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Commit | Line | Data |
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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> |
46d5b785 | 57 | #include <linux/flex_array.h> |
a9add5d9 N |
58 | #include <trace/events/block.h> |
59 | ||
43b2e5d8 | 60 | #include "md.h" |
bff61975 | 61 | #include "raid5.h" |
54071b38 | 62 | #include "raid0.h" |
ef740c37 | 63 | #include "bitmap.h" |
72626685 | 64 | |
394ed8e4 SL |
65 | #define UNSUPPORTED_MDDEV_FLAGS (1L << MD_FAILFAST_SUPPORTED) |
66 | ||
851c30c9 SL |
67 | #define cpu_to_group(cpu) cpu_to_node(cpu) |
68 | #define ANY_GROUP NUMA_NO_NODE | |
69 | ||
8e0e99ba N |
70 | static bool devices_handle_discard_safely = false; |
71 | module_param(devices_handle_discard_safely, bool, 0644); | |
72 | MODULE_PARM_DESC(devices_handle_discard_safely, | |
73 | "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions"); | |
851c30c9 | 74 | static struct workqueue_struct *raid5_wq; |
1da177e4 | 75 | |
d1688a6d | 76 | static inline struct hlist_head *stripe_hash(struct r5conf *conf, sector_t sect) |
db298e19 N |
77 | { |
78 | int hash = (sect >> STRIPE_SHIFT) & HASH_MASK; | |
79 | return &conf->stripe_hashtbl[hash]; | |
80 | } | |
1da177e4 | 81 | |
566c09c5 SL |
82 | static inline int stripe_hash_locks_hash(sector_t sect) |
83 | { | |
84 | return (sect >> STRIPE_SHIFT) & STRIPE_HASH_LOCKS_MASK; | |
85 | } | |
86 | ||
87 | static inline void lock_device_hash_lock(struct r5conf *conf, int hash) | |
88 | { | |
89 | spin_lock_irq(conf->hash_locks + hash); | |
90 | spin_lock(&conf->device_lock); | |
91 | } | |
92 | ||
93 | static inline void unlock_device_hash_lock(struct r5conf *conf, int hash) | |
94 | { | |
95 | spin_unlock(&conf->device_lock); | |
96 | spin_unlock_irq(conf->hash_locks + hash); | |
97 | } | |
98 | ||
99 | static inline void lock_all_device_hash_locks_irq(struct r5conf *conf) | |
100 | { | |
101 | int i; | |
102 | local_irq_disable(); | |
103 | spin_lock(conf->hash_locks); | |
104 | for (i = 1; i < NR_STRIPE_HASH_LOCKS; i++) | |
105 | spin_lock_nest_lock(conf->hash_locks + i, conf->hash_locks); | |
106 | spin_lock(&conf->device_lock); | |
107 | } | |
108 | ||
109 | static inline void unlock_all_device_hash_locks_irq(struct r5conf *conf) | |
110 | { | |
111 | int i; | |
112 | spin_unlock(&conf->device_lock); | |
113 | for (i = NR_STRIPE_HASH_LOCKS; i; i--) | |
114 | spin_unlock(conf->hash_locks + i - 1); | |
115 | local_irq_enable(); | |
116 | } | |
117 | ||
d0dabf7e N |
118 | /* Find first data disk in a raid6 stripe */ |
119 | static inline int raid6_d0(struct stripe_head *sh) | |
120 | { | |
67cc2b81 N |
121 | if (sh->ddf_layout) |
122 | /* ddf always start from first device */ | |
123 | return 0; | |
124 | /* md starts just after Q block */ | |
d0dabf7e N |
125 | if (sh->qd_idx == sh->disks - 1) |
126 | return 0; | |
127 | else | |
128 | return sh->qd_idx + 1; | |
129 | } | |
16a53ecc N |
130 | static inline int raid6_next_disk(int disk, int raid_disks) |
131 | { | |
132 | disk++; | |
133 | return (disk < raid_disks) ? disk : 0; | |
134 | } | |
a4456856 | 135 | |
d0dabf7e N |
136 | /* When walking through the disks in a raid5, starting at raid6_d0, |
137 | * We need to map each disk to a 'slot', where the data disks are slot | |
138 | * 0 .. raid_disks-3, the parity disk is raid_disks-2 and the Q disk | |
139 | * is raid_disks-1. This help does that mapping. | |
140 | */ | |
67cc2b81 N |
141 | static int raid6_idx_to_slot(int idx, struct stripe_head *sh, |
142 | int *count, int syndrome_disks) | |
d0dabf7e | 143 | { |
6629542e | 144 | int slot = *count; |
67cc2b81 | 145 | |
e4424fee | 146 | if (sh->ddf_layout) |
6629542e | 147 | (*count)++; |
d0dabf7e | 148 | if (idx == sh->pd_idx) |
67cc2b81 | 149 | return syndrome_disks; |
d0dabf7e | 150 | if (idx == sh->qd_idx) |
67cc2b81 | 151 | return syndrome_disks + 1; |
e4424fee | 152 | if (!sh->ddf_layout) |
6629542e | 153 | (*count)++; |
d0dabf7e N |
154 | return slot; |
155 | } | |
156 | ||
34a6f80e | 157 | static void return_io(struct bio_list *return_bi) |
a4456856 | 158 | { |
34a6f80e N |
159 | struct bio *bi; |
160 | while ((bi = bio_list_pop(return_bi)) != NULL) { | |
4f024f37 | 161 | bi->bi_iter.bi_size = 0; |
0a82a8d1 LT |
162 | trace_block_bio_complete(bdev_get_queue(bi->bi_bdev), |
163 | bi, 0); | |
4246a0b6 | 164 | bio_endio(bi); |
a4456856 DW |
165 | } |
166 | } | |
167 | ||
d1688a6d | 168 | static void print_raid5_conf (struct r5conf *conf); |
1da177e4 | 169 | |
600aa109 DW |
170 | static int stripe_operations_active(struct stripe_head *sh) |
171 | { | |
172 | return sh->check_state || sh->reconstruct_state || | |
173 | test_bit(STRIPE_BIOFILL_RUN, &sh->state) || | |
174 | test_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
175 | } | |
176 | ||
851c30c9 SL |
177 | static void raid5_wakeup_stripe_thread(struct stripe_head *sh) |
178 | { | |
179 | struct r5conf *conf = sh->raid_conf; | |
180 | struct r5worker_group *group; | |
bfc90cb0 | 181 | int thread_cnt; |
851c30c9 SL |
182 | int i, cpu = sh->cpu; |
183 | ||
184 | if (!cpu_online(cpu)) { | |
185 | cpu = cpumask_any(cpu_online_mask); | |
186 | sh->cpu = cpu; | |
187 | } | |
188 | ||
189 | if (list_empty(&sh->lru)) { | |
190 | struct r5worker_group *group; | |
191 | group = conf->worker_groups + cpu_to_group(cpu); | |
192 | list_add_tail(&sh->lru, &group->handle_list); | |
bfc90cb0 SL |
193 | group->stripes_cnt++; |
194 | sh->group = group; | |
851c30c9 SL |
195 | } |
196 | ||
197 | if (conf->worker_cnt_per_group == 0) { | |
198 | md_wakeup_thread(conf->mddev->thread); | |
199 | return; | |
200 | } | |
201 | ||
202 | group = conf->worker_groups + cpu_to_group(sh->cpu); | |
203 | ||
bfc90cb0 SL |
204 | group->workers[0].working = true; |
205 | /* at least one worker should run to avoid race */ | |
206 | queue_work_on(sh->cpu, raid5_wq, &group->workers[0].work); | |
207 | ||
208 | thread_cnt = group->stripes_cnt / MAX_STRIPE_BATCH - 1; | |
209 | /* wakeup more workers */ | |
210 | for (i = 1; i < conf->worker_cnt_per_group && thread_cnt > 0; i++) { | |
211 | if (group->workers[i].working == false) { | |
212 | group->workers[i].working = true; | |
213 | queue_work_on(sh->cpu, raid5_wq, | |
214 | &group->workers[i].work); | |
215 | thread_cnt--; | |
216 | } | |
217 | } | |
851c30c9 SL |
218 | } |
219 | ||
566c09c5 SL |
220 | static void do_release_stripe(struct r5conf *conf, struct stripe_head *sh, |
221 | struct list_head *temp_inactive_list) | |
1da177e4 | 222 | { |
1e6d690b SL |
223 | int i; |
224 | int injournal = 0; /* number of date pages with R5_InJournal */ | |
225 | ||
4eb788df SL |
226 | BUG_ON(!list_empty(&sh->lru)); |
227 | BUG_ON(atomic_read(&conf->active_stripes)==0); | |
1e6d690b SL |
228 | |
229 | if (r5c_is_writeback(conf->log)) | |
230 | for (i = sh->disks; i--; ) | |
231 | if (test_bit(R5_InJournal, &sh->dev[i].flags)) | |
232 | injournal++; | |
a39f7afd SL |
233 | /* |
234 | * When quiesce in r5c write back, set STRIPE_HANDLE for stripes with | |
235 | * data in journal, so they are not released to cached lists | |
236 | */ | |
237 | if (conf->quiesce && r5c_is_writeback(conf->log) && | |
238 | !test_bit(STRIPE_HANDLE, &sh->state) && injournal != 0) { | |
239 | if (test_bit(STRIPE_R5C_CACHING, &sh->state)) | |
240 | r5c_make_stripe_write_out(sh); | |
241 | set_bit(STRIPE_HANDLE, &sh->state); | |
242 | } | |
1e6d690b | 243 | |
4eb788df SL |
244 | if (test_bit(STRIPE_HANDLE, &sh->state)) { |
245 | if (test_bit(STRIPE_DELAYED, &sh->state) && | |
ad3ab8b6 | 246 | !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) |
4eb788df | 247 | list_add_tail(&sh->lru, &conf->delayed_list); |
ad3ab8b6 | 248 | else if (test_bit(STRIPE_BIT_DELAY, &sh->state) && |
4eb788df SL |
249 | sh->bm_seq - conf->seq_write > 0) |
250 | list_add_tail(&sh->lru, &conf->bitmap_list); | |
251 | else { | |
252 | clear_bit(STRIPE_DELAYED, &sh->state); | |
253 | clear_bit(STRIPE_BIT_DELAY, &sh->state); | |
851c30c9 SL |
254 | if (conf->worker_cnt_per_group == 0) { |
255 | list_add_tail(&sh->lru, &conf->handle_list); | |
256 | } else { | |
257 | raid5_wakeup_stripe_thread(sh); | |
258 | return; | |
259 | } | |
4eb788df SL |
260 | } |
261 | md_wakeup_thread(conf->mddev->thread); | |
262 | } else { | |
263 | BUG_ON(stripe_operations_active(sh)); | |
264 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
265 | if (atomic_dec_return(&conf->preread_active_stripes) | |
266 | < IO_THRESHOLD) | |
267 | md_wakeup_thread(conf->mddev->thread); | |
268 | atomic_dec(&conf->active_stripes); | |
1e6d690b SL |
269 | if (!test_bit(STRIPE_EXPANDING, &sh->state)) { |
270 | if (!r5c_is_writeback(conf->log)) | |
271 | list_add_tail(&sh->lru, temp_inactive_list); | |
272 | else { | |
273 | WARN_ON(test_bit(R5_InJournal, &sh->dev[sh->pd_idx].flags)); | |
274 | if (injournal == 0) | |
275 | list_add_tail(&sh->lru, temp_inactive_list); | |
276 | else if (injournal == conf->raid_disks - conf->max_degraded) { | |
277 | /* full stripe */ | |
278 | if (!test_and_set_bit(STRIPE_R5C_FULL_STRIPE, &sh->state)) | |
279 | atomic_inc(&conf->r5c_cached_full_stripes); | |
280 | if (test_and_clear_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state)) | |
281 | atomic_dec(&conf->r5c_cached_partial_stripes); | |
282 | list_add_tail(&sh->lru, &conf->r5c_full_stripe_list); | |
a39f7afd | 283 | r5c_check_cached_full_stripe(conf); |
03b047f4 SL |
284 | } else |
285 | /* | |
286 | * STRIPE_R5C_PARTIAL_STRIPE is set in | |
287 | * r5c_try_caching_write(). No need to | |
288 | * set it again. | |
289 | */ | |
1e6d690b | 290 | list_add_tail(&sh->lru, &conf->r5c_partial_stripe_list); |
1e6d690b SL |
291 | } |
292 | } | |
1da177e4 LT |
293 | } |
294 | } | |
d0dabf7e | 295 | |
566c09c5 SL |
296 | static void __release_stripe(struct r5conf *conf, struct stripe_head *sh, |
297 | struct list_head *temp_inactive_list) | |
4eb788df SL |
298 | { |
299 | if (atomic_dec_and_test(&sh->count)) | |
566c09c5 SL |
300 | do_release_stripe(conf, sh, temp_inactive_list); |
301 | } | |
302 | ||
303 | /* | |
304 | * @hash could be NR_STRIPE_HASH_LOCKS, then we have a list of inactive_list | |
305 | * | |
306 | * Be careful: Only one task can add/delete stripes from temp_inactive_list at | |
307 | * given time. Adding stripes only takes device lock, while deleting stripes | |
308 | * only takes hash lock. | |
309 | */ | |
310 | static void release_inactive_stripe_list(struct r5conf *conf, | |
311 | struct list_head *temp_inactive_list, | |
312 | int hash) | |
313 | { | |
314 | int size; | |
6ab2a4b8 | 315 | bool do_wakeup = false; |
566c09c5 SL |
316 | unsigned long flags; |
317 | ||
318 | if (hash == NR_STRIPE_HASH_LOCKS) { | |
319 | size = NR_STRIPE_HASH_LOCKS; | |
320 | hash = NR_STRIPE_HASH_LOCKS - 1; | |
321 | } else | |
322 | size = 1; | |
323 | while (size) { | |
324 | struct list_head *list = &temp_inactive_list[size - 1]; | |
325 | ||
326 | /* | |
6d036f7d | 327 | * We don't hold any lock here yet, raid5_get_active_stripe() might |
566c09c5 SL |
328 | * remove stripes from the list |
329 | */ | |
330 | if (!list_empty_careful(list)) { | |
331 | spin_lock_irqsave(conf->hash_locks + hash, flags); | |
4bda556a SL |
332 | if (list_empty(conf->inactive_list + hash) && |
333 | !list_empty(list)) | |
334 | atomic_dec(&conf->empty_inactive_list_nr); | |
566c09c5 | 335 | list_splice_tail_init(list, conf->inactive_list + hash); |
6ab2a4b8 | 336 | do_wakeup = true; |
566c09c5 SL |
337 | spin_unlock_irqrestore(conf->hash_locks + hash, flags); |
338 | } | |
339 | size--; | |
340 | hash--; | |
341 | } | |
342 | ||
343 | if (do_wakeup) { | |
6ab2a4b8 | 344 | wake_up(&conf->wait_for_stripe); |
b1b46486 YL |
345 | if (atomic_read(&conf->active_stripes) == 0) |
346 | wake_up(&conf->wait_for_quiescent); | |
566c09c5 SL |
347 | if (conf->retry_read_aligned) |
348 | md_wakeup_thread(conf->mddev->thread); | |
349 | } | |
4eb788df SL |
350 | } |
351 | ||
773ca82f | 352 | /* should hold conf->device_lock already */ |
566c09c5 SL |
353 | static int release_stripe_list(struct r5conf *conf, |
354 | struct list_head *temp_inactive_list) | |
773ca82f SL |
355 | { |
356 | struct stripe_head *sh; | |
357 | int count = 0; | |
358 | struct llist_node *head; | |
359 | ||
360 | head = llist_del_all(&conf->released_stripes); | |
d265d9dc | 361 | head = llist_reverse_order(head); |
773ca82f | 362 | while (head) { |
566c09c5 SL |
363 | int hash; |
364 | ||
773ca82f SL |
365 | sh = llist_entry(head, struct stripe_head, release_list); |
366 | head = llist_next(head); | |
367 | /* sh could be readded after STRIPE_ON_RELEASE_LIST is cleard */ | |
368 | smp_mb(); | |
369 | clear_bit(STRIPE_ON_RELEASE_LIST, &sh->state); | |
370 | /* | |
371 | * Don't worry the bit is set here, because if the bit is set | |
372 | * again, the count is always > 1. This is true for | |
373 | * STRIPE_ON_UNPLUG_LIST bit too. | |
374 | */ | |
566c09c5 SL |
375 | hash = sh->hash_lock_index; |
376 | __release_stripe(conf, sh, &temp_inactive_list[hash]); | |
773ca82f SL |
377 | count++; |
378 | } | |
379 | ||
380 | return count; | |
381 | } | |
382 | ||
6d036f7d | 383 | void raid5_release_stripe(struct stripe_head *sh) |
1da177e4 | 384 | { |
d1688a6d | 385 | struct r5conf *conf = sh->raid_conf; |
1da177e4 | 386 | unsigned long flags; |
566c09c5 SL |
387 | struct list_head list; |
388 | int hash; | |
773ca82f | 389 | bool wakeup; |
16a53ecc | 390 | |
cf170f3f ES |
391 | /* Avoid release_list until the last reference. |
392 | */ | |
393 | if (atomic_add_unless(&sh->count, -1, 1)) | |
394 | return; | |
395 | ||
ad4068de | 396 | if (unlikely(!conf->mddev->thread) || |
397 | test_and_set_bit(STRIPE_ON_RELEASE_LIST, &sh->state)) | |
773ca82f SL |
398 | goto slow_path; |
399 | wakeup = llist_add(&sh->release_list, &conf->released_stripes); | |
400 | if (wakeup) | |
401 | md_wakeup_thread(conf->mddev->thread); | |
402 | return; | |
403 | slow_path: | |
4eb788df | 404 | local_irq_save(flags); |
773ca82f | 405 | /* we are ok here if STRIPE_ON_RELEASE_LIST is set or not */ |
4eb788df | 406 | if (atomic_dec_and_lock(&sh->count, &conf->device_lock)) { |
566c09c5 SL |
407 | INIT_LIST_HEAD(&list); |
408 | hash = sh->hash_lock_index; | |
409 | do_release_stripe(conf, sh, &list); | |
4eb788df | 410 | spin_unlock(&conf->device_lock); |
566c09c5 | 411 | release_inactive_stripe_list(conf, &list, hash); |
4eb788df SL |
412 | } |
413 | local_irq_restore(flags); | |
1da177e4 LT |
414 | } |
415 | ||
fccddba0 | 416 | static inline void remove_hash(struct stripe_head *sh) |
1da177e4 | 417 | { |
45b4233c DW |
418 | pr_debug("remove_hash(), stripe %llu\n", |
419 | (unsigned long long)sh->sector); | |
1da177e4 | 420 | |
fccddba0 | 421 | hlist_del_init(&sh->hash); |
1da177e4 LT |
422 | } |
423 | ||
d1688a6d | 424 | static inline void insert_hash(struct r5conf *conf, struct stripe_head *sh) |
1da177e4 | 425 | { |
fccddba0 | 426 | struct hlist_head *hp = stripe_hash(conf, sh->sector); |
1da177e4 | 427 | |
45b4233c DW |
428 | pr_debug("insert_hash(), stripe %llu\n", |
429 | (unsigned long long)sh->sector); | |
1da177e4 | 430 | |
fccddba0 | 431 | hlist_add_head(&sh->hash, hp); |
1da177e4 LT |
432 | } |
433 | ||
1da177e4 | 434 | /* find an idle stripe, make sure it is unhashed, and return it. */ |
566c09c5 | 435 | static struct stripe_head *get_free_stripe(struct r5conf *conf, int hash) |
1da177e4 LT |
436 | { |
437 | struct stripe_head *sh = NULL; | |
438 | struct list_head *first; | |
439 | ||
566c09c5 | 440 | if (list_empty(conf->inactive_list + hash)) |
1da177e4 | 441 | goto out; |
566c09c5 | 442 | first = (conf->inactive_list + hash)->next; |
1da177e4 LT |
443 | sh = list_entry(first, struct stripe_head, lru); |
444 | list_del_init(first); | |
445 | remove_hash(sh); | |
446 | atomic_inc(&conf->active_stripes); | |
566c09c5 | 447 | BUG_ON(hash != sh->hash_lock_index); |
4bda556a SL |
448 | if (list_empty(conf->inactive_list + hash)) |
449 | atomic_inc(&conf->empty_inactive_list_nr); | |
1da177e4 LT |
450 | out: |
451 | return sh; | |
452 | } | |
453 | ||
e4e11e38 | 454 | static void shrink_buffers(struct stripe_head *sh) |
1da177e4 LT |
455 | { |
456 | struct page *p; | |
457 | int i; | |
e4e11e38 | 458 | int num = sh->raid_conf->pool_size; |
1da177e4 | 459 | |
e4e11e38 | 460 | for (i = 0; i < num ; i++) { |
d592a996 | 461 | WARN_ON(sh->dev[i].page != sh->dev[i].orig_page); |
1da177e4 LT |
462 | p = sh->dev[i].page; |
463 | if (!p) | |
464 | continue; | |
465 | sh->dev[i].page = NULL; | |
2d1f3b5d | 466 | put_page(p); |
1da177e4 LT |
467 | } |
468 | } | |
469 | ||
a9683a79 | 470 | static int grow_buffers(struct stripe_head *sh, gfp_t gfp) |
1da177e4 LT |
471 | { |
472 | int i; | |
e4e11e38 | 473 | int num = sh->raid_conf->pool_size; |
1da177e4 | 474 | |
e4e11e38 | 475 | for (i = 0; i < num; i++) { |
1da177e4 LT |
476 | struct page *page; |
477 | ||
a9683a79 | 478 | if (!(page = alloc_page(gfp))) { |
1da177e4 LT |
479 | return 1; |
480 | } | |
481 | sh->dev[i].page = page; | |
d592a996 | 482 | sh->dev[i].orig_page = page; |
1da177e4 LT |
483 | } |
484 | return 0; | |
485 | } | |
486 | ||
784052ec | 487 | static void raid5_build_block(struct stripe_head *sh, int i, int previous); |
d1688a6d | 488 | static void stripe_set_idx(sector_t stripe, struct r5conf *conf, int previous, |
911d4ee8 | 489 | struct stripe_head *sh); |
1da177e4 | 490 | |
b5663ba4 | 491 | static void init_stripe(struct stripe_head *sh, sector_t sector, int previous) |
1da177e4 | 492 | { |
d1688a6d | 493 | struct r5conf *conf = sh->raid_conf; |
566c09c5 | 494 | int i, seq; |
1da177e4 | 495 | |
78bafebd ES |
496 | BUG_ON(atomic_read(&sh->count) != 0); |
497 | BUG_ON(test_bit(STRIPE_HANDLE, &sh->state)); | |
600aa109 | 498 | BUG_ON(stripe_operations_active(sh)); |
59fc630b | 499 | BUG_ON(sh->batch_head); |
d84e0f10 | 500 | |
45b4233c | 501 | pr_debug("init_stripe called, stripe %llu\n", |
b8e6a15a | 502 | (unsigned long long)sector); |
566c09c5 SL |
503 | retry: |
504 | seq = read_seqcount_begin(&conf->gen_lock); | |
86b42c71 | 505 | sh->generation = conf->generation - previous; |
b5663ba4 | 506 | sh->disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
1da177e4 | 507 | sh->sector = sector; |
911d4ee8 | 508 | stripe_set_idx(sector, conf, previous, sh); |
1da177e4 LT |
509 | sh->state = 0; |
510 | ||
7ecaa1e6 | 511 | for (i = sh->disks; i--; ) { |
1da177e4 LT |
512 | struct r5dev *dev = &sh->dev[i]; |
513 | ||
d84e0f10 | 514 | if (dev->toread || dev->read || dev->towrite || dev->written || |
1da177e4 | 515 | test_bit(R5_LOCKED, &dev->flags)) { |
cc6167b4 | 516 | pr_err("sector=%llx i=%d %p %p %p %p %d\n", |
1da177e4 | 517 | (unsigned long long)sh->sector, i, dev->toread, |
d84e0f10 | 518 | dev->read, dev->towrite, dev->written, |
1da177e4 | 519 | test_bit(R5_LOCKED, &dev->flags)); |
8cfa7b0f | 520 | WARN_ON(1); |
1da177e4 LT |
521 | } |
522 | dev->flags = 0; | |
784052ec | 523 | raid5_build_block(sh, i, previous); |
1da177e4 | 524 | } |
566c09c5 SL |
525 | if (read_seqcount_retry(&conf->gen_lock, seq)) |
526 | goto retry; | |
7a87f434 | 527 | sh->overwrite_disks = 0; |
1da177e4 | 528 | insert_hash(conf, sh); |
851c30c9 | 529 | sh->cpu = smp_processor_id(); |
da41ba65 | 530 | set_bit(STRIPE_BATCH_READY, &sh->state); |
1da177e4 LT |
531 | } |
532 | ||
d1688a6d | 533 | static struct stripe_head *__find_stripe(struct r5conf *conf, sector_t sector, |
86b42c71 | 534 | short generation) |
1da177e4 LT |
535 | { |
536 | struct stripe_head *sh; | |
537 | ||
45b4233c | 538 | pr_debug("__find_stripe, sector %llu\n", (unsigned long long)sector); |
b67bfe0d | 539 | hlist_for_each_entry(sh, stripe_hash(conf, sector), hash) |
86b42c71 | 540 | if (sh->sector == sector && sh->generation == generation) |
1da177e4 | 541 | return sh; |
45b4233c | 542 | pr_debug("__stripe %llu not in cache\n", (unsigned long long)sector); |
1da177e4 LT |
543 | return NULL; |
544 | } | |
545 | ||
674806d6 N |
546 | /* |
547 | * Need to check if array has failed when deciding whether to: | |
548 | * - start an array | |
549 | * - remove non-faulty devices | |
550 | * - add a spare | |
551 | * - allow a reshape | |
552 | * This determination is simple when no reshape is happening. | |
553 | * However if there is a reshape, we need to carefully check | |
554 | * both the before and after sections. | |
555 | * This is because some failed devices may only affect one | |
556 | * of the two sections, and some non-in_sync devices may | |
557 | * be insync in the section most affected by failed devices. | |
558 | */ | |
2e38a37f | 559 | int raid5_calc_degraded(struct r5conf *conf) |
674806d6 | 560 | { |
908f4fbd | 561 | int degraded, degraded2; |
674806d6 | 562 | int i; |
674806d6 N |
563 | |
564 | rcu_read_lock(); | |
565 | degraded = 0; | |
566 | for (i = 0; i < conf->previous_raid_disks; i++) { | |
3cb03002 | 567 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
e5c86471 N |
568 | if (rdev && test_bit(Faulty, &rdev->flags)) |
569 | rdev = rcu_dereference(conf->disks[i].replacement); | |
674806d6 N |
570 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
571 | degraded++; | |
572 | else if (test_bit(In_sync, &rdev->flags)) | |
573 | ; | |
574 | else | |
575 | /* not in-sync or faulty. | |
576 | * If the reshape increases the number of devices, | |
577 | * this is being recovered by the reshape, so | |
578 | * this 'previous' section is not in_sync. | |
579 | * If the number of devices is being reduced however, | |
580 | * the device can only be part of the array if | |
581 | * we are reverting a reshape, so this section will | |
582 | * be in-sync. | |
583 | */ | |
584 | if (conf->raid_disks >= conf->previous_raid_disks) | |
585 | degraded++; | |
586 | } | |
587 | rcu_read_unlock(); | |
908f4fbd N |
588 | if (conf->raid_disks == conf->previous_raid_disks) |
589 | return degraded; | |
674806d6 | 590 | rcu_read_lock(); |
908f4fbd | 591 | degraded2 = 0; |
674806d6 | 592 | for (i = 0; i < conf->raid_disks; i++) { |
3cb03002 | 593 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
e5c86471 N |
594 | if (rdev && test_bit(Faulty, &rdev->flags)) |
595 | rdev = rcu_dereference(conf->disks[i].replacement); | |
674806d6 | 596 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
908f4fbd | 597 | degraded2++; |
674806d6 N |
598 | else if (test_bit(In_sync, &rdev->flags)) |
599 | ; | |
600 | else | |
601 | /* not in-sync or faulty. | |
602 | * If reshape increases the number of devices, this | |
603 | * section has already been recovered, else it | |
604 | * almost certainly hasn't. | |
605 | */ | |
606 | if (conf->raid_disks <= conf->previous_raid_disks) | |
908f4fbd | 607 | degraded2++; |
674806d6 N |
608 | } |
609 | rcu_read_unlock(); | |
908f4fbd N |
610 | if (degraded2 > degraded) |
611 | return degraded2; | |
612 | return degraded; | |
613 | } | |
614 | ||
615 | static int has_failed(struct r5conf *conf) | |
616 | { | |
617 | int degraded; | |
618 | ||
619 | if (conf->mddev->reshape_position == MaxSector) | |
620 | return conf->mddev->degraded > conf->max_degraded; | |
621 | ||
2e38a37f | 622 | degraded = raid5_calc_degraded(conf); |
674806d6 N |
623 | if (degraded > conf->max_degraded) |
624 | return 1; | |
625 | return 0; | |
626 | } | |
627 | ||
6d036f7d SL |
628 | struct stripe_head * |
629 | raid5_get_active_stripe(struct r5conf *conf, sector_t sector, | |
630 | int previous, int noblock, int noquiesce) | |
1da177e4 LT |
631 | { |
632 | struct stripe_head *sh; | |
566c09c5 | 633 | int hash = stripe_hash_locks_hash(sector); |
ff00d3b4 | 634 | int inc_empty_inactive_list_flag; |
1da177e4 | 635 | |
45b4233c | 636 | pr_debug("get_stripe, sector %llu\n", (unsigned long long)sector); |
1da177e4 | 637 | |
566c09c5 | 638 | spin_lock_irq(conf->hash_locks + hash); |
1da177e4 LT |
639 | |
640 | do { | |
b1b46486 | 641 | wait_event_lock_irq(conf->wait_for_quiescent, |
a8c906ca | 642 | conf->quiesce == 0 || noquiesce, |
566c09c5 | 643 | *(conf->hash_locks + hash)); |
86b42c71 | 644 | sh = __find_stripe(conf, sector, conf->generation - previous); |
1da177e4 | 645 | if (!sh) { |
edbe83ab | 646 | if (!test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state)) { |
566c09c5 | 647 | sh = get_free_stripe(conf, hash); |
713bc5c2 SL |
648 | if (!sh && !test_bit(R5_DID_ALLOC, |
649 | &conf->cache_state)) | |
edbe83ab N |
650 | set_bit(R5_ALLOC_MORE, |
651 | &conf->cache_state); | |
652 | } | |
1da177e4 LT |
653 | if (noblock && sh == NULL) |
654 | break; | |
a39f7afd SL |
655 | |
656 | r5c_check_stripe_cache_usage(conf); | |
1da177e4 | 657 | if (!sh) { |
5423399a N |
658 | set_bit(R5_INACTIVE_BLOCKED, |
659 | &conf->cache_state); | |
a39f7afd | 660 | r5l_wake_reclaim(conf->log, 0); |
6ab2a4b8 SL |
661 | wait_event_lock_irq( |
662 | conf->wait_for_stripe, | |
566c09c5 SL |
663 | !list_empty(conf->inactive_list + hash) && |
664 | (atomic_read(&conf->active_stripes) | |
665 | < (conf->max_nr_stripes * 3 / 4) | |
5423399a N |
666 | || !test_bit(R5_INACTIVE_BLOCKED, |
667 | &conf->cache_state)), | |
6ab2a4b8 | 668 | *(conf->hash_locks + hash)); |
5423399a N |
669 | clear_bit(R5_INACTIVE_BLOCKED, |
670 | &conf->cache_state); | |
7da9d450 | 671 | } else { |
b5663ba4 | 672 | init_stripe(sh, sector, previous); |
7da9d450 N |
673 | atomic_inc(&sh->count); |
674 | } | |
e240c183 | 675 | } else if (!atomic_inc_not_zero(&sh->count)) { |
6d183de4 | 676 | spin_lock(&conf->device_lock); |
e240c183 | 677 | if (!atomic_read(&sh->count)) { |
1da177e4 LT |
678 | if (!test_bit(STRIPE_HANDLE, &sh->state)) |
679 | atomic_inc(&conf->active_stripes); | |
5af9bef7 N |
680 | BUG_ON(list_empty(&sh->lru) && |
681 | !test_bit(STRIPE_EXPANDING, &sh->state)); | |
ff00d3b4 ZL |
682 | inc_empty_inactive_list_flag = 0; |
683 | if (!list_empty(conf->inactive_list + hash)) | |
684 | inc_empty_inactive_list_flag = 1; | |
16a53ecc | 685 | list_del_init(&sh->lru); |
ff00d3b4 ZL |
686 | if (list_empty(conf->inactive_list + hash) && inc_empty_inactive_list_flag) |
687 | atomic_inc(&conf->empty_inactive_list_nr); | |
bfc90cb0 SL |
688 | if (sh->group) { |
689 | sh->group->stripes_cnt--; | |
690 | sh->group = NULL; | |
691 | } | |
1da177e4 | 692 | } |
7da9d450 | 693 | atomic_inc(&sh->count); |
6d183de4 | 694 | spin_unlock(&conf->device_lock); |
1da177e4 LT |
695 | } |
696 | } while (sh == NULL); | |
697 | ||
566c09c5 | 698 | spin_unlock_irq(conf->hash_locks + hash); |
1da177e4 LT |
699 | return sh; |
700 | } | |
701 | ||
7a87f434 | 702 | static bool is_full_stripe_write(struct stripe_head *sh) |
703 | { | |
704 | BUG_ON(sh->overwrite_disks > (sh->disks - sh->raid_conf->max_degraded)); | |
705 | return sh->overwrite_disks == (sh->disks - sh->raid_conf->max_degraded); | |
706 | } | |
707 | ||
59fc630b | 708 | static void lock_two_stripes(struct stripe_head *sh1, struct stripe_head *sh2) |
709 | { | |
710 | local_irq_disable(); | |
711 | if (sh1 > sh2) { | |
712 | spin_lock(&sh2->stripe_lock); | |
713 | spin_lock_nested(&sh1->stripe_lock, 1); | |
714 | } else { | |
715 | spin_lock(&sh1->stripe_lock); | |
716 | spin_lock_nested(&sh2->stripe_lock, 1); | |
717 | } | |
718 | } | |
719 | ||
720 | static void unlock_two_stripes(struct stripe_head *sh1, struct stripe_head *sh2) | |
721 | { | |
722 | spin_unlock(&sh1->stripe_lock); | |
723 | spin_unlock(&sh2->stripe_lock); | |
724 | local_irq_enable(); | |
725 | } | |
726 | ||
727 | /* Only freshly new full stripe normal write stripe can be added to a batch list */ | |
728 | static bool stripe_can_batch(struct stripe_head *sh) | |
729 | { | |
9c3e333d SL |
730 | struct r5conf *conf = sh->raid_conf; |
731 | ||
732 | if (conf->log) | |
733 | return false; | |
59fc630b | 734 | return test_bit(STRIPE_BATCH_READY, &sh->state) && |
d0852df5 | 735 | !test_bit(STRIPE_BITMAP_PENDING, &sh->state) && |
59fc630b | 736 | is_full_stripe_write(sh); |
737 | } | |
738 | ||
739 | /* we only do back search */ | |
740 | static void stripe_add_to_batch_list(struct r5conf *conf, struct stripe_head *sh) | |
741 | { | |
742 | struct stripe_head *head; | |
743 | sector_t head_sector, tmp_sec; | |
744 | int hash; | |
745 | int dd_idx; | |
ff00d3b4 | 746 | int inc_empty_inactive_list_flag; |
59fc630b | 747 | |
59fc630b | 748 | /* Don't cross chunks, so stripe pd_idx/qd_idx is the same */ |
749 | tmp_sec = sh->sector; | |
750 | if (!sector_div(tmp_sec, conf->chunk_sectors)) | |
751 | return; | |
752 | head_sector = sh->sector - STRIPE_SECTORS; | |
753 | ||
754 | hash = stripe_hash_locks_hash(head_sector); | |
755 | spin_lock_irq(conf->hash_locks + hash); | |
756 | head = __find_stripe(conf, head_sector, conf->generation); | |
757 | if (head && !atomic_inc_not_zero(&head->count)) { | |
758 | spin_lock(&conf->device_lock); | |
759 | if (!atomic_read(&head->count)) { | |
760 | if (!test_bit(STRIPE_HANDLE, &head->state)) | |
761 | atomic_inc(&conf->active_stripes); | |
762 | BUG_ON(list_empty(&head->lru) && | |
763 | !test_bit(STRIPE_EXPANDING, &head->state)); | |
ff00d3b4 ZL |
764 | inc_empty_inactive_list_flag = 0; |
765 | if (!list_empty(conf->inactive_list + hash)) | |
766 | inc_empty_inactive_list_flag = 1; | |
59fc630b | 767 | list_del_init(&head->lru); |
ff00d3b4 ZL |
768 | if (list_empty(conf->inactive_list + hash) && inc_empty_inactive_list_flag) |
769 | atomic_inc(&conf->empty_inactive_list_nr); | |
59fc630b | 770 | if (head->group) { |
771 | head->group->stripes_cnt--; | |
772 | head->group = NULL; | |
773 | } | |
774 | } | |
775 | atomic_inc(&head->count); | |
776 | spin_unlock(&conf->device_lock); | |
777 | } | |
778 | spin_unlock_irq(conf->hash_locks + hash); | |
779 | ||
780 | if (!head) | |
781 | return; | |
782 | if (!stripe_can_batch(head)) | |
783 | goto out; | |
784 | ||
785 | lock_two_stripes(head, sh); | |
786 | /* clear_batch_ready clear the flag */ | |
787 | if (!stripe_can_batch(head) || !stripe_can_batch(sh)) | |
788 | goto unlock_out; | |
789 | ||
790 | if (sh->batch_head) | |
791 | goto unlock_out; | |
792 | ||
793 | dd_idx = 0; | |
794 | while (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx) | |
795 | dd_idx++; | |
1eff9d32 | 796 | if (head->dev[dd_idx].towrite->bi_opf != sh->dev[dd_idx].towrite->bi_opf || |
796a5cf0 | 797 | bio_op(head->dev[dd_idx].towrite) != bio_op(sh->dev[dd_idx].towrite)) |
59fc630b | 798 | goto unlock_out; |
799 | ||
800 | if (head->batch_head) { | |
801 | spin_lock(&head->batch_head->batch_lock); | |
802 | /* This batch list is already running */ | |
803 | if (!stripe_can_batch(head)) { | |
804 | spin_unlock(&head->batch_head->batch_lock); | |
805 | goto unlock_out; | |
806 | } | |
807 | ||
808 | /* | |
809 | * at this point, head's BATCH_READY could be cleared, but we | |
810 | * can still add the stripe to batch list | |
811 | */ | |
812 | list_add(&sh->batch_list, &head->batch_list); | |
813 | spin_unlock(&head->batch_head->batch_lock); | |
814 | ||
815 | sh->batch_head = head->batch_head; | |
816 | } else { | |
817 | head->batch_head = head; | |
818 | sh->batch_head = head->batch_head; | |
819 | spin_lock(&head->batch_lock); | |
820 | list_add_tail(&sh->batch_list, &head->batch_list); | |
821 | spin_unlock(&head->batch_lock); | |
822 | } | |
823 | ||
824 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
825 | if (atomic_dec_return(&conf->preread_active_stripes) | |
826 | < IO_THRESHOLD) | |
827 | md_wakeup_thread(conf->mddev->thread); | |
828 | ||
2b6b2457 N |
829 | if (test_and_clear_bit(STRIPE_BIT_DELAY, &sh->state)) { |
830 | int seq = sh->bm_seq; | |
831 | if (test_bit(STRIPE_BIT_DELAY, &sh->batch_head->state) && | |
832 | sh->batch_head->bm_seq > seq) | |
833 | seq = sh->batch_head->bm_seq; | |
834 | set_bit(STRIPE_BIT_DELAY, &sh->batch_head->state); | |
835 | sh->batch_head->bm_seq = seq; | |
836 | } | |
837 | ||
59fc630b | 838 | atomic_inc(&sh->count); |
839 | unlock_out: | |
840 | unlock_two_stripes(head, sh); | |
841 | out: | |
6d036f7d | 842 | raid5_release_stripe(head); |
59fc630b | 843 | } |
844 | ||
05616be5 N |
845 | /* Determine if 'data_offset' or 'new_data_offset' should be used |
846 | * in this stripe_head. | |
847 | */ | |
848 | static int use_new_offset(struct r5conf *conf, struct stripe_head *sh) | |
849 | { | |
850 | sector_t progress = conf->reshape_progress; | |
851 | /* Need a memory barrier to make sure we see the value | |
852 | * of conf->generation, or ->data_offset that was set before | |
853 | * reshape_progress was updated. | |
854 | */ | |
855 | smp_rmb(); | |
856 | if (progress == MaxSector) | |
857 | return 0; | |
858 | if (sh->generation == conf->generation - 1) | |
859 | return 0; | |
860 | /* We are in a reshape, and this is a new-generation stripe, | |
861 | * so use new_data_offset. | |
862 | */ | |
863 | return 1; | |
864 | } | |
865 | ||
765d704d SL |
866 | static void flush_deferred_bios(struct r5conf *conf) |
867 | { | |
868 | struct bio_list tmp; | |
869 | struct bio *bio; | |
870 | ||
871 | if (!conf->batch_bio_dispatch || !conf->group_cnt) | |
872 | return; | |
873 | ||
874 | bio_list_init(&tmp); | |
875 | spin_lock(&conf->pending_bios_lock); | |
876 | bio_list_merge(&tmp, &conf->pending_bios); | |
877 | bio_list_init(&conf->pending_bios); | |
878 | spin_unlock(&conf->pending_bios_lock); | |
879 | ||
880 | while ((bio = bio_list_pop(&tmp))) | |
881 | generic_make_request(bio); | |
882 | } | |
883 | ||
884 | static void defer_bio_issue(struct r5conf *conf, struct bio *bio) | |
885 | { | |
886 | /* | |
887 | * change group_cnt will drain all bios, so this is safe | |
888 | * | |
889 | * A read generally means a read-modify-write, which usually means a | |
890 | * randwrite, so we don't delay it | |
891 | */ | |
892 | if (!conf->batch_bio_dispatch || !conf->group_cnt || | |
893 | bio_op(bio) == REQ_OP_READ) { | |
894 | generic_make_request(bio); | |
895 | return; | |
896 | } | |
897 | spin_lock(&conf->pending_bios_lock); | |
898 | bio_list_add(&conf->pending_bios, bio); | |
899 | spin_unlock(&conf->pending_bios_lock); | |
900 | md_wakeup_thread(conf->mddev->thread); | |
901 | } | |
902 | ||
6712ecf8 | 903 | static void |
4246a0b6 | 904 | raid5_end_read_request(struct bio *bi); |
6712ecf8 | 905 | static void |
4246a0b6 | 906 | raid5_end_write_request(struct bio *bi); |
91c00924 | 907 | |
c4e5ac0a | 908 | static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s) |
91c00924 | 909 | { |
d1688a6d | 910 | struct r5conf *conf = sh->raid_conf; |
91c00924 | 911 | int i, disks = sh->disks; |
59fc630b | 912 | struct stripe_head *head_sh = sh; |
91c00924 DW |
913 | |
914 | might_sleep(); | |
915 | ||
1e6d690b SL |
916 | if (!test_bit(STRIPE_R5C_CACHING, &sh->state)) { |
917 | /* writing out phase */ | |
d7bd398e SL |
918 | if (s->waiting_extra_page) |
919 | return; | |
1e6d690b SL |
920 | if (r5l_write_stripe(conf->log, sh) == 0) |
921 | return; | |
922 | } else { /* caching phase */ | |
923 | if (test_bit(STRIPE_LOG_TRAPPED, &sh->state)) { | |
924 | r5c_cache_data(conf->log, sh, s); | |
925 | return; | |
926 | } | |
927 | } | |
928 | ||
91c00924 | 929 | for (i = disks; i--; ) { |
796a5cf0 | 930 | int op, op_flags = 0; |
9a3e1101 | 931 | int replace_only = 0; |
977df362 N |
932 | struct bio *bi, *rbi; |
933 | struct md_rdev *rdev, *rrdev = NULL; | |
59fc630b | 934 | |
935 | sh = head_sh; | |
e9c7469b | 936 | if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) { |
796a5cf0 | 937 | op = REQ_OP_WRITE; |
e9c7469b | 938 | if (test_and_clear_bit(R5_WantFUA, &sh->dev[i].flags)) |
70fd7614 | 939 | op_flags = REQ_FUA; |
9e444768 | 940 | if (test_bit(R5_Discard, &sh->dev[i].flags)) |
796a5cf0 | 941 | op = REQ_OP_DISCARD; |
e9c7469b | 942 | } else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags)) |
796a5cf0 | 943 | op = REQ_OP_READ; |
9a3e1101 N |
944 | else if (test_and_clear_bit(R5_WantReplace, |
945 | &sh->dev[i].flags)) { | |
796a5cf0 | 946 | op = REQ_OP_WRITE; |
9a3e1101 N |
947 | replace_only = 1; |
948 | } else | |
91c00924 | 949 | continue; |
bc0934f0 | 950 | if (test_and_clear_bit(R5_SyncIO, &sh->dev[i].flags)) |
796a5cf0 | 951 | op_flags |= REQ_SYNC; |
91c00924 | 952 | |
59fc630b | 953 | again: |
91c00924 | 954 | bi = &sh->dev[i].req; |
977df362 | 955 | rbi = &sh->dev[i].rreq; /* For writing to replacement */ |
91c00924 | 956 | |
91c00924 | 957 | rcu_read_lock(); |
9a3e1101 | 958 | rrdev = rcu_dereference(conf->disks[i].replacement); |
dd054fce N |
959 | smp_mb(); /* Ensure that if rrdev is NULL, rdev won't be */ |
960 | rdev = rcu_dereference(conf->disks[i].rdev); | |
961 | if (!rdev) { | |
962 | rdev = rrdev; | |
963 | rrdev = NULL; | |
964 | } | |
796a5cf0 | 965 | if (op_is_write(op)) { |
9a3e1101 N |
966 | if (replace_only) |
967 | rdev = NULL; | |
dd054fce N |
968 | if (rdev == rrdev) |
969 | /* We raced and saw duplicates */ | |
970 | rrdev = NULL; | |
9a3e1101 | 971 | } else { |
59fc630b | 972 | if (test_bit(R5_ReadRepl, &head_sh->dev[i].flags) && rrdev) |
9a3e1101 N |
973 | rdev = rrdev; |
974 | rrdev = NULL; | |
975 | } | |
977df362 | 976 | |
91c00924 DW |
977 | if (rdev && test_bit(Faulty, &rdev->flags)) |
978 | rdev = NULL; | |
979 | if (rdev) | |
980 | atomic_inc(&rdev->nr_pending); | |
977df362 N |
981 | if (rrdev && test_bit(Faulty, &rrdev->flags)) |
982 | rrdev = NULL; | |
983 | if (rrdev) | |
984 | atomic_inc(&rrdev->nr_pending); | |
91c00924 DW |
985 | rcu_read_unlock(); |
986 | ||
73e92e51 | 987 | /* We have already checked bad blocks for reads. Now |
977df362 N |
988 | * need to check for writes. We never accept write errors |
989 | * on the replacement, so we don't to check rrdev. | |
73e92e51 | 990 | */ |
796a5cf0 | 991 | while (op_is_write(op) && rdev && |
73e92e51 N |
992 | test_bit(WriteErrorSeen, &rdev->flags)) { |
993 | sector_t first_bad; | |
994 | int bad_sectors; | |
995 | int bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
996 | &first_bad, &bad_sectors); | |
997 | if (!bad) | |
998 | break; | |
999 | ||
1000 | if (bad < 0) { | |
1001 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1002 | if (!conf->mddev->external && | |
2953079c | 1003 | conf->mddev->sb_flags) { |
73e92e51 N |
1004 | /* It is very unlikely, but we might |
1005 | * still need to write out the | |
1006 | * bad block log - better give it | |
1007 | * a chance*/ | |
1008 | md_check_recovery(conf->mddev); | |
1009 | } | |
1850753d | 1010 | /* |
1011 | * Because md_wait_for_blocked_rdev | |
1012 | * will dec nr_pending, we must | |
1013 | * increment it first. | |
1014 | */ | |
1015 | atomic_inc(&rdev->nr_pending); | |
73e92e51 N |
1016 | md_wait_for_blocked_rdev(rdev, conf->mddev); |
1017 | } else { | |
1018 | /* Acknowledged bad block - skip the write */ | |
1019 | rdev_dec_pending(rdev, conf->mddev); | |
1020 | rdev = NULL; | |
1021 | } | |
1022 | } | |
1023 | ||
91c00924 | 1024 | if (rdev) { |
9a3e1101 N |
1025 | if (s->syncing || s->expanding || s->expanded |
1026 | || s->replacing) | |
91c00924 DW |
1027 | md_sync_acct(rdev->bdev, STRIPE_SECTORS); |
1028 | ||
2b7497f0 DW |
1029 | set_bit(STRIPE_IO_STARTED, &sh->state); |
1030 | ||
91c00924 | 1031 | bi->bi_bdev = rdev->bdev; |
796a5cf0 MC |
1032 | bio_set_op_attrs(bi, op, op_flags); |
1033 | bi->bi_end_io = op_is_write(op) | |
2f6db2a7 KO |
1034 | ? raid5_end_write_request |
1035 | : raid5_end_read_request; | |
1036 | bi->bi_private = sh; | |
1037 | ||
6296b960 | 1038 | pr_debug("%s: for %llu schedule op %d on disc %d\n", |
e46b272b | 1039 | __func__, (unsigned long long)sh->sector, |
1eff9d32 | 1040 | bi->bi_opf, i); |
91c00924 | 1041 | atomic_inc(&sh->count); |
59fc630b | 1042 | if (sh != head_sh) |
1043 | atomic_inc(&head_sh->count); | |
05616be5 | 1044 | if (use_new_offset(conf, sh)) |
4f024f37 | 1045 | bi->bi_iter.bi_sector = (sh->sector |
05616be5 N |
1046 | + rdev->new_data_offset); |
1047 | else | |
4f024f37 | 1048 | bi->bi_iter.bi_sector = (sh->sector |
05616be5 | 1049 | + rdev->data_offset); |
59fc630b | 1050 | if (test_bit(R5_ReadNoMerge, &head_sh->dev[i].flags)) |
1eff9d32 | 1051 | bi->bi_opf |= REQ_NOMERGE; |
3f9e7c14 | 1052 | |
d592a996 SL |
1053 | if (test_bit(R5_SkipCopy, &sh->dev[i].flags)) |
1054 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
86aa1397 SL |
1055 | |
1056 | if (!op_is_write(op) && | |
1057 | test_bit(R5_InJournal, &sh->dev[i].flags)) | |
1058 | /* | |
1059 | * issuing read for a page in journal, this | |
1060 | * must be preparing for prexor in rmw; read | |
1061 | * the data into orig_page | |
1062 | */ | |
1063 | sh->dev[i].vec.bv_page = sh->dev[i].orig_page; | |
1064 | else | |
1065 | sh->dev[i].vec.bv_page = sh->dev[i].page; | |
4997b72e | 1066 | bi->bi_vcnt = 1; |
91c00924 DW |
1067 | bi->bi_io_vec[0].bv_len = STRIPE_SIZE; |
1068 | bi->bi_io_vec[0].bv_offset = 0; | |
4f024f37 | 1069 | bi->bi_iter.bi_size = STRIPE_SIZE; |
37c61ff3 SL |
1070 | /* |
1071 | * If this is discard request, set bi_vcnt 0. We don't | |
1072 | * want to confuse SCSI because SCSI will replace payload | |
1073 | */ | |
796a5cf0 | 1074 | if (op == REQ_OP_DISCARD) |
37c61ff3 | 1075 | bi->bi_vcnt = 0; |
977df362 N |
1076 | if (rrdev) |
1077 | set_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags); | |
e3620a3a JB |
1078 | |
1079 | if (conf->mddev->gendisk) | |
1080 | trace_block_bio_remap(bdev_get_queue(bi->bi_bdev), | |
1081 | bi, disk_devt(conf->mddev->gendisk), | |
1082 | sh->dev[i].sector); | |
765d704d | 1083 | defer_bio_issue(conf, bi); |
977df362 N |
1084 | } |
1085 | if (rrdev) { | |
9a3e1101 N |
1086 | if (s->syncing || s->expanding || s->expanded |
1087 | || s->replacing) | |
977df362 N |
1088 | md_sync_acct(rrdev->bdev, STRIPE_SECTORS); |
1089 | ||
1090 | set_bit(STRIPE_IO_STARTED, &sh->state); | |
1091 | ||
1092 | rbi->bi_bdev = rrdev->bdev; | |
796a5cf0 MC |
1093 | bio_set_op_attrs(rbi, op, op_flags); |
1094 | BUG_ON(!op_is_write(op)); | |
2f6db2a7 KO |
1095 | rbi->bi_end_io = raid5_end_write_request; |
1096 | rbi->bi_private = sh; | |
1097 | ||
6296b960 | 1098 | pr_debug("%s: for %llu schedule op %d on " |
977df362 N |
1099 | "replacement disc %d\n", |
1100 | __func__, (unsigned long long)sh->sector, | |
1eff9d32 | 1101 | rbi->bi_opf, i); |
977df362 | 1102 | atomic_inc(&sh->count); |
59fc630b | 1103 | if (sh != head_sh) |
1104 | atomic_inc(&head_sh->count); | |
05616be5 | 1105 | if (use_new_offset(conf, sh)) |
4f024f37 | 1106 | rbi->bi_iter.bi_sector = (sh->sector |
05616be5 N |
1107 | + rrdev->new_data_offset); |
1108 | else | |
4f024f37 | 1109 | rbi->bi_iter.bi_sector = (sh->sector |
05616be5 | 1110 | + rrdev->data_offset); |
d592a996 SL |
1111 | if (test_bit(R5_SkipCopy, &sh->dev[i].flags)) |
1112 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
1113 | sh->dev[i].rvec.bv_page = sh->dev[i].page; | |
4997b72e | 1114 | rbi->bi_vcnt = 1; |
977df362 N |
1115 | rbi->bi_io_vec[0].bv_len = STRIPE_SIZE; |
1116 | rbi->bi_io_vec[0].bv_offset = 0; | |
4f024f37 | 1117 | rbi->bi_iter.bi_size = STRIPE_SIZE; |
37c61ff3 SL |
1118 | /* |
1119 | * If this is discard request, set bi_vcnt 0. We don't | |
1120 | * want to confuse SCSI because SCSI will replace payload | |
