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 <trace/events/block.h>
65 #define UNSUPPORTED_MDDEV_FLAGS (1L << MD_FAILFAST_SUPPORTED)
67 #define cpu_to_group(cpu) cpu_to_node(cpu)
68 #define ANY_GROUP NUMA_NO_NODE
70 static bool devices_handle_discard_safely
= false;
71 module_param(devices_handle_discard_safely
, bool, 0644);
72 MODULE_PARM_DESC(devices_handle_discard_safely
,
73 "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions");
74 static struct workqueue_struct
*raid5_wq
;
76 static inline struct hlist_head
*stripe_hash(struct r5conf
*conf
, sector_t sect
)
78 int hash
= (sect
>> STRIPE_SHIFT
) & HASH_MASK
;
79 return &conf
->stripe_hashtbl
[hash
];
82 static inline int stripe_hash_locks_hash(sector_t sect
)
84 return (sect
>> STRIPE_SHIFT
) & STRIPE_HASH_LOCKS_MASK
;
87 static inline void lock_device_hash_lock(struct r5conf
*conf
, int hash
)
89 spin_lock_irq(conf
->hash_locks
+ hash
);
90 spin_lock(&conf
->device_lock
);
93 static inline void unlock_device_hash_lock(struct r5conf
*conf
, int hash
)
95 spin_unlock(&conf
->device_lock
);
96 spin_unlock_irq(conf
->hash_locks
+ hash
);
99 static inline void lock_all_device_hash_locks_irq(struct r5conf
*conf
)
103 spin_lock(conf
->hash_locks
);
104 for (i
= 1; i
< NR_STRIPE_HASH_LOCKS
; i
++)
105 spin_lock_nest_lock(conf
->hash_locks
+ i
, conf
->hash_locks
);
106 spin_lock(&conf
->device_lock
);
109 static inline void unlock_all_device_hash_locks_irq(struct r5conf
*conf
)
112 spin_unlock(&conf
->device_lock
);
113 for (i
= NR_STRIPE_HASH_LOCKS
; i
; i
--)
114 spin_unlock(conf
->hash_locks
+ i
- 1);
118 /* Find first data disk in a raid6 stripe */
119 static inline int raid6_d0(struct stripe_head
*sh
)
122 /* ddf always start from first device */
124 /* md starts just after Q block */
125 if (sh
->qd_idx
== sh
->disks
- 1)
128 return sh
->qd_idx
+ 1;
130 static inline int raid6_next_disk(int disk
, int raid_disks
)
133 return (disk
< raid_disks
) ? disk
: 0;
136 /* When walking through the disks in a raid5, starting at raid6_d0,
137 * We need to map each disk to a 'slot', where the data disks are slot
138 * 0 .. raid_disks-3, the parity disk is raid_disks-2 and the Q disk
139 * is raid_disks-1. This help does that mapping.
141 static int raid6_idx_to_slot(int idx
, struct stripe_head
*sh
,
142 int *count
, int syndrome_disks
)
148 if (idx
== sh
->pd_idx
)
149 return syndrome_disks
;
150 if (idx
== sh
->qd_idx
)
151 return syndrome_disks
+ 1;
157 static void return_io(struct bio_list
*return_bi
)
160 while ((bi
= bio_list_pop(return_bi
)) != NULL
) {
161 bi
->bi_iter
.bi_size
= 0;
162 trace_block_bio_complete(bdev_get_queue(bi
->bi_bdev
),
168 static void print_raid5_conf (struct r5conf
*conf
);
170 static int stripe_operations_active(struct stripe_head
*sh
)
172 return sh
->check_state
|| sh
->reconstruct_state
||
173 test_bit(STRIPE_BIOFILL_RUN
, &sh
->state
) ||
174 test_bit(STRIPE_COMPUTE_RUN
, &sh
->state
);
177 static void raid5_wakeup_stripe_thread(struct stripe_head
*sh
)
179 struct r5conf
*conf
= sh
->raid_conf
;
180 struct r5worker_group
*group
;
182 int i
, cpu
= sh
->cpu
;
184 if (!cpu_online(cpu
)) {
185 cpu
= cpumask_any(cpu_online_mask
);
189 if (list_empty(&sh
->lru
)) {
190 struct r5worker_group
*group
;
191 group
= conf
->worker_groups
+ cpu_to_group(cpu
);
192 list_add_tail(&sh
->lru
, &group
->handle_list
);
193 group
->stripes_cnt
++;
197 if (conf
->worker_cnt_per_group
== 0) {
198 md_wakeup_thread(conf
->mddev
->thread
);
202 group
= conf
->worker_groups
+ cpu_to_group(sh
->cpu
);
204 group
->workers
[0].working
= true;
205 /* at least one worker should run to avoid race */
206 queue_work_on(sh
->cpu
, raid5_wq
, &group
->workers
[0].work
);
208 thread_cnt
= group
->stripes_cnt
/ MAX_STRIPE_BATCH
- 1;
209 /* wakeup more workers */
210 for (i
= 1; i
< conf
->worker_cnt_per_group
&& thread_cnt
> 0; i
++) {
211 if (group
->workers
[i
].working
== false) {
212 group
->workers
[i
].working
= true;
213 queue_work_on(sh
->cpu
, raid5_wq
,
214 &group
->workers
[i
].work
);
220 static void do_release_stripe(struct r5conf
*conf
, struct stripe_head
*sh
,
221 struct list_head
*temp_inactive_list
)
224 int injournal
= 0; /* number of date pages with R5_InJournal */
226 BUG_ON(!list_empty(&sh
->lru
));
227 BUG_ON(atomic_read(&conf
->active_stripes
)==0);
229 if (r5c_is_writeback(conf
->log
))
230 for (i
= sh
->disks
; i
--; )
231 if (test_bit(R5_InJournal
, &sh
->dev
[i
].flags
))
234 * When quiesce in r5c write back, set STRIPE_HANDLE for stripes with
235 * data in journal, so they are not released to cached lists
237 if (conf
->quiesce
&& r5c_is_writeback(conf
->log
) &&
238 !test_bit(STRIPE_HANDLE
, &sh
->state
) && injournal
!= 0) {
239 if (test_bit(STRIPE_R5C_CACHING
, &sh
->state
))
240 r5c_make_stripe_write_out(sh
);
241 set_bit(STRIPE_HANDLE
, &sh
->state
);
244 if (test_bit(STRIPE_HANDLE
, &sh
->state
)) {
245 if (test_bit(STRIPE_DELAYED
, &sh
->state
) &&
246 !test_bit(STRIPE_PREREAD_ACTIVE
, &sh
->state
))
247 list_add_tail(&sh
->lru
, &conf
->delayed_list
);
248 else if (test_bit(STRIPE_BIT_DELAY
, &sh
->state
) &&
249 sh
->bm_seq
- conf
->seq_write
> 0)
250 list_add_tail(&sh
->lru
, &conf
->bitmap_list
);
252 clear_bit(STRIPE_DELAYED
, &sh
->state
);
253 clear_bit(STRIPE_BIT_DELAY
, &sh
->state
);
254 if (conf
->worker_cnt_per_group
== 0) {
255 list_add_tail(&sh
->lru
, &conf
->handle_list
);
257 raid5_wakeup_stripe_thread(sh
);
261 md_wakeup_thread(conf
->mddev
->thread
);
263 BUG_ON(stripe_operations_active(sh
));
264 if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE
, &sh
->state
))
265 if (atomic_dec_return(&conf
->preread_active_stripes
)
267 md_wakeup_thread(conf
->mddev
->thread
);
268 atomic_dec(&conf
->active_stripes
);
269 if (!test_bit(STRIPE_EXPANDING
, &sh
->state
)) {
270 if (!r5c_is_writeback(conf
->log
))
271 list_add_tail(&sh
->lru
, temp_inactive_list
);
273 WARN_ON(test_bit(R5_InJournal
, &sh
->dev
[sh
->pd_idx
].flags
));
275 list_add_tail(&sh
->lru
, temp_inactive_list
);
276 else if (injournal
== conf
->raid_disks
- conf
->max_degraded
) {
278 if (!test_and_set_bit(STRIPE_R5C_FULL_STRIPE
, &sh
->state
))
279 atomic_inc(&conf
->r5c_cached_full_stripes
);
280 if (test_and_clear_bit(STRIPE_R5C_PARTIAL_STRIPE
, &sh
->state
))
281 atomic_dec(&conf
->r5c_cached_partial_stripes
);
282 list_add_tail(&sh
->lru
, &conf
->r5c_full_stripe_list
);
283 r5c_check_cached_full_stripe(conf
);
286 if (!test_and_set_bit(STRIPE_R5C_PARTIAL_STRIPE
,
288 atomic_inc(&conf
->r5c_cached_partial_stripes
);
289 list_add_tail(&sh
->lru
, &conf
->r5c_partial_stripe_list
);
296 static void __release_stripe(struct r5conf
*conf
, struct stripe_head
*sh
,
297 struct list_head
*temp_inactive_list
)
299 if (atomic_dec_and_test(&sh
->count
))
300 do_release_stripe(conf
, sh
, temp_inactive_list
);
304 * @hash could be NR_STRIPE_HASH_LOCKS, then we have a list of inactive_list
306 * Be careful: Only one task can add/delete stripes from temp_inactive_list at
307 * given time. Adding stripes only takes device lock, while deleting stripes
308 * only takes hash lock.
310 static void release_inactive_stripe_list(struct r5conf
*conf
,
311 struct list_head
*temp_inactive_list
,
315 bool do_wakeup
= false;
318 if (hash
== NR_STRIPE_HASH_LOCKS
) {
319 size
= NR_STRIPE_HASH_LOCKS
;
320 hash
= NR_STRIPE_HASH_LOCKS
- 1;
324 struct list_head
*list
= &temp_inactive_list
[size
- 1];
327 * We don't hold any lock here yet, raid5_get_active_stripe() might
328 * remove stripes from the list
330 if (!list_empty_careful(list
)) {
331 spin_lock_irqsave(conf
->hash_locks
+ hash
, flags
);
332 if (list_empty(conf
->inactive_list
+ hash
) &&
334 atomic_dec(&conf
->empty_inactive_list_nr
);
335 list_splice_tail_init(list
, conf
->inactive_list
+ hash
);
337 spin_unlock_irqrestore(conf
->hash_locks
+ hash
, flags
);
344 wake_up(&conf
->wait_for_stripe
);
345 if (atomic_read(&conf
->active_stripes
) == 0)
346 wake_up(&conf
->wait_for_quiescent
);
347 if (conf
->retry_read_aligned
)
348 md_wakeup_thread(conf
->mddev
->thread
);
352 /* should hold conf->device_lock already */
353 static int release_stripe_list(struct r5conf
*conf
,
354 struct list_head
*temp_inactive_list
)
356 struct stripe_head
*sh
;
358 struct llist_node
*head
;
360 head
= llist_del_all(&conf
->released_stripes
);
361 head
= llist_reverse_order(head
);
365 sh
= llist_entry(head
, struct stripe_head
, release_list
);
366 head
= llist_next(head
);
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.
867 raid5_end_read_request(struct bio
*bi
);
869 raid5_end_write_request(struct bio
*bi
);
871 static void ops_run_io(struct stripe_head
*sh
, struct stripe_head_state
*s
)
873 struct r5conf
*conf
= sh
->raid_conf
;
874 int i
, disks
= sh
->disks
;
875 struct stripe_head
*head_sh
= sh
;
879 if (!test_bit(STRIPE_R5C_CACHING
, &sh
->state
)) {
880 /* writing out phase */
881 if (s
->waiting_extra_page
)
883 if (r5l_write_stripe(conf
->log
, sh
) == 0)
885 } else { /* caching phase */
886 if (test_bit(STRIPE_LOG_TRAPPED
, &sh
->state
)) {
887 r5c_cache_data(conf
->log
, sh
, s
);
892 for (i
= disks
; i
--; ) {
893 int op
, op_flags
= 0;
894 int replace_only
= 0;
895 struct bio
*bi
, *rbi
;
896 struct md_rdev
*rdev
, *rrdev
= NULL
;
899 if (test_and_clear_bit(R5_Wantwrite
, &sh
->dev
[i
].flags
)) {
901 if (test_and_clear_bit(R5_WantFUA
, &sh
->dev
[i
].flags
))
903 if (test_bit(R5_Discard
, &sh
->dev
[i
].flags
))
905 } else if (test_and_clear_bit(R5_Wantread
, &sh
->dev
[i
].flags
))
907 else if (test_and_clear_bit(R5_WantReplace
,
908 &sh
->dev
[i
].flags
)) {
913 if (test_and_clear_bit(R5_SyncIO
, &sh
->dev
[i
].flags
))
914 op_flags
|= REQ_SYNC
;
917 bi
= &sh
->dev
[i
].req
;
918 rbi
= &sh
->dev
[i
].rreq
; /* For writing to replacement */
921 rrdev
= rcu_dereference(conf
->disks
[i
].replacement
);
922 smp_mb(); /* Ensure that if rrdev is NULL, rdev won't be */
923 rdev
= rcu_dereference(conf
->disks
[i
].rdev
);
928 if (op_is_write(op
)) {
932 /* We raced and saw duplicates */
935 if (test_bit(R5_ReadRepl
, &head_sh
->dev
[i
].flags
) && rrdev
)
940 if (rdev
&& test_bit(Faulty
, &rdev
->flags
))
943 atomic_inc(&rdev
->nr_pending
);
944 if (rrdev
&& test_bit(Faulty
, &rrdev
->flags
))
947 atomic_inc(&rrdev
->nr_pending
);
950 /* We have already checked bad blocks for reads. Now
951 * need to check for writes. We never accept write errors
952 * on the replacement, so we don't to check rrdev.
954 while (op_is_write(op
) && rdev
&&
955 test_bit(WriteErrorSeen
, &rdev
->flags
)) {
958 int bad
= is_badblock(rdev
, sh
->sector
, STRIPE_SECTORS
,
959 &first_bad
, &bad_sectors
);
964 set_bit(BlockedBadBlocks
, &rdev
->flags
);
965 if (!conf
->mddev
->external
&&
966 conf
->mddev
->sb_flags
) {
967 /* It is very unlikely, but we might
968 * still need to write out the
969 * bad block log - better give it
971 md_check_recovery(conf
->mddev
);
974 * Because md_wait_for_blocked_rdev
975 * will dec nr_pending, we must
976 * increment it first.
978 atomic_inc(&rdev
->nr_pending
);
979 md_wait_for_blocked_rdev(rdev
, conf
->mddev
);
981 /* Acknowledged bad block - skip the write */
982 rdev_dec_pending(rdev
, conf
->mddev
);
988 if (s
->syncing
|| s
->expanding
|| s
->expanded
990 md_sync_acct(rdev
->bdev
, STRIPE_SECTORS
);
992 set_bit(STRIPE_IO_STARTED
, &sh
->state
);
994 bi
->bi_bdev
= rdev
->bdev
;
995 bio_set_op_attrs(bi
, op
, op_flags
);
996 bi
->bi_end_io
= op_is_write(op
)
997 ? raid5_end_write_request
998 : raid5_end_read_request
;
1001 pr_debug("%s: for %llu schedule op %d on disc %d\n",
1002 __func__
, (unsigned long long)sh
->sector
,
1004 atomic_inc(&sh
->count
);
1006 atomic_inc(&head_sh
->count
);
1007 if (use_new_offset(conf
, sh
))
1008 bi
->bi_iter
.bi_sector
= (sh
->sector
1009 + rdev
->new_data_offset
);
1011 bi
->bi_iter
.bi_sector
= (sh
->sector
1012 + rdev
->data_offset
);
1013 if (test_bit(R5_ReadNoMerge
, &head_sh
->dev
[i
].flags
))
1014 bi
->bi_opf
|= REQ_NOMERGE
;
1016 if (test_bit(R5_SkipCopy
, &sh
->dev
[i
].flags
))
1017 WARN_ON(test_bit(R5_UPTODATE
, &sh
->dev
[i
].flags
));
1019 if (!op_is_write(op
) &&
1020 test_bit(R5_InJournal
, &sh
->dev
[i
].flags
))
1022 * issuing read for a page in journal, this
1023 * must be preparing for prexor in rmw; read
1024 * the data into orig_page
1026 sh
->dev
[i
].vec
.bv_page
= sh
->dev
[i
].orig_page
;
1028 sh
->dev
[i
].vec
.bv_page
= sh
->dev
[i
].page
;
1030 bi
->bi_io_vec
[0].bv_len
= STRIPE_SIZE
;
1031 bi
->bi_io_vec
[0].bv_offset
= 0;
1032 bi
->bi_iter
.bi_size
= STRIPE_SIZE
;
1034 * If this is discard request, set bi_vcnt 0. We don't
1035 * want to confuse SCSI because SCSI will replace payload
1037 if (op
== REQ_OP_DISCARD
)
1040 set_bit(R5_DOUBLE_LOCKED
, &sh
->dev
[i
].flags
);
1042 if (conf
->mddev
->gendisk
)
1043 trace_block_bio_remap(bdev_get_queue(bi
->bi_bdev
),
1044 bi
, disk_devt(conf
->mddev
->gendisk
),
1046 generic_make_request(bi
);
1049 if (s
->syncing
|| s
->expanding
|| s
->expanded
1051 md_sync_acct(rrdev
->bdev
, STRIPE_SECTORS
);
1053 set_bit(STRIPE_IO_STARTED
, &sh
->state
);
1055 rbi
->bi_bdev
= rrdev
->bdev
;
1056 bio_set_op_attrs(rbi
, op
, op_flags
);
1057 BUG_ON(!op_is_write(op
));
1058 rbi
->bi_end_io
= raid5_end_write_request
;
1059 rbi
->bi_private
= sh
;
1061 pr_debug("%s: for %llu schedule op %d on "
1062 "replacement disc %d\n",
1063 __func__
, (unsigned long long)sh
->sector
,
1065 atomic_inc(&sh
->count
);
1067 atomic_inc(&head_sh
->count
);
1068 if (use_new_offset(conf
, sh
))
1069 rbi
->bi_iter
.bi_sector
= (sh
->sector
1070 + rrdev
->new_data_offset
);
1072 rbi
->bi_iter
.bi_sector
= (sh
->sector
1073 + rrdev
->data_offset
);
1074 if (test_bit(R5_SkipCopy
, &sh
->dev
[i
].flags
))
1075 WARN_ON(test_bit(R5_UPTODATE
, &sh
->dev
[i
].flags
));
1076 sh
->dev
[i
].rvec
.bv_page
= sh
->dev
[i
].page
;
1078 rbi
->bi_io_vec
[0].bv_len
= STRIPE_SIZE
;
1079 rbi
->bi_io_vec
[0].bv_offset
= 0;
1080 rbi
->bi_iter
.bi_size
= STRIPE_SIZE
;
1082 * If this is discard request, set bi_vcnt 0. We don't
1083 * want to confuse SCSI because SCSI will replace payload
1085 if (op
== REQ_OP_DISCARD
)
1087 if (conf
->mddev
->gendisk
)
1088 trace_block_bio_remap(bdev_get_queue(rbi
->bi_bdev
),
1089 rbi
, disk_devt(conf
->mddev
->gendisk
),
1091 generic_make_request(rbi
);
1093 if (!rdev
&& !rrdev
) {
1094 if (op_is_write(op
))
1095 set_bit(STRIPE_DEGRADED
, &sh
->state
);
1096 pr_debug("skip op %d on disc %d for sector %llu\n",
1097 bi
->bi_opf
, i
, (unsigned long long)sh
->sector
);
1098 clear_bit(R5_LOCKED
, &sh
->dev
[i
].flags
);
1099 set_bit(STRIPE_HANDLE
, &sh
->state
);
1102 if (!head_sh
->batch_head
)
1104 sh
= list_first_entry(&sh
->batch_list
, struct stripe_head
,
1111 static struct dma_async_tx_descriptor
*
1112 async_copy_data(int frombio
, struct bio
*bio
, struct page
**page
,
1113 sector_t sector
, struct dma_async_tx_descriptor
*tx
,
1114 struct stripe_head
*sh
, int no_skipcopy
)
1117 struct bvec_iter iter
;
1118 struct page
*bio_page
;
1120 struct async_submit_ctl submit
;
1121 enum async_tx_flags flags
= 0;
1123 if (bio
->bi_iter
.bi_sector
>= sector
)
1124 page_offset
= (signed)(bio
->bi_iter
.bi_sector
- sector
) * 512;
1126 page_offset
= (signed)(sector
- bio
->bi_iter
.bi_sector
) * -512;
1129 flags
|= ASYNC_TX_FENCE
;
1130 init_async_submit(&submit
, flags
, tx
, NULL
, NULL
, NULL
);
1132 bio_for_each_segment(bvl
, bio
, iter
) {
1133 int len
= bvl
.bv_len
;
1137 if (page_offset
< 0) {
1138 b_offset
= -page_offset
;
1139 page_offset
+= b_offset
;
1143 if (len
> 0 && page_offset
+ len
> STRIPE_SIZE
)
1144 clen
= STRIPE_SIZE
- page_offset
;
1149 b_offset
+= bvl
.bv_offset
;
1150 bio_page
= bvl
.bv_page
;
1152 if (sh
->raid_conf
->skip_copy
&&
1153 b_offset
== 0 && page_offset
== 0 &&
1154 clen
== STRIPE_SIZE
&&
1158 tx
= async_memcpy(*page
, bio_page
, page_offset
,
1159 b_offset
, clen
, &submit
);
1161 tx
= async_memcpy(bio_page
, *page
, b_offset
,
1162 page_offset
, clen
, &submit
);
1164 /* chain the operations */
1165 submit
.depend_tx
= tx
;
1167 if (clen
< len
) /* hit end of page */
1175 static void ops_complete_biofill(void *stripe_head_ref
)
1177 struct stripe_head
*sh
= stripe_head_ref
;
1178 struct bio_list return_bi
= BIO_EMPTY_LIST
;
1181 pr_debug("%s: stripe %llu\n", __func__
,
1182 (unsigned long long)sh
->sector
);
1184 /* clear completed biofills */
1185 for (i
= sh
->disks
; i
--; ) {
1186 struct r5dev
*dev
= &sh
->dev
[i
];
1188 /* acknowledge completion of a biofill operation */
1189 /* and check if we need to reply to a read request,
1190 * new R5_Wantfill requests are held off until
1191 * !STRIPE_BIOFILL_RUN
1193 if (test_and_clear_bit(R5_Wantfill
, &dev
->flags
)) {
1194 struct bio
*rbi
, *rbi2
;
1199 while (rbi
&& rbi
->bi_iter
.bi_sector
<
1200 dev
->sector
+ STRIPE_SECTORS
) {
1201 rbi2
= r5_next_bio(rbi
, dev
->sector
);
1202 if (!raid5_dec_bi_active_stripes(rbi
))
1203 bio_list_add(&return_bi
, rbi
);
1208 clear_bit(STRIPE_BIOFILL_RUN
, &sh
->state
);
1210 return_io(&return_bi
);
1212 set_bit(STRIPE_HANDLE
, &sh
->state
);
1213 raid5_release_stripe(sh
);
1216 static void ops_run_biofill(struct stripe_head
*sh
)
1218 struct dma_async_tx_descriptor
*tx
= NULL
;
1219 struct async_submit_ctl submit
;
1222 BUG_ON(sh
->batch_head
);
1223 pr_debug("%s: stripe %llu\n", __func__
,
1224 (unsigned long long)sh
->sector
);
1226 for (i
= sh
->disks
; i
--; ) {
1227 struct r5dev
*dev
= &sh
->dev
[i
];
1228 if (test_bit(R5_Wantfill
, &dev
->flags
)) {
1230 spin_lock_irq(&sh
->stripe_lock
);
1231 dev
->read
= rbi
= dev
->toread
;
1233 spin_unlock_irq(&sh
->stripe_lock
);
1234 while (rbi
&& rbi
->bi_iter
.bi_sector
<
1235 dev
->sector
+ STRIPE_SECTORS
) {
1236 tx
= async_copy_data(0, rbi
, &dev
->page
,
1237 dev
->sector
, tx
, sh
, 0);
1238 rbi
= r5_next_bio(rbi
, dev
->sector
);
1243 atomic_inc(&sh
->count
);
1244 init_async_submit(&submit
, ASYNC_TX_ACK
, tx
, ops_complete_biofill
, sh
, NULL
);
1245 async_trigger_callback(&submit
);
1248 static void mark_target_uptodate(struct stripe_head
*sh
, int target
)
1255 tgt
= &sh
->dev
[target
];
1256 set_bit(R5_UPTODATE
, &tgt
->flags
);
1257 BUG_ON(!test_bit(R5_Wantcompute
, &tgt
->flags
));
1258 clear_bit(R5_Wantcompute
, &tgt
->flags
);
1261 static void ops_complete_compute(void *stripe_head_ref
)
1263 struct stripe_head
*sh
= stripe_head_ref
;
1265 pr_debug("%s: stripe %llu\n", __func__
,
1266 (unsigned long long)sh
->sector
);
1268 /* mark the computed target(s) as uptodate */
1269 mark_target_uptodate(sh
, sh
->ops
.target
);
1270 mark_target_uptodate(sh
, sh
->ops
.target2
);
1272 clear_bit(STRIPE_COMPUTE_RUN
, &sh
->state
);
1273 if (sh
->check_state
== check_state_compute_run
)
1274 sh
->check_state
= check_state_compute_result
;
1275 set_bit(STRIPE_HANDLE
, &sh
->state
);
1276 raid5_release_stripe(sh
);
1279 /* return a pointer to the address conversion region of the scribble buffer */
1280 static addr_conv_t
*to_addr_conv(struct stripe_head
*sh
,
1281 struct raid5_percpu
*percpu
, int i
)
1285 addr
= flex_array_get(percpu
->scribble
, i
);
1286 return addr
+ sizeof(struct page
*) * (sh
->disks
+ 2);
1289 /* return a pointer to the address conversion region of the scribble buffer */
1290 static struct page
**to_addr_page(struct raid5_percpu
*percpu
, int i
)
1294 addr
= flex_array_get(percpu
->scribble
, i
);
1298 static struct dma_async_tx_descriptor
*
1299 ops_run_compute5(struct stripe_head
*sh
, struct raid5_percpu
*percpu
)
1301 int disks
= sh
->disks
;
1302 struct page
**xor_srcs
= to_addr_page(percpu
, 0);
1303 int target
= sh
->ops
.target
;
1304 struct r5dev
*tgt
= &sh
->dev
[target
];
1305 struct page
*xor_dest
= tgt
->page
;
1307 struct dma_async_tx_descriptor
*tx
;
1308 struct async_submit_ctl submit
;
1311 BUG_ON(sh
->batch_head
);
1313 pr_debug("%s: stripe %llu block: %d\n",
1314 __func__
, (unsigned long long)sh
->sector
, target
);
1315 BUG_ON(!test_bit(R5_Wantcompute
, &tgt
->flags
));
1317 for (i
= disks
; i
--; )
1319 xor_srcs
[count
++] = sh
->dev
[i
].page
;
1321 atomic_inc(&sh
->count
);
1323 init_async_submit(&submit
, ASYNC_TX_FENCE
|ASYNC_TX_XOR_ZERO_DST
, NULL
,
1324 ops_complete_compute
, sh
, to_addr_conv(sh
, percpu
, 0));
1325 if (unlikely(count
== 1))
1326 tx
= async_memcpy(xor_dest
, xor_srcs
[0], 0, 0, STRIPE_SIZE
, &submit
);
1328 tx
= async_xor(xor_dest
, xor_srcs
, 0, count
, STRIPE_SIZE
, &submit
);
1333 /* set_syndrome_sources - populate source buffers for gen_syndrome
1334 * @srcs - (struct page *) array of size sh->disks
1335 * @sh - stripe_head to parse
1337 * Populates srcs in proper layout order for the stripe and returns the
1338 * 'count' of sources to be used in a call to async_gen_syndrome. The P
1339 * destination buffer is recorded in srcs[count] and the Q destination
1340 * is recorded in srcs[count+1]].
1342 static int set_syndrome_sources(struct page
**srcs
,
1343 struct stripe_head
*sh
,
1346 int disks
= sh
->disks
;
1347 int syndrome_disks
= sh
->ddf_layout
? disks
: (disks
- 2);
1348 int d0_idx
= raid6_d0(sh
);
1352 for (i
= 0; i
< disks
; i
++)
1358 int slot
= raid6_idx_to_slot(i
, sh
, &count
, syndrome_disks
);
1359 struct r5dev
*dev
= &sh
->dev
[i
];
1361 if (i
== sh
->qd_idx
|| i
== sh
->pd_idx
||
1362 (srctype
== SYNDROME_SRC_ALL
) ||
1363 (srctype
== SYNDROME_SRC_WANT_DRAIN
&&
1364 (test_bit(R5_Wantdrain
, &dev
->flags
) ||
1365 test_bit(R5_InJournal
, &dev
->flags
))) ||
1366 (srctype
== SYNDROME_SRC_WRITTEN
&&
1368 if (test_bit(R5_InJournal
, &dev
->flags
))
1369 srcs
[slot
] = sh
->dev
[i
].orig_page
;
1371 srcs
[slot
] = sh
->dev
[i
].page
;
1373 i
= raid6_next_disk(i
, disks
);
1374 } while (i
!= d0_idx
);
1376 return syndrome_disks
;
1379 static struct dma_async_tx_descriptor
*
1380 ops_run_compute6_1(struct stripe_head
*sh
, struct raid5_percpu
*percpu
)
1382 int disks
= sh
->disks
;
1383 struct page
**blocks
= to_addr_page(percpu
, 0);
1385 int qd_idx
= sh
->qd_idx
;
1386 struct dma_async_tx_descriptor
*tx
;
1387 struct async_submit_ctl submit
;
1393 BUG_ON(sh
->batch_head
);
1394 if (sh
->ops
.target
< 0)
1395 target
= sh
->ops
.target2
;
1396 else if (sh
->ops
.target2
< 0)
1397 target
= sh
->ops
.target
;
1399 /* we should only have one valid target */
1402 pr_debug("%s: stripe %llu block: %d\n",
1403 __func__
, (unsigned long long)sh
->sector
, target
);
1405 tgt
= &sh
->dev
[target
];
1406 BUG_ON(!test_bit(R5_Wantcompute
, &tgt
->flags
));
1409 atomic_inc(&sh
->count
);
1411 if (target
== qd_idx
) {
1412 count
= set_syndrome_sources(blocks
, sh
, SYNDROME_SRC_ALL
);
1413 blocks
[count
] = NULL
; /* regenerating p is not necessary */
1414 BUG_ON(blocks
[count
+1] != dest
); /* q should already be set */
1415 init_async_submit(&submit
, ASYNC_TX_FENCE
, NULL
,
1416 ops_complete_compute
, sh
,
1417 to_addr_conv(sh
, percpu
, 0));
1418 tx
= async_gen_syndrome(blocks
, 0, count
+2, STRIPE_SIZE
, &submit
);
1420 /* Compute any data- or p-drive using XOR */
1422 for (i
= disks
; i
-- ; ) {
1423 if (i
== target
|| i
== qd_idx
)
1425 blocks
[count
++] = sh
->dev
[i
].page
;
1428 init_async_submit(&submit
, ASYNC_TX_FENCE
|ASYNC_TX_XOR_ZERO_DST
,
1429 NULL
, ops_complete_compute
, sh
,
1430 to_addr_conv(sh
, percpu
, 0));
1431 tx
= async_xor(dest
, blocks
, 0, count
, STRIPE_SIZE
, &submit
);
1437 static struct dma_async_tx_descriptor
*
1438 ops_run_compute6_2(struct stripe_head
*sh
, struct raid5_percpu
*percpu
)
1440 int i
, count
, disks
= sh
->disks
;
1441 int syndrome_disks
= sh
->ddf_layout
? disks
: disks
-2;
1442 int d0_idx
= raid6_d0(sh
);
1443 int faila
= -1, failb
= -1;
1444 int target
= sh
->ops
.target
;
1445 int target2
= sh
->ops
.target2
;
1446 struct r5dev
*tgt
= &sh
->dev
[target
];
1447 struct r5dev
*tgt2
= &sh
->dev
[target2
];
1448 struct dma_async_tx_descriptor
*tx
;
1449 struct page
**blocks
= to_addr_page(percpu
, 0);
1450 struct async_submit_ctl submit
;
1452 BUG_ON(sh
->batch_head
);
1453 pr_debug("%s: stripe %llu block1: %d block2: %d\n",
1454 __func__
, (unsigned long long)sh
->sector
, target
, target2
);
1455 BUG_ON(target
< 0 || target2
< 0);
1456 BUG_ON(!test_bit(R5_Wantcompute
, &tgt
->flags
));
1457 BUG_ON(!test_bit(R5_Wantcompute
, &tgt2
->flags
));
1459 /* we need to open-code set_syndrome_sources to handle the
1460 * slot number conversion for 'faila' and 'failb'
1462 for (i
= 0; i
< disks
; i
++)
1467 int slot
= raid6_idx_to_slot(i
, sh
, &count
, syndrome_disks
);
1469 blocks
[slot
] = sh
->dev
[i
].page
;
1475 i
= raid6_next_disk(i
, disks
);
1476 } while (i
!= d0_idx
);
1478 BUG_ON(faila
== failb
);
1481 pr_debug("%s: stripe: %llu faila: %d failb: %d\n",
1482 __func__
, (unsigned long long)sh
->sector
, faila
, failb
);
1484 atomic_inc(&sh
->count
);
1486 if (failb
== syndrome_disks
+1) {
1487 /* Q disk is one of the missing disks */
1488 if (faila
== syndrome_disks
) {
1489 /* Missing P+Q, just recompute */
1490 init_async_submit(&submit
, ASYNC_TX_FENCE
, NULL
,
1491 ops_complete_compute
, sh
,
1492 to_addr_conv(sh
, percpu
, 0));
1493 return async_gen_syndrome(blocks
, 0, syndrome_disks
+2,
1494 STRIPE_SIZE
, &submit
);
1498 int qd_idx
= sh
->qd_idx
;
1500 /* Missing D+Q: recompute D from P, then recompute Q */
1501 if (target
== qd_idx
)
1502 data_target
= target2
;
1504 data_target
= target
;
1507 for (i
= disks
; i
-- ; ) {
1508 if (i
== data_target
|| i
== qd_idx
)
1510 blocks
[count
++] = sh
->dev
[i
].page
;
1512 dest
= sh
->dev
[data_target
].page
;
1513 init_async_submit(&submit
,
1514 ASYNC_TX_FENCE
|ASYNC_TX_XOR_ZERO_DST
,
1516 to_addr_conv(sh
, percpu
, 0));
1517 tx
= async_xor(dest
, blocks
, 0, count
, STRIPE_SIZE
,
1520 count
= set_syndrome_sources(blocks
, sh
, SYNDROME_SRC_ALL
);
1521 init_async_submit(&submit
, ASYNC_TX_FENCE
, tx
,
1522 ops_complete_compute
, sh
,
1523 to_addr_conv(sh
, percpu
, 0));
1524 return async_gen_syndrome(blocks
, 0, count
+2,
1525 STRIPE_SIZE
, &submit
);
1528 init_async_submit(&submit
, ASYNC_TX_FENCE
, NULL
,
1529 ops_complete_compute
, sh
,
1530 to_addr_conv(sh
, percpu
, 0));
1531 if (failb
== syndrome_disks
) {
1532 /* We're missing D+P. */
1533 return async_raid6_datap_recov(syndrome_disks
+2,
1537 /* We're missing D+D. */
1538 return async_raid6_2data_recov(syndrome_disks
+2,
1539 STRIPE_SIZE
, faila
, failb
,
1545 static void ops_complete_prexor(void *stripe_head_ref
)
1547 struct stripe_head
*sh
= stripe_head_ref
;
1549 pr_debug("%s: stripe %llu\n", __func__
,
1550 (unsigned long long)sh
->sector
);
1552 if (r5c_is_writeback(sh
->raid_conf
->log
))
1554 * raid5-cache write back uses orig_page during prexor.
