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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>
59
60#include "md.h"
61#include "raid5.h"
62#include "raid0.h"
63#include "bitmap.h"
64
65#define cpu_to_group(cpu) cpu_to_node(cpu)
66#define ANY_GROUP NUMA_NO_NODE
67
68static bool devices_handle_discard_safely = false;
69module_param(devices_handle_discard_safely, bool, 0644);
70MODULE_PARM_DESC(devices_handle_discard_safely,
71 "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions");
72static struct workqueue_struct *raid5_wq;
73
74
75
76
77#define NR_STRIPES 256
78#define STRIPE_SIZE PAGE_SIZE
79#define STRIPE_SHIFT (PAGE_SHIFT - 9)
80#define STRIPE_SECTORS (STRIPE_SIZE>>9)
81#define IO_THRESHOLD 1
82#define BYPASS_THRESHOLD 1
83#define NR_HASH (PAGE_SIZE / sizeof(struct hlist_head))
84#define HASH_MASK (NR_HASH - 1)
85#define MAX_STRIPE_BATCH 8
86
87static inline struct hlist_head *stripe_hash(struct r5conf *conf, sector_t sect)
88{
89 int hash = (sect >> STRIPE_SHIFT) & HASH_MASK;
90 return &conf->stripe_hashtbl[hash];
91}
92
93static inline int stripe_hash_locks_hash(sector_t sect)
94{
95 return (sect >> STRIPE_SHIFT) & STRIPE_HASH_LOCKS_MASK;
96}
97
98static inline void lock_device_hash_lock(struct r5conf *conf, int hash)
99{
100 spin_lock_irq(conf->hash_locks + hash);
101 spin_lock(&conf->device_lock);
102}
103
104static inline void unlock_device_hash_lock(struct r5conf *conf, int hash)
105{
106 spin_unlock(&conf->device_lock);
107 spin_unlock_irq(conf->hash_locks + hash);
108}
109
110static inline void lock_all_device_hash_locks_irq(struct r5conf *conf)
111{
112 int i;
113 local_irq_disable();
114 spin_lock(conf->hash_locks);
115 for (i = 1; i < NR_STRIPE_HASH_LOCKS; i++)
116 spin_lock_nest_lock(conf->hash_locks + i, conf->hash_locks);
117 spin_lock(&conf->device_lock);
118}
119
120static inline void unlock_all_device_hash_locks_irq(struct r5conf *conf)
121{
122 int i;
123 spin_unlock(&conf->device_lock);
124 for (i = NR_STRIPE_HASH_LOCKS; i; i--)
125 spin_unlock(conf->hash_locks + i - 1);
126 local_irq_enable();
127}
128
129
130
131
132
133
134
135
136
137
138static inline struct bio *r5_next_bio(struct bio *bio, sector_t sector)
139{
140 int sectors = bio_sectors(bio);
141 if (bio->bi_iter.bi_sector + sectors < sector + STRIPE_SECTORS)
142 return bio->bi_next;
143 else
144 return NULL;
145}
146
147
148
149
150
151static inline int raid5_bi_processed_stripes(struct bio *bio)
152{
153 atomic_t *segments = (atomic_t *)&bio->bi_phys_segments;
154 return (atomic_read(segments) >> 16) & 0xffff;
155}
156
157static inline int raid5_dec_bi_active_stripes(struct bio *bio)
158{
159 atomic_t *segments = (atomic_t *)&bio->bi_phys_segments;
160 return atomic_sub_return(1, segments) & 0xffff;
161}
162
163static inline void raid5_inc_bi_active_stripes(struct bio *bio)
164{
165 atomic_t *segments = (atomic_t *)&bio->bi_phys_segments;
166 atomic_inc(segments);
167}
168
169static inline void raid5_set_bi_processed_stripes(struct bio *bio,
170 unsigned int cnt)
171{
172 atomic_t *segments = (atomic_t *)&bio->bi_phys_segments;
173 int old, new;
174
175 do {
176 old = atomic_read(segments);
177 new = (old & 0xffff) | (cnt << 16);
178 } while (atomic_cmpxchg(segments, old, new) != old);
179}
180
181static inline void raid5_set_bi_stripes(struct bio *bio, unsigned int cnt)
182{
183 atomic_t *segments = (atomic_t *)&bio->bi_phys_segments;
184 atomic_set(segments, cnt);
185}
186
187
188static inline int raid6_d0(struct stripe_head *sh)
189{
190 if (sh->ddf_layout)
191
192 return 0;
193
194 if (sh->qd_idx == sh->disks - 1)
195 return 0;
196 else
197 return sh->qd_idx + 1;
198}
199static inline int raid6_next_disk(int disk, int raid_disks)
200{
201 disk++;
202 return (disk < raid_disks) ? disk : 0;
203}
204
205
206
207
208
209
210static int raid6_idx_to_slot(int idx, struct stripe_head *sh,
211 int *count, int syndrome_disks)
212{
213 int slot = *count;
214
215 if (sh->ddf_layout)
216 (*count)++;
217 if (idx == sh->pd_idx)
218 return syndrome_disks;
219 if (idx == sh->qd_idx)
220 return syndrome_disks + 1;
221 if (!sh->ddf_layout)
222 (*count)++;
223 return slot;
224}
225
226static void return_io(struct bio *return_bi)
227{
228 struct bio *bi = return_bi;
229 while (bi) {
230
231 return_bi = bi->bi_next;
232 bi->bi_next = NULL;
233 bi->bi_iter.bi_size = 0;
234 trace_block_bio_complete(bdev_get_queue(bi->bi_bdev),
235 bi, 0);
236 bio_endio(bi, 0);
237 bi = return_bi;
238 }
239}
240
241static void print_raid5_conf (struct r5conf *conf);
242
243static int stripe_operations_active(struct stripe_head *sh)
244{
245 return sh->check_state || sh->reconstruct_state ||
246 test_bit(STRIPE_BIOFILL_RUN, &sh->state) ||
247 test_bit(STRIPE_COMPUTE_RUN, &sh->state);
248}
249
250static void raid5_wakeup_stripe_thread(struct stripe_head *sh)
251{
252 struct r5conf *conf = sh->raid_conf;
253 struct r5worker_group *group;
254 int thread_cnt;
255 int i, cpu = sh->cpu;
256
257 if (!cpu_online(cpu)) {
258 cpu = cpumask_any(cpu_online_mask);
259 sh->cpu = cpu;
260 }
261
262 if (list_empty(&sh->lru)) {
263 struct r5worker_group *group;
264 group = conf->worker_groups + cpu_to_group(cpu);
265 list_add_tail(&sh->lru, &group->handle_list);
266 group->stripes_cnt++;
267 sh->group = group;
268 }
269
270 if (conf->worker_cnt_per_group == 0) {
271 md_wakeup_thread(conf->mddev->thread);
272 return;
273 }
274
275 group = conf->worker_groups + cpu_to_group(sh->cpu);
276
277 group->workers[0].working = true;
278
279 queue_work_on(sh->cpu, raid5_wq, &group->workers[0].work);
280
281 thread_cnt = group->stripes_cnt / MAX_STRIPE_BATCH - 1;
282
283 for (i = 1; i < conf->worker_cnt_per_group && thread_cnt > 0; i++) {
284 if (group->workers[i].working == false) {
285 group->workers[i].working = true;
286 queue_work_on(sh->cpu, raid5_wq,
287 &group->workers[i].work);
288 thread_cnt--;
289 }
290 }
291}
292
293static void do_release_stripe(struct r5conf *conf, struct stripe_head *sh,
294 struct list_head *temp_inactive_list)
295{
296 BUG_ON(!list_empty(&sh->lru));
297 BUG_ON(atomic_read(&conf->active_stripes)==0);
298 if (test_bit(STRIPE_HANDLE, &sh->state)) {
299 if (test_bit(STRIPE_DELAYED, &sh->state) &&
300 !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
301 list_add_tail(&sh->lru, &conf->delayed_list);
302 else if (test_bit(STRIPE_BIT_DELAY, &sh->state) &&
303 sh->bm_seq - conf->seq_write > 0)
304 list_add_tail(&sh->lru, &conf->bitmap_list);
305 else {
306 clear_bit(STRIPE_DELAYED, &sh->state);
307 clear_bit(STRIPE_BIT_DELAY, &sh->state);
308 if (conf->worker_cnt_per_group == 0) {
309 list_add_tail(&sh->lru, &conf->handle_list);
310 } else {
311 raid5_wakeup_stripe_thread(sh);
312 return;
313 }
314 }
315 md_wakeup_thread(conf->mddev->thread);
316 } else {
317 BUG_ON(stripe_operations_active(sh));
318 if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
319 if (atomic_dec_return(&conf->preread_active_stripes)
320 < IO_THRESHOLD)
321 md_wakeup_thread(conf->mddev->thread);
322 atomic_dec(&conf->active_stripes);
323 if (!test_bit(STRIPE_EXPANDING, &sh->state))
324 list_add_tail(&sh->lru, temp_inactive_list);
325 }
326}
327
328static void __release_stripe(struct r5conf *conf, struct stripe_head *sh,
329 struct list_head *temp_inactive_list)
330{
331 if (atomic_dec_and_test(&sh->count))
332 do_release_stripe(conf, sh, temp_inactive_list);
333}
334
335
336
337
338
339
340
341
342static void release_inactive_stripe_list(struct r5conf *conf,
343 struct list_head *temp_inactive_list,
344 int hash)
345{
346 int size;
347 bool do_wakeup = false;
348 unsigned long flags;
349
350 if (hash == NR_STRIPE_HASH_LOCKS) {
351 size = NR_STRIPE_HASH_LOCKS;
352 hash = NR_STRIPE_HASH_LOCKS - 1;
353 } else
354 size = 1;
355 while (size) {
356 struct list_head *list = &temp_inactive_list[size - 1];
357
358
359
360
361
362 if (!list_empty_careful(list)) {
363 spin_lock_irqsave(conf->hash_locks + hash, flags);
364 if (list_empty(conf->inactive_list + hash) &&
365 !list_empty(list))
366 atomic_dec(&conf->empty_inactive_list_nr);
367 list_splice_tail_init(list, conf->inactive_list + hash);
368 do_wakeup = true;
369 spin_unlock_irqrestore(conf->hash_locks + hash, flags);
370 }
371 size--;
372 hash--;
373 }
374
375 if (do_wakeup) {
376 wake_up(&conf->wait_for_stripe);
377 if (conf->retry_read_aligned)
378 md_wakeup_thread(conf->mddev->thread);
379 }
380}
381
382
383static int release_stripe_list(struct r5conf *conf,
384 struct list_head *temp_inactive_list)
385{
386 struct stripe_head *sh;
387 int count = 0;
388 struct llist_node *head;
389
390 head = llist_del_all(&conf->released_stripes);
391 head = llist_reverse_order(head);
392 while (head) {
393 int hash;
394
395 sh = llist_entry(head, struct stripe_head, release_list);
396 head = llist_next(head);
397
398 smp_mb();
399 clear_bit(STRIPE_ON_RELEASE_LIST, &sh->state);
400
401
402
403
404
405 hash = sh->hash_lock_index;
406 __release_stripe(conf, sh, &temp_inactive_list[hash]);
407 count++;
408 }
409
410 return count;
411}
412
413static void release_stripe(struct stripe_head *sh)
414{
415 struct r5conf *conf = sh->raid_conf;
416 unsigned long flags;
417 struct list_head list;
418 int hash;
419 bool wakeup;
420
421
422
423 if (atomic_add_unless(&sh->count, -1, 1))
424 return;
425
426 if (unlikely(!conf->mddev->thread) ||
427 test_and_set_bit(STRIPE_ON_RELEASE_LIST, &sh->state))
428 goto slow_path;
429 wakeup = llist_add(&sh->release_list, &conf->released_stripes);
430 if (wakeup)
431 md_wakeup_thread(conf->mddev->thread);
432 return;
433slow_path:
434 local_irq_save(flags);
435
436 if (atomic_dec_and_lock(&sh->count, &conf->device_lock)) {
437 INIT_LIST_HEAD(&list);
438 hash = sh->hash_lock_index;
439 do_release_stripe(conf, sh, &list);
440 spin_unlock(&conf->device_lock);
441 release_inactive_stripe_list(conf, &list, hash);
442 }
443 local_irq_restore(flags);
444}
445
446static inline void remove_hash(struct stripe_head *sh)
447{
448 pr_debug("remove_hash(), stripe %llu\n",
449 (unsigned long long)sh->sector);
450
451 hlist_del_init(&sh->hash);
452}
453
454static inline void insert_hash(struct r5conf *conf, struct stripe_head *sh)
455{
456 struct hlist_head *hp = stripe_hash(conf, sh->sector);
457
458 pr_debug("insert_hash(), stripe %llu\n",
459 (unsigned long long)sh->sector);
460
461 hlist_add_head(&sh->hash, hp);
462}
463
464
465static struct stripe_head *get_free_stripe(struct r5conf *conf, int hash)
466{
467 struct stripe_head *sh = NULL;
468 struct list_head *first;
469
470 if (list_empty(conf->inactive_list + hash))
471 goto out;
472 first = (conf->inactive_list + hash)->next;
473 sh = list_entry(first, struct stripe_head, lru);
474 list_del_init(first);
475 remove_hash(sh);
476 atomic_inc(&conf->active_stripes);
477 BUG_ON(hash != sh->hash_lock_index);
478 if (list_empty(conf->inactive_list + hash))
479 atomic_inc(&conf->empty_inactive_list_nr);
480out:
481 return sh;
482}
483
484static void shrink_buffers(struct stripe_head *sh)
485{
486 struct page *p;
487 int i;
488 int num = sh->raid_conf->pool_size;
489
490 for (i = 0; i < num ; i++) {
491 WARN_ON(sh->dev[i].page != sh->dev[i].orig_page);
492 p = sh->dev[i].page;
493 if (!p)
494 continue;
495 sh->dev[i].page = NULL;
496 put_page(p);
497 }
498}
499
500static int grow_buffers(struct stripe_head *sh, gfp_t gfp)
501{
502 int i;
503 int num = sh->raid_conf->pool_size;
504
505 for (i = 0; i < num; i++) {
506 struct page *page;
507
508 if (!(page = alloc_page(gfp))) {
509 return 1;
510 }
511 sh->dev[i].page = page;
512 sh->dev[i].orig_page = page;
513 }
514 return 0;
515}
516
517static void raid5_build_block(struct stripe_head *sh, int i, int previous);
518static void stripe_set_idx(sector_t stripe, struct r5conf *conf, int previous,
519 struct stripe_head *sh);
520
521static void init_stripe(struct stripe_head *sh, sector_t sector, int previous)
522{
523 struct r5conf *conf = sh->raid_conf;
524 int i, seq;
525
526 BUG_ON(atomic_read(&sh->count) != 0);
527 BUG_ON(test_bit(STRIPE_HANDLE, &sh->state));
528 BUG_ON(stripe_operations_active(sh));
529 BUG_ON(sh->batch_head);
530
531 pr_debug("init_stripe called, stripe %llu\n",
532 (unsigned long long)sector);
533retry:
534 seq = read_seqcount_begin(&conf->gen_lock);
535 sh->generation = conf->generation - previous;
536 sh->disks = previous ? conf->previous_raid_disks : conf->raid_disks;
537 sh->sector = sector;
538 stripe_set_idx(sector, conf, previous, sh);
539 sh->state = 0;
540
541 for (i = sh->disks; i--; ) {
542 struct r5dev *dev = &sh->dev[i];
543
544 if (dev->toread || dev->read || dev->towrite || dev->written ||
545 test_bit(R5_LOCKED, &dev->flags)) {
546 printk(KERN_ERR "sector=%llx i=%d %p %p %p %p %d\n",
547 (unsigned long long)sh->sector, i, dev->toread,
548 dev->read, dev->towrite, dev->written,
549 test_bit(R5_LOCKED, &dev->flags));
550 WARN_ON(1);
551 }
552 dev->flags = 0;
553 raid5_build_block(sh, i, previous);
554 }
555 if (read_seqcount_retry(&conf->gen_lock, seq))
556 goto retry;
557 sh->overwrite_disks = 0;
558 insert_hash(conf, sh);
559 sh->cpu = smp_processor_id();
560 set_bit(STRIPE_BATCH_READY, &sh->state);
561}
562
563static struct stripe_head *__find_stripe(struct r5conf *conf, sector_t sector,
564 short generation)
565{
566 struct stripe_head *sh;
567
568 pr_debug("__find_stripe, sector %llu\n", (unsigned long long)sector);
569 hlist_for_each_entry(sh, stripe_hash(conf, sector), hash)
570 if (sh->sector == sector && sh->generation == generation)
571 return sh;
572 pr_debug("__stripe %llu not in cache\n", (unsigned long long)sector);
573 return NULL;
574}
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589static int calc_degraded(struct r5conf *conf)
590{
591 int degraded, degraded2;
592 int i;
593
594 rcu_read_lock();
595 degraded = 0;
596 for (i = 0; i < conf->previous_raid_disks; i++) {
597 struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev);
598 if (rdev && test_bit(Faulty, &rdev->flags))
599 rdev = rcu_dereference(conf->disks[i].replacement);
600 if (!rdev || test_bit(Faulty, &rdev->flags))
601 degraded++;
602 else if (test_bit(In_sync, &rdev->flags))
603 ;
604 else
605
606
607
608
609
610
611
612
613
614 if (conf->raid_disks >= conf->previous_raid_disks)
615 degraded++;
616 }
617 rcu_read_unlock();
618 if (conf->raid_disks == conf->previous_raid_disks)
619 return degraded;
620 rcu_read_lock();
621 degraded2 = 0;
622 for (i = 0; i < conf->raid_disks; i++) {
623 struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev);
624 if (rdev && test_bit(Faulty, &rdev->flags))
625 rdev = rcu_dereference(conf->disks[i].replacement);
626 if (!rdev || test_bit(Faulty, &rdev->flags))
627 degraded2++;
628 else if (test_bit(In_sync, &rdev->flags))
629 ;
630 else
631
632
633
634
635
636 if (conf->raid_disks <= conf->previous_raid_disks)
637 degraded2++;
638 }
639 rcu_read_unlock();
640 if (degraded2 > degraded)
641 return degraded2;
642 return degraded;
643}
644
645static int has_failed(struct r5conf *conf)
646{
647 int degraded;
648
649 if (conf->mddev->reshape_position == MaxSector)
650 return conf->mddev->degraded > conf->max_degraded;
651
652 degraded = calc_degraded(conf);
653 if (degraded > conf->max_degraded)
654 return 1;
655 return 0;
656}
657
658static struct stripe_head *
659get_active_stripe(struct r5conf *conf, sector_t sector,
660 int previous, int noblock, int noquiesce)
661{
662 struct stripe_head *sh;
663 int hash = stripe_hash_locks_hash(sector);
664
665 pr_debug("get_stripe, sector %llu\n", (unsigned long long)sector);
666
667 spin_lock_irq(conf->hash_locks + hash);
668
669 do {
670 wait_event_lock_irq(conf->wait_for_stripe,
671 conf->quiesce == 0 || noquiesce,
672 *(conf->hash_locks + hash));
673 sh = __find_stripe(conf, sector, conf->generation - previous);
674 if (!sh) {
675 if (!test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state)) {
676 sh = get_free_stripe(conf, hash);
677 if (!sh && llist_empty(&conf->released_stripes) &&
678 !test_bit(R5_DID_ALLOC, &conf->cache_state))
679 set_bit(R5_ALLOC_MORE,
680 &conf->cache_state);
681 }
682 if (noblock && sh == NULL)
683 break;
684 if (!sh) {
685 set_bit(R5_INACTIVE_BLOCKED,
686 &conf->cache_state);
687 wait_event_lock_irq(
688 conf->wait_for_stripe,
689 !list_empty(conf->inactive_list + hash) &&
690 (atomic_read(&conf->active_stripes)
691 < (conf->max_nr_stripes * 3 / 4)
692 || !test_bit(R5_INACTIVE_BLOCKED,
693 &conf->cache_state)),
694 *(conf->hash_locks + hash));
695 clear_bit(R5_INACTIVE_BLOCKED,
696 &conf->cache_state);
697 } else {
698 init_stripe(sh, sector, previous);
699 atomic_inc(&sh->count);
700 }
701 } else if (!atomic_inc_not_zero(&sh->count)) {
702 spin_lock(&conf->device_lock);
703 if (!atomic_read(&sh->count)) {
704 if (!test_bit(STRIPE_HANDLE, &sh->state))
705 atomic_inc(&conf->active_stripes);
706 BUG_ON(list_empty(&sh->lru) &&
707 !test_bit(STRIPE_EXPANDING, &sh->state));
708 list_del_init(&sh->lru);
709 if (sh->group) {
710 sh->group->stripes_cnt--;
711 sh->group = NULL;
712 }
713 }
714 atomic_inc(&sh->count);
715 spin_unlock(&conf->device_lock);
716 }
717 } while (sh == NULL);
718
719 spin_unlock_irq(conf->hash_locks + hash);
720 return sh;
721}
722
723static bool is_full_stripe_write(struct stripe_head *sh)
724{
725 BUG_ON(sh->overwrite_disks > (sh->disks - sh->raid_conf->max_degraded));
726 return sh->overwrite_disks == (sh->disks - sh->raid_conf->max_degraded);
727}
728
729static void lock_two_stripes(struct stripe_head *sh1, struct stripe_head *sh2)
730{
731 local_irq_disable();
732 if (sh1 > sh2) {
733 spin_lock(&sh2->stripe_lock);
734 spin_lock_nested(&sh1->stripe_lock, 1);
735 } else {
736 spin_lock(&sh1->stripe_lock);
737 spin_lock_nested(&sh2->stripe_lock, 1);
738 }
739}
740
741static void unlock_two_stripes(struct stripe_head *sh1, struct stripe_head *sh2)
742{
743 spin_unlock(&sh1->stripe_lock);
744 spin_unlock(&sh2->stripe_lock);
745 local_irq_enable();
746}
747
748
749static bool stripe_can_batch(struct stripe_head *sh)
750{
751 return test_bit(STRIPE_BATCH_READY, &sh->state) &&
752 !test_bit(STRIPE_BITMAP_PENDING, &sh->state) &&
753 is_full_stripe_write(sh);
754}
755
756
757static void stripe_add_to_batch_list(struct r5conf *conf, struct stripe_head *sh)
758{
759 struct stripe_head *head;
760 sector_t head_sector, tmp_sec;
761 int hash;
762 int dd_idx;
763
764 if (!stripe_can_batch(sh))
765 return;
766
767 tmp_sec = sh->sector;
768 if (!sector_div(tmp_sec, conf->chunk_sectors))
769 return;
770 head_sector = sh->sector - STRIPE_SECTORS;
771
772 hash = stripe_hash_locks_hash(head_sector);
773 spin_lock_irq(conf->hash_locks + hash);
774 head = __find_stripe(conf, head_sector, conf->generation);
775 if (head && !atomic_inc_not_zero(&head->count)) {
776 spin_lock(&conf->device_lock);
777 if (!atomic_read(&head->count)) {
778 if (!test_bit(STRIPE_HANDLE, &head->state))
779 atomic_inc(&conf->active_stripes);
780 BUG_ON(list_empty(&head->lru) &&
781 !test_bit(STRIPE_EXPANDING, &head->state));
782 list_del_init(&head->lru);
783 if (head->group) {
784 head->group->stripes_cnt--;
785 head->group = NULL;
786 }
787 }
788 atomic_inc(&head->count);
789 spin_unlock(&conf->device_lock);
790 }
791 spin_unlock_irq(conf->hash_locks + hash);
792
793 if (!head)
794 return;
795 if (!stripe_can_batch(head))
796 goto out;
797
798 lock_two_stripes(head, sh);
799
800 if (!stripe_can_batch(head) || !stripe_can_batch(sh))
801 goto unlock_out;
802
803 if (sh->batch_head)
804 goto unlock_out;
805
806 dd_idx = 0;
807 while (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx)
808 dd_idx++;
809 if (head->dev[dd_idx].towrite->bi_rw != sh->dev[dd_idx].towrite->bi_rw)
810 goto unlock_out;
811
812 if (head->batch_head) {
813 spin_lock(&head->batch_head->batch_lock);
814
815 if (!stripe_can_batch(head)) {
816 spin_unlock(&head->batch_head->batch_lock);
817 goto unlock_out;
818 }
819
820
821
822
823
824 list_add(&sh->batch_list, &head->batch_list);
825 spin_unlock(&head->batch_head->batch_lock);
826
827 sh->batch_head = head->batch_head;
828 } else {
829 head->batch_head = head;
830 sh->batch_head = head->batch_head;
831 spin_lock(&head->batch_lock);
832 list_add_tail(&sh->batch_list, &head->batch_list);
833 spin_unlock(&head->batch_lock);
834 }
835
836 if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
837 if (atomic_dec_return(&conf->preread_active_stripes)
838 < IO_THRESHOLD)
839 md_wakeup_thread(conf->mddev->thread);
840
841 if (test_and_clear_bit(STRIPE_BIT_DELAY, &sh->state)) {
842 int seq = sh->bm_seq;
843 if (test_bit(STRIPE_BIT_DELAY, &sh->batch_head->state) &&
844 sh->batch_head->bm_seq > seq)
845 seq = sh->batch_head->bm_seq;
846 set_bit(STRIPE_BIT_DELAY, &sh->batch_head->state);
847 sh->batch_head->bm_seq = seq;
848 }
849
850 atomic_inc(&sh->count);
851unlock_out:
852 unlock_two_stripes(head, sh);
853out:
854 release_stripe(head);
855}
856
857
858
859
860static int use_new_offset(struct r5conf *conf, struct stripe_head *sh)
861{
862 sector_t progress = conf->reshape_progress;
863
864
865
866
867 smp_rmb();
868 if (progress == MaxSector)
869 return 0;
870 if (sh->generation == conf->generation - 1)
871 return 0;
872
873
874
875 return 1;
876}
877
878static void
879raid5_end_read_request(struct bio *bi, int error);
880static void
881raid5_end_write_request(struct bio *bi, int error);
882
883static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
884{
885 struct r5conf *conf = sh->raid_conf;
886 int i, disks = sh->disks;
887 struct stripe_head *head_sh = sh;
888
889 might_sleep();
890
891 for (i = disks; i--; ) {
892 int rw;
893 int replace_only = 0;
894 struct bio *bi, *rbi;
895 struct md_rdev *rdev, *rrdev = NULL;
896
897 sh = head_sh;
898 if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) {
899 if (test_and_clear_bit(R5_WantFUA, &sh->dev[i].flags))
900 rw = WRITE_FUA;
901 else
902 rw = WRITE;
903 if (test_bit(R5_Discard, &sh->dev[i].flags))
904 rw |= REQ_DISCARD;
905 } else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags))
906 rw = READ;
907 else if (test_and_clear_bit(R5_WantReplace,
908 &sh->dev[i].flags)) {
909 rw = WRITE;
910 replace_only = 1;
911 } else
912 continue;
913 if (test_and_clear_bit(R5_SyncIO, &sh->dev[i].flags))
914 rw |= REQ_SYNC;
915
916again:
917 bi = &sh->dev[i].req;
918 rbi = &sh->dev[i].rreq;
919
920 rcu_read_lock();
921 rrdev = rcu_dereference(conf->disks[i].replacement);
922 smp_mb();
923 rdev = rcu_dereference(conf->disks[i].rdev);
924 if (!rdev) {
925 rdev = rrdev;
926 rrdev = NULL;
927 }
928 if (rw & WRITE) {
929 if (replace_only)
930 rdev = NULL;
931 if (rdev == rrdev)
932
933 rrdev = NULL;
934 } else {
935 if (test_bit(R5_ReadRepl, &head_sh->dev[i].flags) && rrdev)
936 rdev = rrdev;
937 rrdev = NULL;
938 }
939
940 if (rdev && test_bit(Faulty, &rdev->flags))
941 rdev = NULL;
942 if (rdev)
943 atomic_inc(&rdev->nr_pending);
944 if (rrdev && test_bit(Faulty, &rrdev->flags))
945 rrdev = NULL;
946 if (rrdev)
947 atomic_inc(&rrdev->nr_pending);
948 rcu_read_unlock();
949
950
951
952
953
954 while ((rw & WRITE) && rdev &&
955 test_bit(WriteErrorSeen, &rdev->flags)) {
956 sector_t first_bad;
957 int bad_sectors;
958 int bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS,
959 &first_bad, &bad_sectors);
960 if (!bad)
961 break;
962
963 if (bad < 0) {
964 set_bit(BlockedBadBlocks, &rdev->flags);
965 if (!conf->mddev->external &&
966 conf->mddev->flags) {
967
968
969
970
971 md_check_recovery(conf->mddev);
972 }
973
974
975
976
977
978 atomic_inc(&rdev->nr_pending);
979 md_wait_for_blocked_rdev(rdev, conf->mddev);
980 } else {
981
982 rdev_dec_pending(rdev, conf->mddev);
983 rdev = NULL;
984 }
985 }
986
987 if (rdev) {
988 if (s->syncing || s->expanding || s->expanded
989 || s->replacing)
990 md_sync_acct(rdev->bdev, STRIPE_SECTORS);
991
992 set_bit(STRIPE_IO_STARTED, &sh->state);
993
994 bio_reset(bi);
995 bi->bi_bdev = rdev->bdev;
996 bi->bi_rw = rw;
997 bi->bi_end_io = (rw & WRITE)
998 ? raid5_end_write_request
999 : raid5_end_read_request;
1000 bi->bi_private = sh;
1001
1002 pr_debug("%s: for %llu schedule op %ld on disc %d\n",
1003 __func__, (unsigned long long)sh->sector,
1004 bi->bi_rw, i);
1005 atomic_inc(&sh->count);
1006 if (sh != head_sh)
1007 atomic_inc(&head_sh->count);
1008 if (use_new_offset(conf, sh))
1009 bi->bi_iter.bi_sector = (sh->sector
1010 + rdev->new_data_offset);
1011 else
1012 bi->bi_iter.bi_sector = (sh->sector
1013 + rdev->data_offset);
1014 if (test_bit(R5_ReadNoMerge, &head_sh->dev[i].flags))
1015 bi->bi_rw |= REQ_NOMERGE;
1016
1017 if (test_bit(R5_SkipCopy, &sh->dev[i].flags))
1018 WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags));
1019 sh->dev[i].vec.bv_page = sh->dev[i].page;
1020 bi->bi_vcnt = 1;
1021 bi->bi_io_vec[0].bv_len = STRIPE_SIZE;
1022 bi->bi_io_vec[0].bv_offset = 0;
1023 bi->bi_iter.bi_size = STRIPE_SIZE;
1024
1025
1026
1027
1028 if (rw & REQ_DISCARD)
1029 bi->bi_vcnt = 0;
1030 if (rrdev)
1031 set_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags);
1032
1033 if (conf->mddev->gendisk)
1034 trace_block_bio_remap(bdev_get_queue(bi->bi_bdev),
1035 bi, disk_devt(conf->mddev->gendisk),
1036 sh->dev[i].sector);
1037 generic_make_request(bi);
1038 }
1039 if (rrdev) {
1040 if (s->syncing || s->expanding || s->expanded
1041 || s->replacing)
1042 md_sync_acct(rrdev->bdev, STRIPE_SECTORS);
1043
1044 set_bit(STRIPE_IO_STARTED, &sh->state);
1045
1046 bio_reset(rbi);
1047 rbi->bi_bdev = rrdev->bdev;
1048 rbi->bi_rw = rw;
1049 BUG_ON(!(rw & WRITE));
1050 rbi->bi_end_io = raid5_end_write_request;
1051 rbi->bi_private = sh;
1052
1053 pr_debug("%s: for %llu schedule op %ld on "
1054 "replacement disc %d\n",
1055 __func__, (unsigned long long)sh->sector,
1056 rbi->bi_rw, i);
1057 atomic_inc(&sh->count);
1058 if (sh != head_sh)
1059 atomic_inc(&head_sh->count);