1121 | */ | |
796a5cf0 | 1122 | if (op == REQ_OP_DISCARD) |
37c61ff3 | 1123 | rbi->bi_vcnt = 0; |
e3620a3a JB |
1124 | if (conf->mddev->gendisk) |
1125 | trace_block_bio_remap(bdev_get_queue(rbi->bi_bdev), | |
1126 | rbi, disk_devt(conf->mddev->gendisk), | |
1127 | sh->dev[i].sector); | |
765d704d | 1128 | defer_bio_issue(conf, rbi); |
977df362 N |
1129 | } |
1130 | if (!rdev && !rrdev) { | |
796a5cf0 | 1131 | if (op_is_write(op)) |
91c00924 | 1132 | set_bit(STRIPE_DEGRADED, &sh->state); |
6296b960 | 1133 | pr_debug("skip op %d on disc %d for sector %llu\n", |
1eff9d32 | 1134 | bi->bi_opf, i, (unsigned long long)sh->sector); |
91c00924 DW |
1135 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
1136 | set_bit(STRIPE_HANDLE, &sh->state); | |
1137 | } | |
59fc630b | 1138 | |
1139 | if (!head_sh->batch_head) | |
1140 | continue; | |
1141 | sh = list_first_entry(&sh->batch_list, struct stripe_head, | |
1142 | batch_list); | |
1143 | if (sh != head_sh) | |
1144 | goto again; | |
91c00924 DW |
1145 | } |
1146 | } | |
1147 | ||
1148 | static struct dma_async_tx_descriptor * | |
d592a996 SL |
1149 | async_copy_data(int frombio, struct bio *bio, struct page **page, |
1150 | sector_t sector, struct dma_async_tx_descriptor *tx, | |
1e6d690b | 1151 | struct stripe_head *sh, int no_skipcopy) |
91c00924 | 1152 | { |
7988613b KO |
1153 | struct bio_vec bvl; |
1154 | struct bvec_iter iter; | |
91c00924 | 1155 | struct page *bio_page; |
91c00924 | 1156 | int page_offset; |
a08abd8c | 1157 | struct async_submit_ctl submit; |
0403e382 | 1158 | enum async_tx_flags flags = 0; |
91c00924 | 1159 | |
4f024f37 KO |
1160 | if (bio->bi_iter.bi_sector >= sector) |
1161 | page_offset = (signed)(bio->bi_iter.bi_sector - sector) * 512; | |
91c00924 | 1162 | else |
4f024f37 | 1163 | page_offset = (signed)(sector - bio->bi_iter.bi_sector) * -512; |
a08abd8c | 1164 | |
0403e382 DW |
1165 | if (frombio) |
1166 | flags |= ASYNC_TX_FENCE; | |
1167 | init_async_submit(&submit, flags, tx, NULL, NULL, NULL); | |
1168 | ||
7988613b KO |
1169 | bio_for_each_segment(bvl, bio, iter) { |
1170 | int len = bvl.bv_len; | |
91c00924 DW |
1171 | int clen; |
1172 | int b_offset = 0; | |
1173 | ||
1174 | if (page_offset < 0) { | |
1175 | b_offset = -page_offset; | |
1176 | page_offset += b_offset; | |
1177 | len -= b_offset; | |
1178 | } | |
1179 | ||
1180 | if (len > 0 && page_offset + len > STRIPE_SIZE) | |
1181 | clen = STRIPE_SIZE - page_offset; | |
1182 | else | |
1183 | clen = len; | |
1184 | ||
1185 | if (clen > 0) { | |
7988613b KO |
1186 | b_offset += bvl.bv_offset; |
1187 | bio_page = bvl.bv_page; | |
d592a996 SL |
1188 | if (frombio) { |
1189 | if (sh->raid_conf->skip_copy && | |
1190 | b_offset == 0 && page_offset == 0 && | |
1e6d690b SL |
1191 | clen == STRIPE_SIZE && |
1192 | !no_skipcopy) | |
d592a996 SL |
1193 | *page = bio_page; |
1194 | else | |
1195 | tx = async_memcpy(*page, bio_page, page_offset, | |
a08abd8c | 1196 | b_offset, clen, &submit); |
d592a996 SL |
1197 | } else |
1198 | tx = async_memcpy(bio_page, *page, b_offset, | |
a08abd8c | 1199 | page_offset, clen, &submit); |
91c00924 | 1200 | } |
a08abd8c DW |
1201 | /* chain the operations */ |
1202 | submit.depend_tx = tx; | |
1203 | ||
91c00924 DW |
1204 | if (clen < len) /* hit end of page */ |
1205 | break; | |
1206 | page_offset += len; | |
1207 | } | |
1208 | ||
1209 | return tx; | |
1210 | } | |
1211 | ||
1212 | static void ops_complete_biofill(void *stripe_head_ref) | |
1213 | { | |
1214 | struct stripe_head *sh = stripe_head_ref; | |
34a6f80e | 1215 | struct bio_list return_bi = BIO_EMPTY_LIST; |
e4d84909 | 1216 | int i; |
91c00924 | 1217 | |
e46b272b | 1218 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1219 | (unsigned long long)sh->sector); |
1220 | ||
1221 | /* clear completed biofills */ | |
1222 | for (i = sh->disks; i--; ) { | |
1223 | struct r5dev *dev = &sh->dev[i]; | |
91c00924 DW |
1224 | |
1225 | /* acknowledge completion of a biofill operation */ | |
e4d84909 DW |
1226 | /* and check if we need to reply to a read request, |
1227 | * new R5_Wantfill requests are held off until | |
83de75cc | 1228 | * !STRIPE_BIOFILL_RUN |
e4d84909 DW |
1229 | */ |
1230 | if (test_and_clear_bit(R5_Wantfill, &dev->flags)) { | |
91c00924 | 1231 | struct bio *rbi, *rbi2; |
91c00924 | 1232 | |
91c00924 DW |
1233 | BUG_ON(!dev->read); |
1234 | rbi = dev->read; | |
1235 | dev->read = NULL; | |
4f024f37 | 1236 | while (rbi && rbi->bi_iter.bi_sector < |
91c00924 DW |
1237 | dev->sector + STRIPE_SECTORS) { |
1238 | rbi2 = r5_next_bio(rbi, dev->sector); | |
34a6f80e N |
1239 | if (!raid5_dec_bi_active_stripes(rbi)) |
1240 | bio_list_add(&return_bi, rbi); | |
91c00924 DW |
1241 | rbi = rbi2; |
1242 | } | |
1243 | } | |
1244 | } | |
83de75cc | 1245 | clear_bit(STRIPE_BIOFILL_RUN, &sh->state); |
91c00924 | 1246 | |
34a6f80e | 1247 | return_io(&return_bi); |
91c00924 | 1248 | |
e4d84909 | 1249 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 1250 | raid5_release_stripe(sh); |
91c00924 DW |
1251 | } |
1252 | ||
1253 | static void ops_run_biofill(struct stripe_head *sh) | |
1254 | { | |
1255 | struct dma_async_tx_descriptor *tx = NULL; | |
a08abd8c | 1256 | struct async_submit_ctl submit; |
91c00924 DW |
1257 | int i; |
1258 | ||
59fc630b | 1259 | BUG_ON(sh->batch_head); |
e46b272b | 1260 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1261 | (unsigned long long)sh->sector); |
1262 | ||
1263 | for (i = sh->disks; i--; ) { | |
1264 | struct r5dev *dev = &sh->dev[i]; | |
1265 | if (test_bit(R5_Wantfill, &dev->flags)) { | |
1266 | struct bio *rbi; | |
b17459c0 | 1267 | spin_lock_irq(&sh->stripe_lock); |
91c00924 DW |
1268 | dev->read = rbi = dev->toread; |
1269 | dev->toread = NULL; | |
b17459c0 | 1270 | spin_unlock_irq(&sh->stripe_lock); |
4f024f37 | 1271 | while (rbi && rbi->bi_iter.bi_sector < |
91c00924 | 1272 | dev->sector + STRIPE_SECTORS) { |
d592a996 | 1273 | tx = async_copy_data(0, rbi, &dev->page, |
1e6d690b | 1274 | dev->sector, tx, sh, 0); |
91c00924 DW |
1275 | rbi = r5_next_bio(rbi, dev->sector); |
1276 | } | |
1277 | } | |
1278 | } | |
1279 | ||
1280 | atomic_inc(&sh->count); | |
a08abd8c DW |
1281 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_biofill, sh, NULL); |
1282 | async_trigger_callback(&submit); | |
91c00924 DW |
1283 | } |
1284 | ||
4e7d2c0a | 1285 | static void mark_target_uptodate(struct stripe_head *sh, int target) |
91c00924 | 1286 | { |
4e7d2c0a | 1287 | struct r5dev *tgt; |
91c00924 | 1288 | |
4e7d2c0a DW |
1289 | if (target < 0) |
1290 | return; | |
91c00924 | 1291 | |
4e7d2c0a | 1292 | tgt = &sh->dev[target]; |
91c00924 DW |
1293 | set_bit(R5_UPTODATE, &tgt->flags); |
1294 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1295 | clear_bit(R5_Wantcompute, &tgt->flags); | |
4e7d2c0a DW |
1296 | } |
1297 | ||
ac6b53b6 | 1298 | static void ops_complete_compute(void *stripe_head_ref) |
91c00924 DW |
1299 | { |
1300 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 1301 | |
e46b272b | 1302 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1303 | (unsigned long long)sh->sector); |
1304 | ||
ac6b53b6 | 1305 | /* mark the computed target(s) as uptodate */ |
4e7d2c0a | 1306 | mark_target_uptodate(sh, sh->ops.target); |
ac6b53b6 | 1307 | mark_target_uptodate(sh, sh->ops.target2); |
4e7d2c0a | 1308 | |
ecc65c9b DW |
1309 | clear_bit(STRIPE_COMPUTE_RUN, &sh->state); |
1310 | if (sh->check_state == check_state_compute_run) | |
1311 | sh->check_state = check_state_compute_result; | |
91c00924 | 1312 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 1313 | raid5_release_stripe(sh); |
91c00924 DW |
1314 | } |
1315 | ||
d6f38f31 DW |
1316 | /* return a pointer to the address conversion region of the scribble buffer */ |
1317 | static addr_conv_t *to_addr_conv(struct stripe_head *sh, | |
46d5b785 | 1318 | struct raid5_percpu *percpu, int i) |
d6f38f31 | 1319 | { |
46d5b785 | 1320 | void *addr; |
1321 | ||
1322 | addr = flex_array_get(percpu->scribble, i); | |
1323 | return addr + sizeof(struct page *) * (sh->disks + 2); | |
1324 | } | |
1325 | ||
1326 | /* return a pointer to the address conversion region of the scribble buffer */ | |
1327 | static struct page **to_addr_page(struct raid5_percpu *percpu, int i) | |
1328 | { | |
1329 | void *addr; | |
1330 | ||
1331 | addr = flex_array_get(percpu->scribble, i); | |
1332 | return addr; | |
d6f38f31 DW |
1333 | } |
1334 | ||
1335 | static struct dma_async_tx_descriptor * | |
1336 | ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu) | |
91c00924 | 1337 | { |
91c00924 | 1338 | int disks = sh->disks; |
46d5b785 | 1339 | struct page **xor_srcs = to_addr_page(percpu, 0); |
91c00924 DW |
1340 | int target = sh->ops.target; |
1341 | struct r5dev *tgt = &sh->dev[target]; | |
1342 | struct page *xor_dest = tgt->page; | |
1343 | int count = 0; | |
1344 | struct dma_async_tx_descriptor *tx; | |
a08abd8c | 1345 | struct async_submit_ctl submit; |
91c00924 DW |
1346 | int i; |
1347 | ||
59fc630b | 1348 | BUG_ON(sh->batch_head); |
1349 | ||
91c00924 | 1350 | pr_debug("%s: stripe %llu block: %d\n", |
e46b272b | 1351 | __func__, (unsigned long long)sh->sector, target); |
91c00924 DW |
1352 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); |
1353 | ||
1354 | for (i = disks; i--; ) | |
1355 | if (i != target) | |
1356 | xor_srcs[count++] = sh->dev[i].page; | |
1357 | ||
1358 | atomic_inc(&sh->count); | |
1359 | ||
0403e382 | 1360 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, NULL, |
46d5b785 | 1361 | ops_complete_compute, sh, to_addr_conv(sh, percpu, 0)); |
91c00924 | 1362 | if (unlikely(count == 1)) |
a08abd8c | 1363 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); |
91c00924 | 1364 | else |
a08abd8c | 1365 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); |
91c00924 | 1366 | |
91c00924 DW |
1367 | return tx; |
1368 | } | |
1369 | ||
ac6b53b6 DW |
1370 | /* set_syndrome_sources - populate source buffers for gen_syndrome |
1371 | * @srcs - (struct page *) array of size sh->disks | |
1372 | * @sh - stripe_head to parse | |
1373 | * | |
1374 | * Populates srcs in proper layout order for the stripe and returns the | |
1375 | * 'count' of sources to be used in a call to async_gen_syndrome. The P | |
1376 | * destination buffer is recorded in srcs[count] and the Q destination | |
1377 | * is recorded in srcs[count+1]]. | |
1378 | */ | |
584acdd4 MS |
1379 | static int set_syndrome_sources(struct page **srcs, |
1380 | struct stripe_head *sh, | |
1381 | int srctype) | |
ac6b53b6 DW |
1382 | { |
1383 | int disks = sh->disks; | |
1384 | int syndrome_disks = sh->ddf_layout ? disks : (disks - 2); | |
1385 | int d0_idx = raid6_d0(sh); | |
1386 | int count; | |
1387 | int i; | |
1388 | ||
1389 | for (i = 0; i < disks; i++) | |
5dd33c9a | 1390 | srcs[i] = NULL; |
ac6b53b6 DW |
1391 | |
1392 | count = 0; | |
1393 | i = d0_idx; | |
1394 | do { | |
1395 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); | |
584acdd4 | 1396 | struct r5dev *dev = &sh->dev[i]; |
ac6b53b6 | 1397 | |
584acdd4 MS |
1398 | if (i == sh->qd_idx || i == sh->pd_idx || |
1399 | (srctype == SYNDROME_SRC_ALL) || | |
1400 | (srctype == SYNDROME_SRC_WANT_DRAIN && | |
1e6d690b SL |
1401 | (test_bit(R5_Wantdrain, &dev->flags) || |
1402 | test_bit(R5_InJournal, &dev->flags))) || | |
584acdd4 | 1403 | (srctype == SYNDROME_SRC_WRITTEN && |
1e6d690b SL |
1404 | dev->written)) { |
1405 | if (test_bit(R5_InJournal, &dev->flags)) | |
1406 | srcs[slot] = sh->dev[i].orig_page; | |
1407 | else | |
1408 | srcs[slot] = sh->dev[i].page; | |
1409 | } | |
ac6b53b6 DW |
1410 | i = raid6_next_disk(i, disks); |
1411 | } while (i != d0_idx); | |
ac6b53b6 | 1412 | |
e4424fee | 1413 | return syndrome_disks; |
ac6b53b6 DW |
1414 | } |
1415 | ||
1416 | static struct dma_async_tx_descriptor * | |
1417 | ops_run_compute6_1(struct stripe_head *sh, struct raid5_percpu *percpu) | |
1418 | { | |
1419 | int disks = sh->disks; | |
46d5b785 | 1420 | struct page **blocks = to_addr_page(percpu, 0); |
ac6b53b6 DW |
1421 | int target; |
1422 | int qd_idx = sh->qd_idx; | |
1423 | struct dma_async_tx_descriptor *tx; | |
1424 | struct async_submit_ctl submit; | |
1425 | struct r5dev *tgt; | |
1426 | struct page *dest; | |
1427 | int i; | |
1428 | int count; | |
1429 | ||
59fc630b | 1430 | BUG_ON(sh->batch_head); |
ac6b53b6 DW |
1431 | if (sh->ops.target < 0) |
1432 | target = sh->ops.target2; | |
1433 | else if (sh->ops.target2 < 0) | |
1434 | target = sh->ops.target; | |
91c00924 | 1435 | else |
ac6b53b6 DW |
1436 | /* we should only have one valid target */ |
1437 | BUG(); | |
1438 | BUG_ON(target < 0); | |
1439 | pr_debug("%s: stripe %llu block: %d\n", | |
1440 | __func__, (unsigned long long)sh->sector, target); | |
1441 | ||
1442 | tgt = &sh->dev[target]; | |
1443 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1444 | dest = tgt->page; | |
1445 | ||
1446 | atomic_inc(&sh->count); | |
1447 | ||
1448 | if (target == qd_idx) { | |
584acdd4 | 1449 | count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_ALL); |
ac6b53b6 DW |
1450 | blocks[count] = NULL; /* regenerating p is not necessary */ |
1451 | BUG_ON(blocks[count+1] != dest); /* q should already be set */ | |
0403e382 DW |
1452 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1453 | ops_complete_compute, sh, | |
46d5b785 | 1454 | to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1455 | tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); |
1456 | } else { | |
1457 | /* Compute any data- or p-drive using XOR */ | |
1458 | count = 0; | |
1459 | for (i = disks; i-- ; ) { | |
1460 | if (i == target || i == qd_idx) | |
1461 | continue; | |
1462 | blocks[count++] = sh->dev[i].page; | |
1463 | } | |
1464 | ||
0403e382 DW |
1465 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, |
1466 | NULL, ops_complete_compute, sh, | |
46d5b785 | 1467 | to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1468 | tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, &submit); |
1469 | } | |
91c00924 | 1470 | |
91c00924 DW |
1471 | return tx; |
1472 | } | |
1473 | ||
ac6b53b6 DW |
1474 | static struct dma_async_tx_descriptor * |
1475 | ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu) | |
1476 | { | |
1477 | int i, count, disks = sh->disks; | |
1478 | int syndrome_disks = sh->ddf_layout ? disks : disks-2; | |
1479 | int d0_idx = raid6_d0(sh); | |
1480 | int faila = -1, failb = -1; | |
1481 | int target = sh->ops.target; | |
1482 | int target2 = sh->ops.target2; | |
1483 | struct r5dev *tgt = &sh->dev[target]; | |
1484 | struct r5dev *tgt2 = &sh->dev[target2]; | |
1485 | struct dma_async_tx_descriptor *tx; | |
46d5b785 | 1486 | struct page **blocks = to_addr_page(percpu, 0); |
ac6b53b6 DW |
1487 | struct async_submit_ctl submit; |
1488 | ||
59fc630b | 1489 | BUG_ON(sh->batch_head); |
ac6b53b6 DW |
1490 | pr_debug("%s: stripe %llu block1: %d block2: %d\n", |
1491 | __func__, (unsigned long long)sh->sector, target, target2); | |
1492 | BUG_ON(target < 0 || target2 < 0); | |
1493 | BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); | |
1494 | BUG_ON(!test_bit(R5_Wantcompute, &tgt2->flags)); | |
1495 | ||
6c910a78 | 1496 | /* we need to open-code set_syndrome_sources to handle the |
ac6b53b6 DW |
1497 | * slot number conversion for 'faila' and 'failb' |
1498 | */ | |
1499 | for (i = 0; i < disks ; i++) | |
5dd33c9a | 1500 | blocks[i] = NULL; |
ac6b53b6 DW |
1501 | count = 0; |
1502 | i = d0_idx; | |
1503 | do { | |
1504 | int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); | |
1505 | ||
1506 | blocks[slot] = sh->dev[i].page; | |
1507 | ||
1508 | if (i == target) | |
1509 | faila = slot; | |
1510 | if (i == target2) | |
1511 | failb = slot; | |
1512 | i = raid6_next_disk(i, disks); | |
1513 | } while (i != d0_idx); | |
ac6b53b6 DW |
1514 | |
1515 | BUG_ON(faila == failb); | |
1516 | if (failb < faila) | |
1517 | swap(faila, failb); | |
1518 | pr_debug("%s: stripe: %llu faila: %d failb: %d\n", | |
1519 | __func__, (unsigned long long)sh->sector, faila, failb); | |
1520 | ||
1521 | atomic_inc(&sh->count); | |
1522 | ||
1523 | if (failb == syndrome_disks+1) { | |
1524 | /* Q disk is one of the missing disks */ | |
1525 | if (faila == syndrome_disks) { | |
1526 | /* Missing P+Q, just recompute */ | |
0403e382 DW |
1527 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1528 | ops_complete_compute, sh, | |
46d5b785 | 1529 | to_addr_conv(sh, percpu, 0)); |
e4424fee | 1530 | return async_gen_syndrome(blocks, 0, syndrome_disks+2, |
ac6b53b6 DW |
1531 | STRIPE_SIZE, &submit); |
1532 | } else { | |
1533 | struct page *dest; | |
1534 | int data_target; | |
1535 | int qd_idx = sh->qd_idx; | |
1536 | ||
1537 | /* Missing D+Q: recompute D from P, then recompute Q */ | |
1538 | if (target == qd_idx) | |
1539 | data_target = target2; | |
1540 | else | |
1541 | data_target = target; | |
1542 | ||
1543 | count = 0; | |
1544 | for (i = disks; i-- ; ) { | |
1545 | if (i == data_target || i == qd_idx) | |
1546 | continue; | |
1547 | blocks[count++] = sh->dev[i].page; | |
1548 | } | |
1549 | dest = sh->dev[data_target].page; | |
0403e382 DW |
1550 | init_async_submit(&submit, |
1551 | ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, | |
1552 | NULL, NULL, NULL, | |
46d5b785 | 1553 | to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1554 | tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, |
1555 | &submit); | |
1556 | ||
584acdd4 | 1557 | count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_ALL); |
0403e382 DW |
1558 | init_async_submit(&submit, ASYNC_TX_FENCE, tx, |
1559 | ops_complete_compute, sh, | |
46d5b785 | 1560 | to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1561 | return async_gen_syndrome(blocks, 0, count+2, |
1562 | STRIPE_SIZE, &submit); | |
1563 | } | |
ac6b53b6 | 1564 | } else { |
6c910a78 DW |
1565 | init_async_submit(&submit, ASYNC_TX_FENCE, NULL, |
1566 | ops_complete_compute, sh, | |
46d5b785 | 1567 | to_addr_conv(sh, percpu, 0)); |
6c910a78 DW |
1568 | if (failb == syndrome_disks) { |
1569 | /* We're missing D+P. */ | |
1570 | return async_raid6_datap_recov(syndrome_disks+2, | |
1571 | STRIPE_SIZE, faila, | |
1572 | blocks, &submit); | |
1573 | } else { | |
1574 | /* We're missing D+D. */ | |
1575 | return async_raid6_2data_recov(syndrome_disks+2, | |
1576 | STRIPE_SIZE, faila, failb, | |
1577 | blocks, &submit); | |
1578 | } | |
ac6b53b6 DW |
1579 | } |
1580 | } | |
1581 | ||
91c00924 DW |
1582 | static void ops_complete_prexor(void *stripe_head_ref) |
1583 | { | |
1584 | struct stripe_head *sh = stripe_head_ref; | |
1585 | ||
e46b272b | 1586 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 | 1587 | (unsigned long long)sh->sector); |
1e6d690b SL |
1588 | |
1589 | if (r5c_is_writeback(sh->raid_conf->log)) | |
1590 | /* | |
1591 | * raid5-cache write back uses orig_page during prexor. | |
1592 | * After prexor, it is time to free orig_page | |
1593 | */ | |
1594 | r5c_release_extra_page(sh); | |
91c00924 DW |
1595 | } |
1596 | ||
1597 | static struct dma_async_tx_descriptor * | |
584acdd4 MS |
1598 | ops_run_prexor5(struct stripe_head *sh, struct raid5_percpu *percpu, |
1599 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 1600 | { |
91c00924 | 1601 | int disks = sh->disks; |
46d5b785 | 1602 | struct page **xor_srcs = to_addr_page(percpu, 0); |
91c00924 | 1603 | int count = 0, pd_idx = sh->pd_idx, i; |
a08abd8c | 1604 | struct async_submit_ctl submit; |
91c00924 DW |
1605 | |
1606 | /* existing parity data subtracted */ | |
1607 | struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; | |
1608 | ||
59fc630b | 1609 | BUG_ON(sh->batch_head); |
e46b272b | 1610 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1611 | (unsigned long long)sh->sector); |
1612 | ||
1613 | for (i = disks; i--; ) { | |
1614 | struct r5dev *dev = &sh->dev[i]; | |
1615 | /* Only process blocks that are known to be uptodate */ | |
1e6d690b SL |
1616 | if (test_bit(R5_InJournal, &dev->flags)) |
1617 | xor_srcs[count++] = dev->orig_page; | |
1618 | else if (test_bit(R5_Wantdrain, &dev->flags)) | |
91c00924 DW |
1619 | xor_srcs[count++] = dev->page; |
1620 | } | |
1621 | ||
0403e382 | 1622 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx, |
46d5b785 | 1623 | ops_complete_prexor, sh, to_addr_conv(sh, percpu, 0)); |
a08abd8c | 1624 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); |
91c00924 DW |
1625 | |
1626 | return tx; | |
1627 | } | |
1628 | ||
584acdd4 MS |
1629 | static struct dma_async_tx_descriptor * |
1630 | ops_run_prexor6(struct stripe_head *sh, struct raid5_percpu *percpu, | |
1631 | struct dma_async_tx_descriptor *tx) | |
1632 | { | |
1633 | struct page **blocks = to_addr_page(percpu, 0); | |
1634 | int count; | |
1635 | struct async_submit_ctl submit; | |
1636 | ||
1637 | pr_debug("%s: stripe %llu\n", __func__, | |
1638 | (unsigned long long)sh->sector); | |
1639 | ||
1640 | count = set_syndrome_sources(blocks, sh, SYNDROME_SRC_WANT_DRAIN); | |
1641 | ||
1642 | init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_PQ_XOR_DST, tx, | |
1643 | ops_complete_prexor, sh, to_addr_conv(sh, percpu, 0)); | |
1644 | tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); | |
1645 | ||
1646 | return tx; | |
1647 | } | |
1648 | ||
91c00924 | 1649 | static struct dma_async_tx_descriptor * |
d8ee0728 | 1650 | ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) |
91c00924 | 1651 | { |
1e6d690b | 1652 | struct r5conf *conf = sh->raid_conf; |
91c00924 | 1653 | int disks = sh->disks; |
d8ee0728 | 1654 | int i; |
59fc630b | 1655 | struct stripe_head *head_sh = sh; |
91c00924 | 1656 | |
e46b272b | 1657 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1658 | (unsigned long long)sh->sector); |
1659 | ||
1660 | for (i = disks; i--; ) { | |
59fc630b | 1661 | struct r5dev *dev; |
91c00924 | 1662 | struct bio *chosen; |
91c00924 | 1663 | |
59fc630b | 1664 | sh = head_sh; |
1665 | if (test_and_clear_bit(R5_Wantdrain, &head_sh->dev[i].flags)) { | |
91c00924 DW |
1666 | struct bio *wbi; |
1667 | ||
59fc630b | 1668 | again: |
1669 | dev = &sh->dev[i]; | |
1e6d690b SL |
1670 | /* |
1671 | * clear R5_InJournal, so when rewriting a page in | |
1672 | * journal, it is not skipped by r5l_log_stripe() | |
1673 | */ | |
1674 | clear_bit(R5_InJournal, &dev->flags); | |
b17459c0 | 1675 | spin_lock_irq(&sh->stripe_lock); |
91c00924 DW |
1676 | chosen = dev->towrite; |
1677 | dev->towrite = NULL; | |
7a87f434 | 1678 | sh->overwrite_disks = 0; |
91c00924 DW |
1679 | BUG_ON(dev->written); |
1680 | wbi = dev->written = chosen; | |
b17459c0 | 1681 | spin_unlock_irq(&sh->stripe_lock); |
d592a996 | 1682 | WARN_ON(dev->page != dev->orig_page); |
91c00924 | 1683 | |
4f024f37 | 1684 | while (wbi && wbi->bi_iter.bi_sector < |
91c00924 | 1685 | dev->sector + STRIPE_SECTORS) { |
1eff9d32 | 1686 | if (wbi->bi_opf & REQ_FUA) |
e9c7469b | 1687 | set_bit(R5_WantFUA, &dev->flags); |
1eff9d32 | 1688 | if (wbi->bi_opf & REQ_SYNC) |
bc0934f0 | 1689 | set_bit(R5_SyncIO, &dev->flags); |
796a5cf0 | 1690 | if (bio_op(wbi) == REQ_OP_DISCARD) |
620125f2 | 1691 | set_bit(R5_Discard, &dev->flags); |
d592a996 SL |
1692 | else { |
1693 | tx = async_copy_data(1, wbi, &dev->page, | |
1e6d690b SL |
1694 | dev->sector, tx, sh, |
1695 | r5c_is_writeback(conf->log)); | |
1696 | if (dev->page != dev->orig_page && | |
1697 | !r5c_is_writeback(conf->log)) { | |
d592a996 SL |
1698 | set_bit(R5_SkipCopy, &dev->flags); |
1699 | clear_bit(R5_UPTODATE, &dev->flags); | |
1700 | clear_bit(R5_OVERWRITE, &dev->flags); | |
1701 | } | |
1702 | } | |
91c00924 DW |
1703 | wbi = r5_next_bio(wbi, dev->sector); |
1704 | } | |
59fc630b | 1705 | |
1706 | if (head_sh->batch_head) { | |
1707 | sh = list_first_entry(&sh->batch_list, | |
1708 | struct stripe_head, | |
1709 | batch_list); | |
1710 | if (sh == head_sh) | |
1711 | continue; | |
1712 | goto again; | |
1713 | } | |
91c00924 DW |
1714 | } |
1715 | } | |
1716 | ||
1717 | return tx; | |
1718 | } | |
1719 | ||
ac6b53b6 | 1720 | static void ops_complete_reconstruct(void *stripe_head_ref) |
91c00924 DW |
1721 | { |
1722 | struct stripe_head *sh = stripe_head_ref; | |
ac6b53b6 DW |
1723 | int disks = sh->disks; |
1724 | int pd_idx = sh->pd_idx; | |
1725 | int qd_idx = sh->qd_idx; | |
1726 | int i; | |
9e444768 | 1727 | bool fua = false, sync = false, discard = false; |
91c00924 | 1728 | |
e46b272b | 1729 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1730 | (unsigned long long)sh->sector); |
1731 | ||
bc0934f0 | 1732 | for (i = disks; i--; ) { |
e9c7469b | 1733 | fua |= test_bit(R5_WantFUA, &sh->dev[i].flags); |
bc0934f0 | 1734 | sync |= test_bit(R5_SyncIO, &sh->dev[i].flags); |
9e444768 | 1735 | discard |= test_bit(R5_Discard, &sh->dev[i].flags); |
bc0934f0 | 1736 | } |
e9c7469b | 1737 | |
91c00924 DW |
1738 | for (i = disks; i--; ) { |
1739 | struct r5dev *dev = &sh->dev[i]; | |
ac6b53b6 | 1740 | |
e9c7469b | 1741 | if (dev->written || i == pd_idx || i == qd_idx) { |
d592a996 | 1742 | if (!discard && !test_bit(R5_SkipCopy, &dev->flags)) |
9e444768 | 1743 | set_bit(R5_UPTODATE, &dev->flags); |
e9c7469b TH |
1744 | if (fua) |
1745 | set_bit(R5_WantFUA, &dev->flags); | |
bc0934f0 SL |
1746 | if (sync) |
1747 | set_bit(R5_SyncIO, &dev->flags); | |
e9c7469b | 1748 | } |
91c00924 DW |
1749 | } |
1750 | ||
d8ee0728 DW |
1751 | if (sh->reconstruct_state == reconstruct_state_drain_run) |
1752 | sh->reconstruct_state = reconstruct_state_drain_result; | |
1753 | else if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) | |
1754 | sh->reconstruct_state = reconstruct_state_prexor_drain_result; | |
1755 | else { | |
1756 | BUG_ON(sh->reconstruct_state != reconstruct_state_run); | |
1757 | sh->reconstruct_state = reconstruct_state_result; | |
1758 | } | |
91c00924 DW |
1759 | |
1760 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 1761 | raid5_release_stripe(sh); |
91c00924 DW |
1762 | } |
1763 | ||
1764 | static void | |
ac6b53b6 DW |
1765 | ops_run_reconstruct5(struct stripe_head *sh, struct raid5_percpu *percpu, |
1766 | struct dma_async_tx_descriptor *tx) | |
91c00924 | 1767 | { |
91c00924 | 1768 | int disks = sh->disks; |
59fc630b | 1769 | struct page **xor_srcs; |
a08abd8c | 1770 | struct async_submit_ctl submit; |
59fc630b | 1771 | int count, pd_idx = sh->pd_idx, i; |
91c00924 | 1772 | struct page *xor_dest; |
d8ee0728 | 1773 | int prexor = 0; |
91c00924 | 1774 | unsigned long flags; |
59fc630b | 1775 | int j = 0; |
1776 | struct stripe_head *head_sh = sh; | |
1777 | int last_stripe; | |
91c00924 | 1778 | |
e46b272b | 1779 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1780 | (unsigned long long)sh->sector); |
1781 | ||
620125f2 SL |
1782 | for (i = 0; i < sh->disks; i++) { |
1783 | if (pd_idx == i) | |
1784 | continue; | |
1785 | if (!test_bit(R5_Discard, &sh->dev[i].flags)) | |
1786 | break; | |
1787 | } | |
1788 | if (i >= sh->disks) { | |
1789 | atomic_inc(&sh->count); | |
620125f2 SL |
1790 | set_bit(R5_Discard, &sh->dev[pd_idx].flags); |
1791 | ops_complete_reconstruct(sh); | |
1792 | return; | |
1793 | } | |
59fc630b | 1794 | again: |
1795 | count = 0; | |
1796 | xor_srcs = to_addr_page(percpu, j); | |
91c00924 DW |
1797 | /* check if prexor is active which means only process blocks |
1798 | * that are part of a read-modify-write (written) | |
1799 | */ | |
59fc630b | 1800 | if (head_sh->reconstruct_state == reconstruct_state_prexor_drain_run) { |
d8ee0728 | 1801 | prexor = 1; |
91c00924 DW |
1802 | xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; |
1803 | for (i = disks; i--; ) { | |
1804 | struct r5dev *dev = &sh->dev[i]; | |
1e6d690b SL |
1805 | if (head_sh->dev[i].written || |
1806 | test_bit(R5_InJournal, &head_sh->dev[i].flags)) | |
91c00924 DW |
1807 | xor_srcs[count++] = dev->page; |
1808 | } | |
1809 | } else { | |
1810 | xor_dest = sh->dev[pd_idx].page; | |
1811 | for (i = disks; i--; ) { | |
1812 | struct r5dev *dev = &sh->dev[i]; | |
1813 | if (i != pd_idx) | |
1814 | xor_srcs[count++] = dev->page; | |
1815 | } | |
1816 | } | |
1817 | ||
91c00924 DW |
1818 | /* 1/ if we prexor'd then the dest is reused as a source |
1819 | * 2/ if we did not prexor then we are redoing the parity | |
1820 | * set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST | |
1821 | * for the synchronous xor case | |
1822 | */ | |
59fc630b | 1823 | last_stripe = !head_sh->batch_head || |
1824 | list_first_entry(&sh->batch_list, | |
1825 | struct stripe_head, batch_list) == head_sh; | |
1826 | if (last_stripe) { | |
1827 | flags = ASYNC_TX_ACK | | |
1828 | (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST); | |
1829 | ||
1830 | atomic_inc(&head_sh->count); | |
1831 | init_async_submit(&submit, flags, tx, ops_complete_reconstruct, head_sh, | |
1832 | to_addr_conv(sh, percpu, j)); | |
1833 | } else { | |
1834 | flags = prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST; | |
1835 | init_async_submit(&submit, flags, tx, NULL, NULL, | |
1836 | to_addr_conv(sh, percpu, j)); | |
1837 | } | |
91c00924 | 1838 | |
a08abd8c DW |
1839 | if (unlikely(count == 1)) |
1840 | tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); | |
1841 | else | |
1842 | tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); | |
59fc630b | 1843 | if (!last_stripe) { |
1844 | j++; | |
1845 | sh = list_first_entry(&sh->batch_list, struct stripe_head, | |
1846 | batch_list); | |
1847 | goto again; | |
1848 | } | |
91c00924 DW |
1849 | } |
1850 | ||
ac6b53b6 DW |
1851 | static void |
1852 | ops_run_reconstruct6(struct stripe_head *sh, struct raid5_percpu *percpu, | |
1853 | struct dma_async_tx_descriptor *tx) | |
1854 | { | |
1855 | struct async_submit_ctl submit; | |
59fc630b | 1856 | struct page **blocks; |
1857 | int count, i, j = 0; | |
1858 | struct stripe_head *head_sh = sh; | |
1859 | int last_stripe; | |
584acdd4 MS |
1860 | int synflags; |
1861 | unsigned long txflags; | |
ac6b53b6 DW |
1862 | |
1863 | pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector); | |
1864 | ||
620125f2 SL |
1865 | for (i = 0; i < sh->disks; i++) { |
1866 | if (sh->pd_idx == i || sh->qd_idx == i) | |
1867 | continue; | |
1868 | if (!test_bit(R5_Discard, &sh->dev[i].flags)) | |
1869 | break; | |
1870 | } | |
1871 | if (i >= sh->disks) { | |
1872 | atomic_inc(&sh->count); | |
620125f2 SL |
1873 | set_bit(R5_Discard, &sh->dev[sh->pd_idx].flags); |
1874 | set_bit(R5_Discard, &sh->dev[sh->qd_idx].flags); | |
1875 | ops_complete_reconstruct(sh); | |
1876 | return; | |
1877 | } | |
1878 | ||
59fc630b | 1879 | again: |
1880 | blocks = to_addr_page(percpu, j); | |
584acdd4 MS |
1881 | |
1882 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_run) { | |
1883 | synflags = SYNDROME_SRC_WRITTEN; | |
1884 | txflags = ASYNC_TX_ACK | ASYNC_TX_PQ_XOR_DST; | |
1885 | } else { | |
1886 | synflags = SYNDROME_SRC_ALL; | |
1887 | txflags = ASYNC_TX_ACK; | |
1888 | } | |
1889 | ||
1890 | count = set_syndrome_sources(blocks, sh, synflags); | |
59fc630b | 1891 | last_stripe = !head_sh->batch_head || |
1892 | list_first_entry(&sh->batch_list, | |
1893 | struct stripe_head, batch_list) == head_sh; | |
1894 | ||
1895 | if (last_stripe) { | |
1896 | atomic_inc(&head_sh->count); | |
584acdd4 | 1897 | init_async_submit(&submit, txflags, tx, ops_complete_reconstruct, |
59fc630b | 1898 | head_sh, to_addr_conv(sh, percpu, j)); |
1899 | } else | |
1900 | init_async_submit(&submit, 0, tx, NULL, NULL, | |
1901 | to_addr_conv(sh, percpu, j)); | |
48769695 | 1902 | tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); |
59fc630b | 1903 | if (!last_stripe) { |
1904 | j++; | |
1905 | sh = list_first_entry(&sh->batch_list, struct stripe_head, | |
1906 | batch_list); | |
1907 | goto again; | |
1908 | } | |
91c00924 DW |
1909 | } |
1910 | ||
1911 | static void ops_complete_check(void *stripe_head_ref) | |
1912 | { | |
1913 | struct stripe_head *sh = stripe_head_ref; | |
91c00924 | 1914 | |
e46b272b | 1915 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1916 | (unsigned long long)sh->sector); |
1917 | ||
ecc65c9b | 1918 | sh->check_state = check_state_check_result; |
91c00924 | 1919 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 1920 | raid5_release_stripe(sh); |
91c00924 DW |
1921 | } |
1922 | ||
ac6b53b6 | 1923 | static void ops_run_check_p(struct stripe_head *sh, struct raid5_percpu *percpu) |
91c00924 | 1924 | { |
91c00924 | 1925 | int disks = sh->disks; |
ac6b53b6 DW |
1926 | int pd_idx = sh->pd_idx; |
1927 | int qd_idx = sh->qd_idx; | |
1928 | struct page *xor_dest; | |
46d5b785 | 1929 | struct page **xor_srcs = to_addr_page(percpu, 0); |
91c00924 | 1930 | struct dma_async_tx_descriptor *tx; |
a08abd8c | 1931 | struct async_submit_ctl submit; |
ac6b53b6 DW |
1932 | int count; |
1933 | int i; | |
91c00924 | 1934 | |
e46b272b | 1935 | pr_debug("%s: stripe %llu\n", __func__, |
91c00924 DW |
1936 | (unsigned long long)sh->sector); |
1937 | ||
59fc630b | 1938 | BUG_ON(sh->batch_head); |
ac6b53b6 DW |
1939 | count = 0; |
1940 | xor_dest = sh->dev[pd_idx].page; | |
1941 | xor_srcs[count++] = xor_dest; | |
91c00924 | 1942 | for (i = disks; i--; ) { |
ac6b53b6 DW |
1943 | if (i == pd_idx || i == qd_idx) |
1944 | continue; | |
1945 | xor_srcs[count++] = sh->dev[i].page; | |
91c00924 DW |
1946 | } |
1947 | ||
d6f38f31 | 1948 | init_async_submit(&submit, 0, NULL, NULL, NULL, |
46d5b785 | 1949 | to_addr_conv(sh, percpu, 0)); |
099f53cb | 1950 | tx = async_xor_val(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, |
a08abd8c | 1951 | &sh->ops.zero_sum_result, &submit); |
91c00924 | 1952 | |
91c00924 | 1953 | atomic_inc(&sh->count); |
a08abd8c DW |
1954 | init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_check, sh, NULL); |
1955 | tx = async_trigger_callback(&submit); | |
91c00924 DW |
1956 | } |
1957 | ||
ac6b53b6 DW |
1958 | static void ops_run_check_pq(struct stripe_head *sh, struct raid5_percpu *percpu, int checkp) |
1959 | { | |
46d5b785 | 1960 | struct page **srcs = to_addr_page(percpu, 0); |
ac6b53b6 DW |
1961 | struct async_submit_ctl submit; |
1962 | int count; | |
1963 | ||
1964 | pr_debug("%s: stripe %llu checkp: %d\n", __func__, | |
1965 | (unsigned long long)sh->sector, checkp); | |
1966 | ||
59fc630b | 1967 | BUG_ON(sh->batch_head); |
584acdd4 | 1968 | count = set_syndrome_sources(srcs, sh, SYNDROME_SRC_ALL); |
ac6b53b6 DW |
1969 | if (!checkp) |
1970 | srcs[count] = NULL; | |
91c00924 | 1971 | |
91c00924 | 1972 | atomic_inc(&sh->count); |
ac6b53b6 | 1973 | init_async_submit(&submit, ASYNC_TX_ACK, NULL, ops_complete_check, |
46d5b785 | 1974 | sh, to_addr_conv(sh, percpu, 0)); |
ac6b53b6 DW |
1975 | async_syndrome_val(srcs, 0, count+2, STRIPE_SIZE, |
1976 | &sh->ops.zero_sum_result, percpu->spare_page, &submit); | |
91c00924 DW |
1977 | } |
1978 | ||
51acbcec | 1979 | static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request) |
91c00924 DW |
1980 | { |
1981 | int overlap_clear = 0, i, disks = sh->disks; | |
1982 | struct dma_async_tx_descriptor *tx = NULL; | |
d1688a6d | 1983 | struct r5conf *conf = sh->raid_conf; |
ac6b53b6 | 1984 | int level = conf->level; |
d6f38f31 DW |
1985 | struct raid5_percpu *percpu; |
1986 | unsigned long cpu; | |
91c00924 | 1987 | |
d6f38f31 DW |
1988 | cpu = get_cpu(); |
1989 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
83de75cc | 1990 | if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) { |
91c00924 DW |
1991 | ops_run_biofill(sh); |
1992 | overlap_clear++; | |
1993 | } | |
1994 | ||
7b3a871e | 1995 | if (test_bit(STRIPE_OP_COMPUTE_BLK, &ops_request)) { |
ac6b53b6 DW |
1996 | if (level < 6) |
1997 | tx = ops_run_compute5(sh, percpu); | |
1998 | else { | |
1999 | if (sh->ops.target2 < 0 || sh->ops.target < 0) | |
2000 | tx = ops_run_compute6_1(sh, percpu); | |
2001 | else | |
2002 | tx = ops_run_compute6_2(sh, percpu); | |
2003 | } | |
2004 | /* terminate the chain if reconstruct is not set to be run */ | |
2005 | if (tx && !test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) | |
7b3a871e DW |
2006 | async_tx_ack(tx); |
2007 | } | |
91c00924 | 2008 | |
584acdd4 MS |
2009 | if (test_bit(STRIPE_OP_PREXOR, &ops_request)) { |
2010 | if (level < 6) | |
2011 | tx = ops_run_prexor5(sh, percpu, tx); | |
2012 | else | |
2013 | tx = ops_run_prexor6(sh, percpu, tx); | |
2014 | } | |
91c00924 | 2015 | |
600aa109 | 2016 | if (test_bit(STRIPE_OP_BIODRAIN, &ops_request)) { |
d8ee0728 | 2017 | tx = ops_run_biodrain(sh, tx); |
91c00924 DW |
2018 | overlap_clear++; |
2019 | } | |
2020 | ||
ac6b53b6 DW |
2021 | if (test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) { |
2022 | if (level < 6) | |
2023 | ops_run_reconstruct5(sh, percpu, tx); | |
2024 | else | |
2025 | ops_run_reconstruct6(sh, percpu, tx); | |
2026 | } | |
91c00924 | 2027 | |
ac6b53b6 DW |
2028 | if (test_bit(STRIPE_OP_CHECK, &ops_request)) { |
2029 | if (sh->check_state == check_state_run) | |
2030 | ops_run_check_p(sh, percpu); | |
2031 | else if (sh->check_state == check_state_run_q) | |
2032 | ops_run_check_pq(sh, percpu, 0); | |
2033 | else if (sh->check_state == check_state_run_pq) | |
2034 | ops_run_check_pq(sh, percpu, 1); | |
2035 | else | |
2036 | BUG(); | |
2037 | } | |
91c00924 | 2038 | |
59fc630b | 2039 | if (overlap_clear && !sh->batch_head) |
91c00924 DW |
2040 | for (i = disks; i--; ) { |
2041 | struct r5dev *dev = &sh->dev[i]; | |
2042 | if (test_and_clear_bit(R5_Overlap, &dev->flags)) | |
2043 | wake_up(&sh->raid_conf->wait_for_overlap); | |
2044 | } | |
d6f38f31 | 2045 | put_cpu(); |
91c00924 DW |
2046 | } |
2047 | ||
5f9d1fde SL |
2048 | static struct stripe_head *alloc_stripe(struct kmem_cache *sc, gfp_t gfp, |
2049 | int disks) | |
f18c1a35 N |
2050 | { |
2051 | struct stripe_head *sh; | |
5f9d1fde | 2052 | int i; |
f18c1a35 N |
2053 | |
2054 | sh = kmem_cache_zalloc(sc, gfp); | |
2055 | if (sh) { | |
2056 | spin_lock_init(&sh->stripe_lock); | |
2057 | spin_lock_init(&sh->batch_lock); | |
2058 | INIT_LIST_HEAD(&sh->batch_list); | |
2059 | INIT_LIST_HEAD(&sh->lru); | |
a39f7afd | 2060 | INIT_LIST_HEAD(&sh->r5c); |
d7bd398e | 2061 | INIT_LIST_HEAD(&sh->log_list); |
f18c1a35 | 2062 | atomic_set(&sh->count, 1); |
a39f7afd | 2063 | sh->log_start = MaxSector; |
5f9d1fde SL |
2064 | for (i = 0; i < disks; i++) { |
2065 | struct r5dev *dev = &sh->dev[i]; | |
2066 | ||
3a83f467 ML |
2067 | bio_init(&dev->req, &dev->vec, 1); |
2068 | bio_init(&dev->rreq, &dev->rvec, 1); | |
5f9d1fde | 2069 | } |
f18c1a35 N |
2070 | } |
2071 | return sh; | |
2072 | } | |
486f0644 | 2073 | static int grow_one_stripe(struct r5conf *conf, gfp_t gfp) |
1da177e4 LT |
2074 | { |
2075 | struct stripe_head *sh; | |
f18c1a35 | 2076 | |
5f9d1fde | 2077 | sh = alloc_stripe(conf->slab_cache, gfp, conf->pool_size); |
3f294f4f N |
2078 | if (!sh) |
2079 | return 0; | |
6ce32846 | 2080 | |
3f294f4f | 2081 | sh->raid_conf = conf; |
3f294f4f | 2082 | |
a9683a79 | 2083 | if (grow_buffers(sh, gfp)) { |
e4e11e38 | 2084 | shrink_buffers(sh); |
3f294f4f N |
2085 | kmem_cache_free(conf->slab_cache, sh); |
2086 | return 0; | |
2087 | } | |
486f0644 N |
2088 | sh->hash_lock_index = |
2089 | conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS; | |
3f294f4f | 2090 | /* we just created an active stripe so... */ |
3f294f4f | 2091 | atomic_inc(&conf->active_stripes); |
59fc630b | 2092 | |
6d036f7d | 2093 | raid5_release_stripe(sh); |
486f0644 | 2094 | conf->max_nr_stripes++; |
3f294f4f N |
2095 | return 1; |
2096 | } | |
2097 | ||
d1688a6d | 2098 | static int grow_stripes(struct r5conf *conf, int num) |
3f294f4f | 2099 | { |
e18b890b | 2100 | struct kmem_cache *sc; |
5e5e3e78 | 2101 | int devs = max(conf->raid_disks, conf->previous_raid_disks); |
1da177e4 | 2102 | |
f4be6b43 N |
2103 | if (conf->mddev->gendisk) |
2104 | sprintf(conf->cache_name[0], | |
2105 | "raid%d-%s", conf->level, mdname(conf->mddev)); | |
2106 | else | |
2107 | sprintf(conf->cache_name[0], | |
2108 | "raid%d-%p", conf->level, conf->mddev); | |
2109 | sprintf(conf->cache_name[1], "%s-alt", conf->cache_name[0]); | |
2110 | ||
ad01c9e3 N |
2111 | conf->active_name = 0; |
2112 | sc = kmem_cache_create(conf->cache_name[conf->active_name], | |
1da177e4 | 2113 | sizeof(struct stripe_head)+(devs-1)*sizeof(struct r5dev), |
20c2df83 | 2114 | 0, 0, NULL); |
1da177e4 LT |
2115 | if (!sc) |
2116 | return 1; | |
2117 | conf->slab_cache = sc; | |
ad01c9e3 | 2118 | conf->pool_size = devs; |
486f0644 N |
2119 | while (num--) |
2120 | if (!grow_one_stripe(conf, GFP_KERNEL)) | |
1da177e4 | 2121 | return 1; |
486f0644 | 2122 | |
1da177e4 LT |
2123 | return 0; |
2124 | } | |
29269553 | 2125 | |
d6f38f31 DW |
2126 | /** |
2127 | * scribble_len - return the required size of the scribble region | |
2128 | * @num - total number of disks in the array | |
2129 | * | |
2130 | * The size must be enough to contain: | |
2131 | * 1/ a struct page pointer for each device in the array +2 | |
2132 | * 2/ room to convert each entry in (1) to its corresponding dma | |
2133 | * (dma_map_page()) or page (page_address()) address. | |
2134 | * | |
2135 | * Note: the +2 is for the destination buffers of the ddf/raid6 case where we | |
2136 | * calculate over all devices (not just the data blocks), using zeros in place | |
2137 | * of the P and Q blocks. | |
2138 | */ | |
46d5b785 | 2139 | static struct flex_array *scribble_alloc(int num, int cnt, gfp_t flags) |
d6f38f31 | 2140 | { |
46d5b785 | 2141 | struct flex_array *ret; |
d6f38f31 DW |
2142 | size_t len; |
2143 | ||
2144 | len = sizeof(struct page *) * (num+2) + sizeof(addr_conv_t) * (num+2); | |
46d5b785 | 2145 | ret = flex_array_alloc(len, cnt, flags); |
2146 | if (!ret) | |
2147 | return NULL; | |
2148 | /* always prealloc all elements, so no locking is required */ | |
2149 | if (flex_array_prealloc(ret, 0, cnt, flags)) { | |
2150 | flex_array_free(ret); | |
2151 | return NULL; | |
2152 | } | |
2153 | return ret; | |
d6f38f31 DW |
2154 | } |
2155 | ||
738a2738 N |
2156 | static int resize_chunks(struct r5conf *conf, int new_disks, int new_sectors) |
2157 | { | |
2158 | unsigned long cpu; | |
2159 | int err = 0; | |
2160 | ||
27a353c0 SL |
2161 | /* |
2162 | * Never shrink. And mddev_suspend() could deadlock if this is called | |
2163 | * from raid5d. In that case, scribble_disks and scribble_sectors | |
2164 | * should equal to new_disks and new_sectors | |
2165 | */ | |
2166 | if (conf->scribble_disks >= new_disks && | |
2167 | conf->scribble_sectors >= new_sectors) | |
2168 | return 0; | |
738a2738 N |
2169 | mddev_suspend(conf->mddev); |
2170 | get_online_cpus(); | |
2171 | for_each_present_cpu(cpu) { | |
2172 | struct raid5_percpu *percpu; | |
2173 | struct flex_array *scribble; | |
2174 | ||
2175 | percpu = per_cpu_ptr(conf->percpu, cpu); | |
2176 | scribble = scribble_alloc(new_disks, | |
2177 | new_sectors / STRIPE_SECTORS, | |
2178 | GFP_NOIO); | |
2179 | ||
2180 | if (scribble) { | |
2181 | flex_array_free(percpu->scribble); | |
2182 | percpu->scribble = scribble; | |
2183 | } else { | |
