev
),
2458 (unsigned long long)s
,
2460 } else if (test_bit(R5_ReWrite
, &sh
->dev
[i
].flags
)) {
2463 pr_warn_ratelimited(
2464 "md/raid:%s: read error NOT corrected!! (sector %llu on %s).\n",
2465 mdname(conf
->mddev
),
2466 (unsigned long long)s
,
2468 } else if (atomic_read(&rdev
->read_errors
)
2469 > conf
->max_nr_stripes
)
2470 pr_warn("md/raid:%s: Too many read errors, failing device %s.\n",
2471 mdname(conf
->mddev
), bdn
);
2474 if (set_bad
&& test_bit(In_sync
, &rdev
->flags
)
2475 && !test_bit(R5_ReadNoMerge
, &sh
->dev
[i
].flags
))
2478 if (test_bit(R5_ReadNoMerge
, &sh
->dev
[i
].flags
)) {
2479 set_bit(R5_ReadError
, &sh
->dev
[i
].flags
);
2480 clear_bit(R5_ReadNoMerge
, &sh
->dev
[i
].flags
);
2482 set_bit(R5_ReadNoMerge
, &sh
->dev
[i
].flags
);
2484 clear_bit(R5_ReadError
, &sh
->dev
[i
].flags
);
2485 clear_bit(R5_ReWrite
, &sh
->dev
[i
].flags
);
2487 && test_bit(In_sync
, &rdev
->flags
)
2488 && rdev_set_badblocks(
2489 rdev
, sh
->sector
, STRIPE_SECTORS
, 0)))
2490 md_error(conf
->mddev
, rdev
);
2493 rdev_dec_pending(rdev
, conf
->mddev
);
2495 clear_bit(R5_LOCKED
, &sh
->dev
[i
].flags
);
2496 set_bit(STRIPE_HANDLE
, &sh
->state
);
2497 raid5_release_stripe(sh
);
2500 static void raid5_end_write_request(struct bio
*bi
)
2502 struct stripe_head
*sh
= bi
->bi_private
;
2503 struct r5conf
*conf
= sh
->raid_conf
;
2504 int disks
= sh
->disks
, i
;
2505 struct md_rdev
*uninitialized_var(rdev
);
2508 int replacement
= 0;
2510 for (i
= 0 ; i
< disks
; i
++) {
2511 if (bi
== &sh
->dev
[i
].req
) {
2512 rdev
= conf
->disks
[i
].rdev
;
2515 if (bi
== &sh
->dev
[i
].rreq
) {
2516 rdev
= conf
->disks
[i
].replacement
;
2520 /* rdev was removed and 'replacement'
2521 * replaced it. rdev is not removed
2522 * until all requests are finished.
2524 rdev
= conf
->disks
[i
].rdev
;
2528 pr_debug("end_write_request %llu/%d, count %d, error: %d.\n",
2529 (unsigned long long)sh
->sector
, i
, atomic_read(&sh
->count
),
2539 md_error(conf
->mddev
, rdev
);
2540 else if (is_badblock(rdev
, sh
->sector
,
2542 &first_bad
, &bad_sectors
))
2543 set_bit(R5_MadeGoodRepl
, &sh
->dev
[i
].flags
);
2546 set_bit(STRIPE_DEGRADED
, &sh
->state
);
2547 set_bit(WriteErrorSeen
, &rdev
->flags
);
2548 set_bit(R5_WriteError
, &sh
->dev
[i
].flags
);
2549 if (!test_and_set_bit(WantReplacement
, &rdev
->flags
))
2550 set_bit(MD_RECOVERY_NEEDED
,
2551 &rdev
->mddev
->recovery
);
2552 } else if (is_badblock(rdev
, sh
->sector
,
2554 &first_bad
, &bad_sectors
)) {
2555 set_bit(R5_MadeGood
, &sh
->dev
[i
].flags
);
2556 if (test_bit(R5_ReadError
, &sh
->dev
[i
].flags
))
2557 /* That was a successful write so make
2558 * sure it looks like we already did
2561 set_bit(R5_ReWrite
, &sh
->dev
[i
].flags
);
2564 rdev_dec_pending(rdev
, conf
->mddev
);
2566 if (sh
->batch_head
&& bi
->bi_error
&& !replacement
)
2567 set_bit(STRIPE_BATCH_ERR
, &sh
->batch_head
->state
);
2570 if (!test_and_clear_bit(R5_DOUBLE_LOCKED
, &sh
->dev
[i
].flags
))
2571 clear_bit(R5_LOCKED
, &sh
->dev
[i
].flags
);
2572 set_bit(STRIPE_HANDLE
, &sh
->state
);
2573 raid5_release_stripe(sh
);
2575 if (sh
->batch_head
&& sh
!= sh
->batch_head
)
2576 raid5_release_stripe(sh
->batch_head
);
2579 static void raid5_build_block(struct stripe_head
*sh
, int i
, int previous
)
2581 struct r5dev
*dev
= &sh
->dev
[i
];
2584 dev
->sector
= raid5_compute_blocknr(sh
, i
, previous
);
2587 static void raid5_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
2589 char b
[BDEVNAME_SIZE
];
2590 struct r5conf
*conf
= mddev
->private;
2591 unsigned long flags
;
2592 pr_debug("raid456: error called\n");
2594 spin_lock_irqsave(&conf
->device_lock
, flags
);
2595 clear_bit(In_sync
, &rdev
->flags
);
2596 mddev
->degraded
= raid5_calc_degraded(conf
);
2597 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
2598 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2600 set_bit(Blocked
, &rdev
->flags
);
2601 set_bit(Faulty
, &rdev
->flags
);
2602 set_mask_bits(&mddev
->sb_flags
, 0,
2603 BIT(MD_SB_CHANGE_DEVS
) | BIT(MD_SB_CHANGE_PENDING
));
2604 pr_crit("md/raid:%s: Disk failure on %s, disabling device.\n"
2605 "md/raid:%s: Operation continuing on %d devices.\n",
2607 bdevname(rdev
->bdev
, b
),
2609 conf
->raid_disks
- mddev
->degraded
);
2610 r5c_update_on_rdev_error(mddev
);
2614 * Input: a 'big' sector number,
2615 * Output: index of the data and parity disk, and the sector # in them.
2617 sector_t
raid5_compute_sector(struct r5conf
*conf
, sector_t r_sector
,
2618 int previous
, int *dd_idx
,
2619 struct stripe_head
*sh
)
2621 sector_t stripe
, stripe2
;
2622 sector_t chunk_number
;
2623 unsigned int chunk_offset
;
2626 sector_t new_sector
;
2627 int algorithm
= previous
? conf
->prev_algo
2629 int sectors_per_chunk
= previous
? conf
->prev_chunk_sectors
2630 : conf
->chunk_sectors
;
2631 int raid_disks
= previous
? conf
->previous_raid_disks
2633 int data_disks
= raid_disks
- conf
->max_degraded
;
2635 /* First compute the information on this sector */
2638 * Compute the chunk number and the sector offset inside the chunk
2640 chunk_offset
= sector_div(r_sector
, sectors_per_chunk
);
2641 chunk_number
= r_sector
;
2644 * Compute the stripe number
2646 stripe
= chunk_number
;
2647 *dd_idx
= sector_div(stripe
, data_disks
);
2650 * Select the parity disk based on the user selected algorithm.
2652 pd_idx
= qd_idx
= -1;
2653 switch(conf
->level
) {
2655 pd_idx
= data_disks
;
2658 switch (algorithm
) {
2659 case ALGORITHM_LEFT_ASYMMETRIC
:
2660 pd_idx
= data_disks
- sector_div(stripe2
, raid_disks
);
2661 if (*dd_idx
>= pd_idx
)
2664 case ALGORITHM_RIGHT_ASYMMETRIC
:
2665 pd_idx
= sector_div(stripe2
, raid_disks
);
2666 if (*dd_idx
>= pd_idx
)
2669 case ALGORITHM_LEFT_SYMMETRIC
:
2670 pd_idx
= data_disks
- sector_div(stripe2
, raid_disks
);
2671 *dd_idx
= (pd_idx
+ 1 + *dd_idx
) % raid_disks
;
2673 case ALGORITHM_RIGHT_SYMMETRIC
:
2674 pd_idx
= sector_div(stripe2
, raid_disks
);
2675 *dd_idx
= (pd_idx
+ 1 + *dd_idx
) % raid_disks
;
2677 case ALGORITHM_PARITY_0
:
2681 case ALGORITHM_PARITY_N
:
2682 pd_idx
= data_disks
;
2690 switch (algorithm
) {
2691 case ALGORITHM_LEFT_ASYMMETRIC
:
2692 pd_idx
= raid_disks
- 1 - sector_div(stripe2
, raid_disks
);
2693 qd_idx
= pd_idx
+ 1;
2694 if (pd_idx
== raid_disks
-1) {
2695 (*dd_idx
)++; /* Q D D D P */
2697 } else if (*dd_idx
>= pd_idx
)
2698 (*dd_idx
) += 2; /* D D P Q D */
2700 case ALGORITHM_RIGHT_ASYMMETRIC
:
2701 pd_idx
= sector_div(stripe2
, raid_disks
);
2702 qd_idx
= pd_idx
+ 1;
2703 if (pd_idx
== raid_disks
-1) {
2704 (*dd_idx
)++; /* Q D D D P */
2706 } else if (*dd_idx
>= pd_idx
)
2707 (*dd_idx
) += 2; /* D D P Q D */
2709 case ALGORITHM_LEFT_SYMMETRIC
:
2710 pd_idx
= raid_disks
- 1 - sector_div(stripe2
, raid_disks
);
2711 qd_idx
= (pd_idx
+ 1) % raid_disks
;
2712 *dd_idx
= (pd_idx
+ 2 + *dd_idx
) % raid_disks
;
2714 case ALGORITHM_RIGHT_SYMMETRIC
:
2715 pd_idx
= sector_div(stripe2
, raid_disks
);
2716 qd_idx
= (pd_idx
+ 1) % raid_disks
;
2717 *dd_idx
= (pd_idx
+ 2 + *dd_idx
) % raid_disks
;
2720 case ALGORITHM_PARITY_0
:
2725 case ALGORITHM_PARITY_N
:
2726 pd_idx
= data_disks
;
2727 qd_idx
= data_disks
+ 1;
2730 case ALGORITHM_ROTATING_ZERO_RESTART
:
2731 /* Exactly the same as RIGHT_ASYMMETRIC, but or
2732 * of blocks for computing Q is different.
2734 pd_idx
= sector_div(stripe2
, raid_disks
);
2735 qd_idx
= pd_idx
+ 1;
2736 if (pd_idx
== raid_disks
-1) {
2737 (*dd_idx
)++; /* Q D D D P */
2739 } else if (*dd_idx
>= pd_idx
)
2740 (*dd_idx
) += 2; /* D D P Q D */
2744 case ALGORITHM_ROTATING_N_RESTART
:
2745 /* Same a left_asymmetric, by first stripe is
2746 * D D D P Q rather than
2750 pd_idx
= raid_disks
- 1 - sector_div(stripe2
, raid_disks
);
2751 qd_idx
= pd_idx
+ 1;
2752 if (pd_idx
== raid_disks
-1) {
2753 (*dd_idx
)++; /* Q D D D P */
2755 } else if (*dd_idx
>= pd_idx
)
2756 (*dd_idx
) += 2; /* D D P Q D */
2760 case ALGORITHM_ROTATING_N_CONTINUE
:
2761 /* Same as left_symmetric but Q is before P */
2762 pd_idx
= raid_disks
- 1 - sector_div(stripe2
, raid_disks
);
2763 qd_idx
= (pd_idx
+ raid_disks
- 1) % raid_disks
;
2764 *dd_idx
= (pd_idx
+ 1 + *dd_idx
) % raid_disks
;
2768 case ALGORITHM_LEFT_ASYMMETRIC_6
:
2769 /* RAID5 left_asymmetric, with Q on last device */
2770 pd_idx
= data_disks
- sector_div(stripe2
, raid_disks
-1);
2771 if (*dd_idx
>= pd_idx
)
2773 qd_idx
= raid_disks
- 1;
2776 case ALGORITHM_RIGHT_ASYMMETRIC_6
:
2777 pd_idx
= sector_div(stripe2
, raid_disks
-1);
2778 if (*dd_idx
>= pd_idx
)
2780 qd_idx
= raid_disks
- 1;
2783 case ALGORITHM_LEFT_SYMMETRIC_6
:
2784 pd_idx
= data_disks
- sector_div(stripe2
, raid_disks
-1);
2785 *dd_idx
= (pd_idx
+ 1 + *dd_idx
) % (raid_disks
-1);
2786 qd_idx
= raid_disks
- 1;
2789 case ALGORITHM_RIGHT_SYMMETRIC_6
:
2790 pd_idx
= sector_div(stripe2
, raid_disks
-1);
2791 *dd_idx
= (pd_idx
+ 1 + *dd_idx
) % (raid_disks
-1);
2792 qd_idx
= raid_disks
- 1;
2795 case ALGORITHM_PARITY_0_6
:
2798 qd_idx
= raid_disks
- 1;
2808 sh
->pd_idx
= pd_idx
;
2809 sh
->qd_idx
= qd_idx
;
2810 sh
->ddf_layout
= ddf_layout
;
2813 * Finally, compute the new sector number
2815 new_sector
= (sector_t
)stripe
* sectors_per_chunk
+ chunk_offset
;
2819 sector_t
raid5_compute_blocknr(struct stripe_head
*sh
, int i
, int previous
)
2821 struct r5conf
*conf
= sh
->raid_conf
;
2822 int raid_disks
= sh
->disks
;
2823 int data_disks
= raid_disks
- conf
->max_degraded
;
2824 sector_t new_sector
= sh
->sector
, check
;
2825 int sectors_per_chunk
= previous
? conf
->prev_chunk_sectors
2826 : conf
->chunk_sectors
;
2827 int algorithm
= previous
? conf
->prev_algo
2831 sector_t chunk_number
;
2832 int dummy1
, dd_idx
= i
;
2834 struct stripe_head sh2
;
2836 chunk_offset
= sector_div(new_sector
, sectors_per_chunk
);
2837 stripe
= new_sector
;
2839 if (i
== sh
->pd_idx
)
2841 switch(conf
->level
) {
2844 switch (algorithm
) {
2845 case ALGORITHM_LEFT_ASYMMETRIC
:
2846 case ALGORITHM_RIGHT_ASYMMETRIC
:
2850 case ALGORITHM_LEFT_SYMMETRIC
:
2851 case ALGORITHM_RIGHT_SYMMETRIC
:
2854 i
-= (sh
->pd_idx
+ 1);
2856 case ALGORITHM_PARITY_0
:
2859 case ALGORITHM_PARITY_N
:
2866 if (i
== sh
->qd_idx
)
2867 return 0; /* It is the Q disk */
2868 switch (algorithm
) {
2869 case ALGORITHM_LEFT_ASYMMETRIC
:
2870 case ALGORITHM_RIGHT_ASYMMETRIC
:
2871 case ALGORITHM_ROTATING_ZERO_RESTART
:
2872 case ALGORITHM_ROTATING_N_RESTART
:
2873 if (sh
->pd_idx
== raid_disks
-1)
2874 i
--; /* Q D D D P */
2875 else if (i
> sh
->pd_idx
)
2876 i
-= 2; /* D D P Q D */
2878 case ALGORITHM_LEFT_SYMMETRIC
:
2879 case ALGORITHM_RIGHT_SYMMETRIC
:
2880 if (sh
->pd_idx
== raid_disks
-1)
2881 i
--; /* Q D D D P */
2886 i
-= (sh
->pd_idx
+ 2);
2889 case ALGORITHM_PARITY_0
:
2892 case ALGORITHM_PARITY_N
:
2894 case ALGORITHM_ROTATING_N_CONTINUE
:
2895 /* Like left_symmetric, but P is before Q */
2896 if (sh
->pd_idx
== 0)
2897 i
--; /* P D D D Q */
2902 i
-= (sh
->pd_idx
+ 1);
2905 case ALGORITHM_LEFT_ASYMMETRIC_6
:
2906 case ALGORITHM_RIGHT_ASYMMETRIC_6
:
2910 case ALGORITHM_LEFT_SYMMETRIC_6
:
2911 case ALGORITHM_RIGHT_SYMMETRIC_6
:
2913 i
+= data_disks
+ 1;
2914 i
-= (sh
->pd_idx
+ 1);
2916 case ALGORITHM_PARITY_0_6
:
2925 chunk_number
= stripe
* data_disks
+ i
;
2926 r_sector
= chunk_number
* sectors_per_chunk
+ chunk_offset
;
2928 check
= raid5_compute_sector(conf
, r_sector
,
2929 previous
, &dummy1
, &sh2
);
2930 if (check
!= sh
->sector
|| dummy1
!= dd_idx
|| sh2
.pd_idx
!= sh
->pd_idx
2931 || sh2
.qd_idx
!= sh
->qd_idx
) {
2932 pr_warn("md/raid:%s: compute_blocknr: map not correct\n",
2933 mdname(conf
->mddev
));
2940 * There are cases where we want handle_stripe_dirtying() and
2941 * schedule_reconstruction() to delay towrite to some dev of a stripe.
2943 * This function checks whether we want to delay the towrite. Specifically,
2944 * we delay the towrite when:
2946 * 1. degraded stripe has a non-overwrite to the missing dev, AND this
2947 * stripe has data in journal (for other devices).
2949 * In this case, when reading data for the non-overwrite dev, it is
2950 * necessary to handle complex rmw of write back cache (prexor with
2951 * orig_page, and xor with page). To keep read path simple, we would
2952 * like to flush data in journal to RAID disks first, so complex rmw
2953 * is handled in the write patch (handle_stripe_dirtying).
2955 * 2. when journal space is critical (R5C_LOG_CRITICAL=1)
2957 * It is important to be able to flush all stripes in raid5-cache.
2958 * Therefore, we need reserve some space on the journal device for
2959 * these flushes. If flush operation includes pending writes to the
2960 * stripe, we need to reserve (conf->raid_disk + 1) pages per stripe
2961 * for the flush out. If we exclude these pending writes from flush
2962 * operation, we only need (conf->max_degraded + 1) pages per stripe.
2963 * Therefore, excluding pending writes in these cases enables more
2964 * efficient use of the journal device.
2966 * Note: To make sure the stripe makes progress, we only delay
2967 * towrite for stripes with data already in journal (injournal > 0).
2968 * When LOG_CRITICAL, stripes with injournal == 0 will be sent to
2969 * no_space_stripes list.
2972 static inline bool delay_towrite(struct r5conf
*conf
,
2974 struct stripe_head_state
*s
)
2977 if (!test_bit(R5_OVERWRITE
, &dev
->flags
) &&
2978 !test_bit(R5_Insync
, &dev
->flags
) && s
->injournal
)
2981 if (test_bit(R5C_LOG_CRITICAL
, &conf
->cache_state
) &&
2988 schedule_reconstruction(struct stripe_head
*sh
, struct stripe_head_state
*s
,
2989 int rcw
, int expand
)
2991 int i
, pd_idx
= sh
->pd_idx
, qd_idx
= sh
->qd_idx
, disks
= sh
->disks
;
2992 struct r5conf
*conf
= sh
->raid_conf
;
2993 int level
= conf
->level
;
2997 * In some cases, handle_stripe_dirtying initially decided to
2998 * run rmw and allocates extra page for prexor. However, rcw is
2999 * cheaper later on. We need to free the extra page now,
3000 * because we won't be able to do that in ops_complete_prexor().
3002 r5c_release_extra_page(sh
);
3004 for (i
= disks
; i
--; ) {
3005 struct r5dev
*dev
= &sh
->dev
[i
];
3007 if (dev
->towrite
&& !delay_towrite(conf
, dev
, s
)) {
3008 set_bit(R5_LOCKED
, &dev
->flags
);
3009 set_bit(R5_Wantdrain
, &dev
->flags
);
3011 clear_bit(R5_UPTODATE
, &dev
->flags
);
3013 } else if (test_bit(R5_InJournal
, &dev
->flags
)) {
3014 set_bit(R5_LOCKED
, &dev
->flags
);
3018 /* if we are not expanding this is a proper write request, and
3019 * there will be bios with new data to be drained into the
3024 /* False alarm, nothing to do */
3026 sh
->reconstruct_state
= reconstruct_state_drain_run
;
3027 set_bit(STRIPE_OP_BIODRAIN
, &s
->ops_request
);
3029 sh
->reconstruct_state
= reconstruct_state_run
;
3031 set_bit(STRIPE_OP_RECONSTRUCT
, &s
->ops_request
);
3033 if (s
->locked
+ conf
->max_degraded
== disks
)
3034 if (!test_and_set_bit(STRIPE_FULL_WRITE
, &sh
->state
))
3035 atomic_inc(&conf
->pending_full_writes
);
3037 BUG_ON(!(test_bit(R5_UPTODATE
, &sh
->dev
[pd_idx
].flags
) ||
3038 test_bit(R5_Wantcompute
, &sh
->dev
[pd_idx
].flags
)));
3039 BUG_ON(level
== 6 &&
3040 (!(test_bit(R5_UPTODATE
, &sh
->dev
[qd_idx
].flags
) ||
3041 test_bit(R5_Wantcompute
, &sh
->dev
[qd_idx
].flags
))));
3043 for (i
= disks
; i
--; ) {
3044 struct r5dev
*dev
= &sh
->dev
[i
];
3045 if (i
== pd_idx
|| i
== qd_idx
)
3049 (test_bit(R5_UPTODATE
, &dev
->flags
) ||
3050 test_bit(R5_Wantcompute
, &dev
->flags
))) {
3051 set_bit(R5_Wantdrain
, &dev
->flags
);
3052 set_bit(R5_LOCKED
, &dev
->flags
);
3053 clear_bit(R5_UPTODATE
, &dev
->flags
);
3055 } else if (test_bit(R5_InJournal
, &dev
->flags
)) {
3056 set_bit(R5_LOCKED
, &dev
->flags
);
3061 /* False alarm - nothing to do */
3063 sh
->reconstruct_state
= reconstruct_state_prexor_drain_run
;
3064 set_bit(STRIPE_OP_PREXOR
, &s
->ops_request
);
3065 set_bit(STRIPE_OP_BIODRAIN
, &s
->ops_request
);
3066 set_bit(STRIPE_OP_RECONSTRUCT
, &s
->ops_request
);
3069 /* keep the parity disk(s) locked while asynchronous operations
3072 set_bit(R5_LOCKED
, &sh
->dev
[pd_idx
].flags
);
3073 clear_bit(R5_UPTODATE
, &sh
->dev
[pd_idx
].flags
);
3077 int qd_idx
= sh
->qd_idx
;
3078 struct r5dev
*dev
= &sh
->dev
[qd_idx
];
3080 set_bit(R5_LOCKED
, &dev
->flags
);
3081 clear_bit(R5_UPTODATE
, &dev
->flags
);
3085 pr_debug("%s: stripe %llu locked: %d ops_request: %lx\n",
3086 __func__
, (unsigned long long)sh
->sector
,
3087 s
->locked
, s
->ops_request
);
3091 * Each stripe/dev can have one or more bion attached.
3092 * toread/towrite point to the first in a chain.
3093 * The bi_next chain must be in order.
3095 static int add_stripe_bio(struct stripe_head
*sh
, struct bio
*bi
, int dd_idx
,
3096 int forwrite
, int previous
)
3099 struct r5conf
*conf
= sh
->raid_conf
;
3102 pr_debug("adding bi b#%llu to stripe s#%llu\n",
3103 (unsigned long long)bi
->bi_iter
.bi_sector
,
3104 (unsigned long long)sh
->sector
);
3107 * If several bio share a stripe. The bio bi_phys_segments acts as a
3108 * reference count to avoid race. The reference count should already be
3109 * increased before this function is called (for example, in
3110 * raid5_make_request()), so other bio sharing this stripe will not free the
3111 * stripe. If a stripe is owned by one stripe, the stripe lock will
3114 spin_lock_irq(&sh
->stripe_lock
);
3115 /* Don't allow new IO added to stripes in batch list */
3119 bip
= &sh
->dev
[dd_idx
].towrite
;
3123 bip
= &sh
->dev
[dd_idx
].toread
;
3124 while (*bip
&& (*bip
)->bi_iter
.bi_sector
< bi
->bi_iter
.bi_sector
) {
3125 if (bio_end_sector(*bip
) > bi
->bi_iter
.bi_sector
)
3127 bip
= & (*bip
)->bi_next
;
3129 if (*bip
&& (*bip
)->bi_iter
.bi_sector
< bio_end_sector(bi
))
3132 if (!forwrite
|| previous
)
3133 clear_bit(STRIPE_BATCH_READY
, &sh
->state
);
3135 BUG_ON(*bip
&& bi
->bi_next
&& (*bip
) != bi
->bi_next
);
3139 raid5_inc_bi_active_stripes(bi
);
3142 /* check if page is covered */
3143 sector_t sector
= sh
->dev
[dd_idx
].sector
;
3144 for (bi
=sh
->dev
[dd_idx
].towrite
;
3145 sector
< sh
->dev
[dd_idx
].sector
+ STRIPE_SECTORS
&&
3146 bi
&& bi
->bi_iter
.bi_sector
<= sector
;
3147 bi
= r5_next_bio(bi
, sh
->dev
[dd_idx
].sector
)) {
3148 if (bio_end_sector(bi
) >= sector
)
3149 sector
= bio_end_sector(bi
);
3151 if (sector
>= sh
->dev
[dd_idx
].sector
+ STRIPE_SECTORS
)
3152 if (!test_and_set_bit(R5_OVERWRITE
, &sh
->dev
[dd_idx
].flags
))
3153 sh
->overwrite_disks
++;
3156 pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n",
3157 (unsigned long long)(*bip
)->bi_iter
.bi_sector
,
3158 (unsigned long long)sh
->sector
, dd_idx
);
3160 if (conf
->mddev
->bitmap
&& firstwrite
) {
3161 /* Cannot hold spinlock over bitmap_startwrite,
3162 * but must ensure this isn't added to a batch until
3163 * we have added to the bitmap and set bm_seq.