1060 if (use_new_offset(conf, sh))
1061 rbi->bi_iter.bi_sector = (sh->sector
1062 + rrdev->new_data_offset);
1063 else
1064 rbi->bi_iter.bi_sector = (sh->sector
1065 + rrdev->data_offset);
1066 if (test_bit(R5_SkipCopy, &sh->dev[i].flags))
1067 WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags));
1068 sh->dev[i].rvec.bv_page = sh->dev[i].page;
1069 rbi->bi_vcnt = 1;
1070 rbi->bi_io_vec[0].bv_len = STRIPE_SIZE;
1071 rbi->bi_io_vec[0].bv_offset = 0;
1072 rbi->bi_iter.bi_size = STRIPE_SIZE;
1073
1074
1075
1076
1077 if (rw & REQ_DISCARD)
1078 rbi->bi_vcnt = 0;
1079 if (conf->mddev->gendisk)
1080 trace_block_bio_remap(bdev_get_queue(rbi->bi_bdev),
1081 rbi, disk_devt(conf->mddev->gendisk),
1082 sh->dev[i].sector);
1083 generic_make_request(rbi);
1084 }
1085 if (!rdev && !rrdev) {
1086 if (rw & WRITE)
1087 set_bit(STRIPE_DEGRADED, &sh->state);
1088 pr_debug("skip op %ld on disc %d for sector %llu\n",
1089 bi->bi_rw, i, (unsigned long long)sh->sector);
1090 clear_bit(R5_LOCKED, &sh->dev[i].flags);
1091 set_bit(STRIPE_HANDLE, &sh->state);
1092 }
1093
1094 if (!head_sh->batch_head)
1095 continue;
1096 sh = list_first_entry(&sh->batch_list, struct stripe_head,
1097 batch_list);
1098 if (sh != head_sh)
1099 goto again;
1100 }
1101}
1102
1103static struct dma_async_tx_descriptor *
1104async_copy_data(int frombio, struct bio *bio, struct page **page,
1105 sector_t sector, struct dma_async_tx_descriptor *tx,
1106 struct stripe_head *sh)
1107{
1108 struct bio_vec bvl;
1109 struct bvec_iter iter;
1110 struct page *bio_page;
1111 int page_offset;
1112 struct async_submit_ctl submit;
1113 enum async_tx_flags flags = 0;
1114
1115 if (bio->bi_iter.bi_sector >= sector)
1116 page_offset = (signed)(bio->bi_iter.bi_sector - sector) * 512;
1117 else
1118 page_offset = (signed)(sector - bio->bi_iter.bi_sector) * -512;
1119
1120 if (frombio)
1121 flags |= ASYNC_TX_FENCE;
1122 init_async_submit(&submit, flags, tx, NULL, NULL, NULL);
1123
1124 bio_for_each_segment(bvl, bio, iter) {
1125 int len = bvl.bv_len;
1126 int clen;
1127 int b_offset = 0;
1128
1129 if (page_offset < 0) {
1130 b_offset = -page_offset;
1131 page_offset += b_offset;
1132 len -= b_offset;
1133 }
1134
1135 if (len > 0 && page_offset + len > STRIPE_SIZE)
1136 clen = STRIPE_SIZE - page_offset;
1137 else
1138 clen = len;
1139
1140 if (clen > 0) {
1141 b_offset += bvl.bv_offset;
1142 bio_page = bvl.bv_page;
1143 if (frombio) {
1144 if (sh->raid_conf->skip_copy &&
1145 b_offset == 0 && page_offset == 0 &&
1146 clen == STRIPE_SIZE)
1147 *page = bio_page;
1148 else
1149 tx = async_memcpy(*page, bio_page, page_offset,
1150 b_offset, clen, &submit);
1151 } else
1152 tx = async_memcpy(bio_page, *page, b_offset,
1153 page_offset, clen, &submit);
1154 }
1155
1156 submit.depend_tx = tx;
1157
1158 if (clen < len)
1159 break;
1160 page_offset += len;
1161 }
1162
1163 return tx;
1164}
1165
1166static void ops_complete_biofill(void *stripe_head_ref)
1167{
1168 struct stripe_head *sh = stripe_head_ref;
1169 struct bio *return_bi = NULL;
1170 int i;
1171
1172 pr_debug("%s: stripe %llu\n", __func__,
1173 (unsigned long long)sh->sector);
1174
1175
1176 for (i = sh->disks; i--; ) {
1177 struct r5dev *dev = &sh->dev[i];
1178
1179
1180
1181
1182
1183
1184 if (test_and_clear_bit(R5_Wantfill, &dev->flags)) {
1185 struct bio *rbi, *rbi2;
1186
1187 BUG_ON(!dev->read);
1188 rbi = dev->read;
1189 dev->read = NULL;
1190 while (rbi && rbi->bi_iter.bi_sector <
1191 dev->sector + STRIPE_SECTORS) {
1192 rbi2 = r5_next_bio(rbi, dev->sector);
1193 if (!raid5_dec_bi_active_stripes(rbi)) {
1194 rbi->bi_next = return_bi;
1195 return_bi = rbi;
1196 }
1197 rbi = rbi2;
1198 }
1199 }
1200 }
1201 clear_bit(STRIPE_BIOFILL_RUN, &sh->state);
1202
1203 return_io(return_bi);
1204
1205 set_bit(STRIPE_HANDLE, &sh->state);
1206 release_stripe(sh);
1207}
1208
1209static void ops_run_biofill(struct stripe_head *sh)
1210{
1211 struct dma_async_tx_descriptor *tx = NULL;
1212 struct async_submit_ctl submit;
1213 int i;
1214
1215 BUG_ON(sh->batch_head);
1216 pr_debug("%s: stripe %llu\n", __func__,
1217 (unsigned long long)sh->sector);
1218
1219 for (i = sh->disks; i--; ) {
1220 struct r5dev *dev = &sh->dev[i];
1221 if (test_bit(R5_Wantfill, &dev->flags)) {
1222 struct bio *rbi;
1223 spin_lock_irq(&sh->stripe_lock);
1224 dev->read = rbi = dev->toread;
1225 dev->toread = NULL;
1226 spin_unlock_irq(&sh->stripe_lock);
1227 while (rbi && rbi->bi_iter.bi_sector <
1228 dev->sector + STRIPE_SECTORS) {
1229 tx = async_copy_data(0, rbi, &dev->page,
1230 dev->sector, tx, sh);
1231 rbi = r5_next_bio(rbi, dev->sector);
1232 }
1233 }
1234 }
1235
1236 atomic_inc(&sh->count);
1237 init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_biofill, sh, NULL);
1238 async_trigger_callback(&submit);
1239}
1240
1241static void mark_target_uptodate(struct stripe_head *sh, int target)
1242{
1243 struct r5dev *tgt;
1244
1245 if (target < 0)
1246 return;
1247
1248 tgt = &sh->dev[target];
1249 set_bit(R5_UPTODATE, &tgt->flags);
1250 BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags));
1251 clear_bit(R5_Wantcompute, &tgt->flags);
1252}
1253
1254static void ops_complete_compute(void *stripe_head_ref)
1255{
1256 struct stripe_head *sh = stripe_head_ref;
1257
1258 pr_debug("%s: stripe %llu\n", __func__,
1259 (unsigned long long)sh->sector);
1260
1261
1262 mark_target_uptodate(sh, sh->ops.target);
1263 mark_target_uptodate(sh, sh->ops.target2);
1264
1265 clear_bit(STRIPE_COMPUTE_RUN, &sh->state);
1266 if (sh->check_state == check_state_compute_run)
1267 sh->check_state = check_state_compute_result;
1268 set_bit(STRIPE_HANDLE, &sh->state);
1269 release_stripe(sh);
1270}
1271
1272
1273static addr_conv_t *to_addr_conv(struct stripe_head *sh,
1274 struct raid5_percpu *percpu, int i)
1275{
1276 void *addr;
1277
1278 addr = flex_array_get(percpu->scribble, i);
1279 return addr + sizeof(struct page *) * (sh->disks + 2);
1280}
1281
1282
1283static struct page **to_addr_page(struct raid5_percpu *percpu, int i)
1284{
1285 void *addr;
1286
1287 addr = flex_array_get(percpu->scribble, i);
1288 return addr;
1289}
1290
1291static struct dma_async_tx_descriptor *
1292ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu)
1293{
1294 int disks = sh->disks;
1295 struct page **xor_srcs = to_addr_page(percpu, 0);
1296 int target = sh->ops.target;
1297 struct r5dev *tgt = &sh->dev[target];
1298 struct page *xor_dest = tgt->page;
1299 int count = 0;
1300 struct dma_async_tx_descriptor *tx;
1301 struct async_submit_ctl submit;
1302 int i;
1303
1304 BUG_ON(sh->batch_head);
1305
1306 pr_debug("%s: stripe %llu block: %d\n",
1307 __func__, (unsigned long long)sh->sector, target);
1308 BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags));
1309
1310 for (i = disks; i--; )
1311 if (i != target)
1312 xor_srcs[count++] = sh->dev[i].page;
1313
1314 atomic_inc(&sh->count);
1315
1316 init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, NULL,
1317 ops_complete_compute, sh, to_addr_conv(sh, percpu, 0));
1318 if (unlikely(count == 1))
1319 tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit);
1320 else
1321 tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit);
1322
1323 return tx;
1324}
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335static int set_syndrome_sources(struct page **srcs,
1336 struct stripe_head *sh,
1337 int srctype)
1338{
1339 int disks = sh->disks;
1340 int syndrome_disks = sh->ddf_layout ? disks : (disks - 2);
1341 int d0_idx = raid6_d0(sh);
1342 int count;
1343 int i;
1344
1345 for (i = 0; i < disks; i++)
1346 srcs[i] = NULL;
1347
1348 count = 0;
1349 i = d0_idx;
1350 do {
1351 int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks);
1352 struct r5dev *dev = &sh->dev[i];
1353
1354 if (i == sh->qd_idx || i == sh->pd_idx ||
1355 (srctype == SYNDROME_SRC_ALL) ||
1356 (srctype == SYNDROME_SRC_WANT_DRAIN &&
1357 test_bit(R5_Wantdrain, &dev->flags)) ||
1358 (srctype == SYNDROME_SRC_WRITTEN &&
1359 dev->written))
1360 srcs[slot] = sh->dev[i].page;
1361 i = raid6_next_disk(i, disks);
1362 } while (i != d0_idx);
1363
1364 return syndrome_disks;
1365}
1366
1367static struct dma_async_tx_descriptor *
1368ops_run_compute6_1(struct stripe_head *sh, struct raid5_percpu *percpu)
1369{
1370 int disks = sh->disks;
1371 struct page **blocks = to_addr_page(percpu, 0);
1372 int target;
1373 int qd_idx = sh->qd_idx;
1374 struct dma_async_tx_descriptor *tx;
1375 struct async_submit_ctl submit;
1376 struct r5dev *tgt;
1377 struct page *dest;
1378 int i;
1379 int count;
1380
1381 BUG_ON(sh->batch_head);
1382 if (sh->ops.target < 0)
1383 target = sh->ops.target2;
1384 else if (sh->ops.target2 < 0)
1385 target = sh->ops.target;
1386 else
1387
1388 BUG();
1389 BUG_ON(target < 0);
1390 pr_debug("%s: stripe %llu block: %d\n",
1391 __func__, (unsigned long long)sh->sector, target);
1392
1393 tgt = &sh->dev[target];
1394 BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags));
1395 dest = tgt->page;
1396
1397 atomic_inc(&sh->count);
1398
1399 if (target == qd_idx) {
1400 count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_ALL);
1401 blocks[count] = NULL;
1402 BUG_ON(blocks[count+1] != dest);
1403 init_async_submit(&submit, ASYNC_TX_FENCE, NULL,
1404 ops_complete_compute, sh,
1405 to_addr_conv(sh, percpu, 0));
1406 tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit);
1407 } else {
1408
1409 count = 0;
1410 for (i = disks; i-- ; ) {
1411 if (i == target || i == qd_idx)
1412 continue;
1413 blocks[count++] = sh->dev[i].page;
1414 }
1415
1416 init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST,
1417 NULL, ops_complete_compute, sh,
1418 to_addr_conv(sh, percpu, 0));
1419 tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, &submit);
1420 }
1421
1422 return tx;
1423}
1424
1425static struct dma_async_tx_descriptor *
1426ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu)
1427{
1428 int i, count, disks = sh->disks;
1429 int syndrome_disks = sh->ddf_layout ? disks : disks-2;
1430 int d0_idx = raid6_d0(sh);
1431 int faila = -1, failb = -1;
1432 int target = sh->ops.target;
1433 int target2 = sh->ops.target2;
1434 struct r5dev *tgt = &sh->dev[target];
1435 struct r5dev *tgt2 = &sh->dev[target2];
1436 struct dma_async_tx_descriptor *tx;
1437 struct page **blocks = to_addr_page(percpu, 0);
1438 struct async_submit_ctl submit;
1439
1440 BUG_ON(sh->batch_head);
1441 pr_debug("%s: stripe %llu block1: %d block2: %d\n",
1442 __func__, (unsigned long long)sh->sector, target, target2);
1443 BUG_ON(target < 0 || target2 < 0);
1444 BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags));
1445 BUG_ON(!test_bit(R5_Wantcompute, &tgt2->flags));
1446
1447
1448
1449
1450 for (i = 0; i < disks ; i++)
1451 blocks[i] = NULL;
1452 count = 0;
1453 i = d0_idx;
1454 do {
1455 int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks);
1456
1457 blocks[slot] = sh->dev[i].page;
1458
1459 if (i == target)
1460 faila = slot;
1461 if (i == target2)
1462 failb = slot;
1463 i = raid6_next_disk(i, disks);
1464 } while (i != d0_idx);
1465
1466 BUG_ON(faila == failb);
1467 if (failb < faila)
1468 swap(faila, failb);
1469 pr_debug("%s: stripe: %llu faila: %d failb: %d\n",
1470 __func__, (unsigned long long)sh->sector, faila, failb);
1471
1472 atomic_inc(&sh->count);
1473
1474 if (failb == syndrome_disks+1) {
1475
1476 if (faila == syndrome_disks) {
1477
1478 init_async_submit(&submit, ASYNC_TX_FENCE, NULL,
1479 ops_complete_compute, sh,
1480 to_addr_conv(sh, percpu, 0));
1481 return async_gen_syndrome(blocks, 0, syndrome_disks+2,
1482 STRIPE_SIZE, &submit);
1483 } else {
1484 struct page *dest;
1485 int data_target;
1486 int qd_idx = sh->qd_idx;
1487
1488
1489 if (target == qd_idx)
1490 data_target = target2;
1491 else
1492 data_target = target;
1493
1494 count = 0;
1495 for (i = disks; i-- ; ) {
1496 if (i == data_target || i == qd_idx)
1497 continue;
1498 blocks[count++] = sh->dev[i].page;
1499 }
1500 dest = sh->dev[data_target].page;
1501 init_async_submit(&submit,
1502 ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST,
1503 NULL, NULL, NULL,
1504 to_addr_conv(sh, percpu, 0));
1505 tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE,
1506 &submit);
1507
1508 count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_ALL);
1509 init_async_submit(&submit, ASYNC_TX_FENCE, tx,
1510 ops_complete_compute, sh,
1511 to_addr_conv(sh, percpu, 0));
1512 return async_gen_syndrome(blocks, 0, count+2,
1513 STRIPE_SIZE, &submit);
1514 }
1515 } else {
1516 init_async_submit(&submit, ASYNC_TX_FENCE, NULL,
1517 ops_complete_compute, sh,
1518 to_addr_conv(sh, percpu, 0));
1519 if (failb == syndrome_disks) {
1520
1521 return async_raid6_datap_recov(syndrome_disks+2,
1522 STRIPE_SIZE, faila,
1523 blocks, &submit);
1524 } else {
1525
1526 return async_raid6_2data_recov(syndrome_disks+2,
1527 STRIPE_SIZE, faila, failb,
1528 blocks, &submit);
1529 }
1530 }
1531}
1532
1533static void ops_complete_prexor(void *stripe_head_ref)
1534{
1535 struct stripe_head *sh = stripe_head_ref;
1536
1537 pr_debug("%s: stripe %llu\n", __func__,
1538 (unsigned long long)sh->sector);
1539}
1540
1541static struct dma_async_tx_descriptor *
1542ops_run_prexor5(struct stripe_head *sh, struct raid5_percpu *percpu,
1543 struct dma_async_tx_descriptor *tx)
1544{
1545 int disks = sh->disks;
1546 struct page **xor_srcs = to_addr_page(percpu, 0);
1547 int count = 0, pd_idx = sh->pd_idx, i;
1548 struct async_submit_ctl submit;
1549
1550
1551 struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page;
1552
1553 BUG_ON(sh->batch_head);
1554 pr_debug("%s: stripe %llu\n", __func__,
1555 (unsigned long long)sh->sector);
1556
1557 for (i = disks; i--; ) {
1558 struct r5dev *dev = &sh->dev[i];
1559
1560 if (test_bit(R5_Wantdrain, &dev->flags))
1561 xor_srcs[count++] = dev->page;
1562 }
1563
1564 init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx,
1565 ops_complete_prexor, sh, to_addr_conv(sh, percpu, 0));
1566 tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit);
1567
1568 return tx;
1569}
1570
1571static struct dma_async_tx_descriptor *
1572ops_run_prexor6(struct stripe_head *sh, struct raid5_percpu *percpu,
1573 struct dma_async_tx_descriptor *tx)
1574{
1575 struct page **blocks = to_addr_page(percpu, 0);
1576 int count;
1577 struct async_submit_ctl submit;
1578
1579 pr_debug("%s: stripe %llu\n", __func__,
1580 (unsigned long long)sh->sector);
1581
1582 count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_WANT_DRAIN);
1583
1584 init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_PQ_XOR_DST, tx,
1585 ops_complete_prexor, sh, to_addr_conv(sh, percpu, 0));
1586 tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit);
1587
1588 return tx;
1589}
1590
1591static struct dma_async_tx_descriptor *
1592ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx)
1593{
1594 int disks = sh->disks;
1595 int i;
1596 struct stripe_head *head_sh = sh;
1597
1598 pr_debug("%s: stripe %llu\n", __func__,
1599 (unsigned long long)sh->sector);
1600
1601 for (i = disks; i--; ) {
1602 struct r5dev *dev;
1603 struct bio *chosen;
1604
1605 sh = head_sh;
1606 if (test_and_clear_bit(R5_Wantdrain, &head_sh->dev[i].flags)) {
1607 struct bio *wbi;
1608
1609again:
1610 dev = &sh->dev[i];
1611 spin_lock_irq(&sh->stripe_lock);
1612 chosen = dev->towrite;
1613 dev->towrite = NULL;
1614 sh->overwrite_disks = 0;
1615 BUG_ON(dev->written);
1616 wbi = dev->written = chosen;
1617 spin_unlock_irq(&sh->stripe_lock);
1618 WARN_ON(dev->page != dev->orig_page);
1619
1620 while (wbi && wbi->bi_iter.bi_sector <
1621 dev->sector + STRIPE_SECTORS) {
1622 if (wbi->bi_rw & REQ_FUA)
1623 set_bit(R5_WantFUA, &dev->flags);
1624 if (wbi->bi_rw & REQ_SYNC)
1625 set_bit(R5_SyncIO, &dev->flags);
1626 if (wbi->bi_rw & REQ_DISCARD)
1627 set_bit(R5_Discard, &dev->flags);
1628 else {
1629 tx = async_copy_data(1, wbi, &dev->page,
1630 dev->sector, tx, sh);
1631 if (dev->page != dev->orig_page) {
1632 set_bit(R5_SkipCopy, &dev->flags);
1633 clear_bit(R5_UPTODATE, &dev->flags);
1634 clear_bit(R5_OVERWRITE, &dev->flags);
1635 }
1636 }
1637 wbi = r5_next_bio(wbi, dev->sector);
1638 }
1639
1640 if (head_sh->batch_head) {
1641 sh = list_first_entry(&sh->batch_list,
1642 struct stripe_head,
1643 batch_list);
1644 if (sh == head_sh)
1645 continue;
1646 goto again;
1647 }
1648 }
1649 }
1650
1651 return tx;
1652}
1653
1654static void ops_complete_reconstruct(void *stripe_head_ref)
1655{
1656 struct stripe_head *sh = stripe_head_ref;
1657 int disks = sh->disks;
1658 int pd_idx = sh->pd_idx;
1659 int qd_idx = sh->qd_idx;
1660 int i;
1661 bool fua = false, sync = false, discard = false;
1662
1663 pr_debug("%s: stripe %llu\n", __func__,
1664 (unsigned long long)sh->sector);
1665
1666 for (i = disks; i--; ) {
1667 fua |= test_bit(R5_WantFUA, &sh->dev[i].flags);
1668 sync |= test_bit(R5_SyncIO, &sh->dev[i].flags);
1669 discard |= test_bit(R5_Discard, &sh->dev[i].flags);
1670 }
1671
1672 for (i = disks; i--; ) {
1673 struct r5dev *dev = &sh->dev[i];
1674
1675 if (dev->written || i == pd_idx || i == qd_idx) {
1676 if (!discard && !test_bit(R5_SkipCopy, &dev->flags))
1677 set_bit(R5_UPTODATE, &dev->flags);
1678 if (fua)
1679 set_bit(R5_WantFUA, &dev->flags);
1680 if (sync)
1681 set_bit(R5_SyncIO, &dev->flags);
1682 }
1683 }
1684
1685 if (sh->reconstruct_state == reconstruct_state_drain_run)
1686 sh->reconstruct_state = reconstruct_state_drain_result;
1687 else if (sh->reconstruct_state == reconstruct_state_prexor_drain_run)
1688 sh->reconstruct_state = reconstruct_state_prexor_drain_result;
1689 else {
1690 BUG_ON(sh->reconstruct_state != reconstruct_state_run);
1691 sh->reconstruct_state = reconstruct_state_result;
1692 }
1693
1694 set_bit(STRIPE_HANDLE, &sh->state);
1695 release_stripe(sh);
1696}
1697
1698static void
1699ops_run_reconstruct5(struct stripe_head *sh, struct raid5_percpu *percpu,
1700 struct dma_async_tx_descriptor *tx)
1701{
1702 int disks = sh->disks;
1703 struct page **xor_srcs;
1704 struct async_submit_ctl submit;
1705 int count, pd_idx = sh->pd_idx, i;
1706 struct page *xor_dest;
1707 int prexor = 0;
1708 unsigned long flags;
1709 int j = 0;
1710 struct stripe_head *head_sh = sh;
1711 int last_stripe;
1712
1713 pr_debug("%s: stripe %llu\n", __func__,
1714 (unsigned long long)sh->sector);
1715
1716 for (i = 0; i < sh->disks; i++) {
1717 if (pd_idx == i)
1718 continue;
1719 if (!test_bit(R5_Discard, &sh->dev[i].flags))
1720 break;
1721 }
1722 if (i >= sh->disks) {
1723 atomic_inc(&sh->count);
1724 set_bit(R5_Discard, &sh->dev[pd_idx].flags);
1725 ops_complete_reconstruct(sh);
1726 return;
1727 }
1728again:
1729 count = 0;
1730 xor_srcs = to_addr_page(percpu, j);
1731
1732
1733
1734 if (head_sh->reconstruct_state == reconstruct_state_prexor_drain_run) {
1735 prexor = 1;
1736 xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page;
1737 for (i = disks; i--; ) {
1738 struct r5dev *dev = &sh->dev[i];
1739 if (head_sh->dev[i].written)
1740 xor_srcs[count++] = dev->page;
1741 }
1742 } else {
1743 xor_dest = sh->dev[pd_idx].page;
1744 for (i = disks; i--; ) {
1745 struct r5dev *dev = &sh->dev[i];
1746 if (i != pd_idx)
1747 xor_srcs[count++] = dev->page;
1748 }
1749 }
1750
1751
1752
1753
1754
1755
1756 last_stripe = !head_sh->batch_head ||
1757 list_first_entry(&sh->batch_list,
1758 struct stripe_head, batch_list) == head_sh;
1759 if (last_stripe) {
1760 flags = ASYNC_TX_ACK |
1761 (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST);
1762
1763 atomic_inc(&head_sh->count);
1764 init_async_submit(&submit, flags, tx, ops_complete_reconstruct, head_sh,
1765 to_addr_conv(sh, percpu, j));
1766 } else {
1767 flags = prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST;
1768 init_async_submit(&submit, flags, tx, NULL, NULL,
1769 to_addr_conv(sh, percpu, j));
1770 }
1771
1772 if (unlikely(count == 1))
1773 tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit);
1774 else
1775 tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit);
1776 if (!last_stripe) {
1777 j++;
1778 sh = list_first_entry(&sh->batch_list, struct stripe_head,
1779 batch_list);
1780 goto again;
1781 }
1782}
1783
1784static void
1785ops_run_reconstruct6(struct stripe_head *sh, struct raid5_percpu *percpu,
1786 struct dma_async_tx_descriptor *tx)
1787{
1788 struct async_submit_ctl submit;
1789 struct page **blocks;
1790 int count, i, j = 0;
1791 struct stripe_head *head_sh = sh;
1792 int last_stripe;
1793 int synflags;
1794 unsigned long txflags;
1795
1796 pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector);
1797
1798 for (i = 0; i < sh->disks; i++) {
1799 if (sh->pd_idx == i || sh->qd_idx == i)
1800 continue;
1801 if (!test_bit(R5_Discard, &sh->dev[i].flags))
1802 break;
1803 }
1804 if (i >= sh->disks) {
1805 atomic_inc(&sh->count);
1806 set_bit(R5_Discard, &sh->dev[sh->pd_idx].flags);
1807 set_bit(R5_Discard, &sh->dev[sh->qd_idx].flags);
1808 ops_complete_reconstruct(sh);
1809 return;
1810 }
1811
1812again:
1813 blocks = to_addr_page(percpu, j);
1814
1815 if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) {
1816 synflags = SYNDROME_SRC_WRITTEN;
1817 txflags = ASYNC_TX_ACK | ASYNC_TX_PQ_XOR_DST;
1818 } else {
1819 synflags = SYNDROME_SRC_ALL;
1820 txflags = ASYNC_TX_ACK;
1821 }
1822
1823 count = set_syndrome_sources(blocks, sh, synflags);
1824 last_stripe = !head_sh->batch_head ||
1825 list_first_entry(&sh->batch_list,
1826 struct stripe_head, batch_list) == head_sh;
1827
1828 if (last_stripe) {
1829 atomic_inc(&head_sh->count);
1830 init_async_submit(&submit, txflags, tx, ops_complete_reconstruct,
1831 head_sh, to_addr_conv(sh, percpu, j));
1832 } else
1833 init_async_submit(&submit, 0, tx, NULL, NULL,
1834 to_addr_conv(sh, percpu, j));
1835 tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit);
1836 if (!last_stripe) {
1837 j++;
1838 sh = list_first_entry(&sh->batch_list, struct stripe_head,
1839 batch_list);
1840 goto again;
1841 }
1842}
1843
1844static void ops_complete_check(void *stripe_head_ref)
1845{
1846 struct stripe_head *sh = stripe_head_ref;
1847
1848 pr_debug("%s: stripe %llu\n", __func__,
1849 (unsigned long long)sh->sector);
1850
1851 sh->check_state = check_state_check_result;
1852 set_bit(STRIPE_HANDLE, &sh->state);
1853 release_stripe(sh);
1854}
1855
1856static void ops_run_check_p(struct stripe_head *sh, struct raid5_percpu *percpu)
1857{
1858 int disks = sh->disks;
1859 int pd_idx = sh->pd_idx;
1860 int qd_idx = sh->qd_idx;
1861 struct page *xor_dest;
1862 struct page **xor_srcs = to_addr_page(percpu, 0);
1863 struct dma_async_tx_descriptor *tx;
1864 struct async_submit_ctl submit;
1865 int count;
1866 int i;
1867
1868 pr_debug("%s: stripe %llu\n", __func__,
1869 (unsigned long long)sh->sector);
1870
1871 BUG_ON(sh->batch_head);
1872 count = 0;
1873 xor_dest = sh->dev[pd_idx].page;
1874 xor_srcs[count++] = xor_dest;
1875 for (i = disks; i--; ) {
1876 if (i == pd_idx || i == qd_idx)
1877 continue;
1878 xor_srcs[count++] = sh->dev[i].page;
1879 }
1880
1881 init_async_submit(&submit, 0, NULL, NULL, NULL,
1882 to_addr_conv(sh, percpu, 0));
1883 tx = async_xor_val(xor_dest, xor_srcs, 0, count, STRIPE_SIZE,
1884 &sh->ops.zero_sum_result, &submit);
1885
1886 atomic_inc(&sh->count);
1887 init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_check, sh, NULL);
1888 tx = async_trigger_callback(&submit);
1889}
1890
1891static void ops_run_check_pq(struct stripe_head *sh, struct raid5_percpu *percpu, int checkp)
1892{
1893 struct page **srcs = to_addr_page(percpu, 0);
1894 struct async_submit_ctl submit;
1895 int count;
1896
1897 pr_debug("%s: stripe %llu checkp: %d\n", __func__,
1898 (unsigned long long)sh->sector, checkp);
1899
1900 BUG_ON(sh->batch_head);
1901 count = set_syndrome_sources(srcs, sh, SYNDROME_SRC_ALL);
1902 if (!checkp)
1903 srcs[count] = NULL;
1904
1905 atomic_inc(&sh->count);
1906 init_async_submit(&submit, ASYNC_TX_ACK, NULL, ops_complete_check,
1907 sh, to_addr_conv(sh, percpu, 0));
1908 async_syndrome_val(srcs, 0, count+2, STRIPE_SIZE,
1909 &sh->ops.zero_sum_result, percpu->spare_page, &submit);
1910}
1911
1912static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request)
1913{
1914 int overlap_clear = 0, i, disks = sh->disks;
1915 struct dma_async_tx_descriptor *tx = NULL;
1916 struct r5conf *conf = sh->raid_conf;
1917 int level = conf->level;
1918 struct raid5_percpu *percpu;
1919 unsigned long cpu;
1920
1921 cpu = get_cpu();
1922 percpu = per_cpu_ptr(conf->percpu, cpu);
1923 if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) {
1924 ops_run_biofill(sh);
1925 overlap_clear++;
1926 }
1927
1928 if (test_bit(STRIPE_OP_COMPUTE_BLK, &ops_request)) {
1929 if (level < 6)
1930 tx = ops_run_compute5(sh, percpu);
1931 else {
1932 if (sh->ops.target2 < 0 || sh->ops.target < 0)
1933 tx = ops_run_compute6_1(sh, percpu);
1934 else
1935 tx = ops_run_compute6_2(sh, percpu);
1936 }
1937
1938 if (tx && !test_bit(STRIPE_OP_RECONSTRUCT, &ops_request))
1939 async_tx_ack(tx);
1940 }
1941
1942 if (test_bit(STRIPE_OP_PREXOR, &ops_request)) {
1943 if (level < 6)
1944 tx = ops_run_prexor5(sh, percpu, tx);
1945 else
1946 tx = ops_run_prexor6(sh, percpu, tx);
1947 }
1948
1949 if (test_bit(STRIPE_OP_BIODRAIN, &ops_request)) {
1950 tx = ops_run_biodrain(sh, tx);
1951 overlap_clear++;
1952 }
1953
1954 if (test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) {
1955 if (level < 6)
1956 ops_run_reconstruct5(sh, percpu, tx);
1957 else
1958 ops_run_reconstruct6(sh, percpu, tx);
1959 }
1960
1961 if (test_bit(STRIPE_OP_CHECK, &ops_request)) {
1962 if (sh->check_state == check_state_run)
1963 ops_run_check_p(sh, percpu);
1964 else if (sh->check_state == check_state_run_q)
1965 ops_run_check_pq(sh, percpu, 0);
1966 else if (sh->check_state == check_state_run_pq)
1967 ops_run_check_pq(sh, percpu, 1);
