Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * raid5.c : Multiple Devices driver for Linux | |
3 | * Copyright (C) 1996, 1997 Ingo Molnar, Miguel de Icaza, Gadi Oxman | |
4 | * Copyright (C) 1999, 2000 Ingo Molnar | |
16a53ecc | 5 | * Copyright (C) 2002, 2003 H. Peter Anvin |
1da177e4 | 6 | * |
16a53ecc N |
7 | * RAID-4/5/6 management functions. |
8 | * Thanks to Penguin Computing for making the RAID-6 development possible | |
9 | * by donating a test server! | |
1da177e4 LT |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2, or (at your option) | |
14 | * any later version. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * (for example /usr/src/linux/COPYING); if not, write to the Free | |
18 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
20 | ||
ae3c20cc N |
21 | /* |
22 | * BITMAP UNPLUGGING: | |
23 | * | |
24 | * The sequencing for updating the bitmap reliably is a little | |
25 | * subtle (and I got it wrong the first time) so it deserves some | |
26 | * explanation. | |
27 | * | |
28 | * We group bitmap updates into batches. Each batch has a number. | |
29 | * We may write out several batches at once, but that isn't very important. | |
7c13edc8 N |
30 | * conf->seq_write is the number of the last batch successfully written. |
31 | * conf->seq_flush is the number of the last batch that was closed to | |
ae3c20cc N |
32 | * new additions. |
33 | * When we discover that we will need to write to any block in a stripe | |
34 | * (in add_stripe_bio) we update the in-memory bitmap and record in sh->bm_seq | |
7c13edc8 | 35 | * the number of the batch it will be in. This is seq_flush+1. |
ae3c20cc N |
36 | * When we are ready to do a write, if that batch hasn't been written yet, |
37 | * we plug the array and queue the stripe for later. | |
38 | * When an unplug happens, we increment bm_flush, thus closing the current | |
39 | * batch. | |
40 | * When we notice that bm_flush > bm_write, we write out all pending updates | |
41 | * to the bitmap, and advance bm_write to where bm_flush was. | |
42 | * This may occasionally write a bit out twice, but is sure never to | |
43 | * miss any bits. | |
44 | */ | |
1da177e4 | 45 | |
bff61975 | 46 | #include <linux/blkdev.h> |
f6705578 | 47 | #include <linux/kthread.h> |
f701d589 | 48 | #include <linux/raid/pq.h> |
91c00924 | 49 | #include <linux/async_tx.h> |
056075c7 | 50 | #include <linux/module.h> |
07a3b417 | 51 | #include <linux/async.h> |
bff61975 | 52 | #include <linux/seq_file.h> |
36d1c647 | 53 | #include <linux/cpu.h> |
5a0e3ad6 | 54 | #include <linux/slab.h> |
8bda470e | 55 | #include <linux/ratelimit.h> |
851c30c9 | 56 | #include <linux/nodemask.h> |
a9add5d9 N |
57 | #include <trace/events/block.h> |
58 | ||
43b2e5d8 | 59 | #include "md.h" |
bff61975 | 60 | #include "raid5.h" |
54071b38 | 61 | #include "raid0.h" |
ef740c37 | 62 | #include "bitmap.h" |
72626685 | 63 | |
851c30c9 SL |
64 | #define cpu_to_group(cpu) cpu_to_node(cpu) |
65 | #define ANY_GROUP NUMA_NO_NODE | |
66 | ||
8e0e99ba N |
67 | static bool devices_handle_discard_safely = false; |
68 | module_param(devices_handle_discard_safely, bool, 0644); | |
69 | MODULE_PARM_DESC(devices_handle_discard_safely, | |
70 | "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions"); | |
851c30c9 | 71 | static struct workqueue_struct *raid5_wq; |
1da177e4 LT |
72 | /* |
73 | * Stripe cache | |
74 | */ | |
75 | ||
76 | #define NR_STRIPES 256 | |
77 | #define STRIPE_SIZE PAGE_SIZE | |
78 | #define STRIPE_SHIFT (PAGE_SHIFT - 9) | |
79 | #define STRIPE_SECTORS (STRIPE_SIZE>>9) | |
80 | #define IO_THRESHOLD 1 | |
8b3e6cdc | 81 | #define BYPASS_THRESHOLD 1 |
fccddba0 | 82 | #define NR_HASH (PAGE_SIZE / sizeof(struct hlist_head)) |
1da177e4 | 83 | #define HASH_MASK (NR_HASH - 1) |
bfc90cb0 | 84 | #define MAX_STRIPE_BATCH 8 |
1da177e4 | 85 | |
d1688a6d | 86 | static inline struct hlist_head *stripe_hash(struct r5conf *conf, sector_t sect) |
db298e19 N |
87 | { |
88 | int hash = (sect >> STRIPE_SHIFT) & HASH_MASK; | |
89 | return &conf->stripe_hashtbl[hash]; | |
90 | } | |
1da177e4 | 91 | |
566c09c5 SL |
92 | static inline int stripe_hash_locks_hash(sector_t sect) |
93 | { | |
94 | return (sect >> STRIPE_SHIFT) & STRIPE_HASH_LOCKS_MASK; | |
95 | } | |
96 | ||
97 | static inline void lock_device_hash_lock(struct r5conf *conf, int hash) | |
98 | { | |
99 | spin_lock_irq(conf->hash_locks + hash); | |
100 | spin_lock(&conf->device_lock); | |
101 | } | |
102 | ||
103 | static inline void unlock_device_hash_lock(struct r5conf *conf, int hash) | |
104 | { | |
105 | spin_unlock(&conf->device_lock); | |
106 | spin_unlock_irq(conf->hash_locks + hash); | |
107 | } | |
108 | ||
109 | static inline void lock_all_device_hash_locks_irq(struct r5conf *conf) | |
110 | { | |
111 | int i; | |
112 | local_irq_disable(); | |
113 | spin_lock(conf->hash_locks); | |
114 | for (i = 1; i < NR_STRIPE_HASH_LOCKS; i++) | |
115 | spin_lock_nest_lock(conf->hash_locks + i, conf->hash_locks); | |
116 | spin_lock(&conf->device_lock); | |
117 | } | |
118 | ||
119 | static inline void unlock_all_device_hash_locks_irq(struct r5conf *conf) | |
120 | { | |
121 | int i; | |
122 | spin_unlock(&conf->device_lock); | |
123 | for (i = NR_STRIPE_HASH_LOCKS; i; i--) | |
124 | spin_unlock(conf->hash_locks + i - 1); | |
125 | local_irq_enable(); | |
126 | } | |
127 | ||
1da177e4 LT |
128 | /* bio's attached to a stripe+device for I/O are linked together in bi_sector |
129 | * order without overlap. There may be several bio's per stripe+device, and | |
130 | * a bio could span several devices. | |
131 | * When walking this list for a particular stripe+device, we must never proceed | |
132 | * beyond a bio that extends past this device, as the next bio might no longer | |
133 | * be valid. | |
db298e19 | 134 | * This function is used to determine the 'next' bio in the list, given the sector |
1da177e4 LT |
135 | * of the current stripe+device |
136 | */ | |
db298e19 N |
137 | static inline struct bio *r5_next_bio(struct bio *bio, sector_t sector) |
138 | { | |
aa8b57aa | 139 | int sectors = bio_sectors(bio); |
4f024f37 | 140 | if (bio->bi_iter.bi_sector + sectors < sector + STRIPE_SECTORS) |
db298e19 N |
141 | return bio->bi_next; |
142 | else | |
143 | return NULL; | |
144 | } | |
1da177e4 | 145 | |
960e739d | 146 | /* |
5b99c2ff JA |
147 | * We maintain a biased count of active stripes in the bottom 16 bits of |
148 | * bi_phys_segments, and a count of processed stripes in the upper 16 bits | |
960e739d | 149 | */ |
e7836bd6 | 150 | static inline int raid5_bi_processed_stripes(struct bio *bio) |
960e739d | 151 | { |
e7836bd6 SL |
152 | atomic_t *segments = (atomic_t *)&bio->bi_phys_segments; |
153 | return (atomic_read(segments) >> 16) & 0xffff; | |
960e739d JA |
154 | } |
155 | ||
e7836bd6 | 156 | static inline int raid5_dec_bi_active_stripes(struct bio *bio) |
960e739d | 157 | { |
e7836bd6 SL |
158 | atomic_t *segments = (atomic_t *)&bio->bi_phys_segments; |
159 | return atomic_sub_return(1, segments) & 0xffff; | |
960e739d JA |
160 | } |
161 | ||
e7836bd6 | 162 | static inline void raid5_inc_bi_active_stripes(struct bio *bio) |
960e739d | 163 | { |
e7836bd6 SL |
164 | atomic_t *segments = (atomic_t *)&bio->bi_phys_segments; |
165 | atomic_inc(segments); | |
960e739d JA |
166 | } |
167 | ||
e7836bd6 SL |
168 | static inline void raid5_set_bi_processed_stripes(struct bio *bio, |
169 | unsigned int cnt) | |
960e739d | 170 | { |
e7836bd6 SL |
171 | atomic_t *segments = (atomic_t *)&bio->bi_phys_segments; |
172 | int old, new; | |
960e739d | 173 | |
e7836bd6 SL |
174 | do { |
175 | old = atomic_read(segments); | |
176 | new = (old & 0xffff) | (cnt << 16); | |
177 | } while (atomic_cmpxchg(segments, old, new) != old); | |
960e739d JA |
178 | } |
179 | ||
e7836bd6 | 180 | static inline void raid5_set_bi_stripes(struct bio *bio, unsigned int cnt) |
960e739d | 181 | { |
e7836bd6 SL |
182 | atomic_t *segments = (atomic_t *)&bio->bi_phys_segments; |
183 | atomic_set(segments, cnt); | |
960e739d JA |
184 | } |
185 | ||
d0dabf7e N |
186 | /* Find first data disk in a raid6 stripe */ |
187 | static inline int raid6_d0(struct stripe_head *sh) | |
188 | { | |
67cc2b81 N |
189 | if (sh->ddf_layout) |
190 | /* ddf always start from first device */ | |
191 | return 0; | |
192 | /* md starts just after Q block */ | |
d0dabf7e N |
193 | if (sh->qd_idx == sh->disks - 1) |
194 | return 0; | |
195 | else | |
196 | return sh->qd_idx + 1; | |
197 | } | |
16a53ecc N |
198 | static inline int raid6_next_disk(int disk, int raid_disks) |
199 | { | |
200 | disk++; | |
201 | return (disk < raid_disks) ? disk : 0; | |
202 | } | |
a4456856 | 203 | |
d0dabf7e N |
204 | /* When walking through the disks in a raid5, starting at raid6_d0, |
205 | * We need to map each disk to a 'slot', where the data disks are slot | |
206 | * 0 .. raid_disks-3, the parity disk is raid_disks-2 and the Q disk | |
207 | * is raid_disks-1. This help does that mapping. | |
208 | */ | |
67cc2b81 N |
209 | static int raid6_idx_to_slot(int idx, struct stripe_head *sh, |
210 | int *count, int syndrome_disks) | |
d0dabf7e | 211 | { |
6629542e | 212 | int slot = *count; |
67cc2b81 | 213 | |
e4424fee | 214 | if (sh->ddf_layout) |
6629542e | 215 | (*count)++; |
d0dabf7e | 216 | if (idx == sh->pd_idx) |
67cc2b81 | 217 | return syndrome_disks; |
d0dabf7e | 218 | if (idx == sh->qd_idx) |
67cc2b81 | 219 | return syndrome_disks + 1; |
e4424fee | 220 | if (!sh->ddf_layout) |
6629542e | 221 | (*count)++; |
d0dabf7e N |
222 | return slot; |
223 | } | |
224 | ||
a4456856 DW |
225 | static void return_io(struct bio *return_bi) |
226 | { | |
227 | struct bio *bi = return_bi; | |
228 | while (bi) { | |
a4456856 DW |
229 | |
230 | return_bi = bi->bi_next; | |
231 | bi->bi_next = NULL; | |
4f024f37 | 232 | bi->bi_iter.bi_size = 0; |
0a82a8d1 LT |
233 | trace_block_bio_complete(bdev_get_queue(bi->bi_bdev), |
234 | bi, 0); | |
0e13fe23 | 235 | bio_endio(bi, 0); |
a4456856 DW |
236 | bi = return_bi; |
237 | } | |
238 | } | |
239 | ||
d1688a6d | 240 | static void print_raid5_conf (struct r5conf *conf); |
1da177e4 | 241 | |
600aa109 DW |
242 | static int stripe_operations_active(struct stripe_head *sh) |
243 | { | |
244 | return sh->check_state || sh->reconstruct_state || | |
245 | test_bit(STRIPE_BIOFILL_RUN, &sh->state) || | |
246 | test_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
247 | } | |
248 | ||
851c30c9 SL |
249 | static void raid5_wakeup_stripe_thread(struct stripe_head *sh) |
250 | { | |
251 | struct r5conf *conf = sh->raid_conf; | |
252 | struct r5worker_group *group; | |
bfc90cb0 | 253 | int thread_cnt; |
851c30c9 SL |
254 | int i, cpu = sh->cpu; |
255 | ||
256 | if (!cpu_online(cpu)) { | |
257 | cpu = cpumask_any(cpu_online_mask); | |
258 | sh->cpu = cpu; | |
259 | } | |
260 | ||
261 | if (list_empty(&sh->lru)) { | |
262 | struct r5worker_group *group; | |
263 | group = conf->worker_groups + cpu_to_group(cpu); | |
264 | list_add_tail(&sh->lru, &group->handle_list); | |
bfc90cb0 SL |
265 | group->stripes_cnt++; |
266 | sh->group = group; | |
851c30c9 SL |
267 | } |
268 | ||
269 | if (conf->worker_cnt_per_group == 0) { | |
270 | md_wakeup_thread(conf->mddev->thread); | |
271 | return; | |
272 | } | |
273 | ||
274 | group = conf->worker_groups + cpu_to_group(sh->cpu); | |
275 | ||
bfc90cb0 SL |
276 | group->workers[0].working = true; |
277 | /* at least one worker should run to avoid race */ | |
278 | queue_work_on(sh->cpu, raid5_wq, &group->workers[0].work); | |
279 | ||
280 | thread_cnt = group->stripes_cnt / MAX_STRIPE_BATCH - 1; | |
281 | /* wakeup more workers */ | |
282 | for (i = 1; i < conf->worker_cnt_per_group && thread_cnt > 0; i++) { | |
283 | if (group->workers[i].working == false) { | |
284 | group->workers[i].working = true; | |
285 | queue_work_on(sh->cpu, raid5_wq, | |
286 | &group->workers[i].work); | |
287 | thread_cnt--; | |
288 | } | |
289 | } | |
851c30c9 SL |
290 | } |
291 | ||
566c09c5 SL |
292 | static void do_release_stripe(struct r5conf *conf, struct stripe_head *sh, |
293 | struct list_head *temp_inactive_list) | |
1da177e4 | 294 | { |
4eb788df SL |
295 | BUG_ON(!list_empty(&sh->lru)); |
296 | BUG_ON(atomic_read(&conf->active_stripes)==0); | |
297 | if (test_bit(STRIPE_HANDLE, &sh->state)) { | |
298 | if (test_bit(STRIPE_DELAYED, &sh->state) && | |
67f45548 | 299 | !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { |
4eb788df | 300 | list_add_tail(&sh->lru, &conf->delayed_list); |
67f45548 N |
301 | if (atomic_read(&conf->preread_active_stripes) |
302 | < IO_THRESHOLD) | |
303 | md_wakeup_thread(conf->mddev->thread); | |
304 | } else if (test_bit(STRIPE_BIT_DELAY, &sh->state) && | |
4eb788df SL |
305 | sh->bm_seq - conf->seq_write > 0) |
306 | list_add_tail(&sh->lru, &conf->bitmap_list); | |
307 | else { | |
308 | clear_bit(STRIPE_DELAYED, &sh->state); | |
309 | clear_bit(STRIPE_BIT_DELAY, &sh->state); | |
851c30c9 SL |
310 | if (conf->worker_cnt_per_group == 0) { |
311 | list_add_tail(&sh->lru, &conf->handle_list); | |
312 | } else { | |
313 | raid5_wakeup_stripe_thread(sh); | |
314 | return; | |
315 | } | |
4eb788df SL |
316 | } |
317 | md_wakeup_thread(conf->mddev->thread); | |
318 | } else { | |
319 | BUG_ON(stripe_operations_active(sh)); | |
320 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
321 | if (atomic_dec_return(&conf->preread_active_stripes) | |
322 | < IO_THRESHOLD) | |
323 | md_wakeup_thread(conf->mddev->thread); | |
324 | atomic_dec(&conf->active_stripes); | |
566c09c5 SL |
325 | if (!test_bit(STRIPE_EXPANDING, &sh->state)) |
326 | list_add_tail(&sh->lru, temp_inactive_list); | |
1da177e4 LT |
327 | } |
328 | } | |
d0dabf7e | 329 | |
566c09c5 SL |
330 | static void __release_stripe(struct r5conf *conf, struct stripe_head *sh, |
331 | struct list_head *temp_inactive_list) | |
4eb788df SL |
332 | { |
333 | if (atomic_dec_and_test(&sh->count)) | |
566c09c5 SL |
334 | do_release_stripe(conf, sh, temp_inactive_list); |
335 | } | |
336 | ||
337 | /* | |
338 | * @hash could be NR_STRIPE_HASH_LOCKS, then we have a list of inactive_list | |
339 | * | |
340 | * Be careful: Only one task can add/delete stripes from temp_inactive_list at | |
341 | * given time. Adding stripes only takes device lock, while deleting stripes | |
342 | * only takes hash lock. | |
343 | */ | |
344 | static void release_inactive_stripe_list(struct r5conf *conf, | |
345 | struct list_head *temp_inactive_list, | |
346 | int hash) | |
347 | { | |
348 | int size; | |
349 | bool do_wakeup = false; | |
350 | unsigned long flags; | |
351 | ||
352 | if (hash == NR_STRIPE_HASH_LOCKS) { | |
353 | size = NR_STRIPE_HASH_LOCKS; | |
354 | hash = NR_STRIPE_HASH_LOCKS - 1; | |
355 | } else | |
356 | size = 1; | |
357 | while (size) { | |
358 | struct list_head *list = &temp_inactive_list[size - 1]; | |
359 | ||
360 | /* | |
361 | * We don't hold any lock here yet, get_active_stripe() might | |
362 | * remove stripes from the list | |
363 | */ | |
364 | if (!list_empty_careful(list)) { | |
365 | spin_lock_irqsave(conf->hash_locks + hash, flags); | |
4bda556a SL |
366 | if (list_empty(conf->inactive_list + hash) && |
367 | !list_empty(list)) | |
368 | atomic_dec(&conf->empty_inactive_list_nr); | |
566c09c5 SL |
369 | list_splice_tail_init(list, conf->inactive_list + hash); |
370 | do_wakeup = true; | |
371 | spin_unlock_irqrestore(conf->hash_locks + hash, flags); | |
372 | } | |
373 | size--; | |
374 | hash--; | |
375 | } | |
376 | ||
377 | if (do_wakeup) { | |
378 | wake_up(&conf->wait_for_stripe); | |
379 | if (conf->retry_read_aligned) | |
380 | md_wakeup_thread(conf->mddev->thread); | |
381 | } | |
4eb788df SL |
382 | } |
383 | ||
773ca82f | 384 | /* should hold conf->device_lock already */ |
566c09c5 SL |
385 | static int release_stripe_list(struct r5conf *conf, |
386 | struct list_head *temp_inactive_list) | |
773ca82f SL |
387 | { |
388 | struct stripe_head *sh; | |
389 | int count = 0; | |
390 | struct llist_node *head; | |
391 | ||
392 | head = llist_del_all(&conf->released_stripes); | |
d265d9dc | 393 | head = llist_reverse_order(head); |
773ca82f | 394 | while (head) { |
566c09c5 SL |
395 | int hash; |
396 | ||
773ca82f SL |
397 | sh = llist_entry(head, struct stripe_head, release_list); |
398 | head = llist_next(head); | |
399 | /* sh could be readded after STRIPE_ON_RELEASE_LIST is cleard */ | |
400 | smp_mb(); | |
401 | clear_bit(STRIPE_ON_RELEASE_LIST, &sh->state); | |
402 | /* | |
403 | * Don't worry the bit is set here, because if the bit is set | |
404 | * again, the count is always > 1. This is true for | |
405 | * STRIPE_ON_UNPLUG_LIST bit too. | |
406 | */ | |
566c09c5 SL |
407 | hash = sh->hash_lock_index; |
408 | __release_stripe(conf, sh, &temp_inactive_list[hash]); | |
773ca82f SL |
409 | count++; |
410 | } | |
411 | ||
412 | return count; | |
413 | } | |
414 | ||
1da177e4 LT |
415 | static void release_stripe(struct stripe_head *sh) |
416 | { | |
d1688a6d | 417 | struct r5conf *conf = sh->raid_conf; |
1da177e4 | 418 | unsigned long flags; |
566c09c5 SL |
419 | struct list_head list; |
420 | int hash; | |
773ca82f | 421 | bool wakeup; |
16a53ecc | 422 | |
cf170f3f ES |
423 | /* Avoid release_list until the last reference. |
424 | */ | |
425 | if (atomic_add_unless(&sh->count, -1, 1)) | |
426 | return; | |
427 | ||
ad4068de | 428 | if (unlikely(!conf->mddev->thread) || |
429 | test_and_set_bit(STRIPE_ON_RELEASE_LIST, &sh->state)) | |
773ca82f SL |
430 | goto slow_path; |
431 | wakeup = llist_add(&sh->release_list, &conf->released_stripes); | |
432 | if (wakeup) | |
433 | md_wakeup_thread(conf->mddev->thread); | |
434 | return; | |
435 | slow_path: | |
4eb788df | 436 | local_irq_save(flags); |
773ca82f | 437 | /* we are ok here if STRIPE_ON_RELEASE_LIST is set or not */ |
4eb788df | 438 | if (atomic_dec_and_lock(&sh->count, &conf->device_lock)) { |
566c09c5 SL |
439 | INIT_LIST_HEAD(&list); |
440 | hash = sh->hash_lock_index; | |
441 | do_release_stripe(conf, sh, &list); | |
4eb788df | 442 | spin_unlock(&conf->device_lock); |
566c09c5 | 443 | release_inactive_stripe_list(conf, &list, hash); |
4eb788df SL |
444 | } |
445 | local_irq_restore(flags); | |
1da177e4 LT |
446 | } |
447 | ||
fccddba0 | 448 | static inline void remove_hash(struct stripe_head *sh) |
1da177e4 | 449 | { |
45b4233c DW |
450 | pr_debug("remove_hash(), stripe %llu\n", |
451 | (unsigned long long)sh->sector); | |
1da177e4 | 452 | |
fccddba0 | 453 | hlist_del_init(&sh->hash); |
1da177e4 LT |
454 | } |
455 | ||
d1688a6d | 456 | static inline void insert_hash(struct r5conf *conf, struct stripe_head *sh) |
1da177e4 | 457 | { |
fccddba0 | 458 | struct hlist_head *hp = stripe_hash(conf, sh->sector); |
1da177e4 | 459 | |
45b4233c DW |
460 | pr_debug("insert_hash(), stripe %llu\n", |
461 | (unsigned long long)sh->sector); | |
1da177e4 | 462 | |
fccddba0 | 463 | hlist_add_head(&sh->hash, hp); |
1da177e4 LT |
464 | } |
465 | ||
1da177e4 | 466 | /* find an idle stripe, make sure it is unhashed, and return it. */ |
566c09c5 | 467 | static struct stripe_head *get_free_stripe(struct r5conf *conf, int hash) |
1da177e4 LT |
468 | { |
469 | struct stripe_head *sh = NULL; | |
470 | struct list_head *first; | |
471 | ||
566c09c5 | 472 | if (list_empty(conf->inactive_list + hash)) |
1da177e4 | 473 | goto out; |
566c09c5 | 474 | first = (conf->inactive_list + hash)->next; |
1da177e4 LT |
475 | sh = list_entry(first, struct stripe_head, lru); |
476 | list_del_init(first); | |
477 | remove_hash(sh); | |
478 | atomic_inc(&conf->active_stripes); | |
566c09c5 | 479 | BUG_ON(hash != sh->hash_lock_index); |
4bda556a SL |
480 | if (list_empty(conf->inactive_list + hash)) |
481 | atomic_inc(&conf->empty_inactive_list_nr); | |
1da177e4 LT |
482 | out: |
483 | return sh; | |
484 | } | |
485 | ||
e4e11e38 | 486 | static void shrink_buffers(struct stripe_head *sh) |
1da177e4 LT |
487 | { |
488 | struct page *p; | |
489 | int i; | |
e4e11e38 | 490 | int num = sh->raid_conf->pool_size; |
1da177e4 | 491 | |
e4e11e38 | 492 | for (i = 0; i < num ; i++) { |
d592a996 | 493 | WARN_ON(sh->dev[i].page != sh->dev[i].orig_page); |
1da177e4 LT |
494 | p = sh->dev[i].page; |
495 | if (!p) | |
496 | continue; | |
497 | sh->dev[i].page = NULL; | |
2d1f3b5d | 498 | put_page(p); |
1da177e4 LT |
499 | } |
500 | } | |
501 | ||
e4e11e38 | 502 | static int grow_buffers(struct stripe_head *sh) |
1da177e4 LT |
503 | { |
504 | int i; | |
e4e11e38 | 505 | int num = sh->raid_conf->pool_size; |
1da177e4 | 506 | |
e4e11e38 | 507 | for (i = 0; i < num; i++) { |
1da177e4 LT |
508 | struct page *page; |
509 | ||
510 | if (!(page = alloc_page(GFP_KERNEL))) { | |
511 | return 1; | |
512 | } | |
513 | sh->dev[i].page = page; | |
d592a996 | 514 | sh->dev[i].orig_page = page; |
1da177e4 LT |
515 | } |
516 | return 0; | |
517 | } | |
518 | ||
784052ec | 519 | static void raid5_build_block(struct stripe_head *sh, int i, int previous); |
d1688a6d | 520 | static void stripe_set_idx(sector_t stripe, struct r5conf *conf, int previous, |
911d4ee8 | 521 | struct stripe_head *sh); |
1da177e4 | 522 | |
b5663ba4 | 523 | static void init_stripe(struct stripe_head *sh, sector_t sector, int previous) |
1da177e4 | 524 | { |
d1688a6d | 525 | struct r5conf *conf = sh->raid_conf; |
566c09c5 | 526 | int i, seq; |
1da177e4 | 527 | |
78bafebd ES |
528 | BUG_ON(atomic_read(&sh->count) != 0); |
529 | BUG_ON(test_bit(STRIPE_HANDLE, &sh->state)); | |
600aa109 | 530 | BUG_ON(stripe_operations_active(sh)); |
d84e0f10 | 531 | |
45b4233c | 532 | pr_debug("init_stripe called, stripe %llu\n", |
b8e6a15a | 533 | (unsigned long long)sector); |
566c09c5 SL |
534 | retry: |
535 | seq = read_seqcount_begin(&conf->gen_lock); | |
86b42c71 | 536 | sh->generation = conf->generation - previous; |
b5663ba4 | 537 | sh->disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
1da177e4 | 538 | sh->sector = sector; |
911d4ee8 | 539 | stripe_set_idx(sector, conf, previous, sh); |
1da177e4 LT |
540 | sh->state = 0; |
541 | ||
7ecaa1e6 | 542 | for (i = sh->disks; i--; ) { |
1da177e4 LT |
543 | struct r5dev *dev = &sh->dev[i]; |
544 | ||
d84e0f10 | 545 | if (dev->toread || dev->read || dev->towrite || dev->written || |
1da177e4 | 546 | test_bit(R5_LOCKED, &dev->flags)) { |
d84e0f10 | 547 | printk(KERN_ERR "sector=%llx i=%d %p %p %p %p %d\n", |
1da177e4 | 548 | (unsigned long long)sh->sector, i, dev->toread, |
d84e0f10 | 549 | dev->read, dev->towrite, dev->written, |
1da177e4 | 550 | test_bit(R5_LOCKED, &dev->flags)); |
8cfa7b0f | 551 | WARN_ON(1); |
1da177e4 LT |
552 | } |
553 | dev->flags = 0; | |
784052ec | 554 | raid5_build_block(sh, i, previous); |
1da177e4 | 555 | } |
566c09c5 SL |
556 | if (read_seqcount_retry(&conf->gen_lock, seq)) |
557 | goto retry; | |
1da177e4 | 558 | insert_hash(conf, sh); |
851c30c9 | 559 | sh->cpu = smp_processor_id(); |
1da177e4 LT |
560 | } |
561 | ||
d1688a6d | 562 | static struct stripe_head *__find_stripe(struct r5conf *conf, sector_t sector, |
86b42c71 | 563 | short generation) |
1da177e4 LT |
564 | { |
565 | struct stripe_head *sh; | |
566 | ||
45b4233c | 567 | pr_debug("__find_stripe, sector %llu\n", (unsigned long long)sector); |
b67bfe0d | 568 | hlist_for_each_entry(sh, stripe_hash(conf, sector), hash) |
86b42c71 | 569 | if (sh->sector == sector && sh->generation == generation) |
1da177e4 | 570 | return sh; |
45b4233c | 571 | pr_debug("__stripe %llu not in cache\n", (unsigned long long)sector); |
1da177e4 LT |
572 | return NULL; |
573 | } | |
574 | ||
674806d6 N |
575 | /* |
576 | * Need to check if array has failed when deciding whether to: | |
577 | * - start an array | |
578 | * - remove non-faulty devices | |
579 | * - add a spare | |
580 | * - allow a reshape | |
581 | * This determination is simple when no reshape is happening. | |
582 | * However if there is a reshape, we need to carefully check | |
583 | * both the before and after sections. | |
584 | * This is because some failed devices may only affect one | |
585 | * of the two sections, and some non-in_sync devices may | |
586 | * be insync in the section most affected by failed devices. | |
587 | */ | |
908f4fbd | 588 | static int calc_degraded(struct r5conf *conf) |
674806d6 | 589 | { |
908f4fbd | 590 | int degraded, degraded2; |
674806d6 | 591 | int i; |
674806d6 N |
592 | |
593 | rcu_read_lock(); | |
594 | degraded = 0; | |
595 | for (i = 0; i < conf->previous_raid_disks; i++) { | |
3cb03002 | 596 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
e5c86471 N |
597 | if (rdev && test_bit(Faulty, &rdev->flags)) |
598 | rdev = rcu_dereference(conf->disks[i].replacement); | |
674806d6 N |
599 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
600 | degraded++; | |
601 | else if (test_bit(In_sync, &rdev->flags)) | |
602 | ; | |
603 | else | |
604 | /* not in-sync or faulty. | |
605 | * If the reshape increases the number of devices, | |
606 | * this is being recovered by the reshape, so | |
607 | * this 'previous' section is not in_sync. | |
608 | * If the number of devices is being reduced however, | |
609 | * the device can only be part of the array if | |
610 | * we are reverting a reshape, so this section will | |
611 | * be in-sync. | |
612 | */ | |
613 | if (conf->raid_disks >= conf->previous_raid_disks) | |
614 | degraded++; | |
615 | } | |
616 | rcu_read_unlock(); | |
908f4fbd N |
617 | if (conf->raid_disks == conf->previous_raid_disks) |
618 | return degraded; | |
674806d6 | 619 | rcu_read_lock(); |
908f4fbd | 620 | degraded2 = 0; |
674806d6 | 621 | for (i = 0; i < conf->raid_disks; i++) { |
3cb03002 | 622 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
e5c86471 N |
623 | if (rdev && test_bit(Faulty, &rdev->flags)) |
624 | rdev = rcu_dereference(conf->disks[i].replacement); | |
674806d6 | 625 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
908f4fbd | 626 | degraded2++; |
674806d6 N |
627 | else if (test_bit(In_sync, &rdev->flags)) |
628 | ; | |
629 | else | |
630 | /* not in-sync or faulty. | |
631 | * If reshape increases the number of devices, this | |
632 | * section has already been recovered, else it | |
633 | * almost certainly hasn't. | |
634 | */ | |
635 | if (conf->raid_disks <= conf->previous_raid_disks) | |
908f4fbd | 636 | degraded2++; |
674806d6 N |
637 | } |
638 | rcu_read_unlock(); | |
908f4fbd N |
639 | if (degraded2 > degraded) |
640 | return degraded2; | |
641 | return degraded; | |
642 | } | |
643 | ||
644 | static int has_failed(struct r5conf *conf) | |
645 | { | |
646 | int degraded; | |
647 | ||
648 | if (conf->mddev->reshape_position == MaxSector) | |
649 | return conf->mddev->degraded > conf->max_degraded; | |
650 | ||
651 | degraded = calc_degraded(conf); | |
674806d6 N |
652 | if (degraded > conf->max_degraded) |
653 | return 1; | |
654 | return 0; | |
655 | } | |
656 | ||
b5663ba4 | 657 | static struct stripe_head * |
d1688a6d | 658 | get_active_stripe(struct r5conf *conf, sector_t sector, |
a8c906ca | 659 | int previous, int noblock, int noquiesce) |
1da177e4 LT |
660 | { |
661 | struct stripe_head *sh; | |
566c09c5 | 662 | int hash = stripe_hash_locks_hash(sector); |
1da177e4 | 663 | |
45b4233c | 664 | pr_debug("get_stripe, sector %llu\n", (unsigned long long)sector); |
1da177e4 | 665 | |
566c09c5 | 666 | spin_lock_irq(conf->hash_locks + hash); |
1da177e4 LT |
667 | |
668 | do { | |
72626685 | 669 | wait_event_lock_irq(conf->wait_for_stripe, |
a8c906ca | 670 | conf->quiesce == 0 || noquiesce, |
566c09c5 | 671 | *(conf->hash_locks + hash)); |
86b42c71 | 672 | sh = __find_stripe(conf, sector, conf->generation - previous); |
1da177e4 LT |
673 | if (!sh) { |
674 | if (!conf->inactive_blocked) | |
566c09c5 | 675 | sh = get_free_stripe(conf, hash); |
1da177e4 LT |
676 | if (noblock && sh == NULL) |
677 | break; | |
678 | if (!sh) { | |
679 | conf->inactive_blocked = 1; | |
566c09c5 SL |
680 | wait_event_lock_irq( |
681 | conf->wait_for_stripe, | |
682 | !list_empty(conf->inactive_list + hash) && | |
683 | (atomic_read(&conf->active_stripes) | |
684 | < (conf->max_nr_stripes * 3 / 4) | |
685 | || !conf->inactive_blocked), | |
686 | *(conf->hash_locks + hash)); | |
1da177e4 | 687 | conf->inactive_blocked = 0; |
7da9d450 | 688 | } else { |
b5663ba4 | 689 | init_stripe(sh, sector, previous); |
7da9d450 N |
690 | atomic_inc(&sh->count); |
691 | } | |
e240c183 | 692 | } else if (!atomic_inc_not_zero(&sh->count)) { |
6d183de4 | 693 | spin_lock(&conf->device_lock); |
e240c183 | 694 | if (!atomic_read(&sh->count)) { |
1da177e4 LT |
695 | if (!test_bit(STRIPE_HANDLE, &sh->state)) |
696 | atomic_inc(&conf->active_stripes); | |
5af9bef7 N |
697 | BUG_ON(list_empty(&sh->lru) && |
698 | !test_bit(STRIPE_EXPANDING, &sh->state)); | |
16a53ecc | 699 | list_del_init(&sh->lru); |
bfc90cb0 SL |
700 | if (sh->group) { |
701 | sh->group->stripes_cnt--; | |
702 | sh->group = NULL; | |
703 | } | |
1da177e4 | 704 | } |
7da9d450 | 705 | atomic_inc(&sh->count); |
6d183de4 | 706 | spin_unlock(&conf->device_lock); |
1da177e4 LT |
707 | } |
708 | } while (sh == NULL); | |
709 | ||
566c09c5 | 710 | spin_unlock_irq(conf->hash_locks + hash); |
1da177e4 LT |
711 | return sh; |
712 | } | |
713 | ||
05616be5 N |
714 | /* Determine if 'data_offset' or 'new_data_offset' should be used |
715 | * in this stripe_head. | |
716 | */ | |
717 | static int use_new_offset(struct r5conf *conf, struct stripe_head *sh) | |
718 | { | |
719 | sector_t progress = conf->reshape_progress; | |
720 | /* Need a memory barrier to make sure we see the value | |
721 | * of conf->generation, or ->data_offset that was set before | |
722 | * reshape_progress was updated. | |
723 | */ | |
724 | smp_rmb(); | |
725 | if (progress == MaxSector) | |
726 | return 0; | |
727 | if (sh->generation == conf->generation - 1) | |
728 | return 0; | |
729 | /* We are in a reshape, and this is a new-generation stripe, | |
730 | * so use new_data_offset. | |
731 | */ | |
732 | return 1; | |
733 | } | |
734 | ||
6712ecf8 N |
735 | static void |
736 | raid5_end_read_request(struct bio *bi, int error); | |
737 | static void | |
738 | raid5_end_write_request(struct bio *bi, int error); | |
91c00924 | 739 | |
c4e5ac0a | 740 | static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s) |
91c00924 | 741 | { |
d1688a6d | 742 | struct r5conf *conf = sh->raid_conf; |
91c00924 DW |
743 | int i, disks = sh->disks; |
744 | ||
745 | might_sleep(); | |
746 | ||
747 | for (i = disks; i--; ) { | |
748 | int rw; | |
9a3e1101 | 749 | int replace_only = 0; |
977df362 N |
750 | struct bio *bi, *rbi; |
751 | struct md_rdev *rdev, *rrdev = NULL; | |
e9c7469b TH |
752 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) { |
753 | if (test_and_clear_bit(R5_WantFUA, &sh->dev[i].flags)) | |
754 | rw = WRITE_FUA; | |
755 | else | |
756 | rw = WRITE; | |
9e444768 | 757 | if (test_bit(R5_Discard, &sh->dev[i].flags)) |
620125f2 | 758 | rw |= REQ_DISCARD; |
e9c7469b | 759 | } else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags)) |
91c00924 | 760 | rw = READ; |
9a3e1101 N |
761 | else if (test_and_clear_bit(R5_WantReplace, |
762 | &sh->dev[i].flags)) { | |
763 | rw = WRITE; | |
764 | replace_only = 1; | |
765 | } else | |
91c00924 | 766 | continue; |
bc0934f0 SL |
767 | if (test_and_clear_bit(R5_SyncIO, &sh->dev[i].flags)) |
768 | rw |= REQ_SYNC; | |
91c00924 DW |
769 | |
770 | bi = &sh->dev[i].req; | |
977df362 | 771 | rbi = &sh->dev[i].rreq; /* For writing to replacement */ |
91c00924 | 772 | |
91c00924 | 773 | rcu_read_lock(); |
9a3e1101 | 774 | rrdev = rcu_dereference(conf->disks[i].replacement); |
dd054fce N |
775 | smp_mb(); /* Ensure that if rrdev is NULL, rdev won't be */ |
776 | rdev = rcu_dereference(conf->disks[i].rdev); | |
777 | if (!rdev) { | |
778 | rdev = rrdev; | |
779 | rrdev = NULL; | |
780 | } | |
9a3e1101 N |
781 | if (rw & WRITE) { |
782 | if (replace_only) | |
783 | rdev = NULL; | |
dd054fce N |
784 | if (rdev == rrdev) |
785 | /* We raced and saw duplicates */ | |
786 | rrdev = NULL; | |
9a3e1101 | 787 | } else { |
dd054fce | 788 | if (test_bit(R5_ReadRepl, &sh->dev[i].flags) && rrdev) |
9a3e1101 N |
789 | rdev = rrdev; |
790 | rrdev = NULL; | |
791 | } | |
977df362 | 792 | |
91c00924 DW |
793 | if (rdev && test_bit(Faulty, &rdev->flags)) |
794 | rdev = NULL; | |
795 | if (rdev) | |
796 | atomic_inc(&rdev->nr_pending); | |
977df362 N |
797 | if (rrdev && test_bit(Faulty, &rrdev->flags)) |
798 | rrdev = NULL; | |
799 | if (rrdev) | |
800 | atomic_inc(&rrdev->nr_pending); | |
91c00924 DW |
801 | rcu_read_unlock(); |
802 | ||
73e92e51 | 803 | /* We have already checked bad blocks for reads. Now |
977df362 N |
804 | * need to check for writes. We never accept write errors |
805 | * on the replacement, so we don't to check rrdev. | |
73e92e51 N |
806 | */ |
807 | while ((rw & WRITE) && rdev && | |
808 | test_bit(WriteErrorSeen, &rdev->flags)) { | |
809 | sector_t first_bad; | |
810 | int bad_sectors; | |
811 | int bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
812 | &first_bad, &bad_sectors); | |
813 | if (!bad) | |
814 | break; | |
815 | ||
816 | if (bad < 0) { | |
817 | set_bit(BlockedBadBlocks, &rdev->flags); | |
818 | if (!conf->mddev->external && | |
819 | conf->mddev->flags) { | |
820 | /* It is very unlikely, but we might | |
821 | * still need to write out the | |
822 | * bad block log - better give it | |
823 | * a chance*/ | |
824 | md_check_recovery(conf->mddev); | |
825 | } | |
1850753d | 826 | /* |
827 | * Because md_wait_for_blocked_rdev | |
828 | * will dec nr_pending, we must | |
829 | * increment it first. | |
830 | */ | |
831 | atomic_inc(&rdev->nr_pending); | |
73e92e51 N |
832 | md_wait_for_blocked_rdev(rdev, conf->mddev); |
833 | } else { | |
834 | /* Acknowledged bad block - skip the write */ | |
835 | rdev_dec_pending(rdev, conf->mddev); | |
836 | rdev = NULL; | |
837 | } | |
838 | } | |
839 | ||
91c00924 | 840 | if (rdev) { |
9a3e1101 N |
841 | if (s->syncing || s->expanding || s->expanded |
842 | || s->replacing) | |
91c00924 DW |
843 | md_sync_acct(rdev->bdev, STRIPE_SECTORS); |
844 | ||
2b7497f0 DW |
845 | set_bit(STRIPE_IO_STARTED, &sh->state); |
846 | ||
2f6db2a7 | 847 | bio_reset(bi); |
91c00924 | 848 | bi->bi_bdev = rdev->bdev; |
2f6db2a7 KO |
849 | bi->bi_rw = rw; |
850 | bi->bi_end_io = (rw & WRITE) | |
851 | ? raid5_end_write_request | |
852 | : raid5_end_read_request; | |
853 | bi->bi_private = sh; | |
854 | ||
91c00924 | 855 | pr_debug("%s: for %llu schedule op %ld on disc %d\n", |
e46b272b | 856 | __func__, (unsigned long long)sh->sector, |
91c00924 DW |
857 | bi->bi_rw, i); |
858 | atomic_inc(&sh->count); | |
05616be5 | 859 | if (use_new_offset(conf, sh)) |
4f024f37 | 860 | bi->bi_iter.bi_sector = (sh->sector |
05616be5 N |
861 | + rdev->new_data_offset); |
862 | else | |
4f024f37 | 863 | bi->bi_iter.bi_sector = (sh->sector |
05616be5 | 864 | + rdev->data_offset); |
3f9e7c14 | 865 | if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) |
e59aa23f | 866 | bi->bi_rw |= REQ_NOMERGE; |
3f9e7c14 | 867 | |
d592a996 SL |
868 | if (test_bit(R5_SkipCopy, &sh->dev[i].flags)) |
869 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
870 | sh->dev[i].vec.bv_page = sh->dev[i].page; | |
4997b72e | 871 | bi->bi_vcnt = 1; |
91c00924 DW |
872 | bi->bi_io_vec[0].bv_len = STRIPE_SIZE; |
873 | bi->bi_io_vec[0].bv_offset = 0; | |
4f024f37 | 874 | bi->bi_iter.bi_size = STRIPE_SIZE; |
37c61ff3 SL |
875 | /* |
876 | * If this is discard request, set bi_vcnt 0. We don't | |
877 | * want to confuse SCSI because SCSI will replace payload | |
878 | */ | |
879 | if (rw & REQ_DISCARD) | |
880 | bi->bi_vcnt = 0; | |
977df362 N |
881 | if (rrdev) |
882 | set_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags); | |
e3620a3a JB |
883 | |
884 | if (conf->mddev->gendisk) | |
885 | trace_block_bio_remap(bdev_get_queue(bi->bi_bdev), | |
886 | bi, disk_devt(conf->mddev->gendisk), | |
887 | sh->dev[i].sector); | |
91c00924 | 888 | generic_make_request(bi); |
977df362 N |
889 | } |
890 | if (rrdev) { | |
9a3e1101 N |
891 | if (s->syncing || s->expanding || s->expanded |
892 | || s->replacing) | |
977df362 N |
893 | md_sync_acct(rrdev->bdev, STRIPE_SECTORS); |
894 | ||
895 | set_bit(STRIPE_IO_STARTED, &sh->state); | |
896 | ||
2f6db2a7 | 897 | bio_reset(rbi); |
977df362 | 898 | rbi->bi_bdev = rrdev->bdev; |
2f6db2a7 KO |
899 | rbi->bi_rw = rw; |
900 | BUG_ON(!(rw & WRITE)); | |
901 | rbi->bi_end_io = raid5_end_write_request; | |
902 | rbi->bi_private = sh; | |
903 | ||
977df362 N |
904 | pr_debug("%s: for %llu schedule op %ld on " |
905 | "replacement disc %d\n", | |
906 | __func__, (unsigned long long)sh->sector, | |
907 | rbi->bi_rw, i); | |
908 | atomic_inc(&sh->count); | |
05616be5 | 909 | if (use_new_offset(conf, sh)) |
4f024f37 | 910 | rbi->bi_iter.bi_sector = (sh->sector |
05616be5 N |
911 | + rrdev->new_data_offset); |
912 | else | |
4f024f37 | 913 | rbi->bi_iter.bi_sector = (sh->sector |
05616be5 | 914 | + rrdev->data_offset); |
d592a996 SL |
915 | if (test_bit(R5_SkipCopy, &sh->dev[i].flags)) |