1555 * After prexor, it is time to free orig_page
1557 r5c_release_extra_page(sh
);
1560 static struct dma_async_tx_descriptor
*
1561 ops_run_prexor5(struct stripe_head
*sh
, struct raid5_percpu
*percpu
,
1562 struct dma_async_tx_descriptor
*tx
)
1564 int disks
= sh
->disks
;
1565 struct page
**xor_srcs
= to_addr_page(percpu
, 0);
1566 int count
= 0, pd_idx
= sh
->pd_idx
, i
;
1567 struct async_submit_ctl submit
;
1569 /* existing parity data subtracted */
1570 struct page
*xor_dest
= xor_srcs
[count
++] = sh
->dev
[pd_idx
].page
;
1572 BUG_ON(sh
->batch_head
);
1573 pr_debug("%s: stripe %llu\n", __func__
,
1574 (unsigned long long)sh
->sector
);
1576 for (i
= disks
; i
--; ) {
1577 struct r5dev
*dev
= &sh
->dev
[i
];
1578 /* Only process blocks that are known to be uptodate */
1579 if (test_bit(R5_InJournal
, &dev
->flags
))
1580 xor_srcs
[count
++] = dev
->orig_page
;
1581 else if (test_bit(R5_Wantdrain
, &dev
->flags
))
1582 xor_srcs
[count
++] = dev
->page
;
1585 init_async_submit(&submit
, ASYNC_TX_FENCE
|ASYNC_TX_XOR_DROP_DST
, tx
,
1586 ops_complete_prexor
, sh
, to_addr_conv(sh
, percpu
, 0));
1587 tx
= async_xor(xor_dest
, xor_srcs
, 0, count
, STRIPE_SIZE
, &submit
);
1592 static struct dma_async_tx_descriptor
*
1593 ops_run_prexor6(struct stripe_head
*sh
, struct raid5_percpu
*percpu
,
1594 struct dma_async_tx_descriptor
*tx
)
1596 struct page
**blocks
= to_addr_page(percpu
, 0);
1598 struct async_submit_ctl submit
;
1600 pr_debug("%s: stripe %llu\n", __func__
,
1601 (unsigned long long)sh
->sector
);
1603 count
= set_syndrome_sources(blocks
, sh
, SYNDROME_SRC_WANT_DRAIN
);
1605 init_async_submit(&submit
, ASYNC_TX_FENCE
|ASYNC_TX_PQ_XOR_DST
, tx
,
1606 ops_complete_prexor
, sh
, to_addr_conv(sh
, percpu
, 0));
1607 tx
= async_gen_syndrome(blocks
, 0, count
+2, STRIPE_SIZE
, &submit
);
1612 static struct dma_async_tx_descriptor
*
1613 ops_run_biodrain(struct stripe_head
*sh
, struct dma_async_tx_descriptor
*tx
)
1615 struct r5conf
*conf
= sh
->raid_conf
;
1616 int disks
= sh
->disks
;
1618 struct stripe_head
*head_sh
= sh
;
1620 pr_debug("%s: stripe %llu\n", __func__
,
1621 (unsigned long long)sh
->sector
);
1623 for (i
= disks
; i
--; ) {
1628 if (test_and_clear_bit(R5_Wantdrain
, &head_sh
->dev
[i
].flags
)) {
1634 * clear R5_InJournal, so when rewriting a page in
1635 * journal, it is not skipped by r5l_log_stripe()
1637 clear_bit(R5_InJournal
, &dev
->flags
);
1638 spin_lock_irq(&sh
->stripe_lock
);
1639 chosen
= dev
->towrite
;
1640 dev
->towrite
= NULL
;
1641 sh
->overwrite_disks
= 0;
1642 BUG_ON(dev
->written
);
1643 wbi
= dev
->written
= chosen
;
1644 spin_unlock_irq(&sh
->stripe_lock
);
1645 WARN_ON(dev
->page
!= dev
->orig_page
);
1647 while (wbi
&& wbi
->bi_iter
.bi_sector
<
1648 dev
->sector
+ STRIPE_SECTORS
) {
1649 if (wbi
->bi_opf
& REQ_FUA
)
1650 set_bit(R5_WantFUA
, &dev
->flags
);
1651 if (wbi
->bi_opf
& REQ_SYNC
)
1652 set_bit(R5_SyncIO
, &dev
->flags
);
1653 if (bio_op(wbi
) == REQ_OP_DISCARD
)
1654 set_bit(R5_Discard
, &dev
->flags
);
1656 tx
= async_copy_data(1, wbi
, &dev
->page
,
1657 dev
->sector
, tx
, sh
,
1658 r5c_is_writeback(conf
->log
));
1659 if (dev
->page
!= dev
->orig_page
&&
1660 !r5c_is_writeback(conf
->log
)) {
1661 set_bit(R5_SkipCopy
, &dev
->flags
);
1662 clear_bit(R5_UPTODATE
, &dev
->flags
);
1663 clear_bit(R5_OVERWRITE
, &dev
->flags
);
1666 wbi
= r5_next_bio(wbi
, dev
->sector
);
1669 if (head_sh
->batch_head
) {
1670 sh
= list_first_entry(&sh
->batch_list
,
1683 static void ops_complete_reconstruct(void *stripe_head_ref
)
1685 struct stripe_head
*sh
= stripe_head_ref
;
1686 int disks
= sh
->disks
;
1687 int pd_idx
= sh
->pd_idx
;
1688 int qd_idx
= sh
->qd_idx
;
1690 bool fua
= false, sync
= false, discard
= false;
1692 pr_debug("%s: stripe %llu\n", __func__
,
1693 (unsigned long long)sh
->sector
);
1695 for (i
= disks
; i
--; ) {
1696 fua
|= test_bit(R5_WantFUA
, &sh
->dev
[i
].flags
);
1697 sync
|= test_bit(R5_SyncIO
, &sh
->dev
[i
].flags
);
1698 discard
|= test_bit(R5_Discard
, &sh
->dev
[i
].flags
);
1701 for (i
= disks
; i
--; ) {
1702 struct r5dev
*dev
= &sh
->dev
[i
];
1704 if (dev
->written
|| i
== pd_idx
|| i
== qd_idx
) {
1705 if (!discard
&& !test_bit(R5_SkipCopy
, &dev
->flags
))
1706 set_bit(R5_UPTODATE
, &dev
->flags
);
1708 set_bit(R5_WantFUA
, &dev
->flags
);
1710 set_bit(R5_SyncIO
, &dev
->flags
);
1714 if (sh
->reconstruct_state
== reconstruct_state_drain_run
)
1715 sh
->reconstruct_state
= reconstruct_state_drain_result
;
1716 else if (sh
->reconstruct_state
== reconstruct_state_prexor_drain_run
)
1717 sh
->reconstruct_state
= reconstruct_state_prexor_drain_result
;
1719 BUG_ON(sh
->reconstruct_state
!= reconstruct_state_run
);
1720 sh
->reconstruct_state
= reconstruct_state_result
;
1723 set_bit(STRIPE_HANDLE
, &sh
->state
);
1724 raid5_release_stripe(sh
);
1728 ops_run_reconstruct5(struct stripe_head
*sh
, struct raid5_percpu
*percpu
,
1729 struct dma_async_tx_descriptor
*tx
)
1731 int disks
= sh
->disks
;
1732 struct page
**xor_srcs
;
1733 struct async_submit_ctl submit
;
1734 int count
, pd_idx
= sh
->pd_idx
, i
;
1735 struct page
*xor_dest
;
1737 unsigned long flags
;
1739 struct stripe_head
*head_sh
= sh
;
1742 pr_debug("%s: stripe %llu\n", __func__
,
1743 (unsigned long long)sh
->sector
);
1745 for (i
= 0; i
< sh
->disks
; i
++) {
1748 if (!test_bit(R5_Discard
, &sh
->dev
[i
].flags
))
1751 if (i
>= sh
->disks
) {
1752 atomic_inc(&sh
->count
);
1753 set_bit(R5_Discard
, &sh
->dev
[pd_idx
].flags
);
1754 ops_complete_reconstruct(sh
);
1759 xor_srcs
= to_addr_page(percpu
, j
);
1760 /* check if prexor is active which means only process blocks
1761 * that are part of a read-modify-write (written)
1763 if (head_sh
->reconstruct_state
== reconstruct_state_prexor_drain_run
) {
1765 xor_dest
= xor_srcs
[count
++] = sh
->dev
[pd_idx
].page
;
1766 for (i
= disks
; i
--; ) {
1767 struct r5dev
*dev
= &sh
->dev
[i
];
1768 if (head_sh
->dev
[i
].written
||
1769 test_bit(R5_InJournal
, &head_sh
->dev
[i
].flags
))
1770 xor_srcs
[count
++] = dev
->page
;
1773 xor_dest
= sh
->dev
[pd_idx
].page
;
1774 for (i
= disks
; i
--; ) {
1775 struct r5dev
*dev
= &sh
->dev
[i
];
1777 xor_srcs
[count
++] = dev
->page
;
1781 /* 1/ if we prexor'd then the dest is reused as a source
1782 * 2/ if we did not prexor then we are redoing the parity
1783 * set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST
1784 * for the synchronous xor case
1786 last_stripe
= !head_sh
->batch_head
||
1787 list_first_entry(&sh
->batch_list
,
1788 struct stripe_head
, batch_list
) == head_sh
;
1790 flags
= ASYNC_TX_ACK
|
1791 (prexor
? ASYNC_TX_XOR_DROP_DST
: ASYNC_TX_XOR_ZERO_DST
);
1793 atomic_inc(&head_sh
->count
);
1794 init_async_submit(&submit
, flags
, tx
, ops_complete_reconstruct
, head_sh
,
1795 to_addr_conv(sh
, percpu
, j
));
1797 flags
= prexor
? ASYNC_TX_XOR_DROP_DST
: ASYNC_TX_XOR_ZERO_DST
;
1798 init_async_submit(&submit
, flags
, tx
, NULL
, NULL
,
1799 to_addr_conv(sh
, percpu
, j
));
1802 if (unlikely(count
== 1))
1803 tx
= async_memcpy(xor_dest
, xor_srcs
[0], 0, 0, STRIPE_SIZE
, &submit
);
1805 tx
= async_xor(xor_dest
, xor_srcs
, 0, count
, STRIPE_SIZE
, &submit
);
1808 sh
= list_first_entry(&sh
->batch_list
, struct stripe_head
,
1815 ops_run_reconstruct6(struct stripe_head
*sh
, struct raid5_percpu
*percpu
,
1816 struct dma_async_tx_descriptor
*tx
)
1818 struct async_submit_ctl submit
;
1819 struct page
**blocks
;
1820 int count
, i
, j
= 0;
1821 struct stripe_head
*head_sh
= sh
;
1824 unsigned long txflags
;
1826 pr_debug("%s: stripe %llu\n", __func__
, (unsigned long long)sh
->sector
);
1828 for (i
= 0; i
< sh
->disks
; i
++) {
1829 if (sh
->pd_idx
== i
|| sh
->qd_idx
== i
)
1831 if (!test_bit(R5_Discard
, &sh
->dev
[i
].flags
))
1834 if (i
>= sh
->disks
) {
1835 atomic_inc(&sh
->count
);
1836 set_bit(R5_Discard
, &sh
->dev
[sh
->pd_idx
].flags
);
1837 set_bit(R5_Discard
, &sh
->dev
[sh
->qd_idx
].flags
);
1838 ops_complete_reconstruct(sh
);
1843 blocks
= to_addr_page(percpu
, j
);
1845 if (sh
->reconstruct_state
== reconstruct_state_prexor_drain_run
) {
1846 synflags
= SYNDROME_SRC_WRITTEN
;
1847 txflags
= ASYNC_TX_ACK
| ASYNC_TX_PQ_XOR_DST
;
1849 synflags
= SYNDROME_SRC_ALL
;
1850 txflags
= ASYNC_TX_ACK
;
1853 count
= set_syndrome_sources(blocks
, sh
, synflags
);
1854 last_stripe
= !head_sh
->batch_head
||
1855 list_first_entry(&sh
->batch_list
,
1856 struct stripe_head
, batch_list
) == head_sh
;
1859 atomic_inc(&head_sh
->count
);
1860 init_async_submit(&submit
, txflags
, tx
, ops_complete_reconstruct
,
1861 head_sh
, to_addr_conv(sh
, percpu
, j
));
1863 init_async_submit(&submit
, 0, tx
, NULL
, NULL
,
1864 to_addr_conv(sh
, percpu
, j
));
1865 tx
= async_gen_syndrome(blocks
, 0, count
+2, STRIPE_SIZE
, &submit
);
1868 sh
= list_first_entry(&sh
->batch_list
, struct stripe_head
,
1874 static void ops_complete_check(void *stripe_head_ref
)
1876 struct stripe_head
*sh
= stripe_head_ref
;
1878 pr_debug("%s: stripe %llu\n", __func__
,
1879 (unsigned long long)sh
->sector
);
1881 sh
->check_state
= check_state_check_result
;
1882 set_bit(STRIPE_HANDLE
, &sh
->state
);
1883 raid5_release_stripe(sh
);
1886 static void ops_run_check_p(struct stripe_head
*sh
, struct raid5_percpu
*percpu
)
1888 int disks
= sh
->disks
;
1889 int pd_idx
= sh
->pd_idx
;
1890 int qd_idx
= sh
->qd_idx
;
1891 struct page
*xor_dest
;
1892 struct page
**xor_srcs
= to_addr_page(percpu
, 0);
1893 struct dma_async_tx_descriptor
*tx
;
1894 struct async_submit_ctl submit
;
1898 pr_debug("%s: stripe %llu\n", __func__
,
1899 (unsigned long long)sh
->sector
);
1901 BUG_ON(sh
->batch_head
);
1903 xor_dest
= sh
->dev
[pd_idx
].page
;
1904 xor_srcs
[count
++] = xor_dest
;
1905 for (i
= disks
; i
--; ) {
1906 if (i
== pd_idx
|| i
== qd_idx
)
1908 xor_srcs
[count
++] = sh
->dev
[i
].page
;
1911 init_async_submit(&submit
, 0, NULL
, NULL
, NULL
,
1912 to_addr_conv(sh
, percpu
, 0));
1913 tx
= async_xor_val(xor_dest
, xor_srcs
, 0, count
, STRIPE_SIZE
,
1914 &sh
->ops
.zero_sum_result
, &submit
);
1916 atomic_inc(&sh
->count
);
1917 init_async_submit(&submit
, ASYNC_TX_ACK
, tx
, ops_complete_check
, sh
, NULL
);
1918 tx
= async_trigger_callback(&submit
);
1921 static void ops_run_check_pq(struct stripe_head
*sh
, struct raid5_percpu
*percpu
, int checkp
)
1923 struct page
**srcs
= to_addr_page(percpu
, 0);
1924 struct async_submit_ctl submit
;
1927 pr_debug("%s: stripe %llu checkp: %d\n", __func__
,
1928 (unsigned long long)sh
->sector
, checkp
);
1930 BUG_ON(sh
->batch_head
);
1931 count
= set_syndrome_sources(srcs
, sh
, SYNDROME_SRC_ALL
);
1935 atomic_inc(&sh
->count
);
1936 init_async_submit(&submit
, ASYNC_TX_ACK
, NULL
, ops_complete_check
,
1937 sh
, to_addr_conv(sh
, percpu
, 0));
1938 async_syndrome_val(srcs
, 0, count
+2, STRIPE_SIZE
,
1939 &sh
->ops
.zero_sum_result
, percpu
->spare_page
, &submit
);
1942 static void raid_run_ops(struct stripe_head
*sh
, unsigned long ops_request
)
1944 int overlap_clear
= 0, i
, disks
= sh
->disks
;
1945 struct dma_async_tx_descriptor
*tx
= NULL
;
1946 struct r5conf
*conf
= sh
->raid_conf
;
1947 int level
= conf
->level
;
1948 struct raid5_percpu
*percpu
;
1952 percpu
= per_cpu_ptr(conf
->percpu
, cpu
);
1953 if (test_bit(STRIPE_OP_BIOFILL
, &ops_request
)) {
1954 ops_run_biofill(sh
);
1958 if (test_bit(STRIPE_OP_COMPUTE_BLK
, &ops_request
)) {
1960 tx
= ops_run_compute5(sh
, percpu
);
1962 if (sh
->ops
.target2
< 0 || sh
->ops
.target
< 0)
1963 tx
= ops_run_compute6_1(sh
, percpu
);
1965 tx
= ops_run_compute6_2(sh
, percpu
);
1967 /* terminate the chain if reconstruct is not set to be run */
1968 if (tx
&& !test_bit(STRIPE_OP_RECONSTRUCT
, &ops_request
))
1972 if (test_bit(STRIPE_OP_PREXOR
, &ops_request
)) {
1974 tx
= ops_run_prexor5(sh
, percpu
, tx
);
1976 tx
= ops_run_prexor6(sh
, percpu
, tx
);
1979 if (test_bit(STRIPE_OP_BIODRAIN
, &ops_request
)) {
1980 tx
= ops_run_biodrain(sh
, tx
);
1984 if (test_bit(STRIPE_OP_RECONSTRUCT
, &ops_request
)) {
1986 ops_run_reconstruct5(sh
, percpu
, tx
);
1988 ops_run_reconstruct6(sh
, percpu
, tx
);
1991 if (test_bit(STRIPE_OP_CHECK
, &ops_request
)) {
1992 if (sh
->check_state
== check_state_run
)
1993 ops_run_check_p(sh
, percpu
);
1994 else if (sh
->check_state
== check_state_run_q
)
1995 ops_run_check_pq(sh
, percpu
, 0);
1996 else if (sh
->check_state
== check_state_run_pq
)
1997 ops_run_check_pq(sh
, percpu
, 1);
2002 if (overlap_clear
&& !sh
->batch_head
)
2003 for (i
= disks
; i
--; ) {
2004 struct r5dev
*dev
= &sh
->dev
[i
];
2005 if (test_and_clear_bit(R5_Overlap
, &dev
->flags
))
2006 wake_up(&sh
->raid_conf
->wait_for_overlap
);
2011 static struct stripe_head
*alloc_stripe(struct kmem_cache
*sc
, gfp_t gfp
,
2014 struct stripe_head
*sh
;
2017 sh
= kmem_cache_zalloc(sc
, gfp
);
2019 spin_lock_init(&sh
->stripe_lock
);
2020 spin_lock_init(&sh
->batch_lock
);
2021 INIT_LIST_HEAD(&sh
->batch_list
);
2022 INIT_LIST_HEAD(&sh
->lru
);
2023 INIT_LIST_HEAD(&sh
->r5c
);
2024 INIT_LIST_HEAD(&sh
->log_list
);
2025 atomic_set(&sh
->count
, 1);
2026 sh
->log_start
= MaxSector
;
2027 for (i
= 0; i
< disks
; i
++) {
2028 struct r5dev
*dev
= &sh
->dev
[i
];
2030 bio_init(&dev
->req
, &dev
->vec
, 1);
2031 bio_init(&dev
->rreq
, &dev
->rvec
, 1);
2036 static int grow_one_stripe(struct r5conf
*conf
, gfp_t gfp
)
2038 struct stripe_head
*sh
;
2040 sh
= alloc_stripe(conf
->slab_cache
, gfp
, conf
->pool_size
);
2044 sh
->raid_conf
= conf
;
2046 if (grow_buffers(sh
, gfp
)) {
2048 kmem_cache_free(conf
->slab_cache
, sh
);
2051 sh
->hash_lock_index
=
2052 conf
->max_nr_stripes
% NR_STRIPE_HASH_LOCKS
;
2053 /* we just created an active stripe so... */
2054 atomic_inc(&conf
->active_stripes
);
2056 raid5_release_stripe(sh
);
2057 conf
->max_nr_stripes
++;
2061 static int grow_stripes(struct r5conf
*conf
, int num
)
2063 struct kmem_cache
*sc
;
2064 int devs
= max(conf
->raid_disks
, conf
->previous_raid_disks
);
2066 if (conf
->mddev
->gendisk
)
2067 sprintf(conf
->cache_name
[0],
2068 "raid%d-%s", conf
->level
, mdname(conf
->mddev
));
2070 sprintf(conf
->cache_name
[0],
2071 "raid%d-%p", conf
->level
, conf
->mddev
);
2072 sprintf(conf
->cache_name
[1], "%s-alt", conf
->cache_name
[0]);
2074 conf
->active_name
= 0;
2075 sc
= kmem_cache_create(conf
->cache_name
[conf
->active_name
],
2076 sizeof(struct stripe_head
)+(devs
-1)*sizeof(struct r5dev
),
2080 conf
->slab_cache
= sc
;
2081 conf
->pool_size
= devs
;
2083 if (!grow_one_stripe(conf
, GFP_KERNEL
))
2090 * scribble_len - return the required size of the scribble region
2091 * @num - total number of disks in the array
2093 * The size must be enough to contain:
2094 * 1/ a struct page pointer for each device in the array +2
2095 * 2/ room to convert each entry in (1) to its corresponding dma
2096 * (dma_map_page()) or page (page_address()) address.
2098 * Note: the +2 is for the destination buffers of the ddf/raid6 case where we
2099 * calculate over all devices (not just the data blocks), using zeros in place
2100 * of the P and Q blocks.
2102 static struct flex_array
*scribble_alloc(int num
, int cnt
, gfp_t flags
)
2104 struct flex_array
*ret
;
2107 len
= sizeof(struct page
*) * (num
+2) + sizeof(addr_conv_t
) * (num
+2);
2108 ret
= flex_array_alloc(len
, cnt
, flags
);
2111 /* always prealloc all elements, so no locking is required */
2112 if (flex_array_prealloc(ret
, 0, cnt
, flags
)) {
2113 flex_array_free(ret
);
2119 static int resize_chunks(struct r5conf
*conf
, int new_disks
, int new_sectors
)
2125 * Never shrink. And mddev_suspend() could deadlock if this is called
2126 * from raid5d. In that case, scribble_disks and scribble_sectors
2127 * should equal to new_disks and new_sectors
2129 if (conf
->scribble_disks
>= new_disks
&&
2130 conf
->scribble_sectors
>= new_sectors
)
2132 mddev_suspend(conf
->mddev
);
2134 for_each_present_cpu(cpu
) {
2135 struct raid5_percpu
*percpu
;
2136 struct flex_array
*scribble
;
2138 percpu
= per_cpu_ptr(conf
->percpu
, cpu
);
2139 scribble
= scribble_alloc(new_disks
,
2140 new_sectors
/ STRIPE_SECTORS
,
2144 flex_array_free(percpu
->scribble
);
2145 percpu
->scribble
= scribble
;
2152 mddev_resume(conf
->mddev
);
2154 conf
->scribble_disks
= new_disks
;
2155 conf
->scribble_sectors
= new_sectors
;
2160 static int resize_stripes(struct r5conf
*conf
, int newsize
)
2162 /* Make all the stripes able to hold 'newsize' devices.
2163 * New slots in each stripe get 'page' set to a new page.
2165 * This happens in stages:
2166 * 1/ create a new kmem_cache and allocate the required number of
2168 * 2/ gather all the old stripe_heads and transfer the pages across
2169 * to the new stripe_heads. This will have the side effect of
2170 * freezing the array as once all stripe_heads have been collected,
2171 * no IO will be possible. Old stripe heads are freed once their
2172 * pages have been transferred over, and the old kmem_cache is
2173 * freed when all stripes are done.
2174 * 3/ reallocate conf->disks to be suitable bigger. If this fails,
2175 * we simple return a failre status - no need to clean anything up.
2176 * 4/ allocate new pages for the new slots in the new stripe_heads.
2177 * If this fails, we don't bother trying the shrink the
2178 * stripe_heads down again, we just leave them as they are.
2179 * As each stripe_head is processed the new one is released into
2182 * Once step2 is started, we cannot afford to wait for a write,
2183 * so we use GFP_NOIO allocations.
2185 struct stripe_head
*osh
, *nsh
;
2186 LIST_HEAD(newstripes
);
2187 struct disk_info
*ndisks
;
2189 struct kmem_cache
*sc
;
2193 if (newsize
<= conf
->pool_size
)
2194 return 0; /* never bother to shrink */
2196 err
= md_allow_write(conf
->mddev
);
2201 sc
= kmem_cache_create(conf
->cache_name
[1-conf
->active_name
],
2202 sizeof(struct stripe_head
)+(newsize
-1)*sizeof(struct r5dev
),
2207 /* Need to ensure auto-resizing doesn't interfere */
2208 mutex_lock(&conf
->cache_size_mutex
);
2210 for (i
= conf
->max_nr_stripes
; i
; i
--) {
2211 nsh
= alloc_stripe(sc
, GFP_KERNEL
, newsize
);
2215 nsh
->raid_conf
= conf
;
2216 list_add(&nsh
->lru
, &newstripes
);
2219 /* didn't get enough, give up */
2220 while (!list_empty(&newstripes
)) {
2221 nsh
= list_entry(newstripes
.next
, struct stripe_head
, lru
);
2222 list_del(&nsh
->lru
);
2223 kmem_cache_free(sc
, nsh
);
2225 kmem_cache_destroy(sc
);
2226 mutex_unlock(&conf
->cache_size_mutex
);
2229 /* Step 2 - Must use GFP_NOIO now.
2230 * OK, we have enough stripes, start collecting inactive
2231 * stripes and copying them over
2235 list_for_each_entry(nsh
, &newstripes
, lru
) {
2236 lock_device_hash_lock(conf
, hash
);
2237 wait_event_cmd(conf
->wait_for_stripe
,
2238 !list_empty(conf
->inactive_list
+ hash
),
2239 unlock_device_hash_lock(conf
, hash
),
2240 lock_device_hash_lock(conf
, hash
));
2241 osh
= get_free_stripe(conf
, hash
);
2242 unlock_device_hash_lock(conf
, hash
);
2244 for(i
=0; i
<conf
->pool_size
; i
++) {
2245 nsh
->dev
[i
].page
= osh
->dev
[i
].page
;
2246 nsh
->dev
[i
].orig_page
= osh
->dev
[i
].page
;
2248 nsh
->hash_lock_index
= hash
;
2249 kmem_cache_free(conf
->slab_cache
, osh
);
2251 if (cnt
>= conf
->max_nr_stripes
/ NR_STRIPE_HASH_LOCKS
+
2252 !!((conf
->max_nr_stripes
% NR_STRIPE_HASH_LOCKS
) > hash
)) {
2257 kmem_cache_destroy(conf
->slab_cache
);
2260 * At this point, we are holding all the stripes so the array
2261 * is completely stalled, so now is a good time to resize
2262 * conf->disks and the scribble region
2264 ndisks
= kzalloc(newsize
* sizeof(struct disk_info
), GFP_NOIO
);
2266 for (i
= 0; i
< conf
->pool_size
; i
++)
2267 ndisks
[i
] = conf
->disks
[i
];
2269 for (i
= conf
->pool_size
; i
< newsize
; i
++) {
2270 ndisks
[i
].extra_page
= alloc_page(GFP_NOIO
);
2271 if (!ndisks
[i
].extra_page
)
2276 for (i
= conf
->pool_size
; i
< newsize
; i
++)
2277 if (ndisks
[i
].extra_page
)
2278 put_page(ndisks
[i
].extra_page
);
2282 conf
->disks
= ndisks
;
2287 mutex_unlock(&conf
->cache_size_mutex
);
2288 /* Step 4, return new stripes to service */
2289 while(!list_empty(&newstripes
)) {
2290 nsh
= list_entry(newstripes
.next
, struct stripe_head
, lru
);
2291 list_del_init(&nsh
->lru
);
2293 for (i
=conf
->raid_disks
; i
< newsize
; i
++)
2294 if (nsh
->dev
[i
].page
== NULL
) {
2295 struct page
*p
= alloc_page(GFP_NOIO
);
2296 nsh
->dev
[i
].page
= p
;
2297 nsh
->dev
[i
].orig_page
= p
;
2301 raid5_release_stripe(nsh
);
2303 /* critical section pass, GFP_NOIO no longer needed */
2305 conf
->slab_cache
= sc
;
2306 conf
->active_name
= 1-conf
->active_name
;
2308 conf
->pool_size
= newsize
;
2312 static int drop_one_stripe(struct r5conf
*conf
)
2314 struct stripe_head
*sh
;
2315 int hash
= (conf
->max_nr_stripes
- 1) & STRIPE_HASH_LOCKS_MASK
;
2317 spin_lock_irq(conf
->hash_locks
+ hash
);
2318 sh
= get_free_stripe(conf
, hash
);
2319 spin_unlock_irq(conf
->hash_locks
+ hash
);
2322 BUG_ON(atomic_read(&sh
->count
));
2324 kmem_cache_free(conf
->slab_cache
, sh
);
2325 atomic_dec(&conf
->active_stripes
);
2326 conf
->max_nr_stripes
--;
2330 static void shrink_stripes(struct r5conf
*conf
)
2332 while (conf
->max_nr_stripes
&&
2333 drop_one_stripe(conf
))
2336 kmem_cache_destroy(conf
->slab_cache
);
2337 conf
->slab_cache
= NULL
;
2340 static void raid5_end_read_request(struct bio
* bi
)
2342 struct stripe_head
*sh
= bi
->bi_private
;
2343 struct r5conf
*conf
= sh
->raid_conf
;
2344 int disks
= sh
->disks
, i
;
2345 char b
[BDEVNAME_SIZE
];
2346 struct md_rdev
*rdev
= NULL
;
2349 for (i
=0 ; i
<disks
; i
++)
2350 if (bi
== &sh
->dev
[i
].req
)
2353 pr_debug("end_read_request %llu/%d, count: %d, error %d.\n",
2354 (unsigned long long)sh
->sector
, i
, atomic_read(&sh
->count
),
2361 if (test_bit(R5_ReadRepl
, &sh
->dev
[i
].flags
))
2362 /* If replacement finished while this request was outstanding,
2363 * 'replacement' might be NULL already.
2364 * In that case it moved down to 'rdev'.
2365 * rdev is not removed until all requests are finished.
2367 rdev
= conf
->disks
[i
].replacement
;
2369 rdev
= conf
->disks
[i
].rdev
;
2371 if (use_new_offset(conf
, sh
))
2372 s
= sh
->sector
+ rdev
->new_data_offset
;
2374 s
= sh
->sector
+ rdev
->data_offset
;
2375 if (!bi
->bi_error
) {
2376 set_bit(R5_UPTODATE
, &sh
->dev
[i
].flags
);
2377 if (test_bit(R5_ReadError
, &sh
->dev
[i
].flags
)) {
2378 /* Note that this cannot happen on a
2379 * replacement device. We just fail those on
2382 pr_info_ratelimited(
2383 "md/raid:%s: read error corrected (%lu sectors at %llu on %s)\n",
2384 mdname(conf
->mddev
), STRIPE_SECTORS
,
2385 (unsigned long long)s
,
2386 bdevname(rdev
->bdev
, b
));
2387 atomic_add(STRIPE_SECTORS
, &rdev
->corrected_errors
);
2388 clear_bit(R5_ReadError
, &sh
->dev
[i
].flags
);
2389 clear_bit(R5_ReWrite
, &sh
->dev
[i
].flags
);
2390 } else if (test_bit(R5_ReadNoMerge
, &sh
->dev
[i
].flags
))
2391 clear_bit(R5_ReadNoMerge
, &sh
->dev
[i
].flags
);
2393 if (test_bit(R5_InJournal
, &sh
->dev
[i
].flags
))
2395 * end read for a page in journal, this
2396 * must be preparing for prexor in rmw
2398 set_bit(R5_OrigPageUPTDODATE
, &sh
->dev
[i
].flags
);
2400 if (atomic_read(&rdev
->read_errors
))
2401 atomic_set(&rdev
->read_errors
, 0);
2403 const char *bdn
= bdevname(rdev
->bdev
, b
);
2407 clear_bit(R5_UPTODATE
, &sh
->dev
[i
].flags
);
2408 atomic_inc(&rdev
->read_errors
);
2409 if (test_bit(R5_ReadRepl
, &sh
->dev
[i
].flags
))
2410 pr_warn_ratelimited(
2411 "md/raid:%s: read error on replacement device (sector %llu on %s).\n",
2412 mdname(conf
->mddev
),
2413 (unsigned long long)s
,
2415 else if (conf
->mddev
->degraded
>= conf
->max_degraded
) {
2417 pr_warn_ratelimited(
2418 "md/raid:%s: read error not correctable (sector %llu on %s).\n",
2419 mdname(conf
->mddev
),
2420 (unsigned long long)s
,
2422 } else if (test_bit(R5_ReWrite
, &sh
->dev
[i
].flags
)) {
2425 pr_warn_ratelimited(
2426 "md/raid:%s: read error NOT corrected!! (sector %llu on %s).\n",
2427 mdname(conf
->mddev
),
2428 (unsigned long long)s
,
2430 } else if (atomic_read(&rdev
->read_errors
)
2431 > conf
->max_nr_stripes
)
2432 pr_warn("md/raid:%s: Too many read errors, failing device %s.\n",
2433 mdname(conf
->mddev
), bdn
);
2436 if (set_bad
&& test_bit(In_sync
, &rdev
->flags
)
2437 && !test_bit(R5_ReadNoMerge
, &sh
->dev
[i
].flags
))
2440 if (test_bit(R5_ReadNoMerge
, &sh
->dev
[i
].flags
)) {
2441 set_bit(R5_ReadError
, &sh
->dev
[i
].flags
);
2442 clear_bit(R5_ReadNoMerge
, &sh
->dev
[i
].flags
);
2444 set_bit(R5_ReadNoMerge
, &sh
->dev
[i
].flags
);
2446 clear_bit(R5_ReadError
, &sh
->dev
[i
].flags
);
2447 clear_bit(R5_ReWrite
, &sh
->dev
[i
].flags
);
2449 && test_bit(In_sync
, &rdev
->flags
)
2450 && rdev_set_badblocks(
2451 rdev
, sh
->sector
, STRIPE_SECTORS
, 0)))
2452 md_error(conf
->mddev
, rdev
);
2455 rdev_dec_pending(rdev
, conf
->mddev
);
2457 clear_bit(R5_LOCKED
, &sh
->dev
[i
].flags
);
2458 set_bit(STRIPE_HANDLE
, &sh
->state
);
2459 raid5_release_stripe(sh
);
2462 static void raid5_end_write_request(struct bio
*bi
)
2464 struct stripe_head
*sh
= bi
->bi_private
;
2465 struct r5conf
*conf
= sh
->raid_conf
;
2466 int disks
= sh
->disks
, i
;
2467 struct md_rdev
*uninitialized_var(rdev
);
2470 int replacement
= 0;
2472 for (i
= 0 ; i
< disks
; i
++) {
2473 if (bi
== &sh
->dev
[i
].req
) {
2474 rdev
= conf
->disks
[i
].rdev
;
2477 if (bi
== &sh
->dev
[i
].rreq
) {
2478 rdev
= conf
->disks
[i
].replacement
;
2482 /* rdev was removed and 'replacement'
2483 * replaced it. rdev is not removed
2484 * until all requests are finished.