3164 * So set STRIPE_BITMAP_PENDING to prevent
3166 * If multiple add_stripe_bio() calls race here they
3167 * much all set STRIPE_BITMAP_PENDING. So only the first one
3168 * to complete "bitmap_startwrite" gets to set
3169 * STRIPE_BIT_DELAY. This is important as once a stripe
3170 * is added to a batch, STRIPE_BIT_DELAY cannot be changed
3173 set_bit(STRIPE_BITMAP_PENDING
, &sh
->state
);
3174 spin_unlock_irq(&sh
->stripe_lock
);
3175 bitmap_startwrite(conf
->mddev
->bitmap
, sh
->sector
,
3177 spin_lock_irq(&sh
->stripe_lock
);
3178 clear_bit(STRIPE_BITMAP_PENDING
, &sh
->state
);
3179 if (!sh
->batch_head
) {
3180 sh
->bm_seq
= conf
->seq_flush
+1;
3181 set_bit(STRIPE_BIT_DELAY
, &sh
->state
);
3184 spin_unlock_irq(&sh
->stripe_lock
);
3186 if (stripe_can_batch(sh
))
3187 stripe_add_to_batch_list(conf
, sh
);
3191 set_bit(R5_Overlap
, &sh
->dev
[dd_idx
].flags
);
3192 spin_unlock_irq(&sh
->stripe_lock
);
3196 static void end_reshape(struct r5conf
*conf
);
3198 static void stripe_set_idx(sector_t stripe
, struct r5conf
*conf
, int previous
,
3199 struct stripe_head
*sh
)
3201 int sectors_per_chunk
=
3202 previous
? conf
->prev_chunk_sectors
: conf
->chunk_sectors
;
3204 int chunk_offset
= sector_div(stripe
, sectors_per_chunk
);
3205 int disks
= previous
? conf
->previous_raid_disks
: conf
->raid_disks
;
3207 raid5_compute_sector(conf
,
3208 stripe
* (disks
- conf
->max_degraded
)
3209 *sectors_per_chunk
+ chunk_offset
,
3215 handle_failed_stripe(struct r5conf
*conf
, struct stripe_head
*sh
,
3216 struct stripe_head_state
*s
, int disks
,
3217 struct bio_list
*return_bi
)
3220 BUG_ON(sh
->batch_head
);
3221 for (i
= disks
; i
--; ) {
3225 if (test_bit(R5_ReadError
, &sh
->dev
[i
].flags
)) {
3226 struct md_rdev
*rdev
;
3228 rdev
= rcu_dereference(conf
->disks
[i
].rdev
);
3229 if (rdev
&& test_bit(In_sync
, &rdev
->flags
) &&
3230 !test_bit(Faulty
, &rdev
->flags
))
3231 atomic_inc(&rdev
->nr_pending
);
3236 if (!rdev_set_badblocks(
3240 md_error(conf
->mddev
, rdev
);
3241 rdev_dec_pending(rdev
, conf
->mddev
);
3244 spin_lock_irq(&sh
->stripe_lock
);
3245 /* fail all writes first */
3246 bi
= sh
->dev
[i
].towrite
;
3247 sh
->dev
[i
].towrite
= NULL
;
3248 sh
->overwrite_disks
= 0;
3249 spin_unlock_irq(&sh
->stripe_lock
);
3253 r5l_stripe_write_finished(sh
);
3255 if (test_and_clear_bit(R5_Overlap
, &sh
->dev
[i
].flags
))
3256 wake_up(&conf
->wait_for_overlap
);
3258 while (bi
&& bi
->bi_iter
.bi_sector
<
3259 sh
->dev
[i
].sector
+ STRIPE_SECTORS
) {
3260 struct bio
*nextbi
= r5_next_bio(bi
, sh
->dev
[i
].sector
);
3262 bi
->bi_error
= -EIO
;
3263 if (!raid5_dec_bi_active_stripes(bi
)) {
3264 md_write_end(conf
->mddev
);
3265 bio_list_add(return_bi
, bi
);
3270 bitmap_endwrite(conf
->mddev
->bitmap
, sh
->sector
,
3271 STRIPE_SECTORS
, 0, 0);
3273 /* and fail all 'written' */
3274 bi
= sh
->dev
[i
].written
;
3275 sh
->dev
[i
].written
= NULL
;
3276 if (test_and_clear_bit(R5_SkipCopy
, &sh
->dev
[i
].flags
)) {
3277 WARN_ON(test_bit(R5_UPTODATE
, &sh
->dev
[i
].flags
));
3278 sh
->dev
[i
].page
= sh
->dev
[i
].orig_page
;
3281 if (bi
) bitmap_end
= 1;
3282 while (bi
&& bi
->bi_iter
.bi_sector
<
3283 sh
->dev
[i
].sector
+ STRIPE_SECTORS
) {
3284 struct bio
*bi2
= r5_next_bio(bi
, sh
->dev
[i
].sector
);
3286 bi
->bi_error
= -EIO
;
3287 if (!raid5_dec_bi_active_stripes(bi
)) {
3288 md_write_end(conf
->mddev
);
3289 bio_list_add(return_bi
, bi
);
3294 /* fail any reads if this device is non-operational and
3295 * the data has not reached the cache yet.
3297 if (!test_bit(R5_Wantfill
, &sh
->dev
[i
].flags
) &&
3298 s
->failed
> conf
->max_degraded
&&
3299 (!test_bit(R5_Insync
, &sh
->dev
[i
].flags
) ||
3300 test_bit(R5_ReadError
, &sh
->dev
[i
].flags
))) {
3301 spin_lock_irq(&sh
->stripe_lock
);
3302 bi
= sh
->dev
[i
].toread
;
3303 sh
->dev
[i
].toread
= NULL
;
3304 spin_unlock_irq(&sh
->stripe_lock
);
3305 if (test_and_clear_bit(R5_Overlap
, &sh
->dev
[i
].flags
))
3306 wake_up(&conf
->wait_for_overlap
);
3309 while (bi
&& bi
->bi_iter
.bi_sector
<
3310 sh
->dev
[i
].sector
+ STRIPE_SECTORS
) {
3311 struct bio
*nextbi
=
3312 r5_next_bio(bi
, sh
->dev
[i
].sector
);
3314 bi
->bi_error
= -EIO
;
3315 if (!raid5_dec_bi_active_stripes(bi
))
3316 bio_list_add(return_bi
, bi
);
3321 bitmap_endwrite(conf
->mddev
->bitmap
, sh
->sector
,
3322 STRIPE_SECTORS
, 0, 0);
3323 /* If we were in the middle of a write the parity block might
3324 * still be locked - so just clear all R5_LOCKED flags
3326 clear_bit(R5_LOCKED
, &sh
->dev
[i
].flags
);
3331 if (test_and_clear_bit(STRIPE_FULL_WRITE
, &sh
->state
))
3332 if (atomic_dec_and_test(&conf
->pending_full_writes
))
3333 md_wakeup_thread(conf
->mddev
->thread
);
3337 handle_failed_sync(struct r5conf
*conf
, struct stripe_head
*sh
,
3338 struct stripe_head_state
*s
)
3343 BUG_ON(sh
->batch_head
);
3344 clear_bit(STRIPE_SYNCING
, &sh
->state
);
3345 if (test_and_clear_bit(R5_Overlap
, &sh
->dev
[sh
->pd_idx
].flags
))
3346 wake_up(&conf
->wait_for_overlap
);
3349 /* There is nothing more to do for sync/check/repair.
3350 * Don't even need to abort as that is handled elsewhere
3351 * if needed, and not always wanted e.g. if there is a known
3353 * For recover/replace we need to record a bad block on all
3354 * non-sync devices, or abort the recovery
3356 if (test_bit(MD_RECOVERY_RECOVER
, &conf
->mddev
->recovery
)) {
3357 /* During recovery devices cannot be removed, so
3358 * locking and refcounting of rdevs is not needed
3361 for (i
= 0; i
< conf
->raid_disks
; i
++) {
3362 struct md_rdev
*rdev
= rcu_dereference(conf
->disks
[i
].rdev
);
3364 && !test_bit(Faulty
, &rdev
->flags
)
3365 && !test_bit(In_sync
, &rdev
->flags
)
3366 && !rdev_set_badblocks(rdev
, sh
->sector
,
3369 rdev
= rcu_dereference(conf
->disks
[i
].replacement
);
3371 && !test_bit(Faulty
, &rdev
->flags
)
3372 && !test_bit(In_sync
, &rdev
->flags
)
3373 && !rdev_set_badblocks(rdev
, sh
->sector
,
3379 conf
->recovery_disabled
=
3380 conf
->mddev
->recovery_disabled
;
3382 md_done_sync(conf
->mddev
, STRIPE_SECTORS
, !abort
);
3385 static int want_replace(struct stripe_head
*sh
, int disk_idx
)
3387 struct md_rdev
*rdev
;
3391 rdev
= rcu_dereference(sh
->raid_conf
->disks
[disk_idx
].replacement
);
3393 && !test_bit(Faulty
, &rdev
->flags
)
3394 && !test_bit(In_sync
, &rdev
->flags
)
3395 && (rdev
->recovery_offset
<= sh
->sector
3396 || rdev
->mddev
->recovery_cp
<= sh
->sector
))
3402 static int need_this_block(struct stripe_head
*sh
, struct stripe_head_state
*s
,
3403 int disk_idx
, int disks
)
3405 struct r5dev
*dev
= &sh
->dev
[disk_idx
];
3406 struct r5dev
*fdev
[2] = { &sh
->dev
[s
->failed_num
[0]],
3407 &sh
->dev
[s
->failed_num
[1]] };
3411 if (test_bit(R5_LOCKED
, &dev
->flags
) ||
3412 test_bit(R5_UPTODATE
, &dev
->flags
))
3413 /* No point reading this as we already have it or have
3414 * decided to get it.
3419 (dev
->towrite
&& !test_bit(R5_OVERWRITE
, &dev
->flags
)))
3420 /* We need this block to directly satisfy a request */
3423 if (s
->syncing
|| s
->expanding
||
3424 (s
->replacing
&& want_replace(sh
, disk_idx
)))
3425 /* When syncing, or expanding we read everything.
3426 * When replacing, we need the replaced block.
3430 if ((s
->failed
>= 1 && fdev
[0]->toread
) ||
3431 (s
->failed
>= 2 && fdev
[1]->toread
))
3432 /* If we want to read from a failed device, then
3433 * we need to actually read every other device.
3437 /* Sometimes neither read-modify-write nor reconstruct-write
3438 * cycles can work. In those cases we read every block we
3439 * can. Then the parity-update is certain to have enough to
3441 * This can only be a problem when we need to write something,
3442 * and some device has failed. If either of those tests
3443 * fail we need look no further.
3445 if (!s
->failed
|| !s
->to_write
)
3448 if (test_bit(R5_Insync
, &dev
->flags
) &&
3449 !test_bit(STRIPE_PREREAD_ACTIVE
, &sh
->state
))
3450 /* Pre-reads at not permitted until after short delay
3451 * to gather multiple requests. However if this
3452 * device is no Insync, the block could only be be computed
3453 * and there is no need to delay that.
3457 for (i
= 0; i
< s
->failed
&& i
< 2; i
++) {
3458 if (fdev
[i
]->towrite
&&
3459 !test_bit(R5_UPTODATE
, &fdev
[i
]->flags
) &&
3460 !test_bit(R5_OVERWRITE
, &fdev
[i
]->flags
))
3461 /* If we have a partial write to a failed
3462 * device, then we will need to reconstruct
3463 * the content of that device, so all other
3464 * devices must be read.
3469 /* If we are forced to do a reconstruct-write, either because
3470 * the current RAID6 implementation only supports that, or
3471 * or because parity cannot be trusted and we are currently
3472 * recovering it, there is extra need to be careful.
3473 * If one of the devices that we would need to read, because
3474 * it is not being overwritten (and maybe not written at all)
3475 * is missing/faulty, then we need to read everything we can.
3477 if (sh
->raid_conf
->level
!= 6 &&
3478 sh
->sector
< sh
->raid_conf
->mddev
->recovery_cp
)
3479 /* reconstruct-write isn't being forced */
3481 for (i
= 0; i
< s
->failed
&& i
< 2; i
++) {
3482 if (s
->failed_num
[i
] != sh
->pd_idx
&&
3483 s
->failed_num
[i
] != sh
->qd_idx
&&
3484 !test_bit(R5_UPTODATE
, &fdev
[i
]->flags
) &&
3485 !test_bit(R5_OVERWRITE
, &fdev
[i
]->flags
))
3492 /* fetch_block - checks the given member device to see if its data needs
3493 * to be read or computed to satisfy a request.
3495 * Returns 1 when no more member devices need to be checked, otherwise returns
3496 * 0 to tell the loop in handle_stripe_fill to continue
3498 static int fetch_block(struct stripe_head
*sh
, struct stripe_head_state
*s
,
3499 int disk_idx
, int disks
)
3501 struct r5dev
*dev
= &sh
->dev
[disk_idx
];
3503 /* is the data in this block needed, and can we get it? */
3504 if (need_this_block(sh
, s
, disk_idx
, disks
)) {
3505 /* we would like to get this block, possibly by computing it,
3506 * otherwise read it if the backing disk is insync
3508 BUG_ON(test_bit(R5_Wantcompute
, &dev
->flags
));
3509 BUG_ON(test_bit(R5_Wantread
, &dev
->flags
));
3510 BUG_ON(sh
->batch_head
);
3511 if ((s
->uptodate
== disks
- 1) &&
3512 (s
->failed
&& (disk_idx
== s
->failed_num
[0] ||
3513 disk_idx
== s
->failed_num
[1]))) {
3514 /* have disk failed, and we're requested to fetch it;
3517 pr_debug("Computing stripe %llu block %d\n",
3518 (unsigned long long)sh
->sector
, disk_idx
);
3519 set_bit(STRIPE_COMPUTE_RUN
, &sh
->state
);
3520 set_bit(STRIPE_OP_COMPUTE_BLK
, &s
->ops_request
);
3521 set_bit(R5_Wantcompute
, &dev
->flags
);
3522 sh
->ops
.target
= disk_idx
;
3523 sh
->ops
.target2
= -1; /* no 2nd target */
3525 /* Careful: from this point on 'uptodate' is in the eye
3526 * of raid_run_ops which services 'compute' operations
3527 * before writes. R5_Wantcompute flags a block that will
3528 * be R5_UPTODATE by the time it is needed for a
3529 * subsequent operation.
3533 } else if (s
->uptodate
== disks
-2 && s
->failed
>= 2) {
3534 /* Computing 2-failure is *very* expensive; only
3535 * do it if failed >= 2
3538 for (other
= disks
; other
--; ) {
3539 if (other
== disk_idx
)
3541 if (!test_bit(R5_UPTODATE
,
3542 &sh
->dev
[other
].flags
))
3546 pr_debug("Computing stripe %llu blocks %d,%d\n",
3547 (unsigned long long)sh
->sector
,
3549 set_bit(STRIPE_COMPUTE_RUN
, &sh
->state
);
3550 set_bit(STRIPE_OP_COMPUTE_BLK
, &s
->ops_request
);
3551 set_bit(R5_Wantcompute
, &sh
->dev
[disk_idx
].flags
);
3552 set_bit(R5_Wantcompute
, &sh
->dev
[other
].flags
);
3553 sh
->ops
.target
= disk_idx
;
3554 sh
->ops
.target2
= other
;
3558 } else if (test_bit(R5_Insync
, &dev
->flags
)) {
3559 set_bit(R5_LOCKED
, &dev
->flags
);
3560 set_bit(R5_Wantread
, &dev
->flags
);
3562 pr_debug("Reading block %d (sync=%d)\n",
3563 disk_idx
, s
->syncing
);
3571 * handle_stripe_fill - read or compute data to satisfy pending requests.
3573 static void handle_stripe_fill(struct stripe_head
*sh
,
3574 struct stripe_head_state
*s
,
3579 /* look for blocks to read/compute, skip this if a compute
3580 * is already in flight, or if the stripe contents are in the
3581 * midst of changing due to a write
3583 if (!test_bit(STRIPE_COMPUTE_RUN
, &sh
->state
) && !sh
->check_state
&&
3584 !sh
->reconstruct_state
) {
3587 * For degraded stripe with data in journal, do not handle
3588 * read requests yet, instead, flush the stripe to raid
3589 * disks first, this avoids handling complex rmw of write
3590 * back cache (prexor with orig_page, and then xor with
3591 * page) in the read path
3593 if (s
->injournal
&& s
->failed
) {
3594 if (test_bit(STRIPE_R5C_CACHING
, &sh
->state
))
3595 r5c_make_stripe_write_out(sh
);
3599 for (i
= disks
; i
--; )
3600 if (fetch_block(sh
, s
, i
, disks
))
3604 set_bit(STRIPE_HANDLE
, &sh
->state
);
3607 static void break_stripe_batch_list(struct stripe_head
*head_sh
,
3608 unsigned long handle_flags
);
3609 /* handle_stripe_clean_event
3610 * any written block on an uptodate or failed drive can be returned.
3611 * Note that if we 'wrote' to a failed drive, it will be UPTODATE, but
3612 * never LOCKED, so we don't need to test 'failed' directly.
3614 static void handle_stripe_clean_event(struct r5conf
*conf
,
3615 struct stripe_head
*sh
, int disks
, struct bio_list
*return_bi
)
3619 int discard_pending
= 0;
3620 struct stripe_head
*head_sh
= sh
;
3621 bool do_endio
= false;
3623 for (i
= disks
; i
--; )
3624 if (sh
->dev
[i
].written
) {
3626 if (!test_bit(R5_LOCKED
, &dev
->flags
) &&
3627 (test_bit(R5_UPTODATE
, &dev
->flags
) ||
3628 test_bit(R5_Discard
, &dev
->flags
) ||
3629 test_bit(R5_SkipCopy
, &dev
->flags
))) {
3630 /* We can return any write requests */
3631 struct bio
*wbi
, *wbi2
;
3632 pr_debug("Return write for disc %d\n", i
);
3633 if (test_and_clear_bit(R5_Discard
, &dev
->flags
))
3634 clear_bit(R5_UPTODATE
, &dev
->flags
);
3635 if (test_and_clear_bit(R5_SkipCopy
, &dev
->flags
)) {
3636 WARN_ON(test_bit(R5_UPTODATE
, &dev
->flags
));
3641 dev
->page
= dev
->orig_page
;
3643 dev
->written
= NULL
;
3644 while (wbi
&& wbi
->bi_iter
.bi_sector
<
3645 dev
->sector
+ STRIPE_SECTORS
) {
3646 wbi2
= r5_next_bio(wbi
, dev
->sector
);
3647 if (!raid5_dec_bi_active_stripes(wbi
)) {
3648 md_write_end(conf
->mddev
);
3649 bio_list_add(return_bi
, wbi
);
3653 bitmap_endwrite(conf
->mddev
->bitmap
, sh
->sector
,
3655 !test_bit(STRIPE_DEGRADED
, &sh
->state
),
3657 if (head_sh
->batch_head
) {
3658 sh
= list_first_entry(&sh
->batch_list
,
3661 if (sh
!= head_sh
) {
3668 } else if (test_bit(R5_Discard
, &dev
->flags
))
3669 discard_pending
= 1;
3672 r5l_stripe_write_finished(sh
);
3674 if (!discard_pending
&&
3675 test_bit(R5_Discard
, &sh
->dev
[sh
->pd_idx
].flags
)) {
3677 clear_bit(R5_Discard
, &sh
->dev
[sh
->pd_idx
].flags
);
3678 clear_bit(R5_UPTODATE
, &sh
->dev
[sh
->pd_idx
].flags
);
3679 if (sh
->qd_idx
>= 0) {
3680 clear_bit(R5_Discard
, &sh
->dev
[sh
->qd_idx
].flags
);
3681 clear_bit(R5_UPTODATE
, &sh
->dev
[sh
->qd_idx
].flags
);
3683 /* now that discard is done we can proceed with any sync */
3684 clear_bit(STRIPE_DISCARD
, &sh
->state
);
3686 * SCSI discard will change some bio fields and the stripe has
3687 * no updated data, so remove it from hash list and the stripe
3688 * will be reinitialized
3691 hash
= sh
->hash_lock_index
;
3692 spin_lock_irq(conf
->hash_locks
+ hash
);
3694 spin_unlock_irq(conf
->hash_locks
+ hash
);
3695 if (head_sh
->batch_head
) {
3696 sh
= list_first_entry(&sh
->batch_list
,
3697 struct stripe_head
, batch_list
);
3703 if (test_bit(STRIPE_SYNC_REQUESTED
, &sh
->state
))
3704 set_bit(STRIPE_HANDLE
, &sh
->state
);
3708 if (test_and_clear_bit(STRIPE_FULL_WRITE
, &sh
->state
))
3709 if (atomic_dec_and_test(&conf
->pending_full_writes
))
3710 md_wakeup_thread(conf
->mddev
->thread
);
3712 if (head_sh
->batch_head
&& do_endio
)
3713 break_stripe_batch_list(head_sh
, STRIPE_EXPAND_SYNC_FLAGS
);
3717 * For RMW in write back cache, we need extra page in prexor to store the
3718 * old data. This page is stored in dev->orig_page.
3720 * This function checks whether we have data for prexor. The exact logic
3722 * R5_UPTODATE && (!R5_InJournal || R5_OrigPageUPTDODATE)
3724 static inline bool uptodate_for_rmw(struct r5dev
*dev
)
3726 return (test_bit(R5_UPTODATE
, &dev
->flags
)) &&
3727 (!test_bit(R5_InJournal
, &dev
->flags
) ||
3728 test_bit(R5_OrigPageUPTDODATE
, &dev
->flags
));
3731 static int handle_stripe_dirtying(struct r5conf
*conf
,
3732 struct stripe_head
*sh
,
3733 struct stripe_head_state
*s
,
3736 int rmw
= 0, rcw
= 0, i
;
3737 sector_t recovery_cp
= conf
->mddev
->recovery_cp
;
3739 /* Check whether resync is now happening or should start.
3740 * If yes, then the array is dirty (after unclean shutdown or
3741 * initial creation), so parity in some stripes might be inconsistent.
3742 * In this case, we need to always do reconstruct-write, to ensure
3743 * that in case of drive failure or read-error correction, we
3744 * generate correct data from the parity.
3746 if (conf
->rmw_level
== PARITY_DISABLE_RMW
||
3747 (recovery_cp
< MaxSector
&& sh
->sector
>= recovery_cp
&&
3749 /* Calculate the real rcw later - for now make it
3750 * look like rcw is cheaper
3753 pr_debug("force RCW rmw_level=%u, recovery_cp=%llu sh->sector=%llu\n",
3754 conf
->rmw_level
, (unsigned long long)recovery_cp
,
3755 (unsigned long long)sh
->sector
);
3756 } else for (i
= disks
; i
--; ) {
3757 /* would I have to read this buffer for read_modify_write */
3758 struct r5dev
*dev
= &sh
->dev
[i
];
3759 if (((dev
->towrite
&& !delay_towrite(conf
, dev
, s
)) ||
3760 i
== sh
->pd_idx
|| i
== sh
->qd_idx
||
3761 test_bit(R5_InJournal
, &dev
->flags
)) &&
3762 !test_bit(R5_LOCKED
, &dev
->flags
) &&
3763 !(uptodate_for_rmw(dev
) ||
3764 test_bit(R5_Wantcompute
, &dev
->flags
))) {
3765 if (test_bit(R5_Insync
, &dev
->flags
))
3768 rmw
+= 2*disks
; /* cannot read it */
3770 /* Would I have to read this buffer for reconstruct_write */
3771 if (!test_bit(R5_OVERWRITE
, &dev
->flags
) &&
3772 i
!= sh
->pd_idx
&& i
!= sh
->qd_idx
&&
3773 !test_bit(R5_LOCKED
, &dev
->flags
) &&
3774 !(test_bit(R5_UPTODATE
, &dev
->flags
) ||
3775 test_bit(R5_Wantcompute
, &dev
->flags
))) {
3776 if (test_bit(R5_Insync
, &dev
->flags
))
3783 pr_debug("for sector %llu state 0x%lx, rmw=%d rcw=%d\n",
3784 (unsigned long long)sh
->sector
, sh
->state
, rmw
, rcw
);
3785 set_bit(STRIPE_HANDLE
, &sh
->state
);
3786 if ((rmw
< rcw
|| (rmw
== rcw
&& conf
->rmw_level
== PARITY_PREFER_RMW
)) && rmw
> 0) {
3787 /* prefer read-modify-write, but need to get some data */
3788 if (conf
->mddev
->queue
)
3789 blk_add_trace_msg(conf
->mddev
->queue
,
3790 "raid5 rmw %llu %d",
3791 (unsigned long long)sh
->sector
, rmw
);
3792 for (i
= disks
; i
--; ) {
3793 struct r5dev
*dev
= &sh
->dev
[i
];
3794 if (test_bit(R5_InJournal
, &dev
->flags
) &&
3795 dev
->page
== dev
->orig_page
&&
3796 !test_bit(R5_LOCKED
, &sh
->dev
[sh
->pd_idx
].flags
)) {
3797 /* alloc page for prexor */
3798 struct page
*p
= alloc_page(GFP_NOIO
);
3806 * alloc_page() failed, try use
3807 * disk_info->extra_page
3809 if (!test_and_set_bit(R5C_EXTRA_PAGE_IN_USE
,
3810 &conf
->cache_state
)) {
3811 r5c_use_extra_page(sh
);
3815 /* extra_page in use, add to delayed_list */
3816 set_bit(STRIPE_DELAYED
, &sh
->state
);
3817 s
->waiting_extra_page
= 1;
3822 for (i
= disks
; i
--; ) {
3823 struct r5dev
*dev
= &sh
->dev
[i
];
3824 if (((dev
->towrite
&& !delay_towrite(conf
, dev
, s
)) ||
3825 i
== sh
->pd_idx
|| i
== sh
->qd_idx
||
3826 test_bit(R5_InJournal
, &dev
->flags
)) &&
3827 !test_bit(R5_LOCKED
, &dev
->flags
) &&
3828 !(uptodate_for_rmw(dev
) ||
3829 test_bit(R5_Wantcompute
, &dev
->flags
)) &&
3830 test_bit(R5_Insync
, &dev
->flags
)) {
3831 if (test_bit(STRIPE_PREREAD_ACTIVE
,
3833 pr_debug("Read_old block %d for r-m-w\n",
3835 set_bit(R5_LOCKED
, &dev
->flags
);
3836 set_bit(R5_Wantread
, &dev
->flags
);
3839 set_bit(STRIPE_DELAYED
, &sh
->state
);
3840 set_bit(STRIPE_HANDLE
, &sh
->state
);
3845 if ((rcw
< rmw
|| (rcw
== rmw
&& conf
->rmw_level
!= PARITY_PREFER_RMW
)) && rcw
> 0) {
3846 /* want reconstruct write, but need to get some data */
3849 for (i
= disks
; i
--; ) {
3850 struct r5dev
*dev
= &sh
->dev
[i
];
3851 if (!test_bit(R5_OVERWRITE
, &dev
->flags
) &&
3852 i
!= sh
->pd_idx
&& i
!= sh
->qd_idx
&&
3853 !test_bit(R5_LOCKED
, &dev
->flags
) &&
3854 !(test_bit(R5_UPTODATE
, &dev
->flags
) ||
3855 test_bit(R5_Wantcompute
, &dev
->flags
))) {
3857 if (test_bit(R5_Insync
, &dev
->flags
) &&
3858 test_bit(STRIPE_PREREAD_ACTIVE
,
3860 pr_debug("Read_old block "
3861 "%d for Reconstruct\n", i
);
3862 set_bit(R5_LOCKED
, &dev
->flags
);
3863 set_bit(R5_Wantread
, &dev
->flags
);
3867 set_bit(STRIPE_DELAYED
, &sh
->state
);
3868 set_bit(STRIPE_HANDLE
, &sh
->state
);
3872 if (rcw
&& conf
->mddev
->queue
)
3873 blk_add_trace_msg(conf
->mddev
->queue
, "raid5 rcw %llu %d %d %d",
3874 (unsigned long long)sh
->sector
,
3875 rcw
, qread
, test_bit(STRIPE_DELAYED
, &sh
->state
));
3878 if (rcw
> disks
&& rmw
> disks
&&
3879 !test_bit(STRIPE_PREREAD_ACTIVE
, &sh
->state
))
3880 set_bit(STRIPE_DELAYED
, &sh
->state
);
3882 /* now if nothing is locked, and if we have enough data,
3883 * we can start a write request
3885 /* since handle_stripe can be called at any time we need to handle the
3886 * case where a compute block operation has been submitted and then a
3887 * subsequent call wants to start a write request. raid_run_ops only
3888 * handles the case where compute block and reconstruct are requested
3889 * simultaneously. If this is not the case then new writes need to be
3890 * held off until the compute completes.