1968 else
1969 BUG();
1970 }
1971
1972 if (overlap_clear && !sh->batch_head)
1973 for (i = disks; i--; ) {
1974 struct r5dev *dev = &sh->dev[i];
1975 if (test_and_clear_bit(R5_Overlap, &dev->flags))
1976 wake_up(&sh->raid_conf->wait_for_overlap);
1977 }
1978 put_cpu();
1979}
1980
1981static struct stripe_head *alloc_stripe(struct kmem_cache *sc, gfp_t gfp)
1982{
1983 struct stripe_head *sh;
1984
1985 sh = kmem_cache_zalloc(sc, gfp);
1986 if (sh) {
1987 spin_lock_init(&sh->stripe_lock);
1988 spin_lock_init(&sh->batch_lock);
1989 INIT_LIST_HEAD(&sh->batch_list);
1990 INIT_LIST_HEAD(&sh->lru);
1991 atomic_set(&sh->count, 1);
1992 }
1993 return sh;
1994}
1995static int grow_one_stripe(struct r5conf *conf, gfp_t gfp)
1996{
1997 struct stripe_head *sh;
1998
1999 sh = alloc_stripe(conf->slab_cache, gfp);
2000 if (!sh)
2001 return 0;
2002
2003 sh->raid_conf = conf;
2004
2005 if (grow_buffers(sh, gfp)) {
2006 shrink_buffers(sh);
2007 kmem_cache_free(conf->slab_cache, sh);
2008 return 0;
2009 }
2010 sh->hash_lock_index =
2011 conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS;
2012
2013 atomic_inc(&conf->active_stripes);
2014
2015 release_stripe(sh);
2016 conf->max_nr_stripes++;
2017 return 1;
2018}
2019
2020static int grow_stripes(struct r5conf *conf, int num)
2021{
2022 struct kmem_cache *sc;
2023 int devs = max(conf->raid_disks, conf->previous_raid_disks);
2024
2025 if (conf->mddev->gendisk)
2026 sprintf(conf->cache_name[0],
2027 "raid%d-%s", conf->level, mdname(conf->mddev));
2028 else
2029 sprintf(conf->cache_name[0],
2030 "raid%d-%p", conf->level, conf->mddev);
2031 sprintf(conf->cache_name[1], "%s-alt", conf->cache_name[0]);
2032
2033 conf->active_name = 0;
2034 sc = kmem_cache_create(conf->cache_name[conf->active_name],
2035 sizeof(struct stripe_head)+(devs-1)*sizeof(struct r5dev),
2036 0, 0, NULL);
2037 if (!sc)
2038 return 1;
2039 conf->slab_cache = sc;
2040 conf->pool_size = devs;
2041 while (num--)
2042 if (!grow_one_stripe(conf, GFP_KERNEL))
2043 return 1;
2044
2045 return 0;
2046}
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061static struct flex_array *scribble_alloc(int num, int cnt, gfp_t flags)
2062{
2063 struct flex_array *ret;
2064 size_t len;
2065
2066 len = sizeof(struct page *) * (num+2) + sizeof(addr_conv_t) * (num+2);
2067 ret = flex_array_alloc(len, cnt, flags);
2068 if (!ret)
2069 return NULL;
2070
2071 if (flex_array_prealloc(ret, 0, cnt, flags)) {
2072 flex_array_free(ret);
2073 return NULL;
2074 }
2075 return ret;
2076}
2077
2078static int resize_chunks(struct r5conf *conf, int new_disks, int new_sectors)
2079{
2080 unsigned long cpu;
2081 int err = 0;
2082
2083 mddev_suspend(conf->mddev);
2084 get_online_cpus();
2085 for_each_present_cpu(cpu) {
2086 struct raid5_percpu *percpu;
2087 struct flex_array *scribble;
2088
2089 percpu = per_cpu_ptr(conf->percpu, cpu);
2090 scribble = scribble_alloc(new_disks,
2091 new_sectors / STRIPE_SECTORS,
2092 GFP_NOIO);
2093
2094 if (scribble) {
2095 flex_array_free(percpu->scribble);
2096 percpu->scribble = scribble;
2097 } else {
2098 err = -ENOMEM;
2099 break;
2100 }
2101 }
2102 put_online_cpus();
2103 mddev_resume(conf->mddev);
2104 return err;
2105}
2106
2107static int resize_stripes(struct r5conf *conf, int newsize)
2108{
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132 struct stripe_head *osh, *nsh;
2133 LIST_HEAD(newstripes);
2134 struct disk_info *ndisks;
2135 int err;
2136 struct kmem_cache *sc;
2137 int i;
2138 int hash, cnt;
2139
2140 if (newsize <= conf->pool_size)
2141 return 0;
2142
2143 err = md_allow_write(conf->mddev);
2144 if (err)
2145 return err;
2146
2147
2148 sc = kmem_cache_create(conf->cache_name[1-conf->active_name],
2149 sizeof(struct stripe_head)+(newsize-1)*sizeof(struct r5dev),
2150 0, 0, NULL);
2151 if (!sc)
2152 return -ENOMEM;
2153
2154 for (i = conf->max_nr_stripes; i; i--) {
2155 nsh = alloc_stripe(sc, GFP_KERNEL);
2156 if (!nsh)
2157 break;
2158
2159 nsh->raid_conf = conf;
2160 list_add(&nsh->lru, &newstripes);
2161 }
2162 if (i) {
2163
2164 while (!list_empty(&newstripes)) {
2165 nsh = list_entry(newstripes.next, struct stripe_head, lru);
2166 list_del(&nsh->lru);
2167 kmem_cache_free(sc, nsh);
2168 }
2169 kmem_cache_destroy(sc);
2170 return -ENOMEM;
2171 }
2172
2173
2174
2175
2176 hash = 0;
2177 cnt = 0;
2178 list_for_each_entry(nsh, &newstripes, lru) {
2179 lock_device_hash_lock(conf, hash);
2180 wait_event_cmd(conf->wait_for_stripe,
2181 !list_empty(conf->inactive_list + hash),
2182 unlock_device_hash_lock(conf, hash),
2183 lock_device_hash_lock(conf, hash));
2184 osh = get_free_stripe(conf, hash);
2185 unlock_device_hash_lock(conf, hash);
2186
2187 for(i=0; i<conf->pool_size; i++) {
2188 nsh->dev[i].page = osh->dev[i].page;
2189 nsh->dev[i].orig_page = osh->dev[i].page;
2190 }
2191 nsh->hash_lock_index = hash;
2192 kmem_cache_free(conf->slab_cache, osh);
2193 cnt++;
2194 if (cnt >= conf->max_nr_stripes / NR_STRIPE_HASH_LOCKS +
2195 !!((conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS) > hash)) {
2196 hash++;
2197 cnt = 0;
2198 }
2199 }
2200 kmem_cache_destroy(conf->slab_cache);
2201
2202
2203
2204
2205
2206
2207 ndisks = kzalloc(newsize * sizeof(struct disk_info), GFP_NOIO);
2208 if (ndisks) {
2209 for (i=0; i<conf->raid_disks; i++)
2210 ndisks[i] = conf->disks[i];
2211 kfree(conf->disks);
2212 conf->disks = ndisks;
2213 } else
2214 err = -ENOMEM;
2215
2216
2217 while(!list_empty(&newstripes)) {
2218 nsh = list_entry(newstripes.next, struct stripe_head, lru);
2219 list_del_init(&nsh->lru);
2220
2221 for (i=conf->raid_disks; i < newsize; i++)
2222 if (nsh->dev[i].page == NULL) {
2223 struct page *p = alloc_page(GFP_NOIO);
2224 nsh->dev[i].page = p;
2225 nsh->dev[i].orig_page = p;
2226 if (!p)
2227 err = -ENOMEM;
2228 }
2229 release_stripe(nsh);
2230 }
2231
2232
2233 conf->slab_cache = sc;
2234 conf->active_name = 1-conf->active_name;
2235 if (!err)
2236 conf->pool_size = newsize;
2237 return err;
2238}
2239
2240static int drop_one_stripe(struct r5conf *conf)
2241{
2242 struct stripe_head *sh;
2243 int hash = (conf->max_nr_stripes - 1) % NR_STRIPE_HASH_LOCKS;
2244
2245 spin_lock_irq(conf->hash_locks + hash);
2246 sh = get_free_stripe(conf, hash);
2247 spin_unlock_irq(conf->hash_locks + hash);
2248 if (!sh)
2249 return 0;
2250 BUG_ON(atomic_read(&sh->count));
2251 shrink_buffers(sh);
2252 kmem_cache_free(conf->slab_cache, sh);
2253 atomic_dec(&conf->active_stripes);
2254 conf->max_nr_stripes--;
2255 return 1;
2256}
2257
2258static void shrink_stripes(struct r5conf *conf)
2259{
2260 while (conf->max_nr_stripes &&
2261 drop_one_stripe(conf))
2262 ;
2263
2264 if (conf->slab_cache)
2265 kmem_cache_destroy(conf->slab_cache);
2266 conf->slab_cache = NULL;
2267}
2268
2269static void raid5_end_read_request(struct bio * bi, int error)
2270{
2271 struct stripe_head *sh = bi->bi_private;
2272 struct r5conf *conf = sh->raid_conf;
2273 int disks = sh->disks, i;
2274 int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags);
2275 char b[BDEVNAME_SIZE];
2276 struct md_rdev *rdev = NULL;
2277 sector_t s;
2278
2279 for (i=0 ; i<disks; i++)
2280 if (bi == &sh->dev[i].req)
2281 break;
2282
2283 pr_debug("end_read_request %llu/%d, count: %d, uptodate %d.\n",
2284 (unsigned long long)sh->sector, i, atomic_read(&sh->count),
2285 uptodate);
2286 if (i == disks) {
2287 BUG();
2288 return;
2289 }
2290 if (test_bit(R5_ReadRepl, &sh->dev[i].flags))
2291
2292
2293
2294
2295
2296 rdev = conf->disks[i].replacement;
2297 if (!rdev)
2298 rdev = conf->disks[i].rdev;
2299
2300 if (use_new_offset(conf, sh))
2301 s = sh->sector + rdev->new_data_offset;
2302 else
2303 s = sh->sector + rdev->data_offset;
2304 if (uptodate) {
2305 set_bit(R5_UPTODATE, &sh->dev[i].flags);
2306 if (test_bit(R5_ReadError, &sh->dev[i].flags)) {
2307
2308
2309
2310
2311 printk_ratelimited(
2312 KERN_INFO
2313 "md/raid:%s: read error corrected"
2314 " (%lu sectors at %llu on %s)\n",
2315 mdname(conf->mddev), STRIPE_SECTORS,
2316 (unsigned long long)s,
2317 bdevname(rdev->bdev, b));
2318 atomic_add(STRIPE_SECTORS, &rdev->corrected_errors);
2319 clear_bit(R5_ReadError, &sh->dev[i].flags);
2320 clear_bit(R5_ReWrite, &sh->dev[i].flags);
2321 } else if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags))
2322 clear_bit(R5_ReadNoMerge, &sh->dev[i].flags);
2323
2324 if (atomic_read(&rdev->read_errors))
2325 atomic_set(&rdev->read_errors, 0);
2326 } else {
2327 const char *bdn = bdevname(rdev->bdev, b);
2328 int retry = 0;
2329 int set_bad = 0;
2330
2331 clear_bit(R5_UPTODATE, &sh->dev[i].flags);
2332 atomic_inc(&rdev->read_errors);
2333 if (test_bit(R5_ReadRepl, &sh->dev[i].flags))
2334 printk_ratelimited(
2335 KERN_WARNING
2336 "md/raid:%s: read error on replacement device "
2337 "(sector %llu on %s).\n",
2338 mdname(conf->mddev),
2339 (unsigned long long)s,
2340 bdn);
2341 else if (conf->mddev->degraded >= conf->max_degraded) {
2342 set_bad = 1;
2343 printk_ratelimited(
2344 KERN_WARNING
2345 "md/raid:%s: read error not correctable "
2346 "(sector %llu on %s).\n",
2347 mdname(conf->mddev),
2348 (unsigned long long)s,
2349 bdn);
2350 } else if (test_bit(R5_ReWrite, &sh->dev[i].flags)) {
2351
2352 set_bad = 1;
2353 printk_ratelimited(
2354 KERN_WARNING
2355 "md/raid:%s: read error NOT corrected!! "
2356 "(sector %llu on %s).\n",
2357 mdname(conf->mddev),
2358 (unsigned long long)s,
2359 bdn);
2360 } else if (atomic_read(&rdev->read_errors)
2361 > conf->max_nr_stripes)
2362 printk(KERN_WARNING
2363 "md/raid:%s: Too many read errors, failing device %s.\n",
2364 mdname(conf->mddev), bdn);
2365 else
2366 retry = 1;
2367 if (set_bad && test_bit(In_sync, &rdev->flags)
2368 && !test_bit(R5_ReadNoMerge, &sh->dev[i].flags))
2369 retry = 1;
2370 if (retry)
2371 if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) {
2372 set_bit(R5_ReadError, &sh->dev[i].flags);
2373 clear_bit(R5_ReadNoMerge, &sh->dev[i].flags);
2374 } else
2375 set_bit(R5_ReadNoMerge, &sh->dev[i].flags);
2376 else {
2377 clear_bit(R5_ReadError, &sh->dev[i].flags);
2378 clear_bit(R5_ReWrite, &sh->dev[i].flags);
2379 if (!(set_bad
2380 && test_bit(In_sync, &rdev->flags)
2381 && rdev_set_badblocks(
2382 rdev, sh->sector, STRIPE_SECTORS, 0)))
2383 md_error(conf->mddev, rdev);
2384 }
2385 }
2386 rdev_dec_pending(rdev, conf->mddev);
2387 clear_bit(R5_LOCKED, &sh->dev[i].flags);
2388 set_bit(STRIPE_HANDLE, &sh->state);
2389 release_stripe(sh);
2390}
2391
2392static void raid5_end_write_request(struct bio *bi, int error)
2393{
2394 struct stripe_head *sh = bi->bi_private;
2395 struct r5conf *conf = sh->raid_conf;
2396 int disks = sh->disks, i;
2397 struct md_rdev *uninitialized_var(rdev);
2398 int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags);
2399 sector_t first_bad;
2400 int bad_sectors;
2401 int replacement = 0;
2402
2403 for (i = 0 ; i < disks; i++) {
2404 if (bi == &sh->dev[i].req) {
2405 rdev = conf->disks[i].rdev;
2406 break;
2407 }
2408 if (bi == &sh->dev[i].rreq) {
2409 rdev = conf->disks[i].replacement;
2410 if (rdev)
2411 replacement = 1;
2412 else
2413
2414
2415
2416
2417 rdev = conf->disks[i].rdev;
2418 break;
2419 }
2420 }
2421 pr_debug("end_write_request %llu/%d, count %d, uptodate: %d.\n",
2422 (unsigned long long)sh->sector, i, atomic_read(&sh->count),
2423 uptodate);
2424 if (i == disks) {
2425 BUG();
2426 return;
2427 }
2428
2429 if (replacement) {
2430 if (!uptodate)
2431 md_error(conf->mddev, rdev);
2432 else if (is_badblock(rdev, sh->sector,
2433 STRIPE_SECTORS,
2434 &first_bad, &bad_sectors))
2435 set_bit(R5_MadeGoodRepl, &sh->dev[i].flags);
2436 } else {
2437 if (!uptodate) {
2438 set_bit(STRIPE_DEGRADED, &sh->state);
2439 set_bit(WriteErrorSeen, &rdev->flags);
2440 set_bit(R5_WriteError, &sh->dev[i].flags);
2441 if (!test_and_set_bit(WantReplacement, &rdev->flags))
2442 set_bit(MD_RECOVERY_NEEDED,
2443 &rdev->mddev->recovery);
2444 } else if (is_badblock(rdev, sh->sector,
2445 STRIPE_SECTORS,
2446 &first_bad, &bad_sectors)) {
2447 set_bit(R5_MadeGood, &sh->dev[i].flags);
2448 if (test_bit(R5_ReadError, &sh->dev[i].flags))
2449
2450
2451
2452
2453 set_bit(R5_ReWrite, &sh->dev[i].flags);
2454 }
2455 }
2456 rdev_dec_pending(rdev, conf->mddev);
2457
2458 if (sh->batch_head && !uptodate && !replacement)
2459 set_bit(STRIPE_BATCH_ERR, &sh->batch_head->state);
2460
2461 if (!test_and_clear_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags))
2462 clear_bit(R5_LOCKED, &sh->dev[i].flags);
2463 set_bit(STRIPE_HANDLE, &sh->state);
2464 release_stripe(sh);
2465
2466 if (sh->batch_head && sh != sh->batch_head)
2467 release_stripe(sh->batch_head);
2468}
2469
2470static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous);
2471
2472static void raid5_build_block(struct stripe_head *sh, int i, int previous)
2473{
2474 struct r5dev *dev = &sh->dev[i];
2475
2476 bio_init(&dev->req);
2477 dev->req.bi_io_vec = &dev->vec;
2478 dev->req.bi_max_vecs = 1;
2479 dev->req.bi_private = sh;
2480
2481 bio_init(&dev->rreq);
2482 dev->rreq.bi_io_vec = &dev->rvec;
2483 dev->rreq.bi_max_vecs = 1;
2484 dev->rreq.bi_private = sh;
2485
2486 dev->flags = 0;
2487 dev->sector = compute_blocknr(sh, i, previous);
2488}
2489
2490static void error(struct mddev *mddev, struct md_rdev *rdev)
2491{
2492 char b[BDEVNAME_SIZE];
2493 struct r5conf *conf = mddev->private;
2494 unsigned long flags;
2495 pr_debug("raid456: error called\n");
2496
2497 spin_lock_irqsave(&conf->device_lock, flags);
2498 clear_bit(In_sync, &rdev->flags);
2499 mddev->degraded = calc_degraded(conf);
2500 spin_unlock_irqrestore(&conf->device_lock, flags);
2501 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2502
2503 set_bit(Blocked, &rdev->flags);
2504 set_bit(Faulty, &rdev->flags);
2505 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2506 printk(KERN_ALERT
2507 "md/raid:%s: Disk failure on %s, disabling device.\n"
2508 "md/raid:%s: Operation continuing on %d devices.\n",
2509 mdname(mddev),
2510 bdevname(rdev->bdev, b),
2511 mdname(mddev),
2512 conf->raid_disks - mddev->degraded);
2513}
2514
2515
2516
2517
2518
2519static sector_t raid5_compute_sector(struct r5conf *conf, sector_t r_sector,
2520 int previous, int *dd_idx,
2521 struct stripe_head *sh)
2522{
2523 sector_t stripe, stripe2;
2524 sector_t chunk_number;
2525 unsigned int chunk_offset;
2526 int pd_idx, qd_idx;
2527 int ddf_layout = 0;
2528 sector_t new_sector;
2529 int algorithm = previous ? conf->prev_algo
2530 : conf->algorithm;
2531 int sectors_per_chunk = previous ? conf->prev_chunk_sectors
2532 : conf->chunk_sectors;
2533 int raid_disks = previous ? conf->previous_raid_disks
2534 : conf->raid_disks;
2535 int data_disks = raid_disks - conf->max_degraded;
2536
2537
2538
2539
2540
2541
2542 chunk_offset = sector_div(r_sector, sectors_per_chunk);
2543 chunk_number = r_sector;
2544
2545
2546
2547
2548 stripe = chunk_number;
2549 *dd_idx = sector_div(stripe, data_disks);
2550 stripe2 = stripe;
2551
2552
2553
2554 pd_idx = qd_idx = -1;
2555 switch(conf->level) {
2556 case 4:
2557 pd_idx = data_disks;
2558 break;
2559 case 5:
2560 switch (algorithm) {
2561 case ALGORITHM_LEFT_ASYMMETRIC:
2562 pd_idx = data_disks - sector_div(stripe2, raid_disks);
2563 if (*dd_idx >= pd_idx)
2564 (*dd_idx)++;
2565 break;
2566 case ALGORITHM_RIGHT_ASYMMETRIC:
2567 pd_idx = sector_div(stripe2, raid_disks);
2568 if (*dd_idx >= pd_idx)
2569 (*dd_idx)++;
2570 break;
2571 case ALGORITHM_LEFT_SYMMETRIC:
2572 pd_idx = data_disks - sector_div(stripe2, raid_disks);
2573 *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks;
2574 break;
2575 case ALGORITHM_RIGHT_SYMMETRIC:
2576 pd_idx = sector_div(stripe2, raid_disks);
2577 *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks;
2578 break;
2579 case ALGORITHM_PARITY_0:
2580 pd_idx = 0;
2581 (*dd_idx)++;
2582 break;
2583 case ALGORITHM_PARITY_N:
2584 pd_idx = data_disks;
2585 break;
2586 default:
2587 BUG();
2588 }
2589 break;
2590 case 6:
2591
2592 switch (algorithm) {
2593 case ALGORITHM_LEFT_ASYMMETRIC:
2594 pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks);
2595 qd_idx = pd_idx + 1;
2596 if (pd_idx == raid_disks-1) {
2597 (*dd_idx)++;
2598 qd_idx = 0;
2599 } else if (*dd_idx >= pd_idx)
2600 (*dd_idx) += 2;
2601 break;
2602 case ALGORITHM_RIGHT_ASYMMETRIC:
2603 pd_idx = sector_div(stripe2, raid_disks);
2604 qd_idx = pd_idx + 1;
2605 if (pd_idx == raid_disks-1) {
2606 (*dd_idx)++;
2607 qd_idx = 0;
2608 } else if (*dd_idx >= pd_idx)
2609 (*dd_idx) += 2;
2610 break;
2611 case ALGORITHM_LEFT_SYMMETRIC:
2612 pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks);
2613 qd_idx = (pd_idx + 1) % raid_disks;
2614 *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks;
2615 break;
2616 case ALGORITHM_RIGHT_SYMMETRIC:
2617 pd_idx = sector_div(stripe2, raid_disks);
2618 qd_idx = (pd_idx + 1) % raid_disks;
2619 *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks;
2620 break;
2621
2622 case ALGORITHM_PARITY_0:
2623 pd_idx = 0;
2624 qd_idx = 1;
2625 (*dd_idx) += 2;
2626 break;
2627 case ALGORITHM_PARITY_N:
2628 pd_idx = data_disks;
2629 qd_idx = data_disks + 1;
2630 break;
2631
2632 case ALGORITHM_ROTATING_ZERO_RESTART:
2633
2634
2635
2636 pd_idx = sector_div(stripe2, raid_disks);
2637 qd_idx = pd_idx + 1;
2638 if (pd_idx == raid_disks-1) {
2639 (*dd_idx)++;
2640 qd_idx = 0;
2641 } else if (*dd_idx >= pd_idx)
2642 (*dd_idx) += 2;
2643 ddf_layout = 1;
2644 break;
2645
2646 case ALGORITHM_ROTATING_N_RESTART:
2647
2648
2649
2650
2651 stripe2 += 1;
2652 pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks);
2653 qd_idx = pd_idx + 1;
2654 if (pd_idx == raid_disks-1) {
2655 (*dd_idx)++;
2656 qd_idx = 0;
2657 } else if (*dd_idx >= pd_idx)
2658 (*dd_idx) += 2;
2659 ddf_layout = 1;
2660 break;
2661
2662 case ALGORITHM_ROTATING_N_CONTINUE:
2663
2664 pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks);
2665 qd_idx = (pd_idx + raid_disks - 1) % raid_disks;
2666 *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks;
2667 ddf_layout = 1;
2668 break;
2669
2670 case ALGORITHM_LEFT_ASYMMETRIC_6:
2671
2672 pd_idx = data_disks - sector_div(stripe2, raid_disks-1);
2673 if (*dd_idx >= pd_idx)
2674 (*dd_idx)++;
2675 qd_idx = raid_disks - 1;
2676 break;
2677
2678 case ALGORITHM_RIGHT_ASYMMETRIC_6:
2679 pd_idx = sector_div(stripe2, raid_disks-1);
2680 if (*dd_idx >= pd_idx)
2681 (*dd_idx)++;
2682 qd_idx = raid_disks - 1;
2683 break;
2684
2685 case ALGORITHM_LEFT_SYMMETRIC_6:
2686 pd_idx = data_disks - sector_div(stripe2, raid_disks-1);
2687 *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1);
2688 qd_idx = raid_disks - 1;
2689 break;
2690
2691 case ALGORITHM_RIGHT_SYMMETRIC_6:
2692 pd_idx = sector_div(stripe2, raid_disks-1);
2693 *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1);
2694 qd_idx = raid_disks - 1;
2695 break;
2696
2697 case ALGORITHM_PARITY_0_6:
2698 pd_idx = 0;
2699 (*dd_idx)++;
2700 qd_idx = raid_disks - 1;
2701 break;
2702
2703 default:
2704 BUG();
2705 }
2706 break;
2707 }
2708
2709 if (sh) {
2710 sh->pd_idx = pd_idx;
2711 sh->qd_idx = qd_idx;
2712 sh->ddf_layout = ddf_layout;
2713 }
2714
2715
2716
2717 new_sector = (sector_t)stripe * sectors_per_chunk + chunk_offset;
2718 return new_sector;
2719}
2720
2721static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous)
2722{
2723 struct r5conf *conf = sh->raid_conf;
2724 int raid_disks = sh->disks;
2725 int data_disks = raid_disks - conf->max_degraded;
2726 sector_t new_sector = sh->sector, check;
2727 int sectors_per_chunk = previous ? conf->prev_chunk_sectors
2728 : conf->chunk_sectors;
2729 int algorithm = previous ? conf->prev_algo
2730 : conf->algorithm;
2731 sector_t stripe;
2732 int chunk_offset;
2733 sector_t chunk_number;
2734 int dummy1, dd_idx = i;
2735 sector_t r_sector;
2736 struct stripe_head sh2;
2737
2738 chunk_offset = sector_div(new_sector, sectors_per_chunk);
2739 stripe = new_sector;
2740
2741 if (i == sh->pd_idx)
2742 return 0;
2743 switch(conf->level) {
2744 case 4: break;
2745 case 5:
2746 switch (algorithm) {
2747 case ALGORITHM_LEFT_ASYMMETRIC:
2748 case ALGORITHM_RIGHT_ASYMMETRIC:
2749 if (i > sh->pd_idx)
2750 i--;
2751 break;
2752 case ALGORITHM_LEFT_SYMMETRIC:
2753 case ALGORITHM_RIGHT_SYMMETRIC:
2754 if (i < sh->pd_idx)
2755 i += raid_disks;
2756 i -= (sh->pd_idx + 1);
2757 break;
2758 case ALGORITHM_PARITY_0:
2759 i -= 1;
2760 break;
2761 case ALGORITHM_PARITY_N:
2762 break;
2763 default:
2764 BUG();
2765 }
2766 break;
2767 case 6:
2768 if (i == sh->qd_idx)
2769 return 0;
2770 switch (algorithm) {
2771 case ALGORITHM_LEFT_ASYMMETRIC:
2772 case ALGORITHM_RIGHT_ASYMMETRIC:
2773 case ALGORITHM_ROTATING_ZERO_RESTART:
2774 case ALGORITHM_ROTATING_N_RESTART:
2775 if (sh->pd_idx == raid_disks-1)
2776 i--;
2777 else if (i > sh->pd_idx)
2778 i -= 2;
2779 break;
2780 case ALGORITHM_LEFT_SYMMETRIC:
2781 case ALGORITHM_RIGHT_SYMMETRIC:
2782 if (sh->pd_idx == raid_disks-1)
2783 i--;
2784 else {
2785
2786 if (i < sh->pd_idx)
2787 i += raid_disks;
2788 i -= (sh->pd_idx + 2);
2789 }
2790 break;
2791 case ALGORITHM_PARITY_0:
2792 i -= 2;
2793 break;
2794 case ALGORITHM_PARITY_N:
2795 break;
2796 case ALGORITHM_ROTATING_N_CONTINUE:
2797
2798 if (sh->pd_idx == 0)
2799 i--;
2800 else {
2801
2802 if (i < sh->pd_idx)
2803 i += raid_disks;
2804 i -= (sh->pd_idx + 1);
2805 }
2806 break;
2807 case ALGORITHM_LEFT_ASYMMETRIC_6:
2808 case ALGORITHM_RIGHT_ASYMMETRIC_6:
2809 if (i > sh->pd_idx)
2810 i--;
2811 break;
2812 case ALGORITHM_LEFT_SYMMETRIC_6:
2813 case ALGORITHM_RIGHT_SYMMETRIC_6:
2814 if (i < sh->pd_idx)
2815 i += data_disks + 1;
2816 i -= (sh->pd_idx + 1);
2817 break;
2818 case ALGORITHM_PARITY_0_6:
2819 i -= 1;
2820 break;
2821 default:
2822 BUG();
2823 }
2824 break;
2825 }
2826
2827 chunk_number = stripe * data_disks + i;
2828 r_sector = chunk_number * sectors_per_chunk + chunk_offset;
2829
2830 check = raid5_compute_sector(conf, r_sector,
2831 previous, &dummy1, &sh2);
2832 if (check != sh->sector || dummy1 != dd_idx || sh2.pd_idx != sh->pd_idx
2833 || sh2.qd_idx != sh->qd_idx) {
2834 printk(KERN_ERR "md/raid:%s: compute_blocknr: map not correct\n",
2835 mdname(conf->mddev));
2836 return 0;
2837 }
2838 return r_sector;
2839}
2840
2841static void
2842schedule_reconstruction(struct stripe_head *sh, struct stripe_head_state *s,
2843 int rcw, int expand)
2844{
2845 int i, pd_idx = sh->pd_idx, qd_idx = sh->qd_idx, disks = sh->disks;
2846 struct r5conf *conf = sh->raid_conf;
2847 int level = conf->level;
2848
2849 if (rcw) {
2850
2851 for (i = disks; i--; ) {
2852 struct r5dev *dev = &sh->dev[i];
2853
2854 if (dev->towrite) {
2855 set_bit(R5_LOCKED, &dev->flags);
2856 set_bit(R5_Wantdrain, &dev->flags);
2857 if (!expand)
2858 clear_bit(R5_UPTODATE, &dev->flags);
2859 s->locked++;
2860 }
2861 }
2862
2863
2864
2865
2866 if (!expand) {
2867 if (!s->locked)
2868
2869 return;
2870 sh->reconstruct_state = reconstruct_state_drain_run;
2871 set_bit(STRIPE_OP_BIODRAIN, &s->ops_request);
2872 } else
2873 sh->reconstruct_state = reconstruct_state_run;
2874
2875 set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request);
2876
2877 if (s->locked + conf->max_degraded == disks)
2878 if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state))
2879 atomic_inc(&conf->pending_full_writes);
2880 } else {
2881 BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) ||
2882 test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags)));
2883 BUG_ON(level == 6 &&
2884 (!(test_bit(R5_UPTODATE, &sh->dev[qd_idx].flags) ||
2885 test_bit(R5_Wantcompute, &sh->dev[qd_idx].flags))));
2886
2887 for (i = disks; i--; ) {
2888 struct r5dev *dev = &sh->dev[i];
2889 if (i == pd_idx || i == qd_idx)
2890 continue;
2891
2892 if (dev->towrite &&
2893 (test_bit(R5_UPTODATE, &dev->flags) ||
2894 test_bit(R5_Wantcompute, &dev->flags))) {
2895 set_bit(R5_Wantdrain, &dev->flags);
2896 set_bit(R5_LOCKED, &dev->flags);
2897 clear_bit(R5_UPTODATE, &dev->flags);
2898 s->locked++;
2899 }
2900 }
2901 if (!s->locked)
2902
2903 return;
2904 sh->reconstruct_state = reconstruct_state_prexor_drain_run;
2905 set_bit(STRIPE_OP_PREXOR, &s->ops_request);
2906 set_bit(STRIPE_OP_BIODRAIN, &s->ops_request);
2907 set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request);
2908 }
2909
2910
2911
2912
2913 set_bit(R5_LOCKED, &sh->dev[pd_idx].flags);
2914 clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags);
2915 s->locked++;
2916
2917 if (level == 6) {
2918 int qd_idx = sh->qd_idx;
2919 struct r5dev *dev = &sh->dev[qd_idx];
2920
2921 set_bit(R5_LOCKED, &dev->flags);
2922 clear_bit(R5_UPTODATE, &dev->flags);
2923 s->locked++;
2924 }
2925
2926 pr_debug("%s: stripe %llu locked: %d ops_request: %lx\n",
2927 __func__, (unsigned long long)sh->sector,
2928 s->locked, s->ops_request);
2929}
2930
2931
2932
2933
2934
2935
2936static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx,
2937 int forwrite, int previous)
2938{
2939 struct bio **bip;
2940 struct r5conf *conf = sh->raid_conf;
2941 int firstwrite=0;
2942
2943 pr_debug("adding bi b#%llu to stripe s#%llu\n",
2944 (unsigned long long)bi->bi_iter.bi_sector,
2945 (unsigned long long)sh->sector);
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955 spin_lock_irq(&sh->stripe_lock);
2956
2957 if (sh->batch_head)
2958 goto overlap;
2959 if (forwrite) {
2960 bip = &sh->dev[dd_idx].towrite;
2961 if (*bip == NULL)
2962 firstwrite = 1;
2963 } else
2964 bip = &sh->dev[dd_idx].toread;
2965 while (*bip && (*bip)->bi_iter.bi_sector < bi->bi_iter.bi_sector) {
2966 if (bio_end_sector(*bip) > bi->bi_iter.bi_sector)
2967 goto overlap;
2968 bip = & (*bip)->bi_next;
2969 }
2970 if (*bip && (*bip)->bi_iter.bi_sector < bio_end_sector(bi))
2971 goto overlap;
2972
2973 if (!forwrite || previous)
2974 clear_bit(STRIPE_BATCH_READY, &sh->state);
2975
2976 BUG_ON(*bip && bi->bi_next && (*bip) != bi->bi_next);