2486 rdev
= conf
->disks
[i
].rdev
;
2490 pr_debug("end_write_request %llu/%d, count %d, error: %d.\n",
2491 (unsigned long long)sh
->sector
, i
, atomic_read(&sh
->count
),
2501 md_error(conf
->mddev
, rdev
);
2502 else if (is_badblock(rdev
, sh
->sector
,
2504 &first_bad
, &bad_sectors
))
2505 set_bit(R5_MadeGoodRepl
, &sh
->dev
[i
].flags
);
2508 set_bit(STRIPE_DEGRADED
, &sh
->state
);
2509 set_bit(WriteErrorSeen
, &rdev
->flags
);
2510 set_bit(R5_WriteError
, &sh
->dev
[i
].flags
);
2511 if (!test_and_set_bit(WantReplacement
, &rdev
->flags
))
2512 set_bit(MD_RECOVERY_NEEDED
,
2513 &rdev
->mddev
->recovery
);
2514 } else if (is_badblock(rdev
, sh
->sector
,
2516 &first_bad
, &bad_sectors
)) {
2517 set_bit(R5_MadeGood
, &sh
->dev
[i
].flags
);
2518 if (test_bit(R5_ReadError
, &sh
->dev
[i
].flags
))
2519 /* That was a successful write so make
2520 * sure it looks like we already did
2523 set_bit(R5_ReWrite
, &sh
->dev
[i
].flags
);
2526 rdev_dec_pending(rdev
, conf
->mddev
);
2528 if (sh
->batch_head
&& bi
->bi_error
&& !replacement
)
2529 set_bit(STRIPE_BATCH_ERR
, &sh
->batch_head
->state
);
2532 if (!test_and_clear_bit(R5_DOUBLE_LOCKED
, &sh
->dev
[i
].flags
))
2533 clear_bit(R5_LOCKED
, &sh
->dev
[i
].flags
);
2534 set_bit(STRIPE_HANDLE
, &sh
->state
);
2535 raid5_release_stripe(sh
);
2537 if (sh
->batch_head
&& sh
!= sh
->batch_head
)
2538 raid5_release_stripe(sh
->batch_head
);
2541 static void raid5_build_block(struct stripe_head
*sh
, int i
, int previous
)
2543 struct r5dev
*dev
= &sh
->dev
[i
];
2546 dev
->sector
= raid5_compute_blocknr(sh
, i
, previous
);
2549 static void raid5_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
2551 char b
[BDEVNAME_SIZE
];
2552 struct r5conf
*conf
= mddev
->private;
2553 unsigned long flags
;
2554 pr_debug("raid456: error called\n");
2556 spin_lock_irqsave(&conf
->device_lock
, flags
);
2557 clear_bit(In_sync
, &rdev
->flags
);
2558 mddev
->degraded
= raid5_calc_degraded(conf
);
2559 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
2560 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2562 set_bit(Blocked
, &rdev
->flags
);
2563 set_bit(Faulty
, &rdev
->flags
);
2564 set_mask_bits(&mddev
->sb_flags
, 0,
2565 BIT(MD_SB_CHANGE_DEVS
) | BIT(MD_SB_CHANGE_PENDING
));
2566 pr_crit("md/raid:%s: Disk failure on %s, disabling device.\n"
2567 "md/raid:%s: Operation continuing on %d devices.\n",
2569 bdevname(rdev
->bdev
, b
),
2571 conf
->raid_disks
- mddev
->degraded
);
2572 r5c_update_on_rdev_error(mddev
);
2576 * Input: a 'big' sector number,
2577 * Output: index of the data and parity disk, and the sector # in them.
2579 sector_t
raid5_compute_sector(struct r5conf
*conf
, sector_t r_sector
,
2580 int previous
, int *dd_idx
,
2581 struct stripe_head
*sh
)
2583 sector_t stripe
, stripe2
;
2584 sector_t chunk_number
;
2585 unsigned int chunk_offset
;
2588 sector_t new_sector
;
2589 int algorithm
= previous
? conf
->prev_algo
2591 int sectors_per_chunk
= previous
? conf
->prev_chunk_sectors
2592 : conf
->chunk_sectors
;
2593 int raid_disks
= previous
? conf
->previous_raid_disks
2595 int data_disks
= raid_disks
- conf
->max_degraded
;
2597 /* First compute the information on this sector */
2600 * Compute the chunk number and the sector offset inside the chunk
2602 chunk_offset
= sector_div(r_sector
, sectors_per_chunk
);
2603 chunk_number
= r_sector
;
2606 * Compute the stripe number
2608 stripe
= chunk_number
;
2609 *dd_idx
= sector_div(stripe
, data_disks
);
2612 * Select the parity disk based on the user selected algorithm.
2614 pd_idx
= qd_idx
= -1;
2615 switch(conf
->level
) {
2617 pd_idx
= data_disks
;
2620 switch (algorithm
) {
2621 case ALGORITHM_LEFT_ASYMMETRIC
:
2622 pd_idx
= data_disks
- sector_div(stripe2
, raid_disks
);
2623 if (*dd_idx
>= pd_idx
)
2626 case ALGORITHM_RIGHT_ASYMMETRIC
:
2627 pd_idx
= sector_div(stripe2
, raid_disks
);
2628 if (*dd_idx
>= pd_idx
)
2631 case ALGORITHM_LEFT_SYMMETRIC
:
2632 pd_idx
= data_disks
- sector_div(stripe2
, raid_disks
);
2633 *dd_idx
= (pd_idx
+ 1 + *dd_idx
) % raid_disks
;
2635 case ALGORITHM_RIGHT_SYMMETRIC
:
2636 pd_idx
= sector_div(stripe2
, raid_disks
);
2637 *dd_idx
= (pd_idx
+ 1 + *dd_idx
) % raid_disks
;
2639 case ALGORITHM_PARITY_0
:
2643 case ALGORITHM_PARITY_N
:
2644 pd_idx
= data_disks
;
2652 switch (algorithm
) {
2653 case ALGORITHM_LEFT_ASYMMETRIC
:
2654 pd_idx
= raid_disks
- 1 - sector_div(stripe2
, raid_disks
);
2655 qd_idx
= pd_idx
+ 1;
2656 if (pd_idx
== raid_disks
-1) {
2657 (*dd_idx
)++; /* Q D D D P */
2659 } else if (*dd_idx
>= pd_idx
)
2660 (*dd_idx
) += 2; /* D D P Q D */
2662 case ALGORITHM_RIGHT_ASYMMETRIC
:
2663 pd_idx
= sector_div(stripe2
, raid_disks
);
2664 qd_idx
= pd_idx
+ 1;
2665 if (pd_idx
== raid_disks
-1) {
2666 (*dd_idx
)++; /* Q D D D P */
2668 } else if (*dd_idx
>= pd_idx
)
2669 (*dd_idx
) += 2; /* D D P Q D */
2671 case ALGORITHM_LEFT_SYMMETRIC
:
2672 pd_idx
= raid_disks
- 1 - sector_div(stripe2
, raid_disks
);
2673 qd_idx
= (pd_idx
+ 1) % raid_disks
;
2674 *dd_idx
= (pd_idx
+ 2 + *dd_idx
) % raid_disks
;
2676 case ALGORITHM_RIGHT_SYMMETRIC
:
2677 pd_idx
= sector_div(stripe2
, raid_disks
);
2678 qd_idx
= (pd_idx
+ 1) % raid_disks
;
2679 *dd_idx
= (pd_idx
+ 2 + *dd_idx
) % raid_disks
;
2682 case ALGORITHM_PARITY_0
:
2687 case ALGORITHM_PARITY_N
:
2688 pd_idx
= data_disks
;
2689 qd_idx
= data_disks
+ 1;
2692 case ALGORITHM_ROTATING_ZERO_RESTART
:
2693 /* Exactly the same as RIGHT_ASYMMETRIC, but or
2694 * of blocks for computing Q is different.
2696 pd_idx
= sector_div(stripe2
, raid_disks
);
2697 qd_idx
= pd_idx
+ 1;
2698 if (pd_idx
== raid_disks
-1) {
2699 (*dd_idx
)++; /* Q D D D P */
2701 } else if (*dd_idx
>= pd_idx
)
2702 (*dd_idx
) += 2; /* D D P Q D */
2706 case ALGORITHM_ROTATING_N_RESTART
:
2707 /* Same a left_asymmetric, by first stripe is
2708 * D D D P Q rather than
2712 pd_idx
= raid_disks
- 1 - sector_div(stripe2
, raid_disks
);
2713 qd_idx
= pd_idx
+ 1;
2714 if (pd_idx
== raid_disks
-1) {
2715 (*dd_idx
)++; /* Q D D D P */
2717 } else if (*dd_idx
>= pd_idx
)
2718 (*dd_idx
) += 2; /* D D P Q D */
2722 case ALGORITHM_ROTATING_N_CONTINUE
:
2723 /* Same as left_symmetric but Q is before P */
2724 pd_idx
= raid_disks
- 1 - sector_div(stripe2
, raid_disks
);
2725 qd_idx
= (pd_idx
+ raid_disks
- 1) % raid_disks
;
2726 *dd_idx
= (pd_idx
+ 1 + *dd_idx
) % raid_disks
;
2730 case ALGORITHM_LEFT_ASYMMETRIC_6
:
2731 /* RAID5 left_asymmetric, with Q on last device */
2732 pd_idx
= data_disks
- sector_div(stripe2
, raid_disks
-1);
2733 if (*dd_idx
>= pd_idx
)
2735 qd_idx
= raid_disks
- 1;
2738 case ALGORITHM_RIGHT_ASYMMETRIC_6
:
2739 pd_idx
= sector_div(stripe2
, raid_disks
-1);
2740 if (*dd_idx
>= pd_idx
)
2742 qd_idx
= raid_disks
- 1;
2745 case ALGORITHM_LEFT_SYMMETRIC_6
:
2746 pd_idx
= data_disks
- sector_div(stripe2
, raid_disks
-1);
2747 *dd_idx
= (pd_idx
+ 1 + *dd_idx
) % (raid_disks
-1);
2748 qd_idx
= raid_disks
- 1;
2751 case ALGORITHM_RIGHT_SYMMETRIC_6
:
2752 pd_idx
= sector_div(stripe2
, raid_disks
-1);
2753 *dd_idx
= (pd_idx
+ 1 + *dd_idx
) % (raid_disks
-1);
2754 qd_idx
= raid_disks
- 1;
2757 case ALGORITHM_PARITY_0_6
:
2760 qd_idx
= raid_disks
- 1;
2770 sh
->pd_idx
= pd_idx
;
2771 sh
->qd_idx
= qd_idx
;
2772 sh
->ddf_layout
= ddf_layout
;
2775 * Finally, compute the new sector number
2777 new_sector
= (sector_t
)stripe
* sectors_per_chunk
+ chunk_offset
;
2781 sector_t
raid5_compute_blocknr(struct stripe_head
*sh
, int i
, int previous
)
2783 struct r5conf
*conf
= sh
->raid_conf
;
2784 int raid_disks
= sh
->disks
;
2785 int data_disks
= raid_disks
- conf
->max_degraded
;
2786 sector_t new_sector
= sh
->sector
, check
;
2787 int sectors_per_chunk
= previous
? conf
->prev_chunk_sectors
2788 : conf
->chunk_sectors
;
2789 int algorithm
= previous
? conf
->prev_algo
2793 sector_t chunk_number
;
2794 int dummy1
, dd_idx
= i
;
2796 struct stripe_head sh2
;
2798 chunk_offset
= sector_div(new_sector
, sectors_per_chunk
);
2799 stripe
= new_sector
;
2801 if (i
== sh
->pd_idx
)
2803 switch(conf
->level
) {
2806 switch (algorithm
) {
2807 case ALGORITHM_LEFT_ASYMMETRIC
:
2808 case ALGORITHM_RIGHT_ASYMMETRIC
:
2812 case ALGORITHM_LEFT_SYMMETRIC
:
2813 case ALGORITHM_RIGHT_SYMMETRIC
:
2816 i
-= (sh
->pd_idx
+ 1);
2818 case ALGORITHM_PARITY_0
:
2821 case ALGORITHM_PARITY_N
:
2828 if (i
== sh
->qd_idx
)
2829 return 0; /* It is the Q disk */
2830 switch (algorithm
) {
2831 case ALGORITHM_LEFT_ASYMMETRIC
:
2832 case ALGORITHM_RIGHT_ASYMMETRIC
:
2833 case ALGORITHM_ROTATING_ZERO_RESTART
:
2834 case ALGORITHM_ROTATING_N_RESTART
:
2835 if (sh
->pd_idx
== raid_disks
-1)
2836 i
--; /* Q D D D P */
2837 else if (i
> sh
->pd_idx
)
2838 i
-= 2; /* D D P Q D */
2840 case ALGORITHM_LEFT_SYMMETRIC
:
2841 case ALGORITHM_RIGHT_SYMMETRIC
:
2842 if (sh
->pd_idx
== raid_disks
-1)
2843 i
--; /* Q D D D P */
2848 i
-= (sh
->pd_idx
+ 2);
2851 case ALGORITHM_PARITY_0
:
2854 case ALGORITHM_PARITY_N
:
2856 case ALGORITHM_ROTATING_N_CONTINUE
:
2857 /* Like left_symmetric, but P is before Q */
2858 if (sh
->pd_idx
== 0)
2859 i
--; /* P D D D Q */
2864 i
-= (sh
->pd_idx
+ 1);
2867 case ALGORITHM_LEFT_ASYMMETRIC_6
:
2868 case ALGORITHM_RIGHT_ASYMMETRIC_6
:
2872 case ALGORITHM_LEFT_SYMMETRIC_6
:
2873 case ALGORITHM_RIGHT_SYMMETRIC_6
:
2875 i
+= data_disks
+ 1;
2876 i
-= (sh
->pd_idx
+ 1);
2878 case ALGORITHM_PARITY_0_6
:
2887 chunk_number
= stripe
* data_disks
+ i
;
2888 r_sector
= chunk_number
* sectors_per_chunk
+ chunk_offset
;
2890 check
= raid5_compute_sector(conf
, r_sector
,
2891 previous
, &dummy1
, &sh2
);
2892 if (check
!= sh
->sector
|| dummy1
!= dd_idx
|| sh2
.pd_idx
!= sh
->pd_idx
2893 || sh2
.qd_idx
!= sh
->qd_idx
) {
2894 pr_warn("md/raid:%s: compute_blocknr: map not correct\n",
2895 mdname(conf
->mddev
));
2902 * There are cases where we want handle_stripe_dirtying() and
2903 * schedule_reconstruction() to delay towrite to some dev of a stripe.
2905 * This function checks whether we want to delay the towrite. Specifically,
2906 * we delay the towrite when:
2908 * 1. degraded stripe has a non-overwrite to the missing dev, AND this
2909 * stripe has data in journal (for other devices).
2911 * In this case, when reading data for the non-overwrite dev, it is
2912 * necessary to handle complex rmw of write back cache (prexor with
2913 * orig_page, and xor with page). To keep read path simple, we would
2914 * like to flush data in journal to RAID disks first, so complex rmw
2915 * is handled in the write patch (handle_stripe_dirtying).
2918 static inline bool delay_towrite(struct r5dev
*dev
,
2919 struct stripe_head_state
*s
)
2921 return !test_bit(R5_OVERWRITE
, &dev
->flags
) &&
2922 !test_bit(R5_Insync
, &dev
->flags
) && s
->injournal
;
2926 schedule_reconstruction(struct stripe_head
*sh
, struct stripe_head_state
*s
,
2927 int rcw
, int expand
)
2929 int i
, pd_idx
= sh
->pd_idx
, qd_idx
= sh
->qd_idx
, disks
= sh
->disks
;
2930 struct r5conf
*conf
= sh
->raid_conf
;
2931 int level
= conf
->level
;
2935 * In some cases, handle_stripe_dirtying initially decided to
2936 * run rmw and allocates extra page for prexor. However, rcw is
2937 * cheaper later on. We need to free the extra page now,
2938 * because we won't be able to do that in ops_complete_prexor().
2940 r5c_release_extra_page(sh
);
2942 for (i
= disks
; i
--; ) {
2943 struct r5dev
*dev
= &sh
->dev
[i
];
2945 if (dev
->towrite
&& !delay_towrite(dev
, s
)) {
2946 set_bit(R5_LOCKED
, &dev
->flags
);
2947 set_bit(R5_Wantdrain
, &dev
->flags
);
2949 clear_bit(R5_UPTODATE
, &dev
->flags
);
2951 } else if (test_bit(R5_InJournal
, &dev
->flags
)) {
2952 set_bit(R5_LOCKED
, &dev
->flags
);
2956 /* if we are not expanding this is a proper write request, and
2957 * there will be bios with new data to be drained into the
2962 /* False alarm, nothing to do */
2964 sh
->reconstruct_state
= reconstruct_state_drain_run
;
2965 set_bit(STRIPE_OP_BIODRAIN
, &s
->ops_request
);
2967 sh
->reconstruct_state
= reconstruct_state_run
;
2969 set_bit(STRIPE_OP_RECONSTRUCT
, &s
->ops_request
);
2971 if (s
->locked
+ conf
->max_degraded
== disks
)
2972 if (!test_and_set_bit(STRIPE_FULL_WRITE
, &sh
->state
))
2973 atomic_inc(&conf
->pending_full_writes
);
2975 BUG_ON(!(test_bit(R5_UPTODATE
, &sh
->dev
[pd_idx
].flags
) ||
2976 test_bit(R5_Wantcompute
, &sh
->dev
[pd_idx
].flags
)));
2977 BUG_ON(level
== 6 &&
2978 (!(test_bit(R5_UPTODATE
, &sh
->dev
[qd_idx
].flags
) ||
2979 test_bit(R5_Wantcompute
, &sh
->dev
[qd_idx
].flags
))));
2981 for (i
= disks
; i
--; ) {
2982 struct r5dev
*dev
= &sh
->dev
[i
];
2983 if (i
== pd_idx
|| i
== qd_idx
)
2987 (test_bit(R5_UPTODATE
, &dev
->flags
) ||
2988 test_bit(R5_Wantcompute
, &dev
->flags
))) {
2989 set_bit(R5_Wantdrain
, &dev
->flags
);
2990 set_bit(R5_LOCKED
, &dev
->flags
);
2991 clear_bit(R5_UPTODATE
, &dev
->flags
);
2993 } else if (test_bit(R5_InJournal
, &dev
->flags
)) {
2994 set_bit(R5_LOCKED
, &dev
->flags
);
2999 /* False alarm - nothing to do */
3001 sh
->reconstruct_state
= reconstruct_state_prexor_drain_run
;
3002 set_bit(STRIPE_OP_PREXOR
, &s
->ops_request
);
3003 set_bit(STRIPE_OP_BIODRAIN
, &s
->ops_request
);
3004 set_bit(STRIPE_OP_RECONSTRUCT
, &s
->ops_request
);
3007 /* keep the parity disk(s) locked while asynchronous operations
3010 set_bit(R5_LOCKED
, &sh
->dev
[pd_idx
].flags
);
3011 clear_bit(R5_UPTODATE
, &sh
->dev
[pd_idx
].flags
);
3015 int qd_idx
= sh
->qd_idx
;
3016 struct r5dev
*dev
= &sh
->dev
[qd_idx
];
3018 set_bit(R5_LOCKED
, &dev
->flags
);
3019 clear_bit(R5_UPTODATE
, &dev
->flags
);
3023 pr_debug("%s: stripe %llu locked: %d ops_request: %lx\n",
3024 __func__
, (unsigned long long)sh
->sector
,
3025 s
->locked
, s
->ops_request
);
3029 * Each stripe/dev can have one or more bion attached.
3030 * toread/towrite point to the first in a chain.
3031 * The bi_next chain must be in order.
3033 static int add_stripe_bio(struct stripe_head
*sh
, struct bio
*bi
, int dd_idx
,
3034 int forwrite
, int previous
)
3037 struct r5conf
*conf
= sh
->raid_conf
;
3040 pr_debug("adding bi b#%llu to stripe s#%llu\n",
3041 (unsigned long long)bi
->bi_iter
.bi_sector
,
3042 (unsigned long long)sh
->sector
);
3045 * If several bio share a stripe. The bio bi_phys_segments acts as a
3046 * reference count to avoid race. The reference count should already be
3047 * increased before this function is called (for example, in
3048 * raid5_make_request()), so other bio sharing this stripe will not free the
3049 * stripe. If a stripe is owned by one stripe, the stripe lock will
3052 spin_lock_irq(&sh
->stripe_lock
);
3053 /* Don't allow new IO added to stripes in batch list */
3057 bip
= &sh
->dev
[dd_idx
].towrite
;
3061 bip
= &sh
->dev
[dd_idx
].toread
;
3062 while (*bip
&& (*bip
)->bi_iter
.bi_sector
< bi
->bi_iter
.bi_sector
) {
3063 if (bio_end_sector(*bip
) > bi
->bi_iter
.bi_sector
)
3065 bip
= & (*bip
)->bi_next
;
3067 if (*bip
&& (*bip
)->bi_iter
.bi_sector
< bio_end_sector(bi
))
3070 if (!forwrite
|| previous
)
3071 clear_bit(STRIPE_BATCH_READY
, &sh
->state
);
3073 BUG_ON(*bip
&& bi
->bi_next
&& (*bip
) != bi
->bi_next
);
3077 raid5_inc_bi_active_stripes(bi
);
3080 /* check if page is covered */
3081 sector_t sector
= sh
->dev
[dd_idx
].sector
;
3082 for (bi
=sh
->dev
[dd_idx
].towrite
;
3083 sector
< sh
->dev
[dd_idx
].sector
+ STRIPE_SECTORS
&&
3084 bi
&& bi
->bi_iter
.bi_sector
<= sector
;
3085 bi
= r5_next_bio(bi
, sh
->dev
[dd_idx
].sector
)) {
3086 if (bio_end_sector(bi
) >= sector
)
3087 sector
= bio_end_sector(bi
);
3089 if (sector
>= sh
->dev
[dd_idx
].sector
+ STRIPE_SECTORS
)
3090 if (!test_and_set_bit(R5_OVERWRITE
, &sh
->dev
[dd_idx
].flags
))
3091 sh
->overwrite_disks
++;
3094 pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n",
3095 (unsigned long long)(*bip
)->bi_iter
.bi_sector
,
3096 (unsigned long long)sh
->sector
, dd_idx
);
3098 if (conf
->mddev
->bitmap
&& firstwrite
) {
3099 /* Cannot hold spinlock over bitmap_startwrite,
3100 * but must ensure this isn't added to a batch until
3101 * we have added to the bitmap and set bm_seq.
3102 * So set STRIPE_BITMAP_PENDING to prevent
3104 * If multiple add_stripe_bio() calls race here they
3105 * much all set STRIPE_BITMAP_PENDING. So only the first one
3106 * to complete "bitmap_startwrite" gets to set
3107 * STRIPE_BIT_DELAY. This is important as once a stripe
3108 * is added to a batch, STRIPE_BIT_DELAY cannot be changed
3111 set_bit(STRIPE_BITMAP_PENDING
, &sh
->state
);
3112 spin_unlock_irq(&sh
->stripe_lock
);
3113 bitmap_startwrite(conf
->mddev
->bitmap
, sh
->sector
,
3115 spin_lock_irq(&sh
->stripe_lock
);
3116 clear_bit(STRIPE_BITMAP_PENDING
, &sh
->state
);
3117 if (!sh
->batch_head
) {
3118 sh
->bm_seq
= conf
->seq_flush
+1;
3119 set_bit(STRIPE_BIT_DELAY
, &sh
->state
);
3122 spin_unlock_irq(&sh
->stripe_lock
);
3124 if (stripe_can_batch(sh
))
3125 stripe_add_to_batch_list(conf
, sh
);
3129 set_bit(R5_Overlap
, &sh
->dev
[dd_idx
].flags
);
3130 spin_unlock_irq(&sh
->stripe_lock
);
3134 static void end_reshape(struct r5conf
*conf
);
3136 static void stripe_set_idx(sector_t stripe
, struct r5conf
*conf
, int previous
,
3137 struct stripe_head
*sh
)
3139 int sectors_per_chunk
=
3140 previous
? conf
->prev_chunk_sectors
: conf
->chunk_sectors
;
3142 int chunk_offset
= sector_div(stripe
, sectors_per_chunk
);
3143 int disks
= previous
? conf
->previous_raid_disks
: conf
->raid_disks
;
3145 raid5_compute_sector(conf
,
3146 stripe
* (disks
- conf
->max_degraded
)
3147 *sectors_per_chunk
+ chunk_offset
,
3153 handle_failed_stripe(struct r5conf
*conf
, struct stripe_head
*sh
,
3154 struct stripe_head_state
*s
, int disks
,
3155 struct bio_list
*return_bi
)
3158 BUG_ON(sh
->batch_head
);
3159 for (i
= disks
; i
--; ) {
3163 if (test_bit(R5_ReadError
, &sh
->dev
[i
].flags
)) {
3164 struct md_rdev
*rdev
;
3166 rdev
= rcu_dereference(conf
->disks
[i
].rdev
);
3167 if (rdev
&& test_bit(In_sync
, &rdev
->flags
) &&
3168 !test_bit(Faulty
, &rdev
->flags
))
3169 atomic_inc(&rdev
->nr_pending
);
3174 if (!rdev_set_badblocks(
3178 md_error(conf
->mddev
, rdev
);
3179 rdev_dec_pending(rdev
, conf
->mddev
);
3182 spin_lock_irq(&sh
->stripe_lock
);
3183 /* fail all writes first */
3184 bi
= sh
->dev
[i
].towrite
;
3185 sh
->dev
[i
].towrite
= NULL
;
3186 sh
->overwrite_disks
= 0;
3187 spin_unlock_irq(&sh
->stripe_lock
);
3191 r5l_stripe_write_finished(sh
);
3193 if (test_and_clear_bit(R5_Overlap
, &sh
->dev
[i
].flags
))
3194 wake_up(&conf
->wait_for_overlap
);
3196 while (bi
&& bi
->bi_iter
.bi_sector
<
3197 sh
->dev
[i
].sector
+ STRIPE_SECTORS
) {
3198 struct bio
*nextbi
= r5_next_bio(bi
, sh
->dev
[i
].sector
);
3200 bi
->bi_error
= -EIO
;
3201 if (!raid5_dec_bi_active_stripes(bi
)) {
3202 md_write_end(conf
->mddev
);
3203 bio_list_add(return_bi
, bi
);
3208 bitmap_endwrite(conf
->mddev
->bitmap
, sh
->sector
,
3209 STRIPE_SECTORS
, 0, 0);
3211 /* and fail all 'written' */
3212 bi
= sh
->dev
[i
].written
;
3213 sh
->dev
[i
].written
= NULL
;
3214 if (test_and_clear_bit(R5_SkipCopy
, &sh
->dev
[i
].flags
)) {
3215 WARN_ON(test_bit(R5_UPTODATE
, &sh
->dev
[i
].flags
));
3216 sh
->dev
[i
].page
= sh
->dev
[i
].orig_page
;
3219 if (bi
) bitmap_end
= 1;
3220 while (bi
&& bi
->bi_iter
.bi_sector
<
3221 sh
->dev
[i
].sector
+ STRIPE_SECTORS
) {
3222 struct bio
*bi2
= r5_next_bio(bi
, sh
->dev
[i
].sector
);
3224 bi
->bi_error
= -EIO
;
3225 if (!raid5_dec_bi_active_stripes(bi
)) {
3226 md_write_end(conf
->mddev
);
3227 bio_list_add(return_bi
, bi
);
3232 /* fail any reads if this device is non-operational and
3233 * the data has not reached the cache yet.
3235 if (!test_bit(R5_Wantfill
, &sh
->dev
[i
].flags
) &&
3236 s
->failed
> conf
->max_degraded
&&
3237 (!test_bit(R5_Insync
, &sh
->dev
[i
].flags
) ||
3238 test_bit(R5_ReadError
, &sh
->dev
[i
].flags
))) {
3239 spin_lock_irq(&sh
->stripe_lock
);
3240 bi
= sh
->dev
[i
].toread
;
3241 sh
->dev
[i
].toread
= NULL
;
3242 spin_unlock_irq(&sh
->stripe_lock
);
3243 if (test_and_clear_bit(R5_Overlap
, &sh
->dev
[i
].flags
))
3244 wake_up(&conf
->wait_for_overlap
);
3247 while (bi
&& bi
->bi_iter
.bi_sector
<
3248 sh
->dev
[i
].sector
+ STRIPE_SECTORS
) {
3249 struct bio
*nextbi
=
3250 r5_next_bio(bi
, sh
->dev
[i
].sector
);
3252 bi
->bi_error
= -EIO
;
3253 if (!raid5_dec_bi_active_stripes(bi
))
3254 bio_list_add(return_bi
, bi
);
3259 bitmap_endwrite(conf
->mddev
->bitmap
, sh
->sector
,
3260 STRIPE_SECTORS
, 0, 0);
3261 /* If we were in the middle of a write the parity block might
3262 * still be locked - so just clear all R5_LOCKED flags
3264 clear_bit(R5_LOCKED
, &sh
->dev
[i
].flags
);
3269 if (test_and_clear_bit(STRIPE_FULL_WRITE
, &sh
->state
))
3270 if (atomic_dec_and_test(&conf
->pending_full_writes
))
3271 md_wakeup_thread(conf
->mddev
->thread
);
3275 handle_failed_sync(struct r5conf
*conf
, struct stripe_head
*sh
,
3276 struct stripe_head_state
*s
)
3281 BUG_ON(sh
->batch_head
);
3282 clear_bit(STRIPE_SYNCING
, &sh
->state
);
3283 if (test_and_clear_bit(R5_Overlap
, &sh
->dev
[sh
->pd_idx
].flags
))
3284 wake_up(&conf
->wait_for_overlap
);
3287 /* There is nothing more to do for sync/check/repair.
3288 * Don't even need to abort as that is handled elsewhere
3289 * if needed, and not always wanted e.g. if there is a known
3291 * For recover/replace we need to record a bad block on all
3292 * non-sync devices, or abort the recovery
3294 if (test_bit(MD_RECOVERY_RECOVER
, &conf
->mddev
->recovery
)) {
3295 /* During recovery devices cannot be removed, so
3296 * locking and refcounting of rdevs is not needed
3299 for (i
= 0; i
< conf
->raid_disks
; i
++) {
3300 struct md_rdev
*rdev
= rcu_dereference(conf
->disks
[i
].rdev
);
3302 && !test_bit(Faulty
, &rdev
->flags
)
3303 && !test_bit(In_sync
, &rdev
->flags
)
3304 && !rdev_set_badblocks(rdev
, sh
->sector
,
3307 rdev
= rcu_dereference(conf
->disks
[i
].replacement
);
3309 && !test_bit(Faulty
, &rdev
->flags
)
3310 && !test_bit(In_sync
, &rdev
->flags
)
3311 && !rdev_set_badblocks(rdev
, sh
->sector
,
3317 conf
->recovery_disabled
=
3318 conf
->mddev
->recovery_disabled
;
3320 md_done_sync(conf
->mddev
, STRIPE_SECTORS
, !abort
);
3323 static int want_replace(struct stripe_head
*sh
, int disk_idx
)
3325 struct md_rdev
*rdev
;
3329 rdev
= rcu_dereference(sh
->raid_conf
->disks
[disk_idx
].replacement
);
3331 && !test_bit(Faulty
, &rdev
->flags
)
3332 && !test_bit(In_sync
, &rdev
->flags
)
3333 && (rdev
->recovery_offset
<= sh
->sector
3334 || rdev
->mddev
->recovery_cp
<= sh
->sector
))
3340 static int need_this_block(struct stripe_head
*sh
, struct stripe_head_state
*s
,
3341 int disk_idx
, int disks
)
3343 struct r5dev
*dev
= &sh
->dev
[disk_idx
];
3344 struct r5dev
*fdev
[2] = { &sh
->dev
[s
->failed_num
[0]],
3345 &sh
->dev
[s
->failed_num
[1]] };
3349 if (test_bit(R5_LOCKED
, &dev
->flags
) ||
3350 test_bit(R5_UPTODATE
, &dev
->flags
))
3351 /* No point reading this as we already have it or have
3352 * decided to get it.
3357 (dev
->towrite
&& !test_bit(R5_OVERWRITE
, &dev
->flags
)))
3358 /* We need this block to directly satisfy a request */
3361 if (s
->syncing
|| s
->expanding
||
3362 (s
->replacing
&& want_replace(sh
, disk_idx
)))
3363 /* When syncing, or expanding we read everything.
3364 * When replacing, we need the replaced block.
3368 if ((s
->failed
>= 1 && fdev
[0]->toread
) ||
3369 (s
->failed
>= 2 && fdev
[1]->toread
))
3370 /* If we want to read from a failed device, then
3371 * we need to actually read every other device.
3375 /* Sometimes neither read-modify-write nor reconstruct-write
3376 * cycles can work. In those cases we read every block we
3377 * can. Then the parity-update is certain to have enough to
3379 * This can only be a problem when we need to write something,
3380 * and some device has failed. If either of those tests
3381 * fail we need look no further.
3383 if (!s
->failed
|| !s
->to_write
)
3386 if (test_bit(R5_Insync
, &dev
->flags
) &&
3387 !test_bit(STRIPE_PREREAD_ACTIVE
, &sh
->state
))
3388 /* Pre-reads at not permitted until after short delay
3389 * to gather multiple requests. However if this
3390 * device is no Insync, the block could only be be computed
3391 * and there is no need to delay that.
3395 for (i
= 0; i
< s
->failed
&& i
< 2; i
++) {
3396 if (fdev
[i
]->towrite
&&
3397 !test_bit(R5_UPTODATE
, &fdev
[i
]->flags
) &&
3398 !test_bit(R5_OVERWRITE
, &fdev
[i
]->flags
))
3399 /* If we have a partial write to a failed
3400 * device, then we will need to reconstruct
3401 * the content of that device, so all other
3402 * devices must be read.
3407 /* If we are forced to do a reconstruct-write, either because
3408 * the current RAID6 implementation only supports that, or
3409 * or because parity cannot be trusted and we are currently
3410 * recovering it, there is extra need to be careful.
3411 * If one of the devices that we would need to read, because
3412 * it is not being overwritten (and maybe not written at all)
3413 * is missing/faulty, then we need to read everything we can.