916 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
917 | sh->dev[i].rvec.bv_page = sh->dev[i].page; | |
4997b72e | 918 | rbi->bi_vcnt = 1; |
977df362 N |
919 | rbi->bi_io_vec[0].bv_len = STRIPE_SIZE; |
920 | rbi->bi_io_vec[0].bv_offset = 0; | |
4f024f37 | 921 | rbi->bi_iter.bi_size = STRIPE_SIZE; |
37c61ff3 SL |
922 | /* |
923 | * If this is discard request, set bi_vcnt 0. We don't | |
924 | * want to confuse SCSI because SCSI will replace payload | |
925 | */ | |
926 | if (rw & REQ_DISCARD) | |
927 | rbi->bi_vcnt = 0; | |
e3620a3a JB |
928 | if (conf->mddev->gendisk) |
929 | trace_block_bio_remap(bdev_get_queue(rbi->bi_bdev), | |
930 | rbi, disk_devt(conf->mddev->gendisk), | |
931 | sh->dev[i].sector); | |
977df362 N |
932 | generic_make_request(rbi); |
933 | } | |
934 | if (!rdev && !rrdev) { | |
b062962e | 935 | if (rw & WRITE) |
91c00924 DW |
936 | set_bit(STRIPE_DEGRADED, &sh->state); |
937 | pr_debug("skip op %ld on disc %d for sector %llu\n", | |
938 | bi->bi_rw, i, (unsigned long long)sh->sector); | |
939 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
940 | set_bit(STRIPE_HANDLE, &sh->state); | |
941 | } | |
942 | } | |
943 | } | |
944 | ||
945 | static struct dma_async_tx_descriptor * | |
d592a996 SL |
946 | async_copy_data(int frombio, struct bio *bio, struct page **page, |
947 | sector_t sector, struct dma_async_tx_descriptor *tx, | |
948 | struct stripe_head *sh) | |
91c00924 | 949 | { |
7988613b KO |
950 | struct bio_vec bvl; |
951 | struct bvec_iter iter; | |
91c00924 | 952 | struct page *bio_page; |
91c00924 | 953 | int page_offset; |
a08abd8c | 954 | struct async_submit_ctl submit; |
0403e382 | 955 | enum async_tx_flags flags = 0; |
91c00924 | 956 | |
4f024f37 KO |
957 | if (bio->bi_iter.bi_sector >= sector) |
958 | page_offset = (signed)(bio->bi_iter.bi_sector - sector) * 512; | |
91c00924 | 959 | else |
4f024f37 | 960 | page_offset = (signed)(sector - bio->bi_iter.bi_sector) * -512; |
a08abd8c | 961 | |
0403e382 DW |
962 | if (frombio) |
963 | flags |= ASYNC_TX_FENCE; | |
964 | init_async_submit(&submit, flags, tx, NULL, NULL, NULL); | |
965 | ||
7988613b KO |
966 | bio_for_each_segment(bvl, bio, iter) { |
967 | int len = bvl.bv_len; | |
91c00924 DW |
968 | int clen; |
969 | int b_offset = 0; | |
970 | ||
971 | if (page_offset < 0) { | |
972 | b_offset = -page_offset; | |
973 | page_offset += b_offset; | |
974 | len -= b_offset; | |
975 | } | |
976 | ||
977 | if (len > 0 && page_offset + len > STRIPE_SIZE) | |
978 | clen = STRIPE_SIZE - page_offset; | |
979 | else | |
980 | clen = len; | |
981 | ||
982 | if (clen > 0) { | |
7988613b KO |
983 | b_offset += bvl.bv_offset; |
984 | bio_page = bvl.bv_page; | |
d592a996 SL |
985 | if (frombio) { |
986 | if (sh->raid_conf->skip_copy && | |
987 | b_offset == 0 && page_offset == 0 && | |
988 | clen == STRIPE_SIZE) | |
989 | *page = bio_page; | |
990 | else | |
991 | tx = async_memcpy(*page, bio_page, page_offset, | |
a08abd8c | 992 | b_offset, clen, &submit); |
d592a996 SL |
993 | } else |
994 | tx = async_memcpy(bio_page, *page, b_offset, | |
a08abd8c | 995 | page_offset, clen, &submit); |
91c00924 | 996 | } |
a08abd8c DW |
997 | /* chain the operations */ |
998 | submit.depend_tx = tx; | |
999 | ||
91c00924 DW |
1000 | if (clen < len) /* hit end of page */ |
1001 | break; | |
1002 | page_offset += len; | |
1003 | } | |
1004 | ||
1005 | return tx; | |
1006 | } | |
1007 | ||
1008 | static void ops_complete_biofill(void *stripe_head_ref) | |
1009 | { | |
1010 | struct stripe_head *sh = stripe_head_ref; | |
1011 | struct bio *return_bi = NULL; | |
e4d84909 | 1012 | int i; |
91c00924 | 1013 | |
e46b272b | 1014 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1015 | (unsigned long long)sh->sector); |
1016 | ||
1017 | /* clear completed biofills */ | |
1018 | for (i = sh->disks; i--; ) { | |
1019 | struct r5dev *dev = &sh->dev[i]; | |
91c00924 DW |
1020 | |
1021 | /* acknowledge completion of a biofill operation */ | |
e4d84909 DW |
1022 | /* and check if we need to reply to a read request, |
1023 | * new R5_Wantfill requests are held off until | |
83de75cc | 1024 | * !STRIPE_BIOFILL_RUN |
e4d84909 DW |
1025 | */ |
1026 | if (test_and_clear_bit(R5_Wantfill, &dev->flags)) { | |
91c00924 | 1027 | struct bio *rbi, *rbi2; |
91c00924 | 1028 | |
91c00924 DW |
1029 | BUG_ON(!dev->read); |
1030 | rbi = dev->read; | |
1031 | dev->read = NULL; | |
4f024f37 | 1032 | while (rbi && rbi->bi_iter.bi_sector < |
91c00924 DW |
1033 | dev->sector + STRIPE_SECTORS) { |
1034 | rbi2 = r5_next_bio(rbi, dev->sector); | |
e7836bd6 | 1035 | if (!raid5_dec_bi_active_stripes(rbi)) { |
91c00924 DW |
1036 | rbi->bi_next = return_bi; |
1037 | return_bi = rbi; | |
1038 | } | |
91c00924 DW |
1039 | rbi = rbi2; |
1040 | } | |
1041 | } | |
1042 | } | |
83de75cc | 1043 | clear_bit(STRIPE_BIOFILL_RUN, &sh->state); |
91c00924 DW |
1044 | |
1045 | return_io(return_bi); | |
1046 | ||
e4d84909 | 1047 | set_bit(STRIPE_HANDLE, &sh->state); |
91c00924 DW |
1048 | release_stripe(sh); |
1049 | } | |
1050 | ||
1051 | static void ops_run_biofill(struct stripe_head *sh) | |
1052 | { | |
1053 | struct dma_async_tx_descriptor *tx = NULL; | |
a08abd8c | 1054 | struct async_submit_ctl submit; |
91c00924 DW |
1055 | int i; |
1056 | ||
e46b272b | 1057 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1058 | (unsigned long long)sh->sector); |
1059 | ||
1060 | for (i = sh->disks; i--; ) { | |
1061 | struct r5dev *dev = &sh->dev[i]; | |
1062 | if (test_bit(R5_Wantfill, &dev->flags)) { | |
1063 | struct bio *rbi; | |
b17459c0 | 1064 | spin_lock_irq(&sh->stripe_lock); |
91c00924 DW |
1065 | dev->read = rbi = dev->toread; |
1066 | dev->toread = NULL; | |
b17459c0 | 1067 | spin_unlock_irq(&sh->stripe_lock); |
4f024f37 | 1068 | while (rbi && rbi->bi_iter.bi_sector < |
91c00924 | 1069 | dev->sector + STRIPE_SECTORS) { |
d592a996 SL |
1070 | tx = async_copy_data(0, rbi, &dev->page, |
1071 | dev->sector, tx, sh); | |
91c00924 DW |
1072 | rbi = r5_next_bio(rbi, dev->sector); |
1073 | } | |
1074 | } | |
1075 | } | |
1076 | ||
1077 | atomic_inc(&sh->count); | |
a08abd8c DW |
1078 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_biofill, sh, NULL); |
1079 | async_trigger_callback(&submit); | |
91c00924 DW |
1080 | } |
1081 | ||
4e7d2c0a | 1082 | static void mark_target_uptodate(struct stripe_head *sh, int target) |
91c00924 | 1083 | { |
4e7d2c0a | 1084 | struct r5dev *tgt; |
91c00924 | 1085 | |
4e7d2c0a DW |
1086 | if (target < 0) |
1087 | return; | |
91c00924 | 1088 | |
4e7d2c0a | 1089 | tgt = &sh->dev[target]; |
91c00924 DW |
1090 | set_bit(R5_UPTODATE, &tgt->flags); |
1091 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1092 | clear_bit(R5_Wantcompute, &tgt->flags); | |
4e7d2c0a DW |
1093 | } |
1094 | ||
ac6b53b6 | 1095 | static void ops_complete_compute(void *stripe_head_ref) |
91c00924 DW |
1096 | { |
1097 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 1098 | |
e46b272b | 1099 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1100 | (unsigned long long)sh->sector); |
1101 | ||
ac6b53b6 | 1102 | /* mark the computed target(s) as uptodate */ |
4e7d2c0a | 1103 | mark_target_uptodate(sh, sh->ops.target); |
ac6b53b6 | 1104 | mark_target_uptodate(sh, sh->ops.target2); |
4e7d2c0a | 1105 | |
ecc65c9b DW |
1106 | clear_bit(STRIPE_COMPUTE_RUN, &sh->state); |
1107 | if (sh->check_state == check_state_compute_run) | |
1108 | sh->check_state = check_state_compute_result; | |
91c00924 DW |
1109 | set_bit(STRIPE_HANDLE, &sh->state); |
1110 | release_stripe(sh); | |
1111 | } | |
1112 | ||
d6f38f31 DW |
1113 | /* return a pointer to the address conversion region of the scribble buffer */ |
1114 | static addr_conv_t *to_addr_conv(struct stripe_head *sh, | |
1115 | struct raid5_percpu *percpu) | |
1116 | { | |
1117 | return percpu->scribble + sizeof(struct page *) * (sh->disks + 2); | |
1118 | } | |
1119 | ||
1120 | static struct dma_async_tx_descriptor * | |
1121 | ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu) | |
91c00924 | 1122 | { |
91c00924 | 1123 | int disks = sh->disks; |
d6f38f31 | 1124 | struct page **xor_srcs = percpu->scribble; |
91c00924 DW |
1125 | int target = sh->ops.target; |
1126 | struct r5dev *tgt = &sh->dev[target]; | |
1127 | struct page *xor_dest = tgt->page; | |
1128 | int count = 0; | |
1129 | struct dma_async_tx_descriptor *tx; | |
a08abd8c | 1130 | struct async_submit_ctl submit; |
91c00924 DW |
1131 | int i; |
1132 | ||
1133 | pr_debug("%s: stripe %llu block: %d\n", | |
e46b272b | 1134 | __func__, (unsigned long long)sh->sector, target); |
91c00924 DW |
1135 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); |
1136 | ||
1137 | for (i = disks; i--; ) | |
1138 | if (i != target) | |
1139 | xor_srcs[count++] = sh->dev[i].page; | |
1140 | ||
1141 | atomic_inc(&sh->count); | |
1142 | ||
0403e382 | 1143 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, NULL, |
ac6b53b6 | 1144 | ops_complete_compute, sh, to_addr_conv(sh, percpu)); |
91c00924 | 1145 | if (unlikely(count == 1)) |
a08abd8c | 1146 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); |
91c00924 | 1147 | else |
a08abd8c | 1148 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); |
91c00924 | 1149 | |
91c00924 DW |
1150 | return tx; |
1151 | } | |
1152 | ||
ac6b53b6 DW |
1153 | /* set_syndrome_sources - populate source buffers for gen_syndrome |
1154 | * @srcs - (struct page *) array of size sh->disks | |
1155 | * @sh - stripe_head to parse | |
1156 | * | |
1157 | * Populates srcs in proper layout order for the stripe and returns the | |
1158 | * 'count' of sources to be used in a call to async_gen_syndrome. The P | |
1159 | * destination buffer is recorded in srcs[count] and the Q destination | |
1160 | * is recorded in srcs[count+1]]. | |
1161 | */ | |
1162 | static int set_syndrome_sources(struct page **srcs, struct stripe_head *sh) | |
1163 | { | |
1164 | int disks = sh->disks; | |
1165 | int syndrome_disks = sh->ddf_layout ? disks : (disks - 2); | |
1166 | int d0_idx = raid6_d0(sh); | |
1167 | int count; | |
1168 | int i; | |
1169 | ||
1170 | for (i = 0; i < disks; i++) | |
5dd33c9a | 1171 | srcs[i] = NULL; |
ac6b53b6 DW |
1172 | |
1173 | count = 0; | |
1174 | i = d0_idx; | |
1175 | do { | |
1176 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); | |
1177 | ||
1178 | srcs[slot] = sh->dev[i].page; | |
1179 | i = raid6_next_disk(i, disks); | |
1180 | } while (i != d0_idx); | |
ac6b53b6 | 1181 | |
e4424fee | 1182 | return syndrome_disks; |
ac6b53b6 DW |
1183 | } |
1184 | ||
1185 | static struct dma_async_tx_descriptor * | |
1186 | ops_run_compute6_1(struct stripe_head *sh, struct raid5_percpu *percpu) | |
1187 | { | |
1188 | int disks = sh->disks; | |
1189 | struct page **blocks = percpu->scribble; | |
1190 | int target; | |
1191 | int qd_idx = sh->qd_idx; | |
1192 | struct dma_async_tx_descriptor *tx; | |
1193 | struct async_submit_ctl submit; | |
1194 | struct r5dev *tgt; | |
1195 | struct page *dest; | |
1196 | int i; | |
1197 | int count; | |
1198 | ||
1199 | if (sh->ops.target < 0) | |
1200 | target = sh->ops.target2; | |
1201 | else if (sh->ops.target2 < 0) | |
1202 | target = sh->ops.target; | |
91c00924 | 1203 | else |
ac6b53b6 DW |
1204 | /* we should only have one valid target */ |
1205 | BUG(); | |
1206 | BUG_ON(target < 0); | |
1207 | pr_debug("%s: stripe %llu block: %d\n", | |
1208 | __func__, (unsigned long long)sh->sector, target); | |
1209 | ||
1210 | tgt = &sh->dev[target]; | |
1211 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1212 | dest = tgt->page; | |
1213 | ||
1214 | atomic_inc(&sh->count); | |
1215 | ||
1216 | if (target == qd_idx) { | |
1217 | count = set_syndrome_sources(blocks, sh); | |
1218 | blocks[count] = NULL; /* regenerating p is not necessary */ | |
1219 | BUG_ON(blocks[count+1] != dest); /* q should already be set */ | |
0403e382 DW |
1220 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1221 | ops_complete_compute, sh, | |
ac6b53b6 DW |
1222 | to_addr_conv(sh, percpu)); |
1223 | tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); | |
1224 | } else { | |
1225 | /* Compute any data- or p-drive using XOR */ | |
1226 | count = 0; | |
1227 | for (i = disks; i-- ; ) { | |
1228 | if (i == target || i == qd_idx) | |
1229 | continue; | |
1230 | blocks[count++] = sh->dev[i].page; | |
1231 | } | |
1232 | ||
0403e382 DW |
1233 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, |
1234 | NULL, ops_complete_compute, sh, | |
ac6b53b6 DW |
1235 | to_addr_conv(sh, percpu)); |
1236 | tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, &submit); | |
1237 | } | |
91c00924 | 1238 | |
91c00924 DW |
1239 | return tx; |
1240 | } | |
1241 | ||
ac6b53b6 DW |
1242 | static struct dma_async_tx_descriptor * |
1243 | ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu) | |
1244 | { | |
1245 | int i, count, disks = sh->disks; | |
1246 | int syndrome_disks = sh->ddf_layout ? disks : disks-2; | |
1247 | int d0_idx = raid6_d0(sh); | |
1248 | int faila = -1, failb = -1; | |
1249 | int target = sh->ops.target; | |
1250 | int target2 = sh->ops.target2; | |
1251 | struct r5dev *tgt = &sh->dev[target]; | |
1252 | struct r5dev *tgt2 = &sh->dev[target2]; | |
1253 | struct dma_async_tx_descriptor *tx; | |
1254 | struct page **blocks = percpu->scribble; | |
1255 | struct async_submit_ctl submit; | |
1256 | ||
1257 | pr_debug("%s: stripe %llu block1: %d block2: %d\n", | |
1258 | __func__, (unsigned long long)sh->sector, target, target2); | |
1259 | BUG_ON(target < 0 || target2 < 0); | |
1260 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1261 | BUG_ON(!test_bit(R5_Wantcompute, &tgt2->flags)); | |
1262 | ||
6c910a78 | 1263 | /* we need to open-code set_syndrome_sources to handle the |
ac6b53b6 DW |
1264 | * slot number conversion for 'faila' and 'failb' |
1265 | */ | |
1266 | for (i = 0; i < disks ; i++) | |
5dd33c9a | 1267 | blocks[i] = NULL; |
ac6b53b6 DW |
1268 | count = 0; |
1269 | i = d0_idx; | |
1270 | do { | |
1271 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); | |
1272 | ||
1273 | blocks[slot] = sh->dev[i].page; | |
1274 | ||
1275 | if (i == target) | |
1276 | faila = slot; | |
1277 | if (i == target2) | |
1278 | failb = slot; | |
1279 | i = raid6_next_disk(i, disks); | |
1280 | } while (i != d0_idx); | |
ac6b53b6 DW |
1281 | |
1282 | BUG_ON(faila == failb); | |
1283 | if (failb < faila) | |
1284 | swap(faila, failb); | |
1285 | pr_debug("%s: stripe: %llu faila: %d failb: %d\n", | |
1286 | __func__, (unsigned long long)sh->sector, faila, failb); | |
1287 | ||
1288 | atomic_inc(&sh->count); | |
1289 | ||
1290 | if (failb == syndrome_disks+1) { | |
1291 | /* Q disk is one of the missing disks */ | |
1292 | if (faila == syndrome_disks) { | |
1293 | /* Missing P+Q, just recompute */ | |
0403e382 DW |
1294 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1295 | ops_complete_compute, sh, | |
1296 | to_addr_conv(sh, percpu)); | |
e4424fee | 1297 | return async_gen_syndrome(blocks, 0, syndrome_disks+2, |
ac6b53b6 DW |
1298 | STRIPE_SIZE, &submit); |
1299 | } else { | |
1300 | struct page *dest; | |
1301 | int data_target; | |
1302 | int qd_idx = sh->qd_idx; | |
1303 | ||
1304 | /* Missing D+Q: recompute D from P, then recompute Q */ | |
1305 | if (target == qd_idx) | |
1306 | data_target = target2; | |
1307 | else | |
1308 | data_target = target; | |
1309 | ||
1310 | count = 0; | |
1311 | for (i = disks; i-- ; ) { | |
1312 | if (i == data_target || i == qd_idx) | |
1313 | continue; | |
1314 | blocks[count++] = sh->dev[i].page; | |
1315 | } | |
1316 | dest = sh->dev[data_target].page; | |
0403e382 DW |
1317 | init_async_submit(&submit, |
1318 | ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, | |
1319 | NULL, NULL, NULL, | |
1320 | to_addr_conv(sh, percpu)); | |
ac6b53b6 DW |
1321 | tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, |
1322 | &submit); | |
1323 | ||
1324 | count = set_syndrome_sources(blocks, sh); | |
0403e382 DW |
1325 | init_async_submit(&submit, ASYNC_TX_FENCE, tx, |
1326 | ops_complete_compute, sh, | |
1327 | to_addr_conv(sh, percpu)); | |
ac6b53b6 DW |
1328 | return async_gen_syndrome(blocks, 0, count+2, |
1329 | STRIPE_SIZE, &submit); | |
1330 | } | |
ac6b53b6 | 1331 | } else { |
6c910a78 DW |
1332 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1333 | ops_complete_compute, sh, | |
1334 | to_addr_conv(sh, percpu)); | |
1335 | if (failb == syndrome_disks) { | |
1336 | /* We're missing D+P. */ | |
1337 | return async_raid6_datap_recov(syndrome_disks+2, | |
1338 | STRIPE_SIZE, faila, | |
1339 | blocks, &submit); | |
1340 | } else { | |
1341 | /* We're missing D+D. */ | |
1342 | return async_raid6_2data_recov(syndrome_disks+2, | |
1343 | STRIPE_SIZE, faila, failb, | |
1344 | blocks, &submit); | |
1345 | } | |
ac6b53b6 DW |
1346 | } |
1347 | } | |
1348 | ||
91c00924 DW |
1349 | static void ops_complete_prexor(void *stripe_head_ref) |
1350 | { | |
1351 | struct stripe_head *sh = stripe_head_ref; | |
1352 | ||
e46b272b | 1353 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 | 1354 | (unsigned long long)sh->sector); |
91c00924 DW |
1355 | } |
1356 | ||
1357 | static struct dma_async_tx_descriptor * | |
d6f38f31 DW |
1358 | ops_run_prexor(struct stripe_head *sh, struct raid5_percpu *percpu, |
1359 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 1360 | { |
91c00924 | 1361 | int disks = sh->disks; |
d6f38f31 | 1362 | struct page **xor_srcs = percpu->scribble; |
91c00924 | 1363 | int count = 0, pd_idx = sh->pd_idx, i; |
a08abd8c | 1364 | struct async_submit_ctl submit; |
91c00924 DW |
1365 | |
1366 | /* existing parity data subtracted */ | |
1367 | struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; | |
1368 | ||
e46b272b | 1369 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1370 | (unsigned long long)sh->sector); |
1371 | ||
1372 | for (i = disks; i--; ) { | |
1373 | struct r5dev *dev = &sh->dev[i]; | |
1374 | /* Only process blocks that are known to be uptodate */ | |
d8ee0728 | 1375 | if (test_bit(R5_Wantdrain, &dev->flags)) |
91c00924 DW |
1376 | xor_srcs[count++] = dev->page; |
1377 | } | |
1378 | ||
0403e382 | 1379 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx, |
d6f38f31 | 1380 | ops_complete_prexor, sh, to_addr_conv(sh, percpu)); |
a08abd8c | 1381 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); |
91c00924 DW |
1382 | |
1383 | return tx; | |
1384 | } | |
1385 | ||
1386 | static struct dma_async_tx_descriptor * | |
d8ee0728 | 1387 | ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) |
91c00924 DW |
1388 | { |
1389 | int disks = sh->disks; | |
d8ee0728 | 1390 | int i; |
91c00924 | 1391 | |
e46b272b | 1392 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1393 | (unsigned long long)sh->sector); |
1394 | ||
1395 | for (i = disks; i--; ) { | |
1396 | struct r5dev *dev = &sh->dev[i]; | |
1397 | struct bio *chosen; | |
91c00924 | 1398 | |
d8ee0728 | 1399 | if (test_and_clear_bit(R5_Wantdrain, &dev->flags)) { |
91c00924 DW |
1400 | struct bio *wbi; |
1401 | ||
b17459c0 | 1402 | spin_lock_irq(&sh->stripe_lock); |
91c00924 DW |
1403 | chosen = dev->towrite; |
1404 | dev->towrite = NULL; | |
1405 | BUG_ON(dev->written); | |
1406 | wbi = dev->written = chosen; | |
b17459c0 | 1407 | spin_unlock_irq(&sh->stripe_lock); |
d592a996 | 1408 | WARN_ON(dev->page != dev->orig_page); |
91c00924 | 1409 | |
4f024f37 | 1410 | while (wbi && wbi->bi_iter.bi_sector < |
91c00924 | 1411 | dev->sector + STRIPE_SECTORS) { |
e9c7469b TH |
1412 | if (wbi->bi_rw & REQ_FUA) |
1413 | set_bit(R5_WantFUA, &dev->flags); | |
bc0934f0 SL |
1414 | if (wbi->bi_rw & REQ_SYNC) |
1415 | set_bit(R5_SyncIO, &dev->flags); | |
9e444768 | 1416 | if (wbi->bi_rw & REQ_DISCARD) |
620125f2 | 1417 | set_bit(R5_Discard, &dev->flags); |
d592a996 SL |
1418 | else { |
1419 | tx = async_copy_data(1, wbi, &dev->page, | |
1420 | dev->sector, tx, sh); | |
1421 | if (dev->page != dev->orig_page) { | |
1422 | set_bit(R5_SkipCopy, &dev->flags); | |
1423 | clear_bit(R5_UPTODATE, &dev->flags); | |
1424 | clear_bit(R5_OVERWRITE, &dev->flags); | |
1425 | } | |
1426 | } | |
91c00924 DW |
1427 | wbi = r5_next_bio(wbi, dev->sector); |
1428 | } | |
1429 | } | |
1430 | } | |
1431 | ||
1432 | return tx; | |
1433 | } | |
1434 | ||
ac6b53b6 | 1435 | static void ops_complete_reconstruct(void *stripe_head_ref) |
91c00924 DW |
1436 | { |
1437 | struct stripe_head *sh = stripe_head_ref; | |
ac6b53b6 DW |
1438 | int disks = sh->disks; |
1439 | int pd_idx = sh->pd_idx; | |
1440 | int qd_idx = sh->qd_idx; | |
1441 | int i; | |
9e444768 | 1442 | bool fua = false, sync = false, discard = false; |
91c00924 | 1443 | |
e46b272b | 1444 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1445 | (unsigned long long)sh->sector); |
1446 | ||
bc0934f0 | 1447 | for (i = disks; i--; ) { |
e9c7469b | 1448 | fua |= test_bit(R5_WantFUA, &sh->dev[i].flags); |
bc0934f0 | 1449 | sync |= test_bit(R5_SyncIO, &sh->dev[i].flags); |
9e444768 | 1450 | discard |= test_bit(R5_Discard, &sh->dev[i].flags); |
bc0934f0 | 1451 | } |
e9c7469b | 1452 | |
91c00924 DW |
1453 | for (i = disks; i--; ) { |
1454 | struct r5dev *dev = &sh->dev[i]; | |
ac6b53b6 | 1455 | |
e9c7469b | 1456 | if (dev->written || i == pd_idx || i == qd_idx) { |
d592a996 | 1457 | if (!discard && !test_bit(R5_SkipCopy, &dev->flags)) |
9e444768 | 1458 | set_bit(R5_UPTODATE, &dev->flags); |
e9c7469b TH |
1459 | if (fua) |
1460 | set_bit(R5_WantFUA, &dev->flags); | |
bc0934f0 SL |
1461 | if (sync) |
1462 | set_bit(R5_SyncIO, &dev->flags); | |
e9c7469b | 1463 | } |
91c00924 DW |
1464 | } |
1465 | ||
d8ee0728 DW |
1466 | if (sh->reconstruct_state == reconstruct_state_drain_run) |
1467 | sh->reconstruct_state = reconstruct_state_drain_result; | |
1468 | else if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) | |
1469 | sh->reconstruct_state = reconstruct_state_prexor_drain_result; | |
1470 | else { | |
1471 | BUG_ON(sh->reconstruct_state != reconstruct_state_run); | |
1472 | sh->reconstruct_state = reconstruct_state_result; | |
1473 | } | |
91c00924 DW |
1474 | |
1475 | set_bit(STRIPE_HANDLE, &sh->state); | |
1476 | release_stripe(sh); | |
1477 | } | |
1478 | ||
1479 | static void | |
ac6b53b6 DW |
1480 | ops_run_reconstruct5(struct stripe_head *sh, struct raid5_percpu *percpu, |
1481 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 1482 | { |
91c00924 | 1483 | int disks = sh->disks; |
d6f38f31 | 1484 | struct page **xor_srcs = percpu->scribble; |
a08abd8c | 1485 | struct async_submit_ctl submit; |
91c00924 DW |
1486 | int count = 0, pd_idx = sh->pd_idx, i; |
1487 | struct page *xor_dest; | |
d8ee0728 | 1488 | int prexor = 0; |
91c00924 | 1489 | unsigned long flags; |
91c00924 | 1490 | |
e46b272b | 1491 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1492 | (unsigned long long)sh->sector); |
1493 | ||
620125f2 SL |
1494 | for (i = 0; i < sh->disks; i++) { |
1495 | if (pd_idx == i) | |
1496 | continue; | |
1497 | if (!test_bit(R5_Discard, &sh->dev[i].flags)) | |
1498 | break; | |
1499 | } | |
1500 | if (i >= sh->disks) { | |
1501 | atomic_inc(&sh->count); | |
620125f2 SL |
1502 | set_bit(R5_Discard, &sh->dev[pd_idx].flags); |
1503 | ops_complete_reconstruct(sh); | |
1504 | return; | |
1505 | } | |
91c00924 DW |
1506 | /* check if prexor is active which means only process blocks |
1507 | * that are part of a read-modify-write (written) | |
1508 | */ | |
d8ee0728 DW |
1509 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) { |
1510 | prexor = 1; | |
91c00924 DW |
1511 | xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; |
1512 | for (i = disks; i--; ) { | |
1513 | struct r5dev *dev = &sh->dev[i]; | |
1514 | if (dev->written) | |
1515 | xor_srcs[count++] = dev->page; | |
1516 | } | |
1517 | } else { | |
1518 | xor_dest = sh->dev[pd_idx].page; | |
1519 | for (i = disks; i--; ) { | |
1520 | struct r5dev *dev = &sh->dev[i]; | |
1521 | if (i != pd_idx) | |
1522 | xor_srcs[count++] = dev->page; | |
1523 | } | |
1524 | } | |
1525 | ||
91c00924 DW |
1526 | /* 1/ if we prexor'd then the dest is reused as a source |
1527 | * 2/ if we did not prexor then we are redoing the parity | |
1528 | * set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST | |
1529 | * for the synchronous xor case | |
1530 | */ | |
88ba2aa5 | 1531 | flags = ASYNC_TX_ACK | |
91c00924 DW |
1532 | (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST); |
1533 | ||
1534 | atomic_inc(&sh->count); | |
1535 | ||
ac6b53b6 | 1536 | init_async_submit(&submit, flags, tx, ops_complete_reconstruct, sh, |
d6f38f31 | 1537 | to_addr_conv(sh, percpu)); |
a08abd8c DW |
1538 | if (unlikely(count == 1)) |
1539 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); | |
1540 | else | |
1541 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); | |
91c00924 DW |
1542 | } |
1543 | ||
ac6b53b6 DW |
1544 | static void |
1545 | ops_run_reconstruct6(struct stripe_head *sh, struct raid5_percpu *percpu, | |
1546 | struct dma_async_tx_descriptor *tx) | |
1547 | { | |
1548 | struct async_submit_ctl submit; | |
1549 | struct page **blocks = percpu->scribble; | |
620125f2 | 1550 | int count, i; |
ac6b53b6 DW |
1551 | |
1552 | pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector); | |
1553 | ||
620125f2 SL |
1554 | for (i = 0; i < sh->disks; i++) { |
1555 | if (sh->pd_idx == i || sh->qd_idx == i) | |
1556 | continue; | |
1557 | if (!test_bit(R5_Discard, &sh->dev[i].flags)) | |
1558 | break; | |
1559 | } | |
1560 | if (i >= sh->disks) { | |
1561 | atomic_inc(&sh->count); | |
620125f2 SL |
1562 | set_bit(R5_Discard, &sh->dev[sh->pd_idx].flags); |
1563 | set_bit(R5_Discard, &sh->dev[sh->qd_idx].flags); | |
1564 | ops_complete_reconstruct(sh); | |
1565 | return; | |
1566 | } | |
1567 | ||
ac6b53b6 DW |
1568 | count = set_syndrome_sources(blocks, sh); |
1569 | ||
1570 | atomic_inc(&sh->count); | |
1571 | ||
1572 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_reconstruct, | |
1573 | sh, to_addr_conv(sh, percpu)); | |
1574 | async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); | |
91c00924 DW |
1575 | } |
1576 | ||
1577 | static void ops_complete_check(void *stripe_head_ref) | |
1578 | { | |
1579 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 1580 | |
e46b272b | 1581 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1582 | (unsigned long long)sh->sector); |
1583 | ||
ecc65c9b | 1584 | sh->check_state = check_state_check_result; |
91c00924 DW |
1585 | set_bit(STRIPE_HANDLE, &sh->state); |
1586 | release_stripe(sh); | |
1587 | } | |
1588 | ||
ac6b53b6 | 1589 | static void ops_run_check_p(struct stripe_head *sh, struct raid5_percpu *percpu) |
91c00924 | 1590 | { |
91c00924 | 1591 | int disks = sh->disks; |
ac6b53b6 DW |
1592 | int pd_idx = sh->pd_idx; |
1593 | int qd_idx = sh->qd_idx; | |
1594 | struct page *xor_dest; | |
d6f38f31 | 1595 | struct page **xor_srcs = percpu->scribble; |
91c00924 | 1596 | struct dma_async_tx_descriptor *tx; |
a08abd8c | 1597 | struct async_submit_ctl submit; |
ac6b53b6 DW |
1598 | int count; |
1599 | int i; | |
91c00924 | 1600 | |
e46b272b | 1601 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1602 | (unsigned long long)sh->sector); |
1603 | ||
ac6b53b6 DW |
1604 | count = 0; |
1605 | xor_dest = sh->dev[pd_idx].page; | |
1606 | xor_srcs[count++] = xor_dest; | |
91c00924 | 1607 | for (i = disks; i--; ) { |
ac6b53b6 DW |
1608 | if (i == pd_idx || i == qd_idx) |
1609 | continue; | |
1610 | xor_srcs[count++] = sh->dev[i].page; | |
91c00924 DW |
1611 | } |
1612 | ||
d6f38f31 DW |
1613 | init_async_submit(&submit, 0, NULL, NULL, NULL, |
1614 | to_addr_conv(sh, percpu)); | |
099f53cb | 1615 | tx = async_xor_val(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, |
a08abd8c | 1616 | &sh->ops.zero_sum_result, &submit); |
91c00924 | 1617 | |
91c00924 | 1618 | atomic_inc(&sh->count); |
a08abd8c DW |
1619 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_check, sh, NULL); |
1620 | tx = async_trigger_callback(&submit); | |
91c00924 DW |
1621 | } |
1622 | ||
ac6b53b6 DW |
1623 | static void ops_run_check_pq(struct stripe_head *sh, struct raid5_percpu *percpu, int checkp) |
1624 | { | |
1625 | struct page **srcs = percpu->scribble; | |
1626 | struct async_submit_ctl submit; | |
1627 | int count; | |
1628 | ||
1629 | pr_debug("%s: stripe %llu checkp: %d\n", __func__, | |
1630 | (unsigned long long)sh->sector, checkp); | |
1631 | ||
1632 | count = set_syndrome_sources(srcs, sh); | |
1633 | if (!checkp) | |
1634 | srcs[count] = NULL; | |
91c00924 | 1635 | |
91c00924 | 1636 | atomic_inc(&sh->count); |
ac6b53b6 DW |
1637 | init_async_submit(&submit, ASYNC_TX_ACK, NULL, ops_complete_check, |
1638 | sh, to_addr_conv(sh, percpu)); | |
1639 | async_syndrome_val(srcs, 0, count+2, STRIPE_SIZE, | |
1640 | &sh->ops.zero_sum_result, percpu->spare_page, &submit); | |
91c00924 DW |
1641 | } |
1642 | ||
51acbcec | 1643 | static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request) |
91c00924 DW |
1644 | { |
1645 | int overlap_clear = 0, i, disks = sh->disks; | |
1646 | struct dma_async_tx_descriptor *tx = NULL; | |
d1688a6d | 1647 | struct r5conf *conf = sh->raid_conf; |
ac6b53b6 | 1648 | int level = conf->level; |
d6f38f31 DW |
1649 | struct raid5_percpu *percpu; |
1650 | unsigned long cpu; | |
91c00924 | 1651 | |
d6f38f31 DW |
1652 | cpu = get_cpu(); |
1653 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
83de75cc | 1654 | if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) { |
91c00924 DW |
1655 | ops_run_biofill(sh); |
1656 | overlap_clear++; | |
1657 | } | |
1658 | ||
7b3a871e | 1659 | if (test_bit(STRIPE_OP_COMPUTE_BLK, &ops_request)) { |
ac6b53b6 DW |
1660 | if (level < 6) |
1661 | tx = ops_run_compute5(sh, percpu); | |
1662 | else { | |
1663 | if (sh->ops.target2 < 0 || sh->ops.target < 0) | |
1664 | tx = ops_run_compute6_1(sh, percpu); | |
1665 | else | |
1666 | tx = ops_run_compute6_2(sh, percpu); | |
1667 | } | |
1668 | /* terminate the chain if reconstruct is not set to be run */ | |
1669 | if (tx && !test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) | |
7b3a871e DW |
1670 | async_tx_ack(tx); |
1671 | } | |
91c00924 | 1672 | |
600aa109 | 1673 | if (test_bit(STRIPE_OP_PREXOR, &ops_request)) |
d6f38f31 | 1674 | tx = ops_run_prexor(sh, percpu, tx); |
91c00924 | 1675 | |
600aa109 | 1676 | if (test_bit(STRIPE_OP_BIODRAIN, &ops_request)) { |
d8ee0728 | 1677 | tx = ops_run_biodrain(sh, tx); |
91c00924 DW |
1678 | overlap_clear++; |
1679 | } | |
1680 | ||
ac6b53b6 DW |
1681 | if (test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) { |
1682 | if (level < 6) | |
1683 | ops_run_reconstruct5(sh, percpu, tx); | |
1684 | else | |
1685 | ops_run_reconstruct6(sh, percpu, tx); | |
1686 | } | |
91c00924 | 1687 | |
ac6b53b6 DW |
1688 | if (test_bit(STRIPE_OP_CHECK, &ops_request)) { |
1689 | if (sh->check_state == check_state_run) | |
1690 | ops_run_check_p(sh, percpu); | |
1691 | else if (sh->check_state == check_state_run_q) | |
1692 | ops_run_check_pq(sh, percpu, 0); | |
1693 | else if (sh->check_state == check_state_run_pq) | |
1694 | ops_run_check_pq(sh, percpu, 1); | |
1695 | else | |
1696 | BUG(); | |
1697 | } | |
91c00924 | 1698 | |
91c00924 DW |
1699 | if (overlap_clear) |
1700 | for (i = disks; i--; ) { | |
1701 | struct r5dev *dev = &sh->dev[i]; | |
1702 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) | |
1703 | wake_up(&sh->raid_conf->wait_for_overlap); | |
1704 | } | |
d6f38f31 | 1705 | put_cpu(); |
91c00924 DW |
1706 | } |
1707 | ||
566c09c5 | 1708 | static int grow_one_stripe(struct r5conf *conf, int hash) |
1da177e4 LT |
1709 | { |
1710 | struct stripe_head *sh; | |
6ce32846 | 1711 | sh = kmem_cache_zalloc(conf->slab_cache, GFP_KERNEL); |
3f294f4f N |
1712 | if (!sh) |
1713 | return 0; | |
6ce32846 | 1714 | |
3f294f4f | 1715 | sh->raid_conf = conf; |
3f294f4f | 1716 | |
b17459c0 SL |
1717 | spin_lock_init(&sh->stripe_lock); |
1718 | ||
e4e11e38 N |
1719 | if (grow_buffers(sh)) { |
1720 | shrink_buffers(sh); | |
3f294f4f N |
1721 | kmem_cache_free(conf->slab_cache, sh); |
1722 | return 0; | |
1723 | } | |
566c09c5 | 1724 | sh->hash_lock_index = hash; |
3f294f4f N |
1725 | /* we just created an active stripe so... */ |
1726 | atomic_set(&sh->count, 1); | |
1727 | atomic_inc(&conf->active_stripes); | |
1728 | INIT_LIST_HEAD(&sh->lru); | |
1729 | release_stripe(sh); | |
1730 | return 1; | |
1731 | } | |
1732 | ||
d1688a6d | 1733 | static int grow_stripes(struct r5conf *conf, int num) |
3f294f4f | 1734 | { |
e18b890b | 1735 | struct kmem_cache *sc; |
5e5e3e78 | 1736 | int devs = max(conf->raid_disks, conf->previous_raid_disks); |
566c09c5 | 1737 | int hash; |
1da177e4 | 1738 | |
f4be6b43 N |
1739 | if (conf->mddev->gendisk) |
1740 | sprintf(conf->cache_name[0], | |
1741 | "raid%d-%s", conf->level, mdname(conf->mddev)); | |
1742 | else | |
1743 | sprintf(conf->cache_name[0], | |
1744 | "raid%d-%p", conf->level, conf->mddev); | |
1745 | sprintf(conf->cache_name[1], "%s-alt", conf->cache_name[0]); | |
1746 | ||
ad01c9e3 N |
1747 | conf->active_name = 0; |
1748 | sc = kmem_cache_create(conf->cache_name[conf->active_name], | |
1da177e4 | 1749 | sizeof(struct stripe_head)+(devs-1)*sizeof(struct r5dev), |
20c2df83 | 1750 | 0, 0, NULL); |
1da177e4 LT |
1751 | if (!sc) |
1752 | return 1; | |
1753 | conf->slab_cache = sc; | |
ad01c9e3 | 1754 | conf->pool_size = devs; |
566c09c5 SL |
1755 | hash = conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS; |
1756 | while (num--) { | |
1757 | if (!grow_one_stripe(conf, hash)) | |
1da177e4 | 1758 | return 1; |
566c09c5 SL |
1759 | conf->max_nr_stripes++; |
1760 | hash = (hash + 1) % NR_STRIPE_HASH_LOCKS; | |
1761 | } | |
1da177e4 LT |
1762 | return 0; |
1763 | } | |
29269553 | 1764 | |
d6f38f31 DW |
1765 | /** |
1766 | * scribble_len - return the required size of the scribble region | |
1767 | * @num - total number of disks in the array | |
1768 | * | |
1769 | * The size must be enough to contain: | |
1770 | * 1/ a struct page pointer for each device in the array +2 | |
1771 | * 2/ room to convert each entry in (1) to its corresponding dma | |
1772 | * (dma_map_page()) or page (page_address()) address. | |
1773 | * | |
1774 | * Note: the +2 is for the destination buffers of the ddf/raid6 case where we | |
1775 | * calculate over all devices (not just the data blocks), using zeros in place | |
1776 | * of the P and Q blocks. | |
1777 | */ | |
1778 | static size_t scribble_len(int num) | |
1779 | { | |
1780 | size_t len; | |
1781 | ||
1782 | len = sizeof(struct page *) * (num+2) + sizeof(addr_conv_t) * (num+2); | |
1783 | ||
1784 | return len; | |
1785 | } | |
1786 | ||
d1688a6d | 1787 | static int resize_stripes(struct r5conf *conf, int newsize) |
ad01c9e3 N |
1788 | { |
1789 | /* Make all the stripes able to hold 'newsize' devices. | |
1790 | * New slots in each stripe get 'page' set to a new page. | |
1791 | * | |
1792 | * This happens in stages: | |
1793 | * 1/ create a new kmem_cache and allocate the required number of | |
1794 | * stripe_heads. | |
83f0d77a | 1795 | * 2/ gather all the old stripe_heads and transfer the pages across |
ad01c9e3 N |
1796 | * to the new stripe_heads. This will have the side effect of |
1797 | * freezing the array as once all stripe_heads have been collected, | |
1798 | * no IO will be possible. Old stripe heads are freed once their | |
1799 | * pages have been transferred over, and the old kmem_cache is | |
1800 | * freed when all stripes are done. | |
1801 | * 3/ reallocate conf->disks to be suitable bigger. If this fails, | |
1802 | * we simple return a failre status - no need to clean anything up. | |
1803 | * 4/ allocate new pages for the new slots in the new stripe_heads. | |
1804 | * If this fails, we don't bother trying the shrink the | |
1805 | * stripe_heads down again, we just leave them as they are. | |
1806 | * As each stripe_head is processed the new one is released into | |
1807 | * active service. | |
1808 | * | |
1809 | * Once step2 is started, we cannot afford to wait for a write, | |
1810 | * so we use GFP_NOIO allocations. | |
1811 | */ | |
1812 | struct stripe_head *osh, *nsh; | |
1813 | LIST_HEAD(newstripes); | |
1814 | struct disk_info *ndisks; | |
d6f38f31 | 1815 | unsigned long cpu; |
b5470dc5 | 1816 | int err; |
e18b890b | 1817 | struct kmem_cache *sc; |
ad01c9e3 | 1818 | int i; |
566c09c5 | 1819 | int hash, cnt; |
ad01c9e3 N |
1820 | |
1821 | if (newsize <= conf->pool_size) | |
1822 | return 0; /* never bother to shrink */ | |
1823 | ||
b5470dc5 DW |
1824 | err = md_allow_write(conf->mddev); |
1825 | if (err) | |
1826 | return err; | |
2a2275d6 | 1827 | |
ad01c9e3 N |
1828 | /* Step 1 */ |
1829 | sc = kmem_cache_create(conf->cache_name[1-conf->active_name], | |
1830 | sizeof(struct stripe_head)+(newsize-1)*sizeof(struct r5dev), | |
20c2df83 | 1831 | 0, 0, NULL); |
ad01c9e3 N |
1832 | if (!sc) |
1833 | return -ENOMEM; | |
1834 | ||
1835 | for (i = conf->max_nr_stripes; i; i--) { | |
6ce32846 | 1836 | nsh = kmem_cache_zalloc(sc, GFP_KERNEL); |