2977 if (*bip)
2978 bi->bi_next = *bip;
2979 *bip = bi;
2980 raid5_inc_bi_active_stripes(bi);
2981
2982 if (forwrite) {
2983
2984 sector_t sector = sh->dev[dd_idx].sector;
2985 for (bi=sh->dev[dd_idx].towrite;
2986 sector < sh->dev[dd_idx].sector + STRIPE_SECTORS &&
2987 bi && bi->bi_iter.bi_sector <= sector;
2988 bi = r5_next_bio(bi, sh->dev[dd_idx].sector)) {
2989 if (bio_end_sector(bi) >= sector)
2990 sector = bio_end_sector(bi);
2991 }
2992 if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS)
2993 if (!test_and_set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags))
2994 sh->overwrite_disks++;
2995 }
2996
2997 pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n",
2998 (unsigned long long)(*bip)->bi_iter.bi_sector,
2999 (unsigned long long)sh->sector, dd_idx);
3000
3001 if (conf->mddev->bitmap && firstwrite) {
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014 set_bit(STRIPE_BITMAP_PENDING, &sh->state);
3015 spin_unlock_irq(&sh->stripe_lock);
3016 bitmap_startwrite(conf->mddev->bitmap, sh->sector,
3017 STRIPE_SECTORS, 0);
3018 spin_lock_irq(&sh->stripe_lock);
3019 clear_bit(STRIPE_BITMAP_PENDING, &sh->state);
3020 if (!sh->batch_head) {
3021 sh->bm_seq = conf->seq_flush+1;
3022 set_bit(STRIPE_BIT_DELAY, &sh->state);
3023 }
3024 }
3025 spin_unlock_irq(&sh->stripe_lock);
3026
3027 if (stripe_can_batch(sh))
3028 stripe_add_to_batch_list(conf, sh);
3029 return 1;
3030
3031 overlap:
3032 set_bit(R5_Overlap, &sh->dev[dd_idx].flags);
3033 spin_unlock_irq(&sh->stripe_lock);
3034 return 0;
3035}
3036
3037static void end_reshape(struct r5conf *conf);
3038
3039static void stripe_set_idx(sector_t stripe, struct r5conf *conf, int previous,
3040 struct stripe_head *sh)
3041{
3042 int sectors_per_chunk =
3043 previous ? conf->prev_chunk_sectors : conf->chunk_sectors;
3044 int dd_idx;
3045 int chunk_offset = sector_div(stripe, sectors_per_chunk);
3046 int disks = previous ? conf->previous_raid_disks : conf->raid_disks;
3047
3048 raid5_compute_sector(conf,
3049 stripe * (disks - conf->max_degraded)
3050 *sectors_per_chunk + chunk_offset,
3051 previous,
3052 &dd_idx, sh);
3053}
3054
3055static void
3056handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh,
3057 struct stripe_head_state *s, int disks,
3058 struct bio **return_bi)
3059{
3060 int i;
3061 BUG_ON(sh->batch_head);
3062 for (i = disks; i--; ) {
3063 struct bio *bi;
3064 int bitmap_end = 0;
3065
3066 if (test_bit(R5_ReadError, &sh->dev[i].flags)) {
3067 struct md_rdev *rdev;
3068 rcu_read_lock();
3069 rdev = rcu_dereference(conf->disks[i].rdev);
3070 if (rdev && test_bit(In_sync, &rdev->flags))
3071 atomic_inc(&rdev->nr_pending);
3072 else
3073 rdev = NULL;
3074 rcu_read_unlock();
3075 if (rdev) {
3076 if (!rdev_set_badblocks(
3077 rdev,
3078 sh->sector,
3079 STRIPE_SECTORS, 0))
3080 md_error(conf->mddev, rdev);
3081 rdev_dec_pending(rdev, conf->mddev);
3082 }
3083 }
3084 spin_lock_irq(&sh->stripe_lock);
3085
3086 bi = sh->dev[i].towrite;
3087 sh->dev[i].towrite = NULL;
3088 sh->overwrite_disks = 0;
3089 spin_unlock_irq(&sh->stripe_lock);
3090 if (bi)
3091 bitmap_end = 1;
3092
3093 if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags))
3094 wake_up(&conf->wait_for_overlap);
3095
3096 while (bi && bi->bi_iter.bi_sector <
3097 sh->dev[i].sector + STRIPE_SECTORS) {
3098 struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector);
3099 clear_bit(BIO_UPTODATE, &bi->bi_flags);
3100 if (!raid5_dec_bi_active_stripes(bi)) {
3101 md_write_end(conf->mddev);
3102 bi->bi_next = *return_bi;
3103 *return_bi = bi;
3104 }
3105 bi = nextbi;
3106 }
3107 if (bitmap_end)
3108 bitmap_endwrite(conf->mddev->bitmap, sh->sector,
3109 STRIPE_SECTORS, 0, 0);
3110 bitmap_end = 0;
3111
3112 bi = sh->dev[i].written;
3113 sh->dev[i].written = NULL;
3114 if (test_and_clear_bit(R5_SkipCopy, &sh->dev[i].flags)) {
3115 WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags));
3116 sh->dev[i].page = sh->dev[i].orig_page;
3117 }
3118
3119 if (bi) bitmap_end = 1;
3120 while (bi && bi->bi_iter.bi_sector <
3121 sh->dev[i].sector + STRIPE_SECTORS) {
3122 struct bio *bi2 = r5_next_bio(bi, sh->dev[i].sector);
3123 clear_bit(BIO_UPTODATE, &bi->bi_flags);
3124 if (!raid5_dec_bi_active_stripes(bi)) {
3125 md_write_end(conf->mddev);
3126 bi->bi_next = *return_bi;
3127 *return_bi = bi;
3128 }
3129 bi = bi2;
3130 }
3131
3132
3133
3134
3135 if (!test_bit(R5_Wantfill, &sh->dev[i].flags) &&
3136 (!test_bit(R5_Insync, &sh->dev[i].flags) ||
3137 test_bit(R5_ReadError, &sh->dev[i].flags))) {
3138 spin_lock_irq(&sh->stripe_lock);
3139 bi = sh->dev[i].toread;
3140 sh->dev[i].toread = NULL;
3141 spin_unlock_irq(&sh->stripe_lock);
3142 if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags))
3143 wake_up(&conf->wait_for_overlap);
3144 while (bi && bi->bi_iter.bi_sector <
3145 sh->dev[i].sector + STRIPE_SECTORS) {
3146 struct bio *nextbi =
3147 r5_next_bio(bi, sh->dev[i].sector);
3148 clear_bit(BIO_UPTODATE, &bi->bi_flags);
3149 if (!raid5_dec_bi_active_stripes(bi)) {
3150 bi->bi_next = *return_bi;
3151 *return_bi = bi;
3152 }
3153 bi = nextbi;
3154 }
3155 }
3156 if (bitmap_end)
3157 bitmap_endwrite(conf->mddev->bitmap, sh->sector,
3158 STRIPE_SECTORS, 0, 0);
3159
3160
3161
3162 clear_bit(R5_LOCKED, &sh->dev[i].flags);
3163 }
3164
3165 if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state))
3166 if (atomic_dec_and_test(&conf->pending_full_writes))
3167 md_wakeup_thread(conf->mddev->thread);
3168}
3169
3170static void
3171handle_failed_sync(struct r5conf *conf, struct stripe_head *sh,
3172 struct stripe_head_state *s)
3173{
3174 int abort = 0;
3175 int i;
3176
3177 BUG_ON(sh->batch_head);
3178 clear_bit(STRIPE_SYNCING, &sh->state);
3179 if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags))
3180 wake_up(&conf->wait_for_overlap);
3181 s->syncing = 0;
3182 s->replacing = 0;
3183
3184
3185
3186
3187
3188
3189
3190 if (test_bit(MD_RECOVERY_RECOVER, &conf->mddev->recovery)) {
3191
3192
3193
3194 for (i = 0; i < conf->raid_disks; i++) {
3195 struct md_rdev *rdev = conf->disks[i].rdev;
3196 if (rdev
3197 && !test_bit(Faulty, &rdev->flags)
3198 && !test_bit(In_sync, &rdev->flags)
3199 && !rdev_set_badblocks(rdev, sh->sector,
3200 STRIPE_SECTORS, 0))
3201 abort = 1;
3202 rdev = conf->disks[i].replacement;
3203 if (rdev
3204 && !test_bit(Faulty, &rdev->flags)
3205 && !test_bit(In_sync, &rdev->flags)
3206 && !rdev_set_badblocks(rdev, sh->sector,
3207 STRIPE_SECTORS, 0))
3208 abort = 1;
3209 }
3210 if (abort)
3211 conf->recovery_disabled =
3212 conf->mddev->recovery_disabled;
3213 }
3214 md_done_sync(conf->mddev, STRIPE_SECTORS, !abort);
3215}
3216
3217static int want_replace(struct stripe_head *sh, int disk_idx)
3218{
3219 struct md_rdev *rdev;
3220 int rv = 0;
3221
3222 rdev = sh->raid_conf->disks[disk_idx].replacement;
3223 if (rdev
3224 && !test_bit(Faulty, &rdev->flags)
3225 && !test_bit(In_sync, &rdev->flags)
3226 && (rdev->recovery_offset <= sh->sector
3227 || rdev->mddev->recovery_cp <= sh->sector))
3228 rv = 1;
3229
3230 return rv;
3231}
3232
3233
3234
3235
3236
3237
3238
3239
3240static int need_this_block(struct stripe_head *sh, struct stripe_head_state *s,
3241 int disk_idx, int disks)
3242{
3243 struct r5dev *dev = &sh->dev[disk_idx];
3244 struct r5dev *fdev[2] = { &sh->dev[s->failed_num[0]],
3245 &sh->dev[s->failed_num[1]] };
3246 int i;
3247
3248
3249 if (test_bit(R5_LOCKED, &dev->flags) ||
3250 test_bit(R5_UPTODATE, &dev->flags))
3251
3252
3253
3254 return 0;
3255
3256 if (dev->toread ||
3257 (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags)))
3258
3259 return 1;
3260
3261 if (s->syncing || s->expanding ||
3262 (s->replacing && want_replace(sh, disk_idx)))
3263
3264
3265
3266 return 1;
3267
3268 if ((s->failed >= 1 && fdev[0]->toread) ||
3269 (s->failed >= 2 && fdev[1]->toread))
3270
3271
3272
3273 return 1;
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283 if (!s->failed || !s->to_write)
3284 return 0;
3285
3286 if (test_bit(R5_Insync, &dev->flags) &&
3287 !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
3288
3289
3290
3291
3292
3293 return 0;
3294
3295 for (i = 0; i < s->failed; i++) {
3296 if (fdev[i]->towrite &&
3297 !test_bit(R5_UPTODATE, &fdev[i]->flags) &&
3298 !test_bit(R5_OVERWRITE, &fdev[i]->flags))
3299
3300
3301
3302
3303
3304 return 1;
3305 }
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315 if (sh->raid_conf->level != 6 &&
3316 sh->sector < sh->raid_conf->mddev->recovery_cp)
3317
3318 return 0;
3319 for (i = 0; i < s->failed; i++) {
3320 if (s->failed_num[i] != sh->pd_idx &&
3321 s->failed_num[i] != sh->qd_idx &&
3322 !test_bit(R5_UPTODATE, &fdev[i]->flags) &&
3323 !test_bit(R5_OVERWRITE, &fdev[i]->flags))
3324 return 1;
3325 }
3326
3327 return 0;
3328}
3329
3330static int fetch_block(struct stripe_head *sh, struct stripe_head_state *s,
3331 int disk_idx, int disks)
3332{
3333 struct r5dev *dev = &sh->dev[disk_idx];
3334
3335
3336 if (need_this_block(sh, s, disk_idx, disks)) {
3337
3338
3339
3340 BUG_ON(test_bit(R5_Wantcompute, &dev->flags));
3341 BUG_ON(test_bit(R5_Wantread, &dev->flags));
3342 BUG_ON(sh->batch_head);
3343 if ((s->uptodate == disks - 1) &&
3344 (s->failed && (disk_idx == s->failed_num[0] ||
3345 disk_idx == s->failed_num[1]))) {
3346
3347
3348
3349 pr_debug("Computing stripe %llu block %d\n",
3350 (unsigned long long)sh->sector, disk_idx);
3351 set_bit(STRIPE_COMPUTE_RUN, &sh->state);
3352 set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request);
3353 set_bit(R5_Wantcompute, &dev->flags);
3354 sh->ops.target = disk_idx;
3355 sh->ops.target2 = -1;
3356 s->req_compute = 1;
3357
3358
3359
3360
3361
3362
3363 s->uptodate++;
3364 return 1;
3365 } else if (s->uptodate == disks-2 && s->failed >= 2) {
3366
3367
3368
3369 int other;
3370 for (other = disks; other--; ) {
3371 if (other == disk_idx)
3372 continue;
3373 if (!test_bit(R5_UPTODATE,
3374 &sh->dev[other].flags))
3375 break;
3376 }
3377 BUG_ON(other < 0);
3378 pr_debug("Computing stripe %llu blocks %d,%d\n",
3379 (unsigned long long)sh->sector,
3380 disk_idx, other);
3381 set_bit(STRIPE_COMPUTE_RUN, &sh->state);
3382 set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request);
3383 set_bit(R5_Wantcompute, &sh->dev[disk_idx].flags);
3384 set_bit(R5_Wantcompute, &sh->dev[other].flags);
3385 sh->ops.target = disk_idx;
3386 sh->ops.target2 = other;
3387 s->uptodate += 2;
3388 s->req_compute = 1;
3389 return 1;
3390 } else if (test_bit(R5_Insync, &dev->flags)) {
3391 set_bit(R5_LOCKED, &dev->flags);
3392 set_bit(R5_Wantread, &dev->flags);
3393 s->locked++;
3394 pr_debug("Reading block %d (sync=%d)\n",
3395 disk_idx, s->syncing);
3396 }
3397 }
3398
3399 return 0;
3400}
3401
3402
3403
3404
3405static void handle_stripe_fill(struct stripe_head *sh,
3406 struct stripe_head_state *s,
3407 int disks)
3408{
3409 int i;
3410
3411
3412
3413
3414
3415 if (!test_bit(STRIPE_COMPUTE_RUN, &sh->state) && !sh->check_state &&
3416 !sh->reconstruct_state)
3417 for (i = disks; i--; )
3418 if (fetch_block(sh, s, i, disks))
3419 break;
3420 set_bit(STRIPE_HANDLE, &sh->state);
3421}
3422
3423static void break_stripe_batch_list(struct stripe_head *head_sh,
3424 unsigned long handle_flags);
3425
3426
3427
3428
3429
3430static void handle_stripe_clean_event(struct r5conf *conf,
3431 struct stripe_head *sh, int disks, struct bio **return_bi)
3432{
3433 int i;
3434 struct r5dev *dev;
3435 int discard_pending = 0;
3436 struct stripe_head *head_sh = sh;
3437 bool do_endio = false;
3438
3439 for (i = disks; i--; )
3440 if (sh->dev[i].written) {
3441 dev = &sh->dev[i];
3442 if (!test_bit(R5_LOCKED, &dev->flags) &&
3443 (test_bit(R5_UPTODATE, &dev->flags) ||
3444 test_bit(R5_Discard, &dev->flags) ||
3445 test_bit(R5_SkipCopy, &dev->flags))) {
3446
3447 struct bio *wbi, *wbi2;
3448 pr_debug("Return write for disc %d\n", i);
3449 if (test_and_clear_bit(R5_Discard, &dev->flags))
3450 clear_bit(R5_UPTODATE, &dev->flags);
3451 if (test_and_clear_bit(R5_SkipCopy, &dev->flags)) {
3452 WARN_ON(test_bit(R5_UPTODATE, &dev->flags));
3453 }
3454 do_endio = true;
3455
3456returnbi:
3457 dev->page = dev->orig_page;
3458 wbi = dev->written;
3459 dev->written = NULL;
3460 while (wbi && wbi->bi_iter.bi_sector <
3461 dev->sector + STRIPE_SECTORS) {
3462 wbi2 = r5_next_bio(wbi, dev->sector);
3463 if (!raid5_dec_bi_active_stripes(wbi)) {
3464 md_write_end(conf->mddev);
3465 wbi->bi_next = *return_bi;
3466 *return_bi = wbi;
3467 }
3468 wbi = wbi2;
3469 }
3470 bitmap_endwrite(conf->mddev->bitmap, sh->sector,
3471 STRIPE_SECTORS,
3472 !test_bit(STRIPE_DEGRADED, &sh->state),
3473 0);
3474 if (head_sh->batch_head) {
3475 sh = list_first_entry(&sh->batch_list,
3476 struct stripe_head,
3477 batch_list);
3478 if (sh != head_sh) {
3479 dev = &sh->dev[i];
3480 goto returnbi;
3481 }
3482 }
3483 sh = head_sh;
3484 dev = &sh->dev[i];
3485 } else if (test_bit(R5_Discard, &dev->flags))
3486 discard_pending = 1;
3487 WARN_ON(test_bit(R5_SkipCopy, &dev->flags));
3488 WARN_ON(dev->page != dev->orig_page);
3489 }
3490 if (!discard_pending &&
3491 test_bit(R5_Discard, &sh->dev[sh->pd_idx].flags)) {
3492 clear_bit(R5_Discard, &sh->dev[sh->pd_idx].flags);
3493 clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags);
3494 if (sh->qd_idx >= 0) {
3495 clear_bit(R5_Discard, &sh->dev[sh->qd_idx].flags);
3496 clear_bit(R5_UPTODATE, &sh->dev[sh->qd_idx].flags);
3497 }
3498
3499 clear_bit(STRIPE_DISCARD, &sh->state);
3500
3501
3502
3503
3504
3505 spin_lock_irq(&conf->device_lock);
3506unhash:
3507 remove_hash(sh);
3508 if (head_sh->batch_head) {
3509 sh = list_first_entry(&sh->batch_list,
3510 struct stripe_head, batch_list);
3511 if (sh != head_sh)
3512 goto unhash;
3513 }
3514 spin_unlock_irq(&conf->device_lock);
3515 sh = head_sh;
3516
3517 if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state))
3518 set_bit(STRIPE_HANDLE, &sh->state);
3519
3520 }
3521
3522 if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state))
3523 if (atomic_dec_and_test(&conf->pending_full_writes))
3524 md_wakeup_thread(conf->mddev->thread);
3525
3526 if (head_sh->batch_head && do_endio)
3527 break_stripe_batch_list(head_sh, STRIPE_EXPAND_SYNC_FLAGS);
3528}
3529
3530static void handle_stripe_dirtying(struct r5conf *conf,
3531 struct stripe_head *sh,
3532 struct stripe_head_state *s,
3533 int disks)
3534{
3535 int rmw = 0, rcw = 0, i;
3536 sector_t recovery_cp = conf->mddev->recovery_cp;
3537
3538
3539
3540
3541
3542
3543
3544
3545 if (conf->rmw_level == PARITY_DISABLE_RMW ||
3546 (recovery_cp < MaxSector && sh->sector >= recovery_cp &&
3547 s->failed == 0)) {
3548
3549
3550
3551 rcw = 1; rmw = 2;
3552 pr_debug("force RCW rmw_level=%u, recovery_cp=%llu sh->sector=%llu\n",
3553 conf->rmw_level, (unsigned long long)recovery_cp,
3554 (unsigned long long)sh->sector);
3555 } else for (i = disks; i--; ) {
3556
3557 struct r5dev *dev = &sh->dev[i];
3558 if ((dev->towrite || i == sh->pd_idx || i == sh->qd_idx) &&
3559 !test_bit(R5_LOCKED, &dev->flags) &&
3560 !(test_bit(R5_UPTODATE, &dev->flags) ||
3561 test_bit(R5_Wantcompute, &dev->flags))) {
3562 if (test_bit(R5_Insync, &dev->flags))
3563 rmw++;
3564 else
3565 rmw += 2*disks;
3566 }
3567
3568 if (!test_bit(R5_OVERWRITE, &dev->flags) &&
3569 i != sh->pd_idx && i != sh->qd_idx &&
3570 !test_bit(R5_LOCKED, &dev->flags) &&
3571 !(test_bit(R5_UPTODATE, &dev->flags) ||
3572 test_bit(R5_Wantcompute, &dev->flags))) {
3573 if (test_bit(R5_Insync, &dev->flags))
3574 rcw++;
3575 else
3576 rcw += 2*disks;
3577 }
3578 }
3579 pr_debug("for sector %llu, rmw=%d rcw=%d\n",
3580 (unsigned long long)sh->sector, rmw, rcw);
3581 set_bit(STRIPE_HANDLE, &sh->state);
3582 if ((rmw < rcw || (rmw == rcw && conf->rmw_level == PARITY_ENABLE_RMW)) && rmw > 0) {
3583
3584 if (conf->mddev->queue)
3585 blk_add_trace_msg(conf->mddev->queue,
3586 "raid5 rmw %llu %d",
3587 (unsigned long long)sh->sector, rmw);
3588 for (i = disks; i--; ) {
3589 struct r5dev *dev = &sh->dev[i];
3590 if ((dev->towrite || i == sh->pd_idx || i == sh->qd_idx) &&
3591 !test_bit(R5_LOCKED, &dev->flags) &&
3592 !(test_bit(R5_UPTODATE, &dev->flags) ||
3593 test_bit(R5_Wantcompute, &dev->flags)) &&
3594 test_bit(R5_Insync, &dev->flags)) {
3595 if (test_bit(STRIPE_PREREAD_ACTIVE,
3596 &sh->state)) {
3597 pr_debug("Read_old block %d for r-m-w\n",
3598 i);
3599 set_bit(R5_LOCKED, &dev->flags);
3600 set_bit(R5_Wantread, &dev->flags);
3601 s->locked++;
3602 } else {
3603 set_bit(STRIPE_DELAYED, &sh->state);
3604 set_bit(STRIPE_HANDLE, &sh->state);
3605 }
3606 }
3607 }
3608 }
3609 if ((rcw < rmw || (rcw == rmw && conf->rmw_level != PARITY_ENABLE_RMW)) && rcw > 0) {
3610
3611 int qread =0;
3612 rcw = 0;
3613 for (i = disks; i--; ) {
3614 struct r5dev *dev = &sh->dev[i];
3615 if (!test_bit(R5_OVERWRITE, &dev->flags) &&
3616 i != sh->pd_idx && i != sh->qd_idx &&
3617 !test_bit(R5_LOCKED, &dev->flags) &&
3618 !(test_bit(R5_UPTODATE, &dev->flags) ||
3619 test_bit(R5_Wantcompute, &dev->flags))) {
3620 rcw++;
3621 if (test_bit(R5_Insync, &dev->flags) &&
3622 test_bit(STRIPE_PREREAD_ACTIVE,
3623 &sh->state)) {
3624 pr_debug("Read_old block "
3625 "%d for Reconstruct\n", i);
3626 set_bit(R5_LOCKED, &dev->flags);
3627 set_bit(R5_Wantread, &dev->flags);
3628 s->locked++;
3629 qread++;
3630 } else {
3631 set_bit(STRIPE_DELAYED, &sh->state);
3632 set_bit(STRIPE_HANDLE, &sh->state);
3633 }
3634 }
3635 }
3636 if (rcw && conf->mddev->queue)
3637 blk_add_trace_msg(conf->mddev->queue, "raid5 rcw %llu %d %d %d",
3638 (unsigned long long)sh->sector,
3639 rcw, qread, test_bit(STRIPE_DELAYED, &sh->state));
3640 }
3641
3642 if (rcw > disks && rmw > disks &&
3643 !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
3644 set_bit(STRIPE_DELAYED, &sh->state);
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656 if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) &&
3657 (s->locked == 0 && (rcw == 0 || rmw == 0) &&
3658 !test_bit(STRIPE_BIT_DELAY, &sh->state)))
3659 schedule_reconstruction(sh, s, rcw == 0, 0);
3660}
3661
3662static void handle_parity_checks5(struct r5conf *conf, struct stripe_head *sh,
3663 struct stripe_head_state *s, int disks)
3664{
3665 struct r5dev *dev = NULL;
3666
3667 BUG_ON(sh->batch_head);
3668 set_bit(STRIPE_HANDLE, &sh->state);
3669
3670 switch (sh->check_state) {
3671 case check_state_idle:
3672
3673 if (s->failed == 0) {
3674 BUG_ON(s->uptodate != disks);
3675 sh->check_state = check_state_run;
3676 set_bit(STRIPE_OP_CHECK, &s->ops_request);
3677 clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags);
3678 s->uptodate--;
3679 break;
3680 }
3681 dev = &sh->dev[s->failed_num[0]];
3682
3683 case check_state_compute_result:
3684 sh->check_state = check_state_idle;
3685 if (!dev)
3686 dev = &sh->dev[sh->pd_idx];
3687
3688
3689 if (test_bit(STRIPE_INSYNC, &sh->state))
3690 break;
3691
3692
3693 BUG_ON(!test_bit(R5_UPTODATE, &dev->flags));
3694 BUG_ON(s->uptodate != disks);
3695
3696 set_bit(R5_LOCKED, &dev->flags);
3697 s->locked++;
3698 set_bit(R5_Wantwrite, &dev->flags);
3699
3700 clear_bit(STRIPE_DEGRADED, &sh->state);
3701 set_bit(STRIPE_INSYNC, &sh->state);
3702 break;
3703 case check_state_run:
3704 break;
3705 case check_state_check_result:
3706 sh->check_state = check_state_idle;
3707
3708
3709
3710
3711 if (s->failed)
3712 break;
3713
3714
3715
3716
3717
3718 if ((sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) == 0)
3719
3720
3721
3722 set_bit(STRIPE_INSYNC, &sh->state);
3723 else {
3724 atomic64_add(STRIPE_SECTORS, &conf->mddev->resync_mismatches);
3725 if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery))
3726
3727 set_bit(STRIPE_INSYNC, &sh->state);
3728 else {
3729 sh->check_state = check_state_compute_run;
3730 set_bit(STRIPE_COMPUTE_RUN, &sh->state);
3731 set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request);
3732 set_bit(R5_Wantcompute,
3733 &sh->dev[sh->pd_idx].flags);
3734 sh->ops.target = sh->pd_idx;
3735 sh->ops.target2 = -1;
3736 s->uptodate++;
3737 }
3738 }
3739 break;
3740 case check_state_compute_run:
3741 break;
3742 default:
3743 printk(KERN_ERR "%s: unknown check_state: %d sector: %llu\n",
3744 __func__, sh->check_state,
3745 (unsigned long long) sh->sector);
3746 BUG();
3747 }
3748}
3749
3750static void handle_parity_checks6(struct r5conf *conf, struct stripe_head *sh,
3751 struct stripe_head_state *s,
3752 int disks)
3753{
3754 int pd_idx = sh->pd_idx;
3755 int qd_idx = sh->qd_idx;
3756 struct r5dev *dev;
3757
3758 BUG_ON(sh->batch_head);
3759 set_bit(STRIPE_HANDLE, &sh->state);
3760
3761 BUG_ON(s->failed > 2);
3762
3763
3764
3765
3766
3767
3768
3769 switch (sh->check_state) {
3770 case check_state_idle:
3771
3772 if (s->failed == s->q_failed) {
3773
3774
3775
3776
3777 sh->check_state = check_state_run;
3778 }
3779 if (!s->q_failed && s->failed < 2) {
3780
3781
3782
3783 if (sh->check_state == check_state_run)
3784 sh->check_state = check_state_run_pq;
3785 else
3786 sh->check_state = check_state_run_q;
3787 }
3788
3789
3790 sh->ops.zero_sum_result = 0;
3791
3792 if (sh->check_state == check_state_run) {
3793
3794 clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags);
3795 s->uptodate--;
3796 }
3797 if (sh->check_state >= check_state_run &&
3798 sh->check_state <= check_state_run_pq) {
3799
3800
3801
3802 set_bit(STRIPE_OP_CHECK, &s->ops_request);
3803 break;
3804 }
3805
3806
3807 BUG_ON(s->failed != 2);
3808
3809 case check_state_compute_result:
3810 sh->check_state = check_state_idle;
3811
3812
3813 if (test_bit(STRIPE_INSYNC, &sh->state))
3814 break;
3815
3816
3817
3818
3819 BUG_ON(s->uptodate < disks - 1);
3820 if (s->failed == 2) {
3821 dev = &sh->dev[s->failed_num[1]];
3822 s->locked++;
3823 set_bit(R5_LOCKED, &dev->flags);
3824 set_bit(R5_Wantwrite, &dev->flags);
3825 }
3826 if (s->failed >= 1) {
3827 dev = &sh->dev[s->failed_num[0]];
3828 s->locked++;
3829 set_bit(R5_LOCKED, &dev->flags);
3830 set_bit(R5_Wantwrite, &dev->flags);
3831 }
3832 if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) {
3833 dev = &sh->dev[pd_idx];
3834 s->locked++;
3835 set_bit(R5_LOCKED, &dev->flags);
3836 set_bit(R5_Wantwrite, &dev->flags);
3837 }
3838 if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) {
3839 dev = &sh->dev[qd_idx];
3840 s->locked++;
3841 set_bit(R5_LOCKED, &dev->flags);
3842 set_bit(R5_Wantwrite, &dev->flags);
3843 }
3844 clear_bit(STRIPE_DEGRADED, &sh->state);
3845
3846 set_bit(STRIPE_INSYNC, &sh->state);
3847 break;
3848 case check_state_run:
3849 case check_state_run_q:
3850 case check_state_run_pq:
3851 break;
3852 case check_state_check_result:
3853 sh->check_state = check_state_idle;
3854
3855
3856
3857
3858
3859 if (sh->ops.zero_sum_result == 0) {
3860
3861 if (!s->failed)
3862 set_bit(STRIPE_INSYNC, &sh->state);
3863 else {
3864
3865
3866
3867
3868 sh->check_state = check_state_compute_result;
3869
3870
3871
3872
3873
3874 }
3875 } else {
3876 atomic64_add(STRIPE_SECTORS, &conf->mddev->resync_mismatches);
3877 if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery))
3878
3879 set_bit(STRIPE_INSYNC, &sh->state);
3880 else {
3881 int *target = &sh->ops.target;
3882
3883 sh->ops.target = -1;
3884 sh->ops.target2 = -1;
3885 sh->check_state = check_state_compute_run;
3886 set_bit(STRIPE_COMPUTE_RUN, &sh->state);
3887 set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request);
3888 if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) {
3889 set_bit(R5_Wantcompute,
3890 &sh->dev[pd_idx].flags);
3891 *target = pd_idx;
3892 target = &sh->ops.target2;
3893 s->uptodate++;
3894 }
3895 if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) {
3896 set_bit(R5_Wantcompute,
3897 &sh->dev[qd_idx].flags);
3898 *target = qd_idx;
3899 s->uptodate++;
3900 }
3901 }
3902 }
3903 break;
3904 case check_state_compute_run:
3905 break;
3906 default:
3907 printk(KERN_ERR "%s: unknown check_state: %d sector: %llu\n",
3908 __func__, sh->check_state,
3909 (unsigned long long) sh->sector);
3910 BUG();
3911 }
3912}
3913
3914static void handle_stripe_expansion(struct r5conf *conf, struct stripe_head *sh)
3915{
3916 int i;
3917
3918
3919
3920
3921 struct dma_async_tx_descriptor *tx = NULL;
3922 BUG_ON(sh->batch_head);
3923 clear_bit(STRIPE_EXPAND_SOURCE, &sh->state);
3924 for (i = 0; i < sh->disks; i++)
3925 if (i != sh->pd_idx && i != sh->qd_idx) {
3926 int dd_idx, j;
3927 struct stripe_head *sh2;
3928 struct async_submit_ctl submit;
3929
3930 sector_t bn = compute_blocknr(sh, i, 1);
3931 sector_t s = raid5_compute_sector(conf, bn, 0,
3932 &dd_idx, NULL);
3933 sh2 = get_active_stripe(conf, s, 0, 1, 1);
3934 if (sh2 == NULL)
3935
3936
3937
3938
3939 continue;
3940 if (!test_bit(STRIPE_EXPANDING, &sh2->state) ||
3941 test_bit(R5_Expanded, &sh2->dev[dd_idx].flags)) {
3942
3943 release_stripe(sh2);
3944 continue;
3945 }
3946
3947
3948 init_async_submit(&submit, 0, tx, NULL, NULL, NULL);
3949 tx = async_memcpy(sh2->dev[dd_idx].page,
3950 sh->dev[i].page, 0, 0, STRIPE_SIZE,
3951 &submit);
3952
3953 set_bit(R5_Expanded, &sh2->dev[dd_idx].flags);
3954 set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags);
3955 for (j = 0; j < conf->raid_disks; j++)
3956 if (j != sh2->pd_idx &&
3957 j != sh2->qd_idx &&
3958 !test_bit(R5_Expanded, &sh2->dev[j].flags))
3959 break;
3960 if (j == conf->raid_disks) {
3961 set_bit(STRIPE_EXPAND_READY, &sh2->state);
3962 set_bit(STRIPE_HANDLE, &sh2->state);
3963 }
3964 release_stripe(sh2);
3965
3966 }
3967
3968 async_tx_quiesce(&tx);
3969}
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s)
3986{
3987 struct r5conf *conf = sh->raid_conf;
3988 int disks = sh->disks;
3989 struct r5dev *dev;
3990 int i;
3991 int do_recovery = 0;
3992
3993 memset(s, 0, sizeof(*s));
3994
3995 s->expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state) && !sh->batch_head;