3415 if (sh
->raid_conf
->level
!= 6 &&
3416 sh
->sector
< sh
->raid_conf
->mddev
->recovery_cp
)
3417 /* reconstruct-write isn't being forced */
3419 for (i
= 0; i
< s
->failed
&& i
< 2; i
++) {
3420 if (s
->failed_num
[i
] != sh
->pd_idx
&&
3421 s
->failed_num
[i
] != sh
->qd_idx
&&
3422 !test_bit(R5_UPTODATE
, &fdev
[i
]->flags
) &&
3423 !test_bit(R5_OVERWRITE
, &fdev
[i
]->flags
))
3430 /* fetch_block - checks the given member device to see if its data needs
3431 * to be read or computed to satisfy a request.
3433 * Returns 1 when no more member devices need to be checked, otherwise returns
3434 * 0 to tell the loop in handle_stripe_fill to continue
3436 static int fetch_block(struct stripe_head
*sh
, struct stripe_head_state
*s
,
3437 int disk_idx
, int disks
)
3439 struct r5dev
*dev
= &sh
->dev
[disk_idx
];
3441 /* is the data in this block needed, and can we get it? */
3442 if (need_this_block(sh
, s
, disk_idx
, disks
)) {
3443 /* we would like to get this block, possibly by computing it,
3444 * otherwise read it if the backing disk is insync
3446 BUG_ON(test_bit(R5_Wantcompute
, &dev
->flags
));
3447 BUG_ON(test_bit(R5_Wantread
, &dev
->flags
));
3448 BUG_ON(sh
->batch_head
);
3449 if ((s
->uptodate
== disks
- 1) &&
3450 (s
->failed
&& (disk_idx
== s
->failed_num
[0] ||
3451 disk_idx
== s
->failed_num
[1]))) {
3452 /* have disk failed, and we're requested to fetch it;
3455 pr_debug("Computing stripe %llu block %d\n",
3456 (unsigned long long)sh
->sector
, disk_idx
);
3457 set_bit(STRIPE_COMPUTE_RUN
, &sh
->state
);
3458 set_bit(STRIPE_OP_COMPUTE_BLK
, &s
->ops_request
);
3459 set_bit(R5_Wantcompute
, &dev
->flags
);
3460 sh
->ops
.target
= disk_idx
;
3461 sh
->ops
.target2
= -1; /* no 2nd target */
3463 /* Careful: from this point on 'uptodate' is in the eye
3464 * of raid_run_ops which services 'compute' operations
3465 * before writes. R5_Wantcompute flags a block that will
3466 * be R5_UPTODATE by the time it is needed for a
3467 * subsequent operation.
3471 } else if (s
->uptodate
== disks
-2 && s
->failed
>= 2) {
3472 /* Computing 2-failure is *very* expensive; only
3473 * do it if failed >= 2
3476 for (other
= disks
; other
--; ) {
3477 if (other
== disk_idx
)
3479 if (!test_bit(R5_UPTODATE
,
3480 &sh
->dev
[other
].flags
))
3484 pr_debug("Computing stripe %llu blocks %d,%d\n",
3485 (unsigned long long)sh
->sector
,
3487 set_bit(STRIPE_COMPUTE_RUN
, &sh
->state
);
3488 set_bit(STRIPE_OP_COMPUTE_BLK
, &s
->ops_request
);
3489 set_bit(R5_Wantcompute
, &sh
->dev
[disk_idx
].flags
);
3490 set_bit(R5_Wantcompute
, &sh
->dev
[other
].flags
);
3491 sh
->ops
.target
= disk_idx
;
3492 sh
->ops
.target2
= other
;
3496 } else if (test_bit(R5_Insync
, &dev
->flags
)) {
3497 set_bit(R5_LOCKED
, &dev
->flags
);
3498 set_bit(R5_Wantread
, &dev
->flags
);
3500 pr_debug("Reading block %d (sync=%d)\n",
3501 disk_idx
, s
->syncing
);
3509 * handle_stripe_fill - read or compute data to satisfy pending requests.
3511 static void handle_stripe_fill(struct stripe_head
*sh
,
3512 struct stripe_head_state
*s
,
3517 /* look for blocks to read/compute, skip this if a compute
3518 * is already in flight, or if the stripe contents are in the
3519 * midst of changing due to a write
3521 if (!test_bit(STRIPE_COMPUTE_RUN
, &sh
->state
) && !sh
->check_state
&&
3522 !sh
->reconstruct_state
) {
3525 * For degraded stripe with data in journal, do not handle
3526 * read requests yet, instead, flush the stripe to raid
3527 * disks first, this avoids handling complex rmw of write
3528 * back cache (prexor with orig_page, and then xor with
3529 * page) in the read path
3531 if (s
->injournal
&& s
->failed
) {
3532 if (test_bit(STRIPE_R5C_CACHING
, &sh
->state
))
3533 r5c_make_stripe_write_out(sh
);
3537 for (i
= disks
; i
--; )
3538 if (fetch_block(sh
, s
, i
, disks
))
3542 set_bit(STRIPE_HANDLE
, &sh
->state
);
3545 static void break_stripe_batch_list(struct stripe_head
*head_sh
,
3546 unsigned long handle_flags
);
3547 /* handle_stripe_clean_event
3548 * any written block on an uptodate or failed drive can be returned.
3549 * Note that if we 'wrote' to a failed drive, it will be UPTODATE, but
3550 * never LOCKED, so we don't need to test 'failed' directly.
3552 static void handle_stripe_clean_event(struct r5conf
*conf
,
3553 struct stripe_head
*sh
, int disks
, struct bio_list
*return_bi
)
3557 int discard_pending
= 0;
3558 struct stripe_head
*head_sh
= sh
;
3559 bool do_endio
= false;
3561 for (i
= disks
; i
--; )
3562 if (sh
->dev
[i
].written
) {
3564 if (!test_bit(R5_LOCKED
, &dev
->flags
) &&
3565 (test_bit(R5_UPTODATE
, &dev
->flags
) ||
3566 test_bit(R5_Discard
, &dev
->flags
) ||
3567 test_bit(R5_SkipCopy
, &dev
->flags
))) {
3568 /* We can return any write requests */
3569 struct bio
*wbi
, *wbi2
;
3570 pr_debug("Return write for disc %d\n", i
);
3571 if (test_and_clear_bit(R5_Discard
, &dev
->flags
))
3572 clear_bit(R5_UPTODATE
, &dev
->flags
);
3573 if (test_and_clear_bit(R5_SkipCopy
, &dev
->flags
)) {
3574 WARN_ON(test_bit(R5_UPTODATE
, &dev
->flags
));
3579 dev
->page
= dev
->orig_page
;
3581 dev
->written
= NULL
;
3582 while (wbi
&& wbi
->bi_iter
.bi_sector
<
3583 dev
->sector
+ STRIPE_SECTORS
) {
3584 wbi2
= r5_next_bio(wbi
, dev
->sector
);
3585 if (!raid5_dec_bi_active_stripes(wbi
)) {
3586 md_write_end(conf
->mddev
);
3587 bio_list_add(return_bi
, wbi
);
3591 bitmap_endwrite(conf
->mddev
->bitmap
, sh
->sector
,
3593 !test_bit(STRIPE_DEGRADED
, &sh
->state
),
3595 if (head_sh
->batch_head
) {
3596 sh
= list_first_entry(&sh
->batch_list
,
3599 if (sh
!= head_sh
) {
3606 } else if (test_bit(R5_Discard
, &dev
->flags
))
3607 discard_pending
= 1;
3610 r5l_stripe_write_finished(sh
);
3612 if (!discard_pending
&&
3613 test_bit(R5_Discard
, &sh
->dev
[sh
->pd_idx
].flags
)) {
3615 clear_bit(R5_Discard
, &sh
->dev
[sh
->pd_idx
].flags
);
3616 clear_bit(R5_UPTODATE
, &sh
->dev
[sh
->pd_idx
].flags
);
3617 if (sh
->qd_idx
>= 0) {
3618 clear_bit(R5_Discard
, &sh
->dev
[sh
->qd_idx
].flags
);
3619 clear_bit(R5_UPTODATE
, &sh
->dev
[sh
->qd_idx
].flags
);
3621 /* now that discard is done we can proceed with any sync */
3622 clear_bit(STRIPE_DISCARD
, &sh
->state
);
3624 * SCSI discard will change some bio fields and the stripe has
3625 * no updated data, so remove it from hash list and the stripe
3626 * will be reinitialized
3629 hash
= sh
->hash_lock_index
;
3630 spin_lock_irq(conf
->hash_locks
+ hash
);
3632 spin_unlock_irq(conf
->hash_locks
+ hash
);
3633 if (head_sh
->batch_head
) {
3634 sh
= list_first_entry(&sh
->batch_list
,
3635 struct stripe_head
, batch_list
);
3641 if (test_bit(STRIPE_SYNC_REQUESTED
, &sh
->state
))
3642 set_bit(STRIPE_HANDLE
, &sh
->state
);
3646 if (test_and_clear_bit(STRIPE_FULL_WRITE
, &sh
->state
))
3647 if (atomic_dec_and_test(&conf
->pending_full_writes
))
3648 md_wakeup_thread(conf
->mddev
->thread
);
3650 if (head_sh
->batch_head
&& do_endio
)
3651 break_stripe_batch_list(head_sh
, STRIPE_EXPAND_SYNC_FLAGS
);
3655 * For RMW in write back cache, we need extra page in prexor to store the
3656 * old data. This page is stored in dev->orig_page.
3658 * This function checks whether we have data for prexor. The exact logic
3660 * R5_UPTODATE && (!R5_InJournal || R5_OrigPageUPTDODATE)
3662 static inline bool uptodate_for_rmw(struct r5dev
*dev
)
3664 return (test_bit(R5_UPTODATE
, &dev
->flags
)) &&
3665 (!test_bit(R5_InJournal
, &dev
->flags
) ||
3666 test_bit(R5_OrigPageUPTDODATE
, &dev
->flags
));
3669 static int handle_stripe_dirtying(struct r5conf
*conf
,
3670 struct stripe_head
*sh
,
3671 struct stripe_head_state
*s
,
3674 int rmw
= 0, rcw
= 0, i
;
3675 sector_t recovery_cp
= conf
->mddev
->recovery_cp
;
3677 /* Check whether resync is now happening or should start.
3678 * If yes, then the array is dirty (after unclean shutdown or
3679 * initial creation), so parity in some stripes might be inconsistent.
3680 * In this case, we need to always do reconstruct-write, to ensure
3681 * that in case of drive failure or read-error correction, we
3682 * generate correct data from the parity.
3684 if (conf
->rmw_level
== PARITY_DISABLE_RMW
||
3685 (recovery_cp
< MaxSector
&& sh
->sector
>= recovery_cp
&&
3687 /* Calculate the real rcw later - for now make it
3688 * look like rcw is cheaper
3691 pr_debug("force RCW rmw_level=%u, recovery_cp=%llu sh->sector=%llu\n",
3692 conf
->rmw_level
, (unsigned long long)recovery_cp
,
3693 (unsigned long long)sh
->sector
);
3694 } else for (i
= disks
; i
--; ) {
3695 /* would I have to read this buffer for read_modify_write */
3696 struct r5dev
*dev
= &sh
->dev
[i
];
3697 if (((dev
->towrite
&& !delay_towrite(dev
, s
)) ||
3698 i
== sh
->pd_idx
|| i
== sh
->qd_idx
||
3699 test_bit(R5_InJournal
, &dev
->flags
)) &&
3700 !test_bit(R5_LOCKED
, &dev
->flags
) &&
3701 !(uptodate_for_rmw(dev
) ||
3702 test_bit(R5_Wantcompute
, &dev
->flags
))) {
3703 if (test_bit(R5_Insync
, &dev
->flags
))
3706 rmw
+= 2*disks
; /* cannot read it */
3708 /* Would I have to read this buffer for reconstruct_write */
3709 if (!test_bit(R5_OVERWRITE
, &dev
->flags
) &&
3710 i
!= sh
->pd_idx
&& i
!= sh
->qd_idx
&&
3711 !test_bit(R5_LOCKED
, &dev
->flags
) &&
3712 !(test_bit(R5_UPTODATE
, &dev
->flags
) ||
3713 test_bit(R5_Wantcompute
, &dev
->flags
))) {
3714 if (test_bit(R5_Insync
, &dev
->flags
))
3721 pr_debug("for sector %llu, rmw=%d rcw=%d\n",
3722 (unsigned long long)sh
->sector
, rmw
, rcw
);
3723 set_bit(STRIPE_HANDLE
, &sh
->state
);
3724 if ((rmw
< rcw
|| (rmw
== rcw
&& conf
->rmw_level
== PARITY_PREFER_RMW
)) && rmw
> 0) {
3725 /* prefer read-modify-write, but need to get some data */
3726 if (conf
->mddev
->queue
)
3727 blk_add_trace_msg(conf
->mddev
->queue
,
3728 "raid5 rmw %llu %d",
3729 (unsigned long long)sh
->sector
, rmw
);
3730 for (i
= disks
; i
--; ) {
3731 struct r5dev
*dev
= &sh
->dev
[i
];
3732 if (test_bit(R5_InJournal
, &dev
->flags
) &&
3733 dev
->page
== dev
->orig_page
&&
3734 !test_bit(R5_LOCKED
, &sh
->dev
[sh
->pd_idx
].flags
)) {
3735 /* alloc page for prexor */
3736 struct page
*p
= alloc_page(GFP_NOIO
);
3744 * alloc_page() failed, try use
3745 * disk_info->extra_page
3747 if (!test_and_set_bit(R5C_EXTRA_PAGE_IN_USE
,
3748 &conf
->cache_state
)) {
3749 r5c_use_extra_page(sh
);
3753 /* extra_page in use, add to delayed_list */
3754 set_bit(STRIPE_DELAYED
, &sh
->state
);
3755 s
->waiting_extra_page
= 1;
3760 for (i
= disks
; i
--; ) {
3761 struct r5dev
*dev
= &sh
->dev
[i
];
3762 if (((dev
->towrite
&& !delay_towrite(dev
, s
)) ||
3763 i
== sh
->pd_idx
|| i
== sh
->qd_idx
||
3764 test_bit(R5_InJournal
, &dev
->flags
)) &&
3765 !test_bit(R5_LOCKED
, &dev
->flags
) &&
3766 !(uptodate_for_rmw(dev
) ||
3767 test_bit(R5_Wantcompute
, &dev
->flags
)) &&
3768 test_bit(R5_Insync
, &dev
->flags
)) {
3769 if (test_bit(STRIPE_PREREAD_ACTIVE
,
3771 pr_debug("Read_old block %d for r-m-w\n",
3773 set_bit(R5_LOCKED
, &dev
->flags
);
3774 set_bit(R5_Wantread
, &dev
->flags
);
3777 set_bit(STRIPE_DELAYED
, &sh
->state
);
3778 set_bit(STRIPE_HANDLE
, &sh
->state
);
3783 if ((rcw
< rmw
|| (rcw
== rmw
&& conf
->rmw_level
!= PARITY_PREFER_RMW
)) && rcw
> 0) {
3784 /* want reconstruct write, but need to get some data */
3787 for (i
= disks
; i
--; ) {
3788 struct r5dev
*dev
= &sh
->dev
[i
];
3789 if (!test_bit(R5_OVERWRITE
, &dev
->flags
) &&
3790 i
!= sh
->pd_idx
&& i
!= sh
->qd_idx
&&
3791 !test_bit(R5_LOCKED
, &dev
->flags
) &&
3792 !(test_bit(R5_UPTODATE
, &dev
->flags
) ||
3793 test_bit(R5_Wantcompute
, &dev
->flags
))) {
3795 if (test_bit(R5_Insync
, &dev
->flags
) &&
3796 test_bit(STRIPE_PREREAD_ACTIVE
,
3798 pr_debug("Read_old block "
3799 "%d for Reconstruct\n", i
);
3800 set_bit(R5_LOCKED
, &dev
->flags
);
3801 set_bit(R5_Wantread
, &dev
->flags
);
3805 set_bit(STRIPE_DELAYED
, &sh
->state
);
3806 set_bit(STRIPE_HANDLE
, &sh
->state
);
3810 if (rcw
&& conf
->mddev
->queue
)
3811 blk_add_trace_msg(conf
->mddev
->queue
, "raid5 rcw %llu %d %d %d",
3812 (unsigned long long)sh
->sector
,
3813 rcw
, qread
, test_bit(STRIPE_DELAYED
, &sh
->state
));
3816 if (rcw
> disks
&& rmw
> disks
&&
3817 !test_bit(STRIPE_PREREAD_ACTIVE
, &sh
->state
))
3818 set_bit(STRIPE_DELAYED
, &sh
->state
);
3820 /* now if nothing is locked, and if we have enough data,
3821 * we can start a write request
3823 /* since handle_stripe can be called at any time we need to handle the
3824 * case where a compute block operation has been submitted and then a
3825 * subsequent call wants to start a write request. raid_run_ops only
3826 * handles the case where compute block and reconstruct are requested
3827 * simultaneously. If this is not the case then new writes need to be
3828 * held off until the compute completes.
3830 if ((s
->req_compute
|| !test_bit(STRIPE_COMPUTE_RUN
, &sh
->state
)) &&
3831 (s
->locked
== 0 && (rcw
== 0 || rmw
== 0) &&
3832 !test_bit(STRIPE_BIT_DELAY
, &sh
->state
)))
3833 schedule_reconstruction(sh
, s
, rcw
== 0, 0);
3837 static void handle_parity_checks5(struct r5conf
*conf
, struct stripe_head
*sh
,
3838 struct stripe_head_state
*s
, int disks
)
3840 struct r5dev
*dev
= NULL
;
3842 BUG_ON(sh
->batch_head
);
3843 set_bit(STRIPE_HANDLE
, &sh
->state
);
3845 switch (sh
->check_state
) {
3846 case check_state_idle
:
3847 /* start a new check operation if there are no failures */
3848 if (s
->failed
== 0) {
3849 BUG_ON(s
->uptodate
!= disks
);
3850 sh
->check_state
= check_state_run
;
3851 set_bit(STRIPE_OP_CHECK
, &s
->ops_request
);
3852 clear_bit(R5_UPTODATE
, &sh
->dev
[sh
->pd_idx
].flags
);
3856 dev
= &sh
->dev
[s
->failed_num
[0]];
3858 case check_state_compute_result
:
3859 sh
->check_state
= check_state_idle
;
3861 dev
= &sh
->dev
[sh
->pd_idx
];
3863 /* check that a write has not made the stripe insync */
3864 if (test_bit(STRIPE_INSYNC
, &sh
->state
))
3867 /* either failed parity check, or recovery is happening */
3868 BUG_ON(!test_bit(R5_UPTODATE
, &dev
->flags
));
3869 BUG_ON(s
->uptodate
!= disks
);
3871 set_bit(R5_LOCKED
, &dev
->flags
);
3873 set_bit(R5_Wantwrite
, &dev
->flags
);
3875 clear_bit(STRIPE_DEGRADED
, &sh
->state
);
3876 set_bit(STRIPE_INSYNC
, &sh
->state
);
3878 case check_state_run
:
3879 break; /* we will be called again upon completion */
3880 case check_state_check_result
:
3881 sh
->check_state
= check_state_idle
;
3883 /* if a failure occurred during the check operation, leave
3884 * STRIPE_INSYNC not set and let the stripe be handled again
3889 /* handle a successful check operation, if parity is correct
3890 * we are done. Otherwise update the mismatch count and repair
3891 * parity if !MD_RECOVERY_CHECK
3893 if ((sh
->ops
.zero_sum_result
& SUM_CHECK_P_RESULT
) == 0)
3894 /* parity is correct (on disc,
3895 * not in buffer any more)
3897 set_bit(STRIPE_INSYNC
, &sh
->state
);
3899 atomic64_add(STRIPE_SECTORS
, &conf
->mddev
->resync_mismatches
);
3900 if (test_bit(MD_RECOVERY_CHECK
, &conf
->mddev
->recovery
))
3901 /* don't try to repair!! */
3902 set_bit(STRIPE_INSYNC
, &sh
->state
);
3904 sh
->check_state
= check_state_compute_run
;
3905 set_bit(STRIPE_COMPUTE_RUN
, &sh
->state
);
3906 set_bit(STRIPE_OP_COMPUTE_BLK
, &s
->ops_request
);
3907 set_bit(R5_Wantcompute
,
3908 &sh
->dev
[sh
->pd_idx
].flags
);
3909 sh
->ops
.target
= sh
->pd_idx
;
3910 sh
->ops
.target2
= -1;
3915 case check_state_compute_run
:
3918 pr_err("%s: unknown check_state: %d sector: %llu\n",
3919 __func__
, sh
->check_state
,
3920 (unsigned long long) sh
->sector
);
3925 static void handle_parity_checks6(struct r5conf
*conf
, struct stripe_head
*sh
,
3926 struct stripe_head_state
*s
,
3929 int pd_idx
= sh
->pd_idx
;
3930 int qd_idx
= sh
->qd_idx
;
3933 BUG_ON(sh
->batch_head
);
3934 set_bit(STRIPE_HANDLE
, &sh
->state
);
3936 BUG_ON(s
->failed
> 2);
3938 /* Want to check and possibly repair P and Q.
3939 * However there could be one 'failed' device, in which
3940 * case we can only check one of them, possibly using the
3941 * other to generate missing data
3944 switch (sh
->check_state
) {
3945 case check_state_idle
:
3946 /* start a new check operation if there are < 2 failures */
3947 if (s
->failed
== s
->q_failed
) {
3948 /* The only possible failed device holds Q, so it
3949 * makes sense to check P (If anything else were failed,
3950 * we would have used P to recreate it).
3952 sh
->check_state
= check_state_run
;
3954 if (!s
->q_failed
&& s
->failed
< 2) {
3955 /* Q is not failed, and we didn't use it to generate
3956 * anything, so it makes sense to check it
3958 if (sh
->check_state
== check_state_run
)
3959 sh
->check_state
= check_state_run_pq
;
3961 sh
->check_state
= check_state_run_q
;
3964 /* discard potentially stale zero_sum_result */
3965 sh
->ops
.zero_sum_result
= 0;
3967 if (sh
->check_state
== check_state_run
) {
3968 /* async_xor_zero_sum destroys the contents of P */
3969 clear_bit(R5_UPTODATE
, &sh
->dev
[pd_idx
].flags
);
3972 if (sh
->check_state
>= check_state_run
&&
3973 sh
->check_state
<= check_state_run_pq
) {
3974 /* async_syndrome_zero_sum preserves P and Q, so
3975 * no need to mark them !uptodate here
3977 set_bit(STRIPE_OP_CHECK
, &s
->ops_request
);
3981 /* we have 2-disk failure */
3982 BUG_ON(s
->failed
!= 2);
3984 case check_state_compute_result
:
3985 sh
->check_state
= check_state_idle
;
3987 /* check that a write has not made the stripe insync */
3988 if (test_bit(STRIPE_INSYNC
, &sh
->state
))
3991 /* now write out any block on a failed drive,
3992 * or P or Q if they were recomputed
3994 BUG_ON(s
->uptodate
< disks
- 1); /* We don't need Q to recover */
3995 if (s
->failed
== 2) {
3996 dev
= &sh
->dev
[s
->failed_num
[1]];
3998 set_bit(R5_LOCKED
, &dev
->flags
);
3999 set_bit(R5_Wantwrite
, &dev
->flags
);
4001 if (s
->failed
>= 1) {
4002 dev
= &sh
->dev
[s
->failed_num
[0]];
4004 set_bit(R5_LOCKED
, &dev
->flags
);
4005 set_bit(R5_Wantwrite
, &dev
->flags
);
4007 if (sh
->ops
.zero_sum_result
& SUM_CHECK_P_RESULT
) {
4008 dev
= &sh
->dev
[pd_idx
];
4010 set_bit(R5_LOCKED
, &dev
->flags
);
4011 set_bit(R5_Wantwrite
, &dev
->flags
);
4013 if (sh
->ops
.zero_sum_result
& SUM_CHECK_Q_RESULT
) {
4014 dev
= &sh
->dev
[qd_idx
];
4016 set_bit(R5_LOCKED
, &dev
->flags
);
4017 set_bit(R5_Wantwrite
, &dev
->flags
);
4019 clear_bit(STRIPE_DEGRADED
, &sh
->state
);
4021 set_bit(STRIPE_INSYNC
, &sh
->state
);
4023 case check_state_run
:
4024 case check_state_run_q
:
4025 case check_state_run_pq
:
4026 break; /* we will be called again upon completion */
4027 case check_state_check_result
:
4028 sh
->check_state
= check_state_idle
;
4030 /* handle a successful check operation, if parity is correct
4031 * we are done. Otherwise update the mismatch count and repair
4032 * parity if !MD_RECOVERY_CHECK
4034 if (sh
->ops
.zero_sum_result
== 0) {
4035 /* both parities are correct */
4037 set_bit(STRIPE_INSYNC
, &sh
->state
);
4039 /* in contrast to the raid5 case we can validate
4040 * parity, but still have a failure to write
4043 sh
->check_state
= check_state_compute_result
;
4044 /* Returning at this point means that we may go
4045 * off and bring p and/or q uptodate again so
4046 * we make sure to check zero_sum_result again
4047 * to verify if p or q need writeback
4051 atomic64_add(STRIPE_SECTORS
, &conf
->mddev
->resync_mismatches
);
4052 if (test_bit(MD_RECOVERY_CHECK
, &conf
->mddev
->recovery
))
4053 /* don't try to repair!! */
4054 set_bit(STRIPE_INSYNC
, &sh
->state
);
4056 int *target
= &sh
->ops
.target
;
4058 sh
->ops
.target
= -1;
4059 sh
->ops
.target2
= -1;
4060 sh
->check_state
= check_state_compute_run
;
4061 set_bit(STRIPE_COMPUTE_RUN
, &sh
->state
);
4062 set_bit(STRIPE_OP_COMPUTE_BLK
, &s
->ops_request
);
4063 if (sh
->ops
.zero_sum_result
& SUM_CHECK_P_RESULT
) {
4064 set_bit(R5_Wantcompute
,
4065 &sh
->dev
[pd_idx
].flags
);
4067 target
= &sh
->ops
.target2
;
4070 if (sh
->ops
.zero_sum_result
& SUM_CHECK_Q_RESULT
) {
4071 set_bit(R5_Wantcompute
,
4072 &sh
->dev
[qd_idx
].flags
);
4079 case check_state_compute_run
:
4082 pr_warn("%s: unknown check_state: %d sector: %llu\n",
4083 __func__
, sh
->check_state
,
4084 (unsigned long long) sh
->sector
);
4089 static void handle_stripe_expansion(struct r5conf
*conf
, struct stripe_head
*sh
)
4093 /* We have read all the blocks in this stripe and now we need to
4094 * copy some of them into a target stripe for expand.
4096 struct dma_async_tx_descriptor
*tx
= NULL
;
4097 BUG_ON(sh
->batch_head
);
4098 clear_bit(STRIPE_EXPAND_SOURCE
, &sh
->state
);
4099 for (i
= 0; i
< sh
->disks
; i
++)
4100 if (i
!= sh
->pd_idx
&& i
!= sh
->qd_idx
) {
4102 struct stripe_head
*sh2
;
4103 struct async_submit_ctl submit
;
4105 sector_t bn
= raid5_compute_blocknr(sh
, i
, 1);
4106 sector_t s
= raid5_compute_sector(conf
, bn
, 0,
4108 sh2
= raid5_get_active_stripe(conf
, s
, 0, 1, 1);
4110 /* so far only the early blocks of this stripe
4111 * have been requested. When later blocks
4112 * get requested, we will try again
4115 if (!test_bit(STRIPE_EXPANDING
, &sh2
->state
) ||
4116 test_bit(R5_Expanded
, &sh2
->dev
[dd_idx
].flags
)) {
4117 /* must have already done this block */
4118 raid5_release_stripe(sh2
);
4122 /* place all the copies on one channel */
4123 init_async_submit(&submit
, 0, tx
, NULL
, NULL
, NULL
);
4124 tx
= async_memcpy(sh2
->dev
[dd_idx
].page
,
4125 sh
->dev
[i
].page
, 0, 0, STRIPE_SIZE
,
4128 set_bit(R5_Expanded
, &sh2
->dev
[dd_idx
].flags
);
4129 set_bit(R5_UPTODATE
, &sh2
->dev
[dd_idx
].flags
);
4130 for (j
= 0; j
< conf
->raid_disks
; j
++)
4131 if (j
!= sh2
->pd_idx
&&
4133 !test_bit(R5_Expanded
, &sh2
->dev
[j
].flags
))
4135 if (j
== conf
->raid_disks
) {
4136 set_bit(STRIPE_EXPAND_READY
, &sh2
->state
);
4137 set_bit(STRIPE_HANDLE
, &sh2
->state
);
4139 raid5_release_stripe(sh2
);
4142 /* done submitting copies, wait for them to complete */
4143 async_tx_quiesce(&tx
);
4147 * handle_stripe - do things to a stripe.
4149 * We lock the stripe by setting STRIPE_ACTIVE and then examine the
4150 * state of various bits to see what needs to be done.
4152 * return some read requests which now have data
4153 * return some write requests which are safely on storage
4154 * schedule a read on some buffers
4155 * schedule a write of some buffers
4156 * return confirmation of parity correctness
4160 static void analyse_stripe(struct stripe_head
*sh
, struct stripe_head_state
*s
)
4162 struct r5conf
*conf
= sh
->raid_conf
;
4163 int disks
= sh
->disks
;
4166 int do_recovery
= 0;
4168 memset(s
, 0, sizeof(*s
));
4170 s
->expanding
= test_bit(STRIPE_EXPAND_SOURCE
, &sh
->state
) && !sh
->batch_head
;
4171 s
->expanded
= test_bit(STRIPE_EXPAND_READY
, &sh
->state
) && !sh
->batch_head
;
4172 s
->failed_num
[0] = -1;
4173 s
->failed_num
[1] = -1;
4174 s
->log_failed
= r5l_log_disk_error(conf
);
4176 /* Now to look around and see what can be done */
4178 for (i
=disks
; i
--; ) {
4179 struct md_rdev
*rdev
;
4186 pr_debug("check %d: state 0x%lx read %p write %p written %p\n",
4188 dev
->toread
, dev
->towrite
, dev
->written
);
4189 /* maybe we can reply to a read
4191 * new wantfill requests are only permitted while
4192 * ops_complete_biofill is guaranteed to be inactive
4194 if (test_bit(R5_UPTODATE
, &dev
->flags
) && dev
->toread
&&
4195 !test_bit(STRIPE_BIOFILL_RUN
, &sh
->state
))
4196 set_bit(R5_Wantfill
, &dev
->flags
);
4198 /* now count some things */
4199 if (test_bit(R5_LOCKED
, &dev
->flags
))
4201 if (test_bit(R5_UPTODATE
, &dev
->flags
))
4203 if (test_bit(R5_Wantcompute
, &dev
->flags
)) {
4205 BUG_ON(s
->compute
> 2);
4208 if (test_bit(R5_Wantfill
, &dev
->flags
))
4210 else if (dev
->toread
)
4214 if (!test_bit(R5_OVERWRITE
, &dev
->flags
))
4219 /* Prefer to use the replacement for reads, but only
4220 * if it is recovered enough and has no bad blocks.
4222 rdev
= rcu_dereference(conf
->disks
[i
].replacement
);
4223 if (rdev
&& !test_bit(Faulty
, &rdev
->flags
) &&
4224 rdev
->recovery_offset
>= sh
->sector
+ STRIPE_SECTORS
&&
4225 !is_badblock(rdev
, sh
->sector
, STRIPE_SECTORS
,
4226 &first_bad
, &bad_sectors
))
4227 set_bit(R5_ReadRepl
, &dev
->flags
);
4229 if (rdev
&& !test_bit(Faulty
, &rdev
->flags
))
4230 set_bit(R5_NeedReplace
, &dev
->flags
);
4232 clear_bit(R5_NeedReplace
, &dev
->flags
);
4233 rdev
= rcu_dereference(conf
->disks
[i
].rdev
);
4234 clear_bit(R5_ReadRepl
, &dev
->flags
);
4236 if (rdev
&& test_bit(Faulty
, &rdev
->flags
))
4239 is_bad
= is_badblock(rdev
, sh
->sector
, STRIPE_SECTORS
,
4240 &first_bad
, &bad_sectors
);
4241 if (s
->blocked_rdev
== NULL
4242 && (test_bit(Blocked
, &rdev
->flags
)
4245 set_bit(BlockedBadBlocks
,
4247 s
->blocked_rdev
= rdev
;
4248 atomic_inc(&rdev
->nr_pending
);
4251 clear_bit(R5_Insync
, &dev
->flags
);
4255 /* also not in-sync */
4256 if (!test_bit(WriteErrorSeen
, &rdev
->flags
) &&
4257 test_bit(R5_UPTODATE
, &dev
->flags
)) {
4258 /* treat as in-sync, but with a read error
4259 * which we can now try to correct
4261 set_bit(R5_Insync
, &dev
->flags
);
4262 set_bit(R5_ReadError
, &dev
->flags
);
4264 } else if (test_bit(In_sync
, &rdev
->flags
))
4265 set_bit(R5_Insync
, &dev
->flags
);
4266 else if (sh
->sector
+ STRIPE_SECTORS
<= rdev
->recovery_offset
)
4267 /* in sync if before recovery_offset */
4268 set_bit(R5_Insync
, &dev
->flags
);
4269 else if (test_bit(R5_UPTODATE
, &dev
->flags
) &&
4270 test_bit(R5_Expanded
, &dev
->flags
))
4271 /* If we've reshaped into here, we assume it is Insync.
4272 * We will shortly update recovery_offset to make
4275 set_bit(R5_Insync
, &dev
->flags
);
4277 if (test_bit(R5_WriteError
, &dev
->flags
)) {
4278 /* This flag does not apply to '.replacement'
4279 * only to .rdev, so make sure to check that*/
4280 struct md_rdev
*rdev2
= rcu_dereference(
4281 conf
->disks
[i
].rdev
);
4283 clear_bit(R5_Insync
, &dev
->flags
);
4284 if (rdev2
&& !test_bit(Faulty
, &rdev2
->flags
)) {
4285 s
->handle_bad_blocks
= 1;
4286 atomic_inc(&rdev2
->nr_pending
);
4288 clear_bit(R5_WriteError
, &dev
->flags
);
4290 if (test_bit(R5_MadeGood
, &dev
->flags
)) {
4291 /* This flag does not apply to '.replacement'
4292 * only to .rdev, so make sure to check that*/
4293 struct md_rdev
*rdev2
= rcu_dereference(
4294 conf
->disks
[i
].rdev
);
4295 if (rdev2
&& !test_bit(Faulty
, &rdev2
->flags
)) {
4296 s
->handle_bad_blocks
= 1;
4297 atomic_inc(&rdev2
->nr_pending
);
4299 clear_bit(R5_MadeGood
, &dev
->flags
);
4301 if (test_bit(R5_MadeGoodRepl
, &dev
->flags
)) {
4302 struct md_rdev
*rdev2
= rcu_dereference(
4303 conf
->disks
[i
].replacement
);
4304 if (rdev2
&& !test_bit(Faulty
, &rdev2
->flags
)) {
4305 s
->handle_bad_blocks
= 1;
4306 atomic_inc(&rdev2
->nr_pending
);
4308 clear_bit(R5_MadeGoodRepl
, &dev
->flags
);
4310 if (!test_bit(R5_Insync
, &dev
->flags
)) {
4311 /* The ReadError flag will just be confusing now */
4312 clear_bit(R5_ReadError
, &dev
->flags
);
4313 clear_bit(R5_ReWrite
, &dev
->flags
);
4315 if (test_bit(R5_ReadError
, &dev
->flags
))
4316 clear_bit(R5_Insync
, &dev
->flags
);
4317 if (!test_bit(R5_Insync
, &dev
->flags
)) {
4319 s
->failed_num
[s
->failed
] = i
;
4321 if (rdev
&& !test_bit(Faulty
, &rdev
->flags
))
4325 if (test_bit(R5_InJournal
, &dev
->flags
))
4327 if (test_bit(R5_InJournal
, &dev
->flags
) && dev
->written
)
4330 if (test_bit(STRIPE_SYNCING
, &sh
->state
)) {
4331 /* If there is a failed device being replaced,
4332 * we must be recovering.