ad01c9e3 N |
1837 | if (!nsh) |
1838 | break; | |
1839 | ||
ad01c9e3 | 1840 | nsh->raid_conf = conf; |
cb13ff69 | 1841 | spin_lock_init(&nsh->stripe_lock); |
ad01c9e3 N |
1842 | |
1843 | list_add(&nsh->lru, &newstripes); | |
1844 | } | |
1845 | if (i) { | |
1846 | /* didn't get enough, give up */ | |
1847 | while (!list_empty(&newstripes)) { | |
1848 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
1849 | list_del(&nsh->lru); | |
1850 | kmem_cache_free(sc, nsh); | |
1851 | } | |
1852 | kmem_cache_destroy(sc); | |
1853 | return -ENOMEM; | |
1854 | } | |
1855 | /* Step 2 - Must use GFP_NOIO now. | |
1856 | * OK, we have enough stripes, start collecting inactive | |
1857 | * stripes and copying them over | |
1858 | */ | |
566c09c5 SL |
1859 | hash = 0; |
1860 | cnt = 0; | |
ad01c9e3 | 1861 | list_for_each_entry(nsh, &newstripes, lru) { |
566c09c5 SL |
1862 | lock_device_hash_lock(conf, hash); |
1863 | wait_event_cmd(conf->wait_for_stripe, | |
1864 | !list_empty(conf->inactive_list + hash), | |
1865 | unlock_device_hash_lock(conf, hash), | |
1866 | lock_device_hash_lock(conf, hash)); | |
1867 | osh = get_free_stripe(conf, hash); | |
1868 | unlock_device_hash_lock(conf, hash); | |
ad01c9e3 | 1869 | atomic_set(&nsh->count, 1); |
d592a996 | 1870 | for(i=0; i<conf->pool_size; i++) { |
ad01c9e3 | 1871 | nsh->dev[i].page = osh->dev[i].page; |
d592a996 SL |
1872 | nsh->dev[i].orig_page = osh->dev[i].page; |
1873 | } | |
ad01c9e3 N |
1874 | for( ; i<newsize; i++) |
1875 | nsh->dev[i].page = NULL; | |
566c09c5 | 1876 | nsh->hash_lock_index = hash; |
ad01c9e3 | 1877 | kmem_cache_free(conf->slab_cache, osh); |
566c09c5 SL |
1878 | cnt++; |
1879 | if (cnt >= conf->max_nr_stripes / NR_STRIPE_HASH_LOCKS + | |
1880 | !!((conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS) > hash)) { | |
1881 | hash++; | |
1882 | cnt = 0; | |
1883 | } | |
ad01c9e3 N |
1884 | } |
1885 | kmem_cache_destroy(conf->slab_cache); | |
1886 | ||
1887 | /* Step 3. | |
1888 | * At this point, we are holding all the stripes so the array | |
1889 | * is completely stalled, so now is a good time to resize | |
d6f38f31 | 1890 | * conf->disks and the scribble region |
ad01c9e3 N |
1891 | */ |
1892 | ndisks = kzalloc(newsize * sizeof(struct disk_info), GFP_NOIO); | |
1893 | if (ndisks) { | |
1894 | for (i=0; i<conf->raid_disks; i++) | |
1895 | ndisks[i] = conf->disks[i]; | |
1896 | kfree(conf->disks); | |
1897 | conf->disks = ndisks; | |
1898 | } else | |
1899 | err = -ENOMEM; | |
1900 | ||
d6f38f31 DW |
1901 | get_online_cpus(); |
1902 | conf->scribble_len = scribble_len(newsize); | |
1903 | for_each_present_cpu(cpu) { | |
1904 | struct raid5_percpu *percpu; | |
1905 | void *scribble; | |
1906 | ||
1907 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
1908 | scribble = kmalloc(conf->scribble_len, GFP_NOIO); | |
1909 | ||
1910 | if (scribble) { | |
1911 | kfree(percpu->scribble); | |
1912 | percpu->scribble = scribble; | |
1913 | } else { | |
1914 | err = -ENOMEM; | |
1915 | break; | |
1916 | } | |
1917 | } | |
1918 | put_online_cpus(); | |
1919 | ||
ad01c9e3 N |
1920 | /* Step 4, return new stripes to service */ |
1921 | while(!list_empty(&newstripes)) { | |
1922 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
1923 | list_del_init(&nsh->lru); | |
d6f38f31 | 1924 | |
ad01c9e3 N |
1925 | for (i=conf->raid_disks; i < newsize; i++) |
1926 | if (nsh->dev[i].page == NULL) { | |
1927 | struct page *p = alloc_page(GFP_NOIO); | |
1928 | nsh->dev[i].page = p; | |
d592a996 | 1929 | nsh->dev[i].orig_page = p; |
ad01c9e3 N |
1930 | if (!p) |
1931 | err = -ENOMEM; | |
1932 | } | |
1933 | release_stripe(nsh); | |
1934 | } | |
1935 | /* critical section pass, GFP_NOIO no longer needed */ | |
1936 | ||
1937 | conf->slab_cache = sc; | |
1938 | conf->active_name = 1-conf->active_name; | |
1939 | conf->pool_size = newsize; | |
1940 | return err; | |
1941 | } | |
1da177e4 | 1942 | |
566c09c5 | 1943 | static int drop_one_stripe(struct r5conf *conf, int hash) |
1da177e4 LT |
1944 | { |
1945 | struct stripe_head *sh; | |
1946 | ||
566c09c5 SL |
1947 | spin_lock_irq(conf->hash_locks + hash); |
1948 | sh = get_free_stripe(conf, hash); | |
1949 | spin_unlock_irq(conf->hash_locks + hash); | |
3f294f4f N |
1950 | if (!sh) |
1951 | return 0; | |
78bafebd | 1952 | BUG_ON(atomic_read(&sh->count)); |
e4e11e38 | 1953 | shrink_buffers(sh); |
3f294f4f N |
1954 | kmem_cache_free(conf->slab_cache, sh); |
1955 | atomic_dec(&conf->active_stripes); | |
1956 | return 1; | |
1957 | } | |
1958 | ||
d1688a6d | 1959 | static void shrink_stripes(struct r5conf *conf) |
3f294f4f | 1960 | { |
566c09c5 SL |
1961 | int hash; |
1962 | for (hash = 0; hash < NR_STRIPE_HASH_LOCKS; hash++) | |
1963 | while (drop_one_stripe(conf, hash)) | |
1964 | ; | |
3f294f4f | 1965 | |
29fc7e3e N |
1966 | if (conf->slab_cache) |
1967 | kmem_cache_destroy(conf->slab_cache); | |
1da177e4 LT |
1968 | conf->slab_cache = NULL; |
1969 | } | |
1970 | ||
6712ecf8 | 1971 | static void raid5_end_read_request(struct bio * bi, int error) |
1da177e4 | 1972 | { |
99c0fb5f | 1973 | struct stripe_head *sh = bi->bi_private; |
d1688a6d | 1974 | struct r5conf *conf = sh->raid_conf; |
7ecaa1e6 | 1975 | int disks = sh->disks, i; |
1da177e4 | 1976 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
d6950432 | 1977 | char b[BDEVNAME_SIZE]; |
dd054fce | 1978 | struct md_rdev *rdev = NULL; |
05616be5 | 1979 | sector_t s; |
1da177e4 LT |
1980 | |
1981 | for (i=0 ; i<disks; i++) | |
1982 | if (bi == &sh->dev[i].req) | |
1983 | break; | |
1984 | ||
45b4233c DW |
1985 | pr_debug("end_read_request %llu/%d, count: %d, uptodate %d.\n", |
1986 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), | |
1da177e4 LT |
1987 | uptodate); |
1988 | if (i == disks) { | |
1989 | BUG(); | |
6712ecf8 | 1990 | return; |
1da177e4 | 1991 | } |
14a75d3e | 1992 | if (test_bit(R5_ReadRepl, &sh->dev[i].flags)) |
dd054fce N |
1993 | /* If replacement finished while this request was outstanding, |
1994 | * 'replacement' might be NULL already. | |
1995 | * In that case it moved down to 'rdev'. | |
1996 | * rdev is not removed until all requests are finished. | |
1997 | */ | |
14a75d3e | 1998 | rdev = conf->disks[i].replacement; |
dd054fce | 1999 | if (!rdev) |
14a75d3e | 2000 | rdev = conf->disks[i].rdev; |
1da177e4 | 2001 | |
05616be5 N |
2002 | if (use_new_offset(conf, sh)) |
2003 | s = sh->sector + rdev->new_data_offset; | |
2004 | else | |
2005 | s = sh->sector + rdev->data_offset; | |
1da177e4 | 2006 | if (uptodate) { |
1da177e4 | 2007 | set_bit(R5_UPTODATE, &sh->dev[i].flags); |
4e5314b5 | 2008 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { |
14a75d3e N |
2009 | /* Note that this cannot happen on a |
2010 | * replacement device. We just fail those on | |
2011 | * any error | |
2012 | */ | |
8bda470e CD |
2013 | printk_ratelimited( |
2014 | KERN_INFO | |
2015 | "md/raid:%s: read error corrected" | |
2016 | " (%lu sectors at %llu on %s)\n", | |
2017 | mdname(conf->mddev), STRIPE_SECTORS, | |
05616be5 | 2018 | (unsigned long long)s, |
8bda470e | 2019 | bdevname(rdev->bdev, b)); |
ddd5115f | 2020 | atomic_add(STRIPE_SECTORS, &rdev->corrected_errors); |
4e5314b5 N |
2021 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
2022 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
3f9e7c14 | 2023 | } else if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) |
2024 | clear_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
2025 | ||
14a75d3e N |
2026 | if (atomic_read(&rdev->read_errors)) |
2027 | atomic_set(&rdev->read_errors, 0); | |
1da177e4 | 2028 | } else { |
14a75d3e | 2029 | const char *bdn = bdevname(rdev->bdev, b); |
ba22dcbf | 2030 | int retry = 0; |
2e8ac303 | 2031 | int set_bad = 0; |
d6950432 | 2032 | |
1da177e4 | 2033 | clear_bit(R5_UPTODATE, &sh->dev[i].flags); |
d6950432 | 2034 | atomic_inc(&rdev->read_errors); |
14a75d3e N |
2035 | if (test_bit(R5_ReadRepl, &sh->dev[i].flags)) |
2036 | printk_ratelimited( | |
2037 | KERN_WARNING | |
2038 | "md/raid:%s: read error on replacement device " | |
2039 | "(sector %llu on %s).\n", | |
2040 | mdname(conf->mddev), | |
05616be5 | 2041 | (unsigned long long)s, |
14a75d3e | 2042 | bdn); |
2e8ac303 | 2043 | else if (conf->mddev->degraded >= conf->max_degraded) { |
2044 | set_bad = 1; | |
8bda470e CD |
2045 | printk_ratelimited( |
2046 | KERN_WARNING | |
2047 | "md/raid:%s: read error not correctable " | |
2048 | "(sector %llu on %s).\n", | |
2049 | mdname(conf->mddev), | |
05616be5 | 2050 | (unsigned long long)s, |
8bda470e | 2051 | bdn); |
2e8ac303 | 2052 | } else if (test_bit(R5_ReWrite, &sh->dev[i].flags)) { |
4e5314b5 | 2053 | /* Oh, no!!! */ |
2e8ac303 | 2054 | set_bad = 1; |
8bda470e CD |
2055 | printk_ratelimited( |
2056 | KERN_WARNING | |
2057 | "md/raid:%s: read error NOT corrected!! " | |
2058 | "(sector %llu on %s).\n", | |
2059 | mdname(conf->mddev), | |
05616be5 | 2060 | (unsigned long long)s, |
8bda470e | 2061 | bdn); |
2e8ac303 | 2062 | } else if (atomic_read(&rdev->read_errors) |
ba22dcbf | 2063 | > conf->max_nr_stripes) |
14f8d26b | 2064 | printk(KERN_WARNING |
0c55e022 | 2065 | "md/raid:%s: Too many read errors, failing device %s.\n", |
d6950432 | 2066 | mdname(conf->mddev), bdn); |
ba22dcbf N |
2067 | else |
2068 | retry = 1; | |
edfa1f65 BY |
2069 | if (set_bad && test_bit(In_sync, &rdev->flags) |
2070 | && !test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) | |
2071 | retry = 1; | |
ba22dcbf | 2072 | if (retry) |
3f9e7c14 | 2073 | if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) { |
2074 | set_bit(R5_ReadError, &sh->dev[i].flags); | |
2075 | clear_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
2076 | } else | |
2077 | set_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
ba22dcbf | 2078 | else { |
4e5314b5 N |
2079 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
2080 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
2e8ac303 | 2081 | if (!(set_bad |
2082 | && test_bit(In_sync, &rdev->flags) | |
2083 | && rdev_set_badblocks( | |
2084 | rdev, sh->sector, STRIPE_SECTORS, 0))) | |
2085 | md_error(conf->mddev, rdev); | |
ba22dcbf | 2086 | } |
1da177e4 | 2087 | } |
14a75d3e | 2088 | rdev_dec_pending(rdev, conf->mddev); |
1da177e4 LT |
2089 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
2090 | set_bit(STRIPE_HANDLE, &sh->state); | |
2091 | release_stripe(sh); | |
1da177e4 LT |
2092 | } |
2093 | ||
d710e138 | 2094 | static void raid5_end_write_request(struct bio *bi, int error) |
1da177e4 | 2095 | { |
99c0fb5f | 2096 | struct stripe_head *sh = bi->bi_private; |
d1688a6d | 2097 | struct r5conf *conf = sh->raid_conf; |
7ecaa1e6 | 2098 | int disks = sh->disks, i; |
977df362 | 2099 | struct md_rdev *uninitialized_var(rdev); |
1da177e4 | 2100 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
b84db560 N |
2101 | sector_t first_bad; |
2102 | int bad_sectors; | |
977df362 | 2103 | int replacement = 0; |
1da177e4 | 2104 | |
977df362 N |
2105 | for (i = 0 ; i < disks; i++) { |
2106 | if (bi == &sh->dev[i].req) { | |
2107 | rdev = conf->disks[i].rdev; | |
1da177e4 | 2108 | break; |
977df362 N |
2109 | } |
2110 | if (bi == &sh->dev[i].rreq) { | |
2111 | rdev = conf->disks[i].replacement; | |
dd054fce N |
2112 | if (rdev) |
2113 | replacement = 1; | |
2114 | else | |
2115 | /* rdev was removed and 'replacement' | |
2116 | * replaced it. rdev is not removed | |
2117 | * until all requests are finished. | |
2118 | */ | |
2119 | rdev = conf->disks[i].rdev; | |
977df362 N |
2120 | break; |
2121 | } | |
2122 | } | |
45b4233c | 2123 | pr_debug("end_write_request %llu/%d, count %d, uptodate: %d.\n", |
1da177e4 LT |
2124 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
2125 | uptodate); | |
2126 | if (i == disks) { | |
2127 | BUG(); | |
6712ecf8 | 2128 | return; |
1da177e4 LT |
2129 | } |
2130 | ||
977df362 N |
2131 | if (replacement) { |
2132 | if (!uptodate) | |
2133 | md_error(conf->mddev, rdev); | |
2134 | else if (is_badblock(rdev, sh->sector, | |
2135 | STRIPE_SECTORS, | |
2136 | &first_bad, &bad_sectors)) | |
2137 | set_bit(R5_MadeGoodRepl, &sh->dev[i].flags); | |
2138 | } else { | |
2139 | if (!uptodate) { | |
9f97e4b1 | 2140 | set_bit(STRIPE_DEGRADED, &sh->state); |
977df362 N |
2141 | set_bit(WriteErrorSeen, &rdev->flags); |
2142 | set_bit(R5_WriteError, &sh->dev[i].flags); | |
3a6de292 N |
2143 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) |
2144 | set_bit(MD_RECOVERY_NEEDED, | |
2145 | &rdev->mddev->recovery); | |
977df362 N |
2146 | } else if (is_badblock(rdev, sh->sector, |
2147 | STRIPE_SECTORS, | |
c0b32972 | 2148 | &first_bad, &bad_sectors)) { |
977df362 | 2149 | set_bit(R5_MadeGood, &sh->dev[i].flags); |
c0b32972 N |
2150 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) |
2151 | /* That was a successful write so make | |
2152 | * sure it looks like we already did | |
2153 | * a re-write. | |
2154 | */ | |
2155 | set_bit(R5_ReWrite, &sh->dev[i].flags); | |
2156 | } | |
977df362 N |
2157 | } |
2158 | rdev_dec_pending(rdev, conf->mddev); | |
1da177e4 | 2159 | |
977df362 N |
2160 | if (!test_and_clear_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags)) |
2161 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
1da177e4 | 2162 | set_bit(STRIPE_HANDLE, &sh->state); |
c04be0aa | 2163 | release_stripe(sh); |
1da177e4 LT |
2164 | } |
2165 | ||
784052ec | 2166 | static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous); |
d592a996 | 2167 | |
784052ec | 2168 | static void raid5_build_block(struct stripe_head *sh, int i, int previous) |
1da177e4 LT |
2169 | { |
2170 | struct r5dev *dev = &sh->dev[i]; | |
2171 | ||
2172 | bio_init(&dev->req); | |
2173 | dev->req.bi_io_vec = &dev->vec; | |
d592a996 | 2174 | dev->req.bi_max_vecs = 1; |
1da177e4 LT |
2175 | dev->req.bi_private = sh; |
2176 | ||
977df362 N |
2177 | bio_init(&dev->rreq); |
2178 | dev->rreq.bi_io_vec = &dev->rvec; | |
d592a996 | 2179 | dev->rreq.bi_max_vecs = 1; |
977df362 | 2180 | dev->rreq.bi_private = sh; |
977df362 | 2181 | |
1da177e4 | 2182 | dev->flags = 0; |
784052ec | 2183 | dev->sector = compute_blocknr(sh, i, previous); |
1da177e4 LT |
2184 | } |
2185 | ||
fd01b88c | 2186 | static void error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
2187 | { |
2188 | char b[BDEVNAME_SIZE]; | |
d1688a6d | 2189 | struct r5conf *conf = mddev->private; |
908f4fbd | 2190 | unsigned long flags; |
0c55e022 | 2191 | pr_debug("raid456: error called\n"); |
1da177e4 | 2192 | |
908f4fbd N |
2193 | spin_lock_irqsave(&conf->device_lock, flags); |
2194 | clear_bit(In_sync, &rdev->flags); | |
2195 | mddev->degraded = calc_degraded(conf); | |
2196 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
2197 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2198 | ||
de393cde | 2199 | set_bit(Blocked, &rdev->flags); |
6f8d0c77 N |
2200 | set_bit(Faulty, &rdev->flags); |
2201 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2202 | printk(KERN_ALERT | |
2203 | "md/raid:%s: Disk failure on %s, disabling device.\n" | |
2204 | "md/raid:%s: Operation continuing on %d devices.\n", | |
2205 | mdname(mddev), | |
2206 | bdevname(rdev->bdev, b), | |
2207 | mdname(mddev), | |
2208 | conf->raid_disks - mddev->degraded); | |
16a53ecc | 2209 | } |
1da177e4 LT |
2210 | |
2211 | /* | |
2212 | * Input: a 'big' sector number, | |
2213 | * Output: index of the data and parity disk, and the sector # in them. | |
2214 | */ | |
d1688a6d | 2215 | static sector_t raid5_compute_sector(struct r5conf *conf, sector_t r_sector, |
911d4ee8 N |
2216 | int previous, int *dd_idx, |
2217 | struct stripe_head *sh) | |
1da177e4 | 2218 | { |
6e3b96ed | 2219 | sector_t stripe, stripe2; |
35f2a591 | 2220 | sector_t chunk_number; |
1da177e4 | 2221 | unsigned int chunk_offset; |
911d4ee8 | 2222 | int pd_idx, qd_idx; |
67cc2b81 | 2223 | int ddf_layout = 0; |
1da177e4 | 2224 | sector_t new_sector; |
e183eaed N |
2225 | int algorithm = previous ? conf->prev_algo |
2226 | : conf->algorithm; | |
09c9e5fa AN |
2227 | int sectors_per_chunk = previous ? conf->prev_chunk_sectors |
2228 | : conf->chunk_sectors; | |
112bf897 N |
2229 | int raid_disks = previous ? conf->previous_raid_disks |
2230 | : conf->raid_disks; | |
2231 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 LT |
2232 | |
2233 | /* First compute the information on this sector */ | |
2234 | ||
2235 | /* | |
2236 | * Compute the chunk number and the sector offset inside the chunk | |
2237 | */ | |
2238 | chunk_offset = sector_div(r_sector, sectors_per_chunk); | |
2239 | chunk_number = r_sector; | |
1da177e4 LT |
2240 | |
2241 | /* | |
2242 | * Compute the stripe number | |
2243 | */ | |
35f2a591 N |
2244 | stripe = chunk_number; |
2245 | *dd_idx = sector_div(stripe, data_disks); | |
6e3b96ed | 2246 | stripe2 = stripe; |
1da177e4 LT |
2247 | /* |
2248 | * Select the parity disk based on the user selected algorithm. | |
2249 | */ | |
84789554 | 2250 | pd_idx = qd_idx = -1; |
16a53ecc N |
2251 | switch(conf->level) { |
2252 | case 4: | |
911d4ee8 | 2253 | pd_idx = data_disks; |
16a53ecc N |
2254 | break; |
2255 | case 5: | |
e183eaed | 2256 | switch (algorithm) { |
1da177e4 | 2257 | case ALGORITHM_LEFT_ASYMMETRIC: |
6e3b96ed | 2258 | pd_idx = data_disks - sector_div(stripe2, raid_disks); |
911d4ee8 | 2259 | if (*dd_idx >= pd_idx) |
1da177e4 LT |
2260 | (*dd_idx)++; |
2261 | break; | |
2262 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
6e3b96ed | 2263 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 | 2264 | if (*dd_idx >= pd_idx) |
1da177e4 LT |
2265 | (*dd_idx)++; |
2266 | break; | |
2267 | case ALGORITHM_LEFT_SYMMETRIC: | |
6e3b96ed | 2268 | pd_idx = data_disks - sector_div(stripe2, raid_disks); |
911d4ee8 | 2269 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; |
1da177e4 LT |
2270 | break; |
2271 | case ALGORITHM_RIGHT_SYMMETRIC: | |
6e3b96ed | 2272 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 | 2273 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; |
1da177e4 | 2274 | break; |
99c0fb5f N |
2275 | case ALGORITHM_PARITY_0: |
2276 | pd_idx = 0; | |
2277 | (*dd_idx)++; | |
2278 | break; | |
2279 | case ALGORITHM_PARITY_N: | |
2280 | pd_idx = data_disks; | |
2281 | break; | |
1da177e4 | 2282 | default: |
99c0fb5f | 2283 | BUG(); |
16a53ecc N |
2284 | } |
2285 | break; | |
2286 | case 6: | |
2287 | ||
e183eaed | 2288 | switch (algorithm) { |
16a53ecc | 2289 | case ALGORITHM_LEFT_ASYMMETRIC: |
6e3b96ed | 2290 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
911d4ee8 N |
2291 | qd_idx = pd_idx + 1; |
2292 | if (pd_idx == raid_disks-1) { | |
99c0fb5f | 2293 | (*dd_idx)++; /* Q D D D P */ |
911d4ee8 N |
2294 | qd_idx = 0; |
2295 | } else if (*dd_idx >= pd_idx) | |
16a53ecc N |
2296 | (*dd_idx) += 2; /* D D P Q D */ |
2297 | break; | |
2298 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
6e3b96ed | 2299 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 N |
2300 | qd_idx = pd_idx + 1; |
2301 | if (pd_idx == raid_disks-1) { | |
99c0fb5f | 2302 | (*dd_idx)++; /* Q D D D P */ |
911d4ee8 N |
2303 | qd_idx = 0; |
2304 | } else if (*dd_idx >= pd_idx) | |
16a53ecc N |
2305 | (*dd_idx) += 2; /* D D P Q D */ |
2306 | break; | |
2307 | case ALGORITHM_LEFT_SYMMETRIC: | |
6e3b96ed | 2308 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
911d4ee8 N |
2309 | qd_idx = (pd_idx + 1) % raid_disks; |
2310 | *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; | |
16a53ecc N |
2311 | break; |
2312 | case ALGORITHM_RIGHT_SYMMETRIC: | |
6e3b96ed | 2313 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 N |
2314 | qd_idx = (pd_idx + 1) % raid_disks; |
2315 | *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; | |
16a53ecc | 2316 | break; |
99c0fb5f N |
2317 | |
2318 | case ALGORITHM_PARITY_0: | |
2319 | pd_idx = 0; | |
2320 | qd_idx = 1; | |
2321 | (*dd_idx) += 2; | |
2322 | break; | |
2323 | case ALGORITHM_PARITY_N: | |
2324 | pd_idx = data_disks; | |
2325 | qd_idx = data_disks + 1; | |
2326 | break; | |
2327 | ||
2328 | case ALGORITHM_ROTATING_ZERO_RESTART: | |
2329 | /* Exactly the same as RIGHT_ASYMMETRIC, but or | |
2330 | * of blocks for computing Q is different. | |
2331 | */ | |
6e3b96ed | 2332 | pd_idx = sector_div(stripe2, raid_disks); |
99c0fb5f N |
2333 | qd_idx = pd_idx + 1; |
2334 | if (pd_idx == raid_disks-1) { | |
2335 | (*dd_idx)++; /* Q D D D P */ | |
2336 | qd_idx = 0; | |
2337 | } else if (*dd_idx >= pd_idx) | |
2338 | (*dd_idx) += 2; /* D D P Q D */ | |
67cc2b81 | 2339 | ddf_layout = 1; |
99c0fb5f N |
2340 | break; |
2341 | ||
2342 | case ALGORITHM_ROTATING_N_RESTART: | |
2343 | /* Same a left_asymmetric, by first stripe is | |
2344 | * D D D P Q rather than | |
2345 | * Q D D D P | |
2346 | */ | |
6e3b96ed N |
2347 | stripe2 += 1; |
2348 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); | |
99c0fb5f N |
2349 | qd_idx = pd_idx + 1; |
2350 | if (pd_idx == raid_disks-1) { | |
2351 | (*dd_idx)++; /* Q D D D P */ | |
2352 | qd_idx = 0; | |
2353 | } else if (*dd_idx >= pd_idx) | |
2354 | (*dd_idx) += 2; /* D D P Q D */ | |
67cc2b81 | 2355 | ddf_layout = 1; |
99c0fb5f N |
2356 | break; |
2357 | ||
2358 | case ALGORITHM_ROTATING_N_CONTINUE: | |
2359 | /* Same as left_symmetric but Q is before P */ | |
6e3b96ed | 2360 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
99c0fb5f N |
2361 | qd_idx = (pd_idx + raid_disks - 1) % raid_disks; |
2362 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; | |
67cc2b81 | 2363 | ddf_layout = 1; |
99c0fb5f N |
2364 | break; |
2365 | ||
2366 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
2367 | /* RAID5 left_asymmetric, with Q on last device */ | |
6e3b96ed | 2368 | pd_idx = data_disks - sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2369 | if (*dd_idx >= pd_idx) |
2370 | (*dd_idx)++; | |
2371 | qd_idx = raid_disks - 1; | |
2372 | break; | |
2373 | ||
2374 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
6e3b96ed | 2375 | pd_idx = sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2376 | if (*dd_idx >= pd_idx) |
2377 | (*dd_idx)++; | |
2378 | qd_idx = raid_disks - 1; | |
2379 | break; | |
2380 | ||
2381 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
6e3b96ed | 2382 | pd_idx = data_disks - sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2383 | *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); |
2384 | qd_idx = raid_disks - 1; | |
2385 | break; | |
2386 | ||
2387 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
6e3b96ed | 2388 | pd_idx = sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2389 | *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); |
2390 | qd_idx = raid_disks - 1; | |
2391 | break; | |
2392 | ||
2393 | case ALGORITHM_PARITY_0_6: | |
2394 | pd_idx = 0; | |
2395 | (*dd_idx)++; | |
2396 | qd_idx = raid_disks - 1; | |
2397 | break; | |
2398 | ||
16a53ecc | 2399 | default: |
99c0fb5f | 2400 | BUG(); |
16a53ecc N |
2401 | } |
2402 | break; | |
1da177e4 LT |
2403 | } |
2404 | ||
911d4ee8 N |
2405 | if (sh) { |
2406 | sh->pd_idx = pd_idx; | |
2407 | sh->qd_idx = qd_idx; | |
67cc2b81 | 2408 | sh->ddf_layout = ddf_layout; |
911d4ee8 | 2409 | } |
1da177e4 LT |
2410 | /* |
2411 | * Finally, compute the new sector number | |
2412 | */ | |
2413 | new_sector = (sector_t)stripe * sectors_per_chunk + chunk_offset; | |
2414 | return new_sector; | |
2415 | } | |
2416 | ||
784052ec | 2417 | static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous) |
1da177e4 | 2418 | { |
d1688a6d | 2419 | struct r5conf *conf = sh->raid_conf; |
b875e531 N |
2420 | int raid_disks = sh->disks; |
2421 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 | 2422 | sector_t new_sector = sh->sector, check; |
09c9e5fa AN |
2423 | int sectors_per_chunk = previous ? conf->prev_chunk_sectors |
2424 | : conf->chunk_sectors; | |
e183eaed N |
2425 | int algorithm = previous ? conf->prev_algo |
2426 | : conf->algorithm; | |
1da177e4 LT |
2427 | sector_t stripe; |
2428 | int chunk_offset; | |
35f2a591 N |
2429 | sector_t chunk_number; |
2430 | int dummy1, dd_idx = i; | |
1da177e4 | 2431 | sector_t r_sector; |
911d4ee8 | 2432 | struct stripe_head sh2; |
1da177e4 LT |
2433 | |
2434 | chunk_offset = sector_div(new_sector, sectors_per_chunk); | |
2435 | stripe = new_sector; | |
1da177e4 | 2436 | |
16a53ecc N |
2437 | if (i == sh->pd_idx) |
2438 | return 0; | |
2439 | switch(conf->level) { | |
2440 | case 4: break; | |
2441 | case 5: | |
e183eaed | 2442 | switch (algorithm) { |
1da177e4 LT |
2443 | case ALGORITHM_LEFT_ASYMMETRIC: |
2444 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
2445 | if (i > sh->pd_idx) | |
2446 | i--; | |
2447 | break; | |
2448 | case ALGORITHM_LEFT_SYMMETRIC: | |
2449 | case ALGORITHM_RIGHT_SYMMETRIC: | |
2450 | if (i < sh->pd_idx) | |
2451 | i += raid_disks; | |
2452 | i -= (sh->pd_idx + 1); | |
2453 | break; | |
99c0fb5f N |
2454 | case ALGORITHM_PARITY_0: |
2455 | i -= 1; | |
2456 | break; | |
2457 | case ALGORITHM_PARITY_N: | |
2458 | break; | |
1da177e4 | 2459 | default: |
99c0fb5f | 2460 | BUG(); |
16a53ecc N |
2461 | } |
2462 | break; | |
2463 | case 6: | |
d0dabf7e | 2464 | if (i == sh->qd_idx) |
16a53ecc | 2465 | return 0; /* It is the Q disk */ |
e183eaed | 2466 | switch (algorithm) { |
16a53ecc N |
2467 | case ALGORITHM_LEFT_ASYMMETRIC: |
2468 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
99c0fb5f N |
2469 | case ALGORITHM_ROTATING_ZERO_RESTART: |
2470 | case ALGORITHM_ROTATING_N_RESTART: | |
2471 | if (sh->pd_idx == raid_disks-1) | |
2472 | i--; /* Q D D D P */ | |
16a53ecc N |
2473 | else if (i > sh->pd_idx) |
2474 | i -= 2; /* D D P Q D */ | |
2475 | break; | |
2476 | case ALGORITHM_LEFT_SYMMETRIC: | |
2477 | case ALGORITHM_RIGHT_SYMMETRIC: | |
2478 | if (sh->pd_idx == raid_disks-1) | |
2479 | i--; /* Q D D D P */ | |
2480 | else { | |
2481 | /* D D P Q D */ | |
2482 | if (i < sh->pd_idx) | |
2483 | i += raid_disks; | |
2484 | i -= (sh->pd_idx + 2); | |
2485 | } | |
2486 | break; | |
99c0fb5f N |
2487 | case ALGORITHM_PARITY_0: |
2488 | i -= 2; | |
2489 | break; | |
2490 | case ALGORITHM_PARITY_N: | |
2491 | break; | |
2492 | case ALGORITHM_ROTATING_N_CONTINUE: | |
e4424fee | 2493 | /* Like left_symmetric, but P is before Q */ |
99c0fb5f N |
2494 | if (sh->pd_idx == 0) |
2495 | i--; /* P D D D Q */ | |
e4424fee N |
2496 | else { |
2497 | /* D D Q P D */ | |
2498 | if (i < sh->pd_idx) | |
2499 | i += raid_disks; | |
2500 | i -= (sh->pd_idx + 1); | |
2501 | } | |
99c0fb5f N |
2502 | break; |
2503 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
2504 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
2505 | if (i > sh->pd_idx) | |
2506 | i--; | |
2507 | break; | |
2508 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
2509 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
2510 | if (i < sh->pd_idx) | |
2511 | i += data_disks + 1; | |
2512 | i -= (sh->pd_idx + 1); | |
2513 | break; | |
2514 | case ALGORITHM_PARITY_0_6: | |
2515 | i -= 1; | |
2516 | break; | |
16a53ecc | 2517 | default: |
99c0fb5f | 2518 | BUG(); |
16a53ecc N |
2519 | } |
2520 | break; | |
1da177e4 LT |
2521 | } |
2522 | ||
2523 | chunk_number = stripe * data_disks + i; | |
35f2a591 | 2524 | r_sector = chunk_number * sectors_per_chunk + chunk_offset; |
1da177e4 | 2525 | |
112bf897 | 2526 | check = raid5_compute_sector(conf, r_sector, |
784052ec | 2527 | previous, &dummy1, &sh2); |
911d4ee8 N |
2528 | if (check != sh->sector || dummy1 != dd_idx || sh2.pd_idx != sh->pd_idx |
2529 | || sh2.qd_idx != sh->qd_idx) { | |
0c55e022 N |
2530 | printk(KERN_ERR "md/raid:%s: compute_blocknr: map not correct\n", |
2531 | mdname(conf->mddev)); | |
1da177e4 LT |
2532 | return 0; |
2533 | } | |
2534 | return r_sector; | |
2535 | } | |
2536 | ||
600aa109 | 2537 | static void |
c0f7bddb | 2538 | schedule_reconstruction(struct stripe_head *sh, struct stripe_head_state *s, |
600aa109 | 2539 | int rcw, int expand) |
e33129d8 DW |
2540 | { |
2541 | int i, pd_idx = sh->pd_idx, disks = sh->disks; | |
d1688a6d | 2542 | struct r5conf *conf = sh->raid_conf; |
c0f7bddb | 2543 | int level = conf->level; |
e33129d8 DW |
2544 | |
2545 | if (rcw) { | |
e33129d8 DW |
2546 | |
2547 | for (i = disks; i--; ) { | |
2548 | struct r5dev *dev = &sh->dev[i]; | |
2549 | ||
2550 | if (dev->towrite) { | |
2551 | set_bit(R5_LOCKED, &dev->flags); | |
d8ee0728 | 2552 | set_bit(R5_Wantdrain, &dev->flags); |
e33129d8 DW |
2553 | if (!expand) |
2554 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 2555 | s->locked++; |
e33129d8 DW |
2556 | } |
2557 | } | |
ce7d363a N |
2558 | /* if we are not expanding this is a proper write request, and |
2559 | * there will be bios with new data to be drained into the | |
2560 | * stripe cache | |
2561 | */ | |
2562 | if (!expand) { | |
2563 | if (!s->locked) | |
2564 | /* False alarm, nothing to do */ | |
2565 | return; | |
2566 | sh->reconstruct_state = reconstruct_state_drain_run; | |
2567 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
2568 | } else | |
2569 | sh->reconstruct_state = reconstruct_state_run; | |
2570 | ||
2571 | set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); | |
2572 | ||
c0f7bddb | 2573 | if (s->locked + conf->max_degraded == disks) |
8b3e6cdc | 2574 | if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state)) |
c0f7bddb | 2575 | atomic_inc(&conf->pending_full_writes); |
e33129d8 | 2576 | } else { |
c0f7bddb | 2577 | BUG_ON(level == 6); |
e33129d8 DW |
2578 | BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) || |
2579 | test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags))); | |
2580 | ||
e33129d8 DW |
2581 | for (i = disks; i--; ) { |
2582 | struct r5dev *dev = &sh->dev[i]; | |
2583 | if (i == pd_idx) | |
2584 | continue; | |
2585 | ||
e33129d8 DW |
2586 | if (dev->towrite && |
2587 | (test_bit(R5_UPTODATE, &dev->flags) || | |
d8ee0728 DW |
2588 | test_bit(R5_Wantcompute, &dev->flags))) { |
2589 | set_bit(R5_Wantdrain, &dev->flags); | |
e33129d8 DW |
2590 | set_bit(R5_LOCKED, &dev->flags); |
2591 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 2592 | s->locked++; |
e33129d8 DW |
2593 | } |
2594 | } | |
ce7d363a N |
2595 | if (!s->locked) |
2596 | /* False alarm - nothing to do */ | |
2597 | return; | |
2598 | sh->reconstruct_state = reconstruct_state_prexor_drain_run; | |
2599 | set_bit(STRIPE_OP_PREXOR, &s->ops_request); | |
2600 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
2601 | set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); | |
e33129d8 DW |
2602 | } |
2603 | ||
c0f7bddb | 2604 | /* keep the parity disk(s) locked while asynchronous operations |
e33129d8 DW |
2605 | * are in flight |
2606 | */ | |
2607 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); | |
2608 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
600aa109 | 2609 | s->locked++; |
e33129d8 | 2610 | |
c0f7bddb YT |
2611 | if (level == 6) { |
2612 | int qd_idx = sh->qd_idx; | |
2613 | struct r5dev *dev = &sh->dev[qd_idx]; | |
2614 | ||
2615 | set_bit(R5_LOCKED, &dev->flags); | |
2616 | clear_bit(R5_UPTODATE, &dev->flags); | |
2617 | s->locked++; | |
2618 | } | |
2619 | ||
600aa109 | 2620 | pr_debug("%s: stripe %llu locked: %d ops_request: %lx\n", |
e46b272b | 2621 | __func__, (unsigned long long)sh->sector, |
600aa109 | 2622 | s->locked, s->ops_request); |
e33129d8 | 2623 | } |
16a53ecc | 2624 | |
1da177e4 LT |
2625 | /* |
2626 | * Each stripe/dev can have one or more bion attached. | |
16a53ecc | 2627 | * toread/towrite point to the first in a chain. |
1da177e4 LT |
2628 | * The bi_next chain must be in order. |
2629 | */ | |
2630 | static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, int forwrite) | |
2631 | { | |
2632 | struct bio **bip; | |
d1688a6d | 2633 | struct r5conf *conf = sh->raid_conf; |
72626685 | 2634 | int firstwrite=0; |
1da177e4 | 2635 | |
cbe47ec5 | 2636 | pr_debug("adding bi b#%llu to stripe s#%llu\n", |
4f024f37 | 2637 | (unsigned long long)bi->bi_iter.bi_sector, |
1da177e4 LT |
2638 | (unsigned long long)sh->sector); |
2639 | ||
b17459c0 SL |
2640 | /* |
2641 | * If several bio share a stripe. The bio bi_phys_segments acts as a | |
2642 | * reference count to avoid race. The reference count should already be | |
2643 | * increased before this function is called (for example, in | |
2644 | * make_request()), so other bio sharing this stripe will not free the | |
2645 | * stripe. If a stripe is owned by one stripe, the stripe lock will | |
2646 | * protect it. | |
2647 | */ | |
2648 | spin_lock_irq(&sh->stripe_lock); | |
72626685 | 2649 | if (forwrite) { |
1da177e4 | 2650 | bip = &sh->dev[dd_idx].towrite; |
7eaf7e8e | 2651 | if (*bip == NULL) |
72626685 N |
2652 | firstwrite = 1; |
2653 | } else | |
1da177e4 | 2654 | bip = &sh->dev[dd_idx].toread; |
4f024f37 KO |
2655 | while (*bip && (*bip)->bi_iter.bi_sector < bi->bi_iter.bi_sector) { |
2656 | if (bio_end_sector(*bip) > bi->bi_iter.bi_sector) | |
1da177e4 LT |
2657 | goto overlap; |
2658 | bip = & (*bip)->bi_next; | |
2659 | } | |
4f024f37 | 2660 | if (*bip && (*bip)->bi_iter.bi_sector < bio_end_sector(bi)) |
1da177e4 LT |
2661 | goto overlap; |
2662 | ||
78bafebd | 2663 | BUG_ON(*bip && bi->bi_next && (*bip) != bi->bi_next); |
1da177e4 LT |
2664 | if (*bip) |
2665 | bi->bi_next = *bip; | |
2666 | *bip = bi; | |
e7836bd6 | 2667 | raid5_inc_bi_active_stripes(bi); |
72626685 | 2668 | |
1da177e4 LT |
2669 | if (forwrite) { |
2670 | /* check if page is covered */ | |
2671 | sector_t sector = sh->dev[dd_idx].sector; | |
2672 | for (bi=sh->dev[dd_idx].towrite; | |
2673 | sector < sh->dev[dd_idx].sector + STRIPE_SECTORS && | |
4f024f37 | 2674 | bi && bi->bi_iter.bi_sector <= sector; |
1da177e4 | 2675 | bi = r5_next_bio(bi, sh->dev[dd_idx].sector)) { |
f73a1c7d KO |
2676 | if (bio_end_sector(bi) >= sector) |
2677 | sector = bio_end_sector(bi); | |
1da177e4 LT |
2678 | } |
2679 | if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS) | |
2680 | set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags); | |
2681 | } | |
cbe47ec5 N |
2682 | |
2683 | pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n", | |
4f024f37 | 2684 | (unsigned long long)(*bip)->bi_iter.bi_sector, |
cbe47ec5 | 2685 | (unsigned long long)sh->sector, dd_idx); |
b97390ae | 2686 | spin_unlock_irq(&sh->stripe_lock); |
cbe47ec5 N |
2687 | |
2688 | if (conf->mddev->bitmap && firstwrite) { | |
2689 | bitmap_startwrite(conf->mddev->bitmap, sh->sector, | |
2690 | STRIPE_SECTORS, 0); | |
2691 | sh->bm_seq = conf->seq_flush+1; | |
2692 | set_bit(STRIPE_BIT_DELAY, &sh->state); | |
2693 | } | |
1da177e4 LT |
2694 | return 1; |
2695 | ||
2696 | overlap: | |
2697 | set_bit(R5_Overlap, &sh->dev[dd_idx].flags); | |
b17459c0 | 2698 | spin_unlock_irq(&sh->stripe_lock); |
1da177e4 LT |
2699 | return 0; |
2700 | } | |
2701 | ||
d1688a6d | 2702 | static void end_reshape(struct r5conf *conf); |
29269553 | 2703 | |
d1688a6d | 2704 | static void stripe_set_idx(sector_t stripe, struct r5conf *conf, int previous, |
911d4ee8 | 2705 | struct stripe_head *sh) |
ccfcc3c1 | 2706 | { |
784052ec | 2707 | int sectors_per_chunk = |
09c9e5fa | 2708 | previous ? conf->prev_chunk_sectors : conf->chunk_sectors; |
911d4ee8 | 2709 | int dd_idx; |
2d2063ce | 2710 | int chunk_offset = sector_div(stripe, sectors_per_chunk); |
112bf897 | 2711 | int disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
2d2063ce | 2712 | |
112bf897 N |
2713 | raid5_compute_sector(conf, |
2714 | stripe * (disks - conf->max_degraded) | |
b875e531 | 2715 | *sectors_per_chunk + chunk_offset, |
112bf897 | 2716 | previous, |
911d4ee8 | 2717 | &dd_idx, sh); |
ccfcc3c1 N |
2718 | } |
2719 | ||
a4456856 | 2720 | static void |
d1688a6d | 2721 | handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh, |
a4456856 DW |
2722 | struct stripe_head_state *s, int disks, |
2723 | struct bio **return_bi) | |
2724 | { | |
2725 | int i; | |
2726 | for (i = disks; i--; ) { | |
2727 | struct bio *bi; | |
2728 | int bitmap_end = 0; | |
2729 | ||
2730 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { | |
3cb03002 | 2731 | struct md_rdev *rdev; |
a4456856 DW |
2732 | rcu_read_lock(); |
2733 | rdev = rcu_dereference(conf->disks[i].rdev); | |
2734 | if (rdev && test_bit(In_sync, &rdev->flags)) | |
7f0da59b N |
2735 | atomic_inc(&rdev->nr_pending); |
2736 | else | |
2737 | rdev = NULL; | |
a4456856 | 2738 | rcu_read_unlock(); |
7f0da59b N |
2739 | if (rdev) { |
2740 | if (!rdev_set_badblocks( | |
2741 | rdev, | |
2742 | sh->sector, | |
2743 | STRIPE_SECTORS, 0)) | |
2744 | md_error(conf->mddev, rdev); | |
2745 | rdev_dec_pending(rdev, conf->mddev); | |
2746 | } | |
a4456856 | 2747 | } |
b17459c0 | 2748 | spin_lock_irq(&sh->stripe_lock); |
a4456856 DW |
2749 | /* fail all writes first */ |
2750 | bi = sh->dev[i].towrite; | |
2751 | sh->dev[i].towrite = NULL; | |
b17459c0 | 2752 | spin_unlock_irq(&sh->stripe_lock); |
1ed850f3 | 2753 | if (bi) |
a4456856 | 2754 | bitmap_end = 1; |
a4456856 DW |
2755 | |
2756 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
2757 | wake_up(&conf->wait_for_overlap); | |
2758 | ||
4f024f37 | 2759 | while (bi && bi->bi_iter.bi_sector < |