3892 if ((s
->req_compute
|| !test_bit(STRIPE_COMPUTE_RUN
, &sh
->state
)) &&
3893 (s
->locked
== 0 && (rcw
== 0 || rmw
== 0) &&
3894 !test_bit(STRIPE_BIT_DELAY
, &sh
->state
)))
3895 schedule_reconstruction(sh
, s
, rcw
== 0, 0);
3899 static void handle_parity_checks5(struct r5conf
*conf
, struct stripe_head
*sh
,
3900 struct stripe_head_state
*s
, int disks
)
3902 struct r5dev
*dev
= NULL
;
3904 BUG_ON(sh
->batch_head
);
3905 set_bit(STRIPE_HANDLE
, &sh
->state
);
3907 switch (sh
->check_state
) {
3908 case check_state_idle
:
3909 /* start a new check operation if there are no failures */
3910 if (s
->failed
== 0) {
3911 BUG_ON(s
->uptodate
!= disks
);
3912 sh
->check_state
= check_state_run
;
3913 set_bit(STRIPE_OP_CHECK
, &s
->ops_request
);
3914 clear_bit(R5_UPTODATE
, &sh
->dev
[sh
->pd_idx
].flags
);
3918 dev
= &sh
->dev
[s
->failed_num
[0]];
3920 case check_state_compute_result
:
3921 sh
->check_state
= check_state_idle
;
3923 dev
= &sh
->dev
[sh
->pd_idx
];
3925 /* check that a write has not made the stripe insync */
3926 if (test_bit(STRIPE_INSYNC
, &sh
->state
))
3929 /* either failed parity check, or recovery is happening */
3930 BUG_ON(!test_bit(R5_UPTODATE
, &dev
->flags
));
3931 BUG_ON(s
->uptodate
!= disks
);
3933 set_bit(R5_LOCKED
, &dev
->flags
);
3935 set_bit(R5_Wantwrite
, &dev
->flags
);
3937 clear_bit(STRIPE_DEGRADED
, &sh
->state
);
3938 set_bit(STRIPE_INSYNC
, &sh
->state
);
3940 case check_state_run
:
3941 break; /* we will be called again upon completion */
3942 case check_state_check_result
:
3943 sh
->check_state
= check_state_idle
;
3945 /* if a failure occurred during the check operation, leave
3946 * STRIPE_INSYNC not set and let the stripe be handled again
3951 /* handle a successful check operation, if parity is correct
3952 * we are done. Otherwise update the mismatch count and repair
3953 * parity if !MD_RECOVERY_CHECK
3955 if ((sh
->ops
.zero_sum_result
& SUM_CHECK_P_RESULT
) == 0)
3956 /* parity is correct (on disc,
3957 * not in buffer any more)
3959 set_bit(STRIPE_INSYNC
, &sh
->state
);
3961 atomic64_add(STRIPE_SECTORS
, &conf
->mddev
->resync_mismatches
);
3962 if (test_bit(MD_RECOVERY_CHECK
, &conf
->mddev
->recovery
))
3963 /* don't try to repair!! */
3964 set_bit(STRIPE_INSYNC
, &sh
->state
);
3966 sh
->check_state
= check_state_compute_run
;
3967 set_bit(STRIPE_COMPUTE_RUN
, &sh
->state
);
3968 set_bit(STRIPE_OP_COMPUTE_BLK
, &s
->ops_request
);
3969 set_bit(R5_Wantcompute
,
3970 &sh
->dev
[sh
->pd_idx
].flags
);
3971 sh
->ops
.target
= sh
->pd_idx
;
3972 sh
->ops
.target2
= -1;
3977 case check_state_compute_run
:
3980 pr_err("%s: unknown check_state: %d sector: %llu\n",
3981 __func__
, sh
->check_state
,
3982 (unsigned long long) sh
->sector
);
3987 static void handle_parity_checks6(struct r5conf
*conf
, struct stripe_head
*sh
,
3988 struct stripe_head_state
*s
,
3991 int pd_idx
= sh
->pd_idx
;
3992 int qd_idx
= sh
->qd_idx
;
3995 BUG_ON(sh
->batch_head
);
3996 set_bit(STRIPE_HANDLE
, &sh
->state
);
3998 BUG_ON(s
->failed
> 2);
4000 /* Want to check and possibly repair P and Q.
4001 * However there could be one 'failed' device, in which
4002 * case we can only check one of them, possibly using the
4003 * other to generate missing data
4006 switch (sh
->check_state
) {
4007 case check_state_idle
:
4008 /* start a new check operation if there are < 2 failures */
4009 if (s
->failed
== s
->q_failed
) {
4010 /* The only possible failed device holds Q, so it
4011 * makes sense to check P (If anything else were failed,
4012 * we would have used P to recreate it).
4014 sh
->check_state
= check_state_run
;
4016 if (!s
->q_failed
&& s
->failed
< 2) {
4017 /* Q is not failed, and we didn't use it to generate
4018 * anything, so it makes sense to check it
4020 if (sh
->check_state
== check_state_run
)
4021 sh
->check_state
= check_state_run_pq
;
4023 sh
->check_state
= check_state_run_q
;
4026 /* discard potentially stale zero_sum_result */
4027 sh
->ops
.zero_sum_result
= 0;
4029 if (sh
->check_state
== check_state_run
) {
4030 /* async_xor_zero_sum destroys the contents of P */
4031 clear_bit(R5_UPTODATE
, &sh
->dev
[pd_idx
].flags
);
4034 if (sh
->check_state
>= check_state_run
&&
4035 sh
->check_state
<= check_state_run_pq
) {
4036 /* async_syndrome_zero_sum preserves P and Q, so
4037 * no need to mark them !uptodate here
4039 set_bit(STRIPE_OP_CHECK
, &s
->ops_request
);
4043 /* we have 2-disk failure */
4044 BUG_ON(s
->failed
!= 2);
4046 case check_state_compute_result
:
4047 sh
->check_state
= check_state_idle
;
4049 /* check that a write has not made the stripe insync */
4050 if (test_bit(STRIPE_INSYNC
, &sh
->state
))
4053 /* now write out any block on a failed drive,
4054 * or P or Q if they were recomputed
4056 BUG_ON(s
->uptodate
< disks
- 1); /* We don't need Q to recover */
4057 if (s
->failed
== 2) {
4058 dev
= &sh
->dev
[s
->failed_num
[1]];
4060 set_bit(R5_LOCKED
, &dev
->flags
);
4061 set_bit(R5_Wantwrite
, &dev
->flags
);
4063 if (s
->failed
>= 1) {
4064 dev
= &sh
->dev
[s
->failed_num
[0]];
4066 set_bit(R5_LOCKED
, &dev
->flags
);
4067 set_bit(R5_Wantwrite
, &dev
->flags
);
4069 if (sh
->ops
.zero_sum_result
& SUM_CHECK_P_RESULT
) {
4070 dev
= &sh
->dev
[pd_idx
];
4072 set_bit(R5_LOCKED
, &dev
->flags
);
4073 set_bit(R5_Wantwrite
, &dev
->flags
);
4075 if (sh
->ops
.zero_sum_result
& SUM_CHECK_Q_RESULT
) {
4076 dev
= &sh
->dev
[qd_idx
];
4078 set_bit(R5_LOCKED
, &dev
->flags
);
4079 set_bit(R5_Wantwrite
, &dev
->flags
);
4081 clear_bit(STRIPE_DEGRADED
, &sh
->state
);
4083 set_bit(STRIPE_INSYNC
, &sh
->state
);
4085 case check_state_run
:
4086 case check_state_run_q
:
4087 case check_state_run_pq
:
4088 break; /* we will be called again upon completion */
4089 case check_state_check_result
:
4090 sh
->check_state
= check_state_idle
;
4092 /* handle a successful check operation, if parity is correct
4093 * we are done. Otherwise update the mismatch count and repair
4094 * parity if !MD_RECOVERY_CHECK
4096 if (sh
->ops
.zero_sum_result
== 0) {
4097 /* both parities are correct */
4099 set_bit(STRIPE_INSYNC
, &sh
->state
);
4101 /* in contrast to the raid5 case we can validate
4102 * parity, but still have a failure to write
4105 sh
->check_state
= check_state_compute_result
;
4106 /* Returning at this point means that we may go
4107 * off and bring p and/or q uptodate again so
4108 * we make sure to check zero_sum_result again
4109 * to verify if p or q need writeback
4113 atomic64_add(STRIPE_SECTORS
, &conf
->mddev
->resync_mismatches
);
4114 if (test_bit(MD_RECOVERY_CHECK
, &conf
->mddev
->recovery
))
4115 /* don't try to repair!! */
4116 set_bit(STRIPE_INSYNC
, &sh
->state
);
4118 int *target
= &sh
->ops
.target
;
4120 sh
->ops
.target
= -1;
4121 sh
->ops
.target2
= -1;
4122 sh
->check_state
= check_state_compute_run
;
4123 set_bit(STRIPE_COMPUTE_RUN
, &sh
->state
);
4124 set_bit(STRIPE_OP_COMPUTE_BLK
, &s
->ops_request
);
4125 if (sh
->ops
.zero_sum_result
& SUM_CHECK_P_RESULT
) {
4126 set_bit(R5_Wantcompute
,
4127 &sh
->dev
[pd_idx
].flags
);
4129 target
= &sh
->ops
.target2
;
4132 if (sh
->ops
.zero_sum_result
& SUM_CHECK_Q_RESULT
) {
4133 set_bit(R5_Wantcompute
,
4134 &sh
->dev
[qd_idx
].flags
);
4141 case check_state_compute_run
:
4144 pr_warn("%s: unknown check_state: %d sector: %llu\n",
4145 __func__
, sh
->check_state
,
4146 (unsigned long long) sh
->sector
);
4151 static void handle_stripe_expansion(struct r5conf
*conf
, struct stripe_head
*sh
)
4155 /* We have read all the blocks in this stripe and now we need to
4156 * copy some of them into a target stripe for expand.
4158 struct dma_async_tx_descriptor
*tx
= NULL
;
4159 BUG_ON(sh
->batch_head
);
4160 clear_bit(STRIPE_EXPAND_SOURCE
, &sh
->state
);
4161 for (i
= 0; i
< sh
->disks
; i
++)
4162 if (i
!= sh
->pd_idx
&& i
!= sh
->qd_idx
) {
4164 struct stripe_head
*sh2
;
4165 struct async_submit_ctl submit
;
4167 sector_t bn
= raid5_compute_blocknr(sh
, i
, 1);
4168 sector_t s
= raid5_compute_sector(conf
, bn
, 0,
4170 sh2
= raid5_get_active_stripe(conf
, s
, 0, 1, 1);
4172 /* so far only the early blocks of this stripe
4173 * have been requested. When later blocks
4174 * get requested, we will try again
4177 if (!test_bit(STRIPE_EXPANDING
, &sh2
->state
) ||
4178 test_bit(R5_Expanded
, &sh2
->dev
[dd_idx
].flags
)) {
4179 /* must have already done this block */
4180 raid5_release_stripe(sh2
);
4184 /* place all the copies on one channel */
4185 init_async_submit(&submit
, 0, tx
, NULL
, NULL
, NULL
);
4186 tx
= async_memcpy(sh2
->dev
[dd_idx
].page
,
4187 sh
->dev
[i
].page
, 0, 0, STRIPE_SIZE
,
4190 set_bit(R5_Expanded
, &sh2
->dev
[dd_idx
].flags
);
4191 set_bit(R5_UPTODATE
, &sh2
->dev
[dd_idx
].flags
);
4192 for (j
= 0; j
< conf
->raid_disks
; j
++)
4193 if (j
!= sh2
->pd_idx
&&
4195 !test_bit(R5_Expanded
, &sh2
->dev
[j
].flags
))
4197 if (j
== conf
->raid_disks
) {
4198 set_bit(STRIPE_EXPAND_READY
, &sh2
->state
);
4199 set_bit(STRIPE_HANDLE
, &sh2
->state
);
4201 raid5_release_stripe(sh2
);
4204 /* done submitting copies, wait for them to complete */
4205 async_tx_quiesce(&tx
);
4209 * handle_stripe - do things to a stripe.
4211 * We lock the stripe by setting STRIPE_ACTIVE and then examine the
4212 * state of various bits to see what needs to be done.
4214 * return some read requests which now have data
4215 * return some write requests which are safely on storage
4216 * schedule a read on some buffers
4217 * schedule a write of some buffers
4218 * return confirmation of parity correctness
4222 static void analyse_stripe(struct stripe_head
*sh
, struct stripe_head_state
*s
)
4224 struct r5conf
*conf
= sh
->raid_conf
;
4225 int disks
= sh
->disks
;
4228 int do_recovery
= 0;
4230 memset(s
, 0, sizeof(*s
));
4232 s
->expanding
= test_bit(STRIPE_EXPAND_SOURCE
, &sh
->state
) && !sh
->batch_head
;
4233 s
->expanded
= test_bit(STRIPE_EXPAND_READY
, &sh
->state
) && !sh
->batch_head
;
4234 s
->failed_num
[0] = -1;
4235 s
->failed_num
[1] = -1;
4236 s
->log_failed
= r5l_log_disk_error(conf
);
4238 /* Now to look around and see what can be done */
4240 for (i
=disks
; i
--; ) {
4241 struct md_rdev
*rdev
;
4248 pr_debug("check %d: state 0x%lx read %p write %p written %p\n",
4250 dev
->toread
, dev
->towrite
, dev
->written
);
4251 /* maybe we can reply to a read
4253 * new wantfill requests are only permitted while
4254 * ops_complete_biofill is guaranteed to be inactive
4256 if (test_bit(R5_UPTODATE
, &dev
->flags
) && dev
->toread
&&
4257 !test_bit(STRIPE_BIOFILL_RUN
, &sh
->state
))
4258 set_bit(R5_Wantfill
, &dev
->flags
);
4260 /* now count some things */
4261 if (test_bit(R5_LOCKED
, &dev
->flags
))
4263 if (test_bit(R5_UPTODATE
, &dev
->flags
))
4265 if (test_bit(R5_Wantcompute
, &dev
->flags
)) {
4267 BUG_ON(s
->compute
> 2);
4270 if (test_bit(R5_Wantfill
, &dev
->flags
))
4272 else if (dev
->toread
)
4276 if (!test_bit(R5_OVERWRITE
, &dev
->flags
))
4281 /* Prefer to use the replacement for reads, but only
4282 * if it is recovered enough and has no bad blocks.
4284 rdev
= rcu_dereference(conf
->disks
[i
].replacement
);
4285 if (rdev
&& !test_bit(Faulty
, &rdev
->flags
) &&
4286 rdev
->recovery_offset
>= sh
->sector
+ STRIPE_SECTORS
&&
4287 !is_badblock(rdev
, sh
->sector
, STRIPE_SECTORS
,
4288 &first_bad
, &bad_sectors
))
4289 set_bit(R5_ReadRepl
, &dev
->flags
);
4291 if (rdev
&& !test_bit(Faulty
, &rdev
->flags
))
4292 set_bit(R5_NeedReplace
, &dev
->flags
);
4294 clear_bit(R5_NeedReplace
, &dev
->flags
);
4295 rdev
= rcu_dereference(conf
->disks
[i
].rdev
);
4296 clear_bit(R5_ReadRepl
, &dev
->flags
);
4298 if (rdev
&& test_bit(Faulty
, &rdev
->flags
))
4301 is_bad
= is_badblock(rdev
, sh
->sector
, STRIPE_SECTORS
,
4302 &first_bad
, &bad_sectors
);
4303 if (s
->blocked_rdev
== NULL
4304 && (test_bit(Blocked
, &rdev
->flags
)
4307 set_bit(BlockedBadBlocks
,
4309 s
->blocked_rdev
= rdev
;
4310 atomic_inc(&rdev
->nr_pending
);
4313 clear_bit(R5_Insync
, &dev
->flags
);
4317 /* also not in-sync */
4318 if (!test_bit(WriteErrorSeen
, &rdev
->flags
) &&
4319 test_bit(R5_UPTODATE
, &dev
->flags
)) {
4320 /* treat as in-sync, but with a read error
4321 * which we can now try to correct
4323 set_bit(R5_Insync
, &dev
->flags
);
4324 set_bit(R5_ReadError
, &dev
->flags
);
4326 } else if (test_bit(In_sync
, &rdev
->flags
))
4327 set_bit(R5_Insync
, &dev
->flags
);
4328 else if (sh
->sector
+ STRIPE_SECTORS
<= rdev
->recovery_offset
)
4329 /* in sync if before recovery_offset */
4330 set_bit(R5_Insync
, &dev
->flags
);
4331 else if (test_bit(R5_UPTODATE
, &dev
->flags
) &&
4332 test_bit(R5_Expanded
, &dev
->flags
))
4333 /* If we've reshaped into here, we assume it is Insync.
4334 * We will shortly update recovery_offset to make
4337 set_bit(R5_Insync
, &dev
->flags
);
4339 if (test_bit(R5_WriteError
, &dev
->flags
)) {
4340 /* This flag does not apply to '.replacement'
4341 * only to .rdev, so make sure to check that*/
4342 struct md_rdev
*rdev2
= rcu_dereference(
4343 conf
->disks
[i
].rdev
);
4345 clear_bit(R5_Insync
, &dev
->flags
);
4346 if (rdev2
&& !test_bit(Faulty
, &rdev2
->flags
)) {
4347 s
->handle_bad_blocks
= 1;
4348 atomic_inc(&rdev2
->nr_pending
);
4350 clear_bit(R5_WriteError
, &dev
->flags
);
4352 if (test_bit(R5_MadeGood
, &dev
->flags
)) {
4353 /* This flag does not apply to '.replacement'
4354 * only to .rdev, so make sure to check that*/
4355 struct md_rdev
*rdev2
= rcu_dereference(
4356 conf
->disks
[i
].rdev
);
4357 if (rdev2
&& !test_bit(Faulty
, &rdev2
->flags
)) {
4358 s
->handle_bad_blocks
= 1;
4359 atomic_inc(&rdev2
->nr_pending
);
4361 clear_bit(R5_MadeGood
, &dev
->flags
);
4363 if (test_bit(R5_MadeGoodRepl
, &dev
->flags
)) {
4364 struct md_rdev
*rdev2
= rcu_dereference(
4365 conf
->disks
[i
].replacement
);
4366 if (rdev2
&& !test_bit(Faulty
, &rdev2
->flags
)) {
4367 s
->handle_bad_blocks
= 1;
4368 atomic_inc(&rdev2
->nr_pending
);
4370 clear_bit(R5_MadeGoodRepl
, &dev
->flags
);
4372 if (!test_bit(R5_Insync
, &dev
->flags
)) {
4373 /* The ReadError flag will just be confusing now */
4374 clear_bit(R5_ReadError
, &dev
->flags
);
4375 clear_bit(R5_ReWrite
, &dev
->flags
);
4377 if (test_bit(R5_ReadError
, &dev
->flags
))
4378 clear_bit(R5_Insync
, &dev
->flags
);
4379 if (!test_bit(R5_Insync
, &dev
->flags
)) {
4381 s
->failed_num
[s
->failed
] = i
;
4383 if (rdev
&& !test_bit(Faulty
, &rdev
->flags
))
4387 if (test_bit(R5_InJournal
, &dev
->flags
))
4389 if (test_bit(R5_InJournal
, &dev
->flags
) && dev
->written
)
4392 if (test_bit(STRIPE_SYNCING
, &sh
->state
)) {
4393 /* If there is a failed device being replaced,
4394 * we must be recovering.
4395 * else if we are after recovery_cp, we must be syncing
4396 * else if MD_RECOVERY_REQUESTED is set, we also are syncing.
4397 * else we can only be replacing
4398 * sync and recovery both need to read all devices, and so
4399 * use the same flag.
4402 sh
->sector
>= conf
->mddev
->recovery_cp
||
4403 test_bit(MD_RECOVERY_REQUESTED
, &(conf
->mddev
->recovery
)))
4411 static int clear_batch_ready(struct stripe_head
*sh
)
4413 /* Return '1' if this is a member of batch, or
4414 * '0' if it is a lone stripe or a head which can now be
4417 struct stripe_head
*tmp
;
4418 if (!test_and_clear_bit(STRIPE_BATCH_READY
, &sh
->state
))
4419 return (sh
->batch_head
&& sh
->batch_head
!= sh
);
4420 spin_lock(&sh
->stripe_lock
);
4421 if (!sh
->batch_head
) {
4422 spin_unlock(&sh
->stripe_lock
);
4427 * this stripe could be added to a batch list before we check
4428 * BATCH_READY, skips it
4430 if (sh
->batch_head
!= sh
) {
4431 spin_unlock(&sh
->stripe_lock
);
4434 spin_lock(&sh
->batch_lock
);
4435 list_for_each_entry(tmp
, &sh
->batch_list
, batch_list
)
4436 clear_bit(STRIPE_BATCH_READY
, &tmp
->state
);
4437 spin_unlock(&sh
->batch_lock
);
4438 spin_unlock(&sh
->stripe_lock
);
4441 * BATCH_READY is cleared, no new stripes can be added.
4442 * batch_list can be accessed without lock
4447 static void break_stripe_batch_list(struct stripe_head
*head_sh
,
4448 unsigned long handle_flags
)
4450 struct stripe_head
*sh
, *next
;
4454 list_for_each_entry_safe(sh
, next
, &head_sh
->batch_list
, batch_list
) {
4456 list_del_init(&sh
->batch_list
);
4458 WARN_ONCE(sh
->state
& ((1 << STRIPE_ACTIVE
) |
4459 (1 << STRIPE_SYNCING
) |
4460 (1 << STRIPE_REPLACED
) |
4461 (1 << STRIPE_DELAYED
) |
4462 (1 << STRIPE_BIT_DELAY
) |
4463 (1 << STRIPE_FULL_WRITE
) |
4464 (1 << STRIPE_BIOFILL_RUN
) |
4465 (1 << STRIPE_COMPUTE_RUN
) |
4466 (1 << STRIPE_OPS_REQ_PENDING
) |
4467 (1 << STRIPE_DISCARD
) |
4468 (1 << STRIPE_BATCH_READY
) |
4469 (1 << STRIPE_BATCH_ERR
) |
4470 (1 << STRIPE_BITMAP_PENDING
)),
4471 "stripe state: %lx\n", sh
->state
);
4472 WARN_ONCE(head_sh
->state
& ((1 << STRIPE_DISCARD
) |
4473 (1 << STRIPE_REPLACED
)),
4474 "head stripe state: %lx\n", head_sh
->state
);
4476 set_mask_bits(&sh
->state
, ~(STRIPE_EXPAND_SYNC_FLAGS
|
4477 (1 << STRIPE_PREREAD_ACTIVE
) |
4478 (1 << STRIPE_DEGRADED
)),
4479 head_sh
->state
& (1 << STRIPE_INSYNC
));
4481 sh
->check_state
= head_sh
->check_state
;
4482 sh
->reconstruct_state
= head_sh
->reconstruct_state
;
4483 for (i
= 0; i
< sh
->disks
; i
++) {
4484 if (test_and_clear_bit(R5_Overlap
, &sh
->dev
[i
].flags
))
4486 sh
->dev
[i
].flags
= head_sh
->dev
[i
].flags
&
4487 (~((1 << R5_WriteError
) | (1 << R5_Overlap
)));
4489 spin_lock_irq(&sh
->stripe_lock
);
4490 sh
->batch_head
= NULL
;
4491 spin_unlock_irq(&sh
->stripe_lock
);
4492 if (handle_flags
== 0 ||
4493 sh
->state
& handle_flags
)
4494 set_bit(STRIPE_HANDLE
, &sh
->state
);
4495 raid5_release_stripe(sh
);
4497 spin_lock_irq(&head_sh
->stripe_lock
);
4498 head_sh
->batch_head
= NULL
;
4499 spin_unlock_irq(&head_sh
->stripe_lock
);
4500 for (i
= 0; i
< head_sh
->disks
; i
++)
4501 if (test_and_clear_bit(R5_Overlap
, &head_sh
->dev
[i
].flags
))
4503 if (head_sh
->state
& handle_flags
)
4504 set_bit(STRIPE_HANDLE
, &head_sh
->state
);
4507 wake_up(&head_sh
->raid_conf
->wait_for_overlap
);
4510 static void handle_stripe(struct stripe_head
*sh
)
4512 struct stripe_head_state s
;
4513 struct r5conf
*conf
= sh
->raid_conf
;
4516 int disks
= sh
->disks
;
4517 struct r5dev
*pdev
, *qdev
;
4519 clear_bit(STRIPE_HANDLE
, &sh
->state
);
4520 if (test_and_set_bit_lock(STRIPE_ACTIVE
, &sh
->state
)) {
4521 /* already being handled, ensure it gets handled
4522 * again when current action finishes */
4523 set_bit(STRIPE_HANDLE
, &sh
->state
);
4527 if (clear_batch_ready(sh
) ) {
4528 clear_bit_unlock(STRIPE_ACTIVE
, &sh
->state
);
4532 if (test_and_clear_bit(STRIPE_BATCH_ERR
, &sh
->state
))
4533 break_stripe_batch_list(sh
, 0);
4535 if (test_bit(STRIPE_SYNC_REQUESTED
, &sh
->state
) && !sh
->batch_head
) {
4536 spin_lock(&sh
->stripe_lock
);
4537 /* Cannot process 'sync' concurrently with 'discard' */
4538 if (!test_bit(STRIPE_DISCARD
, &sh
->state
) &&
4539 test_and_clear_bit(STRIPE_SYNC_REQUESTED
, &sh
->state
)) {
4540 set_bit(STRIPE_SYNCING
, &sh
->state
);
4541 clear_bit(STRIPE_INSYNC
, &sh
->state
);
4542 clear_bit(STRIPE_REPLACED
, &sh
->state
);
4544 spin_unlock(&sh
->stripe_lock
);
4546 clear_bit(STRIPE_DELAYED
, &sh
->state
);
4548 pr_debug("handling stripe %llu, state=%#lx cnt=%d, "
4549 "pd_idx=%d, qd_idx=%d\n, check:%d, reconstruct:%d\n",
4550 (unsigned long long)sh
->sector
, sh
->state
,
4551 atomic_read(&sh
->count
), sh
->pd_idx
, sh
->qd_idx
,
4552 sh
->check_state
, sh
->reconstruct_state
);
4554 analyse_stripe(sh
, &s
);
4556 if (test_bit(STRIPE_LOG_TRAPPED
, &sh
->state
))
4559 if (s
.handle_bad_blocks
) {
4560 set_bit(STRIPE_HANDLE
, &sh
->state
);
4564 if (unlikely(s
.blocked_rdev
)) {
4565 if (s
.syncing
|| s
.expanding
|| s
.expanded
||
4566 s
.replacing
|| s
.to_write
|| s
.written
) {
4567 set_bit(STRIPE_HANDLE
, &sh
->state
);
4570 /* There is nothing for the blocked_rdev to block */
4571 rdev_dec_pending(s
.blocked_rdev
, conf
->mddev
);
4572 s
.blocked_rdev
= NULL
;
4575 if (s
.to_fill
&& !test_bit(STRIPE_BIOFILL_RUN
, &sh
->state
)) {
4576 set_bit(STRIPE_OP_BIOFILL
, &s
.ops_request
);
4577 set_bit(STRIPE_BIOFILL_RUN
, &sh
->state
);
4580 pr_debug("locked=%d uptodate=%d to_read=%d"
4581 " to_write=%d failed=%d failed_num=%d,%d\n",
4582 s
.locked
, s
.uptodate
, s
.to_read
, s
.to_write
, s
.failed
,
4583 s
.failed_num
[0], s
.failed_num
[1]);
4584 /* check if the array has lost more than max_degraded devices and,
4585 * if so, some requests might need to be failed.