2184 | err = -ENOMEM; | |
2185 | break; | |
2186 | } | |
2187 | } | |
2188 | put_online_cpus(); | |
2189 | mddev_resume(conf->mddev); | |
27a353c0 SL |
2190 | if (!err) { |
2191 | conf->scribble_disks = new_disks; | |
2192 | conf->scribble_sectors = new_sectors; | |
2193 | } | |
738a2738 N |
2194 | return err; |
2195 | } | |
2196 | ||
d1688a6d | 2197 | static int resize_stripes(struct r5conf *conf, int newsize) |
ad01c9e3 N |
2198 | { |
2199 | /* Make all the stripes able to hold 'newsize' devices. | |
2200 | * New slots in each stripe get 'page' set to a new page. | |
2201 | * | |
2202 | * This happens in stages: | |
2203 | * 1/ create a new kmem_cache and allocate the required number of | |
2204 | * stripe_heads. | |
83f0d77a | 2205 | * 2/ gather all the old stripe_heads and transfer the pages across |
ad01c9e3 N |
2206 | * to the new stripe_heads. This will have the side effect of |
2207 | * freezing the array as once all stripe_heads have been collected, | |
2208 | * no IO will be possible. Old stripe heads are freed once their | |
2209 | * pages have been transferred over, and the old kmem_cache is | |
2210 | * freed when all stripes are done. | |
2211 | * 3/ reallocate conf->disks to be suitable bigger. If this fails, | |
2212 | * we simple return a failre status - no need to clean anything up. | |
2213 | * 4/ allocate new pages for the new slots in the new stripe_heads. | |
2214 | * If this fails, we don't bother trying the shrink the | |
2215 | * stripe_heads down again, we just leave them as they are. | |
2216 | * As each stripe_head is processed the new one is released into | |
2217 | * active service. | |
2218 | * | |
2219 | * Once step2 is started, we cannot afford to wait for a write, | |
2220 | * so we use GFP_NOIO allocations. | |
2221 | */ | |
2222 | struct stripe_head *osh, *nsh; | |
2223 | LIST_HEAD(newstripes); | |
2224 | struct disk_info *ndisks; | |
b5470dc5 | 2225 | int err; |
e18b890b | 2226 | struct kmem_cache *sc; |
ad01c9e3 | 2227 | int i; |
566c09c5 | 2228 | int hash, cnt; |
ad01c9e3 N |
2229 | |
2230 | if (newsize <= conf->pool_size) | |
2231 | return 0; /* never bother to shrink */ | |
2232 | ||
b5470dc5 DW |
2233 | err = md_allow_write(conf->mddev); |
2234 | if (err) | |
2235 | return err; | |
2a2275d6 | 2236 | |
ad01c9e3 N |
2237 | /* Step 1 */ |
2238 | sc = kmem_cache_create(conf->cache_name[1-conf->active_name], | |
2239 | sizeof(struct stripe_head)+(newsize-1)*sizeof(struct r5dev), | |
20c2df83 | 2240 | 0, 0, NULL); |
ad01c9e3 N |
2241 | if (!sc) |
2242 | return -ENOMEM; | |
2243 | ||
2d5b569b N |
2244 | /* Need to ensure auto-resizing doesn't interfere */ |
2245 | mutex_lock(&conf->cache_size_mutex); | |
2246 | ||
ad01c9e3 | 2247 | for (i = conf->max_nr_stripes; i; i--) { |
5f9d1fde | 2248 | nsh = alloc_stripe(sc, GFP_KERNEL, newsize); |
ad01c9e3 N |
2249 | if (!nsh) |
2250 | break; | |
2251 | ||
ad01c9e3 | 2252 | nsh->raid_conf = conf; |
ad01c9e3 N |
2253 | list_add(&nsh->lru, &newstripes); |
2254 | } | |
2255 | if (i) { | |
2256 | /* didn't get enough, give up */ | |
2257 | while (!list_empty(&newstripes)) { | |
2258 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
2259 | list_del(&nsh->lru); | |
2260 | kmem_cache_free(sc, nsh); | |
2261 | } | |
2262 | kmem_cache_destroy(sc); | |
2d5b569b | 2263 | mutex_unlock(&conf->cache_size_mutex); |
ad01c9e3 N |
2264 | return -ENOMEM; |
2265 | } | |
2266 | /* Step 2 - Must use GFP_NOIO now. | |
2267 | * OK, we have enough stripes, start collecting inactive | |
2268 | * stripes and copying them over | |
2269 | */ | |
566c09c5 SL |
2270 | hash = 0; |
2271 | cnt = 0; | |
ad01c9e3 | 2272 | list_for_each_entry(nsh, &newstripes, lru) { |
566c09c5 | 2273 | lock_device_hash_lock(conf, hash); |
6ab2a4b8 | 2274 | wait_event_cmd(conf->wait_for_stripe, |
566c09c5 SL |
2275 | !list_empty(conf->inactive_list + hash), |
2276 | unlock_device_hash_lock(conf, hash), | |
2277 | lock_device_hash_lock(conf, hash)); | |
2278 | osh = get_free_stripe(conf, hash); | |
2279 | unlock_device_hash_lock(conf, hash); | |
f18c1a35 | 2280 | |
d592a996 | 2281 | for(i=0; i<conf->pool_size; i++) { |
ad01c9e3 | 2282 | nsh->dev[i].page = osh->dev[i].page; |
d592a996 SL |
2283 | nsh->dev[i].orig_page = osh->dev[i].page; |
2284 | } | |
566c09c5 | 2285 | nsh->hash_lock_index = hash; |
ad01c9e3 | 2286 | kmem_cache_free(conf->slab_cache, osh); |
566c09c5 SL |
2287 | cnt++; |
2288 | if (cnt >= conf->max_nr_stripes / NR_STRIPE_HASH_LOCKS + | |
2289 | !!((conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS) > hash)) { | |
2290 | hash++; | |
2291 | cnt = 0; | |
2292 | } | |
ad01c9e3 N |
2293 | } |
2294 | kmem_cache_destroy(conf->slab_cache); | |
2295 | ||
2296 | /* Step 3. | |
2297 | * At this point, we are holding all the stripes so the array | |
2298 | * is completely stalled, so now is a good time to resize | |
d6f38f31 | 2299 | * conf->disks and the scribble region |
ad01c9e3 N |
2300 | */ |
2301 | ndisks = kzalloc(newsize * sizeof(struct disk_info), GFP_NOIO); | |
2302 | if (ndisks) { | |
d7bd398e | 2303 | for (i = 0; i < conf->pool_size; i++) |
ad01c9e3 | 2304 | ndisks[i] = conf->disks[i]; |
d7bd398e SL |
2305 | |
2306 | for (i = conf->pool_size; i < newsize; i++) { | |
2307 | ndisks[i].extra_page = alloc_page(GFP_NOIO); | |
2308 | if (!ndisks[i].extra_page) | |
2309 | err = -ENOMEM; | |
2310 | } | |
2311 | ||
2312 | if (err) { | |
2313 | for (i = conf->pool_size; i < newsize; i++) | |
2314 | if (ndisks[i].extra_page) | |
2315 | put_page(ndisks[i].extra_page); | |
2316 | kfree(ndisks); | |
2317 | } else { | |
2318 | kfree(conf->disks); | |
2319 | conf->disks = ndisks; | |
2320 | } | |
ad01c9e3 N |
2321 | } else |
2322 | err = -ENOMEM; | |
2323 | ||
2d5b569b | 2324 | mutex_unlock(&conf->cache_size_mutex); |
ad01c9e3 N |
2325 | /* Step 4, return new stripes to service */ |
2326 | while(!list_empty(&newstripes)) { | |
2327 | nsh = list_entry(newstripes.next, struct stripe_head, lru); | |
2328 | list_del_init(&nsh->lru); | |
d6f38f31 | 2329 | |
ad01c9e3 N |
2330 | for (i=conf->raid_disks; i < newsize; i++) |
2331 | if (nsh->dev[i].page == NULL) { | |
2332 | struct page *p = alloc_page(GFP_NOIO); | |
2333 | nsh->dev[i].page = p; | |
d592a996 | 2334 | nsh->dev[i].orig_page = p; |
ad01c9e3 N |
2335 | if (!p) |
2336 | err = -ENOMEM; | |
2337 | } | |
6d036f7d | 2338 | raid5_release_stripe(nsh); |
ad01c9e3 N |
2339 | } |
2340 | /* critical section pass, GFP_NOIO no longer needed */ | |
2341 | ||
2342 | conf->slab_cache = sc; | |
2343 | conf->active_name = 1-conf->active_name; | |
6e9eac2d N |
2344 | if (!err) |
2345 | conf->pool_size = newsize; | |
ad01c9e3 N |
2346 | return err; |
2347 | } | |
1da177e4 | 2348 | |
486f0644 | 2349 | static int drop_one_stripe(struct r5conf *conf) |
1da177e4 LT |
2350 | { |
2351 | struct stripe_head *sh; | |
49895bcc | 2352 | int hash = (conf->max_nr_stripes - 1) & STRIPE_HASH_LOCKS_MASK; |
1da177e4 | 2353 | |
566c09c5 SL |
2354 | spin_lock_irq(conf->hash_locks + hash); |
2355 | sh = get_free_stripe(conf, hash); | |
2356 | spin_unlock_irq(conf->hash_locks + hash); | |
3f294f4f N |
2357 | if (!sh) |
2358 | return 0; | |
78bafebd | 2359 | BUG_ON(atomic_read(&sh->count)); |
e4e11e38 | 2360 | shrink_buffers(sh); |
3f294f4f N |
2361 | kmem_cache_free(conf->slab_cache, sh); |
2362 | atomic_dec(&conf->active_stripes); | |
486f0644 | 2363 | conf->max_nr_stripes--; |
3f294f4f N |
2364 | return 1; |
2365 | } | |
2366 | ||
d1688a6d | 2367 | static void shrink_stripes(struct r5conf *conf) |
3f294f4f | 2368 | { |
486f0644 N |
2369 | while (conf->max_nr_stripes && |
2370 | drop_one_stripe(conf)) | |
2371 | ; | |
3f294f4f | 2372 | |
644df1a8 | 2373 | kmem_cache_destroy(conf->slab_cache); |
1da177e4 LT |
2374 | conf->slab_cache = NULL; |
2375 | } | |
2376 | ||
4246a0b6 | 2377 | static void raid5_end_read_request(struct bio * bi) |
1da177e4 | 2378 | { |
99c0fb5f | 2379 | struct stripe_head *sh = bi->bi_private; |
d1688a6d | 2380 | struct r5conf *conf = sh->raid_conf; |
7ecaa1e6 | 2381 | int disks = sh->disks, i; |
d6950432 | 2382 | char b[BDEVNAME_SIZE]; |
dd054fce | 2383 | struct md_rdev *rdev = NULL; |
05616be5 | 2384 | sector_t s; |
1da177e4 LT |
2385 | |
2386 | for (i=0 ; i<disks; i++) | |
2387 | if (bi == &sh->dev[i].req) | |
2388 | break; | |
2389 | ||
4246a0b6 | 2390 | pr_debug("end_read_request %llu/%d, count: %d, error %d.\n", |
45b4233c | 2391 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
4246a0b6 | 2392 | bi->bi_error); |
1da177e4 | 2393 | if (i == disks) { |
5f9d1fde | 2394 | bio_reset(bi); |
1da177e4 | 2395 | BUG(); |
6712ecf8 | 2396 | return; |
1da177e4 | 2397 | } |
14a75d3e | 2398 | if (test_bit(R5_ReadRepl, &sh->dev[i].flags)) |
dd054fce N |
2399 | /* If replacement finished while this request was outstanding, |
2400 | * 'replacement' might be NULL already. | |
2401 | * In that case it moved down to 'rdev'. | |
2402 | * rdev is not removed until all requests are finished. | |
2403 | */ | |
14a75d3e | 2404 | rdev = conf->disks[i].replacement; |
dd054fce | 2405 | if (!rdev) |
14a75d3e | 2406 | rdev = conf->disks[i].rdev; |
1da177e4 | 2407 | |
05616be5 N |
2408 | if (use_new_offset(conf, sh)) |
2409 | s = sh->sector + rdev->new_data_offset; | |
2410 | else | |
2411 | s = sh->sector + rdev->data_offset; | |
4246a0b6 | 2412 | if (!bi->bi_error) { |
1da177e4 | 2413 | set_bit(R5_UPTODATE, &sh->dev[i].flags); |
4e5314b5 | 2414 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { |
14a75d3e N |
2415 | /* Note that this cannot happen on a |
2416 | * replacement device. We just fail those on | |
2417 | * any error | |
2418 | */ | |
cc6167b4 N |
2419 | pr_info_ratelimited( |
2420 | "md/raid:%s: read error corrected (%lu sectors at %llu on %s)\n", | |
8bda470e | 2421 | mdname(conf->mddev), STRIPE_SECTORS, |
05616be5 | 2422 | (unsigned long long)s, |
8bda470e | 2423 | bdevname(rdev->bdev, b)); |
ddd5115f | 2424 | atomic_add(STRIPE_SECTORS, &rdev->corrected_errors); |
4e5314b5 N |
2425 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
2426 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
3f9e7c14 | 2427 | } else if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) |
2428 | clear_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
2429 | ||
86aa1397 SL |
2430 | if (test_bit(R5_InJournal, &sh->dev[i].flags)) |
2431 | /* | |
2432 | * end read for a page in journal, this | |
2433 | * must be preparing for prexor in rmw | |
2434 | */ | |
2435 | set_bit(R5_OrigPageUPTDODATE, &sh->dev[i].flags); | |
2436 | ||
14a75d3e N |
2437 | if (atomic_read(&rdev->read_errors)) |
2438 | atomic_set(&rdev->read_errors, 0); | |
1da177e4 | 2439 | } else { |
14a75d3e | 2440 | const char *bdn = bdevname(rdev->bdev, b); |
ba22dcbf | 2441 | int retry = 0; |
2e8ac303 | 2442 | int set_bad = 0; |
d6950432 | 2443 | |
1da177e4 | 2444 | clear_bit(R5_UPTODATE, &sh->dev[i].flags); |
d6950432 | 2445 | atomic_inc(&rdev->read_errors); |
14a75d3e | 2446 | if (test_bit(R5_ReadRepl, &sh->dev[i].flags)) |
cc6167b4 N |
2447 | pr_warn_ratelimited( |
2448 | "md/raid:%s: read error on replacement device (sector %llu on %s).\n", | |
14a75d3e | 2449 | mdname(conf->mddev), |
05616be5 | 2450 | (unsigned long long)s, |
14a75d3e | 2451 | bdn); |
2e8ac303 | 2452 | else if (conf->mddev->degraded >= conf->max_degraded) { |
2453 | set_bad = 1; | |
cc6167b4 N |
2454 | pr_warn_ratelimited( |
2455 | "md/raid:%s: read error not correctable (sector %llu on %s).\n", | |
8bda470e | 2456 | mdname(conf->mddev), |
05616be5 | 2457 | (unsigned long long)s, |
8bda470e | 2458 | bdn); |
2e8ac303 | 2459 | } else if (test_bit(R5_ReWrite, &sh->dev[i].flags)) { |
4e5314b5 | 2460 | /* Oh, no!!! */ |
2e8ac303 | 2461 | set_bad = 1; |
cc6167b4 N |
2462 | pr_warn_ratelimited( |
2463 | "md/raid:%s: read error NOT corrected!! (sector %llu on %s).\n", | |
8bda470e | 2464 | mdname(conf->mddev), |
05616be5 | 2465 | (unsigned long long)s, |
8bda470e | 2466 | bdn); |
2e8ac303 | 2467 | } else if (atomic_read(&rdev->read_errors) |
ba22dcbf | 2468 | > conf->max_nr_stripes) |
cc6167b4 | 2469 | pr_warn("md/raid:%s: Too many read errors, failing device %s.\n", |
d6950432 | 2470 | mdname(conf->mddev), bdn); |
ba22dcbf N |
2471 | else |
2472 | retry = 1; | |
edfa1f65 BY |
2473 | if (set_bad && test_bit(In_sync, &rdev->flags) |
2474 | && !test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) | |
2475 | retry = 1; | |
ba22dcbf | 2476 | if (retry) |
3f9e7c14 | 2477 | if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) { |
2478 | set_bit(R5_ReadError, &sh->dev[i].flags); | |
2479 | clear_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
2480 | } else | |
2481 | set_bit(R5_ReadNoMerge, &sh->dev[i].flags); | |
ba22dcbf | 2482 | else { |
4e5314b5 N |
2483 | clear_bit(R5_ReadError, &sh->dev[i].flags); |
2484 | clear_bit(R5_ReWrite, &sh->dev[i].flags); | |
2e8ac303 | 2485 | if (!(set_bad |
2486 | && test_bit(In_sync, &rdev->flags) | |
2487 | && rdev_set_badblocks( | |
2488 | rdev, sh->sector, STRIPE_SECTORS, 0))) | |
2489 | md_error(conf->mddev, rdev); | |
ba22dcbf | 2490 | } |
1da177e4 | 2491 | } |
14a75d3e | 2492 | rdev_dec_pending(rdev, conf->mddev); |
c9445555 | 2493 | bio_reset(bi); |
1da177e4 LT |
2494 | clear_bit(R5_LOCKED, &sh->dev[i].flags); |
2495 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 2496 | raid5_release_stripe(sh); |
1da177e4 LT |
2497 | } |
2498 | ||
4246a0b6 | 2499 | static void raid5_end_write_request(struct bio *bi) |
1da177e4 | 2500 | { |
99c0fb5f | 2501 | struct stripe_head *sh = bi->bi_private; |
d1688a6d | 2502 | struct r5conf *conf = sh->raid_conf; |
7ecaa1e6 | 2503 | int disks = sh->disks, i; |
977df362 | 2504 | struct md_rdev *uninitialized_var(rdev); |
b84db560 N |
2505 | sector_t first_bad; |
2506 | int bad_sectors; | |
977df362 | 2507 | int replacement = 0; |
1da177e4 | 2508 | |
977df362 N |
2509 | for (i = 0 ; i < disks; i++) { |
2510 | if (bi == &sh->dev[i].req) { | |
2511 | rdev = conf->disks[i].rdev; | |
1da177e4 | 2512 | break; |
977df362 N |
2513 | } |
2514 | if (bi == &sh->dev[i].rreq) { | |
2515 | rdev = conf->disks[i].replacement; | |
dd054fce N |
2516 | if (rdev) |
2517 | replacement = 1; | |
2518 | else | |
2519 | /* rdev was removed and 'replacement' | |
2520 | * replaced it. rdev is not removed | |
2521 | * until all requests are finished. | |
2522 | */ | |
2523 | rdev = conf->disks[i].rdev; | |
977df362 N |
2524 | break; |
2525 | } | |
2526 | } | |
4246a0b6 | 2527 | pr_debug("end_write_request %llu/%d, count %d, error: %d.\n", |
1da177e4 | 2528 | (unsigned long long)sh->sector, i, atomic_read(&sh->count), |
4246a0b6 | 2529 | bi->bi_error); |
1da177e4 | 2530 | if (i == disks) { |
5f9d1fde | 2531 | bio_reset(bi); |
1da177e4 | 2532 | BUG(); |
6712ecf8 | 2533 | return; |
1da177e4 LT |
2534 | } |
2535 | ||
977df362 | 2536 | if (replacement) { |
4246a0b6 | 2537 | if (bi->bi_error) |
977df362 N |
2538 | md_error(conf->mddev, rdev); |
2539 | else if (is_badblock(rdev, sh->sector, | |
2540 | STRIPE_SECTORS, | |
2541 | &first_bad, &bad_sectors)) | |
2542 | set_bit(R5_MadeGoodRepl, &sh->dev[i].flags); | |
2543 | } else { | |
4246a0b6 | 2544 | if (bi->bi_error) { |
9f97e4b1 | 2545 | set_bit(STRIPE_DEGRADED, &sh->state); |
977df362 N |
2546 | set_bit(WriteErrorSeen, &rdev->flags); |
2547 | set_bit(R5_WriteError, &sh->dev[i].flags); | |
3a6de292 N |
2548 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) |
2549 | set_bit(MD_RECOVERY_NEEDED, | |
2550 | &rdev->mddev->recovery); | |
977df362 N |
2551 | } else if (is_badblock(rdev, sh->sector, |
2552 | STRIPE_SECTORS, | |
c0b32972 | 2553 | &first_bad, &bad_sectors)) { |
977df362 | 2554 | set_bit(R5_MadeGood, &sh->dev[i].flags); |
c0b32972 N |
2555 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) |
2556 | /* That was a successful write so make | |
2557 | * sure it looks like we already did | |
2558 | * a re-write. | |
2559 | */ | |
2560 | set_bit(R5_ReWrite, &sh->dev[i].flags); | |
2561 | } | |
977df362 N |
2562 | } |
2563 | rdev_dec_pending(rdev, conf->mddev); | |
1da177e4 | 2564 | |
4246a0b6 | 2565 | if (sh->batch_head && bi->bi_error && !replacement) |
72ac7330 | 2566 | set_bit(STRIPE_BATCH_ERR, &sh->batch_head->state); |
2567 | ||
c9445555 | 2568 | bio_reset(bi); |
977df362 N |
2569 | if (!test_and_clear_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags)) |
2570 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
1da177e4 | 2571 | set_bit(STRIPE_HANDLE, &sh->state); |
6d036f7d | 2572 | raid5_release_stripe(sh); |
59fc630b | 2573 | |
2574 | if (sh->batch_head && sh != sh->batch_head) | |
6d036f7d | 2575 | raid5_release_stripe(sh->batch_head); |
1da177e4 LT |
2576 | } |
2577 | ||
784052ec | 2578 | static void raid5_build_block(struct stripe_head *sh, int i, int previous) |
1da177e4 LT |
2579 | { |
2580 | struct r5dev *dev = &sh->dev[i]; | |
2581 | ||
1da177e4 | 2582 | dev->flags = 0; |
6d036f7d | 2583 | dev->sector = raid5_compute_blocknr(sh, i, previous); |
1da177e4 LT |
2584 | } |
2585 | ||
849674e4 | 2586 | static void raid5_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
2587 | { |
2588 | char b[BDEVNAME_SIZE]; | |
d1688a6d | 2589 | struct r5conf *conf = mddev->private; |
908f4fbd | 2590 | unsigned long flags; |
0c55e022 | 2591 | pr_debug("raid456: error called\n"); |
1da177e4 | 2592 | |
908f4fbd N |
2593 | spin_lock_irqsave(&conf->device_lock, flags); |
2594 | clear_bit(In_sync, &rdev->flags); | |
2e38a37f | 2595 | mddev->degraded = raid5_calc_degraded(conf); |
908f4fbd N |
2596 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2597 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2598 | ||
de393cde | 2599 | set_bit(Blocked, &rdev->flags); |
6f8d0c77 | 2600 | set_bit(Faulty, &rdev->flags); |
2953079c SL |
2601 | set_mask_bits(&mddev->sb_flags, 0, |
2602 | BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); | |
cc6167b4 N |
2603 | pr_crit("md/raid:%s: Disk failure on %s, disabling device.\n" |
2604 | "md/raid:%s: Operation continuing on %d devices.\n", | |
2605 | mdname(mddev), | |
2606 | bdevname(rdev->bdev, b), | |
2607 | mdname(mddev), | |
2608 | conf->raid_disks - mddev->degraded); | |
2e38a37f | 2609 | r5c_update_on_rdev_error(mddev); |
16a53ecc | 2610 | } |
1da177e4 LT |
2611 | |
2612 | /* | |
2613 | * Input: a 'big' sector number, | |
2614 | * Output: index of the data and parity disk, and the sector # in them. | |
2615 | */ | |
6d036f7d SL |
2616 | sector_t raid5_compute_sector(struct r5conf *conf, sector_t r_sector, |
2617 | int previous, int *dd_idx, | |
2618 | struct stripe_head *sh) | |
1da177e4 | 2619 | { |
6e3b96ed | 2620 | sector_t stripe, stripe2; |
35f2a591 | 2621 | sector_t chunk_number; |
1da177e4 | 2622 | unsigned int chunk_offset; |
911d4ee8 | 2623 | int pd_idx, qd_idx; |
67cc2b81 | 2624 | int ddf_layout = 0; |
1da177e4 | 2625 | sector_t new_sector; |
e183eaed N |
2626 | int algorithm = previous ? conf->prev_algo |
2627 | : conf->algorithm; | |
09c9e5fa AN |
2628 | int sectors_per_chunk = previous ? conf->prev_chunk_sectors |
2629 | : conf->chunk_sectors; | |
112bf897 N |
2630 | int raid_disks = previous ? conf->previous_raid_disks |
2631 | : conf->raid_disks; | |
2632 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 LT |
2633 | |
2634 | /* First compute the information on this sector */ | |
2635 | ||
2636 | /* | |
2637 | * Compute the chunk number and the sector offset inside the chunk | |
2638 | */ | |
2639 | chunk_offset = sector_div(r_sector, sectors_per_chunk); | |
2640 | chunk_number = r_sector; | |
1da177e4 LT |
2641 | |
2642 | /* | |
2643 | * Compute the stripe number | |
2644 | */ | |
35f2a591 N |
2645 | stripe = chunk_number; |
2646 | *dd_idx = sector_div(stripe, data_disks); | |
6e3b96ed | 2647 | stripe2 = stripe; |
1da177e4 LT |
2648 | /* |
2649 | * Select the parity disk based on the user selected algorithm. | |
2650 | */ | |
84789554 | 2651 | pd_idx = qd_idx = -1; |
16a53ecc N |
2652 | switch(conf->level) { |
2653 | case 4: | |
911d4ee8 | 2654 | pd_idx = data_disks; |
16a53ecc N |
2655 | break; |
2656 | case 5: | |
e183eaed | 2657 | switch (algorithm) { |
1da177e4 | 2658 | case ALGORITHM_LEFT_ASYMMETRIC: |
6e3b96ed | 2659 | pd_idx = data_disks - sector_div(stripe2, raid_disks); |
911d4ee8 | 2660 | if (*dd_idx >= pd_idx) |
1da177e4 LT |
2661 | (*dd_idx)++; |
2662 | break; | |
2663 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
6e3b96ed | 2664 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 | 2665 | if (*dd_idx >= pd_idx) |
1da177e4 LT |
2666 | (*dd_idx)++; |
2667 | break; | |
2668 | case ALGORITHM_LEFT_SYMMETRIC: | |
6e3b96ed | 2669 | pd_idx = data_disks - sector_div(stripe2, raid_disks); |
911d4ee8 | 2670 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; |
1da177e4 LT |
2671 | break; |
2672 | case ALGORITHM_RIGHT_SYMMETRIC: | |
6e3b96ed | 2673 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 | 2674 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; |
1da177e4 | 2675 | break; |
99c0fb5f N |
2676 | case ALGORITHM_PARITY_0: |
2677 | pd_idx = 0; | |
2678 | (*dd_idx)++; | |
2679 | break; | |
2680 | case ALGORITHM_PARITY_N: | |
2681 | pd_idx = data_disks; | |
2682 | break; | |
1da177e4 | 2683 | default: |
99c0fb5f | 2684 | BUG(); |
16a53ecc N |
2685 | } |
2686 | break; | |
2687 | case 6: | |
2688 | ||
e183eaed | 2689 | switch (algorithm) { |
16a53ecc | 2690 | case ALGORITHM_LEFT_ASYMMETRIC: |
6e3b96ed | 2691 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
911d4ee8 N |
2692 | qd_idx = pd_idx + 1; |
2693 | if (pd_idx == raid_disks-1) { | |
99c0fb5f | 2694 | (*dd_idx)++; /* Q D D D P */ |
911d4ee8 N |
2695 | qd_idx = 0; |
2696 | } else if (*dd_idx >= pd_idx) | |
16a53ecc N |
2697 | (*dd_idx) += 2; /* D D P Q D */ |
2698 | break; | |
2699 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
6e3b96ed | 2700 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 N |
2701 | qd_idx = pd_idx + 1; |
2702 | if (pd_idx == raid_disks-1) { | |
99c0fb5f | 2703 | (*dd_idx)++; /* Q D D D P */ |
911d4ee8 N |
2704 | qd_idx = 0; |
2705 | } else if (*dd_idx >= pd_idx) | |
16a53ecc N |
2706 | (*dd_idx) += 2; /* D D P Q D */ |
2707 | break; | |
2708 | case ALGORITHM_LEFT_SYMMETRIC: | |
6e3b96ed | 2709 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
911d4ee8 N |
2710 | qd_idx = (pd_idx + 1) % raid_disks; |
2711 | *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; | |
16a53ecc N |
2712 | break; |
2713 | case ALGORITHM_RIGHT_SYMMETRIC: | |
6e3b96ed | 2714 | pd_idx = sector_div(stripe2, raid_disks); |
911d4ee8 N |
2715 | qd_idx = (pd_idx + 1) % raid_disks; |
2716 | *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; | |
16a53ecc | 2717 | break; |
99c0fb5f N |
2718 | |
2719 | case ALGORITHM_PARITY_0: | |
2720 | pd_idx = 0; | |
2721 | qd_idx = 1; | |
2722 | (*dd_idx) += 2; | |
2723 | break; | |
2724 | case ALGORITHM_PARITY_N: | |
2725 | pd_idx = data_disks; | |
2726 | qd_idx = data_disks + 1; | |
2727 | break; | |
2728 | ||
2729 | case ALGORITHM_ROTATING_ZERO_RESTART: | |
2730 | /* Exactly the same as RIGHT_ASYMMETRIC, but or | |
2731 | * of blocks for computing Q is different. | |
2732 | */ | |
6e3b96ed | 2733 | pd_idx = sector_div(stripe2, raid_disks); |
99c0fb5f N |
2734 | qd_idx = pd_idx + 1; |
2735 | if (pd_idx == raid_disks-1) { | |
2736 | (*dd_idx)++; /* Q D D D P */ | |
2737 | qd_idx = 0; | |
2738 | } else if (*dd_idx >= pd_idx) | |
2739 | (*dd_idx) += 2; /* D D P Q D */ | |
67cc2b81 | 2740 | ddf_layout = 1; |
99c0fb5f N |
2741 | break; |
2742 | ||
2743 | case ALGORITHM_ROTATING_N_RESTART: | |
2744 | /* Same a left_asymmetric, by first stripe is | |
2745 | * D D D P Q rather than | |
2746 | * Q D D D P | |
2747 | */ | |
6e3b96ed N |
2748 | stripe2 += 1; |
2749 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); | |
99c0fb5f N |
2750 | qd_idx = pd_idx + 1; |
2751 | if (pd_idx == raid_disks-1) { | |
2752 | (*dd_idx)++; /* Q D D D P */ | |
2753 | qd_idx = 0; | |
2754 | } else if (*dd_idx >= pd_idx) | |
2755 | (*dd_idx) += 2; /* D D P Q D */ | |
67cc2b81 | 2756 | ddf_layout = 1; |
99c0fb5f N |
2757 | break; |
2758 | ||
2759 | case ALGORITHM_ROTATING_N_CONTINUE: | |
2760 | /* Same as left_symmetric but Q is before P */ | |
6e3b96ed | 2761 | pd_idx = raid_disks - 1 - sector_div(stripe2, raid_disks); |
99c0fb5f N |
2762 | qd_idx = (pd_idx + raid_disks - 1) % raid_disks; |
2763 | *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; | |
67cc2b81 | 2764 | ddf_layout = 1; |
99c0fb5f N |
2765 | break; |
2766 | ||
2767 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
2768 | /* RAID5 left_asymmetric, with Q on last device */ | |
6e3b96ed | 2769 | pd_idx = data_disks - sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2770 | if (*dd_idx >= pd_idx) |
2771 | (*dd_idx)++; | |
2772 | qd_idx = raid_disks - 1; | |
2773 | break; | |
2774 | ||
2775 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
6e3b96ed | 2776 | pd_idx = sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2777 | if (*dd_idx >= pd_idx) |
2778 | (*dd_idx)++; | |
2779 | qd_idx = raid_disks - 1; | |
2780 | break; | |
2781 | ||
2782 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
6e3b96ed | 2783 | pd_idx = data_disks - sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2784 | *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); |
2785 | qd_idx = raid_disks - 1; | |
2786 | break; | |
2787 | ||
2788 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
6e3b96ed | 2789 | pd_idx = sector_div(stripe2, raid_disks-1); |
99c0fb5f N |
2790 | *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); |
2791 | qd_idx = raid_disks - 1; | |
2792 | break; | |
2793 | ||
2794 | case ALGORITHM_PARITY_0_6: | |
2795 | pd_idx = 0; | |
2796 | (*dd_idx)++; | |
2797 | qd_idx = raid_disks - 1; | |
2798 | break; | |
2799 | ||
16a53ecc | 2800 | default: |
99c0fb5f | 2801 | BUG(); |
16a53ecc N |
2802 | } |
2803 | break; | |
1da177e4 LT |
2804 | } |
2805 | ||
911d4ee8 N |
2806 | if (sh) { |
2807 | sh->pd_idx = pd_idx; | |
2808 | sh->qd_idx = qd_idx; | |
67cc2b81 | 2809 | sh->ddf_layout = ddf_layout; |
911d4ee8 | 2810 | } |
1da177e4 LT |
2811 | /* |
2812 | * Finally, compute the new sector number | |
2813 | */ | |
2814 | new_sector = (sector_t)stripe * sectors_per_chunk + chunk_offset; | |
2815 | return new_sector; | |
2816 | } | |
2817 | ||
6d036f7d | 2818 | sector_t raid5_compute_blocknr(struct stripe_head *sh, int i, int previous) |
1da177e4 | 2819 | { |
d1688a6d | 2820 | struct r5conf *conf = sh->raid_conf; |
b875e531 N |
2821 | int raid_disks = sh->disks; |
2822 | int data_disks = raid_disks - conf->max_degraded; | |
1da177e4 | 2823 | sector_t new_sector = sh->sector, check; |
09c9e5fa AN |
2824 | int sectors_per_chunk = previous ? conf->prev_chunk_sectors |
2825 | : conf->chunk_sectors; | |
e183eaed N |
2826 | int algorithm = previous ? conf->prev_algo |
2827 | : conf->algorithm; | |
1da177e4 LT |
2828 | sector_t stripe; |
2829 | int chunk_offset; | |
35f2a591 N |
2830 | sector_t chunk_number; |
2831 | int dummy1, dd_idx = i; | |
1da177e4 | 2832 | sector_t r_sector; |
911d4ee8 | 2833 | struct stripe_head sh2; |
1da177e4 LT |
2834 | |
2835 | chunk_offset = sector_div(new_sector, sectors_per_chunk); | |
2836 | stripe = new_sector; | |
1da177e4 | 2837 | |
16a53ecc N |
2838 | if (i == sh->pd_idx) |
2839 | return 0; | |
2840 | switch(conf->level) { | |
2841 | case 4: break; | |
2842 | case 5: | |
e183eaed | 2843 | switch (algorithm) { |
1da177e4 LT |
2844 | case ALGORITHM_LEFT_ASYMMETRIC: |
2845 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
2846 | if (i > sh->pd_idx) | |
2847 | i--; | |
2848 | break; | |
2849 | case ALGORITHM_LEFT_SYMMETRIC: | |
2850 | case ALGORITHM_RIGHT_SYMMETRIC: | |
2851 | if (i < sh->pd_idx) | |
2852 | i += raid_disks; | |
2853 | i -= (sh->pd_idx + 1); | |
2854 | break; | |
99c0fb5f N |
2855 | case ALGORITHM_PARITY_0: |
2856 | i -= 1; | |
2857 | break; | |
2858 | case ALGORITHM_PARITY_N: | |
2859 | break; | |
1da177e4 | 2860 | default: |
99c0fb5f | 2861 | BUG(); |
16a53ecc N |
2862 | } |
2863 | break; | |
2864 | case 6: | |
d0dabf7e | 2865 | if (i == sh->qd_idx) |
16a53ecc | 2866 | return 0; /* It is the Q disk */ |
e183eaed | 2867 | switch (algorithm) { |
16a53ecc N |
2868 | case ALGORITHM_LEFT_ASYMMETRIC: |
2869 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
99c0fb5f N |
2870 | case ALGORITHM_ROTATING_ZERO_RESTART: |
2871 | case ALGORITHM_ROTATING_N_RESTART: | |
2872 | if (sh->pd_idx == raid_disks-1) | |
2873 | i--; /* Q D D D P */ | |
16a53ecc N |
2874 | else if (i > sh->pd_idx) |
2875 | i -= 2; /* D D P Q D */ | |
2876 | break; | |
2877 | case ALGORITHM_LEFT_SYMMETRIC: | |
2878 | case ALGORITHM_RIGHT_SYMMETRIC: | |
2879 | if (sh->pd_idx == raid_disks-1) | |
2880 | i--; /* Q D D D P */ | |
2881 | else { | |
2882 | /* D D P Q D */ | |
2883 | if (i < sh->pd_idx) | |
2884 | i += raid_disks; | |
2885 | i -= (sh->pd_idx + 2); | |
2886 | } | |
2887 | break; | |
99c0fb5f N |
2888 | case ALGORITHM_PARITY_0: |
2889 | i -= 2; | |
2890 | break; | |
2891 | case ALGORITHM_PARITY_N: | |
2892 | break; | |
2893 | case ALGORITHM_ROTATING_N_CONTINUE: | |
e4424fee | 2894 | /* Like left_symmetric, but P is before Q */ |
99c0fb5f N |
2895 | if (sh->pd_idx == 0) |
2896 | i--; /* P D D D Q */ | |
e4424fee N |
2897 | else { |
2898 | /* D D Q P D */ | |
2899 | if (i < sh->pd_idx) | |
2900 | i += raid_disks; | |
2901 | i -= (sh->pd_idx + 1); | |
2902 | } | |
99c0fb5f N |
2903 | break; |
2904 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
2905 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
2906 | if (i > sh->pd_idx) | |
2907 | i--; | |
2908 | break; | |
2909 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
2910 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
2911 | if (i < sh->pd_idx) | |
2912 | i += data_disks + 1; | |
2913 | i -= (sh->pd_idx + 1); | |
2914 | break; | |
2915 | case ALGORITHM_PARITY_0_6: | |
2916 | i -= 1; | |
2917 | break; | |
16a53ecc | 2918 | default: |
99c0fb5f | 2919 | BUG(); |
16a53ecc N |
2920 | } |
2921 | break; | |
1da177e4 LT |
2922 | } |
2923 | ||
2924 | chunk_number = stripe * data_disks + i; | |
35f2a591 | 2925 | r_sector = chunk_number * sectors_per_chunk + chunk_offset; |
1da177e4 | 2926 | |
112bf897 | 2927 | check = raid5_compute_sector(conf, r_sector, |
784052ec | 2928 | previous, &dummy1, &sh2); |
911d4ee8 N |
2929 | if (check != sh->sector || dummy1 != dd_idx || sh2.pd_idx != sh->pd_idx |
2930 | || sh2.qd_idx != sh->qd_idx) { | |
cc6167b4 N |
2931 | pr_warn("md/raid:%s: compute_blocknr: map not correct\n", |
2932 | mdname(conf->mddev)); | |
1da177e4 LT |
2933 | return 0; |
2934 | } | |
2935 | return r_sector; | |
2936 | } | |
2937 | ||
07e83364 SL |
2938 | /* |
2939 | * There are cases where we want handle_stripe_dirtying() and | |
2940 | * schedule_reconstruction() to delay towrite to some dev of a stripe. | |
2941 | * | |
2942 | * This function checks whether we want to delay the towrite. Specifically, | |
2943 | * we delay the towrite when: | |
2944 | * | |
2945 | * 1. degraded stripe has a non-overwrite to the missing dev, AND this | |
2946 | * stripe has data in journal (for other devices). | |
2947 | * | |
2948 | * In this case, when reading data for the non-overwrite dev, it is | |
2949 | * necessary to handle complex rmw of write back cache (prexor with | |
2950 | * orig_page, and xor with page). To keep read path simple, we would | |
2951 | * like to flush data in journal to RAID disks first, so complex rmw | |
2952 | * is handled in the write patch (handle_stripe_dirtying). | |
2953 | * | |
39b99586 SL |
2954 | * 2. when journal space is critical (R5C_LOG_CRITICAL=1) |
2955 | * | |
2956 | * It is important to be able to flush all stripes in raid5-cache. | |
2957 | * Therefore, we need reserve some space on the journal device for | |
2958 | * these flushes. If flush operation includes pending writes to the | |
2959 | * stripe, we need to reserve (conf->raid_disk + 1) pages per stripe | |
2960 | * for the flush out. If we exclude these pending writes from flush | |
2961 | * operation, we only need (conf->max_degraded + 1) pages per stripe. | |
2962 | * Therefore, excluding pending writes in these cases enables more | |
2963 | * efficient use of the journal device. | |
2964 | * | |
2965 | * Note: To make sure the stripe makes progress, we only delay | |
2966 | * towrite for stripes with data already in journal (injournal > 0). | |
2967 | * When LOG_CRITICAL, stripes with injournal == 0 will be sent to | |
2968 | * no_space_stripes list. | |
2969 | * | |
07e83364 | 2970 | */ |
39b99586 SL |
2971 | static inline bool delay_towrite(struct r5conf *conf, |
2972 | struct r5dev *dev, | |
2973 | struct stripe_head_state *s) | |
07e83364 | 2974 | { |
39b99586 SL |
2975 | /* case 1 above */ |
2976 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
2977 | !test_bit(R5_Insync, &dev->flags) && s->injournal) | |
2978 | return true; | |
2979 | /* case 2 above */ | |
2980 | if (test_bit(R5C_LOG_CRITICAL, &conf->cache_state) && | |
2981 | s->injournal > 0) | |
2982 | return true; | |
2983 | return false; | |
07e83364 SL |
2984 | } |
2985 | ||
600aa109 | 2986 | static void |
c0f7bddb | 2987 | schedule_reconstruction(struct stripe_head *sh, struct stripe_head_state *s, |
600aa109 | 2988 | int rcw, int expand) |
e33129d8 | 2989 | { |
584acdd4 | 2990 | int i, pd_idx = sh->pd_idx, qd_idx = sh->qd_idx, disks = sh->disks; |
d1688a6d | 2991 | struct r5conf *conf = sh->raid_conf; |
c0f7bddb | 2992 | int level = conf->level; |
e33129d8 DW |
2993 | |
2994 | if (rcw) { | |
1e6d690b SL |
2995 | /* |
2996 | * In some cases, handle_stripe_dirtying initially decided to | |
2997 | * run rmw and allocates extra page for prexor. However, rcw is | |
2998 | * cheaper later on. We need to free the extra page now, | |
2999 | * because we won't be able to do that in ops_complete_prexor(). | |
3000 | */ | |
3001 | r5c_release_extra_page(sh); | |
e33129d8 DW |
3002 | |
3003 | for (i = disks; i--; ) { | |
3004 | struct r5dev *dev = &sh->dev[i]; | |
3005 | ||
39b99586 | 3006 | if (dev->towrite && !delay_towrite(conf, dev, s)) { |
e33129d8 | 3007 | set_bit(R5_LOCKED, &dev->flags); |
d8ee0728 | 3008 | set_bit(R5_Wantdrain, &dev->flags); |
e33129d8 DW |
3009 | if (!expand) |
3010 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 3011 | s->locked++; |
1e6d690b SL |
3012 | } else if (test_bit(R5_InJournal, &dev->flags)) { |
3013 | set_bit(R5_LOCKED, &dev->flags); | |
3014 | s->locked++; | |
e33129d8 DW |
3015 | } |
3016 | } | |
ce7d363a N |
3017 | /* if we are not expanding this is a proper write request, and |
3018 | * there will be bios with new data to be drained into the | |
3019 | * stripe cache | |
3020 | */ | |
3021 | if (!expand) { | |
3022 | if (!s->locked) | |
3023 | /* False alarm, nothing to do */ | |
3024 | return; | |
3025 | sh->reconstruct_state = reconstruct_state_drain_run; | |
3026 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
3027 | } else | |
3028 | sh->reconstruct_state = reconstruct_state_run; | |
3029 | ||
3030 | set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); | |
3031 | ||
c0f7bddb | 3032 | if (s->locked + conf->max_degraded == disks) |
8b3e6cdc | 3033 | if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state)) |
c0f7bddb | 3034 | atomic_inc(&conf->pending_full_writes); |
e33129d8 DW |
3035 | } else { |
3036 | BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) || | |
3037 | test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags))); | |
584acdd4 MS |
3038 | BUG_ON(level == 6 && |
3039 | (!(test_bit(R5_UPTODATE, &sh->dev[qd_idx].flags) || | |
3040 | test_bit(R5_Wantcompute, &sh->dev[qd_idx].flags)))); | |
e33129d8 | 3041 | |
e33129d8 DW |
3042 | for (i = disks; i--; ) { |
3043 | struct r5dev *dev = &sh->dev[i]; | |
584acdd4 | 3044 | if (i == pd_idx || i == qd_idx) |
e33129d8 DW |
3045 | continue; |
3046 | ||
e33129d8 DW |
3047 | if (dev->towrite && |
3048 | (test_bit(R5_UPTODATE, &dev->flags) || | |
d8ee0728 DW |
3049 | test_bit(R5_Wantcompute, &dev->flags))) { |
3050 | set_bit(R5_Wantdrain, &dev->flags); | |
e33129d8 DW |
3051 | set_bit(R5_LOCKED, &dev->flags); |
3052 | clear_bit(R5_UPTODATE, &dev->flags); | |
600aa109 | 3053 | s->locked++; |
1e6d690b SL |
3054 | } else if (test_bit(R5_InJournal, &dev->flags)) { |
3055 | set_bit(R5_LOCKED, &dev->flags); | |
3056 | s->locked++; | |
e33129d8 DW |
3057 | } |
3058 | } | |
ce7d363a N |
3059 | if (!s->locked) |
3060 | /* False alarm - nothing to do */ | |
3061 | return; | |
3062 | sh->reconstruct_state = reconstruct_state_prexor_drain_run; | |
3063 | set_bit(STRIPE_OP_PREXOR, &s->ops_request); | |
3064 | set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); | |
3065 | set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); | |
e33129d8 DW |
3066 | } |
3067 | ||
c0f7bddb | 3068 | /* keep the parity disk(s) locked while asynchronous operations |
e33129d8 DW |
3069 | * are in flight |
3070 | */ | |
3071 | set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); | |
3072 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
600aa109 | 3073 | s->locked++; |
e33129d8 | 3074 | |
c0f7bddb YT |
3075 | if (level == 6) { |
3076 | int qd_idx = sh->qd_idx; | |
3077 | struct r5dev *dev = &sh->dev[qd_idx]; | |
3078 | ||
3079 | set_bit(R5_LOCKED, &dev->flags); | |
3080 | clear_bit(R5_UPTODATE, &dev->flags); | |
3081 | s->locked++; | |
3082 | } | |
3083 | ||
600aa109 | 3084 | pr_debug("%s: stripe %llu locked: %d ops_request: %lx\n", |
e46b272b | 3085 | __func__, (unsigned long long)sh->sector, |
600aa109 | 3086 | s->locked, s->ops_request); |
e33129d8 | 3087 | } |
16a53ecc | 3088 | |
1da177e4 LT |
3089 | /* |
3090 | * Each stripe/dev can have one or more bion attached. | |
16a53ecc | 3091 | * toread/towrite point to the first in a chain. |
1da177e4 LT |
3092 | * The bi_next chain must be in order. |
3093 | */ | |
da41ba65 | 3094 | static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, |
3095 | int forwrite, int previous) | |
1da177e4 LT |
3096 | { |
3097 | struct bio **bip; | |
d1688a6d | 3098 | struct r5conf *conf = sh->raid_conf; |
72626685 | 3099 | int firstwrite=0; |
1da177e4 | 3100 | |
cbe47ec5 | 3101 | pr_debug("adding bi b#%llu to stripe s#%llu\n", |
4f024f37 | 3102 | (unsigned long long)bi->bi_iter.bi_sector, |
1da177e4 LT |
3103 | (unsigned long long)sh->sector); |
3104 | ||
b17459c0 SL |
3105 | /* |
3106 | * If several bio share a stripe. The bio bi_phys_segments acts as a | |
3107 | * reference count to avoid race. The reference count should already be | |
3108 | * increased before this function is called (for example, in | |
849674e4 | 3109 | * raid5_make_request()), so other bio sharing this stripe will not free the |
b17459c0 SL |
3110 | * stripe. If a stripe is owned by one stripe, the stripe lock will |
3111 | * protect it. | |
3112 | */ | |
3113 | spin_lock_irq(&sh->stripe_lock); | |
59fc630b | 3114 | /* Don't allow new IO added to stripes in batch list */ |
3115 | if (sh->batch_head) | |
3116 | goto overlap; | |
72626685 | 3117 | if (forwrite) { |
1da177e4 | 3118 | bip = &sh->dev[dd_idx].towrite; |
7eaf7e8e | 3119 | if (*bip == NULL) |
72626685 N |
3120 | firstwrite = 1; |
3121 | } else | |
1da177e4 | 3122 | bip = &sh->dev[dd_idx].toread; |
4f024f37 KO |
3123 | while (*bip && (*bip)->bi_iter.bi_sector < bi->bi_iter.bi_sector) { |
3124 | if (bio_end_sector(*bip) > bi->bi_iter.bi_sector) | |
1da177e4 LT |
3125 | goto overlap; |
3126 | bip = & (*bip)->bi_next; | |
3127 | } | |
4f024f37 | 3128 | if (*bip && (*bip)->bi_iter.bi_sector < bio_end_sector(bi)) |
1da177e4 LT |
3129 | goto overlap; |
3130 | ||
da41ba65 | 3131 | if (!forwrite || previous) |
3132 | clear_bit(STRIPE_BATCH_READY, &sh->state); | |
3133 | ||
78bafebd | 3134 | BUG_ON(*bip && bi->bi_next && (*bip) != bi->bi_next); |
1da177e4 LT |
3135 | if (*bip) |
3136 | bi->bi_next = *bip; | |
3137 | *bip = bi; | |
e7836bd6 | 3138 | raid5_inc_bi_active_stripes(bi); |
72626685 | 3139 | |
1da177e4 LT |
3140 | if (forwrite) { |
3141 | /* check if page is covered */ | |
3142 | sector_t sector = sh->dev[dd_idx].sector; | |
3143 | for (bi=sh->dev[dd_idx].towrite; | |
3144 | sector < sh->dev[dd_idx].sector + STRIPE_SECTORS && | |
4f024f37 | 3145 | bi && bi->bi_iter.bi_sector <= sector; |
1da177e4 | 3146 | bi = r5_next_bio(bi, sh->dev[dd_idx].sector)) { |
f73a1c7d KO |
3147 | if (bio_end_sector(bi) >= sector) |
3148 | sector = bio_end_sector(bi); | |
1da177e4 LT |
3149 | } |
3150 | if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS) | |
7a87f434 | 3151 | if (!test_and_set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags)) |
3152 | sh->overwrite_disks++; | |
1da177e4 | 3153 | } |
cbe47ec5 N |
3154 | |
3155 | pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n", | |
4f024f37 | 3156 | (unsigned long long)(*bip)->bi_iter.bi_sector, |
cbe47ec5 N |
3157 | (unsigned long long)sh->sector, dd_idx); |
3158 | ||
3159 | if (conf->mddev->bitmap && firstwrite) { | |
d0852df5 N |
3160 | /* Cannot hold spinlock over bitmap_startwrite, |
3161 | * but must ensure this isn't added to a batch until | |
3162 | * we have added to the bitmap and set bm_seq. | |
3163 | * So set STRIPE_BITMAP_PENDING to prevent | |
3164 | * batching. | |
3165 | * If multiple add_stripe_bio() calls race here they | |
3166 | * much all set STRIPE_BITMAP_PENDING. So only the first one | |
3167 | * to complete "bitmap_startwrite" gets to set | |
3168 | * STRIPE_BIT_DELAY. This is important as once a stripe | |
3169 | * is added to a batch, STRIPE_BIT_DELAY cannot be changed | |
3170 | * any more. | |
3171 | */ | |
3172 | set_bit(STRIPE_BITMAP_PENDING, &sh->state); | |
3173 | spin_unlock_irq(&sh->stripe_lock); | |
cbe47ec5 N |
3174 | bitmap_startwrite(conf->mddev->bitmap, sh->sector, |
3175 | STRIPE_SECTORS, 0); | |
d0852df5 N |
3176 | spin_lock_irq(&sh->stripe_lock); |
3177 | clear_bit(STRIPE_BITMAP_PENDING, &sh->state); | |
3178 | if (!sh->batch_head) { | |
3179 | sh->bm_seq = conf->seq_flush+1; | |
3180 | set_bit(STRIPE_BIT_DELAY, &sh->state); | |
3181 | } | |
cbe47ec5 | 3182 | } |
d0852df5 | 3183 | spin_unlock_irq(&sh->stripe_lock); |
59fc630b | 3184 | |
3185 | if (stripe_can_batch(sh)) | |
3186 | stripe_add_to_batch_list(conf, sh); | |
1da177e4 LT |
3187 | return 1; |
3188 | ||
3189 | overlap: | |
3190 | set_bit(R5_Overlap, &sh->dev[dd_idx].flags); | |
b17459c0 | 3191 | spin_unlock_irq(&sh->stripe_lock); |
1da177e4 LT |
3192 | return 0; |
3193 | } | |
3194 | ||
d1688a6d | 3195 | static void end_reshape(struct r5conf *conf); |
29269553 | 3196 | |
d1688a6d | 3197 | static void stripe_set_idx(sector_t stripe, struct r5conf *conf, int previous, |
911d4ee8 | 3198 | struct stripe_head *sh) |
ccfcc3c1 | 3199 | { |
784052ec | 3200 | int sectors_per_chunk = |
09c9e5fa | 3201 | previous ? conf->prev_chunk_sectors : conf->chunk_sectors; |
911d4ee8 | 3202 | int dd_idx; |
2d2063ce | 3203 | int chunk_offset = sector_div(stripe, sectors_per_chunk); |