4333 * else if we are after recovery_cp, we must be syncing
4334 * else if MD_RECOVERY_REQUESTED is set, we also are syncing.
4335 * else we can only be replacing
4336 * sync and recovery both need to read all devices, and so
4337 * use the same flag.
4340 sh
->sector
>= conf
->mddev
->recovery_cp
||
4341 test_bit(MD_RECOVERY_REQUESTED
, &(conf
->mddev
->recovery
)))
4349 static int clear_batch_ready(struct stripe_head
*sh
)
4351 /* Return '1' if this is a member of batch, or
4352 * '0' if it is a lone stripe or a head which can now be
4355 struct stripe_head
*tmp
;
4356 if (!test_and_clear_bit(STRIPE_BATCH_READY
, &sh
->state
))
4357 return (sh
->batch_head
&& sh
->batch_head
!= sh
);
4358 spin_lock(&sh
->stripe_lock
);
4359 if (!sh
->batch_head
) {
4360 spin_unlock(&sh
->stripe_lock
);
4365 * this stripe could be added to a batch list before we check
4366 * BATCH_READY, skips it
4368 if (sh
->batch_head
!= sh
) {
4369 spin_unlock(&sh
->stripe_lock
);
4372 spin_lock(&sh
->batch_lock
);
4373 list_for_each_entry(tmp
, &sh
->batch_list
, batch_list
)
4374 clear_bit(STRIPE_BATCH_READY
, &tmp
->state
);
4375 spin_unlock(&sh
->batch_lock
);
4376 spin_unlock(&sh
->stripe_lock
);
4379 * BATCH_READY is cleared, no new stripes can be added.
4380 * batch_list can be accessed without lock
4385 static void break_stripe_batch_list(struct stripe_head
*head_sh
,
4386 unsigned long handle_flags
)
4388 struct stripe_head
*sh
, *next
;
4392 list_for_each_entry_safe(sh
, next
, &head_sh
->batch_list
, batch_list
) {
4394 list_del_init(&sh
->batch_list
);
4396 WARN_ONCE(sh
->state
& ((1 << STRIPE_ACTIVE
) |
4397 (1 << STRIPE_SYNCING
) |
4398 (1 << STRIPE_REPLACED
) |
4399 (1 << STRIPE_DELAYED
) |
4400 (1 << STRIPE_BIT_DELAY
) |
4401 (1 << STRIPE_FULL_WRITE
) |
4402 (1 << STRIPE_BIOFILL_RUN
) |
4403 (1 << STRIPE_COMPUTE_RUN
) |
4404 (1 << STRIPE_OPS_REQ_PENDING
) |
4405 (1 << STRIPE_DISCARD
) |
4406 (1 << STRIPE_BATCH_READY
) |
4407 (1 << STRIPE_BATCH_ERR
) |
4408 (1 << STRIPE_BITMAP_PENDING
)),
4409 "stripe state: %lx\n", sh
->state
);
4410 WARN_ONCE(head_sh
->state
& ((1 << STRIPE_DISCARD
) |
4411 (1 << STRIPE_REPLACED
)),
4412 "head stripe state: %lx\n", head_sh
->state
);
4414 set_mask_bits(&sh
->state
, ~(STRIPE_EXPAND_SYNC_FLAGS
|
4415 (1 << STRIPE_PREREAD_ACTIVE
) |
4416 (1 << STRIPE_DEGRADED
)),
4417 head_sh
->state
& (1 << STRIPE_INSYNC
));
4419 sh
->check_state
= head_sh
->check_state
;
4420 sh
->reconstruct_state
= head_sh
->reconstruct_state
;
4421 for (i
= 0; i
< sh
->disks
; i
++) {
4422 if (test_and_clear_bit(R5_Overlap
, &sh
->dev
[i
].flags
))
4424 sh
->dev
[i
].flags
= head_sh
->dev
[i
].flags
&
4425 (~((1 << R5_WriteError
) | (1 << R5_Overlap
)));
4427 spin_lock_irq(&sh
->stripe_lock
);
4428 sh
->batch_head
= NULL
;
4429 spin_unlock_irq(&sh
->stripe_lock
);
4430 if (handle_flags
== 0 ||
4431 sh
->state
& handle_flags
)
4432 set_bit(STRIPE_HANDLE
, &sh
->state
);
4433 raid5_release_stripe(sh
);
4435 spin_lock_irq(&head_sh
->stripe_lock
);
4436 head_sh
->batch_head
= NULL
;
4437 spin_unlock_irq(&head_sh
->stripe_lock
);
4438 for (i
= 0; i
< head_sh
->disks
; i
++)
4439 if (test_and_clear_bit(R5_Overlap
, &head_sh
->dev
[i
].flags
))
4441 if (head_sh
->state
& handle_flags
)
4442 set_bit(STRIPE_HANDLE
, &head_sh
->state
);
4445 wake_up(&head_sh
->raid_conf
->wait_for_overlap
);
4448 static void handle_stripe(struct stripe_head
*sh
)
4450 struct stripe_head_state s
;
4451 struct r5conf
*conf
= sh
->raid_conf
;
4454 int disks
= sh
->disks
;
4455 struct r5dev
*pdev
, *qdev
;
4457 clear_bit(STRIPE_HANDLE
, &sh
->state
);
4458 if (test_and_set_bit_lock(STRIPE_ACTIVE
, &sh
->state
)) {
4459 /* already being handled, ensure it gets handled
4460 * again when current action finishes */
4461 set_bit(STRIPE_HANDLE
, &sh
->state
);
4465 if (clear_batch_ready(sh
) ) {
4466 clear_bit_unlock(STRIPE_ACTIVE
, &sh
->state
);
4470 if (test_and_clear_bit(STRIPE_BATCH_ERR
, &sh
->state
))
4471 break_stripe_batch_list(sh
, 0);
4473 if (test_bit(STRIPE_SYNC_REQUESTED
, &sh
->state
) && !sh
->batch_head
) {
4474 spin_lock(&sh
->stripe_lock
);
4475 /* Cannot process 'sync' concurrently with 'discard' */
4476 if (!test_bit(STRIPE_DISCARD
, &sh
->state
) &&
4477 test_and_clear_bit(STRIPE_SYNC_REQUESTED
, &sh
->state
)) {
4478 set_bit(STRIPE_SYNCING
, &sh
->state
);
4479 clear_bit(STRIPE_INSYNC
, &sh
->state
);
4480 clear_bit(STRIPE_REPLACED
, &sh
->state
);
4482 spin_unlock(&sh
->stripe_lock
);
4484 clear_bit(STRIPE_DELAYED
, &sh
->state
);
4486 pr_debug("handling stripe %llu, state=%#lx cnt=%d, "
4487 "pd_idx=%d, qd_idx=%d\n, check:%d, reconstruct:%d\n",
4488 (unsigned long long)sh
->sector
, sh
->state
,
4489 atomic_read(&sh
->count
), sh
->pd_idx
, sh
->qd_idx
,
4490 sh
->check_state
, sh
->reconstruct_state
);
4492 analyse_stripe(sh
, &s
);
4494 if (test_bit(STRIPE_LOG_TRAPPED
, &sh
->state
))
4497 if (s
.handle_bad_blocks
) {
4498 set_bit(STRIPE_HANDLE
, &sh
->state
);
4502 if (unlikely(s
.blocked_rdev
)) {
4503 if (s
.syncing
|| s
.expanding
|| s
.expanded
||
4504 s
.replacing
|| s
.to_write
|| s
.written
) {
4505 set_bit(STRIPE_HANDLE
, &sh
->state
);
4508 /* There is nothing for the blocked_rdev to block */
4509 rdev_dec_pending(s
.blocked_rdev
, conf
->mddev
);
4510 s
.blocked_rdev
= NULL
;
4513 if (s
.to_fill
&& !test_bit(STRIPE_BIOFILL_RUN
, &sh
->state
)) {
4514 set_bit(STRIPE_OP_BIOFILL
, &s
.ops_request
);
4515 set_bit(STRIPE_BIOFILL_RUN
, &sh
->state
);
4518 pr_debug("locked=%d uptodate=%d to_read=%d"
4519 " to_write=%d failed=%d failed_num=%d,%d\n",
4520 s
.locked
, s
.uptodate
, s
.to_read
, s
.to_write
, s
.failed
,
4521 s
.failed_num
[0], s
.failed_num
[1]);
4522 /* check if the array has lost more than max_degraded devices and,
4523 * if so, some requests might need to be failed.
4525 if (s
.failed
> conf
->max_degraded
|| s
.log_failed
) {
4526 sh
->check_state
= 0;
4527 sh
->reconstruct_state
= 0;
4528 break_stripe_batch_list(sh
, 0);
4529 if (s
.to_read
+s
.to_write
+s
.written
)
4530 handle_failed_stripe(conf
, sh
, &s
, disks
, &s
.return_bi
);
4531 if (s
.syncing
+ s
.replacing
)
4532 handle_failed_sync(conf
, sh
, &s
);
4535 /* Now we check to see if any write operations have recently
4539 if (sh
->reconstruct_state
== reconstruct_state_prexor_drain_result
)
4541 if (sh
->reconstruct_state
== reconstruct_state_drain_result
||
4542 sh
->reconstruct_state
== reconstruct_state_prexor_drain_result
) {
4543 sh
->reconstruct_state
= reconstruct_state_idle
;
4545 /* All the 'written' buffers and the parity block are ready to
4546 * be written back to disk
4548 BUG_ON(!test_bit(R5_UPTODATE
, &sh
->dev
[sh
->pd_idx
].flags
) &&
4549 !test_bit(R5_Discard
, &sh
->dev
[sh
->pd_idx
].flags
));
4550 BUG_ON(sh
->qd_idx
>= 0 &&
4551 !test_bit(R5_UPTODATE
, &sh
->dev
[sh
->qd_idx
].flags
) &&
4552 !test_bit(R5_Discard
, &sh
->dev
[sh
->qd_idx
].flags
));
4553 for (i
= disks
; i
--; ) {
4554 struct r5dev
*dev
= &sh
->dev
[i
];
4555 if (test_bit(R5_LOCKED
, &dev
->flags
) &&
4556 (i
== sh
->pd_idx
|| i
== sh
->qd_idx
||
4557 dev
->written
|| test_bit(R5_InJournal
,
4559 pr_debug("Writing block %d\n", i
);
4560 set_bit(R5_Wantwrite
, &dev
->flags
);
4565 if (!test_bit(R5_Insync
, &dev
->flags
) ||
4566 ((i
== sh
->pd_idx
|| i
== sh
->qd_idx
) &&
4568 set_bit(STRIPE_INSYNC
, &sh
->state
);
4571 if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE
, &sh
->state
))
4572 s
.dec_preread_active
= 1;
4576 * might be able to return some write requests if the parity blocks
4577 * are safe, or on a failed drive
4579 pdev
= &sh
->dev
[sh
->pd_idx
];
4580 s
.p_failed
= (s
.failed
>= 1 && s
.failed_num
[0] == sh
->pd_idx
)
4581 || (s
.failed
>= 2 && s
.failed_num
[1] == sh
->pd_idx
);
4582 qdev
= &sh
->dev
[sh
->qd_idx
];
4583 s
.q_failed
= (s
.failed
>= 1 && s
.failed_num
[0] == sh
->qd_idx
)
4584 || (s
.failed
>= 2 && s
.failed_num
[1] == sh
->qd_idx
)
4588 (s
.p_failed
|| ((test_bit(R5_Insync
, &pdev
->flags
)
4589 && !test_bit(R5_LOCKED
, &pdev
->flags
)
4590 && (test_bit(R5_UPTODATE
, &pdev
->flags
) ||
4591 test_bit(R5_Discard
, &pdev
->flags
))))) &&
4592 (s
.q_failed
|| ((test_bit(R5_Insync
, &qdev
->flags
)
4593 && !test_bit(R5_LOCKED
, &qdev
->flags
)
4594 && (test_bit(R5_UPTODATE
, &qdev
->flags
) ||
4595 test_bit(R5_Discard
, &qdev
->flags
))))))
4596 handle_stripe_clean_event(conf
, sh
, disks
, &s
.return_bi
);
4599 r5c_handle_cached_data_endio(conf
, sh
, disks
, &s
.return_bi
);
4600 r5l_stripe_write_finished(sh
);
4602 /* Now we might consider reading some blocks, either to check/generate
4603 * parity, or to satisfy requests
4604 * or to load a block that is being partially written.
4606 if (s
.to_read
|| s
.non_overwrite
4607 || (conf
->level
== 6 && s
.to_write
&& s
.failed
)
4608 || (s
.syncing
&& (s
.uptodate
+ s
.compute
< disks
))
4611 handle_stripe_fill(sh
, &s
, disks
);
4614 * When the stripe finishes full journal write cycle (write to journal
4615 * and raid disk), this is the clean up procedure so it is ready for
4618 r5c_finish_stripe_write_out(conf
, sh
, &s
);
4621 * Now to consider new write requests, cache write back and what else,
4622 * if anything should be read. We do not handle new writes when:
4623 * 1/ A 'write' operation (copy+xor) is already in flight.
4624 * 2/ A 'check' operation is in flight, as it may clobber the parity
4626 * 3/ A r5c cache log write is in flight.
4629 if (!sh
->reconstruct_state
&& !sh
->check_state
&& !sh
->log_io
) {
4630 if (!r5c_is_writeback(conf
->log
)) {
4632 handle_stripe_dirtying(conf
, sh
, &s
, disks
);
4633 } else { /* write back cache */
4636 /* First, try handle writes in caching phase */
4638 ret
= r5c_try_caching_write(conf
, sh
, &s
,
4641 * If caching phase failed: ret == -EAGAIN
4643 * stripe under reclaim: !caching && injournal
4645 * fall back to handle_stripe_dirtying()
4647 if (ret
== -EAGAIN
||
4648 /* stripe under reclaim: !caching && injournal */
4649 (!test_bit(STRIPE_R5C_CACHING
, &sh
->state
) &&
4651 ret
= handle_stripe_dirtying(conf
, sh
, &s
,
4659 /* maybe we need to check and possibly fix the parity for this stripe
4660 * Any reads will already have been scheduled, so we just see if enough
4661 * data is available. The parity check is held off while parity
4662 * dependent operations are in flight.
4664 if (sh
->check_state
||
4665 (s
.syncing
&& s
.locked
== 0 &&
4666 !test_bit(STRIPE_COMPUTE_RUN
, &sh
->state
) &&
4667 !test_bit(STRIPE_INSYNC
, &sh
->state
))) {
4668 if (conf
->level
== 6)
4669 handle_parity_checks6(conf
, sh
, &s
, disks
);
4671 handle_parity_checks5(conf
, sh
, &s
, disks
);
4674 if ((s
.replacing
|| s
.syncing
) && s
.locked
== 0
4675 && !test_bit(STRIPE_COMPUTE_RUN
, &sh
->state
)
4676 && !test_bit(STRIPE_REPLACED
, &sh
->state
)) {
4677 /* Write out to replacement devices where possible */
4678 for (i
= 0; i
< conf
->raid_disks
; i
++)
4679 if (test_bit(R5_NeedReplace
, &sh
->dev
[i
].flags
)) {
4680 WARN_ON(!test_bit(R5_UPTODATE
, &sh
->dev
[i
].flags
));
4681 set_bit(R5_WantReplace
, &sh
->dev
[i
].flags
);
4682 set_bit(R5_LOCKED
, &sh
->dev
[i
].flags
);
4686 set_bit(STRIPE_INSYNC
, &sh
->state
);
4687 set_bit(STRIPE_REPLACED
, &sh
->state
);
4689 if ((s
.syncing
|| s
.replacing
) && s
.locked
== 0 &&
4690 !test_bit(STRIPE_COMPUTE_RUN
, &sh
->state
) &&
4691 test_bit(STRIPE_INSYNC
, &sh
->state
)) {
4692 md_done_sync(conf
->mddev
, STRIPE_SECTORS
, 1);
4693 clear_bit(STRIPE_SYNCING
, &sh
->state
);
4694 if (test_and_clear_bit(R5_Overlap
, &sh
->dev
[sh
->pd_idx
].flags
))
4695 wake_up(&conf
->wait_for_overlap
);
4698 /* If the failed drives are just a ReadError, then we might need
4699 * to progress the repair/check process
4701 if (s
.failed
<= conf
->max_degraded
&& !conf
->mddev
->ro
)
4702 for (i
= 0; i
< s
.failed
; i
++) {
4703 struct r5dev
*dev
= &sh
->dev
[s
.failed_num
[i
]];
4704 if (test_bit(R5_ReadError
, &dev
->flags
)
4705 && !test_bit(R5_LOCKED
, &dev
->flags
)
4706 && test_bit(R5_UPTODATE
, &dev
->flags
)
4708 if (!test_bit(R5_ReWrite
, &dev
->flags
)) {
4709 set_bit(R5_Wantwrite
, &dev
->flags
);
4710 set_bit(R5_ReWrite
, &dev
->flags
);
4711 set_bit(R5_LOCKED
, &dev
->flags
);
4714 /* let's read it back */
4715 set_bit(R5_Wantread
, &dev
->flags
);
4716 set_bit(R5_LOCKED
, &dev
->flags
);
4722 /* Finish reconstruct operations initiated by the expansion process */
4723 if (sh
->reconstruct_state
== reconstruct_state_result
) {
4724 struct stripe_head
*sh_src
4725 = raid5_get_active_stripe(conf
, sh
->sector
, 1, 1, 1);
4726 if (sh_src
&& test_bit(STRIPE_EXPAND_SOURCE
, &sh_src
->state
)) {
4727 /* sh cannot be written until sh_src has been read.
4728 * so arrange for sh to be delayed a little
4730 set_bit(STRIPE_DELAYED
, &sh
->state
);
4731 set_bit(STRIPE_HANDLE
, &sh
->state
);
4732 if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE
,
4734 atomic_inc(&conf
->preread_active_stripes
);
4735 raid5_release_stripe(sh_src
);
4739 raid5_release_stripe(sh_src
);
4741 sh
->reconstruct_state
= reconstruct_state_idle
;
4742 clear_bit(STRIPE_EXPANDING
, &sh
->state
);
4743 for (i
= conf
->raid_disks
; i
--; ) {
4744 set_bit(R5_Wantwrite
, &sh
->dev
[i
].flags
);
4745 set_bit(R5_LOCKED
, &sh
->dev
[i
].flags
);
4750 if (s
.expanded
&& test_bit(STRIPE_EXPANDING
, &sh
->state
) &&
4751 !sh
->reconstruct_state
) {
4752 /* Need to write out all blocks after computing parity */
4753 sh
->disks
= conf
->raid_disks
;
4754 stripe_set_idx(sh
->sector
, conf
, 0, sh
);
4755 schedule_reconstruction(sh
, &s
, 1, 1);
4756 } else if (s
.expanded
&& !sh
->reconstruct_state
&& s
.locked
== 0) {
4757 clear_bit(STRIPE_EXPAND_READY
, &sh
->state
);
4758 atomic_dec(&conf
->reshape_stripes
);
4759 wake_up(&conf
->wait_for_overlap
);
4760 md_done_sync(conf
->mddev
, STRIPE_SECTORS
, 1);
4763 if (s
.expanding
&& s
.locked
== 0 &&
4764 !test_bit(STRIPE_COMPUTE_RUN
, &sh
->state
))
4765 handle_stripe_expansion(conf
, sh
);
4768 /* wait for this device to become unblocked */
4769 if (unlikely(s
.blocked_rdev
)) {
4770 if (conf
->mddev
->external
)
4771 md_wait_for_blocked_rdev(s
.blocked_rdev
,
4774 /* Internal metadata will immediately
4775 * be written by raid5d, so we don't
4776 * need to wait here.
4778 rdev_dec_pending(s
.blocked_rdev
,
4782 if (s
.handle_bad_blocks
)
4783 for (i
= disks
; i
--; ) {
4784 struct md_rdev
*rdev
;
4785 struct r5dev
*dev
= &sh
->dev
[i
];
4786 if (test_and_clear_bit(R5_WriteError
, &dev
->flags
)) {
4787 /* We own a safe reference to the rdev */
4788 rdev
= conf
->disks
[i
].rdev
;
4789 if (!rdev_set_badblocks(rdev
, sh
->sector
,
4791 md_error(conf
->mddev
, rdev
);
4792 rdev_dec_pending(rdev
, conf
->mddev
);
4794 if (test_and_clear_bit(R5_MadeGood
, &dev
->flags
)) {
4795 rdev
= conf
->disks
[i
].rdev
;
4796 rdev_clear_badblocks(rdev
, sh
->sector
,
4798 rdev_dec_pending(rdev
, conf
->mddev
);
4800 if (test_and_clear_bit(R5_MadeGoodRepl
, &dev
->flags
)) {
4801 rdev
= conf
->disks
[i
].replacement
;
4803 /* rdev have been moved down */
4804 rdev
= conf
->disks
[i
].rdev
;
4805 rdev_clear_badblocks(rdev
, sh
->sector
,
4807 rdev_dec_pending(rdev
, conf
->mddev
);
4812 raid_run_ops(sh
, s
.ops_request
);
4816 if (s
.dec_preread_active
) {
4817 /* We delay this until after ops_run_io so that if make_request
4818 * is waiting on a flush, it won't continue until the writes
4819 * have actually been submitted.
4821 atomic_dec(&conf
->preread_active_stripes
);
4822 if (atomic_read(&conf
->preread_active_stripes
) <
4824 md_wakeup_thread(conf
->mddev
->thread
);
4827 if (!bio_list_empty(&s
.return_bi
)) {
4828 if (test_bit(MD_SB_CHANGE_PENDING
, &conf
->mddev
->sb_flags
)) {
4829 spin_lock_irq(&conf
->device_lock
);
4830 bio_list_merge(&conf
->return_bi
, &s
.return_bi
);
4831 spin_unlock_irq(&conf
->device_lock
);
4832 md_wakeup_thread(conf
->mddev
->thread
);
4834 return_io(&s
.return_bi
);
4837 clear_bit_unlock(STRIPE_ACTIVE
, &sh
->state
);
4840 static void raid5_activate_delayed(struct r5conf
*conf
)
4842 if (atomic_read(&conf
->preread_active_stripes
) < IO_THRESHOLD
) {
4843 while (!list_empty(&conf
->delayed_list
)) {
4844 struct list_head
*l
= conf
->delayed_list
.next
;
4845 struct stripe_head
*sh
;
4846 sh
= list_entry(l
, struct stripe_head
, lru
);
4848 clear_bit(STRIPE_DELAYED
, &sh
->state
);
4849 if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE
, &sh
->state
))
4850 atomic_inc(&conf
->preread_active_stripes
);
4851 list_add_tail(&sh
->lru
, &conf
->hold_list
);
4852 raid5_wakeup_stripe_thread(sh
);
4857 static void activate_bit_delay(struct r5conf
*conf
,
4858 struct list_head
*temp_inactive_list
)
4860 /* device_lock is held */
4861 struct list_head head
;
4862 list_add(&head
, &conf
->bitmap_list
);
4863 list_del_init(&conf
->bitmap_list
);
4864 while (!list_empty(&head
)) {
4865 struct stripe_head
*sh
= list_entry(head
.next
, struct stripe_head
, lru
);
4867 list_del_init(&sh
->lru
);
4868 atomic_inc(&sh
->count
);
4869 hash
= sh
->hash_lock_index
;
4870 __release_stripe(conf
, sh
, &temp_inactive_list
[hash
]);
4874 static int raid5_congested(struct mddev
*mddev
, int bits
)
4876 struct r5conf
*conf
= mddev
->private;
4878 /* No difference between reads and writes. Just check
4879 * how busy the stripe_cache is
4882 if (test_bit(R5_INACTIVE_BLOCKED
, &conf
->cache_state
))
4885 /* Also checks whether there is pressure on r5cache log space */
4886 if (test_bit(R5C_LOG_TIGHT
, &conf
->cache_state
))
4890 if (atomic_read(&conf
->empty_inactive_list_nr
))
4896 static int in_chunk_boundary(struct mddev
*mddev
, struct bio
*bio
)
4898 struct r5conf
*conf
= mddev
->private;
4899 sector_t sector
= bio
->bi_iter
.bi_sector
+ get_start_sect(bio
->bi_bdev
);
4900 unsigned int chunk_sectors
;
4901 unsigned int bio_sectors
= bio_sectors(bio
);
4903 chunk_sectors
= min(conf
->chunk_sectors
, conf
->prev_chunk_sectors
);
4904 return chunk_sectors
>=
4905 ((sector
& (chunk_sectors
- 1)) + bio_sectors
);
4909 * add bio to the retry LIFO ( in O(1) ... we are in interrupt )
4910 * later sampled by raid5d.
4912 static void add_bio_to_retry(struct bio
*bi
,struct r5conf
*conf
)
4914 unsigned long flags
;
4916 spin_lock_irqsave(&conf
->device_lock
, flags
);
4918 bi
->bi_next
= conf
->retry_read_aligned_list
;
4919 conf
->retry_read_aligned_list
= bi
;
4921 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
4922 md_wakeup_thread(conf
->mddev
->thread
);
4925 static struct bio
*remove_bio_from_retry(struct r5conf
*conf
)
4929 bi
= conf
->retry_read_aligned
;
4931 conf
->retry_read_aligned
= NULL
;
4934 bi
= conf
->retry_read_aligned_list
;
4936 conf
->retry_read_aligned_list
= bi
->bi_next
;
4939 * this sets the active strip count to 1 and the processed
4940 * strip count to zero (upper 8 bits)
4942 raid5_set_bi_stripes(bi
, 1); /* biased count of active stripes */
4949 * The "raid5_align_endio" should check if the read succeeded and if it
4950 * did, call bio_endio on the original bio (having bio_put the new bio
4952 * If the read failed..
4954 static void raid5_align_endio(struct bio
*bi
)
4956 struct bio
* raid_bi
= bi
->bi_private
;
4957 struct mddev
*mddev
;
4958 struct r5conf
*conf
;
4959 struct md_rdev
*rdev
;
4960 int error
= bi
->bi_error
;
4964 rdev
= (void*)raid_bi
->bi_next
;
4965 raid_bi
->bi_next
= NULL
;
4966 mddev
= rdev
->mddev
;
4967 conf
= mddev
->private;
4969 rdev_dec_pending(rdev
, conf
->mddev
);
4972 trace_block_bio_complete(bdev_get_queue(raid_bi
->bi_bdev
),
4975 if (atomic_dec_and_test(&conf
->active_aligned_reads
))
4976 wake_up(&conf
->wait_for_quiescent
);
4980 pr_debug("raid5_align_endio : io error...handing IO for a retry\n");
4982 add_bio_to_retry(raid_bi
, conf
);
4985 static int raid5_read_one_chunk(struct mddev
*mddev
, struct bio
*raid_bio
)
4987 struct r5conf
*conf
= mddev
->private;
4989 struct bio
* align_bi
;
4990 struct md_rdev
*rdev
;
4991 sector_t end_sector
;
4993 if (!in_chunk_boundary(mddev
, raid_bio
)) {
4994 pr_debug("%s: non aligned\n", __func__
);
4998 * use bio_clone_mddev to make a copy of the bio
5000 align_bi
= bio_clone_mddev(raid_bio
, GFP_NOIO
, mddev
);
5004 * set bi_end_io to a new function, and set bi_private to the
5007 align_bi
->bi_end_io
= raid5_align_endio
;
5008 align_bi
->bi_private
= raid_bio
;
5012 align_bi
->bi_iter
.bi_sector
=
5013 raid5_compute_sector(conf
, raid_bio
->bi_iter
.bi_sector
,
5016 end_sector
= bio_end_sector(align_bi
);
5018 rdev
= rcu_dereference(conf
->disks
[dd_idx
].replacement
);
5019 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
) ||
5020 rdev
->recovery_offset
< end_sector
) {
5021 rdev
= rcu_dereference(conf
->disks
[dd_idx
].rdev
);
5023 (test_bit(Faulty
, &rdev
->flags
) ||
5024 !(test_bit(In_sync
, &rdev
->flags
) ||
5025 rdev
->recovery_offset
>= end_sector
)))
5032 atomic_inc(&rdev
->nr_pending
);
5034 raid_bio
->bi_next
= (void*)rdev
;
5035 align_bi
->bi_bdev
= rdev
->bdev
;
5036 bio_clear_flag(align_bi
, BIO_SEG_VALID
);
5038 if (is_badblock(rdev
, align_bi
->bi_iter
.bi_sector
,
5039 bio_sectors(align_bi
),
5040 &first_bad
, &bad_sectors
)) {
5042 rdev_dec_pending(rdev
, mddev
);
5046 /* No reshape active, so we can trust rdev->data_offset */
5047 align_bi
->bi_iter
.bi_sector
+= rdev
->data_offset
;
5049 spin_lock_irq(&conf
->device_lock
);
5050 wait_event_lock_irq(conf
->wait_for_quiescent
,
5053 atomic_inc(&conf
->active_aligned_reads
);
5054 spin_unlock_irq(&conf
->device_lock
);
5057 trace_block_bio_remap(bdev_get_queue(align_bi
->bi_bdev
),
5058 align_bi
, disk_devt(mddev
->gendisk
),
5059 raid_bio
->bi_iter
.bi_sector
);
5060 generic_make_request(align_bi
);
5069 static struct bio
*chunk_aligned_read(struct mddev
*mddev
, struct bio
*raid_bio
)
5074 sector_t sector
= raid_bio
->bi_iter
.bi_sector
;
5075 unsigned chunk_sects
= mddev
->chunk_sectors
;
5076 unsigned sectors
= chunk_sects
- (sector
& (chunk_sects
-1));
5078 if (sectors
< bio_sectors(raid_bio
)) {
5079 split
= bio_split(raid_bio
, sectors
, GFP_NOIO
, fs_bio_set
);
5080 bio_chain(split
, raid_bio
);
5084 if (!raid5_read_one_chunk(mddev
, split
)) {
5085 if (split
!= raid_bio
)
5086 generic_make_request(raid_bio
);
5089 } while (split
!= raid_bio
);
5094 /* __get_priority_stripe - get the next stripe to process
5096 * Full stripe writes are allowed to pass preread active stripes up until
5097 * the bypass_threshold is exceeded. In general the bypass_count
5098 * increments when the handle_list is handled before the hold_list; however, it
5099 * will not be incremented when STRIPE_IO_STARTED is sampled set signifying a
5100 * stripe with in flight i/o. The bypass_count will be reset when the
5101 * head of the hold_list has changed, i.e. the head was promoted to the
5104 static struct stripe_head
*__get_priority_stripe(struct r5conf
*conf
, int group
)
5106 struct stripe_head
*sh
= NULL
, *tmp
;
5107 struct list_head
*handle_list
= NULL
;
5108 struct r5worker_group
*wg
= NULL
;
5110 if (conf
->worker_cnt_per_group
== 0) {
5111 handle_list
= &conf
->handle_list
;
5112 } else if (group
!= ANY_GROUP
) {
5113 handle_list
= &conf
->worker_groups
[group
].handle_list
;
5114 wg
= &conf
->worker_groups
[group
];
5117 for (i
= 0; i
< conf
->group_cnt
; i
++) {
5118 handle_list
= &conf
->worker_groups
[i
].handle_list
;
5119 wg
= &conf
->worker_groups
[i
];
5120 if (!list_empty(handle_list
))
5125 pr_debug("%s: handle: %s hold: %s full_writes: %d bypass_count: %d\n",
5127 list_empty(handle_list
) ? "empty" : "busy",
5128 list_empty(&conf
->hold_list
) ? "empty" : "busy",
5129 atomic_read(&conf
->pending_full_writes
), conf
->bypass_count
);
5131 if (!list_empty(handle_list
)) {
5132 sh
= list_entry(handle_list
->next
, typeof(*sh
), lru
);
5134 if (list_empty(&conf
->hold_list
))
5135 conf
->bypass_count
= 0;
5136 else if (!test_bit(STRIPE_IO_STARTED
, &sh
->state
)) {
5137 if (conf
->hold_list
.next
== conf
->last_hold
)
5138 conf
->bypass_count
++;
5140 conf
->last_hold
= conf
->hold_list
.next
;
5141 conf
->bypass_count
-= conf
->bypass_threshold
;
5142 if (conf
->bypass_count
< 0)
5143 conf
->bypass_count
= 0;
5146 } else if (!list_empty(&conf
->hold_list
) &&
5147 ((conf
->bypass_threshold
&&
5148 conf
->bypass_count
> conf
->bypass_threshold
) ||
5149 atomic_read(&conf
->pending_full_writes
) == 0)) {
5151 list_for_each_entry(tmp
, &conf
->hold_list
, lru
) {
5152 if (conf
->worker_cnt_per_group
== 0 ||
5153 group
== ANY_GROUP
||
5154 !cpu_online(tmp
->cpu
) ||
5155 cpu_to_group(tmp
->cpu
) == group
) {
5162 conf
->bypass_count
-= conf
->bypass_threshold
;
5163 if (conf
->bypass_count
< 0)
5164 conf
->bypass_count
= 0;
5176 list_del_init(&sh
->lru
);
5177 BUG_ON(atomic_inc_return(&sh
->count
) != 1);
5181 struct raid5_plug_cb
{
5182 struct blk_plug_cb cb
;
5183 struct list_head list
;
5184 struct list_head temp_inactive_list
[NR_STRIPE_HASH_LOCKS
];
5187 static void raid5_unplug(struct blk_plug_cb
*blk_cb
, bool from_schedule
)
5189 struct raid5_plug_cb
*cb
= container_of(
5190 blk_cb
, struct raid5_plug_cb
, cb
);
5191 struct stripe_head
*sh
;
5192 struct mddev
*mddev
= cb
->cb
.data
;
5193 struct r5conf
*conf
= mddev
->private;
5197 if (cb
->list
.next
&& !list_empty(&cb
->list
)) {
5198 spin_lock_irq(&conf
->device_lock
);
5199 while (!list_empty(&cb
->list
)) {
5200 sh
= list_first_entry(&cb
->list
, struct stripe_head
, lru
);
5201 list_del_init(&sh
->lru
);
5203 * avoid race release_stripe_plug() sees
5204 * STRIPE_ON_UNPLUG_LIST clear but the stripe
5205 * is still in our list
5207 smp_mb__before_atomic();
5208 clear_bit(STRIPE_ON_UNPLUG_LIST
, &sh
->state
);
5210 * STRIPE_ON_RELEASE_LIST could be set here. In that
5211 * case, the count is always > 1 here
5213 hash
= sh
->hash_lock_index
;
5214 __release_stripe(conf
, sh
, &cb
->temp_inactive_list
[hash
]);
5217 spin_unlock_irq(&conf
->device_lock
);
5219 release_inactive_stripe_list(conf
, cb
->temp_inactive_list
,
5220 NR_STRIPE_HASH_LOCKS
);
5222 trace_block_unplug(mddev
->queue
, cnt
, !from_schedule
);
5226 static void release_stripe_plug(struct mddev
*mddev
,
5227 struct stripe_head
*sh
)
5229 struct blk_plug_cb
*blk_cb
= blk_check_plugged(
5230 raid5_unplug
, mddev
,
5231 sizeof(struct raid5_plug_cb
));
5232 struct raid5_plug_cb
*cb
;
5235 raid5_release_stripe(sh
);
5239 cb
= container_of(blk_cb
, struct raid5_plug_cb
, cb
);
5241 if (cb
->list
.next
== NULL
) {
5243 INIT_LIST_HEAD(&cb
->list
);
5244 for (i
= 0; i
< NR_STRIPE_HASH_LOCKS
; i
++)
5245 INIT_LIST_HEAD(cb
->temp_inactive_list
+ i
);
5248 if (!test_and_set_bit(STRIPE_ON_UNPLUG_LIST
, &sh
->state
))
5249 list_add_tail(&sh
->lru
, &cb
->list
);
5251 raid5_release_stripe(sh
);
5254 static void make_discard_request(struct mddev
*mddev
, struct bio
*bi
)
5256 struct r5conf
*conf
= mddev
->private;
5257 sector_t logical_sector
, last_sector
;
5258 struct stripe_head
*sh
;
5262 if (mddev
->reshape_position
!= MaxSector
)
5263 /* Skip discard while reshape is happening */
5266 logical_sector
= bi
->bi_iter
.bi_sector
& ~((sector_t
)STRIPE_SECTORS
-1);
5267 last_sector
= bi
->bi_iter
.bi_sector
+ (bi
->bi_iter
.bi_size
>>9);
5270 bi
->bi_phys_segments
= 1; /* over-loaded to count active stripes */
5272 stripe_sectors
= conf
->chunk_sectors
*
5273 (conf
->raid_disks
- conf
->max_degraded
);
5274 logical_sector
= DIV_ROUND_UP_SECTOR_T(logical_sector
,
5276 sector_div(last_sector
, stripe_sectors
);
5278 logical_sector
*= conf
->chunk_sectors
;
5279 last_sector
*= conf
->chunk_sectors
;
5281 for (; logical_sector
< last_sector
;
5282 logical_sector
+= STRIPE_SECTORS
) {
5286 sh
= raid5_get_active_stripe(conf
, logical_sector
, 0, 0, 0);
5287 prepare_to_wait(&conf
->wait_for_overlap
, &w
,
5288 TASK_UNINTERRUPTIBLE
);
5289 set_bit(R5_Overlap
, &sh
->dev
[sh
->pd_idx
].flags
);
5290 if (test_bit(STRIPE_SYNCING
, &sh
->state
)) {
5291 raid5_release_stripe(sh
);
5295 clear_bit(R5_Overlap
, &sh
->dev
[sh
->pd_idx
].flags
);
5296 spin_lock_irq(&sh
->stripe_lock
);
5297 for (d
= 0; d
< conf
->raid_disks
; d
++) {
5298 if (d
== sh
->pd_idx
|| d
== sh
->qd_idx
)
5300 if (sh
->dev
[d
].towrite
|| sh
->dev
[d
].toread
) {
5301 set_bit(R5_Overlap
, &sh
->dev
[d
].flags
);
5302 spin_unlock_irq(&sh
->stripe_lock
);
5303 raid5_release_stripe(sh
);
5308 set_bit(STRIPE_DISCARD
, &sh
->state
);
5309 finish_wait(&conf
->wait_for_overlap
, &w
);
5310 sh
->overwrite_disks
= 0;
5311 for (d
= 0; d
< conf
->raid_disks
; d
++) {
5312 if (d
== sh
->pd_idx
|| d
== sh
->qd_idx
)
5314 sh
->dev
[d
].towrite
= bi
;
5315 set_bit(R5_OVERWRITE
, &sh
->dev
[d
].flags
);
5316 raid5_inc_bi_active_stripes(bi
);
5317 sh
->overwrite_disks
++;
5319 spin_unlock_irq(&sh
->stripe_lock
);
5320 if (conf
->mddev
->bitmap
) {
5322 d
< conf
->raid_disks
- conf
->max_degraded
;
5324 bitmap_startwrite(mddev
->bitmap
,
5328 sh
->bm_seq
= conf
->seq_flush
+ 1;
5329 set_bit(STRIPE_BIT_DELAY
, &sh
->state
);
5332 set_bit(STRIPE_HANDLE
, &sh
->state
);
5333 clear_bit(STRIPE_DELAYED
, &sh
->state
);
5334 if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE
, &sh
->state
))
5335 atomic_inc(&conf
->preread_active_stripes
);
5336 release_stripe_plug(mddev
, sh
);
5339 remaining
= raid5_dec_bi_active_stripes(bi
);
5340 if (remaining
== 0) {
5341 md_write_end(mddev
);
5346 static void raid5_make_request(struct mddev
*mddev
, struct bio
* bi
)
5348 struct r5conf
*conf
= mddev
->private;
5350 sector_t new_sector
;
5351 sector_t logical_sector
, last_sector
;
5352 struct stripe_head
*sh
;
5353 const int rw
= bio_data_dir(bi
);
5357 bool do_flush
= false;
5359 if (unlikely(bi
->bi_opf
& REQ_PREFLUSH
)) {
5360 int ret
= r5l_handle_flush_request(conf
->log
, bi
);
5364 if (ret
== -ENODEV
) {
5365 md_flush_request(mddev
, bi
);
5368 /* ret == -EAGAIN, fallback */
5370 * if r5l_handle_flush_request() didn't clear REQ_PREFLUSH,
5371 * we need to flush journal device
5373 do_flush
= bi
->bi_opf
& REQ_PREFLUSH
;
5376 md_write_start(mddev
, bi
);
5379 * If array is degraded, better not do chunk aligned read because
5380 * later we might have to read it again in order to reconstruct
5381 * data on failed drives.