a4456856 DW |
2760 | sh->dev[i].sector + STRIPE_SECTORS) { |
2761 | struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector); | |
2762 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
e7836bd6 | 2763 | if (!raid5_dec_bi_active_stripes(bi)) { |
a4456856 DW |
2764 | md_write_end(conf->mddev); |
2765 | bi->bi_next = *return_bi; | |
2766 | *return_bi = bi; | |
2767 | } | |
2768 | bi = nextbi; | |
2769 | } | |
7eaf7e8e SL |
2770 | if (bitmap_end) |
2771 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, | |
2772 | STRIPE_SECTORS, 0, 0); | |
2773 | bitmap_end = 0; | |
a4456856 DW |
2774 | /* and fail all 'written' */ |
2775 | bi = sh->dev[i].written; | |
2776 | sh->dev[i].written = NULL; | |
d592a996 SL |
2777 | if (test_and_clear_bit(R5_SkipCopy, &sh->dev[i].flags)) { |
2778 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
2779 | sh->dev[i].page = sh->dev[i].orig_page; | |
2780 | } | |
2781 | ||
a4456856 | 2782 | if (bi) bitmap_end = 1; |
4f024f37 | 2783 | while (bi && bi->bi_iter.bi_sector < |
a4456856 DW |
2784 | sh->dev[i].sector + STRIPE_SECTORS) { |
2785 | struct bio *bi2 = r5_next_bio(bi, sh->dev[i].sector); | |
2786 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
e7836bd6 | 2787 | if (!raid5_dec_bi_active_stripes(bi)) { |
a4456856 DW |
2788 | md_write_end(conf->mddev); |
2789 | bi->bi_next = *return_bi; | |
2790 | *return_bi = bi; | |
2791 | } | |
2792 | bi = bi2; | |
2793 | } | |
2794 | ||
b5e98d65 DW |
2795 | /* fail any reads if this device is non-operational and |
2796 | * the data has not reached the cache yet. | |
2797 | */ | |
2798 | if (!test_bit(R5_Wantfill, &sh->dev[i].flags) && | |
2799 | (!test_bit(R5_Insync, &sh->dev[i].flags) || | |
2800 | test_bit(R5_ReadError, &sh->dev[i].flags))) { | |
143c4d05 | 2801 | spin_lock_irq(&sh->stripe_lock); |
a4456856 DW |
2802 | bi = sh->dev[i].toread; |
2803 | sh->dev[i].toread = NULL; | |
143c4d05 | 2804 | spin_unlock_irq(&sh->stripe_lock); |
a4456856 DW |
2805 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) |
2806 | wake_up(&conf->wait_for_overlap); | |
4f024f37 | 2807 | while (bi && bi->bi_iter.bi_sector < |
a4456856 DW |
2808 | sh->dev[i].sector + STRIPE_SECTORS) { |
2809 | struct bio *nextbi = | |
2810 | r5_next_bio(bi, sh->dev[i].sector); | |
2811 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
e7836bd6 | 2812 | if (!raid5_dec_bi_active_stripes(bi)) { |
a4456856 DW |
2813 | bi->bi_next = *return_bi; |
2814 | *return_bi = bi; | |
2815 | } | |
2816 | bi = nextbi; | |
2817 | } | |
2818 | } | |
a4456856 DW |
2819 | if (bitmap_end) |
2820 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, | |
2821 | STRIPE_SECTORS, 0, 0); | |
8cfa7b0f N |
2822 | /* If we were in the middle of a write the parity block might |
2823 | * still be locked - so just clear all R5_LOCKED flags | |
2824 | */ | |
2825 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
a4456856 DW |
2826 | } |
2827 | ||
8b3e6cdc DW |
2828 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) |
2829 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
2830 | md_wakeup_thread(conf->mddev->thread); | |
a4456856 DW |
2831 | } |
2832 | ||
7f0da59b | 2833 | static void |
d1688a6d | 2834 | handle_failed_sync(struct r5conf *conf, struct stripe_head *sh, |
7f0da59b N |
2835 | struct stripe_head_state *s) |
2836 | { | |
2837 | int abort = 0; | |
2838 | int i; | |
2839 | ||
7f0da59b | 2840 | clear_bit(STRIPE_SYNCING, &sh->state); |
f8dfcffd N |
2841 | if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags)) |
2842 | wake_up(&conf->wait_for_overlap); | |
7f0da59b | 2843 | s->syncing = 0; |
9a3e1101 | 2844 | s->replacing = 0; |
7f0da59b | 2845 | /* There is nothing more to do for sync/check/repair. |
18b9837e N |
2846 | * Don't even need to abort as that is handled elsewhere |
2847 | * if needed, and not always wanted e.g. if there is a known | |
2848 | * bad block here. | |
9a3e1101 | 2849 | * For recover/replace we need to record a bad block on all |
7f0da59b N |
2850 | * non-sync devices, or abort the recovery |
2851 | */ | |
18b9837e N |
2852 | if (test_bit(MD_RECOVERY_RECOVER, &conf->mddev->recovery)) { |
2853 | /* During recovery devices cannot be removed, so | |
2854 | * locking and refcounting of rdevs is not needed | |
2855 | */ | |
2856 | for (i = 0; i < conf->raid_disks; i++) { | |
2857 | struct md_rdev *rdev = conf->disks[i].rdev; | |
2858 | if (rdev | |
2859 | && !test_bit(Faulty, &rdev->flags) | |
2860 | && !test_bit(In_sync, &rdev->flags) | |
2861 | && !rdev_set_badblocks(rdev, sh->sector, | |
2862 | STRIPE_SECTORS, 0)) | |
2863 | abort = 1; | |
2864 | rdev = conf->disks[i].replacement; | |
2865 | if (rdev | |
2866 | && !test_bit(Faulty, &rdev->flags) | |
2867 | && !test_bit(In_sync, &rdev->flags) | |
2868 | && !rdev_set_badblocks(rdev, sh->sector, | |
2869 | STRIPE_SECTORS, 0)) | |
2870 | abort = 1; | |
2871 | } | |
2872 | if (abort) | |
2873 | conf->recovery_disabled = | |
2874 | conf->mddev->recovery_disabled; | |
7f0da59b | 2875 | } |
18b9837e | 2876 | md_done_sync(conf->mddev, STRIPE_SECTORS, !abort); |
7f0da59b N |
2877 | } |
2878 | ||
9a3e1101 N |
2879 | static int want_replace(struct stripe_head *sh, int disk_idx) |
2880 | { | |
2881 | struct md_rdev *rdev; | |
2882 | int rv = 0; | |
2883 | /* Doing recovery so rcu locking not required */ | |
2884 | rdev = sh->raid_conf->disks[disk_idx].replacement; | |
2885 | if (rdev | |
2886 | && !test_bit(Faulty, &rdev->flags) | |
2887 | && !test_bit(In_sync, &rdev->flags) | |
2888 | && (rdev->recovery_offset <= sh->sector | |
2889 | || rdev->mddev->recovery_cp <= sh->sector)) | |
2890 | rv = 1; | |
2891 | ||
2892 | return rv; | |
2893 | } | |
2894 | ||
93b3dbce | 2895 | /* fetch_block - checks the given member device to see if its data needs |
1fe797e6 DW |
2896 | * to be read or computed to satisfy a request. |
2897 | * | |
2898 | * Returns 1 when no more member devices need to be checked, otherwise returns | |
93b3dbce | 2899 | * 0 to tell the loop in handle_stripe_fill to continue |
f38e1219 | 2900 | */ |
93b3dbce N |
2901 | static int fetch_block(struct stripe_head *sh, struct stripe_head_state *s, |
2902 | int disk_idx, int disks) | |
a4456856 | 2903 | { |
5599becc | 2904 | struct r5dev *dev = &sh->dev[disk_idx]; |
f2b3b44d N |
2905 | struct r5dev *fdev[2] = { &sh->dev[s->failed_num[0]], |
2906 | &sh->dev[s->failed_num[1]] }; | |
5599becc | 2907 | |
93b3dbce | 2908 | /* is the data in this block needed, and can we get it? */ |
5599becc YT |
2909 | if (!test_bit(R5_LOCKED, &dev->flags) && |
2910 | !test_bit(R5_UPTODATE, &dev->flags) && | |
2911 | (dev->toread || | |
2912 | (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags)) || | |
2913 | s->syncing || s->expanding || | |
9a3e1101 | 2914 | (s->replacing && want_replace(sh, disk_idx)) || |
5d35e09c N |
2915 | (s->failed >= 1 && fdev[0]->toread) || |
2916 | (s->failed >= 2 && fdev[1]->toread) || | |
93b3dbce | 2917 | (sh->raid_conf->level <= 5 && s->failed && fdev[0]->towrite && |
67f45548 | 2918 | (!test_bit(R5_Insync, &dev->flags) || test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) && |
93b3dbce | 2919 | !test_bit(R5_OVERWRITE, &fdev[0]->flags)) || |
108cef3a N |
2920 | ((sh->raid_conf->level == 6 || |
2921 | sh->sector >= sh->raid_conf->mddev->recovery_cp) | |
2922 | && s->failed && s->to_write && | |
2923 | (s->to_write - s->non_overwrite < | |
2924 | sh->raid_conf->raid_disks - sh->raid_conf->max_degraded) && | |
67f45548 | 2925 | (!test_bit(R5_Insync, &dev->flags) || test_bit(STRIPE_PREREAD_ACTIVE, &sh->state))))) { |
5599becc YT |
2926 | /* we would like to get this block, possibly by computing it, |
2927 | * otherwise read it if the backing disk is insync | |
2928 | */ | |
2929 | BUG_ON(test_bit(R5_Wantcompute, &dev->flags)); | |
2930 | BUG_ON(test_bit(R5_Wantread, &dev->flags)); | |
2931 | if ((s->uptodate == disks - 1) && | |
f2b3b44d N |
2932 | (s->failed && (disk_idx == s->failed_num[0] || |
2933 | disk_idx == s->failed_num[1]))) { | |
5599becc YT |
2934 | /* have disk failed, and we're requested to fetch it; |
2935 | * do compute it | |
a4456856 | 2936 | */ |
5599becc YT |
2937 | pr_debug("Computing stripe %llu block %d\n", |
2938 | (unsigned long long)sh->sector, disk_idx); | |
2939 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
2940 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
2941 | set_bit(R5_Wantcompute, &dev->flags); | |
2942 | sh->ops.target = disk_idx; | |
2943 | sh->ops.target2 = -1; /* no 2nd target */ | |
2944 | s->req_compute = 1; | |
93b3dbce N |
2945 | /* Careful: from this point on 'uptodate' is in the eye |
2946 | * of raid_run_ops which services 'compute' operations | |
2947 | * before writes. R5_Wantcompute flags a block that will | |
2948 | * be R5_UPTODATE by the time it is needed for a | |
2949 | * subsequent operation. | |
2950 | */ | |
5599becc YT |
2951 | s->uptodate++; |
2952 | return 1; | |
2953 | } else if (s->uptodate == disks-2 && s->failed >= 2) { | |
2954 | /* Computing 2-failure is *very* expensive; only | |
2955 | * do it if failed >= 2 | |
2956 | */ | |
2957 | int other; | |
2958 | for (other = disks; other--; ) { | |
2959 | if (other == disk_idx) | |
2960 | continue; | |
2961 | if (!test_bit(R5_UPTODATE, | |
2962 | &sh->dev[other].flags)) | |
2963 | break; | |
a4456856 | 2964 | } |
5599becc YT |
2965 | BUG_ON(other < 0); |
2966 | pr_debug("Computing stripe %llu blocks %d,%d\n", | |
2967 | (unsigned long long)sh->sector, | |
2968 | disk_idx, other); | |
2969 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
2970 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
2971 | set_bit(R5_Wantcompute, &sh->dev[disk_idx].flags); | |
2972 | set_bit(R5_Wantcompute, &sh->dev[other].flags); | |
2973 | sh->ops.target = disk_idx; | |
2974 | sh->ops.target2 = other; | |
2975 | s->uptodate += 2; | |
2976 | s->req_compute = 1; | |
2977 | return 1; | |
2978 | } else if (test_bit(R5_Insync, &dev->flags)) { | |
2979 | set_bit(R5_LOCKED, &dev->flags); | |
2980 | set_bit(R5_Wantread, &dev->flags); | |
2981 | s->locked++; | |
2982 | pr_debug("Reading block %d (sync=%d)\n", | |
2983 | disk_idx, s->syncing); | |
a4456856 DW |
2984 | } |
2985 | } | |
5599becc YT |
2986 | |
2987 | return 0; | |
2988 | } | |
2989 | ||
2990 | /** | |
93b3dbce | 2991 | * handle_stripe_fill - read or compute data to satisfy pending requests. |
5599becc | 2992 | */ |
93b3dbce N |
2993 | static void handle_stripe_fill(struct stripe_head *sh, |
2994 | struct stripe_head_state *s, | |
2995 | int disks) | |
5599becc YT |
2996 | { |
2997 | int i; | |
2998 | ||
2999 | /* look for blocks to read/compute, skip this if a compute | |
3000 | * is already in flight, or if the stripe contents are in the | |
3001 | * midst of changing due to a write | |
3002 | */ | |
3003 | if (!test_bit(STRIPE_COMPUTE_RUN, &sh->state) && !sh->check_state && | |
3004 | !sh->reconstruct_state) | |
3005 | for (i = disks; i--; ) | |
93b3dbce | 3006 | if (fetch_block(sh, s, i, disks)) |
5599becc | 3007 | break; |
a4456856 DW |
3008 | set_bit(STRIPE_HANDLE, &sh->state); |
3009 | } | |
3010 | ||
1fe797e6 | 3011 | /* handle_stripe_clean_event |
a4456856 DW |
3012 | * any written block on an uptodate or failed drive can be returned. |
3013 | * Note that if we 'wrote' to a failed drive, it will be UPTODATE, but | |
3014 | * never LOCKED, so we don't need to test 'failed' directly. | |
3015 | */ | |
d1688a6d | 3016 | static void handle_stripe_clean_event(struct r5conf *conf, |
a4456856 DW |
3017 | struct stripe_head *sh, int disks, struct bio **return_bi) |
3018 | { | |
3019 | int i; | |
3020 | struct r5dev *dev; | |
f8dfcffd | 3021 | int discard_pending = 0; |
a4456856 DW |
3022 | |
3023 | for (i = disks; i--; ) | |
3024 | if (sh->dev[i].written) { | |
3025 | dev = &sh->dev[i]; | |
3026 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
9e444768 | 3027 | (test_bit(R5_UPTODATE, &dev->flags) || |
d592a996 SL |
3028 | test_bit(R5_Discard, &dev->flags) || |
3029 | test_bit(R5_SkipCopy, &dev->flags))) { | |
a4456856 DW |
3030 | /* We can return any write requests */ |
3031 | struct bio *wbi, *wbi2; | |
45b4233c | 3032 | pr_debug("Return write for disc %d\n", i); |
ca64cae9 N |
3033 | if (test_and_clear_bit(R5_Discard, &dev->flags)) |
3034 | clear_bit(R5_UPTODATE, &dev->flags); | |
d592a996 SL |
3035 | if (test_and_clear_bit(R5_SkipCopy, &dev->flags)) { |
3036 | WARN_ON(test_bit(R5_UPTODATE, &dev->flags)); | |
3037 | dev->page = dev->orig_page; | |
3038 | } | |
a4456856 DW |
3039 | wbi = dev->written; |
3040 | dev->written = NULL; | |
4f024f37 | 3041 | while (wbi && wbi->bi_iter.bi_sector < |
a4456856 DW |
3042 | dev->sector + STRIPE_SECTORS) { |
3043 | wbi2 = r5_next_bio(wbi, dev->sector); | |
e7836bd6 | 3044 | if (!raid5_dec_bi_active_stripes(wbi)) { |
a4456856 DW |
3045 | md_write_end(conf->mddev); |
3046 | wbi->bi_next = *return_bi; | |
3047 | *return_bi = wbi; | |
3048 | } | |
3049 | wbi = wbi2; | |
3050 | } | |
7eaf7e8e SL |
3051 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, |
3052 | STRIPE_SECTORS, | |
a4456856 | 3053 | !test_bit(STRIPE_DEGRADED, &sh->state), |
7eaf7e8e | 3054 | 0); |
f8dfcffd N |
3055 | } else if (test_bit(R5_Discard, &dev->flags)) |
3056 | discard_pending = 1; | |
d592a996 SL |
3057 | WARN_ON(test_bit(R5_SkipCopy, &dev->flags)); |
3058 | WARN_ON(dev->page != dev->orig_page); | |
f8dfcffd N |
3059 | } |
3060 | if (!discard_pending && | |
3061 | test_bit(R5_Discard, &sh->dev[sh->pd_idx].flags)) { | |
3062 | clear_bit(R5_Discard, &sh->dev[sh->pd_idx].flags); | |
3063 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); | |
3064 | if (sh->qd_idx >= 0) { | |
3065 | clear_bit(R5_Discard, &sh->dev[sh->qd_idx].flags); | |
3066 | clear_bit(R5_UPTODATE, &sh->dev[sh->qd_idx].flags); | |
3067 | } | |
3068 | /* now that discard is done we can proceed with any sync */ | |
3069 | clear_bit(STRIPE_DISCARD, &sh->state); | |
d47648fc SL |
3070 | /* |
3071 | * SCSI discard will change some bio fields and the stripe has | |
3072 | * no updated data, so remove it from hash list and the stripe | |
3073 | * will be reinitialized | |
3074 | */ | |
3075 | spin_lock_irq(&conf->device_lock); | |
3076 | remove_hash(sh); | |
3077 | spin_unlock_irq(&conf->device_lock); | |
f8dfcffd N |
3078 | if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state)) |
3079 | set_bit(STRIPE_HANDLE, &sh->state); | |
3080 | ||
3081 | } | |
8b3e6cdc DW |
3082 | |
3083 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) | |
3084 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
3085 | md_wakeup_thread(conf->mddev->thread); | |
a4456856 DW |
3086 | } |
3087 | ||
d1688a6d | 3088 | static void handle_stripe_dirtying(struct r5conf *conf, |
c8ac1803 N |
3089 | struct stripe_head *sh, |
3090 | struct stripe_head_state *s, | |
3091 | int disks) | |
a4456856 DW |
3092 | { |
3093 | int rmw = 0, rcw = 0, i; | |
a7854487 AL |
3094 | sector_t recovery_cp = conf->mddev->recovery_cp; |
3095 | ||
3096 | /* RAID6 requires 'rcw' in current implementation. | |
3097 | * Otherwise, check whether resync is now happening or should start. | |
3098 | * If yes, then the array is dirty (after unclean shutdown or | |
3099 | * initial creation), so parity in some stripes might be inconsistent. | |
3100 | * In this case, we need to always do reconstruct-write, to ensure | |
3101 | * that in case of drive failure or read-error correction, we | |
3102 | * generate correct data from the parity. | |
3103 | */ | |
3104 | if (conf->max_degraded == 2 || | |
3105 | (recovery_cp < MaxSector && sh->sector >= recovery_cp)) { | |
3106 | /* Calculate the real rcw later - for now make it | |
c8ac1803 N |
3107 | * look like rcw is cheaper |
3108 | */ | |
3109 | rcw = 1; rmw = 2; | |
a7854487 AL |
3110 | pr_debug("force RCW max_degraded=%u, recovery_cp=%llu sh->sector=%llu\n", |
3111 | conf->max_degraded, (unsigned long long)recovery_cp, | |
3112 | (unsigned long long)sh->sector); | |
c8ac1803 | 3113 | } else for (i = disks; i--; ) { |
a4456856 DW |
3114 | /* would I have to read this buffer for read_modify_write */ |
3115 | struct r5dev *dev = &sh->dev[i]; | |
3116 | if ((dev->towrite || i == sh->pd_idx) && | |
3117 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
3118 | !(test_bit(R5_UPTODATE, &dev->flags) || |
3119 | test_bit(R5_Wantcompute, &dev->flags))) { | |
a4456856 DW |
3120 | if (test_bit(R5_Insync, &dev->flags)) |
3121 | rmw++; | |
3122 | else | |
3123 | rmw += 2*disks; /* cannot read it */ | |
3124 | } | |
3125 | /* Would I have to read this buffer for reconstruct_write */ | |
3126 | if (!test_bit(R5_OVERWRITE, &dev->flags) && i != sh->pd_idx && | |
3127 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
3128 | !(test_bit(R5_UPTODATE, &dev->flags) || |
3129 | test_bit(R5_Wantcompute, &dev->flags))) { | |
67f45548 N |
3130 | if (test_bit(R5_Insync, &dev->flags)) |
3131 | rcw++; | |
a4456856 DW |
3132 | else |
3133 | rcw += 2*disks; | |
3134 | } | |
3135 | } | |
45b4233c | 3136 | pr_debug("for sector %llu, rmw=%d rcw=%d\n", |
a4456856 DW |
3137 | (unsigned long long)sh->sector, rmw, rcw); |
3138 | set_bit(STRIPE_HANDLE, &sh->state); | |
a9add5d9 | 3139 | if (rmw < rcw && rmw > 0) { |
a4456856 | 3140 | /* prefer read-modify-write, but need to get some data */ |
e3620a3a JB |
3141 | if (conf->mddev->queue) |
3142 | blk_add_trace_msg(conf->mddev->queue, | |
3143 | "raid5 rmw %llu %d", | |
3144 | (unsigned long long)sh->sector, rmw); | |
a4456856 DW |
3145 | for (i = disks; i--; ) { |
3146 | struct r5dev *dev = &sh->dev[i]; | |
3147 | if ((dev->towrite || i == sh->pd_idx) && | |
3148 | !test_bit(R5_LOCKED, &dev->flags) && | |
f38e1219 DW |
3149 | !(test_bit(R5_UPTODATE, &dev->flags) || |
3150 | test_bit(R5_Wantcompute, &dev->flags)) && | |
a4456856 | 3151 | test_bit(R5_Insync, &dev->flags)) { |
67f45548 N |
3152 | if (test_bit(STRIPE_PREREAD_ACTIVE, |
3153 | &sh->state)) { | |
3154 | pr_debug("Read_old block %d for r-m-w\n", | |
3155 | i); | |
a4456856 DW |
3156 | set_bit(R5_LOCKED, &dev->flags); |
3157 | set_bit(R5_Wantread, &dev->flags); | |
3158 | s->locked++; | |
3159 | } else { | |
3160 | set_bit(STRIPE_DELAYED, &sh->state); | |
3161 | set_bit(STRIPE_HANDLE, &sh->state); | |
3162 | } | |
3163 | } | |
3164 | } | |
a9add5d9 | 3165 | } |
c8ac1803 | 3166 | if (rcw <= rmw && rcw > 0) { |
a4456856 | 3167 | /* want reconstruct write, but need to get some data */ |
a9add5d9 | 3168 | int qread =0; |
c8ac1803 | 3169 | rcw = 0; |
a4456856 DW |
3170 | for (i = disks; i--; ) { |
3171 | struct r5dev *dev = &sh->dev[i]; | |
3172 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
c8ac1803 | 3173 | i != sh->pd_idx && i != sh->qd_idx && |
a4456856 | 3174 | !test_bit(R5_LOCKED, &dev->flags) && |
f38e1219 | 3175 | !(test_bit(R5_UPTODATE, &dev->flags) || |
c8ac1803 N |
3176 | test_bit(R5_Wantcompute, &dev->flags))) { |
3177 | rcw++; | |
67f45548 N |
3178 | if (test_bit(R5_Insync, &dev->flags) && |
3179 | test_bit(STRIPE_PREREAD_ACTIVE, | |
3180 | &sh->state)) { | |
45b4233c | 3181 | pr_debug("Read_old block " |
a4456856 DW |
3182 | "%d for Reconstruct\n", i); |
3183 | set_bit(R5_LOCKED, &dev->flags); | |
3184 | set_bit(R5_Wantread, &dev->flags); | |
3185 | s->locked++; | |
a9add5d9 | 3186 | qread++; |
a4456856 DW |
3187 | } else { |
3188 | set_bit(STRIPE_DELAYED, &sh->state); | |
3189 | set_bit(STRIPE_HANDLE, &sh->state); | |
3190 | } | |
3191 | } | |
3192 | } | |
e3620a3a | 3193 | if (rcw && conf->mddev->queue) |
a9add5d9 N |
3194 | blk_add_trace_msg(conf->mddev->queue, "raid5 rcw %llu %d %d %d", |
3195 | (unsigned long long)sh->sector, | |
3196 | rcw, qread, test_bit(STRIPE_DELAYED, &sh->state)); | |
c8ac1803 | 3197 | } |
a4456856 DW |
3198 | /* now if nothing is locked, and if we have enough data, |
3199 | * we can start a write request | |
3200 | */ | |
f38e1219 DW |
3201 | /* since handle_stripe can be called at any time we need to handle the |
3202 | * case where a compute block operation has been submitted and then a | |
ac6b53b6 DW |
3203 | * subsequent call wants to start a write request. raid_run_ops only |
3204 | * handles the case where compute block and reconstruct are requested | |
f38e1219 DW |
3205 | * simultaneously. If this is not the case then new writes need to be |
3206 | * held off until the compute completes. | |
3207 | */ | |
976ea8d4 DW |
3208 | if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) && |
3209 | (s->locked == 0 && (rcw == 0 || rmw == 0) && | |
3210 | !test_bit(STRIPE_BIT_DELAY, &sh->state))) | |
c0f7bddb | 3211 | schedule_reconstruction(sh, s, rcw == 0, 0); |
a4456856 DW |
3212 | } |
3213 | ||
d1688a6d | 3214 | static void handle_parity_checks5(struct r5conf *conf, struct stripe_head *sh, |
a4456856 DW |
3215 | struct stripe_head_state *s, int disks) |
3216 | { | |
ecc65c9b | 3217 | struct r5dev *dev = NULL; |
bd2ab670 | 3218 | |
a4456856 | 3219 | set_bit(STRIPE_HANDLE, &sh->state); |
e89f8962 | 3220 | |
ecc65c9b DW |
3221 | switch (sh->check_state) { |
3222 | case check_state_idle: | |
3223 | /* start a new check operation if there are no failures */ | |
bd2ab670 | 3224 | if (s->failed == 0) { |
bd2ab670 | 3225 | BUG_ON(s->uptodate != disks); |
ecc65c9b DW |
3226 | sh->check_state = check_state_run; |
3227 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
bd2ab670 | 3228 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); |
bd2ab670 | 3229 | s->uptodate--; |
ecc65c9b | 3230 | break; |
bd2ab670 | 3231 | } |
f2b3b44d | 3232 | dev = &sh->dev[s->failed_num[0]]; |
ecc65c9b DW |
3233 | /* fall through */ |
3234 | case check_state_compute_result: | |
3235 | sh->check_state = check_state_idle; | |
3236 | if (!dev) | |
3237 | dev = &sh->dev[sh->pd_idx]; | |
3238 | ||
3239 | /* check that a write has not made the stripe insync */ | |
3240 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
3241 | break; | |
c8894419 | 3242 | |
a4456856 | 3243 | /* either failed parity check, or recovery is happening */ |
a4456856 DW |
3244 | BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)); |
3245 | BUG_ON(s->uptodate != disks); | |
3246 | ||
3247 | set_bit(R5_LOCKED, &dev->flags); | |
ecc65c9b | 3248 | s->locked++; |
a4456856 | 3249 | set_bit(R5_Wantwrite, &dev->flags); |
830ea016 | 3250 | |
a4456856 | 3251 | clear_bit(STRIPE_DEGRADED, &sh->state); |
a4456856 | 3252 | set_bit(STRIPE_INSYNC, &sh->state); |
ecc65c9b DW |
3253 | break; |
3254 | case check_state_run: | |
3255 | break; /* we will be called again upon completion */ | |
3256 | case check_state_check_result: | |
3257 | sh->check_state = check_state_idle; | |
3258 | ||
3259 | /* if a failure occurred during the check operation, leave | |
3260 | * STRIPE_INSYNC not set and let the stripe be handled again | |
3261 | */ | |
3262 | if (s->failed) | |
3263 | break; | |
3264 | ||
3265 | /* handle a successful check operation, if parity is correct | |
3266 | * we are done. Otherwise update the mismatch count and repair | |
3267 | * parity if !MD_RECOVERY_CHECK | |
3268 | */ | |
ad283ea4 | 3269 | if ((sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) == 0) |
ecc65c9b DW |
3270 | /* parity is correct (on disc, |
3271 | * not in buffer any more) | |
3272 | */ | |
3273 | set_bit(STRIPE_INSYNC, &sh->state); | |
3274 | else { | |
7f7583d4 | 3275 | atomic64_add(STRIPE_SECTORS, &conf->mddev->resync_mismatches); |
ecc65c9b DW |
3276 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) |
3277 | /* don't try to repair!! */ | |
3278 | set_bit(STRIPE_INSYNC, &sh->state); | |
3279 | else { | |
3280 | sh->check_state = check_state_compute_run; | |
976ea8d4 | 3281 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); |
ecc65c9b DW |
3282 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); |
3283 | set_bit(R5_Wantcompute, | |
3284 | &sh->dev[sh->pd_idx].flags); | |
3285 | sh->ops.target = sh->pd_idx; | |
ac6b53b6 | 3286 | sh->ops.target2 = -1; |
ecc65c9b DW |
3287 | s->uptodate++; |
3288 | } | |
3289 | } | |
3290 | break; | |
3291 | case check_state_compute_run: | |
3292 | break; | |
3293 | default: | |
3294 | printk(KERN_ERR "%s: unknown check_state: %d sector: %llu\n", | |
3295 | __func__, sh->check_state, | |
3296 | (unsigned long long) sh->sector); | |
3297 | BUG(); | |
a4456856 DW |
3298 | } |
3299 | } | |
3300 | ||
d1688a6d | 3301 | static void handle_parity_checks6(struct r5conf *conf, struct stripe_head *sh, |
36d1c647 | 3302 | struct stripe_head_state *s, |
f2b3b44d | 3303 | int disks) |
a4456856 | 3304 | { |
a4456856 | 3305 | int pd_idx = sh->pd_idx; |
34e04e87 | 3306 | int qd_idx = sh->qd_idx; |
d82dfee0 | 3307 | struct r5dev *dev; |
a4456856 DW |
3308 | |
3309 | set_bit(STRIPE_HANDLE, &sh->state); | |
3310 | ||
3311 | BUG_ON(s->failed > 2); | |
d82dfee0 | 3312 | |
a4456856 DW |
3313 | /* Want to check and possibly repair P and Q. |
3314 | * However there could be one 'failed' device, in which | |
3315 | * case we can only check one of them, possibly using the | |
3316 | * other to generate missing data | |
3317 | */ | |
3318 | ||
d82dfee0 DW |
3319 | switch (sh->check_state) { |
3320 | case check_state_idle: | |
3321 | /* start a new check operation if there are < 2 failures */ | |
f2b3b44d | 3322 | if (s->failed == s->q_failed) { |
d82dfee0 | 3323 | /* The only possible failed device holds Q, so it |
a4456856 DW |
3324 | * makes sense to check P (If anything else were failed, |
3325 | * we would have used P to recreate it). | |
3326 | */ | |
d82dfee0 | 3327 | sh->check_state = check_state_run; |
a4456856 | 3328 | } |
f2b3b44d | 3329 | if (!s->q_failed && s->failed < 2) { |
d82dfee0 | 3330 | /* Q is not failed, and we didn't use it to generate |
a4456856 DW |
3331 | * anything, so it makes sense to check it |
3332 | */ | |
d82dfee0 DW |
3333 | if (sh->check_state == check_state_run) |
3334 | sh->check_state = check_state_run_pq; | |
3335 | else | |
3336 | sh->check_state = check_state_run_q; | |
a4456856 | 3337 | } |
a4456856 | 3338 | |
d82dfee0 DW |
3339 | /* discard potentially stale zero_sum_result */ |
3340 | sh->ops.zero_sum_result = 0; | |
a4456856 | 3341 | |
d82dfee0 DW |
3342 | if (sh->check_state == check_state_run) { |
3343 | /* async_xor_zero_sum destroys the contents of P */ | |
3344 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
3345 | s->uptodate--; | |
a4456856 | 3346 | } |
d82dfee0 DW |
3347 | if (sh->check_state >= check_state_run && |
3348 | sh->check_state <= check_state_run_pq) { | |
3349 | /* async_syndrome_zero_sum preserves P and Q, so | |
3350 | * no need to mark them !uptodate here | |
3351 | */ | |
3352 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
3353 | break; | |
a4456856 DW |
3354 | } |
3355 | ||
d82dfee0 DW |
3356 | /* we have 2-disk failure */ |
3357 | BUG_ON(s->failed != 2); | |
3358 | /* fall through */ | |
3359 | case check_state_compute_result: | |
3360 | sh->check_state = check_state_idle; | |
a4456856 | 3361 | |
d82dfee0 DW |
3362 | /* check that a write has not made the stripe insync */ |
3363 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
3364 | break; | |
a4456856 DW |
3365 | |
3366 | /* now write out any block on a failed drive, | |
d82dfee0 | 3367 | * or P or Q if they were recomputed |
a4456856 | 3368 | */ |
d82dfee0 | 3369 | BUG_ON(s->uptodate < disks - 1); /* We don't need Q to recover */ |
a4456856 | 3370 | if (s->failed == 2) { |
f2b3b44d | 3371 | dev = &sh->dev[s->failed_num[1]]; |
a4456856 DW |
3372 | s->locked++; |
3373 | set_bit(R5_LOCKED, &dev->flags); | |
3374 | set_bit(R5_Wantwrite, &dev->flags); | |
3375 | } | |
3376 | if (s->failed >= 1) { | |
f2b3b44d | 3377 | dev = &sh->dev[s->failed_num[0]]; |
a4456856 DW |
3378 | s->locked++; |
3379 | set_bit(R5_LOCKED, &dev->flags); | |
3380 | set_bit(R5_Wantwrite, &dev->flags); | |
3381 | } | |
d82dfee0 | 3382 | if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { |
a4456856 DW |
3383 | dev = &sh->dev[pd_idx]; |
3384 | s->locked++; | |
3385 | set_bit(R5_LOCKED, &dev->flags); | |
3386 | set_bit(R5_Wantwrite, &dev->flags); | |
3387 | } | |
d82dfee0 | 3388 | if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { |
a4456856 DW |
3389 | dev = &sh->dev[qd_idx]; |
3390 | s->locked++; | |
3391 | set_bit(R5_LOCKED, &dev->flags); | |
3392 | set_bit(R5_Wantwrite, &dev->flags); | |
3393 | } | |
3394 | clear_bit(STRIPE_DEGRADED, &sh->state); | |
3395 | ||
3396 | set_bit(STRIPE_INSYNC, &sh->state); | |
d82dfee0 DW |
3397 | break; |
3398 | case check_state_run: | |
3399 | case check_state_run_q: | |
3400 | case check_state_run_pq: | |
3401 | break; /* we will be called again upon completion */ | |
3402 | case check_state_check_result: | |
3403 | sh->check_state = check_state_idle; | |
3404 | ||
3405 | /* handle a successful check operation, if parity is correct | |
3406 | * we are done. Otherwise update the mismatch count and repair | |
3407 | * parity if !MD_RECOVERY_CHECK | |
3408 | */ | |
3409 | if (sh->ops.zero_sum_result == 0) { | |
3410 | /* both parities are correct */ | |
3411 | if (!s->failed) | |
3412 | set_bit(STRIPE_INSYNC, &sh->state); | |
3413 | else { | |
3414 | /* in contrast to the raid5 case we can validate | |
3415 | * parity, but still have a failure to write | |
3416 | * back | |
3417 | */ | |
3418 | sh->check_state = check_state_compute_result; | |
3419 | /* Returning at this point means that we may go | |
3420 | * off and bring p and/or q uptodate again so | |
3421 | * we make sure to check zero_sum_result again | |
3422 | * to verify if p or q need writeback | |
3423 | */ | |
3424 | } | |
3425 | } else { | |
7f7583d4 | 3426 | atomic64_add(STRIPE_SECTORS, &conf->mddev->resync_mismatches); |
d82dfee0 DW |
3427 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) |
3428 | /* don't try to repair!! */ | |
3429 | set_bit(STRIPE_INSYNC, &sh->state); | |
3430 | else { | |
3431 | int *target = &sh->ops.target; | |
3432 | ||
3433 | sh->ops.target = -1; | |
3434 | sh->ops.target2 = -1; | |
3435 | sh->check_state = check_state_compute_run; | |
3436 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
3437 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
3438 | if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { | |
3439 | set_bit(R5_Wantcompute, | |
3440 | &sh->dev[pd_idx].flags); | |
3441 | *target = pd_idx; | |
3442 | target = &sh->ops.target2; | |
3443 | s->uptodate++; | |
3444 | } | |
3445 | if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { | |
3446 | set_bit(R5_Wantcompute, | |
3447 | &sh->dev[qd_idx].flags); | |
3448 | *target = qd_idx; | |
3449 | s->uptodate++; | |
3450 | } | |
3451 | } | |
3452 | } | |
3453 | break; | |
3454 | case check_state_compute_run: | |
3455 | break; | |
3456 | default: | |
3457 | printk(KERN_ERR "%s: unknown check_state: %d sector: %llu\n", | |
3458 | __func__, sh->check_state, | |
3459 | (unsigned long long) sh->sector); | |
3460 | BUG(); | |
a4456856 DW |
3461 | } |
3462 | } | |
3463 | ||
d1688a6d | 3464 | static void handle_stripe_expansion(struct r5conf *conf, struct stripe_head *sh) |
a4456856 DW |
3465 | { |
3466 | int i; | |
3467 | ||
3468 | /* We have read all the blocks in this stripe and now we need to | |
3469 | * copy some of them into a target stripe for expand. | |
3470 | */ | |
f0a50d37 | 3471 | struct dma_async_tx_descriptor *tx = NULL; |
a4456856 DW |
3472 | clear_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
3473 | for (i = 0; i < sh->disks; i++) | |
34e04e87 | 3474 | if (i != sh->pd_idx && i != sh->qd_idx) { |
911d4ee8 | 3475 | int dd_idx, j; |
a4456856 | 3476 | struct stripe_head *sh2; |
a08abd8c | 3477 | struct async_submit_ctl submit; |
a4456856 | 3478 | |
784052ec | 3479 | sector_t bn = compute_blocknr(sh, i, 1); |
911d4ee8 N |
3480 | sector_t s = raid5_compute_sector(conf, bn, 0, |
3481 | &dd_idx, NULL); | |
a8c906ca | 3482 | sh2 = get_active_stripe(conf, s, 0, 1, 1); |
a4456856 DW |
3483 | if (sh2 == NULL) |
3484 | /* so far only the early blocks of this stripe | |
3485 | * have been requested. When later blocks | |
3486 | * get requested, we will try again | |
3487 | */ | |
3488 | continue; | |
3489 | if (!test_bit(STRIPE_EXPANDING, &sh2->state) || | |
3490 | test_bit(R5_Expanded, &sh2->dev[dd_idx].flags)) { | |
3491 | /* must have already done this block */ | |
3492 | release_stripe(sh2); | |
3493 | continue; | |
3494 | } | |
f0a50d37 DW |
3495 | |
3496 | /* place all the copies on one channel */ | |
a08abd8c | 3497 | init_async_submit(&submit, 0, tx, NULL, NULL, NULL); |
f0a50d37 | 3498 | tx = async_memcpy(sh2->dev[dd_idx].page, |
88ba2aa5 | 3499 | sh->dev[i].page, 0, 0, STRIPE_SIZE, |
a08abd8c | 3500 | &submit); |
f0a50d37 | 3501 | |
a4456856 DW |
3502 | set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); |
3503 | set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); | |
3504 | for (j = 0; j < conf->raid_disks; j++) | |
3505 | if (j != sh2->pd_idx && | |
86c374ba | 3506 | j != sh2->qd_idx && |
a4456856 DW |
3507 | !test_bit(R5_Expanded, &sh2->dev[j].flags)) |
3508 | break; | |
3509 | if (j == conf->raid_disks) { | |
3510 | set_bit(STRIPE_EXPAND_READY, &sh2->state); | |
3511 | set_bit(STRIPE_HANDLE, &sh2->state); | |
3512 | } | |
3513 | release_stripe(sh2); | |
f0a50d37 | 3514 | |
a4456856 | 3515 | } |
a2e08551 | 3516 | /* done submitting copies, wait for them to complete */ |
749586b7 | 3517 | async_tx_quiesce(&tx); |
a4456856 | 3518 | } |
1da177e4 LT |
3519 | |
3520 | /* | |
3521 | * handle_stripe - do things to a stripe. | |
3522 | * | |
9a3e1101 N |
3523 | * We lock the stripe by setting STRIPE_ACTIVE and then examine the |
3524 | * state of various bits to see what needs to be done. | |
1da177e4 | 3525 | * Possible results: |
9a3e1101 N |
3526 | * return some read requests which now have data |
3527 | * return some write requests which are safely on storage | |
1da177e4 LT |
3528 | * schedule a read on some buffers |
3529 | * schedule a write of some buffers | |
3530 | * return confirmation of parity correctness | |
3531 | * | |
1da177e4 | 3532 | */ |
a4456856 | 3533 | |
acfe726b | 3534 | static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s) |
1da177e4 | 3535 | { |
d1688a6d | 3536 | struct r5conf *conf = sh->raid_conf; |
f416885e | 3537 | int disks = sh->disks; |
474af965 N |
3538 | struct r5dev *dev; |
3539 | int i; | |
9a3e1101 | 3540 | int do_recovery = 0; |
1da177e4 | 3541 | |
acfe726b N |
3542 | memset(s, 0, sizeof(*s)); |
3543 | ||
acfe726b N |
3544 | s->expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
3545 | s->expanded = test_bit(STRIPE_EXPAND_READY, &sh->state); | |
3546 | s->failed_num[0] = -1; | |
3547 | s->failed_num[1] = -1; | |
1da177e4 | 3548 | |
acfe726b | 3549 | /* Now to look around and see what can be done */ |
1da177e4 | 3550 | rcu_read_lock(); |
16a53ecc | 3551 | for (i=disks; i--; ) { |
3cb03002 | 3552 | struct md_rdev *rdev; |
31c176ec N |
3553 | sector_t first_bad; |
3554 | int bad_sectors; | |
3555 | int is_bad = 0; | |
acfe726b | 3556 | |
16a53ecc | 3557 | dev = &sh->dev[i]; |
1da177e4 | 3558 | |
45b4233c | 3559 | pr_debug("check %d: state 0x%lx read %p write %p written %p\n", |
9a3e1101 N |
3560 | i, dev->flags, |
3561 | dev->toread, dev->towrite, dev->written); | |
6c0069c0 YT |
3562 | /* maybe we can reply to a read |
3563 | * | |
3564 | * new wantfill requests are only permitted while | |
3565 | * ops_complete_biofill is guaranteed to be inactive | |
3566 | */ | |
3567 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread && | |
3568 | !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) | |
3569 | set_bit(R5_Wantfill, &dev->flags); | |
1da177e4 | 3570 | |
16a53ecc | 3571 | /* now count some things */ |
cc94015a N |
3572 | if (test_bit(R5_LOCKED, &dev->flags)) |
3573 | s->locked++; | |
3574 | if (test_bit(R5_UPTODATE, &dev->flags)) | |
3575 | s->uptodate++; | |
2d6e4ecc | 3576 | if (test_bit(R5_Wantcompute, &dev->flags)) { |
cc94015a N |
3577 | s->compute++; |
3578 | BUG_ON(s->compute > 2); | |
2d6e4ecc | 3579 | } |
1da177e4 | 3580 | |
acfe726b | 3581 | if (test_bit(R5_Wantfill, &dev->flags)) |
cc94015a | 3582 | s->to_fill++; |
acfe726b | 3583 | else if (dev->toread) |
cc94015a | 3584 | s->to_read++; |
16a53ecc | 3585 | if (dev->towrite) { |
cc94015a | 3586 | s->to_write++; |
16a53ecc | 3587 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
cc94015a | 3588 | s->non_overwrite++; |
16a53ecc | 3589 | } |
a4456856 | 3590 | if (dev->written) |
cc94015a | 3591 | s->written++; |
14a75d3e N |
3592 | /* Prefer to use the replacement for reads, but only |
3593 | * if it is recovered enough and has no bad blocks. | |
3594 | */ | |
3595 | rdev = rcu_dereference(conf->disks[i].replacement); | |
3596 | if (rdev && !test_bit(Faulty, &rdev->flags) && | |
3597 | rdev->recovery_offset >= sh->sector + STRIPE_SECTORS && | |
3598 | !is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
3599 | &first_bad, &bad_sectors)) | |
3600 | set_bit(R5_ReadRepl, &dev->flags); | |
3601 | else { | |
9a3e1101 N |
3602 | if (rdev) |
3603 | set_bit(R5_NeedReplace, &dev->flags); | |
14a75d3e N |