4587 if (s
.failed
> conf
->max_degraded
|| s
.log_failed
) {
4588 sh
->check_state
= 0;
4589 sh
->reconstruct_state
= 0;
4590 break_stripe_batch_list(sh
, 0);
4591 if (s
.to_read
+s
.to_write
+s
.written
)
4592 handle_failed_stripe(conf
, sh
, &s
, disks
, &s
.return_bi
);
4593 if (s
.syncing
+ s
.replacing
)
4594 handle_failed_sync(conf
, sh
, &s
);
4597 /* Now we check to see if any write operations have recently
4601 if (sh
->reconstruct_state
== reconstruct_state_prexor_drain_result
)
4603 if (sh
->reconstruct_state
== reconstruct_state_drain_result
||
4604 sh
->reconstruct_state
== reconstruct_state_prexor_drain_result
) {
4605 sh
->reconstruct_state
= reconstruct_state_idle
;
4607 /* All the 'written' buffers and the parity block are ready to
4608 * be written back to disk
4610 BUG_ON(!test_bit(R5_UPTODATE
, &sh
->dev
[sh
->pd_idx
].flags
) &&
4611 !test_bit(R5_Discard
, &sh
->dev
[sh
->pd_idx
].flags
));
4612 BUG_ON(sh
->qd_idx
>= 0 &&
4613 !test_bit(R5_UPTODATE
, &sh
->dev
[sh
->qd_idx
].flags
) &&
4614 !test_bit(R5_Discard
, &sh
->dev
[sh
->qd_idx
].flags
));
4615 for (i
= disks
; i
--; ) {
4616 struct r5dev
*dev
= &sh
->dev
[i
];
4617 if (test_bit(R5_LOCKED
, &dev
->flags
) &&
4618 (i
== sh
->pd_idx
|| i
== sh
->qd_idx
||
4619 dev
->written
|| test_bit(R5_InJournal
,
4621 pr_debug("Writing block %d\n", i
);
4622 set_bit(R5_Wantwrite
, &dev
->flags
);
4627 if (!test_bit(R5_Insync
, &dev
->flags
) ||
4628 ((i
== sh
->pd_idx
|| i
== sh
->qd_idx
) &&
4630 set_bit(STRIPE_INSYNC
, &sh
->state
);
4633 if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE
, &sh
->state
))
4634 s
.dec_preread_active
= 1;
4638 * might be able to return some write requests if the parity blocks
4639 * are safe, or on a failed drive
4641 pdev
= &sh
->dev
[sh
->pd_idx
];
4642 s
.p_failed
= (s
.failed
>= 1 && s
.failed_num
[0] == sh
->pd_idx
)
4643 || (s
.failed
>= 2 && s
.failed_num
[1] == sh
->pd_idx
);
4644 qdev
= &sh
->dev
[sh
->qd_idx
];
4645 s
.q_failed
= (s
.failed
>= 1 && s
.failed_num
[0] == sh
->qd_idx
)
4646 || (s
.failed
>= 2 && s
.failed_num
[1] == sh
->qd_idx
)
4650 (s
.p_failed
|| ((test_bit(R5_Insync
, &pdev
->flags
)
4651 && !test_bit(R5_LOCKED
, &pdev
->flags
)
4652 && (test_bit(R5_UPTODATE
, &pdev
->flags
) ||
4653 test_bit(R5_Discard
, &pdev
->flags
))))) &&
4654 (s
.q_failed
|| ((test_bit(R5_Insync
, &qdev
->flags
)
4655 && !test_bit(R5_LOCKED
, &qdev
->flags
)
4656 && (test_bit(R5_UPTODATE
, &qdev
->flags
) ||
4657 test_bit(R5_Discard
, &qdev
->flags
))))))
4658 handle_stripe_clean_event(conf
, sh
, disks
, &s
.return_bi
);
4661 r5c_handle_cached_data_endio(conf
, sh
, disks
, &s
.return_bi
);
4662 r5l_stripe_write_finished(sh
);
4664 /* Now we might consider reading some blocks, either to check/generate
4665 * parity, or to satisfy requests
4666 * or to load a block that is being partially written.
4668 if (s
.to_read
|| s
.non_overwrite
4669 || (conf
->level
== 6 && s
.to_write
&& s
.failed
)
4670 || (s
.syncing
&& (s
.uptodate
+ s
.compute
< disks
))
4673 handle_stripe_fill(sh
, &s
, disks
);
4676 * When the stripe finishes full journal write cycle (write to journal
4677 * and raid disk), this is the clean up procedure so it is ready for
4680 r5c_finish_stripe_write_out(conf
, sh
, &s
);
4683 * Now to consider new write requests, cache write back and what else,
4684 * if anything should be read. We do not handle new writes when:
4685 * 1/ A 'write' operation (copy+xor) is already in flight.
4686 * 2/ A 'check' operation is in flight, as it may clobber the parity
4688 * 3/ A r5c cache log write is in flight.
4691 if (!sh
->reconstruct_state
&& !sh
->check_state
&& !sh
->log_io
) {
4692 if (!r5c_is_writeback(conf
->log
)) {
4694 handle_stripe_dirtying(conf
, sh
, &s
, disks
);
4695 } else { /* write back cache */
4698 /* First, try handle writes in caching phase */
4700 ret
= r5c_try_caching_write(conf
, sh
, &s
,
4703 * If caching phase failed: ret == -EAGAIN
4705 * stripe under reclaim: !caching && injournal
4707 * fall back to handle_stripe_dirtying()
4709 if (ret
== -EAGAIN
||
4710 /* stripe under reclaim: !caching && injournal */
4711 (!test_bit(STRIPE_R5C_CACHING
, &sh
->state
) &&
4713 ret
= handle_stripe_dirtying(conf
, sh
, &s
,
4721 /* maybe we need to check and possibly fix the parity for this stripe
4722 * Any reads will already have been scheduled, so we just see if enough
4723 * data is available. The parity check is held off while parity
4724 * dependent operations are in flight.
4726 if (sh
->check_state
||
4727 (s
.syncing
&& s
.locked
== 0 &&
4728 !test_bit(STRIPE_COMPUTE_RUN
, &sh
->state
) &&
4729 !test_bit(STRIPE_INSYNC
, &sh
->state
))) {
4730 if (conf
->level
== 6)
4731 handle_parity_checks6(conf
, sh
, &s
, disks
);
4733 handle_parity_checks5(conf
, sh
, &s
, disks
);
4736 if ((s
.replacing
|| s
.syncing
) && s
.locked
== 0
4737 && !test_bit(STRIPE_COMPUTE_RUN
, &sh
->state
)
4738 && !test_bit(STRIPE_REPLACED
, &sh
->state
)) {
4739 /* Write out to replacement devices where possible */
4740 for (i
= 0; i
< conf
->raid_disks
; i
++)
4741 if (test_bit(R5_NeedReplace
, &sh
->dev
[i
].flags
)) {
4742 WARN_ON(!test_bit(R5_UPTODATE
, &sh
->dev
[i
].flags
));
4743 set_bit(R5_WantReplace
, &sh
->dev
[i
].flags
);
4744 set_bit(R5_LOCKED
, &sh
->dev
[i
].flags
);
4748 set_bit(STRIPE_INSYNC
, &sh
->state
);
4749 set_bit(STRIPE_REPLACED
, &sh
->state
);
4751 if ((s
.syncing
|| s
.replacing
) && s
.locked
== 0 &&
4752 !test_bit(STRIPE_COMPUTE_RUN
, &sh
->state
) &&
4753 test_bit(STRIPE_INSYNC
, &sh
->state
)) {
4754 md_done_sync(conf
->mddev
, STRIPE_SECTORS
, 1);
4755 clear_bit(STRIPE_SYNCING
, &sh
->state
);
4756 if (test_and_clear_bit(R5_Overlap
, &sh
->dev
[sh
->pd_idx
].flags
))
4757 wake_up(&conf
->wait_for_overlap
);
4760 /* If the failed drives are just a ReadError, then we might need
4761 * to progress the repair/check process
4763 if (s
.failed
<= conf
->max_degraded
&& !conf
->mddev
->ro
)
4764 for (i
= 0; i
< s
.failed
; i
++) {
4765 struct r5dev
*dev
= &sh
->dev
[s
.failed_num
[i
]];
4766 if (test_bit(R5_ReadError
, &dev
->flags
)
4767 && !test_bit(R5_LOCKED
, &dev
->flags
)
4768 && test_bit(R5_UPTODATE
, &dev
->flags
)
4770 if (!test_bit(R5_ReWrite
, &dev
->flags
)) {
4771 set_bit(R5_Wantwrite
, &dev
->flags
);
4772 set_bit(R5_ReWrite
, &dev
->flags
);
4773 set_bit(R5_LOCKED
, &dev
->flags
);
4776 /* let's read it back */
4777 set_bit(R5_Wantread
, &dev
->flags
);
4778 set_bit(R5_LOCKED
, &dev
->flags
);
4784 /* Finish reconstruct operations initiated by the expansion process */
4785 if (sh
->reconstruct_state
== reconstruct_state_result
) {
4786 struct stripe_head
*sh_src
4787 = raid5_get_active_stripe(conf
, sh
->sector
, 1, 1, 1);
4788 if (sh_src
&& test_bit(STRIPE_EXPAND_SOURCE
, &sh_src
->state
)) {
4789 /* sh cannot be written until sh_src has been read.
4790 * so arrange for sh to be delayed a little
4792 set_bit(STRIPE_DELAYED
, &sh
->state
);
4793 set_bit(STRIPE_HANDLE
, &sh
->state
);
4794 if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE
,
4796 atomic_inc(&conf
->preread_active_stripes
);
4797 raid5_release_stripe(sh_src
);
4801 raid5_release_stripe(sh_src
);
4803 sh
->reconstruct_state
= reconstruct_state_idle
;
4804 clear_bit(STRIPE_EXPANDING
, &sh
->state
);
4805 for (i
= conf
->raid_disks
; i
--; ) {
4806 set_bit(R5_Wantwrite
, &sh
->dev
[i
].flags
);
4807 set_bit(R5_LOCKED
, &sh
->dev
[i
].flags
);
4812 if (s
.expanded
&& test_bit(STRIPE_EXPANDING
, &sh
->state
) &&
4813 !sh
->reconstruct_state
) {
4814 /* Need to write out all blocks after computing parity */
4815 sh
->disks
= conf
->raid_disks
;
4816 stripe_set_idx(sh
->sector
, conf
, 0, sh
);
4817 schedule_reconstruction(sh
, &s
, 1, 1);
4818 } else if (s
.expanded
&& !sh
->reconstruct_state
&& s
.locked
== 0) {
4819 clear_bit(STRIPE_EXPAND_READY
, &sh
->state
);
4820 atomic_dec(&conf
->reshape_stripes
);
4821 wake_up(&conf
->wait_for_overlap
);
4822 md_done_sync(conf
->mddev
, STRIPE_SECTORS
, 1);
4825 if (s
.expanding
&& s
.locked
== 0 &&
4826 !test_bit(STRIPE_COMPUTE_RUN
, &sh
->state
))
4827 handle_stripe_expansion(conf
, sh
);
4830 /* wait for this device to become unblocked */
4831 if (unlikely(s
.blocked_rdev
)) {
4832 if (conf
->mddev
->external
)
4833 md_wait_for_blocked_rdev(s
.blocked_rdev
,
4836 /* Internal metadata will immediately
4837 * be written by raid5d, so we don't
4838 * need to wait here.
4840 rdev_dec_pending(s
.blocked_rdev
,
4844 if (s
.handle_bad_blocks
)
4845 for (i
= disks
; i
--; ) {
4846 struct md_rdev
*rdev
;
4847 struct r5dev
*dev
= &sh
->dev
[i
];
4848 if (test_and_clear_bit(R5_WriteError
, &dev
->flags
)) {
4849 /* We own a safe reference to the rdev */
4850 rdev
= conf
->disks
[i
].rdev
;
4851 if (!rdev_set_badblocks(rdev
, sh
->sector
,
4853 md_error(conf
->mddev
, rdev
);
4854 rdev_dec_pending(rdev
, conf
->mddev
);
4856 if (test_and_clear_bit(R5_MadeGood
, &dev
->flags
)) {
4857 rdev
= conf
->disks
[i
].rdev
;
4858 rdev_clear_badblocks(rdev
, sh
->sector
,
4860 rdev_dec_pending(rdev
, conf
->mddev
);
4862 if (test_and_clear_bit(R5_MadeGoodRepl
, &dev
->flags
)) {
4863 rdev
= conf
->disks
[i
].replacement
;
4865 /* rdev have been moved down */
4866 rdev
= conf
->disks
[i
].rdev
;
4867 rdev_clear_badblocks(rdev
, sh
->sector
,
4869 rdev_dec_pending(rdev
, conf
->mddev
);
4874 raid_run_ops(sh
, s
.ops_request
);
4878 if (s
.dec_preread_active
) {
4879 /* We delay this until after ops_run_io so that if make_request
4880 * is waiting on a flush, it won't continue until the writes
4881 * have actually been submitted.
4883 atomic_dec(&conf
->preread_active_stripes
);
4884 if (atomic_read(&conf
->preread_active_stripes
) <
4886 md_wakeup_thread(conf
->mddev
->thread
);
4889 if (!bio_list_empty(&s
.return_bi
)) {
4890 if (test_bit(MD_SB_CHANGE_PENDING
, &conf
->mddev
->sb_flags
)) {
4891 spin_lock_irq(&conf
->device_lock
);
4892 bio_list_merge(&conf
->return_bi
, &s
.return_bi
);
4893 spin_unlock_irq(&conf
->device_lock
);
4894 md_wakeup_thread(conf
->mddev
->thread
);
4896 return_io(&s
.return_bi
);
4899 clear_bit_unlock(STRIPE_ACTIVE
, &sh
->state
);
4902 static void raid5_activate_delayed(struct r5conf
*conf
)
4904 if (atomic_read(&conf
->preread_active_stripes
) < IO_THRESHOLD
) {
4905 while (!list_empty(&conf
->delayed_list
)) {
4906 struct list_head
*l
= conf
->delayed_list
.next
;
4907 struct stripe_head
*sh
;
4908 sh
= list_entry(l
, struct stripe_head
, lru
);
4910 clear_bit(STRIPE_DELAYED
, &sh
->state
);
4911 if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE
, &sh
->state
))
4912 atomic_inc(&conf
->preread_active_stripes
);
4913 list_add_tail(&sh
->lru
, &conf
->hold_list
);
4914 raid5_wakeup_stripe_thread(sh
);
4919 static void activate_bit_delay(struct r5conf
*conf
,
4920 struct list_head
*temp_inactive_list
)
4922 /* device_lock is held */
4923 struct list_head head
;
4924 list_add(&head
, &conf
->bitmap_list
);
4925 list_del_init(&conf
->bitmap_list
);
4926 while (!list_empty(&head
)) {
4927 struct stripe_head
*sh
= list_entry(head
.next
, struct stripe_head
, lru
);
4929 list_del_init(&sh
->lru
);
4930 atomic_inc(&sh
->count
);
4931 hash
= sh
->hash_lock_index
;
4932 __release_stripe(conf
, sh
, &temp_inactive_list
[hash
]);
4936 static int raid5_congested(struct mddev
*mddev
, int bits
)
4938 struct r5conf
*conf
= mddev
->private;
4940 /* No difference between reads and writes. Just check
4941 * how busy the stripe_cache is
4944 if (test_bit(R5_INACTIVE_BLOCKED
, &conf
->cache_state
))
4947 /* Also checks whether there is pressure on r5cache log space */
4948 if (test_bit(R5C_LOG_TIGHT
, &conf
->cache_state
))
4952 if (atomic_read(&conf
->empty_inactive_list_nr
))
4958 static int in_chunk_boundary(struct mddev
*mddev
, struct bio
*bio
)
4960 struct r5conf
*conf
= mddev
->private;
4961 sector_t sector
= bio
->bi_iter
.bi_sector
+ get_start_sect(bio
->bi_bdev
);
4962 unsigned int chunk_sectors
;
4963 unsigned int bio_sectors
= bio_sectors(bio
);
4965 chunk_sectors
= min(conf
->chunk_sectors
, conf
->prev_chunk_sectors
);
4966 return chunk_sectors
>=
4967 ((sector
& (chunk_sectors
- 1)) + bio_sectors
);
4971 * add bio to the retry LIFO ( in O(1) ... we are in interrupt )
4972 * later sampled by raid5d.
4974 static void add_bio_to_retry(struct bio
*bi
,struct r5conf
*conf
)
4976 unsigned long flags
;
4978 spin_lock_irqsave(&conf
->device_lock
, flags
);
4980 bi
->bi_next
= conf
->retry_read_aligned_list
;
4981 conf
->retry_read_aligned_list
= bi
;
4983 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
4984 md_wakeup_thread(conf
->mddev
->thread
);
4987 static struct bio
*remove_bio_from_retry(struct r5conf
*conf
)
4991 bi
= conf
->retry_read_aligned
;
4993 conf
->retry_read_aligned
= NULL
;
4996 bi
= conf
->retry_read_aligned_list
;
4998 conf
->retry_read_aligned_list
= bi
->bi_next
;
5001 * this sets the active strip count to 1 and the processed
5002 * strip count to zero (upper 8 bits)
5004 raid5_set_bi_stripes(bi
, 1); /* biased count of active stripes */
5011 * The "raid5_align_endio" should check if the read succeeded and if it
5012 * did, call bio_endio on the original bio (having bio_put the new bio
5014 * If the read failed..