5383 if (rw
== READ
&& mddev
->degraded
== 0 &&
5384 !r5c_is_writeback(conf
->log
) &&
5385 mddev
->reshape_position
== MaxSector
) {
5386 bi
= chunk_aligned_read(mddev
, bi
);
5391 if (unlikely(bio_op(bi
) == REQ_OP_DISCARD
)) {
5392 make_discard_request(mddev
, bi
);
5396 logical_sector
= bi
->bi_iter
.bi_sector
& ~((sector_t
)STRIPE_SECTORS
-1);
5397 last_sector
= bio_end_sector(bi
);
5399 bi
->bi_phys_segments
= 1; /* over-loaded to count active stripes */
5401 prepare_to_wait(&conf
->wait_for_overlap
, &w
, TASK_UNINTERRUPTIBLE
);
5402 for (;logical_sector
< last_sector
; logical_sector
+= STRIPE_SECTORS
) {
5408 seq
= read_seqcount_begin(&conf
->gen_lock
);
5411 prepare_to_wait(&conf
->wait_for_overlap
, &w
,
5412 TASK_UNINTERRUPTIBLE
);
5413 if (unlikely(conf
->reshape_progress
!= MaxSector
)) {
5414 /* spinlock is needed as reshape_progress may be
5415 * 64bit on a 32bit platform, and so it might be
5416 * possible to see a half-updated value
5417 * Of course reshape_progress could change after
5418 * the lock is dropped, so once we get a reference
5419 * to the stripe that we think it is, we will have
5422 spin_lock_irq(&conf
->device_lock
);
5423 if (mddev
->reshape_backwards
5424 ? logical_sector
< conf
->reshape_progress
5425 : logical_sector
>= conf
->reshape_progress
) {
5428 if (mddev
->reshape_backwards
5429 ? logical_sector
< conf
->reshape_safe
5430 : logical_sector
>= conf
->reshape_safe
) {
5431 spin_unlock_irq(&conf
->device_lock
);
5437 spin_unlock_irq(&conf
->device_lock
);
5440 new_sector
= raid5_compute_sector(conf
, logical_sector
,
5443 pr_debug("raid456: raid5_make_request, sector %llu logical %llu\n",
5444 (unsigned long long)new_sector
,
5445 (unsigned long long)logical_sector
);
5447 sh
= raid5_get_active_stripe(conf
, new_sector
, previous
,
5448 (bi
->bi_opf
& REQ_RAHEAD
), 0);
5450 if (unlikely(previous
)) {
5451 /* expansion might have moved on while waiting for a
5452 * stripe, so we must do the range check again.
5453 * Expansion could still move past after this
5454 * test, but as we are holding a reference to
5455 * 'sh', we know that if that happens,
5456 * STRIPE_EXPANDING will get set and the expansion
5457 * won't proceed until we finish with the stripe.
5460 spin_lock_irq(&conf
->device_lock
);
5461 if (mddev
->reshape_backwards
5462 ? logical_sector
>= conf
->reshape_progress
5463 : logical_sector
< conf
->reshape_progress
)
5464 /* mismatch, need to try again */
5466 spin_unlock_irq(&conf
->device_lock
);
5468 raid5_release_stripe(sh
);
5474 if (read_seqcount_retry(&conf
->gen_lock
, seq
)) {
5475 /* Might have got the wrong stripe_head
5478 raid5_release_stripe(sh
);
5483 logical_sector
>= mddev
->suspend_lo
&&
5484 logical_sector
< mddev
->suspend_hi
) {
5485 raid5_release_stripe(sh
);
5486 /* As the suspend_* range is controlled by
5487 * userspace, we want an interruptible
5490 flush_signals(current
);
5491 prepare_to_wait(&conf
->wait_for_overlap
,
5492 &w
, TASK_INTERRUPTIBLE
);
5493 if (logical_sector
>= mddev
->suspend_lo
&&
5494 logical_sector
< mddev
->suspend_hi
) {
5501 if (test_bit(STRIPE_EXPANDING
, &sh
->state
) ||
5502 !add_stripe_bio(sh
, bi
, dd_idx
, rw
, previous
)) {
5503 /* Stripe is busy expanding or
5504 * add failed due to overlap. Flush everything
5507 md_wakeup_thread(mddev
->thread
);
5508 raid5_release_stripe(sh
);
5514 set_bit(STRIPE_R5C_PREFLUSH
, &sh
->state
);
5515 /* we only need flush for one stripe */
5519 set_bit(STRIPE_HANDLE
, &sh
->state
);
5520 clear_bit(STRIPE_DELAYED
, &sh
->state
);
5521 if ((!sh
->batch_head
|| sh
== sh
->batch_head
) &&
5522 (bi
->bi_opf
& REQ_SYNC
) &&
5523 !test_and_set_bit(STRIPE_PREREAD_ACTIVE
, &sh
->state
))
5524 atomic_inc(&conf
->preread_active_stripes
);
5525 release_stripe_plug(mddev
, sh
);
5527 /* cannot get stripe for read-ahead, just give-up */
5528 bi
->bi_error
= -EIO
;
5532 finish_wait(&conf
->wait_for_overlap
, &w
);
5534 remaining
= raid5_dec_bi_active_stripes(bi
);
5535 if (remaining
== 0) {
5538 md_write_end(mddev
);
5540 trace_block_bio_complete(bdev_get_queue(bi
->bi_bdev
),
5546 static sector_t
raid5_size(struct mddev
*mddev
, sector_t sectors
, int raid_disks
);
5548 static sector_t
reshape_request(struct mddev
*mddev
, sector_t sector_nr
, int *skipped
)
5550 /* reshaping is quite different to recovery/resync so it is
5551 * handled quite separately ... here.
5553 * On each call to sync_request, we gather one chunk worth of
5554 * destination stripes and flag them as expanding.
5555 * Then we find all the source stripes and request reads.
5556 * As the reads complete, handle_stripe will copy the data
5557 * into the destination stripe and release that stripe.
5559 struct r5conf
*conf
= mddev
->private;
5560 struct stripe_head
*sh
;
5561 sector_t first_sector
, last_sector
;
5562 int raid_disks
= conf
->previous_raid_disks
;
5563 int data_disks
= raid_disks
- conf
->max_degraded
;
5564 int new_data_disks
= conf
->raid_disks
- conf
->max_degraded
;
5567 sector_t writepos
, readpos
, safepos
;
5568 sector_t stripe_addr
;
5569 int reshape_sectors
;
5570 struct list_head stripes
;
5573 if (sector_nr
== 0) {
5574 /* If restarting in the middle, skip the initial sectors */
5575 if (mddev
->reshape_backwards
&&
5576 conf
->reshape_progress
< raid5_size(mddev
, 0, 0)) {
5577 sector_nr
= raid5_size(mddev
, 0, 0)
5578 - conf
->reshape_progress
;
5579 } else if (mddev
->reshape_backwards
&&
5580 conf
->reshape_progress
== MaxSector
) {
5581 /* shouldn't happen, but just in case, finish up.*/
5582 sector_nr
= MaxSector
;
5583 } else if (!mddev
->reshape_backwards
&&
5584 conf
->reshape_progress
> 0)
5585 sector_nr
= conf
->reshape_progress
;
5586 sector_div(sector_nr
, new_data_disks
);
5588 mddev
->curr_resync_completed
= sector_nr
;
5589 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
5596 /* We need to process a full chunk at a time.
5597 * If old and new chunk sizes differ, we need to process the
5601 reshape_sectors
= max(conf
->chunk_sectors
, conf
->prev_chunk_sectors
);
5603 /* We update the metadata at least every 10 seconds, or when
5604 * the data about to be copied would over-write the source of
5605 * the data at the front of the range. i.e. one new_stripe
5606 * along from reshape_progress new_maps to after where
5607 * reshape_safe old_maps to
5609 writepos
= conf
->reshape_progress
;
5610 sector_div(writepos
, new_data_disks
);
5611 readpos
= conf
->reshape_progress
;
5612 sector_div(readpos
, data_disks
);
5613 safepos
= conf
->reshape_safe
;
5614 sector_div(safepos
, data_disks
);
5615 if (mddev
->reshape_backwards
) {
5616 BUG_ON(writepos
< reshape_sectors
);
5617 writepos
-= reshape_sectors
;
5618 readpos
+= reshape_sectors
;
5619 safepos
+= reshape_sectors
;
5621 writepos
+= reshape_sectors
;
5622 /* readpos and safepos are worst-case calculations.
5623 * A negative number is overly pessimistic, and causes
5624 * obvious problems for unsigned storage. So clip to 0.
5626 readpos
-= min_t(sector_t
, reshape_sectors
, readpos
);
5627 safepos
-= min_t(sector_t
, reshape_sectors
, safepos
);
5630 /* Having calculated the 'writepos' possibly use it
5631 * to set 'stripe_addr' which is where we will write to.
5633 if (mddev
->reshape_backwards
) {
5634 BUG_ON(conf
->reshape_progress
== 0);
5635 stripe_addr
= writepos
;
5636 BUG_ON((mddev
->dev_sectors
&
5637 ~((sector_t
)reshape_sectors
- 1))
5638 - reshape_sectors
- stripe_addr
5641 BUG_ON(writepos
!= sector_nr
+ reshape_sectors
);
5642 stripe_addr
= sector_nr
;
5645 /* 'writepos' is the most advanced device address we might write.
5646 * 'readpos' is the least advanced device address we might read.
5647 * 'safepos' is the least address recorded in the metadata as having
5649 * If there is a min_offset_diff, these are adjusted either by
5650 * increasing the safepos/readpos if diff is negative, or
5651 * increasing writepos if diff is positive.
5652 * If 'readpos' is then behind 'writepos', there is no way that we can
5653 * ensure safety in the face of a crash - that must be done by userspace
5654 * making a backup of the data. So in that case there is no particular
5655 * rush to update metadata.
5656 * Otherwise if 'safepos' is behind 'writepos', then we really need to
5657 * update the metadata to advance 'safepos' to match 'readpos' so that
5658 * we can be safe in the event of a crash.
5659 * So we insist on updating metadata if safepos is behind writepos and
5660 * readpos is beyond writepos.
5661 * In any case, update the metadata every 10 seconds.
5662 * Maybe that number should be configurable, but I'm not sure it is
5663 * worth it.... maybe it could be a multiple of safemode_delay???
5665 if (conf
->min_offset_diff
< 0) {
5666 safepos
+= -conf
->min_offset_diff
;
5667 readpos
+= -conf
->min_offset_diff
;
5669 writepos
+= conf
->min_offset_diff
;
5671 if ((mddev
->reshape_backwards
5672 ? (safepos
> writepos
&& readpos
< writepos
)
5673 : (safepos
< writepos
&& readpos
> writepos
)) ||
5674 time_after(jiffies
, conf
->reshape_checkpoint
+ 10*HZ
)) {
5675 /* Cannot proceed until we've updated the superblock... */
5676 wait_event(conf
->wait_for_overlap
,
5677 atomic_read(&conf
->reshape_stripes
)==0
5678 || test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
));
5679 if (atomic_read(&conf
->reshape_stripes
) != 0)
5681 mddev
->reshape_position
= conf
->reshape_progress
;
5682 mddev
->curr_resync_completed
= sector_nr
;
5683 conf
->reshape_checkpoint
= jiffies
;
5684 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
5685 md_wakeup_thread(mddev
->thread
);
5686 wait_event(mddev
->sb_wait
, mddev
->sb_flags
== 0 ||
5687 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
));
5688 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5690 spin_lock_irq(&conf
->device_lock
);
5691 conf
->reshape_safe
= mddev
->reshape_position
;
5692 spin_unlock_irq(&conf
->device_lock
);
5693 wake_up(&conf
->wait_for_overlap
);
5694 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
5697 INIT_LIST_HEAD(&stripes
);
5698 for (i
= 0; i
< reshape_sectors
; i
+= STRIPE_SECTORS
) {
5700 int skipped_disk
= 0;
5701 sh
= raid5_get_active_stripe(conf
, stripe_addr
+i
, 0, 0, 1);
5702 set_bit(STRIPE_EXPANDING
, &sh
->state
);
5703 atomic_inc(&conf
->reshape_stripes
);
5704 /* If any of this stripe is beyond the end of the old
5705 * array, then we need to zero those blocks
5707 for (j
=sh
->disks
; j
--;) {
5709 if (j
== sh
->pd_idx
)
5711 if (conf
->level
== 6 &&
5714 s
= raid5_compute_blocknr(sh
, j
, 0);
5715 if (s
< raid5_size(mddev
, 0, 0)) {
5719 memset(page_address(sh
->dev
[j
].page
), 0, STRIPE_SIZE
);
5720 set_bit(R5_Expanded
, &sh
->dev
[j
].flags
);
5721 set_bit(R5_UPTODATE
, &sh
->dev
[j
].flags
);
5723 if (!skipped_disk
) {
5724 set_bit(STRIPE_EXPAND_READY
, &sh
->state
);
5725 set_bit(STRIPE_HANDLE
, &sh
->state
);
5727 list_add(&sh
->lru
, &stripes
);
5729 spin_lock_irq(&conf
->device_lock
);
5730 if (mddev
->reshape_backwards
)
5731 conf
->reshape_progress
-= reshape_sectors
* new_data_disks
;
5733 conf
->reshape_progress
+= reshape_sectors
* new_data_disks
;
5734 spin_unlock_irq(&conf
->device_lock
);
5735 /* Ok, those stripe are ready. We can start scheduling
5736 * reads on the source stripes.
5737 * The source stripes are determined by mapping the first and last
5738 * block on the destination stripes.
5741 raid5_compute_sector(conf
, stripe_addr
*(new_data_disks
),
5744 raid5_compute_sector(conf
, ((stripe_addr
+reshape_sectors
)
5745 * new_data_disks
- 1),
5747 if (last_sector
>= mddev
->dev_sectors
)
5748 last_sector
= mddev
->dev_sectors
- 1;
5749 while (first_sector
<= last_sector
) {
5750 sh
= raid5_get_active_stripe(conf
, first_sector
, 1, 0, 1);
5751 set_bit(STRIPE_EXPAND_SOURCE
, &sh
->state
);
5752 set_bit(STRIPE_HANDLE
, &sh
->state
);
5753 raid5_release_stripe(sh
);
5754 first_sector
+= STRIPE_SECTORS
;
5756 /* Now that the sources are clearly marked, we can release
5757 * the destination stripes
5759 while (!list_empty(&stripes
)) {
5760 sh
= list_entry(stripes
.next
, struct stripe_head
, lru
);
5761 list_del_init(&sh
->lru
);
5762 raid5_release_stripe(sh
);
5764 /* If this takes us to the resync_max point where we have to pause,
5765 * then we need to write out the superblock.
5767 sector_nr
+= reshape_sectors
;
5768 retn
= reshape_sectors
;
5770 if (mddev
->curr_resync_completed
> mddev
->resync_max
||
5771 (sector_nr
- mddev
->curr_resync_completed
) * 2
5772 >= mddev
->resync_max
- mddev
->curr_resync_completed
) {
5773 /* Cannot proceed until we've updated the superblock... */
5774 wait_event(conf
->wait_for_overlap
,
5775 atomic_read(&conf
->reshape_stripes
) == 0
5776 || test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
));
5777 if (atomic_read(&conf
->reshape_stripes
) != 0)
5779 mddev
->reshape_position
= conf
->reshape_progress
;
5780 mddev
->curr_resync_completed
= sector_nr
;
5781 conf
->reshape_checkpoint
= jiffies
;
5782 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
5783 md_wakeup_thread(mddev
->thread
);
5784 wait_event(mddev
->sb_wait
,
5785 !test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
)
5786 || test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
));
5787 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5789 spin_lock_irq(&conf
->device_lock
);
5790 conf
->reshape_safe
= mddev
->reshape_position
;
5791 spin_unlock_irq(&conf
->device_lock
);
5792 wake_up(&conf
->wait_for_overlap
);
5793 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
5799 static inline sector_t
raid5_sync_request(struct mddev
*mddev
, sector_t sector_nr
,
5802 struct r5conf
*conf
= mddev
->private;
5803 struct stripe_head
*sh
;
5804 sector_t max_sector
= mddev
->dev_sectors
;
5805 sector_t sync_blocks
;
5806 int still_degraded
= 0;
5809 if (sector_nr
>= max_sector
) {
5810 /* just being told to finish up .. nothing much to do */
5812 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)) {
5817 if (mddev
->curr_resync
< max_sector
) /* aborted */
5818 bitmap_end_sync(mddev
->bitmap
, mddev
->curr_resync
,
5820 else /* completed sync */
5822 bitmap_close_sync(mddev
->bitmap
);
5827 /* Allow raid5_quiesce to complete */
5828 wait_event(conf
->wait_for_overlap
, conf
->quiesce
!= 2);
5830 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5831 return reshape_request(mddev
, sector_nr
, skipped
);
5833 /* No need to check resync_max as we never do more than one
5834 * stripe, and as resync_max will always be on a chunk boundary,
5835 * if the check in md_do_sync didn't fire, there is no chance
5836 * of overstepping resync_max here
5839 /* if there is too many failed drives and we are trying
5840 * to resync, then assert that we are finished, because there is
5841 * nothing we can do.
5843 if (mddev
->degraded
>= conf
->max_degraded
&&
5844 test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5845 sector_t rv
= mddev
->dev_sectors
- sector_nr
;
5849 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
) &&
5851 !bitmap_start_sync(mddev
->bitmap
, sector_nr
, &sync_blocks
, 1) &&
5852 sync_blocks
>= STRIPE_SECTORS
) {
5853 /* we can skip this block, and probably more */
5854 sync_blocks
/= STRIPE_SECTORS
;
5856 return sync_blocks
* STRIPE_SECTORS
; /* keep things rounded to whole stripes */
5859 bitmap_cond_end_sync(mddev
->bitmap
, sector_nr
, false);
5861 sh
= raid5_get_active_stripe(conf
, sector_nr
, 0, 1, 0);
5863 sh
= raid5_get_active_stripe(conf
, sector_nr
, 0, 0, 0);
5864 /* make sure we don't swamp the stripe cache if someone else
5865 * is trying to get access
5867 schedule_timeout_uninterruptible(1);
5869 /* Need to check if array will still be degraded after recovery/resync
5870 * Note in case of > 1 drive failures it's possible we're rebuilding
5871 * one drive while leaving another faulty drive in array.
5874 for (i
= 0; i
< conf
->raid_disks
; i
++) {
5875 struct md_rdev
*rdev
= ACCESS_ONCE(conf
->disks
[i
].rdev
);
5877 if (rdev
== NULL
|| test_bit(Faulty
, &rdev
->flags
))
5882 bitmap_start_sync(mddev
->bitmap
, sector_nr
, &sync_blocks
, still_degraded
);
5884 set_bit(STRIPE_SYNC_REQUESTED
, &sh
->state
);
5885 set_bit(STRIPE_HANDLE
, &sh
->state
);
5887 raid5_release_stripe(sh
);
5889 return STRIPE_SECTORS
;
5892 static int retry_aligned_read(struct r5conf
*conf
, struct bio
*raid_bio
)
5894 /* We may not be able to submit a whole bio at once as there
5895 * may not be enough stripe_heads available.
5896 * We cannot pre-allocate enough stripe_heads as we may need
5897 * more than exist in the cache (if we allow ever large chunks).
5898 * So we do one stripe head at a time and record in
5899 * ->bi_hw_segments how many have been done.
5901 * We *know* that this entire raid_bio is in one chunk, so
5902 * it will be only one 'dd_idx' and only need one call to raid5_compute_sector.
5904 struct stripe_head
*sh
;
5906 sector_t sector
, logical_sector
, last_sector
;
5911 logical_sector
= raid_bio
->bi_iter
.bi_sector
&
5912 ~((sector_t
)STRIPE_SECTORS
-1);
5913 sector
= raid5_compute_sector(conf
, logical_sector
,
5915 last_sector
= bio_end_sector(raid_bio
);
5917 for (; logical_sector
< last_sector
;
5918 logical_sector
+= STRIPE_SECTORS
,
5919 sector
+= STRIPE_SECTORS
,
5922 if (scnt
< raid5_bi_processed_stripes(raid_bio
))
5923 /* already done this stripe */
5926 sh
= raid5_get_active_stripe(conf
, sector
, 0, 1, 1);
5929 /* failed to get a stripe - must wait */
5930 raid5_set_bi_processed_stripes(raid_bio
, scnt
);
5931 conf
->retry_read_aligned
= raid_bio
;
5935 if (!add_stripe_bio(sh
, raid_bio
, dd_idx
, 0, 0)) {
5936 raid5_release_stripe(sh
);
5937 raid5_set_bi_processed_stripes(raid_bio
, scnt
);
5938 conf
->retry_read_aligned
= raid_bio
;
5942 set_bit(R5_ReadNoMerge
, &sh
->dev
[dd_idx
].flags
);
5944 raid5_release_stripe(sh
);
5947 remaining
= raid5_dec_bi_active_stripes(raid_bio
);
5948 if (remaining
== 0) {
5949 trace_block_bio_complete(bdev_get_queue(raid_bio
->bi_bdev
),
5951 bio_endio(raid_bio
);
5953 if (atomic_dec_and_test(&conf
->active_aligned_reads
))
5954 wake_up(&conf
->wait_for_quiescent
);
5958 static int handle_active_stripes(struct r5conf
*conf
, int group
,
5959 struct r5worker
*worker
,
5960 struct list_head
*temp_inactive_list
)
5962 struct stripe_head
*batch
[MAX_STRIPE_BATCH
], *sh
;
5963 int i
, batch_size
= 0, hash
;
5964 bool release_inactive
= false;
5966 while (batch_size
< MAX_STRIPE_BATCH
&&
5967 (sh
= __get_priority_stripe(conf
, group
)) != NULL
)
5968 batch
[batch_size
++] = sh
;
5970 if (batch_size
== 0) {
5971 for (i
= 0; i
< NR_STRIPE_HASH_LOCKS
; i
++)
5972 if (!list_empty(temp_inactive_list
+ i
))
5974 if (i
== NR_STRIPE_HASH_LOCKS
) {
5975 spin_unlock_irq(&conf
->device_lock
);
5976 r5l_flush_stripe_to_raid(conf
->log
);
5977 spin_lock_irq(&conf
->device_lock
);
5980 release_inactive
= true;
5982 spin_unlock_irq(&conf
->device_lock
);
5984 release_inactive_stripe_list(conf
, temp_inactive_list
,
5985 NR_STRIPE_HASH_LOCKS
);
5987 r5l_flush_stripe_to_raid(conf
->log
);
5988 if (release_inactive
) {
5989 spin_lock_irq(&conf
->device_lock
);
5993 for (i
= 0; i
< batch_size
; i
++)
5994 handle_stripe(batch
[i
]);
5995 r5l_write_stripe_run(conf
->log
);
5999 spin_lock_irq(&conf
->device_lock
);
6000 for (i
= 0; i
< batch_size
; i
++) {
6001 hash
= batch
[i
]->hash_lock_index
;
6002 __release_stripe(conf
, batch
[i
], &temp_inactive_list
[hash
]);
6007 static void raid5_do_work(struct work_struct
*work
)
6009 struct r5worker
*worker
= container_of(work
, struct r5worker
, work
);
6010 struct r5worker_group
*group
= worker
->group
;
6011 struct r5conf
*conf
= group
->conf
;
6012 int group_id
= group
- conf
->worker_groups
;
6014 struct blk_plug plug
;
6016 pr_debug("+++ raid5worker active\n");
6018 blk_start_plug(&plug
);
6020 spin_lock_irq(&conf
->device_lock
);
6022 int batch_size
, released
;
6024 released
= release_stripe_list(conf
, worker
->temp_inactive_list
);
6026 batch_size
= handle_active_stripes(conf
, group_id
, worker
,
6027 worker
->temp_inactive_list
);
6028 worker
->working
= false;
6029 if (!batch_size
&& !released
)
6031 handled
+= batch_size
;
6033 pr_debug("%d stripes handled\n", handled
);
6035 spin_unlock_irq(&conf
->device_lock
);
6036 blk_finish_plug(&plug
);
6038 pr_debug("--- raid5worker inactive\n");
6042 * This is our raid5 kernel thread.
6044 * We scan the hash table for stripes which can be handled now.
6045 * During the scan, completed stripes are saved for us by the interrupt
6046 * handler, so that they will not have to wait for our next wakeup.