3604 | rdev = rcu_dereference(conf->disks[i].rdev); |
3605 | clear_bit(R5_ReadRepl, &dev->flags); | |
3606 | } | |
9283d8c5 N |
3607 | if (rdev && test_bit(Faulty, &rdev->flags)) |
3608 | rdev = NULL; | |
31c176ec N |
3609 | if (rdev) { |
3610 | is_bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
3611 | &first_bad, &bad_sectors); | |
3612 | if (s->blocked_rdev == NULL | |
3613 | && (test_bit(Blocked, &rdev->flags) | |
3614 | || is_bad < 0)) { | |
3615 | if (is_bad < 0) | |
3616 | set_bit(BlockedBadBlocks, | |
3617 | &rdev->flags); | |
3618 | s->blocked_rdev = rdev; | |
3619 | atomic_inc(&rdev->nr_pending); | |
3620 | } | |
6bfe0b49 | 3621 | } |
415e72d0 N |
3622 | clear_bit(R5_Insync, &dev->flags); |
3623 | if (!rdev) | |
3624 | /* Not in-sync */; | |
31c176ec N |
3625 | else if (is_bad) { |
3626 | /* also not in-sync */ | |
18b9837e N |
3627 | if (!test_bit(WriteErrorSeen, &rdev->flags) && |
3628 | test_bit(R5_UPTODATE, &dev->flags)) { | |
31c176ec N |
3629 | /* treat as in-sync, but with a read error |
3630 | * which we can now try to correct | |
3631 | */ | |
3632 | set_bit(R5_Insync, &dev->flags); | |
3633 | set_bit(R5_ReadError, &dev->flags); | |
3634 | } | |
3635 | } else if (test_bit(In_sync, &rdev->flags)) | |
415e72d0 | 3636 | set_bit(R5_Insync, &dev->flags); |
30d7a483 | 3637 | else if (sh->sector + STRIPE_SECTORS <= rdev->recovery_offset) |
415e72d0 | 3638 | /* in sync if before recovery_offset */ |
30d7a483 N |
3639 | set_bit(R5_Insync, &dev->flags); |
3640 | else if (test_bit(R5_UPTODATE, &dev->flags) && | |
3641 | test_bit(R5_Expanded, &dev->flags)) | |
3642 | /* If we've reshaped into here, we assume it is Insync. | |
3643 | * We will shortly update recovery_offset to make | |
3644 | * it official. | |
3645 | */ | |
3646 | set_bit(R5_Insync, &dev->flags); | |
3647 | ||
1cc03eb9 | 3648 | if (test_bit(R5_WriteError, &dev->flags)) { |
14a75d3e N |
3649 | /* This flag does not apply to '.replacement' |
3650 | * only to .rdev, so make sure to check that*/ | |
3651 | struct md_rdev *rdev2 = rcu_dereference( | |
3652 | conf->disks[i].rdev); | |
3653 | if (rdev2 == rdev) | |
3654 | clear_bit(R5_Insync, &dev->flags); | |
3655 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
bc2607f3 | 3656 | s->handle_bad_blocks = 1; |
14a75d3e | 3657 | atomic_inc(&rdev2->nr_pending); |
bc2607f3 N |
3658 | } else |
3659 | clear_bit(R5_WriteError, &dev->flags); | |
3660 | } | |
1cc03eb9 | 3661 | if (test_bit(R5_MadeGood, &dev->flags)) { |
14a75d3e N |
3662 | /* This flag does not apply to '.replacement' |
3663 | * only to .rdev, so make sure to check that*/ | |
3664 | struct md_rdev *rdev2 = rcu_dereference( | |
3665 | conf->disks[i].rdev); | |
3666 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
b84db560 | 3667 | s->handle_bad_blocks = 1; |
14a75d3e | 3668 | atomic_inc(&rdev2->nr_pending); |
b84db560 N |
3669 | } else |
3670 | clear_bit(R5_MadeGood, &dev->flags); | |
3671 | } | |
977df362 N |
3672 | if (test_bit(R5_MadeGoodRepl, &dev->flags)) { |
3673 | struct md_rdev *rdev2 = rcu_dereference( | |
3674 | conf->disks[i].replacement); | |
3675 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
3676 | s->handle_bad_blocks = 1; | |
3677 | atomic_inc(&rdev2->nr_pending); | |
3678 | } else | |
3679 | clear_bit(R5_MadeGoodRepl, &dev->flags); | |
3680 | } | |
415e72d0 | 3681 | if (!test_bit(R5_Insync, &dev->flags)) { |
16a53ecc N |
3682 | /* The ReadError flag will just be confusing now */ |
3683 | clear_bit(R5_ReadError, &dev->flags); | |
3684 | clear_bit(R5_ReWrite, &dev->flags); | |
1da177e4 | 3685 | } |
415e72d0 N |
3686 | if (test_bit(R5_ReadError, &dev->flags)) |
3687 | clear_bit(R5_Insync, &dev->flags); | |
3688 | if (!test_bit(R5_Insync, &dev->flags)) { | |
cc94015a N |
3689 | if (s->failed < 2) |
3690 | s->failed_num[s->failed] = i; | |
3691 | s->failed++; | |
9a3e1101 N |
3692 | if (rdev && !test_bit(Faulty, &rdev->flags)) |
3693 | do_recovery = 1; | |
415e72d0 | 3694 | } |
1da177e4 | 3695 | } |
9a3e1101 N |
3696 | if (test_bit(STRIPE_SYNCING, &sh->state)) { |
3697 | /* If there is a failed device being replaced, | |
3698 | * we must be recovering. | |
3699 | * else if we are after recovery_cp, we must be syncing | |
c6d2e084 | 3700 | * else if MD_RECOVERY_REQUESTED is set, we also are syncing. |
9a3e1101 N |
3701 | * else we can only be replacing |
3702 | * sync and recovery both need to read all devices, and so | |
3703 | * use the same flag. | |
3704 | */ | |
3705 | if (do_recovery || | |
c6d2e084 | 3706 | sh->sector >= conf->mddev->recovery_cp || |
3707 | test_bit(MD_RECOVERY_REQUESTED, &(conf->mddev->recovery))) | |
9a3e1101 N |
3708 | s->syncing = 1; |
3709 | else | |
3710 | s->replacing = 1; | |
3711 | } | |
1da177e4 | 3712 | rcu_read_unlock(); |
cc94015a N |
3713 | } |
3714 | ||
3715 | static void handle_stripe(struct stripe_head *sh) | |
3716 | { | |
3717 | struct stripe_head_state s; | |
d1688a6d | 3718 | struct r5conf *conf = sh->raid_conf; |
3687c061 | 3719 | int i; |
84789554 N |
3720 | int prexor; |
3721 | int disks = sh->disks; | |
474af965 | 3722 | struct r5dev *pdev, *qdev; |
cc94015a N |
3723 | |
3724 | clear_bit(STRIPE_HANDLE, &sh->state); | |
257a4b42 | 3725 | if (test_and_set_bit_lock(STRIPE_ACTIVE, &sh->state)) { |
cc94015a N |
3726 | /* already being handled, ensure it gets handled |
3727 | * again when current action finishes */ | |
3728 | set_bit(STRIPE_HANDLE, &sh->state); | |
3729 | return; | |
3730 | } | |
3731 | ||
f8dfcffd N |
3732 | if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state)) { |
3733 | spin_lock(&sh->stripe_lock); | |
3734 | /* Cannot process 'sync' concurrently with 'discard' */ | |
3735 | if (!test_bit(STRIPE_DISCARD, &sh->state) && | |
3736 | test_and_clear_bit(STRIPE_SYNC_REQUESTED, &sh->state)) { | |
3737 | set_bit(STRIPE_SYNCING, &sh->state); | |
3738 | clear_bit(STRIPE_INSYNC, &sh->state); | |
f94c0b66 | 3739 | clear_bit(STRIPE_REPLACED, &sh->state); |
f8dfcffd N |
3740 | } |
3741 | spin_unlock(&sh->stripe_lock); | |
cc94015a N |
3742 | } |
3743 | clear_bit(STRIPE_DELAYED, &sh->state); | |
3744 | ||
3745 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, " | |
3746 | "pd_idx=%d, qd_idx=%d\n, check:%d, reconstruct:%d\n", | |
3747 | (unsigned long long)sh->sector, sh->state, | |
3748 | atomic_read(&sh->count), sh->pd_idx, sh->qd_idx, | |
3749 | sh->check_state, sh->reconstruct_state); | |
3687c061 | 3750 | |
acfe726b | 3751 | analyse_stripe(sh, &s); |
c5a31000 | 3752 | |
bc2607f3 N |
3753 | if (s.handle_bad_blocks) { |
3754 | set_bit(STRIPE_HANDLE, &sh->state); | |
3755 | goto finish; | |
3756 | } | |
3757 | ||
474af965 N |
3758 | if (unlikely(s.blocked_rdev)) { |
3759 | if (s.syncing || s.expanding || s.expanded || | |
9a3e1101 | 3760 | s.replacing || s.to_write || s.written) { |
474af965 N |
3761 | set_bit(STRIPE_HANDLE, &sh->state); |
3762 | goto finish; | |
3763 | } | |
3764 | /* There is nothing for the blocked_rdev to block */ | |
3765 | rdev_dec_pending(s.blocked_rdev, conf->mddev); | |
3766 | s.blocked_rdev = NULL; | |
3767 | } | |
3768 | ||
3769 | if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) { | |
3770 | set_bit(STRIPE_OP_BIOFILL, &s.ops_request); | |
3771 | set_bit(STRIPE_BIOFILL_RUN, &sh->state); | |
3772 | } | |
3773 | ||
3774 | pr_debug("locked=%d uptodate=%d to_read=%d" | |
3775 | " to_write=%d failed=%d failed_num=%d,%d\n", | |
3776 | s.locked, s.uptodate, s.to_read, s.to_write, s.failed, | |
3777 | s.failed_num[0], s.failed_num[1]); | |
3778 | /* check if the array has lost more than max_degraded devices and, | |
3779 | * if so, some requests might need to be failed. | |
3780 | */ | |
9a3f530f N |
3781 | if (s.failed > conf->max_degraded) { |
3782 | sh->check_state = 0; | |
3783 | sh->reconstruct_state = 0; | |
3784 | if (s.to_read+s.to_write+s.written) | |
3785 | handle_failed_stripe(conf, sh, &s, disks, &s.return_bi); | |
9a3e1101 | 3786 | if (s.syncing + s.replacing) |
9a3f530f N |
3787 | handle_failed_sync(conf, sh, &s); |
3788 | } | |
474af965 | 3789 | |
84789554 N |
3790 | /* Now we check to see if any write operations have recently |
3791 | * completed | |
3792 | */ | |
3793 | prexor = 0; | |
3794 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_result) | |
3795 | prexor = 1; | |
3796 | if (sh->reconstruct_state == reconstruct_state_drain_result || | |
3797 | sh->reconstruct_state == reconstruct_state_prexor_drain_result) { | |
3798 | sh->reconstruct_state = reconstruct_state_idle; | |
3799 | ||
3800 | /* All the 'written' buffers and the parity block are ready to | |
3801 | * be written back to disk | |
3802 | */ | |
9e444768 SL |
3803 | BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags) && |
3804 | !test_bit(R5_Discard, &sh->dev[sh->pd_idx].flags)); | |
84789554 | 3805 | BUG_ON(sh->qd_idx >= 0 && |
9e444768 SL |
3806 | !test_bit(R5_UPTODATE, &sh->dev[sh->qd_idx].flags) && |
3807 | !test_bit(R5_Discard, &sh->dev[sh->qd_idx].flags)); | |
84789554 N |
3808 | for (i = disks; i--; ) { |
3809 | struct r5dev *dev = &sh->dev[i]; | |
3810 | if (test_bit(R5_LOCKED, &dev->flags) && | |
3811 | (i == sh->pd_idx || i == sh->qd_idx || | |
3812 | dev->written)) { | |
3813 | pr_debug("Writing block %d\n", i); | |
3814 | set_bit(R5_Wantwrite, &dev->flags); | |
3815 | if (prexor) | |
3816 | continue; | |
9c4bdf69 N |
3817 | if (s.failed > 1) |
3818 | continue; | |
84789554 N |
3819 | if (!test_bit(R5_Insync, &dev->flags) || |
3820 | ((i == sh->pd_idx || i == sh->qd_idx) && | |
3821 | s.failed == 0)) | |
3822 | set_bit(STRIPE_INSYNC, &sh->state); | |
3823 | } | |
3824 | } | |
3825 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
3826 | s.dec_preread_active = 1; | |
3827 | } | |
3828 | ||
ef5b7c69 N |
3829 | /* |
3830 | * might be able to return some write requests if the parity blocks | |
3831 | * are safe, or on a failed drive | |
3832 | */ | |
3833 | pdev = &sh->dev[sh->pd_idx]; | |
3834 | s.p_failed = (s.failed >= 1 && s.failed_num[0] == sh->pd_idx) | |
3835 | || (s.failed >= 2 && s.failed_num[1] == sh->pd_idx); | |
3836 | qdev = &sh->dev[sh->qd_idx]; | |
3837 | s.q_failed = (s.failed >= 1 && s.failed_num[0] == sh->qd_idx) | |
3838 | || (s.failed >= 2 && s.failed_num[1] == sh->qd_idx) | |
3839 | || conf->level < 6; | |
3840 | ||
3841 | if (s.written && | |
3842 | (s.p_failed || ((test_bit(R5_Insync, &pdev->flags) | |
3843 | && !test_bit(R5_LOCKED, &pdev->flags) | |
3844 | && (test_bit(R5_UPTODATE, &pdev->flags) || | |
3845 | test_bit(R5_Discard, &pdev->flags))))) && | |
3846 | (s.q_failed || ((test_bit(R5_Insync, &qdev->flags) | |
3847 | && !test_bit(R5_LOCKED, &qdev->flags) | |
3848 | && (test_bit(R5_UPTODATE, &qdev->flags) || | |
3849 | test_bit(R5_Discard, &qdev->flags)))))) | |
3850 | handle_stripe_clean_event(conf, sh, disks, &s.return_bi); | |
3851 | ||
3852 | /* Now we might consider reading some blocks, either to check/generate | |
3853 | * parity, or to satisfy requests | |
3854 | * or to load a block that is being partially written. | |
3855 | */ | |
3856 | if (s.to_read || s.non_overwrite | |
3857 | || (conf->level == 6 && s.to_write && s.failed) | |
3858 | || (s.syncing && (s.uptodate + s.compute < disks)) | |
3859 | || s.replacing | |
3860 | || s.expanding) | |
3861 | handle_stripe_fill(sh, &s, disks); | |
3862 | ||
84789554 N |
3863 | /* Now to consider new write requests and what else, if anything |
3864 | * should be read. We do not handle new writes when: | |
3865 | * 1/ A 'write' operation (copy+xor) is already in flight. | |
3866 | * 2/ A 'check' operation is in flight, as it may clobber the parity | |
3867 | * block. | |
3868 | */ | |
3869 | if (s.to_write && !sh->reconstruct_state && !sh->check_state) | |
3870 | handle_stripe_dirtying(conf, sh, &s, disks); | |
3871 | ||
3872 | /* maybe we need to check and possibly fix the parity for this stripe | |
3873 | * Any reads will already have been scheduled, so we just see if enough | |
3874 | * data is available. The parity check is held off while parity | |
3875 | * dependent operations are in flight. | |
3876 | */ | |
3877 | if (sh->check_state || | |
3878 | (s.syncing && s.locked == 0 && | |
3879 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && | |
3880 | !test_bit(STRIPE_INSYNC, &sh->state))) { | |
3881 | if (conf->level == 6) | |
3882 | handle_parity_checks6(conf, sh, &s, disks); | |
3883 | else | |
3884 | handle_parity_checks5(conf, sh, &s, disks); | |
3885 | } | |
c5a31000 | 3886 | |
f94c0b66 N |
3887 | if ((s.replacing || s.syncing) && s.locked == 0 |
3888 | && !test_bit(STRIPE_COMPUTE_RUN, &sh->state) | |
3889 | && !test_bit(STRIPE_REPLACED, &sh->state)) { | |
9a3e1101 N |
3890 | /* Write out to replacement devices where possible */ |
3891 | for (i = 0; i < conf->raid_disks; i++) | |
f94c0b66 N |
3892 | if (test_bit(R5_NeedReplace, &sh->dev[i].flags)) { |
3893 | WARN_ON(!test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
9a3e1101 N |
3894 | set_bit(R5_WantReplace, &sh->dev[i].flags); |
3895 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
3896 | s.locked++; | |
3897 | } | |
f94c0b66 N |
3898 | if (s.replacing) |
3899 | set_bit(STRIPE_INSYNC, &sh->state); | |
3900 | set_bit(STRIPE_REPLACED, &sh->state); | |
9a3e1101 N |
3901 | } |
3902 | if ((s.syncing || s.replacing) && s.locked == 0 && | |
f94c0b66 | 3903 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && |
9a3e1101 | 3904 | test_bit(STRIPE_INSYNC, &sh->state)) { |
c5a31000 N |
3905 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); |
3906 | clear_bit(STRIPE_SYNCING, &sh->state); | |
f8dfcffd N |
3907 | if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags)) |
3908 | wake_up(&conf->wait_for_overlap); | |
c5a31000 N |
3909 | } |
3910 | ||
3911 | /* If the failed drives are just a ReadError, then we might need | |
3912 | * to progress the repair/check process | |
3913 | */ | |
3914 | if (s.failed <= conf->max_degraded && !conf->mddev->ro) | |
3915 | for (i = 0; i < s.failed; i++) { | |
3916 | struct r5dev *dev = &sh->dev[s.failed_num[i]]; | |
3917 | if (test_bit(R5_ReadError, &dev->flags) | |
3918 | && !test_bit(R5_LOCKED, &dev->flags) | |
3919 | && test_bit(R5_UPTODATE, &dev->flags) | |
3920 | ) { | |
3921 | if (!test_bit(R5_ReWrite, &dev->flags)) { | |
3922 | set_bit(R5_Wantwrite, &dev->flags); | |
3923 | set_bit(R5_ReWrite, &dev->flags); | |
3924 | set_bit(R5_LOCKED, &dev->flags); | |
3925 | s.locked++; | |
3926 | } else { | |
3927 | /* let's read it back */ | |
3928 | set_bit(R5_Wantread, &dev->flags); | |
3929 | set_bit(R5_LOCKED, &dev->flags); | |
3930 | s.locked++; | |
3931 | } | |
3932 | } | |
3933 | } | |
3934 | ||
3687c061 N |
3935 | /* Finish reconstruct operations initiated by the expansion process */ |
3936 | if (sh->reconstruct_state == reconstruct_state_result) { | |
3937 | struct stripe_head *sh_src | |
3938 | = get_active_stripe(conf, sh->sector, 1, 1, 1); | |
3939 | if (sh_src && test_bit(STRIPE_EXPAND_SOURCE, &sh_src->state)) { | |
3940 | /* sh cannot be written until sh_src has been read. | |
3941 | * so arrange for sh to be delayed a little | |
3942 | */ | |
3943 | set_bit(STRIPE_DELAYED, &sh->state); | |
3944 | set_bit(STRIPE_HANDLE, &sh->state); | |
3945 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, | |
3946 | &sh_src->state)) | |
3947 | atomic_inc(&conf->preread_active_stripes); | |
3948 | release_stripe(sh_src); | |
3949 | goto finish; | |
3950 | } | |
3951 | if (sh_src) | |
3952 | release_stripe(sh_src); | |
3953 | ||
3954 | sh->reconstruct_state = reconstruct_state_idle; | |
3955 | clear_bit(STRIPE_EXPANDING, &sh->state); | |
3956 | for (i = conf->raid_disks; i--; ) { | |
3957 | set_bit(R5_Wantwrite, &sh->dev[i].flags); | |
3958 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
3959 | s.locked++; | |
3960 | } | |
3961 | } | |
f416885e | 3962 | |
3687c061 N |
3963 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) && |
3964 | !sh->reconstruct_state) { | |
3965 | /* Need to write out all blocks after computing parity */ | |
3966 | sh->disks = conf->raid_disks; | |
3967 | stripe_set_idx(sh->sector, conf, 0, sh); | |
3968 | schedule_reconstruction(sh, &s, 1, 1); | |
3969 | } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) { | |
3970 | clear_bit(STRIPE_EXPAND_READY, &sh->state); | |
3971 | atomic_dec(&conf->reshape_stripes); | |
3972 | wake_up(&conf->wait_for_overlap); | |
3973 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
3974 | } | |
3975 | ||
3976 | if (s.expanding && s.locked == 0 && | |
3977 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) | |
3978 | handle_stripe_expansion(conf, sh); | |
16a53ecc | 3979 | |
3687c061 | 3980 | finish: |
6bfe0b49 | 3981 | /* wait for this device to become unblocked */ |
5f066c63 N |
3982 | if (unlikely(s.blocked_rdev)) { |
3983 | if (conf->mddev->external) | |
3984 | md_wait_for_blocked_rdev(s.blocked_rdev, | |
3985 | conf->mddev); | |
3986 | else | |
3987 | /* Internal metadata will immediately | |
3988 | * be written by raid5d, so we don't | |
3989 | * need to wait here. | |
3990 | */ | |
3991 | rdev_dec_pending(s.blocked_rdev, | |
3992 | conf->mddev); | |
3993 | } | |
6bfe0b49 | 3994 | |
bc2607f3 N |
3995 | if (s.handle_bad_blocks) |
3996 | for (i = disks; i--; ) { | |
3cb03002 | 3997 | struct md_rdev *rdev; |
bc2607f3 N |
3998 | struct r5dev *dev = &sh->dev[i]; |
3999 | if (test_and_clear_bit(R5_WriteError, &dev->flags)) { | |
4000 | /* We own a safe reference to the rdev */ | |
4001 | rdev = conf->disks[i].rdev; | |
4002 | if (!rdev_set_badblocks(rdev, sh->sector, | |
4003 | STRIPE_SECTORS, 0)) | |
4004 | md_error(conf->mddev, rdev); | |
4005 | rdev_dec_pending(rdev, conf->mddev); | |
4006 | } | |
b84db560 N |
4007 | if (test_and_clear_bit(R5_MadeGood, &dev->flags)) { |
4008 | rdev = conf->disks[i].rdev; | |
4009 | rdev_clear_badblocks(rdev, sh->sector, | |
c6563a8c | 4010 | STRIPE_SECTORS, 0); |
b84db560 N |
4011 | rdev_dec_pending(rdev, conf->mddev); |
4012 | } | |
977df362 N |
4013 | if (test_and_clear_bit(R5_MadeGoodRepl, &dev->flags)) { |
4014 | rdev = conf->disks[i].replacement; | |
dd054fce N |
4015 | if (!rdev) |
4016 | /* rdev have been moved down */ | |
4017 | rdev = conf->disks[i].rdev; | |
977df362 | 4018 | rdev_clear_badblocks(rdev, sh->sector, |
c6563a8c | 4019 | STRIPE_SECTORS, 0); |
977df362 N |
4020 | rdev_dec_pending(rdev, conf->mddev); |
4021 | } | |
bc2607f3 N |
4022 | } |
4023 | ||
6c0069c0 YT |
4024 | if (s.ops_request) |
4025 | raid_run_ops(sh, s.ops_request); | |
4026 | ||
f0e43bcd | 4027 | ops_run_io(sh, &s); |
16a53ecc | 4028 | |
c5709ef6 | 4029 | if (s.dec_preread_active) { |
729a1866 | 4030 | /* We delay this until after ops_run_io so that if make_request |
e9c7469b | 4031 | * is waiting on a flush, it won't continue until the writes |
729a1866 N |
4032 | * have actually been submitted. |
4033 | */ | |
4034 | atomic_dec(&conf->preread_active_stripes); | |
4035 | if (atomic_read(&conf->preread_active_stripes) < | |
4036 | IO_THRESHOLD) | |
4037 | md_wakeup_thread(conf->mddev->thread); | |
4038 | } | |
4039 | ||
c5709ef6 | 4040 | return_io(s.return_bi); |
16a53ecc | 4041 | |
257a4b42 | 4042 | clear_bit_unlock(STRIPE_ACTIVE, &sh->state); |
16a53ecc N |
4043 | } |
4044 | ||
d1688a6d | 4045 | static void raid5_activate_delayed(struct r5conf *conf) |
16a53ecc N |
4046 | { |
4047 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) { | |
4048 | while (!list_empty(&conf->delayed_list)) { | |
4049 | struct list_head *l = conf->delayed_list.next; | |
4050 | struct stripe_head *sh; | |
4051 | sh = list_entry(l, struct stripe_head, lru); | |
4052 | list_del_init(l); | |
4053 | clear_bit(STRIPE_DELAYED, &sh->state); | |
4054 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
4055 | atomic_inc(&conf->preread_active_stripes); | |
8b3e6cdc | 4056 | list_add_tail(&sh->lru, &conf->hold_list); |
851c30c9 | 4057 | raid5_wakeup_stripe_thread(sh); |
16a53ecc | 4058 | } |
482c0834 | 4059 | } |
16a53ecc N |
4060 | } |
4061 | ||
566c09c5 SL |
4062 | static void activate_bit_delay(struct r5conf *conf, |
4063 | struct list_head *temp_inactive_list) | |
16a53ecc N |
4064 | { |
4065 | /* device_lock is held */ | |
4066 | struct list_head head; | |
4067 | list_add(&head, &conf->bitmap_list); | |
4068 | list_del_init(&conf->bitmap_list); | |
4069 | while (!list_empty(&head)) { | |
4070 | struct stripe_head *sh = list_entry(head.next, struct stripe_head, lru); | |
566c09c5 | 4071 | int hash; |
16a53ecc N |
4072 | list_del_init(&sh->lru); |
4073 | atomic_inc(&sh->count); | |
566c09c5 SL |
4074 | hash = sh->hash_lock_index; |
4075 | __release_stripe(conf, sh, &temp_inactive_list[hash]); | |
16a53ecc N |
4076 | } |
4077 | } | |
4078 | ||
fd01b88c | 4079 | int md_raid5_congested(struct mddev *mddev, int bits) |
f022b2fd | 4080 | { |
d1688a6d | 4081 | struct r5conf *conf = mddev->private; |
f022b2fd N |
4082 | |
4083 | /* No difference between reads and writes. Just check | |
4084 | * how busy the stripe_cache is | |
4085 | */ | |
3fa841d7 | 4086 | |
f022b2fd N |
4087 | if (conf->inactive_blocked) |
4088 | return 1; | |
4089 | if (conf->quiesce) | |
4090 | return 1; | |
4bda556a | 4091 | if (atomic_read(&conf->empty_inactive_list_nr)) |
f022b2fd N |
4092 | return 1; |
4093 | ||
4094 | return 0; | |
4095 | } | |
11d8a6e3 N |
4096 | EXPORT_SYMBOL_GPL(md_raid5_congested); |
4097 | ||
4098 | static int raid5_congested(void *data, int bits) | |
4099 | { | |
fd01b88c | 4100 | struct mddev *mddev = data; |
11d8a6e3 N |
4101 | |
4102 | return mddev_congested(mddev, bits) || | |
4103 | md_raid5_congested(mddev, bits); | |
4104 | } | |
f022b2fd | 4105 | |
23032a0e RBJ |
4106 | /* We want read requests to align with chunks where possible, |
4107 | * but write requests don't need to. | |
4108 | */ | |
cc371e66 AK |
4109 | static int raid5_mergeable_bvec(struct request_queue *q, |
4110 | struct bvec_merge_data *bvm, | |
4111 | struct bio_vec *biovec) | |
23032a0e | 4112 | { |
fd01b88c | 4113 | struct mddev *mddev = q->queuedata; |
cc371e66 | 4114 | sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); |
23032a0e | 4115 | int max; |
9d8f0363 | 4116 | unsigned int chunk_sectors = mddev->chunk_sectors; |
cc371e66 | 4117 | unsigned int bio_sectors = bvm->bi_size >> 9; |
23032a0e | 4118 | |
cc371e66 | 4119 | if ((bvm->bi_rw & 1) == WRITE) |
23032a0e RBJ |
4120 | return biovec->bv_len; /* always allow writes to be mergeable */ |
4121 | ||
664e7c41 AN |
4122 | if (mddev->new_chunk_sectors < mddev->chunk_sectors) |
4123 | chunk_sectors = mddev->new_chunk_sectors; | |
23032a0e RBJ |
4124 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9; |
4125 | if (max < 0) max = 0; | |
4126 | if (max <= biovec->bv_len && bio_sectors == 0) | |
4127 | return biovec->bv_len; | |
4128 | else | |
4129 | return max; | |
4130 | } | |
4131 | ||
fd01b88c | 4132 | static int in_chunk_boundary(struct mddev *mddev, struct bio *bio) |
f679623f | 4133 | { |
4f024f37 | 4134 | sector_t sector = bio->bi_iter.bi_sector + get_start_sect(bio->bi_bdev); |
9d8f0363 | 4135 | unsigned int chunk_sectors = mddev->chunk_sectors; |
aa8b57aa | 4136 | unsigned int bio_sectors = bio_sectors(bio); |
f679623f | 4137 | |
664e7c41 AN |
4138 | if (mddev->new_chunk_sectors < mddev->chunk_sectors) |
4139 | chunk_sectors = mddev->new_chunk_sectors; | |
f679623f RBJ |
4140 | return chunk_sectors >= |
4141 | ((sector & (chunk_sectors - 1)) + bio_sectors); | |
4142 | } | |
4143 | ||
46031f9a RBJ |
4144 | /* |
4145 | * add bio to the retry LIFO ( in O(1) ... we are in interrupt ) | |
4146 | * later sampled by raid5d. | |
4147 | */ | |
d1688a6d | 4148 | static void add_bio_to_retry(struct bio *bi,struct r5conf *conf) |
46031f9a RBJ |
4149 | { |
4150 | unsigned long flags; | |
4151 | ||
4152 | spin_lock_irqsave(&conf->device_lock, flags); | |
4153 | ||
4154 | bi->bi_next = conf->retry_read_aligned_list; | |
4155 | conf->retry_read_aligned_list = bi; | |
4156 | ||
4157 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
4158 | md_wakeup_thread(conf->mddev->thread); | |
4159 | } | |
4160 | ||
d1688a6d | 4161 | static struct bio *remove_bio_from_retry(struct r5conf *conf) |
46031f9a RBJ |
4162 | { |
4163 | struct bio *bi; | |
4164 | ||
4165 | bi = conf->retry_read_aligned; | |
4166 | if (bi) { | |
4167 | conf->retry_read_aligned = NULL; | |
4168 | return bi; | |
4169 | } | |
4170 | bi = conf->retry_read_aligned_list; | |
4171 | if(bi) { | |
387bb173 | 4172 | conf->retry_read_aligned_list = bi->bi_next; |
46031f9a | 4173 | bi->bi_next = NULL; |
960e739d JA |
4174 | /* |
4175 | * this sets the active strip count to 1 and the processed | |
4176 | * strip count to zero (upper 8 bits) | |
4177 | */ | |
e7836bd6 | 4178 | raid5_set_bi_stripes(bi, 1); /* biased count of active stripes */ |
46031f9a RBJ |
4179 | } |
4180 | ||
4181 | return bi; | |
4182 | } | |
4183 | ||
f679623f RBJ |
4184 | /* |
4185 | * The "raid5_align_endio" should check if the read succeeded and if it | |
4186 | * did, call bio_endio on the original bio (having bio_put the new bio | |
4187 | * first). | |
4188 | * If the read failed.. | |
4189 | */ | |
6712ecf8 | 4190 | static void raid5_align_endio(struct bio *bi, int error) |
f679623f RBJ |
4191 | { |
4192 | struct bio* raid_bi = bi->bi_private; | |
fd01b88c | 4193 | struct mddev *mddev; |
d1688a6d | 4194 | struct r5conf *conf; |
46031f9a | 4195 | int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); |
3cb03002 | 4196 | struct md_rdev *rdev; |
46031f9a | 4197 | |
f679623f | 4198 | bio_put(bi); |
46031f9a | 4199 | |
46031f9a RBJ |
4200 | rdev = (void*)raid_bi->bi_next; |
4201 | raid_bi->bi_next = NULL; | |
2b7f2228 N |
4202 | mddev = rdev->mddev; |
4203 | conf = mddev->private; | |
46031f9a RBJ |
4204 | |
4205 | rdev_dec_pending(rdev, conf->mddev); | |
4206 | ||
4207 | if (!error && uptodate) { | |
0a82a8d1 LT |
4208 | trace_block_bio_complete(bdev_get_queue(raid_bi->bi_bdev), |
4209 | raid_bi, 0); | |
6712ecf8 | 4210 | bio_endio(raid_bi, 0); |
46031f9a RBJ |
4211 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
4212 | wake_up(&conf->wait_for_stripe); | |
6712ecf8 | 4213 | return; |
46031f9a RBJ |
4214 | } |
4215 | ||
45b4233c | 4216 | pr_debug("raid5_align_endio : io error...handing IO for a retry\n"); |
46031f9a RBJ |
4217 | |
4218 | add_bio_to_retry(raid_bi, conf); | |
f679623f RBJ |
4219 | } |
4220 | ||
387bb173 NB |
4221 | static int bio_fits_rdev(struct bio *bi) |
4222 | { | |
165125e1 | 4223 | struct request_queue *q = bdev_get_queue(bi->bi_bdev); |
387bb173 | 4224 | |
aa8b57aa | 4225 | if (bio_sectors(bi) > queue_max_sectors(q)) |
387bb173 NB |
4226 | return 0; |
4227 | blk_recount_segments(q, bi); | |
8a78362c | 4228 | if (bi->bi_phys_segments > queue_max_segments(q)) |
387bb173 NB |
4229 | return 0; |
4230 | ||
4231 | if (q->merge_bvec_fn) | |
4232 | /* it's too hard to apply the merge_bvec_fn at this stage, | |
4233 | * just just give up | |
4234 | */ | |
4235 | return 0; | |
4236 | ||
4237 | return 1; | |
4238 | } | |
4239 | ||
fd01b88c | 4240 | static int chunk_aligned_read(struct mddev *mddev, struct bio * raid_bio) |
f679623f | 4241 | { |
d1688a6d | 4242 | struct r5conf *conf = mddev->private; |
8553fe7e | 4243 | int dd_idx; |
f679623f | 4244 | struct bio* align_bi; |
3cb03002 | 4245 | struct md_rdev *rdev; |
671488cc | 4246 | sector_t end_sector; |
f679623f RBJ |
4247 | |
4248 | if (!in_chunk_boundary(mddev, raid_bio)) { | |
45b4233c | 4249 | pr_debug("chunk_aligned_read : non aligned\n"); |
f679623f RBJ |
4250 | return 0; |
4251 | } | |
4252 | /* | |
a167f663 | 4253 | * use bio_clone_mddev to make a copy of the bio |
f679623f | 4254 | */ |
a167f663 | 4255 | align_bi = bio_clone_mddev(raid_bio, GFP_NOIO, mddev); |
f679623f RBJ |
4256 | if (!align_bi) |
4257 | return 0; | |
4258 | /* | |
4259 | * set bi_end_io to a new function, and set bi_private to the | |
4260 | * original bio. | |
4261 | */ | |
4262 | align_bi->bi_end_io = raid5_align_endio; | |
4263 | align_bi->bi_private = raid_bio; | |
4264 | /* | |
4265 | * compute position | |
4266 | */ | |
4f024f37 KO |
4267 | align_bi->bi_iter.bi_sector = |
4268 | raid5_compute_sector(conf, raid_bio->bi_iter.bi_sector, | |
4269 | 0, &dd_idx, NULL); | |
f679623f | 4270 | |
f73a1c7d | 4271 | end_sector = bio_end_sector(align_bi); |
f679623f | 4272 | rcu_read_lock(); |
671488cc N |
4273 | rdev = rcu_dereference(conf->disks[dd_idx].replacement); |
4274 | if (!rdev || test_bit(Faulty, &rdev->flags) || | |
4275 | rdev->recovery_offset < end_sector) { | |
4276 | rdev = rcu_dereference(conf->disks[dd_idx].rdev); | |
4277 | if (rdev && | |
4278 | (test_bit(Faulty, &rdev->flags) || | |
4279 | !(test_bit(In_sync, &rdev->flags) || | |
4280 | rdev->recovery_offset >= end_sector))) | |
4281 | rdev = NULL; | |
4282 | } | |
4283 | if (rdev) { | |
31c176ec N |
4284 | sector_t first_bad; |
4285 | int bad_sectors; | |
4286 | ||
f679623f RBJ |
4287 | atomic_inc(&rdev->nr_pending); |
4288 | rcu_read_unlock(); | |
46031f9a RBJ |
4289 | raid_bio->bi_next = (void*)rdev; |
4290 | align_bi->bi_bdev = rdev->bdev; | |
3fd83717 | 4291 | __clear_bit(BIO_SEG_VALID, &align_bi->bi_flags); |
46031f9a | 4292 | |
31c176ec | 4293 | if (!bio_fits_rdev(align_bi) || |
4f024f37 KO |
4294 | is_badblock(rdev, align_bi->bi_iter.bi_sector, |
4295 | bio_sectors(align_bi), | |
31c176ec N |
4296 | &first_bad, &bad_sectors)) { |
4297 | /* too big in some way, or has a known bad block */ | |
387bb173 NB |
4298 | bio_put(align_bi); |
4299 | rdev_dec_pending(rdev, mddev); | |
4300 | return 0; | |
4301 | } | |
4302 | ||
6c0544e2 | 4303 | /* No reshape active, so we can trust rdev->data_offset */ |
4f024f37 | 4304 | align_bi->bi_iter.bi_sector += rdev->data_offset; |
6c0544e2 | 4305 | |
46031f9a RBJ |
4306 | spin_lock_irq(&conf->device_lock); |
4307 | wait_event_lock_irq(conf->wait_for_stripe, | |
4308 | conf->quiesce == 0, | |
eed8c02e | 4309 | conf->device_lock); |
46031f9a RBJ |
4310 | atomic_inc(&conf->active_aligned_reads); |
4311 | spin_unlock_irq(&conf->device_lock); | |
4312 | ||
e3620a3a JB |
4313 | if (mddev->gendisk) |
4314 | trace_block_bio_remap(bdev_get_queue(align_bi->bi_bdev), | |
4315 | align_bi, disk_devt(mddev->gendisk), | |
4f024f37 | 4316 | raid_bio->bi_iter.bi_sector); |
f679623f RBJ |
4317 | generic_make_request(align_bi); |
4318 | return 1; | |
4319 | } else { | |
4320 | rcu_read_unlock(); | |
46031f9a | 4321 | bio_put(align_bi); |
f679623f RBJ |
4322 | return 0; |
4323 | } | |
4324 | } | |
4325 | ||
8b3e6cdc DW |
4326 | /* __get_priority_stripe - get the next stripe to process |
4327 | * | |
4328 | * Full stripe writes are allowed to pass preread active stripes up until | |
4329 | * the bypass_threshold is exceeded. In general the bypass_count | |
4330 | * increments when the handle_list is handled before the hold_list; however, it | |
4331 | * will not be incremented when STRIPE_IO_STARTED is sampled set signifying a | |
4332 | * stripe with in flight i/o. The bypass_count will be reset when the | |
4333 | * head of the hold_list has changed, i.e. the head was promoted to the | |
4334 | * handle_list. | |
4335 | */ | |
851c30c9 | 4336 | static struct stripe_head *__get_priority_stripe(struct r5conf *conf, int group) |
8b3e6cdc | 4337 | { |
851c30c9 SL |
4338 | struct stripe_head *sh = NULL, *tmp; |
4339 | struct list_head *handle_list = NULL; | |
bfc90cb0 | 4340 | struct r5worker_group *wg = NULL; |
851c30c9 SL |
4341 | |
4342 | if (conf->worker_cnt_per_group == 0) { | |
4343 | handle_list = &conf->handle_list; | |
4344 | } else if (group != ANY_GROUP) { | |
4345 | handle_list = &conf->worker_groups[group].handle_list; | |
bfc90cb0 | 4346 | wg = &conf->worker_groups[group]; |
851c30c9 SL |
4347 | } else { |
4348 | int i; | |
4349 | for (i = 0; i < conf->group_cnt; i++) { | |
4350 | handle_list = &conf->worker_groups[i].handle_list; | |
bfc90cb0 | 4351 | wg = &conf->worker_groups[i]; |
851c30c9 SL |
4352 | if (!list_empty(handle_list)) |
4353 | break; | |
4354 | } | |
4355 | } | |
8b3e6cdc DW |
4356 | |
4357 | pr_debug("%s: handle: %s hold: %s full_writes: %d bypass_count: %d\n", | |
4358 | __func__, | |
851c30c9 | 4359 | list_empty(handle_list) ? "empty" : "busy", |
8b3e6cdc DW |
4360 | list_empty(&conf->hold_list) ? "empty" : "busy", |
4361 | atomic_read(&conf->pending_full_writes), conf->bypass_count); | |
4362 | ||
851c30c9 SL |
4363 | if (!list_empty(handle_list)) { |
4364 | sh = list_entry(handle_list->next, typeof(*sh), lru); | |
8b3e6cdc DW |
4365 | |
4366 | if (list_empty(&conf->hold_list)) | |
4367 | conf->bypass_count = 0; | |
4368 | else if (!test_bit(STRIPE_IO_STARTED, &sh->state)) { | |
4369 | if (conf->hold_list.next == conf->last_hold) | |
4370 | conf->bypass_count++; | |
4371 | else { | |
4372 | conf->last_hold = conf->hold_list.next; | |
4373 | conf->bypass_count -= conf->bypass_threshold; | |
4374 | if (conf->bypass_count < 0) | |
4375 | conf->bypass_count = 0; | |
4376 | } | |
4377 | } | |
4378 | } else if (!list_empty(&conf->hold_list) && | |
4379 | ((conf->bypass_threshold && | |
4380 | conf->bypass_count > conf->bypass_threshold) || | |
4381 | atomic_read(&conf->pending_full_writes) == 0)) { | |
851c30c9 SL |
4382 | |
4383 | list_for_each_entry(tmp, &conf->hold_list, lru) { | |
4384 | if (conf->worker_cnt_per_group == 0 || | |
4385 | group == ANY_GROUP || | |
4386 | !cpu_online(tmp->cpu) || | |
4387 | cpu_to_group(tmp->cpu) == group) { | |
4388 | sh = tmp; | |
4389 | break; | |
4390 | } | |
4391 | } | |
4392 | ||
4393 | if (sh) { | |
4394 | conf->bypass_count -= conf->bypass_threshold; | |
4395 | if (conf->bypass_count < 0) | |
4396 | conf->bypass_count = 0; | |
4397 | } | |
bfc90cb0 | 4398 | wg = NULL; |
851c30c9 SL |
4399 | } |
4400 | ||
4401 | if (!sh) | |
8b3e6cdc DW |
4402 | return NULL; |
4403 | ||
bfc90cb0 SL |
4404 | if (wg) { |
4405 | wg->stripes_cnt--; | |
4406 | sh->group = NULL; | |
4407 | } | |
8b3e6cdc | 4408 | list_del_init(&sh->lru); |
c7a6d35e | 4409 | BUG_ON(atomic_inc_return(&sh->count) != 1); |
8b3e6cdc DW |
4410 | return sh; |
4411 | } | |
f679623f | 4412 | |
8811b596 SL |
4413 | struct raid5_plug_cb { |
4414 | struct blk_plug_cb cb; | |
4415 | struct list_head list; | |
566c09c5 | 4416 | struct list_head temp_inactive_list[NR_STRIPE_HASH_LOCKS]; |
8811b596 SL |
4417 | }; |
4418 | ||
4419 | static void raid5_unplug(struct blk_plug_cb *blk_cb, bool from_schedule) | |
4420 | { | |
4421 | struct raid5_plug_cb *cb = container_of( | |
4422 | blk_cb, struct raid5_plug_cb, cb); | |
4423 | struct stripe_head *sh; | |
4424 | struct mddev *mddev = cb->cb.data; | |
4425 | struct r5conf *conf = mddev->private; | |
a9add5d9 | 4426 | int cnt = 0; |
566c09c5 | 4427 | int hash; |
8811b596 SL |
4428 | |
4429 | if (cb->list.next && !list_empty(&cb->list)) { | |
4430 | spin_lock_irq(&conf->device_lock); | |
4431 | while (!list_empty(&cb->list)) { | |
4432 | sh = list_first_entry(&cb->list, struct stripe_head, lru); | |
4433 | list_del_init(&sh->lru); | |
4434 | /* | |
4435 | * avoid race release_stripe_plug() sees | |
4436 | * STRIPE_ON_UNPLUG_LIST clear but the stripe | |
4437 | * is still in our list | |
4438 | */ | |
4e857c58 | 4439 | smp_mb__before_atomic(); |
8811b596 | 4440 | clear_bit(STRIPE_ON_UNPLUG_LIST, &sh->state); |
773ca82f SL |
4441 | /* |
4442 | * STRIPE_ON_RELEASE_LIST could be set here. In that | |
4443 | * case, the count is always > 1 here | |
4444 | */ | |
566c09c5 SL |
4445 | hash = sh->hash_lock_index; |
4446 | __release_stripe(conf, sh, &cb->temp_inactive_list[hash]); | |
a9add5d9 | 4447 | cnt++; |
8811b596 SL |
4448 | } |
4449 | spin_unlock_irq(&conf->device_lock); | |
4450 | } | |
566c09c5 SL |
4451 | release_inactive_stripe_list(conf, cb->temp_inactive_list, |
4452 | NR_STRIPE_HASH_LOCKS); | |
e3620a3a JB |
4453 | if (mddev->queue) |
4454 | trace_block_unplug(mddev->queue, cnt, !from_schedule); | |
8811b596 SL |
4455 | kfree(cb); |
4456 | } | |
4457 | ||
4458 | static void release_stripe_plug(struct mddev *mddev, | |
4459 | struct stripe_head *sh) | |
4460 | { | |
4461 | struct blk_plug_cb *blk_cb = blk_check_plugged( | |
4462 | raid5_unplug, mddev, | |
4463 | sizeof(struct raid5_plug_cb)); | |
4464 | struct raid5_plug_cb *cb; | |
4465 | ||
4466 | if (!blk_cb) { | |
4467 | release_stripe(sh); | |
4468 | return; | |
4469 | } | |
4470 | ||
4471 | cb = container_of(blk_cb, struct raid5_plug_cb, cb); | |
4472 | ||
566c09c5 SL |
4473 | if (cb->list.next == NULL) { |
4474 | int i; | |
8811b596 | 4475 | INIT_LIST_HEAD(&cb->list); |
566c09c5 SL |
4476 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) |
4477 | INIT_LIST_HEAD(cb->temp_inactive_list + i); | |
4478 | } | |
8811b596 SL |
4479 | |
4480 | if (!test_and_set_bit(STRIPE_ON_UNPLUG_LIST, &sh->state)) | |
4481 | list_add_tail(&sh->lru, &cb->list); | |
4482 | else | |
4483 | release_stripe(sh); | |
4484 | } | |
4485 | ||
620125f2 SL |
4486 | static void make_discard_request(struct mddev *mddev, struct bio *bi) |
4487 | { | |
4488 | struct r5conf *conf = mddev->private; | |
4489 | sector_t logical_sector, last_sector; | |