5016 static void raid5_align_endio(struct bio
*bi
)
5018 struct bio
* raid_bi
= bi
->bi_private
;
5019 struct mddev
*mddev
;
5020 struct r5conf
*conf
;
5021 struct md_rdev
*rdev
;
5022 int error
= bi
->bi_error
;
5026 rdev
= (void*)raid_bi
->bi_next
;
5027 raid_bi
->bi_next
= NULL
;
5028 mddev
= rdev
->mddev
;
5029 conf
= mddev
->private;
5031 rdev_dec_pending(rdev
, conf
->mddev
);
5034 trace_block_bio_complete(bdev_get_queue(raid_bi
->bi_bdev
),
5037 if (atomic_dec_and_test(&conf
->active_aligned_reads
))
5038 wake_up(&conf
->wait_for_quiescent
);
5042 pr_debug("raid5_align_endio : io error...handing IO for a retry\n");
5044 add_bio_to_retry(raid_bi
, conf
);
5047 static int raid5_read_one_chunk(struct mddev
*mddev
, struct bio
*raid_bio
)
5049 struct r5conf
*conf
= mddev
->private;
5051 struct bio
* align_bi
;
5052 struct md_rdev
*rdev
;
5053 sector_t end_sector
;
5055 if (!in_chunk_boundary(mddev
, raid_bio
)) {
5056 pr_debug("%s: non aligned\n", __func__
);
5060 * use bio_clone_fast to make a copy of the bio
5062 align_bi
= bio_clone_fast(raid_bio
, GFP_NOIO
, mddev
->bio_set
);
5066 * set bi_end_io to a new function, and set bi_private to the
5069 align_bi
->bi_end_io
= raid5_align_endio
;
5070 align_bi
->bi_private
= raid_bio
;
5074 align_bi
->bi_iter
.bi_sector
=
5075 raid5_compute_sector(conf
, raid_bio
->bi_iter
.bi_sector
,
5078 end_sector
= bio_end_sector(align_bi
);
5080 rdev
= rcu_dereference(conf
->disks
[dd_idx
].replacement
);
5081 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
) ||
5082 rdev
->recovery_offset
< end_sector
) {
5083 rdev
= rcu_dereference(conf
->disks
[dd_idx
].rdev
);
5085 (test_bit(Faulty
, &rdev
->flags
) ||
5086 !(test_bit(In_sync
, &rdev
->flags
) ||
5087 rdev
->recovery_offset
>= end_sector
)))
5091 if (r5c_big_stripe_cached(conf
, align_bi
->bi_iter
.bi_sector
)) {
5101 atomic_inc(&rdev
->nr_pending
);
5103 raid_bio
->bi_next
= (void*)rdev
;
5104 align_bi
->bi_bdev
= rdev
->bdev
;
5105 bio_clear_flag(align_bi
, BIO_SEG_VALID
);
5107 if (is_badblock(rdev
, align_bi
->bi_iter
.bi_sector
,
5108 bio_sectors(align_bi
),
5109 &first_bad
, &bad_sectors
)) {
5111 rdev_dec_pending(rdev
, mddev
);
5115 /* No reshape active, so we can trust rdev->data_offset */
5116 align_bi
->bi_iter
.bi_sector
+= rdev
->data_offset
;
5118 spin_lock_irq(&conf
->device_lock
);
5119 wait_event_lock_irq(conf
->wait_for_quiescent
,
5122 atomic_inc(&conf
->active_aligned_reads
);
5123 spin_unlock_irq(&conf
->device_lock
);
5126 trace_block_bio_remap(bdev_get_queue(align_bi
->bi_bdev
),
5127 align_bi
, disk_devt(mddev
->gendisk
),
5128 raid_bio
->bi_iter
.bi_sector
);
5129 generic_make_request(align_bi
);
5138 static struct bio
*chunk_aligned_read(struct mddev
*mddev
, struct bio
*raid_bio
)
5143 sector_t sector
= raid_bio
->bi_iter
.bi_sector
;
5144 unsigned chunk_sects
= mddev
->chunk_sectors
;
5145 unsigned sectors
= chunk_sects
- (sector
& (chunk_sects
-1));
5147 if (sectors
< bio_sectors(raid_bio
)) {
5148 split
= bio_split(raid_bio
, sectors
, GFP_NOIO
, fs_bio_set
);
5149 bio_chain(split
, raid_bio
);
5153 if (!raid5_read_one_chunk(mddev
, split
)) {
5154 if (split
!= raid_bio
)
5155 generic_make_request(raid_bio
);
5158 } while (split
!= raid_bio
);
5163 /* __get_priority_stripe - get the next stripe to process
5165 * Full stripe writes are allowed to pass preread active stripes up until
5166 * the bypass_threshold is exceeded. In general the bypass_count
5167 * increments when the handle_list is handled before the hold_list; however, it
5168 * will not be incremented when STRIPE_IO_STARTED is sampled set signifying a
5169 * stripe with in flight i/o. The bypass_count will be reset when the
5170 * head of the hold_list has changed, i.e. the head was promoted to the
5173 static struct stripe_head
*__get_priority_stripe(struct r5conf
*conf
, int group
)
5175 struct stripe_head
*sh
= NULL
, *tmp
;
5176 struct list_head
*handle_list
= NULL
;
5177 struct r5worker_group
*wg
= NULL
;
5179 if (conf
->worker_cnt_per_group
== 0) {
5180 handle_list
= &conf
->handle_list
;
5181 } else if (group
!= ANY_GROUP
) {
5182 handle_list
= &conf
->worker_groups
[group
].handle_list
;
5183 wg
= &conf
->worker_groups
[group
];
5186 for (i
= 0; i
< conf
->group_cnt
; i
++) {
5187 handle_list
= &conf
->worker_groups
[i
].handle_list
;
5188 wg
= &conf
->worker_groups
[i
];
5189 if (!list_empty(handle_list
))
5194 pr_debug("%s: handle: %s hold: %s full_writes: %d bypass_count: %d\n",
5196 list_empty(handle_list
) ? "empty" : "busy",
5197 list_empty(&conf
->hold_list
) ? "empty" : "busy",
5198 atomic_read(&conf
->pending_full_writes
), conf
->bypass_count
);
5200 if (!list_empty(handle_list
)) {
5201 sh
= list_entry(handle_list
->next
, typeof(*sh
), lru
);
5203 if (list_empty(&conf
->hold_list
))
5204 conf
->bypass_count
= 0;
5205 else if (!test_bit(STRIPE_IO_STARTED
, &sh
->state
)) {
5206 if (conf
->hold_list
.next
== conf
->last_hold
)
5207 conf
->bypass_count
++;
5209 conf
->last_hold
= conf
->hold_list
.next
;
5210 conf
->bypass_count
-= conf
->bypass_threshold
;
5211 if (conf
->bypass_count
< 0)
5212 conf
->bypass_count
= 0;
5215 } else if (!list_empty(&conf
->hold_list
) &&
5216 ((conf
->bypass_threshold
&&
5217 conf
->bypass_count
> conf
->bypass_threshold
) ||
5218 atomic_read(&conf
->pending_full_writes
) == 0)) {
5220 list_for_each_entry(tmp
, &conf
->hold_list
, lru
) {
5221 if (conf
->worker_cnt_per_group
== 0 ||
5222 group
== ANY_GROUP
||
5223 !cpu_online(tmp
->cpu
) ||
5224 cpu_to_group(tmp
->cpu
) == group
) {
5231 conf
->bypass_count
-= conf
->bypass_threshold
;
5232 if (conf
->bypass_count
< 0)
5233 conf
->bypass_count
= 0;
5245 list_del_init(&sh
->lru
);
5246 BUG_ON(atomic_inc_return(&sh
->count
) != 1);
5250 struct raid5_plug_cb
{
5251 struct blk_plug_cb cb
;
5252 struct list_head list
;
5253 struct list_head temp_inactive_list
[NR_STRIPE_HASH_LOCKS
];
5256 static void raid5_unplug(struct blk_plug_cb
*blk_cb
, bool from_schedule
)
5258 struct raid5_plug_cb
*cb
= container_of(
5259 blk_cb
, struct raid5_plug_cb
, cb
);
5260 struct stripe_head
*sh
;
5261 struct mddev
*mddev
= cb
->cb
.data
;
5262 struct r5conf
*conf
= mddev
->private;
5266 if (cb
->list
.next
&& !list_empty(&cb
->list
)) {
5267 spin_lock_irq(&conf
->device_lock
);
5268 while (!list_empty(&cb
->list
)) {
5269 sh
= list_first_entry(&cb
->list
, struct stripe_head
, lru
);
5270 list_del_init(&sh
->lru
);
5272 * avoid race release_stripe_plug() sees
5273 * STRIPE_ON_UNPLUG_LIST clear but the stripe
5274 * is still in our list
5276 smp_mb__before_atomic();
5277 clear_bit(STRIPE_ON_UNPLUG_LIST
, &sh
->state
);
5279 * STRIPE_ON_RELEASE_LIST could be set here. In that
5280 * case, the count is always > 1 here
5282 hash
= sh
->hash_lock_index
;
5283 __release_stripe(conf
, sh
, &cb
->temp_inactive_list
[hash
]);
5286 spin_unlock_irq(&conf
->device_lock
);
5288 release_inactive_stripe_list(conf
, cb
->temp_inactive_list
,
5289 NR_STRIPE_HASH_LOCKS
);
5291 trace_block_unplug(mddev
->queue
, cnt
, !from_schedule
);
5295 static void release_stripe_plug(struct mddev
*mddev
,
5296 struct stripe_head
*sh
)
5298 struct blk_plug_cb
*blk_cb
= blk_check_plugged(
5299 raid5_unplug
, mddev
,
5300 sizeof(struct raid5_plug_cb
));
5301 struct raid5_plug_cb
*cb
;
5304 raid5_release_stripe(sh
);
5308 cb
= container_of(blk_cb
, struct raid5_plug_cb
, cb
);
5310 if (cb
->list
.next
== NULL
) {
5312 INIT_LIST_HEAD(&cb
->list
);
5313 for (i
= 0; i
< NR_STRIPE_HASH_LOCKS
; i
++)
5314 INIT_LIST_HEAD(cb
->temp_inactive_list
+ i
);
5317 if (!test_and_set_bit(STRIPE_ON_UNPLUG_LIST
, &sh
->state
))
5318 list_add_tail(&sh
->lru
, &cb
->list
);
5320 raid5_release_stripe(sh
);
5323 static void make_discard_request(struct mddev
*mddev
, struct bio
*bi
)
5325 struct r5conf
*conf
= mddev
->private;
5326 sector_t logical_sector
, last_sector
;
5327 struct stripe_head
*sh
;
5331 if (mddev
->reshape_position
!= MaxSector
)
5332 /* Skip discard while reshape is happening */
5335 logical_sector
= bi
->bi_iter
.bi_sector
& ~((sector_t
)STRIPE_SECTORS
-1);
5336 last_sector
= bi
->bi_iter
.bi_sector
+ (bi
->bi_iter
.bi_size
>>9);
5339 bi
->bi_phys_segments
= 1; /* over-loaded to count active stripes */
5341 stripe_sectors
= conf
->chunk_sectors
*
5342 (conf
->raid_disks
- conf
->max_degraded
);
5343 logical_sector
= DIV_ROUND_UP_SECTOR_T(logical_sector
,
5345 sector_div(last_sector
, stripe_sectors
);
5347 logical_sector
*= conf
->chunk_sectors
;
5348 last_sector
*= conf
->chunk_sectors
;
5350 for (; logical_sector
< last_sector
;
5351 logical_sector
+= STRIPE_SECTORS
) {
5355 sh
= raid5_get_active_stripe(conf
, logical_sector
, 0, 0, 0);
5356 prepare_to_wait(&conf
->wait_for_overlap
, &w
,
5357 TASK_UNINTERRUPTIBLE
);
5358 set_bit(R5_Overlap
, &sh
->dev
[sh
->pd_idx
].flags
);
5359 if (test_bit(STRIPE_SYNCING
, &sh
->state
)) {
5360 raid5_release_stripe(sh
);
5364 clear_bit(R5_Overlap
, &sh
->dev
[sh
->pd_idx
].flags
);
5365 spin_lock_irq(&sh
->stripe_lock
);
5366 for (d
= 0; d
< conf
->raid_disks
; d
++) {
5367 if (d
== sh
->pd_idx
|| d
== sh
->qd_idx
)
5369 if (sh
->dev
[d
].towrite
|| sh
->dev
[d
].toread
) {
5370 set_bit(R5_Overlap
, &sh
->dev
[d
].flags
);
5371 spin_unlock_irq(&sh
->stripe_lock
);
5372 raid5_release_stripe(sh
);
5377 set_bit(STRIPE_DISCARD
, &sh
->state
);
5378 finish_wait(&conf
->wait_for_overlap
, &w
);
5379 sh
->overwrite_disks
= 0;
5380 for (d
= 0; d
< conf
->raid_disks
; d
++) {
5381 if (d
== sh
->pd_idx
|| d
== sh
->qd_idx
)
5383 sh
->dev
[d
].towrite
= bi
;
5384 set_bit(R5_OVERWRITE
, &sh
->dev
[d
].flags
);
5385 raid5_inc_bi_active_stripes(bi
);
5386 sh
->overwrite_disks
++;
5388 spin_unlock_irq(&sh
->stripe_lock
);
5389 if (conf
->mddev
->bitmap
) {
5391 d
< conf
->raid_disks
- conf
->max_degraded
;
5393 bitmap_startwrite(mddev
->bitmap
,
5397 sh
->bm_seq
= conf
->seq_flush
+ 1;
5398 set_bit(STRIPE_BIT_DELAY
, &sh
->state
);
5401 set_bit(STRIPE_HANDLE
, &sh
->state
);
5402 clear_bit(STRIPE_DELAYED
, &sh
->state
);
5403 if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE
, &sh
->state
))
5404 atomic_inc(&conf
->preread_active_stripes
);
5405 release_stripe_plug(mddev
, sh
);
5408 remaining
= raid5_dec_bi_active_stripes(bi
);
5409 if (remaining
== 0) {
5410 md_write_end(mddev
);
5415 static void raid5_make_request(struct mddev
*mddev
, struct bio
* bi
)
5417 struct r5conf
*conf
= mddev
->private;
5419 sector_t new_sector
;
5420 sector_t logical_sector
, last_sector
;
5421 struct stripe_head
*sh
;
5422 const int rw
= bio_data_dir(bi
);
5426 bool do_flush
= false;
5428 if (unlikely(bi
->bi_opf
& REQ_PREFLUSH
)) {
5429 int ret
= r5l_handle_flush_request(conf
->log
, bi
);
5433 if (ret
== -ENODEV
) {
5434 md_flush_request(mddev
, bi
);
5437 /* ret == -EAGAIN, fallback */
5439 * if r5l_handle_flush_request() didn't clear REQ_PREFLUSH,
5440 * we need to flush journal device
5442 do_flush
= bi
->bi_opf
& REQ_PREFLUSH
;
5445 md_write_start(mddev
, bi
);
5448 * If array is degraded, better not do chunk aligned read because
5449 * later we might have to read it again in order to reconstruct
5450 * data on failed drives.
5452 if (rw
== READ
&& mddev
->degraded
== 0 &&
5453 mddev
->reshape_position
== MaxSector
) {
5454 bi
= chunk_aligned_read(mddev
, bi
);
5459 if (unlikely(bio_op(bi
) == REQ_OP_DISCARD
)) {
5460 make_discard_request(mddev
, bi
);
5464 logical_sector
= bi
->bi_iter
.bi_sector
& ~((sector_t
)STRIPE_SECTORS
-1);
5465 last_sector
= bio_end_sector(bi
);
5467 bi
->bi_phys_segments
= 1; /* over-loaded to count active stripes */
5469 prepare_to_wait(&conf
->wait_for_overlap
, &w
, TASK_UNINTERRUPTIBLE
);
5470 for (;logical_sector
< last_sector
; logical_sector
+= STRIPE_SECTORS
) {
5476 seq
= read_seqcount_begin(&conf
->gen_lock
);
5479 prepare_to_wait(&conf
->wait_for_overlap
, &w
,
5480 TASK_UNINTERRUPTIBLE
);
5481 if (unlikely(conf
->reshape_progress
!= MaxSector
)) {
5482 /* spinlock is needed as reshape_progress may be
5483 * 64bit on a 32bit platform, and so it might be
5484 * possible to see a half-updated value
5485 * Of course reshape_progress could change after
5486 * the lock is dropped, so once we get a reference
5487 * to the stripe that we think it is, we will have
5490 spin_lock_irq(&conf
->device_lock
);
5491 if (mddev
->reshape_backwards
5492 ? logical_sector
< conf
->reshape_progress
5493 : logical_sector
>= conf
->reshape_progress
) {
5496 if (mddev
->reshape_backwards
5497 ? logical_sector
< conf
->reshape_safe
5498 : logical_sector
>= conf
->reshape_safe
) {
5499 spin_unlock_irq(&conf
->device_lock
);
5505 spin_unlock_irq(&conf
->device_lock
);
5508 new_sector
= raid5_compute_sector(conf
, logical_sector
,
5511 pr_debug("raid456: raid5_make_request, sector %llu logical %llu\n",
5512 (unsigned long long)new_sector
,
5513 (unsigned long long)logical_sector
);
5515 sh
= raid5_get_active_stripe(conf
, new_sector
, previous
,
5516 (bi
->bi_opf
& REQ_RAHEAD
), 0);
5518 if (unlikely(previous
)) {
5519 /* expansion might have moved on while waiting for a
5520 * stripe, so we must do the range check again.
5521 * Expansion could still move past after this
5522 * test, but as we are holding a reference to
5523 * 'sh', we know that if that happens,
5524 * STRIPE_EXPANDING will get set and the expansion
5525 * won't proceed until we finish with the stripe.
5528 spin_lock_irq(&conf
->device_lock
);
5529 if (mddev
->reshape_backwards
5530 ? logical_sector
>= conf
->reshape_progress
5531 : logical_sector
< conf
->reshape_progress
)
5532 /* mismatch, need to try again */
5534 spin_unlock_irq(&conf
->device_lock
);
5536 raid5_release_stripe(sh
);
5542 if (read_seqcount_retry(&conf
->gen_lock
, seq
)) {
5543 /* Might have got the wrong stripe_head
5546 raid5_release_stripe(sh
);
5551 logical_sector
>= mddev
->suspend_lo
&&
5552 logical_sector
< mddev
->suspend_hi
) {
5553 raid5_release_stripe(sh
);
5554 /* As the suspend_* range is controlled by
5555 * userspace, we want an interruptible
5558 flush_signals(current
);
5559 prepare_to_wait(&conf
->wait_for_overlap
,
5560 &w
, TASK_INTERRUPTIBLE
);
5561 if (logical_sector
>= mddev
->suspend_lo
&&
5562 logical_sector
< mddev
->suspend_hi
) {
5569 if (test_bit(STRIPE_EXPANDING
, &sh
->state
) ||
5570 !add_stripe_bio(sh
, bi
, dd_idx
, rw
, previous
)) {
5571 /* Stripe is busy expanding or
5572 * add failed due to overlap. Flush everything
5575 md_wakeup_thread(mddev
->thread
);
5576 raid5_release_stripe(sh
);
5582 set_bit(STRIPE_R5C_PREFLUSH
, &sh
->state
);
5583 /* we only need flush for one stripe */
5587 set_bit(STRIPE_HANDLE
, &sh
->state
);
5588 clear_bit(STRIPE_DELAYED
, &sh
->state
);
5589 if ((!sh
->batch_head
|| sh
== sh
->batch_head
) &&
5590 (bi
->bi_opf
& REQ_SYNC
) &&
5591 !test_and_set_bit(STRIPE_PREREAD_ACTIVE
, &sh
->state
))
5592 atomic_inc(&conf
->preread_active_stripes
);
5593 release_stripe_plug(mddev
, sh
);
5595 /* cannot get stripe for read-ahead, just give-up */
5596 bi
->bi_error
= -EIO
;
5600 finish_wait(&conf
->wait_for_overlap
, &w
);
5602 remaining
= raid5_dec_bi_active_stripes(bi
);
5603 if (remaining
== 0) {
5606 md_write_end(mddev
);
5608 trace_block_bio_complete(bdev_get_queue(bi
->bi_bdev
),
5614 static sector_t
raid5_size(struct mddev
*mddev
, sector_t sectors
, int raid_disks
);
5616 static sector_t
reshape_request(struct mddev
*mddev
, sector_t sector_nr
, int *skipped
)
5618 /* reshaping is quite different to recovery/resync so it is
5619 * handled quite separately ... here.
5621 * On each call to sync_request, we gather one chunk worth of
5622 * destination stripes and flag them as expanding.
5623 * Then we find all the source stripes and request reads.
5624 * As the reads complete, handle_stripe will copy the data
5625 * into the destination stripe and release that stripe.
5627 struct r5conf
*conf
= mddev
->private;
5628 struct stripe_head
*sh
;
5629 sector_t first_sector
, last_sector
;
5630 int raid_disks
= conf
->previous_raid_disks
;
5631 int data_disks
= raid_disks
- conf
->max_degraded
;
5632 int new_data_disks
= conf
->raid_disks
- conf
->max_degraded
;
5635 sector_t writepos
, readpos
, safepos
;
5636 sector_t stripe_addr
;
5637 int reshape_sectors
;
5638 struct list_head stripes
;
5641 if (sector_nr
== 0) {
5642 /* If restarting in the middle, skip the initial sectors */
5643 if (mddev
->reshape_backwards
&&
5644 conf
->reshape_progress
< raid5_size(mddev
, 0, 0)) {
5645 sector_nr
= raid5_size(mddev
, 0, 0)
5646 - conf
->reshape_progress
;
5647 } else if (mddev
->reshape_backwards
&&
5648 conf
->reshape_progress
== MaxSector
) {
5649 /* shouldn't happen, but just in case, finish up.*/
5650 sector_nr
= MaxSector
;
5651 } else if (!mddev
->reshape_backwards
&&
5652 conf
->reshape_progress
> 0)
5653 sector_nr
= conf
->reshape_progress
;
5654 sector_div(sector_nr
, new_data_disks
);
5656 mddev
->curr_resync_completed
= sector_nr
;
5657 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
5664 /* We need to process a full chunk at a time.
5665 * If old and new chunk sizes differ, we need to process the
5669 reshape_sectors
= max(conf
->chunk_sectors
, conf
->prev_chunk_sectors
);
5671 /* We update the metadata at least every 10 seconds, or when
5672 * the data about to be copied would over-write the source of
5673 * the data at the front of the range. i.e. one new_stripe
5674 * along from reshape_progress new_maps to after where
5675 * reshape_safe old_maps to
5677 writepos
= conf
->reshape_progress
;
5678 sector_div(writepos
, new_data_disks
);
5679 readpos
= conf
->reshape_progress
;
5680 sector_div(readpos
, data_disks
);
5681 safepos
= conf
->reshape_safe
;
5682 sector_div(safepos
, data_disks
);
5683 if (mddev
->reshape_backwards
) {
5684 BUG_ON(writepos
< reshape_sectors
);
5685 writepos
-= reshape_sectors
;
5686 readpos
+= reshape_sectors
;
5687 safepos
+= reshape_sectors
;
5689 writepos
+= reshape_sectors
;
5690 /* readpos and safepos are worst-case calculations.
5691 * A negative number is overly pessimistic, and causes
5692 * obvious problems for unsigned storage. So clip to 0.
5694 readpos
-= min_t(sector_t
, reshape_sectors
, readpos
);
5695 safepos
-= min_t(sector_t
, reshape_sectors
, safepos
);
5698 /* Having calculated the 'writepos' possibly use it
5699 * to set 'stripe_addr' which is where we will write to.
5701 if (mddev
->reshape_backwards
) {
5702 BUG_ON(conf
->reshape_progress
== 0);
5703 stripe_addr
= writepos
;
5704 BUG_ON((mddev
->dev_sectors
&
5705 ~((sector_t
)reshape_sectors
- 1))
5706 - reshape_sectors
- stripe_addr
5709 BUG_ON(writepos
!= sector_nr
+ reshape_sectors
);
5710 stripe_addr
= sector_nr
;
5713 /* 'writepos' is the most advanced device address we might write.
5714 * 'readpos' is the least advanced device address we might read.
5715 * 'safepos' is the least address recorded in the metadata as having
5717 * If there is a min_offset_diff, these are adjusted either by
5718 * increasing the safepos/readpos if diff is negative, or
5719 * increasing writepos if diff is positive.
5720 * If 'readpos' is then behind 'writepos', there is no way that we can
5721 * ensure safety in the face of a crash - that must be done by userspace
5722 * making a backup of the data. So in that case there is no particular
5723 * rush to update metadata.
5724 * Otherwise if 'safepos' is behind 'writepos', then we really need to
5725 * update the metadata to advance 'safepos' to match 'readpos' so that
5726 * we can be safe in the event of a crash.
5727 * So we insist on updating metadata if safepos is behind writepos and
5728 * readpos is beyond writepos.
5729 * In any case, update the metadata every 10 seconds.
5730 * Maybe that number should be configurable, but I'm not sure it is
5731 * worth it.... maybe it could be a multiple of safemode_delay???
5733 if (conf
->min_offset_diff
< 0) {
5734 safepos
+= -conf
->min_offset_diff
;
5735 readpos
+= -conf
->min_offset_diff
;
5737 writepos
+= conf
->min_offset_diff
;
5739 if ((mddev
->reshape_backwards
5740 ? (safepos
> writepos
&& readpos
< writepos
)
5741 : (safepos
< writepos
&& readpos
> writepos
)) ||
5742 time_after(jiffies
, conf
->reshape_checkpoint
+ 10*HZ
)) {
5743 /* Cannot proceed until we've updated the superblock... */
5744 wait_event(conf
->wait_for_overlap
,
5745 atomic_read(&conf
->reshape_stripes
)==0
5746 || test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
));
5747 if (atomic_read(&conf
->reshape_stripes
) != 0)
5749 mddev
->reshape_position
= conf
->reshape_progress
;
5750 mddev
->curr_resync_completed
= sector_nr
;
5751 conf
->reshape_checkpoint
= jiffies
;
5752 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
5753 md_wakeup_thread(mddev
->thread
);
5754 wait_event(mddev
->sb_wait
, mddev
->sb_flags
== 0 ||
5755 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
));
5756 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5758 spin_lock_irq(&conf
->device_lock
);
5759 conf
->reshape_safe
= mddev
->reshape_position
;
5760 spin_unlock_irq(&conf
->device_lock
);
5761 wake_up(&conf
->wait_for_overlap
);
5762 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
5765 INIT_LIST_HEAD(&stripes
);
5766 for (i
= 0; i
< reshape_sectors
; i
+= STRIPE_SECTORS
) {
5768 int skipped_disk
= 0;
5769 sh
= raid5_get_active_stripe(conf
, stripe_addr
+i
, 0, 0, 1);
5770 set_bit(STRIPE_EXPANDING
, &sh
->state
);
5771 atomic_inc(&conf
->reshape_stripes
);
5772 /* If any of this stripe is beyond the end of the old
5773 * array, then we need to zero those blocks
5775 for (j
=sh
->disks
; j
--;) {
5777 if (j
== sh
->pd_idx
)
5779 if (conf
->level
== 6 &&
5782 s
= raid5_compute_blocknr(sh
, j
, 0);
5783 if (s
< raid5_size(mddev
, 0, 0)) {
5787 memset(page_address(sh
->dev
[j
].page
), 0, STRIPE_SIZE
);
5788 set_bit(R5_Expanded
, &sh
->dev
[j
].flags
);
5789 set_bit(R5_UPTODATE
, &sh
->dev
[j
].flags
);
5791 if (!skipped_disk
) {
5792 set_bit(STRIPE_EXPAND_READY
, &sh
->state
);
5793 set_bit(STRIPE_HANDLE
, &sh
->state
);
5795 list_add(&sh
->lru
, &stripes
);
5797 spin_lock_irq(&conf
->device_lock
);
5798 if (mddev
->reshape_backwards
)
5799 conf
->reshape_progress
-= reshape_sectors
* new_data_disks
;
5801 conf
->reshape_progress
+= reshape_sectors
* new_data_disks
;
5802 spin_unlock_irq(&conf
->device_lock
);
5803 /* Ok, those stripe are ready. We can start scheduling
5804 * reads on the source stripes.
5805 * The source stripes are determined by mapping the first and last
5806 * block on the destination stripes.
5809 raid5_compute_sector(conf
, stripe_addr
*(new_data_disks
),
5812 raid5_compute_sector(conf
, ((stripe_addr
+reshape_sectors
)
5813 * new_data_disks
- 1),
5815 if (last_sector
>= mddev
->dev_sectors
)
5816 last_sector
= mddev
->dev_sectors
- 1;
5817 while (first_sector
<= last_sector
) {
5818 sh
= raid5_get_active_stripe(conf
, first_sector
, 1, 0, 1);
5819 set_bit(STRIPE_EXPAND_SOURCE
, &sh
->state
);
5820 set_bit(STRIPE_HANDLE
, &sh
->state
);
5821 raid5_release_stripe(sh
);
5822 first_sector
+= STRIPE_SECTORS
;
5824 /* Now that the sources are clearly marked, we can release
5825 * the destination stripes
5827 while (!list_empty(&stripes
)) {
5828 sh
= list_entry(stripes
.next
, struct stripe_head
, lru
);
5829 list_del_init(&sh
->lru
);
5830 raid5_release_stripe(sh
);
5832 /* If this takes us to the resync_max point where we have to pause,
5833 * then we need to write out the superblock.
5835 sector_nr
+= reshape_sectors
;
5836 retn
= reshape_sectors
;
5838 if (mddev
->curr_resync_completed
> mddev
->resync_max
||
5839 (sector_nr
- mddev
->curr_resync_completed
) * 2
5840 >= mddev
->resync_max
- mddev
->curr_resync_completed
) {
5841 /* Cannot proceed until we've updated the superblock... */
5842 wait_event(conf
->wait_for_overlap
,
5843 atomic_read(&conf
->reshape_stripes
) == 0
5844 || test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
));
5845 if (atomic_read(&conf
->reshape_stripes
) != 0)
5847 mddev
->reshape_position
= conf
->reshape_progress
;
5848 mddev
->curr_resync_completed
= sector_nr
;
5849 conf
->reshape_checkpoint
= jiffies
;
5850 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
5851 md_wakeup_thread(mddev
->thread
);
5852 wait_event(mddev
->sb_wait
,
5853 !test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
)
5854 || test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
));
5855 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5857 spin_lock_irq(&conf
->device_lock
);
5858 conf
->reshape_safe
= mddev
->reshape_position
;
5859 spin_unlock_irq(&conf
->device_lock
);
5860 wake_up(&conf
->wait_for_overlap
);
5861 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
5867 static inline sector_t
raid5_sync_request(struct mddev
*mddev
, sector_t sector_nr
,
5870 struct r5conf
*conf
= mddev
->private;
5871 struct stripe_head
*sh
;
5872 sector_t max_sector
= mddev
->dev_sectors
;
5873 sector_t sync_blocks
;
5874 int still_degraded
= 0;
5877 if (sector_nr
>= max_sector
) {
5878 /* just being told to finish up .. nothing much to do */
5880 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)) {
5885 if (mddev
->curr_resync
< max_sector
) /* aborted */
5886 bitmap_end_sync(mddev
->bitmap
, mddev
->curr_resync
,
5888 else /* completed sync */
5890 bitmap_close_sync(mddev
->bitmap
);
5895 /* Allow raid5_quiesce to complete */
5896 wait_event(conf
->wait_for_overlap
, conf
->quiesce
!= 2);
5898 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5899 return reshape_request(mddev
, sector_nr
, skipped
);
5901 /* No need to check resync_max as we never do more than one
5902 * stripe, and as resync_max will always be on a chunk boundary,
5903 * if the check in md_do_sync didn't fire, there is no chance
5904 * of overstepping resync_max here
5907 /* if there is too many failed drives and we are trying
5908 * to resync, then assert that we are finished, because there is
5909 * nothing we can do.
5911 if (mddev
->degraded
>= conf
->max_degraded
&&
5912 test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5913 sector_t rv
= mddev
->dev_sectors
- sector_nr
;
5917 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
) &&
5919 !bitmap_start_sync(mddev
->bitmap
, sector_nr
, &sync_blocks
, 1) &&
5920 sync_blocks
>= STRIPE_SECTORS
) {
5921 /* we can skip this block, and probably more */
5922 sync_blocks
/= STRIPE_SECTORS
;
5924 return sync_blocks
* STRIPE_SECTORS
; /* keep things rounded to whole stripes */
5927 bitmap_cond_end_sync(mddev
->bitmap
, sector_nr
, false);
5929 sh
= raid5_get_active_stripe(conf
, sector_nr
, 0, 1, 0);
5931 sh
= raid5_get_active_stripe(conf
, sector_nr
, 0, 0, 0);
5932 /* make sure we don't swamp the stripe cache if someone else
5933 * is trying to get access
5935 schedule_timeout_uninterruptible(1);
5937 /* Need to check if array will still be degraded after recovery/resync
5938 * Note in case of > 1 drive failures it's possible we're rebuilding
5939 * one drive while leaving another faulty drive in array.
5942 for (i
= 0; i
< conf
->raid_disks
; i
++) {
5943 struct md_rdev
*rdev
= ACCESS_ONCE(conf
->disks
[i
].rdev
);
5945 if (rdev
== NULL
|| test_bit(Faulty
, &rdev
->flags
))
5950 bitmap_start_sync(mddev
->bitmap
, sector_nr
, &sync_blocks
, still_degraded
);
5952 set_bit(STRIPE_SYNC_REQUESTED
, &sh
->state
);
5953 set_bit(STRIPE_HANDLE
, &sh
->state
);
5955 raid5_release_stripe(sh
);
5957 return STRIPE_SECTORS
;
5960 static int retry_aligned_read(struct r5conf
*conf
, struct bio
*raid_bio
)
5962 /* We may not be able to submit a whole bio at once as there
5963 * may not be enough stripe_heads available.