112bf897 | 3204 | int disks = previous ? conf->previous_raid_disks : conf->raid_disks; |
2d2063ce | 3205 | |
112bf897 N |
3206 | raid5_compute_sector(conf, |
3207 | stripe * (disks - conf->max_degraded) | |
b875e531 | 3208 | *sectors_per_chunk + chunk_offset, |
112bf897 | 3209 | previous, |
911d4ee8 | 3210 | &dd_idx, sh); |
ccfcc3c1 N |
3211 | } |
3212 | ||
a4456856 | 3213 | static void |
d1688a6d | 3214 | handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh, |
a4456856 | 3215 | struct stripe_head_state *s, int disks, |
34a6f80e | 3216 | struct bio_list *return_bi) |
a4456856 DW |
3217 | { |
3218 | int i; | |
59fc630b | 3219 | BUG_ON(sh->batch_head); |
a4456856 DW |
3220 | for (i = disks; i--; ) { |
3221 | struct bio *bi; | |
3222 | int bitmap_end = 0; | |
3223 | ||
3224 | if (test_bit(R5_ReadError, &sh->dev[i].flags)) { | |
3cb03002 | 3225 | struct md_rdev *rdev; |
a4456856 DW |
3226 | rcu_read_lock(); |
3227 | rdev = rcu_dereference(conf->disks[i].rdev); | |
f5b67ae8 N |
3228 | if (rdev && test_bit(In_sync, &rdev->flags) && |
3229 | !test_bit(Faulty, &rdev->flags)) | |
7f0da59b N |
3230 | atomic_inc(&rdev->nr_pending); |
3231 | else | |
3232 | rdev = NULL; | |
a4456856 | 3233 | rcu_read_unlock(); |
7f0da59b N |
3234 | if (rdev) { |
3235 | if (!rdev_set_badblocks( | |
3236 | rdev, | |
3237 | sh->sector, | |
3238 | STRIPE_SECTORS, 0)) | |
3239 | md_error(conf->mddev, rdev); | |
3240 | rdev_dec_pending(rdev, conf->mddev); | |
3241 | } | |
a4456856 | 3242 | } |
b17459c0 | 3243 | spin_lock_irq(&sh->stripe_lock); |
a4456856 DW |
3244 | /* fail all writes first */ |
3245 | bi = sh->dev[i].towrite; | |
3246 | sh->dev[i].towrite = NULL; | |
7a87f434 | 3247 | sh->overwrite_disks = 0; |
b17459c0 | 3248 | spin_unlock_irq(&sh->stripe_lock); |
1ed850f3 | 3249 | if (bi) |
a4456856 | 3250 | bitmap_end = 1; |
a4456856 | 3251 | |
0576b1c6 SL |
3252 | r5l_stripe_write_finished(sh); |
3253 | ||
a4456856 DW |
3254 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) |
3255 | wake_up(&conf->wait_for_overlap); | |
3256 | ||
4f024f37 | 3257 | while (bi && bi->bi_iter.bi_sector < |
a4456856 DW |
3258 | sh->dev[i].sector + STRIPE_SECTORS) { |
3259 | struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector); | |
4246a0b6 CH |
3260 | |
3261 | bi->bi_error = -EIO; | |
e7836bd6 | 3262 | if (!raid5_dec_bi_active_stripes(bi)) { |
a4456856 | 3263 | md_write_end(conf->mddev); |
34a6f80e | 3264 | bio_list_add(return_bi, bi); |
a4456856 DW |
3265 | } |
3266 | bi = nextbi; | |
3267 | } | |
7eaf7e8e SL |
3268 | if (bitmap_end) |
3269 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, | |
3270 | STRIPE_SECTORS, 0, 0); | |
3271 | bitmap_end = 0; | |
a4456856 DW |
3272 | /* and fail all 'written' */ |
3273 | bi = sh->dev[i].written; | |
3274 | sh->dev[i].written = NULL; | |
d592a996 SL |
3275 | if (test_and_clear_bit(R5_SkipCopy, &sh->dev[i].flags)) { |
3276 | WARN_ON(test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
3277 | sh->dev[i].page = sh->dev[i].orig_page; | |
3278 | } | |
3279 | ||
a4456856 | 3280 | if (bi) bitmap_end = 1; |
4f024f37 | 3281 | while (bi && bi->bi_iter.bi_sector < |
a4456856 DW |
3282 | sh->dev[i].sector + STRIPE_SECTORS) { |
3283 | struct bio *bi2 = r5_next_bio(bi, sh->dev[i].sector); | |
4246a0b6 CH |
3284 | |
3285 | bi->bi_error = -EIO; | |
e7836bd6 | 3286 | if (!raid5_dec_bi_active_stripes(bi)) { |
a4456856 | 3287 | md_write_end(conf->mddev); |
34a6f80e | 3288 | bio_list_add(return_bi, bi); |
a4456856 DW |
3289 | } |
3290 | bi = bi2; | |
3291 | } | |
3292 | ||
b5e98d65 DW |
3293 | /* fail any reads if this device is non-operational and |
3294 | * the data has not reached the cache yet. | |
3295 | */ | |
3296 | if (!test_bit(R5_Wantfill, &sh->dev[i].flags) && | |
6e74a9cf | 3297 | s->failed > conf->max_degraded && |
b5e98d65 DW |
3298 | (!test_bit(R5_Insync, &sh->dev[i].flags) || |
3299 | test_bit(R5_ReadError, &sh->dev[i].flags))) { | |
143c4d05 | 3300 | spin_lock_irq(&sh->stripe_lock); |
a4456856 DW |
3301 | bi = sh->dev[i].toread; |
3302 | sh->dev[i].toread = NULL; | |
143c4d05 | 3303 | spin_unlock_irq(&sh->stripe_lock); |
a4456856 DW |
3304 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) |
3305 | wake_up(&conf->wait_for_overlap); | |
ebda780b SL |
3306 | if (bi) |
3307 | s->to_read--; | |
4f024f37 | 3308 | while (bi && bi->bi_iter.bi_sector < |
a4456856 DW |
3309 | sh->dev[i].sector + STRIPE_SECTORS) { |
3310 | struct bio *nextbi = | |
3311 | r5_next_bio(bi, sh->dev[i].sector); | |
4246a0b6 CH |
3312 | |
3313 | bi->bi_error = -EIO; | |
34a6f80e N |
3314 | if (!raid5_dec_bi_active_stripes(bi)) |
3315 | bio_list_add(return_bi, bi); | |
a4456856 DW |
3316 | bi = nextbi; |
3317 | } | |
3318 | } | |
a4456856 DW |
3319 | if (bitmap_end) |
3320 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, | |
3321 | STRIPE_SECTORS, 0, 0); | |
8cfa7b0f N |
3322 | /* If we were in the middle of a write the parity block might |
3323 | * still be locked - so just clear all R5_LOCKED flags | |
3324 | */ | |
3325 | clear_bit(R5_LOCKED, &sh->dev[i].flags); | |
a4456856 | 3326 | } |
ebda780b SL |
3327 | s->to_write = 0; |
3328 | s->written = 0; | |
a4456856 | 3329 | |
8b3e6cdc DW |
3330 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) |
3331 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
3332 | md_wakeup_thread(conf->mddev->thread); | |
a4456856 DW |
3333 | } |
3334 | ||
7f0da59b | 3335 | static void |
d1688a6d | 3336 | handle_failed_sync(struct r5conf *conf, struct stripe_head *sh, |
7f0da59b N |
3337 | struct stripe_head_state *s) |
3338 | { | |
3339 | int abort = 0; | |
3340 | int i; | |
3341 | ||
59fc630b | 3342 | BUG_ON(sh->batch_head); |
7f0da59b | 3343 | clear_bit(STRIPE_SYNCING, &sh->state); |
f8dfcffd N |
3344 | if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags)) |
3345 | wake_up(&conf->wait_for_overlap); | |
7f0da59b | 3346 | s->syncing = 0; |
9a3e1101 | 3347 | s->replacing = 0; |
7f0da59b | 3348 | /* There is nothing more to do for sync/check/repair. |
18b9837e N |
3349 | * Don't even need to abort as that is handled elsewhere |
3350 | * if needed, and not always wanted e.g. if there is a known | |
3351 | * bad block here. | |
9a3e1101 | 3352 | * For recover/replace we need to record a bad block on all |
7f0da59b N |
3353 | * non-sync devices, or abort the recovery |
3354 | */ | |
18b9837e N |
3355 | if (test_bit(MD_RECOVERY_RECOVER, &conf->mddev->recovery)) { |
3356 | /* During recovery devices cannot be removed, so | |
3357 | * locking and refcounting of rdevs is not needed | |
3358 | */ | |
e50d3992 | 3359 | rcu_read_lock(); |
18b9837e | 3360 | for (i = 0; i < conf->raid_disks; i++) { |
e50d3992 | 3361 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); |
18b9837e N |
3362 | if (rdev |
3363 | && !test_bit(Faulty, &rdev->flags) | |
3364 | && !test_bit(In_sync, &rdev->flags) | |
3365 | && !rdev_set_badblocks(rdev, sh->sector, | |
3366 | STRIPE_SECTORS, 0)) | |
3367 | abort = 1; | |
e50d3992 | 3368 | rdev = rcu_dereference(conf->disks[i].replacement); |
18b9837e N |
3369 | if (rdev |
3370 | && !test_bit(Faulty, &rdev->flags) | |
3371 | && !test_bit(In_sync, &rdev->flags) | |
3372 | && !rdev_set_badblocks(rdev, sh->sector, | |
3373 | STRIPE_SECTORS, 0)) | |
3374 | abort = 1; | |
3375 | } | |
e50d3992 | 3376 | rcu_read_unlock(); |
18b9837e N |
3377 | if (abort) |
3378 | conf->recovery_disabled = | |
3379 | conf->mddev->recovery_disabled; | |
7f0da59b | 3380 | } |
18b9837e | 3381 | md_done_sync(conf->mddev, STRIPE_SECTORS, !abort); |
7f0da59b N |
3382 | } |
3383 | ||
9a3e1101 N |
3384 | static int want_replace(struct stripe_head *sh, int disk_idx) |
3385 | { | |
3386 | struct md_rdev *rdev; | |
3387 | int rv = 0; | |
3f232d6a N |
3388 | |
3389 | rcu_read_lock(); | |
3390 | rdev = rcu_dereference(sh->raid_conf->disks[disk_idx].replacement); | |
9a3e1101 N |
3391 | if (rdev |
3392 | && !test_bit(Faulty, &rdev->flags) | |
3393 | && !test_bit(In_sync, &rdev->flags) | |
3394 | && (rdev->recovery_offset <= sh->sector | |
3395 | || rdev->mddev->recovery_cp <= sh->sector)) | |
3396 | rv = 1; | |
3f232d6a | 3397 | rcu_read_unlock(); |
9a3e1101 N |
3398 | return rv; |
3399 | } | |
3400 | ||
2c58f06e N |
3401 | static int need_this_block(struct stripe_head *sh, struct stripe_head_state *s, |
3402 | int disk_idx, int disks) | |
a4456856 | 3403 | { |
5599becc | 3404 | struct r5dev *dev = &sh->dev[disk_idx]; |
f2b3b44d N |
3405 | struct r5dev *fdev[2] = { &sh->dev[s->failed_num[0]], |
3406 | &sh->dev[s->failed_num[1]] }; | |
ea664c82 | 3407 | int i; |
5599becc | 3408 | |
a79cfe12 N |
3409 | |
3410 | if (test_bit(R5_LOCKED, &dev->flags) || | |
3411 | test_bit(R5_UPTODATE, &dev->flags)) | |
3412 | /* No point reading this as we already have it or have | |
3413 | * decided to get it. | |
3414 | */ | |
3415 | return 0; | |
3416 | ||
3417 | if (dev->toread || | |
3418 | (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags))) | |
3419 | /* We need this block to directly satisfy a request */ | |
3420 | return 1; | |
3421 | ||
3422 | if (s->syncing || s->expanding || | |
3423 | (s->replacing && want_replace(sh, disk_idx))) | |
3424 | /* When syncing, or expanding we read everything. | |
3425 | * When replacing, we need the replaced block. | |
3426 | */ | |
3427 | return 1; | |
3428 | ||
3429 | if ((s->failed >= 1 && fdev[0]->toread) || | |
3430 | (s->failed >= 2 && fdev[1]->toread)) | |
3431 | /* If we want to read from a failed device, then | |
3432 | * we need to actually read every other device. | |
3433 | */ | |
3434 | return 1; | |
3435 | ||
a9d56950 N |
3436 | /* Sometimes neither read-modify-write nor reconstruct-write |
3437 | * cycles can work. In those cases we read every block we | |
3438 | * can. Then the parity-update is certain to have enough to | |
3439 | * work with. | |
3440 | * This can only be a problem when we need to write something, | |
3441 | * and some device has failed. If either of those tests | |
3442 | * fail we need look no further. | |
3443 | */ | |
3444 | if (!s->failed || !s->to_write) | |
3445 | return 0; | |
3446 | ||
3447 | if (test_bit(R5_Insync, &dev->flags) && | |
3448 | !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
3449 | /* Pre-reads at not permitted until after short delay | |
3450 | * to gather multiple requests. However if this | |
3451 | * device is no Insync, the block could only be be computed | |
3452 | * and there is no need to delay that. | |
3453 | */ | |
3454 | return 0; | |
ea664c82 | 3455 | |
36707bb2 | 3456 | for (i = 0; i < s->failed && i < 2; i++) { |
ea664c82 N |
3457 | if (fdev[i]->towrite && |
3458 | !test_bit(R5_UPTODATE, &fdev[i]->flags) && | |
3459 | !test_bit(R5_OVERWRITE, &fdev[i]->flags)) | |
3460 | /* If we have a partial write to a failed | |
3461 | * device, then we will need to reconstruct | |
3462 | * the content of that device, so all other | |
3463 | * devices must be read. | |
3464 | */ | |
3465 | return 1; | |
3466 | } | |
3467 | ||
3468 | /* If we are forced to do a reconstruct-write, either because | |
3469 | * the current RAID6 implementation only supports that, or | |
3470 | * or because parity cannot be trusted and we are currently | |
3471 | * recovering it, there is extra need to be careful. | |
3472 | * If one of the devices that we would need to read, because | |
3473 | * it is not being overwritten (and maybe not written at all) | |
3474 | * is missing/faulty, then we need to read everything we can. | |
3475 | */ | |
3476 | if (sh->raid_conf->level != 6 && | |
3477 | sh->sector < sh->raid_conf->mddev->recovery_cp) | |
3478 | /* reconstruct-write isn't being forced */ | |
3479 | return 0; | |
36707bb2 | 3480 | for (i = 0; i < s->failed && i < 2; i++) { |
10d82c5f N |
3481 | if (s->failed_num[i] != sh->pd_idx && |
3482 | s->failed_num[i] != sh->qd_idx && | |
3483 | !test_bit(R5_UPTODATE, &fdev[i]->flags) && | |
ea664c82 N |
3484 | !test_bit(R5_OVERWRITE, &fdev[i]->flags)) |
3485 | return 1; | |
3486 | } | |
3487 | ||
2c58f06e N |
3488 | return 0; |
3489 | } | |
3490 | ||
ba02684d SL |
3491 | /* fetch_block - checks the given member device to see if its data needs |
3492 | * to be read or computed to satisfy a request. | |
3493 | * | |
3494 | * Returns 1 when no more member devices need to be checked, otherwise returns | |
3495 | * 0 to tell the loop in handle_stripe_fill to continue | |
3496 | */ | |
2c58f06e N |
3497 | static int fetch_block(struct stripe_head *sh, struct stripe_head_state *s, |
3498 | int disk_idx, int disks) | |
3499 | { | |
3500 | struct r5dev *dev = &sh->dev[disk_idx]; | |
3501 | ||
3502 | /* is the data in this block needed, and can we get it? */ | |
3503 | if (need_this_block(sh, s, disk_idx, disks)) { | |
5599becc YT |
3504 | /* we would like to get this block, possibly by computing it, |
3505 | * otherwise read it if the backing disk is insync | |
3506 | */ | |
3507 | BUG_ON(test_bit(R5_Wantcompute, &dev->flags)); | |
3508 | BUG_ON(test_bit(R5_Wantread, &dev->flags)); | |
b0c783b3 | 3509 | BUG_ON(sh->batch_head); |
5599becc | 3510 | if ((s->uptodate == disks - 1) && |
f2b3b44d N |
3511 | (s->failed && (disk_idx == s->failed_num[0] || |
3512 | disk_idx == s->failed_num[1]))) { | |
5599becc YT |
3513 | /* have disk failed, and we're requested to fetch it; |
3514 | * do compute it | |
a4456856 | 3515 | */ |
5599becc YT |
3516 | pr_debug("Computing stripe %llu block %d\n", |
3517 | (unsigned long long)sh->sector, disk_idx); | |
3518 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
3519 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
3520 | set_bit(R5_Wantcompute, &dev->flags); | |
3521 | sh->ops.target = disk_idx; | |
3522 | sh->ops.target2 = -1; /* no 2nd target */ | |
3523 | s->req_compute = 1; | |
93b3dbce N |
3524 | /* Careful: from this point on 'uptodate' is in the eye |
3525 | * of raid_run_ops which services 'compute' operations | |
3526 | * before writes. R5_Wantcompute flags a block that will | |
3527 | * be R5_UPTODATE by the time it is needed for a | |
3528 | * subsequent operation. | |
3529 | */ | |
5599becc YT |
3530 | s->uptodate++; |
3531 | return 1; | |
3532 | } else if (s->uptodate == disks-2 && s->failed >= 2) { | |
3533 | /* Computing 2-failure is *very* expensive; only | |
3534 | * do it if failed >= 2 | |
3535 | */ | |
3536 | int other; | |
3537 | for (other = disks; other--; ) { | |
3538 | if (other == disk_idx) | |
3539 | continue; | |
3540 | if (!test_bit(R5_UPTODATE, | |
3541 | &sh->dev[other].flags)) | |
3542 | break; | |
a4456856 | 3543 | } |
5599becc YT |
3544 | BUG_ON(other < 0); |
3545 | pr_debug("Computing stripe %llu blocks %d,%d\n", | |
3546 | (unsigned long long)sh->sector, | |
3547 | disk_idx, other); | |
3548 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
3549 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
3550 | set_bit(R5_Wantcompute, &sh->dev[disk_idx].flags); | |
3551 | set_bit(R5_Wantcompute, &sh->dev[other].flags); | |
3552 | sh->ops.target = disk_idx; | |
3553 | sh->ops.target2 = other; | |
3554 | s->uptodate += 2; | |
3555 | s->req_compute = 1; | |
3556 | return 1; | |
3557 | } else if (test_bit(R5_Insync, &dev->flags)) { | |
3558 | set_bit(R5_LOCKED, &dev->flags); | |
3559 | set_bit(R5_Wantread, &dev->flags); | |
3560 | s->locked++; | |
3561 | pr_debug("Reading block %d (sync=%d)\n", | |
3562 | disk_idx, s->syncing); | |
a4456856 DW |
3563 | } |
3564 | } | |
5599becc YT |
3565 | |
3566 | return 0; | |
3567 | } | |
3568 | ||
3569 | /** | |
93b3dbce | 3570 | * handle_stripe_fill - read or compute data to satisfy pending requests. |
5599becc | 3571 | */ |
93b3dbce N |
3572 | static void handle_stripe_fill(struct stripe_head *sh, |
3573 | struct stripe_head_state *s, | |
3574 | int disks) | |
5599becc YT |
3575 | { |
3576 | int i; | |
3577 | ||
3578 | /* look for blocks to read/compute, skip this if a compute | |
3579 | * is already in flight, or if the stripe contents are in the | |
3580 | * midst of changing due to a write | |
3581 | */ | |
3582 | if (!test_bit(STRIPE_COMPUTE_RUN, &sh->state) && !sh->check_state && | |
07e83364 SL |
3583 | !sh->reconstruct_state) { |
3584 | ||
3585 | /* | |
3586 | * For degraded stripe with data in journal, do not handle | |
3587 | * read requests yet, instead, flush the stripe to raid | |
3588 | * disks first, this avoids handling complex rmw of write | |
3589 | * back cache (prexor with orig_page, and then xor with | |
3590 | * page) in the read path | |
3591 | */ | |
3592 | if (s->injournal && s->failed) { | |
3593 | if (test_bit(STRIPE_R5C_CACHING, &sh->state)) | |
3594 | r5c_make_stripe_write_out(sh); | |
3595 | goto out; | |
3596 | } | |
3597 | ||
5599becc | 3598 | for (i = disks; i--; ) |
93b3dbce | 3599 | if (fetch_block(sh, s, i, disks)) |
5599becc | 3600 | break; |
07e83364 SL |
3601 | } |
3602 | out: | |
a4456856 DW |
3603 | set_bit(STRIPE_HANDLE, &sh->state); |
3604 | } | |
3605 | ||
787b76fa N |
3606 | static void break_stripe_batch_list(struct stripe_head *head_sh, |
3607 | unsigned long handle_flags); | |
1fe797e6 | 3608 | /* handle_stripe_clean_event |
a4456856 DW |
3609 | * any written block on an uptodate or failed drive can be returned. |
3610 | * Note that if we 'wrote' to a failed drive, it will be UPTODATE, but | |
3611 | * never LOCKED, so we don't need to test 'failed' directly. | |
3612 | */ | |
d1688a6d | 3613 | static void handle_stripe_clean_event(struct r5conf *conf, |
34a6f80e | 3614 | struct stripe_head *sh, int disks, struct bio_list *return_bi) |
a4456856 DW |
3615 | { |
3616 | int i; | |
3617 | struct r5dev *dev; | |
f8dfcffd | 3618 | int discard_pending = 0; |
59fc630b | 3619 | struct stripe_head *head_sh = sh; |
3620 | bool do_endio = false; | |
a4456856 DW |
3621 | |
3622 | for (i = disks; i--; ) | |
3623 | if (sh->dev[i].written) { | |
3624 | dev = &sh->dev[i]; | |
3625 | if (!test_bit(R5_LOCKED, &dev->flags) && | |
9e444768 | 3626 | (test_bit(R5_UPTODATE, &dev->flags) || |
d592a996 SL |
3627 | test_bit(R5_Discard, &dev->flags) || |
3628 | test_bit(R5_SkipCopy, &dev->flags))) { | |
a4456856 DW |
3629 | /* We can return any write requests */ |
3630 | struct bio *wbi, *wbi2; | |
45b4233c | 3631 | pr_debug("Return write for disc %d\n", i); |
ca64cae9 N |
3632 | if (test_and_clear_bit(R5_Discard, &dev->flags)) |
3633 | clear_bit(R5_UPTODATE, &dev->flags); | |
d592a996 SL |
3634 | if (test_and_clear_bit(R5_SkipCopy, &dev->flags)) { |
3635 | WARN_ON(test_bit(R5_UPTODATE, &dev->flags)); | |
d592a996 | 3636 | } |
59fc630b | 3637 | do_endio = true; |
3638 | ||
3639 | returnbi: | |
3640 | dev->page = dev->orig_page; | |
a4456856 DW |
3641 | wbi = dev->written; |
3642 | dev->written = NULL; | |
4f024f37 | 3643 | while (wbi && wbi->bi_iter.bi_sector < |
a4456856 DW |
3644 | dev->sector + STRIPE_SECTORS) { |
3645 | wbi2 = r5_next_bio(wbi, dev->sector); | |
e7836bd6 | 3646 | if (!raid5_dec_bi_active_stripes(wbi)) { |
a4456856 | 3647 | md_write_end(conf->mddev); |
34a6f80e | 3648 | bio_list_add(return_bi, wbi); |
a4456856 DW |
3649 | } |
3650 | wbi = wbi2; | |
3651 | } | |
7eaf7e8e SL |
3652 | bitmap_endwrite(conf->mddev->bitmap, sh->sector, |
3653 | STRIPE_SECTORS, | |
a4456856 | 3654 | !test_bit(STRIPE_DEGRADED, &sh->state), |
7eaf7e8e | 3655 | 0); |
59fc630b | 3656 | if (head_sh->batch_head) { |
3657 | sh = list_first_entry(&sh->batch_list, | |
3658 | struct stripe_head, | |
3659 | batch_list); | |
3660 | if (sh != head_sh) { | |
3661 | dev = &sh->dev[i]; | |
3662 | goto returnbi; | |
3663 | } | |
3664 | } | |
3665 | sh = head_sh; | |
3666 | dev = &sh->dev[i]; | |
f8dfcffd N |
3667 | } else if (test_bit(R5_Discard, &dev->flags)) |
3668 | discard_pending = 1; | |
3669 | } | |
f6bed0ef | 3670 | |
0576b1c6 SL |
3671 | r5l_stripe_write_finished(sh); |
3672 | ||
f8dfcffd N |
3673 | if (!discard_pending && |
3674 | test_bit(R5_Discard, &sh->dev[sh->pd_idx].flags)) { | |
b8a9d66d | 3675 | int hash; |
f8dfcffd N |
3676 | clear_bit(R5_Discard, &sh->dev[sh->pd_idx].flags); |
3677 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); | |
3678 | if (sh->qd_idx >= 0) { | |
3679 | clear_bit(R5_Discard, &sh->dev[sh->qd_idx].flags); | |
3680 | clear_bit(R5_UPTODATE, &sh->dev[sh->qd_idx].flags); | |
3681 | } | |
3682 | /* now that discard is done we can proceed with any sync */ | |
3683 | clear_bit(STRIPE_DISCARD, &sh->state); | |
d47648fc SL |
3684 | /* |
3685 | * SCSI discard will change some bio fields and the stripe has | |
3686 | * no updated data, so remove it from hash list and the stripe | |
3687 | * will be reinitialized | |
3688 | */ | |
59fc630b | 3689 | unhash: |
b8a9d66d RG |
3690 | hash = sh->hash_lock_index; |
3691 | spin_lock_irq(conf->hash_locks + hash); | |
d47648fc | 3692 | remove_hash(sh); |
b8a9d66d | 3693 | spin_unlock_irq(conf->hash_locks + hash); |
59fc630b | 3694 | if (head_sh->batch_head) { |
3695 | sh = list_first_entry(&sh->batch_list, | |
3696 | struct stripe_head, batch_list); | |
3697 | if (sh != head_sh) | |
3698 | goto unhash; | |
3699 | } | |
59fc630b | 3700 | sh = head_sh; |
3701 | ||
f8dfcffd N |
3702 | if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state)) |
3703 | set_bit(STRIPE_HANDLE, &sh->state); | |
3704 | ||
3705 | } | |
8b3e6cdc DW |
3706 | |
3707 | if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) | |
3708 | if (atomic_dec_and_test(&conf->pending_full_writes)) | |
3709 | md_wakeup_thread(conf->mddev->thread); | |
59fc630b | 3710 | |
787b76fa N |
3711 | if (head_sh->batch_head && do_endio) |
3712 | break_stripe_batch_list(head_sh, STRIPE_EXPAND_SYNC_FLAGS); | |
a4456856 DW |
3713 | } |
3714 | ||
86aa1397 SL |
3715 | /* |
3716 | * For RMW in write back cache, we need extra page in prexor to store the | |
3717 | * old data. This page is stored in dev->orig_page. | |
3718 | * | |
3719 | * This function checks whether we have data for prexor. The exact logic | |
3720 | * is: | |
3721 | * R5_UPTODATE && (!R5_InJournal || R5_OrigPageUPTDODATE) | |
3722 | */ | |
3723 | static inline bool uptodate_for_rmw(struct r5dev *dev) | |
3724 | { | |
3725 | return (test_bit(R5_UPTODATE, &dev->flags)) && | |
3726 | (!test_bit(R5_InJournal, &dev->flags) || | |
3727 | test_bit(R5_OrigPageUPTDODATE, &dev->flags)); | |
3728 | } | |
3729 | ||
d7bd398e SL |
3730 | static int handle_stripe_dirtying(struct r5conf *conf, |
3731 | struct stripe_head *sh, | |
3732 | struct stripe_head_state *s, | |
3733 | int disks) | |
a4456856 DW |
3734 | { |
3735 | int rmw = 0, rcw = 0, i; | |
a7854487 AL |
3736 | sector_t recovery_cp = conf->mddev->recovery_cp; |
3737 | ||
584acdd4 | 3738 | /* Check whether resync is now happening or should start. |
a7854487 AL |
3739 | * If yes, then the array is dirty (after unclean shutdown or |
3740 | * initial creation), so parity in some stripes might be inconsistent. | |
3741 | * In this case, we need to always do reconstruct-write, to ensure | |
3742 | * that in case of drive failure or read-error correction, we | |
3743 | * generate correct data from the parity. | |
3744 | */ | |
584acdd4 | 3745 | if (conf->rmw_level == PARITY_DISABLE_RMW || |
26ac1073 N |
3746 | (recovery_cp < MaxSector && sh->sector >= recovery_cp && |
3747 | s->failed == 0)) { | |
a7854487 | 3748 | /* Calculate the real rcw later - for now make it |
c8ac1803 N |
3749 | * look like rcw is cheaper |
3750 | */ | |
3751 | rcw = 1; rmw = 2; | |
584acdd4 MS |
3752 | pr_debug("force RCW rmw_level=%u, recovery_cp=%llu sh->sector=%llu\n", |
3753 | conf->rmw_level, (unsigned long long)recovery_cp, | |
a7854487 | 3754 | (unsigned long long)sh->sector); |
c8ac1803 | 3755 | } else for (i = disks; i--; ) { |
a4456856 DW |
3756 | /* would I have to read this buffer for read_modify_write */ |
3757 | struct r5dev *dev = &sh->dev[i]; | |
39b99586 | 3758 | if (((dev->towrite && !delay_towrite(conf, dev, s)) || |
07e83364 | 3759 | i == sh->pd_idx || i == sh->qd_idx || |
1e6d690b | 3760 | test_bit(R5_InJournal, &dev->flags)) && |
a4456856 | 3761 | !test_bit(R5_LOCKED, &dev->flags) && |
86aa1397 | 3762 | !(uptodate_for_rmw(dev) || |
f38e1219 | 3763 | test_bit(R5_Wantcompute, &dev->flags))) { |
a4456856 DW |
3764 | if (test_bit(R5_Insync, &dev->flags)) |
3765 | rmw++; | |
3766 | else | |
3767 | rmw += 2*disks; /* cannot read it */ | |
3768 | } | |
3769 | /* Would I have to read this buffer for reconstruct_write */ | |
584acdd4 MS |
3770 | if (!test_bit(R5_OVERWRITE, &dev->flags) && |
3771 | i != sh->pd_idx && i != sh->qd_idx && | |
a4456856 | 3772 | !test_bit(R5_LOCKED, &dev->flags) && |
f38e1219 | 3773 | !(test_bit(R5_UPTODATE, &dev->flags) || |
1e6d690b | 3774 | test_bit(R5_Wantcompute, &dev->flags))) { |
67f45548 N |
3775 | if (test_bit(R5_Insync, &dev->flags)) |
3776 | rcw++; | |
a4456856 DW |
3777 | else |
3778 | rcw += 2*disks; | |
3779 | } | |
3780 | } | |
1e6d690b | 3781 | |
39b99586 SL |
3782 | pr_debug("for sector %llu state 0x%lx, rmw=%d rcw=%d\n", |
3783 | (unsigned long long)sh->sector, sh->state, rmw, rcw); | |
a4456856 | 3784 | set_bit(STRIPE_HANDLE, &sh->state); |
41257580 | 3785 | if ((rmw < rcw || (rmw == rcw && conf->rmw_level == PARITY_PREFER_RMW)) && rmw > 0) { |
a4456856 | 3786 | /* prefer read-modify-write, but need to get some data */ |
e3620a3a JB |
3787 | if (conf->mddev->queue) |
3788 | blk_add_trace_msg(conf->mddev->queue, | |
3789 | "raid5 rmw %llu %d", | |
3790 | (unsigned long long)sh->sector, rmw); | |
a4456856 DW |
3791 | for (i = disks; i--; ) { |
3792 | struct r5dev *dev = &sh->dev[i]; | |
1e6d690b SL |
3793 | if (test_bit(R5_InJournal, &dev->flags) && |
3794 | dev->page == dev->orig_page && | |
3795 | !test_bit(R5_LOCKED, &sh->dev[sh->pd_idx].flags)) { | |
3796 | /* alloc page for prexor */ | |
d7bd398e SL |
3797 | struct page *p = alloc_page(GFP_NOIO); |
3798 | ||
3799 | if (p) { | |
3800 | dev->orig_page = p; | |
3801 | continue; | |
3802 | } | |
3803 | ||
3804 | /* | |
3805 | * alloc_page() failed, try use | |
3806 | * disk_info->extra_page | |
3807 | */ | |
3808 | if (!test_and_set_bit(R5C_EXTRA_PAGE_IN_USE, | |
3809 | &conf->cache_state)) { | |
3810 | r5c_use_extra_page(sh); | |
3811 | break; | |
3812 | } | |
1e6d690b | 3813 | |
d7bd398e SL |
3814 | /* extra_page in use, add to delayed_list */ |
3815 | set_bit(STRIPE_DELAYED, &sh->state); | |
3816 | s->waiting_extra_page = 1; | |
3817 | return -EAGAIN; | |
1e6d690b | 3818 | } |
d7bd398e | 3819 | } |
1e6d690b | 3820 | |
d7bd398e SL |
3821 | for (i = disks; i--; ) { |
3822 | struct r5dev *dev = &sh->dev[i]; | |
39b99586 | 3823 | if (((dev->towrite && !delay_towrite(conf, dev, s)) || |
1e6d690b SL |
3824 | i == sh->pd_idx || i == sh->qd_idx || |
3825 | test_bit(R5_InJournal, &dev->flags)) && | |
a4456856 | 3826 | !test_bit(R5_LOCKED, &dev->flags) && |
86aa1397 | 3827 | !(uptodate_for_rmw(dev) || |
1e6d690b | 3828 | test_bit(R5_Wantcompute, &dev->flags)) && |
a4456856 | 3829 | test_bit(R5_Insync, &dev->flags)) { |
67f45548 N |
3830 | if (test_bit(STRIPE_PREREAD_ACTIVE, |
3831 | &sh->state)) { | |
3832 | pr_debug("Read_old block %d for r-m-w\n", | |
3833 | i); | |
a4456856 DW |
3834 | set_bit(R5_LOCKED, &dev->flags); |
3835 | set_bit(R5_Wantread, &dev->flags); | |
3836 | s->locked++; | |
3837 | } else { | |
3838 | set_bit(STRIPE_DELAYED, &sh->state); | |
3839 | set_bit(STRIPE_HANDLE, &sh->state); | |
3840 | } | |
3841 | } | |
3842 | } | |
a9add5d9 | 3843 | } |
41257580 | 3844 | if ((rcw < rmw || (rcw == rmw && conf->rmw_level != PARITY_PREFER_RMW)) && rcw > 0) { |
a4456856 | 3845 | /* want reconstruct write, but need to get some data */ |
a9add5d9 | 3846 | int qread =0; |
c8ac1803 | 3847 | rcw = 0; |
a4456856 DW |
3848 | for (i = disks; i--; ) { |
3849 | struct r5dev *dev = &sh->dev[i]; | |
3850 | if (!test_bit(R5_OVERWRITE, &dev->flags) && | |
c8ac1803 | 3851 | i != sh->pd_idx && i != sh->qd_idx && |
a4456856 | 3852 | !test_bit(R5_LOCKED, &dev->flags) && |
f38e1219 | 3853 | !(test_bit(R5_UPTODATE, &dev->flags) || |
c8ac1803 N |
3854 | test_bit(R5_Wantcompute, &dev->flags))) { |
3855 | rcw++; | |
67f45548 N |
3856 | if (test_bit(R5_Insync, &dev->flags) && |
3857 | test_bit(STRIPE_PREREAD_ACTIVE, | |
3858 | &sh->state)) { | |
45b4233c | 3859 | pr_debug("Read_old block " |
a4456856 DW |
3860 | "%d for Reconstruct\n", i); |
3861 | set_bit(R5_LOCKED, &dev->flags); | |
3862 | set_bit(R5_Wantread, &dev->flags); | |
3863 | s->locked++; | |
a9add5d9 | 3864 | qread++; |
a4456856 DW |
3865 | } else { |
3866 | set_bit(STRIPE_DELAYED, &sh->state); | |
3867 | set_bit(STRIPE_HANDLE, &sh->state); | |
3868 | } | |
3869 | } | |
3870 | } | |
e3620a3a | 3871 | if (rcw && conf->mddev->queue) |
a9add5d9 N |
3872 | blk_add_trace_msg(conf->mddev->queue, "raid5 rcw %llu %d %d %d", |
3873 | (unsigned long long)sh->sector, | |
3874 | rcw, qread, test_bit(STRIPE_DELAYED, &sh->state)); | |
c8ac1803 | 3875 | } |
b1b02fe9 N |
3876 | |
3877 | if (rcw > disks && rmw > disks && | |
3878 | !test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
3879 | set_bit(STRIPE_DELAYED, &sh->state); | |
3880 | ||
a4456856 DW |
3881 | /* now if nothing is locked, and if we have enough data, |
3882 | * we can start a write request | |
3883 | */ | |
f38e1219 DW |
3884 | /* since handle_stripe can be called at any time we need to handle the |
3885 | * case where a compute block operation has been submitted and then a | |
ac6b53b6 DW |
3886 | * subsequent call wants to start a write request. raid_run_ops only |
3887 | * handles the case where compute block and reconstruct are requested | |
f38e1219 DW |
3888 | * simultaneously. If this is not the case then new writes need to be |
3889 | * held off until the compute completes. | |
3890 | */ | |
976ea8d4 DW |
3891 | if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) && |
3892 | (s->locked == 0 && (rcw == 0 || rmw == 0) && | |
1e6d690b | 3893 | !test_bit(STRIPE_BIT_DELAY, &sh->state))) |
c0f7bddb | 3894 | schedule_reconstruction(sh, s, rcw == 0, 0); |
d7bd398e | 3895 | return 0; |
a4456856 DW |
3896 | } |
3897 | ||
d1688a6d | 3898 | static void handle_parity_checks5(struct r5conf *conf, struct stripe_head *sh, |
a4456856 DW |
3899 | struct stripe_head_state *s, int disks) |
3900 | { | |
ecc65c9b | 3901 | struct r5dev *dev = NULL; |
bd2ab670 | 3902 | |
59fc630b | 3903 | BUG_ON(sh->batch_head); |
a4456856 | 3904 | set_bit(STRIPE_HANDLE, &sh->state); |
e89f8962 | 3905 | |
ecc65c9b DW |
3906 | switch (sh->check_state) { |
3907 | case check_state_idle: | |
3908 | /* start a new check operation if there are no failures */ | |
bd2ab670 | 3909 | if (s->failed == 0) { |
bd2ab670 | 3910 | BUG_ON(s->uptodate != disks); |
ecc65c9b DW |
3911 | sh->check_state = check_state_run; |
3912 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
bd2ab670 | 3913 | clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); |
bd2ab670 | 3914 | s->uptodate--; |
ecc65c9b | 3915 | break; |
bd2ab670 | 3916 | } |
f2b3b44d | 3917 | dev = &sh->dev[s->failed_num[0]]; |
ecc65c9b DW |
3918 | /* fall through */ |
3919 | case check_state_compute_result: | |
3920 | sh->check_state = check_state_idle; | |
3921 | if (!dev) | |
3922 | dev = &sh->dev[sh->pd_idx]; | |
3923 | ||
3924 | /* check that a write has not made the stripe insync */ | |
3925 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
3926 | break; | |
c8894419 | 3927 | |
a4456856 | 3928 | /* either failed parity check, or recovery is happening */ |
a4456856 DW |
3929 | BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)); |
3930 | BUG_ON(s->uptodate != disks); | |
3931 | ||
3932 | set_bit(R5_LOCKED, &dev->flags); | |
ecc65c9b | 3933 | s->locked++; |
a4456856 | 3934 | set_bit(R5_Wantwrite, &dev->flags); |
830ea016 | 3935 | |
a4456856 | 3936 | clear_bit(STRIPE_DEGRADED, &sh->state); |
a4456856 | 3937 | set_bit(STRIPE_INSYNC, &sh->state); |
ecc65c9b DW |
3938 | break; |
3939 | case check_state_run: | |
3940 | break; /* we will be called again upon completion */ | |
3941 | case check_state_check_result: | |
3942 | sh->check_state = check_state_idle; | |
3943 | ||
3944 | /* if a failure occurred during the check operation, leave | |
3945 | * STRIPE_INSYNC not set and let the stripe be handled again | |
3946 | */ | |
3947 | if (s->failed) | |
3948 | break; | |
3949 | ||
3950 | /* handle a successful check operation, if parity is correct | |
3951 | * we are done. Otherwise update the mismatch count and repair | |
3952 | * parity if !MD_RECOVERY_CHECK | |
3953 | */ | |
ad283ea4 | 3954 | if ((sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) == 0) |
ecc65c9b DW |
3955 | /* parity is correct (on disc, |
3956 | * not in buffer any more) | |
3957 | */ | |
3958 | set_bit(STRIPE_INSYNC, &sh->state); | |
3959 | else { | |
7f7583d4 | 3960 | atomic64_add(STRIPE_SECTORS, &conf->mddev->resync_mismatches); |
ecc65c9b DW |
3961 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) |
3962 | /* don't try to repair!! */ | |
3963 | set_bit(STRIPE_INSYNC, &sh->state); | |
3964 | else { | |
3965 | sh->check_state = check_state_compute_run; | |
976ea8d4 | 3966 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); |
ecc65c9b DW |
3967 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); |
3968 | set_bit(R5_Wantcompute, | |
3969 | &sh->dev[sh->pd_idx].flags); | |
3970 | sh->ops.target = sh->pd_idx; | |
ac6b53b6 | 3971 | sh->ops.target2 = -1; |
ecc65c9b DW |
3972 | s->uptodate++; |
3973 | } | |
3974 | } | |
3975 | break; | |
3976 | case check_state_compute_run: | |
3977 | break; | |
3978 | default: | |
cc6167b4 | 3979 | pr_err("%s: unknown check_state: %d sector: %llu\n", |
ecc65c9b DW |
3980 | __func__, sh->check_state, |
3981 | (unsigned long long) sh->sector); | |
3982 | BUG(); | |
a4456856 DW |
3983 | } |
3984 | } | |
3985 | ||
d1688a6d | 3986 | static void handle_parity_checks6(struct r5conf *conf, struct stripe_head *sh, |
36d1c647 | 3987 | struct stripe_head_state *s, |
f2b3b44d | 3988 | int disks) |
a4456856 | 3989 | { |
a4456856 | 3990 | int pd_idx = sh->pd_idx; |
34e04e87 | 3991 | int qd_idx = sh->qd_idx; |
d82dfee0 | 3992 | struct r5dev *dev; |
a4456856 | 3993 | |
59fc630b | 3994 | BUG_ON(sh->batch_head); |
a4456856 DW |
3995 | set_bit(STRIPE_HANDLE, &sh->state); |
3996 | ||
3997 | BUG_ON(s->failed > 2); | |
d82dfee0 | 3998 | |
a4456856 DW |
3999 | /* Want to check and possibly repair P and Q. |
4000 | * However there could be one 'failed' device, in which | |
4001 | * case we can only check one of them, possibly using the | |
4002 | * other to generate missing data | |
4003 | */ | |
4004 | ||
d82dfee0 DW |
4005 | switch (sh->check_state) { |
4006 | case check_state_idle: | |
4007 | /* start a new check operation if there are < 2 failures */ | |
f2b3b44d | 4008 | if (s->failed == s->q_failed) { |
d82dfee0 | 4009 | /* The only possible failed device holds Q, so it |
a4456856 DW |
4010 | * makes sense to check P (If anything else were failed, |
4011 | * we would have used P to recreate it). | |
4012 | */ | |
d82dfee0 | 4013 | sh->check_state = check_state_run; |
a4456856 | 4014 | } |
f2b3b44d | 4015 | if (!s->q_failed && s->failed < 2) { |
d82dfee0 | 4016 | /* Q is not failed, and we didn't use it to generate |
a4456856 DW |
4017 | * anything, so it makes sense to check it |
4018 | */ | |
d82dfee0 DW |
4019 | if (sh->check_state == check_state_run) |
4020 | sh->check_state = check_state_run_pq; | |
4021 | else | |
4022 | sh->check_state = check_state_run_q; | |
a4456856 | 4023 | } |
a4456856 | 4024 | |
d82dfee0 DW |
4025 | /* discard potentially stale zero_sum_result */ |
4026 | sh->ops.zero_sum_result = 0; | |
a4456856 | 4027 | |
d82dfee0 DW |
4028 | if (sh->check_state == check_state_run) { |
4029 | /* async_xor_zero_sum destroys the contents of P */ | |
4030 | clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); | |
4031 | s->uptodate--; | |
a4456856 | 4032 | } |
d82dfee0 DW |
4033 | if (sh->check_state >= check_state_run && |
4034 | sh->check_state <= check_state_run_pq) { | |
4035 | /* async_syndrome_zero_sum preserves P and Q, so | |
4036 | * no need to mark them !uptodate here | |
4037 | */ | |
4038 | set_bit(STRIPE_OP_CHECK, &s->ops_request); | |
4039 | break; | |
a4456856 DW |
4040 | } |
4041 | ||
d82dfee0 DW |
4042 | /* we have 2-disk failure */ |
4043 | BUG_ON(s->failed != 2); | |
4044 | /* fall through */ | |
4045 | case check_state_compute_result: | |
4046 | sh->check_state = check_state_idle; | |
a4456856 | 4047 | |
d82dfee0 DW |
4048 | /* check that a write has not made the stripe insync */ |
4049 | if (test_bit(STRIPE_INSYNC, &sh->state)) | |
4050 | break; | |
a4456856 DW |
4051 | |
4052 | /* now write out any block on a failed drive, | |
d82dfee0 | 4053 | * or P or Q if they were recomputed |
a4456856 | 4054 | */ |
d82dfee0 | 4055 | BUG_ON(s->uptodate < disks - 1); /* We don't need Q to recover */ |
a4456856 | 4056 | if (s->failed == 2) { |
f2b3b44d | 4057 | dev = &sh->dev[s->failed_num[1]]; |
a4456856 DW |
4058 | s->locked++; |
4059 | set_bit(R5_LOCKED, &dev->flags); | |
4060 | set_bit(R5_Wantwrite, &dev->flags); | |
4061 | } | |
4062 | if (s->failed >= 1) { | |
f2b3b44d | 4063 | dev = &sh->dev[s->failed_num[0]]; |
a4456856 DW |
4064 | s->locked++; |
4065 | set_bit(R5_LOCKED, &dev->flags); | |
4066 | set_bit(R5_Wantwrite, &dev->flags); | |
4067 | } | |
d82dfee0 | 4068 | if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { |
a4456856 DW |
4069 | dev = &sh->dev[pd_idx]; |
4070 | s->locked++; | |
4071 | set_bit(R5_LOCKED, &dev->flags); | |
4072 | set_bit(R5_Wantwrite, &dev->flags); | |
4073 | } | |
d82dfee0 | 4074 | if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { |
a4456856 DW |
4075 | dev = &sh->dev[qd_idx]; |
4076 | s->locked++; | |
4077 | set_bit(R5_LOCKED, &dev->flags); | |
4078 | set_bit(R5_Wantwrite, &dev->flags); | |
4079 | } | |
4080 | clear_bit(STRIPE_DEGRADED, &sh->state); | |
4081 | ||
4082 | set_bit(STRIPE_INSYNC, &sh->state); | |
d82dfee0 DW |
4083 | break; |
4084 | case check_state_run: | |
4085 | case check_state_run_q: | |
4086 | case check_state_run_pq: | |
4087 | break; /* we will be called again upon completion */ | |
4088 | case check_state_check_result: | |
4089 | sh->check_state = check_state_idle; | |
4090 | ||
4091 | /* handle a successful check operation, if parity is correct | |
4092 | * we are done. Otherwise update the mismatch count and repair | |
4093 | * parity if !MD_RECOVERY_CHECK | |
4094 | */ | |
4095 | if (sh->ops.zero_sum_result == 0) { | |
4096 | /* both parities are correct */ | |
4097 | if (!s->failed) | |
4098 | set_bit(STRIPE_INSYNC, &sh->state); | |
4099 | else { | |
4100 | /* in contrast to the raid5 case we can validate | |
4101 | * parity, but still have a failure to write | |
4102 | * back | |
4103 | */ | |
4104 | sh->check_state = check_state_compute_result; | |
4105 | /* Returning at this point means that we may go | |
4106 | * off and bring p and/or q uptodate again so | |
4107 | * we make sure to check zero_sum_result again | |
4108 | * to verify if p or q need writeback | |
4109 | */ | |
4110 | } | |
4111 | } else { | |
7f7583d4 | 4112 | atomic64_add(STRIPE_SECTORS, &conf->mddev->resync_mismatches); |
d82dfee0 DW |
4113 | if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) |
4114 | /* don't try to repair!! */ | |
4115 | set_bit(STRIPE_INSYNC, &sh->state); | |
4116 | else { | |
4117 | int *target = &sh->ops.target; | |
4118 | ||
4119 | sh->ops.target = -1; | |
4120 | sh->ops.target2 = -1; | |
4121 | sh->check_state = check_state_compute_run; | |
4122 | set_bit(STRIPE_COMPUTE_RUN, &sh->state); | |
4123 | set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); | |
4124 | if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { | |
4125 | set_bit(R5_Wantcompute, | |
4126 | &sh->dev[pd_idx].flags); | |
4127 | *target = pd_idx; | |
4128 | target = &sh->ops.target2; | |
4129 | s->uptodate++; | |
4130 | } | |
4131 | if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { | |
4132 | set_bit(R5_Wantcompute, | |
4133 | &sh->dev[qd_idx].flags); | |
4134 | *target = qd_idx; | |
4135 | s->uptodate++; | |
4136 | } | |
4137 | } | |
4138 | } | |
4139 | break; | |
4140 | case check_state_compute_run: | |
4141 | break; | |
4142 | default: | |
cc6167b4 N |
4143 | pr_warn("%s: unknown check_state: %d sector: %llu\n", |
4144 | __func__, sh->check_state, | |
4145 | (unsigned long long) sh->sector); | |
d82dfee0 | 4146 | BUG(); |
a4456856 DW |
4147 | } |
4148 | } | |
4149 | ||
d1688a6d | 4150 | static void handle_stripe_expansion(struct r5conf *conf, struct stripe_head *sh) |
a4456856 DW |
4151 | { |
4152 | int i; | |
4153 | ||
4154 | /* We have read all the blocks in this stripe and now we need to | |
4155 | * copy some of them into a target stripe for expand. | |
4156 | */ | |
f0a50d37 | 4157 | struct dma_async_tx_descriptor *tx = NULL; |
59fc630b | 4158 | BUG_ON(sh->batch_head); |
a4456856 DW |
4159 | clear_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
4160 | for (i = 0; i < sh->disks; i++) | |
34e04e87 | 4161 | if (i != sh->pd_idx && i != sh->qd_idx) { |
911d4ee8 | 4162 | int dd_idx, j; |
a4456856 | 4163 | struct stripe_head *sh2; |
a08abd8c | 4164 | struct async_submit_ctl submit; |
a4456856 | 4165 | |
6d036f7d | 4166 | sector_t bn = raid5_compute_blocknr(sh, i, 1); |
911d4ee8 N |
4167 | sector_t s = raid5_compute_sector(conf, bn, 0, |
4168 | &dd_idx, NULL); | |
6d036f7d | 4169 | sh2 = raid5_get_active_stripe(conf, s, 0, 1, 1); |
a4456856 DW |
4170 | if (sh2 == NULL) |
4171 | /* so far only the early blocks of this stripe | |
4172 | * have been requested. When later blocks | |
4173 | * get requested, we will try again | |
4174 | */ | |
4175 | continue; | |
4176 | if (!test_bit(STRIPE_EXPANDING, &sh2->state) || | |
4177 | test_bit(R5_Expanded, &sh2->dev[dd_idx].flags)) { | |
4178 | /* must have already done this block */ | |
6d036f7d | 4179 | raid5_release_stripe(sh2); |
a4456856 DW |
4180 | continue; |
4181 | } | |
f0a50d37 DW |
4182 | |
4183 | /* place all the copies on one channel */ | |
a08abd8c | 4184 | init_async_submit(&submit, 0, tx, NULL, NULL, NULL); |
f0a50d37 | 4185 | tx = async_memcpy(sh2->dev[dd_idx].page, |
88ba2aa5 | 4186 | sh->dev[i].page, 0, 0, STRIPE_SIZE, |
a08abd8c | 4187 | &submit); |
f0a50d37 | 4188 | |
a4456856 DW |
4189 | set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); |
4190 | set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); | |
4191 | for (j = 0; j < conf->raid_disks; j++) | |
4192 | if (j != sh2->pd_idx && | |
86c374ba | 4193 | j != sh2->qd_idx && |
a4456856 DW |
4194 | !test_bit(R5_Expanded, &sh2->dev[j].flags)) |
4195 | break; | |
4196 | if (j == conf->raid_disks) { | |
4197 | set_bit(STRIPE_EXPAND_READY, &sh2->state); | |
4198 | set_bit(STRIPE_HANDLE, &sh2->state); | |
4199 | } | |
6d036f7d | 4200 | raid5_release_stripe(sh2); |
f0a50d37 | 4201 | |
a4456856 | 4202 | } |
a2e08551 | 4203 | /* done submitting copies, wait for them to complete */ |
749586b7 | 4204 | async_tx_quiesce(&tx); |
a4456856 | 4205 | } |
1da177e4 LT |
4206 | |
4207 | /* | |
4208 | * handle_stripe - do things to a stripe. | |
4209 | * | |
9a3e1101 N |