4490 | struct stripe_head *sh; | |
4491 | int remaining; | |
4492 | int stripe_sectors; | |
4493 | ||
4494 | if (mddev->reshape_position != MaxSector) | |
4495 | /* Skip discard while reshape is happening */ | |
4496 | return; | |
4497 | ||
4f024f37 KO |
4498 | logical_sector = bi->bi_iter.bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
4499 | last_sector = bi->bi_iter.bi_sector + (bi->bi_iter.bi_size>>9); | |
620125f2 SL |
4500 | |
4501 | bi->bi_next = NULL; | |
4502 | bi->bi_phys_segments = 1; /* over-loaded to count active stripes */ | |
4503 | ||
4504 | stripe_sectors = conf->chunk_sectors * | |
4505 | (conf->raid_disks - conf->max_degraded); | |
4506 | logical_sector = DIV_ROUND_UP_SECTOR_T(logical_sector, | |
4507 | stripe_sectors); | |
4508 | sector_div(last_sector, stripe_sectors); | |
4509 | ||
4510 | logical_sector *= conf->chunk_sectors; | |
4511 | last_sector *= conf->chunk_sectors; | |
4512 | ||
4513 | for (; logical_sector < last_sector; | |
4514 | logical_sector += STRIPE_SECTORS) { | |
4515 | DEFINE_WAIT(w); | |
4516 | int d; | |
4517 | again: | |
4518 | sh = get_active_stripe(conf, logical_sector, 0, 0, 0); | |
4519 | prepare_to_wait(&conf->wait_for_overlap, &w, | |
4520 | TASK_UNINTERRUPTIBLE); | |
f8dfcffd N |
4521 | set_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags); |
4522 | if (test_bit(STRIPE_SYNCING, &sh->state)) { | |
4523 | release_stripe(sh); | |
4524 | schedule(); | |
4525 | goto again; | |
4526 | } | |
4527 | clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags); | |
620125f2 SL |
4528 | spin_lock_irq(&sh->stripe_lock); |
4529 | for (d = 0; d < conf->raid_disks; d++) { | |
4530 | if (d == sh->pd_idx || d == sh->qd_idx) | |
4531 | continue; | |
4532 | if (sh->dev[d].towrite || sh->dev[d].toread) { | |
4533 | set_bit(R5_Overlap, &sh->dev[d].flags); | |
4534 | spin_unlock_irq(&sh->stripe_lock); | |
4535 | release_stripe(sh); | |
4536 | schedule(); | |
4537 | goto again; | |
4538 | } | |
4539 | } | |
f8dfcffd | 4540 | set_bit(STRIPE_DISCARD, &sh->state); |
620125f2 SL |
4541 | finish_wait(&conf->wait_for_overlap, &w); |
4542 | for (d = 0; d < conf->raid_disks; d++) { | |
4543 | if (d == sh->pd_idx || d == sh->qd_idx) | |
4544 | continue; | |
4545 | sh->dev[d].towrite = bi; | |
4546 | set_bit(R5_OVERWRITE, &sh->dev[d].flags); | |
4547 | raid5_inc_bi_active_stripes(bi); | |
4548 | } | |
4549 | spin_unlock_irq(&sh->stripe_lock); | |
4550 | if (conf->mddev->bitmap) { | |
4551 | for (d = 0; | |
4552 | d < conf->raid_disks - conf->max_degraded; | |
4553 | d++) | |
4554 | bitmap_startwrite(mddev->bitmap, | |
4555 | sh->sector, | |
4556 | STRIPE_SECTORS, | |
4557 | 0); | |
4558 | sh->bm_seq = conf->seq_flush + 1; | |
4559 | set_bit(STRIPE_BIT_DELAY, &sh->state); | |
4560 | } | |
4561 | ||
4562 | set_bit(STRIPE_HANDLE, &sh->state); | |
4563 | clear_bit(STRIPE_DELAYED, &sh->state); | |
4564 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
4565 | atomic_inc(&conf->preread_active_stripes); | |
4566 | release_stripe_plug(mddev, sh); | |
4567 | } | |
4568 | ||
4569 | remaining = raid5_dec_bi_active_stripes(bi); | |
4570 | if (remaining == 0) { | |
4571 | md_write_end(mddev); | |
4572 | bio_endio(bi, 0); | |
4573 | } | |
4574 | } | |
4575 | ||
b4fdcb02 | 4576 | static void make_request(struct mddev *mddev, struct bio * bi) |
1da177e4 | 4577 | { |
d1688a6d | 4578 | struct r5conf *conf = mddev->private; |
911d4ee8 | 4579 | int dd_idx; |
1da177e4 LT |
4580 | sector_t new_sector; |
4581 | sector_t logical_sector, last_sector; | |
4582 | struct stripe_head *sh; | |
a362357b | 4583 | const int rw = bio_data_dir(bi); |
49077326 | 4584 | int remaining; |
27c0f68f SL |
4585 | DEFINE_WAIT(w); |
4586 | bool do_prepare; | |
1da177e4 | 4587 | |
e9c7469b TH |
4588 | if (unlikely(bi->bi_rw & REQ_FLUSH)) { |
4589 | md_flush_request(mddev, bi); | |
5a7bbad2 | 4590 | return; |
e5dcdd80 N |
4591 | } |
4592 | ||
3d310eb7 | 4593 | md_write_start(mddev, bi); |
06d91a5f | 4594 | |
802ba064 | 4595 | if (rw == READ && |
52488615 | 4596 | mddev->reshape_position == MaxSector && |
21a52c6d | 4597 | chunk_aligned_read(mddev,bi)) |
5a7bbad2 | 4598 | return; |
52488615 | 4599 | |
620125f2 SL |
4600 | if (unlikely(bi->bi_rw & REQ_DISCARD)) { |
4601 | make_discard_request(mddev, bi); | |
4602 | return; | |
4603 | } | |
4604 | ||
4f024f37 | 4605 | logical_sector = bi->bi_iter.bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
f73a1c7d | 4606 | last_sector = bio_end_sector(bi); |
1da177e4 LT |
4607 | bi->bi_next = NULL; |
4608 | bi->bi_phys_segments = 1; /* over-loaded to count active stripes */ | |
06d91a5f | 4609 | |
27c0f68f | 4610 | prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE); |
1da177e4 | 4611 | for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) { |
b5663ba4 | 4612 | int previous; |
c46501b2 | 4613 | int seq; |
b578d55f | 4614 | |
27c0f68f | 4615 | do_prepare = false; |
7ecaa1e6 | 4616 | retry: |
c46501b2 | 4617 | seq = read_seqcount_begin(&conf->gen_lock); |
b5663ba4 | 4618 | previous = 0; |
27c0f68f SL |
4619 | if (do_prepare) |
4620 | prepare_to_wait(&conf->wait_for_overlap, &w, | |
4621 | TASK_UNINTERRUPTIBLE); | |
b0f9ec04 | 4622 | if (unlikely(conf->reshape_progress != MaxSector)) { |
fef9c61f | 4623 | /* spinlock is needed as reshape_progress may be |
df8e7f76 N |
4624 | * 64bit on a 32bit platform, and so it might be |
4625 | * possible to see a half-updated value | |
aeb878b0 | 4626 | * Of course reshape_progress could change after |
df8e7f76 N |
4627 | * the lock is dropped, so once we get a reference |
4628 | * to the stripe that we think it is, we will have | |
4629 | * to check again. | |
4630 | */ | |
7ecaa1e6 | 4631 | spin_lock_irq(&conf->device_lock); |
2c810cdd | 4632 | if (mddev->reshape_backwards |
fef9c61f N |
4633 | ? logical_sector < conf->reshape_progress |
4634 | : logical_sector >= conf->reshape_progress) { | |
b5663ba4 N |
4635 | previous = 1; |
4636 | } else { | |
2c810cdd | 4637 | if (mddev->reshape_backwards |
fef9c61f N |
4638 | ? logical_sector < conf->reshape_safe |
4639 | : logical_sector >= conf->reshape_safe) { | |
b578d55f N |
4640 | spin_unlock_irq(&conf->device_lock); |
4641 | schedule(); | |
27c0f68f | 4642 | do_prepare = true; |
b578d55f N |
4643 | goto retry; |
4644 | } | |
4645 | } | |
7ecaa1e6 N |
4646 | spin_unlock_irq(&conf->device_lock); |
4647 | } | |
16a53ecc | 4648 | |
112bf897 N |
4649 | new_sector = raid5_compute_sector(conf, logical_sector, |
4650 | previous, | |
911d4ee8 | 4651 | &dd_idx, NULL); |
0c55e022 | 4652 | pr_debug("raid456: make_request, sector %llu logical %llu\n", |
c46501b2 | 4653 | (unsigned long long)new_sector, |
1da177e4 LT |
4654 | (unsigned long long)logical_sector); |
4655 | ||
b5663ba4 | 4656 | sh = get_active_stripe(conf, new_sector, previous, |
a8c906ca | 4657 | (bi->bi_rw&RWA_MASK), 0); |
1da177e4 | 4658 | if (sh) { |
b0f9ec04 | 4659 | if (unlikely(previous)) { |
7ecaa1e6 | 4660 | /* expansion might have moved on while waiting for a |
df8e7f76 N |
4661 | * stripe, so we must do the range check again. |
4662 | * Expansion could still move past after this | |
4663 | * test, but as we are holding a reference to | |
4664 | * 'sh', we know that if that happens, | |
4665 | * STRIPE_EXPANDING will get set and the expansion | |
4666 | * won't proceed until we finish with the stripe. | |
7ecaa1e6 N |
4667 | */ |
4668 | int must_retry = 0; | |
4669 | spin_lock_irq(&conf->device_lock); | |
2c810cdd | 4670 | if (mddev->reshape_backwards |
b0f9ec04 N |
4671 | ? logical_sector >= conf->reshape_progress |
4672 | : logical_sector < conf->reshape_progress) | |
7ecaa1e6 N |
4673 | /* mismatch, need to try again */ |
4674 | must_retry = 1; | |
4675 | spin_unlock_irq(&conf->device_lock); | |
4676 | if (must_retry) { | |
4677 | release_stripe(sh); | |
7a3ab908 | 4678 | schedule(); |
27c0f68f | 4679 | do_prepare = true; |
7ecaa1e6 N |
4680 | goto retry; |
4681 | } | |
4682 | } | |
c46501b2 N |
4683 | if (read_seqcount_retry(&conf->gen_lock, seq)) { |
4684 | /* Might have got the wrong stripe_head | |
4685 | * by accident | |
4686 | */ | |
4687 | release_stripe(sh); | |
4688 | goto retry; | |
4689 | } | |
e62e58a5 | 4690 | |
ffd96e35 | 4691 | if (rw == WRITE && |
a5c308d4 | 4692 | logical_sector >= mddev->suspend_lo && |
e464eafd N |
4693 | logical_sector < mddev->suspend_hi) { |
4694 | release_stripe(sh); | |
e62e58a5 N |
4695 | /* As the suspend_* range is controlled by |
4696 | * userspace, we want an interruptible | |
4697 | * wait. | |
4698 | */ | |
4699 | flush_signals(current); | |
4700 | prepare_to_wait(&conf->wait_for_overlap, | |
4701 | &w, TASK_INTERRUPTIBLE); | |
4702 | if (logical_sector >= mddev->suspend_lo && | |
27c0f68f | 4703 | logical_sector < mddev->suspend_hi) { |
e62e58a5 | 4704 | schedule(); |
27c0f68f SL |
4705 | do_prepare = true; |
4706 | } | |
e464eafd N |
4707 | goto retry; |
4708 | } | |
7ecaa1e6 N |
4709 | |
4710 | if (test_bit(STRIPE_EXPANDING, &sh->state) || | |
ffd96e35 | 4711 | !add_stripe_bio(sh, bi, dd_idx, rw)) { |
7ecaa1e6 N |
4712 | /* Stripe is busy expanding or |
4713 | * add failed due to overlap. Flush everything | |
1da177e4 LT |
4714 | * and wait a while |
4715 | */ | |
482c0834 | 4716 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
4717 | release_stripe(sh); |
4718 | schedule(); | |
27c0f68f | 4719 | do_prepare = true; |
1da177e4 LT |
4720 | goto retry; |
4721 | } | |
6ed3003c N |
4722 | set_bit(STRIPE_HANDLE, &sh->state); |
4723 | clear_bit(STRIPE_DELAYED, &sh->state); | |
a852d7b8 | 4724 | if ((bi->bi_rw & REQ_SYNC) && |
729a1866 N |
4725 | !test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) |
4726 | atomic_inc(&conf->preread_active_stripes); | |
8811b596 | 4727 | release_stripe_plug(mddev, sh); |
1da177e4 LT |
4728 | } else { |
4729 | /* cannot get stripe for read-ahead, just give-up */ | |
4730 | clear_bit(BIO_UPTODATE, &bi->bi_flags); | |
1da177e4 LT |
4731 | break; |
4732 | } | |
1da177e4 | 4733 | } |
27c0f68f | 4734 | finish_wait(&conf->wait_for_overlap, &w); |
7c13edc8 | 4735 | |
e7836bd6 | 4736 | remaining = raid5_dec_bi_active_stripes(bi); |
f6344757 | 4737 | if (remaining == 0) { |
1da177e4 | 4738 | |
16a53ecc | 4739 | if ( rw == WRITE ) |
1da177e4 | 4740 | md_write_end(mddev); |
6712ecf8 | 4741 | |
0a82a8d1 LT |
4742 | trace_block_bio_complete(bdev_get_queue(bi->bi_bdev), |
4743 | bi, 0); | |
0e13fe23 | 4744 | bio_endio(bi, 0); |
1da177e4 | 4745 | } |
1da177e4 LT |
4746 | } |
4747 | ||
fd01b88c | 4748 | static sector_t raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks); |
b522adcd | 4749 | |
fd01b88c | 4750 | static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *skipped) |
1da177e4 | 4751 | { |
52c03291 N |
4752 | /* reshaping is quite different to recovery/resync so it is |
4753 | * handled quite separately ... here. | |
4754 | * | |
4755 | * On each call to sync_request, we gather one chunk worth of | |
4756 | * destination stripes and flag them as expanding. | |
4757 | * Then we find all the source stripes and request reads. | |
4758 | * As the reads complete, handle_stripe will copy the data | |
4759 | * into the destination stripe and release that stripe. | |
4760 | */ | |
d1688a6d | 4761 | struct r5conf *conf = mddev->private; |
1da177e4 | 4762 | struct stripe_head *sh; |
ccfcc3c1 | 4763 | sector_t first_sector, last_sector; |
f416885e N |
4764 | int raid_disks = conf->previous_raid_disks; |
4765 | int data_disks = raid_disks - conf->max_degraded; | |
4766 | int new_data_disks = conf->raid_disks - conf->max_degraded; | |
52c03291 N |
4767 | int i; |
4768 | int dd_idx; | |
c8f517c4 | 4769 | sector_t writepos, readpos, safepos; |
ec32a2bd | 4770 | sector_t stripe_addr; |
7a661381 | 4771 | int reshape_sectors; |
ab69ae12 | 4772 | struct list_head stripes; |
52c03291 | 4773 | |
fef9c61f N |
4774 | if (sector_nr == 0) { |
4775 | /* If restarting in the middle, skip the initial sectors */ | |
2c810cdd | 4776 | if (mddev->reshape_backwards && |
fef9c61f N |
4777 | conf->reshape_progress < raid5_size(mddev, 0, 0)) { |
4778 | sector_nr = raid5_size(mddev, 0, 0) | |
4779 | - conf->reshape_progress; | |
2c810cdd | 4780 | } else if (!mddev->reshape_backwards && |
fef9c61f N |
4781 | conf->reshape_progress > 0) |
4782 | sector_nr = conf->reshape_progress; | |
f416885e | 4783 | sector_div(sector_nr, new_data_disks); |
fef9c61f | 4784 | if (sector_nr) { |
8dee7211 N |
4785 | mddev->curr_resync_completed = sector_nr; |
4786 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
fef9c61f N |
4787 | *skipped = 1; |
4788 | return sector_nr; | |
4789 | } | |
52c03291 N |
4790 | } |
4791 | ||
7a661381 N |
4792 | /* We need to process a full chunk at a time. |
4793 | * If old and new chunk sizes differ, we need to process the | |
4794 | * largest of these | |
4795 | */ | |
664e7c41 AN |
4796 | if (mddev->new_chunk_sectors > mddev->chunk_sectors) |
4797 | reshape_sectors = mddev->new_chunk_sectors; | |
7a661381 | 4798 | else |
9d8f0363 | 4799 | reshape_sectors = mddev->chunk_sectors; |
7a661381 | 4800 | |
b5254dd5 N |
4801 | /* We update the metadata at least every 10 seconds, or when |
4802 | * the data about to be copied would over-write the source of | |
4803 | * the data at the front of the range. i.e. one new_stripe | |
4804 | * along from reshape_progress new_maps to after where | |
4805 | * reshape_safe old_maps to | |
52c03291 | 4806 | */ |
fef9c61f | 4807 | writepos = conf->reshape_progress; |
f416885e | 4808 | sector_div(writepos, new_data_disks); |
c8f517c4 N |
4809 | readpos = conf->reshape_progress; |
4810 | sector_div(readpos, data_disks); | |
fef9c61f | 4811 | safepos = conf->reshape_safe; |
f416885e | 4812 | sector_div(safepos, data_disks); |
2c810cdd | 4813 | if (mddev->reshape_backwards) { |
ed37d83e | 4814 | writepos -= min_t(sector_t, reshape_sectors, writepos); |
c8f517c4 | 4815 | readpos += reshape_sectors; |
7a661381 | 4816 | safepos += reshape_sectors; |
fef9c61f | 4817 | } else { |
7a661381 | 4818 | writepos += reshape_sectors; |
ed37d83e N |
4819 | readpos -= min_t(sector_t, reshape_sectors, readpos); |
4820 | safepos -= min_t(sector_t, reshape_sectors, safepos); | |
fef9c61f | 4821 | } |
52c03291 | 4822 | |
b5254dd5 N |
4823 | /* Having calculated the 'writepos' possibly use it |
4824 | * to set 'stripe_addr' which is where we will write to. | |
4825 | */ | |
4826 | if (mddev->reshape_backwards) { | |
4827 | BUG_ON(conf->reshape_progress == 0); | |
4828 | stripe_addr = writepos; | |
4829 | BUG_ON((mddev->dev_sectors & | |
4830 | ~((sector_t)reshape_sectors - 1)) | |
4831 | - reshape_sectors - stripe_addr | |
4832 | != sector_nr); | |
4833 | } else { | |
4834 | BUG_ON(writepos != sector_nr + reshape_sectors); | |
4835 | stripe_addr = sector_nr; | |
4836 | } | |
4837 | ||
c8f517c4 N |
4838 | /* 'writepos' is the most advanced device address we might write. |
4839 | * 'readpos' is the least advanced device address we might read. | |
4840 | * 'safepos' is the least address recorded in the metadata as having | |
4841 | * been reshaped. | |
b5254dd5 N |
4842 | * If there is a min_offset_diff, these are adjusted either by |
4843 | * increasing the safepos/readpos if diff is negative, or | |
4844 | * increasing writepos if diff is positive. | |
4845 | * If 'readpos' is then behind 'writepos', there is no way that we can | |
c8f517c4 N |
4846 | * ensure safety in the face of a crash - that must be done by userspace |
4847 | * making a backup of the data. So in that case there is no particular | |
4848 | * rush to update metadata. | |
4849 | * Otherwise if 'safepos' is behind 'writepos', then we really need to | |
4850 | * update the metadata to advance 'safepos' to match 'readpos' so that | |
4851 | * we can be safe in the event of a crash. | |
4852 | * So we insist on updating metadata if safepos is behind writepos and | |
4853 | * readpos is beyond writepos. | |
4854 | * In any case, update the metadata every 10 seconds. | |
4855 | * Maybe that number should be configurable, but I'm not sure it is | |
4856 | * worth it.... maybe it could be a multiple of safemode_delay??? | |
4857 | */ | |
b5254dd5 N |
4858 | if (conf->min_offset_diff < 0) { |
4859 | safepos += -conf->min_offset_diff; | |
4860 | readpos += -conf->min_offset_diff; | |
4861 | } else | |
4862 | writepos += conf->min_offset_diff; | |
4863 | ||
2c810cdd | 4864 | if ((mddev->reshape_backwards |
c8f517c4 N |
4865 | ? (safepos > writepos && readpos < writepos) |
4866 | : (safepos < writepos && readpos > writepos)) || | |
4867 | time_after(jiffies, conf->reshape_checkpoint + 10*HZ)) { | |
52c03291 N |
4868 | /* Cannot proceed until we've updated the superblock... */ |
4869 | wait_event(conf->wait_for_overlap, | |
c91abf5a N |
4870 | atomic_read(&conf->reshape_stripes)==0 |
4871 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); | |
4872 | if (atomic_read(&conf->reshape_stripes) != 0) | |
4873 | return 0; | |
fef9c61f | 4874 | mddev->reshape_position = conf->reshape_progress; |
75d3da43 | 4875 | mddev->curr_resync_completed = sector_nr; |
c8f517c4 | 4876 | conf->reshape_checkpoint = jiffies; |
850b2b42 | 4877 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
52c03291 | 4878 | md_wakeup_thread(mddev->thread); |
850b2b42 | 4879 | wait_event(mddev->sb_wait, mddev->flags == 0 || |
c91abf5a N |
4880 | test_bit(MD_RECOVERY_INTR, &mddev->recovery)); |
4881 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
4882 | return 0; | |
52c03291 | 4883 | spin_lock_irq(&conf->device_lock); |
fef9c61f | 4884 | conf->reshape_safe = mddev->reshape_position; |
52c03291 N |
4885 | spin_unlock_irq(&conf->device_lock); |
4886 | wake_up(&conf->wait_for_overlap); | |
acb180b0 | 4887 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
52c03291 N |
4888 | } |
4889 | ||
ab69ae12 | 4890 | INIT_LIST_HEAD(&stripes); |
7a661381 | 4891 | for (i = 0; i < reshape_sectors; i += STRIPE_SECTORS) { |
52c03291 | 4892 | int j; |
a9f326eb | 4893 | int skipped_disk = 0; |
a8c906ca | 4894 | sh = get_active_stripe(conf, stripe_addr+i, 0, 0, 1); |
52c03291 N |
4895 | set_bit(STRIPE_EXPANDING, &sh->state); |
4896 | atomic_inc(&conf->reshape_stripes); | |
4897 | /* If any of this stripe is beyond the end of the old | |
4898 | * array, then we need to zero those blocks | |
4899 | */ | |
4900 | for (j=sh->disks; j--;) { | |
4901 | sector_t s; | |
4902 | if (j == sh->pd_idx) | |
4903 | continue; | |
f416885e | 4904 | if (conf->level == 6 && |
d0dabf7e | 4905 | j == sh->qd_idx) |
f416885e | 4906 | continue; |
784052ec | 4907 | s = compute_blocknr(sh, j, 0); |
b522adcd | 4908 | if (s < raid5_size(mddev, 0, 0)) { |
a9f326eb | 4909 | skipped_disk = 1; |
52c03291 N |
4910 | continue; |
4911 | } | |
4912 | memset(page_address(sh->dev[j].page), 0, STRIPE_SIZE); | |
4913 | set_bit(R5_Expanded, &sh->dev[j].flags); | |
4914 | set_bit(R5_UPTODATE, &sh->dev[j].flags); | |
4915 | } | |
a9f326eb | 4916 | if (!skipped_disk) { |
52c03291 N |
4917 | set_bit(STRIPE_EXPAND_READY, &sh->state); |
4918 | set_bit(STRIPE_HANDLE, &sh->state); | |
4919 | } | |
ab69ae12 | 4920 | list_add(&sh->lru, &stripes); |
52c03291 N |
4921 | } |
4922 | spin_lock_irq(&conf->device_lock); | |
2c810cdd | 4923 | if (mddev->reshape_backwards) |
7a661381 | 4924 | conf->reshape_progress -= reshape_sectors * new_data_disks; |
fef9c61f | 4925 | else |
7a661381 | 4926 | conf->reshape_progress += reshape_sectors * new_data_disks; |
52c03291 N |
4927 | spin_unlock_irq(&conf->device_lock); |
4928 | /* Ok, those stripe are ready. We can start scheduling | |
4929 | * reads on the source stripes. | |
4930 | * The source stripes are determined by mapping the first and last | |
4931 | * block on the destination stripes. | |
4932 | */ | |
52c03291 | 4933 | first_sector = |
ec32a2bd | 4934 | raid5_compute_sector(conf, stripe_addr*(new_data_disks), |
911d4ee8 | 4935 | 1, &dd_idx, NULL); |
52c03291 | 4936 | last_sector = |
0e6e0271 | 4937 | raid5_compute_sector(conf, ((stripe_addr+reshape_sectors) |
09c9e5fa | 4938 | * new_data_disks - 1), |
911d4ee8 | 4939 | 1, &dd_idx, NULL); |
58c0fed4 AN |
4940 | if (last_sector >= mddev->dev_sectors) |
4941 | last_sector = mddev->dev_sectors - 1; | |
52c03291 | 4942 | while (first_sector <= last_sector) { |
a8c906ca | 4943 | sh = get_active_stripe(conf, first_sector, 1, 0, 1); |
52c03291 N |
4944 | set_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
4945 | set_bit(STRIPE_HANDLE, &sh->state); | |
4946 | release_stripe(sh); | |
4947 | first_sector += STRIPE_SECTORS; | |
4948 | } | |
ab69ae12 N |
4949 | /* Now that the sources are clearly marked, we can release |
4950 | * the destination stripes | |
4951 | */ | |
4952 | while (!list_empty(&stripes)) { | |
4953 | sh = list_entry(stripes.next, struct stripe_head, lru); | |
4954 | list_del_init(&sh->lru); | |
4955 | release_stripe(sh); | |
4956 | } | |
c6207277 N |
4957 | /* If this takes us to the resync_max point where we have to pause, |
4958 | * then we need to write out the superblock. | |
4959 | */ | |
7a661381 | 4960 | sector_nr += reshape_sectors; |
c03f6a19 N |
4961 | if ((sector_nr - mddev->curr_resync_completed) * 2 |
4962 | >= mddev->resync_max - mddev->curr_resync_completed) { | |
c6207277 N |
4963 | /* Cannot proceed until we've updated the superblock... */ |
4964 | wait_event(conf->wait_for_overlap, | |
c91abf5a N |
4965 | atomic_read(&conf->reshape_stripes) == 0 |
4966 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); | |
4967 | if (atomic_read(&conf->reshape_stripes) != 0) | |
4968 | goto ret; | |
fef9c61f | 4969 | mddev->reshape_position = conf->reshape_progress; |
75d3da43 | 4970 | mddev->curr_resync_completed = sector_nr; |
c8f517c4 | 4971 | conf->reshape_checkpoint = jiffies; |
c6207277 N |
4972 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
4973 | md_wakeup_thread(mddev->thread); | |
4974 | wait_event(mddev->sb_wait, | |
4975 | !test_bit(MD_CHANGE_DEVS, &mddev->flags) | |
c91abf5a N |
4976 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); |
4977 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
4978 | goto ret; | |
c6207277 | 4979 | spin_lock_irq(&conf->device_lock); |
fef9c61f | 4980 | conf->reshape_safe = mddev->reshape_position; |
c6207277 N |
4981 | spin_unlock_irq(&conf->device_lock); |
4982 | wake_up(&conf->wait_for_overlap); | |
acb180b0 | 4983 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
c6207277 | 4984 | } |
c91abf5a | 4985 | ret: |
7a661381 | 4986 | return reshape_sectors; |
52c03291 N |
4987 | } |
4988 | ||
4989 | /* FIXME go_faster isn't used */ | |
fd01b88c | 4990 | static inline sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipped, int go_faster) |
52c03291 | 4991 | { |
d1688a6d | 4992 | struct r5conf *conf = mddev->private; |
52c03291 | 4993 | struct stripe_head *sh; |
58c0fed4 | 4994 | sector_t max_sector = mddev->dev_sectors; |
57dab0bd | 4995 | sector_t sync_blocks; |
16a53ecc N |
4996 | int still_degraded = 0; |
4997 | int i; | |
1da177e4 | 4998 | |
72626685 | 4999 | if (sector_nr >= max_sector) { |
1da177e4 | 5000 | /* just being told to finish up .. nothing much to do */ |
cea9c228 | 5001 | |
29269553 N |
5002 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { |
5003 | end_reshape(conf); | |
5004 | return 0; | |
5005 | } | |
72626685 N |
5006 | |
5007 | if (mddev->curr_resync < max_sector) /* aborted */ | |
5008 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
5009 | &sync_blocks, 1); | |
16a53ecc | 5010 | else /* completed sync */ |
72626685 N |
5011 | conf->fullsync = 0; |
5012 | bitmap_close_sync(mddev->bitmap); | |
5013 | ||
1da177e4 LT |
5014 | return 0; |
5015 | } | |
ccfcc3c1 | 5016 | |
64bd660b N |
5017 | /* Allow raid5_quiesce to complete */ |
5018 | wait_event(conf->wait_for_overlap, conf->quiesce != 2); | |
5019 | ||
52c03291 N |
5020 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
5021 | return reshape_request(mddev, sector_nr, skipped); | |
f6705578 | 5022 | |
c6207277 N |
5023 | /* No need to check resync_max as we never do more than one |
5024 | * stripe, and as resync_max will always be on a chunk boundary, | |
5025 | * if the check in md_do_sync didn't fire, there is no chance | |
5026 | * of overstepping resync_max here | |
5027 | */ | |
5028 | ||
16a53ecc | 5029 | /* if there is too many failed drives and we are trying |
1da177e4 LT |
5030 | * to resync, then assert that we are finished, because there is |
5031 | * nothing we can do. | |
5032 | */ | |
3285edf1 | 5033 | if (mddev->degraded >= conf->max_degraded && |
16a53ecc | 5034 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
58c0fed4 | 5035 | sector_t rv = mddev->dev_sectors - sector_nr; |
57afd89f | 5036 | *skipped = 1; |
1da177e4 LT |
5037 | return rv; |
5038 | } | |
6f608040 | 5039 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
5040 | !conf->fullsync && | |
5041 | !bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && | |
5042 | sync_blocks >= STRIPE_SECTORS) { | |
72626685 N |
5043 | /* we can skip this block, and probably more */ |
5044 | sync_blocks /= STRIPE_SECTORS; | |
5045 | *skipped = 1; | |
5046 | return sync_blocks * STRIPE_SECTORS; /* keep things rounded to whole stripes */ | |
5047 | } | |
1da177e4 | 5048 | |
b47490c9 N |
5049 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); |
5050 | ||
a8c906ca | 5051 | sh = get_active_stripe(conf, sector_nr, 0, 1, 0); |
1da177e4 | 5052 | if (sh == NULL) { |
a8c906ca | 5053 | sh = get_active_stripe(conf, sector_nr, 0, 0, 0); |
1da177e4 | 5054 | /* make sure we don't swamp the stripe cache if someone else |
16a53ecc | 5055 | * is trying to get access |
1da177e4 | 5056 | */ |
66c006a5 | 5057 | schedule_timeout_uninterruptible(1); |
1da177e4 | 5058 | } |
16a53ecc N |
5059 | /* Need to check if array will still be degraded after recovery/resync |
5060 | * We don't need to check the 'failed' flag as when that gets set, | |
5061 | * recovery aborts. | |
5062 | */ | |
f001a70c | 5063 | for (i = 0; i < conf->raid_disks; i++) |
16a53ecc N |
5064 | if (conf->disks[i].rdev == NULL) |
5065 | still_degraded = 1; | |
5066 | ||
5067 | bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded); | |
5068 | ||
83206d66 | 5069 | set_bit(STRIPE_SYNC_REQUESTED, &sh->state); |
053f5b65 | 5070 | set_bit(STRIPE_HANDLE, &sh->state); |
1da177e4 | 5071 | |
1da177e4 LT |
5072 | release_stripe(sh); |
5073 | ||
5074 | return STRIPE_SECTORS; | |
5075 | } | |
5076 | ||
d1688a6d | 5077 | static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio) |
46031f9a RBJ |
5078 | { |
5079 | /* We may not be able to submit a whole bio at once as there | |
5080 | * may not be enough stripe_heads available. | |
5081 | * We cannot pre-allocate enough stripe_heads as we may need | |
5082 | * more than exist in the cache (if we allow ever large chunks). | |
5083 | * So we do one stripe head at a time and record in | |
5084 | * ->bi_hw_segments how many have been done. | |
5085 | * | |
5086 | * We *know* that this entire raid_bio is in one chunk, so | |
5087 | * it will be only one 'dd_idx' and only need one call to raid5_compute_sector. | |
5088 | */ | |
5089 | struct stripe_head *sh; | |
911d4ee8 | 5090 | int dd_idx; |
46031f9a RBJ |
5091 | sector_t sector, logical_sector, last_sector; |
5092 | int scnt = 0; | |
5093 | int remaining; | |
5094 | int handled = 0; | |
5095 | ||
4f024f37 KO |
5096 | logical_sector = raid_bio->bi_iter.bi_sector & |
5097 | ~((sector_t)STRIPE_SECTORS-1); | |
112bf897 | 5098 | sector = raid5_compute_sector(conf, logical_sector, |
911d4ee8 | 5099 | 0, &dd_idx, NULL); |
f73a1c7d | 5100 | last_sector = bio_end_sector(raid_bio); |
46031f9a RBJ |
5101 | |
5102 | for (; logical_sector < last_sector; | |
387bb173 NB |
5103 | logical_sector += STRIPE_SECTORS, |
5104 | sector += STRIPE_SECTORS, | |
5105 | scnt++) { | |
46031f9a | 5106 | |
e7836bd6 | 5107 | if (scnt < raid5_bi_processed_stripes(raid_bio)) |
46031f9a RBJ |
5108 | /* already done this stripe */ |
5109 | continue; | |
5110 | ||
2844dc32 | 5111 | sh = get_active_stripe(conf, sector, 0, 1, 1); |
46031f9a RBJ |
5112 | |
5113 | if (!sh) { | |
5114 | /* failed to get a stripe - must wait */ | |
e7836bd6 | 5115 | raid5_set_bi_processed_stripes(raid_bio, scnt); |
46031f9a RBJ |
5116 | conf->retry_read_aligned = raid_bio; |
5117 | return handled; | |
5118 | } | |
5119 | ||
387bb173 NB |
5120 | if (!add_stripe_bio(sh, raid_bio, dd_idx, 0)) { |
5121 | release_stripe(sh); | |
e7836bd6 | 5122 | raid5_set_bi_processed_stripes(raid_bio, scnt); |
387bb173 NB |
5123 | conf->retry_read_aligned = raid_bio; |
5124 | return handled; | |
5125 | } | |
5126 | ||
3f9e7c14 | 5127 | set_bit(R5_ReadNoMerge, &sh->dev[dd_idx].flags); |
36d1c647 | 5128 | handle_stripe(sh); |
46031f9a RBJ |
5129 | release_stripe(sh); |
5130 | handled++; | |
5131 | } | |
e7836bd6 | 5132 | remaining = raid5_dec_bi_active_stripes(raid_bio); |
0a82a8d1 LT |
5133 | if (remaining == 0) { |
5134 | trace_block_bio_complete(bdev_get_queue(raid_bio->bi_bdev), | |
5135 | raid_bio, 0); | |
0e13fe23 | 5136 | bio_endio(raid_bio, 0); |
0a82a8d1 | 5137 | } |
46031f9a RBJ |
5138 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
5139 | wake_up(&conf->wait_for_stripe); | |
5140 | return handled; | |
5141 | } | |
5142 | ||
bfc90cb0 | 5143 | static int handle_active_stripes(struct r5conf *conf, int group, |
566c09c5 SL |
5144 | struct r5worker *worker, |
5145 | struct list_head *temp_inactive_list) | |
46a06401 SL |
5146 | { |
5147 | struct stripe_head *batch[MAX_STRIPE_BATCH], *sh; | |
566c09c5 SL |
5148 | int i, batch_size = 0, hash; |
5149 | bool release_inactive = false; | |
46a06401 SL |
5150 | |
5151 | while (batch_size < MAX_STRIPE_BATCH && | |
851c30c9 | 5152 | (sh = __get_priority_stripe(conf, group)) != NULL) |
46a06401 SL |
5153 | batch[batch_size++] = sh; |
5154 | ||
566c09c5 SL |
5155 | if (batch_size == 0) { |
5156 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
5157 | if (!list_empty(temp_inactive_list + i)) | |
5158 | break; | |
5159 | if (i == NR_STRIPE_HASH_LOCKS) | |
5160 | return batch_size; | |
5161 | release_inactive = true; | |
5162 | } | |
46a06401 SL |
5163 | spin_unlock_irq(&conf->device_lock); |
5164 | ||
566c09c5 SL |
5165 | release_inactive_stripe_list(conf, temp_inactive_list, |
5166 | NR_STRIPE_HASH_LOCKS); | |
5167 | ||
5168 | if (release_inactive) { | |
5169 | spin_lock_irq(&conf->device_lock); | |
5170 | return 0; | |
5171 | } | |
5172 | ||
46a06401 SL |
5173 | for (i = 0; i < batch_size; i++) |
5174 | handle_stripe(batch[i]); | |
5175 | ||
5176 | cond_resched(); | |
5177 | ||
5178 | spin_lock_irq(&conf->device_lock); | |
566c09c5 SL |
5179 | for (i = 0; i < batch_size; i++) { |
5180 | hash = batch[i]->hash_lock_index; | |
5181 | __release_stripe(conf, batch[i], &temp_inactive_list[hash]); | |
5182 | } | |
46a06401 SL |
5183 | return batch_size; |
5184 | } | |
46031f9a | 5185 | |
851c30c9 SL |
5186 | static void raid5_do_work(struct work_struct *work) |
5187 | { | |
5188 | struct r5worker *worker = container_of(work, struct r5worker, work); | |
5189 | struct r5worker_group *group = worker->group; | |
5190 | struct r5conf *conf = group->conf; | |
5191 | int group_id = group - conf->worker_groups; | |
5192 | int handled; | |
5193 | struct blk_plug plug; | |
5194 | ||
5195 | pr_debug("+++ raid5worker active\n"); | |
5196 | ||
5197 | blk_start_plug(&plug); | |
5198 | handled = 0; | |
5199 | spin_lock_irq(&conf->device_lock); | |
5200 | while (1) { | |
5201 | int batch_size, released; | |
5202 | ||
566c09c5 | 5203 | released = release_stripe_list(conf, worker->temp_inactive_list); |
851c30c9 | 5204 | |
566c09c5 SL |
5205 | batch_size = handle_active_stripes(conf, group_id, worker, |
5206 | worker->temp_inactive_list); | |
bfc90cb0 | 5207 | worker->working = false; |
851c30c9 SL |
5208 | if (!batch_size && !released) |
5209 | break; | |
5210 | handled += batch_size; | |
5211 | } | |
5212 | pr_debug("%d stripes handled\n", handled); | |
5213 | ||
5214 | spin_unlock_irq(&conf->device_lock); | |
5215 | blk_finish_plug(&plug); | |
5216 | ||
5217 | pr_debug("--- raid5worker inactive\n"); | |
5218 | } | |
5219 | ||
1da177e4 LT |
5220 | /* |
5221 | * This is our raid5 kernel thread. | |
5222 | * | |
5223 | * We scan the hash table for stripes which can be handled now. | |
5224 | * During the scan, completed stripes are saved for us by the interrupt | |
5225 | * handler, so that they will not have to wait for our next wakeup. | |
5226 | */ | |
4ed8731d | 5227 | static void raid5d(struct md_thread *thread) |
1da177e4 | 5228 | { |
4ed8731d | 5229 | struct mddev *mddev = thread->mddev; |
d1688a6d | 5230 | struct r5conf *conf = mddev->private; |
1da177e4 | 5231 | int handled; |
e1dfa0a2 | 5232 | struct blk_plug plug; |
1da177e4 | 5233 | |
45b4233c | 5234 | pr_debug("+++ raid5d active\n"); |
1da177e4 LT |
5235 | |
5236 | md_check_recovery(mddev); | |
1da177e4 | 5237 | |
e1dfa0a2 | 5238 | blk_start_plug(&plug); |
1da177e4 LT |
5239 | handled = 0; |
5240 | spin_lock_irq(&conf->device_lock); | |
5241 | while (1) { | |
46031f9a | 5242 | struct bio *bio; |
773ca82f SL |
5243 | int batch_size, released; |
5244 | ||
566c09c5 | 5245 | released = release_stripe_list(conf, conf->temp_inactive_list); |
1da177e4 | 5246 | |
0021b7bc | 5247 | if ( |
7c13edc8 N |
5248 | !list_empty(&conf->bitmap_list)) { |
5249 | /* Now is a good time to flush some bitmap updates */ | |
5250 | conf->seq_flush++; | |
700e432d | 5251 | spin_unlock_irq(&conf->device_lock); |
72626685 | 5252 | bitmap_unplug(mddev->bitmap); |
700e432d | 5253 | spin_lock_irq(&conf->device_lock); |
7c13edc8 | 5254 | conf->seq_write = conf->seq_flush; |
566c09c5 | 5255 | activate_bit_delay(conf, conf->temp_inactive_list); |
72626685 | 5256 | } |
0021b7bc | 5257 | raid5_activate_delayed(conf); |
72626685 | 5258 | |
46031f9a RBJ |
5259 | while ((bio = remove_bio_from_retry(conf))) { |
5260 | int ok; | |
5261 | spin_unlock_irq(&conf->device_lock); | |
5262 | ok = retry_aligned_read(conf, bio); | |
5263 | spin_lock_irq(&conf->device_lock); | |
5264 | if (!ok) | |
5265 | break; | |
5266 | handled++; | |
5267 | } | |
5268 | ||
566c09c5 SL |
5269 | batch_size = handle_active_stripes(conf, ANY_GROUP, NULL, |
5270 | conf->temp_inactive_list); | |
773ca82f | 5271 | if (!batch_size && !released) |
1da177e4 | 5272 | break; |
46a06401 | 5273 | handled += batch_size; |
1da177e4 | 5274 | |
46a06401 SL |
5275 | if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) { |
5276 | spin_unlock_irq(&conf->device_lock); | |
de393cde | 5277 | md_check_recovery(mddev); |
46a06401 SL |
5278 | spin_lock_irq(&conf->device_lock); |
5279 | } | |
1da177e4 | 5280 | } |
45b4233c | 5281 | pr_debug("%d stripes handled\n", handled); |
1da177e4 LT |
5282 | |
5283 | spin_unlock_irq(&conf->device_lock); | |
5284 | ||
c9f21aaf | 5285 | async_tx_issue_pending_all(); |
e1dfa0a2 | 5286 | blk_finish_plug(&plug); |
1da177e4 | 5287 | |
45b4233c | 5288 | pr_debug("--- raid5d inactive\n"); |
1da177e4 LT |
5289 | } |
5290 | ||
3f294f4f | 5291 | static ssize_t |
fd01b88c | 5292 | raid5_show_stripe_cache_size(struct mddev *mddev, char *page) |
3f294f4f | 5293 | { |
d1688a6d | 5294 | struct r5conf *conf = mddev->private; |
96de1e66 N |
5295 | if (conf) |
5296 | return sprintf(page, "%d\n", conf->max_nr_stripes); | |
5297 | else | |
5298 | return 0; | |
3f294f4f N |
5299 | } |
5300 | ||
c41d4ac4 | 5301 | int |
fd01b88c | 5302 | raid5_set_cache_size(struct mddev *mddev, int size) |
3f294f4f | 5303 | { |
d1688a6d | 5304 | struct r5conf *conf = mddev->private; |
b5470dc5 | 5305 | int err; |
566c09c5 | 5306 | int hash; |
b5470dc5 | 5307 | |
c41d4ac4 | 5308 | if (size <= 16 || size > 32768) |
3f294f4f | 5309 | return -EINVAL; |
566c09c5 | 5310 | hash = (conf->max_nr_stripes - 1) % NR_STRIPE_HASH_LOCKS; |
c41d4ac4 | 5311 | while (size < conf->max_nr_stripes) { |
566c09c5 | 5312 | if (drop_one_stripe(conf, hash)) |
3f294f4f N |
5313 | conf->max_nr_stripes--; |
5314 | else | |
5315 | break; | |
566c09c5 SL |
5316 | hash--; |
5317 | if (hash < 0) | |
5318 | hash = NR_STRIPE_HASH_LOCKS - 1; | |
3f294f4f | 5319 | } |
b5470dc5 DW |
5320 | err = md_allow_write(mddev); |
5321 | if (err) | |
5322 | return err; | |
566c09c5 | 5323 | hash = conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS; |
c41d4ac4 | 5324 | while (size > conf->max_nr_stripes) { |
566c09c5 | 5325 | if (grow_one_stripe(conf, hash)) |
3f294f4f N |
5326 | conf->max_nr_stripes++; |
5327 | else break; | |
566c09c5 | 5328 | hash = (hash + 1) % NR_STRIPE_HASH_LOCKS; |
3f294f4f | 5329 | } |
c41d4ac4 N |
5330 | return 0; |
5331 | } | |
5332 | EXPORT_SYMBOL(raid5_set_cache_size); | |
5333 | ||
5334 | static ssize_t | |
fd01b88c | 5335 | raid5_store_stripe_cache_size(struct mddev *mddev, const char *page, size_t len) |
c41d4ac4 | 5336 | { |
d1688a6d | 5337 | struct r5conf *conf = mddev->private; |
c41d4ac4 N |
5338 | unsigned long new; |
5339 | int err; | |
5340 | ||
5341 | if (len >= PAGE_SIZE) | |
5342 | return -EINVAL; | |
5343 | if (!conf) | |
5344 | return -ENODEV; | |
5345 | ||