5964 * We cannot pre-allocate enough stripe_heads as we may need
5965 * more than exist in the cache (if we allow ever large chunks).
5966 * So we do one stripe head at a time and record in
5967 * ->bi_hw_segments how many have been done.
5969 * We *know* that this entire raid_bio is in one chunk, so
5970 * it will be only one 'dd_idx' and only need one call to raid5_compute_sector.
5972 struct stripe_head
*sh
;
5974 sector_t sector
, logical_sector
, last_sector
;
5979 logical_sector
= raid_bio
->bi_iter
.bi_sector
&
5980 ~((sector_t
)STRIPE_SECTORS
-1);
5981 sector
= raid5_compute_sector(conf
, logical_sector
,
5983 last_sector
= bio_end_sector(raid_bio
);
5985 for (; logical_sector
< last_sector
;
5986 logical_sector
+= STRIPE_SECTORS
,
5987 sector
+= STRIPE_SECTORS
,
5990 if (scnt
< raid5_bi_processed_stripes(raid_bio
))
5991 /* already done this stripe */
5994 sh
= raid5_get_active_stripe(conf
, sector
, 0, 1, 1);
5997 /* failed to get a stripe - must wait */
5998 raid5_set_bi_processed_stripes(raid_bio
, scnt
);
5999 conf
->retry_read_aligned
= raid_bio
;
6003 if (!add_stripe_bio(sh
, raid_bio
, dd_idx
, 0, 0)) {
6004 raid5_release_stripe(sh
);
6005 raid5_set_bi_processed_stripes(raid_bio
, scnt
);
6006 conf
->retry_read_aligned
= raid_bio
;
6010 set_bit(R5_ReadNoMerge
, &sh
->dev
[dd_idx
].flags
);
6012 raid5_release_stripe(sh
);
6015 remaining
= raid5_dec_bi_active_stripes(raid_bio
);
6016 if (remaining
== 0) {
6017 trace_block_bio_complete(bdev_get_queue(raid_bio
->bi_bdev
),
6019 bio_endio(raid_bio
);
6021 if (atomic_dec_and_test(&conf
->active_aligned_reads
))
6022 wake_up(&conf
->wait_for_quiescent
);
6026 static int handle_active_stripes(struct r5conf
*conf
, int group
,
6027 struct r5worker
*worker
,
6028 struct list_head
*temp_inactive_list
)
6030 struct stripe_head
*batch
[MAX_STRIPE_BATCH
], *sh
;
6031 int i
, batch_size
= 0, hash
;
6032 bool release_inactive
= false;
6034 while (batch_size
< MAX_STRIPE_BATCH
&&
6035 (sh
= __get_priority_stripe(conf
, group
)) != NULL
)
6036 batch
[batch_size
++] = sh
;
6038 if (batch_size
== 0) {
6039 for (i
= 0; i
< NR_STRIPE_HASH_LOCKS
; i
++)
6040 if (!list_empty(temp_inactive_list
+ i
))
6042 if (i
== NR_STRIPE_HASH_LOCKS
) {
6043 spin_unlock_irq(&conf
->device_lock
);
6044 r5l_flush_stripe_to_raid(conf
->log
);
6045 spin_lock_irq(&conf
->device_lock
);
6048 release_inactive
= true;
6050 spin_unlock_irq(&conf
->device_lock
);
6052 release_inactive_stripe_list(conf
, temp_inactive_list
,
6053 NR_STRIPE_HASH_LOCKS
);
6055 r5l_flush_stripe_to_raid(conf
->log
);
6056 if (release_inactive
) {
6057 spin_lock_irq(&conf
->device_lock
);
6061 for (i
= 0; i
< batch_size
; i
++)
6062 handle_stripe(batch
[i
]);
6063 r5l_write_stripe_run(conf
->log
);
6067 spin_lock_irq(&conf
->device_lock
);
6068 for (i
= 0; i
< batch_size
; i
++) {
6069 hash
= batch
[i
]->hash_lock_index
;
6070 __release_stripe(conf
, batch
[i
], &temp_inactive_list
[hash
]);
6075 static void raid5_do_work(struct work_struct
*work
)
6077 struct r5worker
*worker
= container_of(work
, struct r5worker
, work
);
6078 struct r5worker_group
*group
= worker
->group
;
6079 struct r5conf
*conf
= group
->conf
;
6080 int group_id
= group
- conf
->worker_groups
;
6082 struct blk_plug plug
;
6084 pr_debug("+++ raid5worker active\n");
6086 blk_start_plug(&plug
);
6088 spin_lock_irq(&conf
->device_lock
);
6090 int batch_size
, released
;
6092 released
= release_stripe_list(conf
, worker
->temp_inactive_list
);
6094 batch_size
= handle_active_stripes(conf
, group_id
, worker
,
6095 worker
->temp_inactive_list
);
6096 worker
->working
= false;
6097 if (!batch_size
&& !released
)
6099 handled
+= batch_size
;
6101 pr_debug("%d stripes handled\n", handled
);
6103 spin_unlock_irq(&conf
->device_lock
);
6104 blk_finish_plug(&plug
);
6106 pr_debug("--- raid5worker inactive\n");
6110 * This is our raid5 kernel thread.
6112 * We scan the hash table for stripes which can be handled now.
6113 * During the scan, completed stripes are saved for us by the interrupt
6114 * handler, so that they will not have to wait for our next wakeup.
6116 static void raid5d(struct md_thread
*thread
)
6118 struct mddev
*mddev
= thread
->mddev
;
6119 struct r5conf
*conf
= mddev
->private;
6121 struct blk_plug plug
;
6123 pr_debug("+++ raid5d active\n");
6125 md_check_recovery(mddev
);
6127 if (!bio_list_empty(&conf
->return_bi
) &&
6128 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
)) {
6129 struct bio_list tmp
= BIO_EMPTY_LIST
;
6130 spin_lock_irq(&conf
->device_lock
);
6131 if (!test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
)) {
6132 bio_list_merge(&tmp
, &conf
->return_bi
);
6133 bio_list_init(&conf
->return_bi
);
6135 spin_unlock_irq(&conf
->device_lock
);
6139 blk_start_plug(&plug
);
6141 spin_lock_irq(&conf
->device_lock
);
6144 int batch_size
, released
;
6146 released
= release_stripe_list(conf
, conf
->temp_inactive_list
);
6148 clear_bit(R5_DID_ALLOC
, &conf
->cache_state
);
6151 !list_empty(&conf
->bitmap_list
)) {
6152 /* Now is a good time to flush some bitmap updates */
6154 spin_unlock_irq(&conf
->device_lock
);
6155 bitmap_unplug(mddev
->bitmap
);
6156 spin_lock_irq(&conf
->device_lock
);
6157 conf
->seq_write
= conf
->seq_flush
;
6158 activate_bit_delay(conf
, conf
->temp_inactive_list
);
6160 raid5_activate_delayed(conf
);
6162 while ((bio
= remove_bio_from_retry(conf
))) {
6164 spin_unlock_irq(&conf
->device_lock
);
6165 ok
= retry_aligned_read(conf
, bio
);
6166 spin_lock_irq(&conf
->device_lock
);
6172 batch_size
= handle_active_stripes(conf
, ANY_GROUP
, NULL
,
6173 conf
->temp_inactive_list
);
6174 if (!batch_size
&& !released
)
6176 handled
+= batch_size
;
6178 if (mddev
->sb_flags
& ~(1 << MD_SB_CHANGE_PENDING
)) {
6179 spin_unlock_irq(&conf
->device_lock
);
6180 md_check_recovery(mddev
);
6181 spin_lock_irq(&conf
->device_lock
);
6184 pr_debug("%d stripes handled\n", handled
);
6186 spin_unlock_irq(&conf
->device_lock
);
6187 if (test_and_clear_bit(R5_ALLOC_MORE
, &conf
->cache_state
) &&
6188 mutex_trylock(&conf
->cache_size_mutex
)) {
6189 grow_one_stripe(conf
, __GFP_NOWARN
);
6190 /* Set flag even if allocation failed. This helps
6191 * slow down allocation requests when mem is short
6193 set_bit(R5_DID_ALLOC
, &conf
->cache_state
);
6194 mutex_unlock(&conf
->cache_size_mutex
);
6197 flush_deferred_bios(conf
);
6199 r5l_flush_stripe_to_raid(conf
->log
);
6201 async_tx_issue_pending_all();
6202 blk_finish_plug(&plug
);
6204 pr_debug("--- raid5d inactive\n");
6208 raid5_show_stripe_cache_size(struct mddev
*mddev
, char *page
)
6210 struct r5conf
*conf
;
6212 spin_lock(&mddev
->lock
);
6213 conf
= mddev
->private;
6215 ret
= sprintf(page
, "%d\n", conf
->min_nr_stripes
);
6216 spin_unlock(&mddev
->lock
);
6221 raid5_set_cache_size(struct mddev
*mddev
, int size
)
6223 struct r5conf
*conf
= mddev
->private;
6226 if (size
<= 16 || size
> 32768)
6229 conf
->min_nr_stripes
= size
;
6230 mutex_lock(&conf
->cache_size_mutex
);
6231 while (size
< conf
->max_nr_stripes
&&
6232 drop_one_stripe(conf
))
6234 mutex_unlock(&conf
->cache_size_mutex
);
6237 err
= md_allow_write(mddev
);
6241 mutex_lock(&conf
->cache_size_mutex
);
6242 while (size
> conf
->max_nr_stripes
)
6243 if (!grow_one_stripe(conf
, GFP_KERNEL
))
6245 mutex_unlock(&conf
->cache_size_mutex
);
6249 EXPORT_SYMBOL(raid5_set_cache_size
);
6252 raid5_store_stripe_cache_size(struct mddev
*mddev
, const char *page
, size_t len
)
6254 struct r5conf
*conf
;
6258 if (len
>= PAGE_SIZE
)
6260 if (kstrtoul(page
, 10, &new))
6262 err
= mddev_lock(mddev
);
6265 conf
= mddev
->private;
6269 err
= raid5_set_cache_size(mddev
, new);
6270 mddev_unlock(mddev
);
6275 static struct md_sysfs_entry
6276 raid5_stripecache_size
= __ATTR(stripe_cache_size
, S_IRUGO
| S_IWUSR
,
6277 raid5_show_stripe_cache_size
,
6278 raid5_store_stripe_cache_size
);
6281 raid5_show_rmw_level(struct mddev
*mddev
, char *page
)
6283 struct r5conf
*conf
= mddev
->private;
6285 return sprintf(page
, "%d\n", conf
->rmw_level
);
6291 raid5_store_rmw_level(struct mddev
*mddev
, const char *page
, size_t len
)
6293 struct r5conf
*conf
= mddev
->private;
6299 if (len
>= PAGE_SIZE
)
6302 if (kstrtoul(page
, 10, &new))
6305 if (new != PARITY_DISABLE_RMW
&& !raid6_call
.xor_syndrome
)
6308 if (new != PARITY_DISABLE_RMW
&&
6309 new != PARITY_ENABLE_RMW
&&
6310 new != PARITY_PREFER_RMW
)
6313 conf
->rmw_level
= new;
6317 static struct md_sysfs_entry
6318 raid5_rmw_level
= __ATTR(rmw_level
, S_IRUGO
| S_IWUSR
,
6319 raid5_show_rmw_level
,
6320 raid5_store_rmw_level
);
6324 raid5_show_preread_threshold(struct mddev
*mddev
, char *page
)
6326 struct r5conf
*conf
;
6328 spin_lock(&mddev
->lock
);
6329 conf
= mddev
->private;
6331 ret
= sprintf(page
, "%d\n", conf
->bypass_threshold
);
6332 spin_unlock(&mddev
->lock
);
6337 raid5_store_preread_threshold(struct mddev
*mddev
, const char *page
, size_t len
)
6339 struct r5conf
*conf
;
6343 if (len
>= PAGE_SIZE
)
6345 if (kstrtoul(page
, 10, &new))
6348 err
= mddev_lock(mddev
);
6351 conf
= mddev
->private;
6354 else if (new > conf
->min_nr_stripes
)
6357 conf
->bypass_threshold
= new;
6358 mddev_unlock(mddev
);
6362 static struct md_sysfs_entry
6363 raid5_preread_bypass_threshold
= __ATTR(preread_bypass_threshold
,
6365 raid5_show_preread_threshold
,
6366 raid5_store_preread_threshold
);
6369 raid5_show_skip_copy(struct mddev
*mddev
, char *page
)
6371 struct r5conf
*conf
;
6373 spin_lock(&mddev
->lock
);
6374 conf
= mddev
->private;
6376 ret
= sprintf(page
, "%d\n", conf
->skip_copy
);
6377 spin_unlock(&mddev
->lock
);
6382 raid5_store_skip_copy(struct mddev
*mddev
, const char *page
, size_t len
)
6384 struct r5conf
*conf
;
6388 if (len
>= PAGE_SIZE
)
6390 if (kstrtoul(page
, 10, &new))
6394 err
= mddev_lock(mddev
);
6397 conf
= mddev
->private;
6400 else if (new != conf
->skip_copy
) {
6401 mddev_suspend(mddev
);
6402 conf
->skip_copy
= new;
6404 mddev
->queue
->backing_dev_info
->capabilities
|=
6405 BDI_CAP_STABLE_WRITES
;
6407 mddev
->queue
->backing_dev_info
->capabilities
&=
6408 ~BDI_CAP_STABLE_WRITES
;
6409 mddev_resume(mddev
);
6411 mddev_unlock(mddev
);
6415 static struct md_sysfs_entry
6416 raid5_skip_copy
= __ATTR(skip_copy
, S_IRUGO
| S_IWUSR
,
6417 raid5_show_skip_copy
,
6418 raid5_store_skip_copy
);
6421 stripe_cache_active_show(struct mddev
*mddev
, char *page
)
6423 struct r5conf
*conf
= mddev
->private;
6425 return sprintf(page
, "%d\n", atomic_read(&conf
->active_stripes
));
6430 static struct md_sysfs_entry
6431 raid5_stripecache_active
= __ATTR_RO(stripe_cache_active
);
6434 raid5_show_group_thread_cnt(struct mddev
*mddev
, char *page
)
6436 struct r5conf
*conf
;
6438 spin_lock(&mddev
->lock
);
6439 conf
= mddev
->private;
6441 ret
= sprintf(page
, "%d\n", conf
->worker_cnt_per_group
);
6442 spin_unlock(&mddev
->lock
);
6446 static int alloc_thread_groups(struct r5conf
*conf
, int cnt
,
6448 int *worker_cnt_per_group
,
6449 struct r5worker_group
**worker_groups
);
6451 raid5_store_group_thread_cnt(struct mddev
*mddev
, const char *page
, size_t len
)
6453 struct r5conf
*conf
;
6456 struct r5worker_group
*new_groups
, *old_groups
;
6457 int group_cnt
, worker_cnt_per_group
;
6459 if (len
>= PAGE_SIZE
)
6461 if (kstrtoul(page
, 10, &new))
6464 err
= mddev_lock(mddev
);
6467 conf
= mddev
->private;
6470 else if (new != conf
->worker_cnt_per_group
) {
6471 mddev_suspend(mddev
);
6473 old_groups
= conf
->worker_groups
;
6475 flush_workqueue(raid5_wq
);
6477 err
= alloc_thread_groups(conf
, new,
6478 &group_cnt
, &worker_cnt_per_group
,
6481 spin_lock_irq(&conf
->device_lock
);
6482 conf
->group_cnt
= group_cnt
;
6483 conf
->worker_cnt_per_group
= worker_cnt_per_group
;
6484 conf
->worker_groups
= new_groups
;
6485 spin_unlock_irq(&conf
->device_lock
);
6488 kfree(old_groups
[0].workers
);
6491 mddev_resume(mddev
);
6493 mddev_unlock(mddev
);
6498 static struct md_sysfs_entry
6499 raid5_group_thread_cnt
= __ATTR(group_thread_cnt
, S_IRUGO
| S_IWUSR
,
6500 raid5_show_group_thread_cnt
,
6501 raid5_store_group_thread_cnt
);
6503 static struct attribute
*raid5_attrs
[] = {
6504 &raid5_stripecache_size
.attr
,
6505 &raid5_stripecache_active
.attr
,
6506 &raid5_preread_bypass_threshold
.attr
,
6507 &raid5_group_thread_cnt
.attr
,
6508 &raid5_skip_copy
.attr
,
6509 &raid5_rmw_level
.attr
,
6510 &r5c_journal_mode
.attr
,
6513 static struct attribute_group raid5_attrs_group
= {
6515 .attrs
= raid5_attrs
,
6518 static int alloc_thread_groups(struct r5conf
*conf
, int cnt
,
6520 int *worker_cnt_per_group
,
6521 struct r5worker_group
**worker_groups
)
6525 struct r5worker
*workers
;
6527 *worker_cnt_per_group
= cnt
;
6530 *worker_groups
= NULL
;
6533 *group_cnt
= num_possible_nodes();
6534 size
= sizeof(struct r5worker
) * cnt
;
6535 workers
= kzalloc(size
* *group_cnt
, GFP_NOIO
);
6536 *worker_groups
= kzalloc(sizeof(struct r5worker_group
) *
6537 *group_cnt
, GFP_NOIO
);
6538 if (!*worker_groups
|| !workers
) {
6540 kfree(*worker_groups
);
6544 for (i
= 0; i
< *group_cnt
; i
++) {
6545 struct r5worker_group
*group
;
6547 group
= &(*worker_groups
)[i
];
6548 INIT_LIST_HEAD(&group
->handle_list
);
6550 group
->workers
= workers
+ i
* cnt
;
6552 for (j
= 0; j
< cnt
; j
++) {
6553 struct r5worker
*worker
= group
->workers
+ j
;
6554 worker
->group
= group
;
6555 INIT_WORK(&worker
->work
, raid5_do_work
);
6557 for (k
= 0; k
< NR_STRIPE_HASH_LOCKS
; k
++)
6558 INIT_LIST_HEAD(worker
->temp_inactive_list
+ k
);
6565 static void free_thread_groups(struct r5conf
*conf
)
6567 if (conf
->worker_groups
)
6568 kfree(conf
->worker_groups
[0].workers
);
6569 kfree(conf
->worker_groups
);
6570 conf
->worker_groups
= NULL
;
6574 raid5_size(struct mddev
*mddev
, sector_t sectors
, int raid_disks
)
6576 struct r5conf
*conf
= mddev
->private;
6579 sectors
= mddev
->dev_sectors
;
6581 /* size is defined by the smallest of previous and new size */
6582 raid_disks
= min(conf
->raid_disks
, conf
->previous_raid_disks
);
6584 sectors
&= ~((sector_t
)conf
->chunk_sectors
- 1);
6585 sectors
&= ~((sector_t
)conf
->prev_chunk_sectors
- 1);
6586 return sectors
* (raid_disks
- conf
->max_degraded
);
6589 static void free_scratch_buffer(struct r5conf
*conf
, struct raid5_percpu
*percpu
)
6591 safe_put_page(percpu
->spare_page
);
6592 if (percpu
->scribble
)
6593 flex_array_free(percpu
->scribble
);
6594 percpu
->spare_page
= NULL
;
6595 percpu
->scribble
= NULL
;
6598 static int alloc_scratch_buffer(struct r5conf
*conf
, struct raid5_percpu
*percpu
)
6600 if (conf
->level
== 6 && !percpu
->spare_page
)
6601 percpu
->spare_page
= alloc_page(GFP_KERNEL
);
6602 if (!percpu
->scribble
)
6603 percpu
->scribble
= scribble_alloc(max(conf
->raid_disks
,
6604 conf
->previous_raid_disks
),
6605 max(conf
->chunk_sectors
,
6606 conf
->prev_chunk_sectors
)
6610 if (!percpu
->scribble
|| (conf
->level
== 6 && !percpu
->spare_page
)) {
6611 free_scratch_buffer(conf
, percpu
);
6618 static int raid456_cpu_dead(unsigned int cpu
, struct hlist_node
*node
)
6620 struct r5conf
*conf
= hlist_entry_safe(node
, struct r5conf
, node
);
6622 free_scratch_buffer(conf
, per_cpu_ptr(conf
->percpu
, cpu
));
6626 static void raid5_free_percpu(struct r5conf
*conf
)
6631 cpuhp_state_remove_instance(CPUHP_MD_RAID5_PREPARE
, &conf
->node
);
6632 free_percpu(conf
->percpu
);
6635 static void free_conf(struct r5conf
*conf
)
6640 r5l_exit_log(conf
->log
);
6641 if (conf
->shrinker
.nr_deferred
)
6642 unregister_shrinker(&conf
->shrinker
);
6644 free_thread_groups(conf
);
6645 shrink_stripes(conf
);
6646 raid5_free_percpu(conf
);
6647 for (i
= 0; i
< conf
->pool_size
; i
++)
6648 if (conf
->disks
[i
].extra_page
)
6649 put_page(conf
->disks
[i
].extra_page
);
6651 kfree(conf
->stripe_hashtbl
);
6655 static int raid456_cpu_up_prepare(unsigned int cpu
, struct hlist_node
*node
)
6657 struct r5conf
*conf
= hlist_entry_safe(node
, struct r5conf
, node
);
6658 struct raid5_percpu
*percpu
= per_cpu_ptr(conf
->percpu
, cpu
);
6660 if (alloc_scratch_buffer(conf
, percpu
)) {
6661 pr_warn("%s: failed memory allocation for cpu%u\n",
6668 static int raid5_alloc_percpu(struct r5conf
*conf
)
6672 conf
->percpu
= alloc_percpu(struct raid5_percpu
);
6676 err
= cpuhp_state_add_instance(CPUHP_MD_RAID5_PREPARE
, &conf
->node
);
6678 conf
->scribble_disks
= max(conf
->raid_disks
,
6679 conf
->previous_raid_disks
);
6680 conf
->scribble_sectors
= max(conf
->chunk_sectors
,
6681 conf
->prev_chunk_sectors
);
6686 static unsigned long raid5_cache_scan(struct shrinker
*shrink
,
6687 struct shrink_control
*sc
)
6689 struct r5conf
*conf
= container_of(shrink
, struct r5conf
, shrinker
);
6690 unsigned long ret
= SHRINK_STOP
;
6692 if (mutex_trylock(&conf
->cache_size_mutex
)) {
6694 while (ret
< sc
->nr_to_scan
&&
6695 conf
->max_nr_stripes
> conf
->min_nr_stripes
) {
6696 if (drop_one_stripe(conf
) == 0) {
6702 mutex_unlock(&conf
->cache_size_mutex
);
6707 static unsigned long raid5_cache_count(struct shrinker
*shrink
,
6708 struct shrink_control
*sc
)
6710 struct r5conf
*conf
= container_of(shrink
, struct r5conf
, shrinker
);
6712 if (conf
->max_nr_stripes
< conf
->min_nr_stripes
)
6713 /* unlikely, but not impossible */
6715 return conf
->max_nr_stripes
- conf
->min_nr_stripes
;
6718 static struct r5conf
*setup_conf(struct mddev
*mddev
)
6720 struct r5conf
*conf
;
6721 int raid_disk
, memory
, max_disks
;
6722 struct md_rdev
*rdev
;
6723 struct disk_info
*disk
;
6726 int group_cnt
, worker_cnt_per_group
;
6727 struct r5worker_group
*new_group
;
6729 if (mddev
->new_level
!= 5
6730 && mddev
->new_level
!= 4
6731 && mddev
->new_level
!= 6) {
6732 pr_warn("md/raid:%s: raid level not set to 4/5/6 (%d)\n",
6733 mdname(mddev
), mddev
->new_level
);
6734 return ERR_PTR(-EIO
);
6736 if ((mddev
->new_level
== 5
6737 && !algorithm_valid_raid5(mddev
->new_layout
)) ||
6738 (mddev
->new_level
== 6
6739 && !algorithm_valid_raid6(mddev
->new_layout
))) {
6740 pr_warn("md/raid:%s: layout %d not supported\n",
6741 mdname(mddev
), mddev
->new_layout
);
6742 return ERR_PTR(-EIO
);
6744 if (mddev
->new_level
== 6 && mddev
->raid_disks
< 4) {
6745 pr_warn("md/raid:%s: not enough configured devices (%d, minimum 4)\n",
6746 mdname(mddev
), mddev
->raid_disks
);
6747 return ERR_PTR(-EINVAL
);
6750 if (!mddev
->new_chunk_sectors
||
6751 (mddev
->new_chunk_sectors
<< 9) % PAGE_SIZE
||
6752 !is_power_of_2(mddev
->new_chunk_sectors
)) {
6753 pr_warn("md/raid:%s: invalid chunk size %d\n",
6754 mdname(mddev
), mddev
->new_chunk_sectors
<< 9);
6755 return ERR_PTR(-EINVAL
);
6758 conf
= kzalloc(sizeof(struct r5conf
), GFP_KERNEL
);
6761 /* Don't enable multi-threading by default*/
6762 if (!alloc_thread_groups(conf
, 0, &group_cnt
, &worker_cnt_per_group
,
6764 conf
->group_cnt
= group_cnt
;
6765 conf
->worker_cnt_per_group
= worker_cnt_per_group
;
6766 conf
->worker_groups
= new_group
;
6769 spin_lock_init(&conf
->device_lock
);
6770 seqcount_init(&conf
->gen_lock
);
6771 mutex_init(&conf
->cache_size_mutex
);
6772 init_waitqueue_head(&conf
->wait_for_quiescent
);
6773 init_waitqueue_head(&conf
->wait_for_stripe
);
6774 init_waitqueue_head(&conf
->wait_for_overlap
);
6775 INIT_LIST_HEAD(&conf
->handle_list
);
6776 INIT_LIST_HEAD(&conf
->hold_list
);
6777 INIT_LIST_HEAD(&conf
->delayed_list
);
6778 INIT_LIST_HEAD(&conf
->bitmap_list
);
6779 bio_list_init(&conf
->return_bi
);
6780 init_llist_head(&conf
->released_stripes
);
6781 atomic_set(&conf
->active_stripes
, 0);
6782 atomic_set(&conf
->preread_active_stripes
, 0);
6783 atomic_set(&conf
->active_aligned_reads
, 0);
6784 bio_list_init(&conf
->pending_bios
);
6785 spin_lock_init(&conf
->pending_bios_lock
);
6786 conf
->batch_bio_dispatch
= true;
6787 rdev_for_each(rdev
, mddev
) {
6788 if (test_bit(Journal
, &rdev
->flags
))
6790 if (blk_queue_nonrot(bdev_get_queue(rdev
->bdev
))) {
6791 conf
->batch_bio_dispatch
= false;
6796 conf
->bypass_threshold
= BYPASS_THRESHOLD
;
6797 conf
->recovery_disabled
= mddev
->recovery_disabled
- 1;
6799 conf
->raid_disks
= mddev
->raid_disks
;
6800 if (mddev
->reshape_position
== MaxSector
)
6801 conf
->previous_raid_disks
= mddev
->raid_disks
;
6803 conf
->previous_raid_disks
= mddev
->raid_disks
- mddev
->delta_disks
;
6804 max_disks
= max(conf
->raid_disks
, conf
->previous_raid_disks
);
6806 conf
->disks
= kzalloc(max_disks
* sizeof(struct disk_info
),
6812 for (i
= 0; i
< max_disks
; i
++) {
6813 conf
->disks
[i
].extra_page
= alloc_page(GFP_KERNEL
);
6814 if (!conf
->disks
[i
].extra_page
)
6818 conf
->mddev
= mddev
;
6820 if ((conf
->stripe_hashtbl
= kzalloc(PAGE_SIZE
, GFP_KERNEL
)) == NULL
)
6823 /* We init hash_locks[0] separately to that it can be used
6824 * as the reference lock in the spin_lock_nest_lock() call
6825 * in lock_all_device_hash_locks_irq in order to convince
6826 * lockdep that we know what we are doing.