3996 s->expanded = test_bit(STRIPE_EXPAND_READY, &sh->state) && !sh->batch_head;
3997 s->failed_num[0] = -1;
3998 s->failed_num[1] = -1;
3999
4000
4001 rcu_read_lock();
4002 for (i=disks; i--; ) {
4003 struct md_rdev *rdev;
4004 sector_t first_bad;
4005 int bad_sectors;
4006 int is_bad = 0;
4007
4008 dev = &sh->dev[i];
4009
4010 pr_debug("check %d: state 0x%lx read %p write %p written %p\n",
4011 i, dev->flags,
4012 dev->toread, dev->towrite, dev->written);
4013
4014
4015
4016
4017
4018 if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread &&
4019 !test_bit(STRIPE_BIOFILL_RUN, &sh->state))
4020 set_bit(R5_Wantfill, &dev->flags);
4021
4022
4023 if (test_bit(R5_LOCKED, &dev->flags))
4024 s->locked++;
4025 if (test_bit(R5_UPTODATE, &dev->flags))
4026 s->uptodate++;
4027 if (test_bit(R5_Wantcompute, &dev->flags)) {
4028 s->compute++;
4029 BUG_ON(s->compute > 2);
4030 }
4031
4032 if (test_bit(R5_Wantfill, &dev->flags))
4033 s->to_fill++;
4034 else if (dev->toread)
4035 s->to_read++;
4036 if (dev->towrite) {
4037 s->to_write++;
4038 if (!test_bit(R5_OVERWRITE, &dev->flags))
4039 s->non_overwrite++;
4040 }
4041 if (dev->written)
4042 s->written++;
4043
4044
4045
4046 rdev = rcu_dereference(conf->disks[i].replacement);
4047 if (rdev && !test_bit(Faulty, &rdev->flags) &&
4048 rdev->recovery_offset >= sh->sector + STRIPE_SECTORS &&
4049 !is_badblock(rdev, sh->sector, STRIPE_SECTORS,
4050 &first_bad, &bad_sectors))
4051 set_bit(R5_ReadRepl, &dev->flags);
4052 else {
4053 if (rdev)
4054 set_bit(R5_NeedReplace, &dev->flags);
4055 rdev = rcu_dereference(conf->disks[i].rdev);
4056 clear_bit(R5_ReadRepl, &dev->flags);
4057 }
4058 if (rdev && test_bit(Faulty, &rdev->flags))
4059 rdev = NULL;
4060 if (rdev) {
4061 is_bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS,
4062 &first_bad, &bad_sectors);
4063 if (s->blocked_rdev == NULL
4064 && (test_bit(Blocked, &rdev->flags)
4065 || is_bad < 0)) {
4066 if (is_bad < 0)
4067 set_bit(BlockedBadBlocks,
4068 &rdev->flags);
4069 s->blocked_rdev = rdev;
4070 atomic_inc(&rdev->nr_pending);
4071 }
4072 }
4073 clear_bit(R5_Insync, &dev->flags);
4074 if (!rdev)
4075 ;
4076 else if (is_bad) {
4077
4078 if (!test_bit(WriteErrorSeen, &rdev->flags) &&
4079 test_bit(R5_UPTODATE, &dev->flags)) {
4080
4081
4082
4083 set_bit(R5_Insync, &dev->flags);
4084 set_bit(R5_ReadError, &dev->flags);
4085 }
4086 } else if (test_bit(In_sync, &rdev->flags))
4087 set_bit(R5_Insync, &dev->flags);
4088 else if (sh->sector + STRIPE_SECTORS <= rdev->recovery_offset)
4089
4090 set_bit(R5_Insync, &dev->flags);
4091 else if (test_bit(R5_UPTODATE, &dev->flags) &&
4092 test_bit(R5_Expanded, &dev->flags))
4093
4094
4095
4096
4097 set_bit(R5_Insync, &dev->flags);
4098
4099 if (test_bit(R5_WriteError, &dev->flags)) {
4100
4101
4102 struct md_rdev *rdev2 = rcu_dereference(
4103 conf->disks[i].rdev);
4104 if (rdev2 == rdev)
4105 clear_bit(R5_Insync, &dev->flags);
4106 if (rdev2 && !test_bit(Faulty, &rdev2->flags)) {
4107 s->handle_bad_blocks = 1;
4108 atomic_inc(&rdev2->nr_pending);
4109 } else
4110 clear_bit(R5_WriteError, &dev->flags);
4111 }
4112 if (test_bit(R5_MadeGood, &dev->flags)) {
4113
4114
4115 struct md_rdev *rdev2 = rcu_dereference(
4116 conf->disks[i].rdev);
4117 if (rdev2 && !test_bit(Faulty, &rdev2->flags)) {
4118 s->handle_bad_blocks = 1;
4119 atomic_inc(&rdev2->nr_pending);
4120 } else
4121 clear_bit(R5_MadeGood, &dev->flags);
4122 }
4123 if (test_bit(R5_MadeGoodRepl, &dev->flags)) {
4124 struct md_rdev *rdev2 = rcu_dereference(
4125 conf->disks[i].replacement);
4126 if (rdev2 && !test_bit(Faulty, &rdev2->flags)) {
4127 s->handle_bad_blocks = 1;
4128 atomic_inc(&rdev2->nr_pending);
4129 } else
4130 clear_bit(R5_MadeGoodRepl, &dev->flags);
4131 }
4132 if (!test_bit(R5_Insync, &dev->flags)) {
4133
4134 clear_bit(R5_ReadError, &dev->flags);
4135 clear_bit(R5_ReWrite, &dev->flags);
4136 }
4137 if (test_bit(R5_ReadError, &dev->flags))
4138 clear_bit(R5_Insync, &dev->flags);
4139 if (!test_bit(R5_Insync, &dev->flags)) {
4140 if (s->failed < 2)
4141 s->failed_num[s->failed] = i;
4142 s->failed++;
4143 if (rdev && !test_bit(Faulty, &rdev->flags))
4144 do_recovery = 1;
4145 }
4146 }
4147 if (test_bit(STRIPE_SYNCING, &sh->state)) {
4148
4149
4150
4151
4152
4153
4154
4155
4156 if (do_recovery ||
4157 sh->sector >= conf->mddev->recovery_cp ||
4158 test_bit(MD_RECOVERY_REQUESTED, &(conf->mddev->recovery)))
4159 s->syncing = 1;
4160 else
4161 s->replacing = 1;
4162 }
4163 rcu_read_unlock();
4164}
4165
4166static int clear_batch_ready(struct stripe_head *sh)
4167{
4168
4169
4170
4171
4172 struct stripe_head *tmp;
4173 if (!test_and_clear_bit(STRIPE_BATCH_READY, &sh->state))
4174 return (sh->batch_head && sh->batch_head != sh);
4175 spin_lock(&sh->stripe_lock);
4176 if (!sh->batch_head) {
4177 spin_unlock(&sh->stripe_lock);
4178 return 0;
4179 }
4180
4181
4182
4183
4184
4185 if (sh->batch_head != sh) {
4186 spin_unlock(&sh->stripe_lock);
4187 return 1;
4188 }
4189 spin_lock(&sh->batch_lock);
4190 list_for_each_entry(tmp, &sh->batch_list, batch_list)
4191 clear_bit(STRIPE_BATCH_READY, &tmp->state);
4192 spin_unlock(&sh->batch_lock);
4193 spin_unlock(&sh->stripe_lock);
4194
4195
4196
4197
4198
4199 return 0;
4200}
4201
4202static void break_stripe_batch_list(struct stripe_head *head_sh,
4203 unsigned long handle_flags)
4204{
4205 struct stripe_head *sh, *next;
4206 int i;
4207 int do_wakeup = 0;
4208
4209 list_for_each_entry_safe(sh, next, &head_sh->batch_list, batch_list) {
4210
4211 list_del_init(&sh->batch_list);
4212
4213 WARN_ON_ONCE(sh->state & ((1 << STRIPE_ACTIVE) |
4214 (1 << STRIPE_SYNCING) |
4215 (1 << STRIPE_REPLACED) |
4216 (1 << STRIPE_PREREAD_ACTIVE) |
4217 (1 << STRIPE_DELAYED) |
4218 (1 << STRIPE_BIT_DELAY) |
4219 (1 << STRIPE_FULL_WRITE) |
4220 (1 << STRIPE_BIOFILL_RUN) |
4221 (1 << STRIPE_COMPUTE_RUN) |
4222 (1 << STRIPE_OPS_REQ_PENDING) |
4223 (1 << STRIPE_DISCARD) |
4224 (1 << STRIPE_BATCH_READY) |
4225 (1 << STRIPE_BATCH_ERR) |
4226 (1 << STRIPE_BITMAP_PENDING)));
4227 WARN_ON_ONCE(head_sh->state & ((1 << STRIPE_DISCARD) |
4228 (1 << STRIPE_REPLACED)));
4229
4230 set_mask_bits(&sh->state, ~(STRIPE_EXPAND_SYNC_FLAGS |
4231 (1 << STRIPE_DEGRADED)),
4232 head_sh->state & (1 << STRIPE_INSYNC));
4233
4234 sh->check_state = head_sh->check_state;
4235 sh->reconstruct_state = head_sh->reconstruct_state;
4236 for (i = 0; i < sh->disks; i++) {
4237 if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags))
4238 do_wakeup = 1;
4239 sh->dev[i].flags = head_sh->dev[i].flags &
4240 (~((1 << R5_WriteError) | (1 << R5_Overlap)));
4241 }
4242 spin_lock_irq(&sh->stripe_lock);
4243 sh->batch_head = NULL;
4244 spin_unlock_irq(&sh->stripe_lock);
4245 if (handle_flags == 0 ||
4246 sh->state & handle_flags)
4247 set_bit(STRIPE_HANDLE, &sh->state);
4248 release_stripe(sh);
4249 }
4250 spin_lock_irq(&head_sh->stripe_lock);
4251 head_sh->batch_head = NULL;
4252 spin_unlock_irq(&head_sh->stripe_lock);
4253 for (i = 0; i < head_sh->disks; i++)
4254 if (test_and_clear_bit(R5_Overlap, &head_sh->dev[i].flags))
4255 do_wakeup = 1;
4256 if (head_sh->state & handle_flags)
4257 set_bit(STRIPE_HANDLE, &head_sh->state);
4258
4259 if (do_wakeup)
4260 wake_up(&head_sh->raid_conf->wait_for_overlap);
4261}
4262
4263static void handle_stripe(struct stripe_head *sh)
4264{
4265 struct stripe_head_state s;
4266 struct r5conf *conf = sh->raid_conf;
4267 int i;
4268 int prexor;
4269 int disks = sh->disks;
4270 struct r5dev *pdev, *qdev;
4271
4272 clear_bit(STRIPE_HANDLE, &sh->state);
4273 if (test_and_set_bit_lock(STRIPE_ACTIVE, &sh->state)) {
4274
4275
4276 set_bit(STRIPE_HANDLE, &sh->state);
4277 return;
4278 }
4279
4280 if (clear_batch_ready(sh) ) {
4281 clear_bit_unlock(STRIPE_ACTIVE, &sh->state);
4282 return;
4283 }
4284
4285 if (test_and_clear_bit(STRIPE_BATCH_ERR, &sh->state))
4286 break_stripe_batch_list(sh, 0);
4287
4288 if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state) && !sh->batch_head) {
4289 spin_lock(&sh->stripe_lock);
4290
4291 if (!test_bit(STRIPE_DISCARD, &sh->state) &&
4292 test_and_clear_bit(STRIPE_SYNC_REQUESTED, &sh->state)) {
4293 set_bit(STRIPE_SYNCING, &sh->state);
4294 clear_bit(STRIPE_INSYNC, &sh->state);
4295 clear_bit(STRIPE_REPLACED, &sh->state);
4296 }
4297 spin_unlock(&sh->stripe_lock);
4298 }
4299 clear_bit(STRIPE_DELAYED, &sh->state);
4300
4301 pr_debug("handling stripe %llu, state=%#lx cnt=%d, "
4302 "pd_idx=%d, qd_idx=%d\n, check:%d, reconstruct:%d\n",
4303 (unsigned long long)sh->sector, sh->state,
4304 atomic_read(&sh->count), sh->pd_idx, sh->qd_idx,
4305 sh->check_state, sh->reconstruct_state);
4306
4307 analyse_stripe(sh, &s);
4308
4309 if (s.handle_bad_blocks) {
4310 set_bit(STRIPE_HANDLE, &sh->state);
4311 goto finish;
4312 }
4313
4314 if (unlikely(s.blocked_rdev)) {
4315 if (s.syncing || s.expanding || s.expanded ||
4316 s.replacing || s.to_write || s.written) {
4317 set_bit(STRIPE_HANDLE, &sh->state);
4318 goto finish;
4319 }
4320
4321 rdev_dec_pending(s.blocked_rdev, conf->mddev);
4322 s.blocked_rdev = NULL;
4323 }
4324
4325 if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) {
4326 set_bit(STRIPE_OP_BIOFILL, &s.ops_request);
4327 set_bit(STRIPE_BIOFILL_RUN, &sh->state);
4328 }
4329
4330 pr_debug("locked=%d uptodate=%d to_read=%d"
4331 " to_write=%d failed=%d failed_num=%d,%d\n",
4332 s.locked, s.uptodate, s.to_read, s.to_write, s.failed,
4333 s.failed_num[0], s.failed_num[1]);
4334
4335
4336
4337 if (s.failed > conf->max_degraded) {
4338 sh->check_state = 0;
4339 sh->reconstruct_state = 0;
4340 break_stripe_batch_list(sh, 0);
4341 if (s.to_read+s.to_write+s.written)
4342 handle_failed_stripe(conf, sh, &s, disks, &s.return_bi);
4343 if (s.syncing + s.replacing)
4344 handle_failed_sync(conf, sh, &s);
4345 }
4346
4347
4348
4349
4350 prexor = 0;
4351 if (sh->reconstruct_state == reconstruct_state_prexor_drain_result)
4352 prexor = 1;
4353 if (sh->reconstruct_state == reconstruct_state_drain_result ||
4354 sh->reconstruct_state == reconstruct_state_prexor_drain_result) {
4355 sh->reconstruct_state = reconstruct_state_idle;
4356
4357
4358
4359
4360 BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags) &&
4361 !test_bit(R5_Discard, &sh->dev[sh->pd_idx].flags));
4362 BUG_ON(sh->qd_idx >= 0 &&
4363 !test_bit(R5_UPTODATE, &sh->dev[sh->qd_idx].flags) &&
4364 !test_bit(R5_Discard, &sh->dev[sh->qd_idx].flags));
4365 for (i = disks; i--; ) {
4366 struct r5dev *dev = &sh->dev[i];
4367 if (test_bit(R5_LOCKED, &dev->flags) &&
4368 (i == sh->pd_idx || i == sh->qd_idx ||
4369 dev->written)) {
4370 pr_debug("Writing block %d\n", i);
4371 set_bit(R5_Wantwrite, &dev->flags);
4372 if (prexor)
4373 continue;
4374 if (s.failed > 1)
4375 continue;
4376 if (!test_bit(R5_Insync, &dev->flags) ||
4377 ((i == sh->pd_idx || i == sh->qd_idx) &&
4378 s.failed == 0))
4379 set_bit(STRIPE_INSYNC, &sh->state);
4380 }
4381 }
4382 if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
4383 s.dec_preread_active = 1;
4384 }
4385
4386
4387
4388
4389
4390 pdev = &sh->dev[sh->pd_idx];
4391 s.p_failed = (s.failed >= 1 && s.failed_num[0] == sh->pd_idx)
4392 || (s.failed >= 2 && s.failed_num[1] == sh->pd_idx);
4393 qdev = &sh->dev[sh->qd_idx];
4394 s.q_failed = (s.failed >= 1 && s.failed_num[0] == sh->qd_idx)
4395 || (s.failed >= 2 && s.failed_num[1] == sh->qd_idx)
4396 || conf->level < 6;
4397
4398 if (s.written &&
4399 (s.p_failed || ((test_bit(R5_Insync, &pdev->flags)
4400 && !test_bit(R5_LOCKED, &pdev->flags)
4401 && (test_bit(R5_UPTODATE, &pdev->flags) ||
4402 test_bit(R5_Discard, &pdev->flags))))) &&
4403 (s.q_failed || ((test_bit(R5_Insync, &qdev->flags)
4404 && !test_bit(R5_LOCKED, &qdev->flags)
4405 && (test_bit(R5_UPTODATE, &qdev->flags) ||
4406 test_bit(R5_Discard, &qdev->flags))))))
4407 handle_stripe_clean_event(conf, sh, disks, &s.return_bi);
4408
4409
4410
4411
4412
4413 if (s.to_read || s.non_overwrite
4414 || (conf->level == 6 && s.to_write && s.failed)
4415 || (s.syncing && (s.uptodate + s.compute < disks))
4416 || s.replacing
4417 || s.expanding)
4418 handle_stripe_fill(sh, &s, disks);
4419
4420
4421
4422
4423
4424
4425
4426 if (s.to_write && !sh->reconstruct_state && !sh->check_state)
4427 handle_stripe_dirtying(conf, sh, &s, disks);
4428
4429
4430
4431
4432
4433
4434 if (sh->check_state ||
4435 (s.syncing && s.locked == 0 &&
4436 !test_bit(STRIPE_COMPUTE_RUN, &sh->state) &&
4437 !test_bit(STRIPE_INSYNC, &sh->state))) {
4438 if (conf->level == 6)
4439 handle_parity_checks6(conf, sh, &s, disks);
4440 else
4441 handle_parity_checks5(conf, sh, &s, disks);
4442 }
4443
4444 if ((s.replacing || s.syncing) && s.locked == 0
4445 && !test_bit(STRIPE_COMPUTE_RUN, &sh->state)
4446 && !test_bit(STRIPE_REPLACED, &sh->state)) {
4447
4448 for (i = 0; i < conf->raid_disks; i++)
4449 if (test_bit(R5_NeedReplace, &sh->dev[i].flags)) {
4450 WARN_ON(!test_bit(R5_UPTODATE, &sh->dev[i].flags));
4451 set_bit(R5_WantReplace, &sh->dev[i].flags);
4452 set_bit(R5_LOCKED, &sh->dev[i].flags);
4453 s.locked++;
4454 }
4455 if (s.replacing)
4456 set_bit(STRIPE_INSYNC, &sh->state);
4457 set_bit(STRIPE_REPLACED, &sh->state);
4458 }
4459 if ((s.syncing || s.replacing) && s.locked == 0 &&
4460 !test_bit(STRIPE_COMPUTE_RUN, &sh->state) &&
4461 test_bit(STRIPE_INSYNC, &sh->state)) {
4462 md_done_sync(conf->mddev, STRIPE_SECTORS, 1);
4463 clear_bit(STRIPE_SYNCING, &sh->state);
4464 if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags))
4465 wake_up(&conf->wait_for_overlap);
4466 }
4467
4468
4469
4470
4471 if (s.failed <= conf->max_degraded && !conf->mddev->ro)
4472 for (i = 0; i < s.failed; i++) {
4473 struct r5dev *dev = &sh->dev[s.failed_num[i]];
4474 if (test_bit(R5_ReadError, &dev->flags)
4475 && !test_bit(R5_LOCKED, &dev->flags)
4476 && test_bit(R5_UPTODATE, &dev->flags)
4477 ) {
4478 if (!test_bit(R5_ReWrite, &dev->flags)) {
4479 set_bit(R5_Wantwrite, &dev->flags);
4480 set_bit(R5_ReWrite, &dev->flags);
4481 set_bit(R5_LOCKED, &dev->flags);
4482 s.locked++;
4483 } else {
4484
4485 set_bit(R5_Wantread, &dev->flags);
4486 set_bit(R5_LOCKED, &dev->flags);
4487 s.locked++;
4488 }
4489 }
4490 }
4491
4492
4493 if (sh->reconstruct_state == reconstruct_state_result) {
4494 struct stripe_head *sh_src
4495 = get_active_stripe(conf, sh->sector, 1, 1, 1);
4496 if (sh_src && test_bit(STRIPE_EXPAND_SOURCE, &sh_src->state)) {
4497
4498
4499
4500 set_bit(STRIPE_DELAYED, &sh->state);
4501 set_bit(STRIPE_HANDLE, &sh->state);
4502 if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE,
4503 &sh_src->state))
4504 atomic_inc(&conf->preread_active_stripes);
4505 release_stripe(sh_src);
4506 goto finish;
4507 }
4508 if (sh_src)
4509 release_stripe(sh_src);
4510
4511 sh->reconstruct_state = reconstruct_state_idle;
4512 clear_bit(STRIPE_EXPANDING, &sh->state);
4513 for (i = conf->raid_disks; i--; ) {
4514 set_bit(R5_Wantwrite, &sh->dev[i].flags);
4515 set_bit(R5_LOCKED, &sh->dev[i].flags);
4516 s.locked++;
4517 }
4518 }
4519
4520 if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) &&
4521 !sh->reconstruct_state) {
4522
4523 sh->disks = conf->raid_disks;
4524 stripe_set_idx(sh->sector, conf, 0, sh);
4525 schedule_reconstruction(sh, &s, 1, 1);
4526 } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) {
4527 clear_bit(STRIPE_EXPAND_READY, &sh->state);
4528 atomic_dec(&conf->reshape_stripes);
4529 wake_up(&conf->wait_for_overlap);
4530 md_done_sync(conf->mddev, STRIPE_SECTORS, 1);
4531 }
4532
4533 if (s.expanding && s.locked == 0 &&
4534 !test_bit(STRIPE_COMPUTE_RUN, &sh->state))
4535 handle_stripe_expansion(conf, sh);
4536
4537finish:
4538
4539 if (unlikely(s.blocked_rdev)) {
4540 if (conf->mddev->external)
4541 md_wait_for_blocked_rdev(s.blocked_rdev,
4542 conf->mddev);
4543 else
4544
4545
4546
4547
4548 rdev_dec_pending(s.blocked_rdev,
4549 conf->mddev);
4550 }
4551
4552 if (s.handle_bad_blocks)
4553 for (i = disks; i--; ) {
4554 struct md_rdev *rdev;
4555 struct r5dev *dev = &sh->dev[i];
4556 if (test_and_clear_bit(R5_WriteError, &dev->flags)) {
4557
4558 rdev = conf->disks[i].rdev;
4559 if (!rdev_set_badblocks(rdev, sh->sector,
4560 STRIPE_SECTORS, 0))
4561 md_error(conf->mddev, rdev);
4562 rdev_dec_pending(rdev, conf->mddev);
4563 }
4564 if (test_and_clear_bit(R5_MadeGood, &dev->flags)) {
4565 rdev = conf->disks[i].rdev;
4566 rdev_clear_badblocks(rdev, sh->sector,
4567 STRIPE_SECTORS, 0);
4568 rdev_dec_pending(rdev, conf->mddev);
4569 }
4570 if (test_and_clear_bit(R5_MadeGoodRepl, &dev->flags)) {
4571 rdev = conf->disks[i].replacement;
4572 if (!rdev)
4573
4574 rdev = conf->disks[i].rdev;
4575 rdev_clear_badblocks(rdev, sh->sector,
4576 STRIPE_SECTORS, 0);
4577 rdev_dec_pending(rdev, conf->mddev);
4578 }
4579 }
4580
4581 if (s.ops_request)
4582 raid_run_ops(sh, s.ops_request);
4583
4584 ops_run_io(sh, &s);
4585
4586 if (s.dec_preread_active) {
4587
4588
4589
4590
4591 atomic_dec(&conf->preread_active_stripes);
4592 if (atomic_read(&conf->preread_active_stripes) <
4593 IO_THRESHOLD)
4594 md_wakeup_thread(conf->mddev->thread);
4595 }
4596
4597 return_io(s.return_bi);
4598
4599 clear_bit_unlock(STRIPE_ACTIVE, &sh->state);
4600}
4601
4602static void raid5_activate_delayed(struct r5conf *conf)
4603{
4604 if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) {
4605 while (!list_empty(&conf->delayed_list)) {
4606 struct list_head *l = conf->delayed_list.next;
4607 struct stripe_head *sh;
4608 sh = list_entry(l, struct stripe_head, lru);
4609 list_del_init(l);
4610 clear_bit(STRIPE_DELAYED, &sh->state);
4611 if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
4612 atomic_inc(&conf->preread_active_stripes);
4613 list_add_tail(&sh->lru, &conf->hold_list);
4614 raid5_wakeup_stripe_thread(sh);
4615 }
4616 }
4617}
4618
4619static void activate_bit_delay(struct r5conf *conf,
4620 struct list_head *temp_inactive_list)
4621{
4622
4623 struct list_head head;
4624 list_add(&head, &conf->bitmap_list);
4625 list_del_init(&conf->bitmap_list);
4626 while (!list_empty(&head)) {
4627 struct stripe_head *sh = list_entry(head.next, struct stripe_head, lru);
4628 int hash;
4629 list_del_init(&sh->lru);
4630 atomic_inc(&sh->count);
4631 hash = sh->hash_lock_index;
4632 __release_stripe(conf, sh, &temp_inactive_list[hash]);
4633 }
4634}
4635
4636static int raid5_congested(struct mddev *mddev, int bits)
4637{
4638 struct r5conf *conf = mddev->private;
4639
4640
4641
4642
4643
4644 if (test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state))
4645 return 1;
4646 if (conf->quiesce)
4647 return 1;
4648 if (atomic_read(&conf->empty_inactive_list_nr))
4649 return 1;
4650
4651 return 0;
4652}
4653
4654
4655
4656
4657static int raid5_mergeable_bvec(struct mddev *mddev,
4658 struct bvec_merge_data *bvm,
4659 struct bio_vec *biovec)
4660{
4661 sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev);
4662 int max;
4663 unsigned int chunk_sectors = mddev->chunk_sectors;
4664 unsigned int bio_sectors = bvm->bi_size >> 9;
4665
4666
4667
4668
4669
4670 if ((bvm->bi_rw & 1) == WRITE || mddev->degraded)
4671 return biovec->bv_len;
4672
4673 if (mddev->new_chunk_sectors < mddev->chunk_sectors)
4674 chunk_sectors = mddev->new_chunk_sectors;
4675 max = (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9;
4676 if (max < 0) max = 0;
4677 if (max <= biovec->bv_len && bio_sectors == 0)
4678 return biovec->bv_len;
4679 else
4680 return max;
4681}
4682
4683static int in_chunk_boundary(struct mddev *mddev, struct bio *bio)
4684{
4685 sector_t sector = bio->bi_iter.bi_sector + get_start_sect(bio->bi_bdev);
4686 unsigned int chunk_sectors = mddev->chunk_sectors;
4687 unsigned int bio_sectors = bio_sectors(bio);
4688
4689 if (mddev->new_chunk_sectors < mddev->chunk_sectors)
4690 chunk_sectors = mddev->new_chunk_sectors;
4691 return chunk_sectors >=
4692 ((sector & (chunk_sectors - 1)) + bio_sectors);
4693}
4694
4695
4696
4697
4698
4699static void add_bio_to_retry(struct bio *bi,struct r5conf *conf)
4700{
4701 unsigned long flags;
4702
4703 spin_lock_irqsave(&conf->device_lock, flags);
4704
4705 bi->bi_next = conf->retry_read_aligned_list;
4706 conf->retry_read_aligned_list = bi;
4707
4708 spin_unlock_irqrestore(&conf->device_lock, flags);
4709 md_wakeup_thread(conf->mddev->thread);
4710}
4711
4712static struct bio *remove_bio_from_retry(struct r5conf *conf)
4713{
4714 struct bio *bi;
4715
4716 bi = conf->retry_read_aligned;
4717 if (bi) {
4718 conf->retry_read_aligned = NULL;
4719 return bi;
4720 }
4721 bi = conf->retry_read_aligned_list;
4722 if(bi) {
4723 conf->retry_read_aligned_list = bi->bi_next;
4724 bi->bi_next = NULL;
4725
4726
4727
4728
4729 raid5_set_bi_stripes(bi, 1);
4730 }
4731
4732 return bi;
4733}
4734
4735
4736
4737
4738
4739
4740
4741static void raid5_align_endio(struct bio *bi, int error)
4742{
4743 struct bio* raid_bi = bi->bi_private;
4744 struct mddev *mddev;
4745 struct r5conf *conf;
4746 int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags);
4747 struct md_rdev *rdev;
4748
4749 bio_put(bi);
4750
4751 rdev = (void*)raid_bi->bi_next;
4752 raid_bi->bi_next = NULL;
4753 mddev = rdev->mddev;
4754 conf = mddev->private;
4755
4756 rdev_dec_pending(rdev, conf->mddev);
4757
4758 if (!error && uptodate) {
4759 trace_block_bio_complete(bdev_get_queue(raid_bi->bi_bdev),
4760 raid_bi, 0);
4761 bio_endio(raid_bi, 0);
4762 if (atomic_dec_and_test(&conf->active_aligned_reads))
4763 wake_up(&conf->wait_for_stripe);
4764 return;
4765 }
4766
4767 pr_debug("raid5_align_endio : io error...handing IO for a retry\n");
4768
4769 add_bio_to_retry(raid_bi, conf);
4770}
4771
4772static int bio_fits_rdev(struct bio *bi)
4773{
4774 struct request_queue *q = bdev_get_queue(bi->bi_bdev);
4775
4776 if (bio_sectors(bi) > queue_max_sectors(q))
4777 return 0;
4778 blk_recount_segments(q, bi);
4779 if (bi->bi_phys_segments > queue_max_segments(q))
4780 return 0;
4781
4782 if (q->merge_bvec_fn)
4783
4784
4785
4786 return 0;
4787
4788 return 1;
4789}
4790
4791static int chunk_aligned_read(struct mddev *mddev, struct bio * raid_bio)
4792{
4793 struct r5conf *conf = mddev->private;
4794 int dd_idx;
4795 struct bio* align_bi;
4796 struct md_rdev *rdev;
4797 sector_t end_sector;
4798
4799 if (!in_chunk_boundary(mddev, raid_bio)) {
4800 pr_debug("chunk_aligned_read : non aligned\n");
4801 return 0;
4802 }
4803
4804
4805
4806 align_bi = bio_clone_mddev(raid_bio, GFP_NOIO, mddev);
4807 if (!align_bi)
4808 return 0;
4809
4810
4811
4812
4813 align_bi->bi_end_io = raid5_align_endio;
4814 align_bi->bi_private = raid_bio;
4815
4816
4817
4818 align_bi->bi_iter.bi_sector =
4819 raid5_compute_sector(conf, raid_bio->bi_iter.bi_sector,
4820 0, &dd_idx, NULL);
4821
4822 end_sector = bio_end_sector(align_bi);
4823 rcu_read_lock();
4824 rdev = rcu_dereference(conf->disks[dd_idx].replacement);
4825 if (!rdev || test_bit(Faulty, &rdev->flags) ||
4826 rdev->recovery_offset < end_sector) {
4827 rdev = rcu_dereference(conf->disks[dd_idx].rdev);
4828 if (rdev &&
4829 (test_bit(Faulty, &rdev->flags) ||
4830 !(test_bit(In_sync, &rdev->flags) ||
4831 rdev->recovery_offset >= end_sector)))
4832 rdev = NULL;
4833 }
4834 if (rdev) {
4835 sector_t first_bad;
4836 int bad_sectors;
4837
4838 atomic_inc(&rdev->nr_pending);
4839 rcu_read_unlock();
4840 raid_bio->bi_next = (void*)rdev;
4841 align_bi->bi_bdev = rdev->bdev;
4842 __clear_bit(BIO_SEG_VALID, &align_bi->bi_flags);
4843
4844 if (!bio_fits_rdev(align_bi) ||
4845 is_badblock(rdev, align_bi->bi_iter.bi_sector,
4846 bio_sectors(align_bi),
4847 &first_bad, &bad_sectors)) {
4848
4849 bio_put(align_bi);
4850 rdev_dec_pending(rdev, mddev);
4851 return 0;
4852 }
4853
4854
4855 align_bi->bi_iter.bi_sector += rdev->data_offset;
4856
4857 spin_lock_irq(&conf->device_lock);
4858 wait_event_lock_irq(conf->wait_for_stripe,
4859 conf->quiesce == 0,
4860 conf->device_lock);
4861 atomic_inc(&conf->active_aligned_reads);
4862 spin_unlock_irq(&conf->device_lock);
4863
4864 if (mddev->gendisk)
4865 trace_block_bio_remap(bdev_get_queue(align_bi->bi_bdev),
4866 align_bi, disk_devt(mddev->gendisk),
4867 raid_bio->bi_iter.bi_sector);
4868 generic_make_request(align_bi);
4869 return 1;
4870 } else {
4871 rcu_read_unlock();
4872 bio_put(align_bi);
4873 return 0;
4874 }
4875}
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887static struct stripe_head *__get_priority_stripe(struct r5conf *conf, int group)
4888{
4889 struct stripe_head *sh = NULL, *tmp;
4890 struct list_head *handle_list = NULL;
4891 struct r5worker_group *wg = NULL;
4892
4893 if (conf->worker_cnt_per_group == 0) {
4894 handle_list = &conf->handle_list;
4895 } else if (group != ANY_GROUP) {
4896 handle_list = &conf->worker_groups[group].handle_list;
4897 wg = &conf->worker_groups[group];
4898 } else {
4899 int i;
4900 for (i = 0; i < conf->group_cnt; i++) {
4901 handle_list = &conf->worker_groups[i].handle_list;
4902 wg = &conf->worker_groups[i];
4903 if (!list_empty(handle_list))
4904 break;
4905 }
4906 }
4907
4908 pr_debug("%s: handle: %s hold: %s full_writes: %d bypass_count: %d\n",
4909 __func__,
4910 list_empty(handle_list) ? "empty" : "busy",
4911 list_empty(&conf->hold_list) ? "empty" : "busy",
4912 atomic_read(&conf->pending_full_writes), conf->bypass_count);
4913
4914 if (!list_empty(handle_list)) {
4915 sh = list_entry(handle_list->next, typeof(*sh), lru);
4916
4917 if (list_empty(&conf->hold_list))
4918 conf->bypass_count = 0;
4919 else if (!test_bit(STRIPE_IO_STARTED, &sh->state)) {
4920 if (conf->hold_list.next == conf->last_hold)
4921 conf->bypass_count++;
4922 else {
4923 conf->last_hold = conf->hold_list.next;
4924 conf->bypass_count -= conf->bypass_threshold;
4925 if (conf->bypass_count < 0)
4926 conf->bypass_count = 0;
4927 }
4928 }
4929 } else if (!list_empty(&conf->hold_list) &&
4930 ((conf->bypass_threshold &&
4931 conf->bypass_count > conf->bypass_threshold) ||