4210 | * We lock the stripe by setting STRIPE_ACTIVE and then examine the |
4211 | * state of various bits to see what needs to be done. | |
1da177e4 | 4212 | * Possible results: |
9a3e1101 N |
4213 | * return some read requests which now have data |
4214 | * return some write requests which are safely on storage | |
1da177e4 LT |
4215 | * schedule a read on some buffers |
4216 | * schedule a write of some buffers | |
4217 | * return confirmation of parity correctness | |
4218 | * | |
1da177e4 | 4219 | */ |
a4456856 | 4220 | |
acfe726b | 4221 | static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s) |
1da177e4 | 4222 | { |
d1688a6d | 4223 | struct r5conf *conf = sh->raid_conf; |
f416885e | 4224 | int disks = sh->disks; |
474af965 N |
4225 | struct r5dev *dev; |
4226 | int i; | |
9a3e1101 | 4227 | int do_recovery = 0; |
1da177e4 | 4228 | |
acfe726b N |
4229 | memset(s, 0, sizeof(*s)); |
4230 | ||
dabc4ec6 | 4231 | s->expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state) && !sh->batch_head; |
4232 | s->expanded = test_bit(STRIPE_EXPAND_READY, &sh->state) && !sh->batch_head; | |
acfe726b N |
4233 | s->failed_num[0] = -1; |
4234 | s->failed_num[1] = -1; | |
6e74a9cf | 4235 | s->log_failed = r5l_log_disk_error(conf); |
1da177e4 | 4236 | |
acfe726b | 4237 | /* Now to look around and see what can be done */ |
1da177e4 | 4238 | rcu_read_lock(); |
16a53ecc | 4239 | for (i=disks; i--; ) { |
3cb03002 | 4240 | struct md_rdev *rdev; |
31c176ec N |
4241 | sector_t first_bad; |
4242 | int bad_sectors; | |
4243 | int is_bad = 0; | |
acfe726b | 4244 | |
16a53ecc | 4245 | dev = &sh->dev[i]; |
1da177e4 | 4246 | |
45b4233c | 4247 | pr_debug("check %d: state 0x%lx read %p write %p written %p\n", |
9a3e1101 N |
4248 | i, dev->flags, |
4249 | dev->toread, dev->towrite, dev->written); | |
6c0069c0 YT |
4250 | /* maybe we can reply to a read |
4251 | * | |
4252 | * new wantfill requests are only permitted while | |
4253 | * ops_complete_biofill is guaranteed to be inactive | |
4254 | */ | |
4255 | if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread && | |
4256 | !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) | |
4257 | set_bit(R5_Wantfill, &dev->flags); | |
1da177e4 | 4258 | |
16a53ecc | 4259 | /* now count some things */ |
cc94015a N |
4260 | if (test_bit(R5_LOCKED, &dev->flags)) |
4261 | s->locked++; | |
4262 | if (test_bit(R5_UPTODATE, &dev->flags)) | |
4263 | s->uptodate++; | |
2d6e4ecc | 4264 | if (test_bit(R5_Wantcompute, &dev->flags)) { |
cc94015a N |
4265 | s->compute++; |
4266 | BUG_ON(s->compute > 2); | |
2d6e4ecc | 4267 | } |
1da177e4 | 4268 | |
acfe726b | 4269 | if (test_bit(R5_Wantfill, &dev->flags)) |
cc94015a | 4270 | s->to_fill++; |
acfe726b | 4271 | else if (dev->toread) |
cc94015a | 4272 | s->to_read++; |
16a53ecc | 4273 | if (dev->towrite) { |
cc94015a | 4274 | s->to_write++; |
16a53ecc | 4275 | if (!test_bit(R5_OVERWRITE, &dev->flags)) |
cc94015a | 4276 | s->non_overwrite++; |
16a53ecc | 4277 | } |
a4456856 | 4278 | if (dev->written) |
cc94015a | 4279 | s->written++; |
14a75d3e N |
4280 | /* Prefer to use the replacement for reads, but only |
4281 | * if it is recovered enough and has no bad blocks. | |
4282 | */ | |
4283 | rdev = rcu_dereference(conf->disks[i].replacement); | |
4284 | if (rdev && !test_bit(Faulty, &rdev->flags) && | |
4285 | rdev->recovery_offset >= sh->sector + STRIPE_SECTORS && | |
4286 | !is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
4287 | &first_bad, &bad_sectors)) | |
4288 | set_bit(R5_ReadRepl, &dev->flags); | |
4289 | else { | |
e6030cb0 | 4290 | if (rdev && !test_bit(Faulty, &rdev->flags)) |
9a3e1101 | 4291 | set_bit(R5_NeedReplace, &dev->flags); |
e6030cb0 N |
4292 | else |
4293 | clear_bit(R5_NeedReplace, &dev->flags); | |
14a75d3e N |
4294 | rdev = rcu_dereference(conf->disks[i].rdev); |
4295 | clear_bit(R5_ReadRepl, &dev->flags); | |
4296 | } | |
9283d8c5 N |
4297 | if (rdev && test_bit(Faulty, &rdev->flags)) |
4298 | rdev = NULL; | |
31c176ec N |
4299 | if (rdev) { |
4300 | is_bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS, | |
4301 | &first_bad, &bad_sectors); | |
4302 | if (s->blocked_rdev == NULL | |
4303 | && (test_bit(Blocked, &rdev->flags) | |
4304 | || is_bad < 0)) { | |
4305 | if (is_bad < 0) | |
4306 | set_bit(BlockedBadBlocks, | |
4307 | &rdev->flags); | |
4308 | s->blocked_rdev = rdev; | |
4309 | atomic_inc(&rdev->nr_pending); | |
4310 | } | |
6bfe0b49 | 4311 | } |
415e72d0 N |
4312 | clear_bit(R5_Insync, &dev->flags); |
4313 | if (!rdev) | |
4314 | /* Not in-sync */; | |
31c176ec N |
4315 | else if (is_bad) { |
4316 | /* also not in-sync */ | |
18b9837e N |
4317 | if (!test_bit(WriteErrorSeen, &rdev->flags) && |
4318 | test_bit(R5_UPTODATE, &dev->flags)) { | |
31c176ec N |
4319 | /* treat as in-sync, but with a read error |
4320 | * which we can now try to correct | |
4321 | */ | |
4322 | set_bit(R5_Insync, &dev->flags); | |
4323 | set_bit(R5_ReadError, &dev->flags); | |
4324 | } | |
4325 | } else if (test_bit(In_sync, &rdev->flags)) | |
415e72d0 | 4326 | set_bit(R5_Insync, &dev->flags); |
30d7a483 | 4327 | else if (sh->sector + STRIPE_SECTORS <= rdev->recovery_offset) |
415e72d0 | 4328 | /* in sync if before recovery_offset */ |
30d7a483 N |
4329 | set_bit(R5_Insync, &dev->flags); |
4330 | else if (test_bit(R5_UPTODATE, &dev->flags) && | |
4331 | test_bit(R5_Expanded, &dev->flags)) | |
4332 | /* If we've reshaped into here, we assume it is Insync. | |
4333 | * We will shortly update recovery_offset to make | |
4334 | * it official. | |
4335 | */ | |
4336 | set_bit(R5_Insync, &dev->flags); | |
4337 | ||
1cc03eb9 | 4338 | if (test_bit(R5_WriteError, &dev->flags)) { |
14a75d3e N |
4339 | /* This flag does not apply to '.replacement' |
4340 | * only to .rdev, so make sure to check that*/ | |
4341 | struct md_rdev *rdev2 = rcu_dereference( | |
4342 | conf->disks[i].rdev); | |
4343 | if (rdev2 == rdev) | |
4344 | clear_bit(R5_Insync, &dev->flags); | |
4345 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
bc2607f3 | 4346 | s->handle_bad_blocks = 1; |
14a75d3e | 4347 | atomic_inc(&rdev2->nr_pending); |
bc2607f3 N |
4348 | } else |
4349 | clear_bit(R5_WriteError, &dev->flags); | |
4350 | } | |
1cc03eb9 | 4351 | if (test_bit(R5_MadeGood, &dev->flags)) { |
14a75d3e N |
4352 | /* This flag does not apply to '.replacement' |
4353 | * only to .rdev, so make sure to check that*/ | |
4354 | struct md_rdev *rdev2 = rcu_dereference( | |
4355 | conf->disks[i].rdev); | |
4356 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
b84db560 | 4357 | s->handle_bad_blocks = 1; |
14a75d3e | 4358 | atomic_inc(&rdev2->nr_pending); |
b84db560 N |
4359 | } else |
4360 | clear_bit(R5_MadeGood, &dev->flags); | |
4361 | } | |
977df362 N |
4362 | if (test_bit(R5_MadeGoodRepl, &dev->flags)) { |
4363 | struct md_rdev *rdev2 = rcu_dereference( | |
4364 | conf->disks[i].replacement); | |
4365 | if (rdev2 && !test_bit(Faulty, &rdev2->flags)) { | |
4366 | s->handle_bad_blocks = 1; | |
4367 | atomic_inc(&rdev2->nr_pending); | |
4368 | } else | |
4369 | clear_bit(R5_MadeGoodRepl, &dev->flags); | |
4370 | } | |
415e72d0 | 4371 | if (!test_bit(R5_Insync, &dev->flags)) { |
16a53ecc N |
4372 | /* The ReadError flag will just be confusing now */ |
4373 | clear_bit(R5_ReadError, &dev->flags); | |
4374 | clear_bit(R5_ReWrite, &dev->flags); | |
1da177e4 | 4375 | } |
415e72d0 N |
4376 | if (test_bit(R5_ReadError, &dev->flags)) |
4377 | clear_bit(R5_Insync, &dev->flags); | |
4378 | if (!test_bit(R5_Insync, &dev->flags)) { | |
cc94015a N |
4379 | if (s->failed < 2) |
4380 | s->failed_num[s->failed] = i; | |
4381 | s->failed++; | |
9a3e1101 N |
4382 | if (rdev && !test_bit(Faulty, &rdev->flags)) |
4383 | do_recovery = 1; | |
415e72d0 | 4384 | } |
2ded3703 SL |
4385 | |
4386 | if (test_bit(R5_InJournal, &dev->flags)) | |
4387 | s->injournal++; | |
1e6d690b SL |
4388 | if (test_bit(R5_InJournal, &dev->flags) && dev->written) |
4389 | s->just_cached++; | |
1da177e4 | 4390 | } |
9a3e1101 N |
4391 | if (test_bit(STRIPE_SYNCING, &sh->state)) { |
4392 | /* If there is a failed device being replaced, | |
4393 | * we must be recovering. | |
4394 | * else if we are after recovery_cp, we must be syncing | |
c6d2e084 | 4395 | * else if MD_RECOVERY_REQUESTED is set, we also are syncing. |
9a3e1101 N |
4396 | * else we can only be replacing |
4397 | * sync and recovery both need to read all devices, and so | |
4398 | * use the same flag. | |
4399 | */ | |
4400 | if (do_recovery || | |
c6d2e084 | 4401 | sh->sector >= conf->mddev->recovery_cp || |
4402 | test_bit(MD_RECOVERY_REQUESTED, &(conf->mddev->recovery))) | |
9a3e1101 N |
4403 | s->syncing = 1; |
4404 | else | |
4405 | s->replacing = 1; | |
4406 | } | |
1da177e4 | 4407 | rcu_read_unlock(); |
cc94015a N |
4408 | } |
4409 | ||
59fc630b | 4410 | static int clear_batch_ready(struct stripe_head *sh) |
4411 | { | |
b15a9dbd N |
4412 | /* Return '1' if this is a member of batch, or |
4413 | * '0' if it is a lone stripe or a head which can now be | |
4414 | * handled. | |
4415 | */ | |
59fc630b | 4416 | struct stripe_head *tmp; |
4417 | if (!test_and_clear_bit(STRIPE_BATCH_READY, &sh->state)) | |
b15a9dbd | 4418 | return (sh->batch_head && sh->batch_head != sh); |
59fc630b | 4419 | spin_lock(&sh->stripe_lock); |
4420 | if (!sh->batch_head) { | |
4421 | spin_unlock(&sh->stripe_lock); | |
4422 | return 0; | |
4423 | } | |
4424 | ||
4425 | /* | |
4426 | * this stripe could be added to a batch list before we check | |
4427 | * BATCH_READY, skips it | |
4428 | */ | |
4429 | if (sh->batch_head != sh) { | |
4430 | spin_unlock(&sh->stripe_lock); | |
4431 | return 1; | |
4432 | } | |
4433 | spin_lock(&sh->batch_lock); | |
4434 | list_for_each_entry(tmp, &sh->batch_list, batch_list) | |
4435 | clear_bit(STRIPE_BATCH_READY, &tmp->state); | |
4436 | spin_unlock(&sh->batch_lock); | |
4437 | spin_unlock(&sh->stripe_lock); | |
4438 | ||
4439 | /* | |
4440 | * BATCH_READY is cleared, no new stripes can be added. | |
4441 | * batch_list can be accessed without lock | |
4442 | */ | |
4443 | return 0; | |
4444 | } | |
4445 | ||
3960ce79 N |
4446 | static void break_stripe_batch_list(struct stripe_head *head_sh, |
4447 | unsigned long handle_flags) | |
72ac7330 | 4448 | { |
4e3d62ff | 4449 | struct stripe_head *sh, *next; |
72ac7330 | 4450 | int i; |
fb642b92 | 4451 | int do_wakeup = 0; |
72ac7330 | 4452 | |
bb27051f N |
4453 | list_for_each_entry_safe(sh, next, &head_sh->batch_list, batch_list) { |
4454 | ||
72ac7330 | 4455 | list_del_init(&sh->batch_list); |
4456 | ||
fb3229d5 | 4457 | WARN_ONCE(sh->state & ((1 << STRIPE_ACTIVE) | |
1b956f7a N |
4458 | (1 << STRIPE_SYNCING) | |
4459 | (1 << STRIPE_REPLACED) | | |
1b956f7a N |
4460 | (1 << STRIPE_DELAYED) | |
4461 | (1 << STRIPE_BIT_DELAY) | | |
4462 | (1 << STRIPE_FULL_WRITE) | | |
4463 | (1 << STRIPE_BIOFILL_RUN) | | |
4464 | (1 << STRIPE_COMPUTE_RUN) | | |
4465 | (1 << STRIPE_OPS_REQ_PENDING) | | |
4466 | (1 << STRIPE_DISCARD) | | |
4467 | (1 << STRIPE_BATCH_READY) | | |
4468 | (1 << STRIPE_BATCH_ERR) | | |
fb3229d5 SL |
4469 | (1 << STRIPE_BITMAP_PENDING)), |
4470 | "stripe state: %lx\n", sh->state); | |
4471 | WARN_ONCE(head_sh->state & ((1 << STRIPE_DISCARD) | | |
4472 | (1 << STRIPE_REPLACED)), | |
4473 | "head stripe state: %lx\n", head_sh->state); | |
1b956f7a N |
4474 | |
4475 | set_mask_bits(&sh->state, ~(STRIPE_EXPAND_SYNC_FLAGS | | |
550da24f | 4476 | (1 << STRIPE_PREREAD_ACTIVE) | |
1b956f7a N |
4477 | (1 << STRIPE_DEGRADED)), |
4478 | head_sh->state & (1 << STRIPE_INSYNC)); | |
4479 | ||
72ac7330 | 4480 | sh->check_state = head_sh->check_state; |
4481 | sh->reconstruct_state = head_sh->reconstruct_state; | |
fb642b92 N |
4482 | for (i = 0; i < sh->disks; i++) { |
4483 | if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) | |
4484 | do_wakeup = 1; | |
72ac7330 | 4485 | sh->dev[i].flags = head_sh->dev[i].flags & |
4486 | (~((1 << R5_WriteError) | (1 << R5_Overlap))); | |
fb642b92 | 4487 | } |
72ac7330 | 4488 | spin_lock_irq(&sh->stripe_lock); |
4489 | sh->batch_head = NULL; | |
4490 | spin_unlock_irq(&sh->stripe_lock); | |
3960ce79 N |
4491 | if (handle_flags == 0 || |
4492 | sh->state & handle_flags) | |
4493 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 4494 | raid5_release_stripe(sh); |
72ac7330 | 4495 | } |
fb642b92 N |
4496 | spin_lock_irq(&head_sh->stripe_lock); |
4497 | head_sh->batch_head = NULL; | |
4498 | spin_unlock_irq(&head_sh->stripe_lock); | |
4499 | for (i = 0; i < head_sh->disks; i++) | |
4500 | if (test_and_clear_bit(R5_Overlap, &head_sh->dev[i].flags)) | |
4501 | do_wakeup = 1; | |
3960ce79 N |
4502 | if (head_sh->state & handle_flags) |
4503 | set_bit(STRIPE_HANDLE, &head_sh->state); | |
fb642b92 N |
4504 | |
4505 | if (do_wakeup) | |
4506 | wake_up(&head_sh->raid_conf->wait_for_overlap); | |
72ac7330 | 4507 | } |
4508 | ||
cc94015a N |
4509 | static void handle_stripe(struct stripe_head *sh) |
4510 | { | |
4511 | struct stripe_head_state s; | |
d1688a6d | 4512 | struct r5conf *conf = sh->raid_conf; |
3687c061 | 4513 | int i; |
84789554 N |
4514 | int prexor; |
4515 | int disks = sh->disks; | |
474af965 | 4516 | struct r5dev *pdev, *qdev; |
cc94015a N |
4517 | |
4518 | clear_bit(STRIPE_HANDLE, &sh->state); | |
257a4b42 | 4519 | if (test_and_set_bit_lock(STRIPE_ACTIVE, &sh->state)) { |
cc94015a N |
4520 | /* already being handled, ensure it gets handled |
4521 | * again when current action finishes */ | |
4522 | set_bit(STRIPE_HANDLE, &sh->state); | |
4523 | return; | |
4524 | } | |
4525 | ||
59fc630b | 4526 | if (clear_batch_ready(sh) ) { |
4527 | clear_bit_unlock(STRIPE_ACTIVE, &sh->state); | |
4528 | return; | |
4529 | } | |
4530 | ||
4e3d62ff | 4531 | if (test_and_clear_bit(STRIPE_BATCH_ERR, &sh->state)) |
3960ce79 | 4532 | break_stripe_batch_list(sh, 0); |
72ac7330 | 4533 | |
dabc4ec6 | 4534 | if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state) && !sh->batch_head) { |
f8dfcffd N |
4535 | spin_lock(&sh->stripe_lock); |
4536 | /* Cannot process 'sync' concurrently with 'discard' */ | |
4537 | if (!test_bit(STRIPE_DISCARD, &sh->state) && | |
4538 | test_and_clear_bit(STRIPE_SYNC_REQUESTED, &sh->state)) { | |
4539 | set_bit(STRIPE_SYNCING, &sh->state); | |
4540 | clear_bit(STRIPE_INSYNC, &sh->state); | |
f94c0b66 | 4541 | clear_bit(STRIPE_REPLACED, &sh->state); |
f8dfcffd N |
4542 | } |
4543 | spin_unlock(&sh->stripe_lock); | |
cc94015a N |
4544 | } |
4545 | clear_bit(STRIPE_DELAYED, &sh->state); | |
4546 | ||
4547 | pr_debug("handling stripe %llu, state=%#lx cnt=%d, " | |
4548 | "pd_idx=%d, qd_idx=%d\n, check:%d, reconstruct:%d\n", | |
4549 | (unsigned long long)sh->sector, sh->state, | |
4550 | atomic_read(&sh->count), sh->pd_idx, sh->qd_idx, | |
4551 | sh->check_state, sh->reconstruct_state); | |
3687c061 | 4552 | |
acfe726b | 4553 | analyse_stripe(sh, &s); |
c5a31000 | 4554 | |
b70abcb2 SL |
4555 | if (test_bit(STRIPE_LOG_TRAPPED, &sh->state)) |
4556 | goto finish; | |
4557 | ||
bc2607f3 N |
4558 | if (s.handle_bad_blocks) { |
4559 | set_bit(STRIPE_HANDLE, &sh->state); | |
4560 | goto finish; | |
4561 | } | |
4562 | ||
474af965 N |
4563 | if (unlikely(s.blocked_rdev)) { |
4564 | if (s.syncing || s.expanding || s.expanded || | |
9a3e1101 | 4565 | s.replacing || s.to_write || s.written) { |
474af965 N |
4566 | set_bit(STRIPE_HANDLE, &sh->state); |
4567 | goto finish; | |
4568 | } | |
4569 | /* There is nothing for the blocked_rdev to block */ | |
4570 | rdev_dec_pending(s.blocked_rdev, conf->mddev); | |
4571 | s.blocked_rdev = NULL; | |
4572 | } | |
4573 | ||
4574 | if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) { | |
4575 | set_bit(STRIPE_OP_BIOFILL, &s.ops_request); | |
4576 | set_bit(STRIPE_BIOFILL_RUN, &sh->state); | |
4577 | } | |
4578 | ||
4579 | pr_debug("locked=%d uptodate=%d to_read=%d" | |
4580 | " to_write=%d failed=%d failed_num=%d,%d\n", | |
4581 | s.locked, s.uptodate, s.to_read, s.to_write, s.failed, | |
4582 | s.failed_num[0], s.failed_num[1]); | |
4583 | /* check if the array has lost more than max_degraded devices and, | |
4584 | * if so, some requests might need to be failed. | |
4585 | */ | |
6e74a9cf | 4586 | if (s.failed > conf->max_degraded || s.log_failed) { |
9a3f530f N |
4587 | sh->check_state = 0; |
4588 | sh->reconstruct_state = 0; | |
626f2092 | 4589 | break_stripe_batch_list(sh, 0); |
9a3f530f N |
4590 | if (s.to_read+s.to_write+s.written) |
4591 | handle_failed_stripe(conf, sh, &s, disks, &s.return_bi); | |
9a3e1101 | 4592 | if (s.syncing + s.replacing) |
9a3f530f N |
4593 | handle_failed_sync(conf, sh, &s); |
4594 | } | |
474af965 | 4595 | |
84789554 N |
4596 | /* Now we check to see if any write operations have recently |
4597 | * completed | |
4598 | */ | |
4599 | prexor = 0; | |
4600 | if (sh->reconstruct_state == reconstruct_state_prexor_drain_result) | |
4601 | prexor = 1; | |
4602 | if (sh->reconstruct_state == reconstruct_state_drain_result || | |
4603 | sh->reconstruct_state == reconstruct_state_prexor_drain_result) { | |
4604 | sh->reconstruct_state = reconstruct_state_idle; | |
4605 | ||
4606 | /* All the 'written' buffers and the parity block are ready to | |
4607 | * be written back to disk | |
4608 | */ | |
9e444768 SL |
4609 | BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags) && |
4610 | !test_bit(R5_Discard, &sh->dev[sh->pd_idx].flags)); | |
84789554 | 4611 | BUG_ON(sh->qd_idx >= 0 && |
9e444768 SL |
4612 | !test_bit(R5_UPTODATE, &sh->dev[sh->qd_idx].flags) && |
4613 | !test_bit(R5_Discard, &sh->dev[sh->qd_idx].flags)); | |
84789554 N |
4614 | for (i = disks; i--; ) { |
4615 | struct r5dev *dev = &sh->dev[i]; | |
4616 | if (test_bit(R5_LOCKED, &dev->flags) && | |
4617 | (i == sh->pd_idx || i == sh->qd_idx || | |
1e6d690b SL |
4618 | dev->written || test_bit(R5_InJournal, |
4619 | &dev->flags))) { | |
84789554 N |
4620 | pr_debug("Writing block %d\n", i); |
4621 | set_bit(R5_Wantwrite, &dev->flags); | |
4622 | if (prexor) | |
4623 | continue; | |
9c4bdf69 N |
4624 | if (s.failed > 1) |
4625 | continue; | |
84789554 N |
4626 | if (!test_bit(R5_Insync, &dev->flags) || |
4627 | ((i == sh->pd_idx || i == sh->qd_idx) && | |
4628 | s.failed == 0)) | |
4629 | set_bit(STRIPE_INSYNC, &sh->state); | |
4630 | } | |
4631 | } | |
4632 | if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
4633 | s.dec_preread_active = 1; | |
4634 | } | |
4635 | ||
ef5b7c69 N |
4636 | /* |
4637 | * might be able to return some write requests if the parity blocks | |
4638 | * are safe, or on a failed drive | |
4639 | */ | |
4640 | pdev = &sh->dev[sh->pd_idx]; | |
4641 | s.p_failed = (s.failed >= 1 && s.failed_num[0] == sh->pd_idx) | |
4642 | || (s.failed >= 2 && s.failed_num[1] == sh->pd_idx); | |
4643 | qdev = &sh->dev[sh->qd_idx]; | |
4644 | s.q_failed = (s.failed >= 1 && s.failed_num[0] == sh->qd_idx) | |
4645 | || (s.failed >= 2 && s.failed_num[1] == sh->qd_idx) | |
4646 | || conf->level < 6; | |
4647 | ||
4648 | if (s.written && | |
4649 | (s.p_failed || ((test_bit(R5_Insync, &pdev->flags) | |
4650 | && !test_bit(R5_LOCKED, &pdev->flags) | |
4651 | && (test_bit(R5_UPTODATE, &pdev->flags) || | |
4652 | test_bit(R5_Discard, &pdev->flags))))) && | |
4653 | (s.q_failed || ((test_bit(R5_Insync, &qdev->flags) | |
4654 | && !test_bit(R5_LOCKED, &qdev->flags) | |
4655 | && (test_bit(R5_UPTODATE, &qdev->flags) || | |
4656 | test_bit(R5_Discard, &qdev->flags)))))) | |
4657 | handle_stripe_clean_event(conf, sh, disks, &s.return_bi); | |
4658 | ||
1e6d690b SL |
4659 | if (s.just_cached) |
4660 | r5c_handle_cached_data_endio(conf, sh, disks, &s.return_bi); | |
4661 | r5l_stripe_write_finished(sh); | |
4662 | ||
ef5b7c69 N |
4663 | /* Now we might consider reading some blocks, either to check/generate |
4664 | * parity, or to satisfy requests | |
4665 | * or to load a block that is being partially written. | |
4666 | */ | |
4667 | if (s.to_read || s.non_overwrite | |
4668 | || (conf->level == 6 && s.to_write && s.failed) | |
4669 | || (s.syncing && (s.uptodate + s.compute < disks)) | |
4670 | || s.replacing | |
4671 | || s.expanding) | |
4672 | handle_stripe_fill(sh, &s, disks); | |
4673 | ||
2ded3703 SL |
4674 | /* |
4675 | * When the stripe finishes full journal write cycle (write to journal | |
4676 | * and raid disk), this is the clean up procedure so it is ready for | |
4677 | * next operation. | |
4678 | */ | |
4679 | r5c_finish_stripe_write_out(conf, sh, &s); | |
4680 | ||
4681 | /* | |
4682 | * Now to consider new write requests, cache write back and what else, | |
4683 | * if anything should be read. We do not handle new writes when: | |
84789554 N |
4684 | * 1/ A 'write' operation (copy+xor) is already in flight. |
4685 | * 2/ A 'check' operation is in flight, as it may clobber the parity | |
4686 | * block. | |
2ded3703 | 4687 | * 3/ A r5c cache log write is in flight. |
84789554 | 4688 | */ |
2ded3703 SL |
4689 | |
4690 | if (!sh->reconstruct_state && !sh->check_state && !sh->log_io) { | |
4691 | if (!r5c_is_writeback(conf->log)) { | |
4692 | if (s.to_write) | |
4693 | handle_stripe_dirtying(conf, sh, &s, disks); | |
4694 | } else { /* write back cache */ | |
4695 | int ret = 0; | |
4696 | ||
4697 | /* First, try handle writes in caching phase */ | |
4698 | if (s.to_write) | |
4699 | ret = r5c_try_caching_write(conf, sh, &s, | |
4700 | disks); | |
4701 | /* | |
4702 | * If caching phase failed: ret == -EAGAIN | |
4703 | * OR | |
4704 | * stripe under reclaim: !caching && injournal | |
4705 | * | |
4706 | * fall back to handle_stripe_dirtying() | |
4707 | */ | |
4708 | if (ret == -EAGAIN || | |
4709 | /* stripe under reclaim: !caching && injournal */ | |
4710 | (!test_bit(STRIPE_R5C_CACHING, &sh->state) && | |
d7bd398e SL |
4711 | s.injournal > 0)) { |
4712 | ret = handle_stripe_dirtying(conf, sh, &s, | |
4713 | disks); | |
4714 | if (ret == -EAGAIN) | |
4715 | goto finish; | |
4716 | } | |
2ded3703 SL |
4717 | } |
4718 | } | |
84789554 N |
4719 | |
4720 | /* maybe we need to check and possibly fix the parity for this stripe | |
4721 | * Any reads will already have been scheduled, so we just see if enough | |
4722 | * data is available. The parity check is held off while parity | |
4723 | * dependent operations are in flight. | |
4724 | */ | |
4725 | if (sh->check_state || | |
4726 | (s.syncing && s.locked == 0 && | |
4727 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && | |
4728 | !test_bit(STRIPE_INSYNC, &sh->state))) { | |
4729 | if (conf->level == 6) | |
4730 | handle_parity_checks6(conf, sh, &s, disks); | |
4731 | else | |
4732 | handle_parity_checks5(conf, sh, &s, disks); | |
4733 | } | |
c5a31000 | 4734 | |
f94c0b66 N |
4735 | if ((s.replacing || s.syncing) && s.locked == 0 |
4736 | && !test_bit(STRIPE_COMPUTE_RUN, &sh->state) | |
4737 | && !test_bit(STRIPE_REPLACED, &sh->state)) { | |
9a3e1101 N |
4738 | /* Write out to replacement devices where possible */ |
4739 | for (i = 0; i < conf->raid_disks; i++) | |
f94c0b66 N |
4740 | if (test_bit(R5_NeedReplace, &sh->dev[i].flags)) { |
4741 | WARN_ON(!test_bit(R5_UPTODATE, &sh->dev[i].flags)); | |
9a3e1101 N |
4742 | set_bit(R5_WantReplace, &sh->dev[i].flags); |
4743 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
4744 | s.locked++; | |
4745 | } | |
f94c0b66 N |
4746 | if (s.replacing) |
4747 | set_bit(STRIPE_INSYNC, &sh->state); | |
4748 | set_bit(STRIPE_REPLACED, &sh->state); | |
9a3e1101 N |
4749 | } |
4750 | if ((s.syncing || s.replacing) && s.locked == 0 && | |
f94c0b66 | 4751 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && |
9a3e1101 | 4752 | test_bit(STRIPE_INSYNC, &sh->state)) { |
c5a31000 N |
4753 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); |
4754 | clear_bit(STRIPE_SYNCING, &sh->state); | |
f8dfcffd N |
4755 | if (test_and_clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags)) |
4756 | wake_up(&conf->wait_for_overlap); | |
c5a31000 N |
4757 | } |
4758 | ||
4759 | /* If the failed drives are just a ReadError, then we might need | |
4760 | * to progress the repair/check process | |
4761 | */ | |
4762 | if (s.failed <= conf->max_degraded && !conf->mddev->ro) | |
4763 | for (i = 0; i < s.failed; i++) { | |
4764 | struct r5dev *dev = &sh->dev[s.failed_num[i]]; | |
4765 | if (test_bit(R5_ReadError, &dev->flags) | |
4766 | && !test_bit(R5_LOCKED, &dev->flags) | |
4767 | && test_bit(R5_UPTODATE, &dev->flags) | |
4768 | ) { | |
4769 | if (!test_bit(R5_ReWrite, &dev->flags)) { | |
4770 | set_bit(R5_Wantwrite, &dev->flags); | |
4771 | set_bit(R5_ReWrite, &dev->flags); | |
4772 | set_bit(R5_LOCKED, &dev->flags); | |
4773 | s.locked++; | |
4774 | } else { | |
4775 | /* let's read it back */ | |
4776 | set_bit(R5_Wantread, &dev->flags); | |
4777 | set_bit(R5_LOCKED, &dev->flags); | |
4778 | s.locked++; | |
4779 | } | |
4780 | } | |
4781 | } | |
4782 | ||
3687c061 N |
4783 | /* Finish reconstruct operations initiated by the expansion process */ |
4784 | if (sh->reconstruct_state == reconstruct_state_result) { | |
4785 | struct stripe_head *sh_src | |
6d036f7d | 4786 | = raid5_get_active_stripe(conf, sh->sector, 1, 1, 1); |
3687c061 N |
4787 | if (sh_src && test_bit(STRIPE_EXPAND_SOURCE, &sh_src->state)) { |
4788 | /* sh cannot be written until sh_src has been read. | |
4789 | * so arrange for sh to be delayed a little | |
4790 | */ | |
4791 | set_bit(STRIPE_DELAYED, &sh->state); | |
4792 | set_bit(STRIPE_HANDLE, &sh->state); | |
4793 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, | |
4794 | &sh_src->state)) | |
4795 | atomic_inc(&conf->preread_active_stripes); | |
6d036f7d | 4796 | raid5_release_stripe(sh_src); |
3687c061 N |
4797 | goto finish; |
4798 | } | |
4799 | if (sh_src) | |
6d036f7d | 4800 | raid5_release_stripe(sh_src); |
3687c061 N |
4801 | |
4802 | sh->reconstruct_state = reconstruct_state_idle; | |
4803 | clear_bit(STRIPE_EXPANDING, &sh->state); | |
4804 | for (i = conf->raid_disks; i--; ) { | |
4805 | set_bit(R5_Wantwrite, &sh->dev[i].flags); | |
4806 | set_bit(R5_LOCKED, &sh->dev[i].flags); | |
4807 | s.locked++; | |
4808 | } | |
4809 | } | |
f416885e | 4810 | |
3687c061 N |
4811 | if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) && |
4812 | !sh->reconstruct_state) { | |
4813 | /* Need to write out all blocks after computing parity */ | |
4814 | sh->disks = conf->raid_disks; | |
4815 | stripe_set_idx(sh->sector, conf, 0, sh); | |
4816 | schedule_reconstruction(sh, &s, 1, 1); | |
4817 | } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) { | |
4818 | clear_bit(STRIPE_EXPAND_READY, &sh->state); | |
4819 | atomic_dec(&conf->reshape_stripes); | |
4820 | wake_up(&conf->wait_for_overlap); | |
4821 | md_done_sync(conf->mddev, STRIPE_SECTORS, 1); | |
4822 | } | |
4823 | ||
4824 | if (s.expanding && s.locked == 0 && | |
4825 | !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) | |
4826 | handle_stripe_expansion(conf, sh); | |
16a53ecc | 4827 | |
3687c061 | 4828 | finish: |
6bfe0b49 | 4829 | /* wait for this device to become unblocked */ |
5f066c63 N |
4830 | if (unlikely(s.blocked_rdev)) { |
4831 | if (conf->mddev->external) | |
4832 | md_wait_for_blocked_rdev(s.blocked_rdev, | |
4833 | conf->mddev); | |
4834 | else | |
4835 | /* Internal metadata will immediately | |
4836 | * be written by raid5d, so we don't | |
4837 | * need to wait here. | |
4838 | */ | |
4839 | rdev_dec_pending(s.blocked_rdev, | |
4840 | conf->mddev); | |
4841 | } | |
6bfe0b49 | 4842 | |
bc2607f3 N |
4843 | if (s.handle_bad_blocks) |
4844 | for (i = disks; i--; ) { | |
3cb03002 | 4845 | struct md_rdev *rdev; |
bc2607f3 N |
4846 | struct r5dev *dev = &sh->dev[i]; |
4847 | if (test_and_clear_bit(R5_WriteError, &dev->flags)) { | |
4848 | /* We own a safe reference to the rdev */ | |
4849 | rdev = conf->disks[i].rdev; | |
4850 | if (!rdev_set_badblocks(rdev, sh->sector, | |
4851 | STRIPE_SECTORS, 0)) | |
4852 | md_error(conf->mddev, rdev); | |
4853 | rdev_dec_pending(rdev, conf->mddev); | |
4854 | } | |
b84db560 N |
4855 | if (test_and_clear_bit(R5_MadeGood, &dev->flags)) { |
4856 | rdev = conf->disks[i].rdev; | |
4857 | rdev_clear_badblocks(rdev, sh->sector, | |
c6563a8c | 4858 | STRIPE_SECTORS, 0); |
b84db560 N |
4859 | rdev_dec_pending(rdev, conf->mddev); |
4860 | } | |
977df362 N |
4861 | if (test_and_clear_bit(R5_MadeGoodRepl, &dev->flags)) { |
4862 | rdev = conf->disks[i].replacement; | |
dd054fce N |
4863 | if (!rdev) |
4864 | /* rdev have been moved down */ | |
4865 | rdev = conf->disks[i].rdev; | |
977df362 | 4866 | rdev_clear_badblocks(rdev, sh->sector, |
c6563a8c | 4867 | STRIPE_SECTORS, 0); |
977df362 N |
4868 | rdev_dec_pending(rdev, conf->mddev); |
4869 | } | |
bc2607f3 N |
4870 | } |
4871 | ||
6c0069c0 YT |
4872 | if (s.ops_request) |
4873 | raid_run_ops(sh, s.ops_request); | |
4874 | ||
f0e43bcd | 4875 | ops_run_io(sh, &s); |
16a53ecc | 4876 | |
c5709ef6 | 4877 | if (s.dec_preread_active) { |
729a1866 | 4878 | /* We delay this until after ops_run_io so that if make_request |
e9c7469b | 4879 | * is waiting on a flush, it won't continue until the writes |
729a1866 N |
4880 | * have actually been submitted. |
4881 | */ | |
4882 | atomic_dec(&conf->preread_active_stripes); | |
4883 | if (atomic_read(&conf->preread_active_stripes) < | |
4884 | IO_THRESHOLD) | |
4885 | md_wakeup_thread(conf->mddev->thread); | |
4886 | } | |
4887 | ||
c3cce6cd | 4888 | if (!bio_list_empty(&s.return_bi)) { |
2953079c | 4889 | if (test_bit(MD_SB_CHANGE_PENDING, &conf->mddev->sb_flags)) { |
c3cce6cd N |
4890 | spin_lock_irq(&conf->device_lock); |
4891 | bio_list_merge(&conf->return_bi, &s.return_bi); | |
4892 | spin_unlock_irq(&conf->device_lock); | |
4893 | md_wakeup_thread(conf->mddev->thread); | |
4894 | } else | |
4895 | return_io(&s.return_bi); | |
4896 | } | |
16a53ecc | 4897 | |
257a4b42 | 4898 | clear_bit_unlock(STRIPE_ACTIVE, &sh->state); |
16a53ecc N |
4899 | } |
4900 | ||
d1688a6d | 4901 | static void raid5_activate_delayed(struct r5conf *conf) |
16a53ecc N |
4902 | { |
4903 | if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) { | |
4904 | while (!list_empty(&conf->delayed_list)) { | |
4905 | struct list_head *l = conf->delayed_list.next; | |
4906 | struct stripe_head *sh; | |
4907 | sh = list_entry(l, struct stripe_head, lru); | |
4908 | list_del_init(l); | |
4909 | clear_bit(STRIPE_DELAYED, &sh->state); | |
4910 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
4911 | atomic_inc(&conf->preread_active_stripes); | |
8b3e6cdc | 4912 | list_add_tail(&sh->lru, &conf->hold_list); |
851c30c9 | 4913 | raid5_wakeup_stripe_thread(sh); |
16a53ecc | 4914 | } |
482c0834 | 4915 | } |
16a53ecc N |
4916 | } |
4917 | ||
566c09c5 SL |
4918 | static void activate_bit_delay(struct r5conf *conf, |
4919 | struct list_head *temp_inactive_list) | |
16a53ecc N |
4920 | { |
4921 | /* device_lock is held */ | |
4922 | struct list_head head; | |
4923 | list_add(&head, &conf->bitmap_list); | |
4924 | list_del_init(&conf->bitmap_list); | |
4925 | while (!list_empty(&head)) { | |
4926 | struct stripe_head *sh = list_entry(head.next, struct stripe_head, lru); | |
566c09c5 | 4927 | int hash; |
16a53ecc N |
4928 | list_del_init(&sh->lru); |
4929 | atomic_inc(&sh->count); | |
566c09c5 SL |
4930 | hash = sh->hash_lock_index; |
4931 | __release_stripe(conf, sh, &temp_inactive_list[hash]); | |
16a53ecc N |
4932 | } |
4933 | } | |
4934 | ||
5c675f83 | 4935 | static int raid5_congested(struct mddev *mddev, int bits) |
f022b2fd | 4936 | { |
d1688a6d | 4937 | struct r5conf *conf = mddev->private; |
f022b2fd N |
4938 | |
4939 | /* No difference between reads and writes. Just check | |
4940 | * how busy the stripe_cache is | |
4941 | */ | |
3fa841d7 | 4942 | |
5423399a | 4943 | if (test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state)) |
f022b2fd | 4944 | return 1; |
a39f7afd SL |
4945 | |
4946 | /* Also checks whether there is pressure on r5cache log space */ | |
4947 | if (test_bit(R5C_LOG_TIGHT, &conf->cache_state)) | |
4948 | return 1; | |
f022b2fd N |
4949 | if (conf->quiesce) |
4950 | return 1; | |
4bda556a | 4951 | if (atomic_read(&conf->empty_inactive_list_nr)) |
f022b2fd N |
4952 | return 1; |
4953 | ||
4954 | return 0; | |
4955 | } | |
4956 | ||
fd01b88c | 4957 | static int in_chunk_boundary(struct mddev *mddev, struct bio *bio) |
f679623f | 4958 | { |
3cb5edf4 | 4959 | struct r5conf *conf = mddev->private; |
4f024f37 | 4960 | sector_t sector = bio->bi_iter.bi_sector + get_start_sect(bio->bi_bdev); |
3cb5edf4 | 4961 | unsigned int chunk_sectors; |
aa8b57aa | 4962 | unsigned int bio_sectors = bio_sectors(bio); |
f679623f | 4963 | |
3cb5edf4 | 4964 | chunk_sectors = min(conf->chunk_sectors, conf->prev_chunk_sectors); |
f679623f RBJ |
4965 | return chunk_sectors >= |
4966 | ((sector & (chunk_sectors - 1)) + bio_sectors); | |
4967 | } | |
4968 | ||
46031f9a RBJ |
4969 | /* |
4970 | * add bio to the retry LIFO ( in O(1) ... we are in interrupt ) | |
4971 | * later sampled by raid5d. | |
4972 | */ | |
d1688a6d | 4973 | static void add_bio_to_retry(struct bio *bi,struct r5conf *conf) |
46031f9a RBJ |
4974 | { |
4975 | unsigned long flags; | |
4976 | ||
4977 | spin_lock_irqsave(&conf->device_lock, flags); | |
4978 | ||
4979 | bi->bi_next = conf->retry_read_aligned_list; | |
4980 | conf->retry_read_aligned_list = bi; | |
4981 | ||
4982 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
4983 | md_wakeup_thread(conf->mddev->thread); | |
4984 | } | |
4985 | ||
d1688a6d | 4986 | static struct bio *remove_bio_from_retry(struct r5conf *conf) |
46031f9a RBJ |
4987 | { |
4988 | struct bio *bi; | |
4989 | ||
4990 | bi = conf->retry_read_aligned; | |
4991 | if (bi) { | |
4992 | conf->retry_read_aligned = NULL; | |
4993 | return bi; | |
4994 | } | |
4995 | bi = conf->retry_read_aligned_list; | |
4996 | if(bi) { | |
387bb173 | 4997 | conf->retry_read_aligned_list = bi->bi_next; |
46031f9a | 4998 | bi->bi_next = NULL; |
960e739d JA |
4999 | /* |
5000 | * this sets the active strip count to 1 and the processed | |
5001 | * strip count to zero (upper 8 bits) | |
5002 | */ | |
e7836bd6 | 5003 | raid5_set_bi_stripes(bi, 1); /* biased count of active stripes */ |
46031f9a RBJ |
5004 | } |
5005 | ||
5006 | return bi; | |
5007 | } | |
5008 | ||
f679623f RBJ |
5009 | /* |
5010 | * The "raid5_align_endio" should check if the read succeeded and if it | |
5011 | * did, call bio_endio on the original bio (having bio_put the new bio | |
5012 | * first). | |
5013 | * If the read failed.. | |
5014 | */ | |
4246a0b6 | 5015 | static void raid5_align_endio(struct bio *bi) |
f679623f RBJ |
5016 | { |
5017 | struct bio* raid_bi = bi->bi_private; | |
fd01b88c | 5018 | struct mddev *mddev; |
d1688a6d | 5019 | struct r5conf *conf; |
3cb03002 | 5020 | struct md_rdev *rdev; |
9b81c842 | 5021 | int error = bi->bi_error; |
46031f9a | 5022 | |
f679623f | 5023 | bio_put(bi); |
46031f9a | 5024 | |
46031f9a RBJ |
5025 | rdev = (void*)raid_bi->bi_next; |
5026 | raid_bi->bi_next = NULL; | |
2b7f2228 N |
5027 | mddev = rdev->mddev; |
5028 | conf = mddev->private; | |
46031f9a RBJ |
5029 | |
5030 | rdev_dec_pending(rdev, conf->mddev); | |
5031 | ||
9b81c842 | 5032 | if (!error) { |
0a82a8d1 LT |
5033 | trace_block_bio_complete(bdev_get_queue(raid_bi->bi_bdev), |
5034 | raid_bi, 0); | |
4246a0b6 | 5035 | bio_endio(raid_bi); |
46031f9a | 5036 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
b1b46486 | 5037 | wake_up(&conf->wait_for_quiescent); |
6712ecf8 | 5038 | return; |
46031f9a RBJ |
5039 | } |
5040 | ||
45b4233c | 5041 | pr_debug("raid5_align_endio : io error...handing IO for a retry\n"); |
46031f9a RBJ |
5042 | |
5043 | add_bio_to_retry(raid_bi, conf); | |
f679623f RBJ |
5044 | } |
5045 | ||
7ef6b12a | 5046 | static int raid5_read_one_chunk(struct mddev *mddev, struct bio *raid_bio) |
f679623f | 5047 | { |
d1688a6d | 5048 | struct r5conf *conf = mddev->private; |
8553fe7e | 5049 | int dd_idx; |
f679623f | 5050 | struct bio* align_bi; |
3cb03002 | 5051 | struct md_rdev *rdev; |
671488cc | 5052 | sector_t end_sector; |
f679623f RBJ |
5053 | |
5054 | if (!in_chunk_boundary(mddev, raid_bio)) { | |
7ef6b12a | 5055 | pr_debug("%s: non aligned\n", __func__); |
f679623f RBJ |
5056 | return 0; |
5057 | } | |
5058 | /* | |
a167f663 | 5059 | * use bio_clone_mddev to make a copy of the bio |
f679623f | 5060 | */ |
a167f663 | 5061 | align_bi = bio_clone_mddev(raid_bio, GFP_NOIO, mddev); |
f679623f RBJ |
5062 | if (!align_bi) |
5063 | return 0; | |
5064 | /* | |
5065 | * set bi_end_io to a new function, and set bi_private to the | |
5066 | * original bio. | |
5067 | */ | |
5068 | align_bi->bi_end_io = raid5_align_endio; | |
5069 | align_bi->bi_private = raid_bio; | |
5070 | /* | |
5071 | * compute position | |
5072 | */ | |
4f024f37 KO |
5073 | align_bi->bi_iter.bi_sector = |
5074 | raid5_compute_sector(conf, raid_bio->bi_iter.bi_sector, | |
5075 | 0, &dd_idx, NULL); | |
f679623f | 5076 | |
f73a1c7d | 5077 | end_sector = bio_end_sector(align_bi); |
f679623f | 5078 | rcu_read_lock(); |
671488cc N |
5079 | rdev = rcu_dereference(conf->disks[dd_idx].replacement); |
5080 | if (!rdev || test_bit(Faulty, &rdev->flags) || | |
5081 | rdev->recovery_offset < end_sector) { | |
5082 | rdev = rcu_dereference(conf->disks[dd_idx].rdev); | |
5083 | if (rdev && | |
5084 | (test_bit(Faulty, &rdev->flags) || | |
5085 | !(test_bit(In_sync, &rdev->flags) || | |
5086 | rdev->recovery_offset >= end_sector))) | |
5087 | rdev = NULL; | |
5088 | } | |
03b047f4 SL |
5089 | |
5090 | if (r5c_big_stripe_cached(conf, align_bi->bi_iter.bi_sector)) { | |
5091 | rcu_read_unlock(); | |
5092 | bio_put(align_bi); | |
5093 | return 0; | |
5094 | } | |
5095 | ||
671488cc | 5096 | if (rdev) { |
31c176ec N |
5097 | sector_t first_bad; |
5098 | int bad_sectors; | |
5099 | ||
f679623f RBJ |
5100 | atomic_inc(&rdev->nr_pending); |
5101 | rcu_read_unlock(); | |
46031f9a RBJ |
5102 | raid_bio->bi_next = (void*)rdev; |
5103 | align_bi->bi_bdev = rdev->bdev; | |
b7c44ed9 | 5104 | bio_clear_flag(align_bi, BIO_SEG_VALID); |
46031f9a | 5105 | |
7140aafc | 5106 | if (is_badblock(rdev, align_bi->bi_iter.bi_sector, |
4f024f37 | 5107 | bio_sectors(align_bi), |
31c176ec | 5108 | &first_bad, &bad_sectors)) { |
387bb173 NB |
5109 | bio_put(align_bi); |
5110 | rdev_dec_pending(rdev, mddev); | |
5111 | return 0; | |
5112 | } | |
5113 | ||
6c0544e2 | 5114 | /* No reshape active, so we can trust rdev->data_offset */ |
4f024f37 | 5115 | align_bi->bi_iter.bi_sector += rdev->data_offset; |
6c0544e2 | 5116 | |
46031f9a | 5117 | spin_lock_irq(&conf->device_lock); |
b1b46486 | 5118 | wait_event_lock_irq(conf->wait_for_quiescent, |
46031f9a | 5119 | conf->quiesce == 0, |
eed8c02e | 5120 | conf->device_lock); |
46031f9a RBJ |
5121 | atomic_inc(&conf->active_aligned_reads); |
5122 | spin_unlock_irq(&conf->device_lock); | |
5123 | ||
e3620a3a JB |
5124 | if (mddev->gendisk) |
5125 | trace_block_bio_remap(bdev_get_queue(align_bi->bi_bdev), | |
5126 | align_bi, disk_devt(mddev->gendisk), | |
4f024f37 | 5127 | raid_bio->bi_iter.bi_sector); |
f679623f RBJ |
5128 | generic_make_request(align_bi); |
5129 | return 1; | |
5130 | } else { | |
5131 | rcu_read_unlock(); | |
46031f9a | 5132 | bio_put(align_bi); |
f679623f RBJ |
5133 | return 0; |
5134 | } | |
5135 | } | |
5136 | ||
7ef6b12a ML |
5137 | static struct bio *chunk_aligned_read(struct mddev *mddev, struct bio *raid_bio) |
5138 | { | |
5139 | struct bio *split; | |
5140 | ||
5141 | do { | |
5142 | sector_t sector = raid_bio->bi_iter.bi_sector; | |
5143 | unsigned chunk_sects = mddev->chunk_sectors; | |
5144 | unsigned sectors = chunk_sects - (sector & (chunk_sects-1)); | |
5145 | ||
5146 | if (sectors < bio_sectors(raid_bio)) { | |
5147 | split = bio_split(raid_bio, sectors, GFP_NOIO, fs_bio_set); | |
5148 | bio_chain(split, raid_bio); | |
5149 | } else | |
5150 | split = raid_bio; | |
5151 | ||
5152 | if (!raid5_read_one_chunk(mddev, split)) { | |
5153 | if (split != raid_bio) | |
5154 | generic_make_request(raid_bio); | |
5155 | return split; | |
5156 | } | |
5157 | } while (split != raid_bio); | |
5158 | ||
5159 | return NULL; | |
5160 | } | |
5161 | ||
8b3e6cdc DW |
5162 | /* __get_priority_stripe - get the next stripe to process |
5163 | * | |
5164 | * Full stripe writes are allowed to pass preread active stripes up until | |
5165 | * the bypass_threshold is exceeded. In general the bypass_count | |
5166 | * increments when the handle_list is handled before the hold_list; however, it | |
5167 | * will not be incremented when STRIPE_IO_STARTED is sampled set signifying a | |
5168 | * stripe with in flight i/o. The bypass_count will be reset when the | |
5169 | * head of the hold_list has changed, i.e. the head was promoted to the | |
5170 | * handle_list. | |
5171 | */ | |
851c30c9 | 5172 | static struct stripe_head *__get_priority_stripe(struct r5conf *conf, int group) |
8b3e6cdc | 5173 | { |
851c30c9 SL |
5174 | struct stripe_head *sh = NULL, *tmp; |
5175 | struct list_head *handle_list = NULL; | |
bfc90cb0 | 5176 | struct r5worker_group *wg = NULL; |
851c30c9 SL |
5177 | |
5178 | if (conf->worker_cnt_per_group == 0) { | |
5179 | handle_list = &conf->handle_list; | |
5180 | } else if (group != ANY_GROUP) { | |
5181 | handle_list = &conf->worker_groups[group].handle_list; | |
bfc90cb0 | 5182 | wg = &conf->worker_groups[group]; |
851c30c9 SL |
5183 | } else { |
5184 | int i; | |
5185 | for (i = 0; i < conf->group_cnt; i++) { | |
5186 | handle_list = &conf->worker_groups[i].handle_list; | |
bfc90cb0 | 5187 | wg = &conf->worker_groups[i]; |
851c30c9 SL |
5188 | if (!list_empty(handle_list)) |
5189 | break; | |
5190 | } | |
5191 | } | |
8b3e6cdc DW |
5192 | |
5193 | pr_debug("%s: handle: %s hold: %s full_writes: %d bypass_count: %d\n", | |
5194 | __func__, | |
851c30c9 | 5195 | list_empty(handle_list) ? "empty" : "busy", |
8b3e6cdc DW |
5196 | list_empty(&conf->hold_list) ? "empty" : "busy", |
5197 | atomic_read(&conf->pending_full_writes), conf->bypass_count); | |
5198 | ||
851c30c9 SL |
5199 | if (!list_empty(handle_list)) { |
5200 | sh = list_entry(handle_list->next, typeof(*sh), lru); | |
8b3e6cdc DW |
5201 | |
5202 | if (list_empty(&conf->hold_list)) | |
5203 | conf->bypass_count = 0; | |
5204 | else if (!test_bit(STRIPE_IO_STARTED, &sh->state)) { | |
5205 | if (conf->hold_list.next == conf->last_hold) | |
5206 | conf->bypass_count++; | |
5207 | else { | |
5208 | conf->last_hold = conf->hold_list.next; | |
5209 | conf->bypass_count -= conf->bypass_threshold; | |
5210 | if (conf->bypass_count < 0) | |
5211 | conf->bypass_count = 0; | |
5212 | } | |
5213 | } | |
5214 | } else if (!list_empty(&conf->hold_list) && | |
5215 | ((conf->bypass_threshold && | |
5216 | conf->bypass_count > conf->bypass_threshold) || | |
5217 | atomic_read(&conf->pending_full_writes) == 0)) { | |
851c30c9 SL |
5218 | |
5219 | list_for_each_entry(tmp, &conf->hold_list, lru) { | |
5220 | if (conf->worker_cnt_per_group == 0 || | |
5221 | group == ANY_GROUP || | |
5222 | !cpu_online(tmp->cpu) || | |