6828 spin_lock_init(conf
->hash_locks
);
6829 for (i
= 1; i
< NR_STRIPE_HASH_LOCKS
; i
++)
6830 spin_lock_init(conf
->hash_locks
+ i
);
6832 for (i
= 0; i
< NR_STRIPE_HASH_LOCKS
; i
++)
6833 INIT_LIST_HEAD(conf
->inactive_list
+ i
);
6835 for (i
= 0; i
< NR_STRIPE_HASH_LOCKS
; i
++)
6836 INIT_LIST_HEAD(conf
->temp_inactive_list
+ i
);
6838 atomic_set(&conf
->r5c_cached_full_stripes
, 0);
6839 INIT_LIST_HEAD(&conf
->r5c_full_stripe_list
);
6840 atomic_set(&conf
->r5c_cached_partial_stripes
, 0);
6841 INIT_LIST_HEAD(&conf
->r5c_partial_stripe_list
);
6842 atomic_set(&conf
->r5c_flushing_full_stripes
, 0);
6843 atomic_set(&conf
->r5c_flushing_partial_stripes
, 0);
6845 conf
->level
= mddev
->new_level
;
6846 conf
->chunk_sectors
= mddev
->new_chunk_sectors
;
6847 if (raid5_alloc_percpu(conf
) != 0)
6850 pr_debug("raid456: run(%s) called.\n", mdname(mddev
));
6852 rdev_for_each(rdev
, mddev
) {
6853 raid_disk
= rdev
->raid_disk
;
6854 if (raid_disk
>= max_disks
6855 || raid_disk
< 0 || test_bit(Journal
, &rdev
->flags
))
6857 disk
= conf
->disks
+ raid_disk
;
6859 if (test_bit(Replacement
, &rdev
->flags
)) {
6860 if (disk
->replacement
)
6862 disk
->replacement
= rdev
;
6869 if (test_bit(In_sync
, &rdev
->flags
)) {
6870 char b
[BDEVNAME_SIZE
];
6871 pr_info("md/raid:%s: device %s operational as raid disk %d\n",
6872 mdname(mddev
), bdevname(rdev
->bdev
, b
), raid_disk
);
6873 } else if (rdev
->saved_raid_disk
!= raid_disk
)
6874 /* Cannot rely on bitmap to complete recovery */
6878 conf
->level
= mddev
->new_level
;
6879 if (conf
->level
== 6) {
6880 conf
->max_degraded
= 2;
6881 if (raid6_call
.xor_syndrome
)
6882 conf
->rmw_level
= PARITY_ENABLE_RMW
;
6884 conf
->rmw_level
= PARITY_DISABLE_RMW
;
6886 conf
->max_degraded
= 1;
6887 conf
->rmw_level
= PARITY_ENABLE_RMW
;
6889 conf
->algorithm
= mddev
->new_layout
;
6890 conf
->reshape_progress
= mddev
->reshape_position
;
6891 if (conf
->reshape_progress
!= MaxSector
) {
6892 conf
->prev_chunk_sectors
= mddev
->chunk_sectors
;
6893 conf
->prev_algo
= mddev
->layout
;
6895 conf
->prev_chunk_sectors
= conf
->chunk_sectors
;
6896 conf
->prev_algo
= conf
->algorithm
;
6899 conf
->min_nr_stripes
= NR_STRIPES
;
6900 if (mddev
->reshape_position
!= MaxSector
) {
6901 int stripes
= max_t(int,
6902 ((mddev
->chunk_sectors
<< 9) / STRIPE_SIZE
) * 4,
6903 ((mddev
->new_chunk_sectors
<< 9) / STRIPE_SIZE
) * 4);
6904 conf
->min_nr_stripes
= max(NR_STRIPES
, stripes
);
6905 if (conf
->min_nr_stripes
!= NR_STRIPES
)
6906 pr_info("md/raid:%s: force stripe size %d for reshape\n",
6907 mdname(mddev
), conf
->min_nr_stripes
);
6909 memory
= conf
->min_nr_stripes
* (sizeof(struct stripe_head
) +
6910 max_disks
* ((sizeof(struct bio
) + PAGE_SIZE
))) / 1024;
6911 atomic_set(&conf
->empty_inactive_list_nr
, NR_STRIPE_HASH_LOCKS
);
6912 if (grow_stripes(conf
, conf
->min_nr_stripes
)) {
6913 pr_warn("md/raid:%s: couldn't allocate %dkB for buffers\n",
6914 mdname(mddev
), memory
);
6917 pr_debug("md/raid:%s: allocated %dkB\n", mdname(mddev
), memory
);
6919 * Losing a stripe head costs more than the time to refill it,
6920 * it reduces the queue depth and so can hurt throughput.
6921 * So set it rather large, scaled by number of devices.
6923 conf
->shrinker
.seeks
= DEFAULT_SEEKS
* conf
->raid_disks
* 4;
6924 conf
->shrinker
.scan_objects
= raid5_cache_scan
;
6925 conf
->shrinker
.count_objects
= raid5_cache_count
;
6926 conf
->shrinker
.batch
= 128;
6927 conf
->shrinker
.flags
= 0;
6928 if (register_shrinker(&conf
->shrinker
)) {
6929 pr_warn("md/raid:%s: couldn't register shrinker.\n",
6934 sprintf(pers_name
, "raid%d", mddev
->new_level
);
6935 conf
->thread
= md_register_thread(raid5d
, mddev
, pers_name
);
6936 if (!conf
->thread
) {
6937 pr_warn("md/raid:%s: couldn't allocate thread.\n",
6947 return ERR_PTR(-EIO
);
6949 return ERR_PTR(-ENOMEM
);
6952 static int only_parity(int raid_disk
, int algo
, int raid_disks
, int max_degraded
)
6955 case ALGORITHM_PARITY_0
:
6956 if (raid_disk
< max_degraded
)
6959 case ALGORITHM_PARITY_N
:
6960 if (raid_disk
>= raid_disks
- max_degraded
)
6963 case ALGORITHM_PARITY_0_6
:
6964 if (raid_disk
== 0 ||
6965 raid_disk
== raid_disks
- 1)
6968 case ALGORITHM_LEFT_ASYMMETRIC_6
:
6969 case ALGORITHM_RIGHT_ASYMMETRIC_6
:
6970 case ALGORITHM_LEFT_SYMMETRIC_6
:
6971 case ALGORITHM_RIGHT_SYMMETRIC_6
:
6972 if (raid_disk
== raid_disks
- 1)
6978 static int raid5_run(struct mddev
*mddev
)
6980 struct r5conf
*conf
;
6981 int working_disks
= 0;
6982 int dirty_parity_disks
= 0;
6983 struct md_rdev
*rdev
;
6984 struct md_rdev
*journal_dev
= NULL
;
6985 sector_t reshape_offset
= 0;
6987 long long min_offset_diff
= 0;
6990 if (mddev
->recovery_cp
!= MaxSector
)
6991 pr_notice("md/raid:%s: not clean -- starting background reconstruction\n",
6994 rdev_for_each(rdev
, mddev
) {
6997 if (test_bit(Journal
, &rdev
->flags
)) {
7001 if (rdev
->raid_disk
< 0)
7003 diff
= (rdev
->new_data_offset
- rdev
->data_offset
);
7005 min_offset_diff
= diff
;
7007 } else if (mddev
->reshape_backwards
&&
7008 diff
< min_offset_diff
)
7009 min_offset_diff
= diff
;
7010 else if (!mddev
->reshape_backwards
&&
7011 diff
> min_offset_diff
)
7012 min_offset_diff
= diff
;
7015 if (mddev
->reshape_position
!= MaxSector
) {
7016 /* Check that we can continue the reshape.
7017 * Difficulties arise if the stripe we would write to
7018 * next is at or after the stripe we would read from next.
7019 * For a reshape that changes the number of devices, this
7020 * is only possible for a very short time, and mdadm makes
7021 * sure that time appears to have past before assembling
7022 * the array. So we fail if that time hasn't passed.
7023 * For a reshape that keeps the number of devices the same
7024 * mdadm must be monitoring the reshape can keeping the
7025 * critical areas read-only and backed up. It will start
7026 * the array in read-only mode, so we check for that.
7028 sector_t here_new
, here_old
;
7030 int max_degraded
= (mddev
->level
== 6 ? 2 : 1);
7035 pr_warn("md/raid:%s: don't support reshape with journal - aborting.\n",
7040 if (mddev
->new_level
!= mddev
->level
) {
7041 pr_warn("md/raid:%s: unsupported reshape required - aborting.\n",
7045 old_disks
= mddev
->raid_disks
- mddev
->delta_disks
;
7046 /* reshape_position must be on a new-stripe boundary, and one
7047 * further up in new geometry must map after here in old
7049 * If the chunk sizes are different, then as we perform reshape
7050 * in units of the largest of the two, reshape_position needs
7051 * be a multiple of the largest chunk size times new data disks.
7053 here_new
= mddev
->reshape_position
;
7054 chunk_sectors
= max(mddev
->chunk_sectors
, mddev
->new_chunk_sectors
);
7055 new_data_disks
= mddev
->raid_disks
- max_degraded
;
7056 if (sector_div(here_new
, chunk_sectors
* new_data_disks
)) {
7057 pr_warn("md/raid:%s: reshape_position not on a stripe boundary\n",
7061 reshape_offset
= here_new
* chunk_sectors
;
7062 /* here_new is the stripe we will write to */
7063 here_old
= mddev
->reshape_position
;
7064 sector_div(here_old
, chunk_sectors
* (old_disks
-max_degraded
));
7065 /* here_old is the first stripe that we might need to read
7067 if (mddev
->delta_disks
== 0) {
7068 /* We cannot be sure it is safe to start an in-place
7069 * reshape. It is only safe if user-space is monitoring
7070 * and taking constant backups.
7071 * mdadm always starts a situation like this in
7072 * readonly mode so it can take control before
7073 * allowing any writes. So just check for that.
7075 if (abs(min_offset_diff
) >= mddev
->chunk_sectors
&&
7076 abs(min_offset_diff
) >= mddev
->new_chunk_sectors
)
7077 /* not really in-place - so OK */;
7078 else if (mddev
->ro
== 0) {
7079 pr_warn("md/raid:%s: in-place reshape must be started in read-only mode - aborting\n",
7083 } else if (mddev
->reshape_backwards
7084 ? (here_new
* chunk_sectors
+ min_offset_diff
<=
7085 here_old
* chunk_sectors
)
7086 : (here_new
* chunk_sectors
>=
7087 here_old
* chunk_sectors
+ (-min_offset_diff
))) {
7088 /* Reading from the same stripe as writing to - bad */
7089 pr_warn("md/raid:%s: reshape_position too early for auto-recovery - aborting.\n",
7093 pr_debug("md/raid:%s: reshape will continue\n", mdname(mddev
));
7094 /* OK, we should be able to continue; */
7096 BUG_ON(mddev
->level
!= mddev
->new_level
);
7097 BUG_ON(mddev
->layout
!= mddev
->new_layout
);
7098 BUG_ON(mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
);
7099 BUG_ON(mddev
->delta_disks
!= 0);
7102 if (mddev
->private == NULL
)
7103 conf
= setup_conf(mddev
);
7105 conf
= mddev
->private;
7108 return PTR_ERR(conf
);
7110 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
7112 pr_warn("md/raid:%s: journal disk is missing, force array readonly\n",
7115 set_disk_ro(mddev
->gendisk
, 1);
7116 } else if (mddev
->recovery_cp
== MaxSector
)
7117 set_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
);
7120 conf
->min_offset_diff
= min_offset_diff
;
7121 mddev
->thread
= conf
->thread
;
7122 conf
->thread
= NULL
;
7123 mddev
->private = conf
;
7125 for (i
= 0; i
< conf
->raid_disks
&& conf
->previous_raid_disks
;
7127 rdev
= conf
->disks
[i
].rdev
;
7128 if (!rdev
&& conf
->disks
[i
].replacement
) {
7129 /* The replacement is all we have yet */
7130 rdev
= conf
->disks
[i
].replacement
;
7131 conf
->disks
[i
].replacement
= NULL
;
7132 clear_bit(Replacement
, &rdev
->flags
);
7133 conf
->disks
[i
].rdev
= rdev
;
7137 if (conf
->disks
[i
].replacement
&&
7138 conf
->reshape_progress
!= MaxSector
) {
7139 /* replacements and reshape simply do not mix. */
7140 pr_warn("md: cannot handle concurrent replacement and reshape.\n");
7143 if (test_bit(In_sync
, &rdev
->flags
)) {
7147 /* This disc is not fully in-sync. However if it
7148 * just stored parity (beyond the recovery_offset),
7149 * when we don't need to be concerned about the
7150 * array being dirty.
7151 * When reshape goes 'backwards', we never have
7152 * partially completed devices, so we only need
7153 * to worry about reshape going forwards.
7155 /* Hack because v0.91 doesn't store recovery_offset properly. */
7156 if (mddev
->major_version
== 0 &&
7157 mddev
->minor_version
> 90)
7158 rdev
->recovery_offset
= reshape_offset
;
7160 if (rdev
->recovery_offset
< reshape_offset
) {
7161 /* We need to check old and new layout */
7162 if (!only_parity(rdev
->raid_disk
,
7165 conf
->max_degraded
))
7168 if (!only_parity(rdev
->raid_disk
,
7170 conf
->previous_raid_disks
,
7171 conf
->max_degraded
))
7173 dirty_parity_disks
++;
7177 * 0 for a fully functional array, 1 or 2 for a degraded array.
7179 mddev
->degraded
= raid5_calc_degraded(conf
);
7181 if (has_failed(conf
)) {
7182 pr_crit("md/raid:%s: not enough operational devices (%d/%d failed)\n",
7183 mdname(mddev
), mddev
->degraded
, conf
->raid_disks
);
7187 /* device size must be a multiple of chunk size */
7188 mddev
->dev_sectors
&= ~(mddev
->chunk_sectors
- 1);
7189 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
7191 if (mddev
->degraded
> dirty_parity_disks
&&
7192 mddev
->recovery_cp
!= MaxSector
) {
7193 if (mddev
->ok_start_degraded
)
7194 pr_crit("md/raid:%s: starting dirty degraded array - data corruption possible.\n",
7197 pr_crit("md/raid:%s: cannot start dirty degraded array.\n",
7203 pr_info("md/raid:%s: raid level %d active with %d out of %d devices, algorithm %d\n",
7204 mdname(mddev
), conf
->level
,
7205 mddev
->raid_disks
-mddev
->degraded
, mddev
->raid_disks
,
7208 print_raid5_conf(conf
);
7210 if (conf
->reshape_progress
!= MaxSector
) {
7211 conf
->reshape_safe
= conf
->reshape_progress
;
7212 atomic_set(&conf
->reshape_stripes
, 0);
7213 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7214 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7215 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7216 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7217 mddev
->sync_thread
= md_register_thread(md_do_sync
, mddev
,
7221 /* Ok, everything is just fine now */
7222 if (mddev
->to_remove
== &raid5_attrs_group
)
7223 mddev
->to_remove
= NULL
;
7224 else if (mddev
->kobj
.sd
&&
7225 sysfs_create_group(&mddev
->kobj
, &raid5_attrs_group
))
7226 pr_warn("raid5: failed to create sysfs attributes for %s\n",
7228 md_set_array_sectors(mddev
, raid5_size(mddev
, 0, 0));
7232 bool discard_supported
= true;
7233 /* read-ahead size must cover two whole stripes, which
7234 * is 2 * (datadisks) * chunksize where 'n' is the
7235 * number of raid devices
7237 int data_disks
= conf
->previous_raid_disks
- conf
->max_degraded
;
7238 int stripe
= data_disks
*
7239 ((mddev
->chunk_sectors
<< 9) / PAGE_SIZE
);
7240 if (mddev
->queue
->backing_dev_info
->ra_pages
< 2 * stripe
)
7241 mddev
->queue
->backing_dev_info
->ra_pages
= 2 * stripe
;
7243 chunk_size
= mddev
->chunk_sectors
<< 9;
7244 blk_queue_io_min(mddev
->queue
, chunk_size
);
7245 blk_queue_io_opt(mddev
->queue
, chunk_size
*
7246 (conf
->raid_disks
- conf
->max_degraded
));
7247 mddev
->queue
->limits
.raid_partial_stripes_expensive
= 1;
7249 * We can only discard a whole stripe. It doesn't make sense to
7250 * discard data disk but write parity disk
7252 stripe
= stripe
* PAGE_SIZE
;
7253 /* Round up to power of 2, as discard handling
7254 * currently assumes that */
7255 while ((stripe
-1) & stripe
)
7256 stripe
= (stripe
| (stripe
-1)) + 1;
7257 mddev
->queue
->limits
.discard_alignment
= stripe
;
7258 mddev
->queue
->limits
.discard_granularity
= stripe
;
7261 * We use 16-bit counter of active stripes in bi_phys_segments
7262 * (minus one for over-loaded initialization)
7264 blk_queue_max_hw_sectors(mddev
->queue
, 0xfffe * STRIPE_SECTORS
);
7265 blk_queue_max_discard_sectors(mddev
->queue
,
7266 0xfffe * STRIPE_SECTORS
);
7269 * unaligned part of discard request will be ignored, so can't
7270 * guarantee discard_zeroes_data
7272 mddev
->queue
->limits
.discard_zeroes_data
= 0;
7274 blk_queue_max_write_same_sectors(mddev
->queue
, 0);
7276 rdev_for_each(rdev
, mddev
) {
7277 disk_stack_limits(mddev
->gendisk
, rdev
->bdev
,
7278 rdev
->data_offset
<< 9);
7279 disk_stack_limits(mddev
->gendisk
, rdev
->bdev
,
7280 rdev
->new_data_offset
<< 9);
7282 * discard_zeroes_data is required, otherwise data
7283 * could be lost. Consider a scenario: discard a stripe
7284 * (the stripe could be inconsistent if
7285 * discard_zeroes_data is 0); write one disk of the
7286 * stripe (the stripe could be inconsistent again
7287 * depending on which disks are used to calculate
7288 * parity); the disk is broken; The stripe data of this
7291 if (!blk_queue_discard(bdev_get_queue(rdev
->bdev
)) ||
7292 !bdev_get_queue(rdev
->bdev
)->
7293 limits
.discard_zeroes_data
)
7294 discard_supported
= false;
7295 /* Unfortunately, discard_zeroes_data is not currently
7296 * a guarantee - just a hint. So we only allow DISCARD
7297 * if the sysadmin has confirmed that only safe devices
7298 * are in use by setting a module parameter.
7300 if (!devices_handle_discard_safely
) {
7301 if (discard_supported
) {
7302 pr_info("md/raid456: discard support disabled due to uncertainty.\n");
7303 pr_info("Set raid456.devices_handle_discard_safely=Y to override.\n");
7305 discard_supported
= false;
7309 if (discard_supported
&&
7310 mddev
->queue
->limits
.max_discard_sectors
>= (stripe
>> 9) &&
7311 mddev
->queue
->limits
.discard_granularity
>= stripe
)
7312 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
,
7315 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD
,
7318 blk_queue_max_hw_sectors(mddev
->queue
, UINT_MAX
);
7322 char b
[BDEVNAME_SIZE
];
7324 pr_debug("md/raid:%s: using device %s as journal\n",
7325 mdname(mddev
), bdevname(journal_dev
->bdev
, b
));
7326 if (r5l_init_log(conf
, journal_dev
))
7332 md_unregister_thread(&mddev
->thread
);
7333 print_raid5_conf(conf
);
7335 mddev
->private = NULL
;
7336 pr_warn("md/raid:%s: failed to run raid set.\n", mdname(mddev
));
7340 static void raid5_free(struct mddev
*mddev
, void *priv
)
7342 struct r5conf
*conf
= priv
;
7345 mddev
->to_remove
= &raid5_attrs_group
;
7348 static void raid5_status(struct seq_file
*seq
, struct mddev
*mddev
)
7350 struct r5conf
*conf
= mddev
->private;
7353 seq_printf(seq
, " level %d, %dk chunk, algorithm %d", mddev
->level
,
7354 conf
->chunk_sectors
/ 2, mddev
->layout
);
7355 seq_printf (seq
, " [%d/%d] [", conf
->raid_disks
, conf
->raid_disks
- mddev
->degraded
);
7357 for (i
= 0; i
< conf
->raid_disks
; i
++) {
7358 struct md_rdev
*rdev
= rcu_dereference(conf
->disks
[i
].rdev
);
7359 seq_printf (seq
, "%s", rdev
&& test_bit(In_sync
, &rdev
->flags
) ? "U" : "_");
7362 seq_printf (seq
, "]");
7365 static void print_raid5_conf (struct r5conf
*conf
)
7368 struct disk_info
*tmp
;
7370 pr_debug("RAID conf printout:\n");
7372 pr_debug("(conf==NULL)\n");
7375 pr_debug(" --- level:%d rd:%d wd:%d\n", conf
->level
,
7377 conf
->raid_disks
- conf
->mddev
->degraded
);
7379 for (i
= 0; i
< conf
->raid_disks
; i
++) {
7380 char b
[BDEVNAME_SIZE
];
7381 tmp
= conf
->disks
+ i
;
7383 pr_debug(" disk %d, o:%d, dev:%s\n",
7384 i
, !test_bit(Faulty
, &tmp
->rdev
->flags
),
7385 bdevname(tmp
->rdev
->bdev
, b
));
7389 static int raid5_spare_active(struct mddev
*mddev
)
7392 struct r5conf
*conf
= mddev
->private;
7393 struct disk_info
*tmp
;
7395 unsigned long flags
;
7397 for (i
= 0; i
< conf
->raid_disks
; i
++) {
7398 tmp
= conf
->disks
+ i
;
7399 if (tmp
->replacement
7400 && tmp
->replacement
->recovery_offset
== MaxSector
7401 && !test_bit(Faulty
, &tmp
->replacement
->flags
)
7402 && !test_and_set_bit(In_sync
, &tmp
->replacement
->flags
)) {
7403 /* Replacement has just become active. */
7405 || !test_and_clear_bit(In_sync
, &tmp
->rdev
->flags
))
7408 /* Replaced device not technically faulty,
7409 * but we need to be sure it gets removed
7410 * and never re-added.
7412 set_bit(Faulty
, &tmp
->rdev
->flags
);
7413 sysfs_notify_dirent_safe(
7414 tmp
->rdev
->sysfs_state
);
7416 sysfs_notify_dirent_safe(tmp
->replacement
->sysfs_state
);
7417 } else if (tmp
->rdev
7418 && tmp
->rdev
->recovery_offset
== MaxSector
7419 && !test_bit(Faulty
, &tmp
->rdev
->flags
)
7420 && !test_and_set_bit(In_sync
, &tmp
->rdev
->flags
)) {
7422 sysfs_notify_dirent_safe(tmp
->rdev
->sysfs_state
);
7425 spin_lock_irqsave(&conf
->device_lock
, flags
);
7426 mddev
->degraded
= raid5_calc_degraded(conf
);
7427 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
7428 print_raid5_conf(conf
);
7432 static int raid5_remove_disk(struct mddev
*mddev
, struct md_rdev
*rdev
)
7434 struct r5conf
*conf
= mddev
->private;
7436 int number
= rdev
->raid_disk
;
7437 struct md_rdev
**rdevp
;
7438 struct disk_info
*p
= conf
->disks
+ number
;
7440 print_raid5_conf(conf
);
7441 if (test_bit(Journal
, &rdev
->flags
) && conf
->log
) {
7442 struct r5l_log
*log
;
7444 * we can't wait pending write here, as this is called in
7445 * raid5d, wait will deadlock.
7447 if (atomic_read(&mddev
->writes_pending
))
7455 if (rdev
== p
->rdev
)
7457 else if (rdev
== p
->replacement
)
7458 rdevp
= &p
->replacement
;
7462 if (number
>= conf
->raid_disks
&&
7463 conf
->reshape_progress
== MaxSector
)
7464 clear_bit(In_sync
, &rdev
->flags
);
7466 if (test_bit(In_sync
, &rdev
->flags
) ||
7467 atomic_read(&rdev
->nr_pending
)) {
7471 /* Only remove non-faulty devices if recovery
7474 if (!test_bit(Faulty
, &rdev
->flags
) &&
7475 mddev
->recovery_disabled
!= conf
->recovery_disabled
&&
7476 !has_failed(conf
) &&
7477 (!p
->replacement
|| p
->replacement
== rdev
) &&
7478 number
< conf
->raid_disks
) {
7483 if (!test_bit(RemoveSynchronized
, &rdev
->flags
)) {
7485 if (atomic_read(&rdev
->nr_pending
)) {
7486 /* lost the race, try later */
7491 if (p
->replacement
) {
7492 /* We must have just cleared 'rdev' */
7493 p
->rdev
= p
->replacement
;
7494 clear_bit(Replacement
, &p
->replacement
->flags
);
7495 smp_mb(); /* Make sure other CPUs may see both as identical
7496 * but will never see neither - if they are careful
7498 p
->replacement
= NULL
;
7499 clear_bit(WantReplacement
, &rdev
->flags
);
7501 /* We might have just removed the Replacement as faulty-
7502 * clear the bit just in case
7504 clear_bit(WantReplacement
, &rdev
->flags
);
7507 print_raid5_conf(conf
);
7511 static int raid5_add_disk(struct mddev
*mddev
, struct md_rdev
*rdev
)
7513 struct r5conf
*conf
= mddev
->private;
7516 struct disk_info
*p
;
7518 int last
= conf
->raid_disks
- 1;
7520 if (test_bit(Journal
, &rdev
->flags
)) {
7521 char b
[BDEVNAME_SIZE
];
7525 rdev
->raid_disk
= 0;
7527 * The array is in readonly mode if journal is missing, so no
7528 * write requests running. We should be safe
7530 r5l_init_log(conf
, rdev
);
7531 pr_debug("md/raid:%s: using device %s as journal\n",
7532 mdname(mddev
), bdevname(rdev
->bdev
, b
));
7535 if (mddev
->recovery_disabled
== conf
->recovery_disabled
)
7538 if (rdev
->saved_raid_disk
< 0 && has_failed(conf
))
7539 /* no point adding a device */
7542 if (rdev
->raid_disk
>= 0)
7543 first
= last
= rdev
->raid_disk
;
7546 * find the disk ... but prefer rdev->saved_raid_disk
7549 if (rdev
->saved_raid_disk
>= 0 &&
7550 rdev
->saved_raid_disk
>= first
&&
7551 conf
->disks
[rdev
->saved_raid_disk
].rdev
== NULL
)
7552 first
= rdev
->saved_raid_disk
;
7554 for (disk
= first
; disk
<= last
; disk
++) {
7555 p
= conf
->disks
+ disk
;
7556 if (p
->rdev
== NULL
) {
7557 clear_bit(In_sync
, &rdev
->flags
);
7558 rdev
->raid_disk
= disk
;
7560 if (rdev
->saved_raid_disk
!= disk
)
7562 rcu_assign_pointer(p
->rdev
, rdev
);
7566 for (disk
= first
; disk
<= last
; disk
++) {
7567 p
= conf
->disks
+ disk
;
7568 if (test_bit(WantReplacement
, &p
->rdev
->flags
) &&
7569 p
->replacement
== NULL
) {
7570 clear_bit(In_sync
, &rdev
->flags
);
7571 set_bit(Replacement
, &rdev
->flags
);
7572 rdev
->raid_disk
= disk
;
7575 rcu_assign_pointer(p
->replacement
, rdev
);
7580 print_raid5_conf(conf
);
7584 static int raid5_resize(struct mddev
*mddev
, sector_t sectors
)
7586 /* no resync is happening, and there is enough space
7587 * on all devices, so we can resize.