6048 static void raid5d(struct md_thread
*thread
)
6050 struct mddev
*mddev
= thread
->mddev
;
6051 struct r5conf
*conf
= mddev
->private;
6053 struct blk_plug plug
;
6055 pr_debug("+++ raid5d active\n");
6057 md_check_recovery(mddev
);
6059 if (!bio_list_empty(&conf
->return_bi
) &&
6060 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
)) {
6061 struct bio_list tmp
= BIO_EMPTY_LIST
;
6062 spin_lock_irq(&conf
->device_lock
);
6063 if (!test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
)) {
6064 bio_list_merge(&tmp
, &conf
->return_bi
);
6065 bio_list_init(&conf
->return_bi
);
6067 spin_unlock_irq(&conf
->device_lock
);
6071 blk_start_plug(&plug
);
6073 spin_lock_irq(&conf
->device_lock
);
6076 int batch_size
, released
;
6078 released
= release_stripe_list(conf
, conf
->temp_inactive_list
);
6080 clear_bit(R5_DID_ALLOC
, &conf
->cache_state
);
6083 !list_empty(&conf
->bitmap_list
)) {
6084 /* Now is a good time to flush some bitmap updates */
6086 spin_unlock_irq(&conf
->device_lock
);
6087 bitmap_unplug(mddev
->bitmap
);
6088 spin_lock_irq(&conf
->device_lock
);
6089 conf
->seq_write
= conf
->seq_flush
;
6090 activate_bit_delay(conf
, conf
->temp_inactive_list
);
6092 raid5_activate_delayed(conf
);
6094 while ((bio
= remove_bio_from_retry(conf
))) {
6096 spin_unlock_irq(&conf
->device_lock
);
6097 ok
= retry_aligned_read(conf
, bio
);
6098 spin_lock_irq(&conf
->device_lock
);
6104 batch_size
= handle_active_stripes(conf
, ANY_GROUP
, NULL
,
6105 conf
->temp_inactive_list
);
6106 if (!batch_size
&& !released
)
6108 handled
+= batch_size
;
6110 if (mddev
->sb_flags
& ~(1 << MD_SB_CHANGE_PENDING
)) {
6111 spin_unlock_irq(&conf
->device_lock
);
6112 md_check_recovery(mddev
);
6113 spin_lock_irq(&conf
->device_lock
);
6116 pr_debug("%d stripes handled\n", handled
);
6118 spin_unlock_irq(&conf
->device_lock
);
6119 if (test_and_clear_bit(R5_ALLOC_MORE
, &conf
->cache_state
) &&
6120 mutex_trylock(&conf
->cache_size_mutex
)) {
6121 grow_one_stripe(conf
, __GFP_NOWARN
);
6122 /* Set flag even if allocation failed. This helps
6123 * slow down allocation requests when mem is short
6125 set_bit(R5_DID_ALLOC
, &conf
->cache_state
);
6126 mutex_unlock(&conf
->cache_size_mutex
);
6129 r5l_flush_stripe_to_raid(conf
->log
);
6131 async_tx_issue_pending_all();
6132 blk_finish_plug(&plug
);
6134 pr_debug("--- raid5d inactive\n");
6138 raid5_show_stripe_cache_size(struct mddev
*mddev
, char *page
)
6140 struct r5conf
*conf
;
6142 spin_lock(&mddev
->lock
);
6143 conf
= mddev
->private;
6145 ret
= sprintf(page
, "%d\n", conf
->min_nr_stripes
);
6146 spin_unlock(&mddev
->lock
);
6151 raid5_set_cache_size(struct mddev
*mddev
, int size
)
6153 struct r5conf
*conf
= mddev
->private;
6156 if (size
<= 16 || size
> 32768)
6159 conf
->min_nr_stripes
= size
;
6160 mutex_lock(&conf
->cache_size_mutex
);
6161 while (size
< conf
->max_nr_stripes
&&
6162 drop_one_stripe(conf
))
6164 mutex_unlock(&conf
->cache_size_mutex
);
6167 err
= md_allow_write(mddev
);
6171 mutex_lock(&conf
->cache_size_mutex
);
6172 while (size
> conf
->max_nr_stripes
)
6173 if (!grow_one_stripe(conf
, GFP_KERNEL
))
6175 mutex_unlock(&conf
->cache_size_mutex
);
6179 EXPORT_SYMBOL(raid5_set_cache_size
);
6182 raid5_store_stripe_cache_size(struct mddev
*mddev
, const char *page
, size_t len
)
6184 struct r5conf
*conf
;
6188 if (len
>= PAGE_SIZE
)
6190 if (kstrtoul(page
, 10, &new))
6192 err
= mddev_lock(mddev
);
6195 conf
= mddev
->private;
6199 err
= raid5_set_cache_size(mddev
, new);
6200 mddev_unlock(mddev
);
6205 static struct md_sysfs_entry
6206 raid5_stripecache_size
= __ATTR(stripe_cache_size
, S_IRUGO
| S_IWUSR
,
6207 raid5_show_stripe_cache_size
,
6208 raid5_store_stripe_cache_size
);
6211 raid5_show_rmw_level(struct mddev
*mddev
, char *page
)
6213 struct r5conf
*conf
= mddev
->private;
6215 return sprintf(page
, "%d\n", conf
->rmw_level
);
6221 raid5_store_rmw_level(struct mddev
*mddev
, const char *page
, size_t len
)
6223 struct r5conf
*conf
= mddev
->private;
6229 if (len
>= PAGE_SIZE
)
6232 if (kstrtoul(page
, 10, &new))
6235 if (new != PARITY_DISABLE_RMW
&& !raid6_call
.xor_syndrome
)
6238 if (new != PARITY_DISABLE_RMW
&&
6239 new != PARITY_ENABLE_RMW
&&
6240 new != PARITY_PREFER_RMW
)
6243 conf
->rmw_level
= new;
6247 static struct md_sysfs_entry
6248 raid5_rmw_level
= __ATTR(rmw_level
, S_IRUGO
| S_IWUSR
,
6249 raid5_show_rmw_level
,
6250 raid5_store_rmw_level
);
6254 raid5_show_preread_threshold(struct mddev
*mddev
, char *page
)
6256 struct r5conf
*conf
;
6258 spin_lock(&mddev
->lock
);
6259 conf
= mddev
->private;
6261 ret
= sprintf(page
, "%d\n", conf
->bypass_threshold
);
6262 spin_unlock(&mddev
->lock
);
6267 raid5_store_preread_threshold(struct mddev
*mddev
, const char *page
, size_t len
)
6269 struct r5conf
*conf
;
6273 if (len
>= PAGE_SIZE
)
6275 if (kstrtoul(page
, 10, &new))
6278 err
= mddev_lock(mddev
);
6281 conf
= mddev
->private;
6284 else if (new > conf
->min_nr_stripes
)
6287 conf
->bypass_threshold
= new;
6288 mddev_unlock(mddev
);
6292 static struct md_sysfs_entry
6293 raid5_preread_bypass_threshold
= __ATTR(preread_bypass_threshold
,
6295 raid5_show_preread_threshold
,
6296 raid5_store_preread_threshold
);
6299 raid5_show_skip_copy(struct mddev
*mddev
, char *page
)
6301 struct r5conf
*conf
;
6303 spin_lock(&mddev
->lock
);
6304 conf
= mddev
->private;
6306 ret
= sprintf(page
, "%d\n", conf
->skip_copy
);
6307 spin_unlock(&mddev
->lock
);
6312 raid5_store_skip_copy(struct mddev
*mddev
, const char *page
, size_t len
)
6314 struct r5conf
*conf
;
6318 if (len
>= PAGE_SIZE
)
6320 if (kstrtoul(page
, 10, &new))
6324 err
= mddev_lock(mddev
);
6327 conf
= mddev
->private;
6330 else if (new != conf
->skip_copy
) {
6331 mddev_suspend(mddev
);
6332 conf
->skip_copy
= new;
6334 mddev
->queue
->backing_dev_info
->capabilities
|=
6335 BDI_CAP_STABLE_WRITES
;
6337 mddev
->queue
->backing_dev_info
->capabilities
&=
6338 ~BDI_CAP_STABLE_WRITES
;
6339 mddev_resume(mddev
);
6341 mddev_unlock(mddev
);
6345 static struct md_sysfs_entry
6346 raid5_skip_copy
= __ATTR(skip_copy
, S_IRUGO
| S_IWUSR
,
6347 raid5_show_skip_copy
,
6348 raid5_store_skip_copy
);
6351 stripe_cache_active_show(struct mddev
*mddev
, char *page
)
6353 struct r5conf
*conf
= mddev
->private;
6355 return sprintf(page
, "%d\n", atomic_read(&conf
->active_stripes
));
6360 static struct md_sysfs_entry
6361 raid5_stripecache_active
= __ATTR_RO(stripe_cache_active
);
6364 raid5_show_group_thread_cnt(struct mddev
*mddev
, char *page
)
6366 struct r5conf
*conf
;
6368 spin_lock(&mddev
->lock
);
6369 conf
= mddev
->private;
6371 ret
= sprintf(page
, "%d\n", conf
->worker_cnt_per_group
);
6372 spin_unlock(&mddev
->lock
);
6376 static int alloc_thread_groups(struct r5conf
*conf
, int cnt
,
6378 int *worker_cnt_per_group
,
6379 struct r5worker_group
**worker_groups
);
6381 raid5_store_group_thread_cnt(struct mddev
*mddev
, const char *page
, size_t len
)
6383 struct r5conf
*conf
;
6386 struct r5worker_group
*new_groups
, *old_groups
;
6387 int group_cnt
, worker_cnt_per_group
;
6389 if (len
>= PAGE_SIZE
)
6391 if (kstrtoul(page
, 10, &new))
6394 err
= mddev_lock(mddev
);
6397 conf
= mddev
->private;
6400 else if (new != conf
->worker_cnt_per_group
) {
6401 mddev_suspend(mddev
);
6403 old_groups
= conf
->worker_groups
;
6405 flush_workqueue(raid5_wq
);
6407 err
= alloc_thread_groups(conf
, new,
6408 &group_cnt
, &worker_cnt_per_group
,
6411 spin_lock_irq(&conf
->device_lock
);
6412 conf
->group_cnt
= group_cnt
;
6413 conf
->worker_cnt_per_group
= worker_cnt_per_group
;
6414 conf
->worker_groups
= new_groups
;
6415 spin_unlock_irq(&conf
->device_lock
);
6418 kfree(old_groups
[0].workers
);
6421 mddev_resume(mddev
);
6423 mddev_unlock(mddev
);
6428 static struct md_sysfs_entry
6429 raid5_group_thread_cnt
= __ATTR(group_thread_cnt
, S_IRUGO
| S_IWUSR
,
6430 raid5_show_group_thread_cnt
,
6431 raid5_store_group_thread_cnt
);
6433 static struct attribute
*raid5_attrs
[] = {
6434 &raid5_stripecache_size
.attr
,
6435 &raid5_stripecache_active
.attr
,
6436 &raid5_preread_bypass_threshold
.attr
,
6437 &raid5_group_thread_cnt
.attr
,
6438 &raid5_skip_copy
.attr
,
6439 &raid5_rmw_level
.attr
,
6440 &r5c_journal_mode
.attr
,
6443 static struct attribute_group raid5_attrs_group
= {
6445 .attrs
= raid5_attrs
,
6448 static int alloc_thread_groups(struct r5conf
*conf
, int cnt
,
6450 int *worker_cnt_per_group
,
6451 struct r5worker_group
**worker_groups
)
6455 struct r5worker
*workers
;
6457 *worker_cnt_per_group
= cnt
;
6460 *worker_groups
= NULL
;
6463 *group_cnt
= num_possible_nodes();
6464 size
= sizeof(struct r5worker
) * cnt
;
6465 workers
= kzalloc(size
* *group_cnt
, GFP_NOIO
);
6466 *worker_groups
= kzalloc(sizeof(struct r5worker_group
) *
6467 *group_cnt
, GFP_NOIO
);
6468 if (!*worker_groups
|| !workers
) {
6470 kfree(*worker_groups
);
6474 for (i
= 0; i
< *group_cnt
; i
++) {
6475 struct r5worker_group
*group
;
6477 group
= &(*worker_groups
)[i
];
6478 INIT_LIST_HEAD(&group
->handle_list
);
6480 group
->workers
= workers
+ i
* cnt
;
6482 for (j
= 0; j
< cnt
; j
++) {
6483 struct r5worker
*worker
= group
->workers
+ j
;
6484 worker
->group
= group
;
6485 INIT_WORK(&worker
->work
, raid5_do_work
);
6487 for (k
= 0; k
< NR_STRIPE_HASH_LOCKS
; k
++)
6488 INIT_LIST_HEAD(worker
->temp_inactive_list
+ k
);
6495 static void free_thread_groups(struct r5conf
*conf
)
6497 if (conf
->worker_groups
)
6498 kfree(conf
->worker_groups
[0].workers
);
6499 kfree(conf
->worker_groups
);
6500 conf
->worker_groups
= NULL
;
6504 raid5_size(struct mddev
*mddev
, sector_t sectors
, int raid_disks
)
6506 struct r5conf
*conf
= mddev
->private;
6509 sectors
= mddev
->dev_sectors
;
6511 /* size is defined by the smallest of previous and new size */
6512 raid_disks
= min(conf
->raid_disks
, conf
->previous_raid_disks
);
6514 sectors
&= ~((sector_t
)conf
->chunk_sectors
- 1);
6515 sectors
&= ~((sector_t
)conf
->prev_chunk_sectors
- 1);
6516 return sectors
* (raid_disks
- conf
->max_degraded
);
6519 static void free_scratch_buffer(struct r5conf
*conf
, struct raid5_percpu
*percpu
)
6521 safe_put_page(percpu
->spare_page
);
6522 if (percpu
->scribble
)
6523 flex_array_free(percpu
->scribble
);
6524 percpu
->spare_page
= NULL
;
6525 percpu
->scribble
= NULL
;
6528 static int alloc_scratch_buffer(struct r5conf
*conf
, struct raid5_percpu
*percpu
)
6530 if (conf
->level
== 6 && !percpu
->spare_page
)
6531 percpu
->spare_page
= alloc_page(GFP_KERNEL
);
6532 if (!percpu
->scribble
)
6533 percpu
->scribble
= scribble_alloc(max(conf
->raid_disks
,
6534 conf
->previous_raid_disks
),
6535 max(conf
->chunk_sectors
,
6536 conf
->prev_chunk_sectors
)
6540 if (!percpu
->scribble
|| (conf
->level
== 6 && !percpu
->spare_page
)) {
6541 free_scratch_buffer(conf
, percpu
);
6548 static int raid456_cpu_dead(unsigned int cpu
, struct hlist_node
*node
)
6550 struct r5conf
*conf
= hlist_entry_safe(node
, struct r5conf
, node
);
6552 free_scratch_buffer(conf
, per_cpu_ptr(conf
->percpu
, cpu
));
6556 static void raid5_free_percpu(struct r5conf
*conf
)
6561 cpuhp_state_remove_instance(CPUHP_MD_RAID5_PREPARE
, &conf
->node
);
6562 free_percpu(conf
->percpu
);
6565 static void free_conf(struct r5conf
*conf
)
6570 r5l_exit_log(conf
->log
);
6571 if (conf
->shrinker
.nr_deferred
)
6572 unregister_shrinker(&conf
->shrinker
);
6574 free_thread_groups(conf
);
6575 shrink_stripes(conf
);
6576 raid5_free_percpu(conf
);
6577 for (i
= 0; i
< conf
->pool_size
; i
++)
6578 if (conf
->disks
[i
].extra_page
)
6579 put_page(conf
->disks
[i
].extra_page
);
6581 kfree(conf
->stripe_hashtbl
);
6585 static int raid456_cpu_up_prepare(unsigned int cpu
, struct hlist_node
*node
)
6587 struct r5conf
*conf
= hlist_entry_safe(node
, struct r5conf
, node
);
6588 struct raid5_percpu
*percpu
= per_cpu_ptr(conf
->percpu
, cpu
);
6590 if (alloc_scratch_buffer(conf
, percpu
)) {
6591 pr_warn("%s: failed memory allocation for cpu%u\n",
6598 static int raid5_alloc_percpu(struct r5conf
*conf
)
6602 conf
->percpu
= alloc_percpu(struct raid5_percpu
);
6606 err
= cpuhp_state_add_instance(CPUHP_MD_RAID5_PREPARE
, &conf
->node
);
6608 conf
->scribble_disks
= max(conf
->raid_disks
,
6609 conf
->previous_raid_disks
);
6610 conf
->scribble_sectors
= max(conf
->chunk_sectors
,
6611 conf
->prev_chunk_sectors
);
6616 static unsigned long raid5_cache_scan(struct shrinker
*shrink
,
6617 struct shrink_control
*sc
)
6619 struct r5conf
*conf
= container_of(shrink
, struct r5conf
, shrinker
);
6620 unsigned long ret
= SHRINK_STOP
;
6622 if (mutex_trylock(&conf
->cache_size_mutex
)) {
6624 while (ret
< sc
->nr_to_scan
&&
6625 conf
->max_nr_stripes
> conf
->min_nr_stripes
) {
6626 if (drop_one_stripe(conf
) == 0) {
6632 mutex_unlock(&conf
->cache_size_mutex
);
6637 static unsigned long raid5_cache_count(struct shrinker
*shrink
,
6638 struct shrink_control
*sc
)
6640 struct r5conf
*conf
= container_of(shrink
, struct r5conf
, shrinker
);
6642 if (conf
->max_nr_stripes
< conf
->min_nr_stripes
)
6643 /* unlikely, but not impossible */
6645 return conf
->max_nr_stripes
- conf
->min_nr_stripes
;
6648 static struct r5conf
*setup_conf(struct mddev
*mddev
)
6650 struct r5conf
*conf
;
6651 int raid_disk
, memory
, max_disks
;
6652 struct md_rdev
*rdev
;
6653 struct disk_info
*disk
;
6656 int group_cnt
, worker_cnt_per_group
;
6657 struct r5worker_group
*new_group
;
6659 if (mddev
->new_level
!= 5
6660 && mddev
->new_level
!= 4
6661 && mddev
->new_level
!= 6) {
6662 pr_warn("md/raid:%s: raid level not set to 4/5/6 (%d)\n",
6663 mdname(mddev
), mddev
->new_level
);
6664 return ERR_PTR(-EIO
);
6666 if ((mddev
->new_level
== 5
6667 && !algorithm_valid_raid5(mddev
->new_layout
)) ||
6668 (mddev
->new_level
== 6
6669 && !algorithm_valid_raid6(mddev
->new_layout
))) {
6670 pr_warn("md/raid:%s: layout %d not supported\n",
6671 mdname(mddev
), mddev
->new_layout
);
6672 return ERR_PTR(-EIO
);
6674 if (mddev
->new_level
== 6 && mddev
->raid_disks
< 4) {
6675 pr_warn("md/raid:%s: not enough configured devices (%d, minimum 4)\n",
6676 mdname(mddev
), mddev
->raid_disks
);
6677 return ERR_PTR(-EINVAL
);
6680 if (!mddev
->new_chunk_sectors
||
6681 (mddev
->new_chunk_sectors
<< 9) % PAGE_SIZE
||
6682 !is_power_of_2(mddev
->new_chunk_sectors
)) {
6683 pr_warn("md/raid:%s: invalid chunk size %d\n",
6684 mdname(mddev
), mddev
->new_chunk_sectors
<< 9);
6685 return ERR_PTR(-EINVAL
);
6688 conf
= kzalloc(sizeof(struct r5conf
), GFP_KERNEL
);
6691 /* Don't enable multi-threading by default*/
6692 if (!alloc_thread_groups(conf
, 0, &group_cnt
, &worker_cnt_per_group
,
6694 conf
->group_cnt
= group_cnt
;
6695 conf
->worker_cnt_per_group
= worker_cnt_per_group
;
6696 conf
->worker_groups
= new_group
;
6699 spin_lock_init(&conf
->device_lock
);
6700 seqcount_init(&conf
->gen_lock
);
6701 mutex_init(&conf
->cache_size_mutex
);
6702 init_waitqueue_head(&conf
->wait_for_quiescent
);
6703 init_waitqueue_head(&conf
->wait_for_stripe
);
6704 init_waitqueue_head(&conf
->wait_for_overlap
);
6705 INIT_LIST_HEAD(&conf
->handle_list
);
6706 INIT_LIST_HEAD(&conf
->hold_list
);
6707 INIT_LIST_HEAD(&conf
->delayed_list
);
6708 INIT_LIST_HEAD(&conf
->bitmap_list
);
6709 bio_list_init(&conf
->return_bi
);
6710 init_llist_head(&conf
->released_stripes
);
6711 atomic_set(&conf
->active_stripes
, 0);
6712 atomic_set(&conf
->preread_active_stripes
, 0);
6713 atomic_set(&conf
->active_aligned_reads
, 0);
6714 conf
->bypass_threshold
= BYPASS_THRESHOLD
;
6715 conf
->recovery_disabled
= mddev
->recovery_disabled
- 1;
6717 conf
->raid_disks
= mddev
->raid_disks
;
6718 if (mddev
->reshape_position
== MaxSector
)
6719 conf
->previous_raid_disks
= mddev
->raid_disks
;
6721 conf
->previous_raid_disks
= mddev
->raid_disks
- mddev
->delta_disks
;
6722 max_disks
= max(conf
->raid_disks
, conf
->previous_raid_disks
);
6724 conf
->disks
= kzalloc(max_disks
* sizeof(struct disk_info
),
6730 for (i
= 0; i
< max_disks
; i
++) {
6731 conf
->disks
[i
].extra_page
= alloc_page(GFP_KERNEL
);
6732 if (!conf
->disks
[i
].extra_page
)
6736 conf
->mddev
= mddev
;
6738 if ((conf
->stripe_hashtbl
= kzalloc(PAGE_SIZE
, GFP_KERNEL
)) == NULL
)
6741 /* We init hash_locks[0] separately to that it can be used
6742 * as the reference lock in the spin_lock_nest_lock() call
6743 * in lock_all_device_hash_locks_irq in order to convince
6744 * lockdep that we know what we are doing.
6746 spin_lock_init(conf
->hash_locks
);
6747 for (i
= 1; i
< NR_STRIPE_HASH_LOCKS
; i
++)
6748 spin_lock_init(conf
->hash_locks
+ i
);
6750 for (i
= 0; i
< NR_STRIPE_HASH_LOCKS
; i
++)
6751 INIT_LIST_HEAD(conf
->inactive_list
+ i
);
6753 for (i
= 0; i
< NR_STRIPE_HASH_LOCKS
; i
++)
6754 INIT_LIST_HEAD(conf
->temp_inactive_list
+ i
);
6756 atomic_set(&conf
->r5c_cached_full_stripes
, 0);
6757 INIT_LIST_HEAD(&conf
->r5c_full_stripe_list
);
6758 atomic_set(&conf
->r5c_cached_partial_stripes
, 0);
6759 INIT_LIST_HEAD(&conf
->r5c_partial_stripe_list
);
6761 conf
->level
= mddev
->new_level
;
6762 conf
->chunk_sectors
= mddev
->new_chunk_sectors
;
6763 if (raid5_alloc_percpu(conf
) != 0)
6766 pr_debug("raid456: run(%s) called.\n", mdname(mddev
));
6768 rdev_for_each(rdev
, mddev
) {
6769 raid_disk
= rdev
->raid_disk
;
6770 if (raid_disk
>= max_disks
6771 || raid_disk
< 0 || test_bit(Journal
, &rdev
->flags
))
6773 disk
= conf
->disks
+ raid_disk
;
6775 if (test_bit(Replacement
, &rdev
->flags
)) {
6776 if (disk
->replacement
)
6778 disk
->replacement
= rdev
;
6785 if (test_bit(In_sync
, &rdev
->flags
)) {
6786 char b
[BDEVNAME_SIZE
];
6787 pr_info("md/raid:%s: device %s operational as raid disk %d\n",
6788 mdname(mddev
), bdevname(rdev
->bdev
, b
), raid_disk
);
6789 } else if (rdev
->saved_raid_disk
!= raid_disk
)
6790 /* Cannot rely on bitmap to complete recovery */
6794 conf
->level
= mddev
->new_level
;
6795 if (conf
->level
== 6) {
6796 conf
->max_degraded
= 2;
6797 if (raid6_call
.xor_syndrome
)
6798 conf
->rmw_level
= PARITY_ENABLE_RMW
;
6800 conf
->rmw_level
= PARITY_DISABLE_RMW
;
6802 conf
->max_degraded
= 1;
6803 conf
->rmw_level
= PARITY_ENABLE_RMW
;
6805 conf
->algorithm
= mddev
->new_layout
;
6806 conf
->reshape_progress
= mddev
->reshape_position
;
6807 if (conf
->reshape_progress
!= MaxSector
) {
6808 conf
->prev_chunk_sectors
= mddev
->chunk_sectors
;
6809 conf
->prev_algo
= mddev
->layout
;
6811 conf
->prev_chunk_sectors
= conf
->chunk_sectors
;
6812 conf
->prev_algo
= conf
->algorithm
;
6815 conf
->min_nr_stripes
= NR_STRIPES
;
6816 if (mddev
->reshape_position
!= MaxSector
) {
6817 int stripes
= max_t(int,
6818 ((mddev
->chunk_sectors
<< 9) / STRIPE_SIZE
) * 4,
6819 ((mddev
->new_chunk_sectors
<< 9) / STRIPE_SIZE
) * 4);
6820 conf
->min_nr_stripes
= max(NR_STRIPES
, stripes
);
6821 if (conf
->min_nr_stripes
!= NR_STRIPES
)
6822 pr_info("md/raid:%s: force stripe size %d for reshape\n",
6823 mdname(mddev
), conf
->min_nr_stripes
);
6825 memory
= conf
->min_nr_stripes
* (sizeof(struct stripe_head
) +
6826 max_disks
* ((sizeof(struct bio
) + PAGE_SIZE
))) / 1024;
6827 atomic_set(&conf
->empty_inactive_list_nr
, NR_STRIPE_HASH_LOCKS
);
6828 if (grow_stripes(conf
, conf
->min_nr_stripes
)) {
6829 pr_warn("md/raid:%s: couldn't allocate %dkB for buffers\n",
6830 mdname(mddev
), memory
);
6833 pr_debug("md/raid:%s: allocated %dkB\n", mdname(mddev
), memory
);
6835 * Losing a stripe head costs more than the time to refill it,
6836 * it reduces the queue depth and so can hurt throughput.
6837 * So set it rather large, scaled by number of devices.
6839 conf
->shrinker
.seeks
= DEFAULT_SEEKS
* conf
->raid_disks
* 4;
6840 conf
->shrinker
.scan_objects
= raid5_cache_scan
;
6841 conf
->shrinker
.count_objects
= raid5_cache_count
;
6842 conf
->shrinker
.batch
= 128;
6843 conf
->shrinker
.flags
= 0;
6844 if (register_shrinker(&conf
->shrinker
)) {
6845 pr_warn("md/raid:%s: couldn't register shrinker.\n",
6850 sprintf(pers_name
, "raid%d", mddev
->new_level
);
6851 conf
->thread
= md_register_thread(raid5d
, mddev
, pers_name
);
6852 if (!conf
->thread
) {
6853 pr_warn("md/raid:%s: couldn't allocate thread.\n",
6863 return ERR_PTR(-EIO
);
6865 return ERR_PTR(-ENOMEM
);
6868 static int only_parity(int raid_disk
, int algo
, int raid_disks
, int max_degraded
)
6871 case ALGORITHM_PARITY_0
:
6872 if (raid_disk
< max_degraded
)
6875 case ALGORITHM_PARITY_N
:
6876 if (raid_disk
>= raid_disks
- max_degraded
)
6879 case ALGORITHM_PARITY_0_6
:
6880 if (raid_disk
== 0 ||
6881 raid_disk
== raid_disks
- 1)
6884 case ALGORITHM_LEFT_ASYMMETRIC_6
:
6885 case ALGORITHM_RIGHT_ASYMMETRIC_6
:
6886 case ALGORITHM_LEFT_SYMMETRIC_6
:
6887 case ALGORITHM_RIGHT_SYMMETRIC_6
:
6888 if (raid_disk
== raid_disks
- 1)
6894 static int raid5_run(struct mddev
*mddev
)
6896 struct r5conf
*conf
;
6897 int working_disks
= 0;
6898 int dirty_parity_disks
= 0;
6899 struct md_rdev
*rdev
;
6900 struct md_rdev
*journal_dev
= NULL
;
6901 sector_t reshape_offset
= 0;
6903 long long min_offset_diff
= 0;
6906 if (mddev
->recovery_cp
!= MaxSector
)
6907 pr_notice("md/raid:%s: not clean -- starting background reconstruction\n",
6910 rdev_for_each(rdev
, mddev
) {
6913 if (test_bit(Journal
, &rdev
->flags
)) {
6917 if (rdev
->raid_disk
< 0)
6919 diff
= (rdev
->new_data_offset
- rdev
->data_offset
);
6921 min_offset_diff
= diff
;
6923 } else if (mddev
->reshape_backwards
&&
6924 diff
< min_offset_diff
)
6925 min_offset_diff
= diff
;
6926 else if (!mddev
->reshape_backwards
&&
6927 diff
> min_offset_diff
)
6928 min_offset_diff
= diff
;
6931 if (mddev
->reshape_position
!= MaxSector
) {
6932 /* Check that we can continue the reshape.
6933 * Difficulties arise if the stripe we would write to
6934 * next is at or after the stripe we would read from next.
6935 * For a reshape that changes the number of devices, this
6936 * is only possible for a very short time, and mdadm makes
6937 * sure that time appears to have past before assembling
6938 * the array. So we fail if that time hasn't passed.
6939 * For a reshape that keeps the number of devices the same
6940 * mdadm must be monitoring the reshape can keeping the
6941 * critical areas read-only and backed up. It will start
6942 * the array in read-only mode, so we check for that.
6944 sector_t here_new
, here_old
;
6946 int max_degraded
= (mddev
->level
== 6 ? 2 : 1);
6951 pr_warn("md/raid:%s: don't support reshape with journal - aborting.\n",
6956 if (mddev
->new_level
!= mddev
->level
) {
6957 pr_warn("md/raid:%s: unsupported reshape required - aborting.\n",
6961 old_disks
= mddev
->raid_disks
- mddev
->delta_disks
;
6962 /* reshape_position must be on a new-stripe boundary, and one
6963 * further up in new geometry must map after here in old
6965 * If the chunk sizes are different, then as we perform reshape
6966 * in units of the largest of the two, reshape_position needs
6967 * be a multiple of the largest chunk size times new data disks.
6969 here_new
= mddev
->reshape_position
;
6970 chunk_sectors
= max(mddev
->chunk_sectors
, mddev
->new_chunk_sectors
);
6971 new_data_disks
= mddev
->raid_disks
- max_degraded
;
6972 if (sector_div(here_new
, chunk_sectors
* new_data_disks
)) {
6973 pr_warn("md/raid:%s: reshape_position not on a stripe boundary\n",
6977 reshape_offset
= here_new
* chunk_sectors
;
6978 /* here_new is the stripe we will write to */
6979 here_old
= mddev
->reshape_position
;
6980 sector_div(here_old
, chunk_sectors
* (old_disks
-max_degraded
));
6981 /* here_old is the first stripe that we might need to read
6983 if (mddev
->delta_disks
== 0) {
6984 /* We cannot be sure it is safe to start an in-place
6985 * reshape. It is only safe if user-space is monitoring
6986 * and taking constant backups.
6987 * mdadm always starts a situation like this in
6988 * readonly mode so it can take control before
6989 * allowing any writes. So just check for that.
6991 if (abs(min_offset_diff
) >= mddev
->chunk_sectors
&&
6992 abs(min_offset_diff
) >= mddev
->new_chunk_sectors
)
6993 /* not really in-place - so OK */;
6994 else if (mddev
->ro
== 0) {
6995 pr_warn("md/raid:%s: in-place reshape must be started in read-only mode - aborting\n",
6999 } else if (mddev
->reshape_backwards
7000 ? (here_new
* chunk_sectors
+ min_offset_diff
<=
7001 here_old
* chunk_sectors
)
7002 : (here_new
* chunk_sectors
>=
7003 here_old
* chunk_sectors
+ (-min_offset_diff
))) {
7004 /* Reading from the same stripe as writing to - bad */
7005 pr_warn("md/raid:%s: reshape_position too early for auto-recovery - aborting.\n",
7009 pr_debug("md/raid:%s: reshape will continue\n", mdname(mddev
));
7010 /* OK, we should be able to continue; */
7012 BUG_ON(mddev
->level
!= mddev
->new_level
);
7013 BUG_ON(mddev
->layout
!= mddev
->new_layout
);
7014 BUG_ON(mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
);
7015 BUG_ON(mddev
->delta_disks
!= 0);
7018 if (mddev
->private == NULL
)
7019 conf
= setup_conf(mddev
);
7021 conf
= mddev
->private;
7024 return PTR_ERR(conf
);
7026 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
7028 pr_warn("md/raid:%s: journal disk is missing, force array readonly\n",
7031 set_disk_ro(mddev
->gendisk
, 1);
7032 } else if (mddev
->recovery_cp
== MaxSector
)
7033 set_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
);
7036 conf
->min_offset_diff
= min_offset_diff
;
7037 mddev
->thread
= conf
->thread
;
7038 conf
->thread
= NULL
;
7039 mddev
->private = conf
;
7041 for (i
= 0; i
< conf
->raid_disks
&& conf
->previous_raid_disks
;
7043 rdev
= conf
->disks
[i
].rdev
;
7044 if (!rdev
&& conf
->disks
[i
].replacement
) {
7045 /* The replacement is all we have yet */
7046 rdev
= conf
->disks
[i
].replacement
;
7047 conf
->disks
[i
].replacement
= NULL
;
7048 clear_bit(Replacement
, &rdev
->flags
);
7049 conf
->disks
[i
].rdev
= rdev
;
7053 if (conf
->disks
[i
].replacement
&&
7054 conf
->reshape_progress
!= MaxSector
) {
7055 /* replacements and reshape simply do not mix. */
7056 pr_warn("md: cannot handle concurrent replacement and reshape.\n");
7059 if (test_bit(In_sync
, &rdev
->flags
)) {
7063 /* This disc is not fully in-sync. However if it
7064 * just stored parity (beyond the recovery_offset),
7065 * when we don't need to be concerned about the
7066 * array being dirty.
7067 * When reshape goes 'backwards', we never have
7068 * partially completed devices, so we only need
7069 * to worry about reshape going forwards.
7071 /* Hack because v0.91 doesn't store recovery_offset properly. */
7072 if (mddev
->major_version
== 0 &&
7073 mddev
->minor_version
> 90)
7074 rdev
->recovery_offset
= reshape_offset
;
7076 if (rdev
->recovery_offset
< reshape_offset
) {
7077 /* We need to check old and new layout */
7078 if (!only_parity(rdev
->raid_disk
,
7081 conf
->max_degraded
))
7084 if (!only_parity(rdev
->raid_disk
,
7086 conf
->previous_raid_disks
,
7087 conf
->max_degraded
))
7089 dirty_parity_disks
++;
7093 * 0 for a fully functional array, 1 or 2 for a degraded array.
7095 mddev
->degraded
= raid5_calc_degraded(conf
);
7097 if (has_failed(conf
)) {
7098 pr_crit("md/raid:%s: not enough operational devices (%d/%d failed)\n",
7099 mdname(mddev
), mddev
->degraded
, conf
->raid_disks
);
7103 /* device size must be a multiple of chunk size */
7104 mddev
->dev_sectors
&= ~(mddev
->chunk_sectors
- 1);
7105 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
7107 if (mddev
->degraded
> dirty_parity_disks
&&
7108 mddev
->recovery_cp
!= MaxSector
) {
7109 if (mddev
->ok_start_degraded
)
7110 pr_crit("md/raid:%s: starting dirty degraded array - data corruption possible.\n",
7113 pr_crit("md/raid:%s: cannot start dirty degraded array.\n",
7119 pr_info("md/raid:%s: raid level %d active with %d out of %d devices, algorithm %d\n",
7120 mdname(mddev
), conf
->level
,
7121 mddev
->raid_disks
-mddev
->degraded
, mddev
->raid_disks
,
7124 print_raid5_conf(conf
);
7126 if (conf
->reshape_progress
!= MaxSector
) {
7127 conf
->reshape_safe
= conf
->reshape_progress
;
7128 atomic_set(&conf
->reshape_stripes
, 0);
7129 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7130 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7131 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7132 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7133 mddev
->sync_thread
= md_register_thread(md_do_sync
, mddev
,
7137 /* Ok, everything is just fine now */
7138 if (mddev
->to_remove
== &raid5_attrs_group
)
7139 mddev
->to_remove
= NULL
;
7140 else if (mddev
->kobj
.sd
&&
7141 sysfs_create_group(&mddev
->kobj
, &raid5_attrs_group
))
7142 pr_warn("raid5: failed to create sysfs attributes for %s\n",
7144 md_set_array_sectors(mddev
, raid5_size(mddev
, 0, 0));
7148 bool discard_supported
= true;
7149 /* read-ahead size must cover two whole stripes, which
7150 * is 2 * (datadisks) * chunksize where 'n' is the
7151 * number of raid devices
7153 int data_disks
= conf
->previous_raid_disks
- conf
->max_degraded
;
7154 int stripe
= data_disks
*
7155 ((mddev
->chunk_sectors
<< 9) / PAGE_SIZE
);
7156 if (mddev
->queue
->backing_dev_info
->ra_pages
< 2 * stripe
)
7157 mddev
->queue
->backing_dev_info
->ra_pages
= 2 * stripe
;
7159 chunk_size
= mddev
->chunk_sectors
<< 9;
7160 blk_queue_io_min(mddev
->queue
, chunk_size
);
7161 blk_queue_io_opt(mddev
->queue
, chunk_size
*
7162 (conf
->raid_disks
- conf
->max_degraded
));
7163 mddev
->queue
->limits
.raid_partial_stripes_expensive
= 1;
7165 * We can only discard a whole stripe. It doesn't make sense to
7166 * discard data disk but write parity disk
7168 stripe
= stripe
* PAGE_SIZE
;
7169 /* Round up to power of 2, as discard handling
7170 * currently assumes that */
7171 while ((stripe
-1) & stripe
)
7172 stripe
= (stripe
| (stripe
-1)) + 1;
7173 mddev
->queue
->limits
.discard_alignment
= stripe
;
7174 mddev
->queue
->limits
.discard_granularity
= stripe
;
7177 * We use 16-bit counter of active stripes in bi_phys_segments
7178 * (minus one for over-loaded initialization)
7180 blk_queue_max_hw_sectors(mddev
->queue
, 0xfffe * STRIPE_SECTORS
);
7181 blk_queue_max_discard_sectors(mddev
->queue
,
7182 0xfffe * STRIPE_SECTORS
);
7185 * unaligned part of discard request will be ignored, so can't
7186 * guarantee discard_zeroes_data
7188 mddev
->queue
->limits
.discard_zeroes_data
= 0;
7190 blk_queue_max_write_same_sectors(mddev
->queue
, 0);
7192 rdev_for_each(rdev
, mddev
) {
7193 disk_stack_limits(mddev
->gendisk
, rdev
->bdev
,
7194 rdev
->data_offset
<< 9);
7195 disk_stack_limits(mddev
->gendisk
, rdev
->bdev
,
7196 rdev
->new_data_offset
<< 9);
7198 * discard_zeroes_data is required, otherwise data
7199 * could be lost. Consider a scenario: discard a stripe
7200 * (the stripe could be inconsistent if
7201 * discard_zeroes_data is 0); write one disk of the
7202 * stripe (the stripe could be inconsistent again
7203 * depending on which disks are used to calculate
7204 * parity); the disk is broken; The stripe data of this
7207 if (!blk_queue_discard(bdev_get_queue(rdev
->bdev
)) ||
7208 !bdev_get_queue(rdev
->bdev
)->
7209 limits
.discard_zeroes_data
)
7210 discard_supported
= false;
7211 /* Unfortunately, discard_zeroes_data is not currently
7212 * a guarantee - just a hint. So we only allow DISCARD
7213 * if the sysadmin has confirmed that only safe devices
7214 * are in use by setting a module parameter.