5223 | cpu_to_group(tmp->cpu) == group) { | |
5224 | sh = tmp; | |
5225 | break; | |
5226 | } | |
5227 | } | |
5228 | ||
5229 | if (sh) { | |
5230 | conf->bypass_count -= conf->bypass_threshold; | |
5231 | if (conf->bypass_count < 0) | |
5232 | conf->bypass_count = 0; | |
5233 | } | |
bfc90cb0 | 5234 | wg = NULL; |
851c30c9 SL |
5235 | } |
5236 | ||
5237 | if (!sh) | |
8b3e6cdc DW |
5238 | return NULL; |
5239 | ||
bfc90cb0 SL |
5240 | if (wg) { |
5241 | wg->stripes_cnt--; | |
5242 | sh->group = NULL; | |
5243 | } | |
8b3e6cdc | 5244 | list_del_init(&sh->lru); |
c7a6d35e | 5245 | BUG_ON(atomic_inc_return(&sh->count) != 1); |
8b3e6cdc DW |
5246 | return sh; |
5247 | } | |
f679623f | 5248 | |
8811b596 SL |
5249 | struct raid5_plug_cb { |
5250 | struct blk_plug_cb cb; | |
5251 | struct list_head list; | |
566c09c5 | 5252 | struct list_head temp_inactive_list[NR_STRIPE_HASH_LOCKS]; |
8811b596 SL |
5253 | }; |
5254 | ||
5255 | static void raid5_unplug(struct blk_plug_cb *blk_cb, bool from_schedule) | |
5256 | { | |
5257 | struct raid5_plug_cb *cb = container_of( | |
5258 | blk_cb, struct raid5_plug_cb, cb); | |
5259 | struct stripe_head *sh; | |
5260 | struct mddev *mddev = cb->cb.data; | |
5261 | struct r5conf *conf = mddev->private; | |
a9add5d9 | 5262 | int cnt = 0; |
566c09c5 | 5263 | int hash; |
8811b596 SL |
5264 | |
5265 | if (cb->list.next && !list_empty(&cb->list)) { | |
5266 | spin_lock_irq(&conf->device_lock); | |
5267 | while (!list_empty(&cb->list)) { | |
5268 | sh = list_first_entry(&cb->list, struct stripe_head, lru); | |
5269 | list_del_init(&sh->lru); | |
5270 | /* | |
5271 | * avoid race release_stripe_plug() sees | |
5272 | * STRIPE_ON_UNPLUG_LIST clear but the stripe | |
5273 | * is still in our list | |
5274 | */ | |
4e857c58 | 5275 | smp_mb__before_atomic(); |
8811b596 | 5276 | clear_bit(STRIPE_ON_UNPLUG_LIST, &sh->state); |
773ca82f SL |
5277 | /* |
5278 | * STRIPE_ON_RELEASE_LIST could be set here. In that | |
5279 | * case, the count is always > 1 here | |
5280 | */ | |
566c09c5 SL |
5281 | hash = sh->hash_lock_index; |
5282 | __release_stripe(conf, sh, &cb->temp_inactive_list[hash]); | |
a9add5d9 | 5283 | cnt++; |
8811b596 SL |
5284 | } |
5285 | spin_unlock_irq(&conf->device_lock); | |
5286 | } | |
566c09c5 SL |
5287 | release_inactive_stripe_list(conf, cb->temp_inactive_list, |
5288 | NR_STRIPE_HASH_LOCKS); | |
e3620a3a JB |
5289 | if (mddev->queue) |
5290 | trace_block_unplug(mddev->queue, cnt, !from_schedule); | |
8811b596 SL |
5291 | kfree(cb); |
5292 | } | |
5293 | ||
5294 | static void release_stripe_plug(struct mddev *mddev, | |
5295 | struct stripe_head *sh) | |
5296 | { | |
5297 | struct blk_plug_cb *blk_cb = blk_check_plugged( | |
5298 | raid5_unplug, mddev, | |
5299 | sizeof(struct raid5_plug_cb)); | |
5300 | struct raid5_plug_cb *cb; | |
5301 | ||
5302 | if (!blk_cb) { | |
6d036f7d | 5303 | raid5_release_stripe(sh); |
8811b596 SL |
5304 | return; |
5305 | } | |
5306 | ||
5307 | cb = container_of(blk_cb, struct raid5_plug_cb, cb); | |
5308 | ||
566c09c5 SL |
5309 | if (cb->list.next == NULL) { |
5310 | int i; | |
8811b596 | 5311 | INIT_LIST_HEAD(&cb->list); |
566c09c5 SL |
5312 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) |
5313 | INIT_LIST_HEAD(cb->temp_inactive_list + i); | |
5314 | } | |
8811b596 SL |
5315 | |
5316 | if (!test_and_set_bit(STRIPE_ON_UNPLUG_LIST, &sh->state)) | |
5317 | list_add_tail(&sh->lru, &cb->list); | |
5318 | else | |
6d036f7d | 5319 | raid5_release_stripe(sh); |
8811b596 SL |
5320 | } |
5321 | ||
620125f2 SL |
5322 | static void make_discard_request(struct mddev *mddev, struct bio *bi) |
5323 | { | |
5324 | struct r5conf *conf = mddev->private; | |
5325 | sector_t logical_sector, last_sector; | |
5326 | struct stripe_head *sh; | |
5327 | int remaining; | |
5328 | int stripe_sectors; | |
5329 | ||
5330 | if (mddev->reshape_position != MaxSector) | |
5331 | /* Skip discard while reshape is happening */ | |
5332 | return; | |
5333 | ||
4f024f37 KO |
5334 | logical_sector = bi->bi_iter.bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
5335 | last_sector = bi->bi_iter.bi_sector + (bi->bi_iter.bi_size>>9); | |
620125f2 SL |
5336 | |
5337 | bi->bi_next = NULL; | |
5338 | bi->bi_phys_segments = 1; /* over-loaded to count active stripes */ | |
5339 | ||
5340 | stripe_sectors = conf->chunk_sectors * | |
5341 | (conf->raid_disks - conf->max_degraded); | |
5342 | logical_sector = DIV_ROUND_UP_SECTOR_T(logical_sector, | |
5343 | stripe_sectors); | |
5344 | sector_div(last_sector, stripe_sectors); | |
5345 | ||
5346 | logical_sector *= conf->chunk_sectors; | |
5347 | last_sector *= conf->chunk_sectors; | |
5348 | ||
5349 | for (; logical_sector < last_sector; | |
5350 | logical_sector += STRIPE_SECTORS) { | |
5351 | DEFINE_WAIT(w); | |
5352 | int d; | |
5353 | again: | |
6d036f7d | 5354 | sh = raid5_get_active_stripe(conf, logical_sector, 0, 0, 0); |
620125f2 SL |
5355 | prepare_to_wait(&conf->wait_for_overlap, &w, |
5356 | TASK_UNINTERRUPTIBLE); | |
f8dfcffd N |
5357 | set_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags); |
5358 | if (test_bit(STRIPE_SYNCING, &sh->state)) { | |
6d036f7d | 5359 | raid5_release_stripe(sh); |
f8dfcffd N |
5360 | schedule(); |
5361 | goto again; | |
5362 | } | |
5363 | clear_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags); | |
620125f2 SL |
5364 | spin_lock_irq(&sh->stripe_lock); |
5365 | for (d = 0; d < conf->raid_disks; d++) { | |
5366 | if (d == sh->pd_idx || d == sh->qd_idx) | |
5367 | continue; | |
5368 | if (sh->dev[d].towrite || sh->dev[d].toread) { | |
5369 | set_bit(R5_Overlap, &sh->dev[d].flags); | |
5370 | spin_unlock_irq(&sh->stripe_lock); | |
6d036f7d | 5371 | raid5_release_stripe(sh); |
620125f2 SL |
5372 | schedule(); |
5373 | goto again; | |
5374 | } | |
5375 | } | |
f8dfcffd | 5376 | set_bit(STRIPE_DISCARD, &sh->state); |
620125f2 | 5377 | finish_wait(&conf->wait_for_overlap, &w); |
7a87f434 | 5378 | sh->overwrite_disks = 0; |
620125f2 SL |
5379 | for (d = 0; d < conf->raid_disks; d++) { |
5380 | if (d == sh->pd_idx || d == sh->qd_idx) | |
5381 | continue; | |
5382 | sh->dev[d].towrite = bi; | |
5383 | set_bit(R5_OVERWRITE, &sh->dev[d].flags); | |
5384 | raid5_inc_bi_active_stripes(bi); | |
7a87f434 | 5385 | sh->overwrite_disks++; |
620125f2 SL |
5386 | } |
5387 | spin_unlock_irq(&sh->stripe_lock); | |
5388 | if (conf->mddev->bitmap) { | |
5389 | for (d = 0; | |
5390 | d < conf->raid_disks - conf->max_degraded; | |
5391 | d++) | |
5392 | bitmap_startwrite(mddev->bitmap, | |
5393 | sh->sector, | |
5394 | STRIPE_SECTORS, | |
5395 | 0); | |
5396 | sh->bm_seq = conf->seq_flush + 1; | |
5397 | set_bit(STRIPE_BIT_DELAY, &sh->state); | |
5398 | } | |
5399 | ||
5400 | set_bit(STRIPE_HANDLE, &sh->state); | |
5401 | clear_bit(STRIPE_DELAYED, &sh->state); | |
5402 | if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) | |
5403 | atomic_inc(&conf->preread_active_stripes); | |
5404 | release_stripe_plug(mddev, sh); | |
5405 | } | |
5406 | ||
5407 | remaining = raid5_dec_bi_active_stripes(bi); | |
5408 | if (remaining == 0) { | |
5409 | md_write_end(mddev); | |
4246a0b6 | 5410 | bio_endio(bi); |
620125f2 SL |
5411 | } |
5412 | } | |
5413 | ||
849674e4 | 5414 | static void raid5_make_request(struct mddev *mddev, struct bio * bi) |
1da177e4 | 5415 | { |
d1688a6d | 5416 | struct r5conf *conf = mddev->private; |
911d4ee8 | 5417 | int dd_idx; |
1da177e4 LT |
5418 | sector_t new_sector; |
5419 | sector_t logical_sector, last_sector; | |
5420 | struct stripe_head *sh; | |
a362357b | 5421 | const int rw = bio_data_dir(bi); |
49077326 | 5422 | int remaining; |
27c0f68f SL |
5423 | DEFINE_WAIT(w); |
5424 | bool do_prepare; | |
3bddb7f8 | 5425 | bool do_flush = false; |
1da177e4 | 5426 | |
1eff9d32 | 5427 | if (unlikely(bi->bi_opf & REQ_PREFLUSH)) { |
828cbe98 SL |
5428 | int ret = r5l_handle_flush_request(conf->log, bi); |
5429 | ||
5430 | if (ret == 0) | |
5431 | return; | |
5432 | if (ret == -ENODEV) { | |
5433 | md_flush_request(mddev, bi); | |
5434 | return; | |
5435 | } | |
5436 | /* ret == -EAGAIN, fallback */ | |
3bddb7f8 SL |
5437 | /* |
5438 | * if r5l_handle_flush_request() didn't clear REQ_PREFLUSH, | |
5439 | * we need to flush journal device | |
5440 | */ | |
5441 | do_flush = bi->bi_opf & REQ_PREFLUSH; | |
e5dcdd80 N |
5442 | } |
5443 | ||
3d310eb7 | 5444 | md_write_start(mddev, bi); |
06d91a5f | 5445 | |
9ffc8f7c EM |
5446 | /* |
5447 | * If array is degraded, better not do chunk aligned read because | |
5448 | * later we might have to read it again in order to reconstruct | |
5449 | * data on failed drives. | |
5450 | */ | |
5451 | if (rw == READ && mddev->degraded == 0 && | |
7ef6b12a ML |
5452 | mddev->reshape_position == MaxSector) { |
5453 | bi = chunk_aligned_read(mddev, bi); | |
5454 | if (!bi) | |
5455 | return; | |
5456 | } | |
52488615 | 5457 | |
796a5cf0 | 5458 | if (unlikely(bio_op(bi) == REQ_OP_DISCARD)) { |
620125f2 SL |
5459 | make_discard_request(mddev, bi); |
5460 | return; | |
5461 | } | |
5462 | ||
4f024f37 | 5463 | logical_sector = bi->bi_iter.bi_sector & ~((sector_t)STRIPE_SECTORS-1); |
f73a1c7d | 5464 | last_sector = bio_end_sector(bi); |
1da177e4 LT |
5465 | bi->bi_next = NULL; |
5466 | bi->bi_phys_segments = 1; /* over-loaded to count active stripes */ | |
06d91a5f | 5467 | |
27c0f68f | 5468 | prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE); |
1da177e4 | 5469 | for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) { |
b5663ba4 | 5470 | int previous; |
c46501b2 | 5471 | int seq; |
b578d55f | 5472 | |
27c0f68f | 5473 | do_prepare = false; |
7ecaa1e6 | 5474 | retry: |
c46501b2 | 5475 | seq = read_seqcount_begin(&conf->gen_lock); |
b5663ba4 | 5476 | previous = 0; |
27c0f68f SL |
5477 | if (do_prepare) |
5478 | prepare_to_wait(&conf->wait_for_overlap, &w, | |
5479 | TASK_UNINTERRUPTIBLE); | |
b0f9ec04 | 5480 | if (unlikely(conf->reshape_progress != MaxSector)) { |
fef9c61f | 5481 | /* spinlock is needed as reshape_progress may be |
df8e7f76 N |
5482 | * 64bit on a 32bit platform, and so it might be |
5483 | * possible to see a half-updated value | |
aeb878b0 | 5484 | * Of course reshape_progress could change after |
df8e7f76 N |
5485 | * the lock is dropped, so once we get a reference |
5486 | * to the stripe that we think it is, we will have | |
5487 | * to check again. | |
5488 | */ | |
7ecaa1e6 | 5489 | spin_lock_irq(&conf->device_lock); |
2c810cdd | 5490 | if (mddev->reshape_backwards |
fef9c61f N |
5491 | ? logical_sector < conf->reshape_progress |
5492 | : logical_sector >= conf->reshape_progress) { | |
b5663ba4 N |
5493 | previous = 1; |
5494 | } else { | |
2c810cdd | 5495 | if (mddev->reshape_backwards |
fef9c61f N |
5496 | ? logical_sector < conf->reshape_safe |
5497 | : logical_sector >= conf->reshape_safe) { | |
b578d55f N |
5498 | spin_unlock_irq(&conf->device_lock); |
5499 | schedule(); | |
27c0f68f | 5500 | do_prepare = true; |
b578d55f N |
5501 | goto retry; |
5502 | } | |
5503 | } | |
7ecaa1e6 N |
5504 | spin_unlock_irq(&conf->device_lock); |
5505 | } | |
16a53ecc | 5506 | |
112bf897 N |
5507 | new_sector = raid5_compute_sector(conf, logical_sector, |
5508 | previous, | |
911d4ee8 | 5509 | &dd_idx, NULL); |
849674e4 | 5510 | pr_debug("raid456: raid5_make_request, sector %llu logical %llu\n", |
c46501b2 | 5511 | (unsigned long long)new_sector, |
1da177e4 LT |
5512 | (unsigned long long)logical_sector); |
5513 | ||
6d036f7d | 5514 | sh = raid5_get_active_stripe(conf, new_sector, previous, |
1eff9d32 | 5515 | (bi->bi_opf & REQ_RAHEAD), 0); |
1da177e4 | 5516 | if (sh) { |
b0f9ec04 | 5517 | if (unlikely(previous)) { |
7ecaa1e6 | 5518 | /* expansion might have moved on while waiting for a |
df8e7f76 N |
5519 | * stripe, so we must do the range check again. |
5520 | * Expansion could still move past after this | |
5521 | * test, but as we are holding a reference to | |
5522 | * 'sh', we know that if that happens, | |
5523 | * STRIPE_EXPANDING will get set and the expansion | |
5524 | * won't proceed until we finish with the stripe. | |
7ecaa1e6 N |
5525 | */ |
5526 | int must_retry = 0; | |
5527 | spin_lock_irq(&conf->device_lock); | |
2c810cdd | 5528 | if (mddev->reshape_backwards |
b0f9ec04 N |
5529 | ? logical_sector >= conf->reshape_progress |
5530 | : logical_sector < conf->reshape_progress) | |
7ecaa1e6 N |
5531 | /* mismatch, need to try again */ |
5532 | must_retry = 1; | |
5533 | spin_unlock_irq(&conf->device_lock); | |
5534 | if (must_retry) { | |
6d036f7d | 5535 | raid5_release_stripe(sh); |
7a3ab908 | 5536 | schedule(); |
27c0f68f | 5537 | do_prepare = true; |
7ecaa1e6 N |
5538 | goto retry; |
5539 | } | |
5540 | } | |
c46501b2 N |
5541 | if (read_seqcount_retry(&conf->gen_lock, seq)) { |
5542 | /* Might have got the wrong stripe_head | |
5543 | * by accident | |
5544 | */ | |
6d036f7d | 5545 | raid5_release_stripe(sh); |
c46501b2 N |
5546 | goto retry; |
5547 | } | |
e62e58a5 | 5548 | |
ffd96e35 | 5549 | if (rw == WRITE && |
a5c308d4 | 5550 | logical_sector >= mddev->suspend_lo && |
e464eafd | 5551 | logical_sector < mddev->suspend_hi) { |
6d036f7d | 5552 | raid5_release_stripe(sh); |
e62e58a5 N |
5553 | /* As the suspend_* range is controlled by |
5554 | * userspace, we want an interruptible | |
5555 | * wait. | |
5556 | */ | |
5557 | flush_signals(current); | |
5558 | prepare_to_wait(&conf->wait_for_overlap, | |
5559 | &w, TASK_INTERRUPTIBLE); | |
5560 | if (logical_sector >= mddev->suspend_lo && | |
27c0f68f | 5561 | logical_sector < mddev->suspend_hi) { |
e62e58a5 | 5562 | schedule(); |
27c0f68f SL |
5563 | do_prepare = true; |
5564 | } | |
e464eafd N |
5565 | goto retry; |
5566 | } | |
7ecaa1e6 N |
5567 | |
5568 | if (test_bit(STRIPE_EXPANDING, &sh->state) || | |
da41ba65 | 5569 | !add_stripe_bio(sh, bi, dd_idx, rw, previous)) { |
7ecaa1e6 N |
5570 | /* Stripe is busy expanding or |
5571 | * add failed due to overlap. Flush everything | |
1da177e4 LT |
5572 | * and wait a while |
5573 | */ | |
482c0834 | 5574 | md_wakeup_thread(mddev->thread); |
6d036f7d | 5575 | raid5_release_stripe(sh); |
1da177e4 | 5576 | schedule(); |
27c0f68f | 5577 | do_prepare = true; |
1da177e4 LT |
5578 | goto retry; |
5579 | } | |
3bddb7f8 SL |
5580 | if (do_flush) { |
5581 | set_bit(STRIPE_R5C_PREFLUSH, &sh->state); | |
5582 | /* we only need flush for one stripe */ | |
5583 | do_flush = false; | |
5584 | } | |
5585 | ||
6ed3003c N |
5586 | set_bit(STRIPE_HANDLE, &sh->state); |
5587 | clear_bit(STRIPE_DELAYED, &sh->state); | |
59fc630b | 5588 | if ((!sh->batch_head || sh == sh->batch_head) && |
1eff9d32 | 5589 | (bi->bi_opf & REQ_SYNC) && |
729a1866 N |
5590 | !test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) |
5591 | atomic_inc(&conf->preread_active_stripes); | |
8811b596 | 5592 | release_stripe_plug(mddev, sh); |
1da177e4 LT |
5593 | } else { |
5594 | /* cannot get stripe for read-ahead, just give-up */ | |
4246a0b6 | 5595 | bi->bi_error = -EIO; |
1da177e4 LT |
5596 | break; |
5597 | } | |
1da177e4 | 5598 | } |
27c0f68f | 5599 | finish_wait(&conf->wait_for_overlap, &w); |
7c13edc8 | 5600 | |
e7836bd6 | 5601 | remaining = raid5_dec_bi_active_stripes(bi); |
f6344757 | 5602 | if (remaining == 0) { |
1da177e4 | 5603 | |
16a53ecc | 5604 | if ( rw == WRITE ) |
1da177e4 | 5605 | md_write_end(mddev); |
6712ecf8 | 5606 | |
0a82a8d1 LT |
5607 | trace_block_bio_complete(bdev_get_queue(bi->bi_bdev), |
5608 | bi, 0); | |
4246a0b6 | 5609 | bio_endio(bi); |
1da177e4 | 5610 | } |
1da177e4 LT |
5611 | } |
5612 | ||
fd01b88c | 5613 | static sector_t raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks); |
b522adcd | 5614 | |
fd01b88c | 5615 | static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *skipped) |
1da177e4 | 5616 | { |
52c03291 N |
5617 | /* reshaping is quite different to recovery/resync so it is |
5618 | * handled quite separately ... here. | |
5619 | * | |
5620 | * On each call to sync_request, we gather one chunk worth of | |
5621 | * destination stripes and flag them as expanding. | |
5622 | * Then we find all the source stripes and request reads. | |
5623 | * As the reads complete, handle_stripe will copy the data | |
5624 | * into the destination stripe and release that stripe. | |
5625 | */ | |
d1688a6d | 5626 | struct r5conf *conf = mddev->private; |
1da177e4 | 5627 | struct stripe_head *sh; |
ccfcc3c1 | 5628 | sector_t first_sector, last_sector; |
f416885e N |
5629 | int raid_disks = conf->previous_raid_disks; |
5630 | int data_disks = raid_disks - conf->max_degraded; | |
5631 | int new_data_disks = conf->raid_disks - conf->max_degraded; | |
52c03291 N |
5632 | int i; |
5633 | int dd_idx; | |
c8f517c4 | 5634 | sector_t writepos, readpos, safepos; |
ec32a2bd | 5635 | sector_t stripe_addr; |
7a661381 | 5636 | int reshape_sectors; |
ab69ae12 | 5637 | struct list_head stripes; |
92140480 | 5638 | sector_t retn; |
52c03291 | 5639 | |
fef9c61f N |
5640 | if (sector_nr == 0) { |
5641 | /* If restarting in the middle, skip the initial sectors */ | |
2c810cdd | 5642 | if (mddev->reshape_backwards && |
fef9c61f N |
5643 | conf->reshape_progress < raid5_size(mddev, 0, 0)) { |
5644 | sector_nr = raid5_size(mddev, 0, 0) | |
5645 | - conf->reshape_progress; | |
6cbd8148 N |
5646 | } else if (mddev->reshape_backwards && |
5647 | conf->reshape_progress == MaxSector) { | |
5648 | /* shouldn't happen, but just in case, finish up.*/ | |
5649 | sector_nr = MaxSector; | |
2c810cdd | 5650 | } else if (!mddev->reshape_backwards && |
fef9c61f N |
5651 | conf->reshape_progress > 0) |
5652 | sector_nr = conf->reshape_progress; | |
f416885e | 5653 | sector_div(sector_nr, new_data_disks); |
fef9c61f | 5654 | if (sector_nr) { |
8dee7211 N |
5655 | mddev->curr_resync_completed = sector_nr; |
5656 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
fef9c61f | 5657 | *skipped = 1; |
92140480 N |
5658 | retn = sector_nr; |
5659 | goto finish; | |
fef9c61f | 5660 | } |
52c03291 N |
5661 | } |
5662 | ||
7a661381 N |
5663 | /* We need to process a full chunk at a time. |
5664 | * If old and new chunk sizes differ, we need to process the | |
5665 | * largest of these | |
5666 | */ | |
3cb5edf4 N |
5667 | |
5668 | reshape_sectors = max(conf->chunk_sectors, conf->prev_chunk_sectors); | |
7a661381 | 5669 | |
b5254dd5 N |
5670 | /* We update the metadata at least every 10 seconds, or when |
5671 | * the data about to be copied would over-write the source of | |
5672 | * the data at the front of the range. i.e. one new_stripe | |
5673 | * along from reshape_progress new_maps to after where | |
5674 | * reshape_safe old_maps to | |
52c03291 | 5675 | */ |
fef9c61f | 5676 | writepos = conf->reshape_progress; |
f416885e | 5677 | sector_div(writepos, new_data_disks); |
c8f517c4 N |
5678 | readpos = conf->reshape_progress; |
5679 | sector_div(readpos, data_disks); | |
fef9c61f | 5680 | safepos = conf->reshape_safe; |
f416885e | 5681 | sector_div(safepos, data_disks); |
2c810cdd | 5682 | if (mddev->reshape_backwards) { |
c74c0d76 N |
5683 | BUG_ON(writepos < reshape_sectors); |
5684 | writepos -= reshape_sectors; | |
c8f517c4 | 5685 | readpos += reshape_sectors; |
7a661381 | 5686 | safepos += reshape_sectors; |
fef9c61f | 5687 | } else { |
7a661381 | 5688 | writepos += reshape_sectors; |
c74c0d76 N |
5689 | /* readpos and safepos are worst-case calculations. |
5690 | * A negative number is overly pessimistic, and causes | |
5691 | * obvious problems for unsigned storage. So clip to 0. | |
5692 | */ | |
ed37d83e N |
5693 | readpos -= min_t(sector_t, reshape_sectors, readpos); |
5694 | safepos -= min_t(sector_t, reshape_sectors, safepos); | |
fef9c61f | 5695 | } |
52c03291 | 5696 | |
b5254dd5 N |
5697 | /* Having calculated the 'writepos' possibly use it |
5698 | * to set 'stripe_addr' which is where we will write to. | |
5699 | */ | |
5700 | if (mddev->reshape_backwards) { | |
5701 | BUG_ON(conf->reshape_progress == 0); | |
5702 | stripe_addr = writepos; | |
5703 | BUG_ON((mddev->dev_sectors & | |
5704 | ~((sector_t)reshape_sectors - 1)) | |
5705 | - reshape_sectors - stripe_addr | |
5706 | != sector_nr); | |
5707 | } else { | |
5708 | BUG_ON(writepos != sector_nr + reshape_sectors); | |
5709 | stripe_addr = sector_nr; | |
5710 | } | |
5711 | ||
c8f517c4 N |
5712 | /* 'writepos' is the most advanced device address we might write. |
5713 | * 'readpos' is the least advanced device address we might read. | |
5714 | * 'safepos' is the least address recorded in the metadata as having | |
5715 | * been reshaped. | |
b5254dd5 N |
5716 | * If there is a min_offset_diff, these are adjusted either by |
5717 | * increasing the safepos/readpos if diff is negative, or | |
5718 | * increasing writepos if diff is positive. | |
5719 | * If 'readpos' is then behind 'writepos', there is no way that we can | |
c8f517c4 N |
5720 | * ensure safety in the face of a crash - that must be done by userspace |
5721 | * making a backup of the data. So in that case there is no particular | |
5722 | * rush to update metadata. | |
5723 | * Otherwise if 'safepos' is behind 'writepos', then we really need to | |
5724 | * update the metadata to advance 'safepos' to match 'readpos' so that | |
5725 | * we can be safe in the event of a crash. | |
5726 | * So we insist on updating metadata if safepos is behind writepos and | |
5727 | * readpos is beyond writepos. | |
5728 | * In any case, update the metadata every 10 seconds. | |
5729 | * Maybe that number should be configurable, but I'm not sure it is | |
5730 | * worth it.... maybe it could be a multiple of safemode_delay??? | |
5731 | */ | |
b5254dd5 N |
5732 | if (conf->min_offset_diff < 0) { |
5733 | safepos += -conf->min_offset_diff; | |
5734 | readpos += -conf->min_offset_diff; | |
5735 | } else | |
5736 | writepos += conf->min_offset_diff; | |
5737 | ||
2c810cdd | 5738 | if ((mddev->reshape_backwards |
c8f517c4 N |
5739 | ? (safepos > writepos && readpos < writepos) |
5740 | : (safepos < writepos && readpos > writepos)) || | |
5741 | time_after(jiffies, conf->reshape_checkpoint + 10*HZ)) { | |
52c03291 N |
5742 | /* Cannot proceed until we've updated the superblock... */ |
5743 | wait_event(conf->wait_for_overlap, | |
c91abf5a N |
5744 | atomic_read(&conf->reshape_stripes)==0 |
5745 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); | |
5746 | if (atomic_read(&conf->reshape_stripes) != 0) | |
5747 | return 0; | |
fef9c61f | 5748 | mddev->reshape_position = conf->reshape_progress; |
75d3da43 | 5749 | mddev->curr_resync_completed = sector_nr; |
c8f517c4 | 5750 | conf->reshape_checkpoint = jiffies; |
2953079c | 5751 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
52c03291 | 5752 | md_wakeup_thread(mddev->thread); |
2953079c | 5753 | wait_event(mddev->sb_wait, mddev->sb_flags == 0 || |
c91abf5a N |
5754 | test_bit(MD_RECOVERY_INTR, &mddev->recovery)); |
5755 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
5756 | return 0; | |
52c03291 | 5757 | spin_lock_irq(&conf->device_lock); |
fef9c61f | 5758 | conf->reshape_safe = mddev->reshape_position; |
52c03291 N |
5759 | spin_unlock_irq(&conf->device_lock); |
5760 | wake_up(&conf->wait_for_overlap); | |
acb180b0 | 5761 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
52c03291 N |
5762 | } |
5763 | ||
ab69ae12 | 5764 | INIT_LIST_HEAD(&stripes); |
7a661381 | 5765 | for (i = 0; i < reshape_sectors; i += STRIPE_SECTORS) { |
52c03291 | 5766 | int j; |
a9f326eb | 5767 | int skipped_disk = 0; |
6d036f7d | 5768 | sh = raid5_get_active_stripe(conf, stripe_addr+i, 0, 0, 1); |
52c03291 N |
5769 | set_bit(STRIPE_EXPANDING, &sh->state); |
5770 | atomic_inc(&conf->reshape_stripes); | |
5771 | /* If any of this stripe is beyond the end of the old | |
5772 | * array, then we need to zero those blocks | |
5773 | */ | |
5774 | for (j=sh->disks; j--;) { | |
5775 | sector_t s; | |
5776 | if (j == sh->pd_idx) | |
5777 | continue; | |
f416885e | 5778 | if (conf->level == 6 && |
d0dabf7e | 5779 | j == sh->qd_idx) |
f416885e | 5780 | continue; |
6d036f7d | 5781 | s = raid5_compute_blocknr(sh, j, 0); |
b522adcd | 5782 | if (s < raid5_size(mddev, 0, 0)) { |
a9f326eb | 5783 | skipped_disk = 1; |
52c03291 N |
5784 | continue; |
5785 | } | |
5786 | memset(page_address(sh->dev[j].page), 0, STRIPE_SIZE); | |
5787 | set_bit(R5_Expanded, &sh->dev[j].flags); | |
5788 | set_bit(R5_UPTODATE, &sh->dev[j].flags); | |
5789 | } | |
a9f326eb | 5790 | if (!skipped_disk) { |
52c03291 N |
5791 | set_bit(STRIPE_EXPAND_READY, &sh->state); |
5792 | set_bit(STRIPE_HANDLE, &sh->state); | |
5793 | } | |
ab69ae12 | 5794 | list_add(&sh->lru, &stripes); |
52c03291 N |
5795 | } |
5796 | spin_lock_irq(&conf->device_lock); | |
2c810cdd | 5797 | if (mddev->reshape_backwards) |
7a661381 | 5798 | conf->reshape_progress -= reshape_sectors * new_data_disks; |
fef9c61f | 5799 | else |
7a661381 | 5800 | conf->reshape_progress += reshape_sectors * new_data_disks; |
52c03291 N |
5801 | spin_unlock_irq(&conf->device_lock); |
5802 | /* Ok, those stripe are ready. We can start scheduling | |
5803 | * reads on the source stripes. | |
5804 | * The source stripes are determined by mapping the first and last | |
5805 | * block on the destination stripes. | |
5806 | */ | |
52c03291 | 5807 | first_sector = |
ec32a2bd | 5808 | raid5_compute_sector(conf, stripe_addr*(new_data_disks), |
911d4ee8 | 5809 | 1, &dd_idx, NULL); |
52c03291 | 5810 | last_sector = |
0e6e0271 | 5811 | raid5_compute_sector(conf, ((stripe_addr+reshape_sectors) |
09c9e5fa | 5812 | * new_data_disks - 1), |
911d4ee8 | 5813 | 1, &dd_idx, NULL); |
58c0fed4 AN |
5814 | if (last_sector >= mddev->dev_sectors) |
5815 | last_sector = mddev->dev_sectors - 1; | |
52c03291 | 5816 | while (first_sector <= last_sector) { |
6d036f7d | 5817 | sh = raid5_get_active_stripe(conf, first_sector, 1, 0, 1); |
52c03291 N |
5818 | set_bit(STRIPE_EXPAND_SOURCE, &sh->state); |
5819 | set_bit(STRIPE_HANDLE, &sh->state); | |
6d036f7d | 5820 | raid5_release_stripe(sh); |
52c03291 N |
5821 | first_sector += STRIPE_SECTORS; |
5822 | } | |
ab69ae12 N |
5823 | /* Now that the sources are clearly marked, we can release |
5824 | * the destination stripes | |
5825 | */ | |
5826 | while (!list_empty(&stripes)) { | |
5827 | sh = list_entry(stripes.next, struct stripe_head, lru); | |
5828 | list_del_init(&sh->lru); | |
6d036f7d | 5829 | raid5_release_stripe(sh); |
ab69ae12 | 5830 | } |
c6207277 N |
5831 | /* If this takes us to the resync_max point where we have to pause, |
5832 | * then we need to write out the superblock. | |
5833 | */ | |
7a661381 | 5834 | sector_nr += reshape_sectors; |
92140480 N |
5835 | retn = reshape_sectors; |
5836 | finish: | |
c5e19d90 N |
5837 | if (mddev->curr_resync_completed > mddev->resync_max || |
5838 | (sector_nr - mddev->curr_resync_completed) * 2 | |
c03f6a19 | 5839 | >= mddev->resync_max - mddev->curr_resync_completed) { |
c6207277 N |
5840 | /* Cannot proceed until we've updated the superblock... */ |
5841 | wait_event(conf->wait_for_overlap, | |
c91abf5a N |
5842 | atomic_read(&conf->reshape_stripes) == 0 |
5843 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); | |
5844 | if (atomic_read(&conf->reshape_stripes) != 0) | |
5845 | goto ret; | |
fef9c61f | 5846 | mddev->reshape_position = conf->reshape_progress; |
75d3da43 | 5847 | mddev->curr_resync_completed = sector_nr; |
c8f517c4 | 5848 | conf->reshape_checkpoint = jiffies; |
2953079c | 5849 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
c6207277 N |
5850 | md_wakeup_thread(mddev->thread); |
5851 | wait_event(mddev->sb_wait, | |
2953079c | 5852 | !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) |
c91abf5a N |
5853 | || test_bit(MD_RECOVERY_INTR, &mddev->recovery)); |
5854 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
5855 | goto ret; | |
c6207277 | 5856 | spin_lock_irq(&conf->device_lock); |
fef9c61f | 5857 | conf->reshape_safe = mddev->reshape_position; |
c6207277 N |
5858 | spin_unlock_irq(&conf->device_lock); |
5859 | wake_up(&conf->wait_for_overlap); | |
acb180b0 | 5860 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
c6207277 | 5861 | } |
c91abf5a | 5862 | ret: |
92140480 | 5863 | return retn; |
52c03291 N |
5864 | } |
5865 | ||
849674e4 SL |
5866 | static inline sector_t raid5_sync_request(struct mddev *mddev, sector_t sector_nr, |
5867 | int *skipped) | |
52c03291 | 5868 | { |
d1688a6d | 5869 | struct r5conf *conf = mddev->private; |
52c03291 | 5870 | struct stripe_head *sh; |
58c0fed4 | 5871 | sector_t max_sector = mddev->dev_sectors; |
57dab0bd | 5872 | sector_t sync_blocks; |
16a53ecc N |
5873 | int still_degraded = 0; |
5874 | int i; | |
1da177e4 | 5875 | |
72626685 | 5876 | if (sector_nr >= max_sector) { |
1da177e4 | 5877 | /* just being told to finish up .. nothing much to do */ |
cea9c228 | 5878 | |
29269553 N |
5879 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { |
5880 | end_reshape(conf); | |
5881 | return 0; | |
5882 | } | |
72626685 N |
5883 | |
5884 | if (mddev->curr_resync < max_sector) /* aborted */ | |
5885 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
5886 | &sync_blocks, 1); | |
16a53ecc | 5887 | else /* completed sync */ |
72626685 N |
5888 | conf->fullsync = 0; |
5889 | bitmap_close_sync(mddev->bitmap); | |
5890 | ||
1da177e4 LT |
5891 | return 0; |
5892 | } | |
ccfcc3c1 | 5893 | |
64bd660b N |
5894 | /* Allow raid5_quiesce to complete */ |
5895 | wait_event(conf->wait_for_overlap, conf->quiesce != 2); | |
5896 | ||
52c03291 N |
5897 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
5898 | return reshape_request(mddev, sector_nr, skipped); | |
f6705578 | 5899 | |
c6207277 N |
5900 | /* No need to check resync_max as we never do more than one |
5901 | * stripe, and as resync_max will always be on a chunk boundary, | |
5902 | * if the check in md_do_sync didn't fire, there is no chance | |
5903 | * of overstepping resync_max here | |
5904 | */ | |
5905 | ||
16a53ecc | 5906 | /* if there is too many failed drives and we are trying |
1da177e4 LT |
5907 | * to resync, then assert that we are finished, because there is |
5908 | * nothing we can do. | |
5909 | */ | |
3285edf1 | 5910 | if (mddev->degraded >= conf->max_degraded && |
16a53ecc | 5911 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
58c0fed4 | 5912 | sector_t rv = mddev->dev_sectors - sector_nr; |
57afd89f | 5913 | *skipped = 1; |
1da177e4 LT |
5914 | return rv; |
5915 | } | |
6f608040 | 5916 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
5917 | !conf->fullsync && | |
5918 | !bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && | |
5919 | sync_blocks >= STRIPE_SECTORS) { | |
72626685 N |
5920 | /* we can skip this block, and probably more */ |
5921 | sync_blocks /= STRIPE_SECTORS; | |
5922 | *skipped = 1; | |
5923 | return sync_blocks * STRIPE_SECTORS; /* keep things rounded to whole stripes */ | |
5924 | } | |
1da177e4 | 5925 | |
c40f341f | 5926 | bitmap_cond_end_sync(mddev->bitmap, sector_nr, false); |
b47490c9 | 5927 | |
6d036f7d | 5928 | sh = raid5_get_active_stripe(conf, sector_nr, 0, 1, 0); |
1da177e4 | 5929 | if (sh == NULL) { |
6d036f7d | 5930 | sh = raid5_get_active_stripe(conf, sector_nr, 0, 0, 0); |
1da177e4 | 5931 | /* make sure we don't swamp the stripe cache if someone else |
16a53ecc | 5932 | * is trying to get access |
1da177e4 | 5933 | */ |
66c006a5 | 5934 | schedule_timeout_uninterruptible(1); |
1da177e4 | 5935 | } |
16a53ecc | 5936 | /* Need to check if array will still be degraded after recovery/resync |
16d9cfab EM |
5937 | * Note in case of > 1 drive failures it's possible we're rebuilding |
5938 | * one drive while leaving another faulty drive in array. | |
16a53ecc | 5939 | */ |
16d9cfab EM |
5940 | rcu_read_lock(); |
5941 | for (i = 0; i < conf->raid_disks; i++) { | |
5942 | struct md_rdev *rdev = ACCESS_ONCE(conf->disks[i].rdev); | |
5943 | ||
5944 | if (rdev == NULL || test_bit(Faulty, &rdev->flags)) | |
16a53ecc | 5945 | still_degraded = 1; |
16d9cfab EM |
5946 | } |
5947 | rcu_read_unlock(); | |
16a53ecc N |
5948 | |
5949 | bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded); | |
5950 | ||
83206d66 | 5951 | set_bit(STRIPE_SYNC_REQUESTED, &sh->state); |
053f5b65 | 5952 | set_bit(STRIPE_HANDLE, &sh->state); |
1da177e4 | 5953 | |
6d036f7d | 5954 | raid5_release_stripe(sh); |
1da177e4 LT |
5955 | |
5956 | return STRIPE_SECTORS; | |
5957 | } | |
5958 | ||
d1688a6d | 5959 | static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio) |
46031f9a RBJ |
5960 | { |
5961 | /* We may not be able to submit a whole bio at once as there | |
5962 | * may not be enough stripe_heads available. | |
5963 | * We cannot pre-allocate enough stripe_heads as we may need | |
5964 | * more than exist in the cache (if we allow ever large chunks). | |
5965 | * So we do one stripe head at a time and record in | |
5966 | * ->bi_hw_segments how many have been done. | |
5967 | * | |
5968 | * We *know* that this entire raid_bio is in one chunk, so | |
5969 | * it will be only one 'dd_idx' and only need one call to raid5_compute_sector. | |
5970 | */ | |
5971 | struct stripe_head *sh; | |
911d4ee8 | 5972 | int dd_idx; |
46031f9a RBJ |
5973 | sector_t sector, logical_sector, last_sector; |
5974 | int scnt = 0; | |
5975 | int remaining; | |
5976 | int handled = 0; | |
5977 | ||
4f024f37 KO |
5978 | logical_sector = raid_bio->bi_iter.bi_sector & |
5979 | ~((sector_t)STRIPE_SECTORS-1); | |
112bf897 | 5980 | sector = raid5_compute_sector(conf, logical_sector, |
911d4ee8 | 5981 | 0, &dd_idx, NULL); |
f73a1c7d | 5982 | last_sector = bio_end_sector(raid_bio); |
46031f9a RBJ |
5983 | |
5984 | for (; logical_sector < last_sector; | |
387bb173 NB |
5985 | logical_sector += STRIPE_SECTORS, |
5986 | sector += STRIPE_SECTORS, | |
5987 | scnt++) { | |
46031f9a | 5988 | |
e7836bd6 | 5989 | if (scnt < raid5_bi_processed_stripes(raid_bio)) |
46031f9a RBJ |
5990 | /* already done this stripe */ |
5991 | continue; | |
5992 | ||
6d036f7d | 5993 | sh = raid5_get_active_stripe(conf, sector, 0, 1, 1); |
46031f9a RBJ |
5994 | |
5995 | if (!sh) { | |
5996 | /* failed to get a stripe - must wait */ | |
e7836bd6 | 5997 | raid5_set_bi_processed_stripes(raid_bio, scnt); |
46031f9a RBJ |
5998 | conf->retry_read_aligned = raid_bio; |
5999 | return handled; | |
6000 | } | |
6001 | ||
da41ba65 | 6002 | if (!add_stripe_bio(sh, raid_bio, dd_idx, 0, 0)) { |
6d036f7d | 6003 | raid5_release_stripe(sh); |
e7836bd6 | 6004 | raid5_set_bi_processed_stripes(raid_bio, scnt); |
387bb173 NB |
6005 | conf->retry_read_aligned = raid_bio; |
6006 | return handled; | |
6007 | } | |
6008 | ||
3f9e7c14 | 6009 | set_bit(R5_ReadNoMerge, &sh->dev[dd_idx].flags); |
36d1c647 | 6010 | handle_stripe(sh); |
6d036f7d | 6011 | raid5_release_stripe(sh); |
46031f9a RBJ |
6012 | handled++; |
6013 | } | |
e7836bd6 | 6014 | remaining = raid5_dec_bi_active_stripes(raid_bio); |
0a82a8d1 LT |
6015 | if (remaining == 0) { |
6016 | trace_block_bio_complete(bdev_get_queue(raid_bio->bi_bdev), | |
6017 | raid_bio, 0); | |
4246a0b6 | 6018 | bio_endio(raid_bio); |
0a82a8d1 | 6019 | } |
46031f9a | 6020 | if (atomic_dec_and_test(&conf->active_aligned_reads)) |
b1b46486 | 6021 | wake_up(&conf->wait_for_quiescent); |
46031f9a RBJ |
6022 | return handled; |
6023 | } | |
6024 | ||
bfc90cb0 | 6025 | static int handle_active_stripes(struct r5conf *conf, int group, |
566c09c5 SL |
6026 | struct r5worker *worker, |
6027 | struct list_head *temp_inactive_list) | |
46a06401 SL |
6028 | { |
6029 | struct stripe_head *batch[MAX_STRIPE_BATCH], *sh; | |
566c09c5 SL |
6030 | int i, batch_size = 0, hash; |
6031 | bool release_inactive = false; | |
46a06401 SL |
6032 | |
6033 | while (batch_size < MAX_STRIPE_BATCH && | |
851c30c9 | 6034 | (sh = __get_priority_stripe(conf, group)) != NULL) |
46a06401 SL |
6035 | batch[batch_size++] = sh; |
6036 | ||
566c09c5 SL |
6037 | if (batch_size == 0) { |
6038 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
6039 | if (!list_empty(temp_inactive_list + i)) | |
6040 | break; | |
a8c34f91 SL |
6041 | if (i == NR_STRIPE_HASH_LOCKS) { |
6042 | spin_unlock_irq(&conf->device_lock); | |
6043 | r5l_flush_stripe_to_raid(conf->log); | |
6044 | spin_lock_irq(&conf->device_lock); | |
566c09c5 | 6045 | return batch_size; |
a8c34f91 | 6046 | } |
566c09c5 SL |
6047 | release_inactive = true; |
6048 | } | |
46a06401 SL |
6049 | spin_unlock_irq(&conf->device_lock); |
6050 | ||
566c09c5 SL |
6051 | release_inactive_stripe_list(conf, temp_inactive_list, |
6052 | NR_STRIPE_HASH_LOCKS); | |
6053 | ||
a8c34f91 | 6054 | r5l_flush_stripe_to_raid(conf->log); |
566c09c5 SL |
6055 | if (release_inactive) { |
6056 | spin_lock_irq(&conf->device_lock); | |
6057 | return 0; | |
6058 | } | |
6059 | ||
46a06401 SL |
6060 | for (i = 0; i < batch_size; i++) |
6061 | handle_stripe(batch[i]); | |
f6bed0ef | 6062 | r5l_write_stripe_run(conf->log); |
46a06401 SL |
6063 | |
6064 | cond_resched(); | |
6065 | ||
6066 | spin_lock_irq(&conf->device_lock); | |
566c09c5 SL |
6067 | for (i = 0; i < batch_size; i++) { |
6068 | hash = batch[i]->hash_lock_index; | |
6069 | __release_stripe(conf, batch[i], &temp_inactive_list[hash]); | |
6070 | } | |
46a06401 SL |
6071 | return batch_size; |
6072 | } | |
46031f9a | 6073 | |
851c30c9 SL |
6074 | static void raid5_do_work(struct work_struct *work) |
6075 | { | |
6076 | struct r5worker *worker = container_of(work, struct r5worker, work); | |
6077 | struct r5worker_group *group = worker->group; | |
6078 | struct r5conf *conf = group->conf; | |
6079 | int group_id = group - conf->worker_groups; | |
6080 | int handled; | |
6081 | struct blk_plug plug; | |
6082 | ||
6083 | pr_debug("+++ raid5worker active\n"); | |
6084 | ||
6085 | blk_start_plug(&plug); | |
6086 | handled = 0; | |
6087 | spin_lock_irq(&conf->device_lock); | |
6088 | while (1) { | |
6089 | int batch_size, released; | |
6090 | ||
566c09c5 | 6091 | released = release_stripe_list(conf, worker->temp_inactive_list); |
851c30c9 | 6092 | |
566c09c5 SL |
6093 | batch_size = handle_active_stripes(conf, group_id, worker, |
6094 | worker->temp_inactive_list); | |
bfc90cb0 | 6095 | worker->working = false; |
851c30c9 SL |
6096 | if (!batch_size && !released) |
6097 | break; | |
6098 | handled += batch_size; | |
6099 | } | |
6100 | pr_debug("%d stripes handled\n", handled); | |
6101 | ||
6102 | spin_unlock_irq(&conf->device_lock); | |
6103 | blk_finish_plug(&plug); | |
6104 | ||
6105 | pr_debug("--- raid5worker inactive\n"); | |
6106 | } | |
6107 | ||
1da177e4 LT |
6108 | /* |
6109 | * This is our raid5 kernel thread. | |
6110 | * | |
6111 | * We scan the hash table for stripes which can be handled now. | |
6112 | * During the scan, completed stripes are saved for us by the interrupt | |
6113 | * handler, so that they will not have to wait for our next wakeup. | |
6114 | */ | |
4ed8731d | 6115 | static void raid5d(struct md_thread *thread) |
1da177e4 | 6116 | { |
4ed8731d | 6117 | struct mddev *mddev = thread->mddev; |
d1688a6d | 6118 | struct r5conf *conf = mddev->private; |
1da177e4 | 6119 | int handled; |
e1dfa0a2 | 6120 | struct blk_plug plug; |
1da177e4 | 6121 | |
45b4233c | 6122 | pr_debug("+++ raid5d active\n"); |
1da177e4 LT |
6123 | |
6124 | md_check_recovery(mddev); | |
1da177e4 | 6125 | |
c3cce6cd | 6126 | if (!bio_list_empty(&conf->return_bi) && |
2953079c | 6127 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { |
c3cce6cd N |
6128 | struct bio_list tmp = BIO_EMPTY_LIST; |
6129 | spin_lock_irq(&conf->device_lock); | |
2953079c | 6130 | if (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { |
c3cce6cd N |
6131 | bio_list_merge(&tmp, &conf->return_bi); |
6132 | bio_list_init(&conf->return_bi); | |
6133 | } | |
6134 | spin_unlock_irq(&conf->device_lock); | |
6135 | return_io(&tmp); | |
6136 | } | |
6137 | ||
e1dfa0a2 | 6138 | blk_start_plug(&plug); |
1da177e4 LT |
6139 | handled = 0; |
6140 | spin_lock_irq(&conf->device_lock); | |
6141 | while (1) { | |
46031f9a | 6142 | struct bio *bio; |
773ca82f SL |
6143 | int batch_size, released; |
6144 | ||
566c09c5 | 6145 | released = release_stripe_list(conf, conf->temp_inactive_list); |
edbe83ab N |
6146 | if (released) |
6147 | clear_bit(R5_DID_ALLOC, &conf->cache_state); | |
1da177e4 | 6148 | |
0021b7bc | 6149 | if ( |
7c13edc8 N |
6150 | !list_empty(&conf->bitmap_list)) { |
6151 | /* Now is a good time to flush some bitmap updates */ | |
6152 | conf->seq_flush++; | |
700e432d | 6153 | spin_unlock_irq(&conf->device_lock); |
72626685 | 6154 | bitmap_unplug(mddev->bitmap); |
700e432d | 6155 | spin_lock_irq(&conf->device_lock); |
7c13edc8 | 6156 | conf->seq_write = conf->seq_flush; |
566c09c5 | 6157 | activate_bit_delay(conf, conf->temp_inactive_list); |
72626685 | 6158 | } |
0021b7bc | 6159 | raid5_activate_delayed(conf); |
72626685 | 6160 | |
46031f9a RBJ |
6161 | while ((bio = remove_bio_from_retry(conf))) { |
6162 | int ok; | |
6163 | spin_unlock_irq(&conf->device_lock); | |
6164 | ok = retry_aligned_read(conf, bio); | |
6165 | spin_lock_irq(&conf->device_lock); | |
6166 | if (!ok) | |
6167 | break; | |
6168 | handled++; | |
6169 | } | |
6170 | ||
566c09c5 SL |
6171 | batch_size = handle_active_stripes(conf, ANY_GROUP, NULL, |
6172 | conf->temp_inactive_list); | |
773ca82f | 6173 | if (!batch_size && !released) |
1da177e4 | 6174 | break; |
46a06401 | 6175 | handled += batch_size; |
1da177e4 | 6176 | |
2953079c | 6177 | if (mddev->sb_flags & ~(1 << MD_SB_CHANGE_PENDING)) { |
46a06401 | 6178 | spin_unlock_irq(&conf->device_lock); |
de393cde | 6179 | md_check_recovery(mddev); |
46a06401 SL |
6180 | spin_lock_irq(&conf->device_lock); |
6181 | } | |
1da177e4 | 6182 | } |
45b4233c | 6183 | pr_debug("%d stripes handled\n", handled); |
1da177e4 LT |
6184 | |
6185 | spin_unlock_irq(&conf->device_lock); | |
2d5b569b N |
6186 | if (test_and_clear_bit(R5_ALLOC_MORE, &conf->cache_state) && |
6187 | mutex_trylock(&conf->cache_size_mutex)) { | |
edbe83ab N |
6188 | grow_one_stripe(conf, __GFP_NOWARN); |
6189 | /* Set flag even if allocation failed. This helps | |
6190 | * slow down allocation requests when mem is short | |
6191 | */ | |
6192 | set_bit(R5_DID_ALLOC, &conf->cache_state); | |
2d5b569b | 6193 | mutex_unlock(&conf->cache_size_mutex); |
edbe83ab | 6194 | } |
1da177e4 | 6195 | |
765d704d SL |
6196 | flush_deferred_bios(conf); |
6197 | ||
0576b1c6 SL |
6198 | r5l_flush_stripe_to_raid(conf->log); |
6199 | ||
c9f21aaf | 6200 | async_tx_issue_pending_all(); |
e1dfa0a2 | 6201 | blk_finish_plug(&plug); |
1da177e4 | 6202 | |
45b4233c | 6203 | pr_debug("--- raid5d inactive\n"); |
1da177e4 LT |
6204 | } |
6205 | ||
3f294f4f | 6206 | static ssize_t |
fd01b88c | 6207 | raid5_show_stripe_cache_size(struct mddev *mddev, char *page) |
3f294f4f | 6208 | { |
7b1485ba N |
6209 | struct r5conf *conf; |
6210 | int ret = 0; | |
6211 | spin_lock(&mddev->lock); | |
6212 | conf = mddev->private; | |
96de1e66 | 6213 | if (conf) |
edbe83ab | 6214 | ret = sprintf(page, "%d\n", conf->min_nr_stripes); |
7b1485ba N |
6215 | spin_unlock(&mddev->lock); |