b29bebd6 | 5346 | if (kstrtoul(page, 10, &new)) |
c41d4ac4 N |
5347 | return -EINVAL; |
5348 | err = raid5_set_cache_size(mddev, new); | |
5349 | if (err) | |
5350 | return err; | |
3f294f4f N |
5351 | return len; |
5352 | } | |
007583c9 | 5353 | |
96de1e66 N |
5354 | static struct md_sysfs_entry |
5355 | raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR, | |
5356 | raid5_show_stripe_cache_size, | |
5357 | raid5_store_stripe_cache_size); | |
3f294f4f | 5358 | |
8b3e6cdc | 5359 | static ssize_t |
fd01b88c | 5360 | raid5_show_preread_threshold(struct mddev *mddev, char *page) |
8b3e6cdc | 5361 | { |
d1688a6d | 5362 | struct r5conf *conf = mddev->private; |
8b3e6cdc DW |
5363 | if (conf) |
5364 | return sprintf(page, "%d\n", conf->bypass_threshold); | |
5365 | else | |
5366 | return 0; | |
5367 | } | |
5368 | ||
5369 | static ssize_t | |
fd01b88c | 5370 | raid5_store_preread_threshold(struct mddev *mddev, const char *page, size_t len) |
8b3e6cdc | 5371 | { |
d1688a6d | 5372 | struct r5conf *conf = mddev->private; |
4ef197d8 | 5373 | unsigned long new; |
8b3e6cdc DW |
5374 | if (len >= PAGE_SIZE) |
5375 | return -EINVAL; | |
5376 | if (!conf) | |
5377 | return -ENODEV; | |
5378 | ||
b29bebd6 | 5379 | if (kstrtoul(page, 10, &new)) |
8b3e6cdc | 5380 | return -EINVAL; |
4ef197d8 | 5381 | if (new > conf->max_nr_stripes) |
8b3e6cdc DW |
5382 | return -EINVAL; |
5383 | conf->bypass_threshold = new; | |
5384 | return len; | |
5385 | } | |
5386 | ||
5387 | static struct md_sysfs_entry | |
5388 | raid5_preread_bypass_threshold = __ATTR(preread_bypass_threshold, | |
5389 | S_IRUGO | S_IWUSR, | |
5390 | raid5_show_preread_threshold, | |
5391 | raid5_store_preread_threshold); | |
5392 | ||
d592a996 SL |
5393 | static ssize_t |
5394 | raid5_show_skip_copy(struct mddev *mddev, char *page) | |
5395 | { | |
5396 | struct r5conf *conf = mddev->private; | |
5397 | if (conf) | |
5398 | return sprintf(page, "%d\n", conf->skip_copy); | |
5399 | else | |
5400 | return 0; | |
5401 | } | |
5402 | ||
5403 | static ssize_t | |
5404 | raid5_store_skip_copy(struct mddev *mddev, const char *page, size_t len) | |
5405 | { | |
5406 | struct r5conf *conf = mddev->private; | |
5407 | unsigned long new; | |
5408 | if (len >= PAGE_SIZE) | |
5409 | return -EINVAL; | |
5410 | if (!conf) | |
5411 | return -ENODEV; | |
5412 | ||
5413 | if (kstrtoul(page, 10, &new)) | |
5414 | return -EINVAL; | |
5415 | new = !!new; | |
5416 | if (new == conf->skip_copy) | |
5417 | return len; | |
5418 | ||
5419 | mddev_suspend(mddev); | |
5420 | conf->skip_copy = new; | |
5421 | if (new) | |
5422 | mddev->queue->backing_dev_info.capabilities |= | |
5423 | BDI_CAP_STABLE_WRITES; | |
5424 | else | |
5425 | mddev->queue->backing_dev_info.capabilities &= | |
5426 | ~BDI_CAP_STABLE_WRITES; | |
5427 | mddev_resume(mddev); | |
5428 | return len; | |
5429 | } | |
5430 | ||
5431 | static struct md_sysfs_entry | |
5432 | raid5_skip_copy = __ATTR(skip_copy, S_IRUGO | S_IWUSR, | |
5433 | raid5_show_skip_copy, | |
5434 | raid5_store_skip_copy); | |
5435 | ||
3f294f4f | 5436 | static ssize_t |
fd01b88c | 5437 | stripe_cache_active_show(struct mddev *mddev, char *page) |
3f294f4f | 5438 | { |
d1688a6d | 5439 | struct r5conf *conf = mddev->private; |
96de1e66 N |
5440 | if (conf) |
5441 | return sprintf(page, "%d\n", atomic_read(&conf->active_stripes)); | |
5442 | else | |
5443 | return 0; | |
3f294f4f N |
5444 | } |
5445 | ||
96de1e66 N |
5446 | static struct md_sysfs_entry |
5447 | raid5_stripecache_active = __ATTR_RO(stripe_cache_active); | |
3f294f4f | 5448 | |
b721420e SL |
5449 | static ssize_t |
5450 | raid5_show_group_thread_cnt(struct mddev *mddev, char *page) | |
5451 | { | |
5452 | struct r5conf *conf = mddev->private; | |
5453 | if (conf) | |
5454 | return sprintf(page, "%d\n", conf->worker_cnt_per_group); | |
5455 | else | |
5456 | return 0; | |
5457 | } | |
5458 | ||
60aaf933 | 5459 | static int alloc_thread_groups(struct r5conf *conf, int cnt, |
5460 | int *group_cnt, | |
5461 | int *worker_cnt_per_group, | |
5462 | struct r5worker_group **worker_groups); | |
b721420e SL |
5463 | static ssize_t |
5464 | raid5_store_group_thread_cnt(struct mddev *mddev, const char *page, size_t len) | |
5465 | { | |
5466 | struct r5conf *conf = mddev->private; | |
5467 | unsigned long new; | |
5468 | int err; | |
60aaf933 | 5469 | struct r5worker_group *new_groups, *old_groups; |
5470 | int group_cnt, worker_cnt_per_group; | |
b721420e SL |
5471 | |
5472 | if (len >= PAGE_SIZE) | |
5473 | return -EINVAL; | |
5474 | if (!conf) | |
5475 | return -ENODEV; | |
5476 | ||
5477 | if (kstrtoul(page, 10, &new)) | |
5478 | return -EINVAL; | |
5479 | ||
5480 | if (new == conf->worker_cnt_per_group) | |
5481 | return len; | |
5482 | ||
5483 | mddev_suspend(mddev); | |
5484 | ||
5485 | old_groups = conf->worker_groups; | |
d206dcfa | 5486 | if (old_groups) |
5487 | flush_workqueue(raid5_wq); | |
5488 | ||
60aaf933 | 5489 | err = alloc_thread_groups(conf, new, |
5490 | &group_cnt, &worker_cnt_per_group, | |
5491 | &new_groups); | |
5492 | if (!err) { | |
5493 | spin_lock_irq(&conf->device_lock); | |
5494 | conf->group_cnt = group_cnt; | |
5495 | conf->worker_cnt_per_group = worker_cnt_per_group; | |
5496 | conf->worker_groups = new_groups; | |
5497 | spin_unlock_irq(&conf->device_lock); | |
b721420e | 5498 | |
b721420e SL |
5499 | if (old_groups) |
5500 | kfree(old_groups[0].workers); | |
5501 | kfree(old_groups); | |
5502 | } | |
5503 | ||
5504 | mddev_resume(mddev); | |
5505 | ||
5506 | if (err) | |
5507 | return err; | |
5508 | return len; | |
5509 | } | |
5510 | ||
5511 | static struct md_sysfs_entry | |
5512 | raid5_group_thread_cnt = __ATTR(group_thread_cnt, S_IRUGO | S_IWUSR, | |
5513 | raid5_show_group_thread_cnt, | |
5514 | raid5_store_group_thread_cnt); | |
5515 | ||
007583c9 | 5516 | static struct attribute *raid5_attrs[] = { |
3f294f4f N |
5517 | &raid5_stripecache_size.attr, |
5518 | &raid5_stripecache_active.attr, | |
8b3e6cdc | 5519 | &raid5_preread_bypass_threshold.attr, |
b721420e | 5520 | &raid5_group_thread_cnt.attr, |
d592a996 | 5521 | &raid5_skip_copy.attr, |
3f294f4f N |
5522 | NULL, |
5523 | }; | |
007583c9 N |
5524 | static struct attribute_group raid5_attrs_group = { |
5525 | .name = NULL, | |
5526 | .attrs = raid5_attrs, | |
3f294f4f N |
5527 | }; |
5528 | ||
60aaf933 | 5529 | static int alloc_thread_groups(struct r5conf *conf, int cnt, |
5530 | int *group_cnt, | |
5531 | int *worker_cnt_per_group, | |
5532 | struct r5worker_group **worker_groups) | |
851c30c9 | 5533 | { |
566c09c5 | 5534 | int i, j, k; |
851c30c9 SL |
5535 | ssize_t size; |
5536 | struct r5worker *workers; | |
5537 | ||
60aaf933 | 5538 | *worker_cnt_per_group = cnt; |
851c30c9 | 5539 | if (cnt == 0) { |
60aaf933 | 5540 | *group_cnt = 0; |
5541 | *worker_groups = NULL; | |
851c30c9 SL |
5542 | return 0; |
5543 | } | |
60aaf933 | 5544 | *group_cnt = num_possible_nodes(); |
851c30c9 | 5545 | size = sizeof(struct r5worker) * cnt; |
60aaf933 | 5546 | workers = kzalloc(size * *group_cnt, GFP_NOIO); |
5547 | *worker_groups = kzalloc(sizeof(struct r5worker_group) * | |
5548 | *group_cnt, GFP_NOIO); | |
5549 | if (!*worker_groups || !workers) { | |
851c30c9 | 5550 | kfree(workers); |
60aaf933 | 5551 | kfree(*worker_groups); |
851c30c9 SL |
5552 | return -ENOMEM; |
5553 | } | |
5554 | ||
60aaf933 | 5555 | for (i = 0; i < *group_cnt; i++) { |
851c30c9 SL |
5556 | struct r5worker_group *group; |
5557 | ||
0c775d52 | 5558 | group = &(*worker_groups)[i]; |
851c30c9 SL |
5559 | INIT_LIST_HEAD(&group->handle_list); |
5560 | group->conf = conf; | |
5561 | group->workers = workers + i * cnt; | |
5562 | ||
5563 | for (j = 0; j < cnt; j++) { | |
566c09c5 SL |
5564 | struct r5worker *worker = group->workers + j; |
5565 | worker->group = group; | |
5566 | INIT_WORK(&worker->work, raid5_do_work); | |
5567 | ||
5568 | for (k = 0; k < NR_STRIPE_HASH_LOCKS; k++) | |
5569 | INIT_LIST_HEAD(worker->temp_inactive_list + k); | |
851c30c9 SL |
5570 | } |
5571 | } | |
5572 | ||
5573 | return 0; | |
5574 | } | |
5575 | ||
5576 | static void free_thread_groups(struct r5conf *conf) | |
5577 | { | |
5578 | if (conf->worker_groups) | |
5579 | kfree(conf->worker_groups[0].workers); | |
5580 | kfree(conf->worker_groups); | |
5581 | conf->worker_groups = NULL; | |
5582 | } | |
5583 | ||
80c3a6ce | 5584 | static sector_t |
fd01b88c | 5585 | raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce | 5586 | { |
d1688a6d | 5587 | struct r5conf *conf = mddev->private; |
80c3a6ce DW |
5588 | |
5589 | if (!sectors) | |
5590 | sectors = mddev->dev_sectors; | |
5e5e3e78 | 5591 | if (!raid_disks) |
7ec05478 | 5592 | /* size is defined by the smallest of previous and new size */ |
5e5e3e78 | 5593 | raid_disks = min(conf->raid_disks, conf->previous_raid_disks); |
80c3a6ce | 5594 | |
9d8f0363 | 5595 | sectors &= ~((sector_t)mddev->chunk_sectors - 1); |
664e7c41 | 5596 | sectors &= ~((sector_t)mddev->new_chunk_sectors - 1); |
80c3a6ce DW |
5597 | return sectors * (raid_disks - conf->max_degraded); |
5598 | } | |
5599 | ||
789b5e03 ON |
5600 | static void free_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu) |
5601 | { | |
5602 | safe_put_page(percpu->spare_page); | |
5603 | kfree(percpu->scribble); | |
5604 | percpu->spare_page = NULL; | |
5605 | percpu->scribble = NULL; | |
5606 | } | |
5607 | ||
5608 | static int alloc_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu) | |
5609 | { | |
5610 | if (conf->level == 6 && !percpu->spare_page) | |
5611 | percpu->spare_page = alloc_page(GFP_KERNEL); | |
5612 | if (!percpu->scribble) | |
5613 | percpu->scribble = kmalloc(conf->scribble_len, GFP_KERNEL); | |
5614 | ||
5615 | if (!percpu->scribble || (conf->level == 6 && !percpu->spare_page)) { | |
5616 | free_scratch_buffer(conf, percpu); | |
5617 | return -ENOMEM; | |
5618 | } | |
5619 | ||
5620 | return 0; | |
5621 | } | |
5622 | ||
d1688a6d | 5623 | static void raid5_free_percpu(struct r5conf *conf) |
36d1c647 | 5624 | { |
36d1c647 DW |
5625 | unsigned long cpu; |
5626 | ||
5627 | if (!conf->percpu) | |
5628 | return; | |
5629 | ||
36d1c647 DW |
5630 | #ifdef CONFIG_HOTPLUG_CPU |
5631 | unregister_cpu_notifier(&conf->cpu_notify); | |
5632 | #endif | |
789b5e03 ON |
5633 | |
5634 | get_online_cpus(); | |
5635 | for_each_possible_cpu(cpu) | |
5636 | free_scratch_buffer(conf, per_cpu_ptr(conf->percpu, cpu)); | |
36d1c647 DW |
5637 | put_online_cpus(); |
5638 | ||
5639 | free_percpu(conf->percpu); | |
5640 | } | |
5641 | ||
d1688a6d | 5642 | static void free_conf(struct r5conf *conf) |
95fc17aa | 5643 | { |
851c30c9 | 5644 | free_thread_groups(conf); |
95fc17aa | 5645 | shrink_stripes(conf); |
36d1c647 | 5646 | raid5_free_percpu(conf); |
95fc17aa DW |
5647 | kfree(conf->disks); |
5648 | kfree(conf->stripe_hashtbl); | |
5649 | kfree(conf); | |
5650 | } | |
5651 | ||
36d1c647 DW |
5652 | #ifdef CONFIG_HOTPLUG_CPU |
5653 | static int raid456_cpu_notify(struct notifier_block *nfb, unsigned long action, | |
5654 | void *hcpu) | |
5655 | { | |
d1688a6d | 5656 | struct r5conf *conf = container_of(nfb, struct r5conf, cpu_notify); |
36d1c647 DW |
5657 | long cpu = (long)hcpu; |
5658 | struct raid5_percpu *percpu = per_cpu_ptr(conf->percpu, cpu); | |
5659 | ||
5660 | switch (action) { | |
5661 | case CPU_UP_PREPARE: | |
5662 | case CPU_UP_PREPARE_FROZEN: | |
789b5e03 | 5663 | if (alloc_scratch_buffer(conf, percpu)) { |
36d1c647 DW |
5664 | pr_err("%s: failed memory allocation for cpu%ld\n", |
5665 | __func__, cpu); | |
55af6bb5 | 5666 | return notifier_from_errno(-ENOMEM); |
36d1c647 DW |
5667 | } |
5668 | break; | |
5669 | case CPU_DEAD: | |
5670 | case CPU_DEAD_FROZEN: | |
789b5e03 | 5671 | free_scratch_buffer(conf, per_cpu_ptr(conf->percpu, cpu)); |
36d1c647 DW |
5672 | break; |
5673 | default: | |
5674 | break; | |
5675 | } | |
5676 | return NOTIFY_OK; | |
5677 | } | |
5678 | #endif | |
5679 | ||
d1688a6d | 5680 | static int raid5_alloc_percpu(struct r5conf *conf) |
36d1c647 DW |
5681 | { |
5682 | unsigned long cpu; | |
789b5e03 | 5683 | int err = 0; |
36d1c647 | 5684 | |
789b5e03 ON |
5685 | conf->percpu = alloc_percpu(struct raid5_percpu); |
5686 | if (!conf->percpu) | |
36d1c647 | 5687 | return -ENOMEM; |
789b5e03 ON |
5688 | |
5689 | #ifdef CONFIG_HOTPLUG_CPU | |
5690 | conf->cpu_notify.notifier_call = raid456_cpu_notify; | |
5691 | conf->cpu_notify.priority = 0; | |
5692 | err = register_cpu_notifier(&conf->cpu_notify); | |
5693 | if (err) | |
5694 | return err; | |
5695 | #endif | |
36d1c647 DW |
5696 | |
5697 | get_online_cpus(); | |
36d1c647 | 5698 | for_each_present_cpu(cpu) { |
789b5e03 ON |
5699 | err = alloc_scratch_buffer(conf, per_cpu_ptr(conf->percpu, cpu)); |
5700 | if (err) { | |
5701 | pr_err("%s: failed memory allocation for cpu%ld\n", | |
5702 | __func__, cpu); | |
36d1c647 DW |
5703 | break; |
5704 | } | |
36d1c647 | 5705 | } |
36d1c647 DW |
5706 | put_online_cpus(); |
5707 | ||
5708 | return err; | |
5709 | } | |
5710 | ||
d1688a6d | 5711 | static struct r5conf *setup_conf(struct mddev *mddev) |
1da177e4 | 5712 | { |
d1688a6d | 5713 | struct r5conf *conf; |
5e5e3e78 | 5714 | int raid_disk, memory, max_disks; |
3cb03002 | 5715 | struct md_rdev *rdev; |
1da177e4 | 5716 | struct disk_info *disk; |
0232605d | 5717 | char pers_name[6]; |
566c09c5 | 5718 | int i; |
60aaf933 | 5719 | int group_cnt, worker_cnt_per_group; |
5720 | struct r5worker_group *new_group; | |
1da177e4 | 5721 | |
91adb564 N |
5722 | if (mddev->new_level != 5 |
5723 | && mddev->new_level != 4 | |
5724 | && mddev->new_level != 6) { | |
0c55e022 | 5725 | printk(KERN_ERR "md/raid:%s: raid level not set to 4/5/6 (%d)\n", |
91adb564 N |
5726 | mdname(mddev), mddev->new_level); |
5727 | return ERR_PTR(-EIO); | |
1da177e4 | 5728 | } |
91adb564 N |
5729 | if ((mddev->new_level == 5 |
5730 | && !algorithm_valid_raid5(mddev->new_layout)) || | |
5731 | (mddev->new_level == 6 | |
5732 | && !algorithm_valid_raid6(mddev->new_layout))) { | |
0c55e022 | 5733 | printk(KERN_ERR "md/raid:%s: layout %d not supported\n", |
91adb564 N |
5734 | mdname(mddev), mddev->new_layout); |
5735 | return ERR_PTR(-EIO); | |
99c0fb5f | 5736 | } |
91adb564 | 5737 | if (mddev->new_level == 6 && mddev->raid_disks < 4) { |
0c55e022 | 5738 | printk(KERN_ERR "md/raid:%s: not enough configured devices (%d, minimum 4)\n", |
91adb564 N |
5739 | mdname(mddev), mddev->raid_disks); |
5740 | return ERR_PTR(-EINVAL); | |
4bbf3771 N |
5741 | } |
5742 | ||
664e7c41 AN |
5743 | if (!mddev->new_chunk_sectors || |
5744 | (mddev->new_chunk_sectors << 9) % PAGE_SIZE || | |
5745 | !is_power_of_2(mddev->new_chunk_sectors)) { | |
0c55e022 N |
5746 | printk(KERN_ERR "md/raid:%s: invalid chunk size %d\n", |
5747 | mdname(mddev), mddev->new_chunk_sectors << 9); | |
91adb564 | 5748 | return ERR_PTR(-EINVAL); |
f6705578 N |
5749 | } |
5750 | ||
d1688a6d | 5751 | conf = kzalloc(sizeof(struct r5conf), GFP_KERNEL); |
91adb564 | 5752 | if (conf == NULL) |
1da177e4 | 5753 | goto abort; |
851c30c9 | 5754 | /* Don't enable multi-threading by default*/ |
60aaf933 | 5755 | if (!alloc_thread_groups(conf, 0, &group_cnt, &worker_cnt_per_group, |
5756 | &new_group)) { | |
5757 | conf->group_cnt = group_cnt; | |
5758 | conf->worker_cnt_per_group = worker_cnt_per_group; | |
5759 | conf->worker_groups = new_group; | |
5760 | } else | |
851c30c9 | 5761 | goto abort; |
f5efd45a | 5762 | spin_lock_init(&conf->device_lock); |
c46501b2 | 5763 | seqcount_init(&conf->gen_lock); |
f5efd45a DW |
5764 | init_waitqueue_head(&conf->wait_for_stripe); |
5765 | init_waitqueue_head(&conf->wait_for_overlap); | |
5766 | INIT_LIST_HEAD(&conf->handle_list); | |
5767 | INIT_LIST_HEAD(&conf->hold_list); | |
5768 | INIT_LIST_HEAD(&conf->delayed_list); | |
5769 | INIT_LIST_HEAD(&conf->bitmap_list); | |
773ca82f | 5770 | init_llist_head(&conf->released_stripes); |
f5efd45a DW |
5771 | atomic_set(&conf->active_stripes, 0); |
5772 | atomic_set(&conf->preread_active_stripes, 0); | |
5773 | atomic_set(&conf->active_aligned_reads, 0); | |
5774 | conf->bypass_threshold = BYPASS_THRESHOLD; | |
d890fa2b | 5775 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
91adb564 N |
5776 | |
5777 | conf->raid_disks = mddev->raid_disks; | |
5778 | if (mddev->reshape_position == MaxSector) | |
5779 | conf->previous_raid_disks = mddev->raid_disks; | |
5780 | else | |
f6705578 | 5781 | conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks; |
5e5e3e78 N |
5782 | max_disks = max(conf->raid_disks, conf->previous_raid_disks); |
5783 | conf->scribble_len = scribble_len(max_disks); | |
f6705578 | 5784 | |
5e5e3e78 | 5785 | conf->disks = kzalloc(max_disks * sizeof(struct disk_info), |
b55e6bfc N |
5786 | GFP_KERNEL); |
5787 | if (!conf->disks) | |
5788 | goto abort; | |
9ffae0cf | 5789 | |
1da177e4 LT |
5790 | conf->mddev = mddev; |
5791 | ||
fccddba0 | 5792 | if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL) |
1da177e4 | 5793 | goto abort; |
1da177e4 | 5794 | |
566c09c5 SL |
5795 | /* We init hash_locks[0] separately to that it can be used |
5796 | * as the reference lock in the spin_lock_nest_lock() call | |
5797 | * in lock_all_device_hash_locks_irq in order to convince | |
5798 | * lockdep that we know what we are doing. | |
5799 | */ | |
5800 | spin_lock_init(conf->hash_locks); | |
5801 | for (i = 1; i < NR_STRIPE_HASH_LOCKS; i++) | |
5802 | spin_lock_init(conf->hash_locks + i); | |
5803 | ||
5804 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
5805 | INIT_LIST_HEAD(conf->inactive_list + i); | |
5806 | ||
5807 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
5808 | INIT_LIST_HEAD(conf->temp_inactive_list + i); | |
5809 | ||
36d1c647 DW |
5810 | conf->level = mddev->new_level; |
5811 | if (raid5_alloc_percpu(conf) != 0) | |
5812 | goto abort; | |
5813 | ||
0c55e022 | 5814 | pr_debug("raid456: run(%s) called.\n", mdname(mddev)); |
1da177e4 | 5815 | |
dafb20fa | 5816 | rdev_for_each(rdev, mddev) { |
1da177e4 | 5817 | raid_disk = rdev->raid_disk; |
5e5e3e78 | 5818 | if (raid_disk >= max_disks |
1da177e4 LT |
5819 | || raid_disk < 0) |
5820 | continue; | |
5821 | disk = conf->disks + raid_disk; | |
5822 | ||
17045f52 N |
5823 | if (test_bit(Replacement, &rdev->flags)) { |
5824 | if (disk->replacement) | |
5825 | goto abort; | |
5826 | disk->replacement = rdev; | |
5827 | } else { | |
5828 | if (disk->rdev) | |
5829 | goto abort; | |
5830 | disk->rdev = rdev; | |
5831 | } | |
1da177e4 | 5832 | |
b2d444d7 | 5833 | if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 | 5834 | char b[BDEVNAME_SIZE]; |
0c55e022 N |
5835 | printk(KERN_INFO "md/raid:%s: device %s operational as raid" |
5836 | " disk %d\n", | |
5837 | mdname(mddev), bdevname(rdev->bdev, b), raid_disk); | |
d6b212f4 | 5838 | } else if (rdev->saved_raid_disk != raid_disk) |
8c2e870a NB |
5839 | /* Cannot rely on bitmap to complete recovery */ |
5840 | conf->fullsync = 1; | |
1da177e4 LT |
5841 | } |
5842 | ||
09c9e5fa | 5843 | conf->chunk_sectors = mddev->new_chunk_sectors; |
91adb564 | 5844 | conf->level = mddev->new_level; |
16a53ecc N |
5845 | if (conf->level == 6) |
5846 | conf->max_degraded = 2; | |
5847 | else | |
5848 | conf->max_degraded = 1; | |
91adb564 | 5849 | conf->algorithm = mddev->new_layout; |
fef9c61f | 5850 | conf->reshape_progress = mddev->reshape_position; |
e183eaed | 5851 | if (conf->reshape_progress != MaxSector) { |
09c9e5fa | 5852 | conf->prev_chunk_sectors = mddev->chunk_sectors; |
e183eaed N |
5853 | conf->prev_algo = mddev->layout; |
5854 | } | |
1da177e4 | 5855 | |
91adb564 | 5856 | memory = conf->max_nr_stripes * (sizeof(struct stripe_head) + |
5e5e3e78 | 5857 | max_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024; |
4bda556a | 5858 | atomic_set(&conf->empty_inactive_list_nr, NR_STRIPE_HASH_LOCKS); |
566c09c5 | 5859 | if (grow_stripes(conf, NR_STRIPES)) { |
91adb564 | 5860 | printk(KERN_ERR |
0c55e022 N |
5861 | "md/raid:%s: couldn't allocate %dkB for buffers\n", |
5862 | mdname(mddev), memory); | |
91adb564 N |
5863 | goto abort; |
5864 | } else | |
0c55e022 N |
5865 | printk(KERN_INFO "md/raid:%s: allocated %dkB\n", |
5866 | mdname(mddev), memory); | |
1da177e4 | 5867 | |
0232605d N |
5868 | sprintf(pers_name, "raid%d", mddev->new_level); |
5869 | conf->thread = md_register_thread(raid5d, mddev, pers_name); | |
91adb564 N |
5870 | if (!conf->thread) { |
5871 | printk(KERN_ERR | |
0c55e022 | 5872 | "md/raid:%s: couldn't allocate thread.\n", |
91adb564 | 5873 | mdname(mddev)); |
16a53ecc N |
5874 | goto abort; |
5875 | } | |
91adb564 N |
5876 | |
5877 | return conf; | |
5878 | ||
5879 | abort: | |
5880 | if (conf) { | |
95fc17aa | 5881 | free_conf(conf); |
91adb564 N |
5882 | return ERR_PTR(-EIO); |
5883 | } else | |
5884 | return ERR_PTR(-ENOMEM); | |
5885 | } | |
5886 | ||
c148ffdc N |
5887 | static int only_parity(int raid_disk, int algo, int raid_disks, int max_degraded) |
5888 | { | |
5889 | switch (algo) { | |
5890 | case ALGORITHM_PARITY_0: | |
5891 | if (raid_disk < max_degraded) | |
5892 | return 1; | |
5893 | break; | |
5894 | case ALGORITHM_PARITY_N: | |
5895 | if (raid_disk >= raid_disks - max_degraded) | |
5896 | return 1; | |
5897 | break; | |
5898 | case ALGORITHM_PARITY_0_6: | |
f72ffdd6 | 5899 | if (raid_disk == 0 || |
c148ffdc N |
5900 | raid_disk == raid_disks - 1) |
5901 | return 1; | |
5902 | break; | |
5903 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
5904 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
5905 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
5906 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
5907 | if (raid_disk == raid_disks - 1) | |
5908 | return 1; | |
5909 | } | |
5910 | return 0; | |
5911 | } | |
5912 | ||
fd01b88c | 5913 | static int run(struct mddev *mddev) |
91adb564 | 5914 | { |
d1688a6d | 5915 | struct r5conf *conf; |
9f7c2220 | 5916 | int working_disks = 0; |
c148ffdc | 5917 | int dirty_parity_disks = 0; |
3cb03002 | 5918 | struct md_rdev *rdev; |
c148ffdc | 5919 | sector_t reshape_offset = 0; |
17045f52 | 5920 | int i; |
b5254dd5 N |
5921 | long long min_offset_diff = 0; |
5922 | int first = 1; | |
91adb564 | 5923 | |
8c6ac868 | 5924 | if (mddev->recovery_cp != MaxSector) |
0c55e022 | 5925 | printk(KERN_NOTICE "md/raid:%s: not clean" |
8c6ac868 AN |
5926 | " -- starting background reconstruction\n", |
5927 | mdname(mddev)); | |
b5254dd5 N |
5928 | |
5929 | rdev_for_each(rdev, mddev) { | |
5930 | long long diff; | |
5931 | if (rdev->raid_disk < 0) | |
5932 | continue; | |
5933 | diff = (rdev->new_data_offset - rdev->data_offset); | |
5934 | if (first) { | |
5935 | min_offset_diff = diff; | |
5936 | first = 0; | |
5937 | } else if (mddev->reshape_backwards && | |
5938 | diff < min_offset_diff) | |
5939 | min_offset_diff = diff; | |
5940 | else if (!mddev->reshape_backwards && | |
5941 | diff > min_offset_diff) | |
5942 | min_offset_diff = diff; | |
5943 | } | |
5944 | ||
91adb564 N |
5945 | if (mddev->reshape_position != MaxSector) { |
5946 | /* Check that we can continue the reshape. | |
b5254dd5 N |
5947 | * Difficulties arise if the stripe we would write to |
5948 | * next is at or after the stripe we would read from next. | |
5949 | * For a reshape that changes the number of devices, this | |
5950 | * is only possible for a very short time, and mdadm makes | |
5951 | * sure that time appears to have past before assembling | |
5952 | * the array. So we fail if that time hasn't passed. | |
5953 | * For a reshape that keeps the number of devices the same | |
5954 | * mdadm must be monitoring the reshape can keeping the | |
5955 | * critical areas read-only and backed up. It will start | |
5956 | * the array in read-only mode, so we check for that. | |
91adb564 N |
5957 | */ |
5958 | sector_t here_new, here_old; | |
5959 | int old_disks; | |
18b00334 | 5960 | int max_degraded = (mddev->level == 6 ? 2 : 1); |
91adb564 | 5961 | |
88ce4930 | 5962 | if (mddev->new_level != mddev->level) { |
0c55e022 | 5963 | printk(KERN_ERR "md/raid:%s: unsupported reshape " |
91adb564 N |
5964 | "required - aborting.\n", |
5965 | mdname(mddev)); | |
5966 | return -EINVAL; | |
5967 | } | |
91adb564 N |
5968 | old_disks = mddev->raid_disks - mddev->delta_disks; |
5969 | /* reshape_position must be on a new-stripe boundary, and one | |
5970 | * further up in new geometry must map after here in old | |
5971 | * geometry. | |
5972 | */ | |
5973 | here_new = mddev->reshape_position; | |
664e7c41 | 5974 | if (sector_div(here_new, mddev->new_chunk_sectors * |
91adb564 | 5975 | (mddev->raid_disks - max_degraded))) { |
0c55e022 N |
5976 | printk(KERN_ERR "md/raid:%s: reshape_position not " |
5977 | "on a stripe boundary\n", mdname(mddev)); | |
91adb564 N |
5978 | return -EINVAL; |
5979 | } | |
c148ffdc | 5980 | reshape_offset = here_new * mddev->new_chunk_sectors; |
91adb564 N |
5981 | /* here_new is the stripe we will write to */ |
5982 | here_old = mddev->reshape_position; | |
9d8f0363 | 5983 | sector_div(here_old, mddev->chunk_sectors * |
91adb564 N |
5984 | (old_disks-max_degraded)); |
5985 | /* here_old is the first stripe that we might need to read | |
5986 | * from */ | |
67ac6011 | 5987 | if (mddev->delta_disks == 0) { |
b5254dd5 N |
5988 | if ((here_new * mddev->new_chunk_sectors != |
5989 | here_old * mddev->chunk_sectors)) { | |
5990 | printk(KERN_ERR "md/raid:%s: reshape position is" | |
5991 | " confused - aborting\n", mdname(mddev)); | |
5992 | return -EINVAL; | |
5993 | } | |
67ac6011 | 5994 | /* We cannot be sure it is safe to start an in-place |
b5254dd5 | 5995 | * reshape. It is only safe if user-space is monitoring |
67ac6011 N |
5996 | * and taking constant backups. |
5997 | * mdadm always starts a situation like this in | |
5998 | * readonly mode so it can take control before | |
5999 | * allowing any writes. So just check for that. | |
6000 | */ | |
b5254dd5 N |
6001 | if (abs(min_offset_diff) >= mddev->chunk_sectors && |
6002 | abs(min_offset_diff) >= mddev->new_chunk_sectors) | |
6003 | /* not really in-place - so OK */; | |
6004 | else if (mddev->ro == 0) { | |
6005 | printk(KERN_ERR "md/raid:%s: in-place reshape " | |
6006 | "must be started in read-only mode " | |
6007 | "- aborting\n", | |
0c55e022 | 6008 | mdname(mddev)); |
67ac6011 N |
6009 | return -EINVAL; |
6010 | } | |
2c810cdd | 6011 | } else if (mddev->reshape_backwards |
b5254dd5 | 6012 | ? (here_new * mddev->new_chunk_sectors + min_offset_diff <= |
67ac6011 N |
6013 | here_old * mddev->chunk_sectors) |
6014 | : (here_new * mddev->new_chunk_sectors >= | |
b5254dd5 | 6015 | here_old * mddev->chunk_sectors + (-min_offset_diff))) { |
91adb564 | 6016 | /* Reading from the same stripe as writing to - bad */ |
0c55e022 N |
6017 | printk(KERN_ERR "md/raid:%s: reshape_position too early for " |
6018 | "auto-recovery - aborting.\n", | |
6019 | mdname(mddev)); | |
91adb564 N |
6020 | return -EINVAL; |
6021 | } | |
0c55e022 N |
6022 | printk(KERN_INFO "md/raid:%s: reshape will continue\n", |
6023 | mdname(mddev)); | |
91adb564 N |
6024 | /* OK, we should be able to continue; */ |
6025 | } else { | |
6026 | BUG_ON(mddev->level != mddev->new_level); | |
6027 | BUG_ON(mddev->layout != mddev->new_layout); | |
664e7c41 | 6028 | BUG_ON(mddev->chunk_sectors != mddev->new_chunk_sectors); |
91adb564 | 6029 | BUG_ON(mddev->delta_disks != 0); |
1da177e4 | 6030 | } |
91adb564 | 6031 | |
245f46c2 N |
6032 | if (mddev->private == NULL) |
6033 | conf = setup_conf(mddev); | |
6034 | else | |
6035 | conf = mddev->private; | |
6036 | ||
91adb564 N |
6037 | if (IS_ERR(conf)) |
6038 | return PTR_ERR(conf); | |
6039 | ||
b5254dd5 | 6040 | conf->min_offset_diff = min_offset_diff; |
91adb564 N |
6041 | mddev->thread = conf->thread; |
6042 | conf->thread = NULL; | |
6043 | mddev->private = conf; | |
6044 | ||
17045f52 N |
6045 | for (i = 0; i < conf->raid_disks && conf->previous_raid_disks; |
6046 | i++) { | |
6047 | rdev = conf->disks[i].rdev; | |
6048 | if (!rdev && conf->disks[i].replacement) { | |
6049 | /* The replacement is all we have yet */ | |
6050 | rdev = conf->disks[i].replacement; | |
6051 | conf->disks[i].replacement = NULL; | |
6052 | clear_bit(Replacement, &rdev->flags); | |
6053 | conf->disks[i].rdev = rdev; | |
6054 | } | |
6055 | if (!rdev) | |
c148ffdc | 6056 | continue; |
17045f52 N |
6057 | if (conf->disks[i].replacement && |
6058 | conf->reshape_progress != MaxSector) { | |
6059 | /* replacements and reshape simply do not mix. */ | |
6060 | printk(KERN_ERR "md: cannot handle concurrent " | |
6061 | "replacement and reshape.\n"); | |
6062 | goto abort; | |
6063 | } | |
2f115882 | 6064 | if (test_bit(In_sync, &rdev->flags)) { |
91adb564 | 6065 | working_disks++; |
2f115882 N |
6066 | continue; |
6067 | } | |
c148ffdc N |
6068 | /* This disc is not fully in-sync. However if it |
6069 | * just stored parity (beyond the recovery_offset), | |
6070 | * when we don't need to be concerned about the | |
6071 | * array being dirty. | |
6072 | * When reshape goes 'backwards', we never have | |
6073 | * partially completed devices, so we only need | |
6074 | * to worry about reshape going forwards. | |
6075 | */ | |
6076 | /* Hack because v0.91 doesn't store recovery_offset properly. */ | |
6077 | if (mddev->major_version == 0 && | |
6078 | mddev->minor_version > 90) | |
6079 | rdev->recovery_offset = reshape_offset; | |
5026d7a9 | 6080 | |
c148ffdc N |
6081 | if (rdev->recovery_offset < reshape_offset) { |
6082 | /* We need to check old and new layout */ | |
6083 | if (!only_parity(rdev->raid_disk, | |
6084 | conf->algorithm, | |
6085 | conf->raid_disks, | |
6086 | conf->max_degraded)) | |
6087 | continue; | |
6088 | } | |
6089 | if (!only_parity(rdev->raid_disk, | |
6090 | conf->prev_algo, | |
6091 | conf->previous_raid_disks, | |
6092 | conf->max_degraded)) | |
6093 | continue; | |
6094 | dirty_parity_disks++; | |
6095 | } | |
91adb564 | 6096 | |
17045f52 N |
6097 | /* |
6098 | * 0 for a fully functional array, 1 or 2 for a degraded array. | |
6099 | */ | |
908f4fbd | 6100 | mddev->degraded = calc_degraded(conf); |
91adb564 | 6101 | |
674806d6 | 6102 | if (has_failed(conf)) { |
0c55e022 | 6103 | printk(KERN_ERR "md/raid:%s: not enough operational devices" |
1da177e4 | 6104 | " (%d/%d failed)\n", |
02c2de8c | 6105 | mdname(mddev), mddev->degraded, conf->raid_disks); |
1da177e4 LT |
6106 | goto abort; |
6107 | } | |
6108 | ||
91adb564 | 6109 | /* device size must be a multiple of chunk size */ |
9d8f0363 | 6110 | mddev->dev_sectors &= ~(mddev->chunk_sectors - 1); |
91adb564 N |
6111 | mddev->resync_max_sectors = mddev->dev_sectors; |
6112 | ||
c148ffdc | 6113 | if (mddev->degraded > dirty_parity_disks && |
1da177e4 | 6114 | mddev->recovery_cp != MaxSector) { |
6ff8d8ec N |
6115 | if (mddev->ok_start_degraded) |
6116 | printk(KERN_WARNING | |
0c55e022 N |
6117 | "md/raid:%s: starting dirty degraded array" |
6118 | " - data corruption possible.\n", | |
6ff8d8ec N |
6119 | mdname(mddev)); |
6120 | else { | |
6121 | printk(KERN_ERR | |
0c55e022 | 6122 | "md/raid:%s: cannot start dirty degraded array.\n", |
6ff8d8ec N |
6123 | mdname(mddev)); |
6124 | goto abort; | |
6125 | } | |
1da177e4 LT |
6126 | } |
6127 | ||
1da177e4 | 6128 | if (mddev->degraded == 0) |
0c55e022 N |
6129 | printk(KERN_INFO "md/raid:%s: raid level %d active with %d out of %d" |
6130 | " devices, algorithm %d\n", mdname(mddev), conf->level, | |
e183eaed N |
6131 | mddev->raid_disks-mddev->degraded, mddev->raid_disks, |
6132 | mddev->new_layout); | |
1da177e4 | 6133 | else |
0c55e022 N |
6134 | printk(KERN_ALERT "md/raid:%s: raid level %d active with %d" |
6135 | " out of %d devices, algorithm %d\n", | |
6136 | mdname(mddev), conf->level, | |
6137 | mddev->raid_disks - mddev->degraded, | |
6138 | mddev->raid_disks, mddev->new_layout); | |
1da177e4 LT |
6139 | |
6140 | print_raid5_conf(conf); | |
6141 | ||
fef9c61f | 6142 | if (conf->reshape_progress != MaxSector) { |
fef9c61f | 6143 | conf->reshape_safe = conf->reshape_progress; |
f6705578 N |
6144 | atomic_set(&conf->reshape_stripes, 0); |
6145 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
6146 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
6147 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
6148 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6149 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
0da3c619 | 6150 | "reshape"); |
f6705578 N |
6151 | } |
6152 | ||
1da177e4 | 6153 | /* Ok, everything is just fine now */ |
a64c876f N |
6154 | if (mddev->to_remove == &raid5_attrs_group) |
6155 | mddev->to_remove = NULL; | |
00bcb4ac N |
6156 | else if (mddev->kobj.sd && |
6157 | sysfs_create_group(&mddev->kobj, &raid5_attrs_group)) | |
5e55e2f5 | 6158 | printk(KERN_WARNING |
4a5add49 | 6159 | "raid5: failed to create sysfs attributes for %s\n", |
5e55e2f5 | 6160 | mdname(mddev)); |
4a5add49 | 6161 | md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); |
7a5febe9 | 6162 | |
4a5add49 | 6163 | if (mddev->queue) { |
9f7c2220 | 6164 | int chunk_size; |
620125f2 | 6165 | bool discard_supported = true; |
4a5add49 N |
6166 | /* read-ahead size must cover two whole stripes, which |
6167 | * is 2 * (datadisks) * chunksize where 'n' is the | |
6168 | * number of raid devices | |
6169 | */ | |
6170 | int data_disks = conf->previous_raid_disks - conf->max_degraded; | |
6171 | int stripe = data_disks * | |
6172 | ((mddev->chunk_sectors << 9) / PAGE_SIZE); | |
6173 | if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe) | |
6174 | mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
91adb564 | 6175 | |
4a5add49 | 6176 | blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec); |
f022b2fd | 6177 | |
11d8a6e3 N |
6178 | mddev->queue->backing_dev_info.congested_data = mddev; |
6179 | mddev->queue->backing_dev_info.congested_fn = raid5_congested; | |
7a5febe9 | 6180 | |
9f7c2220 N |
6181 | chunk_size = mddev->chunk_sectors << 9; |
6182 | blk_queue_io_min(mddev->queue, chunk_size); | |
6183 | blk_queue_io_opt(mddev->queue, chunk_size * | |
6184 | (conf->raid_disks - conf->max_degraded)); | |
c78afc62 | 6185 | mddev->queue->limits.raid_partial_stripes_expensive = 1; |
620125f2 SL |
6186 | /* |
6187 | * We can only discard a whole stripe. It doesn't make sense to | |
6188 | * discard data disk but write parity disk | |
6189 | */ | |
6190 | stripe = stripe * PAGE_SIZE; | |
4ac6875e N |
6191 | /* Round up to power of 2, as discard handling |
6192 | * currently assumes that */ | |
6193 | while ((stripe-1) & stripe) | |
6194 | stripe = (stripe | (stripe-1)) + 1; | |
620125f2 SL |
6195 | mddev->queue->limits.discard_alignment = stripe; |
6196 | mddev->queue->limits.discard_granularity = stripe; | |
6197 | /* | |
6198 | * unaligned part of discard request will be ignored, so can't | |
8e0e99ba | 6199 | * guarantee discard_zeroes_data |
620125f2 SL |
6200 | */ |
6201 | mddev->queue->limits.discard_zeroes_data = 0; | |
8f6c2e4b | 6202 | |
5026d7a9 PA |
6203 | blk_queue_max_write_same_sectors(mddev->queue, 0); |
6204 | ||
05616be5 | 6205 | rdev_for_each(rdev, mddev) { |
9f7c2220 N |
6206 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
6207 | rdev->data_offset << 9); | |
05616be5 N |
6208 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
6209 | rdev->new_data_offset << 9); | |
620125f2 SL |
6210 | /* |
6211 | * discard_zeroes_data is required, otherwise data | |
6212 | * could be lost. Consider a scenario: discard a stripe | |
6213 | * (the stripe could be inconsistent if | |
6214 | * discard_zeroes_data is 0); write one disk of the | |
6215 | * stripe (the stripe could be inconsistent again | |
6216 | * depending on which disks are used to calculate | |
6217 | * parity); the disk is broken; The stripe data of this | |
6218 | * disk is lost. | |
6219 | */ | |
6220 | if (!blk_queue_discard(bdev_get_queue(rdev->bdev)) || | |
6221 | !bdev_get_queue(rdev->bdev)-> | |
6222 | limits.discard_zeroes_data) | |
6223 | discard_supported = false; | |
8e0e99ba N |
6224 | /* Unfortunately, discard_zeroes_data is not currently |
6225 | * a guarantee - just a hint. So we only allow DISCARD | |
6226 | * if the sysadmin has confirmed that only safe devices | |
6227 | * are in use by setting a module parameter. | |
6228 | */ | |
6229 | if (!devices_handle_discard_safely) { | |
6230 | if (discard_supported) { | |
6231 | pr_info("md/raid456: discard support disabled due to uncertainty.\n"); | |
6232 | pr_info("Set raid456.devices_handle_discard_safely=Y to override.\n"); | |
6233 | } | |
6234 | discard_supported = false; | |
6235 | } | |
05616be5 | 6236 | } |
620125f2 SL |
6237 | |
6238 | if (discard_supported && | |
6239 | mddev->queue->limits.max_discard_sectors >= stripe && | |
6240 | mddev->queue->limits.discard_granularity >= stripe) | |
6241 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, | |
6242 | mddev->queue); | |
6243 | else | |
6244 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, | |
6245 | mddev->queue); | |
9f7c2220 | 6246 | } |
23032a0e | 6247 | |
1da177e4 LT |
6248 | return 0; |