4932 atomic_read(&conf->pending_full_writes) == 0)) {
4933
4934 list_for_each_entry(tmp, &conf->hold_list, lru) {
4935 if (conf->worker_cnt_per_group == 0 ||
4936 group == ANY_GROUP ||
4937 !cpu_online(tmp->cpu) ||
4938 cpu_to_group(tmp->cpu) == group) {
4939 sh = tmp;
4940 break;
4941 }
4942 }
4943
4944 if (sh) {
4945 conf->bypass_count -= conf->bypass_threshold;
4946 if (conf->bypass_count < 0)
4947 conf->bypass_count = 0;
4948 }
4949 wg = NULL;
4950 }
4951
4952 if (!sh)
4953 return NULL;
4954
4955 if (wg) {
4956 wg->stripes_cnt--;
4957 sh->group = NULL;
4958 }
4959 list_del_init(&sh->lru);
4960 BUG_ON(atomic_inc_return(&sh->count) != 1);
4961 return sh;
4962}
4963
4964struct raid5_plug_cb {
4965 struct blk_plug_cb cb;
4966 struct list_head list;
4967 struct list_head temp_inactive_list[NR_STRIPE_HASH_LOCKS];
4968};
4969
4970static void raid5_unplug(struct blk_plug_cb *blk_cb, bool from_schedule)
4971{
4972 struct raid5_plug_cb *cb = container_of(
4973 blk_cb, struct raid5_plug_cb, cb);
4974 struct stripe_head *sh;
4975 struct mddev *mddev = cb->cb.data;
4976 struct r5conf *conf = mddev->private;
4977 int cnt = 0;
4978 int hash;
4979
4980 if (cb->list.next && !list_empty(&cb->list)) {
4981 spin_lock_irq(&conf->device_lock);
4982 while (!list_empty(&cb->list)) {
4983 sh = list_first_entry(&cb->list, struct stripe_head, lru);
4984 list_del_init(&sh->lru);
4985
4986
4987
4988
4989
4990 smp_mb__before_atomic();
4991 clear_bit(STRIPE_ON_UNPLUG_LIST, &sh->state);
4992
4993
4994
4995
4996 hash = sh->hash_lock_index;
4997 __release_stripe(conf, sh, &cb->temp_inactive_list[hash]);
4998 cnt++;
4999 }
5000 spin_unlock_irq(&conf->device_lock);
5001 }
5002 release_inactive_stripe_list(conf, cb->temp_inactive_list,
5003 NR_STRIPE_HASH_LOCKS);
5004 if (mddev->queue)
5005 trace_block_unplug(mddev->queue, cnt, !from_schedule);
5006 kfree(cb);
5007}
5008
5009static void release_stripe_plug(struct mddev *mddev,
5010 struct stripe_head *sh)
5011{
5012 struct blk_plug_cb *blk_cb = blk_check_plugged(
5013 raid5_unplug, mddev,
5014 sizeof(struct raid5_plug_cb));
5015 struct raid5_plug_cb *cb;
5016
5017 if (!blk_cb) {
5018 release_stripe(sh);
5019 return;
5020 }
5021
5022 cb = container_of(blk_cb, struct raid5_plug_cb, cb);
5023
5024 if (cb->list.next == NULL) {
5025 int i;
5026 INIT_LIST_HEAD(&cb->list);
5027 for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++)
5028 INIT_LIST_HEAD(cb->temp_inactive_list + i);
5029 }
5030
5031 if (!test_and_set_bit(STRIPE_ON_UNPLUG_LIST, &sh->state))
5032 list_add_tail(&sh->lru, &cb->list);
5033 else
5034 release_stripe(sh);
5035}
5036
5037static void make_discard_request(struct mddev *mddev, struct bio *bi)
5038{
5039 struct r5conf *conf = mddev->private;
5040 sector_t logical_sector, last_sector;
5041 struct stripe_head *sh;
5042 int remaining;
5043 int stripe_sectors;
5044
5045 if (mddev->reshape_position != MaxSector)
5046
5047 return;
5048
5049 logical_sector = bi->bi_iter.bi_sector & ~((sector_t)STRIPE_SECTORS-1);
5050 last_sector = bi->bi_iter.bi_sector + (bi->bi_iter.bi_size>>9);
5051
5052 bi->bi_next = NULL;
5053 bi->bi_phys_segments = 1;
5054
5055 stripe_sectors = conf->chunk_sectors *
5056 (conf->raid_disks - conf->max_degraded);
5057 logical_sector = DIV_ROUND_UP_SECTOR_T(logical_sector,
5058 stripe_sectors);
5059 sector_div(last_sector, stripe_sectors);
5060
5061 logical_sector *= conf->chunk_sectors;
5062 last_sector *= conf->chunk_sectors;
5063
5064 for (; logical_sector < last_sector;
5065 logical_sector += STRIPE_SECTORS) {
5066 DEFINE_WAIT(w);
5067 int d;
5068 again:
5069 sh = get_active_stripe(conf, logical_sector, 0, 0, 0);
5070 prepare_to_wait(&conf->wait_for_overlap, &w,
5071 TASK_UNINTERRUPTIBLE);
5072 set_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags);
5073 if (test_bit(STRIPE_SYNCING, &sh->state)) {
5074 release_stripe(sh);
5075 schedule();
5076 goto again;
5077 }
5078 clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags);
5079 spin_lock_irq(&sh->stripe_lock);
5080 for (d = 0; d < conf->raid_disks; d++) {
5081 if (d == sh->pd_idx || d == sh->qd_idx)
5082 continue;
5083 if (sh->dev[d].towrite || sh->dev[d].toread) {
5084 set_bit(R5_Overlap, &sh->dev[d].flags);
5085 spin_unlock_irq(&sh->stripe_lock);
5086 release_stripe(sh);
5087 schedule();
5088 goto again;
5089 }
5090 }
5091 set_bit(STRIPE_DISCARD, &sh->state);
5092 finish_wait(&conf->wait_for_overlap, &w);
5093 sh->overwrite_disks = 0;
5094 for (d = 0; d < conf->raid_disks; d++) {
5095 if (d == sh->pd_idx || d == sh->qd_idx)
5096 continue;
5097 sh->dev[d].towrite = bi;
5098 set_bit(R5_OVERWRITE, &sh->dev[d].flags);
5099 raid5_inc_bi_active_stripes(bi);
5100 sh->overwrite_disks++;
5101 }
5102 spin_unlock_irq(&sh->stripe_lock);
5103 if (conf->mddev->bitmap) {
5104 for (d = 0;
5105 d < conf->raid_disks - conf->max_degraded;
5106 d++)
5107 bitmap_startwrite(mddev->bitmap,
5108 sh->sector,
5109 STRIPE_SECTORS,
5110 0);
5111 sh->bm_seq = conf->seq_flush + 1;
5112 set_bit(STRIPE_BIT_DELAY, &sh->state);
5113 }
5114
5115 set_bit(STRIPE_HANDLE, &sh->state);
5116 clear_bit(STRIPE_DELAYED, &sh->state);
5117 if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
5118 atomic_inc(&conf->preread_active_stripes);
5119 release_stripe_plug(mddev, sh);
5120 }
5121
5122 remaining = raid5_dec_bi_active_stripes(bi);
5123 if (remaining == 0) {
5124 md_write_end(mddev);
5125 bio_endio(bi, 0);
5126 }
5127}
5128
5129static void make_request(struct mddev *mddev, struct bio * bi)
5130{
5131 struct r5conf *conf = mddev->private;
5132 int dd_idx;
5133 sector_t new_sector;
5134 sector_t logical_sector, last_sector;
5135 struct stripe_head *sh;
5136 const int rw = bio_data_dir(bi);
5137 int remaining;
5138 DEFINE_WAIT(w);
5139 bool do_prepare;
5140
5141 if (unlikely(bi->bi_rw & REQ_FLUSH)) {
5142 md_flush_request(mddev, bi);
5143 return;
5144 }
5145
5146 md_write_start(mddev, bi);
5147
5148
5149
5150
5151
5152
5153 if (rw == READ && mddev->degraded == 0 &&
5154 mddev->reshape_position == MaxSector &&
5155 chunk_aligned_read(mddev,bi))
5156 return;
5157
5158 if (unlikely(bi->bi_rw & REQ_DISCARD)) {
5159 make_discard_request(mddev, bi);
5160 return;
5161 }
5162
5163 logical_sector = bi->bi_iter.bi_sector & ~((sector_t)STRIPE_SECTORS-1);
5164 last_sector = bio_end_sector(bi);
5165 bi->bi_next = NULL;
5166 bi->bi_phys_segments = 1;
5167
5168 prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE);
5169 for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) {
5170 int previous;
5171 int seq;
5172
5173 do_prepare = false;
5174 retry:
5175 seq = read_seqcount_begin(&conf->gen_lock);
5176 previous = 0;
5177 if (do_prepare)
5178 prepare_to_wait(&conf->wait_for_overlap, &w,
5179 TASK_UNINTERRUPTIBLE);
5180 if (unlikely(conf->reshape_progress != MaxSector)) {
5181
5182
5183
5184
5185
5186
5187
5188
5189 spin_lock_irq(&conf->device_lock);
5190 if (mddev->reshape_backwards
5191 ? logical_sector < conf->reshape_progress
5192 : logical_sector >= conf->reshape_progress) {
5193 previous = 1;
5194 } else {
5195 if (mddev->reshape_backwards
5196 ? logical_sector < conf->reshape_safe
5197 : logical_sector >= conf->reshape_safe) {
5198 spin_unlock_irq(&conf->device_lock);
5199 schedule();
5200 do_prepare = true;
5201 goto retry;
5202 }
5203 }
5204 spin_unlock_irq(&conf->device_lock);
5205 }
5206
5207 new_sector = raid5_compute_sector(conf, logical_sector,
5208 previous,
5209 &dd_idx, NULL);
5210 pr_debug("raid456: make_request, sector %llu logical %llu\n",
5211 (unsigned long long)new_sector,
5212 (unsigned long long)logical_sector);
5213
5214 sh = get_active_stripe(conf, new_sector, previous,
5215 (bi->bi_rw&RWA_MASK), 0);
5216 if (sh) {
5217 if (unlikely(previous)) {
5218
5219
5220
5221
5222
5223
5224
5225
5226 int must_retry = 0;
5227 spin_lock_irq(&conf->device_lock);
5228 if (mddev->reshape_backwards
5229 ? logical_sector >= conf->reshape_progress
5230 : logical_sector < conf->reshape_progress)
5231
5232 must_retry = 1;
5233 spin_unlock_irq(&conf->device_lock);
5234 if (must_retry) {
5235 release_stripe(sh);
5236 schedule();
5237 do_prepare = true;
5238 goto retry;
5239 }
5240 }
5241 if (read_seqcount_retry(&conf->gen_lock, seq)) {
5242
5243
5244
5245 release_stripe(sh);
5246 goto retry;
5247 }
5248
5249 if (rw == WRITE &&
5250 logical_sector >= mddev->suspend_lo &&
5251 logical_sector < mddev->suspend_hi) {
5252 release_stripe(sh);
5253
5254
5255
5256
5257 flush_signals(current);
5258 prepare_to_wait(&conf->wait_for_overlap,
5259 &w, TASK_INTERRUPTIBLE);
5260 if (logical_sector >= mddev->suspend_lo &&
5261 logical_sector < mddev->suspend_hi) {
5262 schedule();
5263 do_prepare = true;
5264 }
5265 goto retry;
5266 }
5267
5268 if (test_bit(STRIPE_EXPANDING, &sh->state) ||
5269 !add_stripe_bio(sh, bi, dd_idx, rw, previous)) {
5270
5271
5272
5273
5274 md_wakeup_thread(mddev->thread);
5275 release_stripe(sh);
5276 schedule();
5277 do_prepare = true;
5278 goto retry;
5279 }
5280 set_bit(STRIPE_HANDLE, &sh->state);
5281 clear_bit(STRIPE_DELAYED, &sh->state);
5282 if ((!sh->batch_head || sh == sh->batch_head) &&
5283 (bi->bi_rw & REQ_SYNC) &&
5284 !test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
5285 atomic_inc(&conf->preread_active_stripes);
5286 release_stripe_plug(mddev, sh);
5287 } else {
5288
5289 clear_bit(BIO_UPTODATE, &bi->bi_flags);
5290 break;
5291 }
5292 }
5293 finish_wait(&conf->wait_for_overlap, &w);
5294
5295 remaining = raid5_dec_bi_active_stripes(bi);
5296 if (remaining == 0) {
5297
5298 if ( rw == WRITE )
5299 md_write_end(mddev);
5300
5301 trace_block_bio_complete(bdev_get_queue(bi->bi_bdev),
5302 bi, 0);
5303 bio_endio(bi, 0);
5304 }
5305}
5306
5307static sector_t raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks);
5308
5309static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *skipped)
5310{
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320 struct r5conf *conf = mddev->private;
5321 struct stripe_head *sh;
5322 sector_t first_sector, last_sector;
5323 int raid_disks = conf->previous_raid_disks;
5324 int data_disks = raid_disks - conf->max_degraded;
5325 int new_data_disks = conf->raid_disks - conf->max_degraded;
5326 int i;
5327 int dd_idx;
5328 sector_t writepos, readpos, safepos;
5329 sector_t stripe_addr;
5330 int reshape_sectors;
5331 struct list_head stripes;
5332
5333 if (sector_nr == 0) {
5334
5335 if (mddev->reshape_backwards &&
5336 conf->reshape_progress < raid5_size(mddev, 0, 0)) {
5337 sector_nr = raid5_size(mddev, 0, 0)
5338 - conf->reshape_progress;
5339 } else if (!mddev->reshape_backwards &&
5340 conf->reshape_progress > 0)
5341 sector_nr = conf->reshape_progress;
5342 sector_div(sector_nr, new_data_disks);
5343 if (sector_nr) {
5344 mddev->curr_resync_completed = sector_nr;
5345 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5346 *skipped = 1;
5347 return sector_nr;
5348 }
5349 }
5350
5351
5352
5353
5354
5355 if (mddev->new_chunk_sectors > mddev->chunk_sectors)
5356 reshape_sectors = mddev->new_chunk_sectors;
5357 else
5358 reshape_sectors = mddev->chunk_sectors;
5359
5360
5361
5362
5363
5364
5365
5366 writepos = conf->reshape_progress;
5367 sector_div(writepos, new_data_disks);
5368 readpos = conf->reshape_progress;
5369 sector_div(readpos, data_disks);
5370 safepos = conf->reshape_safe;
5371 sector_div(safepos, data_disks);
5372 if (mddev->reshape_backwards) {
5373 writepos -= min_t(sector_t, reshape_sectors, writepos);
5374 readpos += reshape_sectors;
5375 safepos += reshape_sectors;
5376 } else {
5377 writepos += reshape_sectors;
5378 readpos -= min_t(sector_t, reshape_sectors, readpos);
5379 safepos -= min_t(sector_t, reshape_sectors, safepos);
5380 }
5381
5382
5383
5384
5385 if (mddev->reshape_backwards) {
5386 BUG_ON(conf->reshape_progress == 0);
5387 stripe_addr = writepos;
5388 BUG_ON((mddev->dev_sectors &
5389 ~((sector_t)reshape_sectors - 1))
5390 - reshape_sectors - stripe_addr
5391 != sector_nr);
5392 } else {
5393 BUG_ON(writepos != sector_nr + reshape_sectors);
5394 stripe_addr = sector_nr;
5395 }
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417 if (conf->min_offset_diff < 0) {
5418 safepos += -conf->min_offset_diff;
5419 readpos += -conf->min_offset_diff;
5420 } else
5421 writepos += conf->min_offset_diff;
5422
5423 if ((mddev->reshape_backwards
5424 ? (safepos > writepos && readpos < writepos)
5425 : (safepos < writepos && readpos > writepos)) ||
5426 time_after(jiffies, conf->reshape_checkpoint + 10*HZ)) {
5427
5428 wait_event(conf->wait_for_overlap,
5429 atomic_read(&conf->reshape_stripes)==0
5430 || test_bit(MD_RECOVERY_INTR, &mddev->recovery));
5431 if (atomic_read(&conf->reshape_stripes) != 0)
5432 return 0;
5433 mddev->reshape_position = conf->reshape_progress;
5434 mddev->curr_resync_completed = sector_nr;
5435 conf->reshape_checkpoint = jiffies;
5436 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5437 md_wakeup_thread(mddev->thread);
5438 wait_event(mddev->sb_wait, mddev->flags == 0 ||
5439 test_bit(MD_RECOVERY_INTR, &mddev->recovery));
5440 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5441 return 0;
5442 spin_lock_irq(&conf->device_lock);
5443 conf->reshape_safe = mddev->reshape_position;
5444 spin_unlock_irq(&conf->device_lock);
5445 wake_up(&conf->wait_for_overlap);
5446 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5447 }
5448
5449 INIT_LIST_HEAD(&stripes);
5450 for (i = 0; i < reshape_sectors; i += STRIPE_SECTORS) {
5451 int j;
5452 int skipped_disk = 0;
5453 sh = get_active_stripe(conf, stripe_addr+i, 0, 0, 1);
5454 set_bit(STRIPE_EXPANDING, &sh->state);
5455 atomic_inc(&conf->reshape_stripes);
5456
5457
5458
5459 for (j=sh->disks; j--;) {
5460 sector_t s;
5461 if (j == sh->pd_idx)
5462 continue;
5463 if (conf->level == 6 &&
5464 j == sh->qd_idx)
5465 continue;
5466 s = compute_blocknr(sh, j, 0);
5467 if (s < raid5_size(mddev, 0, 0)) {
5468 skipped_disk = 1;
5469 continue;
5470 }
5471 memset(page_address(sh->dev[j].page), 0, STRIPE_SIZE);
5472 set_bit(R5_Expanded, &sh->dev[j].flags);
5473 set_bit(R5_UPTODATE, &sh->dev[j].flags);
5474 }
5475 if (!skipped_disk) {
5476 set_bit(STRIPE_EXPAND_READY, &sh->state);
5477 set_bit(STRIPE_HANDLE, &sh->state);
5478 }
5479 list_add(&sh->lru, &stripes);
5480 }
5481 spin_lock_irq(&conf->device_lock);
5482 if (mddev->reshape_backwards)
5483 conf->reshape_progress -= reshape_sectors * new_data_disks;
5484 else
5485 conf->reshape_progress += reshape_sectors * new_data_disks;
5486 spin_unlock_irq(&conf->device_lock);
5487
5488
5489
5490
5491
5492 first_sector =
5493 raid5_compute_sector(conf, stripe_addr*(new_data_disks),
5494 1, &dd_idx, NULL);
5495 last_sector =
5496 raid5_compute_sector(conf, ((stripe_addr+reshape_sectors)
5497 * new_data_disks - 1),
5498 1, &dd_idx, NULL);
5499 if (last_sector >= mddev->dev_sectors)
5500 last_sector = mddev->dev_sectors - 1;
5501 while (first_sector <= last_sector) {
5502 sh = get_active_stripe(conf, first_sector, 1, 0, 1);
5503 set_bit(STRIPE_EXPAND_SOURCE, &sh->state);
5504 set_bit(STRIPE_HANDLE, &sh->state);
5505 release_stripe(sh);
5506 first_sector += STRIPE_SECTORS;
5507 }
5508
5509
5510
5511 while (!list_empty(&stripes)) {
5512 sh = list_entry(stripes.next, struct stripe_head, lru);
5513 list_del_init(&sh->lru);
5514 release_stripe(sh);
5515 }
5516
5517
5518
5519 sector_nr += reshape_sectors;
5520 if ((sector_nr - mddev->curr_resync_completed) * 2
5521 >= mddev->resync_max - mddev->curr_resync_completed) {
5522
5523 wait_event(conf->wait_for_overlap,
5524 atomic_read(&conf->reshape_stripes) == 0
5525 || test_bit(MD_RECOVERY_INTR, &mddev->recovery));
5526 if (atomic_read(&conf->reshape_stripes) != 0)
5527 goto ret;
5528 mddev->reshape_position = conf->reshape_progress;
5529 mddev->curr_resync_completed = sector_nr;
5530 conf->reshape_checkpoint = jiffies;
5531 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5532 md_wakeup_thread(mddev->thread);
5533 wait_event(mddev->sb_wait,
5534 !test_bit(MD_CHANGE_DEVS, &mddev->flags)
5535 || test_bit(MD_RECOVERY_INTR, &mddev->recovery));
5536 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5537 goto ret;
5538 spin_lock_irq(&conf->device_lock);
5539 conf->reshape_safe = mddev->reshape_position;
5540 spin_unlock_irq(&conf->device_lock);
5541 wake_up(&conf->wait_for_overlap);
5542 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5543 }
5544ret:
5545 return reshape_sectors;
5546}
5547
5548static inline sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipped)
5549{
5550 struct r5conf *conf = mddev->private;
5551 struct stripe_head *sh;
5552 sector_t max_sector = mddev->dev_sectors;
5553 sector_t sync_blocks;
5554 int still_degraded = 0;
5555 int i;
5556
5557 if (sector_nr >= max_sector) {
5558
5559
5560 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
5561 end_reshape(conf);
5562 return 0;
5563 }
5564
5565 if (mddev->curr_resync < max_sector)
5566 bitmap_end_sync(mddev->bitmap, mddev->curr_resync,
5567 &sync_blocks, 1);
5568 else
5569 conf->fullsync = 0;
5570 bitmap_close_sync(mddev->bitmap);
5571
5572 return 0;
5573 }
5574
5575
5576 wait_event(conf->wait_for_overlap, conf->quiesce != 2);
5577
5578 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5579 return reshape_request(mddev, sector_nr, skipped);
5580
5581
5582
5583
5584
5585
5586
5587
5588
5589
5590
5591 if (mddev->degraded >= conf->max_degraded &&
5592 test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5593 sector_t rv = mddev->dev_sectors - sector_nr;
5594 *skipped = 1;
5595 return rv;
5596 }
5597 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
5598 !conf->fullsync &&
5599 !bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) &&
5600 sync_blocks >= STRIPE_SECTORS) {
5601
5602 sync_blocks /= STRIPE_SECTORS;
5603 *skipped = 1;
5604 return sync_blocks * STRIPE_SECTORS;
5605 }
5606
5607 bitmap_cond_end_sync(mddev->bitmap, sector_nr);
5608
5609 sh = get_active_stripe(conf, sector_nr, 0, 1, 0);
5610 if (sh == NULL) {
5611 sh = get_active_stripe(conf, sector_nr, 0, 0, 0);
5612
5613
5614
5615 schedule_timeout_uninterruptible(1);
5616 }
5617
5618
5619
5620
5621 rcu_read_lock();
5622 for (i = 0; i < conf->raid_disks; i++) {
5623 struct md_rdev *rdev = ACCESS_ONCE(conf->disks[i].rdev);
5624
5625 if (rdev == NULL || test_bit(Faulty, &rdev->flags))
5626 still_degraded = 1;
5627 }
5628 rcu_read_unlock();
5629
5630 bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded);
5631
5632 set_bit(STRIPE_SYNC_REQUESTED, &sh->state);
5633 set_bit(STRIPE_HANDLE, &sh->state);
5634
5635 release_stripe(sh);
5636
5637 return STRIPE_SECTORS;
5638}
5639
5640static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio)
5641{
5642
5643
5644
5645
5646
5647
5648
5649
5650
5651
5652 struct stripe_head *sh;
5653 int dd_idx;
5654 sector_t sector, logical_sector, last_sector;
5655 int scnt = 0;
5656 int remaining;
5657 int handled = 0;
5658
5659 logical_sector = raid_bio->bi_iter.bi_sector &
5660 ~((sector_t)STRIPE_SECTORS-1);
5661 sector = raid5_compute_sector(conf, logical_sector,
5662 0, &dd_idx, NULL);
5663 last_sector = bio_end_sector(raid_bio);
5664
5665 for (; logical_sector < last_sector;
5666 logical_sector += STRIPE_SECTORS,
5667 sector += STRIPE_SECTORS,
5668 scnt++) {
5669
5670 if (scnt < raid5_bi_processed_stripes(raid_bio))
5671
5672 continue;
5673
5674 sh = get_active_stripe(conf, sector, 0, 1, 1);
5675
5676 if (!sh) {
5677
5678 raid5_set_bi_processed_stripes(raid_bio, scnt);
5679 conf->retry_read_aligned = raid_bio;
5680 return handled;
5681 }
5682
5683 if (!add_stripe_bio(sh, raid_bio, dd_idx, 0, 0)) {
5684 release_stripe(sh);
5685 raid5_set_bi_processed_stripes(raid_bio, scnt);
5686 conf->retry_read_aligned = raid_bio;
5687 return handled;
5688 }
5689
5690 set_bit(R5_ReadNoMerge, &sh->dev[dd_idx].flags);
5691 handle_stripe(sh);
5692 release_stripe(sh);
5693 handled++;
5694 }
5695 remaining = raid5_dec_bi_active_stripes(raid_bio);
5696 if (remaining == 0) {
5697 trace_block_bio_complete(bdev_get_queue(raid_bio->bi_bdev),
5698 raid_bio, 0);
5699 bio_endio(raid_bio, 0);
5700 }
5701 if (atomic_dec_and_test(&conf->active_aligned_reads))
5702 wake_up(&conf->wait_for_stripe);
5703 return handled;
5704}
5705
5706static int handle_active_stripes(struct r5conf *conf, int group,
5707 struct r5worker *worker,
5708 struct list_head *temp_inactive_list)
5709{
5710 struct stripe_head *batch[MAX_STRIPE_BATCH], *sh;
5711 int i, batch_size = 0, hash;
5712 bool release_inactive = false;
5713
5714 while (batch_size < MAX_STRIPE_BATCH &&
5715 (sh = __get_priority_stripe(conf, group)) != NULL)
5716 batch[batch_size++] = sh;
5717
5718 if (batch_size == 0) {
5719 for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++)
5720 if (!list_empty(temp_inactive_list + i))
5721 break;
5722 if (i == NR_STRIPE_HASH_LOCKS)
5723 return batch_size;
5724 release_inactive = true;
5725 }
5726 spin_unlock_irq(&conf->device_lock);
5727
5728 release_inactive_stripe_list(conf, temp_inactive_list,
5729 NR_STRIPE_HASH_LOCKS);
5730
5731 if (release_inactive) {
5732 spin_lock_irq(&conf->device_lock);
5733 return 0;
5734 }
5735
5736 for (i = 0; i < batch_size; i++)
5737 handle_stripe(batch[i]);
5738
5739 cond_resched();
5740
5741 spin_lock_irq(&conf->device_lock);
5742 for (i = 0; i < batch_size; i++) {
5743 hash = batch[i]->hash_lock_index;
5744 __release_stripe(conf, batch[i], &temp_inactive_list[hash]);
5745 }
5746 return batch_size;
5747}
5748
5749static void raid5_do_work(struct work_struct *work)
5750{
5751 struct r5worker *worker = container_of(work, struct r5worker, work);
5752 struct r5worker_group *group = worker->group;
5753 struct r5conf *conf = group->conf;
5754 int group_id = group - conf->worker_groups;
5755 int handled;
5756 struct blk_plug plug;
5757
5758 pr_debug("+++ raid5worker active\n");
5759
5760 blk_start_plug(&plug);
5761 handled = 0;
5762 spin_lock_irq(&conf->device_lock);
5763 while (1) {
5764 int batch_size, released;
5765
5766 released = release_stripe_list(conf, worker->temp_inactive_list);
5767
5768 batch_size = handle_active_stripes(conf, group_id, worker,
5769 worker->temp_inactive_list);
5770 worker->working = false;
5771 if (!batch_size && !released)
5772 break;
5773 handled += batch_size;
5774 }
5775 pr_debug("%d stripes handled\n", handled);
5776
5777 spin_unlock_irq(&conf->device_lock);
5778 blk_finish_plug(&plug);
5779
5780 pr_debug("--- raid5worker inactive\n");
5781}
5782
5783
5784
5785
5786
5787
5788
5789
5790static void raid5d(struct md_thread *thread)
5791{
5792 struct mddev *mddev = thread->mddev;
5793 struct r5conf *conf = mddev->private;
5794 int handled;
5795 struct blk_plug plug;
5796
5797 pr_debug("+++ raid5d active\n");
5798
5799 md_check_recovery(mddev);
5800
5801 blk_start_plug(&plug);
5802 handled = 0;
5803 spin_lock_irq(&conf->device_lock);
5804 while (1) {
5805 struct bio *bio;
5806 int batch_size, released;
5807
5808 released = release_stripe_list(conf, conf->temp_inactive_list);
5809 if (released)
5810 clear_bit(R5_DID_ALLOC, &conf->cache_state);
5811
5812 if (
5813 !list_empty(&conf->bitmap_list)) {
5814
5815 conf->seq_flush++;
5816 spin_unlock_irq(&conf->device_lock);
5817 bitmap_unplug(mddev->bitmap);
5818 spin_lock_irq(&conf->device_lock);
5819 conf->seq_write = conf->seq_flush;
5820 activate_bit_delay(conf, conf->temp_inactive_list);
5821 }
5822 raid5_activate_delayed(conf);
5823
5824 while ((bio = remove_bio_from_retry(conf))) {
5825 int ok;
5826 spin_unlock_irq(&conf->device_lock);
5827 ok = retry_aligned_read(conf, bio);
5828 spin_lock_irq(&conf->device_lock);
5829 if (!ok)
5830 break;
5831 handled++;
5832 }
5833
5834 batch_size = handle_active_stripes(conf, ANY_GROUP, NULL,
5835 conf->temp_inactive_list);
5836 if (!batch_size && !released)
5837 break;
5838 handled += batch_size;
5839
5840 if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) {
5841 spin_unlock_irq(&conf->device_lock);
5842 md_check_recovery(mddev);
5843 spin_lock_irq(&conf->device_lock);
5844 }
5845 }
5846 pr_debug("%d stripes handled\n", handled);
5847
5848 spin_unlock_irq(&conf->device_lock);
5849 if (test_and_clear_bit(R5_ALLOC_MORE, &conf->cache_state)) {
5850 grow_one_stripe(conf, __GFP_NOWARN);
5851
5852
5853
5854 set_bit(R5_DID_ALLOC, &conf->cache_state);
5855 }
5856
5857 async_tx_issue_pending_all();
5858 blk_finish_plug(&plug);
5859
5860 pr_debug("--- raid5d inactive\n");
5861}
5862
5863static ssize_t
5864raid5_show_stripe_cache_size(struct mddev *mddev, char *page)
5865{
5866 struct r5conf *conf;
5867 int ret = 0;
5868 spin_lock(&mddev->lock);
5869 conf = mddev->private;
5870 if (conf)
5871 ret = sprintf(page, "%d\n", conf->min_nr_stripes);
5872 spin_unlock(&mddev->lock);
5873 return ret;
5874}
5875
5876int
5877raid5_set_cache_size(struct mddev *mddev, int size)
5878{
5879 struct r5conf *conf = mddev->private;
5880 int err;
5881
5882 if (size <= 16 || size > 32768)
5883 return -EINVAL;
5884
5885 conf->min_nr_stripes = size;
5886 while (size < conf->max_nr_stripes &&
5887 drop_one_stripe(conf))
5888 ;
5889
5890
5891 err = md_allow_write(mddev);
5892 if (err)
5893 return err;
5894
5895 while (size > conf->max_nr_stripes)
5896 if (!grow_one_stripe(conf, GFP_KERNEL))
5897 break;
5898
5899 return 0;
5900}
5901EXPORT_SYMBOL(raid5_set_cache_size);
5902
5903static ssize_t
5904raid5_store_stripe_cache_size(struct mddev *mddev, const char *page, size_t len)
5905{
5906 struct r5conf *conf;
5907 unsigned long new;
5908 int err;
5909
5910 if (len >= PAGE_SIZE)
5911 return -EINVAL;
5912 if (kstrtoul(page, 10, &new))
5913 return -EINVAL;
5914 err = mddev_lock(mddev);
5915 if (err)
5916 return err;
5917 conf = mddev->private;
5918 if (!conf)
5919 err = -ENODEV;
5920 else
5921 err = raid5_set_cache_size(mddev, new);
5922 mddev_unlock(mddev);
5923
5924 return err ?: len;
5925}
5926