6216 | return ret; | |
3f294f4f N |
6217 | } |
6218 | ||
c41d4ac4 | 6219 | int |
fd01b88c | 6220 | raid5_set_cache_size(struct mddev *mddev, int size) |
3f294f4f | 6221 | { |
d1688a6d | 6222 | struct r5conf *conf = mddev->private; |
b5470dc5 DW |
6223 | int err; |
6224 | ||
c41d4ac4 | 6225 | if (size <= 16 || size > 32768) |
3f294f4f | 6226 | return -EINVAL; |
486f0644 | 6227 | |
edbe83ab | 6228 | conf->min_nr_stripes = size; |
2d5b569b | 6229 | mutex_lock(&conf->cache_size_mutex); |
486f0644 N |
6230 | while (size < conf->max_nr_stripes && |
6231 | drop_one_stripe(conf)) | |
6232 | ; | |
2d5b569b | 6233 | mutex_unlock(&conf->cache_size_mutex); |
486f0644 | 6234 | |
edbe83ab | 6235 | |
b5470dc5 DW |
6236 | err = md_allow_write(mddev); |
6237 | if (err) | |
6238 | return err; | |
486f0644 | 6239 | |
2d5b569b | 6240 | mutex_lock(&conf->cache_size_mutex); |
486f0644 N |
6241 | while (size > conf->max_nr_stripes) |
6242 | if (!grow_one_stripe(conf, GFP_KERNEL)) | |
6243 | break; | |
2d5b569b | 6244 | mutex_unlock(&conf->cache_size_mutex); |
486f0644 | 6245 | |
c41d4ac4 N |
6246 | return 0; |
6247 | } | |
6248 | EXPORT_SYMBOL(raid5_set_cache_size); | |
6249 | ||
6250 | static ssize_t | |
fd01b88c | 6251 | raid5_store_stripe_cache_size(struct mddev *mddev, const char *page, size_t len) |
c41d4ac4 | 6252 | { |
6791875e | 6253 | struct r5conf *conf; |
c41d4ac4 N |
6254 | unsigned long new; |
6255 | int err; | |
6256 | ||
6257 | if (len >= PAGE_SIZE) | |
6258 | return -EINVAL; | |
b29bebd6 | 6259 | if (kstrtoul(page, 10, &new)) |
c41d4ac4 | 6260 | return -EINVAL; |
6791875e | 6261 | err = mddev_lock(mddev); |
c41d4ac4 N |
6262 | if (err) |
6263 | return err; | |
6791875e N |
6264 | conf = mddev->private; |
6265 | if (!conf) | |
6266 | err = -ENODEV; | |
6267 | else | |
6268 | err = raid5_set_cache_size(mddev, new); | |
6269 | mddev_unlock(mddev); | |
6270 | ||
6271 | return err ?: len; | |
3f294f4f | 6272 | } |
007583c9 | 6273 | |
96de1e66 N |
6274 | static struct md_sysfs_entry |
6275 | raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR, | |
6276 | raid5_show_stripe_cache_size, | |
6277 | raid5_store_stripe_cache_size); | |
3f294f4f | 6278 | |
d06f191f MS |
6279 | static ssize_t |
6280 | raid5_show_rmw_level(struct mddev *mddev, char *page) | |
6281 | { | |
6282 | struct r5conf *conf = mddev->private; | |
6283 | if (conf) | |
6284 | return sprintf(page, "%d\n", conf->rmw_level); | |
6285 | else | |
6286 | return 0; | |
6287 | } | |
6288 | ||
6289 | static ssize_t | |
6290 | raid5_store_rmw_level(struct mddev *mddev, const char *page, size_t len) | |
6291 | { | |
6292 | struct r5conf *conf = mddev->private; | |
6293 | unsigned long new; | |
6294 | ||
6295 | if (!conf) | |
6296 | return -ENODEV; | |
6297 | ||
6298 | if (len >= PAGE_SIZE) | |
6299 | return -EINVAL; | |
6300 | ||
6301 | if (kstrtoul(page, 10, &new)) | |
6302 | return -EINVAL; | |
6303 | ||
6304 | if (new != PARITY_DISABLE_RMW && !raid6_call.xor_syndrome) | |
6305 | return -EINVAL; | |
6306 | ||
6307 | if (new != PARITY_DISABLE_RMW && | |
6308 | new != PARITY_ENABLE_RMW && | |
6309 | new != PARITY_PREFER_RMW) | |
6310 | return -EINVAL; | |
6311 | ||
6312 | conf->rmw_level = new; | |
6313 | return len; | |
6314 | } | |
6315 | ||
6316 | static struct md_sysfs_entry | |
6317 | raid5_rmw_level = __ATTR(rmw_level, S_IRUGO | S_IWUSR, | |
6318 | raid5_show_rmw_level, | |
6319 | raid5_store_rmw_level); | |
6320 | ||
6321 | ||
8b3e6cdc | 6322 | static ssize_t |
fd01b88c | 6323 | raid5_show_preread_threshold(struct mddev *mddev, char *page) |
8b3e6cdc | 6324 | { |
7b1485ba N |
6325 | struct r5conf *conf; |
6326 | int ret = 0; | |
6327 | spin_lock(&mddev->lock); | |
6328 | conf = mddev->private; | |
8b3e6cdc | 6329 | if (conf) |
7b1485ba N |
6330 | ret = sprintf(page, "%d\n", conf->bypass_threshold); |
6331 | spin_unlock(&mddev->lock); | |
6332 | return ret; | |
8b3e6cdc DW |
6333 | } |
6334 | ||
6335 | static ssize_t | |
fd01b88c | 6336 | raid5_store_preread_threshold(struct mddev *mddev, const char *page, size_t len) |
8b3e6cdc | 6337 | { |
6791875e | 6338 | struct r5conf *conf; |
4ef197d8 | 6339 | unsigned long new; |
6791875e N |
6340 | int err; |
6341 | ||
8b3e6cdc DW |
6342 | if (len >= PAGE_SIZE) |
6343 | return -EINVAL; | |
b29bebd6 | 6344 | if (kstrtoul(page, 10, &new)) |
8b3e6cdc | 6345 | return -EINVAL; |
6791875e N |
6346 | |
6347 | err = mddev_lock(mddev); | |
6348 | if (err) | |
6349 | return err; | |
6350 | conf = mddev->private; | |
6351 | if (!conf) | |
6352 | err = -ENODEV; | |
edbe83ab | 6353 | else if (new > conf->min_nr_stripes) |
6791875e N |
6354 | err = -EINVAL; |
6355 | else | |
6356 | conf->bypass_threshold = new; | |
6357 | mddev_unlock(mddev); | |
6358 | return err ?: len; | |
8b3e6cdc DW |
6359 | } |
6360 | ||
6361 | static struct md_sysfs_entry | |
6362 | raid5_preread_bypass_threshold = __ATTR(preread_bypass_threshold, | |
6363 | S_IRUGO | S_IWUSR, | |
6364 | raid5_show_preread_threshold, | |
6365 | raid5_store_preread_threshold); | |
6366 | ||
d592a996 SL |
6367 | static ssize_t |
6368 | raid5_show_skip_copy(struct mddev *mddev, char *page) | |
6369 | { | |
7b1485ba N |
6370 | struct r5conf *conf; |
6371 | int ret = 0; | |
6372 | spin_lock(&mddev->lock); | |
6373 | conf = mddev->private; | |
d592a996 | 6374 | if (conf) |
7b1485ba N |
6375 | ret = sprintf(page, "%d\n", conf->skip_copy); |
6376 | spin_unlock(&mddev->lock); | |
6377 | return ret; | |
d592a996 SL |
6378 | } |
6379 | ||
6380 | static ssize_t | |
6381 | raid5_store_skip_copy(struct mddev *mddev, const char *page, size_t len) | |
6382 | { | |
6791875e | 6383 | struct r5conf *conf; |
d592a996 | 6384 | unsigned long new; |
6791875e N |
6385 | int err; |
6386 | ||
d592a996 SL |
6387 | if (len >= PAGE_SIZE) |
6388 | return -EINVAL; | |
d592a996 SL |
6389 | if (kstrtoul(page, 10, &new)) |
6390 | return -EINVAL; | |
6391 | new = !!new; | |
6791875e N |
6392 | |
6393 | err = mddev_lock(mddev); | |
6394 | if (err) | |
6395 | return err; | |
6396 | conf = mddev->private; | |
6397 | if (!conf) | |
6398 | err = -ENODEV; | |
6399 | else if (new != conf->skip_copy) { | |
6400 | mddev_suspend(mddev); | |
6401 | conf->skip_copy = new; | |
6402 | if (new) | |
6403 | mddev->queue->backing_dev_info.capabilities |= | |
6404 | BDI_CAP_STABLE_WRITES; | |
6405 | else | |
6406 | mddev->queue->backing_dev_info.capabilities &= | |
6407 | ~BDI_CAP_STABLE_WRITES; | |
6408 | mddev_resume(mddev); | |
6409 | } | |
6410 | mddev_unlock(mddev); | |
6411 | return err ?: len; | |
d592a996 SL |
6412 | } |
6413 | ||
6414 | static struct md_sysfs_entry | |
6415 | raid5_skip_copy = __ATTR(skip_copy, S_IRUGO | S_IWUSR, | |
6416 | raid5_show_skip_copy, | |
6417 | raid5_store_skip_copy); | |
6418 | ||
3f294f4f | 6419 | static ssize_t |
fd01b88c | 6420 | stripe_cache_active_show(struct mddev *mddev, char *page) |
3f294f4f | 6421 | { |
d1688a6d | 6422 | struct r5conf *conf = mddev->private; |
96de1e66 N |
6423 | if (conf) |
6424 | return sprintf(page, "%d\n", atomic_read(&conf->active_stripes)); | |
6425 | else | |
6426 | return 0; | |
3f294f4f N |
6427 | } |
6428 | ||
96de1e66 N |
6429 | static struct md_sysfs_entry |
6430 | raid5_stripecache_active = __ATTR_RO(stripe_cache_active); | |
3f294f4f | 6431 | |
b721420e SL |
6432 | static ssize_t |
6433 | raid5_show_group_thread_cnt(struct mddev *mddev, char *page) | |
6434 | { | |
7b1485ba N |
6435 | struct r5conf *conf; |
6436 | int ret = 0; | |
6437 | spin_lock(&mddev->lock); | |
6438 | conf = mddev->private; | |
b721420e | 6439 | if (conf) |
7b1485ba N |
6440 | ret = sprintf(page, "%d\n", conf->worker_cnt_per_group); |
6441 | spin_unlock(&mddev->lock); | |
6442 | return ret; | |
b721420e SL |
6443 | } |
6444 | ||
60aaf933 | 6445 | static int alloc_thread_groups(struct r5conf *conf, int cnt, |
6446 | int *group_cnt, | |
6447 | int *worker_cnt_per_group, | |
6448 | struct r5worker_group **worker_groups); | |
b721420e SL |
6449 | static ssize_t |
6450 | raid5_store_group_thread_cnt(struct mddev *mddev, const char *page, size_t len) | |
6451 | { | |
6791875e | 6452 | struct r5conf *conf; |
b721420e SL |
6453 | unsigned long new; |
6454 | int err; | |
60aaf933 | 6455 | struct r5worker_group *new_groups, *old_groups; |
6456 | int group_cnt, worker_cnt_per_group; | |
b721420e SL |
6457 | |
6458 | if (len >= PAGE_SIZE) | |
6459 | return -EINVAL; | |
b721420e SL |
6460 | if (kstrtoul(page, 10, &new)) |
6461 | return -EINVAL; | |
6462 | ||
6791875e N |
6463 | err = mddev_lock(mddev); |
6464 | if (err) | |
6465 | return err; | |
6466 | conf = mddev->private; | |
6467 | if (!conf) | |
6468 | err = -ENODEV; | |
6469 | else if (new != conf->worker_cnt_per_group) { | |
6470 | mddev_suspend(mddev); | |
b721420e | 6471 | |
6791875e N |
6472 | old_groups = conf->worker_groups; |
6473 | if (old_groups) | |
6474 | flush_workqueue(raid5_wq); | |
d206dcfa | 6475 | |
6791875e N |
6476 | err = alloc_thread_groups(conf, new, |
6477 | &group_cnt, &worker_cnt_per_group, | |
6478 | &new_groups); | |
6479 | if (!err) { | |
6480 | spin_lock_irq(&conf->device_lock); | |
6481 | conf->group_cnt = group_cnt; | |
6482 | conf->worker_cnt_per_group = worker_cnt_per_group; | |
6483 | conf->worker_groups = new_groups; | |
6484 | spin_unlock_irq(&conf->device_lock); | |
b721420e | 6485 | |
6791875e N |
6486 | if (old_groups) |
6487 | kfree(old_groups[0].workers); | |
6488 | kfree(old_groups); | |
6489 | } | |
6490 | mddev_resume(mddev); | |
b721420e | 6491 | } |
6791875e | 6492 | mddev_unlock(mddev); |
b721420e | 6493 | |
6791875e | 6494 | return err ?: len; |
b721420e SL |
6495 | } |
6496 | ||
6497 | static struct md_sysfs_entry | |
6498 | raid5_group_thread_cnt = __ATTR(group_thread_cnt, S_IRUGO | S_IWUSR, | |
6499 | raid5_show_group_thread_cnt, | |
6500 | raid5_store_group_thread_cnt); | |
6501 | ||
007583c9 | 6502 | static struct attribute *raid5_attrs[] = { |
3f294f4f N |
6503 | &raid5_stripecache_size.attr, |
6504 | &raid5_stripecache_active.attr, | |
8b3e6cdc | 6505 | &raid5_preread_bypass_threshold.attr, |
b721420e | 6506 | &raid5_group_thread_cnt.attr, |
d592a996 | 6507 | &raid5_skip_copy.attr, |
d06f191f | 6508 | &raid5_rmw_level.attr, |
2c7da14b | 6509 | &r5c_journal_mode.attr, |
3f294f4f N |
6510 | NULL, |
6511 | }; | |
007583c9 N |
6512 | static struct attribute_group raid5_attrs_group = { |
6513 | .name = NULL, | |
6514 | .attrs = raid5_attrs, | |
3f294f4f N |
6515 | }; |
6516 | ||
60aaf933 | 6517 | static int alloc_thread_groups(struct r5conf *conf, int cnt, |
6518 | int *group_cnt, | |
6519 | int *worker_cnt_per_group, | |
6520 | struct r5worker_group **worker_groups) | |
851c30c9 | 6521 | { |
566c09c5 | 6522 | int i, j, k; |
851c30c9 SL |
6523 | ssize_t size; |
6524 | struct r5worker *workers; | |
6525 | ||
60aaf933 | 6526 | *worker_cnt_per_group = cnt; |
851c30c9 | 6527 | if (cnt == 0) { |
60aaf933 | 6528 | *group_cnt = 0; |
6529 | *worker_groups = NULL; | |
851c30c9 SL |
6530 | return 0; |
6531 | } | |
60aaf933 | 6532 | *group_cnt = num_possible_nodes(); |
851c30c9 | 6533 | size = sizeof(struct r5worker) * cnt; |
60aaf933 | 6534 | workers = kzalloc(size * *group_cnt, GFP_NOIO); |
6535 | *worker_groups = kzalloc(sizeof(struct r5worker_group) * | |
6536 | *group_cnt, GFP_NOIO); | |
6537 | if (!*worker_groups || !workers) { | |
851c30c9 | 6538 | kfree(workers); |
60aaf933 | 6539 | kfree(*worker_groups); |
851c30c9 SL |
6540 | return -ENOMEM; |
6541 | } | |
6542 | ||
60aaf933 | 6543 | for (i = 0; i < *group_cnt; i++) { |
851c30c9 SL |
6544 | struct r5worker_group *group; |
6545 | ||
0c775d52 | 6546 | group = &(*worker_groups)[i]; |
851c30c9 SL |
6547 | INIT_LIST_HEAD(&group->handle_list); |
6548 | group->conf = conf; | |
6549 | group->workers = workers + i * cnt; | |
6550 | ||
6551 | for (j = 0; j < cnt; j++) { | |
566c09c5 SL |
6552 | struct r5worker *worker = group->workers + j; |
6553 | worker->group = group; | |
6554 | INIT_WORK(&worker->work, raid5_do_work); | |
6555 | ||
6556 | for (k = 0; k < NR_STRIPE_HASH_LOCKS; k++) | |
6557 | INIT_LIST_HEAD(worker->temp_inactive_list + k); | |
851c30c9 SL |
6558 | } |
6559 | } | |
6560 | ||
6561 | return 0; | |
6562 | } | |
6563 | ||
6564 | static void free_thread_groups(struct r5conf *conf) | |
6565 | { | |
6566 | if (conf->worker_groups) | |
6567 | kfree(conf->worker_groups[0].workers); | |
6568 | kfree(conf->worker_groups); | |
6569 | conf->worker_groups = NULL; | |
6570 | } | |
6571 | ||
80c3a6ce | 6572 | static sector_t |
fd01b88c | 6573 | raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce | 6574 | { |
d1688a6d | 6575 | struct r5conf *conf = mddev->private; |
80c3a6ce DW |
6576 | |
6577 | if (!sectors) | |
6578 | sectors = mddev->dev_sectors; | |
5e5e3e78 | 6579 | if (!raid_disks) |
7ec05478 | 6580 | /* size is defined by the smallest of previous and new size */ |
5e5e3e78 | 6581 | raid_disks = min(conf->raid_disks, conf->previous_raid_disks); |
80c3a6ce | 6582 | |
3cb5edf4 N |
6583 | sectors &= ~((sector_t)conf->chunk_sectors - 1); |
6584 | sectors &= ~((sector_t)conf->prev_chunk_sectors - 1); | |
80c3a6ce DW |
6585 | return sectors * (raid_disks - conf->max_degraded); |
6586 | } | |
6587 | ||
789b5e03 ON |
6588 | static void free_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu) |
6589 | { | |
6590 | safe_put_page(percpu->spare_page); | |
46d5b785 | 6591 | if (percpu->scribble) |
6592 | flex_array_free(percpu->scribble); | |
789b5e03 ON |
6593 | percpu->spare_page = NULL; |
6594 | percpu->scribble = NULL; | |
6595 | } | |
6596 | ||
6597 | static int alloc_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu) | |
6598 | { | |
6599 | if (conf->level == 6 && !percpu->spare_page) | |
6600 | percpu->spare_page = alloc_page(GFP_KERNEL); | |
6601 | if (!percpu->scribble) | |
46d5b785 | 6602 | percpu->scribble = scribble_alloc(max(conf->raid_disks, |
738a2738 N |
6603 | conf->previous_raid_disks), |
6604 | max(conf->chunk_sectors, | |
6605 | conf->prev_chunk_sectors) | |
6606 | / STRIPE_SECTORS, | |
6607 | GFP_KERNEL); | |
789b5e03 ON |
6608 | |
6609 | if (!percpu->scribble || (conf->level == 6 && !percpu->spare_page)) { | |
6610 | free_scratch_buffer(conf, percpu); | |
6611 | return -ENOMEM; | |
6612 | } | |
6613 | ||
6614 | return 0; | |
6615 | } | |
6616 | ||
29c6d1bb | 6617 | static int raid456_cpu_dead(unsigned int cpu, struct hlist_node *node) |
36d1c647 | 6618 | { |
29c6d1bb SAS |
6619 | struct r5conf *conf = hlist_entry_safe(node, struct r5conf, node); |
6620 | ||
6621 | free_scratch_buffer(conf, per_cpu_ptr(conf->percpu, cpu)); | |
6622 | return 0; | |
6623 | } | |
36d1c647 | 6624 | |
29c6d1bb SAS |
6625 | static void raid5_free_percpu(struct r5conf *conf) |
6626 | { | |
36d1c647 DW |
6627 | if (!conf->percpu) |
6628 | return; | |
6629 | ||
29c6d1bb | 6630 | cpuhp_state_remove_instance(CPUHP_MD_RAID5_PREPARE, &conf->node); |
36d1c647 DW |
6631 | free_percpu(conf->percpu); |
6632 | } | |
6633 | ||
d1688a6d | 6634 | static void free_conf(struct r5conf *conf) |
95fc17aa | 6635 | { |
d7bd398e SL |
6636 | int i; |
6637 | ||
5c7e81c3 SL |
6638 | if (conf->log) |
6639 | r5l_exit_log(conf->log); | |
30c89465 | 6640 | if (conf->shrinker.nr_deferred) |
edbe83ab | 6641 | unregister_shrinker(&conf->shrinker); |
5c7e81c3 | 6642 | |
851c30c9 | 6643 | free_thread_groups(conf); |
95fc17aa | 6644 | shrink_stripes(conf); |
36d1c647 | 6645 | raid5_free_percpu(conf); |
d7bd398e SL |
6646 | for (i = 0; i < conf->pool_size; i++) |
6647 | if (conf->disks[i].extra_page) | |
6648 | put_page(conf->disks[i].extra_page); | |
95fc17aa DW |
6649 | kfree(conf->disks); |
6650 | kfree(conf->stripe_hashtbl); | |
6651 | kfree(conf); | |
6652 | } | |
6653 | ||
29c6d1bb | 6654 | static int raid456_cpu_up_prepare(unsigned int cpu, struct hlist_node *node) |
36d1c647 | 6655 | { |
29c6d1bb | 6656 | struct r5conf *conf = hlist_entry_safe(node, struct r5conf, node); |
36d1c647 DW |
6657 | struct raid5_percpu *percpu = per_cpu_ptr(conf->percpu, cpu); |
6658 | ||
29c6d1bb | 6659 | if (alloc_scratch_buffer(conf, percpu)) { |
cc6167b4 N |
6660 | pr_warn("%s: failed memory allocation for cpu%u\n", |
6661 | __func__, cpu); | |
29c6d1bb | 6662 | return -ENOMEM; |
36d1c647 | 6663 | } |
29c6d1bb | 6664 | return 0; |
36d1c647 | 6665 | } |
36d1c647 | 6666 | |
d1688a6d | 6667 | static int raid5_alloc_percpu(struct r5conf *conf) |
36d1c647 | 6668 | { |
789b5e03 | 6669 | int err = 0; |
36d1c647 | 6670 | |
789b5e03 ON |
6671 | conf->percpu = alloc_percpu(struct raid5_percpu); |
6672 | if (!conf->percpu) | |
36d1c647 | 6673 | return -ENOMEM; |
789b5e03 | 6674 | |
29c6d1bb | 6675 | err = cpuhp_state_add_instance(CPUHP_MD_RAID5_PREPARE, &conf->node); |
27a353c0 SL |
6676 | if (!err) { |
6677 | conf->scribble_disks = max(conf->raid_disks, | |
6678 | conf->previous_raid_disks); | |
6679 | conf->scribble_sectors = max(conf->chunk_sectors, | |
6680 | conf->prev_chunk_sectors); | |
6681 | } | |
36d1c647 DW |
6682 | return err; |
6683 | } | |
6684 | ||
edbe83ab N |
6685 | static unsigned long raid5_cache_scan(struct shrinker *shrink, |
6686 | struct shrink_control *sc) | |
6687 | { | |
6688 | struct r5conf *conf = container_of(shrink, struct r5conf, shrinker); | |
2d5b569b N |
6689 | unsigned long ret = SHRINK_STOP; |
6690 | ||
6691 | if (mutex_trylock(&conf->cache_size_mutex)) { | |
6692 | ret= 0; | |
49895bcc N |
6693 | while (ret < sc->nr_to_scan && |
6694 | conf->max_nr_stripes > conf->min_nr_stripes) { | |
2d5b569b N |
6695 | if (drop_one_stripe(conf) == 0) { |
6696 | ret = SHRINK_STOP; | |
6697 | break; | |
6698 | } | |
6699 | ret++; | |
6700 | } | |
6701 | mutex_unlock(&conf->cache_size_mutex); | |
edbe83ab N |
6702 | } |
6703 | return ret; | |
6704 | } | |
6705 | ||
6706 | static unsigned long raid5_cache_count(struct shrinker *shrink, | |
6707 | struct shrink_control *sc) | |
6708 | { | |
6709 | struct r5conf *conf = container_of(shrink, struct r5conf, shrinker); | |
6710 | ||
6711 | if (conf->max_nr_stripes < conf->min_nr_stripes) | |
6712 | /* unlikely, but not impossible */ | |
6713 | return 0; | |
6714 | return conf->max_nr_stripes - conf->min_nr_stripes; | |
6715 | } | |
6716 | ||
d1688a6d | 6717 | static struct r5conf *setup_conf(struct mddev *mddev) |
1da177e4 | 6718 | { |
d1688a6d | 6719 | struct r5conf *conf; |
5e5e3e78 | 6720 | int raid_disk, memory, max_disks; |
3cb03002 | 6721 | struct md_rdev *rdev; |
1da177e4 | 6722 | struct disk_info *disk; |
0232605d | 6723 | char pers_name[6]; |
566c09c5 | 6724 | int i; |
60aaf933 | 6725 | int group_cnt, worker_cnt_per_group; |
6726 | struct r5worker_group *new_group; | |
1da177e4 | 6727 | |
91adb564 N |
6728 | if (mddev->new_level != 5 |
6729 | && mddev->new_level != 4 | |
6730 | && mddev->new_level != 6) { | |
cc6167b4 N |
6731 | pr_warn("md/raid:%s: raid level not set to 4/5/6 (%d)\n", |
6732 | mdname(mddev), mddev->new_level); | |
91adb564 | 6733 | return ERR_PTR(-EIO); |
1da177e4 | 6734 | } |
91adb564 N |
6735 | if ((mddev->new_level == 5 |
6736 | && !algorithm_valid_raid5(mddev->new_layout)) || | |
6737 | (mddev->new_level == 6 | |
6738 | && !algorithm_valid_raid6(mddev->new_layout))) { | |
cc6167b4 N |
6739 | pr_warn("md/raid:%s: layout %d not supported\n", |
6740 | mdname(mddev), mddev->new_layout); | |
91adb564 | 6741 | return ERR_PTR(-EIO); |
99c0fb5f | 6742 | } |
91adb564 | 6743 | if (mddev->new_level == 6 && mddev->raid_disks < 4) { |
cc6167b4 N |
6744 | pr_warn("md/raid:%s: not enough configured devices (%d, minimum 4)\n", |
6745 | mdname(mddev), mddev->raid_disks); | |
91adb564 | 6746 | return ERR_PTR(-EINVAL); |
4bbf3771 N |
6747 | } |
6748 | ||
664e7c41 AN |
6749 | if (!mddev->new_chunk_sectors || |
6750 | (mddev->new_chunk_sectors << 9) % PAGE_SIZE || | |
6751 | !is_power_of_2(mddev->new_chunk_sectors)) { | |
cc6167b4 N |
6752 | pr_warn("md/raid:%s: invalid chunk size %d\n", |
6753 | mdname(mddev), mddev->new_chunk_sectors << 9); | |
91adb564 | 6754 | return ERR_PTR(-EINVAL); |
f6705578 N |
6755 | } |
6756 | ||
d1688a6d | 6757 | conf = kzalloc(sizeof(struct r5conf), GFP_KERNEL); |
91adb564 | 6758 | if (conf == NULL) |
1da177e4 | 6759 | goto abort; |
851c30c9 | 6760 | /* Don't enable multi-threading by default*/ |
60aaf933 | 6761 | if (!alloc_thread_groups(conf, 0, &group_cnt, &worker_cnt_per_group, |
6762 | &new_group)) { | |
6763 | conf->group_cnt = group_cnt; | |
6764 | conf->worker_cnt_per_group = worker_cnt_per_group; | |
6765 | conf->worker_groups = new_group; | |
6766 | } else | |
851c30c9 | 6767 | goto abort; |
f5efd45a | 6768 | spin_lock_init(&conf->device_lock); |
c46501b2 | 6769 | seqcount_init(&conf->gen_lock); |
2d5b569b | 6770 | mutex_init(&conf->cache_size_mutex); |
b1b46486 | 6771 | init_waitqueue_head(&conf->wait_for_quiescent); |
6ab2a4b8 | 6772 | init_waitqueue_head(&conf->wait_for_stripe); |
f5efd45a DW |
6773 | init_waitqueue_head(&conf->wait_for_overlap); |
6774 | INIT_LIST_HEAD(&conf->handle_list); | |
6775 | INIT_LIST_HEAD(&conf->hold_list); | |
6776 | INIT_LIST_HEAD(&conf->delayed_list); | |
6777 | INIT_LIST_HEAD(&conf->bitmap_list); | |
c3cce6cd | 6778 | bio_list_init(&conf->return_bi); |
773ca82f | 6779 | init_llist_head(&conf->released_stripes); |
f5efd45a DW |
6780 | atomic_set(&conf->active_stripes, 0); |
6781 | atomic_set(&conf->preread_active_stripes, 0); | |
6782 | atomic_set(&conf->active_aligned_reads, 0); | |
765d704d SL |
6783 | bio_list_init(&conf->pending_bios); |
6784 | spin_lock_init(&conf->pending_bios_lock); | |
6785 | conf->batch_bio_dispatch = true; | |
6786 | rdev_for_each(rdev, mddev) { | |
6787 | if (test_bit(Journal, &rdev->flags)) | |
6788 | continue; | |
6789 | if (blk_queue_nonrot(bdev_get_queue(rdev->bdev))) { | |
6790 | conf->batch_bio_dispatch = false; | |
6791 | break; | |
6792 | } | |
6793 | } | |
6794 | ||
f5efd45a | 6795 | conf->bypass_threshold = BYPASS_THRESHOLD; |
d890fa2b | 6796 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
91adb564 N |
6797 | |
6798 | conf->raid_disks = mddev->raid_disks; | |
6799 | if (mddev->reshape_position == MaxSector) | |
6800 | conf->previous_raid_disks = mddev->raid_disks; | |
6801 | else | |
f6705578 | 6802 | conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks; |
5e5e3e78 | 6803 | max_disks = max(conf->raid_disks, conf->previous_raid_disks); |
f6705578 | 6804 | |
5e5e3e78 | 6805 | conf->disks = kzalloc(max_disks * sizeof(struct disk_info), |
b55e6bfc | 6806 | GFP_KERNEL); |
d7bd398e | 6807 | |
b55e6bfc N |
6808 | if (!conf->disks) |
6809 | goto abort; | |
9ffae0cf | 6810 | |
d7bd398e SL |
6811 | for (i = 0; i < max_disks; i++) { |
6812 | conf->disks[i].extra_page = alloc_page(GFP_KERNEL); | |
6813 | if (!conf->disks[i].extra_page) | |
6814 | goto abort; | |
6815 | } | |
6816 | ||
1da177e4 LT |
6817 | conf->mddev = mddev; |
6818 | ||
fccddba0 | 6819 | if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL) |
1da177e4 | 6820 | goto abort; |
1da177e4 | 6821 | |
566c09c5 SL |
6822 | /* We init hash_locks[0] separately to that it can be used |
6823 | * as the reference lock in the spin_lock_nest_lock() call | |
6824 | * in lock_all_device_hash_locks_irq in order to convince | |
6825 | * lockdep that we know what we are doing. | |
6826 | */ | |
6827 | spin_lock_init(conf->hash_locks); | |
6828 | for (i = 1; i < NR_STRIPE_HASH_LOCKS; i++) | |
6829 | spin_lock_init(conf->hash_locks + i); | |
6830 | ||
6831 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
6832 | INIT_LIST_HEAD(conf->inactive_list + i); | |
6833 | ||
6834 | for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) | |
6835 | INIT_LIST_HEAD(conf->temp_inactive_list + i); | |
6836 | ||
1e6d690b SL |
6837 | atomic_set(&conf->r5c_cached_full_stripes, 0); |
6838 | INIT_LIST_HEAD(&conf->r5c_full_stripe_list); | |
6839 | atomic_set(&conf->r5c_cached_partial_stripes, 0); | |
6840 | INIT_LIST_HEAD(&conf->r5c_partial_stripe_list); | |
e33fbb9c SL |
6841 | atomic_set(&conf->r5c_flushing_full_stripes, 0); |
6842 | atomic_set(&conf->r5c_flushing_partial_stripes, 0); | |
1e6d690b | 6843 | |
36d1c647 | 6844 | conf->level = mddev->new_level; |
46d5b785 | 6845 | conf->chunk_sectors = mddev->new_chunk_sectors; |
36d1c647 DW |
6846 | if (raid5_alloc_percpu(conf) != 0) |
6847 | goto abort; | |
6848 | ||
0c55e022 | 6849 | pr_debug("raid456: run(%s) called.\n", mdname(mddev)); |
1da177e4 | 6850 | |
dafb20fa | 6851 | rdev_for_each(rdev, mddev) { |
1da177e4 | 6852 | raid_disk = rdev->raid_disk; |
5e5e3e78 | 6853 | if (raid_disk >= max_disks |
f2076e7d | 6854 | || raid_disk < 0 || test_bit(Journal, &rdev->flags)) |
1da177e4 LT |
6855 | continue; |
6856 | disk = conf->disks + raid_disk; | |
6857 | ||
17045f52 N |
6858 | if (test_bit(Replacement, &rdev->flags)) { |
6859 | if (disk->replacement) | |
6860 | goto abort; | |
6861 | disk->replacement = rdev; | |
6862 | } else { | |
6863 | if (disk->rdev) | |
6864 | goto abort; | |
6865 | disk->rdev = rdev; | |
6866 | } | |
1da177e4 | 6867 | |
b2d444d7 | 6868 | if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 | 6869 | char b[BDEVNAME_SIZE]; |
cc6167b4 N |
6870 | pr_info("md/raid:%s: device %s operational as raid disk %d\n", |
6871 | mdname(mddev), bdevname(rdev->bdev, b), raid_disk); | |
d6b212f4 | 6872 | } else if (rdev->saved_raid_disk != raid_disk) |
8c2e870a NB |
6873 | /* Cannot rely on bitmap to complete recovery */ |
6874 | conf->fullsync = 1; | |
1da177e4 LT |
6875 | } |
6876 | ||
91adb564 | 6877 | conf->level = mddev->new_level; |
584acdd4 | 6878 | if (conf->level == 6) { |
16a53ecc | 6879 | conf->max_degraded = 2; |
584acdd4 MS |
6880 | if (raid6_call.xor_syndrome) |
6881 | conf->rmw_level = PARITY_ENABLE_RMW; | |
6882 | else | |
6883 | conf->rmw_level = PARITY_DISABLE_RMW; | |
6884 | } else { | |
16a53ecc | 6885 | conf->max_degraded = 1; |
584acdd4 MS |
6886 | conf->rmw_level = PARITY_ENABLE_RMW; |
6887 | } | |
91adb564 | 6888 | conf->algorithm = mddev->new_layout; |
fef9c61f | 6889 | conf->reshape_progress = mddev->reshape_position; |
e183eaed | 6890 | if (conf->reshape_progress != MaxSector) { |
09c9e5fa | 6891 | conf->prev_chunk_sectors = mddev->chunk_sectors; |
e183eaed | 6892 | conf->prev_algo = mddev->layout; |
5cac6bcb N |
6893 | } else { |
6894 | conf->prev_chunk_sectors = conf->chunk_sectors; | |
6895 | conf->prev_algo = conf->algorithm; | |
e183eaed | 6896 | } |
1da177e4 | 6897 | |
edbe83ab | 6898 | conf->min_nr_stripes = NR_STRIPES; |
ad5b0f76 SL |
6899 | if (mddev->reshape_position != MaxSector) { |
6900 | int stripes = max_t(int, | |
6901 | ((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4, | |
6902 | ((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4); | |
6903 | conf->min_nr_stripes = max(NR_STRIPES, stripes); | |
6904 | if (conf->min_nr_stripes != NR_STRIPES) | |
cc6167b4 | 6905 | pr_info("md/raid:%s: force stripe size %d for reshape\n", |
ad5b0f76 SL |
6906 | mdname(mddev), conf->min_nr_stripes); |
6907 | } | |
edbe83ab | 6908 | memory = conf->min_nr_stripes * (sizeof(struct stripe_head) + |
5e5e3e78 | 6909 | max_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024; |
4bda556a | 6910 | atomic_set(&conf->empty_inactive_list_nr, NR_STRIPE_HASH_LOCKS); |
edbe83ab | 6911 | if (grow_stripes(conf, conf->min_nr_stripes)) { |
cc6167b4 N |
6912 | pr_warn("md/raid:%s: couldn't allocate %dkB for buffers\n", |
6913 | mdname(mddev), memory); | |
91adb564 N |
6914 | goto abort; |
6915 | } else | |
cc6167b4 | 6916 | pr_debug("md/raid:%s: allocated %dkB\n", mdname(mddev), memory); |
edbe83ab N |
6917 | /* |
6918 | * Losing a stripe head costs more than the time to refill it, | |
6919 | * it reduces the queue depth and so can hurt throughput. | |
6920 | * So set it rather large, scaled by number of devices. | |
6921 | */ | |
6922 | conf->shrinker.seeks = DEFAULT_SEEKS * conf->raid_disks * 4; | |
6923 | conf->shrinker.scan_objects = raid5_cache_scan; | |
6924 | conf->shrinker.count_objects = raid5_cache_count; | |
6925 | conf->shrinker.batch = 128; | |
6926 | conf->shrinker.flags = 0; | |
6a0f53ff | 6927 | if (register_shrinker(&conf->shrinker)) { |
cc6167b4 N |
6928 | pr_warn("md/raid:%s: couldn't register shrinker.\n", |
6929 | mdname(mddev)); | |
6a0f53ff CY |
6930 | goto abort; |
6931 | } | |
1da177e4 | 6932 | |
0232605d N |
6933 | sprintf(pers_name, "raid%d", mddev->new_level); |
6934 | conf->thread = md_register_thread(raid5d, mddev, pers_name); | |
91adb564 | 6935 | if (!conf->thread) { |
cc6167b4 N |
6936 | pr_warn("md/raid:%s: couldn't allocate thread.\n", |
6937 | mdname(mddev)); | |
16a53ecc N |
6938 | goto abort; |
6939 | } | |
91adb564 N |
6940 | |
6941 | return conf; | |
6942 | ||
6943 | abort: | |
6944 | if (conf) { | |
95fc17aa | 6945 | free_conf(conf); |
91adb564 N |
6946 | return ERR_PTR(-EIO); |
6947 | } else | |
6948 | return ERR_PTR(-ENOMEM); | |
6949 | } | |
6950 | ||
c148ffdc N |
6951 | static int only_parity(int raid_disk, int algo, int raid_disks, int max_degraded) |
6952 | { | |
6953 | switch (algo) { | |
6954 | case ALGORITHM_PARITY_0: | |
6955 | if (raid_disk < max_degraded) | |
6956 | return 1; | |
6957 | break; | |
6958 | case ALGORITHM_PARITY_N: | |
6959 | if (raid_disk >= raid_disks - max_degraded) | |
6960 | return 1; | |
6961 | break; | |
6962 | case ALGORITHM_PARITY_0_6: | |
f72ffdd6 | 6963 | if (raid_disk == 0 || |
c148ffdc N |
6964 | raid_disk == raid_disks - 1) |
6965 | return 1; | |
6966 | break; | |
6967 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
6968 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
6969 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
6970 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
6971 | if (raid_disk == raid_disks - 1) | |
6972 | return 1; | |
6973 | } | |
6974 | return 0; | |
6975 | } | |
6976 | ||
849674e4 | 6977 | static int raid5_run(struct mddev *mddev) |
91adb564 | 6978 | { |
d1688a6d | 6979 | struct r5conf *conf; |
9f7c2220 | 6980 | int working_disks = 0; |
c148ffdc | 6981 | int dirty_parity_disks = 0; |
3cb03002 | 6982 | struct md_rdev *rdev; |
713cf5a6 | 6983 | struct md_rdev *journal_dev = NULL; |
c148ffdc | 6984 | sector_t reshape_offset = 0; |
17045f52 | 6985 | int i; |
b5254dd5 N |
6986 | long long min_offset_diff = 0; |
6987 | int first = 1; | |
91adb564 | 6988 | |
8c6ac868 | 6989 | if (mddev->recovery_cp != MaxSector) |
cc6167b4 N |
6990 | pr_notice("md/raid:%s: not clean -- starting background reconstruction\n", |
6991 | mdname(mddev)); | |
b5254dd5 N |
6992 | |
6993 | rdev_for_each(rdev, mddev) { | |
6994 | long long diff; | |
713cf5a6 | 6995 | |
f2076e7d | 6996 | if (test_bit(Journal, &rdev->flags)) { |
713cf5a6 | 6997 | journal_dev = rdev; |
f2076e7d SL |
6998 | continue; |
6999 | } | |
b5254dd5 N |
7000 | if (rdev->raid_disk < 0) |
7001 | continue; | |
7002 | diff = (rdev->new_data_offset - rdev->data_offset); | |
7003 | if (first) { | |
7004 | min_offset_diff = diff; | |
7005 | first = 0; | |
7006 | } else if (mddev->reshape_backwards && | |
7007 | diff < min_offset_diff) | |
7008 | min_offset_diff = diff; | |
7009 | else if (!mddev->reshape_backwards && | |
7010 | diff > min_offset_diff) | |
7011 | min_offset_diff = diff; | |
7012 | } | |
7013 | ||
91adb564 N |
7014 | if (mddev->reshape_position != MaxSector) { |
7015 | /* Check that we can continue the reshape. | |
b5254dd5 N |
7016 | * Difficulties arise if the stripe we would write to |
7017 | * next is at or after the stripe we would read from next. | |
7018 | * For a reshape that changes the number of devices, this | |
7019 | * is only possible for a very short time, and mdadm makes | |
7020 | * sure that time appears to have past before assembling | |
7021 | * the array. So we fail if that time hasn't passed. | |
7022 | * For a reshape that keeps the number of devices the same | |
7023 | * mdadm must be monitoring the reshape can keeping the | |
7024 | * critical areas read-only and backed up. It will start | |
7025 | * the array in read-only mode, so we check for that. | |
91adb564 N |
7026 | */ |
7027 | sector_t here_new, here_old; | |
7028 | int old_disks; | |
18b00334 | 7029 | int max_degraded = (mddev->level == 6 ? 2 : 1); |
05256d98 N |
7030 | int chunk_sectors; |
7031 | int new_data_disks; | |
91adb564 | 7032 | |
713cf5a6 | 7033 | if (journal_dev) { |
cc6167b4 N |
7034 | pr_warn("md/raid:%s: don't support reshape with journal - aborting.\n", |
7035 | mdname(mddev)); | |
713cf5a6 SL |
7036 | return -EINVAL; |
7037 | } | |
7038 | ||
88ce4930 | 7039 | if (mddev->new_level != mddev->level) { |
cc6167b4 N |
7040 | pr_warn("md/raid:%s: unsupported reshape required - aborting.\n", |
7041 | mdname(mddev)); | |
91adb564 N |
7042 | return -EINVAL; |
7043 | } | |
91adb564 N |
7044 | old_disks = mddev->raid_disks - mddev->delta_disks; |
7045 | /* reshape_position must be on a new-stripe boundary, and one | |
7046 | * further up in new geometry must map after here in old | |
7047 | * geometry. | |
05256d98 N |
7048 | * If the chunk sizes are different, then as we perform reshape |
7049 | * in units of the largest of the two, reshape_position needs | |
7050 | * be a multiple of the largest chunk size times new data disks. | |
91adb564 N |
7051 | */ |
7052 | here_new = mddev->reshape_position; | |
05256d98 N |
7053 | chunk_sectors = max(mddev->chunk_sectors, mddev->new_chunk_sectors); |
7054 | new_data_disks = mddev->raid_disks - max_degraded; | |
7055 | if (sector_div(here_new, chunk_sectors * new_data_disks)) { | |
cc6167b4 N |
7056 | pr_warn("md/raid:%s: reshape_position not on a stripe boundary\n", |
7057 | mdname(mddev)); | |
91adb564 N |
7058 | return -EINVAL; |
7059 | } | |
05256d98 | 7060 | reshape_offset = here_new * chunk_sectors; |
91adb564 N |
7061 | /* here_new is the stripe we will write to */ |
7062 | here_old = mddev->reshape_position; | |
05256d98 | 7063 | sector_div(here_old, chunk_sectors * (old_disks-max_degraded)); |
91adb564 N |
7064 | /* here_old is the first stripe that we might need to read |
7065 | * from */ | |
67ac6011 N |
7066 | if (mddev->delta_disks == 0) { |
7067 | /* We cannot be sure it is safe to start an in-place | |
b5254dd5 | 7068 | * reshape. It is only safe if user-space is monitoring |
67ac6011 N |
7069 | * and taking constant backups. |
7070 | * mdadm always starts a situation like this in | |
7071 | * readonly mode so it can take control before | |
7072 | * allowing any writes. So just check for that. | |
7073 | */ | |
b5254dd5 N |
7074 | if (abs(min_offset_diff) >= mddev->chunk_sectors && |
7075 | abs(min_offset_diff) >= mddev->new_chunk_sectors) | |
7076 | /* not really in-place - so OK */; | |
7077 | else if (mddev->ro == 0) { | |
cc6167b4 N |
7078 | pr_warn("md/raid:%s: in-place reshape must be started in read-only mode - aborting\n", |
7079 | mdname(mddev)); | |
67ac6011 N |
7080 | return -EINVAL; |
7081 | } | |
2c810cdd | 7082 | } else if (mddev->reshape_backwards |
05256d98 N |
7083 | ? (here_new * chunk_sectors + min_offset_diff <= |
7084 | here_old * chunk_sectors) | |
7085 | : (here_new * chunk_sectors >= | |
7086 | here_old * chunk_sectors + (-min_offset_diff))) { | |
91adb564 | 7087 | /* Reading from the same stripe as writing to - bad */ |
cc6167b4 N |
7088 | pr_warn("md/raid:%s: reshape_position too early for auto-recovery - aborting.\n", |
7089 | mdname(mddev)); | |
91adb564 N |
7090 | return -EINVAL; |
7091 | } | |
cc6167b4 | 7092 | pr_debug("md/raid:%s: reshape will continue\n", mdname(mddev)); |
91adb564 N |
7093 | /* OK, we should be able to continue; */ |
7094 | } else { | |
7095 | BUG_ON(mddev->level != mddev->new_level); | |
7096 | BUG_ON(mddev->layout != mddev->new_layout); | |
664e7c41 | 7097 | BUG_ON(mddev->chunk_sectors != mddev->new_chunk_sectors); |
91adb564 | 7098 | BUG_ON(mddev->delta_disks != 0); |
1da177e4 | 7099 | } |
91adb564 | 7100 | |
245f46c2 N |
7101 | if (mddev->private == NULL) |
7102 | conf = setup_conf(mddev); | |
7103 | else | |
7104 | conf = mddev->private; | |
7105 | ||
91adb564 N |
7106 | if (IS_ERR(conf)) |
7107 | return PTR_ERR(conf); | |
7108 | ||
486b0f7b SL |
7109 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { |
7110 | if (!journal_dev) { | |
cc6167b4 N |
7111 | pr_warn("md/raid:%s: journal disk is missing, force array readonly\n", |
7112 | mdname(mddev)); | |
486b0f7b SL |
7113 | mddev->ro = 1; |
7114 | set_disk_ro(mddev->gendisk, 1); | |
7115 | } else if (mddev->recovery_cp == MaxSector) | |
7116 | set_bit(MD_JOURNAL_CLEAN, &mddev->flags); | |
7dde2ad3 SL |
7117 | } |
7118 | ||
b5254dd5 | 7119 | conf->min_offset_diff = min_offset_diff; |
91adb564 N |
7120 | mddev->thread = conf->thread; |
7121 | conf->thread = NULL; | |
7122 | mddev->private = conf; | |
7123 | ||
17045f52 N |
7124 | for (i = 0; i < conf->raid_disks && conf->previous_raid_disks; |
7125 | i++) { | |
7126 | rdev = conf->disks[i].rdev; | |
7127 | if (!rdev && conf->disks[i].replacement) { | |
7128 | /* The replacement is all we have yet */ | |
7129 | rdev = conf->disks[i].replacement; | |
7130 | conf->disks[i].replacement = NULL; | |
7131 | clear_bit(Replacement, &rdev->flags); | |
7132 | conf->disks[i].rdev = rdev; | |
7133 | } | |
7134 | if (!rdev) | |
c148ffdc | 7135 | continue; |
17045f52 N |
7136 | if (conf->disks[i].replacement && |
7137 | conf->reshape_progress != MaxSector) { | |
7138 | /* replacements and reshape simply do not mix. */ | |
cc6167b4 | 7139 | pr_warn("md: cannot handle concurrent replacement and reshape.\n"); |
17045f52 N |
7140 | goto abort; |
7141 | } | |
2f115882 | 7142 | if (test_bit(In_sync, &rdev->flags)) { |
91adb564 | 7143 | working_disks++; |
2f115882 N |
7144 | continue; |
7145 | } | |
c148ffdc N |
7146 | /* This disc is not fully in-sync. However if it |
7147 | * just stored parity (beyond the recovery_offset), | |
7148 | * when we don't need to be concerned about the | |
7149 | * array being dirty. | |
7150 | * When reshape goes 'backwards', we never have | |
7151 | * partially completed devices, so we only need | |
7152 | * to worry about reshape going forwards. | |
7153 | */ | |
7154 | /* Hack because v0.91 doesn't store recovery_offset properly. */ | |
7155 | if (mddev->major_version == 0 && | |
7156 | mddev->minor_version > 90) | |
7157 | rdev->recovery_offset = reshape_offset; | |
5026d7a9 | 7158 | |
c148ffdc N |
7159 | if (rdev->recovery_offset < reshape_offset) { |
7160 | /* We need to check old and new layout */ | |
7161 | if (!only_parity(rdev->raid_disk, | |
7162 | conf->algorithm, | |
7163 | conf->raid_disks, | |
7164 | conf->max_degraded)) | |
7165 | continue; | |
7166 | } | |
7167 | if (!only_parity(rdev->raid_disk, | |
7168 | conf->prev_algo, | |
7169 | conf->previous_raid_disks, | |
7170 | conf->max_degraded)) | |
7171 | continue; | |
7172 | dirty_parity_disks++; | |
7173 | } | |
91adb564 | 7174 | |
17045f52 N |
7175 | /* |
7176 | * 0 for a fully functional array, 1 or 2 for a degraded array. | |
7177 | */ | |
2e38a37f | 7178 | mddev->degraded = raid5_calc_degraded(conf); |
91adb564 | 7179 | |
674806d6 | 7180 | if (has_failed(conf)) { |
cc6167b4 | 7181 | pr_crit("md/raid:%s: not enough operational devices (%d/%d failed)\n", |
02c2de8c | 7182 | mdname(mddev), mddev->degraded, conf->raid_disks); |
1da177e4 LT |
7183 | goto abort; |
7184 | } | |
7185 | ||
91adb564 | 7186 | /* device size must be a multiple of chunk size */ |
9d8f0363 | 7187 | mddev->dev_sectors &= ~(mddev->chunk_sectors - 1); |
91adb564 N |
7188 | mddev->resync_max_sectors = mddev->dev_sectors; |
7189 | ||
c148ffdc | 7190 | if (mddev->degraded > dirty_parity_disks && |
1da177e4 | 7191 | mddev->recovery_cp != MaxSector) { |
6ff8d8ec | 7192 | if (mddev->ok_start_degraded) |
cc6167b4 N |
7193 | pr_crit("md/raid:%s: starting dirty degraded array - data corruption possible.\n", |
7194 | mdname(mddev)); | |
6ff8d8ec | 7195 | else { |
cc6167b4 N |
7196 | pr_crit("md/raid:%s: cannot start dirty degraded array.\n", |
7197 | mdname(mddev)); | |
6ff8d8ec N |
7198 | goto abort; |
7199 | } | |
1da177e4 LT |
7200 | } |
7201 | ||
cc6167b4 N |
7202 | pr_info("md/raid:%s: raid level %d active with %d out of %d devices, algorithm %d\n", |
7203 | mdname(mddev), conf->level, | |
7204 | mddev->raid_disks-mddev->degraded, mddev->raid_disks, | |
7205 | mddev->new_layout); | |
1da177e4 LT |
7206 | |
7207 | print_raid5_conf(conf); | |
7208 | ||
fef9c61f | 7209 | if (conf->reshape_progress != MaxSector) { |
fef9c61f | 7210 | conf->reshape_safe = conf->reshape_progress; |
f6705578 N |
7211 | atomic_set(&conf->reshape_stripes, 0); |
7212 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7213 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7214 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7215 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7216 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
0da3c619 | 7217 | "reshape"); |
f6705578 N |
7218 | } |
7219 | ||
1da177e4 | 7220 | /* Ok, everything is just fine now */ |
a64c876f N |
7221 | if (mddev->to_remove == &raid5_attrs_group) |
7222 | mddev->to_remove = NULL; | |
00bcb4ac N |
7223 | else if (mddev->kobj.sd && |
7224 | sysfs_create_group(&mddev->kobj, &raid5_attrs_group)) | |
cc6167b4 N |
7225 | pr_warn("raid5: failed to create sysfs attributes for %s\n", |
7226 | mdname(mddev)); | |
4a5add49 | 7227 | md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); |
7a5febe9 | 7228 | |
4a5add49 | 7229 | if (mddev->queue) { |
9f7c2220 | 7230 | int chunk_size; |
620125f2 | 7231 | bool discard_supported = true; |
4a5add49 N |
7232 | /* read-ahead size must cover two whole stripes, which |
7233 | * is 2 * (datadisks) * chunksize where 'n' is the | |
7234 | * number of raid devices | |
7235 | */ | |
7236 | int data_disks = conf->previous_raid_disks - conf->max_degraded; | |
7237 | int stripe = data_disks * | |
7238 | ((mddev->chunk_sectors << 9) / PAGE_SIZE); | |
7239 | if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe) | |
7240 | mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
91adb564 | 7241 | |
9f7c2220 N |
7242 | chunk_size = mddev->chunk_sectors << 9; |
7243 | blk_queue_io_min(mddev->queue, chunk_size); | |
7244 | blk_queue_io_opt(mddev->queue, chunk_size * | |
7245 | (conf->raid_disks - conf->max_degraded)); | |
c78afc62 | 7246 | mddev->queue->limits.raid_partial_stripes_expensive = 1; |
620125f2 SL |
7247 | /* |
7248 | * We can only discard a whole stripe. It doesn't make sense to | |
7249 | * discard data disk but write parity disk | |
7250 | */ | |
7251 | stripe = stripe * PAGE_SIZE; | |
4ac6875e N |
7252 | /* Round up to power of 2, as discard handling |
7253 | * currently assumes that */ | |
7254 | while ((stripe-1) & stripe) | |
7255 | stripe = (stripe | (stripe-1)) + 1; | |
620125f2 SL |
7256 | mddev->queue->limits.discard_alignment = stripe; |
7257 | mddev->queue->limits.discard_granularity = stripe; | |
e8d7c332 KK |
7258 | |
7259 | /* | |
7260 | * We use 16-bit counter of active stripes in bi_phys_segments | |
7261 | * (minus one for over-loaded initialization) | |
7262 | */ | |
7263 | blk_queue_max_hw_sectors(mddev->queue, 0xfffe * STRIPE_SECTORS); | |