6249 | abort: | |
01f96c0a | 6250 | md_unregister_thread(&mddev->thread); |
e4f869d9 N |
6251 | print_raid5_conf(conf); |
6252 | free_conf(conf); | |
1da177e4 | 6253 | mddev->private = NULL; |
0c55e022 | 6254 | printk(KERN_ALERT "md/raid:%s: failed to run raid set.\n", mdname(mddev)); |
1da177e4 LT |
6255 | return -EIO; |
6256 | } | |
6257 | ||
fd01b88c | 6258 | static int stop(struct mddev *mddev) |
1da177e4 | 6259 | { |
d1688a6d | 6260 | struct r5conf *conf = mddev->private; |
1da177e4 | 6261 | |
01f96c0a | 6262 | md_unregister_thread(&mddev->thread); |
11d8a6e3 N |
6263 | if (mddev->queue) |
6264 | mddev->queue->backing_dev_info.congested_fn = NULL; | |
95fc17aa | 6265 | free_conf(conf); |
a64c876f N |
6266 | mddev->private = NULL; |
6267 | mddev->to_remove = &raid5_attrs_group; | |
1da177e4 LT |
6268 | return 0; |
6269 | } | |
6270 | ||
fd01b88c | 6271 | static void status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 6272 | { |
d1688a6d | 6273 | struct r5conf *conf = mddev->private; |
1da177e4 LT |
6274 | int i; |
6275 | ||
9d8f0363 AN |
6276 | seq_printf(seq, " level %d, %dk chunk, algorithm %d", mddev->level, |
6277 | mddev->chunk_sectors / 2, mddev->layout); | |
02c2de8c | 6278 | seq_printf (seq, " [%d/%d] [", conf->raid_disks, conf->raid_disks - mddev->degraded); |
1da177e4 LT |
6279 | for (i = 0; i < conf->raid_disks; i++) |
6280 | seq_printf (seq, "%s", | |
6281 | conf->disks[i].rdev && | |
b2d444d7 | 6282 | test_bit(In_sync, &conf->disks[i].rdev->flags) ? "U" : "_"); |
1da177e4 | 6283 | seq_printf (seq, "]"); |
1da177e4 LT |
6284 | } |
6285 | ||
d1688a6d | 6286 | static void print_raid5_conf (struct r5conf *conf) |
1da177e4 LT |
6287 | { |
6288 | int i; | |
6289 | struct disk_info *tmp; | |
6290 | ||
0c55e022 | 6291 | printk(KERN_DEBUG "RAID conf printout:\n"); |
1da177e4 LT |
6292 | if (!conf) { |
6293 | printk("(conf==NULL)\n"); | |
6294 | return; | |
6295 | } | |
0c55e022 N |
6296 | printk(KERN_DEBUG " --- level:%d rd:%d wd:%d\n", conf->level, |
6297 | conf->raid_disks, | |
6298 | conf->raid_disks - conf->mddev->degraded); | |
1da177e4 LT |
6299 | |
6300 | for (i = 0; i < conf->raid_disks; i++) { | |
6301 | char b[BDEVNAME_SIZE]; | |
6302 | tmp = conf->disks + i; | |
6303 | if (tmp->rdev) | |
0c55e022 N |
6304 | printk(KERN_DEBUG " disk %d, o:%d, dev:%s\n", |
6305 | i, !test_bit(Faulty, &tmp->rdev->flags), | |
6306 | bdevname(tmp->rdev->bdev, b)); | |
1da177e4 LT |
6307 | } |
6308 | } | |
6309 | ||
fd01b88c | 6310 | static int raid5_spare_active(struct mddev *mddev) |
1da177e4 LT |
6311 | { |
6312 | int i; | |
d1688a6d | 6313 | struct r5conf *conf = mddev->private; |
1da177e4 | 6314 | struct disk_info *tmp; |
6b965620 N |
6315 | int count = 0; |
6316 | unsigned long flags; | |
1da177e4 LT |
6317 | |
6318 | for (i = 0; i < conf->raid_disks; i++) { | |
6319 | tmp = conf->disks + i; | |
dd054fce N |
6320 | if (tmp->replacement |
6321 | && tmp->replacement->recovery_offset == MaxSector | |
6322 | && !test_bit(Faulty, &tmp->replacement->flags) | |
6323 | && !test_and_set_bit(In_sync, &tmp->replacement->flags)) { | |
6324 | /* Replacement has just become active. */ | |
6325 | if (!tmp->rdev | |
6326 | || !test_and_clear_bit(In_sync, &tmp->rdev->flags)) | |
6327 | count++; | |
6328 | if (tmp->rdev) { | |
6329 | /* Replaced device not technically faulty, | |
6330 | * but we need to be sure it gets removed | |
6331 | * and never re-added. | |
6332 | */ | |
6333 | set_bit(Faulty, &tmp->rdev->flags); | |
6334 | sysfs_notify_dirent_safe( | |
6335 | tmp->rdev->sysfs_state); | |
6336 | } | |
6337 | sysfs_notify_dirent_safe(tmp->replacement->sysfs_state); | |
6338 | } else if (tmp->rdev | |
70fffd0b | 6339 | && tmp->rdev->recovery_offset == MaxSector |
b2d444d7 | 6340 | && !test_bit(Faulty, &tmp->rdev->flags) |
c04be0aa | 6341 | && !test_and_set_bit(In_sync, &tmp->rdev->flags)) { |
6b965620 | 6342 | count++; |
43c73ca4 | 6343 | sysfs_notify_dirent_safe(tmp->rdev->sysfs_state); |
1da177e4 LT |
6344 | } |
6345 | } | |
6b965620 | 6346 | spin_lock_irqsave(&conf->device_lock, flags); |
908f4fbd | 6347 | mddev->degraded = calc_degraded(conf); |
6b965620 | 6348 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 6349 | print_raid5_conf(conf); |
6b965620 | 6350 | return count; |
1da177e4 LT |
6351 | } |
6352 | ||
b8321b68 | 6353 | static int raid5_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 6354 | { |
d1688a6d | 6355 | struct r5conf *conf = mddev->private; |
1da177e4 | 6356 | int err = 0; |
b8321b68 | 6357 | int number = rdev->raid_disk; |
657e3e4d | 6358 | struct md_rdev **rdevp; |
1da177e4 LT |
6359 | struct disk_info *p = conf->disks + number; |
6360 | ||
6361 | print_raid5_conf(conf); | |
657e3e4d N |
6362 | if (rdev == p->rdev) |
6363 | rdevp = &p->rdev; | |
6364 | else if (rdev == p->replacement) | |
6365 | rdevp = &p->replacement; | |
6366 | else | |
6367 | return 0; | |
6368 | ||
6369 | if (number >= conf->raid_disks && | |
6370 | conf->reshape_progress == MaxSector) | |
6371 | clear_bit(In_sync, &rdev->flags); | |
6372 | ||
6373 | if (test_bit(In_sync, &rdev->flags) || | |
6374 | atomic_read(&rdev->nr_pending)) { | |
6375 | err = -EBUSY; | |
6376 | goto abort; | |
6377 | } | |
6378 | /* Only remove non-faulty devices if recovery | |
6379 | * isn't possible. | |
6380 | */ | |
6381 | if (!test_bit(Faulty, &rdev->flags) && | |
6382 | mddev->recovery_disabled != conf->recovery_disabled && | |
6383 | !has_failed(conf) && | |
dd054fce | 6384 | (!p->replacement || p->replacement == rdev) && |
657e3e4d N |
6385 | number < conf->raid_disks) { |
6386 | err = -EBUSY; | |
6387 | goto abort; | |
6388 | } | |
6389 | *rdevp = NULL; | |
6390 | synchronize_rcu(); | |
6391 | if (atomic_read(&rdev->nr_pending)) { | |
6392 | /* lost the race, try later */ | |
6393 | err = -EBUSY; | |
6394 | *rdevp = rdev; | |
dd054fce N |
6395 | } else if (p->replacement) { |
6396 | /* We must have just cleared 'rdev' */ | |
6397 | p->rdev = p->replacement; | |
6398 | clear_bit(Replacement, &p->replacement->flags); | |
6399 | smp_mb(); /* Make sure other CPUs may see both as identical | |
6400 | * but will never see neither - if they are careful | |
6401 | */ | |
6402 | p->replacement = NULL; | |
6403 | clear_bit(WantReplacement, &rdev->flags); | |
6404 | } else | |
6405 | /* We might have just removed the Replacement as faulty- | |
6406 | * clear the bit just in case | |
6407 | */ | |
6408 | clear_bit(WantReplacement, &rdev->flags); | |
1da177e4 LT |
6409 | abort: |
6410 | ||
6411 | print_raid5_conf(conf); | |
6412 | return err; | |
6413 | } | |
6414 | ||
fd01b88c | 6415 | static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 6416 | { |
d1688a6d | 6417 | struct r5conf *conf = mddev->private; |
199050ea | 6418 | int err = -EEXIST; |
1da177e4 LT |
6419 | int disk; |
6420 | struct disk_info *p; | |
6c2fce2e NB |
6421 | int first = 0; |
6422 | int last = conf->raid_disks - 1; | |
1da177e4 | 6423 | |
7f0da59b N |
6424 | if (mddev->recovery_disabled == conf->recovery_disabled) |
6425 | return -EBUSY; | |
6426 | ||
dc10c643 | 6427 | if (rdev->saved_raid_disk < 0 && has_failed(conf)) |
1da177e4 | 6428 | /* no point adding a device */ |
199050ea | 6429 | return -EINVAL; |
1da177e4 | 6430 | |
6c2fce2e NB |
6431 | if (rdev->raid_disk >= 0) |
6432 | first = last = rdev->raid_disk; | |
1da177e4 LT |
6433 | |
6434 | /* | |
16a53ecc N |
6435 | * find the disk ... but prefer rdev->saved_raid_disk |
6436 | * if possible. | |
1da177e4 | 6437 | */ |
16a53ecc | 6438 | if (rdev->saved_raid_disk >= 0 && |
6c2fce2e | 6439 | rdev->saved_raid_disk >= first && |
16a53ecc | 6440 | conf->disks[rdev->saved_raid_disk].rdev == NULL) |
5cfb22a1 N |
6441 | first = rdev->saved_raid_disk; |
6442 | ||
6443 | for (disk = first; disk <= last; disk++) { | |
7bfec5f3 N |
6444 | p = conf->disks + disk; |
6445 | if (p->rdev == NULL) { | |
b2d444d7 | 6446 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 6447 | rdev->raid_disk = disk; |
199050ea | 6448 | err = 0; |
72626685 N |
6449 | if (rdev->saved_raid_disk != disk) |
6450 | conf->fullsync = 1; | |
d6065f7b | 6451 | rcu_assign_pointer(p->rdev, rdev); |
5cfb22a1 | 6452 | goto out; |
1da177e4 | 6453 | } |
5cfb22a1 N |
6454 | } |
6455 | for (disk = first; disk <= last; disk++) { | |
6456 | p = conf->disks + disk; | |
7bfec5f3 N |
6457 | if (test_bit(WantReplacement, &p->rdev->flags) && |
6458 | p->replacement == NULL) { | |
6459 | clear_bit(In_sync, &rdev->flags); | |
6460 | set_bit(Replacement, &rdev->flags); | |
6461 | rdev->raid_disk = disk; | |
6462 | err = 0; | |
6463 | conf->fullsync = 1; | |
6464 | rcu_assign_pointer(p->replacement, rdev); | |
6465 | break; | |
6466 | } | |
6467 | } | |
5cfb22a1 | 6468 | out: |
1da177e4 | 6469 | print_raid5_conf(conf); |
199050ea | 6470 | return err; |
1da177e4 LT |
6471 | } |
6472 | ||
fd01b88c | 6473 | static int raid5_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
6474 | { |
6475 | /* no resync is happening, and there is enough space | |
6476 | * on all devices, so we can resize. | |
6477 | * We need to make sure resync covers any new space. | |
6478 | * If the array is shrinking we should possibly wait until | |
6479 | * any io in the removed space completes, but it hardly seems | |
6480 | * worth it. | |
6481 | */ | |
a4a6125a | 6482 | sector_t newsize; |
9d8f0363 | 6483 | sectors &= ~((sector_t)mddev->chunk_sectors - 1); |
a4a6125a N |
6484 | newsize = raid5_size(mddev, sectors, mddev->raid_disks); |
6485 | if (mddev->external_size && | |
6486 | mddev->array_sectors > newsize) | |
b522adcd | 6487 | return -EINVAL; |
a4a6125a N |
6488 | if (mddev->bitmap) { |
6489 | int ret = bitmap_resize(mddev->bitmap, sectors, 0, 0); | |
6490 | if (ret) | |
6491 | return ret; | |
6492 | } | |
6493 | md_set_array_sectors(mddev, newsize); | |
f233ea5c | 6494 | set_capacity(mddev->gendisk, mddev->array_sectors); |
449aad3e | 6495 | revalidate_disk(mddev->gendisk); |
b098636c N |
6496 | if (sectors > mddev->dev_sectors && |
6497 | mddev->recovery_cp > mddev->dev_sectors) { | |
58c0fed4 | 6498 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
6499 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
6500 | } | |
58c0fed4 | 6501 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 6502 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
6503 | return 0; |
6504 | } | |
6505 | ||
fd01b88c | 6506 | static int check_stripe_cache(struct mddev *mddev) |
01ee22b4 N |
6507 | { |
6508 | /* Can only proceed if there are plenty of stripe_heads. | |
6509 | * We need a minimum of one full stripe,, and for sensible progress | |
6510 | * it is best to have about 4 times that. | |
6511 | * If we require 4 times, then the default 256 4K stripe_heads will | |
6512 | * allow for chunk sizes up to 256K, which is probably OK. | |
6513 | * If the chunk size is greater, user-space should request more | |
6514 | * stripe_heads first. | |
6515 | */ | |
d1688a6d | 6516 | struct r5conf *conf = mddev->private; |
01ee22b4 N |
6517 | if (((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4 |
6518 | > conf->max_nr_stripes || | |
6519 | ((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4 | |
6520 | > conf->max_nr_stripes) { | |
0c55e022 N |
6521 | printk(KERN_WARNING "md/raid:%s: reshape: not enough stripes. Needed %lu\n", |
6522 | mdname(mddev), | |
01ee22b4 N |
6523 | ((max(mddev->chunk_sectors, mddev->new_chunk_sectors) << 9) |
6524 | / STRIPE_SIZE)*4); | |
6525 | return 0; | |
6526 | } | |
6527 | return 1; | |
6528 | } | |
6529 | ||
fd01b88c | 6530 | static int check_reshape(struct mddev *mddev) |
29269553 | 6531 | { |
d1688a6d | 6532 | struct r5conf *conf = mddev->private; |
29269553 | 6533 | |
88ce4930 N |
6534 | if (mddev->delta_disks == 0 && |
6535 | mddev->new_layout == mddev->layout && | |
664e7c41 | 6536 | mddev->new_chunk_sectors == mddev->chunk_sectors) |
50ac168a | 6537 | return 0; /* nothing to do */ |
674806d6 | 6538 | if (has_failed(conf)) |
ec32a2bd | 6539 | return -EINVAL; |
fdcfbbb6 | 6540 | if (mddev->delta_disks < 0 && mddev->reshape_position == MaxSector) { |
ec32a2bd N |
6541 | /* We might be able to shrink, but the devices must |
6542 | * be made bigger first. | |
6543 | * For raid6, 4 is the minimum size. | |
6544 | * Otherwise 2 is the minimum | |
6545 | */ | |
6546 | int min = 2; | |
6547 | if (mddev->level == 6) | |
6548 | min = 4; | |
6549 | if (mddev->raid_disks + mddev->delta_disks < min) | |
6550 | return -EINVAL; | |
6551 | } | |
29269553 | 6552 | |
01ee22b4 | 6553 | if (!check_stripe_cache(mddev)) |
29269553 | 6554 | return -ENOSPC; |
29269553 | 6555 | |
e56108d6 N |
6556 | return resize_stripes(conf, (conf->previous_raid_disks |
6557 | + mddev->delta_disks)); | |
63c70c4f N |
6558 | } |
6559 | ||
fd01b88c | 6560 | static int raid5_start_reshape(struct mddev *mddev) |
63c70c4f | 6561 | { |
d1688a6d | 6562 | struct r5conf *conf = mddev->private; |
3cb03002 | 6563 | struct md_rdev *rdev; |
63c70c4f | 6564 | int spares = 0; |
c04be0aa | 6565 | unsigned long flags; |
63c70c4f | 6566 | |
f416885e | 6567 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
63c70c4f N |
6568 | return -EBUSY; |
6569 | ||
01ee22b4 N |
6570 | if (!check_stripe_cache(mddev)) |
6571 | return -ENOSPC; | |
6572 | ||
30b67645 N |
6573 | if (has_failed(conf)) |
6574 | return -EINVAL; | |
6575 | ||
c6563a8c | 6576 | rdev_for_each(rdev, mddev) { |
469518a3 N |
6577 | if (!test_bit(In_sync, &rdev->flags) |
6578 | && !test_bit(Faulty, &rdev->flags)) | |
29269553 | 6579 | spares++; |
c6563a8c | 6580 | } |
63c70c4f | 6581 | |
f416885e | 6582 | if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded) |
29269553 N |
6583 | /* Not enough devices even to make a degraded array |
6584 | * of that size | |
6585 | */ | |
6586 | return -EINVAL; | |
6587 | ||
ec32a2bd N |
6588 | /* Refuse to reduce size of the array. Any reductions in |
6589 | * array size must be through explicit setting of array_size | |
6590 | * attribute. | |
6591 | */ | |
6592 | if (raid5_size(mddev, 0, conf->raid_disks + mddev->delta_disks) | |
6593 | < mddev->array_sectors) { | |
0c55e022 | 6594 | printk(KERN_ERR "md/raid:%s: array size must be reduced " |
ec32a2bd N |
6595 | "before number of disks\n", mdname(mddev)); |
6596 | return -EINVAL; | |
6597 | } | |
6598 | ||
f6705578 | 6599 | atomic_set(&conf->reshape_stripes, 0); |
29269553 | 6600 | spin_lock_irq(&conf->device_lock); |
c46501b2 | 6601 | write_seqcount_begin(&conf->gen_lock); |
29269553 | 6602 | conf->previous_raid_disks = conf->raid_disks; |
63c70c4f | 6603 | conf->raid_disks += mddev->delta_disks; |
09c9e5fa AN |
6604 | conf->prev_chunk_sectors = conf->chunk_sectors; |
6605 | conf->chunk_sectors = mddev->new_chunk_sectors; | |
88ce4930 N |
6606 | conf->prev_algo = conf->algorithm; |
6607 | conf->algorithm = mddev->new_layout; | |
05616be5 N |
6608 | conf->generation++; |
6609 | /* Code that selects data_offset needs to see the generation update | |
6610 | * if reshape_progress has been set - so a memory barrier needed. | |
6611 | */ | |
6612 | smp_mb(); | |
2c810cdd | 6613 | if (mddev->reshape_backwards) |
fef9c61f N |
6614 | conf->reshape_progress = raid5_size(mddev, 0, 0); |
6615 | else | |
6616 | conf->reshape_progress = 0; | |
6617 | conf->reshape_safe = conf->reshape_progress; | |
c46501b2 | 6618 | write_seqcount_end(&conf->gen_lock); |
29269553 N |
6619 | spin_unlock_irq(&conf->device_lock); |
6620 | ||
4d77e3ba N |
6621 | /* Now make sure any requests that proceeded on the assumption |
6622 | * the reshape wasn't running - like Discard or Read - have | |
6623 | * completed. | |
6624 | */ | |
6625 | mddev_suspend(mddev); | |
6626 | mddev_resume(mddev); | |
6627 | ||
29269553 N |
6628 | /* Add some new drives, as many as will fit. |
6629 | * We know there are enough to make the newly sized array work. | |
3424bf6a N |
6630 | * Don't add devices if we are reducing the number of |
6631 | * devices in the array. This is because it is not possible | |
6632 | * to correctly record the "partially reconstructed" state of | |
6633 | * such devices during the reshape and confusion could result. | |
29269553 | 6634 | */ |
87a8dec9 | 6635 | if (mddev->delta_disks >= 0) { |
dafb20fa | 6636 | rdev_for_each(rdev, mddev) |
87a8dec9 N |
6637 | if (rdev->raid_disk < 0 && |
6638 | !test_bit(Faulty, &rdev->flags)) { | |
6639 | if (raid5_add_disk(mddev, rdev) == 0) { | |
87a8dec9 | 6640 | if (rdev->raid_disk |
9d4c7d87 | 6641 | >= conf->previous_raid_disks) |
87a8dec9 | 6642 | set_bit(In_sync, &rdev->flags); |
9d4c7d87 | 6643 | else |
87a8dec9 | 6644 | rdev->recovery_offset = 0; |
36fad858 NK |
6645 | |
6646 | if (sysfs_link_rdev(mddev, rdev)) | |
87a8dec9 | 6647 | /* Failure here is OK */; |
50da0840 | 6648 | } |
87a8dec9 N |
6649 | } else if (rdev->raid_disk >= conf->previous_raid_disks |
6650 | && !test_bit(Faulty, &rdev->flags)) { | |
6651 | /* This is a spare that was manually added */ | |
6652 | set_bit(In_sync, &rdev->flags); | |
87a8dec9 | 6653 | } |
29269553 | 6654 | |
87a8dec9 N |
6655 | /* When a reshape changes the number of devices, |
6656 | * ->degraded is measured against the larger of the | |
6657 | * pre and post number of devices. | |
6658 | */ | |
ec32a2bd | 6659 | spin_lock_irqsave(&conf->device_lock, flags); |
908f4fbd | 6660 | mddev->degraded = calc_degraded(conf); |
ec32a2bd N |
6661 | spin_unlock_irqrestore(&conf->device_lock, flags); |
6662 | } | |
63c70c4f | 6663 | mddev->raid_disks = conf->raid_disks; |
e516402c | 6664 | mddev->reshape_position = conf->reshape_progress; |
850b2b42 | 6665 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
f6705578 | 6666 | |
29269553 N |
6667 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
6668 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
6669 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
6670 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6671 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
0da3c619 | 6672 | "reshape"); |
29269553 N |
6673 | if (!mddev->sync_thread) { |
6674 | mddev->recovery = 0; | |
6675 | spin_lock_irq(&conf->device_lock); | |
ba8805b9 | 6676 | write_seqcount_begin(&conf->gen_lock); |
29269553 | 6677 | mddev->raid_disks = conf->raid_disks = conf->previous_raid_disks; |
ba8805b9 N |
6678 | mddev->new_chunk_sectors = |
6679 | conf->chunk_sectors = conf->prev_chunk_sectors; | |
6680 | mddev->new_layout = conf->algorithm = conf->prev_algo; | |
05616be5 N |
6681 | rdev_for_each(rdev, mddev) |
6682 | rdev->new_data_offset = rdev->data_offset; | |
6683 | smp_wmb(); | |
ba8805b9 | 6684 | conf->generation --; |
fef9c61f | 6685 | conf->reshape_progress = MaxSector; |
1e3fa9bd | 6686 | mddev->reshape_position = MaxSector; |
ba8805b9 | 6687 | write_seqcount_end(&conf->gen_lock); |
29269553 N |
6688 | spin_unlock_irq(&conf->device_lock); |
6689 | return -EAGAIN; | |
6690 | } | |
c8f517c4 | 6691 | conf->reshape_checkpoint = jiffies; |
29269553 N |
6692 | md_wakeup_thread(mddev->sync_thread); |
6693 | md_new_event(mddev); | |
6694 | return 0; | |
6695 | } | |
29269553 | 6696 | |
ec32a2bd N |
6697 | /* This is called from the reshape thread and should make any |
6698 | * changes needed in 'conf' | |
6699 | */ | |
d1688a6d | 6700 | static void end_reshape(struct r5conf *conf) |
29269553 | 6701 | { |
29269553 | 6702 | |
f6705578 | 6703 | if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
05616be5 | 6704 | struct md_rdev *rdev; |
f6705578 | 6705 | |
f6705578 | 6706 | spin_lock_irq(&conf->device_lock); |
cea9c228 | 6707 | conf->previous_raid_disks = conf->raid_disks; |
05616be5 N |
6708 | rdev_for_each(rdev, conf->mddev) |
6709 | rdev->data_offset = rdev->new_data_offset; | |
6710 | smp_wmb(); | |
fef9c61f | 6711 | conf->reshape_progress = MaxSector; |
f6705578 | 6712 | spin_unlock_irq(&conf->device_lock); |
b0f9ec04 | 6713 | wake_up(&conf->wait_for_overlap); |
16a53ecc N |
6714 | |
6715 | /* read-ahead size must cover two whole stripes, which is | |
6716 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices | |
6717 | */ | |
4a5add49 | 6718 | if (conf->mddev->queue) { |
cea9c228 | 6719 | int data_disks = conf->raid_disks - conf->max_degraded; |
09c9e5fa | 6720 | int stripe = data_disks * ((conf->chunk_sectors << 9) |
cea9c228 | 6721 | / PAGE_SIZE); |
16a53ecc N |
6722 | if (conf->mddev->queue->backing_dev_info.ra_pages < 2 * stripe) |
6723 | conf->mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
6724 | } | |
29269553 | 6725 | } |
29269553 N |
6726 | } |
6727 | ||
ec32a2bd N |
6728 | /* This is called from the raid5d thread with mddev_lock held. |
6729 | * It makes config changes to the device. | |
6730 | */ | |
fd01b88c | 6731 | static void raid5_finish_reshape(struct mddev *mddev) |
cea9c228 | 6732 | { |
d1688a6d | 6733 | struct r5conf *conf = mddev->private; |
cea9c228 N |
6734 | |
6735 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
6736 | ||
ec32a2bd N |
6737 | if (mddev->delta_disks > 0) { |
6738 | md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); | |
6739 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e | 6740 | revalidate_disk(mddev->gendisk); |
ec32a2bd N |
6741 | } else { |
6742 | int d; | |
908f4fbd N |
6743 | spin_lock_irq(&conf->device_lock); |
6744 | mddev->degraded = calc_degraded(conf); | |
6745 | spin_unlock_irq(&conf->device_lock); | |
ec32a2bd N |
6746 | for (d = conf->raid_disks ; |
6747 | d < conf->raid_disks - mddev->delta_disks; | |
1a67dde0 | 6748 | d++) { |
3cb03002 | 6749 | struct md_rdev *rdev = conf->disks[d].rdev; |
da7613b8 N |
6750 | if (rdev) |
6751 | clear_bit(In_sync, &rdev->flags); | |
6752 | rdev = conf->disks[d].replacement; | |
6753 | if (rdev) | |
6754 | clear_bit(In_sync, &rdev->flags); | |
1a67dde0 | 6755 | } |
cea9c228 | 6756 | } |
88ce4930 | 6757 | mddev->layout = conf->algorithm; |
09c9e5fa | 6758 | mddev->chunk_sectors = conf->chunk_sectors; |
ec32a2bd N |
6759 | mddev->reshape_position = MaxSector; |
6760 | mddev->delta_disks = 0; | |
2c810cdd | 6761 | mddev->reshape_backwards = 0; |
cea9c228 N |
6762 | } |
6763 | } | |
6764 | ||
fd01b88c | 6765 | static void raid5_quiesce(struct mddev *mddev, int state) |
72626685 | 6766 | { |
d1688a6d | 6767 | struct r5conf *conf = mddev->private; |
72626685 N |
6768 | |
6769 | switch(state) { | |
e464eafd N |
6770 | case 2: /* resume for a suspend */ |
6771 | wake_up(&conf->wait_for_overlap); | |
6772 | break; | |
6773 | ||
72626685 | 6774 | case 1: /* stop all writes */ |
566c09c5 | 6775 | lock_all_device_hash_locks_irq(conf); |
64bd660b N |
6776 | /* '2' tells resync/reshape to pause so that all |
6777 | * active stripes can drain | |
6778 | */ | |
6779 | conf->quiesce = 2; | |
566c09c5 | 6780 | wait_event_cmd(conf->wait_for_stripe, |
46031f9a RBJ |
6781 | atomic_read(&conf->active_stripes) == 0 && |
6782 | atomic_read(&conf->active_aligned_reads) == 0, | |
566c09c5 SL |
6783 | unlock_all_device_hash_locks_irq(conf), |
6784 | lock_all_device_hash_locks_irq(conf)); | |
64bd660b | 6785 | conf->quiesce = 1; |
566c09c5 | 6786 | unlock_all_device_hash_locks_irq(conf); |
64bd660b N |
6787 | /* allow reshape to continue */ |
6788 | wake_up(&conf->wait_for_overlap); | |
72626685 N |
6789 | break; |
6790 | ||
6791 | case 0: /* re-enable writes */ | |
566c09c5 | 6792 | lock_all_device_hash_locks_irq(conf); |
72626685 N |
6793 | conf->quiesce = 0; |
6794 | wake_up(&conf->wait_for_stripe); | |
e464eafd | 6795 | wake_up(&conf->wait_for_overlap); |
566c09c5 | 6796 | unlock_all_device_hash_locks_irq(conf); |
72626685 N |
6797 | break; |
6798 | } | |
72626685 | 6799 | } |
b15c2e57 | 6800 | |
fd01b88c | 6801 | static void *raid45_takeover_raid0(struct mddev *mddev, int level) |
54071b38 | 6802 | { |
e373ab10 | 6803 | struct r0conf *raid0_conf = mddev->private; |
d76c8420 | 6804 | sector_t sectors; |
54071b38 | 6805 | |
f1b29bca | 6806 | /* for raid0 takeover only one zone is supported */ |
e373ab10 | 6807 | if (raid0_conf->nr_strip_zones > 1) { |
0c55e022 N |
6808 | printk(KERN_ERR "md/raid:%s: cannot takeover raid0 with more than one zone.\n", |
6809 | mdname(mddev)); | |
f1b29bca DW |
6810 | return ERR_PTR(-EINVAL); |
6811 | } | |
6812 | ||
e373ab10 N |
6813 | sectors = raid0_conf->strip_zone[0].zone_end; |
6814 | sector_div(sectors, raid0_conf->strip_zone[0].nb_dev); | |
3b71bd93 | 6815 | mddev->dev_sectors = sectors; |
f1b29bca | 6816 | mddev->new_level = level; |
54071b38 TM |
6817 | mddev->new_layout = ALGORITHM_PARITY_N; |
6818 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
6819 | mddev->raid_disks += 1; | |
6820 | mddev->delta_disks = 1; | |
6821 | /* make sure it will be not marked as dirty */ | |
6822 | mddev->recovery_cp = MaxSector; | |
6823 | ||
6824 | return setup_conf(mddev); | |
6825 | } | |
6826 | ||
fd01b88c | 6827 | static void *raid5_takeover_raid1(struct mddev *mddev) |
d562b0c4 N |
6828 | { |
6829 | int chunksect; | |
6830 | ||
6831 | if (mddev->raid_disks != 2 || | |
6832 | mddev->degraded > 1) | |
6833 | return ERR_PTR(-EINVAL); | |
6834 | ||
6835 | /* Should check if there are write-behind devices? */ | |
6836 | ||
6837 | chunksect = 64*2; /* 64K by default */ | |
6838 | ||
6839 | /* The array must be an exact multiple of chunksize */ | |
6840 | while (chunksect && (mddev->array_sectors & (chunksect-1))) | |
6841 | chunksect >>= 1; | |
6842 | ||
6843 | if ((chunksect<<9) < STRIPE_SIZE) | |
6844 | /* array size does not allow a suitable chunk size */ | |
6845 | return ERR_PTR(-EINVAL); | |
6846 | ||
6847 | mddev->new_level = 5; | |
6848 | mddev->new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
664e7c41 | 6849 | mddev->new_chunk_sectors = chunksect; |
d562b0c4 N |
6850 | |
6851 | return setup_conf(mddev); | |
6852 | } | |
6853 | ||
fd01b88c | 6854 | static void *raid5_takeover_raid6(struct mddev *mddev) |
fc9739c6 N |
6855 | { |
6856 | int new_layout; | |
6857 | ||
6858 | switch (mddev->layout) { | |
6859 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
6860 | new_layout = ALGORITHM_LEFT_ASYMMETRIC; | |
6861 | break; | |
6862 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
6863 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC; | |
6864 | break; | |
6865 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
6866 | new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
6867 | break; | |
6868 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
6869 | new_layout = ALGORITHM_RIGHT_SYMMETRIC; | |
6870 | break; | |
6871 | case ALGORITHM_PARITY_0_6: | |
6872 | new_layout = ALGORITHM_PARITY_0; | |
6873 | break; | |
6874 | case ALGORITHM_PARITY_N: | |
6875 | new_layout = ALGORITHM_PARITY_N; | |
6876 | break; | |
6877 | default: | |
6878 | return ERR_PTR(-EINVAL); | |
6879 | } | |
6880 | mddev->new_level = 5; | |
6881 | mddev->new_layout = new_layout; | |
6882 | mddev->delta_disks = -1; | |
6883 | mddev->raid_disks -= 1; | |
6884 | return setup_conf(mddev); | |
6885 | } | |
6886 | ||
fd01b88c | 6887 | static int raid5_check_reshape(struct mddev *mddev) |
b3546035 | 6888 | { |
88ce4930 N |
6889 | /* For a 2-drive array, the layout and chunk size can be changed |
6890 | * immediately as not restriping is needed. | |
6891 | * For larger arrays we record the new value - after validation | |
6892 | * to be used by a reshape pass. | |
b3546035 | 6893 | */ |
d1688a6d | 6894 | struct r5conf *conf = mddev->private; |
597a711b | 6895 | int new_chunk = mddev->new_chunk_sectors; |
b3546035 | 6896 | |
597a711b | 6897 | if (mddev->new_layout >= 0 && !algorithm_valid_raid5(mddev->new_layout)) |
b3546035 N |
6898 | return -EINVAL; |
6899 | if (new_chunk > 0) { | |
0ba459d2 | 6900 | if (!is_power_of_2(new_chunk)) |
b3546035 | 6901 | return -EINVAL; |
597a711b | 6902 | if (new_chunk < (PAGE_SIZE>>9)) |
b3546035 | 6903 | return -EINVAL; |
597a711b | 6904 | if (mddev->array_sectors & (new_chunk-1)) |
b3546035 N |
6905 | /* not factor of array size */ |
6906 | return -EINVAL; | |
6907 | } | |
6908 | ||
6909 | /* They look valid */ | |
6910 | ||
88ce4930 | 6911 | if (mddev->raid_disks == 2) { |
597a711b N |
6912 | /* can make the change immediately */ |
6913 | if (mddev->new_layout >= 0) { | |
6914 | conf->algorithm = mddev->new_layout; | |
6915 | mddev->layout = mddev->new_layout; | |
88ce4930 N |
6916 | } |
6917 | if (new_chunk > 0) { | |
597a711b N |
6918 | conf->chunk_sectors = new_chunk ; |
6919 | mddev->chunk_sectors = new_chunk; | |
88ce4930 N |
6920 | } |
6921 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
6922 | md_wakeup_thread(mddev->thread); | |
b3546035 | 6923 | } |
50ac168a | 6924 | return check_reshape(mddev); |
88ce4930 N |
6925 | } |
6926 | ||
fd01b88c | 6927 | static int raid6_check_reshape(struct mddev *mddev) |
88ce4930 | 6928 | { |
597a711b | 6929 | int new_chunk = mddev->new_chunk_sectors; |
50ac168a | 6930 | |
597a711b | 6931 | if (mddev->new_layout >= 0 && !algorithm_valid_raid6(mddev->new_layout)) |
88ce4930 | 6932 | return -EINVAL; |
b3546035 | 6933 | if (new_chunk > 0) { |
0ba459d2 | 6934 | if (!is_power_of_2(new_chunk)) |
88ce4930 | 6935 | return -EINVAL; |
597a711b | 6936 | if (new_chunk < (PAGE_SIZE >> 9)) |
88ce4930 | 6937 | return -EINVAL; |
597a711b | 6938 | if (mddev->array_sectors & (new_chunk-1)) |
88ce4930 N |
6939 | /* not factor of array size */ |
6940 | return -EINVAL; | |
b3546035 | 6941 | } |
88ce4930 N |
6942 | |
6943 | /* They look valid */ | |
50ac168a | 6944 | return check_reshape(mddev); |
b3546035 N |
6945 | } |
6946 | ||
fd01b88c | 6947 | static void *raid5_takeover(struct mddev *mddev) |
d562b0c4 N |
6948 | { |
6949 | /* raid5 can take over: | |
f1b29bca | 6950 | * raid0 - if there is only one strip zone - make it a raid4 layout |
d562b0c4 N |
6951 | * raid1 - if there are two drives. We need to know the chunk size |
6952 | * raid4 - trivial - just use a raid4 layout. | |
6953 | * raid6 - Providing it is a *_6 layout | |
d562b0c4 | 6954 | */ |
f1b29bca DW |
6955 | if (mddev->level == 0) |
6956 | return raid45_takeover_raid0(mddev, 5); | |
d562b0c4 N |
6957 | if (mddev->level == 1) |
6958 | return raid5_takeover_raid1(mddev); | |
e9d4758f N |
6959 | if (mddev->level == 4) { |
6960 | mddev->new_layout = ALGORITHM_PARITY_N; | |
6961 | mddev->new_level = 5; | |
6962 | return setup_conf(mddev); | |
6963 | } | |
fc9739c6 N |
6964 | if (mddev->level == 6) |
6965 | return raid5_takeover_raid6(mddev); | |
d562b0c4 N |
6966 | |
6967 | return ERR_PTR(-EINVAL); | |
6968 | } | |
6969 | ||
fd01b88c | 6970 | static void *raid4_takeover(struct mddev *mddev) |
a78d38a1 | 6971 | { |
f1b29bca DW |
6972 | /* raid4 can take over: |
6973 | * raid0 - if there is only one strip zone | |
6974 | * raid5 - if layout is right | |
a78d38a1 | 6975 | */ |
f1b29bca DW |
6976 | if (mddev->level == 0) |
6977 | return raid45_takeover_raid0(mddev, 4); | |
a78d38a1 N |
6978 | if (mddev->level == 5 && |
6979 | mddev->layout == ALGORITHM_PARITY_N) { | |
6980 | mddev->new_layout = 0; | |
6981 | mddev->new_level = 4; | |
6982 | return setup_conf(mddev); | |
6983 | } | |
6984 | return ERR_PTR(-EINVAL); | |
6985 | } | |
d562b0c4 | 6986 | |
84fc4b56 | 6987 | static struct md_personality raid5_personality; |
245f46c2 | 6988 | |
fd01b88c | 6989 | static void *raid6_takeover(struct mddev *mddev) |
245f46c2 N |
6990 | { |
6991 | /* Currently can only take over a raid5. We map the | |
6992 | * personality to an equivalent raid6 personality | |
6993 | * with the Q block at the end. | |
6994 | */ | |
6995 | int new_layout; | |
6996 | ||
6997 | if (mddev->pers != &raid5_personality) | |
6998 | return ERR_PTR(-EINVAL); | |
6999 | if (mddev->degraded > 1) | |
7000 | return ERR_PTR(-EINVAL); | |
7001 | if (mddev->raid_disks > 253) | |
7002 | return ERR_PTR(-EINVAL); | |
7003 | if (mddev->raid_disks < 3) | |
7004 | return ERR_PTR(-EINVAL); | |
7005 | ||
7006 | switch (mddev->layout) { | |
7007 | case ALGORITHM_LEFT_ASYMMETRIC: | |
7008 | new_layout = ALGORITHM_LEFT_ASYMMETRIC_6; | |
7009 | break; | |
7010 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
7011 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC_6; | |
7012 | break; | |
7013 | case ALGORITHM_LEFT_SYMMETRIC: | |
7014 | new_layout = ALGORITHM_LEFT_SYMMETRIC_6; | |
7015 | break; | |
7016 | case ALGORITHM_RIGHT_SYMMETRIC: | |
7017 | new_layout = ALGORITHM_RIGHT_SYMMETRIC_6; | |
7018 | break; | |
7019 | case ALGORITHM_PARITY_0: | |
7020 | new_layout = ALGORITHM_PARITY_0_6; | |
7021 | break; | |
7022 | case ALGORITHM_PARITY_N: | |
7023 | new_layout = ALGORITHM_PARITY_N; | |
7024 | break; | |
7025 | default: | |
7026 | return ERR_PTR(-EINVAL); | |
7027 | } | |
7028 | mddev->new_level = 6; | |
7029 | mddev->new_layout = new_layout; | |
7030 | mddev->delta_disks = 1; | |
7031 | mddev->raid_disks += 1; | |
7032 | return setup_conf(mddev); | |
7033 | } | |
7034 | ||
84fc4b56 | 7035 | static struct md_personality raid6_personality = |
16a53ecc N |
7036 | { |
7037 | .name = "raid6", | |
7038 | .level = 6, | |
7039 | .owner = THIS_MODULE, | |
7040 | .make_request = make_request, | |
7041 | .run = run, | |
7042 | .stop = stop, | |
7043 | .status = status, | |
7044 | .error_handler = error, | |
7045 | .hot_add_disk = raid5_add_disk, | |
7046 | .hot_remove_disk= raid5_remove_disk, | |
7047 | .spare_active = raid5_spare_active, | |
7048 | .sync_request = sync_request, | |
7049 | .resize = raid5_resize, | |
80c3a6ce | 7050 | .size = raid5_size, |
50ac168a | 7051 | .check_reshape = raid6_check_reshape, |
f416885e | 7052 | .start_reshape = raid5_start_reshape, |
cea9c228 | 7053 | .finish_reshape = raid5_finish_reshape, |
16a53ecc | 7054 | .quiesce = raid5_quiesce, |
245f46c2 | 7055 | .takeover = raid6_takeover, |
16a53ecc | 7056 | }; |
84fc4b56 | 7057 | static struct md_personality raid5_personality = |
1da177e4 LT |
7058 | { |
7059 | .name = "raid5", | |
2604b703 | 7060 | .level = 5, |
1da177e4 LT |
7061 | .owner = THIS_MODULE, |
7062 | .make_request = make_request, | |
7063 | .run = run, | |
7064 | .stop = stop, | |
7065 | .status = status, | |
7066 | .error_handler = error, | |
7067 | .hot_add_disk = raid5_add_disk, | |
7068 | .hot_remove_disk= raid5_remove_disk, | |
7069 | .spare_active = raid5_spare_active, | |
7070 | .sync_request = sync_request, | |
7071 | .resize = raid5_resize, | |
80c3a6ce | 7072 | .size = raid5_size, |
63c70c4f N |
7073 | .check_reshape = raid5_check_reshape, |
7074 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 7075 | .finish_reshape = raid5_finish_reshape, |
72626685 | 7076 | .quiesce = raid5_quiesce, |
d562b0c4 | 7077 | .takeover = raid5_takeover, |
1da177e4 LT |
7078 | }; |
7079 | ||
84fc4b56 | 7080 | static struct md_personality raid4_personality = |
1da177e4 | 7081 | { |
2604b703 N |
7082 | .name = "raid4", |
7083 | .level = 4, | |
7084 | .owner = THIS_MODULE, | |
7085 | .make_request = make_request, | |
7086 | .run = run, | |
7087 | .stop = stop, | |
7088 | .status = status, | |
7089 | .error_handler = error, | |
7090 | .hot_add_disk = raid5_add_disk, | |
7091 | .hot_remove_disk= raid5_remove_disk, | |
7092 | .spare_active = raid5_spare_active, | |
7093 | .sync_request = sync_request, | |
7094 | .resize = raid5_resize, | |
80c3a6ce | 7095 | .size = raid5_size, |
3d37890b N |
7096 | .check_reshape = raid5_check_reshape, |
7097 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 7098 | .finish_reshape = raid5_finish_reshape, |
2604b703 | 7099 | .quiesce = raid5_quiesce, |
a78d38a1 | 7100 | .takeover = raid4_takeover, |
2604b703 N |
7101 | }; |
7102 | ||
7103 | static int __init raid5_init(void) | |
7104 | { | |
851c30c9 SL |
7105 | raid5_wq = alloc_workqueue("raid5wq", |
7106 | WQ_UNBOUND|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE|WQ_SYSFS, 0); | |
7107 | if (!raid5_wq) | |
7108 | return -ENOMEM; | |
16a53ecc | 7109 | register_md_personality(&raid6_personality); |
2604b703 N |
7110 | register_md_personality(&raid5_personality); |
7111 | register_md_personality(&raid4_personality); | |
7112 | return 0; | |
1da177e4 LT |
7113 | } |
7114 | ||
2604b703 | 7115 | static void raid5_exit(void) |
1da177e4 | 7116 | { |
16a53ecc | 7117 | unregister_md_personality(&raid6_personality); |
2604b703 N |
7118 | unregister_md_personality(&raid5_personality); |
7119 | unregister_md_personality(&raid4_personality); | |
851c30c9 | 7120 | destroy_workqueue(raid5_wq); |
1da177e4 LT |
7121 | } |
7122 | ||
7123 | module_init(raid5_init); | |
7124 | module_exit(raid5_exit); | |
7125 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 7126 | MODULE_DESCRIPTION("RAID4/5/6 (striping with parity) personality for MD"); |
1da177e4 | 7127 | MODULE_ALIAS("md-personality-4"); /* RAID5 */ |
d9d166c2 N |
7128 | MODULE_ALIAS("md-raid5"); |
7129 | MODULE_ALIAS("md-raid4"); | |
2604b703 N |
7130 | MODULE_ALIAS("md-level-5"); |
7131 | MODULE_ALIAS("md-level-4"); | |
16a53ecc N |
7132 | MODULE_ALIAS("md-personality-8"); /* RAID6 */ |
7133 | MODULE_ALIAS("md-raid6"); | |
7134 | MODULE_ALIAS("md-level-6"); | |
7135 | ||
7136 | /* This used to be two separate modules, they were: */ | |
7137 | MODULE_ALIAS("raid5"); | |
7138 | MODULE_ALIAS("raid6"); |