5927static struct md_sysfs_entry
5928raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR,
5929 raid5_show_stripe_cache_size,
5930 raid5_store_stripe_cache_size);
5931
5932static ssize_t
5933raid5_show_rmw_level(struct mddev *mddev, char *page)
5934{
5935 struct r5conf *conf = mddev->private;
5936 if (conf)
5937 return sprintf(page, "%d\n", conf->rmw_level);
5938 else
5939 return 0;
5940}
5941
5942static ssize_t
5943raid5_store_rmw_level(struct mddev *mddev, const char *page, size_t len)
5944{
5945 struct r5conf *conf = mddev->private;
5946 unsigned long new;
5947
5948 if (!conf)
5949 return -ENODEV;
5950
5951 if (len >= PAGE_SIZE)
5952 return -EINVAL;
5953
5954 if (kstrtoul(page, 10, &new))
5955 return -EINVAL;
5956
5957 if (new != PARITY_DISABLE_RMW && !raid6_call.xor_syndrome)
5958 return -EINVAL;
5959
5960 if (new != PARITY_DISABLE_RMW &&
5961 new != PARITY_ENABLE_RMW &&
5962 new != PARITY_PREFER_RMW)
5963 return -EINVAL;
5964
5965 conf->rmw_level = new;
5966 return len;
5967}
5968
5969static struct md_sysfs_entry
5970raid5_rmw_level = __ATTR(rmw_level, S_IRUGO | S_IWUSR,
5971 raid5_show_rmw_level,
5972 raid5_store_rmw_level);
5973
5974
5975static ssize_t
5976raid5_show_preread_threshold(struct mddev *mddev, char *page)
5977{
5978 struct r5conf *conf;
5979 int ret = 0;
5980 spin_lock(&mddev->lock);
5981 conf = mddev->private;
5982 if (conf)
5983 ret = sprintf(page, "%d\n", conf->bypass_threshold);
5984 spin_unlock(&mddev->lock);
5985 return ret;
5986}
5987
5988static ssize_t
5989raid5_store_preread_threshold(struct mddev *mddev, const char *page, size_t len)
5990{
5991 struct r5conf *conf;
5992 unsigned long new;
5993 int err;
5994
5995 if (len >= PAGE_SIZE)
5996 return -EINVAL;
5997 if (kstrtoul(page, 10, &new))
5998 return -EINVAL;
5999
6000 err = mddev_lock(mddev);
6001 if (err)
6002 return err;
6003 conf = mddev->private;
6004 if (!conf)
6005 err = -ENODEV;
6006 else if (new > conf->min_nr_stripes)
6007 err = -EINVAL;
6008 else
6009 conf->bypass_threshold = new;
6010 mddev_unlock(mddev);
6011 return err ?: len;
6012}
6013
6014static struct md_sysfs_entry
6015raid5_preread_bypass_threshold = __ATTR(preread_bypass_threshold,
6016 S_IRUGO | S_IWUSR,
6017 raid5_show_preread_threshold,
6018 raid5_store_preread_threshold);
6019
6020static ssize_t
6021raid5_show_skip_copy(struct mddev *mddev, char *page)
6022{
6023 struct r5conf *conf;
6024 int ret = 0;
6025 spin_lock(&mddev->lock);
6026 conf = mddev->private;
6027 if (conf)
6028 ret = sprintf(page, "%d\n", conf->skip_copy);
6029 spin_unlock(&mddev->lock);
6030 return ret;
6031}
6032
6033static ssize_t
6034raid5_store_skip_copy(struct mddev *mddev, const char *page, size_t len)
6035{
6036 struct r5conf *conf;
6037 unsigned long new;
6038 int err;
6039
6040 if (len >= PAGE_SIZE)
6041 return -EINVAL;
6042 if (kstrtoul(page, 10, &new))
6043 return -EINVAL;
6044 new = !!new;
6045
6046 err = mddev_lock(mddev);
6047 if (err)
6048 return err;
6049 conf = mddev->private;
6050 if (!conf)
6051 err = -ENODEV;
6052 else if (new != conf->skip_copy) {
6053 mddev_suspend(mddev);
6054 conf->skip_copy = new;
6055 if (new)
6056 mddev->queue->backing_dev_info.capabilities |=
6057 BDI_CAP_STABLE_WRITES;
6058 else
6059 mddev->queue->backing_dev_info.capabilities &=
6060 ~BDI_CAP_STABLE_WRITES;
6061 mddev_resume(mddev);
6062 }
6063 mddev_unlock(mddev);
6064 return err ?: len;
6065}
6066
6067static struct md_sysfs_entry
6068raid5_skip_copy = __ATTR(skip_copy, S_IRUGO | S_IWUSR,
6069 raid5_show_skip_copy,
6070 raid5_store_skip_copy);
6071
6072static ssize_t
6073stripe_cache_active_show(struct mddev *mddev, char *page)
6074{
6075 struct r5conf *conf = mddev->private;
6076 if (conf)
6077 return sprintf(page, "%d\n", atomic_read(&conf->active_stripes));
6078 else
6079 return 0;
6080}
6081
6082static struct md_sysfs_entry
6083raid5_stripecache_active = __ATTR_RO(stripe_cache_active);
6084
6085static ssize_t
6086raid5_show_group_thread_cnt(struct mddev *mddev, char *page)
6087{
6088 struct r5conf *conf;
6089 int ret = 0;
6090 spin_lock(&mddev->lock);
6091 conf = mddev->private;
6092 if (conf)
6093 ret = sprintf(page, "%d\n", conf->worker_cnt_per_group);
6094 spin_unlock(&mddev->lock);
6095 return ret;
6096}
6097
6098static int alloc_thread_groups(struct r5conf *conf, int cnt,
6099 int *group_cnt,
6100 int *worker_cnt_per_group,
6101 struct r5worker_group **worker_groups);
6102static ssize_t
6103raid5_store_group_thread_cnt(struct mddev *mddev, const char *page, size_t len)
6104{
6105 struct r5conf *conf;
6106 unsigned long new;
6107 int err;
6108 struct r5worker_group *new_groups, *old_groups;
6109 int group_cnt, worker_cnt_per_group;
6110
6111 if (len >= PAGE_SIZE)
6112 return -EINVAL;
6113 if (kstrtoul(page, 10, &new))
6114 return -EINVAL;
6115
6116 err = mddev_lock(mddev);
6117 if (err)
6118 return err;
6119 conf = mddev->private;
6120 if (!conf)
6121 err = -ENODEV;
6122 else if (new != conf->worker_cnt_per_group) {
6123 mddev_suspend(mddev);
6124
6125 old_groups = conf->worker_groups;
6126 if (old_groups)
6127 flush_workqueue(raid5_wq);
6128
6129 err = alloc_thread_groups(conf, new,
6130 &group_cnt, &worker_cnt_per_group,
6131 &new_groups);
6132 if (!err) {
6133 spin_lock_irq(&conf->device_lock);
6134 conf->group_cnt = group_cnt;
6135 conf->worker_cnt_per_group = worker_cnt_per_group;
6136 conf->worker_groups = new_groups;
6137 spin_unlock_irq(&conf->device_lock);
6138
6139 if (old_groups)
6140 kfree(old_groups[0].workers);
6141 kfree(old_groups);
6142 }
6143 mddev_resume(mddev);
6144 }
6145 mddev_unlock(mddev);
6146
6147 return err ?: len;
6148}
6149
6150static struct md_sysfs_entry
6151raid5_group_thread_cnt = __ATTR(group_thread_cnt, S_IRUGO | S_IWUSR,
6152 raid5_show_group_thread_cnt,
6153 raid5_store_group_thread_cnt);
6154
6155static struct attribute *raid5_attrs[] = {
6156 &raid5_stripecache_size.attr,
6157 &raid5_stripecache_active.attr,
6158 &raid5_preread_bypass_threshold.attr,
6159 &raid5_group_thread_cnt.attr,
6160 &raid5_skip_copy.attr,
6161 &raid5_rmw_level.attr,
6162 NULL,
6163};
6164static struct attribute_group raid5_attrs_group = {
6165 .name = NULL,
6166 .attrs = raid5_attrs,
6167};
6168
6169static int alloc_thread_groups(struct r5conf *conf, int cnt,
6170 int *group_cnt,
6171 int *worker_cnt_per_group,
6172 struct r5worker_group **worker_groups)
6173{
6174 int i, j, k;
6175 ssize_t size;
6176 struct r5worker *workers;
6177
6178 *worker_cnt_per_group = cnt;
6179 if (cnt == 0) {
6180 *group_cnt = 0;
6181 *worker_groups = NULL;
6182 return 0;
6183 }
6184 *group_cnt = num_possible_nodes();
6185 size = sizeof(struct r5worker) * cnt;
6186 workers = kzalloc(size * *group_cnt, GFP_NOIO);
6187 *worker_groups = kzalloc(sizeof(struct r5worker_group) *
6188 *group_cnt, GFP_NOIO);
6189 if (!*worker_groups || !workers) {
6190 kfree(workers);
6191 kfree(*worker_groups);
6192 return -ENOMEM;
6193 }
6194
6195 for (i = 0; i < *group_cnt; i++) {
6196 struct r5worker_group *group;
6197
6198 group = &(*worker_groups)[i];
6199 INIT_LIST_HEAD(&group->handle_list);
6200 group->conf = conf;
6201 group->workers = workers + i * cnt;
6202
6203 for (j = 0; j < cnt; j++) {
6204 struct r5worker *worker = group->workers + j;
6205 worker->group = group;
6206 INIT_WORK(&worker->work, raid5_do_work);
6207
6208 for (k = 0; k < NR_STRIPE_HASH_LOCKS; k++)
6209 INIT_LIST_HEAD(worker->temp_inactive_list + k);
6210 }
6211 }
6212
6213 return 0;
6214}
6215
6216static void free_thread_groups(struct r5conf *conf)
6217{
6218 if (conf->worker_groups)
6219 kfree(conf->worker_groups[0].workers);
6220 kfree(conf->worker_groups);
6221 conf->worker_groups = NULL;
6222}
6223
6224static sector_t
6225raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks)
6226{
6227 struct r5conf *conf = mddev->private;
6228
6229 if (!sectors)
6230 sectors = mddev->dev_sectors;
6231 if (!raid_disks)
6232
6233 raid_disks = min(conf->raid_disks, conf->previous_raid_disks);
6234
6235 sectors &= ~((sector_t)mddev->chunk_sectors - 1);
6236 sectors &= ~((sector_t)mddev->new_chunk_sectors - 1);
6237 return sectors * (raid_disks - conf->max_degraded);
6238}
6239
6240static void free_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu)
6241{
6242 safe_put_page(percpu->spare_page);
6243 if (percpu->scribble)
6244 flex_array_free(percpu->scribble);
6245 percpu->spare_page = NULL;
6246 percpu->scribble = NULL;
6247}
6248
6249static int alloc_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu)
6250{
6251 if (conf->level == 6 && !percpu->spare_page)
6252 percpu->spare_page = alloc_page(GFP_KERNEL);
6253 if (!percpu->scribble)
6254 percpu->scribble = scribble_alloc(max(conf->raid_disks,
6255 conf->previous_raid_disks),
6256 max(conf->chunk_sectors,
6257 conf->prev_chunk_sectors)
6258 / STRIPE_SECTORS,
6259 GFP_KERNEL);
6260
6261 if (!percpu->scribble || (conf->level == 6 && !percpu->spare_page)) {
6262 free_scratch_buffer(conf, percpu);
6263 return -ENOMEM;
6264 }
6265
6266 return 0;
6267}
6268
6269static void raid5_free_percpu(struct r5conf *conf)
6270{
6271 unsigned long cpu;
6272
6273 if (!conf->percpu)
6274 return;
6275
6276#ifdef CONFIG_HOTPLUG_CPU
6277 unregister_cpu_notifier(&conf->cpu_notify);
6278#endif
6279
6280 get_online_cpus();
6281 for_each_possible_cpu(cpu)
6282 free_scratch_buffer(conf, per_cpu_ptr(conf->percpu, cpu));
6283 put_online_cpus();
6284
6285 free_percpu(conf->percpu);
6286}
6287
6288static void free_conf(struct r5conf *conf)
6289{
6290 if (conf->shrinker.seeks)
6291 unregister_shrinker(&conf->shrinker);
6292 free_thread_groups(conf);
6293 shrink_stripes(conf);
6294 raid5_free_percpu(conf);
6295 kfree(conf->disks);
6296 kfree(conf->stripe_hashtbl);
6297 kfree(conf);
6298}
6299
6300#ifdef CONFIG_HOTPLUG_CPU
6301static int raid456_cpu_notify(struct notifier_block *nfb, unsigned long action,
6302 void *hcpu)
6303{
6304 struct r5conf *conf = container_of(nfb, struct r5conf, cpu_notify);
6305 long cpu = (long)hcpu;
6306 struct raid5_percpu *percpu = per_cpu_ptr(conf->percpu, cpu);
6307
6308 switch (action) {
6309 case CPU_UP_PREPARE:
6310 case CPU_UP_PREPARE_FROZEN:
6311 if (alloc_scratch_buffer(conf, percpu)) {
6312 pr_err("%s: failed memory allocation for cpu%ld\n",
6313 __func__, cpu);
6314 return notifier_from_errno(-ENOMEM);
6315 }
6316 break;
6317 case CPU_DEAD:
6318 case CPU_DEAD_FROZEN:
6319 free_scratch_buffer(conf, per_cpu_ptr(conf->percpu, cpu));
6320 break;
6321 default:
6322 break;
6323 }
6324 return NOTIFY_OK;
6325}
6326#endif
6327
6328static int raid5_alloc_percpu(struct r5conf *conf)
6329{
6330 unsigned long cpu;
6331 int err = 0;
6332
6333 conf->percpu = alloc_percpu(struct raid5_percpu);
6334 if (!conf->percpu)
6335 return -ENOMEM;
6336
6337#ifdef CONFIG_HOTPLUG_CPU
6338 conf->cpu_notify.notifier_call = raid456_cpu_notify;
6339 conf->cpu_notify.priority = 0;
6340 err = register_cpu_notifier(&conf->cpu_notify);
6341 if (err)
6342 return err;
6343#endif
6344
6345 get_online_cpus();
6346 for_each_present_cpu(cpu) {
6347 err = alloc_scratch_buffer(conf, per_cpu_ptr(conf->percpu, cpu));
6348 if (err) {
6349 pr_err("%s: failed memory allocation for cpu%ld\n",
6350 __func__, cpu);
6351 break;
6352 }
6353 }
6354 put_online_cpus();
6355
6356 return err;
6357}
6358
6359static unsigned long raid5_cache_scan(struct shrinker *shrink,
6360 struct shrink_control *sc)
6361{
6362 struct r5conf *conf = container_of(shrink, struct r5conf, shrinker);
6363 int ret = 0;
6364 while (ret < sc->nr_to_scan) {
6365 if (drop_one_stripe(conf) == 0)
6366 return SHRINK_STOP;
6367 ret++;
6368 }
6369 return ret;
6370}
6371
6372static unsigned long raid5_cache_count(struct shrinker *shrink,
6373 struct shrink_control *sc)
6374{
6375 struct r5conf *conf = container_of(shrink, struct r5conf, shrinker);
6376
6377 if (conf->max_nr_stripes < conf->min_nr_stripes)
6378
6379 return 0;
6380 return conf->max_nr_stripes - conf->min_nr_stripes;
6381}
6382
6383static struct r5conf *setup_conf(struct mddev *mddev)
6384{
6385 struct r5conf *conf;
6386 int raid_disk, memory, max_disks;
6387 struct md_rdev *rdev;
6388 struct disk_info *disk;
6389 char pers_name[6];
6390 int i;
6391 int group_cnt, worker_cnt_per_group;
6392 struct r5worker_group *new_group;
6393
6394 if (mddev->new_level != 5
6395 && mddev->new_level != 4
6396 && mddev->new_level != 6) {
6397 printk(KERN_ERR "md/raid:%s: raid level not set to 4/5/6 (%d)\n",
6398 mdname(mddev), mddev->new_level);
6399 return ERR_PTR(-EIO);
6400 }
6401 if ((mddev->new_level == 5
6402 && !algorithm_valid_raid5(mddev->new_layout)) ||
6403 (mddev->new_level == 6
6404 && !algorithm_valid_raid6(mddev->new_layout))) {
6405 printk(KERN_ERR "md/raid:%s: layout %d not supported\n",
6406 mdname(mddev), mddev->new_layout);
6407 return ERR_PTR(-EIO);
6408 }
6409 if (mddev->new_level == 6 && mddev->raid_disks < 4) {
6410 printk(KERN_ERR "md/raid:%s: not enough configured devices (%d, minimum 4)\n",
6411 mdname(mddev), mddev->raid_disks);
6412 return ERR_PTR(-EINVAL);
6413 }
6414
6415 if (!mddev->new_chunk_sectors ||
6416 (mddev->new_chunk_sectors << 9) % PAGE_SIZE ||
6417 !is_power_of_2(mddev->new_chunk_sectors)) {
6418 printk(KERN_ERR "md/raid:%s: invalid chunk size %d\n",
6419 mdname(mddev), mddev->new_chunk_sectors << 9);
6420 return ERR_PTR(-EINVAL);
6421 }
6422
6423 conf = kzalloc(sizeof(struct r5conf), GFP_KERNEL);
6424 if (conf == NULL)
6425 goto abort;
6426
6427 if (!alloc_thread_groups(conf, 0, &group_cnt, &worker_cnt_per_group,
6428 &new_group)) {
6429 conf->group_cnt = group_cnt;
6430 conf->worker_cnt_per_group = worker_cnt_per_group;
6431 conf->worker_groups = new_group;
6432 } else
6433 goto abort;
6434 spin_lock_init(&conf->device_lock);
6435 seqcount_init(&conf->gen_lock);
6436 init_waitqueue_head(&conf->wait_for_stripe);
6437 init_waitqueue_head(&conf->wait_for_overlap);
6438 INIT_LIST_HEAD(&conf->handle_list);
6439 INIT_LIST_HEAD(&conf->hold_list);
6440 INIT_LIST_HEAD(&conf->delayed_list);
6441 INIT_LIST_HEAD(&conf->bitmap_list);
6442 init_llist_head(&conf->released_stripes);
6443 atomic_set(&conf->active_stripes, 0);
6444 atomic_set(&conf->preread_active_stripes, 0);
6445 atomic_set(&conf->active_aligned_reads, 0);
6446 conf->bypass_threshold = BYPASS_THRESHOLD;
6447 conf->recovery_disabled = mddev->recovery_disabled - 1;
6448
6449 conf->raid_disks = mddev->raid_disks;
6450 if (mddev->reshape_position == MaxSector)
6451 conf->previous_raid_disks = mddev->raid_disks;
6452 else
6453 conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks;
6454 max_disks = max(conf->raid_disks, conf->previous_raid_disks);
6455
6456 conf->disks = kzalloc(max_disks * sizeof(struct disk_info),
6457 GFP_KERNEL);
6458 if (!conf->disks)
6459 goto abort;
6460
6461 conf->mddev = mddev;
6462
6463 if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL)
6464 goto abort;
6465
6466
6467
6468
6469
6470
6471 spin_lock_init(conf->hash_locks);
6472 for (i = 1; i < NR_STRIPE_HASH_LOCKS; i++)
6473 spin_lock_init(conf->hash_locks + i);
6474
6475 for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++)
6476 INIT_LIST_HEAD(conf->inactive_list + i);
6477
6478 for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++)
6479 INIT_LIST_HEAD(conf->temp_inactive_list + i);
6480
6481 conf->level = mddev->new_level;
6482 conf->chunk_sectors = mddev->new_chunk_sectors;
6483 if (raid5_alloc_percpu(conf) != 0)
6484 goto abort;
6485
6486 pr_debug("raid456: run(%s) called.\n", mdname(mddev));
6487
6488 rdev_for_each(rdev, mddev) {
6489 raid_disk = rdev->raid_disk;
6490 if (raid_disk >= max_disks
6491 || raid_disk < 0)
6492 continue;
6493 disk = conf->disks + raid_disk;
6494
6495 if (test_bit(Replacement, &rdev->flags)) {
6496 if (disk->replacement)
6497 goto abort;
6498 disk->replacement = rdev;
6499 } else {
6500 if (disk->rdev)
6501 goto abort;
6502 disk->rdev = rdev;
6503 }
6504
6505 if (test_bit(In_sync, &rdev->flags)) {
6506 char b[BDEVNAME_SIZE];
6507 printk(KERN_INFO "md/raid:%s: device %s operational as raid"
6508 " disk %d\n",
6509 mdname(mddev), bdevname(rdev->bdev, b), raid_disk);
6510 } else if (rdev->saved_raid_disk != raid_disk)
6511
6512 conf->fullsync = 1;
6513 }
6514
6515 conf->level = mddev->new_level;
6516 if (conf->level == 6) {
6517 conf->max_degraded = 2;
6518 if (raid6_call.xor_syndrome)
6519 conf->rmw_level = PARITY_ENABLE_RMW;
6520 else
6521 conf->rmw_level = PARITY_DISABLE_RMW;
6522 } else {
6523 conf->max_degraded = 1;
6524 conf->rmw_level = PARITY_ENABLE_RMW;
6525 }
6526 conf->algorithm = mddev->new_layout;
6527 conf->reshape_progress = mddev->reshape_position;
6528 if (conf->reshape_progress != MaxSector) {
6529 conf->prev_chunk_sectors = mddev->chunk_sectors;
6530 conf->prev_algo = mddev->layout;
6531 }
6532
6533 conf->min_nr_stripes = NR_STRIPES;
6534 memory = conf->min_nr_stripes * (sizeof(struct stripe_head) +
6535 max_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024;
6536 atomic_set(&conf->empty_inactive_list_nr, NR_STRIPE_HASH_LOCKS);
6537 if (grow_stripes(conf, conf->min_nr_stripes)) {
6538 printk(KERN_ERR
6539 "md/raid:%s: couldn't allocate %dkB for buffers\n",
6540 mdname(mddev), memory);
6541 goto abort;
6542 } else
6543 printk(KERN_INFO "md/raid:%s: allocated %dkB\n",
6544 mdname(mddev), memory);
6545
6546
6547
6548
6549
6550 conf->shrinker.seeks = DEFAULT_SEEKS * conf->raid_disks * 4;
6551 conf->shrinker.scan_objects = raid5_cache_scan;
6552 conf->shrinker.count_objects = raid5_cache_count;
6553 conf->shrinker.batch = 128;
6554 conf->shrinker.flags = 0;
6555 register_shrinker(&conf->shrinker);
6556
6557 sprintf(pers_name, "raid%d", mddev->new_level);
6558 conf->thread = md_register_thread(raid5d, mddev, pers_name);
6559 if (!conf->thread) {
6560 printk(KERN_ERR
6561 "md/raid:%s: couldn't allocate thread.\n",
6562 mdname(mddev));
6563 goto abort;
6564 }
6565
6566 return conf;
6567
6568 abort:
6569 if (conf) {
6570 free_conf(conf);
6571 return ERR_PTR(-EIO);
6572 } else
6573 return ERR_PTR(-ENOMEM);
6574}
6575
6576static int only_parity(int raid_disk, int algo, int raid_disks, int max_degraded)
6577{
6578 switch (algo) {
6579 case ALGORITHM_PARITY_0:
6580 if (raid_disk < max_degraded)
6581 return 1;
6582 break;
6583 case ALGORITHM_PARITY_N:
6584 if (raid_disk >= raid_disks - max_degraded)
6585 return 1;
6586 break;
6587 case ALGORITHM_PARITY_0_6:
6588 if (raid_disk == 0 ||
6589 raid_disk == raid_disks - 1)
6590 return 1;
6591 break;
6592 case ALGORITHM_LEFT_ASYMMETRIC_6:
6593 case ALGORITHM_RIGHT_ASYMMETRIC_6:
6594 case ALGORITHM_LEFT_SYMMETRIC_6:
6595 case ALGORITHM_RIGHT_SYMMETRIC_6:
6596 if (raid_disk == raid_disks - 1)
6597 return 1;
6598 }
6599 return 0;
6600}
6601
6602static int run(struct mddev *mddev)
6603{
6604 struct r5conf *conf;
6605 int working_disks = 0;
6606 int dirty_parity_disks = 0;
6607 struct md_rdev *rdev;
6608 sector_t reshape_offset = 0;
6609 int i;
6610 long long min_offset_diff = 0;
6611 int first = 1;
6612
6613 if (mddev->recovery_cp != MaxSector)
6614 printk(KERN_NOTICE "md/raid:%s: not clean"
6615 " -- starting background reconstruction\n",
6616 mdname(mddev));
6617
6618 rdev_for_each(rdev, mddev) {
6619 long long diff;
6620 if (rdev->raid_disk < 0)
6621 continue;
6622 diff = (rdev->new_data_offset - rdev->data_offset);
6623 if (first) {
6624 min_offset_diff = diff;
6625 first = 0;
6626 } else if (mddev->reshape_backwards &&
6627 diff < min_offset_diff)
6628 min_offset_diff = diff;
6629 else if (!mddev->reshape_backwards &&
6630 diff > min_offset_diff)
6631 min_offset_diff = diff;
6632 }
6633
6634 if (mddev->reshape_position != MaxSector) {
6635
6636
6637
6638
6639
6640
6641
6642
6643
6644
6645
6646
6647 sector_t here_new, here_old;
6648 int old_disks;
6649 int max_degraded = (mddev->level == 6 ? 2 : 1);
6650
6651 if (mddev->new_level != mddev->level) {
6652 printk(KERN_ERR "md/raid:%s: unsupported reshape "
6653 "required - aborting.\n",
6654 mdname(mddev));
6655 return -EINVAL;
6656 }
6657 old_disks = mddev->raid_disks - mddev->delta_disks;
6658
6659
6660
6661
6662 here_new = mddev->reshape_position;
6663 if (sector_div(here_new, mddev->new_chunk_sectors *
6664 (mddev->raid_disks - max_degraded))) {
6665 printk(KERN_ERR "md/raid:%s: reshape_position not "
6666 "on a stripe boundary\n", mdname(mddev));
6667 return -EINVAL;
6668 }
6669 reshape_offset = here_new * mddev->new_chunk_sectors;
6670
6671 here_old = mddev->reshape_position;
6672 sector_div(here_old, mddev->chunk_sectors *
6673 (old_disks-max_degraded));
6674
6675
6676 if (mddev->delta_disks == 0) {
6677 if ((here_new * mddev->new_chunk_sectors !=
6678 here_old * mddev->chunk_sectors)) {
6679 printk(KERN_ERR "md/raid:%s: reshape position is"
6680 " confused - aborting\n", mdname(mddev));
6681 return -EINVAL;
6682 }
6683
6684
6685
6686
6687
6688
6689
6690 if (abs(min_offset_diff) >= mddev->chunk_sectors &&
6691 abs(min_offset_diff) >= mddev->new_chunk_sectors)
6692 ;
6693 else if (mddev->ro == 0) {
6694 printk(KERN_ERR "md/raid:%s: in-place reshape "
6695 "must be started in read-only mode "
6696 "- aborting\n",
6697 mdname(mddev));
6698 return -EINVAL;
6699 }
6700 } else if (mddev->reshape_backwards
6701 ? (here_new * mddev->new_chunk_sectors + min_offset_diff <=
6702 here_old * mddev->chunk_sectors)
6703 : (here_new * mddev->new_chunk_sectors >=
6704 here_old * mddev->chunk_sectors + (-min_offset_diff))) {
6705
6706 printk(KERN_ERR "md/raid:%s: reshape_position too early for "
6707 "auto-recovery - aborting.\n",
6708 mdname(mddev));
6709 return -EINVAL;
6710 }
6711 printk(KERN_INFO "md/raid:%s: reshape will continue\n",
6712 mdname(mddev));
6713
6714 } else {
6715 BUG_ON(mddev->level != mddev->new_level);
6716 BUG_ON(mddev->layout != mddev->new_layout);
6717 BUG_ON(mddev->chunk_sectors != mddev->new_chunk_sectors);
6718 BUG_ON(mddev->delta_disks != 0);
6719 }
6720
6721 if (mddev->private == NULL)
6722 conf = setup_conf(mddev);
6723 else
6724 conf = mddev->private;
6725
6726 if (IS_ERR(conf))
6727 return PTR_ERR(conf);
6728
6729 conf->min_offset_diff = min_offset_diff;
6730 mddev->thread = conf->thread;
6731 conf->thread = NULL;
6732 mddev->private = conf;
6733
6734 for (i = 0; i < conf->raid_disks && conf->previous_raid_disks;
6735 i++) {
6736 rdev = conf->disks[i].rdev;
6737 if (!rdev && conf->disks[i].replacement) {
6738
6739 rdev = conf->disks[i].replacement;
6740 conf->disks[i].replacement = NULL;
6741 clear_bit(Replacement, &rdev->flags);
6742 conf->disks[i].rdev = rdev;
6743 }
6744 if (!rdev)
6745 continue;
6746 if (conf->disks[i].replacement &&
6747 conf->reshape_progress != MaxSector) {
6748
6749 printk(KERN_ERR "md: cannot handle concurrent "
6750 "replacement and reshape.\n");
6751 goto abort;
6752 }
6753 if (test_bit(In_sync, &rdev->flags)) {
6754 working_disks++;
6755 continue;
6756 }
6757
6758
6759
6760
6761
6762
6763
6764
6765
6766 if (mddev->major_version == 0 &&
6767 mddev->minor_version > 90)
6768 rdev->recovery_offset = reshape_offset;
6769
6770 if (rdev->recovery_offset < reshape_offset) {
6771
6772 if (!only_parity(rdev->raid_disk,
6773 conf->algorithm,
6774 conf->raid_disks,
6775 conf->max_degraded))
6776 continue;
6777 }
6778 if (!only_parity(rdev->raid_disk,
6779 conf->prev_algo,
6780 conf->previous_raid_disks,
6781 conf->max_degraded))
6782 continue;
6783 dirty_parity_disks++;
6784 }
6785
6786
6787
6788
6789 mddev->degraded = calc_degraded(conf);
6790
6791 if (has_failed(conf)) {
6792 printk(KERN_ERR "md/raid:%s: not enough operational devices"
6793 " (%d/%d failed)\n",
6794 mdname(mddev), mddev->degraded, conf->raid_disks);
6795 goto abort;
6796 }
6797
6798
6799 mddev->dev_sectors &= ~(mddev->chunk_sectors - 1);
6800 mddev->resync_max_sectors = mddev->dev_sectors;
6801
6802 if (mddev->degraded > dirty_parity_disks &&
6803 mddev->recovery_cp != MaxSector) {
6804 if (mddev->ok_start_degraded)
6805 printk(KERN_WARNING
6806 "md/raid:%s: starting dirty degraded array"
6807 " - data corruption possible.\n",
6808 mdname(mddev));
6809 else {
6810 printk(KERN_ERR
6811 "md/raid:%s: cannot start dirty degraded array.\n",
6812 mdname(mddev));
6813 goto abort;
6814 }
6815 }
6816
6817 if (mddev->degraded == 0)
6818 printk(KERN_INFO "md/raid:%s: raid level %d active with %d out of %d"
6819 " devices, algorithm %d\n", mdname(mddev), conf->level,
6820 mddev->raid_disks-mddev->degraded, mddev->raid_disks,
6821 mddev->new_layout);
6822 else
6823 printk(KERN_ALERT "md/raid:%s: raid level %d active with %d"
6824 " out of %d devices, algorithm %d\n",
6825 mdname(mddev), conf->level,
6826 mddev->raid_disks - mddev->degraded,
6827 mddev->raid_disks, mddev->new_layout);
6828
6829 print_raid5_conf(conf);
6830
6831 if (conf->reshape_progress != MaxSector) {
6832 conf->reshape_safe = conf->reshape_progress;
6833 atomic_set(&conf->reshape_stripes, 0);
6834 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6835 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
6836 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
6837 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6838 mddev->sync_thread = md_register_thread(md_do_sync, mddev,
6839 "reshape");
6840 }
6841
6842
6843 if (mddev->to_remove == &raid5_attrs_group)
6844 mddev->to_remove = NULL;
6845 else if (mddev->kobj.sd &&
6846 sysfs_create_group(&mddev->kobj, &raid5_attrs_group))
6847 printk(KERN_WARNING
6848 "raid5: failed to create sysfs attributes for %s\n",
6849 mdname(mddev));
6850 md_set_array_sectors(mddev, raid5_size(mddev, 0, 0));
6851
6852 if (mddev->queue) {
6853 int chunk_size;
6854 bool discard_supported = true;
6855
6856
6857
6858
6859 int data_disks = conf->previous_raid_disks - conf->max_degraded;
6860 int stripe = data_disks *
6861 ((mddev->chunk_sectors << 9) / PAGE_SIZE);
6862 if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe)
6863 mddev->queue->backing_dev_info.ra_pages = 2 * stripe;