7588 * We need to make sure resync covers any new space.
7589 * If the array is shrinking we should possibly wait until
7590 * any io in the removed space completes, but it hardly seems
7594 struct r5conf
*conf
= mddev
->private;
7598 sectors
&= ~((sector_t
)conf
->chunk_sectors
- 1);
7599 newsize
= raid5_size(mddev
, sectors
, mddev
->raid_disks
);
7600 if (mddev
->external_size
&&
7601 mddev
->array_sectors
> newsize
)
7603 if (mddev
->bitmap
) {
7604 int ret
= bitmap_resize(mddev
->bitmap
, sectors
, 0, 0);
7608 md_set_array_sectors(mddev
, newsize
);
7609 if (sectors
> mddev
->dev_sectors
&&
7610 mddev
->recovery_cp
> mddev
->dev_sectors
) {
7611 mddev
->recovery_cp
= mddev
->dev_sectors
;
7612 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7614 mddev
->dev_sectors
= sectors
;
7615 mddev
->resync_max_sectors
= sectors
;
7619 static int check_stripe_cache(struct mddev
*mddev
)
7621 /* Can only proceed if there are plenty of stripe_heads.
7622 * We need a minimum of one full stripe,, and for sensible progress
7623 * it is best to have about 4 times that.
7624 * If we require 4 times, then the default 256 4K stripe_heads will
7625 * allow for chunk sizes up to 256K, which is probably OK.
7626 * If the chunk size is greater, user-space should request more
7627 * stripe_heads first.
7629 struct r5conf
*conf
= mddev
->private;
7630 if (((mddev
->chunk_sectors
<< 9) / STRIPE_SIZE
) * 4
7631 > conf
->min_nr_stripes
||
7632 ((mddev
->new_chunk_sectors
<< 9) / STRIPE_SIZE
) * 4
7633 > conf
->min_nr_stripes
) {
7634 pr_warn("md/raid:%s: reshape: not enough stripes. Needed %lu\n",
7636 ((max(mddev
->chunk_sectors
, mddev
->new_chunk_sectors
) << 9)
7643 static int check_reshape(struct mddev
*mddev
)
7645 struct r5conf
*conf
= mddev
->private;
7649 if (mddev
->delta_disks
== 0 &&
7650 mddev
->new_layout
== mddev
->layout
&&
7651 mddev
->new_chunk_sectors
== mddev
->chunk_sectors
)
7652 return 0; /* nothing to do */
7653 if (has_failed(conf
))
7655 if (mddev
->delta_disks
< 0 && mddev
->reshape_position
== MaxSector
) {
7656 /* We might be able to shrink, but the devices must
7657 * be made bigger first.
7658 * For raid6, 4 is the minimum size.
7659 * Otherwise 2 is the minimum
7662 if (mddev
->level
== 6)
7664 if (mddev
->raid_disks
+ mddev
->delta_disks
< min
)
7668 if (!check_stripe_cache(mddev
))
7671 if (mddev
->new_chunk_sectors
> mddev
->chunk_sectors
||
7672 mddev
->delta_disks
> 0)
7673 if (resize_chunks(conf
,
7674 conf
->previous_raid_disks
7675 + max(0, mddev
->delta_disks
),
7676 max(mddev
->new_chunk_sectors
,
7677 mddev
->chunk_sectors
)
7680 return resize_stripes(conf
, (conf
->previous_raid_disks
7681 + mddev
->delta_disks
));
7684 static int raid5_start_reshape(struct mddev
*mddev
)
7686 struct r5conf
*conf
= mddev
->private;
7687 struct md_rdev
*rdev
;
7689 unsigned long flags
;
7691 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
7694 if (!check_stripe_cache(mddev
))
7697 if (has_failed(conf
))
7700 rdev_for_each(rdev
, mddev
) {
7701 if (!test_bit(In_sync
, &rdev
->flags
)
7702 && !test_bit(Faulty
, &rdev
->flags
))
7706 if (spares
- mddev
->degraded
< mddev
->delta_disks
- conf
->max_degraded
)
7707 /* Not enough devices even to make a degraded array
7712 /* Refuse to reduce size of the array. Any reductions in
7713 * array size must be through explicit setting of array_size
7716 if (raid5_size(mddev
, 0, conf
->raid_disks
+ mddev
->delta_disks
)
7717 < mddev
->array_sectors
) {
7718 pr_warn("md/raid:%s: array size must be reduced before number of disks\n",
7723 atomic_set(&conf
->reshape_stripes
, 0);
7724 spin_lock_irq(&conf
->device_lock
);
7725 write_seqcount_begin(&conf
->gen_lock
);
7726 conf
->previous_raid_disks
= conf
->raid_disks
;
7727 conf
->raid_disks
+= mddev
->delta_disks
;
7728 conf
->prev_chunk_sectors
= conf
->chunk_sectors
;
7729 conf
->chunk_sectors
= mddev
->new_chunk_sectors
;
7730 conf
->prev_algo
= conf
->algorithm
;
7731 conf
->algorithm
= mddev
->new_layout
;
7733 /* Code that selects data_offset needs to see the generation update
7734 * if reshape_progress has been set - so a memory barrier needed.
7737 if (mddev
->reshape_backwards
)
7738 conf
->reshape_progress
= raid5_size(mddev
, 0, 0);
7740 conf
->reshape_progress
= 0;
7741 conf
->reshape_safe
= conf
->reshape_progress
;
7742 write_seqcount_end(&conf
->gen_lock
);
7743 spin_unlock_irq(&conf
->device_lock
);
7745 /* Now make sure any requests that proceeded on the assumption
7746 * the reshape wasn't running - like Discard or Read - have
7749 mddev_suspend(mddev
);
7750 mddev_resume(mddev
);
7752 /* Add some new drives, as many as will fit.
7753 * We know there are enough to make the newly sized array work.
7754 * Don't add devices if we are reducing the number of
7755 * devices in the array. This is because it is not possible
7756 * to correctly record the "partially reconstructed" state of
7757 * such devices during the reshape and confusion could result.
7759 if (mddev
->delta_disks
>= 0) {
7760 rdev_for_each(rdev
, mddev
)
7761 if (rdev
->raid_disk
< 0 &&
7762 !test_bit(Faulty
, &rdev
->flags
)) {
7763 if (raid5_add_disk(mddev
, rdev
) == 0) {
7765 >= conf
->previous_raid_disks
)
7766 set_bit(In_sync
, &rdev
->flags
);
7768 rdev
->recovery_offset
= 0;
7770 if (sysfs_link_rdev(mddev
, rdev
))
7771 /* Failure here is OK */;
7773 } else if (rdev
->raid_disk
>= conf
->previous_raid_disks
7774 && !test_bit(Faulty
, &rdev
->flags
)) {
7775 /* This is a spare that was manually added */
7776 set_bit(In_sync
, &rdev
->flags
);
7779 /* When a reshape changes the number of devices,
7780 * ->degraded is measured against the larger of the
7781 * pre and post number of devices.
7783 spin_lock_irqsave(&conf
->device_lock
, flags
);
7784 mddev
->degraded
= raid5_calc_degraded(conf
);
7785 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
7787 mddev
->raid_disks
= conf
->raid_disks
;
7788 mddev
->reshape_position
= conf
->reshape_progress
;
7789 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
7791 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7792 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7793 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7794 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7795 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7796 mddev
->sync_thread
= md_register_thread(md_do_sync
, mddev
,
7798 if (!mddev
->sync_thread
) {
7799 mddev
->recovery
= 0;
7800 spin_lock_irq(&conf
->device_lock
);
7801 write_seqcount_begin(&conf
->gen_lock
);
7802 mddev
->raid_disks
= conf
->raid_disks
= conf
->previous_raid_disks
;
7803 mddev
->new_chunk_sectors
=
7804 conf
->chunk_sectors
= conf
->prev_chunk_sectors
;
7805 mddev
->new_layout
= conf
->algorithm
= conf
->prev_algo
;
7806 rdev_for_each(rdev
, mddev
)
7807 rdev
->new_data_offset
= rdev
->data_offset
;
7809 conf
->generation
--;
7810 conf
->reshape_progress
= MaxSector
;
7811 mddev
->reshape_position
= MaxSector
;
7812 write_seqcount_end(&conf
->gen_lock
);
7813 spin_unlock_irq(&conf
->device_lock
);
7816 conf
->reshape_checkpoint
= jiffies
;
7817 md_wakeup_thread(mddev
->sync_thread
);
7818 md_new_event(mddev
);
7822 /* This is called from the reshape thread and should make any
7823 * changes needed in 'conf'
7825 static void end_reshape(struct r5conf
*conf
)
7828 if (!test_bit(MD_RECOVERY_INTR
, &conf
->mddev
->recovery
)) {
7829 struct md_rdev
*rdev
;
7831 spin_lock_irq(&conf
->device_lock
);
7832 conf
->previous_raid_disks
= conf
->raid_disks
;
7833 rdev_for_each(rdev
, conf
->mddev
)
7834 rdev
->data_offset
= rdev
->new_data_offset
;
7836 conf
->reshape_progress
= MaxSector
;
7837 conf
->mddev
->reshape_position
= MaxSector
;
7838 spin_unlock_irq(&conf
->device_lock
);
7839 wake_up(&conf
->wait_for_overlap
);
7841 /* read-ahead size must cover two whole stripes, which is
7842 * 2 * (datadisks) * chunksize where 'n' is the number of raid devices
7844 if (conf
->mddev
->queue
) {
7845 int data_disks
= conf
->raid_disks
- conf
->max_degraded
;
7846 int stripe
= data_disks
* ((conf
->chunk_sectors
<< 9)
7848 if (conf
->mddev
->queue
->backing_dev_info
->ra_pages
< 2 * stripe
)
7849 conf
->mddev
->queue
->backing_dev_info
->ra_pages
= 2 * stripe
;
7854 /* This is called from the raid5d thread with mddev_lock held.
7855 * It makes config changes to the device.
7857 static void raid5_finish_reshape(struct mddev
*mddev
)
7859 struct r5conf
*conf
= mddev
->private;
7861 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7863 if (mddev
->delta_disks
> 0) {
7864 md_set_array_sectors(mddev
, raid5_size(mddev
, 0, 0));
7866 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
7867 revalidate_disk(mddev
->gendisk
);
7871 spin_lock_irq(&conf
->device_lock
);
7872 mddev
->degraded
= raid5_calc_degraded(conf
);
7873 spin_unlock_irq(&conf
->device_lock
);
7874 for (d
= conf
->raid_disks
;
7875 d
< conf
->raid_disks
- mddev
->delta_disks
;
7877 struct md_rdev
*rdev
= conf
->disks
[d
].rdev
;
7879 clear_bit(In_sync
, &rdev
->flags
);
7880 rdev
= conf
->disks
[d
].replacement
;
7882 clear_bit(In_sync
, &rdev
->flags
);
7885 mddev
->layout
= conf
->algorithm
;
7886 mddev
->chunk_sectors
= conf
->chunk_sectors
;
7887 mddev
->reshape_position
= MaxSector
;
7888 mddev
->delta_disks
= 0;
7889 mddev
->reshape_backwards
= 0;
7893 static void raid5_quiesce(struct mddev
*mddev
, int state
)
7895 struct r5conf
*conf
= mddev
->private;
7898 case 2: /* resume for a suspend */
7899 wake_up(&conf
->wait_for_overlap
);
7902 case 1: /* stop all writes */
7903 lock_all_device_hash_locks_irq(conf
);
7904 /* '2' tells resync/reshape to pause so that all
7905 * active stripes can drain
7907 r5c_flush_cache(conf
, INT_MAX
);
7909 wait_event_cmd(conf
->wait_for_quiescent
,
7910 atomic_read(&conf
->active_stripes
) == 0 &&
7911 atomic_read(&conf
->active_aligned_reads
) == 0,
7912 unlock_all_device_hash_locks_irq(conf
),
7913 lock_all_device_hash_locks_irq(conf
));
7915 unlock_all_device_hash_locks_irq(conf
);
7916 /* allow reshape to continue */
7917 wake_up(&conf
->wait_for_overlap
);
7920 case 0: /* re-enable writes */
7921 lock_all_device_hash_locks_irq(conf
);
7923 wake_up(&conf
->wait_for_quiescent
);
7924 wake_up(&conf
->wait_for_overlap
);
7925 unlock_all_device_hash_locks_irq(conf
);
7928 r5l_quiesce(conf
->log
, state
);
7931 static void *raid45_takeover_raid0(struct mddev
*mddev
, int level
)
7933 struct r0conf
*raid0_conf
= mddev
->private;
7936 /* for raid0 takeover only one zone is supported */
7937 if (raid0_conf
->nr_strip_zones
> 1) {
7938 pr_warn("md/raid:%s: cannot takeover raid0 with more than one zone.\n",
7940 return ERR_PTR(-EINVAL
);
7943 sectors
= raid0_conf
->strip_zone
[0].zone_end
;
7944 sector_div(sectors
, raid0_conf
->strip_zone
[0].nb_dev
);
7945 mddev
->dev_sectors
= sectors
;
7946 mddev
->new_level
= level
;
7947 mddev
->new_layout
= ALGORITHM_PARITY_N
;
7948 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
7949 mddev
->raid_disks
+= 1;
7950 mddev
->delta_disks
= 1;
7951 /* make sure it will be not marked as dirty */
7952 mddev
->recovery_cp
= MaxSector
;
7954 return setup_conf(mddev
);
7957 static void *raid5_takeover_raid1(struct mddev
*mddev
)
7962 if (mddev
->raid_disks
!= 2 ||
7963 mddev
->degraded
> 1)
7964 return ERR_PTR(-EINVAL
);
7966 /* Should check if there are write-behind devices? */
7968 chunksect
= 64*2; /* 64K by default */
7970 /* The array must be an exact multiple of chunksize */
7971 while (chunksect
&& (mddev
->array_sectors
& (chunksect
-1)))
7974 if ((chunksect
<<9) < STRIPE_SIZE
)
7975 /* array size does not allow a suitable chunk size */
7976 return ERR_PTR(-EINVAL
);
7978 mddev
->new_level
= 5;
7979 mddev
->new_layout
= ALGORITHM_LEFT_SYMMETRIC
;
7980 mddev
->new_chunk_sectors
= chunksect
;
7982 ret
= setup_conf(mddev
);
7984 mddev_clear_unsupported_flags(mddev
,
7985 UNSUPPORTED_MDDEV_FLAGS
);
7989 static void *raid5_takeover_raid6(struct mddev
*mddev
)
7993 switch (mddev
->layout
) {
7994 case ALGORITHM_LEFT_ASYMMETRIC_6
:
7995 new_layout
= ALGORITHM_LEFT_ASYMMETRIC
;
7997 case ALGORITHM_RIGHT_ASYMMETRIC_6
:
7998 new_layout
= ALGORITHM_RIGHT_ASYMMETRIC
;
8000 case ALGORITHM_LEFT_SYMMETRIC_6
:
8001 new_layout
= ALGORITHM_LEFT_SYMMETRIC
;
8003 case ALGORITHM_RIGHT_SYMMETRIC_6
:
8004 new_layout
= ALGORITHM_RIGHT_SYMMETRIC
;
8006 case ALGORITHM_PARITY_0_6
:
8007 new_layout
= ALGORITHM_PARITY_0
;
8009 case ALGORITHM_PARITY_N
:
8010 new_layout
= ALGORITHM_PARITY_N
;
8013 return ERR_PTR(-EINVAL
);
8015 mddev
->new_level
= 5;
8016 mddev
->new_layout
= new_layout
;
8017 mddev
->delta_disks
= -1;
8018 mddev
->raid_disks
-= 1;
8019 return setup_conf(mddev
);
8022 static int raid5_check_reshape(struct mddev
*mddev
)
8024 /* For a 2-drive array, the layout and chunk size can be changed
8025 * immediately as not restriping is needed.
8026 * For larger arrays we record the new value - after validation
8027 * to be used by a reshape pass.
8029 struct r5conf
*conf
= mddev
->private;
8030 int new_chunk
= mddev
->new_chunk_sectors
;
8032 if (mddev
->new_layout
>= 0 && !algorithm_valid_raid5(mddev
->new_layout
))
8034 if (new_chunk
> 0) {
8035 if (!is_power_of_2(new_chunk
))
8037 if (new_chunk
< (PAGE_SIZE
>>9))
8039 if (mddev
->array_sectors
& (new_chunk
-1))
8040 /* not factor of array size */
8044 /* They look valid */
8046 if (mddev
->raid_disks
== 2) {
8047 /* can make the change immediately */
8048 if (mddev
->new_layout
>= 0) {
8049 conf
->algorithm
= mddev
->new_layout
;
8050 mddev
->layout
= mddev
->new_layout
;
8052 if (new_chunk
> 0) {
8053 conf
->chunk_sectors
= new_chunk
;
8054 mddev
->chunk_sectors
= new_chunk
;
8056 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8057 md_wakeup_thread(mddev
->thread
);
8059 return check_reshape(mddev
);
8062 static int raid6_check_reshape(struct mddev
*mddev
)
8064 int new_chunk
= mddev
->new_chunk_sectors
;
8066 if (mddev
->new_layout
>= 0 && !algorithm_valid_raid6(mddev
->new_layout
))
8068 if (new_chunk
> 0) {
8069 if (!is_power_of_2(new_chunk
))
8071 if (new_chunk
< (PAGE_SIZE
>> 9))
8073 if (mddev
->array_sectors
& (new_chunk
-1))
8074 /* not factor of array size */
8078 /* They look valid */
8079 return check_reshape(mddev
);
8082 static void *raid5_takeover(struct mddev
*mddev
)
8084 /* raid5 can take over:
8085 * raid0 - if there is only one strip zone - make it a raid4 layout
8086 * raid1 - if there are two drives. We need to know the chunk size
8087 * raid4 - trivial - just use a raid4 layout.
8088 * raid6 - Providing it is a *_6 layout
8090 if (mddev
->level
== 0)
8091 return raid45_takeover_raid0(mddev
, 5);
8092 if (mddev
->level
== 1)
8093 return raid5_takeover_raid1(mddev
);
8094 if (mddev
->level
== 4) {
8095 mddev
->new_layout
= ALGORITHM_PARITY_N
;
8096 mddev
->new_level
= 5;
8097 return setup_conf(mddev
);
8099 if (mddev
->level
== 6)
8100 return raid5_takeover_raid6(mddev
);
8102 return ERR_PTR(-EINVAL
);
8105 static void *raid4_takeover(struct mddev
*mddev
)
8107 /* raid4 can take over:
8108 * raid0 - if there is only one strip zone
8109 * raid5 - if layout is right
8111 if (mddev
->level
== 0)
8112 return raid45_takeover_raid0(mddev
, 4);
8113 if (mddev
->level
== 5 &&
8114 mddev
->layout
== ALGORITHM_PARITY_N
) {
8115 mddev
->new_layout
= 0;
8116 mddev
->new_level
= 4;
8117 return setup_conf(mddev
);
8119 return ERR_PTR(-EINVAL
);
8122 static struct md_personality raid5_personality
;
8124 static void *raid6_takeover(struct mddev
*mddev
)
8126 /* Currently can only take over a raid5. We map the
8127 * personality to an equivalent raid6 personality
8128 * with the Q block at the end.
8132 if (mddev
->pers
!= &raid5_personality
)
8133 return ERR_PTR(-EINVAL
);
8134 if (mddev
->degraded
> 1)
8135 return ERR_PTR(-EINVAL
);
8136 if (mddev
->raid_disks
> 253)
8137 return ERR_PTR(-EINVAL
);
8138 if (mddev
->raid_disks
< 3)
8139 return ERR_PTR(-EINVAL
);
8141 switch (mddev
->layout
) {
8142 case ALGORITHM_LEFT_ASYMMETRIC
:
8143 new_layout
= ALGORITHM_LEFT_ASYMMETRIC_6
;
8145 case ALGORITHM_RIGHT_ASYMMETRIC
:
8146 new_layout
= ALGORITHM_RIGHT_ASYMMETRIC_6
;
8148 case ALGORITHM_LEFT_SYMMETRIC
:
8149 new_layout
= ALGORITHM_LEFT_SYMMETRIC_6
;
8151 case ALGORITHM_RIGHT_SYMMETRIC
:
8152 new_layout
= ALGORITHM_RIGHT_SYMMETRIC_6
;
8154 case ALGORITHM_PARITY_0
:
8155 new_layout
= ALGORITHM_PARITY_0_6
;
8157 case ALGORITHM_PARITY_N
:
8158 new_layout
= ALGORITHM_PARITY_N
;
8161 return ERR_PTR(-EINVAL
);
8163 mddev
->new_level
= 6;
8164 mddev
->new_layout
= new_layout
;
8165 mddev
->delta_disks
= 1;
8166 mddev
->raid_disks
+= 1;
8167 return setup_conf(mddev
);
8170 static struct md_personality raid6_personality
=
8174 .owner
= THIS_MODULE
,
8175 .make_request
= raid5_make_request
,
8178 .status
= raid5_status
,
8179 .error_handler
= raid5_error
,
8180 .hot_add_disk
= raid5_add_disk
,
8181 .hot_remove_disk
= raid5_remove_disk
,
8182 .spare_active
= raid5_spare_active
,
8183 .sync_request
= raid5_sync_request
,
8184 .resize
= raid5_resize
,
8186 .check_reshape
= raid6_check_reshape
,
8187 .start_reshape
= raid5_start_reshape
,
8188 .finish_reshape
= raid5_finish_reshape
,
8189 .quiesce
= raid5_quiesce
,
8190 .takeover
= raid6_takeover
,
8191 .congested
= raid5_congested
,
8193 static struct md_personality raid5_personality
=
8197 .owner
= THIS_MODULE
,
8198 .make_request
= raid5_make_request
,
8201 .status
= raid5_status
,
8202 .error_handler
= raid5_error
,
8203 .hot_add_disk
= raid5_add_disk
,
8204 .hot_remove_disk
= raid5_remove_disk
,
8205 .spare_active
= raid5_spare_active
,
8206 .sync_request
= raid5_sync_request
,
8207 .resize
= raid5_resize
,
8209 .check_reshape
= raid5_check_reshape
,
8210 .start_reshape
= raid5_start_reshape
,
8211 .finish_reshape
= raid5_finish_reshape
,
8212 .quiesce
= raid5_quiesce
,
8213 .takeover
= raid5_takeover
,
8214 .congested
= raid5_congested
,
8217 static struct md_personality raid4_personality
=
8221 .owner
= THIS_MODULE
,
8222 .make_request
= raid5_make_request
,
8225 .status
= raid5_status
,
8226 .error_handler
= raid5_error
,
8227 .hot_add_disk
= raid5_add_disk
,
8228 .hot_remove_disk
= raid5_remove_disk
,
8229 .spare_active
= raid5_spare_active
,
8230 .sync_request
= raid5_sync_request
,
8231 .resize
= raid5_resize
,
8233 .check_reshape
= raid5_check_reshape
,
8234 .start_reshape
= raid5_start_reshape
,
8235 .finish_reshape
= raid5_finish_reshape
,
8236 .quiesce
= raid5_quiesce
,
8237 .takeover
= raid4_takeover
,
8238 .congested
= raid5_congested
,
8241 static int __init
raid5_init(void)
8245 raid5_wq
= alloc_workqueue("raid5wq",
8246 WQ_UNBOUND
|WQ_MEM_RECLAIM
|WQ_CPU_INTENSIVE
|WQ_SYSFS
, 0);
8250 ret
= cpuhp_setup_state_multi(CPUHP_MD_RAID5_PREPARE
,
8252 raid456_cpu_up_prepare
,
8255 destroy_workqueue(raid5_wq
);
8258 register_md_personality(&raid6_personality
);
8259 register_md_personality(&raid5_personality
);
8260 register_md_personality(&raid4_personality
);
8264 static void raid5_exit(void)
8266 unregister_md_personality(&raid6_personality
);
8267 unregister_md_personality(&raid5_personality
);
8268 unregister_md_personality(&raid4_personality
);
8269 cpuhp_remove_multi_state(CPUHP_MD_RAID5_PREPARE
);
8270 destroy_workqueue(raid5_wq
);
8273 module_init(raid5_init
);
8274 module_exit(raid5_exit
);
8275 MODULE_LICENSE("GPL");
8276 MODULE_DESCRIPTION("RAID4/5/6 (striping with parity) personality for MD");
8277 MODULE_ALIAS("md-personality-4"); /* RAID5 */
8278 MODULE_ALIAS("md-raid5");
8279 MODULE_ALIAS("md-raid4");
8280 MODULE_ALIAS("md-level-5");
8281 MODULE_ALIAS("md-level-4");
8282 MODULE_ALIAS("md-personality-8"); /* RAID6 */
8283 MODULE_ALIAS("md-raid6");
8284 MODULE_ALIAS("md-level-6");
8286 /* This used to be two separate modules, they were: */
8287 MODULE_ALIAS("raid5");
8288 MODULE_ALIAS("raid6");