7216 if (!devices_handle_discard_safely
) {
7217 if (discard_supported
) {
7218 pr_info("md/raid456: discard support disabled due to uncertainty.\n");
7219 pr_info("Set raid456.devices_handle_discard_safely=Y to override.\n");
7221 discard_supported
= false;
7225 if (discard_supported
&&
7226 mddev
->queue
->limits
.max_discard_sectors
>= (stripe
>> 9) &&
7227 mddev
->queue
->limits
.discard_granularity
>= stripe
)
7228 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
,
7231 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD
,
7234 blk_queue_max_hw_sectors(mddev
->queue
, UINT_MAX
);
7238 char b
[BDEVNAME_SIZE
];
7240 pr_debug("md/raid:%s: using device %s as journal\n",
7241 mdname(mddev
), bdevname(journal_dev
->bdev
, b
));
7242 if (r5l_init_log(conf
, journal_dev
))
7248 md_unregister_thread(&mddev
->thread
);
7249 print_raid5_conf(conf
);
7251 mddev
->private = NULL
;
7252 pr_warn("md/raid:%s: failed to run raid set.\n", mdname(mddev
));
7256 static void raid5_free(struct mddev
*mddev
, void *priv
)
7258 struct r5conf
*conf
= priv
;
7261 mddev
->to_remove
= &raid5_attrs_group
;
7264 static void raid5_status(struct seq_file
*seq
, struct mddev
*mddev
)
7266 struct r5conf
*conf
= mddev
->private;
7269 seq_printf(seq
, " level %d, %dk chunk, algorithm %d", mddev
->level
,
7270 conf
->chunk_sectors
/ 2, mddev
->layout
);
7271 seq_printf (seq
, " [%d/%d] [", conf
->raid_disks
, conf
->raid_disks
- mddev
->degraded
);
7273 for (i
= 0; i
< conf
->raid_disks
; i
++) {
7274 struct md_rdev
*rdev
= rcu_dereference(conf
->disks
[i
].rdev
);
7275 seq_printf (seq
, "%s", rdev
&& test_bit(In_sync
, &rdev
->flags
) ? "U" : "_");
7278 seq_printf (seq
, "]");
7281 static void print_raid5_conf (struct r5conf
*conf
)
7284 struct disk_info
*tmp
;
7286 pr_debug("RAID conf printout:\n");
7288 pr_debug("(conf==NULL)\n");
7291 pr_debug(" --- level:%d rd:%d wd:%d\n", conf
->level
,
7293 conf
->raid_disks
- conf
->mddev
->degraded
);
7295 for (i
= 0; i
< conf
->raid_disks
; i
++) {
7296 char b
[BDEVNAME_SIZE
];
7297 tmp
= conf
->disks
+ i
;
7299 pr_debug(" disk %d, o:%d, dev:%s\n",
7300 i
, !test_bit(Faulty
, &tmp
->rdev
->flags
),
7301 bdevname(tmp
->rdev
->bdev
, b
));
7305 static int raid5_spare_active(struct mddev
*mddev
)
7308 struct r5conf
*conf
= mddev
->private;
7309 struct disk_info
*tmp
;
7311 unsigned long flags
;
7313 for (i
= 0; i
< conf
->raid_disks
; i
++) {
7314 tmp
= conf
->disks
+ i
;
7315 if (tmp
->replacement
7316 && tmp
->replacement
->recovery_offset
== MaxSector
7317 && !test_bit(Faulty
, &tmp
->replacement
->flags
)
7318 && !test_and_set_bit(In_sync
, &tmp
->replacement
->flags
)) {
7319 /* Replacement has just become active. */
7321 || !test_and_clear_bit(In_sync
, &tmp
->rdev
->flags
))
7324 /* Replaced device not technically faulty,
7325 * but we need to be sure it gets removed
7326 * and never re-added.
7328 set_bit(Faulty
, &tmp
->rdev
->flags
);
7329 sysfs_notify_dirent_safe(
7330 tmp
->rdev
->sysfs_state
);
7332 sysfs_notify_dirent_safe(tmp
->replacement
->sysfs_state
);
7333 } else if (tmp
->rdev
7334 && tmp
->rdev
->recovery_offset
== MaxSector
7335 && !test_bit(Faulty
, &tmp
->rdev
->flags
)
7336 && !test_and_set_bit(In_sync
, &tmp
->rdev
->flags
)) {
7338 sysfs_notify_dirent_safe(tmp
->rdev
->sysfs_state
);
7341 spin_lock_irqsave(&conf
->device_lock
, flags
);
7342 mddev
->degraded
= raid5_calc_degraded(conf
);
7343 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
7344 print_raid5_conf(conf
);
7348 static int raid5_remove_disk(struct mddev
*mddev
, struct md_rdev
*rdev
)
7350 struct r5conf
*conf
= mddev
->private;
7352 int number
= rdev
->raid_disk
;
7353 struct md_rdev
**rdevp
;
7354 struct disk_info
*p
= conf
->disks
+ number
;
7356 print_raid5_conf(conf
);
7357 if (test_bit(Journal
, &rdev
->flags
) && conf
->log
) {
7358 struct r5l_log
*log
;
7360 * we can't wait pending write here, as this is called in
7361 * raid5d, wait will deadlock.
7363 if (atomic_read(&mddev
->writes_pending
))
7371 if (rdev
== p
->rdev
)
7373 else if (rdev
== p
->replacement
)
7374 rdevp
= &p
->replacement
;
7378 if (number
>= conf
->raid_disks
&&
7379 conf
->reshape_progress
== MaxSector
)
7380 clear_bit(In_sync
, &rdev
->flags
);
7382 if (test_bit(In_sync
, &rdev
->flags
) ||
7383 atomic_read(&rdev
->nr_pending
)) {
7387 /* Only remove non-faulty devices if recovery
7390 if (!test_bit(Faulty
, &rdev
->flags
) &&
7391 mddev
->recovery_disabled
!= conf
->recovery_disabled
&&
7392 !has_failed(conf
) &&
7393 (!p
->replacement
|| p
->replacement
== rdev
) &&
7394 number
< conf
->raid_disks
) {
7399 if (!test_bit(RemoveSynchronized
, &rdev
->flags
)) {
7401 if (atomic_read(&rdev
->nr_pending
)) {
7402 /* lost the race, try later */
7407 if (p
->replacement
) {
7408 /* We must have just cleared 'rdev' */
7409 p
->rdev
= p
->replacement
;
7410 clear_bit(Replacement
, &p
->replacement
->flags
);
7411 smp_mb(); /* Make sure other CPUs may see both as identical
7412 * but will never see neither - if they are careful
7414 p
->replacement
= NULL
;
7415 clear_bit(WantReplacement
, &rdev
->flags
);
7417 /* We might have just removed the Replacement as faulty-
7418 * clear the bit just in case
7420 clear_bit(WantReplacement
, &rdev
->flags
);
7423 print_raid5_conf(conf
);
7427 static int raid5_add_disk(struct mddev
*mddev
, struct md_rdev
*rdev
)
7429 struct r5conf
*conf
= mddev
->private;
7432 struct disk_info
*p
;
7434 int last
= conf
->raid_disks
- 1;
7436 if (test_bit(Journal
, &rdev
->flags
)) {
7437 char b
[BDEVNAME_SIZE
];
7441 rdev
->raid_disk
= 0;
7443 * The array is in readonly mode if journal is missing, so no
7444 * write requests running. We should be safe
7446 r5l_init_log(conf
, rdev
);
7447 pr_debug("md/raid:%s: using device %s as journal\n",
7448 mdname(mddev
), bdevname(rdev
->bdev
, b
));
7451 if (mddev
->recovery_disabled
== conf
->recovery_disabled
)
7454 if (rdev
->saved_raid_disk
< 0 && has_failed(conf
))
7455 /* no point adding a device */
7458 if (rdev
->raid_disk
>= 0)
7459 first
= last
= rdev
->raid_disk
;
7462 * find the disk ... but prefer rdev->saved_raid_disk
7465 if (rdev
->saved_raid_disk
>= 0 &&
7466 rdev
->saved_raid_disk
>= first
&&
7467 conf
->disks
[rdev
->saved_raid_disk
].rdev
== NULL
)
7468 first
= rdev
->saved_raid_disk
;
7470 for (disk
= first
; disk
<= last
; disk
++) {
7471 p
= conf
->disks
+ disk
;
7472 if (p
->rdev
== NULL
) {
7473 clear_bit(In_sync
, &rdev
->flags
);
7474 rdev
->raid_disk
= disk
;
7476 if (rdev
->saved_raid_disk
!= disk
)
7478 rcu_assign_pointer(p
->rdev
, rdev
);
7482 for (disk
= first
; disk
<= last
; disk
++) {
7483 p
= conf
->disks
+ disk
;
7484 if (test_bit(WantReplacement
, &p
->rdev
->flags
) &&
7485 p
->replacement
== NULL
) {
7486 clear_bit(In_sync
, &rdev
->flags
);
7487 set_bit(Replacement
, &rdev
->flags
);
7488 rdev
->raid_disk
= disk
;
7491 rcu_assign_pointer(p
->replacement
, rdev
);
7496 print_raid5_conf(conf
);
7500 static int raid5_resize(struct mddev
*mddev
, sector_t sectors
)
7502 /* no resync is happening, and there is enough space
7503 * on all devices, so we can resize.
7504 * We need to make sure resync covers any new space.
7505 * If the array is shrinking we should possibly wait until
7506 * any io in the removed space completes, but it hardly seems
7510 struct r5conf
*conf
= mddev
->private;
7514 sectors
&= ~((sector_t
)conf
->chunk_sectors
- 1);
7515 newsize
= raid5_size(mddev
, sectors
, mddev
->raid_disks
);
7516 if (mddev
->external_size
&&
7517 mddev
->array_sectors
> newsize
)
7519 if (mddev
->bitmap
) {
7520 int ret
= bitmap_resize(mddev
->bitmap
, sectors
, 0, 0);
7524 md_set_array_sectors(mddev
, newsize
);
7525 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
7526 revalidate_disk(mddev
->gendisk
);
7527 if (sectors
> mddev
->dev_sectors
&&
7528 mddev
->recovery_cp
> mddev
->dev_sectors
) {
7529 mddev
->recovery_cp
= mddev
->dev_sectors
;
7530 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7532 mddev
->dev_sectors
= sectors
;
7533 mddev
->resync_max_sectors
= sectors
;
7537 static int check_stripe_cache(struct mddev
*mddev
)
7539 /* Can only proceed if there are plenty of stripe_heads.
7540 * We need a minimum of one full stripe,, and for sensible progress
7541 * it is best to have about 4 times that.
7542 * If we require 4 times, then the default 256 4K stripe_heads will
7543 * allow for chunk sizes up to 256K, which is probably OK.
7544 * If the chunk size is greater, user-space should request more
7545 * stripe_heads first.
7547 struct r5conf
*conf
= mddev
->private;
7548 if (((mddev
->chunk_sectors
<< 9) / STRIPE_SIZE
) * 4
7549 > conf
->min_nr_stripes
||
7550 ((mddev
->new_chunk_sectors
<< 9) / STRIPE_SIZE
) * 4
7551 > conf
->min_nr_stripes
) {
7552 pr_warn("md/raid:%s: reshape: not enough stripes. Needed %lu\n",
7554 ((max(mddev
->chunk_sectors
, mddev
->new_chunk_sectors
) << 9)
7561 static int check_reshape(struct mddev
*mddev
)
7563 struct r5conf
*conf
= mddev
->private;
7567 if (mddev
->delta_disks
== 0 &&
7568 mddev
->new_layout
== mddev
->layout
&&
7569 mddev
->new_chunk_sectors
== mddev
->chunk_sectors
)
7570 return 0; /* nothing to do */
7571 if (has_failed(conf
))
7573 if (mddev
->delta_disks
< 0 && mddev
->reshape_position
== MaxSector
) {
7574 /* We might be able to shrink, but the devices must
7575 * be made bigger first.
7576 * For raid6, 4 is the minimum size.
7577 * Otherwise 2 is the minimum
7580 if (mddev
->level
== 6)
7582 if (mddev
->raid_disks
+ mddev
->delta_disks
< min
)
7586 if (!check_stripe_cache(mddev
))
7589 if (mddev
->new_chunk_sectors
> mddev
->chunk_sectors
||
7590 mddev
->delta_disks
> 0)
7591 if (resize_chunks(conf
,
7592 conf
->previous_raid_disks
7593 + max(0, mddev
->delta_disks
),
7594 max(mddev
->new_chunk_sectors
,
7595 mddev
->chunk_sectors
)
7598 return resize_stripes(conf
, (conf
->previous_raid_disks
7599 + mddev
->delta_disks
));
7602 static int raid5_start_reshape(struct mddev
*mddev
)
7604 struct r5conf
*conf
= mddev
->private;
7605 struct md_rdev
*rdev
;
7607 unsigned long flags
;
7609 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
7612 if (!check_stripe_cache(mddev
))
7615 if (has_failed(conf
))
7618 rdev_for_each(rdev
, mddev
) {
7619 if (!test_bit(In_sync
, &rdev
->flags
)
7620 && !test_bit(Faulty
, &rdev
->flags
))
7624 if (spares
- mddev
->degraded
< mddev
->delta_disks
- conf
->max_degraded
)
7625 /* Not enough devices even to make a degraded array
7630 /* Refuse to reduce size of the array. Any reductions in
7631 * array size must be through explicit setting of array_size
7634 if (raid5_size(mddev
, 0, conf
->raid_disks
+ mddev
->delta_disks
)
7635 < mddev
->array_sectors
) {
7636 pr_warn("md/raid:%s: array size must be reduced before number of disks\n",
7641 atomic_set(&conf
->reshape_stripes
, 0);
7642 spin_lock_irq(&conf
->device_lock
);
7643 write_seqcount_begin(&conf
->gen_lock
);
7644 conf
->previous_raid_disks
= conf
->raid_disks
;
7645 conf
->raid_disks
+= mddev
->delta_disks
;
7646 conf
->prev_chunk_sectors
= conf
->chunk_sectors
;
7647 conf
->chunk_sectors
= mddev
->new_chunk_sectors
;
7648 conf
->prev_algo
= conf
->algorithm
;
7649 conf
->algorithm
= mddev
->new_layout
;
7651 /* Code that selects data_offset needs to see the generation update
7652 * if reshape_progress has been set - so a memory barrier needed.
7655 if (mddev
->reshape_backwards
)
7656 conf
->reshape_progress
= raid5_size(mddev
, 0, 0);
7658 conf
->reshape_progress
= 0;
7659 conf
->reshape_safe
= conf
->reshape_progress
;
7660 write_seqcount_end(&conf
->gen_lock
);
7661 spin_unlock_irq(&conf
->device_lock
);
7663 /* Now make sure any requests that proceeded on the assumption
7664 * the reshape wasn't running - like Discard or Read - have
7667 mddev_suspend(mddev
);
7668 mddev_resume(mddev
);
7670 /* Add some new drives, as many as will fit.
7671 * We know there are enough to make the newly sized array work.
7672 * Don't add devices if we are reducing the number of
7673 * devices in the array. This is because it is not possible
7674 * to correctly record the "partially reconstructed" state of
7675 * such devices during the reshape and confusion could result.
7677 if (mddev
->delta_disks
>= 0) {
7678 rdev_for_each(rdev
, mddev
)
7679 if (rdev
->raid_disk
< 0 &&
7680 !test_bit(Faulty
, &rdev
->flags
)) {
7681 if (raid5_add_disk(mddev
, rdev
) == 0) {
7683 >= conf
->previous_raid_disks
)
7684 set_bit(In_sync
, &rdev
->flags
);
7686 rdev
->recovery_offset
= 0;
7688 if (sysfs_link_rdev(mddev
, rdev
))
7689 /* Failure here is OK */;
7691 } else if (rdev
->raid_disk
>= conf
->previous_raid_disks
7692 && !test_bit(Faulty
, &rdev
->flags
)) {
7693 /* This is a spare that was manually added */
7694 set_bit(In_sync
, &rdev
->flags
);
7697 /* When a reshape changes the number of devices,
7698 * ->degraded is measured against the larger of the
7699 * pre and post number of devices.
7701 spin_lock_irqsave(&conf
->device_lock
, flags
);
7702 mddev
->degraded
= raid5_calc_degraded(conf
);
7703 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
7705 mddev
->raid_disks
= conf
->raid_disks
;
7706 mddev
->reshape_position
= conf
->reshape_progress
;
7707 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
7709 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7710 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7711 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7712 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7713 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7714 mddev
->sync_thread
= md_register_thread(md_do_sync
, mddev
,
7716 if (!mddev
->sync_thread
) {
7717 mddev
->recovery
= 0;
7718 spin_lock_irq(&conf
->device_lock
);
7719 write_seqcount_begin(&conf
->gen_lock
);
7720 mddev
->raid_disks
= conf
->raid_disks
= conf
->previous_raid_disks
;
7721 mddev
->new_chunk_sectors
=
7722 conf
->chunk_sectors
= conf
->prev_chunk_sectors
;
7723 mddev
->new_layout
= conf
->algorithm
= conf
->prev_algo
;
7724 rdev_for_each(rdev
, mddev
)
7725 rdev
->new_data_offset
= rdev
->data_offset
;
7727 conf
->generation
--;
7728 conf
->reshape_progress
= MaxSector
;
7729 mddev
->reshape_position
= MaxSector
;
7730 write_seqcount_end(&conf
->gen_lock
);
7731 spin_unlock_irq(&conf
->device_lock
);
7734 conf
->reshape_checkpoint
= jiffies
;
7735 md_wakeup_thread(mddev
->sync_thread
);
7736 md_new_event(mddev
);
7740 /* This is called from the reshape thread and should make any
7741 * changes needed in 'conf'
7743 static void end_reshape(struct r5conf
*conf
)
7746 if (!test_bit(MD_RECOVERY_INTR
, &conf
->mddev
->recovery
)) {
7747 struct md_rdev
*rdev
;
7749 spin_lock_irq(&conf
->device_lock
);
7750 conf
->previous_raid_disks
= conf
->raid_disks
;
7751 rdev_for_each(rdev
, conf
->mddev
)
7752 rdev
->data_offset
= rdev
->new_data_offset
;
7754 conf
->reshape_progress
= MaxSector
;
7755 conf
->mddev
->reshape_position
= MaxSector
;
7756 spin_unlock_irq(&conf
->device_lock
);
7757 wake_up(&conf
->wait_for_overlap
);
7759 /* read-ahead size must cover two whole stripes, which is
7760 * 2 * (datadisks) * chunksize where 'n' is the number of raid devices
7762 if (conf
->mddev
->queue
) {
7763 int data_disks
= conf
->raid_disks
- conf
->max_degraded
;
7764 int stripe
= data_disks
* ((conf
->chunk_sectors
<< 9)
7766 if (conf
->mddev
->queue
->backing_dev_info
->ra_pages
< 2 * stripe
)
7767 conf
->mddev
->queue
->backing_dev_info
->ra_pages
= 2 * stripe
;
7772 /* This is called from the raid5d thread with mddev_lock held.
7773 * It makes config changes to the device.
7775 static void raid5_finish_reshape(struct mddev
*mddev
)
7777 struct r5conf
*conf
= mddev
->private;
7779 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7781 if (mddev
->delta_disks
> 0) {
7782 md_set_array_sectors(mddev
, raid5_size(mddev
, 0, 0));
7784 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
7785 revalidate_disk(mddev
->gendisk
);
7789 spin_lock_irq(&conf
->device_lock
);
7790 mddev
->degraded
= raid5_calc_degraded(conf
);
7791 spin_unlock_irq(&conf
->device_lock
);
7792 for (d
= conf
->raid_disks
;
7793 d
< conf
->raid_disks
- mddev
->delta_disks
;
7795 struct md_rdev
*rdev
= conf
->disks
[d
].rdev
;
7797 clear_bit(In_sync
, &rdev
->flags
);
7798 rdev
= conf
->disks
[d
].replacement
;
7800 clear_bit(In_sync
, &rdev
->flags
);
7803 mddev
->layout
= conf
->algorithm
;
7804 mddev
->chunk_sectors
= conf
->chunk_sectors
;
7805 mddev
->reshape_position
= MaxSector
;
7806 mddev
->delta_disks
= 0;
7807 mddev
->reshape_backwards
= 0;
7811 static void raid5_quiesce(struct mddev
*mddev
, int state
)
7813 struct r5conf
*conf
= mddev
->private;
7816 case 2: /* resume for a suspend */
7817 wake_up(&conf
->wait_for_overlap
);
7820 case 1: /* stop all writes */
7821 lock_all_device_hash_locks_irq(conf
);
7822 /* '2' tells resync/reshape to pause so that all
7823 * active stripes can drain
7825 r5c_flush_cache(conf
, INT_MAX
);
7827 wait_event_cmd(conf
->wait_for_quiescent
,
7828 atomic_read(&conf
->active_stripes
) == 0 &&
7829 atomic_read(&conf
->active_aligned_reads
) == 0,
7830 unlock_all_device_hash_locks_irq(conf
),
7831 lock_all_device_hash_locks_irq(conf
));
7833 unlock_all_device_hash_locks_irq(conf
);
7834 /* allow reshape to continue */
7835 wake_up(&conf
->wait_for_overlap
);
7838 case 0: /* re-enable writes */
7839 lock_all_device_hash_locks_irq(conf
);
7841 wake_up(&conf
->wait_for_quiescent
);
7842 wake_up(&conf
->wait_for_overlap
);
7843 unlock_all_device_hash_locks_irq(conf
);
7846 r5l_quiesce(conf
->log
, state
);
7849 static void *raid45_takeover_raid0(struct mddev
*mddev
, int level
)
7851 struct r0conf
*raid0_conf
= mddev
->private;
7854 /* for raid0 takeover only one zone is supported */
7855 if (raid0_conf
->nr_strip_zones
> 1) {
7856 pr_warn("md/raid:%s: cannot takeover raid0 with more than one zone.\n",
7858 return ERR_PTR(-EINVAL
);
7861 sectors
= raid0_conf
->strip_zone
[0].zone_end
;
7862 sector_div(sectors
, raid0_conf
->strip_zone
[0].nb_dev
);
7863 mddev
->dev_sectors
= sectors
;
7864 mddev
->new_level
= level
;
7865 mddev
->new_layout
= ALGORITHM_PARITY_N
;
7866 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
7867 mddev
->raid_disks
+= 1;
7868 mddev
->delta_disks
= 1;
7869 /* make sure it will be not marked as dirty */
7870 mddev
->recovery_cp
= MaxSector
;
7872 return setup_conf(mddev
);
7875 static void *raid5_takeover_raid1(struct mddev
*mddev
)
7880 if (mddev
->raid_disks
!= 2 ||
7881 mddev
->degraded
> 1)
7882 return ERR_PTR(-EINVAL
);
7884 /* Should check if there are write-behind devices? */
7886 chunksect
= 64*2; /* 64K by default */
7888 /* The array must be an exact multiple of chunksize */
7889 while (chunksect
&& (mddev
->array_sectors
& (chunksect
-1)))
7892 if ((chunksect
<<9) < STRIPE_SIZE
)
7893 /* array size does not allow a suitable chunk size */
7894 return ERR_PTR(-EINVAL
);
7896 mddev
->new_level
= 5;
7897 mddev
->new_layout
= ALGORITHM_LEFT_SYMMETRIC
;
7898 mddev
->new_chunk_sectors
= chunksect
;
7900 ret
= setup_conf(mddev
);
7902 mddev_clear_unsupported_flags(mddev
,
7903 UNSUPPORTED_MDDEV_FLAGS
);
7907 static void *raid5_takeover_raid6(struct mddev
*mddev
)
7911 switch (mddev
->layout
) {
7912 case ALGORITHM_LEFT_ASYMMETRIC_6
:
7913 new_layout
= ALGORITHM_LEFT_ASYMMETRIC
;
7915 case ALGORITHM_RIGHT_ASYMMETRIC_6
:
7916 new_layout
= ALGORITHM_RIGHT_ASYMMETRIC
;
7918 case ALGORITHM_LEFT_SYMMETRIC_6
:
7919 new_layout
= ALGORITHM_LEFT_SYMMETRIC
;
7921 case ALGORITHM_RIGHT_SYMMETRIC_6
:
7922 new_layout
= ALGORITHM_RIGHT_SYMMETRIC
;
7924 case ALGORITHM_PARITY_0_6
:
7925 new_layout
= ALGORITHM_PARITY_0
;
7927 case ALGORITHM_PARITY_N
:
7928 new_layout
= ALGORITHM_PARITY_N
;
7931 return ERR_PTR(-EINVAL
);
7933 mddev
->new_level
= 5;
7934 mddev
->new_layout
= new_layout
;
7935 mddev
->delta_disks
= -1;
7936 mddev
->raid_disks
-= 1;
7937 return setup_conf(mddev
);
7940 static int raid5_check_reshape(struct mddev
*mddev
)
7942 /* For a 2-drive array, the layout and chunk size can be changed
7943 * immediately as not restriping is needed.
7944 * For larger arrays we record the new value - after validation
7945 * to be used by a reshape pass.
7947 struct r5conf
*conf
= mddev
->private;
7948 int new_chunk
= mddev
->new_chunk_sectors
;
7950 if (mddev
->new_layout
>= 0 && !algorithm_valid_raid5(mddev
->new_layout
))
7952 if (new_chunk
> 0) {
7953 if (!is_power_of_2(new_chunk
))
7955 if (new_chunk
< (PAGE_SIZE
>>9))
7957 if (mddev
->array_sectors
& (new_chunk
-1))
7958 /* not factor of array size */
7962 /* They look valid */
7964 if (mddev
->raid_disks
== 2) {
7965 /* can make the change immediately */
7966 if (mddev
->new_layout
>= 0) {
7967 conf
->algorithm
= mddev
->new_layout
;
7968 mddev
->layout
= mddev
->new_layout
;
7970 if (new_chunk
> 0) {
7971 conf
->chunk_sectors
= new_chunk
;
7972 mddev
->chunk_sectors
= new_chunk
;
7974 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
7975 md_wakeup_thread(mddev
->thread
);
7977 return check_reshape(mddev
);
7980 static int raid6_check_reshape(struct mddev
*mddev
)
7982 int new_chunk
= mddev
->new_chunk_sectors
;
7984 if (mddev
->new_layout
>= 0 && !algorithm_valid_raid6(mddev
->new_layout
))
7986 if (new_chunk
> 0) {
7987 if (!is_power_of_2(new_chunk
))
7989 if (new_chunk
< (PAGE_SIZE
>> 9))
7991 if (mddev
->array_sectors
& (new_chunk
-1))
7992 /* not factor of array size */
7996 /* They look valid */
7997 return check_reshape(mddev
);
8000 static void *raid5_takeover(struct mddev
*mddev
)
8002 /* raid5 can take over:
8003 * raid0 - if there is only one strip zone - make it a raid4 layout
8004 * raid1 - if there are two drives. We need to know the chunk size
8005 * raid4 - trivial - just use a raid4 layout.
8006 * raid6 - Providing it is a *_6 layout
8008 if (mddev
->level
== 0)
8009 return raid45_takeover_raid0(mddev
, 5);
8010 if (mddev
->level
== 1)
8011 return raid5_takeover_raid1(mddev
);
8012 if (mddev
->level
== 4) {
8013 mddev
->new_layout
= ALGORITHM_PARITY_N
;
8014 mddev
->new_level
= 5;
8015 return setup_conf(mddev
);
8017 if (mddev
->level
== 6)
8018 return raid5_takeover_raid6(mddev
);
8020 return ERR_PTR(-EINVAL
);
8023 static void *raid4_takeover(struct mddev
*mddev
)
8025 /* raid4 can take over:
8026 * raid0 - if there is only one strip zone
8027 * raid5 - if layout is right
8029 if (mddev
->level
== 0)
8030 return raid45_takeover_raid0(mddev
, 4);
8031 if (mddev
->level
== 5 &&
8032 mddev
->layout
== ALGORITHM_PARITY_N
) {
8033 mddev
->new_layout
= 0;
8034 mddev
->new_level
= 4;
8035 return setup_conf(mddev
);
8037 return ERR_PTR(-EINVAL
);
8040 static struct md_personality raid5_personality
;
8042 static void *raid6_takeover(struct mddev
*mddev
)
8044 /* Currently can only take over a raid5. We map the
8045 * personality to an equivalent raid6 personality
8046 * with the Q block at the end.
8050 if (mddev
->pers
!= &raid5_personality
)
8051 return ERR_PTR(-EINVAL
);
8052 if (mddev
->degraded
> 1)
8053 return ERR_PTR(-EINVAL
);
8054 if (mddev
->raid_disks
> 253)
8055 return ERR_PTR(-EINVAL
);
8056 if (mddev
->raid_disks
< 3)
8057 return ERR_PTR(-EINVAL
);
8059 switch (mddev
->layout
) {
8060 case ALGORITHM_LEFT_ASYMMETRIC
:
8061 new_layout
= ALGORITHM_LEFT_ASYMMETRIC_6
;
8063 case ALGORITHM_RIGHT_ASYMMETRIC
:
8064 new_layout
= ALGORITHM_RIGHT_ASYMMETRIC_6
;
8066 case ALGORITHM_LEFT_SYMMETRIC
:
8067 new_layout
= ALGORITHM_LEFT_SYMMETRIC_6
;
8069 case ALGORITHM_RIGHT_SYMMETRIC
:
8070 new_layout
= ALGORITHM_RIGHT_SYMMETRIC_6
;
8072 case ALGORITHM_PARITY_0
:
8073 new_layout
= ALGORITHM_PARITY_0_6
;
8075 case ALGORITHM_PARITY_N
:
8076 new_layout
= ALGORITHM_PARITY_N
;
8079 return ERR_PTR(-EINVAL
);
8081 mddev
->new_level
= 6;
8082 mddev
->new_layout
= new_layout
;
8083 mddev
->delta_disks
= 1;
8084 mddev
->raid_disks
+= 1;
8085 return setup_conf(mddev
);
8088 static struct md_personality raid6_personality
=
8092 .owner
= THIS_MODULE
,
8093 .make_request
= raid5_make_request
,
8096 .status
= raid5_status
,
8097 .error_handler
= raid5_error
,
8098 .hot_add_disk
= raid5_add_disk
,
8099 .hot_remove_disk
= raid5_remove_disk
,
8100 .spare_active
= raid5_spare_active
,
8101 .sync_request
= raid5_sync_request
,
8102 .resize
= raid5_resize
,
8104 .check_reshape
= raid6_check_reshape
,
8105 .start_reshape
= raid5_start_reshape
,
8106 .finish_reshape
= raid5_finish_reshape
,
8107 .quiesce
= raid5_quiesce
,
8108 .takeover
= raid6_takeover
,
8109 .congested
= raid5_congested
,
8111 static struct md_personality raid5_personality
=
8115 .owner
= THIS_MODULE
,
8116 .make_request
= raid5_make_request
,
8119 .status
= raid5_status
,
8120 .error_handler
= raid5_error
,
8121 .hot_add_disk
= raid5_add_disk
,
8122 .hot_remove_disk
= raid5_remove_disk
,
8123 .spare_active
= raid5_spare_active
,
8124 .sync_request
= raid5_sync_request
,
8125 .resize
= raid5_resize
,
8127 .check_reshape
= raid5_check_reshape
,
8128 .start_reshape
= raid5_start_reshape
,
8129 .finish_reshape
= raid5_finish_reshape
,
8130 .quiesce
= raid5_quiesce
,
8131 .takeover
= raid5_takeover
,
8132 .congested
= raid5_congested
,
8135 static struct md_personality raid4_personality
=
8139 .owner
= THIS_MODULE
,
8140 .make_request
= raid5_make_request
,
8143 .status
= raid5_status
,
8144 .error_handler
= raid5_error
,
8145 .hot_add_disk
= raid5_add_disk
,
8146 .hot_remove_disk
= raid5_remove_disk
,
8147 .spare_active
= raid5_spare_active
,
8148 .sync_request
= raid5_sync_request
,
8149 .resize
= raid5_resize
,
8151 .check_reshape
= raid5_check_reshape
,
8152 .start_reshape
= raid5_start_reshape
,
8153 .finish_reshape
= raid5_finish_reshape
,
8154 .quiesce
= raid5_quiesce
,
8155 .takeover
= raid4_takeover
,
8156 .congested
= raid5_congested
,
8159 static int __init
raid5_init(void)
8163 raid5_wq
= alloc_workqueue("raid5wq",
8164 WQ_UNBOUND
|WQ_MEM_RECLAIM
|WQ_CPU_INTENSIVE
|WQ_SYSFS
, 0);
8168 ret
= cpuhp_setup_state_multi(CPUHP_MD_RAID5_PREPARE
,
8170 raid456_cpu_up_prepare
,
8173 destroy_workqueue(raid5_wq
);
8176 register_md_personality(&raid6_personality
);
8177 register_md_personality(&raid5_personality
);
8178 register_md_personality(&raid4_personality
);
8182 static void raid5_exit(void)
8184 unregister_md_personality(&raid6_personality
);
8185 unregister_md_personality(&raid5_personality
);
8186 unregister_md_personality(&raid4_personality
);
8187 cpuhp_remove_multi_state(CPUHP_MD_RAID5_PREPARE
);
8188 destroy_workqueue(raid5_wq
);
8191 module_init(raid5_init
);
8192 module_exit(raid5_exit
);
8193 MODULE_LICENSE("GPL");
8194 MODULE_DESCRIPTION("RAID4/5/6 (striping with parity) personality for MD");
8195 MODULE_ALIAS("md-personality-4"); /* RAID5 */
8196 MODULE_ALIAS("md-raid5");
8197 MODULE_ALIAS("md-raid4");
8198 MODULE_ALIAS("md-level-5");
8199 MODULE_ALIAS("md-level-4");
8200 MODULE_ALIAS("md-personality-8"); /* RAID6 */
8201 MODULE_ALIAS("md-raid6");
8202 MODULE_ALIAS("md-level-6");
8204 /* This used to be two separate modules, they were: */
8205 MODULE_ALIAS("raid5");
8206 MODULE_ALIAS("raid6");