6864
6865 chunk_size = mddev->chunk_sectors << 9;
6866 blk_queue_io_min(mddev->queue, chunk_size);
6867 blk_queue_io_opt(mddev->queue, chunk_size *
6868 (conf->raid_disks - conf->max_degraded));
6869 mddev->queue->limits.raid_partial_stripes_expensive = 1;
6870
6871
6872
6873
6874 stripe = stripe * PAGE_SIZE;
6875
6876
6877 while ((stripe-1) & stripe)
6878 stripe = (stripe | (stripe-1)) + 1;
6879 mddev->queue->limits.discard_alignment = stripe;
6880 mddev->queue->limits.discard_granularity = stripe;
6881
6882
6883
6884
6885 mddev->queue->limits.discard_zeroes_data = 0;
6886
6887 blk_queue_max_write_same_sectors(mddev->queue, 0);
6888
6889 rdev_for_each(rdev, mddev) {
6890 disk_stack_limits(mddev->gendisk, rdev->bdev,
6891 rdev->data_offset << 9);
6892 disk_stack_limits(mddev->gendisk, rdev->bdev,
6893 rdev->new_data_offset << 9);
6894
6895
6896
6897
6898
6899
6900
6901
6902
6903
6904 if (!blk_queue_discard(bdev_get_queue(rdev->bdev)) ||
6905 !bdev_get_queue(rdev->bdev)->
6906 limits.discard_zeroes_data)
6907 discard_supported = false;
6908
6909
6910
6911
6912
6913 if (!devices_handle_discard_safely) {
6914 if (discard_supported) {
6915 pr_info("md/raid456: discard support disabled due to uncertainty.\n");
6916 pr_info("Set raid456.devices_handle_discard_safely=Y to override.\n");
6917 }
6918 discard_supported = false;
6919 }
6920 }
6921
6922 if (discard_supported &&
6923 mddev->queue->limits.max_discard_sectors >= stripe &&
6924 mddev->queue->limits.discard_granularity >= stripe)
6925 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD,
6926 mddev->queue);
6927 else
6928 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD,
6929 mddev->queue);
6930 }
6931
6932 return 0;
6933abort:
6934 md_unregister_thread(&mddev->thread);
6935 print_raid5_conf(conf);
6936 free_conf(conf);
6937 mddev->private = NULL;
6938 printk(KERN_ALERT "md/raid:%s: failed to run raid set.\n", mdname(mddev));
6939 return -EIO;
6940}
6941
6942static void raid5_free(struct mddev *mddev, void *priv)
6943{
6944 struct r5conf *conf = priv;
6945
6946 free_conf(conf);
6947 mddev->to_remove = &raid5_attrs_group;
6948}
6949
6950static void status(struct seq_file *seq, struct mddev *mddev)
6951{
6952 struct r5conf *conf = mddev->private;
6953 int i;
6954
6955 seq_printf(seq, " level %d, %dk chunk, algorithm %d", mddev->level,
6956 mddev->chunk_sectors / 2, mddev->layout);
6957 seq_printf (seq, " [%d/%d] [", conf->raid_disks, conf->raid_disks - mddev->degraded);
6958 for (i = 0; i < conf->raid_disks; i++)
6959 seq_printf (seq, "%s",
6960 conf->disks[i].rdev &&
6961 test_bit(In_sync, &conf->disks[i].rdev->flags) ? "U" : "_");
6962 seq_printf (seq, "]");
6963}
6964
6965static void print_raid5_conf (struct r5conf *conf)
6966{
6967 int i;
6968 struct disk_info *tmp;
6969
6970 printk(KERN_DEBUG "RAID conf printout:\n");
6971 if (!conf) {
6972 printk("(conf==NULL)\n");
6973 return;
6974 }
6975 printk(KERN_DEBUG " --- level:%d rd:%d wd:%d\n", conf->level,
6976 conf->raid_disks,
6977 conf->raid_disks - conf->mddev->degraded);
6978
6979 for (i = 0; i < conf->raid_disks; i++) {
6980 char b[BDEVNAME_SIZE];
6981 tmp = conf->disks + i;
6982 if (tmp->rdev)
6983 printk(KERN_DEBUG " disk %d, o:%d, dev:%s\n",
6984 i, !test_bit(Faulty, &tmp->rdev->flags),
6985 bdevname(tmp->rdev->bdev, b));
6986 }
6987}
6988
6989static int raid5_spare_active(struct mddev *mddev)
6990{
6991 int i;
6992 struct r5conf *conf = mddev->private;
6993 struct disk_info *tmp;
6994 int count = 0;
6995 unsigned long flags;
6996
6997 for (i = 0; i < conf->raid_disks; i++) {
6998 tmp = conf->disks + i;
6999 if (tmp->replacement
7000 && tmp->replacement->recovery_offset == MaxSector
7001 && !test_bit(Faulty, &tmp->replacement->flags)
7002 && !test_and_set_bit(In_sync, &tmp->replacement->flags)) {
7003
7004 if (!tmp->rdev
7005 || !test_and_clear_bit(In_sync, &tmp->rdev->flags))
7006 count++;
7007 if (tmp->rdev) {
7008
7009
7010
7011
7012 set_bit(Faulty, &tmp->rdev->flags);
7013 sysfs_notify_dirent_safe(
7014 tmp->rdev->sysfs_state);
7015 }
7016 sysfs_notify_dirent_safe(tmp->replacement->sysfs_state);
7017 } else if (tmp->rdev
7018 && tmp->rdev->recovery_offset == MaxSector
7019 && !test_bit(Faulty, &tmp->rdev->flags)
7020 && !test_and_set_bit(In_sync, &tmp->rdev->flags)) {
7021 count++;
7022 sysfs_notify_dirent_safe(tmp->rdev->sysfs_state);
7023 }
7024 }
7025 spin_lock_irqsave(&conf->device_lock, flags);
7026 mddev->degraded = calc_degraded(conf);
7027 spin_unlock_irqrestore(&conf->device_lock, flags);
7028 print_raid5_conf(conf);
7029 return count;
7030}
7031
7032static int raid5_remove_disk(struct mddev *mddev, struct md_rdev *rdev)
7033{
7034 struct r5conf *conf = mddev->private;
7035 int err = 0;
7036 int number = rdev->raid_disk;
7037 struct md_rdev **rdevp;
7038 struct disk_info *p = conf->disks + number;
7039
7040 print_raid5_conf(conf);
7041 if (rdev == p->rdev)
7042 rdevp = &p->rdev;
7043 else if (rdev == p->replacement)
7044 rdevp = &p->replacement;
7045 else
7046 return 0;
7047
7048 if (number >= conf->raid_disks &&
7049 conf->reshape_progress == MaxSector)
7050 clear_bit(In_sync, &rdev->flags);
7051
7052 if (test_bit(In_sync, &rdev->flags) ||
7053 atomic_read(&rdev->nr_pending)) {
7054 err = -EBUSY;
7055 goto abort;
7056 }
7057
7058
7059
7060 if (!test_bit(Faulty, &rdev->flags) &&
7061 mddev->recovery_disabled != conf->recovery_disabled &&
7062 !has_failed(conf) &&
7063 (!p->replacement || p->replacement == rdev) &&
7064 number < conf->raid_disks) {
7065 err = -EBUSY;
7066 goto abort;
7067 }
7068 *rdevp = NULL;
7069 synchronize_rcu();
7070 if (atomic_read(&rdev->nr_pending)) {
7071
7072 err = -EBUSY;
7073 *rdevp = rdev;
7074 } else if (p->replacement) {
7075
7076 p->rdev = p->replacement;
7077 clear_bit(Replacement, &p->replacement->flags);
7078 smp_mb();
7079
7080
7081 p->replacement = NULL;
7082 clear_bit(WantReplacement, &rdev->flags);
7083 } else
7084
7085
7086
7087 clear_bit(WantReplacement, &rdev->flags);
7088abort:
7089
7090 print_raid5_conf(conf);
7091 return err;
7092}
7093
7094static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev)
7095{
7096 struct r5conf *conf = mddev->private;
7097 int err = -EEXIST;
7098 int disk;
7099 struct disk_info *p;
7100 int first = 0;
7101 int last = conf->raid_disks - 1;
7102
7103 if (mddev->recovery_disabled == conf->recovery_disabled)
7104 return -EBUSY;
7105
7106 if (rdev->saved_raid_disk < 0 && has_failed(conf))
7107
7108 return -EINVAL;
7109
7110 if (rdev->raid_disk >= 0)
7111 first = last = rdev->raid_disk;
7112
7113
7114
7115
7116
7117 if (rdev->saved_raid_disk >= 0 &&
7118 rdev->saved_raid_disk >= first &&
7119 conf->disks[rdev->saved_raid_disk].rdev == NULL)
7120 first = rdev->saved_raid_disk;
7121
7122 for (disk = first; disk <= last; disk++) {
7123 p = conf->disks + disk;
7124 if (p->rdev == NULL) {
7125 clear_bit(In_sync, &rdev->flags);
7126 rdev->raid_disk = disk;
7127 err = 0;
7128 if (rdev->saved_raid_disk != disk)
7129 conf->fullsync = 1;
7130 rcu_assign_pointer(p->rdev, rdev);
7131 goto out;
7132 }
7133 }
7134 for (disk = first; disk <= last; disk++) {
7135 p = conf->disks + disk;
7136 if (test_bit(WantReplacement, &p->rdev->flags) &&
7137 p->replacement == NULL) {
7138 clear_bit(In_sync, &rdev->flags);
7139 set_bit(Replacement, &rdev->flags);
7140 rdev->raid_disk = disk;
7141 err = 0;
7142 conf->fullsync = 1;
7143 rcu_assign_pointer(p->replacement, rdev);
7144 break;
7145 }
7146 }
7147out:
7148 print_raid5_conf(conf);
7149 return err;
7150}
7151
7152static int raid5_resize(struct mddev *mddev, sector_t sectors)
7153{
7154
7155
7156
7157
7158
7159
7160
7161 sector_t newsize;
7162 sectors &= ~((sector_t)mddev->chunk_sectors - 1);
7163 newsize = raid5_size(mddev, sectors, mddev->raid_disks);
7164 if (mddev->external_size &&
7165 mddev->array_sectors > newsize)
7166 return -EINVAL;
7167 if (mddev->bitmap) {
7168 int ret = bitmap_resize(mddev->bitmap, sectors, 0, 0);
7169 if (ret)
7170 return ret;
7171 }
7172 md_set_array_sectors(mddev, newsize);
7173 set_capacity(mddev->gendisk, mddev->array_sectors);
7174 revalidate_disk(mddev->gendisk);
7175 if (sectors > mddev->dev_sectors &&
7176 mddev->recovery_cp > mddev->dev_sectors) {
7177 mddev->recovery_cp = mddev->dev_sectors;
7178 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7179 }
7180 mddev->dev_sectors = sectors;
7181 mddev->resync_max_sectors = sectors;
7182 return 0;
7183}
7184
7185static int check_stripe_cache(struct mddev *mddev)
7186{
7187
7188
7189
7190
7191
7192
7193
7194
7195 struct r5conf *conf = mddev->private;
7196 if (((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4
7197 > conf->min_nr_stripes ||
7198 ((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4
7199 > conf->min_nr_stripes) {
7200 printk(KERN_WARNING "md/raid:%s: reshape: not enough stripes. Needed %lu\n",
7201 mdname(mddev),
7202 ((max(mddev->chunk_sectors, mddev->new_chunk_sectors) << 9)
7203 / STRIPE_SIZE)*4);
7204 return 0;
7205 }
7206 return 1;
7207}
7208
7209static int check_reshape(struct mddev *mddev)
7210{
7211 struct r5conf *conf = mddev->private;
7212
7213 if (mddev->delta_disks == 0 &&
7214 mddev->new_layout == mddev->layout &&
7215 mddev->new_chunk_sectors == mddev->chunk_sectors)
7216 return 0;
7217 if (has_failed(conf))
7218 return -EINVAL;
7219 if (mddev->delta_disks < 0 && mddev->reshape_position == MaxSector) {
7220
7221
7222
7223
7224
7225 int min = 2;
7226 if (mddev->level == 6)
7227 min = 4;
7228 if (mddev->raid_disks + mddev->delta_disks < min)
7229 return -EINVAL;
7230 }
7231
7232 if (!check_stripe_cache(mddev))
7233 return -ENOSPC;
7234
7235 if (mddev->new_chunk_sectors > mddev->chunk_sectors ||
7236 mddev->delta_disks > 0)
7237 if (resize_chunks(conf,
7238 conf->previous_raid_disks
7239 + max(0, mddev->delta_disks),
7240 max(mddev->new_chunk_sectors,
7241 mddev->chunk_sectors)
7242 ) < 0)
7243 return -ENOMEM;
7244 return resize_stripes(conf, (conf->previous_raid_disks
7245 + mddev->delta_disks));
7246}
7247
7248static int raid5_start_reshape(struct mddev *mddev)
7249{
7250 struct r5conf *conf = mddev->private;
7251 struct md_rdev *rdev;
7252 int spares = 0;
7253 unsigned long flags;
7254
7255 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
7256 return -EBUSY;
7257
7258 if (!check_stripe_cache(mddev))
7259 return -ENOSPC;
7260
7261 if (has_failed(conf))
7262 return -EINVAL;
7263
7264 rdev_for_each(rdev, mddev) {
7265 if (!test_bit(In_sync, &rdev->flags)
7266 && !test_bit(Faulty, &rdev->flags))
7267 spares++;
7268 }
7269
7270 if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded)
7271
7272
7273
7274 return -EINVAL;
7275
7276
7277
7278
7279
7280 if (raid5_size(mddev, 0, conf->raid_disks + mddev->delta_disks)
7281 < mddev->array_sectors) {
7282 printk(KERN_ERR "md/raid:%s: array size must be reduced "
7283 "before number of disks\n", mdname(mddev));
7284 return -EINVAL;
7285 }
7286
7287 atomic_set(&conf->reshape_stripes, 0);
7288 spin_lock_irq(&conf->device_lock);
7289 write_seqcount_begin(&conf->gen_lock);
7290 conf->previous_raid_disks = conf->raid_disks;
7291 conf->raid_disks += mddev->delta_disks;
7292 conf->prev_chunk_sectors = conf->chunk_sectors;
7293 conf->chunk_sectors = mddev->new_chunk_sectors;
7294 conf->prev_algo = conf->algorithm;
7295 conf->algorithm = mddev->new_layout;
7296 conf->generation++;
7297
7298
7299
7300 smp_mb();
7301 if (mddev->reshape_backwards)
7302 conf->reshape_progress = raid5_size(mddev, 0, 0);
7303 else
7304 conf->reshape_progress = 0;
7305 conf->reshape_safe = conf->reshape_progress;
7306 write_seqcount_end(&conf->gen_lock);
7307 spin_unlock_irq(&conf->device_lock);
7308
7309
7310
7311
7312
7313 mddev_suspend(mddev);
7314 mddev_resume(mddev);
7315
7316
7317
7318
7319
7320
7321
7322
7323 if (mddev->delta_disks >= 0) {
7324 rdev_for_each(rdev, mddev)
7325 if (rdev->raid_disk < 0 &&
7326 !test_bit(Faulty, &rdev->flags)) {
7327 if (raid5_add_disk(mddev, rdev) == 0) {
7328 if (rdev->raid_disk
7329 >= conf->previous_raid_disks)
7330 set_bit(In_sync, &rdev->flags);
7331 else
7332 rdev->recovery_offset = 0;
7333
7334 if (sysfs_link_rdev(mddev, rdev))
7335 ;
7336 }
7337 } else if (rdev->raid_disk >= conf->previous_raid_disks
7338 && !test_bit(Faulty, &rdev->flags)) {
7339
7340 set_bit(In_sync, &rdev->flags);
7341 }
7342
7343
7344
7345
7346
7347 spin_lock_irqsave(&conf->device_lock, flags);
7348 mddev->degraded = calc_degraded(conf);
7349 spin_unlock_irqrestore(&conf->device_lock, flags);
7350 }
7351 mddev->raid_disks = conf->raid_disks;
7352 mddev->reshape_position = conf->reshape_progress;
7353 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7354
7355 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7356 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7357 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7358 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7359 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7360 mddev->sync_thread = md_register_thread(md_do_sync, mddev,
7361 "reshape");
7362 if (!mddev->sync_thread) {
7363 mddev->recovery = 0;
7364 spin_lock_irq(&conf->device_lock);
7365 write_seqcount_begin(&conf->gen_lock);
7366 mddev->raid_disks = conf->raid_disks = conf->previous_raid_disks;
7367 mddev->new_chunk_sectors =
7368 conf->chunk_sectors = conf->prev_chunk_sectors;
7369 mddev->new_layout = conf->algorithm = conf->prev_algo;
7370 rdev_for_each(rdev, mddev)
7371 rdev->new_data_offset = rdev->data_offset;
7372 smp_wmb();
7373 conf->generation --;
7374 conf->reshape_progress = MaxSector;
7375 mddev->reshape_position = MaxSector;
7376 write_seqcount_end(&conf->gen_lock);
7377 spin_unlock_irq(&conf->device_lock);
7378 return -EAGAIN;
7379 }
7380 conf->reshape_checkpoint = jiffies;
7381 md_wakeup_thread(mddev->sync_thread);
7382 md_new_event(mddev);
7383 return 0;
7384}
7385
7386
7387
7388
7389static void end_reshape(struct r5conf *conf)
7390{
7391
7392 if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) {
7393 struct md_rdev *rdev;
7394
7395 spin_lock_irq(&conf->device_lock);
7396 conf->previous_raid_disks = conf->raid_disks;
7397 rdev_for_each(rdev, conf->mddev)
7398 rdev->data_offset = rdev->new_data_offset;
7399 smp_wmb();
7400 conf->reshape_progress = MaxSector;
7401 spin_unlock_irq(&conf->device_lock);
7402 wake_up(&conf->wait_for_overlap);
7403
7404
7405
7406
7407 if (conf->mddev->queue) {
7408 int data_disks = conf->raid_disks - conf->max_degraded;
7409 int stripe = data_disks * ((conf->chunk_sectors << 9)
7410 / PAGE_SIZE);
7411 if (conf->mddev->queue->backing_dev_info.ra_pages < 2 * stripe)
7412 conf->mddev->queue->backing_dev_info.ra_pages = 2 * stripe;
7413 }
7414 }
7415}
7416
7417
7418
7419
7420static void raid5_finish_reshape(struct mddev *mddev)
7421{
7422 struct r5conf *conf = mddev->private;
7423
7424 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7425
7426 if (mddev->delta_disks > 0) {
7427 md_set_array_sectors(mddev, raid5_size(mddev, 0, 0));
7428 set_capacity(mddev->gendisk, mddev->array_sectors);
7429 revalidate_disk(mddev->gendisk);
7430 } else {
7431 int d;
7432 spin_lock_irq(&conf->device_lock);
7433 mddev->degraded = calc_degraded(conf);
7434 spin_unlock_irq(&conf->device_lock);
7435 for (d = conf->raid_disks ;
7436 d < conf->raid_disks - mddev->delta_disks;
7437 d++) {
7438 struct md_rdev *rdev = conf->disks[d].rdev;
7439 if (rdev)
7440 clear_bit(In_sync, &rdev->flags);
7441 rdev = conf->disks[d].replacement;
7442 if (rdev)
7443 clear_bit(In_sync, &rdev->flags);
7444 }
7445 }
7446 mddev->layout = conf->algorithm;
7447 mddev->chunk_sectors = conf->chunk_sectors;
7448 mddev->reshape_position = MaxSector;
7449 mddev->delta_disks = 0;
7450 mddev->reshape_backwards = 0;
7451 }
7452}
7453
7454static void raid5_quiesce(struct mddev *mddev, int state)
7455{
7456 struct r5conf *conf = mddev->private;
7457
7458 switch(state) {
7459 case 2:
7460 wake_up(&conf->wait_for_overlap);
7461 break;
7462
7463 case 1:
7464 lock_all_device_hash_locks_irq(conf);
7465
7466
7467
7468 conf->quiesce = 2;
7469 wait_event_cmd(conf->wait_for_stripe,
7470 atomic_read(&conf->active_stripes) == 0 &&
7471 atomic_read(&conf->active_aligned_reads) == 0,
7472 unlock_all_device_hash_locks_irq(conf),
7473 lock_all_device_hash_locks_irq(conf));
7474 conf->quiesce = 1;
7475 unlock_all_device_hash_locks_irq(conf);
7476
7477 wake_up(&conf->wait_for_overlap);
7478 break;
7479
7480 case 0:
7481 lock_all_device_hash_locks_irq(conf);
7482 conf->quiesce = 0;
7483 wake_up(&conf->wait_for_stripe);
7484 wake_up(&conf->wait_for_overlap);
7485 unlock_all_device_hash_locks_irq(conf);
7486 break;
7487 }
7488}
7489
7490static void *raid45_takeover_raid0(struct mddev *mddev, int level)
7491{
7492 struct r0conf *raid0_conf = mddev->private;
7493 sector_t sectors;
7494
7495
7496 if (raid0_conf->nr_strip_zones > 1) {
7497 printk(KERN_ERR "md/raid:%s: cannot takeover raid0 with more than one zone.\n",
7498 mdname(mddev));
7499 return ERR_PTR(-EINVAL);
7500 }
7501
7502 sectors = raid0_conf->strip_zone[0].zone_end;
7503 sector_div(sectors, raid0_conf->strip_zone[0].nb_dev);
7504 mddev->dev_sectors = sectors;
7505 mddev->new_level = level;
7506 mddev->new_layout = ALGORITHM_PARITY_N;
7507 mddev->new_chunk_sectors = mddev->chunk_sectors;
7508 mddev->raid_disks += 1;
7509 mddev->delta_disks = 1;
7510
7511 mddev->recovery_cp = MaxSector;
7512
7513 return setup_conf(mddev);
7514}
7515
7516static void *raid5_takeover_raid1(struct mddev *mddev)
7517{
7518 int chunksect;
7519
7520 if (mddev->raid_disks != 2 ||
7521 mddev->degraded > 1)
7522 return ERR_PTR(-EINVAL);
7523
7524
7525
7526 chunksect = 64*2;
7527
7528
7529 while (chunksect && (mddev->array_sectors & (chunksect-1)))
7530 chunksect >>= 1;
7531
7532 if ((chunksect<<9) < STRIPE_SIZE)
7533
7534 return ERR_PTR(-EINVAL);
7535
7536 mddev->new_level = 5;
7537 mddev->new_layout = ALGORITHM_LEFT_SYMMETRIC;
7538 mddev->new_chunk_sectors = chunksect;
7539
7540 return setup_conf(mddev);
7541}
7542
7543static void *raid5_takeover_raid6(struct mddev *mddev)
7544{
7545 int new_layout;
7546
7547 switch (mddev->layout) {
7548 case ALGORITHM_LEFT_ASYMMETRIC_6:
7549 new_layout = ALGORITHM_LEFT_ASYMMETRIC;
7550 break;
7551 case ALGORITHM_RIGHT_ASYMMETRIC_6:
7552 new_layout = ALGORITHM_RIGHT_ASYMMETRIC;
7553 break;
7554 case ALGORITHM_LEFT_SYMMETRIC_6:
7555 new_layout = ALGORITHM_LEFT_SYMMETRIC;
7556 break;
7557 case ALGORITHM_RIGHT_SYMMETRIC_6:
7558 new_layout = ALGORITHM_RIGHT_SYMMETRIC;
7559 break;
7560 case ALGORITHM_PARITY_0_6:
7561 new_layout = ALGORITHM_PARITY_0;
7562 break;
7563 case ALGORITHM_PARITY_N:
7564 new_layout = ALGORITHM_PARITY_N;
7565 break;
7566 default:
7567 return ERR_PTR(-EINVAL);
7568 }
7569 mddev->new_level = 5;
7570 mddev->new_layout = new_layout;
7571 mddev->delta_disks = -1;
7572 mddev->raid_disks -= 1;
7573 return setup_conf(mddev);
7574}
7575
7576static int raid5_check_reshape(struct mddev *mddev)
7577{
7578
7579
7580
7581
7582
7583 struct r5conf *conf = mddev->private;
7584 int new_chunk = mddev->new_chunk_sectors;
7585
7586 if (mddev->new_layout >= 0 && !algorithm_valid_raid5(mddev->new_layout))
7587 return -EINVAL;
7588 if (new_chunk > 0) {
7589 if (!is_power_of_2(new_chunk))
7590 return -EINVAL;
7591 if (new_chunk < (PAGE_SIZE>>9))
7592 return -EINVAL;
7593 if (mddev->array_sectors & (new_chunk-1))
7594
7595 return -EINVAL;
7596 }
7597
7598
7599
7600 if (mddev->raid_disks == 2) {
7601
7602 if (mddev->new_layout >= 0) {
7603 conf->algorithm = mddev->new_layout;
7604 mddev->layout = mddev->new_layout;
7605 }
7606 if (new_chunk > 0) {
7607 conf->chunk_sectors = new_chunk ;
7608 mddev->chunk_sectors = new_chunk;
7609 }
7610 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7611 md_wakeup_thread(mddev->thread);
7612 }
7613 return check_reshape(mddev);
7614}
7615
7616static int raid6_check_reshape(struct mddev *mddev)
7617{
7618 int new_chunk = mddev->new_chunk_sectors;
7619
7620 if (mddev->new_layout >= 0 && !algorithm_valid_raid6(mddev->new_layout))
7621 return -EINVAL;
7622 if (new_chunk > 0) {
7623 if (!is_power_of_2(new_chunk))
7624 return -EINVAL;
7625 if (new_chunk < (PAGE_SIZE >> 9))
7626 return -EINVAL;
7627 if (mddev->array_sectors & (new_chunk-1))
7628
7629 return -EINVAL;
7630 }
7631
7632
7633 return check_reshape(mddev);
7634}
7635
7636static void *raid5_takeover(struct mddev *mddev)
7637{
7638
7639
7640
7641
7642
7643
7644 if (mddev->level == 0)
7645 return raid45_takeover_raid0(mddev, 5);
7646 if (mddev->level == 1)
7647 return raid5_takeover_raid1(mddev);
7648 if (mddev->level == 4) {
7649 mddev->new_layout = ALGORITHM_PARITY_N;
7650 mddev->new_level = 5;
7651 return setup_conf(mddev);
7652 }
7653 if (mddev->level == 6)
7654 return raid5_takeover_raid6(mddev);
7655
7656 return ERR_PTR(-EINVAL);
7657}
7658
7659static void *raid4_takeover(struct mddev *mddev)
7660{
7661
7662
7663
7664
7665 if (mddev->level == 0)
7666 return raid45_takeover_raid0(mddev, 4);
7667 if (mddev->level == 5 &&
7668 mddev->layout == ALGORITHM_PARITY_N) {
7669 mddev->new_layout = 0;
7670 mddev->new_level = 4;
7671 return setup_conf(mddev);
7672 }
7673 return ERR_PTR(-EINVAL);
7674}
7675
7676static struct md_personality raid5_personality;
7677
7678static void *raid6_takeover(struct mddev *mddev)
7679{
7680
7681
7682
7683
7684 int new_layout;
7685
7686 if (mddev->pers != &raid5_personality)
7687 return ERR_PTR(-EINVAL);
7688 if (mddev->degraded > 1)
7689 return ERR_PTR(-EINVAL);
7690 if (mddev->raid_disks > 253)
7691 return ERR_PTR(-EINVAL);
7692 if (mddev->raid_disks < 3)
7693 return ERR_PTR(-EINVAL);
7694
7695 switch (mddev->layout) {
7696 case ALGORITHM_LEFT_ASYMMETRIC:
7697 new_layout = ALGORITHM_LEFT_ASYMMETRIC_6;
7698 break;
7699 case ALGORITHM_RIGHT_ASYMMETRIC:
7700 new_layout = ALGORITHM_RIGHT_ASYMMETRIC_6;
7701 break;
7702 case ALGORITHM_LEFT_SYMMETRIC:
7703 new_layout = ALGORITHM_LEFT_SYMMETRIC_6;
7704 break;
7705 case ALGORITHM_RIGHT_SYMMETRIC:
7706 new_layout = ALGORITHM_RIGHT_SYMMETRIC_6;
7707 break;
7708 case ALGORITHM_PARITY_0:
7709 new_layout = ALGORITHM_PARITY_0_6;
7710 break;
7711 case ALGORITHM_PARITY_N:
7712 new_layout = ALGORITHM_PARITY_N;
7713 break;
7714 default:
7715 return ERR_PTR(-EINVAL);
7716 }
7717 mddev->new_level = 6;
7718 mddev->new_layout = new_layout;
7719 mddev->delta_disks = 1;
7720 mddev->raid_disks += 1;
7721 return setup_conf(mddev);
7722}
7723
7724static struct md_personality raid6_personality =
7725{
7726 .name = "raid6",
7727 .level = 6,
7728 .owner = THIS_MODULE,
7729 .make_request = make_request,
7730 .run = run,
7731 .free = raid5_free,
7732 .status = status,
7733 .error_handler = error,
7734 .hot_add_disk = raid5_add_disk,
7735 .hot_remove_disk= raid5_remove_disk,
7736 .spare_active = raid5_spare_active,
7737 .sync_request = sync_request,
7738 .resize = raid5_resize,
7739 .size = raid5_size,
7740 .check_reshape = raid6_check_reshape,
7741 .start_reshape = raid5_start_reshape,
7742 .finish_reshape = raid5_finish_reshape,
7743 .quiesce = raid5_quiesce,
7744 .takeover = raid6_takeover,
7745 .congested = raid5_congested,
7746 .mergeable_bvec = raid5_mergeable_bvec,
7747};
7748static struct md_personality raid5_personality =
7749{
7750 .name = "raid5",
7751 .level = 5,
7752 .owner = THIS_MODULE,
7753 .make_request = make_request,
7754 .run = run,
7755 .free = raid5_free,
7756 .status = status,
7757 .error_handler = error,
7758 .hot_add_disk = raid5_add_disk,
7759 .hot_remove_disk= raid5_remove_disk,
7760 .spare_active = raid5_spare_active,
7761 .sync_request = sync_request,
7762 .resize = raid5_resize,
7763 .size = raid5_size,
7764 .check_reshape = raid5_check_reshape,
7765 .start_reshape = raid5_start_reshape,
7766 .finish_reshape = raid5_finish_reshape,
7767 .quiesce = raid5_quiesce,
7768 .takeover = raid5_takeover,
7769 .congested = raid5_congested,
7770 .mergeable_bvec = raid5_mergeable_bvec,
7771};
7772
7773static struct md_personality raid4_personality =
7774{
7775 .name = "raid4",
7776 .level = 4,
7777 .owner = THIS_MODULE,
7778 .make_request = make_request,
7779 .run = run,
7780 .free = raid5_free,
7781 .status = status,
7782 .error_handler = error,
7783 .hot_add_disk = raid5_add_disk,
7784 .hot_remove_disk= raid5_remove_disk,
7785 .spare_active = raid5_spare_active,
7786 .sync_request = sync_request,
7787 .resize = raid5_resize,
7788 .size = raid5_size,
7789 .check_reshape = raid5_check_reshape,
7790 .start_reshape = raid5_start_reshape,
7791 .finish_reshape = raid5_finish_reshape,
7792 .quiesce = raid5_quiesce,
7793 .takeover = raid4_takeover,
7794 .congested = raid5_congested,
7795 .mergeable_bvec = raid5_mergeable_bvec,
7796};
7797
7798static int __init raid5_init(void)
7799{
7800 raid5_wq = alloc_workqueue("raid5wq",
7801 WQ_UNBOUND|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE|WQ_SYSFS, 0);
7802 if (!raid5_wq)
7803 return -ENOMEM;
7804 register_md_personality(&raid6_personality);
7805 register_md_personality(&raid5_personality);
7806 register_md_personality(&raid4_personality);
7807 return 0;
7808}
7809
7810static void raid5_exit(void)
7811{
7812 unregister_md_personality(&raid6_personality);
7813 unregister_md_personality(&raid5_personality);
7814 unregister_md_personality(&raid4_personality);
7815 destroy_workqueue(raid5_wq);
7816}
7817
7818module_init(raid5_init);
7819module_exit(raid5_exit);
7820MODULE_LICENSE("GPL");
7821MODULE_DESCRIPTION("RAID4/5/6 (striping with parity) personality for MD");
7822MODULE_ALIAS("md-personality-4");
7823MODULE_ALIAS("md-raid5");
7824MODULE_ALIAS("md-raid4");
7825MODULE_ALIAS("md-level-5");
7826MODULE_ALIAS("md-level-4");
7827MODULE_ALIAS("md-personality-8");
7828MODULE_ALIAS("md-raid6");
7829MODULE_ALIAS("md-level-6");
7830
7831
7832MODULE_ALIAS("raid5");
7833MODULE_ALIAS("raid6");
7834