7264 | blk_queue_max_discard_sectors(mddev->queue, | |
7265 | 0xfffe * STRIPE_SECTORS); | |
7266 | ||
620125f2 SL |
7267 | /* |
7268 | * unaligned part of discard request will be ignored, so can't | |
8e0e99ba | 7269 | * guarantee discard_zeroes_data |
620125f2 SL |
7270 | */ |
7271 | mddev->queue->limits.discard_zeroes_data = 0; | |
8f6c2e4b | 7272 | |
5026d7a9 PA |
7273 | blk_queue_max_write_same_sectors(mddev->queue, 0); |
7274 | ||
05616be5 | 7275 | rdev_for_each(rdev, mddev) { |
9f7c2220 N |
7276 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
7277 | rdev->data_offset << 9); | |
05616be5 N |
7278 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
7279 | rdev->new_data_offset << 9); | |
620125f2 SL |
7280 | /* |
7281 | * discard_zeroes_data is required, otherwise data | |
7282 | * could be lost. Consider a scenario: discard a stripe | |
7283 | * (the stripe could be inconsistent if | |
7284 | * discard_zeroes_data is 0); write one disk of the | |
7285 | * stripe (the stripe could be inconsistent again | |
7286 | * depending on which disks are used to calculate | |
7287 | * parity); the disk is broken; The stripe data of this | |
7288 | * disk is lost. | |
7289 | */ | |
7290 | if (!blk_queue_discard(bdev_get_queue(rdev->bdev)) || | |
7291 | !bdev_get_queue(rdev->bdev)-> | |
7292 | limits.discard_zeroes_data) | |
7293 | discard_supported = false; | |
8e0e99ba N |
7294 | /* Unfortunately, discard_zeroes_data is not currently |
7295 | * a guarantee - just a hint. So we only allow DISCARD | |
7296 | * if the sysadmin has confirmed that only safe devices | |
7297 | * are in use by setting a module parameter. | |
7298 | */ | |
7299 | if (!devices_handle_discard_safely) { | |
7300 | if (discard_supported) { | |
7301 | pr_info("md/raid456: discard support disabled due to uncertainty.\n"); | |
7302 | pr_info("Set raid456.devices_handle_discard_safely=Y to override.\n"); | |
7303 | } | |
7304 | discard_supported = false; | |
7305 | } | |
05616be5 | 7306 | } |
620125f2 SL |
7307 | |
7308 | if (discard_supported && | |
e7597e69 JS |
7309 | mddev->queue->limits.max_discard_sectors >= (stripe >> 9) && |
7310 | mddev->queue->limits.discard_granularity >= stripe) | |
620125f2 SL |
7311 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, |
7312 | mddev->queue); | |
7313 | else | |
7314 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, | |
7315 | mddev->queue); | |
1dffdddd SL |
7316 | |
7317 | blk_queue_max_hw_sectors(mddev->queue, UINT_MAX); | |
9f7c2220 | 7318 | } |
23032a0e | 7319 | |
5c7e81c3 SL |
7320 | if (journal_dev) { |
7321 | char b[BDEVNAME_SIZE]; | |
7322 | ||
cc6167b4 N |
7323 | pr_debug("md/raid:%s: using device %s as journal\n", |
7324 | mdname(mddev), bdevname(journal_dev->bdev, b)); | |
5aabf7c4 SL |
7325 | if (r5l_init_log(conf, journal_dev)) |
7326 | goto abort; | |
5c7e81c3 SL |
7327 | } |
7328 | ||
1da177e4 LT |
7329 | return 0; |
7330 | abort: | |
01f96c0a | 7331 | md_unregister_thread(&mddev->thread); |
e4f869d9 N |
7332 | print_raid5_conf(conf); |
7333 | free_conf(conf); | |
1da177e4 | 7334 | mddev->private = NULL; |
cc6167b4 | 7335 | pr_warn("md/raid:%s: failed to run raid set.\n", mdname(mddev)); |
1da177e4 LT |
7336 | return -EIO; |
7337 | } | |
7338 | ||
afa0f557 | 7339 | static void raid5_free(struct mddev *mddev, void *priv) |
1da177e4 | 7340 | { |
afa0f557 | 7341 | struct r5conf *conf = priv; |
1da177e4 | 7342 | |
95fc17aa | 7343 | free_conf(conf); |
a64c876f | 7344 | mddev->to_remove = &raid5_attrs_group; |
1da177e4 LT |
7345 | } |
7346 | ||
849674e4 | 7347 | static void raid5_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 7348 | { |
d1688a6d | 7349 | struct r5conf *conf = mddev->private; |
1da177e4 LT |
7350 | int i; |
7351 | ||
9d8f0363 | 7352 | seq_printf(seq, " level %d, %dk chunk, algorithm %d", mddev->level, |
3cb5edf4 | 7353 | conf->chunk_sectors / 2, mddev->layout); |
02c2de8c | 7354 | seq_printf (seq, " [%d/%d] [", conf->raid_disks, conf->raid_disks - mddev->degraded); |
5fd13351 N |
7355 | rcu_read_lock(); |
7356 | for (i = 0; i < conf->raid_disks; i++) { | |
7357 | struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); | |
7358 | seq_printf (seq, "%s", rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); | |
7359 | } | |
7360 | rcu_read_unlock(); | |
1da177e4 | 7361 | seq_printf (seq, "]"); |
1da177e4 LT |
7362 | } |
7363 | ||
d1688a6d | 7364 | static void print_raid5_conf (struct r5conf *conf) |
1da177e4 LT |
7365 | { |
7366 | int i; | |
7367 | struct disk_info *tmp; | |
7368 | ||
cc6167b4 | 7369 | pr_debug("RAID conf printout:\n"); |
1da177e4 | 7370 | if (!conf) { |
cc6167b4 | 7371 | pr_debug("(conf==NULL)\n"); |
1da177e4 LT |
7372 | return; |
7373 | } | |
cc6167b4 | 7374 | pr_debug(" --- level:%d rd:%d wd:%d\n", conf->level, |
0c55e022 N |
7375 | conf->raid_disks, |
7376 | conf->raid_disks - conf->mddev->degraded); | |
1da177e4 LT |
7377 | |
7378 | for (i = 0; i < conf->raid_disks; i++) { | |
7379 | char b[BDEVNAME_SIZE]; | |
7380 | tmp = conf->disks + i; | |
7381 | if (tmp->rdev) | |
cc6167b4 | 7382 | pr_debug(" disk %d, o:%d, dev:%s\n", |
0c55e022 N |
7383 | i, !test_bit(Faulty, &tmp->rdev->flags), |
7384 | bdevname(tmp->rdev->bdev, b)); | |
1da177e4 LT |
7385 | } |
7386 | } | |
7387 | ||
fd01b88c | 7388 | static int raid5_spare_active(struct mddev *mddev) |
1da177e4 LT |
7389 | { |
7390 | int i; | |
d1688a6d | 7391 | struct r5conf *conf = mddev->private; |
1da177e4 | 7392 | struct disk_info *tmp; |
6b965620 N |
7393 | int count = 0; |
7394 | unsigned long flags; | |
1da177e4 LT |
7395 | |
7396 | for (i = 0; i < conf->raid_disks; i++) { | |
7397 | tmp = conf->disks + i; | |
dd054fce N |
7398 | if (tmp->replacement |
7399 | && tmp->replacement->recovery_offset == MaxSector | |
7400 | && !test_bit(Faulty, &tmp->replacement->flags) | |
7401 | && !test_and_set_bit(In_sync, &tmp->replacement->flags)) { | |
7402 | /* Replacement has just become active. */ | |
7403 | if (!tmp->rdev | |
7404 | || !test_and_clear_bit(In_sync, &tmp->rdev->flags)) | |
7405 | count++; | |
7406 | if (tmp->rdev) { | |
7407 | /* Replaced device not technically faulty, | |
7408 | * but we need to be sure it gets removed | |
7409 | * and never re-added. | |
7410 | */ | |
7411 | set_bit(Faulty, &tmp->rdev->flags); | |
7412 | sysfs_notify_dirent_safe( | |
7413 | tmp->rdev->sysfs_state); | |
7414 | } | |
7415 | sysfs_notify_dirent_safe(tmp->replacement->sysfs_state); | |
7416 | } else if (tmp->rdev | |
70fffd0b | 7417 | && tmp->rdev->recovery_offset == MaxSector |
b2d444d7 | 7418 | && !test_bit(Faulty, &tmp->rdev->flags) |
c04be0aa | 7419 | && !test_and_set_bit(In_sync, &tmp->rdev->flags)) { |
6b965620 | 7420 | count++; |
43c73ca4 | 7421 | sysfs_notify_dirent_safe(tmp->rdev->sysfs_state); |
1da177e4 LT |
7422 | } |
7423 | } | |
6b965620 | 7424 | spin_lock_irqsave(&conf->device_lock, flags); |
2e38a37f | 7425 | mddev->degraded = raid5_calc_degraded(conf); |
6b965620 | 7426 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 7427 | print_raid5_conf(conf); |
6b965620 | 7428 | return count; |
1da177e4 LT |
7429 | } |
7430 | ||
b8321b68 | 7431 | static int raid5_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 7432 | { |
d1688a6d | 7433 | struct r5conf *conf = mddev->private; |
1da177e4 | 7434 | int err = 0; |
b8321b68 | 7435 | int number = rdev->raid_disk; |
657e3e4d | 7436 | struct md_rdev **rdevp; |
1da177e4 LT |
7437 | struct disk_info *p = conf->disks + number; |
7438 | ||
7439 | print_raid5_conf(conf); | |
f6b6ec5c SL |
7440 | if (test_bit(Journal, &rdev->flags) && conf->log) { |
7441 | struct r5l_log *log; | |
c2bb6242 | 7442 | /* |
f6b6ec5c SL |
7443 | * we can't wait pending write here, as this is called in |
7444 | * raid5d, wait will deadlock. | |
c2bb6242 | 7445 | */ |
f6b6ec5c SL |
7446 | if (atomic_read(&mddev->writes_pending)) |
7447 | return -EBUSY; | |
7448 | log = conf->log; | |
7449 | conf->log = NULL; | |
7450 | synchronize_rcu(); | |
7451 | r5l_exit_log(log); | |
7452 | return 0; | |
c2bb6242 | 7453 | } |
657e3e4d N |
7454 | if (rdev == p->rdev) |
7455 | rdevp = &p->rdev; | |
7456 | else if (rdev == p->replacement) | |
7457 | rdevp = &p->replacement; | |
7458 | else | |
7459 | return 0; | |
7460 | ||
7461 | if (number >= conf->raid_disks && | |
7462 | conf->reshape_progress == MaxSector) | |
7463 | clear_bit(In_sync, &rdev->flags); | |
7464 | ||
7465 | if (test_bit(In_sync, &rdev->flags) || | |
7466 | atomic_read(&rdev->nr_pending)) { | |
7467 | err = -EBUSY; | |
7468 | goto abort; | |
7469 | } | |
7470 | /* Only remove non-faulty devices if recovery | |
7471 | * isn't possible. | |
7472 | */ | |
7473 | if (!test_bit(Faulty, &rdev->flags) && | |
7474 | mddev->recovery_disabled != conf->recovery_disabled && | |
7475 | !has_failed(conf) && | |
dd054fce | 7476 | (!p->replacement || p->replacement == rdev) && |
657e3e4d N |
7477 | number < conf->raid_disks) { |
7478 | err = -EBUSY; | |
7479 | goto abort; | |
7480 | } | |
7481 | *rdevp = NULL; | |
d787be40 N |
7482 | if (!test_bit(RemoveSynchronized, &rdev->flags)) { |
7483 | synchronize_rcu(); | |
7484 | if (atomic_read(&rdev->nr_pending)) { | |
7485 | /* lost the race, try later */ | |
7486 | err = -EBUSY; | |
7487 | *rdevp = rdev; | |
7488 | } | |
7489 | } | |
7490 | if (p->replacement) { | |
dd054fce N |
7491 | /* We must have just cleared 'rdev' */ |
7492 | p->rdev = p->replacement; | |
7493 | clear_bit(Replacement, &p->replacement->flags); | |
7494 | smp_mb(); /* Make sure other CPUs may see both as identical | |
7495 | * but will never see neither - if they are careful | |
7496 | */ | |
7497 | p->replacement = NULL; | |
7498 | clear_bit(WantReplacement, &rdev->flags); | |
7499 | } else | |
7500 | /* We might have just removed the Replacement as faulty- | |
7501 | * clear the bit just in case | |
7502 | */ | |
7503 | clear_bit(WantReplacement, &rdev->flags); | |
1da177e4 LT |
7504 | abort: |
7505 | ||
7506 | print_raid5_conf(conf); | |
7507 | return err; | |
7508 | } | |
7509 | ||
fd01b88c | 7510 | static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 7511 | { |
d1688a6d | 7512 | struct r5conf *conf = mddev->private; |
199050ea | 7513 | int err = -EEXIST; |
1da177e4 LT |
7514 | int disk; |
7515 | struct disk_info *p; | |
6c2fce2e NB |
7516 | int first = 0; |
7517 | int last = conf->raid_disks - 1; | |
1da177e4 | 7518 | |
f6b6ec5c SL |
7519 | if (test_bit(Journal, &rdev->flags)) { |
7520 | char b[BDEVNAME_SIZE]; | |
7521 | if (conf->log) | |
7522 | return -EBUSY; | |
7523 | ||
7524 | rdev->raid_disk = 0; | |
7525 | /* | |
7526 | * The array is in readonly mode if journal is missing, so no | |
7527 | * write requests running. We should be safe | |
7528 | */ | |
7529 | r5l_init_log(conf, rdev); | |
cc6167b4 N |
7530 | pr_debug("md/raid:%s: using device %s as journal\n", |
7531 | mdname(mddev), bdevname(rdev->bdev, b)); | |
f6b6ec5c SL |
7532 | return 0; |
7533 | } | |
7f0da59b N |
7534 | if (mddev->recovery_disabled == conf->recovery_disabled) |
7535 | return -EBUSY; | |
7536 | ||
dc10c643 | 7537 | if (rdev->saved_raid_disk < 0 && has_failed(conf)) |
1da177e4 | 7538 | /* no point adding a device */ |
199050ea | 7539 | return -EINVAL; |
1da177e4 | 7540 | |
6c2fce2e NB |
7541 | if (rdev->raid_disk >= 0) |
7542 | first = last = rdev->raid_disk; | |
1da177e4 LT |
7543 | |
7544 | /* | |
16a53ecc N |
7545 | * find the disk ... but prefer rdev->saved_raid_disk |
7546 | * if possible. | |
1da177e4 | 7547 | */ |
16a53ecc | 7548 | if (rdev->saved_raid_disk >= 0 && |
6c2fce2e | 7549 | rdev->saved_raid_disk >= first && |
16a53ecc | 7550 | conf->disks[rdev->saved_raid_disk].rdev == NULL) |
5cfb22a1 N |
7551 | first = rdev->saved_raid_disk; |
7552 | ||
7553 | for (disk = first; disk <= last; disk++) { | |
7bfec5f3 N |
7554 | p = conf->disks + disk; |
7555 | if (p->rdev == NULL) { | |
b2d444d7 | 7556 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 7557 | rdev->raid_disk = disk; |
199050ea | 7558 | err = 0; |
72626685 N |
7559 | if (rdev->saved_raid_disk != disk) |
7560 | conf->fullsync = 1; | |
d6065f7b | 7561 | rcu_assign_pointer(p->rdev, rdev); |
5cfb22a1 | 7562 | goto out; |
1da177e4 | 7563 | } |
5cfb22a1 N |
7564 | } |
7565 | for (disk = first; disk <= last; disk++) { | |
7566 | p = conf->disks + disk; | |
7bfec5f3 N |
7567 | if (test_bit(WantReplacement, &p->rdev->flags) && |
7568 | p->replacement == NULL) { | |
7569 | clear_bit(In_sync, &rdev->flags); | |
7570 | set_bit(Replacement, &rdev->flags); | |
7571 | rdev->raid_disk = disk; | |
7572 | err = 0; | |
7573 | conf->fullsync = 1; | |
7574 | rcu_assign_pointer(p->replacement, rdev); | |
7575 | break; | |
7576 | } | |
7577 | } | |
5cfb22a1 | 7578 | out: |
1da177e4 | 7579 | print_raid5_conf(conf); |
199050ea | 7580 | return err; |
1da177e4 LT |
7581 | } |
7582 | ||
fd01b88c | 7583 | static int raid5_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
7584 | { |
7585 | /* no resync is happening, and there is enough space | |
7586 | * on all devices, so we can resize. | |
7587 | * We need to make sure resync covers any new space. | |
7588 | * If the array is shrinking we should possibly wait until | |
7589 | * any io in the removed space completes, but it hardly seems | |
7590 | * worth it. | |
7591 | */ | |
a4a6125a | 7592 | sector_t newsize; |
3cb5edf4 N |
7593 | struct r5conf *conf = mddev->private; |
7594 | ||
713cf5a6 SL |
7595 | if (conf->log) |
7596 | return -EINVAL; | |
3cb5edf4 | 7597 | sectors &= ~((sector_t)conf->chunk_sectors - 1); |
a4a6125a N |
7598 | newsize = raid5_size(mddev, sectors, mddev->raid_disks); |
7599 | if (mddev->external_size && | |
7600 | mddev->array_sectors > newsize) | |
b522adcd | 7601 | return -EINVAL; |
a4a6125a N |
7602 | if (mddev->bitmap) { |
7603 | int ret = bitmap_resize(mddev->bitmap, sectors, 0, 0); | |
7604 | if (ret) | |
7605 | return ret; | |
7606 | } | |
7607 | md_set_array_sectors(mddev, newsize); | |
f233ea5c | 7608 | set_capacity(mddev->gendisk, mddev->array_sectors); |
449aad3e | 7609 | revalidate_disk(mddev->gendisk); |
b098636c N |
7610 | if (sectors > mddev->dev_sectors && |
7611 | mddev->recovery_cp > mddev->dev_sectors) { | |
58c0fed4 | 7612 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
7613 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
7614 | } | |
58c0fed4 | 7615 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 7616 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
7617 | return 0; |
7618 | } | |
7619 | ||
fd01b88c | 7620 | static int check_stripe_cache(struct mddev *mddev) |
01ee22b4 N |
7621 | { |
7622 | /* Can only proceed if there are plenty of stripe_heads. | |
7623 | * We need a minimum of one full stripe,, and for sensible progress | |
7624 | * it is best to have about 4 times that. | |
7625 | * If we require 4 times, then the default 256 4K stripe_heads will | |
7626 | * allow for chunk sizes up to 256K, which is probably OK. | |
7627 | * If the chunk size is greater, user-space should request more | |
7628 | * stripe_heads first. | |
7629 | */ | |
d1688a6d | 7630 | struct r5conf *conf = mddev->private; |
01ee22b4 | 7631 | if (((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4 |
edbe83ab | 7632 | > conf->min_nr_stripes || |
01ee22b4 | 7633 | ((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4 |
edbe83ab | 7634 | > conf->min_nr_stripes) { |
cc6167b4 N |
7635 | pr_warn("md/raid:%s: reshape: not enough stripes. Needed %lu\n", |
7636 | mdname(mddev), | |
7637 | ((max(mddev->chunk_sectors, mddev->new_chunk_sectors) << 9) | |
7638 | / STRIPE_SIZE)*4); | |
01ee22b4 N |
7639 | return 0; |
7640 | } | |
7641 | return 1; | |
7642 | } | |
7643 | ||
fd01b88c | 7644 | static int check_reshape(struct mddev *mddev) |
29269553 | 7645 | { |
d1688a6d | 7646 | struct r5conf *conf = mddev->private; |
29269553 | 7647 | |
713cf5a6 SL |
7648 | if (conf->log) |
7649 | return -EINVAL; | |
88ce4930 N |
7650 | if (mddev->delta_disks == 0 && |
7651 | mddev->new_layout == mddev->layout && | |
664e7c41 | 7652 | mddev->new_chunk_sectors == mddev->chunk_sectors) |
50ac168a | 7653 | return 0; /* nothing to do */ |
674806d6 | 7654 | if (has_failed(conf)) |
ec32a2bd | 7655 | return -EINVAL; |
fdcfbbb6 | 7656 | if (mddev->delta_disks < 0 && mddev->reshape_position == MaxSector) { |
ec32a2bd N |
7657 | /* We might be able to shrink, but the devices must |
7658 | * be made bigger first. | |
7659 | * For raid6, 4 is the minimum size. | |
7660 | * Otherwise 2 is the minimum | |
7661 | */ | |
7662 | int min = 2; | |
7663 | if (mddev->level == 6) | |
7664 | min = 4; | |
7665 | if (mddev->raid_disks + mddev->delta_disks < min) | |
7666 | return -EINVAL; | |
7667 | } | |
29269553 | 7668 | |
01ee22b4 | 7669 | if (!check_stripe_cache(mddev)) |
29269553 | 7670 | return -ENOSPC; |
29269553 | 7671 | |
738a2738 N |
7672 | if (mddev->new_chunk_sectors > mddev->chunk_sectors || |
7673 | mddev->delta_disks > 0) | |
7674 | if (resize_chunks(conf, | |
7675 | conf->previous_raid_disks | |
7676 | + max(0, mddev->delta_disks), | |
7677 | max(mddev->new_chunk_sectors, | |
7678 | mddev->chunk_sectors) | |
7679 | ) < 0) | |
7680 | return -ENOMEM; | |
e56108d6 N |
7681 | return resize_stripes(conf, (conf->previous_raid_disks |
7682 | + mddev->delta_disks)); | |
63c70c4f N |
7683 | } |
7684 | ||
fd01b88c | 7685 | static int raid5_start_reshape(struct mddev *mddev) |
63c70c4f | 7686 | { |
d1688a6d | 7687 | struct r5conf *conf = mddev->private; |
3cb03002 | 7688 | struct md_rdev *rdev; |
63c70c4f | 7689 | int spares = 0; |
c04be0aa | 7690 | unsigned long flags; |
63c70c4f | 7691 | |
f416885e | 7692 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
63c70c4f N |
7693 | return -EBUSY; |
7694 | ||
01ee22b4 N |
7695 | if (!check_stripe_cache(mddev)) |
7696 | return -ENOSPC; | |
7697 | ||
30b67645 N |
7698 | if (has_failed(conf)) |
7699 | return -EINVAL; | |
7700 | ||
c6563a8c | 7701 | rdev_for_each(rdev, mddev) { |
469518a3 N |
7702 | if (!test_bit(In_sync, &rdev->flags) |
7703 | && !test_bit(Faulty, &rdev->flags)) | |
29269553 | 7704 | spares++; |
c6563a8c | 7705 | } |
63c70c4f | 7706 | |
f416885e | 7707 | if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded) |
29269553 N |
7708 | /* Not enough devices even to make a degraded array |
7709 | * of that size | |
7710 | */ | |
7711 | return -EINVAL; | |
7712 | ||
ec32a2bd N |
7713 | /* Refuse to reduce size of the array. Any reductions in |
7714 | * array size must be through explicit setting of array_size | |
7715 | * attribute. | |
7716 | */ | |
7717 | if (raid5_size(mddev, 0, conf->raid_disks + mddev->delta_disks) | |
7718 | < mddev->array_sectors) { | |
cc6167b4 N |
7719 | pr_warn("md/raid:%s: array size must be reduced before number of disks\n", |
7720 | mdname(mddev)); | |
ec32a2bd N |
7721 | return -EINVAL; |
7722 | } | |
7723 | ||
f6705578 | 7724 | atomic_set(&conf->reshape_stripes, 0); |
29269553 | 7725 | spin_lock_irq(&conf->device_lock); |
c46501b2 | 7726 | write_seqcount_begin(&conf->gen_lock); |
29269553 | 7727 | conf->previous_raid_disks = conf->raid_disks; |
63c70c4f | 7728 | conf->raid_disks += mddev->delta_disks; |
09c9e5fa AN |
7729 | conf->prev_chunk_sectors = conf->chunk_sectors; |
7730 | conf->chunk_sectors = mddev->new_chunk_sectors; | |
88ce4930 N |
7731 | conf->prev_algo = conf->algorithm; |
7732 | conf->algorithm = mddev->new_layout; | |
05616be5 N |
7733 | conf->generation++; |
7734 | /* Code that selects data_offset needs to see the generation update | |
7735 | * if reshape_progress has been set - so a memory barrier needed. | |
7736 | */ | |
7737 | smp_mb(); | |
2c810cdd | 7738 | if (mddev->reshape_backwards) |
fef9c61f N |
7739 | conf->reshape_progress = raid5_size(mddev, 0, 0); |
7740 | else | |
7741 | conf->reshape_progress = 0; | |
7742 | conf->reshape_safe = conf->reshape_progress; | |
c46501b2 | 7743 | write_seqcount_end(&conf->gen_lock); |
29269553 N |
7744 | spin_unlock_irq(&conf->device_lock); |
7745 | ||
4d77e3ba N |
7746 | /* Now make sure any requests that proceeded on the assumption |
7747 | * the reshape wasn't running - like Discard or Read - have | |
7748 | * completed. | |
7749 | */ | |
7750 | mddev_suspend(mddev); | |
7751 | mddev_resume(mddev); | |
7752 | ||
29269553 N |
7753 | /* Add some new drives, as many as will fit. |
7754 | * We know there are enough to make the newly sized array work. | |
3424bf6a N |
7755 | * Don't add devices if we are reducing the number of |
7756 | * devices in the array. This is because it is not possible | |
7757 | * to correctly record the "partially reconstructed" state of | |
7758 | * such devices during the reshape and confusion could result. | |
29269553 | 7759 | */ |
87a8dec9 | 7760 | if (mddev->delta_disks >= 0) { |
dafb20fa | 7761 | rdev_for_each(rdev, mddev) |
87a8dec9 N |
7762 | if (rdev->raid_disk < 0 && |
7763 | !test_bit(Faulty, &rdev->flags)) { | |
7764 | if (raid5_add_disk(mddev, rdev) == 0) { | |
87a8dec9 | 7765 | if (rdev->raid_disk |
9d4c7d87 | 7766 | >= conf->previous_raid_disks) |
87a8dec9 | 7767 | set_bit(In_sync, &rdev->flags); |
9d4c7d87 | 7768 | else |
87a8dec9 | 7769 | rdev->recovery_offset = 0; |
36fad858 NK |
7770 | |
7771 | if (sysfs_link_rdev(mddev, rdev)) | |
87a8dec9 | 7772 | /* Failure here is OK */; |
50da0840 | 7773 | } |
87a8dec9 N |
7774 | } else if (rdev->raid_disk >= conf->previous_raid_disks |
7775 | && !test_bit(Faulty, &rdev->flags)) { | |
7776 | /* This is a spare that was manually added */ | |
7777 | set_bit(In_sync, &rdev->flags); | |
87a8dec9 | 7778 | } |
29269553 | 7779 | |
87a8dec9 N |
7780 | /* When a reshape changes the number of devices, |
7781 | * ->degraded is measured against the larger of the | |
7782 | * pre and post number of devices. | |
7783 | */ | |
ec32a2bd | 7784 | spin_lock_irqsave(&conf->device_lock, flags); |
2e38a37f | 7785 | mddev->degraded = raid5_calc_degraded(conf); |
ec32a2bd N |
7786 | spin_unlock_irqrestore(&conf->device_lock, flags); |
7787 | } | |
63c70c4f | 7788 | mddev->raid_disks = conf->raid_disks; |
e516402c | 7789 | mddev->reshape_position = conf->reshape_progress; |
2953079c | 7790 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
f6705578 | 7791 | |
29269553 N |
7792 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7793 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
ea358cd0 | 7794 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); |
29269553 N |
7795 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
7796 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7797 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
0da3c619 | 7798 | "reshape"); |
29269553 N |
7799 | if (!mddev->sync_thread) { |
7800 | mddev->recovery = 0; | |
7801 | spin_lock_irq(&conf->device_lock); | |
ba8805b9 | 7802 | write_seqcount_begin(&conf->gen_lock); |
29269553 | 7803 | mddev->raid_disks = conf->raid_disks = conf->previous_raid_disks; |
ba8805b9 N |
7804 | mddev->new_chunk_sectors = |
7805 | conf->chunk_sectors = conf->prev_chunk_sectors; | |
7806 | mddev->new_layout = conf->algorithm = conf->prev_algo; | |
05616be5 N |
7807 | rdev_for_each(rdev, mddev) |
7808 | rdev->new_data_offset = rdev->data_offset; | |
7809 | smp_wmb(); | |
ba8805b9 | 7810 | conf->generation --; |
fef9c61f | 7811 | conf->reshape_progress = MaxSector; |
1e3fa9bd | 7812 | mddev->reshape_position = MaxSector; |
ba8805b9 | 7813 | write_seqcount_end(&conf->gen_lock); |
29269553 N |
7814 | spin_unlock_irq(&conf->device_lock); |
7815 | return -EAGAIN; | |
7816 | } | |
c8f517c4 | 7817 | conf->reshape_checkpoint = jiffies; |
29269553 N |
7818 | md_wakeup_thread(mddev->sync_thread); |
7819 | md_new_event(mddev); | |
7820 | return 0; | |
7821 | } | |
29269553 | 7822 | |
ec32a2bd N |
7823 | /* This is called from the reshape thread and should make any |
7824 | * changes needed in 'conf' | |
7825 | */ | |
d1688a6d | 7826 | static void end_reshape(struct r5conf *conf) |
29269553 | 7827 | { |
29269553 | 7828 | |
f6705578 | 7829 | if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
05616be5 | 7830 | struct md_rdev *rdev; |
f6705578 | 7831 | |
f6705578 | 7832 | spin_lock_irq(&conf->device_lock); |
cea9c228 | 7833 | conf->previous_raid_disks = conf->raid_disks; |
05616be5 N |
7834 | rdev_for_each(rdev, conf->mddev) |
7835 | rdev->data_offset = rdev->new_data_offset; | |
7836 | smp_wmb(); | |
fef9c61f | 7837 | conf->reshape_progress = MaxSector; |
6cbd8148 | 7838 | conf->mddev->reshape_position = MaxSector; |
f6705578 | 7839 | spin_unlock_irq(&conf->device_lock); |
b0f9ec04 | 7840 | wake_up(&conf->wait_for_overlap); |
16a53ecc N |
7841 | |
7842 | /* read-ahead size must cover two whole stripes, which is | |
7843 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices | |
7844 | */ | |
4a5add49 | 7845 | if (conf->mddev->queue) { |
cea9c228 | 7846 | int data_disks = conf->raid_disks - conf->max_degraded; |
09c9e5fa | 7847 | int stripe = data_disks * ((conf->chunk_sectors << 9) |
cea9c228 | 7848 | / PAGE_SIZE); |
16a53ecc N |
7849 | if (conf->mddev->queue->backing_dev_info.ra_pages < 2 * stripe) |
7850 | conf->mddev->queue->backing_dev_info.ra_pages = 2 * stripe; | |
7851 | } | |
29269553 | 7852 | } |
29269553 N |
7853 | } |
7854 | ||
ec32a2bd N |
7855 | /* This is called from the raid5d thread with mddev_lock held. |
7856 | * It makes config changes to the device. | |
7857 | */ | |
fd01b88c | 7858 | static void raid5_finish_reshape(struct mddev *mddev) |
cea9c228 | 7859 | { |
d1688a6d | 7860 | struct r5conf *conf = mddev->private; |
cea9c228 N |
7861 | |
7862 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
7863 | ||
ec32a2bd N |
7864 | if (mddev->delta_disks > 0) { |
7865 | md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); | |
fe67d19a HM |
7866 | if (mddev->queue) { |
7867 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
7868 | revalidate_disk(mddev->gendisk); | |
7869 | } | |
ec32a2bd N |
7870 | } else { |
7871 | int d; | |
908f4fbd | 7872 | spin_lock_irq(&conf->device_lock); |
2e38a37f | 7873 | mddev->degraded = raid5_calc_degraded(conf); |
908f4fbd | 7874 | spin_unlock_irq(&conf->device_lock); |
ec32a2bd N |
7875 | for (d = conf->raid_disks ; |
7876 | d < conf->raid_disks - mddev->delta_disks; | |
1a67dde0 | 7877 | d++) { |
3cb03002 | 7878 | struct md_rdev *rdev = conf->disks[d].rdev; |
da7613b8 N |
7879 | if (rdev) |
7880 | clear_bit(In_sync, &rdev->flags); | |
7881 | rdev = conf->disks[d].replacement; | |
7882 | if (rdev) | |
7883 | clear_bit(In_sync, &rdev->flags); | |
1a67dde0 | 7884 | } |
cea9c228 | 7885 | } |
88ce4930 | 7886 | mddev->layout = conf->algorithm; |
09c9e5fa | 7887 | mddev->chunk_sectors = conf->chunk_sectors; |
ec32a2bd N |
7888 | mddev->reshape_position = MaxSector; |
7889 | mddev->delta_disks = 0; | |
2c810cdd | 7890 | mddev->reshape_backwards = 0; |
cea9c228 N |
7891 | } |
7892 | } | |
7893 | ||
fd01b88c | 7894 | static void raid5_quiesce(struct mddev *mddev, int state) |
72626685 | 7895 | { |
d1688a6d | 7896 | struct r5conf *conf = mddev->private; |
72626685 N |
7897 | |
7898 | switch(state) { | |
e464eafd N |
7899 | case 2: /* resume for a suspend */ |
7900 | wake_up(&conf->wait_for_overlap); | |
7901 | break; | |
7902 | ||
72626685 | 7903 | case 1: /* stop all writes */ |
566c09c5 | 7904 | lock_all_device_hash_locks_irq(conf); |
64bd660b N |
7905 | /* '2' tells resync/reshape to pause so that all |
7906 | * active stripes can drain | |
7907 | */ | |
a39f7afd | 7908 | r5c_flush_cache(conf, INT_MAX); |
64bd660b | 7909 | conf->quiesce = 2; |
b1b46486 | 7910 | wait_event_cmd(conf->wait_for_quiescent, |
46031f9a RBJ |
7911 | atomic_read(&conf->active_stripes) == 0 && |
7912 | atomic_read(&conf->active_aligned_reads) == 0, | |
566c09c5 SL |
7913 | unlock_all_device_hash_locks_irq(conf), |
7914 | lock_all_device_hash_locks_irq(conf)); | |
64bd660b | 7915 | conf->quiesce = 1; |
566c09c5 | 7916 | unlock_all_device_hash_locks_irq(conf); |
64bd660b N |
7917 | /* allow reshape to continue */ |
7918 | wake_up(&conf->wait_for_overlap); | |
72626685 N |
7919 | break; |
7920 | ||
7921 | case 0: /* re-enable writes */ | |
566c09c5 | 7922 | lock_all_device_hash_locks_irq(conf); |
72626685 | 7923 | conf->quiesce = 0; |
b1b46486 | 7924 | wake_up(&conf->wait_for_quiescent); |
e464eafd | 7925 | wake_up(&conf->wait_for_overlap); |
566c09c5 | 7926 | unlock_all_device_hash_locks_irq(conf); |
72626685 N |
7927 | break; |
7928 | } | |
e6c033f7 | 7929 | r5l_quiesce(conf->log, state); |
72626685 | 7930 | } |
b15c2e57 | 7931 | |
fd01b88c | 7932 | static void *raid45_takeover_raid0(struct mddev *mddev, int level) |
54071b38 | 7933 | { |
e373ab10 | 7934 | struct r0conf *raid0_conf = mddev->private; |
d76c8420 | 7935 | sector_t sectors; |
54071b38 | 7936 | |
f1b29bca | 7937 | /* for raid0 takeover only one zone is supported */ |
e373ab10 | 7938 | if (raid0_conf->nr_strip_zones > 1) { |
cc6167b4 N |
7939 | pr_warn("md/raid:%s: cannot takeover raid0 with more than one zone.\n", |
7940 | mdname(mddev)); | |
f1b29bca DW |
7941 | return ERR_PTR(-EINVAL); |
7942 | } | |
7943 | ||
e373ab10 N |
7944 | sectors = raid0_conf->strip_zone[0].zone_end; |
7945 | sector_div(sectors, raid0_conf->strip_zone[0].nb_dev); | |
3b71bd93 | 7946 | mddev->dev_sectors = sectors; |
f1b29bca | 7947 | mddev->new_level = level; |
54071b38 TM |
7948 | mddev->new_layout = ALGORITHM_PARITY_N; |
7949 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
7950 | mddev->raid_disks += 1; | |
7951 | mddev->delta_disks = 1; | |
7952 | /* make sure it will be not marked as dirty */ | |
7953 | mddev->recovery_cp = MaxSector; | |
7954 | ||
7955 | return setup_conf(mddev); | |
7956 | } | |
7957 | ||
fd01b88c | 7958 | static void *raid5_takeover_raid1(struct mddev *mddev) |
d562b0c4 N |
7959 | { |
7960 | int chunksect; | |
6995f0b2 | 7961 | void *ret; |
d562b0c4 N |
7962 | |
7963 | if (mddev->raid_disks != 2 || | |
7964 | mddev->degraded > 1) | |
7965 | return ERR_PTR(-EINVAL); | |
7966 | ||
7967 | /* Should check if there are write-behind devices? */ | |
7968 | ||
7969 | chunksect = 64*2; /* 64K by default */ | |
7970 | ||
7971 | /* The array must be an exact multiple of chunksize */ | |
7972 | while (chunksect && (mddev->array_sectors & (chunksect-1))) | |
7973 | chunksect >>= 1; | |
7974 | ||
7975 | if ((chunksect<<9) < STRIPE_SIZE) | |
7976 | /* array size does not allow a suitable chunk size */ | |
7977 | return ERR_PTR(-EINVAL); | |
7978 | ||
7979 | mddev->new_level = 5; | |
7980 | mddev->new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
664e7c41 | 7981 | mddev->new_chunk_sectors = chunksect; |
d562b0c4 | 7982 | |
6995f0b2 | 7983 | ret = setup_conf(mddev); |
32cd7cbb | 7984 | if (!IS_ERR(ret)) |
394ed8e4 SL |
7985 | mddev_clear_unsupported_flags(mddev, |
7986 | UNSUPPORTED_MDDEV_FLAGS); | |
6995f0b2 | 7987 | return ret; |
d562b0c4 N |
7988 | } |
7989 | ||
fd01b88c | 7990 | static void *raid5_takeover_raid6(struct mddev *mddev) |
fc9739c6 N |
7991 | { |
7992 | int new_layout; | |
7993 | ||
7994 | switch (mddev->layout) { | |
7995 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
7996 | new_layout = ALGORITHM_LEFT_ASYMMETRIC; | |
7997 | break; | |
7998 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
7999 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC; | |
8000 | break; | |
8001 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
8002 | new_layout = ALGORITHM_LEFT_SYMMETRIC; | |
8003 | break; | |
8004 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
8005 | new_layout = ALGORITHM_RIGHT_SYMMETRIC; | |
8006 | break; | |
8007 | case ALGORITHM_PARITY_0_6: | |
8008 | new_layout = ALGORITHM_PARITY_0; | |
8009 | break; | |
8010 | case ALGORITHM_PARITY_N: | |
8011 | new_layout = ALGORITHM_PARITY_N; | |
8012 | break; | |
8013 | default: | |
8014 | return ERR_PTR(-EINVAL); | |
8015 | } | |
8016 | mddev->new_level = 5; | |
8017 | mddev->new_layout = new_layout; | |
8018 | mddev->delta_disks = -1; | |
8019 | mddev->raid_disks -= 1; | |
8020 | return setup_conf(mddev); | |
8021 | } | |
8022 | ||
fd01b88c | 8023 | static int raid5_check_reshape(struct mddev *mddev) |
b3546035 | 8024 | { |
88ce4930 N |
8025 | /* For a 2-drive array, the layout and chunk size can be changed |
8026 | * immediately as not restriping is needed. | |
8027 | * For larger arrays we record the new value - after validation | |
8028 | * to be used by a reshape pass. | |
b3546035 | 8029 | */ |
d1688a6d | 8030 | struct r5conf *conf = mddev->private; |
597a711b | 8031 | int new_chunk = mddev->new_chunk_sectors; |
b3546035 | 8032 | |
597a711b | 8033 | if (mddev->new_layout >= 0 && !algorithm_valid_raid5(mddev->new_layout)) |
b3546035 N |
8034 | return -EINVAL; |
8035 | if (new_chunk > 0) { | |
0ba459d2 | 8036 | if (!is_power_of_2(new_chunk)) |
b3546035 | 8037 | return -EINVAL; |
597a711b | 8038 | if (new_chunk < (PAGE_SIZE>>9)) |
b3546035 | 8039 | return -EINVAL; |
597a711b | 8040 | if (mddev->array_sectors & (new_chunk-1)) |
b3546035 N |
8041 | /* not factor of array size */ |
8042 | return -EINVAL; | |
8043 | } | |
8044 | ||
8045 | /* They look valid */ | |
8046 | ||
88ce4930 | 8047 | if (mddev->raid_disks == 2) { |
597a711b N |
8048 | /* can make the change immediately */ |
8049 | if (mddev->new_layout >= 0) { | |
8050 | conf->algorithm = mddev->new_layout; | |
8051 | mddev->layout = mddev->new_layout; | |
88ce4930 N |
8052 | } |
8053 | if (new_chunk > 0) { | |
597a711b N |
8054 | conf->chunk_sectors = new_chunk ; |
8055 | mddev->chunk_sectors = new_chunk; | |
88ce4930 | 8056 | } |
2953079c | 8057 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
88ce4930 | 8058 | md_wakeup_thread(mddev->thread); |
b3546035 | 8059 | } |
50ac168a | 8060 | return check_reshape(mddev); |
88ce4930 N |
8061 | } |
8062 | ||
fd01b88c | 8063 | static int raid6_check_reshape(struct mddev *mddev) |
88ce4930 | 8064 | { |
597a711b | 8065 | int new_chunk = mddev->new_chunk_sectors; |
50ac168a | 8066 | |
597a711b | 8067 | if (mddev->new_layout >= 0 && !algorithm_valid_raid6(mddev->new_layout)) |
88ce4930 | 8068 | return -EINVAL; |
b3546035 | 8069 | if (new_chunk > 0) { |
0ba459d2 | 8070 | if (!is_power_of_2(new_chunk)) |
88ce4930 | 8071 | return -EINVAL; |
597a711b | 8072 | if (new_chunk < (PAGE_SIZE >> 9)) |
88ce4930 | 8073 | return -EINVAL; |
597a711b | 8074 | if (mddev->array_sectors & (new_chunk-1)) |
88ce4930 N |
8075 | /* not factor of array size */ |
8076 | return -EINVAL; | |
b3546035 | 8077 | } |
88ce4930 N |
8078 | |
8079 | /* They look valid */ | |
50ac168a | 8080 | return check_reshape(mddev); |
b3546035 N |
8081 | } |
8082 | ||
fd01b88c | 8083 | static void *raid5_takeover(struct mddev *mddev) |
d562b0c4 N |
8084 | { |
8085 | /* raid5 can take over: | |
f1b29bca | 8086 | * raid0 - if there is only one strip zone - make it a raid4 layout |
d562b0c4 N |
8087 | * raid1 - if there are two drives. We need to know the chunk size |
8088 | * raid4 - trivial - just use a raid4 layout. | |
8089 | * raid6 - Providing it is a *_6 layout | |
d562b0c4 | 8090 | */ |
f1b29bca DW |
8091 | if (mddev->level == 0) |
8092 | return raid45_takeover_raid0(mddev, 5); | |
d562b0c4 N |
8093 | if (mddev->level == 1) |
8094 | return raid5_takeover_raid1(mddev); | |
e9d4758f N |
8095 | if (mddev->level == 4) { |
8096 | mddev->new_layout = ALGORITHM_PARITY_N; | |
8097 | mddev->new_level = 5; | |
8098 | return setup_conf(mddev); | |
8099 | } | |
fc9739c6 N |
8100 | if (mddev->level == 6) |
8101 | return raid5_takeover_raid6(mddev); | |
d562b0c4 N |
8102 | |
8103 | return ERR_PTR(-EINVAL); | |
8104 | } | |
8105 | ||
fd01b88c | 8106 | static void *raid4_takeover(struct mddev *mddev) |
a78d38a1 | 8107 | { |
f1b29bca DW |
8108 | /* raid4 can take over: |
8109 | * raid0 - if there is only one strip zone | |
8110 | * raid5 - if layout is right | |
a78d38a1 | 8111 | */ |
f1b29bca DW |
8112 | if (mddev->level == 0) |
8113 | return raid45_takeover_raid0(mddev, 4); | |
a78d38a1 N |
8114 | if (mddev->level == 5 && |
8115 | mddev->layout == ALGORITHM_PARITY_N) { | |
8116 | mddev->new_layout = 0; | |
8117 | mddev->new_level = 4; | |
8118 | return setup_conf(mddev); | |
8119 | } | |
8120 | return ERR_PTR(-EINVAL); | |
8121 | } | |
d562b0c4 | 8122 | |
84fc4b56 | 8123 | static struct md_personality raid5_personality; |
245f46c2 | 8124 | |
fd01b88c | 8125 | static void *raid6_takeover(struct mddev *mddev) |
245f46c2 N |
8126 | { |
8127 | /* Currently can only take over a raid5. We map the | |
8128 | * personality to an equivalent raid6 personality | |
8129 | * with the Q block at the end. | |
8130 | */ | |
8131 | int new_layout; | |
8132 | ||
8133 | if (mddev->pers != &raid5_personality) | |
8134 | return ERR_PTR(-EINVAL); | |
8135 | if (mddev->degraded > 1) | |
8136 | return ERR_PTR(-EINVAL); | |
8137 | if (mddev->raid_disks > 253) | |
8138 | return ERR_PTR(-EINVAL); | |
8139 | if (mddev->raid_disks < 3) | |
8140 | return ERR_PTR(-EINVAL); | |
8141 | ||
8142 | switch (mddev->layout) { | |
8143 | case ALGORITHM_LEFT_ASYMMETRIC: | |
8144 | new_layout = ALGORITHM_LEFT_ASYMMETRIC_6; | |
8145 | break; | |
8146 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
8147 | new_layout = ALGORITHM_RIGHT_ASYMMETRIC_6; | |
8148 | break; | |
8149 | case ALGORITHM_LEFT_SYMMETRIC: | |
8150 | new_layout = ALGORITHM_LEFT_SYMMETRIC_6; | |
8151 | break; | |
8152 | case ALGORITHM_RIGHT_SYMMETRIC: | |
8153 | new_layout = ALGORITHM_RIGHT_SYMMETRIC_6; | |
8154 | break; | |
8155 | case ALGORITHM_PARITY_0: | |
8156 | new_layout = ALGORITHM_PARITY_0_6; | |
8157 | break; | |
8158 | case ALGORITHM_PARITY_N: | |
8159 | new_layout = ALGORITHM_PARITY_N; | |
8160 | break; | |
8161 | default: | |
8162 | return ERR_PTR(-EINVAL); | |
8163 | } | |
8164 | mddev->new_level = 6; | |
8165 | mddev->new_layout = new_layout; | |
8166 | mddev->delta_disks = 1; | |
8167 | mddev->raid_disks += 1; | |
8168 | return setup_conf(mddev); | |
8169 | } | |
8170 | ||
84fc4b56 | 8171 | static struct md_personality raid6_personality = |
16a53ecc N |
8172 | { |
8173 | .name = "raid6", | |
8174 | .level = 6, | |
8175 | .owner = THIS_MODULE, | |
849674e4 SL |
8176 | .make_request = raid5_make_request, |
8177 | .run = raid5_run, | |
afa0f557 | 8178 | .free = raid5_free, |
849674e4 SL |
8179 | .status = raid5_status, |
8180 | .error_handler = raid5_error, | |
16a53ecc N |
8181 | .hot_add_disk = raid5_add_disk, |
8182 | .hot_remove_disk= raid5_remove_disk, | |
8183 | .spare_active = raid5_spare_active, | |
849674e4 | 8184 | .sync_request = raid5_sync_request, |
16a53ecc | 8185 | .resize = raid5_resize, |
80c3a6ce | 8186 | .size = raid5_size, |
50ac168a | 8187 | .check_reshape = raid6_check_reshape, |
f416885e | 8188 | .start_reshape = raid5_start_reshape, |
cea9c228 | 8189 | .finish_reshape = raid5_finish_reshape, |
16a53ecc | 8190 | .quiesce = raid5_quiesce, |
245f46c2 | 8191 | .takeover = raid6_takeover, |
5c675f83 | 8192 | .congested = raid5_congested, |
16a53ecc | 8193 | }; |
84fc4b56 | 8194 | static struct md_personality raid5_personality = |
1da177e4 LT |
8195 | { |
8196 | .name = "raid5", | |
2604b703 | 8197 | .level = 5, |
1da177e4 | 8198 | .owner = THIS_MODULE, |
849674e4 SL |
8199 | .make_request = raid5_make_request, |
8200 | .run = raid5_run, | |
afa0f557 | 8201 | .free = raid5_free, |
849674e4 SL |
8202 | .status = raid5_status, |
8203 | .error_handler = raid5_error, | |
1da177e4 LT |
8204 | .hot_add_disk = raid5_add_disk, |
8205 | .hot_remove_disk= raid5_remove_disk, | |
8206 | .spare_active = raid5_spare_active, | |
849674e4 | 8207 | .sync_request = raid5_sync_request, |
1da177e4 | 8208 | .resize = raid5_resize, |
80c3a6ce | 8209 | .size = raid5_size, |
63c70c4f N |
8210 | .check_reshape = raid5_check_reshape, |
8211 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 8212 | .finish_reshape = raid5_finish_reshape, |
72626685 | 8213 | .quiesce = raid5_quiesce, |
d562b0c4 | 8214 | .takeover = raid5_takeover, |
5c675f83 | 8215 | .congested = raid5_congested, |
1da177e4 LT |
8216 | }; |
8217 | ||
84fc4b56 | 8218 | static struct md_personality raid4_personality = |
1da177e4 | 8219 | { |
2604b703 N |
8220 | .name = "raid4", |
8221 | .level = 4, | |
8222 | .owner = THIS_MODULE, | |
849674e4 SL |
8223 | .make_request = raid5_make_request, |
8224 | .run = raid5_run, | |
afa0f557 | 8225 | .free = raid5_free, |
849674e4 SL |
8226 | .status = raid5_status, |
8227 | .error_handler = raid5_error, | |
2604b703 N |
8228 | .hot_add_disk = raid5_add_disk, |
8229 | .hot_remove_disk= raid5_remove_disk, | |
8230 | .spare_active = raid5_spare_active, | |
849674e4 | 8231 | .sync_request = raid5_sync_request, |
2604b703 | 8232 | .resize = raid5_resize, |
80c3a6ce | 8233 | .size = raid5_size, |
3d37890b N |
8234 | .check_reshape = raid5_check_reshape, |
8235 | .start_reshape = raid5_start_reshape, | |
cea9c228 | 8236 | .finish_reshape = raid5_finish_reshape, |
2604b703 | 8237 | .quiesce = raid5_quiesce, |
a78d38a1 | 8238 | .takeover = raid4_takeover, |
5c675f83 | 8239 | .congested = raid5_congested, |
2604b703 N |
8240 | }; |
8241 | ||
8242 | static int __init raid5_init(void) | |
8243 | { | |
29c6d1bb SAS |
8244 | int ret; |
8245 | ||
851c30c9 SL |
8246 | raid5_wq = alloc_workqueue("raid5wq", |
8247 | WQ_UNBOUND|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE|WQ_SYSFS, 0); | |
8248 | if (!raid5_wq) | |
8249 | return -ENOMEM; | |
29c6d1bb SAS |
8250 | |
8251 | ret = cpuhp_setup_state_multi(CPUHP_MD_RAID5_PREPARE, | |
8252 | "md/raid5:prepare", | |
8253 | raid456_cpu_up_prepare, | |
8254 | raid456_cpu_dead); | |
8255 | if (ret) { | |
8256 | destroy_workqueue(raid5_wq); | |
8257 | return ret; | |
8258 | } | |
16a53ecc | 8259 | register_md_personality(&raid6_personality); |
2604b703 N |
8260 | register_md_personality(&raid5_personality); |
8261 | register_md_personality(&raid4_personality); | |
8262 | return 0; | |
1da177e4 LT |
8263 | } |
8264 | ||
2604b703 | 8265 | static void raid5_exit(void) |
1da177e4 | 8266 | { |
16a53ecc | 8267 | unregister_md_personality(&raid6_personality); |
2604b703 N |
8268 | unregister_md_personality(&raid5_personality); |
8269 | unregister_md_personality(&raid4_personality); | |
29c6d1bb | 8270 | cpuhp_remove_multi_state(CPUHP_MD_RAID5_PREPARE); |
851c30c9 | 8271 | destroy_workqueue(raid5_wq); |
1da177e4 LT |
8272 | } |
8273 | ||
8274 | module_init(raid5_init); | |
8275 | module_exit(raid5_exit); | |
8276 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 8277 | MODULE_DESCRIPTION("RAID4/5/6 (striping with parity) personality for MD"); |
1da177e4 | 8278 | MODULE_ALIAS("md-personality-4"); /* RAID5 */ |
d9d166c2 N |
8279 | MODULE_ALIAS("md-raid5"); |
8280 | MODULE_ALIAS("md-raid4"); | |
2604b703 N |
8281 | MODULE_ALIAS("md-level-5"); |
8282 | MODULE_ALIAS("md-level-4"); | |
16a53ecc N |
8283 | MODULE_ALIAS("md-personality-8"); /* RAID6 */ |
8284 | MODULE_ALIAS("md-raid6"); | |
8285 | MODULE_ALIAS("md-level-6"); | |
8286 | ||
8287 | /* This used to be two separate modules, they were: */ | |
8288 | MODULE_ALIAS("raid5"); | |
8289 | MODULE_ALIAS("raid6"); |